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[PATCH] USB: remove .owner field from struct usb_driver
[linux-2.6/verdex.git] / drivers / usb / core / hub.c
blob40c6c50c6bd9ce2b9888a980805d3174099f819d
1 /*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
11 #include <linux/config.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/completion.h>
17 #include <linux/sched.h>
18 #include <linux/list.h>
19 #include <linux/slab.h>
20 #include <linux/smp_lock.h>
21 #include <linux/ioctl.h>
22 #include <linux/usb.h>
23 #include <linux/usbdevice_fs.h>
24 #include <linux/kthread.h>
25
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
29
30 #include "usb.h"
31 #include "hcd.h"
32 #include "hub.h"
33
34 /* Protect struct usb_device->state and ->children members
35 * Note: Both are also protected by ->serialize, except that ->state can
36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37 static DEFINE_SPINLOCK(device_state_lock);
38
39 /* khubd's worklist and its lock */
40 static DEFINE_SPINLOCK(hub_event_lock);
41 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
42
43 /* Wakes up khubd */
44 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
46 static struct task_struct *khubd_task;
47
48 /* cycle leds on hubs that aren't blinking for attention */
49 static int blinkenlights = 0;
50 module_param (blinkenlights, bool, S_IRUGO);
51 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53 /*
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
60 *
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
66 */
67 static int old_scheme_first = 0;
68 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(old_scheme_first,
70 "start with the old device initialization scheme");
71
72 static int use_both_schemes = 1;
73 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74 MODULE_PARM_DESC(use_both_schemes,
75 "try the other device initialization scheme if the "
76 "first one fails");
77
78
79 #ifdef DEBUG
80 static inline char *portspeed (int portstatus)
81 {
82 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83 return "480 Mb/s";
84 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85 return "1.5 Mb/s";
86 else
87 return "12 Mb/s";
88 }
89 #endif
90
91 /* Note that hdev or one of its children must be locked! */
92 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93 {
94 return usb_get_intfdata(hdev->actconfig->interface[0]);
95 }
96
97 /* USB 2.0 spec Section 11.24.4.5 */
98 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99 {
100 int i, ret;
101
102 for (i = 0; i < 3; i++) {
103 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105 USB_DT_HUB << 8, 0, data, size,
106 USB_CTRL_GET_TIMEOUT);
107 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108 return ret;
109 }
110 return -EINVAL;
111 }
112
113 /*
114 * USB 2.0 spec Section 11.24.2.1
115 */
116 static int clear_hub_feature(struct usb_device *hdev, int feature)
117 {
118 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120 }
121
122 /*
123 * USB 2.0 spec Section 11.24.2.2
124 */
125 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126 {
127 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129 NULL, 0, 1000);
130 }
131
132 /*
133 * USB 2.0 spec Section 11.24.2.13
134 */
135 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136 {
137 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139 NULL, 0, 1000);
140 }
141
142 /*
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
145 */
146 static void set_port_led(
147 struct usb_hub *hub,
148 int port1,
149 int selector
150 )
151 {
152 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153 USB_PORT_FEAT_INDICATOR);
154 if (status < 0)
155 dev_dbg (hub->intfdev,
156 "port %d indicator %s status %d\n",
157 port1,
158 ({ char *s; switch (selector) {
159 case HUB_LED_AMBER: s = "amber"; break;
160 case HUB_LED_GREEN: s = "green"; break;
161 case HUB_LED_OFF: s = "off"; break;
162 case HUB_LED_AUTO: s = "auto"; break;
163 default: s = "??"; break;
164 }; s; }),
165 status);
166 }
167
168 #define LED_CYCLE_PERIOD ((2*HZ)/3)
169
170 static void led_work (void *__hub)
171 {
172 struct usb_hub *hub = __hub;
173 struct usb_device *hdev = hub->hdev;
174 unsigned i;
175 unsigned changed = 0;
176 int cursor = -1;
177
178 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179 return;
180
181 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182 unsigned selector, mode;
183
184 /* 30%-50% duty cycle */
185
186 switch (hub->indicator[i]) {
187 /* cycle marker */
188 case INDICATOR_CYCLE:
189 cursor = i;
190 selector = HUB_LED_AUTO;
191 mode = INDICATOR_AUTO;
192 break;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK:
195 selector = HUB_LED_GREEN;
196 mode = INDICATOR_GREEN_BLINK_OFF;
197 break;
198 case INDICATOR_GREEN_BLINK_OFF:
199 selector = HUB_LED_OFF;
200 mode = INDICATOR_GREEN_BLINK;
201 break;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK:
204 selector = HUB_LED_AMBER;
205 mode = INDICATOR_AMBER_BLINK_OFF;
206 break;
207 case INDICATOR_AMBER_BLINK_OFF:
208 selector = HUB_LED_OFF;
209 mode = INDICATOR_AMBER_BLINK;
210 break;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK:
213 selector = HUB_LED_GREEN;
214 mode = INDICATOR_ALT_BLINK_OFF;
215 break;
216 case INDICATOR_ALT_BLINK_OFF:
217 selector = HUB_LED_AMBER;
218 mode = INDICATOR_ALT_BLINK;
219 break;
220 default:
221 continue;
222 }
223 if (selector != HUB_LED_AUTO)
224 changed = 1;
225 set_port_led(hub, i + 1, selector);
226 hub->indicator[i] = mode;
227 }
228 if (!changed && blinkenlights) {
229 cursor++;
230 cursor %= hub->descriptor->bNbrPorts;
231 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232 hub->indicator[cursor] = INDICATOR_CYCLE;
233 changed++;
234 }
235 if (changed)
236 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237 }
238
239 /* use a short timeout for hub/port status fetches */
240 #define USB_STS_TIMEOUT 1000
241 #define USB_STS_RETRIES 5
242
243 /*
244 * USB 2.0 spec Section 11.24.2.6
245 */
246 static int get_hub_status(struct usb_device *hdev,
247 struct usb_hub_status *data)
248 {
249 int i, status = -ETIMEDOUT;
250
251 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254 data, sizeof(*data), USB_STS_TIMEOUT);
255 }
256 return status;
257 }
258
259 /*
260 * USB 2.0 spec Section 11.24.2.7
261 */
262 static int get_port_status(struct usb_device *hdev, int port1,
263 struct usb_port_status *data)
264 {
265 int i, status = -ETIMEDOUT;
266
267 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270 data, sizeof(*data), USB_STS_TIMEOUT);
271 }
272 return status;
273 }
274
275 static void kick_khubd(struct usb_hub *hub)
276 {
277 unsigned long flags;
278
279 spin_lock_irqsave(&hub_event_lock, flags);
280 if (list_empty(&hub->event_list)) {
281 list_add_tail(&hub->event_list, &hub_event_list);
282 wake_up(&khubd_wait);
283 }
284 spin_unlock_irqrestore(&hub_event_lock, flags);
285 }
286
287 void usb_kick_khubd(struct usb_device *hdev)
288 {
289 kick_khubd(hdev_to_hub(hdev));
290 }
291
292
293 /* completion function, fires on port status changes and various faults */
294 static void hub_irq(struct urb *urb, struct pt_regs *regs)
295 {
296 struct usb_hub *hub = (struct usb_hub *)urb->context;
297 int status;
298 int i;
299 unsigned long bits;
300
301 switch (urb->status) {
302 case -ENOENT: /* synchronous unlink */
303 case -ECONNRESET: /* async unlink */
304 case -ESHUTDOWN: /* hardware going away */
305 return;
306
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310 if ((++hub->nerrors < 10) || hub->error)
311 goto resubmit;
312 hub->error = urb->status;
313 /* FALL THROUGH */
314
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
317 bits = 0;
318 for (i = 0; i < urb->actual_length; ++i)
319 bits |= ((unsigned long) ((*hub->buffer)[i]))
320 << (i*8);
321 hub->event_bits[0] = bits;
322 break;
323 }
324
325 hub->nerrors = 0;
326
327 /* Something happened, let khubd figure it out */
328 kick_khubd(hub);
329
330 resubmit:
331 if (hub->quiescing)
332 return;
333
334 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335 && status != -ENODEV && status != -EPERM)
336 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337 }
338
339 /* USB 2.0 spec Section 11.24.2.3 */
340 static inline int
341 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342 {
343 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345 tt, NULL, 0, 1000);
346 }
347
348 /*
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
353 */
354 static void hub_tt_kevent (void *arg)
355 {
356 struct usb_hub *hub = arg;
357 unsigned long flags;
358
359 spin_lock_irqsave (&hub->tt.lock, flags);
360 while (!list_empty (&hub->tt.clear_list)) {
361 struct list_head *temp;
362 struct usb_tt_clear *clear;
363 struct usb_device *hdev = hub->hdev;
364 int status;
365
366 temp = hub->tt.clear_list.next;
367 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368 list_del (&clear->clear_list);
369
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub->tt.lock, flags);
372 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373 spin_lock_irqsave (&hub->tt.lock, flags);
374
375 if (status)
376 dev_err (&hdev->dev,
377 "clear tt %d (%04x) error %d\n",
378 clear->tt, clear->devinfo, status);
379 kfree(clear);
380 }
381 spin_unlock_irqrestore (&hub->tt.lock, flags);
382 }
383
384 /**
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
388 *
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
392 * interrupt context.
393 *
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
396 */
397 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398 {
399 struct usb_tt *tt = udev->tt;
400 unsigned long flags;
401 struct usb_tt_clear *clear;
402
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
406 */
407 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
410 return;
411 }
412
413 /* info that CLEAR_TT_BUFFER needs */
414 clear->tt = tt->multi ? udev->ttport : 1;
415 clear->devinfo = usb_pipeendpoint (pipe);
416 clear->devinfo |= udev->devnum << 4;
417 clear->devinfo |= usb_pipecontrol (pipe)
418 ? (USB_ENDPOINT_XFER_CONTROL << 11)
419 : (USB_ENDPOINT_XFER_BULK << 11);
420 if (usb_pipein (pipe))
421 clear->devinfo |= 1 << 15;
422
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt->lock, flags);
425 list_add_tail (&clear->clear_list, &tt->clear_list);
426 schedule_work (&tt->kevent);
427 spin_unlock_irqrestore (&tt->lock, flags);
428 }
429
430 static void hub_power_on(struct usb_hub *hub)
431 {
432 int port1;
433 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
434 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
435
436 /* if hub supports power switching, enable power on each port */
437 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
438 dev_dbg(hub->intfdev, "enabling power on all ports\n");
439 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
440 set_port_feature(hub->hdev, port1,
441 USB_PORT_FEAT_POWER);
442 }
443
444 /* Wait at least 100 msec for power to become stable */
445 msleep(max(pgood_delay, (unsigned) 100));
446 }
447
448 static inline void __hub_quiesce(struct usb_hub *hub)
449 {
450 /* (nonblocking) khubd and related activity won't re-trigger */
451 hub->quiescing = 1;
452 hub->activating = 0;
453 hub->resume_root_hub = 0;
454 }
455
456 static void hub_quiesce(struct usb_hub *hub)
457 {
458 /* (blocking) stop khubd and related activity */
459 __hub_quiesce(hub);
460 usb_kill_urb(hub->urb);
461 if (hub->has_indicators)
462 cancel_delayed_work(&hub->leds);
463 if (hub->has_indicators || hub->tt.hub)
464 flush_scheduled_work();
465 }
466
467 static void hub_activate(struct usb_hub *hub)
468 {
469 int status;
470
471 hub->quiescing = 0;
472 hub->activating = 1;
473 hub->resume_root_hub = 0;
474 status = usb_submit_urb(hub->urb, GFP_NOIO);
475 if (status < 0)
476 dev_err(hub->intfdev, "activate --> %d\n", status);
477 if (hub->has_indicators && blinkenlights)
478 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
479
480 /* scan all ports ASAP */
481 kick_khubd(hub);
482 }
483
484 static int hub_hub_status(struct usb_hub *hub,
485 u16 *status, u16 *change)
486 {
487 int ret;
488
489 ret = get_hub_status(hub->hdev, &hub->status->hub);
490 if (ret < 0)
491 dev_err (hub->intfdev,
492 "%s failed (err = %d)\n", __FUNCTION__, ret);
493 else {
494 *status = le16_to_cpu(hub->status->hub.wHubStatus);
495 *change = le16_to_cpu(hub->status->hub.wHubChange);
496 ret = 0;
497 }
498 return ret;
499 }
500
501 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
502 {
503 struct usb_device *hdev = hub->hdev;
504 int ret;
505
506 if (hdev->children[port1-1] && set_state) {
507 usb_set_device_state(hdev->children[port1-1],
508 USB_STATE_NOTATTACHED);
509 }
510 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
511 if (ret)
512 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
513 port1, ret);
514
515 return ret;
516 }
517
518 static int hub_configure(struct usb_hub *hub,
519 struct usb_endpoint_descriptor *endpoint)
520 {
521 struct usb_device *hdev = hub->hdev;
522 struct device *hub_dev = hub->intfdev;
523 u16 hubstatus, hubchange;
524 u16 wHubCharacteristics;
525 unsigned int pipe;
526 int maxp, ret;
527 char *message;
528
529 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
530 &hub->buffer_dma);
531 if (!hub->buffer) {
532 message = "can't allocate hub irq buffer";
533 ret = -ENOMEM;
534 goto fail;
535 }
536
537 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
538 if (!hub->status) {
539 message = "can't kmalloc hub status buffer";
540 ret = -ENOMEM;
541 goto fail;
542 }
543
544 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
545 if (!hub->descriptor) {
546 message = "can't kmalloc hub descriptor";
547 ret = -ENOMEM;
548 goto fail;
549 }
550
551 /* Request the entire hub descriptor.
