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Merge tag 'imx-fixes-rc' of git://git.pengutronix.de/git/imx/linux-2.6 into fixes
[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 down_read(&subs->stream->chip->shutdown_rwsem);
507 if (subs->stream->chip->shutdown)
508 ret = -ENODEV;
509 else
510 ret = set_format(subs, fmt);
511 up_read(&subs->stream->chip->shutdown_rwsem);
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 down_read(&subs->stream->chip->shutdown_rwsem);
535 if (!subs->stream->chip->shutdown) {
536 stop_endpoints(subs, 0, 1, 1);
537 deactivate_endpoints(subs);
538 }
539 up_read(&subs->stream->chip->shutdown_rwsem);
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 down_read(&subs->stream->chip->shutdown_rwsem);
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 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
572 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
573
574 ret = set_format(subs, subs->cur_audiofmt);
575 if (ret < 0)
576 goto unlock;
577
578 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
579 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
580 ret = snd_usb_init_sample_rate(subs->stream->chip,
581 subs->cur_audiofmt->iface,
582 alts,
583 subs->cur_audiofmt,
584 subs->cur_rate);
585 if (ret < 0)
586 goto unlock;
587
588 if (subs->need_setup_ep) {
589 ret = configure_endpoint(subs);
590 if (ret < 0)
591 goto unlock;
592 subs->need_setup_ep = false;
593 }
594
595 /* some unit conversions in runtime */
596 subs->data_endpoint->maxframesize =
597 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
598 subs->data_endpoint->curframesize =
599 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
600
601 /* reset the pointer */
602 subs->hwptr_done = 0;
603 subs->transfer_done = 0;
604 subs->last_delay = 0;
605 subs->last_frame_number = 0;
606 runtime->delay = 0;
607
608 /* for playback, submit the URBs now; otherwise, the first hwptr_done
609 * updates for all URBs would happen at the same time when starting */
610 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
611 ret = start_endpoints(subs, 1);
612
613 unlock:
614 up_read(&subs->stream->chip->shutdown_rwsem);
615 return ret;
616 }
617
618 static struct snd_pcm_hardware snd_usb_hardware =
619 {
620 .info = SNDRV_PCM_INFO_MMAP |
621 SNDRV_PCM_INFO_MMAP_VALID |
622 SNDRV_PCM_INFO_BATCH |
623 SNDRV_PCM_INFO_INTERLEAVED |
624 SNDRV_PCM_INFO_BLOCK_TRANSFER |
625 SNDRV_PCM_INFO_PAUSE,
626 .buffer_bytes_max = 1024 * 1024,
627 .period_bytes_min = 64,
628 .period_bytes_max = 512 * 1024,
629 .periods_min = 2,
630 .periods_max = 1024,
631 };
632
633 static int hw_check_valid_format(struct snd_usb_substream *subs,
634 struct snd_pcm_hw_params *params,
635 struct audioformat *fp)
636 {
637 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
638 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
639 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
640 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
641 struct snd_mask check_fmts;
642 unsigned int ptime;
643
644 /* check the format */
645 snd_mask_none(&check_fmts);
646 check_fmts.bits[0] = (u32)fp->formats;
647 check_fmts.bits[1] = (u32)(fp->formats >> 32);
648 snd_mask_intersect(&check_fmts, fmts);
649 if (snd_mask_empty(&check_fmts)) {
650 hwc_debug(" > check: no supported format %d\n", fp->format);
651 return 0;
652 }
653 /* check the channels */
654 if (fp->channels < ct->min || fp->channels > ct->max) {
655 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
656 return 0;
657 }
658 /* check the rate is within the range */
659 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
660 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
661 return 0;
662 }
663 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
664 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
665 return 0;
666 }
667 /* check whether the period time is >= the data packet interval */
668 if (subs->speed != USB_SPEED_FULL) {
669 ptime = 125 * (1 << fp->datainterval);
670 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
671 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
672 return 0;
673 }
674 }
675 return 1;
676 }
677
678 static int hw_rule_rate(struct snd_pcm_hw_params *params,
679 struct snd_pcm_hw_rule *rule)
680 {
681 struct snd_usb_substream *subs = rule->private;
682 struct list_head *p;
683 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
