Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/usb-2.6
[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/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
25
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
29
30 #include "usb.h"
31 #include "hcd.h"
32 #include "hub.h"
33
34 #ifdef  CONFIG_USB_PERSIST
35 #define USB_PERSIST     1
36 #else
37 #define USB_PERSIST     0
38 #endif
39
40 struct usb_hub {
41         struct device           *intfdev;       /* the "interface" device */
42         struct usb_device       *hdev;
43         struct kref             kref;
44         struct urb              *urb;           /* for interrupt polling pipe */
45
46         /* buffer for urb ... with extra space in case of babble */
47         char                    (*buffer)[8];
48         dma_addr_t              buffer_dma;     /* DMA address for buffer */
49         union {
50                 struct usb_hub_status   hub;
51                 struct usb_port_status  port;
52         }                       *status;        /* buffer for status reports */
53         struct mutex            status_mutex;   /* for the status buffer */
54
55         int                     error;          /* last reported error */
56         int                     nerrors;        /* track consecutive errors */
57
58         struct list_head        event_list;     /* hubs w/data or errs ready */
59         unsigned long           event_bits[1];  /* status change bitmask */
60         unsigned long           change_bits[1]; /* ports with logical connect
61                                                         status change */
62         unsigned long           busy_bits[1];   /* ports being reset or
63                                                         resumed */
64 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65 #error event_bits[] is too short!
66 #endif
67
68         struct usb_hub_descriptor *descriptor;  /* class descriptor */
69         struct usb_tt           tt;             /* Transaction Translator */
70
71         unsigned                mA_per_port;    /* current for each child */
72
73         unsigned                limited_power:1;
74         unsigned                quiescing:1;
75         unsigned                activating:1;
76         unsigned                disconnected:1;
77
78         unsigned                has_indicators:1;
79         u8                      indicator[USB_MAXCHILDREN];
80         struct delayed_work     leds;
81 };
82
83
84 /* Protect struct usb_device->state and ->children members
85  * Note: Both are also protected by ->dev.sem, except that ->state can
86  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
87 static DEFINE_SPINLOCK(device_state_lock);
88
89 /* khubd's worklist and its lock */
90 static DEFINE_SPINLOCK(hub_event_lock);
91 static LIST_HEAD(hub_event_list);       /* List of hubs needing servicing */
92
93 /* Wakes up khubd */
94 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
95
96 static struct task_struct *khubd_task;
97
98 /* cycle leds on hubs that aren't blinking for attention */
99 static int blinkenlights = 0;
100 module_param (blinkenlights, bool, S_IRUGO);
101 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
102
103 /*
104  * As of 2.6.10 we introduce a new USB device initialization scheme which
105  * closely resembles the way Windows works.  Hopefully it will be compatible
106  * with a wider range of devices than the old scheme.  However some previously
107  * working devices may start giving rise to "device not accepting address"
108  * errors; if that happens the user can try the old scheme by adjusting the
109  * following module parameters.
110  *
111  * For maximum flexibility there are two boolean parameters to control the
112  * hub driver's behavior.  On the first initialization attempt, if the
113  * "old_scheme_first" parameter is set then the old scheme will be used,
114  * otherwise the new scheme is used.  If that fails and "use_both_schemes"
115  * is set, then the driver will make another attempt, using the other scheme.
116  */
117 static int old_scheme_first = 0;
118 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
119 MODULE_PARM_DESC(old_scheme_first,
120                  "start with the old device initialization scheme");
121
122 static int use_both_schemes = 1;
123 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
124 MODULE_PARM_DESC(use_both_schemes,
125                 "try the other device initialization scheme if the "
126                 "first one fails");
127
128 /* Mutual exclusion for EHCI CF initialization.  This interferes with
129  * port reset on some companion controllers.
130  */
131 DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
132 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
133
134
135 static inline char *portspeed(int portstatus)
136 {
137         if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
138                 return "480 Mb/s";
139         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
140                 return "1.5 Mb/s";
141         else
142                 return "12 Mb/s";
143 }
144
145 /* Note that hdev or one of its children must be locked! */
146 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
147 {
148         return usb_get_intfdata(hdev->actconfig->interface[0]);
149 }
150
151 /* USB 2.0 spec Section 11.24.4.5 */
152 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
153 {
154         int i, ret;
155
156         for (i = 0; i < 3; i++) {
157                 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
158                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
159                         USB_DT_HUB << 8, 0, data, size,
160                         USB_CTRL_GET_TIMEOUT);
161                 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
162                         return ret;
163         }
164         return -EINVAL;
165 }
166
167 /*
168  * USB 2.0 spec Section 11.24.2.1
169  */
170 static int clear_hub_feature(struct usb_device *hdev, int feature)
171 {
172         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
173                 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
174 }
175
176 /*
177  * USB 2.0 spec Section 11.24.2.2
178  */
179 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
180 {
181         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
182                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
183                 NULL, 0, 1000);
184 }
185
186 /*
187  * USB 2.0 spec Section 11.24.2.13
188  */
189 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
190 {
191         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
192                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
193                 NULL, 0, 1000);
194 }
195
196 /*
197  * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
198  * for info about using port indicators
199  */
200 static void set_port_led(
201         struct usb_hub *hub,
202         int port1,
203         int selector
204 )
205 {
206         int status = set_port_feature(hub->hdev, (selector << 8) | port1,
207                         USB_PORT_FEAT_INDICATOR);
208         if (status < 0)
209                 dev_dbg (hub->intfdev,
210                         "port %d indicator %s status %d\n",
211                         port1,
212                         ({ char *s; switch (selector) {
213                         case HUB_LED_AMBER: s = "amber"; break;
214                         case HUB_LED_GREEN: s = "green"; break;
215                         case HUB_LED_OFF: s = "off"; break;
216                         case HUB_LED_AUTO: s = "auto"; break;
217                         default: s = "??"; break;
218                         }; s; }),
219                         status);
220 }
221
222 #define LED_CYCLE_PERIOD        ((2*HZ)/3)
223
224 static void led_work (struct work_struct *work)
225 {
226         struct usb_hub          *hub =
227                 container_of(work, struct usb_hub, leds.work);
228         struct usb_device       *hdev = hub->hdev;
229         unsigned                i;
230         unsigned                changed = 0;
231         int                     cursor = -1;
232
233         if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
234                 return;
235
236         for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
237                 unsigned        selector, mode;
238
239                 /* 30%-50% duty cycle */
240
241                 switch (hub->indicator[i]) {
242                 /* cycle marker */
243                 case INDICATOR_CYCLE:
244                         cursor = i;
245                         selector = HUB_LED_AUTO;
246                         mode = INDICATOR_AUTO;
247                         break;
248                 /* blinking green = sw attention */
249                 case INDICATOR_GREEN_BLINK:
250                         selector = HUB_LED_GREEN;
251                         mode = INDICATOR_GREEN_BLINK_OFF;
252                         break;
253                 case INDICATOR_GREEN_BLINK_OFF:
254                         selector = HUB_LED_OFF;
255                         mode = INDICATOR_GREEN_BLINK;
256                         break;
257                 /* blinking amber = hw attention */
258                 case INDICATOR_AMBER_BLINK:
259                         selector = HUB_LED_AMBER;
260                         mode = INDICATOR_AMBER_BLINK_OFF;
261                         break;
262                 case INDICATOR_AMBER_BLINK_OFF:
263                         selector = HUB_LED_OFF;
264                         mode = INDICATOR_AMBER_BLINK;
265                         break;
266                 /* blink green/amber = reserved */
267                 case INDICATOR_ALT_BLINK:
268                         selector = HUB_LED_GREEN;
269                         mode = INDICATOR_ALT_BLINK_OFF;
270                         break;
271                 case INDICATOR_ALT_BLINK_OFF:
272                         selector = HUB_LED_AMBER;
273                         mode = INDICATOR_ALT_BLINK;
274                         break;
275                 default:
276                         continue;
277                 }
278                 if (selector != HUB_LED_AUTO)
279                         changed = 1;
280                 set_port_led(hub, i + 1, selector);
281                 hub->indicator[i] = mode;
282         }
283         if (!changed && blinkenlights) {
284                 cursor++;
285                 cursor %= hub->descriptor->bNbrPorts;
286                 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
287                 hub->indicator[cursor] = INDICATOR_CYCLE;
288                 changed++;
289         }
290         if (changed)
291                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
292 }
293
294 /* use a short timeout for hub/port status fetches */
295 #define USB_STS_TIMEOUT         1000
296 #define USB_STS_RETRIES         5
297
298 /*
299  * USB 2.0 spec Section 11.24.2.6
300  */
301 static int get_hub_status(struct usb_device *hdev,
302                 struct usb_hub_status *data)
303 {
304         int i, status = -ETIMEDOUT;
305
306         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
307                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
308                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
309                         data, sizeof(*data), USB_STS_TIMEOUT);
310         }
311         return status;
312 }
313
314 /*
315  * USB 2.0 spec Section 11.24.2.7
316  */
317 static int get_port_status(struct usb_device *hdev, int port1,
318                 struct usb_port_status *data)
319 {
320         int i, status = -ETIMEDOUT;
321
322         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
323                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
324                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
325                         data, sizeof(*data), USB_STS_TIMEOUT);
326         }
327         return status;
328 }
329
330 static void kick_khubd(struct usb_hub *hub)
331 {
332         unsigned long   flags;
333
334         /* Suppress autosuspend until khubd runs */
335         to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
336
337         spin_lock_irqsave(&hub_event_lock, flags);
338         if (!hub->disconnected & list_empty(&hub->event_list)) {
339                 list_add_tail(&hub->event_list, &hub_event_list);
340                 wake_up(&khubd_wait);
341         }
342         spin_unlock_irqrestore(&hub_event_lock, flags);
343 }
344
345 void usb_kick_khubd(struct usb_device *hdev)
346 {
347         /* FIXME: What if hdev isn't bound to the hub driver? */
348         kick_khubd(hdev_to_hub(hdev));
349 }
350
351
352 /* completion function, fires on port status changes and various faults */
353 static void hub_irq(struct urb *urb)
354 {
355         struct usb_hub *hub = urb->context;
356         int status = urb->status;
357         int i;
358         unsigned long bits;
359
360         switch (status) {
361         case -ENOENT:           /* synchronous unlink */
362         case -ECONNRESET:       /* async unlink */
363         case -ESHUTDOWN:        /* hardware going away */
364                 return;
365
366         default:                /* presumably an error */
367                 /* Cause a hub reset after 10 consecutive errors */
368                 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
369                 if ((++hub->nerrors < 10) || hub->error)
370                         goto resubmit;
371                 hub->error = status;
372                 /* FALL THROUGH */
373
374         /* let khubd handle things */
375         case 0:                 /* we got data:  port status changed */
376                 bits = 0;
377                 for (i = 0; i < urb->actual_length; ++i)
378                         bits |= ((unsigned long) ((*hub->buffer)[i]))
379                                         << (i*8);
380                 hub->event_bits[0] = bits;
381                 break;
382         }
383
384         hub->nerrors = 0;
385
386         /* Something happened, let khubd figure it out */
387         kick_khubd(hub);
388
389 resubmit:
390         if (hub->quiescing)
391                 return;
392
393         if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
394                         && status != -ENODEV && status != -EPERM)
395                 dev_err (hub->intfdev, "resubmit --> %d\n", status);
396 }
397
398 /* USB 2.0 spec Section 11.24.2.3 */
399 static inline int
400 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
401 {
402         return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
403                                HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
404                                tt, NULL, 0, 1000);
405 }
406
407 /*
408  * enumeration blocks khubd for a long time. we use keventd instead, since
409  * long blocking there is the exception, not the rule.  accordingly, HCDs
410  * talking to TTs must queue control transfers (not just bulk and iso), so
411  * both can talk to the same hub concurrently.
412  */
413 static void hub_tt_kevent (struct work_struct *work)
414 {
415         struct usb_hub          *hub =
416                 container_of(work, struct usb_hub, tt.kevent);
417         unsigned long           flags;
418         int                     limit = 100;
419
420         spin_lock_irqsave (&hub->tt.lock, flags);
421         while (--limit && !list_empty (&hub->tt.clear_list)) {
422                 struct list_head        *temp;
423                 struct usb_tt_clear     *clear;
424                 struct usb_device       *hdev = hub->hdev;
425                 int                     status;
426
427                 temp = hub->tt.clear_list.next;
428                 clear = list_entry (temp, struct usb_tt_clear, clear_list);
429                 list_del (&clear->clear_list);
430
431                 /* drop lock so HCD can concurrently report other TT errors */
432                 spin_unlock_irqrestore (&hub->tt.lock, flags);
433                 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
434                 spin_lock_irqsave (&hub->tt.lock, flags);
435
436                 if (status)
437                         dev_err (&hdev->dev,
438                                 "clear tt %d (%04x) error %d\n",
439                                 clear->tt, clear->devinfo, status);
440                 kfree(clear);
441         }
442         spin_unlock_irqrestore (&hub->tt.lock, flags);
443 }
444
445 /**
446  * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
447  * @udev: the device whose split transaction failed
448  * @pipe: identifies the endpoint of the failed transaction
449  *
450  * High speed HCDs use this to tell the hub driver that some split control or
451  * bulk transaction failed in a way that requires clearing internal state of
452  * a transaction translator.  This is normally detected (and reported) from
453  * interrupt context.
