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[CONNECTOR]: async connector mode.
[linux-2.6/verdex.git] / drivers / usb / core / hub.c
bloba12cab5314e98720fb87b78c05a542789c53f395
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 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
439
440 /* if hub supports power switching, enable power on each port */
441 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
442 dev_dbg(hub->intfdev, "enabling power on all ports\n");
443 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
444 set_port_feature(hub->hdev, port1,
445 USB_PORT_FEAT_POWER);
446 }
447
448 /* Wait at least 100 msec for power to become stable */
449 msleep(max(pgood_delay, (unsigned) 100));
450 }
451
452 static void hub_quiesce(struct usb_hub *hub)
453 {
454 /* stop khubd and related activity */
455 hub->quiescing = 1;
456 usb_kill_urb(hub->urb);
457 if (hub->has_indicators)
458 cancel_delayed_work(&hub->leds);
459 if (hub->has_indicators || hub->tt.hub)
460 flush_scheduled_work();
461 }
462
463 static void hub_activate(struct usb_hub *hub)
464 {
465 int status;
466
467 hub->quiescing = 0;
468 hub->activating = 1;
469 status = usb_submit_urb(hub->urb, GFP_NOIO);
470 if (status < 0)
471 dev_err(hub->intfdev, "activate --> %d\n", status);
472 if (hub->has_indicators && blinkenlights)
473 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
474
475 /* scan all ports ASAP */
476 kick_khubd(hub);
477 }
478
479 static int hub_hub_status(struct usb_hub *hub,
480 u16 *status, u16 *change)
481 {
482 int ret;
483
484 ret = get_hub_status(hub->hdev, &hub->status->hub);
485 if (ret < 0)
486 dev_err (hub->intfdev,
487 "%s failed (err = %d)\n", __FUNCTION__, ret);
488 else {
489 *status = le16_to_cpu(hub->status->hub.wHubStatus);
490 *change = le16_to_cpu(hub->status->hub.wHubChange);
491 ret = 0;
492 }
493 return ret;
494 }
495
496 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
497 {
498 struct usb_device *hdev = hub->hdev;
499 int ret;
500
501 if (hdev->children[port1-1] && set_state) {
502 usb_set_device_state(hdev->children[port1-1],
503 USB_STATE_NOTATTACHED);
504 }
505 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
506 if (ret)
507 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
508 port1, ret);
509
510 return ret;
511 }
512
513 static int hub_configure(struct usb_hub *hub,
514 struct usb_endpoint_descriptor *endpoint)
515 {
516 struct usb_device *hdev = hub->hdev;
517 struct device *hub_dev = hub->intfdev;
518 u16 hubstatus, hubchange;
519 unsigned int pipe;
520 int maxp, ret;
521 char *message;
522
523 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
524 &hub->buffer_dma);
525 if (!hub->buffer) {
526 message = "can't allocate hub irq buffer";
527 ret = -ENOMEM;
528 goto fail;
529 }
530
531 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
532 if (!hub->status) {
533 message = "can't kmalloc hub status buffer";
534 ret = -ENOMEM;
535 goto fail;
536 }
537
538 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
539 if (!hub->descriptor) {
540 message = "can't kmalloc hub descriptor";
541 ret = -ENOMEM;
542 goto fail;
543 }
544
545 /* Request the entire hub descriptor.
546 * hub->descriptor can handle USB_MAXCHILDREN ports,
547 * but the hub can/will return fewer bytes here.
548 */
549 ret = get_hub_descriptor(hdev, hub->descriptor,
550 sizeof(*hub->descriptor));
551 if (ret < 0) {
552 message = "can't read hub descriptor";
553 goto fail;
554 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
555 message = "hub has too many ports!";
556 ret = -ENODEV;
557 goto fail;
558 }
559
560 hdev->maxchild = hub->descriptor->bNbrPorts;
561 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
562 (hdev->maxchild == 1) ? "" : "s");
563
564 le16_to_cpus(&hub->descriptor->wHubCharacteristics);
565
566 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
567 int i;
568 char portstr [USB_MAXCHILDREN + 1];
569
570 for (i = 0; i < hdev->maxchild; i++)
571 portstr[i] = hub->descriptor->DeviceRemovable
572 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
573 ? 'F' : 'R';
574 portstr[hdev->maxchild] = 0;
575 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
576 } else
577 dev_dbg(hub_dev, "standalone hub\n");
578
579 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
580 case 0x00:
581 dev_dbg(hub_dev, "ganged power switching\n");
582 break;
583 case 0x01:
584 dev_dbg(hub_dev, "individual port power switching\n");
585 break;
586 case 0x02:
587 case 0x03:
588 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
589 break;
590 }
591
592 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
593 case 0x00:
594 dev_dbg(hub_dev, "global over-current protection\n");
595 break;
596 case 0x08:
597 dev_dbg(hub_dev, "individual port over-current protection\n");
598 break;
599 case 0x10:
600 case 0x18:
601 dev_dbg(hub_dev, "no over-current protection\n");
602 break;
603 }
604
605 spin_lock_init (&hub->tt.lock);
606 INIT_LIST_HEAD (&hub->tt.clear_list);
607 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
608 switch (hdev->descriptor.bDeviceProtocol) {
609 case 0:
610 break;
611 case 1:
612 dev_dbg(hub_dev, "Single TT\n");
613 hub->tt.hub = hdev;
614 break;
615 case 2:
616 ret = usb_set_interface(hdev, 0, 1);
617 if (ret == 0) {
618 dev_dbg(hub_dev, "TT per port\n");
619 hub->tt.multi = 1;
620 } else
621 dev_err(hub_dev, "Using single TT (err %d)\n",
622 ret);
623 hub->tt.hub = hdev;
624 break;
625 default:
626 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
627 hdev->descriptor.bDeviceProtocol);
628 break;
629 }
630
631 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
632 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
633 case HUB_TTTT_8_BITS:
634 if (hdev->descriptor.bDeviceProtocol != 0) {
635 hub->tt.think_time = 666;
636 dev_dbg(hub_dev, "TT requires at most %d "
637 "FS bit times (%d ns)\n",
638 8, hub->tt.think_time);
639 }
640 break;
641 case HUB_TTTT_16_BITS:
642 hub->tt.think_time = 666 * 2;
643 dev_dbg(hub_dev, "TT requires at most %d "
644 "FS bit times (%d ns)\n",
645 16, hub->tt.think_time);
646 break;
647 case HUB_TTTT_24_BITS:
648 hub->tt.think_time = 666 * 3;
649 dev_dbg(hub_dev, "TT requires at most %d "
650 "FS bit times (%d ns)\n",
651 24, hub->tt.think_time);
652 break;
653 case HUB_TTTT_32_BITS:
654 hub->tt.think_time = 666 * 4;
655 dev_dbg(hub_dev, "TT requires at most %d "
656 "FS bit times (%d ns)\n",
657 32, hub->tt.think_time);
658 break;
659 }
660
661 /* probe() zeroes hub->indicator[] */
662 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) {
663 hub->has_indicators = 1;
664 dev_dbg(hub_dev, "Port indicators are supported\n");
665 }
666
667 dev_dbg(hub_dev, "power on to power good time: %dms\n",
668 hub->descriptor->bPwrOn2PwrGood * 2);
669
670 /* power budgeting mostly matters with bus-powered hubs,
671 * and battery-powered root hubs (may provide just 8 mA).
672 */
673 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
674 if (ret < 0) {
675 message = "can't get hub status";
676 goto fail;
677 }
678 le16_to_cpus(&hubstatus);
679 if (hdev == hdev->bus->root_hub) {
680 struct usb_hcd *hcd =
681 container_of(hdev->bus, struct usb_hcd, self);
682
683 hub->power_budget = min(500u, hcd->power_budget) / 2;
684 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
685 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
686 hub->descriptor->bHubContrCurrent);
687 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
688 / 2;
689 }
690 if (hub->power_budget)
691 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
692 hub->power_budget * 2);
693
694
695 ret = hub_hub_status(hub, &hubstatus, &hubchange);
696 if (ret < 0) {
697 message = "can't get hub status";
698 goto fail;
699 }
700
701 /* local power status reports aren't always correct */
702 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
703 dev_dbg(hub_dev, "local power source is %s\n",
704 (hubstatus & HUB_STATUS_LOCAL_POWER)
705 ? "lost (inactive)" : "good");
706
707 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
708 dev_dbg(hub_dev, "%sover-current condition exists\n",
709 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
710
711 /* set up the interrupt endpoint */
712 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
713 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
714
715 if (maxp > sizeof(*hub->buffer))
716 maxp = sizeof(*hub->buffer);
717
718 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
719 if (!hub->urb) {
720 message = "couldn't allocate interrupt urb";
721 ret = -ENOMEM;
722 goto fail;
723 }
724
725 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
726 hub, endpoint->bInterval);
727 hub->urb->transfer_dma = hub->buffer_dma;
728 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
729
730 /* maybe cycle the hub leds */
731 if (hub->has_indicators && blinkenlights)
732 hub->indicator [0] = INDICATOR_CYCLE;
733
734 hub_power_on(hub);
735 hub_activate(hub);
736 return 0;
737
738 fail:
739 dev_err (hub_dev, "config failed, %s (err %d)\n",
740 message, ret);
741 /* hub_disconnect() frees urb and descriptor */
742 return ret;
743 }
744
745 static unsigned highspeed_hubs;
746
747 /* Called after the hub driver is unbound from a hub with children */
748 static void hub_remove_children_work(void *__hub)
749 {
750 struct usb_hub *hub = __hub;
751 struct usb_device *hdev = hub->hdev;
752 int i;
753
754 kfree(hub);
755
756 usb_lock_device(hdev);
757 for (i = 0; i < hdev->maxchild; ++i) {
758 if (hdev->children[i])
759 usb_disconnect(&hdev->children[i]);
760 }
761 usb_unlock_device(hdev);
762 usb_put_dev(hdev);
763 }
764
765 static void hub_disconnect(struct usb_interface *intf)
766 {
767 struct usb_hub *hub = usb_get_intfdata (intf);
768 struct usb_device *hdev;
769 int n, port1;
770
771 usb_set_intfdata (intf, NULL);
772 hdev = hub->hdev;
773
774 if (hdev->speed == USB_SPEED_HIGH)
775 highspeed_hubs--;
776
777 hub_quiesce(hub);
778 usb_free_urb(hub->urb);
779 hub->urb = NULL;
780
781 spin_lock_irq(&hub_event_lock);
782 list_del_init(&hub->event_list);
783 spin_unlock_irq(&hub_event_lock);
784
785 kfree(hub->descriptor);
786 hub->descriptor = NULL;
787
788 kfree(hub->status);
789 hub->status = NULL;
790
791 if (hub->buffer) {
792 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
793 hub->buffer_dma);
794 hub->buffer = NULL;
795 }
796
797 /* If there are any children then this is an unbind only, not a
798 * physical disconnection. The active ports must be disabled
799 * and later on we must call usb_disconnect(). We can't call
800 * it now because we may not hold the hub's device lock.
