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USB: usb-serial: fix a sparse warning about different signedness
[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
404d5b18 138static inline char *portspeed(int portstatus)
1da177e4
LT		 139{
140 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
141 return "480 Mb/s";
142 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
143 return "1.5 Mb/s";
144 else
145 return "12 Mb/s";
146}
1da177e4
LT		 147
148/* Note that hdev or one of its children must be locked! */
149static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
150{
151 return usb_get_intfdata(hdev->actconfig->interface[0]);
152}
153
154/* USB 2.0 spec Section 11.24.4.5 */
155static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
156{
157 int i, ret;
158
159 for (i = 0; i < 3; i++) {
160 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
161 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
162 USB_DT_HUB << 8, 0, data, size,
163 USB_CTRL_GET_TIMEOUT);
164 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
165 return ret;
166 }
167 return -EINVAL;
168}
169
170/*
171 * USB 2.0 spec Section 11.24.2.1
172 */
173static int clear_hub_feature(struct usb_device *hdev, int feature)
174{
175 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
176 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
177}
178
179/*
180 * USB 2.0 spec Section 11.24.2.2
181 */
182static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
183{
184 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
185 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
186 NULL, 0, 1000);
187}
188
189/*
190 * USB 2.0 spec Section 11.24.2.13
191 */
192static int set_port_feature(struct usb_device *hdev, int port1, int feature)
193{
194 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
195 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
196 NULL, 0, 1000);
197}
198
199/*
200 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
201 * for info about using port indicators
202 */
203static void set_port_led(
204 struct usb_hub *hub,
205 int port1,
206 int selector
207)
208{
209 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
210 USB_PORT_FEAT_INDICATOR);
211 if (status < 0)
212 dev_dbg (hub->intfdev,
213 "port %d indicator %s status %d\n",
214 port1,
215 ({ char *s; switch (selector) {
216 case HUB_LED_AMBER: s = "amber"; break;
217 case HUB_LED_GREEN: s = "green"; break;
218 case HUB_LED_OFF: s = "off"; break;
219 case HUB_LED_AUTO: s = "auto"; break;
220 default: s = "??"; break;
221 }; s; }),
222 status);
223}
224
225#define LED_CYCLE_PERIOD ((2*HZ)/3)
226
c4028958 227static void led_work (struct work_struct *work)
1da177e4 228{
c4028958
DH		 229 struct usb_hub *hub =
230 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 231 struct usb_device *hdev = hub->hdev;
232 unsigned i;
233 unsigned changed = 0;
234 int cursor = -1;
235
236 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
237 return;
238
239 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
240 unsigned selector, mode;
241
242 /* 30%-50% duty cycle */
243
244 switch (hub->indicator[i]) {
245 /* cycle marker */
246 case INDICATOR_CYCLE:
247 cursor = i;
248 selector = HUB_LED_AUTO;
249 mode = INDICATOR_AUTO;
250 break;
251 /* blinking green = sw attention */
252 case INDICATOR_GREEN_BLINK:
253 selector = HUB_LED_GREEN;
254 mode = INDICATOR_GREEN_BLINK_OFF;
255 break;
256 case INDICATOR_GREEN_BLINK_OFF:
257 selector = HUB_LED_OFF;
258 mode = INDICATOR_GREEN_BLINK;
259 break;
260 /* blinking amber = hw attention */
261 case INDICATOR_AMBER_BLINK:
262 selector = HUB_LED_AMBER;
263 mode = INDICATOR_AMBER_BLINK_OFF;
264 break;
265 case INDICATOR_AMBER_BLINK_OFF:
266 selector = HUB_LED_OFF;
267 mode = INDICATOR_AMBER_BLINK;
268 break;
269 /* blink green/amber = reserved */
270 case INDICATOR_ALT_BLINK:
271 selector = HUB_LED_GREEN;
272 mode = INDICATOR_ALT_BLINK_OFF;
273 break;
274 case INDICATOR_ALT_BLINK_OFF:
275 selector = HUB_LED_AMBER;
276 mode = INDICATOR_ALT_BLINK;
277 break;
278 default:
279 continue;
280 }
281 if (selector != HUB_LED_AUTO)
282 changed = 1;
283 set_port_led(hub, i + 1, selector);
284 hub->indicator[i] = mode;
285 }
286 if (!changed && blinkenlights) {
287 cursor++;
288 cursor %= hub->descriptor->bNbrPorts;
289 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
290 hub->indicator[cursor] = INDICATOR_CYCLE;
291 changed++;
292 }
293 if (changed)
294 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
295}
296
297/* use a short timeout for hub/port status fetches */
298#define USB_STS_TIMEOUT 1000
299#define USB_STS_RETRIES 5
300
301/*
302 * USB 2.0 spec Section 11.24.2.6
303 */
304static int get_hub_status(struct usb_device *hdev,
305 struct usb_hub_status *data)
306{
307 int i, status = -ETIMEDOUT;
308
309 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
310 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
311 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
312 data, sizeof(*data), USB_STS_TIMEOUT);
313 }
314 return status;
315}
316
317/*
318 * USB 2.0 spec Section 11.24.2.7
319 */
320static int get_port_status(struct usb_device *hdev, int port1,
321 struct usb_port_status *data)
322{
323 int i, status = -ETIMEDOUT;
324
325 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
326 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
327 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
328 data, sizeof(*data), USB_STS_TIMEOUT);
329 }
330 return status;
331}
332
3eb14915
AS		 333static int hub_port_status(struct usb_hub *hub, int port1,
334 u16 *status, u16 *change)
335{
336 int ret;
337
338 mutex_lock(&hub->status_mutex);
339 ret = get_port_status(hub->hdev, port1, &hub->status->port);
340 if (ret < 4) {
341 dev_err(hub->intfdev,
342 "%s failed (err = %d)\n", __func__, ret);
343 if (ret >= 0)
344 ret = -EIO;
345 } else {
346 *status = le16_to_cpu(hub->status->port.wPortStatus);
347 *change = le16_to_cpu(hub->status->port.wPortChange);
348 ret = 0;
349 }
350 mutex_unlock(&hub->status_mutex);
351 return ret;
352}
353
1da177e4
LT		 354static void kick_khubd(struct usb_hub *hub)
355{
356 unsigned long flags;
357
40f122f3
AS		 358 /* Suppress autosuspend until khubd runs */
359 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
360
1da177e4 361 spin_lock_irqsave(&hub_event_lock, flags);
2e2c5eea 362 if (!hub->disconnected && list_empty(&hub->event_list)) {
1da177e4
LT		 363 list_add_tail(&hub->event_list, &hub_event_list);
364 wake_up(&khubd_wait);
365 }
366 spin_unlock_irqrestore(&hub_event_lock, flags);
367}
368
369void usb_kick_khubd(struct usb_device *hdev)
370{
e8054854 371 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT		 372 kick_khubd(hdev_to_hub(hdev));
373}
374
375
376/* completion function, fires on port status changes and various faults */
7d12e780 377static void hub_irq(struct urb *urb)
1da177e4 378{
ec17cf1c 379 struct usb_hub *hub = urb->context;
e015268d 380 int status = urb->status;
1da177e4
LT		 381 int i;
382 unsigned long bits;
383
e015268d 384 switch (status) {
1da177e4
LT		 385 case -ENOENT: /* synchronous unlink */
386 case -ECONNRESET: /* async unlink */
387 case -ESHUTDOWN: /* hardware going away */
388 return;
389
390 default: /* presumably an error */
391 /* Cause a hub reset after 10 consecutive errors */
e015268d 392 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
1da177e4
LT		 393 if ((++hub->nerrors < 10) || hub->error)
394 goto resubmit;
e015268d 395 hub->error = status;
1da177e4 396 /* FALL THROUGH */
ec17cf1c 397
1da177e4
LT		 398 /* let khubd handle things */
399 case 0: /* we got data: port status changed */
400 bits = 0;
401 for (i = 0; i < urb->actual_length; ++i)
402 bits |= ((unsigned long) ((*hub->buffer)[i]))
403 << (i*8);
404 hub->event_bits[0] = bits;
405 break;
406 }
407
408 hub->nerrors = 0;
409
410 /* Something happened, let khubd figure it out */
411 kick_khubd(hub);
412
413resubmit:
414 if (hub->quiescing)
415 return;
416
417 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
418 && status != -ENODEV && status != -EPERM)
419 dev_err (hub->intfdev, "resubmit --> %d\n", status);
420}
421
422/* USB 2.0 spec Section 11.24.2.3 */
423static inline int
424hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
425{
426 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
427 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
428 tt, NULL, 0, 1000);
429}
430
431/*
432 * enumeration blocks khubd for a long time. we use keventd instead, since
433 * long blocking there is the exception, not the rule. accordingly, HCDs
434 * talking to TTs must queue control transfers (not just bulk and iso), so
435 * both can talk to the same hub concurrently.
436 */
c4028958 437static void hub_tt_kevent (struct work_struct *work)
1da177e4 438{
c4028958
DH		 439 struct usb_hub *hub =
440 container_of(work, struct usb_hub, tt.kevent);
1da177e4 441 unsigned long flags;
55e5fdfa 442 int limit = 100;
1da177e4
LT		 443
444 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 445 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT		 446 struct list_head *temp;
447 struct usb_tt_clear *clear;
448 struct usb_device *hdev = hub->hdev;
449 int status;
450
451 temp = hub->tt.clear_list.next;
452 clear = list_entry (temp, struct usb_tt_clear, clear_list);
453 list_del (&clear->clear_list);
454
455 /* drop lock so HCD can concurrently report other TT errors */
456 spin_unlock_irqrestore (&hub->tt.lock, flags);
457 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
458 spin_lock_irqsave (&hub->tt.lock, flags);
459
460 if (status)
461 dev_err (&hdev->dev,
462 "clear tt %d (%04x) error %d\n",
463 clear->tt, clear->devinfo, status);
1bc3c9e1 464 kfree(clear);
1da177e4
LT		 465 }
466 spin_unlock_irqrestore (&hub->tt.lock, flags);
467}
468
469/**
470 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
471 * @udev: the device whose split transaction failed
472 * @pipe: identifies the endpoint of the failed transaction
473 *
474 * High speed HCDs use this to tell the hub driver that some split control or
475 * bulk transaction failed in a way that requires clearing internal state of
476 * a transaction translator. This is normally detected (and reported) from
477 * interrupt context.
478 *
479 * It may not be possible for that hub to handle additional full (or low)
480 * speed transactions until that state is fully cleared out.
481 */
482void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
483{
484 struct usb_tt *tt = udev->tt;
485 unsigned long flags;
486 struct usb_tt_clear *clear;
487
488 /* we've got to cope with an arbitrary number of pending TT clears,
489 * since each TT has "at least two" buffers that can need it (and
490 * there can be many TTs per hub). even if they're uncommon.
491 */
54e6ecb2 492 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 493 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
494 /* FIXME recover somehow ... RESET_TT? */
495 return;
496 }
497
498 /* info that CLEAR_TT_BUFFER needs */
499 clear->tt = tt->multi ? udev->ttport : 1;
500 clear->devinfo = usb_pipeendpoint (pipe);
501 clear->devinfo |= udev->devnum << 4;
502 clear->devinfo |= usb_pipecontrol (pipe)
503 ? (USB_ENDPOINT_XFER_CONTROL << 11)
504 : (USB_ENDPOINT_XFER_BULK << 11);
505 if (usb_pipein (pipe))
506 clear->devinfo |= 1 << 15;
507
508 /* tell keventd to clear state for this TT */
509 spin_lock_irqsave (&tt->lock, flags);
510 list_add_tail (&clear->clear_list, &tt->clear_list);
511 schedule_work (&tt->kevent);
512 spin_unlock_irqrestore (&tt->lock, flags);
513}
782e70c6 514EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
1da177e4
LT		 515
516static void hub_power_on(struct usb_hub *hub)
517{
518 int port1;
b789696a 519 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 520 u16 wHubCharacteristics =
521 le16_to_cpu(hub->descriptor->wHubCharacteristics);
522
523 /* Enable power on each port. Some hubs have reserved values
524 * of LPSM (> 2) in their descriptors, even though they are
525 * USB 2.0 hubs. Some hubs do not implement port-power switching
526 * but only emulate it. In all cases, the ports won't work
527 * unless we send these messages to the hub.
528 */
529 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 530 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 531 else
532 dev_dbg(hub->intfdev, "trying to enable port power on "
533 "non-switchable hub\n");
534 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
535 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 536
b789696a
DB		 537 /* Wait at least 100 msec for power to become stable */
538 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 539}
540
1da177e4
LT		 541static int hub_hub_status(struct usb_hub *hub,
542 u16 *status, u16 *change)
543{
544 int ret;
545
db90e7a1 546 mutex_lock(&hub->status_mutex);
1da177e4
LT		 547 ret = get_hub_status(hub->hdev, &hub->status->hub);
548 if (ret < 0)
549 dev_err (hub->intfdev,
441b62c1 550 "%s failed (err = %d)\n", __func__, ret);
1da177e4
LT		 551 else {
552 *status = le16_to_cpu(hub->status->hub.wHubStatus);
553 *change = le16_to_cpu(hub->status->hub.wHubChange);
554 ret = 0;
555 }
db90e7a1 556 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 557 return ret;
558}
559
8b28c752
AS		 560static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
561{
562 struct usb_device *hdev = hub->hdev;
0458d5b4 563 int ret = 0;
8b28c752 564
0458d5b4 565 if (hdev->children[port1-1] && set_state)
8b28c752
AS		 566 usb_set_device_state(hdev->children[port1-1],
567 USB_STATE_NOTATTACHED);
0458d5b4
AS		 568 if (!hub->error)
569 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS		 570 if (ret)
571 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 572 port1, ret);
8b28c752
AS		 573 return ret;
574}
575
0458d5b4
AS		 576/*
577 * Disable a port and mark a logical connnect-change event, so that some
578 * time later khubd will disconnect() any existing usb_device on the port
579 * and will re-enumerate if there actually is a device attached.
580 */
581static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
582{
583 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
584 hub_port_disable(hub, port1, 1);
7d069b7d 585
0458d5b4
AS		 586 /* FIXME let caller ask to power down the port:
587 * - some devices won't enumerate without a VBUS power cycle
588 * - SRP saves power that way
589 * - ... new call, TBD ...
