Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/smp_lock.h>
20 #include <linux/ioctl.h>
21 #include <linux/usb.h>
22 #include <linux/usbdevice_fs.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
25
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
29
30 #include "usb.h"
31 #include "hcd.h"
32 #include "hub.h"
33
34 /* Protect struct usb_device->state and ->children members
35  * Note: Both are also protected by ->dev.sem, except that ->state can
36  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37 static DEFINE_SPINLOCK(device_state_lock);
38
39 /* khubd's worklist and its lock */
40 static DEFINE_SPINLOCK(hub_event_lock);
41 static LIST_HEAD(hub_event_list);       /* List of hubs needing servicing */
42
43 /* Wakes up khubd */
44 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
46 static struct task_struct *khubd_task;
47
48 /* cycle leds on hubs that aren't blinking for attention */
49 static int blinkenlights = 0;
50 module_param (blinkenlights, bool, S_IRUGO);
51 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53 /*
54  * As of 2.6.10 we introduce a new USB device initialization scheme which
55  * closely resembles the way Windows works.  Hopefully it will be compatible
56  * with a wider range of devices than the old scheme.  However some previously
57  * working devices may start giving rise to "device not accepting address"
58  * errors; if that happens the user can try the old scheme by adjusting the
59  * following module parameters.
60  *
61  * For maximum flexibility there are two boolean parameters to control the
62  * hub driver's behavior.  On the first initialization attempt, if the
63  * "old_scheme_first" parameter is set then the old scheme will be used,
64  * otherwise the new scheme is used.  If that fails and "use_both_schemes"
65  * is set, then the driver will make another attempt, using the other scheme.
66  */
67 static int old_scheme_first = 0;
68 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(old_scheme_first,
70                  "start with the old device initialization scheme");
71
72 static int use_both_schemes = 1;
73 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74 MODULE_PARM_DESC(use_both_schemes,
75                 "try the other device initialization scheme if the "
76                 "first one fails");
77
78
79 #ifdef  DEBUG
80 static inline char *portspeed (int portstatus)
81 {
82         if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83                 return "480 Mb/s";
84         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85                 return "1.5 Mb/s";
86         else
87                 return "12 Mb/s";
88 }
89 #endif
90
91 /* Note that hdev or one of its children must be locked! */
92 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93 {
94         return usb_get_intfdata(hdev->actconfig->interface[0]);
95 }
96
97 /* USB 2.0 spec Section 11.24.4.5 */
98 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99 {
100         int i, ret;
101
102         for (i = 0; i < 3; i++) {
103                 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105                         USB_DT_HUB << 8, 0, data, size,
106                         USB_CTRL_GET_TIMEOUT);
107                 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108                         return ret;
109         }
110         return -EINVAL;
111 }
112
113 /*
114  * USB 2.0 spec Section 11.24.2.1
115  */
116 static int clear_hub_feature(struct usb_device *hdev, int feature)
117 {
118         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119                 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120 }
121
122 /*
123  * USB 2.0 spec Section 11.24.2.2
124  */
125 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126 {
127         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129                 NULL, 0, 1000);
130 }
131
132 /*
133  * USB 2.0 spec Section 11.24.2.13
134  */
135 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136 {
137         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139                 NULL, 0, 1000);
140 }
141
142 /*
143  * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144  * for info about using port indicators
145  */
146 static void set_port_led(
147         struct usb_hub *hub,
148         int port1,
149         int selector
150 )
151 {
152         int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153                         USB_PORT_FEAT_INDICATOR);
154         if (status < 0)
155                 dev_dbg (hub->intfdev,
156                         "port %d indicator %s status %d\n",
157                         port1,
158                         ({ char *s; switch (selector) {
159                         case HUB_LED_AMBER: s = "amber"; break;
160                         case HUB_LED_GREEN: s = "green"; break;
161                         case HUB_LED_OFF: s = "off"; break;
162                         case HUB_LED_AUTO: s = "auto"; break;
163                         default: s = "??"; break;
164                         }; s; }),
165                         status);
166 }
167
168 #define LED_CYCLE_PERIOD        ((2*HZ)/3)
169
170 static void led_work (void *__hub)
171 {
172         struct usb_hub          *hub = __hub;
173         struct usb_device       *hdev = hub->hdev;
174         unsigned                i;
175         unsigned                changed = 0;
176         int                     cursor = -1;
177
178         if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179                 return;
180
181         for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182                 unsigned        selector, mode;
183
184                 /* 30%-50% duty cycle */
185
186                 switch (hub->indicator[i]) {
187                 /* cycle marker */
188                 case INDICATOR_CYCLE:
189                         cursor = i;
190                         selector = HUB_LED_AUTO;
191                         mode = INDICATOR_AUTO;
192                         break;
193                 /* blinking green = sw attention */
194                 case INDICATOR_GREEN_BLINK:
195                         selector = HUB_LED_GREEN;
196                         mode = INDICATOR_GREEN_BLINK_OFF;
197                         break;
198                 case INDICATOR_GREEN_BLINK_OFF:
199                         selector = HUB_LED_OFF;
200                         mode = INDICATOR_GREEN_BLINK;
201                         break;
202                 /* blinking amber = hw attention */
203                 case INDICATOR_AMBER_BLINK:
204                         selector = HUB_LED_AMBER;
205                         mode = INDICATOR_AMBER_BLINK_OFF;
206                         break;
207                 case INDICATOR_AMBER_BLINK_OFF:
208                         selector = HUB_LED_OFF;
209                         mode = INDICATOR_AMBER_BLINK;
210                         break;
211                 /* blink green/amber = reserved */
212                 case INDICATOR_ALT_BLINK:
213                         selector = HUB_LED_GREEN;
214                         mode = INDICATOR_ALT_BLINK_OFF;
215                         break;
216                 case INDICATOR_ALT_BLINK_OFF:
217                         selector = HUB_LED_AMBER;
218                         mode = INDICATOR_ALT_BLINK;
219                         break;
220                 default:
221                         continue;
222                 }
223                 if (selector != HUB_LED_AUTO)
224                         changed = 1;
225                 set_port_led(hub, i + 1, selector);
226                 hub->indicator[i] = mode;
227         }
228         if (!changed && blinkenlights) {
229                 cursor++;
230                 cursor %= hub->descriptor->bNbrPorts;
231                 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232                 hub->indicator[cursor] = INDICATOR_CYCLE;
233                 changed++;
234         }
235         if (changed)
236                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237 }
238
239 /* use a short timeout for hub/port status fetches */
240 #define USB_STS_TIMEOUT         1000
241 #define USB_STS_RETRIES         5
242
243 /*
244  * USB 2.0 spec Section 11.24.2.6
245  */
246 static int get_hub_status(struct usb_device *hdev,
247                 struct usb_hub_status *data)
248 {
249         int i, status = -ETIMEDOUT;
250
251         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254                         data, sizeof(*data), USB_STS_TIMEOUT);
255         }
256         return status;
257 }
258
259 /*
260  * USB 2.0 spec Section 11.24.2.7
261  */
262 static int get_port_status(struct usb_device *hdev, int port1,
263                 struct usb_port_status *data)
264 {
265         int i, status = -ETIMEDOUT;
266
267         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270                         data, sizeof(*data), USB_STS_TIMEOUT);
271         }
272         return status;
273 }
274
275 static void kick_khubd(struct usb_hub *hub)
276 {
277         unsigned long   flags;
278
279         spin_lock_irqsave(&hub_event_lock, flags);
280         if (list_empty(&hub->event_list)) {
281                 list_add_tail(&hub->event_list, &hub_event_list);
282                 wake_up(&khubd_wait);
283         }
284         spin_unlock_irqrestore(&hub_event_lock, flags);
285 }
286
287 void usb_kick_khubd(struct usb_device *hdev)
288 {
289         kick_khubd(hdev_to_hub(hdev));
290 }
291
292
293 /* completion function, fires on port status changes and various faults */
294 static void hub_irq(struct urb *urb)
295 {
296         struct usb_hub *hub = urb->context;
297         int status;
298         int i;
299         unsigned long bits;
300
301         switch (urb->status) {
302         case -ENOENT:           /* synchronous unlink */
303         case -ECONNRESET:       /* async unlink */
304         case -ESHUTDOWN:        /* hardware going away */
305                 return;
306
307         default:                /* presumably an error */
308                 /* Cause a hub reset after 10 consecutive errors */
309                 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310                 if ((++hub->nerrors < 10) || hub->error)
311                         goto resubmit;
312                 hub->error = urb->status;
313                 /* FALL THROUGH */
314
315         /* let khubd handle things */
316         case 0:                 /* we got data:  port status changed */
317                 bits = 0;
318                 for (i = 0; i < urb->actual_length; ++i)
319                         bits |= ((unsigned long) ((*hub->buffer)[i]))
320                                         << (i*8);
321                 hub->event_bits[0] = bits;
322                 break;
323         }
324
325         hub->nerrors = 0;
326
327         /* Something happened, let khubd figure it out */
328         kick_khubd(hub);
329
330 resubmit:
331         if (hub->quiescing)
332                 return;
333
334         if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335                         && status != -ENODEV && status != -EPERM)
336                 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337 }
338
339 /* USB 2.0 spec Section 11.24.2.3 */
340 static inline int
341 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342 {
343         return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344                                HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345                                tt, NULL, 0, 1000);
346 }
347
348 /*
349  * enumeration blocks khubd for a long time. we use keventd instead, since
350  * long blocking there is the exception, not the rule.  accordingly, HCDs
351  * talking to TTs must queue control transfers (not just bulk and iso), so
352  * both can talk to the same hub concurrently.
353  */
354 static void hub_tt_kevent (void *arg)
355 {
356         struct usb_hub          *hub = arg;
357         unsigned long           flags;
358
359         spin_lock_irqsave (&hub->tt.lock, flags);
360         while (!list_empty (&hub->tt.clear_list)) {
361                 struct list_head        *temp;
362                 struct usb_tt_clear     *clear;
363                 struct usb_device       *hdev = hub->hdev;
364                 int                     status;
365
366                 temp = hub->tt.clear_list.next;
367                 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368                 list_del (&clear->clear_list);
369
370                 /* drop lock so HCD can concurrently report other TT errors */
371                 spin_unlock_irqrestore (&hub->tt.lock, flags);
372                 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373                 spin_lock_irqsave (&hub->tt.lock, flags);
374
375                 if (status)
376                         dev_err (&hdev->dev,
377                                 "clear tt %d (%04x) error %d\n",
378                                 clear->tt, clear->devinfo, status);
379                 kfree(clear);
380         }
381         spin_unlock_irqrestore (&hub->tt.lock, flags);
382 }
383
384 /**
385  * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386  * @udev: the device whose split transaction failed
387  * @pipe: identifies the endpoint of the failed transaction
388  *
389  * High speed HCDs use this to tell the hub driver that some split control or
390  * bulk transaction failed in a way that requires clearing internal state of
391  * a transaction translator.  This is normally detected (and reported) from
392  * interrupt context.
393  *
394  * It may not be possible for that hub to handle additional full (or low)
395  * speed transactions until that state is fully cleared out.
396  */
397 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398 {
399         struct usb_tt           *tt = udev->tt;
400         unsigned long           flags;
401         struct usb_tt_clear     *clear;
402
403         /* we've got to cope with an arbitrary number of pending TT clears,
404          * since each TT has "at least two" buffers that can need it (and
405          * there can be many TTs per hub).  even if they're uncommon.
406          */
407         if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408                 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409                 /* FIXME recover somehow ... RESET_TT? */
410                 return;
411         }
412
413         /* info that CLEAR_TT_BUFFER needs */
414         clear->tt = tt->multi ? udev->ttport : 1;
415         clear->devinfo = usb_pipeendpoint (pipe);
416         clear->devinfo |= udev->devnum << 4;
417         clear->devinfo |= usb_pipecontrol (pipe)
418                         ? (USB_ENDPOINT_XFER_CONTROL << 11)
419                         : (USB_ENDPOINT_XFER_BULK << 11);
420         if (usb_pipein (pipe))
421                 clear->devinfo |= 1 << 15;
422         
423         /* tell keventd to clear state for this TT */
424         spin_lock_irqsave (&tt->lock, flags);
425         list_add_tail (&clear->clear_list, &tt->clear_list);
426         schedule_work (&tt->kevent);
427         spin_unlock_irqrestore (&tt->lock, flags);
428 }
429
430 static void hub_power_on(struct usb_hub *hub)
431 {
432         int port1;
433         unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
434         u16 wHubCharacteristics =
435                         le16_to_cpu(hub->descriptor->wHubCharacteristics);
436
437         /* Enable power on each port.  Some hubs have reserved values
438          * of LPSM (> 2) in their descriptors, even though they are
439          * USB 2.0 hubs.  Some hubs do not implement port-power switching
440          * but only emulate it.  In all cases, the ports won't work
441          * unless we send these messages to the hub.
