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1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/smp_lock.h> | |
21 | #include <linux/ioctl.h> | |
22 | #include <linux/usb.h> | |
23 | #include <linux/usbdevice_fs.h> | |
9c8d6178 | 24 | #include <linux/kthread.h> |
4186ecf8 | 25 | #include <linux/mutex.h> |
1da177e4 LT |
26 | |
27 | #include <asm/semaphore.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/byteorder.h> | |
30 | ||
31 | #include "usb.h" | |
32 | #include "hcd.h" | |
33 | #include "hub.h" | |
34 | ||
35 | /* Protect struct usb_device->state and ->children members | |
9ad3d6cc | 36 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
37 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
38 | static DEFINE_SPINLOCK(device_state_lock); | |
39 | ||
40 | /* khubd's worklist and its lock */ | |
41 | static DEFINE_SPINLOCK(hub_event_lock); | |
42 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
43 | ||
44 | /* Wakes up khubd */ | |
45 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
46 | ||
9c8d6178 | 47 | static struct task_struct *khubd_task; |
1da177e4 LT |
48 | |
49 | /* cycle leds on hubs that aren't blinking for attention */ | |
50 | static int blinkenlights = 0; | |
51 | module_param (blinkenlights, bool, S_IRUGO); | |
52 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
53 | ||
54 | /* | |
55 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
56 | * closely resembles the way Windows works. Hopefully it will be compatible | |
57 | * with a wider range of devices than the old scheme. However some previously | |
58 | * working devices may start giving rise to "device not accepting address" | |
59 | * errors; if that happens the user can try the old scheme by adjusting the | |
60 | * following module parameters. | |
61 | * | |
62 | * For maximum flexibility there are two boolean parameters to control the | |
63 | * hub driver's behavior. On the first initialization attempt, if the | |
64 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
65 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
66 | * is set, then the driver will make another attempt, using the other scheme. | |
67 | */ | |
68 | static int old_scheme_first = 0; | |
69 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
70 | MODULE_PARM_DESC(old_scheme_first, | |
71 | "start with the old device initialization scheme"); | |
72 | ||
73 | static int use_both_schemes = 1; | |
74 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
75 | MODULE_PARM_DESC(use_both_schemes, | |
76 | "try the other device initialization scheme if the " | |
77 | "first one fails"); | |
78 | ||
79 | ||
80 | #ifdef DEBUG | |
81 | static inline char *portspeed (int portstatus) | |
82 | { | |
83 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
84 | return "480 Mb/s"; | |
85 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
86 | return "1.5 Mb/s"; | |
87 | else | |
88 | return "12 Mb/s"; | |
89 | } | |
90 | #endif | |
91 | ||
92 | /* Note that hdev or one of its children must be locked! */ | |
93 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) | |
94 | { | |
95 | return usb_get_intfdata(hdev->actconfig->interface[0]); | |
96 | } | |
97 | ||
98 | /* USB 2.0 spec Section 11.24.4.5 */ | |
99 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
100 | { | |
101 | int i, ret; | |
102 | ||
103 | for (i = 0; i < 3; i++) { | |
104 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
105 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
106 | USB_DT_HUB << 8, 0, data, size, | |
107 | USB_CTRL_GET_TIMEOUT); | |
108 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
109 | return ret; | |
110 | } | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | /* | |
115 | * USB 2.0 spec Section 11.24.2.1 | |
116 | */ | |
117 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
118 | { | |
119 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
120 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
121 | } | |
122 | ||
123 | /* | |
124 | * USB 2.0 spec Section 11.24.2.2 | |
125 | */ | |
126 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
127 | { | |
128 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
129 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
130 | NULL, 0, 1000); | |
131 | } | |
132 | ||
133 | /* | |
134 | * USB 2.0 spec Section 11.24.2.13 | |
135 | */ | |
136 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
137 | { | |
138 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
139 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
140 | NULL, 0, 1000); | |
141 | } | |
142 | ||
143 | /* | |
144 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
145 | * for info about using port indicators | |
146 | */ | |
147 | static void set_port_led( | |
148 | struct usb_hub *hub, | |
149 | int port1, | |
150 | int selector | |
151 | ) | |
152 | { | |
153 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
154 | USB_PORT_FEAT_INDICATOR); | |
155 | if (status < 0) | |
156 | dev_dbg (hub->intfdev, | |
157 | "port %d indicator %s status %d\n", | |
158 | port1, | |
159 | ({ char *s; switch (selector) { | |
160 | case HUB_LED_AMBER: s = "amber"; break; | |
161 | case HUB_LED_GREEN: s = "green"; break; | |
162 | case HUB_LED_OFF: s = "off"; break; | |
163 | case HUB_LED_AUTO: s = "auto"; break; | |
164 | default: s = "??"; break; | |
165 | }; s; }), | |
166 | status); | |
167 | } | |
168 | ||
169 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
170 | ||
171 | static void led_work (void *__hub) | |
172 | { | |
173 | struct usb_hub *hub = __hub; | |
174 | struct usb_device *hdev = hub->hdev; | |
175 | unsigned i; | |
176 | unsigned changed = 0; | |
177 | int cursor = -1; | |
178 | ||
179 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
180 | return; | |
181 | ||
182 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
183 | unsigned selector, mode; | |
184 | ||
185 | /* 30%-50% duty cycle */ | |
186 | ||
187 | switch (hub->indicator[i]) { | |
188 | /* cycle marker */ | |
189 | case INDICATOR_CYCLE: | |
190 | cursor = i; | |
191 | selector = HUB_LED_AUTO; | |
192 | mode = INDICATOR_AUTO; | |
193 | break; | |
194 | /* blinking green = sw attention */ | |
195 | case INDICATOR_GREEN_BLINK: | |
196 | selector = HUB_LED_GREEN; | |
197 | mode = INDICATOR_GREEN_BLINK_OFF; | |
198 | break; | |
199 | case INDICATOR_GREEN_BLINK_OFF: | |
200 | selector = HUB_LED_OFF; | |
201 | mode = INDICATOR_GREEN_BLINK; | |
202 | break; | |
203 | /* blinking amber = hw attention */ | |
204 | case INDICATOR_AMBER_BLINK: | |
205 | selector = HUB_LED_AMBER; | |
206 | mode = INDICATOR_AMBER_BLINK_OFF; | |
207 | break; | |
208 | case INDICATOR_AMBER_BLINK_OFF: | |
209 | selector = HUB_LED_OFF; | |
210 | mode = INDICATOR_AMBER_BLINK; | |
211 | break; | |
212 | /* blink green/amber = reserved */ | |
213 | case INDICATOR_ALT_BLINK: | |
214 | selector = HUB_LED_GREEN; | |
215 | mode = INDICATOR_ALT_BLINK_OFF; | |
216 | break; | |
217 | case INDICATOR_ALT_BLINK_OFF: | |
218 | selector = HUB_LED_AMBER; | |
219 | mode = INDICATOR_ALT_BLINK; | |
220 | break; | |
221 | default: | |
222 | continue; | |
223 | } | |
224 | if (selector != HUB_LED_AUTO) | |
225 | changed = 1; | |
226 | set_port_led(hub, i + 1, selector); | |
227 | hub->indicator[i] = mode; | |
228 | } | |
229 | if (!changed && blinkenlights) { | |
230 | cursor++; | |
231 | cursor %= hub->descriptor->bNbrPorts; | |
232 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
233 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
234 | changed++; | |
235 | } | |
236 | if (changed) | |
237 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
238 | } | |
239 | ||
240 | /* use a short timeout for hub/port status fetches */ | |
241 | #define USB_STS_TIMEOUT 1000 | |
242 | #define USB_STS_RETRIES 5 | |
243 | ||
244 | /* | |
245 | * USB 2.0 spec Section 11.24.2.6 | |
246 | */ | |
247 | static int get_hub_status(struct usb_device *hdev, | |
248 | struct usb_hub_status *data) | |
249 | { | |
250 | int i, status = -ETIMEDOUT; | |
251 | ||
252 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
253 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
254 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
255 | data, sizeof(*data), USB_STS_TIMEOUT); | |
256 | } | |
257 | return status; | |
258 | } | |
259 | ||
260 | /* | |
261 | * USB 2.0 spec Section 11.24.2.7 | |
262 | */ | |
263 | static int get_port_status(struct usb_device *hdev, int port1, | |
264 | struct usb_port_status *data) | |
265 | { | |
266 | int i, status = -ETIMEDOUT; | |
267 | ||
268 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
269 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
270 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
271 | data, sizeof(*data), USB_STS_TIMEOUT); | |
272 | } | |
273 | return status; | |
274 | } | |
275 | ||
276 | static void kick_khubd(struct usb_hub *hub) | |
277 | { | |
278 | unsigned long flags; | |
279 | ||
280 | spin_lock_irqsave(&hub_event_lock, flags); | |
281 | if (list_empty(&hub->event_list)) { | |
282 | list_add_tail(&hub->event_list, &hub_event_list); | |
283 | wake_up(&khubd_wait); | |
284 | } | |
285 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
286 | } | |
287 | ||
288 | void usb_kick_khubd(struct usb_device *hdev) | |
289 | { | |
290 | kick_khubd(hdev_to_hub(hdev)); | |
291 | } | |
292 | ||
293 | ||
294 | /* completion function, fires on port status changes and various faults */ | |
295 | static void hub_irq(struct urb *urb, struct pt_regs *regs) | |
296 | { | |
297 | struct usb_hub *hub = (struct usb_hub *)urb->context; | |
298 | int status; | |
299 | int i; | |
300 | unsigned long bits; | |
301 | ||
302 | switch (urb->status) { | |
303 | case -ENOENT: /* synchronous unlink */ | |
304 | case -ECONNRESET: /* async unlink */ | |
305 | case -ESHUTDOWN: /* hardware going away */ | |
306 | return; | |
307 | ||
308 | default: /* presumably an error */ | |
309 | /* Cause a hub reset after 10 consecutive errors */ | |
310 | dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); | |
311 | if ((++hub->nerrors < 10) || hub->error) | |
312 | goto resubmit; | |
313 | hub->error = urb->status; | |
314 | /* FALL THROUGH */ | |
315 | ||
316 | /* let khubd handle things */ | |
317 | case 0: /* we got data: port status changed */ | |
318 | bits = 0; | |
319 | for (i = 0; i < urb->actual_length; ++i) | |
320 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
321 | << (i*8); | |
322 | hub->event_bits[0] = bits; | |
323 | break; | |
324 | } | |
325 | ||
326 | hub->nerrors = 0; | |
327 | ||
328 | /* Something happened, let khubd figure it out */ | |
329 | kick_khubd(hub); | |
330 | ||
331 | resubmit: | |
332 | if (hub->quiescing) | |
333 | return; | |
334 | ||
335 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
336 | && status != -ENODEV && status != -EPERM) | |
337 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
338 | } | |
339 | ||
340 | /* USB 2.0 spec Section 11.24.2.3 */ | |
341 | static inline int | |
342 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
343 | { | |
344 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
345 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
346 | tt, NULL, 0, 1000); | |
347 | } | |
348 | ||
349 | /* | |
350 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
351 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
352 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
353 | * both can talk to the same hub concurrently. | |
354 | */ | |
355 | static void hub_tt_kevent (void *arg) | |
356 | { | |
357 | struct usb_hub *hub = arg; | |
358 | unsigned long flags; | |
359 | ||
360 | spin_lock_irqsave (&hub->tt.lock, flags); | |
361 | while (!list_empty (&hub->tt.clear_list)) { | |
362 | struct list_head *temp; | |
363 | struct usb_tt_clear *clear; | |
364 | struct usb_device *hdev = hub->hdev; | |
365 | int status; | |
366 | ||
367 | temp = hub->tt.clear_list.next; | |
368 | clear = list_entry (temp, struct usb_tt_clear, clear_list); | |
369 | list_del (&clear->clear_list); | |
370 | ||
371 | /* drop lock so HCD can concurrently report other TT errors */ | |
372 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
373 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
374 | spin_lock_irqsave (&hub->tt.lock, flags); | |
375 | ||
376 | if (status) | |
377 | dev_err (&hdev->dev, | |
378 | "clear tt %d (%04x) error %d\n", | |
379 | clear->tt, clear->devinfo, status); | |
1bc3c9e1 | 380 | kfree(clear); |
1da177e4 LT |
381 | } |
382 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
383 | } | |
384 | ||
385 | /** | |
386 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub | |
387 | * @udev: the device whose split transaction failed | |
388 | * @pipe: identifies the endpoint of the failed transaction | |
389 | * | |
390 | * High speed HCDs use this to tell the hub driver that some split control or | |
391 | * bulk transaction failed in a way that requires clearing internal state of | |
392 | * a transaction translator. This is normally detected (and reported) from | |
393 | * interrupt context. | |
394 | * | |
395 | * It may not be possible for that hub to handle additional full (or low) | |
396 | * speed transactions until that state is fully cleared out. | |
397 | */ | |
398 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) | |
399 | { | |
400 | struct usb_tt *tt = udev->tt; | |
401 | unsigned long flags; | |
402 | struct usb_tt_clear *clear; | |
403 | ||
404 | /* we've got to cope with an arbitrary number of pending TT clears, | |
405 | * since each TT has "at least two" buffers that can need it (and | |
406 | * there can be many TTs per hub). even if they're uncommon. | |
407 | */ | |
408 | if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { | |
409 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); | |
410 | /* FIXME recover somehow ... RESET_TT? */ | |
411 | return; | |
412 | } | |
413 | ||
414 | /* info that CLEAR_TT_BUFFER needs */ | |