590 * That's easy if this hub can switch power per-port, and
591 * khubd reactivates the port later (timer, SRP, etc).
592 * Powerdown must be optional, because of reset/DFU.
593 */
594
595 set_bit(port1, hub->change_bits);
596 kick_khubd(hub);
597}
598
6ee0b270
AS		 599enum hub_activation_type {
600 HUB_INIT, HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME
601};
5e6effae 602
f2835219 603static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
5e6effae
AS		 604{
605 struct usb_device *hdev = hub->hdev;
606 int port1;
f2835219 607 int status;
948fea37 608 bool need_debounce_delay = false;
5e6effae 609
f2835219
AS		 610 /* After a resume, port power should still be on.
611 * For any other type of activation, turn it on.
612 */
613 if (type != HUB_RESUME)
614 hub_power_on(hub);
615
6ee0b270
AS		 616 /* Check each port and set hub->change_bits to let khubd know
617 * which ports need attention.
5e6effae
AS		 618 */
619 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
620 struct usb_device *udev = hdev->children[port1-1];
5e6effae
AS		 621 u16 portstatus, portchange;
622
6ee0b270
AS		 623 portstatus = portchange = 0;
624 status = hub_port_status(hub, port1, &portstatus, &portchange);
625 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
626 dev_dbg(hub->intfdev,
627 "port %d: status %04x change %04x\n",
628 port1, portstatus, portchange);
629
630 /* After anything other than HUB_RESUME (i.e., initialization
631 * or any sort of reset), every port should be disabled.
632 * Unconnected ports should likewise be disabled (paranoia),
633 * and so should ports for which we have no usb_device.
634 */
635 if ((portstatus & USB_PORT_STAT_ENABLE) && (
636 type != HUB_RESUME ||
637 !(portstatus & USB_PORT_STAT_CONNECTION) ||
638 !udev ||
639 udev->state == USB_STATE_NOTATTACHED)) {
640 clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
641 portstatus &= ~USB_PORT_STAT_ENABLE;
5e6effae
AS		 642 }
643
948fea37
AS		 644 /* Clear status-change flags; we'll debounce later */
645 if (portchange & USB_PORT_STAT_C_CONNECTION) {
646 need_debounce_delay = true;
647 clear_port_feature(hub->hdev, port1,
648 USB_PORT_FEAT_C_CONNECTION);
649 }
650 if (portchange & USB_PORT_STAT_C_ENABLE) {
651 need_debounce_delay = true;
652 clear_port_feature(hub->hdev, port1,
653 USB_PORT_FEAT_C_ENABLE);
654 }
655
6ee0b270
AS		 656 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
657 /* Tell khubd to disconnect the device or
658 * check for a new connection
659 */
660 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
661 set_bit(port1, hub->change_bits);
662
663 } else if (portstatus & USB_PORT_STAT_ENABLE) {
664 /* The power session apparently survived the resume.
665 * If there was an overcurrent or suspend change
666 * (i.e., remote wakeup request), have khubd
667 * take care of it.
668 */
669 if (portchange)
670 set_bit(port1, hub->change_bits);
5e6effae 671
6ee0b270 672 } else if (udev->persist_enabled) {
6ee0b270 673#ifdef CONFIG_PM
5e6effae 674 udev->reset_resume = 1;
6ee0b270 675#endif
8808f00c
AS		 676 set_bit(port1, hub->change_bits);
677
6ee0b270
AS		 678 } else {
679 /* The power session is gone; tell khubd */
680 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
681 set_bit(port1, hub->change_bits);
5e6effae 682 }
5e6effae
AS		 683 }
684
948fea37
AS		 685 /* If no port-status-change flags were set, we don't need any
686 * debouncing. If flags were set we can try to debounce the
687 * ports all at once right now, instead of letting khubd do them
688 * one at a time later on.
689 *
690 * If any port-status changes do occur during this delay, khubd
691 * will see them later and handle them normally.
692 */
693 if (need_debounce_delay)
694 msleep(HUB_DEBOUNCE_STABLE);
f2835219
AS		 695
696 hub->quiescing = 0;
697
698 status = usb_submit_urb(hub->urb, GFP_NOIO);
699 if (status < 0)
700 dev_err(hub->intfdev, "activate --> %d\n", status);
701 if (hub->has_indicators && blinkenlights)
702 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
703
704 /* Scan all ports that need attention */
705 kick_khubd(hub);
5e6effae
AS		 706}
707
4330354f
AS		 708enum hub_quiescing_type {
709 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
710};
711
712static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
713{
714 struct usb_device *hdev = hub->hdev;
715 int i;
716
717 /* khubd and related activity won't re-trigger */
718 hub->quiescing = 1;
719
720 if (type != HUB_SUSPEND) {
721 /* Disconnect all the children */
722 for (i = 0; i < hdev->maxchild; ++i) {
723 if (hdev->children[i])
724 usb_disconnect(&hdev->children[i]);
725 }
726 }
727
728 /* Stop khubd and related activity */
729 usb_kill_urb(hub->urb);
730 if (hub->has_indicators)
731 cancel_delayed_work_sync(&hub->leds);
732 if (hub->tt.hub)
733 cancel_work_sync(&hub->tt.kevent);
734}
735
3eb14915
AS		 736/* caller has locked the hub device */
737static int hub_pre_reset(struct usb_interface *intf)
738{
739 struct usb_hub *hub = usb_get_intfdata(intf);
740
4330354f 741 hub_quiesce(hub, HUB_PRE_RESET);
f07600cf 742 return 0;
7d069b7d
AS		 743}
744
745/* caller has locked the hub device */
f07600cf 746static int hub_post_reset(struct usb_interface *intf)
7d069b7d 747{
7de18d8b
AS		 748 struct usb_hub *hub = usb_get_intfdata(intf);
749
f2835219 750 hub_activate(hub, HUB_POST_RESET);
f07600cf 751 return 0;
7d069b7d
AS		 752}
753
1da177e4
LT		 754static int hub_configure(struct usb_hub *hub,
755 struct usb_endpoint_descriptor *endpoint)
756{
757 struct usb_device *hdev = hub->hdev;
758 struct device *hub_dev = hub->intfdev;
759 u16 hubstatus, hubchange;
74ad9bd2 760 u16 wHubCharacteristics;
1da177e4
LT		 761 unsigned int pipe;
762 int maxp, ret;
763 char *message;
764
765 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
766 &hub->buffer_dma);
767 if (!hub->buffer) {
768 message = "can't allocate hub irq buffer";
769 ret = -ENOMEM;
770 goto fail;
771 }
772
773 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
774 if (!hub->status) {
775 message = "can't kmalloc hub status buffer";
776 ret = -ENOMEM;
777 goto fail;
778 }
db90e7a1 779 mutex_init(&hub->status_mutex);
1da177e4
LT		 780
781 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
782 if (!hub->descriptor) {
783 message = "can't kmalloc hub descriptor";
784 ret = -ENOMEM;
785 goto fail;
786 }
787
788 /* Request the entire hub descriptor.
789 * hub->descriptor can handle USB_MAXCHILDREN ports,
790 * but the hub can/will return fewer bytes here.
791 */
792 ret = get_hub_descriptor(hdev, hub->descriptor,
793 sizeof(*hub->descriptor));
794 if (ret < 0) {
795 message = "can't read hub descriptor";
796 goto fail;
797 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
798 message = "hub has too many ports!";
799 ret = -ENODEV;
800 goto fail;
801 }
802
803 hdev->maxchild = hub->descriptor->bNbrPorts;
804 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
805 (hdev->maxchild == 1) ? "" : "s");
806
74ad9bd2 807 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 808
74ad9bd2 809 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 810 int i;
811 char portstr [USB_MAXCHILDREN + 1];
812
813 for (i = 0; i < hdev->maxchild; i++)
814 portstr[i] = hub->descriptor->DeviceRemovable
815 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
816 ? 'F' : 'R';
817 portstr[hdev->maxchild] = 0;
818 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
819 } else
820 dev_dbg(hub_dev, "standalone hub\n");
821
74ad9bd2 822 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 823 case 0x00:
824 dev_dbg(hub_dev, "ganged power switching\n");
825 break;
826 case 0x01:
827 dev_dbg(hub_dev, "individual port power switching\n");
828 break;
829 case 0x02:
830 case 0x03:
831 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
832 break;
833 }
834
74ad9bd2 835 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 836 case 0x00:
837 dev_dbg(hub_dev, "global over-current protection\n");
838 break;
839 case 0x08:
840 dev_dbg(hub_dev, "individual port over-current protection\n");
841 break;
842 case 0x10:
843 case 0x18:
844 dev_dbg(hub_dev, "no over-current protection\n");
845 break;
846 }
847
848 spin_lock_init (&hub->tt.lock);
849 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 850 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 851 switch (hdev->descriptor.bDeviceProtocol) {
852 case 0:
853 break;
854 case 1:
855 dev_dbg(hub_dev, "Single TT\n");
856 hub->tt.hub = hdev;
857 break;
858 case 2:
859 ret = usb_set_interface(hdev, 0, 1);
860 if (ret == 0) {
861 dev_dbg(hub_dev, "TT per port\n");
862 hub->tt.multi = 1;
863 } else
864 dev_err(hub_dev, "Using single TT (err %d)\n",
865 ret);
866 hub->tt.hub = hdev;
867 break;
868 default:
869 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
870 hdev->descriptor.bDeviceProtocol);
871 break;
872 }
873
e09711ae 874 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 875 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 876 case HUB_TTTT_8_BITS:
877 if (hdev->descriptor.bDeviceProtocol != 0) {
878 hub->tt.think_time = 666;
879 dev_dbg(hub_dev, "TT requires at most %d "
880 "FS bit times (%d ns)\n",
881 8, hub->tt.think_time);
882 }
1da177e4 883 break;
e09711ae
DB		 884 case HUB_TTTT_16_BITS:
885 hub->tt.think_time = 666 * 2;
886 dev_dbg(hub_dev, "TT requires at most %d "
887 "FS bit times (%d ns)\n",
888 16, hub->tt.think_time);
1da177e4 889 break;
e09711ae
DB		 890 case HUB_TTTT_24_BITS:
891 hub->tt.think_time = 666 * 3;
892 dev_dbg(hub_dev, "TT requires at most %d "
893 "FS bit times (%d ns)\n",
894 24, hub->tt.think_time);
1da177e4 895 break;
e09711ae
DB		 896 case HUB_TTTT_32_BITS:
897 hub->tt.think_time = 666 * 4;
898 dev_dbg(hub_dev, "TT requires at most %d "
899 "FS bit times (%d ns)\n",
900 32, hub->tt.think_time);
1da177e4
LT		 901 break;
902 }
903
904 /* probe() zeroes hub->indicator[] */
74ad9bd2 905 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 906 hub->has_indicators = 1;
907 dev_dbg(hub_dev, "Port indicators are supported\n");
908 }
909
910 dev_dbg(hub_dev, "power on to power good time: %dms\n",
911 hub->descriptor->bPwrOn2PwrGood * 2);
912
913 /* power budgeting mostly matters with bus-powered hubs,
914 * and battery-powered root hubs (may provide just 8 mA).
