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USB: usblp: Use usb_endpoint_* functions.
[GitHub/mt8127/android_kernel_alcatel_ttab.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
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
19#include <linux/smp_lock.h>
20#include <linux/ioctl.h>
21#include <linux/usb.h>
22#include <linux/usbdevice_fs.h>
9c8d6178 23#include <linux/kthread.h>
4186ecf8 24#include <linux/mutex.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;
4489a571
AS		 434 u16 wHubCharacteristics =
435 le16_to_cpu(hub->descriptor->wHubCharacteristics);
436
437 /* Enable power on each port. Some hubs have reserved values
438 * of LPSM (> 2) in their descriptors, even though they are
439 * USB 2.0 hubs. Some hubs do not implement port-power switching
440 * but only emulate it. In all cases, the ports won't work
441 * unless we send these messages to the hub.
442 */
443 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 444 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 445 else
446 dev_dbg(hub->intfdev, "trying to enable port power on "
447 "non-switchable hub\n");
448 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
449 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 450
b789696a
DB		 451 /* Wait at least 100 msec for power to become stable */
452 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 453}
454
979d5199 455static inline void __hub_quiesce(struct usb_hub *hub)
1da177e4 456{
979d5199 457 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 458 hub->quiescing = 1;
c9f89fa4 459 hub->activating = 0;
979d5199
DB		 460 hub->resume_root_hub = 0;
461}
462
463static void hub_quiesce(struct usb_hub *hub)
464{
465 /* (blocking) stop khubd and related activity */
466 __hub_quiesce(hub);
1da177e4
LT		 467 usb_kill_urb(hub->urb);
468 if (hub->has_indicators)
469 cancel_delayed_work(&hub->leds);
470 if (hub->has_indicators || hub->tt.hub)
471 flush_scheduled_work();
472}
473
474static void hub_activate(struct usb_hub *hub)
475{
476 int status;
477
478 hub->quiescing = 0;
479 hub->activating = 1;
979d5199 480 hub->resume_root_hub = 0;
1da177e4
LT		 481 status = usb_submit_urb(hub->urb, GFP_NOIO);
482 if (status < 0)
483 dev_err(hub->intfdev, "activate --> %d\n", status);
484 if (hub->has_indicators && blinkenlights)
485 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
486
487 /* scan all ports ASAP */
488 kick_khubd(hub);
489}
490
491static int hub_hub_status(struct usb_hub *hub,
492 u16 *status, u16 *change)
493{
494 int ret;
495
496 ret = get_hub_status(hub->hdev, &hub->status->hub);
497 if (ret < 0)
498 dev_err (hub->intfdev,
499 "%s failed (err = %d)\n", __FUNCTION__, ret);
500 else {
501 *status = le16_to_cpu(hub->status->hub.wHubStatus);
502 *change = le16_to_cpu(hub->status->hub.wHubChange);
503 ret = 0;
504 }
505 return ret;
506}
507
8b28c752
AS		 508static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
509{
510 struct usb_device *hdev = hub->hdev;
511 int ret;
512
513 if (hdev->children[port1-1] && set_state) {
514 usb_set_device_state(hdev->children[port1-1],
515 USB_STATE_NOTATTACHED);
516 }
517 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
518 if (ret)
519 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
520 port1, ret);
521
522 return ret;
523}
524
7d069b7d
AS		 525
526/* caller has locked the hub device */
7de18d8b 527static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 528{
7de18d8b 529 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 530 struct usb_device *hdev = hub->hdev;
531 int port1;
532
533 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
534 if (hdev->children[port1 - 1]) {
535 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 536 if (hub->error == 0)
7d069b7d
AS		 537 hub_port_disable(hub, port1, 0);
538 }
539 }
540 hub_quiesce(hub);
541}
542
543/* caller has locked the hub device */
7de18d8b 544static void hub_post_reset(struct usb_interface *intf)
7d069b7d 545{
7de18d8b
AS		 546 struct usb_hub *hub = usb_get_intfdata(intf);
547
7d069b7d
AS		 548 hub_activate(hub);
549 hub_power_on(hub);
550}
551
552
1da177e4
LT		 553static int hub_configure(struct usb_hub *hub,
554 struct usb_endpoint_descriptor *endpoint)
555{
556 struct usb_device *hdev = hub->hdev;
557 struct device *hub_dev = hub->intfdev;
558 u16 hubstatus, hubchange;
74ad9bd2 559 u16 wHubCharacteristics;
1da177e4
LT		 560 unsigned int pipe;
561 int maxp, ret;
562 char *message;
563
564 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
565 &hub->buffer_dma);
566 if (!hub->buffer) {
567 message = "can't allocate hub irq buffer";
568 ret = -ENOMEM;
569 goto fail;
570 }
571
572 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
573 if (!hub->status) {
574 message = "can't kmalloc hub status buffer";
575 ret = -ENOMEM;
576 goto fail;
577 }
578
579 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
580 if (!hub->descriptor) {
581 message = "can't kmalloc hub descriptor";
582 ret = -ENOMEM;
583 goto fail;
584 }
585
586 /* Request the entire hub descriptor.
587 * hub->descriptor can handle USB_MAXCHILDREN ports,
588 * but the hub can/will return fewer bytes here.
589 */
590 ret = get_hub_descriptor(hdev, hub->descriptor,
591 sizeof(*hub->descriptor));
592 if (ret < 0) {
593 message = "can't read hub descriptor";
594 goto fail;
595 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
596 message = "hub has too many ports!";
597 ret = -ENODEV;
598 goto fail;
599 }
600
601 hdev->maxchild = hub->descriptor->bNbrPorts;
602 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
603 (hdev->maxchild == 1) ? "" : "s");
604
74ad9bd2 605 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 606
74ad9bd2 607 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 608 int i;
609 char portstr [USB_MAXCHILDREN + 1];
610
611 for (i = 0; i < hdev->maxchild; i++)
612 portstr[i] = hub->descriptor->DeviceRemovable
613 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
614 ? 'F' : 'R';
615 portstr[hdev->maxchild] = 0;
616 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
617 } else
618 dev_dbg(hub_dev, "standalone hub\n");
619
74ad9bd2 620 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 621 case 0x00:
622 dev_dbg(hub_dev, "ganged power switching\n");
623 break;
624 case 0x01:
625 dev_dbg(hub_dev, "individual port power switching\n");
626 break;
627 case 0x02:
628 case 0x03:
629 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
630 break;
631 }
632
74ad9bd2 633 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 634 case 0x00:
635 dev_dbg(hub_dev, "global over-current protection\n");
636 break;
637 case 0x08:
638 dev_dbg(hub_dev, "individual port over-current protection\n");
639 break;
640 case 0x10:
641 case 0x18:
642 dev_dbg(hub_dev, "no over-current protection\n");
643 break;
644 }
645
646 spin_lock_init (&hub->tt.lock);
647 INIT_LIST_HEAD (&hub->tt.clear_list);
648 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
649 switch (hdev->descriptor.bDeviceProtocol) {
650 case 0:
651 break;
652 case 1:
653 dev_dbg(hub_dev, "Single TT\n");
654 hub->tt.hub = hdev;
655 break;
656 case 2:
657 ret = usb_set_interface(hdev, 0, 1);
658 if (ret == 0) {
659 dev_dbg(hub_dev, "TT per port\n");
660 hub->tt.multi = 1;
661 } else
662 dev_err(hub_dev, "Using single TT (err %d)\n",
663 ret);
664 hub->tt.hub = hdev;
665 break;
666 default:
667 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
668 hdev->descriptor.bDeviceProtocol);
669 break;
670 }
671
e09711ae 672 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 673 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 674 case HUB_TTTT_8_BITS:
675 if (hdev->descriptor.bDeviceProtocol != 0) {
676 hub->tt.think_time = 666;
677 dev_dbg(hub_dev, "TT requires at most %d "
678 "FS bit times (%d ns)\n",
679 8, hub->tt.think_time);
680 }
1da177e4 681 break;
e09711ae
DB		 682 case HUB_TTTT_16_BITS:
683 hub->tt.think_time = 666 * 2;
684 dev_dbg(hub_dev, "TT requires at most %d "
685 "FS bit times (%d ns)\n",
686 16, hub->tt.think_time);
1da177e4 687 break;
e09711ae
DB		 688 case HUB_TTTT_24_BITS:
689 hub->tt.think_time = 666 * 3;
690 dev_dbg(hub_dev, "TT requires at most %d "
691 "FS bit times (%d ns)\n",
692 24, hub->tt.think_time);
1da177e4 693 break;
e09711ae
DB		 694 case HUB_TTTT_32_BITS:
695 hub->tt.think_time = 666 * 4;
696 dev_dbg(hub_dev, "TT requires at most %d "
697 "FS bit times (%d ns)\n",
698 32, hub->tt.think_time);
1da177e4
LT		 699 break;
700 }
701
702 /* probe() zeroes hub->indicator[] */
74ad9bd2 703 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 704 hub->has_indicators = 1;
705 dev_dbg(hub_dev, "Port indicators are supported\n");
706 }
707
708 dev_dbg(hub_dev, "power on to power good time: %dms\n",
709 hub->descriptor->bPwrOn2PwrGood * 2);
710
711 /* power budgeting mostly matters with bus-powered hubs,
712 * and battery-powered root hubs (may provide just 8 mA).
