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Linux v2.6.13
[linux-2.6/next.git] / drivers / usb / core / hub.c
blobc3e46d24a37ed0a93c8f1c2d39c27c30617b4435
1 /*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
11 #include <linux/config.h>
12 #ifdef CONFIG_USB_DEBUG
13 #define DEBUG
14 #else
15 #undef DEBUG
16 #endif
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/completion.h>
22 #include <linux/sched.h>
23 #include <linux/list.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/ioctl.h>
27 #include <linux/usb.h>
28 #include <linux/usbdevice_fs.h>
29 #include <linux/kthread.h>
30
31 #include <asm/semaphore.h>
32 #include <asm/uaccess.h>
33 #include <asm/byteorder.h>
34
35 #include "usb.h"
36 #include "hcd.h"
37 #include "hub.h"
38
39 /* Protect struct usb_device->state and ->children members
40 * Note: Both are also protected by ->serialize, except that ->state can
41 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
42 static DEFINE_SPINLOCK(device_state_lock);
43
44 /* khubd's worklist and its lock */
45 static DEFINE_SPINLOCK(hub_event_lock);
46 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
47
48 /* Wakes up khubd */
49 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
50
51 static struct task_struct *khubd_task;
52
53 /* cycle leds on hubs that aren't blinking for attention */
54 static int blinkenlights = 0;
55 module_param (blinkenlights, bool, S_IRUGO);
56 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
57
58 /*
59 * As of 2.6.10 we introduce a new USB device initialization scheme which
60 * closely resembles the way Windows works. Hopefully it will be compatible
61 * with a wider range of devices than the old scheme. However some previously
62 * working devices may start giving rise to "device not accepting address"
63 * errors; if that happens the user can try the old scheme by adjusting the
64 * following module parameters.
65 *
66 * For maximum flexibility there are two boolean parameters to control the
67 * hub driver's behavior. On the first initialization attempt, if the
68 * "old_scheme_first" parameter is set then the old scheme will be used,
69 * otherwise the new scheme is used. If that fails and "use_both_schemes"
70 * is set, then the driver will make another attempt, using the other scheme.
71 */
72 static int old_scheme_first = 0;
73 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
74 MODULE_PARM_DESC(old_scheme_first,
75 "start with the old device initialization scheme");
76
77 static int use_both_schemes = 1;
78 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
79 MODULE_PARM_DESC(use_both_schemes,
80 "try the other device initialization scheme if the "
81 "first one fails");
82
83
84 #ifdef DEBUG
85 static inline char *portspeed (int portstatus)
86 {
87 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
88 return "480 Mb/s";
89 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
90 return "1.5 Mb/s";
91 else
92 return "12 Mb/s";
93 }
94 #endif
95
96 /* Note that hdev or one of its children must be locked! */
97 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
98 {
99 return usb_get_intfdata(hdev->actconfig->interface[0]);
100 }
101
102 /* USB 2.0 spec Section 11.24.4.5 */
103 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
104 {
105 int i, ret;
106
107 for (i = 0; i < 3; i++) {
108 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
109 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
110 USB_DT_HUB << 8, 0, data, size,
111 USB_CTRL_GET_TIMEOUT);
112 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
113 return ret;
114 }
115 return -EINVAL;
116 }
117
118 /*
119 * USB 2.0 spec Section 11.24.2.1
120 */
121 static int clear_hub_feature(struct usb_device *hdev, int feature)
122 {
123 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
124 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
125 }
126
127 /*
128 * USB 2.0 spec Section 11.24.2.2
129 */
130 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
131 {
132 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
133 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
134 NULL, 0, 1000);
135 }
136
137 /*
138 * USB 2.0 spec Section 11.24.2.13
139 */
140 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
141 {
142 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
143 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
144 NULL, 0, 1000);
145 }
146
147 /*
148 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
149 * for info about using port indicators
150 */
151 static void set_port_led(
152 struct usb_hub *hub,
153 int port1,
154 int selector
155 )
156 {
157 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
158 USB_PORT_FEAT_INDICATOR);
159 if (status < 0)
160 dev_dbg (hub->intfdev,
161 "port %d indicator %s status %d\n",
162 port1,
163 ({ char *s; switch (selector) {
164 case HUB_LED_AMBER: s = "amber"; break;
165 case HUB_LED_GREEN: s = "green"; break;
166 case HUB_LED_OFF: s = "off"; break;
167 case HUB_LED_AUTO: s = "auto"; break;
168 default: s = "??"; break;
169 }; s; }),
170 status);
171 }
172
173 #define LED_CYCLE_PERIOD ((2*HZ)/3)
174
175 static void led_work (void *__hub)
176 {
177 struct usb_hub *hub = __hub;
178 struct usb_device *hdev = hub->hdev;
179 unsigned i;
180 unsigned changed = 0;
181 int cursor = -1;
182
183 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
184 return;
185
186 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
187 unsigned selector, mode;
188
189 /* 30%-50% duty cycle */
190
191 switch (hub->indicator[i]) {
192 /* cycle marker */
193 case INDICATOR_CYCLE:
194 cursor = i;
195 selector = HUB_LED_AUTO;
196 mode = INDICATOR_AUTO;
197 break;
198 /* blinking green = sw attention */
199 case INDICATOR_GREEN_BLINK:
200 selector = HUB_LED_GREEN;
201 mode = INDICATOR_GREEN_BLINK_OFF;
202 break;
203 case INDICATOR_GREEN_BLINK_OFF:
204 selector = HUB_LED_OFF;
205 mode = INDICATOR_GREEN_BLINK;
206 break;
207 /* blinking amber = hw attention */
208 case INDICATOR_AMBER_BLINK:
209 selector = HUB_LED_AMBER;
210 mode = INDICATOR_AMBER_BLINK_OFF;
211 break;
212 case INDICATOR_AMBER_BLINK_OFF:
213 selector = HUB_LED_OFF;
214 mode = INDICATOR_AMBER_BLINK;
215 break;
216 /* blink green/amber = reserved */
217 case INDICATOR_ALT_BLINK:
218 selector = HUB_LED_GREEN;
219 mode = INDICATOR_ALT_BLINK_OFF;
220 break;
221 case INDICATOR_ALT_BLINK_OFF:
222 selector = HUB_LED_AMBER;
223 mode = INDICATOR_ALT_BLINK;
224 break;
225 default:
226 continue;
227 }
228 if (selector != HUB_LED_AUTO)
229 changed = 1;
230 set_port_led(hub, i + 1, selector);
231 hub->indicator[i] = mode;
232 }
233 if (!changed && blinkenlights) {
234 cursor++;
235 cursor %= hub->descriptor->bNbrPorts;
236 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
237 hub->indicator[cursor] = INDICATOR_CYCLE;
238 changed++;
239 }
240 if (changed)
241 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
242 }
243
244 /* use a short timeout for hub/port status fetches */
245 #define USB_STS_TIMEOUT 1000
246 #define USB_STS_RETRIES 5
247
248 /*
249 * USB 2.0 spec Section 11.24.2.6
250 */
251 static int get_hub_status(struct usb_device *hdev,
252 struct usb_hub_status *data)
253 {
254 int i, status = -ETIMEDOUT;
255
256 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
257 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
258 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
259 data, sizeof(*data), USB_STS_TIMEOUT);
260 }
261 return status;
262 }
263
264 /*
265 * USB 2.0 spec Section 11.24.2.7
266 */
267 static int get_port_status(struct usb_device *hdev, int port1,
268 struct usb_port_status *data)
269 {
270 int i, status = -ETIMEDOUT;
271
272 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
273 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
274 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
275 data, sizeof(*data), USB_STS_TIMEOUT);
276 }
277 return status;
278 }
279
280 static void kick_khubd(struct usb_hub *hub)
281 {
282 unsigned long flags;
283
284 spin_lock_irqsave(&hub_event_lock, flags);
285 if (list_empty(&hub->event_list)) {
286 list_add_tail(&hub->event_list, &hub_event_list);
287 wake_up(&khubd_wait);
288 }
289 spin_unlock_irqrestore(&hub_event_lock, flags);
290 }
291
292 void usb_kick_khubd(struct usb_device *hdev)
293 {
294 kick_khubd(hdev_to_hub(hdev));
295 }
296
297
298 /* completion function, fires on port status changes and various faults */
299 static void hub_irq(struct urb *urb, struct pt_regs *regs)
300 {
301 struct usb_hub *hub = (struct usb_hub *)urb->context;
302 int status;
303 int i;
304 unsigned long bits;
305
306 switch (urb->status) {
307 case -ENOENT: /* synchronous unlink */
308 case -ECONNRESET: /* async unlink */
309 case -ESHUTDOWN: /* hardware going away */
310 return;
311
312 default: /* presumably an error */
313 /* Cause a hub reset after 10 consecutive errors */
314 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
315 if ((++hub->nerrors < 10) || hub->error)
316 goto resubmit;
317 hub->error = urb->status;
318 /* FALL THROUGH */
319
320 /* let khubd handle things */
321 case 0: /* we got data: port status changed */
322 bits = 0;
323 for (i = 0; i < urb->actual_length; ++i)
324 bits |= ((unsigned long) ((*hub->buffer)[i]))
325 << (i*8);
326 hub->event_bits[0] = bits;
327 break;
328 }
329
330 hub->nerrors = 0;
331
332 /* Something happened, let khubd figure it out */
333 kick_khubd(hub);
334
335 resubmit:
336 if (hub->quiescing)
337 return;
338
339 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
340 && status != -ENODEV && status != -EPERM)
341 dev_err (hub->intfdev, "resubmit --> %d\n", status);
342 }
343
344 /* USB 2.0 spec Section 11.24.2.3 */
345 static inline int
346 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
347 {
348 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
349 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
350 tt, NULL, 0, 1000);
351 }
352
353 /*
354 * enumeration blocks khubd for a long time. we use keventd instead, since
355 * long blocking there is the exception, not the rule. accordingly, HCDs
356 * talking to TTs must queue control transfers (not just bulk and iso), so
357 * both can talk to the same hub concurrently.
358 */
359 static void hub_tt_kevent (void *arg)
360 {
361 struct usb_hub *hub = arg;
362 unsigned long flags;
363
364 spin_lock_irqsave (&hub->tt.lock, flags);
365 while (!list_empty (&hub->tt.clear_list)) {
366 struct list_head *temp;
367 struct usb_tt_clear *clear;
368 struct usb_device *hdev = hub->hdev;
369 int status;
370
371 temp = hub->tt.clear_list.next;
372 clear = list_entry (temp, struct usb_tt_clear, clear_list);
373 list_del (&clear->clear_list);
374
375 /* drop lock so HCD can concurrently report other TT errors */
376 spin_unlock_irqrestore (&hub->tt.lock, flags);
377 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
378 spin_lock_irqsave (&hub->tt.lock, flags);
379
380 if (status)
381 dev_err (&hdev->dev,
382 "clear tt %d (%04x) error %d\n",
383 clear->tt, clear->devinfo, status);
384 kfree(clear);
385 }
386 spin_unlock_irqrestore (&hub->tt.lock, flags);
387 }
388
389 /**
390 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
391 * @udev: the device whose split transaction failed
392 * @pipe: identifies the endpoint of the failed transaction
393 *
394 * High speed HCDs use this to tell the hub driver that some split control or
395 * bulk transaction failed in a way that requires clearing internal state of
396 * a transaction translator. This is normally detected (and reported) from
397 * interrupt context.
398 *
399 * It may not be possible for that hub to handle additional full (or low)
400 * speed transactions until that state is fully cleared out.
401 */
402 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
403 {
404 struct usb_tt *tt = udev->tt;
405 unsigned long flags;
406 struct usb_tt_clear *clear;
407
408 /* we've got to cope with an arbitrary number of pending TT clears,
409 * since each TT has "at least two" buffers that can need it (and
410 * there can be many TTs per hub). even if they're uncommon.