454  *
455  * It may not be possible for that hub to handle additional full (or low)
456  * speed transactions until that state is fully cleared out.
457  */
458 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
459 {
460         struct usb_tt           *tt = udev->tt;
461         unsigned long           flags;
462         struct usb_tt_clear     *clear;
463
464         /* we've got to cope with an arbitrary number of pending TT clears,
465          * since each TT has "at least two" buffers that can need it (and
466          * there can be many TTs per hub).  even if they're uncommon.
467          */
468         if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
469                 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
470                 /* FIXME recover somehow ... RESET_TT? */
471                 return;
472         }
473
474         /* info that CLEAR_TT_BUFFER needs */
475         clear->tt = tt->multi ? udev->ttport : 1;
476         clear->devinfo = usb_pipeendpoint (pipe);
477         clear->devinfo |= udev->devnum << 4;
478         clear->devinfo |= usb_pipecontrol (pipe)
479                         ? (USB_ENDPOINT_XFER_CONTROL << 11)
480                         : (USB_ENDPOINT_XFER_BULK << 11);
481         if (usb_pipein (pipe))
482                 clear->devinfo |= 1 << 15;
483         
484         /* tell keventd to clear state for this TT */
485         spin_lock_irqsave (&tt->lock, flags);
486         list_add_tail (&clear->clear_list, &tt->clear_list);
487         schedule_work (&tt->kevent);
488         spin_unlock_irqrestore (&tt->lock, flags);
489 }
490
491 static void hub_power_on(struct usb_hub *hub)
492 {
493         int port1;
494         unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
495         u16 wHubCharacteristics =
496                         le16_to_cpu(hub->descriptor->wHubCharacteristics);
497
498         /* Enable power on each port.  Some hubs have reserved values
499          * of LPSM (> 2) in their descriptors, even though they are
500          * USB 2.0 hubs.  Some hubs do not implement port-power switching
501          * but only emulate it.  In all cases, the ports won't work
502          * unless we send these messages to the hub.
503          */
504         if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
505                 dev_dbg(hub->intfdev, "enabling power on all ports\n");
506         else
507                 dev_dbg(hub->intfdev, "trying to enable port power on "
508                                 "non-switchable hub\n");
509         for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
510                 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
511
512         /* Wait at least 100 msec for power to become stable */
513         msleep(max(pgood_delay, (unsigned) 100));
514 }
515
516 static void hub_quiesce(struct usb_hub *hub)
517 {
518         /* (nonblocking) khubd and related activity won't re-trigger */
519         hub->quiescing = 1;
520         hub->activating = 0;
521
522         /* (blocking) stop khubd and related activity */
523         usb_kill_urb(hub->urb);
524         if (hub->has_indicators)
525                 cancel_delayed_work(&hub->leds);
526         if (hub->has_indicators || hub->tt.hub)
527                 flush_scheduled_work();
528 }
529
530 static void hub_activate(struct usb_hub *hub)
531 {
532         int     status;
533
534         hub->quiescing = 0;
535         hub->activating = 1;
536
537         status = usb_submit_urb(hub->urb, GFP_NOIO);
538         if (status < 0)
539                 dev_err(hub->intfdev, "activate --> %d\n", status);
540         if (hub->has_indicators && blinkenlights)
541                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
542
543         /* scan all ports ASAP */
544         kick_khubd(hub);
545 }
546
547 static int hub_hub_status(struct usb_hub *hub,
548                 u16 *status, u16 *change)
549 {
550         int ret;
551
552         mutex_lock(&hub->status_mutex);
553         ret = get_hub_status(hub->hdev, &hub->status->hub);
554         if (ret < 0)
555                 dev_err (hub->intfdev,
556                         "%s failed (err = %d)\n", __FUNCTION__, ret);
557         else {
558                 *status = le16_to_cpu(hub->status->hub.wHubStatus);
559                 *change = le16_to_cpu(hub->status->hub.wHubChange); 
560                 ret = 0;
561         }
562         mutex_unlock(&hub->status_mutex);
563         return ret;
564 }
565
566 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
567 {
568         struct usb_device *hdev = hub->hdev;
569         int ret = 0;
570
571         if (hdev->children[port1-1] && set_state)
572                 usb_set_device_state(hdev->children[port1-1],
573                                 USB_STATE_NOTATTACHED);
574         if (!hub->error)
575                 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
576         if (ret)
577                 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
578                                 port1, ret);
579         return ret;
580 }
581
582 /*
583  * Disable a port and mark a logical connnect-change event, so that some
584  * time later khubd will disconnect() any existing usb_device on the port
585  * and will re-enumerate if there actually is a device attached.
586  */
587 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
588 {
589         dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
590         hub_port_disable(hub, port1, 1);
591
592         /* FIXME let caller ask to power down the port:
593          *  - some devices won't enumerate without a VBUS power cycle
594          *  - SRP saves power that way
595          *  - ... new call, TBD ...
596          * That's easy if this hub can switch power per-port, and
597          * khubd reactivates the port later (timer, SRP, etc).
598          * Powerdown must be optional, because of reset/DFU.
599          */
600
601         set_bit(port1, hub->change_bits);
602         kick_khubd(hub);
603 }
604
605 /* caller has locked the hub device */
606 static int hub_pre_reset(struct usb_interface *intf)
607 {
608         struct usb_hub *hub = usb_get_intfdata(intf);
609         struct usb_device *hdev = hub->hdev;
610         int i;
611
612         /* Disconnect all the children */
613         for (i = 0; i < hdev->maxchild; ++i) {
614                 if (hdev->children[i])
615                         usb_disconnect(&hdev->children[i]);
616         }
617         hub_quiesce(hub);
618         return 0;
619 }
620
621 /* caller has locked the hub device */
622 static int hub_post_reset(struct usb_interface *intf)
623 {
624         struct usb_hub *hub = usb_get_intfdata(intf);
625
626         hub_power_on(hub);
627         hub_activate(hub);
628         return 0;
629 }
630
631 static int hub_configure(struct usb_hub *hub,
632         struct usb_endpoint_descriptor *endpoint)
633 {
634         struct usb_device *hdev = hub->hdev;
635         struct device *hub_dev = hub->intfdev;
636         u16 hubstatus, hubchange;
637         u16 wHubCharacteristics;
638         unsigned int pipe;
639         int maxp, ret;
640         char *message;
641
642         hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
643                         &hub->buffer_dma);
644         if (!hub->buffer) {
645                 message = "can't allocate hub irq buffer";
646                 ret = -ENOMEM;
647                 goto fail;
648         }
649
650         hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
651         if (!hub->status) {
652                 message = "can't kmalloc hub status buffer";
653                 ret = -ENOMEM;
654                 goto fail;
655         }
656         mutex_init(&hub->status_mutex);
657
658         hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
659         if (!hub->descriptor) {
660                 message = "can't kmalloc hub descriptor";
661                 ret = -ENOMEM;
662                 goto fail;
663         }
664
665         /* Request the entire hub descriptor.
666          * hub->descriptor can handle USB_MAXCHILDREN ports,
667          * but the hub can/will return fewer bytes here.
668          */
669         ret = get_hub_descriptor(hdev, hub->descriptor,
670                         sizeof(*hub->descriptor));
671         if (ret < 0) {
672                 message = "can't read hub descriptor";
673                 goto fail;
674         } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
675                 message = "hub has too many ports!";
676                 ret = -ENODEV;
677                 goto fail;
678         }
679
680         hdev->maxchild = hub->descriptor->bNbrPorts;
681         dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
682                 (hdev->maxchild == 1) ? "" : "s");
683
684         wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
685
686         if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
687                 int     i;
688                 char    portstr [USB_MAXCHILDREN + 1];
689
690                 for (i = 0; i < hdev->maxchild; i++)
691                         portstr[i] = hub->descriptor->DeviceRemovable
692                                     [((i + 1) / 8)] & (1 << ((i + 1) % 8))
693                                 ? 'F' : 'R';
694                 portstr[hdev->maxchild] = 0;
695                 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
696         } else
697                 dev_dbg(hub_dev, "standalone hub\n");
698
699         switch (wHubCharacteristics & HUB_CHAR_LPSM) {
700                 case 0x00:
701                         dev_dbg(hub_dev, "ganged power switching\n");
702                         break;
703                 case 0x01:
704                         dev_dbg(hub_dev, "individual port power switching\n");
705                         break;
706                 case 0x02:
707                 case 0x03:
708                         dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
709                         break;
710         }
711
712         switch (wHubCharacteristics & HUB_CHAR_OCPM) {
713                 case 0x00:
714                         dev_dbg(hub_dev, "global over-current protection\n");
715                         break;
716                 case 0x08:
717                         dev_dbg(hub_dev, "individual port over-current protection\n");
718                         break;
719                 case 0x10:
720                 case 0x18:
721                         dev_dbg(hub_dev, "no over-current protection\n");
722                         break;
723         }
724
725         spin_lock_init (&hub->tt.lock);
726         INIT_LIST_HEAD (&hub->tt.clear_list);
727         INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
728         switch (hdev->descriptor.bDeviceProtocol) {
729                 case 0:
730                         break;
731                 case 1:
732                         dev_dbg(hub_dev, "Single TT\n");
733                         hub->tt.hub = hdev;
734                         break;
735                 case 2:
736                         ret = usb_set_interface(hdev, 0, 1);
737                         if (ret == 0) {
738                                 dev_dbg(hub_dev, "TT per port\n");
739                                 hub->tt.multi = 1;
740                         } else
741                                 dev_err(hub_dev, "Using single TT (err %d)\n",
742                                         ret);
743                         hub->tt.hub = hdev;
744                         break;
745                 default:
746                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
747                                 hdev->descriptor.bDeviceProtocol);
748                         break;
749         }
750
751         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
752         switch (wHubCharacteristics & HUB_CHAR_TTTT) {
753                 case HUB_TTTT_8_BITS:
754                         if (hdev->descriptor.bDeviceProtocol != 0) {
755                                 hub->tt.think_time = 666;
756                                 dev_dbg(hub_dev, "TT requires at most %d "
757                                                 "FS bit times (%d ns)\n",
758                                         8, hub->tt.think_time);
759                         }
760                         break;
761                 case HUB_TTTT_16_BITS:
762                         hub->tt.think_time = 666 * 2;
763                         dev_dbg(hub_dev, "TT requires at most %d "
764                                         "FS bit times (%d ns)\n",
765                                 16, hub->tt.think_time);
766                         break;
767                 case HUB_TTTT_24_BITS:
768                         hub->tt.think_time = 666 * 3;
769                         dev_dbg(hub_dev, "TT requires at most %d "
770                                         "FS bit times (%d ns)\n",
771                                 24, hub->tt.think_time);
772                         break;
773                 case HUB_TTTT_32_BITS:
774                         hub->tt.think_time = 666 * 4;
775                         dev_dbg(hub_dev, "TT requires at most %d "
776                                         "FS bit times (%d ns)\n",
777                                 32, hub->tt.think_time);
778                         break;
779         }
780
781         /* probe() zeroes hub->indicator[] */
782         if (wHubCharacteristics & HUB_CHAR_PORTIND) {
783                 hub->has_indicators = 1;
784                 dev_dbg(hub_dev, "Port indicators are supported\n");
785         }
786
787         dev_dbg(hub_dev, "power on to power good time: %dms\n",
788                 hub->descriptor->bPwrOn2PwrGood * 2);
789
790         /* power budgeting mostly matters with bus-powered hubs,
791          * and battery-powered root hubs (may provide just 8 mA).
