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USB: ehci-dbg: fix reading less content of periodic file
[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>
1da177e4
LT		 19#include <linux/ioctl.h>
20#include <linux/usb.h>
21#include <linux/usbdevice_fs.h>
9c8d6178 22#include <linux/kthread.h>
4186ecf8 23#include <linux/mutex.h>
7dfb7103 24#include <linux/freezer.h>
1da177e4 25
1da177e4
LT		 26#include <asm/uaccess.h>
27#include <asm/byteorder.h>
28
29#include "usb.h"
30#include "hcd.h"
31#include "hub.h"
32
f2a383e4
GKH		 33/* if we are in debug mode, always announce new devices */
34#ifdef DEBUG
35#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
36#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
37#endif
38#endif
39
1bb5f66b
AS		 40struct usb_hub {
41 struct device *intfdev; /* the "interface" device */
42 struct usb_device *hdev;
e8054854 43 struct kref kref;
1bb5f66b
AS		 44 struct urb *urb; /* for interrupt polling pipe */
45
46 /* buffer for urb ... with extra space in case of babble */
47 char (*buffer)[8];
48 dma_addr_t buffer_dma; /* DMA address for buffer */
49 union {
50 struct usb_hub_status hub;
51 struct usb_port_status port;
52 } *status; /* buffer for status reports */
db90e7a1 53 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS		 54
55 int error; /* last reported error */
56 int nerrors; /* track consecutive errors */
57
58 struct list_head event_list; /* hubs w/data or errs ready */
59 unsigned long event_bits[1]; /* status change bitmask */
60 unsigned long change_bits[1]; /* ports with logical connect
61 status change */
62 unsigned long busy_bits[1]; /* ports being reset or
63 resumed */
64#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65#error event_bits[] is too short!
66#endif
67
68 struct usb_hub_descriptor *descriptor; /* class descriptor */
69 struct usb_tt tt; /* Transaction Translator */
70
71 unsigned mA_per_port; /* current for each child */
72
73 unsigned limited_power:1;
74 unsigned quiescing:1;
e8054854 75 unsigned disconnected:1;
1bb5f66b
AS		 76
77 unsigned has_indicators:1;
78 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 79 struct delayed_work leds;
1bb5f66b
AS		 80};
81
82
1da177e4 83/* Protect struct usb_device->state and ->children members
9ad3d6cc 84 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 85 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
86static DEFINE_SPINLOCK(device_state_lock);
87
88/* khubd's worklist and its lock */
89static DEFINE_SPINLOCK(hub_event_lock);
90static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
91
92/* Wakes up khubd */
93static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
94
9c8d6178 95static struct task_struct *khubd_task;
1da177e4
LT		 96
97/* cycle leds on hubs that aren't blinking for attention */
98static int blinkenlights = 0;
99module_param (blinkenlights, bool, S_IRUGO);
100MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
101
102/*
103 * As of 2.6.10 we introduce a new USB device initialization scheme which
104 * closely resembles the way Windows works. Hopefully it will be compatible
105 * with a wider range of devices than the old scheme. However some previously
106 * working devices may start giving rise to "device not accepting address"
107 * errors; if that happens the user can try the old scheme by adjusting the
108 * following module parameters.
109 *
110 * For maximum flexibility there are two boolean parameters to control the
111 * hub driver's behavior. On the first initialization attempt, if the
112 * "old_scheme_first" parameter is set then the old scheme will be used,
113 * otherwise the new scheme is used. If that fails and "use_both_schemes"
114 * is set, then the driver will make another attempt, using the other scheme.
115 */
116static int old_scheme_first = 0;
117module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(old_scheme_first,
119 "start with the old device initialization scheme");
120
121static int use_both_schemes = 1;
122module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
123MODULE_PARM_DESC(use_both_schemes,
124 "try the other device initialization scheme if the "
125 "first one fails");
126
32fe0198
AS		 127/* Mutual exclusion for EHCI CF initialization. This interferes with
128 * port reset on some companion controllers.
129 */
130DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
131EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
132
948fea37
AS		 133#define HUB_DEBOUNCE_TIMEOUT 1500
134#define HUB_DEBOUNCE_STEP 25
135#define HUB_DEBOUNCE_STABLE 100
136
1da177e4 137
742120c6
ML		 138static int usb_reset_and_verify_device(struct usb_device *udev);
139
404d5b18 140static inline char *portspeed(int portstatus)
1da177e4
LT		 141{
142 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
143 return "480 Mb/s";
144 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
145 return "1.5 Mb/s";
146 else
147 return "12 Mb/s";
148}
1da177e4
LT		 149
150/* Note that hdev or one of its children must be locked! */
151static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
152{
153 return usb_get_intfdata(hdev->actconfig->interface[0]);
154}
155
156/* USB 2.0 spec Section 11.24.4.5 */
157static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
158{
159 int i, ret;
160
161 for (i = 0; i < 3; i++) {
162 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
163 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
164 USB_DT_HUB << 8, 0, data, size,
165 USB_CTRL_GET_TIMEOUT);
166 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
167 return ret;
168 }
169 return -EINVAL;
170}
171
172/*
173 * USB 2.0 spec Section 11.24.2.1
174 */
175static int clear_hub_feature(struct usb_device *hdev, int feature)
176{
177 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
178 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
179}
180
181/*
182 * USB 2.0 spec Section 11.24.2.2
183 */
184static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
185{
186 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
187 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
188 NULL, 0, 1000);
189}
190
191/*
192 * USB 2.0 spec Section 11.24.2.13
193 */
194static int set_port_feature(struct usb_device *hdev, int port1, int feature)
195{
196 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
197 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
198 NULL, 0, 1000);
199}
200
201/*
202 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
203 * for info about using port indicators
204 */
205static void set_port_led(
206 struct usb_hub *hub,
207 int port1,
208 int selector
209)
210{
211 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
212 USB_PORT_FEAT_INDICATOR);
213 if (status < 0)
214 dev_dbg (hub->intfdev,
215 "port %d indicator %s status %d\n",
216 port1,
217 ({ char *s; switch (selector) {
218 case HUB_LED_AMBER: s = "amber"; break;
219 case HUB_LED_GREEN: s = "green"; break;
220 case HUB_LED_OFF: s = "off"; break;
221 case HUB_LED_AUTO: s = "auto"; break;
222 default: s = "??"; break;
223 }; s; }),
224 status);
225}
226
227#define LED_CYCLE_PERIOD ((2*HZ)/3)
228
c4028958 229static void led_work (struct work_struct *work)
1da177e4 230{
c4028958
DH		 231 struct usb_hub *hub =
232 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 233 struct usb_device *hdev = hub->hdev;
234 unsigned i;
235 unsigned changed = 0;
236 int cursor = -1;
237
238 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
239 return;
240
241 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
242 unsigned selector, mode;
243
244 /* 30%-50% duty cycle */
245
246 switch (hub->indicator[i]) {
247 /* cycle marker */
248 case INDICATOR_CYCLE:
249 cursor = i;
250 selector = HUB_LED_AUTO;
251 mode = INDICATOR_AUTO;
252 break;
253 /* blinking green = sw attention */
254 case INDICATOR_GREEN_BLINK:
255 selector = HUB_LED_GREEN;
256 mode = INDICATOR_GREEN_BLINK_OFF;
257 break;
258 case INDICATOR_GREEN_BLINK_OFF:
259 selector = HUB_LED_OFF;
260 mode = INDICATOR_GREEN_BLINK;
261 break;
262 /* blinking amber = hw attention */
263 case INDICATOR_AMBER_BLINK:
264 selector = HUB_LED_AMBER;
265 mode = INDICATOR_AMBER_BLINK_OFF;
266 break;
267 case INDICATOR_AMBER_BLINK_OFF:
268 selector = HUB_LED_OFF;
269 mode = INDICATOR_AMBER_BLINK;
270 break;
271 /* blink green/amber = reserved */
272 case INDICATOR_ALT_BLINK:
273 selector = HUB_LED_GREEN;
274 mode = INDICATOR_ALT_BLINK_OFF;
275 break;
276 case INDICATOR_ALT_BLINK_OFF:
277 selector = HUB_LED_AMBER;
278 mode = INDICATOR_ALT_BLINK;
279 break;
280 default:
281 continue;
282 }
283 if (selector != HUB_LED_AUTO)
284 changed = 1;
285 set_port_led(hub, i + 1, selector);
286 hub->indicator[i] = mode;
287 }
288 if (!changed && blinkenlights) {
289 cursor++;
290 cursor %= hub->descriptor->bNbrPorts;
291 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
292 hub->indicator[cursor] = INDICATOR_CYCLE;
293 changed++;
294 }
295 if (changed)
296 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
297}
298
299/* use a short timeout for hub/port status fetches */
300#define USB_STS_TIMEOUT 1000
301#define USB_STS_RETRIES 5
302
303/*
304 * USB 2.0 spec Section 11.24.2.6
305 */
306static int get_hub_status(struct usb_device *hdev,
307 struct usb_hub_status *data)
308{
309 int i, status = -ETIMEDOUT;
310
311 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
312 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
313 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
314 data, sizeof(*data), USB_STS_TIMEOUT);
315 }
316 return status;
317}
318
319/*
320 * USB 2.0 spec Section 11.24.2.7
321 */
322static int get_port_status(struct usb_device *hdev, int port1,
323 struct usb_port_status *data)
324{
325 int i, status = -ETIMEDOUT;
326
327 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
328 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
329 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
330 data, sizeof(*data), USB_STS_TIMEOUT);
331 }
332 return status;
333}
334
3eb14915
AS		 335static int hub_port_status(struct usb_hub *hub, int port1,
336 u16 *status, u16 *change)
337{
338 int ret;
339
340 mutex_lock(&hub->status_mutex);
341 ret = get_port_status(hub->hdev, port1, &hub->status->port);
342 if (ret < 4) {
343 dev_err(hub->intfdev,
344 "%s failed (err = %d)\n", __func__, ret);
345 if (ret >= 0)
346 ret = -EIO;
347 } else {
348 *status = le16_to_cpu(hub->status->port.wPortStatus);
349 *change = le16_to_cpu(hub->status->port.wPortChange);
350 ret = 0;
351 }
352 mutex_unlock(&hub->status_mutex);
353 return ret;
354}
355
1da177e4
LT		 356static void kick_khubd(struct usb_hub *hub)
357{
358 unsigned long flags;
359
40f122f3
AS		 360 /* Suppress autosuspend until khubd runs */
361 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
362
1da177e4 363 spin_lock_irqsave(&hub_event_lock, flags);
2e2c5eea 364 if (!hub->disconnected && list_empty(&hub->event_list)) {
1da177e4
LT		 365 list_add_tail(&hub->event_list, &hub_event_list);
366 wake_up(&khubd_wait);
367 }
368 spin_unlock_irqrestore(&hub_event_lock, flags);
369}
370
371void usb_kick_khubd(struct usb_device *hdev)
372{
e8054854 373 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT		 374 kick_khubd(hdev_to_hub(hdev));
375}
376
377
378/* completion function, fires on port status changes and various faults */
7d12e780 379static void hub_irq(struct urb *urb)
1da177e4 380{
ec17cf1c 381 struct usb_hub *hub = urb->context;
e015268d 382 int status = urb->status;
1da177e4
LT		 383 int i;
384 unsigned long bits;
385
e015268d 386 switch (status) {
1da177e4
LT		 387 case -ENOENT: /* synchronous unlink */
388 case -ECONNRESET: /* async unlink */
389 case -ESHUTDOWN: /* hardware going away */
390 return;
391
392 default: /* presumably an error */
393 /* Cause a hub reset after 10 consecutive errors */
e015268d 394 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
1da177e4
LT		 395 if ((++hub->nerrors < 10) || hub->error)
396 goto resubmit;
e015268d 397 hub->error = status;
1da177e4 398 /* FALL THROUGH */
ec17cf1c 399
1da177e4
LT		 400 /* let khubd handle things */
401 case 0: /* we got data: port status changed */
402 bits = 0;
403 for (i = 0; i < urb->actual_length; ++i)
404 bits |= ((unsigned long) ((*hub->buffer)[i]))
405 << (i*8);
406 hub->event_bits[0] = bits;
407 break;
408 }
409
410 hub->nerrors = 0;
411
412 /* Something happened, let khubd figure it out */
413 kick_khubd(hub);
414
415resubmit:
416 if (hub->quiescing)
417 return;
418
419 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
420 && status != -ENODEV && status != -EPERM)
421 dev_err (hub->intfdev, "resubmit --> %d\n", status);
422}
423
424/* USB 2.0 spec Section 11.24.2.3 */
425static inline int
426hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
427{
428 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
429 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
430 tt, NULL, 0, 1000);
431}
432
433/*
434 * enumeration blocks khubd for a long time. we use keventd instead, since
435 * long blocking there is the exception, not the rule. accordingly, HCDs
436 * talking to TTs must queue control transfers (not just bulk and iso), so
437 * both can talk to the same hub concurrently.
438 */
c4028958 439static void hub_tt_kevent (struct work_struct *work)
1da177e4 440{
c4028958
DH		 441 struct usb_hub *hub =
442 container_of(work, struct usb_hub, tt.kevent);
1da177e4 443 unsigned long flags;
55e5fdfa 444 int limit = 100;
1da177e4
LT		 445
446 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 447 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT		 448 struct list_head *temp;
449 struct usb_tt_clear *clear;
450 struct usb_device *hdev = hub->hdev;
451 int status;
452
453 temp = hub->tt.clear_list.next;
454 clear = list_entry (temp, struct usb_tt_clear, clear_list);
455 list_del (&clear->clear_list);
456
457 /* drop lock so HCD can concurrently report other TT errors */
458 spin_unlock_irqrestore (&hub->tt.lock, flags);
459 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
460 spin_lock_irqsave (&hub->tt.lock, flags);
461
462 if (status)
463 dev_err (&hdev->dev,
464 "clear tt %d (%04x) error %d\n",
465 clear->tt, clear->devinfo, status);
1bc3c9e1 466 kfree(clear);
1da177e4
LT		 467 }
468 spin_unlock_irqrestore (&hub->tt.lock, flags);
469}
470
471/**
472 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
473 * @udev: the device whose split transaction failed
474 * @pipe: identifies the endpoint of the failed transaction
475 *
476 * High speed HCDs use this to tell the hub driver that some split control or
477 * bulk transaction failed in a way that requires clearing internal state of
478 * a transaction translator. This is normally detected (and reported) from
479 * interrupt context.
480 *
481 * It may not be possible for that hub to handle additional full (or low)
482 * speed transactions until that state is fully cleared out.
483 */
484void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
485{
486 struct usb_tt *tt = udev->tt;
487 unsigned long flags;
488 struct usb_tt_clear *clear;
489
490 /* we've got to cope with an arbitrary number of pending TT clears,
491 * since each TT has "at least two" buffers that can need it (and
492 * there can be many TTs per hub). even if they're uncommon.