713 */
714 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 715 if (ret < 2) {
1da177e4
LT		 716 message = "can't get hub status";
717 goto fail;
718 }
7d35b929
AS		 719 le16_to_cpus(&hubstatus);
720 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 721 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
722 hub->mA_per_port = 500;
723 else {
724 hub->mA_per_port = hdev->bus_mA;
725 hub->limited_power = 1;
726 }
7d35b929 727 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 728 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
729 hub->descriptor->bHubContrCurrent);
55c52718
AS		 730 hub->limited_power = 1;
731 if (hdev->maxchild > 0) {
732 int remaining = hdev->bus_mA -
733 hub->descriptor->bHubContrCurrent;
734
735 if (remaining < hdev->maxchild * 100)
736 dev_warn(hub_dev,
737 "insufficient power available "
738 "to use all downstream ports\n");
739 hub->mA_per_port = 100; /* 7.2.1.1 */
740 }
741 } else { /* Self-powered external hub */
742 /* FIXME: What about battery-powered external hubs that
743 * provide less current per port? */
744 hub->mA_per_port = 500;
7d35b929 745 }
55c52718
AS		 746 if (hub->mA_per_port < 500)
747 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
748 hub->mA_per_port);
1da177e4
LT		 749
750 ret = hub_hub_status(hub, &hubstatus, &hubchange);
751 if (ret < 0) {
752 message = "can't get hub status";
753 goto fail;
754 }
755
756 /* local power status reports aren't always correct */
757 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
758 dev_dbg(hub_dev, "local power source is %s\n",
759 (hubstatus & HUB_STATUS_LOCAL_POWER)
760 ? "lost (inactive)" : "good");
761
74ad9bd2 762 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 763 dev_dbg(hub_dev, "%sover-current condition exists\n",
764 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
765
766 /* set up the interrupt endpoint */
767 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
768 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
769
770 if (maxp > sizeof(*hub->buffer))
771 maxp = sizeof(*hub->buffer);
772
773 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
774 if (!hub->urb) {
775 message = "couldn't allocate interrupt urb";
776 ret = -ENOMEM;
777 goto fail;
778 }
779
780 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
781 hub, endpoint->bInterval);
782 hub->urb->transfer_dma = hub->buffer_dma;
783 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
784
785 /* maybe cycle the hub leds */
786 if (hub->has_indicators && blinkenlights)
787 hub->indicator [0] = INDICATOR_CYCLE;
788
789 hub_power_on(hub);
790 hub_activate(hub);
791 return 0;
792
793fail:
794 dev_err (hub_dev, "config failed, %s (err %d)\n",
795 message, ret);
796 /* hub_disconnect() frees urb and descriptor */
797 return ret;
798}
799
800static unsigned highspeed_hubs;
801
802static void hub_disconnect(struct usb_interface *intf)
803{
804 struct usb_hub *hub = usb_get_intfdata (intf);
805 struct usb_device *hdev;
806
7de18d8b
AS		 807 /* Disconnect all children and quiesce the hub */
808 hub->error = 0;
809 hub_pre_reset(intf);
810
8b28c752 811 usb_set_intfdata (intf, NULL);
1da177e4
LT		 812 hdev = hub->hdev;
813
814 if (hdev->speed == USB_SPEED_HIGH)
815 highspeed_hubs--;
816
1da177e4
LT		 817 usb_free_urb(hub->urb);
818 hub->urb = NULL;
819
820 spin_lock_irq(&hub_event_lock);
821 list_del_init(&hub->event_list);
822 spin_unlock_irq(&hub_event_lock);
823
1bc3c9e1
JJ		 824 kfree(hub->descriptor);
825 hub->descriptor = NULL;
1da177e4 826
1bc3c9e1
JJ		 827 kfree(hub->status);
828 hub->status = NULL;
1da177e4
LT		 829
830 if (hub->buffer) {
831 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
832 hub->buffer_dma);
833 hub->buffer = NULL;
834 }
835
7d069b7d 836 kfree(hub);
1da177e4
LT		 837}
838
839static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
840{
841 struct usb_host_interface *desc;
842 struct usb_endpoint_descriptor *endpoint;
843 struct usb_device *hdev;
844 struct usb_hub *hub;
845
846 desc = intf->cur_altsetting;
847 hdev = interface_to_usbdev(intf);
848
89ccbdc9
DB		 849#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
850 if (hdev->parent) {
851 dev_warn(&intf->dev, "ignoring external hub\n");
852 return -ENODEV;
853 }
854#endif
855
1da177e4
LT		 856 /* Some hubs have a subclass of 1, which AFAICT according to the */
857 /* specs is not defined, but it works */
858 if ((desc->desc.bInterfaceSubClass != 0) &&
859 (desc->desc.bInterfaceSubClass != 1)) {
860descriptor_error:
861 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
862 return -EIO;
863 }
864
865 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
866 if (desc->desc.bNumEndpoints != 1)
867 goto descriptor_error;
868
869 endpoint = &desc->endpoint[0].desc;
870
871 /* Output endpoint? Curiouser and curiouser.. */
872 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
873 goto descriptor_error;
874
875 /* If it's not an interrupt endpoint, we'd better punt! */
876 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
877 != USB_ENDPOINT_XFER_INT)
878 goto descriptor_error;
879
880 /* We found a hub */
881 dev_info (&intf->dev, "USB hub found\n");
882
0a1ef3b5 883 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 884 if (!hub) {
885 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
886 return -ENOMEM;
887 }
888
1da177e4
LT		 889 INIT_LIST_HEAD(&hub->event_list);
890 hub->intfdev = &intf->dev;
891 hub->hdev = hdev;
892 INIT_WORK(&hub->leds, led_work, hub);
893
894 usb_set_intfdata (intf, hub);
895
896 if (hdev->speed == USB_SPEED_HIGH)
897 highspeed_hubs++;
898
899 if (hub_configure(hub, endpoint) >= 0)
900 return 0;
901
902 hub_disconnect (intf);
903 return -ENODEV;
904}
905
906static int
907hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
908{
909 struct usb_device *hdev = interface_to_usbdev (intf);
910
911 /* assert ifno == 0 (part of hub spec) */
912 switch (code) {
913 case USBDEVFS_HUB_PORTINFO: {
914 struct usbdevfs_hub_portinfo *info = user_data;
915 int i;
916
917 spin_lock_irq(&device_state_lock);
918 if (hdev->devnum <= 0)
919 info->nports = 0;
920 else {
921 info->nports = hdev->maxchild;
922 for (i = 0; i < info->nports; i++) {
923 if (hdev->children[i] == NULL)
924 info->port[i] = 0;
925 else
926 info->port[i] =
927 hdev->children[i]->devnum;
928 }
929 }
930 spin_unlock_irq(&device_state_lock);
931
932 return info->nports + 1;
933 }
934
935 default:
936 return -ENOSYS;
937 }
938}
939
1da177e4
LT		 940
941/* grab device/port lock, returning index of that port (zero based).
942 * protects the upstream link used by this device from concurrent
943 * tree operations like suspend, resume, reset, and disconnect, which
944 * apply to everything downstream of a given port.
945 */
946static int locktree(struct usb_device *udev)
947{
948 int t;
949 struct usb_device *hdev;
950
951 if (!udev)
952 return -ENODEV;
953
954 /* root hub is always the first lock in the series */
955 hdev = udev->parent;
956 if (!hdev) {
957 usb_lock_device(udev);
958 return 0;
959 }
960
961 /* on the path from root to us, lock everything from
962 * top down, dropping parent locks when not needed
963 */
964 t = locktree(hdev);
965 if (t < 0)
966 return t;
1da177e4 967
12c3da34
AS		 968 /* everything is fail-fast once disconnect
969 * processing starts
970 */
971 if (udev->state == USB_STATE_NOTATTACHED) {
972 usb_unlock_device(hdev);
973 return -ENODEV;
1da177e4 974 }
12c3da34
AS		 975
976 /* when everyone grabs locks top->bottom,
977 * non-overlapping work may be concurrent
978 */
979 usb_lock_device(udev);
1da177e4 980 usb_unlock_device(hdev);
12c3da34 981 return udev->portnum;
1da177e4
LT		 982}
983
984static void recursively_mark_NOTATTACHED(struct usb_device *udev)
985{
986 int i;
987
988 for (i = 0; i < udev->maxchild; ++i) {
989 if (udev->children[i])
990 recursively_mark_NOTATTACHED(udev->children[i]);
991 }
992 udev->state = USB_STATE_NOTATTACHED;
993}
994
995/**
996 * usb_set_device_state - change a device's current state (usbcore, hcds)
997 * @udev: pointer to device whose state should be changed
998 * @new_state: new state value to be stored
999 *
1000 * udev->state is _not_ fully protected by the device lock. Although
1001 * most transitions are made only while holding the lock, the state can
1002 * can change to USB_STATE_NOTATTACHED at almost any time. This
1003 * is so that devices can be marked as disconnected as soon as possible,
1004 * without having to wait for any semaphores to be released. As a result,
1005 * all changes to any device's state must be protected by the
1006 * device_state_lock spinlock.
1007 *
1008 * Once a device has been added to the device tree, all changes to its state
1009 * should be made using this routine. The state should _not_ be set directly.
1010 *
1011 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1012 * Otherwise udev->state is set to new_state, and if new_state is
1013 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1014 * to USB_STATE_NOTATTACHED.
1015 */
1016void usb_set_device_state(struct usb_device *udev,
1017 enum usb_device_state new_state)
1018{
1019 unsigned long flags;
1020
1021 spin_lock_irqsave(&device_state_lock, flags);
1022 if (udev->state == USB_STATE_NOTATTACHED)
1023 ; /* do nothing */
b94dc6b5 1024 else if (new_state != USB_STATE_NOTATTACHED) {
1da177e4 1025 udev->state = new_state;
fb669cc0
DB		 1026
1027 /* root hub wakeup capabilities are managed out-of-band
1028 * and may involve silicon errata ... ignore them here.
1029 */
1030 if (udev->parent) {
1031 if (new_state == USB_STATE_CONFIGURED)
1032 device_init_wakeup(&udev->dev,
1033 (udev->actconfig->desc.bmAttributes
1034 & USB_CONFIG_ATT_WAKEUP));
1035 else if (new_state != USB_STATE_SUSPENDED)
1036 device_init_wakeup(&udev->dev, 0);
1037 }
b94dc6b5 1038 } else
1da177e4
LT		 1039 recursively_mark_NOTATTACHED(udev);
1040 spin_unlock_irqrestore(&device_state_lock, flags);
1041}
1da177e4
LT		 1042
1043
d388dab7 1044#ifdef CONFIG_PM
1c50c317
AS		 1045
1046/**
1047 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1048 * @rhdev: struct usb_device for the root hub
1049 *
1050 * The USB host controller driver calls this function when its root hub
1051 * is resumed and Vbus power has been interrupted or the controller
1052 * has been reset. The routine marks all the children of the root hub
1053 * as NOTATTACHED and marks logical connect-change events on their ports.