552 * hub->descriptor can handle USB_MAXCHILDREN ports,
553 * but the hub can/will return fewer bytes here.
554 */
555 ret = get_hub_descriptor(hdev, hub->descriptor,
556 sizeof(*hub->descriptor));
557 if (ret < 0) {
558 message = "can't read hub descriptor";
559 goto fail;
560 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
561 message = "hub has too many ports!";
562 ret = -ENODEV;
563 goto fail;
564 }
565
566 hdev->maxchild = hub->descriptor->bNbrPorts;
567 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
568 (hdev->maxchild == 1) ? "" : "s");
569
570 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
571
572 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
573 int i;
574 char portstr [USB_MAXCHILDREN + 1];
575
576 for (i = 0; i < hdev->maxchild; i++)
577 portstr[i] = hub->descriptor->DeviceRemovable
578 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
579 ? 'F' : 'R';
580 portstr[hdev->maxchild] = 0;
581 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
582 } else
583 dev_dbg(hub_dev, "standalone hub\n");
584
585 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
586 case 0x00:
587 dev_dbg(hub_dev, "ganged power switching\n");
588 break;
589 case 0x01:
590 dev_dbg(hub_dev, "individual port power switching\n");
591 break;
592 case 0x02:
593 case 0x03:
594 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
595 break;
596 }
597
598 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
599 case 0x00:
600 dev_dbg(hub_dev, "global over-current protection\n");
601 break;
602 case 0x08:
603 dev_dbg(hub_dev, "individual port over-current protection\n");
604 break;
605 case 0x10:
606 case 0x18:
607 dev_dbg(hub_dev, "no over-current protection\n");
608 break;
609 }
610
611 spin_lock_init (&hub->tt.lock);
612 INIT_LIST_HEAD (&hub->tt.clear_list);
613 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
614 switch (hdev->descriptor.bDeviceProtocol) {
615 case 0:
616 break;
617 case 1:
618 dev_dbg(hub_dev, "Single TT\n");
619 hub->tt.hub = hdev;
620 break;
621 case 2:
622 ret = usb_set_interface(hdev, 0, 1);
623 if (ret == 0) {
624 dev_dbg(hub_dev, "TT per port\n");
625 hub->tt.multi = 1;
626 } else
627 dev_err(hub_dev, "Using single TT (err %d)\n",
628 ret);
629 hub->tt.hub = hdev;
630 break;
631 default:
632 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
633 hdev->descriptor.bDeviceProtocol);
634 break;
635 }
636
637 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
638 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
639 case HUB_TTTT_8_BITS:
640 if (hdev->descriptor.bDeviceProtocol != 0) {
641 hub->tt.think_time = 666;
642 dev_dbg(hub_dev, "TT requires at most %d "
643 "FS bit times (%d ns)\n",
644 8, hub->tt.think_time);
645 }
646 break;
647 case HUB_TTTT_16_BITS:
648 hub->tt.think_time = 666 * 2;
649 dev_dbg(hub_dev, "TT requires at most %d "
650 "FS bit times (%d ns)\n",
651 16, hub->tt.think_time);
652 break;
653 case HUB_TTTT_24_BITS:
654 hub->tt.think_time = 666 * 3;
655 dev_dbg(hub_dev, "TT requires at most %d "
656 "FS bit times (%d ns)\n",
657 24, hub->tt.think_time);
658 break;
659 case HUB_TTTT_32_BITS:
660 hub->tt.think_time = 666 * 4;
661 dev_dbg(hub_dev, "TT requires at most %d "
662 "FS bit times (%d ns)\n",
663 32, hub->tt.think_time);
664 break;
665 }
666
667 /* probe() zeroes hub->indicator[] */
668 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
669 hub->has_indicators = 1;
670 dev_dbg(hub_dev, "Port indicators are supported\n");
671 }
672
673 dev_dbg(hub_dev, "power on to power good time: %dms\n",
674 hub->descriptor->bPwrOn2PwrGood * 2);
675
676 /* power budgeting mostly matters with bus-powered hubs,
677 * and battery-powered root hubs (may provide just 8 mA).
678 */
679 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
680 if (ret < 0) {
681 message = "can't get hub status";
682 goto fail;
683 }
684 le16_to_cpus(&hubstatus);
685 if (hdev == hdev->bus->root_hub) {
686 struct usb_hcd *hcd =
687 container_of(hdev->bus, struct usb_hcd, self);
688
689 hub->power_budget = min(500u, hcd->power_budget) / 2;
690 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
691 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
692 hub->descriptor->bHubContrCurrent);
693 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
694 / 2;
695 }
696 if (hub->power_budget)
697 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
698 hub->power_budget * 2);
699
700
701 ret = hub_hub_status(hub, &hubstatus, &hubchange);
702 if (ret < 0) {
703 message = "can't get hub status";
704 goto fail;
705 }
706
707 /* local power status reports aren't always correct */
708 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
709 dev_dbg(hub_dev, "local power source is %s\n",
710 (hubstatus & HUB_STATUS_LOCAL_POWER)
711 ? "lost (inactive)" : "good");
712
713 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
714 dev_dbg(hub_dev, "%sover-current condition exists\n",
715 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
716
717 /* set up the interrupt endpoint */
718 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
719 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
720
721 if (maxp > sizeof(*hub->buffer))
722 maxp = sizeof(*hub->buffer);
723
724 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
725 if (!hub->urb) {
726 message = "couldn't allocate interrupt urb";
727 ret = -ENOMEM;
728 goto fail;
729 }
730
731 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
732 hub, endpoint->bInterval);
733 hub->urb->transfer_dma = hub->buffer_dma;
734 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
735
736 /* maybe cycle the hub leds */
737 if (hub->has_indicators && blinkenlights)
738 hub->indicator [0] = INDICATOR_CYCLE;
739
740 hub_power_on(hub);
741 hub_activate(hub);
742 return 0;
743
744 fail:
745 dev_err (hub_dev, "config failed, %s (err %d)\n",
746 message, ret);
747 /* hub_disconnect() frees urb and descriptor */
748 return ret;
749 }
750
751 static unsigned highspeed_hubs;
752
753 /* Called after the hub driver is unbound from a hub with children */
754 static void hub_remove_children_work(void *__hub)
755 {
756 struct usb_hub *hub = __hub;
757 struct usb_device *hdev = hub->hdev;
758 int i;
759
760 kfree(hub);
761
762 usb_lock_device(hdev);
763 for (i = 0; i < hdev->maxchild; ++i) {
764 if (hdev->children[i])
765 usb_disconnect(&hdev->children[i]);
766 }
767 usb_unlock_device(hdev);
768 usb_put_dev(hdev);
769 }
770
771 static void hub_disconnect(struct usb_interface *intf)
772 {
773 struct usb_hub *hub = usb_get_intfdata (intf);
774 struct usb_device *hdev;
775 int n, port1;
776
777 usb_set_intfdata (intf, NULL);
778 hdev = hub->hdev;
779
780 if (hdev->speed == USB_SPEED_HIGH)
781 highspeed_hubs--;
782
783 hub_quiesce(hub);
784 usb_free_urb(hub->urb);
785 hub->urb = NULL;
786
787 spin_lock_irq(&hub_event_lock);
788 list_del_init(&hub->event_list);
789 spin_unlock_irq(&hub_event_lock);
790
791 kfree(hub->descriptor);
792 hub->descriptor = NULL;
793
794 kfree(hub->status);
795 hub->status = NULL;
796
797 if (hub->buffer) {
798 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
799 hub->buffer_dma);
800 hub->buffer = NULL;
801 }
802
803 /* If there are any children then this is an unbind only, not a
804 * physical disconnection. The active ports must be disabled
805 * and later on we must call usb_disconnect(). We can't call
806 * it now because we may not hold the hub's device lock.
