drivers/usb/core/hub.c

   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>
  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>
  24 #include <linux/kthread.h>
  25 #include <linux/mutex.h>
  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
  36  * Note: Both are also protected by ->dev.sem, except that ->state can
  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
  47 static struct task_struct *khubd_task;
  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);
 380                 kfree(clear);
 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;
 434         unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
 435         u16 wHubCharacteristics =
 436                         le16_to_cpu(hub->descriptor->wHubCharacteristics);
 437
 438         /* Enable power on each port.  Some hubs have reserved values
 439          * of LPSM (> 2) in their descriptors, even though they are
 440          * USB 2.0 hubs.  Some hubs do not implement port-power switching
 441          * but only emulate it.  In all cases, the ports won't work
 442          * unless we send these messages to the hub.
 443          */
 444         if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
 445                 dev_dbg(hub->intfdev, "enabling power on all ports\n");
 446         else
 447                 dev_dbg(hub->intfdev, "trying to enable port power on "
 448                                 "non-switchable hub\n");
 449         for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
 450                 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
 451
 452         /* Wait at least 100 msec for power to become stable */
 453         msleep(max(pgood_delay, (unsigned) 100));
 454 }
 455
 456 static inline void __hub_quiesce(struct usb_hub *hub)
 457 {
 458         /* (nonblocking) khubd and related activity won't re-trigger */
 459         hub->quiescing = 1;
 460         hub->activating = 0;
 461         hub->resume_root_hub = 0;
 462 }
 463
 464 static void hub_quiesce(struct usb_hub *hub)
 465 {
 466         /* (blocking) stop khubd and related activity */
 467         __hub_quiesce(hub);
 468         usb_kill_urb(hub->urb);
 469         if (hub->has_indicators)
 470                 cancel_delayed_work(&hub->leds);
 471         if (hub->has_indicators || hub->tt.hub)
 472                 flush_scheduled_work();
 473 }
 474
 475 static void hub_activate(struct usb_hub *hub)
 476 {
 477         int     status;
 478
 479         hub->quiescing = 0;
 480         hub->activating = 1;
 481         hub->resume_root_hub = 0;
 482         status = usb_submit_urb(hub->urb, GFP_NOIO);
 483         if (status < 0)
 484                 dev_err(hub->intfdev, "activate --> %d\n", status);
 485         if (hub->has_indicators && blinkenlights)
 486                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
 487
 488         /* scan all ports ASAP */
 489         kick_khubd(hub);
 490 }
 491
 492 static int hub_hub_status(struct usb_hub *hub,
 493                 u16 *status, u16 *change)
 494 {
 495         int ret;
 496
 497         ret = get_hub_status(hub->hdev, &hub->status->hub);
 498         if (ret < 0)
 499                 dev_err (hub->intfdev,
 500                         "%s failed (err = %d)\n", __FUNCTION__, ret);
 501         else {
 502                 *status = le16_to_cpu(hub->status->hub.wHubStatus);
 503                 *change = le16_to_cpu(hub->status->hub.wHubChange);
 504                 ret = 0;
 505         }
 506         return ret;
 507 }
 508
 509 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
 510 {
 511         struct usb_device *hdev = hub->hdev;
 512         int ret;
 513
 514         if (hdev->children[port1-1] && set_state) {
 515                 usb_set_device_state(hdev->children[port1-1],
 516                                 USB_STATE_NOTATTACHED);
 517         }
 518         ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
 519         if (ret)
 520                 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
 521                         port1, ret);
 522
 523         return ret;
 524 }
 525
 526
 527 /* caller has locked the hub device */
 528 static void hub_pre_reset(struct usb_interface *intf)
 529 {
 530         struct usb_hub *hub = usb_get_intfdata(intf);
 531         struct usb_device *hdev = hub->hdev;
 532         int port1;
 533
 534         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
 535                 if (hdev->children[port1 - 1]) {
 536                         usb_disconnect(&hdev->children[port1 - 1]);
 537                         if (hub->error == 0)
 538                                 hub_port_disable(hub, port1, 0);
 539                 }
 540         }
 541         hub_quiesce(hub);
 542 }
 543
 544 /* caller has locked the hub device */
 545 static void hub_post_reset(struct usb_interface *intf)
 546 {
 547         struct usb_hub *hub = usb_get_intfdata(intf);
 548
 549         hub_activate(hub);
 550         hub_power_on(hub);
 551 }
 552
 553
 554 static int hub_configure(struct usb_hub *hub,
 555         struct usb_endpoint_descriptor *endpoint)
 556 {
 557         struct usb_device *hdev = hub->hdev;
 558         struct device *hub_dev = hub->intfdev;
 559         u16 hubstatus, hubchange;
 560         u16 wHubCharacteristics;
 561         unsigned int pipe;
 562         int maxp, ret;
 563         char *message;
 564
 565         hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
 566                         &hub->buffer_dma);
 567         if (!hub->buffer) {
 568                 message = "can't allocate hub irq buffer";
 569                 ret = -ENOMEM;
 570                 goto fail;
 571         }
 572
 573         hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
 574         if (!hub->status) {
 575                 message = "can't kmalloc hub status buffer";
 576                 ret = -ENOMEM;
 577                 goto fail;
 578         }
 579
 580         hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
 581         if (!hub->descriptor) {
 582                 message = "can't kmalloc hub descriptor";
 583                 ret = -ENOMEM;
 584                 goto fail;
 585         }
 586
 587         /* Request the entire hub descriptor.
 588          * hub->descriptor can handle USB_MAXCHILDREN ports,
 589          * but the hub can/will return fewer bytes here.
 590          */
 591         ret = get_hub_descriptor(hdev, hub->descriptor,
 592                         sizeof(*hub->descriptor));
 593         if (ret < 0) {
 594                 message = "can't read hub descriptor";
 595                 goto fail;
 596         } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
 597                 message = "hub has too many ports!";
 598                 ret = -ENODEV;
 599                 goto fail;
 600         }
 601
 602         hdev->maxchild = hub->descriptor->bNbrPorts;
 603         dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
 604                 (hdev->maxchild == 1) ? "" : "s");
 605
 606         wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
 607
 608         if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
 609                 int     i;
 610                 char    portstr [USB_MAXCHILDREN + 1];
 611
 612                 for (i = 0; i < hdev->maxchild; i++)
 613                         portstr[i] = hub->descriptor->DeviceRemovable
 614                                     [((i + 1) / 8)] & (1 << ((i + 1) % 8))
 615                                 ? 'F' : 'R';
 616                 portstr[hdev->maxchild] = 0;
 617                 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
 618         } else
 619                 dev_dbg(hub_dev, "standalone hub\n");
 620
 621         switch (wHubCharacteristics & HUB_CHAR_LPSM) {
 622                 case 0x00:
 623                         dev_dbg(hub_dev, "ganged power switching\n");
 624                         break;
 625                 case 0x01:
 626                         dev_dbg(hub_dev, "individual port power switching\n");
 627                         break;
 628                 case 0x02:
 629                 case 0x03:
 630                         dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
 631                         break;
 632         }
 633
 634         switch (wHubCharacteristics & HUB_CHAR_OCPM) {
 635                 case 0x00:
 636                         dev_dbg(hub_dev, "global over-current protection\n");
 637                         break;
 638                 case 0x08:
 639                         dev_dbg(hub_dev, "individual port over-current protection\n");
 640                         break;
 641                 case 0x10:
 642                 case 0x18:
 643                         dev_dbg(hub_dev, "no over-current protection\n");
 644                         break;
 645         }
 646
 647         spin_lock_init (&hub->tt.lock);
 648         INIT_LIST_HEAD (&hub->tt.clear_list);
 649         INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
 650         switch (hdev->descriptor.bDeviceProtocol) {
 651                 case 0:
 652                         break;
 653                 case 1:
 654                         dev_dbg(hub_dev, "Single TT\n");
 655                         hub->tt.hub = hdev;
 656                         break;
 657                 case 2:
 658                         ret = usb_set_interface(hdev, 0, 1);
 659                         if (ret == 0) {
 660                                 dev_dbg(hub_dev, "TT per port\n");
 661                                 hub->tt.multi = 1;
 662                         } else
 663                                 dev_err(hub_dev, "Using single TT (err %d)\n",
 664                                         ret);
 665                         hub->tt.hub = hdev;
 666                         break;
 667                 default:
 668                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
 669                                 hdev->descriptor.bDeviceProtocol);
 670                         break;
 671         }
 672
 673         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
 674         switch (wHubCharacteristics & HUB_CHAR_TTTT) {
 675                 case HUB_TTTT_8_BITS:
 676                         if (hdev->descriptor.bDeviceProtocol != 0) {
 677                                 hub->tt.think_time = 666;
 678                                 dev_dbg(hub_dev, "TT requires at most %d "
 679                                                 "FS bit times (%d ns)\n",
 680                                         8, hub->tt.think_time);
 681                         }
 682                         break;
 683                 case HUB_TTTT_16_BITS:
 684                         hub->tt.think_time = 666 * 2;
 685                         dev_dbg(hub_dev, "TT requires at most %d "
 686                                         "FS bit times (%d ns)\n",
 687                                 16, hub->tt.think_time);
 688                         break;
 689                 case HUB_TTTT_24_BITS:
 690                         hub->tt.think_time = 666 * 3;
 691                         dev_dbg(hub_dev, "TT requires at most %d "
 692                                         "FS bit times (%d ns)\n",
 693                                 24, hub->tt.think_time);
 694                         break;
 695                 case HUB_TTTT_32_BITS:
 696                         hub->tt.think_time = 666 * 4;
 697                         dev_dbg(hub_dev, "TT requires at most %d "
 698                                         "FS bit times (%d ns)\n",
 699                                 32, hub->tt.think_time);
 700                         break;
 701         }
 702
 703         /* probe() zeroes hub->indicator[] */
 704         if (wHubCharacteristics & HUB_CHAR_PORTIND) {
 705                 hub->has_indicators = 1;
 706                 dev_dbg(hub_dev, "Port indicators are supported\n");
 707         }
 708
 709         dev_dbg(hub_dev, "power on to power good time: %dms\n",
 710                 hub->descriptor->bPwrOn2PwrGood * 2);
 711
 712         /* power budgeting mostly matters with bus-powered hubs,
 713          * and battery-powered root hubs (may provide just 8 mA).