411 */
412 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
413 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
414 /* FIXME recover somehow ... RESET_TT? */
415 return;
416 }
417
418 /* info that CLEAR_TT_BUFFER needs */
419 clear->tt = tt->multi ? udev->ttport : 1;
420 clear->devinfo = usb_pipeendpoint (pipe);
421 clear->devinfo |= udev->devnum << 4;
422 clear->devinfo |= usb_pipecontrol (pipe)
423 ? (USB_ENDPOINT_XFER_CONTROL << 11)
424 : (USB_ENDPOINT_XFER_BULK << 11);
425 if (usb_pipein (pipe))
426 clear->devinfo |= 1 << 15;
427
428 /* tell keventd to clear state for this TT */
429 spin_lock_irqsave (&tt->lock, flags);
430 list_add_tail (&clear->clear_list, &tt->clear_list);
431 schedule_work (&tt->kevent);
432 spin_unlock_irqrestore (&tt->lock, flags);
433 }
434
435 static void hub_power_on(struct usb_hub *hub)
436 {
437 int port1;
438
439 /* if hub supports power switching, enable power on each port */
440 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
441 dev_dbg(hub->intfdev, "enabling power on all ports\n");
442 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
443 set_port_feature(hub->hdev, port1,
444 USB_PORT_FEAT_POWER);
445 }
446
447 /* Wait for power to be enabled */
448 msleep(hub->descriptor->bPwrOn2PwrGood * 2);
449 }
450
451 static void hub_quiesce(struct usb_hub *hub)
452 {
453 /* stop khubd and related activity */
454 hub->quiescing = 1;
455 usb_kill_urb(hub->urb);
456 if (hub->has_indicators)
457 cancel_delayed_work(&hub->leds);
458 if (hub->has_indicators || hub->tt.hub)
459 flush_scheduled_work();
460 }
461
462 static void hub_activate(struct usb_hub *hub)
463 {
464 int status;
465
466 hub->quiescing = 0;
467 hub->activating = 1;
468 status = usb_submit_urb(hub->urb, GFP_NOIO);
469 if (status < 0)
470 dev_err(hub->intfdev, "activate --> %d\n", status);
471 if (hub->has_indicators && blinkenlights)
472 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
473
474 /* scan all ports ASAP */
475 kick_khubd(hub);
476 }
477
478 static int hub_hub_status(struct usb_hub *hub,
479 u16 *status, u16 *change)
480 {
481 int ret;
482
483 ret = get_hub_status(hub->hdev, &hub->status->hub);
484 if (ret < 0)
485 dev_err (hub->intfdev,
486 "%s failed (err = %d)\n", __FUNCTION__, ret);
487 else {
488 *status = le16_to_cpu(hub->status->hub.wHubStatus);
489 *change = le16_to_cpu(hub->status->hub.wHubChange);
490 ret = 0;
491 }
492 return ret;
493 }
494
495 static int hub_configure(struct usb_hub *hub,
496 struct usb_endpoint_descriptor *endpoint)
497 {
498 struct usb_device *hdev = hub->hdev;
499 struct device *hub_dev = hub->intfdev;
500 u16 hubstatus, hubchange;
501 unsigned int pipe;
502 int maxp, ret;
503 char *message;
504
505 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
506 &hub->buffer_dma);
507 if (!hub->buffer) {
508 message = "can't allocate hub irq buffer";
509 ret = -ENOMEM;
510 goto fail;
511 }
512
513 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
514 if (!hub->status) {
515 message = "can't kmalloc hub status buffer";
516 ret = -ENOMEM;
517 goto fail;
518 }
519
520 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
521 if (!hub->descriptor) {
522 message = "can't kmalloc hub descriptor";
523 ret = -ENOMEM;
524 goto fail;
525 }
526
527 /* Request the entire hub descriptor.
528 * hub->descriptor can handle USB_MAXCHILDREN ports,
529 * but the hub can/will return fewer bytes here.
530 */
531 ret = get_hub_descriptor(hdev, hub->descriptor,
532 sizeof(*hub->descriptor));
533 if (ret < 0) {
534 message = "can't read hub descriptor";
535 goto fail;
536 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
537 message = "hub has too many ports!";
538 ret = -ENODEV;
539 goto fail;
540 }
541
542 hdev->maxchild = hub->descriptor->bNbrPorts;
543 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
544 (hdev->maxchild == 1) ? "" : "s");
545
546 le16_to_cpus(&hub->descriptor->wHubCharacteristics);
547
548 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
549 int i;
550 char portstr [USB_MAXCHILDREN + 1];
551
552 for (i = 0; i < hdev->maxchild; i++)
553 portstr[i] = hub->descriptor->DeviceRemovable
554 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
555 ? 'F' : 'R';
556 portstr[hdev->maxchild] = 0;
557 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
558 } else
559 dev_dbg(hub_dev, "standalone hub\n");
560
561 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
562 case 0x00:
563 dev_dbg(hub_dev, "ganged power switching\n");
564 break;
565 case 0x01:
566 dev_dbg(hub_dev, "individual port power switching\n");
567 break;
568 case 0x02:
569 case 0x03:
570 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
571 break;
572 }
573
574 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
575 case 0x00:
576 dev_dbg(hub_dev, "global over-current protection\n");
577 break;
578 case 0x08:
579 dev_dbg(hub_dev, "individual port over-current protection\n");
580 break;
581 case 0x10:
582 case 0x18:
583 dev_dbg(hub_dev, "no over-current protection\n");
584 break;
585 }
586
587 spin_lock_init (&hub->tt.lock);
588 INIT_LIST_HEAD (&hub->tt.clear_list);
589 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
590 switch (hdev->descriptor.bDeviceProtocol) {
591 case 0:
592 break;
593 case 1:
594 dev_dbg(hub_dev, "Single TT\n");
595 hub->tt.hub = hdev;
596 break;
597 case 2:
598 ret = usb_set_interface(hdev, 0, 1);
599 if (ret == 0) {
600 dev_dbg(hub_dev, "TT per port\n");
601 hub->tt.multi = 1;
602 } else
603 dev_err(hub_dev, "Using single TT (err %d)\n",
604 ret);
605 hub->tt.hub = hdev;
606 break;
607 default:
608 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
609 hdev->descriptor.bDeviceProtocol);
610 break;
611 }
612
613 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
614 case 0x00:
615 if (hdev->descriptor.bDeviceProtocol != 0)
616 dev_dbg(hub_dev, "TT requires at most 8 FS bit times\n");
617 break;
618 case 0x20:
619 dev_dbg(hub_dev, "TT requires at most 16 FS bit times\n");
620 break;
621 case 0x40:
622 dev_dbg(hub_dev, "TT requires at most 24 FS bit times\n");
623 break;
624 case 0x60:
625 dev_dbg(hub_dev, "TT requires at most 32 FS bit times\n");
626 break;
627 }
628
629 /* probe() zeroes hub->indicator[] */
630 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) {
631 hub->has_indicators = 1;
632 dev_dbg(hub_dev, "Port indicators are supported\n");
633 }
634
635 dev_dbg(hub_dev, "power on to power good time: %dms\n",
636 hub->descriptor->bPwrOn2PwrGood * 2);
637
638 /* power budgeting mostly matters with bus-powered hubs,
639 * and battery-powered root hubs (may provide just 8 mA).
640 */
641 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
642 if (ret < 0) {
643 message = "can't get hub status";
644 goto fail;
645 }
646 le16_to_cpus(&hubstatus);
647 if (hdev == hdev->bus->root_hub) {
648 struct usb_hcd *hcd =
649 container_of(hdev->bus, struct usb_hcd, self);
650
651 hub->power_budget = min(500u, hcd->power_budget) / 2;
652 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
653 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
654 hub->descriptor->bHubContrCurrent);
655 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
656 / 2;
657 }
658 if (hub->power_budget)
659 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
660 hub->power_budget * 2);
661
662
663 ret = hub_hub_status(hub, &hubstatus, &hubchange);
664 if (ret < 0) {
665 message = "can't get hub status";
666 goto fail;
667 }
668
669 /* local power status reports aren't always correct */
670 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
671 dev_dbg(hub_dev, "local power source is %s\n",
672 (hubstatus & HUB_STATUS_LOCAL_POWER)
673 ? "lost (inactive)" : "good");
674
675 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
676 dev_dbg(hub_dev, "%sover-current condition exists\n",
677 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
678
679 /* set up the interrupt endpoint */
680 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
681 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
682
683 if (maxp > sizeof(*hub->buffer))
684 maxp = sizeof(*hub->buffer);
685
686 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
687 if (!hub->urb) {
688 message = "couldn't allocate interrupt urb";
689 ret = -ENOMEM;
690 goto fail;
691 }
692
693 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
694 hub, endpoint->bInterval);
695 hub->urb->transfer_dma = hub->buffer_dma;
696 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
697
698 /* maybe cycle the hub leds */
699 if (hub->has_indicators && blinkenlights)
700 hub->indicator [0] = INDICATOR_CYCLE;
701
702 hub_power_on(hub);
703 hub_activate(hub);
704 return 0;
705
706 fail:
707 dev_err (hub_dev, "config failed, %s (err %d)\n",
708 message, ret);
709 /* hub_disconnect() frees urb and descriptor */
710 return ret;
711 }
712
713 static unsigned highspeed_hubs;
714
715 static void hub_disconnect(struct usb_interface *intf)
716 {
717 struct usb_hub *hub = usb_get_intfdata (intf);
718 struct usb_device *hdev;
719
720 if (!hub)
721 return;
722 hdev = hub->hdev;
723
724 if (hdev->speed == USB_SPEED_HIGH)
725 highspeed_hubs--;
726
727 usb_set_intfdata (intf, NULL);
728
729 hub_quiesce(hub);
730 usb_free_urb(hub->urb);
731 hub->urb = NULL;
732
733 spin_lock_irq(&hub_event_lock);
734 list_del_init(&hub->event_list);
735 spin_unlock_irq(&hub_event_lock);
736
737 kfree(hub->descriptor);
738 hub->descriptor = NULL;
739
740 kfree(hub->status);
741 hub->status = NULL;
742
743 if (hub->buffer) {
744 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
745 hub->buffer_dma);
746 hub->buffer = NULL;
747 }
748
749 /* Free the memory */
750 kfree(hub);
751 }
752
753 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
754 {
755 struct usb_host_interface *desc;
756 struct usb_endpoint_descriptor *endpoint;
757 struct usb_device *hdev;
758 struct usb_hub *hub;
759
760 desc = intf->cur_altsetting;
761 hdev = interface_to_usbdev(intf);
762
763 /* Some hubs have a subclass of 1, which AFAICT according to the */
764 /* specs is not defined, but it works */
765 if ((desc->desc.bInterfaceSubClass != 0) &&
766 (desc->desc.bInterfaceSubClass != 1)) {
767 descriptor_error:
768 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
769 return -EIO;
770 }
771
772 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
773 if (desc->desc.bNumEndpoints != 1)
774 goto descriptor_error;
775
776 endpoint = &desc->endpoint[0].desc;
777
778 /* Output endpoint? Curiouser and curiouser.. */
779 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
780 goto descriptor_error;
781
782 /* If it's not an interrupt endpoint, we'd better punt! */
783 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
784 != USB_ENDPOINT_XFER_INT)
785 goto descriptor_error;
786
787 /* We found a hub */
788 dev_info (&intf->dev, "USB hub found\n");
789
790 hub = kmalloc(sizeof(*hub), GFP_KERNEL);
791 if (!hub) {
792 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
793 return -ENOMEM;
794 }
795
796 memset(hub, 0, sizeof(*hub));
797
798 INIT_LIST_HEAD(&hub->event_list);
799 hub->intfdev = &intf->dev;
800 hub->hdev = hdev;
801 INIT_WORK(&hub->leds, led_work, hub);
802
803 usb_set_intfdata (intf, hub);
804
805 if (hdev->speed == USB_SPEED_HIGH)
806 highspeed_hubs++;
807
808 if (hub_configure(hub, endpoint) >= 0)
809 return 0;
810
811 hub_disconnect (intf);
812 return -ENODEV;
813 }
814
815 static int
816 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
817 {
818 struct usb_device *hdev = interface_to_usbdev (intf);
819
820 /* assert ifno == 0 (part of hub spec) */
821 switch (code) {
822 case USBDEVFS_HUB_PORTINFO: {
823 struct usbdevfs_hub_portinfo *info = user_data;
824 int i;
825
826 spin_lock_irq(&device_state_lock);
827 if (hdev->devnum <= 0)
828 info->nports = 0;
829 else {
830 info->nports = hdev->maxchild;
831 for (i = 0; i < info->nports; i++) {
832 if (hdev->children[i] == NULL)
833 info->port[i] = 0;
834 else
835 info->port[i] =
836 hdev->children[i]->devnum;
837 }
838 }
839 spin_unlock_irq(&device_state_lock);
840
841 return info->nports + 1;
842 }
843
844 default:
845 return -ENOSYS;
846 }
847 }
848
849 /* caller has locked the hub device */
850 static void hub_pre_reset(struct usb_hub *hub)
851 {
852 struct usb_device *hdev = hub->hdev;
853 int i;
854
855 for (i = 0; i < hdev->maxchild; ++i) {
856 if (hdev->children[i])
857 usb_disconnect(&hdev->children[i]);
858 }
859 hub_quiesce(hub);
860 }
861
862 /* caller has locked the hub device */
863 static void hub_post_reset(struct usb_hub *hub)
864 {
865 hub_activate(hub);
866 hub_power_on(hub);
867 }
868
869
870 /* grab device/port lock, returning index of that port (zero based).