792          */
793         ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
794         if (ret < 2) {
795                 message = "can't get hub status";
796                 goto fail;
797         }
798         le16_to_cpus(&hubstatus);
799         if (hdev == hdev->bus->root_hub) {
800                 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
801                         hub->mA_per_port = 500;
802                 else {
803                         hub->mA_per_port = hdev->bus_mA;
804                         hub->limited_power = 1;
805                 }
806         } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
807                 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
808                         hub->descriptor->bHubContrCurrent);
809                 hub->limited_power = 1;
810                 if (hdev->maxchild > 0) {
811                         int remaining = hdev->bus_mA -
812                                         hub->descriptor->bHubContrCurrent;
813
814                         if (remaining < hdev->maxchild * 100)
815                                 dev_warn(hub_dev,
816                                         "insufficient power available "
817                                         "to use all downstream ports\n");
818                         hub->mA_per_port = 100;         /* 7.2.1.1 */
819                 }
820         } else {        /* Self-powered external hub */
821                 /* FIXME: What about battery-powered external hubs that
822                  * provide less current per port? */
823                 hub->mA_per_port = 500;
824         }
825         if (hub->mA_per_port < 500)
826                 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
827                                 hub->mA_per_port);
828
829         ret = hub_hub_status(hub, &hubstatus, &hubchange);
830         if (ret < 0) {
831                 message = "can't get hub status";
832                 goto fail;
833         }
834
835         /* local power status reports aren't always correct */
836         if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
837                 dev_dbg(hub_dev, "local power source is %s\n",
838                         (hubstatus & HUB_STATUS_LOCAL_POWER)
839                         ? "lost (inactive)" : "good");
840
841         if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
842                 dev_dbg(hub_dev, "%sover-current condition exists\n",
843                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
844
845         /* set up the interrupt endpoint
846          * We use the EP's maxpacket size instead of (PORTS+1+7)/8
847          * bytes as USB2.0[11.12.3] says because some hubs are known
848          * to send more data (and thus cause overflow). For root hubs,
849          * maxpktsize is defined in hcd.c's fake endpoint descriptors
850          * to be big enough for at least USB_MAXCHILDREN ports. */
851         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
852         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
853
854         if (maxp > sizeof(*hub->buffer))
855                 maxp = sizeof(*hub->buffer);
856
857         hub->urb = usb_alloc_urb(0, GFP_KERNEL);
858         if (!hub->urb) {
859                 message = "couldn't allocate interrupt urb";
860                 ret = -ENOMEM;
861                 goto fail;
862         }
863
864         usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
865                 hub, endpoint->bInterval);
866         hub->urb->transfer_dma = hub->buffer_dma;
867         hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
868
869         /* maybe cycle the hub leds */
870         if (hub->has_indicators && blinkenlights)
871                 hub->indicator [0] = INDICATOR_CYCLE;
872
873         hub_power_on(hub);
874         hub_activate(hub);
875         return 0;
876
877 fail:
878         dev_err (hub_dev, "config failed, %s (err %d)\n",
879                         message, ret);
880         /* hub_disconnect() frees urb and descriptor */
881         return ret;
882 }
883
884 static void hub_release(struct kref *kref)
885 {
886         struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
887
888         usb_put_intf(to_usb_interface(hub->intfdev));
889         kfree(hub);
890 }
891
892 static unsigned highspeed_hubs;
893
894 static void hub_disconnect(struct usb_interface *intf)
895 {
896         struct usb_hub *hub = usb_get_intfdata (intf);
897
898         /* Take the hub off the event list and don't let it be added again */
899         spin_lock_irq(&hub_event_lock);
900         list_del_init(&hub->event_list);
901         hub->disconnected = 1;
902         spin_unlock_irq(&hub_event_lock);
903
904         /* Disconnect all children and quiesce the hub */
905         hub->error = 0;
906         hub_pre_reset(intf);
907
908         usb_set_intfdata (intf, NULL);
909
910         if (hub->hdev->speed == USB_SPEED_HIGH)
911                 highspeed_hubs--;
912
913         usb_free_urb(hub->urb);
914         kfree(hub->descriptor);
915         kfree(hub->status);
916         usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
917                         hub->buffer_dma);
918
919         kref_put(&hub->kref, hub_release);
920 }
921
922 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
923 {
924         struct usb_host_interface *desc;
925         struct usb_endpoint_descriptor *endpoint;
926         struct usb_device *hdev;
927         struct usb_hub *hub;
928
929         desc = intf->cur_altsetting;
930         hdev = interface_to_usbdev(intf);
931
932 #ifdef  CONFIG_USB_OTG_BLACKLIST_HUB
933         if (hdev->parent) {
934                 dev_warn(&intf->dev, "ignoring external hub\n");
935                 return -ENODEV;
936         }
937 #endif
938
939         /* Some hubs have a subclass of 1, which AFAICT according to the */
940         /*  specs is not defined, but it works */
941         if ((desc->desc.bInterfaceSubClass != 0) &&
942             (desc->desc.bInterfaceSubClass != 1)) {
943 descriptor_error:
944                 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
945                 return -EIO;
946         }
947
948         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
949         if (desc->desc.bNumEndpoints != 1)
950                 goto descriptor_error;
951
952         endpoint = &desc->endpoint[0].desc;
953
954         /* If it's not an interrupt in endpoint, we'd better punt! */
955         if (!usb_endpoint_is_int_in(endpoint))
956                 goto descriptor_error;
957
958         /* We found a hub */
959         dev_info (&intf->dev, "USB hub found\n");
960
961         hub = kzalloc(sizeof(*hub), GFP_KERNEL);
962         if (!hub) {
963                 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
964                 return -ENOMEM;
965         }
966
967         kref_init(&hub->kref);
968         INIT_LIST_HEAD(&hub->event_list);
969         hub->intfdev = &intf->dev;
970         hub->hdev = hdev;
971         INIT_DELAYED_WORK(&hub->leds, led_work);
972         usb_get_intf(intf);
973
974         usb_set_intfdata (intf, hub);
975         intf->needs_remote_wakeup = 1;
976
977         if (hdev->speed == USB_SPEED_HIGH)
978                 highspeed_hubs++;
979
980         if (hub_configure(hub, endpoint) >= 0)
981                 return 0;
982
983         hub_disconnect (intf);
984         return -ENODEV;
985 }
986
987 static int
988 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
989 {
990         struct usb_device *hdev = interface_to_usbdev (intf);
991
992         /* assert ifno == 0 (part of hub spec) */
993         switch (code) {
994         case USBDEVFS_HUB_PORTINFO: {
995                 struct usbdevfs_hub_portinfo *info = user_data;
996                 int i;
997
998                 spin_lock_irq(&device_state_lock);
999                 if (hdev->devnum <= 0)
1000                         info->nports = 0;
1001                 else {
1002                         info->nports = hdev->maxchild;
1003                         for (i = 0; i < info->nports; i++) {
1004                                 if (hdev->children[i] == NULL)
1005                                         info->port[i] = 0;
1006                                 else
1007                                         info->port[i] =
1008                                                 hdev->children[i]->devnum;
1009                         }
1010                 }
1011                 spin_unlock_irq(&device_state_lock);
1012
1013                 return info->nports + 1;
1014                 }
1015
1016         default:
1017                 return -ENOSYS;
1018         }
1019 }
1020
1021
1022 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1023 {
1024         int i;
1025
1026         for (i = 0; i < udev->maxchild; ++i) {
1027                 if (udev->children[i])
1028                         recursively_mark_NOTATTACHED(udev->children[i]);
1029         }
1030         if (udev->state == USB_STATE_SUSPENDED)
1031                 udev->discon_suspended = 1;
1032         udev->state = USB_STATE_NOTATTACHED;
1033 }
1034
1035 /**
1036  * usb_set_device_state - change a device's current state (usbcore, hcds)
1037  * @udev: pointer to device whose state should be changed
1038  * @new_state: new state value to be stored
1039  *
1040  * udev->state is _not_ fully protected by the device lock.  Although
1041  * most transitions are made only while holding the lock, the state can
1042  * can change to USB_STATE_NOTATTACHED at almost any time.  This
1043  * is so that devices can be marked as disconnected as soon as possible,
1044  * without having to wait for any semaphores to be released.  As a result,
1045  * all changes to any device's state must be protected by the
1046  * device_state_lock spinlock.
1047  *
1048  * Once a device has been added to the device tree, all changes to its state
1049  * should be made using this routine.  The state should _not_ be set directly.
1050  *
1051  * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1052  * Otherwise udev->state is set to new_state, and if new_state is
1053  * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1054  * to USB_STATE_NOTATTACHED.
1055  */
1056 void usb_set_device_state(struct usb_device *udev,
1057                 enum usb_device_state new_state)
1058 {
1059         unsigned long flags;
1060
1061         spin_lock_irqsave(&device_state_lock, flags);
1062         if (udev->state == USB_STATE_NOTATTACHED)
1063                 ;       /* do nothing */
1064         else if (new_state != USB_STATE_NOTATTACHED) {
1065
1066                 /* root hub wakeup capabilities are managed out-of-band
1067                  * and may involve silicon errata ... ignore them here.
1068                  */
1069                 if (udev->parent) {
1070                         if (udev->state == USB_STATE_SUSPENDED
1071                                         || new_state == USB_STATE_SUSPENDED)
1072                                 ;       /* No change to wakeup settings */
1073                         else if (new_state == USB_STATE_CONFIGURED)
1074                                 device_init_wakeup(&udev->dev,
1075                                         (udev->actconfig->desc.bmAttributes
1076                                          & USB_CONFIG_ATT_WAKEUP));
1077                         else
1078                                 device_init_wakeup(&udev->dev, 0);
1079                 }
1080                 udev->state = new_state;
1081         } else
1082                 recursively_mark_NOTATTACHED(udev);
1083         spin_unlock_irqrestore(&device_state_lock, flags);
1084 }
1085
1086 static void choose_address(struct usb_device *udev)
1087 {
1088         int             devnum;
1089         struct usb_bus  *bus = udev->bus;
1090
1091         /* If khubd ever becomes multithreaded, this will need a lock */
1092
1093         /* Try to allocate the next devnum beginning at bus->devnum_next. */
1094         devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1095                         bus->devnum_next);
1096         if (devnum >= 128)
1097                 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1098
1099         bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1100
1101         if (devnum < 128) {
1102                 set_bit(devnum, bus->devmap.devicemap);
1103                 udev->devnum = devnum;
1104         }
1105 }
1106
1107 static void release_address(struct usb_device *udev)
1108 {
1109         if (udev->devnum > 0) {
1110                 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1111                 udev->devnum = -1;
1112         }
1113 }
1114
1115 #ifdef  CONFIG_USB_SUSPEND
1116
1117 static void usb_stop_pm(struct usb_device *udev)
1118 {
1119         /* Synchronize with the ksuspend thread to prevent any more
1120          * autosuspend requests from being submitted, and decrement
1121          * the parent's count of unsuspended children.
1122          */
1123         usb_pm_lock(udev);
1124         if (udev->parent && !udev->discon_suspended)
1125                 usb_autosuspend_device(udev->parent);
1126         usb_pm_unlock(udev);
1127
1128         /* Stop any autosuspend requests already submitted */
1129         cancel_rearming_delayed_work(&udev->autosuspend);
1130 }
1131
1132 #else
1133
1134 static inline void usb_stop_pm(struct usb_device *udev)
1135 { }
1136
1137 #endif
1138
1139 /**
1140  * usb_disconnect - disconnect a device (usbcore-internal)
1141  * @pdev: pointer to device being disconnected
1142  * Context: !in_interrupt ()
1143  *
1144  * Something got disconnected. Get rid of it and all of its children.
1145  *
1146  * If *pdev is a normal device then the parent hub must already be locked.
1147  * If *pdev is a root hub then this routine will acquire the
1148  * usb_bus_list_lock on behalf of the caller.
1149  *
1150  * Only hub drivers (including virtual root hub drivers for host
1151  * controllers) should ever call this.
1152  *
1153  * This call is synchronous, and may not be used in an interrupt context.
1154  */
1155 void usb_disconnect(struct usb_device **pdev)
1156 {
1157         struct usb_device       *udev = *pdev;
1158         int                     i;
1159
1160         if (!udev) {
1161                 pr_debug ("%s nodev\n", __FUNCTION__);
1162                 return;
1163         }
1164
1165         /* mark the device as inactive, so any further urb submissions for
1166          * this device (and any of its children) will fail immediately.
1167          * this quiesces everyting except pending urbs.
1168          */
1169         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1170         dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1171
1172         usb_lock_device(udev);
1173
1174         /* Free up all the children before we remove this device */
1175         for (i = 0; i < USB_MAXCHILDREN; i++) {
1176                 if (udev->children[i])
1177                         usb_disconnect(&udev->children[i]);
1178         }
1179
1180         /* deallocate hcd/hardware state ... nuking all pending urbs and
1181          * cleaning up all state associated with the current configuration
1182          * so that the hardware is now fully quiesced.
1183          */
1184         dev_dbg (&udev->dev, "unregistering device\n");
1185         usb_disable_device(udev, 0);
1186
1187         usb_unlock_device(udev);
1188
1189         /* Unregister the device.  The device driver is responsible
1190          * for removing the device files from usbfs and sysfs and for
1191          * de-configuring the device.
1192          */
1193         device_del(&udev->dev);
1194
1195         /* Free the device number and delete the parent's children[]
1196          * (or root_hub) pointer.
1197          */
1198         release_address(udev);
1199
1200         /* Avoid races with recursively_mark_NOTATTACHED() */
1201         spin_lock_irq(&device_state_lock);
1202         *pdev = NULL;
1203         spin_unlock_irq(&device_state_lock);
1204
1205         usb_stop_pm(udev);
1206
1207         put_device(&udev->dev);
1208 }
1209
1210 #ifdef DEBUG
1211 static void show_string(struct usb_device *udev, char *id, char *string)
1212 {
1213         if (!string)
1214                 return;
1215         dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1216 }
1217
1218 #else
1219 static inline void show_string(struct usb_device *udev, char *id, char *string)
1220 {}
1221 #endif
1222
1223
1224 #ifdef  CONFIG_USB_OTG
1225 #include "otg_whitelist.h"
1226 #endif
1227
1228 /**
1229  * usb_configure_device_otg - FIXME (usbcore-internal)
1230  * @udev: newly addressed device (in ADDRESS state)
1231  *
1232  * Do configuration for On-The-Go devices
1233  */
1234 static int usb_configure_device_otg(struct usb_device *udev)
1235 {
1236         int err = 0;
1237
1238 #ifdef  CONFIG_USB_OTG
1239         /*
1240          * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1241          * to wake us after we've powered off VBUS; and HNP, switching roles
1242          * "host" to "peripheral".  The OTG descriptor helps figure this out.
