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ALSA: usb-audio: Fix races at disconnection
[deliverable/linux.git] / sound / usb / pcm.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/ratelimit.h>
20 #include <linux/usb.h>
21 #include <linux/usb/audio.h>
22 #include <linux/usb/audio-v2.h>
23
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27
28 #include "usbaudio.h"
29 #include "card.h"
30 #include "quirks.h"
31 #include "debug.h"
32 #include "endpoint.h"
33 #include "helper.h"
34 #include "pcm.h"
35 #include "clock.h"
36 #include "power.h"
37
38 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
40
41 /* return the estimated delay based on USB frame counters */
42 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
43 unsigned int rate)
44 {
45 int current_frame_number;
46 int frame_diff;
47 int est_delay;
48
49 current_frame_number = usb_get_current_frame_number(subs->dev);
50 /*
51 * HCD implementations use different widths, use lower 8 bits.
52 * The delay will be managed up to 256ms, which is more than
53 * enough
54 */
55 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
56
57 /* Approximation based on number of samples per USB frame (ms),
58 some truncation for 44.1 but the estimate is good enough */
59 est_delay = subs->last_delay - (frame_diff * rate / 1000);
60 if (est_delay < 0)
61 est_delay = 0;
62 return est_delay;
63 }
64
65 /*
66 * return the current pcm pointer. just based on the hwptr_done value.
67 */
68 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
69 {
70 struct snd_usb_substream *subs;
71 unsigned int hwptr_done;
72
73 subs = (struct snd_usb_substream *)substream->runtime->private_data;
74 if (subs->stream->chip->shutdown)
75 return SNDRV_PCM_POS_XRUN;
76 spin_lock(&subs->lock);
77 hwptr_done = subs->hwptr_done;
78 substream->runtime->delay = snd_usb_pcm_delay(subs,
79 substream->runtime->rate);
80 spin_unlock(&subs->lock);
81 return hwptr_done / (substream->runtime->frame_bits >> 3);
82 }
83
84 /*
85 * find a matching audio format
86 */
87 static struct audioformat *find_format(struct snd_usb_substream *subs)
88 {
89 struct list_head *p;
90 struct audioformat *found = NULL;
91 int cur_attr = 0, attr;
92
93 list_for_each(p, &subs->fmt_list) {
94 struct audioformat *fp;
95 fp = list_entry(p, struct audioformat, list);
96 if (!(fp->formats & (1uLL << subs->pcm_format)))
97 continue;
98 if (fp->channels != subs->channels)
99 continue;
100 if (subs->cur_rate < fp->rate_min ||
101 subs->cur_rate > fp->rate_max)
102 continue;
103 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
104 unsigned int i;
105 for (i = 0; i < fp->nr_rates; i++)
106 if (fp->rate_table[i] == subs->cur_rate)
107 break;
108 if (i >= fp->nr_rates)
109 continue;
110 }
111 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
112 if (! found) {
113 found = fp;
114 cur_attr = attr;
115 continue;
116 }
117 /* avoid async out and adaptive in if the other method
118 * supports the same format.
119 * this is a workaround for the case like
120 * M-audio audiophile USB.
121 */
122 if (attr != cur_attr) {
123 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
125 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
126 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
127 continue;
128 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
129 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
130 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
131 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
132 found = fp;
133 cur_attr = attr;
134 continue;
135 }
136 }
137 /* find the format with the largest max. packet size */
138 if (fp->maxpacksize > found->maxpacksize) {
139 found = fp;
140 cur_attr = attr;
141 }
142 }
143 return found;
144 }
145
146 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
147 struct usb_host_interface *alts,
148 struct audioformat *fmt)
149 {
150 struct usb_device *dev = chip->dev;
151 unsigned int ep;
152 unsigned char data[1];
153 int err;
154
155 ep = get_endpoint(alts, 0)->bEndpointAddress;
156
157 data[0] = 1;
158 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
159 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
160 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
161 data, sizeof(data))) < 0) {
162 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
163 dev->devnum, iface, ep);
164 return err;
165 }
166
167 return 0;
168 }
169
170 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
171 struct usb_host_interface *alts,
172 struct audioformat *fmt)
173 {
174 struct usb_device *dev = chip->dev;
175 unsigned char data[1];
176 unsigned int ep;
177 int err;
178
179 ep = get_endpoint(alts, 0)->bEndpointAddress;
180
181 data[0] = 1;
182 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
183 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
184 UAC2_EP_CS_PITCH << 8, 0,
185 data, sizeof(data))) < 0) {
