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USB: fix autosuspend when CONFIG_PM isn't set
[linux-2.6/cjktty.git] / drivers / usb / core / hub.c
blob7676690a0386aedc56242def77c874825714b13b
1 /*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/smp_lock.h>
20 #include <linux/ioctl.h>
21 #include <linux/usb.h>
22 #include <linux/usbdevice_fs.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
25
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 ->dev.sem, 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 = 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 =
435 le16_to_cpu(hub->descriptor->wHubCharacteristics);
436
437 /* Enable power on each port. Some hubs have reserved values
438 * of LPSM (> 2) in their descriptors, even though they are
439 * USB 2.0 hubs. Some hubs do not implement port-power switching
440 * but only emulate it. In all cases, the ports won't work
441 * unless we send these messages to the hub.
442 */
443 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
444 dev_dbg(hub->intfdev, "enabling power on all ports\n");
445 else
446 dev_dbg(hub->intfdev, "trying to enable port power on "
447 "non-switchable hub\n");
448 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
449 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
450
451 /* Wait at least 100 msec for power to become stable */
452 msleep(max(pgood_delay, (unsigned) 100));
453 }
454
455 static void hub_quiesce(struct usb_hub *hub)
456 {
457 /* (nonblocking) khubd and related activity won't re-trigger */
458 hub->quiescing = 1;
459 hub->activating = 0;
460 hub->resume_root_hub = 0;
461
462 /* (blocking) stop khubd and related activity */
463 usb_kill_urb(hub->urb);
464 if (hub->has_indicators)
465 cancel_delayed_work(&hub->leds);
466 if (hub->has_indicators || hub->tt.hub)
467 flush_scheduled_work();
468 }
469
470 static void hub_activate(struct usb_hub *hub)
471 {
472 int status;
473
474 hub->quiescing = 0;
475 hub->activating = 1;
476 hub->resume_root_hub = 0;
477 status = usb_submit_urb(hub->urb, GFP_NOIO);
478 if (status < 0)
479 dev_err(hub->intfdev, "activate --> %d\n", status);
480 if (hub->has_indicators && blinkenlights)
481 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
482
483 /* scan all ports ASAP */
484 kick_khubd(hub);
485 }
486
487 static int hub_hub_status(struct usb_hub *hub,
488 u16 *status, u16 *change)
489 {
490 int ret;
491
492 ret = get_hub_status(hub->hdev, &hub->status->hub);
493 if (ret < 0)
494 dev_err (hub->intfdev,
495 "%s failed (err = %d)\n", __FUNCTION__, ret);
496 else {
497 *status = le16_to_cpu(hub->status->hub.wHubStatus);
498 *change = le16_to_cpu(hub->status->hub.wHubChange);
499 ret = 0;
500 }
501 return ret;
502 }
503
504 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
505 {
506 struct usb_device *hdev = hub->hdev;
507 int ret;
508
509 if (hdev->children[port1-1] && set_state) {
510 usb_set_device_state(hdev->children[port1-1],
511 USB_STATE_NOTATTACHED);
512 }
513 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
514 if (ret)
515 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
516 port1, ret);
517
518 return ret;
519 }
520
521
522 /* caller has locked the hub device */
523 static void hub_pre_reset(struct usb_interface *intf)
524 {
525 struct usb_hub *hub = usb_get_intfdata(intf);
526 struct usb_device *hdev = hub->hdev;
527 int port1;
528
529 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
530 if (hdev->children[port1 - 1]) {
531 usb_disconnect(&hdev->children[port1 - 1]);
532 if (hub->error == 0)
533 hub_port_disable(hub, port1, 0);
534 }
535 }
536 hub_quiesce(hub);
537 }
538
539 /* caller has locked the hub device */
540 static void hub_post_reset(struct usb_interface *intf)
541 {
542 struct usb_hub *hub = usb_get_intfdata(intf);
543
544 hub_activate(hub);
545 hub_power_on(hub);
546 }
547
548
549 static int hub_configure(struct usb_hub *hub,
550 struct usb_endpoint_descriptor *endpoint)
551 {
552 struct usb_device *hdev = hub->hdev;
553 struct device *hub_dev = hub->intfdev;
554 u16 hubstatus, hubchange;
555 u16 wHubCharacteristics;
556 unsigned int pipe;
557 int maxp, ret;
558 char *message;
559
560 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
561 &hub->buffer_dma);
562 if (!hub->buffer) {
563 message = "can't allocate hub irq buffer";
564 ret = -ENOMEM;
565 goto fail;
566 }
567
568 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
569 if (!hub->status) {
570 message = "can't kmalloc hub status buffer";
571 ret = -ENOMEM;
572 goto fail;
573 }
574
575 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
576 if (!hub->descriptor) {
577 message = "can't kmalloc hub descriptor";
578 ret = -ENOMEM;
579 goto fail;
580 }
581
582 /* Request the entire hub descriptor.
583 * hub->descriptor can handle USB_MAXCHILDREN ports,
584 * but the hub can/will return fewer bytes here.
585 */
586 ret = get_hub_descriptor(hdev, hub->descriptor,
587 sizeof(*hub->descriptor));
588 if (ret < 0) {
589 message = "can't read hub descriptor";
590 goto fail;
591 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
592 message = "hub has too many ports!";
593 ret = -ENODEV;
594 goto fail;
595 }
596
597 hdev->maxchild = hub->descriptor->bNbrPorts;
598 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
599 (hdev->maxchild == 1) ? "" : "s");
600
601 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
602
603 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
604 int i;
605 char portstr [USB_MAXCHILDREN + 1];
606
607 for (i = 0; i < hdev->maxchild; i++)
608 portstr[i] = hub->descriptor->DeviceRemovable
609 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
610 ? 'F' : 'R';
611 portstr[hdev->maxchild] = 0;
612 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
613 } else
614 dev_dbg(hub_dev, "standalone hub\n");
615
616 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
617 case 0x00:
618 dev_dbg(hub_dev, "ganged power switching\n");
619 break;
620 case 0x01:
621 dev_dbg(hub_dev, "individual port power switching\n");
622 break;
623 case 0x02:
624 case 0x03:
625 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
626 break;
627 }
628
629 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
630 case 0x00:
631 dev_dbg(hub_dev, "global over-current protection\n");
632 break;
633 case 0x08:
634 dev_dbg(hub_dev, "individual port over-current protection\n");
635 break;
636 case 0x10:
637 case 0x18:
638 dev_dbg(hub_dev, "no over-current protection\n");
639 break;
640 }
641
642 spin_lock_init (&hub->tt.lock);
643 INIT_LIST_HEAD (&hub->tt.clear_list);
644 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
645 switch (hdev->descriptor.bDeviceProtocol) {
646 case 0:
647 break;
648 case 1:
649 dev_dbg(hub_dev, "Single TT\n");
650 hub->tt.hub = hdev;
651 break;
652 case 2:
653 ret = usb_set_interface(hdev, 0, 1);
654 if (ret == 0) {
655 dev_dbg(hub_dev, "TT per port\n");
656 hub->tt.multi = 1;
657 } else
658 dev_err(hub_dev, "Using single TT (err %d)\n",
659 ret);
660 hub->tt.hub = hdev;
661 break;
662 default:
663 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
664 hdev->descriptor.bDeviceProtocol);
665 break;
666 }
667
668 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
669 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
670 case HUB_TTTT_8_BITS:
671 if (hdev->descriptor.bDeviceProtocol != 0) {
672 hub->tt.think_time = 666;
673 dev_dbg(hub_dev, "TT requires at most %d "
674 "FS bit times (%d ns)\n",
675 8, hub->tt.think_time);
676 }
677 break;
678 case HUB_TTTT_16_BITS:
679 hub->tt.think_time = 666 * 2;
680 dev_dbg(hub_dev, "TT requires at most %d "
681 "FS bit times (%d ns)\n",
682 16, hub->tt.think_time);
683 break;
684 case HUB_TTTT_24_BITS:
685 hub->tt.think_time = 666 * 3;
686 dev_dbg(hub_dev, "TT requires at most %d "
687 "FS bit times (%d ns)\n",
688 24, hub->tt.think_time);
689 break;
690 case HUB_TTTT_32_BITS:
691 hub->tt.think_time = 666 * 4;
692 dev_dbg(hub_dev, "TT requires at most %d "
693 "FS bit times (%d ns)\n",
694 32, hub->tt.think_time);
695 break;
696 }
697
698 /* probe() zeroes hub->indicator[] */
699 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
700 hub->has_indicators = 1;
701 dev_dbg(hub_dev, "Port indicators are supported\n");
702 }
703
704 dev_dbg(hub_dev, "power on to power good time: %dms\n",
705 hub->descriptor->bPwrOn2PwrGood * 2);
706
707 /* power budgeting mostly matters with bus-powered hubs,
708 * and battery-powered root hubs (may provide just 8 mA).
