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ALSA: usb-audio: Move configuration to prepare.
[deliverable/linux.git] / sound / usb / pcm.c
CommitLineData
e5779998
DM		 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>
9966ddaf 18#include <linux/slab.h>
edcd3633 19#include <linux/ratelimit.h>
e5779998
DM		 20#include <linux/usb.h>
21#include <linux/usb/audio.h>
7e847894 22#include <linux/usb/audio-v2.h>
e5779998
DM		 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"
c731bc96 32#include "endpoint.h"
e5779998
DM		 33#include "helper.h"
34#include "pcm.h"
79f920fb 35#include "clock.h"
88a8516a 36#include "power.h"
e5779998 37
edcd3633
DM		 38#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
39#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
40
294c4fb8
PLB		 41/* return the estimated delay based on USB frame counters */
42snd_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
e5779998
DM		 65/*
66 * return the current pcm pointer. just based on the hwptr_done value.
67 */
68static 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 spin_lock(&subs->lock);
75 hwptr_done = subs->hwptr_done;
294c4fb8
PLB		 76 substream->runtime->delay = snd_usb_pcm_delay(subs,
77 substream->runtime->rate);
e5779998
DM		 78 spin_unlock(&subs->lock);
79 return hwptr_done / (substream->runtime->frame_bits >> 3);
80}
81
82/*
83 * find a matching audio format
84 */
61a70950 85static struct audioformat *find_format(struct snd_usb_substream *subs)
e5779998
DM		 86{
87 struct list_head *p;
88 struct audioformat *found = NULL;
89 int cur_attr = 0, attr;
90
91 list_for_each(p, &subs->fmt_list) {
92 struct audioformat *fp;
93 fp = list_entry(p, struct audioformat, list);
61a70950 94 if (!(fp->formats & (1uLL << subs->pcm_format)))
015eb0b0 95 continue;
61a70950 96 if (fp->channels != subs->channels)
e5779998 97 continue;
61a70950
DR		 98 if (subs->cur_rate < fp->rate_min ||
99 subs->cur_rate > fp->rate_max)
e5779998
DM		 100 continue;
101 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
102 unsigned int i;
103 for (i = 0; i < fp->nr_rates; i++)
61a70950 104 if (fp->rate_table[i] == subs->cur_rate)
e5779998
DM		 105 break;
106 if (i >= fp->nr_rates)
107 continue;
108 }
109 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
110 if (! found) {
111 found = fp;
112 cur_attr = attr;
113 continue;
114 }
115 /* avoid async out and adaptive in if the other method
116 * supports the same format.
117 * this is a workaround for the case like
118 * M-audio audiophile USB.
119 */
120 if (attr != cur_attr) {
121 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
122 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
123 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
124 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
125 continue;
126 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
127 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
128 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
129 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
130 found = fp;
131 cur_attr = attr;
132 continue;
133 }
134 }
135 /* find the format with the largest max. packet size */
136 if (fp->maxpacksize > found->maxpacksize) {
137 found = fp;
138 cur_attr = attr;
139 }
140 }
141 return found;
142}
143
767d75ad
DM		 144static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
145 struct usb_host_interface *alts,
146 struct audioformat *fmt)
147{
148 struct usb_device *dev = chip->dev;
149 unsigned int ep;
150 unsigned char data[1];
151 int err;
152
153 ep = get_endpoint(alts, 0)->bEndpointAddress;
154
767d75ad
DM		 155 data[0] = 1;
156 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
157 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
158 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
17d900c4 159 data, sizeof(data))) < 0) {
767d75ad
DM		 160 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
161 dev->devnum, iface, ep);
162 return err;
163 }
164
165 return 0;
166}
e5779998 167
92c25611
DM		 168static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
169 struct usb_host_interface *alts,
170 struct audioformat *fmt)
171{
172 struct usb_device *dev = chip->dev;
173 unsigned char data[1];
174 unsigned int ep;
175 int err;
176
177 ep = get_endpoint(alts, 0)->bEndpointAddress;
178
179 data[0] = 1;
180 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
181 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
182 UAC2_EP_CS_PITCH << 8, 0,
17d900c4 183 data, sizeof(data))) < 0) {
92c25611
DM		 184 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
185 dev->devnum, iface, fmt->altsetting);
186 return err;
187 }
188
189 return 0;
190}
191
e5779998 192/*
92c25611 193 * initialize the pitch control and sample rate
e5779998 194 */
767d75ad 195int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
e5779998
DM		 196 struct usb_host_interface *alts,
197 struct audioformat *fmt)
198{
767d75ad
DM		 199 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
200
92c25611
DM		 201 /* if endpoint doesn't have pitch control, bail out */
202 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
203 return 0;
204
767d75ad
DM		 205 switch (altsd->bInterfaceProtocol) {
206 case UAC_VERSION_1:
a2acad82 207 default:
767d75ad
DM		 208 return init_pitch_v1(chip, iface, alts, fmt);
209
210 case UAC_VERSION_2:
92c25611 211 return init_pitch_v2(chip, iface, alts, fmt);
767d75ad 212 }
767d75ad
DM		 213}
214
015618b9 215static int start_endpoints(struct snd_usb_substream *subs, int can_sleep)
edcd3633
DM		 216{
217 int err;
218
219 if (!subs->data_endpoint)
220 return -EINVAL;
221
222 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
223 struct snd_usb_endpoint *ep = subs->data_endpoint;
224
225 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
226
227 ep->data_subs = subs;
015618b9 228 err = snd_usb_endpoint_start(ep, can_sleep);
edcd3633
DM		 229 if (err < 0) {
230 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
