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Commit | Line | Data |
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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 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/ioctl.h> | |
21 | #include <linux/usb.h> | |
22 | #include <linux/usbdevice_fs.h> | |
9c8d6178 | 23 | #include <linux/kthread.h> |
4186ecf8 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | |
26 | #include <asm/semaphore.h> | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/byteorder.h> | |
29 | ||
30 | #include "usb.h" | |
31 | #include "hcd.h" | |
32 | #include "hub.h" | |
33 | ||
1bb5f66b AS |
34 | struct usb_hub { |
35 | struct device *intfdev; /* the "interface" device */ | |
36 | struct usb_device *hdev; | |
37 | struct urb *urb; /* for interrupt polling pipe */ | |
38 | ||
39 | /* buffer for urb ... with extra space in case of babble */ | |
40 | char (*buffer)[8]; | |
41 | dma_addr_t buffer_dma; /* DMA address for buffer */ | |
42 | union { | |
43 | struct usb_hub_status hub; | |
44 | struct usb_port_status port; | |
45 | } *status; /* buffer for status reports */ | |
46 | ||
47 | int error; /* last reported error */ | |
48 | int nerrors; /* track consecutive errors */ | |
49 | ||
50 | struct list_head event_list; /* hubs w/data or errs ready */ | |
51 | unsigned long event_bits[1]; /* status change bitmask */ | |
52 | unsigned long change_bits[1]; /* ports with logical connect | |
53 | status change */ | |
54 | unsigned long busy_bits[1]; /* ports being reset or | |
55 | resumed */ | |
56 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ | |
57 | #error event_bits[] is too short! | |
58 | #endif | |
59 | ||
60 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
61 | struct usb_tt tt; /* Transaction Translator */ | |
62 | ||
63 | unsigned mA_per_port; /* current for each child */ | |
64 | ||
65 | unsigned limited_power:1; | |
66 | unsigned quiescing:1; | |
67 | unsigned activating:1; | |
1bb5f66b AS |
68 | |
69 | unsigned has_indicators:1; | |
70 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 71 | struct delayed_work leds; |
1bb5f66b AS |
72 | }; |
73 | ||
74 | ||
1da177e4 | 75 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 76 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
77 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
78 | static DEFINE_SPINLOCK(device_state_lock); | |
79 | ||
80 | /* khubd's worklist and its lock */ | |
81 | static DEFINE_SPINLOCK(hub_event_lock); | |
82 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
83 | ||
84 | /* Wakes up khubd */ | |
85 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
86 | ||
9c8d6178 | 87 | static struct task_struct *khubd_task; |
1da177e4 | 88 | |
c066475e GKH |
89 | /* multithreaded probe logic */ |
90 | static int multithread_probe = | |
91 | #ifdef CONFIG_USB_MULTITHREAD_PROBE | |
92 | 1; | |
93 | #else | |
94 | 0; | |
95 | #endif | |
96 | module_param(multithread_probe, bool, S_IRUGO); | |
97 | MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread"); | |
98 | ||
1da177e4 LT |
99 | /* cycle leds on hubs that aren't blinking for attention */ |
100 | static int blinkenlights = 0; | |
101 | module_param (blinkenlights, bool, S_IRUGO); | |
102 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
103 | ||
104 | /* | |
105 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
106 | * closely resembles the way Windows works. Hopefully it will be compatible | |
107 | * with a wider range of devices than the old scheme. However some previously | |
108 | * working devices may start giving rise to "device not accepting address" | |
109 | * errors; if that happens the user can try the old scheme by adjusting the | |
110 | * following module parameters. | |
111 | * | |
112 | * For maximum flexibility there are two boolean parameters to control the | |
113 | * hub driver's behavior. On the first initialization attempt, if the | |
114 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
115 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
116 | * is set, then the driver will make another attempt, using the other scheme. | |
117 | */ | |
118 | static int old_scheme_first = 0; | |
119 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
120 | MODULE_PARM_DESC(old_scheme_first, | |
121 | "start with the old device initialization scheme"); | |
122 | ||
123 | static int use_both_schemes = 1; | |
124 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
125 | MODULE_PARM_DESC(use_both_schemes, | |
126 | "try the other device initialization scheme if the " | |
127 | "first one fails"); | |
128 | ||
129 | ||
130 | #ifdef DEBUG | |
131 | static inline char *portspeed (int portstatus) | |
132 | { | |
133 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
134 | return "480 Mb/s"; | |
135 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
136 | return "1.5 Mb/s"; | |
137 | else | |
138 | return "12 Mb/s"; | |
139 | } | |
140 | #endif | |
141 | ||
142 | /* Note that hdev or one of its children must be locked! */ | |
143 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) | |
144 | { | |
145 | return usb_get_intfdata(hdev->actconfig->interface[0]); | |
146 | } | |
147 | ||
148 | /* USB 2.0 spec Section 11.24.4.5 */ | |
149 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
150 | { | |
151 | int i, ret; | |
152 | ||
153 | for (i = 0; i < 3; i++) { | |
154 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
155 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
156 | USB_DT_HUB << 8, 0, data, size, | |
157 | USB_CTRL_GET_TIMEOUT); | |
158 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
159 | return ret; | |
160 | } | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | /* | |
165 | * USB 2.0 spec Section 11.24.2.1 | |
166 | */ | |
167 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
168 | { | |
169 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
170 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
171 | } | |
172 | ||
173 | /* | |
174 | * USB 2.0 spec Section 11.24.2.2 | |
175 | */ | |
176 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
177 | { | |
178 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
179 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
180 | NULL, 0, 1000); | |
181 | } | |
182 | ||
183 | /* | |
184 | * USB 2.0 spec Section 11.24.2.13 | |
185 | */ | |
186 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
187 | { | |
188 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
189 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
190 | NULL, 0, 1000); | |
191 | } | |
192 | ||
193 | /* | |
194 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
195 | * for info about using port indicators | |
196 | */ | |
197 | static void set_port_led( | |
198 | struct usb_hub *hub, | |
199 | int port1, | |
200 | int selector | |
201 | ) | |
202 | { | |
203 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
204 | USB_PORT_FEAT_INDICATOR); | |
205 | if (status < 0) | |
206 | dev_dbg (hub->intfdev, | |
207 | "port %d indicator %s status %d\n", | |
208 | port1, | |
209 | ({ char *s; switch (selector) { | |
210 | case HUB_LED_AMBER: s = "amber"; break; | |
211 | case HUB_LED_GREEN: s = "green"; break; | |
212 | case HUB_LED_OFF: s = "off"; break; | |
213 | case HUB_LED_AUTO: s = "auto"; break; | |
214 | default: s = "??"; break; | |
215 | }; s; }), | |
216 | status); | |
217 | } | |
218 | ||
219 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
220 | ||
c4028958 | 221 | static void led_work (struct work_struct *work) |
1da177e4 | 222 | { |
c4028958 DH |
223 | struct usb_hub *hub = |
224 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
225 | struct usb_device *hdev = hub->hdev; |
226 | unsigned i; | |
227 | unsigned changed = 0; | |
228 | int cursor = -1; | |
229 | ||
230 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
231 | return; | |
232 | ||
233 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
234 | unsigned selector, mode; | |
235 | ||
236 | /* 30%-50% duty cycle */ | |
237 | ||
238 | switch (hub->indicator[i]) { | |
239 | /* cycle marker */ | |
240 | case INDICATOR_CYCLE: | |
241 | cursor = i; | |
242 | selector = HUB_LED_AUTO; | |
243 | mode = INDICATOR_AUTO; | |
244 | break; | |
245 | /* blinking green = sw attention */ | |
246 | case INDICATOR_GREEN_BLINK: | |
247 | selector = HUB_LED_GREEN; | |
248 | mode = INDICATOR_GREEN_BLINK_OFF; | |
249 | break; | |
250 | case INDICATOR_GREEN_BLINK_OFF: | |
251 | selector = HUB_LED_OFF; | |
252 | mode = INDICATOR_GREEN_BLINK; | |
253 | break; | |
254 | /* blinking amber = hw attention */ | |
255 | case INDICATOR_AMBER_BLINK: | |
256 | selector = HUB_LED_AMBER; | |
257 | mode = INDICATOR_AMBER_BLINK_OFF; | |
258 | break; | |
259 | case INDICATOR_AMBER_BLINK_OFF: | |
260 | selector = HUB_LED_OFF; | |
261 | mode = INDICATOR_AMBER_BLINK; | |
262 | break; | |
263 | /* blink green/amber = reserved */ | |
264 | case INDICATOR_ALT_BLINK: | |
265 | selector = HUB_LED_GREEN; | |
266 | mode = INDICATOR_ALT_BLINK_OFF; | |
267 | break; | |
268 | case INDICATOR_ALT_BLINK_OFF: | |
269 | selector = HUB_LED_AMBER; | |
270 | mode = INDICATOR_ALT_BLINK; | |
271 | break; | |
272 | default: | |
273 | continue; | |
274 | } | |
275 | if (selector != HUB_LED_AUTO) | |
276 | changed = 1; | |
277 | set_port_led(hub, i + 1, selector); | |
278 | hub->indicator[i] = mode; | |
279 | } | |
280 | if (!changed && blinkenlights) { | |
281 | cursor++; | |
282 | cursor %= hub->descriptor->bNbrPorts; | |
283 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
284 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
285 | changed++; | |
286 | } | |
287 | if (changed) | |
288 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
289 | } | |
290 | ||
291 | /* use a short timeout for hub/port status fetches */ | |
292 | #define USB_STS_TIMEOUT 1000 | |
293 | #define USB_STS_RETRIES 5 | |
294 | ||
295 | /* | |
296 | * USB 2.0 spec Section 11.24.2.6 | |
297 | */ | |
298 | static int get_hub_status(struct usb_device *hdev, | |
299 | struct usb_hub_status *data) | |
300 | { | |
301 | int i, status = -ETIMEDOUT; | |
302 | ||
303 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
304 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
305 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
306 | data, sizeof(*data), USB_STS_TIMEOUT); | |
307 | } | |
308 | return status; | |
309 | } | |
310 | ||
311 | /* | |
312 | * USB 2.0 spec Section 11.24.2.7 | |
313 | */ | |
314 | static int get_port_status(struct usb_device *hdev, int port1, | |
315 | struct usb_port_status *data) | |
316 | { | |
317 | int i, status = -ETIMEDOUT; | |
318 | ||
319 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
320 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
321 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
322 | data, sizeof(*data), USB_STS_TIMEOUT); | |
323 | } | |
324 | return status; | |
325 | } | |
326 | ||
327 | static void kick_khubd(struct usb_hub *hub) | |
328 | { | |
329 | unsigned long flags; | |
330 | ||
40f122f3 AS |
331 | /* Suppress autosuspend until khubd runs */ |
332 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; | |
333 | ||
1da177e4 LT |
334 | spin_lock_irqsave(&hub_event_lock, flags); |
335 | if (list_empty(&hub->event_list)) { | |
336 | list_add_tail(&hub->event_list, &hub_event_list); | |
337 | wake_up(&khubd_wait); | |
338 | } | |
339 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
340 | } | |
341 | ||
342 | void usb_kick_khubd(struct usb_device *hdev) | |
343 | { | |
344 | kick_khubd(hdev_to_hub(hdev)); | |
345 | } | |
346 | ||
347 | ||
348 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 349 | static void hub_irq(struct urb *urb) |
1da177e4 | 350 | { |
ec17cf1c | 351 | struct usb_hub *hub = urb->context; |
1da177e4 LT |
352 | int status; |
353 | int i; | |
354 | unsigned long bits; | |
355 | ||
356 | switch (urb->status) { | |
357 | case -ENOENT: /* synchronous unlink */ | |
358 | case -ECONNRESET: /* async unlink */ | |
359 | case -ESHUTDOWN: /* hardware going away */ | |
360 | return; | |
361 | ||
362 | default: /* presumably an error */ | |
363 | /* Cause a hub reset after 10 consecutive errors */ | |
364 | dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); | |
365 | if ((++hub->nerrors < 10) || hub->error) | |
366 | goto resubmit; | |
367 | hub->error = urb->status; | |
368 | /* FALL THROUGH */ | |
ec17cf1c | 369 | |
1da177e4 LT |
370 | /* let khubd handle things */ |
371 | case 0: /* we got data: port status changed */ | |
372 | bits = 0; | |
373 | for (i = 0; i < urb->actual_length; ++i) | |
374 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
375 | << (i*8); | |
376 | hub->event_bits[0] = bits; | |
377 | break; | |
378 | } | |
379 | ||
380 | hub->nerrors = 0; | |
381 | ||
382 | /* Something happened, let khubd figure it out */ | |
383 | kick_khubd(hub); | |
384 | ||
385 | resubmit: | |
386 | if (hub->quiescing) | |
387 | return; | |
388 | ||
389 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
390 | && status != -ENODEV && status != -EPERM) | |
391 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
392 | } | |
393 | ||
394 | /* USB 2.0 spec Section 11.24.2.3 */ | |
395 | static inline int | |
396 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
397 | { | |
398 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
399 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
400 | tt, NULL, 0, 1000); | |
401 | } | |
402 | ||
403 | /* | |
404 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
405 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
406 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
407 | * both can talk to the same hub concurrently. | |
408 | */ | |
c4028958 | 409 | static void hub_tt_kevent (struct work_struct *work) |
1da177e4 | 410 | { |
c4028958 DH |
411 | struct usb_hub *hub = |
412 | container_of(work, struct usb_hub, tt.kevent); | |
1da177e4 LT |
413 | unsigned long flags; |
414 | ||
415 | spin_lock_irqsave (&hub->tt.lock, flags); | |
416 | while (!list_empty (&hub->tt.clear_list)) { | |
417 | struct list_head *temp; | |
418 | struct usb_tt_clear *clear; | |
419 | struct usb_device *hdev = hub->hdev; | |
420 | int status; | |
421 | ||
422 | temp = hub->tt.clear_list.next; | |
423 | clear = list_entry (temp, struct usb_tt_clear, clear_list); | |
424 | list_del (&clear->clear_list); | |
425 | ||
426 | /* drop lock so HCD can concurrently report other TT errors */ | |
