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[PATCH] USB: kfree cleanup for drivers/usb/* - no need to check for NULL
[linux-2.6.22.y-op.git] / drivers / usb / core / hub.c
blobd2d648ee864009cc028d2ce539ffede88f9bf17f
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
30 #include <asm/semaphore.h>
31 #include <asm/uaccess.h>
32 #include <asm/byteorder.h>
33
34 #include "usb.h"
35 #include "hcd.h"
36 #include "hub.h"
37
38 /* Protect struct usb_device->state and ->children members
39 * Note: Both are also protected by ->serialize, except that ->state can
40 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
41 static DEFINE_SPINLOCK(device_state_lock);
42
43 /* khubd's worklist and its lock */
44 static DEFINE_SPINLOCK(hub_event_lock);
45 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
46
47 /* Wakes up khubd */
48 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
49
50 static pid_t khubd_pid = 0; /* PID of khubd */
51 static DECLARE_COMPLETION(khubd_exited);
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 cpu_to_le16s(&hubstatus);
647 if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
648 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
649 hub->descriptor->bHubContrCurrent);
650 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
651 / 2;
652 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
653 hub->power_budget * 2);
654 }
655
656
657 ret = hub_hub_status(hub, &hubstatus, &hubchange);
658 if (ret < 0) {
659 message = "can't get hub status";
660 goto fail;
661 }
662
663 /* local power status reports aren't always correct */
664 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
665 dev_dbg(hub_dev, "local power source is %s\n",
666 (hubstatus & HUB_STATUS_LOCAL_POWER)
667 ? "lost (inactive)" : "good");
668
669 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
670 dev_dbg(hub_dev, "%sover-current condition exists\n",
671 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
672
673 /* set up the interrupt endpoint */
674 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
675 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
676
677 if (maxp > sizeof(*hub->buffer))
678 maxp = sizeof(*hub->buffer);
679
680 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
681 if (!hub->urb) {
682 message = "couldn't allocate interrupt urb";
683 ret = -ENOMEM;
684 goto fail;
685 }
686
687 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
688 hub, endpoint->bInterval);
689 hub->urb->transfer_dma = hub->buffer_dma;
690 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
691
692 /* maybe cycle the hub leds */
693 if (hub->has_indicators && blinkenlights)
694 hub->indicator [0] = INDICATOR_CYCLE;
695
696 hub_power_on(hub);
697 hub_activate(hub);
698 return 0;
699
700 fail:
701 dev_err (hub_dev, "config failed, %s (err %d)\n",
702 message, ret);
703 /* hub_disconnect() frees urb and descriptor */
704 return ret;
705 }
706
707 static unsigned highspeed_hubs;
708
709 static void hub_disconnect(struct usb_interface *intf)
710 {
711 struct usb_hub *hub = usb_get_intfdata (intf);
712 struct usb_device *hdev;
713
714 if (!hub)
715 return;
716 hdev = hub->hdev;
717
718 if (hdev->speed == USB_SPEED_HIGH)
719 highspeed_hubs--;
720
721 usb_set_intfdata (intf, NULL);
722
723 hub_quiesce(hub);
724 usb_free_urb(hub->urb);
725 hub->urb = NULL;
726
727 spin_lock_irq(&hub_event_lock);
728 list_del_init(&hub->event_list);
729 spin_unlock_irq(&hub_event_lock);
730
731 kfree(hub->descriptor);
732 hub->descriptor = NULL;
733
734 kfree(hub->status);
735 hub->status = NULL;
736
737 if (hub->buffer) {
738 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
739 hub->buffer_dma);
740 hub->buffer = NULL;
741 }
742
743 /* Free the memory */
744 kfree(hub);
745 }
746
747 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
748 {
749 struct usb_host_interface *desc;
750 struct usb_endpoint_descriptor *endpoint;
751 struct usb_device *hdev;
752 struct usb_hub *hub;
753
754 desc = intf->cur_altsetting;
755 hdev = interface_to_usbdev(intf);
756
757 /* Some hubs have a subclass of 1, which AFAICT according to the */
758 /* specs is not defined, but it works */
759 if ((desc->desc.bInterfaceSubClass != 0) &&
760 (desc->desc.bInterfaceSubClass != 1)) {
761 descriptor_error:
762 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
763 return -EIO;
764 }
765
766 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
767 if (desc->desc.bNumEndpoints != 1)
768 goto descriptor_error;
769
770 endpoint = &desc->endpoint[0].desc;
771
772 /* Output endpoint? Curiouser and curiouser.. */
773 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
774 goto descriptor_error;
775
776 /* If it's not an interrupt endpoint, we'd better punt! */
777 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
778 != USB_ENDPOINT_XFER_INT)
779 goto descriptor_error;
780
781 /* We found a hub */
782 dev_info (&intf->dev, "USB hub found\n");
783
784 hub = kmalloc(sizeof(*hub), GFP_KERNEL);
785 if (!hub) {
786 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
787 return -ENOMEM;
788 }
789
790 memset(hub, 0, sizeof(*hub));
791
792 INIT_LIST_HEAD(&hub->event_list);
793 hub->intfdev = &intf->dev;
794 hub->hdev = hdev;
795 INIT_WORK(&hub->leds, led_work, hub);
796
797 usb_set_intfdata (intf, hub);
798
799 if (hdev->speed == USB_SPEED_HIGH)
800 highspeed_hubs++;
801
802 if (hub_configure(hub, endpoint) >= 0)
803 return 0;
804
805 hub_disconnect (intf);
806 return -ENODEV;
807 }
808
809 static int
810 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
811 {
812 struct usb_device *hdev = interface_to_usbdev (intf);
813
814 /* assert ifno == 0 (part of hub spec) */
815 switch (code) {
816 case USBDEVFS_HUB_PORTINFO: {
817 struct usbdevfs_hub_portinfo *info = user_data;
818 int i;
819
820 spin_lock_irq(&device_state_lock);
821 if (hdev->devnum <= 0)
822 info->nports = 0;
823 else {
824 info->nports = hdev->maxchild;
825 for (i = 0; i < info->nports; i++) {
826 if (hdev->children[i] == NULL)
827 info->port[i] = 0;
828 else
829 info->port[i] =
830 hdev->children[i]->devnum;
831 }
832 }
833 spin_unlock_irq(&device_state_lock);
834
835 return info->nports + 1;
836 }
837
838 default:
839 return -ENOSYS;
840 }
841 }
842
843 /* caller has locked the hub device */
844 static void hub_pre_reset(struct usb_hub *hub)
845 {
846 struct usb_device *hdev = hub->hdev;
847 int i;
848
849 for (i = 0; i < hdev->maxchild; ++i) {
850 if (hdev->children[i])
851 usb_disconnect(&hdev->children[i]);
852 }
853 hub_quiesce(hub);
854 }
855
856 /* caller has locked the hub device */
857 static void hub_post_reset(struct usb_hub *hub)
858 {
859 hub_activate(hub);
860 hub_power_on(hub);
861 }
862
863
864 /* grab device/port lock, returning index of that port (zero based).
865 * protects the upstream link used by this device from concurrent
866 * tree operations like suspend, resume, reset, and disconnect, which
867 * apply to everything downstream of a given port.
868 */
869 static int locktree(struct usb_device *udev)
870 {
871 int t;
872 struct usb_device *hdev;
873
874 if (!udev)
875 return -ENODEV;
876
877 /* root hub is always the first lock in the series */
878 hdev = udev->parent;
879 if (!hdev) {
880 usb_lock_device(udev);
881 return 0;
882 }
883
884 /* on the path from root to us, lock everything from
885 * top down, dropping parent locks when not needed
886 */
887 t = locktree(hdev);
888 if (t < 0)
889 return t;
890 for (t = 0; t < hdev->maxchild; t++) {
891 if (hdev->children[t] == udev) {
892 /* everything is fail-fast once disconnect
893 * processing starts
894 */
895 if (udev->state == USB_STATE_NOTATTACHED)
896 break;
897
898 /* when everyone grabs locks top->bottom,
899 * non-overlapping work may be concurrent
900 */
901 down(&udev->serialize);
902 up(&hdev->serialize);
903 return t + 1;
904 }
905 }
906 usb_unlock_device(hdev);
907 return -ENODEV;
908 }
909
910 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
911 {
912 int i;
913
914 for (i = 0; i < udev->maxchild; ++i) {
915 if (udev->children[i])
916 recursively_mark_NOTATTACHED(udev->children[i]);
917 }
918 udev->state = USB_STATE_NOTATTACHED;
919 }
920
921 /**
922 * usb_set_device_state - change a device's current state (usbcore, hcds)
923 * @udev: pointer to device whose state should be changed
924 * @new_state: new state value to be stored
925 *
926 * udev->state is _not_ fully protected by the device lock. Although
927 * most transitions are made only while holding the lock, the state can
928 * can change to USB_STATE_NOTATTACHED at almost any time. This
929 * is so that devices can be marked as disconnected as soon as possible,
930 * without having to wait for any semaphores to be released. As a result,
931 * all changes to any device's state must be protected by the
932 * device_state_lock spinlock.
933 *
934 * Once a device has been added to the device tree, all changes to its state
935 * should be made using this routine. The state should _not_ be set directly.
936 *
937 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
938 * Otherwise udev->state is set to new_state, and if new_state is
939 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
940 * to USB_STATE_NOTATTACHED.
