Merge branch 'drm-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied...
[linux-2.6] / drivers / usb / core / hub.c
1 /*
2  * USB hub driver.
3  *
4  * (C) Copyright 1999 Linus Torvalds
5  * (C) Copyright 1999 Johannes Erdfelt
6  * (C) Copyright 1999 Gregory P. Smith
7  * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8  *
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/smp_lock.h>
20 #include <linux/ioctl.h>
21 #include <linux/usb.h>
22 #include <linux/usbdevice_fs.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
25 #include <linux/freezer.h>
26
27 #include <asm/semaphore.h>
28 #include <asm/uaccess.h>
29 #include <asm/byteorder.h>
30
31 #include "usb.h"
32 #include "hcd.h"
33 #include "hub.h"
34
35 struct usb_hub {
36         struct device           *intfdev;       /* the "interface" device */
37         struct usb_device       *hdev;
38         struct urb              *urb;           /* for interrupt polling pipe */
39
40         /* buffer for urb ... with extra space in case of babble */
41         char                    (*buffer)[8];
42         dma_addr_t              buffer_dma;     /* DMA address for buffer */
43         union {
44                 struct usb_hub_status   hub;
45                 struct usb_port_status  port;
46         }                       *status;        /* buffer for status reports */
47         struct mutex            status_mutex;   /* for the status buffer */
48
49         int                     error;          /* last reported error */
50         int                     nerrors;        /* track consecutive errors */
51
52         struct list_head        event_list;     /* hubs w/data or errs ready */
53         unsigned long           event_bits[1];  /* status change bitmask */
54         unsigned long           change_bits[1]; /* ports with logical connect
55                                                         status change */
56         unsigned long           busy_bits[1];   /* ports being reset or
57                                                         resumed */
58 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
59 #error event_bits[] is too short!
60 #endif
61
62         struct usb_hub_descriptor *descriptor;  /* class descriptor */
63         struct usb_tt           tt;             /* Transaction Translator */
64
65         unsigned                mA_per_port;    /* current for each child */
66
67         unsigned                limited_power:1;
68         unsigned                quiescing:1;
69         unsigned                activating:1;
70
71         unsigned                has_indicators:1;
72         u8                      indicator[USB_MAXCHILDREN];
73         struct delayed_work     leds;
74 };
75
76
77 /* Protect struct usb_device->state and ->children members
78  * Note: Both are also protected by ->dev.sem, except that ->state can
79  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
80 static DEFINE_SPINLOCK(device_state_lock);
81
82 /* khubd's worklist and its lock */
83 static DEFINE_SPINLOCK(hub_event_lock);
84 static LIST_HEAD(hub_event_list);       /* List of hubs needing servicing */
85
86 /* Wakes up khubd */
87 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
88
89 static struct task_struct *khubd_task;
90
91 /* cycle leds on hubs that aren't blinking for attention */
92 static int blinkenlights = 0;
93 module_param (blinkenlights, bool, S_IRUGO);
94 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
95
96 /*
97  * As of 2.6.10 we introduce a new USB device initialization scheme which
98  * closely resembles the way Windows works.  Hopefully it will be compatible
99  * with a wider range of devices than the old scheme.  However some previously
100  * working devices may start giving rise to "device not accepting address"
101  * errors; if that happens the user can try the old scheme by adjusting the
102  * following module parameters.
103  *
104  * For maximum flexibility there are two boolean parameters to control the
105  * hub driver's behavior.  On the first initialization attempt, if the
106  * "old_scheme_first" parameter is set then the old scheme will be used,
107  * otherwise the new scheme is used.  If that fails and "use_both_schemes"
108  * is set, then the driver will make another attempt, using the other scheme.
109  */
110 static int old_scheme_first = 0;
111 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
112 MODULE_PARM_DESC(old_scheme_first,
113                  "start with the old device initialization scheme");
114
115 static int use_both_schemes = 1;
116 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(use_both_schemes,
118                 "try the other device initialization scheme if the "
119                 "first one fails");
120
121
122 static inline char *portspeed(int portstatus)
123 {
124         if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
125                 return "480 Mb/s";
126         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
127                 return "1.5 Mb/s";
128         else
129                 return "12 Mb/s";
130 }
131
132 /* Note that hdev or one of its children must be locked! */
133 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
134 {
135         return usb_get_intfdata(hdev->actconfig->interface[0]);
136 }
137
138 /* USB 2.0 spec Section 11.24.4.5 */
139 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
140 {
141         int i, ret;
142
143         for (i = 0; i < 3; i++) {
144                 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
145                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
146                         USB_DT_HUB << 8, 0, data, size,
147                         USB_CTRL_GET_TIMEOUT);
148                 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
149                         return ret;
150         }
151         return -EINVAL;
152 }
153
154 /*
155  * USB 2.0 spec Section 11.24.2.1
156  */
157 static int clear_hub_feature(struct usb_device *hdev, int feature)
158 {
159         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
160                 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
161 }
162
163 /*
164  * USB 2.0 spec Section 11.24.2.2
165  */
166 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
167 {
168         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
169                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
170                 NULL, 0, 1000);
171 }
172
173 /*
174  * USB 2.0 spec Section 11.24.2.13
175  */
176 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
177 {
178         return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
179                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
180                 NULL, 0, 1000);
181 }
182
183 /*
184  * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
185  * for info about using port indicators
186  */
187 static void set_port_led(
188         struct usb_hub *hub,
189         int port1,
190         int selector
191 )
192 {
193         int status = set_port_feature(hub->hdev, (selector << 8) | port1,
194                         USB_PORT_FEAT_INDICATOR);
195         if (status < 0)
196                 dev_dbg (hub->intfdev,
197                         "port %d indicator %s status %d\n",
198                         port1,
199                         ({ char *s; switch (selector) {
200                         case HUB_LED_AMBER: s = "amber"; break;
201                         case HUB_LED_GREEN: s = "green"; break;
202                         case HUB_LED_OFF: s = "off"; break;
203                         case HUB_LED_AUTO: s = "auto"; break;
204                         default: s = "??"; break;
205                         }; s; }),
206                         status);
207 }
208
209 #define LED_CYCLE_PERIOD        ((2*HZ)/3)
210
211 static void led_work (struct work_struct *work)
212 {
213         struct usb_hub          *hub =
214                 container_of(work, struct usb_hub, leds.work);
215         struct usb_device       *hdev = hub->hdev;
216         unsigned                i;
217         unsigned                changed = 0;
218         int                     cursor = -1;
219
220         if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
221                 return;
222
223         for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
224                 unsigned        selector, mode;
225
226                 /* 30%-50% duty cycle */
227
228                 switch (hub->indicator[i]) {
229                 /* cycle marker */
230                 case INDICATOR_CYCLE:
231                         cursor = i;
232                         selector = HUB_LED_AUTO;
233                         mode = INDICATOR_AUTO;
234                         break;
235                 /* blinking green = sw attention */
236                 case INDICATOR_GREEN_BLINK:
237                         selector = HUB_LED_GREEN;
238                         mode = INDICATOR_GREEN_BLINK_OFF;
239                         break;
240                 case INDICATOR_GREEN_BLINK_OFF:
241                         selector = HUB_LED_OFF;
242                         mode = INDICATOR_GREEN_BLINK;
243                         break;
244                 /* blinking amber = hw attention */
245                 case INDICATOR_AMBER_BLINK:
246                         selector = HUB_LED_AMBER;
247                         mode = INDICATOR_AMBER_BLINK_OFF;
248                         break;
249                 case INDICATOR_AMBER_BLINK_OFF:
250                         selector = HUB_LED_OFF;
251                         mode = INDICATOR_AMBER_BLINK;
252                         break;
253                 /* blink green/amber = reserved */
254                 case INDICATOR_ALT_BLINK:
255                         selector = HUB_LED_GREEN;
256                         mode = INDICATOR_ALT_BLINK_OFF;
257                         break;
258                 case INDICATOR_ALT_BLINK_OFF:
259                         selector = HUB_LED_AMBER;
260                         mode = INDICATOR_ALT_BLINK;
261                         break;
262                 default:
263                         continue;
264                 }
265                 if (selector != HUB_LED_AUTO)
266                         changed = 1;
267                 set_port_led(hub, i + 1, selector);
268                 hub->indicator[i] = mode;
269         }
270         if (!changed && blinkenlights) {
271                 cursor++;
272                 cursor %= hub->descriptor->bNbrPorts;
273                 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
274                 hub->indicator[cursor] = INDICATOR_CYCLE;
275                 changed++;
276         }
277         if (changed)
278                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
279 }
280
281 /* use a short timeout for hub/port status fetches */
282 #define USB_STS_TIMEOUT         1000
283 #define USB_STS_RETRIES         5
284
285 /*
286  * USB 2.0 spec Section 11.24.2.6
287  */
288 static int get_hub_status(struct usb_device *hdev,
289                 struct usb_hub_status *data)
290 {
291         int i, status = -ETIMEDOUT;
292
293         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
294                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
295                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
296                         data, sizeof(*data), USB_STS_TIMEOUT);
297         }
298         return status;
299 }
300
301 /*
302  * USB 2.0 spec Section 11.24.2.7
303  */
304 static int get_port_status(struct usb_device *hdev, int port1,
305                 struct usb_port_status *data)
306 {
307         int i, status = -ETIMEDOUT;
308
309         for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
310                 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
311                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
312                         data, sizeof(*data), USB_STS_TIMEOUT);
313         }
314         return status;
315 }
316
317 static void kick_khubd(struct usb_hub *hub)
318 {
319         unsigned long   flags;
320
321         /* Suppress autosuspend until khubd runs */
322         to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
323
324         spin_lock_irqsave(&hub_event_lock, flags);
325         if (list_empty(&hub->event_list)) {
326                 list_add_tail(&hub->event_list, &hub_event_list);
327                 wake_up(&khubd_wait);
328         }
329         spin_unlock_irqrestore(&hub_event_lock, flags);
330 }
331
332 void usb_kick_khubd(struct usb_device *hdev)
333 {
334         kick_khubd(hdev_to_hub(hdev));
335 }
336
337
338 /* completion function, fires on port status changes and various faults */
339 static void hub_irq(struct urb *urb)
340 {
341         struct usb_hub *hub = urb->context;
342         int status;
343         int i;
344         unsigned long bits;
345
346         switch (urb->status) {
347         case -ENOENT:           /* synchronous unlink */
348         case -ECONNRESET:       /* async unlink */
349         case -ESHUTDOWN:        /* hardware going away */
350                 return;
351
352         default:                /* presumably an error */
353                 /* Cause a hub reset after 10 consecutive errors */
354                 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
355                 if ((++hub->nerrors < 10) || hub->error)
356                         goto resubmit;
357                 hub->error = urb->status;
358                 /* FALL THROUGH */
359
360         /* let khubd handle things */
361         case 0:                 /* we got data:  port status changed */
362                 bits = 0;
363                 for (i = 0; i < urb->actual_length; ++i)
364                         bits |= ((unsigned long) ((*hub->buffer)[i]))
365                                         << (i*8);
366                 hub->event_bits[0] = bits;
367                 break;
368         }
369
370         hub->nerrors = 0;
371
372         /* Something happened, let khubd figure it out */
373         kick_khubd(hub);
374
375 resubmit:
376         if (hub->quiescing)
377                 return;
378
379         if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
380                         && status != -ENODEV && status != -EPERM)
381                 dev_err (hub->intfdev, "resubmit --> %d\n", status);
382 }
383
384 /* USB 2.0 spec Section 11.24.2.3 */
385 static inline int
386 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
387 {
388         return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
389                                HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
390                                tt, NULL, 0, 1000);
391 }
392
393 /*
394  * enumeration blocks khubd for a long time. we use keventd instead, since
395  * long blocking there is the exception, not the rule.  accordingly, HCDs
396  * talking to TTs must queue control transfers (not just bulk and iso), so
397  * both can talk to the same hub concurrently.
398  */
399 static void hub_tt_kevent (struct work_struct *work)
400 {
401         struct usb_hub          *hub =
402                 container_of(work, struct usb_hub, tt.kevent);
403         unsigned long           flags;
404
405         spin_lock_irqsave (&hub->tt.lock, flags);
406         while (!list_empty (&hub->tt.clear_list)) {
407                 struct list_head        *temp;
408                 struct usb_tt_clear     *clear;
409                 struct usb_device       *hdev = hub->hdev;
410                 int                     status;
411
412                 temp = hub->tt.clear_list.next;
413                 clear = list_entry (temp, struct usb_tt_clear, clear_list);
414                 list_del (&clear->clear_list);
415
416                 /* drop lock so HCD can concurrently report other TT errors */
417                 spin_unlock_irqrestore (&hub->tt.lock, flags);
418                 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
419                 spin_lock_irqsave (&hub->tt.lock, flags);
420
421                 if (status)
422                         dev_err (&hdev->dev,
423                                 "clear tt %d (%04x) error %d\n",
424                                 clear->tt, clear->devinfo, status);
425                 kfree(clear);
426         }
427         spin_unlock_irqrestore (&hub->tt.lock, flags);
428 }
429
430 /**
431  * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
432  * @udev: the device whose split transaction failed
433  * @pipe: identifies the endpoint of the failed transaction
434  *
435  * High speed HCDs use this to tell the hub driver that some split control or
436  * bulk transaction failed in a way that requires clearing internal state of
437  * a transaction translator.  This is normally detected (and reported) from
438  * interrupt context.