427 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
428 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
429 | spin_lock_irqsave (&hub->tt.lock, flags); | |
430 | ||
431 | if (status) | |
432 | dev_err (&hdev->dev, | |
433 | "clear tt %d (%04x) error %d\n", | |
434 | clear->tt, clear->devinfo, status); | |
1bc3c9e1 | 435 | kfree(clear); |
1da177e4 LT |
436 | } |
437 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
438 | } | |
439 | ||
440 | /** | |
441 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub | |
442 | * @udev: the device whose split transaction failed | |
443 | * @pipe: identifies the endpoint of the failed transaction | |
444 | * | |
445 | * High speed HCDs use this to tell the hub driver that some split control or | |
446 | * bulk transaction failed in a way that requires clearing internal state of | |
447 | * a transaction translator. This is normally detected (and reported) from | |
448 | * interrupt context. | |
449 | * | |
450 | * It may not be possible for that hub to handle additional full (or low) | |
451 | * speed transactions until that state is fully cleared out. | |
452 | */ | |
453 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) | |
454 | { | |
455 | struct usb_tt *tt = udev->tt; | |
456 | unsigned long flags; | |
457 | struct usb_tt_clear *clear; | |
458 | ||
459 | /* we've got to cope with an arbitrary number of pending TT clears, | |
460 | * since each TT has "at least two" buffers that can need it (and | |
461 | * there can be many TTs per hub). even if they're uncommon. | |
462 | */ | |
463 | if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { | |
464 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); | |
465 | /* FIXME recover somehow ... RESET_TT? */ | |
466 | return; | |
467 | } | |
468 | ||
469 | /* info that CLEAR_TT_BUFFER needs */ | |
470 | clear->tt = tt->multi ? udev->ttport : 1; | |
471 | clear->devinfo = usb_pipeendpoint (pipe); | |
472 | clear->devinfo |= udev->devnum << 4; | |
473 | clear->devinfo |= usb_pipecontrol (pipe) | |
474 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
475 | : (USB_ENDPOINT_XFER_BULK << 11); | |
476 | if (usb_pipein (pipe)) | |
477 | clear->devinfo |= 1 << 15; | |
478 | ||
479 | /* tell keventd to clear state for this TT */ | |
480 | spin_lock_irqsave (&tt->lock, flags); | |
481 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
482 | schedule_work (&tt->kevent); | |
483 | spin_unlock_irqrestore (&tt->lock, flags); | |
484 | } | |
485 | ||
486 | static void hub_power_on(struct usb_hub *hub) | |
487 | { | |
488 | int port1; | |
b789696a | 489 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
4489a571 AS |
490 | u16 wHubCharacteristics = |
491 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
492 | ||
493 | /* Enable power on each port. Some hubs have reserved values | |
494 | * of LPSM (> 2) in their descriptors, even though they are | |
495 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
496 | * but only emulate it. In all cases, the ports won't work | |
497 | * unless we send these messages to the hub. | |
498 | */ | |
499 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 500 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
501 | else |
502 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
503 | "non-switchable hub\n"); | |
504 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
505 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 506 | |
b789696a DB |
507 | /* Wait at least 100 msec for power to become stable */ |
508 | msleep(max(pgood_delay, (unsigned) 100)); | |
1da177e4 LT |
509 | } |
510 | ||
02c399ee | 511 | static void hub_quiesce(struct usb_hub *hub) |
1da177e4 | 512 | { |
979d5199 | 513 | /* (nonblocking) khubd and related activity won't re-trigger */ |
1da177e4 | 514 | hub->quiescing = 1; |
c9f89fa4 | 515 | hub->activating = 0; |
979d5199 | 516 | |
979d5199 | 517 | /* (blocking) stop khubd and related activity */ |
1da177e4 LT |
518 | usb_kill_urb(hub->urb); |
519 | if (hub->has_indicators) | |
520 | cancel_delayed_work(&hub->leds); | |
521 | if (hub->has_indicators || hub->tt.hub) | |
522 | flush_scheduled_work(); | |
523 | } | |
524 | ||
525 | static void hub_activate(struct usb_hub *hub) | |
526 | { | |
527 | int status; | |
528 | ||
529 | hub->quiescing = 0; | |
530 | hub->activating = 1; | |
40f122f3 | 531 | |
1da177e4 LT |
532 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
533 | if (status < 0) | |
534 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
535 | if (hub->has_indicators && blinkenlights) | |
536 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
537 | ||
538 | /* scan all ports ASAP */ | |
539 | kick_khubd(hub); | |
540 | } | |
541 | ||
542 | static int hub_hub_status(struct usb_hub *hub, | |
543 | u16 *status, u16 *change) | |
544 | { | |
545 | int ret; | |
546 | ||
547 | ret = get_hub_status(hub->hdev, &hub->status->hub); | |
548 | if (ret < 0) | |
549 | dev_err (hub->intfdev, | |
550 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
551 | else { | |
552 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
553 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
554 | ret = 0; | |
555 | } | |
556 | return ret; | |
557 | } | |
558 | ||
8b28c752 AS |
559 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
560 | { | |
561 | struct usb_device *hdev = hub->hdev; | |
562 | int ret; | |
563 | ||
564 | if (hdev->children[port1-1] && set_state) { | |
565 | usb_set_device_state(hdev->children[port1-1], | |
566 | USB_STATE_NOTATTACHED); | |
567 | } | |
568 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
569 | if (ret) | |
570 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
571 | port1, ret); | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
7d069b7d AS |
576 | |
577 | /* caller has locked the hub device */ | |
7de18d8b | 578 | static void hub_pre_reset(struct usb_interface *intf) |
7d069b7d | 579 | { |
7de18d8b | 580 | struct usb_hub *hub = usb_get_intfdata(intf); |
7d069b7d AS |
581 | struct usb_device *hdev = hub->hdev; |
582 | int port1; | |
583 | ||
584 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
585 | if (hdev->children[port1 - 1]) { | |
586 | usb_disconnect(&hdev->children[port1 - 1]); | |
7de18d8b | 587 | if (hub->error == 0) |
7d069b7d AS |
588 | hub_port_disable(hub, port1, 0); |
589 | } | |
590 | } | |
591 | hub_quiesce(hub); | |
592 | } | |
593 | ||
594 | /* caller has locked the hub device */ | |
7de18d8b | 595 | static void hub_post_reset(struct usb_interface *intf) |
7d069b7d | 596 | { |
7de18d8b AS |
597 | struct usb_hub *hub = usb_get_intfdata(intf); |
598 | ||
7d069b7d AS |
599 | hub_activate(hub); |
600 | hub_power_on(hub); | |
601 | } | |
602 | ||
603 | ||
1da177e4 LT |
604 | static int hub_configure(struct usb_hub *hub, |
605 | struct usb_endpoint_descriptor *endpoint) | |
606 | { | |
607 | struct usb_device *hdev = hub->hdev; | |
608 | struct device *hub_dev = hub->intfdev; | |
609 | u16 hubstatus, hubchange; | |
74ad9bd2 | 610 | u16 wHubCharacteristics; |
1da177e4 LT |
611 | unsigned int pipe; |
612 | int maxp, ret; | |
613 | char *message; | |
614 | ||
615 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
616 | &hub->buffer_dma); | |
617 | if (!hub->buffer) { | |
618 | message = "can't allocate hub irq buffer"; | |
619 | ret = -ENOMEM; | |
620 | goto fail; | |
621 | } | |
622 | ||
623 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
624 | if (!hub->status) { | |
625 | message = "can't kmalloc hub status buffer"; | |
626 | ret = -ENOMEM; | |
627 | goto fail; | |
628 | } | |
629 | ||
630 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
631 | if (!hub->descriptor) { | |
632 | message = "can't kmalloc hub descriptor"; | |
633 | ret = -ENOMEM; | |
634 | goto fail; | |
635 | } | |
636 | ||
637 | /* Request the entire hub descriptor. | |
638 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
639 | * but the hub can/will return fewer bytes here. | |
640 | */ | |
641 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
642 | sizeof(*hub->descriptor)); | |
643 | if (ret < 0) { | |
644 | message = "can't read hub descriptor"; | |
645 | goto fail; | |
646 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
647 | message = "hub has too many ports!"; | |
648 | ret = -ENODEV; | |
649 | goto fail; | |
650 | } | |
651 | ||
652 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
653 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
654 | (hdev->maxchild == 1) ? "" : "s"); | |
655 | ||
74ad9bd2 | 656 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 657 | |
74ad9bd2 | 658 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
659 | int i; |
660 | char portstr [USB_MAXCHILDREN + 1]; | |
661 | ||
662 | for (i = 0; i < hdev->maxchild; i++) | |
663 | portstr[i] = hub->descriptor->DeviceRemovable | |
664 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
665 | ? 'F' : 'R'; | |
666 | portstr[hdev->maxchild] = 0; | |
667 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
668 | } else | |
669 | dev_dbg(hub_dev, "standalone hub\n"); | |
670 | ||
74ad9bd2 | 671 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
672 | case 0x00: |
673 | dev_dbg(hub_dev, "ganged power switching\n"); | |
674 | break; | |
675 | case 0x01: | |
676 | dev_dbg(hub_dev, "individual port power switching\n"); | |
677 | break; | |
678 | case 0x02: | |
679 | case 0x03: | |
680 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
681 | break; | |
682 | } | |
683 | ||
74ad9bd2 | 684 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
685 | case 0x00: |
686 | dev_dbg(hub_dev, "global over-current protection\n"); | |
687 | break; | |
688 | case 0x08: | |
689 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
690 | break; | |
691 | case 0x10: | |
692 | case 0x18: | |
693 | dev_dbg(hub_dev, "no over-current protection\n"); | |
694 | break; | |
695 | } | |
696 | ||
697 | spin_lock_init (&hub->tt.lock); | |
698 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
c4028958 | 699 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent); |
1da177e4 LT |
700 | switch (hdev->descriptor.bDeviceProtocol) { |
701 | case 0: | |
702 | break; | |
703 | case 1: | |
704 | dev_dbg(hub_dev, "Single TT\n"); | |
705 | hub->tt.hub = hdev; | |
706 | break; | |
707 | case 2: | |
708 | ret = usb_set_interface(hdev, 0, 1); | |
709 | if (ret == 0) { | |
710 | dev_dbg(hub_dev, "TT per port\n"); | |
711 | hub->tt.multi = 1; | |
712 | } else | |
713 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
714 | ret); | |
715 | hub->tt.hub = hdev; | |
716 | break; | |
717 | default: | |
718 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
719 | hdev->descriptor.bDeviceProtocol); | |
720 | break; | |
721 | } | |
722 | ||
e09711ae | 723 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 724 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
725 | case HUB_TTTT_8_BITS: |
726 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
727 | hub->tt.think_time = 666; | |
728 | dev_dbg(hub_dev, "TT requires at most %d " | |
729 | "FS bit times (%d ns)\n", | |
730 | 8, hub->tt.think_time); | |
731 | } | |
1da177e4 | 732 | break; |
e09711ae DB |
733 | case HUB_TTTT_16_BITS: |
734 | hub->tt.think_time = 666 * 2; | |
735 | dev_dbg(hub_dev, "TT requires at most %d " | |
736 | "FS bit times (%d ns)\n", | |
737 | 16, hub->tt.think_time); | |
1da177e4 | 738 | break; |
e09711ae DB |
739 | case HUB_TTTT_24_BITS: |
740 | hub->tt.think_time = 666 * 3; | |
741 | dev_dbg(hub_dev, "TT requires at most %d " | |
742 | "FS bit times (%d ns)\n", | |
743 | 24, hub->tt.think_time); | |
1da177e4 | 744 | break; |
e09711ae DB |
745 | case HUB_TTTT_32_BITS: |
746 | hub->tt.think_time = 666 * 4; | |
747 | dev_dbg(hub_dev, "TT requires at most %d " | |
748 | "FS bit times (%d ns)\n", | |
749 | 32, hub->tt.think_time); | |
1da177e4 LT |
750 | break; |
751 | } | |
752 | ||
753 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 754 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
755 | hub->has_indicators = 1; |
756 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
757 | } | |
758 | ||
759 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
760 | hub->descriptor->bPwrOn2PwrGood * 2); | |
761 | ||
762 | /* power budgeting mostly matters with bus-powered hubs, | |
763 | * and battery-powered root hubs (may provide just 8 mA). | |
764 | */ | |
765 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 766 | if (ret < 2) { |
1da177e4 LT |
767 | message = "can't get hub status"; |
768 | goto fail; | |
769 | } | |
7d35b929 AS |
770 | le16_to_cpus(&hubstatus); |
771 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
772 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
773 | hub->mA_per_port = 500; | |
774 | else { | |
775 | hub->mA_per_port = hdev->bus_mA; | |
776 | hub->limited_power = 1; | |
777 | } | |
7d35b929 | 778 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
779 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
780 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
781 | hub->limited_power = 1; |
782 | if (hdev->maxchild > 0) { | |
783 | int remaining = hdev->bus_mA - | |
784 | hub->descriptor->bHubContrCurrent; | |
785 | ||
786 | if (remaining < hdev->maxchild * 100) | |
787 | dev_warn(hub_dev, | |
788 | "insufficient power available " | |
789 | "to use all downstream ports\n"); | |
790 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
791 | } | |
792 | } else { /* Self-powered external hub */ | |
793 | /* FIXME: What about battery-powered external hubs that | |
794 | * provide less current per port? */ | |
795 | hub->mA_per_port = 500; | |
7d35b929 | 796 | } |
55c52718 AS |
797 | if (hub->mA_per_port < 500) |
798 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
799 | hub->mA_per_port); | |
1da177e4 LT |
800 | |
801 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
802 | if (ret < 0) { | |
803 | message = "can't get hub status"; | |
804 | goto fail; | |
805 | } | |
806 | ||
807 | /* local power status reports aren't always correct */ | |
808 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
809 | dev_dbg(hub_dev, "local power source is %s\n", | |
810 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
811 | ? "lost (inactive)" : "good"); | |
812 | ||
74ad9bd2 | 813 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
814 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
815 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
