Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * USB hub driver. |
| 3 | * |
| 4 | * (C) Copyright 1999 Linus Torvalds |
| 5 | * (C) Copyright 1999 Johannes Erdfelt |
| 6 | * (C) Copyright 1999 Gregory P. Smith |
| 7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) |
| 8 | * |
| 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/completion.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/ioctl.h> |
| 20 | #include <linux/usb.h> |
| 21 | #include <linux/usbdevice_fs.h> |
Eric Lescouet | 27729aa | 2010-04-24 23:21:52 +0200 | [diff] [blame] | 22 | #include <linux/usb/hcd.h> |
Richard Zhao | 925aa46 | 2012-07-11 11:09:28 +0800 | [diff] [blame] | 23 | #include <linux/usb/otg.h> |
Phil Dibowitz | 93362a8 | 2010-07-22 00:05:01 +0200 | [diff] [blame] | 24 | #include <linux/usb/quirks.h> |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 25 | #include <linux/workqueue.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 26 | #include <linux/mutex.h> |
Theodore Ts'o | b04b315 | 2012-07-04 11:22:20 -0400 | [diff] [blame] | 27 | #include <linux/random.h> |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 28 | #include <linux/pm_qos.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/byteorder.h> |
| 32 | |
Lan Tianyu | 6e30d7c | 2013-01-11 20:10:38 +0800 | [diff] [blame] | 33 | #include "hub.h" |
Peter Chen | 026f3fc | 2014-08-19 09:51:53 +0800 | [diff] [blame] | 34 | #include "otg_whitelist.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 36 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
| 37 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 |
| 38 | |
Greg Kroah-Hartman | fa28618 | 2012-05-14 09:20:37 -0700 | [diff] [blame] | 39 | /* Protect struct usb_device->state and ->children members |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 40 | * Note: Both are also protected by ->dev.sem, except that ->state can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
| 42 | static DEFINE_SPINLOCK(device_state_lock); |
| 43 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 44 | /* workqueue to process hub events */ |
| 45 | static struct workqueue_struct *hub_wq; |
| 46 | static void hub_event(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 48 | /* synchronize hub-port add/remove and peering operations */ |
| 49 | DEFINE_MUTEX(usb_port_peer_mutex); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* cycle leds on hubs that aren't blinking for attention */ |
Saurabh Sengar | a44007a4 | 2015-10-26 09:25:36 +0530 | [diff] [blame] | 52 | static bool blinkenlights; |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 53 | module_param(blinkenlights, bool, S_IRUGO); |
| 54 | MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | /* |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 57 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about |
| 58 | * 10 seconds to send reply for the initial 64-byte descriptor request. |
| 59 | */ |
| 60 | /* define initial 64-byte descriptor request timeout in milliseconds */ |
| 61 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; |
| 62 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 63 | MODULE_PARM_DESC(initial_descriptor_timeout, |
| 64 | "initial 64-byte descriptor request timeout in milliseconds " |
| 65 | "(default 5000 - 5.0 seconds)"); |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 66 | |
| 67 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | * As of 2.6.10 we introduce a new USB device initialization scheme which |
| 69 | * closely resembles the way Windows works. Hopefully it will be compatible |
| 70 | * with a wider range of devices than the old scheme. However some previously |
| 71 | * working devices may start giving rise to "device not accepting address" |
| 72 | * errors; if that happens the user can try the old scheme by adjusting the |
| 73 | * following module parameters. |
| 74 | * |
| 75 | * For maximum flexibility there are two boolean parameters to control the |
| 76 | * hub driver's behavior. On the first initialization attempt, if the |
| 77 | * "old_scheme_first" parameter is set then the old scheme will be used, |
| 78 | * otherwise the new scheme is used. If that fails and "use_both_schemes" |
| 79 | * is set, then the driver will make another attempt, using the other scheme. |
| 80 | */ |
Saurabh Sengar | a44007a4 | 2015-10-26 09:25:36 +0530 | [diff] [blame] | 81 | static bool old_scheme_first; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
| 83 | MODULE_PARM_DESC(old_scheme_first, |
| 84 | "start with the old device initialization scheme"); |
| 85 | |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 86 | static bool use_both_schemes = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
| 88 | MODULE_PARM_DESC(use_both_schemes, |
| 89 | "try the other device initialization scheme if the " |
| 90 | "first one fails"); |
| 91 | |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 92 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
| 93 | * port reset on some companion controllers. |
| 94 | */ |
| 95 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); |
| 96 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); |
| 97 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 98 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 99 | #define HUB_DEBOUNCE_STEP 25 |
| 100 | #define HUB_DEBOUNCE_STABLE 100 |
| 101 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 102 | static void hub_release(struct kref *kref); |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 103 | static int usb_reset_and_verify_device(struct usb_device *udev); |
| 104 | |
Sarah Sharp | 131dec3 | 2010-12-06 21:00:19 -0800 | [diff] [blame] | 105 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Oliver Neukum | d64aab0 | 2016-04-20 16:28:09 +0200 | [diff] [blame] | 107 | if (hub_is_superspeedplus(hub->hdev)) |
| 108 | return "10.0 Gb/s"; |
Sarah Sharp | 131dec3 | 2010-12-06 21:00:19 -0800 | [diff] [blame] | 109 | if (hub_is_superspeed(hub->hdev)) |
| 110 | return "5.0 Gb/s"; |
Alan Stern | 288ead4 | 2010-03-04 11:32:30 -0500 | [diff] [blame] | 111 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 112 | return "480 Mb/s"; |
Alan Stern | 288ead4 | 2010-03-04 11:32:30 -0500 | [diff] [blame] | 113 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return "1.5 Mb/s"; |
| 115 | else |
| 116 | return "12 Mb/s"; |
| 117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | /* Note that hdev or one of its children must be locked! */ |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 120 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 122 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
Alan Stern | 25118084 | 2009-07-22 14:41:18 -0400 | [diff] [blame] | 123 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
| 125 | } |
| 126 | |
Lu Baolu | 2d2a316 | 2015-06-16 09:08:26 +0800 | [diff] [blame] | 127 | int usb_device_supports_lpm(struct usb_device *udev) |
Sarah Sharp | d9b2099 | 2012-02-20 08:31:26 -0800 | [diff] [blame] | 128 | { |
Alan Stern | ad87e03 | 2015-12-10 15:27:21 -0500 | [diff] [blame] | 129 | /* Some devices have trouble with LPM */ |
| 130 | if (udev->quirks & USB_QUIRK_NO_LPM) |
| 131 | return 0; |
| 132 | |
Sarah Sharp | d9b2099 | 2012-02-20 08:31:26 -0800 | [diff] [blame] | 133 | /* USB 2.1 (and greater) devices indicate LPM support through |
| 134 | * their USB 2.0 Extended Capabilities BOS descriptor. |
| 135 | */ |
Rupesh Tatiya | a842529 | 2015-04-14 16:36:55 +0530 | [diff] [blame] | 136 | if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { |
Sarah Sharp | d9b2099 | 2012-02-20 08:31:26 -0800 | [diff] [blame] | 137 | if (udev->bos->ext_cap && |
| 138 | (USB_LPM_SUPPORT & |
| 139 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) |
| 140 | return 1; |
| 141 | return 0; |
| 142 | } |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 143 | |
Sarah Sharp | 25cd288 | 2014-01-17 14:15:44 -0800 | [diff] [blame] | 144 | /* |
| 145 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. |
| 146 | * However, there are some that don't, and they set the U1/U2 exit |
| 147 | * latencies to zero. |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 148 | */ |
| 149 | if (!udev->bos->ss_cap) { |
Sarah Sharp | 25cd288 | 2014-01-17 14:15:44 -0800 | [diff] [blame] | 150 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 151 | return 0; |
| 152 | } |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 153 | |
Sarah Sharp | 25cd288 | 2014-01-17 14:15:44 -0800 | [diff] [blame] | 154 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
| 155 | udev->bos->ss_cap->bU2DevExitLat == 0) { |
| 156 | if (udev->parent) |
| 157 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); |
| 158 | else |
| 159 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | if (!udev->parent || udev->parent->lpm_capable) |
| 164 | return 1; |
Sarah Sharp | d9b2099 | 2012-02-20 08:31:26 -0800 | [diff] [blame] | 165 | return 0; |
| 166 | } |
| 167 | |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 168 | /* |
| 169 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from |
| 170 | * either U1 or U2. |
| 171 | */ |
| 172 | static void usb_set_lpm_mel(struct usb_device *udev, |
| 173 | struct usb3_lpm_parameters *udev_lpm_params, |
| 174 | unsigned int udev_exit_latency, |
| 175 | struct usb_hub *hub, |
| 176 | struct usb3_lpm_parameters *hub_lpm_params, |
| 177 | unsigned int hub_exit_latency) |
| 178 | { |
| 179 | unsigned int total_mel; |
| 180 | unsigned int device_mel; |
| 181 | unsigned int hub_mel; |
| 182 | |
| 183 | /* |
| 184 | * Calculate the time it takes to transition all links from the roothub |
| 185 | * to the parent hub into U0. The parent hub must then decode the |
| 186 | * packet (hub header decode latency) to figure out which port it was |
| 187 | * bound for. |
| 188 | * |
| 189 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 |
| 190 | * means 0.1us). Multiply that by 100 to get nanoseconds. |
| 191 | */ |
| 192 | total_mel = hub_lpm_params->mel + |
| 193 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); |
| 194 | |
| 195 | /* |
| 196 | * How long will it take to transition the downstream hub's port into |
| 197 | * U0? The greater of either the hub exit latency or the device exit |
| 198 | * latency. |
| 199 | * |
| 200 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. |
| 201 | * Multiply that by 1000 to get nanoseconds. |
| 202 | */ |
| 203 | device_mel = udev_exit_latency * 1000; |
| 204 | hub_mel = hub_exit_latency * 1000; |
| 205 | if (device_mel > hub_mel) |
| 206 | total_mel += device_mel; |
| 207 | else |
| 208 | total_mel += hub_mel; |
| 209 | |
| 210 | udev_lpm_params->mel = total_mel; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate |
| 215 | * a transition from either U1 or U2. |
| 216 | */ |
| 217 | static void usb_set_lpm_pel(struct usb_device *udev, |
| 218 | struct usb3_lpm_parameters *udev_lpm_params, |
| 219 | unsigned int udev_exit_latency, |
| 220 | struct usb_hub *hub, |
| 221 | struct usb3_lpm_parameters *hub_lpm_params, |
| 222 | unsigned int hub_exit_latency, |
| 223 | unsigned int port_to_port_exit_latency) |
| 224 | { |
| 225 | unsigned int first_link_pel; |
| 226 | unsigned int hub_pel; |
| 227 | |
| 228 | /* |
| 229 | * First, the device sends an LFPS to transition the link between the |
| 230 | * device and the parent hub into U0. The exit latency is the bigger of |
| 231 | * the device exit latency or the hub exit latency. |
| 232 | */ |
| 233 | if (udev_exit_latency > hub_exit_latency) |
| 234 | first_link_pel = udev_exit_latency * 1000; |
| 235 | else |
| 236 | first_link_pel = hub_exit_latency * 1000; |
| 237 | |
| 238 | /* |
| 239 | * When the hub starts to receive the LFPS, there is a slight delay for |
| 240 | * it to figure out that one of the ports is sending an LFPS. Then it |
| 241 | * will forward the LFPS to its upstream link. The exit latency is the |
| 242 | * delay, plus the PEL that we calculated for this hub. |
| 243 | */ |
| 244 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; |
| 245 | |
| 246 | /* |
| 247 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device |
| 248 | * is the greater of the two exit latencies. |
| 249 | */ |
| 250 | if (first_link_pel > hub_pel) |
| 251 | udev_lpm_params->pel = first_link_pel; |
| 252 | else |
| 253 | udev_lpm_params->pel = hub_pel; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from |
| 258 | * when a device initiates a transition to U0, until when it will receive the |
| 259 | * first packet from the host controller. |
| 260 | * |
| 261 | * Section C.1.5.1 describes the four components to this: |
| 262 | * - t1: device PEL |
| 263 | * - t2: time for the ERDY to make it from the device to the host. |
| 264 | * - t3: a host-specific delay to process the ERDY. |
| 265 | * - t4: time for the packet to make it from the host to the device. |
| 266 | * |
| 267 | * t3 is specific to both the xHCI host and the platform the host is integrated |
| 268 | * into. The Intel HW folks have said it's negligible, FIXME if a different |
| 269 | * vendor says otherwise. |
| 270 | */ |
| 271 | static void usb_set_lpm_sel(struct usb_device *udev, |
| 272 | struct usb3_lpm_parameters *udev_lpm_params) |
| 273 | { |
| 274 | struct usb_device *parent; |
| 275 | unsigned int num_hubs; |
| 276 | unsigned int total_sel; |
| 277 | |
| 278 | /* t1 = device PEL */ |
| 279 | total_sel = udev_lpm_params->pel; |
| 280 | /* How many external hubs are in between the device & the root port. */ |
| 281 | for (parent = udev->parent, num_hubs = 0; parent->parent; |
| 282 | parent = parent->parent) |
| 283 | num_hubs++; |
| 284 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ |
| 285 | if (num_hubs > 0) |
| 286 | total_sel += 2100 + 250 * (num_hubs - 1); |
| 287 | |
| 288 | /* t4 = 250ns * num_hubs */ |
| 289 | total_sel += 250 * num_hubs; |
| 290 | |
| 291 | udev_lpm_params->sel = total_sel; |
| 292 | } |
| 293 | |
| 294 | static void usb_set_lpm_parameters(struct usb_device *udev) |
| 295 | { |
| 296 | struct usb_hub *hub; |
| 297 | unsigned int port_to_port_delay; |
| 298 | unsigned int udev_u1_del; |
| 299 | unsigned int udev_u2_del; |
| 300 | unsigned int hub_u1_del; |
| 301 | unsigned int hub_u2_del; |
| 302 | |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 303 | if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 304 | return; |
| 305 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 306 | hub = usb_hub_to_struct_hub(udev->parent); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 307 | /* It doesn't take time to transition the roothub into U0, since it |
| 308 | * doesn't have an upstream link. |
| 309 | */ |
| 310 | if (!hub) |
| 311 | return; |
| 312 | |
| 313 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; |
Xenia Ragiadakou | 4d96799 | 2013-08-31 18:09:13 +0300 | [diff] [blame] | 314 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 315 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
Xenia Ragiadakou | 4d96799 | 2013-08-31 18:09:13 +0300 | [diff] [blame] | 316 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 317 | |
| 318 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, |
| 319 | hub, &udev->parent->u1_params, hub_u1_del); |
| 320 | |
| 321 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, |
| 322 | hub, &udev->parent->u2_params, hub_u2_del); |
| 323 | |
| 324 | /* |
| 325 | * Appendix C, section C.2.2.2, says that there is a slight delay from |
| 326 | * when the parent hub notices the downstream port is trying to |
| 327 | * transition to U0 to when the hub initiates a U0 transition on its |
| 328 | * upstream port. The section says the delays are tPort2PortU1EL and |
| 329 | * tPort2PortU2EL, but it doesn't define what they are. |
| 330 | * |
| 331 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking |
| 332 | * about the same delays. Use the maximum delay calculations from those |
| 333 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For |
| 334 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I |
| 335 | * assume the device exit latencies they are talking about are the hub |
| 336 | * exit latencies. |
| 337 | * |
| 338 | * What do we do if the U2 exit latency is less than the U1 exit |
| 339 | * latency? It's possible, although not likely... |
| 340 | */ |
| 341 | port_to_port_delay = 1; |
| 342 | |
| 343 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, |
| 344 | hub, &udev->parent->u1_params, hub_u1_del, |
| 345 | port_to_port_delay); |
| 346 | |
| 347 | if (hub_u2_del > hub_u1_del) |
| 348 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; |
| 349 | else |
| 350 | port_to_port_delay = 1 + hub_u1_del; |
| 351 | |
| 352 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, |
| 353 | hub, &udev->parent->u2_params, hub_u2_del, |
| 354 | port_to_port_delay); |
| 355 | |
| 356 | /* Now that we've got PEL, calculate SEL. */ |
| 357 | usb_set_lpm_sel(udev, &udev->u1_params); |
| 358 | usb_set_lpm_sel(udev, &udev->u2_params); |
| 359 | } |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | /* USB 2.0 spec Section 11.24.4.5 */ |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 362 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 364 | int i, ret, size; |
| 365 | unsigned dtype; |
| 366 | |
| 367 | if (hub_is_superspeed(hdev)) { |
| 368 | dtype = USB_DT_SS_HUB; |
| 369 | size = USB_DT_SS_HUB_SIZE; |
| 370 | } else { |
| 371 | dtype = USB_DT_HUB; |
| 372 | size = sizeof(struct usb_hub_descriptor); |
| 373 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | for (i = 0; i < 3; i++) { |
| 376 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 377 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 378 | dtype << 8, 0, data, size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | USB_CTRL_GET_TIMEOUT); |
| 380 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) |
| 381 | return ret; |
| 382 | } |
| 383 | return -EINVAL; |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * USB 2.0 spec Section 11.24.2.1 |
| 388 | */ |
| 389 | static int clear_hub_feature(struct usb_device *hdev, int feature) |
| 390 | { |
| 391 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 392 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * USB 2.0 spec Section 11.24.2.2 |
| 397 | */ |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 398 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
| 400 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 401 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
| 402 | NULL, 0, 1000); |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * USB 2.0 spec Section 11.24.2.13 |
| 407 | */ |
| 408 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
| 409 | { |
| 410 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 411 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
| 412 | NULL, 0, 1000); |
| 413 | } |
| 414 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 415 | static char *to_led_name(int selector) |
| 416 | { |
| 417 | switch (selector) { |
| 418 | case HUB_LED_AMBER: |
| 419 | return "amber"; |
| 420 | case HUB_LED_GREEN: |
| 421 | return "green"; |
| 422 | case HUB_LED_OFF: |
| 423 | return "off"; |
| 424 | case HUB_LED_AUTO: |
| 425 | return "auto"; |
| 426 | default: |
| 427 | return "??"; |
| 428 | } |
| 429 | } |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* |
| 432 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
| 433 | * for info about using port indicators |
| 434 | */ |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 435 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 437 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 438 | int status; |
| 439 | |
| 440 | status = set_port_feature(hub->hdev, (selector << 8) | port1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | USB_PORT_FEAT_INDICATOR); |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 442 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
| 443 | to_led_name(selector), status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | #define LED_CYCLE_PERIOD ((2*HZ)/3) |
| 447 | |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 448 | static void led_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 450 | struct usb_hub *hub = |
| 451 | container_of(work, struct usb_hub, leds.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | struct usb_device *hdev = hub->hdev; |
| 453 | unsigned i; |
| 454 | unsigned changed = 0; |
| 455 | int cursor = -1; |
| 456 | |
| 457 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
| 458 | return; |
| 459 | |
Krzysztof Mazur | 3bbc47d | 2013-08-22 14:49:40 +0200 | [diff] [blame] | 460 | for (i = 0; i < hdev->maxchild; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | unsigned selector, mode; |
| 462 | |
| 463 | /* 30%-50% duty cycle */ |
| 464 | |
| 465 | switch (hub->indicator[i]) { |
| 466 | /* cycle marker */ |
| 467 | case INDICATOR_CYCLE: |
| 468 | cursor = i; |
| 469 | selector = HUB_LED_AUTO; |
| 470 | mode = INDICATOR_AUTO; |
| 471 | break; |
| 472 | /* blinking green = sw attention */ |
| 473 | case INDICATOR_GREEN_BLINK: |
| 474 | selector = HUB_LED_GREEN; |
| 475 | mode = INDICATOR_GREEN_BLINK_OFF; |
| 476 | break; |
| 477 | case INDICATOR_GREEN_BLINK_OFF: |
| 478 | selector = HUB_LED_OFF; |
| 479 | mode = INDICATOR_GREEN_BLINK; |
| 480 | break; |
| 481 | /* blinking amber = hw attention */ |
| 482 | case INDICATOR_AMBER_BLINK: |
| 483 | selector = HUB_LED_AMBER; |
| 484 | mode = INDICATOR_AMBER_BLINK_OFF; |
| 485 | break; |
| 486 | case INDICATOR_AMBER_BLINK_OFF: |
| 487 | selector = HUB_LED_OFF; |
| 488 | mode = INDICATOR_AMBER_BLINK; |
| 489 | break; |
| 490 | /* blink green/amber = reserved */ |
| 491 | case INDICATOR_ALT_BLINK: |
| 492 | selector = HUB_LED_GREEN; |
| 493 | mode = INDICATOR_ALT_BLINK_OFF; |
| 494 | break; |
| 495 | case INDICATOR_ALT_BLINK_OFF: |
| 496 | selector = HUB_LED_AMBER; |
| 497 | mode = INDICATOR_ALT_BLINK; |
| 498 | break; |
| 499 | default: |
| 500 | continue; |
| 501 | } |
| 502 | if (selector != HUB_LED_AUTO) |
| 503 | changed = 1; |
| 504 | set_port_led(hub, i + 1, selector); |
| 505 | hub->indicator[i] = mode; |
| 506 | } |
| 507 | if (!changed && blinkenlights) { |
| 508 | cursor++; |
Krzysztof Mazur | 3bbc47d | 2013-08-22 14:49:40 +0200 | [diff] [blame] | 509 | cursor %= hdev->maxchild; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
| 511 | hub->indicator[cursor] = INDICATOR_CYCLE; |
| 512 | changed++; |
| 513 | } |
| 514 | if (changed) |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 515 | queue_delayed_work(system_power_efficient_wq, |
| 516 | &hub->leds, LED_CYCLE_PERIOD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | /* use a short timeout for hub/port status fetches */ |
| 520 | #define USB_STS_TIMEOUT 1000 |
| 521 | #define USB_STS_RETRIES 5 |
| 522 | |
| 523 | /* |
| 524 | * USB 2.0 spec Section 11.24.2.6 |
| 525 | */ |
| 526 | static int get_hub_status(struct usb_device *hdev, |
| 527 | struct usb_hub_status *data) |
| 528 | { |
| 529 | int i, status = -ETIMEDOUT; |
| 530 | |
Libor Pechacek | 3824c1d | 2011-05-20 14:53:25 +0200 | [diff] [blame] | 531 | for (i = 0; i < USB_STS_RETRIES && |
| 532 | (status == -ETIMEDOUT || status == -EPIPE); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 534 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
| 535 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 536 | } |
| 537 | return status; |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * USB 2.0 spec Section 11.24.2.7 |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 542 | * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | */ |
| 544 | static int get_port_status(struct usb_device *hdev, int port1, |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 545 | void *data, u16 value, u16 length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
| 547 | int i, status = -ETIMEDOUT; |
| 548 | |
Libor Pechacek | 3824c1d | 2011-05-20 14:53:25 +0200 | [diff] [blame] | 549 | for (i = 0; i < USB_STS_RETRIES && |
| 550 | (status == -ETIMEDOUT || status == -EPIPE); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 552 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, |
| 553 | port1, data, length, USB_STS_TIMEOUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | return status; |
| 556 | } |
| 557 | |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 558 | static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, |
| 559 | u16 *status, u16 *change, u32 *ext_status) |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 560 | { |
| 561 | int ret; |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 562 | int len = 4; |
| 563 | |
| 564 | if (type != HUB_PORT_STATUS) |
| 565 | len = 8; |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 566 | |
| 567 | mutex_lock(&hub->status_mutex); |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 568 | ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); |
| 569 | if (ret < len) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 570 | if (ret != -ENODEV) |
| 571 | dev_err(hub->intfdev, |
| 572 | "%s failed (err = %d)\n", __func__, ret); |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 573 | if (ret >= 0) |
| 574 | ret = -EIO; |
| 575 | } else { |
| 576 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
| 577 | *change = le16_to_cpu(hub->status->port.wPortChange); |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 578 | if (type != HUB_PORT_STATUS && ext_status) |
| 579 | *ext_status = le32_to_cpu( |
| 580 | hub->status->port.dwExtPortStatus); |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 581 | ret = 0; |
| 582 | } |
| 583 | mutex_unlock(&hub->status_mutex); |
| 584 | return ret; |
| 585 | } |
| 586 | |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 587 | static int hub_port_status(struct usb_hub *hub, int port1, |
| 588 | u16 *status, u16 *change) |
| 589 | { |
| 590 | return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, |
| 591 | status, change, NULL); |
| 592 | } |
| 593 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 594 | static void kick_hub_wq(struct usb_hub *hub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | { |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 596 | struct usb_interface *intf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 598 | if (hub->disconnected || work_pending(&hub->events)) |
| 599 | return; |
Alan Stern | 8e4ceb3 | 2009-12-07 13:01:37 -0500 | [diff] [blame] | 600 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 601 | /* |
| 602 | * Suppress autosuspend until the event is proceed. |
| 603 | * |
| 604 | * Be careful and make sure that the symmetric operation is |
| 605 | * always called. We are here only when there is no pending |
| 606 | * work for this hub. Therefore put the interface either when |
| 607 | * the new work is called or when it is canceled. |
| 608 | */ |
| 609 | intf = to_usb_interface(hub->intfdev); |
| 610 | usb_autopm_get_interface_no_resume(intf); |
| 611 | kref_get(&hub->kref); |
| 612 | |
| 613 | if (queue_work(hub_wq, &hub->events)) |
| 614 | return; |
| 615 | |
| 616 | /* the work has already been scheduled */ |
| 617 | usb_autopm_put_interface_async(intf); |
| 618 | kref_put(&hub->kref, hub_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
Petr Mladek | 59d48b3 | 2014-09-19 17:32:22 +0200 | [diff] [blame] | 621 | void usb_kick_hub_wq(struct usb_device *hdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 623 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Alan Stern | 25118084 | 2009-07-22 14:41:18 -0400 | [diff] [blame] | 624 | |
| 625 | if (hub) |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 626 | kick_hub_wq(hub); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Sarah Sharp | 4ee823b | 2011-11-14 18:00:01 -0800 | [diff] [blame] | 629 | /* |
| 630 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device |
| 631 | * Notification, which indicates it had initiated remote wakeup. |
| 632 | * |
| 633 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the |
| 634 | * device initiates resume, so the USB core will not receive notice of the |
| 635 | * resume through the normal hub interrupt URB. |
| 636 | */ |
| 637 | void usb_wakeup_notification(struct usb_device *hdev, |
| 638 | unsigned int portnum) |
| 639 | { |
| 640 | struct usb_hub *hub; |
| 641 | |
| 642 | if (!hdev) |
| 643 | return; |
| 644 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 645 | hub = usb_hub_to_struct_hub(hdev); |
Sarah Sharp | 4ee823b | 2011-11-14 18:00:01 -0800 | [diff] [blame] | 646 | if (hub) { |
| 647 | set_bit(portnum, hub->wakeup_bits); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 648 | kick_hub_wq(hub); |
Sarah Sharp | 4ee823b | 2011-11-14 18:00:01 -0800 | [diff] [blame] | 649 | } |
| 650 | } |
| 651 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | /* completion function, fires on port status changes and various faults */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 654 | static void hub_irq(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
Tobias Klauser | ec17cf1 | 2006-09-13 21:38:41 +0200 | [diff] [blame] | 656 | struct usb_hub *hub = urb->context; |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 657 | int status = urb->status; |
Roel Kluin | 71d2718 | 2009-03-13 12:19:18 +0100 | [diff] [blame] | 658 | unsigned i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | unsigned long bits; |
| 660 | |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 661 | switch (status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | case -ENOENT: /* synchronous unlink */ |
| 663 | case -ECONNRESET: /* async unlink */ |
| 664 | case -ESHUTDOWN: /* hardware going away */ |
| 665 | return; |
| 666 | |
| 667 | default: /* presumably an error */ |
| 668 | /* Cause a hub reset after 10 consecutive errors */ |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 669 | dev_dbg(hub->intfdev, "transfer --> %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | if ((++hub->nerrors < 10) || hub->error) |
| 671 | goto resubmit; |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 672 | hub->error = status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | /* FALL THROUGH */ |
Tobias Klauser | ec17cf1 | 2006-09-13 21:38:41 +0200 | [diff] [blame] | 674 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 675 | /* let hub_wq handle things */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | case 0: /* we got data: port status changed */ |
| 677 | bits = 0; |
| 678 | for (i = 0; i < urb->actual_length; ++i) |
| 679 | bits |= ((unsigned long) ((*hub->buffer)[i])) |
| 680 | << (i*8); |
| 681 | hub->event_bits[0] = bits; |
| 682 | break; |
| 683 | } |
| 684 | |
| 685 | hub->nerrors = 0; |
| 686 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 687 | /* Something happened, let hub_wq figure it out */ |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 688 | kick_hub_wq(hub); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
| 690 | resubmit: |
| 691 | if (hub->quiescing) |
| 692 | return; |
| 693 | |
Kris Borer | 088a3da | 2015-08-11 11:12:45 -0400 | [diff] [blame] | 694 | status = usb_submit_urb(hub->urb, GFP_ATOMIC); |
| 695 | if (status != 0 && status != -ENODEV && status != -EPERM) |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 696 | dev_err(hub->intfdev, "resubmit --> %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | /* USB 2.0 spec Section 11.24.2.3 */ |
| 700 | static inline int |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 701 | hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
William Gulland | 2c7b871 | 2013-06-27 16:10:20 -0700 | [diff] [blame] | 703 | /* Need to clear both directions for control ep */ |
| 704 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == |
| 705 | USB_ENDPOINT_XFER_CONTROL) { |
| 706 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 707 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, |
| 708 | devinfo ^ 0x8000, tt, NULL, 0, 1000); |
| 709 | if (status) |
| 710 | return status; |
| 711 | } |
Alan Stern | c2f6595 | 2009-11-18 11:37:15 -0500 | [diff] [blame] | 712 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
| 714 | tt, NULL, 0, 1000); |
| 715 | } |
| 716 | |
| 717 | /* |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 718 | * enumeration blocks hub_wq for a long time. we use keventd instead, since |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | * long blocking there is the exception, not the rule. accordingly, HCDs |
| 720 | * talking to TTs must queue control transfers (not just bulk and iso), so |
| 721 | * both can talk to the same hub concurrently. |
| 722 | */ |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 723 | static void hub_tt_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 725 | struct usb_hub *hub = |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 726 | container_of(work, struct usb_hub, tt.clear_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | unsigned long flags; |
| 728 | |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 729 | spin_lock_irqsave(&hub->tt.lock, flags); |
Octavian Purdila | 3b6054d | 2012-10-01 22:21:12 +0300 | [diff] [blame] | 730 | while (!list_empty(&hub->tt.clear_list)) { |
H Hartley Sweeten | d0f830d | 2009-04-22 16:03:05 -0400 | [diff] [blame] | 731 | struct list_head *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | struct usb_tt_clear *clear; |
| 733 | struct usb_device *hdev = hub->hdev; |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 734 | const struct hc_driver *drv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | int status; |
| 736 | |
H Hartley Sweeten | d0f830d | 2009-04-22 16:03:05 -0400 | [diff] [blame] | 737 | next = hub->tt.clear_list.next; |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 738 | clear = list_entry(next, struct usb_tt_clear, clear_list); |
| 739 | list_del(&clear->clear_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | /* drop lock so HCD can concurrently report other TT errors */ |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 742 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
| 743 | status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 744 | if (status && status != -ENODEV) |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 745 | dev_err(&hdev->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | "clear tt %d (%04x) error %d\n", |
| 747 | clear->tt, clear->devinfo, status); |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 748 | |
| 749 | /* Tell the HCD, even if the operation failed */ |
| 750 | drv = clear->hcd->driver; |
| 751 | if (drv->clear_tt_buffer_complete) |
| 752 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); |
| 753 | |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 754 | kfree(clear); |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 755 | spin_lock_irqsave(&hub->tt.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 757 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | /** |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 761 | * usb_hub_set_port_power - control hub port's power state |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 762 | * @hdev: USB device belonging to the usb hub |
| 763 | * @hub: target hub |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 764 | * @port1: port index |
| 765 | * @set: expected status |
| 766 | * |
| 767 | * call this function to control port's power via setting or |
| 768 | * clearing the port's PORT_POWER feature. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 769 | * |
| 770 | * Return: 0 if successful. A negative error code otherwise. |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 771 | */ |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 772 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
| 773 | int port1, bool set) |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 774 | { |
| 775 | int ret; |
| 776 | |
| 777 | if (set) |
| 778 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| 779 | else |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 780 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| 781 | |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 782 | if (ret) |
| 783 | return ret; |
| 784 | |
| 785 | if (set) |
| 786 | set_bit(port1, hub->power_bits); |
| 787 | else |
| 788 | clear_bit(port1, hub->power_bits); |
| 789 | return 0; |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /** |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 793 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
| 794 | * @urb: an URB associated with the failed or incomplete split transaction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | * |
| 796 | * High speed HCDs use this to tell the hub driver that some split control or |
| 797 | * bulk transaction failed in a way that requires clearing internal state of |
| 798 | * a transaction translator. This is normally detected (and reported) from |
| 799 | * interrupt context. |
| 800 | * |
| 801 | * It may not be possible for that hub to handle additional full (or low) |
| 802 | * speed transactions until that state is fully cleared out. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 803 | * |
| 804 | * Return: 0 if successful. A negative error code otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | */ |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 806 | int usb_hub_clear_tt_buffer(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | { |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 808 | struct usb_device *udev = urb->dev; |
| 809 | int pipe = urb->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | struct usb_tt *tt = udev->tt; |
| 811 | unsigned long flags; |
| 812 | struct usb_tt_clear *clear; |
| 813 | |
| 814 | /* we've got to cope with an arbitrary number of pending TT clears, |
| 815 | * since each TT has "at least two" buffers that can need it (and |
| 816 | * there can be many TTs per hub). even if they're uncommon. |
| 817 | */ |
Greg Kroah-Hartman | d544d27 | 2015-04-30 11:32:53 +0200 | [diff] [blame] | 818 | clear = kmalloc(sizeof *clear, GFP_ATOMIC); |