1054 */
1055void usb_root_hub_lost_power(struct usb_device *rhdev)
1056{
1057 struct usb_hub *hub;
1058 int port1;
1059 unsigned long flags;
1060
1061 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1062 spin_lock_irqsave(&device_state_lock, flags);
1063 hub = hdev_to_hub(rhdev);
1064 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1065 if (rhdev->children[port1 - 1]) {
1066 recursively_mark_NOTATTACHED(
1067 rhdev->children[port1 - 1]);
1068 set_bit(port1, hub->change_bits);
1069 }
1070 }
1071 spin_unlock_irqrestore(&device_state_lock, flags);
1072}
1073EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1074
d388dab7 1075#endif /* CONFIG_PM */
1c50c317 1076
1da177e4
LT		 1077static void choose_address(struct usb_device *udev)
1078{
1079 int devnum;
1080 struct usb_bus *bus = udev->bus;
1081
1082 /* If khubd ever becomes multithreaded, this will need a lock */
1083
1084 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1085 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1086 bus->devnum_next);
1087 if (devnum >= 128)
1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1089
1090 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1091
1092 if (devnum < 128) {
1093 set_bit(devnum, bus->devmap.devicemap);
1094 udev->devnum = devnum;
1095 }
1096}
1097
1098static void release_address(struct usb_device *udev)
1099{
1100 if (udev->devnum > 0) {
1101 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1102 udev->devnum = -1;
1103 }
1104}
1105
1106/**
1107 * usb_disconnect - disconnect a device (usbcore-internal)
1108 * @pdev: pointer to device being disconnected
1109 * Context: !in_interrupt ()
1110 *
1111 * Something got disconnected. Get rid of it and all of its children.
1112 *
1113 * If *pdev is a normal device then the parent hub must already be locked.
1114 * If *pdev is a root hub then this routine will acquire the
1115 * usb_bus_list_lock on behalf of the caller.
1116 *
1117 * Only hub drivers (including virtual root hub drivers for host
1118 * controllers) should ever call this.
1119 *
1120 * This call is synchronous, and may not be used in an interrupt context.
1121 */
1122void usb_disconnect(struct usb_device **pdev)
1123{
1124 struct usb_device *udev = *pdev;
1125 int i;
1126
1127 if (!udev) {
1128 pr_debug ("%s nodev\n", __FUNCTION__);
1129 return;
1130 }
1131
1132 /* mark the device as inactive, so any further urb submissions for
1133 * this device (and any of its children) will fail immediately.
1134 * this quiesces everyting except pending urbs.
1135 */
1136 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1137 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1138
9ad3d6cc
AS		 1139 usb_lock_device(udev);
1140
1da177e4
LT		 1141 /* Free up all the children before we remove this device */
1142 for (i = 0; i < USB_MAXCHILDREN; i++) {
1143 if (udev->children[i])
1144 usb_disconnect(&udev->children[i]);
1145 }
1146
1147 /* deallocate hcd/hardware state ... nuking all pending urbs and
1148 * cleaning up all state associated with the current configuration
1149 * so that the hardware is now fully quiesced.
1150 */
782da727 1151 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1152 usb_disable_device(udev, 0);
1153
782da727
AS		 1154 usb_unlock_device(udev);
1155
1156 /* Unregister the device. The device driver is responsible
1157 * for removing the device files from usbfs and sysfs and for
1158 * de-configuring the device.
1159 */
1160 device_del(&udev->dev);
3099e75a 1161
782da727 1162 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1163 * (or root_hub) pointer.
1164 */
1da177e4 1165 release_address(udev);
1da177e4
LT		 1166
1167 /* Avoid races with recursively_mark_NOTATTACHED() */
1168 spin_lock_irq(&device_state_lock);
1169 *pdev = NULL;
1170 spin_unlock_irq(&device_state_lock);
1171
782da727 1172 put_device(&udev->dev);
1da177e4
LT		 1173}
1174
1175#ifdef DEBUG
1176static void show_string(struct usb_device *udev, char *id, char *string)
1177{
1178 if (!string)
1179 return;
1180 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1181}
1182
1183#else
1184static inline void show_string(struct usb_device *udev, char *id, char *string)
1185{}
1186#endif
1187
1da177e4
LT		 1188
1189#ifdef CONFIG_USB_OTG
1190#include "otg_whitelist.h"
1191#endif
1192
1193/**
1194 * usb_new_device - perform initial device setup (usbcore-internal)
1195 * @udev: newly addressed device (in ADDRESS state)
1196 *
1197 * This is called with devices which have been enumerated, but not yet
1198 * configured. The device descriptor is available, but not descriptors
9ad3d6cc
AS		 1199 * for any device configuration. The caller must have locked either
1200 * the parent hub (if udev is a normal device) or else the
1da177e4
LT		 1201 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1202 * udev has already been installed, but udev is not yet visible through
1203 * sysfs or other filesystem code.
1204 *
1205 * Returns 0 for success (device is configured and listed, with its
1206 * interfaces, in sysfs); else a negative errno value.
1207 *
1208 * This call is synchronous, and may not be used in an interrupt context.
1209 *
9ad3d6cc 1210 * Only the hub driver or root-hub registrar should ever call this.
1da177e4
LT		 1211 */
1212int usb_new_device(struct usb_device *udev)
1213{
1214 int err;
1da177e4
LT		 1215
1216 err = usb_get_configuration(udev);
1217 if (err < 0) {
1218 dev_err(&udev->dev, "can't read configurations, error %d\n",
1219 err);
1220 goto fail;
1221 }
1222
1223 /* read the standard strings and cache them if present */
4f62efe6
AS		 1224 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1225 udev->manufacturer = usb_cache_string(udev,
1226 udev->descriptor.iManufacturer);
1227 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1228
1229 /* Tell the world! */
1230 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1231 "SerialNumber=%d\n",
1232 udev->descriptor.iManufacturer,
1233 udev->descriptor.iProduct,
1234 udev->descriptor.iSerialNumber);
1235 show_string(udev, "Product", udev->product);
1236 show_string(udev, "Manufacturer", udev->manufacturer);
1237 show_string(udev, "SerialNumber", udev->serial);
1238
1239#ifdef CONFIG_USB_OTG
1240 /*
1241 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1242 * to wake us after we've powered off VBUS; and HNP, switching roles
1243 * "host" to "peripheral". The OTG descriptor helps figure this out.
1244 */
1245 if (!udev->bus->is_b_host
1246 && udev->config
1247 && udev->parent == udev->bus->root_hub) {
1248 struct usb_otg_descriptor *desc = 0;
1249 struct usb_bus *bus = udev->bus;
1250
1251 /* descriptor may appear anywhere in config */
1252 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1253 le16_to_cpu(udev->config[0].desc.wTotalLength),
1254 USB_DT_OTG, (void **) &desc) == 0) {
1255 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1256 unsigned port1 = udev->portnum;
1da177e4
LT		 1257 struct usb_device *root = udev->parent;
1258
1da177e4
LT		 1259 dev_info(&udev->dev,
1260 "Dual-Role OTG device on %sHNP port\n",
1261 (port1 == bus->otg_port)
1262 ? "" : "non-");
1263
1264 /* enable HNP before suspend, it's simpler */
1265 if (port1 == bus->otg_port)
1266 bus->b_hnp_enable = 1;
1267 err = usb_control_msg(udev,
1268 usb_sndctrlpipe(udev, 0),
1269 USB_REQ_SET_FEATURE, 0,
1270 bus->b_hnp_enable
1271 ? USB_DEVICE_B_HNP_ENABLE
1272 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1273 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1274 if (err < 0) {
1275 /* OTG MESSAGE: report errors here,
1276 * customize to match your product.
1277 */
1278 dev_info(&udev->dev,
1279 "can't set HNP mode; %d\n",
1280 err);
1281 bus->b_hnp_enable = 0;
1282 }
1283 }
1284 }
1285 }
1286
1287 if (!is_targeted(udev)) {
1288
1289 /* Maybe it can talk to us, though we can't talk to it.
1290 * (Includes HNP test device.)
1291 */
1292 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
140d8f68 1293 static int __usb_port_suspend(struct usb_device *,
390a8c34 1294 int port1);
140d8f68 1295 err = __usb_port_suspend(udev, udev->bus->otg_port);
1da177e4
LT		 1296 if (err < 0)
1297 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1298 }
1299 err = -ENODEV;
1300 goto fail;
1301 }
1302#endif
1303
782da727
AS		 1304 /* Register the device. The device driver is responsible
1305 * for adding the device files to usbfs and sysfs and for
1306 * configuring the device.
1307 */
1da177e4
LT		 1308 err = device_add (&udev->dev);
1309 if (err) {
1310 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1311 goto fail;
1312 }
9ad3d6cc 1313
1da177e4
LT		 1314 return 0;
1315
1316fail:
1317 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1318 return err;
1319}
1320
1321
1322static int hub_port_status(struct usb_hub *hub, int port1,
1323 u16 *status, u16 *change)
1324{
1325 int ret;
1326
1327 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1328 if (ret < 0)
1329 dev_err (hub->intfdev,
1330 "%s failed (err = %d)\n", __FUNCTION__, ret);
1331 else {
1332 *status = le16_to_cpu(hub->status->port.wPortStatus);
1333 *change = le16_to_cpu(hub->status->port.wPortChange);
1334 ret = 0;
1335 }
1336 return ret;
1337}
1338
1339#define PORT_RESET_TRIES 5
1340#define SET_ADDRESS_TRIES 2
1341#define GET_DESCRIPTOR_TRIES 2
1342#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1343#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1344
1345#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1346#define HUB_SHORT_RESET_TIME 10
1347#define HUB_LONG_RESET_TIME 200
1348#define HUB_RESET_TIMEOUT 500
1349
1350static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1351 struct usb_device *udev, unsigned int delay)
1352{
1353 int delay_time, ret;
1354 u16 portstatus;
1355 u16 portchange;
1356
1357 for (delay_time = 0;
1358 delay_time < HUB_RESET_TIMEOUT;
1359 delay_time += delay) {
1360 /* wait to give the device a chance to reset */
1361 msleep(delay);
1362
1363 /* read and decode port status */
1364 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1365 if (ret < 0)
1366 return ret;
1367
1368 /* Device went away? */
1369 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1370 return -ENOTCONN;
1371
1372 /* bomb out completely if something weird happened */
1373 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1374 return -EINVAL;
1375
1376 /* if we`ve finished resetting, then break out of the loop */
1377 if (!(portstatus & USB_PORT_STAT_RESET) &&
1378 (portstatus & USB_PORT_STAT_ENABLE)) {
1379 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1380 udev->speed = USB_SPEED_HIGH;
1381 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1382 udev->speed = USB_SPEED_LOW;
1383 else
1384 udev->speed = USB_SPEED_FULL;
1385 return 0;
1386 }
1387
1388 /* switch to the long delay after two short delay failures */
1389 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1390 delay = HUB_LONG_RESET_TIME;
1391
1392 dev_dbg (hub->intfdev,
1393 "port %d not reset yet, waiting %dms\n",
1394 port1, delay);
1395 }
1396
1397 return -EBUSY;
1398}
1399
1400static int hub_port_reset(struct usb_hub *hub, int port1,
1401 struct usb_device *udev, unsigned int delay)
1402{
1403 int i, status;
1404
1405 /* Reset the port */
1406 for (i = 0; i < PORT_RESET_TRIES; i++) {
1407 status = set_port_feature(hub->hdev,
1408 port1, USB_PORT_FEAT_RESET);
1409 if (status)
1410 dev_err(hub->intfdev,
1411 "cannot reset port %d (err = %d)\n",
1412 port1, status);
1413 else {
1414 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1415 if (status && status != -ENOTCONN)
1da177e4
LT		 1416 dev_dbg(hub->intfdev,
1417 "port_wait_reset: err = %d\n",
1418 status);
1419 }
1420
1421 /* return on disconnect or reset */
1422 switch (status) {
1423 case 0:
b789696a
DB		 1424 /* TRSTRCY = 10 ms; plus some extra */
1425 msleep(10 + 40);
1da177e4
LT		 1426 /* FALL THROUGH */
1427 case -ENOTCONN:
1428 case -ENODEV:
1429 clear_port_feature(hub->hdev,
1430 port1, USB_PORT_FEAT_C_RESET);
1431 /* FIXME need disconnect() for NOTATTACHED device */
1432 usb_set_device_state(udev, status
1433 ? USB_STATE_NOTATTACHED
1434 : USB_STATE_DEFAULT);
1435 return status;
1436 }
1437
1438 dev_dbg (hub->intfdev,
1439 "port %d not enabled, trying reset again...\n",
1440 port1);
1441 delay = HUB_LONG_RESET_TIME;
1442 }
1443
1444 dev_err (hub->intfdev,
1445 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1446 port1);
1447
1448 return status;
1449}
1450
1da177e4
LT		 1451/*
1452 * Disable a port and mark a logical connnect-change event, so that some
1453 * time later khubd will disconnect() any existing usb_device on the port
1454 * and will re-enumerate if there actually is a device attached.