816 | ||
88fafff9 | 817 | /* set up the interrupt endpoint |
818 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
819 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
820 | * to send more data (and thus cause overflow). For root hubs, | |
821 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
822 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
823 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
824 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
825 | ||
826 | if (maxp > sizeof(*hub->buffer)) | |
827 | maxp = sizeof(*hub->buffer); | |
828 | ||
829 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
830 | if (!hub->urb) { | |
831 | message = "couldn't allocate interrupt urb"; | |
832 | ret = -ENOMEM; | |
833 | goto fail; | |
834 | } | |
835 | ||
836 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
837 | hub, endpoint->bInterval); | |
838 | hub->urb->transfer_dma = hub->buffer_dma; | |
839 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
840 | ||
841 | /* maybe cycle the hub leds */ | |
842 | if (hub->has_indicators && blinkenlights) | |
843 | hub->indicator [0] = INDICATOR_CYCLE; | |
844 | ||
845 | hub_power_on(hub); | |
846 | hub_activate(hub); | |
847 | return 0; | |
848 | ||
849 | fail: | |
850 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
851 | message, ret); | |
852 | /* hub_disconnect() frees urb and descriptor */ | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static unsigned highspeed_hubs; | |
857 | ||
858 | static void hub_disconnect(struct usb_interface *intf) | |
859 | { | |
860 | struct usb_hub *hub = usb_get_intfdata (intf); | |
861 | struct usb_device *hdev; | |
862 | ||
7de18d8b AS |
863 | /* Disconnect all children and quiesce the hub */ |
864 | hub->error = 0; | |
865 | hub_pre_reset(intf); | |
866 | ||
8b28c752 | 867 | usb_set_intfdata (intf, NULL); |
1da177e4 LT |
868 | hdev = hub->hdev; |
869 | ||
870 | if (hdev->speed == USB_SPEED_HIGH) | |
871 | highspeed_hubs--; | |
872 | ||
1da177e4 LT |
873 | usb_free_urb(hub->urb); |
874 | hub->urb = NULL; | |
875 | ||
876 | spin_lock_irq(&hub_event_lock); | |
877 | list_del_init(&hub->event_list); | |
878 | spin_unlock_irq(&hub_event_lock); | |
879 | ||
1bc3c9e1 JJ |
880 | kfree(hub->descriptor); |
881 | hub->descriptor = NULL; | |
1da177e4 | 882 | |
1bc3c9e1 JJ |
883 | kfree(hub->status); |
884 | hub->status = NULL; | |
1da177e4 LT |
885 | |
886 | if (hub->buffer) { | |
887 | usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, | |
888 | hub->buffer_dma); | |
889 | hub->buffer = NULL; | |
890 | } | |
891 | ||
7d069b7d | 892 | kfree(hub); |
1da177e4 LT |
893 | } |
894 | ||
895 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
896 | { | |
897 | struct usb_host_interface *desc; | |
898 | struct usb_endpoint_descriptor *endpoint; | |
899 | struct usb_device *hdev; | |
900 | struct usb_hub *hub; | |
901 | ||
902 | desc = intf->cur_altsetting; | |
903 | hdev = interface_to_usbdev(intf); | |
904 | ||
89ccbdc9 DB |
905 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
906 | if (hdev->parent) { | |
907 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
908 | return -ENODEV; | |
909 | } | |
910 | #endif | |
911 | ||
1da177e4 LT |
912 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
913 | /* specs is not defined, but it works */ | |
914 | if ((desc->desc.bInterfaceSubClass != 0) && | |
915 | (desc->desc.bInterfaceSubClass != 1)) { | |
916 | descriptor_error: | |
917 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
918 | return -EIO; | |
919 | } | |
920 | ||
921 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
922 | if (desc->desc.bNumEndpoints != 1) | |
923 | goto descriptor_error; | |
924 | ||
925 | endpoint = &desc->endpoint[0].desc; | |
926 | ||
fbf81c29 LFC |
927 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
928 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
929 | goto descriptor_error; |
930 | ||
931 | /* We found a hub */ | |
932 | dev_info (&intf->dev, "USB hub found\n"); | |
933 | ||
0a1ef3b5 | 934 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
935 | if (!hub) { |
936 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
937 | return -ENOMEM; | |
938 | } | |
939 | ||
1da177e4 LT |
940 | INIT_LIST_HEAD(&hub->event_list); |
941 | hub->intfdev = &intf->dev; | |
942 | hub->hdev = hdev; | |
c4028958 | 943 | INIT_DELAYED_WORK(&hub->leds, led_work); |
1da177e4 LT |
944 | |
945 | usb_set_intfdata (intf, hub); | |
40f122f3 | 946 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
947 | |
948 | if (hdev->speed == USB_SPEED_HIGH) | |
949 | highspeed_hubs++; | |
950 | ||
951 | if (hub_configure(hub, endpoint) >= 0) | |
952 | return 0; | |
953 | ||
954 | hub_disconnect (intf); | |
955 | return -ENODEV; | |
956 | } | |
957 | ||
958 | static int | |
959 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
960 | { | |
961 | struct usb_device *hdev = interface_to_usbdev (intf); | |
962 | ||
963 | /* assert ifno == 0 (part of hub spec) */ | |
964 | switch (code) { | |
965 | case USBDEVFS_HUB_PORTINFO: { | |
966 | struct usbdevfs_hub_portinfo *info = user_data; | |
967 | int i; | |
968 | ||
969 | spin_lock_irq(&device_state_lock); | |
970 | if (hdev->devnum <= 0) | |
971 | info->nports = 0; | |
972 | else { | |
973 | info->nports = hdev->maxchild; | |
974 | for (i = 0; i < info->nports; i++) { | |
975 | if (hdev->children[i] == NULL) | |
976 | info->port[i] = 0; | |
977 | else | |
978 | info->port[i] = | |
979 | hdev->children[i]->devnum; | |
980 | } | |
981 | } | |
982 | spin_unlock_irq(&device_state_lock); | |
983 | ||
984 | return info->nports + 1; | |
985 | } | |
986 | ||
987 | default: | |
988 | return -ENOSYS; | |
989 | } | |
990 | } | |
991 | ||
1da177e4 LT |
992 | |
993 | /* grab device/port lock, returning index of that port (zero based). | |
994 | * protects the upstream link used by this device from concurrent | |
995 | * tree operations like suspend, resume, reset, and disconnect, which | |
996 | * apply to everything downstream of a given port. | |
997 | */ | |
998 | static int locktree(struct usb_device *udev) | |
999 | { | |
1000 | int t; | |
1001 | struct usb_device *hdev; | |
1002 | ||
1003 | if (!udev) | |
1004 | return -ENODEV; | |
1005 | ||
1006 | /* root hub is always the first lock in the series */ | |
1007 | hdev = udev->parent; | |
1008 | if (!hdev) { | |
1009 | usb_lock_device(udev); | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /* on the path from root to us, lock everything from | |
1014 | * top down, dropping parent locks when not needed | |
1015 | */ | |
1016 | t = locktree(hdev); | |
1017 | if (t < 0) | |
1018 | return t; | |
1da177e4 | 1019 | |
12c3da34 AS |
1020 | /* everything is fail-fast once disconnect |
1021 | * processing starts | |
1022 | */ | |
1023 | if (udev->state == USB_STATE_NOTATTACHED) { | |
1024 | usb_unlock_device(hdev); | |
1025 | return -ENODEV; | |
1da177e4 | 1026 | } |
12c3da34 AS |
1027 | |
1028 | /* when everyone grabs locks top->bottom, | |
1029 | * non-overlapping work may be concurrent | |
1030 | */ | |
1031 | usb_lock_device(udev); | |
1da177e4 | 1032 | usb_unlock_device(hdev); |
12c3da34 | 1033 | return udev->portnum; |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) | |
1037 | { | |
1038 | int i; | |
1039 | ||
1040 | for (i = 0; i < udev->maxchild; ++i) { | |
1041 | if (udev->children[i]) | |
1042 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1043 | } | |
ee49fb5d AS |
1044 | if (udev->state == USB_STATE_SUSPENDED) |
1045 | udev->discon_suspended = 1; | |
1da177e4 LT |
1046 | udev->state = USB_STATE_NOTATTACHED; |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1051 | * @udev: pointer to device whose state should be changed | |
1052 | * @new_state: new state value to be stored | |
1053 | * | |
1054 | * udev->state is _not_ fully protected by the device lock. Although | |
1055 | * most transitions are made only while holding the lock, the state can | |
1056 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1057 | * is so that devices can be marked as disconnected as soon as possible, | |
1058 | * without having to wait for any semaphores to be released. As a result, | |
1059 | * all changes to any device's state must be protected by the | |
1060 | * device_state_lock spinlock. | |
1061 | * | |
1062 | * Once a device has been added to the device tree, all changes to its state | |
1063 | * should be made using this routine. The state should _not_ be set directly. | |
1064 | * | |
1065 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1066 | * Otherwise udev->state is set to new_state, and if new_state is | |
1067 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1068 | * to USB_STATE_NOTATTACHED. | |
1069 | */ | |
1070 | void usb_set_device_state(struct usb_device *udev, | |
1071 | enum usb_device_state new_state) | |
1072 | { | |
1073 | unsigned long flags; | |
1074 | ||
1075 | spin_lock_irqsave(&device_state_lock, flags); | |
1076 | if (udev->state == USB_STATE_NOTATTACHED) | |
1077 | ; /* do nothing */ | |
b94dc6b5 | 1078 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1079 | |
1080 | /* root hub wakeup capabilities are managed out-of-band | |
1081 | * and may involve silicon errata ... ignore them here. | |
1082 | */ | |
1083 | if (udev->parent) { | |
645daaab AS |
1084 | if (udev->state == USB_STATE_SUSPENDED |
1085 | || new_state == USB_STATE_SUSPENDED) | |
1086 | ; /* No change to wakeup settings */ | |
1087 | else if (new_state == USB_STATE_CONFIGURED) | |
fb669cc0 DB |
1088 | device_init_wakeup(&udev->dev, |
1089 | (udev->actconfig->desc.bmAttributes | |
1090 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1091 | else |
fb669cc0 DB |
1092 | device_init_wakeup(&udev->dev, 0); |
1093 | } | |
645daaab | 1094 | udev->state = new_state; |
b94dc6b5 | 1095 | } else |
1da177e4 LT |
1096 | recursively_mark_NOTATTACHED(udev); |
1097 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1098 | } | |
1da177e4 LT |
1099 | |
1100 | ||
d388dab7 | 1101 | #ifdef CONFIG_PM |
1c50c317 AS |
1102 | |
1103 | /** | |
1104 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
1105 | * @rhdev: struct usb_device for the root hub | |
1106 | * | |
1107 | * The USB host controller driver calls this function when its root hub | |
1108 | * is resumed and Vbus power has been interrupted or the controller | |
1109 | * has been reset. The routine marks all the children of the root hub | |
1110 | * as NOTATTACHED and marks logical connect-change events on their ports. | |
1111 | */ | |
1112 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
1113 | { | |
1114 | struct usb_hub *hub; | |
1115 | int port1; | |
1116 | unsigned long flags; | |
1117 | ||
1118 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
353a4098 AS |
1119 | |
1120 | /* Make sure no potential wakeup events get lost, | |
1121 | * by forcing the root hub to be resumed. | |
1122 | */ | |
1123 | rhdev->dev.power.prev_state.event = PM_EVENT_ON; | |
1124 | ||
1c50c317 AS |
1125 | spin_lock_irqsave(&device_state_lock, flags); |
1126 | hub = hdev_to_hub(rhdev); | |
1127 | for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { | |
1128 | if (rhdev->children[port1 - 1]) { | |
1129 | recursively_mark_NOTATTACHED( | |
1130 | rhdev->children[port1 - 1]); | |
1131 | set_bit(port1, hub->change_bits); | |
1132 | } | |
1133 | } | |
1134 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
1137 | ||
d388dab7 | 1138 | #endif /* CONFIG_PM */ |
1c50c317 | 1139 | |
1da177e4 LT |
1140 | static void choose_address(struct usb_device *udev) |
1141 | { | |
1142 | int devnum; | |
1143 | struct usb_bus *bus = udev->bus; | |
1144 | ||
1145 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
1146 | ||
1147 | /* Try to allocate the next devnum beginning at bus->devnum_next. */ | |
1148 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1149 | bus->devnum_next); | |
1150 | if (devnum >= 128) | |
1151 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); | |
1152 | ||
1153 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1154 | ||
1155 | if (devnum < 128) { | |
1156 | set_bit(devnum, bus->devmap.devicemap); | |
1157 | udev->devnum = devnum; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | static void release_address(struct usb_device *udev) | |
1162 | { | |
1163 | if (udev->devnum > 0) { | |
1164 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1165 | udev->devnum = -1; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1171 | * @pdev: pointer to device being disconnected | |
1172 | * Context: !in_interrupt () | |
1173 | * | |
1174 | * Something got disconnected. Get rid of it and all of its children. | |
1175 | * | |
1176 | * If *pdev is a normal device then the parent hub must already be locked. | |
1177 | * If *pdev is a root hub then this routine will acquire the | |
1178 | * usb_bus_list_lock on behalf of the caller. | |
1179 | * | |
1180 | * Only hub drivers (including virtual root hub drivers for host | |
1181 | * controllers) should ever call this. | |
1182 | * | |
1183 | * This call is synchronous, and may not be used in an interrupt context. | |
1184 | */ | |
1185 | void usb_disconnect(struct usb_device **pdev) | |
1186 | { | |
1187 | struct usb_device *udev = *pdev; | |
1188 | int i; | |
1189 | ||
1190 | if (!udev) { | |
1191 | pr_debug ("%s nodev\n", __FUNCTION__); | |
1192 | return; | |
1193 | } | |
1194 | ||
1195 | /* mark the device as inactive, so any further urb submissions for | |
1196 | * this device (and any of its children) will fail immediately. | |
1197 | * this quiesces everyting except pending urbs. | |
1198 | */ | |
1199 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1200 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1201 | ||
9ad3d6cc AS |
1202 | usb_lock_device(udev); |
1203 | ||
1da177e4 LT |
1204 | /* Free up all the children before we remove this device */ |
1205 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1206 | if (udev->children[i]) | |
1207 | usb_disconnect(&udev->children[i]); | |
1208 | } | |
1209 | ||
1210 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1211 | * cleaning up all state associated with the current configuration | |
1212 | * so that the hardware is now fully quiesced. | |
1213 | */ | |
782da727 | 1214 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 LT |
1215 | usb_disable_device(udev, 0); |
1216 | ||
782da727 AS |
1217 | usb_unlock_device(udev); |
1218 | ||
