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> |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 22 | #include <linux/kthread.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 24 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/byteorder.h> |
| 28 | |
| 29 | #include "usb.h" |
| 30 | #include "hcd.h" |
| 31 | #include "hub.h" |
| 32 | |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 33 | /* if we are in debug mode, always announce new devices */ |
| 34 | #ifdef DEBUG |
| 35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| 36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES |
| 37 | #endif |
| 38 | #endif |
| 39 | |
Alan Stern | 1bb5f66 | 2006-11-06 11:56:13 -0500 | [diff] [blame] | 40 | struct usb_hub { |
| 41 | struct device *intfdev; /* the "interface" device */ |
| 42 | struct usb_device *hdev; |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 43 | struct kref kref; |
Alan Stern | 1bb5f66 | 2006-11-06 11:56:13 -0500 | [diff] [blame] | 44 | struct urb *urb; /* for interrupt polling pipe */ |
| 45 | |
| 46 | /* buffer for urb ... with extra space in case of babble */ |
| 47 | char (*buffer)[8]; |
| 48 | dma_addr_t buffer_dma; /* DMA address for buffer */ |
| 49 | union { |
| 50 | struct usb_hub_status hub; |
| 51 | struct usb_port_status port; |
| 52 | } *status; /* buffer for status reports */ |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 53 | struct mutex status_mutex; /* for the status buffer */ |
Alan Stern | 1bb5f66 | 2006-11-06 11:56:13 -0500 | [diff] [blame] | 54 | |
| 55 | int error; /* last reported error */ |
| 56 | int nerrors; /* track consecutive errors */ |
| 57 | |
| 58 | struct list_head event_list; /* hubs w/data or errs ready */ |
| 59 | unsigned long event_bits[1]; /* status change bitmask */ |
| 60 | unsigned long change_bits[1]; /* ports with logical connect |
| 61 | status change */ |
| 62 | unsigned long busy_bits[1]; /* ports being reset or |
| 63 | resumed */ |
| 64 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ |
| 65 | #error event_bits[] is too short! |
| 66 | #endif |
| 67 | |
| 68 | struct usb_hub_descriptor *descriptor; /* class descriptor */ |
| 69 | struct usb_tt tt; /* Transaction Translator */ |
| 70 | |
| 71 | unsigned mA_per_port; /* current for each child */ |
| 72 | |
| 73 | unsigned limited_power:1; |
| 74 | unsigned quiescing:1; |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 75 | unsigned disconnected:1; |
Alan Stern | 1bb5f66 | 2006-11-06 11:56:13 -0500 | [diff] [blame] | 76 | |
| 77 | unsigned has_indicators:1; |
| 78 | u8 indicator[USB_MAXCHILDREN]; |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 79 | struct delayed_work leds; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 80 | struct delayed_work init_work; |
Alan Stern | 1bb5f66 | 2006-11-06 11:56:13 -0500 | [diff] [blame] | 81 | }; |
| 82 | |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | /* Protect struct usb_device->state and ->children members |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 85 | * Note: Both are also protected by ->dev.sem, except that ->state can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
| 87 | static DEFINE_SPINLOCK(device_state_lock); |
| 88 | |
| 89 | /* khubd's worklist and its lock */ |
| 90 | static DEFINE_SPINLOCK(hub_event_lock); |
| 91 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ |
| 92 | |
| 93 | /* Wakes up khubd */ |
| 94 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); |
| 95 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 96 | static struct task_struct *khubd_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | /* cycle leds on hubs that aren't blinking for attention */ |
| 99 | static int blinkenlights = 0; |
| 100 | module_param (blinkenlights, bool, S_IRUGO); |
| 101 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); |
| 102 | |
| 103 | /* |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 104 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about |
| 105 | * 10 seconds to send reply for the initial 64-byte descriptor request. |
| 106 | */ |
| 107 | /* define initial 64-byte descriptor request timeout in milliseconds */ |
| 108 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; |
| 109 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 110 | MODULE_PARM_DESC(initial_descriptor_timeout, |
| 111 | "initial 64-byte descriptor request timeout in milliseconds " |
| 112 | "(default 5000 - 5.0 seconds)"); |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 113 | |
| 114 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | * As of 2.6.10 we introduce a new USB device initialization scheme which |
| 116 | * closely resembles the way Windows works. Hopefully it will be compatible |
| 117 | * with a wider range of devices than the old scheme. However some previously |
| 118 | * working devices may start giving rise to "device not accepting address" |
| 119 | * errors; if that happens the user can try the old scheme by adjusting the |
| 120 | * following module parameters. |
| 121 | * |
| 122 | * For maximum flexibility there are two boolean parameters to control the |
| 123 | * hub driver's behavior. On the first initialization attempt, if the |
| 124 | * "old_scheme_first" parameter is set then the old scheme will be used, |
| 125 | * otherwise the new scheme is used. If that fails and "use_both_schemes" |
| 126 | * is set, then the driver will make another attempt, using the other scheme. |
| 127 | */ |
| 128 | static int old_scheme_first = 0; |
| 129 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
| 130 | MODULE_PARM_DESC(old_scheme_first, |
| 131 | "start with the old device initialization scheme"); |
| 132 | |
| 133 | static int use_both_schemes = 1; |
| 134 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
| 135 | MODULE_PARM_DESC(use_both_schemes, |
| 136 | "try the other device initialization scheme if the " |
| 137 | "first one fails"); |
| 138 | |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 139 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
| 140 | * port reset on some companion controllers. |
| 141 | */ |
| 142 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); |
| 143 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); |
| 144 | |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 145 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
| 146 | #define HUB_DEBOUNCE_STEP 25 |
| 147 | #define HUB_DEBOUNCE_STABLE 100 |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 150 | static int usb_reset_and_verify_device(struct usb_device *udev); |
| 151 | |
Dan Williams | 404d5b1 | 2007-04-26 00:12:10 -0700 | [diff] [blame] | 152 | static inline char *portspeed(int portstatus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) |
| 155 | return "480 Mb/s"; |
| 156 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) |
| 157 | return "1.5 Mb/s"; |
Sarah Sharp | d2e9b4d | 2009-04-27 19:55:01 -0700 | [diff] [blame] | 158 | else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) |
| 159 | return "5.0 Gb/s"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | else |
| 161 | return "12 Mb/s"; |
| 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | /* Note that hdev or one of its children must be locked! */ |
| 165 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
| 166 | { |
| 167 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
| 168 | } |
| 169 | |
| 170 | /* USB 2.0 spec Section 11.24.4.5 */ |
| 171 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) |
| 172 | { |
| 173 | int i, ret; |
| 174 | |
| 175 | for (i = 0; i < 3; i++) { |
| 176 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 177 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
| 178 | USB_DT_HUB << 8, 0, data, size, |
| 179 | USB_CTRL_GET_TIMEOUT); |
| 180 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) |
| 181 | return ret; |
| 182 | } |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * USB 2.0 spec Section 11.24.2.1 |
| 188 | */ |
| 189 | static int clear_hub_feature(struct usb_device *hdev, int feature) |
| 190 | { |
| 191 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 192 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * USB 2.0 spec Section 11.24.2.2 |
| 197 | */ |
| 198 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) |
| 199 | { |
| 200 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 201 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
| 202 | NULL, 0, 1000); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * USB 2.0 spec Section 11.24.2.13 |
| 207 | */ |
| 208 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
| 209 | { |
| 210 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 211 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
| 212 | NULL, 0, 1000); |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
| 217 | * for info about using port indicators |
| 218 | */ |
| 219 | static void set_port_led( |
| 220 | struct usb_hub *hub, |
| 221 | int port1, |
| 222 | int selector |
| 223 | ) |
| 224 | { |
| 225 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, |
| 226 | USB_PORT_FEAT_INDICATOR); |
| 227 | if (status < 0) |
| 228 | dev_dbg (hub->intfdev, |
| 229 | "port %d indicator %s status %d\n", |
| 230 | port1, |
| 231 | ({ char *s; switch (selector) { |
| 232 | case HUB_LED_AMBER: s = "amber"; break; |
| 233 | case HUB_LED_GREEN: s = "green"; break; |
| 234 | case HUB_LED_OFF: s = "off"; break; |
| 235 | case HUB_LED_AUTO: s = "auto"; break; |
| 236 | default: s = "??"; break; |
| 237 | }; s; }), |
| 238 | status); |
| 239 | } |
| 240 | |
| 241 | #define LED_CYCLE_PERIOD ((2*HZ)/3) |
| 242 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 243 | static void led_work (struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 245 | struct usb_hub *hub = |
| 246 | container_of(work, struct usb_hub, leds.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | struct usb_device *hdev = hub->hdev; |
| 248 | unsigned i; |
| 249 | unsigned changed = 0; |
| 250 | int cursor = -1; |
| 251 | |
| 252 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
| 253 | return; |
| 254 | |
| 255 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { |
| 256 | unsigned selector, mode; |
| 257 | |
| 258 | /* 30%-50% duty cycle */ |
| 259 | |
| 260 | switch (hub->indicator[i]) { |
| 261 | /* cycle marker */ |
| 262 | case INDICATOR_CYCLE: |
| 263 | cursor = i; |
| 264 | selector = HUB_LED_AUTO; |
| 265 | mode = INDICATOR_AUTO; |
| 266 | break; |
| 267 | /* blinking green = sw attention */ |
| 268 | case INDICATOR_GREEN_BLINK: |
| 269 | selector = HUB_LED_GREEN; |
| 270 | mode = INDICATOR_GREEN_BLINK_OFF; |
| 271 | break; |
| 272 | case INDICATOR_GREEN_BLINK_OFF: |
| 273 | selector = HUB_LED_OFF; |
| 274 | mode = INDICATOR_GREEN_BLINK; |
| 275 | break; |
| 276 | /* blinking amber = hw attention */ |
| 277 | case INDICATOR_AMBER_BLINK: |
| 278 | selector = HUB_LED_AMBER; |
| 279 | mode = INDICATOR_AMBER_BLINK_OFF; |
| 280 | break; |
| 281 | case INDICATOR_AMBER_BLINK_OFF: |
| 282 | selector = HUB_LED_OFF; |
| 283 | mode = INDICATOR_AMBER_BLINK; |
| 284 | break; |
| 285 | /* blink green/amber = reserved */ |
| 286 | case INDICATOR_ALT_BLINK: |
| 287 | selector = HUB_LED_GREEN; |
| 288 | mode = INDICATOR_ALT_BLINK_OFF; |
| 289 | break; |
| 290 | case INDICATOR_ALT_BLINK_OFF: |
| 291 | selector = HUB_LED_AMBER; |
| 292 | mode = INDICATOR_ALT_BLINK; |
| 293 | break; |
| 294 | default: |
| 295 | continue; |
| 296 | } |
| 297 | if (selector != HUB_LED_AUTO) |
| 298 | changed = 1; |
| 299 | set_port_led(hub, i + 1, selector); |
| 300 | hub->indicator[i] = mode; |
| 301 | } |
| 302 | if (!changed && blinkenlights) { |
| 303 | cursor++; |
| 304 | cursor %= hub->descriptor->bNbrPorts; |
| 305 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
| 306 | hub->indicator[cursor] = INDICATOR_CYCLE; |
| 307 | changed++; |
| 308 | } |
| 309 | if (changed) |
| 310 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 311 | } |
| 312 | |
| 313 | /* use a short timeout for hub/port status fetches */ |
| 314 | #define USB_STS_TIMEOUT 1000 |
| 315 | #define USB_STS_RETRIES 5 |
| 316 | |
| 317 | /* |
| 318 | * USB 2.0 spec Section 11.24.2.6 |
| 319 | */ |
| 320 | static int get_hub_status(struct usb_device *hdev, |
| 321 | struct usb_hub_status *data) |
| 322 | { |
| 323 | int i, status = -ETIMEDOUT; |
| 324 | |
| 325 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 326 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 327 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
| 328 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 329 | } |
| 330 | return status; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * USB 2.0 spec Section 11.24.2.7 |
| 335 | */ |
| 336 | static int get_port_status(struct usb_device *hdev, int port1, |
| 337 | struct usb_port_status *data) |
| 338 | { |
| 339 | int i, status = -ETIMEDOUT; |
| 340 | |
| 341 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 342 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 343 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, |
| 344 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 345 | } |
| 346 | return status; |
| 347 | } |
| 348 | |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 349 | static int hub_port_status(struct usb_hub *hub, int port1, |
| 350 | u16 *status, u16 *change) |
| 351 | { |
| 352 | int ret; |
| 353 | |
| 354 | mutex_lock(&hub->status_mutex); |
| 355 | ret = get_port_status(hub->hdev, port1, &hub->status->port); |
| 356 | if (ret < 4) { |
| 357 | dev_err(hub->intfdev, |
| 358 | "%s failed (err = %d)\n", __func__, ret); |
| 359 | if (ret >= 0) |
| 360 | ret = -EIO; |
| 361 | } else { |
| 362 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
| 363 | *change = le16_to_cpu(hub->status->port.wPortChange); |
| 364 | ret = 0; |
| 365 | } |
| 366 | mutex_unlock(&hub->status_mutex); |
| 367 | return ret; |
| 368 | } |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | static void kick_khubd(struct usb_hub *hub) |
| 371 | { |
| 372 | unsigned long flags; |
| 373 | |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 374 | /* Suppress autosuspend until khubd runs */ |
| 375 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | spin_lock_irqsave(&hub_event_lock, flags); |
Roel Kluin | 2e2c5ee | 2007-10-26 23:54:35 +0200 | [diff] [blame] | 378 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | list_add_tail(&hub->event_list, &hub_event_list); |
| 380 | wake_up(&khubd_wait); |
| 381 | } |
| 382 | spin_unlock_irqrestore(&hub_event_lock, flags); |
| 383 | } |
| 384 | |
| 385 | void usb_kick_khubd(struct usb_device *hdev) |
| 386 | { |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 387 | /* FIXME: What if hdev isn't bound to the hub driver? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | kick_khubd(hdev_to_hub(hdev)); |
| 389 | } |
| 390 | |
| 391 | |
| 392 | /* completion function, fires on port status changes and various faults */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 393 | static void hub_irq(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
Tobias Klauser | ec17cf1 | 2006-09-13 21:38:41 +0200 | [diff] [blame] | 395 | struct usb_hub *hub = urb->context; |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 396 | int status = urb->status; |
Roel Kluin | 71d2718 | 2009-03-13 12:19:18 +0100 | [diff] [blame] | 397 | unsigned i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | unsigned long bits; |
| 399 | |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 400 | switch (status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | case -ENOENT: /* synchronous unlink */ |
| 402 | case -ECONNRESET: /* async unlink */ |
| 403 | case -ESHUTDOWN: /* hardware going away */ |
| 404 | return; |
| 405 | |
| 406 | default: /* presumably an error */ |
| 407 | /* Cause a hub reset after 10 consecutive errors */ |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 408 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if ((++hub->nerrors < 10) || hub->error) |
| 410 | goto resubmit; |
Alan Stern | e015268 | 2007-08-24 15:42:52 -0400 | [diff] [blame] | 411 | hub->error = status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | /* FALL THROUGH */ |
Tobias Klauser | ec17cf1 | 2006-09-13 21:38:41 +0200 | [diff] [blame] | 413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | /* let khubd handle things */ |
| 415 | case 0: /* we got data: port status changed */ |
| 416 | bits = 0; |
| 417 | for (i = 0; i < urb->actual_length; ++i) |
| 418 | bits |= ((unsigned long) ((*hub->buffer)[i])) |
| 419 | << (i*8); |
| 420 | hub->event_bits[0] = bits; |
| 421 | break; |
| 422 | } |
| 423 | |
| 424 | hub->nerrors = 0; |
| 425 | |
| 426 | /* Something happened, let khubd figure it out */ |
| 427 | kick_khubd(hub); |
| 428 | |
| 429 | resubmit: |
| 430 | if (hub->quiescing) |
| 431 | return; |
| 432 | |
| 433 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 |
| 434 | && status != -ENODEV && status != -EPERM) |
| 435 | dev_err (hub->intfdev, "resubmit --> %d\n", status); |
| 436 | } |
| 437 | |
| 438 | /* USB 2.0 spec Section 11.24.2.3 */ |
| 439 | static inline int |
| 440 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) |
| 441 | { |
| 442 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 443 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
| 444 | tt, NULL, 0, 1000); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * enumeration blocks khubd for a long time. we use keventd instead, since |
| 449 | * long blocking there is the exception, not the rule. accordingly, HCDs |
| 450 | * talking to TTs must queue control transfers (not just bulk and iso), so |
| 451 | * both can talk to the same hub concurrently. |
| 452 | */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 453 | static void hub_tt_kevent (struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 455 | struct usb_hub *hub = |
| 456 | container_of(work, struct usb_hub, tt.kevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | unsigned long flags; |
Mark Lord | 55e5fdf | 2007-05-14 19:48:02 -0400 | [diff] [blame] | 458 | int limit = 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | spin_lock_irqsave (&hub->tt.lock, flags); |
Mark Lord | 55e5fdf | 2007-05-14 19:48:02 -0400 | [diff] [blame] | 461 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
H Hartley Sweeten | d0f830d | 2009-04-22 16:03:05 -0400 | [diff] [blame] | 462 | struct list_head *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | struct usb_tt_clear *clear; |
| 464 | struct usb_device *hdev = hub->hdev; |
| 465 | int status; |
| 466 | |
H Hartley Sweeten | d0f830d | 2009-04-22 16:03:05 -0400 | [diff] [blame] | 467 | next = hub->tt.clear_list.next; |
| 468 | clear = list_entry (next, struct usb_tt_clear, clear_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | list_del (&clear->clear_list); |
| 470 | |
| 471 | /* drop lock so HCD can concurrently report other TT errors */ |
| 472 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 473 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); |
| 474 | spin_lock_irqsave (&hub->tt.lock, flags); |
| 475 | |
| 476 | if (status) |
| 477 | dev_err (&hdev->dev, |
| 478 | "clear tt %d (%04x) error %d\n", |
| 479 | clear->tt, clear->devinfo, status); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 480 | kfree(clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub |
| 487 | * @udev: the device whose split transaction failed |
| 488 | * @pipe: identifies the endpoint of the failed transaction |
| 489 | * |
| 490 | * High speed HCDs use this to tell the hub driver that some split control or |
| 491 | * bulk transaction failed in a way that requires clearing internal state of |
| 492 | * a transaction translator. This is normally detected (and reported) from |
| 493 | * interrupt context. |
| 494 | * |
| 495 | * It may not be possible for that hub to handle additional full (or low) |
| 496 | * speed transactions until that state is fully cleared out. |
| 497 | */ |
| 498 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) |
| 499 | { |
| 500 | struct usb_tt *tt = udev->tt; |
| 501 | unsigned long flags; |
| 502 | struct usb_tt_clear *clear; |
| 503 | |
| 504 | /* we've got to cope with an arbitrary number of pending TT clears, |
| 505 | * since each TT has "at least two" buffers that can need it (and |
| 506 | * there can be many TTs per hub). even if they're uncommon. |
| 507 | */ |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 508 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
| 510 | /* FIXME recover somehow ... RESET_TT? */ |
| 511 | return; |
| 512 | } |
| 513 | |
| 514 | /* info that CLEAR_TT_BUFFER needs */ |
| 515 | clear->tt = tt->multi ? udev->ttport : 1; |
| 516 | clear->devinfo = usb_pipeendpoint (pipe); |
| 517 | clear->devinfo |= udev->devnum << 4; |
| 518 | clear->devinfo |= usb_pipecontrol (pipe) |
| 519 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
| 520 | : (USB_ENDPOINT_XFER_BULK << 11); |
| 521 | if (usb_pipein (pipe)) |
| 522 | clear->devinfo |= 1 << 15; |
| 523 | |
| 524 | /* tell keventd to clear state for this TT */ |