915 */
916 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 917 if (ret < 2) {
1da177e4
LT		 918 message = "can't get hub status";
919 goto fail;
920 }
7d35b929
AS		 921 le16_to_cpus(&hubstatus);
922 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 923 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
924 hub->mA_per_port = 500;
925 else {
926 hub->mA_per_port = hdev->bus_mA;
927 hub->limited_power = 1;
928 }
7d35b929 929 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 930 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
931 hub->descriptor->bHubContrCurrent);
55c52718
AS		 932 hub->limited_power = 1;
933 if (hdev->maxchild > 0) {
934 int remaining = hdev->bus_mA -
935 hub->descriptor->bHubContrCurrent;
936
937 if (remaining < hdev->maxchild * 100)
938 dev_warn(hub_dev,
939 "insufficient power available "
940 "to use all downstream ports\n");
941 hub->mA_per_port = 100; /* 7.2.1.1 */
942 }
943 } else { /* Self-powered external hub */
944 /* FIXME: What about battery-powered external hubs that
945 * provide less current per port? */
946 hub->mA_per_port = 500;
7d35b929 947 }
55c52718
AS		 948 if (hub->mA_per_port < 500)
949 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
950 hub->mA_per_port);
1da177e4
LT		 951
952 ret = hub_hub_status(hub, &hubstatus, &hubchange);
953 if (ret < 0) {
954 message = "can't get hub status";
955 goto fail;
956 }
957
958 /* local power status reports aren't always correct */
959 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
960 dev_dbg(hub_dev, "local power source is %s\n",
961 (hubstatus & HUB_STATUS_LOCAL_POWER)
962 ? "lost (inactive)" : "good");
963
74ad9bd2 964 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 965 dev_dbg(hub_dev, "%sover-current condition exists\n",
966 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
967
88fafff9 968 /* set up the interrupt endpoint
969 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
970 * bytes as USB2.0[11.12.3] says because some hubs are known
971 * to send more data (and thus cause overflow). For root hubs,
972 * maxpktsize is defined in hcd.c's fake endpoint descriptors
973 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 974 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
975 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
976
977 if (maxp > sizeof(*hub->buffer))
978 maxp = sizeof(*hub->buffer);
979
980 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
981 if (!hub->urb) {
982 message = "couldn't allocate interrupt urb";
983 ret = -ENOMEM;
984 goto fail;
985 }
986
987 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
988 hub, endpoint->bInterval);
989 hub->urb->transfer_dma = hub->buffer_dma;
990 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
991
992 /* maybe cycle the hub leds */
993 if (hub->has_indicators && blinkenlights)
994 hub->indicator [0] = INDICATOR_CYCLE;
995
f2835219 996 hub_activate(hub, HUB_INIT);
1da177e4
LT		 997 return 0;
998
999fail:
1000 dev_err (hub_dev, "config failed, %s (err %d)\n",
1001 message, ret);
1002 /* hub_disconnect() frees urb and descriptor */
1003 return ret;
1004}
1005
e8054854
AS		 1006static void hub_release(struct kref *kref)
1007{
1008 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1009
1010 usb_put_intf(to_usb_interface(hub->intfdev));
1011 kfree(hub);
1012}
1013
1da177e4
LT		 1014static unsigned highspeed_hubs;
1015
1016static void hub_disconnect(struct usb_interface *intf)
1017{
1018 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS		 1019
1020 /* Take the hub off the event list and don't let it be added again */
1021 spin_lock_irq(&hub_event_lock);
1022 list_del_init(&hub->event_list);
1023 hub->disconnected = 1;
1024 spin_unlock_irq(&hub_event_lock);
1da177e4 1025
7de18d8b
AS		 1026 /* Disconnect all children and quiesce the hub */
1027 hub->error = 0;
4330354f 1028 hub_quiesce(hub, HUB_DISCONNECT);
7de18d8b 1029
8b28c752 1030 usb_set_intfdata (intf, NULL);
1da177e4 1031
e8054854 1032 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT		 1033 highspeed_hubs--;
1034
1da177e4 1035 usb_free_urb(hub->urb);
1bc3c9e1 1036 kfree(hub->descriptor);
1bc3c9e1 1037 kfree(hub->status);
e8054854
AS		 1038 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
1039 hub->buffer_dma);
1da177e4 1040
e8054854 1041 kref_put(&hub->kref, hub_release);
1da177e4
LT		 1042}
1043
1044static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1045{
1046 struct usb_host_interface *desc;
1047 struct usb_endpoint_descriptor *endpoint;
1048 struct usb_device *hdev;
1049 struct usb_hub *hub;
1050
1051 desc = intf->cur_altsetting;
1052 hdev = interface_to_usbdev(intf);
1053
38f3ad5e
FB		 1054 if (hdev->level == MAX_TOPO_LEVEL) {
1055 dev_err(&intf->dev, "Unsupported bus topology: "
1056 "hub nested too deep\n");
1057 return -E2BIG;
1058 }
1059
89ccbdc9
DB		 1060#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1061 if (hdev->parent) {
1062 dev_warn(&intf->dev, "ignoring external hub\n");
1063 return -ENODEV;
1064 }
1065#endif
1066
1da177e4
LT		 1067 /* Some hubs have a subclass of 1, which AFAICT according to the */
1068 /* specs is not defined, but it works */
1069 if ((desc->desc.bInterfaceSubClass != 0) &&
1070 (desc->desc.bInterfaceSubClass != 1)) {
1071descriptor_error:
1072 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1073 return -EIO;
1074 }
1075
1076 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1077 if (desc->desc.bNumEndpoints != 1)
1078 goto descriptor_error;
1079
1080 endpoint = &desc->endpoint[0].desc;
1081
fbf81c29
LFC		 1082 /* If it's not an interrupt in endpoint, we'd better punt! */
1083 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 1084 goto descriptor_error;
1085
1086 /* We found a hub */
1087 dev_info (&intf->dev, "USB hub found\n");
1088
0a1ef3b5 1089 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 1090 if (!hub) {
1091 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1092 return -ENOMEM;
1093 }
1094
e8054854 1095 kref_init(&hub->kref);
1da177e4
LT		 1096 INIT_LIST_HEAD(&hub->event_list);
1097 hub->intfdev = &intf->dev;
1098 hub->hdev = hdev;
c4028958 1099 INIT_DELAYED_WORK(&hub->leds, led_work);
e8054854 1100 usb_get_intf(intf);
1da177e4
LT		 1101
1102 usb_set_intfdata (intf, hub);
40f122f3 1103 intf->needs_remote_wakeup = 1;
1da177e4
LT		 1104
1105 if (hdev->speed == USB_SPEED_HIGH)
1106 highspeed_hubs++;
1107
1108 if (hub_configure(hub, endpoint) >= 0)
1109 return 0;
1110
1111 hub_disconnect (intf);
1112 return -ENODEV;
1113}
1114
1115static int
1116hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1117{
1118 struct usb_device *hdev = interface_to_usbdev (intf);
1119
1120 /* assert ifno == 0 (part of hub spec) */
1121 switch (code) {
1122 case USBDEVFS_HUB_PORTINFO: {
1123 struct usbdevfs_hub_portinfo *info = user_data;
1124 int i;
1125
1126 spin_lock_irq(&device_state_lock);
1127 if (hdev->devnum <= 0)
1128 info->nports = 0;
1129 else {
1130 info->nports = hdev->maxchild;
1131 for (i = 0; i < info->nports; i++) {
1132 if (hdev->children[i] == NULL)
1133 info->port[i] = 0;
1134 else
1135 info->port[i] =
1136 hdev->children[i]->devnum;
1137 }
1138 }
1139 spin_unlock_irq(&device_state_lock);
1140
1141 return info->nports + 1;
1142 }
1143
1144 default:
1145 return -ENOSYS;
1146 }
1147}
1148
1da177e4 1149
1da177e4
LT		 1150static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1151{
1152 int i;
1153
1154 for (i = 0; i < udev->maxchild; ++i) {
1155 if (udev->children[i])
1156 recursively_mark_NOTATTACHED(udev->children[i]);
1157 }
15123006 1158 if (udev->state == USB_STATE_SUSPENDED) {
ee49fb5d 1159 udev->discon_suspended = 1;
15123006
SS		 1160 udev->active_duration -= jiffies;
1161 }
1da177e4
LT		 1162 udev->state = USB_STATE_NOTATTACHED;
1163}
1164
1165/**
1166 * usb_set_device_state - change a device's current state (usbcore, hcds)
1167 * @udev: pointer to device whose state should be changed
1168 * @new_state: new state value to be stored
1169 *
1170 * udev->state is _not_ fully protected by the device lock. Although
1171 * most transitions are made only while holding the lock, the state can
1172 * can change to USB_STATE_NOTATTACHED at almost any time. This
1173 * is so that devices can be marked as disconnected as soon as possible,
1174 * without having to wait for any semaphores to be released. As a result,
1175 * all changes to any device's state must be protected by the
1176 * device_state_lock spinlock.
1177 *
1178 * Once a device has been added to the device tree, all changes to its state
1179 * should be made using this routine. The state should _not_ be set directly.
1180 *
1181 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1182 * Otherwise udev->state is set to new_state, and if new_state is
1183 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1184 * to USB_STATE_NOTATTACHED.
1185 */
1186void usb_set_device_state(struct usb_device *udev,
1187 enum usb_device_state new_state)
1188{
1189 unsigned long flags;
1190
1191 spin_lock_irqsave(&device_state_lock, flags);
1192 if (udev->state == USB_STATE_NOTATTACHED)
1193 ; /* do nothing */
b94dc6b5 1194 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1195
1196 /* root hub wakeup capabilities are managed out-of-band
1197 * and may involve silicon errata ... ignore them here.
1198 */
1199 if (udev->parent) {
645daaab
AS		 1200 if (udev->state == USB_STATE_SUSPENDED
1201 || new_state == USB_STATE_SUSPENDED)
1202 ; /* No change to wakeup settings */
1203 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1204 device_init_wakeup(&udev->dev,
1205 (udev->actconfig->desc.bmAttributes
1206 & USB_CONFIG_ATT_WAKEUP));
645daaab 1207 else
fb669cc0
DB		 1208 device_init_wakeup(&udev->dev, 0);
1209 }
15123006
SS		 1210 if (udev->state == USB_STATE_SUSPENDED &&
1211 new_state != USB_STATE_SUSPENDED)
1212 udev->active_duration -= jiffies;
1213 else if (new_state == USB_STATE_SUSPENDED &&
1214 udev->state != USB_STATE_SUSPENDED)
1215 udev->active_duration += jiffies;
645daaab 1216 udev->state = new_state;
b94dc6b5 1217 } else
1da177e4
LT		 1218 recursively_mark_NOTATTACHED(udev);
1219 spin_unlock_irqrestore(&device_state_lock, flags);
1220}
1da177e4 1221
8af548dc
IPG		 1222/*
1223 * WUSB devices are simple: they have no hubs behind, so the mapping
1224 * device <-> virtual port number becomes 1:1. Why? to simplify the
1225 * life of the device connection logic in
1226 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1227 * handshake we need to assign a temporary address in the unauthorized
1228 * space. For simplicity we use the first virtual port number found to
1229 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1230 * and that becomes it's address [X < 128] or its unauthorized address
1231 * [X | 0x80].
1232 *
1233 * We add 1 as an offset to the one-based USB-stack port number
1234 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1235 * 0 is reserved by USB for default address; (b) Linux's USB stack
1236 * uses always #1 for the root hub of the controller. So USB stack's
1237 * port #1, which is wusb virtual-port #0 has address #2.
1238 */
1da177e4
LT		 1239static void choose_address(struct usb_device *udev)
1240{
1241 int devnum;
1242 struct usb_bus *bus = udev->bus;
1243
1244 /* If khubd ever becomes multithreaded, this will need a lock */
8af548dc
IPG		 1245 if (udev->wusb) {
1246 devnum = udev->portnum + 1;
1247 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1248 } else {
1249 /* Try to allocate the next devnum beginning at
1250 * bus->devnum_next. */
1251 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1252 bus->devnum_next);
1253 if (devnum >= 128)
1254 devnum = find_next_zero_bit(bus->devmap.devicemap,
1255 128, 1);
1256 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1257 }
1da177e4
LT		 1258 if (devnum < 128) {
1259 set_bit(devnum, bus->devmap.devicemap);
1260 udev->devnum = devnum;
1261 }
1262}
1263
1264static void release_address(struct usb_device *udev)
1265{
1266 if (udev->devnum > 0) {
1267 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1268 udev->devnum = -1;
1269 }
1270}
1271
4953d141
DV		 1272static void update_address(struct usb_device *udev, int devnum)
1273{
1274 /* The address for a WUSB device is managed by wusbcore. */
1275 if (!udev->wusb)
1276 udev->devnum = devnum;
1277}
1278
d5d4db70
AS		 1279#ifdef CONFIG_USB_SUSPEND
1280
1281static void usb_stop_pm(struct usb_device *udev)
1282{
1283 /* Synchronize with the ksuspend thread to prevent any more
1284 * autosuspend requests from being submitted, and decrement
1285 * the parent's count of unsuspended children.
1286 */
1287 usb_pm_lock(udev);
1288 if (udev->parent && !udev->discon_suspended)
1289 usb_autosuspend_device(udev->parent);
1290 usb_pm_unlock(udev);
1291
1292 /* Stop any autosuspend requests already submitted */
1293 cancel_rearming_delayed_work(&udev->autosuspend);
1294}
1295
1296#else
1297
1298static inline void usb_stop_pm(struct usb_device *udev)
1299{ }
1300
1301#endif
1302
1da177e4
LT		 1303/**
1304 * usb_disconnect - disconnect a device (usbcore-internal)
1305 * @pdev: pointer to device being disconnected
1306 * Context: !in_interrupt ()
1307 *
1308 * Something got disconnected. Get rid of it and all of its children.
1309 *
1310 * If *pdev is a normal device then the parent hub must already be locked.
1311 * If *pdev is a root hub then this routine will acquire the
1312 * usb_bus_list_lock on behalf of the caller.
1313 *
1314 * Only hub drivers (including virtual root hub drivers for host
1315 * controllers) should ever call this.
1316 *
1317 * This call is synchronous, and may not be used in an interrupt context.
1318 */
1319void usb_disconnect(struct usb_device **pdev)
1320{
1321 struct usb_device *udev = *pdev;
1322 int i;
1323
1324 if (!udev) {
441b62c1 1325 pr_debug ("%s nodev\n", __func__);
1da177e4
LT		 1326 return;
1327 }
1328
1329 /* mark the device as inactive, so any further urb submissions for
1330 * this device (and any of its children) will fail immediately.
1331 * this quiesces everyting except pending urbs.
1332 */
1333 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1334 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1335
9ad3d6cc
AS		 1336 usb_lock_device(udev);
1337
1da177e4
LT		 1338 /* Free up all the children before we remove this device */
1339 for (i = 0; i < USB_MAXCHILDREN; i++) {
1340 if (udev->children[i])
1341 usb_disconnect(&udev->children[i]);
1342 }
1343
1344 /* deallocate hcd/hardware state ... nuking all pending urbs and
1345 * cleaning up all state associated with the current configuration
1346 * so that the hardware is now fully quiesced.
1347 */
782da727 1348 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1349 usb_disable_device(udev, 0);
1350
782da727
AS		 1351 usb_unlock_device(udev);
1352
e16362a0
AS		 1353 /* Remove the device-specific files from sysfs. This must be
1354 * done with udev unlocked, because some of the attribute
1355 * routines try to acquire the device lock.
1356 */
1357 usb_remove_sysfs_dev_files(udev);
1358
782da727
AS		 1359 /* Unregister the device. The device driver is responsible
1360 * for removing the device files from usbfs and sysfs and for
1361 * de-configuring the device.
1362 */
1363 device_del(&udev->dev);
3099e75a 1364
782da727 1365 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1366 * (or root_hub) pointer.
1367 */
1da177e4 1368 release_address(udev);
1da177e4
LT		 1369
1370 /* Avoid races with recursively_mark_NOTATTACHED() */
1371 spin_lock_irq(&device_state_lock);
1372 *pdev = NULL;
1373 spin_unlock_irq(&device_state_lock);
1374
d5d4db70 1375 usb_stop_pm(udev);
ee49fb5d 1376
782da727 1377 put_device(&udev->dev);
1da177e4
LT		 1378}
1379
f2a383e4 1380#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1da177e4
LT		 1381static void show_string(struct usb_device *udev, char *id, char *string)
1382{
1383 if (!string)
1384 return;
1385 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1386}
1387
f2a383e4
GKH		 1388static void announce_device(struct usb_device *udev)
1389{
1390 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1391 le16_to_cpu(udev->descriptor.idVendor),
1392 le16_to_cpu(udev->descriptor.idProduct));
1393 dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, "
1394 "SerialNumber=%d\n",
1395 udev->descriptor.iManufacturer,
1396 udev->descriptor.iProduct,
1397 udev->descriptor.iSerialNumber);
1398 show_string(udev, "Product", udev->product);
1399 show_string(udev, "Manufacturer", udev->manufacturer);
1400 show_string(udev, "SerialNumber", udev->serial);
1401}
1da177e4 1402#else
f2a383e4 1403static inline void announce_device(struct usb_device *udev) { }
1da177e4
LT		 1404#endif
1405
1da177e4
LT		 1406#ifdef CONFIG_USB_OTG
1407#include "otg_whitelist.h"
1408#endif
1409
3ede760f 1410/**
d9d16e8a 1411 * usb_configure_device_otg - FIXME (usbcore-internal)
3ede760f
ON		 1412 * @udev: newly addressed device (in ADDRESS state)
1413 *
d9d16e8a 1414 * Do configuration for On-The-Go devices
3ede760f 1415 */
d9d16e8a 1416static int usb_configure_device_otg(struct usb_device *udev)
1da177e4 1417{
d9d16e8a 1418 int err = 0;
1da177e4
LT		 1419
1420#ifdef CONFIG_USB_OTG
1421 /*
1422 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1423 * to wake us after we've powered off VBUS; and HNP, switching roles
1424 * "host" to "peripheral". The OTG descriptor helps figure this out.