 714          */
 715         ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
 716         if (ret < 2) {
 717                 message = "can't get hub status";
 718                 goto fail;
 719         }
 720         le16_to_cpus(&hubstatus);
 721         if (hdev == hdev->bus->root_hub) {
 722                 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
 723                         hub->mA_per_port = 500;
 724                 else {
 725                         hub->mA_per_port = hdev->bus_mA;
 726                         hub->limited_power = 1;
 727                 }
 728         } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
 729                 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
 730                         hub->descriptor->bHubContrCurrent);
 731                 hub->limited_power = 1;
 732                 if (hdev->maxchild > 0) {
 733                         int remaining = hdev->bus_mA -
 734                                         hub->descriptor->bHubContrCurrent;
 735
 736                         if (remaining < hdev->maxchild * 100)
 737                                 dev_warn(hub_dev,
 738                                         "insufficient power available "
 739                                         "to use all downstream ports\n");
 740                         hub->mA_per_port = 100;         /* 7.2.1.1 */
 741                 }
 742         } else {        /* Self-powered external hub */
 743                 /* FIXME: What about battery-powered external hubs that
 744                  * provide less current per port? */
 745                 hub->mA_per_port = 500;
 746         }
 747         if (hub->mA_per_port < 500)
 748                 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
 749                                 hub->mA_per_port);
 750
 751         ret = hub_hub_status(hub, &hubstatus, &hubchange);
 752         if (ret < 0) {
 753                 message = "can't get hub status";
 754                 goto fail;
 755         }
 756
 757         /* local power status reports aren't always correct */
 758         if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
 759                 dev_dbg(hub_dev, "local power source is %s\n",
 760                         (hubstatus & HUB_STATUS_LOCAL_POWER)
 761                         ? "lost (inactive)" : "good");
 762
 763         if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
 764                 dev_dbg(hub_dev, "%sover-current condition exists\n",
 765                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
 766
 767         /* set up the interrupt endpoint */
 768         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
 769         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
 770
 771         if (maxp > sizeof(*hub->buffer))
 772                 maxp = sizeof(*hub->buffer);
 773
 774         hub->urb = usb_alloc_urb(0, GFP_KERNEL);
 775         if (!hub->urb) {
 776                 message = "couldn't allocate interrupt urb";
 777                 ret = -ENOMEM;
 778                 goto fail;
 779         }
 780
 781         usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
 782                 hub, endpoint->bInterval);
 783         hub->urb->transfer_dma = hub->buffer_dma;
 784         hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 785
 786         /* maybe cycle the hub leds */
 787         if (hub->has_indicators && blinkenlights)
 788                 hub->indicator [0] = INDICATOR_CYCLE;
 789
 790         hub_power_on(hub);
 791         hub_activate(hub);
 792         return 0;
 793
 794 fail:
 795         dev_err (hub_dev, "config failed, %s (err %d)\n",
 796                         message, ret);
 797         /* hub_disconnect() frees urb and descriptor */
 798         return ret;
 799 }
 800
 801 static unsigned highspeed_hubs;
 802
 803 static void hub_disconnect(struct usb_interface *intf)
 804 {
 805         struct usb_hub *hub = usb_get_intfdata (intf);
 806         struct usb_device *hdev;
 807
 808         /* Disconnect all children and quiesce the hub */
 809         hub->error = 0;
 810         hub_pre_reset(intf);
 811
 812         usb_set_intfdata (intf, NULL);
 813         hdev = hub->hdev;
 814
 815         if (hdev->speed == USB_SPEED_HIGH)
 816                 highspeed_hubs--;
 817
 818         usb_free_urb(hub->urb);
 819         hub->urb = NULL;
 820
 821         spin_lock_irq(&hub_event_lock);
 822         list_del_init(&hub->event_list);
 823         spin_unlock_irq(&hub_event_lock);
 824
 825         kfree(hub->descriptor);
 826         hub->descriptor = NULL;
 827
 828         kfree(hub->status);
 829         hub->status = NULL;
 830
 831         if (hub->buffer) {
 832                 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
 833                                 hub->buffer_dma);
 834                 hub->buffer = NULL;
 835         }
 836
 837         kfree(hub);
 838 }
 839
 840 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
 841 {
 842         struct usb_host_interface *desc;
 843         struct usb_endpoint_descriptor *endpoint;
 844         struct usb_device *hdev;
 845         struct usb_hub *hub;
 846
 847         desc = intf->cur_altsetting;
 848         hdev = interface_to_usbdev(intf);
 849
 850 #ifdef  CONFIG_USB_OTG_BLACKLIST_HUB
 851         if (hdev->parent) {
 852                 dev_warn(&intf->dev, "ignoring external hub\n");
 853                 return -ENODEV;
 854         }
 855 #endif
 856
 857         /* Some hubs have a subclass of 1, which AFAICT according to the */
 858         /*  specs is not defined, but it works */
 859         if ((desc->desc.bInterfaceSubClass != 0) &&
 860             (desc->desc.bInterfaceSubClass != 1)) {
 861 descriptor_error:
 862                 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
 863                 return -EIO;
 864         }
 865
 866         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
 867         if (desc->desc.bNumEndpoints != 1)
 868                 goto descriptor_error;
 869
 870         endpoint = &desc->endpoint[0].desc;
 871
 872         /* Output endpoint? Curiouser and curiouser.. */
 873         if (!(endpoint->bEndpointAddress & USB_DIR_IN))
 874                 goto descriptor_error;
 875
 876         /* If it's not an interrupt endpoint, we'd better punt! */
 877         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 878                         != USB_ENDPOINT_XFER_INT)
 879                 goto descriptor_error;
 880
 881         /* We found a hub */
 882         dev_info (&intf->dev, "USB hub found\n");
 883
 884         hub = kzalloc(sizeof(*hub), GFP_KERNEL);
 885         if (!hub) {
 886                 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
 887                 return -ENOMEM;
 888         }
 889
 890         INIT_LIST_HEAD(&hub->event_list);
 891         hub->intfdev = &intf->dev;
 892         hub->hdev = hdev;
 893         INIT_WORK(&hub->leds, led_work, hub);
 894
 895         usb_set_intfdata (intf, hub);
 896
 897         if (hdev->speed == USB_SPEED_HIGH)
 898                 highspeed_hubs++;
 899
 900         if (hub_configure(hub, endpoint) >= 0)
 901                 return 0;
 902
 903         hub_disconnect (intf);
 904         return -ENODEV;
 905 }
 906
 907 static int
 908 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
 909 {
 910         struct usb_device *hdev = interface_to_usbdev (intf);
 911
 912         /* assert ifno == 0 (part of hub spec) */
 913         switch (code) {
 914         case USBDEVFS_HUB_PORTINFO: {
 915                 struct usbdevfs_hub_portinfo *info = user_data;
 916                 int i;
 917
 918                 spin_lock_irq(&device_state_lock);
 919                 if (hdev->devnum <= 0)
 920                         info->nports = 0;
 921                 else {
 922                         info->nports = hdev->maxchild;
 923                         for (i = 0; i < info->nports; i++) {
 924                                 if (hdev->children[i] == NULL)
 925                                         info->port[i] = 0;
 926                                 else
 927                                         info->port[i] =
 928                                                 hdev->children[i]->devnum;
 929                         }
 930                 }
 931                 spin_unlock_irq(&device_state_lock);
 932
 933                 return info->nports + 1;
 934                 }
 935
 936         default:
 937                 return -ENOSYS;
 938         }
 939 }
 940
 941
 942 /* grab device/port lock, returning index of that port (zero based).
 943  * protects the upstream link used by this device from concurrent
 944  * tree operations like suspend, resume, reset, and disconnect, which
 945  * apply to everything downstream of a given port.
 946  */
 947 static int locktree(struct usb_device *udev)
 948 {
 949         int                     t;
 950         struct usb_device       *hdev;
 951
 952         if (!udev)
 953                 return -ENODEV;
 954
 955         /* root hub is always the first lock in the series */
 956         hdev = udev->parent;
 957         if (!hdev) {
 958                 usb_lock_device(udev);
 959                 return 0;
 960         }
 961
 962         /* on the path from root to us, lock everything from
 963          * top down, dropping parent locks when not needed
 964          */
 965         t = locktree(hdev);
 966         if (t < 0)
 967                 return t;
 968
 969         /* everything is fail-fast once disconnect
 970          * processing starts
 971          */
 972         if (udev->state == USB_STATE_NOTATTACHED) {
 973                 usb_unlock_device(hdev);
 974                 return -ENODEV;
 975         }
 976
 977         /* when everyone grabs locks top->bottom,
 978          * non-overlapping work may be concurrent
 979          */
 980         usb_lock_device(udev);
 981         usb_unlock_device(hdev);
 982         return udev->portnum;
 983 }
 984
 985 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
 986 {
 987         int i;
 988
 989         for (i = 0; i < udev->maxchild; ++i) {
 990                 if (udev->children[i])
 991                         recursively_mark_NOTATTACHED(udev->children[i]);
 992         }
 993         udev->state = USB_STATE_NOTATTACHED;
 994 }
 995
 996 /**
 997  * usb_set_device_state - change a device's current state (usbcore, hcds)
 998  * @udev: pointer to device whose state should be changed
 999  * @new_state: new state value to be stored
1000  *
1001  * udev->state is _not_ fully protected by the device lock.  Although
1002  * most transitions are made only while holding the lock, the state can
1003  * can change to USB_STATE_NOTATTACHED at almost any time.  This
1004  * is so that devices can be marked as disconnected as soon as possible,
1005  * without having to wait for any semaphores to be released.  As a result,
1006  * all changes to any device's state must be protected by the
1007  * device_state_lock spinlock.
1008  *
1009  * Once a device has been added to the device tree, all changes to its state
1010  * should be made using this routine.  The state should _not_ be set directly.
1011  *
1012  * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1013  * Otherwise udev->state is set to new_state, and if new_state is
1014  * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1015  * to USB_STATE_NOTATTACHED.
1016  */
1017 void usb_set_device_state(struct usb_device *udev,
1018                 enum usb_device_state new_state)
1019 {
1020         unsigned long flags;
1021
1022         spin_lock_irqsave(&device_state_lock, flags);
1023         if (udev->state == USB_STATE_NOTATTACHED)
1024                 ;       /* do nothing */
1025         else if (new_state != USB_STATE_NOTATTACHED) {
1026                 udev->state = new_state;
1027
1028                 /* root hub wakeup capabilities are managed out-of-band
1029                  * and may involve silicon errata ... ignore them here.
1030                  */
1031                 if (udev->parent) {
1032                         if (new_state == USB_STATE_CONFIGURED)
1033                                 device_init_wakeup(&udev->dev,
1034                                         (udev->actconfig->desc.bmAttributes
1035                                          & USB_CONFIG_ATT_WAKEUP));
1036                         else if (new_state != USB_STATE_SUSPENDED)
1037                                 device_init_wakeup(&udev->dev, 0);
1038                 }
1039         } else
1040                 recursively_mark_NOTATTACHED(udev);
1041         spin_unlock_irqrestore(&device_state_lock, flags);
1042 }
1043
1044
1045 #ifdef CONFIG_PM
1046
1047 /**
1048  * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1049  * @rhdev: struct usb_device for the root hub
1050  *
1051  * The USB host controller driver calls this function when its root hub
1052  * is resumed and Vbus power has been interrupted or the controller
1053  * has been reset.  The routine marks all the children of the root hub
1054  * as NOTATTACHED and marks logical connect-change events on their ports.
1055  */
1056 void usb_root_hub_lost_power(struct usb_device *rhdev)
1057 {
1058         struct usb_hub *hub;
1059         int port1;
1060         unsigned long flags;
1061
1062         dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1063         spin_lock_irqsave(&device_state_lock, flags);
1064         hub = hdev_to_hub(rhdev);
1065         for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1066                 if (rhdev->children[port1 - 1]) {
1067                         recursively_mark_NOTATTACHED(
1068                                         rhdev->children[port1 - 1]);
1069                         set_bit(port1, hub->change_bits);
1070                 }
1071         }
1072         spin_unlock_irqrestore(&device_state_lock, flags);
1073 }
1074 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1075
1076 #endif
1077
1078 static void choose_address(struct usb_device *udev)
1079 {
1080         int             devnum;
1081         struct usb_bus  *bus = udev->bus;
1082
1083         /* If khubd ever becomes multithreaded, this will need a lock */
1084
1085         /* Try to allocate the next devnum beginning at bus->devnum_next. */
1086         devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1087                         bus->devnum_next);
1088         if (devnum >= 128)
1089                 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1090
1091         bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1092
1093         if (devnum < 128) {
1094                 set_bit(devnum, bus->devmap.devicemap);
1095                 udev->devnum = devnum;
1096         }
1097 }
1098
1099 static void release_address(struct usb_device *udev)
1100 {
1101         if (udev->devnum > 0) {
1102                 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1103                 udev->devnum = -1;
1104         }
1105 }
1106
1107 /**
1108  * usb_disconnect - disconnect a device (usbcore-internal)
1109  * @pdev: pointer to device being disconnected
1110  * Context: !in_interrupt ()
1111  *
1112  * Something got disconnected. Get rid of it and all of its children.
1113  *
1114  * If *pdev is a normal device then the parent hub must already be locked.
1115  * If *pdev is a root hub then this routine will acquire the
1116  * usb_bus_list_lock on behalf of the caller.
1117  *
1118  * Only hub drivers (including virtual root hub drivers for host
1119  * controllers) should ever call this.