684 unsigned int rmin, rmax;
685 int changed;
686
687 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
688 changed = 0;
689 rmin = rmax = 0;
690 list_for_each(p, &subs->fmt_list) {
691 struct audioformat *fp;
692 fp = list_entry(p, struct audioformat, list);
693 if (!hw_check_valid_format(subs, params, fp))
694 continue;
695 if (changed++) {
696 if (rmin > fp->rate_min)
697 rmin = fp->rate_min;
698 if (rmax < fp->rate_max)
699 rmax = fp->rate_max;
700 } else {
701 rmin = fp->rate_min;
702 rmax = fp->rate_max;
703 }
704 }
705
706 if (!changed) {
707 hwc_debug(" --> get empty\n");
708 it->empty = 1;
709 return -EINVAL;
710 }
711
712 changed = 0;
713 if (it->min < rmin) {
714 it->min = rmin;
715 it->openmin = 0;
716 changed = 1;
717 }
718 if (it->max > rmax) {
719 it->max = rmax;
720 it->openmax = 0;
721 changed = 1;
722 }
723 if (snd_interval_checkempty(it)) {
724 it->empty = 1;
725 return -EINVAL;
726 }
727 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
728 return changed;
729 }
730
731
732 static int hw_rule_channels(struct snd_pcm_hw_params *params,
733 struct snd_pcm_hw_rule *rule)
734 {
735 struct snd_usb_substream *subs = rule->private;
736 struct list_head *p;
737 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
738 unsigned int rmin, rmax;
739 int changed;
740
741 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
742 changed = 0;
743 rmin = rmax = 0;
744 list_for_each(p, &subs->fmt_list) {
745 struct audioformat *fp;
746 fp = list_entry(p, struct audioformat, list);
747 if (!hw_check_valid_format(subs, params, fp))
748 continue;
749 if (changed++) {
750 if (rmin > fp->channels)
751 rmin = fp->channels;
752 if (rmax < fp->channels)
753 rmax = fp->channels;
754 } else {
755 rmin = fp->channels;
756 rmax = fp->channels;
757 }
758 }
759
760 if (!changed) {
761 hwc_debug(" --> get empty\n");
762 it->empty = 1;
763 return -EINVAL;
764 }
765
766 changed = 0;
767 if (it->min < rmin) {
768 it->min = rmin;
769 it->openmin = 0;
770 changed = 1;
771 }
772 if (it->max > rmax) {
773 it->max = rmax;
774 it->openmax = 0;
775 changed = 1;
776 }
777 if (snd_interval_checkempty(it)) {
778 it->empty = 1;
779 return -EINVAL;
780 }
781 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
782 return changed;
783 }
784
785 static int hw_rule_format(struct snd_pcm_hw_params *params,
786 struct snd_pcm_hw_rule *rule)
787 {
788 struct snd_usb_substream *subs = rule->private;
789 struct list_head *p;
790 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
791 u64 fbits;
792 u32 oldbits[2];
793 int changed;
794
795 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
796 fbits = 0;
797 list_for_each(p, &subs->fmt_list) {
798 struct audioformat *fp;
799 fp = list_entry(p, struct audioformat, list);
800 if (!hw_check_valid_format(subs, params, fp))
801 continue;
802 fbits |= fp->formats;
803 }
804
805 oldbits[0] = fmt->bits[0];
806 oldbits[1] = fmt->bits[1];
807 fmt->bits[0] &= (u32)fbits;
808 fmt->bits[1] &= (u32)(fbits >> 32);
809 if (!fmt->bits[0] && !fmt->bits[1]) {
810 hwc_debug(" --> get empty\n");
811 return -EINVAL;
812 }
813 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
814 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
815 return changed;
816 }
817
818 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
819 struct snd_pcm_hw_rule *rule)
820 {
821 struct snd_usb_substream *subs = rule->private;
822 struct audioformat *fp;
823 struct snd_interval *it;
824 unsigned char min_datainterval;
825 unsigned int pmin;
826 int changed;
827
828 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
829 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
830 min_datainterval = 0xff;
831 list_for_each_entry(fp, &subs->fmt_list, list) {
832 if (!hw_check_valid_format(subs, params, fp))
833 continue;
834 min_datainterval = min(min_datainterval, fp->datainterval);
835 }
836 if (min_datainterval == 0xff) {
837 hwc_debug(" --> get empty\n");
838 it->empty = 1;
839 return -EINVAL;
840 }
841 pmin = 125 * (1 << min_datainterval);
842 changed = 0;
843 if (it->min < pmin) {
844 it->min = pmin;
845 it->openmin = 0;
846 changed = 1;
847 }
848 if (snd_interval_checkempty(it)) {
849 it->empty = 1;
850 return -EINVAL;
851 }
852 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
853 return changed;
854 }
855
856 /*
857 * If the device supports unusual bit rates, does the request meet these?
