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19#include <linux/usb.h>
20#include <linux/gfp.h>
21
22#include "usb_stream.h"
23
24
25
26
27static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk)
28{
29 struct usb_stream *s = sk->s;
30 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn;
31 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size;
32}
33
34static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
35{
36 struct usb_stream *s = sk->s;
37 int pack, lb = 0;
38
39 for (pack = 0; pack < sk->n_o_ps; pack++) {
40 int l = usb_stream_next_packet_size(sk);
41 if (s->idle_outsize + lb + l > s->period_size)
42 goto check;
43
44 sk->out_phase = sk->out_phase_peeked;
45 urb->iso_frame_desc[pack].offset = lb;
46 urb->iso_frame_desc[pack].length = l;
47 lb += l;
48 }
49 snd_printdd(KERN_DEBUG "%i\n", lb);
50
51check:
52 urb->number_of_packets = pack;
53 urb->transfer_buffer_length = lb;
54 s->idle_outsize += lb - s->period_size;
55 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize,
56 lb, s->period_size);
57}
58
59static int init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
60 struct urb **urbs, char *transfer,
61 struct usb_device *dev, int pipe)
62{
63 int u, p;
64 int maxpacket = use_packsize ?
65 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe));
66 int transfer_length = maxpacket * sk->n_o_ps;
67
68 for (u = 0; u < USB_STREAM_NURBS;
69 ++u, transfer += transfer_length) {
70 struct urb *urb = urbs[u];
71 struct usb_iso_packet_descriptor *desc;
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 if (usb_urb_ep_type_check(urb))
81 return -EINVAL;
82
83 urb->transfer_buffer_length = transfer_length;
84 desc = urb->iso_frame_desc;
85 desc->offset = 0;
86 desc->length = maxpacket;
87 for (p = 1; p < sk->n_o_ps; ++p) {
88 desc[p].offset = desc[p - 1].offset + maxpacket;
89 desc[p].length = maxpacket;
90 }
91 }
92
93 return 0;
94}
95
96static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
97 struct usb_device *dev, int in_pipe, int out_pipe)
98{
99 struct usb_stream *s = sk->s;
100 char *indata = (char *)s + sizeof(*s) +
101 sizeof(struct usb_stream_packet) *
102 s->inpackets;
103 int u;
104
105 for (u = 0; u < USB_STREAM_NURBS; ++u) {
106 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
107 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
108 }
109
110 if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) ||
111 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
112 out_pipe))
113 return -EINVAL;
114
115 return 0;
116}
117
118
119
120
121
122
123static inline unsigned get_usb_full_speed_rate(unsigned rate)
124{
125 return ((rate << 13) + 62) / 125;
126}
127
128
129
130
131
132static inline unsigned get_usb_high_speed_rate(unsigned rate)
133{
134 return ((rate << 10) + 62) / 125;
135}
136
137void usb_stream_free(struct usb_stream_kernel *sk)
138{
139 struct usb_stream *s;
140 unsigned u;
141
142 for (u = 0; u < USB_STREAM_NURBS; ++u) {
143 usb_free_urb(sk->inurb[u]);
144 sk->inurb[u] = NULL;
145 usb_free_urb(sk->outurb[u]);
146 sk->outurb[u] = NULL;
147 }
148
149 s = sk->s;
150 if (!s)
151 return;
152
153 free_pages((unsigned long)sk->write_page, get_order(s->write_size));
154 sk->write_page = NULL;
155 free_pages((unsigned long)s, get_order(s->read_size));
156 sk->s = NULL;
157}
158
159struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
160 struct usb_device *dev,
161 unsigned in_endpoint, unsigned out_endpoint,
162 unsigned sample_rate, unsigned use_packsize,
163 unsigned period_frames, unsigned frame_size)
164{
165 int packets, max_packsize;
166 int in_pipe, out_pipe;
167 int read_size = sizeof(struct usb_stream);
168 int write_size;
169 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
170 int pg;
171
172 in_pipe = usb_rcvisocpipe(dev, in_endpoint);
173 out_pipe = usb_sndisocpipe(dev, out_endpoint);
174
175 max_packsize = use_packsize ?