| 525 | spin_lock_irqsave (&tt->lock, flags); |
| 526 | list_add_tail (&clear->clear_list, &tt->clear_list); |
| 527 | schedule_work (&tt->kevent); |
| 528 | spin_unlock_irqrestore (&tt->lock, flags); |
| 529 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 530 | EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 532 | /* If do_delay is false, return the number of milliseconds the caller |
| 533 | * needs to delay. |
| 534 | */ |
| 535 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
| 537 | int port1; |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 538 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 539 | unsigned delay; |
Alan Stern | 4489a57 | 2006-04-27 15:54:22 -0400 | [diff] [blame] | 540 | u16 wHubCharacteristics = |
| 541 | le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Alan Stern | 4489a57 | 2006-04-27 15:54:22 -0400 | [diff] [blame] | 543 | /* Enable power on each port. Some hubs have reserved values |
| 544 | * of LPSM (> 2) in their descriptors, even though they are |
| 545 | * USB 2.0 hubs. Some hubs do not implement port-power switching |
| 546 | * but only emulate it. In all cases, the ports won't work |
| 547 | * unless we send these messages to the hub. |
| 548 | */ |
| 549 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
Alan Stern | 4489a57 | 2006-04-27 15:54:22 -0400 | [diff] [blame] | 551 | else |
| 552 | dev_dbg(hub->intfdev, "trying to enable port power on " |
| 553 | "non-switchable hub\n"); |
| 554 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) |
| 555 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 557 | /* Wait at least 100 msec for power to become stable */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 558 | delay = max(pgood_delay, (unsigned) 100); |
| 559 | if (do_delay) |
| 560 | msleep(delay); |
| 561 | return delay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | } |
| 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | static int hub_hub_status(struct usb_hub *hub, |
| 565 | u16 *status, u16 *change) |
| 566 | { |
| 567 | int ret; |
| 568 | |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 569 | mutex_lock(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
| 571 | if (ret < 0) |
| 572 | dev_err (hub->intfdev, |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 573 | "%s failed (err = %d)\n", __func__, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | else { |
| 575 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
| 576 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
| 577 | ret = 0; |
| 578 | } |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 579 | mutex_unlock(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | return ret; |
| 581 | } |
| 582 | |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 583 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
| 584 | { |
| 585 | struct usb_device *hdev = hub->hdev; |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 586 | int ret = 0; |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 587 | |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 588 | if (hdev->children[port1-1] && set_state) |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 589 | usb_set_device_state(hdev->children[port1-1], |
| 590 | USB_STATE_NOTATTACHED); |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 591 | if (!hub->error) |
| 592 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 593 | if (ret) |
| 594 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 595 | port1, ret); |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 596 | return ret; |
| 597 | } |
| 598 | |
Alan Stern | 0458d5b | 2007-05-04 11:52:20 -0400 | [diff] [blame] | 599 | /* |
| 600 | * Disable a port and mark a logical connnect-change event, so that some |
| 601 | * time later khubd will disconnect() any existing usb_device on the port |
| 602 | * and will re-enumerate if there actually is a device attached. |
| 603 | */ |
| 604 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
| 605 | { |
| 606 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); |
| 607 | hub_port_disable(hub, port1, 1); |
| 608 | |
| 609 | /* FIXME let caller ask to power down the port: |
| 610 | * - some devices won't enumerate without a VBUS power cycle |
| 611 | * - SRP saves power that way |
| 612 | * - ... new call, TBD ... |
| 613 | * That's easy if this hub can switch power per-port, and |
| 614 | * khubd reactivates the port later (timer, SRP, etc). |
| 615 | * Powerdown must be optional, because of reset/DFU. |
| 616 | */ |
| 617 | |
| 618 | set_bit(port1, hub->change_bits); |
| 619 | kick_khubd(hub); |
| 620 | } |
| 621 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 622 | enum hub_activation_type { |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 623 | HUB_INIT, HUB_INIT2, HUB_INIT3, |
| 624 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 625 | }; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 626 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 627 | static void hub_init_func2(struct work_struct *ws); |
| 628 | static void hub_init_func3(struct work_struct *ws); |
| 629 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 630 | 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] | 631 | { |
| 632 | struct usb_device *hdev = hub->hdev; |
| 633 | int port1; |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 634 | int status; |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 635 | bool need_debounce_delay = false; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 636 | unsigned delay; |
| 637 | |
| 638 | /* Continue a partial initialization */ |
| 639 | if (type == HUB_INIT2) |
| 640 | goto init2; |
| 641 | if (type == HUB_INIT3) |
| 642 | goto init3; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 643 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 644 | /* After a resume, port power should still be on. |
| 645 | * For any other type of activation, turn it on. |
| 646 | */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 647 | if (type != HUB_RESUME) { |
| 648 | |
| 649 | /* Speed up system boot by using a delayed_work for the |
| 650 | * hub's initial power-up delays. This is pretty awkward |
| 651 | * and the implementation looks like a home-brewed sort of |
| 652 | * setjmp/longjmp, but it saves at least 100 ms for each |
| 653 | * root hub (assuming usbcore is compiled into the kernel |
| 654 | * rather than as a module). It adds up. |
| 655 | * |
| 656 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME |
| 657 | * because for those activation types the ports have to be |
| 658 | * operational when we return. In theory this could be done |
| 659 | * for HUB_POST_RESET, but it's easier not to. |
| 660 | */ |
| 661 | if (type == HUB_INIT) { |
| 662 | delay = hub_power_on(hub, false); |
| 663 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); |
| 664 | schedule_delayed_work(&hub->init_work, |
| 665 | msecs_to_jiffies(delay)); |
Alan Stern | 61fbeba | 2008-10-27 12:07:44 -0400 | [diff] [blame] | 666 | |
| 667 | /* Suppress autosuspend until init is done */ |
| 668 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 669 | return; /* Continues at init2: below */ |
| 670 | } else { |
| 671 | hub_power_on(hub, true); |
| 672 | } |
| 673 | } |
| 674 | init2: |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 675 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 676 | /* Check each port and set hub->change_bits to let khubd know |
| 677 | * which ports need attention. |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 678 | */ |
| 679 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 680 | struct usb_device *udev = hdev->children[port1-1]; |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 681 | u16 portstatus, portchange; |
| 682 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 683 | portstatus = portchange = 0; |
| 684 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 685 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
| 686 | dev_dbg(hub->intfdev, |
| 687 | "port %d: status %04x change %04x\n", |
| 688 | port1, portstatus, portchange); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 689 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 690 | /* After anything other than HUB_RESUME (i.e., initialization |
| 691 | * or any sort of reset), every port should be disabled. |
| 692 | * Unconnected ports should likewise be disabled (paranoia), |
| 693 | * and so should ports for which we have no usb_device. |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 694 | */ |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 695 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( |
| 696 | type != HUB_RESUME || |
| 697 | !(portstatus & USB_PORT_STAT_CONNECTION) || |
| 698 | !udev || |
| 699 | udev->state == USB_STATE_NOTATTACHED)) { |
| 700 | clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); |
| 701 | portstatus &= ~USB_PORT_STAT_ENABLE; |
| 702 | } |
| 703 | |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 704 | /* Clear status-change flags; we'll debounce later */ |
| 705 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 706 | need_debounce_delay = true; |
| 707 | clear_port_feature(hub->hdev, port1, |
| 708 | USB_PORT_FEAT_C_CONNECTION); |
| 709 | } |
| 710 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 711 | need_debounce_delay = true; |
| 712 | clear_port_feature(hub->hdev, port1, |
| 713 | USB_PORT_FEAT_C_ENABLE); |
| 714 | } |
| 715 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 716 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
| 717 | /* Tell khubd to disconnect the device or |
| 718 | * check for a new connection |
| 719 | */ |
| 720 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
| 721 | set_bit(port1, hub->change_bits); |
| 722 | |
| 723 | } else if (portstatus & USB_PORT_STAT_ENABLE) { |
| 724 | /* The power session apparently survived the resume. |
| 725 | * If there was an overcurrent or suspend change |
| 726 | * (i.e., remote wakeup request), have khubd |
| 727 | * take care of it. |
| 728 | */ |
| 729 | if (portchange) |
| 730 | set_bit(port1, hub->change_bits); |
| 731 | |
| 732 | } else if (udev->persist_enabled) { |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 733 | #ifdef CONFIG_PM |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 734 | udev->reset_resume = 1; |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 735 | #endif |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 736 | set_bit(port1, hub->change_bits); |
| 737 | |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 738 | } else { |
| 739 | /* The power session is gone; tell khubd */ |
| 740 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 741 | set_bit(port1, hub->change_bits); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 742 | } |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 743 | } |
| 744 | |
Alan Stern | 948fea3 | 2008-04-28 11:07:07 -0400 | [diff] [blame] | 745 | /* If no port-status-change flags were set, we don't need any |
| 746 | * debouncing. If flags were set we can try to debounce the |
| 747 | * ports all at once right now, instead of letting khubd do them |
| 748 | * one at a time later on. |
| 749 | * |
| 750 | * If any port-status changes do occur during this delay, khubd |
| 751 | * will see them later and handle them normally. |
| 752 | */ |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 753 | if (need_debounce_delay) { |
| 754 | delay = HUB_DEBOUNCE_STABLE; |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 755 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 756 | /* Don't do a long sleep inside a workqueue routine */ |
| 757 | if (type == HUB_INIT2) { |
| 758 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); |
| 759 | schedule_delayed_work(&hub->init_work, |
| 760 | msecs_to_jiffies(delay)); |
| 761 | return; /* Continues at init3: below */ |
| 762 | } else { |
| 763 | msleep(delay); |
| 764 | } |
| 765 | } |
| 766 | init3: |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 767 | hub->quiescing = 0; |
| 768 | |
| 769 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
| 770 | if (status < 0) |
| 771 | dev_err(hub->intfdev, "activate --> %d\n", status); |
| 772 | if (hub->has_indicators && blinkenlights) |
| 773 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 774 | |
| 775 | /* Scan all ports that need attention */ |
| 776 | kick_khubd(hub); |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 777 | } |
| 778 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 779 | /* Implement the continuations for the delays above */ |
| 780 | static void hub_init_func2(struct work_struct *ws) |
| 781 | { |
| 782 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 783 | |
| 784 | hub_activate(hub, HUB_INIT2); |
| 785 | } |
| 786 | |
| 787 | static void hub_init_func3(struct work_struct *ws) |
| 788 | { |
| 789 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
| 790 | |
| 791 | hub_activate(hub, HUB_INIT3); |
| 792 | } |
| 793 | |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 794 | enum hub_quiescing_type { |
| 795 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND |
| 796 | }; |
| 797 | |
| 798 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) |
| 799 | { |
| 800 | struct usb_device *hdev = hub->hdev; |
| 801 | int i; |
| 802 | |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 803 | cancel_delayed_work_sync(&hub->init_work); |
| 804 | |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 805 | /* khubd and related activity won't re-trigger */ |
| 806 | hub->quiescing = 1; |
| 807 | |
| 808 | if (type != HUB_SUSPEND) { |
| 809 | /* Disconnect all the children */ |
| 810 | for (i = 0; i < hdev->maxchild; ++i) { |
| 811 | if (hdev->children[i]) |
| 812 | usb_disconnect(&hdev->children[i]); |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /* Stop khubd and related activity */ |
| 817 | usb_kill_urb(hub->urb); |
| 818 | if (hub->has_indicators) |
| 819 | cancel_delayed_work_sync(&hub->leds); |
| 820 | if (hub->tt.hub) |
| 821 | cancel_work_sync(&hub->tt.kevent); |
| 822 | } |
| 823 | |
Alan Stern | 3eb1491 | 2008-03-03 15:15:43 -0500 | [diff] [blame] | 824 | /* caller has locked the hub device */ |
| 825 | static int hub_pre_reset(struct usb_interface *intf) |
| 826 | { |
| 827 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 828 | |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 829 | hub_quiesce(hub, HUB_PRE_RESET); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 830 | return 0; |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | /* caller has locked the hub device */ |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 834 | static int hub_post_reset(struct usb_interface *intf) |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 835 | { |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 836 | struct usb_hub *hub = usb_get_intfdata(intf); |
| 837 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 838 | hub_activate(hub, HUB_POST_RESET); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 839 | return 0; |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 840 | } |
| 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | static int hub_configure(struct usb_hub *hub, |
| 843 | struct usb_endpoint_descriptor *endpoint) |
| 844 | { |
| 845 | struct usb_device *hdev = hub->hdev; |
| 846 | struct device *hub_dev = hub->intfdev; |
| 847 | u16 hubstatus, hubchange; |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 848 | u16 wHubCharacteristics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | unsigned int pipe; |
| 850 | int maxp, ret; |
| 851 | char *message; |
| 852 | |
| 853 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, |
| 854 | &hub->buffer_dma); |
| 855 | if (!hub->buffer) { |
| 856 | message = "can't allocate hub irq buffer"; |
| 857 | ret = -ENOMEM; |
| 858 | goto fail; |
| 859 | } |
| 860 | |
| 861 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
| 862 | if (!hub->status) { |
| 863 | message = "can't kmalloc hub status buffer"; |
| 864 | ret = -ENOMEM; |
| 865 | goto fail; |
| 866 | } |
Alan Stern | db90e7a | 2007-02-05 09:56:15 -0500 | [diff] [blame] | 867 | mutex_init(&hub->status_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
| 870 | if (!hub->descriptor) { |
| 871 | message = "can't kmalloc hub descriptor"; |
| 872 | ret = -ENOMEM; |
| 873 | goto fail; |
| 874 | } |
| 875 | |
| 876 | /* Request the entire hub descriptor. |
| 877 | * hub->descriptor can handle USB_MAXCHILDREN ports, |
| 878 | * but the hub can/will return fewer bytes here. |
| 879 | */ |
| 880 | ret = get_hub_descriptor(hdev, hub->descriptor, |
| 881 | sizeof(*hub->descriptor)); |
| 882 | if (ret < 0) { |
| 883 | message = "can't read hub descriptor"; |
| 884 | goto fail; |
| 885 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { |
| 886 | message = "hub has too many ports!"; |
| 887 | ret = -ENODEV; |
| 888 | goto fail; |
| 889 | } |
| 890 | |
| 891 | hdev->maxchild = hub->descriptor->bNbrPorts; |
| 892 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, |
| 893 | (hdev->maxchild == 1) ? "" : "s"); |
| 894 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 895 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 897 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | int i; |
| 899 | char portstr [USB_MAXCHILDREN + 1]; |
| 900 | |
| 901 | for (i = 0; i < hdev->maxchild; i++) |
| 902 | portstr[i] = hub->descriptor->DeviceRemovable |
| 903 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
| 904 | ? 'F' : 'R'; |
| 905 | portstr[hdev->maxchild] = 0; |
| 906 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
| 907 | } else |
| 908 | dev_dbg(hub_dev, "standalone hub\n"); |
| 909 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 910 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | case 0x00: |
| 912 | dev_dbg(hub_dev, "ganged power switching\n"); |
| 913 | break; |
| 914 | case 0x01: |
| 915 | dev_dbg(hub_dev, "individual port power switching\n"); |
| 916 | break; |
| 917 | case 0x02: |
| 918 | case 0x03: |
| 919 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
| 920 | break; |
| 921 | } |
| 922 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 923 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | case 0x00: |
| 925 | dev_dbg(hub_dev, "global over-current protection\n"); |
| 926 | break; |
| 927 | case 0x08: |
| 928 | dev_dbg(hub_dev, "individual port over-current protection\n"); |
| 929 | break; |
| 930 | case 0x10: |
| 931 | case 0x18: |
| 932 | dev_dbg(hub_dev, "no over-current protection\n"); |
| 933 | break; |
| 934 | } |
| 935 | |
| 936 | spin_lock_init (&hub->tt.lock); |
| 937 | INIT_LIST_HEAD (&hub->tt.clear_list); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 938 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | switch (hdev->descriptor.bDeviceProtocol) { |
| 940 | case 0: |
| 941 | break; |
| 942 | case 1: |
| 943 | dev_dbg(hub_dev, "Single TT\n"); |
| 944 | hub->tt.hub = hdev; |
| 945 | break; |
| 946 | case 2: |
| 947 | ret = usb_set_interface(hdev, 0, 1); |
| 948 | if (ret == 0) { |
| 949 | dev_dbg(hub_dev, "TT per port\n"); |
| 950 | hub->tt.multi = 1; |
| 951 | } else |
| 952 | dev_err(hub_dev, "Using single TT (err %d)\n", |
| 953 | ret); |
| 954 | hub->tt.hub = hdev; |
| 955 | break; |
Sarah Sharp | d2e9b4d | 2009-04-27 19:55:01 -0700 | [diff] [blame] | 956 | case 3: |
| 957 | /* USB 3.0 hubs don't have a TT */ |
| 958 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | default: |
| 960 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
| 961 | hdev->descriptor.bDeviceProtocol); |
| 962 | break; |
| 963 | } |
| 964 | |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 965 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 966 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 967 | case HUB_TTTT_8_BITS: |
| 968 | if (hdev->descriptor.bDeviceProtocol != 0) { |
| 969 | hub->tt.think_time = 666; |
| 970 | dev_dbg(hub_dev, "TT requires at most %d " |
| 971 | "FS bit times (%d ns)\n", |
| 972 | 8, hub->tt.think_time); |
| 973 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 975 | case HUB_TTTT_16_BITS: |
| 976 | hub->tt.think_time = 666 * 2; |
| 977 | dev_dbg(hub_dev, "TT requires at most %d " |
| 978 | "FS bit times (%d ns)\n", |
| 979 | 16, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 981 | case HUB_TTTT_24_BITS: |
| 982 | hub->tt.think_time = 666 * 3; |
| 983 | dev_dbg(hub_dev, "TT requires at most %d " |
| 984 | "FS bit times (%d ns)\n", |
| 985 | 24, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 987 | case HUB_TTTT_32_BITS: |
| 988 | hub->tt.think_time = 666 * 4; |
| 989 | dev_dbg(hub_dev, "TT requires at most %d " |
| 990 | "FS bit times (%d ns)\n", |
| 991 | 32, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | break; |
| 993 | } |
| 994 | |
| 995 | /* probe() zeroes hub->indicator[] */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 996 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | hub->has_indicators = 1; |
| 998 | dev_dbg(hub_dev, "Port indicators are supported\n"); |
| 999 | } |
| 1000 | |