| 819 | if (clear == NULL) { |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 820 | dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | /* FIXME recover somehow ... RESET_TT? */ |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 822 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | /* info that CLEAR_TT_BUFFER needs */ |
| 826 | clear->tt = tt->multi ? udev->ttport : 1; |
| 827 | clear->devinfo = usb_pipeendpoint (pipe); |
| 828 | clear->devinfo |= udev->devnum << 4; |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 829 | clear->devinfo |= usb_pipecontrol(pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
| 831 | : (USB_ENDPOINT_XFER_BULK << 11); |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 832 | if (usb_pipein(pipe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | clear->devinfo |= 1 << 15; |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 834 | |
| 835 | /* info for completion callback */ |
| 836 | clear->hcd = bus_to_hcd(udev->bus); |
| 837 | clear->ep = urb->ep; |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | /* tell keventd to clear state for this TT */ |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 840 | spin_lock_irqsave(&tt->lock, flags); |
| 841 | list_add_tail(&clear->clear_list, &tt->clear_list); |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 842 | schedule_work(&tt->clear_work); |
Chase Metzger | 166b863 | 2015-08-08 01:03:34 -0700 | [diff] [blame] | 843 | spin_unlock_irqrestore(&tt->lock, flags); |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 844 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 846 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Dan Williams | 7ad3c47 | 2014-05-20 18:08:57 -0700 | [diff] [blame] | 848 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | { |
| 850 | int port1; |
| 851 | |
Alan Stern | 4489a57 | 2006-04-27 15:54:22 -0400 | [diff] [blame] | 852 | /* Enable power on each port. Some hubs have reserved values |
| 853 | * of LPSM (> 2) in their descriptors, even though they are |
| 854 | * USB 2.0 hubs. Some hubs do not implement port-power switching |
| 855 | * but only emulate it. In all cases, the ports won't work |
| 856 | * unless we send these messages to the hub. |
| 857 | */ |
Dan Williams | 9262c19 | 2014-05-20 18:08:12 -0700 | [diff] [blame] | 858 | if (hub_is_port_power_switchable(hub)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
Alan Stern | 4489a57 | 2006-04-27 15:54:22 -0400 | [diff] [blame] | 860 | else |
| 861 | dev_dbg(hub->intfdev, "trying to enable port power on " |
| 862 | "non-switchable hub\n"); |
Krzysztof Mazur | 3bbc47d | 2013-08-22 14:49:40 +0200 | [diff] [blame] | 863 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 864 | if (test_bit(port1, hub->power_bits)) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 865 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
| 866 | else |
| 867 | usb_clear_port_feature(hub->hdev, port1, |
| 868 | USB_PORT_FEAT_POWER); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 869 | if (do_delay) |
Dan Williams | 7ad3c47 | 2014-05-20 18:08:57 -0700 | [diff] [blame] | 870 | msleep(hub_power_on_good_delay(hub)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | } |
| 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | static int hub_hub_status(struct usb_hub *hub, |
| 874 | u16 *status, u16 *change) |
| 875 | { |
| 876 | int ret; |
| 877 | |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 878 | mutex_lock(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 880 | if (ret < 0) { |
| 881 | if (ret != -ENODEV) |
| 882 | dev_err(hub->intfdev, |
| 883 | "%s failed (err = %d)\n", __func__, ret); |
| 884 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 886 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | ret = 0; |
| 888 | } |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 889 | mutex_unlock(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | return ret; |
| 891 | } |
| 892 | |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 893 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
| 894 | unsigned int link_status) |
| 895 | { |
| 896 | return set_port_feature(hub->hdev, |
| 897 | port1 | (link_status << 3), |
| 898 | USB_PORT_FEAT_LINK_STATE); |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * If USB 3.0 ports are placed into the Disabled state, they will no longer |
| 903 | * detect any device connects or disconnects. This is generally not what the |
| 904 | * USB core wants, since it expects a disabled port to produce a port status |
| 905 | * change event when a new device connects. |
| 906 | * |
| 907 | * Instead, set the link state to Disabled, wait for the link to settle into |
| 908 | * that state, clear any change bits, and then put the port into the RxDetect |
| 909 | * state. |
| 910 | */ |
| 911 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) |
| 912 | { |
| 913 | int ret; |
| 914 | int total_time; |
| 915 | u16 portchange, portstatus; |
| 916 | |
| 917 | if (!hub_is_superspeed(hub->hdev)) |
| 918 | return -EINVAL; |
| 919 | |
Gavin Guo | bb86cf5 | 2014-07-18 01:12:13 +0800 | [diff] [blame] | 920 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 921 | if (ret < 0) |
| 922 | return ret; |
| 923 | |
| 924 | /* |
| 925 | * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI |
| 926 | * Controller [1022:7814] will have spurious result making the following |
| 927 | * usb 3.0 device hotplugging route to the 2.0 root hub and recognized |
| 928 | * as high-speed device if we set the usb 3.0 port link state to |
| 929 | * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we |
| 930 | * check the state here to avoid the bug. |
| 931 | */ |
| 932 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == |
| 933 | USB_SS_PORT_LS_RX_DETECT) { |
| 934 | dev_dbg(&hub->ports[port1 - 1]->dev, |
| 935 | "Not disabling port; link state is RxDetect\n"); |
| 936 | return ret; |
| 937 | } |
| 938 | |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 939 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 940 | if (ret) |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 941 | return ret; |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 942 | |
| 943 | /* Wait for the link to enter the disabled state. */ |
| 944 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| 945 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 946 | if (ret < 0) |
| 947 | return ret; |
| 948 | |
| 949 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == |
| 950 | USB_SS_PORT_LS_SS_DISABLED) |
| 951 | break; |
| 952 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| 953 | break; |
| 954 | msleep(HUB_DEBOUNCE_STEP); |
| 955 | } |
| 956 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 957 | dev_warn(&hub->ports[port1 - 1]->dev, |
| 958 | "Could not disable after %d ms\n", total_time); |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 959 | |
| 960 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); |
| 961 | } |
| 962 | |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 963 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
| 964 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 965 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 966 | struct usb_device *hdev = hub->hdev; |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 967 | int ret = 0; |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 968 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 969 | if (port_dev->child && set_state) |
| 970 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 971 | if (!hub->error) { |
| 972 | if (hub_is_superspeed(hub->hdev)) |
| 973 | ret = hub_usb3_port_disable(hub, port1); |
| 974 | else |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 975 | ret = usb_clear_port_feature(hdev, port1, |
Sarah Sharp | 41e7e05 | 2012-11-14 16:42:32 -0800 | [diff] [blame] | 976 | USB_PORT_FEAT_ENABLE); |
| 977 | } |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 978 | if (ret && ret != -ENODEV) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 979 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 980 | return ret; |
| 981 | } |
| 982 | |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 983 | /* |
Justin P. Mattock | 6d42fcd | 2011-02-26 20:33:56 -0800 | [diff] [blame] | 984 | * Disable a port and mark a logical connect-change event, so that some |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 985 | * time later hub_wq will disconnect() any existing usb_device on the port |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 986 | * and will re-enumerate if there actually is a device attached. |
| 987 | */ |
| 988 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
| 989 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 990 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 991 | hub_port_disable(hub, port1, 1); |
| 992 | |
| 993 | /* FIXME let caller ask to power down the port: |
| 994 | * - some devices won't enumerate without a VBUS power cycle |
| 995 | * - SRP saves power that way |
| 996 | * - ... new call, TBD ... |
| 997 | * That's easy if this hub can switch power per-port, and |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 998 | * hub_wq reactivates the port later (timer, SRP, etc). |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 999 | * Powerdown must be optional, because of reset/DFU. |
| 1000 | */ |
| 1001 | |
| 1002 | set_bit(port1, hub->change_bits); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 1003 | kick_hub_wq(hub); |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 1004 | } |
| 1005 | |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 1006 | /** |
| 1007 | * usb_remove_device - disable a device's port on its parent hub |
| 1008 | * @udev: device to be disabled and removed |
| 1009 | * Context: @udev locked, must be able to sleep. |
| 1010 | * |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1011 | * After @udev's port has been disabled, hub_wq is notified and it will |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 1012 | * see that the device has been disconnected. When the device is |
| 1013 | * physically unplugged and something is plugged in, the events will |
| 1014 | * be received and processed normally. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 1015 | * |
| 1016 | * Return: 0 if successful. A negative error code otherwise. |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 1017 | */ |
| 1018 | int usb_remove_device(struct usb_device *udev) |
| 1019 | { |
| 1020 | struct usb_hub *hub; |
| 1021 | struct usb_interface *intf; |
| 1022 | |
| 1023 | if (!udev->parent) /* Can't remove a root hub */ |
| 1024 | return -EINVAL; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1025 | hub = usb_hub_to_struct_hub(udev->parent); |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 1026 | intf = to_usb_interface(hub->intfdev); |
| 1027 | |
| 1028 | usb_autopm_get_interface(intf); |
| 1029 | set_bit(udev->portnum, hub->removed_bits); |
| 1030 | hub_port_logical_disconnect(hub, udev->portnum); |
| 1031 | usb_autopm_put_interface(intf); |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1035 | enum hub_activation_type { |
Alan Stern | 8e4ceb3 | 2009-12-07 13:01:37 -0500 | [diff] [blame] | 1036 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1037 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1038 | }; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1039 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1040 | static void hub_init_func2(struct work_struct *ws); |
| 1041 | static void hub_init_func3(struct work_struct *ws); |
| 1042 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1043 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1044 | { |
| 1045 | struct usb_device *hdev = hub->hdev; |
Sarah Sharp | 653a39d | 2010-12-23 11:12:42 -0800 | [diff] [blame] | 1046 | struct usb_hcd *hcd; |
| 1047 | int ret; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1048 | int port1; |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1049 | int status; |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1050 | bool need_debounce_delay = false; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1051 | unsigned delay; |
| 1052 | |
| 1053 | /* Continue a partial initialization */ |
Alan Stern | e50293e | 2015-12-16 13:32:38 -0500 | [diff] [blame] | 1054 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
Alan Stern | 07d316a | 2016-08-05 11:51:30 -0400 | [diff] [blame] | 1055 | device_lock(&hdev->dev); |
Alan Stern | e50293e | 2015-12-16 13:32:38 -0500 | [diff] [blame] | 1056 | |
| 1057 | /* Was the hub disconnected while we were waiting? */ |
Alan Stern | ca5cbc8 | 2016-08-05 11:49:45 -0400 | [diff] [blame] | 1058 | if (hub->disconnected) |
| 1059 | goto disconnected; |
Alan Stern | e50293e | 2015-12-16 13:32:38 -0500 | [diff] [blame] | 1060 | if (type == HUB_INIT2) |
| 1061 | goto init2; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1062 | goto init3; |
Alan Stern | e50293e | 2015-12-16 13:32:38 -0500 | [diff] [blame] | 1063 | } |
| 1064 | kref_get(&hub->kref); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1065 | |
Elric Fu | a45aa3b | 2012-02-18 13:32:27 +0800 | [diff] [blame] | 1066 | /* The superspeed hub except for root hub has to use Hub Depth |
| 1067 | * value as an offset into the route string to locate the bits |
| 1068 | * it uses to determine the downstream port number. So hub driver |
| 1069 | * should send a set hub depth request to superspeed hub after |
| 1070 | * the superspeed hub is set configuration in initialization or |
| 1071 | * reset procedure. |
| 1072 | * |
| 1073 | * After a resume, port power should still be on. |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1074 | * For any other type of activation, turn it on. |
| 1075 | */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1076 | if (type != HUB_RESUME) { |
Elric Fu | a45aa3b | 2012-02-18 13:32:27 +0800 | [diff] [blame] | 1077 | if (hdev->parent && hub_is_superspeed(hdev)) { |
| 1078 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 1079 | HUB_SET_DEPTH, USB_RT_HUB, |
| 1080 | hdev->level - 1, 0, NULL, 0, |
| 1081 | USB_CTRL_SET_TIMEOUT); |
| 1082 | if (ret < 0) |
| 1083 | dev_err(hub->intfdev, |
| 1084 | "set hub depth failed\n"); |
| 1085 | } |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1086 | |
| 1087 | /* Speed up system boot by using a delayed_work for the |
| 1088 | * hub's initial power-up delays. This is pretty awkward |
| 1089 | * and the implementation looks like a home-brewed sort of |
| 1090 | * setjmp/longjmp, but it saves at least 100 ms for each |
| 1091 | * root hub (assuming usbcore is compiled into the kernel |
| 1092 | * rather than as a module). It adds up. |
| 1093 | * |
| 1094 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME |
| 1095 | * because for those activation types the ports have to be |
| 1096 | * operational when we return. In theory this could be done |
| 1097 | * for HUB_POST_RESET, but it's easier not to. |
| 1098 | */ |
| 1099 | if (type == HUB_INIT) { |
Kris Borer | 17a364e | 2015-08-21 10:47:46 +0530 | [diff] [blame] | 1100 | delay = hub_power_on_good_delay(hub); |
Dan Williams | 7ad3c47 | 2014-05-20 18:08:57 -0700 | [diff] [blame] | 1101 | |
| 1102 | hub_power_on(hub, false); |
Tejun Heo | 77fa83c | 2014-03-07 10:24:48 -0500 | [diff] [blame] | 1103 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 1104 | queue_delayed_work(system_power_efficient_wq, |
| 1105 | &hub->init_work, |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1106 | msecs_to_jiffies(delay)); |
Alan Stern | 61fbeba | 2008-10-27 12:07:44 -0400 | [diff] [blame] | 1107 | |
| 1108 | /* Suppress autosuspend until init is done */ |
Alan Stern | 8e4ceb3 | 2009-12-07 13:01:37 -0500 | [diff] [blame] | 1109 | usb_autopm_get_interface_no_resume( |
| 1110 | to_usb_interface(hub->intfdev)); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1111 | return; /* Continues at init2: below */ |
Sarah Sharp | 653a39d | 2010-12-23 11:12:42 -0800 | [diff] [blame] | 1112 | } else if (type == HUB_RESET_RESUME) { |
| 1113 | /* The internal host controller state for the hub device |
| 1114 | * may be gone after a host power loss on system resume. |
| 1115 | * Update the device's info so the HW knows it's a hub. |
| 1116 | */ |
| 1117 | hcd = bus_to_hcd(hdev->bus); |
| 1118 | if (hcd->driver->update_hub_device) { |
| 1119 | ret = hcd->driver->update_hub_device(hcd, hdev, |
| 1120 | &hub->tt, GFP_NOIO); |
| 1121 | if (ret < 0) { |
| 1122 | dev_err(hub->intfdev, "Host not " |
| 1123 | "accepting hub info " |
| 1124 | "update.\n"); |
| 1125 | dev_err(hub->intfdev, "LS/FS devices " |
| 1126 | "and hubs may not work " |
| 1127 | "under this hub\n."); |
| 1128 | } |
| 1129 | } |
| 1130 | hub_power_on(hub, true); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1131 | } else { |
| 1132 | hub_power_on(hub, true); |
| 1133 | } |
| 1134 | } |
| 1135 | init2: |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1136 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 1137 | /* |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1138 | * Check each port and set hub->change_bits to let hub_wq know |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1139 | * which ports need attention. |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1140 | */ |
| 1141 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 1142 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 1143 | struct usb_device *udev = port_dev->child; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1144 | u16 portstatus, portchange; |
| 1145 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1146 | portstatus = portchange = 0; |
| 1147 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 1148 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 1149 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
| 1150 | portstatus, portchange); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1151 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 1152 | /* |
| 1153 | * After anything other than HUB_RESUME (i.e., initialization |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1154 | * or any sort of reset), every port should be disabled. |
| 1155 | * Unconnected ports should likewise be disabled (paranoia), |
| 1156 | * and so should ports for which we have no usb_device. |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1157 | */ |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1158 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( |
| 1159 | type != HUB_RESUME || |
| 1160 | !(portstatus & USB_PORT_STAT_CONNECTION) || |
| 1161 | !udev || |
| 1162 | udev->state == USB_STATE_NOTATTACHED)) { |
Andiry Xu | 9f0a6cd | 2010-05-07 18:09:27 +0800 | [diff] [blame] | 1163 | /* |
| 1164 | * USB3 protocol ports will automatically transition |
| 1165 | * to Enabled state when detect an USB3.0 device attach. |
Dan Williams | fd1ac4c | 2013-10-07 11:58:20 -0700 | [diff] [blame] | 1166 | * Do not disable USB3 protocol ports, just pretend |
| 1167 | * power was lost |
Andiry Xu | 9f0a6cd | 2010-05-07 18:09:27 +0800 | [diff] [blame] | 1168 | */ |
Dan Williams | fd1ac4c | 2013-10-07 11:58:20 -0700 | [diff] [blame] | 1169 | portstatus &= ~USB_PORT_STAT_ENABLE; |
| 1170 | if (!hub_is_superspeed(hdev)) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1171 | usb_clear_port_feature(hdev, port1, |
Andiry Xu | 9f0a6cd | 2010-05-07 18:09:27 +0800 | [diff] [blame] | 1172 | USB_PORT_FEAT_ENABLE); |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1173 | } |
| 1174 | |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1175 | /* Clear status-change flags; we'll debounce later */ |
| 1176 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 1177 | need_debounce_delay = true; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1178 | usb_clear_port_feature(hub->hdev, port1, |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1179 | USB_PORT_FEAT_C_CONNECTION); |
| 1180 | } |
| 1181 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 1182 | need_debounce_delay = true; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1183 | usb_clear_port_feature(hub->hdev, port1, |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1184 | USB_PORT_FEAT_C_ENABLE); |
| 1185 | } |
Julius Werner | e92aee3 | 2013-10-15 17:45:00 -0700 | [diff] [blame] | 1186 | if (portchange & USB_PORT_STAT_C_RESET) { |
| 1187 | need_debounce_delay = true; |
| 1188 | usb_clear_port_feature(hub->hdev, port1, |
| 1189 | USB_PORT_FEAT_C_RESET); |
| 1190 | } |
Don Zickus | 79c3dd8 | 2011-11-03 09:07:18 -0400 | [diff] [blame] | 1191 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
| 1192 | hub_is_superspeed(hub->hdev)) { |
| 1193 | need_debounce_delay = true; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1194 | usb_clear_port_feature(hub->hdev, port1, |
Don Zickus | 79c3dd8 | 2011-11-03 09:07:18 -0400 | [diff] [blame] | 1195 | USB_PORT_FEAT_C_BH_PORT_RESET); |
| 1196 | } |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 1197 | /* We can forget about a "removed" device when there's a |
| 1198 | * physical disconnect or the connect status changes. |
| 1199 | */ |
| 1200 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 1201 | (portchange & USB_PORT_STAT_C_CONNECTION)) |
| 1202 | clear_bit(port1, hub->removed_bits); |
| 1203 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1204 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1205 | /* Tell hub_wq to disconnect the device or |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1206 | * check for a new connection |
| 1207 | */ |
Shen Guang | 08d1dec | 2014-01-08 14:45:42 +0800 | [diff] [blame] | 1208 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
| 1209 | (portstatus & USB_PORT_STAT_OVERCURRENT)) |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1210 | set_bit(port1, hub->change_bits); |
| 1211 | |
| 1212 | } else if (portstatus & USB_PORT_STAT_ENABLE) { |
Sarah Sharp | 72937e1 | 2012-01-24 11:46:50 -0800 | [diff] [blame] | 1213 | bool port_resumed = (portstatus & |
| 1214 | USB_PORT_STAT_LINK_STATE) == |
| 1215 | USB_SS_PORT_LS_U0; |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1216 | /* The power session apparently survived the resume. |
| 1217 | * If there was an overcurrent or suspend change |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1218 | * (i.e., remote wakeup request), have hub_wq |
Sarah Sharp | 72937e1 | 2012-01-24 11:46:50 -0800 | [diff] [blame] | 1219 | * take care of it. Look at the port link state |
| 1220 | * for USB 3.0 hubs, since they don't have a suspend |
| 1221 | * change bit, and they don't set the port link change |
| 1222 | * bit on device-initiated resume. |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1223 | */ |
Sarah Sharp | 72937e1 | 2012-01-24 11:46:50 -0800 | [diff] [blame] | 1224 | if (portchange || (hub_is_superspeed(hub->hdev) && |
| 1225 | port_resumed)) |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1226 | set_bit(port1, hub->change_bits); |
| 1227 | |
| 1228 | } else if (udev->persist_enabled) { |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1229 | #ifdef CONFIG_PM |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1230 | udev->reset_resume = 1; |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1231 | #endif |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1232 | /* Don't set the change_bits when the device |
| 1233 | * was powered off. |
| 1234 | */ |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 1235 | if (test_bit(port1, hub->power_bits)) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1236 | set_bit(port1, hub->change_bits); |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 1237 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1238 | } else { |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1239 | /* The power session is gone; tell hub_wq */ |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 1240 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 1241 | set_bit(port1, hub->change_bits); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1242 | } |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1243 | } |
| 1244 | |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1245 | /* If no port-status-change flags were set, we don't need any |
| 1246 | * debouncing. If flags were set we can try to debounce the |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1247 | * ports all at once right now, instead of letting hub_wq do them |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1248 | * one at a time later on. |
| 1249 | * |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1250 | * If any port-status changes do occur during this delay, hub_wq |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 1251 | * will see them later and handle them normally. |
| 1252 | */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1253 | if (need_debounce_delay) { |
| 1254 | delay = HUB_DEBOUNCE_STABLE; |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1255 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1256 | /* Don't do a long sleep inside a workqueue routine */ |
| 1257 | if (type == HUB_INIT2) { |
Tejun Heo | 77fa83c | 2014-03-07 10:24:48 -0500 | [diff] [blame] | 1258 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 1259 | queue_delayed_work(system_power_efficient_wq, |
| 1260 | &hub->init_work, |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1261 | msecs_to_jiffies(delay)); |
Alan Stern | 07d316a | 2016-08-05 11:51:30 -0400 | [diff] [blame] | 1262 | device_unlock(&hdev->dev); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1263 | return; /* Continues at init3: below */ |
| 1264 | } else { |
| 1265 | msleep(delay); |
| 1266 | } |
| 1267 | } |
| 1268 | init3: |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1269 | hub->quiescing = 0; |
| 1270 | |
| 1271 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
| 1272 | if (status < 0) |
| 1273 | dev_err(hub->intfdev, "activate --> %d\n", status); |
| 1274 | if (hub->has_indicators && blinkenlights) |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 1275 | queue_delayed_work(system_power_efficient_wq, |
| 1276 | &hub->leds, LED_CYCLE_PERIOD); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1277 | |
| 1278 | /* Scan all ports that need attention */ |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 1279 | kick_hub_wq(hub); |
Alan Stern | 8e4ceb3 | 2009-12-07 13:01:37 -0500 | [diff] [blame] | 1280 | |
Alan Stern | ca5cbc8 | 2016-08-05 11:49:45 -0400 | [diff] [blame] | 1281 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
| 1282 | /* Allow autosuspend if it was suppressed */ |
| 1283 | disconnected: |
Alan Stern | 8e4ceb3 | 2009-12-07 13:01:37 -0500 | [diff] [blame] | 1284 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
Alan Stern | 07d316a | 2016-08-05 11:51:30 -0400 | [diff] [blame] | 1285 | device_unlock(&hdev->dev); |
Alan Stern | ca5cbc8 | 2016-08-05 11:49:45 -0400 | [diff] [blame] | 1286 | } |
Alan Stern | e50293e | 2015-12-16 13:32:38 -0500 | [diff] [blame] | 1287 | |
| 1288 | kref_put(&hub->kref, hub_release); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 1289 | } |
| 1290 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1291 | /* Implement the continuations for the delays above */ |
| 1292 | static void hub_init_func2(struct work_struct *ws) |
| 1293 | { |
| 1294 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 1295 | |
| 1296 | hub_activate(hub, HUB_INIT2); |
| 1297 | } |
| 1298 | |
| 1299 | static void hub_init_func3(struct work_struct *ws) |
| 1300 | { |
| 1301 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 1302 | |
| 1303 | hub_activate(hub, HUB_INIT3); |
| 1304 | } |
| 1305 | |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1306 | enum hub_quiescing_type { |
| 1307 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND |
| 1308 | }; |
| 1309 | |
| 1310 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) |
| 1311 | { |
| 1312 | struct usb_device *hdev = hub->hdev; |
| 1313 | int i; |
| 1314 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1315 | /* hub_wq and related activity won't re-trigger */ |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1316 | hub->quiescing = 1; |
| 1317 | |
| 1318 | if (type != HUB_SUSPEND) { |
| 1319 | /* Disconnect all the children */ |
| 1320 | for (i = 0; i < hdev->maxchild; ++i) { |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 1321 | if (hub->ports[i]->child) |
| 1322 | usb_disconnect(&hub->ports[i]->child); |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1323 | } |
| 1324 | } |
| 1325 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1326 | /* Stop hub_wq and related activity */ |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1327 | usb_kill_urb(hub->urb); |
| 1328 | if (hub->has_indicators) |
| 1329 | cancel_delayed_work_sync(&hub->leds); |
| 1330 | if (hub->tt.hub) |
Octavian Purdila | 036546b | 2012-10-23 11:33:12 +0300 | [diff] [blame] | 1331 | flush_work(&hub->tt.clear_work); |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1332 | } |
| 1333 | |
Alan Stern | 600856c | 2014-05-20 18:08:07 -0700 | [diff] [blame] | 1334 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
| 1335 | { |
| 1336 | int i; |
| 1337 | |
| 1338 | for (i = 0; i < hub->hdev->maxchild; ++i) |
| 1339 | pm_runtime_barrier(&hub->ports[i]->dev); |
| 1340 | } |
| 1341 | |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 1342 | /* caller has locked the hub device */ |
| 1343 | static int hub_pre_reset(struct usb_interface *intf) |
| 1344 | { |
| 1345 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 1346 | |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1347 | hub_quiesce(hub, HUB_PRE_RESET); |
Alan Stern | 600856c | 2014-05-20 18:08:07 -0700 | [diff] [blame] | 1348 | hub->in_reset = 1; |
| 1349 | hub_pm_barrier_for_all_ports(hub); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1350 | return 0; |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 1351 | } |
| 1352 | |
| 1353 | /* caller has locked the hub device */ |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1354 | static int hub_post_reset(struct usb_interface *intf) |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 1355 | { |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 1356 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 1357 | |
Alan Stern | 600856c | 2014-05-20 18:08:07 -0700 | [diff] [blame] | 1358 | hub->in_reset = 0; |
| 1359 | hub_pm_barrier_for_all_ports(hub); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1360 | hub_activate(hub, HUB_POST_RESET); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 1361 | return 0; |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 1362 | } |
| 1363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | static int hub_configure(struct usb_hub *hub, |
| 1365 | struct usb_endpoint_descriptor *endpoint) |
| 1366 | { |
Sarah Sharp | b356b7c | 2009-09-04 10:53:24 -0700 | [diff] [blame] | 1367 | struct usb_hcd *hcd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | struct usb_device *hdev = hub->hdev; |
| 1369 | struct device *hub_dev = hub->intfdev; |
| 1370 | u16 hubstatus, hubchange; |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1371 | u16 wHubCharacteristics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | unsigned int pipe; |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1373 | int maxp, ret, i; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1374 | char *message = "out of memory"; |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1375 | unsigned unit_load; |
| 1376 | unsigned full_load; |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1377 | unsigned maxchild; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
Alan Stern | d697cdd | 2009-10-27 15:18:46 -0400 | [diff] [blame] | 1379 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | if (!hub->buffer) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | ret = -ENOMEM; |
| 1382 | goto fail; |
| 1383 | } |
| 1384 | |
| 1385 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
| 1386 | if (!hub->status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | ret = -ENOMEM; |
| 1388 | goto fail; |
| 1389 | } |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 1390 | mutex_init(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | |
| 1392 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
| 1393 | if (!hub->descriptor) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | ret = -ENOMEM; |
| 1395 | goto fail; |
| 1396 | } |
| 1397 | |
| 1398 | /* Request the entire hub descriptor. |
| 1399 | * hub->descriptor can handle USB_MAXCHILDREN ports, |
| 1400 | * but the hub can/will return fewer bytes here. |
| 1401 | */ |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 1402 | ret = get_hub_descriptor(hdev, hub->descriptor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | if (ret < 0) { |
| 1404 | message = "can't read hub descriptor"; |
| 1405 | goto fail; |
| 1406 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { |
| 1407 | message = "hub has too many ports!"; |
| 1408 | ret = -ENODEV; |
| 1409 | goto fail; |
David Linares | 769d7368 | 2013-03-25 10:50:27 +0000 | [diff] [blame] | 1410 | } else if (hub->descriptor->bNbrPorts == 0) { |
| 1411 | message = "hub doesn't have any ports!"; |
| 1412 | ret = -ENODEV; |
| 1413 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | } |
| 1415 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1416 | maxchild = hub->descriptor->bNbrPorts; |
| 1417 | dev_info(hub_dev, "%d port%s detected\n", maxchild, |
| 1418 | (maxchild == 1) ? "" : "s"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1420 | hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 1421 | if (!hub->ports) { |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1422 | ret = -ENOMEM; |
| 1423 | goto fail; |
| 1424 | } |
| 1425 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1426 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1427 | if (hub_is_superspeed(hdev)) { |
| 1428 | unit_load = 150; |
| 1429 | full_load = 900; |
| 1430 | } else { |
| 1431 | unit_load = 100; |
| 1432 | full_load = 500; |
| 1433 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 1435 | /* FIXME for USB 3.0, skip for now */ |
| 1436 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && |
| 1437 | !(hub_is_superspeed(hdev))) { |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 1438 | char portstr[USB_MAXCHILDREN + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1440 | for (i = 0; i < maxchild; i++) |
John Youn | dbe79bb | 2001-09-17 00:00:00 -0700 | [diff] [blame] | 1441 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
| 1443 | ? 'F' : 'R'; |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1444 | portstr[maxchild] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
| 1446 | } else |
| 1447 | dev_dbg(hub_dev, "standalone hub\n"); |
| 1448 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1449 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
Aman Deep | 7bf0118 | 2011-12-08 12:05:22 +0530 | [diff] [blame] | 1450 | case HUB_CHAR_COMMON_LPSM: |
| 1451 | dev_dbg(hub_dev, "ganged power switching\n"); |
| 1452 | break; |
| 1453 | case HUB_CHAR_INDV_PORT_LPSM: |
| 1454 | dev_dbg(hub_dev, "individual port power switching\n"); |
| 1455 | break; |
| 1456 | case HUB_CHAR_NO_LPSM: |
| 1457 | case HUB_CHAR_LPSM: |
| 1458 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
| 1459 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | } |
| 1461 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1462 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
Aman Deep | 7bf0118 | 2011-12-08 12:05:22 +0530 | [diff] [blame] | 1463 | case HUB_CHAR_COMMON_OCPM: |
| 1464 | dev_dbg(hub_dev, "global over-current protection\n"); |
| 1465 | break; |
| 1466 | case HUB_CHAR_INDV_PORT_OCPM: |
| 1467 | dev_dbg(hub_dev, "individual port over-current protection\n"); |
| 1468 | break; |
| 1469 | case HUB_CHAR_NO_OCPM: |
| 1470 | case HUB_CHAR_OCPM: |
| 1471 | dev_dbg(hub_dev, "no over-current protection\n"); |
| 1472 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1475 | spin_lock_init(&hub->tt.lock); |
| 1476 | INIT_LIST_HEAD(&hub->tt.clear_list); |
Alan Stern | cb88a1b | 2009-06-29 10:43:32 -0400 | [diff] [blame] | 1477 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | switch (hdev->descriptor.bDeviceProtocol) { |
Aman Deep | 7bf0118 | 2011-12-08 12:05:22 +0530 | [diff] [blame] | 1479 | case USB_HUB_PR_FS: |
| 1480 | break; |
| 1481 | case USB_HUB_PR_HS_SINGLE_TT: |
| 1482 | dev_dbg(hub_dev, "Single TT\n"); |
| 1483 | hub->tt.hub = hdev; |
| 1484 | break; |
| 1485 | case USB_HUB_PR_HS_MULTI_TT: |
| 1486 | ret = usb_set_interface(hdev, 0, 1); |
| 1487 | if (ret == 0) { |
| 1488 | dev_dbg(hub_dev, "TT per port\n"); |
| 1489 | hub->tt.multi = 1; |
| 1490 | } else |
| 1491 | dev_err(hub_dev, "Using single TT (err %d)\n", |
| 1492 | ret); |
| 1493 | hub->tt.hub = hdev; |
| 1494 | break; |
| 1495 | case USB_HUB_PR_SS: |
| 1496 | /* USB 3.0 hubs don't have a TT */ |
| 1497 | break; |
| 1498 | default: |
| 1499 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
| 1500 | hdev->descriptor.bDeviceProtocol); |
| 1501 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | } |
| 1503 | |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 1504 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1505 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 1506 | case HUB_TTTT_8_BITS: |
| 1507 | if (hdev->descriptor.bDeviceProtocol != 0) { |
| 1508 | hub->tt.think_time = 666; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 1509 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1510 | "FS bit times (%d ns)\n", |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 1511 | 8, hub->tt.think_time); |
| 1512 | } |
| 1513 | break; |
| 1514 | case HUB_TTTT_16_BITS: |
| 1515 | hub->tt.think_time = 666 * 2; |
| 1516 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1517 | "FS bit times (%d ns)\n", |
| 1518 | 16, hub->tt.think_time); |
| 1519 | break; |
| 1520 | case HUB_TTTT_24_BITS: |
| 1521 | hub->tt.think_time = 666 * 3; |