231 return err;
232 }
233 }
234
235 if (subs->sync_endpoint &&
236 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
237 struct snd_usb_endpoint *ep = subs->sync_endpoint;
238
2e4a263c
DM		 239 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
240 subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
241 err = usb_set_interface(subs->dev,
242 subs->sync_endpoint->iface,
243 subs->sync_endpoint->alt_idx);
244 if (err < 0) {
245 snd_printk(KERN_ERR
246 "%d:%d:%d: cannot set interface (%d)\n",
247 subs->dev->devnum,
248 subs->sync_endpoint->iface,
249 subs->sync_endpoint->alt_idx, err);
250 return -EIO;
251 }
252 }
253
edcd3633
DM		 254 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
255
256 ep->sync_slave = subs->data_endpoint;
015618b9 257 err = snd_usb_endpoint_start(ep, can_sleep);
edcd3633
DM		 258 if (err < 0) {
259 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
260 return err;
261 }
262 }
263
264 return 0;
265}
266
267static void stop_endpoints(struct snd_usb_substream *subs,
268 int force, int can_sleep, int wait)
269{
270 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
271 snd_usb_endpoint_stop(subs->sync_endpoint,
272 force, can_sleep, wait);
273
274 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
275 snd_usb_endpoint_stop(subs->data_endpoint,
276 force, can_sleep, wait);
277}
278
edcd3633
DM		 279static int deactivate_endpoints(struct snd_usb_substream *subs)
280{
281 int reta, retb;
282
283 reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
284 retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
285
286 if (reta < 0)
287 return reta;
288
289 if (retb < 0)
290 return retb;
291
292 return 0;
293}
294
e5779998
DM		 295/*
296 * find a matching format and set up the interface
297 */
298static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
299{
300 struct usb_device *dev = subs->dev;
301 struct usb_host_interface *alts;
302 struct usb_interface_descriptor *altsd;
303 struct usb_interface *iface;
304 unsigned int ep, attr;
305 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
c75a8a7a 306 int err, implicit_fb = 0;
e5779998
DM		 307
308 iface = usb_ifnum_to_if(dev, fmt->iface);
309 if (WARN_ON(!iface))
310 return -EINVAL;
311 alts = &iface->altsetting[fmt->altset_idx];
312 altsd = get_iface_desc(alts);
313 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
314 return -EINVAL;
315
316 if (fmt == subs->cur_audiofmt)
317 return 0;
318
68e67f40
DM		 319 /* close the old interface */
320 if (subs->interface >= 0 && subs->interface != fmt->iface) {
321 err = usb_set_interface(subs->dev, subs->interface, 0);
322 if (err < 0) {
323 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
324 dev->devnum, fmt->iface, fmt->altsetting, err);
325 return -EIO;
326 }
327 subs->interface = -1;
328 subs->altset_idx = 0;
329 }
330
331 /* set interface */
332 if (subs->interface != fmt->iface ||
333 subs->altset_idx != fmt->altset_idx) {
334 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
335 if (err < 0) {
336 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
337 dev->devnum, fmt->iface, fmt->altsetting, err);
338 return -EIO;
339 }
340 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
341 fmt->iface, fmt->altsetting);
342 subs->interface = fmt->iface;
343 subs->altset_idx = fmt->altset_idx;
344 }
345
edcd3633
DM		 346 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
347 alts, fmt->endpoint, subs->direction,
348 SND_USB_ENDPOINT_TYPE_DATA);
349 if (!subs->data_endpoint)
350 return -EINVAL;
e5779998
DM		 351
352 /* we need a sync pipe in async OUT or adaptive IN mode */
353 /* check the number of EP, since some devices have broken
354 * descriptors which fool us. if it has only one EP,
355 * assume it as adaptive-out or sync-in.
356 */
357 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
c75a8a7a
DM		 358
359 switch (subs->stream->chip->usb_id) {
360 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
361 case USB_ID(0x0763, 0x2081):
362 if (is_playback) {
363 implicit_fb = 1;
edcd3633
DM		 364 ep = 0x81;
365 iface = usb_ifnum_to_if(dev, 2);
c75a8a7a
DM		 366
367 if (!iface || iface->num_altsetting == 0)
368 return -EINVAL;
369
edcd3633
DM		 370 alts = &iface->altsetting[1];
371 goto add_sync_ep;
372 }
c75a8a7a 373 }
edcd3633 374
c75a8a7a
DM		 375 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
376 (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
377 altsd->bNumEndpoints >= 2) {
e5779998
DM		 378 /* check sync-pipe endpoint */
379 /* ... and check descriptor size before accessing bSynchAddress
380 because there is a version of the SB Audigy 2 NX firmware lacking
381 the audio fields in the endpoint descriptors */
382 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
383 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
c75a8a7a
DM		 384 get_endpoint(alts, 1)->bSynchAddress != 0 &&
385 !implicit_fb)) {
7fb75db1
DM		 386 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
387 dev->devnum, fmt->iface, fmt->altsetting,
388 get_endpoint(alts, 1)->bmAttributes,
389 get_endpoint(alts, 1)->bLength,
390 get_endpoint(alts, 1)->bSynchAddress);
e5779998
DM		 391 return -EINVAL;
392 }
393 ep = get_endpoint(alts, 1)->bEndpointAddress;
7fb75db1
DM		 394 if (!implicit_fb &&
395 get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
e5779998 396 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
7fb75db1
DM		 397 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
398 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
399 dev->devnum, fmt->iface, fmt->altsetting,
400 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
e5779998
DM		 401 return -EINVAL;
402 }
c75a8a7a
DM		 403
404 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
405 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
406
edcd3633
DM		 407add_sync_ep:
408 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
409 alts, ep, !subs->direction,
c75a8a7a
DM		 410 implicit_fb ?
