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[PATCH] USB: Disconnect children during hub unbind
[deliverable/linux.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 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>
1da177e4
LT		 12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/completion.h>
17#include <linux/sched.h>
18#include <linux/list.h>
19#include <linux/slab.h>
20#include <linux/smp_lock.h>
21#include <linux/ioctl.h>
22#include <linux/usb.h>
23#include <linux/usbdevice_fs.h>
9c8d6178 24#include <linux/kthread.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
34/* Protect struct usb_device->state and ->children members
9ad3d6cc 35 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37static DEFINE_SPINLOCK(device_state_lock);
38
39/* khubd's worklist and its lock */
40static DEFINE_SPINLOCK(hub_event_lock);
41static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
42
43/* Wakes up khubd */
44static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
9c8d6178 46static struct task_struct *khubd_task;
1da177e4
LT		 47
48/* cycle leds on hubs that aren't blinking for attention */
49static int blinkenlights = 0;
50module_param (blinkenlights, bool, S_IRUGO);
51MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53/*
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
60 *
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
66 */
67static int old_scheme_first = 0;
68module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(old_scheme_first,
70 "start with the old device initialization scheme");
71
72static int use_both_schemes = 1;
73module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74MODULE_PARM_DESC(use_both_schemes,
75 "try the other device initialization scheme if the "
76 "first one fails");
77
78
79#ifdef DEBUG
80static inline char *portspeed (int portstatus)
81{
82 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83 return "480 Mb/s";
84 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85 return "1.5 Mb/s";
86 else
87 return "12 Mb/s";
88}
89#endif
90
91/* Note that hdev or one of its children must be locked! */
92static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93{
94 return usb_get_intfdata(hdev->actconfig->interface[0]);
95}
96
97/* USB 2.0 spec Section 11.24.4.5 */
98static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99{
100 int i, ret;
101
102 for (i = 0; i < 3; i++) {
103 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105 USB_DT_HUB << 8, 0, data, size,
106 USB_CTRL_GET_TIMEOUT);
107 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108 return ret;
109 }
110 return -EINVAL;
111}
112
113/*
114 * USB 2.0 spec Section 11.24.2.1
115 */
116static int clear_hub_feature(struct usb_device *hdev, int feature)
117{
118 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120}
121
122/*
123 * USB 2.0 spec Section 11.24.2.2
124 */
125static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126{
127 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129 NULL, 0, 1000);
130}
131
132/*
133 * USB 2.0 spec Section 11.24.2.13
134 */
135static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136{
137 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139 NULL, 0, 1000);
140}
141
142/*
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
145 */
146static void set_port_led(
147 struct usb_hub *hub,
148 int port1,
149 int selector
150)
151{
152 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153 USB_PORT_FEAT_INDICATOR);
154 if (status < 0)
155 dev_dbg (hub->intfdev,
156 "port %d indicator %s status %d\n",
157 port1,
158 ({ char *s; switch (selector) {
159 case HUB_LED_AMBER: s = "amber"; break;
160 case HUB_LED_GREEN: s = "green"; break;
161 case HUB_LED_OFF: s = "off"; break;
162 case HUB_LED_AUTO: s = "auto"; break;
163 default: s = "??"; break;
164 }; s; }),
165 status);
166}
167
168#define LED_CYCLE_PERIOD ((2*HZ)/3)
169
170static void led_work (void *__hub)
171{
172 struct usb_hub *hub = __hub;
173 struct usb_device *hdev = hub->hdev;
174 unsigned i;
175 unsigned changed = 0;
176 int cursor = -1;
177
178 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179 return;
180
181 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182 unsigned selector, mode;
183
184 /* 30%-50% duty cycle */
185
186 switch (hub->indicator[i]) {
187 /* cycle marker */
188 case INDICATOR_CYCLE:
189 cursor = i;
190 selector = HUB_LED_AUTO;
191 mode = INDICATOR_AUTO;
192 break;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK:
195 selector = HUB_LED_GREEN;
196 mode = INDICATOR_GREEN_BLINK_OFF;
197 break;
198 case INDICATOR_GREEN_BLINK_OFF:
199 selector = HUB_LED_OFF;
200 mode = INDICATOR_GREEN_BLINK;
201 break;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK:
204 selector = HUB_LED_AMBER;
205 mode = INDICATOR_AMBER_BLINK_OFF;
206 break;
207 case INDICATOR_AMBER_BLINK_OFF:
208 selector = HUB_LED_OFF;
209 mode = INDICATOR_AMBER_BLINK;
210 break;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK:
213 selector = HUB_LED_GREEN;
214 mode = INDICATOR_ALT_BLINK_OFF;
215 break;
216 case INDICATOR_ALT_BLINK_OFF:
217 selector = HUB_LED_AMBER;
218 mode = INDICATOR_ALT_BLINK;
219 break;
220 default:
221 continue;
222 }
223 if (selector != HUB_LED_AUTO)
224 changed = 1;
225 set_port_led(hub, i + 1, selector);
226 hub->indicator[i] = mode;
227 }
228 if (!changed && blinkenlights) {
229 cursor++;
230 cursor %= hub->descriptor->bNbrPorts;
231 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232 hub->indicator[cursor] = INDICATOR_CYCLE;
233 changed++;
234 }
235 if (changed)
236 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237}
238
239/* use a short timeout for hub/port status fetches */
240#define USB_STS_TIMEOUT 1000
241#define USB_STS_RETRIES 5
242
243/*
244 * USB 2.0 spec Section 11.24.2.6
245 */
246static int get_hub_status(struct usb_device *hdev,
247 struct usb_hub_status *data)
248{
249 int i, status = -ETIMEDOUT;
250
251 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254 data, sizeof(*data), USB_STS_TIMEOUT);
255 }
256 return status;
257}
258
259/*
260 * USB 2.0 spec Section 11.24.2.7
261 */
262static int get_port_status(struct usb_device *hdev, int port1,
263 struct usb_port_status *data)
264{
265 int i, status = -ETIMEDOUT;
266
267 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270 data, sizeof(*data), USB_STS_TIMEOUT);
271 }
272 return status;
273}
274
275static void kick_khubd(struct usb_hub *hub)
276{
277 unsigned long flags;
278
279 spin_lock_irqsave(&hub_event_lock, flags);
280 if (list_empty(&hub->event_list)) {
281 list_add_tail(&hub->event_list, &hub_event_list);
282 wake_up(&khubd_wait);
283 }
284 spin_unlock_irqrestore(&hub_event_lock, flags);
285}
286
287void usb_kick_khubd(struct usb_device *hdev)
288{
289 kick_khubd(hdev_to_hub(hdev));
290}
291
292
293/* completion function, fires on port status changes and various faults */
294static void hub_irq(struct urb *urb, struct pt_regs *regs)
295{
296 struct usb_hub *hub = (struct usb_hub *)urb->context;
297 int status;
298 int i;
299 unsigned long bits;
300
301 switch (urb->status) {
302 case -ENOENT: /* synchronous unlink */
303 case -ECONNRESET: /* async unlink */
304 case -ESHUTDOWN: /* hardware going away */
305 return;
306
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310 if ((++hub->nerrors < 10) || hub->error)
311 goto resubmit;
312 hub->error = urb->status;
313 /* FALL THROUGH */
314
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
317 bits = 0;
318 for (i = 0; i < urb->actual_length; ++i)
319 bits |= ((unsigned long) ((*hub->buffer)[i]))
320 << (i*8);
321 hub->event_bits[0] = bits;
322 break;
323 }
324
325 hub->nerrors = 0;
326
327 /* Something happened, let khubd figure it out */
328 kick_khubd(hub);
329
330resubmit:
331 if (hub->quiescing)
332 return;
333
334 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335 && status != -ENODEV && status != -EPERM)
336 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337}
338
339/* USB 2.0 spec Section 11.24.2.3 */
340static inline int
341hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342{
343 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345 tt, NULL, 0, 1000);
346}
347
348/*
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
353 */
354static void hub_tt_kevent (void *arg)
355{
356 struct usb_hub *hub = arg;
357 unsigned long flags;
358
359 spin_lock_irqsave (&hub->tt.lock, flags);
360 while (!list_empty (&hub->tt.clear_list)) {
361 struct list_head *temp;
362 struct usb_tt_clear *clear;
363 struct usb_device *hdev = hub->hdev;
364 int status;
365
366 temp = hub->tt.clear_list.next;
367 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368 list_del (&clear->clear_list);
369
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub->tt.lock, flags);
372 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373 spin_lock_irqsave (&hub->tt.lock, flags);
374
375 if (status)
376 dev_err (&hdev->dev,
377 "clear tt %d (%04x) error %d\n",
378 clear->tt, clear->devinfo, status);
1bc3c9e1 379 kfree(clear);
1da177e4
LT		 380 }
381 spin_unlock_irqrestore (&hub->tt.lock, flags);
382}
383
384/**
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
388 *
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
392 * interrupt context.
393 *
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
396 */
397void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398{
399 struct usb_tt *tt = udev->tt;
400 unsigned long flags;
401 struct usb_tt_clear *clear;
402
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
406 */
407 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
410 return;
411 }
412
413 /* info that CLEAR_TT_BUFFER needs */
414 clear->tt = tt->multi ? udev->ttport : 1;
415 clear->devinfo = usb_pipeendpoint (pipe);
416 clear->devinfo |= udev->devnum << 4;
417 clear->devinfo |= usb_pipecontrol (pipe)
418 ? (USB_ENDPOINT_XFER_CONTROL << 11)
419 : (USB_ENDPOINT_XFER_BULK << 11);
420 if (usb_pipein (pipe))
421 clear->devinfo |= 1 << 15;
422
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt->lock, flags);
425 list_add_tail (&clear->clear_list, &tt->clear_list);
426 schedule_work (&tt->kevent);
427 spin_unlock_irqrestore (&tt->lock, flags);
428}
429
430static void hub_power_on(struct usb_hub *hub)
431{
432 int port1;
b789696a 433 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
74ad9bd2 434 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 435
436 /* if hub supports power switching, enable power on each port */
74ad9bd2 437 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
1da177e4
LT		 438 dev_dbg(hub->intfdev, "enabling power on all ports\n");
439 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
440 set_port_feature(hub->hdev, port1,
441 USB_PORT_FEAT_POWER);
442 }
443
b789696a
DB		 444 /* Wait at least 100 msec for power to become stable */
445 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 446}
447
979d5199 448static inline void __hub_quiesce(struct usb_hub *hub)
1da177e4 449{
979d5199 450 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 451 hub->quiescing = 1;
c9f89fa4 452 hub->activating = 0;
979d5199
DB		 453 hub->resume_root_hub = 0;
454}
455
456static void hub_quiesce(struct usb_hub *hub)
457{
458 /* (blocking) stop khubd and related activity */
459 __hub_quiesce(hub);
1da177e4
LT		 460 usb_kill_urb(hub->urb);
461 if (hub->has_indicators)
462 cancel_delayed_work(&hub->leds);
463 if (hub->has_indicators || hub->tt.hub)
464 flush_scheduled_work();
465}
466
467static void hub_activate(struct usb_hub *hub)
468{
469 int status;
470
471 hub->quiescing = 0;
472 hub->activating = 1;
979d5199 473 hub->resume_root_hub = 0;
1da177e4
LT		 474 status = usb_submit_urb(hub->urb, GFP_NOIO);
475 if (status < 0)
476 dev_err(hub->intfdev, "activate --> %d\n", status);
477 if (hub->has_indicators && blinkenlights)
478 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
479
480 /* scan all ports ASAP */
481 kick_khubd(hub);
482}
483
484static int hub_hub_status(struct usb_hub *hub,
485 u16 *status, u16 *change)
486{
487 int ret;
488
489 ret = get_hub_status(hub->hdev, &hub->status->hub);
490 if (ret < 0)
491 dev_err (hub->intfdev,
492 "%s failed (err = %d)\n", __FUNCTION__, ret);
493 else {
494 *status = le16_to_cpu(hub->status->hub.wHubStatus);
495 *change = le16_to_cpu(hub->status->hub.wHubChange);
496 ret = 0;
497 }
498 return ret;
499}
500
8b28c752
AS		 501static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
502{
503 struct usb_device *hdev = hub->hdev;
504 int ret;
505
506 if (hdev->children[port1-1] && set_state) {
507 usb_set_device_state(hdev->children[port1-1],
508 USB_STATE_NOTATTACHED);
509 }
510 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
511 if (ret)
512 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
513 port1, ret);
514
515 return ret;
516}
517
7d069b7d
AS		 518
519/* caller has locked the hub device */
520static void hub_pre_reset(struct usb_hub *hub, int disable_ports)
521{
522 struct usb_device *hdev = hub->hdev;
523 int port1;
524
525 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
526 if (hdev->children[port1 - 1]) {
527 usb_disconnect(&hdev->children[port1 - 1]);
528 if (disable_ports)
529 hub_port_disable(hub, port1, 0);
530 }
531 }
532 hub_quiesce(hub);
533}
534
535/* caller has locked the hub device */
536static void hub_post_reset(struct usb_hub *hub)
537{
538 hub_activate(hub);
539 hub_power_on(hub);
540}
541
542
1da177e4
LT		 543static int hub_configure(struct usb_hub *hub,
544 struct usb_endpoint_descriptor *endpoint)
545{
546 struct usb_device *hdev = hub->hdev;
547 struct device *hub_dev = hub->intfdev;
548 u16 hubstatus, hubchange;
74ad9bd2 549 u16 wHubCharacteristics;
1da177e4
LT		 550 unsigned int pipe;
551 int maxp, ret;
552 char *message;
553
554 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
555 &hub->buffer_dma);
556 if (!hub->buffer) {
557 message = "can't allocate hub irq buffer";
558 ret = -ENOMEM;
559 goto fail;
560 }
561
562 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
563 if (!hub->status) {
564 message = "can't kmalloc hub status buffer";
565 ret = -ENOMEM;
566 goto fail;
567 }
568
569 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
570 if (!hub->descriptor) {
571 message = "can't kmalloc hub descriptor";
572 ret = -ENOMEM;
573 goto fail;
574 }
575
576 /* Request the entire hub descriptor.