439  *
440  * It may not be possible for that hub to handle additional full (or low)
441  * speed transactions until that state is fully cleared out.
442  */
443 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
444 {
445         struct usb_tt           *tt = udev->tt;
446         unsigned long           flags;
447         struct usb_tt_clear     *clear;
448
449         /* we've got to cope with an arbitrary number of pending TT clears,
450          * since each TT has "at least two" buffers that can need it (and
451          * there can be many TTs per hub).  even if they're uncommon.
452          */
453         if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
454                 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
455                 /* FIXME recover somehow ... RESET_TT? */
456                 return;
457         }
458
459         /* info that CLEAR_TT_BUFFER needs */
460         clear->tt = tt->multi ? udev->ttport : 1;
461         clear->devinfo = usb_pipeendpoint (pipe);
462         clear->devinfo |= udev->devnum << 4;
463         clear->devinfo |= usb_pipecontrol (pipe)
464                         ? (USB_ENDPOINT_XFER_CONTROL << 11)
465                         : (USB_ENDPOINT_XFER_BULK << 11);
466         if (usb_pipein (pipe))
467                 clear->devinfo |= 1 << 15;
468         
469         /* tell keventd to clear state for this TT */
470         spin_lock_irqsave (&tt->lock, flags);
471         list_add_tail (&clear->clear_list, &tt->clear_list);
472         schedule_work (&tt->kevent);
473         spin_unlock_irqrestore (&tt->lock, flags);
474 }
475
476 static void hub_power_on(struct usb_hub *hub)
477 {
478         int port1;
479         unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
480         u16 wHubCharacteristics =
481                         le16_to_cpu(hub->descriptor->wHubCharacteristics);
482
483         /* Enable power on each port.  Some hubs have reserved values
484          * of LPSM (> 2) in their descriptors, even though they are
485          * USB 2.0 hubs.  Some hubs do not implement port-power switching
486          * but only emulate it.  In all cases, the ports won't work
487          * unless we send these messages to the hub.
488          */
489         if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
490                 dev_dbg(hub->intfdev, "enabling power on all ports\n");
491         else
492                 dev_dbg(hub->intfdev, "trying to enable port power on "
493                                 "non-switchable hub\n");
494         for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
495                 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
496
497         /* Wait at least 100 msec for power to become stable */
498         msleep(max(pgood_delay, (unsigned) 100));
499 }
500
501 static void hub_quiesce(struct usb_hub *hub)
502 {
503         /* (nonblocking) khubd and related activity won't re-trigger */
504         hub->quiescing = 1;
505         hub->activating = 0;
506
507         /* (blocking) stop khubd and related activity */
508         usb_kill_urb(hub->urb);
509         if (hub->has_indicators)
510                 cancel_delayed_work(&hub->leds);
511         if (hub->has_indicators || hub->tt.hub)
512                 flush_scheduled_work();
513 }
514
515 static void hub_activate(struct usb_hub *hub)
516 {
517         int     status;
518
519         hub->quiescing = 0;
520         hub->activating = 1;
521
522         status = usb_submit_urb(hub->urb, GFP_NOIO);
523         if (status < 0)
524                 dev_err(hub->intfdev, "activate --> %d\n", status);
525         if (hub->has_indicators && blinkenlights)
526                 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
527
528         /* scan all ports ASAP */
529         kick_khubd(hub);
530 }
531
532 static int hub_hub_status(struct usb_hub *hub,
533                 u16 *status, u16 *change)
534 {
535         int ret;
536
537         mutex_lock(&hub->status_mutex);
538         ret = get_hub_status(hub->hdev, &hub->status->hub);
539         if (ret < 0)
540                 dev_err (hub->intfdev,
541                         "%s failed (err = %d)\n", __FUNCTION__, ret);
542         else {
543                 *status = le16_to_cpu(hub->status->hub.wHubStatus);
544                 *change = le16_to_cpu(hub->status->hub.wHubChange); 
545                 ret = 0;
546         }
547         mutex_unlock(&hub->status_mutex);
548         return ret;
549 }
550
551 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
552 {
553         struct usb_device *hdev = hub->hdev;
554         int ret;
555
556         if (hdev->children[port1-1] && set_state) {
557                 usb_set_device_state(hdev->children[port1-1],
558                                 USB_STATE_NOTATTACHED);
559         }
560         ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
561         if (ret)
562                 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
563                         port1, ret);
564
565         return ret;
566 }
567
568
569 /* caller has locked the hub device */
570 static void hub_pre_reset(struct usb_interface *intf)
571 {
572         struct usb_hub *hub = usb_get_intfdata(intf);
573         struct usb_device *hdev = hub->hdev;
574         int port1;
575
576         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
577                 if (hdev->children[port1 - 1]) {
578                         usb_disconnect(&hdev->children[port1 - 1]);
579                         if (hub->error == 0)
580                                 hub_port_disable(hub, port1, 0);
581                 }
582         }
583         hub_quiesce(hub);
584 }
585
586 /* caller has locked the hub device */
587 static void hub_post_reset(struct usb_interface *intf)
588 {
589         struct usb_hub *hub = usb_get_intfdata(intf);
590
591         hub_activate(hub);
592         hub_power_on(hub);
593 }
594
595
596 static int hub_configure(struct usb_hub *hub,
597         struct usb_endpoint_descriptor *endpoint)
598 {
599         struct usb_device *hdev = hub->hdev;
600         struct device *hub_dev = hub->intfdev;
601         u16 hubstatus, hubchange;
602         u16 wHubCharacteristics;
603         unsigned int pipe;
604         int maxp, ret;
605         char *message;
606
607         hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
608                         &hub->buffer_dma);
609         if (!hub->buffer) {
610                 message = "can't allocate hub irq buffer";
611                 ret = -ENOMEM;
612                 goto fail;
613         }
614
615         hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
616         if (!hub->status) {
617                 message = "can't kmalloc hub status buffer";
618                 ret = -ENOMEM;
619                 goto fail;
620         }
621         mutex_init(&hub->status_mutex);
622
623         hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
624         if (!hub->descriptor) {
625                 message = "can't kmalloc hub descriptor";
626                 ret = -ENOMEM;
627                 goto fail;
628         }
629
630         /* Request the entire hub descriptor.
631          * hub->descriptor can handle USB_MAXCHILDREN ports,
632          * but the hub can/will return fewer bytes here.
633          */
634         ret = get_hub_descriptor(hdev, hub->descriptor,
635                         sizeof(*hub->descriptor));
636         if (ret < 0) {
637                 message = "can't read hub descriptor";
638                 goto fail;
639         } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
640                 message = "hub has too many ports!";
641                 ret = -ENODEV;
642                 goto fail;
643         }
644
645         hdev->maxchild = hub->descriptor->bNbrPorts;
646         dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
647                 (hdev->maxchild == 1) ? "" : "s");
648
649         wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
650
651         if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
652                 int     i;
653                 char    portstr [USB_MAXCHILDREN + 1];
654
655                 for (i = 0; i < hdev->maxchild; i++)
656                         portstr[i] = hub->descriptor->DeviceRemovable
657                                     [((i + 1) / 8)] & (1 << ((i + 1) % 8))
658                                 ? 'F' : 'R';
659                 portstr[hdev->maxchild] = 0;
660                 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
661         } else
662                 dev_dbg(hub_dev, "standalone hub\n");
663
664         switch (wHubCharacteristics & HUB_CHAR_LPSM) {
665                 case 0x00:
666                         dev_dbg(hub_dev, "ganged power switching\n");
667                         break;
668                 case 0x01:
669                         dev_dbg(hub_dev, "individual port power switching\n");
670                         break;
671                 case 0x02:
672                 case 0x03:
673                         dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
674                         break;
675         }
676
677         switch (wHubCharacteristics & HUB_CHAR_OCPM) {
678                 case 0x00:
679                         dev_dbg(hub_dev, "global over-current protection\n");
680                         break;
681                 case 0x08:
682                         dev_dbg(hub_dev, "individual port over-current protection\n");
683                         break;
684                 case 0x10:
685                 case 0x18:
686                         dev_dbg(hub_dev, "no over-current protection\n");
687                         break;
688         }
689
690         spin_lock_init (&hub->tt.lock);
691         INIT_LIST_HEAD (&hub->tt.clear_list);
692         INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
693         switch (hdev->descriptor.bDeviceProtocol) {
694                 case 0:
695                         break;
696                 case 1:
697                         dev_dbg(hub_dev, "Single TT\n");
698                         hub->tt.hub = hdev;
699                         break;
700                 case 2:
701                         ret = usb_set_interface(hdev, 0, 1);
702                         if (ret == 0) {
703                                 dev_dbg(hub_dev, "TT per port\n");
704                                 hub->tt.multi = 1;
705                         } else
706                                 dev_err(hub_dev, "Using single TT (err %d)\n",
707                                         ret);
708                         hub->tt.hub = hdev;
709                         break;
710                 default:
711                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
712                                 hdev->descriptor.bDeviceProtocol);
713                         break;
714         }
715
716         /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
717         switch (wHubCharacteristics & HUB_CHAR_TTTT) {
718                 case HUB_TTTT_8_BITS:
719                         if (hdev->descriptor.bDeviceProtocol != 0) {
720                                 hub->tt.think_time = 666;
721                                 dev_dbg(hub_dev, "TT requires at most %d "
722                                                 "FS bit times (%d ns)\n",
723                                         8, hub->tt.think_time);
724                         }
725                         break;
726                 case HUB_TTTT_16_BITS:
727                         hub->tt.think_time = 666 * 2;
728                         dev_dbg(hub_dev, "TT requires at most %d "
729                                         "FS bit times (%d ns)\n",
730                                 16, hub->tt.think_time);
731                         break;
732                 case HUB_TTTT_24_BITS:
733                         hub->tt.think_time = 666 * 3;
734                         dev_dbg(hub_dev, "TT requires at most %d "
735                                         "FS bit times (%d ns)\n",
736                                 24, hub->tt.think_time);
737                         break;
738                 case HUB_TTTT_32_BITS:
739                         hub->tt.think_time = 666 * 4;
740                         dev_dbg(hub_dev, "TT requires at most %d "
741                                         "FS bit times (%d ns)\n",
742                                 32, hub->tt.think_time);
743                         break;
744         }
745
746         /* probe() zeroes hub->indicator[] */
747         if (wHubCharacteristics & HUB_CHAR_PORTIND) {
748                 hub->has_indicators = 1;
749                 dev_dbg(hub_dev, "Port indicators are supported\n");
750         }
751
752         dev_dbg(hub_dev, "power on to power good time: %dms\n",
753                 hub->descriptor->bPwrOn2PwrGood * 2);
754
755         /* power budgeting mostly matters with bus-powered hubs,
756          * and battery-powered root hubs (may provide just 8 mA).