1243          */
1244         if (!udev->bus->is_b_host
1245                         && udev->config
1246                         && udev->parent == udev->bus->root_hub) {
1247                 struct usb_otg_descriptor       *desc = 0;
1248                 struct usb_bus                  *bus = udev->bus;
1249
1250                 /* descriptor may appear anywhere in config */
1251                 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1252                                         le16_to_cpu(udev->config[0].desc.wTotalLength),
1253                                         USB_DT_OTG, (void **) &desc) == 0) {
1254                         if (desc->bmAttributes & USB_OTG_HNP) {
1255                                 unsigned                port1 = udev->portnum;
1256
1257                                 dev_info(&udev->dev,
1258                                         "Dual-Role OTG device on %sHNP port\n",
1259                                         (port1 == bus->otg_port)
1260                                                 ? "" : "non-");
1261
1262                                 /* enable HNP before suspend, it's simpler */
1263                                 if (port1 == bus->otg_port)
1264                                         bus->b_hnp_enable = 1;
1265                                 err = usb_control_msg(udev,
1266                                         usb_sndctrlpipe(udev, 0),
1267                                         USB_REQ_SET_FEATURE, 0,
1268                                         bus->b_hnp_enable
1269                                                 ? USB_DEVICE_B_HNP_ENABLE
1270                                                 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1271                                         0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1272                                 if (err < 0) {
1273                                         /* OTG MESSAGE: report errors here,
1274                                          * customize to match your product.
1275                                          */
1276                                         dev_info(&udev->dev,
1277                                                 "can't set HNP mode; %d\n",
1278                                                 err);
1279                                         bus->b_hnp_enable = 0;
1280                                 }
1281                         }
1282                 }
1283         }
1284
1285         if (!is_targeted(udev)) {
1286
1287                 /* Maybe it can talk to us, though we can't talk to it.
1288                  * (Includes HNP test device.)
1289                  */
1290                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1291                         err = usb_port_suspend(udev);
1292                         if (err < 0)
1293                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1294                 }
1295                 err = -ENOTSUPP;
1296                 goto fail;
1297         }
1298 fail:
1299 #endif
1300         return err;
1301 }
1302
1303
1304 /**
1305  * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1306  * @udev: newly addressed device (in ADDRESS state)
1307  *
1308  * This is only called by usb_new_device() and usb_authorize_device()
1309  * and FIXME -- all comments that apply to them apply here wrt to
1310  * environment.
1311  *
1312  * If the device is WUSB and not authorized, we don't attempt to read
1313  * the string descriptors, as they will be errored out by the device
1314  * until it has been authorized.
1315  */
1316 static int usb_configure_device(struct usb_device *udev)
1317 {
1318         int err;
1319
1320         if (udev->config == NULL) {
1321                 err = usb_get_configuration(udev);
1322                 if (err < 0) {
1323                         dev_err(&udev->dev, "can't read configurations, error %d\n",
1324                                 err);
1325                         goto fail;
1326                 }
1327         }
1328         if (udev->wusb == 1 && udev->authorized == 0) {
1329                 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1330                 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1331                 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1332         }
1333         else {
1334                 /* read the standard strings and cache them if present */
1335                 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1336                 udev->manufacturer = usb_cache_string(udev,
1337                                                       udev->descriptor.iManufacturer);
1338                 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1339         }
1340         err = usb_configure_device_otg(udev);
1341 fail:
1342         return err;
1343 }
1344
1345
1346 /**
1347  * usb_new_device - perform initial device setup (usbcore-internal)
1348  * @udev: newly addressed device (in ADDRESS state)
1349  *
1350  * This is called with devices which have been enumerated, but not yet
1351  * configured.  The device descriptor is available, but not descriptors
1352  * for any device configuration.  The caller must have locked either
1353  * the parent hub (if udev is a normal device) or else the
1354  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1355  * udev has already been installed, but udev is not yet visible through
1356  * sysfs or other filesystem code.
1357  *
1358  * It will return if the device is configured properly or not.  Zero if
1359  * the interface was registered with the driver core; else a negative
1360  * errno value.
1361  *
1362  * This call is synchronous, and may not be used in an interrupt context.
1363  *
1364  * Only the hub driver or root-hub registrar should ever call this.
1365  */
1366 int usb_new_device(struct usb_device *udev)
1367 {
1368         int err;
1369
1370         usb_detect_quirks(udev);                /* Determine quirks */
1371         err = usb_configure_device(udev);       /* detect & probe dev/intfs */
1372         if (err < 0)
1373                 goto fail;
1374         /* export the usbdev device-node for libusb */
1375         udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1376                         (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1377
1378         /* Increment the parent's count of unsuspended children */
1379         if (udev->parent)
1380                 usb_autoresume_device(udev->parent);
1381
1382         /* Register the device.  The device driver is responsible
1383          * for adding the device files to sysfs and for configuring
1384          * the device.
1385          */
1386         err = device_add(&udev->dev);
1387         if (err) {
1388                 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1389                 goto fail;
1390         }
1391
1392         /* Tell the world! */
1393         dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1394                 "SerialNumber=%d\n",
1395                 udev->descriptor.iManufacturer,
1396                 udev->descriptor.iProduct,
1397                 udev->descriptor.iSerialNumber);
1398         show_string(udev, "Product", udev->product);
1399         show_string(udev, "Manufacturer", udev->manufacturer);
1400         show_string(udev, "SerialNumber", udev->serial);
1401         return err;
1402
1403 fail:
1404         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1405         return err;
1406 }
1407
1408
1409 /**
1410  * Similar to usb_disconnect()
1411  *
1412  * We share a lock (that we have) with device_del(), so we need to
1413  * defer its call.
1414  */
1415 int usb_deauthorize_device(struct usb_device *usb_dev)
1416 {
1417         unsigned cnt;
1418         usb_lock_device(usb_dev);
1419         if (usb_dev->authorized == 0)
1420                 goto out_unauthorized;
1421         usb_dev->authorized = 0;
1422         usb_set_configuration(usb_dev, -1);
1423         usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1424         usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1425         usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1426         kfree(usb_dev->config);
1427         usb_dev->config = NULL;
1428         for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
1429                 kfree(usb_dev->rawdescriptors[cnt]);
1430         usb_dev->descriptor.bNumConfigurations = 0;
1431         kfree(usb_dev->rawdescriptors);
1432 out_unauthorized:
1433         usb_unlock_device(usb_dev);
1434         return 0;
1435 }
1436
1437
1438 int usb_authorize_device(struct usb_device *usb_dev)
1439 {
1440         int result = 0, c;
1441         usb_lock_device(usb_dev);
1442         if (usb_dev->authorized == 1)
1443                 goto out_authorized;
1444         kfree(usb_dev->product);
1445         usb_dev->product = NULL;
1446         kfree(usb_dev->manufacturer);
1447         usb_dev->manufacturer = NULL;
1448         kfree(usb_dev->serial);
1449         usb_dev->serial = NULL;
1450         result = usb_autoresume_device(usb_dev);
1451         if (result < 0) {
1452                 dev_err(&usb_dev->dev,
1453                         "can't autoresume for authorization: %d\n", result);
1454                 goto error_autoresume;
1455         }
1456         result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1457         if (result < 0) {
1458                 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1459                         "authorization: %d\n", result);
1460                 goto error_device_descriptor;
1461         }
1462         usb_dev->authorized = 1;
1463         result = usb_configure_device(usb_dev);
1464         if (result < 0)
1465                 goto error_configure;
1466         /* Choose and set the configuration.  This registers the interfaces
1467          * with the driver core and lets interface drivers bind to them.
1468          */
1469         c = usb_choose_configuration(usb_dev);
1470         if (c >= 0) {
1471                 result = usb_set_configuration(usb_dev, c);
1472                 if (result) {
1473                         dev_err(&usb_dev->dev,
1474                                 "can't set config #%d, error %d\n", c, result);
1475                         /* This need not be fatal.  The user can try to
1476                          * set other configurations. */
1477                 }
1478         }
1479         dev_info(&usb_dev->dev, "authorized to connect\n");
1480 error_configure:
1481 error_device_descriptor:
1482 error_autoresume:
1483 out_authorized:
1484         usb_unlock_device(usb_dev);     // complements locktree
1485         return result;
1486 }
1487
1488
1489 static int hub_port_status(struct usb_hub *hub, int port1,
1490                                u16 *status, u16 *change)
1491 {
1492         int ret;
1493
1494         mutex_lock(&hub->status_mutex);
1495         ret = get_port_status(hub->hdev, port1, &hub->status->port);
1496         if (ret < 4) {
1497                 dev_err (hub->intfdev,
1498                         "%s failed (err = %d)\n", __FUNCTION__, ret);
1499                 if (ret >= 0)
1500                         ret = -EIO;
1501         } else {
1502                 *status = le16_to_cpu(hub->status->port.wPortStatus);
1503                 *change = le16_to_cpu(hub->status->port.wPortChange); 
1504                 ret = 0;
1505         }
1506         mutex_unlock(&hub->status_mutex);
1507         return ret;
1508 }
1509
1510
1511 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1512 static unsigned hub_is_wusb(struct usb_hub *hub)
1513 {
1514         struct usb_hcd *hcd;
1515         if (hub->hdev->parent != NULL)  /* not a root hub? */
1516                 return 0;
1517         hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1518         return hcd->wireless;
1519 }
1520
1521
1522 #define PORT_RESET_TRIES        5
1523 #define SET_ADDRESS_TRIES       2
1524 #define GET_DESCRIPTOR_TRIES    2
1525 #define SET_CONFIG_TRIES        (2 * (use_both_schemes + 1))
1526 #define USE_NEW_SCHEME(i)       ((i) / 2 == old_scheme_first)
1527
1528 #define HUB_ROOT_RESET_TIME     50      /* times are in msec */
1529 #define HUB_SHORT_RESET_TIME    10
1530 #define HUB_LONG_RESET_TIME     200
1531 #define HUB_RESET_TIMEOUT       500
1532
1533 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1534                                 struct usb_device *udev, unsigned int delay)
1535 {
1536         int delay_time, ret;
1537         u16 portstatus;
1538         u16 portchange;
1539
1540         for (delay_time = 0;
1541                         delay_time < HUB_RESET_TIMEOUT;
1542                         delay_time += delay) {
1543                 /* wait to give the device a chance to reset */
1544                 msleep(delay);
1545
1546                 /* read and decode port status */
1547                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1548                 if (ret < 0)
1549                         return ret;
1550
1551                 /* Device went away? */
1552                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1553                         return -ENOTCONN;
1554
1555                 /* bomb out completely if the connection bounced */
1556                 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1557                         return -ENOTCONN;
1558
1559                 /* if we`ve finished resetting, then break out of the loop */
1560                 if (!(portstatus & USB_PORT_STAT_RESET) &&
1561                     (portstatus & USB_PORT_STAT_ENABLE)) {
1562                         if (hub_is_wusb(hub))
1563                                 udev->speed = USB_SPEED_VARIABLE;
1564                         else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1565                                 udev->speed = USB_SPEED_HIGH;
1566                         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1567                                 udev->speed = USB_SPEED_LOW;
1568                         else
1569                                 udev->speed = USB_SPEED_FULL;
1570                         return 0;
1571                 }
1572
1573                 /* switch to the long delay after two short delay failures */
1574                 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1575                         delay = HUB_LONG_RESET_TIME;
1576
1577                 dev_dbg (hub->intfdev,
1578                         "port %d not reset yet, waiting %dms\n",
1579                         port1, delay);
1580         }
1581
1582         return -EBUSY;
1583 }
1584
1585 static int hub_port_reset(struct usb_hub *hub, int port1,
1586                                 struct usb_device *udev, unsigned int delay)
1587 {
1588         int i, status;
1589
1590         /* Block EHCI CF initialization during the port reset.
1591          * Some companion controllers don't like it when they mix.
1592          */
1593         down_read(&ehci_cf_port_reset_rwsem);
1594
1595         /* Reset the port */
1596         for (i = 0; i < PORT_RESET_TRIES; i++) {
1597                 status = set_port_feature(hub->hdev,
1598                                 port1, USB_PORT_FEAT_RESET);
1599                 if (status)
1600                         dev_err(hub->intfdev,
1601                                         "cannot reset port %d (err = %d)\n",
1602                                         port1, status);
1603                 else {
1604                         status = hub_port_wait_reset(hub, port1, udev, delay);
1605                         if (status && status != -ENOTCONN)
1606                                 dev_dbg(hub->intfdev,
1607                                                 "port_wait_reset: err = %d\n",
1608                                                 status);
1609                 }
1610
1611                 /* return on disconnect or reset */
1612                 switch (status) {
1613                 case 0:
1614                         /* TRSTRCY = 10 ms; plus some extra */
1615                         msleep(10 + 40);
1616                         udev->devnum = 0;       /* Device now at address 0 */
1617                         /* FALL THROUGH */
1618                 case -ENOTCONN:
1619                 case -ENODEV:
1620                         clear_port_feature(hub->hdev,
1621                                 port1, USB_PORT_FEAT_C_RESET);
1622                         /* FIXME need disconnect() for NOTATTACHED device */
1623                         usb_set_device_state(udev, status
1624                                         ? USB_STATE_NOTATTACHED
1625                                         : USB_STATE_DEFAULT);
1626                         goto done;
1627                 }
1628
1629                 dev_dbg (hub->intfdev,
1630                         "port %d not enabled, trying reset again...\n",
1631                         port1);
1632                 delay = HUB_LONG_RESET_TIME;
1633         }
1634
1635         dev_err (hub->intfdev,
1636                 "Cannot enable port %i.  Maybe the USB cable is bad?\n",
1637                 port1);
1638
1639  done:
1640         up_read(&ehci_cf_port_reset_rwsem);
1641         return status;
1642 }
1643
1644 #ifdef  CONFIG_PM
1645
1646 #ifdef  CONFIG_USB_SUSPEND
1647
1648 /*
1649  * usb_port_suspend - suspend a usb device's upstream port
1650  * @udev: device that's no longer in active use, not a root hub
1651  * Context: must be able to sleep; device not locked; pm locks held
1652  *
1653  * Suspends a USB device that isn't in active use, conserving power.