| 1001 | dev_dbg(hub_dev, "power on to power good time: %dms\n", |
| 1002 | hub->descriptor->bPwrOn2PwrGood * 2); |
| 1003 | |
| 1004 | /* power budgeting mostly matters with bus-powered hubs, |
| 1005 | * and battery-powered root hubs (may provide just 8 mA). |
| 1006 | */ |
| 1007 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1008 | if (ret < 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | message = "can't get hub status"; |
| 1010 | goto fail; |
| 1011 | } |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 1012 | le16_to_cpus(&hubstatus); |
| 1013 | if (hdev == hdev->bus->root_hub) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1014 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
| 1015 | hub->mA_per_port = 500; |
| 1016 | else { |
| 1017 | hub->mA_per_port = hdev->bus_mA; |
| 1018 | hub->limited_power = 1; |
| 1019 | } |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 1020 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
| 1022 | hub->descriptor->bHubContrCurrent); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1023 | hub->limited_power = 1; |
| 1024 | if (hdev->maxchild > 0) { |
| 1025 | int remaining = hdev->bus_mA - |
| 1026 | hub->descriptor->bHubContrCurrent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1028 | if (remaining < hdev->maxchild * 100) |
| 1029 | dev_warn(hub_dev, |
| 1030 | "insufficient power available " |
| 1031 | "to use all downstream ports\n"); |
| 1032 | hub->mA_per_port = 100; /* 7.2.1.1 */ |
| 1033 | } |
| 1034 | } else { /* Self-powered external hub */ |
| 1035 | /* FIXME: What about battery-powered external hubs that |
| 1036 | * provide less current per port? */ |
| 1037 | hub->mA_per_port = 500; |
| 1038 | } |
| 1039 | if (hub->mA_per_port < 500) |
| 1040 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
| 1041 | hub->mA_per_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
| 1044 | if (ret < 0) { |
| 1045 | message = "can't get hub status"; |
| 1046 | goto fail; |
| 1047 | } |
| 1048 | |
| 1049 | /* local power status reports aren't always correct */ |
| 1050 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
| 1051 | dev_dbg(hub_dev, "local power source is %s\n", |
| 1052 | (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 1053 | ? "lost (inactive)" : "good"); |
| 1054 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1055 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
| 1057 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
| 1058 | |
inaky@linux.intel.com | 88fafff | 2006-10-11 20:05:59 -0700 | [diff] [blame] | 1059 | /* set up the interrupt endpoint |
| 1060 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 |
| 1061 | * bytes as USB2.0[11.12.3] says because some hubs are known |
| 1062 | * to send more data (and thus cause overflow). For root hubs, |
| 1063 | * maxpktsize is defined in hcd.c's fake endpoint descriptors |
| 1064 | * to be big enough for at least USB_MAXCHILDREN ports. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
| 1066 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
| 1067 | |
| 1068 | if (maxp > sizeof(*hub->buffer)) |
| 1069 | maxp = sizeof(*hub->buffer); |
| 1070 | |
| 1071 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
| 1072 | if (!hub->urb) { |
| 1073 | message = "couldn't allocate interrupt urb"; |
| 1074 | ret = -ENOMEM; |
| 1075 | goto fail; |
| 1076 | } |
| 1077 | |
| 1078 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
| 1079 | hub, endpoint->bInterval); |
| 1080 | hub->urb->transfer_dma = hub->buffer_dma; |
| 1081 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 1082 | |
| 1083 | /* maybe cycle the hub leds */ |
| 1084 | if (hub->has_indicators && blinkenlights) |
| 1085 | hub->indicator [0] = INDICATOR_CYCLE; |
| 1086 | |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 1087 | hub_activate(hub, HUB_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | return 0; |
| 1089 | |
| 1090 | fail: |
| 1091 | dev_err (hub_dev, "config failed, %s (err %d)\n", |
| 1092 | message, ret); |
| 1093 | /* hub_disconnect() frees urb and descriptor */ |
| 1094 | return ret; |
| 1095 | } |
| 1096 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1097 | static void hub_release(struct kref *kref) |
| 1098 | { |
| 1099 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); |
| 1100 | |
| 1101 | usb_put_intf(to_usb_interface(hub->intfdev)); |
| 1102 | kfree(hub); |
| 1103 | } |
| 1104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | static unsigned highspeed_hubs; |
| 1106 | |
| 1107 | static void hub_disconnect(struct usb_interface *intf) |
| 1108 | { |
| 1109 | struct usb_hub *hub = usb_get_intfdata (intf); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1110 | |
| 1111 | /* Take the hub off the event list and don't let it be added again */ |
| 1112 | spin_lock_irq(&hub_event_lock); |
| 1113 | list_del_init(&hub->event_list); |
| 1114 | hub->disconnected = 1; |
| 1115 | spin_unlock_irq(&hub_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 1117 | /* Disconnect all children and quiesce the hub */ |
| 1118 | hub->error = 0; |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 1119 | hub_quiesce(hub, HUB_DISCONNECT); |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 1120 | |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 1121 | usb_set_intfdata (intf, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1123 | if (hub->hdev->speed == USB_SPEED_HIGH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | highspeed_hubs--; |
| 1125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | usb_free_urb(hub->urb); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 1127 | kfree(hub->descriptor); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 1128 | kfree(hub->status); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1129 | usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, |
| 1130 | hub->buffer_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1132 | kref_put(&hub->kref, hub_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | } |
| 1134 | |
| 1135 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| 1136 | { |
| 1137 | struct usb_host_interface *desc; |
| 1138 | struct usb_endpoint_descriptor *endpoint; |
| 1139 | struct usb_device *hdev; |
| 1140 | struct usb_hub *hub; |
| 1141 | |
| 1142 | desc = intf->cur_altsetting; |
| 1143 | hdev = interface_to_usbdev(intf); |
| 1144 | |
Felipe Balbi | 38f3ad5 | 2008-06-12 10:49:47 +0300 | [diff] [blame] | 1145 | if (hdev->level == MAX_TOPO_LEVEL) { |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 1146 | dev_err(&intf->dev, |
| 1147 | "Unsupported bus topology: hub nested too deep\n"); |
Felipe Balbi | 38f3ad5 | 2008-06-12 10:49:47 +0300 | [diff] [blame] | 1148 | return -E2BIG; |
| 1149 | } |
| 1150 | |
David Brownell | 89ccbdc | 2006-04-02 10:18:09 -0800 | [diff] [blame] | 1151 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
| 1152 | if (hdev->parent) { |
| 1153 | dev_warn(&intf->dev, "ignoring external hub\n"); |
| 1154 | return -ENODEV; |
| 1155 | } |
| 1156 | #endif |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
| 1159 | /* specs is not defined, but it works */ |
| 1160 | if ((desc->desc.bInterfaceSubClass != 0) && |
| 1161 | (desc->desc.bInterfaceSubClass != 1)) { |
| 1162 | descriptor_error: |
| 1163 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); |
| 1164 | return -EIO; |
| 1165 | } |
| 1166 | |
| 1167 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
| 1168 | if (desc->desc.bNumEndpoints != 1) |
| 1169 | goto descriptor_error; |
| 1170 | |
| 1171 | endpoint = &desc->endpoint[0].desc; |
| 1172 | |
Luiz Fernando N. Capitulino | fbf81c2 | 2006-09-27 11:58:53 -0700 | [diff] [blame] | 1173 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
| 1174 | if (!usb_endpoint_is_int_in(endpoint)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | goto descriptor_error; |
| 1176 | |
| 1177 | /* We found a hub */ |
| 1178 | dev_info (&intf->dev, "USB hub found\n"); |
| 1179 | |
Alan Stern | 0a1ef3b | 2005-10-24 15:38:24 -0400 | [diff] [blame] | 1180 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | if (!hub) { |
| 1182 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); |
| 1183 | return -ENOMEM; |
| 1184 | } |
| 1185 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1186 | kref_init(&hub->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | INIT_LIST_HEAD(&hub->event_list); |
| 1188 | hub->intfdev = &intf->dev; |
| 1189 | hub->hdev = hdev; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1190 | INIT_DELAYED_WORK(&hub->leds, led_work); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 1191 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 1192 | usb_get_intf(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
| 1194 | usb_set_intfdata (intf, hub); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 1195 | intf->needs_remote_wakeup = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | if (hdev->speed == USB_SPEED_HIGH) |
| 1198 | highspeed_hubs++; |
| 1199 | |
| 1200 | if (hub_configure(hub, endpoint) >= 0) |
| 1201 | return 0; |
| 1202 | |
| 1203 | hub_disconnect (intf); |
| 1204 | return -ENODEV; |
| 1205 | } |
| 1206 | |
| 1207 | static int |
| 1208 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
| 1209 | { |
| 1210 | struct usb_device *hdev = interface_to_usbdev (intf); |
| 1211 | |
| 1212 | /* assert ifno == 0 (part of hub spec) */ |
| 1213 | switch (code) { |
| 1214 | case USBDEVFS_HUB_PORTINFO: { |
| 1215 | struct usbdevfs_hub_portinfo *info = user_data; |
| 1216 | int i; |
| 1217 | |
| 1218 | spin_lock_irq(&device_state_lock); |
| 1219 | if (hdev->devnum <= 0) |
| 1220 | info->nports = 0; |
| 1221 | else { |
| 1222 | info->nports = hdev->maxchild; |
| 1223 | for (i = 0; i < info->nports; i++) { |
| 1224 | if (hdev->children[i] == NULL) |
| 1225 | info->port[i] = 0; |
| 1226 | else |
| 1227 | info->port[i] = |
| 1228 | hdev->children[i]->devnum; |
| 1229 | } |
| 1230 | } |
| 1231 | spin_unlock_irq(&device_state_lock); |
| 1232 | |
| 1233 | return info->nports + 1; |
| 1234 | } |
| 1235 | |
| 1236 | default: |
| 1237 | return -ENOSYS; |
| 1238 | } |
| 1239 | } |
| 1240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
| 1243 | { |
| 1244 | int i; |
| 1245 | |
| 1246 | for (i = 0; i < udev->maxchild; ++i) { |
| 1247 | if (udev->children[i]) |
| 1248 | recursively_mark_NOTATTACHED(udev->children[i]); |
| 1249 | } |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 1250 | if (udev->state == USB_STATE_SUSPENDED) { |
Alan Stern | ee49fb5 | 2006-11-22 16:55:54 -0500 | [diff] [blame] | 1251 | udev->discon_suspended = 1; |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 1252 | udev->active_duration -= jiffies; |
| 1253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | udev->state = USB_STATE_NOTATTACHED; |
| 1255 | } |
| 1256 | |
| 1257 | /** |
| 1258 | * usb_set_device_state - change a device's current state (usbcore, hcds) |
| 1259 | * @udev: pointer to device whose state should be changed |
| 1260 | * @new_state: new state value to be stored |
| 1261 | * |
| 1262 | * udev->state is _not_ fully protected by the device lock. Although |
| 1263 | * most transitions are made only while holding the lock, the state can |
| 1264 | * can change to USB_STATE_NOTATTACHED at almost any time. This |
| 1265 | * is so that devices can be marked as disconnected as soon as possible, |
| 1266 | * without having to wait for any semaphores to be released. As a result, |
| 1267 | * all changes to any device's state must be protected by the |
| 1268 | * device_state_lock spinlock. |
| 1269 | * |
| 1270 | * Once a device has been added to the device tree, all changes to its state |
| 1271 | * should be made using this routine. The state should _not_ be set directly. |
| 1272 | * |
| 1273 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
| 1274 | * Otherwise udev->state is set to new_state, and if new_state is |
| 1275 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
| 1276 | * to USB_STATE_NOTATTACHED. |
| 1277 | */ |
| 1278 | void usb_set_device_state(struct usb_device *udev, |
| 1279 | enum usb_device_state new_state) |
| 1280 | { |
| 1281 | unsigned long flags; |
| 1282 | |
| 1283 | spin_lock_irqsave(&device_state_lock, flags); |
| 1284 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1285 | ; /* do nothing */ |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 1286 | else if (new_state != USB_STATE_NOTATTACHED) { |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1287 | |
| 1288 | /* root hub wakeup capabilities are managed out-of-band |
| 1289 | * and may involve silicon errata ... ignore them here. |
| 1290 | */ |
| 1291 | if (udev->parent) { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1292 | if (udev->state == USB_STATE_SUSPENDED |
| 1293 | || new_state == USB_STATE_SUSPENDED) |
| 1294 | ; /* No change to wakeup settings */ |
| 1295 | else if (new_state == USB_STATE_CONFIGURED) |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1296 | device_init_wakeup(&udev->dev, |
| 1297 | (udev->actconfig->desc.bmAttributes |
| 1298 | & USB_CONFIG_ATT_WAKEUP)); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1299 | else |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1300 | device_init_wakeup(&udev->dev, 0); |
| 1301 | } |
Sarah Sharp | 1512300 | 2007-12-21 16:54:15 -0800 | [diff] [blame] | 1302 | if (udev->state == USB_STATE_SUSPENDED && |
| 1303 | new_state != USB_STATE_SUSPENDED) |
| 1304 | udev->active_duration -= jiffies; |
| 1305 | else if (new_state == USB_STATE_SUSPENDED && |
| 1306 | udev->state != USB_STATE_SUSPENDED) |
| 1307 | udev->active_duration += jiffies; |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 1308 | udev->state = new_state; |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 1309 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | recursively_mark_NOTATTACHED(udev); |
| 1311 | spin_unlock_irqrestore(&device_state_lock, flags); |
| 1312 | } |
David Vrabel | 6da9c99 | 2009-02-18 14:43:47 +0000 | [diff] [blame] | 1313 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 1315 | /* |
| 1316 | * WUSB devices are simple: they have no hubs behind, so the mapping |
| 1317 | * device <-> virtual port number becomes 1:1. Why? to simplify the |
| 1318 | * life of the device connection logic in |
| 1319 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret |
| 1320 | * handshake we need to assign a temporary address in the unauthorized |
| 1321 | * space. For simplicity we use the first virtual port number found to |
| 1322 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] |
| 1323 | * and that becomes it's address [X < 128] or its unauthorized address |
| 1324 | * [X | 0x80]. |
| 1325 | * |
| 1326 | * We add 1 as an offset to the one-based USB-stack port number |
| 1327 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr |
| 1328 | * 0 is reserved by USB for default address; (b) Linux's USB stack |
| 1329 | * uses always #1 for the root hub of the controller. So USB stack's |
| 1330 | * port #1, which is wusb virtual-port #0 has address #2. |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 1331 | * |
| 1332 | * Devices connected under xHCI are not as simple. The host controller |
| 1333 | * supports virtualization, so the hardware assigns device addresses and |
| 1334 | * the HCD must setup data structures before issuing a set address |
| 1335 | * command to the hardware. |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 1336 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | static void choose_address(struct usb_device *udev) |
| 1338 | { |
| 1339 | int devnum; |
| 1340 | struct usb_bus *bus = udev->bus; |
| 1341 | |
| 1342 | /* If khubd ever becomes multithreaded, this will need a lock */ |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 1343 | if (udev->wusb) { |
| 1344 | devnum = udev->portnum + 1; |
| 1345 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); |
| 1346 | } else { |
| 1347 | /* Try to allocate the next devnum beginning at |
| 1348 | * bus->devnum_next. */ |
| 1349 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
| 1350 | bus->devnum_next); |
| 1351 | if (devnum >= 128) |
| 1352 | devnum = find_next_zero_bit(bus->devmap.devicemap, |
| 1353 | 128, 1); |
| 1354 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); |
| 1355 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | if (devnum < 128) { |
| 1357 | set_bit(devnum, bus->devmap.devicemap); |
| 1358 | udev->devnum = devnum; |
| 1359 | } |
| 1360 | } |
| 1361 | |
| 1362 | static void release_address(struct usb_device *udev) |
| 1363 | { |
| 1364 | if (udev->devnum > 0) { |
| 1365 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
| 1366 | udev->devnum = -1; |
| 1367 | } |
| 1368 | } |
| 1369 | |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 1370 | static void update_address(struct usb_device *udev, int devnum) |
| 1371 | { |
| 1372 | /* The address for a WUSB device is managed by wusbcore. */ |
| 1373 | if (!udev->wusb) |
| 1374 | udev->devnum = devnum; |
| 1375 | } |
| 1376 | |
Alan Stern | d5d4db7 | 2007-05-29 16:34:52 -0400 | [diff] [blame] | 1377 | #ifdef CONFIG_USB_SUSPEND |
| 1378 | |
| 1379 | static void usb_stop_pm(struct usb_device *udev) |
| 1380 | { |
| 1381 | /* Synchronize with the ksuspend thread to prevent any more |
| 1382 | * autosuspend requests from being submitted, and decrement |
| 1383 | * the parent's count of unsuspended children. |
| 1384 | */ |
| 1385 | usb_pm_lock(udev); |
| 1386 | if (udev->parent && !udev->discon_suspended) |
| 1387 | usb_autosuspend_device(udev->parent); |
| 1388 | usb_pm_unlock(udev); |
| 1389 | |
Alan Stern | 9ac39f2 | 2008-11-12 16:19:49 -0500 | [diff] [blame] | 1390 | /* Stop any autosuspend or autoresume requests already submitted */ |
| 1391 | cancel_delayed_work_sync(&udev->autosuspend); |
| 1392 | cancel_work_sync(&udev->autoresume); |
Alan Stern | d5d4db7 | 2007-05-29 16:34:52 -0400 | [diff] [blame] | 1393 | } |
| 1394 | |
| 1395 | #else |
| 1396 | |
| 1397 | static inline void usb_stop_pm(struct usb_device *udev) |
| 1398 | { } |
| 1399 | |
| 1400 | #endif |
| 1401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | /** |
| 1403 | * usb_disconnect - disconnect a device (usbcore-internal) |
| 1404 | * @pdev: pointer to device being disconnected |
| 1405 | * Context: !in_interrupt () |
| 1406 | * |
| 1407 | * Something got disconnected. Get rid of it and all of its children. |
| 1408 | * |
| 1409 | * If *pdev is a normal device then the parent hub must already be locked. |
| 1410 | * If *pdev is a root hub then this routine will acquire the |
| 1411 | * usb_bus_list_lock on behalf of the caller. |
| 1412 | * |
| 1413 | * Only hub drivers (including virtual root hub drivers for host |
| 1414 | * controllers) should ever call this. |
| 1415 | * |
| 1416 | * This call is synchronous, and may not be used in an interrupt context. |
| 1417 | */ |
| 1418 | void usb_disconnect(struct usb_device **pdev) |
| 1419 | { |
| 1420 | struct usb_device *udev = *pdev; |
| 1421 | int i; |
| 1422 | |
| 1423 | if (!udev) { |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1424 | pr_debug ("%s nodev\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | return; |
| 1426 | } |
| 1427 | |
| 1428 | /* mark the device as inactive, so any further urb submissions for |
| 1429 | * this device (and any of its children) will fail immediately. |
| 1430 | * this quiesces everyting except pending urbs. |
| 1431 | */ |
| 1432 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
| 1434 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1435 | usb_lock_device(udev); |
| 1436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | /* Free up all the children before we remove this device */ |
| 1438 | for (i = 0; i < USB_MAXCHILDREN; i++) { |
| 1439 | if (udev->children[i]) |
| 1440 | usb_disconnect(&udev->children[i]); |
| 1441 | } |
| 1442 | |
| 1443 | /* deallocate hcd/hardware state ... nuking all pending urbs and |
| 1444 | * cleaning up all state associated with the current configuration |
| 1445 | * so that the hardware is now fully quiesced. |
| 1446 | */ |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1447 | dev_dbg (&udev->dev, "unregistering device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | usb_disable_device(udev, 0); |
Alan Stern | cde217a | 2008-10-21 15:28:46 -0400 | [diff] [blame] | 1449 | usb_hcd_synchronize_unlinks(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1451 | usb_remove_ep_devs(&udev->ep0); |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1452 | usb_unlock_device(udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1453 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1454 | /* Unregister the device. The device driver is responsible |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1455 | * for de-configuring the device and invoking the remove-device |
| 1456 | * notifier chain (used by usbfs and possibly others). |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1457 | */ |
| 1458 | device_del(&udev->dev); |
| 1459 | |
| 1460 | /* Free the device number and delete the parent's children[] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | * (or root_hub) pointer. |