1120  *
1121  * This call is synchronous, and may not be used in an interrupt context.
1122  */
1123 void usb_disconnect(struct usb_device **pdev)
1124 {
1125         struct usb_device       *udev = *pdev;
1126         int                     i;
1127
1128         if (!udev) {
1129                 pr_debug ("%s nodev\n", __FUNCTION__);
1130                 return;
1131         }
1132
1133         /* mark the device as inactive, so any further urb submissions for
1134          * this device (and any of its children) will fail immediately.
1135          * this quiesces everyting except pending urbs.
1136          */
1137         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1138         dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1139
1140         usb_lock_device(udev);
1141
1142         /* Free up all the children before we remove this device */
1143         for (i = 0; i < USB_MAXCHILDREN; i++) {
1144                 if (udev->children[i])
1145                         usb_disconnect(&udev->children[i]);
1146         }
1147
1148         /* deallocate hcd/hardware state ... nuking all pending urbs and
1149          * cleaning up all state associated with the current configuration
1150          * so that the hardware is now fully quiesced.
1151          */
1152         usb_disable_device(udev, 0);
1153
1154         usb_notify_remove_device(udev);
1155
1156         /* Free the device number, remove the /proc/bus/usb entry and
1157          * the sysfs attributes, and delete the parent's children[]
1158          * (or root_hub) pointer.
1159          */
1160         dev_dbg (&udev->dev, "unregistering device\n");
1161         release_address(udev);
1162         usb_remove_sysfs_dev_files(udev);
1163
1164         /* Avoid races with recursively_mark_NOTATTACHED() */
1165         spin_lock_irq(&device_state_lock);
1166         *pdev = NULL;
1167         spin_unlock_irq(&device_state_lock);
1168
1169         usb_unlock_device(udev);
1170
1171         device_unregister(&udev->dev);
1172 }
1173
1174 static inline const char *plural(int n)
1175 {
1176         return (n == 1 ? "" : "s");
1177 }
1178
1179 static int choose_configuration(struct usb_device *udev)
1180 {
1181         int i;
1182         int num_configs;
1183         int insufficient_power = 0;
1184         struct usb_host_config *c, *best;
1185
1186         best = NULL;
1187         c = udev->config;
1188         num_configs = udev->descriptor.bNumConfigurations;
1189         for (i = 0; i < num_configs; (i++, c++)) {
1190                 struct usb_interface_descriptor *desc = NULL;
1191
1192                 /* It's possible that a config has no interfaces! */
1193                 if (c->desc.bNumInterfaces > 0)
1194                         desc = &c->intf_cache[0]->altsetting->desc;
1195
1196                 /*
1197                  * HP's USB bus-powered keyboard has only one configuration
1198                  * and it claims to be self-powered; other devices may have
1199                  * similar errors in their descriptors.  If the next test
1200                  * were allowed to execute, such configurations would always
1201                  * be rejected and the devices would not work as expected.
1202                  * In the meantime, we run the risk of selecting a config
1203                  * that requires external power at a time when that power
1204                  * isn't available.  It seems to be the lesser of two evils.
1205                  *
1206                  * Bugzilla #6448 reports a device that appears to crash
1207                  * when it receives a GET_DEVICE_STATUS request!  We don't
1208                  * have any other way to tell whether a device is self-powered,
1209                  * but since we don't use that information anywhere but here,
1210                  * the call has been removed.
1211                  *
1212                  * Maybe the GET_DEVICE_STATUS call and the test below can
1213                  * be reinstated when device firmwares become more reliable.
1214                  * Don't hold your breath.
1215                  */
1216 #if 0
1217                 /* Rule out self-powered configs for a bus-powered device */
1218                 if (bus_powered && (c->desc.bmAttributes &
1219                                         USB_CONFIG_ATT_SELFPOWER))
1220                         continue;
1221 #endif
1222
1223                 /*
1224                  * The next test may not be as effective as it should be.
1225                  * Some hubs have errors in their descriptor, claiming
1226                  * to be self-powered when they are really bus-powered.
1227                  * We will overestimate the amount of current such hubs
1228                  * make available for each port.
1229                  *
1230                  * This is a fairly benign sort of failure.  It won't
1231                  * cause us to reject configurations that we should have
1232                  * accepted.
1233                  */
1234
1235                 /* Rule out configs that draw too much bus current */
1236                 if (c->desc.bMaxPower * 2 > udev->bus_mA) {
1237                         insufficient_power++;
1238                         continue;
1239                 }
1240
1241                 /* If the first config's first interface is COMM/2/0xff
1242                  * (MSFT RNDIS), rule it out unless Linux has host-side
1243                  * RNDIS support. */
1244                 if (i == 0 && desc
1245                                 && desc->bInterfaceClass == USB_CLASS_COMM
1246                                 && desc->bInterfaceSubClass == 2
1247                                 && desc->bInterfaceProtocol == 0xff) {
1248 #ifndef CONFIG_USB_NET_RNDIS_HOST
1249                         continue;
1250 #else
1251                         best = c;
1252 #endif
1253                 }
1254
1255                 /* From the remaining configs, choose the first one whose
1256                  * first interface is for a non-vendor-specific class.
1257                  * Reason: Linux is more likely to have a class driver
1258                  * than a vendor-specific driver. */
1259                 else if (udev->descriptor.bDeviceClass !=
1260                                                 USB_CLASS_VENDOR_SPEC &&
1261                                 (!desc || desc->bInterfaceClass !=
1262                                                 USB_CLASS_VENDOR_SPEC)) {
1263                         best = c;
1264                         break;
1265                 }
1266
1267                 /* If all the remaining configs are vendor-specific,
1268                  * choose the first one. */
1269                 else if (!best)
1270                         best = c;
1271         }
1272
1273         if (insufficient_power > 0)
1274                 dev_info(&udev->dev, "rejected %d configuration%s "
1275                         "due to insufficient available bus power\n",
1276                         insufficient_power, plural(insufficient_power));
1277
1278         if (best) {
1279                 i = best->desc.bConfigurationValue;
1280                 dev_info(&udev->dev,
1281                         "configuration #%d chosen from %d choice%s\n",
1282                         i, num_configs, plural(num_configs));
1283         } else {
1284                 i = -1;
1285                 dev_warn(&udev->dev,
1286                         "no configuration chosen from %d choice%s\n",
1287                         num_configs, plural(num_configs));
1288         }
1289         return i;
1290 }
1291
1292 #ifdef DEBUG
1293 static void show_string(struct usb_device *udev, char *id, char *string)
1294 {
1295         if (!string)
1296                 return;
1297         dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1298 }
1299
1300 #else
1301 static inline void show_string(struct usb_device *udev, char *id, char *string)
1302 {}
1303 #endif
1304
1305
1306 #ifdef  CONFIG_USB_OTG
1307 #include "otg_whitelist.h"
1308 #endif
1309
1310 /**
1311  * usb_new_device - perform initial device setup (usbcore-internal)
1312  * @udev: newly addressed device (in ADDRESS state)
1313  *
1314  * This is called with devices which have been enumerated, but not yet
1315  * configured.  The device descriptor is available, but not descriptors
1316  * for any device configuration.  The caller must have locked either
1317  * the parent hub (if udev is a normal device) or else the
1318  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1319  * udev has already been installed, but udev is not yet visible through
1320  * sysfs or other filesystem code.
1321  *
1322  * Returns 0 for success (device is configured and listed, with its
1323  * interfaces, in sysfs); else a negative errno value.
1324  *
1325  * This call is synchronous, and may not be used in an interrupt context.
1326  *
1327  * Only the hub driver or root-hub registrar should ever call this.
1328  */
1329 int usb_new_device(struct usb_device *udev)
1330 {
1331         int err;
1332         int c;
1333
1334         err = usb_get_configuration(udev);
1335         if (err < 0) {
1336                 dev_err(&udev->dev, "can't read configurations, error %d\n",
1337                         err);
1338                 goto fail;
1339         }
1340
1341         /* read the standard strings and cache them if present */
1342         udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1343         udev->manufacturer = usb_cache_string(udev,
1344                         udev->descriptor.iManufacturer);
1345         udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1346
1347         /* Tell the world! */
1348         dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1349                         "SerialNumber=%d\n",
1350                         udev->descriptor.iManufacturer,
1351                         udev->descriptor.iProduct,
1352                         udev->descriptor.iSerialNumber);
1353         show_string(udev, "Product", udev->product);
1354         show_string(udev, "Manufacturer", udev->manufacturer);
1355         show_string(udev, "SerialNumber", udev->serial);
1356
1357 #ifdef  CONFIG_USB_OTG
1358         /*
1359          * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1360          * to wake us after we've powered off VBUS; and HNP, switching roles
1361          * "host" to "peripheral".  The OTG descriptor helps figure this out.
1362          */
1363         if (!udev->bus->is_b_host
1364                         && udev->config
1365                         && udev->parent == udev->bus->root_hub) {
1366                 struct usb_otg_descriptor       *desc = 0;
1367                 struct usb_bus                  *bus = udev->bus;
1368
1369                 /* descriptor may appear anywhere in config */
1370                 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1371                                         le16_to_cpu(udev->config[0].desc.wTotalLength),
1372                                         USB_DT_OTG, (void **) &desc) == 0) {
1373                         if (desc->bmAttributes & USB_OTG_HNP) {
1374                                 unsigned                port1 = udev->portnum;
1375                                 struct usb_device       *root = udev->parent;
1376
1377                                 dev_info(&udev->dev,
1378                                         "Dual-Role OTG device on %sHNP port\n",
1379                                         (port1 == bus->otg_port)
1380                                                 ? "" : "non-");
1381
1382                                 /* enable HNP before suspend, it's simpler */
1383                                 if (port1 == bus->otg_port)
1384                                         bus->b_hnp_enable = 1;
1385                                 err = usb_control_msg(udev,
1386                                         usb_sndctrlpipe(udev, 0),
1387                                         USB_REQ_SET_FEATURE, 0,
1388                                         bus->b_hnp_enable
1389                                                 ? USB_DEVICE_B_HNP_ENABLE
1390                                                 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1391                                         0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1392                                 if (err < 0) {
1393                                         /* OTG MESSAGE: report errors here,
1394                                          * customize to match your product.
1395                                          */
1396                                         dev_info(&udev->dev,
1397                                                 "can't set HNP mode; %d\n",
1398                                                 err);
1399                                         bus->b_hnp_enable = 0;
1400                                 }
1401                         }
1402                 }
1403         }
1404
1405         if (!is_targeted(udev)) {
1406
1407                 /* Maybe it can talk to us, though we can't talk to it.
1408                  * (Includes HNP test device.)
1409                  */
1410                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1411                         static int __usb_suspend_device(struct usb_device *,
1412                                                 int port1);
1413                         err = __usb_suspend_device(udev, udev->bus->otg_port);
1414                         if (err < 0)
1415                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1416                 }
1417                 err = -ENODEV;
1418                 goto fail;
1419         }
1420 #endif
1421
1422         /* put device-specific files into sysfs */
1423         err = device_add (&udev->dev);
1424         if (err) {
1425                 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1426                 goto fail;
1427         }
1428         usb_create_sysfs_dev_files (udev);
1429
1430         usb_lock_device(udev);
1431
1432         /* choose and set the configuration. that registers the interfaces
1433          * with the driver core, and lets usb device drivers bind to them.
