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 | |
| 11 | #include <linux/config.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/moduleparam.h> |
| 16 | #include <linux/completion.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/smp_lock.h> |
| 21 | #include <linux/ioctl.h> |
| 22 | #include <linux/usb.h> |
| 23 | #include <linux/usbdevice_fs.h> |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 24 | #include <linux/kthread.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 25 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include <asm/semaphore.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/byteorder.h> |
| 30 | |
| 31 | #include "usb.h" |
| 32 | #include "hcd.h" |
| 33 | #include "hub.h" |
| 34 | |
| 35 | /* Protect struct usb_device->state and ->children members |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 36 | * Note: Both are also protected by ->dev.sem, except that ->state can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
| 38 | static DEFINE_SPINLOCK(device_state_lock); |
| 39 | |
| 40 | /* khubd's worklist and its lock */ |
| 41 | static DEFINE_SPINLOCK(hub_event_lock); |
| 42 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ |
| 43 | |
| 44 | /* Wakes up khubd */ |
| 45 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); |
| 46 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 47 | static struct task_struct *khubd_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | /* cycle leds on hubs that aren't blinking for attention */ |
| 50 | static int blinkenlights = 0; |
| 51 | module_param (blinkenlights, bool, S_IRUGO); |
| 52 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); |
| 53 | |
| 54 | /* |
| 55 | * As of 2.6.10 we introduce a new USB device initialization scheme which |
| 56 | * closely resembles the way Windows works. Hopefully it will be compatible |
| 57 | * with a wider range of devices than the old scheme. However some previously |
| 58 | * working devices may start giving rise to "device not accepting address" |
| 59 | * errors; if that happens the user can try the old scheme by adjusting the |
| 60 | * following module parameters. |
| 61 | * |
| 62 | * For maximum flexibility there are two boolean parameters to control the |
| 63 | * hub driver's behavior. On the first initialization attempt, if the |
| 64 | * "old_scheme_first" parameter is set then the old scheme will be used, |
| 65 | * otherwise the new scheme is used. If that fails and "use_both_schemes" |
| 66 | * is set, then the driver will make another attempt, using the other scheme. |
| 67 | */ |
| 68 | static int old_scheme_first = 0; |
| 69 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
| 70 | MODULE_PARM_DESC(old_scheme_first, |
| 71 | "start with the old device initialization scheme"); |
| 72 | |
| 73 | static int use_both_schemes = 1; |
| 74 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
| 75 | MODULE_PARM_DESC(use_both_schemes, |
| 76 | "try the other device initialization scheme if the " |
| 77 | "first one fails"); |
| 78 | |
| 79 | |
| 80 | #ifdef DEBUG |
| 81 | static inline char *portspeed (int portstatus) |
| 82 | { |
| 83 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) |
| 84 | return "480 Mb/s"; |
| 85 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) |
| 86 | return "1.5 Mb/s"; |
| 87 | else |
| 88 | return "12 Mb/s"; |
| 89 | } |
| 90 | #endif |
| 91 | |
| 92 | /* Note that hdev or one of its children must be locked! */ |
| 93 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
| 94 | { |
| 95 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
| 96 | } |
| 97 | |
| 98 | /* USB 2.0 spec Section 11.24.4.5 */ |
| 99 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) |
| 100 | { |
| 101 | int i, ret; |
| 102 | |
| 103 | for (i = 0; i < 3; i++) { |
| 104 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 105 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
| 106 | USB_DT_HUB << 8, 0, data, size, |
| 107 | USB_CTRL_GET_TIMEOUT); |
| 108 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) |
| 109 | return ret; |
| 110 | } |
| 111 | return -EINVAL; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * USB 2.0 spec Section 11.24.2.1 |
| 116 | */ |
| 117 | static int clear_hub_feature(struct usb_device *hdev, int feature) |
| 118 | { |
| 119 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 120 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * USB 2.0 spec Section 11.24.2.2 |
| 125 | */ |
| 126 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) |
| 127 | { |
| 128 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 129 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
| 130 | NULL, 0, 1000); |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * USB 2.0 spec Section 11.24.2.13 |
| 135 | */ |
| 136 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
| 137 | { |
| 138 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
| 139 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
| 140 | NULL, 0, 1000); |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
| 145 | * for info about using port indicators |
| 146 | */ |
| 147 | static void set_port_led( |
| 148 | struct usb_hub *hub, |
| 149 | int port1, |
| 150 | int selector |
| 151 | ) |
| 152 | { |
| 153 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, |
| 154 | USB_PORT_FEAT_INDICATOR); |
| 155 | if (status < 0) |
| 156 | dev_dbg (hub->intfdev, |
| 157 | "port %d indicator %s status %d\n", |
| 158 | port1, |
| 159 | ({ char *s; switch (selector) { |
| 160 | case HUB_LED_AMBER: s = "amber"; break; |
| 161 | case HUB_LED_GREEN: s = "green"; break; |
| 162 | case HUB_LED_OFF: s = "off"; break; |
| 163 | case HUB_LED_AUTO: s = "auto"; break; |
| 164 | default: s = "??"; break; |
| 165 | }; s; }), |
| 166 | status); |
| 167 | } |
| 168 | |
| 169 | #define LED_CYCLE_PERIOD ((2*HZ)/3) |
| 170 | |
| 171 | static void led_work (void *__hub) |
| 172 | { |
| 173 | struct usb_hub *hub = __hub; |
| 174 | struct usb_device *hdev = hub->hdev; |
| 175 | unsigned i; |
| 176 | unsigned changed = 0; |
| 177 | int cursor = -1; |
| 178 | |
| 179 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
| 180 | return; |
| 181 | |
| 182 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { |
| 183 | unsigned selector, mode; |
| 184 | |
| 185 | /* 30%-50% duty cycle */ |
| 186 | |
| 187 | switch (hub->indicator[i]) { |
| 188 | /* cycle marker */ |
| 189 | case INDICATOR_CYCLE: |
| 190 | cursor = i; |
| 191 | selector = HUB_LED_AUTO; |
| 192 | mode = INDICATOR_AUTO; |
| 193 | break; |
| 194 | /* blinking green = sw attention */ |
| 195 | case INDICATOR_GREEN_BLINK: |
| 196 | selector = HUB_LED_GREEN; |
| 197 | mode = INDICATOR_GREEN_BLINK_OFF; |
| 198 | break; |
| 199 | case INDICATOR_GREEN_BLINK_OFF: |
| 200 | selector = HUB_LED_OFF; |
| 201 | mode = INDICATOR_GREEN_BLINK; |
| 202 | break; |
| 203 | /* blinking amber = hw attention */ |
| 204 | case INDICATOR_AMBER_BLINK: |
| 205 | selector = HUB_LED_AMBER; |
| 206 | mode = INDICATOR_AMBER_BLINK_OFF; |
| 207 | break; |
| 208 | case INDICATOR_AMBER_BLINK_OFF: |
| 209 | selector = HUB_LED_OFF; |
| 210 | mode = INDICATOR_AMBER_BLINK; |
| 211 | break; |
| 212 | /* blink green/amber = reserved */ |
| 213 | case INDICATOR_ALT_BLINK: |
| 214 | selector = HUB_LED_GREEN; |
| 215 | mode = INDICATOR_ALT_BLINK_OFF; |
| 216 | break; |
| 217 | case INDICATOR_ALT_BLINK_OFF: |
| 218 | selector = HUB_LED_AMBER; |
| 219 | mode = INDICATOR_ALT_BLINK; |
| 220 | break; |
| 221 | default: |
| 222 | continue; |
| 223 | } |
| 224 | if (selector != HUB_LED_AUTO) |
| 225 | changed = 1; |
| 226 | set_port_led(hub, i + 1, selector); |
| 227 | hub->indicator[i] = mode; |
| 228 | } |
| 229 | if (!changed && blinkenlights) { |
| 230 | cursor++; |
| 231 | cursor %= hub->descriptor->bNbrPorts; |
| 232 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
| 233 | hub->indicator[cursor] = INDICATOR_CYCLE; |
| 234 | changed++; |
| 235 | } |
| 236 | if (changed) |
| 237 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 238 | } |
| 239 | |
| 240 | /* use a short timeout for hub/port status fetches */ |
| 241 | #define USB_STS_TIMEOUT 1000 |
| 242 | #define USB_STS_RETRIES 5 |
| 243 | |
| 244 | /* |
| 245 | * USB 2.0 spec Section 11.24.2.6 |
| 246 | */ |
| 247 | static int get_hub_status(struct usb_device *hdev, |
| 248 | struct usb_hub_status *data) |
| 249 | { |
| 250 | int i, status = -ETIMEDOUT; |
| 251 | |
| 252 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 253 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 254 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
| 255 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 256 | } |
| 257 | return status; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * USB 2.0 spec Section 11.24.2.7 |
| 262 | */ |
| 263 | static int get_port_status(struct usb_device *hdev, int port1, |
| 264 | struct usb_port_status *data) |
| 265 | { |
| 266 | int i, status = -ETIMEDOUT; |
| 267 | |
| 268 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { |
| 269 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 270 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, |
| 271 | data, sizeof(*data), USB_STS_TIMEOUT); |
| 272 | } |
| 273 | return status; |
| 274 | } |
| 275 | |
| 276 | static void kick_khubd(struct usb_hub *hub) |
| 277 | { |
| 278 | unsigned long flags; |
| 279 | |
| 280 | spin_lock_irqsave(&hub_event_lock, flags); |
| 281 | if (list_empty(&hub->event_list)) { |
| 282 | list_add_tail(&hub->event_list, &hub_event_list); |
| 283 | wake_up(&khubd_wait); |
| 284 | } |
| 285 | spin_unlock_irqrestore(&hub_event_lock, flags); |
| 286 | } |
| 287 | |
| 288 | void usb_kick_khubd(struct usb_device *hdev) |
| 289 | { |
| 290 | kick_khubd(hdev_to_hub(hdev)); |
| 291 | } |
| 292 | |
| 293 | |
| 294 | /* completion function, fires on port status changes and various faults */ |
| 295 | static void hub_irq(struct urb *urb, struct pt_regs *regs) |
| 296 | { |
| 297 | struct usb_hub *hub = (struct usb_hub *)urb->context; |
| 298 | int status; |
| 299 | int i; |
| 300 | unsigned long bits; |
| 301 | |
| 302 | switch (urb->status) { |
| 303 | case -ENOENT: /* synchronous unlink */ |
| 304 | case -ECONNRESET: /* async unlink */ |
| 305 | case -ESHUTDOWN: /* hardware going away */ |
| 306 | return; |
| 307 | |
| 308 | default: /* presumably an error */ |
| 309 | /* Cause a hub reset after 10 consecutive errors */ |
| 310 | dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); |
| 311 | if ((++hub->nerrors < 10) || hub->error) |
| 312 | goto resubmit; |
| 313 | hub->error = urb->status; |
| 314 | /* FALL THROUGH */ |
| 315 | |
| 316 | /* let khubd handle things */ |
| 317 | case 0: /* we got data: port status changed */ |
| 318 | bits = 0; |
| 319 | for (i = 0; i < urb->actual_length; ++i) |
| 320 | bits |= ((unsigned long) ((*hub->buffer)[i])) |
| 321 | << (i*8); |
| 322 | hub->event_bits[0] = bits; |
| 323 | break; |
| 324 | } |
| 325 | |
| 326 | hub->nerrors = 0; |
| 327 | |
| 328 | /* Something happened, let khubd figure it out */ |
| 329 | kick_khubd(hub); |
| 330 | |
| 331 | resubmit: |
| 332 | if (hub->quiescing) |
| 333 | return; |
| 334 | |
| 335 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 |
| 336 | && status != -ENODEV && status != -EPERM) |
| 337 | dev_err (hub->intfdev, "resubmit --> %d\n", status); |
| 338 | } |
| 339 | |
| 340 | /* USB 2.0 spec Section 11.24.2.3 */ |
| 341 | static inline int |
| 342 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) |
| 343 | { |
| 344 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
| 345 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
| 346 | tt, NULL, 0, 1000); |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * enumeration blocks khubd for a long time. we use keventd instead, since |
| 351 | * long blocking there is the exception, not the rule. accordingly, HCDs |
| 352 | * talking to TTs must queue control transfers (not just bulk and iso), so |
| 353 | * both can talk to the same hub concurrently. |
| 354 | */ |
| 355 | static void hub_tt_kevent (void *arg) |
| 356 | { |
| 357 | struct usb_hub *hub = arg; |
| 358 | unsigned long flags; |
| 359 | |
| 360 | spin_lock_irqsave (&hub->tt.lock, flags); |
| 361 | while (!list_empty (&hub->tt.clear_list)) { |
| 362 | struct list_head *temp; |
| 363 | struct usb_tt_clear *clear; |
| 364 | struct usb_device *hdev = hub->hdev; |
| 365 | int status; |
| 366 | |
| 367 | temp = hub->tt.clear_list.next; |
| 368 | clear = list_entry (temp, struct usb_tt_clear, clear_list); |
| 369 | list_del (&clear->clear_list); |
| 370 | |
| 371 | /* drop lock so HCD can concurrently report other TT errors */ |
| 372 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 373 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); |
| 374 | spin_lock_irqsave (&hub->tt.lock, flags); |
| 375 | |
| 376 | if (status) |
| 377 | dev_err (&hdev->dev, |
| 378 | "clear tt %d (%04x) error %d\n", |
| 379 | clear->tt, clear->devinfo, status); |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 380 | kfree(clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | } |
| 382 | spin_unlock_irqrestore (&hub->tt.lock, flags); |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub |
| 387 | * @udev: the device whose split transaction failed |
| 388 | * @pipe: identifies the endpoint of the failed transaction |
| 389 | * |
| 390 | * High speed HCDs use this to tell the hub driver that some split control or |
| 391 | * bulk transaction failed in a way that requires clearing internal state of |
| 392 | * a transaction translator. This is normally detected (and reported) from |
| 393 | * interrupt context. |
| 394 | * |
| 395 | * It may not be possible for that hub to handle additional full (or low) |
| 396 | * speed transactions until that state is fully cleared out. |
| 397 | */ |
| 398 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) |
| 399 | { |
| 400 | struct usb_tt *tt = udev->tt; |
| 401 | unsigned long flags; |
| 402 | struct usb_tt_clear *clear; |
| 403 | |
| 404 | /* we've got to cope with an arbitrary number of pending TT clears, |
| 405 | * since each TT has "at least two" buffers that can need it (and |
| 406 | * there can be many TTs per hub). even if they're uncommon. |
| 407 | */ |
| 408 | if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { |
| 409 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
| 410 | /* FIXME recover somehow ... RESET_TT? */ |
| 411 | return; |
| 412 | } |
| 413 | |
| 414 | /* info that CLEAR_TT_BUFFER needs */ |
| 415 | clear->tt = tt->multi ? udev->ttport : 1; |
| 416 | clear->devinfo = usb_pipeendpoint (pipe); |
| 417 | clear->devinfo |= udev->devnum << 4; |
| 418 | clear->devinfo |= usb_pipecontrol (pipe) |
| 419 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
| 420 | : (USB_ENDPOINT_XFER_BULK << 11); |
| 421 | if (usb_pipein (pipe)) |
| 422 | clear->devinfo |= 1 << 15; |
| 423 | |
| 424 | /* tell keventd to clear state for this TT */ |
| 425 | spin_lock_irqsave (&tt->lock, flags); |
| 426 | list_add_tail (&clear->clear_list, &tt->clear_list); |
| 427 | schedule_work (&tt->kevent); |
| 428 | spin_unlock_irqrestore (&tt->lock, flags); |
| 429 | } |
| 430 | |
| 431 | static void hub_power_on(struct usb_hub *hub) |
| 432 | { |