| 1522 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1523 | "FS bit times (%d ns)\n", |
| 1524 | 24, hub->tt.think_time); |
| 1525 | break; |
| 1526 | case HUB_TTTT_32_BITS: |
| 1527 | hub->tt.think_time = 666 * 4; |
| 1528 | dev_dbg(hub_dev, "TT requires at most %d " |
| 1529 | "FS bit times (%d ns)\n", |
| 1530 | 32, hub->tt.think_time); |
| 1531 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | } |
| 1533 | |
| 1534 | /* probe() zeroes hub->indicator[] */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1535 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | hub->has_indicators = 1; |
| 1537 | dev_dbg(hub_dev, "Port indicators are supported\n"); |
| 1538 | } |
| 1539 | |
| 1540 | dev_dbg(hub_dev, "power on to power good time: %dms\n", |
| 1541 | hub->descriptor->bPwrOn2PwrGood * 2); |
| 1542 | |
| 1543 | /* power budgeting mostly matters with bus-powered hubs, |
| 1544 | * and battery-powered root hubs (may provide just 8 mA). |
| 1545 | */ |
| 1546 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
Alan Stern | 15b7336 | 2013-07-30 15:35:40 -0400 | [diff] [blame] | 1547 | if (ret) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | message = "can't get hub status"; |
| 1549 | goto fail; |
| 1550 | } |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1551 | hcd = bus_to_hcd(hdev->bus); |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 1552 | if (hdev == hdev->bus->root_hub) { |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1553 | if (hcd->power_budget > 0) |
| 1554 | hdev->bus_mA = hcd->power_budget; |
| 1555 | else |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1556 | hdev->bus_mA = full_load * maxchild; |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1557 | if (hdev->bus_mA >= full_load) |
| 1558 | hub->mA_per_port = full_load; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1559 | else { |
| 1560 | hub->mA_per_port = hdev->bus_mA; |
| 1561 | hub->limited_power = 1; |
| 1562 | } |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 1563 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1564 | int remaining = hdev->bus_mA - |
| 1565 | hub->descriptor->bHubContrCurrent; |
| 1566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
| 1568 | hub->descriptor->bHubContrCurrent); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1569 | hub->limited_power = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1571 | if (remaining < maxchild * unit_load) |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1572 | dev_warn(hub_dev, |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1573 | "insufficient power available " |
| 1574 | "to use all downstream ports\n"); |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1575 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
| 1576 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1577 | } else { /* Self-powered external hub */ |
| 1578 | /* FIXME: What about battery-powered external hubs that |
| 1579 | * provide less current per port? */ |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1580 | hub->mA_per_port = full_load; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1581 | } |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 1582 | if (hub->mA_per_port < full_load) |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1583 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
| 1584 | hub->mA_per_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
| 1586 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
| 1587 | if (ret < 0) { |
| 1588 | message = "can't get hub status"; |
| 1589 | goto fail; |
| 1590 | } |
| 1591 | |
| 1592 | /* local power status reports aren't always correct */ |
| 1593 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
| 1594 | dev_dbg(hub_dev, "local power source is %s\n", |
| 1595 | (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 1596 | ? "lost (inactive)" : "good"); |
| 1597 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1598 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
| 1600 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
| 1601 | |
inaky@linux.intel.com | 88fafff | 2006-10-11 20:05:59 -0700 | [diff] [blame] | 1602 | /* set up the interrupt endpoint |
| 1603 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 |
| 1604 | * bytes as USB2.0[11.12.3] says because some hubs are known |
| 1605 | * to send more data (and thus cause overflow). For root hubs, |
| 1606 | * maxpktsize is defined in hcd.c's fake endpoint descriptors |
| 1607 | * to be big enough for at least USB_MAXCHILDREN ports. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
| 1609 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
| 1610 | |
| 1611 | if (maxp > sizeof(*hub->buffer)) |
| 1612 | maxp = sizeof(*hub->buffer); |
| 1613 | |
| 1614 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
| 1615 | if (!hub->urb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | ret = -ENOMEM; |
| 1617 | goto fail; |
| 1618 | } |
| 1619 | |
| 1620 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
| 1621 | hub, endpoint->bInterval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | |
| 1623 | /* maybe cycle the hub leds */ |
| 1624 | if (hub->has_indicators && blinkenlights) |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 1625 | hub->indicator[0] = INDICATOR_CYCLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1627 | mutex_lock(&usb_port_peer_mutex); |
| 1628 | for (i = 0; i < maxchild; i++) { |
Krzysztof Mazur | e58547e | 2013-08-22 14:49:39 +0200 | [diff] [blame] | 1629 | ret = usb_hub_create_port_device(hub, i + 1); |
| 1630 | if (ret < 0) { |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1631 | dev_err(hub->intfdev, |
| 1632 | "couldn't create port%d device.\n", i + 1); |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1633 | break; |
Krzysztof Mazur | e58547e | 2013-08-22 14:49:39 +0200 | [diff] [blame] | 1634 | } |
| 1635 | } |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1636 | hdev->maxchild = i; |
Dan Williams | e3d1050 | 2014-06-17 16:16:32 -0700 | [diff] [blame] | 1637 | for (i = 0; i < hdev->maxchild; i++) { |
| 1638 | struct usb_port *port_dev = hub->ports[i]; |
| 1639 | |
| 1640 | pm_runtime_put(&port_dev->dev); |
| 1641 | } |
| 1642 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1643 | mutex_unlock(&usb_port_peer_mutex); |
| 1644 | if (ret < 0) |
| 1645 | goto fail; |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1646 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 1647 | /* Update the HCD's internal representation of this hub before hub_wq |
Dan Williams | e3d9558 | 2014-06-05 14:23:04 -0700 | [diff] [blame] | 1648 | * starts getting port status changes for devices under the hub. |
| 1649 | */ |
| 1650 | if (hcd->driver->update_hub_device) { |
| 1651 | ret = hcd->driver->update_hub_device(hcd, hdev, |
| 1652 | &hub->tt, GFP_KERNEL); |
| 1653 | if (ret < 0) { |
| 1654 | message = "can't update HCD hub info"; |
| 1655 | goto fail; |
| 1656 | } |
| 1657 | } |
| 1658 | |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 1659 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
| 1660 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1661 | hub_activate(hub, HUB_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | return 0; |
| 1663 | |
| 1664 | fail: |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1665 | dev_err(hub_dev, "config failed, %s (err %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | message, ret); |
| 1667 | /* hub_disconnect() frees urb and descriptor */ |
| 1668 | return ret; |
| 1669 | } |
| 1670 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1671 | static void hub_release(struct kref *kref) |
| 1672 | { |
| 1673 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); |
| 1674 | |
Petr Mladek | 5d14f32 | 2014-09-19 17:32:19 +0200 | [diff] [blame] | 1675 | usb_put_dev(hub->hdev); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1676 | usb_put_intf(to_usb_interface(hub->intfdev)); |
| 1677 | kfree(hub); |
| 1678 | } |
| 1679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | static unsigned highspeed_hubs; |
| 1681 | |
| 1682 | static void hub_disconnect(struct usb_interface *intf) |
| 1683 | { |
Huajun Li | 8816230 | 2012-03-12 21:00:19 +0800 | [diff] [blame] | 1684 | struct usb_hub *hub = usb_get_intfdata(intf); |
Greg Kroah-Hartman | fa28618 | 2012-05-14 09:20:37 -0700 | [diff] [blame] | 1685 | struct usb_device *hdev = interface_to_usbdev(intf); |
Alan Stern | 543d778 | 2014-01-07 10:43:02 -0500 | [diff] [blame] | 1686 | int port1; |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1687 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 1688 | /* |
| 1689 | * Stop adding new hub events. We do not want to block here and thus |
| 1690 | * will not try to remove any pending work item. |
| 1691 | */ |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1692 | hub->disconnected = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 1694 | /* Disconnect all children and quiesce the hub */ |
| 1695 | hub->error = 0; |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1696 | hub_quiesce(hub, HUB_DISCONNECT); |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 1697 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1698 | mutex_lock(&usb_port_peer_mutex); |
| 1699 | |
Alan Stern | 543d778 | 2014-01-07 10:43:02 -0500 | [diff] [blame] | 1700 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
| 1701 | spin_lock_irq(&device_state_lock); |
| 1702 | port1 = hdev->maxchild; |
| 1703 | hdev->maxchild = 0; |
| 1704 | usb_set_intfdata(intf, NULL); |
| 1705 | spin_unlock_irq(&device_state_lock); |
Alexander Shishkin | 1f2235b | 2012-09-12 14:48:31 +0300 | [diff] [blame] | 1706 | |
Alan Stern | 543d778 | 2014-01-07 10:43:02 -0500 | [diff] [blame] | 1707 | for (; port1 > 0; --port1) |
| 1708 | usb_hub_remove_port_device(hub, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 1710 | mutex_unlock(&usb_port_peer_mutex); |
| 1711 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1712 | if (hub->hdev->speed == USB_SPEED_HIGH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | highspeed_hubs--; |
| 1714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | usb_free_urb(hub->urb); |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1716 | kfree(hub->ports); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 1717 | kfree(hub->descriptor); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 1718 | kfree(hub->status); |
Alan Stern | d697cdd | 2009-10-27 15:18:46 -0400 | [diff] [blame] | 1719 | kfree(hub->buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 1721 | pm_suspend_ignore_children(&intf->dev, false); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1722 | kref_put(&hub->kref, hub_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
| 1725 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| 1726 | { |
| 1727 | struct usb_host_interface *desc; |
| 1728 | struct usb_endpoint_descriptor *endpoint; |
| 1729 | struct usb_device *hdev; |
| 1730 | struct usb_hub *hub; |
| 1731 | |
| 1732 | desc = intf->cur_altsetting; |
| 1733 | hdev = interface_to_usbdev(intf); |
| 1734 | |
Ming Lei | 596d789 | 2012-10-24 11:59:25 +0800 | [diff] [blame] | 1735 | /* |
| 1736 | * Set default autosuspend delay as 0 to speedup bus suspend, |
| 1737 | * based on the below considerations: |
| 1738 | * |
| 1739 | * - Unlike other drivers, the hub driver does not rely on the |
| 1740 | * autosuspend delay to provide enough time to handle a wakeup |
| 1741 | * event, and the submitted status URB is just to check future |
| 1742 | * change on hub downstream ports, so it is safe to do it. |
| 1743 | * |
| 1744 | * - The patch might cause one or more auto supend/resume for |
| 1745 | * below very rare devices when they are plugged into hub |
| 1746 | * first time: |
| 1747 | * |
| 1748 | * devices having trouble initializing, and disconnect |
| 1749 | * themselves from the bus and then reconnect a second |
| 1750 | * or so later |
| 1751 | * |
| 1752 | * devices just for downloading firmware, and disconnects |
| 1753 | * themselves after completing it |
| 1754 | * |
| 1755 | * For these quite rare devices, their drivers may change the |
| 1756 | * autosuspend delay of their parent hub in the probe() to one |
| 1757 | * appropriate value to avoid the subtle problem if someone |
| 1758 | * does care it. |
| 1759 | * |
| 1760 | * - The patch may cause one or more auto suspend/resume on |
| 1761 | * hub during running 'lsusb', but it is probably too |
| 1762 | * infrequent to worry about. |
| 1763 | * |
| 1764 | * - Change autosuspend delay of hub can avoid unnecessary auto |
| 1765 | * suspend timer for hub, also may decrease power consumption |
| 1766 | * of USB bus. |
Roger Quadros | bdd405d | 2014-08-04 12:44:46 +0300 | [diff] [blame] | 1767 | * |
| 1768 | * - If user has indicated to prevent autosuspend by passing |
| 1769 | * usbcore.autosuspend = -1 then keep autosuspend disabled. |
Ming Lei | 596d789 | 2012-10-24 11:59:25 +0800 | [diff] [blame] | 1770 | */ |
Rafael J. Wysocki | ceb6c9c | 2014-11-29 23:47:05 +0100 | [diff] [blame] | 1771 | #ifdef CONFIG_PM |
Roger Quadros | bdd405d | 2014-08-04 12:44:46 +0300 | [diff] [blame] | 1772 | if (hdev->dev.power.autosuspend_delay >= 0) |
| 1773 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); |
Greg Kroah-Hartman | a9ef803 | 2014-08-27 16:55:29 -0700 | [diff] [blame] | 1774 | #endif |
Ming Lei | 596d789 | 2012-10-24 11:59:25 +0800 | [diff] [blame] | 1775 | |
Alan Stern | 8ef42dd | 2014-05-23 10:45:54 -0400 | [diff] [blame] | 1776 | /* |
| 1777 | * Hubs have proper suspend/resume support, except for root hubs |
| 1778 | * where the controller driver doesn't have bus_suspend and |
| 1779 | * bus_resume methods. |
| 1780 | */ |
| 1781 | if (hdev->parent) { /* normal device */ |
| 1782 | usb_enable_autosuspend(hdev); |
| 1783 | } else { /* root hub */ |
| 1784 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; |
| 1785 | |
| 1786 | if (drv->bus_suspend && drv->bus_resume) |
| 1787 | usb_enable_autosuspend(hdev); |
| 1788 | } |
Alan Stern | 088f7fe | 2010-01-08 12:56:54 -0500 | [diff] [blame] | 1789 | |
Felipe Balbi | 38f3ad5 | 2008-06-12 10:49:47 +0300 | [diff] [blame] | 1790 | if (hdev->level == MAX_TOPO_LEVEL) { |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 1791 | dev_err(&intf->dev, |
| 1792 | "Unsupported bus topology: hub nested too deep\n"); |
Felipe Balbi | 38f3ad5 | 2008-06-12 10:49:47 +0300 | [diff] [blame] | 1793 | return -E2BIG; |
| 1794 | } |
| 1795 | |
David Brownell | 89ccbdc | 2006-04-02 10:18:09 -0800 | [diff] [blame] | 1796 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
| 1797 | if (hdev->parent) { |
| 1798 | dev_warn(&intf->dev, "ignoring external hub\n"); |
| 1799 | return -ENODEV; |
| 1800 | } |
| 1801 | #endif |
| 1802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
| 1804 | /* specs is not defined, but it works */ |
| 1805 | if ((desc->desc.bInterfaceSubClass != 0) && |
| 1806 | (desc->desc.bInterfaceSubClass != 1)) { |
| 1807 | descriptor_error: |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1808 | dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | return -EIO; |
| 1810 | } |
| 1811 | |
| 1812 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
| 1813 | if (desc->desc.bNumEndpoints != 1) |
| 1814 | goto descriptor_error; |
| 1815 | |
| 1816 | endpoint = &desc->endpoint[0].desc; |
| 1817 | |
Luiz Fernando N. Capitulino | fbf81c2 | 2006-09-27 11:58:53 -0700 | [diff] [blame] | 1818 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
| 1819 | if (!usb_endpoint_is_int_in(endpoint)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | goto descriptor_error; |
| 1821 | |
| 1822 | /* We found a hub */ |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1823 | dev_info(&intf->dev, "USB hub found\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | |
Alan Stern | 0a1ef3b | 2005-10-24 15:38:24 -0400 | [diff] [blame] | 1825 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | if (!hub) { |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1827 | dev_dbg(&intf->dev, "couldn't kmalloc hub struct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | return -ENOMEM; |
| 1829 | } |
| 1830 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1831 | kref_init(&hub->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | hub->intfdev = &intf->dev; |
| 1833 | hub->hdev = hdev; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1834 | INIT_DELAYED_WORK(&hub->leds, led_work); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1835 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 1836 | INIT_WORK(&hub->events, hub_event); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1837 | usb_get_intf(intf); |
Petr Mladek | 5d14f32 | 2014-09-19 17:32:19 +0200 | [diff] [blame] | 1838 | usb_get_dev(hdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1840 | usb_set_intfdata(intf, hub); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 1841 | intf->needs_remote_wakeup = 1; |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 1842 | pm_suspend_ignore_children(&intf->dev, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | if (hdev->speed == USB_SPEED_HIGH) |
| 1845 | highspeed_hubs++; |
| 1846 | |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 1847 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
| 1848 | hub->quirk_check_port_auto_suspend = 1; |
| 1849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | if (hub_configure(hub, endpoint) >= 0) |
| 1851 | return 0; |
| 1852 | |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1853 | hub_disconnect(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | return -ENODEV; |
| 1855 | } |
| 1856 | |
| 1857 | static int |
| 1858 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
| 1859 | { |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 1860 | struct usb_device *hdev = interface_to_usbdev(intf); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1861 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | |
| 1863 | /* assert ifno == 0 (part of hub spec) */ |
| 1864 | switch (code) { |
| 1865 | case USBDEVFS_HUB_PORTINFO: { |
| 1866 | struct usbdevfs_hub_portinfo *info = user_data; |
| 1867 | int i; |
| 1868 | |
| 1869 | spin_lock_irq(&device_state_lock); |
| 1870 | if (hdev->devnum <= 0) |
| 1871 | info->nports = 0; |
| 1872 | else { |
| 1873 | info->nports = hdev->maxchild; |
| 1874 | for (i = 0; i < info->nports; i++) { |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 1875 | if (hub->ports[i]->child == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | info->port[i] = 0; |
| 1877 | else |
| 1878 | info->port[i] = |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 1879 | hub->ports[i]->child->devnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | } |
| 1881 | } |
| 1882 | spin_unlock_irq(&device_state_lock); |
| 1883 | |
| 1884 | return info->nports + 1; |
| 1885 | } |
| 1886 | |
| 1887 | default: |
| 1888 | return -ENOSYS; |
| 1889 | } |
| 1890 | } |
| 1891 | |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1892 | /* |
| 1893 | * Allow user programs to claim ports on a hub. When a device is attached |
| 1894 | * to one of these "claimed" ports, the program will "own" the device. |
| 1895 | */ |
| 1896 | static int find_port_owner(struct usb_device *hdev, unsigned port1, |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1897 | struct usb_dev_state ***ppowner) |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1898 | { |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 1899 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
| 1900 | |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1901 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 1902 | return -ENODEV; |
| 1903 | if (port1 == 0 || port1 > hdev->maxchild) |
| 1904 | return -EINVAL; |
| 1905 | |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 1906 | /* Devices not managed by the hub driver |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1907 | * will always have maxchild equal to 0. |
| 1908 | */ |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 1909 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1910 | return 0; |
| 1911 | } |
| 1912 | |
| 1913 | /* In the following three functions, the caller must hold hdev's lock */ |
Lan Tianyu | 336c5c3 | 2012-07-06 14:13:52 +0800 | [diff] [blame] | 1914 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1915 | struct usb_dev_state *owner) |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1916 | { |
| 1917 | int rc; |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1918 | struct usb_dev_state **powner; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1919 | |
| 1920 | rc = find_port_owner(hdev, port1, &powner); |
| 1921 | if (rc) |
| 1922 | return rc; |
| 1923 | if (*powner) |
| 1924 | return -EBUSY; |
| 1925 | *powner = owner; |
| 1926 | return rc; |
| 1927 | } |
Valentina Manea | 6080cd0 | 2014-03-08 14:53:34 +0200 | [diff] [blame] | 1928 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1929 | |
Lan Tianyu | 336c5c3 | 2012-07-06 14:13:52 +0800 | [diff] [blame] | 1930 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1931 | struct usb_dev_state *owner) |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1932 | { |
| 1933 | int rc; |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1934 | struct usb_dev_state **powner; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1935 | |
| 1936 | rc = find_port_owner(hdev, port1, &powner); |
| 1937 | if (rc) |
| 1938 | return rc; |
| 1939 | if (*powner != owner) |
| 1940 | return -ENOENT; |
| 1941 | *powner = NULL; |
| 1942 | return rc; |
| 1943 | } |
Valentina Manea | 6080cd0 | 2014-03-08 14:53:34 +0200 | [diff] [blame] | 1944 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1945 | |
Valentina Manea | 9b6f0c4 | 2014-03-10 10:36:40 +0200 | [diff] [blame] | 1946 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1947 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1948 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1949 | int n; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1950 | |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1951 | for (n = 0; n < hdev->maxchild; n++) { |
| 1952 | if (hub->ports[n]->port_owner == owner) |
| 1953 | hub->ports[n]->port_owner = NULL; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1954 | } |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1955 | |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1956 | } |
| 1957 | |
| 1958 | /* The caller must hold udev's lock */ |
| 1959 | bool usb_device_is_owned(struct usb_device *udev) |
| 1960 | { |
| 1961 | struct usb_hub *hub; |
| 1962 | |
| 1963 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) |
| 1964 | return false; |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1965 | hub = usb_hub_to_struct_hub(udev->parent); |
Lan Tianyu | fa2a956 | 2012-09-05 13:44:31 +0800 | [diff] [blame] | 1966 | return !!hub->ports[udev->portnum - 1]->port_owner; |
Alan Stern | 7cbe5dc | 2009-06-29 10:56:54 -0400 | [diff] [blame] | 1967 | } |
| 1968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
| 1970 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 1971 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | int i; |
| 1973 | |
| 1974 | for (i = 0; i < udev->maxchild; ++i) { |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 1975 | if (hub->ports[i]->child) |
| 1976 | recursively_mark_NOTATTACHED(hub->ports[i]->child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | } |
Alan Stern | 9bbdf1e | 2010-01-08 12:57:28 -0500 | [diff] [blame] | 1978 | if (udev->state == USB_STATE_SUSPENDED) |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 1979 | udev->active_duration -= jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | udev->state = USB_STATE_NOTATTACHED; |
| 1981 | } |
| 1982 | |
| 1983 | /** |
| 1984 | * usb_set_device_state - change a device's current state (usbcore, hcds) |
| 1985 | * @udev: pointer to device whose state should be changed |
| 1986 | * @new_state: new state value to be stored |
| 1987 | * |
| 1988 | * udev->state is _not_ fully protected by the device lock. Although |
| 1989 | * most transitions are made only while holding the lock, the state can |
| 1990 | * can change to USB_STATE_NOTATTACHED at almost any time. This |
| 1991 | * is so that devices can be marked as disconnected as soon as possible, |
| 1992 | * without having to wait for any semaphores to be released. As a result, |
| 1993 | * all changes to any device's state must be protected by the |
| 1994 | * device_state_lock spinlock. |
| 1995 | * |
| 1996 | * Once a device has been added to the device tree, all changes to its state |
| 1997 | * should be made using this routine. The state should _not_ be set directly. |
| 1998 | * |
| 1999 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
| 2000 | * Otherwise udev->state is set to new_state, and if new_state is |
| 2001 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
| 2002 | * to USB_STATE_NOTATTACHED. |
| 2003 | */ |
| 2004 | void usb_set_device_state(struct usb_device *udev, |
| 2005 | enum usb_device_state new_state) |
| 2006 | { |
| 2007 | unsigned long flags; |
Rafael J. Wysocki | 4681b17 | 2011-02-08 23:25:48 +0100 | [diff] [blame] | 2008 | int wakeup = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | |
| 2010 | spin_lock_irqsave(&device_state_lock, flags); |
| 2011 | if (udev->state == USB_STATE_NOTATTACHED) |
| 2012 | ; /* do nothing */ |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 2013 | else if (new_state != USB_STATE_NOTATTACHED) { |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 2014 | |
| 2015 | /* root hub wakeup capabilities are managed out-of-band |
| 2016 | * and may involve silicon errata ... ignore them here. |
| 2017 | */ |
| 2018 | if (udev->parent) { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 2019 | if (udev->state == USB_STATE_SUSPENDED |
| 2020 | || new_state == USB_STATE_SUSPENDED) |
| 2021 | ; /* No change to wakeup settings */ |
| 2022 | else if (new_state == USB_STATE_CONFIGURED) |
Lu Baolu | ddbe1fc | 2014-09-19 10:13:50 +0800 | [diff] [blame] | 2023 | wakeup = (udev->quirks & |
| 2024 | USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : |
| 2025 | udev->actconfig->desc.bmAttributes & |
| 2026 | USB_CONFIG_ATT_WAKEUP; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 2027 | else |
Rafael J. Wysocki | 4681b17 | 2011-02-08 23:25:48 +0100 | [diff] [blame] | 2028 | wakeup = 0; |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 2029 | } |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 2030 | if (udev->state == USB_STATE_SUSPENDED && |
| 2031 | new_state != USB_STATE_SUSPENDED) |
| 2032 | udev->active_duration -= jiffies; |
| 2033 | else if (new_state == USB_STATE_SUSPENDED && |
| 2034 | udev->state != USB_STATE_SUSPENDED) |
| 2035 | udev->active_duration += jiffies; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 2036 | udev->state = new_state; |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 2037 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | recursively_mark_NOTATTACHED(udev); |
| 2039 | spin_unlock_irqrestore(&device_state_lock, flags); |
Rafael J. Wysocki | 4681b17 | 2011-02-08 23:25:48 +0100 | [diff] [blame] | 2040 | if (wakeup >= 0) |
| 2041 | device_set_wakeup_capable(&udev->dev, wakeup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | } |
David Vrabel | 6da9c99 | 2009-02-18 14:43:47 +0000 | [diff] [blame] | 2043 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2045 | /* |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2046 | * Choose a device number. |
| 2047 | * |
| 2048 | * Device numbers are used as filenames in usbfs. On USB-1.1 and |
| 2049 | * USB-2.0 buses they are also used as device addresses, however on |
| 2050 | * USB-3.0 buses the address is assigned by the controller hardware |
| 2051 | * and it usually is not the same as the device number. |
| 2052 | * |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2053 | * WUSB devices are simple: they have no hubs behind, so the mapping |
| 2054 | * device <-> virtual port number becomes 1:1. Why? to simplify the |
| 2055 | * life of the device connection logic in |
| 2056 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret |
| 2057 | * handshake we need to assign a temporary address in the unauthorized |
| 2058 | * space. For simplicity we use the first virtual port number found to |
| 2059 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] |
| 2060 | * and that becomes it's address [X < 128] or its unauthorized address |
| 2061 | * [X | 0x80]. |
| 2062 | * |
| 2063 | * We add 1 as an offset to the one-based USB-stack port number |
| 2064 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr |
| 2065 | * 0 is reserved by USB for default address; (b) Linux's USB stack |
| 2066 | * uses always #1 for the root hub of the controller. So USB stack's |
| 2067 | * port #1, which is wusb virtual-port #0 has address #2. |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2068 | * |
| 2069 | * Devices connected under xHCI are not as simple. The host controller |
| 2070 | * supports virtualization, so the hardware assigns device addresses and |
| 2071 | * the HCD must setup data structures before issuing a set address |
| 2072 | * command to the hardware. |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2073 | */ |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2074 | static void choose_devnum(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | { |
| 2076 | int devnum; |
| 2077 | struct usb_bus *bus = udev->bus; |
| 2078 | |
Petr Mladek | 638139e | 2014-09-19 17:32:24 +0200 | [diff] [blame] | 2079 | /* be safe when more hub events are proceed in parallel */ |
Chris Bainbridge | feb26ac | 2016-04-25 13:48:38 +0100 | [diff] [blame] | 2080 | mutex_lock(&bus->devnum_next_mutex); |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2081 | if (udev->wusb) { |
| 2082 | devnum = udev->portnum + 1; |
| 2083 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); |
| 2084 | } else { |
| 2085 | /* Try to allocate the next devnum beginning at |
| 2086 | * bus->devnum_next. */ |
| 2087 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
| 2088 | bus->devnum_next); |
| 2089 | if (devnum >= 128) |
| 2090 | devnum = find_next_zero_bit(bus->devmap.devicemap, |
| 2091 | 128, 1); |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 2092 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2093 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | if (devnum < 128) { |
| 2095 | set_bit(devnum, bus->devmap.devicemap); |
| 2096 | udev->devnum = devnum; |
| 2097 | } |
Chris Bainbridge | feb26ac | 2016-04-25 13:48:38 +0100 | [diff] [blame] | 2098 | mutex_unlock(&bus->devnum_next_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | } |
| 2100 | |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2101 | static void release_devnum(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | { |
| 2103 | if (udev->devnum > 0) { |
| 2104 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
| 2105 | udev->devnum = -1; |
| 2106 | } |
| 2107 | } |
| 2108 | |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2109 | static void update_devnum(struct usb_device *udev, int devnum) |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2110 | { |
| 2111 | /* The address for a WUSB device is managed by wusbcore. */ |
| 2112 | if (!udev->wusb) |
| 2113 | udev->devnum = devnum; |
| 2114 | } |
| 2115 | |
Herbert Xu | f7410ce | 2010-01-10 20:15:03 +1100 | [diff] [blame] | 2116 | static void hub_free_dev(struct usb_device *udev) |
| 2117 | { |
| 2118 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 2119 | |
| 2120 | /* Root hubs aren't real devices, so don't free HCD resources */ |
| 2121 | if (hcd->driver->free_dev && udev->parent) |
| 2122 | hcd->driver->free_dev(hcd, udev); |
| 2123 | } |
| 2124 | |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2125 | static void hub_disconnect_children(struct usb_device *udev) |
| 2126 | { |
| 2127 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
| 2128 | int i; |
| 2129 | |
| 2130 | /* Free up all the children before we remove this device */ |
| 2131 | for (i = 0; i < udev->maxchild; i++) { |
| 2132 | if (hub->ports[i]->child) |
| 2133 | usb_disconnect(&hub->ports[i]->child); |
| 2134 | } |
| 2135 | } |
| 2136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | /** |
| 2138 | * usb_disconnect - disconnect a device (usbcore-internal) |
| 2139 | * @pdev: pointer to device being disconnected |
| 2140 | * Context: !in_interrupt () |
| 2141 | * |
| 2142 | * Something got disconnected. Get rid of it and all of its children. |
| 2143 | * |
| 2144 | * If *pdev is a normal device then the parent hub must already be locked. |
Heiner Kallweit | a4b5d60 | 2016-02-03 23:35:23 +0100 | [diff] [blame] | 2145 | * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, |
Bjorn Helgaas | db8f2aa | 2013-09-13 13:57:34 -0600 | [diff] [blame] | 2146 | * which protects the set of root hubs as well as the list of buses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | * |
| 2148 | * Only hub drivers (including virtual root hub drivers for host |
| 2149 | * controllers) should ever call this. |
| 2150 | * |
| 2151 | * This call is synchronous, and may not be used in an interrupt context. |
| 2152 | */ |
| 2153 | void usb_disconnect(struct usb_device **pdev) |
| 2154 | { |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2155 | struct usb_port *port_dev = NULL; |
| 2156 | struct usb_device *udev = *pdev; |
Peter Chen | 5b1dc20 | 2014-08-19 08:56:21 +0800 | [diff] [blame] | 2157 | struct usb_hub *hub = NULL; |
| 2158 | int port1 = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | /* mark the device as inactive, so any further urb submissions for |
| 2161 | * this device (and any of its children) will fail immediately. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2162 | * this quiesces everything except pending urbs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | */ |
| 2164 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2165 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
| 2166 | udev->devnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 2168 | usb_lock_device(udev); |
| 2169 | |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2170 | hub_disconnect_children(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | |
| 2172 | /* deallocate hcd/hardware state ... nuking all pending urbs and |
| 2173 | * cleaning up all state associated with the current configuration |
| 2174 | * so that the hardware is now fully quiesced. |
| 2175 | */ |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 2176 | dev_dbg(&udev->dev, "unregistering device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | usb_disable_device(udev, 0); |
Alan Stern | cde217a | 2008-10-21 15:28:46 -0400 | [diff] [blame] | 2178 | usb_hcd_synchronize_unlinks(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2180 | if (udev->parent) { |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2181 | port1 = udev->portnum; |
| 2182 | hub = usb_hub_to_struct_hub(udev->parent); |
| 2183 | port_dev = hub->ports[port1 - 1]; |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2184 | |
| 2185 | sysfs_remove_link(&udev->dev.kobj, "port"); |
| 2186 | sysfs_remove_link(&port_dev->dev.kobj, "device"); |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 2187 | |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2188 | /* |
| 2189 | * As usb_port_runtime_resume() de-references udev, make |
| 2190 | * sure no resumes occur during removal |
| 2191 | */ |
| 2192 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
| 2193 | pm_runtime_get_sync(&port_dev->dev); |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2194 | } |
| 2195 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 2196 | usb_remove_ep_devs(&udev->ep0); |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2197 | usb_unlock_device(udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2198 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2199 | /* Unregister the device. The device driver is responsible |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 2200 | * for de-configuring the device and invoking the remove-device |
| 2201 | * notifier chain (used by usbfs and possibly others). |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2202 | */ |
| 2203 | device_del(&udev->dev); |
| 2204 | |
| 2205 | /* Free the device number and delete the parent's children[] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | * (or root_hub) pointer. |
| 2207 | */ |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 2208 | release_devnum(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
| 2210 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
| 2211 | spin_lock_irq(&device_state_lock); |
| 2212 | *pdev = NULL; |
| 2213 | spin_unlock_irq(&device_state_lock); |
| 2214 | |
Dan Williams | 7027df3 | 2014-05-20 18:09:36 -0700 | [diff] [blame] | 2215 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
| 2216 | pm_runtime_put(&port_dev->dev); |
| 2217 | |
Herbert Xu | f7410ce | 2010-01-10 20:15:03 +1100 | [diff] [blame] | 2218 | hub_free_dev(udev); |
| 2219 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2220 | put_device(&udev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | } |
| 2222 | |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 2223 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | static void show_string(struct usb_device *udev, char *id, char *string) |
| 2225 | { |
| 2226 | if (!string) |
| 2227 | return; |
Joe Perches | f2ec522 | 2012-10-28 01:05:51 -0700 | [diff] [blame] | 2228 | dev_info(&udev->dev, "%s: %s\n", id, string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | } |
| 2230 | |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 2231 | static void announce_device(struct usb_device *udev) |
| 2232 | { |
| 2233 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", |
| 2234 | le16_to_cpu(udev->descriptor.idVendor), |