1434          */
1435         c = choose_configuration(udev);
1436         if (c >= 0) {
1437                 err = usb_set_configuration(udev, c);
1438                 if (err) {
1439                         dev_err(&udev->dev, "can't set config #%d, error %d\n",
1440                                         c, err);
1441                         /* This need not be fatal.  The user can try to
1442                          * set other configurations. */
1443                 }
1444         }
1445
1446         /* USB device state == configured ... usable */
1447         usb_notify_add_device(udev);
1448
1449         usb_unlock_device(udev);
1450
1451         return 0;
1452
1453 fail:
1454         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1455         return err;
1456 }
1457
1458
1459 static int hub_port_status(struct usb_hub *hub, int port1,
1460                                u16 *status, u16 *change)
1461 {
1462         int ret;
1463
1464         ret = get_port_status(hub->hdev, port1, &hub->status->port);
1465         if (ret < 0)
1466                 dev_err (hub->intfdev,
1467                         "%s failed (err = %d)\n", __FUNCTION__, ret);
1468         else {
1469                 *status = le16_to_cpu(hub->status->port.wPortStatus);
1470                 *change = le16_to_cpu(hub->status->port.wPortChange);
1471                 ret = 0;
1472         }
1473         return ret;
1474 }
1475
1476 #define PORT_RESET_TRIES        5
1477 #define SET_ADDRESS_TRIES       2
1478 #define GET_DESCRIPTOR_TRIES    2
1479 #define SET_CONFIG_TRIES        (2 * (use_both_schemes + 1))
1480 #define USE_NEW_SCHEME(i)       ((i) / 2 == old_scheme_first)
1481
1482 #define HUB_ROOT_RESET_TIME     50      /* times are in msec */
1483 #define HUB_SHORT_RESET_TIME    10
1484 #define HUB_LONG_RESET_TIME     200
1485 #define HUB_RESET_TIMEOUT       500
1486
1487 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1488                                 struct usb_device *udev, unsigned int delay)
1489 {
1490         int delay_time, ret;
1491         u16 portstatus;
1492         u16 portchange;
1493
1494         for (delay_time = 0;
1495                         delay_time < HUB_RESET_TIMEOUT;
1496                         delay_time += delay) {
1497                 /* wait to give the device a chance to reset */
1498                 msleep(delay);
1499
1500                 /* read and decode port status */
1501                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1502                 if (ret < 0)
1503                         return ret;
1504
1505                 /* Device went away? */
1506                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1507                         return -ENOTCONN;
1508
1509                 /* bomb out completely if something weird happened */
1510                 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1511                         return -EINVAL;
1512
1513                 /* if we`ve finished resetting, then break out of the loop */
1514                 if (!(portstatus & USB_PORT_STAT_RESET) &&
1515                     (portstatus & USB_PORT_STAT_ENABLE)) {
1516                         if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1517                                 udev->speed = USB_SPEED_HIGH;
1518                         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1519                                 udev->speed = USB_SPEED_LOW;
1520                         else
1521                                 udev->speed = USB_SPEED_FULL;
1522                         return 0;
1523                 }
1524
1525                 /* switch to the long delay after two short delay failures */
1526                 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1527                         delay = HUB_LONG_RESET_TIME;
1528
1529                 dev_dbg (hub->intfdev,
1530                         "port %d not reset yet, waiting %dms\n",
1531                         port1, delay);
1532         }
1533
1534         return -EBUSY;
1535 }
1536
1537 static int hub_port_reset(struct usb_hub *hub, int port1,
1538                                 struct usb_device *udev, unsigned int delay)
1539 {
1540         int i, status;
1541
1542         /* Reset the port */
1543         for (i = 0; i < PORT_RESET_TRIES; i++) {
1544                 status = set_port_feature(hub->hdev,
1545                                 port1, USB_PORT_FEAT_RESET);
1546                 if (status)
1547                         dev_err(hub->intfdev,
1548                                         "cannot reset port %d (err = %d)\n",
1549                                         port1, status);
1550                 else {
1551                         status = hub_port_wait_reset(hub, port1, udev, delay);
1552                         if (status && status != -ENOTCONN)
1553                                 dev_dbg(hub->intfdev,
1554                                                 "port_wait_reset: err = %d\n",
1555                                                 status);
1556                 }
1557
1558                 /* return on disconnect or reset */
1559                 switch (status) {
1560                 case 0:
1561                         /* TRSTRCY = 10 ms; plus some extra */
1562                         msleep(10 + 40);
1563                         /* FALL THROUGH */
1564                 case -ENOTCONN:
1565                 case -ENODEV:
1566                         clear_port_feature(hub->hdev,
1567                                 port1, USB_PORT_FEAT_C_RESET);
1568                         /* FIXME need disconnect() for NOTATTACHED device */
1569                         usb_set_device_state(udev, status
1570                                         ? USB_STATE_NOTATTACHED
1571                                         : USB_STATE_DEFAULT);
1572                         return status;
1573                 }
1574
1575                 dev_dbg (hub->intfdev,
1576                         "port %d not enabled, trying reset again...\n",
1577                         port1);
1578                 delay = HUB_LONG_RESET_TIME;
1579         }
1580
1581         dev_err (hub->intfdev,
1582                 "Cannot enable port %i.  Maybe the USB cable is bad?\n",
1583                 port1);
1584
1585         return status;
1586 }
1587
1588 /*
1589  * Disable a port and mark a logical connnect-change event, so that some
1590  * time later khubd will disconnect() any existing usb_device on the port
1591  * and will re-enumerate if there actually is a device attached.
1592  */
1593 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1594 {
1595         dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1596         hub_port_disable(hub, port1, 1);
1597
1598         /* FIXME let caller ask to power down the port:
1599          *  - some devices won't enumerate without a VBUS power cycle
1600          *  - SRP saves power that way
1601          *  - ... new call, TBD ...
1602          * That's easy if this hub can switch power per-port, and
1603          * khubd reactivates the port later (timer, SRP, etc).
1604          * Powerdown must be optional, because of reset/DFU.
1605          */
1606
1607         set_bit(port1, hub->change_bits);
1608         kick_khubd(hub);
1609 }
1610
1611
1612 #ifdef  CONFIG_USB_SUSPEND
1613
1614 /*
1615  * Selective port suspend reduces power; most suspended devices draw
1616  * less than 500 uA.  It's also used in OTG, along with remote wakeup.
1617  * All devices below the suspended port are also suspended.
1618  *
1619  * Devices leave suspend state when the host wakes them up.  Some devices
1620  * also support "remote wakeup", where the device can activate the USB
1621  * tree above them to deliver data, such as a keypress or packet.  In
1622  * some cases, this wakes the USB host.
1623  */
1624 static int hub_port_suspend(struct usb_hub *hub, int port1,
1625                 struct usb_device *udev)
1626 {
1627         int     status;
1628
1629         // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1630
1631         /* enable remote wakeup when appropriate; this lets the device
1632          * wake up the upstream hub (including maybe the root hub).
1633          *
1634          * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
1635          * we don't explicitly enable it here.
1636          */
1637         if (device_may_wakeup(&udev->dev)) {
1638                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1639                                 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1640                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1641                                 NULL, 0,
1642                                 USB_CTRL_SET_TIMEOUT);
1643                 if (status)
1644                         dev_dbg(&udev->dev,
1645                                 "won't remote wakeup, status %d\n",
1646                                 status);
1647         }
1648
1649         /* see 7.1.7.6 */
1650         status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1651         if (status) {
1652                 dev_dbg(hub->intfdev,
1653                         "can't suspend port %d, status %d\n",
1654                         port1, status);
1655                 /* paranoia:  "should not happen" */
1656                 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1657                                 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1658                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1659                                 NULL, 0,
1660                                 USB_CTRL_SET_TIMEOUT);
1661         } else {
1662                 /* device has up to 10 msec to fully suspend */
1663                 dev_dbg(&udev->dev, "usb suspend\n");
1664                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1665                 msleep(10);
1666         }
1667         return status;
1668 }
1669
1670 /*
1671  * Devices on USB hub ports have only one "suspend" state, corresponding
1672  * to ACPI D2, "may cause the device to lose some context".
1673  * State transitions include:
1674  *
1675  *   - suspend, resume ... when the VBUS power link stays live
1676  *   - suspend, disconnect ... VBUS lost
1677  *
1678  * Once VBUS drop breaks the circuit, the port it's using has to go through
1679  * normal re-enumeration procedures, starting with enabling VBUS power.
1680  * Other than re-initializing the hub (plug/unplug, except for root hubs),
1681  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
1682  * timer, no SRP, no requests through sysfs.
1683  *
1684  * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1685  * the root hub for their bus goes into global suspend ... so we don't
1686  * (falsely) update the device power state to say it suspended.
1687  */
1688 static int __usb_suspend_device (struct usb_device *udev, int port1)
1689 {
1690         int     status = 0;
1691
1692         /* caller owns the udev device lock */
1693         if (port1 < 0)
1694                 return port1;
1695
1696         if (udev->state == USB_STATE_SUSPENDED
1697                         || udev->state == USB_STATE_NOTATTACHED) {
1698                 return 0;
1699         }
1700
1701         /* all interfaces must already be suspended */
1702         if (udev->actconfig) {
1703                 int     i;
1704
1705                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1706                         struct usb_interface    *intf;
1707
1708                         intf = udev->actconfig->interface[i];
1709                         if (is_active(intf)) {
1710                                 dev_dbg(&intf->dev, "nyet suspended\n");
1711                                 return -EBUSY;
1712                         }
1713                 }
1714         }
1715
1716         /* we only change a device's upstream USB link.
1717          * root hubs have no upstream USB link.
1718          */
1719         if (udev->parent)
1720                 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1721                                 udev);
1722
1723         if (status == 0)
1724                 udev->dev.power.power_state = PMSG_SUSPEND;
1725         return status;
1726 }
1727
1728 #endif
1729
1730 /*
1731  * usb_suspend_device - suspend a usb device
1732  * @udev: device that's no longer in active use
1733  * Context: must be able to sleep; device not locked; pm locks held
1734  *
1735  * Suspends a USB device that isn't in active use, conserving power.
1736  * Devices may wake out of a suspend, if anything important happens,
1737  * using the remote wakeup mechanism.  They may also be taken out of
1738  * suspend by the host, using usb_resume_device().  It's also routine
1739  * to disconnect devices while they are suspended.
1740  *
1741  * This only affects the USB hardware for a device; its interfaces
1742  * (and, for hubs, child devices) must already have been suspended.
1743  *
1744  * Suspending OTG devices may trigger HNP, if that's been enabled
1745  * between a pair of dual-role devices.  That will change roles, such
1746  * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1747  *
1748  * Returns 0 on success, else negative errno.
1749  */
1750 int usb_suspend_device(struct usb_device *udev)
1751 {
1752 #ifdef  CONFIG_USB_SUSPEND
1753         if (udev->state == USB_STATE_NOTATTACHED)
1754                 return -ENODEV;
1755         return __usb_suspend_device(udev, udev->portnum);
1756 #else
1757         /* NOTE:  udev->state unchanged, it's not lying ... */
1758         udev->dev.power.power_state = PMSG_SUSPEND;
1759         return 0;
1760 #endif
1761 }
1762
1763 /*
1764  * If the USB "suspend" state is in use (rather than "global suspend"),
1765  * many devices will be individually taken out of suspend state using
1766  * special" resume" signaling.  These routines kick in shortly after
1767  * hardware resume signaling is finished, either because of selective
1768  * resume (by host) or remote wakeup (by device) ... now see what changed
1769  * in the tree that's rooted at this device.
1770  */
1771 static int finish_device_resume(struct usb_device *udev)
1772 {
1773         int     status;
1774         u16     devstatus;
1775
1776         /* caller owns the udev device lock */
1777         dev_dbg(&udev->dev, "finish resume\n");
1778
1779         /* usb ch9 identifies four variants of SUSPENDED, based on what
1780          * state the device resumes to.  Linux currently won't see the
1781          * first two on the host side; they'd be inside hub_port_init()
1782          * during many timeouts, but khubd can't suspend until later.
1783          */
1784         usb_set_device_state(udev, udev->actconfig
1785                         ? USB_STATE_CONFIGURED
1786                         : USB_STATE_ADDRESS);
1787         udev->dev.power.power_state = PMSG_ON;
1788
1789         /* 10.5.4.5 says be sure devices in the tree are still there.
1790          * For now let's assume the device didn't go crazy on resume,
1791          * and device drivers will know about any resume quirks.