186 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
187 dev->devnum, iface, fmt->altsetting);
188 return err;
189 }
190
191 return 0;
192 }
193
194 /*
195 * initialize the pitch control and sample rate
196 */
197 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
198 struct usb_host_interface *alts,
199 struct audioformat *fmt)
200 {
201 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
202
203 /* if endpoint doesn't have pitch control, bail out */
204 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
205 return 0;
206
207 switch (altsd->bInterfaceProtocol) {
208 case UAC_VERSION_1:
209 default:
210 return init_pitch_v1(chip, iface, alts, fmt);
211
212 case UAC_VERSION_2:
213 return init_pitch_v2(chip, iface, alts, fmt);
214 }
215 }
216
217 static int start_endpoints(struct snd_usb_substream *subs, int can_sleep)
218 {
219 int err;
220
221 if (!subs->data_endpoint)
222 return -EINVAL;
223
224 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
225 struct snd_usb_endpoint *ep = subs->data_endpoint;
226
227 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
228
229 ep->data_subs = subs;
230 err = snd_usb_endpoint_start(ep, can_sleep);
231 if (err < 0) {
232 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
233 return err;
234 }
235 }
236
237 if (subs->sync_endpoint &&
238 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
239 struct snd_usb_endpoint *ep = subs->sync_endpoint;
240
241 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
242 subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
243 err = usb_set_interface(subs->dev,
244 subs->sync_endpoint->iface,
245 subs->sync_endpoint->alt_idx);
246 if (err < 0) {
247 snd_printk(KERN_ERR
248 "%d:%d:%d: cannot set interface (%d)\n",
249 subs->dev->devnum,
250 subs->sync_endpoint->iface,
251 subs->sync_endpoint->alt_idx, err);
252 return -EIO;
253 }
254 }
255
256 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
257
258 ep->sync_slave = subs->data_endpoint;
259 err = snd_usb_endpoint_start(ep, can_sleep);
260 if (err < 0) {
261 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
262 return err;
263 }
264 }
265
266 return 0;
267 }
268
269 static void stop_endpoints(struct snd_usb_substream *subs,
270 int force, int can_sleep, int wait)
271 {
272 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
273 snd_usb_endpoint_stop(subs->sync_endpoint,
274 force, can_sleep, wait);
275
276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
277 snd_usb_endpoint_stop(subs->data_endpoint,
278 force, can_sleep, wait);
279 }
280
281 static int deactivate_endpoints(struct snd_usb_substream *subs)
282 {
283 int reta, retb;
284
285 reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
286 retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
287
288 if (reta < 0)
289 return reta;
290
291 if (retb < 0)
292 return retb;
293
294 return 0;
295 }
296
297 /*
298 * find a matching format and set up the interface
299 */
300 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
301 {
302 struct usb_device *dev = subs->dev;
303 struct usb_host_interface *alts;
304 struct usb_interface_descriptor *altsd;
305 struct usb_interface *iface;
306 unsigned int ep, attr;
307 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
308 int err, implicit_fb = 0;
309
310 iface = usb_ifnum_to_if(dev, fmt->iface);
311 if (WARN_ON(!iface))
312 return -EINVAL;
313 alts = &iface->altsetting[fmt->altset_idx];
314 altsd = get_iface_desc(alts);
315 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
316 return -EINVAL;
317
318 if (fmt == subs->cur_audiofmt)
319 return 0;
320
321 /* close the old interface */
322 if (subs->interface >= 0 && subs->interface != fmt->iface) {
323 err = usb_set_interface(subs->dev, subs->interface, 0);
324 if (err < 0) {
325 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
326 dev->devnum, fmt->iface, fmt->altsetting, err);
327 return -EIO;
328 }
329 subs->interface = -1;
330 subs->altset_idx = 0;
331 }
332
333 /* set interface */
334 if (subs->interface != fmt->iface ||
335 subs->altset_idx != fmt->altset_idx) {
336 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
337 if (err < 0) {
338 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
339 dev->devnum, fmt->iface, fmt->altsetting, err);
340 return -EIO;
341 }
342 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
343 fmt->iface, fmt->altsetting);
344 subs->interface = fmt->iface;
345 subs->altset_idx = fmt->altset_idx;
346 }
347
348 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
349 alts, fmt->endpoint, subs->direction,
350 SND_USB_ENDPOINT_TYPE_DATA);
351 if (!subs->data_endpoint)
352 return -EINVAL;
353
354 /* we need a sync pipe in async OUT or adaptive IN mode */
355 /* check the number of EP, since some devices have broken
356 * descriptors which fool us. if it has only one EP,
357 * assume it as adaptive-out or sync-in.