442          */
443         if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
444                 dev_dbg(hub->intfdev, "enabling power on all ports\n");
445         else
446                 dev_dbg(hub->intfdev, "trying to enable port power on "
447                                 "non-switchable hub\n");
448         for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
449                 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
450
451         /* Wait at least 100 msec for power to become stable */
452         msleep(max(pgood_delay, (unsigned) 100));
453 }
454
455 static void hub_quiesce(struct usb_hub *hub)
456 {
457         /* (nonblocking) khubd and related activity won't re-trigger */
458         hub->quiescing = 1;
459         hub->activating = 0;
460         hub->resume_root_hub = 0;
461
462         /* (blocking) stop khubd and related activity */
463         usb_kill_urb(hub->urb);
464         if (hub->has_indicators)
465                 cancel_delayed_work(&hub->leds);
466         if (hub->has_indicators || hub->tt.hub)
467                 flush_scheduled_work();
468 }
469
470 static void hub_activate(struct usb_hub *hub)
471 {
472         int     status;
473
474         hub->quiescing = 0;
475         hub->activating = 1;
476         hub->resume_root_hub = 0;
477         status = usb_submit_urb(hub->urb, GFP_NOIO);
478         if (status < 0)
479                 dev_err(hub->intfdev, "activate --> %d\n", status);
480         if (hub->has_indicators && blinkenlights)
481                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
482
483         /* scan all ports ASAP */
484         kick_khubd(hub);
485 }
486
487 static int hub_hub_status(struct usb_hub *hub,
488                 u16 *status, u16 *change)
489 {
490         int ret;
491
492         ret = get_hub_status(hub->hdev, &hub->status->hub);
493         if (ret < 0)
494                 dev_err (hub->intfdev,
495                         "%s failed (err = %d)\n", __FUNCTION__, ret);
496         else {
497                 *status = le16_to_cpu(hub->status->hub.wHubStatus);
498                 *change = le16_to_cpu(hub->status->hub.wHubChange); 
499                 ret = 0;
500         }
501         return ret;
502 }
503
504 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
505 {
506         struct usb_device *hdev = hub->hdev;
507         int ret;
508
509         if (hdev->children[port1-1] && set_state) {
510                 usb_set_device_state(hdev->children[port1-1],
511                                 USB_STATE_NOTATTACHED);
512         }
513         ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
514         if (ret)
515                 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
516                         port1, ret);
517
518         return ret;
519 }
520
521
522 /* caller has locked the hub device */
523 static void hub_pre_reset(struct usb_interface *intf)
524 {
525         struct usb_hub *hub = usb_get_intfdata(intf);
526         struct usb_device *hdev = hub->hdev;
527         int port1;
528
529         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
530                 if (hdev->children[port1 - 1]) {
531                         usb_disconnect(&hdev->children[port1 - 1]);
532                         if (hub->error == 0)
533                                 hub_port_disable(hub, port1, 0);
534                 }
535         }
536         hub_quiesce(hub);
537 }
538
539 /* caller has locked the hub device */
540 static void hub_post_reset(struct usb_interface *intf)
541 {
542         struct usb_hub *hub = usb_get_intfdata(intf);
543
544         hub_activate(hub);
545         hub_power_on(hub);
546 }
547
548
549 static int hub_configure(struct usb_hub *hub,
550         struct usb_endpoint_descriptor *endpoint)
551 {
552         struct usb_device *hdev = hub->hdev;
553         struct device *hub_dev = hub->intfdev;
554         u16 hubstatus, hubchange;
555         u16 wHubCharacteristics;
556         unsigned int pipe;
557         int maxp, ret;
558         char *message;
559
560         hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
561                         &hub->buffer_dma);
562         if (!hub->buffer) {
563                 message = "can't allocate hub irq buffer";
564                 ret = -ENOMEM;
565                 goto fail;
566         }
567
568         hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
569         if (!hub->status) {
570                 message = "can't kmalloc hub status buffer";
571                 ret = -ENOMEM;
572                 goto fail;
573         }
574
575         hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
576         if (!hub->descriptor) {
577                 message = "can't kmalloc hub descriptor";
578                 ret = -ENOMEM;
579                 goto fail;
580         }
581
582         /* Request the entire hub descriptor.
583          * hub->descriptor can handle USB_MAXCHILDREN ports,
584          * but the hub can/will return fewer bytes here.
585          */
586         ret = get_hub_descriptor(hdev, hub->descriptor,
587                         sizeof(*hub->descriptor));
588         if (ret < 0) {
589                 message = "can't read hub descriptor";
590                 goto fail;
591         } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
592                 message = "hub has too many ports!";
593                 ret = -ENODEV;
594                 goto fail;
595         }
596
597         hdev->maxchild = hub->descriptor->bNbrPorts;
598         dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
599                 (hdev->maxchild == 1) ? "" : "s");
600
601         wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
602
603         if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
604                 int     i;
605                 char    portstr [USB_MAXCHILDREN + 1];
606
607                 for (i = 0; i < hdev->maxchild; i++)
608                         portstr[i] = hub->descriptor->DeviceRemovable
609                                     [((i + 1) / 8)] & (1 << ((i + 1) % 8))
610                                 ? 'F' : 'R';
611                 portstr[hdev->maxchild] = 0;
612                 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
613         } else
614                 dev_dbg(hub_dev, "standalone hub\n");
615
616         switch (wHubCharacteristics & HUB_CHAR_LPSM) {
617                 case 0x00:
618                         dev_dbg(hub_dev, "ganged power switching\n");
619                         break;
620                 case 0x01:
621                         dev_dbg(hub_dev, "individual port power switching\n");
622                         break;
623                 case 0x02:
624                 case 0x03:
625                         dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
626                         break;
627         }
628
629         switch (wHubCharacteristics & HUB_CHAR_OCPM) {
630                 case 0x00:
631                         dev_dbg(hub_dev, "global over-current protection\n");
632                         break;
633                 case 0x08:
634                         dev_dbg(hub_dev, "individual port over-current protection\n");
635                         break;
636                 case 0x10:
637                 case 0x18:
638                         dev_dbg(hub_dev, "no over-current protection\n");
639                         break;
640         }
641
642         spin_lock_init (&hub->tt.lock);
643         INIT_LIST_HEAD (&hub->tt.clear_list);
644         INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
645         switch (hdev->descriptor.bDeviceProtocol) {
646                 case 0:
647                         break;
648                 case 1:
649                         dev_dbg(hub_dev, "Single TT\n");
650                         hub->tt.hub = hdev;
651                         break;
652                 case 2:
653                         ret = usb_set_interface(hdev, 0, 1);
654                         if (ret == 0) {
655                                 dev_dbg(hub_dev, "TT per port\n");
656                                 hub->tt.multi = 1;
657                         } else
658                                 dev_err(hub_dev, "Using single TT (err %d)\n",
659                                         ret);
660                         hub->tt.hub = hdev;
661                         break;
662                 default:
663                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
664                                 hdev->descriptor.bDeviceProtocol);
665                         break;
666         }
667
668         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
669         switch (wHubCharacteristics & HUB_CHAR_TTTT) {
670                 case HUB_TTTT_8_BITS:
671                         if (hdev->descriptor.bDeviceProtocol != 0) {
672                                 hub->tt.think_time = 666;
673                                 dev_dbg(hub_dev, "TT requires at most %d "
674                                                 "FS bit times (%d ns)\n",
675                                         8, hub->tt.think_time);
676                         }
677                         break;
678                 case HUB_TTTT_16_BITS:
679                         hub->tt.think_time = 666 * 2;
680                         dev_dbg(hub_dev, "TT requires at most %d "
681                                         "FS bit times (%d ns)\n",
682                                 16, hub->tt.think_time);
683                         break;
684                 case HUB_TTTT_24_BITS:
685                         hub->tt.think_time = 666 * 3;
686                         dev_dbg(hub_dev, "TT requires at most %d "
687                                         "FS bit times (%d ns)\n",
688                                 24, hub->tt.think_time);
689                         break;
690                 case HUB_TTTT_32_BITS:
691                         hub->tt.think_time = 666 * 4;
692                         dev_dbg(hub_dev, "TT requires at most %d "
693                                         "FS bit times (%d ns)\n",
694                                 32, hub->tt.think_time);
695                         break;
696         }
697
698         /* probe() zeroes hub->indicator[] */
699         if (wHubCharacteristics & HUB_CHAR_PORTIND) {
700                 hub->has_indicators = 1;
701                 dev_dbg(hub_dev, "Port indicators are supported\n");
702         }
703
704         dev_dbg(hub_dev, "power on to power good time: %dms\n",
705                 hub->descriptor->bPwrOn2PwrGood * 2);
706
707         /* power budgeting mostly matters with bus-powered hubs,
708          * and battery-powered root hubs (may provide just 8 mA).
709          */
710         ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
711         if (ret < 2) {
712                 message = "can't get hub status";
713                 goto fail;
714         }
715         le16_to_cpus(&hubstatus);
716         if (hdev == hdev->bus->root_hub) {
717                 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
718                         hub->mA_per_port = 500;
719                 else {
720                         hub->mA_per_port = hdev->bus_mA;
721                         hub->limited_power = 1;
722                 }
723         } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
724                 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
725                         hub->descriptor->bHubContrCurrent);
726                 hub->limited_power = 1;
727                 if (hdev->maxchild > 0) {
728                         int remaining = hdev->bus_mA -
729                                         hub->descriptor->bHubContrCurrent;
730
731                         if (remaining < hdev->maxchild * 100)
732                                 dev_warn(hub_dev,
733                                         "insufficient power available "
734                                         "to use all downstream ports\n");
735                         hub->mA_per_port = 100;         /* 7.2.1.1 */
736                 }
737         } else {        /* Self-powered external hub */
738                 /* FIXME: What about battery-powered external hubs that
739                  * provide less current per port? */
740                 hub->mA_per_port = 500;
741         }
742         if (hub->mA_per_port < 500)
743                 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
744                                 hub->mA_per_port);
745
746         ret = hub_hub_status(hub, &hubstatus, &hubchange);
747         if (ret < 0) {
748                 message = "can't get hub status";
749                 goto fail;
750         }
751
752         /* local power status reports aren't always correct */
753         if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
754                 dev_dbg(hub_dev, "local power source is %s\n",
755                         (hubstatus & HUB_STATUS_LOCAL_POWER)
756                         ? "lost (inactive)" : "good");
757
758         if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
759                 dev_dbg(hub_dev, "%sover-current condition exists\n",
760                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
761
762         /* set up the interrupt endpoint */
763         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
764         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
765
766         if (maxp > sizeof(*hub->buffer))
767                 maxp = sizeof(*hub->buffer);
768
769         hub->urb = usb_alloc_urb(0, GFP_KERNEL);
770         if (!hub->urb) {
771                 message = "couldn't allocate interrupt urb";
772                 ret = -ENOMEM;
773                 goto fail;
774         }
775
776         usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
777                 hub, endpoint->bInterval);
778         hub->urb->transfer_dma = hub->buffer_dma;
779         hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
780
781         /* maybe cycle the hub leds */
782         if (hub->has_indicators && blinkenlights)
783                 hub->indicator [0] = INDICATOR_CYCLE;
784
785         hub_power_on(hub);
786         hub_activate(hub);
787         return 0;
788
789 fail:
790         dev_err (hub_dev, "config failed, %s (err %d)\n",
791                         message, ret);
792         /* hub_disconnect() frees urb and descriptor */
793         return ret;
794 }
795
796 static unsigned highspeed_hubs;
797
798 static void hub_disconnect(struct usb_interface *intf)
799 {
800         struct usb_hub *hub = usb_get_intfdata (intf);
801         struct usb_device *hdev;
802
803         /* Disconnect all children and quiesce the hub */
804         hub->error = 0;
805         hub_pre_reset(intf);
806
807         usb_set_intfdata (intf, NULL);
808         hdev = hub->hdev;
809
810         if (hdev->speed == USB_SPEED_HIGH)
811                 highspeed_hubs--;
812
813         usb_free_urb(hub->urb);
814         hub->urb = NULL;
815
816         spin_lock_irq(&hub_event_lock);
817         list_del_init(&hub->event_list);
818         spin_unlock_irq(&hub_event_lock);
819
820         kfree(hub->descriptor);
821         hub->descriptor = NULL;
822
823         kfree(hub->status);
824         hub->status = NULL;
825
826         if (hub->buffer) {
827                 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
828                                 hub->buffer_dma);
829                 hub->buffer = NULL;
830         }
831
832         kfree(hub);
833 }
834
835 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
836 {
837         struct usb_host_interface *desc;
838         struct usb_endpoint_descriptor *endpoint;
839         struct usb_device *hdev;
840         struct usb_hub *hub;
841
842         desc = intf->cur_altsetting;
843         hdev = interface_to_usbdev(intf);
844
845 #ifdef  CONFIG_USB_OTG_BLACKLIST_HUB
846         if (hdev->parent) {
847                 dev_warn(&intf->dev, "ignoring external hub\n");
848                 return -ENODEV;
849         }
850 #endif
851
852         /* Some hubs have a subclass of 1, which AFAICT according to the */
853         /*  specs is not defined, but it works */
854         if ((desc->desc.bInterfaceSubClass != 0) &&
855             (desc->desc.bInterfaceSubClass != 1)) {
856 descriptor_error:
857                 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
858                 return -EIO;
859         }
860
861         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
862         if (desc->desc.bNumEndpoints != 1)
863                 goto descriptor_error;
864
865         endpoint = &desc->endpoint[0].desc;
866
867         /* If it's not an interrupt in endpoint, we'd better punt! */
868         if (!usb_endpoint_is_int_in(endpoint))
869                 goto descriptor_error;
870
871         /* We found a hub */
872         dev_info (&intf->dev, "USB hub found\n");
873
874         hub = kzalloc(sizeof(*hub), GFP_KERNEL);
875         if (!hub) {
876                 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
877                 return -ENOMEM;
878         }
879
880         INIT_LIST_HEAD(&hub->event_list);
881         hub->intfdev = &intf->dev;
882         hub->hdev = hdev;
883         INIT_WORK(&hub->leds, led_work, hub);
884
885         usb_set_intfdata (intf, hub);
886
887         if (hdev->speed == USB_SPEED_HIGH)
888                 highspeed_hubs++;
889
890         if (hub_configure(hub, endpoint) >= 0)
891                 return 0;
892
893         hub_disconnect (intf);
894         return -ENODEV;
895 }
896
897 static int
898 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
899 {
900         struct usb_device *hdev = interface_to_usbdev (intf);
901
902         /* assert ifno == 0 (part of hub spec) */
903         switch (code) {
904         case USBDEVFS_HUB_PORTINFO: {
905                 struct usbdevfs_hub_portinfo *info = user_data;
906                 int i;
907
908                 spin_lock_irq(&device_state_lock);
909                 if (hdev->devnum <= 0)
910                         info->nports = 0;
911                 else {
912                         info->nports = hdev->maxchild;
913                         for (i = 0; i < info->nports; i++) {
914                                 if (hdev->children[i] == NULL)
915                                         info->port[i] = 0;
916                                 else
917                                         info->port[i] =
918                                                 hdev->children[i]->devnum;
919                         }
920                 }
921                 spin_unlock_irq(&device_state_lock);
922
923                 return info->nports + 1;
924                 }
925
926         default:
927                 return -ENOSYS;
928         }
929 }
930
931
932 /* grab device/port lock, returning index of that port (zero based).
