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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / sound / usb / pcm.c
blobee3c15c546e0350fe741481763557f131749c5df
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, unsigned int format,
88 unsigned int rate, unsigned int channels)
89 {
90 struct list_head *p;
91 struct audioformat *found = NULL;
92 int cur_attr = 0, attr;
93
94 list_for_each(p, &subs->fmt_list) {
95 struct audioformat *fp;
96 fp = list_entry(p, struct audioformat, list);
97 if (!(fp->formats & (1uLL << format)))
98 continue;
99 if (fp->channels != channels)
100 continue;
101 if (rate < fp->rate_min || 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] == 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 * hw_params callback
442 *
443 * allocate a buffer and set the given audio format.
444 *
445 * so far we use a physically linear buffer although packetize transfer
446 * doesn't need a continuous area.
447 * if sg buffer is supported on the later version of alsa, we'll follow
448 * that.
449 */
450 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
451 struct snd_pcm_hw_params *hw_params)
452 {
453 struct snd_usb_substream *subs = substream->runtime->private_data;
454 struct audioformat *fmt;
455 unsigned int channels, rate, format;
456 int ret, changed;
457
458 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
459 params_buffer_bytes(hw_params));
460 if (ret < 0)
461 return ret;
462
463 format = params_format(hw_params);
464 rate = params_rate(hw_params);
465 channels = params_channels(hw_params);
466 fmt = find_format(subs, format, rate, channels);
467 if (!fmt) {
468 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
469 format, rate, channels);
470 return -EINVAL;
471 }
472
473 changed = subs->cur_audiofmt != fmt ||
474 subs->period_bytes != params_period_bytes(hw_params) ||
475 subs->cur_rate != rate;
476
477 down_read(&subs->stream->chip->shutdown_rwsem);
478 if (subs->stream->chip->shutdown) {
479 ret = -ENODEV;
480 goto unlock;
481 }
482 if ((ret = set_format(subs, fmt)) < 0)
483 goto unlock;
484
485 if (subs->cur_rate != rate) {
486 struct usb_host_interface *alts;
487 struct usb_interface *iface;
488 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
489 alts = &iface->altsetting[fmt->altset_idx];
490 ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate);
491 if (ret < 0)
492 goto unlock;
493 subs->cur_rate = rate;
494 }
495
496 if (changed) {
497 /* format changed */
498 stop_endpoints(subs, 0, 0, 0);
499 ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
500 subs->sync_endpoint);
501 if (ret < 0)
502 goto unlock;
503
504 if (subs->sync_endpoint)
505 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
506 hw_params, fmt, NULL);
507 }
508
509 if (ret == 0) {
510 subs->interface = fmt->iface;
511 subs->altset_idx = fmt->altset_idx;
512 }
513
514 unlock:
515 up_read(&subs->stream->chip->shutdown_rwsem);
516 return ret;
517 }
518
519 /*
520 * hw_free callback
521 *
522 * reset the audio format and release the buffer
523 */
524 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
525 {
526 struct snd_usb_substream *subs = substream->runtime->private_data;
527
528 subs->cur_audiofmt = NULL;
529 subs->cur_rate = 0;
530 subs->period_bytes = 0;
531 down_read(&subs->stream->chip->shutdown_rwsem);
532 if (!subs->stream->chip->shutdown) {
533 stop_endpoints(subs, 0, 1, 1);
534 deactivate_endpoints(subs);
535 }
536 up_read(&subs->stream->chip->shutdown_rwsem);
537 return snd_pcm_lib_free_vmalloc_buffer(substream);
538 }
539
540 /*
541 * prepare callback
542 *
543 * only a few subtle things...