577 * hub->descriptor can handle USB_MAXCHILDREN ports,
578 * but the hub can/will return fewer bytes here.
579 */
580 ret = get_hub_descriptor(hdev, hub->descriptor,
581 sizeof(*hub->descriptor));
582 if (ret < 0) {
583 message = "can't read hub descriptor";
584 goto fail;
585 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
586 message = "hub has too many ports!";
587 ret = -ENODEV;
588 goto fail;
589 }
590
591 hdev->maxchild = hub->descriptor->bNbrPorts;
592 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
593 (hdev->maxchild == 1) ? "" : "s");
594
74ad9bd2 595 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 596
74ad9bd2 597 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 598 int i;
599 char portstr [USB_MAXCHILDREN + 1];
600
601 for (i = 0; i < hdev->maxchild; i++)
602 portstr[i] = hub->descriptor->DeviceRemovable
603 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
604 ? 'F' : 'R';
605 portstr[hdev->maxchild] = 0;
606 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
607 } else
608 dev_dbg(hub_dev, "standalone hub\n");
609
74ad9bd2 610 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 611 case 0x00:
612 dev_dbg(hub_dev, "ganged power switching\n");
613 break;
614 case 0x01:
615 dev_dbg(hub_dev, "individual port power switching\n");
616 break;
617 case 0x02:
618 case 0x03:
619 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
620 break;
621 }
622
74ad9bd2 623 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 624 case 0x00:
625 dev_dbg(hub_dev, "global over-current protection\n");
626 break;
627 case 0x08:
628 dev_dbg(hub_dev, "individual port over-current protection\n");
629 break;
630 case 0x10:
631 case 0x18:
632 dev_dbg(hub_dev, "no over-current protection\n");
633 break;
634 }
635
636 spin_lock_init (&hub->tt.lock);
637 INIT_LIST_HEAD (&hub->tt.clear_list);
638 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
639 switch (hdev->descriptor.bDeviceProtocol) {
640 case 0:
641 break;
642 case 1:
643 dev_dbg(hub_dev, "Single TT\n");
644 hub->tt.hub = hdev;
645 break;
646 case 2:
647 ret = usb_set_interface(hdev, 0, 1);
648 if (ret == 0) {
649 dev_dbg(hub_dev, "TT per port\n");
650 hub->tt.multi = 1;
651 } else
652 dev_err(hub_dev, "Using single TT (err %d)\n",
653 ret);
654 hub->tt.hub = hdev;
655 break;
656 default:
657 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
658 hdev->descriptor.bDeviceProtocol);
659 break;
660 }
661
e09711ae 662 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 663 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae 664 case HUB_TTTT_8_BITS:
665 if (hdev->descriptor.bDeviceProtocol != 0) {
666 hub->tt.think_time = 666;
667 dev_dbg(hub_dev, "TT requires at most %d "
668 "FS bit times (%d ns)\n",
669 8, hub->tt.think_time);
670 }
1da177e4 671 break;
e09711ae 672 case HUB_TTTT_16_BITS:
673 hub->tt.think_time = 666 * 2;
674 dev_dbg(hub_dev, "TT requires at most %d "
675 "FS bit times (%d ns)\n",
676 16, hub->tt.think_time);
1da177e4 677 break;
e09711ae 678 case HUB_TTTT_24_BITS:
679 hub->tt.think_time = 666 * 3;
680 dev_dbg(hub_dev, "TT requires at most %d "
681 "FS bit times (%d ns)\n",
682 24, hub->tt.think_time);
1da177e4 683 break;
e09711ae 684 case HUB_TTTT_32_BITS:
685 hub->tt.think_time = 666 * 4;
686 dev_dbg(hub_dev, "TT requires at most %d "
687 "FS bit times (%d ns)\n",
688 32, hub->tt.think_time);
1da177e4
LT		 689 break;
690 }
691
692 /* probe() zeroes hub->indicator[] */
74ad9bd2 693 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 694 hub->has_indicators = 1;
695 dev_dbg(hub_dev, "Port indicators are supported\n");
696 }
697
698 dev_dbg(hub_dev, "power on to power good time: %dms\n",
699 hub->descriptor->bPwrOn2PwrGood * 2);
700
701 /* power budgeting mostly matters with bus-powered hubs,
702 * and battery-powered root hubs (may provide just 8 mA).
703 */
704 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
705 if (ret < 0) {
706 message = "can't get hub status";
707 goto fail;
708 }
7d35b929
AS		 709 le16_to_cpus(&hubstatus);
710 if (hdev == hdev->bus->root_hub) {
711 struct usb_hcd *hcd =
712 container_of(hdev->bus, struct usb_hcd, self);
713
714 hub->power_budget = min(500u, hcd->power_budget) / 2;
715 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 716 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
717 hub->descriptor->bHubContrCurrent);
718 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
719 / 2;
7d35b929
AS		 720 }
721 if (hub->power_budget)
1da177e4
LT		 722 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
723 hub->power_budget * 2);
1da177e4
LT		 724
725
726 ret = hub_hub_status(hub, &hubstatus, &hubchange);
727 if (ret < 0) {
728 message = "can't get hub status";
729 goto fail;
730 }
731
732 /* local power status reports aren't always correct */
733 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
734 dev_dbg(hub_dev, "local power source is %s\n",
735 (hubstatus & HUB_STATUS_LOCAL_POWER)
736 ? "lost (inactive)" : "good");
737
74ad9bd2 738 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 739 dev_dbg(hub_dev, "%sover-current condition exists\n",
740 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
741
742 /* set up the interrupt endpoint */
743 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
744 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
745
746 if (maxp > sizeof(*hub->buffer))
747 maxp = sizeof(*hub->buffer);
748
749 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
750 if (!hub->urb) {
751 message = "couldn't allocate interrupt urb";
752 ret = -ENOMEM;
753 goto fail;
754 }
755
756 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
757 hub, endpoint->bInterval);
758 hub->urb->transfer_dma = hub->buffer_dma;
759 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
760
761 /* maybe cycle the hub leds */
762 if (hub->has_indicators && blinkenlights)
763 hub->indicator [0] = INDICATOR_CYCLE;
764
765 hub_power_on(hub);
766 hub_activate(hub);
767 return 0;
768
769fail:
770 dev_err (hub_dev, "config failed, %s (err %d)\n",
771 message, ret);
772 /* hub_disconnect() frees urb and descriptor */
773 return ret;
774}
775
776static unsigned highspeed_hubs;
777
778static void hub_disconnect(struct usb_interface *intf)
779{
780 struct usb_hub *hub = usb_get_intfdata (intf);
781 struct usb_device *hdev;
782
8b28c752 783 usb_set_intfdata (intf, NULL);
1da177e4
LT		 784 hdev = hub->hdev;
785
786 if (hdev->speed == USB_SPEED_HIGH)
787 highspeed_hubs--;
788
7d069b7d
AS		 789 /* Disconnect all children and quiesce the hub */
790 hub_pre_reset(hub, 1);
791
1da177e4
LT		 792 usb_free_urb(hub->urb);
793 hub->urb = NULL;
794
795 spin_lock_irq(&hub_event_lock);
796 list_del_init(&hub->event_list);
797 spin_unlock_irq(&hub_event_lock);
798
1bc3c9e1
JJ		 799 kfree(hub->descriptor);
800 hub->descriptor = NULL;
1da177e4 801
1bc3c9e1
JJ		 802 kfree(hub->status);
803 hub->status = NULL;
1da177e4
LT		 804
805 if (hub->buffer) {
806 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
807 hub->buffer_dma);
808 hub->buffer = NULL;
809 }
810
7d069b7d 811 kfree(hub);
1da177e4
LT		 812}
813
814static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
815{
816 struct usb_host_interface *desc;
817 struct usb_endpoint_descriptor *endpoint;
818 struct usb_device *hdev;
819 struct usb_hub *hub;
820
821 desc = intf->cur_altsetting;
822 hdev = interface_to_usbdev(intf);
823
824 /* Some hubs have a subclass of 1, which AFAICT according to the */
825 /* specs is not defined, but it works */
826 if ((desc->desc.bInterfaceSubClass != 0) &&
827 (desc->desc.bInterfaceSubClass != 1)) {
828descriptor_error:
829 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
830 return -EIO;
831 }
832
833 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
834 if (desc->desc.bNumEndpoints != 1)
835 goto descriptor_error;
836
837 endpoint = &desc->endpoint[0].desc;
838
839 /* Output endpoint? Curiouser and curiouser.. */
840 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
841 goto descriptor_error;
842
843 /* If it's not an interrupt endpoint, we'd better punt! */
844 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
845 != USB_ENDPOINT_XFER_INT)
846 goto descriptor_error;
847
848 /* We found a hub */
849 dev_info (&intf->dev, "USB hub found\n");
850
0a1ef3b5 851 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 852 if (!hub) {
853 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
854 return -ENOMEM;
855 }
856
1da177e4
LT		 857 INIT_LIST_HEAD(&hub->event_list);
858 hub->intfdev = &intf->dev;
859 hub->hdev = hdev;
860 INIT_WORK(&hub->leds, led_work, hub);
861
862 usb_set_intfdata (intf, hub);
863
864 if (hdev->speed == USB_SPEED_HIGH)
865 highspeed_hubs++;
866
867 if (hub_configure(hub, endpoint) >= 0)
868 return 0;
869
870 hub_disconnect (intf);
871 return -ENODEV;
872}
873
874static int
875hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
876{
877 struct usb_device *hdev = interface_to_usbdev (intf);
878
879 /* assert ifno == 0 (part of hub spec) */
880 switch (code) {
881 case USBDEVFS_HUB_PORTINFO: {
882 struct usbdevfs_hub_portinfo *info = user_data;
883 int i;
884
885 spin_lock_irq(&device_state_lock);
886 if (hdev->devnum <= 0)
887 info->nports = 0;
888 else {
889 info->nports = hdev->maxchild;
890 for (i = 0; i < info->nports; i++) {
891 if (hdev->children[i] == NULL)
892 info->port[i] = 0;
893 else
894 info->port[i] =
895 hdev->children[i]->devnum;
896 }
897 }
898 spin_unlock_irq(&device_state_lock);
899
900 return info->nports + 1;
901 }
902
903 default:
904 return -ENOSYS;
905 }
906}
907
1da177e4
LT		 908
909/* grab device/port lock, returning index of that port (zero based).