1455 */
1456static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1457{
1458 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1459 hub_port_disable(hub, port1, 1);
1460
1461 /* FIXME let caller ask to power down the port:
1462 * - some devices won't enumerate without a VBUS power cycle
1463 * - SRP saves power that way
390a8c34 1464 * - ... new call, TBD ...
1da177e4
LT		 1465 * That's easy if this hub can switch power per-port, and
1466 * khubd reactivates the port later (timer, SRP, etc).
1467 * Powerdown must be optional, because of reset/DFU.
1468 */
1469
1470 set_bit(port1, hub->change_bits);
1471 kick_khubd(hub);
1472}
1473
d388dab7 1474#ifdef CONFIG_PM
1da177e4
LT		 1475
1476#ifdef CONFIG_USB_SUSPEND
1477
1478/*
1479 * Selective port suspend reduces power; most suspended devices draw
1480 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1481 * All devices below the suspended port are also suspended.
1482 *
1483 * Devices leave suspend state when the host wakes them up. Some devices
1484 * also support "remote wakeup", where the device can activate the USB
1485 * tree above them to deliver data, such as a keypress or packet. In
1486 * some cases, this wakes the USB host.
1487 */
1488static int hub_port_suspend(struct usb_hub *hub, int port1,
1489 struct usb_device *udev)
1490{
1491 int status;
1492
1493 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1494
1495 /* enable remote wakeup when appropriate; this lets the device
1496 * wake up the upstream hub (including maybe the root hub).
1497 *
1498 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1499 * we don't explicitly enable it here.
1500 */
b94dc6b5 1501 if (device_may_wakeup(&udev->dev)) {
1da177e4
LT		 1502 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1503 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1504 USB_DEVICE_REMOTE_WAKEUP, 0,
1505 NULL, 0,
1506 USB_CTRL_SET_TIMEOUT);
1507 if (status)
1508 dev_dbg(&udev->dev,
1509 "won't remote wakeup, status %d\n",
1510 status);
1511 }
1512
1513 /* see 7.1.7.6 */
1514 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1515 if (status) {
1516 dev_dbg(hub->intfdev,
1517 "can't suspend port %d, status %d\n",
1518 port1, status);
1519 /* paranoia: "should not happen" */
1520 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1521 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1522 USB_DEVICE_REMOTE_WAKEUP, 0,
1523 NULL, 0,
1524 USB_CTRL_SET_TIMEOUT);
1525 } else {
1526 /* device has up to 10 msec to fully suspend */
1527 dev_dbg(&udev->dev, "usb suspend\n");
1528 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1529 msleep(10);
1530 }
1531 return status;
1532}
1533
1534/*
1535 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1536 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1537 * State transitions include:
1538 *
1539 * - suspend, resume ... when the VBUS power link stays live
1540 * - suspend, disconnect ... VBUS lost
1541 *
1542 * Once VBUS drop breaks the circuit, the port it's using has to go through
1543 * normal re-enumeration procedures, starting with enabling VBUS power.
1544 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1545 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1546 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1547 *
1548 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1549 * the root hub for their bus goes into global suspend ... so we don't
1550 * (falsely) update the device power state to say it suspended.
1da177e4 1551 */
140d8f68 1552static int __usb_port_suspend (struct usb_device *udev, int port1)
1da177e4 1553{
f3f3253d 1554 int status = 0;
1da177e4
LT		 1555
1556 /* caller owns the udev device lock */
1557 if (port1 < 0)
1558 return port1;
1559
140d8f68
AS		 1560 /* we change the device's upstream USB link,
1561 * but root hubs have no upstream USB link.
1da177e4 1562 */
f3f3253d 1563 if (udev->parent)
1da177e4
LT		 1564 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1565 udev);
2bf4086d
AS		 1566 else {
1567 dev_dbg(&udev->dev, "usb suspend\n");
1568 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1569 }
1da177e4
LT		 1570 return status;
1571}
1572
5edbfb7c 1573/*
140d8f68 1574 * usb_port_suspend - suspend a usb device's upstream port
1da177e4 1575 * @udev: device that's no longer in active use
5edbfb7c 1576 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1577 *
1578 * Suspends a USB device that isn't in active use, conserving power.
1579 * Devices may wake out of a suspend, if anything important happens,
1580 * using the remote wakeup mechanism. They may also be taken out of
140d8f68 1581 * suspend by the host, using usb_port_resume(). It's also routine
1da177e4
LT		 1582 * to disconnect devices while they are suspended.
1583 *
390a8c34
DB		 1584 * This only affects the USB hardware for a device; its interfaces
1585 * (and, for hubs, child devices) must already have been suspended.
1586 *
1da177e4
LT		 1587 * Suspending OTG devices may trigger HNP, if that's been enabled
1588 * between a pair of dual-role devices. That will change roles, such
1589 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1590 *
1591 * Returns 0 on success, else negative errno.
1592 */
140d8f68 1593int usb_port_suspend(struct usb_device *udev)
1da177e4 1594{
140d8f68 1595 return __usb_port_suspend(udev, udev->portnum);
1da177e4 1596}
f3f3253d 1597
1da177e4 1598/*
390a8c34
DB		 1599 * If the USB "suspend" state is in use (rather than "global suspend"),
1600 * many devices will be individually taken out of suspend state using
1601 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1602 * hardware resume signaling is finished, either because of selective
1603 * resume (by host) or remote wakeup (by device) ... now see what changed
1604 * in the tree that's rooted at this device.
1605 */
140d8f68 1606static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1607{
1608 int status;
1609 u16 devstatus;
1610
1611 /* caller owns the udev device lock */
f3f3253d 1612 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1613
1614 /* usb ch9 identifies four variants of SUSPENDED, based on what
1615 * state the device resumes to. Linux currently won't see the
1616 * first two on the host side; they'd be inside hub_port_init()
1617 * during many timeouts, but khubd can't suspend until later.
1618 */
1619 usb_set_device_state(udev, udev->actconfig
1620 ? USB_STATE_CONFIGURED
1621 : USB_STATE_ADDRESS);
1da177e4
LT		 1622
1623 /* 10.5.4.5 says be sure devices in the tree are still there.
1624 * For now let's assume the device didn't go crazy on resume,
1625 * and device drivers will know about any resume quirks.
1626 */
1627 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1628 if (status >= 0)
1629 status = (status == 2 ? 0 : -ENODEV);
1630
1631 if (status)
1da177e4
LT		 1632 dev_dbg(&udev->dev,
1633 "gone after usb resume? status %d\n",
1634 status);
1635 else if (udev->actconfig) {
1da177e4 1636 le16_to_cpus(&devstatus);
55c52718 1637 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1638 && udev->parent) {
1da177e4
LT		 1639 status = usb_control_msg(udev,
1640 usb_sndctrlpipe(udev, 0),
1641 USB_REQ_CLEAR_FEATURE,
1642 USB_RECIP_DEVICE,
1643 USB_DEVICE_REMOTE_WAKEUP, 0,
1644 NULL, 0,
1645 USB_CTRL_SET_TIMEOUT);
a8e7c565 1646 if (status)
1da177e4
LT		 1647 dev_dbg(&udev->dev, "disable remote "
1648 "wakeup, status %d\n", status);
4bf0ba86 1649 }
1da177e4
LT		 1650 status = 0;
1651
1652 } else if (udev->devnum <= 0) {
1653 dev_dbg(&udev->dev, "bogus resume!\n");
1654 status = -EINVAL;
1655 }
1656 return status;
1657}
1658
1659static int
1660hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1661{
1662 int status;
1663
1664 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1665
1666 /* see 7.1.7.7; affects power usage, but not budgeting */
1667 status = clear_port_feature(hub->hdev,
1668 port1, USB_PORT_FEAT_SUSPEND);
1669 if (status) {
1670 dev_dbg(hub->intfdev,
1671 "can't resume port %d, status %d\n",
1672 port1, status);
1673 } else {
1674 u16 devstatus;
1675 u16 portchange;
1676
1677 /* drive resume for at least 20 msec */
1678 if (udev)
1679 dev_dbg(&udev->dev, "RESUME\n");
1680 msleep(25);
1681
1682#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1683 | USB_PORT_STAT_ENABLE \
1684 | USB_PORT_STAT_CONNECTION)
1685
1686 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1687 * stop resume signaling. Then finish the resume
1688 * sequence.