544 */
545 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
546 {
547 struct snd_pcm_runtime *runtime = substream->runtime;
548 struct snd_usb_substream *subs = runtime->private_data;
549 int ret = 0;
550
551 if (! subs->cur_audiofmt) {
552 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
553 return -ENXIO;
554 }
555
556 down_read(&subs->stream->chip->shutdown_rwsem);
557 if (subs->stream->chip->shutdown) {
558 ret = -ENODEV;
559 goto unlock;
560 }
561 if (snd_BUG_ON(!subs->data_endpoint)) {
562 ret = -EIO;
563 goto unlock;
564 }
565
566 /* some unit conversions in runtime */
567 subs->data_endpoint->maxframesize =
568 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
569 subs->data_endpoint->curframesize =
570 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
571
572 /* reset the pointer */
573 subs->hwptr_done = 0;
574 subs->transfer_done = 0;
575 subs->last_delay = 0;
576 subs->last_frame_number = 0;
577 runtime->delay = 0;
578
579 /* for playback, submit the URBs now; otherwise, the first hwptr_done
580 * updates for all URBs would happen at the same time when starting */
581 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
582 ret = start_endpoints(subs, 1);
583
584 unlock:
585 up_read(&subs->stream->chip->shutdown_rwsem);
586 return ret;
587 }
588
589 static struct snd_pcm_hardware snd_usb_hardware =
590 {
591 .info = SNDRV_PCM_INFO_MMAP |
592 SNDRV_PCM_INFO_MMAP_VALID |
593 SNDRV_PCM_INFO_BATCH |
594 SNDRV_PCM_INFO_INTERLEAVED |
595 SNDRV_PCM_INFO_BLOCK_TRANSFER |
596 SNDRV_PCM_INFO_PAUSE,
597 .buffer_bytes_max = 1024 * 1024,
598 .period_bytes_min = 64,
599 .period_bytes_max = 512 * 1024,
600 .periods_min = 2,
601 .periods_max = 1024,
602 };
603
604 static int hw_check_valid_format(struct snd_usb_substream *subs,
605 struct snd_pcm_hw_params *params,
606 struct audioformat *fp)
607 {
608 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
609 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
610 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
611 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
612 struct snd_mask check_fmts;
613 unsigned int ptime;
614
615 /* check the format */
616 snd_mask_none(&check_fmts);
617 check_fmts.bits[0] = (u32)fp->formats;
618 check_fmts.bits[1] = (u32)(fp->formats >> 32);
619 snd_mask_intersect(&check_fmts, fmts);
620 if (snd_mask_empty(&check_fmts)) {
621 hwc_debug(" > check: no supported format %d\n", fp->format);
622 return 0;
623 }
624 /* check the channels */
625 if (fp->channels < ct->min || fp->channels > ct->max) {
626 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
627 return 0;
628 }
629 /* check the rate is within the range */
630 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
631 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
632 return 0;
633 }
634 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
635 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
636 return 0;
637 }
638 /* check whether the period time is >= the data packet interval */
639 if (subs->speed != USB_SPEED_FULL) {
640 ptime = 125 * (1 << fp->datainterval);
641 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
642 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
643 return 0;
644 }
645 }
646 return 1;
647 }
648
649 static int hw_rule_rate(struct snd_pcm_hw_params *params,
650 struct snd_pcm_hw_rule *rule)
651 {
652 struct snd_usb_substream *subs = rule->private;
653 struct list_head *p;
654 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
655 unsigned int rmin, rmax;
656 int changed;
657
658 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
659 changed = 0;
660 rmin = rmax = 0;
661 list_for_each(p, &subs->fmt_list) {
662 struct audioformat *fp;
663 fp = list_entry(p, struct audioformat, list);
664 if (!hw_check_valid_format(subs, params, fp))
665 continue;
666 if (changed++) {
667 if (rmin > fp->rate_min)
668 rmin = fp->rate_min;
669 if (rmax < fp->rate_max)
