[PATCH] usbcore: Use kzalloc instead of kmalloc/memset
[linux-2.6.git] / 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 #ifdef CONFIG_USB_DEBUG
13         #define DEBUG
14 #else
15         #undef DEBUG
16 #endif
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/completion.h>
22 #include <linux/sched.h>
23 #include <linux/list.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/ioctl.h>
27 #include <linux/usb.h>
28 #include <linux/usbdevice_fs.h>
29 #include <linux/kthread.h>
30
31 #include <asm/semaphore.h>
32 #include <asm/uaccess.h>
33 #include <asm/byteorder.h>
34
35 #include "usb.h"
36 #include "hcd.h"
37 #include "hub.h"
38
39 /* Protect struct usb_device->state and ->children members
40  * Note: Both are also protected by ->serialize, except that ->state can
41  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
42 static DEFINE_SPINLOCK(device_state_lock);
43
44 /* khubd's worklist and its lock */
45 static DEFINE_SPINLOCK(hub_event_lock);
46 static LIST_HEAD(hub_event_list);       /* List of hubs needing servicing */
47
48 /* Wakes up khubd */
49 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
50
51 static struct task_struct *khubd_task;
52
53 /* cycle leds on hubs that aren't blinking for attention */
54 static int blinkenlights = 0;
55 module_param (blinkenlights, bool, S_IRUGO);
56 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
57
58 /*
59  * As of 2.6.10 we introduce a new USB device initialization scheme which
60  * closely resembles the way Windows works.  Hopefully it will be compatible
61  * with a wider range of devices than the old scheme.  However some previously
62  * working devices may start giving rise to "device not accepting address"
63  * errors; if that happens the user can try the old scheme by adjusting the
64  * following module parameters.
65  *
66  * For maximum flexibility there are two boolean parameters to control the
67  * hub driver's behavior.  On the first initialization attempt, if the
68  * "old_scheme_first" parameter is set then the old scheme will be used,
69  * otherwise the new scheme is used.  If that fails and "use_both_schemes"
70  * is set, then the driver will make another attempt, using the other scheme.
71  */
72 static int old_scheme_first = 0;
73 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
74 MODULE_PARM_DESC(old_scheme_first,
75                  "start with the old device initialization scheme");
76
77 static int use_both_schemes = 1;
78 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
79 MODULE_PARM_DESC(use_both_schemes,
80                 "try the other device initialization scheme if the "
81                 "first one fails");
82
83
84 #ifdef  DEBUG
85 static inline char *portspeed (int portstatus)
86 {
87         if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
88                 return "480 Mb/s";
89         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
90                 return "1.5 Mb/s";
91         else
92                 return "12 Mb/s";
93 }
94 #endif
95
96 /* Note that hdev or one of its children must be locked! */
97 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
98 {
99         return usb_get_intfdata(hdev->actconfig->interface[0]);
100 }
101
102 /* USB 2.0 spec Section 11.24.4.5 */
103 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
104 {
105         int i, ret;
106
107         for (i = 0; i < 3; i++) {
108                 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
109                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
110                         USB_DT_HUB << 8, 0, data, size,
111                         USB_CTRL_GET_TIMEOUT);
112                 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
113                         return ret;
114         }
115         return -EINVAL;
116 }
117
118 /*
119  * USB 2.0 spec Section 11.24.2.1
120  */
121 static int clear_hub_feature(struct usb_device *hdev, int feature)
122 {
123         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
124                 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
125 }
126
127 /*
128  * USB 2.0 spec Section 11.24.2.2
129  */
130 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
131 {
132         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
133                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
134                 NULL, 0, 1000);
135 }
136
137 /*
138  * USB 2.0 spec Section 11.24.2.13
139  */
140 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
141 {
142         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
143                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
144                 NULL, 0, 1000);
145 }
146
147 /*
148  * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
149  * for info about using port indicators
150  */
151 static void set_port_led(
152         struct usb_hub *hub,
153         int port1,
154         int selector
155 )
156 {
157         int status = set_port_feature(hub->hdev, (selector << 8) | port1,
158                         USB_PORT_FEAT_INDICATOR);
159         if (status < 0)
160                 dev_dbg (hub->intfdev,
161                         "port %d indicator %s status %d\n",
162                         port1,
163                         ({ char *s; switch (selector) {
164                         case HUB_LED_AMBER: s = "amber"; break;
165                         case HUB_LED_GREEN: s = "green"; break;
166                         case HUB_LED_OFF: s = "off"; break;
167                         case HUB_LED_AUTO: s = "auto"; break;
168                         default: s = "??"; break;
169                         }; s; }),
170                         status);
171 }
172
173 #define LED_CYCLE_PERIOD        ((2*HZ)/3)
174
175 static void led_work (void *__hub)
176 {
177         struct usb_hub          *hub = __hub;
178         struct usb_device       *hdev = hub->hdev;
179         unsigned                i;
180         unsigned                changed = 0;
181         int                     cursor = -1;
182
183         if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
184                 return;
185
186         for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
187                 unsigned        selector, mode;
188
189                 /* 30%-50% duty cycle */
190
191                 switch (hub->indicator[i]) {
192                 /* cycle marker */
193                 case INDICATOR_CYCLE:
194                         cursor = i;
195                         selector = HUB_LED_AUTO;
196                         mode = INDICATOR_AUTO;
197                         break;
198                 /* blinking green = sw attention */
199                 case INDICATOR_GREEN_BLINK:
200                         selector = HUB_LED_GREEN;
201                         mode = INDICATOR_GREEN_BLINK_OFF;
202                         break;
203                 case INDICATOR_GREEN_BLINK_OFF:
204                         selector = HUB_LED_OFF;
205                         mode = INDICATOR_GREEN_BLINK;
206                         break;
207                 /* blinking amber = hw attention */
208                 case INDICATOR_AMBER_BLINK:
209                         selector = HUB_LED_AMBER;
210                         mode = INDICATOR_AMBER_BLINK_OFF;
211                         break;
212                 case INDICATOR_AMBER_BLINK_OFF:
213                         selector = HUB_LED_OFF;
214                         mode = INDICATOR_AMBER_BLINK;
215                         break;
216                 /* blink green/amber = reserved */
217                 case INDICATOR_ALT_BLINK:
218                         selector = HUB_LED_GREEN;
219                         mode = INDICATOR_ALT_BLINK_OFF;
220                         break;
221                 case INDICATOR_ALT_BLINK_OFF:
222                         selector = HUB_LED_AMBER;
223                         mode = INDICATOR_ALT_BLINK;
224                         break;
225                 default:
226                         continue;
227                 }
228                 if (selector != HUB_LED_AUTO)
229                         changed = 1;
230                 set_port_led(hub, i + 1, selector);
231                 hub->indicator[i] = mode;
232         }
233         if (!changed && blinkenlights) {
234                 cursor++;
235                 cursor %= hub->descriptor->bNbrPorts;
236                 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
237                 hub->indicator[cursor] = INDICATOR_CYCLE;
238                 changed++;
239         }
240         if (changed)
241                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
242 }
243
244 /* use a short timeout for hub/port status fetches */
245 #define USB_STS_TIMEOUT         1000
246 #define USB_STS_RETRIES         5
247
248 /*
249  * USB 2.0 spec Section 11.24.2.6
250  */
251 static int get_hub_status(struct usb_device *hdev,
252                 struct usb_hub_status *data)
253 {
254         int i, status = -ETIMEDOUT;
255
256         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
257                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
258                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
259                         data, sizeof(*data), USB_STS_TIMEOUT);
260         }
261         return status;
262 }
263
264 /*
265  * USB 2.0 spec Section 11.24.2.7
266  */
267 static int get_port_status(struct usb_device *hdev, int port1,
268                 struct usb_port_status *data)
269 {
270         int i, status = -ETIMEDOUT;
271
272         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
273                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
274                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
275                         data, sizeof(*data), USB_STS_TIMEOUT);
276         }
277         return status;
278 }
279
280 static void kick_khubd(struct usb_hub *hub)
281 {
282         unsigned long   flags;
283
284         spin_lock_irqsave(&hub_event_lock, flags);
285         if (list_empty(&hub->event_list)) {
286                 list_add_tail(&hub->event_list, &hub_event_list);
287                 wake_up(&khubd_wait);
288         }
289         spin_unlock_irqrestore(&hub_event_lock, flags);
290 }
291
292 void usb_kick_khubd(struct usb_device *hdev)
293 {
294         kick_khubd(hdev_to_hub(hdev));
295 }
296
297
298 /* completion function, fires on port status changes and various faults */
299 static void hub_irq(struct urb *urb, struct pt_regs *regs)
300 {
301         struct usb_hub *hub = (struct usb_hub *)urb->context;
302         int status;
303         int i;
304         unsigned long bits;
305
306         switch (urb->status) {
307         case -ENOENT:           /* synchronous unlink */
308         case -ECONNRESET:       /* async unlink */
309         case -ESHUTDOWN:        /* hardware going away */
310                 return;
311
312         default:                /* presumably an error */
313                 /* Cause a hub reset after 10 consecutive errors */
314                 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
315                 if ((++hub->nerrors < 10) || hub->error)
316                         goto resubmit;
317                 hub->error = urb->status;
318                 /* FALL THROUGH */
319         
320         /* let khubd handle things */
321         case 0:                 /* we got data:  port status changed */
322                 bits = 0;
323                 for (i = 0; i < urb->actual_length; ++i)
324                         bits |= ((unsigned long) ((*hub->buffer)[i]))
325                                         << (i*8);
326                 hub->event_bits[0] = bits;
327                 break;
328         }
329
330         hub->nerrors = 0;
331
332         /* Something happened, let khubd figure it out */
333         kick_khubd(hub);
334
335 resubmit:
336         if (hub->quiescing)
337                 return;
338
339         if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
340                         && status != -ENODEV && status != -EPERM)
341                 dev_err (hub->intfdev, "resubmit --> %d\n", status);
342 }
343
344 /* USB 2.0 spec Section 11.24.2.3 */
345 static inline int
346 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
347 {
348         return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
349                                HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
350                                tt, NULL, 0, 1000);
351 }
352
353 /*
354  * enumeration blocks khubd for a long time. we use keventd instead, since
355  * long blocking there is the exception, not the rule.  accordingly, HCDs
356  * talking to TTs must queue control transfers (not just bulk and iso), so
357  * both can talk to the same hub concurrently.
358  */
359 static void hub_tt_kevent (void *arg)
360 {
361         struct usb_hub          *hub = arg;
362         unsigned long           flags;
363
364         spin_lock_irqsave (&hub->tt.lock, flags);
365         while (!list_empty (&hub->tt.clear_list)) {
366                 struct list_head        *temp;
367                 struct usb_tt_clear     *clear;
368                 struct usb_device       *hdev = hub->hdev;
369                 int                     status;
370
371                 temp = hub->tt.clear_list.next;
372                 clear = list_entry (temp, struct usb_tt_clear, clear_list);
373                 list_del (&clear->clear_list);
374
375                 /* drop lock so HCD can concurrently report other TT errors */
376                 spin_unlock_irqrestore (&hub->tt.lock, flags);
377                 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
378                 spin_lock_irqsave (&hub->tt.lock, flags);
379
380                 if (status)
381                         dev_err (&hdev->dev,
382                                 "clear tt %d (%04x) error %d\n",
383                                 clear->tt, clear->devinfo, status);
384                 kfree(clear);
385         }
386         spin_unlock_irqrestore (&hub->tt.lock, flags);
387 }
388
389 /**
390  * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
391  * @udev: the device whose split transaction failed
392  * @pipe: identifies the endpoint of the failed transaction
393  *
394  * High speed HCDs use this to tell the hub driver that some split control or
395  * bulk transaction failed in a way that requires clearing internal state of
396  * a transaction translator.  This is normally detected (and reported) from
397  * interrupt context.
398  *
399  * It may not be possible for that hub to handle additional full (or low)
400  * speed transactions until that state is fully cleared out.
401  */
402 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
403 {
404         struct usb_tt           *tt = udev->tt;
405         unsigned long           flags;
406         struct usb_tt_clear     *clear;
407
408         /* we've got to cope with an arbitrary number of pending TT clears,
409          * since each TT has "at least two" buffers that can need it (and
410          * there can be many TTs per hub).  even if they're uncommon.