709 */
710 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
711 if (ret < 2) {
712 message = "can't get hub status";
713 goto fail;
714 }
715 le16_to_cpus(&hubstatus);
716 if (hdev == hdev->bus->root_hub) {
717 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
718 hub->mA_per_port = 500;
719 else {
720 hub->mA_per_port = hdev->bus_mA;
721 hub->limited_power = 1;
722 }
723 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
724 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
725 hub->descriptor->bHubContrCurrent);
726 hub->limited_power = 1;
727 if (hdev->maxchild > 0) {
728 int remaining = hdev->bus_mA -
729 hub->descriptor->bHubContrCurrent;
730
731 if (remaining < hdev->maxchild * 100)
732 dev_warn(hub_dev,
733 "insufficient power available "
734 "to use all downstream ports\n");
735 hub->mA_per_port = 100; /* 7.2.1.1 */
736 }
737 } else { /* Self-powered external hub */
738 /* FIXME: What about battery-powered external hubs that
739 * provide less current per port? */
740 hub->mA_per_port = 500;
741 }
742 if (hub->mA_per_port < 500)
743 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
744 hub->mA_per_port);
745
746 ret = hub_hub_status(hub, &hubstatus, &hubchange);
747 if (ret < 0) {
748 message = "can't get hub status";
749 goto fail;
750 }
751
752 /* local power status reports aren't always correct */
753 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
754 dev_dbg(hub_dev, "local power source is %s\n",
755 (hubstatus & HUB_STATUS_LOCAL_POWER)
756 ? "lost (inactive)" : "good");
757
758 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
759 dev_dbg(hub_dev, "%sover-current condition exists\n",
760 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
761
762 /* set up the interrupt endpoint */
763 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
764 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
765
766 if (maxp > sizeof(*hub->buffer))
767 maxp = sizeof(*hub->buffer);
768
769 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
770 if (!hub->urb) {
771 message = "couldn't allocate interrupt urb";
772 ret = -ENOMEM;
773 goto fail;
774 }
775
776 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
777 hub, endpoint->bInterval);
778 hub->urb->transfer_dma = hub->buffer_dma;
779 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
780
781 /* maybe cycle the hub leds */
782 if (hub->has_indicators && blinkenlights)
783 hub->indicator [0] = INDICATOR_CYCLE;
784
785 hub_power_on(hub);
786 hub_activate(hub);
787 return 0;
788
789 fail:
790 dev_err (hub_dev, "config failed, %s (err %d)\n",
791 message, ret);
792 /* hub_disconnect() frees urb and descriptor */
793 return ret;
794 }
795
796 static unsigned highspeed_hubs;
797
798 static void hub_disconnect(struct usb_interface *intf)
799 {
800 struct usb_hub *hub = usb_get_intfdata (intf);
801 struct usb_device *hdev;
802
803 /* Disconnect all children and quiesce the hub */
804 hub->error = 0;
805 hub_pre_reset(intf);
806
807 usb_set_intfdata (intf, NULL);
808 hdev = hub->hdev;
809
810 if (hdev->speed == USB_SPEED_HIGH)
811 highspeed_hubs--;
812
813 usb_free_urb(hub->urb);
814 hub->urb = NULL;
815
816 spin_lock_irq(&hub_event_lock);
817 list_del_init(&hub->event_list);
818 spin_unlock_irq(&hub_event_lock);
819
820 kfree(hub->descriptor);
821 hub->descriptor = NULL;
822
823 kfree(hub->status);
824 hub->status = NULL;
825
826 if (hub->buffer) {
827 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
828 hub->buffer_dma);
829 hub->buffer = NULL;
830 }
831
832 kfree(hub);
833 }
834
835 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
836 {
837 struct usb_host_interface *desc;
838 struct usb_endpoint_descriptor *endpoint;
839 struct usb_device *hdev;
840 struct usb_hub *hub;
841
842 desc = intf->cur_altsetting;
843 hdev = interface_to_usbdev(intf);
844
845 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
846 if (hdev->parent) {
847 dev_warn(&intf->dev, "ignoring external hub\n");
848 return -ENODEV;
849 }
850 #endif
851
852 /* Some hubs have a subclass of 1, which AFAICT according to the */
853 /* specs is not defined, but it works */
854 if ((desc->desc.bInterfaceSubClass != 0) &&
855 (desc->desc.bInterfaceSubClass != 1)) {
856 descriptor_error:
857 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
858 return -EIO;
859 }
860
861 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
862 if (desc->desc.bNumEndpoints != 1)
863 goto descriptor_error;
864
865 endpoint = &desc->endpoint[0].desc;
866
867 /* If it's not an interrupt in endpoint, we'd better punt! */
868 if (!usb_endpoint_is_int_in(endpoint))
869 goto descriptor_error;
870
871 /* We found a hub */
872 dev_info (&intf->dev, "USB hub found\n");
873
874 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
875 if (!hub) {
876 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
877 return -ENOMEM;
878 }
879
880 INIT_LIST_HEAD(&hub->event_list);
881 hub->intfdev = &intf->dev;
882 hub->hdev = hdev;
883 INIT_WORK(&hub->leds, led_work, hub);
884
885 usb_set_intfdata (intf, hub);
886
887 if (hdev->speed == USB_SPEED_HIGH)
888 highspeed_hubs++;
889
890 if (hub_configure(hub, endpoint) >= 0)
891 return 0;
892
893 hub_disconnect (intf);
894 return -ENODEV;
895 }
896
897 static int
898 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
899 {
900 struct usb_device *hdev = interface_to_usbdev (intf);
901
902 /* assert ifno == 0 (part of hub spec) */
903 switch (code) {
904 case USBDEVFS_HUB_PORTINFO: {
905 struct usbdevfs_hub_portinfo *info = user_data;
906 int i;
907
908 spin_lock_irq(&device_state_lock);
909 if (hdev->devnum <= 0)
910 info->nports = 0;
911 else {
912 info->nports = hdev->maxchild;
913 for (i = 0; i < info->nports; i++) {
914 if (hdev->children[i] == NULL)
915 info->port[i] = 0;
916 else
917 info->port[i] =
918 hdev->children[i]->devnum;
919 }
920 }
921 spin_unlock_irq(&device_state_lock);
922
923 return info->nports + 1;
924 }
925
926 default:
927 return -ENOSYS;
928 }
929 }
930
931
932 /* grab device/port lock, returning index of that port (zero based).
933 * protects the upstream link used by this device from concurrent
934 * tree operations like suspend, resume, reset, and disconnect, which
935 * apply to everything downstream of a given port.
936 */
937 static int locktree(struct usb_device *udev)
938 {
939 int t;
940 struct usb_device *hdev;
941
942 if (!udev)
943 return -ENODEV;
944
945 /* root hub is always the first lock in the series */
946 hdev = udev->parent;
947 if (!hdev) {
948 usb_lock_device(udev);
949 return 0;
950 }
951
952 /* on the path from root to us, lock everything from
953 * top down, dropping parent locks when not needed
954 */
955 t = locktree(hdev);
956 if (t < 0)
957 return t;
958
959 /* everything is fail-fast once disconnect
960 * processing starts
961 */
962 if (udev->state == USB_STATE_NOTATTACHED) {
963 usb_unlock_device(hdev);
964 return -ENODEV;
965 }
966
967 /* when everyone grabs locks top->bottom,
968 * non-overlapping work may be concurrent
969 */
970 usb_lock_device(udev);
971 usb_unlock_device(hdev);
972 return udev->portnum;
973 }
974
975 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
976 {
977 int i;
978
979 for (i = 0; i < udev->maxchild; ++i) {
980 if (udev->children[i])
981 recursively_mark_NOTATTACHED(udev->children[i]);
982 }
983 udev->state = USB_STATE_NOTATTACHED;
984 }
985
986 /**
987 * usb_set_device_state - change a device's current state (usbcore, hcds)
988 * @udev: pointer to device whose state should be changed
989 * @new_state: new state value to be stored
990 *
991 * udev->state is _not_ fully protected by the device lock. Although
992 * most transitions are made only while holding the lock, the state can
993 * can change to USB_STATE_NOTATTACHED at almost any time. This
994 * is so that devices can be marked as disconnected as soon as possible,
995 * without having to wait for any semaphores to be released. As a result,
996 * all changes to any device's state must be protected by the
997 * device_state_lock spinlock.
998 *
999 * Once a device has been added to the device tree, all changes to its state
1000 * should be made using this routine. The state should _not_ be set directly.
1001 *
1002 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1003 * Otherwise udev->state is set to new_state, and if new_state is
1004 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1005 * to USB_STATE_NOTATTACHED.
1006 */
1007 void usb_set_device_state(struct usb_device *udev,
1008 enum usb_device_state new_state)
1009 {
1010 unsigned long flags;
1011
1012 spin_lock_irqsave(&device_state_lock, flags);
1013 if (udev->state == USB_STATE_NOTATTACHED)
1014 ; /* do nothing */
1015 else if (new_state != USB_STATE_NOTATTACHED) {
1016
1017 /* root hub wakeup capabilities are managed out-of-band
1018 * and may involve silicon errata ... ignore them here.
1019 */
1020 if (udev->parent) {
1021 if (udev->state == USB_STATE_SUSPENDED
1022 || new_state == USB_STATE_SUSPENDED)
1023 ; /* No change to wakeup settings */
1024 else if (new_state == USB_STATE_CONFIGURED)
1025 device_init_wakeup(&udev->dev,
1026 (udev->actconfig->desc.bmAttributes
1027 & USB_CONFIG_ATT_WAKEUP));
1028 else
1029 device_init_wakeup(&udev->dev, 0);
1030 }
1031 udev->state = new_state;
1032 } else
1033 recursively_mark_NOTATTACHED(udev);
1034 spin_unlock_irqrestore(&device_state_lock, flags);
1035 }
1036
1037
1038 #ifdef CONFIG_PM
1039
1040 /**
1041 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1042 * @rhdev: struct usb_device for the root hub
1043 *
1044 * The USB host controller driver calls this function when its root hub
1045 * is resumed and Vbus power has been interrupted or the controller
1046 * has been reset. The routine marks all the children of the root hub
1047 * as NOTATTACHED and marks logical connect-change events on their ports.
1048 */
1049 void usb_root_hub_lost_power(struct usb_device *rhdev)
1050 {
1051 struct usb_hub *hub;
1052 int port1;
1053 unsigned long flags;
1054
1055 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1056
1057 /* Make sure no potential wakeup events get lost,
1058 * by forcing the root hub to be resumed.
1059 */
1060 rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1061
1062 spin_lock_irqsave(&device_state_lock, flags);
1063 hub = hdev_to_hub(rhdev);
1064 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1065 if (rhdev->children[port1 - 1]) {
1066 recursively_mark_NOTATTACHED(
1067 rhdev->children[port1 - 1]);
1068 set_bit(port1, hub->change_bits);
1069 }
1070 }
1071 spin_unlock_irqrestore(&device_state_lock, flags);
1072 }
1073 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1074
1075 #endif /* CONFIG_PM */
1076
1077 static void choose_address(struct usb_device *udev)
1078 {
1079 int devnum;
1080 struct usb_bus *bus = udev->bus;
1081
1082 /* If khubd ever becomes multithreaded, this will need a lock */
1083
1084 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1085 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1086 bus->devnum_next);
1087 if (devnum >= 128)
1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1089
1090 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1091
1092 if (devnum < 128) {
1093 set_bit(devnum, bus->devmap.devicemap);
1094 udev->devnum = devnum;
1095 }
1096 }
1097
1098 static void release_address(struct usb_device *udev)
1099 {
1100 if (udev->devnum > 0) {
1101 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1102 udev->devnum = -1;
1103 }
1104 }
1105
1106 /**
1107 * usb_disconnect - disconnect a device (usbcore-internal)
1108 * @pdev: pointer to device being disconnected
1109 * Context: !in_interrupt ()
1110 *
1111 * Something got disconnected. Get rid of it and all of its children.