910 * protects the upstream link used by this device from concurrent
911 * tree operations like suspend, resume, reset, and disconnect, which
912 * apply to everything downstream of a given port.
913 */
914static int locktree(struct usb_device *udev)
915{
916 int t;
917 struct usb_device *hdev;
918
919 if (!udev)
920 return -ENODEV;
921
922 /* root hub is always the first lock in the series */
923 hdev = udev->parent;
924 if (!hdev) {
925 usb_lock_device(udev);
926 return 0;
927 }
928
929 /* on the path from root to us, lock everything from
930 * top down, dropping parent locks when not needed
931 */
932 t = locktree(hdev);
933 if (t < 0)
934 return t;
935 for (t = 0; t < hdev->maxchild; t++) {
936 if (hdev->children[t] == udev) {
937 /* everything is fail-fast once disconnect
938 * processing starts
939 */
940 if (udev->state == USB_STATE_NOTATTACHED)
941 break;
942
943 /* when everyone grabs locks top->bottom,
944 * non-overlapping work may be concurrent
945 */
9ad3d6cc
AS		 946 usb_lock_device(udev);
947 usb_unlock_device(hdev);
1da177e4
LT		 948 return t + 1;
949 }
950 }
951 usb_unlock_device(hdev);
952 return -ENODEV;
953}
954
955static void recursively_mark_NOTATTACHED(struct usb_device *udev)
956{
957 int i;
958
959 for (i = 0; i < udev->maxchild; ++i) {
960 if (udev->children[i])
961 recursively_mark_NOTATTACHED(udev->children[i]);
962 }
963 udev->state = USB_STATE_NOTATTACHED;
964}
965
966/**
967 * usb_set_device_state - change a device's current state (usbcore, hcds)
968 * @udev: pointer to device whose state should be changed
969 * @new_state: new state value to be stored
970 *
971 * udev->state is _not_ fully protected by the device lock. Although
972 * most transitions are made only while holding the lock, the state can
973 * can change to USB_STATE_NOTATTACHED at almost any time. This
974 * is so that devices can be marked as disconnected as soon as possible,
975 * without having to wait for any semaphores to be released. As a result,
976 * all changes to any device's state must be protected by the
977 * device_state_lock spinlock.
978 *
979 * Once a device has been added to the device tree, all changes to its state
980 * should be made using this routine. The state should _not_ be set directly.
981 *
982 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
983 * Otherwise udev->state is set to new_state, and if new_state is
984 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
985 * to USB_STATE_NOTATTACHED.
986 */
987void usb_set_device_state(struct usb_device *udev,
988 enum usb_device_state new_state)
989{
990 unsigned long flags;
991
992 spin_lock_irqsave(&device_state_lock, flags);
993 if (udev->state == USB_STATE_NOTATTACHED)
994 ; /* do nothing */
b94dc6b5 995 else if (new_state != USB_STATE_NOTATTACHED) {
1da177e4 996 udev->state = new_state;
b94dc6b5
DB		 997 if (new_state == USB_STATE_CONFIGURED)
998 device_init_wakeup(&udev->dev,
999 (udev->actconfig->desc.bmAttributes
1000 & USB_CONFIG_ATT_WAKEUP));
1001 else if (new_state != USB_STATE_SUSPENDED)
1002 device_init_wakeup(&udev->dev, 0);
1003 } else
1da177e4
LT		 1004 recursively_mark_NOTATTACHED(udev);
1005 spin_unlock_irqrestore(&device_state_lock, flags);
1006}
1007EXPORT_SYMBOL(usb_set_device_state);
1008
1009
1c50c317
AS		 1010#ifdef CONFIG_PM
1011
1012/**
1013 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1014 * @rhdev: struct usb_device for the root hub
1015 *
1016 * The USB host controller driver calls this function when its root hub
1017 * is resumed and Vbus power has been interrupted or the controller
1018 * has been reset. The routine marks all the children of the root hub
1019 * as NOTATTACHED and marks logical connect-change events on their ports.
1020 */
1021void usb_root_hub_lost_power(struct usb_device *rhdev)
1022{
1023 struct usb_hub *hub;
1024 int port1;
1025 unsigned long flags;
1026
1027 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1028 spin_lock_irqsave(&device_state_lock, flags);
1029 hub = hdev_to_hub(rhdev);
1030 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1031 if (rhdev->children[port1 - 1]) {
1032 recursively_mark_NOTATTACHED(
1033 rhdev->children[port1 - 1]);
1034 set_bit(port1, hub->change_bits);
1035 }
1036 }
1037 spin_unlock_irqrestore(&device_state_lock, flags);
1038}
1039EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1040
1041#endif
1042
1da177e4
LT		 1043static void choose_address(struct usb_device *udev)
1044{
1045 int devnum;
1046 struct usb_bus *bus = udev->bus;
1047
1048 /* If khubd ever becomes multithreaded, this will need a lock */
1049
1050 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1051 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1052 bus->devnum_next);
1053 if (devnum >= 128)
1054 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1055
1056 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1057
1058 if (devnum < 128) {
1059 set_bit(devnum, bus->devmap.devicemap);
1060 udev->devnum = devnum;
1061 }
1062}
1063
1064static void release_address(struct usb_device *udev)
1065{
1066 if (udev->devnum > 0) {
1067 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1068 udev->devnum = -1;
1069 }
1070}
1071
1072/**
1073 * usb_disconnect - disconnect a device (usbcore-internal)
1074 * @pdev: pointer to device being disconnected
1075 * Context: !in_interrupt ()
1076 *
1077 * Something got disconnected. Get rid of it and all of its children.
1078 *
1079 * If *pdev is a normal device then the parent hub must already be locked.
1080 * If *pdev is a root hub then this routine will acquire the
1081 * usb_bus_list_lock on behalf of the caller.
1082 *
1083 * Only hub drivers (including virtual root hub drivers for host
1084 * controllers) should ever call this.
1085 *
1086 * This call is synchronous, and may not be used in an interrupt context.
1087 */
1088void usb_disconnect(struct usb_device **pdev)
1089{
1090 struct usb_device *udev = *pdev;
1091 int i;
1092
1093 if (!udev) {
1094 pr_debug ("%s nodev\n", __FUNCTION__);
1095 return;
1096 }
1097
1098 /* mark the device as inactive, so any further urb submissions for
1099 * this device (and any of its children) will fail immediately.
1100 * this quiesces everyting except pending urbs.
1101 */
1102 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1103 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1104
9ad3d6cc
AS		 1105 usb_lock_device(udev);
1106
1da177e4
LT		 1107 /* Free up all the children before we remove this device */
1108 for (i = 0; i < USB_MAXCHILDREN; i++) {
1109 if (udev->children[i])
1110 usb_disconnect(&udev->children[i]);
1111 }
1112
1113 /* deallocate hcd/hardware state ... nuking all pending urbs and
1114 * cleaning up all state associated with the current configuration
1115 * so that the hardware is now fully quiesced.
1116 */
1117 usb_disable_device(udev, 0);
1118
3099e75a
GKH		 1119 usb_notify_remove_device(udev);
1120
1da177e4
LT		 1121 /* Free the device number, remove the /proc/bus/usb entry and
1122 * the sysfs attributes, and delete the parent's children[]
1123 * (or root_hub) pointer.
1124 */
1125 dev_dbg (&udev->dev, "unregistering device\n");
1126 release_address(udev);
1da177e4
LT		 1127 usb_remove_sysfs_dev_files(udev);
1128
1129 /* Avoid races with recursively_mark_NOTATTACHED() */
1130 spin_lock_irq(&device_state_lock);
1131 *pdev = NULL;
1132 spin_unlock_irq(&device_state_lock);
1133
9ad3d6cc 1134 usb_unlock_device(udev);
1da177e4
LT		 1135
1136 device_unregister(&udev->dev);
1137}
1138
1139static int choose_configuration(struct usb_device *udev)
1140{
1141 int c, i;
1142
1143 /* NOTE: this should interact with hub power budgeting */
1144
1145 c = udev->config[0].desc.bConfigurationValue;
1146 if (udev->descriptor.bNumConfigurations != 1) {
1147 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1148 struct usb_interface_descriptor *desc;
1149
1150 /* heuristic: Linux is more likely to have class
1151 * drivers, so avoid vendor-specific interfaces.
1152 */
1153 desc = &udev->config[i].intf_cache[0]
1154 ->altsetting->desc;
1155 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1156 continue;
1157 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1158 * MSFT needs this to be the first config; never use
1159 * it as the default unless Linux has host-side RNDIS.
1160 * A second config would ideally be CDC-Ethernet, but
1161 * may instead be the "vendor specific" CDC subset
1162 * long used by ARM Linux for sa1100 or pxa255.
1163 */
1164 if (desc->bInterfaceClass == USB_CLASS_COMM
1165 && desc->bInterfaceSubClass == 2
1166 && desc->bInterfaceProtocol == 0xff) {
1167 c = udev->config[1].desc.bConfigurationValue;
1168 continue;
1169 }
1170 c = udev->config[i].desc.bConfigurationValue;
1171 break;
1172 }
1173 dev_info(&udev->dev,
1174 "configuration #%d chosen from %d choices\n",
1175 c, udev->descriptor.bNumConfigurations);
1176 }
1177 return c;
1178}
1179
1180#ifdef DEBUG
1181static void show_string(struct usb_device *udev, char *id, char *string)
1182{
1183 if (!string)
1184 return;
1185 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1186}
1187
1188#else
1189static inline void show_string(struct usb_device *udev, char *id, char *string)
1190{}
1191#endif
1192
1da177e4
LT		 1193
1194#ifdef CONFIG_USB_OTG
1195#include "otg_whitelist.h"
1196#endif
1197
1198/**
1199 * usb_new_device - perform initial device setup (usbcore-internal)
1200 * @udev: newly addressed device (in ADDRESS state)
1201 *
1202 * This is called with devices which have been enumerated, but not yet
1203 * configured. The device descriptor is available, but not descriptors
9ad3d6cc
AS		 1204 * for any device configuration. The caller must have locked either
1205 * the parent hub (if udev is a normal device) or else the
1da177e4
LT		 1206 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1207 * udev has already been installed, but udev is not yet visible through
1208 * sysfs or other filesystem code.
1209 *
1210 * Returns 0 for success (device is configured and listed, with its
1211 * interfaces, in sysfs); else a negative errno value.
1212 *
1213 * This call is synchronous, and may not be used in an interrupt context.
1214 *
9ad3d6cc 1215 * Only the hub driver or root-hub registrar should ever call this.