| 2235 | le16_to_cpu(udev->descriptor.idProduct)); |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2236 | dev_info(&udev->dev, |
| 2237 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 2238 | udev->descriptor.iManufacturer, |
| 2239 | udev->descriptor.iProduct, |
| 2240 | udev->descriptor.iSerialNumber); |
| 2241 | show_string(udev, "Product", udev->product); |
| 2242 | show_string(udev, "Manufacturer", udev->manufacturer); |
| 2243 | show_string(udev, "SerialNumber", udev->serial); |
| 2244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | #else |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 2246 | static inline void announce_device(struct usb_device *udev) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | #endif |
| 2248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 2250 | /** |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2251 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 2252 | * @udev: newly addressed device (in ADDRESS state) |
| 2253 | * |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2254 | * Finish enumeration for On-The-Go devices |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 2255 | * |
| 2256 | * Return: 0 if successful. A negative error code otherwise. |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 2257 | */ |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2258 | static int usb_enumerate_device_otg(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | { |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2260 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
| 2262 | #ifdef CONFIG_USB_OTG |
| 2263 | /* |
| 2264 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
| 2265 | * to wake us after we've powered off VBUS; and HNP, switching roles |
| 2266 | * "host" to "peripheral". The OTG descriptor helps figure this out. |
| 2267 | */ |
| 2268 | if (!udev->bus->is_b_host |
| 2269 | && udev->config |
| 2270 | && udev->parent == udev->bus->root_hub) { |
Felipe Balbi | 2eb5052 | 2009-12-04 15:47:43 +0200 | [diff] [blame] | 2271 | struct usb_otg_descriptor *desc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | struct usb_bus *bus = udev->bus; |
Li Jun | 7d2d641 | 2015-08-31 16:20:49 +0800 | [diff] [blame] | 2273 | unsigned port1 = udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | |
| 2275 | /* descriptor may appear anywhere in config */ |
Li Jun | 7d2d641 | 2015-08-31 16:20:49 +0800 | [diff] [blame] | 2276 | err = __usb_get_extra_descriptor(udev->rawdescriptors[0], |
| 2277 | le16_to_cpu(udev->config[0].desc.wTotalLength), |
| 2278 | USB_DT_OTG, (void **) &desc); |
| 2279 | if (err || !(desc->bmAttributes & USB_OTG_HNP)) |
| 2280 | return 0; |
David Brownell | fc849b8 | 2006-09-18 16:53:26 -0700 | [diff] [blame] | 2281 | |
Li Jun | 7d2d641 | 2015-08-31 16:20:49 +0800 | [diff] [blame] | 2282 | dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", |
| 2283 | (port1 == bus->otg_port) ? "" : "non-"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | |
Li Jun | 7d2d641 | 2015-08-31 16:20:49 +0800 | [diff] [blame] | 2285 | /* enable HNP before suspend, it's simpler */ |
| 2286 | if (port1 == bus->otg_port) { |
| 2287 | bus->b_hnp_enable = 1; |
| 2288 | err = usb_control_msg(udev, |
| 2289 | usb_sndctrlpipe(udev, 0), |
| 2290 | USB_REQ_SET_FEATURE, 0, |
| 2291 | USB_DEVICE_B_HNP_ENABLE, |
| 2292 | 0, NULL, 0, |
| 2293 | USB_CTRL_SET_TIMEOUT); |
| 2294 | if (err < 0) { |
| 2295 | /* |
| 2296 | * OTG MESSAGE: report errors here, |
| 2297 | * customize to match your product. |
| 2298 | */ |
| 2299 | dev_err(&udev->dev, "can't set HNP mode: %d\n", |
| 2300 | err); |
| 2301 | bus->b_hnp_enable = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | } |
Li Jun | 7d2d641 | 2015-08-31 16:20:49 +0800 | [diff] [blame] | 2303 | } else if (desc->bLength == sizeof |
| 2304 | (struct usb_otg_descriptor)) { |
| 2305 | /* Set a_alt_hnp_support for legacy otg device */ |
| 2306 | err = usb_control_msg(udev, |
| 2307 | usb_sndctrlpipe(udev, 0), |
| 2308 | USB_REQ_SET_FEATURE, 0, |
| 2309 | USB_DEVICE_A_ALT_HNP_SUPPORT, |
| 2310 | 0, NULL, 0, |
| 2311 | USB_CTRL_SET_TIMEOUT); |
| 2312 | if (err < 0) |
| 2313 | dev_err(&udev->dev, |
| 2314 | "set a_alt_hnp_support failed: %d\n", |
| 2315 | err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | } |
| 2317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | #endif |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2319 | return err; |
| 2320 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2322 | |
| 2323 | /** |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2324 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2325 | * @udev: newly addressed device (in ADDRESS state) |
| 2326 | * |
| 2327 | * This is only called by usb_new_device() and usb_authorize_device() |
| 2328 | * and FIXME -- all comments that apply to them apply here wrt to |
| 2329 | * environment. |
| 2330 | * |
| 2331 | * If the device is WUSB and not authorized, we don't attempt to read |
| 2332 | * the string descriptors, as they will be errored out by the device |
| 2333 | * until it has been authorized. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 2334 | * |
| 2335 | * Return: 0 if successful. A negative error code otherwise. |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2336 | */ |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2337 | static int usb_enumerate_device(struct usb_device *udev) |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2338 | { |
| 2339 | int err; |
Peter Chen | 026f3fc | 2014-08-19 09:51:53 +0800 | [diff] [blame] | 2340 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2341 | |
| 2342 | if (udev->config == NULL) { |
| 2343 | err = usb_get_configuration(udev); |
| 2344 | if (err < 0) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 2345 | if (err != -ENODEV) |
| 2346 | dev_err(&udev->dev, "can't read configurations, error %d\n", |
| 2347 | err); |
Laurent Pinchart | 80da2e0 | 2012-07-19 12:39:13 +0200 | [diff] [blame] | 2348 | return err; |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2349 | } |
| 2350 | } |
Thomas Pugliese | 83e83ec | 2013-12-09 13:40:29 -0600 | [diff] [blame] | 2351 | |
| 2352 | /* read the standard strings and cache them if present */ |
| 2353 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
| 2354 | udev->manufacturer = usb_cache_string(udev, |
| 2355 | udev->descriptor.iManufacturer); |
| 2356 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
| 2357 | |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2358 | err = usb_enumerate_device_otg(udev); |
Laurent Pinchart | 80da2e0 | 2012-07-19 12:39:13 +0200 | [diff] [blame] | 2359 | if (err < 0) |
| 2360 | return err; |
| 2361 | |
Peter Chen | 026f3fc | 2014-08-19 09:51:53 +0800 | [diff] [blame] | 2362 | if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && |
Peter Chen | e5a9d62 | 2014-09-29 10:09:31 +0800 | [diff] [blame] | 2363 | !is_targeted(udev)) { |
Peter Chen | 026f3fc | 2014-08-19 09:51:53 +0800 | [diff] [blame] | 2364 | /* Maybe it can talk to us, though we can't talk to it. |
| 2365 | * (Includes HNP test device.) |
| 2366 | */ |
Peter Chen | e5a9d62 | 2014-09-29 10:09:31 +0800 | [diff] [blame] | 2367 | if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable |
| 2368 | || udev->bus->is_b_host)) { |
Peter Chen | 026f3fc | 2014-08-19 09:51:53 +0800 | [diff] [blame] | 2369 | err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); |
| 2370 | if (err < 0) |
| 2371 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
| 2372 | } |
| 2373 | return -ENOTSUPP; |
| 2374 | } |
| 2375 | |
Laurent Pinchart | 80da2e0 | 2012-07-19 12:39:13 +0200 | [diff] [blame] | 2376 | usb_detect_interface_quirks(udev); |
| 2377 | |
| 2378 | return 0; |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2379 | } |
| 2380 | |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2381 | static void set_usb_port_removable(struct usb_device *udev) |
| 2382 | { |
| 2383 | struct usb_device *hdev = udev->parent; |
| 2384 | struct usb_hub *hub; |
| 2385 | u8 port = udev->portnum; |
| 2386 | u16 wHubCharacteristics; |
| 2387 | bool removable = true; |
| 2388 | |
| 2389 | if (!hdev) |
| 2390 | return; |
| 2391 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 2392 | hub = usb_hub_to_struct_hub(udev->parent); |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2393 | |
Matthew Garrett | 92bfbf7 | 2015-04-08 16:36:00 -0700 | [diff] [blame] | 2394 | /* |
| 2395 | * If the platform firmware has provided information about a port, |
| 2396 | * use that to determine whether it's removable. |
| 2397 | */ |
| 2398 | switch (hub->ports[udev->portnum - 1]->connect_type) { |
| 2399 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: |
| 2400 | udev->removable = USB_DEVICE_REMOVABLE; |
| 2401 | return; |
| 2402 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: |
Matthew Garrett | 58339c2 | 2015-04-08 16:36:01 -0700 | [diff] [blame] | 2403 | case USB_PORT_NOT_USED: |
Matthew Garrett | 92bfbf7 | 2015-04-08 16:36:00 -0700 | [diff] [blame] | 2404 | udev->removable = USB_DEVICE_FIXED; |
| 2405 | return; |
Matthew Garrett | 58339c2 | 2015-04-08 16:36:01 -0700 | [diff] [blame] | 2406 | default: |
| 2407 | break; |
Matthew Garrett | 92bfbf7 | 2015-04-08 16:36:00 -0700 | [diff] [blame] | 2408 | } |
| 2409 | |
| 2410 | /* |
| 2411 | * Otherwise, check whether the hub knows whether a port is removable |
| 2412 | * or not |
| 2413 | */ |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2414 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
| 2415 | |
| 2416 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) |
| 2417 | return; |
| 2418 | |
| 2419 | if (hub_is_superspeed(hdev)) { |
Lan Tianyu | ca3c153 | 2012-09-11 04:22:36 +0800 | [diff] [blame] | 2420 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
| 2421 | & (1 << port)) |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2422 | removable = false; |
| 2423 | } else { |
| 2424 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) |
| 2425 | removable = false; |
| 2426 | } |
| 2427 | |
| 2428 | if (removable) |
| 2429 | udev->removable = USB_DEVICE_REMOVABLE; |
| 2430 | else |
| 2431 | udev->removable = USB_DEVICE_FIXED; |
Dan Williams | a4204ff | 2014-05-20 18:08:22 -0700 | [diff] [blame] | 2432 | |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2433 | } |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2434 | |
| 2435 | /** |
| 2436 | * usb_new_device - perform initial device setup (usbcore-internal) |
| 2437 | * @udev: newly addressed device (in ADDRESS state) |
| 2438 | * |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2439 | * This is called with devices which have been detected but not fully |
| 2440 | * enumerated. The device descriptor is available, but not descriptors |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2441 | * for any device configuration. The caller must have locked either |
| 2442 | * the parent hub (if udev is a normal device) or else the |
Heiner Kallweit | a4b5d60 | 2016-02-03 23:35:23 +0100 | [diff] [blame] | 2443 | * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2444 | * udev has already been installed, but udev is not yet visible through |
| 2445 | * sysfs or other filesystem code. |
| 2446 | * |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2447 | * This call is synchronous, and may not be used in an interrupt context. |
| 2448 | * |
| 2449 | * Only the hub driver or root-hub registrar should ever call this. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 2450 | * |
| 2451 | * Return: Whether the device is configured properly or not. Zero if the |
| 2452 | * interface was registered with the driver core; else a negative errno |
| 2453 | * value. |
| 2454 | * |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2455 | */ |
| 2456 | int usb_new_device(struct usb_device *udev) |
| 2457 | { |
| 2458 | int err; |
| 2459 | |
Dan Streetman | 1698540 | 2010-01-06 09:56:53 -0500 | [diff] [blame] | 2460 | if (udev->parent) { |
Dan Streetman | 1698540 | 2010-01-06 09:56:53 -0500 | [diff] [blame] | 2461 | /* Initialize non-root-hub device wakeup to disabled; |
| 2462 | * device (un)configuration controls wakeup capable |
| 2463 | * sysfs power/wakeup controls wakeup enabled/disabled |
| 2464 | */ |
| 2465 | device_init_wakeup(&udev->dev, 0); |
Dan Streetman | 1698540 | 2010-01-06 09:56:53 -0500 | [diff] [blame] | 2466 | } |
| 2467 | |
Alan Stern | 9bbdf1e | 2010-01-08 12:57:28 -0500 | [diff] [blame] | 2468 | /* Tell the runtime-PM framework the device is active */ |
| 2469 | pm_runtime_set_active(&udev->dev); |
Alan Stern | c08512c | 2010-11-15 15:57:58 -0500 | [diff] [blame] | 2470 | pm_runtime_get_noresume(&udev->dev); |
Alan Stern | fcc4a01 | 2010-11-15 15:57:51 -0500 | [diff] [blame] | 2471 | pm_runtime_use_autosuspend(&udev->dev); |
Alan Stern | 9bbdf1e | 2010-01-08 12:57:28 -0500 | [diff] [blame] | 2472 | pm_runtime_enable(&udev->dev); |
| 2473 | |
Alan Stern | c08512c | 2010-11-15 15:57:58 -0500 | [diff] [blame] | 2474 | /* By default, forbid autosuspend for all devices. It will be |
| 2475 | * allowed for hubs during binding. |
| 2476 | */ |
| 2477 | usb_disable_autosuspend(udev); |
| 2478 | |
Alan Stern | 8d8558d | 2009-12-08 15:50:41 -0500 | [diff] [blame] | 2479 | err = usb_enumerate_device(udev); /* Read descriptors */ |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2480 | if (err < 0) |
| 2481 | goto fail; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2482 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
| 2483 | udev->devnum, udev->bus->busnum, |
| 2484 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 2485 | /* export the usbdev device-node for libusb */ |
| 2486 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, |
| 2487 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| 2488 | |
Alan Stern | 6cd1320 | 2008-11-13 15:08:30 -0500 | [diff] [blame] | 2489 | /* Tell the world! */ |
| 2490 | announce_device(udev); |
Alan Stern | 195af2c | 2007-07-16 15:28:19 -0400 | [diff] [blame] | 2491 | |
Theodore Ts'o | b04b315 | 2012-07-04 11:22:20 -0400 | [diff] [blame] | 2492 | if (udev->serial) |
| 2493 | add_device_randomness(udev->serial, strlen(udev->serial)); |
| 2494 | if (udev->product) |
| 2495 | add_device_randomness(udev->product, strlen(udev->product)); |
| 2496 | if (udev->manufacturer) |
| 2497 | add_device_randomness(udev->manufacturer, |
| 2498 | strlen(udev->manufacturer)); |
| 2499 | |
Rafael J. Wysocki | 927bc91 | 2010-02-08 19:18:16 +0100 | [diff] [blame] | 2500 | device_enable_async_suspend(&udev->dev); |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2501 | |
Dan Williams | a4204ff | 2014-05-20 18:08:22 -0700 | [diff] [blame] | 2502 | /* check whether the hub or firmware marks this port as non-removable */ |
Matthew Garrett | d35e70d | 2012-02-03 17:11:55 -0500 | [diff] [blame] | 2503 | if (udev->parent) |
| 2504 | set_usb_port_removable(udev); |
| 2505 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2506 | /* Register the device. The device driver is responsible |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 2507 | * for configuring the device and invoking the add-device |
| 2508 | * notifier chain (used by usbfs and possibly others). |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 2509 | */ |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 2510 | err = device_add(&udev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2511 | if (err) { |
| 2512 | dev_err(&udev->dev, "can't device_add, error %d\n", err); |
| 2513 | goto fail; |
| 2514 | } |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 2515 | |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2516 | /* Create link files between child device and usb port device. */ |
| 2517 | if (udev->parent) { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 2518 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 2519 | int port1 = udev->portnum; |
| 2520 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2521 | |
| 2522 | err = sysfs_create_link(&udev->dev.kobj, |
| 2523 | &port_dev->dev.kobj, "port"); |
| 2524 | if (err) |
| 2525 | goto fail; |
| 2526 | |
| 2527 | err = sysfs_create_link(&port_dev->dev.kobj, |
| 2528 | &udev->dev.kobj, "device"); |
| 2529 | if (err) { |
| 2530 | sysfs_remove_link(&udev->dev.kobj, "port"); |
| 2531 | goto fail; |
| 2532 | } |
Lan Tianyu | 971fcd4 | 2013-01-23 04:26:29 +0800 | [diff] [blame] | 2533 | |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 2534 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
| 2535 | pm_runtime_get_sync(&port_dev->dev); |
Lan Tianyu | fde2638 | 2013-01-20 01:53:33 +0800 | [diff] [blame] | 2536 | } |
| 2537 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 2538 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
Alan Stern | c08512c | 2010-11-15 15:57:58 -0500 | [diff] [blame] | 2539 | usb_mark_last_busy(udev); |
| 2540 | pm_runtime_put_sync_autosuspend(&udev->dev); |
Greg Kroah-Hartman | c066475 | 2006-08-11 01:55:12 -0700 | [diff] [blame] | 2541 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | |
| 2543 | fail: |
| 2544 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
Alan Stern | 9bbdf1e | 2010-01-08 12:57:28 -0500 | [diff] [blame] | 2545 | pm_runtime_disable(&udev->dev); |
| 2546 | pm_runtime_set_suspended(&udev->dev); |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 2547 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2548 | } |
| 2549 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2550 | |
| 2551 | /** |
Randy Dunlap | fd39c86 | 2007-10-15 17:30:02 -0700 | [diff] [blame] | 2552 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
| 2553 | * @usb_dev: USB device |
| 2554 | * |
| 2555 | * Move the USB device to a very basic state where interfaces are disabled |
| 2556 | * and the device is in fact unconfigured and unusable. |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2557 | * |
| 2558 | * We share a lock (that we have) with device_del(), so we need to |
| 2559 | * defer its call. |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 2560 | * |
| 2561 | * Return: 0. |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2562 | */ |
| 2563 | int usb_deauthorize_device(struct usb_device *usb_dev) |
| 2564 | { |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2565 | usb_lock_device(usb_dev); |
| 2566 | if (usb_dev->authorized == 0) |
| 2567 | goto out_unauthorized; |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2568 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2569 | usb_dev->authorized = 0; |
| 2570 | usb_set_configuration(usb_dev, -1); |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2571 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2572 | out_unauthorized: |
| 2573 | usb_unlock_device(usb_dev); |
| 2574 | return 0; |
| 2575 | } |
| 2576 | |
| 2577 | |
| 2578 | int usb_authorize_device(struct usb_device *usb_dev) |
| 2579 | { |
| 2580 | int result = 0, c; |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2581 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2582 | usb_lock_device(usb_dev); |
| 2583 | if (usb_dev->authorized == 1) |
| 2584 | goto out_authorized; |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2585 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2586 | result = usb_autoresume_device(usb_dev); |
| 2587 | if (result < 0) { |
| 2588 | dev_err(&usb_dev->dev, |
| 2589 | "can't autoresume for authorization: %d\n", result); |
| 2590 | goto error_autoresume; |
| 2591 | } |
Josef Gajdusek | e50a322 | 2014-10-09 15:47:54 +0200 | [diff] [blame] | 2592 | |
| 2593 | if (usb_dev->wusb) { |
| 2594 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); |
| 2595 | if (result < 0) { |
| 2596 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " |
| 2597 | "authorization: %d\n", result); |
| 2598 | goto error_device_descriptor; |
| 2599 | } |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2600 | } |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2601 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2602 | usb_dev->authorized = 1; |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2603 | /* Choose and set the configuration. This registers the interfaces |
| 2604 | * with the driver core and lets interface drivers bind to them. |
| 2605 | */ |
Greg Kroah-Hartman | b5ea060 | 2007-08-02 22:44:27 -0600 | [diff] [blame] | 2606 | c = usb_choose_configuration(usb_dev); |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2607 | if (c >= 0) { |
| 2608 | result = usb_set_configuration(usb_dev, c); |
| 2609 | if (result) { |
| 2610 | dev_err(&usb_dev->dev, |
| 2611 | "can't set config #%d, error %d\n", c, result); |
| 2612 | /* This need not be fatal. The user can try to |
| 2613 | * set other configurations. */ |
| 2614 | } |
| 2615 | } |
| 2616 | dev_info(&usb_dev->dev, "authorized to connect\n"); |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2617 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2618 | error_device_descriptor: |
Alan Stern | da30712 | 2009-12-08 15:54:44 -0500 | [diff] [blame] | 2619 | usb_autosuspend_device(usb_dev); |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2620 | error_autoresume: |
| 2621 | out_authorized: |
Matthias Beyer | 781b213 | 2013-10-10 23:41:29 +0200 | [diff] [blame] | 2622 | usb_unlock_device(usb_dev); /* complements locktree */ |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2623 | return result; |
| 2624 | } |
| 2625 | |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 2626 | /* |
| 2627 | * Return 1 if port speed is SuperSpeedPlus, 0 otherwise |
| 2628 | * check it from the link protocol field of the current speed ID attribute. |
| 2629 | * current speed ID is got from ext port status request. Sublink speed attribute |
| 2630 | * table is returned with the hub BOS SSP device capability descriptor |
| 2631 | */ |
| 2632 | static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) |
| 2633 | { |
| 2634 | int ssa_count; |
| 2635 | u32 ss_attr; |
| 2636 | int i; |
| 2637 | struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; |
| 2638 | |
| 2639 | if (!ssp_cap) |
| 2640 | return 0; |
| 2641 | |
| 2642 | ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & |
| 2643 | USB_SSP_SUBLINK_SPEED_ATTRIBS; |
| 2644 | |
| 2645 | for (i = 0; i <= ssa_count; i++) { |
| 2646 | ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); |
| 2647 | if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) |
| 2648 | return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); |
| 2649 | } |
| 2650 | return 0; |
| 2651 | } |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 2652 | |
Inaky Perez-Gonzalez | 0165de0 | 2006-08-25 19:35:29 -0700 | [diff] [blame] | 2653 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
| 2654 | static unsigned hub_is_wusb(struct usb_hub *hub) |
| 2655 | { |
| 2656 | struct usb_hcd *hcd; |
| 2657 | if (hub->hdev->parent != NULL) /* not a root hub? */ |
| 2658 | return 0; |
Geliang Tang | 6ae706a | 2015-12-23 21:26:51 +0800 | [diff] [blame] | 2659 | hcd = bus_to_hcd(hub->hdev->bus); |
Inaky Perez-Gonzalez | 0165de0 | 2006-08-25 19:35:29 -0700 | [diff] [blame] | 2660 | return hcd->wireless; |
| 2661 | } |
| 2662 | |
| 2663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2664 | #define PORT_RESET_TRIES 5 |
| 2665 | #define SET_ADDRESS_TRIES 2 |
| 2666 | #define GET_DESCRIPTOR_TRIES 2 |
| 2667 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 2668 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2669 | |
| 2670 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| 2671 | #define HUB_SHORT_RESET_TIME 10 |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2672 | #define HUB_BH_RESET_TIME 50 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | #define HUB_LONG_RESET_TIME 200 |
Sarah Sharp | 77c7f07 | 2012-11-14 17:16:52 -0800 | [diff] [blame] | 2674 | #define HUB_RESET_TIMEOUT 800 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 2676 | /* |
| 2677 | * "New scheme" enumeration causes an extra state transition to be |
| 2678 | * exposed to an xhci host and causes USB3 devices to receive control |
| 2679 | * commands in the default state. This has been seen to cause |
| 2680 | * enumeration failures, so disable this enumeration scheme for USB3 |
| 2681 | * devices. |
| 2682 | */ |
| 2683 | static bool use_new_scheme(struct usb_device *udev, int retry) |
| 2684 | { |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 2685 | if (udev->speed >= USB_SPEED_SUPER) |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 2686 | return false; |
| 2687 | |
| 2688 | return USE_NEW_SCHEME(retry); |
| 2689 | } |
| 2690 | |
Rahul Bedarkar | 025d443 | 2014-01-04 11:24:41 +0530 | [diff] [blame] | 2691 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
Stanislaw Ledwon | 8bea2bd | 2012-06-18 15:20:00 +0200 | [diff] [blame] | 2692 | * Port worm reset is required to recover |
| 2693 | */ |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2694 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
| 2695 | u16 portstatus) |
Sarah Sharp | 10d674a | 2011-09-14 14:24:52 -0700 | [diff] [blame] | 2696 | { |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2697 | u16 link_state; |
| 2698 | |
| 2699 | if (!hub_is_superspeed(hub->hdev)) |
| 2700 | return false; |
| 2701 | |
| 2702 | if (test_bit(port1, hub->warm_reset_bits)) |
| 2703 | return true; |
| 2704 | |
| 2705 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; |
| 2706 | return link_state == USB_SS_PORT_LS_SS_INACTIVE |
| 2707 | || link_state == USB_SS_PORT_LS_COMP_MOD; |
Sarah Sharp | 10d674a | 2011-09-14 14:24:52 -0700 | [diff] [blame] | 2708 | } |
| 2709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2711 | struct usb_device *udev, unsigned int delay, bool warm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | { |
| 2713 | int delay_time, ret; |
| 2714 | u16 portstatus; |
| 2715 | u16 portchange; |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 2716 | u32 ext_portstatus = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2717 | |
| 2718 | for (delay_time = 0; |
| 2719 | delay_time < HUB_RESET_TIMEOUT; |
| 2720 | delay_time += delay) { |
| 2721 | /* wait to give the device a chance to reset */ |
| 2722 | msleep(delay); |
| 2723 | |
| 2724 | /* read and decode port status */ |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 2725 | if (hub_is_superspeedplus(hub->hdev)) |
| 2726 | ret = hub_ext_port_status(hub, port1, |
| 2727 | HUB_EXT_PORT_STATUS, |
| 2728 | &portstatus, &portchange, |
| 2729 | &ext_portstatus); |
| 2730 | else |
| 2731 | ret = hub_port_status(hub, port1, &portstatus, |
| 2732 | &portchange); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2733 | if (ret < 0) |
| 2734 | return ret; |
| 2735 | |
Sarah Sharp | 4f43447 | 2012-11-15 14:58:04 -0800 | [diff] [blame] | 2736 | /* The port state is unknown until the reset completes. */ |
Sarah Sharp | 470f0be | 2012-12-11 10:14:03 -0800 | [diff] [blame] | 2737 | if (!(portstatus & USB_PORT_STAT_RESET)) |
| 2738 | break; |
Sarah Sharp | 4f43447 | 2012-11-15 14:58:04 -0800 | [diff] [blame] | 2739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2740 | /* switch to the long delay after two short delay failures */ |
| 2741 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
| 2742 | delay = HUB_LONG_RESET_TIME; |
| 2743 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2744 | dev_dbg(&hub->ports[port1 - 1]->dev, |
| 2745 | "not %sreset yet, waiting %dms\n", |
| 2746 | warm ? "warm " : "", delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | } |
| 2748 | |
Sarah Sharp | 470f0be | 2012-12-11 10:14:03 -0800 | [diff] [blame] | 2749 | if ((portstatus & USB_PORT_STAT_RESET)) |
| 2750 | return -EBUSY; |
| 2751 | |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2752 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
Sarah Sharp | 470f0be | 2012-12-11 10:14:03 -0800 | [diff] [blame] | 2753 | return -ENOTCONN; |
| 2754 | |
| 2755 | /* Device went away? */ |
| 2756 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
| 2757 | return -ENOTCONN; |
| 2758 | |
| 2759 | /* bomb out completely if the connection bounced. A USB 3.0 |
| 2760 | * connection may bounce if multiple warm resets were issued, |
| 2761 | * but the device may have successfully re-connected. Ignore it. |
| 2762 | */ |
| 2763 | if (!hub_is_superspeed(hub->hdev) && |
| 2764 | (portchange & USB_PORT_STAT_C_CONNECTION)) |
| 2765 | return -ENOTCONN; |
| 2766 | |
| 2767 | if (!(portstatus & USB_PORT_STAT_ENABLE)) |
| 2768 | return -EBUSY; |
| 2769 | |
| 2770 | if (!udev) |
| 2771 | return 0; |
| 2772 | |
| 2773 | if (hub_is_wusb(hub)) |
| 2774 | udev->speed = USB_SPEED_WIRELESS; |
Mathias Nyman | 0cdd49a | 2015-12-10 09:59:29 +0200 | [diff] [blame] | 2775 | else if (hub_is_superspeedplus(hub->hdev) && |
| 2776 | port_speed_is_ssp(hub->hdev, ext_portstatus & |
| 2777 | USB_EXT_PORT_STAT_RX_SPEED_ID)) |
| 2778 | udev->speed = USB_SPEED_SUPER_PLUS; |
Sarah Sharp | 470f0be | 2012-12-11 10:14:03 -0800 | [diff] [blame] | 2779 | else if (hub_is_superspeed(hub->hdev)) |
| 2780 | udev->speed = USB_SPEED_SUPER; |
| 2781 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| 2782 | udev->speed = USB_SPEED_HIGH; |
| 2783 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| 2784 | udev->speed = USB_SPEED_LOW; |
| 2785 | else |
| 2786 | udev->speed = USB_SPEED_FULL; |
| 2787 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2788 | } |
| 2789 | |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2790 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | static int hub_port_reset(struct usb_hub *hub, int port1, |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2792 | struct usb_device *udev, unsigned int delay, bool warm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | { |
| 2794 | int i, status; |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2795 | u16 portchange, portstatus; |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2796 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | |
Sarah Sharp | 0fe51aa | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2798 | if (!hub_is_superspeed(hub->hdev)) { |
| 2799 | if (warm) { |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2800 | dev_err(hub->intfdev, "only USB3 hub support " |
| 2801 | "warm reset\n"); |
| 2802 | return -EINVAL; |
| 2803 | } |
Sarah Sharp | 0fe51aa | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2804 | /* Block EHCI CF initialization during the port reset. |
| 2805 | * Some companion controllers don't like it when they mix. |
| 2806 | */ |
| 2807 | down_read(&ehci_cf_port_reset_rwsem); |
Sarah Sharp | d3b9d7a | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2808 | } else if (!warm) { |
| 2809 | /* |
| 2810 | * If the caller hasn't explicitly requested a warm reset, |
| 2811 | * double check and see if one is needed. |
| 2812 | */ |
Robert Schlabbach | fb6d1f7 | 2015-05-26 00:27:30 +0200 | [diff] [blame] | 2813 | if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) |
| 2814 | if (hub_port_warm_reset_required(hub, port1, |
| 2815 | portstatus)) |
| 2816 | warm = true; |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2817 | } |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2818 | clear_bit(port1, hub->warm_reset_bits); |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 2819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | /* Reset the port */ |
| 2821 | for (i = 0; i < PORT_RESET_TRIES; i++) { |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2822 | status = set_port_feature(hub->hdev, port1, (warm ? |
| 2823 | USB_PORT_FEAT_BH_PORT_RESET : |
| 2824 | USB_PORT_FEAT_RESET)); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 2825 | if (status == -ENODEV) { |
| 2826 | ; /* The hub is gone */ |
| 2827 | } else if (status) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2828 | dev_err(&port_dev->dev, |
| 2829 | "cannot %sreset (err = %d)\n", |
| 2830 | warm ? "warm " : "", status); |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2831 | } else { |
| 2832 | status = hub_port_wait_reset(hub, port1, udev, delay, |
| 2833 | warm); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 2834 | if (status && status != -ENOTCONN && status != -ENODEV) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2835 | dev_dbg(hub->intfdev, |
| 2836 | "port_wait_reset: err = %d\n", |
| 2837 | status); |
| 2838 | } |
| 2839 | |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2840 | /* Check for disconnect or reset */ |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2841 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
Robert Schlabbach | fb6d1f7 | 2015-05-26 00:27:30 +0200 | [diff] [blame] | 2842 | usb_clear_port_feature(hub->hdev, port1, |
| 2843 | USB_PORT_FEAT_C_RESET); |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2844 | |
| 2845 | if (!hub_is_superspeed(hub->hdev)) |
| 2846 | goto done; |
| 2847 | |
Robert Schlabbach | fb6d1f7 | 2015-05-26 00:27:30 +0200 | [diff] [blame] | 2848 | usb_clear_port_feature(hub->hdev, port1, |
| 2849 | USB_PORT_FEAT_C_BH_PORT_RESET); |
| 2850 | usb_clear_port_feature(hub->hdev, port1, |
| 2851 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
| 2852 | usb_clear_port_feature(hub->hdev, port1, |
| 2853 | USB_PORT_FEAT_C_CONNECTION); |
| 2854 | |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2855 | /* |
| 2856 | * If a USB 3.0 device migrates from reset to an error |
| 2857 | * state, re-issue the warm reset. |
| 2858 | */ |
| 2859 | if (hub_port_status(hub, port1, |
| 2860 | &portstatus, &portchange) < 0) |
| 2861 | goto done; |
| 2862 | |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2863 | if (!hub_port_warm_reset_required(hub, port1, |
| 2864 | portstatus)) |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2865 | goto done; |
| 2866 | |
| 2867 | /* |
| 2868 | * If the port is in SS.Inactive or Compliance Mode, the |
| 2869 | * hot or warm reset failed. Try another warm reset. |
| 2870 | */ |
| 2871 | if (!warm) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2872 | dev_dbg(&port_dev->dev, |
| 2873 | "hot reset failed, warm reset\n"); |
Sarah Sharp | a24a607 | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2874 | warm = true; |
| 2875 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2876 | } |
| 2877 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2878 | dev_dbg(&port_dev->dev, |
| 2879 | "not enabled, trying %sreset again...\n", |
| 2880 | warm ? "warm " : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | delay = HUB_LONG_RESET_TIME; |
| 2882 | } |
| 2883 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2884 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2886 | done: |
Robert Schlabbach | fb6d1f7 | 2015-05-26 00:27:30 +0200 | [diff] [blame] | 2887 | if (status == 0) { |
| 2888 | /* TRSTRCY = 10 ms; plus some extra */ |
| 2889 | msleep(10 + 40); |
| 2890 | if (udev) { |
| 2891 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 2892 | |
| 2893 | update_devnum(udev, 0); |
| 2894 | /* The xHC may think the device is already reset, |
| 2895 | * so ignore the status. |
| 2896 | */ |
| 2897 | if (hcd->driver->reset_device) |
| 2898 | hcd->driver->reset_device(hcd, udev); |
| 2899 | |
| 2900 | usb_set_device_state(udev, USB_STATE_DEFAULT); |
| 2901 | } |
| 2902 | } else { |
| 2903 | if (udev) |
| 2904 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 2905 | } |
| 2906 | |
Sarah Sharp | 0fe51aa | 2012-11-01 11:20:44 -0700 | [diff] [blame] | 2907 | if (!hub_is_superspeed(hub->hdev)) |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 2908 | up_read(&ehci_cf_port_reset_rwsem); |
| 2909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2910 | return status; |
| 2911 | } |
| 2912 | |
Andiry Xu | 0ed9a57 | 2011-04-27 18:07:43 +0800 | [diff] [blame] | 2913 | /* Check if a port is power on */ |
| 2914 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) |
| 2915 | { |
| 2916 | int ret = 0; |
| 2917 | |
| 2918 | if (hub_is_superspeed(hub->hdev)) { |
| 2919 | if (portstatus & USB_SS_PORT_STAT_POWER) |
| 2920 | ret = 1; |
| 2921 | } else { |
| 2922 | if (portstatus & USB_PORT_STAT_POWER) |
| 2923 | ret = 1; |
| 2924 | } |
| 2925 | |
| 2926 | return ret; |
| 2927 | } |
| 2928 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 2929 | static void usb_lock_port(struct usb_port *port_dev) |
| 2930 | __acquires(&port_dev->status_lock) |
| 2931 | { |
| 2932 | mutex_lock(&port_dev->status_lock); |
| 2933 | __acquire(&port_dev->status_lock); |
| 2934 | } |
| 2935 | |
| 2936 | static void usb_unlock_port(struct usb_port *port_dev) |
| 2937 | __releases(&port_dev->status_lock) |
| 2938 | { |
| 2939 | mutex_unlock(&port_dev->status_lock); |
| 2940 | __release(&port_dev->status_lock); |
| 2941 | } |
| 2942 | |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2943 | #ifdef CONFIG_PM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | |
Andiry Xu | 0ed9a57 | 2011-04-27 18:07:43 +0800 | [diff] [blame] | 2945 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
| 2946 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) |
| 2947 | { |
| 2948 | int ret = 0; |
| 2949 | |
| 2950 | if (hub_is_superspeed(hub->hdev)) { |
| 2951 | if ((portstatus & USB_PORT_STAT_LINK_STATE) |
| 2952 | == USB_SS_PORT_LS_U3) |
| 2953 | ret = 1; |
| 2954 | } else { |
| 2955 | if (portstatus & USB_PORT_STAT_SUSPEND) |
| 2956 | ret = 1; |
| 2957 | } |
| 2958 | |
| 2959 | return ret; |
| 2960 | } |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2961 | |
| 2962 | /* Determine whether the device on a port is ready for a normal resume, |
| 2963 | * is ready for a reset-resume, or should be disconnected. |
| 2964 | */ |
| 2965 | static int check_port_resume_type(struct usb_device *udev, |
| 2966 | struct usb_hub *hub, int port1, |
Julius Werner | 7fa4091 | 2015-01-27 13:20:12 -0800 | [diff] [blame] | 2967 | int status, u16 portchange, u16 portstatus) |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2968 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2969 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Julius Werner | 7fa4091 | 2015-01-27 13:20:12 -0800 | [diff] [blame] | 2970 | int retries = 3; |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 2971 | |