1219 | /* Unregister the device. The device driver is responsible | |
1220 | * for removing the device files from usbfs and sysfs and for | |
1221 | * de-configuring the device. | |
1222 | */ | |
1223 | device_del(&udev->dev); | |
3099e75a | 1224 | |
782da727 | 1225 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1226 | * (or root_hub) pointer. |
1227 | */ | |
1da177e4 | 1228 | release_address(udev); |
1da177e4 LT |
1229 | |
1230 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1231 | spin_lock_irq(&device_state_lock); | |
1232 | *pdev = NULL; | |
1233 | spin_unlock_irq(&device_state_lock); | |
1234 | ||
ee49fb5d AS |
1235 | /* Decrement the parent's count of unsuspended children */ |
1236 | if (udev->parent) { | |
1237 | usb_pm_lock(udev); | |
1238 | if (!udev->discon_suspended) | |
94fcda1f | 1239 | usb_autosuspend_device(udev->parent); |
ee49fb5d AS |
1240 | usb_pm_unlock(udev); |
1241 | } | |
1242 | ||
782da727 | 1243 | put_device(&udev->dev); |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | #ifdef DEBUG | |
1247 | static void show_string(struct usb_device *udev, char *id, char *string) | |
1248 | { | |
1249 | if (!string) | |
1250 | return; | |
1251 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1252 | } | |
1253 | ||
1254 | #else | |
1255 | static inline void show_string(struct usb_device *udev, char *id, char *string) | |
1256 | {} | |
1257 | #endif | |
1258 | ||
1da177e4 LT |
1259 | |
1260 | #ifdef CONFIG_USB_OTG | |
1261 | #include "otg_whitelist.h" | |
11bd44ab | 1262 | static int __usb_port_suspend(struct usb_device *, int port1); |
1da177e4 LT |
1263 | #endif |
1264 | ||
c066475e | 1265 | static int __usb_new_device(void *void_data) |
1da177e4 | 1266 | { |
c066475e | 1267 | struct usb_device *udev = void_data; |
1da177e4 | 1268 | int err; |
1da177e4 | 1269 | |
c066475e GKH |
1270 | /* Lock ourself into memory in order to keep a probe sequence |
1271 | * sleeping in a new thread from allowing us to be unloaded. | |
1272 | */ | |
1273 | if (!try_module_get(THIS_MODULE)) | |
1274 | return -EINVAL; | |
1275 | ||
1da177e4 LT |
1276 | err = usb_get_configuration(udev); |
1277 | if (err < 0) { | |
1278 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1279 | err); | |
1280 | goto fail; | |
1281 | } | |
1282 | ||
1283 | /* read the standard strings and cache them if present */ | |
4f62efe6 AS |
1284 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
1285 | udev->manufacturer = usb_cache_string(udev, | |
1286 | udev->descriptor.iManufacturer); | |
1287 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1da177e4 LT |
1288 | |
1289 | /* Tell the world! */ | |
1290 | dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " | |
1291 | "SerialNumber=%d\n", | |
1292 | udev->descriptor.iManufacturer, | |
1293 | udev->descriptor.iProduct, | |
1294 | udev->descriptor.iSerialNumber); | |
1295 | show_string(udev, "Product", udev->product); | |
1296 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1297 | show_string(udev, "SerialNumber", udev->serial); | |
1298 | ||
1299 | #ifdef CONFIG_USB_OTG | |
1300 | /* | |
1301 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1302 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1303 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1304 | */ | |
1305 | if (!udev->bus->is_b_host | |
1306 | && udev->config | |
1307 | && udev->parent == udev->bus->root_hub) { | |
1308 | struct usb_otg_descriptor *desc = 0; | |
1309 | struct usb_bus *bus = udev->bus; | |
1310 | ||
1311 | /* descriptor may appear anywhere in config */ | |
1312 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1313 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1314 | USB_DT_OTG, (void **) &desc) == 0) { | |
1315 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1316 | unsigned port1 = udev->portnum; |
fc849b85 | 1317 | |
1da177e4 LT |
1318 | dev_info(&udev->dev, |
1319 | "Dual-Role OTG device on %sHNP port\n", | |
1320 | (port1 == bus->otg_port) | |
1321 | ? "" : "non-"); | |
1322 | ||
1323 | /* enable HNP before suspend, it's simpler */ | |
1324 | if (port1 == bus->otg_port) | |
1325 | bus->b_hnp_enable = 1; | |
1326 | err = usb_control_msg(udev, | |
1327 | usb_sndctrlpipe(udev, 0), | |
1328 | USB_REQ_SET_FEATURE, 0, | |
1329 | bus->b_hnp_enable | |
1330 | ? USB_DEVICE_B_HNP_ENABLE | |
1331 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1332 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1333 | if (err < 0) { | |
1334 | /* OTG MESSAGE: report errors here, | |
1335 | * customize to match your product. | |
1336 | */ | |
1337 | dev_info(&udev->dev, | |
1338 | "can't set HNP mode; %d\n", | |
1339 | err); | |
1340 | bus->b_hnp_enable = 0; | |
1341 | } | |
1342 | } | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | if (!is_targeted(udev)) { | |
1347 | ||
1348 | /* Maybe it can talk to us, though we can't talk to it. | |
1349 | * (Includes HNP test device.) | |
1350 | */ | |
1351 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
140d8f68 | 1352 | err = __usb_port_suspend(udev, udev->bus->otg_port); |
1da177e4 LT |
1353 | if (err < 0) |
1354 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1355 | } | |
1356 | err = -ENODEV; | |
1357 | goto fail; | |
1358 | } | |
1359 | #endif | |
1360 | ||
782da727 AS |
1361 | /* Register the device. The device driver is responsible |
1362 | * for adding the device files to usbfs and sysfs and for | |
1363 | * configuring the device. | |
1364 | */ | |
1da177e4 LT |
1365 | err = device_add (&udev->dev); |
1366 | if (err) { | |
1367 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1368 | goto fail; | |
1369 | } | |
9ad3d6cc | 1370 | |
ee49fb5d AS |
1371 | /* Increment the parent's count of unsuspended children */ |
1372 | if (udev->parent) | |
94fcda1f | 1373 | usb_autoresume_device(udev->parent); |
ee49fb5d | 1374 | |
c066475e GKH |
1375 | exit: |
1376 | module_put(THIS_MODULE); | |
1377 | return err; | |
1da177e4 LT |
1378 | |
1379 | fail: | |
1380 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
c066475e | 1381 | goto exit; |
1da177e4 LT |
1382 | } |
1383 | ||
c066475e GKH |
1384 | /** |
1385 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1386 | * @udev: newly addressed device (in ADDRESS state) | |
1387 | * | |
1388 | * This is called with devices which have been enumerated, but not yet | |
1389 | * configured. The device descriptor is available, but not descriptors | |
1390 | * for any device configuration. The caller must have locked either | |
1391 | * the parent hub (if udev is a normal device) or else the | |
1392 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1393 | * udev has already been installed, but udev is not yet visible through | |
1394 | * sysfs or other filesystem code. | |
1395 | * | |
1396 | * The return value for this function depends on if the | |
1397 | * multithread_probe variable is set or not. If it's set, it will | |
1398 | * return a if the probe thread was successfully created or not. If the | |
1399 | * variable is not set, it will return if the device is configured | |
1400 | * properly or not. interfaces, in sysfs); else a negative errno value. | |
1401 | * | |
1402 | * This call is synchronous, and may not be used in an interrupt context. | |
1403 | * | |
1404 | * Only the hub driver or root-hub registrar should ever call this. | |
1405 | */ | |
1406 | int usb_new_device(struct usb_device *udev) | |
1407 | { | |
1408 | struct task_struct *probe_task; | |
1409 | int ret = 0; | |
1410 | ||
1411 | if (multithread_probe) { | |
1412 | probe_task = kthread_run(__usb_new_device, udev, | |
1413 | "usb-probe-%s", udev->devnum); | |
1414 | if (IS_ERR(probe_task)) | |
1415 | ret = PTR_ERR(probe_task); | |
1416 | } else | |
1417 | ret = __usb_new_device(udev); | |
1418 | ||
1419 | return ret; | |
1420 | } | |
1da177e4 LT |
1421 | |
1422 | static int hub_port_status(struct usb_hub *hub, int port1, | |
1423 | u16 *status, u16 *change) | |
1424 | { | |
1425 | int ret; | |
1426 | ||
1427 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
d25450c6 | 1428 | if (ret < 4) { |
1da177e4 LT |
1429 | dev_err (hub->intfdev, |
1430 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
d25450c6 AS |
1431 | if (ret >= 0) |
1432 | ret = -EIO; | |
1433 | } else { | |
1da177e4 LT |
1434 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
1435 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
1436 | ret = 0; | |
1437 | } | |
1438 | return ret; | |
1439 | } | |
1440 | ||
0165de09 IPG |
1441 | |
1442 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ | |
1443 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1444 | { | |
1445 | struct usb_hcd *hcd; | |
1446 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1447 | return 0; | |
1448 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1449 | return hcd->wireless; | |
1450 | } | |
1451 | ||
1452 | ||
1da177e4 LT |
1453 | #define PORT_RESET_TRIES 5 |
1454 | #define SET_ADDRESS_TRIES 2 | |
1455 | #define GET_DESCRIPTOR_TRIES 2 | |
1456 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1457 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1458 | ||
1459 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1460 | #define HUB_SHORT_RESET_TIME 10 | |
1461 | #define HUB_LONG_RESET_TIME 200 | |
1462 | #define HUB_RESET_TIMEOUT 500 | |
1463 | ||
1464 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1465 | struct usb_device *udev, unsigned int delay) | |
1466 | { | |
1467 | int delay_time, ret; | |
1468 | u16 portstatus; | |
1469 | u16 portchange; | |
1470 | ||
1471 | for (delay_time = 0; | |
1472 | delay_time < HUB_RESET_TIMEOUT; | |
1473 | delay_time += delay) { | |
1474 | /* wait to give the device a chance to reset */ | |
1475 | msleep(delay); | |
1476 | ||
1477 | /* read and decode port status */ | |
1478 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1479 | if (ret < 0) | |
1480 | return ret; | |
1481 | ||
1482 | /* Device went away? */ | |
1483 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1484 | return -ENOTCONN; | |
1485 | ||
1486 | /* bomb out completely if something weird happened */ | |
1487 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) | |
1488 | return -EINVAL; | |
1489 | ||
1490 | /* if we`ve finished resetting, then break out of the loop */ | |
1491 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1492 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 IPG |
1493 | if (hub_is_wusb(hub)) |
1494 | udev->speed = USB_SPEED_VARIABLE; | |
1495 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1da177e4 LT |
1496 | udev->speed = USB_SPEED_HIGH; |
1497 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1498 | udev->speed = USB_SPEED_LOW; | |
1499 | else | |
1500 | udev->speed = USB_SPEED_FULL; | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | /* switch to the long delay after two short delay failures */ | |
1505 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1506 | delay = HUB_LONG_RESET_TIME; | |
1507 | ||
1508 | dev_dbg (hub->intfdev, | |
1509 | "port %d not reset yet, waiting %dms\n", | |
1510 | port1, delay); | |
1511 | } | |
1512 | ||
1513 | return -EBUSY; | |
1514 | } | |
1515 | ||
1516 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1517 | struct usb_device *udev, unsigned int delay) | |
1518 | { | |
1519 | int i, status; | |
1520 | ||
1521 | /* Reset the port */ | |
1522 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1523 | status = set_port_feature(hub->hdev, | |
1524 | port1, USB_PORT_FEAT_RESET); | |
1525 | if (status) | |
1526 | dev_err(hub->intfdev, | |
1527 | "cannot reset port %d (err = %d)\n", | |
1528 | port1, status); | |
1529 | else { | |
1530 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1531 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1532 | dev_dbg(hub->intfdev, |
1533 | "port_wait_reset: err = %d\n", | |
1534 | status); | |
1535 | } | |
1536 | ||
1537 | /* return on disconnect or reset */ | |
1538 | switch (status) { | |
1539 | case 0: | |
b789696a DB |
1540 | /* TRSTRCY = 10 ms; plus some extra */ |
1541 | msleep(10 + 40); | |
1da177e4 LT |
1542 | /* FALL THROUGH */ |
1543 | case -ENOTCONN: | |
1544 | case -ENODEV: | |
1545 | clear_port_feature(hub->hdev, | |
1546 | port1, USB_PORT_FEAT_C_RESET); | |
1547 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1548 | usb_set_device_state(udev, status | |
1549 | ? USB_STATE_NOTATTACHED | |
1550 | : USB_STATE_DEFAULT); | |
1551 | return status; | |
1552 | } | |
1553 | ||
1554 | dev_dbg (hub->intfdev, | |
1555 | "port %d not enabled, trying reset again...\n", | |
1556 | port1); | |
1557 | delay = HUB_LONG_RESET_TIME; | |
1558 | } | |
1559 | ||
1560 | dev_err (hub->intfdev, | |
1561 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
1562 | port1); | |
1563 | ||
1564 | return status; | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | /* |
1568 | * Disable a port and mark a logical connnect-change event, so that some | |
1569 | * time later khubd will disconnect() any existing usb_device on the port | |
1570 | * and will re-enumerate if there actually is a device attached. | |
1571 | */ | |
1572 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
1573 | { | |
1574 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
1575 | hub_port_disable(hub, port1, 1); | |
1576 | ||
1577 | /* FIXME let caller ask to power down the port: | |
1578 | * - some devices won't enumerate without a VBUS power cycle | |
1579 | * - SRP saves power that way | |
390a8c34 | 1580 | * - ... new call, TBD ... |
1da177e4 LT |
1581 | * That's easy if this hub can switch power per-port, and |
1582 | * khubd reactivates the port later (timer, SRP, etc). | |
1583 | * Powerdown must be optional, because of reset/DFU. | |
1584 | */ | |
1585 | ||
1586 | set_bit(port1, hub->change_bits); | |
1587 | kick_khubd(hub); | |
1588 | } | |
1589 | ||
d388dab7 | 1590 | #ifdef CONFIG_PM |
1da177e4 LT |
1591 | |
1592 | #ifdef CONFIG_USB_SUSPEND | |
1593 | ||
1594 | /* | |
1595 | * Selective port suspend reduces power; most suspended devices draw | |
1596 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
1597 | * All devices below the suspended port are also suspended. | |
1598 | * | |
1599 | * Devices leave suspend state when the host wakes them up. Some devices | |
1600 | * also support "remote wakeup", where the device can activate the USB | |
1601 | * tree above them to deliver data, such as a keypress or packet. In | |
1602 | * some cases, this wakes the USB host. | |