1da177e4
LT		 1216 */
1217int usb_new_device(struct usb_device *udev)
1218{
1219 int err;
1220 int c;
1221
1222 err = usb_get_configuration(udev);
1223 if (err < 0) {
1224 dev_err(&udev->dev, "can't read configurations, error %d\n",
1225 err);
1226 goto fail;
1227 }
1228
1229 /* read the standard strings and cache them if present */
4f62efe6
AS		 1230 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1231 udev->manufacturer = usb_cache_string(udev,
1232 udev->descriptor.iManufacturer);
1233 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1234
1235 /* Tell the world! */
1236 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1237 "SerialNumber=%d\n",
1238 udev->descriptor.iManufacturer,
1239 udev->descriptor.iProduct,
1240 udev->descriptor.iSerialNumber);
1241 show_string(udev, "Product", udev->product);
1242 show_string(udev, "Manufacturer", udev->manufacturer);
1243 show_string(udev, "SerialNumber", udev->serial);
1244
1245#ifdef CONFIG_USB_OTG
1246 /*
1247 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1248 * to wake us after we've powered off VBUS; and HNP, switching roles
1249 * "host" to "peripheral". The OTG descriptor helps figure this out.
1250 */
1251 if (!udev->bus->is_b_host
1252 && udev->config
1253 && udev->parent == udev->bus->root_hub) {
1254 struct usb_otg_descriptor *desc = 0;
1255 struct usb_bus *bus = udev->bus;
1256
1257 /* descriptor may appear anywhere in config */
1258 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1259 le16_to_cpu(udev->config[0].desc.wTotalLength),
1260 USB_DT_OTG, (void **) &desc) == 0) {
1261 if (desc->bmAttributes & USB_OTG_HNP) {
1262 unsigned port1;
1263 struct usb_device *root = udev->parent;
1264
1265 for (port1 = 1; port1 <= root->maxchild;
1266 port1++) {
1267 if (root->children[port1-1] == udev)
1268 break;
1269 }
1270
1271 dev_info(&udev->dev,
1272 "Dual-Role OTG device on %sHNP port\n",
1273 (port1 == bus->otg_port)
1274 ? "" : "non-");
1275
1276 /* enable HNP before suspend, it's simpler */
1277 if (port1 == bus->otg_port)
1278 bus->b_hnp_enable = 1;
1279 err = usb_control_msg(udev,
1280 usb_sndctrlpipe(udev, 0),
1281 USB_REQ_SET_FEATURE, 0,
1282 bus->b_hnp_enable
1283 ? USB_DEVICE_B_HNP_ENABLE
1284 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1285 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1286 if (err < 0) {
1287 /* OTG MESSAGE: report errors here,
1288 * customize to match your product.
1289 */
1290 dev_info(&udev->dev,
1291 "can't set HNP mode; %d\n",
1292 err);
1293 bus->b_hnp_enable = 0;
1294 }
1295 }
1296 }
1297 }
1298
1299 if (!is_targeted(udev)) {
1300
1301 /* Maybe it can talk to us, though we can't talk to it.
1302 * (Includes HNP test device.)
1303 */
1304 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
390a8c34
DB		 1305 static int __usb_suspend_device(struct usb_device *,
1306 int port1);
1307 err = __usb_suspend_device(udev, udev->bus->otg_port);
1da177e4
LT		 1308 if (err < 0)
1309 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1310 }
1311 err = -ENODEV;
1312 goto fail;
1313 }
1314#endif
1315
1316 /* put device-specific files into sysfs */
1317 err = device_add (&udev->dev);
1318 if (err) {
1319 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1320 goto fail;
1321 }
1322 usb_create_sysfs_dev_files (udev);
1323
9ad3d6cc
AS		 1324 usb_lock_device(udev);
1325
1da177e4
LT		 1326 /* choose and set the configuration. that registers the interfaces
1327 * with the driver core, and lets usb device drivers bind to them.
1328 */
1329 c = choose_configuration(udev);
1330 if (c < 0)
1331 dev_warn(&udev->dev,
1332 "can't choose an initial configuration\n");
1333 else {
1334 err = usb_set_configuration(udev, c);
1335 if (err) {
1336 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1337 c, err);
1338 usb_remove_sysfs_dev_files(udev);
1339 device_del(&udev->dev);
1340 goto fail;
1341 }
1342 }
1343
1344 /* USB device state == configured ... usable */
3099e75a 1345 usb_notify_add_device(udev);
1da177e4 1346
9ad3d6cc
AS		 1347 usb_unlock_device(udev);
1348
1da177e4
LT		 1349 return 0;
1350
1351fail:
1352 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1353 return err;
1354}
1355
1356
1357static int hub_port_status(struct usb_hub *hub, int port1,
1358 u16 *status, u16 *change)
1359{
1360 int ret;
1361
1362 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1363 if (ret < 0)
1364 dev_err (hub->intfdev,
1365 "%s failed (err = %d)\n", __FUNCTION__, ret);
1366 else {
1367 *status = le16_to_cpu(hub->status->port.wPortStatus);
1368 *change = le16_to_cpu(hub->status->port.wPortChange);
1369 ret = 0;
1370 }
1371 return ret;
1372}
1373
1374#define PORT_RESET_TRIES 5
1375#define SET_ADDRESS_TRIES 2
1376#define GET_DESCRIPTOR_TRIES 2
1377#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1378#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1379
1380#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1381#define HUB_SHORT_RESET_TIME 10
1382#define HUB_LONG_RESET_TIME 200
1383#define HUB_RESET_TIMEOUT 500
1384
1385static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1386 struct usb_device *udev, unsigned int delay)
1387{
1388 int delay_time, ret;
1389 u16 portstatus;
1390 u16 portchange;
1391
1392 for (delay_time = 0;
1393 delay_time < HUB_RESET_TIMEOUT;
1394 delay_time += delay) {
1395 /* wait to give the device a chance to reset */
1396 msleep(delay);
1397
1398 /* read and decode port status */
1399 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1400 if (ret < 0)
1401 return ret;
1402
1403 /* Device went away? */
1404 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1405 return -ENOTCONN;
1406
1407 /* bomb out completely if something weird happened */
1408 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1409 return -EINVAL;
1410
1411 /* if we`ve finished resetting, then break out of the loop */
1412 if (!(portstatus & USB_PORT_STAT_RESET) &&
1413 (portstatus & USB_PORT_STAT_ENABLE)) {
1414 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1415 udev->speed = USB_SPEED_HIGH;
1416 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1417 udev->speed = USB_SPEED_LOW;
1418 else
1419 udev->speed = USB_SPEED_FULL;
1420 return 0;
1421 }
1422
1423 /* switch to the long delay after two short delay failures */
1424 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1425 delay = HUB_LONG_RESET_TIME;
1426
1427 dev_dbg (hub->intfdev,
1428 "port %d not reset yet, waiting %dms\n",
1429 port1, delay);
1430 }
1431
1432 return -EBUSY;
1433}
1434
1435static int hub_port_reset(struct usb_hub *hub, int port1,
1436 struct usb_device *udev, unsigned int delay)
1437{
1438 int i, status;
1439
1440 /* Reset the port */
1441 for (i = 0; i < PORT_RESET_TRIES; i++) {
1442 status = set_port_feature(hub->hdev,
1443 port1, USB_PORT_FEAT_RESET);
1444 if (status)
1445 dev_err(hub->intfdev,
1446 "cannot reset port %d (err = %d)\n",
1447 port1, status);
1448 else {
1449 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1450 if (status && status != -ENOTCONN)
1da177e4
LT		 1451 dev_dbg(hub->intfdev,
1452 "port_wait_reset: err = %d\n",
1453 status);
1454 }
1455
1456 /* return on disconnect or reset */
1457 switch (status) {
1458 case 0:
b789696a
DB		 1459 /* TRSTRCY = 10 ms; plus some extra */
1460 msleep(10 + 40);
1da177e4
LT		 1461 /* FALL THROUGH */
1462 case -ENOTCONN:
1463 case -ENODEV:
1464 clear_port_feature(hub->hdev,
1465 port1, USB_PORT_FEAT_C_RESET);
1466 /* FIXME need disconnect() for NOTATTACHED device */
1467 usb_set_device_state(udev, status
1468 ? USB_STATE_NOTATTACHED
1469 : USB_STATE_DEFAULT);
1470 return status;
1471 }
1472
1473 dev_dbg (hub->intfdev,
1474 "port %d not enabled, trying reset again...\n",
1475 port1);
1476 delay = HUB_LONG_RESET_TIME;
1477 }
1478
1479 dev_err (hub->intfdev,
1480 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1481 port1);
1482
1483 return status;
1484}
1485
1da177e4
LT		 1486/*
1487 * Disable a port and mark a logical connnect-change event, so that some
1488 * time later khubd will disconnect() any existing usb_device on the port
1489 * and will re-enumerate if there actually is a device attached.
1490 */
1491static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1492{
1493 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1494 hub_port_disable(hub, port1, 1);
1495
1496 /* FIXME let caller ask to power down the port:
1497 * - some devices won't enumerate without a VBUS power cycle
1498 * - SRP saves power that way
390a8c34 1499 * - ... new call, TBD ...
1da177e4
LT		 1500 * That's easy if this hub can switch power per-port, and
1501 * khubd reactivates the port later (timer, SRP, etc).
1502 * Powerdown must be optional, because of reset/DFU.
1503 */
1504
1505 set_bit(port1, hub->change_bits);
1506 kick_khubd(hub);
1507}
1508
1509
1510#ifdef CONFIG_USB_SUSPEND
1511
1512/*
1513 * Selective port suspend reduces power; most suspended devices draw
1514 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1515 * All devices below the suspended port are also suspended.
1516 *
1517 * Devices leave suspend state when the host wakes them up. Some devices
1518 * also support "remote wakeup", where the device can activate the USB
1519 * tree above them to deliver data, such as a keypress or packet. In
1520 * some cases, this wakes the USB host.
1521 */
1522static int hub_port_suspend(struct usb_hub *hub, int port1,
1523 struct usb_device *udev)
1524{
1525 int status;
1526
1527 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1528
1529 /* enable remote wakeup when appropriate; this lets the device
1530 * wake up the upstream hub (including maybe the root hub).
1531 *
1532 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1533 * we don't explicitly enable it here.
1534 */
b94dc6b5 1535 if (device_may_wakeup(&udev->dev)) {
1da177e4
LT		 1536 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1537 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1538 USB_DEVICE_REMOTE_WAKEUP, 0,
1539 NULL, 0,
1540 USB_CTRL_SET_TIMEOUT);
1541 if (status)
1542 dev_dbg(&udev->dev,
1543 "won't remote wakeup, status %d\n",
1544 status);
1545 }
1546
1547 /* see 7.1.7.6 */
1548 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1549 if (status) {
1550 dev_dbg(hub->intfdev,
1551 "can't suspend port %d, status %d\n",
1552 port1, status);
1553 /* paranoia: "should not happen" */
1554 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1555 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1556 USB_DEVICE_REMOTE_WAKEUP, 0,
1557 NULL, 0,
1558 USB_CTRL_SET_TIMEOUT);
1559 } else {
1560 /* device has up to 10 msec to fully suspend */
1561 dev_dbg(&udev->dev, "usb suspend\n");
1562 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1563 msleep(10);
1564 }
1565 return status;
1566}
1567
1568/*
1569 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1570 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1571 * State transitions include:
1572 *
1573 * - suspend, resume ... when the VBUS power link stays live
1574 * - suspend, disconnect ... VBUS lost
1575 *
1576 * Once VBUS drop breaks the circuit, the port it's using has to go through
1577 * normal re-enumeration procedures, starting with enabling VBUS power.
1578 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1579 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1580 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1581 *
1582 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1583 * the root hub for their bus goes into global suspend ... so we don't
1584 * (falsely) update the device power state to say it suspended.