415 | clear->tt = tt->multi ? udev->ttport : 1; | |
416 | clear->devinfo = usb_pipeendpoint (pipe); | |
417 | clear->devinfo |= udev->devnum << 4; | |
418 | clear->devinfo |= usb_pipecontrol (pipe) | |
419 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
420 | : (USB_ENDPOINT_XFER_BULK << 11); | |
421 | if (usb_pipein (pipe)) | |
422 | clear->devinfo |= 1 << 15; | |
423 | ||
424 | /* tell keventd to clear state for this TT */ | |
425 | spin_lock_irqsave (&tt->lock, flags); | |
426 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
427 | schedule_work (&tt->kevent); | |
428 | spin_unlock_irqrestore (&tt->lock, flags); | |
429 | } | |
430 | ||
431 | static void hub_power_on(struct usb_hub *hub) | |
432 | { | |
433 | int port1; | |
b789696a | 434 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
74ad9bd2 | 435 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 LT |
436 | |
437 | /* if hub supports power switching, enable power on each port */ | |
74ad9bd2 | 438 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) { |
1da177e4 LT |
439 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
440 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
441 | set_port_feature(hub->hdev, port1, | |
442 | USB_PORT_FEAT_POWER); | |
443 | } | |
444 | ||
b789696a DB |
445 | /* Wait at least 100 msec for power to become stable */ |
446 | msleep(max(pgood_delay, (unsigned) 100)); | |
1da177e4 LT |
447 | } |
448 | ||
979d5199 | 449 | static inline void __hub_quiesce(struct usb_hub *hub) |
1da177e4 | 450 | { |
979d5199 | 451 | /* (nonblocking) khubd and related activity won't re-trigger */ |
1da177e4 | 452 | hub->quiescing = 1; |
c9f89fa4 | 453 | hub->activating = 0; |
979d5199 DB |
454 | hub->resume_root_hub = 0; |
455 | } | |
456 | ||
457 | static void hub_quiesce(struct usb_hub *hub) | |
458 | { | |
459 | /* (blocking) stop khubd and related activity */ | |
460 | __hub_quiesce(hub); | |
1da177e4 LT |
461 | usb_kill_urb(hub->urb); |
462 | if (hub->has_indicators) | |
463 | cancel_delayed_work(&hub->leds); | |
464 | if (hub->has_indicators || hub->tt.hub) | |
465 | flush_scheduled_work(); | |
466 | } | |
467 | ||
468 | static void hub_activate(struct usb_hub *hub) | |
469 | { | |
470 | int status; | |
471 | ||
472 | hub->quiescing = 0; | |
473 | hub->activating = 1; | |
979d5199 | 474 | hub->resume_root_hub = 0; |
1da177e4 LT |
475 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
476 | if (status < 0) | |
477 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
478 | if (hub->has_indicators && blinkenlights) | |
479 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
480 | ||
481 | /* scan all ports ASAP */ | |
482 | kick_khubd(hub); | |
483 | } | |
484 | ||
485 | static int hub_hub_status(struct usb_hub *hub, | |
486 | u16 *status, u16 *change) | |
487 | { | |
488 | int ret; | |
489 | ||
490 | ret = get_hub_status(hub->hdev, &hub->status->hub); | |
491 | if (ret < 0) | |
492 | dev_err (hub->intfdev, | |
493 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
494 | else { | |
495 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
496 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
497 | ret = 0; | |
498 | } | |
499 | return ret; | |
500 | } | |
501 | ||
8b28c752 AS |
502 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
503 | { | |
504 | struct usb_device *hdev = hub->hdev; | |
505 | int ret; | |
506 | ||
507 | if (hdev->children[port1-1] && set_state) { | |
508 | usb_set_device_state(hdev->children[port1-1], | |
509 | USB_STATE_NOTATTACHED); | |
510 | } | |
511 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
512 | if (ret) | |
513 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
514 | port1, ret); | |
515 | ||
516 | return ret; | |
517 | } | |
518 | ||
7d069b7d AS |
519 | |
520 | /* caller has locked the hub device */ | |
521 | static void hub_pre_reset(struct usb_hub *hub, int disable_ports) | |
522 | { | |
523 | struct usb_device *hdev = hub->hdev; | |
524 | int port1; | |
525 | ||
526 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
527 | if (hdev->children[port1 - 1]) { | |
528 | usb_disconnect(&hdev->children[port1 - 1]); | |
529 | if (disable_ports) | |
530 | hub_port_disable(hub, port1, 0); | |
531 | } | |
532 | } | |
533 | hub_quiesce(hub); | |
534 | } | |
535 | ||
536 | /* caller has locked the hub device */ | |
537 | static void hub_post_reset(struct usb_hub *hub) | |
538 | { | |
539 | hub_activate(hub); | |
540 | hub_power_on(hub); | |
541 | } | |
542 | ||
543 | ||
1da177e4 LT |
544 | static int hub_configure(struct usb_hub *hub, |
545 | struct usb_endpoint_descriptor *endpoint) | |
546 | { | |
547 | struct usb_device *hdev = hub->hdev; | |
548 | struct device *hub_dev = hub->intfdev; | |
549 | u16 hubstatus, hubchange; | |
74ad9bd2 | 550 | u16 wHubCharacteristics; |
1da177e4 LT |
551 | unsigned int pipe; |
552 | int maxp, ret; | |
553 | char *message; | |
554 | ||
555 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
556 | &hub->buffer_dma); | |
557 | if (!hub->buffer) { | |
558 | message = "can't allocate hub irq buffer"; | |
559 | ret = -ENOMEM; | |
560 | goto fail; | |
561 | } | |
562 | ||
563 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
564 | if (!hub->status) { | |
565 | message = "can't kmalloc hub status buffer"; | |
566 | ret = -ENOMEM; | |
567 | goto fail; | |
568 | } | |
569 | ||
570 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
571 | if (!hub->descriptor) { | |
572 | message = "can't kmalloc hub descriptor"; | |
573 | ret = -ENOMEM; | |
574 | goto fail; | |
575 | } | |
576 | ||
577 | /* Request the entire hub descriptor. | |
578 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
579 | * but the hub can/will return fewer bytes here. | |
580 | */ | |
581 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
582 | sizeof(*hub->descriptor)); | |
583 | if (ret < 0) { | |
584 | message = "can't read hub descriptor"; | |
585 | goto fail; | |
586 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
587 | message = "hub has too many ports!"; | |
588 | ret = -ENODEV; | |
589 | goto fail; | |
590 | } | |
591 | ||
592 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
593 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
594 | (hdev->maxchild == 1) ? "" : "s"); | |
595 | ||
74ad9bd2 | 596 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 597 | |
74ad9bd2 | 598 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
599 | int i; |
600 | char portstr [USB_MAXCHILDREN + 1]; | |
601 | ||
602 | for (i = 0; i < hdev->maxchild; i++) | |
603 | portstr[i] = hub->descriptor->DeviceRemovable | |
604 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
605 | ? 'F' : 'R'; | |
606 | portstr[hdev->maxchild] = 0; | |
607 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
608 | } else | |
609 | dev_dbg(hub_dev, "standalone hub\n"); | |
610 | ||
74ad9bd2 | 611 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
612 | case 0x00: |
613 | dev_dbg(hub_dev, "ganged power switching\n"); | |
614 | break; | |
615 | case 0x01: | |
616 | dev_dbg(hub_dev, "individual port power switching\n"); | |
617 | break; | |
618 | case 0x02: | |
619 | case 0x03: | |
620 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
621 | break; | |
622 | } | |
623 | ||
74ad9bd2 | 624 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
625 | case 0x00: |
626 | dev_dbg(hub_dev, "global over-current protection\n"); | |
627 | break; | |
628 | case 0x08: | |
629 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
630 | break; | |
631 | case 0x10: | |
632 | case 0x18: | |
633 | dev_dbg(hub_dev, "no over-current protection\n"); | |
634 | break; | |
635 | } | |
636 | ||
637 | spin_lock_init (&hub->tt.lock); | |
638 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
639 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub); | |
640 | switch (hdev->descriptor.bDeviceProtocol) { | |
641 | case 0: | |
642 | break; | |
643 | case 1: | |
644 | dev_dbg(hub_dev, "Single TT\n"); | |
645 | hub->tt.hub = hdev; | |
646 | break; | |
647 | case 2: | |
648 | ret = usb_set_interface(hdev, 0, 1); | |
649 | if (ret == 0) { | |
650 | dev_dbg(hub_dev, "TT per port\n"); | |
651 | hub->tt.multi = 1; | |
652 | } else | |
653 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
654 | ret); | |
655 | hub->tt.hub = hdev; | |
656 | break; | |
657 | default: | |
658 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
659 | hdev->descriptor.bDeviceProtocol); | |
660 | break; | |
661 | } | |
662 | ||
e09711ae | 663 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 664 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
665 | case HUB_TTTT_8_BITS: |
666 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
667 | hub->tt.think_time = 666; | |
668 | dev_dbg(hub_dev, "TT requires at most %d " | |
669 | "FS bit times (%d ns)\n", | |
670 | 8, hub->tt.think_time); | |
671 | } | |
1da177e4 | 672 | break; |
e09711ae DB |
673 | case HUB_TTTT_16_BITS: |
674 | hub->tt.think_time = 666 * 2; | |
675 | dev_dbg(hub_dev, "TT requires at most %d " | |
676 | "FS bit times (%d ns)\n", | |
677 | 16, hub->tt.think_time); | |
1da177e4 | 678 | break; |
e09711ae DB |
679 | case HUB_TTTT_24_BITS: |
680 | hub->tt.think_time = 666 * 3; | |
681 | dev_dbg(hub_dev, "TT requires at most %d " | |
682 | "FS bit times (%d ns)\n", | |
683 | 24, hub->tt.think_time); | |
1da177e4 | 684 | break; |
e09711ae DB |
685 | case HUB_TTTT_32_BITS: |
686 | hub->tt.think_time = 666 * 4; | |
687 | dev_dbg(hub_dev, "TT requires at most %d " | |
688 | "FS bit times (%d ns)\n", | |
689 | 32, hub->tt.think_time); | |
1da177e4 LT |
690 | break; |
691 | } | |
692 | ||
693 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 694 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
695 | hub->has_indicators = 1; |
696 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
697 | } | |
698 | ||
699 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
700 | hub->descriptor->bPwrOn2PwrGood * 2); | |
701 | ||
702 | /* power budgeting mostly matters with bus-powered hubs, | |
703 | * and battery-powered root hubs (may provide just 8 mA). | |
704 | */ | |
705 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 706 | if (ret < 2) { |
1da177e4 LT |
707 | message = "can't get hub status"; |
708 | goto fail; | |
709 | } | |
7d35b929 AS |
710 | le16_to_cpus(&hubstatus); |
711 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
712 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
713 | hub->mA_per_port = 500; | |
714 | else { | |
715 | hub->mA_per_port = hdev->bus_mA; | |
716 | hub->limited_power = 1; | |
717 | } | |
7d35b929 | 718 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
719 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
720 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
721 | hub->limited_power = 1; |
722 | if (hdev->maxchild > 0) { | |
723 | int remaining = hdev->bus_mA - | |
724 | hub->descriptor->bHubContrCurrent; | |
725 | ||
726 | if (remaining < hdev->maxchild * 100) | |
727 | dev_warn(hub_dev, | |
728 | "insufficient power available " | |
729 | "to use all downstream ports\n"); | |
730 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
731 | } | |
732 | } else { /* Self-powered external hub */ | |
733 | /* FIXME: What about battery-powered external hubs that | |
734 | * provide less current per port? */ | |
735 | hub->mA_per_port = 500; | |
7d35b929 | 736 | } |
55c52718 AS |
737 | if (hub->mA_per_port < 500) |
738 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
739 | hub->mA_per_port); | |
1da177e4 LT |
740 | |
741 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
742 | if (ret < 0) { | |
743 | message = "can't get hub status"; | |
744 | goto fail; | |
745 | } | |
746 | ||
747 | /* local power status reports aren't always correct */ | |
748 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
749 | dev_dbg(hub_dev, "local power source is %s\n", | |
750 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
751 | ? "lost (inactive)" : "good"); | |
752 | ||
74ad9bd2 | 753 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
754 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
755 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
756 | ||
757 | /* set up the interrupt endpoint */ | |
758 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); | |
759 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
760 | ||
761 | if (maxp > sizeof(*hub->buffer)) | |
762 | maxp = sizeof(*hub->buffer); | |
763 | ||
764 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
765 | if (!hub->urb) { | |
766 | message = "couldn't allocate interrupt urb"; | |
767 | ret = -ENOMEM; | |
768 | goto fail; | |
769 | } | |
770 | ||
771 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
772 | hub, endpoint->bInterval); | |
773 | hub->urb->transfer_dma = hub->buffer_dma; | |
774 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
775 | ||
776 | /* maybe cycle the hub leds */ | |
777 | if (hub->has_indicators && blinkenlights) | |
778 | hub->indicator [0] = INDICATOR_CYCLE; | |
779 | ||
780 | hub_power_on(hub); | |
781 | hub_activate(hub); | |
782 | return 0; | |
783 | ||
784 | fail: | |
785 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
786 | message, ret); | |
787 | /* hub_disconnect() frees urb and descriptor */ | |
788 | return ret; | |
789 | } | |
790 | ||
791 | static unsigned highspeed_hubs; | |
792 | ||
793 | static void hub_disconnect(struct usb_interface *intf) | |
794 | { | |
795 | struct usb_hub *hub = usb_get_intfdata (intf); | |
796 | struct usb_device *hdev; | |
797 | ||
8b28c752 | 798 | usb_set_intfdata (intf, NULL); |
1da177e4 LT |
799 | hdev = hub->hdev; |
800 | ||
801 | if (hdev->speed == USB_SPEED_HIGH) | |
802 | highspeed_hubs--; | |
803 | ||
7d069b7d AS |
804 | /* Disconnect all children and quiesce the hub */ |
805 | hub_pre_reset(hub, 1); | |
806 | ||
1da177e4 LT |
807 | usb_free_urb(hub->urb); |
808 | hub->urb = NULL; | |
809 | ||
810 | spin_lock_irq(&hub_event_lock); | |