941 */
942 void usb_set_device_state(struct usb_device *udev,
943 enum usb_device_state new_state)
944 {
945 unsigned long flags;
946
947 spin_lock_irqsave(&device_state_lock, flags);
948 if (udev->state == USB_STATE_NOTATTACHED)
949 ; /* do nothing */
950 else if (new_state != USB_STATE_NOTATTACHED)
951 udev->state = new_state;
952 else
953 recursively_mark_NOTATTACHED(udev);
954 spin_unlock_irqrestore(&device_state_lock, flags);
955 }
956 EXPORT_SYMBOL(usb_set_device_state);
957
958
959 static void choose_address(struct usb_device *udev)
960 {
961 int devnum;
962 struct usb_bus *bus = udev->bus;
963
964 /* If khubd ever becomes multithreaded, this will need a lock */
965
966 /* Try to allocate the next devnum beginning at bus->devnum_next. */
967 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
968 bus->devnum_next);
969 if (devnum >= 128)
970 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
971
972 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
973
974 if (devnum < 128) {
975 set_bit(devnum, bus->devmap.devicemap);
976 udev->devnum = devnum;
977 }
978 }
979
980 static void release_address(struct usb_device *udev)
981 {
982 if (udev->devnum > 0) {
983 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
984 udev->devnum = -1;
985 }
986 }
987
988 /**
989 * usb_disconnect - disconnect a device (usbcore-internal)
990 * @pdev: pointer to device being disconnected
991 * Context: !in_interrupt ()
992 *
993 * Something got disconnected. Get rid of it and all of its children.
994 *
995 * If *pdev is a normal device then the parent hub must already be locked.
996 * If *pdev is a root hub then this routine will acquire the
997 * usb_bus_list_lock on behalf of the caller.
998 *
999 * Only hub drivers (including virtual root hub drivers for host
1000 * controllers) should ever call this.
1001 *
1002 * This call is synchronous, and may not be used in an interrupt context.
1003 */
1004 void usb_disconnect(struct usb_device **pdev)
1005 {
1006 struct usb_device *udev = *pdev;
1007 int i;
1008
1009 if (!udev) {
1010 pr_debug ("%s nodev\n", __FUNCTION__);
1011 return;
1012 }
1013
1014 /* mark the device as inactive, so any further urb submissions for
1015 * this device (and any of its children) will fail immediately.
1016 * this quiesces everyting except pending urbs.
1017 */
1018 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1019
1020 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1021 if (!udev->parent) {
1022 down(&usb_bus_list_lock);
1023 usb_lock_device(udev);
1024 } else
1025 down(&udev->serialize);
1026
1027 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1028
1029 /* Free up all the children before we remove this device */
1030 for (i = 0; i < USB_MAXCHILDREN; i++) {
1031 if (udev->children[i])
1032 usb_disconnect(&udev->children[i]);
1033 }
1034
1035 /* deallocate hcd/hardware state ... nuking all pending urbs and
1036 * cleaning up all state associated with the current configuration
1037 * so that the hardware is now fully quiesced.
1038 */
1039 usb_disable_device(udev, 0);
1040
1041 /* Free the device number, remove the /proc/bus/usb entry and
1042 * the sysfs attributes, and delete the parent's children[]
1043 * (or root_hub) pointer.
1044 */
1045 dev_dbg (&udev->dev, "unregistering device\n");
1046 release_address(udev);
1047 usbfs_remove_device(udev);
1048 usb_remove_sysfs_dev_files(udev);
1049
1050 /* Avoid races with recursively_mark_NOTATTACHED() */
1051 spin_lock_irq(&device_state_lock);
1052 *pdev = NULL;
1053 spin_unlock_irq(&device_state_lock);
1054
1055 if (!udev->parent) {
1056 usb_unlock_device(udev);
1057 up(&usb_bus_list_lock);
1058 } else
1059 up(&udev->serialize);
1060
1061 device_unregister(&udev->dev);
1062 }
1063
1064 static int choose_configuration(struct usb_device *udev)
1065 {
1066 int c, i;
1067
1068 /* NOTE: this should interact with hub power budgeting */
1069
1070 c = udev->config[0].desc.bConfigurationValue;
1071 if (udev->descriptor.bNumConfigurations != 1) {
1072 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1073 struct usb_interface_descriptor *desc;
1074
1075 /* heuristic: Linux is more likely to have class
1076 * drivers, so avoid vendor-specific interfaces.
1077 */
1078 desc = &udev->config[i].intf_cache[0]
1079 ->altsetting->desc;
1080 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1081 continue;
1082 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1083 * MSFT needs this to be the first config; never use
1084 * it as the default unless Linux has host-side RNDIS.
1085 * A second config would ideally be CDC-Ethernet, but
1086 * may instead be the "vendor specific" CDC subset
1087 * long used by ARM Linux for sa1100 or pxa255.
1088 */
1089 if (desc->bInterfaceClass == USB_CLASS_COMM
1090 && desc->bInterfaceSubClass == 2
1091 && desc->bInterfaceProtocol == 0xff) {
1092 c = udev->config[1].desc.bConfigurationValue;
1093 continue;
1094 }
1095 c = udev->config[i].desc.bConfigurationValue;
1096 break;
1097 }
1098 dev_info(&udev->dev,
1099 "configuration #%d chosen from %d choices\n",
1100 c, udev->descriptor.bNumConfigurations);
1101 }
1102 return c;
1103 }
1104
1105 #ifdef DEBUG
1106 static void show_string(struct usb_device *udev, char *id, char *string)
1107 {
1108 if (!string)
1109 return;
1110 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1111 }
1112
1113 #else
1114 static inline void show_string(struct usb_device *udev, char *id, char *string)
1115 {}
1116 #endif
1117
1118 static void get_string(struct usb_device *udev, char **string, int index)
1119 {
1120 char *buf;
1121
1122 if (!index)
1123 return;
1124 buf = kmalloc(256, GFP_KERNEL);
1125 if (!buf)
1126 return;
1127 if (usb_string(udev, index, buf, 256) > 0)
1128 *string = buf;
1129 else
1130 kfree(buf);
1131 }
1132
1133
1134 #ifdef CONFIG_USB_OTG
1135 #include "otg_whitelist.h"
1136 #endif
1137
1138 /**
1139 * usb_new_device - perform initial device setup (usbcore-internal)
1140 * @udev: newly addressed device (in ADDRESS state)
1141 *
1142 * This is called with devices which have been enumerated, but not yet
1143 * configured. The device descriptor is available, but not descriptors
1144 * for any device configuration. The caller must have locked udev and
1145 * either the parent hub (if udev is a normal device) or else the
1146 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1147 * udev has already been installed, but udev is not yet visible through
1148 * sysfs or other filesystem code.
1149 *
1150 * Returns 0 for success (device is configured and listed, with its
1151 * interfaces, in sysfs); else a negative errno value.
1152 *
1153 * This call is synchronous, and may not be used in an interrupt context.
1154 *
1155 * Only the hub driver should ever call this; root hub registration
1156 * uses it indirectly.
1157 */
1158 int usb_new_device(struct usb_device *udev)
1159 {
1160 int err;
1161 int c;
1162
1163 err = usb_get_configuration(udev);
1164 if (err < 0) {
1165 dev_err(&udev->dev, "can't read configurations, error %d\n",
1166 err);
1167 goto fail;
1168 }
1169
1170 /* read the standard strings and cache them if present */
1171 get_string(udev, &udev->product, udev->descriptor.iProduct);
1172 get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);
1173 get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);
1174
1175 /* Tell the world! */
1176 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1177 "SerialNumber=%d\n",
1178 udev->descriptor.iManufacturer,
1179 udev->descriptor.iProduct,
1180 udev->descriptor.iSerialNumber);
1181 show_string(udev, "Product", udev->product);
1182 show_string(udev, "Manufacturer", udev->manufacturer);
1183 show_string(udev, "SerialNumber", udev->serial);
1184
1185 #ifdef CONFIG_USB_OTG
1186 /*
1187 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1188 * to wake us after we've powered off VBUS; and HNP, switching roles
1189 * "host" to "peripheral". The OTG descriptor helps figure this out.
1190 */
1191 if (!udev->bus->is_b_host
1192 && udev->config
1193 && udev->parent == udev->bus->root_hub) {
1194 struct usb_otg_descriptor *desc = 0;
1195 struct usb_bus *bus = udev->bus;
1196
1197 /* descriptor may appear anywhere in config */
1198 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1199 le16_to_cpu(udev->config[0].desc.wTotalLength),
1200 USB_DT_OTG, (void **) &desc) == 0) {
1201 if (desc->bmAttributes & USB_OTG_HNP) {
1202 unsigned port1;
1203 struct usb_device *root = udev->parent;
1204
1205 for (port1 = 1; port1 <= root->maxchild;
1206 port1++) {
1207 if (root->children[port1-1] == udev)
1208 break;
1209 }
1210
1211 dev_info(&udev->dev,
1212 "Dual-Role OTG device on %sHNP port\n",
1213 (port1 == bus->otg_port)
1214 ? "" : "non-");
1215
1216 /* enable HNP before suspend, it's simpler */
1217 if (port1 == bus->otg_port)
1218 bus->b_hnp_enable = 1;
1219 err = usb_control_msg(udev,
1220 usb_sndctrlpipe(udev, 0),
1221 USB_REQ_SET_FEATURE, 0,
1222 bus->b_hnp_enable
1223 ? USB_DEVICE_B_HNP_ENABLE
1224 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1225 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1226 if (err < 0) {
1227 /* OTG MESSAGE: report errors here,
1228 * customize to match your product.
1229 */
1230 dev_info(&udev->dev,
1231 "can't set HNP mode; %d\n",
1232 err);
1233 bus->b_hnp_enable = 0;
1234 }
1235 }
1236 }
1237 }
1238
1239 if (!is_targeted(udev)) {
1240
1241 /* Maybe it can talk to us, though we can't talk to it.