871 * protects the upstream link used by this device from concurrent
872 * tree operations like suspend, resume, reset, and disconnect, which
873 * apply to everything downstream of a given port.
874 */
875 static int locktree(struct usb_device *udev)
876 {
877 int t;
878 struct usb_device *hdev;
879
880 if (!udev)
881 return -ENODEV;
882
883 /* root hub is always the first lock in the series */
884 hdev = udev->parent;
885 if (!hdev) {
886 usb_lock_device(udev);
887 return 0;
888 }
889
890 /* on the path from root to us, lock everything from
891 * top down, dropping parent locks when not needed
892 */
893 t = locktree(hdev);
894 if (t < 0)
895 return t;
896 for (t = 0; t < hdev->maxchild; t++) {
897 if (hdev->children[t] == udev) {
898 /* everything is fail-fast once disconnect
899 * processing starts
900 */
901 if (udev->state == USB_STATE_NOTATTACHED)
902 break;
903
904 /* when everyone grabs locks top->bottom,
905 * non-overlapping work may be concurrent
906 */
907 down(&udev->serialize);
908 up(&hdev->serialize);
909 return t + 1;
910 }
911 }
912 usb_unlock_device(hdev);
913 return -ENODEV;
914 }
915
916 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
917 {
918 int i;
919
920 for (i = 0; i < udev->maxchild; ++i) {
921 if (udev->children[i])
922 recursively_mark_NOTATTACHED(udev->children[i]);
923 }
924 udev->state = USB_STATE_NOTATTACHED;
925 }
926
927 /**
928 * usb_set_device_state - change a device's current state (usbcore, hcds)
929 * @udev: pointer to device whose state should be changed
930 * @new_state: new state value to be stored
931 *
932 * udev->state is _not_ fully protected by the device lock. Although
933 * most transitions are made only while holding the lock, the state can
934 * can change to USB_STATE_NOTATTACHED at almost any time. This
935 * is so that devices can be marked as disconnected as soon as possible,
936 * without having to wait for any semaphores to be released. As a result,
937 * all changes to any device's state must be protected by the
938 * device_state_lock spinlock.
939 *
940 * Once a device has been added to the device tree, all changes to its state
941 * should be made using this routine. The state should _not_ be set directly.
942 *
943 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
944 * Otherwise udev->state is set to new_state, and if new_state is
945 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
946 * to USB_STATE_NOTATTACHED.
947 */
948 void usb_set_device_state(struct usb_device *udev,
949 enum usb_device_state new_state)
950 {
951 unsigned long flags;
952
953 spin_lock_irqsave(&device_state_lock, flags);
954 if (udev->state == USB_STATE_NOTATTACHED)
955 ; /* do nothing */
956 else if (new_state != USB_STATE_NOTATTACHED)
957 udev->state = new_state;
958 else
959 recursively_mark_NOTATTACHED(udev);
960 spin_unlock_irqrestore(&device_state_lock, flags);
961 }
962 EXPORT_SYMBOL(usb_set_device_state);
963
964
965 static void choose_address(struct usb_device *udev)
966 {
967 int devnum;
968 struct usb_bus *bus = udev->bus;
969
970 /* If khubd ever becomes multithreaded, this will need a lock */
971
972 /* Try to allocate the next devnum beginning at bus->devnum_next. */
973 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
974 bus->devnum_next);
975 if (devnum >= 128)
976 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
977
978 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
979
980 if (devnum < 128) {
981 set_bit(devnum, bus->devmap.devicemap);
982 udev->devnum = devnum;
983 }
984 }
985
986 static void release_address(struct usb_device *udev)
987 {
988 if (udev->devnum > 0) {
989 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
990 udev->devnum = -1;
991 }
992 }
993
994 /**
995 * usb_disconnect - disconnect a device (usbcore-internal)
996 * @pdev: pointer to device being disconnected
997 * Context: !in_interrupt ()
998 *
999 * Something got disconnected. Get rid of it and all of its children.
1000 *
1001 * If *pdev is a normal device then the parent hub must already be locked.
1002 * If *pdev is a root hub then this routine will acquire the
1003 * usb_bus_list_lock on behalf of the caller.
1004 *
1005 * Only hub drivers (including virtual root hub drivers for host
1006 * controllers) should ever call this.
1007 *
1008 * This call is synchronous, and may not be used in an interrupt context.
1009 */
1010 void usb_disconnect(struct usb_device **pdev)
1011 {
1012 struct usb_device *udev = *pdev;
1013 int i;
1014
1015 if (!udev) {
1016 pr_debug ("%s nodev\n", __FUNCTION__);
1017 return;
1018 }
1019
1020 /* mark the device as inactive, so any further urb submissions for
1021 * this device (and any of its children) will fail immediately.
1022 * this quiesces everyting except pending urbs.
1023 */
1024 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1025
1026 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1027 if (!udev->parent) {
1028 down(&usb_bus_list_lock);
1029 usb_lock_device(udev);
1030 } else
1031 down(&udev->serialize);
1032
1033 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1034
1035 /* Free up all the children before we remove this device */
1036 for (i = 0; i < USB_MAXCHILDREN; i++) {
1037 if (udev->children[i])
1038 usb_disconnect(&udev->children[i]);
1039 }
1040
1041 /* deallocate hcd/hardware state ... nuking all pending urbs and
1042 * cleaning up all state associated with the current configuration
1043 * so that the hardware is now fully quiesced.
1044 */
1045 usb_disable_device(udev, 0);
1046
1047 /* Free the device number, remove the /proc/bus/usb entry and
1048 * the sysfs attributes, and delete the parent's children[]
1049 * (or root_hub) pointer.
1050 */
1051 dev_dbg (&udev->dev, "unregistering device\n");
1052 release_address(udev);
1053 usbfs_remove_device(udev);
1054 usb_remove_sysfs_dev_files(udev);
1055
1056 /* Avoid races with recursively_mark_NOTATTACHED() */
1057 spin_lock_irq(&device_state_lock);
1058 *pdev = NULL;
1059 spin_unlock_irq(&device_state_lock);
1060
1061 if (!udev->parent) {
1062 usb_unlock_device(udev);
1063 up(&usb_bus_list_lock);
1064 } else
1065 up(&udev->serialize);
1066
1067 device_unregister(&udev->dev);
1068 }
1069
1070 static int choose_configuration(struct usb_device *udev)
1071 {
1072 int c, i;
1073
1074 /* NOTE: this should interact with hub power budgeting */
1075
1076 c = udev->config[0].desc.bConfigurationValue;
1077 if (udev->descriptor.bNumConfigurations != 1) {
1078 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1079 struct usb_interface_descriptor *desc;
1080
1081 /* heuristic: Linux is more likely to have class
1082 * drivers, so avoid vendor-specific interfaces.
1083 */
1084 desc = &udev->config[i].intf_cache[0]
1085 ->altsetting->desc;
1086 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1087 continue;
1088 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1089 * MSFT needs this to be the first config; never use
1090 * it as the default unless Linux has host-side RNDIS.
1091 * A second config would ideally be CDC-Ethernet, but
1092 * may instead be the "vendor specific" CDC subset
1093 * long used by ARM Linux for sa1100 or pxa255.
1094 */
1095 if (desc->bInterfaceClass == USB_CLASS_COMM
1096 && desc->bInterfaceSubClass == 2
1097 && desc->bInterfaceProtocol == 0xff) {
1098 c = udev->config[1].desc.bConfigurationValue;
1099 continue;
1100 }
1101 c = udev->config[i].desc.bConfigurationValue;
1102 break;
1103 }
1104 dev_info(&udev->dev,
1105 "configuration #%d chosen from %d choices\n",
1106 c, udev->descriptor.bNumConfigurations);
1107 }
1108 return c;
1109 }
1110
1111 #ifdef DEBUG
1112 static void show_string(struct usb_device *udev, char *id, char *string)
1113 {
1114 if (!string)
1115 return;
1116 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1117 }
1118
1119 #else
1120 static inline void show_string(struct usb_device *udev, char *id, char *string)
1121 {}
1122 #endif
1123
1124 static void get_string(struct usb_device *udev, char **string, int index)
1125 {
1126 char *buf;
1127
1128 if (!index)
1129 return;
1130 buf = kmalloc(256, GFP_KERNEL);
1131 if (!buf)
1132 return;
1133 if (usb_string(udev, index, buf, 256) > 0)
1134 *string = buf;
1135 else
1136 kfree(buf);
1137 }
1138
1139
1140 #ifdef CONFIG_USB_OTG
1141 #include "otg_whitelist.h"
1142 #endif
1143
1144 /**
1145 * usb_new_device - perform initial device setup (usbcore-internal)
1146 * @udev: newly addressed device (in ADDRESS state)
1147 *
1148 * This is called with devices which have been enumerated, but not yet
1149 * configured. The device descriptor is available, but not descriptors
1150 * for any device configuration. The caller must have locked udev and
1151 * either the parent hub (if udev is a normal device) or else the
1152 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1153 * udev has already been installed, but udev is not yet visible through
1154 * sysfs or other filesystem code.
1155 *
1156 * Returns 0 for success (device is configured and listed, with its
1157 * interfaces, in sysfs); else a negative errno value.
1158 *
1159 * This call is synchronous, and may not be used in an interrupt context.
1160 *
1161 * Only the hub driver should ever call this; root hub registration
1162 * uses it indirectly.
1163 */
1164 int usb_new_device(struct usb_device *udev)
1165 {
1166 int err;
1167 int c;
1168
1169 err = usb_get_configuration(udev);
1170 if (err < 0) {
1171 dev_err(&udev->dev, "can't read configurations, error %d\n",
1172 err);
1173 goto fail;
1174 }
1175
1176 /* read the standard strings and cache them if present */
1177 get_string(udev, &udev->product, udev->descriptor.iProduct);
1178 get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);
1179 get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);
1180
1181 /* Tell the world! */
1182 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1183 "SerialNumber=%d\n",
1184 udev->descriptor.iManufacturer,
1185 udev->descriptor.iProduct,
1186 udev->descriptor.iSerialNumber);
1187 show_string(udev, "Product", udev->product);
1188 show_string(udev, "Manufacturer", udev->manufacturer);
1189 show_string(udev, "SerialNumber", udev->serial);
1190
1191 #ifdef CONFIG_USB_OTG
1192 /*
1193 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1194 * to wake us after we've powered off VBUS; and HNP, switching roles
1195 * "host" to "peripheral". The OTG descriptor helps figure this out.