811 | list_del_init(&hub->event_list); | |
812 | spin_unlock_irq(&hub_event_lock); | |
813 | ||
1bc3c9e1 JJ |
814 | kfree(hub->descriptor); |
815 | hub->descriptor = NULL; | |
1da177e4 | 816 | |
1bc3c9e1 JJ |
817 | kfree(hub->status); |
818 | hub->status = NULL; | |
1da177e4 LT |
819 | |
820 | if (hub->buffer) { | |
821 | usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, | |
822 | hub->buffer_dma); | |
823 | hub->buffer = NULL; | |
824 | } | |
825 | ||
7d069b7d | 826 | kfree(hub); |
1da177e4 LT |
827 | } |
828 | ||
829 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
830 | { | |
831 | struct usb_host_interface *desc; | |
832 | struct usb_endpoint_descriptor *endpoint; | |
833 | struct usb_device *hdev; | |
834 | struct usb_hub *hub; | |
835 | ||
836 | desc = intf->cur_altsetting; | |
837 | hdev = interface_to_usbdev(intf); | |
838 | ||
839 | /* Some hubs have a subclass of 1, which AFAICT according to the */ | |
840 | /* specs is not defined, but it works */ | |
841 | if ((desc->desc.bInterfaceSubClass != 0) && | |
842 | (desc->desc.bInterfaceSubClass != 1)) { | |
843 | descriptor_error: | |
844 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
845 | return -EIO; | |
846 | } | |
847 | ||
848 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
849 | if (desc->desc.bNumEndpoints != 1) | |
850 | goto descriptor_error; | |
851 | ||
852 | endpoint = &desc->endpoint[0].desc; | |
853 | ||
854 | /* Output endpoint? Curiouser and curiouser.. */ | |
855 | if (!(endpoint->bEndpointAddress & USB_DIR_IN)) | |
856 | goto descriptor_error; | |
857 | ||
858 | /* If it's not an interrupt endpoint, we'd better punt! */ | |
859 | if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
860 | != USB_ENDPOINT_XFER_INT) | |
861 | goto descriptor_error; | |
862 | ||
863 | /* We found a hub */ | |
864 | dev_info (&intf->dev, "USB hub found\n"); | |
865 | ||
0a1ef3b5 | 866 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
867 | if (!hub) { |
868 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
869 | return -ENOMEM; | |
870 | } | |
871 | ||
1da177e4 LT |
872 | INIT_LIST_HEAD(&hub->event_list); |
873 | hub->intfdev = &intf->dev; | |
874 | hub->hdev = hdev; | |
875 | INIT_WORK(&hub->leds, led_work, hub); | |
876 | ||
877 | usb_set_intfdata (intf, hub); | |
878 | ||
879 | if (hdev->speed == USB_SPEED_HIGH) | |
880 | highspeed_hubs++; | |
881 | ||
882 | if (hub_configure(hub, endpoint) >= 0) | |
883 | return 0; | |
884 | ||
885 | hub_disconnect (intf); | |
886 | return -ENODEV; | |
887 | } | |
888 | ||
889 | static int | |
890 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
891 | { | |
892 | struct usb_device *hdev = interface_to_usbdev (intf); | |
893 | ||
894 | /* assert ifno == 0 (part of hub spec) */ | |
895 | switch (code) { | |
896 | case USBDEVFS_HUB_PORTINFO: { | |
897 | struct usbdevfs_hub_portinfo *info = user_data; | |
898 | int i; | |
899 | ||
900 | spin_lock_irq(&device_state_lock); | |
901 | if (hdev->devnum <= 0) | |
902 | info->nports = 0; | |
903 | else { | |
904 | info->nports = hdev->maxchild; | |
905 | for (i = 0; i < info->nports; i++) { | |
906 | if (hdev->children[i] == NULL) | |
907 | info->port[i] = 0; | |
908 | else | |
909 | info->port[i] = | |
910 | hdev->children[i]->devnum; | |
911 | } | |
912 | } | |
913 | spin_unlock_irq(&device_state_lock); | |
914 | ||
915 | return info->nports + 1; | |
916 | } | |
917 | ||
918 | default: | |
919 | return -ENOSYS; | |
920 | } | |
921 | } | |
922 | ||
1da177e4 LT |
923 | |
924 | /* grab device/port lock, returning index of that port (zero based). | |
925 | * protects the upstream link used by this device from concurrent | |
926 | * tree operations like suspend, resume, reset, and disconnect, which | |
927 | * apply to everything downstream of a given port. | |
928 | */ | |
929 | static int locktree(struct usb_device *udev) | |
930 | { | |
931 | int t; | |
932 | struct usb_device *hdev; | |
933 | ||
934 | if (!udev) | |
935 | return -ENODEV; | |
936 | ||
937 | /* root hub is always the first lock in the series */ | |
938 | hdev = udev->parent; | |
939 | if (!hdev) { | |
940 | usb_lock_device(udev); | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* on the path from root to us, lock everything from | |
945 | * top down, dropping parent locks when not needed | |
946 | */ | |
947 | t = locktree(hdev); | |
948 | if (t < 0) | |
949 | return t; | |
1da177e4 | 950 | |
12c3da34 AS |
951 | /* everything is fail-fast once disconnect |
952 | * processing starts | |
953 | */ | |
954 | if (udev->state == USB_STATE_NOTATTACHED) { | |
955 | usb_unlock_device(hdev); | |
956 | return -ENODEV; | |
1da177e4 | 957 | } |
12c3da34 AS |
958 | |
959 | /* when everyone grabs locks top->bottom, | |
960 | * non-overlapping work may be concurrent | |
961 | */ | |
962 | usb_lock_device(udev); | |
1da177e4 | 963 | usb_unlock_device(hdev); |
12c3da34 | 964 | return udev->portnum; |
1da177e4 LT |
965 | } |
966 | ||
967 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) | |
968 | { | |
969 | int i; | |
970 | ||
971 | for (i = 0; i < udev->maxchild; ++i) { | |
972 | if (udev->children[i]) | |
973 | recursively_mark_NOTATTACHED(udev->children[i]); | |
974 | } | |
975 | udev->state = USB_STATE_NOTATTACHED; | |
976 | } | |
977 | ||
978 | /** | |
979 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
980 | * @udev: pointer to device whose state should be changed | |
981 | * @new_state: new state value to be stored | |
982 | * | |
983 | * udev->state is _not_ fully protected by the device lock. Although | |
984 | * most transitions are made only while holding the lock, the state can | |
985 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
986 | * is so that devices can be marked as disconnected as soon as possible, | |
987 | * without having to wait for any semaphores to be released. As a result, | |
988 | * all changes to any device's state must be protected by the | |
989 | * device_state_lock spinlock. | |
990 | * | |
991 | * Once a device has been added to the device tree, all changes to its state | |
992 | * should be made using this routine. The state should _not_ be set directly. | |
993 | * | |
994 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
995 | * Otherwise udev->state is set to new_state, and if new_state is | |
996 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
997 | * to USB_STATE_NOTATTACHED. | |
998 | */ | |
999 | void usb_set_device_state(struct usb_device *udev, | |
1000 | enum usb_device_state new_state) | |
1001 | { | |
1002 | unsigned long flags; | |
1003 | ||
1004 | spin_lock_irqsave(&device_state_lock, flags); | |
1005 | if (udev->state == USB_STATE_NOTATTACHED) | |
1006 | ; /* do nothing */ | |
b94dc6b5 | 1007 | else if (new_state != USB_STATE_NOTATTACHED) { |
1da177e4 | 1008 | udev->state = new_state; |
b94dc6b5 DB |
1009 | if (new_state == USB_STATE_CONFIGURED) |
1010 | device_init_wakeup(&udev->dev, | |
1011 | (udev->actconfig->desc.bmAttributes | |
1012 | & USB_CONFIG_ATT_WAKEUP)); | |
1013 | else if (new_state != USB_STATE_SUSPENDED) | |
1014 | device_init_wakeup(&udev->dev, 0); | |
1015 | } else | |
1da177e4 LT |
1016 | recursively_mark_NOTATTACHED(udev); |
1017 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1018 | } | |
1019 | EXPORT_SYMBOL(usb_set_device_state); | |
1020 | ||
1021 | ||
1c50c317 AS |
1022 | #ifdef CONFIG_PM |
1023 | ||
1024 | /** | |
1025 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
1026 | * @rhdev: struct usb_device for the root hub | |
1027 | * | |
1028 | * The USB host controller driver calls this function when its root hub | |
1029 | * is resumed and Vbus power has been interrupted or the controller | |
1030 | * has been reset. The routine marks all the children of the root hub | |
1031 | * as NOTATTACHED and marks logical connect-change events on their ports. | |
1032 | */ | |
1033 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
1034 | { | |
1035 | struct usb_hub *hub; | |
1036 | int port1; | |
1037 | unsigned long flags; | |
1038 | ||
1039 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
1040 | spin_lock_irqsave(&device_state_lock, flags); | |
1041 | hub = hdev_to_hub(rhdev); | |
1042 | for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { | |
1043 | if (rhdev->children[port1 - 1]) { | |
1044 | recursively_mark_NOTATTACHED( | |
1045 | rhdev->children[port1 - 1]); | |
1046 | set_bit(port1, hub->change_bits); | |
1047 | } | |
1048 | } | |
1049 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
1052 | ||
1053 | #endif | |
1054 | ||
1da177e4 LT |
1055 | static void choose_address(struct usb_device *udev) |
1056 | { | |
1057 | int devnum; | |
1058 | struct usb_bus *bus = udev->bus; | |
1059 | ||
1060 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
1061 | ||
1062 | /* Try to allocate the next devnum beginning at bus->devnum_next. */ | |
1063 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1064 | bus->devnum_next); | |
1065 | if (devnum >= 128) | |
1066 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); | |
1067 | ||
1068 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1069 | ||
1070 | if (devnum < 128) { | |
1071 | set_bit(devnum, bus->devmap.devicemap); | |
1072 | udev->devnum = devnum; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | static void release_address(struct usb_device *udev) | |
1077 | { | |
1078 | if (udev->devnum > 0) { | |
1079 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1080 | udev->devnum = -1; | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1086 | * @pdev: pointer to device being disconnected | |
1087 | * Context: !in_interrupt () | |
1088 | * | |
1089 | * Something got disconnected. Get rid of it and all of its children. | |
1090 | * | |
1091 | * If *pdev is a normal device then the parent hub must already be locked. | |
1092 | * If *pdev is a root hub then this routine will acquire the | |
1093 | * usb_bus_list_lock on behalf of the caller. | |
1094 | * | |
1095 | * Only hub drivers (including virtual root hub drivers for host | |
1096 | * controllers) should ever call this. | |
1097 | * | |
1098 | * This call is synchronous, and may not be used in an interrupt context. | |
1099 | */ | |
1100 | void usb_disconnect(struct usb_device **pdev) | |
1101 | { | |
1102 | struct usb_device *udev = *pdev; | |
1103 | int i; | |
1104 | ||
1105 | if (!udev) { | |
1106 | pr_debug ("%s nodev\n", __FUNCTION__); | |
1107 | return; | |
1108 | } | |
1109 | ||
1110 | /* mark the device as inactive, so any further urb submissions for | |
1111 | * this device (and any of its children) will fail immediately. | |
1112 | * this quiesces everyting except pending urbs. | |
1113 | */ | |
1114 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1115 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1116 | ||
9ad3d6cc AS |
1117 | usb_lock_device(udev); |
1118 | ||
1da177e4 LT |
1119 | /* Free up all the children before we remove this device */ |
1120 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1121 | if (udev->children[i]) | |
1122 | usb_disconnect(&udev->children[i]); | |
1123 | } | |
1124 | ||
1125 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1126 | * cleaning up all state associated with the current configuration | |
1127 | * so that the hardware is now fully quiesced. | |
1128 | */ | |
1129 | usb_disable_device(udev, 0); | |
1130 | ||
3099e75a GKH |
1131 | usb_notify_remove_device(udev); |
1132 | ||
1da177e4 LT |
1133 | /* Free the device number, remove the /proc/bus/usb entry and |
1134 | * the sysfs attributes, and delete the parent's children[] | |
1135 | * (or root_hub) pointer. | |
1136 | */ | |
1137 | dev_dbg (&udev->dev, "unregistering device\n"); | |
1138 | release_address(udev); | |
1da177e4 LT |
1139 | usb_remove_sysfs_dev_files(udev); |
1140 | ||
1141 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1142 | spin_lock_irq(&device_state_lock); | |
1143 | *pdev = NULL; | |
1144 | spin_unlock_irq(&device_state_lock); | |
1145 | ||
9ad3d6cc | 1146 | usb_unlock_device(udev); |
1da177e4 LT |
1147 | |
1148 | device_unregister(&udev->dev); | |
1149 | } | |
1150 | ||
55c52718 AS |
1151 | static inline const char *plural(int n) |
1152 | { | |
1153 | return (n == 1 ? "" : "s"); | |
1154 | } | |
1155 | ||
1da177e4 LT |
1156 | static int choose_configuration(struct usb_device *udev) |
1157 | { | |
55c52718 AS |
1158 | int i; |
1159 | u16 devstatus; | |
1160 | int bus_powered; | |
1161 | int num_configs; | |
1162 | struct usb_host_config *c, *best; | |
1163 | ||
1164 | /* If this fails, assume the device is bus-powered */ | |
1165 | devstatus = 0; | |
1166 | usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); | |
1167 | le16_to_cpus(&devstatus); | |
1168 | bus_powered = ((devstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0); | |
1169 | dev_dbg(&udev->dev, "device is %s-powered\n", | |
1170 | bus_powered ? "bus" : "self"); | |
1171 | ||
1172 | best = NULL; | |
1173 | c = udev->config; | |
1174 | num_configs = udev->descriptor.bNumConfigurations; | |
1175 | for (i = 0; i < num_configs; (i++, c++)) { | |
1176 | struct usb_interface_descriptor *desc = | |
1177 | &c->intf_cache[0]->altsetting->desc; | |
1178 | ||
1179 | /* | |
1180 | * HP's USB bus-powered keyboard has only one configuration | |
1181 | * and it claims to be self-powered; other devices may have | |
1182 | * similar errors in their descriptors. If the next test | |
1183 | * were allowed to execute, such configurations would always | |
1184 | * be rejected and the devices would not work as expected. | |
1185 | */ | |
1186 | #if 0 | |
1187 | /* Rule out self-powered configs for a bus-powered device */ | |
1188 | if (bus_powered && (c->desc.bmAttributes & | |
1189 | USB_CONFIG_ATT_SELFPOWER)) | |
1190 | continue; | |
1191 | #endif | |
1da177e4 | 1192 | |
55c52718 AS |
1193 | /* |
1194 | * The next test may not be as effective as it should be. | |
1195 | * Some hubs have errors in their descriptor, claiming | |