670 rmax = fp->rate_max;
671 } else {
672 rmin = fp->rate_min;
673 rmax = fp->rate_max;
674 }
675 }
676
677 if (!changed) {
678 hwc_debug(" --> get empty\n");
679 it->empty = 1;
680 return -EINVAL;
681 }
682
683 changed = 0;
684 if (it->min < rmin) {
685 it->min = rmin;
686 it->openmin = 0;
687 changed = 1;
688 }
689 if (it->max > rmax) {
690 it->max = rmax;
691 it->openmax = 0;
692 changed = 1;
693 }
694 if (snd_interval_checkempty(it)) {
695 it->empty = 1;
696 return -EINVAL;
697 }
698 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
699 return changed;
700 }
701
702
703 static int hw_rule_channels(struct snd_pcm_hw_params *params,
704 struct snd_pcm_hw_rule *rule)
705 {
706 struct snd_usb_substream *subs = rule->private;
707 struct list_head *p;
708 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
709 unsigned int rmin, rmax;
710 int changed;
711
712 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
713 changed = 0;
714 rmin = rmax = 0;
715 list_for_each(p, &subs->fmt_list) {
716 struct audioformat *fp;
717 fp = list_entry(p, struct audioformat, list);
718 if (!hw_check_valid_format(subs, params, fp))
719 continue;
720 if (changed++) {
721 if (rmin > fp->channels)
722 rmin = fp->channels;
723 if (rmax < fp->channels)
724 rmax = fp->channels;
725 } else {
726 rmin = fp->channels;
727 rmax = fp->channels;
728 }
729 }
730
731 if (!changed) {
732 hwc_debug(" --> get empty\n");
733 it->empty = 1;
734 return -EINVAL;
735 }
736
737 changed = 0;
738 if (it->min < rmin) {
739 it->min = rmin;
740 it->openmin = 0;
741 changed = 1;
742 }
743 if (it->max > rmax) {
744 it->max = rmax;
745 it->openmax = 0;
746 changed = 1;
747 }
748 if (snd_interval_checkempty(it)) {
749 it->empty = 1;
750 return -EINVAL;
751 }
752 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
753 return changed;
754 }
755
756 static int hw_rule_format(struct snd_pcm_hw_params *params,
757 struct snd_pcm_hw_rule *rule)
758 {
759 struct snd_usb_substream *subs = rule->private;
760 struct list_head *p;
761 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
762 u64 fbits;
763 u32 oldbits[2];
764 int changed;
765
766 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
767 fbits = 0;
768 list_for_each(p, &subs->fmt_list) {
769 struct audioformat *fp;
770 fp = list_entry(p, struct audioformat, list);
771 if (!hw_check_valid_format(subs, params, fp))
772 continue;
773 fbits |= fp->formats;
774 }
775
776 oldbits[0] = fmt->bits[0];
777 oldbits[1] = fmt->bits[1];
778 fmt->bits[0] &= (u32)fbits;
779 fmt->bits[1] &= (u32)(fbits >> 32);
780 if (!fmt->bits[0] && !fmt->bits[1]) {
781 hwc_debug(" --> get empty\n");
782 return -EINVAL;
783 }
784 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
785 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
786 return changed;
787 }
788
789 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
790 struct snd_pcm_hw_rule *rule)
791 {
792 struct snd_usb_substream *subs = rule->private;
793 struct audioformat *fp;
794 struct snd_interval *it;
795 unsigned char min_datainterval;
796 unsigned int pmin;
797 int changed;
798
799 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
800 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
801 min_datainterval = 0xff;
802 list_for_each_entry(fp, &subs->fmt_list, list) {
803 if (!hw_check_valid_format(subs, params, fp))
804 continue;
805 min_datainterval = min(min_datainterval, fp->datainterval);
806 }
807 if (min_datainterval == 0xff) {
808 hwc_debug(" --> get empty\n");
809 it->empty = 1;
810 return -EINVAL;
811 }
812 pmin = 125 * (1 << min_datainterval);
813 changed = 0;
814 if (it->min < pmin) {
815 it->min = pmin;
816 it->openmin = 0;
817 changed = 1;
818 }
819 if (snd_interval_checkempty(it)) {
820 it->empty = 1;
821 return -EINVAL;
822 }
823 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
824 return changed;
825 }
826
827 /*
828 * If the device supports unusual bit rates, does the request meet these?