411          */
412         if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
413                 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
414                 /* FIXME recover somehow ... RESET_TT? */
415                 return;
416         }
417
418         /* info that CLEAR_TT_BUFFER needs */
419         clear->tt = tt->multi ? udev->ttport : 1;
420         clear->devinfo = usb_pipeendpoint (pipe);
421         clear->devinfo |= udev->devnum << 4;
422         clear->devinfo |= usb_pipecontrol (pipe)
423                         ? (USB_ENDPOINT_XFER_CONTROL << 11)
424                         : (USB_ENDPOINT_XFER_BULK << 11);
425         if (usb_pipein (pipe))
426                 clear->devinfo |= 1 << 15;
427         
428         /* tell keventd to clear state for this TT */
429         spin_lock_irqsave (&tt->lock, flags);
430         list_add_tail (&clear->clear_list, &tt->clear_list);
431         schedule_work (&tt->kevent);
432         spin_unlock_irqrestore (&tt->lock, flags);
433 }
434
435 static void hub_power_on(struct usb_hub *hub)
436 {
437         int port1;
438         unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
439         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
440
441         /* if hub supports power switching, enable power on each port */
442         if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
443                 dev_dbg(hub->intfdev, "enabling power on all ports\n");
444                 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
445                         set_port_feature(hub->hdev, port1,
446                                         USB_PORT_FEAT_POWER);
447         }
448
449         /* Wait at least 100 msec for power to become stable */
450         msleep(max(pgood_delay, (unsigned) 100));
451 }
452
453 static inline void __hub_quiesce(struct usb_hub *hub)
454 {
455         /* (nonblocking) khubd and related activity won't re-trigger */
456         hub->quiescing = 1;
457         hub->activating = 0;
458         hub->resume_root_hub = 0;
459 }
460
461 static void hub_quiesce(struct usb_hub *hub)
462 {
463         /* (blocking) stop khubd and related activity */
464         __hub_quiesce(hub);
465         usb_kill_urb(hub->urb);
466         if (hub->has_indicators)
467                 cancel_delayed_work(&hub->leds);
468         if (hub->has_indicators || hub->tt.hub)
469                 flush_scheduled_work();
470 }
471
472 static void hub_activate(struct usb_hub *hub)
473 {
474         int     status;
475
476         hub->quiescing = 0;
477         hub->activating = 1;
478         hub->resume_root_hub = 0;
479         status = usb_submit_urb(hub->urb, GFP_NOIO);
480         if (status < 0)
481                 dev_err(hub->intfdev, "activate --> %d\n", status);
482         if (hub->has_indicators && blinkenlights)
483                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
484
485         /* scan all ports ASAP */
486         kick_khubd(hub);
487 }
488
489 static int hub_hub_status(struct usb_hub *hub,
490                 u16 *status, u16 *change)
491 {
492         int ret;
493
494         ret = get_hub_status(hub->hdev, &hub->status->hub);
495         if (ret < 0)
496                 dev_err (hub->intfdev,
497                         "%s failed (err = %d)\n", __FUNCTION__, ret);
498         else {
499                 *status = le16_to_cpu(hub->status->hub.wHubStatus);
500                 *change = le16_to_cpu(hub->status->hub.wHubChange); 
501                 ret = 0;
502         }
503         return ret;
504 }
505
506 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
507 {
508         struct usb_device *hdev = hub->hdev;
509         int ret;
510
511         if (hdev->children[port1-1] && set_state) {
512                 usb_set_device_state(hdev->children[port1-1],
513                                 USB_STATE_NOTATTACHED);
514         }
515         ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
516         if (ret)
517                 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
518                         port1, ret);
519
520         return ret;
521 }
522
523 static int hub_configure(struct usb_hub *hub,
524         struct usb_endpoint_descriptor *endpoint)
525 {
526         struct usb_device *hdev = hub->hdev;
527         struct device *hub_dev = hub->intfdev;
528         u16 hubstatus, hubchange;
529         u16 wHubCharacteristics;
530         unsigned int pipe;
531         int maxp, ret;
532         char *message;
533
534         hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
535                         &hub->buffer_dma);
536         if (!hub->buffer) {
537                 message = "can't allocate hub irq buffer";
538                 ret = -ENOMEM;
539                 goto fail;
540         }
541
542         hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
543         if (!hub->status) {
544                 message = "can't kmalloc hub status buffer";
545                 ret = -ENOMEM;
546                 goto fail;
547         }
548
549         hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
550         if (!hub->descriptor) {
551                 message = "can't kmalloc hub descriptor";
552                 ret = -ENOMEM;
553                 goto fail;
554         }
555
556         /* Request the entire hub descriptor.
557          * hub->descriptor can handle USB_MAXCHILDREN ports,
558          * but the hub can/will return fewer bytes here.
559          */
560         ret = get_hub_descriptor(hdev, hub->descriptor,
561                         sizeof(*hub->descriptor));
562         if (ret < 0) {
563                 message = "can't read hub descriptor";
564                 goto fail;
565         } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
566                 message = "hub has too many ports!";
567                 ret = -ENODEV;
568                 goto fail;
569         }
570
571         hdev->maxchild = hub->descriptor->bNbrPorts;
572         dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
573                 (hdev->maxchild == 1) ? "" : "s");
574
575         wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
576
577         if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
578                 int     i;
579                 char    portstr [USB_MAXCHILDREN + 1];
580
581                 for (i = 0; i < hdev->maxchild; i++)
582                         portstr[i] = hub->descriptor->DeviceRemovable
583                                     [((i + 1) / 8)] & (1 << ((i + 1) % 8))
584                                 ? 'F' : 'R';
585                 portstr[hdev->maxchild] = 0;
586                 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
587         } else
588                 dev_dbg(hub_dev, "standalone hub\n");
589
590         switch (wHubCharacteristics & HUB_CHAR_LPSM) {
591                 case 0x00:
592                         dev_dbg(hub_dev, "ganged power switching\n");
593                         break;
594                 case 0x01:
595                         dev_dbg(hub_dev, "individual port power switching\n");
596                         break;
597                 case 0x02:
598                 case 0x03:
599                         dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
600                         break;
601         }
602
603         switch (wHubCharacteristics & HUB_CHAR_OCPM) {
604                 case 0x00:
605                         dev_dbg(hub_dev, "global over-current protection\n");
606                         break;
607                 case 0x08:
608                         dev_dbg(hub_dev, "individual port over-current protection\n");
609                         break;
610                 case 0x10:
611                 case 0x18:
612                         dev_dbg(hub_dev, "no over-current protection\n");
613                         break;
614         }
615
616         spin_lock_init (&hub->tt.lock);
617         INIT_LIST_HEAD (&hub->tt.clear_list);
618         INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
619         switch (hdev->descriptor.bDeviceProtocol) {
620                 case 0:
621                         break;
622                 case 1:
623                         dev_dbg(hub_dev, "Single TT\n");
624                         hub->tt.hub = hdev;
625                         break;
626                 case 2:
627                         ret = usb_set_interface(hdev, 0, 1);
628                         if (ret == 0) {
629                                 dev_dbg(hub_dev, "TT per port\n");
630                                 hub->tt.multi = 1;
631                         } else
632                                 dev_err(hub_dev, "Using single TT (err %d)\n",
633                                         ret);
634                         hub->tt.hub = hdev;
635                         break;
636                 default:
637                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
638                                 hdev->descriptor.bDeviceProtocol);
639                         break;
640         }
641
642         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
643         switch (wHubCharacteristics & HUB_CHAR_TTTT) {
644                 case HUB_TTTT_8_BITS:
645                         if (hdev->descriptor.bDeviceProtocol != 0) {
646                                 hub->tt.think_time = 666;
647                                 dev_dbg(hub_dev, "TT requires at most %d "
648                                                 "FS bit times (%d ns)\n",
649                                         8, hub->tt.think_time);
650                         }
651                         break;
652                 case HUB_TTTT_16_BITS:
653                         hub->tt.think_time = 666 * 2;
654                         dev_dbg(hub_dev, "TT requires at most %d "
655                                         "FS bit times (%d ns)\n",
656                                 16, hub->tt.think_time);
657                         break;
658                 case HUB_TTTT_24_BITS:
659                         hub->tt.think_time = 666 * 3;
660                         dev_dbg(hub_dev, "TT requires at most %d "
661                                         "FS bit times (%d ns)\n",
662                                 24, hub->tt.think_time);
663                         break;
664                 case HUB_TTTT_32_BITS:
665                         hub->tt.think_time = 666 * 4;
666                         dev_dbg(hub_dev, "TT requires at most %d "
667                                         "FS bit times (%d ns)\n",
668                                 32, hub->tt.think_time);
669                         break;
670         }
671
672         /* probe() zeroes hub->indicator[] */
673         if (wHubCharacteristics & HUB_CHAR_PORTIND) {
674                 hub->has_indicators = 1;
675                 dev_dbg(hub_dev, "Port indicators are supported\n");
676         }
677
678         dev_dbg(hub_dev, "power on to power good time: %dms\n",
679                 hub->descriptor->bPwrOn2PwrGood * 2);
680
681         /* power budgeting mostly matters with bus-powered hubs,
682          * and battery-powered root hubs (may provide just 8 mA).
683          */
684         ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
685         if (ret < 0) {
686                 message = "can't get hub status";
687                 goto fail;
688         }
689         le16_to_cpus(&hubstatus);
690         if (hdev == hdev->bus->root_hub) {
691                 struct usb_hcd *hcd =
692                                 container_of(hdev->bus, struct usb_hcd, self);
693
694                 hub->power_budget = min(500u, hcd->power_budget) / 2;
695         } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
696                 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
697                         hub->descriptor->bHubContrCurrent);
698                 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
699                                         / 2;
700         }
701         if (hub->power_budget)
702                 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
703                         hub->power_budget * 2);
704
705
706         ret = hub_hub_status(hub, &hubstatus, &hubchange);
707         if (ret < 0) {
708                 message = "can't get hub status";
709                 goto fail;
710         }
711
712         /* local power status reports aren't always correct */
713         if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
714                 dev_dbg(hub_dev, "local power source is %s\n",
715                         (hubstatus & HUB_STATUS_LOCAL_POWER)
716                         ? "lost (inactive)" : "good");
717
718         if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
719                 dev_dbg(hub_dev, "%sover-current condition exists\n",
720                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
721
722         /* set up the interrupt endpoint */
723         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
724         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
725
726         if (maxp > sizeof(*hub->buffer))
727                 maxp = sizeof(*hub->buffer);
728
729         hub->urb = usb_alloc_urb(0, GFP_KERNEL);
730         if (!hub->urb) {
731                 message = "couldn't allocate interrupt urb";
732                 ret = -ENOMEM;
733                 goto fail;
734         }
735
736         usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
737                 hub, endpoint->bInterval);
738         hub->urb->transfer_dma = hub->buffer_dma;
739         hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
740
741         /* maybe cycle the hub leds */
742         if (hub->has_indicators && blinkenlights)
743                 hub->indicator [0] = INDICATOR_CYCLE;
744
745         hub_power_on(hub);
746         hub_activate(hub);
747         return 0;
748
749 fail:
750         dev_err (hub_dev, "config failed, %s (err %d)\n",
751                         message, ret);
752         /* hub_disconnect() frees urb and descriptor */
753         return ret;
754 }
755
756 static unsigned highspeed_hubs;
757
758 /* Called after the hub driver is unbound from a hub with children */
759 static void hub_remove_children_work(void *__hub)
760 {
761         struct usb_hub          *hub = __hub;
762         struct usb_device       *hdev = hub->hdev;
763         int                     i;
764
765         kfree(hub);
766
767         usb_lock_device(hdev);
768         for (i = 0; i < hdev->maxchild; ++i) {
769                 if (hdev->children[i])
770                         usb_disconnect(&hdev->children[i]);
771         }
772         usb_unlock_device(hdev);
773         usb_put_dev(hdev);
774 }
775
776 static void hub_disconnect(struct usb_interface *intf)
777 {
778         struct usb_hub *hub = usb_get_intfdata (intf);
779         struct usb_device *hdev;
780         int n, port1;
781
782         usb_set_intfdata (intf, NULL);
783         hdev = hub->hdev;
784
785         if (hdev->speed == USB_SPEED_HIGH)
786                 highspeed_hubs--;
787
788         hub_quiesce(hub);
789         usb_free_urb(hub->urb);
790         hub->urb = NULL;
791
792         spin_lock_irq(&hub_event_lock);
793         list_del_init(&hub->event_list);
794         spin_unlock_irq(&hub_event_lock);
795
796         kfree(hub->descriptor);
797         hub->descriptor = NULL;
798
799         kfree(hub->status);
800         hub->status = NULL;
801
802         if (hub->buffer) {
803                 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
804                                 hub->buffer_dma);
805                 hub->buffer = NULL;
806         }
807
808         /* If there are any children then this is an unbind only, not a
809          * physical disconnection.  The active ports must be disabled
810          * and later on we must call usb_disconnect().  We can't call
811          * it now because we may not hold the hub's device lock.