1da177e4 1585 */
390a8c34 1586static int __usb_suspend_device (struct usb_device *udev, int port1)
1da177e4 1587{
f3f3253d 1588 int status = 0;
1da177e4
LT		 1589
1590 /* caller owns the udev device lock */
1591 if (port1 < 0)
1592 return port1;
1593
1594 if (udev->state == USB_STATE_SUSPENDED
1595 || udev->state == USB_STATE_NOTATTACHED) {
1596 return 0;
1597 }
1598
c9f89fa4 1599 /* all interfaces must already be suspended */
1da177e4
LT		 1600 if (udev->actconfig) {
1601 int i;
1602
1603 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1604 struct usb_interface *intf;
1da177e4
LT		 1605
1606 intf = udev->actconfig->interface[i];
c9f89fa4
DB		 1607 if (is_active(intf)) {
1608 dev_dbg(&intf->dev, "nyet suspended\n");
1609 return -EBUSY;
1da177e4
LT		 1610 }
1611 }
1612 }
1613
f3f3253d
DB		 1614 /* we only change a device's upstream USB link.
1615 * root hubs have no upstream USB link.
1da177e4 1616 */
f3f3253d 1617 if (udev->parent)
1da177e4
LT		 1618 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1619 udev);
1620
1621 if (status == 0)
390a8c34 1622 udev->dev.power.power_state = PMSG_SUSPEND;
1da177e4
LT		 1623 return status;
1624}
1625
f3f3253d
DB		 1626#endif
1627
5edbfb7c 1628/*
1da177e4
LT		 1629 * usb_suspend_device - suspend a usb device
1630 * @udev: device that's no longer in active use
5edbfb7c 1631 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1632 *
1633 * Suspends a USB device that isn't in active use, conserving power.
1634 * Devices may wake out of a suspend, if anything important happens,
1635 * using the remote wakeup mechanism. They may also be taken out of
1636 * suspend by the host, using usb_resume_device(). It's also routine
1637 * to disconnect devices while they are suspended.
1638 *
390a8c34
DB		 1639 * This only affects the USB hardware for a device; its interfaces
1640 * (and, for hubs, child devices) must already have been suspended.
1641 *
1da177e4
LT		 1642 * Suspending OTG devices may trigger HNP, if that's been enabled
1643 * between a pair of dual-role devices. That will change roles, such
1644 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1645 *
1646 * Returns 0 on success, else negative errno.
1647 */
390a8c34 1648int usb_suspend_device(struct usb_device *udev)
1da177e4 1649{
f3f3253d 1650#ifdef CONFIG_USB_SUSPEND
1da177e4
LT		 1651 int port1, status;
1652
1653 port1 = locktree(udev);
1654 if (port1 < 0)
1655 return port1;
1656
390a8c34 1657 status = __usb_suspend_device(udev, port1);
1da177e4
LT		 1658 usb_unlock_device(udev);
1659 return status;
f3f3253d
DB		 1660#else
1661 /* NOTE: udev->state unchanged, it's not lying ... */
1662 udev->dev.power.power_state = PMSG_SUSPEND;
1663 return 0;
1664#endif
1da177e4 1665}
f3f3253d 1666
1da177e4 1667/*
390a8c34
DB		 1668 * If the USB "suspend" state is in use (rather than "global suspend"),
1669 * many devices will be individually taken out of suspend state using
1670 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1671 * hardware resume signaling is finished, either because of selective
1672 * resume (by host) or remote wakeup (by device) ... now see what changed
1673 * in the tree that's rooted at this device.
1674 */
f3f3253d 1675static int finish_device_resume(struct usb_device *udev)
1da177e4
LT		 1676{
1677 int status;
1678 u16 devstatus;
1679
1680 /* caller owns the udev device lock */
f3f3253d 1681 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1682
1683 /* usb ch9 identifies four variants of SUSPENDED, based on what
1684 * state the device resumes to. Linux currently won't see the
1685 * first two on the host side; they'd be inside hub_port_init()
1686 * during many timeouts, but khubd can't suspend until later.
1687 */
1688 usb_set_device_state(udev, udev->actconfig
1689 ? USB_STATE_CONFIGURED
1690 : USB_STATE_ADDRESS);
1da177e4
LT		 1691
1692 /* 10.5.4.5 says be sure devices in the tree are still there.
1693 * For now let's assume the device didn't go crazy on resume,
1694 * and device drivers will know about any resume quirks.
1695 */
1696 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1697 if (status < 0)
1698 dev_dbg(&udev->dev,
1699 "gone after usb resume? status %d\n",
1700 status);
1701 else if (udev->actconfig) {
1702 unsigned i;
dbc3887e 1703 int (*resume)(struct device *);
1da177e4
LT		 1704
1705 le16_to_cpus(&devstatus);
f3f3253d
DB		 1706 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
1707 && udev->parent) {
1da177e4
LT		 1708 status = usb_control_msg(udev,
1709 usb_sndctrlpipe(udev, 0),
1710 USB_REQ_CLEAR_FEATURE,
1711 USB_RECIP_DEVICE,
1712 USB_DEVICE_REMOTE_WAKEUP, 0,
1713 NULL, 0,
1714 USB_CTRL_SET_TIMEOUT);
1715 if (status) {
1716 dev_dbg(&udev->dev, "disable remote "
1717 "wakeup, status %d\n", status);
1718 status = 0;
1719 }
1720 }
1721
1722 /* resume interface drivers; if this is a hub, it
dbc3887e 1723 * may have a child resume event to deal with soon
1da177e4 1724 */
dbc3887e
DB		 1725 resume = udev->dev.bus->resume;
1726 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++)
1727 (void) resume(&udev->actconfig->interface[i]->dev);
1da177e4
LT		 1728 status = 0;
1729
1730 } else if (udev->devnum <= 0) {
1731 dev_dbg(&udev->dev, "bogus resume!\n");
1732 status = -EINVAL;
1733 }
1734 return status;
1735}
1736
f3f3253d
DB		 1737#ifdef CONFIG_USB_SUSPEND
1738
1da177e4
LT		 1739static int
1740hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1741{
1742 int status;
1743
1744 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1745
1746 /* see 7.1.7.7; affects power usage, but not budgeting */
1747 status = clear_port_feature(hub->hdev,
1748 port1, USB_PORT_FEAT_SUSPEND);
1749 if (status) {
1750 dev_dbg(hub->intfdev,
1751 "can't resume port %d, status %d\n",
1752 port1, status);
1753 } else {
1754 u16 devstatus;
1755 u16 portchange;
1756
1757 /* drive resume for at least 20 msec */
1758 if (udev)
1759 dev_dbg(&udev->dev, "RESUME\n");
1760 msleep(25);
1761
1762#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1763 | USB_PORT_STAT_ENABLE \
1764 | USB_PORT_STAT_CONNECTION)
1765
1766 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1767 * stop resume signaling. Then finish the resume
1768 * sequence.
1769 */
1770 devstatus = portchange = 0;
1771 status = hub_port_status(hub, port1,
1772 &devstatus, &portchange);
1773 if (status < 0
1774 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1775 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1776 ) {
1777 dev_dbg(hub->intfdev,
1778 "port %d status %04x.%04x after resume, %d\n",
1779 port1, portchange, devstatus, status);
1780 } else {
1781 /* TRSMRCY = 10 msec */
1782 msleep(10);
1783 if (udev)
f3f3253d 1784 status = finish_device_resume(udev);
1da177e4
LT		 1785 }
1786 }
1787 if (status < 0)
1788 hub_port_logical_disconnect(hub, port1);
1789
1790 return status;
1791}
1792
f3f3253d 1793#endif
1da177e4 1794
5edbfb7c 1795/*
1da177e4
LT		 1796 * usb_resume_device - re-activate a suspended usb device
1797 * @udev: device to re-activate
5edbfb7c 1798 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1799 *
1800 * This will re-activate the suspended device, increasing power usage
1801 * while letting drivers communicate again with its endpoints.
1802 * USB resume explicitly guarantees that the power session between
1803 * the host and the device is the same as it was when the device
1804 * suspended.
1805 *
1806 * Returns 0 on success, else negative errno.
1807 */
1808int usb_resume_device(struct usb_device *udev)
1809{
1810 int port1, status;
1811
1812 port1 = locktree(udev);
1813 if (port1 < 0)
1814 return port1;
1815
f3f3253d
DB		 1816#ifdef CONFIG_USB_SUSPEND
1817 /* selective resume of one downstream hub-to-device port */
1818 if (udev->parent) {
1819 if (udev->state == USB_STATE_SUSPENDED) {
1820 // NOTE swsusp may bork us, device state being wrong...
1821 // NOTE this fails if parent is also suspended...
1822 status = hub_port_resume(hdev_to_hub(udev->parent),
1823 port1, udev);
1da177e4 1824 } else
f3f3253d
DB		 1825 status = 0;
1826 } else
1827#endif
1828 status = finish_device_resume(udev);
1829 if (status < 0)
1da177e4
LT		 1830 dev_dbg(&udev->dev, "can't resume, status %d\n",
1831 status);
1da177e4
LT		 1832
1833 usb_unlock_device(udev);
1834
1835 /* rebind drivers that had no suspend() */
9ad3d6cc 1836 if (status == 0)
1da177e4 1837 bus_rescan_devices(&usb_bus_type);
1da177e4
LT		 1838 return status;
1839}
1840
1841static int remote_wakeup(struct usb_device *udev)
1842{
1843 int status = 0;
1844
f3f3253d
DB		 1845#ifdef CONFIG_USB_SUSPEND
1846
1da177e4
LT		 1847 /* don't repeat RESUME sequence if this device
1848 * was already woken up by some other task
1849 */
9ad3d6cc 1850 usb_lock_device(udev);
1da177e4
LT		 1851 if (udev->state == USB_STATE_SUSPENDED) {
1852 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1853 /* TRSMRCY = 10 msec */
1854 msleep(10);
f3f3253d 1855 status = finish_device_resume(udev);
1da177e4 1856 }
9ad3d6cc 1857 usb_unlock_device(udev);
f3f3253d 1858#endif
1da177e4
LT		 1859 return status;
1860}
1861
db690874 1862static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1863{
1864 struct usb_hub *hub = usb_get_intfdata (intf);
1865 struct usb_device *hdev = hub->hdev;
1866 unsigned port1;
1da177e4 1867
c9f89fa4 1868 /* fail if children aren't already suspended */
1da177e4
LT		 1869 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1870 struct usb_device *udev;
1871
1872 udev = hdev->children [port1-1];
f3f3253d
DB		 1873 if (udev && (udev->dev.power.power_state.event
1874 == PM_EVENT_ON
1875#ifdef CONFIG_USB_SUSPEND
1876 || udev->state != USB_STATE_SUSPENDED
1877#endif
1878 )) {
c9f89fa4
DB		 1879 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1880 return -EBUSY;
1881 }
1da177e4
LT		 1882 }
1883
f3f3253d
DB		 1884 /* "global suspend" of the downstream HC-to-USB interface */
1885 if (!hdev->parent) {
1886 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1887 if (bus) {
1888 int status = hcd_bus_suspend (bus);
f3f3253d
DB		 1889
1890 if (status != 0) {
1891 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1892 status);
1893 return status;
1894 }
1895 } else
1896 return -EOPNOTSUPP;
1897 }
1898
c9f89fa4
DB		 1899 /* stop khubd and related activity */
1900 hub_quiesce(hub);
1da177e4
LT		 1901 return 0;
1902}
1903
1904static int hub_resume(struct usb_interface *intf)
1905{
1906 struct usb_device *hdev = interface_to_usbdev(intf);
1907 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4
LT		 1908 int status;
1909
f3f3253d
DB		 1910 /* "global resume" of the downstream HC-to-USB interface */
1911 if (!hdev->parent) {
1912 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1913 if (bus) {
1914 status = hcd_bus_resume (bus);
f3f3253d
DB		 1915 if (status) {
1916 dev_dbg(&intf->dev, "'global' resume %d\n",
1917 status);
1918 return status;
1919 }
1920 } else
1921 return -EOPNOTSUPP;
1922 if (status == 0) {
1923 /* TRSMRCY = 10 msec */
1924 msleep(10);
1925 }
1926 }
1927
1928 hub_activate(hub);
1929
1930 /* REVISIT: this recursion probably shouldn't exist. Remove
1931 * this code sometime, after retesting with different root and
1932 * external hubs.