358 */
359 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
360
361 switch (subs->stream->chip->usb_id) {
362 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
363 case USB_ID(0x0763, 0x2081):
364 if (is_playback) {
365 implicit_fb = 1;
366 ep = 0x81;
367 iface = usb_ifnum_to_if(dev, 2);
368
369 if (!iface || iface->num_altsetting == 0)
370 return -EINVAL;
371
372 alts = &iface->altsetting[1];
373 goto add_sync_ep;
374 }
375 }
376
377 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
378 (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
379 altsd->bNumEndpoints >= 2) {
380 /* check sync-pipe endpoint */
381 /* ... and check descriptor size before accessing bSynchAddress
382 because there is a version of the SB Audigy 2 NX firmware lacking
383 the audio fields in the endpoint descriptors */
384 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
385 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
386 get_endpoint(alts, 1)->bSynchAddress != 0 &&
387 !implicit_fb)) {
388 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
389 dev->devnum, fmt->iface, fmt->altsetting,
390 get_endpoint(alts, 1)->bmAttributes,
391 get_endpoint(alts, 1)->bLength,
392 get_endpoint(alts, 1)->bSynchAddress);
393 return -EINVAL;
394 }
395 ep = get_endpoint(alts, 1)->bEndpointAddress;
396 if (!implicit_fb &&
397 get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
398 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
399 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
400 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
401 dev->devnum, fmt->iface, fmt->altsetting,
402 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
403 return -EINVAL;
404 }
405
406 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
407 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
408
409 add_sync_ep:
410 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
411 alts, ep, !subs->direction,
412 implicit_fb ?
413 SND_USB_ENDPOINT_TYPE_DATA :
414 SND_USB_ENDPOINT_TYPE_SYNC);
415 if (!subs->sync_endpoint)
416 return -EINVAL;
417
418 subs->data_endpoint->sync_master = subs->sync_endpoint;
419 }
420
421 if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
422 return err;
423
424 subs->cur_audiofmt = fmt;
425
426 snd_usb_set_format_quirk(subs, fmt);
427
428 #if 0
429 printk(KERN_DEBUG
430 "setting done: format = %d, rate = %d..%d, channels = %d\n",
431 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
432 printk(KERN_DEBUG
433 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
434 subs->datapipe, subs->syncpipe);
435 #endif
436
437 return 0;
438 }
439
440 /*
441 * configure endpoint params
442 *
443 * called during initial setup and upon resume
444 */
445 static int configure_endpoint(struct snd_usb_substream *subs)
446 {
447 int ret;
448
449 /* format changed */
450 stop_endpoints(subs, 0, 0, 0);
451 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
452 subs->pcm_format,
453 subs->channels,
454 subs->period_bytes,
455 subs->cur_rate,
456 subs->cur_audiofmt,
457 subs->sync_endpoint);
458 if (ret < 0)
459 return ret;
460
461 if (subs->sync_endpoint)
462 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
463 subs->pcm_format,
464 subs->channels,
465 subs->period_bytes,
466 subs->cur_rate,
467 subs->cur_audiofmt,
468 NULL);
469 return ret;
470 }
471
472 /*
473 * hw_params callback
474 *
475 * allocate a buffer and set the given audio format.
476 *
477 * so far we use a physically linear buffer although packetize transfer
478 * doesn't need a continuous area.
479 * if sg buffer is supported on the later version of alsa, we'll follow
480 * that.
481 */
482 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
483 struct snd_pcm_hw_params *hw_params)
484 {
485 struct snd_usb_substream *subs = substream->runtime->private_data;
486 struct audioformat *fmt;
487 int ret;
488
489 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
490 params_buffer_bytes(hw_params));
491 if (ret < 0)
492 return ret;
493
494 subs->pcm_format = params_format(hw_params);
495 subs->period_bytes = params_period_bytes(hw_params);
496 subs->channels = params_channels(hw_params);
497 subs->cur_rate = params_rate(hw_params);
498
499 fmt = find_format(subs);
500 if (!fmt) {
501 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
502 subs->pcm_format, subs->cur_rate, subs->channels);
503 return -EINVAL;
504 }
505
506 mutex_lock(&subs->stream->chip->shutdown_mutex);
507 if (subs->stream->chip->shutdown)
508 ret = -ENODEV;
509 else
510 ret = set_format(subs, fmt);
511 mutex_unlock(&subs->stream->chip->shutdown_mutex);
512 if (ret < 0)
513 return ret;
514
515 subs->interface = fmt->iface;
516 subs->altset_idx = fmt->altset_idx;
517 subs->need_setup_ep = true;
518
519 return 0;
520 }
521
522 /*
523 * hw_free callback
524 *
525 * reset the audio format and release the buffer
526 */
527 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
528 {
529 struct snd_usb_substream *subs = substream->runtime->private_data;
530
531 subs->cur_audiofmt = NULL;
532 subs->cur_rate = 0;
533 subs->period_bytes = 0;
534 mutex_lock(&subs->stream->chip->shutdown_mutex);
535 if (!subs->stream->chip->shutdown) {
536 stop_endpoints(subs, 0, 1, 1);
537 deactivate_endpoints(subs);
538 }
539 mutex_unlock(&subs->stream->chip->shutdown_mutex);
540 return snd_pcm_lib_free_vmalloc_buffer(substream);
541 }
542
543 /*
544 * prepare callback
545 *
546 * only a few subtle things...