1425 */
1426 if (!udev->bus->is_b_host
1427 && udev->config
1428 && udev->parent == udev->bus->root_hub) {
1429 struct usb_otg_descriptor *desc = 0;
1430 struct usb_bus *bus = udev->bus;
1431
1432 /* descriptor may appear anywhere in config */
1433 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1434 le16_to_cpu(udev->config[0].desc.wTotalLength),
1435 USB_DT_OTG, (void **) &desc) == 0) {
1436 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1437 unsigned port1 = udev->portnum;
fc849b85 1438
1da177e4
LT		 1439 dev_info(&udev->dev,
1440 "Dual-Role OTG device on %sHNP port\n",
1441 (port1 == bus->otg_port)
1442 ? "" : "non-");
1443
1444 /* enable HNP before suspend, it's simpler */
1445 if (port1 == bus->otg_port)
1446 bus->b_hnp_enable = 1;
1447 err = usb_control_msg(udev,
1448 usb_sndctrlpipe(udev, 0),
1449 USB_REQ_SET_FEATURE, 0,
1450 bus->b_hnp_enable
1451 ? USB_DEVICE_B_HNP_ENABLE
1452 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1453 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1454 if (err < 0) {
1455 /* OTG MESSAGE: report errors here,
1456 * customize to match your product.
1457 */
1458 dev_info(&udev->dev,
1459 "can't set HNP mode; %d\n",
1460 err);
1461 bus->b_hnp_enable = 0;
1462 }
1463 }
1464 }
1465 }
1466
1467 if (!is_targeted(udev)) {
1468
1469 /* Maybe it can talk to us, though we can't talk to it.
1470 * (Includes HNP test device.)
1471 */
1472 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
4956eccd 1473 err = usb_port_suspend(udev);
1da177e4
LT		 1474 if (err < 0)
1475 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1476 }
ffcdc18d 1477 err = -ENOTSUPP;
1da177e4
LT		 1478 goto fail;
1479 }
d9d16e8a 1480fail:
1da177e4 1481#endif
d9d16e8a
IPG		 1482 return err;
1483}
1484
1485
1486/**
1487 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1488 * @udev: newly addressed device (in ADDRESS state)
1489 *
1490 * This is only called by usb_new_device() and usb_authorize_device()
1491 * and FIXME -- all comments that apply to them apply here wrt to
1492 * environment.
1493 *
1494 * If the device is WUSB and not authorized, we don't attempt to read
1495 * the string descriptors, as they will be errored out by the device
1496 * until it has been authorized.
1497 */
1498static int usb_configure_device(struct usb_device *udev)
1499{
1500 int err;
1da177e4 1501
d9d16e8a
IPG		 1502 if (udev->config == NULL) {
1503 err = usb_get_configuration(udev);
1504 if (err < 0) {
1505 dev_err(&udev->dev, "can't read configurations, error %d\n",
1506 err);
1507 goto fail;
1508 }
1509 }
1510 if (udev->wusb == 1 && udev->authorized == 0) {
1511 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1512 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1513 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1514 }
1515 else {
1516 /* read the standard strings and cache them if present */
1517 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1518 udev->manufacturer = usb_cache_string(udev,
1519 udev->descriptor.iManufacturer);
1520 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1521 }
1522 err = usb_configure_device_otg(udev);
1523fail:
1524 return err;
1525}
1526
1527
1528/**
1529 * usb_new_device - perform initial device setup (usbcore-internal)
1530 * @udev: newly addressed device (in ADDRESS state)
1531 *
1532 * This is called with devices which have been enumerated, but not yet
1533 * configured. The device descriptor is available, but not descriptors
1534 * for any device configuration. The caller must have locked either
1535 * the parent hub (if udev is a normal device) or else the
1536 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1537 * udev has already been installed, but udev is not yet visible through
1538 * sysfs or other filesystem code.
1539 *
1540 * It will return if the device is configured properly or not. Zero if
1541 * the interface was registered with the driver core; else a negative
1542 * errno value.
1543 *
1544 * This call is synchronous, and may not be used in an interrupt context.
1545 *
1546 * Only the hub driver or root-hub registrar should ever call this.
1547 */
1548int usb_new_device(struct usb_device *udev)
1549{
1550 int err;
1551
1552 usb_detect_quirks(udev); /* Determine quirks */
1553 err = usb_configure_device(udev); /* detect & probe dev/intfs */
1554 if (err < 0)
1555 goto fail;
9f8b17e6
KS		 1556 /* export the usbdev device-node for libusb */
1557 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1558 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1559
195af2cc
AS		 1560 /* Increment the parent's count of unsuspended children */
1561 if (udev->parent)
1562 usb_autoresume_device(udev->parent);
1563
782da727 1564 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1565 * for adding the device files to sysfs and for configuring
1566 * the device.
782da727 1567 */
9f8b17e6 1568 err = device_add(&udev->dev);
1da177e4
LT		 1569 if (err) {
1570 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1571 goto fail;
1572 }
9ad3d6cc 1573
e16362a0
AS		 1574 /* put device-specific files into sysfs */
1575 usb_create_sysfs_dev_files(udev);
1576
d9d16e8a 1577 /* Tell the world! */
f2a383e4 1578 announce_device(udev);
c066475e 1579 return err;
1da177e4
LT		 1580
1581fail:
1582 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
d9d16e8a 1583 return err;
1da177e4
LT		 1584}
1585
93993a0a
IPG		 1586
1587/**
fd39c86b
RD		 1588 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1589 * @usb_dev: USB device
1590 *
1591 * Move the USB device to a very basic state where interfaces are disabled
1592 * and the device is in fact unconfigured and unusable.
93993a0a
IPG		 1593 *
1594 * We share a lock (that we have) with device_del(), so we need to
1595 * defer its call.
1596 */
1597int usb_deauthorize_device(struct usb_device *usb_dev)
1598{
1599 unsigned cnt;
1600 usb_lock_device(usb_dev);
1601 if (usb_dev->authorized == 0)
1602 goto out_unauthorized;
1603 usb_dev->authorized = 0;
1604 usb_set_configuration(usb_dev, -1);
1605 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1606 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1607 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1608 kfree(usb_dev->config);
1609 usb_dev->config = NULL;
1610 for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
1611 kfree(usb_dev->rawdescriptors[cnt]);
1612 usb_dev->descriptor.bNumConfigurations = 0;
1613 kfree(usb_dev->rawdescriptors);
1614out_unauthorized:
1615 usb_unlock_device(usb_dev);
1616 return 0;
1617}
1618
1619
1620int usb_authorize_device(struct usb_device *usb_dev)
1621{
1622 int result = 0, c;
1623 usb_lock_device(usb_dev);
1624 if (usb_dev->authorized == 1)
1625 goto out_authorized;
1626 kfree(usb_dev->product);
1627 usb_dev->product = NULL;
1628 kfree(usb_dev->manufacturer);
1629 usb_dev->manufacturer = NULL;
1630 kfree(usb_dev->serial);
1631 usb_dev->serial = NULL;
1632 result = usb_autoresume_device(usb_dev);
1633 if (result < 0) {
1634 dev_err(&usb_dev->dev,
1635 "can't autoresume for authorization: %d\n", result);
1636 goto error_autoresume;
1637 }
1638 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1639 if (result < 0) {
1640 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1641 "authorization: %d\n", result);
1642 goto error_device_descriptor;
1643 }
1644 usb_dev->authorized = 1;
1645 result = usb_configure_device(usb_dev);
1646 if (result < 0)
1647 goto error_configure;
1648 /* Choose and set the configuration. This registers the interfaces
1649 * with the driver core and lets interface drivers bind to them.
1650 */
b5ea060f 1651 c = usb_choose_configuration(usb_dev);
93993a0a
IPG		 1652 if (c >= 0) {
1653 result = usb_set_configuration(usb_dev, c);
1654 if (result) {
1655 dev_err(&usb_dev->dev,
1656 "can't set config #%d, error %d\n", c, result);
1657 /* This need not be fatal. The user can try to
1658 * set other configurations. */
1659 }
1660 }
1661 dev_info(&usb_dev->dev, "authorized to connect\n");
1662error_configure:
1663error_device_descriptor:
1664error_autoresume:
1665out_authorized:
1666 usb_unlock_device(usb_dev); // complements locktree
1667 return result;
1668}
1669
1670
0165de09
IPG		 1671/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1672static unsigned hub_is_wusb(struct usb_hub *hub)
1673{
1674 struct usb_hcd *hcd;
1675 if (hub->hdev->parent != NULL) /* not a root hub? */
1676 return 0;
1677 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1678 return hcd->wireless;
1679}
1680
1681
1da177e4
LT		 1682#define PORT_RESET_TRIES 5
1683#define SET_ADDRESS_TRIES 2
1684#define GET_DESCRIPTOR_TRIES 2
1685#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1686#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1687
1688#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1689#define HUB_SHORT_RESET_TIME 10
1690#define HUB_LONG_RESET_TIME 200
1691#define HUB_RESET_TIMEOUT 500
1692
1693static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1694 struct usb_device *udev, unsigned int delay)
1695{
1696 int delay_time, ret;
1697 u16 portstatus;
1698 u16 portchange;
1699
1700 for (delay_time = 0;
1701 delay_time < HUB_RESET_TIMEOUT;
1702 delay_time += delay) {
1703 /* wait to give the device a chance to reset */
1704 msleep(delay);
1705
1706 /* read and decode port status */
1707 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1708 if (ret < 0)
1709 return ret;
1710
1711 /* Device went away? */
1712 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1713 return -ENOTCONN;
1714
dd4dd19e 1715 /* bomb out completely if the connection bounced */
1da177e4 1716 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1717 return -ENOTCONN;
1da177e4
LT		 1718
1719 /* if we`ve finished resetting, then break out of the loop */
1720 if (!(portstatus & USB_PORT_STAT_RESET) &&
1721 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1722 if (hub_is_wusb(hub))
1723 udev->speed = USB_SPEED_VARIABLE;
1724 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1725 udev->speed = USB_SPEED_HIGH;
1726 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1727 udev->speed = USB_SPEED_LOW;
1728 else
1729 udev->speed = USB_SPEED_FULL;
1730 return 0;
1731 }
1732
1733 /* switch to the long delay after two short delay failures */
1734 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1735 delay = HUB_LONG_RESET_TIME;
1736
1737 dev_dbg (hub->intfdev,
1738 "port %d not reset yet, waiting %dms\n",
1739 port1, delay);
1740 }
1741
1742 return -EBUSY;
1743}
1744
1745static int hub_port_reset(struct usb_hub *hub, int port1,
1746 struct usb_device *udev, unsigned int delay)
1747{
1748 int i, status;
1749
32fe0198
AS		 1750 /* Block EHCI CF initialization during the port reset.
1751 * Some companion controllers don't like it when they mix.
1752 */
1753 down_read(&ehci_cf_port_reset_rwsem);
1754
1da177e4
LT		 1755 /* Reset the port */
1756 for (i = 0; i < PORT_RESET_TRIES; i++) {
1757 status = set_port_feature(hub->hdev,
1758 port1, USB_PORT_FEAT_RESET);
1759 if (status)
1760 dev_err(hub->intfdev,
1761 "cannot reset port %d (err = %d)\n",
1762 port1, status);
1763 else {
1764 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1765 if (status && status != -ENOTCONN)
1da177e4
LT		 1766 dev_dbg(hub->intfdev,
1767 "port_wait_reset: err = %d\n",
1768 status);
1769 }
1770
1771 /* return on disconnect or reset */
1772 switch (status) {
1773 case 0:
b789696a
DB		 1774 /* TRSTRCY = 10 ms; plus some extra */
1775 msleep(10 + 40);
4953d141 1776 update_address(udev, 0);
1da177e4
LT		 1777 /* FALL THROUGH */
1778 case -ENOTCONN:
1779 case -ENODEV:
1780 clear_port_feature(hub->hdev,
1781 port1, USB_PORT_FEAT_C_RESET);
1782 /* FIXME need disconnect() for NOTATTACHED device */
1783 usb_set_device_state(udev, status
1784 ? USB_STATE_NOTATTACHED
1785 : USB_STATE_DEFAULT);
32fe0198 1786 goto done;
1da177e4
LT		 1787 }
1788
1789 dev_dbg (hub->intfdev,
1790 "port %d not enabled, trying reset again...\n",
1791 port1);
1792 delay = HUB_LONG_RESET_TIME;
1793 }
1794
1795 dev_err (hub->intfdev,
1796 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1797 port1);
1798
32fe0198
AS		 1799 done:
1800 up_read(&ehci_cf_port_reset_rwsem);
1da177e4
LT		 1801 return status;
1802}
1803
d388dab7 1804#ifdef CONFIG_PM
1da177e4 1805
b01b03f3
AS		 1806#define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
1807 USB_PORT_STAT_SUSPEND)
1808#define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
1809
1810/* Determine whether the device on a port is ready for a normal resume,
1811 * is ready for a reset-resume, or should be disconnected.
1812 */
1813static int check_port_resume_type(struct usb_device *udev,
1814 struct usb_hub *hub, int port1,
1815 int status, unsigned portchange, unsigned portstatus)
1816{
1817 /* Is the device still present? */
1818 if (status || (portstatus & MASK_BITS) != WANT_BITS) {
1819 if (status >= 0)
1820 status = -ENODEV;
1821 }
1822
1823 /* Can't do a normal resume if the port isn't enabled */
1824 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume)
1825 status = -ENODEV;
1826
1827 if (status) {
1828 dev_dbg(hub->intfdev,
1829 "port %d status %04x.%04x after resume, %d\n",
1830 port1, portchange, portstatus, status);
1831 } else if (udev->reset_resume) {
1832
1833 /* Late port handoff can set status-change bits */
1834 if (portchange & USB_PORT_STAT_C_CONNECTION)
1835 clear_port_feature(hub->hdev, port1,
1836 USB_PORT_FEAT_C_CONNECTION);
1837 if (portchange & USB_PORT_STAT_C_ENABLE)
1838 clear_port_feature(hub->hdev, port1,
1839 USB_PORT_FEAT_C_ENABLE);
1840 }
1841
1842 return status;
1843}
1844
1da177e4
LT		 1845#ifdef CONFIG_USB_SUSPEND
1846
1847/*
624d6c07
AS		 1848 * usb_port_suspend - suspend a usb device's upstream port
1849 * @udev: device that's no longer in active use, not a root hub
1850 * Context: must be able to sleep; device not locked; pm locks held
1851 *
1852 * Suspends a USB device that isn't in active use, conserving power.