| 1462 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | release_address(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | |
| 1465 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
| 1466 | spin_lock_irq(&device_state_lock); |
| 1467 | *pdev = NULL; |
| 1468 | spin_unlock_irq(&device_state_lock); |
| 1469 | |
Alan Stern | d5d4db7 | 2007-05-29 16:34:52 -0400 | [diff] [blame] | 1470 | usb_stop_pm(udev); |
Alan Stern | ee49fb5 | 2006-11-22 16:55:54 -0500 | [diff] [blame] | 1471 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1472 | put_device(&udev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1475 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | static void show_string(struct usb_device *udev, char *id, char *string) |
| 1477 | { |
| 1478 | if (!string) |
| 1479 | return; |
| 1480 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); |
| 1481 | } |
| 1482 | |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1483 | static void announce_device(struct usb_device *udev) |
| 1484 | { |
| 1485 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", |
| 1486 | le16_to_cpu(udev->descriptor.idVendor), |
| 1487 | le16_to_cpu(udev->descriptor.idProduct)); |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 1488 | dev_info(&udev->dev, |
| 1489 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1490 | udev->descriptor.iManufacturer, |
| 1491 | udev->descriptor.iProduct, |
| 1492 | udev->descriptor.iSerialNumber); |
| 1493 | show_string(udev, "Product", udev->product); |
| 1494 | show_string(udev, "Manufacturer", udev->manufacturer); |
| 1495 | show_string(udev, "SerialNumber", udev->serial); |
| 1496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | #else |
Greg Kroah-Hartman | f2a383e | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1498 | static inline void announce_device(struct usb_device *udev) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | #endif |
| 1500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | #ifdef CONFIG_USB_OTG |
| 1502 | #include "otg_whitelist.h" |
| 1503 | #endif |
| 1504 | |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 1505 | /** |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1506 | * usb_configure_device_otg - FIXME (usbcore-internal) |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 1507 | * @udev: newly addressed device (in ADDRESS state) |
| 1508 | * |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1509 | * Do configuration for On-The-Go devices |
Oliver Neukum | 3ede760 | 2007-01-11 14:35:50 +0100 | [diff] [blame] | 1510 | */ |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1511 | static int usb_configure_device_otg(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | { |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1513 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
| 1515 | #ifdef CONFIG_USB_OTG |
| 1516 | /* |
| 1517 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
| 1518 | * to wake us after we've powered off VBUS; and HNP, switching roles |
| 1519 | * "host" to "peripheral". The OTG descriptor helps figure this out. |
| 1520 | */ |
| 1521 | if (!udev->bus->is_b_host |
| 1522 | && udev->config |
| 1523 | && udev->parent == udev->bus->root_hub) { |
| 1524 | struct usb_otg_descriptor *desc = 0; |
| 1525 | struct usb_bus *bus = udev->bus; |
| 1526 | |
| 1527 | /* descriptor may appear anywhere in config */ |
| 1528 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], |
| 1529 | le16_to_cpu(udev->config[0].desc.wTotalLength), |
| 1530 | USB_DT_OTG, (void **) &desc) == 0) { |
| 1531 | if (desc->bmAttributes & USB_OTG_HNP) { |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 1532 | unsigned port1 = udev->portnum; |
David Brownell | fc849b8 | 2006-09-18 16:53:26 -0700 | [diff] [blame] | 1533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | dev_info(&udev->dev, |
| 1535 | "Dual-Role OTG device on %sHNP port\n", |
| 1536 | (port1 == bus->otg_port) |
| 1537 | ? "" : "non-"); |
| 1538 | |
| 1539 | /* enable HNP before suspend, it's simpler */ |
| 1540 | if (port1 == bus->otg_port) |
| 1541 | bus->b_hnp_enable = 1; |
| 1542 | err = usb_control_msg(udev, |
| 1543 | usb_sndctrlpipe(udev, 0), |
| 1544 | USB_REQ_SET_FEATURE, 0, |
| 1545 | bus->b_hnp_enable |
| 1546 | ? USB_DEVICE_B_HNP_ENABLE |
| 1547 | : USB_DEVICE_A_ALT_HNP_SUPPORT, |
| 1548 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 1549 | if (err < 0) { |
| 1550 | /* OTG MESSAGE: report errors here, |
| 1551 | * customize to match your product. |
| 1552 | */ |
| 1553 | dev_info(&udev->dev, |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 1554 | "can't set HNP mode: %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | err); |
| 1556 | bus->b_hnp_enable = 0; |
| 1557 | } |
| 1558 | } |
| 1559 | } |
| 1560 | } |
| 1561 | |
| 1562 | if (!is_targeted(udev)) { |
| 1563 | |
| 1564 | /* Maybe it can talk to us, though we can't talk to it. |
| 1565 | * (Includes HNP test device.) |
| 1566 | */ |
| 1567 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { |
David Brownell | 634a84f | 2009-01-15 13:51:28 -0800 | [diff] [blame] | 1568 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | if (err < 0) |
| 1570 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
| 1571 | } |
Vikram Pandita | ffcdc18 | 2007-05-25 21:31:07 -0700 | [diff] [blame] | 1572 | err = -ENOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | goto fail; |
| 1574 | } |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1575 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | #endif |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1577 | return err; |
| 1578 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1580 | |
| 1581 | /** |
| 1582 | * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) |
| 1583 | * @udev: newly addressed device (in ADDRESS state) |
| 1584 | * |
| 1585 | * This is only called by usb_new_device() and usb_authorize_device() |
| 1586 | * and FIXME -- all comments that apply to them apply here wrt to |
| 1587 | * environment. |
| 1588 | * |
| 1589 | * If the device is WUSB and not authorized, we don't attempt to read |
| 1590 | * the string descriptors, as they will be errored out by the device |
| 1591 | * until it has been authorized. |
| 1592 | */ |
| 1593 | static int usb_configure_device(struct usb_device *udev) |
| 1594 | { |
| 1595 | int err; |
| 1596 | |
| 1597 | if (udev->config == NULL) { |
| 1598 | err = usb_get_configuration(udev); |
| 1599 | if (err < 0) { |
| 1600 | dev_err(&udev->dev, "can't read configurations, error %d\n", |
| 1601 | err); |
| 1602 | goto fail; |
| 1603 | } |
| 1604 | } |
| 1605 | if (udev->wusb == 1 && udev->authorized == 0) { |
| 1606 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1607 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1608 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1609 | } |
| 1610 | else { |
| 1611 | /* read the standard strings and cache them if present */ |
| 1612 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
| 1613 | udev->manufacturer = usb_cache_string(udev, |
| 1614 | udev->descriptor.iManufacturer); |
| 1615 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
| 1616 | } |
| 1617 | err = usb_configure_device_otg(udev); |
| 1618 | fail: |
| 1619 | return err; |
| 1620 | } |
| 1621 | |
| 1622 | |
| 1623 | /** |
| 1624 | * usb_new_device - perform initial device setup (usbcore-internal) |
| 1625 | * @udev: newly addressed device (in ADDRESS state) |
| 1626 | * |
| 1627 | * This is called with devices which have been enumerated, but not yet |
| 1628 | * configured. The device descriptor is available, but not descriptors |
| 1629 | * for any device configuration. The caller must have locked either |
| 1630 | * the parent hub (if udev is a normal device) or else the |
| 1631 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to |
| 1632 | * udev has already been installed, but udev is not yet visible through |
| 1633 | * sysfs or other filesystem code. |
| 1634 | * |
| 1635 | * It will return if the device is configured properly or not. Zero if |
| 1636 | * the interface was registered with the driver core; else a negative |
| 1637 | * errno value. |
| 1638 | * |
| 1639 | * This call is synchronous, and may not be used in an interrupt context. |
| 1640 | * |
| 1641 | * Only the hub driver or root-hub registrar should ever call this. |
| 1642 | */ |
| 1643 | int usb_new_device(struct usb_device *udev) |
| 1644 | { |
| 1645 | int err; |
| 1646 | |
Alan Stern | 6cd1320 | 2008-11-13 15:08:30 -0500 | [diff] [blame] | 1647 | /* Increment the parent's count of unsuspended children */ |
| 1648 | if (udev->parent) |
| 1649 | usb_autoresume_device(udev->parent); |
| 1650 | |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1651 | usb_detect_quirks(udev); /* Determine quirks */ |
| 1652 | err = usb_configure_device(udev); /* detect & probe dev/intfs */ |
| 1653 | if (err < 0) |
| 1654 | goto fail; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 1655 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
| 1656 | udev->devnum, udev->bus->busnum, |
| 1657 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1658 | /* export the usbdev device-node for libusb */ |
| 1659 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, |
| 1660 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
| 1661 | |
Alan Stern | 6cd1320 | 2008-11-13 15:08:30 -0500 | [diff] [blame] | 1662 | /* Tell the world! */ |
| 1663 | announce_device(udev); |
Alan Stern | 195af2c | 2007-07-16 15:28:19 -0400 | [diff] [blame] | 1664 | |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1665 | /* Register the device. The device driver is responsible |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1666 | * for configuring the device and invoking the add-device |
| 1667 | * notifier chain (used by usbfs and possibly others). |
Alan Stern | 782da72 | 2006-07-01 22:09:35 -0400 | [diff] [blame] | 1668 | */ |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1669 | err = device_add(&udev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | if (err) { |
| 1671 | dev_err(&udev->dev, "can't device_add, error %d\n", err); |
| 1672 | goto fail; |
| 1673 | } |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1674 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1675 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
Greg Kroah-Hartman | c066475 | 2006-08-11 01:55:12 -0700 | [diff] [blame] | 1676 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
| 1678 | fail: |
| 1679 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
Alan Stern | 6cd1320 | 2008-11-13 15:08:30 -0500 | [diff] [blame] | 1680 | usb_stop_pm(udev); |
Inaky Perez-Gonzalez | d9d16e8 | 2007-07-31 20:34:05 -0700 | [diff] [blame] | 1681 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | } |
| 1683 | |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 1684 | |
| 1685 | /** |
Randy Dunlap | fd39c86 | 2007-10-15 17:30:02 -0700 | [diff] [blame] | 1686 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
| 1687 | * @usb_dev: USB device |
| 1688 | * |
| 1689 | * Move the USB device to a very basic state where interfaces are disabled |
| 1690 | * and the device is in fact unconfigured and unusable. |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 1691 | * |
| 1692 | * We share a lock (that we have) with device_del(), so we need to |
| 1693 | * defer its call. |
| 1694 | */ |
| 1695 | int usb_deauthorize_device(struct usb_device *usb_dev) |
| 1696 | { |
| 1697 | unsigned cnt; |
| 1698 | usb_lock_device(usb_dev); |
| 1699 | if (usb_dev->authorized == 0) |
| 1700 | goto out_unauthorized; |
| 1701 | usb_dev->authorized = 0; |
| 1702 | usb_set_configuration(usb_dev, -1); |
| 1703 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1704 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1705 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
| 1706 | kfree(usb_dev->config); |
| 1707 | usb_dev->config = NULL; |
| 1708 | for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) |
| 1709 | kfree(usb_dev->rawdescriptors[cnt]); |
| 1710 | usb_dev->descriptor.bNumConfigurations = 0; |
| 1711 | kfree(usb_dev->rawdescriptors); |
| 1712 | out_unauthorized: |
| 1713 | usb_unlock_device(usb_dev); |
| 1714 | return 0; |
| 1715 | } |
| 1716 | |
| 1717 | |
| 1718 | int usb_authorize_device(struct usb_device *usb_dev) |
| 1719 | { |
| 1720 | int result = 0, c; |
| 1721 | usb_lock_device(usb_dev); |
| 1722 | if (usb_dev->authorized == 1) |
| 1723 | goto out_authorized; |
| 1724 | kfree(usb_dev->product); |
| 1725 | usb_dev->product = NULL; |
| 1726 | kfree(usb_dev->manufacturer); |
| 1727 | usb_dev->manufacturer = NULL; |
| 1728 | kfree(usb_dev->serial); |
| 1729 | usb_dev->serial = NULL; |
| 1730 | result = usb_autoresume_device(usb_dev); |
| 1731 | if (result < 0) { |
| 1732 | dev_err(&usb_dev->dev, |
| 1733 | "can't autoresume for authorization: %d\n", result); |
| 1734 | goto error_autoresume; |
| 1735 | } |
| 1736 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); |
| 1737 | if (result < 0) { |
| 1738 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " |
| 1739 | "authorization: %d\n", result); |
| 1740 | goto error_device_descriptor; |
| 1741 | } |
| 1742 | usb_dev->authorized = 1; |
| 1743 | result = usb_configure_device(usb_dev); |
| 1744 | if (result < 0) |
| 1745 | goto error_configure; |
| 1746 | /* Choose and set the configuration. This registers the interfaces |
| 1747 | * with the driver core and lets interface drivers bind to them. |
| 1748 | */ |
Greg Kroah-Hartman | b5ea060 | 2007-08-02 22:44:27 -0600 | [diff] [blame] | 1749 | c = usb_choose_configuration(usb_dev); |
Inaky Perez-Gonzalez | 93993a0 | 2007-07-31 20:34:06 -0700 | [diff] [blame] | 1750 | if (c >= 0) { |
| 1751 | result = usb_set_configuration(usb_dev, c); |
| 1752 | if (result) { |
| 1753 | dev_err(&usb_dev->dev, |
| 1754 | "can't set config #%d, error %d\n", c, result); |
| 1755 | /* This need not be fatal. The user can try to |
| 1756 | * set other configurations. */ |
| 1757 | } |
| 1758 | } |
| 1759 | dev_info(&usb_dev->dev, "authorized to connect\n"); |
| 1760 | error_configure: |
| 1761 | error_device_descriptor: |
| 1762 | error_autoresume: |
| 1763 | out_authorized: |
| 1764 | usb_unlock_device(usb_dev); // complements locktree |
| 1765 | return result; |
| 1766 | } |
| 1767 | |
| 1768 | |
Inaky Perez-Gonzalez | 0165de0 | 2006-08-25 19:35:29 -0700 | [diff] [blame] | 1769 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
| 1770 | static unsigned hub_is_wusb(struct usb_hub *hub) |
| 1771 | { |
| 1772 | struct usb_hcd *hcd; |
| 1773 | if (hub->hdev->parent != NULL) /* not a root hub? */ |
| 1774 | return 0; |
| 1775 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); |
| 1776 | return hcd->wireless; |
| 1777 | } |
| 1778 | |
| 1779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | #define PORT_RESET_TRIES 5 |
| 1781 | #define SET_ADDRESS_TRIES 2 |
| 1782 | #define GET_DESCRIPTOR_TRIES 2 |
| 1783 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) |
| 1784 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) |
| 1785 | |
| 1786 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| 1787 | #define HUB_SHORT_RESET_TIME 10 |
| 1788 | #define HUB_LONG_RESET_TIME 200 |
| 1789 | #define HUB_RESET_TIMEOUT 500 |
| 1790 | |
| 1791 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
| 1792 | struct usb_device *udev, unsigned int delay) |
| 1793 | { |
| 1794 | int delay_time, ret; |
| 1795 | u16 portstatus; |
| 1796 | u16 portchange; |
| 1797 | |
| 1798 | for (delay_time = 0; |
| 1799 | delay_time < HUB_RESET_TIMEOUT; |
| 1800 | delay_time += delay) { |
| 1801 | /* wait to give the device a chance to reset */ |
| 1802 | msleep(delay); |
| 1803 | |
| 1804 | /* read and decode port status */ |
| 1805 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 1806 | if (ret < 0) |
| 1807 | return ret; |
| 1808 | |
| 1809 | /* Device went away? */ |
| 1810 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
| 1811 | return -ENOTCONN; |
| 1812 | |
Alan Stern | dd4dd19 | 2007-05-04 11:55:54 -0400 | [diff] [blame] | 1813 | /* bomb out completely if the connection bounced */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
Alan Stern | dd4dd19 | 2007-05-04 11:55:54 -0400 | [diff] [blame] | 1815 | return -ENOTCONN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | |
| 1817 | /* if we`ve finished resetting, then break out of the loop */ |
| 1818 | if (!(portstatus & USB_PORT_STAT_RESET) && |
| 1819 | (portstatus & USB_PORT_STAT_ENABLE)) { |
Inaky Perez-Gonzalez | 0165de0 | 2006-08-25 19:35:29 -0700 | [diff] [blame] | 1820 | if (hub_is_wusb(hub)) |
| 1821 | udev->speed = USB_SPEED_VARIABLE; |
| 1822 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | udev->speed = USB_SPEED_HIGH; |
| 1824 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| 1825 | udev->speed = USB_SPEED_LOW; |
| 1826 | else |
| 1827 | udev->speed = USB_SPEED_FULL; |
| 1828 | return 0; |
| 1829 | } |
| 1830 | |
| 1831 | /* switch to the long delay after two short delay failures */ |
| 1832 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
| 1833 | delay = HUB_LONG_RESET_TIME; |
| 1834 | |
| 1835 | dev_dbg (hub->intfdev, |
| 1836 | "port %d not reset yet, waiting %dms\n", |
| 1837 | port1, delay); |
| 1838 | } |
| 1839 | |
| 1840 | return -EBUSY; |
| 1841 | } |
| 1842 | |
| 1843 | static int hub_port_reset(struct usb_hub *hub, int port1, |
| 1844 | struct usb_device *udev, unsigned int delay) |
| 1845 | { |
| 1846 | int i, status; |
| 1847 | |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 1848 | /* Block EHCI CF initialization during the port reset. |
| 1849 | * Some companion controllers don't like it when they mix. |
| 1850 | */ |
| 1851 | down_read(&ehci_cf_port_reset_rwsem); |
| 1852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | /* Reset the port */ |
| 1854 | for (i = 0; i < PORT_RESET_TRIES; i++) { |
| 1855 | status = set_port_feature(hub->hdev, |
| 1856 | port1, USB_PORT_FEAT_RESET); |
| 1857 | if (status) |
| 1858 | dev_err(hub->intfdev, |
| 1859 | "cannot reset port %d (err = %d)\n", |
| 1860 | port1, status); |
| 1861 | else { |
| 1862 | status = hub_port_wait_reset(hub, port1, udev, delay); |
David Brownell | dd16525 | 2005-08-31 10:45:25 -0700 | [diff] [blame] | 1863 | if (status && status != -ENOTCONN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | dev_dbg(hub->intfdev, |
| 1865 | "port_wait_reset: err = %d\n", |
| 1866 | status); |
| 1867 | } |
| 1868 | |
| 1869 | /* return on disconnect or reset */ |
| 1870 | switch (status) { |
| 1871 | case 0: |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 1872 | /* TRSTRCY = 10 ms; plus some extra */ |
| 1873 | msleep(10 + 40); |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 1874 | update_address(udev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | /* FALL THROUGH */ |
| 1876 | case -ENOTCONN: |
| 1877 | case -ENODEV: |
| 1878 | clear_port_feature(hub->hdev, |
| 1879 | port1, USB_PORT_FEAT_C_RESET); |
| 1880 | /* FIXME need disconnect() for NOTATTACHED device */ |
| 1881 | usb_set_device_state(udev, status |
| 1882 | ? USB_STATE_NOTATTACHED |
| 1883 | : USB_STATE_DEFAULT); |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 1884 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | } |
| 1886 | |
| 1887 | dev_dbg (hub->intfdev, |
| 1888 | "port %d not enabled, trying reset again...\n", |
| 1889 | port1); |
| 1890 | delay = HUB_LONG_RESET_TIME; |
| 1891 | } |
| 1892 | |
| 1893 | dev_err (hub->intfdev, |
| 1894 | "Cannot enable port %i. Maybe the USB cable is bad?\n", |
| 1895 | port1); |
| 1896 | |
Alan Stern | 32fe019 | 2007-10-10 16:27:07 -0400 | [diff] [blame] | 1897 | done: |
| 1898 | up_read(&ehci_cf_port_reset_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | return status; |
| 1900 | } |
| 1901 | |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 1902 | #ifdef CONFIG_PM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 1904 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
| 1905 | USB_PORT_STAT_SUSPEND) |
| 1906 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) |
| 1907 | |
| 1908 | /* Determine whether the device on a port is ready for a normal resume, |
| 1909 | * is ready for a reset-resume, or should be disconnected. |
| 1910 | */ |
| 1911 | static int check_port_resume_type(struct usb_device *udev, |
| 1912 | struct usb_hub *hub, int port1, |
| 1913 | int status, unsigned portchange, unsigned portstatus) |
| 1914 | { |
| 1915 | /* Is the device still present? */ |
| 1916 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { |
| 1917 | if (status >= 0) |
| 1918 | status = -ENODEV; |
| 1919 | } |
| 1920 | |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 1921 | /* Can't do a normal resume if the port isn't enabled, |
| 1922 | * so try a reset-resume instead. |
| 1923 | */ |
| 1924 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { |
| 1925 | if (udev->persist_enabled) |
| 1926 | udev->reset_resume = 1; |
| 1927 | else |
| 1928 | status = -ENODEV; |