411 SND_USB_ENDPOINT_TYPE_DATA :
412 SND_USB_ENDPOINT_TYPE_SYNC);
edcd3633
DM		 413 if (!subs->sync_endpoint)
414 return -EINVAL;
415
416 subs->data_endpoint->sync_master = subs->sync_endpoint;
417 }
e5779998 418
9e9b5946 419 if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
e5779998
DM		 420 return err;
421
422 subs->cur_audiofmt = fmt;
423
424 snd_usb_set_format_quirk(subs, fmt);
425
426#if 0
427 printk(KERN_DEBUG
428 "setting done: format = %d, rate = %d..%d, channels = %d\n",
429 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
430 printk(KERN_DEBUG
431 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
432 subs->datapipe, subs->syncpipe);
433#endif
434
435 return 0;
436}
437
61a70950
DR		 438/*
439 * configure endpoint params
440 *
441 * called during initial setup and upon resume
442 */
443static int configure_endpoint(struct snd_usb_substream *subs)
444{
445 int ret;
446
447 mutex_lock(&subs->stream->chip->shutdown_mutex);
448 /* format changed */
449 stop_endpoints(subs, 0, 0, 0);
450 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
451 subs->pcm_format,
452 subs->channels,
453 subs->period_bytes,
454 subs->cur_rate,
455 subs->cur_audiofmt,
456 subs->sync_endpoint);
457 if (ret < 0)
458 goto unlock;
459
460 if (subs->sync_endpoint)
461 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
462 subs->pcm_format,
463 subs->channels,
464 subs->period_bytes,
465 subs->cur_rate,
466 subs->cur_audiofmt,
467 NULL);
468
469unlock:
470 mutex_unlock(&subs->stream->chip->shutdown_mutex);
471 return ret;
472}
473
e5779998
DM		 474/*
475 * hw_params callback
476 *
477 * allocate a buffer and set the given audio format.
478 *
479 * so far we use a physically linear buffer although packetize transfer
480 * doesn't need a continuous area.
481 * if sg buffer is supported on the later version of alsa, we'll follow
482 * that.
483 */
484static int snd_usb_hw_params(struct snd_pcm_substream *substream,
485 struct snd_pcm_hw_params *hw_params)
486{
487 struct snd_usb_substream *subs = substream->runtime->private_data;
488 struct audioformat *fmt;
61a70950 489 int ret;
e5779998
DM		 490
491 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
492 params_buffer_bytes(hw_params));
493 if (ret < 0)
494 return ret;
495
61a70950
DR		 496 subs->pcm_format = params_format(hw_params);
497 subs->period_bytes = params_period_bytes(hw_params);
498 subs->channels = params_channels(hw_params);
499 subs->cur_rate = params_rate(hw_params);
500
501 fmt = find_format(subs);
e5779998
DM		 502 if (!fmt) {
503 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
61a70950 504 subs->pcm_format, subs->cur_rate, subs->channels);
e5779998
DM		 505 return -EINVAL;
506 }
507
e5779998
DM		 508 if ((ret = set_format(subs, fmt)) < 0)
509 return ret;
510
61a70950
DR		 511 subs->interface = fmt->iface;
512 subs->altset_idx = fmt->altset_idx;
715a1705 513
61a70950 514 return 0;
e5779998
DM		 515}
516
517/*
518 * hw_free callback
519 *
520 * reset the audio format and release the buffer
521 */
522static int snd_usb_hw_free(struct snd_pcm_substream *substream)
523{
524 struct snd_usb_substream *subs = substream->runtime->private_data;
525
526 subs->cur_audiofmt = NULL;
527 subs->cur_rate = 0;
528 subs->period_bytes = 0;
382225e6 529 mutex_lock(&subs->stream->chip->shutdown_mutex);
edcd3633 530 stop_endpoints(subs, 0, 1, 1);
68e67f40 531 deactivate_endpoints(subs);
382225e6 532 mutex_unlock(&subs->stream->chip->shutdown_mutex);
e5779998
DM		 533 return snd_pcm_lib_free_vmalloc_buffer(substream);
534}
535
536/*
537 * prepare callback
538 *
539 * only a few subtle things...
