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1 | /* | |
2 | * message.c - synchronous message handling | |
3 | */ | |
4 | ||
5 | #include <linux/pci.h> /* for scatterlist macros */ | |
6 | #include <linux/usb.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/ctype.h> | |
12 | #include <linux/nls.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/scatterlist.h> | |
15 | #include <linux/usb/cdc.h> | |
16 | #include <linux/usb/quirks.h> | |
17 | #include <linux/usb/hcd.h> /* for usbcore internals */ | |
18 | #include <asm/byteorder.h> | |
19 | ||
20 | #include "usb.h" | |
21 | ||
22 | static void cancel_async_set_config(struct usb_device *udev); | |
23 | ||
24 | struct api_context { | |
25 | struct completion done; | |
26 | int status; | |
27 | }; | |
28 | ||
29 | static void usb_api_blocking_completion(struct urb *urb) | |
30 | { | |
31 | struct api_context *ctx = urb->context; | |
32 | ||
33 | ctx->status = urb->status; | |
34 | complete(&ctx->done); | |
35 | } | |
36 | ||
37 | ||
38 | /* | |
39 | * Starts urb and waits for completion or timeout. Note that this call | |
40 | * is NOT interruptible. Many device driver i/o requests should be | |
41 | * interruptible and therefore these drivers should implement their | |
42 | * own interruptible routines. | |
43 | */ | |
44 | static int usb_start_wait_urb(struct urb *urb, int timeout, int *actual_length) | |
45 | { | |
46 | struct api_context ctx; | |
47 | unsigned long expire; | |
48 | int retval; | |
49 | ||
50 | init_completion(&ctx.done); | |
51 | urb->context = &ctx; | |
52 | urb->actual_length = 0; | |
53 | retval = usb_submit_urb(urb, GFP_NOIO); | |
54 | if (unlikely(retval)) | |
55 | goto out; | |
56 | ||
57 | expire = timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT; | |
58 | if (!wait_for_completion_timeout(&ctx.done, expire)) { | |
59 | usb_kill_urb(urb); | |
60 | retval = (ctx.status == -ENOENT ? -ETIMEDOUT : ctx.status); | |
61 | ||
62 | dev_dbg(&urb->dev->dev, | |
63 | "%s timed out on ep%d%s len=%u/%u\n", | |
64 | current->comm, | |
65 | usb_endpoint_num(&urb->ep->desc), | |
66 | usb_urb_dir_in(urb) ? "in" : "out", | |
67 | urb->actual_length, | |
68 | urb->transfer_buffer_length); | |
69 | } else | |
70 | retval = ctx.status; | |
71 | out: | |
72 | if (actual_length) | |
73 | *actual_length = urb->actual_length; | |
74 | ||
75 | usb_free_urb(urb); | |
76 | return retval; | |
77 | } | |
78 | ||
79 | /*-------------------------------------------------------------------*/ | |
80 | /* returns status (negative) or length (positive) */ | |
81 | static int usb_internal_control_msg(struct usb_device *usb_dev, | |
82 | unsigned int pipe, | |
83 | struct usb_ctrlrequest *cmd, | |
84 | void *data, int len, int timeout) | |
85 | { | |
86 | struct urb *urb; | |
87 | int retv; | |
88 | int length; | |
89 | ||
90 | urb = usb_alloc_urb(0, GFP_NOIO); | |
91 | if (!urb) | |
92 | return -ENOMEM; | |
93 | ||
94 | usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char *)cmd, data, | |
95 | len, usb_api_blocking_completion, NULL); | |
96 | ||
97 | retv = usb_start_wait_urb(urb, timeout, &length); | |
98 | if (retv < 0) | |
99 | return retv; | |
100 | else | |
101 | return length; | |
102 | } | |
103 | ||
104 | /** | |
105 | * usb_control_msg - Builds a control urb, sends it off and waits for completion | |
106 | * @dev: pointer to the usb device to send the message to | |
107 | * @pipe: endpoint "pipe" to send the message to | |
108 | * @request: USB message request value | |
109 | * @requesttype: USB message request type value | |
110 | * @value: USB message value | |
111 | * @index: USB message index value | |
112 | * @data: pointer to the data to send | |
113 | * @size: length in bytes of the data to send | |
114 | * @timeout: time in msecs to wait for the message to complete before timing | |
115 | * out (if 0 the wait is forever) | |
116 | * | |
117 | * Context: !in_interrupt () | |
118 | * | |
119 | * This function sends a simple control message to a specified endpoint and | |
120 | * waits for the message to complete, or timeout. | |
121 | * | |
122 | * Don't use this function from within an interrupt context, like a bottom half | |
123 | * handler. If you need an asynchronous message, or need to send a message | |
124 | * from within interrupt context, use usb_submit_urb(). | |
125 | * If a thread in your driver uses this call, make sure your disconnect() | |
126 | * method can wait for it to complete. Since you don't have a handle on the | |
127 | * URB used, you can't cancel the request. | |
128 | * | |
129 | * Return: If successful, the number of bytes transferred. Otherwise, a negative | |
130 | * error number. | |
131 | */ | |
132 | int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, | |
133 | __u8 requesttype, __u16 value, __u16 index, void *data, | |
134 | __u16 size, int timeout) | |
135 | { | |
136 | struct usb_ctrlrequest *dr; | |
137 | int ret; | |
138 | ||
139 | dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO); | |
140 | if (!dr) | |
141 | return -ENOMEM; | |
142 | ||
143 | dr->bRequestType = requesttype; | |
144 | dr->bRequest = request; | |
145 | dr->wValue = cpu_to_le16(value); | |
146 | dr->wIndex = cpu_to_le16(index); | |
147 | dr->wLength = cpu_to_le16(size); | |
148 | ||
149 | ret = usb_internal_control_msg(dev, pipe, dr, data, size, timeout); | |
150 | ||
151 | kfree(dr); | |
152 | ||
153 | return ret; | |
154 | } | |
155 | EXPORT_SYMBOL_GPL(usb_control_msg); | |
156 | ||
157 | /** | |
158 | * usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion | |
159 | * @usb_dev: pointer to the usb device to send the message to | |
160 | * @pipe: endpoint "pipe" to send the message to | |
161 | * @data: pointer to the data to send | |
162 | * @len: length in bytes of the data to send | |
163 | * @actual_length: pointer to a location to put the actual length transferred | |
164 | * in bytes | |
165 | * @timeout: time in msecs to wait for the message to complete before | |
166 | * timing out (if 0 the wait is forever) | |
167 | * | |
168 | * Context: !in_interrupt () | |
169 | * | |
170 | * This function sends a simple interrupt message to a specified endpoint and | |
171 | * waits for the message to complete, or timeout. | |
172 | * | |
173 | * Don't use this function from within an interrupt context, like a bottom half | |
174 | * handler. If you need an asynchronous message, or need to send a message | |
175 | * from within interrupt context, use usb_submit_urb() If a thread in your | |
176 | * driver uses this call, make sure your disconnect() method can wait for it to | |
177 | * complete. Since you don't have a handle on the URB used, you can't cancel | |
178 | * the request. | |
179 | * | |
180 | * Return: | |
181 | * If successful, 0. Otherwise a negative error number. The number of actual | |
182 | * bytes transferred will be stored in the @actual_length parameter. | |
183 | */ | |
184 | int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, | |
185 | void *data, int len, int *actual_length, int timeout) | |
186 | { | |
187 | return usb_bulk_msg(usb_dev, pipe, data, len, actual_length, timeout); | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(usb_interrupt_msg); | |
190 | ||
191 | /** | |
192 | * usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion | |
193 | * @usb_dev: pointer to the usb device to send the message to | |
194 | * @pipe: endpoint "pipe" to send the message to | |
195 | * @data: pointer to the data to send | |
196 | * @len: length in bytes of the data to send | |
197 | * @actual_length: pointer to a location to put the actual length transferred | |
198 | * in bytes | |
199 | * @timeout: time in msecs to wait for the message to complete before | |
200 | * timing out (if 0 the wait is forever) | |
201 | * | |
202 | * Context: !in_interrupt () | |
203 | * | |
204 | * This function sends a simple bulk message to a specified endpoint | |
205 | * and waits for the message to complete, or timeout. | |
206 | * | |
207 | * Don't use this function from within an interrupt context, like a bottom half | |
208 | * handler. If you need an asynchronous message, or need to send a message | |
209 | * from within interrupt context, use usb_submit_urb() If a thread in your | |
210 | * driver uses this call, make sure your disconnect() method can wait for it to | |
211 | * complete. Since you don't have a handle on the URB used, you can't cancel | |
212 | * the request. | |
213 | * | |
214 | * Because there is no usb_interrupt_msg() and no USBDEVFS_INTERRUPT ioctl, | |
215 | * users are forced to abuse this routine by using it to submit URBs for | |
216 | * interrupt endpoints. We will take the liberty of creating an interrupt URB | |
217 | * (with the default interval) if the target is an interrupt endpoint. | |
218 | * | |
219 | * Return: | |
220 | * If successful, 0. Otherwise a negative error number. The number of actual | |
221 | * bytes transferred will be stored in the @actual_length parameter. | |
222 | * | |
223 | */ | |
224 | int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, | |
225 | void *data, int len, int *actual_length, int timeout) | |
226 | { | |
227 | struct urb *urb; | |
228 | struct usb_host_endpoint *ep; | |
229 | ||
230 | ep = usb_pipe_endpoint(usb_dev, pipe); | |
231 | if (!ep || len < 0) | |
232 | return -EINVAL; | |
233 | ||
234 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
235 | if (!urb) | |
236 | return -ENOMEM; | |
237 | ||
238 | if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == | |
239 | USB_ENDPOINT_XFER_INT) { | |
240 | pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30); | |
241 | usb_fill_int_urb(urb, usb_dev, pipe, data, len, | |
242 | usb_api_blocking_completion, NULL, | |
243 | ep->desc.bInterval); | |
244 | } else | |
245 | usb_fill_bulk_urb(urb, usb_dev, pipe, data, len, | |
246 | usb_api_blocking_completion, NULL); | |
247 | ||
248 | return usb_start_wait_urb(urb, timeout, actual_length); | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(usb_bulk_msg); | |
251 | ||
252 | /*-------------------------------------------------------------------*/ | |
253 | ||
254 | static void sg_clean(struct usb_sg_request *io) | |
255 | { | |
256 | if (io->urbs) { | |
257 | while (io->entries--) | |
258 | usb_free_urb(io->urbs[io->entries]); | |
259 | kfree(io->urbs); | |
260 | io->urbs = NULL; | |
261 | } | |
262 | io->dev = NULL; | |
263 | } | |
264 | ||
265 | static void sg_complete(struct urb *urb) | |
266 | { | |
267 | struct usb_sg_request *io = urb->context; | |
268 | int status = urb->status; | |
269 | ||
270 | spin_lock(&io->lock); | |
271 | ||
272 | /* In 2.5 we require hcds' endpoint queues not to progress after fault | |