1853 * Devices may wake out of a suspend, if anything important happens,
1854 * using the remote wakeup mechanism. They may also be taken out of
1855 * suspend by the host, using usb_port_resume(). It's also routine
1856 * to disconnect devices while they are suspended.
1857 *
1858 * This only affects the USB hardware for a device; its interfaces
1859 * (and, for hubs, child devices) must already have been suspended.
1860 *
1da177e4
LT		 1861 * Selective port suspend reduces power; most suspended devices draw
1862 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1863 * All devices below the suspended port are also suspended.
1864 *
1865 * Devices leave suspend state when the host wakes them up. Some devices
1866 * also support "remote wakeup", where the device can activate the USB
1867 * tree above them to deliver data, such as a keypress or packet. In
1868 * some cases, this wakes the USB host.
624d6c07
AS		 1869 *
1870 * Suspending OTG devices may trigger HNP, if that's been enabled
1871 * between a pair of dual-role devices. That will change roles, such
1872 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1873 *
1874 * Devices on USB hub ports have only one "suspend" state, corresponding
1875 * to ACPI D2, "may cause the device to lose some context".
1876 * State transitions include:
1877 *
1878 * - suspend, resume ... when the VBUS power link stays live
1879 * - suspend, disconnect ... VBUS lost
1880 *
1881 * Once VBUS drop breaks the circuit, the port it's using has to go through
1882 * normal re-enumeration procedures, starting with enabling VBUS power.
1883 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1884 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1885 * timer, no SRP, no requests through sysfs.
1886 *
1887 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1888 * the root hub for their bus goes into global suspend ... so we don't
1889 * (falsely) update the device power state to say it suspended.
1890 *
1891 * Returns 0 on success, else negative errno.
1da177e4 1892 */
624d6c07 1893int usb_port_suspend(struct usb_device *udev)
1da177e4 1894{
624d6c07
AS		 1895 struct usb_hub *hub = hdev_to_hub(udev->parent);
1896 int port1 = udev->portnum;
1897 int status;
1da177e4
LT		 1898
1899 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1900
1901 /* enable remote wakeup when appropriate; this lets the device
1902 * wake up the upstream hub (including maybe the root hub).
1903 *
1904 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1905 * we don't explicitly enable it here.
1906 */
645daaab 1907 if (udev->do_remote_wakeup) {
1da177e4
LT		 1908 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1909 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1910 USB_DEVICE_REMOTE_WAKEUP, 0,
1911 NULL, 0,
1912 USB_CTRL_SET_TIMEOUT);
1913 if (status)
624d6c07
AS		 1914 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1915 status);
1da177e4
LT		 1916 }
1917
1918 /* see 7.1.7.6 */
1919 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1920 if (status) {
624d6c07
AS		 1921 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1922 port1, status);
1da177e4
LT		 1923 /* paranoia: "should not happen" */
1924 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1925 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1926 USB_DEVICE_REMOTE_WAKEUP, 0,
1927 NULL, 0,
1928 USB_CTRL_SET_TIMEOUT);
1929 } else {
1930 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1931 dev_dbg(&udev->dev, "usb %ssuspend\n",
1932 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1933 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1934 msleep(10);
1935 }
1936 return status;
1937}
1938
1da177e4 1939/*
390a8c34
DB		 1940 * If the USB "suspend" state is in use (rather than "global suspend"),
1941 * many devices will be individually taken out of suspend state using
54515fe5 1942 * special "resume" signaling. This routine kicks in shortly after
1da177e4
LT		 1943 * hardware resume signaling is finished, either because of selective
1944 * resume (by host) or remote wakeup (by device) ... now see what changed
1945 * in the tree that's rooted at this device.
54515fe5
AS		 1946 *
1947 * If @udev->reset_resume is set then the device is reset before the
1948 * status check is done.
1da177e4 1949 */
140d8f68 1950static int finish_port_resume(struct usb_device *udev)
1da177e4 1951{
54515fe5 1952 int status = 0;
1da177e4
LT		 1953 u16 devstatus;
1954
1955 /* caller owns the udev device lock */
54515fe5
AS		 1956 dev_dbg(&udev->dev, "finish %sresume\n",
1957 udev->reset_resume ? "reset-" : "");
1da177e4
LT		 1958
1959 /* usb ch9 identifies four variants of SUSPENDED, based on what
1960 * state the device resumes to. Linux currently won't see the
1961 * first two on the host side; they'd be inside hub_port_init()
1962 * during many timeouts, but khubd can't suspend until later.
1963 */
1964 usb_set_device_state(udev, udev->actconfig
1965 ? USB_STATE_CONFIGURED
1966 : USB_STATE_ADDRESS);
1da177e4 1967
54515fe5
AS		 1968 /* 10.5.4.5 says not to reset a suspended port if the attached
1969 * device is enabled for remote wakeup. Hence the reset
1970 * operation is carried out here, after the port has been
1971 * resumed.
1972 */
1973 if (udev->reset_resume)
1974 status = usb_reset_device(udev);
1975
1da177e4
LT		 1976 /* 10.5.4.5 says be sure devices in the tree are still there.
1977 * For now let's assume the device didn't go crazy on resume,
1978 * and device drivers will know about any resume quirks.
1979 */
54515fe5 1980 if (status == 0) {
46dede46 1981 devstatus = 0;
54515fe5
AS		 1982 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1983 if (status >= 0)
46dede46 1984 status = (status > 0 ? 0 : -ENODEV);
54515fe5 1985 }
b40b7a90 1986
624d6c07
AS		 1987 if (status) {
1988 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
1989 status);
1990 } else if (udev->actconfig) {
1da177e4 1991 le16_to_cpus(&devstatus);
686314cf 1992 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1da177e4
LT		 1993 status = usb_control_msg(udev,
1994 usb_sndctrlpipe(udev, 0),
1995 USB_REQ_CLEAR_FEATURE,
1996 USB_RECIP_DEVICE,
1997 USB_DEVICE_REMOTE_WAKEUP, 0,
1998 NULL, 0,
1999 USB_CTRL_SET_TIMEOUT);
a8e7c565 2000 if (status)
1da177e4
LT		 2001 dev_dbg(&udev->dev, "disable remote "
2002 "wakeup, status %d\n", status);
4bf0ba86 2003 }
1da177e4 2004 status = 0;
1da177e4
LT		 2005 }
2006 return status;
2007}
2008
624d6c07
AS		 2009/*
2010 * usb_port_resume - re-activate a suspended usb device's upstream port
2011 * @udev: device to re-activate, not a root hub
2012 * Context: must be able to sleep; device not locked; pm locks held
2013 *
2014 * This will re-activate the suspended device, increasing power usage
2015 * while letting drivers communicate again with its endpoints.
2016 * USB resume explicitly guarantees that the power session between
2017 * the host and the device is the same as it was when the device
2018 * suspended.
2019 *
feccc30d
AS		 2020 * If @udev->reset_resume is set then this routine won't check that the
2021 * port is still enabled. Furthermore, finish_port_resume() above will
54515fe5
AS		 2022 * reset @udev. The end result is that a broken power session can be
2023 * recovered and @udev will appear to persist across a loss of VBUS power.
2024 *
2025 * For example, if a host controller doesn't maintain VBUS suspend current
2026 * during a system sleep or is reset when the system wakes up, all the USB
2027 * power sessions below it will be broken. This is especially troublesome
2028 * for mass-storage devices containing mounted filesystems, since the
2029 * device will appear to have disconnected and all the memory mappings
2030 * to it will be lost. Using the USB_PERSIST facility, the device can be
2031 * made to appear as if it had not disconnected.
2032 *
feccc30d
AS		 2033 * This facility can be dangerous. Although usb_reset_device() makes
2034 * every effort to insure that the same device is present after the
54515fe5
AS		 2035 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2036 * quite possible for a device to remain unaltered but its media to be
2037 * changed. If the user replaces a flash memory card while the system is
2038 * asleep, he will have only himself to blame when the filesystem on the
2039 * new card is corrupted and the system crashes.
2040 *
624d6c07
AS		 2041 * Returns 0 on success, else negative errno.
2042 */
2043int usb_port_resume(struct usb_device *udev)
1da177e4 2044{
624d6c07
AS		 2045 struct usb_hub *hub = hdev_to_hub(udev->parent);
2046 int port1 = udev->portnum;
2047 int status;
2048 u16 portchange, portstatus;
d25450c6
AS		 2049
2050 /* Skip the initial Clear-Suspend step for a remote wakeup */
2051 status = hub_port_status(hub, port1, &portstatus, &portchange);
2052 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
2053 goto SuspendCleared;
1da177e4
LT		 2054
2055 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2056
d5cbad4b
AS		 2057 set_bit(port1, hub->busy_bits);
2058
1da177e4
LT		 2059 /* see 7.1.7.7; affects power usage, but not budgeting */
2060 status = clear_port_feature(hub->hdev,
2061 port1, USB_PORT_FEAT_SUSPEND);
2062 if (status) {
624d6c07
AS		 2063 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2064 port1, status);
1da177e4 2065 } else {
1da177e4 2066 /* drive resume for at least 20 msec */
686314cf
AS		 2067 dev_dbg(&udev->dev, "usb %sresume\n",
2068 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 2069 msleep(25);
2070
1da177e4
LT		 2071 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2072 * stop resume signaling. Then finish the resume
2073 * sequence.
2074 */
d25450c6 2075 status = hub_port_status(hub, port1, &portstatus, &portchange);
54515fe5 2076
b01b03f3
AS		 2077 /* TRSMRCY = 10 msec */
2078 msleep(10);
2079 }
2080
54515fe5 2081 SuspendCleared:
b01b03f3
AS		 2082 if (status == 0) {
2083 if (portchange & USB_PORT_STAT_C_SUSPEND)
2084 clear_port_feature(hub->hdev, port1,
2085 USB_PORT_FEAT_C_SUSPEND);
1da177e4 2086 }
1da177e4 2087
d5cbad4b 2088 clear_bit(port1, hub->busy_bits);
09ca8adb
LT		 2089 if (!hub->hdev->parent && !hub->busy_bits[0])
2090 usb_enable_root_hub_irq(hub->hdev->bus);
d5cbad4b 2091
b01b03f3
AS		 2092 status = check_port_resume_type(udev,
2093 hub, port1, status, portchange, portstatus);
54515fe5
AS		 2094 if (status == 0)
2095 status = finish_port_resume(udev);
2096 if (status < 0) {
2097 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2098 hub_port_logical_disconnect(hub, port1);
2099 }
1da177e4
LT		 2100 return status;
2101}
2102
8808f00c 2103/* caller has locked udev */
1da177e4
LT		 2104static int remote_wakeup(struct usb_device *udev)
2105{
2106 int status = 0;
2107
1da177e4 2108 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 2109 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 2110 usb_mark_last_busy(udev);
6b157c9b 2111 status = usb_external_resume_device(udev);
1da177e4 2112 }
1da177e4
LT		 2113 return status;
2114}
2115
d388dab7
AS		 2116#else /* CONFIG_USB_SUSPEND */
2117
2118/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2119
2120int usb_port_suspend(struct usb_device *udev)
2121{
2122 return 0;
2123}
2124
b01b03f3
AS		 2125/* However we may need to do a reset-resume */
2126
d388dab7
AS		 2127int usb_port_resume(struct usb_device *udev)
2128{
b01b03f3
AS		 2129 struct usb_hub *hub = hdev_to_hub(udev->parent);
2130 int port1 = udev->portnum;
2131 int status;
2132 u16 portchange, portstatus;
2133
2134 status = hub_port_status(hub, port1, &portstatus, &portchange);
2135 status = check_port_resume_type(udev,
2136 hub, port1, status, portchange, portstatus);
54515fe5 2137
b01b03f3
AS		 2138 if (status) {
2139 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2140 hub_port_logical_disconnect(hub, port1);
2141 } else if (udev->reset_resume) {
54515fe5
AS		 2142 dev_dbg(&udev->dev, "reset-resume\n");
2143 status = usb_reset_device(udev);
2144 }
2145 return status;
d388dab7
AS		 2146}
2147
2148static inline int remote_wakeup(struct usb_device *udev)
2149{
2150 return 0;
2151}
2152
2153#endif
2154
db690874 2155static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 2156{
2157 struct usb_hub *hub = usb_get_intfdata (intf);
2158 struct usb_device *hdev = hub->hdev;
2159 unsigned port1;
1da177e4 2160
c9f89fa4 2161 /* fail if children aren't already suspended */
1da177e4
LT		 2162 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2163 struct usb_device *udev;
2164
2165 udev = hdev->children [port1-1];
6840d255 2166 if (udev && udev->can_submit) {
645daaab
AS		 2167 if (!hdev->auto_pm)
2168 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2169 port1);
c9f89fa4
DB		 2170 return -EBUSY;
2171 }
1da177e4
LT		 2172 }
2173
441b62c1 2174 dev_dbg(&intf->dev, "%s\n", __func__);
40f122f3 2175
12f1ff83 2176 /* stop khubd and related activity */
4330354f 2177 hub_quiesce(hub, HUB_SUSPEND);
b6f6436d 2178 return 0;
1da177e4
LT		 2179}
2180
2181static int hub_resume(struct usb_interface *intf)
2182{
5e6effae 2183 struct usb_hub *hub = usb_get_intfdata(intf);
40f122f3 2184
5e6effae 2185 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2186 hub_activate(hub, HUB_RESUME);
1da177e4
LT		 2187 return 0;
2188}
2189
b41a60ec 2190static int hub_reset_resume(struct usb_interface *intf)
f07600cf 2191{
b41a60ec 2192 struct usb_hub *hub = usb_get_intfdata(intf);
f07600cf 2193
5e6effae 2194 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2195 hub_activate(hub, HUB_RESET_RESUME);
f07600cf
AS		 2196 return 0;
2197}
2198
54515fe5
AS		 2199/**
2200 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2201 * @rhdev: struct usb_device for the root hub
2202 *
2203 * The USB host controller driver calls this function when its root hub
2204 * is resumed and Vbus power has been interrupted or the controller
feccc30d
AS		 2205 * has been reset. The routine marks @rhdev as having lost power.