1112 *
1113 * If *pdev is a normal device then the parent hub must already be locked.
1114 * If *pdev is a root hub then this routine will acquire the
1115 * usb_bus_list_lock on behalf of the caller.
1116 *
1117 * Only hub drivers (including virtual root hub drivers for host
1118 * controllers) should ever call this.
1119 *
1120 * This call is synchronous, and may not be used in an interrupt context.
1121 */
1122 void usb_disconnect(struct usb_device **pdev)
1123 {
1124 struct usb_device *udev = *pdev;
1125 int i;
1126
1127 if (!udev) {
1128 pr_debug ("%s nodev\n", __FUNCTION__);
1129 return;
1130 }
1131
1132 /* mark the device as inactive, so any further urb submissions for
1133 * this device (and any of its children) will fail immediately.
1134 * this quiesces everyting except pending urbs.
1135 */
1136 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1137 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1138
1139 usb_lock_device(udev);
1140
1141 /* Free up all the children before we remove this device */
1142 for (i = 0; i < USB_MAXCHILDREN; i++) {
1143 if (udev->children[i])
1144 usb_disconnect(&udev->children[i]);
1145 }
1146
1147 /* deallocate hcd/hardware state ... nuking all pending urbs and
1148 * cleaning up all state associated with the current configuration
1149 * so that the hardware is now fully quiesced.
1150 */
1151 dev_dbg (&udev->dev, "unregistering device\n");
1152 usb_disable_device(udev, 0);
1153
1154 usb_unlock_device(udev);
1155
1156 /* Unregister the device. The device driver is responsible
1157 * for removing the device files from usbfs and sysfs and for
1158 * de-configuring the device.
1159 */
1160 device_del(&udev->dev);
1161
1162 /* Free the device number and delete the parent's children[]
1163 * (or root_hub) pointer.
1164 */
1165 release_address(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 put_device(&udev->dev);
1173 }
1174
1175 #ifdef DEBUG
1176 static void show_string(struct usb_device *udev, char *id, char *string)
1177 {
1178 if (!string)
1179 return;
1180 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1181 }
1182
1183 #else
1184 static inline void show_string(struct usb_device *udev, char *id, char *string)
1185 {}
1186 #endif
1187
1188
1189 #ifdef CONFIG_USB_OTG
1190 #include "otg_whitelist.h"
1191 #endif
1192
1193 /**
1194 * usb_new_device - perform initial device setup (usbcore-internal)
1195 * @udev: newly addressed device (in ADDRESS state)
1196 *
1197 * This is called with devices which have been enumerated, but not yet
1198 * configured. The device descriptor is available, but not descriptors
1199 * for any device configuration. The caller must have locked either
1200 * the parent hub (if udev is a normal device) or else the
1201 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1202 * udev has already been installed, but udev is not yet visible through
1203 * sysfs or other filesystem code.
1204 *
1205 * Returns 0 for success (device is configured and listed, with its
1206 * interfaces, in sysfs); else a negative errno value.
1207 *
1208 * This call is synchronous, and may not be used in an interrupt context.
1209 *
1210 * Only the hub driver or root-hub registrar should ever call this.
1211 */
1212 int usb_new_device(struct usb_device *udev)
1213 {
1214 int err;
1215
1216 err = usb_get_configuration(udev);
1217 if (err < 0) {
1218 dev_err(&udev->dev, "can't read configurations, error %d\n",
1219 err);
1220 goto fail;
1221 }
1222
1223 /* read the standard strings and cache them if present */
1224 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1225 udev->manufacturer = usb_cache_string(udev,
1226 udev->descriptor.iManufacturer);
1227 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1228
1229 /* Tell the world! */
1230 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1231 "SerialNumber=%d\n",
1232 udev->descriptor.iManufacturer,
1233 udev->descriptor.iProduct,
1234 udev->descriptor.iSerialNumber);
1235 show_string(udev, "Product", udev->product);
1236 show_string(udev, "Manufacturer", udev->manufacturer);
1237 show_string(udev, "SerialNumber", udev->serial);
1238
1239 #ifdef CONFIG_USB_OTG
1240 /*
1241 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1242 * to wake us after we've powered off VBUS; and HNP, switching roles
1243 * "host" to "peripheral". The OTG descriptor helps figure this out.
1244 */
1245 if (!udev->bus->is_b_host
1246 && udev->config
1247 && udev->parent == udev->bus->root_hub) {
1248 struct usb_otg_descriptor *desc = 0;
1249 struct usb_bus *bus = udev->bus;
1250
1251 /* descriptor may appear anywhere in config */
1252 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1253 le16_to_cpu(udev->config[0].desc.wTotalLength),
1254 USB_DT_OTG, (void **) &desc) == 0) {
1255 if (desc->bmAttributes & USB_OTG_HNP) {
1256 unsigned port1 = udev->portnum;
1257
1258 dev_info(&udev->dev,
1259 "Dual-Role OTG device on %sHNP port\n",
1260 (port1 == bus->otg_port)
1261 ? "" : "non-");
1262
1263 /* enable HNP before suspend, it's simpler */
1264 if (port1 == bus->otg_port)
1265 bus->b_hnp_enable = 1;
1266 err = usb_control_msg(udev,
1267 usb_sndctrlpipe(udev, 0),
1268 USB_REQ_SET_FEATURE, 0,
1269 bus->b_hnp_enable
1270 ? USB_DEVICE_B_HNP_ENABLE
1271 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1272 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1273 if (err < 0) {
1274 /* OTG MESSAGE: report errors here,
1275 * customize to match your product.
1276 */
1277 dev_info(&udev->dev,
1278 "can't set HNP mode; %d\n",
1279 err);
1280 bus->b_hnp_enable = 0;
1281 }
1282 }
1283 }
1284 }
1285
1286 if (!is_targeted(udev)) {
1287
1288 /* Maybe it can talk to us, though we can't talk to it.
1289 * (Includes HNP test device.)
1290 */
1291 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1292 static int __usb_port_suspend(struct usb_device *,
1293 int port1);
1294 err = __usb_port_suspend(udev, udev->bus->otg_port);
1295 if (err < 0)
1296 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1297 }
1298 err = -ENODEV;
1299 goto fail;
1300 }
1301 #endif
1302
1303 /* Register the device. The device driver is responsible
1304 * for adding the device files to usbfs and sysfs and for
1305 * configuring the device.
1306 */
1307 err = device_add (&udev->dev);
1308 if (err) {
1309 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1310 goto fail;
1311 }
1312
1313 return 0;
1314
1315 fail:
1316 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1317 return err;
1318 }
1319
1320
1321 static int hub_port_status(struct usb_hub *hub, int port1,
1322 u16 *status, u16 *change)
1323 {
1324 int ret;
1325
1326 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1327 if (ret < 0)
1328 dev_err (hub->intfdev,
1329 "%s failed (err = %d)\n", __FUNCTION__, ret);
1330 else {
1331 *status = le16_to_cpu(hub->status->port.wPortStatus);
1332 *change = le16_to_cpu(hub->status->port.wPortChange);
1333 ret = 0;
1334 }
1335 return ret;
1336 }
1337
1338
1339 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1340 static unsigned hub_is_wusb(struct usb_hub *hub)
1341 {
1342 struct usb_hcd *hcd;
1343 if (hub->hdev->parent != NULL) /* not a root hub? */
1344 return 0;
1345 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1346 return hcd->wireless;
1347 }
1348
1349
1350 #define PORT_RESET_TRIES 5
1351 #define SET_ADDRESS_TRIES 2
1352 #define GET_DESCRIPTOR_TRIES 2
1353 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1354 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1355
1356 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1357 #define HUB_SHORT_RESET_TIME 10
1358 #define HUB_LONG_RESET_TIME 200
1359 #define HUB_RESET_TIMEOUT 500
1360
1361 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1362 struct usb_device *udev, unsigned int delay)
1363 {
1364 int delay_time, ret;
1365 u16 portstatus;
1366 u16 portchange;
1367
1368 for (delay_time = 0;
1369 delay_time < HUB_RESET_TIMEOUT;
1370 delay_time += delay) {
1371 /* wait to give the device a chance to reset */
1372 msleep(delay);
1373
1374 /* read and decode port status */
1375 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1376 if (ret < 0)
1377 return ret;
1378
1379 /* Device went away? */
1380 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1381 return -ENOTCONN;
1382
1383 /* bomb out completely if something weird happened */
1384 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1385 return -EINVAL;
1386
1387 /* if we`ve finished resetting, then break out of the loop */
1388 if (!(portstatus & USB_PORT_STAT_RESET) &&
1389 (portstatus & USB_PORT_STAT_ENABLE)) {
1390 if (hub_is_wusb(hub))
1391 udev->speed = USB_SPEED_VARIABLE;
1392 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1393 udev->speed = USB_SPEED_HIGH;
1394 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1395 udev->speed = USB_SPEED_LOW;
1396 else
1397 udev->speed = USB_SPEED_FULL;
1398 return 0;
1399 }
1400
1401 /* switch to the long delay after two short delay failures */
1402 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1403 delay = HUB_LONG_RESET_TIME;
1404
1405 dev_dbg (hub->intfdev,
1406 "port %d not reset yet, waiting %dms\n",
1407 port1, delay);
1408 }
1409
1410 return -EBUSY;
1411 }
1412
1413 static int hub_port_reset(struct usb_hub *hub, int port1,
1414 struct usb_device *udev, unsigned int delay)
1415 {
1416 int i, status;
1417
1418 /* Reset the port */
1419 for (i = 0; i < PORT_RESET_TRIES; i++) {
1420 status = set_port_feature(hub->hdev,
1421 port1, USB_PORT_FEAT_RESET);
1422 if (status)
1423 dev_err(hub->intfdev,
1424 "cannot reset port %d (err = %d)\n",
1425 port1, status);
1426 else {
1427 status = hub_port_wait_reset(hub, port1, udev, delay);
1428 if (status && status != -ENOTCONN)
1429 dev_dbg(hub->intfdev,
1430 "port_wait_reset: err = %d\n",
1431 status);
1432 }
1433
1434 /* return on disconnect or reset */
1435 switch (status) {
1436 case 0:
1437 /* TRSTRCY = 10 ms; plus some extra */
1438 msleep(10 + 40);
1439 /* FALL THROUGH */
1440 case -ENOTCONN:
1441 case -ENODEV:
1442 clear_port_feature(hub->hdev,
1443 port1, USB_PORT_FEAT_C_RESET);
1444 /* FIXME need disconnect() for NOTATTACHED device */
1445 usb_set_device_state(udev, status
1446 ? USB_STATE_NOTATTACHED
1447 : USB_STATE_DEFAULT);
1448 return status;
1449 }
1450
1451 dev_dbg (hub->intfdev,
1452 "port %d not enabled, trying reset again...\n",
1453 port1);
1454 delay = HUB_LONG_RESET_TIME;
1455 }
1456
1457 dev_err (hub->intfdev,
1458 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1459 port1);
1460
1461 return status;
1462 }
1463
1464 /*
1465 * Disable a port and mark a logical connnect-change event, so that some
1466 * time later khubd will disconnect() any existing usb_device on the port
1467 * and will re-enumerate if there actually is a device attached.