Julius Werner | 7fa4091 | 2015-01-27 13:20:12 -0800 | [diff] [blame] | 2972 | retry: |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2973 | /* Is a warm reset needed to recover the connection? */ |
| 2974 | if (status == 0 && udev->reset_resume |
| 2975 | && hub_port_warm_reset_required(hub, port1, portstatus)) { |
| 2976 | /* pass */; |
| 2977 | } |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2978 | /* Is the device still present? */ |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 2979 | else if (status || port_is_suspended(hub, portstatus) || |
Julius Werner | 7fa4091 | 2015-01-27 13:20:12 -0800 | [diff] [blame] | 2980 | !port_is_power_on(hub, portstatus)) { |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2981 | if (status >= 0) |
| 2982 | status = -ENODEV; |
Julius Werner | 7fa4091 | 2015-01-27 13:20:12 -0800 | [diff] [blame] | 2983 | } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
| 2984 | if (retries--) { |
| 2985 | usleep_range(200, 300); |
| 2986 | status = hub_port_status(hub, port1, &portstatus, |
| 2987 | &portchange); |
| 2988 | goto retry; |
| 2989 | } |
| 2990 | status = -ENODEV; |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2991 | } |
| 2992 | |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 2993 | /* Can't do a normal resume if the port isn't enabled, |
| 2994 | * so try a reset-resume instead. |
| 2995 | */ |
| 2996 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { |
| 2997 | if (udev->persist_enabled) |
| 2998 | udev->reset_resume = 1; |
| 2999 | else |
| 3000 | status = -ENODEV; |
| 3001 | } |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3002 | |
| 3003 | if (status) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 3004 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
| 3005 | portchange, portstatus, status); |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3006 | } else if (udev->reset_resume) { |
| 3007 | |
| 3008 | /* Late port handoff can set status-change bits */ |
| 3009 | if (portchange & USB_PORT_STAT_C_CONNECTION) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3010 | usb_clear_port_feature(hub->hdev, port1, |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3011 | USB_PORT_FEAT_C_CONNECTION); |
| 3012 | if (portchange & USB_PORT_STAT_C_ENABLE) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3013 | usb_clear_port_feature(hub->hdev, port1, |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3014 | USB_PORT_FEAT_C_ENABLE); |
| 3015 | } |
| 3016 | |
| 3017 | return status; |
| 3018 | } |
| 3019 | |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 3020 | int usb_disable_ltm(struct usb_device *udev) |
| 3021 | { |
| 3022 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 3023 | |
| 3024 | /* Check if the roothub and device supports LTM. */ |
| 3025 | if (!usb_device_supports_ltm(hcd->self.root_hub) || |
| 3026 | !usb_device_supports_ltm(udev)) |
| 3027 | return 0; |
| 3028 | |
| 3029 | /* Clear Feature LTM Enable can only be sent if the device is |
| 3030 | * configured. |
| 3031 | */ |
| 3032 | if (!udev->actconfig) |
| 3033 | return 0; |
| 3034 | |
| 3035 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3036 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| 3037 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
| 3038 | USB_CTRL_SET_TIMEOUT); |
| 3039 | } |
| 3040 | EXPORT_SYMBOL_GPL(usb_disable_ltm); |
| 3041 | |
| 3042 | void usb_enable_ltm(struct usb_device *udev) |
| 3043 | { |
| 3044 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 3045 | |
| 3046 | /* Check if the roothub and device supports LTM. */ |
| 3047 | if (!usb_device_supports_ltm(hcd->self.root_hub) || |
| 3048 | !usb_device_supports_ltm(udev)) |
| 3049 | return; |
| 3050 | |
| 3051 | /* Set Feature LTM Enable can only be sent if the device is |
| 3052 | * configured. |
| 3053 | */ |
| 3054 | if (!udev->actconfig) |
| 3055 | return; |
| 3056 | |
| 3057 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3058 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| 3059 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
| 3060 | USB_CTRL_SET_TIMEOUT); |
| 3061 | } |
| 3062 | EXPORT_SYMBOL_GPL(usb_enable_ltm); |
| 3063 | |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3064 | /* |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3065 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3066 | * @udev: target device |
| 3067 | * |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3068 | * For USB-2 devices: Set the device's remote wakeup feature. |
| 3069 | * |
| 3070 | * For USB-3 devices: Assume there's only one function on the device and |
| 3071 | * enable remote wake for the first interface. FIXME if the interface |
| 3072 | * association descriptor shows there's more than one function. |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3073 | */ |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3074 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3075 | { |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3076 | if (udev->speed < USB_SPEED_SUPER) |
| 3077 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3078 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| 3079 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
| 3080 | USB_CTRL_SET_TIMEOUT); |
| 3081 | else |
| 3082 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3083 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
| 3084 | USB_INTRF_FUNC_SUSPEND, |
| 3085 | USB_INTRF_FUNC_SUSPEND_RW | |
| 3086 | USB_INTRF_FUNC_SUSPEND_LP, |
| 3087 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 3088 | } |
| 3089 | |
| 3090 | /* |
| 3091 | * usb_disable_remote_wakeup - disable remote wakeup for a device |
| 3092 | * @udev: target device |
| 3093 | * |
| 3094 | * For USB-2 devices: Clear the device's remote wakeup feature. |
| 3095 | * |
| 3096 | * For USB-3 devices: Assume there's only one function on the device and |
| 3097 | * disable remote wake for the first interface. FIXME if the interface |
| 3098 | * association descriptor shows there's more than one function. |
| 3099 | */ |
| 3100 | static int usb_disable_remote_wakeup(struct usb_device *udev) |
| 3101 | { |
| 3102 | if (udev->speed < USB_SPEED_SUPER) |
| 3103 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3104 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| 3105 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
| 3106 | USB_CTRL_SET_TIMEOUT); |
| 3107 | else |
| 3108 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3109 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
| 3110 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, |
| 3111 | USB_CTRL_SET_TIMEOUT); |
| 3112 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3113 | |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3114 | /* Count of wakeup-enabled devices at or below udev */ |
| 3115 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) |
| 3116 | { |
| 3117 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
| 3118 | |
| 3119 | return udev->do_remote_wakeup + |
| 3120 | (hub ? hub->wakeup_enabled_descendants : 0); |
| 3121 | } |
| 3122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3123 | /* |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 3124 | * usb_port_suspend - suspend a usb device's upstream port |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3125 | * @udev: device that's no longer in active use, not a root hub |
David Brownell | 5edbfb7 | 2005-09-22 22:45:26 -0700 | [diff] [blame] | 3126 | * Context: must be able to sleep; device not locked; pm locks held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | * |
| 3128 | * Suspends a USB device that isn't in active use, conserving power. |
| 3129 | * Devices may wake out of a suspend, if anything important happens, |
| 3130 | * using the remote wakeup mechanism. They may also be taken out of |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 3131 | * suspend by the host, using usb_port_resume(). It's also routine |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | * to disconnect devices while they are suspended. |
| 3133 | * |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 3134 | * This only affects the USB hardware for a device; its interfaces |
| 3135 | * (and, for hubs, child devices) must already have been suspended. |
| 3136 | * |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3137 | * Selective port suspend reduces power; most suspended devices draw |
| 3138 | * less than 500 uA. It's also used in OTG, along with remote wakeup. |
| 3139 | * All devices below the suspended port are also suspended. |
| 3140 | * |
| 3141 | * Devices leave suspend state when the host wakes them up. Some devices |
| 3142 | * also support "remote wakeup", where the device can activate the USB |
| 3143 | * tree above them to deliver data, such as a keypress or packet. In |
| 3144 | * some cases, this wakes the USB host. |
| 3145 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | * Suspending OTG devices may trigger HNP, if that's been enabled |
| 3147 | * between a pair of dual-role devices. That will change roles, such |
| 3148 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
| 3149 | * |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 3150 | * Devices on USB hub ports have only one "suspend" state, corresponding |
| 3151 | * to ACPI D2, "may cause the device to lose some context". |
| 3152 | * State transitions include: |
| 3153 | * |
| 3154 | * - suspend, resume ... when the VBUS power link stays live |
| 3155 | * - suspend, disconnect ... VBUS lost |
| 3156 | * |
| 3157 | * Once VBUS drop breaks the circuit, the port it's using has to go through |
| 3158 | * normal re-enumeration procedures, starting with enabling VBUS power. |
| 3159 | * Other than re-initializing the hub (plug/unplug, except for root hubs), |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 3160 | * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 3161 | * timer, no SRP, no requests through sysfs. |
| 3162 | * |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3163 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
| 3164 | * suspended until their bus goes into global suspend (i.e., the root |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3165 | * hub is suspended). Nevertheless, we change @udev->state to |
| 3166 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual |
| 3167 | * upstream port setting is stored in @udev->port_is_suspended. |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 3168 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3169 | * Returns 0 on success, else negative errno. |
| 3170 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 3171 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3173 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| 3174 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3175 | int port1 = udev->portnum; |
| 3176 | int status; |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3177 | bool really_suspend = true; |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 3178 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3179 | usb_lock_port(port_dev); |
| 3180 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3181 | /* enable remote wakeup when appropriate; this lets the device |
| 3182 | * wake up the upstream hub (including maybe the root hub). |
| 3183 | * |
| 3184 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when |
| 3185 | * we don't explicitly enable it here. |
| 3186 | */ |
| 3187 | if (udev->do_remote_wakeup) { |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3188 | status = usb_enable_remote_wakeup(udev); |
Oliver Neukum | 0c48720 | 2009-10-19 13:19:41 +0200 | [diff] [blame] | 3189 | if (status) { |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3190 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
| 3191 | status); |
Oliver Neukum | 0c48720 | 2009-10-19 13:19:41 +0200 | [diff] [blame] | 3192 | /* bail if autosuspend is requested */ |
Alan Stern | 5b1b0b8 | 2011-08-19 23:49:48 +0200 | [diff] [blame] | 3193 | if (PMSG_IS_AUTO(msg)) |
Alan Stern | 4fae6f0 | 2013-07-30 15:39:02 -0400 | [diff] [blame] | 3194 | goto err_wakeup; |
Oliver Neukum | 0c48720 | 2009-10-19 13:19:41 +0200 | [diff] [blame] | 3195 | } |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3196 | } |
| 3197 | |
Andiry Xu | 65580b43 | 2011-09-23 14:19:52 -0700 | [diff] [blame] | 3198 | /* disable USB2 hardware LPM */ |
| 3199 | if (udev->usb2_hw_lpm_enabled == 1) |
| 3200 | usb_set_usb2_hardware_lpm(udev, 0); |
| 3201 | |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 3202 | if (usb_disable_ltm(udev)) { |
Alan Stern | 4fae6f0 | 2013-07-30 15:39:02 -0400 | [diff] [blame] | 3203 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
| 3204 | status = -ENOMEM; |
| 3205 | if (PMSG_IS_AUTO(msg)) |
| 3206 | goto err_ltm; |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 3207 | } |
Sarah Sharp | 8306095 | 2012-05-02 14:25:52 -0700 | [diff] [blame] | 3208 | if (usb_unlocked_disable_lpm(udev)) { |
Alan Stern | 4fae6f0 | 2013-07-30 15:39:02 -0400 | [diff] [blame] | 3209 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
| 3210 | status = -ENOMEM; |
| 3211 | if (PMSG_IS_AUTO(msg)) |
| 3212 | goto err_lpm3; |
Sarah Sharp | 8306095 | 2012-05-02 14:25:52 -0700 | [diff] [blame] | 3213 | } |
| 3214 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3215 | /* see 7.1.7.6 */ |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3216 | if (hub_is_superspeed(hub->hdev)) |
Sarah Sharp | c2f60db | 2012-12-10 15:43:08 -0800 | [diff] [blame] | 3217 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3218 | |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3219 | /* |
| 3220 | * For system suspend, we do not need to enable the suspend feature |
| 3221 | * on individual USB-2 ports. The devices will automatically go |
| 3222 | * into suspend a few ms after the root hub stops sending packets. |
| 3223 | * The USB 2.0 spec calls this "global suspend". |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3224 | * |
| 3225 | * However, many USB hubs have a bug: They don't relay wakeup requests |
| 3226 | * from a downstream port if the port's suspend feature isn't on. |
| 3227 | * Therefore we will turn on the suspend feature if udev or any of its |
| 3228 | * descendants is enabled for remote wakeup. |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3229 | */ |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3230 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
| 3231 | status = set_port_feature(hub->hdev, port1, |
| 3232 | USB_PORT_FEAT_SUSPEND); |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3233 | else { |
| 3234 | really_suspend = false; |
| 3235 | status = 0; |
| 3236 | } |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3237 | if (status) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 3238 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
Alan Stern | cbb3300 | 2011-06-15 16:29:16 -0400 | [diff] [blame] | 3239 | |
Alan Stern | 4fae6f0 | 2013-07-30 15:39:02 -0400 | [diff] [blame] | 3240 | /* Try to enable USB3 LPM and LTM again */ |
| 3241 | usb_unlocked_enable_lpm(udev); |
| 3242 | err_lpm3: |
| 3243 | usb_enable_ltm(udev); |
| 3244 | err_ltm: |
Andiry Xu | c3e751e | 2012-05-05 00:50:10 +0800 | [diff] [blame] | 3245 | /* Try to enable USB2 hardware LPM again */ |
| 3246 | if (udev->usb2_hw_lpm_capable == 1) |
| 3247 | usb_set_usb2_hardware_lpm(udev, 1); |
| 3248 | |
Alan Stern | 4fae6f0 | 2013-07-30 15:39:02 -0400 | [diff] [blame] | 3249 | if (udev->do_remote_wakeup) |
| 3250 | (void) usb_disable_remote_wakeup(udev); |
| 3251 | err_wakeup: |
Sarah Sharp | 8306095 | 2012-05-02 14:25:52 -0700 | [diff] [blame] | 3252 | |
Alan Stern | cbb3300 | 2011-06-15 16:29:16 -0400 | [diff] [blame] | 3253 | /* System sleep transitions should never fail */ |
Alan Stern | 5b1b0b8 | 2011-08-19 23:49:48 +0200 | [diff] [blame] | 3254 | if (!PMSG_IS_AUTO(msg)) |
Alan Stern | cbb3300 | 2011-06-15 16:29:16 -0400 | [diff] [blame] | 3255 | status = 0; |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3256 | } else { |
Alan Stern | 30b1a7a | 2011-09-27 21:54:22 +0200 | [diff] [blame] | 3257 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
| 3258 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), |
| 3259 | udev->do_remote_wakeup); |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3260 | if (really_suspend) { |
| 3261 | udev->port_is_suspended = 1; |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3262 | |
| 3263 | /* device has up to 10 msec to fully suspend */ |
Alan Stern | 0aa2832 | 2013-03-27 16:14:19 -0400 | [diff] [blame] | 3264 | msleep(10); |
| 3265 | } |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3266 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3267 | } |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3268 | |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 3269 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
| 3270 | && test_and_clear_bit(port1, hub->child_usage_bits)) |
Lan Tianyu | 98a4f1f | 2013-07-03 22:17:54 +0800 | [diff] [blame] | 3271 | pm_runtime_put_sync(&port_dev->dev); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3272 | |
Alan Stern | c08512c | 2010-11-15 15:57:58 -0500 | [diff] [blame] | 3273 | usb_mark_last_busy(hub->hdev); |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3274 | |
| 3275 | usb_unlock_port(port_dev); |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 3276 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3277 | } |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 3278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | /* |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 3280 | * If the USB "suspend" state is in use (rather than "global suspend"), |
| 3281 | * many devices will be individually taken out of suspend state using |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3282 | * special "resume" signaling. This routine kicks in shortly after |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3283 | * hardware resume signaling is finished, either because of selective |
| 3284 | * resume (by host) or remote wakeup (by device) ... now see what changed |
| 3285 | * in the tree that's rooted at this device. |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3286 | * |
| 3287 | * If @udev->reset_resume is set then the device is reset before the |
| 3288 | * status check is done. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3289 | */ |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 3290 | static int finish_port_resume(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3291 | { |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3292 | int status = 0; |
Oliver Neukum | 07e72b9 | 2012-11-29 15:05:57 +0100 | [diff] [blame] | 3293 | u16 devstatus = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3294 | |
| 3295 | /* caller owns the udev device lock */ |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 3296 | dev_dbg(&udev->dev, "%s\n", |
| 3297 | udev->reset_resume ? "finish reset-resume" : "finish resume"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3298 | |
| 3299 | /* usb ch9 identifies four variants of SUSPENDED, based on what |
| 3300 | * state the device resumes to. Linux currently won't see the |
| 3301 | * first two on the host side; they'd be inside hub_port_init() |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 3302 | * during many timeouts, but hub_wq can't suspend until later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3303 | */ |
| 3304 | usb_set_device_state(udev, udev->actconfig |
| 3305 | ? USB_STATE_CONFIGURED |
| 3306 | : USB_STATE_ADDRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3307 | |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3308 | /* 10.5.4.5 says not to reset a suspended port if the attached |
| 3309 | * device is enabled for remote wakeup. Hence the reset |
| 3310 | * operation is carried out here, after the port has been |
| 3311 | * resumed. |
| 3312 | */ |
Alan Stern | 1d10255 | 2014-03-18 10:39:05 -0400 | [diff] [blame] | 3313 | if (udev->reset_resume) { |
| 3314 | /* |
| 3315 | * If the device morphs or switches modes when it is reset, |
| 3316 | * we don't want to perform a reset-resume. We'll fail the |
| 3317 | * resume, which will cause a logical disconnect, and then |
| 3318 | * the device will be rediscovered. |
| 3319 | */ |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 3320 | retry_reset_resume: |
Alan Stern | 1d10255 | 2014-03-18 10:39:05 -0400 | [diff] [blame] | 3321 | if (udev->quirks & USB_QUIRK_RESET) |
| 3322 | status = -ENODEV; |
| 3323 | else |
| 3324 | status = usb_reset_and_verify_device(udev); |
| 3325 | } |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3326 | |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 3327 | /* 10.5.4.5 says be sure devices in the tree are still there. |
| 3328 | * For now let's assume the device didn't go crazy on resume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3329 | * and device drivers will know about any resume quirks. |
| 3330 | */ |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3331 | if (status == 0) { |
Alan Stern | 46dede4 | 2007-08-14 10:56:10 -0400 | [diff] [blame] | 3332 | devstatus = 0; |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3333 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 3334 | |
| 3335 | /* If a normal resume failed, try doing a reset-resume */ |
| 3336 | if (status && !udev->reset_resume && udev->persist_enabled) { |
| 3337 | dev_dbg(&udev->dev, "retry with reset-resume\n"); |
| 3338 | udev->reset_resume = 1; |
| 3339 | goto retry_reset_resume; |
| 3340 | } |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3341 | } |
Alan Stern | b40b7a9 | 2006-06-19 15:12:38 -0400 | [diff] [blame] | 3342 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3343 | if (status) { |
| 3344 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", |
| 3345 | status); |
Oliver Neukum | 07e72b9 | 2012-11-29 15:05:57 +0100 | [diff] [blame] | 3346 | /* |
| 3347 | * There are a few quirky devices which violate the standard |
| 3348 | * by claiming to have remote wakeup enabled after a reset, |
| 3349 | * which crash if the feature is cleared, hence check for |
| 3350 | * udev->reset_resume |
| 3351 | */ |
| 3352 | } else if (udev->actconfig && !udev->reset_resume) { |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3353 | if (udev->speed < USB_SPEED_SUPER) { |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3354 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3355 | status = usb_disable_remote_wakeup(udev); |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3356 | } else { |
| 3357 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, |
| 3358 | &devstatus); |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3359 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
| 3360 | | USB_INTRF_STAT_FUNC_RW)) |
Alan Stern | 28e8616 | 2013-07-30 15:37:33 -0400 | [diff] [blame] | 3361 | status = usb_disable_remote_wakeup(udev); |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 3362 | } |
Lan Tianyu | 54a3ac0 | 2013-01-24 10:31:28 +0800 | [diff] [blame] | 3363 | |
| 3364 | if (status) |
| 3365 | dev_dbg(&udev->dev, |
| 3366 | "disable remote wakeup, status %d\n", |
| 3367 | status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3368 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3369 | } |
| 3370 | return status; |
| 3371 | } |
| 3372 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3373 | /* |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3374 | * There are some SS USB devices which take longer time for link training. |
| 3375 | * XHCI specs 4.19.4 says that when Link training is successful, port |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3376 | * sets CCS bit to 1. So if SW reads port status before successful link |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3377 | * training, then it will not find device to be present. |
| 3378 | * USB Analyzer log with such buggy devices show that in some cases |
| 3379 | * device switch on the RX termination after long delay of host enabling |
| 3380 | * the VBUS. In few other cases it has been seen that device fails to |
| 3381 | * negotiate link training in first attempt. It has been |
| 3382 | * reported till now that few devices take as long as 2000 ms to train |
| 3383 | * the link after host enabling its VBUS and termination. Following |
| 3384 | * routine implements a 2000 ms timeout for link training. If in a case |
| 3385 | * link trains before timeout, loop will exit earlier. |
| 3386 | * |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3387 | * There are also some 2.0 hard drive based devices and 3.0 thumb |
| 3388 | * drives that, when plugged into a 2.0 only port, take a long |
| 3389 | * time to set CCS after VBUS enable. |
| 3390 | * |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3391 | * FIXME: If a device was connected before suspend, but was removed |
| 3392 | * while system was asleep, then the loop in the following routine will |
| 3393 | * only exit at timeout. |
| 3394 | * |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3395 | * This routine should only be called when persist is enabled. |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3396 | */ |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3397 | static int wait_for_connected(struct usb_device *udev, |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3398 | struct usb_hub *hub, int *port1, |
| 3399 | u16 *portchange, u16 *portstatus) |
| 3400 | { |
| 3401 | int status = 0, delay_ms = 0; |
| 3402 | |
| 3403 | while (delay_ms < 2000) { |
| 3404 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) |
| 3405 | break; |
| 3406 | msleep(20); |
| 3407 | delay_ms += 20; |
| 3408 | status = hub_port_status(hub, *port1, portstatus, portchange); |
| 3409 | } |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3410 | dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3411 | return status; |
| 3412 | } |
| 3413 | |
| 3414 | /* |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3415 | * usb_port_resume - re-activate a suspended usb device's upstream port |
| 3416 | * @udev: device to re-activate, not a root hub |
| 3417 | * Context: must be able to sleep; device not locked; pm locks held |
| 3418 | * |
| 3419 | * This will re-activate the suspended device, increasing power usage |
| 3420 | * while letting drivers communicate again with its endpoints. |
| 3421 | * USB resume explicitly guarantees that the power session between |
| 3422 | * the host and the device is the same as it was when the device |
| 3423 | * suspended. |
| 3424 | * |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 3425 | * If @udev->reset_resume is set then this routine won't check that the |
| 3426 | * port is still enabled. Furthermore, finish_port_resume() above will |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3427 | * reset @udev. The end result is that a broken power session can be |
| 3428 | * recovered and @udev will appear to persist across a loss of VBUS power. |
| 3429 | * |
| 3430 | * For example, if a host controller doesn't maintain VBUS suspend current |
| 3431 | * during a system sleep or is reset when the system wakes up, all the USB |
| 3432 | * power sessions below it will be broken. This is especially troublesome |
| 3433 | * for mass-storage devices containing mounted filesystems, since the |
| 3434 | * device will appear to have disconnected and all the memory mappings |
| 3435 | * to it will be lost. Using the USB_PERSIST facility, the device can be |
| 3436 | * made to appear as if it had not disconnected. |
| 3437 | * |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3438 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 3439 | * every effort to insure that the same device is present after the |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3440 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
| 3441 | * quite possible for a device to remain unaltered but its media to be |
| 3442 | * changed. If the user replaces a flash memory card while the system is |
| 3443 | * asleep, he will have only himself to blame when the filesystem on the |
| 3444 | * new card is corrupted and the system crashes. |
| 3445 | * |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3446 | * Returns 0 on success, else negative errno. |
| 3447 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 3448 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3449 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3450 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| 3451 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 3452 | int port1 = udev->portnum; |
| 3453 | int status; |
| 3454 | u16 portchange, portstatus; |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 3455 | |
Dan Williams | d5c3834 | 2014-05-20 18:08:52 -0700 | [diff] [blame] | 3456 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3457 | status = pm_runtime_get_sync(&port_dev->dev); |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3458 | if (status < 0) { |
| 3459 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", |
| 3460 | status); |
| 3461 | return status; |
| 3462 | } |
| 3463 | } |
| 3464 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3465 | usb_lock_port(port_dev); |
| 3466 | |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 3467 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
| 3468 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
Andiry Xu | 0ed9a57 | 2011-04-27 18:07:43 +0800 | [diff] [blame] | 3469 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 3470 | goto SuspendCleared; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3472 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3473 | if (hub_is_superspeed(hub->hdev)) |
Sarah Sharp | c2f60db | 2012-12-10 15:43:08 -0800 | [diff] [blame] | 3474 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3475 | else |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3476 | status = usb_clear_port_feature(hub->hdev, |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3477 | port1, USB_PORT_FEAT_SUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3478 | if (status) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 3479 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3480 | } else { |
Felipe Balbi | bbc78c0 | 2015-02-13 15:38:33 -0600 | [diff] [blame] | 3481 | /* drive resume for USB_RESUME_TIMEOUT msec */ |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 3482 | dev_dbg(&udev->dev, "usb %sresume\n", |
Alan Stern | 5b1b0b8 | 2011-08-19 23:49:48 +0200 | [diff] [blame] | 3483 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
Felipe Balbi | bbc78c0 | 2015-02-13 15:38:33 -0600 | [diff] [blame] | 3484 | msleep(USB_RESUME_TIMEOUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3486 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
| 3487 | * stop resume signaling. Then finish the resume |
| 3488 | * sequence. |
| 3489 | */ |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 3490 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3491 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3492 | /* TRSMRCY = 10 msec */ |
| 3493 | msleep(10); |
| 3494 | } |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3495 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3496 | SuspendCleared: |
| 3497 | if (status == 0) { |
Alan Stern | bfd1e91 | 2012-10-19 11:03:39 -0400 | [diff] [blame] | 3498 | udev->port_is_suspended = 0; |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3499 | if (hub_is_superspeed(hub->hdev)) { |
| 3500 | if (portchange & USB_PORT_STAT_C_LINK_STATE) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3501 | usb_clear_port_feature(hub->hdev, port1, |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3502 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
| 3503 | } else { |
| 3504 | if (portchange & USB_PORT_STAT_C_SUSPEND) |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 3505 | usb_clear_port_feature(hub->hdev, port1, |
Andiry Xu | a711423 | 2011-04-27 18:07:50 +0800 | [diff] [blame] | 3506 | USB_PORT_FEAT_C_SUSPEND); |
| 3507 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3509 | |
Al Cooper | 6b82b12 | 2015-12-02 14:55:07 -0500 | [diff] [blame] | 3510 | if (udev->persist_enabled) |
| 3511 | status = wait_for_connected(udev, hub, &port1, &portchange, |
Pratyush Anand | a40178b | 2014-07-18 12:37:10 +0530 | [diff] [blame] | 3512 | &portstatus); |
| 3513 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 3514 | status = check_port_resume_type(udev, |
| 3515 | hub, port1, status, portchange, portstatus); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3516 | if (status == 0) |
| 3517 | status = finish_port_resume(udev); |
| 3518 | if (status < 0) { |
| 3519 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| 3520 | hub_port_logical_disconnect(hub, port1); |
Andiry Xu | 65580b43 | 2011-09-23 14:19:52 -0700 | [diff] [blame] | 3521 | } else { |
| 3522 | /* Try to enable USB2 hardware LPM */ |
| 3523 | if (udev->usb2_hw_lpm_capable == 1) |
| 3524 | usb_set_usb2_hardware_lpm(udev, 1); |
Sarah Sharp | 8306095 | 2012-05-02 14:25:52 -0700 | [diff] [blame] | 3525 | |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 3526 | /* Try to enable USB3 LTM and LPM */ |
| 3527 | usb_enable_ltm(udev); |
Sarah Sharp | 8306095 | 2012-05-02 14:25:52 -0700 | [diff] [blame] | 3528 | usb_unlocked_enable_lpm(udev); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3529 | } |
Andiry Xu | 65580b43 | 2011-09-23 14:19:52 -0700 | [diff] [blame] | 3530 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3531 | usb_unlock_port(port_dev); |
| 3532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3533 | return status; |
| 3534 | } |
| 3535 | |
Alan Stern | 0534d46 | 2010-01-08 12:56:30 -0500 | [diff] [blame] | 3536 | int usb_remote_wakeup(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | { |
| 3538 | int status = 0; |
| 3539 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3540 | usb_lock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | if (udev->state == USB_STATE_SUSPENDED) { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 3542 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
Alan Stern | 9bbdf1e | 2010-01-08 12:57:28 -0500 | [diff] [blame] | 3543 | status = usb_autoresume_device(udev); |
| 3544 | if (status == 0) { |
| 3545 | /* Let the drivers do their thing, then... */ |
| 3546 | usb_autosuspend_device(udev); |
| 3547 | } |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 3548 | } |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 3549 | usb_unlock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3550 | return status; |
| 3551 | } |
| 3552 | |
Dan Williams | 7e73be2 | 2014-05-20 18:09:31 -0700 | [diff] [blame] | 3553 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
| 3554 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
| 3555 | u16 portstatus, u16 portchange) |
| 3556 | __must_hold(&port_dev->status_lock) |
| 3557 | { |
| 3558 | struct usb_port *port_dev = hub->ports[port - 1]; |
| 3559 | struct usb_device *hdev; |
| 3560 | struct usb_device *udev; |
| 3561 | int connect_change = 0; |
| 3562 | int ret; |
| 3563 | |
| 3564 | hdev = hub->hdev; |
| 3565 | udev = port_dev->child; |
| 3566 | if (!hub_is_superspeed(hdev)) { |
| 3567 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) |
| 3568 | return 0; |
| 3569 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); |
| 3570 | } else { |
| 3571 | if (!udev || udev->state != USB_STATE_SUSPENDED || |
| 3572 | (portstatus & USB_PORT_STAT_LINK_STATE) != |
| 3573 | USB_SS_PORT_LS_U0) |
| 3574 | return 0; |
| 3575 | } |
| 3576 | |
| 3577 | if (udev) { |
| 3578 | /* TRSMRCY = 10 msec */ |
| 3579 | msleep(10); |
| 3580 | |
| 3581 | usb_unlock_port(port_dev); |
| 3582 | ret = usb_remote_wakeup(udev); |
| 3583 | usb_lock_port(port_dev); |
| 3584 | if (ret < 0) |
| 3585 | connect_change = 1; |
| 3586 | } else { |
| 3587 | ret = -ENODEV; |
| 3588 | hub_port_disable(hub, port, 1); |
| 3589 | } |
| 3590 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); |
| 3591 | return connect_change; |
| 3592 | } |
| 3593 | |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 3594 | static int check_ports_changed(struct usb_hub *hub) |
| 3595 | { |
| 3596 | int port1; |
| 3597 | |
| 3598 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { |
| 3599 | u16 portstatus, portchange; |
| 3600 | int status; |
| 3601 | |
| 3602 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 3603 | if (!status && portchange) |
| 3604 | return 1; |
| 3605 | } |
| 3606 | return 0; |
| 3607 | } |
| 3608 | |
David Brownell | db69087 | 2005-09-13 19:56:33 -0700 | [diff] [blame] | 3609 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | { |
Chase Metzger | 1724856 | 2015-08-11 21:34:37 -0700 | [diff] [blame] | 3611 | struct usb_hub *hub = usb_get_intfdata(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3612 | struct usb_device *hdev = hub->hdev; |
| 3613 | unsigned port1; |
Sarah Sharp | 4296c70a | 2012-01-06 10:34:31 -0800 | [diff] [blame] | 3614 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3615 | |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3616 | /* |
| 3617 | * Warn if children aren't already suspended. |
| 3618 | * Also, add up the number of wakeup-enabled descendants. |
| 3619 | */ |
| 3620 | hub->wakeup_enabled_descendants = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 3622 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 3623 | struct usb_device *udev = port_dev->child; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3624 | |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 3625 | if (udev && udev->can_submit) { |
Dan Williams | b658b8f | 2014-06-17 16:16:22 -0700 | [diff] [blame] | 3626 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
| 3627 | dev_name(&udev->dev)); |
Alan Stern | 5b1b0b8 | 2011-08-19 23:49:48 +0200 | [diff] [blame] | 3628 | if (PMSG_IS_AUTO(msg)) |