176 use_packsize : usb_maxpacket(dev, in_pipe, 0);
177
178
179
180
181
182
183
184 packets = period_frames * usb_frames / sample_rate + 1;
185
186 if (dev->speed == USB_SPEED_HIGH)
187 packets = (packets + 7) & ~7;
188
189 read_size += packets * USB_STREAM_URBDEPTH *
190 (max_packsize + sizeof(struct usb_stream_packet));
191
192 max_packsize = usb_maxpacket(dev, out_pipe, 1);
193 write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
194
195 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
196 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
197 goto out;
198 }
199
200 pg = get_order(read_size);
201 sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO|
202 __GFP_NOWARN, pg);
203 if (!sk->s) {
204 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
205 goto out;
206 }
207 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION;
208
209 sk->s->read_size = read_size;
210
211 sk->s->cfg.sample_rate = sample_rate;
212 sk->s->cfg.frame_size = frame_size;
213 sk->n_o_ps = packets;
214 sk->s->inpackets = packets * USB_STREAM_URBDEPTH;
215 sk->s->cfg.period_frames = period_frames;
216 sk->s->period_size = frame_size * period_frames;
217
218 sk->s->write_size = write_size;
219 pg = get_order(write_size);
220
221 sk->write_page =
222 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO|
223 __GFP_NOWARN, pg);
224 if (!sk->write_page) {
225 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
226 usb_stream_free(sk);
227 return NULL;
228 }
229
230
231 if (dev->speed == USB_SPEED_FULL)
232 sk->freqn = get_usb_full_speed_rate(sample_rate);
233 else
234 sk->freqn = get_usb_high_speed_rate(sample_rate);
235
236 if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) {
237 usb_stream_free(sk);
238 return NULL;
239 }
240
241 sk->s->state = usb_stream_stopped;
242out:
243 return sk->s;
244}
245
246
247
248
249static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
250{
251 bool r;
252 if (unlikely(urb->status)) {
253 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
254 snd_printk(KERN_WARNING "status=%i\n", urb->status);
255 sk->iso_frame_balance = 0x7FFFFFFF;
256 return false;
257 }
258 r = sk->iso_frame_balance == 0;
259 if (!r)
260 sk->i_urb = urb;
261 return r;
262}
263
264static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
265{
266 sk->iso_frame_balance += urb->number_of_packets;
267 return balance_check(sk, urb);
268}
269
270static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
271{
272 sk->iso_frame_balance -= urb->number_of_packets;
273 return balance_check(sk, urb);
274}
275
276static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
277{
278 int u;
279
280 for (u = 0; u < USB_STREAM_NURBS; u++) {
281 struct urb *urb = urbs[u];
282 urb->complete = complete;
283 }
284}
285
286static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
287 struct urb *inurb)
288{
289 struct usb_stream *s = sk->s;
290 struct urb *io;
291 struct usb_iso_packet_descriptor *id, *od;
292 int p = 0, lb = 0, l = 0;
293
294 io = sk->idle_outurb;
295 od = io->iso_frame_desc;
296
297 for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
298 struct urb *ii = sk->completed_inurb;
299 id = ii->iso_frame_desc +
300 ii->number_of_packets + s->sync_packet;
301 l = id->actual_length;
302
303 od[p].length = l;
304 od[p].offset = lb;
305 lb += l;
306 }
307
308 for (;
309 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
310 ++p, ++s->sync_packet) {
311 l = inurb->iso_frame_desc[s->sync_packet].actual_length;
312
313 if (s->idle_outsize + lb + l > s->period_size)
314 goto check_ok;
315
316 od[p].length = l;
317 od[p].offset = lb;
318 lb += l;
319 }
320
321check_ok:
322 s->sync_packet -= inurb->number_of_packets;
323 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
324 snd_printk(KERN_WARNING "invalid sync_packet = %i;"
325 " p=%i nop=%i %i %x %x %x > %x\n",
326 s->sync_packet, p, inurb->number_of_packets,