493 */
54e6ecb2 494 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 495 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
496 /* FIXME recover somehow ... RESET_TT? */
497 return;
498 }
499
500 /* info that CLEAR_TT_BUFFER needs */
501 clear->tt = tt->multi ? udev->ttport : 1;
502 clear->devinfo = usb_pipeendpoint (pipe);
503 clear->devinfo |= udev->devnum << 4;
504 clear->devinfo |= usb_pipecontrol (pipe)
505 ? (USB_ENDPOINT_XFER_CONTROL << 11)
506 : (USB_ENDPOINT_XFER_BULK << 11);
507 if (usb_pipein (pipe))
508 clear->devinfo |= 1 << 15;
509
510 /* tell keventd to clear state for this TT */
511 spin_lock_irqsave (&tt->lock, flags);
512 list_add_tail (&clear->clear_list, &tt->clear_list);
513 schedule_work (&tt->kevent);
514 spin_unlock_irqrestore (&tt->lock, flags);
515}
782e70c6 516EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
1da177e4
LT		 517
518static void hub_power_on(struct usb_hub *hub)
519{
520 int port1;
b789696a 521 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 522 u16 wHubCharacteristics =
523 le16_to_cpu(hub->descriptor->wHubCharacteristics);
524
525 /* Enable power on each port. Some hubs have reserved values
526 * of LPSM (> 2) in their descriptors, even though they are
527 * USB 2.0 hubs. Some hubs do not implement port-power switching
528 * but only emulate it. In all cases, the ports won't work
529 * unless we send these messages to the hub.
530 */
531 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 532 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 533 else
534 dev_dbg(hub->intfdev, "trying to enable port power on "
535 "non-switchable hub\n");
536 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
537 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 538
b789696a
DB		 539 /* Wait at least 100 msec for power to become stable */
540 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 541}
542
1da177e4
LT		 543static int hub_hub_status(struct usb_hub *hub,
544 u16 *status, u16 *change)
545{
546 int ret;
547
db90e7a1 548 mutex_lock(&hub->status_mutex);
1da177e4
LT		 549 ret = get_hub_status(hub->hdev, &hub->status->hub);
550 if (ret < 0)
551 dev_err (hub->intfdev,
441b62c1 552 "%s failed (err = %d)\n", __func__, ret);
1da177e4
LT		 553 else {
554 *status = le16_to_cpu(hub->status->hub.wHubStatus);
555 *change = le16_to_cpu(hub->status->hub.wHubChange);
556 ret = 0;
557 }
db90e7a1 558 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 559 return ret;
560}
561
8b28c752
AS		 562static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
563{
564 struct usb_device *hdev = hub->hdev;
0458d5b4 565 int ret = 0;
8b28c752 566
0458d5b4 567 if (hdev->children[port1-1] && set_state)
8b28c752
AS		 568 usb_set_device_state(hdev->children[port1-1],
569 USB_STATE_NOTATTACHED);
0458d5b4
AS		 570 if (!hub->error)
571 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS		 572 if (ret)
573 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 574 port1, ret);
8b28c752
AS		 575 return ret;
576}
577
0458d5b4
AS		 578/*
579 * Disable a port and mark a logical connnect-change event, so that some
580 * time later khubd will disconnect() any existing usb_device on the port
581 * and will re-enumerate if there actually is a device attached.
582 */
583static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
584{
585 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
586 hub_port_disable(hub, port1, 1);
7d069b7d 587
0458d5b4
AS		 588 /* FIXME let caller ask to power down the port:
589 * - some devices won't enumerate without a VBUS power cycle
590 * - SRP saves power that way
591 * - ... new call, TBD ...
592 * That's easy if this hub can switch power per-port, and
593 * khubd reactivates the port later (timer, SRP, etc).
594 * Powerdown must be optional, because of reset/DFU.
595 */
596
597 set_bit(port1, hub->change_bits);
598 kick_khubd(hub);
599}
600
6ee0b270
AS		 601enum hub_activation_type {
602 HUB_INIT, HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME
603};
5e6effae 604
f2835219 605static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
5e6effae
AS		 606{
607 struct usb_device *hdev = hub->hdev;
608 int port1;
f2835219 609 int status;
948fea37 610 bool need_debounce_delay = false;
5e6effae 611
f2835219
AS		 612 /* After a resume, port power should still be on.
613 * For any other type of activation, turn it on.
614 */
615 if (type != HUB_RESUME)
616 hub_power_on(hub);
617
6ee0b270
AS		 618 /* Check each port and set hub->change_bits to let khubd know
619 * which ports need attention.
5e6effae
AS		 620 */
621 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
622 struct usb_device *udev = hdev->children[port1-1];
5e6effae
AS		 623 u16 portstatus, portchange;
624
6ee0b270
AS		 625 portstatus = portchange = 0;
626 status = hub_port_status(hub, port1, &portstatus, &portchange);
627 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
628 dev_dbg(hub->intfdev,
629 "port %d: status %04x change %04x\n",
630 port1, portstatus, portchange);
631
632 /* After anything other than HUB_RESUME (i.e., initialization
633 * or any sort of reset), every port should be disabled.
634 * Unconnected ports should likewise be disabled (paranoia),
635 * and so should ports for which we have no usb_device.
636 */
637 if ((portstatus & USB_PORT_STAT_ENABLE) && (
638 type != HUB_RESUME ||
639 !(portstatus & USB_PORT_STAT_CONNECTION) ||
640 !udev ||
641 udev->state == USB_STATE_NOTATTACHED)) {
642 clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
643 portstatus &= ~USB_PORT_STAT_ENABLE;
5e6effae
AS		 644 }
645
948fea37
AS		 646 /* Clear status-change flags; we'll debounce later */
647 if (portchange & USB_PORT_STAT_C_CONNECTION) {
648 need_debounce_delay = true;
649 clear_port_feature(hub->hdev, port1,
650 USB_PORT_FEAT_C_CONNECTION);
651 }
652 if (portchange & USB_PORT_STAT_C_ENABLE) {
653 need_debounce_delay = true;
654 clear_port_feature(hub->hdev, port1,
655 USB_PORT_FEAT_C_ENABLE);
656 }
657
6ee0b270
AS		 658 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
659 /* Tell khubd to disconnect the device or
660 * check for a new connection
661 */
662 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
663 set_bit(port1, hub->change_bits);
664
665 } else if (portstatus & USB_PORT_STAT_ENABLE) {
666 /* The power session apparently survived the resume.
667 * If there was an overcurrent or suspend change
668 * (i.e., remote wakeup request), have khubd
669 * take care of it.
670 */
671 if (portchange)
672 set_bit(port1, hub->change_bits);
5e6effae 673
6ee0b270 674 } else if (udev->persist_enabled) {
6ee0b270 675#ifdef CONFIG_PM
5e6effae 676 udev->reset_resume = 1;
6ee0b270 677#endif
8808f00c
AS		 678 set_bit(port1, hub->change_bits);
679
6ee0b270
AS		 680 } else {
681 /* The power session is gone; tell khubd */
682 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
683 set_bit(port1, hub->change_bits);
5e6effae 684 }
5e6effae
AS		 685 }
686
948fea37
AS		 687 /* If no port-status-change flags were set, we don't need any
688 * debouncing. If flags were set we can try to debounce the
689 * ports all at once right now, instead of letting khubd do them
690 * one at a time later on.
691 *
692 * If any port-status changes do occur during this delay, khubd
693 * will see them later and handle them normally.
694 */
695 if (need_debounce_delay)
696 msleep(HUB_DEBOUNCE_STABLE);
f2835219
AS		 697
698 hub->quiescing = 0;
699
700 status = usb_submit_urb(hub->urb, GFP_NOIO);
701 if (status < 0)
702 dev_err(hub->intfdev, "activate --> %d\n", status);
703 if (hub->has_indicators && blinkenlights)
704 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
705
706 /* Scan all ports that need attention */
707 kick_khubd(hub);
5e6effae
AS		 708}
709
4330354f
AS		 710enum hub_quiescing_type {
711 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
712};
713
714static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
715{
716 struct usb_device *hdev = hub->hdev;
717 int i;
718
719 /* khubd and related activity won't re-trigger */
720 hub->quiescing = 1;
721
722 if (type != HUB_SUSPEND) {
723 /* Disconnect all the children */
724 for (i = 0; i < hdev->maxchild; ++i) {
725 if (hdev->children[i])
726 usb_disconnect(&hdev->children[i]);
727 }
728 }
729
730 /* Stop khubd and related activity */
731 usb_kill_urb(hub->urb);
732 if (hub->has_indicators)
733 cancel_delayed_work_sync(&hub->leds);
734 if (hub->tt.hub)
735 cancel_work_sync(&hub->tt.kevent);
736}
737
3eb14915
AS		 738/* caller has locked the hub device */
739static int hub_pre_reset(struct usb_interface *intf)
740{
741 struct usb_hub *hub = usb_get_intfdata(intf);
742
4330354f 743 hub_quiesce(hub, HUB_PRE_RESET);
f07600cf 744 return 0;
7d069b7d
AS		 745}
746
747/* caller has locked the hub device */
f07600cf 748static int hub_post_reset(struct usb_interface *intf)
7d069b7d 749{
7de18d8b
AS		 750 struct usb_hub *hub = usb_get_intfdata(intf);
751
f2835219 752 hub_activate(hub, HUB_POST_RESET);
f07600cf 753 return 0;
7d069b7d
AS		 754}
755
1da177e4
LT		 756static int hub_configure(struct usb_hub *hub,
757 struct usb_endpoint_descriptor *endpoint)
758{
759 struct usb_device *hdev = hub->hdev;
760 struct device *hub_dev = hub->intfdev;
761 u16 hubstatus, hubchange;
74ad9bd2 762 u16 wHubCharacteristics;
1da177e4
LT		 763 unsigned int pipe;
764 int maxp, ret;
765 char *message;
766
767 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
768 &hub->buffer_dma);
769 if (!hub->buffer) {
770 message = "can't allocate hub irq buffer";
771 ret = -ENOMEM;
772 goto fail;
773 }
774
775 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
776 if (!hub->status) {
777 message = "can't kmalloc hub status buffer";
778 ret = -ENOMEM;
779 goto fail;
780 }
db90e7a1 781 mutex_init(&hub->status_mutex);
1da177e4
LT		 782
783 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
784 if (!hub->descriptor) {
785 message = "can't kmalloc hub descriptor";
786 ret = -ENOMEM;
787 goto fail;
788 }
789
790 /* Request the entire hub descriptor.
791 * hub->descriptor can handle USB_MAXCHILDREN ports,
792 * but the hub can/will return fewer bytes here.
793 */
794 ret = get_hub_descriptor(hdev, hub->descriptor,
795 sizeof(*hub->descriptor));
796 if (ret < 0) {
797 message = "can't read hub descriptor";
798 goto fail;
799 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
800 message = "hub has too many ports!";
801 ret = -ENODEV;
802 goto fail;
803 }
804
805 hdev->maxchild = hub->descriptor->bNbrPorts;
806 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
807 (hdev->maxchild == 1) ? "" : "s");
808
74ad9bd2 809 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 810
74ad9bd2 811 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 812 int i;
813 char portstr [USB_MAXCHILDREN + 1];
814
815 for (i = 0; i < hdev->maxchild; i++)
816 portstr[i] = hub->descriptor->DeviceRemovable
817 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
818 ? 'F' : 'R';
819 portstr[hdev->maxchild] = 0;
820 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
821 } else
822 dev_dbg(hub_dev, "standalone hub\n");
823
74ad9bd2 824 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 825 case 0x00:
826 dev_dbg(hub_dev, "ganged power switching\n");
827 break;
828 case 0x01:
829 dev_dbg(hub_dev, "individual port power switching\n");
830 break;
831 case 0x02:
832 case 0x03:
833 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
834 break;
835 }
836
74ad9bd2 837 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 838 case 0x00:
839 dev_dbg(hub_dev, "global over-current protection\n");
840 break;
841 case 0x08:
842 dev_dbg(hub_dev, "individual port over-current protection\n");
843 break;
844 case 0x10:
845 case 0x18:
846 dev_dbg(hub_dev, "no over-current protection\n");
847 break;
848 }
849
850 spin_lock_init (&hub->tt.lock);
851 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 852 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 853 switch (hdev->descriptor.bDeviceProtocol) {
854 case 0:
855 break;
856 case 1:
857 dev_dbg(hub_dev, "Single TT\n");
858 hub->tt.hub = hdev;
859 break;
860 case 2:
861 ret = usb_set_interface(hdev, 0, 1);
862 if (ret == 0) {
863 dev_dbg(hub_dev, "TT per port\n");
864 hub->tt.multi = 1;
865 } else
866 dev_err(hub_dev, "Using single TT (err %d)\n",
867 ret);
868 hub->tt.hub = hdev;
869 break;
870 default:
871 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
872 hdev->descriptor.bDeviceProtocol);
873 break;
874 }
875
e09711ae 876 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 877 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 878 case HUB_TTTT_8_BITS:
879 if (hdev->descriptor.bDeviceProtocol != 0) {
880 hub->tt.think_time = 666;
881 dev_dbg(hub_dev, "TT requires at most %d "
882 "FS bit times (%d ns)\n",
883 8, hub->tt.think_time);
884 }
1da177e4 885 break;
e09711ae
DB		 886 case HUB_TTTT_16_BITS:
887 hub->tt.think_time = 666 * 2;
888 dev_dbg(hub_dev, "TT requires at most %d "
889 "FS bit times (%d ns)\n",
890 16, hub->tt.think_time);
1da177e4 891 break;
e09711ae
DB		 892 case HUB_TTTT_24_BITS:
893 hub->tt.think_time = 666 * 3;
894 dev_dbg(hub_dev, "TT requires at most %d "
895 "FS bit times (%d ns)\n",
896 24, hub->tt.think_time);
1da177e4 897 break;
e09711ae
DB		 898 case HUB_TTTT_32_BITS:
899 hub->tt.think_time = 666 * 4;
900 dev_dbg(hub_dev, "TT requires at most %d "
901 "FS bit times (%d ns)\n",
902 32, hub->tt.think_time);
1da177e4
LT		 903 break;
904 }
905
906 /* probe() zeroes hub->indicator[] */
74ad9bd2 907 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 908 hub->has_indicators = 1;
909 dev_dbg(hub_dev, "Port indicators are supported\n");
910 }
911
912 dev_dbg(hub_dev, "power on to power good time: %dms\n",
913 hub->descriptor->bPwrOn2PwrGood * 2);
914
915 /* power budgeting mostly matters with bus-powered hubs,
916 * and battery-powered root hubs (may provide just 8 mA).