Alan Stern | cbb3300 | 2011-06-15 16:29:16 -0400 | [diff] [blame] | 3629 | return -EBUSY; |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 3630 | } |
Alan Stern | e583d9d | 2013-07-11 14:58:04 -0400 | [diff] [blame] | 3631 | if (udev) |
| 3632 | hub->wakeup_enabled_descendants += |
| 3633 | wakeup_enabled_descendants(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3634 | } |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 3635 | |
| 3636 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { |
| 3637 | /* check if there are changes pending on hub ports */ |
| 3638 | if (check_ports_changed(hub)) { |
| 3639 | if (PMSG_IS_AUTO(msg)) |
| 3640 | return -EBUSY; |
| 3641 | pm_wakeup_event(&hdev->dev, 2000); |
| 3642 | } |
| 3643 | } |
| 3644 | |
Sarah Sharp | 4296c70a | 2012-01-06 10:34:31 -0800 | [diff] [blame] | 3645 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
| 3646 | /* Enable hub to send remote wakeup for all ports. */ |
| 3647 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| 3648 | status = set_port_feature(hdev, |
| 3649 | port1 | |
| 3650 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | |
| 3651 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | |
| 3652 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, |
| 3653 | USB_PORT_FEAT_REMOTE_WAKE_MASK); |
| 3654 | } |
| 3655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3656 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 3657 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3658 | |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 3659 | /* stop hub_wq and related activity */ |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 3660 | hub_quiesce(hub, HUB_SUSPEND); |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 3661 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | } |
| 3663 | |
| 3664 | static int hub_resume(struct usb_interface *intf) |
| 3665 | { |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 3666 | struct usb_hub *hub = usb_get_intfdata(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3667 | |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 3668 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 3669 | hub_activate(hub, HUB_RESUME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3670 | return 0; |
| 3671 | } |
| 3672 | |
Alan Stern | b41a60e | 2007-05-30 15:39:33 -0400 | [diff] [blame] | 3673 | static int hub_reset_resume(struct usb_interface *intf) |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 3674 | { |
Alan Stern | b41a60e | 2007-05-30 15:39:33 -0400 | [diff] [blame] | 3675 | struct usb_hub *hub = usb_get_intfdata(intf); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 3676 | |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 3677 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 3678 | hub_activate(hub, HUB_RESET_RESUME); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 3679 | return 0; |
| 3680 | } |
| 3681 | |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3682 | /** |
| 3683 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
| 3684 | * @rhdev: struct usb_device for the root hub |
| 3685 | * |
| 3686 | * The USB host controller driver calls this function when its root hub |
| 3687 | * is resumed and Vbus power has been interrupted or the controller |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 3688 | * has been reset. The routine marks @rhdev as having lost power. |
| 3689 | * When the hub driver is resumed it will take notice and carry out |
| 3690 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; |
| 3691 | * the others will be disconnected. |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 3692 | */ |
| 3693 | void usb_root_hub_lost_power(struct usb_device *rhdev) |
| 3694 | { |
| 3695 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); |
| 3696 | rhdev->reset_resume = 1; |
| 3697 | } |
| 3698 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
| 3699 | |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3700 | static const char * const usb3_lpm_names[] = { |
| 3701 | "U0", |
| 3702 | "U1", |
| 3703 | "U2", |
| 3704 | "U3", |
| 3705 | }; |
| 3706 | |
| 3707 | /* |
| 3708 | * Send a Set SEL control transfer to the device, prior to enabling |
| 3709 | * device-initiated U1 or U2. This lets the device know the exit latencies from |
| 3710 | * the time the device initiates a U1 or U2 exit, to the time it will receive a |
| 3711 | * packet from the host. |
| 3712 | * |
| 3713 | * This function will fail if the SEL or PEL values for udev are greater than |
| 3714 | * the maximum allowed values for the link state to be enabled. |
| 3715 | */ |
| 3716 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) |
| 3717 | { |
| 3718 | struct usb_set_sel_req *sel_values; |
| 3719 | unsigned long long u1_sel; |
| 3720 | unsigned long long u1_pel; |
| 3721 | unsigned long long u2_sel; |
| 3722 | unsigned long long u2_pel; |
| 3723 | int ret; |
| 3724 | |
Xenia Ragiadakou | 38d7f68 | 2013-09-04 17:24:45 +0300 | [diff] [blame] | 3725 | if (udev->state != USB_STATE_CONFIGURED) |
| 3726 | return 0; |
| 3727 | |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3728 | /* Convert SEL and PEL stored in ns to us */ |
| 3729 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); |
| 3730 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); |
| 3731 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); |
| 3732 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); |
| 3733 | |
| 3734 | /* |
| 3735 | * Make sure that the calculated SEL and PEL values for the link |
| 3736 | * state we're enabling aren't bigger than the max SEL/PEL |
| 3737 | * value that will fit in the SET SEL control transfer. |
| 3738 | * Otherwise the device would get an incorrect idea of the exit |
| 3739 | * latency for the link state, and could start a device-initiated |
| 3740 | * U1/U2 when the exit latencies are too high. |
| 3741 | */ |
| 3742 | if ((state == USB3_LPM_U1 && |
| 3743 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || |
| 3744 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || |
| 3745 | (state == USB3_LPM_U2 && |
| 3746 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || |
| 3747 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { |
Sarah Sharp | 1510a1a | 2012-10-05 10:30:35 -0700 | [diff] [blame] | 3748 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3749 | usb3_lpm_names[state], u1_sel, u1_pel); |
| 3750 | return -EINVAL; |
| 3751 | } |
| 3752 | |
| 3753 | /* |
| 3754 | * If we're enabling device-initiated LPM for one link state, |
| 3755 | * but the other link state has a too high SEL or PEL value, |
| 3756 | * just set those values to the max in the Set SEL request. |
| 3757 | */ |
| 3758 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) |
| 3759 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; |
| 3760 | |
| 3761 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) |
| 3762 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; |
| 3763 | |
| 3764 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) |
| 3765 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; |
| 3766 | |
| 3767 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) |
| 3768 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; |
| 3769 | |
| 3770 | /* |
| 3771 | * usb_enable_lpm() can be called as part of a failed device reset, |
| 3772 | * which may be initiated by an error path of a mass storage driver. |
| 3773 | * Therefore, use GFP_NOIO. |
| 3774 | */ |
| 3775 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); |
| 3776 | if (!sel_values) |
| 3777 | return -ENOMEM; |
| 3778 | |
| 3779 | sel_values->u1_sel = u1_sel; |
| 3780 | sel_values->u1_pel = u1_pel; |
| 3781 | sel_values->u2_sel = cpu_to_le16(u2_sel); |
| 3782 | sel_values->u2_pel = cpu_to_le16(u2_pel); |
| 3783 | |
| 3784 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3785 | USB_REQ_SET_SEL, |
| 3786 | USB_RECIP_DEVICE, |
| 3787 | 0, 0, |
| 3788 | sel_values, sizeof *(sel_values), |
| 3789 | USB_CTRL_SET_TIMEOUT); |
| 3790 | kfree(sel_values); |
| 3791 | return ret; |
| 3792 | } |
| 3793 | |
| 3794 | /* |
| 3795 | * Enable or disable device-initiated U1 or U2 transitions. |
| 3796 | */ |
| 3797 | static int usb_set_device_initiated_lpm(struct usb_device *udev, |
| 3798 | enum usb3_link_state state, bool enable) |
| 3799 | { |
| 3800 | int ret; |
| 3801 | int feature; |
| 3802 | |
| 3803 | switch (state) { |
| 3804 | case USB3_LPM_U1: |
| 3805 | feature = USB_DEVICE_U1_ENABLE; |
| 3806 | break; |
| 3807 | case USB3_LPM_U2: |
| 3808 | feature = USB_DEVICE_U2_ENABLE; |
| 3809 | break; |
| 3810 | default: |
| 3811 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", |
| 3812 | __func__, enable ? "enable" : "disable"); |
| 3813 | return -EINVAL; |
| 3814 | } |
| 3815 | |
| 3816 | if (udev->state != USB_STATE_CONFIGURED) { |
| 3817 | dev_dbg(&udev->dev, "%s: Can't %s %s state " |
| 3818 | "for unconfigured device.\n", |
| 3819 | __func__, enable ? "enable" : "disable", |
| 3820 | usb3_lpm_names[state]); |
| 3821 | return 0; |
| 3822 | } |
| 3823 | |
| 3824 | if (enable) { |
| 3825 | /* |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3826 | * Now send the control transfer to enable device-initiated LPM |
| 3827 | * for either U1 or U2. |
| 3828 | */ |
| 3829 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3830 | USB_REQ_SET_FEATURE, |
| 3831 | USB_RECIP_DEVICE, |
| 3832 | feature, |
| 3833 | 0, NULL, 0, |
| 3834 | USB_CTRL_SET_TIMEOUT); |
| 3835 | } else { |
| 3836 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3837 | USB_REQ_CLEAR_FEATURE, |
| 3838 | USB_RECIP_DEVICE, |
| 3839 | feature, |
| 3840 | 0, NULL, 0, |
| 3841 | USB_CTRL_SET_TIMEOUT); |
| 3842 | } |
| 3843 | if (ret < 0) { |
| 3844 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", |
| 3845 | enable ? "Enable" : "Disable", |
| 3846 | usb3_lpm_names[state]); |
| 3847 | return -EBUSY; |
| 3848 | } |
| 3849 | return 0; |
| 3850 | } |
| 3851 | |
| 3852 | static int usb_set_lpm_timeout(struct usb_device *udev, |
| 3853 | enum usb3_link_state state, int timeout) |
| 3854 | { |
| 3855 | int ret; |
| 3856 | int feature; |
| 3857 | |
| 3858 | switch (state) { |
| 3859 | case USB3_LPM_U1: |
| 3860 | feature = USB_PORT_FEAT_U1_TIMEOUT; |
| 3861 | break; |
| 3862 | case USB3_LPM_U2: |
| 3863 | feature = USB_PORT_FEAT_U2_TIMEOUT; |
| 3864 | break; |
| 3865 | default: |
| 3866 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", |
| 3867 | __func__); |
| 3868 | return -EINVAL; |
| 3869 | } |
| 3870 | |
| 3871 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && |
| 3872 | timeout != USB3_LPM_DEVICE_INITIATED) { |
| 3873 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " |
| 3874 | "which is a reserved value.\n", |
| 3875 | usb3_lpm_names[state], timeout); |
| 3876 | return -EINVAL; |
| 3877 | } |
| 3878 | |
| 3879 | ret = set_port_feature(udev->parent, |
| 3880 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, |
| 3881 | feature); |
| 3882 | if (ret < 0) { |
| 3883 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," |
| 3884 | "error code %i\n", usb3_lpm_names[state], |
| 3885 | timeout, ret); |
| 3886 | return -EBUSY; |
| 3887 | } |
| 3888 | if (state == USB3_LPM_U1) |
| 3889 | udev->u1_params.timeout = timeout; |
| 3890 | else |
| 3891 | udev->u2_params.timeout = timeout; |
| 3892 | return 0; |
| 3893 | } |
| 3894 | |
| 3895 | /* |
| 3896 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated |
| 3897 | * U1/U2 entry. |
| 3898 | * |
| 3899 | * We will attempt to enable U1 or U2, but there are no guarantees that the |
| 3900 | * control transfers to set the hub timeout or enable device-initiated U1/U2 |
| 3901 | * will be successful. |
| 3902 | * |
| 3903 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI |
| 3904 | * driver know about it. If that call fails, it should be harmless, and just |
| 3905 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. |
| 3906 | */ |
| 3907 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
| 3908 | enum usb3_link_state state) |
| 3909 | { |
Sarah Sharp | 65a95b7 | 2012-10-05 10:32:07 -0700 | [diff] [blame] | 3910 | int timeout, ret; |
Sarah Sharp | ae8963a | 2012-10-03 11:18:05 -0700 | [diff] [blame] | 3911 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
| 3912 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; |
| 3913 | |
| 3914 | /* If the device says it doesn't have *any* exit latency to come out of |
| 3915 | * U1 or U2, it's probably lying. Assume it doesn't implement that link |
| 3916 | * state. |
| 3917 | */ |
| 3918 | if ((state == USB3_LPM_U1 && u1_mel == 0) || |
| 3919 | (state == USB3_LPM_U2 && u2_mel == 0)) |
| 3920 | return; |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3921 | |
Sarah Sharp | 65a95b7 | 2012-10-05 10:32:07 -0700 | [diff] [blame] | 3922 | /* |
| 3923 | * First, let the device know about the exit latencies |
| 3924 | * associated with the link state we're about to enable. |
| 3925 | */ |
| 3926 | ret = usb_req_set_sel(udev, state); |
| 3927 | if (ret < 0) { |
| 3928 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", |
| 3929 | usb3_lpm_names[state]); |
| 3930 | return; |
| 3931 | } |
| 3932 | |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3933 | /* We allow the host controller to set the U1/U2 timeout internally |
| 3934 | * first, so that it can change its schedule to account for the |
| 3935 | * additional latency to send data to a device in a lower power |
| 3936 | * link state. |
| 3937 | */ |
| 3938 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); |
| 3939 | |
| 3940 | /* xHCI host controller doesn't want to enable this LPM state. */ |
| 3941 | if (timeout == 0) |
| 3942 | return; |
| 3943 | |
| 3944 | if (timeout < 0) { |
| 3945 | dev_warn(&udev->dev, "Could not enable %s link state, " |
| 3946 | "xHCI error %i.\n", usb3_lpm_names[state], |
| 3947 | timeout); |
| 3948 | return; |
| 3949 | } |
| 3950 | |
Lu Baolu | bf5ce5b | 2015-11-14 16:26:32 +0800 | [diff] [blame] | 3951 | if (usb_set_lpm_timeout(udev, state, timeout)) { |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3952 | /* If we can't set the parent hub U1/U2 timeout, |
| 3953 | * device-initiated LPM won't be allowed either, so let the xHCI |
| 3954 | * host know that this link state won't be enabled. |
| 3955 | */ |
| 3956 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); |
Lu Baolu | bf5ce5b | 2015-11-14 16:26:32 +0800 | [diff] [blame] | 3957 | } else { |
| 3958 | /* Only a configured device will accept the Set Feature |
| 3959 | * U1/U2_ENABLE |
| 3960 | */ |
| 3961 | if (udev->actconfig) |
| 3962 | usb_set_device_initiated_lpm(udev, state, true); |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3963 | |
Lu Baolu | bf5ce5b | 2015-11-14 16:26:32 +0800 | [diff] [blame] | 3964 | /* As soon as usb_set_lpm_timeout(timeout) returns 0, the |
| 3965 | * hub-initiated LPM is enabled. Thus, LPM is enabled no |
| 3966 | * matter the result of usb_set_device_initiated_lpm(). |
| 3967 | * The only difference is whether device is able to initiate |
| 3968 | * LPM. |
| 3969 | */ |
| 3970 | if (state == USB3_LPM_U1) |
| 3971 | udev->usb3_lpm_u1_enabled = 1; |
| 3972 | else if (state == USB3_LPM_U2) |
| 3973 | udev->usb3_lpm_u2_enabled = 1; |
| 3974 | } |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3975 | } |
| 3976 | |
| 3977 | /* |
| 3978 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated |
| 3979 | * U1/U2 entry. |
| 3980 | * |
| 3981 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. |
| 3982 | * If zero is returned, the parent will not allow the link to go into U1/U2. |
| 3983 | * |
| 3984 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but |
| 3985 | * it won't have an effect on the bus link state because the parent hub will |
| 3986 | * still disallow device-initiated U1/U2 entry. |
| 3987 | * |
| 3988 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is |
| 3989 | * possible. The result will be slightly more bus bandwidth will be taken up |
| 3990 | * (to account for U1/U2 exit latency), but it should be harmless. |
| 3991 | */ |
| 3992 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
| 3993 | enum usb3_link_state state) |
| 3994 | { |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3995 | switch (state) { |
| 3996 | case USB3_LPM_U1: |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3997 | case USB3_LPM_U2: |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 3998 | break; |
| 3999 | default: |
| 4000 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", |
| 4001 | __func__); |
| 4002 | return -EINVAL; |
| 4003 | } |
| 4004 | |
| 4005 | if (usb_set_lpm_timeout(udev, state, 0)) |
| 4006 | return -EBUSY; |
| 4007 | |
| 4008 | usb_set_device_initiated_lpm(udev, state, false); |
| 4009 | |
| 4010 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) |
| 4011 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " |
| 4012 | "bus schedule bandwidth may be impacted.\n", |
| 4013 | usb3_lpm_names[state]); |
Lu Baolu | bf5ce5b | 2015-11-14 16:26:32 +0800 | [diff] [blame] | 4014 | |
| 4015 | /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM |
| 4016 | * is disabled. Hub will disallows link to enter U1/U2 as well, |
| 4017 | * even device is initiating LPM. Hence LPM is disabled if hub LPM |
| 4018 | * timeout set to 0, no matter device-initiated LPM is disabled or |
| 4019 | * not. |
| 4020 | */ |
| 4021 | if (state == USB3_LPM_U1) |
| 4022 | udev->usb3_lpm_u1_enabled = 0; |
| 4023 | else if (state == USB3_LPM_U2) |
| 4024 | udev->usb3_lpm_u2_enabled = 0; |
| 4025 | |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4026 | return 0; |
| 4027 | } |
| 4028 | |
| 4029 | /* |
| 4030 | * Disable hub-initiated and device-initiated U1 and U2 entry. |
| 4031 | * Caller must own the bandwidth_mutex. |
| 4032 | * |
| 4033 | * This will call usb_enable_lpm() on failure, which will decrement |
| 4034 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. |
| 4035 | */ |
| 4036 | int usb_disable_lpm(struct usb_device *udev) |
| 4037 | { |
| 4038 | struct usb_hcd *hcd; |
| 4039 | |
| 4040 | if (!udev || !udev->parent || |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4041 | udev->speed < USB_SPEED_SUPER || |
Pratyush Anand | 51df62f | 2014-07-04 17:01:27 +0300 | [diff] [blame] | 4042 | !udev->lpm_capable || |
| 4043 | udev->state < USB_STATE_DEFAULT) |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4044 | return 0; |
| 4045 | |
| 4046 | hcd = bus_to_hcd(udev->bus); |
| 4047 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) |
| 4048 | return 0; |
| 4049 | |
| 4050 | udev->lpm_disable_count++; |
Dan Carpenter | 55558c3 | 2012-05-22 20:54:34 +0300 | [diff] [blame] | 4051 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4052 | return 0; |
| 4053 | |
| 4054 | /* If LPM is enabled, attempt to disable it. */ |
| 4055 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) |
| 4056 | goto enable_lpm; |
| 4057 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) |
| 4058 | goto enable_lpm; |
| 4059 | |
| 4060 | return 0; |
| 4061 | |
| 4062 | enable_lpm: |
| 4063 | usb_enable_lpm(udev); |
| 4064 | return -EBUSY; |
| 4065 | } |
| 4066 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
| 4067 | |
| 4068 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ |
| 4069 | int usb_unlocked_disable_lpm(struct usb_device *udev) |
| 4070 | { |
| 4071 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 4072 | int ret; |
| 4073 | |
| 4074 | if (!hcd) |
| 4075 | return -EINVAL; |
| 4076 | |
| 4077 | mutex_lock(hcd->bandwidth_mutex); |
| 4078 | ret = usb_disable_lpm(udev); |
| 4079 | mutex_unlock(hcd->bandwidth_mutex); |
| 4080 | |
| 4081 | return ret; |
| 4082 | } |
| 4083 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
| 4084 | |
| 4085 | /* |
| 4086 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The |
| 4087 | * xHCI host policy may prevent U1 or U2 from being enabled. |
| 4088 | * |
| 4089 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled |
| 4090 | * until the lpm_disable_count drops to zero. Caller must own the |
| 4091 | * bandwidth_mutex. |
| 4092 | */ |
| 4093 | void usb_enable_lpm(struct usb_device *udev) |
| 4094 | { |
| 4095 | struct usb_hcd *hcd; |
Lu Baolu | 513072d | 2015-11-14 16:26:33 +0800 | [diff] [blame] | 4096 | struct usb_hub *hub; |
| 4097 | struct usb_port *port_dev; |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4098 | |
| 4099 | if (!udev || !udev->parent || |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4100 | udev->speed < USB_SPEED_SUPER || |
Pratyush Anand | 51df62f | 2014-07-04 17:01:27 +0300 | [diff] [blame] | 4101 | !udev->lpm_capable || |
| 4102 | udev->state < USB_STATE_DEFAULT) |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4103 | return; |
| 4104 | |
| 4105 | udev->lpm_disable_count--; |
| 4106 | hcd = bus_to_hcd(udev->bus); |
| 4107 | /* Double check that we can both enable and disable LPM. |
| 4108 | * Device must be configured to accept set feature U1/U2 timeout. |
| 4109 | */ |
| 4110 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || |
| 4111 | !hcd->driver->disable_usb3_lpm_timeout) |
| 4112 | return; |
| 4113 | |
| 4114 | if (udev->lpm_disable_count > 0) |
| 4115 | return; |
| 4116 | |
Lu Baolu | 513072d | 2015-11-14 16:26:33 +0800 | [diff] [blame] | 4117 | hub = usb_hub_to_struct_hub(udev->parent); |
| 4118 | if (!hub) |
| 4119 | return; |
| 4120 | |
| 4121 | port_dev = hub->ports[udev->portnum - 1]; |
| 4122 | |
| 4123 | if (port_dev->usb3_lpm_u1_permit) |
| 4124 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); |
| 4125 | |
| 4126 | if (port_dev->usb3_lpm_u2_permit) |
| 4127 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4128 | } |
| 4129 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
| 4130 | |
| 4131 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ |
| 4132 | void usb_unlocked_enable_lpm(struct usb_device *udev) |
| 4133 | { |
| 4134 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 4135 | |
| 4136 | if (!hcd) |
| 4137 | return; |
| 4138 | |
| 4139 | mutex_lock(hcd->bandwidth_mutex); |
| 4140 | usb_enable_lpm(udev); |
| 4141 | mutex_unlock(hcd->bandwidth_mutex); |
| 4142 | } |
| 4143 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
| 4144 | |
| 4145 | |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 4146 | #else /* CONFIG_PM */ |
| 4147 | |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 4148 | #define hub_suspend NULL |
| 4149 | #define hub_resume NULL |
| 4150 | #define hub_reset_resume NULL |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4151 | |
| 4152 | int usb_disable_lpm(struct usb_device *udev) |
| 4153 | { |
| 4154 | return 0; |
| 4155 | } |
Sarah Sharp | e9261fb | 2012-05-21 08:29:01 -0700 | [diff] [blame] | 4156 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4157 | |
| 4158 | void usb_enable_lpm(struct usb_device *udev) { } |
Sarah Sharp | e9261fb | 2012-05-21 08:29:01 -0700 | [diff] [blame] | 4159 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4160 | |
| 4161 | int usb_unlocked_disable_lpm(struct usb_device *udev) |
| 4162 | { |
| 4163 | return 0; |
| 4164 | } |
Sarah Sharp | e9261fb | 2012-05-21 08:29:01 -0700 | [diff] [blame] | 4165 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
Sarah Sharp | 1ea7e0e | 2012-04-24 17:21:50 -0700 | [diff] [blame] | 4166 | |
| 4167 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } |
Sarah Sharp | e9261fb | 2012-05-21 08:29:01 -0700 | [diff] [blame] | 4168 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 4169 | |
| 4170 | int usb_disable_ltm(struct usb_device *udev) |
| 4171 | { |
| 4172 | return 0; |
| 4173 | } |
| 4174 | EXPORT_SYMBOL_GPL(usb_disable_ltm); |
| 4175 | |
| 4176 | void usb_enable_ltm(struct usb_device *udev) { } |
| 4177 | EXPORT_SYMBOL_GPL(usb_enable_ltm); |
Alan Stern | c4b51a4 | 2013-07-11 14:58:23 -0400 | [diff] [blame] | 4178 | |
Stephen Rothwell | 4a95b1f | 2014-05-29 18:55:06 +1000 | [diff] [blame] | 4179 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
| 4180 | u16 portstatus, u16 portchange) |
| 4181 | { |
| 4182 | return 0; |
| 4183 | } |
| 4184 | |
Alan Stern | c4b51a4 | 2013-07-11 14:58:23 -0400 | [diff] [blame] | 4185 | #endif /* CONFIG_PM */ |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 4186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4187 | |
| 4188 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
| 4189 | * |
| 4190 | * Between connect detection and reset signaling there must be a delay |
| 4191 | * of 100ms at least for debounce and power-settling. The corresponding |
| 4192 | * timer shall restart whenever the downstream port detects a disconnect. |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4193 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4194 | * Apparently there are some bluetooth and irda-dongles and a number of |
| 4195 | * low-speed devices for which this debounce period may last over a second. |
| 4196 | * Not covered by the spec - but easy to deal with. |
| 4197 | * |
| 4198 | * This implementation uses a 1500ms total debounce timeout; if the |
| 4199 | * connection isn't stable by then it returns -ETIMEDOUT. It checks |
| 4200 | * every 25ms for transient disconnects. When the port status has been |
| 4201 | * unchanged for 100ms it returns the port status. |
| 4202 | */ |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 4203 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4204 | { |
| 4205 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4206 | u16 portchange, portstatus; |
| 4207 | unsigned connection = 0xffff; |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4208 | int total_time, stable_time = 0; |
| 4209 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4210 | |
| 4211 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| 4212 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 4213 | if (ret < 0) |
| 4214 | return ret; |
| 4215 | |
| 4216 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
| 4217 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 4218 | if (!must_be_connected || |
| 4219 | (connection == USB_PORT_STAT_CONNECTION)) |
| 4220 | stable_time += HUB_DEBOUNCE_STEP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4221 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
| 4222 | break; |
| 4223 | } else { |
| 4224 | stable_time = 0; |
| 4225 | connection = portstatus & USB_PORT_STAT_CONNECTION; |
| 4226 | } |
| 4227 | |
| 4228 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 4229 | usb_clear_port_feature(hub->hdev, port1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4230 | USB_PORT_FEAT_C_CONNECTION); |
| 4231 | } |
| 4232 | |
| 4233 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| 4234 | break; |
| 4235 | msleep(HUB_DEBOUNCE_STEP); |
| 4236 | } |
| 4237 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4238 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
| 4239 | total_time, stable_time, portstatus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4240 | |
| 4241 | if (stable_time < HUB_DEBOUNCE_STABLE) |
| 4242 | return -ETIMEDOUT; |
| 4243 | return portstatus; |
| 4244 | } |
| 4245 | |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4246 | void usb_ep0_reinit(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4247 | { |
Alan Stern | ddeac4e7 | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 4248 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
| 4249 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 4250 | usb_enable_endpoint(udev, &udev->ep0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4251 | } |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4252 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4253 | |
| 4254 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
| 4255 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
| 4256 | |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 4257 | static int hub_set_address(struct usb_device *udev, int devnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4258 | { |
| 4259 | int retval; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4260 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4261 | |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4262 | /* |
| 4263 | * The host controller will choose the device address, |
| 4264 | * instead of the core having chosen it earlier |
| 4265 | */ |
| 4266 | if (!hcd->driver->address_device && devnum <= 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4267 | return -EINVAL; |
| 4268 | if (udev->state == USB_STATE_ADDRESS) |
| 4269 | return 0; |
| 4270 | if (udev->state != USB_STATE_DEFAULT) |
| 4271 | return -EINVAL; |
Andiry Xu | c8d4af8 | 2010-10-14 07:22:51 -0700 | [diff] [blame] | 4272 | if (hcd->driver->address_device) |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4273 | retval = hcd->driver->address_device(hcd, udev); |
Andiry Xu | c8d4af8 | 2010-10-14 07:22:51 -0700 | [diff] [blame] | 4274 | else |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4275 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
| 4276 | USB_REQ_SET_ADDRESS, 0, devnum, 0, |
| 4277 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4278 | if (retval == 0) { |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4279 | update_devnum(udev, devnum); |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4280 | /* Device now using proper address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4281 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4282 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4283 | } |
| 4284 | return retval; |
| 4285 | } |
| 4286 | |
Mathias Nyman | 890dae8 | 2013-09-30 17:26:31 +0300 | [diff] [blame] | 4287 | /* |
| 4288 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM |
| 4289 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is |
| 4290 | * enabled. |
| 4291 | * |
| 4292 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the |
| 4293 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL |
| 4294 | * support bit in the BOS descriptor. |
| 4295 | */ |
| 4296 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) |
| 4297 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4298 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
| 4299 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; |
Mathias Nyman | 890dae8 | 2013-09-30 17:26:31 +0300 | [diff] [blame] | 4300 | |
| 4301 | if (!udev->usb2_hw_lpm_capable) |
| 4302 | return; |
| 4303 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4304 | if (hub) |
| 4305 | connect_type = hub->ports[udev->portnum - 1]->connect_type; |
Mathias Nyman | 890dae8 | 2013-09-30 17:26:31 +0300 | [diff] [blame] | 4306 | |
Bjørn Mork | 23c0582 | 2014-02-27 14:23:55 +0100 | [diff] [blame] | 4307 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
Mathias Nyman | 890dae8 | 2013-09-30 17:26:31 +0300 | [diff] [blame] | 4308 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| 4309 | udev->usb2_hw_lpm_allowed = 1; |
| 4310 | usb_set_usb2_hardware_lpm(udev, 1); |
| 4311 | } |
| 4312 | } |
| 4313 | |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4314 | static int hub_enable_device(struct usb_device *udev) |
| 4315 | { |
| 4316 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
| 4317 | |
| 4318 | if (!hcd->driver->enable_device) |
| 4319 | return 0; |
| 4320 | if (udev->state == USB_STATE_ADDRESS) |
| 4321 | return 0; |
| 4322 | if (udev->state != USB_STATE_DEFAULT) |
| 4323 | return -EINVAL; |
| 4324 | |
| 4325 | return hcd->driver->enable_device(hcd, udev); |
| 4326 | } |
| 4327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4328 | /* Reset device, (re)assign address, get device descriptor. |
| 4329 | * Device connection must be stable, no more debouncing needed. |
| 4330 | * Returns device in USB_STATE_ADDRESS, except on error. |
| 4331 | * |
| 4332 | * If this is called for an already-existing device (as part of |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4333 | * usb_reset_and_verify_device), the caller must own the device lock and |
| 4334 | * the port lock. For a newly detected device that is not accessible |
| 4335 | * through any global pointers, it's not necessary to lock the device, |
| 4336 | * but it is still necessary to lock the port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4337 | */ |
| 4338 | static int |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4339 | hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4340 | int retry_counter) |
| 4341 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4342 | struct usb_device *hdev = hub->hdev; |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 4343 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
Oliver Neukum | 0d5ce77 | 2016-02-17 11:52:43 +0100 | [diff] [blame] | 4344 | int retries, operations, retval, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4345 | unsigned delay = HUB_SHORT_RESET_TIME; |
| 4346 | enum usb_device_speed oldspeed = udev->speed; |
Michal Nazarewicz | e538dfd | 2011-08-30 17:11:19 +0200 | [diff] [blame] | 4347 | const char *speed; |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 4348 | int devnum = udev->devnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4349 | |
| 4350 | /* root hub ports have a slightly longer reset period |
| 4351 | * (from USB 2.0 spec, section 7.1.7.5) |
| 4352 | */ |
| 4353 | if (!hdev->parent) { |
| 4354 | delay = HUB_ROOT_RESET_TIME; |
| 4355 | if (port1 == hdev->bus->otg_port) |
| 4356 | hdev->bus->b_hnp_enable = 0; |
| 4357 | } |
| 4358 | |
| 4359 | /* Some low speed devices have problems with the quick delay, so */ |
| 4360 | /* be a bit pessimistic with those devices. RHbug #23670 */ |
| 4361 | if (oldspeed == USB_SPEED_LOW) |
| 4362 | delay = HUB_LONG_RESET_TIME; |
| 4363 | |
Chris Bainbridge | feb26ac | 2016-04-25 13:48:38 +0100 | [diff] [blame] | 4364 | mutex_lock(hcd->address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4365 | |
Luben Tuikov | 07194ab | 2011-02-11 11:33:10 -0800 | [diff] [blame] | 4366 | /* Reset the device; full speed may morph to high speed */ |
| 4367 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 4368 | retval = hub_port_reset(hub, port1, udev, delay, false); |
Luben Tuikov | 07194ab | 2011-02-11 11:33:10 -0800 | [diff] [blame] | 4369 | if (retval < 0) /* error or disconnect */ |
| 4370 | goto fail; |
| 4371 | /* success, speed is known */ |
| 4372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4373 | retval = -ENODEV; |
| 4374 | |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4375 | /* Don't allow speed changes at reset, except usb 3.0 to faster */ |
| 4376 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && |
| 4377 | !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4378 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
| 4379 | goto fail; |
| 4380 | } |
| 4381 | oldspeed = udev->speed; |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 4382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4383 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| 4384 | * it's fixed size except for full speed devices. |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 4385 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
| 4386 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4387 | */ |
| 4388 | switch (udev->speed) { |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4389 | case USB_SPEED_SUPER_PLUS: |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 4390 | case USB_SPEED_SUPER: |
Greg Kroah-Hartman | 551cdbb | 2010-01-14 11:08:04 -0800 | [diff] [blame] | 4391 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 4392 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 4393 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4394 | case USB_SPEED_HIGH: /* fixed at 64 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 4395 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4396 | break; |
| 4397 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| 4398 | /* to determine the ep0 maxpacket size, try to read |
| 4399 | * the device descriptor to get bMaxPacketSize0 and |
| 4400 | * then correct our initial guess. |
| 4401 | */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 4402 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4403 | break; |
| 4404 | case USB_SPEED_LOW: /* fixed at 8 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 4405 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4406 | break; |
| 4407 | default: |
| 4408 | goto fail; |
| 4409 | } |
Michal Nazarewicz | e538dfd | 2011-08-30 17:11:19 +0200 | [diff] [blame] | 4410 | |
| 4411 | if (udev->speed == USB_SPEED_WIRELESS) |
| 4412 | speed = "variable speed Wireless"; |
| 4413 | else |
| 4414 | speed = usb_speed_string(udev->speed); |
| 4415 | |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4416 | if (udev->speed < USB_SPEED_SUPER) |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4417 | dev_info(&udev->dev, |
Michal Nazarewicz | e538dfd | 2011-08-30 17:11:19 +0200 | [diff] [blame] | 4418 | "%s %s USB device number %d using %s\n", |
| 4419 | (udev->config) ? "reset" : "new", speed, |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4420 | devnum, udev->bus->controller->driver->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4421 | |
| 4422 | /* Set up TT records, if needed */ |
| 4423 | if (hdev->tt) { |
| 4424 | udev->tt = hdev->tt; |
| 4425 | udev->ttport = hdev->ttport; |
| 4426 | } else if (udev->speed != USB_SPEED_HIGH |
| 4427 | && hdev->speed == USB_SPEED_HIGH) { |
Alan Stern | d199c96 | 2011-01-31 10:56:37 -0500 | [diff] [blame] | 4428 | if (!hub->tt.hub) { |
| 4429 | dev_err(&udev->dev, "parent hub has no TT\n"); |
| 4430 | retval = -EINVAL; |
| 4431 | goto fail; |
| 4432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4433 | udev->tt = &hub->tt; |
| 4434 | udev->ttport = port1; |
| 4435 | } |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4437 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
| 4438 | * Because device hardware and firmware is sometimes buggy in |
| 4439 | * this area, and this is how Linux has done it for ages. |
| 4440 | * Change it cautiously. |