1792          */
1793         status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1794         if (status < 2)
1795                 dev_dbg(&udev->dev,
1796                         "gone after usb resume? status %d\n",
1797                         status);
1798         else if (udev->actconfig) {
1799                 unsigned        i;
1800                 int             (*resume)(struct device *);
1801
1802                 le16_to_cpus(&devstatus);
1803                 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1804                                 && udev->parent) {
1805                         status = usb_control_msg(udev,
1806                                         usb_sndctrlpipe(udev, 0),
1807                                         USB_REQ_CLEAR_FEATURE,
1808                                                 USB_RECIP_DEVICE,
1809                                         USB_DEVICE_REMOTE_WAKEUP, 0,
1810                                         NULL, 0,
1811                                         USB_CTRL_SET_TIMEOUT);
1812                         if (status) {
1813                                 dev_dbg(&udev->dev, "disable remote "
1814                                         "wakeup, status %d\n", status);
1815                                 status = 0;
1816                         }
1817                 }
1818
1819                 /* resume interface drivers; if this is a hub, it
1820                  * may have a child resume event to deal with soon
1821                  */
1822                 resume = udev->dev.bus->resume;
1823                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1824                         struct device *dev =
1825                                         &udev->actconfig->interface[i]->dev;
1826
1827                         down(&dev->sem);
1828                         (void) resume(dev);
1829                         up(&dev->sem);
1830                 }
1831                 status = 0;
1832
1833         } else if (udev->devnum <= 0) {
1834                 dev_dbg(&udev->dev, "bogus resume!\n");
1835                 status = -EINVAL;
1836         }
1837         return status;
1838 }
1839
1840 #ifdef  CONFIG_USB_SUSPEND
1841
1842 static int
1843 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1844 {
1845         int     status;
1846
1847         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1848
1849         /* see 7.1.7.7; affects power usage, but not budgeting */
1850         status = clear_port_feature(hub->hdev,
1851                         port1, USB_PORT_FEAT_SUSPEND);
1852         if (status) {
1853                 dev_dbg(hub->intfdev,
1854                         "can't resume port %d, status %d\n",
1855                         port1, status);
1856         } else {
1857                 u16             devstatus;
1858                 u16             portchange;
1859
1860                 /* drive resume for at least 20 msec */
1861                 if (udev)
1862                         dev_dbg(&udev->dev, "RESUME\n");
1863                 msleep(25);
1864
1865 #define LIVE_FLAGS      ( USB_PORT_STAT_POWER \
1866                         | USB_PORT_STAT_ENABLE \
1867                         | USB_PORT_STAT_CONNECTION)
1868
1869                 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1870                  * stop resume signaling.  Then finish the resume
1871                  * sequence.
1872                  */
1873                 devstatus = portchange = 0;
1874                 status = hub_port_status(hub, port1,
1875                                 &devstatus, &portchange);
1876                 if (status < 0
1877                                 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1878                                 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1879                                 ) {
1880                         dev_dbg(hub->intfdev,
1881                                 "port %d status %04x.%04x after resume, %d\n",
1882                                 port1, portchange, devstatus, status);
1883                 } else {
1884                         /* TRSMRCY = 10 msec */
1885                         msleep(10);
1886                         if (udev)
1887                                 status = finish_device_resume(udev);
1888                 }
1889         }
1890         if (status < 0)
1891                 hub_port_logical_disconnect(hub, port1);
1892
1893         return status;
1894 }
1895
1896 #endif
1897
1898 /*
1899  * usb_resume_device - re-activate a suspended usb device
1900  * @udev: device to re-activate
1901  * Context: must be able to sleep; device not locked; pm locks held
1902  *
1903  * This will re-activate the suspended device, increasing power usage
1904  * while letting drivers communicate again with its endpoints.
1905  * USB resume explicitly guarantees that the power session between
1906  * the host and the device is the same as it was when the device
1907  * suspended.
1908  *
1909  * Returns 0 on success, else negative errno.
1910  */
1911 int usb_resume_device(struct usb_device *udev)
1912 {
1913         int     status;
1914
1915         if (udev->state == USB_STATE_NOTATTACHED)
1916                 return -ENODEV;
1917
1918         /* selective resume of one downstream hub-to-device port */
1919         if (udev->parent) {
1920 #ifdef  CONFIG_USB_SUSPEND
1921                 if (udev->state == USB_STATE_SUSPENDED) {
1922                         // NOTE swsusp may bork us, device state being wrong...
1923                         // NOTE this fails if parent is also suspended...
1924                         status = hub_port_resume(hdev_to_hub(udev->parent),
1925                                         udev->portnum, udev);
1926                 } else
1927 #endif
1928                         status = 0;
1929         } else
1930                 status = finish_device_resume(udev);
1931         if (status < 0)
1932                 dev_dbg(&udev->dev, "can't resume, status %d\n",
1933                         status);
1934
1935         /* rebind drivers that had no suspend() */
1936         if (status == 0) {
1937                 usb_unlock_device(udev);
1938                 bus_rescan_devices(&usb_bus_type);
1939                 usb_lock_device(udev);
1940         }
1941         return status;
1942 }
1943
1944 static int remote_wakeup(struct usb_device *udev)
1945 {
1946         int     status = 0;
1947
1948 #ifdef  CONFIG_USB_SUSPEND
1949
1950         /* don't repeat RESUME sequence if this device
1951          * was already woken up by some other task
1952          */
1953         usb_lock_device(udev);
1954         if (udev->state == USB_STATE_SUSPENDED) {
1955                 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1956                 /* TRSMRCY = 10 msec */
1957                 msleep(10);
1958                 status = finish_device_resume(udev);
1959         }
1960         usb_unlock_device(udev);
1961 #endif
1962         return status;
1963 }
1964
1965 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1966 {
1967         struct usb_hub          *hub = usb_get_intfdata (intf);
1968         struct usb_device       *hdev = hub->hdev;
1969         unsigned                port1;
1970
1971         /* fail if children aren't already suspended */
1972         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1973                 struct usb_device       *udev;
1974
1975                 udev = hdev->children [port1-1];
1976                 if (udev && (udev->dev.power.power_state.event
1977                                         == PM_EVENT_ON
1978 #ifdef  CONFIG_USB_SUSPEND
1979                                 || udev->state != USB_STATE_SUSPENDED
1980 #endif
1981                                 )) {
1982                         dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1983                         return -EBUSY;
1984                 }
1985         }
1986
1987         /* "global suspend" of the downstream HC-to-USB interface */
1988         if (!hdev->parent) {
1989                 struct usb_bus  *bus = hdev->bus;
1990                 if (bus) {
1991                         int     status = hcd_bus_suspend (bus);
1992
1993                         if (status != 0) {
1994                                 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1995                                         status);
1996                                 return status;
1997                         }
1998                 } else
1999                         return -EOPNOTSUPP;
2000         }
2001
2002         /* stop khubd and related activity */
2003         hub_quiesce(hub);
2004         return 0;
2005 }
2006
2007 static int hub_resume(struct usb_interface *intf)
2008 {
2009         struct usb_device       *hdev = interface_to_usbdev(intf);
2010         struct usb_hub          *hub = usb_get_intfdata (intf);
2011         int                     status;
2012
2013         /* "global resume" of the downstream HC-to-USB interface */
2014         if (!hdev->parent) {
2015                 struct usb_bus  *bus = hdev->bus;
2016                 if (bus) {
2017                         status = hcd_bus_resume (bus);
2018                         if (status) {
2019                                 dev_dbg(&intf->dev, "'global' resume %d\n",
2020                                         status);
2021                                 return status;
2022                         }
2023                 } else
2024                         return -EOPNOTSUPP;
2025                 if (status == 0) {
2026                         /* TRSMRCY = 10 msec */
2027                         msleep(10);
2028                 }
2029         }
2030
2031         hub_activate(hub);
2032
2033         /* REVISIT:  this recursion probably shouldn't exist.  Remove
2034          * this code sometime, after retesting with different root and
2035          * external hubs.
2036          */
2037 #ifdef  CONFIG_USB_SUSPEND
2038         {
2039         unsigned                port1;
2040
2041         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2042                 struct usb_device       *udev;
2043                 u16                     portstat, portchange;
2044
2045                 udev = hdev->children [port1-1];
2046                 status = hub_port_status(hub, port1, &portstat, &portchange);
2047                 if (status == 0) {
2048                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2049                                 clear_port_feature(hdev, port1,
2050                                         USB_PORT_FEAT_C_SUSPEND);
2051                                 portchange &= ~USB_PORT_STAT_C_SUSPEND;
2052                         }
2053
2054                         /* let khubd handle disconnects etc */
2055                         if (portchange)
2056                                 continue;
2057                 }
2058
2059                 if (!udev || status < 0)
2060                         continue;
2061                 usb_lock_device(udev);
2062                 if (portstat & USB_PORT_STAT_SUSPEND)
2063                         status = hub_port_resume(hub, port1, udev);
2064                 else {
2065                         status = finish_device_resume(udev);
2066                         if (status < 0) {
2067                                 dev_dbg(&intf->dev, "resume port %d --> %d\n",
2068                                         port1, status);
2069                                 hub_port_logical_disconnect(hub, port1);
2070                         }
2071                 }
2072                 usb_unlock_device(udev);
2073         }
2074         }
2075 #endif
2076         return 0;
2077 }
2078
2079 void usb_suspend_root_hub(struct usb_device *hdev)
2080 {
2081         struct usb_hub *hub = hdev_to_hub(hdev);
2082
2083         /* This also makes any led blinker stop retriggering.  We're called
2084          * from irq, so the blinker might still be scheduled.  Caller promises
2085          * that the root hub status URB will be canceled.
2086          */
2087         __hub_quiesce(hub);
2088         mark_quiesced(to_usb_interface(hub->intfdev));
2089 }
2090
2091 void usb_resume_root_hub(struct usb_device *hdev)
2092 {
2093         struct usb_hub *hub = hdev_to_hub(hdev);
2094
2095         hub->resume_root_hub = 1;
2096         kick_khubd(hub);
2097 }
2098
2099
2100 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2101  *
2102  * Between connect detection and reset signaling there must be a delay
2103  * of 100ms at least for debounce and power-settling.  The corresponding
2104  * timer shall restart whenever the downstream port detects a disconnect.
2105  *
2106  * Apparently there are some bluetooth and irda-dongles and a number of
2107  * low-speed devices for which this debounce period may last over a second.
2108  * Not covered by the spec - but easy to deal with.
2109  *
2110  * This implementation uses a 1500ms total debounce timeout; if the
2111  * connection isn't stable by then it returns -ETIMEDOUT.  It checks
2112  * every 25ms for transient disconnects.  When the port status has been
2113  * unchanged for 100ms it returns the port status.