1654  * Devices may wake out of a suspend, if anything important happens,
1655  * using the remote wakeup mechanism.  They may also be taken out of
1656  * suspend by the host, using usb_port_resume().  It's also routine
1657  * to disconnect devices while they are suspended.
1658  *
1659  * This only affects the USB hardware for a device; its interfaces
1660  * (and, for hubs, child devices) must already have been suspended.
1661  *
1662  * Selective port suspend reduces power; most suspended devices draw
1663  * less than 500 uA.  It's also used in OTG, along with remote wakeup.
1664  * All devices below the suspended port are also suspended.
1665  *
1666  * Devices leave suspend state when the host wakes them up.  Some devices
1667  * also support "remote wakeup", where the device can activate the USB
1668  * tree above them to deliver data, such as a keypress or packet.  In
1669  * some cases, this wakes the USB host.
1670  *
1671  * Suspending OTG devices may trigger HNP, if that's been enabled
1672  * between a pair of dual-role devices.  That will change roles, such
1673  * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1674  *
1675  * Devices on USB hub ports have only one "suspend" state, corresponding
1676  * to ACPI D2, "may cause the device to lose some context".
1677  * State transitions include:
1678  *
1679  *   - suspend, resume ... when the VBUS power link stays live
1680  *   - suspend, disconnect ... VBUS lost
1681  *
1682  * Once VBUS drop breaks the circuit, the port it's using has to go through
1683  * normal re-enumeration procedures, starting with enabling VBUS power.
1684  * Other than re-initializing the hub (plug/unplug, except for root hubs),
1685  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
1686  * timer, no SRP, no requests through sysfs.
1687  *
1688  * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1689  * the root hub for their bus goes into global suspend ... so we don't
1690  * (falsely) update the device power state to say it suspended.
1691  *
1692  * Returns 0 on success, else negative errno.
1693  */
1694 int usb_port_suspend(struct usb_device *udev)
1695 {
1696         struct usb_hub  *hub = hdev_to_hub(udev->parent);
1697         int             port1 = udev->portnum;
1698         int             status;
1699
1700         // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1701
1702         /* enable remote wakeup when appropriate; this lets the device
1703          * wake up the upstream hub (including maybe the root hub).
1704          *
1705          * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
1706          * we don't explicitly enable it here.
1707          */
1708         if (udev->do_remote_wakeup) {
1709                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1710                                 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1711                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1712                                 NULL, 0,
1713                                 USB_CTRL_SET_TIMEOUT);
1714                 if (status)
1715                         dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1716                                         status);
1717         }
1718
1719         /* see 7.1.7.6 */
1720         status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1721         if (status) {
1722                 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1723                                 port1, status);
1724                 /* paranoia:  "should not happen" */
1725                 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1726                                 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1727                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1728                                 NULL, 0,
1729                                 USB_CTRL_SET_TIMEOUT);
1730         } else {
1731                 /* device has up to 10 msec to fully suspend */
1732                 dev_dbg(&udev->dev, "usb %ssuspend\n",
1733                                 udev->auto_pm ? "auto-" : "");
1734                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1735                 msleep(10);
1736         }
1737         return status;
1738 }
1739
1740 /*
1741  * If the USB "suspend" state is in use (rather than "global suspend"),
1742  * many devices will be individually taken out of suspend state using
1743  * special "resume" signaling.  This routine kicks in shortly after
1744  * hardware resume signaling is finished, either because of selective
1745  * resume (by host) or remote wakeup (by device) ... now see what changed
1746  * in the tree that's rooted at this device.
1747  *
1748  * If @udev->reset_resume is set then the device is reset before the
1749  * status check is done.
1750  */
1751 static int finish_port_resume(struct usb_device *udev)
1752 {
1753         int     status = 0;
1754         u16     devstatus;
1755
1756         /* caller owns the udev device lock */
1757         dev_dbg(&udev->dev, "finish %sresume\n",
1758                         udev->reset_resume ? "reset-" : "");
1759
1760         /* usb ch9 identifies four variants of SUSPENDED, based on what
1761          * state the device resumes to.  Linux currently won't see the
1762          * first two on the host side; they'd be inside hub_port_init()
1763          * during many timeouts, but khubd can't suspend until later.
1764          */
1765         usb_set_device_state(udev, udev->actconfig
1766                         ? USB_STATE_CONFIGURED
1767                         : USB_STATE_ADDRESS);
1768
1769         /* 10.5.4.5 says not to reset a suspended port if the attached
1770          * device is enabled for remote wakeup.  Hence the reset
1771          * operation is carried out here, after the port has been
1772          * resumed.
1773          */
1774         if (udev->reset_resume)
1775                 status = usb_reset_device(udev);
1776
1777         /* 10.5.4.5 says be sure devices in the tree are still there.
1778          * For now let's assume the device didn't go crazy on resume,
1779          * and device drivers will know about any resume quirks.
1780          */
1781         if (status == 0) {
1782                 devstatus = 0;
1783                 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1784                 if (status >= 0)
1785                         status = (status > 0 ? 0 : -ENODEV);
1786         }
1787
1788         if (status) {
1789                 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
1790                                 status);
1791         } else if (udev->actconfig) {
1792                 le16_to_cpus(&devstatus);
1793                 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1794                         status = usb_control_msg(udev,
1795                                         usb_sndctrlpipe(udev, 0),
1796                                         USB_REQ_CLEAR_FEATURE,
1797                                                 USB_RECIP_DEVICE,
1798                                         USB_DEVICE_REMOTE_WAKEUP, 0,
1799                                         NULL, 0,
1800                                         USB_CTRL_SET_TIMEOUT);
1801                         if (status)
1802                                 dev_dbg(&udev->dev, "disable remote "
1803                                         "wakeup, status %d\n", status);
1804                 }
1805                 status = 0;
1806         }
1807         return status;
1808 }
1809
1810 /*
1811  * usb_port_resume - re-activate a suspended usb device's upstream port
1812  * @udev: device to re-activate, not a root hub
1813  * Context: must be able to sleep; device not locked; pm locks held
1814  *
1815  * This will re-activate the suspended device, increasing power usage
1816  * while letting drivers communicate again with its endpoints.
1817  * USB resume explicitly guarantees that the power session between
1818  * the host and the device is the same as it was when the device
1819  * suspended.
1820  *
1821  * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1822  * routine won't check that the port is still enabled.  Furthermore,
1823  * if @udev->reset_resume is set then finish_port_resume() above will
1824  * reset @udev.  The end result is that a broken power session can be
1825  * recovered and @udev will appear to persist across a loss of VBUS power.
1826  *
1827  * For example, if a host controller doesn't maintain VBUS suspend current
1828  * during a system sleep or is reset when the system wakes up, all the USB
1829  * power sessions below it will be broken.  This is especially troublesome
1830  * for mass-storage devices containing mounted filesystems, since the
1831  * device will appear to have disconnected and all the memory mappings
1832  * to it will be lost.  Using the USB_PERSIST facility, the device can be
1833  * made to appear as if it had not disconnected.
1834  *
1835  * This facility is inherently dangerous.  Although usb_reset_device()
1836  * makes every effort to insure that the same device is present after the
1837  * reset as before, it cannot provide a 100% guarantee.  Furthermore it's
1838  * quite possible for a device to remain unaltered but its media to be
1839  * changed.  If the user replaces a flash memory card while the system is
1840  * asleep, he will have only himself to blame when the filesystem on the
1841  * new card is corrupted and the system crashes.
1842  *
1843  * Returns 0 on success, else negative errno.
1844  */
1845 int usb_port_resume(struct usb_device *udev)
1846 {
1847         struct usb_hub  *hub = hdev_to_hub(udev->parent);
1848         int             port1 = udev->portnum;
1849         int             status;
1850         u16             portchange, portstatus;
1851         unsigned        mask_flags, want_flags;
1852
1853         /* Skip the initial Clear-Suspend step for a remote wakeup */
1854         status = hub_port_status(hub, port1, &portstatus, &portchange);
1855         if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1856                 goto SuspendCleared;
1857
1858         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1859
1860         set_bit(port1, hub->busy_bits);
1861
1862         /* see 7.1.7.7; affects power usage, but not budgeting */
1863         status = clear_port_feature(hub->hdev,
1864                         port1, USB_PORT_FEAT_SUSPEND);
1865         if (status) {
1866                 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
1867                                 port1, status);
1868         } else {
1869                 /* drive resume for at least 20 msec */
1870                 dev_dbg(&udev->dev, "usb %sresume\n",
1871                                 udev->auto_pm ? "auto-" : "");
1872                 msleep(25);
1873
1874                 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1875                  * stop resume signaling.  Then finish the resume
1876                  * sequence.
1877                  */
1878                 status = hub_port_status(hub, port1, &portstatus, &portchange);
1879
1880  SuspendCleared:
1881                 if (USB_PERSIST && udev->reset_resume)
1882                         want_flags = USB_PORT_STAT_POWER
1883                                         | USB_PORT_STAT_CONNECTION;
1884                 else
1885                         want_flags = USB_PORT_STAT_POWER
1886                                         | USB_PORT_STAT_CONNECTION
1887                                         | USB_PORT_STAT_ENABLE;
1888                 mask_flags = want_flags | USB_PORT_STAT_SUSPEND;
1889
1890                 if (status < 0 || (portstatus & mask_flags) != want_flags) {
1891                         dev_dbg(hub->intfdev,
1892                                 "port %d status %04x.%04x after resume, %d\n",
1893                                 port1, portchange, portstatus, status);
1894                         if (status >= 0)
1895                                 status = -ENODEV;
1896                 } else {
1897                         if (portchange & USB_PORT_STAT_C_SUSPEND)
1898                                 clear_port_feature(hub->hdev, port1,
1899                                                 USB_PORT_FEAT_C_SUSPEND);
1900                         /* TRSMRCY = 10 msec */
1901                         msleep(10);
1902                 }
1903         }
1904
1905         clear_bit(port1, hub->busy_bits);
1906         if (!hub->hdev->parent && !hub->busy_bits[0])
1907                 usb_enable_root_hub_irq(hub->hdev->bus);
1908
1909         if (status == 0)
1910                 status = finish_port_resume(udev);
1911         if (status < 0) {
1912                 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1913                 hub_port_logical_disconnect(hub, port1);
1914         }
1915         return status;
1916 }
1917
1918 static int remote_wakeup(struct usb_device *udev)
1919 {
1920         int     status = 0;
1921
1922         usb_lock_device(udev);
1923         if (udev->state == USB_STATE_SUSPENDED) {
1924                 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1925                 usb_mark_last_busy(udev);
1926                 status = usb_external_resume_device(udev);
1927         }
1928         usb_unlock_device(udev);
1929         return status;
1930 }
1931
1932 #else   /* CONFIG_USB_SUSPEND */
1933
1934 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1935
1936 int usb_port_suspend(struct usb_device *udev)
1937 {
1938         return 0;
1939 }
1940
1941 int usb_port_resume(struct usb_device *udev)
1942 {
1943         int status = 0;
1944
1945         /* However we may need to do a reset-resume */
1946         if (udev->reset_resume) {
1947                 dev_dbg(&udev->dev, "reset-resume\n");
1948                 status = usb_reset_device(udev);
1949         }
1950         return status;
1951 }
1952
1953 static inline int remote_wakeup(struct usb_device *udev)
1954 {
1955         return 0;
1956 }
1957
1958 #endif
1959
1960 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1961 {
1962         struct usb_hub          *hub = usb_get_intfdata (intf);
1963         struct usb_device       *hdev = hub->hdev;
1964         unsigned                port1;
1965
1966         /* fail if children aren't already suspended */
1967         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1968                 struct usb_device       *udev;
1969
1970                 udev = hdev->children [port1-1];
1971                 if (udev && udev->can_submit) {
1972                         if (!hdev->auto_pm)
1973                                 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1974                                                 port1);
1975                         return -EBUSY;
1976                 }
1977         }
1978
1979         dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1980
1981         /* stop khubd and related activity */
1982         hub_quiesce(hub);
1983         return 0;
1984 }
1985
1986 static int hub_resume(struct usb_interface *intf)
1987 {
1988         struct usb_hub          *hub = usb_get_intfdata (intf);
1989
1990         dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1991
1992         /* tell khubd to look for changes on this hub */
1993         hub_activate(hub);
1994         return 0;
1995 }
1996
1997 static int hub_reset_resume(struct usb_interface *intf)
1998 {
1999         struct usb_hub *hub = usb_get_intfdata(intf);
2000         struct usb_device *hdev = hub->hdev;
2001         int port1;
2002
2003         hub_power_on(hub);
2004
2005         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2006                 struct usb_device *child = hdev->children[port1-1];
2007
2008                 if (child) {
2009
2010                         /* For "USB_PERSIST"-enabled children we must
2011                          * mark the child device for reset-resume and
2012                          * turn off the connect-change status to prevent
2013                          * khubd from disconnecting it later.