273 | * reports, until the completion callback (this!) returns. That lets | |
274 | * device driver code (like this routine) unlink queued urbs first, | |
275 | * if it needs to, since the HC won't work on them at all. So it's | |
276 | * not possible for page N+1 to overwrite page N, and so on. | |
277 | * | |
278 | * That's only for "hard" faults; "soft" faults (unlinks) sometimes | |
279 | * complete before the HCD can get requests away from hardware, | |
280 | * though never during cleanup after a hard fault. | |
281 | */ | |
282 | if (io->status | |
283 | && (io->status != -ECONNRESET | |
284 | || status != -ECONNRESET) | |
285 | && urb->actual_length) { | |
286 | dev_err(io->dev->bus->controller, | |
287 | "dev %s ep%d%s scatterlist error %d/%d\n", | |
288 | io->dev->devpath, | |
289 | usb_endpoint_num(&urb->ep->desc), | |
290 | usb_urb_dir_in(urb) ? "in" : "out", | |
291 | status, io->status); | |
292 | /* BUG (); */ | |
293 | } | |
294 | ||
295 | if (io->status == 0 && status && status != -ECONNRESET) { | |
296 | int i, found, retval; | |
297 | ||
298 | io->status = status; | |
299 | ||
300 | /* the previous urbs, and this one, completed already. | |
301 | * unlink pending urbs so they won't rx/tx bad data. | |
302 | * careful: unlink can sometimes be synchronous... | |
303 | */ | |
304 | spin_unlock(&io->lock); | |
305 | for (i = 0, found = 0; i < io->entries; i++) { | |
306 | if (!io->urbs[i]) | |
307 | continue; | |
308 | if (found) { | |
309 | usb_block_urb(io->urbs[i]); | |
310 | retval = usb_unlink_urb(io->urbs[i]); | |
311 | if (retval != -EINPROGRESS && | |
312 | retval != -ENODEV && | |
313 | retval != -EBUSY && | |
314 | retval != -EIDRM) | |
315 | dev_err(&io->dev->dev, | |
316 | "%s, unlink --> %d\n", | |
317 | __func__, retval); | |
318 | } else if (urb == io->urbs[i]) | |
319 | found = 1; | |
320 | } | |
321 | spin_lock(&io->lock); | |
322 | } | |
323 | ||
324 | /* on the last completion, signal usb_sg_wait() */ | |
325 | io->bytes += urb->actual_length; | |
326 | io->count--; | |
327 | if (!io->count) | |
328 | complete(&io->complete); | |
329 | ||
330 | spin_unlock(&io->lock); | |
331 | } | |
332 | ||
333 | ||
334 | /** | |
335 | * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request | |
336 | * @io: request block being initialized. until usb_sg_wait() returns, | |
337 | * treat this as a pointer to an opaque block of memory, | |
338 | * @dev: the usb device that will send or receive the data | |
339 | * @pipe: endpoint "pipe" used to transfer the data | |
340 | * @period: polling rate for interrupt endpoints, in frames or | |
341 | * (for high speed endpoints) microframes; ignored for bulk | |
342 | * @sg: scatterlist entries | |
343 | * @nents: how many entries in the scatterlist | |
344 | * @length: how many bytes to send from the scatterlist, or zero to | |
345 | * send every byte identified in the list. | |
346 | * @mem_flags: SLAB_* flags affecting memory allocations in this call | |
347 | * | |
348 | * This initializes a scatter/gather request, allocating resources such as | |
349 | * I/O mappings and urb memory (except maybe memory used by USB controller | |
350 | * drivers). | |
351 | * | |
352 | * The request must be issued using usb_sg_wait(), which waits for the I/O to | |
353 | * complete (or to be canceled) and then cleans up all resources allocated by | |
354 | * usb_sg_init(). | |
355 | * | |
356 | * The request may be canceled with usb_sg_cancel(), either before or after | |
357 | * usb_sg_wait() is called. | |
358 | * | |
359 | * Return: Zero for success, else a negative errno value. | |
360 | */ | |
361 | int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev, | |
362 | unsigned pipe, unsigned period, struct scatterlist *sg, | |
363 | int nents, size_t length, gfp_t mem_flags) | |
364 | { | |
365 | int i; | |
366 | int urb_flags; | |
367 | int use_sg; | |
368 | ||
369 | if (!io || !dev || !sg | |
370 | || usb_pipecontrol(pipe) | |
371 | || usb_pipeisoc(pipe) | |
372 | || nents <= 0) | |
373 | return -EINVAL; | |
374 | ||
375 | spin_lock_init(&io->lock); | |
376 | io->dev = dev; | |
377 | io->pipe = pipe; | |
378 | ||
379 | if (dev->bus->sg_tablesize > 0) { | |
380 | use_sg = true; | |
381 | io->entries = 1; | |
382 | } else { | |
383 | use_sg = false; | |
384 | io->entries = nents; | |
385 | } | |
386 | ||
387 | /* initialize all the urbs we'll use */ | |
388 | io->urbs = kmalloc(io->entries * sizeof(*io->urbs), mem_flags); | |
389 | if (!io->urbs) | |
390 | goto nomem; | |
391 | ||
392 | urb_flags = URB_NO_INTERRUPT; | |
393 | if (usb_pipein(pipe)) | |
394 | urb_flags |= URB_SHORT_NOT_OK; | |
395 | ||
396 | for_each_sg(sg, sg, io->entries, i) { | |
397 | struct urb *urb; | |
398 | unsigned len; | |
399 | ||
400 | urb = usb_alloc_urb(0, mem_flags); | |
401 | if (!urb) { | |
402 | io->entries = i; | |
403 | goto nomem; | |
404 | } | |
405 | io->urbs[i] = urb; | |
406 | ||
407 | urb->dev = NULL; | |
408 | urb->pipe = pipe; | |
409 | urb->interval = period; | |
410 | urb->transfer_flags = urb_flags; | |
411 | urb->complete = sg_complete; | |
412 | urb->context = io; | |
413 | urb->sg = sg; | |
414 | ||
415 | if (use_sg) { | |
416 | /* There is no single transfer buffer */ | |
417 | urb->transfer_buffer = NULL; | |
418 | urb->num_sgs = nents; | |
419 | ||
420 | /* A length of zero means transfer the whole sg list */ | |
421 | len = length; | |
422 | if (len == 0) { | |
423 | struct scatterlist *sg2; | |
424 | int j; | |
425 | ||
426 | for_each_sg(sg, sg2, nents, j) | |
427 | len += sg2->length; | |
428 | } | |
429 | } else { | |
430 | /* | |
431 | * Some systems can't use DMA; they use PIO instead. | |
432 | * For their sakes, transfer_buffer is set whenever | |
433 | * possible. | |
434 | */ | |
435 | if (!PageHighMem(sg_page(sg))) | |
436 | urb->transfer_buffer = sg_virt(sg); | |
437 | else | |
438 | urb->transfer_buffer = NULL; | |
439 | ||
440 | len = sg->length; | |
441 | if (length) { | |
442 | len = min_t(size_t, len, length); | |
443 | length -= len; | |
444 | if (length == 0) | |
445 | io->entries = i + 1; | |
446 | } | |
447 | } | |
448 | urb->transfer_buffer_length = len; | |
449 | } | |
450 | io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT; | |
451 | ||
452 | /* transaction state */ | |
453 | io->count = io->entries; | |
454 | io->status = 0; | |
455 | io->bytes = 0; | |
456 | init_completion(&io->complete); | |
457 | return 0; | |
458 | ||
459 | nomem: | |
460 | sg_clean(io); | |
461 | return -ENOMEM; | |
462 | } | |
463 | EXPORT_SYMBOL_GPL(usb_sg_init); | |
464 | ||
465 | /** | |
466 | * usb_sg_wait - synchronously execute scatter/gather request | |
467 | * @io: request block handle, as initialized with usb_sg_init(). | |
468 | * some fields become accessible when this call returns. | |
469 | * Context: !in_interrupt () | |
470 | * | |
471 | * This function blocks until the specified I/O operation completes. It | |
472 | * leverages the grouping of the related I/O requests to get good transfer | |
473 | * rates, by queueing the requests. At higher speeds, such queuing can | |
474 | * significantly improve USB throughput. | |
475 | * | |
476 | * There are three kinds of completion for this function. | |
477 | * (1) success, where io->status is zero. The number of io->bytes | |
478 | * transferred is as requested. | |
479 | * (2) error, where io->status is a negative errno value. The number | |
480 | * of io->bytes transferred before the error is usually less | |
481 | * than requested, and can be nonzero. | |
482 | * (3) cancellation, a type of error with status -ECONNRESET that | |
483 | * is initiated by usb_sg_cancel(). | |
484 | * | |
485 | * When this function returns, all memory allocated through usb_sg_init() or | |
486 | * this call will have been freed. The request block parameter may still be | |
487 | * passed to usb_sg_cancel(), or it may be freed. It could also be | |
488 | * reinitialized and then reused. | |
489 | * | |
490 | * Data Transfer Rates: | |
491 | * | |
492 | * Bulk transfers are valid for full or high speed endpoints. | |
493 | * The best full speed data rate is 19 packets of 64 bytes each | |
494 | * per frame, or 1216 bytes per millisecond. | |
495 | * The best high speed data rate is 13 packets of 512 bytes each | |
496 | * per microframe, or 52 KBytes per millisecond. | |
497 | * | |
498 | * The reason to use interrupt transfers through this API would most likely | |
499 | * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond | |
500 | * could be transferred. That capability is less useful for low or full | |
501 | * speed interrupt endpoints, which allow at most one packet per millisecond, | |
502 | * of at most 8 or 64 bytes (respectively). | |
503 | * | |
504 | * It is not necessary to call this function to reserve bandwidth for devices | |
505 | * under an xHCI host controller, as the bandwidth is reserved when the | |
506 | * configuration or interface alt setting is selected. | |
507 | */ | |
508 | void usb_sg_wait(struct usb_sg_request *io) | |
509 | { | |
510 | int i; | |
511 | int entries = io->entries; | |
512 | ||
513 | /* queue the urbs. */ | |
514 | spin_lock_irq(&io->lock); | |
515 | i = 0; | |
516 | while (i < entries && !io->status) { | |
517 | int retval; | |
518 | ||
519 | io->urbs[i]->dev = io->dev; | |
520 | spin_unlock_irq(&io->lock); | |
521 | ||
522 | retval = usb_submit_urb(io->urbs[i], GFP_NOIO); | |
523 | ||
524 | switch (retval) { | |
525 | /* maybe we retrying will recover */ | |
526 | case -ENXIO: /* hc didn't queue this one */ | |
527 | case -EAGAIN: | |
528 | case -ENOMEM: | |
529 | retval = 0; | |
530 | yield(); | |
531 | break; | |
532 | ||
533 | /* no error? continue immediately. | |
534 | * | |
535 | * NOTE: to work better with UHCI (4K I/O buffer may | |
536 | * need 3K of TDs) it may be good to limit how many | |
537 | * URBs are queued at once; N milliseconds? | |
538 | */ | |
539 | case 0: | |
540 | ++i; | |
541 | cpu_relax(); | |
542 | break; | |
543 | ||
544 | /* fail any uncompleted urbs */ | |
545 | default: | |
546 | io->urbs[i]->status = retval; | |
547 | dev_dbg(&io->dev->dev, "%s, submit --> %d\n", | |
548 | __func__, retval); | |
549 | usb_sg_cancel(io); | |
550 | } | |
551 | spin_lock_irq(&io->lock); | |
552 | if (retval && (io->status == 0 || io->status == -ECONNRESET)) | |
553 | io->status = retval; | |
554 | } | |
555 | io->count -= entries - i; | |
556 | if (io->count == 0) | |
557 | complete(&io->complete); | |
558 | spin_unlock_irq(&io->lock); | |
559 | ||
560 | /* OK, yes, this could be packaged as non-blocking. | |
561 | * So could the submit loop above ... but it's easier to | |
