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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 */
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
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;
76 substream->runtime->delay = snd_usb_pcm_delay(subs,
77 substream->runtime->rate);
78 spin_unlock(&subs->lock);
79 return hwptr_done / (substream->runtime->frame_bits >> 3);
80}
81
82/*
83 * find a matching audio format
84 */
85static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
86 unsigned int rate, unsigned int channels)
87{
88 struct list_head *p;
89 struct audioformat *found = NULL;
90 int cur_attr = 0, attr;
91
92 list_for_each(p, &subs->fmt_list) {
93 struct audioformat *fp;
94 fp = list_entry(p, struct audioformat, list);
95 if (!(fp->formats & (1uLL << format)))
96 continue;
97 if (fp->channels != channels)
98 continue;
99 if (rate < fp->rate_min || rate > fp->rate_max)
100 continue;
101 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
102 unsigned int i;
103 for (i = 0; i < fp->nr_rates; i++)
104 if (fp->rate_table[i] == rate)
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
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
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,
159 data, sizeof(data))) < 0) {
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}
167
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,
183 data, sizeof(data))) < 0) {
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
192/*
193 * initialize the pitch control and sample rate
194 */
195int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
196 struct usb_host_interface *alts,
197 struct audioformat *fmt)
198{
199 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
200
201 /* if endpoint doesn't have pitch control, bail out */
202 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
203 return 0;
204
205 switch (altsd->bInterfaceProtocol) {
206 case UAC_VERSION_1:
207 default:
208 return init_pitch_v1(chip, iface, alts, fmt);
209
210 case UAC_VERSION_2:
211 return init_pitch_v2(chip, iface, alts, fmt);
212 }
213}
214
215static int start_endpoints(struct snd_usb_substream *subs, int can_sleep)
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;
228 err = snd_usb_endpoint_start(ep, can_sleep);
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
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
254 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
255
256 ep->sync_slave = subs->data_endpoint;
257 err = snd_usb_endpoint_start(ep, can_sleep);
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
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
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;
306 int err, implicit_fb = 0;
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
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
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;
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;
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;
364 ep = 0x81;
365 iface = usb_ifnum_to_if(dev, 2);
366
367 if (!iface || iface->num_altsetting == 0)
368 return -EINVAL;
369
370 alts = &iface->altsetting[1];
371 goto add_sync_ep;
372 }
373 }
374
375 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
376 (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
377 altsd->bNumEndpoints >= 2) {
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 &&
384 get_endpoint(alts, 1)->bSynchAddress != 0 &&
385 !implicit_fb)) {
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);
391 return -EINVAL;
392 }
393 ep = get_endpoint(alts, 1)->bEndpointAddress;
394 if (!implicit_fb &&
395 get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
396 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
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);
401 return -EINVAL;
402 }
403
404 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
405 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
406
407add_sync_ep:
408 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
409 alts, ep, !subs->direction,
410 implicit_fb ?
411 SND_USB_ENDPOINT_TYPE_DATA :
412 SND_USB_ENDPOINT_TYPE_SYNC);
413 if (!subs->sync_endpoint)
414 return -EINVAL;
415
416 subs->data_endpoint->sync_master = subs->sync_endpoint;
417 }
418
419 if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
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
438/*
439 * hw_params callback
440 *
441 * allocate a buffer and set the given audio format.
442 *
443 * so far we use a physically linear buffer although packetize transfer
444 * doesn't need a continuous area.
445 * if sg buffer is supported on the later version of alsa, we'll follow
446 * that.
447 */
448static int snd_usb_hw_params(struct snd_pcm_substream *substream,
449 struct snd_pcm_hw_params *hw_params)
450{
451 struct snd_usb_substream *subs = substream->runtime->private_data;
452 struct audioformat *fmt;
453 unsigned int channels, rate, format;
454 int ret, changed;
455
456 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
457 params_buffer_bytes(hw_params));
458 if (ret < 0)
459 return ret;
460
461 format = params_format(hw_params);
462 rate = params_rate(hw_params);
463 channels = params_channels(hw_params);
464 fmt = find_format(subs, format, rate, channels);
465 if (!fmt) {
466 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
467 format, rate, channels);
468 return -EINVAL;
469 }
470
471 changed = subs->cur_audiofmt != fmt ||
472 subs->period_bytes != params_period_bytes(hw_params) ||
473 subs->cur_rate != rate;
474 if ((ret = set_format(subs, fmt)) < 0)
475 return ret;
476
477 if (subs->cur_rate != rate) {
478 struct usb_host_interface *alts;
479 struct usb_interface *iface;
480 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
481 alts = &iface->altsetting[fmt->altset_idx];
482 ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate);
483 if (ret < 0)
484 return ret;
485 subs->cur_rate = rate;
486 }
487
488 if (changed) {
489 mutex_lock(&subs->stream->chip->shutdown_mutex);
490 /* format changed */
491 stop_endpoints(subs, 0, 0, 0);
492 ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
493 subs->sync_endpoint);
494 if (ret < 0)
495 goto unlock;
496
497 if (subs->sync_endpoint)
498 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
499 hw_params, fmt, NULL);
500unlock:
501 mutex_unlock(&subs->stream->chip->shutdown_mutex);
502 }
503
504 if (ret == 0) {
505 subs->interface = fmt->iface;
506 subs->altset_idx = fmt->altset_idx;
507 }
508
509 return ret;
510}
511
512/*
513 * hw_free callback
514 *
515 * reset the audio format and release the buffer
516 */
517static int snd_usb_hw_free(struct snd_pcm_substream *substream)
518{
519 struct snd_usb_substream *subs = substream->runtime->private_data;
520
521 subs->cur_audiofmt = NULL;
522 subs->cur_rate = 0;
523 subs->period_bytes = 0;
524 mutex_lock(&subs->stream->chip->shutdown_mutex);
525 stop_endpoints(subs, 0, 1, 1);
526 deactivate_endpoints(subs);
527 mutex_unlock(&subs->stream->chip->shutdown_mutex);
528 return snd_pcm_lib_free_vmalloc_buffer(substream);
529}
530
531/*
532 * prepare callback
533 *
534 * only a few subtle things...