2206 * When the hub driver is resumed it will take notice and carry out
2207 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2208 * the others will be disconnected.
54515fe5
AS		 2209 */
2210void usb_root_hub_lost_power(struct usb_device *rhdev)
2211{
2212 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2213 rhdev->reset_resume = 1;
2214}
2215EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2216
d388dab7
AS		 2217#else /* CONFIG_PM */
2218
2219static inline int remote_wakeup(struct usb_device *udev)
2220{
2221 return 0;
2222}
2223
f07600cf
AS		 2224#define hub_suspend NULL
2225#define hub_resume NULL
2226#define hub_reset_resume NULL
d388dab7
AS		 2227#endif
2228
1da177e4
LT		 2229
2230/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2231 *
2232 * Between connect detection and reset signaling there must be a delay
2233 * of 100ms at least for debounce and power-settling. The corresponding
2234 * timer shall restart whenever the downstream port detects a disconnect.
2235 *
2236 * Apparently there are some bluetooth and irda-dongles and a number of
2237 * low-speed devices for which this debounce period may last over a second.
2238 * Not covered by the spec - but easy to deal with.
2239 *
2240 * This implementation uses a 1500ms total debounce timeout; if the
2241 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2242 * every 25ms for transient disconnects. When the port status has been
2243 * unchanged for 100ms it returns the port status.
2244 */
1da177e4
LT		 2245static int hub_port_debounce(struct usb_hub *hub, int port1)
2246{
2247 int ret;
2248 int total_time, stable_time = 0;
2249 u16 portchange, portstatus;
2250 unsigned connection = 0xffff;
2251
2252 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2253 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2254 if (ret < 0)
2255 return ret;
2256
2257 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2258 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2259 stable_time += HUB_DEBOUNCE_STEP;
2260 if (stable_time >= HUB_DEBOUNCE_STABLE)
2261 break;
2262 } else {
2263 stable_time = 0;
2264 connection = portstatus & USB_PORT_STAT_CONNECTION;
2265 }
2266
2267 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2268 clear_port_feature(hub->hdev, port1,
2269 USB_PORT_FEAT_C_CONNECTION);
2270 }
2271
2272 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2273 break;
2274 msleep(HUB_DEBOUNCE_STEP);
2275 }
2276
2277 dev_dbg (hub->intfdev,
2278 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2279 port1, total_time, stable_time, portstatus);
2280
2281 if (stable_time < HUB_DEBOUNCE_STABLE)
2282 return -ETIMEDOUT;
2283 return portstatus;
2284}
2285
fc721f51 2286void usb_ep0_reinit(struct usb_device *udev)
1da177e4
LT		 2287{
2288 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2289 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
bdd016ba 2290 usb_enable_endpoint(udev, &udev->ep0);
1da177e4 2291}
fc721f51 2292EXPORT_SYMBOL_GPL(usb_ep0_reinit);
1da177e4
LT		 2293
2294#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2295#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2296
4326ed0b 2297static int hub_set_address(struct usb_device *udev, int devnum)
1da177e4
LT		 2298{
2299 int retval;
2300
4326ed0b 2301 if (devnum <= 1)
1da177e4
LT		 2302 return -EINVAL;
2303 if (udev->state == USB_STATE_ADDRESS)
2304 return 0;
2305 if (udev->state != USB_STATE_DEFAULT)
2306 return -EINVAL;
2307 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4326ed0b 2308 USB_REQ_SET_ADDRESS, 0, devnum, 0,
1da177e4
LT		 2309 NULL, 0, USB_CTRL_SET_TIMEOUT);
2310 if (retval == 0) {
4953d141
DV		 2311 /* Device now using proper address. */
2312 update_address(udev, devnum);
1da177e4 2313 usb_set_device_state(udev, USB_STATE_ADDRESS);
fc721f51 2314 usb_ep0_reinit(udev);
1da177e4
LT		 2315 }
2316 return retval;
2317}
2318
2319/* Reset device, (re)assign address, get device descriptor.
2320 * Device connection must be stable, no more debouncing needed.
2321 * Returns device in USB_STATE_ADDRESS, except on error.
2322 *
2323 * If this is called for an already-existing device (as part of
2324 * usb_reset_device), the caller must own the device lock. For a
2325 * newly detected device that is not accessible through any global
2326 * pointers, it's not necessary to lock the device.
2327 */
2328static int
2329hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2330 int retry_counter)
2331{
4186ecf8 2332 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2333
2334 struct usb_device *hdev = hub->hdev;
2335 int i, j, retval;
2336 unsigned delay = HUB_SHORT_RESET_TIME;
2337 enum usb_device_speed oldspeed = udev->speed;
83a07196 2338 char *speed, *type;
4326ed0b 2339 int devnum = udev->devnum;
1da177e4
LT		 2340
2341 /* root hub ports have a slightly longer reset period
2342 * (from USB 2.0 spec, section 7.1.7.5)
2343 */
2344 if (!hdev->parent) {
2345 delay = HUB_ROOT_RESET_TIME;
2346 if (port1 == hdev->bus->otg_port)
2347 hdev->bus->b_hnp_enable = 0;
2348 }
2349
2350 /* Some low speed devices have problems with the quick delay, so */
2351 /* be a bit pessimistic with those devices. RHbug #23670 */
2352 if (oldspeed == USB_SPEED_LOW)
2353 delay = HUB_LONG_RESET_TIME;
2354
4186ecf8 2355 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2356
2357 /* Reset the device; full speed may morph to high speed */
2358 retval = hub_port_reset(hub, port1, udev, delay);
2359 if (retval < 0) /* error or disconnect */
2360 goto fail;
2361 /* success, speed is known */
2362 retval = -ENODEV;
2363
2364 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2365 dev_dbg(&udev->dev, "device reset changed speed!\n");
2366 goto fail;
2367 }
2368 oldspeed = udev->speed;
4326ed0b 2369
1da177e4
LT		 2370 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2371 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2372 * For Wireless USB devices, ep0 max packet is always 512 (tho
2373 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2374 */
2375 switch (udev->speed) {
5bb6e0ae
IPG		 2376 case USB_SPEED_VARIABLE: /* fixed at 512 */
2377 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2378 break;
1da177e4
LT		 2379 case USB_SPEED_HIGH: /* fixed at 64 */
2380 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2381 break;
2382 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2383 /* to determine the ep0 maxpacket size, try to read
2384 * the device descriptor to get bMaxPacketSize0 and
2385 * then correct our initial guess.
2386 */
2387 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2388 break;
2389 case USB_SPEED_LOW: /* fixed at 8 */
2390 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2391 break;
2392 default:
2393 goto fail;
2394 }
2395
83a07196
IPG		 2396 type = "";
2397 switch (udev->speed) {
2398 case USB_SPEED_LOW: speed = "low"; break;
2399 case USB_SPEED_FULL: speed = "full"; break;
2400 case USB_SPEED_HIGH: speed = "high"; break;
2401 case USB_SPEED_VARIABLE:
2402 speed = "variable";
2403 type = "Wireless ";
2404 break;
2405 default: speed = "?"; break;
2406 }
1da177e4 2407 dev_info (&udev->dev,
83a07196
IPG		 2408 "%s %s speed %sUSB device using %s and address %d\n",
2409 (udev->config) ? "reset" : "new", speed, type,
4326ed0b 2410 udev->bus->controller->driver->name, devnum);
1da177e4
LT		 2411
2412 /* Set up TT records, if needed */
2413 if (hdev->tt) {
2414 udev->tt = hdev->tt;
2415 udev->ttport = hdev->ttport;
2416 } else if (udev->speed != USB_SPEED_HIGH
2417 && hdev->speed == USB_SPEED_HIGH) {
2418 udev->tt = &hub->tt;
2419 udev->ttport = port1;
2420 }
2421
2422 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2423 * Because device hardware and firmware is sometimes buggy in
2424 * this area, and this is how Linux has done it for ages.
2425 * Change it cautiously.
2426 *
2427 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2428 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2429 * so it may help with some non-standards-compliant devices.
2430 * Otherwise we start with SET_ADDRESS and then try to read the
2431 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2432 * value.
2433 */
2434 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2435 if (USE_NEW_SCHEME(retry_counter)) {
2436 struct usb_device_descriptor *buf;
2437 int r = 0;
2438
2439#define GET_DESCRIPTOR_BUFSIZE 64
2440 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2441 if (!buf) {
2442 retval = -ENOMEM;
2443 continue;
2444 }
2445
b89ee19a
AS		 2446 /* Retry on all errors; some devices are flakey.
2447 * 255 is for WUSB devices, we actually need to use
2448 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2449 */
2450 for (j = 0; j < 3; ++j) {
2451 buf->bMaxPacketSize0 = 0;
2452 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2453 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2454 USB_DT_DEVICE << 8, 0,
2455 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2456 USB_CTRL_GET_TIMEOUT);
1da177e4 2457 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2458 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2459 if (buf->bDescriptorType ==
2460 USB_DT_DEVICE) {
2461 r = 0;
2462 break;
2463 }
2464 /* FALL THROUGH */
2465 default:
2466 if (r == 0)
2467 r = -EPROTO;
2468 break;
2469 }
2470 if (r == 0)
2471 break;
2472 }
2473 udev->descriptor.bMaxPacketSize0 =
2474 buf->bMaxPacketSize0;
2475 kfree(buf);
2476
2477 retval = hub_port_reset(hub, port1, udev, delay);
2478 if (retval < 0) /* error or disconnect */
2479 goto fail;
2480 if (oldspeed != udev->speed) {
2481 dev_dbg(&udev->dev,
2482 "device reset changed speed!\n");
2483 retval = -ENODEV;
2484 goto fail;
2485 }
2486 if (r) {
2487 dev_err(&udev->dev, "device descriptor "
2488 "read/%s, error %d\n",
2489 "64", r);
2490 retval = -EMSGSIZE;
2491 continue;
2492 }
2493#undef GET_DESCRIPTOR_BUFSIZE
2494 }
2495
6c529cdc
IPG		 2496 /*
2497 * If device is WUSB, we already assigned an
2498 * unauthorized address in the Connect Ack sequence;
2499 * authorization will assign the final address.
2500 */
2501 if (udev->wusb == 0) {
2502 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2503 retval = hub_set_address(udev, devnum);
2504 if (retval >= 0)
2505 break;
2506 msleep(200);
2507 }
2508 if (retval < 0) {
2509 dev_err(&udev->dev,
2510 "device not accepting address %d, error %d\n",
2511 devnum, retval);
2512 goto fail;
2513 }
2514
2515 /* cope with hardware quirkiness:
2516 * - let SET_ADDRESS settle, some device hardware wants it
2517 * - read ep0 maxpacket even for high and low speed,
2518 */
2519 msleep(10);
2520 if (USE_NEW_SCHEME(retry_counter))
1da177e4 2521 break;
6c529cdc 2522 }
1da177e4
LT		 2523
2524 retval = usb_get_device_descriptor(udev, 8);
2525 if (retval < 8) {
2526 dev_err(&udev->dev, "device descriptor "
2527 "read/%s, error %d\n",
2528 "8", retval);
2529 if (retval >= 0)
2530 retval = -EMSGSIZE;
2531 } else {
2532 retval = 0;
2533 break;
2534 }
2535 }
2536 if (retval)
2537 goto fail;
2538
6c529cdc 2539 i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */
5bb6e0ae 2540 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2541 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2542 if (udev->speed != USB_SPEED_FULL ||
2543 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2544 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2545 retval = -EMSGSIZE;
2546 goto fail;
2547 }
2548 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2549 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
fc721f51 2550 usb_ep0_reinit(udev);
1da177e4
LT		 2551 }
2552
2553 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2554 if (retval < (signed)sizeof(udev->descriptor)) {
2555 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2556 "all", retval);
2557 if (retval >= 0)
2558 retval = -ENOMSG;
2559 goto fail;
2560 }
2561
2562 retval = 0;
2563
2564fail:
4326ed0b 2565 if (retval) {
1da177e4 2566 hub_port_disable(hub, port1, 0);
4953d141 2567 update_address(udev, devnum); /* for disconnect processing */
4326ed0b 2568 }
4186ecf8 2569 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2570 return retval;
2571}
2572
2573static void
2574check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2575{
2576 struct usb_qualifier_descriptor *qual;
2577 int status;
2578
e94b1766 2579 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2580 if (qual == NULL)
2581 return;
2582
2583 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2584 qual, sizeof *qual);
2585 if (status == sizeof *qual) {
2586 dev_info(&udev->dev, "not running at top speed; "
2587 "connect to a high speed hub\n");
2588 /* hub LEDs are probably harder to miss than syslog */
2589 if (hub->has_indicators) {
2590 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2591 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2592 }
2593 }
1bc3c9e1 2594 kfree(qual);
1da177e4
LT		 2595}
2596
2597static unsigned
2598hub_power_remaining (struct usb_hub *hub)
2599{
2600 struct usb_device *hdev = hub->hdev;
2601 int remaining;
55c52718 2602 int port1;
1da177e4 2603
55c52718 2604 if (!hub->limited_power)
1da177e4
LT		 2605 return 0;
2606
55c52718
AS		 2607 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2608 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2609 struct usb_device *udev = hdev->children[port1 - 1];
2610 int delta;
1da177e4
LT		 2611
2612 if (!udev)
2613 continue;
2614
55c52718
AS		 2615 /* Unconfigured devices may not use more than 100mA,
2616 * or 8mA for OTG ports */
1da177e4 2617 if (udev->actconfig)
55c52718
AS		 2618 delta = udev->actconfig->desc.bMaxPower * 2;
2619 else if (port1 != udev->bus->otg_port || hdev->parent)
2620 delta = 100;
1da177e4 2621 else
55c52718
AS		 2622 delta = 8;
2623 if (delta > hub->mA_per_port)
2624 dev_warn(&udev->dev, "%dmA is over %umA budget "
2625 "for port %d!\n",
2626 delta, hub->mA_per_port, port1);
1da177e4
LT		 2627 remaining -= delta;
2628 }
2629 if (remaining < 0) {
55c52718
AS		 2630 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2631 - remaining);
1da177e4
LT		 2632 remaining = 0;
2633 }
2634 return remaining;
2635}
2636
2637/* Handle physical or logical connection change events.