2114  */
2115
2116 #define HUB_DEBOUNCE_TIMEOUT    1500
2117 #define HUB_DEBOUNCE_STEP         25
2118 #define HUB_DEBOUNCE_STABLE      100
2119
2120 static int hub_port_debounce(struct usb_hub *hub, int port1)
2121 {
2122         int ret;
2123         int total_time, stable_time = 0;
2124         u16 portchange, portstatus;
2125         unsigned connection = 0xffff;
2126
2127         for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2128                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2129                 if (ret < 0)
2130                         return ret;
2131
2132                 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2133                      (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2134                         stable_time += HUB_DEBOUNCE_STEP;
2135                         if (stable_time >= HUB_DEBOUNCE_STABLE)
2136                                 break;
2137                 } else {
2138                         stable_time = 0;
2139                         connection = portstatus & USB_PORT_STAT_CONNECTION;
2140                 }
2141
2142                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2143                         clear_port_feature(hub->hdev, port1,
2144                                         USB_PORT_FEAT_C_CONNECTION);
2145                 }
2146
2147                 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2148                         break;
2149                 msleep(HUB_DEBOUNCE_STEP);
2150         }
2151
2152         dev_dbg (hub->intfdev,
2153                 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2154                 port1, total_time, stable_time, portstatus);
2155
2156         if (stable_time < HUB_DEBOUNCE_STABLE)
2157                 return -ETIMEDOUT;
2158         return portstatus;
2159 }
2160
2161 static void ep0_reinit(struct usb_device *udev)
2162 {
2163         usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2164         usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2165         udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2166 }
2167
2168 #define usb_sndaddr0pipe()      (PIPE_CONTROL << 30)
2169 #define usb_rcvaddr0pipe()      ((PIPE_CONTROL << 30) | USB_DIR_IN)
2170
2171 static int hub_set_address(struct usb_device *udev)
2172 {
2173         int retval;
2174
2175         if (udev->devnum == 0)
2176                 return -EINVAL;
2177         if (udev->state == USB_STATE_ADDRESS)
2178                 return 0;
2179         if (udev->state != USB_STATE_DEFAULT)
2180                 return -EINVAL;
2181         retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2182                 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2183                 NULL, 0, USB_CTRL_SET_TIMEOUT);
2184         if (retval == 0) {
2185                 usb_set_device_state(udev, USB_STATE_ADDRESS);
2186                 ep0_reinit(udev);
2187         }
2188         return retval;
2189 }
2190
2191 /* Reset device, (re)assign address, get device descriptor.
2192  * Device connection must be stable, no more debouncing needed.
2193  * Returns device in USB_STATE_ADDRESS, except on error.
2194  *
2195  * If this is called for an already-existing device (as part of
2196  * usb_reset_device), the caller must own the device lock.  For a
2197  * newly detected device that is not accessible through any global
2198  * pointers, it's not necessary to lock the device.
2199  */
2200 static int
2201 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2202                 int retry_counter)
2203 {
2204         static DEFINE_MUTEX(usb_address0_mutex);
2205
2206         struct usb_device       *hdev = hub->hdev;
2207         int                     i, j, retval;
2208         unsigned                delay = HUB_SHORT_RESET_TIME;
2209         enum usb_device_speed   oldspeed = udev->speed;
2210
2211         /* root hub ports have a slightly longer reset period
2212          * (from USB 2.0 spec, section 7.1.7.5)
2213          */
2214         if (!hdev->parent) {
2215                 delay = HUB_ROOT_RESET_TIME;
2216                 if (port1 == hdev->bus->otg_port)
2217                         hdev->bus->b_hnp_enable = 0;
2218         }
2219
2220         /* Some low speed devices have problems with the quick delay, so */
2221         /*  be a bit pessimistic with those devices. RHbug #23670 */
2222         if (oldspeed == USB_SPEED_LOW)
2223                 delay = HUB_LONG_RESET_TIME;
2224
2225         mutex_lock(&usb_address0_mutex);
2226
2227         /* Reset the device; full speed may morph to high speed */
2228         retval = hub_port_reset(hub, port1, udev, delay);
2229         if (retval < 0)         /* error or disconnect */
2230                 goto fail;
2231                                 /* success, speed is known */
2232         retval = -ENODEV;
2233
2234         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2235                 dev_dbg(&udev->dev, "device reset changed speed!\n");
2236                 goto fail;
2237         }
2238         oldspeed = udev->speed;
2239
2240         /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2241          * it's fixed size except for full speed devices.
2242          */
2243         switch (udev->speed) {
2244         case USB_SPEED_HIGH:            /* fixed at 64 */
2245                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2246                 break;
2247         case USB_SPEED_FULL:            /* 8, 16, 32, or 64 */
2248                 /* to determine the ep0 maxpacket size, try to read
2249                  * the device descriptor to get bMaxPacketSize0 and
2250                  * then correct our initial guess.
2251                  */
2252                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2253                 break;
2254         case USB_SPEED_LOW:             /* fixed at 8 */
2255                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2256                 break;
2257         default:
2258                 goto fail;
2259         }
2260
2261         dev_info (&udev->dev,
2262                         "%s %s speed USB device using %s and address %d\n",
2263                         (udev->config) ? "reset" : "new",
2264                         ({ char *speed; switch (udev->speed) {
2265                         case USB_SPEED_LOW:     speed = "low";  break;
2266                         case USB_SPEED_FULL:    speed = "full"; break;
2267                         case USB_SPEED_HIGH:    speed = "high"; break;
2268                         default:                speed = "?";    break;
2269                         }; speed;}),
2270                         udev->bus->controller->driver->name,
2271                         udev->devnum);
2272
2273         /* Set up TT records, if needed  */
2274         if (hdev->tt) {
2275                 udev->tt = hdev->tt;
2276                 udev->ttport = hdev->ttport;
2277         } else if (udev->speed != USB_SPEED_HIGH
2278                         && hdev->speed == USB_SPEED_HIGH) {
2279                 udev->tt = &hub->tt;
2280                 udev->ttport = port1;
2281         }
2282
2283         /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2284          * Because device hardware and firmware is sometimes buggy in
2285          * this area, and this is how Linux has done it for ages.
2286          * Change it cautiously.
2287          *
2288          * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2289          * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2290          * so it may help with some non-standards-compliant devices.
2291          * Otherwise we start with SET_ADDRESS and then try to read the
2292          * first 8 bytes of the device descriptor to get the ep0 maxpacket
2293          * value.
2294          */
2295         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2296                 if (USE_NEW_SCHEME(retry_counter)) {
2297                         struct usb_device_descriptor *buf;
2298                         int r = 0;
2299
2300 #define GET_DESCRIPTOR_BUFSIZE  64
2301                         buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2302                         if (!buf) {
2303                                 retval = -ENOMEM;
2304                                 continue;
2305                         }
2306
2307                         /* Use a short timeout the first time through,
2308                          * so that recalcitrant full-speed devices with
2309                          * 8- or 16-byte ep0-maxpackets won't slow things
2310                          * down tremendously by NAKing the unexpectedly
2311                          * early status stage.  Also, retry on all errors;
2312                          * some devices are flakey.
2313                          */
2314                         for (j = 0; j < 3; ++j) {
2315                                 buf->bMaxPacketSize0 = 0;
2316                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2317                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2318                                         USB_DT_DEVICE << 8, 0,
2319                                         buf, GET_DESCRIPTOR_BUFSIZE,
2320                                         (i ? USB_CTRL_GET_TIMEOUT : 1000));
2321                                 switch (buf->bMaxPacketSize0) {
2322                                 case 8: case 16: case 32: case 64:
2323                                         if (buf->bDescriptorType ==
2324                                                         USB_DT_DEVICE) {
2325                                                 r = 0;
2326                                                 break;
2327                                         }
2328                                         /* FALL THROUGH */
2329                                 default:
2330                                         if (r == 0)
2331                                                 r = -EPROTO;
2332                                         break;
2333                                 }
2334                                 if (r == 0)
2335                                         break;
2336                         }
2337                         udev->descriptor.bMaxPacketSize0 =
2338                                         buf->bMaxPacketSize0;
2339                         kfree(buf);
2340
2341                         retval = hub_port_reset(hub, port1, udev, delay);
2342                         if (retval < 0)         /* error or disconnect */
2343                                 goto fail;
2344                         if (oldspeed != udev->speed) {
2345                                 dev_dbg(&udev->dev,
2346                                         "device reset changed speed!\n");
2347                                 retval = -ENODEV;
2348                                 goto fail;
2349                         }
2350                         if (r) {
2351                                 dev_err(&udev->dev, "device descriptor "
2352                                                 "read/%s, error %d\n",
2353                                                 "64", r);
2354                                 retval = -EMSGSIZE;
2355                                 continue;
2356                         }
2357 #undef GET_DESCRIPTOR_BUFSIZE
2358                 }
2359
2360                 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2361                         retval = hub_set_address(udev);
2362                         if (retval >= 0)
2363                                 break;
2364                         msleep(200);
2365                 }
2366                 if (retval < 0) {
2367                         dev_err(&udev->dev,
2368                                 "device not accepting address %d, error %d\n",
2369                                 udev->devnum, retval);
2370                         goto fail;
2371                 }
2372
2373                 /* cope with hardware quirkiness:
2374                  *  - let SET_ADDRESS settle, some device hardware wants it
2375                  *  - read ep0 maxpacket even for high and low speed,
2376                  */
2377                 msleep(10);
2378                 if (USE_NEW_SCHEME(retry_counter))
2379                         break;
2380
2381                 retval = usb_get_device_descriptor(udev, 8);
2382                 if (retval < 8) {
2383                         dev_err(&udev->dev, "device descriptor "
2384                                         "read/%s, error %d\n",
2385                                         "8", retval);
2386                         if (retval >= 0)
2387                                 retval = -EMSGSIZE;
2388                 } else {
2389                         retval = 0;
2390                         break;
2391                 }
2392         }
2393         if (retval)
2394                 goto fail;
2395
2396         i = udev->descriptor.bMaxPacketSize0;
2397         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2398                 if (udev->speed != USB_SPEED_FULL ||
2399                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2400                         dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2401                         retval = -EMSGSIZE;
2402                         goto fail;
2403                 }
2404                 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2405                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2406                 ep0_reinit(udev);
2407         }
2408
2409         retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2410         if (retval < (signed)sizeof(udev->descriptor)) {
2411                 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2412                         "all", retval);
2413                 if (retval >= 0)
2414                         retval = -ENOMSG;
2415                 goto fail;
2416         }
2417
2418         retval = 0;
2419
2420 fail:
2421         if (retval)
2422                 hub_port_disable(hub, port1, 0);
2423         mutex_unlock(&usb_address0_mutex);
2424         return retval;
2425 }
2426
2427 static void
2428 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2429 {
2430         struct usb_qualifier_descriptor *qual;
2431         int                             status;
2432
2433         qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2434         if (qual == NULL)
2435                 return;
2436
2437         status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2438                         qual, sizeof *qual);
2439         if (status == sizeof *qual) {
2440                 dev_info(&udev->dev, "not running at top speed; "
2441                         "connect to a high speed hub\n");
2442                 /* hub LEDs are probably harder to miss than syslog */
2443                 if (hub->has_indicators) {
2444                         hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2445                         schedule_work (&hub->leds);
2446                 }
2447         }
2448         kfree(qual);
2449 }
2450
2451 static unsigned
2452 hub_power_remaining (struct usb_hub *hub)
2453 {
2454         struct usb_device *hdev = hub->hdev;
2455         int remaining;
2456         int port1;
2457
2458         if (!hub->limited_power)
2459                 return 0;
2460
2461         remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2462         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2463                 struct usb_device       *udev = hdev->children[port1 - 1];
2464                 int                     delta;
2465
2466                 if (!udev)
2467                         continue;
2468
2469                 /* Unconfigured devices may not use more than 100mA,
2470                  * or 8mA for OTG ports */
2471                 if (udev->actconfig)
2472                         delta = udev->actconfig->desc.bMaxPower * 2;
2473                 else if (port1 != udev->bus->otg_port || hdev->parent)
2474                         delta = 100;
2475                 else
2476                         delta = 8;
2477                 if (delta > hub->mA_per_port)
2478                         dev_warn(&udev->dev, "%dmA is over %umA budget "
2479                                         "for port %d!\n",
2480                                         delta, hub->mA_per_port, port1);
2481                 remaining -= delta;
2482         }
2483         if (remaining < 0) {
2484                 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2485                         - remaining);
2486                 remaining = 0;
2487         }
2488         return remaining;
2489 }
2490
2491 /* Handle physical or logical connection change events.