1242 * (Includes HNP test device.)
1243 */
1244 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1245 static int __usb_suspend_device (struct usb_device *,
1246 int port1, pm_message_t state);
1247 err = __usb_suspend_device(udev,
1248 udev->bus->otg_port,
1249 PMSG_SUSPEND);
1250 if (err < 0)
1251 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1252 }
1253 err = -ENODEV;
1254 goto fail;
1255 }
1256 #endif
1257
1258 /* put device-specific files into sysfs */
1259 err = device_add (&udev->dev);
1260 if (err) {
1261 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1262 goto fail;
1263 }
1264 usb_create_sysfs_dev_files (udev);
1265
1266 /* choose and set the configuration. that registers the interfaces
1267 * with the driver core, and lets usb device drivers bind to them.
1268 */
1269 c = choose_configuration(udev);
1270 if (c < 0)
1271 dev_warn(&udev->dev,
1272 "can't choose an initial configuration\n");
1273 else {
1274 err = usb_set_configuration(udev, c);
1275 if (err) {
1276 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1277 c, err);
1278 usb_remove_sysfs_dev_files(udev);
1279 device_del(&udev->dev);
1280 goto fail;
1281 }
1282 }
1283
1284 /* USB device state == configured ... usable */
1285
1286 /* add a /proc/bus/usb entry */
1287 usbfs_add_device(udev);
1288 return 0;
1289
1290 fail:
1291 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1292 return err;
1293 }
1294
1295
1296 static int hub_port_status(struct usb_hub *hub, int port1,
1297 u16 *status, u16 *change)
1298 {
1299 int ret;
1300
1301 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1302 if (ret < 0)
1303 dev_err (hub->intfdev,
1304 "%s failed (err = %d)\n", __FUNCTION__, ret);
1305 else {
1306 *status = le16_to_cpu(hub->status->port.wPortStatus);
1307 *change = le16_to_cpu(hub->status->port.wPortChange);
1308 ret = 0;
1309 }
1310 return ret;
1311 }
1312
1313 #define PORT_RESET_TRIES 5
1314 #define SET_ADDRESS_TRIES 2
1315 #define GET_DESCRIPTOR_TRIES 2
1316 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1317 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1318
1319 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1320 #define HUB_SHORT_RESET_TIME 10
1321 #define HUB_LONG_RESET_TIME 200
1322 #define HUB_RESET_TIMEOUT 500
1323
1324 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1325 struct usb_device *udev, unsigned int delay)
1326 {
1327 int delay_time, ret;
1328 u16 portstatus;
1329 u16 portchange;
1330
1331 for (delay_time = 0;
1332 delay_time < HUB_RESET_TIMEOUT;
1333 delay_time += delay) {
1334 /* wait to give the device a chance to reset */
1335 msleep(delay);
1336
1337 /* read and decode port status */
1338 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1339 if (ret < 0)
1340 return ret;
1341
1342 /* Device went away? */
1343 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1344 return -ENOTCONN;
1345
1346 /* bomb out completely if something weird happened */
1347 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1348 return -EINVAL;
1349
1350 /* if we`ve finished resetting, then break out of the loop */
1351 if (!(portstatus & USB_PORT_STAT_RESET) &&
1352 (portstatus & USB_PORT_STAT_ENABLE)) {
1353 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1354 udev->speed = USB_SPEED_HIGH;
1355 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1356 udev->speed = USB_SPEED_LOW;
1357 else
1358 udev->speed = USB_SPEED_FULL;
1359 return 0;
1360 }
1361
1362 /* switch to the long delay after two short delay failures */
1363 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1364 delay = HUB_LONG_RESET_TIME;
1365
1366 dev_dbg (hub->intfdev,
1367 "port %d not reset yet, waiting %dms\n",
1368 port1, delay);
1369 }
1370
1371 return -EBUSY;
1372 }
1373
1374 static int hub_port_reset(struct usb_hub *hub, int port1,
1375 struct usb_device *udev, unsigned int delay)
1376 {
1377 int i, status;
1378
1379 /* Reset the port */
1380 for (i = 0; i < PORT_RESET_TRIES; i++) {
1381 status = set_port_feature(hub->hdev,
1382 port1, USB_PORT_FEAT_RESET);
1383 if (status)
1384 dev_err(hub->intfdev,
1385 "cannot reset port %d (err = %d)\n",
1386 port1, status);
1387 else {
1388 status = hub_port_wait_reset(hub, port1, udev, delay);
1389 if (status)
1390 dev_dbg(hub->intfdev,
1391 "port_wait_reset: err = %d\n",
1392 status);
1393 }
1394
1395 /* return on disconnect or reset */
1396 switch (status) {
1397 case 0:
1398 /* TRSTRCY = 10 ms */
1399 msleep(10);
1400 /* FALL THROUGH */
1401 case -ENOTCONN:
1402 case -ENODEV:
1403 clear_port_feature(hub->hdev,
1404 port1, USB_PORT_FEAT_C_RESET);
1405 /* FIXME need disconnect() for NOTATTACHED device */
1406 usb_set_device_state(udev, status
1407 ? USB_STATE_NOTATTACHED
1408 : USB_STATE_DEFAULT);
1409 return status;
1410 }
1411
1412 dev_dbg (hub->intfdev,
1413 "port %d not enabled, trying reset again...\n",
1414 port1);
1415 delay = HUB_LONG_RESET_TIME;
1416 }
1417
1418 dev_err (hub->intfdev,
1419 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1420 port1);
1421
1422 return status;
1423 }
1424
1425 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
1426 {
1427 struct usb_device *hdev = hub->hdev;
1428 int ret;
1429
1430 if (hdev->children[port1-1] && set_state) {
1431 usb_set_device_state(hdev->children[port1-1],
1432 USB_STATE_NOTATTACHED);
1433 }
1434 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
1435 if (ret)
1436 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
1437 port1, ret);
1438
1439 return ret;
1440 }
1441
1442 /*
1443 * Disable a port and mark a logical connnect-change event, so that some
1444 * time later khubd will disconnect() any existing usb_device on the port
1445 * and will re-enumerate if there actually is a device attached.
1446 */
1447 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1448 {
1449 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1450 hub_port_disable(hub, port1, 1);
1451
1452 /* FIXME let caller ask to power down the port:
1453 * - some devices won't enumerate without a VBUS power cycle
1454 * - SRP saves power that way
1455 * - usb_suspend_device(dev, PMSG_SUSPEND)
1456 * That's easy if this hub can switch power per-port, and
1457 * khubd reactivates the port later (timer, SRP, etc).
1458 * Powerdown must be optional, because of reset/DFU.
1459 */
1460
1461 set_bit(port1, hub->change_bits);
1462 kick_khubd(hub);
1463 }
1464
1465
1466 #ifdef CONFIG_USB_SUSPEND
1467
1468 /*
1469 * Selective port suspend reduces power; most suspended devices draw
1470 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1471 * All devices below the suspended port are also suspended.
1472 *
1473 * Devices leave suspend state when the host wakes them up. Some devices
1474 * also support "remote wakeup", where the device can activate the USB
1475 * tree above them to deliver data, such as a keypress or packet. In
1476 * some cases, this wakes the USB host.
1477 */
1478 static int hub_port_suspend(struct usb_hub *hub, int port1,
1479 struct usb_device *udev)
1480 {
1481 int status;
1482
1483 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1484
1485 /* enable remote wakeup when appropriate; this lets the device
1486 * wake up the upstream hub (including maybe the root hub).
1487 *
1488 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1489 * we don't explicitly enable it here.
1490 */
1491 if (udev->actconfig
1492 // && FIXME (remote wakeup enabled on this bus)
1493 // ... currently assuming it's always appropriate
1494 && (udev->actconfig->desc.bmAttributes
1495 & USB_CONFIG_ATT_WAKEUP) != 0) {
1496 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1497 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1498 USB_DEVICE_REMOTE_WAKEUP, 0,
1499 NULL, 0,
1500 USB_CTRL_SET_TIMEOUT);
1501 if (status)
1502 dev_dbg(&udev->dev,
1503 "won't remote wakeup, status %d\n",
1504 status);
1505 }
1506
1507 /* see 7.1.7.6 */
1508 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1509 if (status) {
1510 dev_dbg(hub->intfdev,
1511 "can't suspend port %d, status %d\n",
1512 port1, status);
1513 /* paranoia: "should not happen" */
1514 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1515 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1516 USB_DEVICE_REMOTE_WAKEUP, 0,
1517 NULL, 0,
1518 USB_CTRL_SET_TIMEOUT);
1519 } else {
1520 /* device has up to 10 msec to fully suspend */
1521 dev_dbg(&udev->dev, "usb suspend\n");
1522 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1523 msleep(10);
1524 }
1525 return status;
1526 }
1527
1528 /*
1529 * Devices on USB hub ports have only one "suspend" state, corresponding
1530 * to ACPI D2, "may cause the device to lose some context".
1531 * State transitions include:
1532 *
1533 * - suspend, resume ... when the VBUS power link stays live
1534 * - suspend, disconnect ... VBUS lost
1535 *
1536 * Once VBUS drop breaks the circuit, the port it's using has to go through
1537 * normal re-enumeration procedures, starting with enabling VBUS power.
1538 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1539 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1540 * timer, no SRP, no requests through sysfs.