812          */
813         n = 0;
814         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
815                 if (hdev->children[port1 - 1]) {
816                         ++n;
817                         hub_port_disable(hub, port1, 1);
818                 }
819         }
820
821         if (n == 0)
822                 kfree(hub);
823         else {
824                 /* Reuse the hub->leds work_struct for our own purposes */
825                 INIT_WORK(&hub->leds, hub_remove_children_work, hub);
826                 schedule_work(&hub->leds);
827                 usb_get_dev(hdev);
828         }
829 }
830
831 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
832 {
833         struct usb_host_interface *desc;
834         struct usb_endpoint_descriptor *endpoint;
835         struct usb_device *hdev;
836         struct usb_hub *hub;
837
838         desc = intf->cur_altsetting;
839         hdev = interface_to_usbdev(intf);
840
841         /* Some hubs have a subclass of 1, which AFAICT according to the */
842         /*  specs is not defined, but it works */
843         if ((desc->desc.bInterfaceSubClass != 0) &&
844             (desc->desc.bInterfaceSubClass != 1)) {
845 descriptor_error:
846                 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
847                 return -EIO;
848         }
849
850         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
851         if (desc->desc.bNumEndpoints != 1)
852                 goto descriptor_error;
853
854         endpoint = &desc->endpoint[0].desc;
855
856         /* Output endpoint? Curiouser and curiouser.. */
857         if (!(endpoint->bEndpointAddress & USB_DIR_IN))
858                 goto descriptor_error;
859
860         /* If it's not an interrupt endpoint, we'd better punt! */
861         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
862                         != USB_ENDPOINT_XFER_INT)
863                 goto descriptor_error;
864
865         /* We found a hub */
866         dev_info (&intf->dev, "USB hub found\n");
867
868         hub = kzalloc(sizeof(*hub), GFP_KERNEL);
869         if (!hub) {
870                 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
871                 return -ENOMEM;
872         }
873
874         INIT_LIST_HEAD(&hub->event_list);
875         hub->intfdev = &intf->dev;
876         hub->hdev = hdev;
877         INIT_WORK(&hub->leds, led_work, hub);
878
879         usb_set_intfdata (intf, hub);
880
881         if (hdev->speed == USB_SPEED_HIGH)
882                 highspeed_hubs++;
883
884         if (hub_configure(hub, endpoint) >= 0)
885                 return 0;
886
887         hub_disconnect (intf);
888         return -ENODEV;
889 }
890
891 static int
892 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
893 {
894         struct usb_device *hdev = interface_to_usbdev (intf);
895
896         /* assert ifno == 0 (part of hub spec) */
897         switch (code) {
898         case USBDEVFS_HUB_PORTINFO: {
899                 struct usbdevfs_hub_portinfo *info = user_data;
900                 int i;
901
902                 spin_lock_irq(&device_state_lock);
903                 if (hdev->devnum <= 0)
904                         info->nports = 0;
905                 else {
906                         info->nports = hdev->maxchild;
907                         for (i = 0; i < info->nports; i++) {
908                                 if (hdev->children[i] == NULL)
909                                         info->port[i] = 0;
910                                 else
911                                         info->port[i] =
912                                                 hdev->children[i]->devnum;
913                         }
914                 }
915                 spin_unlock_irq(&device_state_lock);
916
917                 return info->nports + 1;
918                 }
919
920         default:
921                 return -ENOSYS;
922         }
923 }
924
925 /* caller has locked the hub device */
926 static void hub_pre_reset(struct usb_hub *hub)
927 {
928         struct usb_device *hdev = hub->hdev;
929         int i;
930
931         for (i = 0; i < hdev->maxchild; ++i) {
932                 if (hdev->children[i])
933                         usb_disconnect(&hdev->children[i]);
934         }
935         hub_quiesce(hub);
936 }
937
938 /* caller has locked the hub device */
939 static void hub_post_reset(struct usb_hub *hub)
940 {
941         hub_activate(hub);
942         hub_power_on(hub);
943 }
944
945
946 /* grab device/port lock, returning index of that port (zero based).
947  * protects the upstream link used by this device from concurrent
948  * tree operations like suspend, resume, reset, and disconnect, which
949  * apply to everything downstream of a given port.
950  */
951 static int locktree(struct usb_device *udev)
952 {
953         int                     t;
954         struct usb_device       *hdev;
955
956         if (!udev)
957                 return -ENODEV;
958
959         /* root hub is always the first lock in the series */
960         hdev = udev->parent;
961         if (!hdev) {
962                 usb_lock_device(udev);
963                 return 0;
964         }
965
966         /* on the path from root to us, lock everything from
967          * top down, dropping parent locks when not needed
968          */
969         t = locktree(hdev);
970         if (t < 0)
971                 return t;
972         for (t = 0; t < hdev->maxchild; t++) {
973                 if (hdev->children[t] == udev) {
974                         /* everything is fail-fast once disconnect
975                          * processing starts
976                          */
977                         if (udev->state == USB_STATE_NOTATTACHED)
978                                 break;
979
980                         /* when everyone grabs locks top->bottom,
981                          * non-overlapping work may be concurrent
982                          */
983                         down(&udev->serialize);
984                         up(&hdev->serialize);
985                         return t + 1;
986                 }
987         }
988         usb_unlock_device(hdev);
989         return -ENODEV;
990 }
991
992 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
993 {
994         int i;
995
996         for (i = 0; i < udev->maxchild; ++i) {
997                 if (udev->children[i])
998                         recursively_mark_NOTATTACHED(udev->children[i]);
999         }
1000         udev->state = USB_STATE_NOTATTACHED;
1001 }
1002
1003 /**
1004  * usb_set_device_state - change a device's current state (usbcore, hcds)
1005  * @udev: pointer to device whose state should be changed
1006  * @new_state: new state value to be stored
1007  *
1008  * udev->state is _not_ fully protected by the device lock.  Although
1009  * most transitions are made only while holding the lock, the state can
1010  * can change to USB_STATE_NOTATTACHED at almost any time.  This
1011  * is so that devices can be marked as disconnected as soon as possible,
1012  * without having to wait for any semaphores to be released.  As a result,
1013  * all changes to any device's state must be protected by the
1014  * device_state_lock spinlock.
1015  *
1016  * Once a device has been added to the device tree, all changes to its state
1017  * should be made using this routine.  The state should _not_ be set directly.
1018  *
1019  * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1020  * Otherwise udev->state is set to new_state, and if new_state is
1021  * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1022  * to USB_STATE_NOTATTACHED.
1023  */
1024 void usb_set_device_state(struct usb_device *udev,
1025                 enum usb_device_state new_state)
1026 {
1027         unsigned long flags;
1028
1029         spin_lock_irqsave(&device_state_lock, flags);
1030         if (udev->state == USB_STATE_NOTATTACHED)
1031                 ;       /* do nothing */
1032         else if (new_state != USB_STATE_NOTATTACHED) {
1033                 udev->state = new_state;
1034                 if (new_state == USB_STATE_CONFIGURED)
1035                         device_init_wakeup(&udev->dev,
1036                                 (udev->actconfig->desc.bmAttributes
1037                                  & USB_CONFIG_ATT_WAKEUP));
1038                 else if (new_state != USB_STATE_SUSPENDED)
1039                         device_init_wakeup(&udev->dev, 0);
1040         } else
1041                 recursively_mark_NOTATTACHED(udev);
1042         spin_unlock_irqrestore(&device_state_lock, flags);
1043 }
1044 EXPORT_SYMBOL(usb_set_device_state);
1045
1046
1047 static void choose_address(struct usb_device *udev)
1048 {
1049         int             devnum;
1050         struct usb_bus  *bus = udev->bus;
1051
1052         /* If khubd ever becomes multithreaded, this will need a lock */
1053
1054         /* Try to allocate the next devnum beginning at bus->devnum_next. */
1055         devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1056                         bus->devnum_next);
1057         if (devnum >= 128)
1058                 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1059
1060         bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1061
1062         if (devnum < 128) {
1063                 set_bit(devnum, bus->devmap.devicemap);
1064                 udev->devnum = devnum;
1065         }
1066 }
1067
1068 static void release_address(struct usb_device *udev)
1069 {
1070         if (udev->devnum > 0) {
1071                 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1072                 udev->devnum = -1;
1073         }
1074 }
1075
1076 /**
1077  * usb_disconnect - disconnect a device (usbcore-internal)
1078  * @pdev: pointer to device being disconnected
1079  * Context: !in_interrupt ()
1080  *
1081  * Something got disconnected. Get rid of it and all of its children.
1082  *
1083  * If *pdev is a normal device then the parent hub must already be locked.
1084  * If *pdev is a root hub then this routine will acquire the
1085  * usb_bus_list_lock on behalf of the caller.
1086  *
1087  * Only hub drivers (including virtual root hub drivers for host
1088  * controllers) should ever call this.
1089  *
1090  * This call is synchronous, and may not be used in an interrupt context.
1091  */
1092 void usb_disconnect(struct usb_device **pdev)
1093 {
1094         struct usb_device       *udev = *pdev;
1095         int                     i;
1096
1097         if (!udev) {
1098                 pr_debug ("%s nodev\n", __FUNCTION__);
1099                 return;
1100         }
1101
1102         /* mark the device as inactive, so any further urb submissions for
1103          * this device (and any of its children) will fail immediately.
1104          * this quiesces everyting except pending urbs.
1105          */
1106         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1107
1108         /* lock the bus list on behalf of HCDs unregistering their root hubs */
1109         if (!udev->parent) {
1110                 down(&usb_bus_list_lock);
1111                 usb_lock_device(udev);
1112         } else
1113                 down(&udev->serialize);
1114
1115         dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1116
1117         /* Free up all the children before we remove this device */
1118         for (i = 0; i < USB_MAXCHILDREN; i++) {
1119                 if (udev->children[i])
1120                         usb_disconnect(&udev->children[i]);
1121         }
1122
1123         /* deallocate hcd/hardware state ... nuking all pending urbs and
1124          * cleaning up all state associated with the current configuration
1125          * so that the hardware is now fully quiesced.
1126          */
1127         usb_disable_device(udev, 0);
1128
1129         usb_notify_remove_device(udev);
1130
1131         /* Free the device number, remove the /proc/bus/usb entry and
1132          * the sysfs attributes, and delete the parent's children[]
1133          * (or root_hub) pointer.
1134          */
1135         dev_dbg (&udev->dev, "unregistering device\n");
1136         release_address(udev);
1137         usb_remove_sysfs_dev_files(udev);
1138
1139         /* Avoid races with recursively_mark_NOTATTACHED() */
1140         spin_lock_irq(&device_state_lock);
1141         *pdev = NULL;
1142         spin_unlock_irq(&device_state_lock);
1143
1144         if (!udev->parent) {
1145                 usb_unlock_device(udev);
1146                 up(&usb_bus_list_lock);
1147         } else
1148                 up(&udev->serialize);
1149
1150         device_unregister(&udev->dev);
1151 }
1152
1153 static int choose_configuration(struct usb_device *udev)
1154 {
1155         int c, i;
1156
1157         /* NOTE: this should interact with hub power budgeting */
1158
1159         c = udev->config[0].desc.bConfigurationValue;
1160         if (udev->descriptor.bNumConfigurations != 1) {
1161                 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1162                         struct usb_interface_descriptor *desc;
1163
1164                         /* heuristic:  Linux is more likely to have class
1165                          * drivers, so avoid vendor-specific interfaces.
1166                          */
1167                         desc = &udev->config[i].intf_cache[0]
1168                                         ->altsetting->desc;
1169                         if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1170                                 continue;
1171                         /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1172                          * MSFT needs this to be the first config; never use
1173                          * it as the default unless Linux has host-side RNDIS.
1174                          * A second config would ideally be CDC-Ethernet, but
1175                          * may instead be the "vendor specific" CDC subset
1176                          * long used by ARM Linux for sa1100 or pxa255.