540 */
541static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
542{
543 struct snd_pcm_runtime *runtime = substream->runtime;
544 struct snd_usb_substream *subs = runtime->private_data;
61a70950
DR		 545 struct usb_host_interface *alts;
546 struct usb_interface *iface;
547 int ret;
e5779998
DM		 548
549 if (! subs->cur_audiofmt) {
550 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
551 return -ENXIO;
552 }
553
edcd3633
DM		 554 if (snd_BUG_ON(!subs->data_endpoint))
555 return -EIO;
556
61a70950
DR		 557 ret = set_format(subs, subs->cur_audiofmt);
558 if (ret < 0)
559 return ret;
560
561 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
562 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
563 ret = snd_usb_init_sample_rate(subs->stream->chip,
564 subs->cur_audiofmt->iface,
565 alts,
566 subs->cur_audiofmt,
567 subs->cur_rate);
568 if (ret < 0)
569 return ret;
570
571 ret = configure_endpoint(subs);
572 if (ret < 0)
573 return ret;
574
e5779998 575 /* some unit conversions in runtime */
edcd3633
DM		 576 subs->data_endpoint->maxframesize =
577 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
578 subs->data_endpoint->curframesize =
579 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
e5779998
DM		 580
581 /* reset the pointer */
582 subs->hwptr_done = 0;
583 subs->transfer_done = 0;
294c4fb8
PLB		 584 subs->last_delay = 0;
585 subs->last_frame_number = 0;
e5779998
DM		 586 runtime->delay = 0;
587
edcd3633
DM		 588 /* for playback, submit the URBs now; otherwise, the first hwptr_done
589 * updates for all URBs would happen at the same time when starting */
590 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
015618b9 591 return start_endpoints(subs, 1);
edcd3633
DM		 592
593 return 0;
e5779998
DM		 594}
595
596static struct snd_pcm_hardware snd_usb_hardware =
597{
598 .info = SNDRV_PCM_INFO_MMAP |
599 SNDRV_PCM_INFO_MMAP_VALID |
600 SNDRV_PCM_INFO_BATCH |
601 SNDRV_PCM_INFO_INTERLEAVED |
602 SNDRV_PCM_INFO_BLOCK_TRANSFER |
603 SNDRV_PCM_INFO_PAUSE,
604 .buffer_bytes_max = 1024 * 1024,
605 .period_bytes_min = 64,
606 .period_bytes_max = 512 * 1024,
607 .periods_min = 2,
608 .periods_max = 1024,
609};
610
611static int hw_check_valid_format(struct snd_usb_substream *subs,
612 struct snd_pcm_hw_params *params,
613 struct audioformat *fp)
614{
615 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
616 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
617 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
618 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
015eb0b0 619 struct snd_mask check_fmts;
e5779998
DM		 620 unsigned int ptime;
621
622 /* check the format */
015eb0b0
CL		 623 snd_mask_none(&check_fmts);
624 check_fmts.bits[0] = (u32)fp->formats;
625 check_fmts.bits[1] = (u32)(fp->formats >> 32);
626 snd_mask_intersect(&check_fmts, fmts);
627 if (snd_mask_empty(&check_fmts)) {
e5779998
DM		 628 hwc_debug(" > check: no supported format %d\n", fp->format);
629 return 0;
630 }
631 /* check the channels */
632 if (fp->channels < ct->min || fp->channels > ct->max) {
633 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
634 return 0;
635 }
636 /* check the rate is within the range */
637 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
638 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
639 return 0;
640 }
641 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
642 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
643 return 0;
644 }
645 /* check whether the period time is >= the data packet interval */
4f4e8f69 646 if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
e5779998
DM		 647 ptime = 125 * (1 << fp->datainterval);
648 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
649 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
650 return 0;
651 }
652 }
653 return 1;
654}
655
656static int hw_rule_rate(struct snd_pcm_hw_params *params,
657 struct snd_pcm_hw_rule *rule)
658{
659 struct snd_usb_substream *subs = rule->private;
660 struct list_head *p;
661 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
662 unsigned int rmin, rmax;
663 int changed;
664
665 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
666 changed = 0;
667 rmin = rmax = 0;
668 list_for_each(p, &subs->fmt_list) {
669 struct audioformat *fp;
670 fp = list_entry(p, struct audioformat, list);
671 if (!hw_check_valid_format(subs, params, fp))
672 continue;
673 if (changed++) {
674 if (rmin > fp->rate_min)
675 rmin = fp->rate_min;
676 if (rmax < fp->rate_max)
677 rmax = fp->rate_max;
678 } else {
679 rmin = fp->rate_min;
680 rmax = fp->rate_max;
681 }
682 }
683
684 if (!changed) {
685 hwc_debug(" --> get empty\n");
686 it->empty = 1;
687 return -EINVAL;
688 }
689
690 changed = 0;
691 if (it->min < rmin) {
692 it->min = rmin;
693 it->openmin = 0;
694 changed = 1;
695 }
696 if (it->max > rmax) {
697 it->max = rmax;