1468 */
1469 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1470 {
1471 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1472 hub_port_disable(hub, port1, 1);
1473
1474 /* FIXME let caller ask to power down the port:
1475 * - some devices won't enumerate without a VBUS power cycle
1476 * - SRP saves power that way
1477 * - ... new call, TBD ...
1478 * That's easy if this hub can switch power per-port, and
1479 * khubd reactivates the port later (timer, SRP, etc).
1480 * Powerdown must be optional, because of reset/DFU.
1481 */
1482
1483 set_bit(port1, hub->change_bits);
1484 kick_khubd(hub);
1485 }
1486
1487 #ifdef CONFIG_PM
1488
1489 #ifdef CONFIG_USB_SUSPEND
1490
1491 /*
1492 * Selective port suspend reduces power; most suspended devices draw
1493 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1494 * All devices below the suspended port are also suspended.
1495 *
1496 * Devices leave suspend state when the host wakes them up. Some devices
1497 * also support "remote wakeup", where the device can activate the USB
1498 * tree above them to deliver data, such as a keypress or packet. In
1499 * some cases, this wakes the USB host.
1500 */
1501 static int hub_port_suspend(struct usb_hub *hub, int port1,
1502 struct usb_device *udev)
1503 {
1504 int status;
1505
1506 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1507
1508 /* enable remote wakeup when appropriate; this lets the device
1509 * wake up the upstream hub (including maybe the root hub).
1510 *
1511 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1512 * we don't explicitly enable it here.
1513 */
1514 if (udev->do_remote_wakeup) {
1515 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1516 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1517 USB_DEVICE_REMOTE_WAKEUP, 0,
1518 NULL, 0,
1519 USB_CTRL_SET_TIMEOUT);
1520 if (status)
1521 dev_dbg(&udev->dev,
1522 "won't remote wakeup, status %d\n",
1523 status);
1524 }
1525
1526 /* see 7.1.7.6 */
1527 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1528 if (status) {
1529 dev_dbg(hub->intfdev,
1530 "can't suspend port %d, status %d\n",
1531 port1, status);
1532 /* paranoia: "should not happen" */
1533 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1534 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1535 USB_DEVICE_REMOTE_WAKEUP, 0,
1536 NULL, 0,
1537 USB_CTRL_SET_TIMEOUT);
1538 } else {
1539 /* device has up to 10 msec to fully suspend */
1540 dev_dbg(&udev->dev, "usb %ssuspend\n",
1541 udev->auto_pm ? "auto-" : "");
1542 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1543 msleep(10);
1544 }
1545 return status;
1546 }
1547
1548 /*
1549 * Devices on USB hub ports have only one "suspend" state, corresponding
1550 * to ACPI D2, "may cause the device to lose some context".
1551 * State transitions include:
1552 *
1553 * - suspend, resume ... when the VBUS power link stays live
1554 * - suspend, disconnect ... VBUS lost
1555 *
1556 * Once VBUS drop breaks the circuit, the port it's using has to go through
1557 * normal re-enumeration procedures, starting with enabling VBUS power.
1558 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1559 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1560 * timer, no SRP, no requests through sysfs.
1561 *
1562 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1563 * the root hub for their bus goes into global suspend ... so we don't
1564 * (falsely) update the device power state to say it suspended.
1565 */
1566 static int __usb_port_suspend (struct usb_device *udev, int port1)
1567 {
1568 int status = 0;
1569
1570 /* caller owns the udev device lock */
1571 if (port1 < 0)
1572 return port1;
1573
1574 /* we change the device's upstream USB link,
1575 * but root hubs have no upstream USB link.
1576 */
1577 if (udev->parent)
1578 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1579 udev);
1580 else {
1581 dev_dbg(&udev->dev, "usb %ssuspend\n",
1582 udev->auto_pm ? "auto-" : "");
1583 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1584 }
1585 return status;
1586 }
1587
1588 /*
1589 * usb_port_suspend - suspend a usb device's upstream port
1590 * @udev: device that's no longer in active use
1591 * Context: must be able to sleep; device not locked; pm locks held
1592 *
1593 * Suspends a USB device that isn't in active use, conserving power.
1594 * Devices may wake out of a suspend, if anything important happens,
1595 * using the remote wakeup mechanism. They may also be taken out of
1596 * suspend by the host, using usb_port_resume(). It's also routine
1597 * to disconnect devices while they are suspended.
1598 *
1599 * This only affects the USB hardware for a device; its interfaces
1600 * (and, for hubs, child devices) must already have been suspended.
1601 *
1602 * Suspending OTG devices may trigger HNP, if that's been enabled
1603 * between a pair of dual-role devices. That will change roles, such
1604 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1605 *
1606 * Returns 0 on success, else negative errno.
1607 */
1608 int usb_port_suspend(struct usb_device *udev)
1609 {
1610 return __usb_port_suspend(udev, udev->portnum);
1611 }
1612
1613 /*
1614 * If the USB "suspend" state is in use (rather than "global suspend"),
1615 * many devices will be individually taken out of suspend state using
1616 * special" resume" signaling. These routines kick in shortly after
1617 * hardware resume signaling is finished, either because of selective
1618 * resume (by host) or remote wakeup (by device) ... now see what changed
1619 * in the tree that's rooted at this device.
1620 */
1621 static int finish_port_resume(struct usb_device *udev)
1622 {
1623 int status;
1624 u16 devstatus;
1625
1626 /* caller owns the udev device lock */
1627 dev_dbg(&udev->dev, "finish resume\n");
1628
1629 /* usb ch9 identifies four variants of SUSPENDED, based on what
1630 * state the device resumes to. Linux currently won't see the
1631 * first two on the host side; they'd be inside hub_port_init()
1632 * during many timeouts, but khubd can't suspend until later.
1633 */
1634 usb_set_device_state(udev, udev->actconfig
1635 ? USB_STATE_CONFIGURED
1636 : USB_STATE_ADDRESS);
1637
1638 /* 10.5.4.5 says be sure devices in the tree are still there.
1639 * For now let's assume the device didn't go crazy on resume,
1640 * and device drivers will know about any resume quirks.
1641 */
1642 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1643 if (status >= 0)
1644 status = (status == 2 ? 0 : -ENODEV);
1645
1646 if (status)
1647 dev_dbg(&udev->dev,
1648 "gone after usb resume? status %d\n",
1649 status);
1650 else if (udev->actconfig) {
1651 le16_to_cpus(&devstatus);
1652 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1653 && udev->parent) {
1654 status = usb_control_msg(udev,
1655 usb_sndctrlpipe(udev, 0),
1656 USB_REQ_CLEAR_FEATURE,
1657 USB_RECIP_DEVICE,
1658 USB_DEVICE_REMOTE_WAKEUP, 0,
1659 NULL, 0,
1660 USB_CTRL_SET_TIMEOUT);
1661 if (status)
1662 dev_dbg(&udev->dev, "disable remote "
1663 "wakeup, status %d\n", status);
1664 }
1665 status = 0;
1666
1667 } else if (udev->devnum <= 0) {
1668 dev_dbg(&udev->dev, "bogus resume!\n");
1669 status = -EINVAL;
1670 }
1671 return status;
1672 }
1673
1674 static int
1675 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1676 {
1677 int status;
1678
1679 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1680
1681 set_bit(port1, hub->busy_bits);
1682
1683 /* see 7.1.7.7; affects power usage, but not budgeting */
1684 status = clear_port_feature(hub->hdev,
1685 port1, USB_PORT_FEAT_SUSPEND);
1686 if (status) {
1687 dev_dbg(hub->intfdev,
1688 "can't resume port %d, status %d\n",
1689 port1, status);
1690 } else {
1691 u16 devstatus;
1692 u16 portchange;
1693
1694 /* drive resume for at least 20 msec */
1695 if (udev)
1696 dev_dbg(&udev->dev, "usb %sresume\n",
1697 udev->auto_pm ? "auto-" : "");
1698 msleep(25);
1699
1700 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1701 | USB_PORT_STAT_ENABLE \
1702 | USB_PORT_STAT_CONNECTION)
1703
1704 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1705 * stop resume signaling. Then finish the resume
1706 * sequence.
1707 */
1708 devstatus = portchange = 0;
1709 status = hub_port_status(hub, port1,
1710 &devstatus, &portchange);
1711 if (status < 0
1712 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1713 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1714 ) {
1715 dev_dbg(hub->intfdev,
1716 "port %d status %04x.%04x after resume, %d\n",
1717 port1, portchange, devstatus, status);
1718 if (status >= 0)
1719 status = -ENODEV;
1720 } else {
1721 if (portchange & USB_PORT_STAT_C_SUSPEND)
1722 clear_port_feature(hub->hdev, port1,
1723 USB_PORT_FEAT_C_SUSPEND);
1724 /* TRSMRCY = 10 msec */
1725 msleep(10);
1726 if (udev)
1727 status = finish_port_resume(udev);
1728 }
1729 }
1730 if (status < 0)
1731 hub_port_logical_disconnect(hub, port1);
1732
1733 clear_bit(port1, hub->busy_bits);
1734 if (!hub->hdev->parent && !hub->busy_bits[0])
1735 usb_enable_root_hub_irq(hub->hdev->bus);
1736
1737 return status;
1738 }
1739
1740 /*
1741 * usb_port_resume - re-activate a suspended usb device's upstream port
1742 * @udev: device to re-activate
1743 * Context: must be able to sleep; device not locked; pm locks held
1744 *
1745 * This will re-activate the suspended device, increasing power usage
1746 * while letting drivers communicate again with its endpoints.