547 */
548 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
549 {
550 struct snd_pcm_runtime *runtime = substream->runtime;
551 struct snd_usb_substream *subs = runtime->private_data;
552 struct usb_host_interface *alts;
553 struct usb_interface *iface;
554 int ret;
555
556 if (! subs->cur_audiofmt) {
557 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
558 return -ENXIO;
559 }
560
561 mutex_lock(&subs->stream->chip->shutdown_mutex);
562 if (subs->stream->chip->shutdown) {
563 ret = -ENODEV;
564 goto unlock;
565 }
566 if (snd_BUG_ON(!subs->data_endpoint)) {
567 ret = -EIO;
568 goto unlock;
569 }
570
571 ret = set_format(subs, subs->cur_audiofmt);
572 if (ret < 0)
573 goto unlock;
574
575 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
576 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
577 ret = snd_usb_init_sample_rate(subs->stream->chip,
578 subs->cur_audiofmt->iface,
579 alts,
580 subs->cur_audiofmt,
581 subs->cur_rate);
582 if (ret < 0)
583 goto unlock;
584
585 if (subs->need_setup_ep) {
586 ret = configure_endpoint(subs);
587 if (ret < 0)
588 goto unlock;
589 subs->need_setup_ep = false;
590 }
591
592 /* some unit conversions in runtime */
593 subs->data_endpoint->maxframesize =
594 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
595 subs->data_endpoint->curframesize =
596 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
597
598 /* reset the pointer */
599 subs->hwptr_done = 0;
600 subs->transfer_done = 0;
601 subs->last_delay = 0;
602 subs->last_frame_number = 0;
603 runtime->delay = 0;
604
605 /* for playback, submit the URBs now; otherwise, the first hwptr_done
606 * updates for all URBs would happen at the same time when starting */
607 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
608 ret = start_endpoints(subs, 1);
609
610 unlock:
611 mutex_unlock(&subs->stream->chip->shutdown_mutex);
612 return ret;
613 }
614
615 static struct snd_pcm_hardware snd_usb_hardware =
616 {
617 .info = SNDRV_PCM_INFO_MMAP |
618 SNDRV_PCM_INFO_MMAP_VALID |
619 SNDRV_PCM_INFO_BATCH |
620 SNDRV_PCM_INFO_INTERLEAVED |
621 SNDRV_PCM_INFO_BLOCK_TRANSFER |
622 SNDRV_PCM_INFO_PAUSE,
623 .buffer_bytes_max = 1024 * 1024,
624 .period_bytes_min = 64,
625 .period_bytes_max = 512 * 1024,
626 .periods_min = 2,
627 .periods_max = 1024,
628 };
629
630 static int hw_check_valid_format(struct snd_usb_substream *subs,
631 struct snd_pcm_hw_params *params,
632 struct audioformat *fp)
633 {
634 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
635 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
636 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
637 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
638 struct snd_mask check_fmts;
639 unsigned int ptime;
640
641 /* check the format */
642 snd_mask_none(&check_fmts);
643 check_fmts.bits[0] = (u32)fp->formats;
644 check_fmts.bits[1] = (u32)(fp->formats >> 32);
645 snd_mask_intersect(&check_fmts, fmts);
646 if (snd_mask_empty(&check_fmts)) {
647 hwc_debug(" > check: no supported format %d\n", fp->format);
648 return 0;
649 }
650 /* check the channels */
651 if (fp->channels < ct->min || fp->channels > ct->max) {
652 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
653 return 0;
654 }
655 /* check the rate is within the range */
656 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
657 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
658 return 0;
659 }
660 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
661 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
662 return 0;
663 }
664 /* check whether the period time is >= the data packet interval */
665 if (subs->speed != USB_SPEED_FULL) {
666 ptime = 125 * (1 << fp->datainterval);
667 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
668 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
669 return 0;
670 }
671 }
672 return 1;
673 }
674
675 static int hw_rule_rate(struct snd_pcm_hw_params *params,
676 struct snd_pcm_hw_rule *rule)
677 {
678 struct snd_usb_substream *subs = rule->private;
679 struct list_head *p;
680 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
681 unsigned int rmin, rmax;
682 int changed;
683
684 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
685 changed = 0;
686 rmin = rmax = 0;
687 list_for_each(p, &subs->fmt_list) {
688 struct audioformat *fp;
689 fp = list_entry(p, struct audioformat, list);
690 if (!hw_check_valid_format(subs, params, fp))
691 continue;
692 if (changed++) {
693 if (rmin > fp->rate_min)
694 rmin = fp->rate_min;
695 if (rmax < fp->rate_max)
696 rmax = fp->rate_max;
697 } else {
698 rmin = fp->rate_min;
699 rmax = fp->rate_max;
700 }
701 }
702
703 if (!changed) {
704 hwc_debug(" --> get empty\n");
705 it->empty = 1;
706 return -EINVAL;
707 }
708
709 changed = 0;
710 if (it->min < rmin) {