1603 | */ | |
1604 | static int hub_port_suspend(struct usb_hub *hub, int port1, | |
1605 | struct usb_device *udev) | |
1606 | { | |
1607 | int status; | |
1608 | ||
1609 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
1610 | ||
1611 | /* enable remote wakeup when appropriate; this lets the device | |
1612 | * wake up the upstream hub (including maybe the root hub). | |
1613 | * | |
1614 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
1615 | * we don't explicitly enable it here. | |
1616 | */ | |
645daaab | 1617 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
1618 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
1619 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
1620 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1621 | NULL, 0, | |
1622 | USB_CTRL_SET_TIMEOUT); | |
1623 | if (status) | |
1624 | dev_dbg(&udev->dev, | |
1625 | "won't remote wakeup, status %d\n", | |
1626 | status); | |
1627 | } | |
1628 | ||
1629 | /* see 7.1.7.6 */ | |
1630 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
1631 | if (status) { | |
1632 | dev_dbg(hub->intfdev, | |
1633 | "can't suspend port %d, status %d\n", | |
1634 | port1, status); | |
1635 | /* paranoia: "should not happen" */ | |
1636 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1637 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
1638 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1639 | NULL, 0, | |
1640 | USB_CTRL_SET_TIMEOUT); | |
1641 | } else { | |
1642 | /* device has up to 10 msec to fully suspend */ | |
645daaab AS |
1643 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
1644 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
1645 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1646 | msleep(10); | |
1647 | } | |
1648 | return status; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
ba9d35fb | 1653 | * to ACPI D2, "may cause the device to lose some context". |
1da177e4 LT |
1654 | * State transitions include: |
1655 | * | |
1656 | * - suspend, resume ... when the VBUS power link stays live | |
1657 | * - suspend, disconnect ... VBUS lost | |
1658 | * | |
1659 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
1660 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
1661 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
1662 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
1663 | * timer, no SRP, no requests through sysfs. | |
390a8c34 DB |
1664 | * |
1665 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
1666 | * the root hub for their bus goes into global suspend ... so we don't | |
1667 | * (falsely) update the device power state to say it suspended. | |
1da177e4 | 1668 | */ |
140d8f68 | 1669 | static int __usb_port_suspend (struct usb_device *udev, int port1) |
1da177e4 | 1670 | { |
f3f3253d | 1671 | int status = 0; |
1da177e4 LT |
1672 | |
1673 | /* caller owns the udev device lock */ | |
1674 | if (port1 < 0) | |
1675 | return port1; | |
1676 | ||
140d8f68 AS |
1677 | /* we change the device's upstream USB link, |
1678 | * but root hubs have no upstream USB link. | |
1da177e4 | 1679 | */ |
f3f3253d | 1680 | if (udev->parent) |
1da177e4 LT |
1681 | status = hub_port_suspend(hdev_to_hub(udev->parent), port1, |
1682 | udev); | |
2bf4086d | 1683 | else { |
645daaab AS |
1684 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
1685 | udev->auto_pm ? "auto-" : ""); | |
2bf4086d AS |
1686 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1687 | } | |
1da177e4 LT |
1688 | return status; |
1689 | } | |
1690 | ||
5edbfb7c | 1691 | /* |
140d8f68 | 1692 | * usb_port_suspend - suspend a usb device's upstream port |
1da177e4 | 1693 | * @udev: device that's no longer in active use |
5edbfb7c | 1694 | * Context: must be able to sleep; device not locked; pm locks held |
1da177e4 LT |
1695 | * |
1696 | * Suspends a USB device that isn't in active use, conserving power. | |
1697 | * Devices may wake out of a suspend, if anything important happens, | |
1698 | * using the remote wakeup mechanism. They may also be taken out of | |
140d8f68 | 1699 | * suspend by the host, using usb_port_resume(). It's also routine |
1da177e4 LT |
1700 | * to disconnect devices while they are suspended. |
1701 | * | |
390a8c34 DB |
1702 | * This only affects the USB hardware for a device; its interfaces |
1703 | * (and, for hubs, child devices) must already have been suspended. | |
1704 | * | |
1da177e4 LT |
1705 | * Suspending OTG devices may trigger HNP, if that's been enabled |
1706 | * between a pair of dual-role devices. That will change roles, such | |
1707 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
1708 | * | |
1709 | * Returns 0 on success, else negative errno. | |
1710 | */ | |
140d8f68 | 1711 | int usb_port_suspend(struct usb_device *udev) |
1da177e4 | 1712 | { |
140d8f68 | 1713 | return __usb_port_suspend(udev, udev->portnum); |
1da177e4 | 1714 | } |
f3f3253d | 1715 | |
1da177e4 | 1716 | /* |
390a8c34 DB |
1717 | * If the USB "suspend" state is in use (rather than "global suspend"), |
1718 | * many devices will be individually taken out of suspend state using | |
1719 | * special" resume" signaling. These routines kick in shortly after | |
1da177e4 LT |
1720 | * hardware resume signaling is finished, either because of selective |
1721 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
1722 | * in the tree that's rooted at this device. | |
1723 | */ | |
140d8f68 | 1724 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 LT |
1725 | { |
1726 | int status; | |
1727 | u16 devstatus; | |
1728 | ||
1729 | /* caller owns the udev device lock */ | |
f3f3253d | 1730 | dev_dbg(&udev->dev, "finish resume\n"); |
1da177e4 LT |
1731 | |
1732 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
1733 | * state the device resumes to. Linux currently won't see the | |
1734 | * first two on the host side; they'd be inside hub_port_init() | |
1735 | * during many timeouts, but khubd can't suspend until later. | |
1736 | */ | |
1737 | usb_set_device_state(udev, udev->actconfig | |
1738 | ? USB_STATE_CONFIGURED | |
1739 | : USB_STATE_ADDRESS); | |
1da177e4 LT |
1740 | |
1741 | /* 10.5.4.5 says be sure devices in the tree are still there. | |
1742 | * For now let's assume the device didn't go crazy on resume, | |
1743 | * and device drivers will know about any resume quirks. | |
1744 | */ | |
1745 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); | |
b40b7a90 AS |
1746 | if (status >= 0) |
1747 | status = (status == 2 ? 0 : -ENODEV); | |
1748 | ||
1749 | if (status) | |
1da177e4 LT |
1750 | dev_dbg(&udev->dev, |
1751 | "gone after usb resume? status %d\n", | |
1752 | status); | |
1753 | else if (udev->actconfig) { | |
1da177e4 | 1754 | le16_to_cpus(&devstatus); |
55c52718 | 1755 | if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
f3f3253d | 1756 | && udev->parent) { |
1da177e4 LT |
1757 | status = usb_control_msg(udev, |
1758 | usb_sndctrlpipe(udev, 0), | |
1759 | USB_REQ_CLEAR_FEATURE, | |
1760 | USB_RECIP_DEVICE, | |
1761 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1762 | NULL, 0, | |
1763 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 1764 | if (status) |
1da177e4 LT |
1765 | dev_dbg(&udev->dev, "disable remote " |
1766 | "wakeup, status %d\n", status); | |
4bf0ba86 | 1767 | } |
1da177e4 LT |
1768 | status = 0; |
1769 | ||
1770 | } else if (udev->devnum <= 0) { | |
1771 | dev_dbg(&udev->dev, "bogus resume!\n"); | |
1772 | status = -EINVAL; | |
1773 | } | |
1774 | return status; | |
1775 | } | |
1776 | ||
1777 | static int | |
1778 | hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) | |
1779 | { | |
1780 | int status; | |
d25450c6 AS |
1781 | u16 portchange, portstatus; |
1782 | ||
1783 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
1784 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1785 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
1786 | goto SuspendCleared; | |
1da177e4 LT |
1787 | |
1788 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
1789 | ||
d5cbad4b AS |
1790 | set_bit(port1, hub->busy_bits); |
1791 | ||
1da177e4 LT |
1792 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
1793 | status = clear_port_feature(hub->hdev, | |
1794 | port1, USB_PORT_FEAT_SUSPEND); | |
1795 | if (status) { | |
1796 | dev_dbg(hub->intfdev, | |
1797 | "can't resume port %d, status %d\n", | |
1798 | port1, status); | |
1799 | } else { | |
1da177e4 LT |
1800 | /* drive resume for at least 20 msec */ |
1801 | if (udev) | |
645daaab AS |
1802 | dev_dbg(&udev->dev, "usb %sresume\n", |
1803 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
1804 | msleep(25); |
1805 | ||
1806 | #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ | |
1807 | | USB_PORT_STAT_ENABLE \ | |
1808 | | USB_PORT_STAT_CONNECTION) | |
1809 | ||
1810 | /* Virtual root hubs can trigger on GET_PORT_STATUS to | |
1811 | * stop resume signaling. Then finish the resume | |
1812 | * sequence. | |
1813 | */ | |
d25450c6 AS |
1814 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
1815 | SuspendCleared: | |
1da177e4 | 1816 | if (status < 0 |
d25450c6 AS |
1817 | || (portstatus & LIVE_FLAGS) != LIVE_FLAGS |
1818 | || (portstatus & USB_PORT_STAT_SUSPEND) != 0 | |
1da177e4 LT |
1819 | ) { |
1820 | dev_dbg(hub->intfdev, | |
1821 | "port %d status %04x.%04x after resume, %d\n", | |
d25450c6 | 1822 | port1, portchange, portstatus, status); |
20307949 AS |
1823 | if (status >= 0) |
1824 | status = -ENODEV; | |
1da177e4 | 1825 | } else { |
20307949 AS |
1826 | if (portchange & USB_PORT_STAT_C_SUSPEND) |
1827 | clear_port_feature(hub->hdev, port1, | |
1828 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 LT |
1829 | /* TRSMRCY = 10 msec */ |
1830 | msleep(10); | |
1831 | if (udev) | |
140d8f68 | 1832 | status = finish_port_resume(udev); |
1da177e4 LT |
1833 | } |
1834 | } | |
1835 | if (status < 0) | |
1836 | hub_port_logical_disconnect(hub, port1); | |
1837 | ||
d5cbad4b AS |
1838 | clear_bit(port1, hub->busy_bits); |
1839 | if (!hub->hdev->parent && !hub->busy_bits[0]) | |
1840 | usb_enable_root_hub_irq(hub->hdev->bus); | |
1841 | ||
1da177e4 LT |
1842 | return status; |
1843 | } | |
1844 | ||
5edbfb7c | 1845 | /* |
140d8f68 | 1846 | * usb_port_resume - re-activate a suspended usb device's upstream port |
1da177e4 | 1847 | * @udev: device to re-activate |
5edbfb7c | 1848 | * Context: must be able to sleep; device not locked; pm locks held |
1da177e4 LT |
1849 | * |
1850 | * This will re-activate the suspended device, increasing power usage | |
1851 | * while letting drivers communicate again with its endpoints. | |
1852 | * USB resume explicitly guarantees that the power session between | |
1853 | * the host and the device is the same as it was when the device | |
1854 | * suspended. | |
1855 | * | |
1856 | * Returns 0 on success, else negative errno. | |
1857 | */ | |
140d8f68 | 1858 | int usb_port_resume(struct usb_device *udev) |
1da177e4 | 1859 | { |
d388dab7 | 1860 | int status; |
1da177e4 | 1861 | |
140d8f68 AS |
1862 | /* we change the device's upstream USB link, |
1863 | * but root hubs have no upstream USB link. | |
1864 | */ | |
f3f3253d | 1865 | if (udev->parent) { |
114b368c AS |
1866 | // NOTE this fails if parent is also suspended... |
1867 | status = hub_port_resume(hdev_to_hub(udev->parent), | |
1868 | udev->portnum, udev); | |
645daaab AS |
1869 | } else { |
1870 | dev_dbg(&udev->dev, "usb %sresume\n", | |
1871 | udev->auto_pm ? "auto-" : ""); | |
140d8f68 | 1872 | status = finish_port_resume(udev); |
645daaab | 1873 | } |
f3f3253d | 1874 | if (status < 0) |
a8e7c565 | 1875 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
1da177e4 LT |
1876 | return status; |
1877 | } | |
1878 | ||
1879 | static int remote_wakeup(struct usb_device *udev) | |
1880 | { | |
1881 | int status = 0; | |
1882 | ||
9ad3d6cc | 1883 | usb_lock_device(udev); |
1da177e4 | 1884 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 1885 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
94fcda1f | 1886 | status = usb_autoresume_device(udev); |
d25450c6 AS |
1887 | |
1888 | /* Give the interface drivers a chance to do something, | |
1889 | * then autosuspend the device again. */ | |
645daaab | 1890 | if (status == 0) |
94fcda1f | 1891 | usb_autosuspend_device(udev); |
1da177e4 | 1892 | } |
9ad3d6cc | 1893 | usb_unlock_device(udev); |
1da177e4 LT |
1894 | return status; |
1895 | } | |
1896 | ||
d388dab7 AS |
1897 | #else /* CONFIG_USB_SUSPEND */ |
1898 | ||
1899 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
1900 | ||
1901 | int usb_port_suspend(struct usb_device *udev) | |
1902 | { | |
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | static inline int | |
1907 | finish_port_resume(struct usb_device *udev) | |
1908 | { | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | static inline int | |
1913 | hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) | |
1914 | { | |
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | int usb_port_resume(struct usb_device *udev) | |
1919 | { | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static inline int remote_wakeup(struct usb_device *udev) | |
1924 | { | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | #endif | |
1929 | ||
db690874 | 1930 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
1931 | { |
1932 | struct usb_hub *hub = usb_get_intfdata (intf); | |
1933 | struct usb_device *hdev = hub->hdev; | |
1934 | unsigned port1; | |
1da177e4 | 1935 | |
c9f89fa4 | 1936 | /* fail if children aren't already suspended */ |
1da177e4 LT |
1937 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
1938 | struct usb_device *udev; | |
1939 | ||
1940 | udev = hdev->children [port1-1]; | |
114b368c | 1941 | if (udev && msg.event == PM_EVENT_SUSPEND && |
f3f3253d | 1942 | #ifdef CONFIG_USB_SUSPEND |
114b368c AS |
1943 | udev->state != USB_STATE_SUSPENDED |
1944 | #else | |
1945 | udev->dev.power.power_state.event | |
1946 | == PM_EVENT_ON | |
f3f3253d | 1947 | #endif |
114b368c | 1948 | ) { |
645daaab AS |
1949 | if (!hdev->auto_pm) |
1950 | dev_dbg(&intf->dev, "port %d nyet suspended\n", | |
1951 | port1); | |
c9f89fa4 DB |
1952 | return -EBUSY; |
1953 | } | |
1da177e4 LT |
1954 | } |
1955 | ||
40f122f3 AS |
1956 | dev_dbg(&intf->dev, "%s\n", __FUNCTION__); |
1957 | ||
f3f3253d DB |
1958 | /* "global suspend" of the downstream HC-to-USB interface */ |
1959 | if (!hdev->parent) { | |
1960 | struct usb_bus *bus = hdev->bus; | |
0c0382e3 AS |
1961 | if (bus) { |