2492  * This routine is called when:
2493  *      a port connection-change occurs;
2494  *      a port enable-change occurs (often caused by EMI);
2495  *      usb_reset_device() encounters changed descriptors (as from
2496  *              a firmware download)
2497  * caller already locked the hub
2498  */
2499 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2500                                         u16 portstatus, u16 portchange)
2501 {
2502         struct usb_device *hdev = hub->hdev;
2503         struct device *hub_dev = hub->intfdev;
2504         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2505         int status, i;
2506
2507         dev_dbg (hub_dev,
2508                 "port %d, status %04x, change %04x, %s\n",
2509                 port1, portstatus, portchange, portspeed (portstatus));
2510
2511         if (hub->has_indicators) {
2512                 set_port_led(hub, port1, HUB_LED_AUTO);
2513                 hub->indicator[port1-1] = INDICATOR_AUTO;
2514         }
2515
2516         /* Disconnect any existing devices under this port */
2517         if (hdev->children[port1-1])
2518                 usb_disconnect(&hdev->children[port1-1]);
2519         clear_bit(port1, hub->change_bits);
2520
2521 #ifdef  CONFIG_USB_OTG
2522         /* during HNP, don't repeat the debounce */
2523         if (hdev->bus->is_b_host)
2524                 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2525 #endif
2526
2527         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2528                 status = hub_port_debounce(hub, port1);
2529                 if (status < 0) {
2530                         dev_err (hub_dev,
2531                                 "connect-debounce failed, port %d disabled\n",
2532                                 port1);
2533                         goto done;
2534                 }
2535                 portstatus = status;
2536         }
2537
2538         /* Return now if nothing is connected */
2539         if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2540
2541                 /* maybe switch power back on (e.g. root hub was reset) */
2542                 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2543                                 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2544                         set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2545
2546                 if (portstatus & USB_PORT_STAT_ENABLE)
2547                         goto done;
2548                 return;
2549         }
2550
2551 #ifdef  CONFIG_USB_SUSPEND
2552         /* If something is connected, but the port is suspended, wake it up. */
2553         if (portstatus & USB_PORT_STAT_SUSPEND) {
2554                 status = hub_port_resume(hub, port1, NULL);
2555                 if (status < 0) {
2556                         dev_dbg(hub_dev,
2557                                 "can't clear suspend on port %d; %d\n",
2558                                 port1, status);
2559                         goto done;
2560                 }
2561         }
2562 #endif
2563
2564         for (i = 0; i < SET_CONFIG_TRIES; i++) {
2565                 struct usb_device *udev;
2566
2567                 /* reallocate for each attempt, since references
2568                  * to the previous one can escape in various ways
2569                  */
2570                 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2571                 if (!udev) {
2572                         dev_err (hub_dev,
2573                                 "couldn't allocate port %d usb_device\n",
2574                                 port1);
2575                         goto done;
2576                 }
2577
2578                 usb_set_device_state(udev, USB_STATE_POWERED);
2579                 udev->speed = USB_SPEED_UNKNOWN;
2580                 udev->bus_mA = hub->mA_per_port;
2581
2582                 /* set the address */
2583                 choose_address(udev);
2584                 if (udev->devnum <= 0) {
2585                         status = -ENOTCONN;     /* Don't retry */
2586                         goto loop;
2587                 }
2588
2589                 /* reset and get descriptor */
2590                 status = hub_port_init(hub, udev, port1, i);
2591                 if (status < 0)
2592                         goto loop;
2593
2594                 /* consecutive bus-powered hubs aren't reliable; they can
2595                  * violate the voltage drop budget.  if the new child has
2596                  * a "powered" LED, users should notice we didn't enable it
2597                  * (without reading syslog), even without per-port LEDs
2598                  * on the parent.
2599                  */
2600                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2601                                 && udev->bus_mA <= 100) {
2602                         u16     devstat;
2603
2604                         status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2605                                         &devstat);
2606                         if (status < 2) {
2607                                 dev_dbg(&udev->dev, "get status %d ?\n", status);
2608                                 goto loop_disable;
2609                         }
2610                         le16_to_cpus(&devstat);
2611                         if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2612                                 dev_err(&udev->dev,
2613                                         "can't connect bus-powered hub "
2614                                         "to this port\n");
2615                                 if (hub->has_indicators) {
2616                                         hub->indicator[port1-1] =
2617                                                 INDICATOR_AMBER_BLINK;
2618                                         schedule_work (&hub->leds);
2619                                 }
2620                                 status = -ENOTCONN;     /* Don't retry */
2621                                 goto loop_disable;
2622                         }
2623                 }
2624
2625                 /* check for devices running slower than they could */
2626                 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2627                                 && udev->speed == USB_SPEED_FULL
2628                                 && highspeed_hubs != 0)
2629                         check_highspeed (hub, udev, port1);
2630
2631                 /* Store the parent's children[] pointer.  At this point
2632                  * udev becomes globally accessible, although presumably
2633                  * no one will look at it until hdev is unlocked.
2634                  */
2635                 status = 0;
2636
2637                 /* We mustn't add new devices if the parent hub has
2638                  * been disconnected; we would race with the
2639                  * recursively_mark_NOTATTACHED() routine.
2640                  */
2641                 spin_lock_irq(&device_state_lock);
2642                 if (hdev->state == USB_STATE_NOTATTACHED)
2643                         status = -ENOTCONN;
2644                 else
2645                         hdev->children[port1-1] = udev;
2646                 spin_unlock_irq(&device_state_lock);
2647
2648                 /* Run it through the hoops (find a driver, etc) */
2649                 if (!status) {
2650                         status = usb_new_device(udev);
2651                         if (status) {
2652                                 spin_lock_irq(&device_state_lock);
2653                                 hdev->children[port1-1] = NULL;
2654                                 spin_unlock_irq(&device_state_lock);
2655                         }
2656                 }
2657
2658                 if (status)
2659                         goto loop_disable;
2660
2661                 status = hub_power_remaining(hub);
2662                 if (status)
2663                         dev_dbg(hub_dev, "%dmA power budget left\n", status);
2664
2665                 return;
2666
2667 loop_disable:
2668                 hub_port_disable(hub, port1, 1);
2669 loop:
2670                 ep0_reinit(udev);
2671                 release_address(udev);
2672                 usb_put_dev(udev);
2673                 if (status == -ENOTCONN)
2674                         break;
2675         }
2676
2677 done:
2678         hub_port_disable(hub, port1, 1);
2679 }
2680
2681 static void hub_events(void)
2682 {
2683         struct list_head *tmp;
2684         struct usb_device *hdev;
2685         struct usb_interface *intf;
2686         struct usb_hub *hub;
2687         struct device *hub_dev;
2688         u16 hubstatus;
2689         u16 hubchange;
2690         u16 portstatus;
2691         u16 portchange;
2692         int i, ret;
2693         int connect_change;
2694
2695         /*
2696          *  We restart the list every time to avoid a deadlock with
2697          * deleting hubs downstream from this one. This should be
2698          * safe since we delete the hub from the event list.
2699          * Not the most efficient, but avoids deadlocks.
2700          */
2701         while (1) {
2702
2703                 /* Grab the first entry at the beginning of the list */
2704                 spin_lock_irq(&hub_event_lock);
2705                 if (list_empty(&hub_event_list)) {
2706                         spin_unlock_irq(&hub_event_lock);
2707                         break;
2708                 }
2709
2710                 tmp = hub_event_list.next;
2711                 list_del_init(tmp);
2712
2713                 hub = list_entry(tmp, struct usb_hub, event_list);
2714                 hdev = hub->hdev;
2715                 intf = to_usb_interface(hub->intfdev);
2716                 hub_dev = &intf->dev;
2717
2718                 i = hub->resume_root_hub;
2719
2720                 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2721                                 hdev->state, hub->descriptor
2722                                         ? hub->descriptor->bNbrPorts
2723                                         : 0,
2724                                 /* NOTE: expects max 15 ports... */
2725                                 (u16) hub->change_bits[0],
2726                                 (u16) hub->event_bits[0],
2727                                 i ? ", resume root" : "");
2728
2729                 usb_get_intf(intf);
2730                 spin_unlock_irq(&hub_event_lock);
2731
2732                 /* Is this is a root hub wanting to reactivate the downstream
2733                  * ports?  If so, be sure the interface resumes even if its
2734                  * stub "device" node was never suspended.
2735                  */
2736                 if (i) {
2737                         dpm_runtime_resume(&hdev->dev);
2738                         dpm_runtime_resume(&intf->dev);
2739                         usb_put_intf(intf);
2740                         continue;
2741                 }
2742
2743                 /* Lock the device, then check to see if we were
2744                  * disconnected while waiting for the lock to succeed. */
2745                 if (locktree(hdev) < 0) {
2746                         usb_put_intf(intf);
2747                         continue;
2748                 }
2749                 if (hub != usb_get_intfdata(intf))
2750                         goto loop;
2751
2752                 /* If the hub has died, clean up after it */
2753                 if (hdev->state == USB_STATE_NOTATTACHED) {
2754                         hub->error = -ENODEV;
2755                         hub_pre_reset(intf);
2756                         goto loop;
2757                 }
2758
2759                 /* If this is an inactive or suspended hub, do nothing */
2760                 if (hub->quiescing)
2761                         goto loop;
2762
2763                 if (hub->error) {
2764                         dev_dbg (hub_dev, "resetting for error %d\n",
2765                                 hub->error);
2766
2767                         ret = usb_reset_composite_device(hdev, intf);
2768                         if (ret) {
2769                                 dev_dbg (hub_dev,
2770                                         "error resetting hub: %d\n", ret);
2771                                 goto loop;
2772                         }
2773
2774                         hub->nerrors = 0;
2775                         hub->error = 0;
2776                 }
2777
2778                 /* deal with port status changes */
2779                 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2780                         if (test_bit(i, hub->busy_bits))
2781                                 continue;
2782                         connect_change = test_bit(i, hub->change_bits);
2783                         if (!test_and_clear_bit(i, hub->event_bits) &&
2784                                         !connect_change && !hub->activating)
2785                                 continue;
2786
2787                         ret = hub_port_status(hub, i,
2788                                         &portstatus, &portchange);
2789                         if (ret < 0)
2790                                 continue;
2791
2792                         if (hub->activating && !hdev->children[i-1] &&
2793                                         (portstatus &
2794                                                 USB_PORT_STAT_CONNECTION))
2795                                 connect_change = 1;
2796
2797                         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2798                                 clear_port_feature(hdev, i,
2799                                         USB_PORT_FEAT_C_CONNECTION);
2800                                 connect_change = 1;
2801                         }
2802
2803                         if (portchange & USB_PORT_STAT_C_ENABLE) {
2804                                 if (!connect_change)
2805                                         dev_dbg (hub_dev,
2806                                                 "port %d enable change, "
2807                                                 "status %08x\n",
2808                                                 i, portstatus);
2809                                 clear_port_feature(hdev, i,
2810                                         USB_PORT_FEAT_C_ENABLE);
2811
2812                                 /*
2813                                  * EM interference sometimes causes badly
2814                                  * shielded USB devices to be shutdown by
2815                                  * the hub, this hack enables them again.
2816                                  * Works at least with mouse driver.