1689 */
1690 devstatus = portchange = 0;
1691 status = hub_port_status(hub, port1,
1692 &devstatus, &portchange);
1693 if (status < 0
1694 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1695 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1696 ) {
1697 dev_dbg(hub->intfdev,
1698 "port %d status %04x.%04x after resume, %d\n",
1699 port1, portchange, devstatus, status);
20307949
AS		 1700 if (status >= 0)
1701 status = -ENODEV;
1da177e4 1702 } else {
20307949
AS		 1703 if (portchange & USB_PORT_STAT_C_SUSPEND)
1704 clear_port_feature(hub->hdev, port1,
1705 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1706 /* TRSMRCY = 10 msec */
1707 msleep(10);
1708 if (udev)
140d8f68 1709 status = finish_port_resume(udev);
1da177e4
LT		 1710 }
1711 }
1712 if (status < 0)
1713 hub_port_logical_disconnect(hub, port1);
1714
1715 return status;
1716}
1717
5edbfb7c 1718/*
140d8f68 1719 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1720 * @udev: device to re-activate
5edbfb7c 1721 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1722 *
1723 * This will re-activate the suspended device, increasing power usage
1724 * while letting drivers communicate again with its endpoints.
1725 * USB resume explicitly guarantees that the power session between
1726 * the host and the device is the same as it was when the device
1727 * suspended.
1728 *
1729 * Returns 0 on success, else negative errno.
1730 */
140d8f68 1731int usb_port_resume(struct usb_device *udev)
1da177e4 1732{
d388dab7 1733 int status;
1da177e4 1734
140d8f68
AS		 1735 /* we change the device's upstream USB link,
1736 * but root hubs have no upstream USB link.
1737 */
f3f3253d 1738 if (udev->parent) {
114b368c
AS		 1739 // NOTE this fails if parent is also suspended...
1740 status = hub_port_resume(hdev_to_hub(udev->parent),
1741 udev->portnum, udev);
fb669cc0 1742 } else
140d8f68 1743 status = finish_port_resume(udev);
f3f3253d 1744 if (status < 0)
a8e7c565 1745 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1746 return status;
1747}
1748
1749static int remote_wakeup(struct usb_device *udev)
1750{
1751 int status = 0;
1752
1753 /* don't repeat RESUME sequence if this device
1754 * was already woken up by some other task
1755 */
9ad3d6cc 1756 usb_lock_device(udev);
1da177e4
LT		 1757 if (udev->state == USB_STATE_SUSPENDED) {
1758 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1759 /* TRSMRCY = 10 msec */
1760 msleep(10);
140d8f68 1761 status = finish_port_resume(udev);
1da177e4 1762 }
a8e7c565
AS		 1763
1764 if (status == 0)
1765 usb_resume_both(udev);
9ad3d6cc 1766 usb_unlock_device(udev);
1da177e4
LT		 1767 return status;
1768}
1769
d388dab7
AS		 1770#else /* CONFIG_USB_SUSPEND */
1771
1772/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1773
1774int usb_port_suspend(struct usb_device *udev)
1775{
1776 return 0;
1777}
1778
1779static inline int
1780finish_port_resume(struct usb_device *udev)
1781{
1782 return 0;
1783}
1784
1785static inline int
1786hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1787{
1788 return 0;
1789}
1790
1791int usb_port_resume(struct usb_device *udev)
1792{
1793 return 0;
1794}
1795
1796static inline int remote_wakeup(struct usb_device *udev)
1797{
1798 return 0;
1799}
1800
1801#endif
1802
db690874 1803static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1804{
1805 struct usb_hub *hub = usb_get_intfdata (intf);
1806 struct usb_device *hdev = hub->hdev;
1807 unsigned port1;
1da177e4 1808
c9f89fa4 1809 /* fail if children aren't already suspended */
1da177e4
LT		 1810 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1811 struct usb_device *udev;
1812
1813 udev = hdev->children [port1-1];
114b368c 1814 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1815#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1816 udev->state != USB_STATE_SUSPENDED
1817#else
1818 udev->dev.power.power_state.event
1819 == PM_EVENT_ON
f3f3253d 1820#endif
114b368c 1821 ) {
c9f89fa4
DB		 1822 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1823 return -EBUSY;
1824 }
1da177e4
LT		 1825 }
1826
f3f3253d
DB		 1827 /* "global suspend" of the downstream HC-to-USB interface */
1828 if (!hdev->parent) {
1829 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1830 if (bus) {
1831 int status = hcd_bus_suspend (bus);
f3f3253d
DB		 1832
1833 if (status != 0) {
1834 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1835 status);
1836 return status;
1837 }
1838 } else
1839 return -EOPNOTSUPP;
1840 }
1841
c9f89fa4
DB		 1842 /* stop khubd and related activity */
1843 hub_quiesce(hub);
1da177e4
LT		 1844 return 0;
1845}
1846
1847static int hub_resume(struct usb_interface *intf)
1848{
1849 struct usb_device *hdev = interface_to_usbdev(intf);
1850 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4
LT		 1851 int status;
1852
f3f3253d
DB		 1853 /* "global resume" of the downstream HC-to-USB interface */
1854 if (!hdev->parent) {
1855 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1856 if (bus) {
1857 status = hcd_bus_resume (bus);
f3f3253d
DB		 1858 if (status) {
1859 dev_dbg(&intf->dev, "'global' resume %d\n",
1860 status);
1861 return status;
1862 }
1863 } else
1864 return -EOPNOTSUPP;
1865 if (status == 0) {
1866 /* TRSMRCY = 10 msec */
1867 msleep(10);
1868 }
1869 }
1870
a8e7c565 1871 /* tell khubd to look for changes on this hub */
f3f3253d 1872 hub_activate(hub);
1da177e4
LT		 1873 return 0;
1874}
1875
d388dab7
AS		 1876#else /* CONFIG_PM */
1877
1878static inline int remote_wakeup(struct usb_device *udev)
1879{
1880 return 0;
1881}
1882
1883#endif
1884
979d5199
DB		 1885void usb_suspend_root_hub(struct usb_device *hdev)
1886{
1887 struct usb_hub *hub = hdev_to_hub(hdev);
1888
1889 /* This also makes any led blinker stop retriggering. We're called
1890 * from irq, so the blinker might still be scheduled. Caller promises
1891 * that the root hub status URB will be canceled.
1892 */
1893 __hub_quiesce(hub);
1894 mark_quiesced(to_usb_interface(hub->intfdev));
1895}
1896
1da177e4
LT		 1897void usb_resume_root_hub(struct usb_device *hdev)
1898{
1899 struct usb_hub *hub = hdev_to_hub(hdev);
1900
1901 hub->resume_root_hub = 1;
1902 kick_khubd(hub);
1903}
1904
1da177e4
LT		 1905
1906/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1907 *
1908 * Between connect detection and reset signaling there must be a delay
1909 * of 100ms at least for debounce and power-settling. The corresponding
1910 * timer shall restart whenever the downstream port detects a disconnect.
1911 *
1912 * Apparently there are some bluetooth and irda-dongles and a number of
1913 * low-speed devices for which this debounce period may last over a second.
1914 * Not covered by the spec - but easy to deal with.
1915 *
1916 * This implementation uses a 1500ms total debounce timeout; if the
1917 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1918 * every 25ms for transient disconnects. When the port status has been
1919 * unchanged for 100ms it returns the port status.
1920 */
1921
1922#define HUB_DEBOUNCE_TIMEOUT 1500
1923#define HUB_DEBOUNCE_STEP 25
1924#define HUB_DEBOUNCE_STABLE 100
1925
1926static int hub_port_debounce(struct usb_hub *hub, int port1)
1927{
1928 int ret;
1929 int total_time, stable_time = 0;
1930 u16 portchange, portstatus;
1931 unsigned connection = 0xffff;
1932
1933 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
1934 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1935 if (ret < 0)
1936 return ret;
1937
1938 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
1939 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
1940 stable_time += HUB_DEBOUNCE_STEP;
1941 if (stable_time >= HUB_DEBOUNCE_STABLE)
1942 break;
1943 } else {
1944 stable_time = 0;
1945 connection = portstatus & USB_PORT_STAT_CONNECTION;
1946 }
1947
1948 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1949 clear_port_feature(hub->hdev, port1,
1950 USB_PORT_FEAT_C_CONNECTION);
1951 }
1952
1953 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
1954 break;
1955 msleep(HUB_DEBOUNCE_STEP);
1956 }
1957
1958 dev_dbg (hub->intfdev,
1959 "debounce: port %d: total %dms stable %dms status 0x%x\n",
1960 port1, total_time, stable_time, portstatus);
1961
1962 if (stable_time < HUB_DEBOUNCE_STABLE)
1963 return -ETIMEDOUT;
1964 return portstatus;
1965}
1966
1967static void ep0_reinit(struct usb_device *udev)
1968{
1969 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
1970 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
1971 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
1972}
1973
1974#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
1975#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
1976
1977static int hub_set_address(struct usb_device *udev)
1978{
1979 int retval;
1980
1981 if (udev->devnum == 0)
1982 return -EINVAL;
1983 if (udev->state == USB_STATE_ADDRESS)
1984 return 0;
1985 if (udev->state != USB_STATE_DEFAULT)
1986 return -EINVAL;
1987 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
1988 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
1989 NULL, 0, USB_CTRL_SET_TIMEOUT);
1990 if (retval == 0) {
1991 usb_set_device_state(udev, USB_STATE_ADDRESS);
1992 ep0_reinit(udev);
1993 }
1994 return retval;
1995}
1996
1997/* Reset device, (re)assign address, get device descriptor.
1998 * Device connection must be stable, no more debouncing needed.
1999 * Returns device in USB_STATE_ADDRESS, except on error.
2000 *
2001 * If this is called for an already-existing device (as part of
2002 * usb_reset_device), the caller must own the device lock. For a
2003 * newly detected device that is not accessible through any global
2004 * pointers, it's not necessary to lock the device.
2005 */
2006static int
2007hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2008 int retry_counter)
2009{
4186ecf8 2010 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2011
2012 struct usb_device *hdev = hub->hdev;
2013 int i, j, retval;
2014 unsigned delay = HUB_SHORT_RESET_TIME;
2015 enum usb_device_speed oldspeed = udev->speed;
2016
2017 /* root hub ports have a slightly longer reset period
2018 * (from USB 2.0 spec, section 7.1.7.5)
2019 */
2020 if (!hdev->parent) {
2021 delay = HUB_ROOT_RESET_TIME;
2022 if (port1 == hdev->bus->otg_port)
2023 hdev->bus->b_hnp_enable = 0;
2024 }
2025
2026 /* Some low speed devices have problems with the quick delay, so */
2027 /* be a bit pessimistic with those devices. RHbug #23670 */
2028 if (oldspeed == USB_SPEED_LOW)
2029 delay = HUB_LONG_RESET_TIME;
2030
4186ecf8 2031 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2032
2033 /* Reset the device; full speed may morph to high speed */
2034 retval = hub_port_reset(hub, port1, udev, delay);
2035 if (retval < 0) /* error or disconnect */
2036 goto fail;
2037 /* success, speed is known */
2038 retval = -ENODEV;
2039
2040 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2041 dev_dbg(&udev->dev, "device reset changed speed!\n");
2042 goto fail;
2043 }
2044 oldspeed = udev->speed;
2045
2046 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2047 * it's fixed size except for full speed devices.