| 4441 | * |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4442 | * NOTE: If use_new_scheme() is true we will start by issuing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4443 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
| 4444 | * so it may help with some non-standards-compliant devices. |
| 4445 | * Otherwise we start with SET_ADDRESS and then try to read the |
| 4446 | * first 8 bytes of the device descriptor to get the ep0 maxpacket |
| 4447 | * value. |
| 4448 | */ |
Oliver Neukum | 0d5ce77 | 2016-02-17 11:52:43 +0100 | [diff] [blame] | 4449 | for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4450 | bool did_new_scheme = false; |
| 4451 | |
| 4452 | if (use_new_scheme(udev, retry_counter)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4453 | struct usb_device_descriptor *buf; |
| 4454 | int r = 0; |
| 4455 | |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4456 | did_new_scheme = true; |
| 4457 | retval = hub_enable_device(udev); |
Oliver Neukum | 938569e | 2014-02-27 10:57:10 +0100 | [diff] [blame] | 4458 | if (retval < 0) { |
| 4459 | dev_err(&udev->dev, |
| 4460 | "hub failed to enable device, error %d\n", |
| 4461 | retval); |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4462 | goto fail; |
Oliver Neukum | 938569e | 2014-02-27 10:57:10 +0100 | [diff] [blame] | 4463 | } |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4465 | #define GET_DESCRIPTOR_BUFSIZE 64 |
| 4466 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
| 4467 | if (!buf) { |
| 4468 | retval = -ENOMEM; |
| 4469 | continue; |
| 4470 | } |
| 4471 | |
Alan Stern | b89ee19 | 2007-05-11 10:19:04 -0400 | [diff] [blame] | 4472 | /* Retry on all errors; some devices are flakey. |
| 4473 | * 255 is for WUSB devices, we actually need to use |
| 4474 | * 512 (WUSB1.0[4.8.1]). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4475 | */ |
Oliver Neukum | 0d5ce77 | 2016-02-17 11:52:43 +0100 | [diff] [blame] | 4476 | for (operations = 0; operations < 3; ++operations) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4477 | buf->bMaxPacketSize0 = 0; |
| 4478 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
| 4479 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 4480 | USB_DT_DEVICE << 8, 0, |
| 4481 | buf, GET_DESCRIPTOR_BUFSIZE, |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 4482 | initial_descriptor_timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4483 | switch (buf->bMaxPacketSize0) { |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 4484 | case 8: case 16: case 32: case 64: case 255: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4485 | if (buf->bDescriptorType == |
| 4486 | USB_DT_DEVICE) { |
| 4487 | r = 0; |
| 4488 | break; |
| 4489 | } |
| 4490 | /* FALL THROUGH */ |
| 4491 | default: |
| 4492 | if (r == 0) |
| 4493 | r = -EPROTO; |
| 4494 | break; |
| 4495 | } |
Oliver Neukum | 264904c | 2016-02-10 11:33:18 +0100 | [diff] [blame] | 4496 | /* |
| 4497 | * Some devices time out if they are powered on |
| 4498 | * when already connected. They need a second |
| 4499 | * reset. But only on the first attempt, |
| 4500 | * lest we get into a time out/reset loop |
| 4501 | */ |
Oliver Neukum | 0d5ce77 | 2016-02-17 11:52:43 +0100 | [diff] [blame] | 4502 | if (r == 0 || (r == -ETIMEDOUT && retries == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4503 | break; |
| 4504 | } |
| 4505 | udev->descriptor.bMaxPacketSize0 = |
| 4506 | buf->bMaxPacketSize0; |
| 4507 | kfree(buf); |
| 4508 | |
Andiry Xu | 75d7cf7 | 2011-09-13 16:41:11 -0700 | [diff] [blame] | 4509 | retval = hub_port_reset(hub, port1, udev, delay, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4510 | if (retval < 0) /* error or disconnect */ |
| 4511 | goto fail; |
| 4512 | if (oldspeed != udev->speed) { |
| 4513 | dev_dbg(&udev->dev, |
| 4514 | "device reset changed speed!\n"); |
| 4515 | retval = -ENODEV; |
| 4516 | goto fail; |
| 4517 | } |
| 4518 | if (r) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4519 | if (r != -ENODEV) |
| 4520 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", |
| 4521 | r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4522 | retval = -EMSGSIZE; |
| 4523 | continue; |
| 4524 | } |
| 4525 | #undef GET_DESCRIPTOR_BUFSIZE |
| 4526 | } |
| 4527 | |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4528 | /* |
| 4529 | * If device is WUSB, we already assigned an |
| 4530 | * unauthorized address in the Connect Ack sequence; |
| 4531 | * authorization will assign the final address. |
| 4532 | */ |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4533 | if (udev->wusb == 0) { |
Oliver Neukum | 0d5ce77 | 2016-02-17 11:52:43 +0100 | [diff] [blame] | 4534 | for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4535 | retval = hub_set_address(udev, devnum); |
| 4536 | if (retval >= 0) |
| 4537 | break; |
| 4538 | msleep(200); |
| 4539 | } |
| 4540 | if (retval < 0) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4541 | if (retval != -ENODEV) |
| 4542 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", |
| 4543 | devnum, retval); |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4544 | goto fail; |
| 4545 | } |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4546 | if (udev->speed >= USB_SPEED_SUPER) { |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4547 | devnum = udev->devnum; |
| 4548 | dev_info(&udev->dev, |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4549 | "%s SuperSpeed%s USB device number %d using %s\n", |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4550 | (udev->config) ? "reset" : "new", |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4551 | (udev->speed == USB_SPEED_SUPER_PLUS) ? "Plus" : "", |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4552 | devnum, udev->bus->controller->driver->name); |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4553 | } |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4554 | |
| 4555 | /* cope with hardware quirkiness: |
| 4556 | * - let SET_ADDRESS settle, some device hardware wants it |
| 4557 | * - read ep0 maxpacket even for high and low speed, |
| 4558 | */ |
| 4559 | msleep(10); |
Dan Williams | 48fc7db | 2013-12-05 17:07:27 -0800 | [diff] [blame] | 4560 | /* use_new_scheme() checks the speed which may have |
| 4561 | * changed since the initial look so we cache the result |
| 4562 | * in did_new_scheme |
| 4563 | */ |
| 4564 | if (did_new_scheme) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4565 | break; |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4567 | |
| 4568 | retval = usb_get_device_descriptor(udev, 8); |
| 4569 | if (retval < 8) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4570 | if (retval != -ENODEV) |
| 4571 | dev_err(&udev->dev, |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 4572 | "device descriptor read/8, error %d\n", |
| 4573 | retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4574 | if (retval >= 0) |
| 4575 | retval = -EMSGSIZE; |
| 4576 | } else { |
| 4577 | retval = 0; |
| 4578 | break; |
| 4579 | } |
| 4580 | } |
| 4581 | if (retval) |
| 4582 | goto fail; |
| 4583 | |
Elric Fu | d8aec3d | 2012-03-26 21:16:02 +0800 | [diff] [blame] | 4584 | /* |
| 4585 | * Some superspeed devices have finished the link training process |
| 4586 | * and attached to a superspeed hub port, but the device descriptor |
| 4587 | * got from those devices show they aren't superspeed devices. Warm |
| 4588 | * reset the port attached by the devices can fix them. |
| 4589 | */ |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4590 | if ((udev->speed >= USB_SPEED_SUPER) && |
Elric Fu | d8aec3d | 2012-03-26 21:16:02 +0800 | [diff] [blame] | 4591 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
| 4592 | dev_err(&udev->dev, "got a wrong device descriptor, " |
| 4593 | "warm reset device\n"); |
| 4594 | hub_port_reset(hub, port1, udev, |
| 4595 | HUB_BH_RESET_TIME, true); |
| 4596 | retval = -EINVAL; |
| 4597 | goto fail; |
| 4598 | } |
| 4599 | |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 4600 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4601 | udev->speed >= USB_SPEED_SUPER) |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 4602 | i = 512; |
| 4603 | else |
| 4604 | i = udev->descriptor.bMaxPacketSize0; |
Kuninori Morimoto | 29cc889 | 2011-08-23 03:12:03 -0700 | [diff] [blame] | 4605 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
Alan Stern | 56626a7 | 2010-10-14 15:25:21 -0400 | [diff] [blame] | 4606 | if (udev->speed == USB_SPEED_LOW || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4607 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
Alan Stern | 56626a7 | 2010-10-14 15:25:21 -0400 | [diff] [blame] | 4608 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4609 | retval = -EMSGSIZE; |
| 4610 | goto fail; |
| 4611 | } |
Alan Stern | 56626a7 | 2010-10-14 15:25:21 -0400 | [diff] [blame] | 4612 | if (udev->speed == USB_SPEED_FULL) |
| 4613 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 4614 | else |
| 4615 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4616 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4617 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4618 | } |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4620 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
| 4621 | if (retval < (signed)sizeof(udev->descriptor)) { |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4622 | if (retval != -ENODEV) |
| 4623 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
| 4624 | retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4625 | if (retval >= 0) |
| 4626 | retval = -ENOMSG; |
| 4627 | goto fail; |
| 4628 | } |
| 4629 | |
Alan Stern | ad87e03 | 2015-12-10 15:27:21 -0500 | [diff] [blame] | 4630 | usb_detect_quirks(udev); |
| 4631 | |
Andiry Xu | 1ff4df5 | 2011-09-23 14:19:48 -0700 | [diff] [blame] | 4632 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
| 4633 | retval = usb_get_bos_descriptor(udev); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 4634 | if (!retval) { |
Sarah Sharp | d9b2099 | 2012-02-20 08:31:26 -0800 | [diff] [blame] | 4635 | udev->lpm_capable = usb_device_supports_lpm(udev); |
Sarah Sharp | 51e0a01 | 2012-02-20 12:02:19 -0800 | [diff] [blame] | 4636 | usb_set_lpm_parameters(udev); |
| 4637 | } |
Andiry Xu | 1ff4df5 | 2011-09-23 14:19:48 -0700 | [diff] [blame] | 4638 | } |
Andiry Xu | 3148bf0 | 2011-09-23 14:19:47 -0700 | [diff] [blame] | 4639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4640 | retval = 0; |
Alek Du | 48f2497 | 2010-06-04 15:47:55 +0800 | [diff] [blame] | 4641 | /* notify HCD that we have a device connected and addressed */ |
| 4642 | if (hcd->driver->update_device) |
| 4643 | hcd->driver->update_device(hcd, udev); |
Mathias Nyman | 890dae8 | 2013-09-30 17:26:31 +0300 | [diff] [blame] | 4644 | hub_set_initial_usb2_lpm_policy(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4645 | fail: |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 4646 | if (retval) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4647 | hub_port_disable(hub, port1, 0); |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4648 | update_devnum(udev, devnum); /* for disconnect processing */ |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 4649 | } |
Chris Bainbridge | feb26ac | 2016-04-25 13:48:38 +0100 | [diff] [blame] | 4650 | mutex_unlock(hcd->address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4651 | return retval; |
| 4652 | } |
| 4653 | |
| 4654 | static void |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4655 | check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4656 | { |
| 4657 | struct usb_qualifier_descriptor *qual; |
| 4658 | int status; |
| 4659 | |
Johan Hovold | 2a15938 | 2014-08-25 17:51:26 +0200 | [diff] [blame] | 4660 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
| 4661 | return; |
| 4662 | |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4663 | qual = kmalloc(sizeof *qual, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4664 | if (qual == NULL) |
| 4665 | return; |
| 4666 | |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4667 | status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4668 | qual, sizeof *qual); |
| 4669 | if (status == sizeof *qual) { |
| 4670 | dev_info(&udev->dev, "not running at top speed; " |
| 4671 | "connect to a high speed hub\n"); |
| 4672 | /* hub LEDs are probably harder to miss than syslog */ |
| 4673 | if (hub->has_indicators) { |
| 4674 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 4675 | queue_delayed_work(system_power_efficient_wq, |
| 4676 | &hub->leds, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4677 | } |
| 4678 | } |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 4679 | kfree(qual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4680 | } |
| 4681 | |
| 4682 | static unsigned |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4683 | hub_power_remaining(struct usb_hub *hub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4684 | { |
| 4685 | struct usb_device *hdev = hub->hdev; |
| 4686 | int remaining; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4687 | int port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4688 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4689 | if (!hub->limited_power) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4690 | return 0; |
| 4691 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4692 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
| 4693 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4694 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 4695 | struct usb_device *udev = port_dev->child; |
| 4696 | unsigned unit_load; |
| 4697 | int delta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4698 | |
| 4699 | if (!udev) |
| 4700 | continue; |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4701 | if (hub_is_superspeed(udev)) |
| 4702 | unit_load = 150; |
| 4703 | else |
| 4704 | unit_load = 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4705 | |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4706 | /* |
| 4707 | * Unconfigured devices may not use more than one unit load, |
| 4708 | * or 8mA for OTG ports |
| 4709 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4710 | if (udev->actconfig) |
Sebastian Andrzej Siewior | 8d8479d | 2012-12-18 15:25:46 +0100 | [diff] [blame] | 4711 | delta = usb_get_max_power(udev, udev->actconfig); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4712 | else if (port1 != udev->bus->otg_port || hdev->parent) |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4713 | delta = unit_load; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4714 | else |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4715 | delta = 8; |
| 4716 | if (delta > hub->mA_per_port) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4717 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
| 4718 | delta, hub->mA_per_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4719 | remaining -= delta; |
| 4720 | } |
| 4721 | if (remaining < 0) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4722 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4723 | -remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4724 | remaining = 0; |
| 4725 | } |
| 4726 | return remaining; |
| 4727 | } |
| 4728 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4729 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
| 4730 | u16 portchange) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4731 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4732 | int status, i; |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4733 | unsigned unit_load; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4734 | struct usb_device *hdev = hub->hdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4735 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4736 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4737 | struct usb_device *udev = port_dev->child; |
Oliver Neukum | 5ee0f80 | 2014-07-14 15:39:49 +0200 | [diff] [blame] | 4738 | static int unreliable_port = -1; |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 4739 | |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 4740 | /* Disconnect any existing devices under this port */ |
Peter Chen | b76baa8 | 2012-11-09 09:44:43 +0800 | [diff] [blame] | 4741 | if (udev) { |
Peter Chen | b2108f1 | 2014-11-04 11:14:31 +0800 | [diff] [blame] | 4742 | if (hcd->usb_phy && !hdev->parent) |
Antoine Tenart | 3d46e73 | 2014-09-24 23:05:50 +0400 | [diff] [blame] | 4743 | usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4744 | usb_disconnect(&port_dev->child); |
Peter Chen | b76baa8 | 2012-11-09 09:44:43 +0800 | [diff] [blame] | 4745 | } |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 4746 | |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 4747 | /* We can forget about a "removed" device when there's a physical |
| 4748 | * disconnect or the connect status changes. |
| 4749 | */ |
| 4750 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 4751 | (portchange & USB_PORT_STAT_C_CONNECTION)) |
| 4752 | clear_bit(port1, hub->removed_bits); |
| 4753 | |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 4754 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
| 4755 | USB_PORT_STAT_C_ENABLE)) { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 4756 | status = hub_port_debounce_be_stable(hub, port1); |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 4757 | if (status < 0) { |
Oliver Neukum | 5ee0f80 | 2014-07-14 15:39:49 +0200 | [diff] [blame] | 4758 | if (status != -ENODEV && |
| 4759 | port1 != unreliable_port && |
| 4760 | printk_ratelimit()) |
Takashi Iwai | dd5f500 | 2014-08-19 17:37:55 +0200 | [diff] [blame] | 4761 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 4762 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
Oliver Neukum | 5ee0f80 | 2014-07-14 15:39:49 +0200 | [diff] [blame] | 4763 | unreliable_port = port1; |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 4764 | } else { |
| 4765 | portstatus = status; |
| 4766 | } |
| 4767 | } |
| 4768 | |
Alan Stern | 253e057 | 2009-10-27 15:20:13 -0400 | [diff] [blame] | 4769 | /* Return now if debouncing failed or nothing is connected or |
| 4770 | * the device was "removed". |
| 4771 | */ |
| 4772 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
| 4773 | test_bit(port1, hub->removed_bits)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4774 | |
Deepak Das | fbaecff | 2015-01-21 23:39:58 +0530 | [diff] [blame] | 4775 | /* |
| 4776 | * maybe switch power back on (e.g. root hub was reset) |
| 4777 | * but only if the port isn't owned by someone else. |
| 4778 | */ |
Dan Williams | 9262c19 | 2014-05-20 18:08:12 -0700 | [diff] [blame] | 4779 | if (hub_is_port_power_switchable(hub) |
Deepak Das | fbaecff | 2015-01-21 23:39:58 +0530 | [diff] [blame] | 4780 | && !port_is_power_on(hub, portstatus) |
| 4781 | && !port_dev->port_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4782 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 4783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4784 | if (portstatus & USB_PORT_STAT_ENABLE) |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4785 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4786 | return; |
| 4787 | } |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4788 | if (hub_is_superspeed(hub->hdev)) |
| 4789 | unit_load = 150; |
| 4790 | else |
| 4791 | unit_load = 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4792 | |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4793 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4794 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4795 | |
| 4796 | /* reallocate for each attempt, since references |
| 4797 | * to the previous one can escape in various ways |
| 4798 | */ |
| 4799 | udev = usb_alloc_dev(hdev, hdev->bus, port1); |
| 4800 | if (!udev) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4801 | dev_err(&port_dev->dev, |
| 4802 | "couldn't allocate usb_device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4803 | goto done; |
| 4804 | } |
| 4805 | |
| 4806 | usb_set_device_state(udev, USB_STATE_POWERED); |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4807 | udev->bus_mA = hub->mA_per_port; |
Alan Stern | b6956ff | 2006-08-30 15:46:48 -0400 | [diff] [blame] | 4808 | udev->level = hdev->level + 1; |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4809 | udev->wusb = hub_is_wusb(hub); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 4810 | |
Mathias Nyman | 8a1b272 | 2015-12-10 09:59:25 +0200 | [diff] [blame] | 4811 | /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ |
Sarah Sharp | 131dec3 | 2010-12-06 21:00:19 -0800 | [diff] [blame] | 4812 | if (hub_is_superspeed(hub->hdev)) |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 4813 | udev->speed = USB_SPEED_SUPER; |
| 4814 | else |
| 4815 | udev->speed = USB_SPEED_UNKNOWN; |
| 4816 | |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4817 | choose_devnum(udev); |
Andiry Xu | c8d4af8 | 2010-10-14 07:22:51 -0700 | [diff] [blame] | 4818 | if (udev->devnum <= 0) { |
| 4819 | status = -ENOTCONN; /* Don't retry */ |
| 4820 | goto loop; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 4821 | } |
| 4822 | |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 4823 | /* reset (non-USB 3.0 devices) and get descriptor */ |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4824 | usb_lock_port(port_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4825 | status = hub_port_init(hub, udev, port1, i); |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4826 | usb_unlock_port(port_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4827 | if (status < 0) |
| 4828 | goto loop; |
| 4829 | |
Phil Dibowitz | 93362a8 | 2010-07-22 00:05:01 +0200 | [diff] [blame] | 4830 | if (udev->quirks & USB_QUIRK_DELAY_INIT) |
| 4831 | msleep(1000); |
| 4832 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4833 | /* consecutive bus-powered hubs aren't reliable; they can |
| 4834 | * violate the voltage drop budget. if the new child has |
| 4835 | * a "powered" LED, users should notice we didn't enable it |
| 4836 | * (without reading syslog), even without per-port LEDs |
| 4837 | * on the parent. |
| 4838 | */ |
| 4839 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
Sebastian Andrzej Siewior | 430ee58 | 2012-12-18 15:25:47 +0100 | [diff] [blame] | 4840 | && udev->bus_mA <= unit_load) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4841 | u16 devstat; |
| 4842 | |
| 4843 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, |
| 4844 | &devstat); |
Alan Stern | 15b7336 | 2013-07-30 15:35:40 -0400 | [diff] [blame] | 4845 | if (status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4846 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
| 4847 | goto loop_disable; |
| 4848 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4849 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| 4850 | dev_err(&udev->dev, |
| 4851 | "can't connect bus-powered hub " |
| 4852 | "to this port\n"); |
| 4853 | if (hub->has_indicators) { |
| 4854 | hub->indicator[port1-1] = |
| 4855 | INDICATOR_AMBER_BLINK; |
Shaibal Dutta | 22f6a0f | 2014-02-01 19:16:46 -0800 | [diff] [blame] | 4856 | queue_delayed_work( |
| 4857 | system_power_efficient_wq, |
| 4858 | &hub->leds, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4859 | } |
| 4860 | status = -ENOTCONN; /* Don't retry */ |
| 4861 | goto loop_disable; |
| 4862 | } |
| 4863 | } |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4865 | /* check for devices running slower than they could */ |
| 4866 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
| 4867 | && udev->speed == USB_SPEED_FULL |
| 4868 | && highspeed_hubs != 0) |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 4869 | check_highspeed(hub, udev, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4870 | |
Greg Kroah-Hartman | fa28618 | 2012-05-14 09:20:37 -0700 | [diff] [blame] | 4871 | /* Store the parent's children[] pointer. At this point |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4872 | * udev becomes globally accessible, although presumably |
| 4873 | * no one will look at it until hdev is unlocked. |
| 4874 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4875 | status = 0; |
| 4876 | |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 4877 | mutex_lock(&usb_port_peer_mutex); |
| 4878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4879 | /* We mustn't add new devices if the parent hub has |
| 4880 | * been disconnected; we would race with the |
| 4881 | * recursively_mark_NOTATTACHED() routine. |
| 4882 | */ |
| 4883 | spin_lock_irq(&device_state_lock); |
| 4884 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 4885 | status = -ENOTCONN; |
| 4886 | else |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4887 | port_dev->child = udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4888 | spin_unlock_irq(&device_state_lock); |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 4889 | mutex_unlock(&usb_port_peer_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4890 | |
| 4891 | /* Run it through the hoops (find a driver, etc) */ |
| 4892 | if (!status) { |
| 4893 | status = usb_new_device(udev); |
| 4894 | if (status) { |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 4895 | mutex_lock(&usb_port_peer_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4896 | spin_lock_irq(&device_state_lock); |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4897 | port_dev->child = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4898 | spin_unlock_irq(&device_state_lock); |
Dan Williams | d8521af | 2014-05-20 18:08:28 -0700 | [diff] [blame] | 4899 | mutex_unlock(&usb_port_peer_mutex); |
Tony Zheng | 01ed67d | 2014-10-17 19:43:02 +0800 | [diff] [blame] | 4900 | } else { |
| 4901 | if (hcd->usb_phy && !hdev->parent) |
| 4902 | usb_phy_notify_connect(hcd->usb_phy, |
| 4903 | udev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4904 | } |
| 4905 | } |
| 4906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4907 | if (status) |
| 4908 | goto loop_disable; |
| 4909 | |
| 4910 | status = hub_power_remaining(hub); |
| 4911 | if (status) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4912 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4913 | |
| 4914 | return; |
| 4915 | |
| 4916 | loop_disable: |
| 4917 | hub_port_disable(hub, port1, 1); |
| 4918 | loop: |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 4919 | usb_ep0_reinit(udev); |
Alan Stern | 3b29b68 | 2011-02-22 09:53:41 -0500 | [diff] [blame] | 4920 | release_devnum(udev); |
Herbert Xu | f7410ce | 2010-01-10 20:15:03 +1100 | [diff] [blame] | 4921 | hub_free_dev(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4922 | usb_put_dev(udev); |
Vikram Pandita | ffcdc18 | 2007-05-25 21:31:07 -0700 | [diff] [blame] | 4923 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4924 | break; |
| 4925 | } |
Alan Stern | 3a31155 | 2008-05-20 16:58:29 -0400 | [diff] [blame] | 4926 | if (hub->hdev->parent || |
| 4927 | !hcd->driver->port_handed_over || |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4928 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
| 4929 | if (status != -ENOTCONN && status != -ENODEV) |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 4930 | dev_err(&port_dev->dev, |
| 4931 | "unable to enumerate USB device\n"); |
Alan Stern | e9e88fb | 2013-03-27 16:14:01 -0400 | [diff] [blame] | 4932 | } |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 4933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4934 | done: |
| 4935 | hub_port_disable(hub, port1, 1); |
Balaji Rao | 90da096 | 2007-11-22 01:58:14 +0530 | [diff] [blame] | 4936 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
| 4937 | hcd->driver->relinquish_port(hcd, port1); |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4939 | } |
| 4940 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4941 | /* Handle physical or logical connection change events. |
| 4942 | * This routine is called when: |
| 4943 | * a port connection-change occurs; |
| 4944 | * a port enable-change occurs (often caused by EMI); |
| 4945 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
| 4946 | * a firmware download) |
| 4947 | * caller already locked the hub |
| 4948 | */ |
| 4949 | static void hub_port_connect_change(struct usb_hub *hub, int port1, |
| 4950 | u16 portstatus, u16 portchange) |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4951 | __must_hold(&port_dev->status_lock) |
Sarah Sharp | 714b07b | 2012-01-24 13:53:18 -0800 | [diff] [blame] | 4952 | { |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4953 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 4954 | struct usb_device *udev = port_dev->child; |
| 4955 | int status = -ENODEV; |
Sarah Sharp | 714b07b | 2012-01-24 13:53:18 -0800 | [diff] [blame] | 4956 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4957 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
| 4958 | portchange, portspeed(hub, portstatus)); |
| 4959 | |
| 4960 | if (hub->has_indicators) { |
| 4961 | set_port_led(hub, port1, HUB_LED_AUTO); |
| 4962 | hub->indicator[port1-1] = INDICATOR_AUTO; |
Sarah Sharp | 4ee823b | 2011-11-14 18:00:01 -0800 | [diff] [blame] | 4963 | } |
| 4964 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4965 | #ifdef CONFIG_USB_OTG |
| 4966 | /* during HNP, don't repeat the debounce */ |
| 4967 | if (hub->hdev->bus->is_b_host) |
| 4968 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
| 4969 | USB_PORT_STAT_C_ENABLE); |
| 4970 | #endif |
Sarah Sharp | 714b07b | 2012-01-24 13:53:18 -0800 | [diff] [blame] | 4971 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4972 | /* Try to resuscitate an existing device */ |
| 4973 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
| 4974 | udev->state != USB_STATE_NOTATTACHED) { |
| 4975 | if (portstatus & USB_PORT_STAT_ENABLE) { |
| 4976 | status = 0; /* Nothing to do */ |
Rafael J. Wysocki | ceb6c9c | 2014-11-29 23:47:05 +0100 | [diff] [blame] | 4977 | #ifdef CONFIG_PM |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4978 | } else if (udev->state == USB_STATE_SUSPENDED && |
| 4979 | udev->persist_enabled) { |
| 4980 | /* For a suspended device, treat this as a |
| 4981 | * remote wakeup event. |
| 4982 | */ |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4983 | usb_unlock_port(port_dev); |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4984 | status = usb_remote_wakeup(udev); |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4985 | usb_lock_port(port_dev); |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4986 | #endif |
| 4987 | } else { |
| 4988 | /* Don't resuscitate */; |
| 4989 | } |
Sarah Sharp | 714b07b | 2012-01-24 13:53:18 -0800 | [diff] [blame] | 4990 | } |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4991 | clear_bit(port1, hub->change_bits); |
| 4992 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4993 | /* successfully revalidated the connection */ |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4994 | if (status == 0) |
| 4995 | return; |
| 4996 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4997 | usb_unlock_port(port_dev); |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 4998 | hub_port_connect(hub, port1, portstatus, portchange); |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 4999 | usb_lock_port(port_dev); |
Sarah Sharp | 714b07b | 2012-01-24 13:53:18 -0800 | [diff] [blame] | 5000 | } |
| 5001 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5002 | static void port_event(struct usb_hub *hub, int port1) |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5003 | __must_hold(&port_dev->status_lock) |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5004 | { |
Zhuang Jin Can | 7671bd1 | 2015-01-26 23:30:39 +0800 | [diff] [blame] | 5005 | int connect_change; |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5006 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
| 5007 | struct usb_device *udev = port_dev->child; |
| 5008 | struct usb_device *hdev = hub->hdev; |
| 5009 | u16 portstatus, portchange; |
| 5010 | |
| 5011 | connect_change = test_bit(port1, hub->change_bits); |
| 5012 | clear_bit(port1, hub->event_bits); |
| 5013 | clear_bit(port1, hub->wakeup_bits); |
| 5014 | |
| 5015 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) |
| 5016 | return; |
| 5017 | |
| 5018 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 5019 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
| 5020 | connect_change = 1; |
| 5021 | } |
| 5022 | |
| 5023 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 5024 | if (!connect_change) |
| 5025 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", |
| 5026 | portstatus); |
| 5027 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
| 5028 | |
| 5029 | /* |
| 5030 | * EM interference sometimes causes badly shielded USB devices |
| 5031 | * to be shutdown by the hub, this hack enables them again. |
| 5032 | * Works at least with mouse driver. |
| 5033 | */ |
| 5034 | if (!(portstatus & USB_PORT_STAT_ENABLE) |
| 5035 | && !connect_change && udev) { |
| 5036 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); |
| 5037 | connect_change = 1; |
| 5038 | } |
| 5039 | } |
| 5040 | |
| 5041 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
| 5042 | u16 status = 0, unused; |
| 5043 | |
| 5044 | dev_dbg(&port_dev->dev, "over-current change\n"); |
| 5045 | usb_clear_port_feature(hdev, port1, |
| 5046 | USB_PORT_FEAT_C_OVER_CURRENT); |
| 5047 | msleep(100); /* Cool down */ |
| 5048 | hub_power_on(hub, true); |
| 5049 | hub_port_status(hub, port1, &status, &unused); |
| 5050 | if (status & USB_PORT_STAT_OVERCURRENT) |
| 5051 | dev_err(&port_dev->dev, "over-current condition\n"); |
| 5052 | } |
| 5053 | |
| 5054 | if (portchange & USB_PORT_STAT_C_RESET) { |
| 5055 | dev_dbg(&port_dev->dev, "reset change\n"); |
| 5056 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); |
| 5057 | } |
| 5058 | if ((portchange & USB_PORT_STAT_C_BH_RESET) |
| 5059 | && hub_is_superspeed(hdev)) { |
| 5060 | dev_dbg(&port_dev->dev, "warm reset change\n"); |
| 5061 | usb_clear_port_feature(hdev, port1, |
| 5062 | USB_PORT_FEAT_C_BH_PORT_RESET); |
| 5063 | } |
| 5064 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
| 5065 | dev_dbg(&port_dev->dev, "link state change\n"); |
| 5066 | usb_clear_port_feature(hdev, port1, |
| 5067 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
| 5068 | } |
| 5069 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { |
| 5070 | dev_warn(&port_dev->dev, "config error\n"); |
| 5071 | usb_clear_port_feature(hdev, port1, |
| 5072 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
| 5073 | } |
| 5074 | |
Dan Williams | 097a155 | 2014-05-20 18:09:20 -0700 | [diff] [blame] | 5075 | /* skip port actions that require the port to be powered on */ |
| 5076 | if (!pm_runtime_active(&port_dev->dev)) |
| 5077 | return; |
| 5078 | |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5079 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
| 5080 | connect_change = 1; |
| 5081 | |
| 5082 | /* |
| 5083 | * Warm reset a USB3 protocol port if it's in |
| 5084 | * SS.Inactive state. |
| 5085 | */ |
Dan Williams | 3cd12f9 | 2014-05-29 12:58:46 -0700 | [diff] [blame] | 5086 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5087 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
| 5088 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) |
| 5089 | || udev->state == USB_STATE_NOTATTACHED) { |
| 5090 | if (hub_port_reset(hub, port1, NULL, |
| 5091 | HUB_BH_RESET_TIME, true) < 0) |
| 5092 | hub_port_disable(hub, port1, 1); |
Zhuang Jin Can | 7671bd1 | 2015-01-26 23:30:39 +0800 | [diff] [blame] | 5093 | } else { |
| 5094 | usb_unlock_port(port_dev); |
| 5095 | usb_lock_device(udev); |
| 5096 | usb_reset_device(udev); |
| 5097 | usb_unlock_device(udev); |
| 5098 | usb_lock_port(port_dev); |
| 5099 | connect_change = 0; |
| 5100 | } |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5101 | } |
| 5102 | |
| 5103 | if (connect_change) |
| 5104 | hub_port_connect_change(hub, port1, portstatus, portchange); |
| 5105 | } |
| 5106 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5107 | static void hub_event(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5108 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5109 | struct usb_device *hdev; |
| 5110 | struct usb_interface *intf; |
| 5111 | struct usb_hub *hub; |
| 5112 | struct device *hub_dev; |
| 5113 | u16 hubstatus; |
| 5114 | u16 hubchange; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5115 | int i, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5116 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5117 | hub = container_of(work, struct usb_hub, events); |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5118 | hdev = hub->hdev; |
| 5119 | hub_dev = hub->intfdev; |
| 5120 | intf = to_usb_interface(hub_dev); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5121 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5122 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
| 5123 | hdev->state, hdev->maxchild, |
| 5124 | /* NOTE: expects max 15 ports... */ |
| 5125 | (u16) hub->change_bits[0], |
| 5126 | (u16) hub->event_bits[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5127 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5128 | /* Lock the device, then check to see if we were |
| 5129 | * disconnected while waiting for the lock to succeed. */ |
| 5130 | usb_lock_device(hdev); |
| 5131 | if (unlikely(hub->disconnected)) |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5132 | goto out_hdev_lock; |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5133 | |
| 5134 | /* If the hub has died, clean up after it */ |
| 5135 | if (hdev->state == USB_STATE_NOTATTACHED) { |
| 5136 | hub->error = -ENODEV; |
| 5137 | hub_quiesce(hub, HUB_DISCONNECT); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5138 | goto out_hdev_lock; |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5139 | } |
| 5140 | |
| 5141 | /* Autoresume */ |