829 */
830 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
831 struct snd_usb_substream *subs)
832 {
833 struct audioformat *fp;
834 int *rate_list;
835 int count = 0, needs_knot = 0;
836 int err;
837
838 kfree(subs->rate_list.list);
839 subs->rate_list.list = NULL;
840
841 list_for_each_entry(fp, &subs->fmt_list, list) {
842 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
843 return 0;
844 count += fp->nr_rates;
845 if (fp->rates & SNDRV_PCM_RATE_KNOT)
846 needs_knot = 1;
847 }
848 if (!needs_knot)
849 return 0;
850
851 subs->rate_list.list = rate_list =
852 kmalloc(sizeof(int) * count, GFP_KERNEL);
853 if (!subs->rate_list.list)
854 return -ENOMEM;
855 subs->rate_list.count = count;
856 subs->rate_list.mask = 0;
857 count = 0;
858 list_for_each_entry(fp, &subs->fmt_list, list) {
859 int i;
860 for (i = 0; i < fp->nr_rates; i++)
861 rate_list[count++] = fp->rate_table[i];
862 }
863 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
864 &subs->rate_list);
865 if (err < 0)
866 return err;
867
868 return 0;
869 }
870
871
872 /*
873 * set up the runtime hardware information.
874 */
875
876 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
877 {
878 struct list_head *p;
879 unsigned int pt, ptmin;
880 int param_period_time_if_needed;
881 int err;
882
883 runtime->hw.formats = subs->formats;
884
885 runtime->hw.rate_min = 0x7fffffff;
886 runtime->hw.rate_max = 0;
887 runtime->hw.channels_min = 256;
888 runtime->hw.channels_max = 0;
889 runtime->hw.rates = 0;
890 ptmin = UINT_MAX;
891 /* check min/max rates and channels */
892 list_for_each(p, &subs->fmt_list) {
893 struct audioformat *fp;
894 fp = list_entry(p, struct audioformat, list);
895 runtime->hw.rates |= fp->rates;
896 if (runtime->hw.rate_min > fp->rate_min)
897 runtime->hw.rate_min = fp->rate_min;
898 if (runtime->hw.rate_max < fp->rate_max)
899 runtime->hw.rate_max = fp->rate_max;
900 if (runtime->hw.channels_min > fp->channels)
901 runtime->hw.channels_min = fp->channels;
902 if (runtime->hw.channels_max < fp->channels)
903 runtime->hw.channels_max = fp->channels;
904 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
905 /* FIXME: there might be more than one audio formats... */
906 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
907 fp->frame_size;
908 }
909 pt = 125 * (1 << fp->datainterval);
910 ptmin = min(ptmin, pt);
911 }
912 err = snd_usb_autoresume(subs->stream->chip);
913 if (err < 0)
914 return err;
915
916 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
917 if (subs->speed == USB_SPEED_FULL)
918 /* full speed devices have fixed data packet interval */
919 ptmin = 1000;
920 if (ptmin == 1000)
921 /* if period time doesn't go below 1 ms, no rules needed */
922 param_period_time_if_needed = -1;
923 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
924 ptmin, UINT_MAX);
925
926 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
927 hw_rule_rate, subs,
928 SNDRV_PCM_HW_PARAM_FORMAT,
929 SNDRV_PCM_HW_PARAM_CHANNELS,
930 param_period_time_if_needed,
931 -1)) < 0)
932 goto rep_err;
933 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
934 hw_rule_channels, subs,
935 SNDRV_PCM_HW_PARAM_FORMAT,
936 SNDRV_PCM_HW_PARAM_RATE,
937 param_period_time_if_needed,
938 -1)) < 0)
939 goto rep_err;
940 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
941 hw_rule_format, subs,
942 SNDRV_PCM_HW_PARAM_RATE,
943 SNDRV_PCM_HW_PARAM_CHANNELS,
944 param_period_time_if_needed,
945 -1)) < 0)
946 goto rep_err;
947 if (param_period_time_if_needed >= 0) {