1177                          */
1178                         if (desc->bInterfaceClass == USB_CLASS_COMM
1179                                         && desc->bInterfaceSubClass == 2
1180                                         && desc->bInterfaceProtocol == 0xff) {
1181                                 c = udev->config[1].desc.bConfigurationValue;
1182                                 continue;
1183                         }
1184                         c = udev->config[i].desc.bConfigurationValue;
1185                         break;
1186                 }
1187                 dev_info(&udev->dev,
1188                         "configuration #%d chosen from %d choices\n",
1189                         c, udev->descriptor.bNumConfigurations);
1190         }
1191         return c;
1192 }
1193
1194 #ifdef DEBUG
1195 static void show_string(struct usb_device *udev, char *id, char *string)
1196 {
1197         if (!string)
1198                 return;
1199         dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1200 }
1201
1202 #else
1203 static inline void show_string(struct usb_device *udev, char *id, char *string)
1204 {}
1205 #endif
1206
1207 static void get_string(struct usb_device *udev, char **string, int index)
1208 {
1209         char *buf;
1210
1211         if (!index)
1212                 return;
1213         buf = kmalloc(256, GFP_KERNEL);
1214         if (!buf)
1215                 return;
1216         if (usb_string(udev, index, buf, 256) > 0)
1217                 *string = buf;
1218         else
1219                 kfree(buf);
1220 }
1221
1222
1223 #ifdef  CONFIG_USB_OTG
1224 #include "otg_whitelist.h"
1225 #endif
1226
1227 /**
1228  * usb_new_device - perform initial device setup (usbcore-internal)
1229  * @udev: newly addressed device (in ADDRESS state)
1230  *
1231  * This is called with devices which have been enumerated, but not yet
1232  * configured.  The device descriptor is available, but not descriptors
1233  * for any device configuration.  The caller must have locked udev and
1234  * either the parent hub (if udev is a normal device) or else the
1235  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1236  * udev has already been installed, but udev is not yet visible through
1237  * sysfs or other filesystem code.
1238  *
1239  * Returns 0 for success (device is configured and listed, with its
1240  * interfaces, in sysfs); else a negative errno value.
1241  *
1242  * This call is synchronous, and may not be used in an interrupt context.
1243  *
1244  * Only the hub driver should ever call this; root hub registration
1245  * uses it indirectly.
1246  */
1247 int usb_new_device(struct usb_device *udev)
1248 {
1249         int err;
1250         int c;
1251
1252         err = usb_get_configuration(udev);
1253         if (err < 0) {
1254                 dev_err(&udev->dev, "can't read configurations, error %d\n",
1255                         err);
1256                 goto fail;
1257         }
1258
1259         /* read the standard strings and cache them if present */
1260         get_string(udev, &udev->product, udev->descriptor.iProduct);
1261         get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);
1262         get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);
1263
1264         /* Tell the world! */
1265         dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1266                         "SerialNumber=%d\n",
1267                         udev->descriptor.iManufacturer,
1268                         udev->descriptor.iProduct,
1269                         udev->descriptor.iSerialNumber);
1270         show_string(udev, "Product", udev->product);
1271         show_string(udev, "Manufacturer", udev->manufacturer);
1272         show_string(udev, "SerialNumber", udev->serial);
1273
1274 #ifdef  CONFIG_USB_OTG
1275         /*
1276          * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1277          * to wake us after we've powered off VBUS; and HNP, switching roles
1278          * "host" to "peripheral".  The OTG descriptor helps figure this out.
1279          */
1280         if (!udev->bus->is_b_host
1281                         && udev->config
1282                         && udev->parent == udev->bus->root_hub) {
1283                 struct usb_otg_descriptor       *desc = 0;
1284                 struct usb_bus                  *bus = udev->bus;
1285
1286                 /* descriptor may appear anywhere in config */
1287                 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1288                                         le16_to_cpu(udev->config[0].desc.wTotalLength),
1289                                         USB_DT_OTG, (void **) &desc) == 0) {
1290                         if (desc->bmAttributes & USB_OTG_HNP) {
1291                                 unsigned                port1;
1292                                 struct usb_device       *root = udev->parent;
1293                                 
1294                                 for (port1 = 1; port1 <= root->maxchild;
1295                                                 port1++) {
1296                                         if (root->children[port1-1] == udev)
1297                                                 break;
1298                                 }
1299
1300                                 dev_info(&udev->dev,
1301                                         "Dual-Role OTG device on %sHNP port\n",
1302                                         (port1 == bus->otg_port)
1303                                                 ? "" : "non-");
1304
1305                                 /* enable HNP before suspend, it's simpler */
1306                                 if (port1 == bus->otg_port)
1307                                         bus->b_hnp_enable = 1;
1308                                 err = usb_control_msg(udev,
1309                                         usb_sndctrlpipe(udev, 0),
1310                                         USB_REQ_SET_FEATURE, 0,
1311                                         bus->b_hnp_enable
1312                                                 ? USB_DEVICE_B_HNP_ENABLE
1313                                                 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1314                                         0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1315                                 if (err < 0) {
1316                                         /* OTG MESSAGE: report errors here,
1317                                          * customize to match your product.
1318                                          */
1319                                         dev_info(&udev->dev,
1320                                                 "can't set HNP mode; %d\n",
1321                                                 err);
1322                                         bus->b_hnp_enable = 0;
1323                                 }
1324                         }
1325                 }
1326         }
1327
1328         if (!is_targeted(udev)) {
1329
1330                 /* Maybe it can talk to us, though we can't talk to it.
1331                  * (Includes HNP test device.)
1332                  */
1333                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1334                         static int __usb_suspend_device(struct usb_device *,
1335                                                 int port1);
1336                         err = __usb_suspend_device(udev, udev->bus->otg_port);
1337                         if (err < 0)
1338                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1339                 }
1340                 err = -ENODEV;
1341                 goto fail;
1342         }
1343 #endif
1344
1345         /* put device-specific files into sysfs */
1346         err = device_add (&udev->dev);
1347         if (err) {
1348                 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1349                 goto fail;
1350         }
1351         usb_create_sysfs_dev_files (udev);
1352
1353         /* choose and set the configuration. that registers the interfaces
1354          * with the driver core, and lets usb device drivers bind to them.
1355          */
1356         c = choose_configuration(udev);
1357         if (c < 0)
1358                 dev_warn(&udev->dev,
1359                                 "can't choose an initial configuration\n");
1360         else {
1361                 err = usb_set_configuration(udev, c);
1362                 if (err) {
1363                         dev_err(&udev->dev, "can't set config #%d, error %d\n",
1364                                         c, err);
1365                         usb_remove_sysfs_dev_files(udev);
1366                         device_del(&udev->dev);
1367                         goto fail;
1368                 }
1369         }
1370
1371         /* USB device state == configured ... usable */
1372         usb_notify_add_device(udev);
1373
1374         return 0;
1375
1376 fail:
1377         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1378         return err;
1379 }
1380
1381
1382 static int hub_port_status(struct usb_hub *hub, int port1,
1383                                u16 *status, u16 *change)
1384 {
1385         int ret;
1386
1387         ret = get_port_status(hub->hdev, port1, &hub->status->port);
1388         if (ret < 0)
1389                 dev_err (hub->intfdev,
1390                         "%s failed (err = %d)\n", __FUNCTION__, ret);
1391         else {
1392                 *status = le16_to_cpu(hub->status->port.wPortStatus);
1393                 *change = le16_to_cpu(hub->status->port.wPortChange); 
1394                 ret = 0;
1395         }
1396         return ret;
1397 }
1398
1399 #define PORT_RESET_TRIES        5
1400 #define SET_ADDRESS_TRIES       2
1401 #define GET_DESCRIPTOR_TRIES    2
1402 #define SET_CONFIG_TRIES        (2 * (use_both_schemes + 1))
1403 #define USE_NEW_SCHEME(i)       ((i) / 2 == old_scheme_first)
1404
1405 #define HUB_ROOT_RESET_TIME     50      /* times are in msec */
1406 #define HUB_SHORT_RESET_TIME    10
1407 #define HUB_LONG_RESET_TIME     200
1408 #define HUB_RESET_TIMEOUT       500
1409
1410 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1411                                 struct usb_device *udev, unsigned int delay)
1412 {
1413         int delay_time, ret;
1414         u16 portstatus;
1415         u16 portchange;
1416
1417         for (delay_time = 0;
1418                         delay_time < HUB_RESET_TIMEOUT;
1419                         delay_time += delay) {
1420                 /* wait to give the device a chance to reset */
1421                 msleep(delay);
1422
1423                 /* read and decode port status */
1424                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1425                 if (ret < 0)
1426                         return ret;
1427
1428                 /* Device went away? */
1429                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1430                         return -ENOTCONN;
1431
1432                 /* bomb out completely if something weird happened */
1433                 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1434                         return -EINVAL;
1435
1436                 /* if we`ve finished resetting, then break out of the loop */
1437                 if (!(portstatus & USB_PORT_STAT_RESET) &&
1438                     (portstatus & USB_PORT_STAT_ENABLE)) {
1439                         if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1440                                 udev->speed = USB_SPEED_HIGH;
1441                         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1442                                 udev->speed = USB_SPEED_LOW;
1443                         else
1444                                 udev->speed = USB_SPEED_FULL;
1445                         return 0;
1446                 }
1447
1448                 /* switch to the long delay after two short delay failures */
1449                 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1450                         delay = HUB_LONG_RESET_TIME;
1451
1452                 dev_dbg (hub->intfdev,
1453                         "port %d not reset yet, waiting %dms\n",
1454                         port1, delay);
1455         }
1456
1457         return -EBUSY;
1458 }
1459
1460 static int hub_port_reset(struct usb_hub *hub, int port1,
1461                                 struct usb_device *udev, unsigned int delay)
1462 {
1463         int i, status;
1464
1465         /* Reset the port */
1466         for (i = 0; i < PORT_RESET_TRIES; i++) {
1467                 status = set_port_feature(hub->hdev,
1468                                 port1, USB_PORT_FEAT_RESET);
1469                 if (status)
1470                         dev_err(hub->intfdev,
1471                                         "cannot reset port %d (err = %d)\n",
1472                                         port1, status);
1473                 else {
1474                         status = hub_port_wait_reset(hub, port1, udev, delay);
1475                         if (status && status != -ENOTCONN)
1476                                 dev_dbg(hub->intfdev,
1477                                                 "port_wait_reset: err = %d\n",
1478                                                 status);
1479                 }
1480
1481                 /* return on disconnect or reset */
1482                 switch (status) {
1483                 case 0:
1484                         /* TRSTRCY = 10 ms; plus some extra */
1485                         msleep(10 + 40);
1486                         /* FALL THROUGH */
1487                 case -ENOTCONN:
1488                 case -ENODEV:
1489                         clear_port_feature(hub->hdev,
1490                                 port1, USB_PORT_FEAT_C_RESET);
1491                         /* FIXME need disconnect() for NOTATTACHED device */
1492                         usb_set_device_state(udev, status
1493                                         ? USB_STATE_NOTATTACHED
1494                                         : USB_STATE_DEFAULT);
1495                         return status;
1496                 }
1497
1498                 dev_dbg (hub->intfdev,
1499                         "port %d not enabled, trying reset again...\n",
1500                         port1);
1501                 delay = HUB_LONG_RESET_TIME;
1502         }
1503
1504         dev_err (hub->intfdev,
1505                 "Cannot enable port %i.  Maybe the USB cable is bad?\n",
1506                 port1);
1507
1508         return status;
1509 }
1510
1511 /*
1512  * Disable a port and mark a logical connnect-change event, so that some
1513  * time later khubd will disconnect() any existing usb_device on the port
1514  * and will re-enumerate if there actually is a device attached.
1515  */
1516 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1517 {
1518         dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1519         hub_port_disable(hub, port1, 1);
1520
1521         /* FIXME let caller ask to power down the port:
1522          *  - some devices won't enumerate without a VBUS power cycle
1523          *  - SRP saves power that way
1524          *  - ... new call, TBD ...
1525          * That's easy if this hub can switch power per-port, and
1526          * khubd reactivates the port later (timer, SRP, etc).
1527          * Powerdown must be optional, because of reset/DFU.
1528          */
1529
1530         set_bit(port1, hub->change_bits);
1531         kick_khubd(hub);
1532 }
1533
1534
1535 #ifdef  CONFIG_USB_SUSPEND
1536
1537 /*
1538  * Selective port suspend reduces power; most suspended devices draw
1539  * less than 500 uA.  It's also used in OTG, along with remote wakeup.
1540  * All devices below the suspended port are also suspended.
1541  *
1542  * Devices leave suspend state when the host wakes them up.  Some devices
1543  * also support "remote wakeup", where the device can activate the USB
1544  * tree above them to deliver data, such as a keypress or packet.  In
1545  * some cases, this wakes the USB host.
1546  */
1547 static int hub_port_suspend(struct usb_hub *hub, int port1,
1548                 struct usb_device *udev)
1549 {
1550         int     status;
1551
1552         // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1553
1554         /* enable remote wakeup when appropriate; this lets the device
1555          * wake up the upstream hub (including maybe the root hub).
1556          *
1557          * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
1558          * we don't explicitly enable it here.