807 */
808 n = 0;
809 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
810 if (hdev->children[port1 - 1]) {
811 ++n;
812 hub_port_disable(hub, port1, 1);
813 }
814 }
815
816 if (n == 0)
817 kfree(hub);
818 else {
819 /* Reuse the hub->leds work_struct for our own purposes */
820 INIT_WORK(&hub->leds, hub_remove_children_work, hub);
821 schedule_work(&hub->leds);
822 usb_get_dev(hdev);
823 }
824 }
825
826 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
827 {
828 struct usb_host_interface *desc;
829 struct usb_endpoint_descriptor *endpoint;
830 struct usb_device *hdev;
831 struct usb_hub *hub;
832
833 desc = intf->cur_altsetting;
834 hdev = interface_to_usbdev(intf);
835
836 /* Some hubs have a subclass of 1, which AFAICT according to the */
837 /* specs is not defined, but it works */
838 if ((desc->desc.bInterfaceSubClass != 0) &&
839 (desc->desc.bInterfaceSubClass != 1)) {
840 descriptor_error:
841 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
842 return -EIO;
843 }
844
845 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
846 if (desc->desc.bNumEndpoints != 1)
847 goto descriptor_error;
848
849 endpoint = &desc->endpoint[0].desc;
850
851 /* Output endpoint? Curiouser and curiouser.. */
852 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
853 goto descriptor_error;
854
855 /* If it's not an interrupt endpoint, we'd better punt! */
856 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
857 != USB_ENDPOINT_XFER_INT)
858 goto descriptor_error;
859
860 /* We found a hub */
861 dev_info (&intf->dev, "USB hub found\n");
862
863 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
864 if (!hub) {
865 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
866 return -ENOMEM;
867 }
868
869 INIT_LIST_HEAD(&hub->event_list);
870 hub->intfdev = &intf->dev;
871 hub->hdev = hdev;
872 INIT_WORK(&hub->leds, led_work, hub);
873
874 usb_set_intfdata (intf, hub);
875
876 if (hdev->speed == USB_SPEED_HIGH)
877 highspeed_hubs++;
878
879 if (hub_configure(hub, endpoint) >= 0)
880 return 0;
881
882 hub_disconnect (intf);
883 return -ENODEV;
884 }
885
886 static int
887 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
888 {
889 struct usb_device *hdev = interface_to_usbdev (intf);
890
891 /* assert ifno == 0 (part of hub spec) */
892 switch (code) {
893 case USBDEVFS_HUB_PORTINFO: {
894 struct usbdevfs_hub_portinfo *info = user_data;
895 int i;
896
897 spin_lock_irq(&device_state_lock);
898 if (hdev->devnum <= 0)
899 info->nports = 0;
900 else {
901 info->nports = hdev->maxchild;
902 for (i = 0; i < info->nports; i++) {
903 if (hdev->children[i] == NULL)
904 info->port[i] = 0;
905 else
906 info->port[i] =
907 hdev->children[i]->devnum;
908 }
909 }
910 spin_unlock_irq(&device_state_lock);
911
912 return info->nports + 1;
913 }
914
915 default:
916 return -ENOSYS;
917 }
918 }
919
920 /* caller has locked the hub device */
921 static void hub_pre_reset(struct usb_hub *hub)
922 {
923 struct usb_device *hdev = hub->hdev;
924 int i;
925
926 for (i = 0; i < hdev->maxchild; ++i) {
927 if (hdev->children[i])
928 usb_disconnect(&hdev->children[i]);
929 }
930 hub_quiesce(hub);
931 }
932
933 /* caller has locked the hub device */
934 static void hub_post_reset(struct usb_hub *hub)
935 {
936 hub_activate(hub);
937 hub_power_on(hub);
938 }
939
940
941 /* grab device/port lock, returning index of that port (zero based).
942 * protects the upstream link used by this device from concurrent
943 * tree operations like suspend, resume, reset, and disconnect, which
944 * apply to everything downstream of a given port.
945 */
946 static int locktree(struct usb_device *udev)
947 {
948 int t;
949 struct usb_device *hdev;
950
951 if (!udev)
952 return -ENODEV;
953
954 /* root hub is always the first lock in the series */
955 hdev = udev->parent;
956 if (!hdev) {
957 usb_lock_device(udev);
958 return 0;
959 }
960
961 /* on the path from root to us, lock everything from
962 * top down, dropping parent locks when not needed
963 */
964 t = locktree(hdev);
965 if (t < 0)
966 return t;
967 for (t = 0; t < hdev->maxchild; t++) {
968 if (hdev->children[t] == udev) {
969 /* everything is fail-fast once disconnect
970 * processing starts
971 */
972 if (udev->state == USB_STATE_NOTATTACHED)
973 break;
974
975 /* when everyone grabs locks top->bottom,
976 * non-overlapping work may be concurrent
977 */
978 down(&udev->serialize);
979 up(&hdev->serialize);
980 return t + 1;
981 }
982 }
983 usb_unlock_device(hdev);
984 return -ENODEV;
985 }
986
987 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
988 {
989 int i;
990
991 for (i = 0; i < udev->maxchild; ++i) {
992 if (udev->children[i])
993 recursively_mark_NOTATTACHED(udev->children[i]);
994 }
995 udev->state = USB_STATE_NOTATTACHED;
996 }
997
998 /**
999 * usb_set_device_state - change a device's current state (usbcore, hcds)
1000 * @udev: pointer to device whose state should be changed
1001 * @new_state: new state value to be stored
1002 *
1003 * udev->state is _not_ fully protected by the device lock. Although
1004 * most transitions are made only while holding the lock, the state can
1005 * can change to USB_STATE_NOTATTACHED at almost any time. This
1006 * is so that devices can be marked as disconnected as soon as possible,
1007 * without having to wait for any semaphores to be released. As a result,
1008 * all changes to any device's state must be protected by the
1009 * device_state_lock spinlock.
1010 *
1011 * Once a device has been added to the device tree, all changes to its state
1012 * should be made using this routine. The state should _not_ be set directly.
1013 *
1014 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1015 * Otherwise udev->state is set to new_state, and if new_state is
1016 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1017 * to USB_STATE_NOTATTACHED.
1018 */
1019 void usb_set_device_state(struct usb_device *udev,
1020 enum usb_device_state new_state)
1021 {
1022 unsigned long flags;
1023
1024 spin_lock_irqsave(&device_state_lock, flags);
1025 if (udev->state == USB_STATE_NOTATTACHED)
1026 ; /* do nothing */
1027 else if (new_state != USB_STATE_NOTATTACHED) {
1028 udev->state = new_state;
1029 if (new_state == USB_STATE_CONFIGURED)
1030 device_init_wakeup(&udev->dev,
1031 (udev->actconfig->desc.bmAttributes
1032 & USB_CONFIG_ATT_WAKEUP));
1033 else if (new_state != USB_STATE_SUSPENDED)
1034 device_init_wakeup(&udev->dev, 0);
1035 } else
1036 recursively_mark_NOTATTACHED(udev);
1037 spin_unlock_irqrestore(&device_state_lock, flags);
1038 }
1039 EXPORT_SYMBOL(usb_set_device_state);
1040
1041
1042 #ifdef CONFIG_PM
1043
1044 /**
1045 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1046 * @rhdev: struct usb_device for the root hub
1047 *
1048 * The USB host controller driver calls this function when its root hub
1049 * is resumed and Vbus power has been interrupted or the controller
1050 * has been reset. The routine marks all the children of the root hub
1051 * as NOTATTACHED and marks logical connect-change events on their ports.
1052 */
1053 void usb_root_hub_lost_power(struct usb_device *rhdev)
1054 {
1055 struct usb_hub *hub;
1056 int port1;
1057 unsigned long flags;
1058
1059 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1060 spin_lock_irqsave(&device_state_lock, flags);
1061 hub = hdev_to_hub(rhdev);
1062 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1063 if (rhdev->children[port1 - 1]) {
1064 recursively_mark_NOTATTACHED(
1065 rhdev->children[port1 - 1]);
1066 set_bit(port1, hub->change_bits);
1067 }
1068 }
1069 spin_unlock_irqrestore(&device_state_lock, flags);
1070 }
1071 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1072
1073 #endif
1074
1075 static void choose_address(struct usb_device *udev)
1076 {
1077 int devnum;
1078 struct usb_bus *bus = udev->bus;
1079
1080 /* If khubd ever becomes multithreaded, this will need a lock */
1081
1082 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1083 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1084 bus->devnum_next);
1085 if (devnum >= 128)
1086 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1087
1088 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1089
1090 if (devnum < 128) {
1091 set_bit(devnum, bus->devmap.devicemap);
1092 udev->devnum = devnum;
1093 }
1094 }
1095
1096 static void release_address(struct usb_device *udev)
1097 {
1098 if (udev->devnum > 0) {
1099 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1100 udev->devnum = -1;
1101 }
1102 }
1103
1104 /**
1105 * usb_disconnect - disconnect a device (usbcore-internal)
1106 * @pdev: pointer to device being disconnected
1107 * Context: !in_interrupt ()
1108 *
1109 * Something got disconnected. Get rid of it and all of its children.
1110 *
1111 * If *pdev is a normal device then the parent hub must already be locked.
1112 * If *pdev is a root hub then this routine will acquire the
1113 * usb_bus_list_lock on behalf of the caller.
1114 *
1115 * Only hub drivers (including virtual root hub drivers for host
1116 * controllers) should ever call this.
1117 *
1118 * This call is synchronous, and may not be used in an interrupt context.
1119 */
1120 void usb_disconnect(struct usb_device **pdev)
1121 {
1122 struct usb_device *udev = *pdev;
1123 int i;
1124
1125 if (!udev) {
1126 pr_debug ("%s nodev\n", __FUNCTION__);
1127 return;
1128 }
1129
1130 /* mark the device as inactive, so any further urb submissions for
1131 * this device (and any of its children) will fail immediately.
1132 * this quiesces everyting except pending urbs.
1133 */
1134 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1135
1136 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1137 if (!udev->parent) {
1138 down(&usb_bus_list_lock);
1139 usb_lock_device(udev);
1140 } else
1141 down(&udev->serialize);
1142
1143 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1144
1145 /* Free up all the children before we remove this device */
1146 for (i = 0; i < USB_MAXCHILDREN; i++) {
1147 if (udev->children[i])
1148 usb_disconnect(&udev->children[i]);
1149 }
1150
1151 /* deallocate hcd/hardware state ... nuking all pending urbs and
1152 * cleaning up all state associated with the current configuration
1153 * so that the hardware is now fully quiesced.
1154 */
1155 usb_disable_device(udev, 0);
1156
1157 usb_notify_remove_device(udev);
1158
1159 /* Free the device number, remove the /proc/bus/usb entry and
1160 * the sysfs attributes, and delete the parent's children[]
1161 * (or root_hub) pointer.
1162 */
1163 dev_dbg (&udev->dev, "unregistering device\n");
1164 release_address(udev);
1165 usb_remove_sysfs_dev_files(udev);
1166
1167 /* Avoid races with recursively_mark_NOTATTACHED() */
1168 spin_lock_irq(&device_state_lock);
1169 *pdev = NULL;
1170 spin_unlock_irq(&device_state_lock);
1171
1172 if (!udev->parent) {
1173 usb_unlock_device(udev);
1174 up(&usb_bus_list_lock);
1175 } else
1176 up(&udev->serialize);
1177
1178 device_unregister(&udev->dev);
1179 }
1180
1181 static int choose_configuration(struct usb_device *udev)
1182 {
1183 int c, i;
1184
1185 /* NOTE: this should interact with hub power budgeting */
1186
1187 c = udev->config[0].desc.bConfigurationValue;
1188 if (udev->descriptor.bNumConfigurations != 1) {
1189 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1190 struct usb_interface_descriptor *desc;
1191
1192 /* heuristic: Linux is more likely to have class
1193 * drivers, so avoid vendor-specific interfaces.
1194 */
1195 desc = &udev->config[i].intf_cache[0]
1196 ->altsetting->desc;
1197 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1198 continue;
1199 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1200 * MSFT needs this to be the first config; never use
1201 * it as the default unless Linux has host-side RNDIS.
1202 * A second config would ideally be CDC-Ethernet, but
1203 * may instead be the "vendor specific" CDC subset
1204 * long used by ARM Linux for sa1100 or pxa255.