1962 | int status = hcd_bus_suspend (bus); | |
f3f3253d DB |
1963 | |
1964 | if (status != 0) { | |
1965 | dev_dbg(&hdev->dev, "'global' suspend %d\n", | |
1966 | status); | |
1967 | return status; | |
1968 | } | |
1969 | } else | |
1970 | return -EOPNOTSUPP; | |
1971 | } | |
1972 | ||
c9f89fa4 DB |
1973 | /* stop khubd and related activity */ |
1974 | hub_quiesce(hub); | |
1da177e4 LT |
1975 | return 0; |
1976 | } | |
1977 | ||
1978 | static int hub_resume(struct usb_interface *intf) | |
1979 | { | |
1da177e4 | 1980 | struct usb_hub *hub = usb_get_intfdata (intf); |
40f122f3 | 1981 | struct usb_device *hdev = hub->hdev; |
1da177e4 LT |
1982 | int status; |
1983 | ||
40f122f3 AS |
1984 | dev_dbg(&intf->dev, "%s\n", __FUNCTION__); |
1985 | ||
f3f3253d DB |
1986 | /* "global resume" of the downstream HC-to-USB interface */ |
1987 | if (!hdev->parent) { | |
1988 | struct usb_bus *bus = hdev->bus; | |
0c0382e3 AS |
1989 | if (bus) { |
1990 | status = hcd_bus_resume (bus); | |
f3f3253d DB |
1991 | if (status) { |
1992 | dev_dbg(&intf->dev, "'global' resume %d\n", | |
1993 | status); | |
1994 | return status; | |
1995 | } | |
1996 | } else | |
1997 | return -EOPNOTSUPP; | |
1998 | if (status == 0) { | |
1999 | /* TRSMRCY = 10 msec */ | |
2000 | msleep(10); | |
2001 | } | |
2002 | } | |
2003 | ||
a8e7c565 | 2004 | /* tell khubd to look for changes on this hub */ |
f3f3253d | 2005 | hub_activate(hub); |
1da177e4 LT |
2006 | return 0; |
2007 | } | |
2008 | ||
d388dab7 AS |
2009 | #else /* CONFIG_PM */ |
2010 | ||
2011 | static inline int remote_wakeup(struct usb_device *udev) | |
2012 | { | |
2013 | return 0; | |
2014 | } | |
2015 | ||
511366da AM |
2016 | #define hub_suspend NULL |
2017 | #define hub_resume NULL | |
d388dab7 AS |
2018 | #endif |
2019 | ||
1da177e4 LT |
2020 | void usb_resume_root_hub(struct usb_device *hdev) |
2021 | { | |
2022 | struct usb_hub *hub = hdev_to_hub(hdev); | |
2023 | ||
1da177e4 LT |
2024 | kick_khubd(hub); |
2025 | } | |
2026 | ||
1da177e4 LT |
2027 | |
2028 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2029 | * | |
2030 | * Between connect detection and reset signaling there must be a delay | |
2031 | * of 100ms at least for debounce and power-settling. The corresponding | |
2032 | * timer shall restart whenever the downstream port detects a disconnect. | |
2033 | * | |
2034 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2035 | * low-speed devices for which this debounce period may last over a second. | |
2036 | * Not covered by the spec - but easy to deal with. | |
2037 | * | |
2038 | * This implementation uses a 1500ms total debounce timeout; if the | |
2039 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2040 | * every 25ms for transient disconnects. When the port status has been | |
2041 | * unchanged for 100ms it returns the port status. | |
2042 | */ | |
2043 | ||
2044 | #define HUB_DEBOUNCE_TIMEOUT 1500 | |
2045 | #define HUB_DEBOUNCE_STEP 25 | |
2046 | #define HUB_DEBOUNCE_STABLE 100 | |
2047 | ||
2048 | static int hub_port_debounce(struct usb_hub *hub, int port1) | |
2049 | { | |
2050 | int ret; | |
2051 | int total_time, stable_time = 0; | |
2052 | u16 portchange, portstatus; | |
2053 | unsigned connection = 0xffff; | |
2054 | ||
2055 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2056 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2057 | if (ret < 0) | |
2058 | return ret; | |
2059 | ||
2060 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2061 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2062 | stable_time += HUB_DEBOUNCE_STEP; | |
2063 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2064 | break; | |
2065 | } else { | |
2066 | stable_time = 0; | |
2067 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2068 | } | |
2069 | ||
2070 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2071 | clear_port_feature(hub->hdev, port1, | |
2072 | USB_PORT_FEAT_C_CONNECTION); | |
2073 | } | |
2074 | ||
2075 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2076 | break; | |
2077 | msleep(HUB_DEBOUNCE_STEP); | |
2078 | } | |
2079 | ||
2080 | dev_dbg (hub->intfdev, | |
2081 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2082 | port1, total_time, stable_time, portstatus); | |
2083 | ||
2084 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2085 | return -ETIMEDOUT; | |
2086 | return portstatus; | |
2087 | } | |
2088 | ||
2089 | static void ep0_reinit(struct usb_device *udev) | |
2090 | { | |
2091 | usb_disable_endpoint(udev, 0 + USB_DIR_IN); | |
2092 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT); | |
2093 | udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; | |
2094 | } | |
2095 | ||
2096 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2097 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2098 | ||
2099 | static int hub_set_address(struct usb_device *udev) | |
2100 | { | |
2101 | int retval; | |
2102 | ||
2103 | if (udev->devnum == 0) | |
2104 | return -EINVAL; | |
2105 | if (udev->state == USB_STATE_ADDRESS) | |
2106 | return 0; | |
2107 | if (udev->state != USB_STATE_DEFAULT) | |
2108 | return -EINVAL; | |
2109 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
2110 | USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, | |
2111 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2112 | if (retval == 0) { | |
2113 | usb_set_device_state(udev, USB_STATE_ADDRESS); | |
2114 | ep0_reinit(udev); | |
2115 | } | |
2116 | return retval; | |
2117 | } | |
2118 | ||
2119 | /* Reset device, (re)assign address, get device descriptor. | |
2120 | * Device connection must be stable, no more debouncing needed. | |
2121 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2122 | * | |
2123 | * If this is called for an already-existing device (as part of | |
2124 | * usb_reset_device), the caller must own the device lock. For a | |
2125 | * newly detected device that is not accessible through any global | |
2126 | * pointers, it's not necessary to lock the device. | |
2127 | */ | |
2128 | static int | |
2129 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2130 | int retry_counter) | |
2131 | { | |
4186ecf8 | 2132 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2133 | |
2134 | struct usb_device *hdev = hub->hdev; | |
2135 | int i, j, retval; | |
2136 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2137 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2138 | char *speed, *type; |
1da177e4 LT |
2139 | |
2140 | /* root hub ports have a slightly longer reset period | |
2141 | * (from USB 2.0 spec, section 7.1.7.5) | |
2142 | */ | |
2143 | if (!hdev->parent) { | |
2144 | delay = HUB_ROOT_RESET_TIME; | |
2145 | if (port1 == hdev->bus->otg_port) | |
2146 | hdev->bus->b_hnp_enable = 0; | |
2147 | } | |
2148 | ||
2149 | /* Some low speed devices have problems with the quick delay, so */ | |
2150 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2151 | if (oldspeed == USB_SPEED_LOW) | |
2152 | delay = HUB_LONG_RESET_TIME; | |
2153 | ||
4186ecf8 | 2154 | mutex_lock(&usb_address0_mutex); |
1da177e4 LT |
2155 | |
2156 | /* Reset the device; full speed may morph to high speed */ | |
2157 | retval = hub_port_reset(hub, port1, udev, delay); | |
2158 | if (retval < 0) /* error or disconnect */ | |
2159 | goto fail; | |
2160 | /* success, speed is known */ | |
2161 | retval = -ENODEV; | |
2162 | ||
2163 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2164 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2165 | goto fail; | |
2166 | } | |
2167 | oldspeed = udev->speed; | |
2168 | ||
2169 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... | |
2170 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2171 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2172 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2173 | */ |
2174 | switch (udev->speed) { | |
5bb6e0ae IPG |
2175 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
2176 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); | |
2177 | break; | |
1da177e4 LT |
2178 | case USB_SPEED_HIGH: /* fixed at 64 */ |
2179 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2180 | break; | |
2181 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2182 | /* to determine the ep0 maxpacket size, try to read | |
2183 | * the device descriptor to get bMaxPacketSize0 and | |
2184 | * then correct our initial guess. | |
2185 | */ | |
2186 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2187 | break; | |
2188 | case USB_SPEED_LOW: /* fixed at 8 */ | |
2189 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); | |
2190 | break; | |
2191 | default: | |
2192 | goto fail; | |
2193 | } | |
2194 | ||
83a07196 IPG |
2195 | type = ""; |
2196 | switch (udev->speed) { | |
2197 | case USB_SPEED_LOW: speed = "low"; break; | |
2198 | case USB_SPEED_FULL: speed = "full"; break; | |
2199 | case USB_SPEED_HIGH: speed = "high"; break; | |
2200 | case USB_SPEED_VARIABLE: | |
2201 | speed = "variable"; | |
2202 | type = "Wireless "; | |
2203 | break; | |
2204 | default: speed = "?"; break; | |
2205 | } | |
1da177e4 | 2206 | dev_info (&udev->dev, |
83a07196 IPG |
2207 | "%s %s speed %sUSB device using %s and address %d\n", |
2208 | (udev->config) ? "reset" : "new", speed, type, | |
2209 | udev->bus->controller->driver->name, udev->devnum); | |
1da177e4 LT |
2210 | |
2211 | /* Set up TT records, if needed */ | |
2212 | if (hdev->tt) { | |
2213 | udev->tt = hdev->tt; | |
2214 | udev->ttport = hdev->ttport; | |
2215 | } else if (udev->speed != USB_SPEED_HIGH | |
2216 | && hdev->speed == USB_SPEED_HIGH) { | |
2217 | udev->tt = &hub->tt; | |
2218 | udev->ttport = port1; | |
2219 | } | |
2220 | ||
2221 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2222 | * Because device hardware and firmware is sometimes buggy in | |
2223 | * this area, and this is how Linux has done it for ages. | |
2224 | * Change it cautiously. | |
2225 | * | |
2226 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2227 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2228 | * so it may help with some non-standards-compliant devices. | |
2229 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2230 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2231 | * value. | |
2232 | */ | |
2233 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
2234 | if (USE_NEW_SCHEME(retry_counter)) { | |
2235 | struct usb_device_descriptor *buf; | |
2236 | int r = 0; | |
2237 | ||
2238 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2239 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2240 | if (!buf) { | |
2241 | retval = -ENOMEM; | |
2242 | continue; | |
2243 | } | |
2244 | ||
2245 | /* Use a short timeout the first time through, | |
2246 | * so that recalcitrant full-speed devices with | |
2247 | * 8- or 16-byte ep0-maxpackets won't slow things | |
2248 | * down tremendously by NAKing the unexpectedly | |
2249 | * early status stage. Also, retry on all errors; | |
2250 | * some devices are flakey. | |
5bb6e0ae IPG |
2251 | * 255 is for WUSB devices, we actually need to use 512. |
2252 | * WUSB1.0[4.8.1]. | |
1da177e4 LT |
2253 | */ |
2254 | for (j = 0; j < 3; ++j) { | |
2255 | buf->bMaxPacketSize0 = 0; | |
2256 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2257 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2258 | USB_DT_DEVICE << 8, 0, | |
2259 | buf, GET_DESCRIPTOR_BUFSIZE, | |
2260 | (i ? USB_CTRL_GET_TIMEOUT : 1000)); | |
2261 | switch (buf->bMaxPacketSize0) { | |
5bb6e0ae | 2262 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2263 | if (buf->bDescriptorType == |
2264 | USB_DT_DEVICE) { | |
2265 | r = 0; | |
2266 | break; | |
2267 | } | |
2268 | /* FALL THROUGH */ | |
2269 | default: | |
2270 | if (r == 0) | |
2271 | r = -EPROTO; | |
2272 | break; | |
2273 | } | |
2274 | if (r == 0) | |
2275 | break; | |
2276 | } | |
2277 | udev->descriptor.bMaxPacketSize0 = | |
2278 | buf->bMaxPacketSize0; | |
2279 | kfree(buf); | |
2280 | ||
2281 | retval = hub_port_reset(hub, port1, udev, delay); | |
2282 | if (retval < 0) /* error or disconnect */ | |
2283 | goto fail; | |
2284 | if (oldspeed != udev->speed) { | |
2285 | dev_dbg(&udev->dev, | |
2286 | "device reset changed speed!\n"); | |
2287 | retval = -ENODEV; | |
2288 | goto fail; | |
2289 | } | |
2290 | if (r) { | |
2291 | dev_err(&udev->dev, "device descriptor " | |
2292 | "read/%s, error %d\n", | |
2293 | "64", r); | |
2294 | retval = -EMSGSIZE; | |
2295 | continue; | |
2296 | } | |
2297 | #undef GET_DESCRIPTOR_BUFSIZE | |
2298 | } | |
2299 | ||
2300 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { | |
2301 | retval = hub_set_address(udev); | |
2302 | if (retval >= 0) | |
2303 | break; | |
2304 | msleep(200); | |
2305 | } | |
2306 | if (retval < 0) { | |
2307 | dev_err(&udev->dev, | |
2308 | "device not accepting address %d, error %d\n", | |
2309 | udev->devnum, retval); | |
2310 | goto fail; | |
2311 | } | |
2312 | ||
2313 | /* cope with hardware quirkiness: | |
2314 | * - let SET_ADDRESS settle, some device hardware wants it | |
2315 | * - read ep0 maxpacket even for high and low speed, | |
2316 | */ | |
2317 | msleep(10); | |
2318 | if (USE_NEW_SCHEME(retry_counter)) | |
2319 | break; | |
2320 | ||
2321 | retval = usb_get_device_descriptor(udev, 8); | |
2322 | if (retval < 8) { | |
2323 | dev_err(&udev->dev, "device descriptor " | |
2324 | "read/%s, error %d\n", | |
2325 | "8", retval); | |
2326 | if (retval >= 0) | |
2327 | retval = -EMSGSIZE; | |
2328 | } else { | |
2329 | retval = 0; | |
2330 | break; | |
2331 | } | |
2332 | } | |
2333 | if (retval) | |
2334 | goto fail; | |
2335 | ||
5bb6e0ae IPG |
2336 | i = udev->descriptor.bMaxPacketSize0 == 0xff? |
2337 | 512 : udev->descriptor.bMaxPacketSize0; | |
1da177e4 LT |
2338 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2339 | if (udev->speed != USB_SPEED_FULL || | |
2340 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2341 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2342 | retval = -EMSGSIZE; | |
2343 | goto fail; | |
2344 | } | |
2345 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2346 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
2347 | ep0_reinit(udev); | |
2348 | } | |
2349 | ||
2350 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2351 | if (retval < (signed)sizeof(udev->descriptor)) { | |
2352 | dev_err(&udev->dev, "device descriptor read/%s, error %d\n", | |
2353 | "all", retval); | |
2354 | if (retval >= 0) | |
2355 | retval = -ENOMSG; | |