858 */
859 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
860 struct snd_usb_substream *subs)
861 {
862 struct audioformat *fp;
863 int *rate_list;
864 int count = 0, needs_knot = 0;
865 int err;
866
867 kfree(subs->rate_list.list);
868 subs->rate_list.list = NULL;
869
870 list_for_each_entry(fp, &subs->fmt_list, list) {
871 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
872 return 0;
873 count += fp->nr_rates;
874 if (fp->rates & SNDRV_PCM_RATE_KNOT)
875 needs_knot = 1;
876 }
877 if (!needs_knot)
878 return 0;
879
880 subs->rate_list.list = rate_list =
881 kmalloc(sizeof(int) * count, GFP_KERNEL);
882 if (!subs->rate_list.list)
883 return -ENOMEM;
884 subs->rate_list.count = count;
885 subs->rate_list.mask = 0;
886 count = 0;
887 list_for_each_entry(fp, &subs->fmt_list, list) {
888 int i;
889 for (i = 0; i < fp->nr_rates; i++)
890 rate_list[count++] = fp->rate_table[i];
891 }
892 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
893 &subs->rate_list);
894 if (err < 0)
895 return err;
896
897 return 0;
898 }
899
900
901 /*
902 * set up the runtime hardware information.
903 */
904
905 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
906 {
907 struct list_head *p;
908 unsigned int pt, ptmin;
909 int param_period_time_if_needed;
910 int err;
911
912 runtime->hw.formats = subs->formats;
913
914 runtime->hw.rate_min = 0x7fffffff;
915 runtime->hw.rate_max = 0;
916 runtime->hw.channels_min = 256;
917 runtime->hw.channels_max = 0;
918 runtime->hw.rates = 0;
919 ptmin = UINT_MAX;
920 /* check min/max rates and channels */
921 list_for_each(p, &subs->fmt_list) {
922 struct audioformat *fp;
923 fp = list_entry(p, struct audioformat, list);
924 runtime->hw.rates |= fp->rates;
925 if (runtime->hw.rate_min > fp->rate_min)
926 runtime->hw.rate_min = fp->rate_min;
927 if (runtime->hw.rate_max < fp->rate_max)
928 runtime->hw.rate_max = fp->rate_max;
929 if (runtime->hw.channels_min > fp->channels)
930 runtime->hw.channels_min = fp->channels;
931 if (runtime->hw.channels_max < fp->channels)
932 runtime->hw.channels_max = fp->channels;
933 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
934 /* FIXME: there might be more than one audio formats... */
935 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
936 fp->frame_size;
937 }
938 pt = 125 * (1 << fp->datainterval);
939 ptmin = min(ptmin, pt);
940 }
941 err = snd_usb_autoresume(subs->stream->chip);
942 if (err < 0)
943 return err;
944
945 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
946 if (subs->speed == USB_SPEED_FULL)
947 /* full speed devices have fixed data packet interval */
948 ptmin = 1000;
949 if (ptmin == 1000)
950 /* if period time doesn't go below 1 ms, no rules needed */
951 param_period_time_if_needed = -1;
952 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
953 ptmin, UINT_MAX);
954
955 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
956 hw_rule_rate, subs,
957 SNDRV_PCM_HW_PARAM_FORMAT,
958 SNDRV_PCM_HW_PARAM_CHANNELS,
959 param_period_time_if_needed,
960 -1)) < 0)
961 goto rep_err;
962 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
963 hw_rule_channels, subs,
964 SNDRV_PCM_HW_PARAM_FORMAT,
965 SNDRV_PCM_HW_PARAM_RATE,
966 param_period_time_if_needed,
967 -1)) < 0)
968 goto rep_err;
969 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
970 hw_rule_format, subs,
971 SNDRV_PCM_HW_PARAM_RATE,
972 SNDRV_PCM_HW_PARAM_CHANNELS,
973 param_period_time_if_needed,
974 -1)) < 0)
975 goto rep_err;
976 if (param_period_time_if_needed >= 0) {