933  * protects the upstream link used by this device from concurrent
934  * tree operations like suspend, resume, reset, and disconnect, which
935  * apply to everything downstream of a given port.
936  */
937 static int locktree(struct usb_device *udev)
938 {
939         int                     t;
940         struct usb_device       *hdev;
941
942         if (!udev)
943                 return -ENODEV;
944
945         /* root hub is always the first lock in the series */
946         hdev = udev->parent;
947         if (!hdev) {
948                 usb_lock_device(udev);
949                 return 0;
950         }
951
952         /* on the path from root to us, lock everything from
953          * top down, dropping parent locks when not needed
954          */
955         t = locktree(hdev);
956         if (t < 0)
957                 return t;
958
959         /* everything is fail-fast once disconnect
960          * processing starts
961          */
962         if (udev->state == USB_STATE_NOTATTACHED) {
963                 usb_unlock_device(hdev);
964                 return -ENODEV;
965         }
966
967         /* when everyone grabs locks top->bottom,
968          * non-overlapping work may be concurrent
969          */
970         usb_lock_device(udev);
971         usb_unlock_device(hdev);
972         return udev->portnum;
973 }
974
975 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
976 {
977         int i;
978
979         for (i = 0; i < udev->maxchild; ++i) {
980                 if (udev->children[i])
981                         recursively_mark_NOTATTACHED(udev->children[i]);
982         }
983         udev->state = USB_STATE_NOTATTACHED;
984 }
985
986 /**
987  * usb_set_device_state - change a device's current state (usbcore, hcds)
988  * @udev: pointer to device whose state should be changed
989  * @new_state: new state value to be stored
990  *
991  * udev->state is _not_ fully protected by the device lock.  Although
992  * most transitions are made only while holding the lock, the state can
993  * can change to USB_STATE_NOTATTACHED at almost any time.  This
994  * is so that devices can be marked as disconnected as soon as possible,
995  * without having to wait for any semaphores to be released.  As a result,
996  * all changes to any device's state must be protected by the
997  * device_state_lock spinlock.
998  *
999  * Once a device has been added to the device tree, all changes to its state
1000  * should be made using this routine.  The state should _not_ be set directly.
1001  *
1002  * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1003  * Otherwise udev->state is set to new_state, and if new_state is
1004  * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1005  * to USB_STATE_NOTATTACHED.
1006  */
1007 void usb_set_device_state(struct usb_device *udev,
1008                 enum usb_device_state new_state)
1009 {
1010         unsigned long flags;
1011
1012         spin_lock_irqsave(&device_state_lock, flags);
1013         if (udev->state == USB_STATE_NOTATTACHED)
1014                 ;       /* do nothing */
1015         else if (new_state != USB_STATE_NOTATTACHED) {
1016
1017                 /* root hub wakeup capabilities are managed out-of-band
1018                  * and may involve silicon errata ... ignore them here.
1019                  */
1020                 if (udev->parent) {
1021                         if (udev->state == USB_STATE_SUSPENDED
1022                                         || new_state == USB_STATE_SUSPENDED)
1023                                 ;       /* No change to wakeup settings */
1024                         else if (new_state == USB_STATE_CONFIGURED)
1025                                 device_init_wakeup(&udev->dev,
1026                                         (udev->actconfig->desc.bmAttributes
1027                                          & USB_CONFIG_ATT_WAKEUP));
1028                         else
1029                                 device_init_wakeup(&udev->dev, 0);
1030                 }
1031                 udev->state = new_state;
1032         } else
1033                 recursively_mark_NOTATTACHED(udev);
1034         spin_unlock_irqrestore(&device_state_lock, flags);
1035 }
1036
1037
1038 #ifdef  CONFIG_PM
1039
1040 /**
1041  * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1042  * @rhdev: struct usb_device for the root hub
1043  *
1044  * The USB host controller driver calls this function when its root hub
1045  * is resumed and Vbus power has been interrupted or the controller
1046  * has been reset.  The routine marks all the children of the root hub
1047  * as NOTATTACHED and marks logical connect-change events on their ports.
1048  */
1049 void usb_root_hub_lost_power(struct usb_device *rhdev)
1050 {
1051         struct usb_hub *hub;
1052         int port1;
1053         unsigned long flags;
1054
1055         dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1056
1057         /* Make sure no potential wakeup events get lost,
1058          * by forcing the root hub to be resumed.
1059          */
1060         rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1061
1062         spin_lock_irqsave(&device_state_lock, flags);
1063         hub = hdev_to_hub(rhdev);
1064         for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1065                 if (rhdev->children[port1 - 1]) {
1066                         recursively_mark_NOTATTACHED(
1067                                         rhdev->children[port1 - 1]);
1068                         set_bit(port1, hub->change_bits);
1069                 }
1070         }
1071         spin_unlock_irqrestore(&device_state_lock, flags);
1072 }
1073 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1074
1075 #endif  /* CONFIG_PM */
1076
1077 static void choose_address(struct usb_device *udev)
1078 {
1079         int             devnum;
1080         struct usb_bus  *bus = udev->bus;
1081
1082         /* If khubd ever becomes multithreaded, this will need a lock */
1083
1084         /* Try to allocate the next devnum beginning at bus->devnum_next. */
1085         devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1086                         bus->devnum_next);
1087         if (devnum >= 128)
1088                 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1089
1090         bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1091
1092         if (devnum < 128) {
1093                 set_bit(devnum, bus->devmap.devicemap);
1094                 udev->devnum = devnum;
1095         }
1096 }
1097
1098 static void release_address(struct usb_device *udev)
1099 {
1100         if (udev->devnum > 0) {
1101                 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1102                 udev->devnum = -1;
1103         }
1104 }
1105
1106 /**
1107  * usb_disconnect - disconnect a device (usbcore-internal)
1108  * @pdev: pointer to device being disconnected
1109  * Context: !in_interrupt ()
1110  *
1111  * Something got disconnected. Get rid of it and all of its children.
1112  *
1113  * If *pdev is a normal device then the parent hub must already be locked.
1114  * If *pdev is a root hub then this routine will acquire the
1115  * usb_bus_list_lock on behalf of the caller.
1116  *
1117  * Only hub drivers (including virtual root hub drivers for host
1118  * controllers) should ever call this.
1119  *
1120  * This call is synchronous, and may not be used in an interrupt context.
1121  */
1122 void usb_disconnect(struct usb_device **pdev)
1123 {
1124         struct usb_device       *udev = *pdev;
1125         int                     i;
1126
1127         if (!udev) {
1128                 pr_debug ("%s nodev\n", __FUNCTION__);
1129                 return;
1130         }
1131
1132         /* mark the device as inactive, so any further urb submissions for
1133          * this device (and any of its children) will fail immediately.
1134          * this quiesces everyting except pending urbs.
1135          */
1136         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1137         dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1138
1139         usb_lock_device(udev);
1140
1141         /* Free up all the children before we remove this device */
1142         for (i = 0; i < USB_MAXCHILDREN; i++) {
1143                 if (udev->children[i])
1144                         usb_disconnect(&udev->children[i]);
1145         }
1146
1147         /* deallocate hcd/hardware state ... nuking all pending urbs and
1148          * cleaning up all state associated with the current configuration
1149          * so that the hardware is now fully quiesced.
1150          */
1151         dev_dbg (&udev->dev, "unregistering device\n");
1152         usb_disable_device(udev, 0);
1153
1154         usb_unlock_device(udev);
1155
1156         /* Unregister the device.  The device driver is responsible
1157          * for removing the device files from usbfs and sysfs and for
1158          * de-configuring the device.
1159          */
1160         device_del(&udev->dev);
1161
1162         /* Free the device number and delete the parent's children[]
1163          * (or root_hub) pointer.
1164          */
1165         release_address(udev);
1166
1167         /* Avoid races with recursively_mark_NOTATTACHED() */
1168         spin_lock_irq(&device_state_lock);
1169         *pdev = NULL;
1170         spin_unlock_irq(&device_state_lock);
1171
1172         put_device(&udev->dev);
1173 }
1174
1175 #ifdef DEBUG
1176 static void show_string(struct usb_device *udev, char *id, char *string)
1177 {
1178         if (!string)
1179                 return;
1180         dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1181 }
1182
1183 #else
1184 static inline void show_string(struct usb_device *udev, char *id, char *string)
1185 {}
1186 #endif
1187
1188
1189 #ifdef  CONFIG_USB_OTG
1190 #include "otg_whitelist.h"
1191 static int __usb_port_suspend(struct usb_device *, int port1);
1192 #endif
1193
1194 /**
1195  * usb_new_device - perform initial device setup (usbcore-internal)
1196  * @udev: newly addressed device (in ADDRESS state)
1197  *
1198  * This is called with devices which have been enumerated, but not yet
1199  * configured.  The device descriptor is available, but not descriptors
1200  * for any device configuration.  The caller must have locked either
1201  * the parent hub (if udev is a normal device) or else the
1202  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1203  * udev has already been installed, but udev is not yet visible through
1204  * sysfs or other filesystem code.
1205  *
1206  * Returns 0 for success (device is configured and listed, with its
1207  * interfaces, in sysfs); else a negative errno value.
1208  *
1209  * This call is synchronous, and may not be used in an interrupt context.
1210  *
1211  * Only the hub driver or root-hub registrar should ever call this.