2356 | goto fail; | |
2357 | } | |
2358 | ||
2359 | retval = 0; | |
2360 | ||
2361 | fail: | |
2362 | if (retval) | |
2363 | hub_port_disable(hub, port1, 0); | |
4186ecf8 | 2364 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2365 | return retval; |
2366 | } | |
2367 | ||
2368 | static void | |
2369 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2370 | { | |
2371 | struct usb_qualifier_descriptor *qual; | |
2372 | int status; | |
2373 | ||
2374 | qual = kmalloc (sizeof *qual, SLAB_KERNEL); | |
2375 | if (qual == NULL) | |
2376 | return; | |
2377 | ||
2378 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2379 | qual, sizeof *qual); | |
2380 | if (status == sizeof *qual) { | |
2381 | dev_info(&udev->dev, "not running at top speed; " | |
2382 | "connect to a high speed hub\n"); | |
2383 | /* hub LEDs are probably harder to miss than syslog */ | |
2384 | if (hub->has_indicators) { | |
2385 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2386 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2387 | } |
2388 | } | |
1bc3c9e1 | 2389 | kfree(qual); |
1da177e4 LT |
2390 | } |
2391 | ||
2392 | static unsigned | |
2393 | hub_power_remaining (struct usb_hub *hub) | |
2394 | { | |
2395 | struct usb_device *hdev = hub->hdev; | |
2396 | int remaining; | |
55c52718 | 2397 | int port1; |
1da177e4 | 2398 | |
55c52718 | 2399 | if (!hub->limited_power) |
1da177e4 LT |
2400 | return 0; |
2401 | ||
55c52718 AS |
2402 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2403 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2404 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2405 | int delta; | |
1da177e4 LT |
2406 | |
2407 | if (!udev) | |
2408 | continue; | |
2409 | ||
55c52718 AS |
2410 | /* Unconfigured devices may not use more than 100mA, |
2411 | * or 8mA for OTG ports */ | |
1da177e4 | 2412 | if (udev->actconfig) |
55c52718 AS |
2413 | delta = udev->actconfig->desc.bMaxPower * 2; |
2414 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2415 | delta = 100; | |
1da177e4 | 2416 | else |
55c52718 AS |
2417 | delta = 8; |
2418 | if (delta > hub->mA_per_port) | |
2419 | dev_warn(&udev->dev, "%dmA is over %umA budget " | |
2420 | "for port %d!\n", | |
2421 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2422 | remaining -= delta; |
2423 | } | |
2424 | if (remaining < 0) { | |
55c52718 AS |
2425 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2426 | - remaining); | |
1da177e4 LT |
2427 | remaining = 0; |
2428 | } | |
2429 | return remaining; | |
2430 | } | |
2431 | ||
2432 | /* Handle physical or logical connection change events. | |
2433 | * This routine is called when: | |
2434 | * a port connection-change occurs; | |
2435 | * a port enable-change occurs (often caused by EMI); | |
2436 | * usb_reset_device() encounters changed descriptors (as from | |
2437 | * a firmware download) | |
2438 | * caller already locked the hub | |
2439 | */ | |
2440 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2441 | u16 portstatus, u16 portchange) | |
2442 | { | |
2443 | struct usb_device *hdev = hub->hdev; | |
2444 | struct device *hub_dev = hub->intfdev; | |
74ad9bd2 | 2445 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 LT |
2446 | int status, i; |
2447 | ||
2448 | dev_dbg (hub_dev, | |
2449 | "port %d, status %04x, change %04x, %s\n", | |
2450 | port1, portstatus, portchange, portspeed (portstatus)); | |
2451 | ||
2452 | if (hub->has_indicators) { | |
2453 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2454 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2455 | } | |
2456 | ||
2457 | /* Disconnect any existing devices under this port */ | |
2458 | if (hdev->children[port1-1]) | |
2459 | usb_disconnect(&hdev->children[port1-1]); | |
2460 | clear_bit(port1, hub->change_bits); | |
2461 | ||
2462 | #ifdef CONFIG_USB_OTG | |
2463 | /* during HNP, don't repeat the debounce */ | |
2464 | if (hdev->bus->is_b_host) | |
2465 | portchange &= ~USB_PORT_STAT_C_CONNECTION; | |
2466 | #endif | |
2467 | ||
2468 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2469 | status = hub_port_debounce(hub, port1); | |
2470 | if (status < 0) { | |
2471 | dev_err (hub_dev, | |
2472 | "connect-debounce failed, port %d disabled\n", | |
2473 | port1); | |
2474 | goto done; | |
2475 | } | |
2476 | portstatus = status; | |
2477 | } | |
2478 | ||
2479 | /* Return now if nothing is connected */ | |
2480 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { | |
2481 | ||
2482 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2483 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2484 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2485 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
2486 | ||
2487 | if (portstatus & USB_PORT_STAT_ENABLE) | |
2488 | goto done; | |
2489 | return; | |
2490 | } | |
2491 | ||
2492 | #ifdef CONFIG_USB_SUSPEND | |
2493 | /* If something is connected, but the port is suspended, wake it up. */ | |
2494 | if (portstatus & USB_PORT_STAT_SUSPEND) { | |
2495 | status = hub_port_resume(hub, port1, NULL); | |
2496 | if (status < 0) { | |
2497 | dev_dbg(hub_dev, | |
2498 | "can't clear suspend on port %d; %d\n", | |
2499 | port1, status); | |
2500 | goto done; | |
2501 | } | |
2502 | } | |
2503 | #endif | |
2504 | ||
2505 | for (i = 0; i < SET_CONFIG_TRIES; i++) { | |
2506 | struct usb_device *udev; | |
2507 | ||
2508 | /* reallocate for each attempt, since references | |
2509 | * to the previous one can escape in various ways | |
2510 | */ | |
2511 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
2512 | if (!udev) { | |
2513 | dev_err (hub_dev, | |
2514 | "couldn't allocate port %d usb_device\n", | |
2515 | port1); | |
2516 | goto done; | |
2517 | } | |
2518 | ||
2519 | usb_set_device_state(udev, USB_STATE_POWERED); | |
2520 | udev->speed = USB_SPEED_UNKNOWN; | |
55c52718 | 2521 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 2522 | udev->level = hdev->level + 1; |
55c52718 | 2523 | |
1da177e4 LT |
2524 | /* set the address */ |
2525 | choose_address(udev); | |
2526 | if (udev->devnum <= 0) { | |
2527 | status = -ENOTCONN; /* Don't retry */ | |
2528 | goto loop; | |
2529 | } | |
2530 | ||
2531 | /* reset and get descriptor */ | |
2532 | status = hub_port_init(hub, udev, port1, i); | |
2533 | if (status < 0) | |
2534 | goto loop; | |
2535 | ||
2536 | /* consecutive bus-powered hubs aren't reliable; they can | |
2537 | * violate the voltage drop budget. if the new child has | |
2538 | * a "powered" LED, users should notice we didn't enable it | |
2539 | * (without reading syslog), even without per-port LEDs | |
2540 | * on the parent. | |
2541 | */ | |
2542 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 2543 | && udev->bus_mA <= 100) { |
1da177e4 LT |
2544 | u16 devstat; |
2545 | ||
2546 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
2547 | &devstat); | |
55c52718 | 2548 | if (status < 2) { |
1da177e4 LT |
2549 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
2550 | goto loop_disable; | |
2551 | } | |
55c52718 | 2552 | le16_to_cpus(&devstat); |
1da177e4 LT |
2553 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
2554 | dev_err(&udev->dev, | |
2555 | "can't connect bus-powered hub " | |
2556 | "to this port\n"); | |
2557 | if (hub->has_indicators) { | |
2558 | hub->indicator[port1-1] = | |
2559 | INDICATOR_AMBER_BLINK; | |
c4028958 | 2560 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2561 | } |
2562 | status = -ENOTCONN; /* Don't retry */ | |
2563 | goto loop_disable; | |
2564 | } | |
2565 | } | |
2566 | ||
2567 | /* check for devices running slower than they could */ | |
2568 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
2569 | && udev->speed == USB_SPEED_FULL | |
2570 | && highspeed_hubs != 0) | |
2571 | check_highspeed (hub, udev, port1); | |
2572 | ||
2573 | /* Store the parent's children[] pointer. At this point | |
2574 | * udev becomes globally accessible, although presumably | |
2575 | * no one will look at it until hdev is unlocked. | |
2576 | */ | |
1da177e4 LT |
2577 | status = 0; |
2578 | ||
2579 | /* We mustn't add new devices if the parent hub has | |
2580 | * been disconnected; we would race with the | |
2581 | * recursively_mark_NOTATTACHED() routine. | |
2582 | */ | |
2583 | spin_lock_irq(&device_state_lock); | |
2584 | if (hdev->state == USB_STATE_NOTATTACHED) | |
2585 | status = -ENOTCONN; | |
2586 | else | |
2587 | hdev->children[port1-1] = udev; | |
2588 | spin_unlock_irq(&device_state_lock); | |
2589 | ||
2590 | /* Run it through the hoops (find a driver, etc) */ | |
2591 | if (!status) { | |
2592 | status = usb_new_device(udev); | |
2593 | if (status) { | |
2594 | spin_lock_irq(&device_state_lock); | |
2595 | hdev->children[port1-1] = NULL; | |
2596 | spin_unlock_irq(&device_state_lock); | |
2597 | } | |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | if (status) |
2601 | goto loop_disable; | |
2602 | ||
2603 | status = hub_power_remaining(hub); | |
2604 | if (status) | |
55c52718 | 2605 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
2606 | |
2607 | return; | |
2608 | ||
2609 | loop_disable: | |
2610 | hub_port_disable(hub, port1, 1); | |
2611 | loop: | |
2612 | ep0_reinit(udev); | |
2613 | release_address(udev); | |
2614 | usb_put_dev(udev); | |
2615 | if (status == -ENOTCONN) | |
2616 | break; | |
2617 | } | |
2618 | ||
2619 | done: | |
2620 | hub_port_disable(hub, port1, 1); | |
2621 | } | |
2622 | ||
2623 | static void hub_events(void) | |
2624 | { | |
2625 | struct list_head *tmp; | |
2626 | struct usb_device *hdev; | |
2627 | struct usb_interface *intf; | |
2628 | struct usb_hub *hub; | |
2629 | struct device *hub_dev; | |
2630 | u16 hubstatus; | |
2631 | u16 hubchange; | |
2632 | u16 portstatus; | |
2633 | u16 portchange; | |
2634 | int i, ret; | |
2635 | int connect_change; | |
2636 | ||
2637 | /* | |
2638 | * We restart the list every time to avoid a deadlock with | |
2639 | * deleting hubs downstream from this one. This should be | |
2640 | * safe since we delete the hub from the event list. | |
2641 | * Not the most efficient, but avoids deadlocks. | |
2642 | */ | |
2643 | while (1) { | |
2644 | ||
2645 | /* Grab the first entry at the beginning of the list */ | |
2646 | spin_lock_irq(&hub_event_lock); | |
2647 | if (list_empty(&hub_event_list)) { | |
2648 | spin_unlock_irq(&hub_event_lock); | |
2649 | break; | |
2650 | } | |
2651 | ||
2652 | tmp = hub_event_list.next; | |
2653 | list_del_init(tmp); | |
2654 | ||
2655 | hub = list_entry(tmp, struct usb_hub, event_list); | |
2656 | hdev = hub->hdev; | |
2657 | intf = to_usb_interface(hub->intfdev); | |
2658 | hub_dev = &intf->dev; | |
2659 | ||
40f122f3 | 2660 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
2661 | hdev->state, hub->descriptor |
2662 | ? hub->descriptor->bNbrPorts | |
2663 | : 0, | |
2664 | /* NOTE: expects max 15 ports... */ | |
2665 | (u16) hub->change_bits[0], | |
40f122f3 | 2666 | (u16) hub->event_bits[0]); |
1da177e4 LT |
2667 | |
2668 | usb_get_intf(intf); | |
1da177e4 LT |
2669 | spin_unlock_irq(&hub_event_lock); |
2670 | ||
1da177e4 LT |
2671 | /* Lock the device, then check to see if we were |
2672 | * disconnected while waiting for the lock to succeed. */ | |
2673 | if (locktree(hdev) < 0) { | |
2674 | usb_put_intf(intf); | |
2675 | continue; | |
2676 | } | |
2677 | if (hub != usb_get_intfdata(intf)) | |
2678 | goto loop; | |
2679 | ||
2680 | /* If the hub has died, clean up after it */ | |
2681 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b AS |
2682 | hub->error = -ENODEV; |
2683 | hub_pre_reset(intf); | |
1da177e4 LT |
2684 | goto loop; |
2685 | } | |
2686 | ||
40f122f3 AS |
2687 | /* Autoresume */ |
2688 | ret = usb_autopm_get_interface(intf); | |
2689 | if (ret) { | |
2690 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
2691 | goto loop; | |
2692 | } | |
a8e7c565 | 2693 | |
40f122f3 | 2694 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 2695 | if (hub->quiescing) |
40f122f3 | 2696 | goto loop_autopm; |
1da177e4 LT |
2697 | |
2698 | if (hub->error) { | |
2699 | dev_dbg (hub_dev, "resetting for error %d\n", | |
2700 | hub->error); | |
2701 | ||
7de18d8b | 2702 | ret = usb_reset_composite_device(hdev, intf); |
1da177e4 LT |
2703 | if (ret) { |
2704 | dev_dbg (hub_dev, | |
2705 | "error resetting hub: %d\n", ret); | |
40f122f3 | 2706 | goto loop_autopm; |
1da177e4 LT |
2707 | } |
2708 | ||
2709 | hub->nerrors = 0; | |
2710 | hub->error = 0; | |
2711 | } | |
2712 | ||
2713 | /* deal with port status changes */ | |
2714 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
2715 | if (test_bit(i, hub->busy_bits)) | |
2716 | continue; | |
2717 | connect_change = test_bit(i, hub->change_bits); | |
2718 | if (!test_and_clear_bit(i, hub->event_bits) && | |
2719 | !connect_change && !hub->activating) | |
2720 | continue; | |
2721 | ||
2722 | ret = hub_port_status(hub, i, | |
2723 | &portstatus, &portchange); | |
2724 | if (ret < 0) | |
2725 | continue; | |
2726 | ||
2727 | if (hub->activating && !hdev->children[i-1] && | |
2728 | (portstatus & | |
2729 | USB_PORT_STAT_CONNECTION)) | |
2730 | connect_change = 1; | |
2731 | ||
2732 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2733 | clear_port_feature(hdev, i, | |
2734 | USB_PORT_FEAT_C_CONNECTION); | |
2735 | connect_change = 1; | |
2736 | } | |
2737 | ||
2738 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
2739 | if (!connect_change) | |
2740 | dev_dbg (hub_dev, | |
2741 | "port %d enable change, " | |
2742 | "status %08x\n", | |
2743 | i, portstatus); | |
2744 | clear_port_feature(hdev, i, | |
2745 | USB_PORT_FEAT_C_ENABLE); | |
2746 | ||
2747 | /* | |
2748 | * EM interference sometimes causes badly | |
2749 | * shielded USB devices to be shutdown by | |
2750 | * the hub, this hack enables them again. | |
2751 | * Works at least with mouse driver. | |
2752 | */ | |
2753 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
2754 | && !connect_change | |
2755 | && hdev->children[i-1]) { | |
2756 | dev_err (hub_dev, | |
2757 | "port %i " | |
2758 | "disabled by hub (EMI?), " | |
2759 | "re-enabling...\n", | |
2760 | i); | |
2761 | connect_change = 1; | |
2762 | } | |
2763 | } | |
2764 | ||
2765 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
2766 | clear_port_feature(hdev, i, | |
2767 | USB_PORT_FEAT_C_SUSPEND); | |
2768 | if (hdev->children[i-1]) { | |
2769 | ret = remote_wakeup(hdev-> | |
2770 | children[i-1]); | |
2771 | if (ret < 0) | |
2772 | connect_change = 1; | |