1205 */
1206 if (desc->bInterfaceClass == USB_CLASS_COMM
1207 && desc->bInterfaceSubClass == 2
1208 && desc->bInterfaceProtocol == 0xff) {
1209 c = udev->config[1].desc.bConfigurationValue;
1210 continue;
1211 }
1212 c = udev->config[i].desc.bConfigurationValue;
1213 break;
1214 }
1215 dev_info(&udev->dev,
1216 "configuration #%d chosen from %d choices\n",
1217 c, udev->descriptor.bNumConfigurations);
1218 }
1219 return c;
1220 }
1221
1222 #ifdef DEBUG
1223 static void show_string(struct usb_device *udev, char *id, char *string)
1224 {
1225 if (!string)
1226 return;
1227 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1228 }
1229
1230 #else
1231 static inline void show_string(struct usb_device *udev, char *id, char *string)
1232 {}
1233 #endif
1234
1235
1236 #ifdef CONFIG_USB_OTG
1237 #include "otg_whitelist.h"
1238 #endif
1239
1240 /**
1241 * usb_new_device - perform initial device setup (usbcore-internal)
1242 * @udev: newly addressed device (in ADDRESS state)
1243 *
1244 * This is called with devices which have been enumerated, but not yet
1245 * configured. The device descriptor is available, but not descriptors
1246 * for any device configuration. The caller must have locked udev and
1247 * either the parent hub (if udev is a normal device) or else the
1248 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1249 * udev has already been installed, but udev is not yet visible through
1250 * sysfs or other filesystem code.
1251 *
1252 * Returns 0 for success (device is configured and listed, with its
1253 * interfaces, in sysfs); else a negative errno value.
1254 *
1255 * This call is synchronous, and may not be used in an interrupt context.
1256 *
1257 * Only the hub driver should ever call this; root hub registration
1258 * uses it indirectly.
1259 */
1260 int usb_new_device(struct usb_device *udev)
1261 {
1262 int err;
1263 int c;
1264
1265 err = usb_get_configuration(udev);
1266 if (err < 0) {
1267 dev_err(&udev->dev, "can't read configurations, error %d\n",
1268 err);
1269 goto fail;
1270 }
1271
1272 /* read the standard strings and cache them if present */
1273 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1274 udev->manufacturer = usb_cache_string(udev,
1275 udev->descriptor.iManufacturer);
1276 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1277
1278 /* Tell the world! */
1279 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1280 "SerialNumber=%d\n",
1281 udev->descriptor.iManufacturer,
1282 udev->descriptor.iProduct,
1283 udev->descriptor.iSerialNumber);
1284 show_string(udev, "Product", udev->product);
1285 show_string(udev, "Manufacturer", udev->manufacturer);
1286 show_string(udev, "SerialNumber", udev->serial);
1287
1288 #ifdef CONFIG_USB_OTG
1289 /*
1290 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1291 * to wake us after we've powered off VBUS; and HNP, switching roles
1292 * "host" to "peripheral". The OTG descriptor helps figure this out.
1293 */
1294 if (!udev->bus->is_b_host
1295 && udev->config
1296 && udev->parent == udev->bus->root_hub) {
1297 struct usb_otg_descriptor *desc = 0;
1298 struct usb_bus *bus = udev->bus;
1299
1300 /* descriptor may appear anywhere in config */
1301 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1302 le16_to_cpu(udev->config[0].desc.wTotalLength),
1303 USB_DT_OTG, (void **) &desc) == 0) {
1304 if (desc->bmAttributes & USB_OTG_HNP) {
1305 unsigned port1;
1306 struct usb_device *root = udev->parent;
1307
1308 for (port1 = 1; port1 <= root->maxchild;
1309 port1++) {
1310 if (root->children[port1-1] == udev)
1311 break;
1312 }
1313
1314 dev_info(&udev->dev,
1315 "Dual-Role OTG device on %sHNP port\n",
1316 (port1 == bus->otg_port)
1317 ? "" : "non-");
1318
1319 /* enable HNP before suspend, it's simpler */
1320 if (port1 == bus->otg_port)
1321 bus->b_hnp_enable = 1;
1322 err = usb_control_msg(udev,
1323 usb_sndctrlpipe(udev, 0),
1324 USB_REQ_SET_FEATURE, 0,
1325 bus->b_hnp_enable
1326 ? USB_DEVICE_B_HNP_ENABLE
1327 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1328 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1329 if (err < 0) {
1330 /* OTG MESSAGE: report errors here,
1331 * customize to match your product.
1332 */
1333 dev_info(&udev->dev,
1334 "can't set HNP mode; %d\n",
1335 err);
1336 bus->b_hnp_enable = 0;
1337 }
1338 }
1339 }
1340 }
1341
1342 if (!is_targeted(udev)) {
1343
1344 /* Maybe it can talk to us, though we can't talk to it.
1345 * (Includes HNP test device.)
1346 */
1347 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1348 static int __usb_suspend_device(struct usb_device *,
1349 int port1);
1350 err = __usb_suspend_device(udev, udev->bus->otg_port);
1351 if (err < 0)
1352 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1353 }
1354 err = -ENODEV;
1355 goto fail;
1356 }
1357 #endif
1358
1359 /* put device-specific files into sysfs */
1360 err = device_add (&udev->dev);
1361 if (err) {
1362 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1363 goto fail;
1364 }
1365 usb_create_sysfs_dev_files (udev);
1366
1367 /* choose and set the configuration. that registers the interfaces
1368 * with the driver core, and lets usb device drivers bind to them.
1369 */
1370 c = choose_configuration(udev);
1371 if (c < 0)
1372 dev_warn(&udev->dev,
1373 "can't choose an initial configuration\n");
1374 else {
1375 err = usb_set_configuration(udev, c);
1376 if (err) {
1377 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1378 c, err);
1379 usb_remove_sysfs_dev_files(udev);
1380 device_del(&udev->dev);
1381 goto fail;
1382 }
1383 }
1384
1385 /* USB device state == configured ... usable */
1386 usb_notify_add_device(udev);
1387
1388 return 0;
1389
1390 fail:
1391 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1392 return err;
1393 }
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 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1402 if (ret < 0)
1403 dev_err (hub->intfdev,
1404 "%s failed (err = %d)\n", __FUNCTION__, ret);
1405 else {
1406 *status = le16_to_cpu(hub->status->port.wPortStatus);
1407 *change = le16_to_cpu(hub->status->port.wPortChange);
1408 ret = 0;
1409 }
1410 return ret;
1411 }
1412
1413 #define PORT_RESET_TRIES 5
1414 #define SET_ADDRESS_TRIES 2
1415 #define GET_DESCRIPTOR_TRIES 2
1416 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1417 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1418
1419 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1420 #define HUB_SHORT_RESET_TIME 10
1421 #define HUB_LONG_RESET_TIME 200
1422 #define HUB_RESET_TIMEOUT 500
1423
1424 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1425 struct usb_device *udev, unsigned int delay)
1426 {
1427 int delay_time, ret;
1428 u16 portstatus;
1429 u16 portchange;
1430
1431 for (delay_time = 0;
1432 delay_time < HUB_RESET_TIMEOUT;
1433 delay_time += delay) {
1434 /* wait to give the device a chance to reset */
1435 msleep(delay);
1436
1437 /* read and decode port status */
1438 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1439 if (ret < 0)
1440 return ret;
1441
1442 /* Device went away? */
1443 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1444 return -ENOTCONN;
1445
1446 /* bomb out completely if something weird happened */
1447 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1448 return -EINVAL;
1449
1450 /* if we`ve finished resetting, then break out of the loop */
1451 if (!(portstatus & USB_PORT_STAT_RESET) &&
1452 (portstatus & USB_PORT_STAT_ENABLE)) {
1453 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1454 udev->speed = USB_SPEED_HIGH;
1455 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1456 udev->speed = USB_SPEED_LOW;
1457 else
1458 udev->speed = USB_SPEED_FULL;
1459 return 0;
1460 }
1461
1462 /* switch to the long delay after two short delay failures */
1463 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1464 delay = HUB_LONG_RESET_TIME;
1465
1466 dev_dbg (hub->intfdev,
1467 "port %d not reset yet, waiting %dms\n",
1468 port1, delay);
1469 }
1470
1471 return -EBUSY;
1472 }
1473
1474 static int hub_port_reset(struct usb_hub *hub, int port1,
1475 struct usb_device *udev, unsigned int delay)
1476 {
1477 int i, status;
1478
1479 /* Reset the port */
1480 for (i = 0; i < PORT_RESET_TRIES; i++) {
1481 status = set_port_feature(hub->hdev,
1482 port1, USB_PORT_FEAT_RESET);
1483 if (status)
1484 dev_err(hub->intfdev,
1485 "cannot reset port %d (err = %d)\n",
1486 port1, status);
1487 else {
1488 status = hub_port_wait_reset(hub, port1, udev, delay);
1489 if (status && status != -ENOTCONN)
1490 dev_dbg(hub->intfdev,
1491 "port_wait_reset: err = %d\n",
1492 status);
1493 }
1494
1495 /* return on disconnect or reset */
1496 switch (status) {
1497 case 0:
1498 /* TRSTRCY = 10 ms; plus some extra */
1499 msleep(10 + 40);
1500 /* FALL THROUGH */
1501 case -ENOTCONN:
1502 case -ENODEV:
1503 clear_port_feature(hub->hdev,
1504 port1, USB_PORT_FEAT_C_RESET);
1505 /* FIXME need disconnect() for NOTATTACHED device */
1506 usb_set_device_state(udev, status
1507 ? USB_STATE_NOTATTACHED
1508 : USB_STATE_DEFAULT);
1509 return status;
1510 }
1511
1512 dev_dbg (hub->intfdev,
1513 "port %d not enabled, trying reset again...\n",
1514 port1);
1515 delay = HUB_LONG_RESET_TIME;
1516 }
1517
1518 dev_err (hub->intfdev,
1519 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1520 port1);
1521
1522 return status;
1523 }
1524
1525 /*
1526 * Disable a port and mark a logical connnect-change event, so that some
1527 * time later khubd will disconnect() any existing usb_device on the port
1528 * and will re-enumerate if there actually is a device attached.
1529 */
1530 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1531 {
1532 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1533 hub_port_disable(hub, port1, 1);
1534
1535 /* FIXME let caller ask to power down the port:
1536 * - some devices won't enumerate without a VBUS power cycle
1537 * - SRP saves power that way
1538 * - ... new call, TBD ...
1539 * That's easy if this hub can switch power per-port, and
1540 * khubd reactivates the port later (timer, SRP, etc).
1541 * Powerdown must be optional, because of reset/DFU.
1542 */
1543
1544 set_bit(port1, hub->change_bits);
1545 kick_khubd(hub);
1546 }
1547
1548
1549 #ifdef CONFIG_USB_SUSPEND
1550
1551 /*
1552 * Selective port suspend reduces power; most suspended devices draw
1553 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1554 * All devices below the suspended port are also suspended.
1555 *
1556 * Devices leave suspend state when the host wakes them up. Some devices
1557 * also support "remote wakeup", where the device can activate the USB
1558 * tree above them to deliver data, such as a keypress or packet. In
1559 * some cases, this wakes the USB host.
1560 */
1561 static int hub_port_suspend(struct usb_hub *hub, int port1,
1562 struct usb_device *udev)
1563 {
1564 int status;
1565
1566 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1567
1568 /* enable remote wakeup when appropriate; this lets the device
1569 * wake up the upstream hub (including maybe the root hub).
1570 *
1571 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1572 * we don't explicitly enable it here.
1573 */
1574 if (device_may_wakeup(&udev->dev)) {
1575 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1576 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1577 USB_DEVICE_REMOTE_WAKEUP, 0,
1578 NULL, 0,
1579 USB_CTRL_SET_TIMEOUT);
1580 if (status)
1581 dev_dbg(&udev->dev,
1582 "won't remote wakeup, status %d\n",
1583 status);
1584 }
1585
1586 /* see 7.1.7.6 */
1587 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1588 if (status) {
1589 dev_dbg(hub->intfdev,
1590 "can't suspend port %d, status %d\n",
1591 port1, status);
1592 /* paranoia: "should not happen" */
1593 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1594 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1595 USB_DEVICE_REMOTE_WAKEUP, 0,
1596 NULL, 0,
1597 USB_CTRL_SET_TIMEOUT);
1598 } else {
1599 /* device has up to 10 msec to fully suspend */
1600 dev_dbg(&udev->dev, "usb suspend\n");
1601 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1602 msleep(10);
1603 }
1604 return status;
1605 }
1606
1607 /*
1608 * Devices on USB hub ports have only one "suspend" state, corresponding
1609 * to ACPI D2, "may cause the device to lose some context".