562 | * solve neither problem than to solve both! | |
563 | */ | |
564 | wait_for_completion(&io->complete); | |
565 | ||
566 | sg_clean(io); | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(usb_sg_wait); | |
569 | ||
570 | /** | |
571 | * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait() | |
572 | * @io: request block, initialized with usb_sg_init() | |
573 | * | |
574 | * This stops a request after it has been started by usb_sg_wait(). | |
575 | * It can also prevents one initialized by usb_sg_init() from starting, | |
576 | * so that call just frees resources allocated to the request. | |
577 | */ | |
578 | void usb_sg_cancel(struct usb_sg_request *io) | |
579 | { | |
580 | unsigned long flags; | |
581 | int i, retval; | |
582 | ||
583 | spin_lock_irqsave(&io->lock, flags); | |
584 | if (io->status) { | |
585 | spin_unlock_irqrestore(&io->lock, flags); | |
586 | return; | |
587 | } | |
588 | /* shut everything down */ | |
589 | io->status = -ECONNRESET; | |
590 | spin_unlock_irqrestore(&io->lock, flags); | |
591 | ||
592 | for (i = io->entries - 1; i >= 0; --i) { | |
593 | usb_block_urb(io->urbs[i]); | |
594 | ||
595 | retval = usb_unlink_urb(io->urbs[i]); | |
596 | if (retval != -EINPROGRESS | |
597 | && retval != -ENODEV | |
598 | && retval != -EBUSY | |
599 | && retval != -EIDRM) | |
600 | dev_warn(&io->dev->dev, "%s, unlink --> %d\n", | |
601 | __func__, retval); | |
602 | } | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(usb_sg_cancel); | |
605 | ||
606 | /*-------------------------------------------------------------------*/ | |
607 | ||
608 | /** | |
609 | * usb_get_descriptor - issues a generic GET_DESCRIPTOR request | |
610 | * @dev: the device whose descriptor is being retrieved | |
611 | * @type: the descriptor type (USB_DT_*) | |
612 | * @index: the number of the descriptor | |
613 | * @buf: where to put the descriptor | |
614 | * @size: how big is "buf"? | |
615 | * Context: !in_interrupt () | |
616 | * | |
617 | * Gets a USB descriptor. Convenience functions exist to simplify | |
618 | * getting some types of descriptors. Use | |
619 | * usb_get_string() or usb_string() for USB_DT_STRING. | |
620 | * Device (USB_DT_DEVICE) and configuration descriptors (USB_DT_CONFIG) | |
621 | * are part of the device structure. | |
622 | * In addition to a number of USB-standard descriptors, some | |
623 | * devices also use class-specific or vendor-specific descriptors. | |
624 | * | |
625 | * This call is synchronous, and may not be used in an interrupt context. | |
626 | * | |
627 | * Return: The number of bytes received on success, or else the status code | |
628 | * returned by the underlying usb_control_msg() call. | |
629 | */ | |
630 | int usb_get_descriptor(struct usb_device *dev, unsigned char type, | |
631 | unsigned char index, void *buf, int size) | |
632 | { | |
633 | int i; | |
634 | int result; | |
635 | ||
636 | memset(buf, 0, size); /* Make sure we parse really received data */ | |
637 | ||
638 | for (i = 0; i < 3; ++i) { | |
639 | /* retry on length 0 or error; some devices are flakey */ | |
640 | result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
641 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
642 | (type << 8) + index, 0, buf, size, | |
643 | USB_CTRL_GET_TIMEOUT); | |
644 | if (result <= 0 && result != -ETIMEDOUT) | |
645 | continue; | |
646 | if (result > 1 && ((u8 *)buf)[1] != type) { | |
647 | result = -ENODATA; | |
648 | continue; | |
649 | } | |
650 | break; | |
651 | } | |
652 | return result; | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(usb_get_descriptor); | |
655 | ||
656 | /** | |
657 | * usb_get_string - gets a string descriptor | |
658 | * @dev: the device whose string descriptor is being retrieved | |
659 | * @langid: code for language chosen (from string descriptor zero) | |
660 | * @index: the number of the descriptor | |
661 | * @buf: where to put the string | |
662 | * @size: how big is "buf"? | |
663 | * Context: !in_interrupt () | |
664 | * | |
665 | * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character, | |
666 | * in little-endian byte order). | |
667 | * The usb_string() function will often be a convenient way to turn | |
668 | * these strings into kernel-printable form. | |
669 | * | |
670 | * Strings may be referenced in device, configuration, interface, or other | |
671 | * descriptors, and could also be used in vendor-specific ways. | |
672 | * | |
673 | * This call is synchronous, and may not be used in an interrupt context. | |
674 | * | |
675 | * Return: The number of bytes received on success, or else the status code | |
676 | * returned by the underlying usb_control_msg() call. | |
677 | */ | |
678 | static int usb_get_string(struct usb_device *dev, unsigned short langid, | |
679 | unsigned char index, void *buf, int size) | |
680 | { | |
681 | int i; | |
682 | int result; | |
683 | ||
684 | for (i = 0; i < 3; ++i) { | |
685 | /* retry on length 0 or stall; some devices are flakey */ | |
686 | result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
687 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
688 | (USB_DT_STRING << 8) + index, langid, buf, size, | |
689 | USB_CTRL_GET_TIMEOUT); | |
690 | if (result == 0 || result == -EPIPE) | |
691 | continue; | |
692 | if (result > 1 && ((u8 *) buf)[1] != USB_DT_STRING) { | |
693 | result = -ENODATA; | |
694 | continue; | |
695 | } | |
696 | break; | |
697 | } | |
698 | return result; | |
699 | } | |
700 | ||
701 | static void usb_try_string_workarounds(unsigned char *buf, int *length) | |
702 | { | |
703 | int newlength, oldlength = *length; | |
704 | ||
705 | for (newlength = 2; newlength + 1 < oldlength; newlength += 2) | |
706 | if (!isprint(buf[newlength]) || buf[newlength + 1]) | |
707 | break; | |
708 | ||
709 | if (newlength > 2) { | |
710 | buf[0] = newlength; | |
711 | *length = newlength; | |
712 | } | |
713 | } | |
714 | ||
715 | static int usb_string_sub(struct usb_device *dev, unsigned int langid, | |
716 | unsigned int index, unsigned char *buf) | |
717 | { | |
718 | int rc; | |
719 | ||
720 | /* Try to read the string descriptor by asking for the maximum | |
721 | * possible number of bytes */ | |
722 | if (dev->quirks & USB_QUIRK_STRING_FETCH_255) | |
723 | rc = -EIO; | |
724 | else | |
725 | rc = usb_get_string(dev, langid, index, buf, 255); | |
726 | ||
727 | /* If that failed try to read the descriptor length, then | |
728 | * ask for just that many bytes */ | |
729 | if (rc < 2) { | |
730 | rc = usb_get_string(dev, langid, index, buf, 2); | |
731 | if (rc == 2) | |
732 | rc = usb_get_string(dev, langid, index, buf, buf[0]); | |
733 | } | |
734 | ||
735 | if (rc >= 2) { | |
736 | if (!buf[0] && !buf[1]) | |
737 | usb_try_string_workarounds(buf, &rc); | |
738 | ||
739 | /* There might be extra junk at the end of the descriptor */ | |
740 | if (buf[0] < rc) | |
741 | rc = buf[0]; | |
742 | ||
743 | rc = rc - (rc & 1); /* force a multiple of two */ | |
744 | } | |
745 | ||
746 | if (rc < 2) | |
747 | rc = (rc < 0 ? rc : -EINVAL); | |
748 | ||
749 | return rc; | |
750 | } | |
751 | ||
752 | static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf) | |
753 | { | |
754 | int err; | |
755 | ||
756 | if (dev->have_langid) | |
757 | return 0; | |
758 | ||
759 | if (dev->string_langid < 0) | |
760 | return -EPIPE; | |
761 | ||
762 | err = usb_string_sub(dev, 0, 0, tbuf); | |
763 | ||
764 | /* If the string was reported but is malformed, default to english | |
765 | * (0x0409) */ | |
766 | if (err == -ENODATA || (err > 0 && err < 4)) { | |
767 | dev->string_langid = 0x0409; | |
768 | dev->have_langid = 1; | |
769 | dev_err(&dev->dev, | |
770 | "language id specifier not provided by device, defaulting to English\n"); | |
771 | return 0; | |
772 | } | |
773 | ||
774 | /* In case of all other errors, we assume the device is not able to | |
775 | * deal with strings at all. Set string_langid to -1 in order to | |
776 | * prevent any string to be retrieved from the device */ | |
777 | if (err < 0) { | |
778 | dev_err(&dev->dev, "string descriptor 0 read error: %d\n", | |
779 | err); | |
780 | dev->string_langid = -1; | |
781 | return -EPIPE; | |
782 | } | |
783 | ||
784 | /* always use the first langid listed */ | |
785 | dev->string_langid = tbuf[2] | (tbuf[3] << 8); | |
786 | dev->have_langid = 1; | |
787 | dev_dbg(&dev->dev, "default language 0x%04x\n", | |
788 | dev->string_langid); | |
789 | return 0; | |
790 | } | |
791 | ||
792 | /** | |
793 | * usb_string - returns UTF-8 version of a string descriptor | |
794 | * @dev: the device whose string descriptor is being retrieved | |
795 | * @index: the number of the descriptor | |
796 | * @buf: where to put the string | |
797 | * @size: how big is "buf"? | |
798 | * Context: !in_interrupt () | |
799 | * | |
800 | * This converts the UTF-16LE encoded strings returned by devices, from | |
801 | * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones | |
802 | * that are more usable in most kernel contexts. Note that this function | |
803 | * chooses strings in the first language supported by the device. | |
804 | * | |
805 | * This call is synchronous, and may not be used in an interrupt context. | |
806 | * | |
807 | * Return: length of the string (>= 0) or usb_control_msg status (< 0). | |
808 | */ | |
809 | int usb_string(struct usb_device *dev, int index, char *buf, size_t size) | |
810 | { | |
811 | unsigned char *tbuf; | |
812 | int err; | |
813 | ||
814 | if (dev->state == USB_STATE_SUSPENDED) | |
815 | return -EHOSTUNREACH; | |
816 | if (size <= 0 || !buf || !index) | |
817 | return -EINVAL; | |
818 | buf[0] = 0; | |
819 | tbuf = kmalloc(256, GFP_NOIO); | |
820 | if (!tbuf) | |
821 | return -ENOMEM; | |
822 | ||
823 | err = usb_get_langid(dev, tbuf); | |
824 | if (err < 0) | |
825 | goto errout; | |
826 | ||
827 | err = usb_string_sub(dev, dev->string_langid, index, tbuf); | |
828 | if (err < 0) | |
829 | goto errout; | |
830 | ||
831 | size--; /* leave room for trailing NULL char in output buffer */ | |
832 | err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2, | |
833 | UTF16_LITTLE_ENDIAN, buf, size); | |
834 | buf[err] = 0; | |
835 | ||
836 | if (tbuf[1] != USB_DT_STRING) | |
837 | dev_dbg(&dev->dev, | |
838 | "wrong descriptor type %02x for string %d (\"%s\")\n", | |
839 | tbuf[1], index, buf); | |
840 | ||
841 | errout: | |
842 | kfree(tbuf); | |
843 | return err; | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(usb_string); | |
846 | ||
847 | /* one UTF-8-encoded 16-bit character has at most three bytes */ | |
848 | #define MAX_USB_STRING_SIZE (127 * 3 + 1) | |
849 | ||
850 | /** | |
851 | * usb_cache_string - read a string descriptor and cache it for later use | |