801 */
802 n = 0;
803 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
804 if (hdev->children[port1 - 1]) {
805 ++n;
806 hub_port_disable(hub, port1, 1);
807 }
808 }
809
810 if (n == 0)
811 kfree(hub);
812 else {
813 /* Reuse the hub->leds work_struct for our own purposes */
814 INIT_WORK(&hub->leds, hub_remove_children_work, hub);
815 schedule_work(&hub->leds);
816 usb_get_dev(hdev);
817 }
818 }
819
820 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
821 {
822 struct usb_host_interface *desc;
823 struct usb_endpoint_descriptor *endpoint;
824 struct usb_device *hdev;
825 struct usb_hub *hub;
826
827 desc = intf->cur_altsetting;
828 hdev = interface_to_usbdev(intf);
829
830 /* Some hubs have a subclass of 1, which AFAICT according to the */
831 /* specs is not defined, but it works */
832 if ((desc->desc.bInterfaceSubClass != 0) &&
833 (desc->desc.bInterfaceSubClass != 1)) {
834 descriptor_error:
835 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
836 return -EIO;
837 }
838
839 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
840 if (desc->desc.bNumEndpoints != 1)
841 goto descriptor_error;
842
843 endpoint = &desc->endpoint[0].desc;
844
845 /* Output endpoint? Curiouser and curiouser.. */
846 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
847 goto descriptor_error;
848
849 /* If it's not an interrupt endpoint, we'd better punt! */
850 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
851 != USB_ENDPOINT_XFER_INT)
852 goto descriptor_error;
853
854 /* We found a hub */
855 dev_info (&intf->dev, "USB hub found\n");
856
857 hub = kmalloc(sizeof(*hub), GFP_KERNEL);
858 if (!hub) {
859 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
860 return -ENOMEM;
861 }
862
863 memset(hub, 0, sizeof(*hub));
864
865 INIT_LIST_HEAD(&hub->event_list);
866 hub->intfdev = &intf->dev;
867 hub->hdev = hdev;
868 INIT_WORK(&hub->leds, led_work, hub);
869
870 usb_set_intfdata (intf, hub);
871
872 if (hdev->speed == USB_SPEED_HIGH)
873 highspeed_hubs++;
874
875 if (hub_configure(hub, endpoint) >= 0)
876 return 0;
877
878 hub_disconnect (intf);
879 return -ENODEV;
880 }
881
882 static int
883 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
884 {
885 struct usb_device *hdev = interface_to_usbdev (intf);
886
887 /* assert ifno == 0 (part of hub spec) */
888 switch (code) {
889 case USBDEVFS_HUB_PORTINFO: {
890 struct usbdevfs_hub_portinfo *info = user_data;
891 int i;
892
893 spin_lock_irq(&device_state_lock);
894 if (hdev->devnum <= 0)
895 info->nports = 0;
896 else {
897 info->nports = hdev->maxchild;
898 for (i = 0; i < info->nports; i++) {
899 if (hdev->children[i] == NULL)
900 info->port[i] = 0;
901 else
902 info->port[i] =
903 hdev->children[i]->devnum;
904 }
905 }
906 spin_unlock_irq(&device_state_lock);
907
908 return info->nports + 1;
909 }
910
911 default:
912 return -ENOSYS;
913 }
914 }
915
916 /* caller has locked the hub device */
917 static void hub_pre_reset(struct usb_hub *hub)
918 {
919 struct usb_device *hdev = hub->hdev;
920 int i;
921
922 for (i = 0; i < hdev->maxchild; ++i) {
923 if (hdev->children[i])
924 usb_disconnect(&hdev->children[i]);
925 }
926 hub_quiesce(hub);
927 }
928
929 /* caller has locked the hub device */
930 static void hub_post_reset(struct usb_hub *hub)
931 {
932 hub_activate(hub);
933 hub_power_on(hub);
934 }
935
936
937 /* grab device/port lock, returning index of that port (zero based).
938 * protects the upstream link used by this device from concurrent
939 * tree operations like suspend, resume, reset, and disconnect, which
940 * apply to everything downstream of a given port.
941 */
942 static int locktree(struct usb_device *udev)
943 {
944 int t;
945 struct usb_device *hdev;
946
947 if (!udev)
948 return -ENODEV;
949
950 /* root hub is always the first lock in the series */
951 hdev = udev->parent;
952 if (!hdev) {
953 usb_lock_device(udev);
954 return 0;
955 }
956
957 /* on the path from root to us, lock everything from
958 * top down, dropping parent locks when not needed
959 */
960 t = locktree(hdev);
961 if (t < 0)
962 return t;
963 for (t = 0; t < hdev->maxchild; t++) {
964 if (hdev->children[t] == udev) {
965 /* everything is fail-fast once disconnect
966 * processing starts
967 */
968 if (udev->state == USB_STATE_NOTATTACHED)
969 break;
970
971 /* when everyone grabs locks top->bottom,
972 * non-overlapping work may be concurrent
973 */
974 down(&udev->serialize);
975 up(&hdev->serialize);
976 return t + 1;
977 }
978 }
979 usb_unlock_device(hdev);
980 return -ENODEV;
981 }
982
983 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
984 {
985 int i;
986
987 for (i = 0; i < udev->maxchild; ++i) {
988 if (udev->children[i])
989 recursively_mark_NOTATTACHED(udev->children[i]);
990 }
991 udev->state = USB_STATE_NOTATTACHED;
992 }
993
994 /**
995 * usb_set_device_state - change a device's current state (usbcore, hcds)
996 * @udev: pointer to device whose state should be changed
997 * @new_state: new state value to be stored
998 *
999 * udev->state is _not_ fully protected by the device lock. Although
1000 * most transitions are made only while holding the lock, the state can
1001 * can change to USB_STATE_NOTATTACHED at almost any time. This
1002 * is so that devices can be marked as disconnected as soon as possible,
1003 * without having to wait for any semaphores to be released. As a result,
1004 * all changes to any device's state must be protected by the
1005 * device_state_lock spinlock.
1006 *
1007 * Once a device has been added to the device tree, all changes to its state
1008 * should be made using this routine. The state should _not_ be set directly.
1009 *
1010 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1011 * Otherwise udev->state is set to new_state, and if new_state is
1012 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1013 * to USB_STATE_NOTATTACHED.
1014 */
1015 void usb_set_device_state(struct usb_device *udev,
1016 enum usb_device_state new_state)
1017 {
1018 unsigned long flags;
1019
1020 spin_lock_irqsave(&device_state_lock, flags);
1021 if (udev->state == USB_STATE_NOTATTACHED)
1022 ; /* do nothing */
1023 else if (new_state != USB_STATE_NOTATTACHED)
1024 udev->state = new_state;
1025 else
1026 recursively_mark_NOTATTACHED(udev);
1027 spin_unlock_irqrestore(&device_state_lock, flags);
1028 }
1029 EXPORT_SYMBOL(usb_set_device_state);
1030
1031
1032 static void choose_address(struct usb_device *udev)
1033 {
1034 int devnum;
1035 struct usb_bus *bus = udev->bus;
1036
1037 /* If khubd ever becomes multithreaded, this will need a lock */
1038
1039 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1040 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1041 bus->devnum_next);
1042 if (devnum >= 128)
1043 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1044
1045 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1046
1047 if (devnum < 128) {
1048 set_bit(devnum, bus->devmap.devicemap);
1049 udev->devnum = devnum;
1050 }
1051 }
1052
1053 static void release_address(struct usb_device *udev)
1054 {
1055 if (udev->devnum > 0) {
1056 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1057 udev->devnum = -1;
1058 }
1059 }
1060
1061 /**
1062 * usb_disconnect - disconnect a device (usbcore-internal)
1063 * @pdev: pointer to device being disconnected
1064 * Context: !in_interrupt ()
1065 *
1066 * Something got disconnected. Get rid of it and all of its children.
1067 *
1068 * If *pdev is a normal device then the parent hub must already be locked.
1069 * If *pdev is a root hub then this routine will acquire the
1070 * usb_bus_list_lock on behalf of the caller.
1071 *
1072 * Only hub drivers (including virtual root hub drivers for host
1073 * controllers) should ever call this.
1074 *
1075 * This call is synchronous, and may not be used in an interrupt context.
1076 */
1077 void usb_disconnect(struct usb_device **pdev)
1078 {
1079 struct usb_device *udev = *pdev;
1080 int i;
1081
1082 if (!udev) {
1083 pr_debug ("%s nodev\n", __FUNCTION__);
1084 return;
1085 }
1086
1087 /* mark the device as inactive, so any further urb submissions for
1088 * this device (and any of its children) will fail immediately.
1089 * this quiesces everyting except pending urbs.
1090 */
1091 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1092
1093 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1094 if (!udev->parent) {
1095 down(&usb_bus_list_lock);
1096 usb_lock_device(udev);
1097 } else
1098 down(&udev->serialize);
1099
1100 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1101
1102 /* Free up all the children before we remove this device */
1103 for (i = 0; i < USB_MAXCHILDREN; i++) {
1104 if (udev->children[i])
1105 usb_disconnect(&udev->children[i]);
1106 }
1107
1108 /* deallocate hcd/hardware state ... nuking all pending urbs and
1109 * cleaning up all state associated with the current configuration
1110 * so that the hardware is now fully quiesced.
1111 */
1112 usb_disable_device(udev, 0);
1113
1114 /* Free the device number, remove the /proc/bus/usb entry and
1115 * the sysfs attributes, and delete the parent's children[]
1116 * (or root_hub) pointer.