1196 */
1197 if (!udev->bus->is_b_host
1198 && udev->config
1199 && udev->parent == udev->bus->root_hub) {
1200 struct usb_otg_descriptor *desc = 0;
1201 struct usb_bus *bus = udev->bus;
1202
1203 /* descriptor may appear anywhere in config */
1204 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1205 le16_to_cpu(udev->config[0].desc.wTotalLength),
1206 USB_DT_OTG, (void **) &desc) == 0) {
1207 if (desc->bmAttributes & USB_OTG_HNP) {
1208 unsigned port1;
1209 struct usb_device *root = udev->parent;
1210
1211 for (port1 = 1; port1 <= root->maxchild;
1212 port1++) {
1213 if (root->children[port1-1] == udev)
1214 break;
1215 }
1216
1217 dev_info(&udev->dev,
1218 "Dual-Role OTG device on %sHNP port\n",
1219 (port1 == bus->otg_port)
1220 ? "" : "non-");
1221
1222 /* enable HNP before suspend, it's simpler */
1223 if (port1 == bus->otg_port)
1224 bus->b_hnp_enable = 1;
1225 err = usb_control_msg(udev,
1226 usb_sndctrlpipe(udev, 0),
1227 USB_REQ_SET_FEATURE, 0,
1228 bus->b_hnp_enable
1229 ? USB_DEVICE_B_HNP_ENABLE
1230 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1231 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1232 if (err < 0) {
1233 /* OTG MESSAGE: report errors here,
1234 * customize to match your product.
1235 */
1236 dev_info(&udev->dev,
1237 "can't set HNP mode; %d\n",
1238 err);
1239 bus->b_hnp_enable = 0;
1240 }
1241 }
1242 }
1243 }
1244
1245 if (!is_targeted(udev)) {
1246
1247 /* Maybe it can talk to us, though we can't talk to it.
1248 * (Includes HNP test device.)
1249 */
1250 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1251 static int __usb_suspend_device (struct usb_device *,
1252 int port1, pm_message_t state);
1253 err = __usb_suspend_device(udev,
1254 udev->bus->otg_port,
1255 PMSG_SUSPEND);
1256 if (err < 0)
1257 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1258 }
1259 err = -ENODEV;
1260 goto fail;
1261 }
1262 #endif
1263
1264 /* put device-specific files into sysfs */
1265 err = device_add (&udev->dev);
1266 if (err) {
1267 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1268 goto fail;
1269 }
1270 usb_create_sysfs_dev_files (udev);
1271
1272 /* choose and set the configuration. that registers the interfaces
1273 * with the driver core, and lets usb device drivers bind to them.
1274 */
1275 c = choose_configuration(udev);
1276 if (c < 0)
1277 dev_warn(&udev->dev,
1278 "can't choose an initial configuration\n");
1279 else {
1280 err = usb_set_configuration(udev, c);
1281 if (err) {
1282 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1283 c, err);
1284 usb_remove_sysfs_dev_files(udev);
1285 device_del(&udev->dev);
1286 goto fail;
1287 }
1288 }
1289
1290 /* USB device state == configured ... usable */
1291
1292 /* add a /proc/bus/usb entry */
1293 usbfs_add_device(udev);
1294 return 0;
1295
1296 fail:
1297 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1298 return err;
1299 }
1300
1301
1302 static int hub_port_status(struct usb_hub *hub, int port1,
1303 u16 *status, u16 *change)
1304 {
1305 int ret;
1306
1307 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1308 if (ret < 0)
1309 dev_err (hub->intfdev,
1310 "%s failed (err = %d)\n", __FUNCTION__, ret);
1311 else {
1312 *status = le16_to_cpu(hub->status->port.wPortStatus);
1313 *change = le16_to_cpu(hub->status->port.wPortChange);
1314 ret = 0;
1315 }
1316 return ret;
1317 }
1318
1319 #define PORT_RESET_TRIES 5
1320 #define SET_ADDRESS_TRIES 2
1321 #define GET_DESCRIPTOR_TRIES 2
1322 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1323 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1324
1325 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1326 #define HUB_SHORT_RESET_TIME 10
1327 #define HUB_LONG_RESET_TIME 200
1328 #define HUB_RESET_TIMEOUT 500
1329
1330 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1331 struct usb_device *udev, unsigned int delay)
1332 {
1333 int delay_time, ret;
1334 u16 portstatus;
1335 u16 portchange;
1336
1337 for (delay_time = 0;
1338 delay_time < HUB_RESET_TIMEOUT;
1339 delay_time += delay) {
1340 /* wait to give the device a chance to reset */
1341 msleep(delay);
1342
1343 /* read and decode port status */
1344 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1345 if (ret < 0)
1346 return ret;
1347
1348 /* Device went away? */
1349 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1350 return -ENOTCONN;
1351
1352 /* bomb out completely if something weird happened */
1353 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1354 return -EINVAL;
1355
1356 /* if we`ve finished resetting, then break out of the loop */
1357 if (!(portstatus & USB_PORT_STAT_RESET) &&
1358 (portstatus & USB_PORT_STAT_ENABLE)) {
1359 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1360 udev->speed = USB_SPEED_HIGH;
1361 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1362 udev->speed = USB_SPEED_LOW;
1363 else
1364 udev->speed = USB_SPEED_FULL;
1365 return 0;
1366 }
1367
1368 /* switch to the long delay after two short delay failures */
1369 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1370 delay = HUB_LONG_RESET_TIME;
1371
1372 dev_dbg (hub->intfdev,
1373 "port %d not reset yet, waiting %dms\n",
1374 port1, delay);
1375 }
1376
1377 return -EBUSY;
1378 }
1379
1380 static int hub_port_reset(struct usb_hub *hub, int port1,
1381 struct usb_device *udev, unsigned int delay)
1382 {
1383 int i, status;
1384
1385 /* Reset the port */
1386 for (i = 0; i < PORT_RESET_TRIES; i++) {
1387 status = set_port_feature(hub->hdev,
1388 port1, USB_PORT_FEAT_RESET);
1389 if (status)
1390 dev_err(hub->intfdev,
1391 "cannot reset port %d (err = %d)\n",
1392 port1, status);
1393 else {
1394 status = hub_port_wait_reset(hub, port1, udev, delay);
1395 if (status)
1396 dev_dbg(hub->intfdev,
1397 "port_wait_reset: err = %d\n",
1398 status);
1399 }
1400
1401 /* return on disconnect or reset */
1402 switch (status) {
1403 case 0:
1404 /* TRSTRCY = 10 ms */
1405 msleep(10);
1406 /* FALL THROUGH */
1407 case -ENOTCONN:
1408 case -ENODEV:
1409 clear_port_feature(hub->hdev,
1410 port1, USB_PORT_FEAT_C_RESET);
1411 /* FIXME need disconnect() for NOTATTACHED device */
1412 usb_set_device_state(udev, status
1413 ? USB_STATE_NOTATTACHED
1414 : USB_STATE_DEFAULT);
1415 return status;
1416 }
1417
1418 dev_dbg (hub->intfdev,
1419 "port %d not enabled, trying reset again...\n",
1420 port1);
1421 delay = HUB_LONG_RESET_TIME;
1422 }
1423
1424 dev_err (hub->intfdev,
1425 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1426 port1);
1427
1428 return status;
1429 }
1430
1431 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
1432 {
1433 struct usb_device *hdev = hub->hdev;
1434 int ret;
1435
1436 if (hdev->children[port1-1] && set_state) {
1437 usb_set_device_state(hdev->children[port1-1],
1438 USB_STATE_NOTATTACHED);
1439 }
1440 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
1441 if (ret)
1442 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
1443 port1, ret);
1444
1445 return ret;
1446 }
1447
1448 /*
1449 * Disable a port and mark a logical connnect-change event, so that some
1450 * time later khubd will disconnect() any existing usb_device on the port
1451 * and will re-enumerate if there actually is a device attached.
1452 */
1453 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1454 {
1455 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1456 hub_port_disable(hub, port1, 1);
1457
1458 /* FIXME let caller ask to power down the port:
1459 * - some devices won't enumerate without a VBUS power cycle
1460 * - SRP saves power that way
1461 * - usb_suspend_device(dev, PMSG_SUSPEND)
1462 * That's easy if this hub can switch power per-port, and
1463 * khubd reactivates the port later (timer, SRP, etc).
1464 * Powerdown must be optional, because of reset/DFU.
1465 */
1466
1467 set_bit(port1, hub->change_bits);
1468 kick_khubd(hub);
1469 }
1470
1471
1472 #ifdef CONFIG_USB_SUSPEND
1473
1474 /*
1475 * Selective port suspend reduces power; most suspended devices draw
1476 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1477 * All devices below the suspended port are also suspended.
1478 *
1479 * Devices leave suspend state when the host wakes them up. Some devices
1480 * also support "remote wakeup", where the device can activate the USB
1481 * tree above them to deliver data, such as a keypress or packet. In
1482 * some cases, this wakes the USB host.
1483 */
1484 static int hub_port_suspend(struct usb_hub *hub, int port1,
1485 struct usb_device *udev)
1486 {
1487 int status;
1488
1489 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1490
1491 /* enable remote wakeup when appropriate; this lets the device
1492 * wake up the upstream hub (including maybe the root hub).
1493 *
1494 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1495 * we don't explicitly enable it here.
1496 */
1497 if (udev->actconfig
1498 // && FIXME (remote wakeup enabled on this bus)
1499 // ... currently assuming it's always appropriate
1500 && (udev->actconfig->desc.bmAttributes
1501 & USB_CONFIG_ATT_WAKEUP) != 0) {
1502 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1503 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1504 USB_DEVICE_REMOTE_WAKEUP, 0,
1505 NULL, 0,
1506 USB_CTRL_SET_TIMEOUT);
1507 if (status)
1508 dev_dbg(&udev->dev,
1509 "won't remote wakeup, status %d\n",
1510 status);
1511 }
1512
1513 /* see 7.1.7.6 */
1514 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1515 if (status) {
1516 dev_dbg(hub->intfdev,
1517 "can't suspend port %d, status %d\n",
1518 port1, status);
1519 /* paranoia: "should not happen" */
1520 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1521 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1522 USB_DEVICE_REMOTE_WAKEUP, 0,
1523 NULL, 0,
1524 USB_CTRL_SET_TIMEOUT);
1525 } else {
1526 /* device has up to 10 msec to fully suspend */
1527 dev_dbg(&udev->dev, "usb suspend\n");
1528 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1529 msleep(10);
1530 }
1531 return status;
1532 }
1533
1534 /*
1535 * Devices on USB hub ports have only one "suspend" state, corresponding
1536 * to ACPI D2, "may cause the device to lose some context".
1537 * State transitions include:
1538 *
1539 * - suspend, resume ... when the VBUS power link stays live
1540 * - suspend, disconnect ... VBUS lost
1541 *
1542 * Once VBUS drop breaks the circuit, the port it's using has to go through
1543 * normal re-enumeration procedures, starting with enabling VBUS power.
1544 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1545 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1546 * timer, no SRP, no requests through sysfs.