757          */
758         ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
759         if (ret < 2) {
760                 message = "can't get hub status";
761                 goto fail;
762         }
763         le16_to_cpus(&hubstatus);
764         if (hdev == hdev->bus->root_hub) {
765                 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
766                         hub->mA_per_port = 500;
767                 else {
768                         hub->mA_per_port = hdev->bus_mA;
769                         hub->limited_power = 1;
770                 }
771         } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
772                 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
773                         hub->descriptor->bHubContrCurrent);
774                 hub->limited_power = 1;
775                 if (hdev->maxchild > 0) {
776                         int remaining = hdev->bus_mA -
777                                         hub->descriptor->bHubContrCurrent;
778
779                         if (remaining < hdev->maxchild * 100)
780                                 dev_warn(hub_dev,
781                                         "insufficient power available "
782                                         "to use all downstream ports\n");
783                         hub->mA_per_port = 100;         /* 7.2.1.1 */
784                 }
785         } else {        /* Self-powered external hub */
786                 /* FIXME: What about battery-powered external hubs that
787                  * provide less current per port? */
788                 hub->mA_per_port = 500;
789         }
790         if (hub->mA_per_port < 500)
791                 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
792                                 hub->mA_per_port);
793
794         ret = hub_hub_status(hub, &hubstatus, &hubchange);
795         if (ret < 0) {
796                 message = "can't get hub status";
797                 goto fail;
798         }
799
800         /* local power status reports aren't always correct */
801         if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
802                 dev_dbg(hub_dev, "local power source is %s\n",
803                         (hubstatus & HUB_STATUS_LOCAL_POWER)
804                         ? "lost (inactive)" : "good");
805
806         if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
807                 dev_dbg(hub_dev, "%sover-current condition exists\n",
808                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
809
810         /* set up the interrupt endpoint
811          * We use the EP's maxpacket size instead of (PORTS+1+7)/8
812          * bytes as USB2.0[11.12.3] says because some hubs are known
813          * to send more data (and thus cause overflow). For root hubs,
814          * maxpktsize is defined in hcd.c's fake endpoint descriptors
815          * to be big enough for at least USB_MAXCHILDREN ports. */
816         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
817         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
818
819         if (maxp > sizeof(*hub->buffer))
820                 maxp = sizeof(*hub->buffer);
821
822         hub->urb = usb_alloc_urb(0, GFP_KERNEL);
823         if (!hub->urb) {
824                 message = "couldn't allocate interrupt urb";
825                 ret = -ENOMEM;
826                 goto fail;
827         }
828
829         usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
830                 hub, endpoint->bInterval);
831         hub->urb->transfer_dma = hub->buffer_dma;
832         hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
833
834         /* maybe cycle the hub leds */
835         if (hub->has_indicators && blinkenlights)
836                 hub->indicator [0] = INDICATOR_CYCLE;
837
838         hub_power_on(hub);
839         hub_activate(hub);
840         return 0;
841
842 fail:
843         dev_err (hub_dev, "config failed, %s (err %d)\n",
844                         message, ret);
845         /* hub_disconnect() frees urb and descriptor */
846         return ret;
847 }
848
849 static unsigned highspeed_hubs;
850
851 static void hub_disconnect(struct usb_interface *intf)
852 {
853         struct usb_hub *hub = usb_get_intfdata (intf);
854         struct usb_device *hdev;
855
856         /* Disconnect all children and quiesce the hub */
857         hub->error = 0;
858         hub_pre_reset(intf);
859
860         usb_set_intfdata (intf, NULL);
861         hdev = hub->hdev;
862
863         if (hdev->speed == USB_SPEED_HIGH)
864                 highspeed_hubs--;
865
866         usb_free_urb(hub->urb);
867         hub->urb = NULL;
868
869         spin_lock_irq(&hub_event_lock);
870         list_del_init(&hub->event_list);
871         spin_unlock_irq(&hub_event_lock);
872
873         kfree(hub->descriptor);
874         hub->descriptor = NULL;
875
876         kfree(hub->status);
877         hub->status = NULL;
878
879         if (hub->buffer) {
880                 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
881                                 hub->buffer_dma);
882                 hub->buffer = NULL;
883         }
884
885         kfree(hub);
886 }
887
888 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
889 {
890         struct usb_host_interface *desc;
891         struct usb_endpoint_descriptor *endpoint;
892         struct usb_device *hdev;
893         struct usb_hub *hub;
894
895         desc = intf->cur_altsetting;
896         hdev = interface_to_usbdev(intf);
897
898 #ifdef  CONFIG_USB_OTG_BLACKLIST_HUB
899         if (hdev->parent) {
900                 dev_warn(&intf->dev, "ignoring external hub\n");
901                 return -ENODEV;
902         }
903 #endif
904
905         /* Some hubs have a subclass of 1, which AFAICT according to the */
906         /*  specs is not defined, but it works */
907         if ((desc->desc.bInterfaceSubClass != 0) &&
908             (desc->desc.bInterfaceSubClass != 1)) {
909 descriptor_error:
910                 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
911                 return -EIO;
912         }
913
914         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
915         if (desc->desc.bNumEndpoints != 1)
916                 goto descriptor_error;
917
918         endpoint = &desc->endpoint[0].desc;
919
920         /* If it's not an interrupt in endpoint, we'd better punt! */
921         if (!usb_endpoint_is_int_in(endpoint))
922                 goto descriptor_error;
923
924         /* We found a hub */
925         dev_info (&intf->dev, "USB hub found\n");
926
927         hub = kzalloc(sizeof(*hub), GFP_KERNEL);
928         if (!hub) {
929                 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
930                 return -ENOMEM;
931         }
932
933         INIT_LIST_HEAD(&hub->event_list);
934         hub->intfdev = &intf->dev;
935         hub->hdev = hdev;
936         INIT_DELAYED_WORK(&hub->leds, led_work);
937
938         usb_set_intfdata (intf, hub);
939         intf->needs_remote_wakeup = 1;
940
941         if (hdev->speed == USB_SPEED_HIGH)
942                 highspeed_hubs++;
943
944         if (hub_configure(hub, endpoint) >= 0)
945                 return 0;
946
947         hub_disconnect (intf);
948         return -ENODEV;
949 }
950
951 static int
952 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
953 {
954         struct usb_device *hdev = interface_to_usbdev (intf);
955
956         /* assert ifno == 0 (part of hub spec) */
957         switch (code) {
958         case USBDEVFS_HUB_PORTINFO: {
959                 struct usbdevfs_hub_portinfo *info = user_data;
960                 int i;
961
962                 spin_lock_irq(&device_state_lock);
963                 if (hdev->devnum <= 0)
964                         info->nports = 0;
965                 else {
966                         info->nports = hdev->maxchild;
967                         for (i = 0; i < info->nports; i++) {
968                                 if (hdev->children[i] == NULL)
969                                         info->port[i] = 0;
970                                 else
971                                         info->port[i] =
972                                                 hdev->children[i]->devnum;
973                         }
974                 }
975                 spin_unlock_irq(&device_state_lock);
976
977                 return info->nports + 1;
978                 }
979
980         default:
981                 return -ENOSYS;
982         }
983 }
984
985
986 /* grab device/port lock, returning index of that port (zero based).
987  * protects the upstream link used by this device from concurrent
988  * tree operations like suspend, resume, reset, and disconnect, which
989  * apply to everything downstream of a given port.
990  */
991 static int locktree(struct usb_device *udev)
992 {
993         int                     t;
994         struct usb_device       *hdev;
995
996         if (!udev)
997                 return -ENODEV;
998
999         /* root hub is always the first lock in the series */
1000         hdev = udev->parent;
1001         if (!hdev) {
1002                 usb_lock_device(udev);
1003                 return 0;
1004         }
1005
1006         /* on the path from root to us, lock everything from
1007          * top down, dropping parent locks when not needed
1008          */
1009         t = locktree(hdev);
1010         if (t < 0)
1011                 return t;
1012
1013         /* everything is fail-fast once disconnect
1014          * processing starts
1015          */
1016         if (udev->state == USB_STATE_NOTATTACHED) {
1017                 usb_unlock_device(hdev);
1018                 return -ENODEV;
1019         }
1020
1021         /* when everyone grabs locks top->bottom,
1022          * non-overlapping work may be concurrent
1023          */
1024         usb_lock_device(udev);
1025         usb_unlock_device(hdev);
1026         return udev->portnum;
1027 }
1028
1029 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1030 {
1031         int i;
1032
1033         for (i = 0; i < udev->maxchild; ++i) {
1034                 if (udev->children[i])
1035                         recursively_mark_NOTATTACHED(udev->children[i]);
1036         }
1037         if (udev->state == USB_STATE_SUSPENDED)
1038                 udev->discon_suspended = 1;
1039         udev->state = USB_STATE_NOTATTACHED;
1040 }
1041
1042 /**
1043  * usb_set_device_state - change a device's current state (usbcore, hcds)
1044  * @udev: pointer to device whose state should be changed
1045  * @new_state: new state value to be stored
1046  *
1047  * udev->state is _not_ fully protected by the device lock.  Although
1048  * most transitions are made only while holding the lock, the state can
1049  * can change to USB_STATE_NOTATTACHED at almost any time.  This
1050  * is so that devices can be marked as disconnected as soon as possible,
1051  * without having to wait for any semaphores to be released.  As a result,
1052  * all changes to any device's state must be protected by the
1053  * device_state_lock spinlock.
1054  *
1055  * Once a device has been added to the device tree, all changes to its state
1056  * should be made using this routine.  The state should _not_ be set directly.
1057  *
1058  * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1059  * Otherwise udev->state is set to new_state, and if new_state is
1060  * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1061  * to USB_STATE_NOTATTACHED.
1062  */
1063 void usb_set_device_state(struct usb_device *udev,
1064                 enum usb_device_state new_state)
1065 {
1066         unsigned long flags;
1067
1068         spin_lock_irqsave(&device_state_lock, flags);
1069         if (udev->state == USB_STATE_NOTATTACHED)
1070                 ;       /* do nothing */
1071         else if (new_state != USB_STATE_NOTATTACHED) {
1072
1073                 /* root hub wakeup capabilities are managed out-of-band
1074                  * and may involve silicon errata ... ignore them here.
1075                  */
1076                 if (udev->parent) {
1077                         if (udev->state == USB_STATE_SUSPENDED
1078                                         || new_state == USB_STATE_SUSPENDED)
1079                                 ;       /* No change to wakeup settings */
1080                         else if (new_state == USB_STATE_CONFIGURED)
1081                                 device_init_wakeup(&udev->dev,
1082                                         (udev->actconfig->desc.bmAttributes
1083                                          & USB_CONFIG_ATT_WAKEUP));
1084                         else
1085                                 device_init_wakeup(&udev->dev, 0);
1086                 }
1087                 udev->state = new_state;
1088         } else
1089                 recursively_mark_NOTATTACHED(udev);
1090         spin_unlock_irqrestore(&device_state_lock, flags);
1091 }
1092
1093
1094 #ifdef  CONFIG_PM
1095
1096 /**
1097  * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1098  * @rhdev: struct usb_device for the root hub
1099  *
1100  * The USB host controller driver calls this function when its root hub
1101  * is resumed and Vbus power has been interrupted or the controller
1102  * has been reset.  The routine marks all the children of the root hub
1103  * as NOTATTACHED and marks logical connect-change events on their ports.
1104  */
1105 void usb_root_hub_lost_power(struct usb_device *rhdev)
1106 {
1107         struct usb_hub *hub;
1108         int port1;
1109         unsigned long flags;
1110
1111         dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1112
1113         /* Make sure no potential wakeup events get lost,
1114          * by forcing the root hub to be resumed.
1115          */
1116         rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1117
1118         spin_lock_irqsave(&device_state_lock, flags);
1119         hub = hdev_to_hub(rhdev);
1120         for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1121                 if (rhdev->children[port1 - 1]) {
1122                         recursively_mark_NOTATTACHED(
1123                                         rhdev->children[port1 - 1]);
1124                         set_bit(port1, hub->change_bits);
1125                 }
1126         }
1127         spin_unlock_irqrestore(&device_state_lock, flags);
1128 }
1129 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1130
1131 #endif  /* CONFIG_PM */
1132
1133 static void choose_address(struct usb_device *udev)
1134 {
1135         int             devnum;
1136         struct usb_bus  *bus = udev->bus;
1137
1138         /* If khubd ever becomes multithreaded, this will need a lock */
1139
1140         /* Try to allocate the next devnum beginning at bus->devnum_next. */
1141         devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1142                         bus->devnum_next);
1143         if (devnum >= 128)
1144                 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1145
1146         bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1147
1148         if (devnum < 128) {
1149                 set_bit(devnum, bus->devmap.devicemap);
1150                 udev->devnum = devnum;
1151         }
1152 }
1153
1154 static void release_address(struct usb_device *udev)
1155 {
1156         if (udev->devnum > 0) {
1157                 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1158                 udev->devnum = -1;
1159         }
1160 }
1161
1162 /**
1163  * usb_disconnect - disconnect a device (usbcore-internal)
1164  * @pdev: pointer to device being disconnected
1165  * Context: !in_interrupt ()
1166  *
1167  * Something got disconnected. Get rid of it and all of its children.
1168  *
1169  * If *pdev is a normal device then the parent hub must already be locked.
1170  * If *pdev is a root hub then this routine will acquire the
1171  * usb_bus_list_lock on behalf of the caller.
1172  *
1173  * Only hub drivers (including virtual root hub drivers for host
1174  * controllers) should ever call this.
1175  *
1176  * This call is synchronous, and may not be used in an interrupt context.
1177  */
1178 void usb_disconnect(struct usb_device **pdev)
1179 {
1180         struct usb_device       *udev = *pdev;
1181         int                     i;
1182
1183         if (!udev) {
1184                 pr_debug ("%s nodev\n", __FUNCTION__);
1185                 return;
1186         }
1187
1188         /* mark the device as inactive, so any further urb submissions for
1189          * this device (and any of its children) will fail immediately.
1190          * this quiesces everyting except pending urbs.
1191          */
1192         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1193         dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1194
1195         usb_lock_device(udev);
1196
1197         /* Free up all the children before we remove this device */
1198         for (i = 0; i < USB_MAXCHILDREN; i++) {
1199                 if (udev->children[i])
1200                         usb_disconnect(&udev->children[i]);
1201         }
1202
1203         /* deallocate hcd/hardware state ... nuking all pending urbs and
1204          * cleaning up all state associated with the current configuration
1205          * so that the hardware is now fully quiesced.
1206          */
1207         dev_dbg (&udev->dev, "unregistering device\n");
1208         usb_disable_device(udev, 0);
1209
1210         usb_unlock_device(udev);
1211
1212         /* Unregister the device.  The device driver is responsible
1213          * for removing the device files from usbfs and sysfs and for
1214          * de-configuring the device.