1196 | * to be self-powered when they are really bus-powered. | |
1197 | * We will overestimate the amount of current such hubs | |
1198 | * make available for each port. | |
1199 | * | |
1200 | * This is a fairly benign sort of failure. It won't | |
1201 | * cause us to reject configurations that we should have | |
1202 | * accepted. | |
1203 | */ | |
1da177e4 | 1204 | |
55c52718 AS |
1205 | /* Rule out configs that draw too much bus current */ |
1206 | if (c->desc.bMaxPower * 2 > udev->bus_mA) | |
1207 | continue; | |
1da177e4 | 1208 | |
55c52718 AS |
1209 | /* If the first config's first interface is COMM/2/0xff |
1210 | * (MSFT RNDIS), rule it out unless Linux has host-side | |
1211 | * RNDIS support. */ | |
1212 | if (i == 0 && desc->bInterfaceClass == USB_CLASS_COMM | |
1213 | && desc->bInterfaceSubClass == 2 | |
1214 | && desc->bInterfaceProtocol == 0xff) { | |
1215 | #ifndef CONFIG_USB_NET_RNDIS | |
1216 | continue; | |
1217 | #else | |
1218 | best = c; | |
1219 | #endif | |
1220 | } | |
1221 | ||
1222 | /* From the remaining configs, choose the first one whose | |
1223 | * first interface is for a non-vendor-specific class. | |
1224 | * Reason: Linux is more likely to have a class driver | |
1225 | * than a vendor-specific driver. */ | |
1226 | else if (udev->descriptor.bDeviceClass != | |
1227 | USB_CLASS_VENDOR_SPEC && | |
1228 | desc->bInterfaceClass != | |
1229 | USB_CLASS_VENDOR_SPEC) { | |
1230 | best = c; | |
1da177e4 LT |
1231 | break; |
1232 | } | |
55c52718 AS |
1233 | |
1234 | /* If all the remaining configs are vendor-specific, | |
1235 | * choose the first one. */ | |
1236 | else if (!best) | |
1237 | best = c; | |
1238 | } | |
1239 | ||
1240 | if (best) { | |
1241 | i = best->desc.bConfigurationValue; | |
1da177e4 | 1242 | dev_info(&udev->dev, |
55c52718 AS |
1243 | "configuration #%d chosen from %d choice%s\n", |
1244 | i, num_configs, plural(num_configs)); | |
1245 | } else { | |
1246 | i = -1; | |
1247 | dev_warn(&udev->dev, | |
1248 | "no configuration chosen from %d choice%s\n", | |
1249 | num_configs, plural(num_configs)); | |
1da177e4 | 1250 | } |
55c52718 | 1251 | return i; |
1da177e4 LT |
1252 | } |
1253 | ||
1254 | #ifdef DEBUG | |
1255 | static void show_string(struct usb_device *udev, char *id, char *string) | |
1256 | { | |
1257 | if (!string) | |
1258 | return; | |
1259 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1260 | } | |
1261 | ||
1262 | #else | |
1263 | static inline void show_string(struct usb_device *udev, char *id, char *string) | |
1264 | {} | |
1265 | #endif | |
1266 | ||
1da177e4 LT |
1267 | |
1268 | #ifdef CONFIG_USB_OTG | |
1269 | #include "otg_whitelist.h" | |
1270 | #endif | |
1271 | ||
1272 | /** | |
1273 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1274 | * @udev: newly addressed device (in ADDRESS state) | |
1275 | * | |
1276 | * This is called with devices which have been enumerated, but not yet | |
1277 | * configured. The device descriptor is available, but not descriptors | |
9ad3d6cc AS |
1278 | * for any device configuration. The caller must have locked either |
1279 | * the parent hub (if udev is a normal device) or else the | |
1da177e4 LT |
1280 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to |
1281 | * udev has already been installed, but udev is not yet visible through | |
1282 | * sysfs or other filesystem code. | |
1283 | * | |
1284 | * Returns 0 for success (device is configured and listed, with its | |
1285 | * interfaces, in sysfs); else a negative errno value. | |
1286 | * | |
1287 | * This call is synchronous, and may not be used in an interrupt context. | |
1288 | * | |
9ad3d6cc | 1289 | * Only the hub driver or root-hub registrar should ever call this. |
1da177e4 LT |
1290 | */ |
1291 | int usb_new_device(struct usb_device *udev) | |
1292 | { | |
1293 | int err; | |
1294 | int c; | |
1295 | ||
1296 | err = usb_get_configuration(udev); | |
1297 | if (err < 0) { | |
1298 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1299 | err); | |
1300 | goto fail; | |
1301 | } | |
1302 | ||
1303 | /* read the standard strings and cache them if present */ | |
4f62efe6 AS |
1304 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
1305 | udev->manufacturer = usb_cache_string(udev, | |
1306 | udev->descriptor.iManufacturer); | |
1307 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1da177e4 LT |
1308 | |
1309 | /* Tell the world! */ | |
1310 | dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " | |
1311 | "SerialNumber=%d\n", | |
1312 | udev->descriptor.iManufacturer, | |
1313 | udev->descriptor.iProduct, | |
1314 | udev->descriptor.iSerialNumber); | |
1315 | show_string(udev, "Product", udev->product); | |
1316 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1317 | show_string(udev, "SerialNumber", udev->serial); | |
1318 | ||
1319 | #ifdef CONFIG_USB_OTG | |
1320 | /* | |
1321 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1322 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1323 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1324 | */ | |
1325 | if (!udev->bus->is_b_host | |
1326 | && udev->config | |
1327 | && udev->parent == udev->bus->root_hub) { | |
1328 | struct usb_otg_descriptor *desc = 0; | |
1329 | struct usb_bus *bus = udev->bus; | |
1330 | ||
1331 | /* descriptor may appear anywhere in config */ | |
1332 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1333 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1334 | USB_DT_OTG, (void **) &desc) == 0) { | |
1335 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1336 | unsigned port1 = udev->portnum; |
1da177e4 LT |
1337 | struct usb_device *root = udev->parent; |
1338 | ||
1da177e4 LT |
1339 | dev_info(&udev->dev, |
1340 | "Dual-Role OTG device on %sHNP port\n", | |
1341 | (port1 == bus->otg_port) | |
1342 | ? "" : "non-"); | |
1343 | ||
1344 | /* enable HNP before suspend, it's simpler */ | |
1345 | if (port1 == bus->otg_port) | |
1346 | bus->b_hnp_enable = 1; | |
1347 | err = usb_control_msg(udev, | |
1348 | usb_sndctrlpipe(udev, 0), | |
1349 | USB_REQ_SET_FEATURE, 0, | |
1350 | bus->b_hnp_enable | |
1351 | ? USB_DEVICE_B_HNP_ENABLE | |
1352 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1353 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1354 | if (err < 0) { | |
1355 | /* OTG MESSAGE: report errors here, | |
1356 | * customize to match your product. | |
1357 | */ | |
1358 | dev_info(&udev->dev, | |
1359 | "can't set HNP mode; %d\n", | |
1360 | err); | |
1361 | bus->b_hnp_enable = 0; | |
1362 | } | |
1363 | } | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | if (!is_targeted(udev)) { | |
1368 | ||
1369 | /* Maybe it can talk to us, though we can't talk to it. | |
1370 | * (Includes HNP test device.) | |
1371 | */ | |
1372 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
390a8c34 DB |
1373 | static int __usb_suspend_device(struct usb_device *, |
1374 | int port1); | |
1375 | err = __usb_suspend_device(udev, udev->bus->otg_port); | |
1da177e4 LT |
1376 | if (err < 0) |
1377 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1378 | } | |
1379 | err = -ENODEV; | |
1380 | goto fail; | |
1381 | } | |
1382 | #endif | |
1383 | ||
1384 | /* put device-specific files into sysfs */ | |
1385 | err = device_add (&udev->dev); | |
1386 | if (err) { | |
1387 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1388 | goto fail; | |
1389 | } | |
1390 | usb_create_sysfs_dev_files (udev); | |
1391 | ||
9ad3d6cc AS |
1392 | usb_lock_device(udev); |
1393 | ||
1da177e4 LT |
1394 | /* choose and set the configuration. that registers the interfaces |
1395 | * with the driver core, and lets usb device drivers bind to them. | |
1396 | */ | |
1397 | c = choose_configuration(udev); | |
55c52718 | 1398 | if (c >= 0) { |
1da177e4 LT |
1399 | err = usb_set_configuration(udev, c); |
1400 | if (err) { | |
1401 | dev_err(&udev->dev, "can't set config #%d, error %d\n", | |
1402 | c, err); | |
55c52718 AS |
1403 | /* This need not be fatal. The user can try to |
1404 | * set other configurations. */ | |
1da177e4 LT |
1405 | } |
1406 | } | |
1407 | ||
1408 | /* USB device state == configured ... usable */ | |
3099e75a | 1409 | usb_notify_add_device(udev); |
1da177e4 | 1410 | |
9ad3d6cc AS |
1411 | usb_unlock_device(udev); |
1412 | ||
1da177e4 LT |
1413 | return 0; |
1414 | ||
1415 | fail: | |
1416 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1417 | return err; | |
1418 | } | |
1419 | ||
1420 | ||
1421 | static int hub_port_status(struct usb_hub *hub, int port1, | |
1422 | u16 *status, u16 *change) | |
1423 | { | |
1424 | int ret; | |
1425 | ||
1426 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
1427 | if (ret < 0) | |
1428 | dev_err (hub->intfdev, | |
1429 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
1430 | else { | |
1431 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
1432 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
1433 | ret = 0; | |
1434 | } | |
1435 | return ret; | |
1436 | } | |
1437 | ||
1438 | #define PORT_RESET_TRIES 5 | |
1439 | #define SET_ADDRESS_TRIES 2 | |
1440 | #define GET_DESCRIPTOR_TRIES 2 | |
1441 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1442 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1443 | ||
1444 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1445 | #define HUB_SHORT_RESET_TIME 10 | |
1446 | #define HUB_LONG_RESET_TIME 200 | |
1447 | #define HUB_RESET_TIMEOUT 500 | |
1448 | ||
1449 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1450 | struct usb_device *udev, unsigned int delay) | |
1451 | { | |
1452 | int delay_time, ret; | |
1453 | u16 portstatus; | |
1454 | u16 portchange; | |
1455 | ||
1456 | for (delay_time = 0; | |
1457 | delay_time < HUB_RESET_TIMEOUT; | |
1458 | delay_time += delay) { | |
1459 | /* wait to give the device a chance to reset */ | |
1460 | msleep(delay); | |
1461 | ||
1462 | /* read and decode port status */ | |
1463 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1464 | if (ret < 0) | |
1465 | return ret; | |
1466 | ||
1467 | /* Device went away? */ | |
1468 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1469 | return -ENOTCONN; | |
1470 | ||
1471 | /* bomb out completely if something weird happened */ | |
1472 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) | |
1473 | return -EINVAL; | |
1474 | ||
1475 | /* if we`ve finished resetting, then break out of the loop */ | |
1476 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1477 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
1478 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1479 | udev->speed = USB_SPEED_HIGH; | |
1480 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1481 | udev->speed = USB_SPEED_LOW; | |
1482 | else | |
1483 | udev->speed = USB_SPEED_FULL; | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | /* switch to the long delay after two short delay failures */ | |
1488 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1489 | delay = HUB_LONG_RESET_TIME; | |
1490 | ||
1491 | dev_dbg (hub->intfdev, | |
1492 | "port %d not reset yet, waiting %dms\n", | |
1493 | port1, delay); | |
1494 | } | |
1495 | ||
1496 | return -EBUSY; | |
1497 | } | |
1498 | ||
1499 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1500 | struct usb_device *udev, unsigned int delay) | |
1501 | { | |
1502 | int i, status; | |
1503 | ||
1504 | /* Reset the port */ | |
1505 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1506 | status = set_port_feature(hub->hdev, | |
1507 | port1, USB_PORT_FEAT_RESET); | |
1508 | if (status) | |
1509 | dev_err(hub->intfdev, | |
1510 | "cannot reset port %d (err = %d)\n", | |
1511 | port1, status); | |
1512 | else { | |
1513 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1514 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1515 | dev_dbg(hub->intfdev, |
1516 | "port_wait_reset: err = %d\n", | |
1517 | status); | |
1518 | } | |
1519 | ||
1520 | /* return on disconnect or reset */ | |
1521 | switch (status) { | |
1522 | case 0: | |
b789696a DB |
1523 | /* TRSTRCY = 10 ms; plus some extra */ |
1524 | msleep(10 + 40); | |
1da177e4 LT |
1525 | /* FALL THROUGH */ |
1526 | case -ENOTCONN: | |
1527 | case -ENODEV: | |
1528 | clear_port_feature(hub->hdev, | |
1529 | port1, USB_PORT_FEAT_C_RESET); | |
1530 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1531 | usb_set_device_state(udev, status | |
1532 | ? USB_STATE_NOTATTACHED | |
1533 | : USB_STATE_DEFAULT); | |
1534 | return status; | |
1535 | } | |
1536 | ||
1537 | dev_dbg (hub->intfdev, | |
1538 | "port %d not enabled, trying reset again...\n", | |
1539 | port1); | |
1540 | delay = HUB_LONG_RESET_TIME; | |
1541 | } | |
1542 | ||
1543 | dev_err (hub->intfdev, | |
1544 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
1545 | port1); | |
1546 | ||
1547 | return status; | |
1548 | } | |
1549 | ||
1da177e4 LT |
1550 | /* |
1551 | * Disable a port and mark a logical connnect-change event, so that some | |
1552 | * time later khubd will disconnect() any existing usb_device on the port | |
1553 | * and will re-enumerate if there actually is a device attached. | |
1554 | */ | |
1555 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
1556 | { | |
1557 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
1558 | hub_port_disable(hub, port1, 1); | |
1559 | ||
1560 | /* FIXME let caller ask to power down the port: | |
1561 | * - some devices won't enumerate without a VBUS power cycle | |
1562 | * - SRP saves power that way | |
390a8c34 | 1563 | * - ... new call, TBD ... |
1da177e4 LT |
1564 | * That's easy if this hub can switch power per-port, and |
1565 | * khubd reactivates the port later (timer, SRP, etc). | |
1566 | * Powerdown must be optional, because of reset/DFU. | |
1567 | */ | |
1568 | ||
1569 | set_bit(port1, hub->change_bits); | |
1570 | kick_khubd(hub); | |
1571 | } | |
1572 | ||
1573 | ||
1574 | #ifdef CONFIG_USB_SUSPEND | |
1575 | ||
1576 | /* | |
1577 | * Selective port suspend reduces power; most suspended devices draw | |