1541 */
1542 static int __usb_suspend_device (struct usb_device *udev, int port1,
1543 pm_message_t state)
1544 {
1545 int status;
1546
1547 /* caller owns the udev device lock */
1548 if (port1 < 0)
1549 return port1;
1550
1551 if (udev->state == USB_STATE_SUSPENDED
1552 || udev->state == USB_STATE_NOTATTACHED) {
1553 return 0;
1554 }
1555
1556 /* suspend interface drivers; if this is a hub, it
1557 * suspends the child devices
1558 */
1559 if (udev->actconfig) {
1560 int i;
1561
1562 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1563 struct usb_interface *intf;
1564 struct usb_driver *driver;
1565
1566 intf = udev->actconfig->interface[i];
1567 if (state <= intf->dev.power.power_state)
1568 continue;
1569 if (!intf->dev.driver)
1570 continue;
1571 driver = to_usb_driver(intf->dev.driver);
1572
1573 if (driver->suspend) {
1574 status = driver->suspend(intf, state);
1575 if (intf->dev.power.power_state != state
1576 || status)
1577 dev_err(&intf->dev,
1578 "suspend %d fail, code %d\n",
1579 state, status);
1580 }
1581
1582 /* only drivers with suspend() can ever resume();
1583 * and after power loss, even they won't.
1584 * bus_rescan_devices() can rebind drivers later.
1585 *
1586 * FIXME the PM core self-deadlocks when unbinding
1587 * drivers during suspend/resume ... everything grabs
1588 * dpm_sem (not a spinlock, ugh). we want to unbind,
1589 * since we know every driver's probe/disconnect works
1590 * even for drivers that can't suspend.
1591 */
1592 if (!driver->suspend || state > PM_SUSPEND_MEM) {
1593 #if 1
1594 dev_warn(&intf->dev, "resume is unsafe!\n");
1595 #else
1596 down_write(&usb_bus_type.rwsem);
1597 device_release_driver(&intf->dev);
1598 up_write(&usb_bus_type.rwsem);
1599 #endif
1600 }
1601 }
1602 }
1603
1604 /*
1605 * FIXME this needs port power off call paths too, to help force
1606 * USB into the "generic" PM model. At least for devices on
1607 * ports that aren't using ganged switching (usually root hubs).
1608 *
1609 * NOTE: SRP-capable links should adopt more aggressive poweroff
1610 * policies (when HNP doesn't apply) once we have mechanisms to
1611 * turn power back on! (Likely not before 2.7...)
1612 */
1613 if (state > PM_SUSPEND_MEM) {
1614 dev_warn(&udev->dev, "no poweroff yet, suspending instead\n");
1615 }
1616
1617 /* "global suspend" of the HC-to-USB interface (root hub), or
1618 * "selective suspend" of just one hub-device link.
1619 */
1620 if (!udev->parent) {
1621 struct usb_bus *bus = udev->bus;
1622 if (bus && bus->op->hub_suspend) {
1623 status = bus->op->hub_suspend (bus);
1624 if (status == 0) {
1625 dev_dbg(&udev->dev, "usb suspend\n");
1626 usb_set_device_state(udev,
1627 USB_STATE_SUSPENDED);
1628 }
1629 } else
1630 status = -EOPNOTSUPP;
1631 } else
1632 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1633 udev);
1634
1635 if (status == 0)
1636 udev->dev.power.power_state = state;
1637 return status;
1638 }
1639
1640 /**
1641 * usb_suspend_device - suspend a usb device
1642 * @udev: device that's no longer in active use
1643 * @state: PMSG_SUSPEND to suspend
1644 * Context: must be able to sleep; device not locked
1645 *
1646 * Suspends a USB device that isn't in active use, conserving power.
1647 * Devices may wake out of a suspend, if anything important happens,
1648 * using the remote wakeup mechanism. They may also be taken out of
1649 * suspend by the host, using usb_resume_device(). It's also routine
1650 * to disconnect devices while they are suspended.
1651 *
1652 * Suspending OTG devices may trigger HNP, if that's been enabled
1653 * between a pair of dual-role devices. That will change roles, such
1654 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1655 *
1656 * Returns 0 on success, else negative errno.
1657 */
1658 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1659 {
1660 int port1, status;
1661
1662 port1 = locktree(udev);
1663 if (port1 < 0)
1664 return port1;
1665
1666 status = __usb_suspend_device(udev, port1, state);
1667 usb_unlock_device(udev);
1668 return status;
1669 }
1670
1671 /*
1672 * hardware resume signaling is finished, either because of selective
1673 * resume (by host) or remote wakeup (by device) ... now see what changed
1674 * in the tree that's rooted at this device.
1675 */
1676 static int finish_port_resume(struct usb_device *udev)
1677 {
1678 int status;
1679 u16 devstatus;
1680
1681 /* caller owns the udev device lock */
1682 dev_dbg(&udev->dev, "usb resume\n");
1683
1684 /* usb ch9 identifies four variants of SUSPENDED, based on what
1685 * state the device resumes to. Linux currently won't see the
1686 * first two on the host side; they'd be inside hub_port_init()
1687 * during many timeouts, but khubd can't suspend until later.
1688 */
1689 usb_set_device_state(udev, udev->actconfig
1690 ? USB_STATE_CONFIGURED
1691 : USB_STATE_ADDRESS);
1692 udev->dev.power.power_state = PMSG_ON;
1693
1694 /* 10.5.4.5 says be sure devices in the tree are still there.
1695 * For now let's assume the device didn't go crazy on resume,
1696 * and device drivers will know about any resume quirks.
1697 */
1698 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1699 if (status < 0)
1700 dev_dbg(&udev->dev,
1701 "gone after usb resume? status %d\n",
1702 status);
1703 else if (udev->actconfig) {
1704 unsigned i;
1705
1706 le16_to_cpus(&devstatus);
1707 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1708 status = usb_control_msg(udev,
1709 usb_sndctrlpipe(udev, 0),
1710 USB_REQ_CLEAR_FEATURE,
1711 USB_RECIP_DEVICE,
1712 USB_DEVICE_REMOTE_WAKEUP, 0,
1713 NULL, 0,
1714 USB_CTRL_SET_TIMEOUT);
1715 if (status) {
1716 dev_dbg(&udev->dev, "disable remote "
1717 "wakeup, status %d\n", status);
1718 status = 0;
1719 }
1720 }
1721
1722 /* resume interface drivers; if this is a hub, it
1723 * resumes the child devices
1724 */
1725 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1726 struct usb_interface *intf;
1727 struct usb_driver *driver;
1728
1729 intf = udev->actconfig->interface[i];
1730 if (intf->dev.power.power_state == PMSG_SUSPEND)
1731 continue;
1732 if (!intf->dev.driver) {
1733 /* FIXME maybe force to alt 0 */
1734 continue;
1735 }
1736 driver = to_usb_driver(intf->dev.driver);
1737
1738 /* bus_rescan_devices() may rebind drivers */
1739 if (!driver->resume)
1740 continue;
1741
1742 /* can we do better than just logging errors? */
1743 status = driver->resume(intf);
1744 if (intf->dev.power.power_state != PMSG_ON
1745 || status)
1746 dev_dbg(&intf->dev,
1747 "resume fail, state %d code %d\n",
1748 intf->dev.power.power_state, status);
1749 }
1750 status = 0;
1751
1752 } else if (udev->devnum <= 0) {
1753 dev_dbg(&udev->dev, "bogus resume!\n");
1754 status = -EINVAL;
1755 }
1756 return status;
1757 }
1758
1759 static int
1760 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1761 {
1762 int status;
1763
1764 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1765
1766 /* see 7.1.7.7; affects power usage, but not budgeting */
1767 status = clear_port_feature(hub->hdev,
1768 port1, USB_PORT_FEAT_SUSPEND);
1769 if (status) {
1770 dev_dbg(hub->intfdev,
1771 "can't resume port %d, status %d\n",
1772 port1, status);
1773 } else {
1774 u16 devstatus;
1775 u16 portchange;
1776
1777 /* drive resume for at least 20 msec */
1778 if (udev)
1779 dev_dbg(&udev->dev, "RESUME\n");
1780 msleep(25);
1781
1782 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1783 | USB_PORT_STAT_ENABLE \
1784 | USB_PORT_STAT_CONNECTION)
1785
1786 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1787 * stop resume signaling. Then finish the resume
1788 * sequence.
1789 */
1790 devstatus = portchange = 0;
1791 status = hub_port_status(hub, port1,
1792 &devstatus, &portchange);
1793 if (status < 0
1794 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1795 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1796 ) {
1797 dev_dbg(hub->intfdev,
1798 "port %d status %04x.%04x after resume, %d\n",
1799 port1, portchange, devstatus, status);
1800 } else {
1801 /* TRSMRCY = 10 msec */
1802 msleep(10);
1803 if (udev)
1804 status = finish_port_resume(udev);
1805 }
1806 }
1807 if (status < 0)
1808 hub_port_logical_disconnect(hub, port1);
1809
1810 return status;
1811 }
1812
1813 static int hub_resume (struct usb_interface *intf);
1814
1815 /**
1816 * usb_resume_device - re-activate a suspended usb device
1817 * @udev: device to re-activate
1818 * Context: must be able to sleep; device not locked
1819 *
1820 * This will re-activate the suspended device, increasing power usage
1821 * while letting drivers communicate again with its endpoints.
1822 * USB resume explicitly guarantees that the power session between
1823 * the host and the device is the same as it was when the device
1824 * suspended.
1825 *
1826 * Returns 0 on success, else negative errno.