2014                          */
2015                         if (USB_PERSIST && child->persist_enabled) {
2016                                 child->reset_resume = 1;
2017                                 clear_port_feature(hdev, port1,
2018                                                 USB_PORT_FEAT_C_CONNECTION);
2019
2020                         /* Otherwise we must disconnect the child,
2021                          * but as we may not lock the child device here
2022                          * we have to do a "logical" disconnect.
2023                          */
2024                         } else {
2025                                 hub_port_logical_disconnect(hub, port1);
2026                         }
2027                 }
2028         }
2029
2030         hub_activate(hub);
2031         return 0;
2032 }
2033
2034 /**
2035  * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2036  * @rhdev: struct usb_device for the root hub
2037  *
2038  * The USB host controller driver calls this function when its root hub
2039  * is resumed and Vbus power has been interrupted or the controller
2040  * has been reset.  The routine marks @rhdev as having lost power.  When
2041  * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
2042  * is enabled then it will carry out power-session recovery, otherwise
2043  * it will disconnect all the child devices.
2044  */
2045 void usb_root_hub_lost_power(struct usb_device *rhdev)
2046 {
2047         dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2048         rhdev->reset_resume = 1;
2049 }
2050 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2051
2052 #else   /* CONFIG_PM */
2053
2054 static inline int remote_wakeup(struct usb_device *udev)
2055 {
2056         return 0;
2057 }
2058
2059 #define hub_suspend             NULL
2060 #define hub_resume              NULL
2061 #define hub_reset_resume        NULL
2062 #endif
2063
2064
2065 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2066  *
2067  * Between connect detection and reset signaling there must be a delay
2068  * of 100ms at least for debounce and power-settling.  The corresponding
2069  * timer shall restart whenever the downstream port detects a disconnect.
2070  * 
2071  * Apparently there are some bluetooth and irda-dongles and a number of
2072  * low-speed devices for which this debounce period may last over a second.
2073  * Not covered by the spec - but easy to deal with.
2074  *
2075  * This implementation uses a 1500ms total debounce timeout; if the
2076  * connection isn't stable by then it returns -ETIMEDOUT.  It checks
2077  * every 25ms for transient disconnects.  When the port status has been
2078  * unchanged for 100ms it returns the port status.
2079  */
2080
2081 #define HUB_DEBOUNCE_TIMEOUT    1500
2082 #define HUB_DEBOUNCE_STEP         25
2083 #define HUB_DEBOUNCE_STABLE      100
2084
2085 static int hub_port_debounce(struct usb_hub *hub, int port1)
2086 {
2087         int ret;
2088         int total_time, stable_time = 0;
2089         u16 portchange, portstatus;
2090         unsigned connection = 0xffff;
2091
2092         for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2093                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2094                 if (ret < 0)
2095                         return ret;
2096
2097                 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2098                      (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2099                         stable_time += HUB_DEBOUNCE_STEP;
2100                         if (stable_time >= HUB_DEBOUNCE_STABLE)
2101                                 break;
2102                 } else {
2103                         stable_time = 0;
2104                         connection = portstatus & USB_PORT_STAT_CONNECTION;
2105                 }
2106
2107                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2108                         clear_port_feature(hub->hdev, port1,
2109                                         USB_PORT_FEAT_C_CONNECTION);
2110                 }
2111
2112                 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2113                         break;
2114                 msleep(HUB_DEBOUNCE_STEP);
2115         }
2116
2117         dev_dbg (hub->intfdev,
2118                 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2119                 port1, total_time, stable_time, portstatus);
2120
2121         if (stable_time < HUB_DEBOUNCE_STABLE)
2122                 return -ETIMEDOUT;
2123         return portstatus;
2124 }
2125
2126 static void ep0_reinit(struct usb_device *udev)
2127 {
2128         usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2129         usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2130         usb_enable_endpoint(udev, &udev->ep0);
2131 }
2132
2133 #define usb_sndaddr0pipe()      (PIPE_CONTROL << 30)
2134 #define usb_rcvaddr0pipe()      ((PIPE_CONTROL << 30) | USB_DIR_IN)
2135
2136 static int hub_set_address(struct usb_device *udev, int devnum)
2137 {
2138         int retval;
2139
2140         if (devnum <= 1)
2141                 return -EINVAL;
2142         if (udev->state == USB_STATE_ADDRESS)
2143                 return 0;
2144         if (udev->state != USB_STATE_DEFAULT)
2145                 return -EINVAL;
2146         retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2147                 USB_REQ_SET_ADDRESS, 0, devnum, 0,
2148                 NULL, 0, USB_CTRL_SET_TIMEOUT);
2149         if (retval == 0) {
2150                 udev->devnum = devnum;  /* Device now using proper address */
2151                 usb_set_device_state(udev, USB_STATE_ADDRESS);
2152                 ep0_reinit(udev);
2153         }
2154         return retval;
2155 }
2156
2157 /* Reset device, (re)assign address, get device descriptor.
2158  * Device connection must be stable, no more debouncing needed.
2159  * Returns device in USB_STATE_ADDRESS, except on error.
2160  *
2161  * If this is called for an already-existing device (as part of
2162  * usb_reset_device), the caller must own the device lock.  For a
2163  * newly detected device that is not accessible through any global
2164  * pointers, it's not necessary to lock the device.
2165  */
2166 static int
2167 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2168                 int retry_counter)
2169 {
2170         static DEFINE_MUTEX(usb_address0_mutex);
2171
2172         struct usb_device       *hdev = hub->hdev;
2173         int                     i, j, retval;
2174         unsigned                delay = HUB_SHORT_RESET_TIME;
2175         enum usb_device_speed   oldspeed = udev->speed;
2176         char                    *speed, *type;
2177         int                     devnum = udev->devnum;
2178
2179         /* root hub ports have a slightly longer reset period
2180          * (from USB 2.0 spec, section 7.1.7.5)
2181          */
2182         if (!hdev->parent) {
2183                 delay = HUB_ROOT_RESET_TIME;
2184                 if (port1 == hdev->bus->otg_port)
2185                         hdev->bus->b_hnp_enable = 0;
2186         }
2187
2188         /* Some low speed devices have problems with the quick delay, so */
2189         /*  be a bit pessimistic with those devices. RHbug #23670 */
2190         if (oldspeed == USB_SPEED_LOW)
2191                 delay = HUB_LONG_RESET_TIME;
2192
2193         mutex_lock(&usb_address0_mutex);
2194
2195         /* Reset the device; full speed may morph to high speed */
2196         retval = hub_port_reset(hub, port1, udev, delay);
2197         if (retval < 0)         /* error or disconnect */
2198                 goto fail;
2199                                 /* success, speed is known */
2200         retval = -ENODEV;
2201
2202         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2203                 dev_dbg(&udev->dev, "device reset changed speed!\n");
2204                 goto fail;
2205         }
2206         oldspeed = udev->speed;
2207
2208         /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2209          * it's fixed size except for full speed devices.
2210          * For Wireless USB devices, ep0 max packet is always 512 (tho
2211          * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2212          */
2213         switch (udev->speed) {
2214         case USB_SPEED_VARIABLE:        /* fixed at 512 */
2215                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2216                 break;
2217         case USB_SPEED_HIGH:            /* fixed at 64 */
2218                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2219                 break;
2220         case USB_SPEED_FULL:            /* 8, 16, 32, or 64 */
2221                 /* to determine the ep0 maxpacket size, try to read
2222                  * the device descriptor to get bMaxPacketSize0 and
2223                  * then correct our initial guess.
2224                  */
2225                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2226                 break;
2227         case USB_SPEED_LOW:             /* fixed at 8 */
2228                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2229                 break;
2230         default:
2231                 goto fail;
2232         }
2233  
2234         type = "";
2235         switch (udev->speed) {
2236         case USB_SPEED_LOW:     speed = "low";  break;
2237         case USB_SPEED_FULL:    speed = "full"; break;
2238         case USB_SPEED_HIGH:    speed = "high"; break;
2239         case USB_SPEED_VARIABLE:
2240                                 speed = "variable";
2241                                 type = "Wireless ";
2242                                 break;
2243         default:                speed = "?";    break;
2244         }
2245         dev_info (&udev->dev,
2246                   "%s %s speed %sUSB device using %s and address %d\n",
2247                   (udev->config) ? "reset" : "new", speed, type,
2248                   udev->bus->controller->driver->name, devnum);
2249
2250         /* Set up TT records, if needed  */
2251         if (hdev->tt) {
2252                 udev->tt = hdev->tt;
2253                 udev->ttport = hdev->ttport;
2254         } else if (udev->speed != USB_SPEED_HIGH
2255                         && hdev->speed == USB_SPEED_HIGH) {
2256                 udev->tt = &hub->tt;
2257                 udev->ttport = port1;
2258         }
2259  
2260         /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2261          * Because device hardware and firmware is sometimes buggy in
2262          * this area, and this is how Linux has done it for ages.
2263          * Change it cautiously.
2264          *
2265          * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2266          * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2267          * so it may help with some non-standards-compliant devices.
2268          * Otherwise we start with SET_ADDRESS and then try to read the
2269          * first 8 bytes of the device descriptor to get the ep0 maxpacket
2270          * value.
2271          */
2272         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2273                 if (USE_NEW_SCHEME(retry_counter)) {
2274                         struct usb_device_descriptor *buf;
2275                         int r = 0;
2276
2277 #define GET_DESCRIPTOR_BUFSIZE  64
2278                         buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2279                         if (!buf) {
2280                                 retval = -ENOMEM;
2281                                 continue;
2282                         }
2283
2284                         /* Retry on all errors; some devices are flakey.
2285                          * 255 is for WUSB devices, we actually need to use
2286                          * 512 (WUSB1.0[4.8.1]).
2287                          */
2288                         for (j = 0; j < 3; ++j) {
2289                                 buf->bMaxPacketSize0 = 0;
2290                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2291                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2292                                         USB_DT_DEVICE << 8, 0,
2293                                         buf, GET_DESCRIPTOR_BUFSIZE,
2294                                         USB_CTRL_GET_TIMEOUT);
2295                                 switch (buf->bMaxPacketSize0) {
2296                                 case 8: case 16: case 32: case 64: case 255:
2297                                         if (buf->bDescriptorType ==
2298                                                         USB_DT_DEVICE) {
2299                                                 r = 0;
2300                                                 break;
2301                                         }
2302                                         /* FALL THROUGH */
2303                                 default:
2304                                         if (r == 0)
2305                                                 r = -EPROTO;
2306                                         break;
2307                                 }
2308                                 if (r == 0)
2309                                         break;
2310                         }
2311                         udev->descriptor.bMaxPacketSize0 =
2312                                         buf->bMaxPacketSize0;
2313                         kfree(buf);
2314
2315                         retval = hub_port_reset(hub, port1, udev, delay);
2316                         if (retval < 0)         /* error or disconnect */
2317                                 goto fail;
2318                         if (oldspeed != udev->speed) {
2319                                 dev_dbg(&udev->dev,
2320                                         "device reset changed speed!\n");
2321                                 retval = -ENODEV;
2322                                 goto fail;
2323                         }
2324                         if (r) {
2325                                 dev_err(&udev->dev, "device descriptor "
2326                                                 "read/%s, error %d\n",
2327                                                 "64", r);
2328                                 retval = -EMSGSIZE;
2329                                 continue;
2330                         }
2331 #undef GET_DESCRIPTOR_BUFSIZE
2332                 }
2333
2334                 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2335                         retval = hub_set_address(udev, devnum);
2336                         if (retval >= 0)
2337                                 break;
2338                         msleep(200);
2339                 }
2340                 if (retval < 0) {
2341                         dev_err(&udev->dev,
2342                                 "device not accepting address %d, error %d\n",
2343                                 devnum, retval);
2344                         goto fail;
2345                 }
2346  
2347                 /* cope with hardware quirkiness:
2348                  *  - let SET_ADDRESS settle, some device hardware wants it
2349                  *  - read ep0 maxpacket even for high and low speed,
2350                  */
2351                 msleep(10);
2352                 if (USE_NEW_SCHEME(retry_counter))
2353                         break;
2354
2355                 retval = usb_get_device_descriptor(udev, 8);
2356                 if (retval < 8) {
2357                         dev_err(&udev->dev, "device descriptor "
2358                                         "read/%s, error %d\n",
2359                                         "8", retval);
2360                         if (retval >= 0)
2361                                 retval = -EMSGSIZE;
2362                 } else {
2363                         retval = 0;
2364                         break;
2365                 }
2366         }
2367         if (retval)
2368                 goto fail;
2369
2370         i = udev->descriptor.bMaxPacketSize0 == 0xff?