1547 */
1548 static int __usb_suspend_device (struct usb_device *udev, int port1,
1549 pm_message_t state)
1550 {
1551 int status;
1552
1553 /* caller owns the udev device lock */
1554 if (port1 < 0)
1555 return port1;
1556
1557 if (udev->state == USB_STATE_SUSPENDED
1558 || udev->state == USB_STATE_NOTATTACHED) {
1559 return 0;
1560 }
1561
1562 /* suspend interface drivers; if this is a hub, it
1563 * suspends the child devices
1564 */
1565 if (udev->actconfig) {
1566 int i;
1567
1568 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1569 struct usb_interface *intf;
1570 struct usb_driver *driver;
1571
1572 intf = udev->actconfig->interface[i];
1573 if (state <= intf->dev.power.power_state)
1574 continue;
1575 if (!intf->dev.driver)
1576 continue;
1577 driver = to_usb_driver(intf->dev.driver);
1578
1579 if (driver->suspend) {
1580 status = driver->suspend(intf, state);
1581 if (intf->dev.power.power_state != state
1582 || status)
1583 dev_err(&intf->dev,
1584 "suspend %d fail, code %d\n",
1585 state, status);
1586 }
1587
1588 /* only drivers with suspend() can ever resume();
1589 * and after power loss, even they won't.
1590 * bus_rescan_devices() can rebind drivers later.
1591 *
1592 * FIXME the PM core self-deadlocks when unbinding
1593 * drivers during suspend/resume ... everything grabs
1594 * dpm_sem (not a spinlock, ugh). we want to unbind,
1595 * since we know every driver's probe/disconnect works
1596 * even for drivers that can't suspend.
1597 */
1598 if (!driver->suspend || state > PM_SUSPEND_MEM) {
1599 #if 1
1600 dev_warn(&intf->dev, "resume is unsafe!\n");
1601 #else
1602 down_write(&usb_bus_type.rwsem);
1603 device_release_driver(&intf->dev);
1604 up_write(&usb_bus_type.rwsem);
1605 #endif
1606 }
1607 }
1608 }
1609
1610 /*
1611 * FIXME this needs port power off call paths too, to help force
1612 * USB into the "generic" PM model. At least for devices on
1613 * ports that aren't using ganged switching (usually root hubs).
1614 *
1615 * NOTE: SRP-capable links should adopt more aggressive poweroff
1616 * policies (when HNP doesn't apply) once we have mechanisms to
1617 * turn power back on! (Likely not before 2.7...)
1618 */
1619 if (state > PM_SUSPEND_MEM) {
1620 dev_warn(&udev->dev, "no poweroff yet, suspending instead\n");
1621 }
1622
1623 /* "global suspend" of the HC-to-USB interface (root hub), or
1624 * "selective suspend" of just one hub-device link.
1625 */
1626 if (!udev->parent) {
1627 struct usb_bus *bus = udev->bus;
1628 if (bus && bus->op->hub_suspend) {
1629 status = bus->op->hub_suspend (bus);
1630 if (status == 0) {
1631 dev_dbg(&udev->dev, "usb suspend\n");
1632 usb_set_device_state(udev,
1633 USB_STATE_SUSPENDED);
1634 }
1635 } else
1636 status = -EOPNOTSUPP;
1637 } else
1638 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1639 udev);
1640
1641 if (status == 0)
1642 udev->dev.power.power_state = state;
1643 return status;
1644 }
1645
1646 /**
1647 * usb_suspend_device - suspend a usb device
1648 * @udev: device that's no longer in active use
1649 * @state: PMSG_SUSPEND to suspend
1650 * Context: must be able to sleep; device not locked
1651 *
1652 * Suspends a USB device that isn't in active use, conserving power.
1653 * Devices may wake out of a suspend, if anything important happens,
1654 * using the remote wakeup mechanism. They may also be taken out of
1655 * suspend by the host, using usb_resume_device(). It's also routine
1656 * to disconnect devices while they are suspended.
1657 *
1658 * Suspending OTG devices may trigger HNP, if that's been enabled
1659 * between a pair of dual-role devices. That will change roles, such
1660 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1661 *
1662 * Returns 0 on success, else negative errno.
1663 */
1664 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1665 {
1666 int port1, status;
1667
1668 port1 = locktree(udev);
1669 if (port1 < 0)
1670 return port1;
1671
1672 status = __usb_suspend_device(udev, port1, state);
1673 usb_unlock_device(udev);
1674 return status;
1675 }
1676
1677 /*
1678 * hardware resume signaling is finished, either because of selective
1679 * resume (by host) or remote wakeup (by device) ... now see what changed
1680 * in the tree that's rooted at this device.
1681 */
1682 static int finish_port_resume(struct usb_device *udev)
1683 {
1684 int status;
1685 u16 devstatus;
1686
1687 /* caller owns the udev device lock */
1688 dev_dbg(&udev->dev, "usb resume\n");
1689
1690 /* usb ch9 identifies four variants of SUSPENDED, based on what
1691 * state the device resumes to. Linux currently won't see the
1692 * first two on the host side; they'd be inside hub_port_init()
1693 * during many timeouts, but khubd can't suspend until later.
1694 */
1695 usb_set_device_state(udev, udev->actconfig
1696 ? USB_STATE_CONFIGURED
1697 : USB_STATE_ADDRESS);
1698 udev->dev.power.power_state = PMSG_ON;
1699
1700 /* 10.5.4.5 says be sure devices in the tree are still there.
1701 * For now let's assume the device didn't go crazy on resume,
1702 * and device drivers will know about any resume quirks.
1703 */
1704 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1705 if (status < 0)
1706 dev_dbg(&udev->dev,
1707 "gone after usb resume? status %d\n",
1708 status);
1709 else if (udev->actconfig) {
1710 unsigned i;
1711
1712 le16_to_cpus(&devstatus);
1713 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1714 status = usb_control_msg(udev,
1715 usb_sndctrlpipe(udev, 0),
1716 USB_REQ_CLEAR_FEATURE,
1717 USB_RECIP_DEVICE,
1718 USB_DEVICE_REMOTE_WAKEUP, 0,
1719 NULL, 0,
1720 USB_CTRL_SET_TIMEOUT);
1721 if (status) {
1722 dev_dbg(&udev->dev, "disable remote "
1723 "wakeup, status %d\n", status);
1724 status = 0;
1725 }
1726 }
1727
1728 /* resume interface drivers; if this is a hub, it
1729 * resumes the child devices
1730 */
1731 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1732 struct usb_interface *intf;
1733 struct usb_driver *driver;
1734
1735 intf = udev->actconfig->interface[i];
1736 if (intf->dev.power.power_state == PMSG_ON)
1737 continue;
1738 if (!intf->dev.driver) {
1739 /* FIXME maybe force to alt 0 */
1740 continue;
1741 }
1742 driver = to_usb_driver(intf->dev.driver);
1743
1744 /* bus_rescan_devices() may rebind drivers */
1745 if (!driver->resume)
1746 continue;
1747
1748 /* can we do better than just logging errors? */
1749 status = driver->resume(intf);
1750 if (intf->dev.power.power_state != PMSG_ON
1751 || status)
1752 dev_dbg(&intf->dev,
1753 "resume fail, state %d code %d\n",
1754 intf->dev.power.power_state, status);
1755 }
1756 status = 0;
1757
1758 } else if (udev->devnum <= 0) {
1759 dev_dbg(&udev->dev, "bogus resume!\n");
1760 status = -EINVAL;
1761 }
1762 return status;
1763 }
1764
1765 static int
1766 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1767 {
1768 int status;
1769
1770 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1771
1772 /* see 7.1.7.7; affects power usage, but not budgeting */
1773 status = clear_port_feature(hub->hdev,
1774 port1, USB_PORT_FEAT_SUSPEND);
1775 if (status) {
1776 dev_dbg(hub->intfdev,
1777 "can't resume port %d, status %d\n",
1778 port1, status);
1779 } else {
1780 u16 devstatus;
1781 u16 portchange;
1782
1783 /* drive resume for at least 20 msec */
1784 if (udev)
1785 dev_dbg(&udev->dev, "RESUME\n");
1786 msleep(25);
1787
1788 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1789 | USB_PORT_STAT_ENABLE \
1790 | USB_PORT_STAT_CONNECTION)
1791
1792 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1793 * stop resume signaling. Then finish the resume
1794 * sequence.
1795 */
1796 devstatus = portchange = 0;
1797 status = hub_port_status(hub, port1,
1798 &devstatus, &portchange);
1799 if (status < 0
1800 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1801 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1802 ) {
1803 dev_dbg(hub->intfdev,
1804 "port %d status %04x.%04x after resume, %d\n",
1805 port1, portchange, devstatus, status);
1806 } else {
1807 /* TRSMRCY = 10 msec */
1808 msleep(10);
1809 if (udev)
1810 status = finish_port_resume(udev);
1811 }
1812 }
1813 if (status < 0)
1814 hub_port_logical_disconnect(hub, port1);
1815
1816 return status;
1817 }
1818
1819 static int hub_resume (struct usb_interface *intf);
1820
1821 /**
1822 * usb_resume_device - re-activate a suspended usb device
1823 * @udev: device to re-activate
1824 * Context: must be able to sleep; device not locked
1825 *
1826 * This will re-activate the suspended device, increasing power usage
1827 * while letting drivers communicate again with its endpoints.
1828 * USB resume explicitly guarantees that the power session between
1829 * the host and the device is the same as it was when the device
1830 * suspended.
1831 *
1832 * Returns 0 on success, else negative errno.
1833 */
1834 int usb_resume_device(struct usb_device *udev)
1835 {
1836 int port1, status;
1837
1838 port1 = locktree(udev);
1839 if (port1 < 0)
1840 return port1;
1841
1842 /* "global resume" of the HC-to-USB interface (root hub), or
1843 * selective resume of one hub-to-device port
1844 */
1845 if (!udev->parent) {
1846 struct usb_bus *bus = udev->bus;
1847 if (bus && bus->op->hub_resume) {
1848 status = bus->op->hub_resume (bus);
1849 } else
1850 status = -EOPNOTSUPP;
1851 if (status == 0) {
1852 dev_dbg(&udev->dev, "usb resume\n");
1853 /* TRSMRCY = 10 msec */
1854 msleep(10);
1855 usb_set_device_state (udev, USB_STATE_CONFIGURED);
1856 udev->dev.power.power_state = PMSG_ON;
1857 status = hub_resume (udev
1858 ->actconfig->interface[0]);
1859 }
1860 } else if (udev->state == USB_STATE_SUSPENDED) {
1861 // NOTE this fails if parent is also suspended...