1827 */
1828 int usb_resume_device(struct usb_device *udev)
1829 {
1830 int port1, status;
1831
1832 port1 = locktree(udev);
1833 if (port1 < 0)
1834 return port1;
1835
1836 /* "global resume" of the HC-to-USB interface (root hub), or
1837 * selective resume of one hub-to-device port
1838 */
1839 if (!udev->parent) {
1840 struct usb_bus *bus = udev->bus;
1841 if (bus && bus->op->hub_resume) {
1842 status = bus->op->hub_resume (bus);
1843 } else
1844 status = -EOPNOTSUPP;
1845 if (status == 0) {
1846 dev_dbg(&udev->dev, "usb resume\n");
1847 /* TRSMRCY = 10 msec */
1848 msleep(10);
1849 usb_set_device_state (udev, USB_STATE_CONFIGURED);
1850 udev->dev.power.power_state = PMSG_ON;
1851 status = hub_resume (udev
1852 ->actconfig->interface[0]);
1853 }
1854 } else if (udev->state == USB_STATE_SUSPENDED) {
1855 // NOTE this fails if parent is also suspended...
1856 status = hub_port_resume(hdev_to_hub(udev->parent),
1857 port1, udev);
1858 } else {
1859 status = 0;
1860 }
1861 if (status < 0) {
1862 dev_dbg(&udev->dev, "can't resume, status %d\n",
1863 status);
1864 }
1865
1866 usb_unlock_device(udev);
1867
1868 /* rebind drivers that had no suspend() */
1869 if (status == 0) {
1870 usb_lock_all_devices();
1871 bus_rescan_devices(&usb_bus_type);
1872 usb_unlock_all_devices();
1873 }
1874 return status;
1875 }
1876
1877 static int remote_wakeup(struct usb_device *udev)
1878 {
1879 int status = 0;
1880
1881 /* don't repeat RESUME sequence if this device
1882 * was already woken up by some other task
1883 */
1884 down(&udev->serialize);
1885 if (udev->state == USB_STATE_SUSPENDED) {
1886 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1887 /* TRSMRCY = 10 msec */
1888 msleep(10);
1889 status = finish_port_resume(udev);
1890 }
1891 up(&udev->serialize);
1892 return status;
1893 }
1894
1895 static int hub_suspend(struct usb_interface *intf, pm_message_t state)
1896 {
1897 struct usb_hub *hub = usb_get_intfdata (intf);
1898 struct usb_device *hdev = hub->hdev;
1899 unsigned port1;
1900 int status;
1901
1902 /* stop khubd and related activity */
1903 hub_quiesce(hub);
1904
1905 /* then suspend every port */
1906 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1907 struct usb_device *udev;
1908
1909 udev = hdev->children [port1-1];
1910 if (!udev)
1911 continue;
1912 down(&udev->serialize);
1913 status = __usb_suspend_device(udev, port1, state);
1914 up(&udev->serialize);
1915 if (status < 0)
1916 dev_dbg(&intf->dev, "suspend port %d --> %d\n",
1917 port1, status);
1918 }
1919
1920 intf->dev.power.power_state = state;
1921 return 0;
1922 }
1923
1924 static int hub_resume(struct usb_interface *intf)
1925 {
1926 struct usb_device *hdev = interface_to_usbdev(intf);
1927 struct usb_hub *hub = usb_get_intfdata (intf);
1928 unsigned port1;
1929 int status;
1930
1931 if (intf->dev.power.power_state == PM_SUSPEND_ON)
1932 return 0;
1933
1934 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1935 struct usb_device *udev;
1936 u16 portstat, portchange;
1937
1938 udev = hdev->children [port1-1];
1939 status = hub_port_status(hub, port1, &portstat, &portchange);
1940 if (status == 0) {
1941 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1942 clear_port_feature(hdev, port1,
1943 USB_PORT_FEAT_C_SUSPEND);
1944 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1945 }
1946
1947 /* let khubd handle disconnects etc */
1948 if (portchange)
1949 continue;
1950 }
1951
1952 if (!udev || status < 0)
1953 continue;
1954 down (&udev->serialize);
1955 if (portstat & USB_PORT_STAT_SUSPEND)
1956 status = hub_port_resume(hub, port1, udev);
1957 else {
1958 status = finish_port_resume(udev);
1959 if (status < 0) {
1960 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1961 port1, status);
1962 hub_port_logical_disconnect(hub, port1);
1963 }
1964 }
1965 up(&udev->serialize);
1966 }
1967 intf->dev.power.power_state = PMSG_ON;
1968
1969 hub->resume_root_hub = 0;
1970 hub_activate(hub);
1971 return 0;
1972 }
1973
1974 void usb_resume_root_hub(struct usb_device *hdev)
1975 {
1976 struct usb_hub *hub = hdev_to_hub(hdev);
1977
1978 hub->resume_root_hub = 1;
1979 kick_khubd(hub);
1980 }
1981
1982 #else /* !CONFIG_USB_SUSPEND */
1983
1984 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1985 {
1986 return 0;
1987 }
1988
1989 int usb_resume_device(struct usb_device *udev)
1990 {
1991 return 0;
1992 }
1993
1994 #define hub_suspend NULL
1995 #define hub_resume NULL
1996 #define remote_wakeup(x) 0
1997
1998 #endif /* CONFIG_USB_SUSPEND */
1999
2000 EXPORT_SYMBOL(usb_suspend_device);
2001 EXPORT_SYMBOL(usb_resume_device);
2002
2003
2004
2005 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2006 *
2007 * Between connect detection and reset signaling there must be a delay
2008 * of 100ms at least for debounce and power-settling. The corresponding
2009 * timer shall restart whenever the downstream port detects a disconnect.
2010 *
2011 * Apparently there are some bluetooth and irda-dongles and a number of
2012 * low-speed devices for which this debounce period may last over a second.
2013 * Not covered by the spec - but easy to deal with.
2014 *
2015 * This implementation uses a 1500ms total debounce timeout; if the
2016 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2017 * every 25ms for transient disconnects. When the port status has been
2018 * unchanged for 100ms it returns the port status.
2019 */
2020
2021 #define HUB_DEBOUNCE_TIMEOUT 1500
2022 #define HUB_DEBOUNCE_STEP 25
2023 #define HUB_DEBOUNCE_STABLE 100
2024
2025 static int hub_port_debounce(struct usb_hub *hub, int port1)
2026 {
2027 int ret;
2028 int total_time, stable_time = 0;
2029 u16 portchange, portstatus;
2030 unsigned connection = 0xffff;
2031
2032 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2033 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2034 if (ret < 0)
2035 return ret;
2036
2037 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2038 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2039 stable_time += HUB_DEBOUNCE_STEP;
2040 if (stable_time >= HUB_DEBOUNCE_STABLE)
2041 break;
2042 } else {
2043 stable_time = 0;
2044 connection = portstatus & USB_PORT_STAT_CONNECTION;
2045 }
2046
2047 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2048 clear_port_feature(hub->hdev, port1,
2049 USB_PORT_FEAT_C_CONNECTION);
2050 }
2051
2052 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2053 break;
2054 msleep(HUB_DEBOUNCE_STEP);
2055 }
2056
2057 dev_dbg (hub->intfdev,
2058 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2059 port1, total_time, stable_time, portstatus);
2060
2061 if (stable_time < HUB_DEBOUNCE_STABLE)
2062 return -ETIMEDOUT;
2063 return portstatus;
2064 }
2065
2066 static void ep0_reinit(struct usb_device *udev)
2067 {
2068 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2069 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2070 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2071 }
2072
2073 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2074 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2075
2076 static int hub_set_address(struct usb_device *udev)
2077 {
2078 int retval;
2079
2080 if (udev->devnum == 0)
2081 return -EINVAL;
2082 if (udev->state == USB_STATE_ADDRESS)
2083 return 0;
2084 if (udev->state != USB_STATE_DEFAULT)
2085 return -EINVAL;
2086 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2087 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2088 NULL, 0, USB_CTRL_SET_TIMEOUT);
2089 if (retval == 0) {
2090 usb_set_device_state(udev, USB_STATE_ADDRESS);
2091 ep0_reinit(udev);
2092 }
2093 return retval;
2094 }
2095
2096 /* Reset device, (re)assign address, get device descriptor.
2097 * Device connection must be stable, no more debouncing needed.
2098 * Returns device in USB_STATE_ADDRESS, except on error.
2099 *
2100 * If this is called for an already-existing device (as part of
2101 * usb_reset_device), the caller must own the device lock. For a
2102 * newly detected device that is not accessible through any global
2103 * pointers, it's not necessary to lock the device.
2104 */
2105 static int
2106 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2107 int retry_counter)
2108 {
2109 static DECLARE_MUTEX(usb_address0_sem);
2110
2111 struct usb_device *hdev = hub->hdev;
2112 int i, j, retval;
2113 unsigned delay = HUB_SHORT_RESET_TIME;
2114 enum usb_device_speed oldspeed = udev->speed;
2115
2116 /* root hub ports have a slightly longer reset period
2117 * (from USB 2.0 spec, section 7.1.7.5)
2118 */
2119 if (!hdev->parent) {
2120 delay = HUB_ROOT_RESET_TIME;
2121 if (port1 == hdev->bus->otg_port)
2122 hdev->bus->b_hnp_enable = 0;
2123 }
2124
2125 /* Some low speed devices have problems with the quick delay, so */
2126 /* be a bit pessimistic with those devices. RHbug #23670 */
2127 if (oldspeed == USB_SPEED_LOW)
2128 delay = HUB_LONG_RESET_TIME;
2129
2130 down(&usb_address0_sem);
2131
2132 /* Reset the device; full speed may morph to high speed */
2133 retval = hub_port_reset(hub, port1, udev, delay);
2134 if (retval < 0) /* error or disconnect */
2135 goto fail;
2136 /* success, speed is known */
2137 retval = -ENODEV;
2138
2139 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2140 dev_dbg(&udev->dev, "device reset changed speed!\n");
2141 goto fail;
2142 }
2143 oldspeed = udev->speed;
2144
2145 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2146 * it's fixed size except for full speed devices.