1559          */
1560         if (device_may_wakeup(&udev->dev)) {
1561                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1562                                 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1563                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1564                                 NULL, 0,
1565                                 USB_CTRL_SET_TIMEOUT);
1566                 if (status)
1567                         dev_dbg(&udev->dev,
1568                                 "won't remote wakeup, status %d\n",
1569                                 status);
1570         }
1571
1572         /* see 7.1.7.6 */
1573         status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1574         if (status) {
1575                 dev_dbg(hub->intfdev,
1576                         "can't suspend port %d, status %d\n",
1577                         port1, status);
1578                 /* paranoia:  "should not happen" */
1579                 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1580                                 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1581                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1582                                 NULL, 0,
1583                                 USB_CTRL_SET_TIMEOUT);
1584         } else {
1585                 /* device has up to 10 msec to fully suspend */
1586                 dev_dbg(&udev->dev, "usb suspend\n");
1587                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1588                 msleep(10);
1589         }
1590         return status;
1591 }
1592
1593 /*
1594  * Devices on USB hub ports have only one "suspend" state, corresponding
1595  * to ACPI D2, "may cause the device to lose some context".
1596  * State transitions include:
1597  *
1598  *   - suspend, resume ... when the VBUS power link stays live
1599  *   - suspend, disconnect ... VBUS lost
1600  *
1601  * Once VBUS drop breaks the circuit, the port it's using has to go through
1602  * normal re-enumeration procedures, starting with enabling VBUS power.
1603  * Other than re-initializing the hub (plug/unplug, except for root hubs),
1604  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
1605  * timer, no SRP, no requests through sysfs.
1606  *
1607  * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1608  * the root hub for their bus goes into global suspend ... so we don't
1609  * (falsely) update the device power state to say it suspended.
1610  */
1611 static int __usb_suspend_device (struct usb_device *udev, int port1)
1612 {
1613         int     status = 0;
1614
1615         /* caller owns the udev device lock */
1616         if (port1 < 0)
1617                 return port1;
1618
1619         if (udev->state == USB_STATE_SUSPENDED
1620                         || udev->state == USB_STATE_NOTATTACHED) {
1621                 return 0;
1622         }
1623
1624         /* all interfaces must already be suspended */
1625         if (udev->actconfig) {
1626                 int     i;
1627
1628                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1629                         struct usb_interface    *intf;
1630
1631                         intf = udev->actconfig->interface[i];
1632                         if (is_active(intf)) {
1633                                 dev_dbg(&intf->dev, "nyet suspended\n");
1634                                 return -EBUSY;
1635                         }
1636                 }
1637         }
1638
1639         /* we only change a device's upstream USB link.
1640          * root hubs have no upstream USB link.
1641          */
1642         if (udev->parent)
1643                 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1644                                 udev);
1645
1646         if (status == 0)
1647                 udev->dev.power.power_state = PMSG_SUSPEND;
1648         return status;
1649 }
1650
1651 #endif
1652
1653 /*
1654  * usb_suspend_device - suspend a usb device
1655  * @udev: device that's no longer in active use
1656  * Context: must be able to sleep; device not locked; pm locks held
1657  *
1658  * Suspends a USB device that isn't in active use, conserving power.
1659  * Devices may wake out of a suspend, if anything important happens,
1660  * using the remote wakeup mechanism.  They may also be taken out of
1661  * suspend by the host, using usb_resume_device().  It's also routine
1662  * to disconnect devices while they are suspended.
1663  *
1664  * This only affects the USB hardware for a device; its interfaces
1665  * (and, for hubs, child devices) must already have been suspended.
1666  *
1667  * Suspending OTG devices may trigger HNP, if that's been enabled
1668  * between a pair of dual-role devices.  That will change roles, such
1669  * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1670  *
1671  * Returns 0 on success, else negative errno.
1672  */
1673 int usb_suspend_device(struct usb_device *udev)
1674 {
1675 #ifdef  CONFIG_USB_SUSPEND
1676         int     port1, status;
1677
1678         port1 = locktree(udev);
1679         if (port1 < 0)
1680                 return port1;
1681
1682         status = __usb_suspend_device(udev, port1);
1683         usb_unlock_device(udev);
1684         return status;
1685 #else
1686         /* NOTE:  udev->state unchanged, it's not lying ... */
1687         udev->dev.power.power_state = PMSG_SUSPEND;
1688         return 0;
1689 #endif
1690 }
1691
1692
1693 /*
1694  * If the USB "suspend" state is in use (rather than "global suspend"),
1695  * many devices will be individually taken out of suspend state using
1696  * special" resume" signaling.  These routines kick in shortly after
1697  * hardware resume signaling is finished, either because of selective
1698  * resume (by host) or remote wakeup (by device) ... now see what changed
1699  * in the tree that's rooted at this device.
1700  */
1701 static int finish_device_resume(struct usb_device *udev)
1702 {
1703         int     status;
1704         u16     devstatus;
1705
1706         /* caller owns the udev device lock */
1707         dev_dbg(&udev->dev, "finish resume\n");
1708
1709         /* usb ch9 identifies four variants of SUSPENDED, based on what
1710          * state the device resumes to.  Linux currently won't see the
1711          * first two on the host side; they'd be inside hub_port_init()
1712          * during many timeouts, but khubd can't suspend until later.
1713          */
1714         usb_set_device_state(udev, udev->actconfig
1715                         ? USB_STATE_CONFIGURED
1716                         : USB_STATE_ADDRESS);
1717
1718         /* 10.5.4.5 says be sure devices in the tree are still there.
1719          * For now let's assume the device didn't go crazy on resume,
1720          * and device drivers will know about any resume quirks.
1721          */
1722         status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1723         if (status < 0)
1724                 dev_dbg(&udev->dev,
1725                         "gone after usb resume? status %d\n",
1726                         status);
1727         else if (udev->actconfig) {
1728                 unsigned        i;
1729                 int             (*resume)(struct device *);
1730
1731                 le16_to_cpus(&devstatus);
1732                 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
1733                                 && udev->parent) {
1734                         status = usb_control_msg(udev,
1735                                         usb_sndctrlpipe(udev, 0),
1736                                         USB_REQ_CLEAR_FEATURE,
1737                                                 USB_RECIP_DEVICE,
1738                                         USB_DEVICE_REMOTE_WAKEUP, 0,
1739                                         NULL, 0,
1740                                         USB_CTRL_SET_TIMEOUT);
1741                         if (status) {
1742                                 dev_dbg(&udev->dev, "disable remote "
1743                                         "wakeup, status %d\n", status);
1744                                 status = 0;
1745                         }
1746                 }
1747
1748                 /* resume interface drivers; if this is a hub, it
1749                  * may have a child resume event to deal with soon
1750                  */
1751                 resume = udev->dev.bus->resume;
1752                 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++)
1753                         (void) resume(&udev->actconfig->interface[i]->dev);
1754                 status = 0;
1755
1756         } else if (udev->devnum <= 0) {
1757                 dev_dbg(&udev->dev, "bogus resume!\n");
1758                 status = -EINVAL;
1759         }
1760         return status;
1761 }
1762
1763 #ifdef  CONFIG_USB_SUSPEND
1764
1765 static int
1766 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1767 {
1768         int     status;
1769
1770         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1771
1772         /* see 7.1.7.7; affects power usage, but not budgeting */
1773         status = clear_port_feature(hub->hdev,
1774                         port1, USB_PORT_FEAT_SUSPEND);
1775         if (status) {
1776                 dev_dbg(hub->intfdev,
1777                         "can't resume port %d, status %d\n",
1778                         port1, status);
1779         } else {
1780                 u16             devstatus;
1781                 u16             portchange;
1782
1783                 /* drive resume for at least 20 msec */
1784                 if (udev)
1785                         dev_dbg(&udev->dev, "RESUME\n");
1786                 msleep(25);
1787
1788 #define LIVE_FLAGS      ( USB_PORT_STAT_POWER \
1789                         | USB_PORT_STAT_ENABLE \
1790                         | USB_PORT_STAT_CONNECTION)
1791
1792                 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1793                  * stop resume signaling.  Then finish the resume
1794                  * sequence.
1795                  */
1796                 devstatus = portchange = 0;
1797                 status = hub_port_status(hub, port1,
1798                                 &devstatus, &portchange);
1799                 if (status < 0
1800                                 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1801                                 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1802                                 ) {
1803                         dev_dbg(hub->intfdev,
1804                                 "port %d status %04x.%04x after resume, %d\n",
1805                                 port1, portchange, devstatus, status);
1806                 } else {
1807                         /* TRSMRCY = 10 msec */
1808                         msleep(10);
1809                         if (udev)
1810                                 status = finish_device_resume(udev);
1811                 }
1812         }
1813         if (status < 0)
1814                 hub_port_logical_disconnect(hub, port1);
1815
1816         return status;
1817 }
1818
1819 #endif
1820
1821 /*
1822  * usb_resume_device - re-activate a suspended usb device
1823  * @udev: device to re-activate
1824  * Context: must be able to sleep; device not locked; pm locks held
1825  *
1826  * This will re-activate the suspended device, increasing power usage
1827  * while letting drivers communicate again with its endpoints.
1828  * USB resume explicitly guarantees that the power session between
1829  * the host and the device is the same as it was when the device
1830  * suspended.
1831  *
1832  * Returns 0 on success, else negative errno.
1833  */
1834 int usb_resume_device(struct usb_device *udev)
1835 {
1836         int     port1, status;
1837
1838         port1 = locktree(udev);
1839         if (port1 < 0)
1840                 return port1;
1841
1842 #ifdef  CONFIG_USB_SUSPEND
1843         /* selective resume of one downstream hub-to-device port */
1844         if (udev->parent) {
1845                 if (udev->state == USB_STATE_SUSPENDED) {
1846                         // NOTE swsusp may bork us, device state being wrong...
1847                         // NOTE this fails if parent is also suspended...
1848                         status = hub_port_resume(hdev_to_hub(udev->parent),
1849                                         port1, udev);
1850                 } else
1851                         status = 0;
1852         } else
1853 #endif
1854                 status = finish_device_resume(udev);
1855         if (status < 0)
1856                 dev_dbg(&udev->dev, "can't resume, status %d\n",
1857                         status);
1858
1859         usb_unlock_device(udev);
1860
1861         /* rebind drivers that had no suspend() */
1862         if (status == 0) {
1863                 usb_lock_all_devices();
1864                 bus_rescan_devices(&usb_bus_type);
1865                 usb_unlock_all_devices();
1866         }
1867         return status;
1868 }
1869
1870 static int remote_wakeup(struct usb_device *udev)
1871 {
1872         int     status = 0;
1873
1874 #ifdef  CONFIG_USB_SUSPEND
1875
1876         /* don't repeat RESUME sequence if this device
1877          * was already woken up by some other task
1878          */
1879         down(&udev->serialize);
1880         if (udev->state == USB_STATE_SUSPENDED) {
1881                 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1882                 /* TRSMRCY = 10 msec */
1883                 msleep(10);
1884                 status = finish_device_resume(udev);
1885         }
1886         up(&udev->serialize);
1887 #endif
1888         return status;
1889 }
1890
1891 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1892 {
1893         struct usb_hub          *hub = usb_get_intfdata (intf);
1894         struct usb_device       *hdev = hub->hdev;
1895         unsigned                port1;
1896
1897         /* fail if children aren't already suspended */
1898         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1899                 struct usb_device       *udev;
1900
1901                 udev = hdev->children [port1-1];
1902                 if (udev && (udev->dev.power.power_state.event
1903                                         == PM_EVENT_ON
1904 #ifdef  CONFIG_USB_SUSPEND
1905                                 || udev->state != USB_STATE_SUSPENDED
1906 #endif
1907                                 )) {
1908                         dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1909                         return -EBUSY;
1910                 }
1911         }
1912
1913         /* "global suspend" of the downstream HC-to-USB interface */
1914         if (!hdev->parent) {
1915                 struct usb_bus  *bus = hdev->bus;
1916                 if (bus) {
1917                         int     status = hcd_bus_suspend (bus);
1918
1919                         if (status != 0) {
1920                                 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1921                                         status);
1922                                 return status;
1923                         }
1924                 } else
1925                         return -EOPNOTSUPP;
1926         }
1927
1928         /* stop khubd and related activity */
1929         hub_quiesce(hub);
1930         return 0;
1931 }
1932
1933 static int hub_resume(struct usb_interface *intf)
1934 {
1935         struct usb_device       *hdev = interface_to_usbdev(intf);
1936         struct usb_hub          *hub = usb_get_intfdata (intf);
1937         int                     status;
1938
1939         /* "global resume" of the downstream HC-to-USB interface */
1940         if (!hdev->parent) {
1941                 struct usb_bus  *bus = hdev->bus;
1942                 if (bus) {
1943                         status = hcd_bus_resume (bus);
1944                         if (status) {
1945                                 dev_dbg(&intf->dev, "'global' resume %d\n",
1946                                         status);
1947                                 return status;
1948                         }
1949                 } else
1950                         return -EOPNOTSUPP;
1951                 if (status == 0) {
1952                         /* TRSMRCY = 10 msec */
1953                         msleep(10);
1954                 }
1955         }
1956
1957         hub_activate(hub);
1958
1959         /* REVISIT:  this recursion probably shouldn't exist.  Remove
1960          * this code sometime, after retesting with different root and
1961          * external hubs.