711 it->min = rmin;
712 it->openmin = 0;
713 changed = 1;
714 }
715 if (it->max > rmax) {
716 it->max = rmax;
717 it->openmax = 0;
718 changed = 1;
719 }
720 if (snd_interval_checkempty(it)) {
721 it->empty = 1;
722 return -EINVAL;
723 }
724 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
725 return changed;
726 }
727
728
729 static int hw_rule_channels(struct snd_pcm_hw_params *params,
730 struct snd_pcm_hw_rule *rule)
731 {
732 struct snd_usb_substream *subs = rule->private;
733 struct list_head *p;
734 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
735 unsigned int rmin, rmax;
736 int changed;
737
738 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
739 changed = 0;
740 rmin = rmax = 0;
741 list_for_each(p, &subs->fmt_list) {
742 struct audioformat *fp;
743 fp = list_entry(p, struct audioformat, list);
744 if (!hw_check_valid_format(subs, params, fp))
745 continue;
746 if (changed++) {
747 if (rmin > fp->channels)
748 rmin = fp->channels;
749 if (rmax < fp->channels)
750 rmax = fp->channels;
751 } else {
752 rmin = fp->channels;
753 rmax = fp->channels;
754 }
755 }
756
757 if (!changed) {
758 hwc_debug(" --> get empty\n");
759 it->empty = 1;
760 return -EINVAL;
761 }
762
763 changed = 0;
764 if (it->min < rmin) {
765 it->min = rmin;
766 it->openmin = 0;
767 changed = 1;
768 }
769 if (it->max > rmax) {
770 it->max = rmax;
771 it->openmax = 0;
772 changed = 1;
773 }
774 if (snd_interval_checkempty(it)) {
775 it->empty = 1;
776 return -EINVAL;
777 }
778 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
779 return changed;
780 }
781
782 static int hw_rule_format(struct snd_pcm_hw_params *params,
783 struct snd_pcm_hw_rule *rule)
784 {
785 struct snd_usb_substream *subs = rule->private;
786 struct list_head *p;
787 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
788 u64 fbits;
789 u32 oldbits[2];
790 int changed;
791
792 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
793 fbits = 0;
794 list_for_each(p, &subs->fmt_list) {
795 struct audioformat *fp;
796 fp = list_entry(p, struct audioformat, list);
797 if (!hw_check_valid_format(subs, params, fp))
798 continue;
799 fbits |= fp->formats;
800 }
801
802 oldbits[0] = fmt->bits[0];
803 oldbits[1] = fmt->bits[1];
804 fmt->bits[0] &= (u32)fbits;
805 fmt->bits[1] &= (u32)(fbits >> 32);
806 if (!fmt->bits[0] && !fmt->bits[1]) {
807 hwc_debug(" --> get empty\n");
808 return -EINVAL;
809 }
810 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
811 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
812 return changed;
813 }
814
815 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
816 struct snd_pcm_hw_rule *rule)
817 {
818 struct snd_usb_substream *subs = rule->private;
819 struct audioformat *fp;
820 struct snd_interval *it;
821 unsigned char min_datainterval;
822 unsigned int pmin;
823 int changed;
824
825 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
826 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
827 min_datainterval = 0xff;
828 list_for_each_entry(fp, &subs->fmt_list, list) {
829 if (!hw_check_valid_format(subs, params, fp))
830 continue;
831 min_datainterval = min(min_datainterval, fp->datainterval);
832 }
833 if (min_datainterval == 0xff) {
834 hwc_debug(" --> get empty\n");
835 it->empty = 1;
836 return -EINVAL;
837 }
838 pmin = 125 * (1 << min_datainterval);
839 changed = 0;
840 if (it->min < pmin) {
841 it->min = pmin;
842 it->openmin = 0;
843 changed = 1;
844 }
845 if (snd_interval_checkempty(it)) {
846 it->empty = 1;
847 return -EINVAL;
848 }
849 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
850 return changed;
851 }
852
853 /*
854 * If the device supports unusual bit rates, does the request meet these?
855 */
856 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
857 struct snd_usb_substream *subs)
858 {
859 struct audioformat *fp;
860 int *rate_list;
861 int count = 0, needs_knot = 0;
862 int err;
863
864 kfree(subs->rate_list.list);
865 subs->rate_list.list = NULL;
866
867 list_for_each_entry(fp, &subs->fmt_list, list) {
868 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
869 return 0;
870 count += fp->nr_rates;
871 if (fp->rates & SNDRV_PCM_RATE_KNOT)
872 needs_knot = 1;
873 }
874 if (!needs_knot)
875 return 0;
876
877 subs->rate_list.list = rate_list =
878 kmalloc(sizeof(int) * count, GFP_KERNEL);
879 if (!subs->rate_list.list)
880 return -ENOMEM;
881 subs->rate_list.count = count;
882 subs->rate_list.mask = 0;
883 count = 0;
884 list_for_each_entry(fp, &subs->fmt_list, list) {
885 int i;
886 for (i = 0; i < fp->nr_rates; i++)
887 rate_list[count++] = fp->rate_table[i];
888 }
889 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
890 &subs->rate_list);
891 if (err < 0)
892 return err;
893
894 return 0;
895 }
896
897
898 /*
899 * set up the runtime hardware information.