1212  */
1213 int usb_new_device(struct usb_device *udev)
1214 {
1215         int err;
1216
1217         err = usb_get_configuration(udev);
1218         if (err < 0) {
1219                 dev_err(&udev->dev, "can't read configurations, error %d\n",
1220                         err);
1221                 goto fail;
1222         }
1223
1224         /* read the standard strings and cache them if present */
1225         udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1226         udev->manufacturer = usb_cache_string(udev,
1227                         udev->descriptor.iManufacturer);
1228         udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1229
1230         /* Tell the world! */
1231         dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1232                         "SerialNumber=%d\n",
1233                         udev->descriptor.iManufacturer,
1234                         udev->descriptor.iProduct,
1235                         udev->descriptor.iSerialNumber);
1236         show_string(udev, "Product", udev->product);
1237         show_string(udev, "Manufacturer", udev->manufacturer);
1238         show_string(udev, "SerialNumber", udev->serial);
1239
1240 #ifdef  CONFIG_USB_OTG
1241         /*
1242          * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1243          * to wake us after we've powered off VBUS; and HNP, switching roles
1244          * "host" to "peripheral".  The OTG descriptor helps figure this out.
1245          */
1246         if (!udev->bus->is_b_host
1247                         && udev->config
1248                         && udev->parent == udev->bus->root_hub) {
1249                 struct usb_otg_descriptor       *desc = 0;
1250                 struct usb_bus                  *bus = udev->bus;
1251
1252                 /* descriptor may appear anywhere in config */
1253                 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1254                                         le16_to_cpu(udev->config[0].desc.wTotalLength),
1255                                         USB_DT_OTG, (void **) &desc) == 0) {
1256                         if (desc->bmAttributes & USB_OTG_HNP) {
1257                                 unsigned                port1 = udev->portnum;
1258
1259                                 dev_info(&udev->dev,
1260                                         "Dual-Role OTG device on %sHNP port\n",
1261                                         (port1 == bus->otg_port)
1262                                                 ? "" : "non-");
1263
1264                                 /* enable HNP before suspend, it's simpler */
1265                                 if (port1 == bus->otg_port)
1266                                         bus->b_hnp_enable = 1;
1267                                 err = usb_control_msg(udev,
1268                                         usb_sndctrlpipe(udev, 0),
1269                                         USB_REQ_SET_FEATURE, 0,
1270                                         bus->b_hnp_enable
1271                                                 ? USB_DEVICE_B_HNP_ENABLE
1272                                                 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1273                                         0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1274                                 if (err < 0) {
1275                                         /* OTG MESSAGE: report errors here,
1276                                          * customize to match your product.
1277                                          */
1278                                         dev_info(&udev->dev,
1279                                                 "can't set HNP mode; %d\n",
1280                                                 err);
1281                                         bus->b_hnp_enable = 0;
1282                                 }
1283                         }
1284                 }
1285         }
1286
1287         if (!is_targeted(udev)) {
1288
1289                 /* Maybe it can talk to us, though we can't talk to it.
1290                  * (Includes HNP test device.)
1291                  */
1292                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1293                         err = __usb_port_suspend(udev, udev->bus->otg_port);
1294                         if (err < 0)
1295                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1296                 }
1297                 err = -ENODEV;
1298                 goto fail;
1299         }
1300 #endif
1301
1302         /* Register the device.  The device driver is responsible
1303          * for adding the device files to usbfs and sysfs and for
1304          * configuring the device.
1305          */
1306         err = device_add (&udev->dev);
1307         if (err) {
1308                 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1309                 goto fail;
1310         }
1311
1312         return 0;
1313
1314 fail:
1315         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1316         return err;
1317 }
1318
1319
1320 static int hub_port_status(struct usb_hub *hub, int port1,
1321                                u16 *status, u16 *change)
1322 {
1323         int ret;
1324
1325         ret = get_port_status(hub->hdev, port1, &hub->status->port);
1326         if (ret < 0)
1327                 dev_err (hub->intfdev,
1328                         "%s failed (err = %d)\n", __FUNCTION__, ret);
1329         else {
1330                 *status = le16_to_cpu(hub->status->port.wPortStatus);
1331                 *change = le16_to_cpu(hub->status->port.wPortChange); 
1332                 ret = 0;
1333         }
1334         return ret;
1335 }
1336
1337
1338 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1339 static unsigned hub_is_wusb(struct usb_hub *hub)
1340 {
1341         struct usb_hcd *hcd;
1342         if (hub->hdev->parent != NULL)  /* not a root hub? */
1343                 return 0;
1344         hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1345         return hcd->wireless;
1346 }
1347
1348
1349 #define PORT_RESET_TRIES        5
1350 #define SET_ADDRESS_TRIES       2
1351 #define GET_DESCRIPTOR_TRIES    2
1352 #define SET_CONFIG_TRIES        (2 * (use_both_schemes + 1))
1353 #define USE_NEW_SCHEME(i)       ((i) / 2 == old_scheme_first)
1354
1355 #define HUB_ROOT_RESET_TIME     50      /* times are in msec */
1356 #define HUB_SHORT_RESET_TIME    10
1357 #define HUB_LONG_RESET_TIME     200
1358 #define HUB_RESET_TIMEOUT       500
1359
1360 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1361                                 struct usb_device *udev, unsigned int delay)
1362 {
1363         int delay_time, ret;
1364         u16 portstatus;
1365         u16 portchange;
1366
1367         for (delay_time = 0;
1368                         delay_time < HUB_RESET_TIMEOUT;
1369                         delay_time += delay) {
1370                 /* wait to give the device a chance to reset */
1371                 msleep(delay);
1372
1373                 /* read and decode port status */
1374                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1375                 if (ret < 0)
1376                         return ret;
1377
1378                 /* Device went away? */
1379                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1380                         return -ENOTCONN;
1381
1382                 /* bomb out completely if something weird happened */
1383                 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1384                         return -EINVAL;
1385
1386                 /* if we`ve finished resetting, then break out of the loop */
1387                 if (!(portstatus & USB_PORT_STAT_RESET) &&
1388                     (portstatus & USB_PORT_STAT_ENABLE)) {
1389                         if (hub_is_wusb(hub))
1390                                 udev->speed = USB_SPEED_VARIABLE;
1391                         else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1392                                 udev->speed = USB_SPEED_HIGH;
1393                         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1394                                 udev->speed = USB_SPEED_LOW;
1395                         else
1396                                 udev->speed = USB_SPEED_FULL;
1397                         return 0;
1398                 }
1399
1400                 /* switch to the long delay after two short delay failures */
1401                 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1402                         delay = HUB_LONG_RESET_TIME;
1403
1404                 dev_dbg (hub->intfdev,
1405                         "port %d not reset yet, waiting %dms\n",
1406                         port1, delay);
1407         }
1408
1409         return -EBUSY;
1410 }
1411
1412 static int hub_port_reset(struct usb_hub *hub, int port1,
1413                                 struct usb_device *udev, unsigned int delay)
1414 {
1415         int i, status;
1416
1417         /* Reset the port */
1418         for (i = 0; i < PORT_RESET_TRIES; i++) {
1419                 status = set_port_feature(hub->hdev,
1420                                 port1, USB_PORT_FEAT_RESET);
1421                 if (status)
1422                         dev_err(hub->intfdev,
1423                                         "cannot reset port %d (err = %d)\n",
1424                                         port1, status);
1425                 else {
1426                         status = hub_port_wait_reset(hub, port1, udev, delay);
1427                         if (status && status != -ENOTCONN)
1428                                 dev_dbg(hub->intfdev,
1429                                                 "port_wait_reset: err = %d\n",
1430                                                 status);
1431                 }
1432
1433                 /* return on disconnect or reset */
1434                 switch (status) {
1435                 case 0:
1436                         /* TRSTRCY = 10 ms; plus some extra */
1437                         msleep(10 + 40);
1438                         /* FALL THROUGH */
1439                 case -ENOTCONN:
1440                 case -ENODEV:
1441                         clear_port_feature(hub->hdev,
1442                                 port1, USB_PORT_FEAT_C_RESET);
1443                         /* FIXME need disconnect() for NOTATTACHED device */
1444                         usb_set_device_state(udev, status
1445                                         ? USB_STATE_NOTATTACHED
1446                                         : USB_STATE_DEFAULT);
1447                         return status;
1448                 }
1449
1450                 dev_dbg (hub->intfdev,
1451                         "port %d not enabled, trying reset again...\n",
1452                         port1);
1453                 delay = HUB_LONG_RESET_TIME;
1454         }
1455
1456         dev_err (hub->intfdev,
1457                 "Cannot enable port %i.  Maybe the USB cable is bad?\n",
1458                 port1);
1459
1460         return status;
1461 }
1462
1463 /*
1464  * Disable a port and mark a logical connnect-change event, so that some
1465  * time later khubd will disconnect() any existing usb_device on the port
1466  * and will re-enumerate if there actually is a device attached.
1467  */
1468 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1469 {
1470         dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1471         hub_port_disable(hub, port1, 1);
1472
1473         /* FIXME let caller ask to power down the port:
1474          *  - some devices won't enumerate without a VBUS power cycle
1475          *  - SRP saves power that way
1476          *  - ... new call, TBD ...
1477          * That's easy if this hub can switch power per-port, and
1478          * khubd reactivates the port later (timer, SRP, etc).
1479          * Powerdown must be optional, because of reset/DFU.
1480          */
1481
1482         set_bit(port1, hub->change_bits);
1483         kick_khubd(hub);
1484 }
1485
1486 #ifdef  CONFIG_PM
1487
1488 #ifdef  CONFIG_USB_SUSPEND
1489
1490 /*
1491  * Selective port suspend reduces power; most suspended devices draw
1492  * less than 500 uA.  It's also used in OTG, along with remote wakeup.
1493  * All devices below the suspended port are also suspended.
1494  *
1495  * Devices leave suspend state when the host wakes them up.  Some devices
1496  * also support "remote wakeup", where the device can activate the USB
1497  * tree above them to deliver data, such as a keypress or packet.  In
1498  * some cases, this wakes the USB host.
1499  */
1500 static int hub_port_suspend(struct usb_hub *hub, int port1,
1501                 struct usb_device *udev)
1502 {
1503         int     status;
1504
1505         // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1506
1507         /* enable remote wakeup when appropriate; this lets the device
1508          * wake up the upstream hub (including maybe the root hub).
1509          *
1510          * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
1511          * we don't explicitly enable it here.
1512          */
1513         if (udev->do_remote_wakeup) {
1514                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1515                                 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1516                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1517                                 NULL, 0,
1518                                 USB_CTRL_SET_TIMEOUT);
1519                 if (status)
1520                         dev_dbg(&udev->dev,
1521                                 "won't remote wakeup, status %d\n",
1522                                 status);
1523         }
1524
1525         /* see 7.1.7.6 */
1526         status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1527         if (status) {
1528                 dev_dbg(hub->intfdev,
1529                         "can't suspend port %d, status %d\n",
1530                         port1, status);
1531                 /* paranoia:  "should not happen" */
1532                 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1533                                 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1534                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1535                                 NULL, 0,
1536                                 USB_CTRL_SET_TIMEOUT);
1537         } else {
1538                 /* device has up to 10 msec to fully suspend */
1539                 dev_dbg(&udev->dev, "usb %ssuspend\n",
1540                                 udev->auto_pm ? "auto-" : "");
1541                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1542                 msleep(10);
1543         }
1544         return status;
1545 }
1546
1547 /*
1548  * Devices on USB hub ports have only one "suspend" state, corresponding
1549  * to ACPI D2, "may cause the device to lose some context".
1550  * State transitions include:
1551  *
1552  *   - suspend, resume ... when the VBUS power link stays live
1553  *   - suspend, disconnect ... VBUS lost
1554  *
1555  * Once VBUS drop breaks the circuit, the port it's using has to go through
1556  * normal re-enumeration procedures, starting with enabling VBUS power.
1557  * Other than re-initializing the hub (plug/unplug, except for root hubs),
1558  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
1559  * timer, no SRP, no requests through sysfs.
1560  *
1561  * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1562  * the root hub for their bus goes into global suspend ... so we don't
1563  * (falsely) update the device power state to say it suspended.
1564  */
1565 static int __usb_port_suspend (struct usb_device *udev, int port1)
1566 {
1567         int     status = 0;
1568
1569         /* caller owns the udev device lock */
1570         if (port1 < 0)
1571                 return port1;
1572
1573         /* we change the device's upstream USB link,
1574          * but root hubs have no upstream USB link.