852 | * @udev: the device whose string descriptor is being read | |
853 | * @index: the descriptor index | |
854 | * | |
855 | * Return: A pointer to a kmalloc'ed buffer containing the descriptor string, | |
856 | * or %NULL if the index is 0 or the string could not be read. | |
857 | */ | |
858 | char *usb_cache_string(struct usb_device *udev, int index) | |
859 | { | |
860 | char *buf; | |
861 | char *smallbuf = NULL; | |
862 | int len; | |
863 | ||
864 | if (index <= 0) | |
865 | return NULL; | |
866 | ||
867 | buf = kmalloc(MAX_USB_STRING_SIZE, GFP_NOIO); | |
868 | if (buf) { | |
869 | len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE); | |
870 | if (len > 0) { | |
871 | smallbuf = kmalloc(++len, GFP_NOIO); | |
872 | if (!smallbuf) | |
873 | return buf; | |
874 | memcpy(smallbuf, buf, len); | |
875 | } | |
876 | kfree(buf); | |
877 | } | |
878 | return smallbuf; | |
879 | } | |
880 | ||
881 | /* | |
882 | * usb_get_device_descriptor - (re)reads the device descriptor (usbcore) | |
883 | * @dev: the device whose device descriptor is being updated | |
884 | * @size: how much of the descriptor to read | |
885 | * Context: !in_interrupt () | |
886 | * | |
887 | * Updates the copy of the device descriptor stored in the device structure, | |
888 | * which dedicates space for this purpose. | |
889 | * | |
890 | * Not exported, only for use by the core. If drivers really want to read | |
891 | * the device descriptor directly, they can call usb_get_descriptor() with | |
892 | * type = USB_DT_DEVICE and index = 0. | |
893 | * | |
894 | * This call is synchronous, and may not be used in an interrupt context. | |
895 | * | |
896 | * Return: The number of bytes received on success, or else the status code | |
897 | * returned by the underlying usb_control_msg() call. | |
898 | */ | |
899 | int usb_get_device_descriptor(struct usb_device *dev, unsigned int size) | |
900 | { | |
901 | struct usb_device_descriptor *desc; | |
902 | int ret; | |
903 | ||
904 | if (size > sizeof(*desc)) | |
905 | return -EINVAL; | |
906 | desc = kmalloc(sizeof(*desc), GFP_NOIO); | |
907 | if (!desc) | |
908 | return -ENOMEM; | |
909 | ||
910 | ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, size); | |
911 | if (ret >= 0) | |
912 | memcpy(&dev->descriptor, desc, size); | |
913 | kfree(desc); | |
914 | return ret; | |
915 | } | |
916 | ||
917 | /** | |
918 | * usb_get_status - issues a GET_STATUS call | |
919 | * @dev: the device whose status is being checked | |
920 | * @type: USB_RECIP_*; for device, interface, or endpoint | |
921 | * @target: zero (for device), else interface or endpoint number | |
922 | * @data: pointer to two bytes of bitmap data | |
923 | * Context: !in_interrupt () | |
924 | * | |
925 | * Returns device, interface, or endpoint status. Normally only of | |
926 | * interest to see if the device is self powered, or has enabled the | |
927 | * remote wakeup facility; or whether a bulk or interrupt endpoint | |
928 | * is halted ("stalled"). | |
929 | * | |
930 | * Bits in these status bitmaps are set using the SET_FEATURE request, | |
931 | * and cleared using the CLEAR_FEATURE request. The usb_clear_halt() | |
932 | * function should be used to clear halt ("stall") status. | |
933 | * | |
934 | * This call is synchronous, and may not be used in an interrupt context. | |
935 | * | |
936 | * Returns 0 and the status value in *@data (in host byte order) on success, | |
937 | * or else the status code from the underlying usb_control_msg() call. | |
938 | */ | |
939 | int usb_get_status(struct usb_device *dev, int type, int target, void *data) | |
940 | { | |
941 | int ret; | |
942 | __le16 *status = kmalloc(sizeof(*status), GFP_KERNEL); | |
943 | ||
944 | if (!status) | |
945 | return -ENOMEM; | |
946 | ||
947 | ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
948 | USB_REQ_GET_STATUS, USB_DIR_IN | type, 0, target, status, | |
949 | sizeof(*status), USB_CTRL_GET_TIMEOUT); | |
950 | ||
951 | if (ret == 2) { | |
952 | *(u16 *) data = le16_to_cpu(*status); | |
953 | ret = 0; | |
954 | } else if (ret >= 0) { | |
955 | ret = -EIO; | |
956 | } | |
957 | kfree(status); | |
958 | return ret; | |
959 | } | |
960 | EXPORT_SYMBOL_GPL(usb_get_status); | |
961 | ||
962 | /** | |
963 | * usb_clear_halt - tells device to clear endpoint halt/stall condition | |
964 | * @dev: device whose endpoint is halted | |
965 | * @pipe: endpoint "pipe" being cleared | |
966 | * Context: !in_interrupt () | |
967 | * | |
968 | * This is used to clear halt conditions for bulk and interrupt endpoints, | |
969 | * as reported by URB completion status. Endpoints that are halted are | |
970 | * sometimes referred to as being "stalled". Such endpoints are unable | |
971 | * to transmit or receive data until the halt status is cleared. Any URBs | |
972 | * queued for such an endpoint should normally be unlinked by the driver | |
973 | * before clearing the halt condition, as described in sections 5.7.5 | |
974 | * and 5.8.5 of the USB 2.0 spec. | |
975 | * | |
976 | * Note that control and isochronous endpoints don't halt, although control | |
977 | * endpoints report "protocol stall" (for unsupported requests) using the | |
978 | * same status code used to report a true stall. | |
979 | * | |
980 | * This call is synchronous, and may not be used in an interrupt context. | |
981 | * | |
982 | * Return: Zero on success, or else the status code returned by the | |
983 | * underlying usb_control_msg() call. | |
984 | */ | |
985 | int usb_clear_halt(struct usb_device *dev, int pipe) | |
986 | { | |
987 | int result; | |
988 | int endp = usb_pipeendpoint(pipe); | |
989 | ||
990 | if (usb_pipein(pipe)) | |
991 | endp |= USB_DIR_IN; | |
992 | ||
993 | /* we don't care if it wasn't halted first. in fact some devices | |
994 | * (like some ibmcam model 1 units) seem to expect hosts to make | |
995 | * this request for iso endpoints, which can't halt! | |
996 | */ | |
997 | result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), | |
998 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, | |
999 | USB_ENDPOINT_HALT, endp, NULL, 0, | |
1000 | USB_CTRL_SET_TIMEOUT); | |
1001 | ||
1002 | /* don't un-halt or force to DATA0 except on success */ | |
1003 | if (result < 0) | |
1004 | return result; | |
1005 | ||
1006 | /* NOTE: seems like Microsoft and Apple don't bother verifying | |
1007 | * the clear "took", so some devices could lock up if you check... | |
1008 | * such as the Hagiwara FlashGate DUAL. So we won't bother. | |
1009 | * | |
1010 | * NOTE: make sure the logic here doesn't diverge much from | |
1011 | * the copy in usb-storage, for as long as we need two copies. | |
1012 | */ | |
1013 | ||
1014 | usb_reset_endpoint(dev, endp); | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | EXPORT_SYMBOL_GPL(usb_clear_halt); | |
1019 | ||
1020 | static int create_intf_ep_devs(struct usb_interface *intf) | |
1021 | { | |
1022 | struct usb_device *udev = interface_to_usbdev(intf); | |
1023 | struct usb_host_interface *alt = intf->cur_altsetting; | |
1024 | int i; | |
1025 | ||
1026 | if (intf->ep_devs_created || intf->unregistering) | |
1027 | return 0; | |
1028 | ||
1029 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) | |
1030 | (void) usb_create_ep_devs(&intf->dev, &alt->endpoint[i], udev); | |
1031 | intf->ep_devs_created = 1; | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static void remove_intf_ep_devs(struct usb_interface *intf) | |
1036 | { | |
1037 | struct usb_host_interface *alt = intf->cur_altsetting; | |
1038 | int i; | |
1039 | ||
1040 | if (!intf->ep_devs_created) | |
1041 | return; | |
1042 | ||
1043 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) | |
1044 | usb_remove_ep_devs(&alt->endpoint[i]); | |
1045 | intf->ep_devs_created = 0; | |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * usb_disable_endpoint -- Disable an endpoint by address | |
1050 | * @dev: the device whose endpoint is being disabled | |
1051 | * @epaddr: the endpoint's address. Endpoint number for output, | |
1052 | * endpoint number + USB_DIR_IN for input | |
1053 | * @reset_hardware: flag to erase any endpoint state stored in the | |
1054 | * controller hardware | |
1055 | * | |
1056 | * Disables the endpoint for URB submission and nukes all pending URBs. | |
1057 | * If @reset_hardware is set then also deallocates hcd/hardware state | |
1058 | * for the endpoint. | |
1059 | */ | |
1060 | void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr, | |
1061 | bool reset_hardware) | |
1062 | { | |
1063 | unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; | |
1064 | struct usb_host_endpoint *ep; | |
1065 | ||
1066 | if (!dev) | |
1067 | return; | |
1068 | ||
1069 | if (usb_endpoint_out(epaddr)) { | |
1070 | ep = dev->ep_out[epnum]; | |
1071 | if (reset_hardware) | |
1072 | dev->ep_out[epnum] = NULL; | |
1073 | } else { | |
1074 | ep = dev->ep_in[epnum]; | |
1075 | if (reset_hardware) | |
1076 | dev->ep_in[epnum] = NULL; | |
1077 | } | |
1078 | if (ep) { | |
1079 | ep->enabled = 0; | |
1080 | usb_hcd_flush_endpoint(dev, ep); | |
1081 | if (reset_hardware) | |
1082 | usb_hcd_disable_endpoint(dev, ep); | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * usb_reset_endpoint - Reset an endpoint's state. | |
1088 | * @dev: the device whose endpoint is to be reset | |
1089 | * @epaddr: the endpoint's address. Endpoint number for output, | |
1090 | * endpoint number + USB_DIR_IN for input | |
1091 | * | |
1092 | * Resets any host-side endpoint state such as the toggle bit, | |
1093 | * sequence number or current window. | |
1094 | */ | |
1095 | void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr) | |
1096 | { | |
1097 | unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; | |
1098 | struct usb_host_endpoint *ep; | |
1099 | ||
1100 | if (usb_endpoint_out(epaddr)) | |
1101 | ep = dev->ep_out[epnum]; | |
1102 | else | |
1103 | ep = dev->ep_in[epnum]; | |
1104 | if (ep) | |
1105 | usb_hcd_reset_endpoint(dev, ep); | |
1106 | } | |
1107 | EXPORT_SYMBOL_GPL(usb_reset_endpoint); | |
1108 | ||
1109 | ||
1110 | /** | |
1111 | * usb_disable_interface -- Disable all endpoints for an interface | |
1112 | * @dev: the device whose interface is being disabled | |
1113 | * @intf: pointer to the interface descriptor | |
1114 | * @reset_hardware: flag to erase any endpoint state stored in the | |
1115 | * controller hardware | |
1116 | * | |
1117 | * Disables all the endpoints for the interface's current altsetting. | |
1118 | */ | |
1119 | void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf, | |
1120 | bool reset_hardware) | |
1121 | { | |
1122 | struct usb_host_interface *alt = intf->cur_altsetting; | |