698 it->openmax = 0;
699 changed = 1;
700 }
701 if (snd_interval_checkempty(it)) {
702 it->empty = 1;
703 return -EINVAL;
704 }
705 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
706 return changed;
707}
708
709
710static int hw_rule_channels(struct snd_pcm_hw_params *params,
711 struct snd_pcm_hw_rule *rule)
712{
713 struct snd_usb_substream *subs = rule->private;
714 struct list_head *p;
715 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
716 unsigned int rmin, rmax;
717 int changed;
718
719 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
720 changed = 0;
721 rmin = rmax = 0;
722 list_for_each(p, &subs->fmt_list) {
723 struct audioformat *fp;
724 fp = list_entry(p, struct audioformat, list);
725 if (!hw_check_valid_format(subs, params, fp))
726 continue;
727 if (changed++) {
728 if (rmin > fp->channels)
729 rmin = fp->channels;
730 if (rmax < fp->channels)
731 rmax = fp->channels;
732 } else {
733 rmin = fp->channels;
734 rmax = fp->channels;
735 }
736 }
737
738 if (!changed) {
739 hwc_debug(" --> get empty\n");
740 it->empty = 1;
741 return -EINVAL;
742 }
743
744 changed = 0;
745 if (it->min < rmin) {
746 it->min = rmin;
747 it->openmin = 0;
748 changed = 1;
749 }
750 if (it->max > rmax) {
751 it->max = rmax;
752 it->openmax = 0;
753 changed = 1;
754 }
755 if (snd_interval_checkempty(it)) {
756 it->empty = 1;
757 return -EINVAL;
758 }
759 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
760 return changed;
761}
762
763static int hw_rule_format(struct snd_pcm_hw_params *params,
764 struct snd_pcm_hw_rule *rule)
765{
766 struct snd_usb_substream *subs = rule->private;
767 struct list_head *p;
768 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
769 u64 fbits;
770 u32 oldbits[2];
771 int changed;
772
773 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
774 fbits = 0;
775 list_for_each(p, &subs->fmt_list) {
776 struct audioformat *fp;
777 fp = list_entry(p, struct audioformat, list);
778 if (!hw_check_valid_format(subs, params, fp))
779 continue;
015eb0b0 780 fbits |= fp->formats;
e5779998
DM		 781 }
782
783 oldbits[0] = fmt->bits[0];
784 oldbits[1] = fmt->bits[1];
785 fmt->bits[0] &= (u32)fbits;
786 fmt->bits[1] &= (u32)(fbits >> 32);
787 if (!fmt->bits[0] && !fmt->bits[1]) {
788 hwc_debug(" --> get empty\n");
789 return -EINVAL;
790 }
791 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
792 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
793 return changed;
794}
795
796static int hw_rule_period_time(struct snd_pcm_hw_params *params,
797 struct snd_pcm_hw_rule *rule)
798{
799 struct snd_usb_substream *subs = rule->private;
800 struct audioformat *fp;
801 struct snd_interval *it;
802 unsigned char min_datainterval;
803 unsigned int pmin;
804 int changed;
805
806 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
807 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
808 min_datainterval = 0xff;
809 list_for_each_entry(fp, &subs->fmt_list, list) {
810 if (!hw_check_valid_format(subs, params, fp))
811 continue;
812 min_datainterval = min(min_datainterval, fp->datainterval);
813 }
814 if (min_datainterval == 0xff) {
a7ce2e0d 815 hwc_debug(" --> get empty\n");
e5779998
DM		 816 it->empty = 1;
817 return -EINVAL;
818 }
819 pmin = 125 * (1 << min_datainterval);
820 changed = 0;
821 if (it->min < pmin) {
822 it->min = pmin;
823 it->openmin = 0;
824 changed = 1;
825 }
826 if (snd_interval_checkempty(it)) {
827 it->empty = 1;
828 return -EINVAL;
829 }
830 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
831 return changed;
832}
833
834/*
835 * If the device supports unusual bit rates, does the request meet these?
836 */
837static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
838 struct snd_usb_substream *subs)
839{
840 struct audioformat *fp;
0717d0f5 841 int *rate_list;
e5779998
DM		 842 int count = 0, needs_knot = 0;
843 int err;
844
5cd5d7c4
CL		 845 kfree(subs->rate_list.list);
846 subs->rate_list.list = NULL;
847
e5779998
DM		 848 list_for_each_entry(fp, &subs->fmt_list, list) {
849 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
850 return 0;
851 count += fp->nr_rates;
852 if (fp->rates & SNDRV_PCM_RATE_KNOT)
853 needs_knot = 1;
854 }
855 if (!needs_knot)
856 return 0;
857
0717d0f5
TI		 858 subs->rate_list.list = rate_list =
859 kmalloc(sizeof(int) * count, GFP_KERNEL);
8a8d56b2
JJ		 860 if (!subs->rate_list.list)
861 return -ENOMEM;
862 subs->rate_list.count = count;
e5779998
DM		 863 subs->rate_list.mask = 0;
864 count = 0;
865 list_for_each_entry(fp, &subs->fmt_list, list) {
866 int i;
867 for (i = 0; i < fp->nr_rates; i++)
0717d0f5 868 rate_list[count++] = fp->rate_table[i];
e5779998
DM		 869 }
870 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
871 &subs->rate_list);
872 if (err < 0)
873 return err;
874
875 return 0;
876}
877
878
879/*
880 * set up the runtime hardware information.