1578 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
1579 | * All devices below the suspended port are also suspended. | |
1580 | * | |
1581 | * Devices leave suspend state when the host wakes them up. Some devices | |
1582 | * also support "remote wakeup", where the device can activate the USB | |
1583 | * tree above them to deliver data, such as a keypress or packet. In | |
1584 | * some cases, this wakes the USB host. | |
1585 | */ | |
1586 | static int hub_port_suspend(struct usb_hub *hub, int port1, | |
1587 | struct usb_device *udev) | |
1588 | { | |
1589 | int status; | |
1590 | ||
1591 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
1592 | ||
1593 | /* enable remote wakeup when appropriate; this lets the device | |
1594 | * wake up the upstream hub (including maybe the root hub). | |
1595 | * | |
1596 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
1597 | * we don't explicitly enable it here. | |
1598 | */ | |
b94dc6b5 | 1599 | if (device_may_wakeup(&udev->dev)) { |
1da177e4 LT |
1600 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
1601 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
1602 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1603 | NULL, 0, | |
1604 | USB_CTRL_SET_TIMEOUT); | |
1605 | if (status) | |
1606 | dev_dbg(&udev->dev, | |
1607 | "won't remote wakeup, status %d\n", | |
1608 | status); | |
1609 | } | |
1610 | ||
1611 | /* see 7.1.7.6 */ | |
1612 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
1613 | if (status) { | |
1614 | dev_dbg(hub->intfdev, | |
1615 | "can't suspend port %d, status %d\n", | |
1616 | port1, status); | |
1617 | /* paranoia: "should not happen" */ | |
1618 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1619 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
1620 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1621 | NULL, 0, | |
1622 | USB_CTRL_SET_TIMEOUT); | |
1623 | } else { | |
1624 | /* device has up to 10 msec to fully suspend */ | |
1625 | dev_dbg(&udev->dev, "usb suspend\n"); | |
1626 | usb_set_device_state(udev, USB_STATE_SUSPENDED); | |
1627 | msleep(10); | |
1628 | } | |
1629 | return status; | |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
ba9d35fb | 1634 | * to ACPI D2, "may cause the device to lose some context". |
1da177e4 LT |
1635 | * State transitions include: |
1636 | * | |
1637 | * - suspend, resume ... when the VBUS power link stays live | |
1638 | * - suspend, disconnect ... VBUS lost | |
1639 | * | |
1640 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
1641 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
1642 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
1643 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
1644 | * timer, no SRP, no requests through sysfs. | |
390a8c34 DB |
1645 | * |
1646 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
1647 | * the root hub for their bus goes into global suspend ... so we don't | |
1648 | * (falsely) update the device power state to say it suspended. | |
1da177e4 | 1649 | */ |
390a8c34 | 1650 | static int __usb_suspend_device (struct usb_device *udev, int port1) |
1da177e4 | 1651 | { |
f3f3253d | 1652 | int status = 0; |
1da177e4 LT |
1653 | |
1654 | /* caller owns the udev device lock */ | |
1655 | if (port1 < 0) | |
1656 | return port1; | |
1657 | ||
1658 | if (udev->state == USB_STATE_SUSPENDED | |
1659 | || udev->state == USB_STATE_NOTATTACHED) { | |
1660 | return 0; | |
1661 | } | |
1662 | ||
c9f89fa4 | 1663 | /* all interfaces must already be suspended */ |
1da177e4 LT |
1664 | if (udev->actconfig) { |
1665 | int i; | |
1666 | ||
1667 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1668 | struct usb_interface *intf; | |
1da177e4 LT |
1669 | |
1670 | intf = udev->actconfig->interface[i]; | |
c9f89fa4 DB |
1671 | if (is_active(intf)) { |
1672 | dev_dbg(&intf->dev, "nyet suspended\n"); | |
1673 | return -EBUSY; | |
1da177e4 LT |
1674 | } |
1675 | } | |
1676 | } | |
1677 | ||
f3f3253d DB |
1678 | /* we only change a device's upstream USB link. |
1679 | * root hubs have no upstream USB link. | |
1da177e4 | 1680 | */ |
f3f3253d | 1681 | if (udev->parent) |
1da177e4 LT |
1682 | status = hub_port_suspend(hdev_to_hub(udev->parent), port1, |
1683 | udev); | |
1684 | ||
1685 | if (status == 0) | |
390a8c34 | 1686 | udev->dev.power.power_state = PMSG_SUSPEND; |
1da177e4 LT |
1687 | return status; |
1688 | } | |
1689 | ||
f3f3253d DB |
1690 | #endif |
1691 | ||
5edbfb7c | 1692 | /* |
1da177e4 LT |
1693 | * usb_suspend_device - suspend a usb device |
1694 | * @udev: device that's no longer in active use | |
5edbfb7c | 1695 | * Context: must be able to sleep; device not locked; pm locks held |
1da177e4 LT |
1696 | * |
1697 | * Suspends a USB device that isn't in active use, conserving power. | |
1698 | * Devices may wake out of a suspend, if anything important happens, | |
1699 | * using the remote wakeup mechanism. They may also be taken out of | |
1700 | * suspend by the host, using usb_resume_device(). It's also routine | |
1701 | * to disconnect devices while they are suspended. | |
1702 | * | |
390a8c34 DB |
1703 | * This only affects the USB hardware for a device; its interfaces |
1704 | * (and, for hubs, child devices) must already have been suspended. | |
1705 | * | |
1da177e4 LT |
1706 | * Suspending OTG devices may trigger HNP, if that's been enabled |
1707 | * between a pair of dual-role devices. That will change roles, such | |
1708 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
1709 | * | |
1710 | * Returns 0 on success, else negative errno. | |
1711 | */ | |
390a8c34 | 1712 | int usb_suspend_device(struct usb_device *udev) |
1da177e4 | 1713 | { |
f3f3253d | 1714 | #ifdef CONFIG_USB_SUSPEND |
4bf0ba86 AS |
1715 | if (udev->state == USB_STATE_NOTATTACHED) |
1716 | return -ENODEV; | |
12c3da34 | 1717 | return __usb_suspend_device(udev, udev->portnum); |
f3f3253d DB |
1718 | #else |
1719 | /* NOTE: udev->state unchanged, it's not lying ... */ | |
1720 | udev->dev.power.power_state = PMSG_SUSPEND; | |
1721 | return 0; | |
1722 | #endif | |
1da177e4 | 1723 | } |
f3f3253d | 1724 | |
1da177e4 | 1725 | /* |
390a8c34 DB |
1726 | * If the USB "suspend" state is in use (rather than "global suspend"), |
1727 | * many devices will be individually taken out of suspend state using | |
1728 | * special" resume" signaling. These routines kick in shortly after | |
1da177e4 LT |
1729 | * hardware resume signaling is finished, either because of selective |
1730 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
1731 | * in the tree that's rooted at this device. | |
1732 | */ | |
f3f3253d | 1733 | static int finish_device_resume(struct usb_device *udev) |
1da177e4 LT |
1734 | { |
1735 | int status; | |
1736 | u16 devstatus; | |
1737 | ||
1738 | /* caller owns the udev device lock */ | |
f3f3253d | 1739 | dev_dbg(&udev->dev, "finish resume\n"); |
1da177e4 LT |
1740 | |
1741 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
1742 | * state the device resumes to. Linux currently won't see the | |
1743 | * first two on the host side; they'd be inside hub_port_init() | |
1744 | * during many timeouts, but khubd can't suspend until later. | |
1745 | */ | |
1746 | usb_set_device_state(udev, udev->actconfig | |
1747 | ? USB_STATE_CONFIGURED | |
1748 | : USB_STATE_ADDRESS); | |
4bf0ba86 | 1749 | udev->dev.power.power_state = PMSG_ON; |
1da177e4 LT |
1750 | |
1751 | /* 10.5.4.5 says be sure devices in the tree are still there. | |
1752 | * For now let's assume the device didn't go crazy on resume, | |
1753 | * and device drivers will know about any resume quirks. | |
1754 | */ | |
1755 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); | |
55c52718 | 1756 | if (status < 2) |
1da177e4 LT |
1757 | dev_dbg(&udev->dev, |
1758 | "gone after usb resume? status %d\n", | |
1759 | status); | |
1760 | else if (udev->actconfig) { | |
1761 | unsigned i; | |
dbc3887e | 1762 | int (*resume)(struct device *); |
1da177e4 LT |
1763 | |
1764 | le16_to_cpus(&devstatus); | |
55c52718 | 1765 | if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
f3f3253d | 1766 | && udev->parent) { |
1da177e4 LT |
1767 | status = usb_control_msg(udev, |
1768 | usb_sndctrlpipe(udev, 0), | |
1769 | USB_REQ_CLEAR_FEATURE, | |
1770 | USB_RECIP_DEVICE, | |
1771 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1772 | NULL, 0, | |
1773 | USB_CTRL_SET_TIMEOUT); | |
1774 | if (status) { | |
1775 | dev_dbg(&udev->dev, "disable remote " | |
1776 | "wakeup, status %d\n", status); | |
1777 | status = 0; | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | /* resume interface drivers; if this is a hub, it | |
dbc3887e | 1782 | * may have a child resume event to deal with soon |
1da177e4 | 1783 | */ |
dbc3887e | 1784 | resume = udev->dev.bus->resume; |
4bf0ba86 AS |
1785 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
1786 | struct device *dev = | |
1787 | &udev->actconfig->interface[i]->dev; | |
1788 | ||
1789 | down(&dev->sem); | |
1790 | (void) resume(dev); | |
1791 | up(&dev->sem); | |
1792 | } | |
1da177e4 LT |
1793 | status = 0; |
1794 | ||
1795 | } else if (udev->devnum <= 0) { | |
1796 | dev_dbg(&udev->dev, "bogus resume!\n"); | |
1797 | status = -EINVAL; | |
1798 | } | |
1799 | return status; | |
1800 | } | |
1801 | ||
f3f3253d DB |
1802 | #ifdef CONFIG_USB_SUSPEND |
1803 | ||
1da177e4 LT |
1804 | static int |
1805 | hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) | |
1806 | { | |
1807 | int status; | |
1808 | ||
1809 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
1810 | ||
1811 | /* see 7.1.7.7; affects power usage, but not budgeting */ | |
1812 | status = clear_port_feature(hub->hdev, | |
1813 | port1, USB_PORT_FEAT_SUSPEND); | |
1814 | if (status) { | |
1815 | dev_dbg(hub->intfdev, | |
1816 | "can't resume port %d, status %d\n", | |
1817 | port1, status); | |
1818 | } else { | |
1819 | u16 devstatus; | |
1820 | u16 portchange; | |
1821 | ||
1822 | /* drive resume for at least 20 msec */ | |
1823 | if (udev) | |
1824 | dev_dbg(&udev->dev, "RESUME\n"); | |
1825 | msleep(25); | |
1826 | ||
1827 | #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ | |
1828 | | USB_PORT_STAT_ENABLE \ | |
1829 | | USB_PORT_STAT_CONNECTION) | |
1830 | ||
1831 | /* Virtual root hubs can trigger on GET_PORT_STATUS to | |
1832 | * stop resume signaling. Then finish the resume | |
1833 | * sequence. | |
1834 | */ | |
1835 | devstatus = portchange = 0; | |
1836 | status = hub_port_status(hub, port1, | |
1837 | &devstatus, &portchange); | |
1838 | if (status < 0 | |
1839 | || (devstatus & LIVE_FLAGS) != LIVE_FLAGS | |
1840 | || (devstatus & USB_PORT_STAT_SUSPEND) != 0 | |
1841 | ) { | |
1842 | dev_dbg(hub->intfdev, | |
1843 | "port %d status %04x.%04x after resume, %d\n", | |
1844 | port1, portchange, devstatus, status); | |
1845 | } else { | |
1846 | /* TRSMRCY = 10 msec */ | |
1847 | msleep(10); | |
1848 | if (udev) | |
f3f3253d | 1849 | status = finish_device_resume(udev); |
1da177e4 LT |
1850 | } |
1851 | } | |
1852 | if (status < 0) | |
1853 | hub_port_logical_disconnect(hub, port1); | |
1854 | ||
1855 | return status; | |
1856 | } | |
1857 | ||
f3f3253d | 1858 | #endif |
1da177e4 | 1859 | |
5edbfb7c | 1860 | /* |
1da177e4 LT |
1861 | * usb_resume_device - re-activate a suspended usb device |
1862 | * @udev: device to re-activate | |
5edbfb7c | 1863 | * Context: must be able to sleep; device not locked; pm locks held |
1da177e4 LT |
1864 | * |
1865 | * This will re-activate the suspended device, increasing power usage | |
1866 | * while letting drivers communicate again with its endpoints. | |
1867 | * USB resume explicitly guarantees that the power session between | |
1868 | * the host and the device is the same as it was when the device | |
1869 | * suspended. | |
1870 | * | |
1871 | * Returns 0 on success, else negative errno. | |
1872 | */ | |
1873 | int usb_resume_device(struct usb_device *udev) | |
1874 | { | |
12c3da34 | 1875 | int status; |
1da177e4 | 1876 | |
4bf0ba86 AS |
1877 | if (udev->state == USB_STATE_NOTATTACHED) |
1878 | return -ENODEV; | |
1da177e4 | 1879 | |
f3f3253d DB |
1880 | #ifdef CONFIG_USB_SUSPEND |
1881 | /* selective resume of one downstream hub-to-device port */ | |
1882 | if (udev->parent) { | |
1883 | if (udev->state == USB_STATE_SUSPENDED) { | |
1884 | // NOTE swsusp may bork us, device state being wrong... | |
1885 | // NOTE this fails if parent is also suspended... | |
1886 | status = hub_port_resume(hdev_to_hub(udev->parent), | |
12c3da34 | 1887 | udev->portnum, udev); |
1da177e4 | 1888 | } else |
f3f3253d DB |
1889 | status = 0; |
1890 | } else | |
1891 | #endif | |
1892 | status = finish_device_resume(udev); | |
1893 | if (status < 0) | |
1da177e4 LT |
1894 | dev_dbg(&udev->dev, "can't resume, status %d\n", |
1895 | status); | |
1da177e4 | 1896 | |
1da177e4 | 1897 | /* rebind drivers that had no suspend() */ |
4bf0ba86 AS |
1898 | if (status == 0) { |
1899 | usb_unlock_device(udev); | |
1da177e4 | 1900 | bus_rescan_devices(&usb_bus_type); |
4bf0ba86 AS |
1901 | usb_lock_device(udev); |
1902 | } | |
1da177e4 LT |
1903 | return status; |
1904 | } | |
1905 | ||
1906 | static int remote_wakeup(struct usb_device *udev) | |
1907 | { | |
1908 | int status = 0; | |
1909 | ||
f3f3253d DB |
1910 | #ifdef CONFIG_USB_SUSPEND |
1911 | ||
1da177e4 LT |
1912 | /* don't repeat RESUME sequence if this device |
1913 | * was already woken up by some other task | |
1914 | */ | |
9ad3d6cc | 1915 | usb_lock_device(udev); |
1da177e4 LT |
1916 | if (udev->state == USB_STATE_SUSPENDED) { |
1917 | dev_dbg(&udev->dev, "RESUME (wakeup)\n"); | |
1918 | /* TRSMRCY = 10 msec */ | |
1919 | msleep(10); | |
f3f3253d | 1920 | status = finish_device_resume(udev); |
1da177e4 | 1921 | } |
9ad3d6cc | 1922 | usb_unlock_device(udev); |
f3f3253d | 1923 | #endif |
1da177e4 LT |
1924 | return status; |
1925 | } | |
1926 | ||
db690874 | 1927 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