1575          */
1576         if (udev->parent)
1577                 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1578                                 udev);
1579         else {
1580                 dev_dbg(&udev->dev, "usb %ssuspend\n",
1581                                 udev->auto_pm ? "auto-" : "");
1582                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1583         }
1584         return status;
1585 }
1586
1587 /*
1588  * usb_port_suspend - suspend a usb device's upstream port
1589  * @udev: device that's no longer in active use
1590  * Context: must be able to sleep; device not locked; pm locks held
1591  *
1592  * Suspends a USB device that isn't in active use, conserving power.
1593  * Devices may wake out of a suspend, if anything important happens,
1594  * using the remote wakeup mechanism.  They may also be taken out of
1595  * suspend by the host, using usb_port_resume().  It's also routine
1596  * to disconnect devices while they are suspended.
1597  *
1598  * This only affects the USB hardware for a device; its interfaces
1599  * (and, for hubs, child devices) must already have been suspended.
1600  *
1601  * Suspending OTG devices may trigger HNP, if that's been enabled
1602  * between a pair of dual-role devices.  That will change roles, such
1603  * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1604  *
1605  * Returns 0 on success, else negative errno.
1606  */
1607 int usb_port_suspend(struct usb_device *udev)
1608 {
1609         return __usb_port_suspend(udev, udev->portnum);
1610 }
1611
1612 /*
1613  * If the USB "suspend" state is in use (rather than "global suspend"),
1614  * many devices will be individually taken out of suspend state using
1615  * special" resume" signaling.  These routines kick in shortly after
1616  * hardware resume signaling is finished, either because of selective
1617  * resume (by host) or remote wakeup (by device) ... now see what changed
1618  * in the tree that's rooted at this device.
1619  */
1620 static int finish_port_resume(struct usb_device *udev)
1621 {
1622         int     status;
1623         u16     devstatus;
1624
1625         /* caller owns the udev device lock */
1626         dev_dbg(&udev->dev, "finish resume\n");
1627
1628         /* usb ch9 identifies four variants of SUSPENDED, based on what
1629          * state the device resumes to.  Linux currently won't see the
1630          * first two on the host side; they'd be inside hub_port_init()
1631          * during many timeouts, but khubd can't suspend until later.
1632          */
1633         usb_set_device_state(udev, udev->actconfig
1634                         ? USB_STATE_CONFIGURED
1635                         : USB_STATE_ADDRESS);
1636
1637         /* 10.5.4.5 says be sure devices in the tree are still there.
1638          * For now let's assume the device didn't go crazy on resume,
1639          * and device drivers will know about any resume quirks.
1640          */
1641         status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1642         if (status >= 0)
1643                 status = (status == 2 ? 0 : -ENODEV);
1644
1645         if (status)
1646                 dev_dbg(&udev->dev,
1647                         "gone after usb resume? status %d\n",
1648                         status);
1649         else if (udev->actconfig) {
1650                 le16_to_cpus(&devstatus);
1651                 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1652                                 && udev->parent) {
1653                         status = usb_control_msg(udev,
1654                                         usb_sndctrlpipe(udev, 0),
1655                                         USB_REQ_CLEAR_FEATURE,
1656                                                 USB_RECIP_DEVICE,
1657                                         USB_DEVICE_REMOTE_WAKEUP, 0,
1658                                         NULL, 0,
1659                                         USB_CTRL_SET_TIMEOUT);
1660                         if (status)
1661                                 dev_dbg(&udev->dev, "disable remote "
1662                                         "wakeup, status %d\n", status);
1663                 }
1664                 status = 0;
1665
1666         } else if (udev->devnum <= 0) {
1667                 dev_dbg(&udev->dev, "bogus resume!\n");
1668                 status = -EINVAL;
1669         }
1670         return status;
1671 }
1672
1673 static int
1674 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1675 {
1676         int     status;
1677
1678         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1679
1680         set_bit(port1, hub->busy_bits);
1681
1682         /* see 7.1.7.7; affects power usage, but not budgeting */
1683         status = clear_port_feature(hub->hdev,
1684                         port1, USB_PORT_FEAT_SUSPEND);
1685         if (status) {
1686                 dev_dbg(hub->intfdev,
1687                         "can't resume port %d, status %d\n",
1688                         port1, status);
1689         } else {
1690                 u16             devstatus;
1691                 u16             portchange;
1692
1693                 /* drive resume for at least 20 msec */
1694                 if (udev)
1695                         dev_dbg(&udev->dev, "usb %sresume\n",
1696                                         udev->auto_pm ? "auto-" : "");
1697                 msleep(25);
1698
1699 #define LIVE_FLAGS      ( USB_PORT_STAT_POWER \
1700                         | USB_PORT_STAT_ENABLE \
1701                         | USB_PORT_STAT_CONNECTION)
1702
1703                 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1704                  * stop resume signaling.  Then finish the resume
1705                  * sequence.
1706                  */
1707                 devstatus = portchange = 0;
1708                 status = hub_port_status(hub, port1,
1709                                 &devstatus, &portchange);
1710                 if (status < 0
1711                                 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1712                                 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1713                                 ) {
1714                         dev_dbg(hub->intfdev,
1715                                 "port %d status %04x.%04x after resume, %d\n",
1716                                 port1, portchange, devstatus, status);
1717                         if (status >= 0)
1718                                 status = -ENODEV;
1719                 } else {
1720                         if (portchange & USB_PORT_STAT_C_SUSPEND)
1721                                 clear_port_feature(hub->hdev, port1,
1722                                                 USB_PORT_FEAT_C_SUSPEND);
1723                         /* TRSMRCY = 10 msec */
1724                         msleep(10);
1725                         if (udev)
1726                                 status = finish_port_resume(udev);
1727                 }
1728         }
1729         if (status < 0)
1730                 hub_port_logical_disconnect(hub, port1);
1731
1732         clear_bit(port1, hub->busy_bits);
1733         if (!hub->hdev->parent && !hub->busy_bits[0])
1734                 usb_enable_root_hub_irq(hub->hdev->bus);
1735
1736         return status;
1737 }
1738
1739 /*
1740  * usb_port_resume - re-activate a suspended usb device's upstream port
1741  * @udev: device to re-activate
1742  * Context: must be able to sleep; device not locked; pm locks held
1743  *
1744  * This will re-activate the suspended device, increasing power usage
1745  * while letting drivers communicate again with its endpoints.
1746  * USB resume explicitly guarantees that the power session between
1747  * the host and the device is the same as it was when the device
1748  * suspended.
1749  *
1750  * Returns 0 on success, else negative errno.
1751  */
1752 int usb_port_resume(struct usb_device *udev)
1753 {
1754         int     status;
1755
1756         /* we change the device's upstream USB link,
1757          * but root hubs have no upstream USB link.
1758          */
1759         if (udev->parent) {
1760                 // NOTE this fails if parent is also suspended...
1761                 status = hub_port_resume(hdev_to_hub(udev->parent),
1762                                 udev->portnum, udev);
1763         } else {
1764                 dev_dbg(&udev->dev, "usb %sresume\n",
1765                                 udev->auto_pm ? "auto-" : "");
1766                 status = finish_port_resume(udev);
1767         }
1768         if (status < 0)
1769                 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1770         return status;
1771 }
1772
1773 static int remote_wakeup(struct usb_device *udev)
1774 {
1775         int     status = 0;
1776
1777         /* All this just to avoid sending a port-resume message
1778          * to the parent hub! */
1779
1780         usb_lock_device(udev);
1781         usb_pm_lock(udev);
1782         if (udev->state == USB_STATE_SUSPENDED) {
1783                 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1784                 /* TRSMRCY = 10 msec */
1785                 msleep(10);
1786                 status = finish_port_resume(udev);
1787                 if (status == 0)
1788                         udev->dev.power.power_state.event = PM_EVENT_ON;
1789         }
1790         usb_pm_unlock(udev);
1791
1792         if (status == 0)
1793                 usb_autoresume_device(udev, 0);
1794         usb_unlock_device(udev);
1795         return status;
1796 }
1797
1798 #else   /* CONFIG_USB_SUSPEND */
1799
1800 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1801
1802 int usb_port_suspend(struct usb_device *udev)
1803 {
1804         return 0;
1805 }
1806
1807 static inline int
1808 finish_port_resume(struct usb_device *udev)
1809 {
1810         return 0;
1811 }
1812
1813 static inline int
1814 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1815 {
1816         return 0;
1817 }
1818
1819 int usb_port_resume(struct usb_device *udev)
1820 {
1821         return 0;
1822 }
1823
1824 static inline int remote_wakeup(struct usb_device *udev)
1825 {
1826         return 0;
1827 }
1828
1829 #endif
1830
1831 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1832 {
1833         struct usb_hub          *hub = usb_get_intfdata (intf);
1834         struct usb_device       *hdev = hub->hdev;
1835         unsigned                port1;
1836
1837         /* fail if children aren't already suspended */
1838         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1839                 struct usb_device       *udev;
1840
1841                 udev = hdev->children [port1-1];
1842                 if (udev && msg.event == PM_EVENT_SUSPEND &&
1843 #ifdef  CONFIG_USB_SUSPEND
1844                                 udev->state != USB_STATE_SUSPENDED
1845 #else
1846                                 udev->dev.power.power_state.event
1847                                         == PM_EVENT_ON
1848 #endif
1849                                 ) {
1850                         if (!hdev->auto_pm)
1851                                 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1852                                                 port1);
1853                         return -EBUSY;
1854                 }
1855         }
1856
1857         /* "global suspend" of the downstream HC-to-USB interface */
1858         if (!hdev->parent) {
1859                 struct usb_bus  *bus = hdev->bus;
1860                 if (bus) {
1861                         int     status = hcd_bus_suspend (bus);
1862
1863                         if (status != 0) {
1864                                 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1865                                         status);
1866                                 return status;
1867                         }
1868                 } else
1869                         return -EOPNOTSUPP;
1870         }
1871
1872         /* stop khubd and related activity */
1873         hub_quiesce(hub);
1874         return 0;
1875 }
1876
1877 static int hub_resume(struct usb_interface *intf)
1878 {
1879         struct usb_device       *hdev = interface_to_usbdev(intf);
1880         struct usb_hub          *hub = usb_get_intfdata (intf);
1881         int                     status;
1882
1883         /* "global resume" of the downstream HC-to-USB interface */
1884         if (!hdev->parent) {
1885                 struct usb_bus  *bus = hdev->bus;
1886                 if (bus) {
1887                         status = hcd_bus_resume (bus);
1888                         if (status) {
1889                                 dev_dbg(&intf->dev, "'global' resume %d\n",
1890                                         status);
1891                                 return status;
1892                         }
1893                 } else
1894                         return -EOPNOTSUPP;
1895                 if (status == 0) {
1896                         /* TRSMRCY = 10 msec */
1897                         msleep(10);
1898                 }
1899         }
1900
1901         /* tell khubd to look for changes on this hub */
1902         hub_activate(hub);
1903         return 0;
1904 }
1905
1906 #else   /* CONFIG_PM */
1907
1908 static inline int remote_wakeup(struct usb_device *udev)
1909 {
1910         return 0;
1911 }
1912
1913 #define hub_suspend NULL
1914 #define hub_resume NULL
1915 #endif
1916
1917 void usb_resume_root_hub(struct usb_device *hdev)
1918 {
1919         struct usb_hub *hub = hdev_to_hub(hdev);
1920
1921         hub->resume_root_hub = 1;
1922         kick_khubd(hub);
1923 }
1924
1925
1926 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1927  *
1928  * Between connect detection and reset signaling there must be a delay
1929  * of 100ms at least for debounce and power-settling.  The corresponding
1930  * timer shall restart whenever the downstream port detects a disconnect.
1931  * 
1932  * Apparently there are some bluetooth and irda-dongles and a number of
1933  * low-speed devices for which this debounce period may last over a second.
1934  * Not covered by the spec - but easy to deal with.
1935  *
1936  * This implementation uses a 1500ms total debounce timeout; if the
1937  * connection isn't stable by then it returns -ETIMEDOUT.  It checks
1938  * every 25ms for transient disconnects.  When the port status has been
1939  * unchanged for 100ms it returns the port status.
