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