1215          */
1216         device_del(&udev->dev);
1217
1218         /* Free the device number and delete the parent's children[]
1219          * (or root_hub) pointer.
1220          */
1221         release_address(udev);
1222
1223         /* Avoid races with recursively_mark_NOTATTACHED() */
1224         spin_lock_irq(&device_state_lock);
1225         *pdev = NULL;
1226         spin_unlock_irq(&device_state_lock);
1227
1228         /* Decrement the parent's count of unsuspended children */
1229         if (udev->parent) {
1230                 usb_pm_lock(udev);
1231                 if (!udev->discon_suspended)
1232                         usb_autosuspend_device(udev->parent);
1233                 usb_pm_unlock(udev);
1234         }
1235
1236         put_device(&udev->dev);
1237 }
1238
1239 #ifdef DEBUG
1240 static void show_string(struct usb_device *udev, char *id, char *string)
1241 {
1242         if (!string)
1243                 return;
1244         dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1245 }
1246
1247 #else
1248 static inline void show_string(struct usb_device *udev, char *id, char *string)
1249 {}
1250 #endif
1251
1252
1253 #ifdef  CONFIG_USB_OTG
1254 #include "otg_whitelist.h"
1255 static int __usb_port_suspend(struct usb_device *, int port1);
1256 #endif
1257
1258 /**
1259  * usb_new_device - perform initial device setup (usbcore-internal)
1260  * @udev: newly addressed device (in ADDRESS state)
1261  *
1262  * This is called with devices which have been enumerated, but not yet
1263  * configured.  The device descriptor is available, but not descriptors
1264  * for any device configuration.  The caller must have locked either
1265  * the parent hub (if udev is a normal device) or else the
1266  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1267  * udev has already been installed, but udev is not yet visible through
1268  * sysfs or other filesystem code.
1269  *
1270  * It will return if the device is configured properly or not.  Zero if
1271  * the interface was registered with the driver core; else a negative
1272  * errno value.
1273  *
1274  * This call is synchronous, and may not be used in an interrupt context.
1275  *
1276  * Only the hub driver or root-hub registrar should ever call this.
1277  */
1278 int usb_new_device(struct usb_device *udev)
1279 {
1280         int err;
1281
1282         /* Determine quirks */
1283         usb_detect_quirks(udev);
1284
1285         err = usb_get_configuration(udev);
1286         if (err < 0) {
1287                 dev_err(&udev->dev, "can't read configurations, error %d\n",
1288                         err);
1289                 goto fail;
1290         }
1291
1292         /* read the standard strings and cache them if present */
1293         udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1294         udev->manufacturer = usb_cache_string(udev,
1295                         udev->descriptor.iManufacturer);
1296         udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1297
1298         /* Tell the world! */
1299         dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1300                         "SerialNumber=%d\n",
1301                         udev->descriptor.iManufacturer,
1302                         udev->descriptor.iProduct,
1303                         udev->descriptor.iSerialNumber);
1304         show_string(udev, "Product", udev->product);
1305         show_string(udev, "Manufacturer", udev->manufacturer);
1306         show_string(udev, "SerialNumber", udev->serial);
1307
1308 #ifdef  CONFIG_USB_OTG
1309         /*
1310          * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1311          * to wake us after we've powered off VBUS; and HNP, switching roles
1312          * "host" to "peripheral".  The OTG descriptor helps figure this out.
1313          */
1314         if (!udev->bus->is_b_host
1315                         && udev->config
1316                         && udev->parent == udev->bus->root_hub) {
1317                 struct usb_otg_descriptor       *desc = 0;
1318                 struct usb_bus                  *bus = udev->bus;
1319
1320                 /* descriptor may appear anywhere in config */
1321                 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1322                                         le16_to_cpu(udev->config[0].desc.wTotalLength),
1323                                         USB_DT_OTG, (void **) &desc) == 0) {
1324                         if (desc->bmAttributes & USB_OTG_HNP) {
1325                                 unsigned                port1 = udev->portnum;
1326
1327                                 dev_info(&udev->dev,
1328                                         "Dual-Role OTG device on %sHNP port\n",
1329                                         (port1 == bus->otg_port)
1330                                                 ? "" : "non-");
1331
1332                                 /* enable HNP before suspend, it's simpler */
1333                                 if (port1 == bus->otg_port)
1334                                         bus->b_hnp_enable = 1;
1335                                 err = usb_control_msg(udev,
1336                                         usb_sndctrlpipe(udev, 0),
1337                                         USB_REQ_SET_FEATURE, 0,
1338                                         bus->b_hnp_enable
1339                                                 ? USB_DEVICE_B_HNP_ENABLE
1340                                                 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1341                                         0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1342                                 if (err < 0) {
1343                                         /* OTG MESSAGE: report errors here,
1344                                          * customize to match your product.
1345                                          */
1346                                         dev_info(&udev->dev,
1347                                                 "can't set HNP mode; %d\n",
1348                                                 err);
1349                                         bus->b_hnp_enable = 0;
1350                                 }
1351                         }
1352                 }
1353         }
1354
1355         if (!is_targeted(udev)) {
1356
1357                 /* Maybe it can talk to us, though we can't talk to it.
1358                  * (Includes HNP test device.)
1359                  */
1360                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1361                         err = __usb_port_suspend(udev, udev->bus->otg_port);
1362                         if (err < 0)
1363                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1364                 }
1365                 err = -ENODEV;
1366                 goto fail;
1367         }
1368 #endif
1369
1370         /* export the usbdev device-node for libusb */
1371         udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1372                         (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1373
1374         /* Register the device.  The device driver is responsible
1375          * for adding the device files to sysfs and for configuring
1376          * the device.
1377          */
1378         err = device_add(&udev->dev);
1379         if (err) {
1380                 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1381                 goto fail;
1382         }
1383
1384         /* Increment the parent's count of unsuspended children */
1385         if (udev->parent)
1386                 usb_autoresume_device(udev->parent);
1387
1388 exit:
1389         return err;
1390
1391 fail:
1392         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1393         goto exit;
1394 }
1395
1396 static int hub_port_status(struct usb_hub *hub, int port1,
1397                                u16 *status, u16 *change)
1398 {
1399         int ret;
1400
1401         mutex_lock(&hub->status_mutex);
1402         ret = get_port_status(hub->hdev, port1, &hub->status->port);
1403         if (ret < 4) {
1404                 dev_err (hub->intfdev,
1405                         "%s failed (err = %d)\n", __FUNCTION__, ret);
1406                 if (ret >= 0)
1407                         ret = -EIO;
1408         } else {
1409                 *status = le16_to_cpu(hub->status->port.wPortStatus);
1410                 *change = le16_to_cpu(hub->status->port.wPortChange); 
1411                 ret = 0;
1412         }
1413         mutex_unlock(&hub->status_mutex);
1414         return ret;
1415 }
1416
1417
1418 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1419 static unsigned hub_is_wusb(struct usb_hub *hub)
1420 {
1421         struct usb_hcd *hcd;
1422         if (hub->hdev->parent != NULL)  /* not a root hub? */
1423                 return 0;
1424         hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1425         return hcd->wireless;
1426 }
1427
1428
1429 #define PORT_RESET_TRIES        5
1430 #define SET_ADDRESS_TRIES       2
1431 #define GET_DESCRIPTOR_TRIES    2
1432 #define SET_CONFIG_TRIES        (2 * (use_both_schemes + 1))
1433 #define USE_NEW_SCHEME(i)       ((i) / 2 == old_scheme_first)
1434
1435 #define HUB_ROOT_RESET_TIME     50      /* times are in msec */
1436 #define HUB_SHORT_RESET_TIME    10
1437 #define HUB_LONG_RESET_TIME     200
1438 #define HUB_RESET_TIMEOUT       500
1439
1440 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1441                                 struct usb_device *udev, unsigned int delay)
1442 {
1443         int delay_time, ret;
1444         u16 portstatus;
1445         u16 portchange;
1446
1447         for (delay_time = 0;
1448                         delay_time < HUB_RESET_TIMEOUT;
1449                         delay_time += delay) {
1450                 /* wait to give the device a chance to reset */
1451                 msleep(delay);
1452
1453                 /* read and decode port status */
1454                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1455                 if (ret < 0)
1456                         return ret;
1457
1458                 /* Device went away? */
1459                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1460                         return -ENOTCONN;
1461
1462                 /* bomb out completely if something weird happened */
1463                 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1464                         return -EINVAL;
1465
1466                 /* if we`ve finished resetting, then break out of the loop */
1467                 if (!(portstatus & USB_PORT_STAT_RESET) &&
1468                     (portstatus & USB_PORT_STAT_ENABLE)) {
1469                         if (hub_is_wusb(hub))
1470                                 udev->speed = USB_SPEED_VARIABLE;
1471                         else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1472                                 udev->speed = USB_SPEED_HIGH;
1473                         else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1474                                 udev->speed = USB_SPEED_LOW;
1475                         else
1476                                 udev->speed = USB_SPEED_FULL;
1477                         return 0;
1478                 }
1479
1480                 /* switch to the long delay after two short delay failures */
1481                 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1482                         delay = HUB_LONG_RESET_TIME;
1483
1484                 dev_dbg (hub->intfdev,
1485                         "port %d not reset yet, waiting %dms\n",
1486                         port1, delay);
1487         }
1488
1489         return -EBUSY;
1490 }
1491
1492 static int hub_port_reset(struct usb_hub *hub, int port1,
1493                                 struct usb_device *udev, unsigned int delay)
1494 {
1495         int i, status;
1496
1497         /* Reset the port */
1498         for (i = 0; i < PORT_RESET_TRIES; i++) {
1499                 status = set_port_feature(hub->hdev,
1500                                 port1, USB_PORT_FEAT_RESET);
1501                 if (status)
1502                         dev_err(hub->intfdev,
1503                                         "cannot reset port %d (err = %d)\n",
1504                                         port1, status);
1505                 else {
1506                         status = hub_port_wait_reset(hub, port1, udev, delay);
1507                         if (status && status != -ENOTCONN)
1508                                 dev_dbg(hub->intfdev,
1509                                                 "port_wait_reset: err = %d\n",
1510                                                 status);
1511                 }
1512
1513                 /* return on disconnect or reset */
1514                 switch (status) {
1515                 case 0:
1516                         /* TRSTRCY = 10 ms; plus some extra */
1517                         msleep(10 + 40);
1518                         /* FALL THROUGH */
1519                 case -ENOTCONN:
1520                 case -ENODEV:
1521                         clear_port_feature(hub->hdev,
1522                                 port1, USB_PORT_FEAT_C_RESET);
1523                         /* FIXME need disconnect() for NOTATTACHED device */
1524                         usb_set_device_state(udev, status
1525                                         ? USB_STATE_NOTATTACHED
1526                                         : USB_STATE_DEFAULT);
1527                         return status;
1528                 }
1529
1530                 dev_dbg (hub->intfdev,
1531                         "port %d not enabled, trying reset again...\n",
1532                         port1);
1533                 delay = HUB_LONG_RESET_TIME;
1534         }
1535
1536         dev_err (hub->intfdev,
1537                 "Cannot enable port %i.  Maybe the USB cable is bad?\n",
1538                 port1);
1539
1540         return status;
1541 }
1542
1543 /*
1544  * Disable a port and mark a logical connnect-change event, so that some
1545  * time later khubd will disconnect() any existing usb_device on the port
1546  * and will re-enumerate if there actually is a device attached.
1547  */
1548 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1549 {
1550         dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1551         hub_port_disable(hub, port1, 1);
1552
1553         /* FIXME let caller ask to power down the port:
1554          *  - some devices won't enumerate without a VBUS power cycle
1555          *  - SRP saves power that way
1556          *  - ... new call, TBD ...
1557          * That's easy if this hub can switch power per-port, and
1558          * khubd reactivates the port later (timer, SRP, etc).
1559          * Powerdown must be optional, because of reset/DFU.
1560          */
1561
1562         set_bit(port1, hub->change_bits);
1563         kick_khubd(hub);
1564 }
1565
1566 #ifdef  CONFIG_PM
1567
1568 #ifdef  CONFIG_USB_SUSPEND
1569
1570 /*
1571  * Selective port suspend reduces power; most suspended devices draw
1572  * less than 500 uA.  It's also used in OTG, along with remote wakeup.
1573  * All devices below the suspended port are also suspended.
1574  *
1575  * Devices leave suspend state when the host wakes them up.  Some devices
1576  * also support "remote wakeup", where the device can activate the USB
1577  * tree above them to deliver data, such as a keypress or packet.  In
1578  * some cases, this wakes the USB host.
1579  */
1580 static int hub_port_suspend(struct usb_hub *hub, int port1,
1581                 struct usb_device *udev)
1582 {
1583         int     status;
1584
1585         // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1586
1587         /* enable remote wakeup when appropriate; this lets the device
1588          * wake up the upstream hub (including maybe the root hub).