1940  */
1941
1942 #define HUB_DEBOUNCE_TIMEOUT    1500
1943 #define HUB_DEBOUNCE_STEP         25
1944 #define HUB_DEBOUNCE_STABLE      100
1945
1946 static int hub_port_debounce(struct usb_hub *hub, int port1)
1947 {
1948         int ret;
1949         int total_time, stable_time = 0;
1950         u16 portchange, portstatus;
1951         unsigned connection = 0xffff;
1952
1953         for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
1954                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1955                 if (ret < 0)
1956                         return ret;
1957
1958                 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
1959                      (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
1960                         stable_time += HUB_DEBOUNCE_STEP;
1961                         if (stable_time >= HUB_DEBOUNCE_STABLE)
1962                                 break;
1963                 } else {
1964                         stable_time = 0;
1965                         connection = portstatus & USB_PORT_STAT_CONNECTION;
1966                 }
1967
1968                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1969                         clear_port_feature(hub->hdev, port1,
1970                                         USB_PORT_FEAT_C_CONNECTION);
1971                 }
1972
1973                 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
1974                         break;
1975                 msleep(HUB_DEBOUNCE_STEP);
1976         }
1977
1978         dev_dbg (hub->intfdev,
1979                 "debounce: port %d: total %dms stable %dms status 0x%x\n",
1980                 port1, total_time, stable_time, portstatus);
1981
1982         if (stable_time < HUB_DEBOUNCE_STABLE)
1983                 return -ETIMEDOUT;
1984         return portstatus;
1985 }
1986
1987 static void ep0_reinit(struct usb_device *udev)
1988 {
1989         usb_disable_endpoint(udev, 0 + USB_DIR_IN);
1990         usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
1991         udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
1992 }
1993
1994 #define usb_sndaddr0pipe()      (PIPE_CONTROL << 30)
1995 #define usb_rcvaddr0pipe()      ((PIPE_CONTROL << 30) | USB_DIR_IN)
1996
1997 static int hub_set_address(struct usb_device *udev)
1998 {
1999         int retval;
2000
2001         if (udev->devnum == 0)
2002                 return -EINVAL;
2003         if (udev->state == USB_STATE_ADDRESS)
2004                 return 0;
2005         if (udev->state != USB_STATE_DEFAULT)
2006                 return -EINVAL;
2007         retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2008                 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2009                 NULL, 0, USB_CTRL_SET_TIMEOUT);
2010         if (retval == 0) {
2011                 usb_set_device_state(udev, USB_STATE_ADDRESS);
2012                 ep0_reinit(udev);
2013         }
2014         return retval;
2015 }
2016
2017 /* Reset device, (re)assign address, get device descriptor.
2018  * Device connection must be stable, no more debouncing needed.
2019  * Returns device in USB_STATE_ADDRESS, except on error.
2020  *
2021  * If this is called for an already-existing device (as part of
2022  * usb_reset_device), the caller must own the device lock.  For a
2023  * newly detected device that is not accessible through any global
2024  * pointers, it's not necessary to lock the device.
2025  */
2026 static int
2027 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2028                 int retry_counter)
2029 {
2030         static DEFINE_MUTEX(usb_address0_mutex);
2031
2032         struct usb_device       *hdev = hub->hdev;
2033         int                     i, j, retval;
2034         unsigned                delay = HUB_SHORT_RESET_TIME;
2035         enum usb_device_speed   oldspeed = udev->speed;
2036         char                    *speed, *type;
2037
2038         /* root hub ports have a slightly longer reset period
2039          * (from USB 2.0 spec, section 7.1.7.5)
2040          */
2041         if (!hdev->parent) {
2042                 delay = HUB_ROOT_RESET_TIME;
2043                 if (port1 == hdev->bus->otg_port)
2044                         hdev->bus->b_hnp_enable = 0;
2045         }
2046
2047         /* Some low speed devices have problems with the quick delay, so */
2048         /*  be a bit pessimistic with those devices. RHbug #23670 */
2049         if (oldspeed == USB_SPEED_LOW)
2050                 delay = HUB_LONG_RESET_TIME;
2051
2052         mutex_lock(&usb_address0_mutex);
2053
2054         /* Reset the device; full speed may morph to high speed */
2055         retval = hub_port_reset(hub, port1, udev, delay);
2056         if (retval < 0)         /* error or disconnect */
2057                 goto fail;
2058                                 /* success, speed is known */
2059         retval = -ENODEV;
2060
2061         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2062                 dev_dbg(&udev->dev, "device reset changed speed!\n");
2063                 goto fail;
2064         }
2065         oldspeed = udev->speed;
2066   
2067         /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2068          * it's fixed size except for full speed devices.
2069          * For Wireless USB devices, ep0 max packet is always 512 (tho
2070          * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2071          */
2072         switch (udev->speed) {
2073         case USB_SPEED_VARIABLE:        /* fixed at 512 */
2074                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2075                 break;
2076         case USB_SPEED_HIGH:            /* fixed at 64 */
2077                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2078                 break;
2079         case USB_SPEED_FULL:            /* 8, 16, 32, or 64 */
2080                 /* to determine the ep0 maxpacket size, try to read
2081                  * the device descriptor to get bMaxPacketSize0 and
2082                  * then correct our initial guess.
2083                  */
2084                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2085                 break;
2086         case USB_SPEED_LOW:             /* fixed at 8 */
2087                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2088                 break;
2089         default:
2090                 goto fail;
2091         }
2092  
2093         type = "";
2094         switch (udev->speed) {
2095         case USB_SPEED_LOW:     speed = "low";  break;
2096         case USB_SPEED_FULL:    speed = "full"; break;
2097         case USB_SPEED_HIGH:    speed = "high"; break;
2098         case USB_SPEED_VARIABLE:
2099                                 speed = "variable";
2100                                 type = "Wireless ";
2101                                 break;
2102         default:                speed = "?";    break;
2103         }
2104         dev_info (&udev->dev,
2105                   "%s %s speed %sUSB device using %s and address %d\n",
2106                   (udev->config) ? "reset" : "new", speed, type,
2107                   udev->bus->controller->driver->name, udev->devnum);
2108
2109         /* Set up TT records, if needed  */
2110         if (hdev->tt) {
2111                 udev->tt = hdev->tt;
2112                 udev->ttport = hdev->ttport;
2113         } else if (udev->speed != USB_SPEED_HIGH
2114                         && hdev->speed == USB_SPEED_HIGH) {
2115                 udev->tt = &hub->tt;
2116                 udev->ttport = port1;
2117         }
2118  
2119         /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2120          * Because device hardware and firmware is sometimes buggy in
2121          * this area, and this is how Linux has done it for ages.
2122          * Change it cautiously.
2123          *
2124          * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2125          * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2126          * so it may help with some non-standards-compliant devices.
2127          * Otherwise we start with SET_ADDRESS and then try to read the
2128          * first 8 bytes of the device descriptor to get the ep0 maxpacket
2129          * value.
2130          */
2131         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2132                 if (USE_NEW_SCHEME(retry_counter)) {
2133                         struct usb_device_descriptor *buf;
2134                         int r = 0;
2135
2136 #define GET_DESCRIPTOR_BUFSIZE  64
2137                         buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2138                         if (!buf) {
2139                                 retval = -ENOMEM;
2140                                 continue;
2141                         }
2142
2143                         /* Use a short timeout the first time through,
2144                          * so that recalcitrant full-speed devices with
2145                          * 8- or 16-byte ep0-maxpackets won't slow things
2146                          * down tremendously by NAKing the unexpectedly
2147                          * early status stage.  Also, retry on all errors;
2148                          * some devices are flakey.
2149                          * 255 is for WUSB devices, we actually need to use 512.
2150                          * WUSB1.0[4.8.1].
2151                          */
2152                         for (j = 0; j < 3; ++j) {
2153                                 buf->bMaxPacketSize0 = 0;
2154                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2155                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2156                                         USB_DT_DEVICE << 8, 0,
2157                                         buf, GET_DESCRIPTOR_BUFSIZE,
2158                                         (i ? USB_CTRL_GET_TIMEOUT : 1000));
2159                                 switch (buf->bMaxPacketSize0) {
2160                                 case 8: case 16: case 32: case 64: case 255:
2161                                         if (buf->bDescriptorType ==
2162                                                         USB_DT_DEVICE) {
2163                                                 r = 0;
2164                                                 break;
2165                                         }
2166                                         /* FALL THROUGH */
2167                                 default:
2168                                         if (r == 0)
2169                                                 r = -EPROTO;
2170                                         break;
2171                                 }
2172                                 if (r == 0)
2173                                         break;
2174                         }
2175                         udev->descriptor.bMaxPacketSize0 =
2176                                         buf->bMaxPacketSize0;
2177                         kfree(buf);
2178
2179                         retval = hub_port_reset(hub, port1, udev, delay);
2180                         if (retval < 0)         /* error or disconnect */
2181                                 goto fail;
2182                         if (oldspeed != udev->speed) {
2183                                 dev_dbg(&udev->dev,
2184                                         "device reset changed speed!\n");
2185                                 retval = -ENODEV;
2186                                 goto fail;
2187                         }
2188                         if (r) {
2189                                 dev_err(&udev->dev, "device descriptor "
2190                                                 "read/%s, error %d\n",
2191                                                 "64", r);
2192                                 retval = -EMSGSIZE;
2193                                 continue;
2194                         }
2195 #undef GET_DESCRIPTOR_BUFSIZE
2196                 }
2197
2198                 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2199                         retval = hub_set_address(udev);
2200                         if (retval >= 0)
2201                                 break;
2202                         msleep(200);
2203                 }
2204                 if (retval < 0) {
2205                         dev_err(&udev->dev,
2206                                 "device not accepting address %d, error %d\n",
2207                                 udev->devnum, retval);
2208                         goto fail;
2209                 }
2210  
2211                 /* cope with hardware quirkiness:
2212                  *  - let SET_ADDRESS settle, some device hardware wants it
2213                  *  - read ep0 maxpacket even for high and low speed,
2214                  */
2215                 msleep(10);
2216                 if (USE_NEW_SCHEME(retry_counter))
2217                         break;
2218
2219                 retval = usb_get_device_descriptor(udev, 8);
2220                 if (retval < 8) {
2221                         dev_err(&udev->dev, "device descriptor "
2222                                         "read/%s, error %d\n",
2223                                         "8", retval);
2224                         if (retval >= 0)
2225                                 retval = -EMSGSIZE;
2226                 } else {
2227                         retval = 0;
2228                         break;
2229                 }
2230         }
2231         if (retval)
2232                 goto fail;
2233
2234         i = udev->descriptor.bMaxPacketSize0 == 0xff?
2235             512 : udev->descriptor.bMaxPacketSize0;
2236         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2237                 if (udev->speed != USB_SPEED_FULL ||
2238                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2239                         dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2240                         retval = -EMSGSIZE;
2241                         goto fail;
2242                 }
2243                 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2244                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2245                 ep0_reinit(udev);
2246         }
2247   
2248         retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2249         if (retval < (signed)sizeof(udev->descriptor)) {
2250                 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2251                         "all", retval);
2252                 if (retval >= 0)
2253                         retval = -ENOMSG;
2254                 goto fail;
2255         }
2256
2257         retval = 0;
2258
2259 fail:
2260         if (retval)
2261                 hub_port_disable(hub, port1, 0);
2262         mutex_unlock(&usb_address0_mutex);
2263         return retval;
2264 }
2265
2266 static void
2267 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2268 {
2269         struct usb_qualifier_descriptor *qual;
2270         int                             status;
2271
2272         qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2273         if (qual == NULL)
2274                 return;
2275
2276         status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2277                         qual, sizeof *qual);
2278         if (status == sizeof *qual) {
2279                 dev_info(&udev->dev, "not running at top speed; "
2280                         "connect to a high speed hub\n");
2281                 /* hub LEDs are probably harder to miss than syslog */
2282                 if (hub->has_indicators) {
2283                         hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2284                         schedule_work (&hub->leds);
2285                 }
2286         }
2287         kfree(qual);
2288 }
2289
2290 static unsigned
2291 hub_power_remaining (struct usb_hub *hub)
2292 {
2293         struct usb_device *hdev = hub->hdev;
2294         int remaining;
2295         int port1;
2296
2297         if (!hub->limited_power)
2298                 return 0;
2299
2300         remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2301         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2302                 struct usb_device       *udev = hdev->children[port1 - 1];
2303                 int                     delta;
2304
2305                 if (!udev)
2306                         continue;
2307
2308                 /* Unconfigured devices may not use more than 100mA,
2309                  * or 8mA for OTG ports */
2310                 if (udev->actconfig)
2311                         delta = udev->actconfig->desc.bMaxPower * 2;
2312                 else if (port1 != udev->bus->otg_port || hdev->parent)
2313                         delta = 100;
2314                 else
2315                         delta = 8;
2316                 if (delta > hub->mA_per_port)
2317                         dev_warn(&udev->dev, "%dmA is over %umA budget "
2318                                         "for port %d!\n",
2319                                         delta, hub->mA_per_port, port1);
2320                 remaining -= delta;
2321         }
2322         if (remaining < 0) {
2323                 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2324                         - remaining);
2325                 remaining = 0;
2326         }
2327         return remaining;
2328 }
2329
2330 /* Handle physical or logical connection change events.