881 */
882
883static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
884{
885 struct list_head *p;
886 unsigned int pt, ptmin;
887 int param_period_time_if_needed;
888 int err;
889
890 runtime->hw.formats = subs->formats;
891
892 runtime->hw.rate_min = 0x7fffffff;
893 runtime->hw.rate_max = 0;
894 runtime->hw.channels_min = 256;
895 runtime->hw.channels_max = 0;
896 runtime->hw.rates = 0;
897 ptmin = UINT_MAX;
898 /* check min/max rates and channels */
899 list_for_each(p, &subs->fmt_list) {
900 struct audioformat *fp;
901 fp = list_entry(p, struct audioformat, list);
902 runtime->hw.rates |= fp->rates;
903 if (runtime->hw.rate_min > fp->rate_min)
904 runtime->hw.rate_min = fp->rate_min;
905 if (runtime->hw.rate_max < fp->rate_max)
906 runtime->hw.rate_max = fp->rate_max;
907 if (runtime->hw.channels_min > fp->channels)
908 runtime->hw.channels_min = fp->channels;
909 if (runtime->hw.channels_max < fp->channels)
910 runtime->hw.channels_max = fp->channels;
911 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
912 /* FIXME: there might be more than one audio formats... */
913 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
914 fp->frame_size;
915 }
916 pt = 125 * (1 << fp->datainterval);
917 ptmin = min(ptmin, pt);
918 }
88a8516a
ON		 919 err = snd_usb_autoresume(subs->stream->chip);
920 if (err < 0)
921 return err;
e5779998
DM		 922
923 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
4f4e8f69 924 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
e5779998
DM		 925 /* full speed devices have fixed data packet interval */
926 ptmin = 1000;
927 if (ptmin == 1000)
928 /* if period time doesn't go below 1 ms, no rules needed */
929 param_period_time_if_needed = -1;
930 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
931 ptmin, UINT_MAX);
932
933 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
934 hw_rule_rate, subs,
935 SNDRV_PCM_HW_PARAM_FORMAT,
936 SNDRV_PCM_HW_PARAM_CHANNELS,
937 param_period_time_if_needed,
938 -1)) < 0)
88a8516a 939 goto rep_err;
e5779998
DM		 940 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
941 hw_rule_channels, subs,
942 SNDRV_PCM_HW_PARAM_FORMAT,
943 SNDRV_PCM_HW_PARAM_RATE,
944 param_period_time_if_needed,
945 -1)) < 0)
88a8516a 946 goto rep_err;
e5779998
DM		 947 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
948 hw_rule_format, subs,
949 SNDRV_PCM_HW_PARAM_RATE,
950 SNDRV_PCM_HW_PARAM_CHANNELS,
951 param_period_time_if_needed,
952 -1)) < 0)
88a8516a 953 goto rep_err;
e5779998
DM		 954 if (param_period_time_if_needed >= 0) {
955 err = snd_pcm_hw_rule_add(runtime, 0,
956 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
957 hw_rule_period_time, subs,
958 SNDRV_PCM_HW_PARAM_FORMAT,
959 SNDRV_PCM_HW_PARAM_CHANNELS,
960 SNDRV_PCM_HW_PARAM_RATE,
961 -1);
962 if (err < 0)
88a8516a 963 goto rep_err;
e5779998
DM		 964 }
965 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
88a8516a 966 goto rep_err;
e5779998 967 return 0;
88a8516a
ON		 968
969rep_err:
970 snd_usb_autosuspend(subs->stream->chip);
971 return err;
e5779998
DM		 972}
973
974static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
975{
976 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
977 struct snd_pcm_runtime *runtime = substream->runtime;
978 struct snd_usb_substream *subs = &as->substream[direction];
979
980 subs->interface = -1;
e11b4e0e 981 subs->altset_idx = 0;
e5779998
DM		 982 runtime->hw = snd_usb_hardware;
983 runtime->private_data = subs;
984 subs->pcm_substream = substream;
88a8516a 985 /* runtime PM is also done there */
e5779998
DM		 986 return setup_hw_info(runtime, subs);
987}
988
989static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
990{
991 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
992 struct snd_usb_substream *subs = &as->substream[direction];
993
edcd3633 994 stop_endpoints(subs, 0, 0, 0);
68e67f40
DM		 995
996 if (!as->chip->shutdown && subs->interface >= 0) {
997 usb_set_interface(subs->dev, subs->interface, 0);
998 subs->interface = -1;
999 }
1000
e5779998 1001 subs->pcm_substream = NULL;
88a8516a 1002 snd_usb_autosuspend(subs->stream->chip);
edcd3633 1003
68e67f40 1004 return 0;
edcd3633
DM		 1005}
1006
1007/* Since a URB can handle only a single linear buffer, we must use double
1008 * buffering when the data to be transferred overflows the buffer boundary.
1009 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1010 * for all URBs.