| 433 | int port1; |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 434 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 435 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
| 437 | /* if hub supports power switching, enable power on each port */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 438 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
| 440 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) |
| 441 | set_port_feature(hub->hdev, port1, |
| 442 | USB_PORT_FEAT_POWER); |
| 443 | } |
| 444 | |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 445 | /* Wait at least 100 msec for power to become stable */ |
| 446 | msleep(max(pgood_delay, (unsigned) 100)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 449 | static inline void __hub_quiesce(struct usb_hub *hub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 451 | /* (nonblocking) khubd and related activity won't re-trigger */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | hub->quiescing = 1; |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 453 | hub->activating = 0; |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 454 | hub->resume_root_hub = 0; |
| 455 | } |
| 456 | |
| 457 | static void hub_quiesce(struct usb_hub *hub) |
| 458 | { |
| 459 | /* (blocking) stop khubd and related activity */ |
| 460 | __hub_quiesce(hub); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | usb_kill_urb(hub->urb); |
| 462 | if (hub->has_indicators) |
| 463 | cancel_delayed_work(&hub->leds); |
| 464 | if (hub->has_indicators || hub->tt.hub) |
| 465 | flush_scheduled_work(); |
| 466 | } |
| 467 | |
| 468 | static void hub_activate(struct usb_hub *hub) |
| 469 | { |
| 470 | int status; |
| 471 | |
| 472 | hub->quiescing = 0; |
| 473 | hub->activating = 1; |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 474 | hub->resume_root_hub = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
| 476 | if (status < 0) |
| 477 | dev_err(hub->intfdev, "activate --> %d\n", status); |
| 478 | if (hub->has_indicators && blinkenlights) |
| 479 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); |
| 480 | |
| 481 | /* scan all ports ASAP */ |
| 482 | kick_khubd(hub); |
| 483 | } |
| 484 | |
| 485 | static int hub_hub_status(struct usb_hub *hub, |
| 486 | u16 *status, u16 *change) |
| 487 | { |
| 488 | int ret; |
| 489 | |
| 490 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
| 491 | if (ret < 0) |
| 492 | dev_err (hub->intfdev, |
| 493 | "%s failed (err = %d)\n", __FUNCTION__, ret); |
| 494 | else { |
| 495 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
| 496 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
| 497 | ret = 0; |
| 498 | } |
| 499 | return ret; |
| 500 | } |
| 501 | |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 502 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
| 503 | { |
| 504 | struct usb_device *hdev = hub->hdev; |
| 505 | int ret; |
| 506 | |
| 507 | if (hdev->children[port1-1] && set_state) { |
| 508 | usb_set_device_state(hdev->children[port1-1], |
| 509 | USB_STATE_NOTATTACHED); |
| 510 | } |
| 511 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); |
| 512 | if (ret) |
| 513 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", |
| 514 | port1, ret); |
| 515 | |
| 516 | return ret; |
| 517 | } |
| 518 | |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 519 | |
| 520 | /* caller has locked the hub device */ |
| 521 | static void hub_pre_reset(struct usb_hub *hub, int disable_ports) |
| 522 | { |
| 523 | struct usb_device *hdev = hub->hdev; |
| 524 | int port1; |
| 525 | |
| 526 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 527 | if (hdev->children[port1 - 1]) { |
| 528 | usb_disconnect(&hdev->children[port1 - 1]); |
| 529 | if (disable_ports) |
| 530 | hub_port_disable(hub, port1, 0); |
| 531 | } |
| 532 | } |
| 533 | hub_quiesce(hub); |
| 534 | } |
| 535 | |
| 536 | /* caller has locked the hub device */ |
| 537 | static void hub_post_reset(struct usb_hub *hub) |
| 538 | { |
| 539 | hub_activate(hub); |
| 540 | hub_power_on(hub); |
| 541 | } |
| 542 | |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | static int hub_configure(struct usb_hub *hub, |
| 545 | struct usb_endpoint_descriptor *endpoint) |
| 546 | { |
| 547 | struct usb_device *hdev = hub->hdev; |
| 548 | struct device *hub_dev = hub->intfdev; |
| 549 | u16 hubstatus, hubchange; |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 550 | u16 wHubCharacteristics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | unsigned int pipe; |
| 552 | int maxp, ret; |
| 553 | char *message; |
| 554 | |
| 555 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, |
| 556 | &hub->buffer_dma); |
| 557 | if (!hub->buffer) { |
| 558 | message = "can't allocate hub irq buffer"; |
| 559 | ret = -ENOMEM; |
| 560 | goto fail; |
| 561 | } |
| 562 | |
| 563 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
| 564 | if (!hub->status) { |
| 565 | message = "can't kmalloc hub status buffer"; |
| 566 | ret = -ENOMEM; |
| 567 | goto fail; |
| 568 | } |
| 569 | |
| 570 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
| 571 | if (!hub->descriptor) { |
| 572 | message = "can't kmalloc hub descriptor"; |
| 573 | ret = -ENOMEM; |
| 574 | goto fail; |
| 575 | } |
| 576 | |
| 577 | /* Request the entire hub descriptor. |
| 578 | * hub->descriptor can handle USB_MAXCHILDREN ports, |
| 579 | * but the hub can/will return fewer bytes here. |
| 580 | */ |
| 581 | ret = get_hub_descriptor(hdev, hub->descriptor, |
| 582 | sizeof(*hub->descriptor)); |
| 583 | if (ret < 0) { |
| 584 | message = "can't read hub descriptor"; |
| 585 | goto fail; |
| 586 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { |
| 587 | message = "hub has too many ports!"; |
| 588 | ret = -ENODEV; |
| 589 | goto fail; |
| 590 | } |
| 591 | |
| 592 | hdev->maxchild = hub->descriptor->bNbrPorts; |
| 593 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, |
| 594 | (hdev->maxchild == 1) ? "" : "s"); |
| 595 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 596 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 598 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | int i; |
| 600 | char portstr [USB_MAXCHILDREN + 1]; |
| 601 | |
| 602 | for (i = 0; i < hdev->maxchild; i++) |
| 603 | portstr[i] = hub->descriptor->DeviceRemovable |
| 604 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
| 605 | ? 'F' : 'R'; |
| 606 | portstr[hdev->maxchild] = 0; |
| 607 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
| 608 | } else |
| 609 | dev_dbg(hub_dev, "standalone hub\n"); |
| 610 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 611 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | case 0x00: |
| 613 | dev_dbg(hub_dev, "ganged power switching\n"); |
| 614 | break; |
| 615 | case 0x01: |
| 616 | dev_dbg(hub_dev, "individual port power switching\n"); |
| 617 | break; |
| 618 | case 0x02: |
| 619 | case 0x03: |
| 620 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
| 621 | break; |
| 622 | } |
| 623 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 624 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | case 0x00: |
| 626 | dev_dbg(hub_dev, "global over-current protection\n"); |
| 627 | break; |
| 628 | case 0x08: |
| 629 | dev_dbg(hub_dev, "individual port over-current protection\n"); |
| 630 | break; |
| 631 | case 0x10: |
| 632 | case 0x18: |
| 633 | dev_dbg(hub_dev, "no over-current protection\n"); |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | spin_lock_init (&hub->tt.lock); |
| 638 | INIT_LIST_HEAD (&hub->tt.clear_list); |
| 639 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub); |
| 640 | switch (hdev->descriptor.bDeviceProtocol) { |
| 641 | case 0: |
| 642 | break; |
| 643 | case 1: |
| 644 | dev_dbg(hub_dev, "Single TT\n"); |
| 645 | hub->tt.hub = hdev; |
| 646 | break; |
| 647 | case 2: |
| 648 | ret = usb_set_interface(hdev, 0, 1); |
| 649 | if (ret == 0) { |
| 650 | dev_dbg(hub_dev, "TT per port\n"); |
| 651 | hub->tt.multi = 1; |
| 652 | } else |
| 653 | dev_err(hub_dev, "Using single TT (err %d)\n", |
| 654 | ret); |
| 655 | hub->tt.hub = hdev; |
| 656 | break; |
| 657 | default: |
| 658 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
| 659 | hdev->descriptor.bDeviceProtocol); |
| 660 | break; |
| 661 | } |
| 662 | |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 663 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 664 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 665 | case HUB_TTTT_8_BITS: |
| 666 | if (hdev->descriptor.bDeviceProtocol != 0) { |
| 667 | hub->tt.think_time = 666; |
| 668 | dev_dbg(hub_dev, "TT requires at most %d " |
| 669 | "FS bit times (%d ns)\n", |
| 670 | 8, hub->tt.think_time); |
| 671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 673 | case HUB_TTTT_16_BITS: |
| 674 | hub->tt.think_time = 666 * 2; |
| 675 | dev_dbg(hub_dev, "TT requires at most %d " |
| 676 | "FS bit times (%d ns)\n", |
| 677 | 16, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 679 | case HUB_TTTT_24_BITS: |
| 680 | hub->tt.think_time = 666 * 3; |
| 681 | dev_dbg(hub_dev, "TT requires at most %d " |
| 682 | "FS bit times (%d ns)\n", |
| 683 | 24, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | break; |
david-b@pacbell.net | e09711a | 2005-08-13 18:41:04 -0700 | [diff] [blame] | 685 | case HUB_TTTT_32_BITS: |
| 686 | hub->tt.think_time = 666 * 4; |
| 687 | dev_dbg(hub_dev, "TT requires at most %d " |
| 688 | "FS bit times (%d ns)\n", |
| 689 | 32, hub->tt.think_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | break; |
| 691 | } |
| 692 | |
| 693 | /* probe() zeroes hub->indicator[] */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 694 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | hub->has_indicators = 1; |
| 696 | dev_dbg(hub_dev, "Port indicators are supported\n"); |
| 697 | } |
| 698 | |
| 699 | dev_dbg(hub_dev, "power on to power good time: %dms\n", |
| 700 | hub->descriptor->bPwrOn2PwrGood * 2); |
| 701 | |
| 702 | /* power budgeting mostly matters with bus-powered hubs, |
| 703 | * and battery-powered root hubs (may provide just 8 mA). |
| 704 | */ |
| 705 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 706 | if (ret < 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | message = "can't get hub status"; |
| 708 | goto fail; |
| 709 | } |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 710 | le16_to_cpus(&hubstatus); |
| 711 | if (hdev == hdev->bus->root_hub) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 712 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
| 713 | hub->mA_per_port = 500; |
| 714 | else { |
| 715 | hub->mA_per_port = hdev->bus_mA; |
| 716 | hub->limited_power = 1; |
| 717 | } |
Alan Stern | 7d35b92 | 2005-04-25 11:18:32 -0400 | [diff] [blame] | 718 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
| 720 | hub->descriptor->bHubContrCurrent); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 721 | hub->limited_power = 1; |
| 722 | if (hdev->maxchild > 0) { |
| 723 | int remaining = hdev->bus_mA - |
| 724 | hub->descriptor->bHubContrCurrent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 726 | if (remaining < hdev->maxchild * 100) |
| 727 | dev_warn(hub_dev, |
| 728 | "insufficient power available " |
| 729 | "to use all downstream ports\n"); |
| 730 | hub->mA_per_port = 100; /* 7.2.1.1 */ |
| 731 | } |
| 732 | } else { /* Self-powered external hub */ |
| 733 | /* FIXME: What about battery-powered external hubs that |
| 734 | * provide less current per port? */ |
| 735 | hub->mA_per_port = 500; |
| 736 | } |
| 737 | if (hub->mA_per_port < 500) |
| 738 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
| 739 | hub->mA_per_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
| 742 | if (ret < 0) { |
| 743 | message = "can't get hub status"; |
| 744 | goto fail; |
| 745 | } |
| 746 | |
| 747 | /* local power status reports aren't always correct */ |
| 748 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
| 749 | dev_dbg(hub_dev, "local power source is %s\n", |
| 750 | (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 751 | ? "lost (inactive)" : "good"); |
| 752 | |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 753 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
| 755 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
| 756 | |
| 757 | /* set up the interrupt endpoint */ |
| 758 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
| 759 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
| 760 | |
| 761 | if (maxp > sizeof(*hub->buffer)) |
| 762 | maxp = sizeof(*hub->buffer); |
| 763 | |
| 764 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
| 765 | if (!hub->urb) { |
| 766 | message = "couldn't allocate interrupt urb"; |
| 767 | ret = -ENOMEM; |
| 768 | goto fail; |
| 769 | } |
| 770 | |
| 771 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
| 772 | hub, endpoint->bInterval); |
| 773 | hub->urb->transfer_dma = hub->buffer_dma; |
| 774 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 775 | |
| 776 | /* maybe cycle the hub leds */ |
| 777 | if (hub->has_indicators && blinkenlights) |
| 778 | hub->indicator [0] = INDICATOR_CYCLE; |
| 779 | |
| 780 | hub_power_on(hub); |
| 781 | hub_activate(hub); |
| 782 | return 0; |
| 783 | |
| 784 | fail: |
| 785 | dev_err (hub_dev, "config failed, %s (err %d)\n", |
| 786 | message, ret); |
| 787 | /* hub_disconnect() frees urb and descriptor */ |
| 788 | return ret; |
| 789 | } |
| 790 | |
| 791 | static unsigned highspeed_hubs; |
| 792 | |
| 793 | static void hub_disconnect(struct usb_interface *intf) |
| 794 | { |
| 795 | struct usb_hub *hub = usb_get_intfdata (intf); |
| 796 | struct usb_device *hdev; |
| 797 | |
Alan Stern | 8b28c75 | 2005-08-10 17:04:13 -0400 | [diff] [blame] | 798 | usb_set_intfdata (intf, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | hdev = hub->hdev; |
| 800 | |
| 801 | if (hdev->speed == USB_SPEED_HIGH) |
| 802 | highspeed_hubs--; |
| 803 | |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 804 | /* Disconnect all children and quiesce the hub */ |
| 805 | hub_pre_reset(hub, 1); |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | usb_free_urb(hub->urb); |
| 808 | hub->urb = NULL; |
| 809 | |
| 810 | spin_lock_irq(&hub_event_lock); |
| 811 | list_del_init(&hub->event_list); |
| 812 | spin_unlock_irq(&hub_event_lock); |
| 813 | |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 814 | kfree(hub->descriptor); |
| 815 | hub->descriptor = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 817 | kfree(hub->status); |
| 818 | hub->status = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | if (hub->buffer) { |
| 821 | usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, |
| 822 | hub->buffer_dma); |
| 823 | hub->buffer = NULL; |
| 824 | } |
| 825 | |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 826 | kfree(hub); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| 830 | { |
| 831 | struct usb_host_interface *desc; |
| 832 | struct usb_endpoint_descriptor *endpoint; |
| 833 | struct usb_device *hdev; |
| 834 | struct usb_hub *hub; |
| 835 | |
| 836 | desc = intf->cur_altsetting; |
| 837 | hdev = interface_to_usbdev(intf); |
| 838 | |
| 839 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
| 840 | /* specs is not defined, but it works */ |
| 841 | if ((desc->desc.bInterfaceSubClass != 0) && |
| 842 | (desc->desc.bInterfaceSubClass != 1)) { |
| 843 | descriptor_error: |