1117 */
1118 dev_dbg (&udev->dev, "unregistering device\n");
1119 release_address(udev);
1120 usbfs_remove_device(udev);
1121 usbdev_remove(udev);
1122 usb_remove_sysfs_dev_files(udev);
1123
1124 /* Avoid races with recursively_mark_NOTATTACHED() */
1125 spin_lock_irq(&device_state_lock);
1126 *pdev = NULL;
1127 spin_unlock_irq(&device_state_lock);
1128
1129 if (!udev->parent) {
1130 usb_unlock_device(udev);
1131 up(&usb_bus_list_lock);
1132 } else
1133 up(&udev->serialize);
1134
1135 device_unregister(&udev->dev);
1136 }
1137
1138 static int choose_configuration(struct usb_device *udev)
1139 {
1140 int c, i;
1141
1142 /* NOTE: this should interact with hub power budgeting */
1143
1144 c = udev->config[0].desc.bConfigurationValue;
1145 if (udev->descriptor.bNumConfigurations != 1) {
1146 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1147 struct usb_interface_descriptor *desc;
1148
1149 /* heuristic: Linux is more likely to have class
1150 * drivers, so avoid vendor-specific interfaces.
1151 */
1152 desc = &udev->config[i].intf_cache[0]
1153 ->altsetting->desc;
1154 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1155 continue;
1156 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1157 * MSFT needs this to be the first config; never use
1158 * it as the default unless Linux has host-side RNDIS.
1159 * A second config would ideally be CDC-Ethernet, but
1160 * may instead be the "vendor specific" CDC subset
1161 * long used by ARM Linux for sa1100 or pxa255.
1162 */
1163 if (desc->bInterfaceClass == USB_CLASS_COMM
1164 && desc->bInterfaceSubClass == 2
1165 && desc->bInterfaceProtocol == 0xff) {
1166 c = udev->config[1].desc.bConfigurationValue;
1167 continue;
1168 }
1169 c = udev->config[i].desc.bConfigurationValue;
1170 break;
1171 }
1172 dev_info(&udev->dev,
1173 "configuration #%d chosen from %d choices\n",
1174 c, udev->descriptor.bNumConfigurations);
1175 }
1176 return c;
1177 }
1178
1179 #ifdef DEBUG
1180 static void show_string(struct usb_device *udev, char *id, char *string)
1181 {
1182 if (!string)
1183 return;
1184 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1185 }
1186
1187 #else
1188 static inline void show_string(struct usb_device *udev, char *id, char *string)
1189 {}
1190 #endif
1191
1192 static void get_string(struct usb_device *udev, char **string, int index)
1193 {
1194 char *buf;
1195
1196 if (!index)
1197 return;
1198 buf = kmalloc(256, GFP_KERNEL);
1199 if (!buf)
1200 return;
1201 if (usb_string(udev, index, buf, 256) > 0)
1202 *string = buf;
1203 else
1204 kfree(buf);
1205 }
1206
1207
1208 #ifdef CONFIG_USB_OTG
1209 #include "otg_whitelist.h"
1210 #endif
1211
1212 /**
1213 * usb_new_device - perform initial device setup (usbcore-internal)
1214 * @udev: newly addressed device (in ADDRESS state)
1215 *
1216 * This is called with devices which have been enumerated, but not yet
1217 * configured. The device descriptor is available, but not descriptors
1218 * for any device configuration. The caller must have locked udev and
1219 * either the parent hub (if udev is a normal device) or else the
1220 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1221 * udev has already been installed, but udev is not yet visible through
1222 * sysfs or other filesystem code.
1223 *
1224 * Returns 0 for success (device is configured and listed, with its
1225 * interfaces, in sysfs); else a negative errno value.
1226 *
1227 * This call is synchronous, and may not be used in an interrupt context.
1228 *
1229 * Only the hub driver should ever call this; root hub registration
1230 * uses it indirectly.
1231 */
1232 int usb_new_device(struct usb_device *udev)
1233 {
1234 int err;
1235 int c;
1236
1237 err = usb_get_configuration(udev);
1238 if (err < 0) {
1239 dev_err(&udev->dev, "can't read configurations, error %d\n",
1240 err);
1241 goto fail;
1242 }
1243
1244 /* read the standard strings and cache them if present */
1245 get_string(udev, &udev->product, udev->descriptor.iProduct);
1246 get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);
1247 get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);
1248
1249 /* Tell the world! */
1250 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1251 "SerialNumber=%d\n",
1252 udev->descriptor.iManufacturer,
1253 udev->descriptor.iProduct,
1254 udev->descriptor.iSerialNumber);
1255 show_string(udev, "Product", udev->product);
1256 show_string(udev, "Manufacturer", udev->manufacturer);
1257 show_string(udev, "SerialNumber", udev->serial);
1258
1259 #ifdef CONFIG_USB_OTG
1260 /*
1261 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1262 * to wake us after we've powered off VBUS; and HNP, switching roles
1263 * "host" to "peripheral". The OTG descriptor helps figure this out.
1264 */
1265 if (!udev->bus->is_b_host
1266 && udev->config
1267 && udev->parent == udev->bus->root_hub) {
1268 struct usb_otg_descriptor *desc = 0;
1269 struct usb_bus *bus = udev->bus;
1270
1271 /* descriptor may appear anywhere in config */
1272 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1273 le16_to_cpu(udev->config[0].desc.wTotalLength),
1274 USB_DT_OTG, (void **) &desc) == 0) {
1275 if (desc->bmAttributes & USB_OTG_HNP) {
1276 unsigned port1;
1277 struct usb_device *root = udev->parent;
1278
1279 for (port1 = 1; port1 <= root->maxchild;
1280 port1++) {
1281 if (root->children[port1-1] == udev)
1282 break;
1283 }
1284
1285 dev_info(&udev->dev,
1286 "Dual-Role OTG device on %sHNP port\n",
1287 (port1 == bus->otg_port)
1288 ? "" : "non-");
1289
1290 /* enable HNP before suspend, it's simpler */
1291 if (port1 == bus->otg_port)
1292 bus->b_hnp_enable = 1;
1293 err = usb_control_msg(udev,
1294 usb_sndctrlpipe(udev, 0),
1295 USB_REQ_SET_FEATURE, 0,
1296 bus->b_hnp_enable
1297 ? USB_DEVICE_B_HNP_ENABLE
1298 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1299 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1300 if (err < 0) {
1301 /* OTG MESSAGE: report errors here,
1302 * customize to match your product.
1303 */
1304 dev_info(&udev->dev,
1305 "can't set HNP mode; %d\n",
1306 err);
1307 bus->b_hnp_enable = 0;
1308 }
1309 }
1310 }
1311 }
1312
1313 if (!is_targeted(udev)) {
1314
1315 /* Maybe it can talk to us, though we can't talk to it.
1316 * (Includes HNP test device.)
1317 */
1318 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1319 static int __usb_suspend_device (struct usb_device *,
1320 int port1, pm_message_t state);
1321 err = __usb_suspend_device(udev,
1322 udev->bus->otg_port,
1323 PMSG_SUSPEND);
1324 if (err < 0)
1325 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1326 }
1327 err = -ENODEV;
1328 goto fail;
1329 }
1330 #endif
1331
1332 /* put device-specific files into sysfs */
1333 err = device_add (&udev->dev);
1334 if (err) {
1335 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1336 goto fail;
1337 }
1338 usb_create_sysfs_dev_files (udev);
1339
1340 /* choose and set the configuration. that registers the interfaces
1341 * with the driver core, and lets usb device drivers bind to them.
1342 */
1343 c = choose_configuration(udev);
1344 if (c < 0)
1345 dev_warn(&udev->dev,
1346 "can't choose an initial configuration\n");
1347 else {
1348 err = usb_set_configuration(udev, c);
1349 if (err) {
1350 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1351 c, err);
1352 usb_remove_sysfs_dev_files(udev);
1353 device_del(&udev->dev);
1354 goto fail;
1355 }
1356 }
1357
1358 /* USB device state == configured ... usable */
1359
1360 /* add a /proc/bus/usb entry */
1361 usbdev_add(udev);
1362 usbfs_add_device(udev);
1363 return 0;
1364
1365 fail:
1366 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1367 return err;
1368 }
1369
1370
1371 static int hub_port_status(struct usb_hub *hub, int port1,
1372 u16 *status, u16 *change)
1373 {
1374 int ret;
1375
1376 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1377 if (ret < 0)
1378 dev_err (hub->intfdev,
1379 "%s failed (err = %d)\n", __FUNCTION__, ret);
1380 else {
1381 *status = le16_to_cpu(hub->status->port.wPortStatus);
1382 *change = le16_to_cpu(hub->status->port.wPortChange);
1383 ret = 0;
1384 }
1385 return ret;
1386 }
1387
1388 #define PORT_RESET_TRIES 5
1389 #define SET_ADDRESS_TRIES 2
1390 #define GET_DESCRIPTOR_TRIES 2
1391 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1392 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1393
1394 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1395 #define HUB_SHORT_RESET_TIME 10
1396 #define HUB_LONG_RESET_TIME 200
1397 #define HUB_RESET_TIMEOUT 500
1398
1399 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1400 struct usb_device *udev, unsigned int delay)
1401 {
1402 int delay_time, ret;
1403 u16 portstatus;
1404 u16 portchange;
1405
1406 for (delay_time = 0;
1407 delay_time < HUB_RESET_TIMEOUT;
1408 delay_time += delay) {
1409 /* wait to give the device a chance to reset */
1410 msleep(delay);
1411
1412 /* read and decode port status */
1413 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1414 if (ret < 0)
1415 return ret;
1416
1417 /* Device went away? */
1418 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1419 return -ENOTCONN;
1420
1421 /* bomb out completely if something weird happened */
1422 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1423 return -EINVAL;
1424
1425 /* if we`ve finished resetting, then break out of the loop */
1426 if (!(portstatus & USB_PORT_STAT_RESET) &&
1427 (portstatus & USB_PORT_STAT_ENABLE)) {
1428 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1429 udev->speed = USB_SPEED_HIGH;
1430 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1431 udev->speed = USB_SPEED_LOW;
1432 else
1433 udev->speed = USB_SPEED_FULL;
1434 return 0;
1435 }
1436
1437 /* switch to the long delay after two short delay failures */
1438 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1439 delay = HUB_LONG_RESET_TIME;
1440
1441 dev_dbg (hub->intfdev,
1442 "port %d not reset yet, waiting %dms\n",
1443 port1, delay);
1444 }
1445
1446 return -EBUSY;
1447 }
1448
1449 static int hub_port_reset(struct usb_hub *hub, int port1,
1450 struct usb_device *udev, unsigned int delay)
1451 {
1452 int i, status;
1453
1454 /* Reset the port */
1455 for (i = 0; i < PORT_RESET_TRIES; i++) {
1456 status = set_port_feature(hub->hdev,
1457 port1, USB_PORT_FEAT_RESET);
1458 if (status)
1459 dev_err(hub->intfdev,
1460 "cannot reset port %d (err = %d)\n",
1461 port1, status);
1462 else {
1463 status = hub_port_wait_reset(hub, port1, udev, delay);
1464 if (status && status != -ENOTCONN)
1465 dev_dbg(hub->intfdev,
1466 "port_wait_reset: err = %d\n",
1467 status);
1468 }
1469
1470 /* return on disconnect or reset */
1471 switch (status) {
1472 case 0:
1473 /* TRSTRCY = 10 ms; plus some extra */
1474 msleep(10 + 40);
1475 /* FALL THROUGH */
1476 case -ENOTCONN:
1477 case -ENODEV:
1478 clear_port_feature(hub->hdev,
1479 port1, USB_PORT_FEAT_C_RESET);
1480 /* FIXME need disconnect() for NOTATTACHED device */
1481 usb_set_device_state(udev, status
1482 ? USB_STATE_NOTATTACHED
1483 : USB_STATE_DEFAULT);
1484 return status;
1485 }
1486
1487 dev_dbg (hub->intfdev,
1488 "port %d not enabled, trying reset again...\n",
1489 port1);
1490 delay = HUB_LONG_RESET_TIME;
1491 }
1492
1493 dev_err (hub->intfdev,
1494 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1495 port1);
1496
1497 return status;
1498 }
1499
1500 /*
1501 * Disable a port and mark a logical connnect-change event, so that some
1502 * time later khubd will disconnect() any existing usb_device on the port
1503 * and will re-enumerate if there actually is a device attached.