2331  * This routine is called when:
2332  *      a port connection-change occurs;
2333  *      a port enable-change occurs (often caused by EMI);
2334  *      usb_reset_device() encounters changed descriptors (as from
2335  *              a firmware download)
2336  * caller already locked the hub
2337  */
2338 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2339                                         u16 portstatus, u16 portchange)
2340 {
2341         struct usb_device *hdev = hub->hdev;
2342         struct device *hub_dev = hub->intfdev;
2343         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2344         int status, i;
2345  
2346         dev_dbg (hub_dev,
2347                 "port %d, status %04x, change %04x, %s\n",
2348                 port1, portstatus, portchange, portspeed (portstatus));
2349
2350         if (hub->has_indicators) {
2351                 set_port_led(hub, port1, HUB_LED_AUTO);
2352                 hub->indicator[port1-1] = INDICATOR_AUTO;
2353         }
2354  
2355         /* Disconnect any existing devices under this port */
2356         if (hdev->children[port1-1])
2357                 usb_disconnect(&hdev->children[port1-1]);
2358         clear_bit(port1, hub->change_bits);
2359
2360 #ifdef  CONFIG_USB_OTG
2361         /* during HNP, don't repeat the debounce */
2362         if (hdev->bus->is_b_host)
2363                 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2364 #endif
2365
2366         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2367                 status = hub_port_debounce(hub, port1);
2368                 if (status < 0) {
2369                         dev_err (hub_dev,
2370                                 "connect-debounce failed, port %d disabled\n",
2371                                 port1);
2372                         goto done;
2373                 }
2374                 portstatus = status;
2375         }
2376
2377         /* Return now if nothing is connected */
2378         if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2379
2380                 /* maybe switch power back on (e.g. root hub was reset) */
2381                 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2382                                 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2383                         set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2384  
2385                 if (portstatus & USB_PORT_STAT_ENABLE)
2386                         goto done;
2387                 return;
2388         }
2389
2390 #ifdef  CONFIG_USB_SUSPEND
2391         /* If something is connected, but the port is suspended, wake it up. */
2392         if (portstatus & USB_PORT_STAT_SUSPEND) {
2393                 status = hub_port_resume(hub, port1, NULL);
2394                 if (status < 0) {
2395                         dev_dbg(hub_dev,
2396                                 "can't clear suspend on port %d; %d\n",
2397                                 port1, status);
2398                         goto done;
2399                 }
2400         }
2401 #endif
2402
2403         for (i = 0; i < SET_CONFIG_TRIES; i++) {
2404                 struct usb_device *udev;
2405
2406                 /* reallocate for each attempt, since references
2407                  * to the previous one can escape in various ways
2408                  */
2409                 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2410                 if (!udev) {
2411                         dev_err (hub_dev,
2412                                 "couldn't allocate port %d usb_device\n",
2413                                 port1);
2414                         goto done;
2415                 }
2416
2417                 usb_set_device_state(udev, USB_STATE_POWERED);
2418                 udev->speed = USB_SPEED_UNKNOWN;
2419                 udev->bus_mA = hub->mA_per_port;
2420                 udev->level = hdev->level + 1;
2421
2422                 /* set the address */
2423                 choose_address(udev);
2424                 if (udev->devnum <= 0) {
2425                         status = -ENOTCONN;     /* Don't retry */
2426                         goto loop;
2427                 }
2428
2429                 /* reset and get descriptor */
2430                 status = hub_port_init(hub, udev, port1, i);
2431                 if (status < 0)
2432                         goto loop;
2433
2434                 /* consecutive bus-powered hubs aren't reliable; they can
2435                  * violate the voltage drop budget.  if the new child has
2436                  * a "powered" LED, users should notice we didn't enable it
2437                  * (without reading syslog), even without per-port LEDs
2438                  * on the parent.
2439                  */
2440                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2441                                 && udev->bus_mA <= 100) {
2442                         u16     devstat;
2443
2444                         status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2445                                         &devstat);
2446                         if (status < 2) {
2447                                 dev_dbg(&udev->dev, "get status %d ?\n", status);
2448                                 goto loop_disable;
2449                         }
2450                         le16_to_cpus(&devstat);
2451                         if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2452                                 dev_err(&udev->dev,
2453                                         "can't connect bus-powered hub "
2454                                         "to this port\n");
2455                                 if (hub->has_indicators) {
2456                                         hub->indicator[port1-1] =
2457                                                 INDICATOR_AMBER_BLINK;
2458                                         schedule_work (&hub->leds);
2459                                 }
2460                                 status = -ENOTCONN;     /* Don't retry */
2461                                 goto loop_disable;
2462                         }
2463                 }
2464  
2465                 /* check for devices running slower than they could */
2466                 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2467                                 && udev->speed == USB_SPEED_FULL
2468                                 && highspeed_hubs != 0)
2469                         check_highspeed (hub, udev, port1);
2470
2471                 /* Store the parent's children[] pointer.  At this point
2472                  * udev becomes globally accessible, although presumably
2473                  * no one will look at it until hdev is unlocked.
2474                  */
2475                 status = 0;
2476
2477                 /* We mustn't add new devices if the parent hub has
2478                  * been disconnected; we would race with the
2479                  * recursively_mark_NOTATTACHED() routine.
2480                  */
2481                 spin_lock_irq(&device_state_lock);
2482                 if (hdev->state == USB_STATE_NOTATTACHED)
2483                         status = -ENOTCONN;
2484                 else
2485                         hdev->children[port1-1] = udev;
2486                 spin_unlock_irq(&device_state_lock);
2487
2488                 /* Run it through the hoops (find a driver, etc) */
2489                 if (!status) {
2490                         status = usb_new_device(udev);
2491                         if (status) {
2492                                 spin_lock_irq(&device_state_lock);
2493                                 hdev->children[port1-1] = NULL;
2494                                 spin_unlock_irq(&device_state_lock);
2495                         }
2496                 }
2497
2498                 if (status)
2499                         goto loop_disable;
2500
2501                 status = hub_power_remaining(hub);
2502                 if (status)
2503                         dev_dbg(hub_dev, "%dmA power budget left\n", status);
2504
2505                 return;
2506
2507 loop_disable:
2508                 hub_port_disable(hub, port1, 1);
2509 loop:
2510                 ep0_reinit(udev);
2511                 release_address(udev);
2512                 usb_put_dev(udev);
2513                 if (status == -ENOTCONN)
2514                         break;
2515         }
2516  
2517 done:
2518         hub_port_disable(hub, port1, 1);
2519 }
2520
2521 static void hub_events(void)
2522 {
2523         struct list_head *tmp;
2524         struct usb_device *hdev;
2525         struct usb_interface *intf;
2526         struct usb_hub *hub;
2527         struct device *hub_dev;
2528         u16 hubstatus;
2529         u16 hubchange;
2530         u16 portstatus;
2531         u16 portchange;
2532         int i, ret;
2533         int connect_change;
2534
2535         /*
2536          *  We restart the list every time to avoid a deadlock with
2537          * deleting hubs downstream from this one. This should be
2538          * safe since we delete the hub from the event list.
2539          * Not the most efficient, but avoids deadlocks.
2540          */
2541         while (1) {
2542
2543                 /* Grab the first entry at the beginning of the list */
2544                 spin_lock_irq(&hub_event_lock);
2545                 if (list_empty(&hub_event_list)) {
2546                         spin_unlock_irq(&hub_event_lock);
2547                         break;
2548                 }
2549
2550                 tmp = hub_event_list.next;
2551                 list_del_init(tmp);
2552
2553                 hub = list_entry(tmp, struct usb_hub, event_list);
2554                 hdev = hub->hdev;
2555                 intf = to_usb_interface(hub->intfdev);
2556                 hub_dev = &intf->dev;
2557
2558                 i = hub->resume_root_hub;
2559
2560                 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2561                                 hdev->state, hub->descriptor
2562                                         ? hub->descriptor->bNbrPorts
2563                                         : 0,
2564                                 /* NOTE: expects max 15 ports... */
2565                                 (u16) hub->change_bits[0],
2566                                 (u16) hub->event_bits[0],
2567                                 i ? ", resume root" : "");
2568
2569                 usb_get_intf(intf);
2570                 spin_unlock_irq(&hub_event_lock);
2571
2572                 /* Lock the device, then check to see if we were
2573                  * disconnected while waiting for the lock to succeed. */
2574                 if (locktree(hdev) < 0) {
2575                         usb_put_intf(intf);
2576                         continue;
2577                 }
2578                 if (hub != usb_get_intfdata(intf))
2579                         goto loop;
2580
2581                 /* If the hub has died, clean up after it */
2582                 if (hdev->state == USB_STATE_NOTATTACHED) {
2583                         hub->error = -ENODEV;
2584                         hub_pre_reset(intf);
2585                         goto loop;
2586                 }
2587
2588                 /* Is this is a root hub wanting to reactivate the downstream
2589                  * ports?  If so, be sure the interface resumes even if its
2590                  * stub "device" node was never suspended.
2591                  */
2592                 if (i)
2593                         usb_autoresume_device(hdev, 0);
2594
2595                 /* If this is an inactive or suspended hub, do nothing */
2596                 if (hub->quiescing)
2597                         goto loop;
2598
2599                 if (hub->error) {
2600                         dev_dbg (hub_dev, "resetting for error %d\n",
2601                                 hub->error);
2602
2603                         ret = usb_reset_composite_device(hdev, intf);
2604                         if (ret) {
2605                                 dev_dbg (hub_dev,
2606                                         "error resetting hub: %d\n", ret);
2607                                 goto loop;
2608                         }
2609
2610                         hub->nerrors = 0;
2611                         hub->error = 0;
2612                 }
2613
2614                 /* deal with port status changes */
2615                 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2616                         if (test_bit(i, hub->busy_bits))
2617                                 continue;
2618                         connect_change = test_bit(i, hub->change_bits);
2619                         if (!test_and_clear_bit(i, hub->event_bits) &&
2620                                         !connect_change && !hub->activating)
2621                                 continue;
2622
2623                         ret = hub_port_status(hub, i,
2624                                         &portstatus, &portchange);
2625                         if (ret < 0)
2626                                 continue;
2627
2628                         if (hub->activating && !hdev->children[i-1] &&
2629                                         (portstatus &
2630                                                 USB_PORT_STAT_CONNECTION))
2631                                 connect_change = 1;
2632
2633                         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2634                                 clear_port_feature(hdev, i,
2635                                         USB_PORT_FEAT_C_CONNECTION);
2636                                 connect_change = 1;
2637                         }
2638
2639                         if (portchange & USB_PORT_STAT_C_ENABLE) {
2640                                 if (!connect_change)
2641                                         dev_dbg (hub_dev,
2642                                                 "port %d enable change, "
2643                                                 "status %08x\n",
2644                                                 i, portstatus);
2645                                 clear_port_feature(hdev, i,
2646                                         USB_PORT_FEAT_C_ENABLE);
2647
2648                                 /*
2649                                  * EM interference sometimes causes badly
2650                                  * shielded USB devices to be shutdown by
2651                                  * the hub, this hack enables them again.
2652                                  * Works at least with mouse driver. 