| 844 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); |
| 845 | return -EIO; |
| 846 | } |
| 847 | |
| 848 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
| 849 | if (desc->desc.bNumEndpoints != 1) |
| 850 | goto descriptor_error; |
| 851 | |
| 852 | endpoint = &desc->endpoint[0].desc; |
| 853 | |
| 854 | /* Output endpoint? Curiouser and curiouser.. */ |
| 855 | if (!(endpoint->bEndpointAddress & USB_DIR_IN)) |
| 856 | goto descriptor_error; |
| 857 | |
| 858 | /* If it's not an interrupt endpoint, we'd better punt! */ |
| 859 | if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 860 | != USB_ENDPOINT_XFER_INT) |
| 861 | goto descriptor_error; |
| 862 | |
| 863 | /* We found a hub */ |
| 864 | dev_info (&intf->dev, "USB hub found\n"); |
| 865 | |
Alan Stern | 0a1ef3b | 2005-10-24 15:38:24 -0400 | [diff] [blame] | 866 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | if (!hub) { |
| 868 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); |
| 869 | return -ENOMEM; |
| 870 | } |
| 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | INIT_LIST_HEAD(&hub->event_list); |
| 873 | hub->intfdev = &intf->dev; |
| 874 | hub->hdev = hdev; |
| 875 | INIT_WORK(&hub->leds, led_work, hub); |
| 876 | |
| 877 | usb_set_intfdata (intf, hub); |
| 878 | |
| 879 | if (hdev->speed == USB_SPEED_HIGH) |
| 880 | highspeed_hubs++; |
| 881 | |
| 882 | if (hub_configure(hub, endpoint) >= 0) |
| 883 | return 0; |
| 884 | |
| 885 | hub_disconnect (intf); |
| 886 | return -ENODEV; |
| 887 | } |
| 888 | |
| 889 | static int |
| 890 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
| 891 | { |
| 892 | struct usb_device *hdev = interface_to_usbdev (intf); |
| 893 | |
| 894 | /* assert ifno == 0 (part of hub spec) */ |
| 895 | switch (code) { |
| 896 | case USBDEVFS_HUB_PORTINFO: { |
| 897 | struct usbdevfs_hub_portinfo *info = user_data; |
| 898 | int i; |
| 899 | |
| 900 | spin_lock_irq(&device_state_lock); |
| 901 | if (hdev->devnum <= 0) |
| 902 | info->nports = 0; |
| 903 | else { |
| 904 | info->nports = hdev->maxchild; |
| 905 | for (i = 0; i < info->nports; i++) { |
| 906 | if (hdev->children[i] == NULL) |
| 907 | info->port[i] = 0; |
| 908 | else |
| 909 | info->port[i] = |
| 910 | hdev->children[i]->devnum; |
| 911 | } |
| 912 | } |
| 913 | spin_unlock_irq(&device_state_lock); |
| 914 | |
| 915 | return info->nports + 1; |
| 916 | } |
| 917 | |
| 918 | default: |
| 919 | return -ENOSYS; |
| 920 | } |
| 921 | } |
| 922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
| 924 | /* grab device/port lock, returning index of that port (zero based). |
| 925 | * protects the upstream link used by this device from concurrent |
| 926 | * tree operations like suspend, resume, reset, and disconnect, which |
| 927 | * apply to everything downstream of a given port. |
| 928 | */ |
| 929 | static int locktree(struct usb_device *udev) |
| 930 | { |
| 931 | int t; |
| 932 | struct usb_device *hdev; |
| 933 | |
| 934 | if (!udev) |
| 935 | return -ENODEV; |
| 936 | |
| 937 | /* root hub is always the first lock in the series */ |
| 938 | hdev = udev->parent; |
| 939 | if (!hdev) { |
| 940 | usb_lock_device(udev); |
| 941 | return 0; |
| 942 | } |
| 943 | |
| 944 | /* on the path from root to us, lock everything from |
| 945 | * top down, dropping parent locks when not needed |
| 946 | */ |
| 947 | t = locktree(hdev); |
| 948 | if (t < 0) |
| 949 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 951 | /* everything is fail-fast once disconnect |
| 952 | * processing starts |
| 953 | */ |
| 954 | if (udev->state == USB_STATE_NOTATTACHED) { |
| 955 | usb_unlock_device(hdev); |
| 956 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 958 | |
| 959 | /* when everyone grabs locks top->bottom, |
| 960 | * non-overlapping work may be concurrent |
| 961 | */ |
| 962 | usb_lock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | usb_unlock_device(hdev); |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 964 | return udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
| 968 | { |
| 969 | int i; |
| 970 | |
| 971 | for (i = 0; i < udev->maxchild; ++i) { |
| 972 | if (udev->children[i]) |
| 973 | recursively_mark_NOTATTACHED(udev->children[i]); |
| 974 | } |
| 975 | udev->state = USB_STATE_NOTATTACHED; |
| 976 | } |
| 977 | |
| 978 | /** |
| 979 | * usb_set_device_state - change a device's current state (usbcore, hcds) |
| 980 | * @udev: pointer to device whose state should be changed |
| 981 | * @new_state: new state value to be stored |
| 982 | * |
| 983 | * udev->state is _not_ fully protected by the device lock. Although |
| 984 | * most transitions are made only while holding the lock, the state can |
| 985 | * can change to USB_STATE_NOTATTACHED at almost any time. This |
| 986 | * is so that devices can be marked as disconnected as soon as possible, |
| 987 | * without having to wait for any semaphores to be released. As a result, |
| 988 | * all changes to any device's state must be protected by the |
| 989 | * device_state_lock spinlock. |
| 990 | * |
| 991 | * Once a device has been added to the device tree, all changes to its state |
| 992 | * should be made using this routine. The state should _not_ be set directly. |
| 993 | * |
| 994 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
| 995 | * Otherwise udev->state is set to new_state, and if new_state is |
| 996 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
| 997 | * to USB_STATE_NOTATTACHED. |
| 998 | */ |
| 999 | void usb_set_device_state(struct usb_device *udev, |
| 1000 | enum usb_device_state new_state) |
| 1001 | { |
| 1002 | unsigned long flags; |
| 1003 | |
| 1004 | spin_lock_irqsave(&device_state_lock, flags); |
| 1005 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1006 | ; /* do nothing */ |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 1007 | else if (new_state != USB_STATE_NOTATTACHED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | udev->state = new_state; |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1009 | |
| 1010 | /* root hub wakeup capabilities are managed out-of-band |
| 1011 | * and may involve silicon errata ... ignore them here. |
| 1012 | */ |
| 1013 | if (udev->parent) { |
| 1014 | if (new_state == USB_STATE_CONFIGURED) |
| 1015 | device_init_wakeup(&udev->dev, |
| 1016 | (udev->actconfig->desc.bmAttributes |
| 1017 | & USB_CONFIG_ATT_WAKEUP)); |
| 1018 | else if (new_state != USB_STATE_SUSPENDED) |
| 1019 | device_init_wakeup(&udev->dev, 0); |
| 1020 | } |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 1021 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | recursively_mark_NOTATTACHED(udev); |
| 1023 | spin_unlock_irqrestore(&device_state_lock, flags); |
| 1024 | } |
| 1025 | EXPORT_SYMBOL(usb_set_device_state); |
| 1026 | |
| 1027 | |
Alan Stern | 1c50c31 | 2005-11-14 11:45:38 -0500 | [diff] [blame] | 1028 | #ifdef CONFIG_PM |
| 1029 | |
| 1030 | /** |
| 1031 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
| 1032 | * @rhdev: struct usb_device for the root hub |
| 1033 | * |
| 1034 | * The USB host controller driver calls this function when its root hub |
| 1035 | * is resumed and Vbus power has been interrupted or the controller |
| 1036 | * has been reset. The routine marks all the children of the root hub |
| 1037 | * as NOTATTACHED and marks logical connect-change events on their ports. |
| 1038 | */ |
| 1039 | void usb_root_hub_lost_power(struct usb_device *rhdev) |
| 1040 | { |
| 1041 | struct usb_hub *hub; |
| 1042 | int port1; |
| 1043 | unsigned long flags; |
| 1044 | |
| 1045 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); |
| 1046 | spin_lock_irqsave(&device_state_lock, flags); |
| 1047 | hub = hdev_to_hub(rhdev); |
| 1048 | for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { |
| 1049 | if (rhdev->children[port1 - 1]) { |
| 1050 | recursively_mark_NOTATTACHED( |
| 1051 | rhdev->children[port1 - 1]); |
| 1052 | set_bit(port1, hub->change_bits); |
| 1053 | } |
| 1054 | } |
| 1055 | spin_unlock_irqrestore(&device_state_lock, flags); |
| 1056 | } |
| 1057 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
| 1058 | |
| 1059 | #endif |
| 1060 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | static void choose_address(struct usb_device *udev) |
| 1062 | { |
| 1063 | int devnum; |
| 1064 | struct usb_bus *bus = udev->bus; |
| 1065 | |
| 1066 | /* If khubd ever becomes multithreaded, this will need a lock */ |
| 1067 | |
| 1068 | /* Try to allocate the next devnum beginning at bus->devnum_next. */ |
| 1069 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
| 1070 | bus->devnum_next); |
| 1071 | if (devnum >= 128) |
| 1072 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); |
| 1073 | |
| 1074 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); |
| 1075 | |
| 1076 | if (devnum < 128) { |
| 1077 | set_bit(devnum, bus->devmap.devicemap); |
| 1078 | udev->devnum = devnum; |
| 1079 | } |
| 1080 | } |
| 1081 | |
| 1082 | static void release_address(struct usb_device *udev) |
| 1083 | { |
| 1084 | if (udev->devnum > 0) { |
| 1085 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
| 1086 | udev->devnum = -1; |
| 1087 | } |
| 1088 | } |
| 1089 | |
| 1090 | /** |
| 1091 | * usb_disconnect - disconnect a device (usbcore-internal) |
| 1092 | * @pdev: pointer to device being disconnected |
| 1093 | * Context: !in_interrupt () |
| 1094 | * |
| 1095 | * Something got disconnected. Get rid of it and all of its children. |
| 1096 | * |
| 1097 | * If *pdev is a normal device then the parent hub must already be locked. |
| 1098 | * If *pdev is a root hub then this routine will acquire the |
| 1099 | * usb_bus_list_lock on behalf of the caller. |
| 1100 | * |
| 1101 | * Only hub drivers (including virtual root hub drivers for host |
| 1102 | * controllers) should ever call this. |
| 1103 | * |
| 1104 | * This call is synchronous, and may not be used in an interrupt context. |
| 1105 | */ |
| 1106 | void usb_disconnect(struct usb_device **pdev) |
| 1107 | { |
| 1108 | struct usb_device *udev = *pdev; |
| 1109 | int i; |
| 1110 | |
| 1111 | if (!udev) { |
| 1112 | pr_debug ("%s nodev\n", __FUNCTION__); |
| 1113 | return; |
| 1114 | } |
| 1115 | |
| 1116 | /* mark the device as inactive, so any further urb submissions for |
| 1117 | * this device (and any of its children) will fail immediately. |
| 1118 | * this quiesces everyting except pending urbs. |
| 1119 | */ |
| 1120 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
| 1122 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1123 | usb_lock_device(udev); |
| 1124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | /* Free up all the children before we remove this device */ |
| 1126 | for (i = 0; i < USB_MAXCHILDREN; i++) { |
| 1127 | if (udev->children[i]) |
| 1128 | usb_disconnect(&udev->children[i]); |
| 1129 | } |
| 1130 | |
| 1131 | /* deallocate hcd/hardware state ... nuking all pending urbs and |
| 1132 | * cleaning up all state associated with the current configuration |
| 1133 | * so that the hardware is now fully quiesced. |
| 1134 | */ |
| 1135 | usb_disable_device(udev, 0); |
| 1136 | |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1137 | usb_notify_remove_device(udev); |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | /* Free the device number, remove the /proc/bus/usb entry and |
| 1140 | * the sysfs attributes, and delete the parent's children[] |
| 1141 | * (or root_hub) pointer. |
| 1142 | */ |
| 1143 | dev_dbg (&udev->dev, "unregistering device\n"); |
| 1144 | release_address(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | usb_remove_sysfs_dev_files(udev); |
| 1146 | |
| 1147 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
| 1148 | spin_lock_irq(&device_state_lock); |
| 1149 | *pdev = NULL; |
| 1150 | spin_unlock_irq(&device_state_lock); |
| 1151 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1152 | usb_unlock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
| 1154 | device_unregister(&udev->dev); |
| 1155 | } |
| 1156 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1157 | static inline const char *plural(int n) |
| 1158 | { |
| 1159 | return (n == 1 ? "" : "s"); |
| 1160 | } |
| 1161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | static int choose_configuration(struct usb_device *udev) |
| 1163 | { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1164 | int i; |
| 1165 | u16 devstatus; |
| 1166 | int bus_powered; |
| 1167 | int num_configs; |
| 1168 | struct usb_host_config *c, *best; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1170 | /* If this fails, assume the device is bus-powered */ |
| 1171 | devstatus = 0; |
| 1172 | usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
| 1173 | le16_to_cpus(&devstatus); |
| 1174 | bus_powered = ((devstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0); |
| 1175 | dev_dbg(&udev->dev, "device is %s-powered\n", |
| 1176 | bus_powered ? "bus" : "self"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1178 | best = NULL; |
| 1179 | c = udev->config; |
| 1180 | num_configs = udev->descriptor.bNumConfigurations; |
| 1181 | for (i = 0; i < num_configs; (i++, c++)) { |
Alan Stern | 6aa3567 | 2006-03-08 15:14:09 -0500 | [diff] [blame] | 1182 | struct usb_interface_descriptor *desc = NULL; |
| 1183 | |
| 1184 | /* It's possible that a config has no interfaces! */ |
| 1185 | if (c->desc.bNumInterfaces > 0) |
| 1186 | desc = &c->intf_cache[0]->altsetting->desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1188 | /* |
| 1189 | * HP's USB bus-powered keyboard has only one configuration |
| 1190 | * and it claims to be self-powered; other devices may have |
| 1191 | * similar errors in their descriptors. If the next test |
| 1192 | * were allowed to execute, such configurations would always |
| 1193 | * be rejected and the devices would not work as expected. |
| 1194 | */ |
| 1195 | #if 0 |
| 1196 | /* Rule out self-powered configs for a bus-powered device */ |
| 1197 | if (bus_powered && (c->desc.bmAttributes & |
| 1198 | USB_CONFIG_ATT_SELFPOWER)) |
| 1199 | continue; |
| 1200 | #endif |
| 1201 | |
| 1202 | /* |
| 1203 | * The next test may not be as effective as it should be. |
| 1204 | * Some hubs have errors in their descriptor, claiming |
| 1205 | * to be self-powered when they are really bus-powered. |
| 1206 | * We will overestimate the amount of current such hubs |
| 1207 | * make available for each port. |
| 1208 | * |
| 1209 | * This is a fairly benign sort of failure. It won't |
| 1210 | * cause us to reject configurations that we should have |
| 1211 | * accepted. |
| 1212 | */ |
| 1213 | |
| 1214 | /* Rule out configs that draw too much bus current */ |
| 1215 | if (c->desc.bMaxPower * 2 > udev->bus_mA) |
| 1216 | continue; |
| 1217 | |
| 1218 | /* If the first config's first interface is COMM/2/0xff |
| 1219 | * (MSFT RNDIS), rule it out unless Linux has host-side |
| 1220 | * RNDIS support. */ |
Alan Stern | 6aa3567 | 2006-03-08 15:14:09 -0500 | [diff] [blame] | 1221 | if (i == 0 && desc |
| 1222 | && desc->bInterfaceClass == USB_CLASS_COMM |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1223 | && desc->bInterfaceSubClass == 2 |
| 1224 | && desc->bInterfaceProtocol == 0xff) { |
| 1225 | #ifndef CONFIG_USB_NET_RNDIS |
| 1226 | continue; |
| 1227 | #else |
| 1228 | best = c; |
| 1229 | #endif |
| 1230 | } |
| 1231 | |