1933 */
1934#ifdef CONFIG_USB_SUSPEND
1935 {
1936 unsigned port1;
1937
1da177e4
LT		 1938 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1939 struct usb_device *udev;
1940 u16 portstat, portchange;
1941
1942 udev = hdev->children [port1-1];
1943 status = hub_port_status(hub, port1, &portstat, &portchange);
1944 if (status == 0) {
1945 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1946 clear_port_feature(hdev, port1,
1947 USB_PORT_FEAT_C_SUSPEND);
1948 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1949 }
1950
1951 /* let khubd handle disconnects etc */
1952 if (portchange)
1953 continue;
1954 }
1955
1956 if (!udev || status < 0)
1957 continue;
9ad3d6cc 1958 usb_lock_device(udev);
1da177e4
LT		 1959 if (portstat & USB_PORT_STAT_SUSPEND)
1960 status = hub_port_resume(hub, port1, udev);
1961 else {
f3f3253d 1962 status = finish_device_resume(udev);
1da177e4
LT		 1963 if (status < 0) {
1964 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1965 port1, status);
1966 hub_port_logical_disconnect(hub, port1);
1967 }
1968 }
9ad3d6cc 1969 usb_unlock_device(udev);
1da177e4 1970 }
f3f3253d
DB		 1971 }
1972#endif
1da177e4
LT		 1973 return 0;
1974}
1975
979d5199
DB		 1976void usb_suspend_root_hub(struct usb_device *hdev)
1977{
1978 struct usb_hub *hub = hdev_to_hub(hdev);
1979
1980 /* This also makes any led blinker stop retriggering. We're called
1981 * from irq, so the blinker might still be scheduled. Caller promises
1982 * that the root hub status URB will be canceled.
1983 */
1984 __hub_quiesce(hub);
1985 mark_quiesced(to_usb_interface(hub->intfdev));
1986}
1987
1da177e4
LT		 1988void usb_resume_root_hub(struct usb_device *hdev)
1989{
1990 struct usb_hub *hub = hdev_to_hub(hdev);
1991
1992 hub->resume_root_hub = 1;
1993 kick_khubd(hub);
1994}
1995
1da177e4
LT		 1996
1997/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1998 *
1999 * Between connect detection and reset signaling there must be a delay
2000 * of 100ms at least for debounce and power-settling. The corresponding
2001 * timer shall restart whenever the downstream port detects a disconnect.
2002 *
2003 * Apparently there are some bluetooth and irda-dongles and a number of
2004 * low-speed devices for which this debounce period may last over a second.
2005 * Not covered by the spec - but easy to deal with.
2006 *
2007 * This implementation uses a 1500ms total debounce timeout; if the
2008 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2009 * every 25ms for transient disconnects. When the port status has been
2010 * unchanged for 100ms it returns the port status.
2011 */
2012
2013#define HUB_DEBOUNCE_TIMEOUT 1500
2014#define HUB_DEBOUNCE_STEP 25
2015#define HUB_DEBOUNCE_STABLE 100
2016
2017static int hub_port_debounce(struct usb_hub *hub, int port1)
2018{
2019 int ret;
2020 int total_time, stable_time = 0;
2021 u16 portchange, portstatus;
2022 unsigned connection = 0xffff;
2023
2024 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2025 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2026 if (ret < 0)
2027 return ret;
2028
2029 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2030 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2031 stable_time += HUB_DEBOUNCE_STEP;
2032 if (stable_time >= HUB_DEBOUNCE_STABLE)
2033 break;
2034 } else {
2035 stable_time = 0;
2036 connection = portstatus & USB_PORT_STAT_CONNECTION;
2037 }
2038
2039 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2040 clear_port_feature(hub->hdev, port1,
2041 USB_PORT_FEAT_C_CONNECTION);
2042 }
2043
2044 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2045 break;
2046 msleep(HUB_DEBOUNCE_STEP);
2047 }
2048
2049 dev_dbg (hub->intfdev,
2050 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2051 port1, total_time, stable_time, portstatus);
2052
2053 if (stable_time < HUB_DEBOUNCE_STABLE)
2054 return -ETIMEDOUT;
2055 return portstatus;
2056}
2057
2058static void ep0_reinit(struct usb_device *udev)
2059{
2060 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2061 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2062 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2063}
2064
2065#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2066#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2067
2068static int hub_set_address(struct usb_device *udev)
2069{
2070 int retval;
2071
2072 if (udev->devnum == 0)
2073 return -EINVAL;
2074 if (udev->state == USB_STATE_ADDRESS)
2075 return 0;
2076 if (udev->state != USB_STATE_DEFAULT)
2077 return -EINVAL;
2078 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2079 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2080 NULL, 0, USB_CTRL_SET_TIMEOUT);
2081 if (retval == 0) {
2082 usb_set_device_state(udev, USB_STATE_ADDRESS);
2083 ep0_reinit(udev);
2084 }
2085 return retval;
2086}
2087
2088/* Reset device, (re)assign address, get device descriptor.
2089 * Device connection must be stable, no more debouncing needed.
2090 * Returns device in USB_STATE_ADDRESS, except on error.
2091 *
2092 * If this is called for an already-existing device (as part of
2093 * usb_reset_device), the caller must own the device lock. For a
2094 * newly detected device that is not accessible through any global
2095 * pointers, it's not necessary to lock the device.
2096 */
2097static int
2098hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2099 int retry_counter)
2100{
2101 static DECLARE_MUTEX(usb_address0_sem);
2102
2103 struct usb_device *hdev = hub->hdev;
2104 int i, j, retval;
2105 unsigned delay = HUB_SHORT_RESET_TIME;
2106 enum usb_device_speed oldspeed = udev->speed;
2107
2108 /* root hub ports have a slightly longer reset period
2109 * (from USB 2.0 spec, section 7.1.7.5)
2110 */
2111 if (!hdev->parent) {
2112 delay = HUB_ROOT_RESET_TIME;
2113 if (port1 == hdev->bus->otg_port)
2114 hdev->bus->b_hnp_enable = 0;
2115 }
2116
2117 /* Some low speed devices have problems with the quick delay, so */
2118 /* be a bit pessimistic with those devices. RHbug #23670 */
2119 if (oldspeed == USB_SPEED_LOW)
2120 delay = HUB_LONG_RESET_TIME;
2121
2122 down(&usb_address0_sem);
2123
2124 /* Reset the device; full speed may morph to high speed */
2125 retval = hub_port_reset(hub, port1, udev, delay);
2126 if (retval < 0) /* error or disconnect */
2127 goto fail;
2128 /* success, speed is known */
2129 retval = -ENODEV;
2130
2131 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2132 dev_dbg(&udev->dev, "device reset changed speed!\n");
2133 goto fail;
2134 }
2135 oldspeed = udev->speed;
2136
2137 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2138 * it's fixed size except for full speed devices.
2139 */
2140 switch (udev->speed) {
2141 case USB_SPEED_HIGH: /* fixed at 64 */
2142 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2143 break;
2144 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2145 /* to determine the ep0 maxpacket size, try to read
2146 * the device descriptor to get bMaxPacketSize0 and
2147 * then correct our initial guess.
2148 */
2149 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2150 break;
2151 case USB_SPEED_LOW: /* fixed at 8 */
2152 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2153 break;
2154 default:
2155 goto fail;
2156 }
2157
2158 dev_info (&udev->dev,
2159 "%s %s speed USB device using %s and address %d\n",
2160 (udev->config) ? "reset" : "new",
2161 ({ char *speed; switch (udev->speed) {
2162 case USB_SPEED_LOW: speed = "low"; break;
2163 case USB_SPEED_FULL: speed = "full"; break;
2164 case USB_SPEED_HIGH: speed = "high"; break;
2165 default: speed = "?"; break;
2166 }; speed;}),
2167 udev->bus->controller->driver->name,
2168 udev->devnum);
2169
2170 /* Set up TT records, if needed */
2171 if (hdev->tt) {
2172 udev->tt = hdev->tt;
2173 udev->ttport = hdev->ttport;
2174 } else if (udev->speed != USB_SPEED_HIGH
2175 && hdev->speed == USB_SPEED_HIGH) {
2176 udev->tt = &hub->tt;
2177 udev->ttport = port1;
2178 }
2179
2180 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2181 * Because device hardware and firmware is sometimes buggy in
2182 * this area, and this is how Linux has done it for ages.
2183 * Change it cautiously.
2184 *
2185 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2186 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2187 * so it may help with some non-standards-compliant devices.
2188 * Otherwise we start with SET_ADDRESS and then try to read the
2189 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2190 * value.
2191 */
2192 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2193 if (USE_NEW_SCHEME(retry_counter)) {
2194 struct usb_device_descriptor *buf;
2195 int r = 0;
2196
2197#define GET_DESCRIPTOR_BUFSIZE 64
2198 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2199 if (!buf) {
2200 retval = -ENOMEM;
2201 continue;
2202 }
2203
2204 /* Use a short timeout the first time through,
2205 * so that recalcitrant full-speed devices with
2206 * 8- or 16-byte ep0-maxpackets won't slow things
2207 * down tremendously by NAKing the unexpectedly
2208 * early status stage. Also, retry on all errors;
2209 * some devices are flakey.