1962          */
1963 #ifdef  CONFIG_USB_SUSPEND
1964         {
1965         unsigned                port1;
1966
1967         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1968                 struct usb_device       *udev;
1969                 u16                     portstat, portchange;
1970
1971                 udev = hdev->children [port1-1];
1972                 status = hub_port_status(hub, port1, &portstat, &portchange);
1973                 if (status == 0) {
1974                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
1975                                 clear_port_feature(hdev, port1,
1976                                         USB_PORT_FEAT_C_SUSPEND);
1977                                 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1978                         }
1979
1980                         /* let khubd handle disconnects etc */
1981                         if (portchange)
1982                                 continue;
1983                 }
1984
1985                 if (!udev || status < 0)
1986                         continue;
1987                 down (&udev->serialize);
1988                 if (portstat & USB_PORT_STAT_SUSPEND)
1989                         status = hub_port_resume(hub, port1, udev);
1990                 else {
1991                         status = finish_device_resume(udev);
1992                         if (status < 0) {
1993                                 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1994                                         port1, status);
1995                                 hub_port_logical_disconnect(hub, port1);
1996                         }
1997                 }
1998                 up(&udev->serialize);
1999         }
2000         }
2001 #endif
2002         return 0;
2003 }
2004
2005 void usb_suspend_root_hub(struct usb_device *hdev)
2006 {
2007         struct usb_hub *hub = hdev_to_hub(hdev);
2008
2009         /* This also makes any led blinker stop retriggering.  We're called
2010          * from irq, so the blinker might still be scheduled.  Caller promises
2011          * that the root hub status URB will be canceled.
2012          */
2013         __hub_quiesce(hub);
2014         mark_quiesced(to_usb_interface(hub->intfdev));
2015 }
2016
2017 void usb_resume_root_hub(struct usb_device *hdev)
2018 {
2019         struct usb_hub *hub = hdev_to_hub(hdev);
2020
2021         hub->resume_root_hub = 1;
2022         kick_khubd(hub);
2023 }
2024
2025
2026 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2027  *
2028  * Between connect detection and reset signaling there must be a delay
2029  * of 100ms at least for debounce and power-settling.  The corresponding
2030  * timer shall restart whenever the downstream port detects a disconnect.
2031  * 
2032  * Apparently there are some bluetooth and irda-dongles and a number of
2033  * low-speed devices for which this debounce period may last over a second.
2034  * Not covered by the spec - but easy to deal with.
2035  *
2036  * This implementation uses a 1500ms total debounce timeout; if the
2037  * connection isn't stable by then it returns -ETIMEDOUT.  It checks
2038  * every 25ms for transient disconnects.  When the port status has been
2039  * unchanged for 100ms it returns the port status.
2040  */
2041
2042 #define HUB_DEBOUNCE_TIMEOUT    1500
2043 #define HUB_DEBOUNCE_STEP         25
2044 #define HUB_DEBOUNCE_STABLE      100
2045
2046 static int hub_port_debounce(struct usb_hub *hub, int port1)
2047 {
2048         int ret;
2049         int total_time, stable_time = 0;
2050         u16 portchange, portstatus;
2051         unsigned connection = 0xffff;
2052
2053         for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2054                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2055                 if (ret < 0)
2056                         return ret;
2057
2058                 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2059                      (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2060                         stable_time += HUB_DEBOUNCE_STEP;
2061                         if (stable_time >= HUB_DEBOUNCE_STABLE)
2062                                 break;
2063                 } else {
2064                         stable_time = 0;
2065                         connection = portstatus & USB_PORT_STAT_CONNECTION;
2066                 }
2067
2068                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2069                         clear_port_feature(hub->hdev, port1,
2070                                         USB_PORT_FEAT_C_CONNECTION);
2071                 }
2072
2073                 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2074                         break;
2075                 msleep(HUB_DEBOUNCE_STEP);
2076         }
2077
2078         dev_dbg (hub->intfdev,
2079                 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2080                 port1, total_time, stable_time, portstatus);
2081
2082         if (stable_time < HUB_DEBOUNCE_STABLE)
2083                 return -ETIMEDOUT;
2084         return portstatus;
2085 }
2086
2087 static void ep0_reinit(struct usb_device *udev)
2088 {
2089         usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2090         usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2091         udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2092 }
2093
2094 #define usb_sndaddr0pipe()      (PIPE_CONTROL << 30)
2095 #define usb_rcvaddr0pipe()      ((PIPE_CONTROL << 30) | USB_DIR_IN)
2096
2097 static int hub_set_address(struct usb_device *udev)
2098 {
2099         int retval;
2100
2101         if (udev->devnum == 0)
2102                 return -EINVAL;
2103         if (udev->state == USB_STATE_ADDRESS)
2104                 return 0;
2105         if (udev->state != USB_STATE_DEFAULT)
2106                 return -EINVAL;
2107         retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2108                 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2109                 NULL, 0, USB_CTRL_SET_TIMEOUT);
2110         if (retval == 0) {
2111                 usb_set_device_state(udev, USB_STATE_ADDRESS);
2112                 ep0_reinit(udev);
2113         }
2114         return retval;
2115 }
2116
2117 /* Reset device, (re)assign address, get device descriptor.
2118  * Device connection must be stable, no more debouncing needed.
2119  * Returns device in USB_STATE_ADDRESS, except on error.
2120  *
2121  * If this is called for an already-existing device (as part of
2122  * usb_reset_device), the caller must own the device lock.  For a
2123  * newly detected device that is not accessible through any global
2124  * pointers, it's not necessary to lock the device.
2125  */
2126 static int
2127 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2128                 int retry_counter)
2129 {
2130         static DECLARE_MUTEX(usb_address0_sem);
2131
2132         struct usb_device       *hdev = hub->hdev;
2133         int                     i, j, retval;
2134         unsigned                delay = HUB_SHORT_RESET_TIME;
2135         enum usb_device_speed   oldspeed = udev->speed;
2136
2137         /* root hub ports have a slightly longer reset period
2138          * (from USB 2.0 spec, section 7.1.7.5)
2139          */
2140         if (!hdev->parent) {
2141                 delay = HUB_ROOT_RESET_TIME;
2142                 if (port1 == hdev->bus->otg_port)
2143                         hdev->bus->b_hnp_enable = 0;
2144         }
2145
2146         /* Some low speed devices have problems with the quick delay, so */
2147         /*  be a bit pessimistic with those devices. RHbug #23670 */
2148         if (oldspeed == USB_SPEED_LOW)
2149                 delay = HUB_LONG_RESET_TIME;
2150
2151         down(&usb_address0_sem);
2152
2153         /* Reset the device; full speed may morph to high speed */
2154         retval = hub_port_reset(hub, port1, udev, delay);
2155         if (retval < 0)         /* error or disconnect */
2156                 goto fail;
2157                                 /* success, speed is known */
2158         retval = -ENODEV;
2159
2160         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2161                 dev_dbg(&udev->dev, "device reset changed speed!\n");
2162                 goto fail;
2163         }
2164         oldspeed = udev->speed;
2165   
2166         /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2167          * it's fixed size except for full speed devices.
2168          */
2169         switch (udev->speed) {
2170         case USB_SPEED_HIGH:            /* fixed at 64 */
2171                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2172                 break;
2173         case USB_SPEED_FULL:            /* 8, 16, 32, or 64 */
2174                 /* to determine the ep0 maxpacket size, try to read
2175                  * the device descriptor to get bMaxPacketSize0 and
2176                  * then correct our initial guess.
2177                  */
2178                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2179                 break;
2180         case USB_SPEED_LOW:             /* fixed at 8 */
2181                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2182                 break;
2183         default:
2184                 goto fail;
2185         }
2186  
2187         dev_info (&udev->dev,
2188                         "%s %s speed USB device using %s and address %d\n",
2189                         (udev->config) ? "reset" : "new",
2190                         ({ char *speed; switch (udev->speed) {
2191                         case USB_SPEED_LOW:     speed = "low";  break;
2192                         case USB_SPEED_FULL:    speed = "full"; break;
2193                         case USB_SPEED_HIGH:    speed = "high"; break;
2194                         default:                speed = "?";    break;
2195                         }; speed;}),
2196                         udev->bus->controller->driver->name,
2197                         udev->devnum);
2198
2199         /* Set up TT records, if needed  */
2200         if (hdev->tt) {
2201                 udev->tt = hdev->tt;
2202                 udev->ttport = hdev->ttport;
2203         } else if (udev->speed != USB_SPEED_HIGH
2204                         && hdev->speed == USB_SPEED_HIGH) {
2205                 udev->tt = &hub->tt;
2206                 udev->ttport = port1;
2207         }
2208  
2209         /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2210          * Because device hardware and firmware is sometimes buggy in
2211          * this area, and this is how Linux has done it for ages.
2212          * Change it cautiously.
2213          *
2214          * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2215          * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2216          * so it may help with some non-standards-compliant devices.
2217          * Otherwise we start with SET_ADDRESS and then try to read the
2218          * first 8 bytes of the device descriptor to get the ep0 maxpacket
2219          * value.
2220          */
2221         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2222                 if (USE_NEW_SCHEME(retry_counter)) {
2223                         struct usb_device_descriptor *buf;
2224                         int r = 0;
2225
2226 #define GET_DESCRIPTOR_BUFSIZE  64
2227                         buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2228                         if (!buf) {
2229                                 retval = -ENOMEM;
2230                                 continue;
2231                         }
2232
2233                         /* Use a short timeout the first time through,
2234                          * so that recalcitrant full-speed devices with
2235                          * 8- or 16-byte ep0-maxpackets won't slow things
2236                          * down tremendously by NAKing the unexpectedly
2237                          * early status stage.  Also, retry on all errors;
2238                          * some devices are flakey.