1862 status = hub_port_resume(hdev_to_hub(udev->parent),
1863 port1, udev);
1864 } else {
1865 status = 0;
1866 }
1867 if (status < 0) {
1868 dev_dbg(&udev->dev, "can't resume, status %d\n",
1869 status);
1870 }
1871
1872 usb_unlock_device(udev);
1873
1874 /* rebind drivers that had no suspend() */
1875 if (status == 0) {
1876 usb_lock_all_devices();
1877 bus_rescan_devices(&usb_bus_type);
1878 usb_unlock_all_devices();
1879 }
1880 return status;
1881 }
1882
1883 static int remote_wakeup(struct usb_device *udev)
1884 {
1885 int status = 0;
1886
1887 /* don't repeat RESUME sequence if this device
1888 * was already woken up by some other task
1889 */
1890 down(&udev->serialize);
1891 if (udev->state == USB_STATE_SUSPENDED) {
1892 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1893 /* TRSMRCY = 10 msec */
1894 msleep(10);
1895 status = finish_port_resume(udev);
1896 }
1897 up(&udev->serialize);
1898 return status;
1899 }
1900
1901 static int hub_suspend(struct usb_interface *intf, pm_message_t state)
1902 {
1903 struct usb_hub *hub = usb_get_intfdata (intf);
1904 struct usb_device *hdev = hub->hdev;
1905 unsigned port1;
1906 int status;
1907
1908 /* stop khubd and related activity */
1909 hub_quiesce(hub);
1910
1911 /* then suspend every port */
1912 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1913 struct usb_device *udev;
1914
1915 udev = hdev->children [port1-1];
1916 if (!udev)
1917 continue;
1918 down(&udev->serialize);
1919 status = __usb_suspend_device(udev, port1, state);
1920 up(&udev->serialize);
1921 if (status < 0)
1922 dev_dbg(&intf->dev, "suspend port %d --> %d\n",
1923 port1, status);
1924 }
1925
1926 intf->dev.power.power_state = state;
1927 return 0;
1928 }
1929
1930 static int hub_resume(struct usb_interface *intf)
1931 {
1932 struct usb_device *hdev = interface_to_usbdev(intf);
1933 struct usb_hub *hub = usb_get_intfdata (intf);
1934 unsigned port1;
1935 int status;
1936
1937 if (intf->dev.power.power_state == PM_SUSPEND_ON)
1938 return 0;
1939
1940 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1941 struct usb_device *udev;
1942 u16 portstat, portchange;
1943
1944 udev = hdev->children [port1-1];
1945 status = hub_port_status(hub, port1, &portstat, &portchange);
1946 if (status == 0) {
1947 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1948 clear_port_feature(hdev, port1,
1949 USB_PORT_FEAT_C_SUSPEND);
1950 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1951 }
1952
1953 /* let khubd handle disconnects etc */
1954 if (portchange)
1955 continue;
1956 }
1957
1958 if (!udev || status < 0)
1959 continue;
1960 down (&udev->serialize);
1961 if (portstat & USB_PORT_STAT_SUSPEND)
1962 status = hub_port_resume(hub, port1, udev);
1963 else {
1964 status = finish_port_resume(udev);
1965 if (status < 0) {
1966 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1967 port1, status);
1968 hub_port_logical_disconnect(hub, port1);
1969 }
1970 }
1971 up(&udev->serialize);
1972 }
1973 intf->dev.power.power_state = PMSG_ON;
1974
1975 hub->resume_root_hub = 0;
1976 hub_activate(hub);
1977 return 0;
1978 }
1979
1980 void usb_resume_root_hub(struct usb_device *hdev)
1981 {
1982 struct usb_hub *hub = hdev_to_hub(hdev);
1983
1984 hub->resume_root_hub = 1;
1985 kick_khubd(hub);
1986 }
1987
1988 #else /* !CONFIG_USB_SUSPEND */
1989
1990 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1991 {
1992 return 0;
1993 }
1994
1995 int usb_resume_device(struct usb_device *udev)
1996 {
1997 return 0;
1998 }
1999
2000 #define hub_suspend NULL
2001 #define hub_resume NULL
2002 #define remote_wakeup(x) 0
2003
2004 #endif /* CONFIG_USB_SUSPEND */
2005
2006 EXPORT_SYMBOL(usb_suspend_device);
2007 EXPORT_SYMBOL(usb_resume_device);
2008
2009
2010
2011 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2012 *
2013 * Between connect detection and reset signaling there must be a delay
2014 * of 100ms at least for debounce and power-settling. The corresponding
2015 * timer shall restart whenever the downstream port detects a disconnect.
2016 *
2017 * Apparently there are some bluetooth and irda-dongles and a number of
2018 * low-speed devices for which this debounce period may last over a second.
2019 * Not covered by the spec - but easy to deal with.
2020 *
2021 * This implementation uses a 1500ms total debounce timeout; if the
2022 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2023 * every 25ms for transient disconnects. When the port status has been
2024 * unchanged for 100ms it returns the port status.
2025 */
2026
2027 #define HUB_DEBOUNCE_TIMEOUT 1500
2028 #define HUB_DEBOUNCE_STEP 25
2029 #define HUB_DEBOUNCE_STABLE 100
2030
2031 static int hub_port_debounce(struct usb_hub *hub, int port1)
2032 {
2033 int ret;
2034 int total_time, stable_time = 0;
2035 u16 portchange, portstatus;
2036 unsigned connection = 0xffff;
2037
2038 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2039 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2040 if (ret < 0)
2041 return ret;
2042
2043 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2044 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2045 stable_time += HUB_DEBOUNCE_STEP;
2046 if (stable_time >= HUB_DEBOUNCE_STABLE)
2047 break;
2048 } else {
2049 stable_time = 0;
2050 connection = portstatus & USB_PORT_STAT_CONNECTION;
2051 }
2052
2053 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2054 clear_port_feature(hub->hdev, port1,
2055 USB_PORT_FEAT_C_CONNECTION);
2056 }
2057
2058 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2059 break;
2060 msleep(HUB_DEBOUNCE_STEP);
2061 }
2062
2063 dev_dbg (hub->intfdev,
2064 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2065 port1, total_time, stable_time, portstatus);
2066
2067 if (stable_time < HUB_DEBOUNCE_STABLE)
2068 return -ETIMEDOUT;
2069 return portstatus;
2070 }
2071
2072 static void ep0_reinit(struct usb_device *udev)
2073 {
2074 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2075 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2076 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2077 }
2078
2079 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2080 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2081
2082 static int hub_set_address(struct usb_device *udev)
2083 {
2084 int retval;
2085
2086 if (udev->devnum == 0)
2087 return -EINVAL;
2088 if (udev->state == USB_STATE_ADDRESS)
2089 return 0;
2090 if (udev->state != USB_STATE_DEFAULT)
2091 return -EINVAL;
2092 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2093 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2094 NULL, 0, USB_CTRL_SET_TIMEOUT);
2095 if (retval == 0) {
2096 usb_set_device_state(udev, USB_STATE_ADDRESS);
2097 ep0_reinit(udev);
2098 }
2099 return retval;
2100 }
2101
2102 /* Reset device, (re)assign address, get device descriptor.
2103 * Device connection must be stable, no more debouncing needed.
2104 * Returns device in USB_STATE_ADDRESS, except on error.
2105 *
2106 * If this is called for an already-existing device (as part of
2107 * usb_reset_device), the caller must own the device lock. For a
2108 * newly detected device that is not accessible through any global
2109 * pointers, it's not necessary to lock the device.
2110 */
2111 static int
2112 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2113 int retry_counter)
2114 {
2115 static DECLARE_MUTEX(usb_address0_sem);
2116
2117 struct usb_device *hdev = hub->hdev;
2118 int i, j, retval;
2119 unsigned delay = HUB_SHORT_RESET_TIME;
2120 enum usb_device_speed oldspeed = udev->speed;
2121
2122 /* root hub ports have a slightly longer reset period
2123 * (from USB 2.0 spec, section 7.1.7.5)
2124 */
2125 if (!hdev->parent) {
2126 delay = HUB_ROOT_RESET_TIME;
2127 if (port1 == hdev->bus->otg_port)
2128 hdev->bus->b_hnp_enable = 0;
2129 }
2130
2131 /* Some low speed devices have problems with the quick delay, so */
2132 /* be a bit pessimistic with those devices. RHbug #23670 */
2133 if (oldspeed == USB_SPEED_LOW)
2134 delay = HUB_LONG_RESET_TIME;
2135
2136 down(&usb_address0_sem);
2137
2138 /* Reset the device; full speed may morph to high speed */
2139 retval = hub_port_reset(hub, port1, udev, delay);
2140 if (retval < 0) /* error or disconnect */
2141 goto fail;
2142 /* success, speed is known */
2143 retval = -ENODEV;
2144
2145 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2146 dev_dbg(&udev->dev, "device reset changed speed!\n");
2147 goto fail;
2148 }
2149 oldspeed = udev->speed;
2150
2151 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2152 * it's fixed size except for full speed devices.
2153 */
2154 switch (udev->speed) {
2155 case USB_SPEED_HIGH: /* fixed at 64 */
2156 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2157 break;
2158 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2159 /* to determine the ep0 maxpacket size, try to read
2160 * the device descriptor to get bMaxPacketSize0 and
2161 * then correct our initial guess.
2162 */
2163 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2164 break;
2165 case USB_SPEED_LOW: /* fixed at 8 */
2166 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2167 break;
2168 default:
2169 goto fail;
2170 }
2171
2172 dev_info (&udev->dev,
2173 "%s %s speed USB device using %s and address %d\n",
2174 (udev->config) ? "reset" : "new",
2175 ({ char *speed; switch (udev->speed) {
2176 case USB_SPEED_LOW: speed = "low"; break;
2177 case USB_SPEED_FULL: speed = "full"; break;
2178 case USB_SPEED_HIGH: speed = "high"; break;
2179 default: speed = "?"; break;
2180 }; speed;}),
2181 udev->bus->controller->driver->name,
2182 udev->devnum);
2183
2184 /* Set up TT records, if needed */
2185 if (hdev->tt) {
2186 udev->tt = hdev->tt;
2187 udev->ttport = hdev->ttport;
2188 } else if (udev->speed != USB_SPEED_HIGH
2189 && hdev->speed == USB_SPEED_HIGH) {
2190 udev->tt = &hub->tt;
2191 udev->ttport = port1;
2192 }
2193
2194 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2195 * Because device hardware and firmware is sometimes buggy in
2196 * this area, and this is how Linux has done it for ages.
2197 * Change it cautiously.
2198 *
2199 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2200 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2201 * so it may help with some non-standards-compliant devices.
2202 * Otherwise we start with SET_ADDRESS and then try to read the
2203 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2204 * value.
2205 */
2206 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2207 if (USE_NEW_SCHEME(retry_counter)) {
2208 struct usb_device_descriptor *buf;
2209 int r = 0;
2210
2211 #define GET_DESCRIPTOR_BUFSIZE 64
2212 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2213 if (!buf) {
2214 retval = -ENOMEM;
2215 continue;
2216 }
2217
2218 /* Use a short timeout the first time through,
2219 * so that recalcitrant full-speed devices with
2220 * 8- or 16-byte ep0-maxpackets won't slow things
2221 * down tremendously by NAKing the unexpectedly
2222 * early status stage. Also, retry on all errors;
2223 * some devices are flakey.