917 */
918 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 919 if (ret < 2) {
1da177e4
LT		 920 message = "can't get hub status";
921 goto fail;
922 }
7d35b929
AS		 923 le16_to_cpus(&hubstatus);
924 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 925 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
926 hub->mA_per_port = 500;
927 else {
928 hub->mA_per_port = hdev->bus_mA;
929 hub->limited_power = 1;
930 }
7d35b929 931 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 932 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
933 hub->descriptor->bHubContrCurrent);
55c52718
AS		 934 hub->limited_power = 1;
935 if (hdev->maxchild > 0) {
936 int remaining = hdev->bus_mA -
937 hub->descriptor->bHubContrCurrent;
938
939 if (remaining < hdev->maxchild * 100)
940 dev_warn(hub_dev,
941 "insufficient power available "
942 "to use all downstream ports\n");
943 hub->mA_per_port = 100; /* 7.2.1.1 */
944 }
945 } else { /* Self-powered external hub */
946 /* FIXME: What about battery-powered external hubs that
947 * provide less current per port? */
948 hub->mA_per_port = 500;
7d35b929 949 }
55c52718
AS		 950 if (hub->mA_per_port < 500)
951 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
952 hub->mA_per_port);
1da177e4
LT		 953
954 ret = hub_hub_status(hub, &hubstatus, &hubchange);
955 if (ret < 0) {
956 message = "can't get hub status";
957 goto fail;
958 }
959
960 /* local power status reports aren't always correct */
961 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
962 dev_dbg(hub_dev, "local power source is %s\n",
963 (hubstatus & HUB_STATUS_LOCAL_POWER)
964 ? "lost (inactive)" : "good");
965
74ad9bd2 966 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 967 dev_dbg(hub_dev, "%sover-current condition exists\n",
968 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
969
88fafff9 970 /* set up the interrupt endpoint
971 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
972 * bytes as USB2.0[11.12.3] says because some hubs are known
973 * to send more data (and thus cause overflow). For root hubs,
974 * maxpktsize is defined in hcd.c's fake endpoint descriptors
975 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 976 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
977 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
978
979 if (maxp > sizeof(*hub->buffer))
980 maxp = sizeof(*hub->buffer);
981
982 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
983 if (!hub->urb) {
984 message = "couldn't allocate interrupt urb";
985 ret = -ENOMEM;
986 goto fail;
987 }
988
989 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
990 hub, endpoint->bInterval);
991 hub->urb->transfer_dma = hub->buffer_dma;
992 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
993
994 /* maybe cycle the hub leds */
995 if (hub->has_indicators && blinkenlights)
996 hub->indicator [0] = INDICATOR_CYCLE;
997
f2835219 998 hub_activate(hub, HUB_INIT);
1da177e4
LT		 999 return 0;
1000
1001fail:
1002 dev_err (hub_dev, "config failed, %s (err %d)\n",
1003 message, ret);
1004 /* hub_disconnect() frees urb and descriptor */
1005 return ret;
1006}
1007
e8054854
AS		 1008static void hub_release(struct kref *kref)
1009{
1010 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1011
1012 usb_put_intf(to_usb_interface(hub->intfdev));
1013 kfree(hub);
1014}
1015
1da177e4
LT		 1016static unsigned highspeed_hubs;
1017
1018static void hub_disconnect(struct usb_interface *intf)
1019{
1020 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS		 1021
1022 /* Take the hub off the event list and don't let it be added again */
1023 spin_lock_irq(&hub_event_lock);
1024 list_del_init(&hub->event_list);
1025 hub->disconnected = 1;
1026 spin_unlock_irq(&hub_event_lock);
1da177e4 1027
7de18d8b
AS		 1028 /* Disconnect all children and quiesce the hub */
1029 hub->error = 0;
4330354f 1030 hub_quiesce(hub, HUB_DISCONNECT);
7de18d8b 1031
8b28c752 1032 usb_set_intfdata (intf, NULL);
1da177e4 1033
e8054854 1034 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT		 1035 highspeed_hubs--;
1036
1da177e4 1037 usb_free_urb(hub->urb);
1bc3c9e1 1038 kfree(hub->descriptor);
1bc3c9e1 1039 kfree(hub->status);
e8054854
AS		 1040 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
1041 hub->buffer_dma);
1da177e4 1042
e8054854 1043 kref_put(&hub->kref, hub_release);
1da177e4
LT		 1044}
1045
1046static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1047{
1048 struct usb_host_interface *desc;
1049 struct usb_endpoint_descriptor *endpoint;
1050 struct usb_device *hdev;
1051 struct usb_hub *hub;
1052
1053 desc = intf->cur_altsetting;
1054 hdev = interface_to_usbdev(intf);
1055
38f3ad5e
FB		 1056 if (hdev->level == MAX_TOPO_LEVEL) {
1057 dev_err(&intf->dev, "Unsupported bus topology: "
1058 "hub nested too deep\n");
1059 return -E2BIG;
1060 }
1061
89ccbdc9
DB		 1062#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1063 if (hdev->parent) {
1064 dev_warn(&intf->dev, "ignoring external hub\n");
1065 return -ENODEV;
1066 }
1067#endif
1068
1da177e4
LT		 1069 /* Some hubs have a subclass of 1, which AFAICT according to the */
1070 /* specs is not defined, but it works */
1071 if ((desc->desc.bInterfaceSubClass != 0) &&
1072 (desc->desc.bInterfaceSubClass != 1)) {
1073descriptor_error:
1074 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1075 return -EIO;
1076 }
1077
1078 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1079 if (desc->desc.bNumEndpoints != 1)
1080 goto descriptor_error;
1081
1082 endpoint = &desc->endpoint[0].desc;
1083
fbf81c29
LFC		 1084 /* If it's not an interrupt in endpoint, we'd better punt! */
1085 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 1086 goto descriptor_error;
1087
1088 /* We found a hub */
1089 dev_info (&intf->dev, "USB hub found\n");
1090
0a1ef3b5 1091 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 1092 if (!hub) {
1093 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1094 return -ENOMEM;
1095 }
1096
e8054854 1097 kref_init(&hub->kref);
1da177e4
LT		 1098 INIT_LIST_HEAD(&hub->event_list);
1099 hub->intfdev = &intf->dev;
1100 hub->hdev = hdev;
c4028958 1101 INIT_DELAYED_WORK(&hub->leds, led_work);
e8054854 1102 usb_get_intf(intf);
1da177e4
LT		 1103
1104 usb_set_intfdata (intf, hub);
40f122f3 1105 intf->needs_remote_wakeup = 1;
1da177e4
LT		 1106
1107 if (hdev->speed == USB_SPEED_HIGH)
1108 highspeed_hubs++;
1109
1110 if (hub_configure(hub, endpoint) >= 0)
1111 return 0;
1112
1113 hub_disconnect (intf);
1114 return -ENODEV;
1115}
1116
1117static int
1118hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1119{
1120 struct usb_device *hdev = interface_to_usbdev (intf);
1121
1122 /* assert ifno == 0 (part of hub spec) */
1123 switch (code) {
1124 case USBDEVFS_HUB_PORTINFO: {
1125 struct usbdevfs_hub_portinfo *info = user_data;
1126 int i;
1127
1128 spin_lock_irq(&device_state_lock);
1129 if (hdev->devnum <= 0)
1130 info->nports = 0;
1131 else {
1132 info->nports = hdev->maxchild;
1133 for (i = 0; i < info->nports; i++) {
1134 if (hdev->children[i] == NULL)
1135 info->port[i] = 0;
1136 else
1137 info->port[i] =
1138 hdev->children[i]->devnum;
1139 }
1140 }
1141 spin_unlock_irq(&device_state_lock);
1142
1143 return info->nports + 1;
1144 }
1145
1146 default:
1147 return -ENOSYS;
1148 }
1149}
1150
1da177e4 1151
1da177e4
LT		 1152static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1153{
1154 int i;
1155
1156 for (i = 0; i < udev->maxchild; ++i) {
1157 if (udev->children[i])
1158 recursively_mark_NOTATTACHED(udev->children[i]);
1159 }
15123006 1160 if (udev->state == USB_STATE_SUSPENDED) {
ee49fb5d 1161 udev->discon_suspended = 1;
15123006
SS		 1162 udev->active_duration -= jiffies;
1163 }
1da177e4
LT		 1164 udev->state = USB_STATE_NOTATTACHED;
1165}
1166
1167/**
1168 * usb_set_device_state - change a device's current state (usbcore, hcds)
1169 * @udev: pointer to device whose state should be changed
1170 * @new_state: new state value to be stored
1171 *
1172 * udev->state is _not_ fully protected by the device lock. Although
1173 * most transitions are made only while holding the lock, the state can
1174 * can change to USB_STATE_NOTATTACHED at almost any time. This
1175 * is so that devices can be marked as disconnected as soon as possible,
1176 * without having to wait for any semaphores to be released. As a result,
1177 * all changes to any device's state must be protected by the
1178 * device_state_lock spinlock.
1179 *
1180 * Once a device has been added to the device tree, all changes to its state
1181 * should be made using this routine. The state should _not_ be set directly.
1182 *
1183 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1184 * Otherwise udev->state is set to new_state, and if new_state is
1185 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1186 * to USB_STATE_NOTATTACHED.
1187 */
1188void usb_set_device_state(struct usb_device *udev,
1189 enum usb_device_state new_state)
1190{
1191 unsigned long flags;
1192
1193 spin_lock_irqsave(&device_state_lock, flags);
1194 if (udev->state == USB_STATE_NOTATTACHED)
1195 ; /* do nothing */
b94dc6b5 1196 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1197
1198 /* root hub wakeup capabilities are managed out-of-band
1199 * and may involve silicon errata ... ignore them here.
1200 */
1201 if (udev->parent) {
645daaab
AS		 1202 if (udev->state == USB_STATE_SUSPENDED
1203 || new_state == USB_STATE_SUSPENDED)
1204 ; /* No change to wakeup settings */
1205 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1206 device_init_wakeup(&udev->dev,
1207 (udev->actconfig->desc.bmAttributes
1208 & USB_CONFIG_ATT_WAKEUP));
645daaab 1209 else
fb669cc0
DB		 1210 device_init_wakeup(&udev->dev, 0);
1211 }
15123006
SS		 1212 if (udev->state == USB_STATE_SUSPENDED &&
1213 new_state != USB_STATE_SUSPENDED)
1214 udev->active_duration -= jiffies;
1215 else if (new_state == USB_STATE_SUSPENDED &&
1216 udev->state != USB_STATE_SUSPENDED)
1217 udev->active_duration += jiffies;
645daaab 1218 udev->state = new_state;
b94dc6b5 1219 } else
1da177e4
LT		 1220 recursively_mark_NOTATTACHED(udev);
1221 spin_unlock_irqrestore(&device_state_lock, flags);
1222}
1da177e4 1223
8af548dc
IPG		 1224/*
1225 * WUSB devices are simple: they have no hubs behind, so the mapping
1226 * device <-> virtual port number becomes 1:1. Why? to simplify the
1227 * life of the device connection logic in
1228 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1229 * handshake we need to assign a temporary address in the unauthorized
1230 * space. For simplicity we use the first virtual port number found to
1231 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1232 * and that becomes it's address [X < 128] or its unauthorized address
1233 * [X | 0x80].
1234 *
1235 * We add 1 as an offset to the one-based USB-stack port number
1236 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1237 * 0 is reserved by USB for default address; (b) Linux's USB stack
1238 * uses always #1 for the root hub of the controller. So USB stack's
1239 * port #1, which is wusb virtual-port #0 has address #2.
1240 */
1da177e4
LT		 1241static void choose_address(struct usb_device *udev)
1242{
1243 int devnum;
1244 struct usb_bus *bus = udev->bus;
1245
1246 /* If khubd ever becomes multithreaded, this will need a lock */
8af548dc
IPG		 1247 if (udev->wusb) {
1248 devnum = udev->portnum + 1;
1249 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1250 } else {
1251 /* Try to allocate the next devnum beginning at
1252 * bus->devnum_next. */
1253 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1254 bus->devnum_next);
1255 if (devnum >= 128)
1256 devnum = find_next_zero_bit(bus->devmap.devicemap,
1257 128, 1);
1258 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1259 }
1da177e4
LT		 1260 if (devnum < 128) {
1261 set_bit(devnum, bus->devmap.devicemap);
1262 udev->devnum = devnum;
1263 }
1264}
1265
1266static void release_address(struct usb_device *udev)
1267{
1268 if (udev->devnum > 0) {
1269 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1270 udev->devnum = -1;
1271 }
1272}
1273
4953d141
DV		 1274static void update_address(struct usb_device *udev, int devnum)
1275{
1276 /* The address for a WUSB device is managed by wusbcore. */
1277 if (!udev->wusb)
1278 udev->devnum = devnum;
1279}
1280
d5d4db70
AS		 1281#ifdef CONFIG_USB_SUSPEND
1282
1283static void usb_stop_pm(struct usb_device *udev)
1284{
1285 /* Synchronize with the ksuspend thread to prevent any more
1286 * autosuspend requests from being submitted, and decrement
1287 * the parent's count of unsuspended children.
1288 */
1289 usb_pm_lock(udev);
1290 if (udev->parent && !udev->discon_suspended)
1291 usb_autosuspend_device(udev->parent);
1292 usb_pm_unlock(udev);
1293
1294 /* Stop any autosuspend requests already submitted */
1295 cancel_rearming_delayed_work(&udev->autosuspend);
1296}
1297
1298#else
1299
1300static inline void usb_stop_pm(struct usb_device *udev)
1301{ }
1302
1303#endif
1304
1da177e4
LT		 1305/**
1306 * usb_disconnect - disconnect a device (usbcore-internal)
1307 * @pdev: pointer to device being disconnected
1308 * Context: !in_interrupt ()
1309 *
1310 * Something got disconnected. Get rid of it and all of its children.
1311 *
1312 * If *pdev is a normal device then the parent hub must already be locked.
1313 * If *pdev is a root hub then this routine will acquire the
1314 * usb_bus_list_lock on behalf of the caller.
1315 *
1316 * Only hub drivers (including virtual root hub drivers for host
1317 * controllers) should ever call this.
1318 *
1319 * This call is synchronous, and may not be used in an interrupt context.
1320 */
1321void usb_disconnect(struct usb_device **pdev)
1322{
1323 struct usb_device *udev = *pdev;
1324 int i;
1325
1326 if (!udev) {
441b62c1 1327 pr_debug ("%s nodev\n", __func__);
1da177e4
LT		 1328 return;
1329 }
1330
1331 /* mark the device as inactive, so any further urb submissions for
1332 * this device (and any of its children) will fail immediately.
1333 * this quiesces everyting except pending urbs.
1334 */
1335 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1336 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1337
9ad3d6cc
AS		 1338 usb_lock_device(udev);
1339
1da177e4
LT		 1340 /* Free up all the children before we remove this device */
1341 for (i = 0; i < USB_MAXCHILDREN; i++) {
1342 if (udev->children[i])
1343 usb_disconnect(&udev->children[i]);
1344 }
1345
1346 /* deallocate hcd/hardware state ... nuking all pending urbs and
1347 * cleaning up all state associated with the current configuration
1348 * so that the hardware is now fully quiesced.