2048 */
2049 switch (udev->speed) {
2050 case USB_SPEED_HIGH: /* fixed at 64 */
2051 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2052 break;
2053 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2054 /* to determine the ep0 maxpacket size, try to read
2055 * the device descriptor to get bMaxPacketSize0 and
2056 * then correct our initial guess.
2057 */
2058 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2059 break;
2060 case USB_SPEED_LOW: /* fixed at 8 */
2061 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2062 break;
2063 default:
2064 goto fail;
2065 }
2066
2067 dev_info (&udev->dev,
2068 "%s %s speed USB device using %s and address %d\n",
2069 (udev->config) ? "reset" : "new",
2070 ({ char *speed; switch (udev->speed) {
2071 case USB_SPEED_LOW: speed = "low"; break;
2072 case USB_SPEED_FULL: speed = "full"; break;
2073 case USB_SPEED_HIGH: speed = "high"; break;
2074 default: speed = "?"; break;
2075 }; speed;}),
2076 udev->bus->controller->driver->name,
2077 udev->devnum);
2078
2079 /* Set up TT records, if needed */
2080 if (hdev->tt) {
2081 udev->tt = hdev->tt;
2082 udev->ttport = hdev->ttport;
2083 } else if (udev->speed != USB_SPEED_HIGH
2084 && hdev->speed == USB_SPEED_HIGH) {
2085 udev->tt = &hub->tt;
2086 udev->ttport = port1;
2087 }
2088
2089 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2090 * Because device hardware and firmware is sometimes buggy in
2091 * this area, and this is how Linux has done it for ages.
2092 * Change it cautiously.
2093 *
2094 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2095 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2096 * so it may help with some non-standards-compliant devices.
2097 * Otherwise we start with SET_ADDRESS and then try to read the
2098 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2099 * value.
2100 */
2101 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2102 if (USE_NEW_SCHEME(retry_counter)) {
2103 struct usb_device_descriptor *buf;
2104 int r = 0;
2105
2106#define GET_DESCRIPTOR_BUFSIZE 64
2107 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2108 if (!buf) {
2109 retval = -ENOMEM;
2110 continue;
2111 }
2112
2113 /* Use a short timeout the first time through,
2114 * so that recalcitrant full-speed devices with
2115 * 8- or 16-byte ep0-maxpackets won't slow things
2116 * down tremendously by NAKing the unexpectedly
2117 * early status stage. Also, retry on all errors;
2118 * some devices are flakey.
2119 */
2120 for (j = 0; j < 3; ++j) {
2121 buf->bMaxPacketSize0 = 0;
2122 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2123 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2124 USB_DT_DEVICE << 8, 0,
2125 buf, GET_DESCRIPTOR_BUFSIZE,
2126 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2127 switch (buf->bMaxPacketSize0) {
2128 case 8: case 16: case 32: case 64:
2129 if (buf->bDescriptorType ==
2130 USB_DT_DEVICE) {
2131 r = 0;
2132 break;
2133 }
2134 /* FALL THROUGH */
2135 default:
2136 if (r == 0)
2137 r = -EPROTO;
2138 break;
2139 }
2140 if (r == 0)
2141 break;
2142 }
2143 udev->descriptor.bMaxPacketSize0 =
2144 buf->bMaxPacketSize0;
2145 kfree(buf);
2146
2147 retval = hub_port_reset(hub, port1, udev, delay);
2148 if (retval < 0) /* error or disconnect */
2149 goto fail;
2150 if (oldspeed != udev->speed) {
2151 dev_dbg(&udev->dev,
2152 "device reset changed speed!\n");
2153 retval = -ENODEV;
2154 goto fail;
2155 }
2156 if (r) {
2157 dev_err(&udev->dev, "device descriptor "
2158 "read/%s, error %d\n",
2159 "64", r);
2160 retval = -EMSGSIZE;
2161 continue;
2162 }
2163#undef GET_DESCRIPTOR_BUFSIZE
2164 }
2165
2166 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2167 retval = hub_set_address(udev);
2168 if (retval >= 0)
2169 break;
2170 msleep(200);
2171 }
2172 if (retval < 0) {
2173 dev_err(&udev->dev,
2174 "device not accepting address %d, error %d\n",
2175 udev->devnum, retval);
2176 goto fail;
2177 }
2178
2179 /* cope with hardware quirkiness:
2180 * - let SET_ADDRESS settle, some device hardware wants it
2181 * - read ep0 maxpacket even for high and low speed,
2182 */
2183 msleep(10);
2184 if (USE_NEW_SCHEME(retry_counter))
2185 break;
2186
2187 retval = usb_get_device_descriptor(udev, 8);
2188 if (retval < 8) {
2189 dev_err(&udev->dev, "device descriptor "
2190 "read/%s, error %d\n",
2191 "8", retval);
2192 if (retval >= 0)
2193 retval = -EMSGSIZE;
2194 } else {
2195 retval = 0;
2196 break;
2197 }
2198 }
2199 if (retval)
2200 goto fail;
2201
2202 i = udev->descriptor.bMaxPacketSize0;
2203 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2204 if (udev->speed != USB_SPEED_FULL ||
2205 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2206 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2207 retval = -EMSGSIZE;
2208 goto fail;
2209 }
2210 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2211 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2212 ep0_reinit(udev);
2213 }
2214
2215 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2216 if (retval < (signed)sizeof(udev->descriptor)) {
2217 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2218 "all", retval);
2219 if (retval >= 0)
2220 retval = -ENOMSG;
2221 goto fail;
2222 }
2223
2224 retval = 0;
2225
2226fail:
2227 if (retval)
2228 hub_port_disable(hub, port1, 0);
4186ecf8 2229 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2230 return retval;
2231}
2232
2233static void
2234check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2235{
2236 struct usb_qualifier_descriptor *qual;
2237 int status;
2238
2239 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2240 if (qual == NULL)
2241 return;
2242
2243 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2244 qual, sizeof *qual);
2245 if (status == sizeof *qual) {
2246 dev_info(&udev->dev, "not running at top speed; "
2247 "connect to a high speed hub\n");
2248 /* hub LEDs are probably harder to miss than syslog */
2249 if (hub->has_indicators) {
2250 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2251 schedule_work (&hub->leds);
2252 }
2253 }
1bc3c9e1 2254 kfree(qual);
1da177e4
LT		 2255}
2256
2257static unsigned
2258hub_power_remaining (struct usb_hub *hub)
2259{
2260 struct usb_device *hdev = hub->hdev;
2261 int remaining;
55c52718 2262 int port1;
1da177e4 2263
55c52718 2264 if (!hub->limited_power)
1da177e4
LT		 2265 return 0;
2266
55c52718
AS		 2267 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2268 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2269 struct usb_device *udev = hdev->children[port1 - 1];
2270 int delta;
1da177e4
LT		 2271
2272 if (!udev)
2273 continue;
2274
55c52718
AS		 2275 /* Unconfigured devices may not use more than 100mA,
2276 * or 8mA for OTG ports */
1da177e4 2277 if (udev->actconfig)
55c52718
AS		 2278 delta = udev->actconfig->desc.bMaxPower * 2;
2279 else if (port1 != udev->bus->otg_port || hdev->parent)
2280 delta = 100;
1da177e4 2281 else
55c52718
AS		 2282 delta = 8;
2283 if (delta > hub->mA_per_port)
2284 dev_warn(&udev->dev, "%dmA is over %umA budget "
2285 "for port %d!\n",
2286 delta, hub->mA_per_port, port1);
1da177e4
LT		 2287 remaining -= delta;
2288 }
2289 if (remaining < 0) {
55c52718
AS		 2290 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2291 - remaining);
1da177e4
LT		 2292 remaining = 0;
2293 }
2294 return remaining;
2295}
2296
2297/* Handle physical or logical connection change events.
2298 * This routine is called when:
2299 * a port connection-change occurs;
2300 * a port enable-change occurs (often caused by EMI);
2301 * usb_reset_device() encounters changed descriptors (as from
2302 * a firmware download)
2303 * caller already locked the hub
2304 */
2305static void hub_port_connect_change(struct usb_hub *hub, int port1,
2306 u16 portstatus, u16 portchange)
2307{
2308 struct usb_device *hdev = hub->hdev;
2309 struct device *hub_dev = hub->intfdev;
74ad9bd2 2310 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2311 int status, i;
2312
2313 dev_dbg (hub_dev,
2314 "port %d, status %04x, change %04x, %s\n",
2315 port1, portstatus, portchange, portspeed (portstatus));
2316
2317 if (hub->has_indicators) {
2318 set_port_led(hub, port1, HUB_LED_AUTO);
2319 hub->indicator[port1-1] = INDICATOR_AUTO;
2320 }
2321
2322 /* Disconnect any existing devices under this port */
2323 if (hdev->children[port1-1])
2324 usb_disconnect(&hdev->children[port1-1]);
2325 clear_bit(port1, hub->change_bits);
2326
2327#ifdef CONFIG_USB_OTG
2328 /* during HNP, don't repeat the debounce */
2329 if (hdev->bus->is_b_host)
2330 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2331#endif
2332
2333 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2334 status = hub_port_debounce(hub, port1);
2335 if (status < 0) {
2336 dev_err (hub_dev,
2337 "connect-debounce failed, port %d disabled\n",
2338 port1);
2339 goto done;
2340 }
2341 portstatus = status;
2342 }
2343
2344 /* Return now if nothing is connected */
2345 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2346
2347 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2348 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2349 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2350 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2351
2352 if (portstatus & USB_PORT_STAT_ENABLE)
2353 goto done;
2354 return;
2355 }
2356
2357#ifdef CONFIG_USB_SUSPEND
2358 /* If something is connected, but the port is suspended, wake it up. */
2359 if (portstatus & USB_PORT_STAT_SUSPEND) {
2360 status = hub_port_resume(hub, port1, NULL);
2361 if (status < 0) {
2362 dev_dbg(hub_dev,
2363 "can't clear suspend on port %d; %d\n",
2364 port1, status);
2365 goto done;
2366 }
2367 }
2368#endif
2369
2370 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2371 struct usb_device *udev;
2372
2373 /* reallocate for each attempt, since references
2374 * to the previous one can escape in various ways
2375 */
2376 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2377 if (!udev) {
2378 dev_err (hub_dev,
2379 "couldn't allocate port %d usb_device\n",
2380 port1);
2381 goto done;
2382 }
2383
2384 usb_set_device_state(udev, USB_STATE_POWERED);
2385 udev->speed = USB_SPEED_UNKNOWN;
55c52718
AS		 2386 udev->bus_mA = hub->mA_per_port;
2387
1da177e4
LT		 2388 /* set the address */
2389 choose_address(udev);
2390 if (udev->devnum <= 0) {
2391 status = -ENOTCONN; /* Don't retry */
2392 goto loop;
2393 }
2394
2395 /* reset and get descriptor */
2396 status = hub_port_init(hub, udev, port1, i);
2397 if (status < 0)
2398 goto loop;
2399
2400 /* consecutive bus-powered hubs aren't reliable; they can
2401 * violate the voltage drop budget. if the new child has
2402 * a "powered" LED, users should notice we didn't enable it
2403 * (without reading syslog), even without per-port LEDs
2404 * on the parent.