2817                                  */
2818                                 if (!(portstatus & USB_PORT_STAT_ENABLE)
2819                                     && !connect_change
2820                                     && hdev->children[i-1]) {
2821                                         dev_err (hub_dev,
2822                                             "port %i "
2823                                             "disabled by hub (EMI?), "
2824                                             "re-enabling...\n",
2825                                                 i);
2826                                         connect_change = 1;
2827                                 }
2828                         }
2829
2830                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2831                                 clear_port_feature(hdev, i,
2832                                         USB_PORT_FEAT_C_SUSPEND);
2833                                 if (hdev->children[i-1]) {
2834                                         ret = remote_wakeup(hdev->
2835                                                         children[i-1]);
2836                                         if (ret < 0)
2837                                                 connect_change = 1;
2838                                 } else {
2839                                         ret = -ENODEV;
2840                                         hub_port_disable(hub, i, 1);
2841                                 }
2842                                 dev_dbg (hub_dev,
2843                                         "resume on port %d, status %d\n",
2844                                         i, ret);
2845                         }
2846
2847                         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2848                                 dev_err (hub_dev,
2849                                         "over-current change on port %d\n",
2850                                         i);
2851                                 clear_port_feature(hdev, i,
2852                                         USB_PORT_FEAT_C_OVER_CURRENT);
2853                                 hub_power_on(hub);
2854                         }
2855
2856                         if (portchange & USB_PORT_STAT_C_RESET) {
2857                                 dev_dbg (hub_dev,
2858                                         "reset change on port %d\n",
2859                                         i);
2860                                 clear_port_feature(hdev, i,
2861                                         USB_PORT_FEAT_C_RESET);
2862                         }
2863
2864                         if (connect_change)
2865                                 hub_port_connect_change(hub, i,
2866                                                 portstatus, portchange);
2867                 } /* end for i */
2868
2869                 /* deal with hub status changes */
2870                 if (test_and_clear_bit(0, hub->event_bits) == 0)
2871                         ;       /* do nothing */
2872                 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2873                         dev_err (hub_dev, "get_hub_status failed\n");
2874                 else {
2875                         if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2876                                 dev_dbg (hub_dev, "power change\n");
2877                                 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2878                                 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2879                                         /* FIXME: Is this always true? */
2880                                         hub->limited_power = 0;
2881                                 else
2882                                         hub->limited_power = 1;
2883                         }
2884                         if (hubchange & HUB_CHANGE_OVERCURRENT) {
2885                                 dev_dbg (hub_dev, "overcurrent change\n");
2886                                 msleep(500);    /* Cool down */
2887                                 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2888                                 hub_power_on(hub);
2889                         }
2890                 }
2891
2892                 hub->activating = 0;
2893
2894                 /* If this is a root hub, tell the HCD it's okay to
2895                  * re-enable port-change interrupts now. */
2896                 if (!hdev->parent)
2897                         usb_enable_root_hub_irq(hdev->bus);
2898
2899 loop:
2900                 usb_unlock_device(hdev);
2901                 usb_put_intf(intf);
2902
2903         } /* end while (1) */
2904 }
2905
2906 static int hub_thread(void *__unused)
2907 {
2908         do {
2909                 hub_events();
2910                 wait_event_interruptible(khubd_wait,
2911                                 !list_empty(&hub_event_list) ||
2912                                 kthread_should_stop());
2913                 try_to_freeze();
2914         } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2915
2916         pr_debug("%s: khubd exiting\n", usbcore_name);
2917         return 0;
2918 }
2919
2920 static struct usb_device_id hub_id_table [] = {
2921     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2922       .bDeviceClass = USB_CLASS_HUB},
2923     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2924       .bInterfaceClass = USB_CLASS_HUB},
2925     { }                                         /* Terminating entry */
2926 };
2927
2928 MODULE_DEVICE_TABLE (usb, hub_id_table);
2929
2930 static struct usb_driver hub_driver = {
2931         .name =         "hub",
2932         .probe =        hub_probe,
2933         .disconnect =   hub_disconnect,
2934         .suspend =      hub_suspend,
2935         .resume =       hub_resume,
2936         .pre_reset =    hub_pre_reset,
2937         .post_reset =   hub_post_reset,
2938         .ioctl =        hub_ioctl,
2939         .id_table =     hub_id_table,
2940 };
2941
2942 int usb_hub_init(void)
2943 {
2944         if (usb_register(&hub_driver) < 0) {
2945                 printk(KERN_ERR "%s: can't register hub driver\n",
2946                         usbcore_name);
2947                 return -1;
2948         }
2949
2950         khubd_task = kthread_run(hub_thread, NULL, "khubd");
2951         if (!IS_ERR(khubd_task))
2952                 return 0;
2953
2954         /* Fall through if kernel_thread failed */
2955         usb_deregister(&hub_driver);
2956         printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2957
2958         return -1;
2959 }
2960
2961 void usb_hub_cleanup(void)
2962 {
2963         kthread_stop(khubd_task);
2964
2965         /*
2966          * Hub resources are freed for us by usb_deregister. It calls
2967          * usb_driver_purge on every device which in turn calls that
2968          * devices disconnect function if it is using this driver.
2969          * The hub_disconnect function takes care of releasing the
2970          * individual hub resources. -greg
2971          */
2972         usb_deregister(&hub_driver);
2973 } /* usb_hub_cleanup() */
2974
2975 static int config_descriptors_changed(struct usb_device *udev)
2976 {
2977         unsigned                        index;
2978         unsigned                        len = 0;
2979         struct usb_config_descriptor    *buf;
2980
2981         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2982                 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2983                         len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2984         }
2985         buf = kmalloc (len, SLAB_KERNEL);
2986         if (buf == NULL) {
2987                 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2988                 /* assume the worst */
2989                 return 1;
2990         }
2991         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2992                 int length;
2993                 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2994
2995                 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2996                                 old_length);
2997                 if (length < old_length) {
2998                         dev_dbg(&udev->dev, "config index %d, error %d\n",
2999                                         index, length);
3000                         break;
3001                 }
3002                 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3003                                 != 0) {
3004                         dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3005                                 index, buf->bConfigurationValue);
3006                         break;
3007                 }
3008         }
3009         kfree(buf);
3010         return index != udev->descriptor.bNumConfigurations;
3011 }
3012
3013 /**
3014  * usb_reset_device - perform a USB port reset to reinitialize a device
3015  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3016  *
3017  * WARNING - don't use this routine to reset a composite device
3018  * (one with multiple interfaces owned by separate drivers)!
3019  * Use usb_reset_composite_device() instead.
3020  *
3021  * Do a port reset, reassign the device's address, and establish its
3022  * former operating configuration.  If the reset fails, or the device's
3023  * descriptors change from their values before the reset, or the original
3024  * configuration and altsettings cannot be restored, a flag will be set
3025  * telling khubd to pretend the device has been disconnected and then
3026  * re-connected.  All drivers will be unbound, and the device will be
3027  * re-enumerated and probed all over again.
3028  *
3029  * Returns 0 if the reset succeeded, -ENODEV if the device has been
3030  * flagged for logical disconnection, or some other negative error code
3031  * if the reset wasn't even attempted.
3032  *
3033  * The caller must own the device lock.  For example, it's safe to use
3034  * this from a driver probe() routine after downloading new firmware.
3035  * For calls that might not occur during probe(), drivers should lock
3036  * the device using usb_lock_device_for_reset().
3037  */
3038 int usb_reset_device(struct usb_device *udev)
3039 {
3040         struct usb_device               *parent_hdev = udev->parent;
3041         struct usb_hub                  *parent_hub;
3042         struct usb_device_descriptor    descriptor = udev->descriptor;
3043         int                             i, ret = 0;
3044         int                             port1 = udev->portnum;
3045
3046         if (udev->state == USB_STATE_NOTATTACHED ||
3047                         udev->state == USB_STATE_SUSPENDED) {
3048                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3049                                 udev->state);
3050                 return -EINVAL;
3051         }
3052
3053         if (!parent_hdev) {
3054                 /* this requires hcd-specific logic; see OHCI hc_restart() */
3055                 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
3056                 return -EISDIR;
3057         }
3058         parent_hub = hdev_to_hub(parent_hdev);
3059
3060         set_bit(port1, parent_hub->busy_bits);
3061         for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3062
3063                 /* ep0 maxpacket size may change; let the HCD know about it.
3064                  * Other endpoints will be handled by re-enumeration. */
3065                 ep0_reinit(udev);
3066                 ret = hub_port_init(parent_hub, udev, port1, i);
3067                 if (ret >= 0)
3068                         break;
3069         }
3070         clear_bit(port1, parent_hub->busy_bits);
3071         if (ret < 0)
3072                 goto re_enumerate;
3073
3074         /* Device might have changed firmware (DFU or similar) */
3075         if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3076                         || config_descriptors_changed (udev)) {
3077                 dev_info(&udev->dev, "device firmware changed\n");
3078                 udev->descriptor = descriptor;  /* for disconnect() calls */
3079                 goto re_enumerate;
3080         }
3081
3082         if (!udev->actconfig)
3083                 goto done;
3084
3085         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3086                         USB_REQ_SET_CONFIGURATION, 0,
3087                         udev->actconfig->desc.bConfigurationValue, 0,
3088                         NULL, 0, USB_CTRL_SET_TIMEOUT);
3089         if (ret < 0) {
3090                 dev_err(&udev->dev,
3091                         "can't restore configuration #%d (error=%d)\n",
3092                         udev->actconfig->desc.bConfigurationValue, ret);
3093                 goto re_enumerate;
3094         }
3095         usb_set_device_state(udev, USB_STATE_CONFIGURED);
3096
3097         for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3098                 struct usb_interface *intf = udev->actconfig->interface[i];
3099                 struct usb_interface_descriptor *desc;
3100
3101                 /* set_interface resets host side toggle even
3102                  * for altsetting zero.  the interface may have no driver.
3103                  */
3104                 desc = &intf->cur_altsetting->desc;
3105                 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3106                         desc->bAlternateSetting);
3107                 if (ret < 0) {
3108                         dev_err(&udev->dev, "failed to restore interface %d "
3109                                 "altsetting %d (error=%d)\n",
3110                                 desc->bInterfaceNumber,
3111                                 desc->bAlternateSetting,
3112                                 ret);
3113                         goto re_enumerate;
3114                 }
3115         }
3116
3117 done:
3118         return 0;
3119
3120 re_enumerate:
3121         hub_port_logical_disconnect(parent_hub, port1);
3122         return -ENODEV;
3123 }
3124
3125 /**
3126  * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3127  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3128  * @iface: interface bound to the driver making the request (optional)
3129  *
3130  * Warns all drivers bound to registered interfaces (using their pre_reset
3131  * method), performs the port reset, and then lets the drivers know that
3132  * the reset is over (using their post_reset method).
3133  *
3134  * Return value is the same as for usb_reset_device().
3135  *
3136  * The caller must own the device lock.  For example, it's safe to use
3137  * this from a driver probe() routine after downloading new firmware.
3138  * For calls that might not occur during probe(), drivers should lock
3139  * the device using usb_lock_device_for_reset().
3140  *
3141  * The interface locks are acquired during the pre_reset stage and released
3142  * during the post_reset stage.  However if iface is not NULL and is
3143  * currently being probed, we assume that the caller already owns its
3144  * lock.
3145  */
3146 int usb_reset_composite_device(struct usb_device *udev,
3147                 struct usb_interface *iface)
3148 {
3149         int ret;
3150         struct usb_host_config *config = udev->actconfig;
3151
3152         if (udev->state == USB_STATE_NOTATTACHED ||
3153                         udev->state == USB_STATE_SUSPENDED) {
3154                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3155                                 udev->state);
3156                 return -EINVAL;
3157         }
3158
3159         if (iface && iface->condition != USB_INTERFACE_BINDING)
3160                 iface = NULL;
3161
3162         if (config) {
3163                 int i;
3164                 struct usb_interface *cintf;
3165                 struct usb_driver *drv;
3166
3167                 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3168                         cintf = config->interface[i];
3169                         if (cintf != iface)
3170                                 down(&cintf->dev.sem);
3171                         if (device_is_registered(&cintf->dev) &&
3172                                         cintf->dev.driver) {
3173                                 drv = to_usb_driver(cintf->dev.driver);
3174                                 if (drv->pre_reset)
3175                                         (drv->pre_reset)(cintf);
3176                         }
3177                 }
3178         }
3179
3180         ret = usb_reset_device(udev);
3181
3182         if (config) {
3183                 int i;
3184                 struct usb_interface *cintf;
3185                 struct usb_driver *drv;
3186
3187                 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3188                         cintf = config->interface[i];
3189                         if (device_is_registered(&cintf->dev) &&
3190                                         cintf->dev.driver) {
3191                                 drv = to_usb_driver(cintf->dev.driver);
3192                                 if (drv->post_reset)
3193                                         (drv->post_reset)(cintf);
3194                         }
3195                         if (cintf != iface)
3196                                 up(&cintf->dev.sem);
3197                 }
3198         }
3199
3200         return ret;
3201 }