1589          *
1590          * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
1591          * we don't explicitly enable it here.
1592          */
1593         if (udev->do_remote_wakeup) {
1594                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1595                                 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1596                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1597                                 NULL, 0,
1598                                 USB_CTRL_SET_TIMEOUT);
1599                 if (status)
1600                         dev_dbg(&udev->dev,
1601                                 "won't remote wakeup, status %d\n",
1602                                 status);
1603         }
1604
1605         /* see 7.1.7.6 */
1606         status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1607         if (status) {
1608                 dev_dbg(hub->intfdev,
1609                         "can't suspend port %d, status %d\n",
1610                         port1, status);
1611                 /* paranoia:  "should not happen" */
1612                 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1613                                 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1614                                 USB_DEVICE_REMOTE_WAKEUP, 0,
1615                                 NULL, 0,
1616                                 USB_CTRL_SET_TIMEOUT);
1617         } else {
1618                 /* device has up to 10 msec to fully suspend */
1619                 dev_dbg(&udev->dev, "usb %ssuspend\n",
1620                                 udev->auto_pm ? "auto-" : "");
1621                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1622                 msleep(10);
1623         }
1624         return status;
1625 }
1626
1627 /*
1628  * Devices on USB hub ports have only one "suspend" state, corresponding
1629  * to ACPI D2, "may cause the device to lose some context".
1630  * State transitions include:
1631  *
1632  *   - suspend, resume ... when the VBUS power link stays live
1633  *   - suspend, disconnect ... VBUS lost
1634  *
1635  * Once VBUS drop breaks the circuit, the port it's using has to go through
1636  * normal re-enumeration procedures, starting with enabling VBUS power.
1637  * Other than re-initializing the hub (plug/unplug, except for root hubs),
1638  * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
1639  * timer, no SRP, no requests through sysfs.
1640  *
1641  * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1642  * the root hub for their bus goes into global suspend ... so we don't
1643  * (falsely) update the device power state to say it suspended.
1644  */
1645 static int __usb_port_suspend (struct usb_device *udev, int port1)
1646 {
1647         int     status = 0;
1648
1649         /* caller owns the udev device lock */
1650         if (port1 < 0)
1651                 return port1;
1652
1653         /* we change the device's upstream USB link,
1654          * but root hubs have no upstream USB link.
1655          */
1656         if (udev->parent)
1657                 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1658                                 udev);
1659         else {
1660                 dev_dbg(&udev->dev, "usb %ssuspend\n",
1661                                 udev->auto_pm ? "auto-" : "");
1662                 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1663         }
1664         return status;
1665 }
1666
1667 /*
1668  * usb_port_suspend - suspend a usb device's upstream port
1669  * @udev: device that's no longer in active use
1670  * Context: must be able to sleep; device not locked; pm locks held
1671  *
1672  * Suspends a USB device that isn't in active use, conserving power.
1673  * Devices may wake out of a suspend, if anything important happens,
1674  * using the remote wakeup mechanism.  They may also be taken out of
1675  * suspend by the host, using usb_port_resume().  It's also routine
1676  * to disconnect devices while they are suspended.
1677  *
1678  * This only affects the USB hardware for a device; its interfaces
1679  * (and, for hubs, child devices) must already have been suspended.
1680  *
1681  * Suspending OTG devices may trigger HNP, if that's been enabled
1682  * between a pair of dual-role devices.  That will change roles, such
1683  * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1684  *
1685  * Returns 0 on success, else negative errno.
1686  */
1687 int usb_port_suspend(struct usb_device *udev)
1688 {
1689         return __usb_port_suspend(udev, udev->portnum);
1690 }
1691
1692 /*
1693  * If the USB "suspend" state is in use (rather than "global suspend"),
1694  * many devices will be individually taken out of suspend state using
1695  * special" resume" signaling.  These routines kick in shortly after
1696  * hardware resume signaling is finished, either because of selective
1697  * resume (by host) or remote wakeup (by device) ... now see what changed
1698  * in the tree that's rooted at this device.
1699  */
1700 static int finish_port_resume(struct usb_device *udev)
1701 {
1702         int     status;
1703         u16     devstatus;
1704
1705         /* caller owns the udev device lock */
1706         dev_dbg(&udev->dev, "finish resume\n");
1707
1708         /* usb ch9 identifies four variants of SUSPENDED, based on what
1709          * state the device resumes to.  Linux currently won't see the
1710          * first two on the host side; they'd be inside hub_port_init()
1711          * during many timeouts, but khubd can't suspend until later.
1712          */
1713         usb_set_device_state(udev, udev->actconfig
1714                         ? USB_STATE_CONFIGURED
1715                         : USB_STATE_ADDRESS);
1716
1717         /* 10.5.4.5 says be sure devices in the tree are still there.
1718          * For now let's assume the device didn't go crazy on resume,
1719          * and device drivers will know about any resume quirks.
1720          */
1721         status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1722         if (status >= 0)
1723                 status = (status == 2 ? 0 : -ENODEV);
1724
1725         if (status)
1726                 dev_dbg(&udev->dev,
1727                         "gone after usb resume? status %d\n",
1728                         status);
1729         else if (udev->actconfig) {
1730                 le16_to_cpus(&devstatus);
1731                 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1732                                 && udev->parent) {
1733                         status = usb_control_msg(udev,
1734                                         usb_sndctrlpipe(udev, 0),
1735                                         USB_REQ_CLEAR_FEATURE,
1736                                                 USB_RECIP_DEVICE,
1737                                         USB_DEVICE_REMOTE_WAKEUP, 0,
1738                                         NULL, 0,
1739                                         USB_CTRL_SET_TIMEOUT);
1740                         if (status)
1741                                 dev_dbg(&udev->dev, "disable remote "
1742                                         "wakeup, status %d\n", status);
1743                 }
1744                 status = 0;
1745
1746         } else if (udev->devnum <= 0) {
1747                 dev_dbg(&udev->dev, "bogus resume!\n");
1748                 status = -EINVAL;
1749         }
1750         return status;
1751 }
1752
1753 static int
1754 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1755 {
1756         int     status;
1757         u16     portchange, portstatus;
1758
1759         /* Skip the initial Clear-Suspend step for a remote wakeup */
1760         status = hub_port_status(hub, port1, &portstatus, &portchange);
1761         if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1762                 goto SuspendCleared;
1763
1764         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1765
1766         set_bit(port1, hub->busy_bits);
1767
1768         /* see 7.1.7.7; affects power usage, but not budgeting */
1769         status = clear_port_feature(hub->hdev,
1770                         port1, USB_PORT_FEAT_SUSPEND);
1771         if (status) {
1772                 dev_dbg(hub->intfdev,
1773                         "can't resume port %d, status %d\n",
1774                         port1, status);
1775         } else {
1776                 /* drive resume for at least 20 msec */
1777                 if (udev)
1778                         dev_dbg(&udev->dev, "usb %sresume\n",
1779                                         udev->auto_pm ? "auto-" : "");
1780                 msleep(25);
1781
1782 #define LIVE_FLAGS      ( USB_PORT_STAT_POWER \
1783                         | USB_PORT_STAT_ENABLE \
1784                         | USB_PORT_STAT_CONNECTION)
1785
1786                 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1787                  * stop resume signaling.  Then finish the resume
1788                  * sequence.
1789                  */
1790                 status = hub_port_status(hub, port1, &portstatus, &portchange);
1791 SuspendCleared:
1792                 if (status < 0
1793                                 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1794                                 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1795                                 ) {
1796                         dev_dbg(hub->intfdev,
1797                                 "port %d status %04x.%04x after resume, %d\n",
1798                                 port1, portchange, portstatus, status);
1799                         if (status >= 0)
1800                                 status = -ENODEV;
1801                 } else {
1802                         if (portchange & USB_PORT_STAT_C_SUSPEND)
1803                                 clear_port_feature(hub->hdev, port1,
1804                                                 USB_PORT_FEAT_C_SUSPEND);
1805                         /* TRSMRCY = 10 msec */
1806                         msleep(10);
1807                         if (udev)
1808                                 status = finish_port_resume(udev);
1809                 }
1810         }
1811         if (status < 0)
1812                 hub_port_logical_disconnect(hub, port1);
1813
1814         clear_bit(port1, hub->busy_bits);
1815         if (!hub->hdev->parent && !hub->busy_bits[0])
1816                 usb_enable_root_hub_irq(hub->hdev->bus);
1817
1818         return status;
1819 }
1820
1821 /*
1822  * usb_port_resume - re-activate a suspended usb device's upstream port
1823  * @udev: device to re-activate
1824  * Context: must be able to sleep; device not locked; pm locks held
1825  *
1826  * This will re-activate the suspended device, increasing power usage
1827  * while letting drivers communicate again with its endpoints.
1828  * USB resume explicitly guarantees that the power session between
1829  * the host and the device is the same as it was when the device
1830  * suspended.
1831  *
1832  * Returns 0 on success, else negative errno.
1833  */
1834 int usb_port_resume(struct usb_device *udev)
1835 {
1836         int     status;
1837
1838         /* we change the device's upstream USB link,
1839          * but root hubs have no upstream USB link.
1840          */
1841         if (udev->parent) {
1842                 // NOTE this fails if parent is also suspended...
1843                 status = hub_port_resume(hdev_to_hub(udev->parent),
1844                                 udev->portnum, udev);
1845         } else {
1846                 dev_dbg(&udev->dev, "usb %sresume\n",
1847                                 udev->auto_pm ? "auto-" : "");
1848                 status = finish_port_resume(udev);
1849         }
1850         if (status < 0)
1851                 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1852         return status;
1853 }
1854
1855 static int remote_wakeup(struct usb_device *udev)
1856 {
1857         int     status = 0;
1858
1859         usb_lock_device(udev);
1860         if (udev->state == USB_STATE_SUSPENDED) {
1861                 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1862                 usb_mark_last_busy(udev);
1863                 status = usb_external_resume_device(udev);
1864         }
1865         usb_unlock_device(udev);
1866         return status;
1867 }
1868
1869 #else   /* CONFIG_USB_SUSPEND */
1870
1871 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1872
1873 int usb_port_suspend(struct usb_device *udev)
1874 {
1875         return 0;
1876 }
1877
1878 static inline int
1879 finish_port_resume(struct usb_device *udev)
1880 {
1881         return 0;
1882 }
1883
1884 static inline int
1885 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1886 {
1887         return 0;
1888 }
1889
1890 int usb_port_resume(struct usb_device *udev)
1891 {
1892         return 0;
1893 }
1894
1895 static inline int remote_wakeup(struct usb_device *udev)
1896 {
1897         return 0;
1898 }
1899
1900 #endif
1901
1902 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1903 {
1904         struct usb_hub          *hub = usb_get_intfdata (intf);
1905         struct usb_device       *hdev = hub->hdev;
1906         unsigned                port1;
1907         int                     status = 0;
1908
1909         /* fail if children aren't already suspended */
1910         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1911                 struct usb_device       *udev;
1912
1913                 udev = hdev->children [port1-1];
1914                 if (udev && msg.event == PM_EVENT_SUSPEND &&
1915 #ifdef  CONFIG_USB_SUSPEND
1916                                 udev->state != USB_STATE_SUSPENDED
1917 #else
1918                                 udev->dev.power.power_state.event
1919                                         == PM_EVENT_ON
1920 #endif
1921                                 ) {
1922                         if (!hdev->auto_pm)
1923                                 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1924                                                 port1);
1925                         return -EBUSY;
1926                 }
1927         }
1928
1929         dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1930
1931         /* stop khubd and related activity */
1932         hub_quiesce(hub);
1933
1934         /* "global suspend" of the downstream HC-to-USB interface */
1935         if (!hdev->parent) {
1936                 status = hcd_bus_suspend(hdev->bus);
1937                 if (status != 0) {
1938                         dev_dbg(&hdev->dev, "'global' suspend %d\n", status);
1939                         hub_activate(hub);
1940                 }
1941         }
1942         return status;
1943 }
1944
1945 static int hub_resume(struct usb_interface *intf)
1946 {
1947         struct usb_hub          *hub = usb_get_intfdata (intf);
1948         struct usb_device       *hdev = hub->hdev;
1949         int                     status;
1950
1951         dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1952
1953         /* "global resume" of the downstream HC-to-USB interface */
1954         if (!hdev->parent) {
1955                 struct usb_bus  *bus = hdev->bus;
1956                 if (bus) {
1957                         status = hcd_bus_resume (bus);
1958                         if (status) {
1959                                 dev_dbg(&intf->dev, "'global' resume %d\n",
1960                                         status);
1961                                 return status;
1962                         }
1963                 } else
1964                         return -EOPNOTSUPP;
1965                 if (status == 0) {
1966                         /* TRSMRCY = 10 msec */
1967                         msleep(10);
1968                 }
1969         }
1970
1971         /* tell khubd to look for changes on this hub */
1972         hub_activate(hub);
1973         return 0;
1974 }
1975
1976 #else   /* CONFIG_PM */
1977
1978 static inline int remote_wakeup(struct usb_device *udev)
1979 {
1980         return 0;
1981 }
1982
1983 #define hub_suspend NULL
1984 #define hub_resume NULL
1985 #endif
1986
1987
1988 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1989  *
1990  * Between connect detection and reset signaling there must be a delay
1991  * of 100ms at least for debounce and power-settling.  The corresponding
1992  * timer shall restart whenever the downstream port detects a disconnect.