1610 * State transitions include:
1611 *
1612 * - suspend, resume ... when the VBUS power link stays live
1613 * - suspend, disconnect ... VBUS lost
1614 *
1615 * Once VBUS drop breaks the circuit, the port it's using has to go through
1616 * normal re-enumeration procedures, starting with enabling VBUS power.
1617 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1618 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1619 * timer, no SRP, no requests through sysfs.
1620 *
1621 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1622 * the root hub for their bus goes into global suspend ... so we don't
1623 * (falsely) update the device power state to say it suspended.
1624 */
1625 static int __usb_suspend_device (struct usb_device *udev, int port1)
1626 {
1627 int status = 0;
1628
1629 /* caller owns the udev device lock */
1630 if (port1 < 0)
1631 return port1;
1632
1633 if (udev->state == USB_STATE_SUSPENDED
1634 || udev->state == USB_STATE_NOTATTACHED) {
1635 return 0;
1636 }
1637
1638 /* all interfaces must already be suspended */
1639 if (udev->actconfig) {
1640 int i;
1641
1642 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1643 struct usb_interface *intf;
1644
1645 intf = udev->actconfig->interface[i];
1646 if (is_active(intf)) {
1647 dev_dbg(&intf->dev, "nyet suspended\n");
1648 return -EBUSY;
1649 }
1650 }
1651 }
1652
1653 /* we only change a device's upstream USB link.
1654 * 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
1660 if (status == 0)
1661 udev->dev.power.power_state = PMSG_SUSPEND;
1662 return status;
1663 }
1664
1665 #endif
1666
1667 /*
1668 * usb_suspend_device - suspend a usb device
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_resume_device(). 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_suspend_device(struct usb_device *udev)
1688 {
1689 #ifdef CONFIG_USB_SUSPEND
1690 int port1, status;
1691
1692 port1 = locktree(udev);
1693 if (port1 < 0)
1694 return port1;
1695
1696 status = __usb_suspend_device(udev, port1);
1697 usb_unlock_device(udev);
1698 return status;
1699 #else
1700 /* NOTE: udev->state unchanged, it's not lying ... */
1701 udev->dev.power.power_state = PMSG_SUSPEND;
1702 return 0;
1703 #endif
1704 }
1705
1706 /*
1707 * If the USB "suspend" state is in use (rather than "global suspend"),
1708 * many devices will be individually taken out of suspend state using
1709 * special" resume" signaling. These routines kick in shortly after
1710 * hardware resume signaling is finished, either because of selective
1711 * resume (by host) or remote wakeup (by device) ... now see what changed
1712 * in the tree that's rooted at this device.
1713 */
1714 static int finish_device_resume(struct usb_device *udev)
1715 {
1716 int status;
1717 u16 devstatus;
1718
1719 /* caller owns the udev device lock */
1720 dev_dbg(&udev->dev, "finish resume\n");
1721
1722 /* usb ch9 identifies four variants of SUSPENDED, based on what
1723 * state the device resumes to. Linux currently won't see the
1724 * first two on the host side; they'd be inside hub_port_init()
1725 * during many timeouts, but khubd can't suspend until later.
1726 */
1727 usb_set_device_state(udev, udev->actconfig
1728 ? USB_STATE_CONFIGURED
1729 : USB_STATE_ADDRESS);
1730
1731 /* 10.5.4.5 says be sure devices in the tree are still there.
1732 * For now let's assume the device didn't go crazy on resume,
1733 * and device drivers will know about any resume quirks.
1734 */
1735 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1736 if (status < 0)
1737 dev_dbg(&udev->dev,
1738 "gone after usb resume? status %d\n",
1739 status);
1740 else if (udev->actconfig) {
1741 unsigned i;
1742 int (*resume)(struct device *);
1743
1744 le16_to_cpus(&devstatus);
1745 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
1746 && udev->parent) {
1747 status = usb_control_msg(udev,
1748 usb_sndctrlpipe(udev, 0),
1749 USB_REQ_CLEAR_FEATURE,
1750 USB_RECIP_DEVICE,
1751 USB_DEVICE_REMOTE_WAKEUP, 0,
1752 NULL, 0,
1753 USB_CTRL_SET_TIMEOUT);
1754 if (status) {
1755 dev_dbg(&udev->dev, "disable remote "
1756 "wakeup, status %d\n", status);
1757 status = 0;
1758 }
1759 }
1760
1761 /* resume interface drivers; if this is a hub, it
1762 * may have a child resume event to deal with soon
1763 */
1764 resume = udev->dev.bus->resume;
1765 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++)
1766 (void) resume(&udev->actconfig->interface[i]->dev);
1767 status = 0;
1768
1769 } else if (udev->devnum <= 0) {
1770 dev_dbg(&udev->dev, "bogus resume!\n");
1771 status = -EINVAL;
1772 }
1773 return status;
1774 }
1775
1776 #ifdef CONFIG_USB_SUSPEND
1777
1778 static int
1779 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1780 {
1781 int status;
1782
1783 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1784
1785 /* see 7.1.7.7; affects power usage, but not budgeting */
1786 status = clear_port_feature(hub->hdev,
1787 port1, USB_PORT_FEAT_SUSPEND);
1788 if (status) {
1789 dev_dbg(hub->intfdev,
1790 "can't resume port %d, status %d\n",
1791 port1, status);
1792 } else {
1793 u16 devstatus;
1794 u16 portchange;
1795
1796 /* drive resume for at least 20 msec */
1797 if (udev)
1798 dev_dbg(&udev->dev, "RESUME\n");
1799 msleep(25);
1800
1801 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1802 | USB_PORT_STAT_ENABLE \
1803 | USB_PORT_STAT_CONNECTION)
1804
1805 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1806 * stop resume signaling. Then finish the resume
1807 * sequence.
1808 */
1809 devstatus = portchange = 0;
1810 status = hub_port_status(hub, port1,
1811 &devstatus, &portchange);
1812 if (status < 0
1813 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1814 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1815 ) {
1816 dev_dbg(hub->intfdev,
1817 "port %d status %04x.%04x after resume, %d\n",
1818 port1, portchange, devstatus, status);
1819 } else {
1820 /* TRSMRCY = 10 msec */
1821 msleep(10);
1822 if (udev)
1823 status = finish_device_resume(udev);
1824 }
1825 }
1826 if (status < 0)
1827 hub_port_logical_disconnect(hub, port1);
1828
1829 return status;
1830 }
1831
1832 #endif
1833
1834 /*
1835 * usb_resume_device - re-activate a suspended usb device
1836 * @udev: device to re-activate
1837 * Context: must be able to sleep; device not locked; pm locks held
1838 *
1839 * This will re-activate the suspended device, increasing power usage
1840 * while letting drivers communicate again with its endpoints.
1841 * USB resume explicitly guarantees that the power session between
1842 * the host and the device is the same as it was when the device
1843 * suspended.
1844 *
1845 * Returns 0 on success, else negative errno.
1846 */
1847 int usb_resume_device(struct usb_device *udev)
1848 {
1849 int port1, status;
1850
1851 port1 = locktree(udev);
1852 if (port1 < 0)
1853 return port1;
1854
1855 #ifdef CONFIG_USB_SUSPEND
1856 /* selective resume of one downstream hub-to-device port */
1857 if (udev->parent) {
1858 if (udev->state == USB_STATE_SUSPENDED) {
1859 // NOTE swsusp may bork us, device state being wrong...
1860 // NOTE this fails if parent is also suspended...
1861 status = hub_port_resume(hdev_to_hub(udev->parent),
1862 port1, udev);
1863 } else
1864 status = 0;
1865 } else
1866 #endif
1867 status = finish_device_resume(udev);
1868 if (status < 0)
1869 dev_dbg(&udev->dev, "can't resume, status %d\n",
1870 status);
1871
1872 usb_unlock_device(udev);
1873
1874 /* rebind drivers that had no suspend() */
1875 if (status == 0) {
1876 usb_lock_all_devices();
1877 bus_rescan_devices(&usb_bus_type);
1878 usb_unlock_all_devices();
1879 }
1880 return status;
1881 }
1882
1883 static int remote_wakeup(struct usb_device *udev)
1884 {
1885 int status = 0;
1886
1887 #ifdef CONFIG_USB_SUSPEND
1888
1889 /* don't repeat RESUME sequence if this device
1890 * was already woken up by some other task
1891 */
1892 down(&udev->serialize);
1893 if (udev->state == USB_STATE_SUSPENDED) {
1894 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1895 /* TRSMRCY = 10 msec */
1896 msleep(10);
1897 status = finish_device_resume(udev);
1898 }
1899 up(&udev->serialize);
1900 #endif
1901 return status;
1902 }
1903
1904 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1905 {
1906 struct usb_hub *hub = usb_get_intfdata (intf);
1907 struct usb_device *hdev = hub->hdev;
1908 unsigned port1;
1909
1910 /* fail if children aren't already suspended */
1911 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1912 struct usb_device *udev;
1913
1914 udev = hdev->children [port1-1];
1915 if (udev && (udev->dev.power.power_state.event
1916 == PM_EVENT_ON
1917 #ifdef CONFIG_USB_SUSPEND
1918 || udev->state != USB_STATE_SUSPENDED
1919 #endif
1920 )) {
1921 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1922 return -EBUSY;
1923 }
1924 }
1925
1926 /* "global suspend" of the downstream HC-to-USB interface */
1927 if (!hdev->parent) {
1928 struct usb_bus *bus = hdev->bus;
1929 if (bus) {
1930 int status = hcd_bus_suspend (bus);
1931
1932 if (status != 0) {
1933 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1934 status);
1935 return status;
1936 }
1937 } else
1938 return -EOPNOTSUPP;
1939 }
1940
1941 /* stop khubd and related activity */
1942 hub_quiesce(hub);
1943 return 0;
1944 }
1945
1946 static int hub_resume(struct usb_interface *intf)
1947 {
1948 struct usb_device *hdev = interface_to_usbdev(intf);
1949 struct usb_hub *hub = usb_get_intfdata (intf);
1950 int status;
1951
1952 /* "global resume" of the downstream HC-to-USB interface */
1953 if (!hdev->parent) {
1954 struct usb_bus *bus = hdev->bus;
1955 if (bus) {
1956 status = hcd_bus_resume (bus);
1957 if (status) {
1958 dev_dbg(&intf->dev, "'global' resume %d\n",
1959 status);
1960 return status;
1961 }
1962 } else
1963 return -EOPNOTSUPP;
1964 if (status == 0) {
1965 /* TRSMRCY = 10 msec */
1966 msleep(10);
1967 }
1968 }
1969
1970 hub_activate(hub);
1971
1972 /* REVISIT: this recursion probably shouldn't exist. Remove
1973 * this code sometime, after retesting with different root and
1974 * external hubs.