| 1232 | /* From the remaining configs, choose the first one whose |
| 1233 | * first interface is for a non-vendor-specific class. |
| 1234 | * Reason: Linux is more likely to have a class driver |
| 1235 | * than a vendor-specific driver. */ |
| 1236 | else if (udev->descriptor.bDeviceClass != |
| 1237 | USB_CLASS_VENDOR_SPEC && |
Alan Stern | 6aa3567 | 2006-03-08 15:14:09 -0500 | [diff] [blame] | 1238 | (!desc || desc->bInterfaceClass != |
| 1239 | USB_CLASS_VENDOR_SPEC)) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1240 | best = c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | break; |
| 1242 | } |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1243 | |
| 1244 | /* If all the remaining configs are vendor-specific, |
| 1245 | * choose the first one. */ |
| 1246 | else if (!best) |
| 1247 | best = c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1249 | |
| 1250 | if (best) { |
| 1251 | i = best->desc.bConfigurationValue; |
| 1252 | dev_info(&udev->dev, |
| 1253 | "configuration #%d chosen from %d choice%s\n", |
| 1254 | i, num_configs, plural(num_configs)); |
| 1255 | } else { |
| 1256 | i = -1; |
| 1257 | dev_warn(&udev->dev, |
| 1258 | "no configuration chosen from %d choice%s\n", |
| 1259 | num_configs, plural(num_configs)); |
| 1260 | } |
| 1261 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
| 1264 | #ifdef DEBUG |
| 1265 | static void show_string(struct usb_device *udev, char *id, char *string) |
| 1266 | { |
| 1267 | if (!string) |
| 1268 | return; |
| 1269 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); |
| 1270 | } |
| 1271 | |
| 1272 | #else |
| 1273 | static inline void show_string(struct usb_device *udev, char *id, char *string) |
| 1274 | {} |
| 1275 | #endif |
| 1276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
| 1278 | #ifdef CONFIG_USB_OTG |
| 1279 | #include "otg_whitelist.h" |
| 1280 | #endif |
| 1281 | |
| 1282 | /** |
| 1283 | * usb_new_device - perform initial device setup (usbcore-internal) |
| 1284 | * @udev: newly addressed device (in ADDRESS state) |
| 1285 | * |
| 1286 | * This is called with devices which have been enumerated, but not yet |
| 1287 | * configured. The device descriptor is available, but not descriptors |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1288 | * for any device configuration. The caller must have locked either |
| 1289 | * the parent hub (if udev is a normal device) or else the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to |
| 1291 | * udev has already been installed, but udev is not yet visible through |
| 1292 | * sysfs or other filesystem code. |
| 1293 | * |
| 1294 | * Returns 0 for success (device is configured and listed, with its |
| 1295 | * interfaces, in sysfs); else a negative errno value. |
| 1296 | * |
| 1297 | * This call is synchronous, and may not be used in an interrupt context. |
| 1298 | * |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1299 | * Only the hub driver or root-hub registrar should ever call this. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | */ |
| 1301 | int usb_new_device(struct usb_device *udev) |
| 1302 | { |
| 1303 | int err; |
| 1304 | int c; |
| 1305 | |
| 1306 | err = usb_get_configuration(udev); |
| 1307 | if (err < 0) { |
| 1308 | dev_err(&udev->dev, "can't read configurations, error %d\n", |
| 1309 | err); |
| 1310 | goto fail; |
| 1311 | } |
| 1312 | |
| 1313 | /* read the standard strings and cache them if present */ |
Alan Stern | 4f62efe | 2005-10-24 16:24:14 -0400 | [diff] [blame] | 1314 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
| 1315 | udev->manufacturer = usb_cache_string(udev, |
| 1316 | udev->descriptor.iManufacturer); |
| 1317 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
| 1319 | /* Tell the world! */ |
| 1320 | dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " |
| 1321 | "SerialNumber=%d\n", |
| 1322 | udev->descriptor.iManufacturer, |
| 1323 | udev->descriptor.iProduct, |
| 1324 | udev->descriptor.iSerialNumber); |
| 1325 | show_string(udev, "Product", udev->product); |
| 1326 | show_string(udev, "Manufacturer", udev->manufacturer); |
| 1327 | show_string(udev, "SerialNumber", udev->serial); |
| 1328 | |
| 1329 | #ifdef CONFIG_USB_OTG |
| 1330 | /* |
| 1331 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
| 1332 | * to wake us after we've powered off VBUS; and HNP, switching roles |
| 1333 | * "host" to "peripheral". The OTG descriptor helps figure this out. |
| 1334 | */ |
| 1335 | if (!udev->bus->is_b_host |
| 1336 | && udev->config |
| 1337 | && udev->parent == udev->bus->root_hub) { |
| 1338 | struct usb_otg_descriptor *desc = 0; |
| 1339 | struct usb_bus *bus = udev->bus; |
| 1340 | |
| 1341 | /* descriptor may appear anywhere in config */ |
| 1342 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], |
| 1343 | le16_to_cpu(udev->config[0].desc.wTotalLength), |
| 1344 | USB_DT_OTG, (void **) &desc) == 0) { |
| 1345 | if (desc->bmAttributes & USB_OTG_HNP) { |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 1346 | unsigned port1 = udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | struct usb_device *root = udev->parent; |
| 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | dev_info(&udev->dev, |
| 1350 | "Dual-Role OTG device on %sHNP port\n", |
| 1351 | (port1 == bus->otg_port) |
| 1352 | ? "" : "non-"); |
| 1353 | |
| 1354 | /* enable HNP before suspend, it's simpler */ |
| 1355 | if (port1 == bus->otg_port) |
| 1356 | bus->b_hnp_enable = 1; |
| 1357 | err = usb_control_msg(udev, |
| 1358 | usb_sndctrlpipe(udev, 0), |
| 1359 | USB_REQ_SET_FEATURE, 0, |
| 1360 | bus->b_hnp_enable |
| 1361 | ? USB_DEVICE_B_HNP_ENABLE |
| 1362 | : USB_DEVICE_A_ALT_HNP_SUPPORT, |
| 1363 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 1364 | if (err < 0) { |
| 1365 | /* OTG MESSAGE: report errors here, |
| 1366 | * customize to match your product. |
| 1367 | */ |
| 1368 | dev_info(&udev->dev, |
| 1369 | "can't set HNP mode; %d\n", |
| 1370 | err); |
| 1371 | bus->b_hnp_enable = 0; |
| 1372 | } |
| 1373 | } |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | if (!is_targeted(udev)) { |
| 1378 | |
| 1379 | /* Maybe it can talk to us, though we can't talk to it. |
| 1380 | * (Includes HNP test device.) |
| 1381 | */ |
| 1382 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1383 | static int __usb_suspend_device(struct usb_device *, |
| 1384 | int port1); |
| 1385 | err = __usb_suspend_device(udev, udev->bus->otg_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | if (err < 0) |
| 1387 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
| 1388 | } |
| 1389 | err = -ENODEV; |
| 1390 | goto fail; |
| 1391 | } |
| 1392 | #endif |
| 1393 | |
| 1394 | /* put device-specific files into sysfs */ |
| 1395 | err = device_add (&udev->dev); |
| 1396 | if (err) { |
| 1397 | dev_err(&udev->dev, "can't device_add, error %d\n", err); |
| 1398 | goto fail; |
| 1399 | } |
| 1400 | usb_create_sysfs_dev_files (udev); |
| 1401 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1402 | usb_lock_device(udev); |
| 1403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | /* choose and set the configuration. that registers the interfaces |
| 1405 | * with the driver core, and lets usb device drivers bind to them. |
| 1406 | */ |
| 1407 | c = choose_configuration(udev); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1408 | if (c >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | err = usb_set_configuration(udev, c); |
| 1410 | if (err) { |
| 1411 | dev_err(&udev->dev, "can't set config #%d, error %d\n", |
| 1412 | c, err); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1413 | /* This need not be fatal. The user can try to |
| 1414 | * set other configurations. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | /* USB device state == configured ... usable */ |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 1419 | usb_notify_add_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1421 | usb_unlock_device(udev); |
| 1422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | return 0; |
| 1424 | |
| 1425 | fail: |
| 1426 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
| 1427 | return err; |
| 1428 | } |
| 1429 | |
| 1430 | |
| 1431 | static int hub_port_status(struct usb_hub *hub, int port1, |
| 1432 | u16 *status, u16 *change) |
| 1433 | { |
| 1434 | int ret; |
| 1435 | |
| 1436 | ret = get_port_status(hub->hdev, port1, &hub->status->port); |
| 1437 | if (ret < 0) |
| 1438 | dev_err (hub->intfdev, |
| 1439 | "%s failed (err = %d)\n", __FUNCTION__, ret); |
| 1440 | else { |
| 1441 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
| 1442 | *change = le16_to_cpu(hub->status->port.wPortChange); |
| 1443 | ret = 0; |
| 1444 | } |
| 1445 | return ret; |
| 1446 | } |
| 1447 | |
| 1448 | #define PORT_RESET_TRIES 5 |
| 1449 | #define SET_ADDRESS_TRIES 2 |
| 1450 | #define GET_DESCRIPTOR_TRIES 2 |
| 1451 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) |
| 1452 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) |
| 1453 | |
| 1454 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| 1455 | #define HUB_SHORT_RESET_TIME 10 |
| 1456 | #define HUB_LONG_RESET_TIME 200 |
| 1457 | #define HUB_RESET_TIMEOUT 500 |
| 1458 | |
| 1459 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
| 1460 | struct usb_device *udev, unsigned int delay) |
| 1461 | { |
| 1462 | int delay_time, ret; |
| 1463 | u16 portstatus; |
| 1464 | u16 portchange; |
| 1465 | |
| 1466 | for (delay_time = 0; |
| 1467 | delay_time < HUB_RESET_TIMEOUT; |
| 1468 | delay_time += delay) { |
| 1469 | /* wait to give the device a chance to reset */ |
| 1470 | msleep(delay); |
| 1471 | |
| 1472 | /* read and decode port status */ |
| 1473 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 1474 | if (ret < 0) |
| 1475 | return ret; |
| 1476 | |
| 1477 | /* Device went away? */ |
| 1478 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
| 1479 | return -ENOTCONN; |
| 1480 | |
| 1481 | /* bomb out completely if something weird happened */ |
| 1482 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
| 1483 | return -EINVAL; |
| 1484 | |
| 1485 | /* if we`ve finished resetting, then break out of the loop */ |
| 1486 | if (!(portstatus & USB_PORT_STAT_RESET) && |
| 1487 | (portstatus & USB_PORT_STAT_ENABLE)) { |
| 1488 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
| 1489 | udev->speed = USB_SPEED_HIGH; |
| 1490 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
| 1491 | udev->speed = USB_SPEED_LOW; |
| 1492 | else |
| 1493 | udev->speed = USB_SPEED_FULL; |
| 1494 | return 0; |
| 1495 | } |
| 1496 | |
| 1497 | /* switch to the long delay after two short delay failures */ |
| 1498 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
| 1499 | delay = HUB_LONG_RESET_TIME; |
| 1500 | |
| 1501 | dev_dbg (hub->intfdev, |
| 1502 | "port %d not reset yet, waiting %dms\n", |
| 1503 | port1, delay); |
| 1504 | } |
| 1505 | |
| 1506 | return -EBUSY; |
| 1507 | } |
| 1508 | |
| 1509 | static int hub_port_reset(struct usb_hub *hub, int port1, |
| 1510 | struct usb_device *udev, unsigned int delay) |
| 1511 | { |
| 1512 | int i, status; |
| 1513 | |
| 1514 | /* Reset the port */ |
| 1515 | for (i = 0; i < PORT_RESET_TRIES; i++) { |
| 1516 | status = set_port_feature(hub->hdev, |
| 1517 | port1, USB_PORT_FEAT_RESET); |
| 1518 | if (status) |
| 1519 | dev_err(hub->intfdev, |
| 1520 | "cannot reset port %d (err = %d)\n", |
| 1521 | port1, status); |
| 1522 | else { |
| 1523 | status = hub_port_wait_reset(hub, port1, udev, delay); |
David Brownell | dd16525 | 2005-08-31 10:45:25 -0700 | [diff] [blame] | 1524 | if (status && status != -ENOTCONN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | dev_dbg(hub->intfdev, |
| 1526 | "port_wait_reset: err = %d\n", |
| 1527 | status); |
| 1528 | } |
| 1529 | |
| 1530 | /* return on disconnect or reset */ |
| 1531 | switch (status) { |
| 1532 | case 0: |
David Brownell | b789696 | 2005-08-31 10:41:44 -0700 | [diff] [blame] | 1533 | /* TRSTRCY = 10 ms; plus some extra */ |
| 1534 | msleep(10 + 40); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | /* FALL THROUGH */ |
| 1536 | case -ENOTCONN: |
| 1537 | case -ENODEV: |
| 1538 | clear_port_feature(hub->hdev, |
| 1539 | port1, USB_PORT_FEAT_C_RESET); |
| 1540 | /* FIXME need disconnect() for NOTATTACHED device */ |
| 1541 | usb_set_device_state(udev, status |
| 1542 | ? USB_STATE_NOTATTACHED |
| 1543 | : USB_STATE_DEFAULT); |
| 1544 | return status; |
| 1545 | } |
| 1546 | |
| 1547 | dev_dbg (hub->intfdev, |
| 1548 | "port %d not enabled, trying reset again...\n", |
| 1549 | port1); |
| 1550 | delay = HUB_LONG_RESET_TIME; |
| 1551 | } |
| 1552 | |
| 1553 | dev_err (hub->intfdev, |
| 1554 | "Cannot enable port %i. Maybe the USB cable is bad?\n", |
| 1555 | port1); |
| 1556 | |
| 1557 | return status; |
| 1558 | } |
| 1559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | /* |
| 1561 | * Disable a port and mark a logical connnect-change event, so that some |
| 1562 | * time later khubd will disconnect() any existing usb_device on the port |
| 1563 | * and will re-enumerate if there actually is a device attached. |
| 1564 | */ |
| 1565 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
| 1566 | { |
| 1567 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); |
| 1568 | hub_port_disable(hub, port1, 1); |
| 1569 | |
| 1570 | /* FIXME let caller ask to power down the port: |
| 1571 | * - some devices won't enumerate without a VBUS power cycle |
| 1572 | * - SRP saves power that way |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1573 | * - ... new call, TBD ... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | * That's easy if this hub can switch power per-port, and |
| 1575 | * khubd reactivates the port later (timer, SRP, etc). |
| 1576 | * Powerdown must be optional, because of reset/DFU. |
| 1577 | */ |
| 1578 | |
| 1579 | set_bit(port1, hub->change_bits); |
| 1580 | kick_khubd(hub); |
| 1581 | } |
| 1582 | |
| 1583 | |
| 1584 | #ifdef CONFIG_USB_SUSPEND |
| 1585 | |
| 1586 | /* |
| 1587 | * Selective port suspend reduces power; most suspended devices draw |
| 1588 | * less than 500 uA. It's also used in OTG, along with remote wakeup. |
| 1589 | * All devices below the suspended port are also suspended. |
| 1590 | * |
| 1591 | * Devices leave suspend state when the host wakes them up. Some devices |
| 1592 | * also support "remote wakeup", where the device can activate the USB |
| 1593 | * tree above them to deliver data, such as a keypress or packet. In |
| 1594 | * some cases, this wakes the USB host. |
| 1595 | */ |
| 1596 | static int hub_port_suspend(struct usb_hub *hub, int port1, |
| 1597 | struct usb_device *udev) |
| 1598 | { |
| 1599 | int status; |
| 1600 | |
| 1601 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); |
| 1602 | |
| 1603 | /* enable remote wakeup when appropriate; this lets the device |
| 1604 | * wake up the upstream hub (including maybe the root hub). |
| 1605 | * |
| 1606 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when |
| 1607 | * we don't explicitly enable it here. |
| 1608 | */ |
David Brownell | b94dc6b | 2005-09-12 19:39:39 -0700 | [diff] [blame] | 1609 | if (device_may_wakeup(&udev->dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 1611 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
| 1612 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 1613 | NULL, 0, |