1011 */
1012static void retire_capture_urb(struct snd_usb_substream *subs,
1013 struct urb *urb)
1014{
1015 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1016 unsigned int stride, frames, bytes, oldptr;
1017 int i, period_elapsed = 0;
1018 unsigned long flags;
1019 unsigned char *cp;
1020
1021 stride = runtime->frame_bits >> 3;
1022
1023 for (i = 0; i < urb->number_of_packets; i++) {
1024 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1025 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1026 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1027 // continue;
1028 }
1029 bytes = urb->iso_frame_desc[i].actual_length;
1030 frames = bytes / stride;
1031 if (!subs->txfr_quirk)
1032 bytes = frames * stride;
1033 if (bytes % (runtime->sample_bits >> 3) != 0) {
1034#ifdef CONFIG_SND_DEBUG_VERBOSE
1035 int oldbytes = bytes;
1036#endif
1037 bytes = frames * stride;
1038 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1039 oldbytes, bytes);
1040 }
1041 /* update the current pointer */
1042 spin_lock_irqsave(&subs->lock, flags);
1043 oldptr = subs->hwptr_done;
1044 subs->hwptr_done += bytes;
1045 if (subs->hwptr_done >= runtime->buffer_size * stride)
1046 subs->hwptr_done -= runtime->buffer_size * stride;
1047 frames = (bytes + (oldptr % stride)) / stride;
1048 subs->transfer_done += frames;
1049 if (subs->transfer_done >= runtime->period_size) {
1050 subs->transfer_done -= runtime->period_size;
1051 period_elapsed = 1;
1052 }
1053 spin_unlock_irqrestore(&subs->lock, flags);
1054 /* copy a data chunk */
1055 if (oldptr + bytes > runtime->buffer_size * stride) {
1056 unsigned int bytes1 =
1057 runtime->buffer_size * stride - oldptr;
1058 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1059 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1060 } else {
1061 memcpy(runtime->dma_area + oldptr, cp, bytes);
1062 }
1063 }
1064
1065 if (period_elapsed)
1066 snd_pcm_period_elapsed(subs->pcm_substream);
1067}
1068
1069static void prepare_playback_urb(struct snd_usb_substream *subs,
1070 struct urb *urb)
1071{
1072 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
245baf98 1073 struct snd_usb_endpoint *ep = subs->data_endpoint;
edcd3633
DM		 1074 struct snd_urb_ctx *ctx = urb->context;
1075 unsigned int counts, frames, bytes;
1076 int i, stride, period_elapsed = 0;
1077 unsigned long flags;
1078
1079 stride = runtime->frame_bits >> 3;
1080
1081 frames = 0;
1082 urb->number_of_packets = 0;
1083 spin_lock_irqsave(&subs->lock, flags);
1084 for (i = 0; i < ctx->packets; i++) {
245baf98
DM		 1085 if (ctx->packet_size[i])
1086 counts = ctx->packet_size[i];
1087 else
1088 counts = snd_usb_endpoint_next_packet_size(ep);
1089
edcd3633
DM		 1090 /* set up descriptor */
1091 urb->iso_frame_desc[i].offset = frames * stride;
1092 urb->iso_frame_desc[i].length = counts * stride;
1093 frames += counts;
1094 urb->number_of_packets++;
1095 subs->transfer_done += counts;
1096 if (subs->transfer_done >= runtime->period_size) {
1097 subs->transfer_done -= runtime->period_size;
1098 period_elapsed = 1;
1099 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1100 if (subs->transfer_done > 0) {
1101 /* FIXME: fill-max mode is not
1102 * supported yet */
1103 frames -= subs->transfer_done;
1104 counts -= subs->transfer_done;
1105 urb->iso_frame_desc[i].length =
1106 counts * stride;
1107 subs->transfer_done = 0;
1108 }
1109 i++;
1110 if (i < ctx->packets) {
1111 /* add a transfer delimiter */
1112 urb->iso_frame_desc[i].offset =
1113 frames * stride;
1114 urb->iso_frame_desc[i].length = 0;
1115 urb->number_of_packets++;
1116 }
1117 break;
1118 }
1119 }
1120 if (period_elapsed &&
1121 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1122 break;
1123 }
1124 bytes = frames * stride;
1125 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1126 /* err, the transferred area goes over buffer boundary. */
1127 unsigned int bytes1 =
1128 runtime->buffer_size * stride - subs->hwptr_done;
1129 memcpy(urb->transfer_buffer,
1130 runtime->dma_area + subs->hwptr_done, bytes1);
1131 memcpy(urb->transfer_buffer + bytes1,
1132 runtime->dma_area, bytes - bytes1);
1133 } else {
1134 memcpy(urb->transfer_buffer,
1135 runtime->dma_area + subs->hwptr_done, bytes);
1136 }
1137 subs->hwptr_done += bytes;
1138 if (subs->hwptr_done >= runtime->buffer_size * stride)
1139 subs->hwptr_done -= runtime->buffer_size * stride;
fbcfbf5f
DM		 1140
1141 /* update delay with exact number of samples queued */
1142 runtime->delay = subs->last_delay;
edcd3633 1143 runtime->delay += frames;
fbcfbf5f
DM		 1144 subs->last_delay = runtime->delay;
1145
1146 /* realign last_frame_number */
1147 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1148 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1149
edcd3633
DM		 1150 spin_unlock_irqrestore(&subs->lock, flags);
1151 urb->transfer_buffer_length = bytes;
1152 if (period_elapsed)
1153 snd_pcm_period_elapsed(subs->pcm_substream);
1154}
1155
1156/*
1157 * process after playback data complete
1158 * - decrease the delay count again
1159 */
1160static void retire_playback_urb(struct snd_usb_substream *subs,
1161 struct urb *urb)
1162{
1163 unsigned long flags;
1164 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1165 int stride = runtime->frame_bits >> 3;
1166 int processed = urb->transfer_buffer_length / stride;
fbcfbf5f 1167 int est_delay;
edcd3633 1168
1213a205
TI		 1169 /* ignore the delay accounting when procssed=0 is given, i.e.