1975 */
1976 #ifdef CONFIG_USB_SUSPEND
1977 {
1978 unsigned port1;
1979
1980 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1981 struct usb_device *udev;
1982 u16 portstat, portchange;
1983
1984 udev = hdev->children [port1-1];
1985 status = hub_port_status(hub, port1, &portstat, &portchange);
1986 if (status == 0) {
1987 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1988 clear_port_feature(hdev, port1,
1989 USB_PORT_FEAT_C_SUSPEND);
1990 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1991 }
1992
1993 /* let khubd handle disconnects etc */
1994 if (portchange)
1995 continue;
1996 }
1997
1998 if (!udev || status < 0)
1999 continue;
2000 down (&udev->serialize);
2001 if (portstat & USB_PORT_STAT_SUSPEND)
2002 status = hub_port_resume(hub, port1, udev);
2003 else {
2004 status = finish_device_resume(udev);
2005 if (status < 0) {
2006 dev_dbg(&intf->dev, "resume port %d --> %d\n",
2007 port1, status);
2008 hub_port_logical_disconnect(hub, port1);
2009 }
2010 }
2011 up(&udev->serialize);
2012 }
2013 }
2014 #endif
2015 return 0;
2016 }
2017
2018 void usb_suspend_root_hub(struct usb_device *hdev)
2019 {
2020 struct usb_hub *hub = hdev_to_hub(hdev);
2021
2022 /* This also makes any led blinker stop retriggering. We're called
2023 * from irq, so the blinker might still be scheduled. Caller promises
2024 * that the root hub status URB will be canceled.
2025 */
2026 __hub_quiesce(hub);
2027 mark_quiesced(to_usb_interface(hub->intfdev));
2028 }
2029
2030 void usb_resume_root_hub(struct usb_device *hdev)
2031 {
2032 struct usb_hub *hub = hdev_to_hub(hdev);
2033
2034 hub->resume_root_hub = 1;
2035 kick_khubd(hub);
2036 }
2037
2038
2039 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2040 *
2041 * Between connect detection and reset signaling there must be a delay
2042 * of 100ms at least for debounce and power-settling. The corresponding
2043 * timer shall restart whenever the downstream port detects a disconnect.
2044 *
2045 * Apparently there are some bluetooth and irda-dongles and a number of
2046 * low-speed devices for which this debounce period may last over a second.
2047 * Not covered by the spec - but easy to deal with.
2048 *
2049 * This implementation uses a 1500ms total debounce timeout; if the
2050 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2051 * every 25ms for transient disconnects. When the port status has been
2052 * unchanged for 100ms it returns the port status.
2053 */
2054
2055 #define HUB_DEBOUNCE_TIMEOUT 1500
2056 #define HUB_DEBOUNCE_STEP 25
2057 #define HUB_DEBOUNCE_STABLE 100
2058
2059 static int hub_port_debounce(struct usb_hub *hub, int port1)
2060 {
2061 int ret;
2062 int total_time, stable_time = 0;
2063 u16 portchange, portstatus;
2064 unsigned connection = 0xffff;
2065
2066 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2067 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2068 if (ret < 0)
2069 return ret;
2070
2071 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2072 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2073 stable_time += HUB_DEBOUNCE_STEP;
2074 if (stable_time >= HUB_DEBOUNCE_STABLE)
2075 break;
2076 } else {
2077 stable_time = 0;
2078 connection = portstatus & USB_PORT_STAT_CONNECTION;
2079 }
2080
2081 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2082 clear_port_feature(hub->hdev, port1,
2083 USB_PORT_FEAT_C_CONNECTION);
2084 }
2085
2086 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2087 break;
2088 msleep(HUB_DEBOUNCE_STEP);
2089 }
2090
2091 dev_dbg (hub->intfdev,
2092 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2093 port1, total_time, stable_time, portstatus);
2094
2095 if (stable_time < HUB_DEBOUNCE_STABLE)
2096 return -ETIMEDOUT;
2097 return portstatus;
2098 }
2099
2100 static void ep0_reinit(struct usb_device *udev)
2101 {
2102 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2103 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2104 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2105 }
2106
2107 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2108 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2109
2110 static int hub_set_address(struct usb_device *udev)
2111 {
2112 int retval;
2113
2114 if (udev->devnum == 0)
2115 return -EINVAL;
2116 if (udev->state == USB_STATE_ADDRESS)
2117 return 0;
2118 if (udev->state != USB_STATE_DEFAULT)
2119 return -EINVAL;
2120 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2121 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2122 NULL, 0, USB_CTRL_SET_TIMEOUT);
2123 if (retval == 0) {
2124 usb_set_device_state(udev, USB_STATE_ADDRESS);
2125 ep0_reinit(udev);
2126 }
2127 return retval;
2128 }
2129
2130 /* Reset device, (re)assign address, get device descriptor.
2131 * Device connection must be stable, no more debouncing needed.
2132 * Returns device in USB_STATE_ADDRESS, except on error.
2133 *
2134 * If this is called for an already-existing device (as part of
2135 * usb_reset_device), the caller must own the device lock. For a
2136 * newly detected device that is not accessible through any global
2137 * pointers, it's not necessary to lock the device.
2138 */
2139 static int
2140 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2141 int retry_counter)
2142 {
2143 static DECLARE_MUTEX(usb_address0_sem);
2144
2145 struct usb_device *hdev = hub->hdev;
2146 int i, j, retval;
2147 unsigned delay = HUB_SHORT_RESET_TIME;
2148 enum usb_device_speed oldspeed = udev->speed;
2149
2150 /* root hub ports have a slightly longer reset period
2151 * (from USB 2.0 spec, section 7.1.7.5)
2152 */
2153 if (!hdev->parent) {
2154 delay = HUB_ROOT_RESET_TIME;
2155 if (port1 == hdev->bus->otg_port)
2156 hdev->bus->b_hnp_enable = 0;
2157 }
2158
2159 /* Some low speed devices have problems with the quick delay, so */
2160 /* be a bit pessimistic with those devices. RHbug #23670 */
2161 if (oldspeed == USB_SPEED_LOW)
2162 delay = HUB_LONG_RESET_TIME;
2163
2164 down(&usb_address0_sem);
2165
2166 /* Reset the device; full speed may morph to high speed */
2167 retval = hub_port_reset(hub, port1, udev, delay);
2168 if (retval < 0) /* error or disconnect */
2169 goto fail;
2170 /* success, speed is known */
2171 retval = -ENODEV;
2172
2173 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2174 dev_dbg(&udev->dev, "device reset changed speed!\n");
2175 goto fail;
2176 }
2177 oldspeed = udev->speed;
2178
2179 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2180 * it's fixed size except for full speed devices.
2181 */
2182 switch (udev->speed) {
2183 case USB_SPEED_HIGH: /* fixed at 64 */
2184 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2185 break;
2186 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2187 /* to determine the ep0 maxpacket size, try to read
2188 * the device descriptor to get bMaxPacketSize0 and
2189 * then correct our initial guess.
2190 */
2191 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2192 break;
2193 case USB_SPEED_LOW: /* fixed at 8 */
2194 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2195 break;
2196 default:
2197 goto fail;
2198 }
2199
2200 dev_info (&udev->dev,
2201 "%s %s speed USB device using %s and address %d\n",
2202 (udev->config) ? "reset" : "new",
2203 ({ char *speed; switch (udev->speed) {
2204 case USB_SPEED_LOW: speed = "low"; break;
2205 case USB_SPEED_FULL: speed = "full"; break;
2206 case USB_SPEED_HIGH: speed = "high"; break;
2207 default: speed = "?"; break;
2208 }; speed;}),
2209 udev->bus->controller->driver->name,
2210 udev->devnum);
2211
2212 /* Set up TT records, if needed */
2213 if (hdev->tt) {
2214 udev->tt = hdev->tt;
2215 udev->ttport = hdev->ttport;
2216 } else if (udev->speed != USB_SPEED_HIGH
2217 && hdev->speed == USB_SPEED_HIGH) {
2218 udev->tt = &hub->tt;
2219 udev->ttport = port1;
2220 }
2221
2222 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2223 * Because device hardware and firmware is sometimes buggy in
2224 * this area, and this is how Linux has done it for ages.
2225 * Change it cautiously.
2226 *
2227 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2228 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2229 * so it may help with some non-standards-compliant devices.
2230 * Otherwise we start with SET_ADDRESS and then try to read the
2231 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2232 * value.
2233 */
2234 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2235 if (USE_NEW_SCHEME(retry_counter)) {
2236 struct usb_device_descriptor *buf;
2237 int r = 0;
2238
2239 #define GET_DESCRIPTOR_BUFSIZE 64
2240 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2241 if (!buf) {
2242 retval = -ENOMEM;
2243 continue;
2244 }
2245
2246 /* Use a short timeout the first time through,
2247 * so that recalcitrant full-speed devices with
2248 * 8- or 16-byte ep0-maxpackets won't slow things
2249 * down tremendously by NAKing the unexpectedly
2250 * early status stage. Also, retry on all errors;
2251 * some devices are flakey.
2252 */
2253 for (j = 0; j < 3; ++j) {
2254 buf->bMaxPacketSize0 = 0;
2255 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2256 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2257 USB_DT_DEVICE << 8, 0,
2258 buf, GET_DESCRIPTOR_BUFSIZE,
2259 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2260 switch (buf->bMaxPacketSize0) {
2261 case 8: case 16: case 32: case 64:
2262 if (buf->bDescriptorType ==
2263 USB_DT_DEVICE) {
2264 r = 0;
2265 break;
2266 }
2267 /* FALL THROUGH */
2268 default:
2269 if (r == 0)
2270 r = -EPROTO;
2271 break;
2272 }
2273 if (r == 0)
2274 break;
2275 }
2276 udev->descriptor.bMaxPacketSize0 =
2277 buf->bMaxPacketSize0;
2278 kfree(buf);
2279
2280 retval = hub_port_reset(hub, port1, udev, delay);
2281 if (retval < 0) /* error or disconnect */
2282 goto fail;
2283 if (oldspeed != udev->speed) {
2284 dev_dbg(&udev->dev,
2285 "device reset changed speed!\n");
2286 retval = -ENODEV;
2287 goto fail;
2288 }
2289 if (r) {
2290 dev_err(&udev->dev, "device descriptor "
2291 "read/%s, error %d\n",
2292 "64", r);
2293 retval = -EMSGSIZE;
2294 continue;
2295 }
2296 #undef GET_DESCRIPTOR_BUFSIZE
2297 }
2298
2299 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2300 retval = hub_set_address(udev);
2301 if (retval >= 0)
2302 break;
2303 msleep(200);
2304 }
2305 if (retval < 0) {
2306 dev_err(&udev->dev,
2307 "device not accepting address %d, error %d\n",
2308 udev->devnum, retval);
2309 goto fail;
2310 }
2311
2312 /* cope with hardware quirkiness:
2313 * - let SET_ADDRESS settle, some device hardware wants it
2314 * - read ep0 maxpacket even for high and low speed,
2315 */
2316 msleep(10);
2317 if (USE_NEW_SCHEME(retry_counter))
2318 break;
2319
2320 retval = usb_get_device_descriptor(udev, 8);
2321 if (retval < 8) {
2322 dev_err(&udev->dev, "device descriptor "
2323 "read/%s, error %d\n",
2324 "8", retval);
2325 if (retval >= 0)
2326 retval = -EMSGSIZE;
2327 } else {
2328 retval = 0;
2329 break;
2330 }
2331 }
2332 if (retval)
2333 goto fail;
2334
2335 i = udev->descriptor.bMaxPacketSize0;
2336 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2337 if (udev->speed != USB_SPEED_FULL ||
2338 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2339 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2340 retval = -EMSGSIZE;
2341 goto fail;
2342 }
2343 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2344 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2345 ep0_reinit(udev);
2346 }
2347
2348 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2349 if (retval < (signed)sizeof(udev->descriptor)) {
2350 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2351 "all", retval);
2352 if (retval >= 0)
2353 retval = -ENOMSG;
2354 goto fail;
2355 }
2356
2357 retval = 0;
2358
2359 fail:
2360 if (retval)
2361 hub_port_disable(hub, port1, 0);
2362 up(&usb_address0_sem);
2363 return retval;
2364 }
2365
2366 static void
2367 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2368 {
2369 struct usb_qualifier_descriptor *qual;
2370 int status;
2371
2372 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2373 if (qual == NULL)
2374 return;
2375
2376 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2377 qual, sizeof *qual);
2378 if (status == sizeof *qual) {
2379 dev_info(&udev->dev, "not running at top speed; "
2380 "connect to a high speed hub\n");
2381 /* hub LEDs are probably harder to miss than syslog */
2382 if (hub->has_indicators) {
2383 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2384 schedule_work (&hub->leds);
2385 }
2386 }
2387 kfree(qual);
2388 }
2389
2390 static unsigned
2391 hub_power_remaining (struct usb_hub *hub)
2392 {
2393 struct usb_device *hdev = hub->hdev;
2394 int remaining;
2395 unsigned i;
2396
2397 remaining = hub->power_budget;
2398 if (!remaining) /* self-powered */
2399 return 0;
2400
2401 for (i = 0; i < hdev->maxchild; i++) {
2402 struct usb_device *udev = hdev->children[i];
2403 int delta, ceiling;
2404
2405 if (!udev)
2406 continue;
2407
2408 /* 100mA per-port ceiling, or 8mA for OTG ports */
2409 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2410 ceiling = 50;
2411 else
2412 ceiling = 4;
2413
2414 if (udev->actconfig)
2415 delta = udev->actconfig->desc.bMaxPower;
2416 else
2417 delta = ceiling;
2418 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2419 if (delta > ceiling)
2420 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2421 2 * (delta - ceiling), 2 * ceiling);
2422 remaining -= delta;
2423 }
2424 if (remaining < 0) {
2425 dev_warn(hub->intfdev,
2426 "%dmA over power budget!\n",
2427 -2 * remaining);
2428 remaining = 0;
2429 }
2430 return remaining;
2431 }
2432
2433 /* Handle physical or logical connection change events.