2147 */
2148 switch (udev->speed) {
2149 case USB_SPEED_HIGH: /* fixed at 64 */
2150 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2151 break;
2152 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2153 /* to determine the ep0 maxpacket size, try to read
2154 * the device descriptor to get bMaxPacketSize0 and
2155 * then correct our initial guess.
2156 */
2157 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2158 break;
2159 case USB_SPEED_LOW: /* fixed at 8 */
2160 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2161 break;
2162 default:
2163 goto fail;
2164 }
2165
2166 dev_info (&udev->dev,
2167 "%s %s speed USB device using %s and address %d\n",
2168 (udev->config) ? "reset" : "new",
2169 ({ char *speed; switch (udev->speed) {
2170 case USB_SPEED_LOW: speed = "low"; break;
2171 case USB_SPEED_FULL: speed = "full"; break;
2172 case USB_SPEED_HIGH: speed = "high"; break;
2173 default: speed = "?"; break;
2174 }; speed;}),
2175 udev->bus->controller->driver->name,
2176 udev->devnum);
2177
2178 /* Set up TT records, if needed */
2179 if (hdev->tt) {
2180 udev->tt = hdev->tt;
2181 udev->ttport = hdev->ttport;
2182 } else if (udev->speed != USB_SPEED_HIGH
2183 && hdev->speed == USB_SPEED_HIGH) {
2184 udev->tt = &hub->tt;
2185 udev->ttport = port1;
2186 }
2187
2188 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2189 * Because device hardware and firmware is sometimes buggy in
2190 * this area, and this is how Linux has done it for ages.
2191 * Change it cautiously.
2192 *
2193 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2194 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2195 * so it may help with some non-standards-compliant devices.
2196 * Otherwise we start with SET_ADDRESS and then try to read the
2197 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2198 * value.
2199 */
2200 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2201 if (USE_NEW_SCHEME(retry_counter)) {
2202 struct usb_device_descriptor *buf;
2203 int r = 0;
2204
2205 #define GET_DESCRIPTOR_BUFSIZE 64
2206 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2207 if (!buf) {
2208 retval = -ENOMEM;
2209 continue;
2210 }
2211
2212 /* Use a short timeout the first time through,
2213 * so that recalcitrant full-speed devices with
2214 * 8- or 16-byte ep0-maxpackets won't slow things
2215 * down tremendously by NAKing the unexpectedly
2216 * early status stage. Also, retry on all errors;
2217 * some devices are flakey.
2218 */
2219 for (j = 0; j < 3; ++j) {
2220 buf->bMaxPacketSize0 = 0;
2221 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2222 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2223 USB_DT_DEVICE << 8, 0,
2224 buf, GET_DESCRIPTOR_BUFSIZE,
2225 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2226 switch (buf->bMaxPacketSize0) {
2227 case 8: case 16: case 32: case 64:
2228 if (buf->bDescriptorType ==
2229 USB_DT_DEVICE) {
2230 r = 0;
2231 break;
2232 }
2233 /* FALL THROUGH */
2234 default:
2235 if (r == 0)
2236 r = -EPROTO;
2237 break;
2238 }
2239 if (r == 0)
2240 break;
2241 }
2242 udev->descriptor.bMaxPacketSize0 =
2243 buf->bMaxPacketSize0;
2244 kfree(buf);
2245
2246 retval = hub_port_reset(hub, port1, udev, delay);
2247 if (retval < 0) /* error or disconnect */
2248 goto fail;
2249 if (oldspeed != udev->speed) {
2250 dev_dbg(&udev->dev,
2251 "device reset changed speed!\n");
2252 retval = -ENODEV;
2253 goto fail;
2254 }
2255 if (r) {
2256 dev_err(&udev->dev, "device descriptor "
2257 "read/%s, error %d\n",
2258 "64", r);
2259 retval = -EMSGSIZE;
2260 continue;
2261 }
2262 #undef GET_DESCRIPTOR_BUFSIZE
2263 }
2264
2265 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2266 retval = hub_set_address(udev);
2267 if (retval >= 0)
2268 break;
2269 msleep(200);
2270 }
2271 if (retval < 0) {
2272 dev_err(&udev->dev,
2273 "device not accepting address %d, error %d\n",
2274 udev->devnum, retval);
2275 goto fail;
2276 }
2277
2278 /* cope with hardware quirkiness:
2279 * - let SET_ADDRESS settle, some device hardware wants it
2280 * - read ep0 maxpacket even for high and low speed,
2281 */
2282 msleep(10);
2283 if (USE_NEW_SCHEME(retry_counter))
2284 break;
2285
2286 retval = usb_get_device_descriptor(udev, 8);
2287 if (retval < 8) {
2288 dev_err(&udev->dev, "device descriptor "
2289 "read/%s, error %d\n",
2290 "8", retval);
2291 if (retval >= 0)
2292 retval = -EMSGSIZE;
2293 } else {
2294 retval = 0;
2295 break;
2296 }
2297 }
2298 if (retval)
2299 goto fail;
2300
2301 i = udev->descriptor.bMaxPacketSize0;
2302 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2303 if (udev->speed != USB_SPEED_FULL ||
2304 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2305 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2306 retval = -EMSGSIZE;
2307 goto fail;
2308 }
2309 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2310 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2311 ep0_reinit(udev);
2312 }
2313
2314 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2315 if (retval < (signed)sizeof(udev->descriptor)) {
2316 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2317 "all", retval);
2318 if (retval >= 0)
2319 retval = -ENOMSG;
2320 goto fail;
2321 }
2322
2323 retval = 0;
2324
2325 fail:
2326 if (retval)
2327 hub_port_disable(hub, port1, 0);
2328 up(&usb_address0_sem);
2329 return retval;
2330 }
2331
2332 static void
2333 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2334 {
2335 struct usb_qualifier_descriptor *qual;
2336 int status;
2337
2338 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2339 if (qual == NULL)
2340 return;
2341
2342 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2343 qual, sizeof *qual);
2344 if (status == sizeof *qual) {
2345 dev_info(&udev->dev, "not running at top speed; "
2346 "connect to a high speed hub\n");
2347 /* hub LEDs are probably harder to miss than syslog */
2348 if (hub->has_indicators) {
2349 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2350 schedule_work (&hub->leds);
2351 }
2352 }
2353 kfree(qual);
2354 }
2355
2356 static unsigned
2357 hub_power_remaining (struct usb_hub *hub)
2358 {
2359 struct usb_device *hdev = hub->hdev;
2360 int remaining;
2361 unsigned i;
2362
2363 remaining = hub->power_budget;
2364 if (!remaining) /* self-powered */
2365 return 0;
2366
2367 for (i = 0; i < hdev->maxchild; i++) {
2368 struct usb_device *udev = hdev->children[i];
2369 int delta, ceiling;
2370
2371 if (!udev)
2372 continue;
2373
2374 /* 100mA per-port ceiling, or 8mA for OTG ports */
2375 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2376 ceiling = 50;
2377 else
2378 ceiling = 4;
2379
2380 if (udev->actconfig)
2381 delta = udev->actconfig->desc.bMaxPower;
2382 else
2383 delta = ceiling;
2384 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2385 if (delta > ceiling)
2386 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2387 2 * (delta - ceiling), 2 * ceiling);
2388 remaining -= delta;
2389 }
2390 if (remaining < 0) {
2391 dev_warn(hub->intfdev,
2392 "%dmA over power budget!\n",
2393 -2 * remaining);
2394 remaining = 0;
2395 }
2396 return remaining;
2397 }
2398
2399 /* Handle physical or logical connection change events.