1349 */
782da727 1350 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1351 usb_disable_device(udev, 0);
1352
782da727
AS		 1353 usb_unlock_device(udev);
1354
e16362a0
AS		 1355 /* Remove the device-specific files from sysfs. This must be
1356 * done with udev unlocked, because some of the attribute
1357 * routines try to acquire the device lock.
1358 */
1359 usb_remove_sysfs_dev_files(udev);
1360
782da727
AS		 1361 /* Unregister the device. The device driver is responsible
1362 * for removing the device files from usbfs and sysfs and for
1363 * de-configuring the device.
1364 */
1365 device_del(&udev->dev);
3099e75a 1366
782da727 1367 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1368 * (or root_hub) pointer.
1369 */
1da177e4 1370 release_address(udev);
1da177e4
LT		 1371
1372 /* Avoid races with recursively_mark_NOTATTACHED() */
1373 spin_lock_irq(&device_state_lock);
1374 *pdev = NULL;
1375 spin_unlock_irq(&device_state_lock);
1376
d5d4db70 1377 usb_stop_pm(udev);
ee49fb5d 1378
782da727 1379 put_device(&udev->dev);
1da177e4
LT		 1380}
1381
f2a383e4 1382#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1da177e4
LT		 1383static void show_string(struct usb_device *udev, char *id, char *string)
1384{
1385 if (!string)
1386 return;
1387 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1388}
1389
f2a383e4
GKH		 1390static void announce_device(struct usb_device *udev)
1391{
1392 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1393 le16_to_cpu(udev->descriptor.idVendor),
1394 le16_to_cpu(udev->descriptor.idProduct));
1395 dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, "
1396 "SerialNumber=%d\n",
1397 udev->descriptor.iManufacturer,
1398 udev->descriptor.iProduct,
1399 udev->descriptor.iSerialNumber);
1400 show_string(udev, "Product", udev->product);
1401 show_string(udev, "Manufacturer", udev->manufacturer);
1402 show_string(udev, "SerialNumber", udev->serial);
1403}
1da177e4 1404#else
f2a383e4 1405static inline void announce_device(struct usb_device *udev) { }
1da177e4
LT		 1406#endif
1407
1da177e4
LT		 1408#ifdef CONFIG_USB_OTG
1409#include "otg_whitelist.h"
1410#endif
1411
3ede760f 1412/**
d9d16e8a 1413 * usb_configure_device_otg - FIXME (usbcore-internal)
3ede760f
ON		 1414 * @udev: newly addressed device (in ADDRESS state)
1415 *
d9d16e8a 1416 * Do configuration for On-The-Go devices
3ede760f 1417 */
d9d16e8a 1418static int usb_configure_device_otg(struct usb_device *udev)
1da177e4 1419{
d9d16e8a 1420 int err = 0;
1da177e4
LT		 1421
1422#ifdef CONFIG_USB_OTG
1423 /*
1424 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1425 * to wake us after we've powered off VBUS; and HNP, switching roles
1426 * "host" to "peripheral". The OTG descriptor helps figure this out.
1427 */
1428 if (!udev->bus->is_b_host
1429 && udev->config
1430 && udev->parent == udev->bus->root_hub) {
1431 struct usb_otg_descriptor *desc = 0;
1432 struct usb_bus *bus = udev->bus;
1433
1434 /* descriptor may appear anywhere in config */
1435 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1436 le16_to_cpu(udev->config[0].desc.wTotalLength),
1437 USB_DT_OTG, (void **) &desc) == 0) {
1438 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1439 unsigned port1 = udev->portnum;
fc849b85 1440
1da177e4
LT		 1441 dev_info(&udev->dev,
1442 "Dual-Role OTG device on %sHNP port\n",
1443 (port1 == bus->otg_port)
1444 ? "" : "non-");
1445
1446 /* enable HNP before suspend, it's simpler */
1447 if (port1 == bus->otg_port)
1448 bus->b_hnp_enable = 1;
1449 err = usb_control_msg(udev,
1450 usb_sndctrlpipe(udev, 0),
1451 USB_REQ_SET_FEATURE, 0,
1452 bus->b_hnp_enable
1453 ? USB_DEVICE_B_HNP_ENABLE
1454 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1455 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1456 if (err < 0) {
1457 /* OTG MESSAGE: report errors here,
1458 * customize to match your product.
1459 */
1460 dev_info(&udev->dev,
1461 "can't set HNP mode; %d\n",
1462 err);
1463 bus->b_hnp_enable = 0;
1464 }
1465 }
1466 }
1467 }
1468
1469 if (!is_targeted(udev)) {
1470
1471 /* Maybe it can talk to us, though we can't talk to it.
1472 * (Includes HNP test device.)
1473 */
1474 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
4956eccd 1475 err = usb_port_suspend(udev);
1da177e4
LT		 1476 if (err < 0)
1477 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1478 }
ffcdc18d 1479 err = -ENOTSUPP;
1da177e4
LT		 1480 goto fail;
1481 }
d9d16e8a 1482fail:
1da177e4 1483#endif
d9d16e8a
IPG		 1484 return err;
1485}
1486
1487
1488/**
1489 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1490 * @udev: newly addressed device (in ADDRESS state)
1491 *
1492 * This is only called by usb_new_device() and usb_authorize_device()
1493 * and FIXME -- all comments that apply to them apply here wrt to
1494 * environment.
1495 *
1496 * If the device is WUSB and not authorized, we don't attempt to read
1497 * the string descriptors, as they will be errored out by the device
1498 * until it has been authorized.
1499 */
1500static int usb_configure_device(struct usb_device *udev)
1501{
1502 int err;
1da177e4 1503
d9d16e8a
IPG		 1504 if (udev->config == NULL) {
1505 err = usb_get_configuration(udev);
1506 if (err < 0) {
1507 dev_err(&udev->dev, "can't read configurations, error %d\n",
1508 err);
1509 goto fail;
1510 }
1511 }
1512 if (udev->wusb == 1 && udev->authorized == 0) {
1513 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1514 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1515 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1516 }
1517 else {
1518 /* read the standard strings and cache them if present */
1519 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1520 udev->manufacturer = usb_cache_string(udev,
1521 udev->descriptor.iManufacturer);
1522 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1523 }
1524 err = usb_configure_device_otg(udev);
1525fail:
1526 return err;
1527}
1528
1529
1530/**
1531 * usb_new_device - perform initial device setup (usbcore-internal)
1532 * @udev: newly addressed device (in ADDRESS state)
1533 *
1534 * This is called with devices which have been enumerated, but not yet
1535 * configured. The device descriptor is available, but not descriptors
1536 * for any device configuration. The caller must have locked either
1537 * the parent hub (if udev is a normal device) or else the
1538 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1539 * udev has already been installed, but udev is not yet visible through
1540 * sysfs or other filesystem code.
1541 *
1542 * It will return if the device is configured properly or not. Zero if
1543 * the interface was registered with the driver core; else a negative
1544 * errno value.
1545 *
1546 * This call is synchronous, and may not be used in an interrupt context.
1547 *
1548 * Only the hub driver or root-hub registrar should ever call this.
1549 */
1550int usb_new_device(struct usb_device *udev)
1551{
1552 int err;
1553
1554 usb_detect_quirks(udev); /* Determine quirks */
1555 err = usb_configure_device(udev); /* detect & probe dev/intfs */
1556 if (err < 0)
1557 goto fail;
9f8b17e6
KS		 1558 /* export the usbdev device-node for libusb */
1559 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1560 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1561
195af2cc
AS		 1562 /* Increment the parent's count of unsuspended children */
1563 if (udev->parent)
1564 usb_autoresume_device(udev->parent);
1565
782da727 1566 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1567 * for adding the device files to sysfs and for configuring
1568 * the device.
782da727 1569 */
9f8b17e6 1570 err = device_add(&udev->dev);
1da177e4
LT		 1571 if (err) {
1572 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1573 goto fail;
1574 }
9ad3d6cc 1575
e16362a0
AS		 1576 /* put device-specific files into sysfs */
1577 usb_create_sysfs_dev_files(udev);
1578
d9d16e8a 1579 /* Tell the world! */
f2a383e4 1580 announce_device(udev);
c066475e 1581 return err;
1da177e4
LT		 1582
1583fail:
1584 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
d9d16e8a 1585 return err;
1da177e4
LT		 1586}
1587
93993a0a
IPG		 1588
1589/**
fd39c86b
RD		 1590 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1591 * @usb_dev: USB device
1592 *
1593 * Move the USB device to a very basic state where interfaces are disabled
1594 * and the device is in fact unconfigured and unusable.
93993a0a
IPG		 1595 *
1596 * We share a lock (that we have) with device_del(), so we need to
1597 * defer its call.
1598 */
1599int usb_deauthorize_device(struct usb_device *usb_dev)
1600{
1601 unsigned cnt;
1602 usb_lock_device(usb_dev);
1603 if (usb_dev->authorized == 0)
1604 goto out_unauthorized;
1605 usb_dev->authorized = 0;
1606 usb_set_configuration(usb_dev, -1);
1607 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1608 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1609 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1610 kfree(usb_dev->config);
1611 usb_dev->config = NULL;
1612 for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
1613 kfree(usb_dev->rawdescriptors[cnt]);
1614 usb_dev->descriptor.bNumConfigurations = 0;
1615 kfree(usb_dev->rawdescriptors);
1616out_unauthorized:
1617 usb_unlock_device(usb_dev);
1618 return 0;
1619}
1620
1621
1622int usb_authorize_device(struct usb_device *usb_dev)
1623{
1624 int result = 0, c;
1625 usb_lock_device(usb_dev);
1626 if (usb_dev->authorized == 1)
1627 goto out_authorized;
1628 kfree(usb_dev->product);
1629 usb_dev->product = NULL;
1630 kfree(usb_dev->manufacturer);
1631 usb_dev->manufacturer = NULL;
1632 kfree(usb_dev->serial);
1633 usb_dev->serial = NULL;
1634 result = usb_autoresume_device(usb_dev);
1635 if (result < 0) {
1636 dev_err(&usb_dev->dev,
1637 "can't autoresume for authorization: %d\n", result);
1638 goto error_autoresume;
1639 }
1640 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1641 if (result < 0) {
1642 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1643 "authorization: %d\n", result);
1644 goto error_device_descriptor;
1645 }
1646 usb_dev->authorized = 1;
1647 result = usb_configure_device(usb_dev);
1648 if (result < 0)
1649 goto error_configure;
1650 /* Choose and set the configuration. This registers the interfaces
1651 * with the driver core and lets interface drivers bind to them.
1652 */
b5ea060f 1653 c = usb_choose_configuration(usb_dev);
93993a0a
IPG		 1654 if (c >= 0) {
1655 result = usb_set_configuration(usb_dev, c);
1656 if (result) {
1657 dev_err(&usb_dev->dev,
1658 "can't set config #%d, error %d\n", c, result);
1659 /* This need not be fatal. The user can try to
1660 * set other configurations. */
1661 }
1662 }
1663 dev_info(&usb_dev->dev, "authorized to connect\n");
1664error_configure:
1665error_device_descriptor:
1666error_autoresume:
1667out_authorized:
1668 usb_unlock_device(usb_dev); // complements locktree
1669 return result;
1670}
1671
1672
0165de09
IPG		 1673/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1674static unsigned hub_is_wusb(struct usb_hub *hub)
1675{
1676 struct usb_hcd *hcd;
1677 if (hub->hdev->parent != NULL) /* not a root hub? */
1678 return 0;
1679 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1680 return hcd->wireless;
1681}
1682
1683
1da177e4
LT		 1684#define PORT_RESET_TRIES 5
1685#define SET_ADDRESS_TRIES 2
1686#define GET_DESCRIPTOR_TRIES 2
1687#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1688#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1689
1690#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1691#define HUB_SHORT_RESET_TIME 10
1692#define HUB_LONG_RESET_TIME 200
1693#define HUB_RESET_TIMEOUT 500
1694
1695static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1696 struct usb_device *udev, unsigned int delay)
1697{
1698 int delay_time, ret;
1699 u16 portstatus;
1700 u16 portchange;
1701
1702 for (delay_time = 0;
1703 delay_time < HUB_RESET_TIMEOUT;
1704 delay_time += delay) {
1705 /* wait to give the device a chance to reset */
1706 msleep(delay);
1707
1708 /* read and decode port status */
1709 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1710 if (ret < 0)
1711 return ret;
1712
1713 /* Device went away? */
1714 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1715 return -ENOTCONN;
1716
dd4dd19e 1717 /* bomb out completely if the connection bounced */
1da177e4 1718 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1719 return -ENOTCONN;
1da177e4
LT		 1720
1721 /* if we`ve finished resetting, then break out of the loop */
1722 if (!(portstatus & USB_PORT_STAT_RESET) &&
1723 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1724 if (hub_is_wusb(hub))
1725 udev->speed = USB_SPEED_VARIABLE;
1726 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1727 udev->speed = USB_SPEED_HIGH;
1728 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1729 udev->speed = USB_SPEED_LOW;
1730 else
1731 udev->speed = USB_SPEED_FULL;
1732 return 0;
1733 }
1734
1735 /* switch to the long delay after two short delay failures */
1736 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1737 delay = HUB_LONG_RESET_TIME;
1738
1739 dev_dbg (hub->intfdev,
1740 "port %d not reset yet, waiting %dms\n",
1741 port1, delay);
1742 }
1743
1744 return -EBUSY;
1745}
1746
1747static int hub_port_reset(struct usb_hub *hub, int port1,
1748 struct usb_device *udev, unsigned int delay)
1749{
1750 int i, status;
1751
32fe0198
AS		 1752 /* Block EHCI CF initialization during the port reset.
1753 * Some companion controllers don't like it when they mix.
1754 */
1755 down_read(&ehci_cf_port_reset_rwsem);
1756
1da177e4
LT		 1757 /* Reset the port */
1758 for (i = 0; i < PORT_RESET_TRIES; i++) {
1759 status = set_port_feature(hub->hdev,
1760 port1, USB_PORT_FEAT_RESET);
1761 if (status)
1762 dev_err(hub->intfdev,
1763 "cannot reset port %d (err = %d)\n",
1764 port1, status);
1765 else {
1766 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1767 if (status && status != -ENOTCONN)
1da177e4
LT		 1768 dev_dbg(hub->intfdev,
1769 "port_wait_reset: err = %d\n",
1770 status);
1771 }
1772
1773 /* return on disconnect or reset */
1774 switch (status) {
1775 case 0:
b789696a
DB		 1776 /* TRSTRCY = 10 ms; plus some extra */
1777 msleep(10 + 40);
4953d141 1778 update_address(udev, 0);
1da177e4
LT		 1779 /* FALL THROUGH */
1780 case -ENOTCONN:
1781 case -ENODEV:
1782 clear_port_feature(hub->hdev,
1783 port1, USB_PORT_FEAT_C_RESET);
1784 /* FIXME need disconnect() for NOTATTACHED device */
1785 usb_set_device_state(udev, status
1786 ? USB_STATE_NOTATTACHED
1787 : USB_STATE_DEFAULT);
32fe0198 1788 goto done;
1da177e4
LT		 1789 }
1790
1791 dev_dbg (hub->intfdev,
1792 "port %d not enabled, trying reset again...\n",
1793 port1);
1794 delay = HUB_LONG_RESET_TIME;
1795 }
1796
1797 dev_err (hub->intfdev,
1798 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1799 port1);
1800
32fe0198
AS		 1801 done:
1802 up_read(&ehci_cf_port_reset_rwsem);
1da177e4
LT		 1803 return status;
1804}
1805
d388dab7 1806#ifdef CONFIG_PM
1da177e4 1807
b01b03f3
AS		 1808#define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
1809 USB_PORT_STAT_SUSPEND)
1810#define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
1811
1812/* Determine whether the device on a port is ready for a normal resume,
1813 * is ready for a reset-resume, or should be disconnected.