1993  * 
1994  * Apparently there are some bluetooth and irda-dongles and a number of
1995  * low-speed devices for which this debounce period may last over a second.
1996  * Not covered by the spec - but easy to deal with.
1997  *
1998  * This implementation uses a 1500ms total debounce timeout; if the
1999  * connection isn't stable by then it returns -ETIMEDOUT.  It checks
2000  * every 25ms for transient disconnects.  When the port status has been
2001  * unchanged for 100ms it returns the port status.
2002  */
2003
2004 #define HUB_DEBOUNCE_TIMEOUT    1500
2005 #define HUB_DEBOUNCE_STEP         25
2006 #define HUB_DEBOUNCE_STABLE      100
2007
2008 static int hub_port_debounce(struct usb_hub *hub, int port1)
2009 {
2010         int ret;
2011         int total_time, stable_time = 0;
2012         u16 portchange, portstatus;
2013         unsigned connection = 0xffff;
2014
2015         for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2016                 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2017                 if (ret < 0)
2018                         return ret;
2019
2020                 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2021                      (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2022                         stable_time += HUB_DEBOUNCE_STEP;
2023                         if (stable_time >= HUB_DEBOUNCE_STABLE)
2024                                 break;
2025                 } else {
2026                         stable_time = 0;
2027                         connection = portstatus & USB_PORT_STAT_CONNECTION;
2028                 }
2029
2030                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2031                         clear_port_feature(hub->hdev, port1,
2032                                         USB_PORT_FEAT_C_CONNECTION);
2033                 }
2034
2035                 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2036                         break;
2037                 msleep(HUB_DEBOUNCE_STEP);
2038         }
2039
2040         dev_dbg (hub->intfdev,
2041                 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2042                 port1, total_time, stable_time, portstatus);
2043
2044         if (stable_time < HUB_DEBOUNCE_STABLE)
2045                 return -ETIMEDOUT;
2046         return portstatus;
2047 }
2048
2049 static void ep0_reinit(struct usb_device *udev)
2050 {
2051         usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2052         usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2053         udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2054 }
2055
2056 #define usb_sndaddr0pipe()      (PIPE_CONTROL << 30)
2057 #define usb_rcvaddr0pipe()      ((PIPE_CONTROL << 30) | USB_DIR_IN)
2058
2059 static int hub_set_address(struct usb_device *udev)
2060 {
2061         int retval;
2062
2063         if (udev->devnum == 0)
2064                 return -EINVAL;
2065         if (udev->state == USB_STATE_ADDRESS)
2066                 return 0;
2067         if (udev->state != USB_STATE_DEFAULT)
2068                 return -EINVAL;
2069         retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2070                 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2071                 NULL, 0, USB_CTRL_SET_TIMEOUT);
2072         if (retval == 0) {
2073                 usb_set_device_state(udev, USB_STATE_ADDRESS);
2074                 ep0_reinit(udev);
2075         }
2076         return retval;
2077 }
2078
2079 /* Reset device, (re)assign address, get device descriptor.
2080  * Device connection must be stable, no more debouncing needed.
2081  * Returns device in USB_STATE_ADDRESS, except on error.
2082  *
2083  * If this is called for an already-existing device (as part of
2084  * usb_reset_device), the caller must own the device lock.  For a
2085  * newly detected device that is not accessible through any global
2086  * pointers, it's not necessary to lock the device.
2087  */
2088 static int
2089 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2090                 int retry_counter)
2091 {
2092         static DEFINE_MUTEX(usb_address0_mutex);
2093
2094         struct usb_device       *hdev = hub->hdev;
2095         int                     i, j, retval;
2096         unsigned                delay = HUB_SHORT_RESET_TIME;
2097         enum usb_device_speed   oldspeed = udev->speed;
2098         char                    *speed, *type;
2099
2100         /* root hub ports have a slightly longer reset period
2101          * (from USB 2.0 spec, section 7.1.7.5)
2102          */
2103         if (!hdev->parent) {
2104                 delay = HUB_ROOT_RESET_TIME;
2105                 if (port1 == hdev->bus->otg_port)
2106                         hdev->bus->b_hnp_enable = 0;
2107         }
2108
2109         /* Some low speed devices have problems with the quick delay, so */
2110         /*  be a bit pessimistic with those devices. RHbug #23670 */
2111         if (oldspeed == USB_SPEED_LOW)
2112                 delay = HUB_LONG_RESET_TIME;
2113
2114         mutex_lock(&usb_address0_mutex);
2115
2116         /* Reset the device; full speed may morph to high speed */
2117         retval = hub_port_reset(hub, port1, udev, delay);
2118         if (retval < 0)         /* error or disconnect */
2119                 goto fail;
2120                                 /* success, speed is known */
2121         retval = -ENODEV;
2122
2123         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2124                 dev_dbg(&udev->dev, "device reset changed speed!\n");
2125                 goto fail;
2126         }
2127         oldspeed = udev->speed;
2128   
2129         /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2130          * it's fixed size except for full speed devices.
2131          * For Wireless USB devices, ep0 max packet is always 512 (tho
2132          * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2133          */
2134         switch (udev->speed) {
2135         case USB_SPEED_VARIABLE:        /* fixed at 512 */
2136                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2137                 break;
2138         case USB_SPEED_HIGH:            /* fixed at 64 */
2139                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2140                 break;
2141         case USB_SPEED_FULL:            /* 8, 16, 32, or 64 */
2142                 /* to determine the ep0 maxpacket size, try to read
2143                  * the device descriptor to get bMaxPacketSize0 and
2144                  * then correct our initial guess.
2145                  */
2146                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2147                 break;
2148         case USB_SPEED_LOW:             /* fixed at 8 */
2149                 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2150                 break;
2151         default:
2152                 goto fail;
2153         }
2154  
2155         type = "";
2156         switch (udev->speed) {
2157         case USB_SPEED_LOW:     speed = "low";  break;
2158         case USB_SPEED_FULL:    speed = "full"; break;
2159         case USB_SPEED_HIGH:    speed = "high"; break;
2160         case USB_SPEED_VARIABLE:
2161                                 speed = "variable";
2162                                 type = "Wireless ";
2163                                 break;
2164         default:                speed = "?";    break;
2165         }
2166         dev_info (&udev->dev,
2167                   "%s %s speed %sUSB device using %s and address %d\n",
2168                   (udev->config) ? "reset" : "new", speed, type,
2169                   udev->bus->controller->driver->name, udev->devnum);
2170
2171         /* Set up TT records, if needed  */
2172         if (hdev->tt) {
2173                 udev->tt = hdev->tt;
2174                 udev->ttport = hdev->ttport;
2175         } else if (udev->speed != USB_SPEED_HIGH
2176                         && hdev->speed == USB_SPEED_HIGH) {
2177                 udev->tt = &hub->tt;
2178                 udev->ttport = port1;
2179         }
2180  
2181         /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2182          * Because device hardware and firmware is sometimes buggy in
2183          * this area, and this is how Linux has done it for ages.
2184          * Change it cautiously.
2185          *
2186          * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2187          * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2188          * so it may help with some non-standards-compliant devices.
2189          * Otherwise we start with SET_ADDRESS and then try to read the
2190          * first 8 bytes of the device descriptor to get the ep0 maxpacket
2191          * value.
2192          */
2193         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2194                 if (USE_NEW_SCHEME(retry_counter)) {
2195                         struct usb_device_descriptor *buf;
2196                         int r = 0;
2197
2198 #define GET_DESCRIPTOR_BUFSIZE  64
2199                         buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2200                         if (!buf) {
2201                                 retval = -ENOMEM;
2202                                 continue;
2203                         }
2204
2205                         /* Use a short timeout the first time through,
2206                          * so that recalcitrant full-speed devices with
2207                          * 8- or 16-byte ep0-maxpackets won't slow things
2208                          * down tremendously by NAKing the unexpectedly
2209                          * early status stage.  Also, retry on all errors;
2210                          * some devices are flakey.
2211                          * 255 is for WUSB devices, we actually need to use 512.
2212                          * WUSB1.0[4.8.1].
2213                          */
2214                         for (j = 0; j < 3; ++j) {
2215                                 buf->bMaxPacketSize0 = 0;
2216                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2217                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2218                                         USB_DT_DEVICE << 8, 0,
2219                                         buf, GET_DESCRIPTOR_BUFSIZE,
2220                                         (i ? USB_CTRL_GET_TIMEOUT : 1000));
2221                                 switch (buf->bMaxPacketSize0) {
2222                                 case 8: case 16: case 32: case 64: case 255:
2223                                         if (buf->bDescriptorType ==
2224                                                         USB_DT_DEVICE) {
2225                                                 r = 0;
2226                                                 break;
2227                                         }
2228                                         /* FALL THROUGH */
2229                                 default:
2230                                         if (r == 0)
2231                                                 r = -EPROTO;
2232                                         break;
2233                                 }
2234                                 if (r == 0)
2235                                         break;
2236                         }
2237                         udev->descriptor.bMaxPacketSize0 =
2238                                         buf->bMaxPacketSize0;
2239                         kfree(buf);
2240
2241                         retval = hub_port_reset(hub, port1, udev, delay);
2242                         if (retval < 0)         /* error or disconnect */
2243                                 goto fail;
2244                         if (oldspeed != udev->speed) {
2245                                 dev_dbg(&udev->dev,
2246                                         "device reset changed speed!\n");
2247                                 retval = -ENODEV;
2248                                 goto fail;
2249                         }
2250                         if (r) {
2251                                 dev_err(&udev->dev, "device descriptor "
2252                                                 "read/%s, error %d\n",
2253                                                 "64", r);
2254                                 retval = -EMSGSIZE;
2255                                 continue;
2256                         }
2257 #undef GET_DESCRIPTOR_BUFSIZE
2258                 }
2259
2260                 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2261                         retval = hub_set_address(udev);
2262                         if (retval >= 0)
2263                                 break;
2264                         msleep(200);
2265                 }
2266                 if (retval < 0) {
2267                         dev_err(&udev->dev,
2268                                 "device not accepting address %d, error %d\n",
2269                                 udev->devnum, retval);
2270                         goto fail;
2271                 }
2272  
2273                 /* cope with hardware quirkiness:
2274                  *  - let SET_ADDRESS settle, some device hardware wants it
2275                  *  - read ep0 maxpacket even for high and low speed,
2276                  */
2277                 msleep(10);
2278                 if (USE_NEW_SCHEME(retry_counter))
2279                         break;
2280
2281                 retval = usb_get_device_descriptor(udev, 8);
2282                 if (retval < 8) {
2283                         dev_err(&udev->dev, "device descriptor "
2284                                         "read/%s, error %d\n",
2285                                         "8", retval);
2286                         if (retval >= 0)
2287                                 retval = -EMSGSIZE;
2288                 } else {
2289                         retval = 0;
2290                         break;
2291                 }
2292         }
2293         if (retval)
2294                 goto fail;
2295
2296         i = udev->descriptor.bMaxPacketSize0 == 0xff?
2297             512 : udev->descriptor.bMaxPacketSize0;
2298         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2299                 if (udev->speed != USB_SPEED_FULL ||
2300                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2301                         dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2302                         retval = -EMSGSIZE;
2303                         goto fail;
2304                 }
2305                 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2306                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2307                 ep0_reinit(udev);
2308         }
2309   
2310         retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2311         if (retval < (signed)sizeof(udev->descriptor)) {
2312                 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2313                         "all", retval);
2314                 if (retval >= 0)
2315                         retval = -ENOMSG;
2316                 goto fail;
2317         }
2318
2319         retval = 0;
2320
2321 fail:
2322         if (retval)
2323                 hub_port_disable(hub, port1, 0);
2324         mutex_unlock(&usb_address0_mutex);
2325         return retval;
2326 }
2327
2328 static void
2329 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2330 {
2331         struct usb_qualifier_descriptor *qual;
2332         int                             status;
2333
2334         qual = kmalloc (sizeof *qual, GFP_KERNEL);
2335         if (qual == NULL)
2336                 return;
2337
2338         status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2339                         qual, sizeof *qual);
2340         if (status == sizeof *qual) {
2341                 dev_info(&udev->dev, "not running at top speed; "
2342                         "connect to a high speed hub\n");
2343                 /* hub LEDs are probably harder to miss than syslog */
2344                 if (hub->has_indicators) {
2345                         hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2346                         schedule_delayed_work (&hub->leds, 0);
2347                 }
2348         }
2349         kfree(qual);
2350 }
2351
2352 static unsigned
2353 hub_power_remaining (struct usb_hub *hub)
2354 {
2355         struct usb_device *hdev = hub->hdev;
2356         int remaining;
2357         int port1;
2358
2359         if (!hub->limited_power)
2360                 return 0;
2361
2362         remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2363         for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2364                 struct usb_device       *udev = hdev->children[port1 - 1];
2365                 int                     delta;
2366
2367                 if (!udev)
2368                         continue;
2369
2370                 /* Unconfigured devices may not use more than 100mA,
2371                  * or 8mA for OTG ports */
2372                 if (udev->actconfig)
2373                         delta = udev->actconfig->desc.bMaxPower * 2;
2374                 else if (port1 != udev->bus->otg_port || hdev->parent)
2375                         delta = 100;
2376                 else
2377                         delta = 8;
2378                 if (delta > hub->mA_per_port)
2379                         dev_warn(&udev->dev, "%dmA is over %umA budget "
2380                                         "for port %d!\n",
2381                                         delta, hub->mA_per_port, port1);
2382                 remaining -= delta;
2383         }
2384         if (remaining < 0) {
2385                 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2386                         - remaining);
2387                 remaining = 0;
2388         }
2389         return remaining;
2390 }
2391
2392 /* Handle physical or logical connection change events.