2638 * This routine is called when:
2639 * a port connection-change occurs;
2640 * a port enable-change occurs (often caused by EMI);
2641 * usb_reset_device() encounters changed descriptors (as from
2642 * a firmware download)
2643 * caller already locked the hub
2644 */
2645static void hub_port_connect_change(struct usb_hub *hub, int port1,
2646 u16 portstatus, u16 portchange)
2647{
2648 struct usb_device *hdev = hub->hdev;
2649 struct device *hub_dev = hub->intfdev;
90da096e 2650 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
24618b0c
AS		 2651 unsigned wHubCharacteristics =
2652 le16_to_cpu(hub->descriptor->wHubCharacteristics);
8808f00c 2653 struct usb_device *udev;
1da177e4 2654 int status, i;
24618b0c 2655
1da177e4
LT		 2656 dev_dbg (hub_dev,
2657 "port %d, status %04x, change %04x, %s\n",
2658 port1, portstatus, portchange, portspeed (portstatus));
2659
2660 if (hub->has_indicators) {
2661 set_port_led(hub, port1, HUB_LED_AUTO);
2662 hub->indicator[port1-1] = INDICATOR_AUTO;
2663 }
1da177e4
LT		 2664
2665#ifdef CONFIG_USB_OTG
2666 /* during HNP, don't repeat the debounce */
2667 if (hdev->bus->is_b_host)
24618b0c
AS		 2668 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
2669 USB_PORT_STAT_C_ENABLE);
1da177e4
LT		 2670#endif
2671
24618b0c
AS		 2672 /* Try to use the debounce delay for protection against
2673 * port-enable changes caused, for example, by EMI.
2674 */
2675 if (portchange & (USB_PORT_STAT_C_CONNECTION |
2676 USB_PORT_STAT_C_ENABLE)) {
1da177e4 2677 status = hub_port_debounce(hub, port1);
d4b7d8e8
AS		 2678 if (status < 0) {
2679 if (printk_ratelimit())
2680 dev_err (hub_dev, "connect-debounce failed, "
2681 "port %d disabled\n", port1);
24618b0c
AS		 2682 portstatus &= ~USB_PORT_STAT_CONNECTION;
2683 } else {
2684 portstatus = status;
1da177e4 2685 }
1da177e4
LT		 2686 }
2687
8808f00c
AS		 2688 /* Try to resuscitate an existing device */
2689 udev = hdev->children[port1-1];
2690 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
2691 udev->state != USB_STATE_NOTATTACHED) {
2692
2693 usb_lock_device(udev);
2694 if (portstatus & USB_PORT_STAT_ENABLE) {
2695 status = 0; /* Nothing to do */
2696 } else if (!udev->persist_enabled) {
2697 status = -ENODEV; /* Mustn't resuscitate */
2698
2699#ifdef CONFIG_USB_SUSPEND
2700 } else if (udev->state == USB_STATE_SUSPENDED) {
2701 /* For a suspended device, treat this as a
2702 * remote wakeup event.
2703 */
2704 if (udev->do_remote_wakeup)
2705 status = remote_wakeup(udev);
2706
2707 /* Otherwise leave it be; devices can't tell the
2708 * difference between suspended and disabled.
2709 */
2710 else
2711 status = 0;
2712#endif
2713
2714 } else {
625f6949 2715 status = usb_reset_composite_device(udev);
8808f00c
AS		 2716 }
2717 usb_unlock_device(udev);
2718
2719 if (status == 0) {
2720 clear_bit(port1, hub->change_bits);
2721 return;
2722 }
2723 }
2724
24618b0c 2725 /* Disconnect any existing devices under this port */
8808f00c 2726 if (udev)
24618b0c
AS		 2727 usb_disconnect(&hdev->children[port1-1]);
2728 clear_bit(port1, hub->change_bits);
2729
2730 /* Return now if debouncing failed or nothing is connected */
1da177e4
LT		 2731 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2732
2733 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2734 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2735 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2736 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2737
2738 if (portstatus & USB_PORT_STAT_ENABLE)
2739 goto done;
2740 return;
2741 }
2742
1da177e4 2743 for (i = 0; i < SET_CONFIG_TRIES; i++) {
1da177e4
LT		 2744
2745 /* reallocate for each attempt, since references
2746 * to the previous one can escape in various ways
2747 */
2748 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2749 if (!udev) {
2750 dev_err (hub_dev,
2751 "couldn't allocate port %d usb_device\n",
2752 port1);
2753 goto done;
2754 }
2755
2756 usb_set_device_state(udev, USB_STATE_POWERED);
2757 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2758 udev->bus_mA = hub->mA_per_port;
b6956ffa 2759 udev->level = hdev->level + 1;
8af548dc 2760 udev->wusb = hub_is_wusb(hub);
55c52718 2761
1da177e4
LT		 2762 /* set the address */
2763 choose_address(udev);
2764 if (udev->devnum <= 0) {
2765 status = -ENOTCONN; /* Don't retry */
2766 goto loop;
2767 }
2768
2769 /* reset and get descriptor */
2770 status = hub_port_init(hub, udev, port1, i);
2771 if (status < 0)
2772 goto loop;
2773
2774 /* consecutive bus-powered hubs aren't reliable; they can
2775 * violate the voltage drop budget. if the new child has
2776 * a "powered" LED, users should notice we didn't enable it
2777 * (without reading syslog), even without per-port LEDs
2778 * on the parent.
2779 */
2780 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2781 && udev->bus_mA <= 100) {
1da177e4
LT		 2782 u16 devstat;
2783
2784 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2785 &devstat);
55c52718 2786 if (status < 2) {
1da177e4
LT		 2787 dev_dbg(&udev->dev, "get status %d ?\n", status);
2788 goto loop_disable;
2789 }
55c52718 2790 le16_to_cpus(&devstat);
1da177e4
LT		 2791 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2792 dev_err(&udev->dev,
2793 "can't connect bus-powered hub "
2794 "to this port\n");
2795 if (hub->has_indicators) {
2796 hub->indicator[port1-1] =
2797 INDICATOR_AMBER_BLINK;
c4028958 2798 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2799 }
2800 status = -ENOTCONN; /* Don't retry */
2801 goto loop_disable;
2802 }
2803 }
2804
2805 /* check for devices running slower than they could */
2806 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2807 && udev->speed == USB_SPEED_FULL
2808 && highspeed_hubs != 0)
2809 check_highspeed (hub, udev, port1);
2810
2811 /* Store the parent's children[] pointer. At this point
2812 * udev becomes globally accessible, although presumably
2813 * no one will look at it until hdev is unlocked.
2814 */
1da177e4
LT		 2815 status = 0;
2816
2817 /* We mustn't add new devices if the parent hub has
2818 * been disconnected; we would race with the
2819 * recursively_mark_NOTATTACHED() routine.
2820 */
2821 spin_lock_irq(&device_state_lock);
2822 if (hdev->state == USB_STATE_NOTATTACHED)
2823 status = -ENOTCONN;
2824 else
2825 hdev->children[port1-1] = udev;
2826 spin_unlock_irq(&device_state_lock);
2827
2828 /* Run it through the hoops (find a driver, etc) */
2829 if (!status) {
2830 status = usb_new_device(udev);
2831 if (status) {
2832 spin_lock_irq(&device_state_lock);
2833 hdev->children[port1-1] = NULL;
2834 spin_unlock_irq(&device_state_lock);
2835 }
2836 }
2837
1da177e4
LT		 2838 if (status)
2839 goto loop_disable;
2840
2841 status = hub_power_remaining(hub);
2842 if (status)
55c52718 2843 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2844
2845 return;
2846
2847loop_disable:
2848 hub_port_disable(hub, port1, 1);
2849loop:
fc721f51 2850 usb_ep0_reinit(udev);
1da177e4
LT		 2851 release_address(udev);
2852 usb_put_dev(udev);
ffcdc18d 2853 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT		 2854 break;
2855 }
3a31155c
AS		 2856 if (hub->hdev->parent ||
2857 !hcd->driver->port_handed_over ||
2858 !(hcd->driver->port_handed_over)(hcd, port1))
2859 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
2860 port1);
1da177e4
LT		 2861
2862done:
2863 hub_port_disable(hub, port1, 1);
90da096e
BR		 2864 if (hcd->driver->relinquish_port && !hub->hdev->parent)
2865 hcd->driver->relinquish_port(hcd, port1);
1da177e4
LT		 2866}
2867
2868static void hub_events(void)
2869{
2870 struct list_head *tmp;
2871 struct usb_device *hdev;
2872 struct usb_interface *intf;
2873 struct usb_hub *hub;
2874 struct device *hub_dev;
2875 u16 hubstatus;
2876 u16 hubchange;
2877 u16 portstatus;
2878 u16 portchange;
2879 int i, ret;
2880 int connect_change;
2881
2882 /*
2883 * We restart the list every time to avoid a deadlock with
2884 * deleting hubs downstream from this one. This should be
2885 * safe since we delete the hub from the event list.
2886 * Not the most efficient, but avoids deadlocks.
2887 */
2888 while (1) {
2889
2890 /* Grab the first entry at the beginning of the list */
2891 spin_lock_irq(&hub_event_lock);
2892 if (list_empty(&hub_event_list)) {
2893 spin_unlock_irq(&hub_event_lock);
2894 break;
2895 }
2896
2897 tmp = hub_event_list.next;
2898 list_del_init(tmp);
2899
2900 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS		 2901 kref_get(&hub->kref);
2902 spin_unlock_irq(&hub_event_lock);
1da177e4 2903
e8054854
AS		 2904 hdev = hub->hdev;
2905 hub_dev = hub->intfdev;
2906 intf = to_usb_interface(hub_dev);
40f122f3 2907 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2908 hdev->state, hub->descriptor
2909 ? hub->descriptor->bNbrPorts
2910 : 0,
2911 /* NOTE: expects max 15 ports... */
2912 (u16) hub->change_bits[0],
40f122f3 2913 (u16) hub->event_bits[0]);
1da177e4 2914
1da177e4
LT		 2915 /* Lock the device, then check to see if we were
2916 * disconnected while waiting for the lock to succeed. */
06b84e8a 2917 usb_lock_device(hdev);
e8054854 2918 if (unlikely(hub->disconnected))
1da177e4
LT		 2919 goto loop;
2920
2921 /* If the hub has died, clean up after it */
2922 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b 2923 hub->error = -ENODEV;
4330354f 2924 hub_quiesce(hub, HUB_DISCONNECT);
1da177e4
LT		 2925 goto loop;
2926 }
2927
40f122f3
AS		 2928 /* Autoresume */
2929 ret = usb_autopm_get_interface(intf);
2930 if (ret) {
2931 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2932 goto loop;
2933 }
a8e7c565 2934
40f122f3 2935 /* If this is an inactive hub, do nothing */
1da177e4 2936 if (hub->quiescing)
40f122f3 2937 goto loop_autopm;
1da177e4
LT		 2938
2939 if (hub->error) {
2940 dev_dbg (hub_dev, "resetting for error %d\n",
2941 hub->error);
2942
625f6949 2943 ret = usb_reset_composite_device(hdev);
1da177e4
LT		 2944 if (ret) {
2945 dev_dbg (hub_dev,
2946 "error resetting hub: %d\n", ret);
40f122f3 2947 goto loop_autopm;
1da177e4
LT		 2948 }
2949
2950 hub->nerrors = 0;
2951 hub->error = 0;
2952 }
2953
2954 /* deal with port status changes */
2955 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2956 if (test_bit(i, hub->busy_bits))
2957 continue;
2958 connect_change = test_bit(i, hub->change_bits);
2959 if (!test_and_clear_bit(i, hub->event_bits) &&
6ee0b270 2960 !connect_change)
1da177e4
LT		 2961 continue;
2962
2963 ret = hub_port_status(hub, i,
2964 &portstatus, &portchange);
2965 if (ret < 0)
2966 continue;
2967
1da177e4
LT		 2968 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2969 clear_port_feature(hdev, i,
2970 USB_PORT_FEAT_C_CONNECTION);
2971 connect_change = 1;
2972 }
2973
2974 if (portchange & USB_PORT_STAT_C_ENABLE) {
2975 if (!connect_change)
2976 dev_dbg (hub_dev,
2977 "port %d enable change, "
2978 "status %08x\n",
2979 i, portstatus);
2980 clear_port_feature(hdev, i,
2981 USB_PORT_FEAT_C_ENABLE);
2982
2983 /*
2984 * EM interference sometimes causes badly
2985 * shielded USB devices to be shutdown by
2986 * the hub, this hack enables them again.
2987 * Works at least with mouse driver.