900 */
901
902 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
903 {
904 struct list_head *p;
905 unsigned int pt, ptmin;
906 int param_period_time_if_needed;
907 int err;
908
909 runtime->hw.formats = subs->formats;
910
911 runtime->hw.rate_min = 0x7fffffff;
912 runtime->hw.rate_max = 0;
913 runtime->hw.channels_min = 256;
914 runtime->hw.channels_max = 0;
915 runtime->hw.rates = 0;
916 ptmin = UINT_MAX;
917 /* check min/max rates and channels */
918 list_for_each(p, &subs->fmt_list) {
919 struct audioformat *fp;
920 fp = list_entry(p, struct audioformat, list);
921 runtime->hw.rates |= fp->rates;
922 if (runtime->hw.rate_min > fp->rate_min)
923 runtime->hw.rate_min = fp->rate_min;
924 if (runtime->hw.rate_max < fp->rate_max)
925 runtime->hw.rate_max = fp->rate_max;
926 if (runtime->hw.channels_min > fp->channels)
927 runtime->hw.channels_min = fp->channels;
928 if (runtime->hw.channels_max < fp->channels)
929 runtime->hw.channels_max = fp->channels;
930 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
931 /* FIXME: there might be more than one audio formats... */
932 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
933 fp->frame_size;
934 }
935 pt = 125 * (1 << fp->datainterval);
936 ptmin = min(ptmin, pt);
937 }
938 err = snd_usb_autoresume(subs->stream->chip);
939 if (err < 0)
940 return err;
941
942 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
943 if (subs->speed == USB_SPEED_FULL)
944 /* full speed devices have fixed data packet interval */
945 ptmin = 1000;
946 if (ptmin == 1000)
947 /* if period time doesn't go below 1 ms, no rules needed */
948 param_period_time_if_needed = -1;
949 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
950 ptmin, UINT_MAX);
951
952 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
953 hw_rule_rate, subs,
954 SNDRV_PCM_HW_PARAM_FORMAT,
955 SNDRV_PCM_HW_PARAM_CHANNELS,
956 param_period_time_if_needed,
957 -1)) < 0)
958 goto rep_err;
959 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
960 hw_rule_channels, subs,
961 SNDRV_PCM_HW_PARAM_FORMAT,
962 SNDRV_PCM_HW_PARAM_RATE,
963 param_period_time_if_needed,
964 -1)) < 0)
965 goto rep_err;
966 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
967 hw_rule_format, subs,
968 SNDRV_PCM_HW_PARAM_RATE,
969 SNDRV_PCM_HW_PARAM_CHANNELS,
970 param_period_time_if_needed,
971 -1)) < 0)
972 goto rep_err;
973 if (param_period_time_if_needed >= 0) {
974 err = snd_pcm_hw_rule_add(runtime, 0,
975 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
976 hw_rule_period_time, subs,
977 SNDRV_PCM_HW_PARAM_FORMAT,
978 SNDRV_PCM_HW_PARAM_CHANNELS,
979 SNDRV_PCM_HW_PARAM_RATE,
980 -1);
981 if (err < 0)
982 goto rep_err;
983 }
984 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
985 goto rep_err;
986 return 0;
987
988 rep_err:
989 snd_usb_autosuspend(subs->stream->chip);
990 return err;
991 }
992
993 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
994 {
995 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
996 struct snd_pcm_runtime *runtime = substream->runtime;
997 struct snd_usb_substream *subs = &as->substream[direction];
998
999 subs->interface = -1;
1000 subs->altset_idx = 0;
1001 runtime->hw = snd_usb_hardware;
1002 runtime->private_data = subs;
1003 subs->pcm_substream = substream;
1004 /* runtime PM is also done there */
1005 return setup_hw_info(runtime, subs);
1006 }
1007
1008 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1009 {
1010 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1011 struct snd_usb_substream *subs = &as->substream[direction];
1012
1013 stop_endpoints(subs, 0, 0, 0);
1014
1015 if (!as->chip->shutdown && subs->interface >= 0) {
1016 usb_set_interface(subs->dev, subs->interface, 0);
1017 subs->interface = -1;
1018 }
1019
1020 subs->pcm_substream = NULL;
1021 snd_usb_autosuspend(subs->stream->chip);
1022
1023 return 0;
1024 }
1025
1026 /* Since a URB can handle only a single linear buffer, we must use double
1027 * buffering when the data to be transferred overflows the buffer boundary.
1028 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1029 * for all URBs.