2224 */
2225 for (j = 0; j < 3; ++j) {
2226 buf->bMaxPacketSize0 = 0;
2227 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2228 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2229 USB_DT_DEVICE << 8, 0,
2230 buf, GET_DESCRIPTOR_BUFSIZE,
2231 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2232 switch (buf->bMaxPacketSize0) {
2233 case 8: case 16: case 32: case 64:
2234 if (buf->bDescriptorType ==
2235 USB_DT_DEVICE) {
2236 r = 0;
2237 break;
2238 }
2239 /* FALL THROUGH */
2240 default:
2241 if (r == 0)
2242 r = -EPROTO;
2243 break;
2244 }
2245 if (r == 0)
2246 break;
2247 }
2248 udev->descriptor.bMaxPacketSize0 =
2249 buf->bMaxPacketSize0;
2250 kfree(buf);
2251
2252 retval = hub_port_reset(hub, port1, udev, delay);
2253 if (retval < 0) /* error or disconnect */
2254 goto fail;
2255 if (oldspeed != udev->speed) {
2256 dev_dbg(&udev->dev,
2257 "device reset changed speed!\n");
2258 retval = -ENODEV;
2259 goto fail;
2260 }
2261 if (r) {
2262 dev_err(&udev->dev, "device descriptor "
2263 "read/%s, error %d\n",
2264 "64", r);
2265 retval = -EMSGSIZE;
2266 continue;
2267 }
2268 #undef GET_DESCRIPTOR_BUFSIZE
2269 }
2270
2271 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2272 retval = hub_set_address(udev);
2273 if (retval >= 0)
2274 break;
2275 msleep(200);
2276 }
2277 if (retval < 0) {
2278 dev_err(&udev->dev,
2279 "device not accepting address %d, error %d\n",
2280 udev->devnum, retval);
2281 goto fail;
2282 }
2283
2284 /* cope with hardware quirkiness:
2285 * - let SET_ADDRESS settle, some device hardware wants it
2286 * - read ep0 maxpacket even for high and low speed,
2287 */
2288 msleep(10);
2289 if (USE_NEW_SCHEME(retry_counter))
2290 break;
2291
2292 retval = usb_get_device_descriptor(udev, 8);
2293 if (retval < 8) {
2294 dev_err(&udev->dev, "device descriptor "
2295 "read/%s, error %d\n",
2296 "8", retval);
2297 if (retval >= 0)
2298 retval = -EMSGSIZE;
2299 } else {
2300 retval = 0;
2301 break;
2302 }
2303 }
2304 if (retval)
2305 goto fail;
2306
2307 i = udev->descriptor.bMaxPacketSize0;
2308 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2309 if (udev->speed != USB_SPEED_FULL ||
2310 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2311 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2312 retval = -EMSGSIZE;
2313 goto fail;
2314 }
2315 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2316 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2317 ep0_reinit(udev);
2318 }
2319
2320 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2321 if (retval < (signed)sizeof(udev->descriptor)) {
2322 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2323 "all", retval);
2324 if (retval >= 0)
2325 retval = -ENOMSG;
2326 goto fail;
2327 }
2328
2329 retval = 0;
2330
2331 fail:
2332 if (retval)
2333 hub_port_disable(hub, port1, 0);
2334 up(&usb_address0_sem);
2335 return retval;
2336 }
2337
2338 static void
2339 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2340 {
2341 struct usb_qualifier_descriptor *qual;
2342 int status;
2343
2344 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2345 if (qual == NULL)
2346 return;
2347
2348 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2349 qual, sizeof *qual);
2350 if (status == sizeof *qual) {
2351 dev_info(&udev->dev, "not running at top speed; "
2352 "connect to a high speed hub\n");
2353 /* hub LEDs are probably harder to miss than syslog */
2354 if (hub->has_indicators) {
2355 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2356 schedule_work (&hub->leds);
2357 }
2358 }
2359 kfree(qual);
2360 }
2361
2362 static unsigned
2363 hub_power_remaining (struct usb_hub *hub)
2364 {
2365 struct usb_device *hdev = hub->hdev;
2366 int remaining;
2367 unsigned i;
2368
2369 remaining = hub->power_budget;
2370 if (!remaining) /* self-powered */
2371 return 0;
2372
2373 for (i = 0; i < hdev->maxchild; i++) {
2374 struct usb_device *udev = hdev->children[i];
2375 int delta, ceiling;
2376
2377 if (!udev)
2378 continue;
2379
2380 /* 100mA per-port ceiling, or 8mA for OTG ports */
2381 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2382 ceiling = 50;
2383 else
2384 ceiling = 4;
2385
2386 if (udev->actconfig)
2387 delta = udev->actconfig->desc.bMaxPower;
2388 else
2389 delta = ceiling;
2390 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2391 if (delta > ceiling)
2392 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2393 2 * (delta - ceiling), 2 * ceiling);
2394 remaining -= delta;
2395 }
2396 if (remaining < 0) {
2397 dev_warn(hub->intfdev,
2398 "%dmA over power budget!\n",
2399 -2 * remaining);
2400 remaining = 0;
2401 }
2402 return remaining;
2403 }
2404
2405 /* Handle physical or logical connection change events.
2406 * This routine is called when:
2407 * a port connection-change occurs;
2408 * a port enable-change occurs (often caused by EMI);
2409 * usb_reset_device() encounters changed descriptors (as from
2410 * a firmware download)
2411 * caller already locked the hub
2412 */
2413 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2414 u16 portstatus, u16 portchange)
2415 {
2416 struct usb_device *hdev = hub->hdev;
2417 struct device *hub_dev = hub->intfdev;
2418 int status, i;
2419
2420 dev_dbg (hub_dev,
2421 "port %d, status %04x, change %04x, %s\n",
2422 port1, portstatus, portchange, portspeed (portstatus));
2423
2424 if (hub->has_indicators) {
2425 set_port_led(hub, port1, HUB_LED_AUTO);
2426 hub->indicator[port1-1] = INDICATOR_AUTO;
2427 }
2428
2429 /* Disconnect any existing devices under this port */
2430 if (hdev->children[port1-1])
2431 usb_disconnect(&hdev->children[port1-1]);
2432 clear_bit(port1, hub->change_bits);
2433
2434 #ifdef CONFIG_USB_OTG
2435 /* during HNP, don't repeat the debounce */
2436 if (hdev->bus->is_b_host)
2437 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2438 #endif
2439
2440 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2441 status = hub_port_debounce(hub, port1);
2442 if (status < 0) {
2443 dev_err (hub_dev,
2444 "connect-debounce failed, port %d disabled\n",
2445 port1);
2446 goto done;
2447 }
2448 portstatus = status;
2449 }
2450
2451 /* Return now if nothing is connected */
2452 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2453
2454 /* maybe switch power back on (e.g. root hub was reset) */
2455 if ((hub->descriptor->wHubCharacteristics
2456 & HUB_CHAR_LPSM) < 2
2457 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2458 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2459
2460 if (portstatus & USB_PORT_STAT_ENABLE)
2461 goto done;
2462 return;
2463 }
2464
2465 #ifdef CONFIG_USB_SUSPEND
2466 /* If something is connected, but the port is suspended, wake it up. */
2467 if (portstatus & USB_PORT_STAT_SUSPEND) {
2468 status = hub_port_resume(hub, port1, NULL);
2469 if (status < 0) {
2470 dev_dbg(hub_dev,
2471 "can't clear suspend on port %d; %d\n",
2472 port1, status);
2473 goto done;
2474 }
2475 }
2476 #endif
2477
2478 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2479 struct usb_device *udev;
2480
2481 /* reallocate for each attempt, since references
2482 * to the previous one can escape in various ways
2483 */
2484 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2485 if (!udev) {
2486 dev_err (hub_dev,
2487 "couldn't allocate port %d usb_device\n",
2488 port1);
2489 goto done;
2490 }
2491
2492 usb_set_device_state(udev, USB_STATE_POWERED);
2493 udev->speed = USB_SPEED_UNKNOWN;
2494
2495 /* set the address */
2496 choose_address(udev);
2497 if (udev->devnum <= 0) {
2498 status = -ENOTCONN; /* Don't retry */
2499 goto loop;
2500 }
2501
2502 /* reset and get descriptor */
2503 status = hub_port_init(hub, udev, port1, i);
2504 if (status < 0)
2505 goto loop;
2506
2507 /* consecutive bus-powered hubs aren't reliable; they can
2508 * violate the voltage drop budget. if the new child has
2509 * a "powered" LED, users should notice we didn't enable it
2510 * (without reading syslog), even without per-port LEDs
2511 * on the parent.
2512 */
2513 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2514 && hub->power_budget) {
2515 u16 devstat;
2516
2517 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2518 &devstat);
2519 if (status < 0) {
2520 dev_dbg(&udev->dev, "get status %d ?\n", status);
2521 goto loop_disable;
2522 }
2523 cpu_to_le16s(&devstat);
2524 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2525 dev_err(&udev->dev,
2526 "can't connect bus-powered hub "
2527 "to this port\n");
2528 if (hub->has_indicators) {
2529 hub->indicator[port1-1] =
2530 INDICATOR_AMBER_BLINK;
2531 schedule_work (&hub->leds);
2532 }
2533 status = -ENOTCONN; /* Don't retry */
2534 goto loop_disable;
2535 }
2536 }
2537
2538 /* check for devices running slower than they could */
2539 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2540 && udev->speed == USB_SPEED_FULL
2541 && highspeed_hubs != 0)
2542 check_highspeed (hub, udev, port1);
2543
2544 /* Store the parent's children[] pointer. At this point
2545 * udev becomes globally accessible, although presumably
2546 * no one will look at it until hdev is unlocked.
2547 */
2548 down (&udev->serialize);
2549 status = 0;
2550
2551 /* We mustn't add new devices if the parent hub has
2552 * been disconnected; we would race with the
2553 * recursively_mark_NOTATTACHED() routine.
2554 */
2555 spin_lock_irq(&device_state_lock);
2556 if (hdev->state == USB_STATE_NOTATTACHED)
2557 status = -ENOTCONN;
2558 else
2559 hdev->children[port1-1] = udev;
2560 spin_unlock_irq(&device_state_lock);
2561
2562 /* Run it through the hoops (find a driver, etc) */
2563 if (!status) {
2564 status = usb_new_device(udev);
2565 if (status) {
2566 spin_lock_irq(&device_state_lock);
2567 hdev->children[port1-1] = NULL;
2568 spin_unlock_irq(&device_state_lock);
2569 }
2570 }
2571
2572 up (&udev->serialize);
2573 if (status)
2574 goto loop_disable;
2575
2576 status = hub_power_remaining(hub);
2577 if (status)
2578 dev_dbg(hub_dev,
2579 "%dmA power budget left\n",
2580 2 * status);
2581
2582 return;
2583
2584 loop_disable:
2585 hub_port_disable(hub, port1, 1);
2586 loop:
2587 ep0_reinit(udev);
2588 release_address(udev);
2589 usb_put_dev(udev);
2590 if (status == -ENOTCONN)
2591 break;
2592 }
2593
2594 done:
2595 hub_port_disable(hub, port1, 1);
2596 }
2597
2598 static void hub_events(void)
2599 {
2600 struct list_head *tmp;
2601 struct usb_device *hdev;
2602 struct usb_interface *intf;
2603 struct usb_hub *hub;
2604 struct device *hub_dev;
2605 u16 hubstatus;
2606 u16 hubchange;
2607 u16 portstatus;
2608 u16 portchange;
2609 int i, ret;
2610 int connect_change;
2611
2612 /*
2613 * We restart the list every time to avoid a deadlock with
2614 * deleting hubs downstream from this one. This should be
2615 * safe since we delete the hub from the event list.
2616 * Not the most efficient, but avoids deadlocks.
2617 */
2618 while (1) {
2619
2620 /* Grab the first entry at the beginning of the list */
2621 spin_lock_irq(&hub_event_lock);
2622 if (list_empty(&hub_event_list)) {
2623 spin_unlock_irq(&hub_event_lock);
2624 break;
2625 }
2626
2627 tmp = hub_event_list.next;
2628 list_del_init(tmp);
2629
2630 hub = list_entry(tmp, struct usb_hub, event_list);
2631 hdev = hub->hdev;
2632 intf = to_usb_interface(hub->intfdev);
2633 hub_dev = &intf->dev;
2634
2635 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2636 hdev->state, hub->descriptor
2637 ? hub->descriptor->bNbrPorts
2638 : 0,
2639 /* NOTE: expects max 15 ports... */
2640 (u16) hub->change_bits[0],
2641 (u16) hub->event_bits[0]);
2642
2643 usb_get_intf(intf);
2644 i = hub->resume_root_hub;
2645 spin_unlock_irq(&hub_event_lock);
2646
2647 /* Is this is a root hub wanting to be resumed? */
2648 if (i)
2649 usb_resume_device(hdev);
2650
2651 /* Lock the device, then check to see if we were
2652 * disconnected while waiting for the lock to succeed. */
2653 if (locktree(hdev) < 0) {
2654 usb_put_intf(intf);
2655 continue;
2656 }
2657 if (hub != usb_get_intfdata(intf))
2658 goto loop;
2659
2660 /* If the hub has died, clean up after it */
2661 if (hdev->state == USB_STATE_NOTATTACHED) {
2662 hub_pre_reset(hub);
2663 goto loop;
2664 }
2665
2666 /* If this is an inactive or suspended hub, do nothing */
2667 if (hub->quiescing)
2668 goto loop;
2669
2670 if (hub->error) {
2671 dev_dbg (hub_dev, "resetting for error %d\n",
2672 hub->error);
2673
2674 ret = usb_reset_device(hdev);
2675 if (ret) {
2676 dev_dbg (hub_dev,
2677 "error resetting hub: %d\n", ret);
2678 goto loop;
2679 }
2680
2681 hub->nerrors = 0;
2682 hub->error = 0;
2683 }
2684
2685 /* deal with port status changes */
2686 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2687 if (test_bit(i, hub->busy_bits))
2688 continue;
2689 connect_change = test_bit(i, hub->change_bits);
2690 if (!test_and_clear_bit(i, hub->event_bits) &&
2691 !connect_change && !hub->activating)
2692 continue;
2693
2694 ret = hub_port_status(hub, i,
2695 &portstatus, &portchange);
2696 if (ret < 0)
2697 continue;
2698
2699 if (hub->activating && !hdev->children[i-1] &&
2700 (portstatus &
2701 USB_PORT_STAT_CONNECTION))
2702 connect_change = 1;
2703
2704 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2705 clear_port_feature(hdev, i,
2706 USB_PORT_FEAT_C_CONNECTION);
2707 connect_change = 1;
2708 }
2709
2710 if (portchange & USB_PORT_STAT_C_ENABLE) {
2711 if (!connect_change)
2712 dev_dbg (hub_dev,
2713 "port %d enable change, "
2714 "status %08x\n",
2715 i, portstatus);
2716 clear_port_feature(hdev, i,
2717 USB_PORT_FEAT_C_ENABLE);
2718
2719 /*
2720 * EM interference sometimes causes badly
2721 * shielded USB devices to be shutdown by
2722 * the hub, this hack enables them again.