| 1929 | } |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 1930 | |
| 1931 | if (status) { |
| 1932 | dev_dbg(hub->intfdev, |
| 1933 | "port %d status %04x.%04x after resume, %d\n", |
| 1934 | port1, portchange, portstatus, status); |
| 1935 | } else if (udev->reset_resume) { |
| 1936 | |
| 1937 | /* Late port handoff can set status-change bits */ |
| 1938 | if (portchange & USB_PORT_STAT_C_CONNECTION) |
| 1939 | clear_port_feature(hub->hdev, port1, |
| 1940 | USB_PORT_FEAT_C_CONNECTION); |
| 1941 | if (portchange & USB_PORT_STAT_C_ENABLE) |
| 1942 | clear_port_feature(hub->hdev, port1, |
| 1943 | USB_PORT_FEAT_C_ENABLE); |
| 1944 | } |
| 1945 | |
| 1946 | return status; |
| 1947 | } |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | #ifdef CONFIG_USB_SUSPEND |
| 1950 | |
| 1951 | /* |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 1952 | * usb_port_suspend - suspend a usb device's upstream port |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 1953 | * @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] | 1954 | * Context: must be able to sleep; device not locked; pm locks held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | * |
| 1956 | * Suspends a USB device that isn't in active use, conserving power. |
| 1957 | * Devices may wake out of a suspend, if anything important happens, |
| 1958 | * using the remote wakeup mechanism. They may also be taken out of |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 1959 | * suspend by the host, using usb_port_resume(). It's also routine |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | * to disconnect devices while they are suspended. |
| 1961 | * |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1962 | * This only affects the USB hardware for a device; its interfaces |
| 1963 | * (and, for hubs, child devices) must already have been suspended. |
| 1964 | * |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 1965 | * Selective port suspend reduces power; most suspended devices draw |
| 1966 | * less than 500 uA. It's also used in OTG, along with remote wakeup. |
| 1967 | * All devices below the suspended port are also suspended. |
| 1968 | * |
| 1969 | * Devices leave suspend state when the host wakes them up. Some devices |
| 1970 | * also support "remote wakeup", where the device can activate the USB |
| 1971 | * tree above them to deliver data, such as a keypress or packet. In |
| 1972 | * some cases, this wakes the USB host. |
| 1973 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | * Suspending OTG devices may trigger HNP, if that's been enabled |
| 1975 | * between a pair of dual-role devices. That will change roles, such |
| 1976 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
| 1977 | * |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 1978 | * Devices on USB hub ports have only one "suspend" state, corresponding |
| 1979 | * to ACPI D2, "may cause the device to lose some context". |
| 1980 | * State transitions include: |
| 1981 | * |
| 1982 | * - suspend, resume ... when the VBUS power link stays live |
| 1983 | * - suspend, disconnect ... VBUS lost |
| 1984 | * |
| 1985 | * Once VBUS drop breaks the circuit, the port it's using has to go through |
| 1986 | * normal re-enumeration procedures, starting with enabling VBUS power. |
| 1987 | * Other than re-initializing the hub (plug/unplug, except for root hubs), |
| 1988 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd |
| 1989 | * timer, no SRP, no requests through sysfs. |
| 1990 | * |
| 1991 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when |
| 1992 | * the root hub for their bus goes into global suspend ... so we don't |
| 1993 | * (falsely) update the device power state to say it suspended. |
| 1994 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | * Returns 0 on success, else negative errno. |
| 1996 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 1997 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | { |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 1999 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2000 | int port1 = udev->portnum; |
| 2001 | int status; |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 2002 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2003 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); |
| 2004 | |
| 2005 | /* enable remote wakeup when appropriate; this lets the device |
| 2006 | * wake up the upstream hub (including maybe the root hub). |
| 2007 | * |
| 2008 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when |
| 2009 | * we don't explicitly enable it here. |
| 2010 | */ |
| 2011 | if (udev->do_remote_wakeup) { |
| 2012 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 2013 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| 2014 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2015 | NULL, 0, |
| 2016 | USB_CTRL_SET_TIMEOUT); |
| 2017 | if (status) |
| 2018 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
| 2019 | status); |
| 2020 | } |
| 2021 | |
| 2022 | /* see 7.1.7.6 */ |
| 2023 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); |
| 2024 | if (status) { |
| 2025 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
| 2026 | port1, status); |
| 2027 | /* paranoia: "should not happen" */ |
| 2028 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 2029 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| 2030 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2031 | NULL, 0, |
| 2032 | USB_CTRL_SET_TIMEOUT); |
| 2033 | } else { |
| 2034 | /* device has up to 10 msec to fully suspend */ |
| 2035 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2036 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2037 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
| 2038 | msleep(10); |
| 2039 | } |
Alan Stern | 4956ecc | 2007-05-30 16:51:28 -0400 | [diff] [blame] | 2040 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | } |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 2042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | /* |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 2044 | * If the USB "suspend" state is in use (rather than "global suspend"), |
| 2045 | * many devices will be individually taken out of suspend state using |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2046 | * special "resume" signaling. This routine kicks in shortly after |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | * hardware resume signaling is finished, either because of selective |
| 2048 | * resume (by host) or remote wakeup (by device) ... now see what changed |
| 2049 | * in the tree that's rooted at this device. |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2050 | * |
| 2051 | * If @udev->reset_resume is set then the device is reset before the |
| 2052 | * status check is done. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | */ |
Alan Stern | 140d8f6 | 2006-07-01 22:07:21 -0400 | [diff] [blame] | 2054 | static int finish_port_resume(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | { |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2056 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | u16 devstatus; |
| 2058 | |
| 2059 | /* caller owns the udev device lock */ |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2060 | dev_dbg(&udev->dev, "%s\n", |
| 2061 | udev->reset_resume ? "finish reset-resume" : "finish resume"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | |
| 2063 | /* usb ch9 identifies four variants of SUSPENDED, based on what |
| 2064 | * state the device resumes to. Linux currently won't see the |
| 2065 | * first two on the host side; they'd be inside hub_port_init() |
| 2066 | * during many timeouts, but khubd can't suspend until later. |
| 2067 | */ |
| 2068 | usb_set_device_state(udev, udev->actconfig |
| 2069 | ? USB_STATE_CONFIGURED |
| 2070 | : USB_STATE_ADDRESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2072 | /* 10.5.4.5 says not to reset a suspended port if the attached |
| 2073 | * device is enabled for remote wakeup. Hence the reset |
| 2074 | * operation is carried out here, after the port has been |
| 2075 | * resumed. |
| 2076 | */ |
| 2077 | if (udev->reset_resume) |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 2078 | retry_reset_resume: |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 2079 | status = usb_reset_and_verify_device(udev); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2080 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | /* 10.5.4.5 says be sure devices in the tree are still there. |
| 2082 | * For now let's assume the device didn't go crazy on resume, |
| 2083 | * and device drivers will know about any resume quirks. |
| 2084 | */ |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2085 | if (status == 0) { |
Alan Stern | 46dede4 | 2007-08-14 10:56:10 -0400 | [diff] [blame] | 2086 | devstatus = 0; |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2087 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
| 2088 | if (status >= 0) |
Alan Stern | 46dede4 | 2007-08-14 10:56:10 -0400 | [diff] [blame] | 2089 | status = (status > 0 ? 0 : -ENODEV); |
Alan Stern | 86c57ed | 2008-06-30 11:14:43 -0400 | [diff] [blame] | 2090 | |
| 2091 | /* If a normal resume failed, try doing a reset-resume */ |
| 2092 | if (status && !udev->reset_resume && udev->persist_enabled) { |
| 2093 | dev_dbg(&udev->dev, "retry with reset-resume\n"); |
| 2094 | udev->reset_resume = 1; |
| 2095 | goto retry_reset_resume; |
| 2096 | } |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2097 | } |
Alan Stern | b40b7a9 | 2006-06-19 15:12:38 -0400 | [diff] [blame] | 2098 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2099 | if (status) { |
| 2100 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", |
| 2101 | status); |
| 2102 | } else if (udev->actconfig) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | le16_to_cpus(&devstatus); |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 2104 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | status = usb_control_msg(udev, |
| 2106 | usb_sndctrlpipe(udev, 0), |
| 2107 | USB_REQ_CLEAR_FEATURE, |
| 2108 | USB_RECIP_DEVICE, |
| 2109 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 2110 | NULL, 0, |
| 2111 | USB_CTRL_SET_TIMEOUT); |
Alan Stern | a8e7c56 | 2006-07-01 22:11:02 -0400 | [diff] [blame] | 2112 | if (status) |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2113 | dev_dbg(&udev->dev, |
| 2114 | "disable remote wakeup, status %d\n", |
| 2115 | status); |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 2116 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | } |
| 2119 | return status; |
| 2120 | } |
| 2121 | |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2122 | /* |
| 2123 | * usb_port_resume - re-activate a suspended usb device's upstream port |
| 2124 | * @udev: device to re-activate, not a root hub |
| 2125 | * Context: must be able to sleep; device not locked; pm locks held |
| 2126 | * |
| 2127 | * This will re-activate the suspended device, increasing power usage |
| 2128 | * while letting drivers communicate again with its endpoints. |
| 2129 | * USB resume explicitly guarantees that the power session between |
| 2130 | * the host and the device is the same as it was when the device |
| 2131 | * suspended. |
| 2132 | * |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 2133 | * If @udev->reset_resume is set then this routine won't check that the |
| 2134 | * port is still enabled. Furthermore, finish_port_resume() above will |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2135 | * reset @udev. The end result is that a broken power session can be |
| 2136 | * recovered and @udev will appear to persist across a loss of VBUS power. |
| 2137 | * |
| 2138 | * For example, if a host controller doesn't maintain VBUS suspend current |
| 2139 | * during a system sleep or is reset when the system wakes up, all the USB |
| 2140 | * power sessions below it will be broken. This is especially troublesome |
| 2141 | * for mass-storage devices containing mounted filesystems, since the |
| 2142 | * device will appear to have disconnected and all the memory mappings |
| 2143 | * to it will be lost. Using the USB_PERSIST facility, the device can be |
| 2144 | * made to appear as if it had not disconnected. |
| 2145 | * |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 2146 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 2147 | * every effort to insure that the same device is present after the |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2148 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
| 2149 | * quite possible for a device to remain unaltered but its media to be |
| 2150 | * changed. If the user replaces a flash memory card while the system is |
| 2151 | * asleep, he will have only himself to blame when the filesystem on the |
| 2152 | * new card is corrupted and the system crashes. |
| 2153 | * |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2154 | * Returns 0 on success, else negative errno. |
| 2155 | */ |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2156 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | { |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2158 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2159 | int port1 = udev->portnum; |
| 2160 | int status; |
| 2161 | u16 portchange, portstatus; |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 2162 | |
| 2163 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
| 2164 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2165 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) |
| 2166 | goto SuspendCleared; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | |
| 2168 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); |
| 2169 | |
Alan Stern | d5cbad4 | 2006-08-11 16:52:39 -0400 | [diff] [blame] | 2170 | set_bit(port1, hub->busy_bits); |
| 2171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
| 2173 | status = clear_port_feature(hub->hdev, |
| 2174 | port1, USB_PORT_FEAT_SUSPEND); |
| 2175 | if (status) { |
Alan Stern | 624d6c0 | 2007-05-30 15:35:16 -0400 | [diff] [blame] | 2176 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
| 2177 | port1, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | /* drive resume for at least 20 msec */ |
Alan Stern | 686314c | 2007-05-30 15:34:36 -0400 | [diff] [blame] | 2180 | dev_dbg(&udev->dev, "usb %sresume\n", |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2181 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | msleep(25); |
| 2183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
| 2185 | * stop resume signaling. Then finish the resume |
| 2186 | * sequence. |
| 2187 | */ |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 2188 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2189 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2190 | /* TRSMRCY = 10 msec */ |
| 2191 | msleep(10); |
| 2192 | } |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2193 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2194 | SuspendCleared: |
| 2195 | if (status == 0) { |
| 2196 | if (portchange & USB_PORT_STAT_C_SUSPEND) |
| 2197 | clear_port_feature(hub->hdev, port1, |
| 2198 | USB_PORT_FEAT_C_SUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | |
Alan Stern | d5cbad4 | 2006-08-11 16:52:39 -0400 | [diff] [blame] | 2201 | clear_bit(port1, hub->busy_bits); |
Alan Stern | d5cbad4 | 2006-08-11 16:52:39 -0400 | [diff] [blame] | 2202 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2203 | status = check_port_resume_type(udev, |
| 2204 | hub, port1, status, portchange, portstatus); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2205 | if (status == 0) |
| 2206 | status = finish_port_resume(udev); |
| 2207 | if (status < 0) { |
| 2208 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| 2209 | hub_port_logical_disconnect(hub, port1); |
| 2210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | return status; |
| 2212 | } |
| 2213 | |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2214 | /* caller has locked udev */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | static int remote_wakeup(struct usb_device *udev) |
| 2216 | { |
| 2217 | int status = 0; |
| 2218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | if (udev->state == USB_STATE_SUSPENDED) { |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 2220 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
Alan Stern | 1941044 | 2007-03-27 13:33:59 -0400 | [diff] [blame] | 2221 | usb_mark_last_busy(udev); |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2222 | status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); |
Alan Stern | d25450c | 2006-11-20 11:14:30 -0500 | [diff] [blame] | 2223 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | return status; |
| 2225 | } |
| 2226 | |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2227 | #else /* CONFIG_USB_SUSPEND */ |
| 2228 | |
| 2229 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ |
| 2230 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2231 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2232 | { |
| 2233 | return 0; |
| 2234 | } |
| 2235 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2236 | /* However we may need to do a reset-resume */ |
| 2237 | |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2238 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2239 | { |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2240 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
| 2241 | int port1 = udev->portnum; |
| 2242 | int status; |
| 2243 | u16 portchange, portstatus; |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2244 | |
Alan Stern | b01b03f | 2008-04-28 11:06:11 -0400 | [diff] [blame] | 2245 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2246 | status = check_port_resume_type(udev, |
| 2247 | hub, port1, status, portchange, portstatus); |
| 2248 | |
| 2249 | if (status) { |
| 2250 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
| 2251 | hub_port_logical_disconnect(hub, port1); |
| 2252 | } else if (udev->reset_resume) { |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2253 | dev_dbg(&udev->dev, "reset-resume\n"); |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 2254 | status = usb_reset_and_verify_device(udev); |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2255 | } |
| 2256 | return status; |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2257 | } |
| 2258 | |
| 2259 | static inline int remote_wakeup(struct usb_device *udev) |
| 2260 | { |
| 2261 | return 0; |
| 2262 | } |
| 2263 | |
| 2264 | #endif |
| 2265 | |
David Brownell | db69087 | 2005-09-13 19:56:33 -0700 | [diff] [blame] | 2266 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | { |
| 2268 | struct usb_hub *hub = usb_get_intfdata (intf); |
| 2269 | struct usb_device *hdev = hub->hdev; |
| 2270 | unsigned port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 2272 | /* fail if children aren't already suspended */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| 2274 | struct usb_device *udev; |
| 2275 | |
| 2276 | udev = hdev->children [port1-1]; |
Alan Stern | 6840d25 | 2007-09-10 11:34:26 -0400 | [diff] [blame] | 2277 | if (udev && udev->can_submit) { |
Alan Stern | 65bfd29 | 2008-11-25 16:39:18 -0500 | [diff] [blame] | 2278 | if (!(msg.event & PM_EVENT_AUTO)) |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 2279 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
| 2280 | port1); |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 2281 | return -EBUSY; |
| 2282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | } |
| 2284 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 2285 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 2286 | |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 2287 | /* stop khubd and related activity */ |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 2288 | hub_quiesce(hub, HUB_SUSPEND); |
Alan Stern | b6f6436 | 2007-05-04 11:51:54 -0400 | [diff] [blame] | 2289 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
| 2292 | static int hub_resume(struct usb_interface *intf) |
| 2293 | { |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 2294 | struct usb_hub *hub = usb_get_intfdata(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 2296 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 2297 | hub_activate(hub, HUB_RESUME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | return 0; |
| 2299 | } |
| 2300 | |
Alan Stern | b41a60e | 2007-05-30 15:39:33 -0400 | [diff] [blame] | 2301 | static int hub_reset_resume(struct usb_interface *intf) |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 2302 | { |
Alan Stern | b41a60e | 2007-05-30 15:39:33 -0400 | [diff] [blame] | 2303 | struct usb_hub *hub = usb_get_intfdata(intf); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 2304 | |
Alan Stern | 5e6effa | 2008-03-03 15:15:51 -0500 | [diff] [blame] | 2305 | dev_dbg(&intf->dev, "%s\n", __func__); |
Alan Stern | f283521 | 2008-04-28 11:07:17 -0400 | [diff] [blame] | 2306 | hub_activate(hub, HUB_RESET_RESUME); |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 2307 | return 0; |