1504 */
1505 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1506 {
1507 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1508 hub_port_disable(hub, port1, 1);
1509
1510 /* FIXME let caller ask to power down the port:
1511 * - some devices won't enumerate without a VBUS power cycle
1512 * - SRP saves power that way
1513 * - usb_suspend_device(dev, PMSG_SUSPEND)
1514 * That's easy if this hub can switch power per-port, and
1515 * khubd reactivates the port later (timer, SRP, etc).
1516 * Powerdown must be optional, because of reset/DFU.
1517 */
1518
1519 set_bit(port1, hub->change_bits);
1520 kick_khubd(hub);
1521 }
1522
1523
1524 #ifdef CONFIG_USB_SUSPEND
1525
1526 /*
1527 * Selective port suspend reduces power; most suspended devices draw
1528 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1529 * All devices below the suspended port are also suspended.
1530 *
1531 * Devices leave suspend state when the host wakes them up. Some devices
1532 * also support "remote wakeup", where the device can activate the USB
1533 * tree above them to deliver data, such as a keypress or packet. In
1534 * some cases, this wakes the USB host.
1535 */
1536 static int hub_port_suspend(struct usb_hub *hub, int port1,
1537 struct usb_device *udev)
1538 {
1539 int status;
1540
1541 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1542
1543 /* enable remote wakeup when appropriate; this lets the device
1544 * wake up the upstream hub (including maybe the root hub).
1545 *
1546 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1547 * we don't explicitly enable it here.
1548 */
1549 if (udev->actconfig
1550 // && FIXME (remote wakeup enabled on this bus)
1551 // ... currently assuming it's always appropriate
1552 && (udev->actconfig->desc.bmAttributes
1553 & USB_CONFIG_ATT_WAKEUP) != 0) {
1554 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1555 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1556 USB_DEVICE_REMOTE_WAKEUP, 0,
1557 NULL, 0,
1558 USB_CTRL_SET_TIMEOUT);
1559 if (status)
1560 dev_dbg(&udev->dev,
1561 "won't remote wakeup, status %d\n",
1562 status);
1563 }
1564
1565 /* see 7.1.7.6 */
1566 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1567 if (status) {
1568 dev_dbg(hub->intfdev,
1569 "can't suspend port %d, status %d\n",
1570 port1, status);
1571 /* paranoia: "should not happen" */
1572 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1573 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1574 USB_DEVICE_REMOTE_WAKEUP, 0,
1575 NULL, 0,
1576 USB_CTRL_SET_TIMEOUT);
1577 } else {
1578 /* device has up to 10 msec to fully suspend */
1579 dev_dbg(&udev->dev, "usb suspend\n");
1580 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1581 msleep(10);
1582 }
1583 return status;
1584 }
1585
1586 /*
1587 * Devices on USB hub ports have only one "suspend" state, corresponding
1588 * to ACPI D2, "may cause the device to lose some context".
1589 * State transitions include:
1590 *
1591 * - suspend, resume ... when the VBUS power link stays live
1592 * - suspend, disconnect ... VBUS lost
1593 *
1594 * Once VBUS drop breaks the circuit, the port it's using has to go through
1595 * normal re-enumeration procedures, starting with enabling VBUS power.
1596 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1597 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1598 * timer, no SRP, no requests through sysfs.
1599 */
1600 static int __usb_suspend_device (struct usb_device *udev, int port1,
1601 pm_message_t state)
1602 {
1603 int status;
1604
1605 /* caller owns the udev device lock */
1606 if (port1 < 0)
1607 return port1;
1608
1609 if (udev->state == USB_STATE_SUSPENDED
1610 || udev->state == USB_STATE_NOTATTACHED) {
1611 return 0;
1612 }
1613
1614 /* suspend interface drivers; if this is a hub, it
1615 * suspends the child devices
1616 */
1617 if (udev->actconfig) {
1618 int i;
1619
1620 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1621 struct usb_interface *intf;
1622 struct usb_driver *driver;
1623
1624 intf = udev->actconfig->interface[i];
1625 if (state.event <= intf->dev.power.power_state.event)
1626 continue;
1627 if (!intf->dev.driver)
1628 continue;
1629 driver = to_usb_driver(intf->dev.driver);
1630
1631 if (driver->suspend) {
1632 status = driver->suspend(intf, state);
1633 if (intf->dev.power.power_state.event != state.event
1634 || status)
1635 dev_err(&intf->dev,
1636 "suspend %d fail, code %d\n",
1637 state.event, status);
1638 }
1639
1640 /* only drivers with suspend() can ever resume();
1641 * and after power loss, even they won't.
1642 * bus_rescan_devices() can rebind drivers later.
1643 *
1644 * FIXME the PM core self-deadlocks when unbinding
1645 * drivers during suspend/resume ... everything grabs
1646 * dpm_sem (not a spinlock, ugh). we want to unbind,
1647 * since we know every driver's probe/disconnect works
1648 * even for drivers that can't suspend.
1649 */
1650 if (!driver->suspend || state.event > PM_EVENT_FREEZE) {
1651 #if 1
1652 dev_warn(&intf->dev, "resume is unsafe!\n");
1653 #else
1654 down_write(&usb_bus_type.rwsem);
1655 device_release_driver(&intf->dev);
1656 up_write(&usb_bus_type.rwsem);
1657 #endif
1658 }
1659 }
1660 }
1661
1662 /*
1663 * FIXME this needs port power off call paths too, to help force
1664 * USB into the "generic" PM model. At least for devices on
1665 * ports that aren't using ganged switching (usually root hubs).
1666 *
1667 * NOTE: SRP-capable links should adopt more aggressive poweroff
1668 * policies (when HNP doesn't apply) once we have mechanisms to
1669 * turn power back on! (Likely not before 2.7...)
1670 */
1671 if (state.event > PM_EVENT_FREEZE) {
1672 dev_warn(&udev->dev, "no poweroff yet, suspending instead\n");
1673 }
1674
1675 /* "global suspend" of the HC-to-USB interface (root hub), or
1676 * "selective suspend" of just one hub-device link.
1677 */
1678 if (!udev->parent) {
1679 struct usb_bus *bus = udev->bus;
1680 if (bus && bus->op->hub_suspend) {
1681 status = bus->op->hub_suspend (bus);
1682 if (status == 0) {
1683 dev_dbg(&udev->dev, "usb suspend\n");
1684 usb_set_device_state(udev,
1685 USB_STATE_SUSPENDED);
1686 }
1687 } else
1688 status = -EOPNOTSUPP;
1689 } else
1690 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1691 udev);
1692
1693 if (status == 0)
1694 udev->dev.power.power_state = state;
1695 return status;
1696 }
1697
1698 /**
1699 * usb_suspend_device - suspend a usb device
1700 * @udev: device that's no longer in active use
1701 * @state: PMSG_SUSPEND to suspend
1702 * Context: must be able to sleep; device not locked
1703 *
1704 * Suspends a USB device that isn't in active use, conserving power.
1705 * Devices may wake out of a suspend, if anything important happens,
1706 * using the remote wakeup mechanism. They may also be taken out of
1707 * suspend by the host, using usb_resume_device(). It's also routine
1708 * to disconnect devices while they are suspended.
1709 *
1710 * Suspending OTG devices may trigger HNP, if that's been enabled
1711 * between a pair of dual-role devices. That will change roles, such
1712 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1713 *
1714 * Returns 0 on success, else negative errno.
1715 */
1716 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1717 {
1718 int port1, status;
1719
1720 port1 = locktree(udev);
1721 if (port1 < 0)
1722 return port1;
1723
1724 status = __usb_suspend_device(udev, port1, state);
1725 usb_unlock_device(udev);
1726 return status;
1727 }
1728
1729 /*
1730 * hardware resume signaling is finished, either because of selective
1731 * resume (by host) or remote wakeup (by device) ... now see what changed
1732 * in the tree that's rooted at this device.
1733 */
1734 static int finish_port_resume(struct usb_device *udev)
1735 {
1736 int status;
1737 u16 devstatus;
1738
1739 /* caller owns the udev device lock */
1740 dev_dbg(&udev->dev, "usb resume\n");
1741
1742 /* usb ch9 identifies four variants of SUSPENDED, based on what
1743 * state the device resumes to. Linux currently won't see the
1744 * first two on the host side; they'd be inside hub_port_init()
1745 * during many timeouts, but khubd can't suspend until later.
1746 */
1747 usb_set_device_state(udev, udev->actconfig
1748 ? USB_STATE_CONFIGURED
1749 : USB_STATE_ADDRESS);
1750 udev->dev.power.power_state = PMSG_ON;
1751
1752 /* 10.5.4.5 says be sure devices in the tree are still there.
1753 * For now let's assume the device didn't go crazy on resume,
1754 * and device drivers will know about any resume quirks.