1123 | int i; | |
1124 | ||
1125 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) { | |
1126 | usb_disable_endpoint(dev, | |
1127 | alt->endpoint[i].desc.bEndpointAddress, | |
1128 | reset_hardware); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * usb_disable_device - Disable all the endpoints for a USB device | |
1134 | * @dev: the device whose endpoints are being disabled | |
1135 | * @skip_ep0: 0 to disable endpoint 0, 1 to skip it. | |
1136 | * | |
1137 | * Disables all the device's endpoints, potentially including endpoint 0. | |
1138 | * Deallocates hcd/hardware state for the endpoints (nuking all or most | |
1139 | * pending urbs) and usbcore state for the interfaces, so that usbcore | |
1140 | * must usb_set_configuration() before any interfaces could be used. | |
1141 | */ | |
1142 | void usb_disable_device(struct usb_device *dev, int skip_ep0) | |
1143 | { | |
1144 | int i; | |
1145 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); | |
1146 | ||
1147 | /* getting rid of interfaces will disconnect | |
1148 | * any drivers bound to them (a key side effect) | |
1149 | */ | |
1150 | if (dev->actconfig) { | |
1151 | /* | |
1152 | * FIXME: In order to avoid self-deadlock involving the | |
1153 | * bandwidth_mutex, we have to mark all the interfaces | |
1154 | * before unregistering any of them. | |
1155 | */ | |
1156 | for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) | |
1157 | dev->actconfig->interface[i]->unregistering = 1; | |
1158 | ||
1159 | for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { | |
1160 | struct usb_interface *interface; | |
1161 | ||
1162 | /* remove this interface if it has been registered */ | |
1163 | interface = dev->actconfig->interface[i]; | |
1164 | if (!device_is_registered(&interface->dev)) | |
1165 | continue; | |
1166 | dev_dbg(&dev->dev, "unregistering interface %s\n", | |
1167 | dev_name(&interface->dev)); | |
1168 | remove_intf_ep_devs(interface); | |
1169 | device_del(&interface->dev); | |
1170 | } | |
1171 | ||
1172 | /* Now that the interfaces are unbound, nobody should | |
1173 | * try to access them. | |
1174 | */ | |
1175 | for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { | |
1176 | put_device(&dev->actconfig->interface[i]->dev); | |
1177 | dev->actconfig->interface[i] = NULL; | |
1178 | } | |
1179 | ||
1180 | if (dev->usb2_hw_lpm_enabled == 1) | |
1181 | usb_set_usb2_hardware_lpm(dev, 0); | |
1182 | usb_unlocked_disable_lpm(dev); | |
1183 | usb_disable_ltm(dev); | |
1184 | ||
1185 | dev->actconfig = NULL; | |
1186 | if (dev->state == USB_STATE_CONFIGURED) | |
1187 | usb_set_device_state(dev, USB_STATE_ADDRESS); | |
1188 | } | |
1189 | ||
1190 | dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__, | |
1191 | skip_ep0 ? "non-ep0" : "all"); | |
1192 | if (hcd->driver->check_bandwidth) { | |
1193 | /* First pass: Cancel URBs, leave endpoint pointers intact. */ | |
1194 | for (i = skip_ep0; i < 16; ++i) { | |
1195 | usb_disable_endpoint(dev, i, false); | |
1196 | usb_disable_endpoint(dev, i + USB_DIR_IN, false); | |
1197 | } | |
1198 | /* Remove endpoints from the host controller internal state */ | |
1199 | mutex_lock(hcd->bandwidth_mutex); | |
1200 | usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL); | |
1201 | mutex_unlock(hcd->bandwidth_mutex); | |
1202 | /* Second pass: remove endpoint pointers */ | |
1203 | } | |
1204 | for (i = skip_ep0; i < 16; ++i) { | |
1205 | usb_disable_endpoint(dev, i, true); | |
1206 | usb_disable_endpoint(dev, i + USB_DIR_IN, true); | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | /** | |
1211 | * usb_enable_endpoint - Enable an endpoint for USB communications | |
1212 | * @dev: the device whose interface is being enabled | |
1213 | * @ep: the endpoint | |
1214 | * @reset_ep: flag to reset the endpoint state | |
1215 | * | |
1216 | * Resets the endpoint state if asked, and sets dev->ep_{in,out} pointers. | |
1217 | * For control endpoints, both the input and output sides are handled. | |
1218 | */ | |
1219 | void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep, | |
1220 | bool reset_ep) | |
1221 | { | |
1222 | int epnum = usb_endpoint_num(&ep->desc); | |
1223 | int is_out = usb_endpoint_dir_out(&ep->desc); | |
1224 | int is_control = usb_endpoint_xfer_control(&ep->desc); | |
1225 | ||
1226 | if (reset_ep) | |
1227 | usb_hcd_reset_endpoint(dev, ep); | |
1228 | if (is_out || is_control) | |
1229 | dev->ep_out[epnum] = ep; | |
1230 | if (!is_out || is_control) | |
1231 | dev->ep_in[epnum] = ep; | |
1232 | ep->enabled = 1; | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * usb_enable_interface - Enable all the endpoints for an interface | |
1237 | * @dev: the device whose interface is being enabled | |
1238 | * @intf: pointer to the interface descriptor | |
1239 | * @reset_eps: flag to reset the endpoints' state | |
1240 | * | |
1241 | * Enables all the endpoints for the interface's current altsetting. | |
1242 | */ | |
1243 | void usb_enable_interface(struct usb_device *dev, | |
1244 | struct usb_interface *intf, bool reset_eps) | |
1245 | { | |
1246 | struct usb_host_interface *alt = intf->cur_altsetting; | |
1247 | int i; | |
1248 | ||
1249 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) | |
1250 | usb_enable_endpoint(dev, &alt->endpoint[i], reset_eps); | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * usb_set_interface - Makes a particular alternate setting be current | |
1255 | * @dev: the device whose interface is being updated | |
1256 | * @interface: the interface being updated | |
1257 | * @alternate: the setting being chosen. | |
1258 | * Context: !in_interrupt () | |
1259 | * | |
1260 | * This is used to enable data transfers on interfaces that may not | |
1261 | * be enabled by default. Not all devices support such configurability. | |
1262 | * Only the driver bound to an interface may change its setting. | |
1263 | * | |
1264 | * Within any given configuration, each interface may have several | |
1265 | * alternative settings. These are often used to control levels of | |
1266 | * bandwidth consumption. For example, the default setting for a high | |
1267 | * speed interrupt endpoint may not send more than 64 bytes per microframe, | |
1268 | * while interrupt transfers of up to 3KBytes per microframe are legal. | |
1269 | * Also, isochronous endpoints may never be part of an | |
1270 | * interface's default setting. To access such bandwidth, alternate | |
1271 | * interface settings must be made current. | |
1272 | * | |
1273 | * Note that in the Linux USB subsystem, bandwidth associated with | |
1274 | * an endpoint in a given alternate setting is not reserved until an URB | |
1275 | * is submitted that needs that bandwidth. Some other operating systems | |
1276 | * allocate bandwidth early, when a configuration is chosen. | |
1277 | * | |
1278 | * This call is synchronous, and may not be used in an interrupt context. | |
1279 | * Also, drivers must not change altsettings while urbs are scheduled for | |
1280 | * endpoints in that interface; all such urbs must first be completed | |
1281 | * (perhaps forced by unlinking). | |
1282 | * | |
1283 | * Return: Zero on success, or else the status code returned by the | |
1284 | * underlying usb_control_msg() call. | |
1285 | */ | |
1286 | int usb_set_interface(struct usb_device *dev, int interface, int alternate) | |
1287 | { | |
1288 | struct usb_interface *iface; | |
1289 | struct usb_host_interface *alt; | |
1290 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); | |
1291 | int i, ret, manual = 0; | |
1292 | unsigned int epaddr; | |
1293 | unsigned int pipe; | |
1294 | ||
1295 | if (dev->state == USB_STATE_SUSPENDED) | |
1296 | return -EHOSTUNREACH; | |
1297 | ||
1298 | iface = usb_ifnum_to_if(dev, interface); | |
1299 | if (!iface) { | |
1300 | dev_dbg(&dev->dev, "selecting invalid interface %d\n", | |
1301 | interface); | |
1302 | return -EINVAL; | |
1303 | } | |
1304 | if (iface->unregistering) | |
1305 | return -ENODEV; | |
1306 | ||
1307 | alt = usb_altnum_to_altsetting(iface, alternate); | |
1308 | if (!alt) { | |
1309 | dev_warn(&dev->dev, "selecting invalid altsetting %d\n", | |
1310 | alternate); | |
1311 | return -EINVAL; | |
1312 | } | |
1313 | ||
1314 | /* Make sure we have enough bandwidth for this alternate interface. | |
1315 | * Remove the current alt setting and add the new alt setting. | |
1316 | */ | |
1317 | mutex_lock(hcd->bandwidth_mutex); | |
1318 | /* Disable LPM, and re-enable it once the new alt setting is installed, | |
1319 | * so that the xHCI driver can recalculate the U1/U2 timeouts. | |
1320 | */ | |
1321 | if (usb_disable_lpm(dev)) { | |
1322 | dev_err(&iface->dev, "%s Failed to disable LPM\n.", __func__); | |
1323 | mutex_unlock(hcd->bandwidth_mutex); | |
1324 | return -ENOMEM; | |
1325 | } | |
1326 | /* Changing alt-setting also frees any allocated streams */ | |
1327 | for (i = 0; i < iface->cur_altsetting->desc.bNumEndpoints; i++) | |
1328 | iface->cur_altsetting->endpoint[i].streams = 0; | |
1329 | ||
1330 | ret = usb_hcd_alloc_bandwidth(dev, NULL, iface->cur_altsetting, alt); | |
1331 | if (ret < 0) { | |
1332 | dev_info(&dev->dev, "Not enough bandwidth for altsetting %d\n", | |
1333 | alternate); | |
1334 | usb_enable_lpm(dev); | |
1335 | mutex_unlock(hcd->bandwidth_mutex); | |
1336 | return ret; | |
1337 | } | |
1338 | ||
1339 | if (dev->quirks & USB_QUIRK_NO_SET_INTF) | |
1340 | ret = -EPIPE; | |
1341 | else | |
1342 | ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), | |
1343 | USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, | |
1344 | alternate, interface, NULL, 0, 5000); | |
1345 | ||
1346 | /* 9.4.10 says devices don't need this and are free to STALL the | |
1347 | * request if the interface only has one alternate setting. | |
1348 | */ | |
1349 | if (ret == -EPIPE && iface->num_altsetting == 1) { | |
1350 | dev_dbg(&dev->dev, | |
1351 | "manual set_interface for iface %d, alt %d\n", | |
1352 | interface, alternate); | |
1353 | manual = 1; | |
1354 | } else if (ret < 0) { | |
1355 | /* Re-instate the old alt setting */ | |
1356 | usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting); | |
1357 | usb_enable_lpm(dev); | |
1358 | mutex_unlock(hcd->bandwidth_mutex); | |
1359 | return ret; | |
1360 | } | |
1361 | mutex_unlock(hcd->bandwidth_mutex); | |
1362 | ||
1363 | /* FIXME drivers shouldn't need to replicate/bugfix the logic here | |
1364 | * when they implement async or easily-killable versions of this or | |
1365 | * other "should-be-internal" functions (like clear_halt). | |
1366 | * should hcd+usbcore postprocess control requests? | |
1367 | */ | |
1368 | ||