948 err = snd_pcm_hw_rule_add(runtime, 0,
949 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
950 hw_rule_period_time, subs,
951 SNDRV_PCM_HW_PARAM_FORMAT,
952 SNDRV_PCM_HW_PARAM_CHANNELS,
953 SNDRV_PCM_HW_PARAM_RATE,
954 -1);
955 if (err < 0)
956 goto rep_err;
957 }
958 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
959 goto rep_err;
960 return 0;
961
962 rep_err:
963 snd_usb_autosuspend(subs->stream->chip);
964 return err;
965 }
966
967 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
968 {
969 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
970 struct snd_pcm_runtime *runtime = substream->runtime;
971 struct snd_usb_substream *subs = &as->substream[direction];
972
973 subs->interface = -1;
974 subs->altset_idx = 0;
975 runtime->hw = snd_usb_hardware;
976 runtime->private_data = subs;
977 subs->pcm_substream = substream;
978 /* runtime PM is also done there */
979 return setup_hw_info(runtime, subs);
980 }
981
982 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
983 {
984 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
985 struct snd_usb_substream *subs = &as->substream[direction];
986
987 stop_endpoints(subs, 0, 0, 0);
988
989 if (!as->chip->shutdown && subs->interface >= 0) {
990 usb_set_interface(subs->dev, subs->interface, 0);
991 subs->interface = -1;
992 }
993
994 subs->pcm_substream = NULL;
995 snd_usb_autosuspend(subs->stream->chip);
996
997 return 0;
998 }
999
1000 /* Since a URB can handle only a single linear buffer, we must use double
1001 * buffering when the data to be transferred overflows the buffer boundary.
1002 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1003 * for all URBs.
1004 */
1005 static void retire_capture_urb(struct snd_usb_substream *subs,
1006 struct urb *urb)
1007 {
1008 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1009 unsigned int stride, frames, bytes, oldptr;
1010 int i, period_elapsed = 0;
1011 unsigned long flags;
1012 unsigned char *cp;
1013
1014 stride = runtime->frame_bits >> 3;
1015
1016 for (i = 0; i < urb->number_of_packets; i++) {
1017 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1018 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1019 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1020 // continue;
1021 }
1022 bytes = urb->iso_frame_desc[i].actual_length;
1023 frames = bytes / stride;
1024 if (!subs->txfr_quirk)
1025 bytes = frames * stride;
1026 if (bytes % (runtime->sample_bits >> 3) != 0) {
1027 #ifdef CONFIG_SND_DEBUG_VERBOSE
1028 int oldbytes = bytes;
1029 #endif
1030 bytes = frames * stride;
1031 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1032 oldbytes, bytes);
1033 }
1034 /* update the current pointer */
1035 spin_lock_irqsave(&subs->lock, flags);
1036 oldptr = subs->hwptr_done;
1037 subs->hwptr_done += bytes;
1038 if (subs->hwptr_done >= runtime->buffer_size * stride)
1039 subs->hwptr_done -= runtime->buffer_size * stride;
1040 frames = (bytes + (oldptr % stride)) / stride;
1041 subs->transfer_done += frames;
1042 if (subs->transfer_done >= runtime->period_size) {
1043 subs->transfer_done -= runtime->period_size;
1044 period_elapsed = 1;
1045 }
1046 spin_unlock_irqrestore(&subs->lock, flags);
1047 /* copy a data chunk */
1048 if (oldptr + bytes > runtime->buffer_size * stride) {
1049 unsigned int bytes1 =
1050 runtime->buffer_size * stride - oldptr;
1051 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1052 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1053 } else {