1755 */
1756 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1757 if (status < 0)
1758 dev_dbg(&udev->dev,
1759 "gone after usb resume? status %d\n",
1760 status);
1761 else if (udev->actconfig) {
1762 unsigned i;
1763
1764 le16_to_cpus(&devstatus);
1765 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1766 status = usb_control_msg(udev,
1767 usb_sndctrlpipe(udev, 0),
1768 USB_REQ_CLEAR_FEATURE,
1769 USB_RECIP_DEVICE,
1770 USB_DEVICE_REMOTE_WAKEUP, 0,
1771 NULL, 0,
1772 USB_CTRL_SET_TIMEOUT);
1773 if (status) {
1774 dev_dbg(&udev->dev, "disable remote "
1775 "wakeup, status %d\n", status);
1776 status = 0;
1777 }
1778 }
1779
1780 /* resume interface drivers; if this is a hub, it
1781 * resumes the child devices
1782 */
1783 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1784 struct usb_interface *intf;
1785 struct usb_driver *driver;
1786
1787 intf = udev->actconfig->interface[i];
1788 if (intf->dev.power.power_state.event == PM_EVENT_ON)
1789 continue;
1790 if (!intf->dev.driver) {
1791 /* FIXME maybe force to alt 0 */
1792 continue;
1793 }
1794 driver = to_usb_driver(intf->dev.driver);
1795
1796 /* bus_rescan_devices() may rebind drivers */
1797 if (!driver->resume)
1798 continue;
1799
1800 /* can we do better than just logging errors? */
1801 status = driver->resume(intf);
1802 if (intf->dev.power.power_state.event != PM_EVENT_ON
1803 || status)
1804 dev_dbg(&intf->dev,
1805 "resume fail, state %d code %d\n",
1806 intf->dev.power.power_state.event, status);
1807 }
1808 status = 0;
1809
1810 } else if (udev->devnum <= 0) {
1811 dev_dbg(&udev->dev, "bogus resume!\n");
1812 status = -EINVAL;
1813 }
1814 return status;
1815 }
1816
1817 static int
1818 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1819 {
1820 int status;
1821
1822 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1823
1824 /* see 7.1.7.7; affects power usage, but not budgeting */
1825 status = clear_port_feature(hub->hdev,
1826 port1, USB_PORT_FEAT_SUSPEND);
1827 if (status) {
1828 dev_dbg(hub->intfdev,
1829 "can't resume port %d, status %d\n",
1830 port1, status);
1831 } else {
1832 u16 devstatus;
1833 u16 portchange;
1834
1835 /* drive resume for at least 20 msec */
1836 if (udev)
1837 dev_dbg(&udev->dev, "RESUME\n");
1838 msleep(25);
1839
1840 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1841 | USB_PORT_STAT_ENABLE \
1842 | USB_PORT_STAT_CONNECTION)
1843
1844 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1845 * stop resume signaling. Then finish the resume
1846 * sequence.
1847 */
1848 devstatus = portchange = 0;
1849 status = hub_port_status(hub, port1,
1850 &devstatus, &portchange);
1851 if (status < 0
1852 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1853 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1854 ) {
1855 dev_dbg(hub->intfdev,
1856 "port %d status %04x.%04x after resume, %d\n",
1857 port1, portchange, devstatus, status);
1858 } else {
1859 /* TRSMRCY = 10 msec */
1860 msleep(10);
1861 if (udev)
1862 status = finish_port_resume(udev);
1863 }
1864 }
1865 if (status < 0)
1866 hub_port_logical_disconnect(hub, port1);
1867
1868 return status;
1869 }
1870
1871 static int hub_resume (struct usb_interface *intf);
1872
1873 /**
1874 * usb_resume_device - re-activate a suspended usb device
1875 * @udev: device to re-activate
1876 * Context: must be able to sleep; device not locked
1877 *
1878 * This will re-activate the suspended device, increasing power usage
1879 * while letting drivers communicate again with its endpoints.
1880 * USB resume explicitly guarantees that the power session between
1881 * the host and the device is the same as it was when the device
1882 * suspended.
1883 *
1884 * Returns 0 on success, else negative errno.
1885 */
1886 int usb_resume_device(struct usb_device *udev)
1887 {
1888 int port1, status;
1889
1890 port1 = locktree(udev);
1891 if (port1 < 0)
1892 return port1;
1893
1894 /* "global resume" of the HC-to-USB interface (root hub), or
1895 * selective resume of one hub-to-device port
1896 */
1897 if (!udev->parent) {
1898 struct usb_bus *bus = udev->bus;
1899 if (bus && bus->op->hub_resume) {
1900 status = bus->op->hub_resume (bus);
1901 } else
1902 status = -EOPNOTSUPP;
1903 if (status == 0) {
1904 dev_dbg(&udev->dev, "usb resume\n");
1905 /* TRSMRCY = 10 msec */
1906 msleep(10);
1907 usb_set_device_state (udev, USB_STATE_CONFIGURED);
1908 udev->dev.power.power_state = PMSG_ON;
1909 status = hub_resume (udev
1910 ->actconfig->interface[0]);
1911 }
1912 } else if (udev->state == USB_STATE_SUSPENDED) {
1913 // NOTE this fails if parent is also suspended...
1914 status = hub_port_resume(hdev_to_hub(udev->parent),
1915 port1, udev);
1916 } else {
1917 status = 0;
1918 }
1919 if (status < 0) {
1920 dev_dbg(&udev->dev, "can't resume, status %d\n",
1921 status);
1922 }
1923
1924 usb_unlock_device(udev);
1925
1926 /* rebind drivers that had no suspend() */
1927 if (status == 0) {
1928 usb_lock_all_devices();
1929 bus_rescan_devices(&usb_bus_type);
1930 usb_unlock_all_devices();
1931 }
1932 return status;
1933 }
1934
1935 static int remote_wakeup(struct usb_device *udev)
1936 {
1937 int status = 0;
1938
1939 /* don't repeat RESUME sequence if this device
1940 * was already woken up by some other task
1941 */
1942 down(&udev->serialize);
1943 if (udev->state == USB_STATE_SUSPENDED) {
1944 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1945 /* TRSMRCY = 10 msec */
1946 msleep(10);
1947 status = finish_port_resume(udev);
1948 }
1949 up(&udev->serialize);
1950 return status;
1951 }
1952
1953 static int hub_suspend(struct usb_interface *intf, pm_message_t state)
1954 {
1955 struct usb_hub *hub = usb_get_intfdata (intf);
1956 struct usb_device *hdev = hub->hdev;
1957 unsigned port1;
1958 int status;
1959
1960 /* stop khubd and related activity */
1961 hub_quiesce(hub);
1962
1963 /* then suspend every port */
1964 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1965 struct usb_device *udev;
1966
1967 udev = hdev->children [port1-1];
1968 if (!udev)
1969 continue;
1970 down(&udev->serialize);
1971 status = __usb_suspend_device(udev, port1, state);
1972 up(&udev->serialize);
1973 if (status < 0)
1974 dev_dbg(&intf->dev, "suspend port %d --> %d\n",
1975 port1, status);
1976 }
1977
1978 intf->dev.power.power_state = state;
1979 return 0;
1980 }
1981
1982 static int hub_resume(struct usb_interface *intf)
1983 {
1984 struct usb_device *hdev = interface_to_usbdev(intf);
1985 struct usb_hub *hub = usb_get_intfdata (intf);
1986 unsigned port1;
1987 int status;
1988
1989 if (intf->dev.power.power_state.event == PM_EVENT_ON)
1990 return 0;
1991
1992 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1993 struct usb_device *udev;
1994 u16 portstat, portchange;
1995
1996 udev = hdev->children [port1-1];
1997 status = hub_port_status(hub, port1, &portstat, &portchange);
1998 if (status == 0) {
1999 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2000 clear_port_feature(hdev, port1,
2001 USB_PORT_FEAT_C_SUSPEND);
2002 portchange &= ~USB_PORT_STAT_C_SUSPEND;
2003 }
2004
2005 /* let khubd handle disconnects etc */
2006 if (portchange)
2007 continue;
2008 }
2009
2010 if (!udev || status < 0)
2011 continue;
2012 down (&udev->serialize);
2013 if (portstat & USB_PORT_STAT_SUSPEND)
2014 status = hub_port_resume(hub, port1, udev);
2015 else {
2016 status = finish_port_resume(udev);
2017 if (status < 0) {
2018 dev_dbg(&intf->dev, "resume port %d --> %d\n",
2019 port1, status);
2020 hub_port_logical_disconnect(hub, port1);
2021 }
2022 }
2023 up(&udev->serialize);
2024 }
2025 intf->dev.power.power_state = PMSG_ON;
2026
2027 hub->resume_root_hub = 0;
2028 hub_activate(hub);
2029 return 0;
2030 }
2031
2032 void usb_resume_root_hub(struct usb_device *hdev)
2033 {
2034 struct usb_hub *hub = hdev_to_hub(hdev);
2035
2036 hub->resume_root_hub = 1;
2037 kick_khubd(hub);
2038 }
2039
2040 #else /* !CONFIG_USB_SUSPEND */
2041
2042 int usb_suspend_device(struct usb_device *udev, pm_message_t state)
2043 {
2044 return 0;
2045 }
2046
2047 int usb_resume_device(struct usb_device *udev)
2048 {
2049 return 0;
2050 }
2051
2052 #define hub_suspend NULL
2053 #define hub_resume NULL
2054 #define remote_wakeup(x) 0
2055
2056 #endif /* CONFIG_USB_SUSPEND */
2057
2058 EXPORT_SYMBOL(usb_suspend_device);
2059 EXPORT_SYMBOL(usb_resume_device);
2060
2061
2062
2063 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2064 *
2065 * Between connect detection and reset signaling there must be a delay
2066 * of 100ms at least for debounce and power-settling. The corresponding
2067 * timer shall restart whenever the downstream port detects a disconnect.
2068 *
2069 * Apparently there are some bluetooth and irda-dongles and a number of
2070 * low-speed devices for which this debounce period may last over a second.
2071 * Not covered by the spec - but easy to deal with.
2072 *
2073 * This implementation uses a 1500ms total debounce timeout; if the
2074 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2075 * every 25ms for transient disconnects. When the port status has been
2076 * unchanged for 100ms it returns the port status.