327 s->idle_outsize + lb + l,
328 s->idle_outsize, lb, l,
329 s->period_size);
330 return -1;
331 }
332 if (unlikely(lb % s->cfg.frame_size)) {
333 snd_printk(KERN_WARNING"invalid outsize = %i\n",
334 lb);
335 return -1;
336 }
337 s->idle_outsize += lb - s->period_size;
338 io->number_of_packets = p;
339 io->transfer_buffer_length = lb;
340 if (s->idle_outsize <= 0)
341 return 0;
342
343 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
344 return -1;
345}
346
347static void prepare_inurb(int number_of_packets, struct urb *iu)
348{
349 struct usb_iso_packet_descriptor *id;
350 int p;
351
352 iu->number_of_packets = number_of_packets;
353 id = iu->iso_frame_desc;
354 id->offset = 0;
355 for (p = 0; p < iu->number_of_packets - 1; ++p)
356 id[p + 1].offset = id[p].offset + id[p].length;
357
358 iu->transfer_buffer_length =
359 id[0].length * iu->number_of_packets;
360}
361
362static int submit_urbs(struct usb_stream_kernel *sk,
363 struct urb *inurb, struct urb *outurb)
364{
365 int err;
366 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
367 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
368 if (err < 0)
369 goto report_failure;
370
371 sk->idle_inurb = sk->completed_inurb;
372 sk->completed_inurb = inurb;
373 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
374 if (err < 0)
375 goto report_failure;
376
377 sk->idle_outurb = sk->completed_outurb;
378 sk->completed_outurb = outurb;
379 return 0;
380
381report_failure:
382 snd_printk(KERN_ERR "%i\n", err);
383 return err;
384}
385
386#ifdef DEBUG_LOOP_BACK
387
388
389
390static void loop_back(struct usb_stream *s)
391{
392 char *i, *o;
393 int il, ol, l, p;
394 struct urb *iu;
395 struct usb_iso_packet_descriptor *id;
396
397 o = s->playback1st_to;
398 ol = s->playback1st_size;
399 l = 0;
400
401 if (s->insplit_pack >= 0) {
402 iu = sk->idle_inurb;
403 id = iu->iso_frame_desc;
404 p = s->insplit_pack;
405 } else
406 goto second;
407loop:
408 for (; p < iu->number_of_packets && l < s->period_size; ++p) {
409 i = iu->transfer_buffer + id[p].offset;
410 il = id[p].actual_length;
411 if (l + il > s->period_size)
412 il = s->period_size - l;
413 if (il <= ol) {
414 memcpy(o, i, il);
415 o += il;
416 ol -= il;
417 } else {
418 memcpy(o, i, ol);
419 singen_6pack(o, ol);
420 o = s->playback_to;
421 memcpy(o, i + ol, il - ol);
422 o += il - ol;
423 ol = s->period_size - s->playback1st_size;
424 }
425 l += il;
426 }
427 if (iu == sk->completed_inurb) {
428 if (l != s->period_size)
429 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
430 l/(int)s->cfg.frame_size);
431
432 return;
433 }
434second:
435 iu = sk->completed_inurb;
436 id = iu->iso_frame_desc;
437 p = 0;
438 goto loop;
439
440}
441#else
442static void loop_back(struct usb_stream *s)
443{
444}
445#endif
446
447static void stream_idle(struct usb_stream_kernel *sk,
448 struct urb *inurb, struct urb *outurb)
449{
450 struct usb_stream *s = sk->s;
451 int l, p;
452 int insize = s->idle_insize;
453 int urb_size = 0;
454
455 s->inpacket_split = s->next_inpacket_split;
456 s->inpacket_split_at = s->next_inpacket_split_at;
457 s->next_inpacket_split = -1;
458 s->next_inpacket_split_at = 0;
459
460 for (p = 0; p < inurb->number_of_packets; ++p) {
461 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
462 l = id[p].actual_length;
463 if (unlikely(l == 0 || id[p].status)) {
464 snd_printk(KERN_WARNING "underrun, status=%u\n",
465 id[p].status);
466 goto err_out;
467 }
468 s->inpacket_head++;
469 s->inpacket_head %= s->inpackets;
470 if (s->inpacket_split == -1)
471 s->inpacket_split = s->inpacket_head;
472
473 s->inpacket[s->inpacket_head].offset =
474 id[p].offset + (inurb->transfer_buffer - (void *)s);
475 s->inpacket[s->inpacket_head].length = l;
476 if (insize + l > s->period_size &&
477 s->next_inpacket_split == -1) {
478 s->next_inpacket_split = s->inpacket_head;