2239                          */
2240                         for (j = 0; j < 3; ++j) {
2241                                 buf->bMaxPacketSize0 = 0;
2242                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2243                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2244                                         USB_DT_DEVICE << 8, 0,
2245                                         buf, GET_DESCRIPTOR_BUFSIZE,
2246                                         (i ? USB_CTRL_GET_TIMEOUT : 1000));
2247                                 switch (buf->bMaxPacketSize0) {
2248                                 case 8: case 16: case 32: case 64:
2249                                         if (buf->bDescriptorType ==
2250                                                         USB_DT_DEVICE) {
2251                                                 r = 0;
2252                                                 break;
2253                                         }
2254                                         /* FALL THROUGH */
2255                                 default:
2256                                         if (r == 0)
2257                                                 r = -EPROTO;
2258                                         break;
2259                                 }
2260                                 if (r == 0)
2261                                         break;
2262                         }
2263                         udev->descriptor.bMaxPacketSize0 =
2264                                         buf->bMaxPacketSize0;
2265                         kfree(buf);
2266
2267                         retval = hub_port_reset(hub, port1, udev, delay);
2268                         if (retval < 0)         /* error or disconnect */
2269                                 goto fail;
2270                         if (oldspeed != udev->speed) {
2271                                 dev_dbg(&udev->dev,
2272                                         "device reset changed speed!\n");
2273                                 retval = -ENODEV;
2274                                 goto fail;
2275                         }
2276                         if (r) {
2277                                 dev_err(&udev->dev, "device descriptor "
2278                                                 "read/%s, error %d\n",
2279                                                 "64", r);
2280                                 retval = -EMSGSIZE;
2281                                 continue;
2282                         }
2283 #undef GET_DESCRIPTOR_BUFSIZE
2284                 }
2285
2286                 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2287                         retval = hub_set_address(udev);
2288                         if (retval >= 0)
2289                                 break;
2290                         msleep(200);
2291                 }
2292                 if (retval < 0) {
2293                         dev_err(&udev->dev,
2294                                 "device not accepting address %d, error %d\n",
2295                                 udev->devnum, retval);
2296                         goto fail;
2297                 }
2298  
2299                 /* cope with hardware quirkiness:
2300                  *  - let SET_ADDRESS settle, some device hardware wants it
2301                  *  - read ep0 maxpacket even for high and low speed,
2302                  */
2303                 msleep(10);
2304                 if (USE_NEW_SCHEME(retry_counter))
2305                         break;
2306
2307                 retval = usb_get_device_descriptor(udev, 8);
2308                 if (retval < 8) {
2309                         dev_err(&udev->dev, "device descriptor "
2310                                         "read/%s, error %d\n",
2311                                         "8", retval);
2312                         if (retval >= 0)
2313                                 retval = -EMSGSIZE;
2314                 } else {
2315                         retval = 0;
2316                         break;
2317                 }
2318         }
2319         if (retval)
2320                 goto fail;
2321
2322         i = udev->descriptor.bMaxPacketSize0;
2323         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2324                 if (udev->speed != USB_SPEED_FULL ||
2325                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2326                         dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2327                         retval = -EMSGSIZE;
2328                         goto fail;
2329                 }
2330                 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2331                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2332                 ep0_reinit(udev);
2333         }
2334   
2335         retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2336         if (retval < (signed)sizeof(udev->descriptor)) {
2337                 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2338                         "all", retval);
2339                 if (retval >= 0)
2340                         retval = -ENOMSG;
2341                 goto fail;
2342         }
2343
2344         retval = 0;
2345
2346 fail:
2347         if (retval)
2348                 hub_port_disable(hub, port1, 0);
2349         up(&usb_address0_sem);
2350         return retval;
2351 }
2352
2353 static void
2354 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2355 {
2356         struct usb_qualifier_descriptor *qual;
2357         int                             status;
2358
2359         qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2360         if (qual == NULL)
2361                 return;
2362
2363         status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2364                         qual, sizeof *qual);
2365         if (status == sizeof *qual) {
2366                 dev_info(&udev->dev, "not running at top speed; "
2367                         "connect to a high speed hub\n");
2368                 /* hub LEDs are probably harder to miss than syslog */
2369                 if (hub->has_indicators) {
2370                         hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2371                         schedule_work (&hub->leds);
2372                 }
2373         }
2374         kfree(qual);
2375 }
2376
2377 static unsigned
2378 hub_power_remaining (struct usb_hub *hub)
2379 {
2380         struct usb_device *hdev = hub->hdev;
2381         int remaining;
2382         unsigned i;
2383
2384         remaining = hub->power_budget;
2385         if (!remaining)         /* self-powered */
2386                 return 0;
2387
2388         for (i = 0; i < hdev->maxchild; i++) {
2389                 struct usb_device       *udev = hdev->children[i];
2390                 int                     delta, ceiling;
2391
2392                 if (!udev)
2393                         continue;
2394
2395                 /* 100mA per-port ceiling, or 8mA for OTG ports */
2396                 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2397                         ceiling = 50;
2398                 else
2399                         ceiling = 4;
2400
2401                 if (udev->actconfig)
2402                         delta = udev->actconfig->desc.bMaxPower;
2403                 else
2404                         delta = ceiling;
2405                 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2406                 if (delta > ceiling)
2407                         dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2408                                 2 * (delta - ceiling), 2 * ceiling);
2409                 remaining -= delta;
2410         }
2411         if (remaining < 0) {
2412                 dev_warn(hub->intfdev,
2413                         "%dmA over power budget!\n",
2414                         -2 * remaining);
2415                 remaining = 0;
2416         }
2417         return remaining;
2418 }
2419
2420 /* Handle physical or logical connection change events.
2421  * This routine is called when:
2422  *      a port connection-change occurs;
2423  *      a port enable-change occurs (often caused by EMI);
2424  *      usb_reset_device() encounters changed descriptors (as from
2425  *              a firmware download)
2426  * caller already locked the hub
2427  */
2428 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2429                                         u16 portstatus, u16 portchange)
2430 {
2431         struct usb_device *hdev = hub->hdev;
2432         struct device *hub_dev = hub->intfdev;
2433         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2434         int status, i;
2435  
2436         dev_dbg (hub_dev,
2437                 "port %d, status %04x, change %04x, %s\n",
2438                 port1, portstatus, portchange, portspeed (portstatus));
2439
2440         if (hub->has_indicators) {
2441                 set_port_led(hub, port1, HUB_LED_AUTO);
2442                 hub->indicator[port1-1] = INDICATOR_AUTO;
2443         }
2444  
2445         /* Disconnect any existing devices under this port */
2446         if (hdev->children[port1-1])
2447                 usb_disconnect(&hdev->children[port1-1]);
2448         clear_bit(port1, hub->change_bits);
2449
2450 #ifdef  CONFIG_USB_OTG
2451         /* during HNP, don't repeat the debounce */
2452         if (hdev->bus->is_b_host)
2453                 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2454 #endif
2455
2456         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2457                 status = hub_port_debounce(hub, port1);
2458                 if (status < 0) {
2459                         dev_err (hub_dev,
2460                                 "connect-debounce failed, port %d disabled\n",
2461                                 port1);
2462                         goto done;
2463                 }
2464                 portstatus = status;
2465         }
2466
2467         /* Return now if nothing is connected */
2468         if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2469
2470                 /* maybe switch power back on (e.g. root hub was reset) */
2471                 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2472                                 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2473                         set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2474  
2475                 if (portstatus & USB_PORT_STAT_ENABLE)
2476                         goto done;
2477                 return;
2478         }
2479
2480 #ifdef  CONFIG_USB_SUSPEND
2481         /* If something is connected, but the port is suspended, wake it up. */
2482         if (portstatus & USB_PORT_STAT_SUSPEND) {
2483                 status = hub_port_resume(hub, port1, NULL);
2484                 if (status < 0) {
2485                         dev_dbg(hub_dev,
2486                                 "can't clear suspend on port %d; %d\n",
2487                                 port1, status);
2488                         goto done;
2489                 }
2490         }
2491 #endif
2492
2493         for (i = 0; i < SET_CONFIG_TRIES; i++) {
2494                 struct usb_device *udev;
2495
2496                 /* reallocate for each attempt, since references
2497                  * to the previous one can escape in various ways
2498                  */
2499                 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2500                 if (!udev) {
2501                         dev_err (hub_dev,
2502                                 "couldn't allocate port %d usb_device\n",
2503                                 port1);
2504                         goto done;
2505                 }
2506
2507                 usb_set_device_state(udev, USB_STATE_POWERED);
2508                 udev->speed = USB_SPEED_UNKNOWN;
2509  
2510                 /* set the address */
2511                 choose_address(udev);
2512                 if (udev->devnum <= 0) {
2513                         status = -ENOTCONN;     /* Don't retry */
2514                         goto loop;
2515                 }
2516
2517                 /* reset and get descriptor */
2518                 status = hub_port_init(hub, udev, port1, i);
2519                 if (status < 0)
2520                         goto loop;
2521
2522                 /* consecutive bus-powered hubs aren't reliable; they can
2523                  * violate the voltage drop budget.  if the new child has
2524                  * a "powered" LED, users should notice we didn't enable it
2525                  * (without reading syslog), even without per-port LEDs
2526                  * on the parent.
2527                  */
2528                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2529                                 && hub->power_budget) {
2530                         u16     devstat;
2531
2532                         status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2533                                         &devstat);
2534                         if (status < 0) {
2535                                 dev_dbg(&udev->dev, "get status %d ?\n", status);
2536                                 goto loop_disable;
2537                         }
2538                         cpu_to_le16s(&devstat);
2539                         if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2540                                 dev_err(&udev->dev,
2541                                         "can't connect bus-powered hub "
2542                                         "to this port\n");
2543                                 if (hub->has_indicators) {
2544                                         hub->indicator[port1-1] =
2545                                                 INDICATOR_AMBER_BLINK;
2546                                         schedule_work (&hub->leds);
2547                                 }
2548                                 status = -ENOTCONN;     /* Don't retry */
2549                                 goto loop_disable;
2550                         }
2551                 }
2552  
2553                 /* check for devices running slower than they could */
2554                 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2555                                 && udev->speed == USB_SPEED_FULL
2556                                 && highspeed_hubs != 0)
2557                         check_highspeed (hub, udev, port1);
2558
2559                 /* Store the parent's children[] pointer.  At this point
2560                  * udev becomes globally accessible, although presumably
2561                  * no one will look at it until hdev is unlocked.
2562                  */
2563                 down (&udev->serialize);
2564                 status = 0;
2565
2566                 /* We mustn't add new devices if the parent hub has
2567                  * been disconnected; we would race with the
2568                  * recursively_mark_NOTATTACHED() routine.
2569                  */
2570                 spin_lock_irq(&device_state_lock);
2571                 if (hdev->state == USB_STATE_NOTATTACHED)
2572                         status = -ENOTCONN;
2573                 else
2574                         hdev->children[port1-1] = udev;
2575                 spin_unlock_irq(&device_state_lock);
2576
2577                 /* Run it through the hoops (find a driver, etc) */
2578                 if (!status) {
2579                         status = usb_new_device(udev);
2580                         if (status) {
2581                                 spin_lock_irq(&device_state_lock);
2582                                 hdev->children[port1-1] = NULL;
2583                                 spin_unlock_irq(&device_state_lock);
2584                         }
2585                 }
2586
2587                 up (&udev->serialize);
2588                 if (status)
2589                         goto loop_disable;
2590
2591                 status = hub_power_remaining(hub);
2592                 if (status)
2593                         dev_dbg(hub_dev,
2594                                 "%dmA power budget left\n",
2595                                 2 * status);
2596
2597                 return;
2598
2599 loop_disable:
2600                 hub_port_disable(hub, port1, 1);
2601 loop:
2602                 ep0_reinit(udev);
2603                 release_address(udev);
2604                 usb_put_dev(udev);
2605                 if (status == -ENOTCONN)
2606                         break;
2607         }
2608  
2609 done:
2610         hub_port_disable(hub, port1, 1);
2611 }
2612
2613 static void hub_events(void)
2614 {
2615         struct list_head *tmp;
2616         struct usb_device *hdev;
2617         struct usb_interface *intf;
2618         struct usb_hub *hub;
2619         struct device *hub_dev;
2620         u16 hubstatus;
2621         u16 hubchange;
2622         u16 portstatus;
2623         u16 portchange;
2624         int i, ret;
2625         int connect_change;
2626
2627         /*
2628          *  We restart the list every time to avoid a deadlock with
2629          * deleting hubs downstream from this one. This should be
2630          * safe since we delete the hub from the event list.
2631          * Not the most efficient, but avoids deadlocks.
2632          */
2633         while (1) {
2634
2635                 /* Grab the first entry at the beginning of the list */
2636                 spin_lock_irq(&hub_event_lock);
2637                 if (list_empty(&hub_event_list)) {
2638                         spin_unlock_irq(&hub_event_lock);
2639                         break;
2640                 }
2641
2642                 tmp = hub_event_list.next;
2643                 list_del_init(tmp);
2644
2645                 hub = list_entry(tmp, struct usb_hub, event_list);
2646                 hdev = hub->hdev;
2647                 intf = to_usb_interface(hub->intfdev);
2648                 hub_dev = &intf->dev;
2649
2650                 i = hub->resume_root_hub;
2651
2652                 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2653                                 hdev->state, hub->descriptor
2654                                         ? hub->descriptor->bNbrPorts
2655                                         : 0,
2656                                 /* NOTE: expects max 15 ports... */
2657                                 (u16) hub->change_bits[0],
2658                                 (u16) hub->event_bits[0],
2659                                 i ? ", resume root" : "");
2660
2661                 usb_get_intf(intf);
2662                 spin_unlock_irq(&hub_event_lock);
2663
2664                 /* Is this is a root hub wanting to reactivate the downstream
2665                  * ports?  If so, be sure the interface resumes even if its
2666                  * stub "device" node was never suspended.