2773 | } else { | |
2774 | ret = -ENODEV; | |
2775 | hub_port_disable(hub, i, 1); | |
2776 | } | |
2777 | dev_dbg (hub_dev, | |
2778 | "resume on port %d, status %d\n", | |
2779 | i, ret); | |
2780 | } | |
2781 | ||
2782 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
2783 | dev_err (hub_dev, | |
2784 | "over-current change on port %d\n", | |
2785 | i); | |
2786 | clear_port_feature(hdev, i, | |
2787 | USB_PORT_FEAT_C_OVER_CURRENT); | |
2788 | hub_power_on(hub); | |
2789 | } | |
2790 | ||
2791 | if (portchange & USB_PORT_STAT_C_RESET) { | |
2792 | dev_dbg (hub_dev, | |
2793 | "reset change on port %d\n", | |
2794 | i); | |
2795 | clear_port_feature(hdev, i, | |
2796 | USB_PORT_FEAT_C_RESET); | |
2797 | } | |
2798 | ||
2799 | if (connect_change) | |
2800 | hub_port_connect_change(hub, i, | |
2801 | portstatus, portchange); | |
2802 | } /* end for i */ | |
2803 | ||
2804 | /* deal with hub status changes */ | |
2805 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
2806 | ; /* do nothing */ | |
2807 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
2808 | dev_err (hub_dev, "get_hub_status failed\n"); | |
2809 | else { | |
2810 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
2811 | dev_dbg (hub_dev, "power change\n"); | |
2812 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
2813 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
2814 | /* FIXME: Is this always true? */ | |
2815 | hub->limited_power = 0; | |
2816 | else | |
2817 | hub->limited_power = 1; | |
1da177e4 LT |
2818 | } |
2819 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
2820 | dev_dbg (hub_dev, "overcurrent change\n"); | |
2821 | msleep(500); /* Cool down */ | |
2822 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
2823 | hub_power_on(hub); | |
2824 | } | |
2825 | } | |
2826 | ||
2827 | hub->activating = 0; | |
2828 | ||
d5926ae7 AS |
2829 | /* If this is a root hub, tell the HCD it's okay to |
2830 | * re-enable port-change interrupts now. */ | |
d5cbad4b | 2831 | if (!hdev->parent && !hub->busy_bits[0]) |
d5926ae7 AS |
2832 | usb_enable_root_hub_irq(hdev->bus); |
2833 | ||
40f122f3 AS |
2834 | loop_autopm: |
2835 | /* Allow autosuspend if we're not going to run again */ | |
2836 | if (list_empty(&hub->event_list)) | |
2837 | usb_autopm_enable(intf); | |
1da177e4 LT |
2838 | loop: |
2839 | usb_unlock_device(hdev); | |
2840 | usb_put_intf(intf); | |
2841 | ||
2842 | } /* end while (1) */ | |
2843 | } | |
2844 | ||
2845 | static int hub_thread(void *__unused) | |
2846 | { | |
1da177e4 LT |
2847 | do { |
2848 | hub_events(); | |
9c8d6178 | 2849 | wait_event_interruptible(khubd_wait, |
2850 | !list_empty(&hub_event_list) || | |
2851 | kthread_should_stop()); | |
3e1d1d28 | 2852 | try_to_freeze(); |
9c8d6178 | 2853 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 2854 | |
9c8d6178 | 2855 | pr_debug("%s: khubd exiting\n", usbcore_name); |
2856 | return 0; | |
1da177e4 LT |
2857 | } |
2858 | ||
2859 | static struct usb_device_id hub_id_table [] = { | |
2860 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
2861 | .bDeviceClass = USB_CLASS_HUB}, | |
2862 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
2863 | .bInterfaceClass = USB_CLASS_HUB}, | |
2864 | { } /* Terminating entry */ | |
2865 | }; | |
2866 | ||
2867 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
2868 | ||
2869 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
2870 | .name = "hub", |
2871 | .probe = hub_probe, | |
2872 | .disconnect = hub_disconnect, | |
2873 | .suspend = hub_suspend, | |
2874 | .resume = hub_resume, | |
7de18d8b AS |
2875 | .pre_reset = hub_pre_reset, |
2876 | .post_reset = hub_post_reset, | |
1da177e4 LT |
2877 | .ioctl = hub_ioctl, |
2878 | .id_table = hub_id_table, | |
40f122f3 | 2879 | .supports_autosuspend = 1, |
1da177e4 LT |
2880 | }; |
2881 | ||
2882 | int usb_hub_init(void) | |
2883 | { | |
1da177e4 LT |
2884 | if (usb_register(&hub_driver) < 0) { |
2885 | printk(KERN_ERR "%s: can't register hub driver\n", | |
2886 | usbcore_name); | |
2887 | return -1; | |
2888 | } | |
2889 | ||
9c8d6178 | 2890 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
2891 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 2892 | return 0; |
1da177e4 LT |
2893 | |
2894 | /* Fall through if kernel_thread failed */ | |
2895 | usb_deregister(&hub_driver); | |
2896 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
2897 | ||
2898 | return -1; | |
2899 | } | |
2900 | ||
2901 | void usb_hub_cleanup(void) | |
2902 | { | |
9c8d6178 | 2903 | kthread_stop(khubd_task); |
1da177e4 LT |
2904 | |
2905 | /* | |
2906 | * Hub resources are freed for us by usb_deregister. It calls | |
2907 | * usb_driver_purge on every device which in turn calls that | |
2908 | * devices disconnect function if it is using this driver. | |
2909 | * The hub_disconnect function takes care of releasing the | |
2910 | * individual hub resources. -greg | |
2911 | */ | |
2912 | usb_deregister(&hub_driver); | |
2913 | } /* usb_hub_cleanup() */ | |
2914 | ||
1da177e4 LT |
2915 | static int config_descriptors_changed(struct usb_device *udev) |
2916 | { | |
2917 | unsigned index; | |
2918 | unsigned len = 0; | |
2919 | struct usb_config_descriptor *buf; | |
2920 | ||
2921 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2922 | if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) | |
2923 | len = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2924 | } | |
2925 | buf = kmalloc (len, SLAB_KERNEL); | |
2926 | if (buf == NULL) { | |
2927 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
2928 | /* assume the worst */ | |
2929 | return 1; | |
2930 | } | |
2931 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2932 | int length; | |
2933 | int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2934 | ||
2935 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, | |
2936 | old_length); | |
2937 | if (length < old_length) { | |
2938 | dev_dbg(&udev->dev, "config index %d, error %d\n", | |
2939 | index, length); | |
2940 | break; | |
2941 | } | |
2942 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
2943 | != 0) { | |
2944 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
2945 | index, buf->bConfigurationValue); | |
2946 | break; | |
2947 | } | |
2948 | } | |
2949 | kfree(buf); | |
2950 | return index != udev->descriptor.bNumConfigurations; | |
2951 | } | |
2952 | ||
2953 | /** | |
2954 | * usb_reset_device - perform a USB port reset to reinitialize a device | |
2955 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) | |
2956 | * | |
79efa097 AS |
2957 | * WARNING - don't use this routine to reset a composite device |
2958 | * (one with multiple interfaces owned by separate drivers)! | |
2959 | * Use usb_reset_composite_device() instead. | |
1da177e4 LT |
2960 | * |
2961 | * Do a port reset, reassign the device's address, and establish its | |
2962 | * former operating configuration. If the reset fails, or the device's | |
2963 | * descriptors change from their values before the reset, or the original | |
2964 | * configuration and altsettings cannot be restored, a flag will be set | |
2965 | * telling khubd to pretend the device has been disconnected and then | |
2966 | * re-connected. All drivers will be unbound, and the device will be | |
2967 | * re-enumerated and probed all over again. | |
2968 | * | |
2969 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
2970 | * flagged for logical disconnection, or some other negative error code | |
2971 | * if the reset wasn't even attempted. | |
2972 | * | |
2973 | * The caller must own the device lock. For example, it's safe to use | |
2974 | * this from a driver probe() routine after downloading new firmware. | |
2975 | * For calls that might not occur during probe(), drivers should lock | |
2976 | * the device using usb_lock_device_for_reset(). | |
2977 | */ | |
2978 | int usb_reset_device(struct usb_device *udev) | |
2979 | { | |
2980 | struct usb_device *parent_hdev = udev->parent; | |
2981 | struct usb_hub *parent_hub; | |
2982 | struct usb_device_descriptor descriptor = udev->descriptor; | |
12c3da34 AS |
2983 | int i, ret = 0; |
2984 | int port1 = udev->portnum; | |
1da177e4 LT |
2985 | |
2986 | if (udev->state == USB_STATE_NOTATTACHED || | |
2987 | udev->state == USB_STATE_SUSPENDED) { | |
2988 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
2989 | udev->state); | |
2990 | return -EINVAL; | |
2991 | } | |
2992 | ||
2993 | if (!parent_hdev) { | |
2994 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
2995 | dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); | |
2996 | return -EISDIR; | |
2997 | } | |
1da177e4 LT |
2998 | parent_hub = hdev_to_hub(parent_hdev); |
2999 | ||
1da177e4 LT |
3000 | set_bit(port1, parent_hub->busy_bits); |
3001 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3002 | ||
3003 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3004 | * Other endpoints will be handled by re-enumeration. */ | |
3005 | ep0_reinit(udev); | |
3006 | ret = hub_port_init(parent_hub, udev, port1, i); | |
3007 | if (ret >= 0) | |
3008 | break; | |
3009 | } | |
3010 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b AS |
3011 | if (!parent_hdev->parent && !parent_hub->busy_bits[0]) |
3012 | usb_enable_root_hub_irq(parent_hdev->bus); | |
3013 | ||
1da177e4 LT |
3014 | if (ret < 0) |
3015 | goto re_enumerate; | |
3016 | ||
3017 | /* Device might have changed firmware (DFU or similar) */ | |
3018 | if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) | |
3019 | || config_descriptors_changed (udev)) { | |
3020 | dev_info(&udev->dev, "device firmware changed\n"); | |
3021 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3022 | goto re_enumerate; | |
3023 | } | |
3024 | ||
3025 | if (!udev->actconfig) | |
3026 | goto done; | |
3027 | ||
3028 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3029 | USB_REQ_SET_CONFIGURATION, 0, | |
3030 | udev->actconfig->desc.bConfigurationValue, 0, | |
3031 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3032 | if (ret < 0) { | |
3033 | dev_err(&udev->dev, | |
3034 | "can't restore configuration #%d (error=%d)\n", | |
3035 | udev->actconfig->desc.bConfigurationValue, ret); | |
3036 | goto re_enumerate; | |
3037 | } | |
3038 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3039 | ||
3040 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
3041 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3042 | struct usb_interface_descriptor *desc; | |
3043 | ||
3044 | /* set_interface resets host side toggle even | |
3045 | * for altsetting zero. the interface may have no driver. | |
3046 | */ | |
3047 | desc = &intf->cur_altsetting->desc; | |
3048 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3049 | desc->bAlternateSetting); | |
3050 | if (ret < 0) { | |
3051 | dev_err(&udev->dev, "failed to restore interface %d " | |
3052 | "altsetting %d (error=%d)\n", | |
3053 | desc->bInterfaceNumber, | |
3054 | desc->bAlternateSetting, | |
3055 | ret); | |
3056 | goto re_enumerate; | |
3057 | } | |
3058 | } | |
3059 | ||
3060 | done: | |
1da177e4 LT |
3061 | return 0; |
3062 | ||
3063 | re_enumerate: | |
3064 | hub_port_logical_disconnect(parent_hub, port1); | |
3065 | return -ENODEV; | |
3066 | } | |
140d8f68 | 3067 | EXPORT_SYMBOL(usb_reset_device); |
79efa097 AS |
3068 | |
3069 | /** | |
3070 | * usb_reset_composite_device - warn interface drivers and perform a USB port reset | |
3071 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) | |
3072 | * @iface: interface bound to the driver making the request (optional) | |
3073 | * | |
3074 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3075 | * method), performs the port reset, and then lets the drivers know that | |
3076 | * the reset is over (using their post_reset method). | |
3077 | * | |
3078 | * Return value is the same as for usb_reset_device(). | |
3079 | * | |
3080 | * The caller must own the device lock. For example, it's safe to use | |
3081 | * this from a driver probe() routine after downloading new firmware. | |
3082 | * For calls that might not occur during probe(), drivers should lock | |
3083 | * the device using usb_lock_device_for_reset(). | |
3084 | * | |
3085 | * The interface locks are acquired during the pre_reset stage and released | |
3086 | * during the post_reset stage. However if iface is not NULL and is | |
3087 | * currently being probed, we assume that the caller already owns its | |
3088 | * lock. | |
3089 | */ | |
3090 | int usb_reset_composite_device(struct usb_device *udev, | |
3091 | struct usb_interface *iface) | |
3092 | { | |
3093 | int ret; | |
3094 | struct usb_host_config *config = udev->actconfig; | |
3095 | ||
3096 | if (udev->state == USB_STATE_NOTATTACHED || | |
3097 | udev->state == USB_STATE_SUSPENDED) { | |
3098 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3099 | udev->state); | |
3100 | return -EINVAL; | |
3101 | } | |
3102 | ||
645daaab | 3103 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3104 | usb_autoresume_device(udev); |
645daaab | 3105 | |
79efa097 AS |
3106 | if (iface && iface->condition != USB_INTERFACE_BINDING) |
3107 | iface = NULL; | |
3108 | ||
3109 | if (config) { | |
3110 | int i; | |
3111 | struct usb_interface *cintf; | |
3112 | struct usb_driver *drv; | |
3113 | ||
3114 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
3115 | cintf = config->interface[i]; | |
3116 | if (cintf != iface) | |
3117 | down(&cintf->dev.sem); | |
3118 | if (device_is_registered(&cintf->dev) && | |
3119 | cintf->dev.driver) { | |
3120 | drv = to_usb_driver(cintf->dev.driver); | |
3121 | if (drv->pre_reset) | |
3122 | (drv->pre_reset)(cintf); | |
3123 | } | |
3124 | } | |
3125 | } | |
3126 | ||
3127 | ret = usb_reset_device(udev); | |
3128 | ||
3129 | if (config) { | |
3130 | int i; | |
3131 | struct usb_interface *cintf; | |
3132 | struct usb_driver *drv; | |
3133 | ||
3134 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { | |
3135 | cintf = config->interface[i]; | |
3136 | if (device_is_registered(&cintf->dev) && | |
3137 | cintf->dev.driver) { | |
3138 | drv = to_usb_driver(cintf->dev.driver); | |
3139 | if (drv->post_reset) | |
3140 | (drv->post_reset)(cintf); | |
3141 | } | |
3142 | if (cintf != iface) | |
3143 | up(&cintf->dev.sem); | |
3144 | } | |
3145 | } | |
3146 | ||
94fcda1f | 3147 | usb_autosuspend_device(udev); |
79efa097 AS |
3148 | return ret; |
3149 | } | |
140d8f68 | 3150 | EXPORT_SYMBOL(usb_reset_composite_device); |