| 1614 | USB_CTRL_SET_TIMEOUT); |
| 1615 | if (status) |
| 1616 | dev_dbg(&udev->dev, |
| 1617 | "won't remote wakeup, status %d\n", |
| 1618 | status); |
| 1619 | } |
| 1620 | |
| 1621 | /* see 7.1.7.6 */ |
| 1622 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); |
| 1623 | if (status) { |
| 1624 | dev_dbg(hub->intfdev, |
| 1625 | "can't suspend port %d, status %d\n", |
| 1626 | port1, status); |
| 1627 | /* paranoia: "should not happen" */ |
| 1628 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 1629 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
| 1630 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 1631 | NULL, 0, |
| 1632 | USB_CTRL_SET_TIMEOUT); |
| 1633 | } else { |
| 1634 | /* device has up to 10 msec to fully suspend */ |
| 1635 | dev_dbg(&udev->dev, "usb suspend\n"); |
| 1636 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
| 1637 | msleep(10); |
| 1638 | } |
| 1639 | return status; |
| 1640 | } |
| 1641 | |
| 1642 | /* |
| 1643 | * Devices on USB hub ports have only one "suspend" state, corresponding |
Pavel Machek | ba9d35f | 2005-04-18 17:39:24 -0700 | [diff] [blame] | 1644 | * to ACPI D2, "may cause the device to lose some context". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | * State transitions include: |
| 1646 | * |
| 1647 | * - suspend, resume ... when the VBUS power link stays live |
| 1648 | * - suspend, disconnect ... VBUS lost |
| 1649 | * |
| 1650 | * Once VBUS drop breaks the circuit, the port it's using has to go through |
| 1651 | * normal re-enumeration procedures, starting with enabling VBUS power. |
| 1652 | * Other than re-initializing the hub (plug/unplug, except for root hubs), |
| 1653 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd |
| 1654 | * timer, no SRP, no requests through sysfs. |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1655 | * |
| 1656 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when |
| 1657 | * the root hub for their bus goes into global suspend ... so we don't |
| 1658 | * (falsely) update the device power state to say it suspended. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | */ |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1660 | static int __usb_suspend_device (struct usb_device *udev, int port1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | { |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1662 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | |
| 1664 | /* caller owns the udev device lock */ |
| 1665 | if (port1 < 0) |
| 1666 | return port1; |
| 1667 | |
| 1668 | if (udev->state == USB_STATE_SUSPENDED |
| 1669 | || udev->state == USB_STATE_NOTATTACHED) { |
| 1670 | return 0; |
| 1671 | } |
| 1672 | |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 1673 | /* all interfaces must already be suspended */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | if (udev->actconfig) { |
| 1675 | int i; |
| 1676 | |
| 1677 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 1678 | struct usb_interface *intf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | |
| 1680 | intf = udev->actconfig->interface[i]; |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 1681 | if (is_active(intf)) { |
| 1682 | dev_dbg(&intf->dev, "nyet suspended\n"); |
| 1683 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | } |
| 1685 | } |
| 1686 | } |
| 1687 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1688 | /* we only change a device's upstream USB link. |
| 1689 | * root hubs have no upstream USB link. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | */ |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1691 | if (udev->parent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | status = hub_port_suspend(hdev_to_hub(udev->parent), port1, |
| 1693 | udev); |
| 1694 | |
| 1695 | if (status == 0) |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1696 | udev->dev.power.power_state = PMSG_SUSPEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | return status; |
| 1698 | } |
| 1699 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1700 | #endif |
| 1701 | |
David Brownell | 5edbfb7 | 2005-09-22 22:45:26 -0700 | [diff] [blame] | 1702 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | * usb_suspend_device - suspend a usb device |
| 1704 | * @udev: device that's no longer in active use |
David Brownell | 5edbfb7 | 2005-09-22 22:45:26 -0700 | [diff] [blame] | 1705 | * Context: must be able to sleep; device not locked; pm locks held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | * |
| 1707 | * Suspends a USB device that isn't in active use, conserving power. |
| 1708 | * Devices may wake out of a suspend, if anything important happens, |
| 1709 | * using the remote wakeup mechanism. They may also be taken out of |
| 1710 | * suspend by the host, using usb_resume_device(). It's also routine |
| 1711 | * to disconnect devices while they are suspended. |
| 1712 | * |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1713 | * This only affects the USB hardware for a device; its interfaces |
| 1714 | * (and, for hubs, child devices) must already have been suspended. |
| 1715 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | * Suspending OTG devices may trigger HNP, if that's been enabled |
| 1717 | * between a pair of dual-role devices. That will change roles, such |
| 1718 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
| 1719 | * |
| 1720 | * Returns 0 on success, else negative errno. |
| 1721 | */ |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1722 | int usb_suspend_device(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | { |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1724 | #ifdef CONFIG_USB_SUSPEND |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1725 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1726 | return -ENODEV; |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 1727 | return __usb_suspend_device(udev, udev->portnum); |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1728 | #else |
| 1729 | /* NOTE: udev->state unchanged, it's not lying ... */ |
| 1730 | udev->dev.power.power_state = PMSG_SUSPEND; |
| 1731 | return 0; |
| 1732 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | /* |
David Brownell | 390a8c3 | 2005-09-13 19:57:27 -0700 | [diff] [blame] | 1736 | * If the USB "suspend" state is in use (rather than "global suspend"), |
| 1737 | * many devices will be individually taken out of suspend state using |
| 1738 | * special" resume" signaling. These routines kick in shortly after |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | * hardware resume signaling is finished, either because of selective |
| 1740 | * resume (by host) or remote wakeup (by device) ... now see what changed |
| 1741 | * in the tree that's rooted at this device. |
| 1742 | */ |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1743 | static int finish_device_resume(struct usb_device *udev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | { |
| 1745 | int status; |
| 1746 | u16 devstatus; |
| 1747 | |
| 1748 | /* caller owns the udev device lock */ |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1749 | dev_dbg(&udev->dev, "finish resume\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | |
| 1751 | /* usb ch9 identifies four variants of SUSPENDED, based on what |
| 1752 | * state the device resumes to. Linux currently won't see the |
| 1753 | * first two on the host side; they'd be inside hub_port_init() |
| 1754 | * during many timeouts, but khubd can't suspend until later. |
| 1755 | */ |
| 1756 | usb_set_device_state(udev, udev->actconfig |
| 1757 | ? USB_STATE_CONFIGURED |
| 1758 | : USB_STATE_ADDRESS); |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1759 | udev->dev.power.power_state = PMSG_ON; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | |
| 1761 | /* 10.5.4.5 says be sure devices in the tree are still there. |
| 1762 | * For now let's assume the device didn't go crazy on resume, |
| 1763 | * and device drivers will know about any resume quirks. |
| 1764 | */ |
| 1765 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1766 | if (status < 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | dev_dbg(&udev->dev, |
| 1768 | "gone after usb resume? status %d\n", |
| 1769 | status); |
| 1770 | else if (udev->actconfig) { |
| 1771 | unsigned i; |
David Brownell | dbc3887 | 2005-09-13 19:57:36 -0700 | [diff] [blame] | 1772 | int (*resume)(struct device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | |
| 1774 | le16_to_cpus(&devstatus); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 1775 | if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1776 | && udev->parent) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | status = usb_control_msg(udev, |
| 1778 | usb_sndctrlpipe(udev, 0), |
| 1779 | USB_REQ_CLEAR_FEATURE, |
| 1780 | USB_RECIP_DEVICE, |
| 1781 | USB_DEVICE_REMOTE_WAKEUP, 0, |
| 1782 | NULL, 0, |
| 1783 | USB_CTRL_SET_TIMEOUT); |
| 1784 | if (status) { |
| 1785 | dev_dbg(&udev->dev, "disable remote " |
| 1786 | "wakeup, status %d\n", status); |
| 1787 | status = 0; |
| 1788 | } |
| 1789 | } |
| 1790 | |
| 1791 | /* resume interface drivers; if this is a hub, it |
David Brownell | dbc3887 | 2005-09-13 19:57:36 -0700 | [diff] [blame] | 1792 | * may have a child resume event to deal with soon |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | */ |
David Brownell | dbc3887 | 2005-09-13 19:57:36 -0700 | [diff] [blame] | 1794 | resume = udev->dev.bus->resume; |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1795 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 1796 | struct device *dev = |
| 1797 | &udev->actconfig->interface[i]->dev; |
| 1798 | |
| 1799 | down(&dev->sem); |
| 1800 | (void) resume(dev); |
| 1801 | up(&dev->sem); |
| 1802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | status = 0; |
| 1804 | |
| 1805 | } else if (udev->devnum <= 0) { |
| 1806 | dev_dbg(&udev->dev, "bogus resume!\n"); |
| 1807 | status = -EINVAL; |
| 1808 | } |
| 1809 | return status; |
| 1810 | } |
| 1811 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1812 | #ifdef CONFIG_USB_SUSPEND |
| 1813 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | static int |
| 1815 | hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) |
| 1816 | { |
| 1817 | int status; |
| 1818 | |
| 1819 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); |
| 1820 | |
| 1821 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
| 1822 | status = clear_port_feature(hub->hdev, |
| 1823 | port1, USB_PORT_FEAT_SUSPEND); |
| 1824 | if (status) { |
| 1825 | dev_dbg(hub->intfdev, |
| 1826 | "can't resume port %d, status %d\n", |
| 1827 | port1, status); |
| 1828 | } else { |
| 1829 | u16 devstatus; |
| 1830 | u16 portchange; |
| 1831 | |
| 1832 | /* drive resume for at least 20 msec */ |
| 1833 | if (udev) |
| 1834 | dev_dbg(&udev->dev, "RESUME\n"); |
| 1835 | msleep(25); |
| 1836 | |
| 1837 | #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ |
| 1838 | | USB_PORT_STAT_ENABLE \ |
| 1839 | | USB_PORT_STAT_CONNECTION) |
| 1840 | |
| 1841 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
| 1842 | * stop resume signaling. Then finish the resume |
| 1843 | * sequence. |
| 1844 | */ |
| 1845 | devstatus = portchange = 0; |
| 1846 | status = hub_port_status(hub, port1, |
| 1847 | &devstatus, &portchange); |
| 1848 | if (status < 0 |
| 1849 | || (devstatus & LIVE_FLAGS) != LIVE_FLAGS |
| 1850 | || (devstatus & USB_PORT_STAT_SUSPEND) != 0 |
| 1851 | ) { |
| 1852 | dev_dbg(hub->intfdev, |
| 1853 | "port %d status %04x.%04x after resume, %d\n", |
| 1854 | port1, portchange, devstatus, status); |
| 1855 | } else { |
| 1856 | /* TRSMRCY = 10 msec */ |
| 1857 | msleep(10); |
| 1858 | if (udev) |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1859 | status = finish_device_resume(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | } |
| 1861 | } |
| 1862 | if (status < 0) |
| 1863 | hub_port_logical_disconnect(hub, port1); |
| 1864 | |
| 1865 | return status; |
| 1866 | } |
| 1867 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1868 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
David Brownell | 5edbfb7 | 2005-09-22 22:45:26 -0700 | [diff] [blame] | 1870 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | * usb_resume_device - re-activate a suspended usb device |
| 1872 | * @udev: device to re-activate |
David Brownell | 5edbfb7 | 2005-09-22 22:45:26 -0700 | [diff] [blame] | 1873 | * Context: must be able to sleep; device not locked; pm locks held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | * |
| 1875 | * This will re-activate the suspended device, increasing power usage |
| 1876 | * while letting drivers communicate again with its endpoints. |
| 1877 | * USB resume explicitly guarantees that the power session between |
| 1878 | * the host and the device is the same as it was when the device |
| 1879 | * suspended. |
| 1880 | * |
| 1881 | * Returns 0 on success, else negative errno. |
| 1882 | */ |
| 1883 | int usb_resume_device(struct usb_device *udev) |
| 1884 | { |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 1885 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1887 | if (udev->state == USB_STATE_NOTATTACHED) |
| 1888 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1890 | /* selective resume of one downstream hub-to-device port */ |
| 1891 | if (udev->parent) { |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1892 | #ifdef CONFIG_USB_SUSPEND |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1893 | if (udev->state == USB_STATE_SUSPENDED) { |
| 1894 | // NOTE swsusp may bork us, device state being wrong... |
| 1895 | // NOTE this fails if parent is also suspended... |
| 1896 | status = hub_port_resume(hdev_to_hub(udev->parent), |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 1897 | udev->portnum, udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | } else |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1899 | #endif |
Alan Stern | 43c5d5a | 2006-02-01 10:47:11 -0500 | [diff] [blame] | 1900 | status = 0; |
David Brownell | fb669cc | 2006-01-24 08:40:27 -0800 | [diff] [blame] | 1901 | } else |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1902 | status = finish_device_resume(udev); |
| 1903 | if (status < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | dev_dbg(&udev->dev, "can't resume, status %d\n", |
| 1905 | status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | /* rebind drivers that had no suspend() */ |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1908 | if (status == 0) { |
| 1909 | usb_unlock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | bus_rescan_devices(&usb_bus_type); |
Alan Stern | 4bf0ba8 | 2005-11-21 11:58:07 -0500 | [diff] [blame] | 1911 | usb_lock_device(udev); |
| 1912 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | return status; |
| 1914 | } |
| 1915 | |
| 1916 | static int remote_wakeup(struct usb_device *udev) |
| 1917 | { |
| 1918 | int status = 0; |
| 1919 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1920 | #ifdef CONFIG_USB_SUSPEND |
| 1921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | /* don't repeat RESUME sequence if this device |
| 1923 | * was already woken up by some other task |
| 1924 | */ |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1925 | usb_lock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | if (udev->state == USB_STATE_SUSPENDED) { |