1928 | { |
1929 | struct usb_hub *hub = usb_get_intfdata (intf); | |
1930 | struct usb_device *hdev = hub->hdev; | |
1931 | unsigned port1; | |
1da177e4 | 1932 | |
c9f89fa4 | 1933 | /* fail if children aren't already suspended */ |
1da177e4 LT |
1934 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
1935 | struct usb_device *udev; | |
1936 | ||
1937 | udev = hdev->children [port1-1]; | |
f3f3253d DB |
1938 | if (udev && (udev->dev.power.power_state.event |
1939 | == PM_EVENT_ON | |
1940 | #ifdef CONFIG_USB_SUSPEND | |
1941 | || udev->state != USB_STATE_SUSPENDED | |
1942 | #endif | |
1943 | )) { | |
c9f89fa4 DB |
1944 | dev_dbg(&intf->dev, "port %d nyet suspended\n", port1); |
1945 | return -EBUSY; | |
1946 | } | |
1da177e4 LT |
1947 | } |
1948 | ||
f3f3253d DB |
1949 | /* "global suspend" of the downstream HC-to-USB interface */ |
1950 | if (!hdev->parent) { | |
1951 | struct usb_bus *bus = hdev->bus; | |
0c0382e3 AS |
1952 | if (bus) { |
1953 | int status = hcd_bus_suspend (bus); | |
f3f3253d DB |
1954 | |
1955 | if (status != 0) { | |
1956 | dev_dbg(&hdev->dev, "'global' suspend %d\n", | |
1957 | status); | |
1958 | return status; | |
1959 | } | |
1960 | } else | |
1961 | return -EOPNOTSUPP; | |
1962 | } | |
1963 | ||
c9f89fa4 DB |
1964 | /* stop khubd and related activity */ |
1965 | hub_quiesce(hub); | |
1da177e4 LT |
1966 | return 0; |
1967 | } | |
1968 | ||
1969 | static int hub_resume(struct usb_interface *intf) | |
1970 | { | |
1971 | struct usb_device *hdev = interface_to_usbdev(intf); | |
1972 | struct usb_hub *hub = usb_get_intfdata (intf); | |
1da177e4 LT |
1973 | int status; |
1974 | ||
f3f3253d DB |
1975 | /* "global resume" of the downstream HC-to-USB interface */ |
1976 | if (!hdev->parent) { | |
1977 | struct usb_bus *bus = hdev->bus; | |
0c0382e3 AS |
1978 | if (bus) { |
1979 | status = hcd_bus_resume (bus); | |
f3f3253d DB |
1980 | if (status) { |
1981 | dev_dbg(&intf->dev, "'global' resume %d\n", | |
1982 | status); | |
1983 | return status; | |
1984 | } | |
1985 | } else | |
1986 | return -EOPNOTSUPP; | |
1987 | if (status == 0) { | |
1988 | /* TRSMRCY = 10 msec */ | |
1989 | msleep(10); | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | hub_activate(hub); | |
1994 | ||
1995 | /* REVISIT: this recursion probably shouldn't exist. Remove | |
1996 | * this code sometime, after retesting with different root and | |
1997 | * external hubs. | |
1998 | */ | |
1999 | #ifdef CONFIG_USB_SUSPEND | |
2000 | { | |
2001 | unsigned port1; | |
2002 | ||
1da177e4 LT |
2003 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2004 | struct usb_device *udev; | |
2005 | u16 portstat, portchange; | |
2006 | ||
2007 | udev = hdev->children [port1-1]; | |
2008 | status = hub_port_status(hub, port1, &portstat, &portchange); | |
2009 | if (status == 0) { | |
2010 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
2011 | clear_port_feature(hdev, port1, | |
2012 | USB_PORT_FEAT_C_SUSPEND); | |
2013 | portchange &= ~USB_PORT_STAT_C_SUSPEND; | |
2014 | } | |
2015 | ||
2016 | /* let khubd handle disconnects etc */ | |
2017 | if (portchange) | |
2018 | continue; | |
2019 | } | |
2020 | ||
2021 | if (!udev || status < 0) | |
2022 | continue; | |
9ad3d6cc | 2023 | usb_lock_device(udev); |
1da177e4 LT |
2024 | if (portstat & USB_PORT_STAT_SUSPEND) |
2025 | status = hub_port_resume(hub, port1, udev); | |
2026 | else { | |
f3f3253d | 2027 | status = finish_device_resume(udev); |
1da177e4 LT |
2028 | if (status < 0) { |
2029 | dev_dbg(&intf->dev, "resume port %d --> %d\n", | |
2030 | port1, status); | |
2031 | hub_port_logical_disconnect(hub, port1); | |
2032 | } | |
2033 | } | |
9ad3d6cc | 2034 | usb_unlock_device(udev); |
1da177e4 | 2035 | } |
f3f3253d DB |
2036 | } |
2037 | #endif | |
1da177e4 LT |
2038 | return 0; |
2039 | } | |
2040 | ||
979d5199 DB |
2041 | void usb_suspend_root_hub(struct usb_device *hdev) |
2042 | { | |
2043 | struct usb_hub *hub = hdev_to_hub(hdev); | |
2044 | ||
2045 | /* This also makes any led blinker stop retriggering. We're called | |
2046 | * from irq, so the blinker might still be scheduled. Caller promises | |
2047 | * that the root hub status URB will be canceled. | |
2048 | */ | |
2049 | __hub_quiesce(hub); | |
2050 | mark_quiesced(to_usb_interface(hub->intfdev)); | |
2051 | } | |
2052 | ||
1da177e4 LT |
2053 | void usb_resume_root_hub(struct usb_device *hdev) |
2054 | { | |
2055 | struct usb_hub *hub = hdev_to_hub(hdev); | |
2056 | ||
2057 | hub->resume_root_hub = 1; | |
2058 | kick_khubd(hub); | |
2059 | } | |
2060 | ||
1da177e4 LT |
2061 | |
2062 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2063 | * | |
2064 | * Between connect detection and reset signaling there must be a delay | |
2065 | * of 100ms at least for debounce and power-settling. The corresponding | |
2066 | * timer shall restart whenever the downstream port detects a disconnect. | |
2067 | * | |
2068 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2069 | * low-speed devices for which this debounce period may last over a second. | |
2070 | * Not covered by the spec - but easy to deal with. | |
2071 | * | |
2072 | * This implementation uses a 1500ms total debounce timeout; if the | |
2073 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2074 | * every 25ms for transient disconnects. When the port status has been | |
2075 | * unchanged for 100ms it returns the port status. | |
2076 | */ | |
2077 | ||
2078 | #define HUB_DEBOUNCE_TIMEOUT 1500 | |
2079 | #define HUB_DEBOUNCE_STEP 25 | |
2080 | #define HUB_DEBOUNCE_STABLE 100 | |
2081 | ||
2082 | static int hub_port_debounce(struct usb_hub *hub, int port1) | |
2083 | { | |
2084 | int ret; | |
2085 | int total_time, stable_time = 0; | |
2086 | u16 portchange, portstatus; | |
2087 | unsigned connection = 0xffff; | |
2088 | ||
2089 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2090 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2091 | if (ret < 0) | |
2092 | return ret; | |
2093 | ||
2094 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2095 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2096 | stable_time += HUB_DEBOUNCE_STEP; | |
2097 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2098 | break; | |
2099 | } else { | |
2100 | stable_time = 0; | |
2101 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2102 | } | |
2103 | ||
2104 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2105 | clear_port_feature(hub->hdev, port1, | |
2106 | USB_PORT_FEAT_C_CONNECTION); | |
2107 | } | |
2108 | ||
2109 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2110 | break; | |
2111 | msleep(HUB_DEBOUNCE_STEP); | |
2112 | } | |
2113 | ||
2114 | dev_dbg (hub->intfdev, | |
2115 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2116 | port1, total_time, stable_time, portstatus); | |
2117 | ||
2118 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2119 | return -ETIMEDOUT; | |
2120 | return portstatus; | |
2121 | } | |
2122 | ||
2123 | static void ep0_reinit(struct usb_device *udev) | |
2124 | { | |
2125 | usb_disable_endpoint(udev, 0 + USB_DIR_IN); | |
2126 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT); | |
2127 | udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; | |
2128 | } | |
2129 | ||
2130 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2131 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2132 | ||
2133 | static int hub_set_address(struct usb_device *udev) | |
2134 | { | |
2135 | int retval; | |
2136 | ||
2137 | if (udev->devnum == 0) | |
2138 | return -EINVAL; | |
2139 | if (udev->state == USB_STATE_ADDRESS) | |
2140 | return 0; | |
2141 | if (udev->state != USB_STATE_DEFAULT) | |
2142 | return -EINVAL; | |
2143 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
2144 | USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, | |
2145 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2146 | if (retval == 0) { | |
2147 | usb_set_device_state(udev, USB_STATE_ADDRESS); | |
2148 | ep0_reinit(udev); | |
2149 | } | |
2150 | return retval; | |
2151 | } | |
2152 | ||
2153 | /* Reset device, (re)assign address, get device descriptor. | |
2154 | * Device connection must be stable, no more debouncing needed. | |
2155 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2156 | * | |
2157 | * If this is called for an already-existing device (as part of | |
2158 | * usb_reset_device), the caller must own the device lock. For a | |
2159 | * newly detected device that is not accessible through any global | |
2160 | * pointers, it's not necessary to lock the device. | |
2161 | */ | |
2162 | static int | |
2163 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2164 | int retry_counter) | |
2165 | { | |
4186ecf8 | 2166 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2167 | |
2168 | struct usb_device *hdev = hub->hdev; | |
2169 | int i, j, retval; | |
2170 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2171 | enum usb_device_speed oldspeed = udev->speed; | |
2172 | ||
2173 | /* root hub ports have a slightly longer reset period | |
2174 | * (from USB 2.0 spec, section 7.1.7.5) | |
2175 | */ | |
2176 | if (!hdev->parent) { | |
2177 | delay = HUB_ROOT_RESET_TIME; | |
2178 | if (port1 == hdev->bus->otg_port) | |
2179 | hdev->bus->b_hnp_enable = 0; | |
2180 | } | |
2181 | ||
2182 | /* Some low speed devices have problems with the quick delay, so */ | |
2183 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2184 | if (oldspeed == USB_SPEED_LOW) | |
2185 | delay = HUB_LONG_RESET_TIME; | |
2186 | ||
4186ecf8 | 2187 | mutex_lock(&usb_address0_mutex); |
1da177e4 LT |
2188 | |
2189 | /* Reset the device; full speed may morph to high speed */ | |
2190 | retval = hub_port_reset(hub, port1, udev, delay); | |
2191 | if (retval < 0) /* error or disconnect */ | |
2192 | goto fail; | |
2193 | /* success, speed is known */ | |
2194 | retval = -ENODEV; | |
2195 | ||
2196 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2197 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2198 | goto fail; | |
2199 | } | |
2200 | oldspeed = udev->speed; | |
2201 | ||
2202 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... | |
2203 | * it's fixed size except for full speed devices. | |
2204 | */ | |
2205 | switch (udev->speed) { | |
2206 | case USB_SPEED_HIGH: /* fixed at 64 */ | |
2207 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2208 | break; | |
2209 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2210 | /* to determine the ep0 maxpacket size, try to read | |
2211 | * the device descriptor to get bMaxPacketSize0 and | |
2212 | * then correct our initial guess. | |
2213 | */ | |
2214 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2215 | break; | |
2216 | case USB_SPEED_LOW: /* fixed at 8 */ | |
2217 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); | |
2218 | break; | |
2219 | default: | |
2220 | goto fail; | |
2221 | } | |
2222 | ||
2223 | dev_info (&udev->dev, | |
2224 | "%s %s speed USB device using %s and address %d\n", | |
2225 | (udev->config) ? "reset" : "new", | |
2226 | ({ char *speed; switch (udev->speed) { | |
2227 | case USB_SPEED_LOW: speed = "low"; break; | |
2228 | case USB_SPEED_FULL: speed = "full"; break; | |
2229 | case USB_SPEED_HIGH: speed = "high"; break; | |
2230 | default: speed = "?"; break; | |
2231 | }; speed;}), | |
2232 | udev->bus->controller->driver->name, | |
2233 | udev->devnum); | |
2234 | ||
2235 | /* Set up TT records, if needed */ | |
2236 | if (hdev->tt) { | |
2237 | udev->tt = hdev->tt; | |
2238 | udev->ttport = hdev->ttport; | |
2239 | } else if (udev->speed != USB_SPEED_HIGH | |
2240 | && hdev->speed == USB_SPEED_HIGH) { | |
2241 | udev->tt = &hub->tt; | |
2242 | udev->ttport = port1; | |
2243 | } | |
2244 | ||
2245 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2246 | * Because device hardware and firmware is sometimes buggy in | |
2247 | * this area, and this is how Linux has done it for ages. | |
2248 | * Change it cautiously. | |
2249 | * | |
2250 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2251 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2252 | * so it may help with some non-standards-compliant devices. | |
2253 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2254 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2255 | * value. | |
2256 | */ | |
2257 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
2258 | if (USE_NEW_SCHEME(retry_counter)) { | |
2259 | struct usb_device_descriptor *buf; | |
2260 | int r = 0; | |
2261 | ||
2262 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2263 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2264 | if (!buf) { | |
2265 | retval = -ENOMEM; | |
2266 | continue; | |
2267 | } | |
2268 | ||
2269 | /* Use a short timeout the first time through, | |
2270 | * so that recalcitrant full-speed devices with | |
2271 | * 8- or 16-byte ep0-maxpackets won't slow things | |
2272 | * down tremendously by NAKing the unexpectedly | |
2273 | * early status stage. Also, retry on all errors; | |
2274 | * some devices are flakey. | |
2275 | */ | |
2276 | for (j = 0; j < 3; ++j) { | |
2277 | buf->bMaxPacketSize0 = 0; | |
2278 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2279 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2280 | USB_DT_DEVICE << 8, 0, | |
2281 | buf, GET_DESCRIPTOR_BUFSIZE, | |
2282 | (i ? USB_CTRL_GET_TIMEOUT : 1000)); | |
2283 | switch (buf->bMaxPacketSize0) { | |
2284 | case 8: case 16: case 32: case 64: | |
2285 | if (buf->bDescriptorType == | |
2286 | USB_DT_DEVICE) { | |
2287 | r = 0; | |
2288 | break; | |
2289 | } | |
2290 | /* FALL THROUGH */ | |
2291 | default: | |
2292 | if (r == 0) | |
2293 | r = -EPROTO; | |
2294 | break; | |
2295 | } | |
2296 | if (r == 0) | |
2297 | break; | |
2298 | } | |
2299 | udev->descriptor.bMaxPacketSize0 = | |
2300 | buf->bMaxPacketSize0; | |
2301 | kfree(buf); | |
2302 | ||
2303 | retval = hub_port_reset(hub, port1, udev, delay); | |
2304 | if (retval < 0) /* error or disconnect */ | |