1054 memcpy(runtime->dma_area + oldptr, cp, bytes);
1055 }
1056 }
1057
1058 if (period_elapsed)
1059 snd_pcm_period_elapsed(subs->pcm_substream);
1060 }
1061
1062 static void prepare_playback_urb(struct snd_usb_substream *subs,
1063 struct urb *urb)
1064 {
1065 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1066 struct snd_usb_endpoint *ep = subs->data_endpoint;
1067 struct snd_urb_ctx *ctx = urb->context;
1068 unsigned int counts, frames, bytes;
1069 int i, stride, period_elapsed = 0;
1070 unsigned long flags;
1071
1072 stride = runtime->frame_bits >> 3;
1073
1074 frames = 0;
1075 urb->number_of_packets = 0;
1076 spin_lock_irqsave(&subs->lock, flags);
1077 for (i = 0; i < ctx->packets; i++) {
1078 if (ctx->packet_size[i])
1079 counts = ctx->packet_size[i];
1080 else
1081 counts = snd_usb_endpoint_next_packet_size(ep);
1082
1083 /* set up descriptor */
1084 urb->iso_frame_desc[i].offset = frames * stride;
1085 urb->iso_frame_desc[i].length = counts * stride;
1086 frames += counts;
1087 urb->number_of_packets++;
1088 subs->transfer_done += counts;
1089 if (subs->transfer_done >= runtime->period_size) {
1090 subs->transfer_done -= runtime->period_size;
1091 period_elapsed = 1;
1092 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1093 if (subs->transfer_done > 0) {
1094 /* FIXME: fill-max mode is not
1095 * supported yet */
1096 frames -= subs->transfer_done;
1097 counts -= subs->transfer_done;
1098 urb->iso_frame_desc[i].length =
1099 counts * stride;
1100 subs->transfer_done = 0;
1101 }
1102 i++;
1103 if (i < ctx->packets) {
1104 /* add a transfer delimiter */
1105 urb->iso_frame_desc[i].offset =
1106 frames * stride;
1107 urb->iso_frame_desc[i].length = 0;
1108 urb->number_of_packets++;
1109 }
1110 break;
1111 }
1112 }
1113 if (period_elapsed &&
1114 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1115 break;
1116 }
1117 bytes = frames * stride;
1118 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1119 /* err, the transferred area goes over buffer boundary. */
1120 unsigned int bytes1 =
1121 runtime->buffer_size * stride - subs->hwptr_done;
1122 memcpy(urb->transfer_buffer,
1123 runtime->dma_area + subs->hwptr_done, bytes1);
1124 memcpy(urb->transfer_buffer + bytes1,
1125 runtime->dma_area, bytes - bytes1);
1126 } else {
1127 memcpy(urb->transfer_buffer,
1128 runtime->dma_area + subs->hwptr_done, bytes);
1129 }
1130 subs->hwptr_done += bytes;
1131 if (subs->hwptr_done >= runtime->buffer_size * stride)
1132 subs->hwptr_done -= runtime->buffer_size * stride;
1133
1134 /* update delay with exact number of samples queued */
1135 runtime->delay = subs->last_delay;
1136 runtime->delay += frames;
1137 subs->last_delay = runtime->delay;
1138
1139 /* realign last_frame_number */
1140 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1141 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1142
1143 spin_unlock_irqrestore(&subs->lock, flags);
1144 urb->transfer_buffer_length = bytes;
1145 if (period_elapsed)
1146 snd_pcm_period_elapsed(subs->pcm_substream);
1147 }
1148
1149 /*
1150 * process after playback data complete
1151 * - decrease the delay count again
1152 */
1153 static void retire_playback_urb(struct snd_usb_substream *subs,
1154 struct urb *urb)
1155 {
1156 unsigned long flags;
1157 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1158 int stride = runtime->frame_bits >> 3;
1159 int processed = urb->transfer_buffer_length / stride;
1160 int est_delay;
1161
1162 /* ignore the delay accounting when procssed=0 is given, i.e.