| 2308 | } |
| 2309 | |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2310 | /** |
| 2311 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
| 2312 | * @rhdev: struct usb_device for the root hub |
| 2313 | * |
| 2314 | * The USB host controller driver calls this function when its root hub |
| 2315 | * is resumed and Vbus power has been interrupted or the controller |
Alan Stern | feccc30 | 2008-03-03 15:15:59 -0500 | [diff] [blame] | 2316 | * has been reset. The routine marks @rhdev as having lost power. |
| 2317 | * When the hub driver is resumed it will take notice and carry out |
| 2318 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; |
| 2319 | * the others will be disconnected. |
Alan Stern | 54515fe | 2007-05-30 15:38:58 -0400 | [diff] [blame] | 2320 | */ |
| 2321 | void usb_root_hub_lost_power(struct usb_device *rhdev) |
| 2322 | { |
| 2323 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); |
| 2324 | rhdev->reset_resume = 1; |
| 2325 | } |
| 2326 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
| 2327 | |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2328 | #else /* CONFIG_PM */ |
| 2329 | |
| 2330 | static inline int remote_wakeup(struct usb_device *udev) |
| 2331 | { |
| 2332 | return 0; |
| 2333 | } |
| 2334 | |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 2335 | #define hub_suspend NULL |
| 2336 | #define hub_resume NULL |
| 2337 | #define hub_reset_resume NULL |
Alan Stern | d388dab | 2006-07-01 22:14:24 -0400 | [diff] [blame] | 2338 | #endif |
| 2339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | |
| 2341 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
| 2342 | * |
| 2343 | * Between connect detection and reset signaling there must be a delay |
| 2344 | * of 100ms at least for debounce and power-settling. The corresponding |
| 2345 | * timer shall restart whenever the downstream port detects a disconnect. |
| 2346 | * |
| 2347 | * Apparently there are some bluetooth and irda-dongles and a number of |
| 2348 | * low-speed devices for which this debounce period may last over a second. |
| 2349 | * Not covered by the spec - but easy to deal with. |
| 2350 | * |
| 2351 | * This implementation uses a 1500ms total debounce timeout; if the |
| 2352 | * connection isn't stable by then it returns -ETIMEDOUT. It checks |
| 2353 | * every 25ms for transient disconnects. When the port status has been |
| 2354 | * unchanged for 100ms it returns the port status. |
| 2355 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
| 2357 | { |
| 2358 | int ret; |
| 2359 | int total_time, stable_time = 0; |
| 2360 | u16 portchange, portstatus; |
| 2361 | unsigned connection = 0xffff; |
| 2362 | |
| 2363 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| 2364 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2365 | if (ret < 0) |
| 2366 | return ret; |
| 2367 | |
| 2368 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
| 2369 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
| 2370 | stable_time += HUB_DEBOUNCE_STEP; |
| 2371 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
| 2372 | break; |
| 2373 | } else { |
| 2374 | stable_time = 0; |
| 2375 | connection = portstatus & USB_PORT_STAT_CONNECTION; |
| 2376 | } |
| 2377 | |
| 2378 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 2379 | clear_port_feature(hub->hdev, port1, |
| 2380 | USB_PORT_FEAT_C_CONNECTION); |
| 2381 | } |
| 2382 | |
| 2383 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| 2384 | break; |
| 2385 | msleep(HUB_DEBOUNCE_STEP); |
| 2386 | } |
| 2387 | |
| 2388 | dev_dbg (hub->intfdev, |
| 2389 | "debounce: port %d: total %dms stable %dms status 0x%x\n", |
| 2390 | port1, total_time, stable_time, portstatus); |
| 2391 | |
| 2392 | if (stable_time < HUB_DEBOUNCE_STABLE) |
| 2393 | return -ETIMEDOUT; |
| 2394 | return portstatus; |
| 2395 | } |
| 2396 | |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2397 | void usb_ep0_reinit(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | { |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 2399 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
| 2400 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 2401 | usb_enable_endpoint(udev, &udev->ep0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | } |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2403 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | |
| 2405 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
| 2406 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
| 2407 | |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 2408 | static int hub_set_address(struct usb_device *udev, int devnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2409 | { |
| 2410 | int retval; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2411 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2413 | /* |
| 2414 | * The host controller will choose the device address, |
| 2415 | * instead of the core having chosen it earlier |
| 2416 | */ |
| 2417 | if (!hcd->driver->address_device && devnum <= 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | return -EINVAL; |
| 2419 | if (udev->state == USB_STATE_ADDRESS) |
| 2420 | return 0; |
| 2421 | if (udev->state != USB_STATE_DEFAULT) |
| 2422 | return -EINVAL; |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2423 | if (hcd->driver->address_device) { |
| 2424 | retval = hcd->driver->address_device(hcd, udev); |
| 2425 | } else { |
| 2426 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
| 2427 | USB_REQ_SET_ADDRESS, 0, devnum, 0, |
| 2428 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 2429 | if (retval == 0) |
| 2430 | update_address(udev, devnum); |
| 2431 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | if (retval == 0) { |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2433 | /* Device now using proper address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2435 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | } |
| 2437 | return retval; |
| 2438 | } |
| 2439 | |
| 2440 | /* Reset device, (re)assign address, get device descriptor. |
| 2441 | * Device connection must be stable, no more debouncing needed. |
| 2442 | * Returns device in USB_STATE_ADDRESS, except on error. |
| 2443 | * |
| 2444 | * If this is called for an already-existing device (as part of |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 2445 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | * newly detected device that is not accessible through any global |
| 2447 | * pointers, it's not necessary to lock the device. |
| 2448 | */ |
| 2449 | static int |
| 2450 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, |
| 2451 | int retry_counter) |
| 2452 | { |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2453 | static DEFINE_MUTEX(usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | |
| 2455 | struct usb_device *hdev = hub->hdev; |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 2456 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | int i, j, retval; |
| 2458 | unsigned delay = HUB_SHORT_RESET_TIME; |
| 2459 | enum usb_device_speed oldspeed = udev->speed; |
Inaky Perez-Gonzalez | 83a0719 | 2006-08-25 19:35:31 -0700 | [diff] [blame] | 2460 | char *speed, *type; |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 2461 | int devnum = udev->devnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | |
| 2463 | /* root hub ports have a slightly longer reset period |
| 2464 | * (from USB 2.0 spec, section 7.1.7.5) |
| 2465 | */ |
| 2466 | if (!hdev->parent) { |
| 2467 | delay = HUB_ROOT_RESET_TIME; |
| 2468 | if (port1 == hdev->bus->otg_port) |
| 2469 | hdev->bus->b_hnp_enable = 0; |
| 2470 | } |
| 2471 | |
| 2472 | /* Some low speed devices have problems with the quick delay, so */ |
| 2473 | /* be a bit pessimistic with those devices. RHbug #23670 */ |
| 2474 | if (oldspeed == USB_SPEED_LOW) |
| 2475 | delay = HUB_LONG_RESET_TIME; |
| 2476 | |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2477 | mutex_lock(&usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 2479 | if ((hcd->driver->flags & HCD_USB3) && udev->config) { |
| 2480 | /* FIXME this will need special handling by the xHCI driver. */ |
| 2481 | dev_dbg(&udev->dev, |
| 2482 | "xHCI reset of configured device " |
| 2483 | "not supported yet.\n"); |
| 2484 | retval = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | goto fail; |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 2486 | } else if (!udev->config && oldspeed == USB_SPEED_SUPER) { |
| 2487 | /* Don't reset USB 3.0 devices during an initial setup */ |
| 2488 | usb_set_device_state(udev, USB_STATE_DEFAULT); |
| 2489 | } else { |
| 2490 | /* Reset the device; full speed may morph to high speed */ |
| 2491 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ |
| 2492 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2493 | if (retval < 0) /* error or disconnect */ |
| 2494 | goto fail; |
| 2495 | /* success, speed is known */ |
| 2496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | retval = -ENODEV; |
| 2498 | |
| 2499 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { |
| 2500 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
| 2501 | goto fail; |
| 2502 | } |
| 2503 | oldspeed = udev->speed; |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 2504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| 2506 | * it's fixed size except for full speed devices. |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 2507 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
| 2508 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | */ |
| 2510 | switch (udev->speed) { |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 2511 | case USB_SPEED_SUPER: |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 2512 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 2513 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 2514 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | case USB_SPEED_HIGH: /* fixed at 64 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 2516 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | break; |
| 2518 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| 2519 | /* to determine the ep0 maxpacket size, try to read |
| 2520 | * the device descriptor to get bMaxPacketSize0 and |
| 2521 | * then correct our initial guess. |
| 2522 | */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 2523 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | break; |
| 2525 | case USB_SPEED_LOW: /* fixed at 8 */ |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 2526 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | break; |
| 2528 | default: |
| 2529 | goto fail; |
| 2530 | } |
| 2531 | |
Inaky Perez-Gonzalez | 83a0719 | 2006-08-25 19:35:31 -0700 | [diff] [blame] | 2532 | type = ""; |
| 2533 | switch (udev->speed) { |
| 2534 | case USB_SPEED_LOW: speed = "low"; break; |
| 2535 | case USB_SPEED_FULL: speed = "full"; break; |
| 2536 | case USB_SPEED_HIGH: speed = "high"; break; |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 2537 | case USB_SPEED_SUPER: |
| 2538 | speed = "super"; |
| 2539 | break; |
Inaky Perez-Gonzalez | 83a0719 | 2006-08-25 19:35:31 -0700 | [diff] [blame] | 2540 | case USB_SPEED_VARIABLE: |
| 2541 | speed = "variable"; |
| 2542 | type = "Wireless "; |
| 2543 | break; |
| 2544 | default: speed = "?"; break; |
| 2545 | } |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2546 | if (udev->speed != USB_SPEED_SUPER) |
| 2547 | dev_info(&udev->dev, |
| 2548 | "%s %s speed %sUSB device using %s and address %d\n", |
| 2549 | (udev->config) ? "reset" : "new", speed, type, |
| 2550 | udev->bus->controller->driver->name, devnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | |
| 2552 | /* Set up TT records, if needed */ |
| 2553 | if (hdev->tt) { |
| 2554 | udev->tt = hdev->tt; |
| 2555 | udev->ttport = hdev->ttport; |
| 2556 | } else if (udev->speed != USB_SPEED_HIGH |
| 2557 | && hdev->speed == USB_SPEED_HIGH) { |
| 2558 | udev->tt = &hub->tt; |
| 2559 | udev->ttport = port1; |
| 2560 | } |
| 2561 | |
| 2562 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
| 2563 | * Because device hardware and firmware is sometimes buggy in |
| 2564 | * this area, and this is how Linux has done it for ages. |
| 2565 | * Change it cautiously. |
| 2566 | * |
| 2567 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing |
| 2568 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
| 2569 | * so it may help with some non-standards-compliant devices. |
| 2570 | * Otherwise we start with SET_ADDRESS and then try to read the |
| 2571 | * first 8 bytes of the device descriptor to get the ep0 maxpacket |
| 2572 | * value. |
| 2573 | */ |
| 2574 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2575 | /* |
| 2576 | * An xHCI controller cannot send any packets to a device until |
| 2577 | * a set address command successfully completes. |
| 2578 | */ |
| 2579 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | struct usb_device_descriptor *buf; |
| 2581 | int r = 0; |
| 2582 | |
| 2583 | #define GET_DESCRIPTOR_BUFSIZE 64 |
| 2584 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
| 2585 | if (!buf) { |
| 2586 | retval = -ENOMEM; |
| 2587 | continue; |
| 2588 | } |
| 2589 | |
Alan Stern | b89ee19 | 2007-05-11 10:19:04 -0400 | [diff] [blame] | 2590 | /* Retry on all errors; some devices are flakey. |
| 2591 | * 255 is for WUSB devices, we actually need to use |
| 2592 | * 512 (WUSB1.0[4.8.1]). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | */ |
| 2594 | for (j = 0; j < 3; ++j) { |
| 2595 | buf->bMaxPacketSize0 = 0; |
| 2596 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
| 2597 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 2598 | USB_DT_DEVICE << 8, 0, |
| 2599 | buf, GET_DESCRIPTOR_BUFSIZE, |
Jaroslav Kysela | fd7c519 | 2008-10-10 16:24:45 +0200 | [diff] [blame] | 2600 | initial_descriptor_timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | switch (buf->bMaxPacketSize0) { |
Inaky Perez-Gonzalez | 5bb6e0a | 2006-08-25 19:35:30 -0700 | [diff] [blame] | 2602 | case 8: case 16: case 32: case 64: case 255: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | if (buf->bDescriptorType == |
| 2604 | USB_DT_DEVICE) { |
| 2605 | r = 0; |
| 2606 | break; |
| 2607 | } |
| 2608 | /* FALL THROUGH */ |
| 2609 | default: |
| 2610 | if (r == 0) |
| 2611 | r = -EPROTO; |
| 2612 | break; |
| 2613 | } |
| 2614 | if (r == 0) |
| 2615 | break; |
| 2616 | } |
| 2617 | udev->descriptor.bMaxPacketSize0 = |
| 2618 | buf->bMaxPacketSize0; |
| 2619 | kfree(buf); |
| 2620 | |
| 2621 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2622 | if (retval < 0) /* error or disconnect */ |
| 2623 | goto fail; |
| 2624 | if (oldspeed != udev->speed) { |
| 2625 | dev_dbg(&udev->dev, |
| 2626 | "device reset changed speed!\n"); |
| 2627 | retval = -ENODEV; |
| 2628 | goto fail; |
| 2629 | } |
| 2630 | if (r) { |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2631 | dev_err(&udev->dev, |
| 2632 | "device descriptor read/64, error %d\n", |
| 2633 | r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2634 | retval = -EMSGSIZE; |
| 2635 | continue; |
| 2636 | } |
| 2637 | #undef GET_DESCRIPTOR_BUFSIZE |
| 2638 | } |
| 2639 | |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2640 | /* |
| 2641 | * If device is WUSB, we already assigned an |
| 2642 | * unauthorized address in the Connect Ack sequence; |
| 2643 | * authorization will assign the final address. |
| 2644 | */ |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2645 | if (udev->wusb == 0) { |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2646 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
| 2647 | retval = hub_set_address(udev, devnum); |
| 2648 | if (retval >= 0) |
| 2649 | break; |
| 2650 | msleep(200); |
| 2651 | } |
| 2652 | if (retval < 0) { |
| 2653 | dev_err(&udev->dev, |
| 2654 | "device not accepting address %d, error %d\n", |
| 2655 | devnum, retval); |
| 2656 | goto fail; |
| 2657 | } |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2658 | if (udev->speed == USB_SPEED_SUPER) { |
| 2659 | devnum = udev->devnum; |
| 2660 | dev_info(&udev->dev, |
| 2661 | "%s SuperSpeed USB device using %s and address %d\n", |
| 2662 | (udev->config) ? "reset" : "new", |
| 2663 | udev->bus->controller->driver->name, devnum); |
| 2664 | } |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2665 | |
| 2666 | /* cope with hardware quirkiness: |
| 2667 | * - let SET_ADDRESS settle, some device hardware wants it |
| 2668 | * - read ep0 maxpacket even for high and low speed, |
| 2669 | */ |
| 2670 | msleep(10); |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2671 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | break; |
Inaky Perez-Gonzalez | 6c529cd | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2673 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | |
| 2675 | retval = usb_get_device_descriptor(udev, 8); |
| 2676 | if (retval < 8) { |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2677 | dev_err(&udev->dev, |
| 2678 | "device descriptor read/8, error %d\n", |
| 2679 | retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2680 | if (retval >= 0) |
| 2681 | retval = -EMSGSIZE; |
| 2682 | } else { |
| 2683 | retval = 0; |
| 2684 | break; |
| 2685 | } |
| 2686 | } |
| 2687 | if (retval) |
| 2688 | goto fail; |
| 2689 | |
Sarah Sharp | 6b403b0 | 2009-04-27 19:54:10 -0700 | [diff] [blame] | 2690 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
| 2691 | udev->speed == USB_SPEED_SUPER) |
| 2692 | i = 512; |
| 2693 | else |
| 2694 | i = udev->descriptor.bMaxPacketSize0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
| 2696 | if (udev->speed != USB_SPEED_FULL || |
| 2697 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
| 2698 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 2699 | retval = -EMSGSIZE; |
| 2700 | goto fail; |
| 2701 | } |
| 2702 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 2703 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2704 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2705 | } |
| 2706 | |
| 2707 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
| 2708 | if (retval < (signed)sizeof(udev->descriptor)) { |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2709 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
| 2710 | retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | if (retval >= 0) |
| 2712 | retval = -ENOMSG; |
| 2713 | goto fail; |
| 2714 | } |
| 2715 | |
| 2716 | retval = 0; |
| 2717 | |
| 2718 | fail: |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 2719 | if (retval) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | hub_port_disable(hub, port1, 0); |
David Vrabel | 4953d14 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2721 | update_address(udev, devnum); /* for disconnect processing */ |
Alan Stern | 4326ed0 | 2007-07-30 17:08:43 -0400 | [diff] [blame] | 2722 | } |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2723 | mutex_unlock(&usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | return retval; |
| 2725 | } |
| 2726 | |
| 2727 | static void |
| 2728 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) |
| 2729 | { |
| 2730 | struct usb_qualifier_descriptor *qual; |
| 2731 | int status; |
| 2732 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 2733 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2734 | if (qual == NULL) |
| 2735 | return; |
| 2736 | |
| 2737 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, |
| 2738 | qual, sizeof *qual); |
| 2739 | if (status == sizeof *qual) { |
| 2740 | dev_info(&udev->dev, "not running at top speed; " |
| 2741 | "connect to a high speed hub\n"); |
| 2742 | /* hub LEDs are probably harder to miss than syslog */ |
| 2743 | if (hub->has_indicators) { |
| 2744 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2745 | schedule_delayed_work (&hub->leds, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | } |
| 2747 | } |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 2748 | kfree(qual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | } |
| 2750 | |
| 2751 | static unsigned |
| 2752 | hub_power_remaining (struct usb_hub *hub) |
| 2753 | { |
| 2754 | struct usb_device *hdev = hub->hdev; |
| 2755 | int remaining; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2756 | int port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2757 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2758 | if (!hub->limited_power) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | return 0; |
| 2760 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2761 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
| 2762 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 2763 | struct usb_device *udev = hdev->children[port1 - 1]; |
| 2764 | int delta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | |
| 2766 | if (!udev) |
| 2767 | continue; |
| 2768 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2769 | /* Unconfigured devices may not use more than 100mA, |