977 err = snd_pcm_hw_rule_add(runtime, 0,
978 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
979 hw_rule_period_time, subs,
980 SNDRV_PCM_HW_PARAM_FORMAT,
981 SNDRV_PCM_HW_PARAM_CHANNELS,
982 SNDRV_PCM_HW_PARAM_RATE,
983 -1);
984 if (err < 0)
985 goto rep_err;
986 }
987 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
988 goto rep_err;
989 return 0;
990
991 rep_err:
992 snd_usb_autosuspend(subs->stream->chip);
993 return err;
994 }
995
996 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
997 {
998 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
999 struct snd_pcm_runtime *runtime = substream->runtime;
1000 struct snd_usb_substream *subs = &as->substream[direction];
1001
1002 subs->interface = -1;
1003 subs->altset_idx = 0;
1004 runtime->hw = snd_usb_hardware;
1005 runtime->private_data = subs;
1006 subs->pcm_substream = substream;
1007 /* runtime PM is also done there */
1008 return setup_hw_info(runtime, subs);
1009 }
1010
1011 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1012 {
1013 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1014 struct snd_usb_substream *subs = &as->substream[direction];
1015
1016 stop_endpoints(subs, 0, 0, 0);
1017
1018 if (!as->chip->shutdown && subs->interface >= 0) {
1019 usb_set_interface(subs->dev, subs->interface, 0);
1020 subs->interface = -1;
1021 }
1022
1023 subs->pcm_substream = NULL;
1024 snd_usb_autosuspend(subs->stream->chip);
1025
1026 return 0;
1027 }
1028
1029 /* Since a URB can handle only a single linear buffer, we must use double
1030 * buffering when the data to be transferred overflows the buffer boundary.
1031 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1032 * for all URBs.
1033 */
1034 static void retire_capture_urb(struct snd_usb_substream *subs,
1035 struct urb *urb)
1036 {
1037 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1038 unsigned int stride, frames, bytes, oldptr;
1039 int i, period_elapsed = 0;
1040 unsigned long flags;
1041 unsigned char *cp;
1042
1043 stride = runtime->frame_bits >> 3;
1044
1045 for (i = 0; i < urb->number_of_packets; i++) {
1046 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1047 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1048 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1049 // continue;
1050 }
1051 bytes = urb->iso_frame_desc[i].actual_length;
1052 frames = bytes / stride;
1053 if (!subs->txfr_quirk)
1054 bytes = frames * stride;
1055 if (bytes % (runtime->sample_bits >> 3) != 0) {
1056 #ifdef CONFIG_SND_DEBUG_VERBOSE
1057 int oldbytes = bytes;
1058 #endif
1059 bytes = frames * stride;
1060 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1061 oldbytes, bytes);
1062 }
1063 /* update the current pointer */
1064 spin_lock_irqsave(&subs->lock, flags);
1065 oldptr = subs->hwptr_done;
1066 subs->hwptr_done += bytes;
1067 if (subs->hwptr_done >= runtime->buffer_size * stride)
1068 subs->hwptr_done -= runtime->buffer_size * stride;
1069 frames = (bytes + (oldptr % stride)) / stride;
1070 subs->transfer_done += frames;
1071 if (subs->transfer_done >= runtime->period_size) {
1072 subs->transfer_done -= runtime->period_size;
1073 period_elapsed = 1;
1074 }
1075 spin_unlock_irqrestore(&subs->lock, flags);
1076 /* copy a data chunk */
1077 if (oldptr + bytes > runtime->buffer_size * stride) {
1078 unsigned int bytes1 =
1079 runtime->buffer_size * stride - oldptr;
1080 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1081 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1082 } else {