2393  * This routine is called when:
2394  *      a port connection-change occurs;
2395  *      a port enable-change occurs (often caused by EMI);
2396  *      usb_reset_device() encounters changed descriptors (as from
2397  *              a firmware download)
2398  * caller already locked the hub
2399  */
2400 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2401                                         u16 portstatus, u16 portchange)
2402 {
2403         struct usb_device *hdev = hub->hdev;
2404         struct device *hub_dev = hub->intfdev;
2405         u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2406         int status, i;
2407  
2408         dev_dbg (hub_dev,
2409                 "port %d, status %04x, change %04x, %s\n",
2410                 port1, portstatus, portchange, portspeed (portstatus));
2411
2412         if (hub->has_indicators) {
2413                 set_port_led(hub, port1, HUB_LED_AUTO);
2414                 hub->indicator[port1-1] = INDICATOR_AUTO;
2415         }
2416  
2417         /* Disconnect any existing devices under this port */
2418         if (hdev->children[port1-1])
2419                 usb_disconnect(&hdev->children[port1-1]);
2420         clear_bit(port1, hub->change_bits);
2421
2422 #ifdef  CONFIG_USB_OTG
2423         /* during HNP, don't repeat the debounce */
2424         if (hdev->bus->is_b_host)
2425                 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2426 #endif
2427
2428         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2429                 status = hub_port_debounce(hub, port1);
2430                 if (status < 0 && printk_ratelimit()) {
2431                         dev_err (hub_dev,
2432                                 "connect-debounce failed, port %d disabled\n",
2433                                 port1);
2434                         goto done;
2435                 }
2436                 portstatus = status;
2437         }
2438
2439         /* Return now if nothing is connected */
2440         if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2441
2442                 /* maybe switch power back on (e.g. root hub was reset) */
2443                 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2444                                 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2445                         set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2446  
2447                 if (portstatus & USB_PORT_STAT_ENABLE)
2448                         goto done;
2449                 return;
2450         }
2451
2452 #ifdef  CONFIG_USB_SUSPEND
2453         /* If something is connected, but the port is suspended, wake it up. */
2454         if (portstatus & USB_PORT_STAT_SUSPEND) {
2455                 status = hub_port_resume(hub, port1, NULL);
2456                 if (status < 0) {
2457                         dev_dbg(hub_dev,
2458                                 "can't clear suspend on port %d; %d\n",
2459                                 port1, status);
2460                         goto done;
2461                 }
2462         }
2463 #endif
2464
2465         for (i = 0; i < SET_CONFIG_TRIES; i++) {
2466                 struct usb_device *udev;
2467
2468                 /* reallocate for each attempt, since references
2469                  * to the previous one can escape in various ways
2470                  */
2471                 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2472                 if (!udev) {
2473                         dev_err (hub_dev,
2474                                 "couldn't allocate port %d usb_device\n",
2475                                 port1);
2476                         goto done;
2477                 }
2478
2479                 usb_set_device_state(udev, USB_STATE_POWERED);
2480                 udev->speed = USB_SPEED_UNKNOWN;
2481                 udev->bus_mA = hub->mA_per_port;
2482                 udev->level = hdev->level + 1;
2483
2484                 /* set the address */
2485                 choose_address(udev);
2486                 if (udev->devnum <= 0) {
2487                         status = -ENOTCONN;     /* Don't retry */
2488                         goto loop;
2489                 }
2490
2491                 /* reset and get descriptor */
2492                 status = hub_port_init(hub, udev, port1, i);
2493                 if (status < 0)
2494                         goto loop;
2495
2496                 /* consecutive bus-powered hubs aren't reliable; they can
2497                  * violate the voltage drop budget.  if the new child has
2498                  * a "powered" LED, users should notice we didn't enable it
2499                  * (without reading syslog), even without per-port LEDs
2500                  * on the parent.
2501                  */
2502                 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2503                                 && udev->bus_mA <= 100) {
2504                         u16     devstat;
2505
2506                         status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2507                                         &devstat);
2508                         if (status < 2) {
2509                                 dev_dbg(&udev->dev, "get status %d ?\n", status);
2510                                 goto loop_disable;
2511                         }
2512                         le16_to_cpus(&devstat);
2513                         if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2514                                 dev_err(&udev->dev,
2515                                         "can't connect bus-powered hub "
2516                                         "to this port\n");
2517                                 if (hub->has_indicators) {
2518                                         hub->indicator[port1-1] =
2519                                                 INDICATOR_AMBER_BLINK;
2520                                         schedule_delayed_work (&hub->leds, 0);
2521                                 }
2522                                 status = -ENOTCONN;     /* Don't retry */
2523                                 goto loop_disable;
2524                         }
2525                 }
2526  
2527                 /* check for devices running slower than they could */
2528                 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2529                                 && udev->speed == USB_SPEED_FULL
2530                                 && highspeed_hubs != 0)
2531                         check_highspeed (hub, udev, port1);
2532
2533                 /* Store the parent's children[] pointer.  At this point
2534                  * udev becomes globally accessible, although presumably
2535                  * no one will look at it until hdev is unlocked.
2536                  */
2537                 status = 0;
2538
2539                 /* We mustn't add new devices if the parent hub has
2540                  * been disconnected; we would race with the
2541                  * recursively_mark_NOTATTACHED() routine.
2542                  */
2543                 spin_lock_irq(&device_state_lock);
2544                 if (hdev->state == USB_STATE_NOTATTACHED)
2545                         status = -ENOTCONN;
2546                 else
2547                         hdev->children[port1-1] = udev;
2548                 spin_unlock_irq(&device_state_lock);
2549
2550                 /* Run it through the hoops (find a driver, etc) */
2551                 if (!status) {
2552                         status = usb_new_device(udev);
2553                         if (status) {
2554                                 spin_lock_irq(&device_state_lock);
2555                                 hdev->children[port1-1] = NULL;
2556                                 spin_unlock_irq(&device_state_lock);
2557                         }
2558                 }
2559
2560                 if (status)
2561                         goto loop_disable;
2562
2563                 status = hub_power_remaining(hub);
2564                 if (status)
2565                         dev_dbg(hub_dev, "%dmA power budget left\n", status);
2566
2567                 return;
2568
2569 loop_disable:
2570                 hub_port_disable(hub, port1, 1);
2571 loop:
2572                 ep0_reinit(udev);
2573                 release_address(udev);
2574                 usb_put_dev(udev);
2575                 if (status == -ENOTCONN)
2576                         break;
2577         }
2578  
2579 done:
2580         hub_port_disable(hub, port1, 1);
2581 }
2582
2583 static void hub_events(void)
2584 {
2585         struct list_head *tmp;
2586         struct usb_device *hdev;
2587         struct usb_interface *intf;
2588         struct usb_hub *hub;
2589         struct device *hub_dev;
2590         u16 hubstatus;
2591         u16 hubchange;
2592         u16 portstatus;
2593         u16 portchange;
2594         int i, ret;
2595         int connect_change;
2596
2597         /*
2598          *  We restart the list every time to avoid a deadlock with
2599          * deleting hubs downstream from this one. This should be
2600          * safe since we delete the hub from the event list.
2601          * Not the most efficient, but avoids deadlocks.
2602          */
2603         while (1) {
2604
2605                 /* Grab the first entry at the beginning of the list */
2606                 spin_lock_irq(&hub_event_lock);
2607                 if (list_empty(&hub_event_list)) {
2608                         spin_unlock_irq(&hub_event_lock);
2609                         break;
2610                 }
2611
2612                 tmp = hub_event_list.next;
2613                 list_del_init(tmp);
2614
2615                 hub = list_entry(tmp, struct usb_hub, event_list);
2616                 hdev = hub->hdev;
2617                 intf = to_usb_interface(hub->intfdev);
2618                 hub_dev = &intf->dev;
2619
2620                 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2621                                 hdev->state, hub->descriptor
2622                                         ? hub->descriptor->bNbrPorts
2623                                         : 0,
2624                                 /* NOTE: expects max 15 ports... */
2625                                 (u16) hub->change_bits[0],
2626                                 (u16) hub->event_bits[0]);
2627
2628                 usb_get_intf(intf);
2629                 spin_unlock_irq(&hub_event_lock);
2630
2631                 /* Lock the device, then check to see if we were
2632                  * disconnected while waiting for the lock to succeed. */
2633                 if (locktree(hdev) < 0) {
2634                         usb_put_intf(intf);
2635                         continue;
2636                 }
2637                 if (hub != usb_get_intfdata(intf))
2638                         goto loop;
2639
2640                 /* If the hub has died, clean up after it */
2641                 if (hdev->state == USB_STATE_NOTATTACHED) {
2642                         hub->error = -ENODEV;
2643                         hub_pre_reset(intf);
2644                         goto loop;
2645                 }
2646
2647                 /* Autoresume */
2648                 ret = usb_autopm_get_interface(intf);
2649                 if (ret) {
2650                         dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2651                         goto loop;
2652                 }
2653
2654                 /* If this is an inactive hub, do nothing */
2655                 if (hub->quiescing)
2656                         goto loop_autopm;
2657
2658                 if (hub->error) {
2659                         dev_dbg (hub_dev, "resetting for error %d\n",
2660                                 hub->error);
2661
2662                         ret = usb_reset_composite_device(hdev, intf);
2663                         if (ret) {
2664                                 dev_dbg (hub_dev,
2665                                         "error resetting hub: %d\n", ret);
2666                                 goto loop_autopm;
2667                         }
2668
2669                         hub->nerrors = 0;
2670                         hub->error = 0;
2671                 }
2672
2673                 /* deal with port status changes */
2674                 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2675                         if (test_bit(i, hub->busy_bits))
2676                                 continue;
2677                         connect_change = test_bit(i, hub->change_bits);
2678                         if (!test_and_clear_bit(i, hub->event_bits) &&
2679                                         !connect_change && !hub->activating)
2680                                 continue;
2681
2682                         ret = hub_port_status(hub, i,
2683                                         &portstatus, &portchange);
2684                         if (ret < 0)
2685                                 continue;
2686
2687                         if (hub->activating && !hdev->children[i-1] &&
2688                                         (portstatus &
2689                                                 USB_PORT_STAT_CONNECTION))
2690                                 connect_change = 1;
2691
2692                         if (portchange & USB_PORT_STAT_C_CONNECTION) {
2693                                 clear_port_feature(hdev, i,
2694                                         USB_PORT_FEAT_C_CONNECTION);
2695                                 connect_change = 1;
2696                         }
2697
2698                         if (portchange & USB_PORT_STAT_C_ENABLE) {
2699                                 if (!connect_change)
2700                                         dev_dbg (hub_dev,
2701                                                 "port %d enable change, "
2702                                                 "status %08x\n",
2703                                                 i, portstatus);
2704                                 clear_port_feature(hdev, i,
2705                                         USB_PORT_FEAT_C_ENABLE);
2706
2707                                 /*
2708                                  * EM interference sometimes causes badly
2709                                  * shielded USB devices to be shutdown by
2710                                  * the hub, this hack enables them again.
2711                                  * Works at least with mouse driver. 