2077 */
2078
2079 #define HUB_DEBOUNCE_TIMEOUT 1500
2080 #define HUB_DEBOUNCE_STEP 25
2081 #define HUB_DEBOUNCE_STABLE 100
2082
2083 static int hub_port_debounce(struct usb_hub *hub, int port1)
2084 {
2085 int ret;
2086 int total_time, stable_time = 0;
2087 u16 portchange, portstatus;
2088 unsigned connection = 0xffff;
2089
2090 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2091 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2092 if (ret < 0)
2093 return ret;
2094
2095 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2096 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2097 stable_time += HUB_DEBOUNCE_STEP;
2098 if (stable_time >= HUB_DEBOUNCE_STABLE)
2099 break;
2100 } else {
2101 stable_time = 0;
2102 connection = portstatus & USB_PORT_STAT_CONNECTION;
2103 }
2104
2105 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2106 clear_port_feature(hub->hdev, port1,
2107 USB_PORT_FEAT_C_CONNECTION);
2108 }
2109
2110 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2111 break;
2112 msleep(HUB_DEBOUNCE_STEP);
2113 }
2114
2115 dev_dbg (hub->intfdev,
2116 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2117 port1, total_time, stable_time, portstatus);
2118
2119 if (stable_time < HUB_DEBOUNCE_STABLE)
2120 return -ETIMEDOUT;
2121 return portstatus;
2122 }
2123
2124 static void ep0_reinit(struct usb_device *udev)
2125 {
2126 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2127 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2128 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2129 }
2130
2131 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2132 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2133
2134 static int hub_set_address(struct usb_device *udev)
2135 {
2136 int retval;
2137
2138 if (udev->devnum == 0)
2139 return -EINVAL;
2140 if (udev->state == USB_STATE_ADDRESS)
2141 return 0;
2142 if (udev->state != USB_STATE_DEFAULT)
2143 return -EINVAL;
2144 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2145 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2146 NULL, 0, USB_CTRL_SET_TIMEOUT);
2147 if (retval == 0) {
2148 usb_set_device_state(udev, USB_STATE_ADDRESS);
2149 ep0_reinit(udev);
2150 }
2151 return retval;
2152 }
2153
2154 /* Reset device, (re)assign address, get device descriptor.
2155 * Device connection must be stable, no more debouncing needed.
2156 * Returns device in USB_STATE_ADDRESS, except on error.
2157 *
2158 * If this is called for an already-existing device (as part of
2159 * usb_reset_device), the caller must own the device lock. For a
2160 * newly detected device that is not accessible through any global
2161 * pointers, it's not necessary to lock the device.
2162 */
2163 static int
2164 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2165 int retry_counter)
2166 {
2167 static DECLARE_MUTEX(usb_address0_sem);
2168
2169 struct usb_device *hdev = hub->hdev;
2170 int i, j, retval;
2171 unsigned delay = HUB_SHORT_RESET_TIME;
2172 enum usb_device_speed oldspeed = udev->speed;
2173
2174 /* root hub ports have a slightly longer reset period
2175 * (from USB 2.0 spec, section 7.1.7.5)
2176 */
2177 if (!hdev->parent) {
2178 delay = HUB_ROOT_RESET_TIME;
2179 if (port1 == hdev->bus->otg_port)
2180 hdev->bus->b_hnp_enable = 0;
2181 }
2182
2183 /* Some low speed devices have problems with the quick delay, so */
2184 /* be a bit pessimistic with those devices. RHbug #23670 */
2185 if (oldspeed == USB_SPEED_LOW)
2186 delay = HUB_LONG_RESET_TIME;
2187
2188 down(&usb_address0_sem);
2189
2190 /* Reset the device; full speed may morph to high speed */
2191 retval = hub_port_reset(hub, port1, udev, delay);
2192 if (retval < 0) /* error or disconnect */
2193 goto fail;
2194 /* success, speed is known */
2195 retval = -ENODEV;
2196
2197 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2198 dev_dbg(&udev->dev, "device reset changed speed!\n");
2199 goto fail;
2200 }
2201 oldspeed = udev->speed;
2202
2203 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2204 * it's fixed size except for full speed devices.
2205 */
2206 switch (udev->speed) {
2207 case USB_SPEED_HIGH: /* fixed at 64 */
2208 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2209 break;
2210 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2211 /* to determine the ep0 maxpacket size, try to read
2212 * the device descriptor to get bMaxPacketSize0 and
2213 * then correct our initial guess.
2214 */
2215 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2216 break;
2217 case USB_SPEED_LOW: /* fixed at 8 */
2218 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2219 break;
2220 default:
2221 goto fail;
2222 }
2223
2224 dev_info (&udev->dev,
2225 "%s %s speed USB device using %s and address %d\n",
2226 (udev->config) ? "reset" : "new",
2227 ({ char *speed; switch (udev->speed) {
2228 case USB_SPEED_LOW: speed = "low"; break;
2229 case USB_SPEED_FULL: speed = "full"; break;
2230 case USB_SPEED_HIGH: speed = "high"; break;
2231 default: speed = "?"; break;
2232 }; speed;}),
2233 udev->bus->controller->driver->name,
2234 udev->devnum);
2235
2236 /* Set up TT records, if needed */
2237 if (hdev->tt) {
2238 udev->tt = hdev->tt;
2239 udev->ttport = hdev->ttport;
2240 } else if (udev->speed != USB_SPEED_HIGH
2241 && hdev->speed == USB_SPEED_HIGH) {
2242 udev->tt = &hub->tt;
2243 udev->ttport = port1;
2244 }
2245
2246 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2247 * Because device hardware and firmware is sometimes buggy in
2248 * this area, and this is how Linux has done it for ages.
2249 * Change it cautiously.
2250 *
2251 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2252 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2253 * so it may help with some non-standards-compliant devices.
2254 * Otherwise we start with SET_ADDRESS and then try to read the
2255 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2256 * value.
2257 */
2258 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2259 if (USE_NEW_SCHEME(retry_counter)) {
2260 struct usb_device_descriptor *buf;
2261 int r = 0;
2262
2263 #define GET_DESCRIPTOR_BUFSIZE 64
2264 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2265 if (!buf) {
2266 retval = -ENOMEM;
2267 continue;
2268 }
2269
2270 /* Use a short timeout the first time through,
2271 * so that recalcitrant full-speed devices with
2272 * 8- or 16-byte ep0-maxpackets won't slow things
2273 * down tremendously by NAKing the unexpectedly
2274 * early status stage. Also, retry on all errors;
2275 * some devices are flakey.
2276 */
2277 for (j = 0; j < 3; ++j) {
2278 buf->bMaxPacketSize0 = 0;
2279 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2280 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2281 USB_DT_DEVICE << 8, 0,
2282 buf, GET_DESCRIPTOR_BUFSIZE,
2283 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2284 switch (buf->bMaxPacketSize0) {
2285 case 8: case 16: case 32: case 64:
2286 if (buf->bDescriptorType ==
2287 USB_DT_DEVICE) {
2288 r = 0;
2289 break;
2290 }
2291 /* FALL THROUGH */
2292 default:
2293 if (r == 0)
2294 r = -EPROTO;
2295 break;
2296 }
2297 if (r == 0)
2298 break;
2299 }
2300 udev->descriptor.bMaxPacketSize0 =
2301 buf->bMaxPacketSize0;
2302 kfree(buf);
2303
2304 retval = hub_port_reset(hub, port1, udev, delay);
2305 if (retval < 0) /* error or disconnect */
2306 goto fail;
2307 if (oldspeed != udev->speed) {
2308 dev_dbg(&udev->dev,
2309 "device reset changed speed!\n");
2310 retval = -ENODEV;
2311 goto fail;
2312 }
2313 if (r) {
2314 dev_err(&udev->dev, "device descriptor "
2315 "read/%s, error %d\n",
2316 "64", r);
2317 retval = -EMSGSIZE;
2318 continue;
2319 }
2320 #undef GET_DESCRIPTOR_BUFSIZE
2321 }
2322
2323 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2324 retval = hub_set_address(udev);
2325 if (retval >= 0)
2326 break;
2327 msleep(200);
2328 }
2329 if (retval < 0) {
2330 dev_err(&udev->dev,
2331 "device not accepting address %d, error %d\n",
2332 udev->devnum, retval);
2333 goto fail;
2334 }
2335
2336 /* cope with hardware quirkiness:
2337 * - let SET_ADDRESS settle, some device hardware wants it
2338 * - read ep0 maxpacket even for high and low speed,
2339 */
2340 msleep(10);
2341 if (USE_NEW_SCHEME(retry_counter))
2342 break;
2343
2344 retval = usb_get_device_descriptor(udev, 8);
2345 if (retval < 8) {
2346 dev_err(&udev->dev, "device descriptor "
2347 "read/%s, error %d\n",
2348 "8", retval);
2349 if (retval >= 0)
2350 retval = -EMSGSIZE;
2351 } else {
2352 retval = 0;
2353 break;
2354 }
2355 }
2356 if (retval)
2357 goto fail;
2358
2359 i = udev->descriptor.bMaxPacketSize0;
2360 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2361 if (udev->speed != USB_SPEED_FULL ||
2362 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2363 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2364 retval = -EMSGSIZE;
2365 goto fail;
2366 }
2367 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2368 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2369 ep0_reinit(udev);
2370 }
2371
2372 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2373 if (retval < (signed)sizeof(udev->descriptor)) {
2374 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2375 "all", retval);
2376 if (retval >= 0)
2377 retval = -ENOMSG;
2378 goto fail;
2379 }
2380
2381 retval = 0;
2382
2383 fail:
2384 if (retval)
2385 hub_port_disable(hub, port1, 0);
2386 up(&usb_address0_sem);
2387 return retval;
2388 }
2389
2390 static void
2391 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2392 {
2393 struct usb_qualifier_descriptor *qual;
2394 int status;
2395
2396 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2397 if (qual == NULL)
2398 return;
2399
2400 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2401 qual, sizeof *qual);
2402 if (status == sizeof *qual) {
2403 dev_info(&udev->dev, "not running at top speed; "
2404 "connect to a high speed hub\n");
2405 /* hub LEDs are probably harder to miss than syslog */
2406 if (hub->has_indicators) {
2407 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2408 schedule_work (&hub->leds);
2409 }
2410 }
2411 kfree(qual);
2412 }
2413
2414 static unsigned
2415 hub_power_remaining (struct usb_hub *hub)
2416 {
2417 struct usb_device *hdev = hub->hdev;
2418 int remaining;
2419 unsigned i;
2420
2421 remaining = hub->power_budget;
2422 if (!remaining) /* self-powered */
2423 return 0;
2424
2425 for (i = 0; i < hdev->maxchild; i++) {
2426 struct usb_device *udev = hdev->children[i];
2427 int delta, ceiling;
2428
2429 if (!udev)
2430 continue;
2431
2432 /* 100mA per-port ceiling, or 8mA for OTG ports */
2433 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2434 ceiling = 50;
2435 else
2436 ceiling = 4;
2437
2438 if (udev->actconfig)
2439 delta = udev->actconfig->desc.bMaxPower;
2440 else
2441 delta = ceiling;
2442 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2443 if (delta > ceiling)
2444 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2445 2 * (delta - ceiling), 2 * ceiling);
2446 remaining -= delta;
2447 }
2448 if (remaining < 0) {
2449 dev_warn(hub->intfdev,
2450 "%dmA over power budget!\n",
2451 -2 * remaining);
2452 remaining = 0;
2453 }
2454 return remaining;
2455 }
2456
2457 /* Handle physical or logical connection change events.