| 1927 | dev_dbg(&udev->dev, "RESUME (wakeup)\n"); |
| 1928 | /* TRSMRCY = 10 msec */ |
| 1929 | msleep(10); |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1930 | status = finish_device_resume(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | } |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 1932 | usb_unlock_device(udev); |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1933 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | return status; |
| 1935 | } |
| 1936 | |
David Brownell | db69087 | 2005-09-13 19:56:33 -0700 | [diff] [blame] | 1937 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | { |
| 1939 | struct usb_hub *hub = usb_get_intfdata (intf); |
| 1940 | struct usb_device *hdev = hub->hdev; |
| 1941 | unsigned port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 1943 | /* fail if children aren't already suspended */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| 1945 | struct usb_device *udev; |
| 1946 | |
| 1947 | udev = hdev->children [port1-1]; |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1948 | if (udev && (udev->dev.power.power_state.event |
| 1949 | == PM_EVENT_ON |
| 1950 | #ifdef CONFIG_USB_SUSPEND |
| 1951 | || udev->state != USB_STATE_SUSPENDED |
| 1952 | #endif |
| 1953 | )) { |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 1954 | dev_dbg(&intf->dev, "port %d nyet suspended\n", port1); |
| 1955 | return -EBUSY; |
| 1956 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | } |
| 1958 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1959 | /* "global suspend" of the downstream HC-to-USB interface */ |
| 1960 | if (!hdev->parent) { |
| 1961 | struct usb_bus *bus = hdev->bus; |
Alan Stern | 0c0382e | 2005-10-13 17:08:02 -0400 | [diff] [blame] | 1962 | if (bus) { |
| 1963 | int status = hcd_bus_suspend (bus); |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1964 | |
| 1965 | if (status != 0) { |
| 1966 | dev_dbg(&hdev->dev, "'global' suspend %d\n", |
| 1967 | status); |
| 1968 | return status; |
| 1969 | } |
| 1970 | } else |
| 1971 | return -EOPNOTSUPP; |
| 1972 | } |
| 1973 | |
David Brownell | c9f89fa | 2005-09-13 19:57:04 -0700 | [diff] [blame] | 1974 | /* stop khubd and related activity */ |
| 1975 | hub_quiesce(hub); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | return 0; |
| 1977 | } |
| 1978 | |
| 1979 | static int hub_resume(struct usb_interface *intf) |
| 1980 | { |
| 1981 | struct usb_device *hdev = interface_to_usbdev(intf); |
| 1982 | struct usb_hub *hub = usb_get_intfdata (intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | int status; |
| 1984 | |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1985 | /* "global resume" of the downstream HC-to-USB interface */ |
| 1986 | if (!hdev->parent) { |
| 1987 | struct usb_bus *bus = hdev->bus; |
Alan Stern | 0c0382e | 2005-10-13 17:08:02 -0400 | [diff] [blame] | 1988 | if (bus) { |
| 1989 | status = hcd_bus_resume (bus); |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 1990 | if (status) { |
| 1991 | dev_dbg(&intf->dev, "'global' resume %d\n", |
| 1992 | status); |
| 1993 | return status; |
| 1994 | } |
| 1995 | } else |
| 1996 | return -EOPNOTSUPP; |
| 1997 | if (status == 0) { |
| 1998 | /* TRSMRCY = 10 msec */ |
| 1999 | msleep(10); |
| 2000 | } |
| 2001 | } |
| 2002 | |
| 2003 | hub_activate(hub); |
| 2004 | |
| 2005 | /* REVISIT: this recursion probably shouldn't exist. Remove |
| 2006 | * this code sometime, after retesting with different root and |
| 2007 | * external hubs. |
| 2008 | */ |
| 2009 | #ifdef CONFIG_USB_SUSPEND |
| 2010 | { |
| 2011 | unsigned port1; |
| 2012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
| 2014 | struct usb_device *udev; |
| 2015 | u16 portstat, portchange; |
| 2016 | |
| 2017 | udev = hdev->children [port1-1]; |
| 2018 | status = hub_port_status(hub, port1, &portstat, &portchange); |
| 2019 | if (status == 0) { |
| 2020 | if (portchange & USB_PORT_STAT_C_SUSPEND) { |
| 2021 | clear_port_feature(hdev, port1, |
| 2022 | USB_PORT_FEAT_C_SUSPEND); |
| 2023 | portchange &= ~USB_PORT_STAT_C_SUSPEND; |
| 2024 | } |
| 2025 | |
| 2026 | /* let khubd handle disconnects etc */ |
| 2027 | if (portchange) |
| 2028 | continue; |
| 2029 | } |
| 2030 | |
| 2031 | if (!udev || status < 0) |
| 2032 | continue; |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 2033 | usb_lock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | if (portstat & USB_PORT_STAT_SUSPEND) |
| 2035 | status = hub_port_resume(hub, port1, udev); |
| 2036 | else { |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 2037 | status = finish_device_resume(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | if (status < 0) { |
| 2039 | dev_dbg(&intf->dev, "resume port %d --> %d\n", |
| 2040 | port1, status); |
| 2041 | hub_port_logical_disconnect(hub, port1); |
| 2042 | } |
| 2043 | } |
Alan Stern | 9ad3d6c | 2005-11-17 17:10:32 -0500 | [diff] [blame] | 2044 | usb_unlock_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | } |
David Brownell | f3f3253 | 2005-09-22 22:37:29 -0700 | [diff] [blame] | 2046 | } |
| 2047 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | return 0; |
| 2049 | } |
| 2050 | |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2051 | void usb_suspend_root_hub(struct usb_device *hdev) |
| 2052 | { |
| 2053 | struct usb_hub *hub = hdev_to_hub(hdev); |
| 2054 | |
| 2055 | /* This also makes any led blinker stop retriggering. We're called |
| 2056 | * from irq, so the blinker might still be scheduled. Caller promises |
| 2057 | * that the root hub status URB will be canceled. |
| 2058 | */ |
| 2059 | __hub_quiesce(hub); |
| 2060 | mark_quiesced(to_usb_interface(hub->intfdev)); |
| 2061 | } |
| 2062 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | void usb_resume_root_hub(struct usb_device *hdev) |
| 2064 | { |
| 2065 | struct usb_hub *hub = hdev_to_hub(hdev); |
| 2066 | |
| 2067 | hub->resume_root_hub = 1; |
| 2068 | kick_khubd(hub); |
| 2069 | } |
| 2070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | |
| 2072 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
| 2073 | * |
| 2074 | * Between connect detection and reset signaling there must be a delay |
| 2075 | * of 100ms at least for debounce and power-settling. The corresponding |
| 2076 | * timer shall restart whenever the downstream port detects a disconnect. |
| 2077 | * |
| 2078 | * Apparently there are some bluetooth and irda-dongles and a number of |
| 2079 | * low-speed devices for which this debounce period may last over a second. |
| 2080 | * Not covered by the spec - but easy to deal with. |
| 2081 | * |
| 2082 | * This implementation uses a 1500ms total debounce timeout; if the |
| 2083 | * connection isn't stable by then it returns -ETIMEDOUT. It checks |
| 2084 | * every 25ms for transient disconnects. When the port status has been |
| 2085 | * unchanged for 100ms it returns the port status. |
| 2086 | */ |
| 2087 | |
| 2088 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
| 2089 | #define HUB_DEBOUNCE_STEP 25 |
| 2090 | #define HUB_DEBOUNCE_STABLE 100 |
| 2091 | |
| 2092 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
| 2093 | { |
| 2094 | int ret; |
| 2095 | int total_time, stable_time = 0; |
| 2096 | u16 portchange, portstatus; |
| 2097 | unsigned connection = 0xffff; |
| 2098 | |
| 2099 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
| 2100 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
| 2101 | if (ret < 0) |
| 2102 | return ret; |
| 2103 | |
| 2104 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
| 2105 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
| 2106 | stable_time += HUB_DEBOUNCE_STEP; |
| 2107 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
| 2108 | break; |
| 2109 | } else { |
| 2110 | stable_time = 0; |
| 2111 | connection = portstatus & USB_PORT_STAT_CONNECTION; |
| 2112 | } |
| 2113 | |
| 2114 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 2115 | clear_port_feature(hub->hdev, port1, |
| 2116 | USB_PORT_FEAT_C_CONNECTION); |
| 2117 | } |
| 2118 | |
| 2119 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
| 2120 | break; |
| 2121 | msleep(HUB_DEBOUNCE_STEP); |
| 2122 | } |
| 2123 | |
| 2124 | dev_dbg (hub->intfdev, |
| 2125 | "debounce: port %d: total %dms stable %dms status 0x%x\n", |
| 2126 | port1, total_time, stable_time, portstatus); |
| 2127 | |
| 2128 | if (stable_time < HUB_DEBOUNCE_STABLE) |
| 2129 | return -ETIMEDOUT; |
| 2130 | return portstatus; |
| 2131 | } |
| 2132 | |
| 2133 | static void ep0_reinit(struct usb_device *udev) |
| 2134 | { |
| 2135 | usb_disable_endpoint(udev, 0 + USB_DIR_IN); |
| 2136 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT); |
| 2137 | udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; |
| 2138 | } |
| 2139 | |
| 2140 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
| 2141 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
| 2142 | |
| 2143 | static int hub_set_address(struct usb_device *udev) |
| 2144 | { |
| 2145 | int retval; |
| 2146 | |
| 2147 | if (udev->devnum == 0) |
| 2148 | return -EINVAL; |
| 2149 | if (udev->state == USB_STATE_ADDRESS) |
| 2150 | return 0; |
| 2151 | if (udev->state != USB_STATE_DEFAULT) |
| 2152 | return -EINVAL; |
| 2153 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
| 2154 | USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, |
| 2155 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 2156 | if (retval == 0) { |
| 2157 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
| 2158 | ep0_reinit(udev); |
| 2159 | } |
| 2160 | return retval; |
| 2161 | } |
| 2162 | |
| 2163 | /* Reset device, (re)assign address, get device descriptor. |
| 2164 | * Device connection must be stable, no more debouncing needed. |
| 2165 | * Returns device in USB_STATE_ADDRESS, except on error. |
| 2166 | * |
| 2167 | * If this is called for an already-existing device (as part of |
| 2168 | * usb_reset_device), the caller must own the device lock. For a |
| 2169 | * newly detected device that is not accessible through any global |
| 2170 | * pointers, it's not necessary to lock the device. |
| 2171 | */ |
| 2172 | static int |
| 2173 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, |
| 2174 | int retry_counter) |
| 2175 | { |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2176 | static DEFINE_MUTEX(usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | |
| 2178 | struct usb_device *hdev = hub->hdev; |
| 2179 | int i, j, retval; |
| 2180 | unsigned delay = HUB_SHORT_RESET_TIME; |
| 2181 | enum usb_device_speed oldspeed = udev->speed; |
| 2182 | |
| 2183 | /* root hub ports have a slightly longer reset period |
| 2184 | * (from USB 2.0 spec, section 7.1.7.5) |
| 2185 | */ |
| 2186 | if (!hdev->parent) { |
| 2187 | delay = HUB_ROOT_RESET_TIME; |
| 2188 | if (port1 == hdev->bus->otg_port) |
| 2189 | hdev->bus->b_hnp_enable = 0; |
| 2190 | } |
| 2191 | |
| 2192 | /* Some low speed devices have problems with the quick delay, so */ |
| 2193 | /* be a bit pessimistic with those devices. RHbug #23670 */ |
| 2194 | if (oldspeed == USB_SPEED_LOW) |
| 2195 | delay = HUB_LONG_RESET_TIME; |
| 2196 | |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2197 | mutex_lock(&usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
| 2199 | /* Reset the device; full speed may morph to high speed */ |
| 2200 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2201 | if (retval < 0) /* error or disconnect */ |
| 2202 | goto fail; |
| 2203 | /* success, speed is known */ |
| 2204 | retval = -ENODEV; |
| 2205 | |
| 2206 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { |
| 2207 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
| 2208 | goto fail; |
| 2209 | } |
| 2210 | oldspeed = udev->speed; |
| 2211 | |
| 2212 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| 2213 | * it's fixed size except for full speed devices. |
| 2214 | */ |
| 2215 | switch (udev->speed) { |
| 2216 | case USB_SPEED_HIGH: /* fixed at 64 */ |
| 2217 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); |
| 2218 | break; |
| 2219 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| 2220 | /* to determine the ep0 maxpacket size, try to read |
| 2221 | * the device descriptor to get bMaxPacketSize0 and |
| 2222 | * then correct our initial guess. |
| 2223 | */ |
| 2224 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); |
| 2225 | break; |
| 2226 | case USB_SPEED_LOW: /* fixed at 8 */ |
| 2227 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); |
| 2228 | break; |
| 2229 | default: |
| 2230 | goto fail; |
| 2231 | } |
| 2232 | |
| 2233 | dev_info (&udev->dev, |
| 2234 | "%s %s speed USB device using %s and address %d\n", |
| 2235 | (udev->config) ? "reset" : "new", |
| 2236 | ({ char *speed; switch (udev->speed) { |
| 2237 | case USB_SPEED_LOW: speed = "low"; break; |
| 2238 | case USB_SPEED_FULL: speed = "full"; break; |
| 2239 | case USB_SPEED_HIGH: speed = "high"; break; |
| 2240 | default: speed = "?"; break; |
| 2241 | }; speed;}), |
| 2242 | udev->bus->controller->driver->name, |
| 2243 | udev->devnum); |
| 2244 | |
| 2245 | /* Set up TT records, if needed */ |
| 2246 | if (hdev->tt) { |
| 2247 | udev->tt = hdev->tt; |
| 2248 | udev->ttport = hdev->ttport; |
| 2249 | } else if (udev->speed != USB_SPEED_HIGH |
| 2250 | && hdev->speed == USB_SPEED_HIGH) { |
| 2251 | udev->tt = &hub->tt; |
| 2252 | udev->ttport = port1; |
| 2253 | } |
| 2254 | |
| 2255 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
| 2256 | * Because device hardware and firmware is sometimes buggy in |
| 2257 | * this area, and this is how Linux has done it for ages. |
| 2258 | * Change it cautiously. |
| 2259 | * |
| 2260 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing |
| 2261 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
| 2262 | * so it may help with some non-standards-compliant devices. |
| 2263 | * Otherwise we start with SET_ADDRESS and then try to read the |
| 2264 | * first 8 bytes of the device descriptor to get the ep0 maxpacket |
| 2265 | * value. |
| 2266 | */ |
| 2267 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { |
| 2268 | if (USE_NEW_SCHEME(retry_counter)) { |
| 2269 | struct usb_device_descriptor *buf; |
| 2270 | int r = 0; |
| 2271 | |
| 2272 | #define GET_DESCRIPTOR_BUFSIZE 64 |
| 2273 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
| 2274 | if (!buf) { |
| 2275 | retval = -ENOMEM; |
| 2276 | continue; |
| 2277 | } |
| 2278 | |
| 2279 | /* Use a short timeout the first time through, |
| 2280 | * so that recalcitrant full-speed devices with |
| 2281 | * 8- or 16-byte ep0-maxpackets won't slow things |
| 2282 | * down tremendously by NAKing the unexpectedly |
| 2283 | * early status stage. Also, retry on all errors; |
| 2284 | * some devices are flakey. |
| 2285 | */ |
| 2286 | for (j = 0; j < 3; ++j) { |
| 2287 | buf->bMaxPacketSize0 = 0; |
| 2288 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
| 2289 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 2290 | USB_DT_DEVICE << 8, 0, |
| 2291 | buf, GET_DESCRIPTOR_BUFSIZE, |
| 2292 | (i ? USB_CTRL_GET_TIMEOUT : 1000)); |
| 2293 | switch (buf->bMaxPacketSize0) { |
| 2294 | case 8: case 16: case 32: case 64: |
| 2295 | if (buf->bDescriptorType == |
| 2296 | USB_DT_DEVICE) { |
| 2297 | r = 0; |
| 2298 | break; |