2667                  */
2668                 if (i) {
2669                         extern void dpm_runtime_resume(struct device *);
2670
2671                         dpm_runtime_resume(&hdev->dev);
2672                         dpm_runtime_resume(&intf->dev);
2673                 }
2674
2675                 /* Lock the device, then check to see if we were
2676                  * disconnected while waiting for the lock to succeed. */
2677                 if (locktree(hdev) < 0) {
2678                         usb_put_intf(intf);
2679                         continue;
2680                 }
2681                 if (hub != usb_get_intfdata(intf))
2682                         goto loop;
2683
2684                 /* If the hub has died, clean up after it */
2685                 if (hdev->state == USB_STATE_NOTATTACHED) {
2686                         hub_pre_reset(hub);
2687                         goto loop;
2688                 }
2689
2690                 /* If this is an inactive or suspended hub, do nothing */
2691                 if (hub->quiescing)
2692                         goto loop;
2693
2694                 if (hub->error) {
2695                         dev_dbg (hub_dev, "resetting for error %d\n",
2696                                 hub->error);
2697
2698                         ret = usb_reset_device(hdev);
2699                         if (ret) {
2700                                 dev_dbg (hub_dev,
2701                                         "error resetting hub: %d\n", ret);
2702                                 goto loop;
2703                         }
2704
2705                         hub->nerrors = 0;
2706                         hub->error = 0;
2707                 }
2708
2709                 /* deal with port status changes */
2710                 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2711                         if (test_bit(i, hub->busy_bits))
2712                                 continue;
2713                         connect_change = test_bit(i, hub->change_bits);
2714                         if (!test_and_clear_bit(i, hub->event_bits) &&
2715                                         !connect_change && !hub->activating)
2716                                 continue;
2717
2718                         ret = hub_port_status(hub, i,
2719                                         &portstatus, &portchange);
2720                         if (ret < 0)
2721                                 continue;
2722
2723                         if (hub->activating && !hdev->children[i-1] &&
2724                                         (portstatus &
2725                                                 USB_PORT_STAT_CONNECTION))
2726                                 connect_change = 1;
2727
2728                         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2729                                 clear_port_feature(hdev, i,
2730                                         USB_PORT_FEAT_C_CONNECTION);
2731                                 connect_change = 1;
2732                         }
2733
2734                         if (portchange & USB_PORT_STAT_C_ENABLE) {
2735                                 if (!connect_change)
2736                                         dev_dbg (hub_dev,
2737                                                 "port %d enable change, "
2738                                                 "status %08x\n",
2739                                                 i, portstatus);
2740                                 clear_port_feature(hdev, i,
2741                                         USB_PORT_FEAT_C_ENABLE);
2742
2743                                 /*
2744                                  * EM interference sometimes causes badly
2745                                  * shielded USB devices to be shutdown by
2746                                  * the hub, this hack enables them again.
2747                                  * Works at least with mouse driver. 
2748                                  */
2749                                 if (!(portstatus & USB_PORT_STAT_ENABLE)
2750                                     && !connect_change
2751                                     && hdev->children[i-1]) {
2752                                         dev_err (hub_dev,
2753                                             "port %i "
2754                                             "disabled by hub (EMI?), "
2755                                             "re-enabling...\n",
2756                                                 i);
2757                                         connect_change = 1;
2758                                 }
2759                         }
2760
2761                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2762                                 clear_port_feature(hdev, i,
2763                                         USB_PORT_FEAT_C_SUSPEND);
2764                                 if (hdev->children[i-1]) {
2765                                         ret = remote_wakeup(hdev->
2766                                                         children[i-1]);
2767                                         if (ret < 0)
2768                                                 connect_change = 1;
2769                                 } else {
2770                                         ret = -ENODEV;
2771                                         hub_port_disable(hub, i, 1);
2772                                 }
2773                                 dev_dbg (hub_dev,
2774                                         "resume on port %d, status %d\n",
2775                                         i, ret);
2776                         }
2777                         
2778                         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2779                                 dev_err (hub_dev,
2780                                         "over-current change on port %d\n",
2781                                         i);
2782                                 clear_port_feature(hdev, i,
2783                                         USB_PORT_FEAT_C_OVER_CURRENT);
2784                                 hub_power_on(hub);
2785                         }
2786
2787                         if (portchange & USB_PORT_STAT_C_RESET) {
2788                                 dev_dbg (hub_dev,
2789                                         "reset change on port %d\n",
2790                                         i);
2791                                 clear_port_feature(hdev, i,
2792                                         USB_PORT_FEAT_C_RESET);
2793                         }
2794
2795                         if (connect_change)
2796                                 hub_port_connect_change(hub, i,
2797                                                 portstatus, portchange);
2798                 } /* end for i */
2799
2800                 /* deal with hub status changes */
2801                 if (test_and_clear_bit(0, hub->event_bits) == 0)
2802                         ;       /* do nothing */
2803                 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2804                         dev_err (hub_dev, "get_hub_status failed\n");
2805                 else {
2806                         if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2807                                 dev_dbg (hub_dev, "power change\n");
2808                                 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2809                         }
2810                         if (hubchange & HUB_CHANGE_OVERCURRENT) {
2811                                 dev_dbg (hub_dev, "overcurrent change\n");
2812                                 msleep(500);    /* Cool down */
2813                                 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2814                                 hub_power_on(hub);
2815                         }
2816                 }
2817
2818                 hub->activating = 0;
2819
2820                 /* If this is a root hub, tell the HCD it's okay to
2821                  * re-enable port-change interrupts now. */
2822                 if (!hdev->parent)
2823                         usb_enable_root_hub_irq(hdev->bus);
2824
2825 loop:
2826                 usb_unlock_device(hdev);
2827                 usb_put_intf(intf);
2828
2829         } /* end while (1) */
2830 }
2831
2832 static int hub_thread(void *__unused)
2833 {
2834         do {
2835                 hub_events();
2836                 wait_event_interruptible(khubd_wait,
2837                                 !list_empty(&hub_event_list) ||
2838                                 kthread_should_stop());
2839                 try_to_freeze();
2840         } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2841
2842         pr_debug("%s: khubd exiting\n", usbcore_name);
2843         return 0;
2844 }
2845
2846 static struct usb_device_id hub_id_table [] = {
2847     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2848       .bDeviceClass = USB_CLASS_HUB},
2849     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2850       .bInterfaceClass = USB_CLASS_HUB},
2851     { }                                         /* Terminating entry */
2852 };
2853
2854 MODULE_DEVICE_TABLE (usb, hub_id_table);
2855
2856 static struct usb_driver hub_driver = {
2857         .owner =        THIS_MODULE,
2858         .name =         "hub",
2859         .probe =        hub_probe,
2860         .disconnect =   hub_disconnect,
2861         .suspend =      hub_suspend,
2862         .resume =       hub_resume,
2863         .ioctl =        hub_ioctl,
2864         .id_table =     hub_id_table,
2865 };
2866
2867 int usb_hub_init(void)
2868 {
2869         if (usb_register(&hub_driver) < 0) {
2870                 printk(KERN_ERR "%s: can't register hub driver\n",
2871                         usbcore_name);
2872                 return -1;
2873         }
2874
2875         khubd_task = kthread_run(hub_thread, NULL, "khubd");
2876         if (!IS_ERR(khubd_task))
2877                 return 0;
2878
2879         /* Fall through if kernel_thread failed */
2880         usb_deregister(&hub_driver);
2881         printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2882
2883         return -1;
2884 }
2885
2886 void usb_hub_cleanup(void)
2887 {
2888         kthread_stop(khubd_task);
2889
2890         /*
2891          * Hub resources are freed for us by usb_deregister. It calls
2892          * usb_driver_purge on every device which in turn calls that
2893          * devices disconnect function if it is using this driver.
2894          * The hub_disconnect function takes care of releasing the
2895          * individual hub resources. -greg
2896          */
2897         usb_deregister(&hub_driver);
2898 } /* usb_hub_cleanup() */
2899
2900 static int config_descriptors_changed(struct usb_device *udev)
2901 {
2902         unsigned                        index;
2903         unsigned                        len = 0;
2904         struct usb_config_descriptor    *buf;
2905
2906         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2907                 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2908                         len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2909         }
2910         buf = kmalloc (len, SLAB_KERNEL);
2911         if (buf == NULL) {
2912                 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2913                 /* assume the worst */
2914                 return 1;
2915         }
2916         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2917                 int length;
2918                 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2919
2920                 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2921                                 old_length);
2922                 if (length < old_length) {
2923                         dev_dbg(&udev->dev, "config index %d, error %d\n",
2924                                         index, length);
2925                         break;
2926                 }
2927                 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2928                                 != 0) {
2929                         dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2930                                 index, buf->bConfigurationValue);
2931                         break;
2932                 }
2933         }
2934         kfree(buf);
2935         return index != udev->descriptor.bNumConfigurations;
2936 }
2937
2938 /**
2939  * usb_reset_device - perform a USB port reset to reinitialize a device
2940  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2941  *
2942  * WARNING - don't reset any device unless drivers for all of its
2943  * interfaces are expecting that reset!  Maybe some driver->reset()
2944  * method should eventually help ensure sufficient cooperation.
2945  *
2946  * Do a port reset, reassign the device's address, and establish its
2947  * former operating configuration.  If the reset fails, or the device's
2948  * descriptors change from their values before the reset, or the original
2949  * configuration and altsettings cannot be restored, a flag will be set
2950  * telling khubd to pretend the device has been disconnected and then
2951  * re-connected.  All drivers will be unbound, and the device will be
2952  * re-enumerated and probed all over again.
2953  *
2954  * Returns 0 if the reset succeeded, -ENODEV if the device has been
2955  * flagged for logical disconnection, or some other negative error code
2956  * if the reset wasn't even attempted.
2957  *
2958  * The caller must own the device lock.  For example, it's safe to use
2959  * this from a driver probe() routine after downloading new firmware.
2960  * For calls that might not occur during probe(), drivers should lock
2961  * the device using usb_lock_device_for_reset().
2962  */
2963 int usb_reset_device(struct usb_device *udev)
2964 {
2965         struct usb_device               *parent_hdev = udev->parent;
2966         struct usb_hub                  *parent_hub;
2967         struct usb_device_descriptor    descriptor = udev->descriptor;
2968         struct usb_hub                  *hub = NULL;
2969         int                             i, ret = 0, port1 = -1;
2970
2971         if (udev->state == USB_STATE_NOTATTACHED ||
2972                         udev->state == USB_STATE_SUSPENDED) {
2973                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2974                                 udev->state);
2975                 return -EINVAL;
2976         }
2977
2978         if (!parent_hdev) {
2979                 /* this requires hcd-specific logic; see OHCI hc_restart() */
2980                 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2981                 return -EISDIR;
2982         }
2983
2984         for (i = 0; i < parent_hdev->maxchild; i++)
2985                 if (parent_hdev->children[i] == udev) {
2986                         port1 = i + 1;
2987                         break;
2988                 }
2989
2990         if (port1 < 0) {
2991                 /* If this ever happens, it's very bad */
2992                 dev_err(&udev->dev, "Can't locate device's port!\n");
2993                 return -ENOENT;
2994         }
2995         parent_hub = hdev_to_hub(parent_hdev);
2996
2997         /* If we're resetting an active hub, take some special actions */
2998         if (udev->actconfig &&
2999                         udev->actconfig->interface[0]->dev.driver ==
3000                                 &hub_driver.driver &&
3001                         (hub = hdev_to_hub(udev)) != NULL) {
3002                 hub_pre_reset(hub);
3003         }
3004
3005         set_bit(port1, parent_hub->busy_bits);
3006         for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3007
3008                 /* ep0 maxpacket size may change; let the HCD know about it.
3009                  * Other endpoints will be handled by re-enumeration. */
3010                 ep0_reinit(udev);
3011                 ret = hub_port_init(parent_hub, udev, port1, i);
3012                 if (ret >= 0)
3013                         break;
3014         }
3015         clear_bit(port1, parent_hub->busy_bits);
3016         if (ret < 0)
3017                 goto re_enumerate;
3018  
3019         /* Device might have changed firmware (DFU or similar) */
3020         if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3021                         || config_descriptors_changed (udev)) {
3022                 dev_info(&udev->dev, "device firmware changed\n");
3023                 udev->descriptor = descriptor;  /* for disconnect() calls */
3024                 goto re_enumerate;
3025         }
3026   
3027         if (!udev->actconfig)
3028                 goto done;
3029
3030         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3031                         USB_REQ_SET_CONFIGURATION, 0,
3032                         udev->actconfig->desc.bConfigurationValue, 0,
3033                         NULL, 0, USB_CTRL_SET_TIMEOUT);
3034         if (ret < 0) {
3035                 dev_err(&udev->dev,
3036                         "can't restore configuration #%d (error=%d)\n",
3037                         udev->actconfig->desc.bConfigurationValue, ret);
3038                 goto re_enumerate;
3039         }
3040         usb_set_device_state(udev, USB_STATE_CONFIGURED);
3041
3042         for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3043                 struct usb_interface *intf = udev->actconfig->interface[i];
3044                 struct usb_interface_descriptor *desc;
3045
3046                 /* set_interface resets host side toggle even
3047                  * for altsetting zero.  the interface may have no driver.
3048                  */
3049                 desc = &intf->cur_altsetting->desc;
3050                 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3051                         desc->bAlternateSetting);
3052                 if (ret < 0) {
3053                         dev_err(&udev->dev, "failed to restore interface %d "
3054                                 "altsetting %d (error=%d)\n",
3055                                 desc->bInterfaceNumber,
3056                                 desc->bAlternateSetting,
3057                                 ret);
3058                         goto re_enumerate;
3059                 }
3060         }
3061
3062 done:
3063         if (hub)
3064                 hub_post_reset(hub);
3065         return 0;
3066  
3067 re_enumerate:
3068         hub_port_logical_disconnect(parent_hub, port1);
3069         return -ENODEV;
3070 }