2371             512 : udev->descriptor.bMaxPacketSize0;
2372         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2373                 if (udev->speed != USB_SPEED_FULL ||
2374                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2375                         dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2376                         retval = -EMSGSIZE;
2377                         goto fail;
2378                 }
2379                 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2380                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2381                 ep0_reinit(udev);
2382         }
2383   
2384         retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2385         if (retval < (signed)sizeof(udev->descriptor)) {
2386                 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2387                         "all", retval);
2388                 if (retval >= 0)
2389                         retval = -ENOMSG;
2390                 goto fail;
2391         }
2392
2393         retval = 0;
2394
2395 fail:
2396         if (retval) {
2397                 hub_port_disable(hub, port1, 0);
2398                 udev->devnum = devnum;  /* for disconnect processing */
2399         }
2400         mutex_unlock(&usb_address0_mutex);
2401         return retval;
2402 }
2403
2404 static void
2405 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2406 {
2407         struct usb_qualifier_descriptor *qual;
2408         int                             status;
2409
2410         qual = kmalloc (sizeof *qual, GFP_KERNEL);
2411         if (qual == NULL)
2412                 return;
2413
2414         status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2415                         qual, sizeof *qual);
2416         if (status == sizeof *qual) {
2417                 dev_info(&udev->dev, "not running at top speed; "
2418                         "connect to a high speed hub\n");
2419                 /* hub LEDs are probably harder to miss than syslog */
2420                 if (hub->has_indicators) {
2421                         hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2422                         schedule_delayed_work (&hub->leds, 0);
2423                 }
2424         }
2425         kfree(qual);
2426 }
2427
2428 static unsigned
2429 hub_power_remaining (struct usb_hub *hub)
2430 {
2431         struct usb_device *hdev = hub->hdev;
2432         int remaining;
2433         int port1;
2434
2435         if (!hub->limited_power)
2436                 return 0;
2437
2438         remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2439         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2440                 struct usb_device       *udev = hdev->children[port1 - 1];
2441                 int                     delta;
2442
2443                 if (!udev)
2444                         continue;
2445
2446                 /* Unconfigured devices may not use more than 100mA,
2447                  * or 8mA for OTG ports */
2448                 if (udev->actconfig)
2449                         delta = udev->actconfig->desc.bMaxPower * 2;
2450                 else if (port1 != udev->bus->otg_port || hdev->parent)
2451                         delta = 100;
2452                 else
2453                         delta = 8;
2454                 if (delta > hub->mA_per_port)
2455                         dev_warn(&udev->dev, "%dmA is over %umA budget "
2456                                         "for port %d!\n",
2457                                         delta, hub->mA_per_port, port1);
2458                 remaining -= delta;
2459         }
2460         if (remaining < 0) {
2461                 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2462                         - remaining);
2463                 remaining = 0;
2464         }
2465         return remaining;
2466 }
2467
2468 /* Handle physical or logical connection change events.
2469  * This routine is called when:
2470  *      a port connection-change occurs;
2471  *      a port enable-change occurs (often caused by EMI);
2472  *      usb_reset_device() encounters changed descriptors (as from
2473  *              a firmware download)
2474  * caller already locked the hub
2475  */
2476 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2477                                         u16 portstatus, u16 portchange)
2478 {
2479         struct usb_device *hdev = hub->hdev;
2480         struct device *hub_dev = hub->intfdev;
2481         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2482         int status, i;
2483  
2484         dev_dbg (hub_dev,
2485                 "port %d, status %04x, change %04x, %s\n",
2486                 port1, portstatus, portchange, portspeed (portstatus));
2487
2488         if (hub->has_indicators) {
2489                 set_port_led(hub, port1, HUB_LED_AUTO);
2490                 hub->indicator[port1-1] = INDICATOR_AUTO;
2491         }
2492  
2493         /* Disconnect any existing devices under this port */
2494         if (hdev->children[port1-1])
2495                 usb_disconnect(&hdev->children[port1-1]);
2496         clear_bit(port1, hub->change_bits);
2497
2498 #ifdef  CONFIG_USB_OTG
2499         /* during HNP, don't repeat the debounce */
2500         if (hdev->bus->is_b_host)
2501                 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2502 #endif
2503
2504         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2505                 status = hub_port_debounce(hub, port1);
2506                 if (status < 0) {
2507                         if (printk_ratelimit())
2508                                 dev_err (hub_dev, "connect-debounce failed, "
2509                                                 "port %d disabled\n", port1);
2510                         goto done;
2511                 }
2512                 portstatus = status;
2513         }
2514
2515         /* Return now if nothing is connected */
2516         if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2517
2518                 /* maybe switch power back on (e.g. root hub was reset) */
2519                 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2520                                 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2521                         set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2522  
2523                 if (portstatus & USB_PORT_STAT_ENABLE)
2524                         goto done;
2525                 return;
2526         }
2527
2528         for (i = 0; i < SET_CONFIG_TRIES; i++) {
2529                 struct usb_device *udev;
2530
2531                 /* reallocate for each attempt, since references
2532                  * to the previous one can escape in various ways
2533                  */
2534                 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2535                 if (!udev) {
2536                         dev_err (hub_dev,
2537                                 "couldn't allocate port %d usb_device\n",
2538                                 port1);
2539                         goto done;
2540                 }
2541
2542                 usb_set_device_state(udev, USB_STATE_POWERED);
2543                 udev->speed = USB_SPEED_UNKNOWN;
2544                 udev->bus_mA = hub->mA_per_port;
2545                 udev->level = hdev->level + 1;
2546
2547                 /* set the address */
2548                 choose_address(udev);
2549                 if (udev->devnum <= 0) {
2550                         status = -ENOTCONN;     /* Don't retry */
2551                         goto loop;
2552                 }
2553
2554                 /* reset and get descriptor */
2555                 status = hub_port_init(hub, udev, port1, i);
2556                 if (status < 0)
2557                         goto loop;
2558
2559                 /* consecutive bus-powered hubs aren't reliable; they can
2560                  * violate the voltage drop budget.  if the new child has
2561                  * a "powered" LED, users should notice we didn't enable it
2562                  * (without reading syslog), even without per-port LEDs
2563                  * on the parent.
2564                  */
2565                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2566                                 && udev->bus_mA <= 100) {
2567                         u16     devstat;
2568
2569                         status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2570                                         &devstat);
2571                         if (status < 2) {
2572                                 dev_dbg(&udev->dev, "get status %d ?\n", status);
2573                                 goto loop_disable;
2574                         }
2575                         le16_to_cpus(&devstat);
2576                         if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2577                                 dev_err(&udev->dev,
2578                                         "can't connect bus-powered hub "
2579                                         "to this port\n");
2580                                 if (hub->has_indicators) {
2581                                         hub->indicator[port1-1] =
2582                                                 INDICATOR_AMBER_BLINK;
2583                                         schedule_delayed_work (&hub->leds, 0);
2584                                 }
2585                                 status = -ENOTCONN;     /* Don't retry */
2586                                 goto loop_disable;
2587                         }
2588                 }
2589  
2590                 /* check for devices running slower than they could */
2591                 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2592                                 && udev->speed == USB_SPEED_FULL
2593                                 && highspeed_hubs != 0)
2594                         check_highspeed (hub, udev, port1);
2595
2596                 /* Store the parent's children[] pointer.  At this point
2597                  * udev becomes globally accessible, although presumably
2598                  * no one will look at it until hdev is unlocked.
2599                  */
2600                 status = 0;
2601
2602                 /* We mustn't add new devices if the parent hub has
2603                  * been disconnected; we would race with the
2604                  * recursively_mark_NOTATTACHED() routine.
2605                  */
2606                 spin_lock_irq(&device_state_lock);
2607                 if (hdev->state == USB_STATE_NOTATTACHED)
2608                         status = -ENOTCONN;
2609                 else
2610                         hdev->children[port1-1] = udev;
2611                 spin_unlock_irq(&device_state_lock);
2612
2613                 /* Run it through the hoops (find a driver, etc) */
2614                 if (!status) {
2615                         status = usb_new_device(udev);
2616                         if (status) {
2617                                 spin_lock_irq(&device_state_lock);
2618                                 hdev->children[port1-1] = NULL;
2619                                 spin_unlock_irq(&device_state_lock);
2620                         }
2621                 }
2622
2623                 if (status)
2624                         goto loop_disable;
2625
2626                 status = hub_power_remaining(hub);
2627                 if (status)
2628                         dev_dbg(hub_dev, "%dmA power budget left\n", status);
2629
2630                 return;
2631
2632 loop_disable:
2633                 hub_port_disable(hub, port1, 1);
2634 loop:
2635                 ep0_reinit(udev);
2636                 release_address(udev);
2637                 usb_put_dev(udev);
2638                 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
2639                         break;
2640         }
2641  
2642 done:
2643         hub_port_disable(hub, port1, 1);
2644 }
2645
2646 static void hub_events(void)
2647 {
2648         struct list_head *tmp;
2649         struct usb_device *hdev;
2650         struct usb_interface *intf;
2651         struct usb_hub *hub;
2652         struct device *hub_dev;
2653         u16 hubstatus;
2654         u16 hubchange;
2655         u16 portstatus;
2656         u16 portchange;
2657         int i, ret;
2658         int connect_change;
2659
2660         /*
2661          *  We restart the list every time to avoid a deadlock with
2662          * deleting hubs downstream from this one. This should be
2663          * safe since we delete the hub from the event list.
2664          * Not the most efficient, but avoids deadlocks.
2665          */
2666         while (1) {
2667
2668                 /* Grab the first entry at the beginning of the list */
2669                 spin_lock_irq(&hub_event_lock);
2670                 if (list_empty(&hub_event_list)) {
2671                         spin_unlock_irq(&hub_event_lock);
2672                         break;
2673                 }
2674
2675                 tmp = hub_event_list.next;
2676                 list_del_init(tmp);
2677
2678                 hub = list_entry(tmp, struct usb_hub, event_list);
2679                 kref_get(&hub->kref);
2680                 spin_unlock_irq(&hub_event_lock);
2681
2682                 hdev = hub->hdev;
2683                 hub_dev = hub->intfdev;
2684                 intf = to_usb_interface(hub_dev);
2685                 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2686                                 hdev->state, hub->descriptor
2687                                         ? hub->descriptor->bNbrPorts
2688                                         : 0,
2689                                 /* NOTE: expects max 15 ports... */
2690                                 (u16) hub->change_bits[0],
2691                                 (u16) hub->event_bits[0]);
2692
2693                 /* Lock the device, then check to see if we were
2694                  * disconnected while waiting for the lock to succeed. */
2695                 usb_lock_device(hdev);
2696                 if (unlikely(hub->disconnected))
2697                         goto loop;
2698
2699                 /* If the hub has died, clean up after it */
2700                 if (hdev->state == USB_STATE_NOTATTACHED) {
2701                         hub->error = -ENODEV;
2702                         hub_pre_reset(intf);
2703                         goto loop;
2704                 }
2705
2706                 /* Autoresume */
2707                 ret = usb_autopm_get_interface(intf);
2708                 if (ret) {
2709                         dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2710                         goto loop;
2711                 }
2712
2713                 /* If this is an inactive hub, do nothing */
2714                 if (hub->quiescing)
2715                         goto loop_autopm;
2716
2717                 if (hub->error) {
2718                         dev_dbg (hub_dev, "resetting for error %d\n",
2719                                 hub->error);
2720
2721                         ret = usb_reset_composite_device(hdev, intf);
2722                         if (ret) {
2723                                 dev_dbg (hub_dev,
2724                                         "error resetting hub: %d\n", ret);
2725                                 goto loop_autopm;
2726                         }
2727
2728                         hub->nerrors = 0;
2729                         hub->error = 0;
2730                 }
2731
2732                 /* deal with port status changes */
2733                 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2734                         if (test_bit(i, hub->busy_bits))
2735                                 continue;
2736                         connect_change = test_bit(i, hub->change_bits);
2737                         if (!test_and_clear_bit(i, hub->event_bits) &&
2738                                         !connect_change && !hub->activating)
2739                                 continue;
2740
2741                         ret = hub_port_status(hub, i,
2742                                         &portstatus, &portchange);
2743                         if (ret < 0)
2744                                 continue;
2745
2746                         if (hub->activating && !hdev->children[i-1] &&
2747                                         (portstatus &
2748                                                 USB_PORT_STAT_CONNECTION))
2749                                 connect_change = 1;
2750
2751                         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2752                                 clear_port_feature(hdev, i,
2753                                         USB_PORT_FEAT_C_CONNECTION);
2754                                 connect_change = 1;
2755                         }
2756
2757                         if (portchange & USB_PORT_STAT_C_ENABLE) {
2758                                 if (!connect_change)
2759                                         dev_dbg (hub_dev,
2760                                                 "port %d enable change, "
2761                                                 "status %08x\n",
2762                                                 i, portstatus);
2763                                 clear_port_feature(hdev, i,
2764                                         USB_PORT_FEAT_C_ENABLE);
2765
2766                                 /*
2767                                  * EM interference sometimes causes badly
2768                                  * shielded USB devices to be shutdown by
2769                                  * the hub, this hack enables them again.
2770                                  * Works at least with mouse driver. 