1163 * silent payloads are procssed before handling the actual data
1164 */
1165 if (!processed)
1166 return;
1167
1168 spin_lock_irqsave(&subs->lock, flags);
1169 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1170 /* update delay with exact number of samples played */
1171 if (processed > subs->last_delay)
1172 subs->last_delay = 0;
1173 else
1174 subs->last_delay -= processed;
1175 runtime->delay = subs->last_delay;
1176
1177 /*
1178 * Report when delay estimate is off by more than 2ms.
1179 * The error should be lower than 2ms since the estimate relies
1180 * on two reads of a counter updated every ms.
1181 */
1182 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1183 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1184 est_delay, subs->last_delay);
1185
1186 spin_unlock_irqrestore(&subs->lock, flags);
1187 }
1188
1189 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1190 {
1191 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1192 }
1193
1194 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1195 {
1196 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1197 }
1198
1199 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1200 {
1201 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1202 }
1203
1204 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1205 {
1206 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1207 }
1208
1209 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1210 int cmd)
1211 {
1212 struct snd_usb_substream *subs = substream->runtime->private_data;
1213
1214 switch (cmd) {
1215 case SNDRV_PCM_TRIGGER_START:
1216 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1217 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1218 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1219 subs->running = 1;
1220 return 0;
1221 case SNDRV_PCM_TRIGGER_STOP:
1222 stop_endpoints(subs, 0, 0, 0);
1223 subs->running = 0;
1224 return 0;
1225 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1226 subs->data_endpoint->prepare_data_urb = NULL;
1227 subs->data_endpoint->retire_data_urb = NULL;
1228 subs->running = 0;
1229 return 0;
1230 }
1231
1232 return -EINVAL;
1233 }
1234
1235 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1236 int cmd)
1237 {
1238 int err;
1239 struct snd_usb_substream *subs = substream->runtime->private_data;
1240
1241 switch (cmd) {
1242 case SNDRV_PCM_TRIGGER_START:
1243 err = start_endpoints(subs, 0);
1244 if (err < 0)
1245 return err;
1246
1247 subs->data_endpoint->retire_data_urb = retire_capture_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->retire_data_urb = NULL;
1256 subs->running = 0;
1257 return 0;
1258 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1259 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1260 subs->running = 1;
1261 return 0;
1262 }
1263
1264 return -EINVAL;
1265 }
1266
1267 static struct snd_pcm_ops snd_usb_playback_ops = {
1268 .open = snd_usb_playback_open,
1269 .close = snd_usb_playback_close,
1270 .ioctl = snd_pcm_lib_ioctl,
1271 .hw_params = snd_usb_hw_params,
1272 .hw_free = snd_usb_hw_free,
1273 .prepare = snd_usb_pcm_prepare,
1274 .trigger = snd_usb_substream_playback_trigger,
1275 .pointer = snd_usb_pcm_pointer,
1276 .page = snd_pcm_lib_get_vmalloc_page,
1277 .mmap = snd_pcm_lib_mmap_vmalloc,
1278 };
1279
1280 static struct snd_pcm_ops snd_usb_capture_ops = {
1281 .open = snd_usb_capture_open,
1282 .close = snd_usb_capture_close,
1283 .ioctl = snd_pcm_lib_ioctl,
1284 .hw_params = snd_usb_hw_params,
1285 .hw_free = snd_usb_hw_free,
1286 .prepare = snd_usb_pcm_prepare,
1287 .trigger = snd_usb_substream_capture_trigger,
1288 .pointer = snd_usb_pcm_pointer,
1289 .page = snd_pcm_lib_get_vmalloc_page,
1290 .mmap = snd_pcm_lib_mmap_vmalloc,
1291 };
1292
1293 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1294 {
1295 snd_pcm_set_ops(pcm, stream,
1296 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1297 &snd_usb_playback_ops : &snd_usb_capture_ops);
1298 }
Linux ARM platform port for MOXA ART SoC