2305 | goto fail; | |
2306 | if (oldspeed != udev->speed) { | |
2307 | dev_dbg(&udev->dev, | |
2308 | "device reset changed speed!\n"); | |
2309 | retval = -ENODEV; | |
2310 | goto fail; | |
2311 | } | |
2312 | if (r) { | |
2313 | dev_err(&udev->dev, "device descriptor " | |
2314 | "read/%s, error %d\n", | |
2315 | "64", r); | |
2316 | retval = -EMSGSIZE; | |
2317 | continue; | |
2318 | } | |
2319 | #undef GET_DESCRIPTOR_BUFSIZE | |
2320 | } | |
2321 | ||
2322 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { | |
2323 | retval = hub_set_address(udev); | |
2324 | if (retval >= 0) | |
2325 | break; | |
2326 | msleep(200); | |
2327 | } | |
2328 | if (retval < 0) { | |
2329 | dev_err(&udev->dev, | |
2330 | "device not accepting address %d, error %d\n", | |
2331 | udev->devnum, retval); | |
2332 | goto fail; | |
2333 | } | |
2334 | ||
2335 | /* cope with hardware quirkiness: | |
2336 | * - let SET_ADDRESS settle, some device hardware wants it | |
2337 | * - read ep0 maxpacket even for high and low speed, | |
2338 | */ | |
2339 | msleep(10); | |
2340 | if (USE_NEW_SCHEME(retry_counter)) | |
2341 | break; | |
2342 | ||
2343 | retval = usb_get_device_descriptor(udev, 8); | |
2344 | if (retval < 8) { | |
2345 | dev_err(&udev->dev, "device descriptor " | |
2346 | "read/%s, error %d\n", | |
2347 | "8", retval); | |
2348 | if (retval >= 0) | |
2349 | retval = -EMSGSIZE; | |
2350 | } else { | |
2351 | retval = 0; | |
2352 | break; | |
2353 | } | |
2354 | } | |
2355 | if (retval) | |
2356 | goto fail; | |
2357 | ||
2358 | i = udev->descriptor.bMaxPacketSize0; | |
2359 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { | |
2360 | if (udev->speed != USB_SPEED_FULL || | |
2361 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2362 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2363 | retval = -EMSGSIZE; | |
2364 | goto fail; | |
2365 | } | |
2366 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2367 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
2368 | ep0_reinit(udev); | |
2369 | } | |
2370 | ||
2371 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2372 | if (retval < (signed)sizeof(udev->descriptor)) { | |
2373 | dev_err(&udev->dev, "device descriptor read/%s, error %d\n", | |
2374 | "all", retval); | |
2375 | if (retval >= 0) | |
2376 | retval = -ENOMSG; | |
2377 | goto fail; | |
2378 | } | |
2379 | ||
2380 | retval = 0; | |
2381 | ||
2382 | fail: | |
2383 | if (retval) | |
2384 | hub_port_disable(hub, port1, 0); | |
4186ecf8 | 2385 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2386 | return retval; |
2387 | } | |
2388 | ||
2389 | static void | |
2390 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2391 | { | |
2392 | struct usb_qualifier_descriptor *qual; | |
2393 | int status; | |
2394 | ||
2395 | qual = kmalloc (sizeof *qual, SLAB_KERNEL); | |
2396 | if (qual == NULL) | |
2397 | return; | |
2398 | ||
2399 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2400 | qual, sizeof *qual); | |
2401 | if (status == sizeof *qual) { | |
2402 | dev_info(&udev->dev, "not running at top speed; " | |
2403 | "connect to a high speed hub\n"); | |
2404 | /* hub LEDs are probably harder to miss than syslog */ | |
2405 | if (hub->has_indicators) { | |
2406 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
2407 | schedule_work (&hub->leds); | |
2408 | } | |
2409 | } | |
1bc3c9e1 | 2410 | kfree(qual); |
1da177e4 LT |
2411 | } |
2412 | ||
2413 | static unsigned | |
2414 | hub_power_remaining (struct usb_hub *hub) | |
2415 | { | |
2416 | struct usb_device *hdev = hub->hdev; | |
2417 | int remaining; | |
55c52718 | 2418 | int port1; |
1da177e4 | 2419 | |
55c52718 | 2420 | if (!hub->limited_power) |
1da177e4 LT |
2421 | return 0; |
2422 | ||
55c52718 AS |
2423 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2424 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2425 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2426 | int delta; | |
1da177e4 LT |
2427 | |
2428 | if (!udev) | |
2429 | continue; | |
2430 | ||
55c52718 AS |
2431 | /* Unconfigured devices may not use more than 100mA, |
2432 | * or 8mA for OTG ports */ | |
1da177e4 | 2433 | if (udev->actconfig) |
55c52718 AS |
2434 | delta = udev->actconfig->desc.bMaxPower * 2; |
2435 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2436 | delta = 100; | |
1da177e4 | 2437 | else |
55c52718 AS |
2438 | delta = 8; |
2439 | if (delta > hub->mA_per_port) | |
2440 | dev_warn(&udev->dev, "%dmA is over %umA budget " | |
2441 | "for port %d!\n", | |
2442 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2443 | remaining -= delta; |
2444 | } | |
2445 | if (remaining < 0) { | |
55c52718 AS |
2446 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2447 | - remaining); | |
1da177e4 LT |
2448 | remaining = 0; |
2449 | } | |
2450 | return remaining; | |
2451 | } | |
2452 | ||
2453 | /* Handle physical or logical connection change events. | |
2454 | * This routine is called when: | |
2455 | * a port connection-change occurs; | |
2456 | * a port enable-change occurs (often caused by EMI); | |
2457 | * usb_reset_device() encounters changed descriptors (as from | |
2458 | * a firmware download) | |
2459 | * caller already locked the hub | |
2460 | */ | |
2461 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2462 | u16 portstatus, u16 portchange) | |
2463 | { | |
2464 | struct usb_device *hdev = hub->hdev; | |
2465 | struct device *hub_dev = hub->intfdev; | |
74ad9bd2 | 2466 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 LT |
2467 | int status, i; |
2468 | ||
2469 | dev_dbg (hub_dev, | |
2470 | "port %d, status %04x, change %04x, %s\n", | |
2471 | port1, portstatus, portchange, portspeed (portstatus)); | |
2472 | ||
2473 | if (hub->has_indicators) { | |
2474 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2475 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2476 | } | |
2477 | ||
2478 | /* Disconnect any existing devices under this port */ | |
2479 | if (hdev->children[port1-1]) | |
2480 | usb_disconnect(&hdev->children[port1-1]); | |
2481 | clear_bit(port1, hub->change_bits); | |
2482 | ||
2483 | #ifdef CONFIG_USB_OTG | |
2484 | /* during HNP, don't repeat the debounce */ | |
2485 | if (hdev->bus->is_b_host) | |
2486 | portchange &= ~USB_PORT_STAT_C_CONNECTION; | |
2487 | #endif | |
2488 | ||
2489 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2490 | status = hub_port_debounce(hub, port1); | |
2491 | if (status < 0) { | |
2492 | dev_err (hub_dev, | |
2493 | "connect-debounce failed, port %d disabled\n", | |
2494 | port1); | |
2495 | goto done; | |
2496 | } | |
2497 | portstatus = status; | |
2498 | } | |
2499 | ||
2500 | /* Return now if nothing is connected */ | |
2501 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { | |
2502 | ||
2503 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2504 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2505 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2506 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
2507 | ||
2508 | if (portstatus & USB_PORT_STAT_ENABLE) | |
2509 | goto done; | |
2510 | return; | |
2511 | } | |
2512 | ||
2513 | #ifdef CONFIG_USB_SUSPEND | |
2514 | /* If something is connected, but the port is suspended, wake it up. */ | |
2515 | if (portstatus & USB_PORT_STAT_SUSPEND) { | |
2516 | status = hub_port_resume(hub, port1, NULL); | |
2517 | if (status < 0) { | |
2518 | dev_dbg(hub_dev, | |
2519 | "can't clear suspend on port %d; %d\n", | |
2520 | port1, status); | |
2521 | goto done; | |
2522 | } | |
2523 | } | |
2524 | #endif | |
2525 | ||
2526 | for (i = 0; i < SET_CONFIG_TRIES; i++) { | |
2527 | struct usb_device *udev; | |
2528 | ||
2529 | /* reallocate for each attempt, since references | |
2530 | * to the previous one can escape in various ways | |
2531 | */ | |
2532 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
2533 | if (!udev) { | |
2534 | dev_err (hub_dev, | |
2535 | "couldn't allocate port %d usb_device\n", | |
2536 | port1); | |
2537 | goto done; | |
2538 | } | |
2539 | ||
2540 | usb_set_device_state(udev, USB_STATE_POWERED); | |
2541 | udev->speed = USB_SPEED_UNKNOWN; | |
55c52718 AS |
2542 | udev->bus_mA = hub->mA_per_port; |
2543 | ||
1da177e4 LT |
2544 | /* set the address */ |
2545 | choose_address(udev); | |
2546 | if (udev->devnum <= 0) { | |
2547 | status = -ENOTCONN; /* Don't retry */ | |
2548 | goto loop; | |
2549 | } | |
2550 | ||
2551 | /* reset and get descriptor */ | |
2552 | status = hub_port_init(hub, udev, port1, i); | |
2553 | if (status < 0) | |
2554 | goto loop; | |
2555 | ||
2556 | /* consecutive bus-powered hubs aren't reliable; they can | |
2557 | * violate the voltage drop budget. if the new child has | |
2558 | * a "powered" LED, users should notice we didn't enable it | |
2559 | * (without reading syslog), even without per-port LEDs | |
2560 | * on the parent. | |
2561 | */ | |
2562 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 2563 | && udev->bus_mA <= 100) { |
1da177e4 LT |
2564 | u16 devstat; |
2565 | ||
2566 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
2567 | &devstat); | |
55c52718 | 2568 | if (status < 2) { |
1da177e4 LT |
2569 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
2570 | goto loop_disable; | |
2571 | } | |
55c52718 | 2572 | le16_to_cpus(&devstat); |
1da177e4 LT |
2573 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
2574 | dev_err(&udev->dev, | |
2575 | "can't connect bus-powered hub " | |
2576 | "to this port\n"); | |
2577 | if (hub->has_indicators) { | |
2578 | hub->indicator[port1-1] = | |
2579 | INDICATOR_AMBER_BLINK; | |
2580 | schedule_work (&hub->leds); | |
2581 | } | |
2582 | status = -ENOTCONN; /* Don't retry */ | |
2583 | goto loop_disable; | |
2584 | } | |
2585 | } | |
2586 | ||
2587 | /* check for devices running slower than they could */ | |
2588 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
2589 | && udev->speed == USB_SPEED_FULL | |
2590 | && highspeed_hubs != 0) | |
2591 | check_highspeed (hub, udev, port1); | |
2592 | ||
2593 | /* Store the parent's children[] pointer. At this point | |
2594 | * udev becomes globally accessible, although presumably | |
2595 | * no one will look at it until hdev is unlocked. | |
2596 | */ | |
1da177e4 LT |
2597 | status = 0; |
2598 | ||
2599 | /* We mustn't add new devices if the parent hub has | |
2600 | * been disconnected; we would race with the | |
2601 | * recursively_mark_NOTATTACHED() routine. | |
2602 | */ | |
2603 | spin_lock_irq(&device_state_lock); | |
2604 | if (hdev->state == USB_STATE_NOTATTACHED) | |
2605 | status = -ENOTCONN; | |
2606 | else | |
2607 | hdev->children[port1-1] = udev; | |
2608 | spin_unlock_irq(&device_state_lock); | |
2609 | ||
2610 | /* Run it through the hoops (find a driver, etc) */ | |
2611 | if (!status) { | |
2612 | status = usb_new_device(udev); | |
2613 | if (status) { | |
2614 | spin_lock_irq(&device_state_lock); | |
2615 | hdev->children[port1-1] = NULL; | |
2616 | spin_unlock_irq(&device_state_lock); | |
2617 | } | |
2618 | } | |
2619 | ||
1da177e4 LT |
2620 | if (status) |
2621 | goto loop_disable; | |
2622 | ||
2623 | status = hub_power_remaining(hub); | |
2624 | if (status) | |
55c52718 | 2625 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
2626 | |
2627 | return; | |
2628 | ||
2629 | loop_disable: | |
2630 | hub_port_disable(hub, port1, 1); | |
2631 | loop: | |
2632 | ep0_reinit(udev); | |
2633 | release_address(udev); | |
2634 | usb_put_dev(udev); | |
2635 | if (status == -ENOTCONN) | |
2636 | break; | |
2637 | } | |
2638 | ||
2639 | done: | |
2640 | hub_port_disable(hub, port1, 1); | |
2641 | } | |
2642 | ||
2643 | static void hub_events(void) | |
2644 | { | |
2645 | struct list_head *tmp; | |
2646 | struct usb_device *hdev; | |
2647 | struct usb_interface *intf; | |
2648 | struct usb_hub *hub; | |
2649 | struct device *hub_dev; | |
2650 | u16 hubstatus; | |
2651 | u16 hubchange; | |
2652 | u16 portstatus; | |
2653 | u16 portchange; | |
2654 | int i, ret; | |
2655 | int connect_change; | |
2656 | ||
2657 | /* | |
2658 | * We restart the list every time to avoid a deadlock with | |
2659 | * deleting hubs downstream from this one. This should be | |
2660 | * safe since we delete the hub from the event list. | |
2661 | * Not the most efficient, but avoids deadlocks. | |
2662 | */ | |
2663 | while (1) { | |
2664 | ||
2665 | /* Grab the first entry at the beginning of the list */ | |
2666 | spin_lock_irq(&hub_event_lock); | |
2667 | if (list_empty(&hub_event_list)) { | |
2668 | spin_unlock_irq(&hub_event_lock); | |
2669 | break; | |
2670 | } | |
2671 | ||
2672 | tmp = hub_event_list.next; | |
2673 | list_del_init(tmp); | |
2674 | ||
2675 | hub = list_entry(tmp, struct usb_hub, event_list); | |
2676 | hdev = hub->hdev; | |
2677 | intf = to_usb_interface(hub->intfdev); | |
2678 | hub_dev = &intf->dev; | |
2679 | ||
979d5199 DB |
2680 | i = hub->resume_root_hub; |
2681 | ||
2682 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n", | |
1da177e4 LT |
2683 | hdev->state, hub->descriptor |
2684 | ? hub->descriptor->bNbrPorts | |
2685 | : 0, | |
2686 | /* NOTE: expects max 15 ports... */ | |
2687 | (u16) hub->change_bits[0], | |
979d5199 DB |
2688 | (u16) hub->event_bits[0], |
2689 | i ? ", resume root" : ""); | |
1da177e4 LT |
2690 | |
2691 | usb_get_intf(intf); | |
1da177e4 LT |
2692 | spin_unlock_irq(&hub_event_lock); |
2693 | ||
979d5199 DB |
2694 | /* Is this is a root hub wanting to reactivate the downstream |
2695 | * ports? If so, be sure the interface resumes even if its | |
2696 | * stub "device" node was never suspended. | |
2697 | */ | |
2698 | if (i) { | |
979d5199 DB |
2699 | dpm_runtime_resume(&hdev->dev); |
2700 | dpm_runtime_resume(&intf->dev); | |
2425e9fe AS |
2701 | usb_put_intf(intf); |
2702 | continue; | |
979d5199 | 2703 | } |
1da177e4 LT |
2704 | |
2705 | /* Lock the device, then check to see if we were | |
2706 | * disconnected while waiting for the lock to succeed. */ | |
2707 | if (locktree(hdev) < 0) { | |