1747 * USB resume explicitly guarantees that the power session between
1748 * the host and the device is the same as it was when the device
1749 * suspended.
1750 *
1751 * Returns 0 on success, else negative errno.
1752 */
1753 int usb_port_resume(struct usb_device *udev)
1754 {
1755 int status;
1756
1757 /* we change the device's upstream USB link,
1758 * but root hubs have no upstream USB link.
1759 */
1760 if (udev->parent) {
1761 // NOTE this fails if parent is also suspended...
1762 status = hub_port_resume(hdev_to_hub(udev->parent),
1763 udev->portnum, udev);
1764 } else {
1765 dev_dbg(&udev->dev, "usb %sresume\n",
1766 udev->auto_pm ? "auto-" : "");
1767 status = finish_port_resume(udev);
1768 }
1769 if (status < 0)
1770 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1771 return status;
1772 }
1773
1774 static int remote_wakeup(struct usb_device *udev)
1775 {
1776 int status = 0;
1777
1778 /* All this just to avoid sending a port-resume message
1779 * to the parent hub! */
1780
1781 usb_lock_device(udev);
1782 usb_pm_lock(udev);
1783 if (udev->state == USB_STATE_SUSPENDED) {
1784 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1785 /* TRSMRCY = 10 msec */
1786 msleep(10);
1787 status = finish_port_resume(udev);
1788 if (status == 0)
1789 udev->dev.power.power_state.event = PM_EVENT_ON;
1790 }
1791 usb_pm_unlock(udev);
1792
1793 if (status == 0)
1794 usb_autoresume_device(udev, 0);
1795 usb_unlock_device(udev);
1796 return status;
1797 }
1798
1799 #else /* CONFIG_USB_SUSPEND */
1800
1801 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1802
1803 int usb_port_suspend(struct usb_device *udev)
1804 {
1805 return 0;
1806 }
1807
1808 static inline int
1809 finish_port_resume(struct usb_device *udev)
1810 {
1811 return 0;
1812 }
1813
1814 static inline int
1815 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1816 {
1817 return 0;
1818 }
1819
1820 int usb_port_resume(struct usb_device *udev)
1821 {
1822 return 0;
1823 }
1824
1825 static inline int remote_wakeup(struct usb_device *udev)
1826 {
1827 return 0;
1828 }
1829
1830 #endif
1831
1832 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1833 {
1834 struct usb_hub *hub = usb_get_intfdata (intf);
1835 struct usb_device *hdev = hub->hdev;
1836 unsigned port1;
1837
1838 /* fail if children aren't already suspended */
1839 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1840 struct usb_device *udev;
1841
1842 udev = hdev->children [port1-1];
1843 if (udev && msg.event == PM_EVENT_SUSPEND &&
1844 #ifdef CONFIG_USB_SUSPEND
1845 udev->state != USB_STATE_SUSPENDED
1846 #else
1847 udev->dev.power.power_state.event
1848 == PM_EVENT_ON
1849 #endif
1850 ) {
1851 if (!hdev->auto_pm)
1852 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1853 port1);
1854 return -EBUSY;
1855 }
1856 }
1857
1858 /* "global suspend" of the downstream HC-to-USB interface */
1859 if (!hdev->parent) {
1860 struct usb_bus *bus = hdev->bus;
1861 if (bus) {
1862 int status = hcd_bus_suspend (bus);
1863
1864 if (status != 0) {
1865 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1866 status);
1867 return status;
1868 }
1869 } else
1870 return -EOPNOTSUPP;
1871 }
1872
1873 /* stop khubd and related activity */
1874 hub_quiesce(hub);
1875 return 0;
1876 }
1877
1878 static int hub_resume(struct usb_interface *intf)
1879 {
1880 struct usb_device *hdev = interface_to_usbdev(intf);
1881 struct usb_hub *hub = usb_get_intfdata (intf);
1882 int status;
1883
1884 /* "global resume" of the downstream HC-to-USB interface */
1885 if (!hdev->parent) {
1886 struct usb_bus *bus = hdev->bus;
1887 if (bus) {
1888 status = hcd_bus_resume (bus);
1889 if (status) {
1890 dev_dbg(&intf->dev, "'global' resume %d\n",
1891 status);
1892 return status;
1893 }
1894 } else
1895 return -EOPNOTSUPP;
1896 if (status == 0) {
1897 /* TRSMRCY = 10 msec */
1898 msleep(10);
1899 }
1900 }
1901
1902 /* tell khubd to look for changes on this hub */
1903 hub_activate(hub);
1904 return 0;
1905 }
1906
1907 #else /* CONFIG_PM */
1908
1909 static inline int remote_wakeup(struct usb_device *udev)
1910 {
1911 return 0;
1912 }
1913
1914 #define hub_suspend NULL
1915 #define hub_resume NULL
1916 #endif
1917
1918 void usb_resume_root_hub(struct usb_device *hdev)
1919 {
1920 struct usb_hub *hub = hdev_to_hub(hdev);
1921
1922 hub->resume_root_hub = 1;
1923 kick_khubd(hub);
1924 }
1925
1926
1927 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1928 *
1929 * Between connect detection and reset signaling there must be a delay
1930 * of 100ms at least for debounce and power-settling. The corresponding
1931 * timer shall restart whenever the downstream port detects a disconnect.
1932 *
1933 * Apparently there are some bluetooth and irda-dongles and a number of
1934 * low-speed devices for which this debounce period may last over a second.
1935 * Not covered by the spec - but easy to deal with.
1936 *
1937 * This implementation uses a 1500ms total debounce timeout; if the
1938 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1939 * every 25ms for transient disconnects. When the port status has been
1940 * unchanged for 100ms it returns the port status.
1941 */
1942
1943 #define HUB_DEBOUNCE_TIMEOUT 1500
1944 #define HUB_DEBOUNCE_STEP 25
1945 #define HUB_DEBOUNCE_STABLE 100
1946
1947 static int hub_port_debounce(struct usb_hub *hub, int port1)
1948 {
1949 int ret;
1950 int total_time, stable_time = 0;
1951 u16 portchange, portstatus;
1952 unsigned connection = 0xffff;
1953
1954 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
1955 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1956 if (ret < 0)
1957 return ret;
1958
1959 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
1960 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
1961 stable_time += HUB_DEBOUNCE_STEP;
1962 if (stable_time >= HUB_DEBOUNCE_STABLE)
1963 break;
1964 } else {
1965 stable_time = 0;
1966 connection = portstatus & USB_PORT_STAT_CONNECTION;
1967 }
1968
1969 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1970 clear_port_feature(hub->hdev, port1,
1971 USB_PORT_FEAT_C_CONNECTION);
1972 }
1973
1974 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
1975 break;
1976 msleep(HUB_DEBOUNCE_STEP);
1977 }
1978
1979 dev_dbg (hub->intfdev,
1980 "debounce: port %d: total %dms stable %dms status 0x%x\n",
1981 port1, total_time, stable_time, portstatus);
1982
1983 if (stable_time < HUB_DEBOUNCE_STABLE)
1984 return -ETIMEDOUT;
1985 return portstatus;
1986 }
1987
1988 static void ep0_reinit(struct usb_device *udev)
1989 {
1990 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
1991 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
1992 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
1993 }
1994
1995 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
1996 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
1997
1998 static int hub_set_address(struct usb_device *udev)
1999 {
2000 int retval;
2001
2002 if (udev->devnum == 0)
2003 return -EINVAL;
2004 if (udev->state == USB_STATE_ADDRESS)
2005 return 0;
2006 if (udev->state != USB_STATE_DEFAULT)
2007 return -EINVAL;
2008 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2009 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2010 NULL, 0, USB_CTRL_SET_TIMEOUT);
2011 if (retval == 0) {
2012 usb_set_device_state(udev, USB_STATE_ADDRESS);
2013 ep0_reinit(udev);
2014 }
2015 return retval;
2016 }
2017
2018 /* Reset device, (re)assign address, get device descriptor.
2019 * Device connection must be stable, no more debouncing needed.
2020 * Returns device in USB_STATE_ADDRESS, except on error.
2021 *
2022 * If this is called for an already-existing device (as part of
2023 * usb_reset_device), the caller must own the device lock. For a
2024 * newly detected device that is not accessible through any global
2025 * pointers, it's not necessary to lock the device.
2026 */
2027 static int
2028 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2029 int retry_counter)
2030 {
2031 static DEFINE_MUTEX(usb_address0_mutex);
2032
2033 struct usb_device *hdev = hub->hdev;
2034 int i, j, retval;
2035 unsigned delay = HUB_SHORT_RESET_TIME;
2036 enum usb_device_speed oldspeed = udev->speed;
2037 char *speed, *type;
2038
2039 /* root hub ports have a slightly longer reset period
2040 * (from USB 2.0 spec, section 7.1.7.5)
2041 */
2042 if (!hdev->parent) {
2043 delay = HUB_ROOT_RESET_TIME;
2044 if (port1 == hdev->bus->otg_port)
2045 hdev->bus->b_hnp_enable = 0;
2046 }
2047
2048 /* Some low speed devices have problems with the quick delay, so */
2049 /* be a bit pessimistic with those devices. RHbug #23670 */
2050 if (oldspeed == USB_SPEED_LOW)
2051 delay = HUB_LONG_RESET_TIME;
2052
2053 mutex_lock(&usb_address0_mutex);
2054
2055 /* Reset the device; full speed may morph to high speed */
2056 retval = hub_port_reset(hub, port1, udev, delay);
2057 if (retval < 0) /* error or disconnect */
2058 goto fail;
2059 /* success, speed is known */
2060 retval = -ENODEV;
2061
2062 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2063 dev_dbg(&udev->dev, "device reset changed speed!\n");
2064 goto fail;
2065 }
2066 oldspeed = udev->speed;
2067
2068 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2069 * it's fixed size except for full speed devices.