2210 */
2211 for (j = 0; j < 3; ++j) {
2212 buf->bMaxPacketSize0 = 0;
2213 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2214 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2215 USB_DT_DEVICE << 8, 0,
2216 buf, GET_DESCRIPTOR_BUFSIZE,
2217 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2218 switch (buf->bMaxPacketSize0) {
2219 case 8: case 16: case 32: case 64:
2220 if (buf->bDescriptorType ==
2221 USB_DT_DEVICE) {
2222 r = 0;
2223 break;
2224 }
2225 /* FALL THROUGH */
2226 default:
2227 if (r == 0)
2228 r = -EPROTO;
2229 break;
2230 }
2231 if (r == 0)
2232 break;
2233 }
2234 udev->descriptor.bMaxPacketSize0 =
2235 buf->bMaxPacketSize0;
2236 kfree(buf);
2237
2238 retval = hub_port_reset(hub, port1, udev, delay);
2239 if (retval < 0) /* error or disconnect */
2240 goto fail;
2241 if (oldspeed != udev->speed) {
2242 dev_dbg(&udev->dev,
2243 "device reset changed speed!\n");
2244 retval = -ENODEV;
2245 goto fail;
2246 }
2247 if (r) {
2248 dev_err(&udev->dev, "device descriptor "
2249 "read/%s, error %d\n",
2250 "64", r);
2251 retval = -EMSGSIZE;
2252 continue;
2253 }
2254#undef GET_DESCRIPTOR_BUFSIZE
2255 }
2256
2257 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2258 retval = hub_set_address(udev);
2259 if (retval >= 0)
2260 break;
2261 msleep(200);
2262 }
2263 if (retval < 0) {
2264 dev_err(&udev->dev,
2265 "device not accepting address %d, error %d\n",
2266 udev->devnum, retval);
2267 goto fail;
2268 }
2269
2270 /* cope with hardware quirkiness:
2271 * - let SET_ADDRESS settle, some device hardware wants it
2272 * - read ep0 maxpacket even for high and low speed,
2273 */
2274 msleep(10);
2275 if (USE_NEW_SCHEME(retry_counter))
2276 break;
2277
2278 retval = usb_get_device_descriptor(udev, 8);
2279 if (retval < 8) {
2280 dev_err(&udev->dev, "device descriptor "
2281 "read/%s, error %d\n",
2282 "8", retval);
2283 if (retval >= 0)
2284 retval = -EMSGSIZE;
2285 } else {
2286 retval = 0;
2287 break;
2288 }
2289 }
2290 if (retval)
2291 goto fail;
2292
2293 i = udev->descriptor.bMaxPacketSize0;
2294 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2295 if (udev->speed != USB_SPEED_FULL ||
2296 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2297 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2298 retval = -EMSGSIZE;
2299 goto fail;
2300 }
2301 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2302 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2303 ep0_reinit(udev);
2304 }
2305
2306 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2307 if (retval < (signed)sizeof(udev->descriptor)) {
2308 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2309 "all", retval);
2310 if (retval >= 0)
2311 retval = -ENOMSG;
2312 goto fail;
2313 }
2314
2315 retval = 0;
2316
2317fail:
2318 if (retval)
2319 hub_port_disable(hub, port1, 0);
2320 up(&usb_address0_sem);
2321 return retval;
2322}
2323
2324static void
2325check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2326{
2327 struct usb_qualifier_descriptor *qual;
2328 int status;
2329
2330 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2331 if (qual == NULL)
2332 return;
2333
2334 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2335 qual, sizeof *qual);
2336 if (status == sizeof *qual) {
2337 dev_info(&udev->dev, "not running at top speed; "
2338 "connect to a high speed hub\n");
2339 /* hub LEDs are probably harder to miss than syslog */
2340 if (hub->has_indicators) {
2341 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2342 schedule_work (&hub->leds);
2343 }
2344 }
1bc3c9e1 2345 kfree(qual);
1da177e4
LT		 2346}
2347
2348static unsigned
2349hub_power_remaining (struct usb_hub *hub)
2350{
2351 struct usb_device *hdev = hub->hdev;
2352 int remaining;
2353 unsigned i;
2354
2355 remaining = hub->power_budget;
2356 if (!remaining) /* self-powered */
2357 return 0;
2358
2359 for (i = 0; i < hdev->maxchild; i++) {
2360 struct usb_device *udev = hdev->children[i];
2361 int delta, ceiling;
2362
2363 if (!udev)
2364 continue;
2365
2366 /* 100mA per-port ceiling, or 8mA for OTG ports */
2367 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2368 ceiling = 50;
2369 else
2370 ceiling = 4;
2371
2372 if (udev->actconfig)
2373 delta = udev->actconfig->desc.bMaxPower;
2374 else
2375 delta = ceiling;
2376 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2377 if (delta > ceiling)
2378 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2379 2 * (delta - ceiling), 2 * ceiling);
2380 remaining -= delta;
2381 }
2382 if (remaining < 0) {
2383 dev_warn(hub->intfdev,
2384 "%dmA over power budget!\n",
2385 -2 * remaining);
2386 remaining = 0;
2387 }
2388 return remaining;
2389}
2390
2391/* Handle physical or logical connection change events.
2392 * This routine is called when:
2393 * a port connection-change occurs;
2394 * a port enable-change occurs (often caused by EMI);
2395 * usb_reset_device() encounters changed descriptors (as from
2396 * a firmware download)
2397 * caller already locked the hub
2398 */
2399static void hub_port_connect_change(struct usb_hub *hub, int port1,
2400 u16 portstatus, u16 portchange)
2401{
2402 struct usb_device *hdev = hub->hdev;
2403 struct device *hub_dev = hub->intfdev;
74ad9bd2 2404 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2405 int status, i;
2406
2407 dev_dbg (hub_dev,
2408 "port %d, status %04x, change %04x, %s\n",
2409 port1, portstatus, portchange, portspeed (portstatus));
2410
2411 if (hub->has_indicators) {
2412 set_port_led(hub, port1, HUB_LED_AUTO);
2413 hub->indicator[port1-1] = INDICATOR_AUTO;
2414 }
2415
2416 /* Disconnect any existing devices under this port */
2417 if (hdev->children[port1-1])
2418 usb_disconnect(&hdev->children[port1-1]);
2419 clear_bit(port1, hub->change_bits);
2420
2421#ifdef CONFIG_USB_OTG
2422 /* during HNP, don't repeat the debounce */
2423 if (hdev->bus->is_b_host)
2424 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2425#endif
2426
2427 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2428 status = hub_port_debounce(hub, port1);
2429 if (status < 0) {
2430 dev_err (hub_dev,
2431 "connect-debounce failed, port %d disabled\n",
2432 port1);
2433 goto done;
2434 }
2435 portstatus = status;
2436 }
2437
2438 /* Return now if nothing is connected */
2439 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2440
2441 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2442 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2443 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2444 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2445
2446 if (portstatus & USB_PORT_STAT_ENABLE)
2447 goto done;
2448 return;
2449 }
2450
2451#ifdef CONFIG_USB_SUSPEND
2452 /* If something is connected, but the port is suspended, wake it up. */
2453 if (portstatus & USB_PORT_STAT_SUSPEND) {
2454 status = hub_port_resume(hub, port1, NULL);
2455 if (status < 0) {
2456 dev_dbg(hub_dev,
2457 "can't clear suspend on port %d; %d\n",
2458 port1, status);
2459 goto done;
2460 }
2461 }
2462#endif
2463
2464 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2465 struct usb_device *udev;
2466
2467 /* reallocate for each attempt, since references
2468 * to the previous one can escape in various ways
2469 */
2470 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2471 if (!udev) {
2472 dev_err (hub_dev,
2473 "couldn't allocate port %d usb_device\n",
2474 port1);
2475 goto done;
2476 }
2477
2478 usb_set_device_state(udev, USB_STATE_POWERED);
2479 udev->speed = USB_SPEED_UNKNOWN;
2480
2481 /* set the address */
2482 choose_address(udev);
2483 if (udev->devnum <= 0) {
2484 status = -ENOTCONN; /* Don't retry */
2485 goto loop;
2486 }
2487
2488 /* reset and get descriptor */
2489 status = hub_port_init(hub, udev, port1, i);
2490 if (status < 0)
2491 goto loop;
2492
2493 /* consecutive bus-powered hubs aren't reliable; they can
2494 * violate the voltage drop budget. if the new child has
2495 * a "powered" LED, users should notice we didn't enable it
2496 * (without reading syslog), even without per-port LEDs
2497 * on the parent.
2498 */
2499 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2500 && hub->power_budget) {
2501 u16 devstat;
2502
2503 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2504 &devstat);
2505 if (status < 0) {
2506 dev_dbg(&udev->dev, "get status %d ?\n", status);
2507 goto loop_disable;
2508 }
2509 cpu_to_le16s(&devstat);
2510 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2511 dev_err(&udev->dev,
2512 "can't connect bus-powered hub "
2513 "to this port\n");
2514 if (hub->has_indicators) {
2515 hub->indicator[port1-1] =
2516 INDICATOR_AMBER_BLINK;
2517 schedule_work (&hub->leds);
2518 }
2519 status = -ENOTCONN; /* Don't retry */
2520 goto loop_disable;
2521 }
2522 }
2523
2524 /* check for devices running slower than they could */
2525 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2526 && udev->speed == USB_SPEED_FULL
2527 && highspeed_hubs != 0)
2528 check_highspeed (hub, udev, port1);
2529
2530 /* Store the parent's children[] pointer. At this point
2531 * udev becomes globally accessible, although presumably
2532 * no one will look at it until hdev is unlocked.
2533 */
1da177e4
LT		 2534 status = 0;
2535
2536 /* We mustn't add new devices if the parent hub has
2537 * been disconnected; we would race with the
2538 * recursively_mark_NOTATTACHED() routine.
2539 */
2540 spin_lock_irq(&device_state_lock);
2541 if (hdev->state == USB_STATE_NOTATTACHED)
2542 status = -ENOTCONN;
2543 else
2544 hdev->children[port1-1] = udev;
2545 spin_unlock_irq(&device_state_lock);
2546
2547 /* Run it through the hoops (find a driver, etc) */
2548 if (!status) {
2549 status = usb_new_device(udev);
2550 if (status) {
2551 spin_lock_irq(&device_state_lock);
2552 hdev->children[port1-1] = NULL;
2553 spin_unlock_irq(&device_state_lock);
2554 }
2555 }
2556
1da177e4
LT		 2557 if (status)
2558 goto loop_disable;
2559
2560 status = hub_power_remaining(hub);
2561 if (status)
2562 dev_dbg(hub_dev,
2563 "%dmA power budget left\n",
2564 2 * status);
2565
2566 return;
2567
2568loop_disable:
2569 hub_port_disable(hub, port1, 1);
2570loop:
2571 ep0_reinit(udev);
2572 release_address(udev);
2573 usb_put_dev(udev);
2574 if (status == -ENOTCONN)
2575 break;
2576 }
2577
2578done:
2579 hub_port_disable(hub, port1, 1);
2580}
2581
2582static void hub_events(void)
2583{
2584 struct list_head *tmp;
2585 struct usb_device *hdev;
2586 struct usb_interface *intf;
2587 struct usb_hub *hub;
2588 struct device *hub_dev;
2589 u16 hubstatus;
2590 u16 hubchange;
2591 u16 portstatus;
2592 u16 portchange;
2593 int i, ret;
2594 int connect_change;
2595
2596 /*
2597 * We restart the list every time to avoid a deadlock with
2598 * deleting hubs downstream from this one. This should be
2599 * safe since we delete the hub from the event list.
2600 * Not the most efficient, but avoids deadlocks.
2601 */
2602 while (1) {
2603
2604 /* Grab the first entry at the beginning of the list */
2605 spin_lock_irq(&hub_event_lock);
2606 if (list_empty(&hub_event_list)) {
2607 spin_unlock_irq(&hub_event_lock);
2608 break;
2609 }
2610
2611 tmp = hub_event_list.next;
2612 list_del_init(tmp);
2613
2614 hub = list_entry(tmp, struct usb_hub, event_list);
2615 hdev = hub->hdev;
2616 intf = to_usb_interface(hub->intfdev);
2617 hub_dev = &intf->dev;
2618
979d5199
DB		 2619 i = hub->resume_root_hub;
2620
2621 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
1da177e4
LT		 2622 hdev->state, hub->descriptor
2623 ? hub->descriptor->bNbrPorts
2624 : 0,
2625 /* NOTE: expects max 15 ports... */
2626 (u16) hub->change_bits[0],
979d5199
DB		 2627 (u16) hub->event_bits[0],
2628 i ? ", resume root" : "");
1da177e4
LT		 2629
2630 usb_get_intf(intf);
1da177e4
LT		 2631 spin_unlock_irq(&hub_event_lock);
2632
979d5199
DB		 2633 /* Is this is a root hub wanting to reactivate the downstream
2634 * ports? If so, be sure the interface resumes even if its
2635 * stub "device" node was never suspended.
2636 */
2637 if (i) {
979d5199
DB		 2638 dpm_runtime_resume(&hdev->dev);
2639 dpm_runtime_resume(&intf->dev);
2640 }
1da177e4
LT		 2641
2642 /* Lock the device, then check to see if we were
2643 * disconnected while waiting for the lock to succeed. */
2644 if (locktree(hdev) < 0) {
2645 usb_put_intf(intf);
2646 continue;
2647 }
2648 if (hub != usb_get_intfdata(intf))
2649 goto loop;
2650
2651 /* If the hub has died, clean up after it */
2652 if (hdev->state == USB_STATE_NOTATTACHED) {
7d069b7d 2653 hub_pre_reset(hub, 0);
1da177e4
LT		 2654 goto loop;
2655 }
2656
2657 /* If this is an inactive or suspended hub, do nothing */
2658 if (hub->quiescing)
2659 goto loop;
2660
2661 if (hub->error) {
2662 dev_dbg (hub_dev, "resetting for error %d\n",
2663 hub->error);
2664
2665 ret = usb_reset_device(hdev);
2666 if (ret) {
2667 dev_dbg (hub_dev,
2668 "error resetting hub: %d\n", ret);
2669 goto loop;
2670 }
2671
2672 hub->nerrors = 0;
2673 hub->error = 0;
2674 }
2675
2676 /* deal with port status changes */
2677 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2678 if (test_bit(i, hub->busy_bits))
2679 continue;
2680 connect_change = test_bit(i, hub->change_bits);
2681 if (!test_and_clear_bit(i, hub->event_bits) &&
2682 !connect_change && !hub->activating)
2683 continue;
2684
2685 ret = hub_port_status(hub, i,
2686 &portstatus, &portchange);
2687 if (ret < 0)
2688 continue;
2689
2690 if (hub->activating && !hdev->children[i-1] &&
2691 (portstatus &
2692 USB_PORT_STAT_CONNECTION))
2693 connect_change = 1;
2694
2695 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2696 clear_port_feature(hdev, i,
2697 USB_PORT_FEAT_C_CONNECTION);
2698 connect_change = 1;
2699 }
2700
2701 if (portchange & USB_PORT_STAT_C_ENABLE) {
2702 if (!connect_change)
2703 dev_dbg (hub_dev,
2704 "port %d enable change, "
2705 "status %08x\n",
2706 i, portstatus);
2707 clear_port_feature(hdev, i,
2708 USB_PORT_FEAT_C_ENABLE);
2709
2710 /*
2711 * EM interference sometimes causes badly
2712 * shielded USB devices to be shutdown by
2713 * the hub, this hack enables them again.