2712                                  */
2713                                 if (!(portstatus & USB_PORT_STAT_ENABLE)
2714                                     && !connect_change
2715                                     && hdev->children[i-1]) {
2716                                         dev_err (hub_dev,
2717                                             "port %i "
2718                                             "disabled by hub (EMI?), "
2719                                             "re-enabling...\n",
2720                                                 i);
2721                                         connect_change = 1;
2722                                 }
2723                         }
2724
2725                         if (portchange & USB_PORT_STAT_C_SUSPEND) {
2726                                 clear_port_feature(hdev, i,
2727                                         USB_PORT_FEAT_C_SUSPEND);
2728                                 if (hdev->children[i-1]) {
2729                                         ret = remote_wakeup(hdev->
2730                                                         children[i-1]);
2731                                         if (ret < 0)
2732                                                 connect_change = 1;
2733                                 } else {
2734                                         ret = -ENODEV;
2735                                         hub_port_disable(hub, i, 1);
2736                                 }
2737                                 dev_dbg (hub_dev,
2738                                         "resume on port %d, status %d\n",
2739                                         i, ret);
2740                         }
2741                         
2742                         if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2743                                 dev_err (hub_dev,
2744                                         "over-current change on port %d\n",
2745                                         i);
2746                                 clear_port_feature(hdev, i,
2747                                         USB_PORT_FEAT_C_OVER_CURRENT);
2748                                 hub_power_on(hub);
2749                         }
2750
2751                         if (portchange & USB_PORT_STAT_C_RESET) {
2752                                 dev_dbg (hub_dev,
2753                                         "reset change on port %d\n",
2754                                         i);
2755                                 clear_port_feature(hdev, i,
2756                                         USB_PORT_FEAT_C_RESET);
2757                         }
2758
2759                         if (connect_change)
2760                                 hub_port_connect_change(hub, i,
2761                                                 portstatus, portchange);
2762                 } /* end for i */
2763
2764                 /* deal with hub status changes */
2765                 if (test_and_clear_bit(0, hub->event_bits) == 0)
2766                         ;       /* do nothing */
2767                 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2768                         dev_err (hub_dev, "get_hub_status failed\n");
2769                 else {
2770                         if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2771                                 dev_dbg (hub_dev, "power change\n");
2772                                 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2773                                 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2774                                         /* FIXME: Is this always true? */
2775                                         hub->limited_power = 0;
2776                                 else
2777                                         hub->limited_power = 1;
2778                         }
2779                         if (hubchange & HUB_CHANGE_OVERCURRENT) {
2780                                 dev_dbg (hub_dev, "overcurrent change\n");
2781                                 msleep(500);    /* Cool down */
2782                                 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2783                                 hub_power_on(hub);
2784                         }
2785                 }
2786
2787                 hub->activating = 0;
2788
2789                 /* If this is a root hub, tell the HCD it's okay to
2790                  * re-enable port-change interrupts now. */
2791                 if (!hdev->parent && !hub->busy_bits[0])
2792                         usb_enable_root_hub_irq(hdev->bus);
2793
2794 loop_autopm:
2795                 /* Allow autosuspend if we're not going to run again */
2796                 if (list_empty(&hub->event_list))
2797                         usb_autopm_enable(intf);
2798 loop:
2799                 usb_unlock_device(hdev);
2800                 usb_put_intf(intf);
2801
2802         } /* end while (1) */
2803 }
2804
2805 static int hub_thread(void *__unused)
2806 {
2807         do {
2808                 hub_events();
2809                 wait_event_interruptible(khubd_wait,
2810                                 !list_empty(&hub_event_list) ||
2811                                 kthread_should_stop());
2812                 try_to_freeze();
2813         } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2814
2815         pr_debug("%s: khubd exiting\n", usbcore_name);
2816         return 0;
2817 }
2818
2819 static struct usb_device_id hub_id_table [] = {
2820     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2821       .bDeviceClass = USB_CLASS_HUB},
2822     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2823       .bInterfaceClass = USB_CLASS_HUB},
2824     { }                                         /* Terminating entry */
2825 };
2826
2827 MODULE_DEVICE_TABLE (usb, hub_id_table);
2828
2829 static struct usb_driver hub_driver = {
2830         .name =         "hub",
2831         .probe =        hub_probe,
2832         .disconnect =   hub_disconnect,
2833         .suspend =      hub_suspend,
2834         .resume =       hub_resume,
2835         .pre_reset =    hub_pre_reset,
2836         .post_reset =   hub_post_reset,
2837         .ioctl =        hub_ioctl,
2838         .id_table =     hub_id_table,
2839         .supports_autosuspend = 1,
2840 };
2841
2842 int usb_hub_init(void)
2843 {
2844         if (usb_register(&hub_driver) < 0) {
2845                 printk(KERN_ERR "%s: can't register hub driver\n",
2846                         usbcore_name);
2847                 return -1;
2848         }
2849
2850         khubd_task = kthread_run(hub_thread, NULL, "khubd");
2851         if (!IS_ERR(khubd_task))
2852                 return 0;
2853
2854         /* Fall through if kernel_thread failed */
2855         usb_deregister(&hub_driver);
2856         printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2857
2858         return -1;
2859 }
2860
2861 void usb_hub_cleanup(void)
2862 {
2863         kthread_stop(khubd_task);
2864
2865         /*
2866          * Hub resources are freed for us by usb_deregister. It calls
2867          * usb_driver_purge on every device which in turn calls that
2868          * devices disconnect function if it is using this driver.
2869          * The hub_disconnect function takes care of releasing the
2870          * individual hub resources. -greg
2871          */
2872         usb_deregister(&hub_driver);
2873 } /* usb_hub_cleanup() */
2874
2875 static int config_descriptors_changed(struct usb_device *udev)
2876 {
2877         unsigned                        index;
2878         unsigned                        len = 0;
2879         struct usb_config_descriptor    *buf;
2880
2881         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2882                 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2883                         len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2884         }
2885         buf = kmalloc (len, GFP_KERNEL);
2886         if (buf == NULL) {
2887                 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2888                 /* assume the worst */
2889                 return 1;
2890         }
2891         for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2892                 int length;
2893                 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2894
2895                 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2896                                 old_length);
2897                 if (length < old_length) {
2898                         dev_dbg(&udev->dev, "config index %d, error %d\n",
2899                                         index, length);
2900                         break;
2901                 }
2902                 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2903                                 != 0) {
2904                         dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2905                                 index, buf->bConfigurationValue);
2906                         break;
2907                 }
2908         }
2909         kfree(buf);
2910         return index != udev->descriptor.bNumConfigurations;
2911 }
2912
2913 /**
2914  * usb_reset_device - perform a USB port reset to reinitialize a device
2915  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2916  *
2917  * WARNING - don't use this routine to reset a composite device
2918  * (one with multiple interfaces owned by separate drivers)!
2919  * Use usb_reset_composite_device() instead.
2920  *
2921  * Do a port reset, reassign the device's address, and establish its
2922  * former operating configuration.  If the reset fails, or the device's
2923  * descriptors change from their values before the reset, or the original
2924  * configuration and altsettings cannot be restored, a flag will be set
2925  * telling khubd to pretend the device has been disconnected and then
2926  * re-connected.  All drivers will be unbound, and the device will be
2927  * re-enumerated and probed all over again.
2928  *
2929  * Returns 0 if the reset succeeded, -ENODEV if the device has been
2930  * flagged for logical disconnection, or some other negative error code
2931  * if the reset wasn't even attempted.
2932  *
2933  * The caller must own the device lock.  For example, it's safe to use
2934  * this from a driver probe() routine after downloading new firmware.
2935  * For calls that might not occur during probe(), drivers should lock
2936  * the device using usb_lock_device_for_reset().
2937  */
2938 int usb_reset_device(struct usb_device *udev)
2939 {
2940         struct usb_device               *parent_hdev = udev->parent;
2941         struct usb_hub                  *parent_hub;
2942         struct usb_device_descriptor    descriptor = udev->descriptor;
2943         int                             i, ret = 0;
2944         int                             port1 = udev->portnum;
2945
2946         if (udev->state == USB_STATE_NOTATTACHED ||
2947                         udev->state == USB_STATE_SUSPENDED) {
2948                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2949                                 udev->state);
2950                 return -EINVAL;
2951         }
2952
2953         if (!parent_hdev) {
2954                 /* this requires hcd-specific logic; see OHCI hc_restart() */
2955                 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2956                 return -EISDIR;
2957         }
2958         parent_hub = hdev_to_hub(parent_hdev);
2959
2960         set_bit(port1, parent_hub->busy_bits);
2961         for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2962
2963                 /* ep0 maxpacket size may change; let the HCD know about it.
2964                  * Other endpoints will be handled by re-enumeration. */
2965                 ep0_reinit(udev);
2966                 ret = hub_port_init(parent_hub, udev, port1, i);
2967                 if (ret >= 0)
2968                         break;
2969         }
2970         clear_bit(port1, parent_hub->busy_bits);
2971         if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2972                 usb_enable_root_hub_irq(parent_hdev->bus);
2973
2974         if (ret < 0)
2975                 goto re_enumerate;
2976  
2977         /* Device might have changed firmware (DFU or similar) */
2978         if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2979                         || config_descriptors_changed (udev)) {
2980                 dev_info(&udev->dev, "device firmware changed\n");
2981                 udev->descriptor = descriptor;  /* for disconnect() calls */
2982                 goto re_enumerate;
2983         }
2984   
2985         if (!udev->actconfig)
2986                 goto done;
2987
2988         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2989                         USB_REQ_SET_CONFIGURATION, 0,
2990                         udev->actconfig->desc.bConfigurationValue, 0,
2991                         NULL, 0, USB_CTRL_SET_TIMEOUT);
2992         if (ret < 0) {
2993                 dev_err(&udev->dev,
2994                         "can't restore configuration #%d (error=%d)\n",
2995                         udev->actconfig->desc.bConfigurationValue, ret);
2996                 goto re_enumerate;
2997         }
2998         usb_set_device_state(udev, USB_STATE_CONFIGURED);
2999
3000         for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3001                 struct usb_interface *intf = udev->actconfig->interface[i];
3002                 struct usb_interface_descriptor *desc;
3003
3004                 /* set_interface resets host side toggle even
3005                  * for altsetting zero.  the interface may have no driver.
3006                  */
3007                 desc = &intf->cur_altsetting->desc;
3008                 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3009                         desc->bAlternateSetting);
3010                 if (ret < 0) {
3011                         dev_err(&udev->dev, "failed to restore interface %d "
3012                                 "altsetting %d (error=%d)\n",
3013                                 desc->bInterfaceNumber,
3014                                 desc->bAlternateSetting,
3015                                 ret);
3016                         goto re_enumerate;
3017                 }
3018         }
3019
3020 done:
3021         return 0;
3022  
3023 re_enumerate:
3024         hub_port_logical_disconnect(parent_hub, port1);
3025         return -ENODEV;
3026 }
3027 EXPORT_SYMBOL(usb_reset_device);
3028
3029 /**
3030  * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3031  * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3032  * @iface: interface bound to the driver making the request (optional)
3033  *
3034  * Warns all drivers bound to registered interfaces (using their pre_reset
3035  * method), performs the port reset, and then lets the drivers know that
3036  * the reset is over (using their post_reset method).
3037  *
3038  * Return value is the same as for usb_reset_device().
3039  *
3040  * The caller must own the device lock.  For example, it's safe to use
3041  * this from a driver probe() routine after downloading new firmware.
3042  * For calls that might not occur during probe(), drivers should lock
3043  * the device using usb_lock_device_for_reset().
3044  *
3045  * The interface locks are acquired during the pre_reset stage and released
3046  * during the post_reset stage.  However if iface is not NULL and is
3047  * currently being probed, we assume that the caller already owns its
3048  * lock.
3049  */
3050 int usb_reset_composite_device(struct usb_device *udev,
3051                 struct usb_interface *iface)
3052 {
3053         int ret;
3054         struct usb_host_config *config = udev->actconfig;
3055
3056         if (udev->state == USB_STATE_NOTATTACHED ||
3057                         udev->state == USB_STATE_SUSPENDED) {
3058                 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3059                                 udev->state);
3060                 return -EINVAL;
3061         }
3062
3063         /* Prevent autosuspend during the reset */
3064         usb_autoresume_device(udev);
3065
3066         if (iface && iface->condition != USB_INTERFACE_BINDING)
3067                 iface = NULL;
3068
3069         if (config) {
3070                 int i;
3071                 struct usb_interface *cintf;
3072                 struct usb_driver *drv;
3073
3074                 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3075                         cintf = config->interface[i];
3076                         if (cintf != iface)
3077                                 down(&cintf->dev.sem);
3078                         if (device_is_registered(&cintf->dev) &&
3079                                         cintf->dev.driver) {
3080                                 drv = to_usb_driver(cintf->dev.driver);
3081                                 if (drv->pre_reset)
3082                                         (drv->pre_reset)(cintf);
3083                         }
3084                 }
3085         }
3086
3087         ret = usb_reset_device(udev);
3088
3089         if (config) {
3090                 int i;
3091                 struct usb_interface *cintf;
3092                 struct usb_driver *drv;
3093
3094                 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3095                         cintf = config->interface[i];
3096                         if (device_is_registered(&cintf->dev) &&
3097                                         cintf->dev.driver) {
3098                                 drv = to_usb_driver(cintf->dev.driver);
3099                                 if (drv->post_reset)
3100                                         (drv->post_reset)(cintf);
3101                         }
3102                         if (cintf != iface)
3103                                 up(&cintf->dev.sem);
3104                 }
3105         }
3106
3107         usb_autosuspend_device(udev);
3108         return ret;
3109 }
3110 EXPORT_SYMBOL(usb_reset_composite_device);