2458 * This routine is called when:
2459 * a port connection-change occurs;
2460 * a port enable-change occurs (often caused by EMI);
2461 * usb_reset_device() encounters changed descriptors (as from
2462 * a firmware download)
2463 * caller already locked the hub
2464 */
2465 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2466 u16 portstatus, u16 portchange)
2467 {
2468 struct usb_device *hdev = hub->hdev;
2469 struct device *hub_dev = hub->intfdev;
2470 int status, i;
2471
2472 dev_dbg (hub_dev,
2473 "port %d, status %04x, change %04x, %s\n",
2474 port1, portstatus, portchange, portspeed (portstatus));
2475
2476 if (hub->has_indicators) {
2477 set_port_led(hub, port1, HUB_LED_AUTO);
2478 hub->indicator[port1-1] = INDICATOR_AUTO;
2479 }
2480
2481 /* Disconnect any existing devices under this port */
2482 if (hdev->children[port1-1])
2483 usb_disconnect(&hdev->children[port1-1]);
2484 clear_bit(port1, hub->change_bits);
2485
2486 #ifdef CONFIG_USB_OTG
2487 /* during HNP, don't repeat the debounce */
2488 if (hdev->bus->is_b_host)
2489 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2490 #endif
2491
2492 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2493 status = hub_port_debounce(hub, port1);
2494 if (status < 0) {
2495 dev_err (hub_dev,
2496 "connect-debounce failed, port %d disabled\n",
2497 port1);
2498 goto done;
2499 }
2500 portstatus = status;
2501 }
2502
2503 /* Return now if nothing is connected */
2504 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2505
2506 /* maybe switch power back on (e.g. root hub was reset) */
2507 if ((hub->descriptor->wHubCharacteristics
2508 & HUB_CHAR_LPSM) < 2
2509 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2510 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2511
2512 if (portstatus & USB_PORT_STAT_ENABLE)
2513 goto done;
2514 return;
2515 }
2516
2517 #ifdef CONFIG_USB_SUSPEND
2518 /* If something is connected, but the port is suspended, wake it up. */
2519 if (portstatus & USB_PORT_STAT_SUSPEND) {
2520 status = hub_port_resume(hub, port1, NULL);
2521 if (status < 0) {
2522 dev_dbg(hub_dev,
2523 "can't clear suspend on port %d; %d\n",
2524 port1, status);
2525 goto done;
2526 }
2527 }
2528 #endif
2529
2530 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2531 struct usb_device *udev;
2532
2533 /* reallocate for each attempt, since references
2534 * to the previous one can escape in various ways
2535 */
2536 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2537 if (!udev) {
2538 dev_err (hub_dev,
2539 "couldn't allocate port %d usb_device\n",
2540 port1);
2541 goto done;
2542 }
2543
2544 usb_set_device_state(udev, USB_STATE_POWERED);
2545 udev->speed = USB_SPEED_UNKNOWN;
2546
2547 /* set the address */
2548 choose_address(udev);
2549 if (udev->devnum <= 0) {
2550 status = -ENOTCONN; /* Don't retry */
2551 goto loop;
2552 }
2553
2554 /* reset and get descriptor */
2555 status = hub_port_init(hub, udev, port1, i);
2556 if (status < 0)
2557 goto loop;
2558
2559 /* consecutive bus-powered hubs aren't reliable; they can
2560 * violate the voltage drop budget. if the new child has
2561 * a "powered" LED, users should notice we didn't enable it
2562 * (without reading syslog), even without per-port LEDs
2563 * on the parent.
2564 */
2565 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2566 && hub->power_budget) {
2567 u16 devstat;
2568
2569 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2570 &devstat);
2571 if (status < 0) {
2572 dev_dbg(&udev->dev, "get status %d ?\n", status);
2573 goto loop_disable;
2574 }
2575 cpu_to_le16s(&devstat);
2576 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2577 dev_err(&udev->dev,
2578 "can't connect bus-powered hub "
2579 "to this port\n");
2580 if (hub->has_indicators) {
2581 hub->indicator[port1-1] =
2582 INDICATOR_AMBER_BLINK;
2583 schedule_work (&hub->leds);
2584 }
2585 status = -ENOTCONN; /* Don't retry */
2586 goto loop_disable;
2587 }
2588 }
2589
2590 /* check for devices running slower than they could */
2591 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2592 && udev->speed == USB_SPEED_FULL
2593 && highspeed_hubs != 0)
2594 check_highspeed (hub, udev, port1);
2595
2596 /* Store the parent's children[] pointer. At this point
2597 * udev becomes globally accessible, although presumably
2598 * no one will look at it until hdev is unlocked.
2599 */
2600 down (&udev->serialize);
2601 status = 0;
2602
2603 /* We mustn't add new devices if the parent hub has
2604 * been disconnected; we would race with the
2605 * recursively_mark_NOTATTACHED() routine.
2606 */
2607 spin_lock_irq(&device_state_lock);
2608 if (hdev->state == USB_STATE_NOTATTACHED)
2609 status = -ENOTCONN;
2610 else
2611 hdev->children[port1-1] = udev;
2612 spin_unlock_irq(&device_state_lock);
2613
2614 /* Run it through the hoops (find a driver, etc) */
2615 if (!status) {
2616 status = usb_new_device(udev);
2617 if (status) {
2618 spin_lock_irq(&device_state_lock);
2619 hdev->children[port1-1] = NULL;
2620 spin_unlock_irq(&device_state_lock);
2621 }
2622 }
2623
2624 up (&udev->serialize);
2625 if (status)
2626 goto loop_disable;
2627
2628 status = hub_power_remaining(hub);
2629 if (status)
2630 dev_dbg(hub_dev,
2631 "%dmA power budget left\n",
2632 2 * status);
2633
2634 return;
2635
2636 loop_disable:
2637 hub_port_disable(hub, port1, 1);
2638 loop:
2639 ep0_reinit(udev);
2640 release_address(udev);
2641 usb_put_dev(udev);
2642 if (status == -ENOTCONN)
2643 break;
2644 }
2645
2646 done:
2647 hub_port_disable(hub, port1, 1);
2648 }
2649
2650 static void hub_events(void)
2651 {
2652 struct list_head *tmp;
2653 struct usb_device *hdev;
2654 struct usb_interface *intf;
2655 struct usb_hub *hub;
2656 struct device *hub_dev;
2657 u16 hubstatus;
2658 u16 hubchange;
2659 u16 portstatus;
2660 u16 portchange;
2661 int i, ret;
2662 int connect_change;
2663
2664 /*
2665 * We restart the list every time to avoid a deadlock with
2666 * deleting hubs downstream from this one. This should be
2667 * safe since we delete the hub from the event list.
2668 * Not the most efficient, but avoids deadlocks.
2669 */
2670 while (1) {
2671
2672 /* Grab the first entry at the beginning of the list */
2673 spin_lock_irq(&hub_event_lock);
2674 if (list_empty(&hub_event_list)) {
2675 spin_unlock_irq(&hub_event_lock);
2676 break;
2677 }
2678
2679 tmp = hub_event_list.next;
2680 list_del_init(tmp);
2681
2682 hub = list_entry(tmp, struct usb_hub, event_list);
2683 hdev = hub->hdev;
2684 intf = to_usb_interface(hub->intfdev);
2685 hub_dev = &intf->dev;
2686
2687 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2688 hdev->state, hub->descriptor
2689 ? hub->descriptor->bNbrPorts
2690 : 0,
2691 /* NOTE: expects max 15 ports... */
2692 (u16) hub->change_bits[0],
2693 (u16) hub->event_bits[0]);
2694
2695 usb_get_intf(intf);
2696 i = hub->resume_root_hub;
2697 spin_unlock_irq(&hub_event_lock);
2698
2699 /* Is this is a root hub wanting to be resumed? */
2700 if (i)
2701 usb_resume_device(hdev);
2702
2703 /* Lock the device, then check to see if we were
2704 * disconnected while waiting for the lock to succeed. */
2705 if (locktree(hdev) < 0) {
2706 usb_put_intf(intf);
2707 continue;
2708 }
2709 if (hub != usb_get_intfdata(intf))
2710 goto loop;
2711
2712 /* If the hub has died, clean up after it */
2713 if (hdev->state == USB_STATE_NOTATTACHED) {
2714 hub_pre_reset(hub);
2715 goto loop;
2716 }
2717
2718 /* If this is an inactive or suspended hub, do nothing */
2719 if (hub->quiescing)
2720 goto loop;
2721
2722 if (hub->error) {
2723 dev_dbg (hub_dev, "resetting for error %d\n",
2724 hub->error);
2725
2726 ret = usb_reset_device(hdev);
2727 if (ret) {
2728 dev_dbg (hub_dev,
2729 "error resetting hub: %d\n", ret);
2730 goto loop;
2731 }
2732
2733 hub->nerrors = 0;
2734 hub->error = 0;
2735 }
2736
2737 /* deal with port status changes */
2738 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2739 if (test_bit(i, hub->busy_bits))
2740 continue;
2741 connect_change = test_bit(i, hub->change_bits);
2742 if (!test_and_clear_bit(i, hub->event_bits) &&
2743 !connect_change && !hub->activating)
2744 continue;
2745
2746 ret = hub_port_status(hub, i,
2747 &portstatus, &portchange);
2748 if (ret < 0)
2749 continue;
2750
2751 if (hub->activating && !hdev->children[i-1] &&
2752 (portstatus &
2753 USB_PORT_STAT_CONNECTION))
2754 connect_change = 1;
2755
2756 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2757 clear_port_feature(hdev, i,
2758 USB_PORT_FEAT_C_CONNECTION);
2759 connect_change = 1;
2760 }
2761
2762 if (portchange & USB_PORT_STAT_C_ENABLE) {
2763 if (!connect_change)
2764 dev_dbg (hub_dev,
2765 "port %d enable change, "
2766 "status %08x\n",
2767 i, portstatus);
2768 clear_port_feature(hdev, i,
2769 USB_PORT_FEAT_C_ENABLE);
2770
2771 /*
2772 * EM interference sometimes causes badly
2773 * shielded USB devices to be shutdown by
2774 * the hub, this hack enables them again.