479 s->next_inpacket_split_at = s->period_size - insize;
480 }
481 insize += l;
482 urb_size += l;
483 }
484 s->idle_insize += urb_size - s->period_size;
485 if (s->idle_insize < 0) {
486 snd_printk(KERN_WARNING "%i\n",
487 (s->idle_insize)/(int)s->cfg.frame_size);
488 goto err_out;
489 }
490 s->insize_done += urb_size;
491
492 l = s->idle_outsize;
493 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
494 sk->write_page) - l;
495
496 if (usb_stream_prepare_playback(sk, inurb) < 0)
497 goto err_out;
498
499 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
500 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
501 sk->write_page;
502
503 if (submit_urbs(sk, inurb, outurb) < 0)
504 goto err_out;
505
506 loop_back(s);
507 s->periods_done++;
508 wake_up_all(&sk->sleep);
509 return;
510err_out:
511 s->state = usb_stream_xrun;
512 wake_up_all(&sk->sleep);
513}
514
515static void i_capture_idle(struct urb *urb)
516{
517 struct usb_stream_kernel *sk = urb->context;
518 if (balance_capture(sk, urb))
519 stream_idle(sk, urb, sk->i_urb);
520}
521
522static void i_playback_idle(struct urb *urb)
523{
524 struct usb_stream_kernel *sk = urb->context;
525 if (balance_playback(sk, urb))
526 stream_idle(sk, sk->i_urb, urb);
527}
528
529static void stream_start(struct usb_stream_kernel *sk,
530 struct urb *inurb, struct urb *outurb)
531{
532 struct usb_stream *s = sk->s;
533 if (s->state >= usb_stream_sync1) {
534 int l, p, max_diff, max_diff_0;
535 int urb_size = 0;
536 unsigned frames_per_packet, min_frames = 0;
537 frames_per_packet = (s->period_size - s->idle_insize);
538 frames_per_packet <<= 8;
539 frames_per_packet /=
540 s->cfg.frame_size * inurb->number_of_packets;
541 frames_per_packet++;
542
543 max_diff_0 = s->cfg.frame_size;
544 if (s->cfg.period_frames >= 256)
545 max_diff_0 <<= 1;
546 if (s->cfg.period_frames >= 1024)
547 max_diff_0 <<= 1;
548 max_diff = max_diff_0;
549 for (p = 0; p < inurb->number_of_packets; ++p) {
550 int diff;
551 l = inurb->iso_frame_desc[p].actual_length;
552 urb_size += l;
553
554 min_frames += frames_per_packet;
555 diff = urb_size -
556 (min_frames >> 8) * s->cfg.frame_size;
557 if (diff < max_diff) {
558 snd_printdd(KERN_DEBUG "%i %i %i %i\n",
559 s->insize_done,
560 urb_size / (int)s->cfg.frame_size,
561 inurb->number_of_packets, diff);
562 max_diff = diff;
563 }
564 }
565 s->idle_insize -= max_diff - max_diff_0;
566 s->idle_insize += urb_size - s->period_size;
567 if (s->idle_insize < 0) {
568 snd_printk(KERN_WARNING "%i %i %i\n",
569 s->idle_insize, urb_size, s->period_size);
570 return;
571 } else if (s->idle_insize == 0) {
572 s->next_inpacket_split =
573 (s->inpacket_head + 1) % s->inpackets;
574 s->next_inpacket_split_at = 0;
575 } else {
576 unsigned split = s->inpacket_head;
577 l = s->idle_insize;
578 while (l > s->inpacket[split].length) {
579 l -= s->inpacket[split].length;
580 if (split == 0)
581 split = s->inpackets - 1;
582 else
583 split--;
584 }
585 s->next_inpacket_split = split;
586 s->next_inpacket_split_at =
587 s->inpacket[split].length - l;
588 }
589
590 s->insize_done += urb_size;
591
592 if (usb_stream_prepare_playback(sk, inurb) < 0)
593 return;
594
595 } else
596 playback_prep_freqn(sk, sk->idle_outurb);
597
598 if (submit_urbs(sk, inurb, outurb) < 0)
599 return;
600
601 if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
602
603 s->state = usb_stream_ready;
604 subs_set_complete(sk->inurb, i_capture_idle);
605 subs_set_complete(sk->outurb, i_playback_idle);
606 }
607}
608
609static void i_capture_start(struct urb *urb)
610{
611 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
612 struct usb_stream_kernel *sk = urb->context;
613 struct usb_stream *s = sk->s;
614 int p;
615 int empty = 0;
616
617 if (urb->status) {
618 snd_printk(KERN_WARNING "status=%i\n", urb->status);
619 return;
620 }
621
622 for (p = 0; p < urb->number_of_packets; ++p) {