2070 * For Wireless USB devices, ep0 max packet is always 512 (tho
2071 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2072 */
2073 switch (udev->speed) {
2074 case USB_SPEED_VARIABLE: /* fixed at 512 */
2075 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2076 break;
2077 case USB_SPEED_HIGH: /* fixed at 64 */
2078 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2079 break;
2080 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2081 /* to determine the ep0 maxpacket size, try to read
2082 * the device descriptor to get bMaxPacketSize0 and
2083 * then correct our initial guess.
2084 */
2085 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2086 break;
2087 case USB_SPEED_LOW: /* fixed at 8 */
2088 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2089 break;
2090 default:
2091 goto fail;
2092 }
2093
2094 type = "";
2095 switch (udev->speed) {
2096 case USB_SPEED_LOW: speed = "low"; break;
2097 case USB_SPEED_FULL: speed = "full"; break;
2098 case USB_SPEED_HIGH: speed = "high"; break;
2099 case USB_SPEED_VARIABLE:
2100 speed = "variable";
2101 type = "Wireless ";
2102 break;
2103 default: speed = "?"; break;
2104 }
2105 dev_info (&udev->dev,
2106 "%s %s speed %sUSB device using %s and address %d\n",
2107 (udev->config) ? "reset" : "new", speed, type,
2108 udev->bus->controller->driver->name, udev->devnum);
2109
2110 /* Set up TT records, if needed */
2111 if (hdev->tt) {
2112 udev->tt = hdev->tt;
2113 udev->ttport = hdev->ttport;
2114 } else if (udev->speed != USB_SPEED_HIGH
2115 && hdev->speed == USB_SPEED_HIGH) {
2116 udev->tt = &hub->tt;
2117 udev->ttport = port1;
2118 }
2119
2120 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2121 * Because device hardware and firmware is sometimes buggy in
2122 * this area, and this is how Linux has done it for ages.
2123 * Change it cautiously.
2124 *
2125 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2126 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2127 * so it may help with some non-standards-compliant devices.
2128 * Otherwise we start with SET_ADDRESS and then try to read the
2129 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2130 * value.
2131 */
2132 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2133 if (USE_NEW_SCHEME(retry_counter)) {
2134 struct usb_device_descriptor *buf;
2135 int r = 0;
2136
2137 #define GET_DESCRIPTOR_BUFSIZE 64
2138 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2139 if (!buf) {
2140 retval = -ENOMEM;
2141 continue;
2142 }
2143
2144 /* Use a short timeout the first time through,
2145 * so that recalcitrant full-speed devices with
2146 * 8- or 16-byte ep0-maxpackets won't slow things
2147 * down tremendously by NAKing the unexpectedly
2148 * early status stage. Also, retry on all errors;
2149 * some devices are flakey.
2150 * 255 is for WUSB devices, we actually need to use 512.
2151 * WUSB1.0[4.8.1].
2152 */
2153 for (j = 0; j < 3; ++j) {
2154 buf->bMaxPacketSize0 = 0;
2155 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2156 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2157 USB_DT_DEVICE << 8, 0,
2158 buf, GET_DESCRIPTOR_BUFSIZE,
2159 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2160 switch (buf->bMaxPacketSize0) {
2161 case 8: case 16: case 32: case 64: case 255:
2162 if (buf->bDescriptorType ==
2163 USB_DT_DEVICE) {
2164 r = 0;
2165 break;
2166 }
2167 /* FALL THROUGH */
2168 default:
2169 if (r == 0)
2170 r = -EPROTO;
2171 break;
2172 }
2173 if (r == 0)
2174 break;
2175 }
2176 udev->descriptor.bMaxPacketSize0 =
2177 buf->bMaxPacketSize0;
2178 kfree(buf);
2179
2180 retval = hub_port_reset(hub, port1, udev, delay);
2181 if (retval < 0) /* error or disconnect */
2182 goto fail;
2183 if (oldspeed != udev->speed) {
2184 dev_dbg(&udev->dev,
2185 "device reset changed speed!\n");
2186 retval = -ENODEV;
2187 goto fail;
2188 }
2189 if (r) {
2190 dev_err(&udev->dev, "device descriptor "
2191 "read/%s, error %d\n",
2192 "64", r);
2193 retval = -EMSGSIZE;
2194 continue;
2195 }
2196 #undef GET_DESCRIPTOR_BUFSIZE
2197 }
2198
2199 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2200 retval = hub_set_address(udev);
2201 if (retval >= 0)
2202 break;
2203 msleep(200);
2204 }
2205 if (retval < 0) {
2206 dev_err(&udev->dev,
2207 "device not accepting address %d, error %d\n",
2208 udev->devnum, retval);
2209 goto fail;
2210 }
2211
2212 /* cope with hardware quirkiness:
2213 * - let SET_ADDRESS settle, some device hardware wants it
2214 * - read ep0 maxpacket even for high and low speed,
2215 */
2216 msleep(10);
2217 if (USE_NEW_SCHEME(retry_counter))
2218 break;
2219
2220 retval = usb_get_device_descriptor(udev, 8);
2221 if (retval < 8) {
2222 dev_err(&udev->dev, "device descriptor "
2223 "read/%s, error %d\n",
2224 "8", retval);
2225 if (retval >= 0)
2226 retval = -EMSGSIZE;
2227 } else {
2228 retval = 0;
2229 break;
2230 }
2231 }
2232 if (retval)
2233 goto fail;
2234
2235 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2236 512 : udev->descriptor.bMaxPacketSize0;
2237 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2238 if (udev->speed != USB_SPEED_FULL ||
2239 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2240 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2241 retval = -EMSGSIZE;
2242 goto fail;
2243 }
2244 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2245 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2246 ep0_reinit(udev);
2247 }
2248
2249 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2250 if (retval < (signed)sizeof(udev->descriptor)) {
2251 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2252 "all", retval);
2253 if (retval >= 0)
2254 retval = -ENOMSG;
2255 goto fail;
2256 }
2257
2258 retval = 0;
2259
2260 fail:
2261 if (retval)
2262 hub_port_disable(hub, port1, 0);
2263 mutex_unlock(&usb_address0_mutex);
2264 return retval;
2265 }
2266
2267 static void
2268 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2269 {
2270 struct usb_qualifier_descriptor *qual;
2271 int status;
2272
2273 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2274 if (qual == NULL)
2275 return;
2276
2277 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2278 qual, sizeof *qual);
2279 if (status == sizeof *qual) {
2280 dev_info(&udev->dev, "not running at top speed; "
2281 "connect to a high speed hub\n");
2282 /* hub LEDs are probably harder to miss than syslog */
2283 if (hub->has_indicators) {
2284 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2285 schedule_work (&hub->leds);
2286 }
2287 }
2288 kfree(qual);
2289 }
2290
2291 static unsigned
2292 hub_power_remaining (struct usb_hub *hub)
2293 {
2294 struct usb_device *hdev = hub->hdev;
2295 int remaining;
2296 int port1;
2297
2298 if (!hub->limited_power)
2299 return 0;
2300
2301 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2302 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2303 struct usb_device *udev = hdev->children[port1 - 1];
2304 int delta;
2305
2306 if (!udev)
2307 continue;
2308
2309 /* Unconfigured devices may not use more than 100mA,
2310 * or 8mA for OTG ports */
2311 if (udev->actconfig)
2312 delta = udev->actconfig->desc.bMaxPower * 2;
2313 else if (port1 != udev->bus->otg_port || hdev->parent)
2314 delta = 100;
2315 else
2316 delta = 8;
2317 if (delta > hub->mA_per_port)
2318 dev_warn(&udev->dev, "%dmA is over %umA budget "
2319 "for port %d!\n",
2320 delta, hub->mA_per_port, port1);
2321 remaining -= delta;
2322 }
2323 if (remaining < 0) {
2324 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2325 - remaining);
2326 remaining = 0;
2327 }
2328 return remaining;
2329 }
2330
2331 /* Handle physical or logical connection change events.
2332 * This routine is called when:
2333 * a port connection-change occurs;
2334 * a port enable-change occurs (often caused by EMI);
2335 * usb_reset_device() encounters changed descriptors (as from
2336 * a firmware download)
2337 * caller already locked the hub
2338 */
2339 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2340 u16 portstatus, u16 portchange)
2341 {
2342 struct usb_device *hdev = hub->hdev;
2343 struct device *hub_dev = hub->intfdev;
2344 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2345 int status, i;
2346
2347 dev_dbg (hub_dev,
2348 "port %d, status %04x, change %04x, %s\n",
2349 port1, portstatus, portchange, portspeed (portstatus));
2350
2351 if (hub->has_indicators) {
2352 set_port_led(hub, port1, HUB_LED_AUTO);
2353 hub->indicator[port1-1] = INDICATOR_AUTO;
2354 }
2355
2356 /* Disconnect any existing devices under this port */
2357 if (hdev->children[port1-1])
2358 usb_disconnect(&hdev->children[port1-1]);
2359 clear_bit(port1, hub->change_bits);
2360
2361 #ifdef CONFIG_USB_OTG
2362 /* during HNP, don't repeat the debounce */
2363 if (hdev->bus->is_b_host)
2364 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2365 #endif
2366
2367 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2368 status = hub_port_debounce(hub, port1);
2369 if (status < 0) {
2370 dev_err (hub_dev,
2371 "connect-debounce failed, port %d disabled\n",
2372 port1);
2373 goto done;
2374 }
2375 portstatus = status;
2376 }
2377
2378 /* Return now if nothing is connected */
2379 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2380
2381 /* maybe switch power back on (e.g. root hub was reset) */
2382 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2383 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2384 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2385
2386 if (portstatus & USB_PORT_STAT_ENABLE)
2387 goto done;
2388 return;
2389 }
2390
2391 #ifdef CONFIG_USB_SUSPEND
2392 /* If something is connected, but the port is suspended, wake it up. */
2393 if (portstatus & USB_PORT_STAT_SUSPEND) {
2394 status = hub_port_resume(hub, port1, NULL);
2395 if (status < 0) {
2396 dev_dbg(hub_dev,
2397 "can't clear suspend on port %d; %d\n",
2398 port1, status);
2399 goto done;
2400 }
2401 }
2402 #endif
2403
2404 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2405 struct usb_device *udev;
2406
2407 /* reallocate for each attempt, since references
2408 * to the previous one can escape in various ways
2409 */
2410 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2411 if (!udev) {
2412 dev_err (hub_dev,
2413 "couldn't allocate port %d usb_device\n",
2414 port1);
2415 goto done;
2416 }
2417
2418 usb_set_device_state(udev, USB_STATE_POWERED);
2419 udev->speed = USB_SPEED_UNKNOWN;
2420 udev->bus_mA = hub->mA_per_port;
2421 udev->level = hdev->level + 1;
2422
2423 /* set the address */
2424 choose_address(udev);
2425 if (udev->devnum <= 0) {
2426 status = -ENOTCONN; /* Don't retry */
2427 goto loop;
2428 }
2429
2430 /* reset and get descriptor */
2431 status = hub_port_init(hub, udev, port1, i);
2432 if (status < 0)
2433 goto loop;
2434
2435 /* consecutive bus-powered hubs aren't reliable; they can
2436 * violate the voltage drop budget. if the new child has
2437 * a "powered" LED, users should notice we didn't enable it
2438 * (without reading syslog), even without per-port LEDs
2439 * on the parent.