1083 memcpy(runtime->dma_area + oldptr, cp, bytes);
1084 }
1085 }
1086
1087 if (period_elapsed)
1088 snd_pcm_period_elapsed(subs->pcm_substream);
1089 }
1090
1091 static void prepare_playback_urb(struct snd_usb_substream *subs,
1092 struct urb *urb)
1093 {
1094 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1095 struct snd_usb_endpoint *ep = subs->data_endpoint;
1096 struct snd_urb_ctx *ctx = urb->context;
1097 unsigned int counts, frames, bytes;
1098 int i, stride, period_elapsed = 0;
1099 unsigned long flags;
1100
1101 stride = runtime->frame_bits >> 3;
1102
1103 frames = 0;
1104 urb->number_of_packets = 0;
1105 spin_lock_irqsave(&subs->lock, flags);
1106 for (i = 0; i < ctx->packets; i++) {
1107 if (ctx->packet_size[i])
1108 counts = ctx->packet_size[i];
1109 else
1110 counts = snd_usb_endpoint_next_packet_size(ep);
1111
1112 /* set up descriptor */
1113 urb->iso_frame_desc[i].offset = frames * stride;
1114 urb->iso_frame_desc[i].length = counts * stride;
1115 frames += counts;
1116 urb->number_of_packets++;
1117 subs->transfer_done += counts;
1118 if (subs->transfer_done >= runtime->period_size) {
1119 subs->transfer_done -= runtime->period_size;
1120 period_elapsed = 1;
1121 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1122 if (subs->transfer_done > 0) {
1123 /* FIXME: fill-max mode is not
1124 * supported yet */
1125 frames -= subs->transfer_done;
1126 counts -= subs->transfer_done;
1127 urb->iso_frame_desc[i].length =
1128 counts * stride;
1129 subs->transfer_done = 0;
1130 }
1131 i++;
1132 if (i < ctx->packets) {
1133 /* add a transfer delimiter */
1134 urb->iso_frame_desc[i].offset =
1135 frames * stride;
1136 urb->iso_frame_desc[i].length = 0;
1137 urb->number_of_packets++;
1138 }
1139 break;
1140 }
1141 }
1142 if (period_elapsed &&
1143 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1144 break;
1145 }
1146 bytes = frames * stride;
1147 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1148 /* err, the transferred area goes over buffer boundary. */
1149 unsigned int bytes1 =
1150 runtime->buffer_size * stride - subs->hwptr_done;
1151 memcpy(urb->transfer_buffer,
1152 runtime->dma_area + subs->hwptr_done, bytes1);
1153 memcpy(urb->transfer_buffer + bytes1,
1154 runtime->dma_area, bytes - bytes1);
1155 } else {
1156 memcpy(urb->transfer_buffer,
1157 runtime->dma_area + subs->hwptr_done, bytes);
1158 }
1159 subs->hwptr_done += bytes;
1160 if (subs->hwptr_done >= runtime->buffer_size * stride)
1161 subs->hwptr_done -= runtime->buffer_size * stride;
1162
1163 /* update delay with exact number of samples queued */
1164 runtime->delay = subs->last_delay;
1165 runtime->delay += frames;
1166 subs->last_delay = runtime->delay;
1167
1168 /* realign last_frame_number */
1169 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1170 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1171
1172 spin_unlock_irqrestore(&subs->lock, flags);
1173 urb->transfer_buffer_length = bytes;
1174 if (period_elapsed)
1175 snd_pcm_period_elapsed(subs->pcm_substream);
1176 }
1177
1178 /*
1179 * process after playback data complete
1180 * - decrease the delay count again
1181 */
1182 static void retire_playback_urb(struct snd_usb_substream *subs,
1183 struct urb *urb)
1184 {
1185 unsigned long flags;
1186 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1187 int stride = runtime->frame_bits >> 3;
1188 int processed = urb->transfer_buffer_length / stride;
1189 int est_delay;
1190
1191 /* ignore the delay accounting when procssed=0 is given, i.e.