| 5142 | ret = usb_autopm_get_interface(intf); |
| 5143 | if (ret) { |
| 5144 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5145 | goto out_hdev_lock; |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5146 | } |
| 5147 | |
| 5148 | /* If this is an inactive hub, do nothing */ |
| 5149 | if (hub->quiescing) |
| 5150 | goto out_autopm; |
| 5151 | |
| 5152 | if (hub->error) { |
| 5153 | dev_dbg(hub_dev, "resetting for error %d\n", hub->error); |
| 5154 | |
| 5155 | ret = usb_reset_device(hdev); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 5156 | if (ret) { |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5157 | dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
| 5158 | goto out_autopm; |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 5159 | } |
| 5160 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5161 | hub->nerrors = 0; |
| 5162 | hub->error = 0; |
| 5163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5164 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5165 | /* deal with port status changes */ |
| 5166 | for (i = 1; i <= hdev->maxchild; i++) { |
| 5167 | struct usb_port *port_dev = hub->ports[i - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5168 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5169 | if (test_bit(i, hub->event_bits) |
| 5170 | || test_bit(i, hub->change_bits) |
| 5171 | || test_bit(i, hub->wakeup_bits)) { |
| 5172 | /* |
| 5173 | * The get_noresume and barrier ensure that if |
| 5174 | * the port was in the process of resuming, we |
| 5175 | * flush that work and keep the port active for |
| 5176 | * the duration of the port_event(). However, |
| 5177 | * if the port is runtime pm suspended |
| 5178 | * (powered-off), we leave it in that state, run |
| 5179 | * an abbreviated port_event(), and move on. |
| 5180 | */ |
| 5181 | pm_runtime_get_noresume(&port_dev->dev); |
| 5182 | pm_runtime_barrier(&port_dev->dev); |
| 5183 | usb_lock_port(port_dev); |
| 5184 | port_event(hub, i); |
| 5185 | usb_unlock_port(port_dev); |
| 5186 | pm_runtime_put_sync(&port_dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5187 | } |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5189 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5190 | /* deal with hub status changes */ |
| 5191 | if (test_and_clear_bit(0, hub->event_bits) == 0) |
| 5192 | ; /* do nothing */ |
| 5193 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
| 5194 | dev_err(hub_dev, "get_hub_status failed\n"); |
| 5195 | else { |
| 5196 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
| 5197 | dev_dbg(hub_dev, "power change\n"); |
| 5198 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
| 5199 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 5200 | /* FIXME: Is this always true? */ |
| 5201 | hub->limited_power = 1; |
| 5202 | else |
| 5203 | hub->limited_power = 0; |
Dan Williams | af376a4 | 2014-05-20 18:09:15 -0700 | [diff] [blame] | 5204 | } |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5205 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
| 5206 | u16 status = 0; |
| 5207 | u16 unused; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5208 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5209 | dev_dbg(hub_dev, "over-current change\n"); |
| 5210 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
| 5211 | msleep(500); /* Cool down */ |
| 5212 | hub_power_on(hub, true); |
| 5213 | hub_hub_status(hub, &status, &unused); |
| 5214 | if (status & HUB_STATUS_OVERCURRENT) |
| 5215 | dev_err(hub_dev, "over-current condition\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5216 | } |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5218 | |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5219 | out_autopm: |
| 5220 | /* Balance the usb_autopm_get_interface() above */ |
| 5221 | usb_autopm_put_interface_no_suspend(intf); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5222 | out_hdev_lock: |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5223 | usb_unlock_device(hdev); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5224 | |
| 5225 | /* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
| 5226 | usb_autopm_put_interface(intf); |
Petr Mladek | eb6e292 | 2014-09-19 17:32:20 +0200 | [diff] [blame] | 5227 | kref_put(&hub->kref, hub_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5228 | } |
| 5229 | |
Németh Márton | 1e927d9 | 2010-01-10 15:34:53 +0100 | [diff] [blame] | 5230 | static const struct usb_device_id hub_id_table[] = { |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 5231 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 5232 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
Ming Lei | e6f30de | 2012-10-24 11:59:24 +0800 | [diff] [blame] | 5233 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
| 5234 | .bInterfaceClass = USB_CLASS_HUB, |
| 5235 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5236 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
| 5237 | .bDeviceClass = USB_CLASS_HUB}, |
| 5238 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
| 5239 | .bInterfaceClass = USB_CLASS_HUB}, |
| 5240 | { } /* Terminating entry */ |
| 5241 | }; |
| 5242 | |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 5243 | MODULE_DEVICE_TABLE(usb, hub_id_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5244 | |
| 5245 | static struct usb_driver hub_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5246 | .name = "hub", |
| 5247 | .probe = hub_probe, |
| 5248 | .disconnect = hub_disconnect, |
| 5249 | .suspend = hub_suspend, |
| 5250 | .resume = hub_resume, |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 5251 | .reset_resume = hub_reset_resume, |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 5252 | .pre_reset = hub_pre_reset, |
| 5253 | .post_reset = hub_post_reset, |
Andi Kleen | c532b29 | 2010-06-01 23:04:41 +0200 | [diff] [blame] | 5254 | .unlocked_ioctl = hub_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5255 | .id_table = hub_id_table, |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 5256 | .supports_autosuspend = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5257 | }; |
| 5258 | |
| 5259 | int usb_hub_init(void) |
| 5260 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5261 | if (usb_register(&hub_driver) < 0) { |
| 5262 | printk(KERN_ERR "%s: can't register hub driver\n", |
| 5263 | usbcore_name); |
| 5264 | return -1; |
| 5265 | } |
| 5266 | |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5267 | /* |
| 5268 | * The workqueue needs to be freezable to avoid interfering with |
| 5269 | * USB-PERSIST port handover. Otherwise it might see that a full-speed |
| 5270 | * device was gone before the EHCI controller had handed its port |
| 5271 | * over to the companion full-speed controller. |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5272 | */ |
Petr Mladek | 638139e | 2014-09-19 17:32:24 +0200 | [diff] [blame] | 5273 | hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5274 | if (hub_wq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5275 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5276 | |
| 5277 | /* Fall through if kernel_thread failed */ |
| 5278 | usb_deregister(&hub_driver); |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5279 | pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5280 | |
| 5281 | return -1; |
| 5282 | } |
| 5283 | |
| 5284 | void usb_hub_cleanup(void) |
| 5285 | { |
Petr Mladek | 32a69589 | 2014-09-19 17:32:21 +0200 | [diff] [blame] | 5286 | destroy_workqueue(hub_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5287 | |
| 5288 | /* |
| 5289 | * Hub resources are freed for us by usb_deregister. It calls |
| 5290 | * usb_driver_purge on every device which in turn calls that |
| 5291 | * devices disconnect function if it is using this driver. |
| 5292 | * The hub_disconnect function takes care of releasing the |
| 5293 | * individual hub resources. -greg |
| 5294 | */ |
| 5295 | usb_deregister(&hub_driver); |
| 5296 | } /* usb_hub_cleanup() */ |
| 5297 | |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5298 | static int descriptors_changed(struct usb_device *udev, |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5299 | struct usb_device_descriptor *old_device_descriptor, |
| 5300 | struct usb_host_bos *old_bos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5301 | { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5302 | int changed = 0; |
| 5303 | unsigned index; |
| 5304 | unsigned serial_len = 0; |
| 5305 | unsigned len; |
| 5306 | unsigned old_length; |
| 5307 | int length; |
| 5308 | char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5309 | |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5310 | if (memcmp(&udev->descriptor, old_device_descriptor, |
| 5311 | sizeof(*old_device_descriptor)) != 0) |
| 5312 | return 1; |
| 5313 | |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5314 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
| 5315 | return 1; |
| 5316 | if (udev->bos) { |
Xenia Ragiadakou | b9a1048 | 2013-08-31 04:40:49 +0300 | [diff] [blame] | 5317 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
| 5318 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5319 | return 1; |
Xenia Ragiadakou | b9a1048 | 2013-08-31 04:40:49 +0300 | [diff] [blame] | 5320 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5321 | return 1; |
| 5322 | } |
| 5323 | |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5324 | /* Since the idVendor, idProduct, and bcdDevice values in the |
| 5325 | * device descriptor haven't changed, we will assume the |
| 5326 | * Manufacturer and Product strings haven't changed either. |
| 5327 | * But the SerialNumber string could be different (e.g., a |
| 5328 | * different flash card of the same brand). |
| 5329 | */ |
| 5330 | if (udev->serial) |
| 5331 | serial_len = strlen(udev->serial) + 1; |
| 5332 | |
| 5333 | len = serial_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5334 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5335 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 5336 | len = max(len, old_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5337 | } |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5338 | |
Oliver Neukum | 0cc1a51 | 2008-01-10 10:31:48 +0100 | [diff] [blame] | 5339 | buf = kmalloc(len, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5340 | if (buf == NULL) { |
| 5341 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); |
| 5342 | /* assume the worst */ |
| 5343 | return 1; |
| 5344 | } |
| 5345 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5346 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5347 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
| 5348 | old_length); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5349 | if (length != old_length) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5350 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
| 5351 | index, length); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5352 | changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5353 | break; |
| 5354 | } |
Chase Metzger | 039b330 | 2015-08-18 20:36:58 -0700 | [diff] [blame] | 5355 | if (memcmp(buf, udev->rawdescriptors[index], old_length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5356 | != 0) { |
| 5357 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5358 | index, |
| 5359 | ((struct usb_config_descriptor *) buf)-> |
| 5360 | bConfigurationValue); |
| 5361 | changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5362 | break; |
| 5363 | } |
| 5364 | } |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5365 | |
| 5366 | if (!changed && serial_len) { |
| 5367 | length = usb_string(udev, udev->descriptor.iSerialNumber, |
| 5368 | buf, serial_len); |
| 5369 | if (length + 1 != serial_len) { |
| 5370 | dev_dbg(&udev->dev, "serial string error %d\n", |
| 5371 | length); |
| 5372 | changed = 1; |
| 5373 | } else if (memcmp(buf, udev->serial, length) != 0) { |
| 5374 | dev_dbg(&udev->dev, "serial string changed\n"); |
| 5375 | changed = 1; |
| 5376 | } |
| 5377 | } |
| 5378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5379 | kfree(buf); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 5380 | return changed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5381 | } |
| 5382 | |
| 5383 | /** |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5384 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5385 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 5386 | * |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5387 | * WARNING - don't use this routine to reset a composite device |
| 5388 | * (one with multiple interfaces owned by separate drivers)! |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5389 | * Use usb_reset_device() instead. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5390 | * |
| 5391 | * Do a port reset, reassign the device's address, and establish its |
| 5392 | * former operating configuration. If the reset fails, or the device's |
| 5393 | * descriptors change from their values before the reset, or the original |
| 5394 | * configuration and altsettings cannot be restored, a flag will be set |
Petr Mladek | 37ebb54 | 2014-09-19 17:32:23 +0200 | [diff] [blame] | 5395 | * telling hub_wq to pretend the device has been disconnected and then |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5396 | * re-connected. All drivers will be unbound, and the device will be |
| 5397 | * re-enumerated and probed all over again. |
| 5398 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5399 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5400 | * flagged for logical disconnection, or some other negative error code |
| 5401 | * if the reset wasn't even attempted. |
| 5402 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5403 | * Note: |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5404 | * The caller must own the device lock and the port lock, the latter is |
| 5405 | * taken by usb_reset_device(). For example, it's safe to use |
| 5406 | * usb_reset_device() from a driver probe() routine after downloading |
| 5407 | * new firmware. For calls that might not occur during probe(), drivers |
| 5408 | * should lock the device using usb_lock_device_for_reset(). |
Alan Stern | 6bc6cff | 2007-05-04 11:53:03 -0400 | [diff] [blame] | 5409 | * |
| 5410 | * Locking exception: This routine may also be called from within an |
| 5411 | * autoresume handler. Such usage won't conflict with other tasks |
| 5412 | * holding the device lock because these tasks should always call |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5413 | * usb_autopm_resume_device(), thereby preventing any unwanted |
| 5414 | * autoresume. The autoresume handler is expected to have already |
| 5415 | * acquired the port lock before calling this routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5416 | */ |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5417 | static int usb_reset_and_verify_device(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5418 | { |
| 5419 | struct usb_device *parent_hdev = udev->parent; |
| 5420 | struct usb_hub *parent_hub; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5421 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5422 | struct usb_device_descriptor descriptor = udev->descriptor; |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5423 | struct usb_host_bos *bos; |
Hans de Goede | 7a7b562 | 2013-11-08 16:37:26 +0100 | [diff] [blame] | 5424 | int i, j, ret = 0; |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 5425 | int port1 = udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5426 | |
| 5427 | if (udev->state == USB_STATE_NOTATTACHED || |
| 5428 | udev->state == USB_STATE_SUSPENDED) { |
| 5429 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 5430 | udev->state); |
| 5431 | return -EINVAL; |
| 5432 | } |
| 5433 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5434 | if (!parent_hdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5435 | return -EISDIR; |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5436 | |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 5437 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5438 | |
Sarah Sharp | dcc01c0 | 2013-09-30 17:26:29 +0300 | [diff] [blame] | 5439 | /* Disable USB2 hardware LPM. |
| 5440 | * It will be re-enabled by the enumeration process. |
| 5441 | */ |
| 5442 | if (udev->usb2_hw_lpm_enabled == 1) |
| 5443 | usb_set_usb2_hardware_lpm(udev, 0); |
| 5444 | |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 5445 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
| 5446 | * settings. Device-initiated LPM settings, and system exit latency |
| 5447 | * settings are cleared when the device is reset, so we have to set |
| 5448 | * them up again. |
Sarah Sharp | 6d1d051 | 2012-07-03 22:49:04 -0700 | [diff] [blame] | 5449 | */ |
| 5450 | ret = usb_unlocked_disable_lpm(udev); |
| 5451 | if (ret) { |
| 5452 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); |
Hans Yang | 464ad8c | 2015-12-01 16:54:59 +0800 | [diff] [blame] | 5453 | goto re_enumerate_no_bos; |
Sarah Sharp | 6d1d051 | 2012-07-03 22:49:04 -0700 | [diff] [blame] | 5454 | } |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 5455 | ret = usb_disable_ltm(udev); |
| 5456 | if (ret) { |
| 5457 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", |
| 5458 | __func__); |
Hans Yang | 464ad8c | 2015-12-01 16:54:59 +0800 | [diff] [blame] | 5459 | goto re_enumerate_no_bos; |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 5460 | } |
Sarah Sharp | 6d1d051 | 2012-07-03 22:49:04 -0700 | [diff] [blame] | 5461 | |
Hans Yang | 464ad8c | 2015-12-01 16:54:59 +0800 | [diff] [blame] | 5462 | bos = udev->bos; |
Greg Kroah-Hartman | e5bdfd5 | 2016-02-20 14:19:34 -0800 | [diff] [blame] | 5463 | udev->bos = NULL; |
Hans Yang | 464ad8c | 2015-12-01 16:54:59 +0800 | [diff] [blame] | 5464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5465 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
| 5466 | |
| 5467 | /* ep0 maxpacket size may change; let the HCD know about it. |
| 5468 | * Other endpoints will be handled by re-enumeration. */ |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 5469 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5470 | ret = hub_port_init(parent_hub, udev, port1, i); |
Alan Stern | dd4dd19 | 2007-05-04 11:55:54 -0400 | [diff] [blame] | 5471 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5472 | break; |
| 5473 | } |
Alan Stern | d5cbad4 | 2006-08-11 16:52:39 -0400 | [diff] [blame] | 5474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5475 | if (ret < 0) |
| 5476 | goto re_enumerate; |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 5477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5478 | /* Device might have changed firmware (DFU or similar) */ |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5479 | if (descriptors_changed(udev, &descriptor, bos)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5480 | dev_info(&udev->dev, "device firmware changed\n"); |
| 5481 | udev->descriptor = descriptor; /* for disconnect() calls */ |
| 5482 | goto re_enumerate; |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 5483 | } |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 5484 | |
| 5485 | /* Restore the device's previous configuration */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5486 | if (!udev->actconfig) |
| 5487 | goto done; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5488 | |
Sarah Sharp | d673bfc | 2010-10-15 08:55:24 -0700 | [diff] [blame] | 5489 | mutex_lock(hcd->bandwidth_mutex); |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5490 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
| 5491 | if (ret < 0) { |
| 5492 | dev_warn(&udev->dev, |
| 5493 | "Busted HC? Not enough HCD resources for " |
| 5494 | "old configuration.\n"); |
Sarah Sharp | d673bfc | 2010-10-15 08:55:24 -0700 | [diff] [blame] | 5495 | mutex_unlock(hcd->bandwidth_mutex); |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5496 | goto re_enumerate; |
| 5497 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5498 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 5499 | USB_REQ_SET_CONFIGURATION, 0, |
| 5500 | udev->actconfig->desc.bConfigurationValue, 0, |
| 5501 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 5502 | if (ret < 0) { |
| 5503 | dev_err(&udev->dev, |
| 5504 | "can't restore configuration #%d (error=%d)\n", |
| 5505 | udev->actconfig->desc.bConfigurationValue, ret); |
Sarah Sharp | d673bfc | 2010-10-15 08:55:24 -0700 | [diff] [blame] | 5506 | mutex_unlock(hcd->bandwidth_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5507 | goto re_enumerate; |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 5508 | } |
Sarah Sharp | d673bfc | 2010-10-15 08:55:24 -0700 | [diff] [blame] | 5509 | mutex_unlock(hcd->bandwidth_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5510 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
| 5511 | |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 5512 | /* Put interfaces back into the same altsettings as before. |
| 5513 | * Don't bother to send the Set-Interface request for interfaces |
| 5514 | * that were already in altsetting 0; besides being unnecessary, |
| 5515 | * many devices can't handle it. Instead just reset the host-side |
| 5516 | * endpoint state. |
| 5517 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5518 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5519 | struct usb_host_config *config = udev->actconfig; |
| 5520 | struct usb_interface *intf = config->interface[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5521 | struct usb_interface_descriptor *desc; |
| 5522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5523 | desc = &intf->cur_altsetting->desc; |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 5524 | if (desc->bAlternateSetting == 0) { |
| 5525 | usb_disable_interface(udev, intf, true); |
| 5526 | usb_enable_interface(udev, intf, true); |
| 5527 | ret = 0; |
| 5528 | } else { |
Sarah Sharp | 04a723e | 2010-01-06 10:16:51 -0800 | [diff] [blame] | 5529 | /* Let the bandwidth allocation function know that this |
| 5530 | * device has been reset, and it will have to use |
| 5531 | * alternate setting 0 as the current alternate setting. |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 5532 | */ |
Sarah Sharp | 04a723e | 2010-01-06 10:16:51 -0800 | [diff] [blame] | 5533 | intf->resetting_device = 1; |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 5534 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
| 5535 | desc->bAlternateSetting); |
Sarah Sharp | 04a723e | 2010-01-06 10:16:51 -0800 | [diff] [blame] | 5536 | intf->resetting_device = 0; |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 5537 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5538 | if (ret < 0) { |
| 5539 | dev_err(&udev->dev, "failed to restore interface %d " |
| 5540 | "altsetting %d (error=%d)\n", |
| 5541 | desc->bInterfaceNumber, |
| 5542 | desc->bAlternateSetting, |
| 5543 | ret); |
| 5544 | goto re_enumerate; |
| 5545 | } |
Hans de Goede | 7a7b562 | 2013-11-08 16:37:26 +0100 | [diff] [blame] | 5546 | /* Resetting also frees any allocated streams */ |
| 5547 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) |
| 5548 | intf->cur_altsetting->endpoint[j].streams = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5549 | } |
| 5550 | |
| 5551 | done: |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 5552 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
Sarah Sharp | de68bab | 2013-09-30 17:26:28 +0300 | [diff] [blame] | 5553 | usb_set_usb2_hardware_lpm(udev, 1); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5554 | usb_unlocked_enable_lpm(udev); |
Sarah Sharp | f74631e | 2012-06-25 12:08:08 -0700 | [diff] [blame] | 5555 | usb_enable_ltm(udev); |
Greg Kroah-Hartman | e5bdfd5 | 2016-02-20 14:19:34 -0800 | [diff] [blame] | 5556 | usb_release_bos_descriptor(udev); |
| 5557 | udev->bos = bos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5558 | return 0; |
Matthias Beyer | 469271f | 2013-10-10 23:41:27 +0200 | [diff] [blame] | 5559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5560 | re_enumerate: |
Xenia Ragiadakou | e3376d6 | 2013-08-29 21:45:48 +0300 | [diff] [blame] | 5561 | usb_release_bos_descriptor(udev); |
| 5562 | udev->bos = bos; |
Hans Yang | 464ad8c | 2015-12-01 16:54:59 +0800 | [diff] [blame] | 5563 | re_enumerate_no_bos: |
| 5564 | /* LPM state doesn't matter when we're about to destroy the device. */ |
| 5565 | hub_port_logical_disconnect(parent_hub, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5566 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5567 | } |
| 5568 | |
| 5569 | /** |
| 5570 | * usb_reset_device - warn interface drivers and perform a USB port reset |
| 5571 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 5572 | * |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5573 | * Warns all drivers bound to registered interfaces (using their pre_reset |
| 5574 | * method), performs the port reset, and then lets the drivers know that |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5575 | * the reset is over (using their post_reset method). |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5576 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5577 | * Return: The same as for usb_reset_and_verify_device(). |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5578 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5579 | * Note: |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5580 | * The caller must own the device lock. For example, it's safe to use |
| 5581 | * this from a driver probe() routine after downloading new firmware. |
| 5582 | * For calls that might not occur during probe(), drivers should lock |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5583 | * the device using usb_lock_device_for_reset(). |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5584 | * |
| 5585 | * If an interface is currently being probed or disconnected, we assume |
| 5586 | * its driver knows how to handle resets. For all other interfaces, |
| 5587 | * if the driver doesn't have pre_reset and post_reset methods then |
| 5588 | * we attempt to unbind it and rebind afterward. |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5589 | */ |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5590 | int usb_reset_device(struct usb_device *udev) |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5591 | { |
| 5592 | int ret; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 5593 | int i; |
Ming Lei | 4d769de | 2013-02-22 16:34:22 -0800 | [diff] [blame] | 5594 | unsigned int noio_flag; |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5595 | struct usb_port *port_dev; |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5596 | struct usb_host_config *config = udev->actconfig; |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5597 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5598 | |
| 5599 | if (udev->state == USB_STATE_NOTATTACHED || |
| 5600 | udev->state == USB_STATE_SUSPENDED) { |
| 5601 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 5602 | udev->state); |
| 5603 | return -EINVAL; |
| 5604 | } |
| 5605 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5606 | if (!udev->parent) { |
| 5607 | /* this requires hcd-specific logic; see ohci_restart() */ |
| 5608 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
| 5609 | return -EISDIR; |
| 5610 | } |
| 5611 | |
| 5612 | port_dev = hub->ports[udev->portnum - 1]; |
| 5613 | |
Ming Lei | 4d769de | 2013-02-22 16:34:22 -0800 | [diff] [blame] | 5614 | /* |
| 5615 | * Don't allocate memory with GFP_KERNEL in current |
| 5616 | * context to avoid possible deadlock if usb mass |
| 5617 | * storage interface or usbnet interface(iSCSI case) |
| 5618 | * is included in current configuration. The easist |
| 5619 | * approach is to do it for every device reset, |
| 5620 | * because the device 'memalloc_noio' flag may have |
| 5621 | * not been set before reseting the usb device. |
| 5622 | */ |
| 5623 | noio_flag = memalloc_noio_save(); |
| 5624 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 5625 | /* Prevent autosuspend during the reset */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 5626 | usb_autoresume_device(udev); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 5627 | |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5628 | if (config) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5629 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 5630 | struct usb_interface *cintf = config->interface[i]; |
| 5631 | struct usb_driver *drv; |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5632 | int unbind = 0; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 5633 | |
| 5634 | if (cintf->dev.driver) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5635 | drv = to_usb_driver(cintf->dev.driver); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5636 | if (drv->pre_reset && drv->post_reset) |
| 5637 | unbind = (drv->pre_reset)(cintf); |
| 5638 | else if (cintf->condition == |
| 5639 | USB_INTERFACE_BOUND) |
| 5640 | unbind = 1; |
| 5641 | if (unbind) |
| 5642 | usb_forced_unbind_intf(cintf); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5643 | } |
| 5644 | } |
| 5645 | } |
| 5646 | |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5647 | usb_lock_port(port_dev); |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5648 | ret = usb_reset_and_verify_device(udev); |
Dan Williams | 5c79a1e | 2014-05-20 18:09:26 -0700 | [diff] [blame] | 5649 | usb_unlock_port(port_dev); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5650 | |
| 5651 | if (config) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5652 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 5653 | struct usb_interface *cintf = config->interface[i]; |
| 5654 | struct usb_driver *drv; |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5655 | int rebind = cintf->needs_binding; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 5656 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5657 | if (!rebind && cintf->dev.driver) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5658 | drv = to_usb_driver(cintf->dev.driver); |
| 5659 | if (drv->post_reset) |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 5660 | rebind = (drv->post_reset)(cintf); |
| 5661 | else if (cintf->condition == |
| 5662 | USB_INTERFACE_BOUND) |
| 5663 | rebind = 1; |
Alan Stern | 6aec044 | 2014-03-12 11:30:38 -0400 | [diff] [blame] | 5664 | if (rebind) |
| 5665 | cintf->needs_binding = 1; |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5666 | } |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5667 | } |
Alan Stern | 6aec044 | 2014-03-12 11:30:38 -0400 | [diff] [blame] | 5668 | usb_unbind_and_rebind_marked_interfaces(udev); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5669 | } |
| 5670 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 5671 | usb_autosuspend_device(udev); |
Ming Lei | 4d769de | 2013-02-22 16:34:22 -0800 | [diff] [blame] | 5672 | memalloc_noio_restore(noio_flag); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 5673 | return ret; |
| 5674 | } |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 5675 | EXPORT_SYMBOL_GPL(usb_reset_device); |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 5676 | |
| 5677 | |
| 5678 | /** |
| 5679 | * usb_queue_reset_device - Reset a USB device from an atomic context |
| 5680 | * @iface: USB interface belonging to the device to reset |
| 5681 | * |
| 5682 | * This function can be used to reset a USB device from an atomic |
| 5683 | * context, where usb_reset_device() won't work (as it blocks). |
| 5684 | * |
| 5685 | * Doing a reset via this method is functionally equivalent to calling |
| 5686 | * usb_reset_device(), except for the fact that it is delayed to a |
| 5687 | * workqueue. This means that any drivers bound to other interfaces |
| 5688 | * might be unbound, as well as users from usbfs in user space. |
| 5689 | * |
| 5690 | * Corner cases: |
| 5691 | * |
| 5692 | * - Scheduling two resets at the same time from two different drivers |
| 5693 | * attached to two different interfaces of the same device is |
| 5694 | * possible; depending on how the driver attached to each interface |
| 5695 | * handles ->pre_reset(), the second reset might happen or not. |
| 5696 | * |
Alan Stern | 524134d | 2015-01-21 14:02:43 -0500 | [diff] [blame] | 5697 | * - If the reset is delayed so long that the interface is unbound from |
| 5698 | * its driver, the reset will be skipped. |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 5699 | * |
Alan Stern | 524134d | 2015-01-21 14:02:43 -0500 | [diff] [blame] | 5700 | * - This function can be called during .probe(). It can also be called |
| 5701 | * during .disconnect(), but doing so is pointless because the reset |
| 5702 | * will not occur. If you really want to reset the device during |
| 5703 | * .disconnect(), call usb_reset_device() directly -- but watch out |
| 5704 | * for nested unbinding issues! |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 5705 | */ |
| 5706 | void usb_queue_reset_device(struct usb_interface *iface) |
| 5707 | { |
Alan Stern | 524134d | 2015-01-21 14:02:43 -0500 | [diff] [blame] | 5708 | if (schedule_work(&iface->reset_ws)) |
| 5709 | usb_get_intf(iface); |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 5710 | } |
| 5711 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 5712 | |
| 5713 | /** |
| 5714 | * usb_hub_find_child - Get the pointer of child device |
| 5715 | * attached to the port which is specified by @port1. |
| 5716 | * @hdev: USB device belonging to the usb hub |
| 5717 | * @port1: port num to indicate which port the child device |
| 5718 | * is attached to. |
| 5719 | * |
| 5720 | * USB drivers call this function to get hub's child device |
| 5721 | * pointer. |
| 5722 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5723 | * Return: %NULL if input param is invalid and |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 5724 | * child's usb_device pointer if non-NULL. |
| 5725 | */ |
| 5726 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, |
| 5727 | int port1) |
| 5728 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 5729 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Lan Tianyu | ff823c7 | 2012-09-05 13:44:32 +0800 | [diff] [blame] | 5730 | |
| 5731 | if (port1 < 1 || port1 > hdev->maxchild) |
| 5732 | return NULL; |
| 5733 | return hub->ports[port1 - 1]->child; |
| 5734 | } |
| 5735 | EXPORT_SYMBOL_GPL(usb_hub_find_child); |
Lan Tianyu | d557542 | 2012-09-05 13:44:33 +0800 | [diff] [blame] | 5736 | |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5737 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
| 5738 | struct usb_hub_descriptor *desc) |
| 5739 | { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5740 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5741 | enum usb_port_connect_type connect_type; |
| 5742 | int i; |
| 5743 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5744 | if (!hub) |
| 5745 | return; |
| 5746 | |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5747 | if (!hub_is_superspeed(hdev)) { |
| 5748 | for (i = 1; i <= hdev->maxchild; i++) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5749 | struct usb_port *port_dev = hub->ports[i - 1]; |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5750 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5751 | connect_type = port_dev->connect_type; |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5752 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| 5753 | u8 mask = 1 << (i%8); |
| 5754 | |
| 5755 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5756 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5757 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
| 5758 | } |
| 5759 | } |
| 5760 | } |
| 5761 | } else { |
| 5762 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); |
| 5763 | |
| 5764 | for (i = 1; i <= hdev->maxchild; i++) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5765 | struct usb_port *port_dev = hub->ports[i - 1]; |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5766 | |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5767 | connect_type = port_dev->connect_type; |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5768 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
| 5769 | u16 mask = 1 << i; |
| 5770 | |
| 5771 | if (!(port_removable & mask)) { |
Dan Williams | d99f6b4 | 2014-05-20 18:08:17 -0700 | [diff] [blame] | 5772 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
Lan Tianyu | d2123fd | 2013-01-21 22:18:00 +0800 | [diff] [blame] | 5773 | port_removable |= mask; |
| 5774 | } |
| 5775 | } |
| 5776 | } |
| 5777 | |
| 5778 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); |
| 5779 | } |
| 5780 | } |
| 5781 | |
Lan Tianyu | d557542 | 2012-09-05 13:44:33 +0800 | [diff] [blame] | 5782 | #ifdef CONFIG_ACPI |
| 5783 | /** |
| 5784 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle |
| 5785 | * @hdev: USB device belonging to the usb hub |
| 5786 | * @port1: port num of the port |
| 5787 | * |
Yacine Belkadi | 626f090 | 2013-08-02 20:10:04 +0200 | [diff] [blame] | 5788 | * Return: Port's acpi handle if successful, %NULL if params are |
| 5789 | * invalid. |
Lan Tianyu | d557542 | 2012-09-05 13:44:33 +0800 | [diff] [blame] | 5790 | */ |
| 5791 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, |
| 5792 | int port1) |
| 5793 | { |
Lan Tianyu | ad493e5 | 2013-01-23 04:26:30 +0800 | [diff] [blame] | 5794 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
Lan Tianyu | d557542 | 2012-09-05 13:44:33 +0800 | [diff] [blame] | 5795 | |
Mathias Nyman | 4134126 | 2013-06-18 17:28:48 +0300 | [diff] [blame] | 5796 | if (!hub) |
| 5797 | return NULL; |
| 5798 | |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame] | 5799 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
Lan Tianyu | d557542 | 2012-09-05 13:44:33 +0800 | [diff] [blame] | 5800 | } |
| 5801 | #endif |