2440 */
2441 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2442 && udev->bus_mA <= 100) {
2443 u16 devstat;
2444
2445 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2446 &devstat);
2447 if (status < 2) {
2448 dev_dbg(&udev->dev, "get status %d ?\n", status);
2449 goto loop_disable;
2450 }
2451 le16_to_cpus(&devstat);
2452 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2453 dev_err(&udev->dev,
2454 "can't connect bus-powered hub "
2455 "to this port\n");
2456 if (hub->has_indicators) {
2457 hub->indicator[port1-1] =
2458 INDICATOR_AMBER_BLINK;
2459 schedule_work (&hub->leds);
2460 }
2461 status = -ENOTCONN; /* Don't retry */
2462 goto loop_disable;
2463 }
2464 }
2465
2466 /* check for devices running slower than they could */
2467 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2468 && udev->speed == USB_SPEED_FULL
2469 && highspeed_hubs != 0)
2470 check_highspeed (hub, udev, port1);
2471
2472 /* Store the parent's children[] pointer. At this point
2473 * udev becomes globally accessible, although presumably
2474 * no one will look at it until hdev is unlocked.
2475 */
2476 status = 0;
2477
2478 /* We mustn't add new devices if the parent hub has
2479 * been disconnected; we would race with the
2480 * recursively_mark_NOTATTACHED() routine.
2481 */
2482 spin_lock_irq(&device_state_lock);
2483 if (hdev->state == USB_STATE_NOTATTACHED)
2484 status = -ENOTCONN;
2485 else
2486 hdev->children[port1-1] = udev;
2487 spin_unlock_irq(&device_state_lock);
2488
2489 /* Run it through the hoops (find a driver, etc) */
2490 if (!status) {
2491 status = usb_new_device(udev);
2492 if (status) {
2493 spin_lock_irq(&device_state_lock);
2494 hdev->children[port1-1] = NULL;
2495 spin_unlock_irq(&device_state_lock);
2496 }
2497 }
2498
2499 if (status)
2500 goto loop_disable;
2501
2502 status = hub_power_remaining(hub);
2503 if (status)
2504 dev_dbg(hub_dev, "%dmA power budget left\n", status);
2505
2506 return;
2507
2508 loop_disable:
2509 hub_port_disable(hub, port1, 1);
2510 loop:
2511 ep0_reinit(udev);
2512 release_address(udev);
2513 usb_put_dev(udev);
2514 if (status == -ENOTCONN)
2515 break;
2516 }
2517
2518 done:
2519 hub_port_disable(hub, port1, 1);
2520 }
2521
2522 static void hub_events(void)
2523 {
2524 struct list_head *tmp;
2525 struct usb_device *hdev;
2526 struct usb_interface *intf;
2527 struct usb_hub *hub;
2528 struct device *hub_dev;
2529 u16 hubstatus;
2530 u16 hubchange;
2531 u16 portstatus;
2532 u16 portchange;
2533 int i, ret;
2534 int connect_change;
2535
2536 /*
2537 * We restart the list every time to avoid a deadlock with
2538 * deleting hubs downstream from this one. This should be
2539 * safe since we delete the hub from the event list.
2540 * Not the most efficient, but avoids deadlocks.
2541 */
2542 while (1) {
2543
2544 /* Grab the first entry at the beginning of the list */
2545 spin_lock_irq(&hub_event_lock);
2546 if (list_empty(&hub_event_list)) {
2547 spin_unlock_irq(&hub_event_lock);
2548 break;
2549 }
2550
2551 tmp = hub_event_list.next;
2552 list_del_init(tmp);
2553
2554 hub = list_entry(tmp, struct usb_hub, event_list);
2555 hdev = hub->hdev;
2556 intf = to_usb_interface(hub->intfdev);
2557 hub_dev = &intf->dev;
2558
2559 i = hub->resume_root_hub;
2560
2561 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2562 hdev->state, hub->descriptor
2563 ? hub->descriptor->bNbrPorts
2564 : 0,
2565 /* NOTE: expects max 15 ports... */
2566 (u16) hub->change_bits[0],
2567 (u16) hub->event_bits[0],
2568 i ? ", resume root" : "");
2569
2570 usb_get_intf(intf);
2571 spin_unlock_irq(&hub_event_lock);
2572
2573 /* Lock the device, then check to see if we were
2574 * disconnected while waiting for the lock to succeed. */
2575 if (locktree(hdev) < 0) {
2576 usb_put_intf(intf);
2577 continue;
2578 }
2579 if (hub != usb_get_intfdata(intf))
2580 goto loop;
2581
2582 /* If the hub has died, clean up after it */
2583 if (hdev->state == USB_STATE_NOTATTACHED) {
2584 hub->error = -ENODEV;
2585 hub_pre_reset(intf);
2586 goto loop;
2587 }
2588
2589 /* Is this is a root hub wanting to reactivate the downstream
2590 * ports? If so, be sure the interface resumes even if its
2591 * stub "device" node was never suspended.
2592 */
2593 if (i)
2594 usb_autoresume_device(hdev, 0);
2595
2596 /* If this is an inactive or suspended hub, do nothing */
2597 if (hub->quiescing)
2598 goto loop;
2599
2600 if (hub->error) {
2601 dev_dbg (hub_dev, "resetting for error %d\n",
2602 hub->error);
2603
2604 ret = usb_reset_composite_device(hdev, intf);
2605 if (ret) {
2606 dev_dbg (hub_dev,
2607 "error resetting hub: %d\n", ret);
2608 goto loop;
2609 }
2610
2611 hub->nerrors = 0;
2612 hub->error = 0;
2613 }
2614
2615 /* deal with port status changes */
2616 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2617 if (test_bit(i, hub->busy_bits))
2618 continue;
2619 connect_change = test_bit(i, hub->change_bits);
2620 if (!test_and_clear_bit(i, hub->event_bits) &&
2621 !connect_change && !hub->activating)
2622 continue;
2623
2624 ret = hub_port_status(hub, i,
2625 &portstatus, &portchange);
2626 if (ret < 0)
2627 continue;
2628
2629 if (hub->activating && !hdev->children[i-1] &&
2630 (portstatus &
2631 USB_PORT_STAT_CONNECTION))
2632 connect_change = 1;
2633
2634 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2635 clear_port_feature(hdev, i,
2636 USB_PORT_FEAT_C_CONNECTION);
2637 connect_change = 1;
2638 }
2639
2640 if (portchange & USB_PORT_STAT_C_ENABLE) {
2641 if (!connect_change)
2642 dev_dbg (hub_dev,
2643 "port %d enable change, "
2644 "status %08x\n",
2645 i, portstatus);
2646 clear_port_feature(hdev, i,
2647 USB_PORT_FEAT_C_ENABLE);
2648
2649 /*
2650 * EM interference sometimes causes badly
2651 * shielded USB devices to be shutdown by
2652 * the hub, this hack enables them again.
2653 * Works at least with mouse driver.
2654 */
2655 if (!(portstatus & USB_PORT_STAT_ENABLE)
2656 && !connect_change
2657 && hdev->children[i-1]) {
2658 dev_err (hub_dev,
2659 "port %i "
2660 "disabled by hub (EMI?), "
2661 "re-enabling...\n",
2662 i);
2663 connect_change = 1;
2664 }
2665 }
2666
2667 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2668 clear_port_feature(hdev, i,
2669 USB_PORT_FEAT_C_SUSPEND);
2670 if (hdev->children[i-1]) {
2671 ret = remote_wakeup(hdev->
2672 children[i-1]);
2673 if (ret < 0)
2674 connect_change = 1;
2675 } else {
2676 ret = -ENODEV;
2677 hub_port_disable(hub, i, 1);
2678 }
2679 dev_dbg (hub_dev,
2680 "resume on port %d, status %d\n",
2681 i, ret);
2682 }
2683
2684 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2685 dev_err (hub_dev,
2686 "over-current change on port %d\n",
2687 i);
2688 clear_port_feature(hdev, i,
2689 USB_PORT_FEAT_C_OVER_CURRENT);
2690 hub_power_on(hub);
2691 }
2692
2693 if (portchange & USB_PORT_STAT_C_RESET) {
2694 dev_dbg (hub_dev,
2695 "reset change on port %d\n",
2696 i);
2697 clear_port_feature(hdev, i,
2698 USB_PORT_FEAT_C_RESET);
2699 }
2700
2701 if (connect_change)
2702 hub_port_connect_change(hub, i,
2703 portstatus, portchange);
2704 } /* end for i */
2705
2706 /* deal with hub status changes */
2707 if (test_and_clear_bit(0, hub->event_bits) == 0)
2708 ; /* do nothing */
2709 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2710 dev_err (hub_dev, "get_hub_status failed\n");
2711 else {
2712 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2713 dev_dbg (hub_dev, "power change\n");
2714 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2715 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2716 /* FIXME: Is this always true? */
2717 hub->limited_power = 0;
2718 else
2719 hub->limited_power = 1;
2720 }
2721 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2722 dev_dbg (hub_dev, "overcurrent change\n");
2723 msleep(500); /* Cool down */
2724 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2725 hub_power_on(hub);
2726 }
2727 }
2728
2729 hub->activating = 0;
2730
2731 /* If this is a root hub, tell the HCD it's okay to
2732 * re-enable port-change interrupts now. */
2733 if (!hdev->parent && !hub->busy_bits[0])
2734 usb_enable_root_hub_irq(hdev->bus);
2735
2736 loop:
2737 usb_unlock_device(hdev);
2738 usb_put_intf(intf);
2739
2740 } /* end while (1) */
2741 }
2742
2743 static int hub_thread(void *__unused)
2744 {
2745 do {
2746 hub_events();
2747 wait_event_interruptible(khubd_wait,
2748 !list_empty(&hub_event_list) ||
2749 kthread_should_stop());
2750 try_to_freeze();
2751 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2752
2753 pr_debug("%s: khubd exiting\n", usbcore_name);
2754 return 0;
2755 }
2756
2757 static struct usb_device_id hub_id_table [] = {
2758 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2759 .bDeviceClass = USB_CLASS_HUB},
2760 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2761 .bInterfaceClass = USB_CLASS_HUB},
2762 { } /* Terminating entry */
2763 };
2764
2765 MODULE_DEVICE_TABLE (usb, hub_id_table);
2766
2767 static struct usb_driver hub_driver = {
2768 .name = "hub",
2769 .probe = hub_probe,
2770 .disconnect = hub_disconnect,
2771 .suspend = hub_suspend,
2772 .resume = hub_resume,
2773 .pre_reset = hub_pre_reset,
2774 .post_reset = hub_post_reset,
2775 .ioctl = hub_ioctl,
2776 .id_table = hub_id_table,
2777 };
2778
2779 int usb_hub_init(void)
2780 {
2781 if (usb_register(&hub_driver) < 0) {
2782 printk(KERN_ERR "%s: can't register hub driver\n",
2783 usbcore_name);
2784 return -1;
2785 }
2786
2787 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2788 if (!IS_ERR(khubd_task))
2789 return 0;
2790
2791 /* Fall through if kernel_thread failed */
2792 usb_deregister(&hub_driver);
2793 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2794
2795 return -1;
2796 }
2797
2798 void usb_hub_cleanup(void)
2799 {
2800 kthread_stop(khubd_task);
2801
2802 /*
2803 * Hub resources are freed for us by usb_deregister. It calls
2804 * usb_driver_purge on every device which in turn calls that
2805 * devices disconnect function if it is using this driver.