2400 * This routine is called when:
2401 * a port connection-change occurs;
2402 * a port enable-change occurs (often caused by EMI);
2403 * usb_reset_device() encounters changed descriptors (as from
2404 * a firmware download)
2405 * caller already locked the hub
2406 */
2407 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2408 u16 portstatus, u16 portchange)
2409 {
2410 struct usb_device *hdev = hub->hdev;
2411 struct device *hub_dev = hub->intfdev;
2412 int status, i;
2413
2414 dev_dbg (hub_dev,
2415 "port %d, status %04x, change %04x, %s\n",
2416 port1, portstatus, portchange, portspeed (portstatus));
2417
2418 if (hub->has_indicators) {
2419 set_port_led(hub, port1, HUB_LED_AUTO);
2420 hub->indicator[port1-1] = INDICATOR_AUTO;
2421 }
2422
2423 /* Disconnect any existing devices under this port */
2424 if (hdev->children[port1-1])
2425 usb_disconnect(&hdev->children[port1-1]);
2426 clear_bit(port1, hub->change_bits);
2427
2428 #ifdef CONFIG_USB_OTG
2429 /* during HNP, don't repeat the debounce */
2430 if (hdev->bus->is_b_host)
2431 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2432 #endif
2433
2434 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2435 status = hub_port_debounce(hub, port1);
2436 if (status < 0) {
2437 dev_err (hub_dev,
2438 "connect-debounce failed, port %d disabled\n",
2439 port1);
2440 goto done;
2441 }
2442 portstatus = status;
2443 }
2444
2445 /* Return now if nothing is connected */
2446 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2447
2448 /* maybe switch power back on (e.g. root hub was reset) */
2449 if ((hub->descriptor->wHubCharacteristics
2450 & HUB_CHAR_LPSM) < 2
2451 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2452 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2453
2454 if (portstatus & USB_PORT_STAT_ENABLE)
2455 goto done;
2456 return;
2457 }
2458
2459 #ifdef CONFIG_USB_SUSPEND
2460 /* If something is connected, but the port is suspended, wake it up. */
2461 if (portstatus & USB_PORT_STAT_SUSPEND) {
2462 status = hub_port_resume(hub, port1, NULL);
2463 if (status < 0) {
2464 dev_dbg(hub_dev,
2465 "can't clear suspend on port %d; %d\n",
2466 port1, status);
2467 goto done;
2468 }
2469 }
2470 #endif
2471
2472 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2473 struct usb_device *udev;
2474
2475 /* reallocate for each attempt, since references
2476 * to the previous one can escape in various ways
2477 */
2478 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2479 if (!udev) {
2480 dev_err (hub_dev,
2481 "couldn't allocate port %d usb_device\n",
2482 port1);
2483 goto done;
2484 }
2485
2486 usb_set_device_state(udev, USB_STATE_POWERED);
2487 udev->speed = USB_SPEED_UNKNOWN;
2488
2489 /* set the address */
2490 choose_address(udev);
2491 if (udev->devnum <= 0) {
2492 status = -ENOTCONN; /* Don't retry */
2493 goto loop;
2494 }
2495
2496 /* reset and get descriptor */
2497 status = hub_port_init(hub, udev, port1, i);
2498 if (status < 0)
2499 goto loop;
2500
2501 /* consecutive bus-powered hubs aren't reliable; they can
2502 * violate the voltage drop budget. if the new child has
2503 * a "powered" LED, users should notice we didn't enable it
2504 * (without reading syslog), even without per-port LEDs
2505 * on the parent.
2506 */
2507 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2508 && hub->power_budget) {
2509 u16 devstat;
2510
2511 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2512 &devstat);
2513 if (status < 0) {
2514 dev_dbg(&udev->dev, "get status %d ?\n", status);
2515 goto loop_disable;
2516 }
2517 cpu_to_le16s(&devstat);
2518 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2519 dev_err(&udev->dev,
2520 "can't connect bus-powered hub "
2521 "to this port\n");
2522 if (hub->has_indicators) {
2523 hub->indicator[port1-1] =
2524 INDICATOR_AMBER_BLINK;
2525 schedule_work (&hub->leds);
2526 }
2527 status = -ENOTCONN; /* Don't retry */
2528 goto loop_disable;
2529 }
2530 }
2531
2532 /* check for devices running slower than they could */
2533 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2534 && udev->speed == USB_SPEED_FULL
2535 && highspeed_hubs != 0)
2536 check_highspeed (hub, udev, port1);
2537
2538 /* Store the parent's children[] pointer. At this point
2539 * udev becomes globally accessible, although presumably
2540 * no one will look at it until hdev is unlocked.
2541 */
2542 down (&udev->serialize);
2543 status = 0;
2544
2545 /* We mustn't add new devices if the parent hub has
2546 * been disconnected; we would race with the
2547 * recursively_mark_NOTATTACHED() routine.
2548 */
2549 spin_lock_irq(&device_state_lock);
2550 if (hdev->state == USB_STATE_NOTATTACHED)
2551 status = -ENOTCONN;
2552 else
2553 hdev->children[port1-1] = udev;
2554 spin_unlock_irq(&device_state_lock);
2555
2556 /* Run it through the hoops (find a driver, etc) */
2557 if (!status) {
2558 status = usb_new_device(udev);
2559 if (status) {
2560 spin_lock_irq(&device_state_lock);
2561 hdev->children[port1-1] = NULL;
2562 spin_unlock_irq(&device_state_lock);
2563 }
2564 }
2565
2566 up (&udev->serialize);
2567 if (status)
2568 goto loop_disable;
2569
2570 status = hub_power_remaining(hub);
2571 if (status)
2572 dev_dbg(hub_dev,
2573 "%dmA power budget left\n",
2574 2 * status);
2575
2576 return;
2577
2578 loop_disable:
2579 hub_port_disable(hub, port1, 1);
2580 loop:
2581 ep0_reinit(udev);
2582 release_address(udev);
2583 usb_put_dev(udev);
2584 if (status == -ENOTCONN)
2585 break;
2586 }
2587
2588 done:
2589 hub_port_disable(hub, port1, 1);
2590 }
2591
2592 static void hub_events(void)
2593 {
2594 struct list_head *tmp;
2595 struct usb_device *hdev;
2596 struct usb_interface *intf;
2597 struct usb_hub *hub;
2598 struct device *hub_dev;
2599 u16 hubstatus;
2600 u16 hubchange;
2601 u16 portstatus;
2602 u16 portchange;
2603 int i, ret;
2604 int connect_change;
2605
2606 /*
2607 * We restart the list every time to avoid a deadlock with
2608 * deleting hubs downstream from this one. This should be
2609 * safe since we delete the hub from the event list.
2610 * Not the most efficient, but avoids deadlocks.
2611 */
2612 while (1) {
2613
2614 /* Grab the first entry at the beginning of the list */
2615 spin_lock_irq(&hub_event_lock);
2616 if (list_empty(&hub_event_list)) {
2617 spin_unlock_irq(&hub_event_lock);
2618 break;
2619 }
2620
2621 tmp = hub_event_list.next;
2622 list_del_init(tmp);
2623
2624 hub = list_entry(tmp, struct usb_hub, event_list);
2625 hdev = hub->hdev;
2626 intf = to_usb_interface(hub->intfdev);
2627 hub_dev = &intf->dev;
2628
2629 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2630 hdev->state, hub->descriptor
2631 ? hub->descriptor->bNbrPorts
2632 : 0,
2633 /* NOTE: expects max 15 ports... */
2634 (u16) hub->change_bits[0],
2635 (u16) hub->event_bits[0]);
2636
2637 usb_get_intf(intf);
2638 i = hub->resume_root_hub;
2639 spin_unlock_irq(&hub_event_lock);
2640
2641 /* Is this is a root hub wanting to be resumed? */
2642 if (i)
2643 usb_resume_device(hdev);
2644
2645 /* Lock the device, then check to see if we were
2646 * disconnected while waiting for the lock to succeed. */
2647 if (locktree(hdev) < 0) {
2648 usb_put_intf(intf);
2649 continue;
2650 }
2651 if (hub != usb_get_intfdata(intf))
2652 goto loop;
2653
2654 /* If the hub has died, clean up after it */
2655 if (hdev->state == USB_STATE_NOTATTACHED) {
2656 hub_pre_reset(hub);
2657 goto loop;
2658 }
2659
2660 /* If this is an inactive or suspended hub, do nothing */
2661 if (hub->quiescing)
2662 goto loop;
2663
2664 if (hub->error) {
2665 dev_dbg (hub_dev, "resetting for error %d\n",
2666 hub->error);
2667
2668 ret = usb_reset_device(hdev);
2669 if (ret) {
2670 dev_dbg (hub_dev,
2671 "error resetting hub: %d\n", ret);
2672 goto loop;
2673 }
2674
2675 hub->nerrors = 0;
2676 hub->error = 0;
2677 }
2678
2679 /* deal with port status changes */
2680 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2681 if (test_bit(i, hub->busy_bits))
2682 continue;
2683 connect_change = test_bit(i, hub->change_bits);
2684 if (!test_and_clear_bit(i, hub->event_bits) &&
2685 !connect_change && !hub->activating)
2686 continue;
2687
2688 ret = hub_port_status(hub, i,
2689 &portstatus, &portchange);
2690 if (ret < 0)
2691 continue;
2692
2693 if (hub->activating && !hdev->children[i-1] &&
2694 (portstatus &
2695 USB_PORT_STAT_CONNECTION))
2696 connect_change = 1;
2697
2698 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2699 clear_port_feature(hdev, i,
2700 USB_PORT_FEAT_C_CONNECTION);
2701 connect_change = 1;
2702 }
2703
2704 if (portchange & USB_PORT_STAT_C_ENABLE) {
2705 if (!connect_change)
2706 dev_dbg (hub_dev,
2707 "port %d enable change, "
2708 "status %08x\n",
2709 i, portstatus);
2710 clear_port_feature(hdev, i,
2711 USB_PORT_FEAT_C_ENABLE);
2712
2713 /*
2714 * EM interference sometimes causes badly
2715 * shielded USB devices to be shutdown by
2716 * the hub, this hack enables them again.
2717 * Works at least with mouse driver.
