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