2806 * The hub_disconnect function takes care of releasing the
2807 * individual hub resources. -greg
2808 */
2809 usb_deregister(&hub_driver);
2810 } /* usb_hub_cleanup() */
2811
2812 static int config_descriptors_changed(struct usb_device *udev)
2813 {
2814 unsigned index;
2815 unsigned len = 0;
2816 struct usb_config_descriptor *buf;
2817
2818 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2819 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2820 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2821 }
2822 buf = kmalloc (len, SLAB_KERNEL);
2823 if (buf == NULL) {
2824 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2825 /* assume the worst */
2826 return 1;
2827 }
2828 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2829 int length;
2830 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2831
2832 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2833 old_length);
2834 if (length < old_length) {
2835 dev_dbg(&udev->dev, "config index %d, error %d\n",
2836 index, length);
2837 break;
2838 }
2839 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2840 != 0) {
2841 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2842 index, buf->bConfigurationValue);
2843 break;
2844 }
2845 }
2846 kfree(buf);
2847 return index != udev->descriptor.bNumConfigurations;
2848 }
2849
2850 /**
2851 * usb_reset_device - perform a USB port reset to reinitialize a device
2852 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2853 *
2854 * WARNING - don't use this routine to reset a composite device
2855 * (one with multiple interfaces owned by separate drivers)!
2856 * Use usb_reset_composite_device() instead.
2857 *
2858 * Do a port reset, reassign the device's address, and establish its
2859 * former operating configuration. If the reset fails, or the device's
2860 * descriptors change from their values before the reset, or the original
2861 * configuration and altsettings cannot be restored, a flag will be set
2862 * telling khubd to pretend the device has been disconnected and then
2863 * re-connected. All drivers will be unbound, and the device will be
2864 * re-enumerated and probed all over again.
2865 *
2866 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2867 * flagged for logical disconnection, or some other negative error code
2868 * if the reset wasn't even attempted.
2869 *
2870 * The caller must own the device lock. For example, it's safe to use
2871 * this from a driver probe() routine after downloading new firmware.
2872 * For calls that might not occur during probe(), drivers should lock
2873 * the device using usb_lock_device_for_reset().
2874 */
2875 int usb_reset_device(struct usb_device *udev)
2876 {
2877 struct usb_device *parent_hdev = udev->parent;
2878 struct usb_hub *parent_hub;
2879 struct usb_device_descriptor descriptor = udev->descriptor;
2880 int i, ret = 0;
2881 int port1 = udev->portnum;
2882
2883 if (udev->state == USB_STATE_NOTATTACHED ||
2884 udev->state == USB_STATE_SUSPENDED) {
2885 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2886 udev->state);
2887 return -EINVAL;
2888 }
2889
2890 if (!parent_hdev) {
2891 /* this requires hcd-specific logic; see OHCI hc_restart() */
2892 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2893 return -EISDIR;
2894 }
2895 parent_hub = hdev_to_hub(parent_hdev);
2896
2897 set_bit(port1, parent_hub->busy_bits);
2898 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2899
2900 /* ep0 maxpacket size may change; let the HCD know about it.
2901 * Other endpoints will be handled by re-enumeration. */
2902 ep0_reinit(udev);
2903 ret = hub_port_init(parent_hub, udev, port1, i);
2904 if (ret >= 0)
2905 break;
2906 }
2907 clear_bit(port1, parent_hub->busy_bits);
2908 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2909 usb_enable_root_hub_irq(parent_hdev->bus);
2910
2911 if (ret < 0)
2912 goto re_enumerate;
2913
2914 /* Device might have changed firmware (DFU or similar) */
2915 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2916 || config_descriptors_changed (udev)) {
2917 dev_info(&udev->dev, "device firmware changed\n");
2918 udev->descriptor = descriptor; /* for disconnect() calls */
2919 goto re_enumerate;
2920 }
2921
2922 if (!udev->actconfig)
2923 goto done;
2924
2925 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2926 USB_REQ_SET_CONFIGURATION, 0,
2927 udev->actconfig->desc.bConfigurationValue, 0,
2928 NULL, 0, USB_CTRL_SET_TIMEOUT);
2929 if (ret < 0) {
2930 dev_err(&udev->dev,
2931 "can't restore configuration #%d (error=%d)\n",
2932 udev->actconfig->desc.bConfigurationValue, ret);
2933 goto re_enumerate;
2934 }
2935 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2936
2937 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
2938 struct usb_interface *intf = udev->actconfig->interface[i];
2939 struct usb_interface_descriptor *desc;
2940
2941 /* set_interface resets host side toggle even
2942 * for altsetting zero. the interface may have no driver.
2943 */
2944 desc = &intf->cur_altsetting->desc;
2945 ret = usb_set_interface(udev, desc->bInterfaceNumber,
2946 desc->bAlternateSetting);
2947 if (ret < 0) {
2948 dev_err(&udev->dev, "failed to restore interface %d "
2949 "altsetting %d (error=%d)\n",
2950 desc->bInterfaceNumber,
2951 desc->bAlternateSetting,
2952 ret);
2953 goto re_enumerate;
2954 }
2955 }
2956
2957 done:
2958 return 0;
2959
2960 re_enumerate:
2961 hub_port_logical_disconnect(parent_hub, port1);
2962 return -ENODEV;
2963 }
2964 EXPORT_SYMBOL(usb_reset_device);
2965
2966 /**
2967 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
2968 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2969 * @iface: interface bound to the driver making the request (optional)
2970 *
2971 * Warns all drivers bound to registered interfaces (using their pre_reset
2972 * method), performs the port reset, and then lets the drivers know that
2973 * the reset is over (using their post_reset method).
2974 *
2975 * Return value is the same as for usb_reset_device().
2976 *
2977 * The caller must own the device lock. For example, it's safe to use
2978 * this from a driver probe() routine after downloading new firmware.
2979 * For calls that might not occur during probe(), drivers should lock
2980 * the device using usb_lock_device_for_reset().
2981 *
2982 * The interface locks are acquired during the pre_reset stage and released
2983 * during the post_reset stage. However if iface is not NULL and is
2984 * currently being probed, we assume that the caller already owns its
2985 * lock.
2986 */
2987 int usb_reset_composite_device(struct usb_device *udev,
2988 struct usb_interface *iface)
2989 {
2990 int ret;
2991 struct usb_host_config *config = udev->actconfig;
2992
2993 if (udev->state == USB_STATE_NOTATTACHED ||
2994 udev->state == USB_STATE_SUSPENDED) {
2995 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2996 udev->state);
2997 return -EINVAL;
2998 }
2999
3000 /* Prevent autosuspend during the reset */
3001 usb_autoresume_device(udev, 1);
3002
3003 if (iface && iface->condition != USB_INTERFACE_BINDING)
3004 iface = NULL;
3005
3006 if (config) {
3007 int i;
3008 struct usb_interface *cintf;
3009 struct usb_driver *drv;
3010
3011 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3012 cintf = config->interface[i];
3013 if (cintf != iface)
3014 down(&cintf->dev.sem);
3015 if (device_is_registered(&cintf->dev) &&
3016 cintf->dev.driver) {
3017 drv = to_usb_driver(cintf->dev.driver);
3018 if (drv->pre_reset)
3019 (drv->pre_reset)(cintf);
3020 }
3021 }
3022 }
3023
3024 ret = usb_reset_device(udev);
3025
3026 if (config) {
3027 int i;
3028 struct usb_interface *cintf;
3029 struct usb_driver *drv;
3030
3031 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3032 cintf = config->interface[i];
3033 if (device_is_registered(&cintf->dev) &&
3034 cintf->dev.driver) {
3035 drv = to_usb_driver(cintf->dev.driver);
3036 if (drv->post_reset)
3037 (drv->post_reset)(cintf);
3038 }
3039 if (cintf != iface)
3040 up(&cintf->dev.sem);
3041 }
3042 }
3043
3044 usb_autosuspend_device(udev, 1);
3045 return ret;
3046 }
3047 EXPORT_SYMBOL(usb_reset_composite_device);
CJK support for tty framebuffer vt