1814 */
1815static int check_port_resume_type(struct usb_device *udev,
1816 struct usb_hub *hub, int port1,
1817 int status, unsigned portchange, unsigned portstatus)
1818{
1819 /* Is the device still present? */
1820 if (status || (portstatus & MASK_BITS) != WANT_BITS) {
1821 if (status >= 0)
1822 status = -ENODEV;
1823 }
1824
86c57edf
AS		 1825 /* Can't do a normal resume if the port isn't enabled,
1826 * so try a reset-resume instead.
1827 */
1828 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
1829 if (udev->persist_enabled)
1830 udev->reset_resume = 1;
1831 else
1832 status = -ENODEV;
1833 }
b01b03f3
AS		 1834
1835 if (status) {
1836 dev_dbg(hub->intfdev,
1837 "port %d status %04x.%04x after resume, %d\n",
1838 port1, portchange, portstatus, status);
1839 } else if (udev->reset_resume) {
1840
1841 /* Late port handoff can set status-change bits */
1842 if (portchange & USB_PORT_STAT_C_CONNECTION)
1843 clear_port_feature(hub->hdev, port1,
1844 USB_PORT_FEAT_C_CONNECTION);
1845 if (portchange & USB_PORT_STAT_C_ENABLE)
1846 clear_port_feature(hub->hdev, port1,
1847 USB_PORT_FEAT_C_ENABLE);
1848 }
1849
1850 return status;
1851}
1852
1da177e4
LT		 1853#ifdef CONFIG_USB_SUSPEND
1854
1855/*
624d6c07
AS		 1856 * usb_port_suspend - suspend a usb device's upstream port
1857 * @udev: device that's no longer in active use, not a root hub
1858 * Context: must be able to sleep; device not locked; pm locks held
1859 *
1860 * Suspends a USB device that isn't in active use, conserving power.
1861 * Devices may wake out of a suspend, if anything important happens,
1862 * using the remote wakeup mechanism. They may also be taken out of
1863 * suspend by the host, using usb_port_resume(). It's also routine
1864 * to disconnect devices while they are suspended.
1865 *
1866 * This only affects the USB hardware for a device; its interfaces
1867 * (and, for hubs, child devices) must already have been suspended.
1868 *
1da177e4
LT		 1869 * Selective port suspend reduces power; most suspended devices draw
1870 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1871 * All devices below the suspended port are also suspended.
1872 *
1873 * Devices leave suspend state when the host wakes them up. Some devices
1874 * also support "remote wakeup", where the device can activate the USB
1875 * tree above them to deliver data, such as a keypress or packet. In
1876 * some cases, this wakes the USB host.
624d6c07
AS		 1877 *
1878 * Suspending OTG devices may trigger HNP, if that's been enabled
1879 * between a pair of dual-role devices. That will change roles, such
1880 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1881 *
1882 * Devices on USB hub ports have only one "suspend" state, corresponding
1883 * to ACPI D2, "may cause the device to lose some context".
1884 * State transitions include:
1885 *
1886 * - suspend, resume ... when the VBUS power link stays live
1887 * - suspend, disconnect ... VBUS lost
1888 *
1889 * Once VBUS drop breaks the circuit, the port it's using has to go through
1890 * normal re-enumeration procedures, starting with enabling VBUS power.
1891 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1892 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1893 * timer, no SRP, no requests through sysfs.
1894 *
1895 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1896 * the root hub for their bus goes into global suspend ... so we don't
1897 * (falsely) update the device power state to say it suspended.
1898 *
1899 * Returns 0 on success, else negative errno.
1da177e4 1900 */
624d6c07 1901int usb_port_suspend(struct usb_device *udev)
1da177e4 1902{
624d6c07
AS		 1903 struct usb_hub *hub = hdev_to_hub(udev->parent);
1904 int port1 = udev->portnum;
1905 int status;
1da177e4
LT		 1906
1907 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1908
1909 /* enable remote wakeup when appropriate; this lets the device
1910 * wake up the upstream hub (including maybe the root hub).
1911 *
1912 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1913 * we don't explicitly enable it here.
1914 */
645daaab 1915 if (udev->do_remote_wakeup) {
1da177e4
LT		 1916 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1917 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1918 USB_DEVICE_REMOTE_WAKEUP, 0,
1919 NULL, 0,
1920 USB_CTRL_SET_TIMEOUT);
1921 if (status)
624d6c07
AS		 1922 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1923 status);
1da177e4
LT		 1924 }
1925
1926 /* see 7.1.7.6 */
1927 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1928 if (status) {
624d6c07
AS		 1929 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1930 port1, status);
1da177e4
LT		 1931 /* paranoia: "should not happen" */
1932 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1933 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1934 USB_DEVICE_REMOTE_WAKEUP, 0,
1935 NULL, 0,
1936 USB_CTRL_SET_TIMEOUT);
1937 } else {
1938 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1939 dev_dbg(&udev->dev, "usb %ssuspend\n",
1940 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1941 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1942 msleep(10);
1943 }
1944 return status;
1945}
1946
1da177e4 1947/*
390a8c34
DB		 1948 * If the USB "suspend" state is in use (rather than "global suspend"),
1949 * many devices will be individually taken out of suspend state using
54515fe5 1950 * special "resume" signaling. This routine kicks in shortly after
1da177e4
LT		 1951 * hardware resume signaling is finished, either because of selective
1952 * resume (by host) or remote wakeup (by device) ... now see what changed
1953 * in the tree that's rooted at this device.
54515fe5
AS		 1954 *
1955 * If @udev->reset_resume is set then the device is reset before the
1956 * status check is done.
1da177e4 1957 */
140d8f68 1958static int finish_port_resume(struct usb_device *udev)
1da177e4 1959{
54515fe5 1960 int status = 0;
1da177e4
LT		 1961 u16 devstatus;
1962
1963 /* caller owns the udev device lock */
54515fe5
AS		 1964 dev_dbg(&udev->dev, "finish %sresume\n",
1965 udev->reset_resume ? "reset-" : "");
1da177e4
LT		 1966
1967 /* usb ch9 identifies four variants of SUSPENDED, based on what
1968 * state the device resumes to. Linux currently won't see the
1969 * first two on the host side; they'd be inside hub_port_init()
1970 * during many timeouts, but khubd can't suspend until later.
1971 */
1972 usb_set_device_state(udev, udev->actconfig
1973 ? USB_STATE_CONFIGURED
1974 : USB_STATE_ADDRESS);
1da177e4 1975
54515fe5
AS		 1976 /* 10.5.4.5 says not to reset a suspended port if the attached
1977 * device is enabled for remote wakeup. Hence the reset
1978 * operation is carried out here, after the port has been
1979 * resumed.
1980 */
1981 if (udev->reset_resume)
86c57edf 1982 retry_reset_resume:
742120c6 1983 status = usb_reset_and_verify_device(udev);
54515fe5 1984
1da177e4
LT		 1985 /* 10.5.4.5 says be sure devices in the tree are still there.
1986 * For now let's assume the device didn't go crazy on resume,
1987 * and device drivers will know about any resume quirks.
1988 */
54515fe5 1989 if (status == 0) {
46dede46 1990 devstatus = 0;
54515fe5
AS		 1991 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1992 if (status >= 0)
46dede46 1993 status = (status > 0 ? 0 : -ENODEV);
86c57edf
AS		 1994
1995 /* If a normal resume failed, try doing a reset-resume */
1996 if (status && !udev->reset_resume && udev->persist_enabled) {
1997 dev_dbg(&udev->dev, "retry with reset-resume\n");
1998 udev->reset_resume = 1;
1999 goto retry_reset_resume;
2000 }
54515fe5 2001 }
b40b7a90 2002
624d6c07
AS		 2003 if (status) {
2004 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
2005 status);
2006 } else if (udev->actconfig) {
1da177e4 2007 le16_to_cpus(&devstatus);
686314cf 2008 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1da177e4
LT		 2009 status = usb_control_msg(udev,
2010 usb_sndctrlpipe(udev, 0),
2011 USB_REQ_CLEAR_FEATURE,
2012 USB_RECIP_DEVICE,
2013 USB_DEVICE_REMOTE_WAKEUP, 0,
2014 NULL, 0,
2015 USB_CTRL_SET_TIMEOUT);
a8e7c565 2016 if (status)
1da177e4
LT		 2017 dev_dbg(&udev->dev, "disable remote "
2018 "wakeup, status %d\n", status);
4bf0ba86 2019 }
1da177e4 2020 status = 0;
1da177e4
LT		 2021 }
2022 return status;
2023}
2024
624d6c07
AS		 2025/*
2026 * usb_port_resume - re-activate a suspended usb device's upstream port
2027 * @udev: device to re-activate, not a root hub
2028 * Context: must be able to sleep; device not locked; pm locks held
2029 *
2030 * This will re-activate the suspended device, increasing power usage
2031 * while letting drivers communicate again with its endpoints.
2032 * USB resume explicitly guarantees that the power session between
2033 * the host and the device is the same as it was when the device
2034 * suspended.
2035 *
feccc30d
AS		 2036 * If @udev->reset_resume is set then this routine won't check that the
2037 * port is still enabled. Furthermore, finish_port_resume() above will
54515fe5
AS		 2038 * reset @udev. The end result is that a broken power session can be
2039 * recovered and @udev will appear to persist across a loss of VBUS power.
2040 *
2041 * For example, if a host controller doesn't maintain VBUS suspend current
2042 * during a system sleep or is reset when the system wakes up, all the USB
2043 * power sessions below it will be broken. This is especially troublesome
2044 * for mass-storage devices containing mounted filesystems, since the
2045 * device will appear to have disconnected and all the memory mappings
2046 * to it will be lost. Using the USB_PERSIST facility, the device can be
2047 * made to appear as if it had not disconnected.
2048 *
742120c6 2049 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
feccc30d 2050 * every effort to insure that the same device is present after the
54515fe5
AS		 2051 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2052 * quite possible for a device to remain unaltered but its media to be
2053 * changed. If the user replaces a flash memory card while the system is
2054 * asleep, he will have only himself to blame when the filesystem on the
2055 * new card is corrupted and the system crashes.
2056 *
624d6c07
AS		 2057 * Returns 0 on success, else negative errno.
2058 */
2059int usb_port_resume(struct usb_device *udev)
1da177e4 2060{
624d6c07
AS		 2061 struct usb_hub *hub = hdev_to_hub(udev->parent);
2062 int port1 = udev->portnum;
2063 int status;
2064 u16 portchange, portstatus;
d25450c6
AS		 2065
2066 /* Skip the initial Clear-Suspend step for a remote wakeup */
2067 status = hub_port_status(hub, port1, &portstatus, &portchange);
2068 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
2069 goto SuspendCleared;
1da177e4
LT		 2070
2071 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2072
d5cbad4b
AS		 2073 set_bit(port1, hub->busy_bits);
2074
1da177e4
LT		 2075 /* see 7.1.7.7; affects power usage, but not budgeting */
2076 status = clear_port_feature(hub->hdev,
2077 port1, USB_PORT_FEAT_SUSPEND);
2078 if (status) {
624d6c07
AS		 2079 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2080 port1, status);
1da177e4 2081 } else {
1da177e4 2082 /* drive resume for at least 20 msec */
686314cf
AS		 2083 dev_dbg(&udev->dev, "usb %sresume\n",
2084 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 2085 msleep(25);
2086
1da177e4
LT		 2087 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2088 * stop resume signaling. Then finish the resume
2089 * sequence.
2090 */
d25450c6 2091 status = hub_port_status(hub, port1, &portstatus, &portchange);
54515fe5 2092
b01b03f3
AS		 2093 /* TRSMRCY = 10 msec */
2094 msleep(10);
2095 }
2096
54515fe5 2097 SuspendCleared:
b01b03f3
AS		 2098 if (status == 0) {
2099 if (portchange & USB_PORT_STAT_C_SUSPEND)
2100 clear_port_feature(hub->hdev, port1,
2101 USB_PORT_FEAT_C_SUSPEND);
1da177e4 2102 }
1da177e4 2103
d5cbad4b 2104 clear_bit(port1, hub->busy_bits);
d5cbad4b 2105
b01b03f3
AS		 2106 status = check_port_resume_type(udev,
2107 hub, port1, status, portchange, portstatus);
54515fe5
AS		 2108 if (status == 0)
2109 status = finish_port_resume(udev);
2110 if (status < 0) {
2111 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2112 hub_port_logical_disconnect(hub, port1);
2113 }
1da177e4
LT		 2114 return status;
2115}
2116
8808f00c 2117/* caller has locked udev */
1da177e4
LT		 2118static int remote_wakeup(struct usb_device *udev)
2119{
2120 int status = 0;
2121
1da177e4 2122 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 2123 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 2124 usb_mark_last_busy(udev);
6b157c9b 2125 status = usb_external_resume_device(udev);
1da177e4 2126 }
1da177e4
LT		 2127 return status;
2128}
2129
d388dab7
AS		 2130#else /* CONFIG_USB_SUSPEND */
2131
2132/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2133
2134int usb_port_suspend(struct usb_device *udev)
2135{
2136 return 0;
2137}
2138
b01b03f3
AS		 2139/* However we may need to do a reset-resume */
2140
d388dab7
AS		 2141int usb_port_resume(struct usb_device *udev)
2142{
b01b03f3
AS		 2143 struct usb_hub *hub = hdev_to_hub(udev->parent);
2144 int port1 = udev->portnum;
2145 int status;
2146 u16 portchange, portstatus;
2147
2148 status = hub_port_status(hub, port1, &portstatus, &portchange);
2149 status = check_port_resume_type(udev,
2150 hub, port1, status, portchange, portstatus);
54515fe5 2151
b01b03f3
AS		 2152 if (status) {
2153 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2154 hub_port_logical_disconnect(hub, port1);
2155 } else if (udev->reset_resume) {
54515fe5 2156 dev_dbg(&udev->dev, "reset-resume\n");
742120c6 2157 status = usb_reset_and_verify_device(udev);
54515fe5
AS		 2158 }
2159 return status;
d388dab7
AS		 2160}
2161
2162static inline int remote_wakeup(struct usb_device *udev)
2163{
2164 return 0;
2165}
2166
2167#endif
2168
db690874 2169static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 2170{
2171 struct usb_hub *hub = usb_get_intfdata (intf);
2172 struct usb_device *hdev = hub->hdev;
2173 unsigned port1;
1da177e4 2174
c9f89fa4 2175 /* fail if children aren't already suspended */
1da177e4
LT		 2176 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2177 struct usb_device *udev;
2178
2179 udev = hdev->children [port1-1];
6840d255 2180 if (udev && udev->can_submit) {
645daaab
AS		 2181 if (!hdev->auto_pm)
2182 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2183 port1);
c9f89fa4
DB		 2184 return -EBUSY;
2185 }
1da177e4
LT		 2186 }
2187
441b62c1 2188 dev_dbg(&intf->dev, "%s\n", __func__);
40f122f3 2189
12f1ff83 2190 /* stop khubd and related activity */
4330354f 2191 hub_quiesce(hub, HUB_SUSPEND);
b6f6436d 2192 return 0;
1da177e4
LT		 2193}
2194
2195static int hub_resume(struct usb_interface *intf)
2196{
5e6effae 2197 struct usb_hub *hub = usb_get_intfdata(intf);
40f122f3 2198
5e6effae 2199 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2200 hub_activate(hub, HUB_RESUME);
1da177e4
LT		 2201 return 0;
2202}
2203
b41a60ec 2204static int hub_reset_resume(struct usb_interface *intf)
f07600cf 2205{
b41a60ec 2206 struct usb_hub *hub = usb_get_intfdata(intf);
f07600cf 2207
5e6effae 2208 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2209 hub_activate(hub, HUB_RESET_RESUME);
f07600cf
AS		 2210 return 0;
2211}
2212
54515fe5
AS		 2213/**
2214 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2215 * @rhdev: struct usb_device for the root hub
2216 *
2217 * The USB host controller driver calls this function when its root hub
2218 * is resumed and Vbus power has been interrupted or the controller
feccc30d
AS		 2219 * has been reset. The routine marks @rhdev as having lost power.