2653                                  */
2654                                 if (!(portstatus & USB_PORT_STAT_ENABLE)
2655                                     && !connect_change
2656                                     && hdev->children[i-1]) {
2657                                         dev_err (hub_dev,
2658                                             "port %i "
2659                                             "disabled by hub (EMI?), "
2660                                             "re-enabling...\n",
2661                                                 i);
2662                                         connect_change = 1;
2663                                 }
2664                         }
2665
2666                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2667                                 clear_port_feature(hdev, i,
2668                                         USB_PORT_FEAT_C_SUSPEND);
2669                                 if (hdev->children[i-1]) {
2670                                         ret = remote_wakeup(hdev->
2671                                                         children[i-1]);
2672                                         if (ret < 0)
2673                                                 connect_change = 1;
2674                                 } else {
2675                                         ret = -ENODEV;
2676                                         hub_port_disable(hub, i, 1);
2677                                 }
2678                                 dev_dbg (hub_dev,
2679                                         "resume on port %d, status %d\n",
2680                                         i, ret);
2681                         }
2682                         
2683                         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2684                                 dev_err (hub_dev,
2685                                         "over-current change on port %d\n",
2686                                         i);
2687                                 clear_port_feature(hdev, i,
2688                                         USB_PORT_FEAT_C_OVER_CURRENT);
2689                                 hub_power_on(hub);
2690                         }
2691
2692                         if (portchange & USB_PORT_STAT_C_RESET) {
2693                                 dev_dbg (hub_dev,
2694                                         "reset change on port %d\n",
2695                                         i);
2696                                 clear_port_feature(hdev, i,
2697                                         USB_PORT_FEAT_C_RESET);
2698                         }
2699
2700                         if (connect_change)
2701                                 hub_port_connect_change(hub, i,
2702                                                 portstatus, portchange);
2703                 } /* end for i */
2704
2705                 /* deal with hub status changes */
2706                 if (test_and_clear_bit(0, hub->event_bits) == 0)
2707                         ;       /* do nothing */
2708                 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2709                         dev_err (hub_dev, "get_hub_status failed\n");
2710                 else {
2711                         if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2712                                 dev_dbg (hub_dev, "power change\n");
2713                                 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2714                                 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2715                                         /* FIXME: Is this always true? */
2716                                         hub->limited_power = 0;
2717                                 else
2718                                         hub->limited_power = 1;
2719                         }
2720                         if (hubchange & HUB_CHANGE_OVERCURRENT) {
2721                                 dev_dbg (hub_dev, "overcurrent change\n");
2722                                 msleep(500);    /* Cool down */
2723                                 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2724                                 hub_power_on(hub);
2725                         }
2726                 }
2727
2728                 hub->activating = 0;
2729
2730                 /* If this is a root hub, tell the HCD it's okay to
2731                  * re-enable port-change interrupts now. */
2732                 if (!hdev->parent && !hub->busy_bits[0])
2733                         usb_enable_root_hub_irq(hdev->bus);
2734
2735 loop:
2736                 usb_unlock_device(hdev);
2737                 usb_put_intf(intf);
2738
2739         } /* end while (1) */
2740 }
2741
2742 static int hub_thread(void *__unused)
2743 {
2744         do {
2745                 hub_events();
2746                 wait_event_interruptible(khubd_wait,
2747                                 !list_empty(&hub_event_list) ||
2748                                 kthread_should_stop());
2749                 try_to_freeze();
2750         } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2751
2752         pr_debug("%s: khubd exiting\n", usbcore_name);
2753         return 0;
2754 }
2755
2756 static struct usb_device_id hub_id_table [] = {
2757     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2758       .bDeviceClass = USB_CLASS_HUB},
2759     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2760       .bInterfaceClass = USB_CLASS_HUB},
2761     { }                                         /* Terminating entry */
2762 };
2763
2764 MODULE_DEVICE_TABLE (usb, hub_id_table);
2765
2766 static struct usb_driver hub_driver = {
2767         .name =         "hub",
2768         .probe =        hub_probe,
2769         .disconnect =   hub_disconnect,
2770         .suspend =      hub_suspend,
2771         .resume =       hub_resume,
2772         .pre_reset =    hub_pre_reset,
2773         .post_reset =   hub_post_reset,
2774         .ioctl =        hub_ioctl,
2775         .id_table =     hub_id_table,
2776 };
2777
2778 int usb_hub_init(void)
2779 {
2780         if (usb_register(&hub_driver) < 0) {
2781                 printk(KERN_ERR "%s: can't register hub driver\n",
2782                         usbcore_name);
2783                 return -1;
2784         }
2785
2786         khubd_task = kthread_run(hub_thread, NULL, "khubd");
2787         if (!IS_ERR(khubd_task))
2788                 return 0;
2789
2790         /* Fall through if kernel_thread failed */
2791         usb_deregister(&hub_driver);
2792         printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2793
2794         return -1;
2795 }
2796
2797 void usb_hub_cleanup(void)
2798 {
2799         kthread_stop(khubd_task);
2800
2801         /*
2802          * Hub resources are freed for us by usb_deregister. It calls
2803          * usb_driver_purge on every device which in turn calls that
2804          * devices disconnect function if it is using this driver.
2805          * The hub_disconnect function takes care of releasing the
2806          * individual hub resources. -greg
2807          */
2808         usb_deregister(&hub_driver);
2809 } /* usb_hub_cleanup() */
2810
2811 static int config_descriptors_changed(struct usb_device *udev)
2812 {
2813         unsigned                        index;
2814         unsigned                        len = 0;
2815         struct usb_config_descriptor    *buf;
2816
2817         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2818                 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2819                         len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2820         }
2821         buf = kmalloc (len, SLAB_KERNEL);
2822         if (buf == NULL) {
2823                 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2824                 /* assume the worst */
2825                 return 1;
2826         }
2827         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2828                 int length;
2829                 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2830
2831                 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2832                                 old_length);
2833                 if (length < old_length) {
2834                         dev_dbg(&udev->dev, "config index %d, error %d\n",
2835                                         index, length);
2836                         break;
2837                 }
2838                 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2839                                 != 0) {
2840                         dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2841                                 index, buf->bConfigurationValue);
2842                         break;
2843                 }
2844         }
2845         kfree(buf);
2846         return index != udev->descriptor.bNumConfigurations;
2847 }
2848
2849 /**
2850  * usb_reset_device - perform a USB port reset to reinitialize a device
2851  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2852  *
2853  * WARNING - don't use this routine to reset a composite device
2854  * (one with multiple interfaces owned by separate drivers)!
2855  * Use usb_reset_composite_device() instead.
2856  *
2857  * Do a port reset, reassign the device's address, and establish its
2858  * former operating configuration.  If the reset fails, or the device's
2859  * descriptors change from their values before the reset, or the original
2860  * configuration and altsettings cannot be restored, a flag will be set
2861  * telling khubd to pretend the device has been disconnected and then
2862  * re-connected.  All drivers will be unbound, and the device will be
2863  * re-enumerated and probed all over again.
2864  *
2865  * Returns 0 if the reset succeeded, -ENODEV if the device has been
2866  * flagged for logical disconnection, or some other negative error code
2867  * if the reset wasn't even attempted.
2868  *
2869  * The caller must own the device lock.  For example, it's safe to use
2870  * this from a driver probe() routine after downloading new firmware.
2871  * For calls that might not occur during probe(), drivers should lock
2872  * the device using usb_lock_device_for_reset().
2873  */
2874 int usb_reset_device(struct usb_device *udev)
2875 {
2876         struct usb_device               *parent_hdev = udev->parent;
2877         struct usb_hub                  *parent_hub;
2878         struct usb_device_descriptor    descriptor = udev->descriptor;
2879         int                             i, ret = 0;
2880         int                             port1 = udev->portnum;
2881
2882         if (udev->state == USB_STATE_NOTATTACHED ||
2883                         udev->state == USB_STATE_SUSPENDED) {
2884                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2885                                 udev->state);
2886                 return -EINVAL;
2887         }
2888
2889         if (!parent_hdev) {
2890                 /* this requires hcd-specific logic; see OHCI hc_restart() */
2891                 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2892                 return -EISDIR;
2893         }
2894         parent_hub = hdev_to_hub(parent_hdev);
2895
2896         set_bit(port1, parent_hub->busy_bits);
2897         for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2898
2899                 /* ep0 maxpacket size may change; let the HCD know about it.
2900                  * Other endpoints will be handled by re-enumeration. */
2901                 ep0_reinit(udev);
2902                 ret = hub_port_init(parent_hub, udev, port1, i);
2903                 if (ret >= 0)
2904                         break;
2905         }
2906         clear_bit(port1, parent_hub->busy_bits);
2907         if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2908                 usb_enable_root_hub_irq(parent_hdev->bus);
2909
2910         if (ret < 0)
2911                 goto re_enumerate;
2912  
2913         /* Device might have changed firmware (DFU or similar) */
2914         if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2915                         || config_descriptors_changed (udev)) {
2916                 dev_info(&udev->dev, "device firmware changed\n");
2917                 udev->descriptor = descriptor;  /* for disconnect() calls */
2918                 goto re_enumerate;
2919         }
2920   
2921         if (!udev->actconfig)
2922                 goto done;
2923
2924         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2925                         USB_REQ_SET_CONFIGURATION, 0,
2926                         udev->actconfig->desc.bConfigurationValue, 0,
2927                         NULL, 0, USB_CTRL_SET_TIMEOUT);
2928         if (ret < 0) {
2929                 dev_err(&udev->dev,
2930                         "can't restore configuration #%d (error=%d)\n",
2931                         udev->actconfig->desc.bConfigurationValue, ret);
2932                 goto re_enumerate;
2933         }
2934         usb_set_device_state(udev, USB_STATE_CONFIGURED);
2935
2936         for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
2937                 struct usb_interface *intf = udev->actconfig->interface[i];
2938                 struct usb_interface_descriptor *desc;
2939
2940                 /* set_interface resets host side toggle even
2941                  * for altsetting zero.  the interface may have no driver.
2942                  */
2943                 desc = &intf->cur_altsetting->desc;
2944                 ret = usb_set_interface(udev, desc->bInterfaceNumber,
2945                         desc->bAlternateSetting);
2946                 if (ret < 0) {
2947                         dev_err(&udev->dev, "failed to restore interface %d "
2948                                 "altsetting %d (error=%d)\n",
2949                                 desc->bInterfaceNumber,
2950                                 desc->bAlternateSetting,
2951                                 ret);
2952                         goto re_enumerate;
2953                 }
2954         }
2955
2956 done:
2957         return 0;
2958  
2959 re_enumerate:
2960         hub_port_logical_disconnect(parent_hub, port1);
2961         return -ENODEV;
2962 }
2963 EXPORT_SYMBOL(usb_reset_device);
2964
2965 /**
2966  * usb_reset_composite_device - warn interface drivers and perform a USB port reset
2967  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2968  * @iface: interface bound to the driver making the request (optional)
2969  *
2970  * Warns all drivers bound to registered interfaces (using their pre_reset
2971  * method), performs the port reset, and then lets the drivers know that
2972  * the reset is over (using their post_reset method).
2973  *
2974  * Return value is the same as for usb_reset_device().
2975  *
2976  * The caller must own the device lock.  For example, it's safe to use
2977  * this from a driver probe() routine after downloading new firmware.
2978  * For calls that might not occur during probe(), drivers should lock
2979  * the device using usb_lock_device_for_reset().
2980  *
2981  * The interface locks are acquired during the pre_reset stage and released
2982  * during the post_reset stage.  However if iface is not NULL and is
2983  * currently being probed, we assume that the caller already owns its
2984  * lock.
2985  */
2986 int usb_reset_composite_device(struct usb_device *udev,
2987                 struct usb_interface *iface)
2988 {
2989         int ret;
2990         struct usb_host_config *config = udev->actconfig;
2991
2992         if (udev->state == USB_STATE_NOTATTACHED ||
2993                         udev->state == USB_STATE_SUSPENDED) {
2994                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2995                                 udev->state);
2996                 return -EINVAL;
2997         }
2998
2999         /* Prevent autosuspend during the reset */
3000         usb_autoresume_device(udev, 1);
3001
3002         if (iface && iface->condition != USB_INTERFACE_BINDING)
3003                 iface = NULL;
3004
3005         if (config) {
3006                 int i;
3007                 struct usb_interface *cintf;
3008                 struct usb_driver *drv;
3009
3010                 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3011                         cintf = config->interface[i];
3012                         if (cintf != iface)
3013                                 down(&cintf->dev.sem);
3014                         if (device_is_registered(&cintf->dev) &&
3015                                         cintf->dev.driver) {
3016                                 drv = to_usb_driver(cintf->dev.driver);
3017                                 if (drv->pre_reset)
3018                                         (drv->pre_reset)(cintf);
3019                         }
3020                 }
3021         }
3022
3023         ret = usb_reset_device(udev);
3024
3025         if (config) {
3026                 int i;
3027                 struct usb_interface *cintf;
3028                 struct usb_driver *drv;
3029
3030                 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3031                         cintf = config->interface[i];
3032                         if (device_is_registered(&cintf->dev) &&
3033                                         cintf->dev.driver) {
3034                                 drv = to_usb_driver(cintf->dev.driver);
3035                                 if (drv->post_reset)
3036                                         (drv->post_reset)(cintf);
3037                         }
3038                         if (cintf != iface)
3039                                 up(&cintf->dev.sem);
3040                 }
3041         }
3042
3043         usb_autosuspend_device(udev, 1);
3044         return ret;
3045 }
3046 EXPORT_SYMBOL(usb_reset_composite_device);