1030 */
1031 static void retire_capture_urb(struct snd_usb_substream *subs,
1032 struct urb *urb)
1033 {
1034 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1035 unsigned int stride, frames, bytes, oldptr;
1036 int i, period_elapsed = 0;
1037 unsigned long flags;
1038 unsigned char *cp;
1039
1040 stride = runtime->frame_bits >> 3;
1041
1042 for (i = 0; i < urb->number_of_packets; i++) {
1043 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1044 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1045 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1046 // continue;
1047 }
1048 bytes = urb->iso_frame_desc[i].actual_length;
1049 frames = bytes / stride;
1050 if (!subs->txfr_quirk)
1051 bytes = frames * stride;
1052 if (bytes % (runtime->sample_bits >> 3) != 0) {
1053 #ifdef CONFIG_SND_DEBUG_VERBOSE
1054 int oldbytes = bytes;
1055 #endif
1056 bytes = frames * stride;
1057 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1058 oldbytes, bytes);
1059 }
1060 /* update the current pointer */
1061 spin_lock_irqsave(&subs->lock, flags);
1062 oldptr = subs->hwptr_done;
1063 subs->hwptr_done += bytes;
1064 if (subs->hwptr_done >= runtime->buffer_size * stride)
1065 subs->hwptr_done -= runtime->buffer_size * stride;
1066 frames = (bytes + (oldptr % stride)) / stride;
1067 subs->transfer_done += frames;
1068 if (subs->transfer_done >= runtime->period_size) {
1069 subs->transfer_done -= runtime->period_size;
1070 period_elapsed = 1;
1071 }
1072 spin_unlock_irqrestore(&subs->lock, flags);
1073 /* copy a data chunk */
1074 if (oldptr + bytes > runtime->buffer_size * stride) {
1075 unsigned int bytes1 =
1076 runtime->buffer_size * stride - oldptr;
1077 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1078 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1079 } else {
1080 memcpy(runtime->dma_area + oldptr, cp, bytes);
1081 }
1082 }
1083
1084 if (period_elapsed)
1085 snd_pcm_period_elapsed(subs->pcm_substream);
1086 }
1087
1088 static void prepare_playback_urb(struct snd_usb_substream *subs,
1089 struct urb *urb)
1090 {
1091 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1092 struct snd_usb_endpoint *ep = subs->data_endpoint;
1093 struct snd_urb_ctx *ctx = urb->context;
1094 unsigned int counts, frames, bytes;
1095 int i, stride, period_elapsed = 0;
1096 unsigned long flags;
1097
1098 stride = runtime->frame_bits >> 3;
1099
1100 frames = 0;
1101 urb->number_of_packets = 0;
1102 spin_lock_irqsave(&subs->lock, flags);
1103 for (i = 0; i < ctx->packets; i++) {
1104 if (ctx->packet_size[i])
1105 counts = ctx->packet_size[i];
1106 else
1107 counts = snd_usb_endpoint_next_packet_size(ep);
1108
1109 /* set up descriptor */
1110 urb->iso_frame_desc[i].offset = frames * stride;
1111 urb->iso_frame_desc[i].length = counts * stride;
1112 frames += counts;
1113 urb->number_of_packets++;
1114 subs->transfer_done += counts;
1115 if (subs->transfer_done >= runtime->period_size) {
1116 subs->transfer_done -= runtime->period_size;
1117 period_elapsed = 1;
1118 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1119 if (subs->transfer_done > 0) {
1120 /* FIXME: fill-max mode is not
1121 * supported yet */
1122 frames -= subs->transfer_done;
1123 counts -= subs->transfer_done;
1124 urb->iso_frame_desc[i].length =
1125 counts * stride;
1126 subs->transfer_done = 0;
1127 }
1128 i++;
1129 if (i < ctx->packets) {
1130 /* add a transfer delimiter */
1131 urb->iso_frame_desc[i].offset =
1132 frames * stride;
1133 urb->iso_frame_desc[i].length = 0;
1134 urb->number_of_packets++;
1135 }
1136 break;
1137 }
1138 }
1139 if (period_elapsed &&
1140 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1141 break;
1142 }
1143 bytes = frames * stride;
1144 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1145 /* err, the transferred area goes over buffer boundary. */
1146 unsigned int bytes1 =
1147 runtime->buffer_size * stride - subs->hwptr_done;
1148 memcpy(urb->transfer_buffer,
1149 runtime->dma_area + subs->hwptr_done, bytes1);
1150 memcpy(urb->transfer_buffer + bytes1,
1151 runtime->dma_area, bytes - bytes1);
1152 } else {
1153 memcpy(urb->transfer_buffer,
1154 runtime->dma_area + subs->hwptr_done, bytes);
1155 }
1156 subs->hwptr_done += bytes;
1157 if (subs->hwptr_done >= runtime->buffer_size * stride)
1158 subs->hwptr_done -= runtime->buffer_size * stride;
1159
1160 /* update delay with exact number of samples queued */
1161 runtime->delay = subs->last_delay;
1162 runtime->delay += frames;
1163 subs->last_delay = runtime->delay;
1164
1165 /* realign last_frame_number */
1166 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1167 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1168
1169 spin_unlock_irqrestore(&subs->lock, flags);
1170 urb->transfer_buffer_length = bytes;
1171 if (period_elapsed)
1172 snd_pcm_period_elapsed(subs->pcm_substream);
1173 }
1174
1175 /*
1176 * process after playback data complete
1177 * - decrease the delay count again
1178 */
1179 static void retire_playback_urb(struct snd_usb_substream *subs,
1180 struct urb *urb)
1181 {
1182 unsigned long flags;
1183 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1184 int stride = runtime->frame_bits >> 3;
1185 int processed = urb->transfer_buffer_length / stride;
1186 int est_delay;
1187
1188 /* ignore the delay accounting when procssed=0 is given, i.e.