2220 * When the hub driver is resumed it will take notice and carry out
2221 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2222 * the others will be disconnected.
54515fe5
AS		 2223 */
2224void usb_root_hub_lost_power(struct usb_device *rhdev)
2225{
2226 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2227 rhdev->reset_resume = 1;
2228}
2229EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2230
d388dab7
AS		 2231#else /* CONFIG_PM */
2232
2233static inline int remote_wakeup(struct usb_device *udev)
2234{
2235 return 0;
2236}
2237
f07600cf
AS		 2238#define hub_suspend NULL
2239#define hub_resume NULL
2240#define hub_reset_resume NULL
d388dab7
AS		 2241#endif
2242
1da177e4
LT		 2243
2244/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2245 *
2246 * Between connect detection and reset signaling there must be a delay
2247 * of 100ms at least for debounce and power-settling. The corresponding
2248 * timer shall restart whenever the downstream port detects a disconnect.
2249 *
2250 * Apparently there are some bluetooth and irda-dongles and a number of
2251 * low-speed devices for which this debounce period may last over a second.
2252 * Not covered by the spec - but easy to deal with.
2253 *
2254 * This implementation uses a 1500ms total debounce timeout; if the
2255 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2256 * every 25ms for transient disconnects. When the port status has been
2257 * unchanged for 100ms it returns the port status.
2258 */
1da177e4
LT		 2259static int hub_port_debounce(struct usb_hub *hub, int port1)
2260{
2261 int ret;
2262 int total_time, stable_time = 0;
2263 u16 portchange, portstatus;
2264 unsigned connection = 0xffff;
2265
2266 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2267 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2268 if (ret < 0)
2269 return ret;
2270
2271 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2272 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2273 stable_time += HUB_DEBOUNCE_STEP;
2274 if (stable_time >= HUB_DEBOUNCE_STABLE)
2275 break;
2276 } else {
2277 stable_time = 0;
2278 connection = portstatus & USB_PORT_STAT_CONNECTION;
2279 }
2280
2281 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2282 clear_port_feature(hub->hdev, port1,
2283 USB_PORT_FEAT_C_CONNECTION);
2284 }
2285
2286 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2287 break;
2288 msleep(HUB_DEBOUNCE_STEP);
2289 }
2290
2291 dev_dbg (hub->intfdev,
2292 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2293 port1, total_time, stable_time, portstatus);
2294
2295 if (stable_time < HUB_DEBOUNCE_STABLE)
2296 return -ETIMEDOUT;
2297 return portstatus;
2298}
2299
fc721f51 2300void usb_ep0_reinit(struct usb_device *udev)
1da177e4
LT		 2301{
2302 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2303 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
bdd016ba 2304 usb_enable_endpoint(udev, &udev->ep0);
1da177e4 2305}
fc721f51 2306EXPORT_SYMBOL_GPL(usb_ep0_reinit);
1da177e4
LT		 2307
2308#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2309#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2310
4326ed0b 2311static int hub_set_address(struct usb_device *udev, int devnum)
1da177e4
LT		 2312{
2313 int retval;
2314
4326ed0b 2315 if (devnum <= 1)
1da177e4
LT		 2316 return -EINVAL;
2317 if (udev->state == USB_STATE_ADDRESS)
2318 return 0;
2319 if (udev->state != USB_STATE_DEFAULT)
2320 return -EINVAL;
2321 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4326ed0b 2322 USB_REQ_SET_ADDRESS, 0, devnum, 0,
1da177e4
LT		 2323 NULL, 0, USB_CTRL_SET_TIMEOUT);
2324 if (retval == 0) {
4953d141
DV		 2325 /* Device now using proper address. */
2326 update_address(udev, devnum);
1da177e4 2327 usb_set_device_state(udev, USB_STATE_ADDRESS);
fc721f51 2328 usb_ep0_reinit(udev);
1da177e4
LT		 2329 }
2330 return retval;
2331}
2332
2333/* Reset device, (re)assign address, get device descriptor.
2334 * Device connection must be stable, no more debouncing needed.
2335 * Returns device in USB_STATE_ADDRESS, except on error.
2336 *
2337 * If this is called for an already-existing device (as part of
742120c6 2338 * usb_reset_and_verify_device), the caller must own the device lock. For a
1da177e4
LT		 2339 * newly detected device that is not accessible through any global
2340 * pointers, it's not necessary to lock the device.
2341 */
2342static int
2343hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2344 int retry_counter)
2345{
4186ecf8 2346 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2347
2348 struct usb_device *hdev = hub->hdev;
2349 int i, j, retval;
2350 unsigned delay = HUB_SHORT_RESET_TIME;
2351 enum usb_device_speed oldspeed = udev->speed;
83a07196 2352 char *speed, *type;
4326ed0b 2353 int devnum = udev->devnum;
1da177e4
LT		 2354
2355 /* root hub ports have a slightly longer reset period
2356 * (from USB 2.0 spec, section 7.1.7.5)
2357 */
2358 if (!hdev->parent) {
2359 delay = HUB_ROOT_RESET_TIME;
2360 if (port1 == hdev->bus->otg_port)
2361 hdev->bus->b_hnp_enable = 0;
2362 }
2363
2364 /* Some low speed devices have problems with the quick delay, so */
2365 /* be a bit pessimistic with those devices. RHbug #23670 */
2366 if (oldspeed == USB_SPEED_LOW)
2367 delay = HUB_LONG_RESET_TIME;
2368
4186ecf8 2369 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2370
2371 /* Reset the device; full speed may morph to high speed */
2372 retval = hub_port_reset(hub, port1, udev, delay);
2373 if (retval < 0) /* error or disconnect */
2374 goto fail;
2375 /* success, speed is known */
2376 retval = -ENODEV;
2377
2378 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2379 dev_dbg(&udev->dev, "device reset changed speed!\n");
2380 goto fail;
2381 }
2382 oldspeed = udev->speed;
4326ed0b 2383
1da177e4
LT		 2384 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2385 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2386 * For Wireless USB devices, ep0 max packet is always 512 (tho
2387 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2388 */
2389 switch (udev->speed) {
5bb6e0ae
IPG		 2390 case USB_SPEED_VARIABLE: /* fixed at 512 */
2391 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2392 break;
1da177e4
LT		 2393 case USB_SPEED_HIGH: /* fixed at 64 */
2394 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2395 break;
2396 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2397 /* to determine the ep0 maxpacket size, try to read
2398 * the device descriptor to get bMaxPacketSize0 and
2399 * then correct our initial guess.
2400 */
2401 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2402 break;
2403 case USB_SPEED_LOW: /* fixed at 8 */
2404 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2405 break;
2406 default:
2407 goto fail;
2408 }
2409
83a07196
IPG		 2410 type = "";
2411 switch (udev->speed) {
2412 case USB_SPEED_LOW: speed = "low"; break;
2413 case USB_SPEED_FULL: speed = "full"; break;
2414 case USB_SPEED_HIGH: speed = "high"; break;
2415 case USB_SPEED_VARIABLE:
2416 speed = "variable";
2417 type = "Wireless ";
2418 break;
2419 default: speed = "?"; break;
2420 }
1da177e4 2421 dev_info (&udev->dev,
83a07196
IPG		 2422 "%s %s speed %sUSB device using %s and address %d\n",
2423 (udev->config) ? "reset" : "new", speed, type,
4326ed0b 2424 udev->bus->controller->driver->name, devnum);
1da177e4
LT		 2425
2426 /* Set up TT records, if needed */
2427 if (hdev->tt) {
2428 udev->tt = hdev->tt;
2429 udev->ttport = hdev->ttport;
2430 } else if (udev->speed != USB_SPEED_HIGH
2431 && hdev->speed == USB_SPEED_HIGH) {
2432 udev->tt = &hub->tt;
2433 udev->ttport = port1;
2434 }
2435
2436 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2437 * Because device hardware and firmware is sometimes buggy in
2438 * this area, and this is how Linux has done it for ages.
2439 * Change it cautiously.
2440 *
2441 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2442 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2443 * so it may help with some non-standards-compliant devices.
2444 * Otherwise we start with SET_ADDRESS and then try to read the
2445 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2446 * value.
2447 */
2448 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2449 if (USE_NEW_SCHEME(retry_counter)) {
2450 struct usb_device_descriptor *buf;
2451 int r = 0;
2452
2453#define GET_DESCRIPTOR_BUFSIZE 64
2454 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2455 if (!buf) {
2456 retval = -ENOMEM;
2457 continue;
2458 }
2459
b89ee19a
AS		 2460 /* Retry on all errors; some devices are flakey.
2461 * 255 is for WUSB devices, we actually need to use
2462 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2463 */
2464 for (j = 0; j < 3; ++j) {
2465 buf->bMaxPacketSize0 = 0;
2466 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2467 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2468 USB_DT_DEVICE << 8, 0,
2469 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2470 USB_CTRL_GET_TIMEOUT);
1da177e4 2471 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2472 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2473 if (buf->bDescriptorType ==
2474 USB_DT_DEVICE) {
2475 r = 0;
2476 break;
2477 }
2478 /* FALL THROUGH */
2479 default:
2480 if (r == 0)
2481 r = -EPROTO;
2482 break;
2483 }
2484 if (r == 0)
2485 break;
2486 }
2487 udev->descriptor.bMaxPacketSize0 =
2488 buf->bMaxPacketSize0;
2489 kfree(buf);
2490
2491 retval = hub_port_reset(hub, port1, udev, delay);
2492 if (retval < 0) /* error or disconnect */
2493 goto fail;
2494 if (oldspeed != udev->speed) {
2495 dev_dbg(&udev->dev,
2496 "device reset changed speed!\n");
2497 retval = -ENODEV;
2498 goto fail;
2499 }
2500 if (r) {
2501 dev_err(&udev->dev, "device descriptor "
2502 "read/%s, error %d\n",
2503 "64", r);
2504 retval = -EMSGSIZE;
2505 continue;
2506 }
2507#undef GET_DESCRIPTOR_BUFSIZE
2508 }
2509
6c529cdc
IPG		 2510 /*
2511 * If device is WUSB, we already assigned an
2512 * unauthorized address in the Connect Ack sequence;
2513 * authorization will assign the final address.
2514 */
2515 if (udev->wusb == 0) {
2516 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2517 retval = hub_set_address(udev, devnum);
2518 if (retval >= 0)
2519 break;
2520 msleep(200);
2521 }
2522 if (retval < 0) {
2523 dev_err(&udev->dev,
2524 "device not accepting address %d, error %d\n",
2525 devnum, retval);
2526 goto fail;
2527 }
2528
2529 /* cope with hardware quirkiness:
2530 * - let SET_ADDRESS settle, some device hardware wants it
2531 * - read ep0 maxpacket even for high and low speed,
2532 */
2533 msleep(10);
2534 if (USE_NEW_SCHEME(retry_counter))
1da177e4 2535 break;
6c529cdc 2536 }
1da177e4
LT		 2537
2538 retval = usb_get_device_descriptor(udev, 8);
2539 if (retval < 8) {
2540 dev_err(&udev->dev, "device descriptor "
2541 "read/%s, error %d\n",
2542 "8", retval);
2543 if (retval >= 0)
2544 retval = -EMSGSIZE;
2545 } else {
2546 retval = 0;
2547 break;
2548 }
2549 }
2550 if (retval)
2551 goto fail;
2552
6c529cdc 2553 i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */
5bb6e0ae 2554 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2555 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2556 if (udev->speed != USB_SPEED_FULL ||
2557 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2558 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2559 retval = -EMSGSIZE;
2560 goto fail;
2561 }
2562 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2563 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
fc721f51 2564 usb_ep0_reinit(udev);
1da177e4
LT		 2565 }
2566
2567 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2568 if (retval < (signed)sizeof(udev->descriptor)) {
2569 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2570 "all", retval);
2571 if (retval >= 0)
2572 retval = -ENOMSG;
2573 goto fail;
2574 }
2575
2576 retval = 0;
2577
2578fail:
4326ed0b 2579 if (retval) {
1da177e4 2580 hub_port_disable(hub, port1, 0);
4953d141 2581 update_address(udev, devnum); /* for disconnect processing */
4326ed0b 2582 }
4186ecf8 2583 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2584 return retval;
2585}
2586
2587static void
2588check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2589{
2590 struct usb_qualifier_descriptor *qual;
2591 int status;
2592
e94b1766 2593 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2594 if (qual == NULL)
2595 return;
2596
2597 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2598 qual, sizeof *qual);
2599 if (status == sizeof *qual) {
2600 dev_info(&udev->dev, "not running at top speed; "
2601 "connect to a high speed hub\n");
2602 /* hub LEDs are probably harder to miss than syslog */
2603 if (hub->has_indicators) {
2604 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2605 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2606 }
2607 }
1bc3c9e1 2608 kfree(qual);
1da177e4
LT		 2609}
2610
2611static unsigned
2612hub_power_remaining (struct usb_hub *hub)
2613{
2614 struct usb_device *hdev = hub->hdev;
2615 int remaining;
55c52718 2616 int port1;
1da177e4 2617
55c52718 2618 if (!hub->limited_power)
1da177e4
LT		 2619 return 0;
2620
55c52718
AS		 2621 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2622 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2623 struct usb_device *udev = hdev->children[port1 - 1];
2624 int delta;
1da177e4
LT		 2625
2626 if (!udev)
2627 continue;
2628
55c52718
AS		 2629 /* Unconfigured devices may not use more than 100mA,
2630 * or 8mA for OTG ports */
1da177e4 2631 if (udev->actconfig)
55c52718
AS		 2632 delta = udev->actconfig->desc.bMaxPower * 2;
2633 else if (port1 != udev->bus->otg_port || hdev->parent)
2634 delta = 100;
1da177e4 2635 else
55c52718
AS		 2636 delta = 8;
2637 if (delta > hub->mA_per_port)
2638 dev_warn(&udev->dev, "%dmA is over %umA budget "
2639 "for port %d!\n",
2640 delta, hub->mA_per_port, port1);
1da177e4
LT		 2641 remaining -= delta;
2642 }
2643 if (remaining < 0) {
55c52718
AS		 2644 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2645 - remaining);
1da177e4
LT		 2646 remaining = 0;
2647 }
2648 return remaining;
2649}
2650
2651/* Handle physical or logical connection change events.