1369 | /* prevent submissions using previous endpoint settings */ | |
1370 | if (iface->cur_altsetting != alt) { | |
1371 | remove_intf_ep_devs(iface); | |
1372 | usb_remove_sysfs_intf_files(iface); | |
1373 | } | |
1374 | usb_disable_interface(dev, iface, true); | |
1375 | ||
1376 | iface->cur_altsetting = alt; | |
1377 | ||
1378 | /* Now that the interface is installed, re-enable LPM. */ | |
1379 | usb_unlocked_enable_lpm(dev); | |
1380 | ||
1381 | /* If the interface only has one altsetting and the device didn't | |
1382 | * accept the request, we attempt to carry out the equivalent action | |
1383 | * by manually clearing the HALT feature for each endpoint in the | |
1384 | * new altsetting. | |
1385 | */ | |
1386 | if (manual) { | |
1387 | for (i = 0; i < alt->desc.bNumEndpoints; i++) { | |
1388 | epaddr = alt->endpoint[i].desc.bEndpointAddress; | |
1389 | pipe = __create_pipe(dev, | |
1390 | USB_ENDPOINT_NUMBER_MASK & epaddr) | | |
1391 | (usb_endpoint_out(epaddr) ? | |
1392 | USB_DIR_OUT : USB_DIR_IN); | |
1393 | ||
1394 | usb_clear_halt(dev, pipe); | |
1395 | } | |
1396 | } | |
1397 | ||
1398 | /* 9.1.1.5: reset toggles for all endpoints in the new altsetting | |
1399 | * | |
1400 | * Note: | |
1401 | * Despite EP0 is always present in all interfaces/AS, the list of | |
1402 | * endpoints from the descriptor does not contain EP0. Due to its | |
1403 | * omnipresence one might expect EP0 being considered "affected" by | |
1404 | * any SetInterface request and hence assume toggles need to be reset. | |
1405 | * However, EP0 toggles are re-synced for every individual transfer | |
1406 | * during the SETUP stage - hence EP0 toggles are "don't care" here. | |
1407 | * (Likewise, EP0 never "halts" on well designed devices.) | |
1408 | */ | |
1409 | usb_enable_interface(dev, iface, true); | |
1410 | if (device_is_registered(&iface->dev)) { | |
1411 | usb_create_sysfs_intf_files(iface); | |
1412 | create_intf_ep_devs(iface); | |
1413 | } | |
1414 | return 0; | |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(usb_set_interface); | |
1417 | ||
1418 | /** | |
1419 | * usb_reset_configuration - lightweight device reset | |
1420 | * @dev: the device whose configuration is being reset | |
1421 | * | |
1422 | * This issues a standard SET_CONFIGURATION request to the device using | |
1423 | * the current configuration. The effect is to reset most USB-related | |
1424 | * state in the device, including interface altsettings (reset to zero), | |
1425 | * endpoint halts (cleared), and endpoint state (only for bulk and interrupt | |
1426 | * endpoints). Other usbcore state is unchanged, including bindings of | |
1427 | * usb device drivers to interfaces. | |
1428 | * | |
1429 | * Because this affects multiple interfaces, avoid using this with composite | |
1430 | * (multi-interface) devices. Instead, the driver for each interface may | |
1431 | * use usb_set_interface() on the interfaces it claims. Be careful though; | |
1432 | * some devices don't support the SET_INTERFACE request, and others won't | |
1433 | * reset all the interface state (notably endpoint state). Resetting the whole | |
1434 | * configuration would affect other drivers' interfaces. | |
1435 | * | |
1436 | * The caller must own the device lock. | |
1437 | * | |
1438 | * Return: Zero on success, else a negative error code. | |
1439 | */ | |
1440 | int usb_reset_configuration(struct usb_device *dev) | |
1441 | { | |
1442 | int i, retval; | |
1443 | struct usb_host_config *config; | |
1444 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); | |
1445 | ||
1446 | if (dev->state == USB_STATE_SUSPENDED) | |
1447 | return -EHOSTUNREACH; | |
1448 | ||
1449 | /* caller must have locked the device and must own | |
1450 | * the usb bus readlock (so driver bindings are stable); | |
1451 | * calls during probe() are fine | |
1452 | */ | |
1453 | ||
1454 | for (i = 1; i < 16; ++i) { | |
1455 | usb_disable_endpoint(dev, i, true); | |
1456 | usb_disable_endpoint(dev, i + USB_DIR_IN, true); | |
1457 | } | |
1458 | ||
1459 | config = dev->actconfig; | |
1460 | retval = 0; | |
1461 | mutex_lock(hcd->bandwidth_mutex); | |
1462 | /* Disable LPM, and re-enable it once the configuration is reset, so | |
1463 | * that the xHCI driver can recalculate the U1/U2 timeouts. | |
1464 | */ | |
1465 | if (usb_disable_lpm(dev)) { | |
1466 | dev_err(&dev->dev, "%s Failed to disable LPM\n.", __func__); | |
1467 | mutex_unlock(hcd->bandwidth_mutex); | |
1468 | return -ENOMEM; | |
1469 | } | |
1470 | /* Make sure we have enough bandwidth for each alternate setting 0 */ | |
1471 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
1472 | struct usb_interface *intf = config->interface[i]; | |
1473 | struct usb_host_interface *alt; | |
1474 | ||
1475 | alt = usb_altnum_to_altsetting(intf, 0); | |
1476 | if (!alt) | |
1477 | alt = &intf->altsetting[0]; | |
1478 | if (alt != intf->cur_altsetting) | |
1479 | retval = usb_hcd_alloc_bandwidth(dev, NULL, | |
1480 | intf->cur_altsetting, alt); | |
1481 | if (retval < 0) | |
1482 | break; | |
1483 | } | |
1484 | /* If not, reinstate the old alternate settings */ | |
1485 | if (retval < 0) { | |
1486 | reset_old_alts: | |
1487 | for (i--; i >= 0; i--) { | |
1488 | struct usb_interface *intf = config->interface[i]; | |
1489 | struct usb_host_interface *alt; | |
1490 | ||
1491 | alt = usb_altnum_to_altsetting(intf, 0); | |
1492 | if (!alt) | |
1493 | alt = &intf->altsetting[0]; | |
1494 | if (alt != intf->cur_altsetting) | |
1495 | usb_hcd_alloc_bandwidth(dev, NULL, | |
1496 | alt, intf->cur_altsetting); | |
1497 | } | |
1498 | usb_enable_lpm(dev); | |
1499 | mutex_unlock(hcd->bandwidth_mutex); | |
1500 | return retval; | |
1501 | } | |
1502 | retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), | |
1503 | USB_REQ_SET_CONFIGURATION, 0, | |
1504 | config->desc.bConfigurationValue, 0, | |
1505 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1506 | if (retval < 0) | |
1507 | goto reset_old_alts; | |
1508 | mutex_unlock(hcd->bandwidth_mutex); | |
1509 | ||
1510 | /* re-init hc/hcd interface/endpoint state */ | |
1511 | for (i = 0; i < config->desc.bNumInterfaces; i++) { | |
1512 | struct usb_interface *intf = config->interface[i]; | |
1513 | struct usb_host_interface *alt; | |
1514 | ||
1515 | alt = usb_altnum_to_altsetting(intf, 0); | |
1516 | ||
1517 | /* No altsetting 0? We'll assume the first altsetting. | |
1518 | * We could use a GetInterface call, but if a device is | |
1519 | * so non-compliant that it doesn't have altsetting 0 | |
1520 | * then I wouldn't trust its reply anyway. | |
1521 | */ | |
1522 | if (!alt) | |
1523 | alt = &intf->altsetting[0]; | |
1524 | ||
1525 | if (alt != intf->cur_altsetting) { | |
1526 | remove_intf_ep_devs(intf); | |
1527 | usb_remove_sysfs_intf_files(intf); | |
1528 | } | |
1529 | intf->cur_altsetting = alt; | |
1530 | usb_enable_interface(dev, intf, true); | |
1531 | if (device_is_registered(&intf->dev)) { | |
1532 | usb_create_sysfs_intf_files(intf); | |
1533 | create_intf_ep_devs(intf); | |
1534 | } | |
1535 | } | |
1536 | /* Now that the interfaces are installed, re-enable LPM. */ | |
1537 | usb_unlocked_enable_lpm(dev); | |
1538 | return 0; | |
1539 | } | |
1540 | EXPORT_SYMBOL_GPL(usb_reset_configuration); | |
1541 | ||
1542 | static void usb_release_interface(struct device *dev) | |
1543 | { | |
1544 | struct usb_interface *intf = to_usb_interface(dev); | |
1545 | struct usb_interface_cache *intfc = | |
1546 | altsetting_to_usb_interface_cache(intf->altsetting); | |
1547 | ||
1548 | kref_put(&intfc->ref, usb_release_interface_cache); | |
1549 | usb_put_dev(interface_to_usbdev(intf)); | |
1550 | kfree(intf); | |
1551 | } | |
1552 | ||
1553 | /* | |
1554 | * usb_deauthorize_interface - deauthorize an USB interface | |
1555 | * | |
1556 | * @intf: USB interface structure | |
1557 | */ | |
1558 | void usb_deauthorize_interface(struct usb_interface *intf) | |
1559 | { | |
1560 | struct device *dev = &intf->dev; | |
1561 | ||
1562 | device_lock(dev->parent); | |
1563 | ||
1564 | if (intf->authorized) { | |
1565 | device_lock(dev); | |
1566 | intf->authorized = 0; | |
1567 | device_unlock(dev); | |
1568 | ||
1569 | usb_forced_unbind_intf(intf); | |
1570 | } | |
1571 | ||
1572 | device_unlock(dev->parent); | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * usb_authorize_interface - authorize an USB interface | |
1577 | * | |
1578 | * @intf: USB interface structure | |
1579 | */ | |
1580 | void usb_authorize_interface(struct usb_interface *intf) | |
1581 | { | |
1582 | struct device *dev = &intf->dev; | |
1583 | ||
1584 | if (!intf->authorized) { | |
1585 | device_lock(dev); | |
1586 | intf->authorized = 1; /* authorize interface */ | |
1587 | device_unlock(dev); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1592 | { | |
1593 | struct usb_device *usb_dev; | |
1594 | struct usb_interface *intf; | |
1595 | struct usb_host_interface *alt; | |
1596 | ||
1597 | intf = to_usb_interface(dev); | |
1598 | usb_dev = interface_to_usbdev(intf); | |
1599 | alt = intf->cur_altsetting; | |
1600 | ||
1601 | if (add_uevent_var(env, "INTERFACE=%d/%d/%d", | |
1602 | alt->desc.bInterfaceClass, | |
1603 | alt->desc.bInterfaceSubClass, | |
1604 | alt->desc.bInterfaceProtocol)) | |
1605 | return -ENOMEM; | |
1606 | ||
1607 | if (add_uevent_var(env, | |
1608 | "MODALIAS=usb:" | |
1609 | "v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02Xin%02X", | |
1610 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
1611 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
1612 | le16_to_cpu(usb_dev->descriptor.bcdDevice), | |
1613 | usb_dev->descriptor.bDeviceClass, | |
1614 | usb_dev->descriptor.bDeviceSubClass, | |
1615 | usb_dev->descriptor.bDeviceProtocol, | |
1616 | alt->desc.bInterfaceClass, | |
1617 | alt->desc.bInterfaceSubClass, | |
1618 | alt->desc.bInterfaceProtocol, | |
1619 | alt->desc.bInterfaceNumber)) | |
1620 | return -ENOMEM; | |
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | struct device_type usb_if_device_type = { | |
1626 | .name = "usb_interface", | |
1627 | .release = usb_release_interface, | |
1628 | .uevent = usb_if_uevent, | |
1629 | }; | |
1630 | ||
1631 | static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, | |
1632 | struct usb_host_config *config, | |
1633 | u8 inum) | |
1634 | { | |
1635 | struct usb_interface_assoc_descriptor *retval = NULL; | |
1636 | struct usb_interface_assoc_descriptor *intf_assoc; | |
1637 | int first_intf; | |
1638 | int last_intf; | |
1639 | int i; | |
1640 | ||
1641 | for (i = 0; (i < USB_MAXIADS && config->intf_assoc[i]); i++) { | |
1642 | intf_assoc = config->intf_assoc[i]; | |
1643 | if (intf_assoc->bInterfaceCount == 0) | |
1644 | continue; | |
1645 | ||
1646 | first_intf = intf_assoc->bFirstInterface; | |
1647 | last_intf = first_intf + (intf_assoc->bInterfaceCount - 1); | |
1648 | if (inum >= first_intf && inum <= last_intf) { | |
1649 | if (!retval) | |
1650 | retval = intf_assoc; | |
1651 | else | |
1652 | dev_err(&dev->dev, "Interface #%d referenced" | |
1653 | " by multiple IADs\n", inum); | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | return retval; | |
1658 | } | |
1659 | ||
1660 | ||
1661 | /* | |
1662 | * Internal function to queue a device reset | |
1663 | * See usb_queue_reset_device() for more details | |
1664 | */ | |
1665 | static void __usb_queue_reset_device(struct work_struct *ws) | |
1666 | { | |
1667 | int rc; | |
1668 | struct usb_interface *iface = | |
1669 | container_of(ws, struct usb_interface, reset_ws); | |
1670 | struct usb_device *udev = interface_to_usbdev(iface); | |
1671 | ||
1672 | rc = usb_lock_device_for_reset(udev, iface); | |
1673 | if (rc >= 0) { | |
1674 | usb_reset_device(udev); | |
1675 | usb_unlock_device(udev); | |
1676 | } | |
1677 | usb_put_intf(iface); /* Undo _get_ in usb_queue_reset_device() */ | |
1678 | } | |
1679 | ||
1680 | ||
1681 | /* | |
1682 | * usb_set_configuration - Makes a particular device setting be current | |
1683 | * @dev: the device whose configuration is being updated | |
1684 | * @configuration: the configuration being chosen. | |
1685 | * Context: !in_interrupt(), caller owns the device lock | |
1686 | * | |
1687 | * This is used to enable non-default device modes. Not all devices | |
1688 | * use this kind of configurability; many devices only have one | |
1689 | * configuration. | |
1690 | * | |
1691 | * @configuration is the value of the configuration to be installed. | |
1692 | * According to the USB spec (e.g. section 9.1.1.5), configuration values | |
1693 | * must be non-zero; a value of zero indicates that the device in | |
1694 | * unconfigured. However some devices erroneously use 0 as one of their | |
1695 | * configuration values. To help manage such devices, this routine will | |
1696 | * accept @configuration = -1 as indicating the device should be put in | |
1697 | * an unconfigured state. | |
1698 | * | |
1699 | * USB device configurations may affect Linux interoperability, | |
1700 | * power consumption and the functionality available. For example, | |
1701 | * the default configuration is limited to using 100mA of bus power, | |
1702 | * so that when certain device functionality requires more power, | |
1703 | * and the device is bus powered, that functionality should be in some | |
1704 | * non-default device configuration. Other device modes may also be | |
1705 | * reflected as configuration options, such as whether two ISDN | |
1706 | * channels are available independently; and choosing between open | |
1707 | * standard device protocols (like CDC) or proprietary ones. | |
1708 | * | |
1709 | * Note that a non-authorized device (dev->authorized == 0) will only | |
1710 | * be put in unconfigured mode. | |
1711 | * | |
1712 | * Note that USB has an additional level of device configurability, | |
1713 | * associated with interfaces. That configurability is accessed using | |
1714 | * usb_set_interface(). | |
1715 | * | |
1716 | * This call is synchronous. The calling context must be able to sleep, | |
1717 | * must own the device lock, and must not hold the driver model's USB | |
1718 | * bus mutex; usb interface driver probe() methods cannot use this routine. | |
1719 | * | |
1720 | * Returns zero on success, or else the status code returned by the | |
1721 | * underlying call that failed. On successful completion, each interface | |
1722 | * in the original device configuration has been destroyed, and each one | |
1723 | * in the new configuration has been probed by all relevant usb device | |
1724 | * drivers currently known to the kernel. | |
1725 | */ | |
1726 | int usb_set_configuration(struct usb_device *dev, int configuration) | |
1727 | { | |
1728 | int i, ret; | |
1729 | struct usb_host_config *cp = NULL; | |
1730 | struct usb_interface **new_interfaces = NULL; | |
1731 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); | |
1732 | int n, nintf; | |
1733 | ||
1734 | if (dev->authorized == 0 || configuration == -1) | |
1735 | configuration = 0; | |
1736 | else { | |
1737 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { | |
1738 | if (dev->config[i].desc.bConfigurationValue == | |
1739 | configuration) { | |
1740 | cp = &dev->config[i]; | |
1741 | break; | |
1742 | } | |
1743 | } | |
1744 | } | |
1745 | if ((!cp && configuration != 0)) | |
1746 | return -EINVAL; | |
1747 | ||
1748 | /* The USB spec says configuration 0 means unconfigured. | |
1749 | * But if a device includes a configuration numbered 0, | |
1750 | * we will accept it as a correctly configured state. | |
1751 | * Use -1 if you really want to unconfigure the device. | |
1752 | */ | |
1753 | if (cp && configuration == 0) | |
1754 | dev_warn(&dev->dev, "config 0 descriptor??\n"); | |
1755 | ||
1756 | /* Allocate memory for new interfaces before doing anything else, | |
1757 | * so that if we run out then nothing will have changed. */ | |
1758 | n = nintf = 0; | |
1759 | if (cp) { | |
1760 | nintf = cp->desc.bNumInterfaces; | |
1761 | new_interfaces = kmalloc(nintf * sizeof(*new_interfaces), | |
1762 | GFP_NOIO); | |
1763 | if (!new_interfaces) | |
1764 | return -ENOMEM; | |
1765 | ||
1766 | for (; n < nintf; ++n) { | |
1767 | new_interfaces[n] = kzalloc( | |
1768 | sizeof(struct usb_interface), | |
1769 | GFP_NOIO); | |
1770 | if (!new_interfaces[n]) { | |
1771 | ret = -ENOMEM; | |
1772 | free_interfaces: | |
1773 | while (--n >= 0) | |
1774 | kfree(new_interfaces[n]); | |
1775 | kfree(new_interfaces); | |
1776 | return ret; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | i = dev->bus_mA - usb_get_max_power(dev, cp); | |
1781 | if (i < 0) | |
1782 | dev_warn(&dev->dev, "new config #%d exceeds power " | |
1783 | "limit by %dmA\n", | |
1784 | configuration, -i); | |
1785 | } | |
1786 | ||
1787 | /* Wake up the device so we can send it the Set-Config request */ | |
1788 | ret = usb_autoresume_device(dev); | |
1789 | if (ret) | |
1790 | goto free_interfaces; | |
1791 | ||
1792 | /* if it's already configured, clear out old state first. | |
1793 | * getting rid of old interfaces means unbinding their drivers. | |
1794 | */ | |
1795 | if (dev->state != USB_STATE_ADDRESS) | |
1796 | usb_disable_device(dev, 1); /* Skip ep0 */ | |
1797 | ||
1798 | /* Get rid of pending async Set-Config requests for this device */ | |
1799 | cancel_async_set_config(dev); | |
1800 | ||
1801 | /* Make sure we have bandwidth (and available HCD resources) for this | |
1802 | * configuration. Remove endpoints from the schedule if we're dropping | |
1803 | * this configuration to set configuration 0. After this point, the | |
1804 | * host controller will not allow submissions to dropped endpoints. If | |
1805 | * this call fails, the device state is unchanged. | |
1806 | */ | |
1807 | mutex_lock(hcd->bandwidth_mutex); | |
1808 | /* Disable LPM, and re-enable it once the new configuration is | |
1809 | * installed, so that the xHCI driver can recalculate the U1/U2 | |
1810 | * timeouts. | |
1811 | */ | |
1812 | if (dev->actconfig && usb_disable_lpm(dev)) { | |
1813 | dev_err(&dev->dev, "%s Failed to disable LPM\n.", __func__); | |
1814 | mutex_unlock(hcd->bandwidth_mutex); | |
1815 | ret = -ENOMEM; | |
1816 | goto free_interfaces; | |
1817 | } | |
1818 | ret = usb_hcd_alloc_bandwidth(dev, cp, NULL, NULL); | |
1819 | if (ret < 0) { | |
1820 | if (dev->actconfig) | |
1821 | usb_enable_lpm(dev); | |
1822 | mutex_unlock(hcd->bandwidth_mutex); | |
1823 | usb_autosuspend_device(dev); | |
1824 | goto free_interfaces; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Initialize the new interface structures and the | |
1829 | * hc/hcd/usbcore interface/endpoint state. | |
1830 | */ | |
1831 | for (i = 0; i < nintf; ++i) { | |
1832 | struct usb_interface_cache *intfc; | |
1833 | struct usb_interface *intf; | |
1834 | struct usb_host_interface *alt; | |
1835 | ||
1836 | cp->interface[i] = intf = new_interfaces[i]; | |
1837 | intfc = cp->intf_cache[i]; | |
1838 | intf->altsetting = intfc->altsetting; | |
1839 | intf->num_altsetting = intfc->num_altsetting; | |
1840 | intf->authorized = !!HCD_INTF_AUTHORIZED(hcd); | |
1841 | kref_get(&intfc->ref); | |
1842 | ||
1843 | alt = usb_altnum_to_altsetting(intf, 0); | |
1844 | ||
1845 | /* No altsetting 0? We'll assume the first altsetting. | |
1846 | * We could use a GetInterface call, but if a device is | |
1847 | * so non-compliant that it doesn't have altsetting 0 | |
1848 | * then I wouldn't trust its reply anyway. | |
1849 | */ | |
1850 | if (!alt) | |
1851 | alt = &intf->altsetting[0]; | |
1852 | ||
1853 | intf->intf_assoc = | |
1854 | find_iad(dev, cp, alt->desc.bInterfaceNumber); | |
1855 | intf->cur_altsetting = alt; | |
1856 | usb_enable_interface(dev, intf, true); | |
1857 | intf->dev.parent = &dev->dev; | |
1858 | intf->dev.driver = NULL; | |
1859 | intf->dev.bus = &usb_bus_type; | |
1860 | intf->dev.type = &usb_if_device_type; | |
1861 | intf->dev.groups = usb_interface_groups; | |
1862 | intf->dev.dma_mask = dev->dev.dma_mask; | |
1863 | INIT_WORK(&intf->reset_ws, __usb_queue_reset_device); | |
1864 | intf->minor = -1; | |
1865 | device_initialize(&intf->dev); | |
1866 | pm_runtime_no_callbacks(&intf->dev); | |
1867 | dev_set_name(&intf->dev, "%d-%s:%d.%d", | |
1868 | dev->bus->busnum, dev->devpath, | |
1869 | configuration, alt->desc.bInterfaceNumber); | |
1870 | usb_get_dev(dev); | |
1871 | } | |
1872 | kfree(new_interfaces); | |
1873 | ||
1874 | ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), | |
1875 | USB_REQ_SET_CONFIGURATION, 0, configuration, 0, | |
1876 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1877 | if (ret < 0 && cp) { | |
1878 | /* | |
1879 | * All the old state is gone, so what else can we do? | |
1880 | * The device is probably useless now anyway. | |
1881 | */ | |
1882 | usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL); | |
1883 | for (i = 0; i < nintf; ++i) { | |
1884 | usb_disable_interface(dev, cp->interface[i], true); | |
1885 | put_device(&cp->interface[i]->dev); | |
1886 | cp->interface[i] = NULL; | |
1887 | } | |
1888 | cp = NULL; | |
1889 | } | |
1890 | ||
1891 | dev->actconfig = cp; | |
1892 | mutex_unlock(hcd->bandwidth_mutex); | |
1893 | ||
1894 | if (!cp) { | |
1895 | usb_set_device_state(dev, USB_STATE_ADDRESS); | |
1896 | ||
1897 | /* Leave LPM disabled while the device is unconfigured. */ | |
1898 | usb_autosuspend_device(dev); | |
1899 | return ret; | |
1900 | } | |
1901 | usb_set_device_state(dev, USB_STATE_CONFIGURED); | |
1902 | ||
1903 | if (cp->string == NULL && | |
1904 | !(dev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) | |
1905 | cp->string = usb_cache_string(dev, cp->desc.iConfiguration); | |
1906 | ||
1907 | /* Now that the interfaces are installed, re-enable LPM. */ | |
1908 | usb_unlocked_enable_lpm(dev); | |
1909 | /* Enable LTM if it was turned off by usb_disable_device. */ | |
1910 | usb_enable_ltm(dev); | |
1911 | ||
1912 | /* Now that all the interfaces are set up, register them | |
1913 | * to trigger binding of drivers to interfaces. probe() | |
1914 | * routines may install different altsettings and may | |
1915 | * claim() any interfaces not yet bound. Many class drivers | |
1916 | * need that: CDC, audio, video, etc. | |
1917 | */ | |
1918 | for (i = 0; i < nintf; ++i) { | |
1919 | struct usb_interface *intf = cp->interface[i]; | |
1920 | ||
1921 | dev_dbg(&dev->dev, | |
1922 | "adding %s (config #%d, interface %d)\n", | |
1923 | dev_name(&intf->dev), configuration, | |
1924 | intf->cur_altsetting->desc.bInterfaceNumber); | |
1925 | device_enable_async_suspend(&intf->dev); | |
1926 | ret = device_add(&intf->dev); | |
1927 | if (ret != 0) { | |
1928 | dev_err(&dev->dev, "device_add(%s) --> %d\n", | |
1929 | dev_name(&intf->dev), ret); | |
1930 | continue; | |
1931 | } | |
1932 | create_intf_ep_devs(intf); | |
1933 | } | |
1934 | ||
1935 | usb_autosuspend_device(dev); | |
1936 | return 0; | |
1937 | } | |
1938 | EXPORT_SYMBOL_GPL(usb_set_configuration); | |
1939 | ||
1940 | static LIST_HEAD(set_config_list); | |
1941 | static DEFINE_SPINLOCK(set_config_lock); | |
1942 | ||
1943 | struct set_config_request { | |
1944 | struct usb_device *udev; | |
1945 | int config; | |
1946 | struct work_struct work; | |
1947 | struct list_head node; | |
1948 | }; | |
1949 | ||
1950 | /* Worker routine for usb_driver_set_configuration() */ | |
1951 | static void driver_set_config_work(struct work_struct *work) | |
1952 | { | |
1953 | struct set_config_request *req = | |
1954 | container_of(work, struct set_config_request, work); | |
1955 | struct usb_device *udev = req->udev; | |
1956 | ||
1957 | usb_lock_device(udev); | |
1958 | spin_lock(&set_config_lock); | |
1959 | list_del(&req->node); | |
1960 | spin_unlock(&set_config_lock); | |
1961 | ||
1962 | if (req->config >= -1) /* Is req still valid? */ | |
1963 | usb_set_configuration(udev, req->config); | |
1964 | usb_unlock_device(udev); | |
1965 | usb_put_dev(udev); | |
1966 | kfree(req); | |
1967 | } | |
1968 | ||
1969 | /* Cancel pending Set-Config requests for a device whose configuration | |
1970 | * was just changed | |
1971 | */ | |
1972 | static void cancel_async_set_config(struct usb_device *udev) | |
1973 | { | |
1974 | struct set_config_request *req; | |
1975 | ||
1976 | spin_lock(&set_config_lock); | |
1977 | list_for_each_entry(req, &set_config_list, node) { | |
1978 | if (req->udev == udev) | |
1979 | req->config = -999; /* Mark as cancelled */ | |
1980 | } | |
1981 | spin_unlock(&set_config_lock); | |
1982 | } | |
1983 | ||
1984 | /** | |
1985 | * usb_driver_set_configuration - Provide a way for drivers to change device configurations | |
1986 | * @udev: the device whose configuration is being updated | |
1987 | * @config: the configuration being chosen. | |
1988 | * Context: In process context, must be able to sleep | |
1989 | * | |
1990 | * Device interface drivers are not allowed to change device configurations. | |
1991 | * This is because changing configurations will destroy the interface the | |
1992 | * driver is bound to and create new ones; it would be like a floppy-disk | |
1993 | * driver telling the computer to replace the floppy-disk drive with a | |
1994 | * tape drive! | |
1995 | * | |
1996 | * Still, in certain specialized circumstances the need may arise. This | |
1997 | * routine gets around the normal restrictions by using a work thread to | |
1998 | * submit the change-config request. | |
1999 | * | |
2000 | * Return: 0 if the request was successfully queued, error code otherwise. | |
2001 | * The caller has no way to know whether the queued request will eventually | |
2002 | * succeed. | |
2003 | */ | |
2004 | int usb_driver_set_configuration(struct usb_device *udev, int config) | |
2005 | { | |
2006 | struct set_config_request *req; | |
2007 | ||
2008 | req = kmalloc(sizeof(*req), GFP_KERNEL); | |
2009 | if (!req) | |
2010 | return -ENOMEM; | |
2011 | req->udev = udev; | |
2012 | req->config = config; | |
2013 | INIT_WORK(&req->work, driver_set_config_work); | |
2014 | ||
2015 | spin_lock(&set_config_lock); | |
2016 | list_add(&req->node, &set_config_list); | |
2017 | spin_unlock(&set_config_lock); | |
2018 | ||
2019 | usb_get_dev(udev); | |
2020 | schedule_work(&req->work); | |
2021 | return 0; | |
2022 | } | |
2023 | EXPORT_SYMBOL_GPL(usb_driver_set_configuration); | |
2024 | ||
2025 | /** | |
2026 | * cdc_parse_cdc_header - parse the extra headers present in CDC devices | |
2027 | * @hdr: the place to put the results of the parsing | |
2028 | * @intf: the interface for which parsing is requested | |
2029 | * @buffer: pointer to the extra headers to be parsed | |
2030 | * @buflen: length of the extra headers | |
2031 | * | |
2032 | * This evaluates the extra headers present in CDC devices which | |
2033 | * bind the interfaces for data and control and provide details | |
2034 | * about the capabilities of the device. | |
2035 | * | |
2036 | * Return: number of descriptors parsed or -EINVAL | |
2037 | * if the header is contradictory beyond salvage | |
2038 | */ | |
2039 | ||
2040 | int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr, | |
2041 | struct usb_interface *intf, | |
2042 | u8 *buffer, | |
2043 | int buflen) | |
2044 | { | |
2045 | /* duplicates are ignored */ | |
2046 | struct usb_cdc_union_desc *union_header = NULL; | |
2047 | ||
2048 | /* duplicates are not tolerated */ | |
2049 | struct usb_cdc_header_desc *header = NULL; | |
2050 | struct usb_cdc_ether_desc *ether = NULL; | |
2051 | struct usb_cdc_mdlm_detail_desc *detail = NULL; | |
2052 | struct usb_cdc_mdlm_desc *desc = NULL; | |
2053 | ||
2054 | unsigned int elength; | |
2055 | int cnt = 0; | |
2056 | ||
2057 | memset(hdr, 0x00, sizeof(struct usb_cdc_parsed_header)); | |
2058 | hdr->phonet_magic_present = false; | |
2059 | while (buflen > 0) { | |
2060 | elength = buffer[0]; | |
2061 | if (!elength) { | |
2062 | dev_err(&intf->dev, "skipping garbage byte\n"); | |
2063 | elength = 1; | |
2064 | goto next_desc; | |
2065 | } | |
2066 | if (buffer[1] != USB_DT_CS_INTERFACE) { | |
2067 | dev_err(&intf->dev, "skipping garbage\n"); | |
2068 | goto next_desc; | |
2069 | } | |
2070 | ||
2071 | switch (buffer[2]) { | |
2072 | case USB_CDC_UNION_TYPE: /* we've found it */ | |
2073 | if (elength < sizeof(struct usb_cdc_union_desc)) | |
2074 | goto next_desc; | |
2075 | if (union_header) { | |
2076 | dev_err(&intf->dev, "More than one union descriptor, skipping ...\n"); | |
2077 | goto next_desc; | |
2078 | } | |
2079 | union_header = (struct usb_cdc_union_desc *)buffer; | |
2080 | break; | |
2081 | case USB_CDC_COUNTRY_TYPE: | |
2082 | if (elength < sizeof(struct usb_cdc_country_functional_desc)) | |
2083 | goto next_desc; | |
2084 | hdr->usb_cdc_country_functional_desc = | |
2085 | (struct usb_cdc_country_functional_desc *)buffer; | |
2086 | break; | |
2087 | case USB_CDC_HEADER_TYPE: | |
2088 | if (elength != sizeof(struct usb_cdc_header_desc)) | |
2089 | goto next_desc; | |
2090 | if (header) | |
2091 | return -EINVAL; | |
2092 | header = (struct usb_cdc_header_desc *)buffer; | |
2093 | break; | |
2094 | case USB_CDC_ACM_TYPE: | |
2095 | if (elength < sizeof(struct usb_cdc_acm_descriptor)) | |
2096 | goto next_desc; | |
2097 | hdr->usb_cdc_acm_descriptor = | |
2098 | (struct usb_cdc_acm_descriptor *)buffer; | |
2099 | break; | |
2100 | case USB_CDC_ETHERNET_TYPE: | |
2101 | if (elength != sizeof(struct usb_cdc_ether_desc)) | |
2102 | goto next_desc; | |
2103 | if (ether) | |
2104 | return -EINVAL; | |
2105 | ether = (struct usb_cdc_ether_desc *)buffer; | |
2106 | break; | |
2107 | case USB_CDC_CALL_MANAGEMENT_TYPE: | |
2108 | if (elength < sizeof(struct usb_cdc_call_mgmt_descriptor)) | |
2109 | goto next_desc; | |
2110 | hdr->usb_cdc_call_mgmt_descriptor = | |
2111 | (struct usb_cdc_call_mgmt_descriptor *)buffer; | |
2112 | break; | |
2113 | case USB_CDC_DMM_TYPE: | |
2114 | if (elength < sizeof(struct usb_cdc_dmm_desc)) | |
2115 | goto next_desc; | |
2116 | hdr->usb_cdc_dmm_desc = | |
2117 | (struct usb_cdc_dmm_desc *)buffer; | |
2118 | break; | |
2119 | case USB_CDC_MDLM_TYPE: | |
2120 | if (elength < sizeof(struct usb_cdc_mdlm_desc *)) | |
2121 | goto next_desc; | |
2122 | if (desc) | |
2123 | return -EINVAL; | |
2124 | desc = (struct usb_cdc_mdlm_desc *)buffer; | |
2125 | break; | |
2126 | case USB_CDC_MDLM_DETAIL_TYPE: | |
2127 | if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *)) | |
2128 | goto next_desc; | |
2129 | if (detail) | |
2130 | return -EINVAL; | |
2131 | detail = (struct usb_cdc_mdlm_detail_desc *)buffer; | |
2132 | break; | |
2133 | case USB_CDC_NCM_TYPE: | |
2134 | if (elength < sizeof(struct usb_cdc_ncm_desc)) | |
2135 | goto next_desc; | |
2136 | hdr->usb_cdc_ncm_desc = (struct usb_cdc_ncm_desc *)buffer; | |
2137 | break; | |
2138 | case USB_CDC_MBIM_TYPE: | |
2139 | if (elength < sizeof(struct usb_cdc_mbim_desc)) | |
2140 | goto next_desc; | |
2141 | ||
2142 | hdr->usb_cdc_mbim_desc = (struct usb_cdc_mbim_desc *)buffer; | |
2143 | break; | |
2144 | case USB_CDC_MBIM_EXTENDED_TYPE: | |
2145 | if (elength < sizeof(struct usb_cdc_mbim_extended_desc)) | |
2146 | break; | |
2147 | hdr->usb_cdc_mbim_extended_desc = | |
2148 | (struct usb_cdc_mbim_extended_desc *)buffer; | |
2149 | break; | |
2150 | case CDC_PHONET_MAGIC_NUMBER: | |
2151 | hdr->phonet_magic_present = true; | |
2152 | break; | |
2153 | default: | |
2154 | /* | |
2155 | * there are LOTS more CDC descriptors that | |
2156 | * could legitimately be found here. | |
2157 | */ | |
2158 | dev_dbg(&intf->dev, "Ignoring descriptor: type %02x, length %ud\n", | |
2159 | buffer[2], elength); | |
2160 | goto next_desc; | |
2161 | } | |
2162 | cnt++; | |
2163 | next_desc: | |
2164 | buflen -= elength; | |
2165 | buffer += elength; | |
2166 | } | |
2167 | hdr->usb_cdc_union_desc = union_header; | |
2168 | hdr->usb_cdc_header_desc = header; | |
2169 | hdr->usb_cdc_mdlm_detail_desc = detail; | |
2170 | hdr->usb_cdc_mdlm_desc = desc; | |
2171 | hdr->usb_cdc_ether_desc = ether; | |
2172 | return cnt; | |
2173 | } | |
2174 | ||
2175 | EXPORT_SYMBOL(cdc_parse_cdc_header); |