2718 */
2719 if (!(portstatus & USB_PORT_STAT_ENABLE)
2720 && !connect_change
2721 && hdev->children[i-1]) {
2722 dev_err (hub_dev,
2723 "port %i "
2724 "disabled by hub (EMI?), "
2725 "re-enabling...\n",
2726 i);
2727 connect_change = 1;
2728 }
2729 }
2730
2731 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2732 clear_port_feature(hdev, i,
2733 USB_PORT_FEAT_C_SUSPEND);
2734 if (hdev->children[i-1]) {
2735 ret = remote_wakeup(hdev->
2736 children[i-1]);
2737 if (ret < 0)
2738 connect_change = 1;
2739 } else {
2740 ret = -ENODEV;
2741 hub_port_disable(hub, i, 1);
2742 }
2743 dev_dbg (hub_dev,
2744 "resume on port %d, status %d\n",
2745 i, ret);
2746 }
2747
2748 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2749 dev_err (hub_dev,
2750 "over-current change on port %d\n",
2751 i);
2752 clear_port_feature(hdev, i,
2753 USB_PORT_FEAT_C_OVER_CURRENT);
2754 hub_power_on(hub);
2755 }
2756
2757 if (portchange & USB_PORT_STAT_C_RESET) {
2758 dev_dbg (hub_dev,
2759 "reset change on port %d\n",
2760 i);
2761 clear_port_feature(hdev, i,
2762 USB_PORT_FEAT_C_RESET);
2763 }
2764
2765 if (connect_change)
2766 hub_port_connect_change(hub, i,
2767 portstatus, portchange);
2768 } /* end for i */
2769
2770 /* deal with hub status changes */
2771 if (test_and_clear_bit(0, hub->event_bits) == 0)
2772 ; /* do nothing */
2773 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2774 dev_err (hub_dev, "get_hub_status failed\n");
2775 else {
2776 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2777 dev_dbg (hub_dev, "power change\n");
2778 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2779 }
2780 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2781 dev_dbg (hub_dev, "overcurrent change\n");
2782 msleep(500); /* Cool down */
2783 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2784 hub_power_on(hub);
2785 }
2786 }
2787
2788 hub->activating = 0;
2789
2790 loop:
2791 usb_unlock_device(hdev);
2792 usb_put_intf(intf);
2793
2794 } /* end while (1) */
2795 }
2796
2797 static int hub_thread(void *__unused)
2798 {
2799 /*
2800 * This thread doesn't need any user-level access,
2801 * so get rid of all our resources
2802 */
2803
2804 daemonize("khubd");
2805 allow_signal(SIGKILL);
2806
2807 /* Send me a signal to get me die (for debugging) */
2808 do {
2809 hub_events();
2810 wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
2811 try_to_freeze(PF_FREEZE);
2812 } while (!signal_pending(current));
2813
2814 pr_debug ("%s: khubd exiting\n", usbcore_name);
2815 complete_and_exit(&khubd_exited, 0);
2816 }
2817
2818 static struct usb_device_id hub_id_table [] = {
2819 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2820 .bDeviceClass = USB_CLASS_HUB},
2821 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2822 .bInterfaceClass = USB_CLASS_HUB},
2823 { } /* Terminating entry */
2824 };
2825
2826 MODULE_DEVICE_TABLE (usb, hub_id_table);
2827
2828 static struct usb_driver hub_driver = {
2829 .owner = THIS_MODULE,
2830 .name = "hub",
2831 .probe = hub_probe,
2832 .disconnect = hub_disconnect,
2833 .suspend = hub_suspend,
2834 .resume = hub_resume,
2835 .ioctl = hub_ioctl,
2836 .id_table = hub_id_table,
2837 };
2838
2839 int usb_hub_init(void)
2840 {
2841 pid_t pid;
2842
2843 if (usb_register(&hub_driver) < 0) {
2844 printk(KERN_ERR "%s: can't register hub driver\n",
2845 usbcore_name);
2846 return -1;
2847 }
2848
2849 pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
2850 if (pid >= 0) {
2851 khubd_pid = pid;
2852
2853 return 0;
2854 }
2855
2856 /* Fall through if kernel_thread failed */
2857 usb_deregister(&hub_driver);
2858 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2859
2860 return -1;
2861 }
2862
2863 void usb_hub_cleanup(void)
2864 {
2865 int ret;
2866
2867 /* Kill the thread */
2868 ret = kill_proc(khubd_pid, SIGKILL, 1);
2869
2870 wait_for_completion(&khubd_exited);
2871
2872 /*
2873 * Hub resources are freed for us by usb_deregister. It calls
2874 * usb_driver_purge on every device which in turn calls that
2875 * devices disconnect function if it is using this driver.
2876 * The hub_disconnect function takes care of releasing the
2877 * individual hub resources. -greg
2878 */
2879 usb_deregister(&hub_driver);
2880 } /* usb_hub_cleanup() */
2881
2882
2883 static int config_descriptors_changed(struct usb_device *udev)
2884 {
2885 unsigned index;
2886 unsigned len = 0;
2887 struct usb_config_descriptor *buf;
2888
2889 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2890 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2891 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2892 }
2893 buf = kmalloc (len, SLAB_KERNEL);
2894 if (buf == NULL) {
2895 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2896 /* assume the worst */
2897 return 1;
2898 }
2899 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2900 int length;
2901 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2902
2903 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2904 old_length);
2905 if (length < old_length) {
2906 dev_dbg(&udev->dev, "config index %d, error %d\n",
2907 index, length);
2908 break;
2909 }
2910 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2911 != 0) {
2912 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2913 index, buf->bConfigurationValue);
2914 break;
2915 }
2916 }
2917 kfree(buf);
2918 return index != udev->descriptor.bNumConfigurations;
2919 }
2920
2921 /**
2922 * usb_reset_device - perform a USB port reset to reinitialize a device
2923 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2924 *
2925 * WARNING - don't reset any device unless drivers for all of its
2926 * interfaces are expecting that reset! Maybe some driver->reset()
2927 * method should eventually help ensure sufficient cooperation.
2928 *
2929 * Do a port reset, reassign the device's address, and establish its
2930 * former operating configuration. If the reset fails, or the device's
2931 * descriptors change from their values before the reset, or the original
2932 * configuration and altsettings cannot be restored, a flag will be set
2933 * telling khubd to pretend the device has been disconnected and then
2934 * re-connected. All drivers will be unbound, and the device will be
2935 * re-enumerated and probed all over again.
2936 *
2937 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2938 * flagged for logical disconnection, or some other negative error code
2939 * if the reset wasn't even attempted.
2940 *
2941 * The caller must own the device lock. For example, it's safe to use
2942 * this from a driver probe() routine after downloading new firmware.
2943 * For calls that might not occur during probe(), drivers should lock
2944 * the device using usb_lock_device_for_reset().
2945 */
2946 int usb_reset_device(struct usb_device *udev)
2947 {
2948 struct usb_device *parent_hdev = udev->parent;
2949 struct usb_hub *parent_hub;
2950 struct usb_device_descriptor descriptor = udev->descriptor;
2951 struct usb_hub *hub = NULL;
2952 int i, ret = 0, port1 = -1;
2953
2954 if (udev->state == USB_STATE_NOTATTACHED ||
2955 udev->state == USB_STATE_SUSPENDED) {
2956 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2957 udev->state);
2958 return -EINVAL;
2959 }
2960
2961 if (!parent_hdev) {
2962 /* this requires hcd-specific logic; see OHCI hc_restart() */
2963 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2964 return -EISDIR;
2965 }
2966
2967 for (i = 0; i < parent_hdev->maxchild; i++)
2968 if (parent_hdev->children[i] == udev) {
2969 port1 = i + 1;
2970 break;
2971 }
2972
2973 if (port1 < 0) {
2974 /* If this ever happens, it's very bad */
2975 dev_err(&udev->dev, "Can't locate device's port!\n");
2976 return -ENOENT;
2977 }
2978 parent_hub = hdev_to_hub(parent_hdev);
2979
2980 /* If we're resetting an active hub, take some special actions */
2981 if (udev->actconfig &&
2982 udev->actconfig->interface[0]->dev.driver ==
2983 &hub_driver.driver &&
2984 (hub = hdev_to_hub(udev)) != NULL) {
2985 hub_pre_reset(hub);
2986 }
2987
2988 set_bit(port1, parent_hub->busy_bits);
2989 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2990
2991 /* ep0 maxpacket size may change; let the HCD know about it.
2992 * Other endpoints will be handled by re-enumeration. */
2993 ep0_reinit(udev);
2994 ret = hub_port_init(parent_hub, udev, port1, i);
2995 if (ret >= 0)
2996 break;
2997 }
2998 clear_bit(port1, parent_hub->busy_bits);
2999 if (ret < 0)
3000 goto re_enumerate;
3001
3002 /* Device might have changed firmware (DFU or similar) */
3003 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3004 || config_descriptors_changed (udev)) {
3005 dev_info(&udev->dev, "device firmware changed\n");
3006 udev->descriptor = descriptor; /* for disconnect() calls */
3007 goto re_enumerate;
3008 }
3009
3010 if (!udev->actconfig)
3011 goto done;
3012
3013 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3014 USB_REQ_SET_CONFIGURATION, 0,
3015 udev->actconfig->desc.bConfigurationValue, 0,
3016 NULL, 0, USB_CTRL_SET_TIMEOUT);
3017 if (ret < 0) {
3018 dev_err(&udev->dev,
3019 "can't restore configuration #%d (error=%d)\n",
3020 udev->actconfig->desc.bConfigurationValue, ret);
3021 goto re_enumerate;
3022 }
3023 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3024
3025 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3026 struct usb_interface *intf = udev->actconfig->interface[i];
3027 struct usb_interface_descriptor *desc;
3028
3029 /* set_interface resets host side toggle even
3030 * for altsetting zero. the interface may have no driver.
3031 */
3032 desc = &intf->cur_altsetting->desc;
3033 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3034 desc->bAlternateSetting);
3035 if (ret < 0) {
3036 dev_err(&udev->dev, "failed to restore interface %d "
3037 "altsetting %d (error=%d)\n",
3038 desc->bInterfaceNumber,
3039 desc->bAlternateSetting,
3040 ret);
3041 goto re_enumerate;
3042 }
3043 }
3044
3045 done:
3046 if (hub)
3047 hub_post_reset(hub);
3048 return 0;
3049
3050 re_enumerate:
3051 hub_port_logical_disconnect(parent_hub, port1);
3052 return -ENODEV;
3053 }
linux v2.6.22.y-op