2652 * This routine is called when:
2653 * a port connection-change occurs;
2654 * a port enable-change occurs (often caused by EMI);
742120c6 2655 * usb_reset_and_verify_device() encounters changed descriptors (as from
1da177e4
LT		 2656 * a firmware download)
2657 * caller already locked the hub
2658 */
2659static void hub_port_connect_change(struct usb_hub *hub, int port1,
2660 u16 portstatus, u16 portchange)
2661{
2662 struct usb_device *hdev = hub->hdev;
2663 struct device *hub_dev = hub->intfdev;
90da096e 2664 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
24618b0c
AS		 2665 unsigned wHubCharacteristics =
2666 le16_to_cpu(hub->descriptor->wHubCharacteristics);
8808f00c 2667 struct usb_device *udev;
1da177e4 2668 int status, i;
24618b0c 2669
1da177e4
LT		 2670 dev_dbg (hub_dev,
2671 "port %d, status %04x, change %04x, %s\n",
2672 port1, portstatus, portchange, portspeed (portstatus));
2673
2674 if (hub->has_indicators) {
2675 set_port_led(hub, port1, HUB_LED_AUTO);
2676 hub->indicator[port1-1] = INDICATOR_AUTO;
2677 }
1da177e4
LT		 2678
2679#ifdef CONFIG_USB_OTG
2680 /* during HNP, don't repeat the debounce */
2681 if (hdev->bus->is_b_host)
24618b0c
AS		 2682 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
2683 USB_PORT_STAT_C_ENABLE);
1da177e4
LT		 2684#endif
2685
8808f00c
AS		 2686 /* Try to resuscitate an existing device */
2687 udev = hdev->children[port1-1];
2688 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
2689 udev->state != USB_STATE_NOTATTACHED) {
8808f00c
AS		 2690 usb_lock_device(udev);
2691 if (portstatus & USB_PORT_STAT_ENABLE) {
2692 status = 0; /* Nothing to do */
8808f00c
AS		 2693
2694#ifdef CONFIG_USB_SUSPEND
5257d97a
AS		 2695 } else if (udev->state == USB_STATE_SUSPENDED &&
2696 udev->persist_enabled) {
8808f00c
AS		 2697 /* For a suspended device, treat this as a
2698 * remote wakeup event.
2699 */
2700 if (udev->do_remote_wakeup)
2701 status = remote_wakeup(udev);
2702
2703 /* Otherwise leave it be; devices can't tell the
2704 * difference between suspended and disabled.
2705 */
2706 else
2707 status = 0;
2708#endif
2709
2710 } else {
5257d97a 2711 status = -ENODEV; /* Don't resuscitate */
8808f00c
AS		 2712 }
2713 usb_unlock_device(udev);
2714
2715 if (status == 0) {
2716 clear_bit(port1, hub->change_bits);
2717 return;
2718 }
2719 }
2720
24618b0c 2721 /* Disconnect any existing devices under this port */
8808f00c 2722 if (udev)
24618b0c
AS		 2723 usb_disconnect(&hdev->children[port1-1]);
2724 clear_bit(port1, hub->change_bits);
2725
5257d97a
AS		 2726 if (portchange & (USB_PORT_STAT_C_CONNECTION |
2727 USB_PORT_STAT_C_ENABLE)) {
2728 status = hub_port_debounce(hub, port1);
2729 if (status < 0) {
2730 if (printk_ratelimit())
2731 dev_err(hub_dev, "connect-debounce failed, "
2732 "port %d disabled\n", port1);
2733 portstatus &= ~USB_PORT_STAT_CONNECTION;
2734 } else {
2735 portstatus = status;
2736 }
2737 }
2738
24618b0c 2739 /* Return now if debouncing failed or nothing is connected */
1da177e4
LT		 2740 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2741
2742 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2743 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2744 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2745 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
5257d97a 2746
1da177e4
LT		 2747 if (portstatus & USB_PORT_STAT_ENABLE)
2748 goto done;
2749 return;
2750 }
2751
1da177e4 2752 for (i = 0; i < SET_CONFIG_TRIES; i++) {
1da177e4
LT		 2753
2754 /* reallocate for each attempt, since references
2755 * to the previous one can escape in various ways
2756 */
2757 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2758 if (!udev) {
2759 dev_err (hub_dev,
2760 "couldn't allocate port %d usb_device\n",
2761 port1);
2762 goto done;
2763 }
2764
2765 usb_set_device_state(udev, USB_STATE_POWERED);
2766 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2767 udev->bus_mA = hub->mA_per_port;
b6956ffa 2768 udev->level = hdev->level + 1;
8af548dc 2769 udev->wusb = hub_is_wusb(hub);
55c52718 2770
1da177e4
LT		 2771 /* set the address */
2772 choose_address(udev);
2773 if (udev->devnum <= 0) {
2774 status = -ENOTCONN; /* Don't retry */
2775 goto loop;
2776 }
2777
2778 /* reset and get descriptor */
2779 status = hub_port_init(hub, udev, port1, i);
2780 if (status < 0)
2781 goto loop;
2782
2783 /* consecutive bus-powered hubs aren't reliable; they can
2784 * violate the voltage drop budget. if the new child has
2785 * a "powered" LED, users should notice we didn't enable it
2786 * (without reading syslog), even without per-port LEDs
2787 * on the parent.
2788 */
2789 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2790 && udev->bus_mA <= 100) {
1da177e4
LT		 2791 u16 devstat;
2792
2793 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2794 &devstat);
55c52718 2795 if (status < 2) {
1da177e4
LT		 2796 dev_dbg(&udev->dev, "get status %d ?\n", status);
2797 goto loop_disable;
2798 }
55c52718 2799 le16_to_cpus(&devstat);
1da177e4
LT		 2800 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2801 dev_err(&udev->dev,
2802 "can't connect bus-powered hub "
2803 "to this port\n");
2804 if (hub->has_indicators) {
2805 hub->indicator[port1-1] =
2806 INDICATOR_AMBER_BLINK;
c4028958 2807 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2808 }
2809 status = -ENOTCONN; /* Don't retry */
2810 goto loop_disable;
2811 }
2812 }
2813
2814 /* check for devices running slower than they could */
2815 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2816 && udev->speed == USB_SPEED_FULL
2817 && highspeed_hubs != 0)
2818 check_highspeed (hub, udev, port1);
2819
2820 /* Store the parent's children[] pointer. At this point
2821 * udev becomes globally accessible, although presumably
2822 * no one will look at it until hdev is unlocked.
2823 */
1da177e4
LT		 2824 status = 0;
2825
2826 /* We mustn't add new devices if the parent hub has
2827 * been disconnected; we would race with the
2828 * recursively_mark_NOTATTACHED() routine.
2829 */
2830 spin_lock_irq(&device_state_lock);
2831 if (hdev->state == USB_STATE_NOTATTACHED)
2832 status = -ENOTCONN;
2833 else
2834 hdev->children[port1-1] = udev;
2835 spin_unlock_irq(&device_state_lock);
2836
2837 /* Run it through the hoops (find a driver, etc) */
2838 if (!status) {
2839 status = usb_new_device(udev);
2840 if (status) {
2841 spin_lock_irq(&device_state_lock);
2842 hdev->children[port1-1] = NULL;
2843 spin_unlock_irq(&device_state_lock);
2844 }
2845 }
2846
1da177e4
LT		 2847 if (status)
2848 goto loop_disable;
2849
2850 status = hub_power_remaining(hub);
2851 if (status)
55c52718 2852 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2853
2854 return;
2855
2856loop_disable:
2857 hub_port_disable(hub, port1, 1);
2858loop:
fc721f51 2859 usb_ep0_reinit(udev);
1da177e4
LT		 2860 release_address(udev);
2861 usb_put_dev(udev);
ffcdc18d 2862 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT		 2863 break;
2864 }
3a31155c
AS		 2865 if (hub->hdev->parent ||
2866 !hcd->driver->port_handed_over ||
2867 !(hcd->driver->port_handed_over)(hcd, port1))
2868 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
2869 port1);
1da177e4
LT		 2870
2871done:
2872 hub_port_disable(hub, port1, 1);
90da096e
BR		 2873 if (hcd->driver->relinquish_port && !hub->hdev->parent)
2874 hcd->driver->relinquish_port(hcd, port1);
1da177e4
LT		 2875}
2876
2877static void hub_events(void)
2878{
2879 struct list_head *tmp;
2880 struct usb_device *hdev;
2881 struct usb_interface *intf;
2882 struct usb_hub *hub;
2883 struct device *hub_dev;
2884 u16 hubstatus;
2885 u16 hubchange;
2886 u16 portstatus;
2887 u16 portchange;
2888 int i, ret;
2889 int connect_change;
2890
2891 /*
2892 * We restart the list every time to avoid a deadlock with
2893 * deleting hubs downstream from this one. This should be
2894 * safe since we delete the hub from the event list.
2895 * Not the most efficient, but avoids deadlocks.
2896 */
2897 while (1) {
2898
2899 /* Grab the first entry at the beginning of the list */
2900 spin_lock_irq(&hub_event_lock);
2901 if (list_empty(&hub_event_list)) {
2902 spin_unlock_irq(&hub_event_lock);
2903 break;
2904 }
2905
2906 tmp = hub_event_list.next;
2907 list_del_init(tmp);
2908
2909 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS		 2910 kref_get(&hub->kref);
2911 spin_unlock_irq(&hub_event_lock);
1da177e4 2912
e8054854
AS		 2913 hdev = hub->hdev;
2914 hub_dev = hub->intfdev;
2915 intf = to_usb_interface(hub_dev);
40f122f3 2916 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2917 hdev->state, hub->descriptor
2918 ? hub->descriptor->bNbrPorts
2919 : 0,
2920 /* NOTE: expects max 15 ports... */
2921 (u16) hub->change_bits[0],
40f122f3 2922 (u16) hub->event_bits[0]);
1da177e4 2923
1da177e4
LT		 2924 /* Lock the device, then check to see if we were
2925 * disconnected while waiting for the lock to succeed. */
06b84e8a 2926 usb_lock_device(hdev);
e8054854 2927 if (unlikely(hub->disconnected))
1da177e4
LT		 2928 goto loop;
2929
2930 /* If the hub has died, clean up after it */
2931 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b 2932 hub->error = -ENODEV;
4330354f 2933 hub_quiesce(hub, HUB_DISCONNECT);
1da177e4
LT		 2934 goto loop;
2935 }
2936
40f122f3
AS		 2937 /* Autoresume */
2938 ret = usb_autopm_get_interface(intf);
2939 if (ret) {
2940 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2941 goto loop;
2942 }
a8e7c565 2943
40f122f3 2944 /* If this is an inactive hub, do nothing */
1da177e4 2945 if (hub->quiescing)
40f122f3 2946 goto loop_autopm;
1da177e4
LT		 2947
2948 if (hub->error) {
2949 dev_dbg (hub_dev, "resetting for error %d\n",
2950 hub->error);
2951
742120c6 2952 ret = usb_reset_device(hdev);
1da177e4
LT		 2953 if (ret) {
2954 dev_dbg (hub_dev,
2955 "error resetting hub: %d\n", ret);
40f122f3 2956 goto loop_autopm;
1da177e4
LT		 2957 }
2958
2959 hub->nerrors = 0;
2960 hub->error = 0;
2961 }
2962
2963 /* deal with port status changes */
2964 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2965 if (test_bit(i, hub->busy_bits))
2966 continue;
2967 connect_change = test_bit(i, hub->change_bits);
2968 if (!test_and_clear_bit(i, hub->event_bits) &&
6ee0b270 2969 !connect_change)
1da177e4
LT		 2970 continue;
2971
2972 ret = hub_port_status(hub, i,
2973 &portstatus, &portchange);
2974 if (ret < 0)
2975 continue;
2976
1da177e4
LT		 2977 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2978 clear_port_feature(hdev, i,
2979 USB_PORT_FEAT_C_CONNECTION);
2980 connect_change = 1;
2981 }
2982
2983 if (portchange & USB_PORT_STAT_C_ENABLE) {
2984 if (!connect_change)
2985 dev_dbg (hub_dev,
2986 "port %d enable change, "
2987 "status %08x\n",
2988 i, portstatus);
2989 clear_port_feature(hdev, i,
2990 USB_PORT_FEAT_C_ENABLE);
2991
2992 /*
2993 * EM interference sometimes causes badly
2994 * shielded USB devices to be shutdown by
2995 * the hub, this hack enables them again.
2996 * Works at least with mouse driver.