2405 */
2406 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2407 && udev->bus_mA <= 100) {
1da177e4
LT		 2408 u16 devstat;
2409
2410 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2411 &devstat);
55c52718 2412 if (status < 2) {
1da177e4
LT		 2413 dev_dbg(&udev->dev, "get status %d ?\n", status);
2414 goto loop_disable;
2415 }
55c52718 2416 le16_to_cpus(&devstat);
1da177e4
LT		 2417 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2418 dev_err(&udev->dev,
2419 "can't connect bus-powered hub "
2420 "to this port\n");
2421 if (hub->has_indicators) {
2422 hub->indicator[port1-1] =
2423 INDICATOR_AMBER_BLINK;
2424 schedule_work (&hub->leds);
2425 }
2426 status = -ENOTCONN; /* Don't retry */
2427 goto loop_disable;
2428 }
2429 }
2430
2431 /* check for devices running slower than they could */
2432 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2433 && udev->speed == USB_SPEED_FULL
2434 && highspeed_hubs != 0)
2435 check_highspeed (hub, udev, port1);
2436
2437 /* Store the parent's children[] pointer. At this point
2438 * udev becomes globally accessible, although presumably
2439 * no one will look at it until hdev is unlocked.
2440 */
1da177e4
LT		 2441 status = 0;
2442
2443 /* We mustn't add new devices if the parent hub has
2444 * been disconnected; we would race with the
2445 * recursively_mark_NOTATTACHED() routine.
2446 */
2447 spin_lock_irq(&device_state_lock);
2448 if (hdev->state == USB_STATE_NOTATTACHED)
2449 status = -ENOTCONN;
2450 else
2451 hdev->children[port1-1] = udev;
2452 spin_unlock_irq(&device_state_lock);
2453
2454 /* Run it through the hoops (find a driver, etc) */
2455 if (!status) {
2456 status = usb_new_device(udev);
2457 if (status) {
2458 spin_lock_irq(&device_state_lock);
2459 hdev->children[port1-1] = NULL;
2460 spin_unlock_irq(&device_state_lock);
2461 }
2462 }
2463
1da177e4
LT		 2464 if (status)
2465 goto loop_disable;
2466
2467 status = hub_power_remaining(hub);
2468 if (status)
55c52718 2469 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2470
2471 return;
2472
2473loop_disable:
2474 hub_port_disable(hub, port1, 1);
2475loop:
2476 ep0_reinit(udev);
2477 release_address(udev);
2478 usb_put_dev(udev);
2479 if (status == -ENOTCONN)
2480 break;
2481 }
2482
2483done:
2484 hub_port_disable(hub, port1, 1);
2485}
2486
2487static void hub_events(void)
2488{
2489 struct list_head *tmp;
2490 struct usb_device *hdev;
2491 struct usb_interface *intf;
2492 struct usb_hub *hub;
2493 struct device *hub_dev;
2494 u16 hubstatus;
2495 u16 hubchange;
2496 u16 portstatus;
2497 u16 portchange;
2498 int i, ret;
2499 int connect_change;
2500
2501 /*
2502 * We restart the list every time to avoid a deadlock with
2503 * deleting hubs downstream from this one. This should be
2504 * safe since we delete the hub from the event list.
2505 * Not the most efficient, but avoids deadlocks.
2506 */
2507 while (1) {
2508
2509 /* Grab the first entry at the beginning of the list */
2510 spin_lock_irq(&hub_event_lock);
2511 if (list_empty(&hub_event_list)) {
2512 spin_unlock_irq(&hub_event_lock);
2513 break;
2514 }
2515
2516 tmp = hub_event_list.next;
2517 list_del_init(tmp);
2518
2519 hub = list_entry(tmp, struct usb_hub, event_list);
2520 hdev = hub->hdev;
2521 intf = to_usb_interface(hub->intfdev);
2522 hub_dev = &intf->dev;
2523
979d5199
DB		 2524 i = hub->resume_root_hub;
2525
2526 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
1da177e4
LT		 2527 hdev->state, hub->descriptor
2528 ? hub->descriptor->bNbrPorts
2529 : 0,
2530 /* NOTE: expects max 15 ports... */
2531 (u16) hub->change_bits[0],
979d5199
DB		 2532 (u16) hub->event_bits[0],
2533 i ? ", resume root" : "");
1da177e4
LT		 2534
2535 usb_get_intf(intf);
1da177e4
LT		 2536 spin_unlock_irq(&hub_event_lock);
2537
1da177e4
LT		 2538 /* Lock the device, then check to see if we were
2539 * disconnected while waiting for the lock to succeed. */
2540 if (locktree(hdev) < 0) {
2541 usb_put_intf(intf);
2542 continue;
2543 }
2544 if (hub != usb_get_intfdata(intf))
2545 goto loop;
2546
2547 /* If the hub has died, clean up after it */
2548 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2549 hub->error = -ENODEV;
2550 hub_pre_reset(intf);
1da177e4
LT		 2551 goto loop;
2552 }
2553
a8e7c565
AS		 2554 /* Is this is a root hub wanting to reactivate the downstream
2555 * ports? If so, be sure the interface resumes even if its
2556 * stub "device" node was never suspended.
2557 */
2558 if (i)
2559 usb_resume_both(hdev);
2560
1da177e4
LT		 2561 /* If this is an inactive or suspended hub, do nothing */
2562 if (hub->quiescing)
2563 goto loop;
2564
2565 if (hub->error) {
2566 dev_dbg (hub_dev, "resetting for error %d\n",
2567 hub->error);
2568
7de18d8b 2569 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2570 if (ret) {
2571 dev_dbg (hub_dev,
2572 "error resetting hub: %d\n", ret);
2573 goto loop;
2574 }
2575
2576 hub->nerrors = 0;
2577 hub->error = 0;
2578 }
2579
2580 /* deal with port status changes */
2581 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2582 if (test_bit(i, hub->busy_bits))
2583 continue;
2584 connect_change = test_bit(i, hub->change_bits);
2585 if (!test_and_clear_bit(i, hub->event_bits) &&
2586 !connect_change && !hub->activating)
2587 continue;
2588
2589 ret = hub_port_status(hub, i,
2590 &portstatus, &portchange);
2591 if (ret < 0)
2592 continue;
2593
2594 if (hub->activating && !hdev->children[i-1] &&
2595 (portstatus &
2596 USB_PORT_STAT_CONNECTION))
2597 connect_change = 1;
2598
2599 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2600 clear_port_feature(hdev, i,
2601 USB_PORT_FEAT_C_CONNECTION);
2602 connect_change = 1;
2603 }
2604
2605 if (portchange & USB_PORT_STAT_C_ENABLE) {
2606 if (!connect_change)
2607 dev_dbg (hub_dev,
2608 "port %d enable change, "
2609 "status %08x\n",
2610 i, portstatus);
2611 clear_port_feature(hdev, i,
2612 USB_PORT_FEAT_C_ENABLE);
2613
2614 /*
2615 * EM interference sometimes causes badly
2616 * shielded USB devices to be shutdown by
2617 * the hub, this hack enables them again.
2618 * Works at least with mouse driver.