2434 * This routine is called when:
2435 * a port connection-change occurs;
2436 * a port enable-change occurs (often caused by EMI);
2437 * usb_reset_device() encounters changed descriptors (as from
2438 * a firmware download)
2439 * caller already locked the hub
2440 */
2441 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2442 u16 portstatus, u16 portchange)
2443 {
2444 struct usb_device *hdev = hub->hdev;
2445 struct device *hub_dev = hub->intfdev;
2446 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2447 int status, i;
2448
2449 dev_dbg (hub_dev,
2450 "port %d, status %04x, change %04x, %s\n",
2451 port1, portstatus, portchange, portspeed (portstatus));
2452
2453 if (hub->has_indicators) {
2454 set_port_led(hub, port1, HUB_LED_AUTO);
2455 hub->indicator[port1-1] = INDICATOR_AUTO;
2456 }
2457
2458 /* Disconnect any existing devices under this port */
2459 if (hdev->children[port1-1])
2460 usb_disconnect(&hdev->children[port1-1]);
2461 clear_bit(port1, hub->change_bits);
2462
2463 #ifdef CONFIG_USB_OTG
2464 /* during HNP, don't repeat the debounce */
2465 if (hdev->bus->is_b_host)
2466 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2467 #endif
2468
2469 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2470 status = hub_port_debounce(hub, port1);
2471 if (status < 0) {
2472 dev_err (hub_dev,
2473 "connect-debounce failed, port %d disabled\n",
2474 port1);
2475 goto done;
2476 }
2477 portstatus = status;
2478 }
2479
2480 /* Return now if nothing is connected */
2481 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2482
2483 /* maybe switch power back on (e.g. root hub was reset) */
2484 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2485 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2486 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2487
2488 if (portstatus & USB_PORT_STAT_ENABLE)
2489 goto done;
2490 return;
2491 }
2492
2493 #ifdef CONFIG_USB_SUSPEND
2494 /* If something is connected, but the port is suspended, wake it up. */
2495 if (portstatus & USB_PORT_STAT_SUSPEND) {
2496 status = hub_port_resume(hub, port1, NULL);
2497 if (status < 0) {
2498 dev_dbg(hub_dev,
2499 "can't clear suspend on port %d; %d\n",
2500 port1, status);
2501 goto done;
2502 }
2503 }
2504 #endif
2505
2506 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2507 struct usb_device *udev;
2508
2509 /* reallocate for each attempt, since references
2510 * to the previous one can escape in various ways
2511 */
2512 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2513 if (!udev) {
2514 dev_err (hub_dev,
2515 "couldn't allocate port %d usb_device\n",
2516 port1);
2517 goto done;
2518 }
2519
2520 usb_set_device_state(udev, USB_STATE_POWERED);
2521 udev->speed = USB_SPEED_UNKNOWN;
2522
2523 /* set the address */
2524 choose_address(udev);
2525 if (udev->devnum <= 0) {
2526 status = -ENOTCONN; /* Don't retry */
2527 goto loop;
2528 }
2529
2530 /* reset and get descriptor */
2531 status = hub_port_init(hub, udev, port1, i);
2532 if (status < 0)
2533 goto loop;
2534
2535 /* consecutive bus-powered hubs aren't reliable; they can
2536 * violate the voltage drop budget. if the new child has
2537 * a "powered" LED, users should notice we didn't enable it
2538 * (without reading syslog), even without per-port LEDs
2539 * on the parent.
2540 */
2541 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2542 && hub->power_budget) {
2543 u16 devstat;
2544
2545 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2546 &devstat);
2547 if (status < 0) {
2548 dev_dbg(&udev->dev, "get status %d ?\n", status);
2549 goto loop_disable;
2550 }
2551 cpu_to_le16s(&devstat);
2552 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2553 dev_err(&udev->dev,
2554 "can't connect bus-powered hub "
2555 "to this port\n");
2556 if (hub->has_indicators) {
2557 hub->indicator[port1-1] =
2558 INDICATOR_AMBER_BLINK;
2559 schedule_work (&hub->leds);
2560 }
2561 status = -ENOTCONN; /* Don't retry */
2562 goto loop_disable;
2563 }
2564 }
2565
2566 /* check for devices running slower than they could */
2567 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2568 && udev->speed == USB_SPEED_FULL
2569 && highspeed_hubs != 0)
2570 check_highspeed (hub, udev, port1);
2571
2572 /* Store the parent's children[] pointer. At this point
2573 * udev becomes globally accessible, although presumably
2574 * no one will look at it until hdev is unlocked.
2575 */
2576 down (&udev->serialize);
2577 status = 0;
2578
2579 /* We mustn't add new devices if the parent hub has
2580 * been disconnected; we would race with the
2581 * recursively_mark_NOTATTACHED() routine.
2582 */
2583 spin_lock_irq(&device_state_lock);
2584 if (hdev->state == USB_STATE_NOTATTACHED)
2585 status = -ENOTCONN;
2586 else
2587 hdev->children[port1-1] = udev;
2588 spin_unlock_irq(&device_state_lock);
2589
2590 /* Run it through the hoops (find a driver, etc) */
2591 if (!status) {
2592 status = usb_new_device(udev);
2593 if (status) {
2594 spin_lock_irq(&device_state_lock);
2595 hdev->children[port1-1] = NULL;
2596 spin_unlock_irq(&device_state_lock);
2597 }
2598 }
2599
2600 up (&udev->serialize);
2601 if (status)
2602 goto loop_disable;
2603
2604 status = hub_power_remaining(hub);
2605 if (status)
2606 dev_dbg(hub_dev,
2607 "%dmA power budget left\n",
2608 2 * status);
2609
2610 return;
2611
2612 loop_disable:
2613 hub_port_disable(hub, port1, 1);
2614 loop:
2615 ep0_reinit(udev);
2616 release_address(udev);
2617 usb_put_dev(udev);
2618 if (status == -ENOTCONN)
2619 break;
2620 }
2621
2622 done:
2623 hub_port_disable(hub, port1, 1);
2624 }
2625
2626 static void hub_events(void)
2627 {
2628 struct list_head *tmp;
2629 struct usb_device *hdev;
2630 struct usb_interface *intf;
2631 struct usb_hub *hub;
2632 struct device *hub_dev;
2633 u16 hubstatus;
2634 u16 hubchange;
2635 u16 portstatus;
2636 u16 portchange;
2637 int i, ret;
2638 int connect_change;
2639
2640 /*
2641 * We restart the list every time to avoid a deadlock with
2642 * deleting hubs downstream from this one. This should be
2643 * safe since we delete the hub from the event list.
2644 * Not the most efficient, but avoids deadlocks.
2645 */
2646 while (1) {
2647
2648 /* Grab the first entry at the beginning of the list */
2649 spin_lock_irq(&hub_event_lock);
2650 if (list_empty(&hub_event_list)) {
2651 spin_unlock_irq(&hub_event_lock);
2652 break;
2653 }
2654
2655 tmp = hub_event_list.next;
2656 list_del_init(tmp);
2657
2658 hub = list_entry(tmp, struct usb_hub, event_list);
2659 hdev = hub->hdev;
2660 intf = to_usb_interface(hub->intfdev);
2661 hub_dev = &intf->dev;
2662
2663 i = hub->resume_root_hub;
2664
2665 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2666 hdev->state, hub->descriptor
2667 ? hub->descriptor->bNbrPorts
2668 : 0,
2669 /* NOTE: expects max 15 ports... */
2670 (u16) hub->change_bits[0],
2671 (u16) hub->event_bits[0],
2672 i ? ", resume root" : "");
2673
2674 usb_get_intf(intf);
2675 spin_unlock_irq(&hub_event_lock);
2676
2677 /* Is this is a root hub wanting to reactivate the downstream
2678 * ports? If so, be sure the interface resumes even if its
2679 * stub "device" node was never suspended.
2680 */
2681 if (i) {
2682 dpm_runtime_resume(&hdev->dev);
2683 dpm_runtime_resume(&intf->dev);
2684 }
2685
2686 /* Lock the device, then check to see if we were
2687 * disconnected while waiting for the lock to succeed. */
2688 if (locktree(hdev) < 0) {
2689 usb_put_intf(intf);
2690 continue;
2691 }
2692 if (hub != usb_get_intfdata(intf))
2693 goto loop;
2694
2695 /* If the hub has died, clean up after it */
2696 if (hdev->state == USB_STATE_NOTATTACHED) {
2697 hub_pre_reset(hub);
2698 goto loop;
2699 }
2700
2701 /* If this is an inactive or suspended hub, do nothing */
2702 if (hub->quiescing)
2703 goto loop;
2704
2705 if (hub->error) {
2706 dev_dbg (hub_dev, "resetting for error %d\n",
2707 hub->error);
2708
2709 ret = usb_reset_device(hdev);
2710 if (ret) {
2711 dev_dbg (hub_dev,
2712 "error resetting hub: %d\n", ret);
2713 goto loop;
2714 }
2715
2716 hub->nerrors = 0;
2717 hub->error = 0;
2718 }
2719
2720 /* deal with port status changes */
2721 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2722 if (test_bit(i, hub->busy_bits))
2723 continue;
2724 connect_change = test_bit(i, hub->change_bits);
2725 if (!test_and_clear_bit(i, hub->event_bits) &&
2726 !connect_change && !hub->activating)
2727 continue;
2728
2729 ret = hub_port_status(hub, i,
2730 &portstatus, &portchange);
2731 if (ret < 0)
2732 continue;
2733
2734 if (hub->activating && !hdev->children[i-1] &&
2735 (portstatus &
2736 USB_PORT_STAT_CONNECTION))
2737 connect_change = 1;
2738
2739 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2740 clear_port_feature(hdev, i,
2741 USB_PORT_FEAT_C_CONNECTION);
2742 connect_change = 1;
2743 }
2744
2745 if (portchange & USB_PORT_STAT_C_ENABLE) {
2746 if (!connect_change)
2747 dev_dbg (hub_dev,
2748 "port %d enable change, "
2749 "status %08x\n",
2750 i, portstatus);
2751 clear_port_feature(hdev, i,
2752 USB_PORT_FEAT_C_ENABLE);
2753
2754 /*
2755 * EM interference sometimes causes badly
2756 * shielded USB devices to be shutdown by
2757 * the hub, this hack enables them again.