| 2770 | * or 8mA for OTG ports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | if (udev->actconfig) |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2772 | delta = udev->actconfig->desc.bMaxPower * 2; |
| 2773 | else if (port1 != udev->bus->otg_port || hdev->parent) |
| 2774 | delta = 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2775 | else |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2776 | delta = 8; |
| 2777 | if (delta > hub->mA_per_port) |
Wu Fengguang | b9cef6c | 2008-12-15 15:32:01 +0800 | [diff] [blame] | 2778 | dev_warn(&udev->dev, |
| 2779 | "%dmA is over %umA budget for port %d!\n", |
| 2780 | delta, hub->mA_per_port, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | remaining -= delta; |
| 2782 | } |
| 2783 | if (remaining < 0) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2784 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
| 2785 | - remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | remaining = 0; |
| 2787 | } |
| 2788 | return remaining; |
| 2789 | } |
| 2790 | |
| 2791 | /* Handle physical or logical connection change events. |
| 2792 | * This routine is called when: |
| 2793 | * a port connection-change occurs; |
| 2794 | * a port enable-change occurs (often caused by EMI); |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 2795 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | * a firmware download) |
| 2797 | * caller already locked the hub |
| 2798 | */ |
| 2799 | static void hub_port_connect_change(struct usb_hub *hub, int port1, |
| 2800 | u16 portstatus, u16 portchange) |
| 2801 | { |
| 2802 | struct usb_device *hdev = hub->hdev; |
| 2803 | struct device *hub_dev = hub->intfdev; |
Balaji Rao | 90da096 | 2007-11-22 01:58:14 +0530 | [diff] [blame] | 2804 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2805 | unsigned wHubCharacteristics = |
| 2806 | le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2807 | struct usb_device *udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | int status, i; |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | dev_dbg (hub_dev, |
| 2811 | "port %d, status %04x, change %04x, %s\n", |
| 2812 | port1, portstatus, portchange, portspeed (portstatus)); |
| 2813 | |
| 2814 | if (hub->has_indicators) { |
| 2815 | set_port_led(hub, port1, HUB_LED_AUTO); |
| 2816 | hub->indicator[port1-1] = INDICATOR_AUTO; |
| 2817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2818 | |
| 2819 | #ifdef CONFIG_USB_OTG |
| 2820 | /* during HNP, don't repeat the debounce */ |
| 2821 | if (hdev->bus->is_b_host) |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2822 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
| 2823 | USB_PORT_STAT_C_ENABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | #endif |
| 2825 | |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2826 | /* Try to resuscitate an existing device */ |
| 2827 | udev = hdev->children[port1-1]; |
| 2828 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
| 2829 | udev->state != USB_STATE_NOTATTACHED) { |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2830 | usb_lock_device(udev); |
| 2831 | if (portstatus & USB_PORT_STAT_ENABLE) { |
| 2832 | status = 0; /* Nothing to do */ |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2833 | |
| 2834 | #ifdef CONFIG_USB_SUSPEND |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 2835 | } else if (udev->state == USB_STATE_SUSPENDED && |
| 2836 | udev->persist_enabled) { |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2837 | /* For a suspended device, treat this as a |
| 2838 | * remote wakeup event. |
| 2839 | */ |
| 2840 | if (udev->do_remote_wakeup) |
| 2841 | status = remote_wakeup(udev); |
| 2842 | |
| 2843 | /* Otherwise leave it be; devices can't tell the |
| 2844 | * difference between suspended and disabled. |
| 2845 | */ |
| 2846 | else |
| 2847 | status = 0; |
| 2848 | #endif |
| 2849 | |
| 2850 | } else { |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 2851 | status = -ENODEV; /* Don't resuscitate */ |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2852 | } |
| 2853 | usb_unlock_device(udev); |
| 2854 | |
| 2855 | if (status == 0) { |
| 2856 | clear_bit(port1, hub->change_bits); |
| 2857 | return; |
| 2858 | } |
| 2859 | } |
| 2860 | |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2861 | /* Disconnect any existing devices under this port */ |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 2862 | if (udev) |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2863 | usb_disconnect(&hdev->children[port1-1]); |
| 2864 | clear_bit(port1, hub->change_bits); |
| 2865 | |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 2866 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
| 2867 | USB_PORT_STAT_C_ENABLE)) { |
| 2868 | status = hub_port_debounce(hub, port1); |
| 2869 | if (status < 0) { |
| 2870 | if (printk_ratelimit()) |
| 2871 | dev_err(hub_dev, "connect-debounce failed, " |
| 2872 | "port %d disabled\n", port1); |
| 2873 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
| 2874 | } else { |
| 2875 | portstatus = status; |
| 2876 | } |
| 2877 | } |
| 2878 | |
Alan Stern | 24618b0 | 2008-04-28 11:06:28 -0400 | [diff] [blame] | 2879 | /* Return now if debouncing failed or nothing is connected */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
| 2881 | |
| 2882 | /* maybe switch power back on (e.g. root hub was reset) */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2883 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2884 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
| 2885 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
Alan Stern | 5257d97 | 2008-09-22 14:43:08 -0400 | [diff] [blame] | 2886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | if (portstatus & USB_PORT_STAT_ENABLE) |
| 2888 | goto done; |
| 2889 | return; |
| 2890 | } |
| 2891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | |
| 2894 | /* reallocate for each attempt, since references |
| 2895 | * to the previous one can escape in various ways |
| 2896 | */ |
| 2897 | udev = usb_alloc_dev(hdev, hdev->bus, port1); |
| 2898 | if (!udev) { |
| 2899 | dev_err (hub_dev, |
| 2900 | "couldn't allocate port %d usb_device\n", |
| 2901 | port1); |
| 2902 | goto done; |
| 2903 | } |
| 2904 | |
| 2905 | usb_set_device_state(udev, USB_STATE_POWERED); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2906 | udev->bus_mA = hub->mA_per_port; |
Alan Stern | b6956ff | 2006-08-30 15:46:48 -0400 | [diff] [blame] | 2907 | udev->level = hdev->level + 1; |
Inaky Perez-Gonzalez | 8af548d | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 2908 | udev->wusb = hub_is_wusb(hub); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2909 | |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 2910 | /* |
| 2911 | * USB 3.0 devices are reset automatically before the connect |
| 2912 | * port status change appears, and the root hub port status |
| 2913 | * shows the correct speed. We also get port change |
| 2914 | * notifications for USB 3.0 devices from the USB 3.0 portion of |
| 2915 | * an external USB 3.0 hub, but this isn't handled correctly yet |
| 2916 | * FIXME. |
| 2917 | */ |
| 2918 | |
| 2919 | if (!(hcd->driver->flags & HCD_USB3)) |
| 2920 | udev->speed = USB_SPEED_UNKNOWN; |
| 2921 | else if ((hdev->parent == NULL) && |
| 2922 | (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))) |
| 2923 | udev->speed = USB_SPEED_SUPER; |
| 2924 | else |
| 2925 | udev->speed = USB_SPEED_UNKNOWN; |
| 2926 | |
Sarah Sharp | c651527 | 2009-04-27 19:57:26 -0700 | [diff] [blame] | 2927 | /* |
| 2928 | * xHCI needs to issue an address device command later |
| 2929 | * in the hub_port_init sequence for SS/HS/FS/LS devices. |
| 2930 | */ |
| 2931 | if (!(hcd->driver->flags & HCD_USB3)) { |
| 2932 | /* set the address */ |
| 2933 | choose_address(udev); |
| 2934 | if (udev->devnum <= 0) { |
| 2935 | status = -ENOTCONN; /* Don't retry */ |
| 2936 | goto loop; |
| 2937 | } |
| 2938 | } |
| 2939 | |
Sarah Sharp | e7b7717 | 2009-04-27 19:54:26 -0700 | [diff] [blame] | 2940 | /* reset (non-USB 3.0 devices) and get descriptor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | status = hub_port_init(hub, udev, port1, i); |
| 2942 | if (status < 0) |
| 2943 | goto loop; |
| 2944 | |
| 2945 | /* consecutive bus-powered hubs aren't reliable; they can |
| 2946 | * violate the voltage drop budget. if the new child has |
| 2947 | * a "powered" LED, users should notice we didn't enable it |
| 2948 | * (without reading syslog), even without per-port LEDs |
| 2949 | * on the parent. |
| 2950 | */ |
| 2951 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2952 | && udev->bus_mA <= 100) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2953 | u16 devstat; |
| 2954 | |
| 2955 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, |
| 2956 | &devstat); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2957 | if (status < 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
| 2959 | goto loop_disable; |
| 2960 | } |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2961 | le16_to_cpus(&devstat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2962 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| 2963 | dev_err(&udev->dev, |
| 2964 | "can't connect bus-powered hub " |
| 2965 | "to this port\n"); |
| 2966 | if (hub->has_indicators) { |
| 2967 | hub->indicator[port1-1] = |
| 2968 | INDICATOR_AMBER_BLINK; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2969 | schedule_delayed_work (&hub->leds, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | } |
| 2971 | status = -ENOTCONN; /* Don't retry */ |
| 2972 | goto loop_disable; |
| 2973 | } |
| 2974 | } |
| 2975 | |
| 2976 | /* check for devices running slower than they could */ |
| 2977 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
| 2978 | && udev->speed == USB_SPEED_FULL |
| 2979 | && highspeed_hubs != 0) |
| 2980 | check_highspeed (hub, udev, port1); |
| 2981 | |
| 2982 | /* Store the parent's children[] pointer. At this point |
| 2983 | * udev becomes globally accessible, although presumably |
| 2984 | * no one will look at it until hdev is unlocked. |
| 2985 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2986 | status = 0; |
| 2987 | |
| 2988 | /* We mustn't add new devices if the parent hub has |
| 2989 | * been disconnected; we would race with the |
| 2990 | * recursively_mark_NOTATTACHED() routine. |
| 2991 | */ |
| 2992 | spin_lock_irq(&device_state_lock); |
| 2993 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 2994 | status = -ENOTCONN; |
| 2995 | else |
| 2996 | hdev->children[port1-1] = udev; |
| 2997 | spin_unlock_irq(&device_state_lock); |
| 2998 | |
| 2999 | /* Run it through the hoops (find a driver, etc) */ |
| 3000 | if (!status) { |
| 3001 | status = usb_new_device(udev); |
| 3002 | if (status) { |
| 3003 | spin_lock_irq(&device_state_lock); |
| 3004 | hdev->children[port1-1] = NULL; |
| 3005 | spin_unlock_irq(&device_state_lock); |
| 3006 | } |
| 3007 | } |
| 3008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3009 | if (status) |
| 3010 | goto loop_disable; |
| 3011 | |
| 3012 | status = hub_power_remaining(hub); |
| 3013 | if (status) |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 3014 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | |
| 3016 | return; |
| 3017 | |
| 3018 | loop_disable: |
| 3019 | hub_port_disable(hub, port1, 1); |
| 3020 | loop: |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 3021 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3022 | release_address(udev); |
| 3023 | usb_put_dev(udev); |
Vikram Pandita | ffcdc18 | 2007-05-25 21:31:07 -0700 | [diff] [blame] | 3024 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | break; |
| 3026 | } |
Alan Stern | 3a31155 | 2008-05-20 16:58:29 -0400 | [diff] [blame] | 3027 | if (hub->hdev->parent || |
| 3028 | !hcd->driver->port_handed_over || |
| 3029 | !(hcd->driver->port_handed_over)(hcd, port1)) |
| 3030 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", |
| 3031 | port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | |
| 3033 | done: |
| 3034 | hub_port_disable(hub, port1, 1); |
Balaji Rao | 90da096 | 2007-11-22 01:58:14 +0530 | [diff] [blame] | 3035 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
| 3036 | hcd->driver->relinquish_port(hcd, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | } |
| 3038 | |
| 3039 | static void hub_events(void) |
| 3040 | { |
| 3041 | struct list_head *tmp; |
| 3042 | struct usb_device *hdev; |
| 3043 | struct usb_interface *intf; |
| 3044 | struct usb_hub *hub; |
| 3045 | struct device *hub_dev; |
| 3046 | u16 hubstatus; |
| 3047 | u16 hubchange; |
| 3048 | u16 portstatus; |
| 3049 | u16 portchange; |
| 3050 | int i, ret; |
| 3051 | int connect_change; |
| 3052 | |
| 3053 | /* |
| 3054 | * We restart the list every time to avoid a deadlock with |
| 3055 | * deleting hubs downstream from this one. This should be |
| 3056 | * safe since we delete the hub from the event list. |
| 3057 | * Not the most efficient, but avoids deadlocks. |
| 3058 | */ |
| 3059 | while (1) { |
| 3060 | |
| 3061 | /* Grab the first entry at the beginning of the list */ |
| 3062 | spin_lock_irq(&hub_event_lock); |
| 3063 | if (list_empty(&hub_event_list)) { |
| 3064 | spin_unlock_irq(&hub_event_lock); |
| 3065 | break; |
| 3066 | } |
| 3067 | |
| 3068 | tmp = hub_event_list.next; |
| 3069 | list_del_init(tmp); |
| 3070 | |
| 3071 | hub = list_entry(tmp, struct usb_hub, event_list); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 3072 | kref_get(&hub->kref); |
| 3073 | spin_unlock_irq(&hub_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3074 | |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 3075 | hdev = hub->hdev; |
| 3076 | hub_dev = hub->intfdev; |
| 3077 | intf = to_usb_interface(hub_dev); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3078 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | hdev->state, hub->descriptor |
| 3080 | ? hub->descriptor->bNbrPorts |
| 3081 | : 0, |
| 3082 | /* NOTE: expects max 15 ports... */ |
| 3083 | (u16) hub->change_bits[0], |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3084 | (u16) hub->event_bits[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3085 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3086 | /* Lock the device, then check to see if we were |
| 3087 | * disconnected while waiting for the lock to succeed. */ |
Alan Stern | 06b84e8 | 2007-05-04 11:54:50 -0400 | [diff] [blame] | 3088 | usb_lock_device(hdev); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 3089 | if (unlikely(hub->disconnected)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | goto loop; |
| 3091 | |
| 3092 | /* If the hub has died, clean up after it */ |
| 3093 | if (hdev->state == USB_STATE_NOTATTACHED) { |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 3094 | hub->error = -ENODEV; |
Alan Stern | 4330354 | 2008-04-28 11:07:31 -0400 | [diff] [blame] | 3095 | hub_quiesce(hub, HUB_DISCONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3096 | goto loop; |
| 3097 | } |
| 3098 | |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3099 | /* Autoresume */ |
| 3100 | ret = usb_autopm_get_interface(intf); |
| 3101 | if (ret) { |
| 3102 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3103 | goto loop; |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3104 | } |
| 3105 | |
| 3106 | /* If this is an inactive hub, do nothing */ |
| 3107 | if (hub->quiescing) |
| 3108 | goto loop_autopm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3109 | |
| 3110 | if (hub->error) { |
| 3111 | dev_dbg (hub_dev, "resetting for error %d\n", |
| 3112 | hub->error); |
| 3113 | |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3114 | ret = usb_reset_device(hdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3115 | if (ret) { |
| 3116 | dev_dbg (hub_dev, |
| 3117 | "error resetting hub: %d\n", ret); |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3118 | goto loop_autopm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | } |
| 3120 | |
| 3121 | hub->nerrors = 0; |
| 3122 | hub->error = 0; |
| 3123 | } |
| 3124 | |
| 3125 | /* deal with port status changes */ |
| 3126 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { |
| 3127 | if (test_bit(i, hub->busy_bits)) |
| 3128 | continue; |
| 3129 | connect_change = test_bit(i, hub->change_bits); |
| 3130 | if (!test_and_clear_bit(i, hub->event_bits) && |
Alan Stern | 6ee0b27 | 2008-04-28 11:06:42 -0400 | [diff] [blame] | 3131 | !connect_change) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | continue; |
| 3133 | |
| 3134 | ret = hub_port_status(hub, i, |
| 3135 | &portstatus, &portchange); |
| 3136 | if (ret < 0) |
| 3137 | continue; |
| 3138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3139 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 3140 | clear_port_feature(hdev, i, |
| 3141 | USB_PORT_FEAT_C_CONNECTION); |
| 3142 | connect_change = 1; |
| 3143 | } |
| 3144 | |
| 3145 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 3146 | if (!connect_change) |
| 3147 | dev_dbg (hub_dev, |
| 3148 | "port %d enable change, " |
| 3149 | "status %08x\n", |
| 3150 | i, portstatus); |
| 3151 | clear_port_feature(hdev, i, |
| 3152 | USB_PORT_FEAT_C_ENABLE); |
| 3153 | |
| 3154 | /* |
| 3155 | * EM interference sometimes causes badly |
| 3156 | * shielded USB devices to be shutdown by |
| 3157 | * the hub, this hack enables them again. |
| 3158 | * Works at least with mouse driver. |
| 3159 | */ |
| 3160 | if (!(portstatus & USB_PORT_STAT_ENABLE) |
| 3161 | && !connect_change |
| 3162 | && hdev->children[i-1]) { |
| 3163 | dev_err (hub_dev, |
| 3164 | "port %i " |
| 3165 | "disabled by hub (EMI?), " |
| 3166 | "re-enabling...\n", |
| 3167 | i); |
| 3168 | connect_change = 1; |
| 3169 | } |
| 3170 | } |
| 3171 | |
| 3172 | if (portchange & USB_PORT_STAT_C_SUSPEND) { |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 3173 | struct usb_device *udev; |
| 3174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3175 | clear_port_feature(hdev, i, |
| 3176 | USB_PORT_FEAT_C_SUSPEND); |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 3177 | udev = hdev->children[i-1]; |
| 3178 | if (udev) { |
| 3179 | usb_lock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | ret = remote_wakeup(hdev-> |
| 3181 | children[i-1]); |
Alan Stern | 8808f00 | 2008-04-28 11:06:55 -0400 | [diff] [blame] | 3182 | usb_unlock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3183 | if (ret < 0) |
| 3184 | connect_change = 1; |
| 3185 | } else { |
| 3186 | ret = -ENODEV; |
| 3187 | hub_port_disable(hub, i, 1); |
| 3188 | } |
| 3189 | dev_dbg (hub_dev, |
| 3190 | "resume on port %d, status %d\n", |
| 3191 | i, ret); |
| 3192 | } |
| 3193 | |
| 3194 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
| 3195 | dev_err (hub_dev, |
| 3196 | "over-current change on port %d\n", |
| 3197 | i); |
| 3198 | clear_port_feature(hdev, i, |
| 3199 | USB_PORT_FEAT_C_OVER_CURRENT); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 3200 | hub_power_on(hub, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3201 | } |
| 3202 | |
| 3203 | if (portchange & USB_PORT_STAT_C_RESET) { |
| 3204 | dev_dbg (hub_dev, |
| 3205 | "reset change on port %d\n", |
| 3206 | i); |
| 3207 | clear_port_feature(hdev, i, |
| 3208 | USB_PORT_FEAT_C_RESET); |
| 3209 | } |
| 3210 | |
| 3211 | if (connect_change) |
| 3212 | hub_port_connect_change(hub, i, |
| 3213 | portstatus, portchange); |
| 3214 | } /* end for i */ |
| 3215 | |
| 3216 | /* deal with hub status changes */ |
| 3217 | if (test_and_clear_bit(0, hub->event_bits) == 0) |
| 3218 | ; /* do nothing */ |
| 3219 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
| 3220 | dev_err (hub_dev, "get_hub_status failed\n"); |
| 3221 | else { |
| 3222 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
| 3223 | dev_dbg (hub_dev, "power change\n"); |
| 3224 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 3225 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 3226 | /* FIXME: Is this always true? */ |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 3227 | hub->limited_power = 1; |
jidong xiao | 403fae7 | 2007-09-14 00:08:51 +0800 | [diff] [blame] | 3228 | else |
| 3229 | hub->limited_power = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3230 | } |
| 3231 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
| 3232 | dev_dbg (hub_dev, "overcurrent change\n"); |
| 3233 | msleep(500); /* Cool down */ |
| 3234 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
Alan Stern | 8520f38 | 2008-09-22 14:44:26 -0400 | [diff] [blame] | 3235 | hub_power_on(hub, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3236 | } |
| 3237 | } |
| 3238 | |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3239 | loop_autopm: |
| 3240 | /* Allow autosuspend if we're not going to run again */ |
| 3241 | if (list_empty(&hub->event_list)) |
| 3242 | usb_autopm_enable(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3243 | loop: |
| 3244 | usb_unlock_device(hdev); |
Alan Stern | e805485 | 2007-05-04 11:55:11 -0400 | [diff] [blame] | 3245 | kref_put(&hub->kref, hub_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3246 | |
| 3247 | } /* end while (1) */ |