623 int l = id[p].actual_length;
624 if (l < s->cfg.frame_size) {
625 ++empty;
626 if (s->state >= usb_stream_sync0) {
627 snd_printk(KERN_WARNING "%i\n", l);
628 return;
629 }
630 }
631 s->inpacket_head++;
632 s->inpacket_head %= s->inpackets;
633 s->inpacket[s->inpacket_head].offset =
634 id[p].offset + (urb->transfer_buffer - (void *)s);
635 s->inpacket[s->inpacket_head].length = l;
636 }
637#ifdef SHOW_EMPTY
638 if (empty) {
639 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
640 urb->iso_frame_desc[0].actual_length);
641 for (pack = 1; pack < urb->number_of_packets; ++pack) {
642 int l = urb->iso_frame_desc[pack].actual_length;
643 printk(KERN_CONT " %i", l);
644 }
645 printk(KERN_CONT "\n");
646 }
647#endif
648 if (!empty && s->state < usb_stream_sync1)
649 ++s->state;
650
651 if (balance_capture(sk, urb))
652 stream_start(sk, urb, sk->i_urb);
653}
654
655static void i_playback_start(struct urb *urb)
656{
657 struct usb_stream_kernel *sk = urb->context;
658 if (balance_playback(sk, urb))
659 stream_start(sk, sk->i_urb, urb);
660}
661
662int usb_stream_start(struct usb_stream_kernel *sk)
663{
664 struct usb_stream *s = sk->s;
665 int frame = 0, iters = 0;
666 int u, err;
667 int try = 0;
668
669 if (s->state != usb_stream_stopped)
670 return -EAGAIN;
671
672 subs_set_complete(sk->inurb, i_capture_start);
673 subs_set_complete(sk->outurb, i_playback_start);
674 memset(sk->write_page, 0, s->write_size);
675dotry:
676 s->insize_done = 0;
677 s->idle_insize = 0;
678 s->idle_outsize = 0;
679 s->sync_packet = -1;
680 s->inpacket_head = -1;
681 sk->iso_frame_balance = 0;
682 ++try;
683 for (u = 0; u < 2; u++) {
684 struct urb *inurb = sk->inurb[u];
685 struct urb *outurb = sk->outurb[u];
686 playback_prep_freqn(sk, outurb);
687 inurb->number_of_packets = outurb->number_of_packets;
688 inurb->transfer_buffer_length =
689 inurb->number_of_packets *
690 inurb->iso_frame_desc[0].length;
691
692 if (u == 0) {
693 int now;
694 struct usb_device *dev = inurb->dev;
695 frame = usb_get_current_frame_number(dev);
696 do {
697 now = usb_get_current_frame_number(dev);
698 ++iters;
699 } while (now > -1 && now == frame);
700 }
701 err = usb_submit_urb(inurb, GFP_ATOMIC);
702 if (err < 0) {
703 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
704 " returned %i\n", u, err);
705 return err;
706 }
707 err = usb_submit_urb(outurb, GFP_ATOMIC);
708 if (err < 0) {
709 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
710 " returned %i\n", u, err);
711 return err;
712 }
713
714 if (inurb->start_frame != outurb->start_frame) {
715 snd_printd(KERN_DEBUG
716 "u[%i] start_frames differ in:%u out:%u\n",
717 u, inurb->start_frame, outurb->start_frame);
718 goto check_retry;
719 }
720 }
721 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
722 try = 0;
723check_retry:
724 if (try) {
725 usb_stream_stop(sk);
726 if (try < 5) {
727 msleep(1500);
728 snd_printd(KERN_DEBUG "goto dotry;\n");
729 goto dotry;
730 }
731 snd_printk(KERN_WARNING"couldn't start"
732 " all urbs on the same start_frame.\n");
733 return -EFAULT;
734 }
735
736 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
737 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
738 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
739 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
740
741
742 {
743 int wait_ms = 3000;
744 while (s->state != usb_stream_ready && wait_ms > 0) {
745 snd_printdd(KERN_DEBUG "%i\n", s->state);
746 msleep(200);
747 wait_ms -= 200;
748 }
749 }
750
751 return s->state == usb_stream_ready ? 0 : -EFAULT;
752}
753
754
755
756
757void usb_stream_stop(struct usb_stream_kernel *sk)
758{
759 int u;
760 if (!sk->s)
761 return;
762 for (u = 0; u < USB_STREAM_NURBS; ++u) {
763 usb_kill_urb(sk->inurb[u]);
764 usb_kill_urb(sk->outurb[u]);
765 }
766 sk->s->state = usb_stream_stopped;
767 msleep(400);
768}
769