1189 * silent payloads are procssed before handling the actual data
1190 */
1191 if (!processed)
1192 return;
1193
1194 spin_lock_irqsave(&subs->lock, flags);
1195 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1196 /* update delay with exact number of samples played */
1197 if (processed > subs->last_delay)
1198 subs->last_delay = 0;
1199 else
1200 subs->last_delay -= processed;
1201 runtime->delay = subs->last_delay;
1202
1203 /*
1204 * Report when delay estimate is off by more than 2ms.
1205 * The error should be lower than 2ms since the estimate relies
1206 * on two reads of a counter updated every ms.
1207 */
1208 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1209 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1210 est_delay, subs->last_delay);
1211
1212 spin_unlock_irqrestore(&subs->lock, flags);
1213 }
1214
1215 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1216 {
1217 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1218 }
1219
1220 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1221 {
1222 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1223 }
1224
1225 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1226 {
1227 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1228 }
1229
1230 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1231 {
1232 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1233 }
1234
1235 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1236 int cmd)
1237 {
1238 struct snd_usb_substream *subs = substream->runtime->private_data;
1239
1240 switch (cmd) {
1241 case SNDRV_PCM_TRIGGER_START:
1242 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1243 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1244 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1245 subs->running = 1;
1246 return 0;
1247 case SNDRV_PCM_TRIGGER_STOP:
1248 stop_endpoints(subs, 0, 0, 0);
1249 subs->running = 0;
1250 return 0;
1251 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1252 subs->data_endpoint->prepare_data_urb = NULL;
1253 subs->data_endpoint->retire_data_urb = NULL;
1254 subs->running = 0;
1255 return 0;
1256 }
1257
1258 return -EINVAL;
1259 }
1260
1261 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1262 int cmd)
1263 {
1264 int err;
1265 struct snd_usb_substream *subs = substream->runtime->private_data;
1266
1267 switch (cmd) {
1268 case SNDRV_PCM_TRIGGER_START:
1269 err = start_endpoints(subs, 0);
1270 if (err < 0)
1271 return err;
1272
1273 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1274 subs->running = 1;
1275 return 0;
1276 case SNDRV_PCM_TRIGGER_STOP:
1277 stop_endpoints(subs, 0, 0, 0);
1278 subs->running = 0;
1279 return 0;
1280 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1281 subs->data_endpoint->retire_data_urb = NULL;
1282 subs->running = 0;
1283 return 0;
1284 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1285 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1286 subs->running = 1;
1287 return 0;
1288 }
1289
1290 return -EINVAL;
1291 }
1292
1293 static struct snd_pcm_ops snd_usb_playback_ops = {
1294 .open = snd_usb_playback_open,
1295 .close = snd_usb_playback_close,
1296 .ioctl = snd_pcm_lib_ioctl,
1297 .hw_params = snd_usb_hw_params,
1298 .hw_free = snd_usb_hw_free,
1299 .prepare = snd_usb_pcm_prepare,
1300 .trigger = snd_usb_substream_playback_trigger,
1301 .pointer = snd_usb_pcm_pointer,
1302 .page = snd_pcm_lib_get_vmalloc_page,
1303 .mmap = snd_pcm_lib_mmap_vmalloc,
1304 };
1305
1306 static struct snd_pcm_ops snd_usb_capture_ops = {
1307 .open = snd_usb_capture_open,
1308 .close = snd_usb_capture_close,
1309 .ioctl = snd_pcm_lib_ioctl,
1310 .hw_params = snd_usb_hw_params,
1311 .hw_free = snd_usb_hw_free,
1312 .prepare = snd_usb_pcm_prepare,
1313 .trigger = snd_usb_substream_capture_trigger,
1314 .pointer = snd_usb_pcm_pointer,
1315 .page = snd_pcm_lib_get_vmalloc_page,
1316 .mmap = snd_pcm_lib_mmap_vmalloc,
1317 };
1318
1319 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1320 {
1321 snd_pcm_set_ops(pcm, stream,
1322 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1323 &snd_usb_playback_ops : &snd_usb_capture_ops);
1324 }
Linux kernel - Deliverables
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