2619 */
2620 if (!(portstatus & USB_PORT_STAT_ENABLE)
2621 && !connect_change
2622 && hdev->children[i-1]) {
2623 dev_err (hub_dev,
2624 "port %i "
2625 "disabled by hub (EMI?), "
2626 "re-enabling...\n",
2627 i);
2628 connect_change = 1;
2629 }
2630 }
2631
2632 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2633 clear_port_feature(hdev, i,
2634 USB_PORT_FEAT_C_SUSPEND);
2635 if (hdev->children[i-1]) {
2636 ret = remote_wakeup(hdev->
2637 children[i-1]);
2638 if (ret < 0)
2639 connect_change = 1;
2640 } else {
2641 ret = -ENODEV;
2642 hub_port_disable(hub, i, 1);
2643 }
2644 dev_dbg (hub_dev,
2645 "resume on port %d, status %d\n",
2646 i, ret);
2647 }
2648
2649 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2650 dev_err (hub_dev,
2651 "over-current change on port %d\n",
2652 i);
2653 clear_port_feature(hdev, i,
2654 USB_PORT_FEAT_C_OVER_CURRENT);
2655 hub_power_on(hub);
2656 }
2657
2658 if (portchange & USB_PORT_STAT_C_RESET) {
2659 dev_dbg (hub_dev,
2660 "reset change on port %d\n",
2661 i);
2662 clear_port_feature(hdev, i,
2663 USB_PORT_FEAT_C_RESET);
2664 }
2665
2666 if (connect_change)
2667 hub_port_connect_change(hub, i,
2668 portstatus, portchange);
2669 } /* end for i */
2670
2671 /* deal with hub status changes */
2672 if (test_and_clear_bit(0, hub->event_bits) == 0)
2673 ; /* do nothing */
2674 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2675 dev_err (hub_dev, "get_hub_status failed\n");
2676 else {
2677 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2678 dev_dbg (hub_dev, "power change\n");
2679 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2680 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2681 /* FIXME: Is this always true? */
2682 hub->limited_power = 0;
2683 else
2684 hub->limited_power = 1;
1da177e4
LT		 2685 }
2686 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2687 dev_dbg (hub_dev, "overcurrent change\n");
2688 msleep(500); /* Cool down */
2689 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2690 hub_power_on(hub);
2691 }
2692 }
2693
2694 hub->activating = 0;
2695
d5926ae7
AS		 2696 /* If this is a root hub, tell the HCD it's okay to
2697 * re-enable port-change interrupts now. */
2698 if (!hdev->parent)
2699 usb_enable_root_hub_irq(hdev->bus);
2700
1da177e4
LT		 2701loop:
2702 usb_unlock_device(hdev);
2703 usb_put_intf(intf);
2704
2705 } /* end while (1) */
2706}
2707
2708static int hub_thread(void *__unused)
2709{
1da177e4
LT		 2710 do {
2711 hub_events();
9c8d6178
AM		 2712 wait_event_interruptible(khubd_wait,
2713 !list_empty(&hub_event_list) ||
2714 kthread_should_stop());
3e1d1d28 2715 try_to_freeze();
9c8d6178 2716 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2717
9c8d6178
AM		 2718 pr_debug("%s: khubd exiting\n", usbcore_name);
2719 return 0;
1da177e4
LT		 2720}
2721
2722static struct usb_device_id hub_id_table [] = {
2723 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2724 .bDeviceClass = USB_CLASS_HUB},
2725 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2726 .bInterfaceClass = USB_CLASS_HUB},
2727 { } /* Terminating entry */
2728};
2729
2730MODULE_DEVICE_TABLE (usb, hub_id_table);
2731
2732static struct usb_driver hub_driver = {
1da177e4
LT		 2733 .name = "hub",
2734 .probe = hub_probe,
2735 .disconnect = hub_disconnect,
2736 .suspend = hub_suspend,
2737 .resume = hub_resume,
7de18d8b
AS		 2738 .pre_reset = hub_pre_reset,
2739 .post_reset = hub_post_reset,
1da177e4
LT		 2740 .ioctl = hub_ioctl,
2741 .id_table = hub_id_table,
2742};
2743
2744int usb_hub_init(void)
2745{
1da177e4
LT		 2746 if (usb_register(&hub_driver) < 0) {
2747 printk(KERN_ERR "%s: can't register hub driver\n",
2748 usbcore_name);
2749 return -1;
2750 }
2751
9c8d6178
AM		 2752 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2753 if (!IS_ERR(khubd_task))
1da177e4 2754 return 0;
1da177e4
LT		 2755
2756 /* Fall through if kernel_thread failed */
2757 usb_deregister(&hub_driver);
2758 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2759
2760 return -1;
2761}
2762
2763void usb_hub_cleanup(void)
2764{
9c8d6178 2765 kthread_stop(khubd_task);
1da177e4
LT		 2766
2767 /*
2768 * Hub resources are freed for us by usb_deregister. It calls
2769 * usb_driver_purge on every device which in turn calls that
2770 * devices disconnect function if it is using this driver.
2771 * The hub_disconnect function takes care of releasing the
2772 * individual hub resources. -greg
2773 */
2774 usb_deregister(&hub_driver);
2775} /* usb_hub_cleanup() */
2776
1da177e4
LT		 2777static int config_descriptors_changed(struct usb_device *udev)
2778{
2779 unsigned index;
2780 unsigned len = 0;
2781 struct usb_config_descriptor *buf;
2782
2783 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2784 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2785 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2786 }
2787 buf = kmalloc (len, SLAB_KERNEL);
2788 if (buf == NULL) {
2789 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2790 /* assume the worst */
2791 return 1;
2792 }
2793 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2794 int length;
2795 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2796
2797 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2798 old_length);
2799 if (length < old_length) {
2800 dev_dbg(&udev->dev, "config index %d, error %d\n",
2801 index, length);
2802 break;
2803 }
2804 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2805 != 0) {
2806 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2807 index, buf->bConfigurationValue);
2808 break;
2809 }
2810 }
2811 kfree(buf);
2812 return index != udev->descriptor.bNumConfigurations;
2813}
2814
2815/**
2816 * usb_reset_device - perform a USB port reset to reinitialize a device
2817 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2818 *
79efa097
AS		 2819 * WARNING - don't use this routine to reset a composite device
2820 * (one with multiple interfaces owned by separate drivers)!
2821 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2822 *
2823 * Do a port reset, reassign the device's address, and establish its
2824 * former operating configuration. If the reset fails, or the device's
2825 * descriptors change from their values before the reset, or the original
2826 * configuration and altsettings cannot be restored, a flag will be set
2827 * telling khubd to pretend the device has been disconnected and then
2828 * re-connected. All drivers will be unbound, and the device will be
2829 * re-enumerated and probed all over again.
2830 *
2831 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2832 * flagged for logical disconnection, or some other negative error code
2833 * if the reset wasn't even attempted.
2834 *
2835 * The caller must own the device lock. For example, it's safe to use
2836 * this from a driver probe() routine after downloading new firmware.
2837 * For calls that might not occur during probe(), drivers should lock
2838 * the device using usb_lock_device_for_reset().
2839 */
2840int usb_reset_device(struct usb_device *udev)
2841{
2842 struct usb_device *parent_hdev = udev->parent;
2843 struct usb_hub *parent_hub;
2844 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2845 int i, ret = 0;
2846 int port1 = udev->portnum;
1da177e4
LT		 2847
2848 if (udev->state == USB_STATE_NOTATTACHED ||
2849 udev->state == USB_STATE_SUSPENDED) {
2850 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2851 udev->state);
2852 return -EINVAL;
2853 }
2854
2855 if (!parent_hdev) {
2856 /* this requires hcd-specific logic; see OHCI hc_restart() */
2857 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2858 return -EISDIR;
2859 }
1da177e4
LT		 2860 parent_hub = hdev_to_hub(parent_hdev);
2861
1da177e4
LT		 2862 set_bit(port1, parent_hub->busy_bits);
2863 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2864
2865 /* ep0 maxpacket size may change; let the HCD know about it.
2866 * Other endpoints will be handled by re-enumeration. */
2867 ep0_reinit(udev);
2868 ret = hub_port_init(parent_hub, udev, port1, i);
2869 if (ret >= 0)
2870 break;
2871 }
2872 clear_bit(port1, parent_hub->busy_bits);
2873 if (ret < 0)
2874 goto re_enumerate;
2875
2876 /* Device might have changed firmware (DFU or similar) */
2877 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2878 || config_descriptors_changed (udev)) {
2879 dev_info(&udev->dev, "device firmware changed\n");
2880 udev->descriptor = descriptor; /* for disconnect() calls */
2881 goto re_enumerate;
2882 }
2883
2884 if (!udev->actconfig)
2885 goto done;
2886
2887 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2888 USB_REQ_SET_CONFIGURATION, 0,
2889 udev->actconfig->desc.bConfigurationValue, 0,
2890 NULL, 0, USB_CTRL_SET_TIMEOUT);
2891 if (ret < 0) {
2892 dev_err(&udev->dev,
2893 "can't restore configuration #%d (error=%d)\n",
2894 udev->actconfig->desc.bConfigurationValue, ret);
2895 goto re_enumerate;
2896 }
2897 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2898
2899 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
2900 struct usb_interface *intf = udev->actconfig->interface[i];
2901 struct usb_interface_descriptor *desc;
2902
2903 /* set_interface resets host side toggle even
2904 * for altsetting zero. the interface may have no driver.
2905 */
2906 desc = &intf->cur_altsetting->desc;
2907 ret = usb_set_interface(udev, desc->bInterfaceNumber,
2908 desc->bAlternateSetting);
2909 if (ret < 0) {
2910 dev_err(&udev->dev, "failed to restore interface %d "
2911 "altsetting %d (error=%d)\n",
2912 desc->bInterfaceNumber,
2913 desc->bAlternateSetting,
2914 ret);
2915 goto re_enumerate;
2916 }
2917 }
2918
2919done:
1da177e4
LT		 2920 return 0;
2921
2922re_enumerate:
2923 hub_port_logical_disconnect(parent_hub, port1);
2924 return -ENODEV;
2925}
140d8f68 2926EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 2927
2928/**
2929 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
2930 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2931 * @iface: interface bound to the driver making the request (optional)
2932 *
2933 * Warns all drivers bound to registered interfaces (using their pre_reset
2934 * method), performs the port reset, and then lets the drivers know that
2935 * the reset is over (using their post_reset method).
2936 *
2937 * Return value is the same as for usb_reset_device().
2938 *
2939 * The caller must own the device lock. For example, it's safe to use
2940 * this from a driver probe() routine after downloading new firmware.
2941 * For calls that might not occur during probe(), drivers should lock
2942 * the device using usb_lock_device_for_reset().
2943 *
2944 * The interface locks are acquired during the pre_reset stage and released
2945 * during the post_reset stage. However if iface is not NULL and is
2946 * currently being probed, we assume that the caller already owns its
2947 * lock.
2948 */
2949int usb_reset_composite_device(struct usb_device *udev,
2950 struct usb_interface *iface)
2951{
2952 int ret;
2953 struct usb_host_config *config = udev->actconfig;
2954
2955 if (udev->state == USB_STATE_NOTATTACHED ||
2956 udev->state == USB_STATE_SUSPENDED) {
2957 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2958 udev->state);
2959 return -EINVAL;
2960 }
2961
2962 if (iface && iface->condition != USB_INTERFACE_BINDING)
2963 iface = NULL;
2964
2965 if (config) {
2966 int i;
2967 struct usb_interface *cintf;
2968 struct usb_driver *drv;
2969
2970 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
2971 cintf = config->interface[i];
2972 if (cintf != iface)
2973 down(&cintf->dev.sem);
2974 if (device_is_registered(&cintf->dev) &&
2975 cintf->dev.driver) {
2976 drv = to_usb_driver(cintf->dev.driver);
2977 if (drv->pre_reset)
2978 (drv->pre_reset)(cintf);
2979 }
2980 }
2981 }
2982
2983 ret = usb_reset_device(udev);
2984
2985 if (config) {
2986 int i;
2987 struct usb_interface *cintf;
2988 struct usb_driver *drv;
2989
2990 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
2991 cintf = config->interface[i];
2992 if (device_is_registered(&cintf->dev) &&
2993 cintf->dev.driver) {
2994 drv = to_usb_driver(cintf->dev.driver);
2995 if (drv->post_reset)
2996 (drv->post_reset)(cintf);
2997 }
2998 if (cintf != iface)
2999 up(&cintf->dev.sem);
3000 }
3001 }
3002
3003 return ret;
3004}
140d8f68 3005EXPORT_SYMBOL(usb_reset_composite_device);
kernel source for telekom puls (alcatel/mediatek)