2708 | usb_put_intf(intf); | |
2709 | continue; | |
2710 | } | |
2711 | if (hub != usb_get_intfdata(intf)) | |
2712 | goto loop; | |
2713 | ||
2714 | /* If the hub has died, clean up after it */ | |
2715 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7d069b7d | 2716 | hub_pre_reset(hub, 0); |
1da177e4 LT |
2717 | goto loop; |
2718 | } | |
2719 | ||
2720 | /* If this is an inactive or suspended hub, do nothing */ | |
2721 | if (hub->quiescing) | |
2722 | goto loop; | |
2723 | ||
2724 | if (hub->error) { | |
2725 | dev_dbg (hub_dev, "resetting for error %d\n", | |
2726 | hub->error); | |
2727 | ||
2728 | ret = usb_reset_device(hdev); | |
2729 | if (ret) { | |
2730 | dev_dbg (hub_dev, | |
2731 | "error resetting hub: %d\n", ret); | |
2732 | goto loop; | |
2733 | } | |
2734 | ||
2735 | hub->nerrors = 0; | |
2736 | hub->error = 0; | |
2737 | } | |
2738 | ||
2739 | /* deal with port status changes */ | |
2740 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
2741 | if (test_bit(i, hub->busy_bits)) | |
2742 | continue; | |
2743 | connect_change = test_bit(i, hub->change_bits); | |
2744 | if (!test_and_clear_bit(i, hub->event_bits) && | |
2745 | !connect_change && !hub->activating) | |
2746 | continue; | |
2747 | ||
2748 | ret = hub_port_status(hub, i, | |
2749 | &portstatus, &portchange); | |
2750 | if (ret < 0) | |
2751 | continue; | |
2752 | ||
2753 | if (hub->activating && !hdev->children[i-1] && | |
2754 | (portstatus & | |
2755 | USB_PORT_STAT_CONNECTION)) | |
2756 | connect_change = 1; | |
2757 | ||
2758 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2759 | clear_port_feature(hdev, i, | |
2760 | USB_PORT_FEAT_C_CONNECTION); | |
2761 | connect_change = 1; | |
2762 | } | |
2763 | ||
2764 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
2765 | if (!connect_change) | |
2766 | dev_dbg (hub_dev, | |
2767 | "port %d enable change, " | |
2768 | "status %08x\n", | |
2769 | i, portstatus); | |
2770 | clear_port_feature(hdev, i, | |
2771 | USB_PORT_FEAT_C_ENABLE); | |
2772 | ||
2773 | /* | |
2774 | * EM interference sometimes causes badly | |
2775 | * shielded USB devices to be shutdown by | |
2776 | * the hub, this hack enables them again. | |
2777 | * Works at least with mouse driver. | |
2778 | */ | |
2779 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
2780 | && !connect_change | |
2781 | && hdev->children[i-1]) { | |
2782 | dev_err (hub_dev, | |
2783 | "port %i " | |
2784 | "disabled by hub (EMI?), " | |
2785 | "re-enabling...\n", | |
2786 | i); | |
2787 | connect_change = 1; | |
2788 | } | |
2789 | } | |
2790 | ||
2791 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
2792 | clear_port_feature(hdev, i, | |
2793 | USB_PORT_FEAT_C_SUSPEND); | |
2794 | if (hdev->children[i-1]) { | |
2795 | ret = remote_wakeup(hdev-> | |
2796 | children[i-1]); | |
2797 | if (ret < 0) | |
2798 | connect_change = 1; | |
2799 | } else { | |
2800 | ret = -ENODEV; | |
2801 | hub_port_disable(hub, i, 1); | |
2802 | } | |
2803 | dev_dbg (hub_dev, | |
2804 | "resume on port %d, status %d\n", | |
2805 | i, ret); | |
2806 | } | |
2807 | ||
2808 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
2809 | dev_err (hub_dev, | |
2810 | "over-current change on port %d\n", | |
2811 | i); | |
2812 | clear_port_feature(hdev, i, | |
2813 | USB_PORT_FEAT_C_OVER_CURRENT); | |
2814 | hub_power_on(hub); | |
2815 | } | |
2816 | ||
2817 | if (portchange & USB_PORT_STAT_C_RESET) { | |
2818 | dev_dbg (hub_dev, | |
2819 | "reset change on port %d\n", | |
2820 | i); | |
2821 | clear_port_feature(hdev, i, | |
2822 | USB_PORT_FEAT_C_RESET); | |
2823 | } | |
2824 | ||
2825 | if (connect_change) | |
2826 | hub_port_connect_change(hub, i, | |
2827 | portstatus, portchange); | |
2828 | } /* end for i */ | |
2829 | ||
2830 | /* deal with hub status changes */ | |
2831 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
2832 | ; /* do nothing */ | |
2833 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
2834 | dev_err (hub_dev, "get_hub_status failed\n"); | |
2835 | else { | |
2836 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
2837 | dev_dbg (hub_dev, "power change\n"); | |
2838 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
2839 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
2840 | /* FIXME: Is this always true? */ | |
2841 | hub->limited_power = 0; | |
2842 | else | |
2843 | hub->limited_power = 1; | |
1da177e4 LT |
2844 | } |
2845 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
2846 | dev_dbg (hub_dev, "overcurrent change\n"); | |
2847 | msleep(500); /* Cool down */ | |
2848 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
2849 | hub_power_on(hub); | |
2850 | } | |
2851 | } | |
2852 | ||
2853 | hub->activating = 0; | |
2854 | ||
d5926ae7 AS |
2855 | /* If this is a root hub, tell the HCD it's okay to |
2856 | * re-enable port-change interrupts now. */ | |
2857 | if (!hdev->parent) | |
2858 | usb_enable_root_hub_irq(hdev->bus); | |
2859 | ||
1da177e4 LT |
2860 | loop: |
2861 | usb_unlock_device(hdev); | |
2862 | usb_put_intf(intf); | |
2863 | ||
2864 | } /* end while (1) */ | |
2865 | } | |
2866 | ||
2867 | static int hub_thread(void *__unused) | |
2868 | { | |
1da177e4 LT |
2869 | do { |
2870 | hub_events(); | |
9c8d6178 AM |
2871 | wait_event_interruptible(khubd_wait, |
2872 | !list_empty(&hub_event_list) || | |
2873 | kthread_should_stop()); | |
3e1d1d28 | 2874 | try_to_freeze(); |
9c8d6178 | 2875 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 2876 | |
9c8d6178 AM |
2877 | pr_debug("%s: khubd exiting\n", usbcore_name); |
2878 | return 0; | |
1da177e4 LT |
2879 | } |
2880 | ||
2881 | static struct usb_device_id hub_id_table [] = { | |
2882 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
2883 | .bDeviceClass = USB_CLASS_HUB}, | |
2884 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
2885 | .bInterfaceClass = USB_CLASS_HUB}, | |
2886 | { } /* Terminating entry */ | |
2887 | }; | |
2888 | ||
2889 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
2890 | ||
2891 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
2892 | .name = "hub", |
2893 | .probe = hub_probe, | |
2894 | .disconnect = hub_disconnect, | |
2895 | .suspend = hub_suspend, | |
2896 | .resume = hub_resume, | |
2897 | .ioctl = hub_ioctl, | |
2898 | .id_table = hub_id_table, | |
2899 | }; | |
2900 | ||
2901 | int usb_hub_init(void) | |
2902 | { | |
1da177e4 LT |
2903 | if (usb_register(&hub_driver) < 0) { |
2904 | printk(KERN_ERR "%s: can't register hub driver\n", | |
2905 | usbcore_name); | |
2906 | return -1; | |
2907 | } | |
2908 | ||
9c8d6178 AM |
2909 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
2910 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 2911 | return 0; |
1da177e4 LT |
2912 | |
2913 | /* Fall through if kernel_thread failed */ | |
2914 | usb_deregister(&hub_driver); | |
2915 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
2916 | ||
2917 | return -1; | |
2918 | } | |
2919 | ||
2920 | void usb_hub_cleanup(void) | |
2921 | { | |
9c8d6178 | 2922 | kthread_stop(khubd_task); |
1da177e4 LT |
2923 | |
2924 | /* | |
2925 | * Hub resources are freed for us by usb_deregister. It calls | |
2926 | * usb_driver_purge on every device which in turn calls that | |
2927 | * devices disconnect function if it is using this driver. | |
2928 | * The hub_disconnect function takes care of releasing the | |
2929 | * individual hub resources. -greg | |
2930 | */ | |
2931 | usb_deregister(&hub_driver); | |
2932 | } /* usb_hub_cleanup() */ | |
2933 | ||
1da177e4 LT |
2934 | static int config_descriptors_changed(struct usb_device *udev) |
2935 | { | |
2936 | unsigned index; | |
2937 | unsigned len = 0; | |
2938 | struct usb_config_descriptor *buf; | |
2939 | ||
2940 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2941 | if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) | |
2942 | len = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2943 | } | |
2944 | buf = kmalloc (len, SLAB_KERNEL); | |
2945 | if (buf == NULL) { | |
2946 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
2947 | /* assume the worst */ | |
2948 | return 1; | |
2949 | } | |
2950 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2951 | int length; | |
2952 | int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2953 | ||
2954 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, | |
2955 | old_length); | |
2956 | if (length < old_length) { | |
2957 | dev_dbg(&udev->dev, "config index %d, error %d\n", | |
2958 | index, length); | |
2959 | break; | |
2960 | } | |
2961 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
2962 | != 0) { | |
2963 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
2964 | index, buf->bConfigurationValue); | |
2965 | break; | |
2966 | } | |
2967 | } | |
2968 | kfree(buf); | |
2969 | return index != udev->descriptor.bNumConfigurations; | |
2970 | } | |
2971 | ||
2972 | /** | |
2973 | * usb_reset_device - perform a USB port reset to reinitialize a device | |
2974 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) | |
2975 | * | |
2976 | * WARNING - don't reset any device unless drivers for all of its | |
2977 | * interfaces are expecting that reset! Maybe some driver->reset() | |
2978 | * method should eventually help ensure sufficient cooperation. | |
2979 | * | |
2980 | * Do a port reset, reassign the device's address, and establish its | |
2981 | * former operating configuration. If the reset fails, or the device's | |
2982 | * descriptors change from their values before the reset, or the original | |
2983 | * configuration and altsettings cannot be restored, a flag will be set | |
2984 | * telling khubd to pretend the device has been disconnected and then | |
2985 | * re-connected. All drivers will be unbound, and the device will be | |
2986 | * re-enumerated and probed all over again. | |
2987 | * | |
2988 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
2989 | * flagged for logical disconnection, or some other negative error code | |
2990 | * if the reset wasn't even attempted. | |
2991 | * | |
2992 | * The caller must own the device lock. For example, it's safe to use | |
2993 | * this from a driver probe() routine after downloading new firmware. | |
2994 | * For calls that might not occur during probe(), drivers should lock | |
2995 | * the device using usb_lock_device_for_reset(). | |
2996 | */ | |
2997 | int usb_reset_device(struct usb_device *udev) | |
2998 | { | |
2999 | struct usb_device *parent_hdev = udev->parent; | |
3000 | struct usb_hub *parent_hub; | |
3001 | struct usb_device_descriptor descriptor = udev->descriptor; | |
3002 | struct usb_hub *hub = NULL; | |
12c3da34 AS |
3003 | int i, ret = 0; |
3004 | int port1 = udev->portnum; | |
1da177e4 LT |
3005 | |
3006 | if (udev->state == USB_STATE_NOTATTACHED || | |
3007 | udev->state == USB_STATE_SUSPENDED) { | |
3008 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3009 | udev->state); | |
3010 | return -EINVAL; | |
3011 | } | |
3012 | ||
3013 | if (!parent_hdev) { | |
3014 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
3015 | dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); | |
3016 | return -EISDIR; | |
3017 | } | |
1da177e4 LT |
3018 | parent_hub = hdev_to_hub(parent_hdev); |
3019 | ||
3020 | /* If we're resetting an active hub, take some special actions */ | |
3021 | if (udev->actconfig && | |
3022 | udev->actconfig->interface[0]->dev.driver == | |
3023 | &hub_driver.driver && | |
3024 | (hub = hdev_to_hub(udev)) != NULL) { | |
7d069b7d | 3025 | hub_pre_reset(hub, 0); |
1da177e4 LT |
3026 | } |
3027 | ||
3028 | set_bit(port1, parent_hub->busy_bits); | |
3029 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3030 | ||
3031 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3032 | * Other endpoints will be handled by re-enumeration. */ | |
3033 | ep0_reinit(udev); | |
3034 | ret = hub_port_init(parent_hub, udev, port1, i); | |
3035 | if (ret >= 0) | |
3036 | break; | |
3037 | } | |
3038 | clear_bit(port1, parent_hub->busy_bits); | |
3039 | if (ret < 0) | |
3040 | goto re_enumerate; | |
3041 | ||
3042 | /* Device might have changed firmware (DFU or similar) */ | |
3043 | if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) | |
3044 | || config_descriptors_changed (udev)) { | |
3045 | dev_info(&udev->dev, "device firmware changed\n"); | |
3046 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3047 | goto re_enumerate; | |
3048 | } | |
3049 | ||
3050 | if (!udev->actconfig) | |
3051 | goto done; | |
3052 | ||
3053 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3054 | USB_REQ_SET_CONFIGURATION, 0, | |
3055 | udev->actconfig->desc.bConfigurationValue, 0, | |
3056 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3057 | if (ret < 0) { | |
3058 | dev_err(&udev->dev, | |
3059 | "can't restore configuration #%d (error=%d)\n", | |
3060 | udev->actconfig->desc.bConfigurationValue, ret); | |
3061 | goto re_enumerate; | |
3062 | } | |
3063 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3064 | ||
3065 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
3066 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3067 | struct usb_interface_descriptor *desc; | |
3068 | ||
3069 | /* set_interface resets host side toggle even | |
3070 | * for altsetting zero. the interface may have no driver. | |
3071 | */ | |
3072 | desc = &intf->cur_altsetting->desc; | |
3073 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3074 | desc->bAlternateSetting); | |
3075 | if (ret < 0) { | |
3076 | dev_err(&udev->dev, "failed to restore interface %d " | |
3077 | "altsetting %d (error=%d)\n", | |
3078 | desc->bInterfaceNumber, | |
3079 | desc->bAlternateSetting, | |
3080 | ret); | |
3081 | goto re_enumerate; | |
3082 | } | |
3083 | } | |
3084 | ||
3085 | done: | |
3086 | if (hub) | |
3087 | hub_post_reset(hub); | |
3088 | return 0; | |
3089 | ||
3090 | re_enumerate: | |
3091 | hub_port_logical_disconnect(parent_hub, port1); | |
3092 | return -ENODEV; | |
3093 | } |