| 2299 | } |
| 2300 | /* FALL THROUGH */ |
| 2301 | default: |
| 2302 | if (r == 0) |
| 2303 | r = -EPROTO; |
| 2304 | break; |
| 2305 | } |
| 2306 | if (r == 0) |
| 2307 | break; |
| 2308 | } |
| 2309 | udev->descriptor.bMaxPacketSize0 = |
| 2310 | buf->bMaxPacketSize0; |
| 2311 | kfree(buf); |
| 2312 | |
| 2313 | retval = hub_port_reset(hub, port1, udev, delay); |
| 2314 | if (retval < 0) /* error or disconnect */ |
| 2315 | goto fail; |
| 2316 | if (oldspeed != udev->speed) { |
| 2317 | dev_dbg(&udev->dev, |
| 2318 | "device reset changed speed!\n"); |
| 2319 | retval = -ENODEV; |
| 2320 | goto fail; |
| 2321 | } |
| 2322 | if (r) { |
| 2323 | dev_err(&udev->dev, "device descriptor " |
| 2324 | "read/%s, error %d\n", |
| 2325 | "64", r); |
| 2326 | retval = -EMSGSIZE; |
| 2327 | continue; |
| 2328 | } |
| 2329 | #undef GET_DESCRIPTOR_BUFSIZE |
| 2330 | } |
| 2331 | |
| 2332 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
| 2333 | retval = hub_set_address(udev); |
| 2334 | if (retval >= 0) |
| 2335 | break; |
| 2336 | msleep(200); |
| 2337 | } |
| 2338 | if (retval < 0) { |
| 2339 | dev_err(&udev->dev, |
| 2340 | "device not accepting address %d, error %d\n", |
| 2341 | udev->devnum, retval); |
| 2342 | goto fail; |
| 2343 | } |
| 2344 | |
| 2345 | /* cope with hardware quirkiness: |
| 2346 | * - let SET_ADDRESS settle, some device hardware wants it |
| 2347 | * - read ep0 maxpacket even for high and low speed, |
| 2348 | */ |
| 2349 | msleep(10); |
| 2350 | if (USE_NEW_SCHEME(retry_counter)) |
| 2351 | break; |
| 2352 | |
| 2353 | retval = usb_get_device_descriptor(udev, 8); |
| 2354 | if (retval < 8) { |
| 2355 | dev_err(&udev->dev, "device descriptor " |
| 2356 | "read/%s, error %d\n", |
| 2357 | "8", retval); |
| 2358 | if (retval >= 0) |
| 2359 | retval = -EMSGSIZE; |
| 2360 | } else { |
| 2361 | retval = 0; |
| 2362 | break; |
| 2363 | } |
| 2364 | } |
| 2365 | if (retval) |
| 2366 | goto fail; |
| 2367 | |
| 2368 | i = udev->descriptor.bMaxPacketSize0; |
| 2369 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
| 2370 | if (udev->speed != USB_SPEED_FULL || |
| 2371 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
| 2372 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 2373 | retval = -EMSGSIZE; |
| 2374 | goto fail; |
| 2375 | } |
| 2376 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
| 2377 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
| 2378 | ep0_reinit(udev); |
| 2379 | } |
| 2380 | |
| 2381 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
| 2382 | if (retval < (signed)sizeof(udev->descriptor)) { |
| 2383 | dev_err(&udev->dev, "device descriptor read/%s, error %d\n", |
| 2384 | "all", retval); |
| 2385 | if (retval >= 0) |
| 2386 | retval = -ENOMSG; |
| 2387 | goto fail; |
| 2388 | } |
| 2389 | |
| 2390 | retval = 0; |
| 2391 | |
| 2392 | fail: |
| 2393 | if (retval) |
| 2394 | hub_port_disable(hub, port1, 0); |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 2395 | mutex_unlock(&usb_address0_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | return retval; |
| 2397 | } |
| 2398 | |
| 2399 | static void |
| 2400 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) |
| 2401 | { |
| 2402 | struct usb_qualifier_descriptor *qual; |
| 2403 | int status; |
| 2404 | |
| 2405 | qual = kmalloc (sizeof *qual, SLAB_KERNEL); |
| 2406 | if (qual == NULL) |
| 2407 | return; |
| 2408 | |
| 2409 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, |
| 2410 | qual, sizeof *qual); |
| 2411 | if (status == sizeof *qual) { |
| 2412 | dev_info(&udev->dev, "not running at top speed; " |
| 2413 | "connect to a high speed hub\n"); |
| 2414 | /* hub LEDs are probably harder to miss than syslog */ |
| 2415 | if (hub->has_indicators) { |
| 2416 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
| 2417 | schedule_work (&hub->leds); |
| 2418 | } |
| 2419 | } |
Jesper Juhl | 1bc3c9e | 2005-04-18 17:39:34 -0700 | [diff] [blame] | 2420 | kfree(qual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2421 | } |
| 2422 | |
| 2423 | static unsigned |
| 2424 | hub_power_remaining (struct usb_hub *hub) |
| 2425 | { |
| 2426 | struct usb_device *hdev = hub->hdev; |
| 2427 | int remaining; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2428 | int port1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2430 | if (!hub->limited_power) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | return 0; |
| 2432 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2433 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
| 2434 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
| 2435 | struct usb_device *udev = hdev->children[port1 - 1]; |
| 2436 | int delta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | |
| 2438 | if (!udev) |
| 2439 | continue; |
| 2440 | |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2441 | /* Unconfigured devices may not use more than 100mA, |
| 2442 | * or 8mA for OTG ports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | if (udev->actconfig) |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2444 | delta = udev->actconfig->desc.bMaxPower * 2; |
| 2445 | else if (port1 != udev->bus->otg_port || hdev->parent) |
| 2446 | delta = 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | else |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2448 | delta = 8; |
| 2449 | if (delta > hub->mA_per_port) |
| 2450 | dev_warn(&udev->dev, "%dmA is over %umA budget " |
| 2451 | "for port %d!\n", |
| 2452 | delta, hub->mA_per_port, port1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | remaining -= delta; |
| 2454 | } |
| 2455 | if (remaining < 0) { |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2456 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
| 2457 | - remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | remaining = 0; |
| 2459 | } |
| 2460 | return remaining; |
| 2461 | } |
| 2462 | |
| 2463 | /* Handle physical or logical connection change events. |
| 2464 | * This routine is called when: |
| 2465 | * a port connection-change occurs; |
| 2466 | * a port enable-change occurs (often caused by EMI); |
| 2467 | * usb_reset_device() encounters changed descriptors (as from |
| 2468 | * a firmware download) |
| 2469 | * caller already locked the hub |
| 2470 | */ |
| 2471 | static void hub_port_connect_change(struct usb_hub *hub, int port1, |
| 2472 | u16 portstatus, u16 portchange) |
| 2473 | { |
| 2474 | struct usb_device *hdev = hub->hdev; |
| 2475 | struct device *hub_dev = hub->intfdev; |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2476 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | int status, i; |
| 2478 | |
| 2479 | dev_dbg (hub_dev, |
| 2480 | "port %d, status %04x, change %04x, %s\n", |
| 2481 | port1, portstatus, portchange, portspeed (portstatus)); |
| 2482 | |
| 2483 | if (hub->has_indicators) { |
| 2484 | set_port_led(hub, port1, HUB_LED_AUTO); |
| 2485 | hub->indicator[port1-1] = INDICATOR_AUTO; |
| 2486 | } |
| 2487 | |
| 2488 | /* Disconnect any existing devices under this port */ |
| 2489 | if (hdev->children[port1-1]) |
| 2490 | usb_disconnect(&hdev->children[port1-1]); |
| 2491 | clear_bit(port1, hub->change_bits); |
| 2492 | |
| 2493 | #ifdef CONFIG_USB_OTG |
| 2494 | /* during HNP, don't repeat the debounce */ |
| 2495 | if (hdev->bus->is_b_host) |
| 2496 | portchange &= ~USB_PORT_STAT_C_CONNECTION; |
| 2497 | #endif |
| 2498 | |
| 2499 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 2500 | status = hub_port_debounce(hub, port1); |
| 2501 | if (status < 0) { |
| 2502 | dev_err (hub_dev, |
| 2503 | "connect-debounce failed, port %d disabled\n", |
| 2504 | port1); |
| 2505 | goto done; |
| 2506 | } |
| 2507 | portstatus = status; |
| 2508 | } |
| 2509 | |
| 2510 | /* Return now if nothing is connected */ |
| 2511 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
| 2512 | |
| 2513 | /* maybe switch power back on (e.g. root hub was reset) */ |
Greg Kroah-Hartman | 74ad9bd | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2514 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
| 2516 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
| 2517 | |
| 2518 | if (portstatus & USB_PORT_STAT_ENABLE) |
| 2519 | goto done; |
| 2520 | return; |
| 2521 | } |
| 2522 | |
| 2523 | #ifdef CONFIG_USB_SUSPEND |
| 2524 | /* If something is connected, but the port is suspended, wake it up. */ |
| 2525 | if (portstatus & USB_PORT_STAT_SUSPEND) { |
| 2526 | status = hub_port_resume(hub, port1, NULL); |
| 2527 | if (status < 0) { |
| 2528 | dev_dbg(hub_dev, |
| 2529 | "can't clear suspend on port %d; %d\n", |
| 2530 | port1, status); |
| 2531 | goto done; |
| 2532 | } |
| 2533 | } |
| 2534 | #endif |
| 2535 | |
| 2536 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
| 2537 | struct usb_device *udev; |
| 2538 | |
| 2539 | /* reallocate for each attempt, since references |
| 2540 | * to the previous one can escape in various ways |
| 2541 | */ |
| 2542 | udev = usb_alloc_dev(hdev, hdev->bus, port1); |
| 2543 | if (!udev) { |
| 2544 | dev_err (hub_dev, |
| 2545 | "couldn't allocate port %d usb_device\n", |
| 2546 | port1); |
| 2547 | goto done; |
| 2548 | } |
| 2549 | |
| 2550 | usb_set_device_state(udev, USB_STATE_POWERED); |
| 2551 | udev->speed = USB_SPEED_UNKNOWN; |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2552 | udev->bus_mA = hub->mA_per_port; |
| 2553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | /* set the address */ |
| 2555 | choose_address(udev); |
| 2556 | if (udev->devnum <= 0) { |
| 2557 | status = -ENOTCONN; /* Don't retry */ |
| 2558 | goto loop; |
| 2559 | } |
| 2560 | |
| 2561 | /* reset and get descriptor */ |
| 2562 | status = hub_port_init(hub, udev, port1, i); |
| 2563 | if (status < 0) |
| 2564 | goto loop; |
| 2565 | |
| 2566 | /* consecutive bus-powered hubs aren't reliable; they can |
| 2567 | * violate the voltage drop budget. if the new child has |
| 2568 | * a "powered" LED, users should notice we didn't enable it |
| 2569 | * (without reading syslog), even without per-port LEDs |
| 2570 | * on the parent. |
| 2571 | */ |
| 2572 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2573 | && udev->bus_mA <= 100) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | u16 devstat; |
| 2575 | |
| 2576 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, |
| 2577 | &devstat); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2578 | if (status < 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
| 2580 | goto loop_disable; |
| 2581 | } |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2582 | le16_to_cpus(&devstat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
| 2584 | dev_err(&udev->dev, |
| 2585 | "can't connect bus-powered hub " |
| 2586 | "to this port\n"); |
| 2587 | if (hub->has_indicators) { |
| 2588 | hub->indicator[port1-1] = |
| 2589 | INDICATOR_AMBER_BLINK; |
| 2590 | schedule_work (&hub->leds); |
| 2591 | } |
| 2592 | status = -ENOTCONN; /* Don't retry */ |
| 2593 | goto loop_disable; |
| 2594 | } |
| 2595 | } |
| 2596 | |
| 2597 | /* check for devices running slower than they could */ |
| 2598 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
| 2599 | && udev->speed == USB_SPEED_FULL |
| 2600 | && highspeed_hubs != 0) |
| 2601 | check_highspeed (hub, udev, port1); |
| 2602 | |
| 2603 | /* Store the parent's children[] pointer. At this point |
| 2604 | * udev becomes globally accessible, although presumably |
| 2605 | * no one will look at it until hdev is unlocked. |
| 2606 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | status = 0; |
| 2608 | |
| 2609 | /* We mustn't add new devices if the parent hub has |
| 2610 | * been disconnected; we would race with the |
| 2611 | * recursively_mark_NOTATTACHED() routine. |
| 2612 | */ |
| 2613 | spin_lock_irq(&device_state_lock); |
| 2614 | if (hdev->state == USB_STATE_NOTATTACHED) |
| 2615 | status = -ENOTCONN; |
| 2616 | else |
| 2617 | hdev->children[port1-1] = udev; |
| 2618 | spin_unlock_irq(&device_state_lock); |
| 2619 | |
| 2620 | /* Run it through the hoops (find a driver, etc) */ |
| 2621 | if (!status) { |
| 2622 | status = usb_new_device(udev); |
| 2623 | if (status) { |
| 2624 | spin_lock_irq(&device_state_lock); |
| 2625 | hdev->children[port1-1] = NULL; |
| 2626 | spin_unlock_irq(&device_state_lock); |
| 2627 | } |
| 2628 | } |
| 2629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | if (status) |
| 2631 | goto loop_disable; |
| 2632 | |
| 2633 | status = hub_power_remaining(hub); |
| 2634 | if (status) |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2635 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2636 | |
| 2637 | return; |
| 2638 | |
| 2639 | loop_disable: |
| 2640 | hub_port_disable(hub, port1, 1); |
| 2641 | loop: |
| 2642 | ep0_reinit(udev); |
| 2643 | release_address(udev); |
| 2644 | usb_put_dev(udev); |
| 2645 | if (status == -ENOTCONN) |
| 2646 | break; |
| 2647 | } |
| 2648 | |
| 2649 | done: |
| 2650 | hub_port_disable(hub, port1, 1); |
| 2651 | } |
| 2652 | |
| 2653 | static void hub_events(void) |
| 2654 | { |
| 2655 | struct list_head *tmp; |
| 2656 | struct usb_device *hdev; |
| 2657 | struct usb_interface *intf; |
| 2658 | struct usb_hub *hub; |
| 2659 | struct device *hub_dev; |
| 2660 | u16 hubstatus; |
| 2661 | u16 hubchange; |
| 2662 | u16 portstatus; |
| 2663 | u16 portchange; |
| 2664 | int i, ret; |
| 2665 | int connect_change; |
| 2666 | |
| 2667 | /* |
| 2668 | * We restart the list every time to avoid a deadlock with |
| 2669 | * deleting hubs downstream from this one. This should be |
| 2670 | * safe since we delete the hub from the event list. |
| 2671 | * Not the most efficient, but avoids deadlocks. |
| 2672 | */ |
| 2673 | while (1) { |
| 2674 | |
| 2675 | /* Grab the first entry at the beginning of the list */ |
| 2676 | spin_lock_irq(&hub_event_lock); |
| 2677 | if (list_empty(&hub_event_list)) { |
| 2678 | spin_unlock_irq(&hub_event_lock); |
| 2679 | break; |
| 2680 | } |
| 2681 | |
| 2682 | tmp = hub_event_list.next; |
| 2683 | list_del_init(tmp); |
| 2684 | |
| 2685 | hub = list_entry(tmp, struct usb_hub, event_list); |
| 2686 | hdev = hub->hdev; |
| 2687 | intf = to_usb_interface(hub->intfdev); |
| 2688 | hub_dev = &intf->dev; |
| 2689 | |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2690 | i = hub->resume_root_hub; |
| 2691 | |
| 2692 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | hdev->state, hub->descriptor |
| 2694 | ? hub->descriptor->bNbrPorts |
| 2695 | : 0, |
| 2696 | /* NOTE: expects max 15 ports... */ |
| 2697 | (u16) hub->change_bits[0], |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2698 | (u16) hub->event_bits[0], |
| 2699 | i ? ", resume root" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | |
| 2701 | usb_get_intf(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | spin_unlock_irq(&hub_event_lock); |
| 2703 | |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2704 | /* Is this is a root hub wanting to reactivate the downstream |
| 2705 | * ports? If so, be sure the interface resumes even if its |
| 2706 | * stub "device" node was never suspended. |
| 2707 | */ |
| 2708 | if (i) { |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2709 | dpm_runtime_resume(&hdev->dev); |
| 2710 | dpm_runtime_resume(&intf->dev); |
Alan Stern | 2425e9f | 2005-11-29 12:13:31 -0500 | [diff] [blame] | 2711 | usb_put_intf(intf); |