2714 * Works at least with mouse driver.
2715 */
2716 if (!(portstatus & USB_PORT_STAT_ENABLE)
2717 && !connect_change
2718 && hdev->children[i-1]) {
2719 dev_err (hub_dev,
2720 "port %i "
2721 "disabled by hub (EMI?), "
2722 "re-enabling...\n",
2723 i);
2724 connect_change = 1;
2725 }
2726 }
2727
2728 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2729 clear_port_feature(hdev, i,
2730 USB_PORT_FEAT_C_SUSPEND);
2731 if (hdev->children[i-1]) {
2732 ret = remote_wakeup(hdev->
2733 children[i-1]);
2734 if (ret < 0)
2735 connect_change = 1;
2736 } else {
2737 ret = -ENODEV;
2738 hub_port_disable(hub, i, 1);
2739 }
2740 dev_dbg (hub_dev,
2741 "resume on port %d, status %d\n",
2742 i, ret);
2743 }
2744
2745 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2746 dev_err (hub_dev,
2747 "over-current change on port %d\n",
2748 i);
2749 clear_port_feature(hdev, i,
2750 USB_PORT_FEAT_C_OVER_CURRENT);
2751 hub_power_on(hub);
2752 }
2753
2754 if (portchange & USB_PORT_STAT_C_RESET) {
2755 dev_dbg (hub_dev,
2756 "reset change on port %d\n",
2757 i);
2758 clear_port_feature(hdev, i,
2759 USB_PORT_FEAT_C_RESET);
2760 }
2761
2762 if (connect_change)
2763 hub_port_connect_change(hub, i,
2764 portstatus, portchange);
2765 } /* end for i */
2766
2767 /* deal with hub status changes */
2768 if (test_and_clear_bit(0, hub->event_bits) == 0)
2769 ; /* do nothing */
2770 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2771 dev_err (hub_dev, "get_hub_status failed\n");
2772 else {
2773 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2774 dev_dbg (hub_dev, "power change\n");
2775 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2776 }
2777 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2778 dev_dbg (hub_dev, "overcurrent change\n");
2779 msleep(500); /* Cool down */
2780 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2781 hub_power_on(hub);
2782 }
2783 }
2784
2785 hub->activating = 0;
2786
d5926ae7
AS		 2787 /* If this is a root hub, tell the HCD it's okay to
2788 * re-enable port-change interrupts now. */
2789 if (!hdev->parent)
2790 usb_enable_root_hub_irq(hdev->bus);
2791
1da177e4
LT		 2792loop:
2793 usb_unlock_device(hdev);
2794 usb_put_intf(intf);
2795
2796 } /* end while (1) */
2797}
2798
2799static int hub_thread(void *__unused)
2800{
1da177e4
LT		 2801 do {
2802 hub_events();
9c8d6178 2803 wait_event_interruptible(khubd_wait,
2804 !list_empty(&hub_event_list) ||
2805 kthread_should_stop());
3e1d1d28 2806 try_to_freeze();
9c8d6178 2807 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2808
9c8d6178 2809 pr_debug("%s: khubd exiting\n", usbcore_name);
2810 return 0;
1da177e4
LT		 2811}
2812
2813static struct usb_device_id hub_id_table [] = {
2814 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2815 .bDeviceClass = USB_CLASS_HUB},
2816 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2817 .bInterfaceClass = USB_CLASS_HUB},
2818 { } /* Terminating entry */
2819};
2820
2821MODULE_DEVICE_TABLE (usb, hub_id_table);
2822
2823static struct usb_driver hub_driver = {
1da177e4
LT		 2824 .name = "hub",
2825 .probe = hub_probe,
2826 .disconnect = hub_disconnect,
2827 .suspend = hub_suspend,
2828 .resume = hub_resume,
2829 .ioctl = hub_ioctl,
2830 .id_table = hub_id_table,
2831};
2832
2833int usb_hub_init(void)
2834{
1da177e4
LT		 2835 if (usb_register(&hub_driver) < 0) {
2836 printk(KERN_ERR "%s: can't register hub driver\n",
2837 usbcore_name);
2838 return -1;
2839 }
2840
9c8d6178 2841 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2842 if (!IS_ERR(khubd_task))
1da177e4 2843 return 0;
1da177e4
LT		 2844
2845 /* Fall through if kernel_thread failed */
2846 usb_deregister(&hub_driver);
2847 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2848
2849 return -1;
2850}
2851
2852void usb_hub_cleanup(void)
2853{
9c8d6178 2854 kthread_stop(khubd_task);
1da177e4
LT		 2855
2856 /*
2857 * Hub resources are freed for us by usb_deregister. It calls
2858 * usb_driver_purge on every device which in turn calls that
2859 * devices disconnect function if it is using this driver.
2860 * The hub_disconnect function takes care of releasing the
2861 * individual hub resources. -greg
2862 */
2863 usb_deregister(&hub_driver);
2864} /* usb_hub_cleanup() */
2865
1da177e4
LT		 2866static int config_descriptors_changed(struct usb_device *udev)
2867{
2868 unsigned index;
2869 unsigned len = 0;
2870 struct usb_config_descriptor *buf;
2871
2872 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2873 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2874 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2875 }
2876 buf = kmalloc (len, SLAB_KERNEL);
2877 if (buf == NULL) {
2878 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2879 /* assume the worst */
2880 return 1;
2881 }
2882 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2883 int length;
2884 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2885
2886 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2887 old_length);
2888 if (length < old_length) {
2889 dev_dbg(&udev->dev, "config index %d, error %d\n",
2890 index, length);
2891 break;
2892 }
2893 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2894 != 0) {
2895 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2896 index, buf->bConfigurationValue);
2897 break;
2898 }
2899 }
2900 kfree(buf);
2901 return index != udev->descriptor.bNumConfigurations;
2902}
2903
2904/**
2905 * usb_reset_device - perform a USB port reset to reinitialize a device
2906 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2907 *
2908 * WARNING - don't reset any device unless drivers for all of its
2909 * interfaces are expecting that reset! Maybe some driver->reset()
2910 * method should eventually help ensure sufficient cooperation.
2911 *
2912 * Do a port reset, reassign the device's address, and establish its
2913 * former operating configuration. If the reset fails, or the device's
2914 * descriptors change from their values before the reset, or the original
2915 * configuration and altsettings cannot be restored, a flag will be set
2916 * telling khubd to pretend the device has been disconnected and then
2917 * re-connected. All drivers will be unbound, and the device will be
2918 * re-enumerated and probed all over again.
2919 *
2920 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2921 * flagged for logical disconnection, or some other negative error code
2922 * if the reset wasn't even attempted.
2923 *
2924 * The caller must own the device lock. For example, it's safe to use
2925 * this from a driver probe() routine after downloading new firmware.
2926 * For calls that might not occur during probe(), drivers should lock
2927 * the device using usb_lock_device_for_reset().
2928 */
2929int usb_reset_device(struct usb_device *udev)
2930{
2931 struct usb_device *parent_hdev = udev->parent;
2932 struct usb_hub *parent_hub;
2933 struct usb_device_descriptor descriptor = udev->descriptor;
2934 struct usb_hub *hub = NULL;
2935 int i, ret = 0, port1 = -1;
2936
2937 if (udev->state == USB_STATE_NOTATTACHED ||
2938 udev->state == USB_STATE_SUSPENDED) {
2939 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2940 udev->state);
2941 return -EINVAL;
2942 }
2943
2944 if (!parent_hdev) {
2945 /* this requires hcd-specific logic; see OHCI hc_restart() */
2946 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2947 return -EISDIR;
2948 }
2949
2950 for (i = 0; i < parent_hdev->maxchild; i++)
2951 if (parent_hdev->children[i] == udev) {
2952 port1 = i + 1;
2953 break;
2954 }
2955
2956 if (port1 < 0) {
2957 /* If this ever happens, it's very bad */
2958 dev_err(&udev->dev, "Can't locate device's port!\n");
2959 return -ENOENT;
2960 }
2961 parent_hub = hdev_to_hub(parent_hdev);
2962
2963 /* If we're resetting an active hub, take some special actions */
2964 if (udev->actconfig &&
2965 udev->actconfig->interface[0]->dev.driver ==
2966 &hub_driver.driver &&
2967 (hub = hdev_to_hub(udev)) != NULL) {
7d069b7d 2968 hub_pre_reset(hub, 0);
1da177e4
LT		 2969 }
2970
2971 set_bit(port1, parent_hub->busy_bits);
2972 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2973
2974 /* ep0 maxpacket size may change; let the HCD know about it.
2975 * Other endpoints will be handled by re-enumeration. */
2976 ep0_reinit(udev);
2977 ret = hub_port_init(parent_hub, udev, port1, i);
2978 if (ret >= 0)
2979 break;
2980 }
2981 clear_bit(port1, parent_hub->busy_bits);
2982 if (ret < 0)
2983 goto re_enumerate;
2984
2985 /* Device might have changed firmware (DFU or similar) */
2986 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2987 || config_descriptors_changed (udev)) {
2988 dev_info(&udev->dev, "device firmware changed\n");
2989 udev->descriptor = descriptor; /* for disconnect() calls */
2990 goto re_enumerate;
2991 }
2992
2993 if (!udev->actconfig)
2994 goto done;
2995
2996 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2997 USB_REQ_SET_CONFIGURATION, 0,
2998 udev->actconfig->desc.bConfigurationValue, 0,
2999 NULL, 0, USB_CTRL_SET_TIMEOUT);
3000 if (ret < 0) {
3001 dev_err(&udev->dev,
3002 "can't restore configuration #%d (error=%d)\n",
3003 udev->actconfig->desc.bConfigurationValue, ret);
3004 goto re_enumerate;
3005 }
3006 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3007
3008 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3009 struct usb_interface *intf = udev->actconfig->interface[i];
3010 struct usb_interface_descriptor *desc;
3011
3012 /* set_interface resets host side toggle even
3013 * for altsetting zero. the interface may have no driver.
3014 */
3015 desc = &intf->cur_altsetting->desc;
3016 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3017 desc->bAlternateSetting);
3018 if (ret < 0) {
3019 dev_err(&udev->dev, "failed to restore interface %d "
3020 "altsetting %d (error=%d)\n",
3021 desc->bInterfaceNumber,
3022 desc->bAlternateSetting,
3023 ret);
3024 goto re_enumerate;
3025 }
3026 }
3027
3028done:
3029 if (hub)
3030 hub_post_reset(hub);
3031 return 0;
3032
3033re_enumerate:
3034 hub_port_logical_disconnect(parent_hub, port1);
3035 return -ENODEV;
3036}
Linux kernel - Deliverables
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