2775 * Works at least with mouse driver.
2776 */
2777 if (!(portstatus & USB_PORT_STAT_ENABLE)
2778 && !connect_change
2779 && hdev->children[i-1]) {
2780 dev_err (hub_dev,
2781 "port %i "
2782 "disabled by hub (EMI?), "
2783 "re-enabling...\n",
2784 i);
2785 connect_change = 1;
2786 }
2787 }
2788
2789 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2790 clear_port_feature(hdev, i,
2791 USB_PORT_FEAT_C_SUSPEND);
2792 if (hdev->children[i-1]) {
2793 ret = remote_wakeup(hdev->
2794 children[i-1]);
2795 if (ret < 0)
2796 connect_change = 1;
2797 } else {
2798 ret = -ENODEV;
2799 hub_port_disable(hub, i, 1);
2800 }
2801 dev_dbg (hub_dev,
2802 "resume on port %d, status %d\n",
2803 i, ret);
2804 }
2805
2806 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2807 dev_err (hub_dev,
2808 "over-current change on port %d\n",
2809 i);
2810 clear_port_feature(hdev, i,
2811 USB_PORT_FEAT_C_OVER_CURRENT);
2812 hub_power_on(hub);
2813 }
2814
2815 if (portchange & USB_PORT_STAT_C_RESET) {
2816 dev_dbg (hub_dev,
2817 "reset change on port %d\n",
2818 i);
2819 clear_port_feature(hdev, i,
2820 USB_PORT_FEAT_C_RESET);
2821 }
2822
2823 if (connect_change)
2824 hub_port_connect_change(hub, i,
2825 portstatus, portchange);
2826 } /* end for i */
2827
2828 /* deal with hub status changes */
2829 if (test_and_clear_bit(0, hub->event_bits) == 0)
2830 ; /* do nothing */
2831 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2832 dev_err (hub_dev, "get_hub_status failed\n");
2833 else {
2834 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2835 dev_dbg (hub_dev, "power change\n");
2836 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2837 }
2838 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2839 dev_dbg (hub_dev, "overcurrent change\n");
2840 msleep(500); /* Cool down */
2841 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2842 hub_power_on(hub);
2843 }
2844 }
2845
2846 hub->activating = 0;
2847
2848 /* If this is a root hub, tell the HCD it's okay to
2849 * re-enable port-change interrupts now. */
2850 if (!hdev->parent)
2851 usb_enable_root_hub_irq(hdev->bus);
2852
2853 loop:
2854 usb_unlock_device(hdev);
2855 usb_put_intf(intf);
2856
2857 } /* end while (1) */
2858 }
2859
2860 static int hub_thread(void *__unused)
2861 {
2862 do {
2863 hub_events();
2864 wait_event_interruptible(khubd_wait,
2865 !list_empty(&hub_event_list) ||
2866 kthread_should_stop());
2867 try_to_freeze();
2868 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2869
2870 pr_debug("%s: khubd exiting\n", usbcore_name);
2871 return 0;
2872 }
2873
2874 static struct usb_device_id hub_id_table [] = {
2875 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2876 .bDeviceClass = USB_CLASS_HUB},
2877 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2878 .bInterfaceClass = USB_CLASS_HUB},
2879 { } /* Terminating entry */
2880 };
2881
2882 MODULE_DEVICE_TABLE (usb, hub_id_table);
2883
2884 static struct usb_driver hub_driver = {
2885 .owner = THIS_MODULE,
2886 .name = "hub",
2887 .probe = hub_probe,
2888 .disconnect = hub_disconnect,
2889 .suspend = hub_suspend,
2890 .resume = hub_resume,
2891 .ioctl = hub_ioctl,
2892 .id_table = hub_id_table,
2893 };
2894
2895 int usb_hub_init(void)
2896 {
2897 if (usb_register(&hub_driver) < 0) {
2898 printk(KERN_ERR "%s: can't register hub driver\n",
2899 usbcore_name);
2900 return -1;
2901 }
2902
2903 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2904 if (!IS_ERR(khubd_task))
2905 return 0;
2906
2907 /* Fall through if kernel_thread failed */
2908 usb_deregister(&hub_driver);
2909 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2910
2911 return -1;
2912 }
2913
2914 void usb_hub_cleanup(void)
2915 {
2916 kthread_stop(khubd_task);
2917
2918 /*
2919 * Hub resources are freed for us by usb_deregister. It calls
2920 * usb_driver_purge on every device which in turn calls that
2921 * devices disconnect function if it is using this driver.
2922 * The hub_disconnect function takes care of releasing the
2923 * individual hub resources. -greg
2924 */
2925 usb_deregister(&hub_driver);
2926 } /* usb_hub_cleanup() */
2927
2928 static int config_descriptors_changed(struct usb_device *udev)
2929 {
2930 unsigned index;
2931 unsigned len = 0;
2932 struct usb_config_descriptor *buf;
2933
2934 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2935 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2936 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2937 }
2938 buf = kmalloc (len, SLAB_KERNEL);
2939 if (buf == NULL) {
2940 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2941 /* assume the worst */
2942 return 1;
2943 }
2944 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2945 int length;
2946 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2947
2948 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2949 old_length);
2950 if (length < old_length) {
2951 dev_dbg(&udev->dev, "config index %d, error %d\n",
2952 index, length);
2953 break;
2954 }
2955 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2956 != 0) {
2957 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2958 index, buf->bConfigurationValue);
2959 break;
2960 }
2961 }
2962 kfree(buf);
2963 return index != udev->descriptor.bNumConfigurations;
2964 }
2965
2966 /**
2967 * usb_reset_device - perform a USB port reset to reinitialize a device
2968 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2969 *
2970 * WARNING - don't reset any device unless drivers for all of its
2971 * interfaces are expecting that reset! Maybe some driver->reset()
2972 * method should eventually help ensure sufficient cooperation.
2973 *
2974 * Do a port reset, reassign the device's address, and establish its
2975 * former operating configuration. If the reset fails, or the device's
2976 * descriptors change from their values before the reset, or the original
2977 * configuration and altsettings cannot be restored, a flag will be set
2978 * telling khubd to pretend the device has been disconnected and then
2979 * re-connected. All drivers will be unbound, and the device will be
2980 * re-enumerated and probed all over again.
2981 *
2982 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2983 * flagged for logical disconnection, or some other negative error code
2984 * if the reset wasn't even attempted.
2985 *
2986 * The caller must own the device lock. For example, it's safe to use
2987 * this from a driver probe() routine after downloading new firmware.
2988 * For calls that might not occur during probe(), drivers should lock
2989 * the device using usb_lock_device_for_reset().
2990 */
2991 int usb_reset_device(struct usb_device *udev)
2992 {
2993 struct usb_device *parent_hdev = udev->parent;
2994 struct usb_hub *parent_hub;
2995 struct usb_device_descriptor descriptor = udev->descriptor;
2996 struct usb_hub *hub = NULL;
2997 int i, ret = 0, port1 = -1;
2998
2999 if (udev->state == USB_STATE_NOTATTACHED ||
3000 udev->state == USB_STATE_SUSPENDED) {
3001 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3002 udev->state);
3003 return -EINVAL;
3004 }
3005
3006 if (!parent_hdev) {
3007 /* this requires hcd-specific logic; see OHCI hc_restart() */
3008 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
3009 return -EISDIR;
3010 }
3011
3012 for (i = 0; i < parent_hdev->maxchild; i++)
3013 if (parent_hdev->children[i] == udev) {
3014 port1 = i + 1;
3015 break;
3016 }
3017
3018 if (port1 < 0) {
3019 /* If this ever happens, it's very bad */
3020 dev_err(&udev->dev, "Can't locate device's port!\n");
3021 return -ENOENT;
3022 }
3023 parent_hub = hdev_to_hub(parent_hdev);
3024
3025 /* If we're resetting an active hub, take some special actions */
3026 if (udev->actconfig &&
3027 udev->actconfig->interface[0]->dev.driver ==
3028 &hub_driver.driver &&
3029 (hub = hdev_to_hub(udev)) != NULL) {
3030 hub_pre_reset(hub);
3031 }
3032
3033 set_bit(port1, parent_hub->busy_bits);
3034 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3035
3036 /* ep0 maxpacket size may change; let the HCD know about it.
3037 * Other endpoints will be handled by re-enumeration. */
3038 ep0_reinit(udev);
3039 ret = hub_port_init(parent_hub, udev, port1, i);
3040 if (ret >= 0)
3041 break;
3042 }
3043 clear_bit(port1, parent_hub->busy_bits);
3044 if (ret < 0)
3045 goto re_enumerate;
3046
3047 /* Device might have changed firmware (DFU or similar) */
3048 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3049 || config_descriptors_changed (udev)) {
3050 dev_info(&udev->dev, "device firmware changed\n");
3051 udev->descriptor = descriptor; /* for disconnect() calls */
3052 goto re_enumerate;
3053 }
3054
3055 if (!udev->actconfig)
3056 goto done;
3057
3058 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3059 USB_REQ_SET_CONFIGURATION, 0,
3060 udev->actconfig->desc.bConfigurationValue, 0,
3061 NULL, 0, USB_CTRL_SET_TIMEOUT);
3062 if (ret < 0) {
3063 dev_err(&udev->dev,
3064 "can't restore configuration #%d (error=%d)\n",
3065 udev->actconfig->desc.bConfigurationValue, ret);
3066 goto re_enumerate;
3067 }
3068 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3069
3070 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3071 struct usb_interface *intf = udev->actconfig->interface[i];
3072 struct usb_interface_descriptor *desc;
3073
3074 /* set_interface resets host side toggle even
3075 * for altsetting zero. the interface may have no driver.
3076 */
3077 desc = &intf->cur_altsetting->desc;
3078 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3079 desc->bAlternateSetting);
3080 if (ret < 0) {
3081 dev_err(&udev->dev, "failed to restore interface %d "
3082 "altsetting %d (error=%d)\n",
3083 desc->bInterfaceNumber,
3084 desc->bAlternateSetting,
3085 ret);
3086 goto re_enumerate;
3087 }
3088 }
3089
3090 done:
3091 if (hub)
3092 hub_post_reset(hub);
3093 return 0;
3094
3095 re_enumerate:
3096 hub_port_logical_disconnect(parent_hub, port1);
3097 return -ENODEV;
3098 }
Verdex Pro support