| 2712 | continue; |
David Brownell | 979d519 | 2005-09-22 22:32:24 -0700 | [diff] [blame] | 2713 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | |
| 2715 | /* Lock the device, then check to see if we were |
| 2716 | * disconnected while waiting for the lock to succeed. */ |
| 2717 | if (locktree(hdev) < 0) { |
| 2718 | usb_put_intf(intf); |
| 2719 | continue; |
| 2720 | } |
| 2721 | if (hub != usb_get_intfdata(intf)) |
| 2722 | goto loop; |
| 2723 | |
| 2724 | /* If the hub has died, clean up after it */ |
| 2725 | if (hdev->state == USB_STATE_NOTATTACHED) { |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 2726 | hub_pre_reset(hub, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | goto loop; |
| 2728 | } |
| 2729 | |
| 2730 | /* If this is an inactive or suspended hub, do nothing */ |
| 2731 | if (hub->quiescing) |
| 2732 | goto loop; |
| 2733 | |
| 2734 | if (hub->error) { |
| 2735 | dev_dbg (hub_dev, "resetting for error %d\n", |
| 2736 | hub->error); |
| 2737 | |
| 2738 | ret = usb_reset_device(hdev); |
| 2739 | if (ret) { |
| 2740 | dev_dbg (hub_dev, |
| 2741 | "error resetting hub: %d\n", ret); |
| 2742 | goto loop; |
| 2743 | } |
| 2744 | |
| 2745 | hub->nerrors = 0; |
| 2746 | hub->error = 0; |
| 2747 | } |
| 2748 | |
| 2749 | /* deal with port status changes */ |
| 2750 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { |
| 2751 | if (test_bit(i, hub->busy_bits)) |
| 2752 | continue; |
| 2753 | connect_change = test_bit(i, hub->change_bits); |
| 2754 | if (!test_and_clear_bit(i, hub->event_bits) && |
| 2755 | !connect_change && !hub->activating) |
| 2756 | continue; |
| 2757 | |
| 2758 | ret = hub_port_status(hub, i, |
| 2759 | &portstatus, &portchange); |
| 2760 | if (ret < 0) |
| 2761 | continue; |
| 2762 | |
| 2763 | if (hub->activating && !hdev->children[i-1] && |
| 2764 | (portstatus & |
| 2765 | USB_PORT_STAT_CONNECTION)) |
| 2766 | connect_change = 1; |
| 2767 | |
| 2768 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
| 2769 | clear_port_feature(hdev, i, |
| 2770 | USB_PORT_FEAT_C_CONNECTION); |
| 2771 | connect_change = 1; |
| 2772 | } |
| 2773 | |
| 2774 | if (portchange & USB_PORT_STAT_C_ENABLE) { |
| 2775 | if (!connect_change) |
| 2776 | dev_dbg (hub_dev, |
| 2777 | "port %d enable change, " |
| 2778 | "status %08x\n", |
| 2779 | i, portstatus); |
| 2780 | clear_port_feature(hdev, i, |
| 2781 | USB_PORT_FEAT_C_ENABLE); |
| 2782 | |
| 2783 | /* |
| 2784 | * EM interference sometimes causes badly |
| 2785 | * shielded USB devices to be shutdown by |
| 2786 | * the hub, this hack enables them again. |
| 2787 | * Works at least with mouse driver. |
| 2788 | */ |
| 2789 | if (!(portstatus & USB_PORT_STAT_ENABLE) |
| 2790 | && !connect_change |
| 2791 | && hdev->children[i-1]) { |
| 2792 | dev_err (hub_dev, |
| 2793 | "port %i " |
| 2794 | "disabled by hub (EMI?), " |
| 2795 | "re-enabling...\n", |
| 2796 | i); |
| 2797 | connect_change = 1; |
| 2798 | } |
| 2799 | } |
| 2800 | |
| 2801 | if (portchange & USB_PORT_STAT_C_SUSPEND) { |
| 2802 | clear_port_feature(hdev, i, |
| 2803 | USB_PORT_FEAT_C_SUSPEND); |
| 2804 | if (hdev->children[i-1]) { |
| 2805 | ret = remote_wakeup(hdev-> |
| 2806 | children[i-1]); |
| 2807 | if (ret < 0) |
| 2808 | connect_change = 1; |
| 2809 | } else { |
| 2810 | ret = -ENODEV; |
| 2811 | hub_port_disable(hub, i, 1); |
| 2812 | } |
| 2813 | dev_dbg (hub_dev, |
| 2814 | "resume on port %d, status %d\n", |
| 2815 | i, ret); |
| 2816 | } |
| 2817 | |
| 2818 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
| 2819 | dev_err (hub_dev, |
| 2820 | "over-current change on port %d\n", |
| 2821 | i); |
| 2822 | clear_port_feature(hdev, i, |
| 2823 | USB_PORT_FEAT_C_OVER_CURRENT); |
| 2824 | hub_power_on(hub); |
| 2825 | } |
| 2826 | |
| 2827 | if (portchange & USB_PORT_STAT_C_RESET) { |
| 2828 | dev_dbg (hub_dev, |
| 2829 | "reset change on port %d\n", |
| 2830 | i); |
| 2831 | clear_port_feature(hdev, i, |
| 2832 | USB_PORT_FEAT_C_RESET); |
| 2833 | } |
| 2834 | |
| 2835 | if (connect_change) |
| 2836 | hub_port_connect_change(hub, i, |
| 2837 | portstatus, portchange); |
| 2838 | } /* end for i */ |
| 2839 | |
| 2840 | /* deal with hub status changes */ |
| 2841 | if (test_and_clear_bit(0, hub->event_bits) == 0) |
| 2842 | ; /* do nothing */ |
| 2843 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
| 2844 | dev_err (hub_dev, "get_hub_status failed\n"); |
| 2845 | else { |
| 2846 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
| 2847 | dev_dbg (hub_dev, "power change\n"); |
| 2848 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
Alan Stern | 55c5271 | 2005-11-23 12:03:12 -0500 | [diff] [blame] | 2849 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
| 2850 | /* FIXME: Is this always true? */ |
| 2851 | hub->limited_power = 0; |
| 2852 | else |
| 2853 | hub->limited_power = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | } |
| 2855 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
| 2856 | dev_dbg (hub_dev, "overcurrent change\n"); |
| 2857 | msleep(500); /* Cool down */ |
| 2858 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
| 2859 | hub_power_on(hub); |
| 2860 | } |
| 2861 | } |
| 2862 | |
| 2863 | hub->activating = 0; |
| 2864 | |
Alan Stern | d5926ae7 | 2005-04-21 15:56:37 -0400 | [diff] [blame] | 2865 | /* If this is a root hub, tell the HCD it's okay to |
| 2866 | * re-enable port-change interrupts now. */ |
| 2867 | if (!hdev->parent) |
| 2868 | usb_enable_root_hub_irq(hdev->bus); |
| 2869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2870 | loop: |
| 2871 | usb_unlock_device(hdev); |
| 2872 | usb_put_intf(intf); |
| 2873 | |
| 2874 | } /* end while (1) */ |
| 2875 | } |
| 2876 | |
| 2877 | static int hub_thread(void *__unused) |
| 2878 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2879 | do { |
| 2880 | hub_events(); |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 2881 | wait_event_interruptible(khubd_wait, |
| 2882 | !list_empty(&hub_event_list) || |
| 2883 | kthread_should_stop()); |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 2884 | try_to_freeze(); |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 2885 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 2887 | pr_debug("%s: khubd exiting\n", usbcore_name); |
| 2888 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | } |
| 2890 | |
| 2891 | static struct usb_device_id hub_id_table [] = { |
| 2892 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
| 2893 | .bDeviceClass = USB_CLASS_HUB}, |
| 2894 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
| 2895 | .bInterfaceClass = USB_CLASS_HUB}, |
| 2896 | { } /* Terminating entry */ |
| 2897 | }; |
| 2898 | |
| 2899 | MODULE_DEVICE_TABLE (usb, hub_id_table); |
| 2900 | |
| 2901 | static struct usb_driver hub_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | .name = "hub", |
| 2903 | .probe = hub_probe, |
| 2904 | .disconnect = hub_disconnect, |
| 2905 | .suspend = hub_suspend, |
| 2906 | .resume = hub_resume, |
| 2907 | .ioctl = hub_ioctl, |
| 2908 | .id_table = hub_id_table, |
| 2909 | }; |
| 2910 | |
| 2911 | int usb_hub_init(void) |
| 2912 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2913 | if (usb_register(&hub_driver) < 0) { |
| 2914 | printk(KERN_ERR "%s: can't register hub driver\n", |
| 2915 | usbcore_name); |
| 2916 | return -1; |
| 2917 | } |
| 2918 | |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 2919 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
| 2920 | if (!IS_ERR(khubd_task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2922 | |
| 2923 | /* Fall through if kernel_thread failed */ |
| 2924 | usb_deregister(&hub_driver); |
| 2925 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); |
| 2926 | |
| 2927 | return -1; |
| 2928 | } |
| 2929 | |
| 2930 | void usb_hub_cleanup(void) |
| 2931 | { |
akpm@osdl.org | 9c8d617 | 2005-06-20 14:29:58 -0700 | [diff] [blame] | 2932 | kthread_stop(khubd_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2933 | |
| 2934 | /* |
| 2935 | * Hub resources are freed for us by usb_deregister. It calls |
| 2936 | * usb_driver_purge on every device which in turn calls that |
| 2937 | * devices disconnect function if it is using this driver. |
| 2938 | * The hub_disconnect function takes care of releasing the |
| 2939 | * individual hub resources. -greg |
| 2940 | */ |
| 2941 | usb_deregister(&hub_driver); |
| 2942 | } /* usb_hub_cleanup() */ |
| 2943 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | static int config_descriptors_changed(struct usb_device *udev) |
| 2945 | { |
| 2946 | unsigned index; |
| 2947 | unsigned len = 0; |
| 2948 | struct usb_config_descriptor *buf; |
| 2949 | |
| 2950 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| 2951 | if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) |
| 2952 | len = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 2953 | } |
| 2954 | buf = kmalloc (len, SLAB_KERNEL); |
| 2955 | if (buf == NULL) { |
| 2956 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); |
| 2957 | /* assume the worst */ |
| 2958 | return 1; |
| 2959 | } |
| 2960 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
| 2961 | int length; |
| 2962 | int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
| 2963 | |
| 2964 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
| 2965 | old_length); |
| 2966 | if (length < old_length) { |
| 2967 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
| 2968 | index, length); |
| 2969 | break; |
| 2970 | } |
| 2971 | if (memcmp (buf, udev->rawdescriptors[index], old_length) |
| 2972 | != 0) { |
| 2973 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
| 2974 | index, buf->bConfigurationValue); |
| 2975 | break; |
| 2976 | } |
| 2977 | } |
| 2978 | kfree(buf); |
| 2979 | return index != udev->descriptor.bNumConfigurations; |
| 2980 | } |
| 2981 | |
| 2982 | /** |
| 2983 | * usb_reset_device - perform a USB port reset to reinitialize a device |
| 2984 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
| 2985 | * |
| 2986 | * WARNING - don't reset any device unless drivers for all of its |
| 2987 | * interfaces are expecting that reset! Maybe some driver->reset() |
| 2988 | * method should eventually help ensure sufficient cooperation. |
| 2989 | * |
| 2990 | * Do a port reset, reassign the device's address, and establish its |
| 2991 | * former operating configuration. If the reset fails, or the device's |
| 2992 | * descriptors change from their values before the reset, or the original |
| 2993 | * configuration and altsettings cannot be restored, a flag will be set |
| 2994 | * telling khubd to pretend the device has been disconnected and then |
| 2995 | * re-connected. All drivers will be unbound, and the device will be |
| 2996 | * re-enumerated and probed all over again. |
| 2997 | * |
| 2998 | * Returns 0 if the reset succeeded, -ENODEV if the device has been |
| 2999 | * flagged for logical disconnection, or some other negative error code |
| 3000 | * if the reset wasn't even attempted. |
| 3001 | * |
| 3002 | * The caller must own the device lock. For example, it's safe to use |
| 3003 | * this from a driver probe() routine after downloading new firmware. |
| 3004 | * For calls that might not occur during probe(), drivers should lock |
| 3005 | * the device using usb_lock_device_for_reset(). |
| 3006 | */ |
| 3007 | int usb_reset_device(struct usb_device *udev) |
| 3008 | { |
| 3009 | struct usb_device *parent_hdev = udev->parent; |
| 3010 | struct usb_hub *parent_hub; |
| 3011 | struct usb_device_descriptor descriptor = udev->descriptor; |
| 3012 | struct usb_hub *hub = NULL; |
Alan Stern | 12c3da3 | 2005-11-23 12:09:52 -0500 | [diff] [blame] | 3013 | int i, ret = 0; |
| 3014 | int port1 = udev->portnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | |
| 3016 | if (udev->state == USB_STATE_NOTATTACHED || |
| 3017 | udev->state == USB_STATE_SUSPENDED) { |
| 3018 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
| 3019 | udev->state); |
| 3020 | return -EINVAL; |
| 3021 | } |
| 3022 | |
| 3023 | if (!parent_hdev) { |
| 3024 | /* this requires hcd-specific logic; see OHCI hc_restart() */ |
| 3025 | dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); |
| 3026 | return -EISDIR; |
| 3027 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | parent_hub = hdev_to_hub(parent_hdev); |
| 3029 | |
| 3030 | /* If we're resetting an active hub, take some special actions */ |
Alan Stern | 6aa3567 | 2006-03-08 15:14:09 -0500 | [diff] [blame] | 3031 | if (udev->actconfig && udev->actconfig->desc.bNumInterfaces > 0 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | udev->actconfig->interface[0]->dev.driver == |
| 3033 | &hub_driver.driver && |
| 3034 | (hub = hdev_to_hub(udev)) != NULL) { |
Alan Stern | 7d069b7 | 2005-11-18 12:06:34 -0500 | [diff] [blame] | 3035 | hub_pre_reset(hub, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | } |
| 3037 | |
| 3038 | set_bit(port1, parent_hub->busy_bits); |
| 3039 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
| 3040 | |
| 3041 | /* ep0 maxpacket size may change; let the HCD know about it. |
| 3042 | * Other endpoints will be handled by re-enumeration. */ |
| 3043 | ep0_reinit(udev); |
| 3044 | ret = hub_port_init(parent_hub, udev, port1, i); |
| 3045 | if (ret >= 0) |
| 3046 | break; |
| 3047 | } |
| 3048 | clear_bit(port1, parent_hub->busy_bits); |
| 3049 | if (ret < 0) |
| 3050 | goto re_enumerate; |
| 3051 | |
| 3052 | /* Device might have changed firmware (DFU or similar) */ |
| 3053 | if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) |
| 3054 | || config_descriptors_changed (udev)) { |
| 3055 | dev_info(&udev->dev, "device firmware changed\n"); |
| 3056 | udev->descriptor = descriptor; /* for disconnect() calls */ |
| 3057 | goto re_enumerate; |
| 3058 | } |
| 3059 | |
| 3060 | if (!udev->actconfig) |
| 3061 | goto done; |
| 3062 | |
| 3063 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 3064 | USB_REQ_SET_CONFIGURATION, 0, |
| 3065 | udev->actconfig->desc.bConfigurationValue, 0, |
| 3066 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 3067 | if (ret < 0) { |
| 3068 | dev_err(&udev->dev, |
| 3069 | "can't restore configuration #%d (error=%d)\n", |
| 3070 | udev->actconfig->desc.bConfigurationValue, ret); |
| 3071 | goto re_enumerate; |
| 3072 | } |
| 3073 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
| 3074 | |
| 3075 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
| 3076 | struct usb_interface *intf = udev->actconfig->interface[i]; |
| 3077 | struct usb_interface_descriptor *desc; |
| 3078 | |
| 3079 | /* set_interface resets host side toggle even |
| 3080 | * for altsetting zero. the interface may have no driver. |
| 3081 | */ |
| 3082 | desc = &intf->cur_altsetting->desc; |
| 3083 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
| 3084 | desc->bAlternateSetting); |
| 3085 | if (ret < 0) { |
| 3086 | dev_err(&udev->dev, "failed to restore interface %d " |
| 3087 | "altsetting %d (error=%d)\n", |
| 3088 | desc->bInterfaceNumber, |
| 3089 | desc->bAlternateSetting, |
| 3090 | ret); |
| 3091 | goto re_enumerate; |
| 3092 | } |
| 3093 | } |
| 3094 | |
| 3095 | done: |
| 3096 | if (hub) |
| 3097 | hub_post_reset(hub); |
| 3098 | return 0; |
| 3099 | |
| 3100 | re_enumerate: |
| 3101 | hub_port_logical_disconnect(parent_hub, port1); |
| 3102 | return -ENODEV; |
| 3103 | } |