1192 * silent payloads are procssed before handling the actual data
1193 */
1194 if (!processed)
1195 return;
1196
1197 spin_lock_irqsave(&subs->lock, flags);
1198 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1199 /* update delay with exact number of samples played */
1200 if (processed > subs->last_delay)
1201 subs->last_delay = 0;
1202 else
1203 subs->last_delay -= processed;
1204 runtime->delay = subs->last_delay;
1205
1206 /*
1207 * Report when delay estimate is off by more than 2ms.
1208 * The error should be lower than 2ms since the estimate relies
1209 * on two reads of a counter updated every ms.
1210 */
1211 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1212 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1213 est_delay, subs->last_delay);
1214
1215 spin_unlock_irqrestore(&subs->lock, flags);
1216 }
1217
1218 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1219 {
1220 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1221 }
1222
1223 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1224 {
1225 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1226 }
1227
1228 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1229 {
1230 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1231 }
1232
1233 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1234 {
1235 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1236 }
1237
1238 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1239 int cmd)
1240 {
1241 struct snd_usb_substream *subs = substream->runtime->private_data;
1242
1243 switch (cmd) {
1244 case SNDRV_PCM_TRIGGER_START:
1245 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1246 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1247 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1248 subs->running = 1;
1249 return 0;
1250 case SNDRV_PCM_TRIGGER_STOP:
1251 stop_endpoints(subs, 0, 0, 0);
1252 subs->running = 0;
1253 return 0;
1254 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1255 subs->data_endpoint->prepare_data_urb = NULL;
1256 subs->data_endpoint->retire_data_urb = NULL;
1257 subs->running = 0;
1258 return 0;
1259 }
1260
1261 return -EINVAL;
1262 }
1263
1264 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1265 int cmd)
1266 {
1267 int err;
1268 struct snd_usb_substream *subs = substream->runtime->private_data;
1269
1270 switch (cmd) {
1271 case SNDRV_PCM_TRIGGER_START:
1272 err = start_endpoints(subs, 0);
1273 if (err < 0)
1274 return err;
1275
1276 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1277 subs->running = 1;
1278 return 0;
1279 case SNDRV_PCM_TRIGGER_STOP:
1280 stop_endpoints(subs, 0, 0, 0);
1281 subs->running = 0;
1282 return 0;
1283 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1284 subs->data_endpoint->retire_data_urb = NULL;
1285 subs->running = 0;
1286 return 0;
1287 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1288 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1289 subs->running = 1;
1290 return 0;
1291 }
1292
1293 return -EINVAL;
1294 }
1295
1296 static struct snd_pcm_ops snd_usb_playback_ops = {
1297 .open = snd_usb_playback_open,
1298 .close = snd_usb_playback_close,
1299 .ioctl = snd_pcm_lib_ioctl,
1300 .hw_params = snd_usb_hw_params,
1301 .hw_free = snd_usb_hw_free,
1302 .prepare = snd_usb_pcm_prepare,
1303 .trigger = snd_usb_substream_playback_trigger,
1304 .pointer = snd_usb_pcm_pointer,
1305 .page = snd_pcm_lib_get_vmalloc_page,
1306 .mmap = snd_pcm_lib_mmap_vmalloc,
1307 };
1308
1309 static struct snd_pcm_ops snd_usb_capture_ops = {
1310 .open = snd_usb_capture_open,
1311 .close = snd_usb_capture_close,
1312 .ioctl = snd_pcm_lib_ioctl,
1313 .hw_params = snd_usb_hw_params,
1314 .hw_free = snd_usb_hw_free,
1315 .prepare = snd_usb_pcm_prepare,
1316 .trigger = snd_usb_substream_capture_trigger,
1317 .pointer = snd_usb_pcm_pointer,
1318 .page = snd_pcm_lib_get_vmalloc_page,
1319 .mmap = snd_pcm_lib_mmap_vmalloc,
1320 };
1321
1322 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1323 {
1324 snd_pcm_set_ops(pcm, stream,
1325 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1326 &snd_usb_playback_ops : &snd_usb_capture_ops);
1327 }
Linux kernel - Deliverables
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