1170 * silent payloads are procssed before handling the actual data
1171 */
1172 if (!processed)
1173 return;
1174
edcd3633 1175 spin_lock_irqsave(&subs->lock, flags);
fbcfbf5f
DM		 1176 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1177 /* update delay with exact number of samples played */
1178 if (processed > subs->last_delay)
1179 subs->last_delay = 0;
edcd3633 1180 else
fbcfbf5f
DM		 1181 subs->last_delay -= processed;
1182 runtime->delay = subs->last_delay;
1183
1184 /*
1185 * Report when delay estimate is off by more than 2ms.
1186 * The error should be lower than 2ms since the estimate relies
1187 * on two reads of a counter updated every ms.
1188 */
1189 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1190 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1191 est_delay, subs->last_delay);
1192
edcd3633 1193 spin_unlock_irqrestore(&subs->lock, flags);
e5779998
DM		 1194}
1195
1196static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1197{
1198 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1199}
1200
1201static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1202{
1203 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1204}
1205
1206static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1207{
1208 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1209}
1210
1211static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1212{
1213 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1214}
1215
edcd3633
DM		 1216static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1217 int cmd)
1218{
1219 struct snd_usb_substream *subs = substream->runtime->private_data;
1220
1221 switch (cmd) {
1222 case SNDRV_PCM_TRIGGER_START:
1223 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1224 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1225 subs->data_endpoint->retire_data_urb = retire_playback_urb;
97f8d3b6 1226 subs->running = 1;
edcd3633
DM		 1227 return 0;
1228 case SNDRV_PCM_TRIGGER_STOP:
1229 stop_endpoints(subs, 0, 0, 0);
97f8d3b6 1230 subs->running = 0;
edcd3633
DM		 1231 return 0;
1232 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1233 subs->data_endpoint->prepare_data_urb = NULL;
1234 subs->data_endpoint->retire_data_urb = NULL;
97f8d3b6 1235 subs->running = 0;
edcd3633
DM		 1236 return 0;
1237 }
1238
1239 return -EINVAL;
1240}
1241
afe25967
DM		 1242static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1243 int cmd)
edcd3633
DM		 1244{
1245 int err;
1246 struct snd_usb_substream *subs = substream->runtime->private_data;
1247
1248 switch (cmd) {
1249 case SNDRV_PCM_TRIGGER_START:
015618b9 1250 err = start_endpoints(subs, 0);
edcd3633
DM		 1251 if (err < 0)
1252 return err;
1253
1254 subs->data_endpoint->retire_data_urb = retire_capture_urb;
97f8d3b6 1255 subs->running = 1;
edcd3633
DM		 1256 return 0;
1257 case SNDRV_PCM_TRIGGER_STOP:
1258 stop_endpoints(subs, 0, 0, 0);
97f8d3b6 1259 subs->running = 0;
edcd3633
DM		 1260 return 0;
1261 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1262 subs->data_endpoint->retire_data_urb = NULL;
97f8d3b6 1263 subs->running = 0;
edcd3633
DM		 1264 return 0;
1265 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1266 subs->data_endpoint->retire_data_urb = retire_capture_urb;
97f8d3b6 1267 subs->running = 1;
edcd3633
DM		 1268 return 0;
1269 }
1270
1271 return -EINVAL;
1272}
1273
e5779998
DM		 1274static struct snd_pcm_ops snd_usb_playback_ops = {
1275 .open = snd_usb_playback_open,
1276 .close = snd_usb_playback_close,
1277 .ioctl = snd_pcm_lib_ioctl,
1278 .hw_params = snd_usb_hw_params,
1279 .hw_free = snd_usb_hw_free,
1280 .prepare = snd_usb_pcm_prepare,
1281 .trigger = snd_usb_substream_playback_trigger,
1282 .pointer = snd_usb_pcm_pointer,
1283 .page = snd_pcm_lib_get_vmalloc_page,
1284 .mmap = snd_pcm_lib_mmap_vmalloc,
1285};
1286
1287static struct snd_pcm_ops snd_usb_capture_ops = {
1288 .open = snd_usb_capture_open,
1289 .close = snd_usb_capture_close,
1290 .ioctl = snd_pcm_lib_ioctl,
1291 .hw_params = snd_usb_hw_params,
1292 .hw_free = snd_usb_hw_free,
1293 .prepare = snd_usb_pcm_prepare,
1294 .trigger = snd_usb_substream_capture_trigger,
1295 .pointer = snd_usb_pcm_pointer,
1296 .page = snd_pcm_lib_get_vmalloc_page,
1297 .mmap = snd_pcm_lib_mmap_vmalloc,
1298};
1299
1300void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1301{
1302 snd_pcm_set_ops(pcm, stream,
1303 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1304 &snd_usb_playback_ops : &snd_usb_capture_ops);
1305}
Linux kernel - Deliverables
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