2988 */
2989 if (!(portstatus & USB_PORT_STAT_ENABLE)
2990 && !connect_change
2991 && hdev->children[i-1]) {
2992 dev_err (hub_dev,
2993 "port %i "
2994 "disabled by hub (EMI?), "
2995 "re-enabling...\n",
2996 i);
2997 connect_change = 1;
2998 }
2999 }
3000
3001 if (portchange & USB_PORT_STAT_C_SUSPEND) {
8808f00c
AS		 3002 struct usb_device *udev;
3003
1da177e4
LT		 3004 clear_port_feature(hdev, i,
3005 USB_PORT_FEAT_C_SUSPEND);
8808f00c
AS		 3006 udev = hdev->children[i-1];
3007 if (udev) {
3008 usb_lock_device(udev);
1da177e4
LT		 3009 ret = remote_wakeup(hdev->
3010 children[i-1]);
8808f00c 3011 usb_unlock_device(udev);
1da177e4
LT		 3012 if (ret < 0)
3013 connect_change = 1;
3014 } else {
3015 ret = -ENODEV;
3016 hub_port_disable(hub, i, 1);
3017 }
3018 dev_dbg (hub_dev,
3019 "resume on port %d, status %d\n",
3020 i, ret);
3021 }
3022
3023 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3024 dev_err (hub_dev,
3025 "over-current change on port %d\n",
3026 i);
3027 clear_port_feature(hdev, i,
3028 USB_PORT_FEAT_C_OVER_CURRENT);
3029 hub_power_on(hub);
3030 }
3031
3032 if (portchange & USB_PORT_STAT_C_RESET) {
3033 dev_dbg (hub_dev,
3034 "reset change on port %d\n",
3035 i);
3036 clear_port_feature(hdev, i,
3037 USB_PORT_FEAT_C_RESET);
3038 }
3039
3040 if (connect_change)
3041 hub_port_connect_change(hub, i,
3042 portstatus, portchange);
3043 } /* end for i */
3044
3045 /* deal with hub status changes */
3046 if (test_and_clear_bit(0, hub->event_bits) == 0)
3047 ; /* do nothing */
3048 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3049 dev_err (hub_dev, "get_hub_status failed\n");
3050 else {
3051 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3052 dev_dbg (hub_dev, "power change\n");
3053 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 3054 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3055 /* FIXME: Is this always true? */
55c52718 3056 hub->limited_power = 1;
403fae78 3057 else
3058 hub->limited_power = 0;
1da177e4
LT		 3059 }
3060 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3061 dev_dbg (hub_dev, "overcurrent change\n");
3062 msleep(500); /* Cool down */
3063 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3064 hub_power_on(hub);
3065 }
3066 }
3067
09ca8adb
LT		 3068 /* If this is a root hub, tell the HCD it's okay to
3069 * re-enable port-change interrupts now. */
3070 if (!hdev->parent && !hub->busy_bits[0])
3071 usb_enable_root_hub_irq(hdev->bus);
3072
40f122f3
AS		 3073loop_autopm:
3074 /* Allow autosuspend if we're not going to run again */
3075 if (list_empty(&hub->event_list))
3076 usb_autopm_enable(intf);
1da177e4
LT		 3077loop:
3078 usb_unlock_device(hdev);
e8054854 3079 kref_put(&hub->kref, hub_release);
1da177e4
LT		 3080
3081 } /* end while (1) */
3082}
3083
3084static int hub_thread(void *__unused)
3085{
3bb1af52
AS		 3086 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3087 * port handover. Otherwise it might see that a full-speed device
3088 * was gone before the EHCI controller had handed its port over to
3089 * the companion full-speed controller.
3090 */
83144186 3091 set_freezable();
3bb1af52 3092
1da177e4
LT		 3093 do {
3094 hub_events();
e42837bc 3095 wait_event_freezable(khubd_wait,
9c8d6178
AM		 3096 !list_empty(&hub_event_list) ||
3097 kthread_should_stop());
9c8d6178 3098 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 3099
9c8d6178
AM		 3100 pr_debug("%s: khubd exiting\n", usbcore_name);
3101 return 0;
1da177e4
LT		 3102}
3103
3104static struct usb_device_id hub_id_table [] = {
3105 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3106 .bDeviceClass = USB_CLASS_HUB},
3107 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3108 .bInterfaceClass = USB_CLASS_HUB},
3109 { } /* Terminating entry */
3110};
3111
3112MODULE_DEVICE_TABLE (usb, hub_id_table);
3113
3114static struct usb_driver hub_driver = {
1da177e4
LT		 3115 .name = "hub",
3116 .probe = hub_probe,
3117 .disconnect = hub_disconnect,
3118 .suspend = hub_suspend,
3119 .resume = hub_resume,
f07600cf 3120 .reset_resume = hub_reset_resume,
7de18d8b
AS		 3121 .pre_reset = hub_pre_reset,
3122 .post_reset = hub_post_reset,
1da177e4
LT		 3123 .ioctl = hub_ioctl,
3124 .id_table = hub_id_table,
40f122f3 3125 .supports_autosuspend = 1,
1da177e4
LT		 3126};
3127
3128int usb_hub_init(void)
3129{
1da177e4
LT		 3130 if (usb_register(&hub_driver) < 0) {
3131 printk(KERN_ERR "%s: can't register hub driver\n",
3132 usbcore_name);
3133 return -1;
3134 }
3135
9c8d6178
AM		 3136 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3137 if (!IS_ERR(khubd_task))
1da177e4 3138 return 0;
1da177e4
LT		 3139
3140 /* Fall through if kernel_thread failed */
3141 usb_deregister(&hub_driver);
3142 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3143
3144 return -1;
3145}
3146
3147void usb_hub_cleanup(void)
3148{
9c8d6178 3149 kthread_stop(khubd_task);
1da177e4
LT		 3150
3151 /*
3152 * Hub resources are freed for us by usb_deregister. It calls
3153 * usb_driver_purge on every device which in turn calls that
3154 * devices disconnect function if it is using this driver.
3155 * The hub_disconnect function takes care of releasing the
3156 * individual hub resources. -greg
3157 */
3158 usb_deregister(&hub_driver);
3159} /* usb_hub_cleanup() */
3160
eb764c4b
AS		 3161static int descriptors_changed(struct usb_device *udev,
3162 struct usb_device_descriptor *old_device_descriptor)
3163{
3164 int changed = 0;
3165 unsigned index;
3166 unsigned serial_len = 0;
3167 unsigned len;
3168 unsigned old_length;
3169 int length;
3170 char *buf;
3171
3172 if (memcmp(&udev->descriptor, old_device_descriptor,
3173 sizeof(*old_device_descriptor)) != 0)
3174 return 1;
3175
3176 /* Since the idVendor, idProduct, and bcdDevice values in the
3177 * device descriptor haven't changed, we will assume the
3178 * Manufacturer and Product strings haven't changed either.
3179 * But the SerialNumber string could be different (e.g., a
3180 * different flash card of the same brand).
3181 */
3182 if (udev->serial)
3183 serial_len = strlen(udev->serial) + 1;
1da177e4 3184
eb764c4b 3185 len = serial_len;
1da177e4 3186 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b
AS		 3187 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3188 len = max(len, old_length);
1da177e4 3189 }
eb764c4b 3190
0cc1a51f 3191 buf = kmalloc(len, GFP_NOIO);
1da177e4
LT		 3192 if (buf == NULL) {
3193 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3194 /* assume the worst */
3195 return 1;
3196 }
3197 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b 3198 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
1da177e4
LT		 3199 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3200 old_length);
eb764c4b 3201 if (length != old_length) {
1da177e4
LT		 3202 dev_dbg(&udev->dev, "config index %d, error %d\n",
3203 index, length);
eb764c4b 3204 changed = 1;
1da177e4
LT		 3205 break;
3206 }
3207 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3208 != 0) {
3209 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
eb764c4b
AS		 3210 index,
3211 ((struct usb_config_descriptor *) buf)->
3212 bConfigurationValue);
3213 changed = 1;
1da177e4
LT		 3214 break;
3215 }
3216 }
eb764c4b
AS		 3217
3218 if (!changed && serial_len) {
3219 length = usb_string(udev, udev->descriptor.iSerialNumber,
3220 buf, serial_len);
3221 if (length + 1 != serial_len) {
3222 dev_dbg(&udev->dev, "serial string error %d\n",
3223 length);
3224 changed = 1;
3225 } else if (memcmp(buf, udev->serial, length) != 0) {
3226 dev_dbg(&udev->dev, "serial string changed\n");
3227 changed = 1;
3228 }
3229 }
3230
1da177e4 3231 kfree(buf);
eb764c4b 3232 return changed;
1da177e4
LT		 3233}
3234
3235/**
3236 * usb_reset_device - perform a USB port reset to reinitialize a device
3237 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3238 *
79efa097
AS		 3239 * WARNING - don't use this routine to reset a composite device
3240 * (one with multiple interfaces owned by separate drivers)!
3241 * Use usb_reset_composite_device() instead.
1da177e4
LT		 3242 *
3243 * Do a port reset, reassign the device's address, and establish its
3244 * former operating configuration. If the reset fails, or the device's
3245 * descriptors change from their values before the reset, or the original
3246 * configuration and altsettings cannot be restored, a flag will be set
3247 * telling khubd to pretend the device has been disconnected and then
3248 * re-connected. All drivers will be unbound, and the device will be
3249 * re-enumerated and probed all over again.
3250 *
3251 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3252 * flagged for logical disconnection, or some other negative error code
3253 * if the reset wasn't even attempted.
3254 *
3255 * The caller must own the device lock. For example, it's safe to use
3256 * this from a driver probe() routine after downloading new firmware.
3257 * For calls that might not occur during probe(), drivers should lock
3258 * the device using usb_lock_device_for_reset().
6bc6cff5
AS		 3259 *
3260 * Locking exception: This routine may also be called from within an
3261 * autoresume handler. Such usage won't conflict with other tasks
3262 * holding the device lock because these tasks should always call
3263 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4
LT		 3264 */
3265int usb_reset_device(struct usb_device *udev)
3266{
3267 struct usb_device *parent_hdev = udev->parent;
3268 struct usb_hub *parent_hub;
3269 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 3270 int i, ret = 0;
3271 int port1 = udev->portnum;
1da177e4
LT		 3272
3273 if (udev->state == USB_STATE_NOTATTACHED ||
3274 udev->state == USB_STATE_SUSPENDED) {
3275 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3276 udev->state);
3277 return -EINVAL;
3278 }
3279
3280 if (!parent_hdev) {
3281 /* this requires hcd-specific logic; see OHCI hc_restart() */
441b62c1 3282 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
1da177e4
LT		 3283 return -EISDIR;
3284 }
1da177e4
LT		 3285 parent_hub = hdev_to_hub(parent_hdev);
3286
1da177e4
LT		 3287 set_bit(port1, parent_hub->busy_bits);
3288 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3289
3290 /* ep0 maxpacket size may change; let the HCD know about it.
3291 * Other endpoints will be handled by re-enumeration. */
fc721f51 3292 usb_ep0_reinit(udev);
1da177e4 3293 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 3294 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT		 3295 break;
3296 }
3297 clear_bit(port1, parent_hub->busy_bits);
09ca8adb
LT		 3298 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
3299 usb_enable_root_hub_irq(parent_hdev->bus);
d5cbad4b 3300
1da177e4
LT		 3301 if (ret < 0)
3302 goto re_enumerate;
3303
3304 /* Device might have changed firmware (DFU or similar) */
eb764c4b 3305 if (descriptors_changed(udev, &descriptor)) {
1da177e4
LT		 3306 dev_info(&udev->dev, "device firmware changed\n");
3307 udev->descriptor = descriptor; /* for disconnect() calls */
3308 goto re_enumerate;
3309 }
3310
3311 if (!udev->actconfig)
3312 goto done;
3313
3314 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3315 USB_REQ_SET_CONFIGURATION, 0,
3316 udev->actconfig->desc.bConfigurationValue, 0,
3317 NULL, 0, USB_CTRL_SET_TIMEOUT);
3318 if (ret < 0) {
3319 dev_err(&udev->dev,
3320 "can't restore configuration #%d (error=%d)\n",
3321 udev->actconfig->desc.bConfigurationValue, ret);
3322 goto re_enumerate;
3323 }
3324 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3325
3326 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3327 struct usb_interface *intf = udev->actconfig->interface[i];
3328 struct usb_interface_descriptor *desc;
3329
3330 /* set_interface resets host side toggle even
3331 * for altsetting zero. the interface may have no driver.
3332 */
3333 desc = &intf->cur_altsetting->desc;
3334 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3335 desc->bAlternateSetting);
3336 if (ret < 0) {
3337 dev_err(&udev->dev, "failed to restore interface %d "
3338 "altsetting %d (error=%d)\n",
3339 desc->bInterfaceNumber,
3340 desc->bAlternateSetting,
3341 ret);
3342 goto re_enumerate;
3343 }
3344 }
3345
3346done:
1da177e4
LT		 3347 return 0;
3348
3349re_enumerate:
3350 hub_port_logical_disconnect(parent_hub, port1);
3351 return -ENODEV;
3352}
782e70c6 3353EXPORT_SYMBOL_GPL(usb_reset_device);
79efa097
AS		 3354
3355/**
3356 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3357 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
79efa097
AS		 3358 *
3359 * Warns all drivers bound to registered interfaces (using their pre_reset
3360 * method), performs the port reset, and then lets the drivers know that
3361 * the reset is over (using their post_reset method).
3362 *
3363 * Return value is the same as for usb_reset_device().
3364 *
3365 * The caller must own the device lock. For example, it's safe to use
3366 * this from a driver probe() routine after downloading new firmware.
3367 * For calls that might not occur during probe(), drivers should lock
3368 * the device using usb_lock_device_for_reset().
79efa097 3369 */
625f6949 3370int usb_reset_composite_device(struct usb_device *udev)
79efa097
AS		 3371{
3372 int ret;
852c4b43 3373 int i;
79efa097
AS		 3374 struct usb_host_config *config = udev->actconfig;
3375
3376 if (udev->state == USB_STATE_NOTATTACHED ||
3377 udev->state == USB_STATE_SUSPENDED) {
3378 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3379 udev->state);
3380 return -EINVAL;
3381 }
3382
645daaab 3383 /* Prevent autosuspend during the reset */
94fcda1f 3384 usb_autoresume_device(udev);
645daaab 3385
79efa097 3386 if (config) {
79efa097 3387 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
852c4b43
AS		 3388 struct usb_interface *cintf = config->interface[i];
3389 struct usb_driver *drv;
3390
3391 if (cintf->dev.driver) {
79efa097
AS		 3392 drv = to_usb_driver(cintf->dev.driver);
3393 if (drv->pre_reset)
3394 (drv->pre_reset)(cintf);
f07600cf 3395 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
79efa097
AS		 3396 }
3397 }
3398 }
3399
3400 ret = usb_reset_device(udev);
3401
3402 if (config) {
79efa097 3403 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
852c4b43
AS		 3404 struct usb_interface *cintf = config->interface[i];
3405 struct usb_driver *drv;
3406
3407 if (cintf->dev.driver) {
79efa097
AS		 3408 drv = to_usb_driver(cintf->dev.driver);
3409 if (drv->post_reset)
f07600cf
AS		 3410 (drv->post_reset)(cintf);
3411 /* FIXME: Unbind if post_reset returns an error or isn't defined */
79efa097 3412 }
79efa097
AS		 3413 }
3414 }
3415
94fcda1f 3416 usb_autosuspend_device(udev);
79efa097
AS		 3417 return ret;
3418}
782e70c6 3419EXPORT_SYMBOL_GPL(usb_reset_composite_device);
kernel source for telekom puls (alcatel/mediatek)