2997 */
2998 if (!(portstatus & USB_PORT_STAT_ENABLE)
2999 && !connect_change
3000 && hdev->children[i-1]) {
3001 dev_err (hub_dev,
3002 "port %i "
3003 "disabled by hub (EMI?), "
3004 "re-enabling...\n",
3005 i);
3006 connect_change = 1;
3007 }
3008 }
3009
3010 if (portchange & USB_PORT_STAT_C_SUSPEND) {
8808f00c
AS		 3011 struct usb_device *udev;
3012
1da177e4
LT		 3013 clear_port_feature(hdev, i,
3014 USB_PORT_FEAT_C_SUSPEND);
8808f00c
AS		 3015 udev = hdev->children[i-1];
3016 if (udev) {
3017 usb_lock_device(udev);
1da177e4
LT		 3018 ret = remote_wakeup(hdev->
3019 children[i-1]);
8808f00c 3020 usb_unlock_device(udev);
1da177e4
LT		 3021 if (ret < 0)
3022 connect_change = 1;
3023 } else {
3024 ret = -ENODEV;
3025 hub_port_disable(hub, i, 1);
3026 }
3027 dev_dbg (hub_dev,
3028 "resume on port %d, status %d\n",
3029 i, ret);
3030 }
3031
3032 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3033 dev_err (hub_dev,
3034 "over-current change on port %d\n",
3035 i);
3036 clear_port_feature(hdev, i,
3037 USB_PORT_FEAT_C_OVER_CURRENT);
3038 hub_power_on(hub);
3039 }
3040
3041 if (portchange & USB_PORT_STAT_C_RESET) {
3042 dev_dbg (hub_dev,
3043 "reset change on port %d\n",
3044 i);
3045 clear_port_feature(hdev, i,
3046 USB_PORT_FEAT_C_RESET);
3047 }
3048
3049 if (connect_change)
3050 hub_port_connect_change(hub, i,
3051 portstatus, portchange);
3052 } /* end for i */
3053
3054 /* deal with hub status changes */
3055 if (test_and_clear_bit(0, hub->event_bits) == 0)
3056 ; /* do nothing */
3057 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3058 dev_err (hub_dev, "get_hub_status failed\n");
3059 else {
3060 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3061 dev_dbg (hub_dev, "power change\n");
3062 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 3063 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3064 /* FIXME: Is this always true? */
55c52718 3065 hub->limited_power = 1;
403fae78 3066 else
3067 hub->limited_power = 0;
1da177e4
LT		 3068 }
3069 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3070 dev_dbg (hub_dev, "overcurrent change\n");
3071 msleep(500); /* Cool down */
3072 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3073 hub_power_on(hub);
3074 }
3075 }
3076
40f122f3
AS		 3077loop_autopm:
3078 /* Allow autosuspend if we're not going to run again */
3079 if (list_empty(&hub->event_list))
3080 usb_autopm_enable(intf);
1da177e4
LT		 3081loop:
3082 usb_unlock_device(hdev);
e8054854 3083 kref_put(&hub->kref, hub_release);
1da177e4
LT		 3084
3085 } /* end while (1) */
3086}
3087
3088static int hub_thread(void *__unused)
3089{
3bb1af52
AS		 3090 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3091 * port handover. Otherwise it might see that a full-speed device
3092 * was gone before the EHCI controller had handed its port over to
3093 * the companion full-speed controller.
3094 */
83144186 3095 set_freezable();
3bb1af52 3096
1da177e4
LT		 3097 do {
3098 hub_events();
e42837bc 3099 wait_event_freezable(khubd_wait,
9c8d6178
AM		 3100 !list_empty(&hub_event_list) ||
3101 kthread_should_stop());
9c8d6178 3102 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 3103
9c8d6178
AM		 3104 pr_debug("%s: khubd exiting\n", usbcore_name);
3105 return 0;
1da177e4
LT		 3106}
3107
3108static struct usb_device_id hub_id_table [] = {
3109 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3110 .bDeviceClass = USB_CLASS_HUB},
3111 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3112 .bInterfaceClass = USB_CLASS_HUB},
3113 { } /* Terminating entry */
3114};
3115
3116MODULE_DEVICE_TABLE (usb, hub_id_table);
3117
3118static struct usb_driver hub_driver = {
1da177e4
LT		 3119 .name = "hub",
3120 .probe = hub_probe,
3121 .disconnect = hub_disconnect,
3122 .suspend = hub_suspend,
3123 .resume = hub_resume,
f07600cf 3124 .reset_resume = hub_reset_resume,
7de18d8b
AS		 3125 .pre_reset = hub_pre_reset,
3126 .post_reset = hub_post_reset,
1da177e4
LT		 3127 .ioctl = hub_ioctl,
3128 .id_table = hub_id_table,
40f122f3 3129 .supports_autosuspend = 1,
1da177e4
LT		 3130};
3131
3132int usb_hub_init(void)
3133{
1da177e4
LT		 3134 if (usb_register(&hub_driver) < 0) {
3135 printk(KERN_ERR "%s: can't register hub driver\n",
3136 usbcore_name);
3137 return -1;
3138 }
3139
9c8d6178
AM		 3140 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3141 if (!IS_ERR(khubd_task))
1da177e4 3142 return 0;
1da177e4
LT		 3143
3144 /* Fall through if kernel_thread failed */
3145 usb_deregister(&hub_driver);
3146 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3147
3148 return -1;
3149}
3150
3151void usb_hub_cleanup(void)
3152{
9c8d6178 3153 kthread_stop(khubd_task);
1da177e4
LT		 3154
3155 /*
3156 * Hub resources are freed for us by usb_deregister. It calls
3157 * usb_driver_purge on every device which in turn calls that
3158 * devices disconnect function if it is using this driver.
3159 * The hub_disconnect function takes care of releasing the
3160 * individual hub resources. -greg
3161 */
3162 usb_deregister(&hub_driver);
3163} /* usb_hub_cleanup() */
3164
eb764c4b
AS		 3165static int descriptors_changed(struct usb_device *udev,
3166 struct usb_device_descriptor *old_device_descriptor)
3167{
3168 int changed = 0;
3169 unsigned index;
3170 unsigned serial_len = 0;
3171 unsigned len;
3172 unsigned old_length;
3173 int length;
3174 char *buf;
3175
3176 if (memcmp(&udev->descriptor, old_device_descriptor,
3177 sizeof(*old_device_descriptor)) != 0)
3178 return 1;
3179
3180 /* Since the idVendor, idProduct, and bcdDevice values in the
3181 * device descriptor haven't changed, we will assume the
3182 * Manufacturer and Product strings haven't changed either.
3183 * But the SerialNumber string could be different (e.g., a
3184 * different flash card of the same brand).
3185 */
3186 if (udev->serial)
3187 serial_len = strlen(udev->serial) + 1;
1da177e4 3188
eb764c4b 3189 len = serial_len;
1da177e4 3190 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b
AS		 3191 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3192 len = max(len, old_length);
1da177e4 3193 }
eb764c4b 3194
0cc1a51f 3195 buf = kmalloc(len, GFP_NOIO);
1da177e4
LT		 3196 if (buf == NULL) {
3197 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3198 /* assume the worst */
3199 return 1;
3200 }
3201 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b 3202 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
1da177e4
LT		 3203 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3204 old_length);
eb764c4b 3205 if (length != old_length) {
1da177e4
LT		 3206 dev_dbg(&udev->dev, "config index %d, error %d\n",
3207 index, length);
eb764c4b 3208 changed = 1;
1da177e4
LT		 3209 break;
3210 }
3211 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3212 != 0) {
3213 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
eb764c4b
AS		 3214 index,
3215 ((struct usb_config_descriptor *) buf)->
3216 bConfigurationValue);
3217 changed = 1;
1da177e4
LT		 3218 break;
3219 }
3220 }
eb764c4b
AS		 3221
3222 if (!changed && serial_len) {
3223 length = usb_string(udev, udev->descriptor.iSerialNumber,
3224 buf, serial_len);
3225 if (length + 1 != serial_len) {
3226 dev_dbg(&udev->dev, "serial string error %d\n",
3227 length);
3228 changed = 1;
3229 } else if (memcmp(buf, udev->serial, length) != 0) {
3230 dev_dbg(&udev->dev, "serial string changed\n");
3231 changed = 1;
3232 }
3233 }
3234
1da177e4 3235 kfree(buf);
eb764c4b 3236 return changed;
1da177e4
LT		 3237}
3238
3239/**
742120c6 3240 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
1da177e4
LT		 3241 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3242 *
79efa097
AS		 3243 * WARNING - don't use this routine to reset a composite device
3244 * (one with multiple interfaces owned by separate drivers)!
742120c6 3245 * Use usb_reset_device() instead.
1da177e4
LT		 3246 *
3247 * Do a port reset, reassign the device's address, and establish its
3248 * former operating configuration. If the reset fails, or the device's
3249 * descriptors change from their values before the reset, or the original
3250 * configuration and altsettings cannot be restored, a flag will be set
3251 * telling khubd to pretend the device has been disconnected and then
3252 * re-connected. All drivers will be unbound, and the device will be
3253 * re-enumerated and probed all over again.
3254 *
3255 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3256 * flagged for logical disconnection, or some other negative error code
3257 * if the reset wasn't even attempted.
3258 *
3259 * The caller must own the device lock. For example, it's safe to use
3260 * this from a driver probe() routine after downloading new firmware.
3261 * For calls that might not occur during probe(), drivers should lock
3262 * the device using usb_lock_device_for_reset().
6bc6cff5
AS		 3263 *
3264 * Locking exception: This routine may also be called from within an
3265 * autoresume handler. Such usage won't conflict with other tasks
3266 * holding the device lock because these tasks should always call
3267 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4 3268 */
742120c6 3269static int usb_reset_and_verify_device(struct usb_device *udev)
1da177e4
LT		 3270{
3271 struct usb_device *parent_hdev = udev->parent;
3272 struct usb_hub *parent_hub;
3273 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 3274 int i, ret = 0;
3275 int port1 = udev->portnum;
1da177e4
LT		 3276
3277 if (udev->state == USB_STATE_NOTATTACHED ||
3278 udev->state == USB_STATE_SUSPENDED) {
3279 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3280 udev->state);
3281 return -EINVAL;
3282 }
3283
3284 if (!parent_hdev) {
3285 /* this requires hcd-specific logic; see OHCI hc_restart() */
441b62c1 3286 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
1da177e4
LT		 3287 return -EISDIR;
3288 }
1da177e4
LT		 3289 parent_hub = hdev_to_hub(parent_hdev);
3290
1da177e4
LT		 3291 set_bit(port1, parent_hub->busy_bits);
3292 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3293
3294 /* ep0 maxpacket size may change; let the HCD know about it.
3295 * Other endpoints will be handled by re-enumeration. */
fc721f51 3296 usb_ep0_reinit(udev);
1da177e4 3297 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 3298 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT		 3299 break;
3300 }
3301 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b 3302
1da177e4
LT		 3303 if (ret < 0)
3304 goto re_enumerate;
3305
3306 /* Device might have changed firmware (DFU or similar) */
eb764c4b 3307 if (descriptors_changed(udev, &descriptor)) {
1da177e4
LT		 3308 dev_info(&udev->dev, "device firmware changed\n");
3309 udev->descriptor = descriptor; /* for disconnect() calls */
3310 goto re_enumerate;
3311 }
3312
3313 if (!udev->actconfig)
3314 goto done;
3315
3316 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3317 USB_REQ_SET_CONFIGURATION, 0,
3318 udev->actconfig->desc.bConfigurationValue, 0,
3319 NULL, 0, USB_CTRL_SET_TIMEOUT);
3320 if (ret < 0) {
3321 dev_err(&udev->dev,
3322 "can't restore configuration #%d (error=%d)\n",
3323 udev->actconfig->desc.bConfigurationValue, ret);
3324 goto re_enumerate;
3325 }
3326 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3327
3328 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3329 struct usb_interface *intf = udev->actconfig->interface[i];
3330 struct usb_interface_descriptor *desc;
3331
3332 /* set_interface resets host side toggle even
3333 * for altsetting zero. the interface may have no driver.
3334 */
3335 desc = &intf->cur_altsetting->desc;
3336 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3337 desc->bAlternateSetting);
3338 if (ret < 0) {
3339 dev_err(&udev->dev, "failed to restore interface %d "
3340 "altsetting %d (error=%d)\n",
3341 desc->bInterfaceNumber,
3342 desc->bAlternateSetting,
3343 ret);
3344 goto re_enumerate;
3345 }
3346 }
3347
3348done:
1da177e4
LT		 3349 return 0;
3350
3351re_enumerate:
3352 hub_port_logical_disconnect(parent_hub, port1);
3353 return -ENODEV;
3354}
79efa097
AS		 3355
3356/**
742120c6 3357 * usb_reset_device - warn interface drivers and perform a USB port reset
79efa097 3358 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
79efa097
AS		 3359 *
3360 * Warns all drivers bound to registered interfaces (using their pre_reset
3361 * method), performs the port reset, and then lets the drivers know that
3362 * the reset is over (using their post_reset method).
3363 *
742120c6 3364 * Return value is the same as for usb_reset_and_verify_device().
79efa097
AS		 3365 *
3366 * The caller must own the device lock. For example, it's safe to use
3367 * this from a driver probe() routine after downloading new firmware.
3368 * For calls that might not occur during probe(), drivers should lock
3369 * the device using usb_lock_device_for_reset().
78d9a487
AS		 3370 *
3371 * If an interface is currently being probed or disconnected, we assume
3372 * its driver knows how to handle resets. For all other interfaces,
3373 * if the driver doesn't have pre_reset and post_reset methods then
3374 * we attempt to unbind it and rebind afterward.
79efa097 3375 */
742120c6 3376int usb_reset_device(struct usb_device *udev)
79efa097
AS		 3377{
3378 int ret;
852c4b43 3379 int i;
79efa097
AS		 3380 struct usb_host_config *config = udev->actconfig;
3381
3382 if (udev->state == USB_STATE_NOTATTACHED ||
3383 udev->state == USB_STATE_SUSPENDED) {
3384 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3385 udev->state);
3386 return -EINVAL;
3387 }
3388
645daaab 3389 /* Prevent autosuspend during the reset */
94fcda1f 3390 usb_autoresume_device(udev);
645daaab 3391
79efa097 3392 if (config) {
79efa097 3393 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
852c4b43
AS		 3394 struct usb_interface *cintf = config->interface[i];
3395 struct usb_driver *drv;
78d9a487 3396 int unbind = 0;
852c4b43
AS		 3397
3398 if (cintf->dev.driver) {
79efa097 3399 drv = to_usb_driver(cintf->dev.driver);
78d9a487
AS		 3400 if (drv->pre_reset && drv->post_reset)
3401 unbind = (drv->pre_reset)(cintf);
3402 else if (cintf->condition ==
3403 USB_INTERFACE_BOUND)
3404 unbind = 1;
3405 if (unbind)
3406 usb_forced_unbind_intf(cintf);
79efa097
AS		 3407 }
3408 }
3409 }
3410
742120c6 3411 ret = usb_reset_and_verify_device(udev);
79efa097
AS		 3412
3413 if (config) {
79efa097 3414 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
852c4b43
AS		 3415 struct usb_interface *cintf = config->interface[i];
3416 struct usb_driver *drv;
78d9a487 3417 int rebind = cintf->needs_binding;
852c4b43 3418
78d9a487 3419 if (!rebind && cintf->dev.driver) {
79efa097
AS		 3420 drv = to_usb_driver(cintf->dev.driver);
3421 if (drv->post_reset)
78d9a487
AS		 3422 rebind = (drv->post_reset)(cintf);
3423 else if (cintf->condition ==
3424 USB_INTERFACE_BOUND)
3425 rebind = 1;
79efa097 3426 }
78d9a487
AS		 3427 if (rebind)
3428 usb_rebind_intf(cintf);
79efa097
AS		 3429 }
3430 }
3431
94fcda1f 3432 usb_autosuspend_device(udev);
79efa097
AS		 3433 return ret;
3434}
742120c6 3435EXPORT_SYMBOL_GPL(usb_reset_device);
kernel source for telekom puls (alcatel/mediatek)