| 3248 | } |
| 3249 | |
| 3250 | static int hub_thread(void *__unused) |
| 3251 | { |
Alan Stern | 3bb1af5 | 2008-03-03 15:15:36 -0500 | [diff] [blame] | 3252 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
| 3253 | * port handover. Otherwise it might see that a full-speed device |
| 3254 | * was gone before the EHCI controller had handed its port over to |
| 3255 | * the companion full-speed controller. |
| 3256 | */ |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 3257 | set_freezable(); |
Alan Stern | 3bb1af5 | 2008-03-03 15:15:36 -0500 | [diff] [blame] | 3258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3259 | do { |
| 3260 | hub_events(); |
Rafael J. Wysocki | e42837b | 2007-10-18 03:04:45 -0700 | [diff] [blame] | 3261 | wait_event_freezable(khubd_wait, |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 3262 | !list_empty(&hub_event_list) || |
| 3263 | kthread_should_stop()); |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 3264 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 3266 | pr_debug("%s: khubd exiting\n", usbcore_name); |
| 3267 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3268 | } |
| 3269 | |
| 3270 | static struct usb_device_id hub_id_table [] = { |
| 3271 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
| 3272 | .bDeviceClass = USB_CLASS_HUB}, |
| 3273 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
| 3274 | .bInterfaceClass = USB_CLASS_HUB}, |
| 3275 | { } /* Terminating entry */ |
| 3276 | }; |
| 3277 | |
| 3278 | MODULE_DEVICE_TABLE (usb, hub_id_table); |
| 3279 | |
| 3280 | static struct usb_driver hub_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3281 | .name = "hub", |
| 3282 | .probe = hub_probe, |
| 3283 | .disconnect = hub_disconnect, |
| 3284 | .suspend = hub_suspend, |
| 3285 | .resume = hub_resume, |
Alan Stern | f07600c | 2007-05-30 15:38:16 -0400 | [diff] [blame] | 3286 | .reset_resume = hub_reset_resume, |
Alan Stern | 7de18d8 | 2006-06-01 13:37:24 -0400 | [diff] [blame] | 3287 | .pre_reset = hub_pre_reset, |
| 3288 | .post_reset = hub_post_reset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3289 | .ioctl = hub_ioctl, |
| 3290 | .id_table = hub_id_table, |
Alan Stern | 40f122f | 2006-11-09 14:44:33 -0500 | [diff] [blame] | 3291 | .supports_autosuspend = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3292 | }; |
| 3293 | |
| 3294 | int usb_hub_init(void) |
| 3295 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3296 | if (usb_register(&hub_driver) < 0) { |
| 3297 | printk(KERN_ERR "%s: can't register hub driver\n", |
| 3298 | usbcore_name); |
| 3299 | return -1; |
| 3300 | } |
| 3301 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 3302 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
| 3303 | if (!IS_ERR(khubd_task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3304 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3305 | |
| 3306 | /* Fall through if kernel_thread failed */ |
| 3307 | usb_deregister(&hub_driver); |
| 3308 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); |
| 3309 | |
| 3310 | return -1; |
| 3311 | } |
| 3312 | |
| 3313 | void usb_hub_cleanup(void) |
| 3314 | { |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 3315 | kthread_stop(khubd_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3316 | |
| 3317 | /* |
| 3318 | * Hub resources are freed for us by usb_deregister. It calls |
| 3319 | * usb_driver_purge on every device which in turn calls that |
| 3320 | * devices disconnect function if it is using this driver. |
| 3321 | * The hub_disconnect function takes care of releasing the |
| 3322 | * individual hub resources. -greg |
| 3323 | */ |
| 3324 | usb_deregister(&hub_driver); |
| 3325 | } /* usb_hub_cleanup() */ |
| 3326 | |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3327 | static int descriptors_changed(struct usb_device *udev, |
| 3328 | struct usb_device_descriptor *old_device_descriptor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3329 | { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3330 | int changed = 0; |
| 3331 | unsigned index; |
| 3332 | unsigned serial_len = 0; |
| 3333 | unsigned len; |
| 3334 | unsigned old_length; |
| 3335 | int length; |
| 3336 | char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3337 | |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3338 | if (memcmp(&udev->descriptor, old_device_descriptor, |
| 3339 | sizeof(*old_device_descriptor)) != 0) |
| 3340 | return 1; |
| 3341 | |
| 3342 | /* Since the idVendor, idProduct, and bcdDevice values in the |
| 3343 | * device descriptor haven't changed, we will assume the |
| 3344 | * Manufacturer and Product strings haven't changed either. |
| 3345 | * But the SerialNumber string could be different (e.g., a |
| 3346 | * different flash card of the same brand). |
| 3347 | */ |
| 3348 | if (udev->serial) |
| 3349 | serial_len = strlen(udev->serial) + 1; |
| 3350 | |
| 3351 | len = serial_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3352 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3353 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 3354 | len = max(len, old_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3355 | } |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3356 | |
Oliver Neukum | 0cc1a51 | 2008-01-10 10:31:48 +0100 | [diff] [blame] | 3357 | buf = kmalloc(len, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3358 | if (buf == NULL) { |
| 3359 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); |
| 3360 | /* assume the worst */ |
| 3361 | return 1; |
| 3362 | } |
| 3363 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3364 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3365 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
| 3366 | old_length); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3367 | if (length != old_length) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3368 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
| 3369 | index, length); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3370 | changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3371 | break; |
| 3372 | } |
| 3373 | if (memcmp (buf, udev->rawdescriptors[index], old_length) |
| 3374 | != 0) { |
| 3375 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3376 | index, |
| 3377 | ((struct usb_config_descriptor *) buf)-> |
| 3378 | bConfigurationValue); |
| 3379 | changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3380 | break; |
| 3381 | } |
| 3382 | } |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3383 | |
| 3384 | if (!changed && serial_len) { |
| 3385 | length = usb_string(udev, udev->descriptor.iSerialNumber, |
| 3386 | buf, serial_len); |
| 3387 | if (length + 1 != serial_len) { |
| 3388 | dev_dbg(&udev->dev, "serial string error %d\n", |
| 3389 | length); |
| 3390 | changed = 1; |
| 3391 | } else if (memcmp(buf, udev->serial, length) != 0) { |
| 3392 | dev_dbg(&udev->dev, "serial string changed\n"); |
| 3393 | changed = 1; |
| 3394 | } |
| 3395 | } |
| 3396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3397 | kfree(buf); |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3398 | return changed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3399 | } |
| 3400 | |
| 3401 | /** |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3402 | * 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] | 3403 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 3404 | * |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3405 | * WARNING - don't use this routine to reset a composite device |
| 3406 | * (one with multiple interfaces owned by separate drivers)! |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3407 | * Use usb_reset_device() instead. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3408 | * |
| 3409 | * Do a port reset, reassign the device's address, and establish its |
| 3410 | * former operating configuration. If the reset fails, or the device's |
| 3411 | * descriptors change from their values before the reset, or the original |
| 3412 | * configuration and altsettings cannot be restored, a flag will be set |
| 3413 | * telling khubd to pretend the device has been disconnected and then |
| 3414 | * re-connected. All drivers will be unbound, and the device will be |
| 3415 | * re-enumerated and probed all over again. |
| 3416 | * |
| 3417 | * Returns 0 if the reset succeeded, -ENODEV if the device has been |
| 3418 | * flagged for logical disconnection, or some other negative error code |
| 3419 | * if the reset wasn't even attempted. |
| 3420 | * |
| 3421 | * The caller must own the device lock. For example, it's safe to use |
| 3422 | * this from a driver probe() routine after downloading new firmware. |
| 3423 | * For calls that might not occur during probe(), drivers should lock |
| 3424 | * the device using usb_lock_device_for_reset(). |
Alan Stern | 6bc6cff | 2007-05-04 11:53:03 -0400 | [diff] [blame] | 3425 | * |
| 3426 | * Locking exception: This routine may also be called from within an |
| 3427 | * autoresume handler. Such usage won't conflict with other tasks |
| 3428 | * holding the device lock because these tasks should always call |
| 3429 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3430 | */ |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3431 | static int usb_reset_and_verify_device(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3432 | { |
| 3433 | struct usb_device *parent_hdev = udev->parent; |
| 3434 | struct usb_hub *parent_hub; |
| 3435 | struct usb_device_descriptor descriptor = udev->descriptor; |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 3436 | int i, ret = 0; |
| 3437 | int port1 = udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | |
| 3439 | if (udev->state == USB_STATE_NOTATTACHED || |
| 3440 | udev->state == USB_STATE_SUSPENDED) { |
| 3441 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 3442 | udev->state); |
| 3443 | return -EINVAL; |
| 3444 | } |
| 3445 | |
| 3446 | if (!parent_hdev) { |
| 3447 | /* this requires hcd-specific logic; see OHCI hc_restart() */ |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 3448 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3449 | return -EISDIR; |
| 3450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | parent_hub = hdev_to_hub(parent_hdev); |
| 3452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3453 | set_bit(port1, parent_hub->busy_bits); |
| 3454 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
| 3455 | |
| 3456 | /* ep0 maxpacket size may change; let the HCD know about it. |
| 3457 | * Other endpoints will be handled by re-enumeration. */ |
Inaky Perez-Gonzalez | fc721f5 | 2008-04-08 13:24:46 -0700 | [diff] [blame] | 3458 | usb_ep0_reinit(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3459 | ret = hub_port_init(parent_hub, udev, port1, i); |
Alan Stern | dd4dd19 | 2007-05-04 11:55:54 -0400 | [diff] [blame] | 3460 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3461 | break; |
| 3462 | } |
| 3463 | clear_bit(port1, parent_hub->busy_bits); |
Alan Stern | d5cbad4 | 2006-08-11 16:52:39 -0400 | [diff] [blame] | 3464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3465 | if (ret < 0) |
| 3466 | goto re_enumerate; |
| 3467 | |
| 3468 | /* Device might have changed firmware (DFU or similar) */ |
Alan Stern | eb764c4 | 2008-03-03 15:16:04 -0500 | [diff] [blame] | 3469 | if (descriptors_changed(udev, &descriptor)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3470 | dev_info(&udev->dev, "device firmware changed\n"); |
| 3471 | udev->descriptor = descriptor; /* for disconnect() calls */ |
| 3472 | goto re_enumerate; |
| 3473 | } |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 3474 | |
| 3475 | /* Restore the device's previous configuration */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | if (!udev->actconfig) |
| 3477 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3478 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3479 | USB_REQ_SET_CONFIGURATION, 0, |
| 3480 | udev->actconfig->desc.bConfigurationValue, 0, |
| 3481 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 3482 | if (ret < 0) { |
| 3483 | dev_err(&udev->dev, |
| 3484 | "can't restore configuration #%d (error=%d)\n", |
| 3485 | udev->actconfig->desc.bConfigurationValue, ret); |
| 3486 | goto re_enumerate; |
| 3487 | } |
| 3488 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
| 3489 | |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 3490 | /* Put interfaces back into the same altsettings as before. |
| 3491 | * Don't bother to send the Set-Interface request for interfaces |
| 3492 | * that were already in altsetting 0; besides being unnecessary, |
| 3493 | * many devices can't handle it. Instead just reset the host-side |
| 3494 | * endpoint state. |
| 3495 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3496 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 3497 | struct usb_interface *intf = udev->actconfig->interface[i]; |
| 3498 | struct usb_interface_descriptor *desc; |
| 3499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3500 | desc = &intf->cur_altsetting->desc; |
Alan Stern | 4fe0387 | 2009-02-26 10:21:02 -0500 | [diff] [blame] | 3501 | if (desc->bAlternateSetting == 0) { |
| 3502 | usb_disable_interface(udev, intf, true); |
| 3503 | usb_enable_interface(udev, intf, true); |
| 3504 | ret = 0; |
| 3505 | } else { |
| 3506 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
| 3507 | desc->bAlternateSetting); |
| 3508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3509 | if (ret < 0) { |
| 3510 | dev_err(&udev->dev, "failed to restore interface %d " |
| 3511 | "altsetting %d (error=%d)\n", |
| 3512 | desc->bInterfaceNumber, |
| 3513 | desc->bAlternateSetting, |
| 3514 | ret); |
| 3515 | goto re_enumerate; |
| 3516 | } |
| 3517 | } |
| 3518 | |
| 3519 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3520 | return 0; |
| 3521 | |
| 3522 | re_enumerate: |
| 3523 | hub_port_logical_disconnect(parent_hub, port1); |
| 3524 | return -ENODEV; |
| 3525 | } |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3526 | |
| 3527 | /** |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3528 | * usb_reset_device - warn interface drivers and perform a USB port reset |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3529 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3530 | * |
| 3531 | * Warns all drivers bound to registered interfaces (using their pre_reset |
| 3532 | * method), performs the port reset, and then lets the drivers know that |
| 3533 | * the reset is over (using their post_reset method). |
| 3534 | * |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3535 | * Return value is the same as for usb_reset_and_verify_device(). |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3536 | * |
| 3537 | * The caller must own the device lock. For example, it's safe to use |
| 3538 | * this from a driver probe() routine after downloading new firmware. |
| 3539 | * For calls that might not occur during probe(), drivers should lock |
| 3540 | * the device using usb_lock_device_for_reset(). |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3541 | * |
| 3542 | * If an interface is currently being probed or disconnected, we assume |
| 3543 | * its driver knows how to handle resets. For all other interfaces, |
| 3544 | * if the driver doesn't have pre_reset and post_reset methods then |
| 3545 | * we attempt to unbind it and rebind afterward. |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3546 | */ |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3547 | int usb_reset_device(struct usb_device *udev) |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3548 | { |
| 3549 | int ret; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 3550 | int i; |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3551 | struct usb_host_config *config = udev->actconfig; |
| 3552 | |
| 3553 | if (udev->state == USB_STATE_NOTATTACHED || |
| 3554 | udev->state == USB_STATE_SUSPENDED) { |
| 3555 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 3556 | udev->state); |
| 3557 | return -EINVAL; |
| 3558 | } |
| 3559 | |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 3560 | /* Prevent autosuspend during the reset */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 3561 | usb_autoresume_device(udev); |
Alan Stern | 645daaa | 2006-08-30 15:47:02 -0400 | [diff] [blame] | 3562 | |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3563 | if (config) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3564 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 3565 | struct usb_interface *cintf = config->interface[i]; |
| 3566 | struct usb_driver *drv; |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3567 | int unbind = 0; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 3568 | |
| 3569 | if (cintf->dev.driver) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3570 | drv = to_usb_driver(cintf->dev.driver); |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3571 | if (drv->pre_reset && drv->post_reset) |
| 3572 | unbind = (drv->pre_reset)(cintf); |
| 3573 | else if (cintf->condition == |
| 3574 | USB_INTERFACE_BOUND) |
| 3575 | unbind = 1; |
| 3576 | if (unbind) |
| 3577 | usb_forced_unbind_intf(cintf); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3578 | } |
| 3579 | } |
| 3580 | } |
| 3581 | |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3582 | ret = usb_reset_and_verify_device(udev); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3583 | |
| 3584 | if (config) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3585 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 3586 | struct usb_interface *cintf = config->interface[i]; |
| 3587 | struct usb_driver *drv; |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3588 | int rebind = cintf->needs_binding; |
Alan Stern | 852c4b4 | 2007-12-03 15:44:29 -0500 | [diff] [blame] | 3589 | |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3590 | if (!rebind && cintf->dev.driver) { |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3591 | drv = to_usb_driver(cintf->dev.driver); |
| 3592 | if (drv->post_reset) |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3593 | rebind = (drv->post_reset)(cintf); |
| 3594 | else if (cintf->condition == |
| 3595 | USB_INTERFACE_BOUND) |
| 3596 | rebind = 1; |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3597 | } |
Alan Stern | 6c64094 | 2008-10-21 15:40:03 -0400 | [diff] [blame] | 3598 | if (ret == 0 && rebind) |
Alan Stern | 78d9a48 | 2008-06-23 16:00:40 -0400 | [diff] [blame] | 3599 | usb_rebind_intf(cintf); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3600 | } |
| 3601 | } |
| 3602 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 3603 | usb_autosuspend_device(udev); |
Alan Stern | 79efa09 | 2006-06-01 13:33:42 -0400 | [diff] [blame] | 3604 | return ret; |
| 3605 | } |
Ming Lei | 742120c | 2008-06-18 22:00:29 +0800 | [diff] [blame] | 3606 | EXPORT_SYMBOL_GPL(usb_reset_device); |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 3607 | |
| 3608 | |
| 3609 | /** |
| 3610 | * usb_queue_reset_device - Reset a USB device from an atomic context |
| 3611 | * @iface: USB interface belonging to the device to reset |
| 3612 | * |
| 3613 | * This function can be used to reset a USB device from an atomic |
| 3614 | * context, where usb_reset_device() won't work (as it blocks). |
| 3615 | * |
| 3616 | * Doing a reset via this method is functionally equivalent to calling |
| 3617 | * usb_reset_device(), except for the fact that it is delayed to a |
| 3618 | * workqueue. This means that any drivers bound to other interfaces |
| 3619 | * might be unbound, as well as users from usbfs in user space. |
| 3620 | * |
| 3621 | * Corner cases: |
| 3622 | * |
| 3623 | * - Scheduling two resets at the same time from two different drivers |
| 3624 | * attached to two different interfaces of the same device is |
| 3625 | * possible; depending on how the driver attached to each interface |
| 3626 | * handles ->pre_reset(), the second reset might happen or not. |
| 3627 | * |
| 3628 | * - If a driver is unbound and it had a pending reset, the reset will |
| 3629 | * be cancelled. |
| 3630 | * |
| 3631 | * - This function can be called during .probe() or .disconnect() |
| 3632 | * times. On return from .disconnect(), any pending resets will be |
| 3633 | * cancelled. |
| 3634 | * |
| 3635 | * There is no no need to lock/unlock the @reset_ws as schedule_work() |
| 3636 | * does its own. |
| 3637 | * |
| 3638 | * NOTE: We don't do any reference count tracking because it is not |
| 3639 | * needed. The lifecycle of the work_struct is tied to the |
| 3640 | * usb_interface. Before destroying the interface we cancel the |
| 3641 | * work_struct, so the fact that work_struct is queued and or |
| 3642 | * running means the interface (and thus, the device) exist and |
| 3643 | * are referenced. |
| 3644 | */ |
| 3645 | void usb_queue_reset_device(struct usb_interface *iface) |
| 3646 | { |
| 3647 | schedule_work(&iface->reset_ws); |
| 3648 | } |
| 3649 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |