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19#include <linux/usb.h>
20
21#include "usb_stream.h"
22
23
24
25
26static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk)
27{
28 struct usb_stream *s = sk->s;
29 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn;
30 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size;
31}
32
33static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
34{
35 struct usb_stream *s = sk->s;
36 int pack, lb = 0;
37
38 for (pack = 0; pack < sk->n_o_ps; pack++) {
39 int l = usb_stream_next_packet_size(sk);
40 if (s->idle_outsize + lb + l > s->period_size)
41 goto check;
42
43 sk->out_phase = sk->out_phase_peeked;
44 urb->iso_frame_desc[pack].offset = lb;
45 urb->iso_frame_desc[pack].length = l;
46 lb += l;
47 }
48 snd_printdd(KERN_DEBUG "%i\n", lb);
49
50check:
51 urb->number_of_packets = pack;
52 urb->transfer_buffer_length = lb;
53 s->idle_outsize += lb - s->period_size;
54 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize,
55 lb, s->period_size);
56}
57
58static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
59 struct urb **urbs, char *transfer,
60 struct usb_device *dev, int pipe)
61{
62 int u, p;
63 int maxpacket = use_packsize ?
64 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe));
65 int transfer_length = maxpacket * sk->n_o_ps;
66
67 for (u = 0; u < USB_STREAM_NURBS;
68 ++u, transfer += transfer_length) {
69 struct urb *urb = urbs[u];
70 struct usb_iso_packet_descriptor *desc;
71 urb->transfer_flags = URB_ISO_ASAP;
72 urb->transfer_buffer = transfer;
73 urb->dev = dev;
74 urb->pipe = pipe;
75 urb->number_of_packets = sk->n_o_ps;
76 urb->context = sk;
77 urb->interval = 1;
78 if (usb_pipeout(pipe))
79 continue;
80
81 urb->transfer_buffer_length = transfer_length;
82 desc = urb->iso_frame_desc;
83 desc->offset = 0;
84 desc->length = maxpacket;
85 for (p = 1; p < sk->n_o_ps; ++p) {
86 desc[p].offset = desc[p - 1].offset + maxpacket;
87 desc[p].length = maxpacket;
88 }
89 }
90}
91
92static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
93 struct usb_device *dev, int in_pipe, int out_pipe)
94{
95 struct usb_stream *s = sk->s;
96 char *indata = (char *)s + sizeof(*s) +
97 sizeof(struct usb_stream_packet) *
98 s->inpackets;
99 int u;
100
101 for (u = 0; u < USB_STREAM_NURBS; ++u) {
102 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
103 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
104 }
105
106 init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
107 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
108 out_pipe);
109}
110
111
112
113
114
115
116static inline unsigned get_usb_full_speed_rate(unsigned rate)
117{
118 return ((rate << 13) + 62) / 125;
119}
120
121
122
123
124
125static inline unsigned get_usb_high_speed_rate(unsigned rate)
126{
127 return ((rate << 10) + 62) / 125;
128}
129
130void usb_stream_free(struct usb_stream_kernel *sk)
131{
132 struct usb_stream *s;
133 unsigned u;
134
135 for (u = 0; u < USB_STREAM_NURBS; ++u) {
136 usb_free_urb(sk->inurb[u]);
137 sk->inurb[u] = NULL;
138 usb_free_urb(sk->outurb[u]);
139 sk->outurb[u] = NULL;
140 }
141
142 s = sk->s;
143 if (!s)
144 return;
145
146 free_pages((unsigned long)sk->write_page, get_order(s->write_size));
147 sk->write_page = NULL;
148 free_pages((unsigned long)s, get_order(s->read_size));
149 sk->s = NULL;
150}
151
152struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
153 struct usb_device *dev,
154 unsigned in_endpoint, unsigned out_endpoint,
155 unsigned sample_rate, unsigned use_packsize,
156 unsigned period_frames, unsigned frame_size)
157{
158 int packets, max_packsize;
159 int in_pipe, out_pipe;
160 int read_size = sizeof(struct usb_stream);
161 int write_size;
162 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
163 int pg;
164
165 in_pipe = usb_rcvisocpipe(dev, in_endpoint);
166 out_pipe = usb_sndisocpipe(dev, out_endpoint);
167
168 max_packsize = use_packsize ?
169 use_packsize : usb_maxpacket(dev, in_pipe, 0);
170
171
172
173
174
175
176
177 packets = period_frames * usb_frames / sample_rate + 1;
178
179 if (dev->speed == USB_SPEED_HIGH)
180 packets = (packets + 7) & ~7;
181
182 read_size += packets * USB_STREAM_URBDEPTH *
183 (max_packsize + sizeof(struct usb_stream_packet));
184
185 max_packsize = usb_maxpacket(dev, out_pipe, 1);
186 write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
187
188 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
189 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
190 goto out;
191 }
192
193 pg = get_order(read_size);
194 sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
195 if (!sk->s) {
196 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
197 goto out;
198 }
199 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION;
200
201 sk->s->read_size = read_size;
202
203 sk->s->cfg.sample_rate = sample_rate;
204 sk->s->cfg.frame_size = frame_size;
205 sk->n_o_ps = packets;
206 sk->s->inpackets = packets * USB_STREAM_URBDEPTH;
207 sk->s->cfg.period_frames = period_frames;
208 sk->s->period_size = frame_size * period_frames;
209
210 sk->s->write_size = write_size;
211 pg = get_order(write_size);
212
213 sk->write_page =
214 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
215 if (!sk->write_page) {
216 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
217 usb_stream_free(sk);
218 return NULL;
219 }
220
221
222 if (dev->speed == USB_SPEED_FULL)
223 sk->freqn = get_usb_full_speed_rate(sample_rate);
224 else
225 sk->freqn = get_usb_high_speed_rate(sample_rate);
226
227 init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
228 sk->s->state = usb_stream_stopped;
229out:
230 return sk->s;
231}
232
233
234
235
236static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
237{
238 bool r;
239 if (unlikely(urb->status)) {
240 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
241 snd_printk(KERN_WARNING "status=%i\n", urb->status);
242 sk->iso_frame_balance = 0x7FFFFFFF;
243 return false;
244 }
245 r = sk->iso_frame_balance == 0;
246 if (!r)
247 sk->i_urb = urb;
248 return r;
249}
250
251static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
252{
253 sk->iso_frame_balance += urb->number_of_packets;
254 return balance_check(sk, urb);
255}
256
257static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
258{
259 sk->iso_frame_balance -= urb->number_of_packets;
260 return balance_check(sk, urb);
261}
262
263static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
264{
265 int u;
266
267 for (u = 0; u < USB_STREAM_NURBS; u++) {
268 struct urb *urb = urbs[u];
269 urb->complete = complete;
270 }
271}
272
273static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
274 struct urb *inurb)
275{
276 struct usb_stream *s = sk->s;
277 struct urb *io;
278 struct usb_iso_packet_descriptor *id, *od;
279 int p = 0, lb = 0, l = 0;
280
281 io = sk->idle_outurb;
282 od = io->iso_frame_desc;
283
284 for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
285 struct urb *ii = sk->completed_inurb;
286 id = ii->iso_frame_desc +
287 ii->number_of_packets + s->sync_packet;
288 l = id->actual_length;
289
290 od[p].length = l;
291 od[p].offset = lb;
292 lb += l;
293 }
294
295 for (;
296 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
297 ++p, ++s->sync_packet) {
298 l = inurb->iso_frame_desc[s->sync_packet].actual_length;
299
300 if (s->idle_outsize + lb + l > s->period_size)
301 goto check_ok;
302
303 od[p].length = l;
304 od[p].offset = lb;
305 lb += l;
306 }
307
308check_ok:
309 s->sync_packet -= inurb->number_of_packets;
310 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
311 snd_printk(KERN_WARNING "invalid sync_packet = %i;"
312 " p=%i nop=%i %i %x %x %x > %x\n",
313 s->sync_packet, p, inurb->number_of_packets,
314 s->idle_outsize + lb + l,
315 s->idle_outsize, lb, l,
316 s->period_size);
317 return -1;
318 }
319 if (unlikely(lb % s->cfg.frame_size)) {
320 snd_printk(KERN_WARNING"invalid outsize = %i\n",
321 lb);
322 return -1;
323 }
324 s->idle_outsize += lb - s->period_size;
325 io->number_of_packets = p;
326 io->transfer_buffer_length = lb;
327 if (s->idle_outsize <= 0)
328 return 0;
329
330 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
331 return -1;
332}
333
334static void prepare_inurb(int number_of_packets, struct urb *iu)
335{
336 struct usb_iso_packet_descriptor *id;
337 int p;
338
339 iu->number_of_packets = number_of_packets;
340 id = iu->iso_frame_desc;
341 id->offset = 0;
342 for (p = 0; p < iu->number_of_packets - 1; ++p)
343 id[p + 1].offset = id[p].offset + id[p].length;
344
345 iu->transfer_buffer_length =
346 id[0].length * iu->number_of_packets;
347}
348
349static int submit_urbs(struct usb_stream_kernel *sk,
350 struct urb *inurb, struct urb *outurb)
351{
352 int err;
353 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
354 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
355 if (err < 0) {
356 snd_printk(KERN_ERR "%i\n", err);
357 return err;
358 }
359 sk->idle_inurb = sk->completed_inurb;
360 sk->completed_inurb = inurb;
361 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
362 if (err < 0) {
363 snd_printk(KERN_ERR "%i\n", err);
364 return err;
365 }
366 sk->idle_outurb = sk->completed_outurb;
367 sk->completed_outurb = outurb;
368 return 0;
369}
370
371#ifdef DEBUG_LOOP_BACK
372
373
374
375static void loop_back(struct usb_stream *s)
376{
377 char *i, *o;
378 int il, ol, l, p;
379 struct urb *iu;
380 struct usb_iso_packet_descriptor *id;
381
382 o = s->playback1st_to;
383 ol = s->playback1st_size;
384 l = 0;
385
386 if (s->insplit_pack >= 0) {
387 iu = sk->idle_inurb;
388 id = iu->iso_frame_desc;
389 p = s->insplit_pack;
390 } else
391 goto second;
392loop:
393 for (; p < iu->number_of_packets && l < s->period_size; ++p) {
394 i = iu->transfer_buffer + id[p].offset;
395 il = id[p].actual_length;
396 if (l + il > s->period_size)
397 il = s->period_size - l;
398 if (il <= ol) {
399 memcpy(o, i, il);
400 o += il;
401 ol -= il;
402 } else {
403 memcpy(o, i, ol);
404 singen_6pack(o, ol);
405 o = s->playback_to;
406 memcpy(o, i + ol, il - ol);
407 o += il - ol;
408 ol = s->period_size - s->playback1st_size;
409 }
410 l += il;
411 }
412 if (iu == sk->completed_inurb) {
413 if (l != s->period_size)
414 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
415 l/(int)s->cfg.frame_size);
416
417 return;
418 }
419second:
420 iu = sk->completed_inurb;
421 id = iu->iso_frame_desc;
422 p = 0;
423 goto loop;
424
425}
426#else
427static void loop_back(struct usb_stream *s)
428{
429}
430#endif
431
432static void stream_idle(struct usb_stream_kernel *sk,
433 struct urb *inurb, struct urb *outurb)
434{
435 struct usb_stream *s = sk->s;
436 int l, p;
437 int insize = s->idle_insize;
438 int urb_size = 0;
439
440 s->inpacket_split = s->next_inpacket_split;
441 s->inpacket_split_at = s->next_inpacket_split_at;
442 s->next_inpacket_split = -1;
443 s->next_inpacket_split_at = 0;
444
445 for (p = 0; p < inurb->number_of_packets; ++p) {
446 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
447 l = id[p].actual_length;
448 if (unlikely(l == 0 || id[p].status)) {
449 snd_printk(KERN_WARNING "underrun, status=%u\n",
450 id[p].status);
451 goto err_out;
452 }
453 s->inpacket_head++;
454 s->inpacket_head %= s->inpackets;
455 if (s->inpacket_split == -1)
456 s->inpacket_split = s->inpacket_head;
457
458 s->inpacket[s->inpacket_head].offset =
459 id[p].offset + (inurb->transfer_buffer - (void *)s);
460 s->inpacket[s->inpacket_head].length = l;
461 if (insize + l > s->period_size &&
462 s->next_inpacket_split == -1) {
463 s->next_inpacket_split = s->inpacket_head;
464 s->next_inpacket_split_at = s->period_size - insize;
465 }
466 insize += l;
467 urb_size += l;
468 }
469 s->idle_insize += urb_size - s->period_size;
470 if (s->idle_insize < 0) {
471 snd_printk(KERN_WARNING "%i\n",
472 (s->idle_insize)/(int)s->cfg.frame_size);
473 goto err_out;
474 }
475 s->insize_done += urb_size;
476
477 l = s->idle_outsize;
478 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
479 sk->write_page) - l;
480
481 if (usb_stream_prepare_playback(sk, inurb) < 0)
482 goto err_out;
483
484 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
485 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
486 sk->write_page;
487
488 if (submit_urbs(sk, inurb, outurb) < 0)
489 goto err_out;
490
491 loop_back(s);
492 s->periods_done++;
493 wake_up_all(&sk->sleep);
494 return;
495err_out:
496 s->state = usb_stream_xrun;
497 wake_up_all(&sk->sleep);
498}
499
500static void i_capture_idle(struct urb *urb)
501{
502 struct usb_stream_kernel *sk = urb->context;
503 if (balance_capture(sk, urb))
504 stream_idle(sk, urb, sk->i_urb);
505}
506
507static void i_playback_idle(struct urb *urb)
508{
509 struct usb_stream_kernel *sk = urb->context;
510 if (balance_playback(sk, urb))
511 stream_idle(sk, sk->i_urb, urb);
512}
513
514static void stream_start(struct usb_stream_kernel *sk,
515 struct urb *inurb, struct urb *outurb)
516{
517 struct usb_stream *s = sk->s;
518 if (s->state >= usb_stream_sync1) {
519 int l, p, max_diff, max_diff_0;
520 int urb_size = 0;
521 unsigned frames_per_packet, min_frames = 0;
522 frames_per_packet = (s->period_size - s->idle_insize);
523 frames_per_packet <<= 8;
524 frames_per_packet /=
525 s->cfg.frame_size * inurb->number_of_packets;
526 frames_per_packet++;
527
528 max_diff_0 = s->cfg.frame_size;
529 if (s->cfg.period_frames >= 256)
530 max_diff_0 <<= 1;
531 if (s->cfg.period_frames >= 1024)
532 max_diff_0 <<= 1;
533 max_diff = max_diff_0;
534 for (p = 0; p < inurb->number_of_packets; ++p) {
535 int diff;
536 l = inurb->iso_frame_desc[p].actual_length;
537 urb_size += l;
538
539 min_frames += frames_per_packet;
540 diff = urb_size -
541 (min_frames >> 8) * s->cfg.frame_size;
542 if (diff < max_diff) {
543 snd_printdd(KERN_DEBUG "%i %i %i %i\n",
544 s->insize_done,
545 urb_size / (int)s->cfg.frame_size,
546 inurb->number_of_packets, diff);
547 max_diff = diff;
548 }
549 }
550 s->idle_insize -= max_diff - max_diff_0;
551 s->idle_insize += urb_size - s->period_size;
552 if (s->idle_insize < 0) {
553 snd_printk(KERN_WARNING "%i %i %i\n",
554 s->idle_insize, urb_size, s->period_size);
555 return;
556 } else if (s->idle_insize == 0) {
557 s->next_inpacket_split =
558 (s->inpacket_head + 1) % s->inpackets;
559 s->next_inpacket_split_at = 0;
560 } else {
561 unsigned split = s->inpacket_head;
562 l = s->idle_insize;
563 while (l > s->inpacket[split].length) {
564 l -= s->inpacket[split].length;
565 if (split == 0)
566 split = s->inpackets - 1;
567 else
568 split--;
569 }
570 s->next_inpacket_split = split;
571 s->next_inpacket_split_at =
572 s->inpacket[split].length - l;
573 }
574
575 s->insize_done += urb_size;
576
577 if (usb_stream_prepare_playback(sk, inurb) < 0)
578 return;
579
580 } else
581 playback_prep_freqn(sk, sk->idle_outurb);
582
583 if (submit_urbs(sk, inurb, outurb) < 0)
584 return;
585
586 if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
587
588 s->state = usb_stream_ready;
589 subs_set_complete(sk->inurb, i_capture_idle);
590 subs_set_complete(sk->outurb, i_playback_idle);
591 }
592}
593
594static void i_capture_start(struct urb *urb)
595{
596 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
597 struct usb_stream_kernel *sk = urb->context;
598 struct usb_stream *s = sk->s;
599 int p;
600 int empty = 0;
601
602 if (urb->status) {
603 snd_printk(KERN_WARNING "status=%i\n", urb->status);
604 return;
605 }
606
607 for (p = 0; p < urb->number_of_packets; ++p) {
608 int l = id[p].actual_length;
609 if (l < s->cfg.frame_size) {
610 ++empty;
611 if (s->state >= usb_stream_sync0) {
612 snd_printk(KERN_WARNING "%i\n", l);
613 return;
614 }
615 }
616 s->inpacket_head++;
617 s->inpacket_head %= s->inpackets;
618 s->inpacket[s->inpacket_head].offset =
619 id[p].offset + (urb->transfer_buffer - (void *)s);
620 s->inpacket[s->inpacket_head].length = l;
621 }
622#ifdef SHOW_EMPTY
623 if (empty) {
624 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
625 urb->iso_frame_desc[0].actual_length);
626 for (pack = 1; pack < urb->number_of_packets; ++pack) {
627 int l = urb->iso_frame_desc[pack].actual_length;
628 printk(" %i", l);
629 }
630 printk("\n");
631 }
632#endif
633 if (!empty && s->state < usb_stream_sync1)
634 ++s->state;
635
636 if (balance_capture(sk, urb))
637 stream_start(sk, urb, sk->i_urb);
638}
639
640static void i_playback_start(struct urb *urb)
641{
642 struct usb_stream_kernel *sk = urb->context;
643 if (balance_playback(sk, urb))
644 stream_start(sk, sk->i_urb, urb);
645}
646
647int usb_stream_start(struct usb_stream_kernel *sk)
648{
649 struct usb_stream *s = sk->s;
650 int frame = 0, iters = 0;
651 int u, err;
652 int try = 0;
653
654 if (s->state != usb_stream_stopped)
655 return -EAGAIN;
656
657 subs_set_complete(sk->inurb, i_capture_start);
658 subs_set_complete(sk->outurb, i_playback_start);
659 memset(sk->write_page, 0, s->write_size);
660dotry:
661 s->insize_done = 0;
662 s->idle_insize = 0;
663 s->idle_outsize = 0;
664 s->sync_packet = -1;
665 s->inpacket_head = -1;
666 sk->iso_frame_balance = 0;
667 ++try;
668 for (u = 0; u < 2; u++) {
669 struct urb *inurb = sk->inurb[u];
670 struct urb *outurb = sk->outurb[u];
671 playback_prep_freqn(sk, outurb);
672 inurb->number_of_packets = outurb->number_of_packets;
673 inurb->transfer_buffer_length =
674 inurb->number_of_packets *
675 inurb->iso_frame_desc[0].length;
676 preempt_disable();
677 if (u == 0) {
678 int now;
679 struct usb_device *dev = inurb->dev;
680 frame = usb_get_current_frame_number(dev);
681 do {
682 now = usb_get_current_frame_number(dev);
683 ++iters;
684 } while (now > -1 && now == frame);
685 }
686 err = usb_submit_urb(inurb, GFP_ATOMIC);
687 if (err < 0) {
688 preempt_enable();
689 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
690 " returned %i\n", u, err);
691 return err;
692 }
693 err = usb_submit_urb(outurb, GFP_ATOMIC);
694 if (err < 0) {
695 preempt_enable();
696 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
697 " returned %i\n", u, err);
698 return err;
699 }
700 preempt_enable();
701 if (inurb->start_frame != outurb->start_frame) {
702 snd_printd(KERN_DEBUG
703 "u[%i] start_frames differ in:%u out:%u\n",
704 u, inurb->start_frame, outurb->start_frame);
705 goto check_retry;
706 }
707 }
708 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
709 try = 0;
710check_retry:
711 if (try) {
712 usb_stream_stop(sk);
713 if (try < 5) {
714 msleep(1500);
715 snd_printd(KERN_DEBUG "goto dotry;\n");
716 goto dotry;
717 }
718 snd_printk(KERN_WARNING"couldn't start"
719 " all urbs on the same start_frame.\n");
720 return -EFAULT;
721 }
722
723 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
724 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
725 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
726 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
727
728
729 {
730 int wait_ms = 3000;
731 while (s->state != usb_stream_ready && wait_ms > 0) {
732 snd_printdd(KERN_DEBUG "%i\n", s->state);
733 msleep(200);
734 wait_ms -= 200;
735 }
736 }
737
738 return s->state == usb_stream_ready ? 0 : -EFAULT;
739}
740
741
742
743
744void usb_stream_stop(struct usb_stream_kernel *sk)
745{
746 int u;
747 if (!sk->s)
748 return;
749 for (u = 0; u < USB_STREAM_NURBS; ++u) {
750 usb_kill_urb(sk->inurb[u]);
751 usb_kill_urb(sk->outurb[u]);
752 }
753 sk->s->state = usb_stream_stopped;
754 msleep(400);
755}
756