2723 * Works at least with mouse driver.
2724 */
2725 if (!(portstatus & USB_PORT_STAT_ENABLE)
2726 && !connect_change
2727 && hdev->children[i-1]) {
2728 dev_err (hub_dev,
2729 "port %i "
2730 "disabled by hub (EMI?), "
2731 "re-enabling...\n",
2732 i);
2733 connect_change = 1;
2734 }
2735 }
2736
2737 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2738 clear_port_feature(hdev, i,
2739 USB_PORT_FEAT_C_SUSPEND);
2740 if (hdev->children[i-1]) {
2741 ret = remote_wakeup(hdev->
2742 children[i-1]);
2743 if (ret < 0)
2744 connect_change = 1;
2745 } else {
2746 ret = -ENODEV;
2747 hub_port_disable(hub, i, 1);
2748 }
2749 dev_dbg (hub_dev,
2750 "resume on port %d, status %d\n",
2751 i, ret);
2752 }
2753
2754 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2755 dev_err (hub_dev,
2756 "over-current change on port %d\n",
2757 i);
2758 clear_port_feature(hdev, i,
2759 USB_PORT_FEAT_C_OVER_CURRENT);
2760 hub_power_on(hub);
2761 }
2762
2763 if (portchange & USB_PORT_STAT_C_RESET) {
2764 dev_dbg (hub_dev,
2765 "reset change on port %d\n",
2766 i);
2767 clear_port_feature(hdev, i,
2768 USB_PORT_FEAT_C_RESET);
2769 }
2770
2771 if (connect_change)
2772 hub_port_connect_change(hub, i,
2773 portstatus, portchange);
2774 } /* end for i */
2775
2776 /* deal with hub status changes */
2777 if (test_and_clear_bit(0, hub->event_bits) == 0)
2778 ; /* do nothing */
2779 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2780 dev_err (hub_dev, "get_hub_status failed\n");
2781 else {
2782 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2783 dev_dbg (hub_dev, "power change\n");
2784 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2785 }
2786 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2787 dev_dbg (hub_dev, "overcurrent change\n");
2788 msleep(500); /* Cool down */
2789 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2790 hub_power_on(hub);
2791 }
2792 }
2793
2794 hub->activating = 0;
2795
2796 /* If this is a root hub, tell the HCD it's okay to
2797 * re-enable port-change interrupts now. */
2798 if (!hdev->parent)
2799 usb_enable_root_hub_irq(hdev->bus);
2800
2801 loop:
2802 usb_unlock_device(hdev);
2803 usb_put_intf(intf);
2804
2805 } /* end while (1) */
2806 }
2807
2808 static int hub_thread(void *__unused)
2809 {
2810 do {
2811 hub_events();
2812 wait_event_interruptible(khubd_wait,
2813 !list_empty(&hub_event_list) ||
2814 kthread_should_stop());
2815 try_to_freeze();
2816 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2817
2818 pr_debug("%s: khubd exiting\n", usbcore_name);
2819 return 0;
2820 }
2821
2822 static struct usb_device_id hub_id_table [] = {
2823 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2824 .bDeviceClass = USB_CLASS_HUB},
2825 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2826 .bInterfaceClass = USB_CLASS_HUB},
2827 { } /* Terminating entry */
2828 };
2829
2830 MODULE_DEVICE_TABLE (usb, hub_id_table);
2831
2832 static struct usb_driver hub_driver = {
2833 .owner = THIS_MODULE,
2834 .name = "hub",
2835 .probe = hub_probe,
2836 .disconnect = hub_disconnect,
2837 .suspend = hub_suspend,
2838 .resume = hub_resume,
2839 .ioctl = hub_ioctl,
2840 .id_table = hub_id_table,
2841 };
2842
2843 int usb_hub_init(void)
2844 {
2845 if (usb_register(&hub_driver) < 0) {
2846 printk(KERN_ERR "%s: can't register hub driver\n",
2847 usbcore_name);
2848 return -1;
2849 }
2850
2851 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2852 if (!IS_ERR(khubd_task))
2853 return 0;
2854
2855 /* Fall through if kernel_thread failed */
2856 usb_deregister(&hub_driver);
2857 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2858
2859 return -1;
2860 }
2861
2862 void usb_hub_cleanup(void)
2863 {
2864 kthread_stop(khubd_task);
2865
2866 /*
2867 * Hub resources are freed for us by usb_deregister. It calls
2868 * usb_driver_purge on every device which in turn calls that
2869 * devices disconnect function if it is using this driver.
2870 * The hub_disconnect function takes care of releasing the
2871 * individual hub resources. -greg
2872 */
2873 usb_deregister(&hub_driver);
2874 } /* usb_hub_cleanup() */
2875
2876 static int config_descriptors_changed(struct usb_device *udev)
2877 {
2878 unsigned index;
2879 unsigned len = 0;
2880 struct usb_config_descriptor *buf;
2881
2882 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2883 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2884 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2885 }
2886 buf = kmalloc (len, SLAB_KERNEL);
2887 if (buf == NULL) {
2888 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2889 /* assume the worst */
2890 return 1;
2891 }
2892 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2893 int length;
2894 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2895
2896 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2897 old_length);
2898 if (length < old_length) {
2899 dev_dbg(&udev->dev, "config index %d, error %d\n",
2900 index, length);
2901 break;
2902 }
2903 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2904 != 0) {
2905 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2906 index, buf->bConfigurationValue);
2907 break;
2908 }
2909 }
2910 kfree(buf);
2911 return index != udev->descriptor.bNumConfigurations;
2912 }
2913
2914 /**
2915 * usb_reset_device - perform a USB port reset to reinitialize a device
2916 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2917 *
2918 * WARNING - don't reset any device unless drivers for all of its
2919 * interfaces are expecting that reset! Maybe some driver->reset()
2920 * method should eventually help ensure sufficient cooperation.
2921 *
2922 * Do a port reset, reassign the device's address, and establish its
2923 * former operating configuration. If the reset fails, or the device's
2924 * descriptors change from their values before the reset, or the original
2925 * configuration and altsettings cannot be restored, a flag will be set
2926 * telling khubd to pretend the device has been disconnected and then
2927 * re-connected. All drivers will be unbound, and the device will be
2928 * re-enumerated and probed all over again.
2929 *
2930 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2931 * flagged for logical disconnection, or some other negative error code
2932 * if the reset wasn't even attempted.
2933 *
2934 * The caller must own the device lock. For example, it's safe to use
2935 * this from a driver probe() routine after downloading new firmware.
2936 * For calls that might not occur during probe(), drivers should lock
2937 * the device using usb_lock_device_for_reset().
2938 */
2939 int usb_reset_device(struct usb_device *udev)
2940 {
2941 struct usb_device *parent_hdev = udev->parent;
2942 struct usb_hub *parent_hub;
2943 struct usb_device_descriptor descriptor = udev->descriptor;
2944 struct usb_hub *hub = NULL;
2945 int i, ret = 0, port1 = -1;
2946
2947 if (udev->state == USB_STATE_NOTATTACHED ||
2948 udev->state == USB_STATE_SUSPENDED) {
2949 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2950 udev->state);
2951 return -EINVAL;
2952 }
2953
2954 if (!parent_hdev) {
2955 /* this requires hcd-specific logic; see OHCI hc_restart() */
2956 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2957 return -EISDIR;
2958 }
2959
2960 for (i = 0; i < parent_hdev->maxchild; i++)
2961 if (parent_hdev->children[i] == udev) {
2962 port1 = i + 1;
2963 break;
2964 }
2965
2966 if (port1 < 0) {
2967 /* If this ever happens, it's very bad */
2968 dev_err(&udev->dev, "Can't locate device's port!\n");
2969 return -ENOENT;
2970 }
2971 parent_hub = hdev_to_hub(parent_hdev);
2972
2973 /* If we're resetting an active hub, take some special actions */
2974 if (udev->actconfig &&
2975 udev->actconfig->interface[0]->dev.driver ==
2976 &hub_driver.driver &&
2977 (hub = hdev_to_hub(udev)) != NULL) {
2978 hub_pre_reset(hub);
2979 }
2980
2981 set_bit(port1, parent_hub->busy_bits);
2982 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2983
2984 /* ep0 maxpacket size may change; let the HCD know about it.
2985 * Other endpoints will be handled by re-enumeration. */
2986 ep0_reinit(udev);
2987 ret = hub_port_init(parent_hub, udev, port1, i);
2988 if (ret >= 0)
2989 break;
2990 }
2991 clear_bit(port1, parent_hub->busy_bits);
2992 if (ret < 0)
2993 goto re_enumerate;
2994
2995 /* Device might have changed firmware (DFU or similar) */
2996 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2997 || config_descriptors_changed (udev)) {
2998 dev_info(&udev->dev, "device firmware changed\n");
2999 udev->descriptor = descriptor; /* for disconnect() calls */
3000 goto re_enumerate;
3001 }
3002
3003 if (!udev->actconfig)
3004 goto done;
3005
3006 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3007 USB_REQ_SET_CONFIGURATION, 0,
3008 udev->actconfig->desc.bConfigurationValue, 0,
3009 NULL, 0, USB_CTRL_SET_TIMEOUT);
3010 if (ret < 0) {
3011 dev_err(&udev->dev,
3012 "can't restore configuration #%d (error=%d)\n",
3013 udev->actconfig->desc.bConfigurationValue, ret);
3014 goto re_enumerate;
3015 }
3016 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3017
3018 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3019 struct usb_interface *intf = udev->actconfig->interface[i];
3020 struct usb_interface_descriptor *desc;
3021
3022 /* set_interface resets host side toggle even
3023 * for altsetting zero. the interface may have no driver.
3024 */
3025 desc = &intf->cur_altsetting->desc;
3026 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3027 desc->bAlternateSetting);
3028 if (ret < 0) {
3029 dev_err(&udev->dev, "failed to restore interface %d "
3030 "altsetting %d (error=%d)\n",
3031 desc->bInterfaceNumber,
3032 desc->bAlternateSetting,
3033 ret);
3034 goto re_enumerate;
3035 }
3036 }
3037
3038 done:
3039 if (hub)
3040 hub_post_reset(hub);
3041 return 0;
3042
3043 re_enumerate:
3044 hub_port_logical_disconnect(parent_hub, port1);
3045 return -ENODEV;
3046 }
linux-next