2771                                  */
2772                                 if (!(portstatus & USB_PORT_STAT_ENABLE)
2773                                     && !connect_change
2774                                     && hdev->children[i-1]) {
2775                                         dev_err (hub_dev,
2776                                             "port %i "
2777                                             "disabled by hub (EMI?), "
2778                                             "re-enabling...\n",
2779                                                 i);
2780                                         connect_change = 1;
2781                                 }
2782                         }
2783
2784                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2785                                 clear_port_feature(hdev, i,
2786                                         USB_PORT_FEAT_C_SUSPEND);
2787                                 if (hdev->children[i-1]) {
2788                                         ret = remote_wakeup(hdev->
2789                                                         children[i-1]);
2790                                         if (ret < 0)
2791                                                 connect_change = 1;
2792                                 } else {
2793                                         ret = -ENODEV;
2794                                         hub_port_disable(hub, i, 1);
2795                                 }
2796                                 dev_dbg (hub_dev,
2797                                         "resume on port %d, status %d\n",
2798                                         i, ret);
2799                         }
2800                         
2801                         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2802                                 dev_err (hub_dev,
2803                                         "over-current change on port %d\n",
2804                                         i);
2805                                 clear_port_feature(hdev, i,
2806                                         USB_PORT_FEAT_C_OVER_CURRENT);
2807                                 hub_power_on(hub);
2808                         }
2809
2810                         if (portchange & USB_PORT_STAT_C_RESET) {
2811                                 dev_dbg (hub_dev,
2812                                         "reset change on port %d\n",
2813                                         i);
2814                                 clear_port_feature(hdev, i,
2815                                         USB_PORT_FEAT_C_RESET);
2816                         }
2817
2818                         if (connect_change)
2819                                 hub_port_connect_change(hub, i,
2820                                                 portstatus, portchange);
2821                 } /* end for i */
2822
2823                 /* deal with hub status changes */
2824                 if (test_and_clear_bit(0, hub->event_bits) == 0)
2825                         ;       /* do nothing */
2826                 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2827                         dev_err (hub_dev, "get_hub_status failed\n");
2828                 else {
2829                         if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2830                                 dev_dbg (hub_dev, "power change\n");
2831                                 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2832                                 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2833                                         /* FIXME: Is this always true? */
2834                                         hub->limited_power = 1;
2835                                 else
2836                                         hub->limited_power = 0;
2837                         }
2838                         if (hubchange & HUB_CHANGE_OVERCURRENT) {
2839                                 dev_dbg (hub_dev, "overcurrent change\n");
2840                                 msleep(500);    /* Cool down */
2841                                 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2842                                 hub_power_on(hub);
2843                         }
2844                 }
2845
2846                 hub->activating = 0;
2847
2848                 /* If this is a root hub, tell the HCD it's okay to
2849                  * re-enable port-change interrupts now. */
2850                 if (!hdev->parent && !hub->busy_bits[0])
2851                         usb_enable_root_hub_irq(hdev->bus);
2852
2853 loop_autopm:
2854                 /* Allow autosuspend if we're not going to run again */
2855                 if (list_empty(&hub->event_list))
2856                         usb_autopm_enable(intf);
2857 loop:
2858                 usb_unlock_device(hdev);
2859                 kref_put(&hub->kref, hub_release);
2860
2861         } /* end while (1) */
2862 }
2863
2864 static int hub_thread(void *__unused)
2865 {
2866         set_freezable();
2867         do {
2868                 hub_events();
2869                 wait_event_interruptible(khubd_wait,
2870                                 !list_empty(&hub_event_list) ||
2871                                 kthread_should_stop());
2872                 try_to_freeze();
2873         } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2874
2875         pr_debug("%s: khubd exiting\n", usbcore_name);
2876         return 0;
2877 }
2878
2879 static struct usb_device_id hub_id_table [] = {
2880     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2881       .bDeviceClass = USB_CLASS_HUB},
2882     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2883       .bInterfaceClass = USB_CLASS_HUB},
2884     { }                                         /* Terminating entry */
2885 };
2886
2887 MODULE_DEVICE_TABLE (usb, hub_id_table);
2888
2889 static struct usb_driver hub_driver = {
2890         .name =         "hub",
2891         .probe =        hub_probe,
2892         .disconnect =   hub_disconnect,
2893         .suspend =      hub_suspend,
2894         .resume =       hub_resume,
2895         .reset_resume = hub_reset_resume,
2896         .pre_reset =    hub_pre_reset,
2897         .post_reset =   hub_post_reset,
2898         .ioctl =        hub_ioctl,
2899         .id_table =     hub_id_table,
2900         .supports_autosuspend = 1,
2901 };
2902
2903 int usb_hub_init(void)
2904 {
2905         if (usb_register(&hub_driver) < 0) {
2906                 printk(KERN_ERR "%s: can't register hub driver\n",
2907                         usbcore_name);
2908                 return -1;
2909         }
2910
2911         khubd_task = kthread_run(hub_thread, NULL, "khubd");
2912         if (!IS_ERR(khubd_task))
2913                 return 0;
2914
2915         /* Fall through if kernel_thread failed */
2916         usb_deregister(&hub_driver);
2917         printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2918
2919         return -1;
2920 }
2921
2922 void usb_hub_cleanup(void)
2923 {
2924         kthread_stop(khubd_task);
2925
2926         /*
2927          * Hub resources are freed for us by usb_deregister. It calls
2928          * usb_driver_purge on every device which in turn calls that
2929          * devices disconnect function if it is using this driver.
2930          * The hub_disconnect function takes care of releasing the
2931          * individual hub resources. -greg
2932          */
2933         usb_deregister(&hub_driver);
2934 } /* usb_hub_cleanup() */
2935
2936 static int config_descriptors_changed(struct usb_device *udev)
2937 {
2938         unsigned                        index;
2939         unsigned                        len = 0;
2940         struct usb_config_descriptor    *buf;
2941
2942         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2943                 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2944                         len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2945         }
2946         buf = kmalloc (len, GFP_KERNEL);
2947         if (buf == NULL) {
2948                 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2949                 /* assume the worst */
2950                 return 1;
2951         }
2952         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2953                 int length;
2954                 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2955
2956                 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2957                                 old_length);
2958                 if (length < old_length) {
2959                         dev_dbg(&udev->dev, "config index %d, error %d\n",
2960                                         index, length);
2961                         break;
2962                 }
2963                 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2964                                 != 0) {
2965                         dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2966                                 index, buf->bConfigurationValue);
2967                         break;
2968                 }
2969         }
2970         kfree(buf);
2971         return index != udev->descriptor.bNumConfigurations;
2972 }
2973
2974 /**
2975  * usb_reset_device - perform a USB port reset to reinitialize a device
2976  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2977  *
2978  * WARNING - don't use this routine to reset a composite device
2979  * (one with multiple interfaces owned by separate drivers)!
2980  * Use usb_reset_composite_device() instead.
2981  *
2982  * Do a port reset, reassign the device's address, and establish its
2983  * former operating configuration.  If the reset fails, or the device's
2984  * descriptors change from their values before the reset, or the original
2985  * configuration and altsettings cannot be restored, a flag will be set
2986  * telling khubd to pretend the device has been disconnected and then
2987  * re-connected.  All drivers will be unbound, and the device will be
2988  * re-enumerated and probed all over again.
2989  *
2990  * Returns 0 if the reset succeeded, -ENODEV if the device has been
2991  * flagged for logical disconnection, or some other negative error code
2992  * if the reset wasn't even attempted.
2993  *
2994  * The caller must own the device lock.  For example, it's safe to use
2995  * this from a driver probe() routine after downloading new firmware.
2996  * For calls that might not occur during probe(), drivers should lock
2997  * the device using usb_lock_device_for_reset().
2998  *
2999  * Locking exception: This routine may also be called from within an
3000  * autoresume handler.  Such usage won't conflict with other tasks
3001  * holding the device lock because these tasks should always call
3002  * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3003  */
3004 int usb_reset_device(struct usb_device *udev)
3005 {
3006         struct usb_device               *parent_hdev = udev->parent;
3007         struct usb_hub                  *parent_hub;
3008         struct usb_device_descriptor    descriptor = udev->descriptor;
3009         int                             i, ret = 0;
3010         int                             port1 = udev->portnum;
3011
3012         if (udev->state == USB_STATE_NOTATTACHED ||
3013                         udev->state == USB_STATE_SUSPENDED) {
3014                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3015                                 udev->state);
3016                 return -EINVAL;
3017         }
3018
3019         if (!parent_hdev) {
3020                 /* this requires hcd-specific logic; see OHCI hc_restart() */
3021                 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
3022                 return -EISDIR;
3023         }
3024         parent_hub = hdev_to_hub(parent_hdev);
3025
3026         set_bit(port1, parent_hub->busy_bits);
3027         for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3028
3029                 /* ep0 maxpacket size may change; let the HCD know about it.
3030                  * Other endpoints will be handled by re-enumeration. */
3031                 ep0_reinit(udev);
3032                 ret = hub_port_init(parent_hub, udev, port1, i);
3033                 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
3034                         break;
3035         }
3036         clear_bit(port1, parent_hub->busy_bits);
3037         if (!parent_hdev->parent && !parent_hub->busy_bits[0])
3038                 usb_enable_root_hub_irq(parent_hdev->bus);
3039
3040         if (ret < 0)
3041                 goto re_enumerate;
3042  
3043         /* Device might have changed firmware (DFU or similar) */
3044         if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3045                         || config_descriptors_changed (udev)) {
3046                 dev_info(&udev->dev, "device firmware changed\n");
3047                 udev->descriptor = descriptor;  /* for disconnect() calls */
3048                 goto re_enumerate;
3049         }
3050   
3051         if (!udev->actconfig)
3052                 goto done;
3053
3054         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3055                         USB_REQ_SET_CONFIGURATION, 0,
3056                         udev->actconfig->desc.bConfigurationValue, 0,
3057                         NULL, 0, USB_CTRL_SET_TIMEOUT);
3058         if (ret < 0) {
3059                 dev_err(&udev->dev,
3060                         "can't restore configuration #%d (error=%d)\n",
3061                         udev->actconfig->desc.bConfigurationValue, ret);
3062                 goto re_enumerate;
3063         }
3064         usb_set_device_state(udev, USB_STATE_CONFIGURED);
3065
3066         for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3067                 struct usb_interface *intf = udev->actconfig->interface[i];
3068                 struct usb_interface_descriptor *desc;
3069
3070                 /* set_interface resets host side toggle even
3071                  * for altsetting zero.  the interface may have no driver.
3072                  */
3073                 desc = &intf->cur_altsetting->desc;
3074                 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3075                         desc->bAlternateSetting);
3076                 if (ret < 0) {
3077                         dev_err(&udev->dev, "failed to restore interface %d "
3078                                 "altsetting %d (error=%d)\n",
3079                                 desc->bInterfaceNumber,
3080                                 desc->bAlternateSetting,
3081                                 ret);
3082                         goto re_enumerate;
3083                 }
3084         }
3085
3086 done:
3087         return 0;
3088  
3089 re_enumerate:
3090         hub_port_logical_disconnect(parent_hub, port1);
3091         return -ENODEV;
3092 }
3093 EXPORT_SYMBOL(usb_reset_device);
3094
3095 /**
3096  * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3097  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3098  * @iface: interface bound to the driver making the request (optional)
3099  *
3100  * Warns all drivers bound to registered interfaces (using their pre_reset
3101  * method), performs the port reset, and then lets the drivers know that
3102  * the reset is over (using their post_reset method).
3103  *
3104  * Return value is the same as for usb_reset_device().
3105  *
3106  * The caller must own the device lock.  For example, it's safe to use
3107  * this from a driver probe() routine after downloading new firmware.
3108  * For calls that might not occur during probe(), drivers should lock
3109  * the device using usb_lock_device_for_reset().
3110  *
3111  * The interface locks are acquired during the pre_reset stage and released
3112  * during the post_reset stage.  However if iface is not NULL and is
3113  * currently being probed, we assume that the caller already owns its
3114  * lock.
3115  */
3116 int usb_reset_composite_device(struct usb_device *udev,
3117                 struct usb_interface *iface)
3118 {
3119         int ret;
3120         struct usb_host_config *config = udev->actconfig;
3121
3122         if (udev->state == USB_STATE_NOTATTACHED ||
3123                         udev->state == USB_STATE_SUSPENDED) {
3124                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3125                                 udev->state);
3126                 return -EINVAL;
3127         }
3128
3129         /* Prevent autosuspend during the reset */
3130         usb_autoresume_device(udev);
3131
3132         if (iface && iface->condition != USB_INTERFACE_BINDING)
3133                 iface = NULL;
3134
3135         if (config) {
3136                 int i;
3137                 struct usb_interface *cintf;
3138                 struct usb_driver *drv;
3139
3140                 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3141                         cintf = config->interface[i];
3142                         if (cintf != iface)
3143                                 down(&cintf->dev.sem);
3144                         if (device_is_registered(&cintf->dev) &&
3145                                         cintf->dev.driver) {
3146                                 drv = to_usb_driver(cintf->dev.driver);
3147                                 if (drv->pre_reset)
3148                                         (drv->pre_reset)(cintf);
3149         /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3150                         }
3151                 }
3152         }
3153
3154         ret = usb_reset_device(udev);
3155
3156         if (config) {
3157                 int i;
3158                 struct usb_interface *cintf;
3159                 struct usb_driver *drv;
3160
3161                 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3162                         cintf = config->interface[i];
3163                         if (device_is_registered(&cintf->dev) &&
3164                                         cintf->dev.driver) {
3165                                 drv = to_usb_driver(cintf->dev.driver);
3166                                 if (drv->post_reset)
3167                                         (drv->post_reset)(cintf);
3168         /* FIXME: Unbind if post_reset returns an error or isn't defined */
3169                         }
3170                         if (cintf != iface)
3171                                 up(&cintf->dev.sem);
3172                 }
3173         }
3174
3175         usb_autosuspend_device(udev);
3176         return ret;
3177 }
3178 EXPORT_SYMBOL(usb_reset_composite_device);