2758 * Works at least with mouse driver.
2759 */
2760 if (!(portstatus & USB_PORT_STAT_ENABLE)
2761 && !connect_change
2762 && hdev->children[i-1]) {
2763 dev_err (hub_dev,
2764 "port %i "
2765 "disabled by hub (EMI?), "
2766 "re-enabling...\n",
2767 i);
2768 connect_change = 1;
2769 }
2770 }
2771
2772 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2773 clear_port_feature(hdev, i,
2774 USB_PORT_FEAT_C_SUSPEND);
2775 if (hdev->children[i-1]) {
2776 ret = remote_wakeup(hdev->
2777 children[i-1]);
2778 if (ret < 0)
2779 connect_change = 1;
2780 } else {
2781 ret = -ENODEV;
2782 hub_port_disable(hub, i, 1);
2783 }
2784 dev_dbg (hub_dev,
2785 "resume on port %d, status %d\n",
2786 i, ret);
2787 }
2788
2789 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2790 dev_err (hub_dev,
2791 "over-current change on port %d\n",
2792 i);
2793 clear_port_feature(hdev, i,
2794 USB_PORT_FEAT_C_OVER_CURRENT);
2795 hub_power_on(hub);
2796 }
2797
2798 if (portchange & USB_PORT_STAT_C_RESET) {
2799 dev_dbg (hub_dev,
2800 "reset change on port %d\n",
2801 i);
2802 clear_port_feature(hdev, i,
2803 USB_PORT_FEAT_C_RESET);
2804 }
2805
2806 if (connect_change)
2807 hub_port_connect_change(hub, i,
2808 portstatus, portchange);
2809 } /* end for i */
2810
2811 /* deal with hub status changes */
2812 if (test_and_clear_bit(0, hub->event_bits) == 0)
2813 ; /* do nothing */
2814 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2815 dev_err (hub_dev, "get_hub_status failed\n");
2816 else {
2817 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2818 dev_dbg (hub_dev, "power change\n");
2819 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2820 }
2821 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2822 dev_dbg (hub_dev, "overcurrent change\n");
2823 msleep(500); /* Cool down */
2824 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2825 hub_power_on(hub);
2826 }
2827 }
2828
2829 hub->activating = 0;
2830
2831 /* If this is a root hub, tell the HCD it's okay to
2832 * re-enable port-change interrupts now. */
2833 if (!hdev->parent)
2834 usb_enable_root_hub_irq(hdev->bus);
2835
2836 loop:
2837 usb_unlock_device(hdev);
2838 usb_put_intf(intf);
2839
2840 } /* end while (1) */
2841 }
2842
2843 static int hub_thread(void *__unused)
2844 {
2845 do {
2846 hub_events();
2847 wait_event_interruptible(khubd_wait,
2848 !list_empty(&hub_event_list) ||
2849 kthread_should_stop());
2850 try_to_freeze();
2851 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2852
2853 pr_debug("%s: khubd exiting\n", usbcore_name);
2854 return 0;
2855 }
2856
2857 static struct usb_device_id hub_id_table [] = {
2858 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2859 .bDeviceClass = USB_CLASS_HUB},
2860 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2861 .bInterfaceClass = USB_CLASS_HUB},
2862 { } /* Terminating entry */
2863 };
2864
2865 MODULE_DEVICE_TABLE (usb, hub_id_table);
2866
2867 static struct usb_driver hub_driver = {
2868 .name = "hub",
2869 .probe = hub_probe,
2870 .disconnect = hub_disconnect,
2871 .suspend = hub_suspend,
2872 .resume = hub_resume,
2873 .ioctl = hub_ioctl,
2874 .id_table = hub_id_table,
2875 };
2876
2877 int usb_hub_init(void)
2878 {
2879 if (usb_register(&hub_driver) < 0) {
2880 printk(KERN_ERR "%s: can't register hub driver\n",
2881 usbcore_name);
2882 return -1;
2883 }
2884
2885 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2886 if (!IS_ERR(khubd_task))
2887 return 0;
2888
2889 /* Fall through if kernel_thread failed */
2890 usb_deregister(&hub_driver);
2891 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2892
2893 return -1;
2894 }
2895
2896 void usb_hub_cleanup(void)
2897 {
2898 kthread_stop(khubd_task);
2899
2900 /*
2901 * Hub resources are freed for us by usb_deregister. It calls
2902 * usb_driver_purge on every device which in turn calls that
2903 * devices disconnect function if it is using this driver.
2904 * The hub_disconnect function takes care of releasing the
2905 * individual hub resources. -greg
2906 */
2907 usb_deregister(&hub_driver);
2908 } /* usb_hub_cleanup() */
2909
2910 static int config_descriptors_changed(struct usb_device *udev)
2911 {
2912 unsigned index;
2913 unsigned len = 0;
2914 struct usb_config_descriptor *buf;
2915
2916 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2917 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2918 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2919 }
2920 buf = kmalloc (len, SLAB_KERNEL);
2921 if (buf == NULL) {
2922 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2923 /* assume the worst */
2924 return 1;
2925 }
2926 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2927 int length;
2928 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2929
2930 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2931 old_length);
2932 if (length < old_length) {
2933 dev_dbg(&udev->dev, "config index %d, error %d\n",
2934 index, length);
2935 break;
2936 }
2937 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2938 != 0) {
2939 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2940 index, buf->bConfigurationValue);
2941 break;
2942 }
2943 }
2944 kfree(buf);
2945 return index != udev->descriptor.bNumConfigurations;
2946 }
2947
2948 /**
2949 * usb_reset_device - perform a USB port reset to reinitialize a device
2950 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2951 *
2952 * WARNING - don't reset any device unless drivers for all of its
2953 * interfaces are expecting that reset! Maybe some driver->reset()
2954 * method should eventually help ensure sufficient cooperation.
2955 *
2956 * Do a port reset, reassign the device's address, and establish its
2957 * former operating configuration. If the reset fails, or the device's
2958 * descriptors change from their values before the reset, or the original
2959 * configuration and altsettings cannot be restored, a flag will be set
2960 * telling khubd to pretend the device has been disconnected and then
2961 * re-connected. All drivers will be unbound, and the device will be
2962 * re-enumerated and probed all over again.
2963 *
2964 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2965 * flagged for logical disconnection, or some other negative error code
2966 * if the reset wasn't even attempted.
2967 *
2968 * The caller must own the device lock. For example, it's safe to use
2969 * this from a driver probe() routine after downloading new firmware.
2970 * For calls that might not occur during probe(), drivers should lock
2971 * the device using usb_lock_device_for_reset().
2972 */
2973 int usb_reset_device(struct usb_device *udev)
2974 {
2975 struct usb_device *parent_hdev = udev->parent;
2976 struct usb_hub *parent_hub;
2977 struct usb_device_descriptor descriptor = udev->descriptor;
2978 struct usb_hub *hub = NULL;
2979 int i, ret = 0, port1 = -1;
2980
2981 if (udev->state == USB_STATE_NOTATTACHED ||
2982 udev->state == USB_STATE_SUSPENDED) {
2983 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2984 udev->state);
2985 return -EINVAL;
2986 }
2987
2988 if (!parent_hdev) {
2989 /* this requires hcd-specific logic; see OHCI hc_restart() */
2990 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2991 return -EISDIR;
2992 }
2993
2994 for (i = 0; i < parent_hdev->maxchild; i++)
2995 if (parent_hdev->children[i] == udev) {
2996 port1 = i + 1;
2997 break;
2998 }
2999
3000 if (port1 < 0) {
3001 /* If this ever happens, it's very bad */
3002 dev_err(&udev->dev, "Can't locate device's port!\n");
3003 return -ENOENT;
3004 }
3005 parent_hub = hdev_to_hub(parent_hdev);
3006
3007 /* If we're resetting an active hub, take some special actions */
3008 if (udev->actconfig &&
3009 udev->actconfig->interface[0]->dev.driver ==
3010 &hub_driver.driver &&
3011 (hub = hdev_to_hub(udev)) != NULL) {
3012 hub_pre_reset(hub);
3013 }
3014
3015 set_bit(port1, parent_hub->busy_bits);
3016 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3017
3018 /* ep0 maxpacket size may change; let the HCD know about it.
3019 * Other endpoints will be handled by re-enumeration. */
3020 ep0_reinit(udev);
3021 ret = hub_port_init(parent_hub, udev, port1, i);
3022 if (ret >= 0)
3023 break;
3024 }
3025 clear_bit(port1, parent_hub->busy_bits);
3026 if (ret < 0)
3027 goto re_enumerate;
3028
3029 /* Device might have changed firmware (DFU or similar) */
3030 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3031 || config_descriptors_changed (udev)) {
3032 dev_info(&udev->dev, "device firmware changed\n");
3033 udev->descriptor = descriptor; /* for disconnect() calls */
3034 goto re_enumerate;
3035 }
3036
3037 if (!udev->actconfig)
3038 goto done;
3039
3040 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3041 USB_REQ_SET_CONFIGURATION, 0,
3042 udev->actconfig->desc.bConfigurationValue, 0,
3043 NULL, 0, USB_CTRL_SET_TIMEOUT);
3044 if (ret < 0) {
3045 dev_err(&udev->dev,
3046 "can't restore configuration #%d (error=%d)\n",
3047 udev->actconfig->desc.bConfigurationValue, ret);
3048 goto re_enumerate;
3049 }
3050 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3051
3052 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3053 struct usb_interface *intf = udev->actconfig->interface[i];
3054 struct usb_interface_descriptor *desc;
3055
3056 /* set_interface resets host side toggle even
3057 * for altsetting zero. the interface may have no driver.
3058 */
3059 desc = &intf->cur_altsetting->desc;
3060 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3061 desc->bAlternateSetting);
3062 if (ret < 0) {
3063 dev_err(&udev->dev, "failed to restore interface %d "
3064 "altsetting %d (error=%d)\n",
3065 desc->bInterfaceNumber,
3066 desc->bAlternateSetting,
3067 ret);
3068 goto re_enumerate;
3069 }
3070 }
3071
3072 done:
3073 if (hub)
3074 hub_post_reset(hub);
3075 return 0;
3076
3077 re_enumerate:
3078 hub_port_logical_disconnect(parent_hub, port1);
3079 return -ENODEV;
3080 }
Verdex Pro support