535 */
536static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
537{
538 struct snd_pcm_runtime *runtime = substream->runtime;
539 struct snd_usb_substream *subs = runtime->private_data;
540
541 if (! subs->cur_audiofmt) {
542 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
543 return -ENXIO;
544 }
545
546 if (snd_BUG_ON(!subs->data_endpoint))
547 return -EIO;
548
549 /* some unit conversions in runtime */
550 subs->data_endpoint->maxframesize =
551 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
552 subs->data_endpoint->curframesize =
553 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
554
555 /* reset the pointer */
556 subs->hwptr_done = 0;
557 subs->transfer_done = 0;
558 subs->last_delay = 0;
559 subs->last_frame_number = 0;
560 runtime->delay = 0;
561
562 /* for playback, submit the URBs now; otherwise, the first hwptr_done
563 * updates for all URBs would happen at the same time when starting */
564 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
565 return start_endpoints(subs, 1);
566
567 return 0;
568}
569
570static struct snd_pcm_hardware snd_usb_hardware =
571{
572 .info = SNDRV_PCM_INFO_MMAP |
573 SNDRV_PCM_INFO_MMAP_VALID |
574 SNDRV_PCM_INFO_BATCH |
575 SNDRV_PCM_INFO_INTERLEAVED |
576 SNDRV_PCM_INFO_BLOCK_TRANSFER |
577 SNDRV_PCM_INFO_PAUSE,
578 .buffer_bytes_max = 1024 * 1024,
579 .period_bytes_min = 64,
580 .period_bytes_max = 512 * 1024,
581 .periods_min = 2,
582 .periods_max = 1024,
583};
584
585static int hw_check_valid_format(struct snd_usb_substream *subs,
586 struct snd_pcm_hw_params *params,
587 struct audioformat *fp)
588{
589 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
590 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
591 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
592 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
593 struct snd_mask check_fmts;
594 unsigned int ptime;
595
596 /* check the format */
597 snd_mask_none(&check_fmts);
598 check_fmts.bits[0] = (u32)fp->formats;
599 check_fmts.bits[1] = (u32)(fp->formats >> 32);
600 snd_mask_intersect(&check_fmts, fmts);
601 if (snd_mask_empty(&check_fmts)) {
602 hwc_debug(" > check: no supported format %d\n", fp->format);
603 return 0;
604 }
605 /* check the channels */
606 if (fp->channels < ct->min || fp->channels > ct->max) {
607 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
608 return 0;
609 }
610 /* check the rate is within the range */
611 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
612 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
613 return 0;
614 }
615 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
616 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
617 return 0;
618 }
619 /* check whether the period time is >= the data packet interval */
620 if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
621 ptime = 125 * (1 << fp->datainterval);
622 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
623 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
624 return 0;
625 }
626 }
627 return 1;
628}
629
630static int hw_rule_rate(struct snd_pcm_hw_params *params,
631 struct snd_pcm_hw_rule *rule)
632{
633 struct snd_usb_substream *subs = rule->private;
634 struct list_head *p;
635 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
636 unsigned int rmin, rmax;
637 int changed;
638
639 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
640 changed = 0;
641 rmin = rmax = 0;
642 list_for_each(p, &subs->fmt_list) {
643 struct audioformat *fp;
644 fp = list_entry(p, struct audioformat, list);
645 if (!hw_check_valid_format(subs, params, fp))
646 continue;
647 if (changed++) {
648 if (rmin > fp->rate_min)
649 rmin = fp->rate_min;
650 if (rmax < fp->rate_max)
651 rmax = fp->rate_max;
652 } else {
653 rmin = fp->rate_min;
654 rmax = fp->rate_max;
655 }
656 }
657
658 if (!changed) {
659 hwc_debug(" --> get empty\n");
660 it->empty = 1;
661 return -EINVAL;
662 }
663
664 changed = 0;
665 if (it->min < rmin) {
666 it->min = rmin;
667 it->openmin = 0;
668 changed = 1;
669 }
670 if (it->max > rmax) {
671 it->max = rmax;
672 it->openmax = 0;
673 changed = 1;
674 }
675 if (snd_interval_checkempty(it)) {
676 it->empty = 1;
677 return -EINVAL;
678 }
679 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
680 return changed;
681}
682
683
684static int hw_rule_channels(struct snd_pcm_hw_params *params,
685 struct snd_pcm_hw_rule *rule)
686{
687 struct snd_usb_substream *subs = rule->private;
688 struct list_head *p;
689 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
690 unsigned int rmin, rmax;
691 int changed;
692
693 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
694 changed = 0;
695 rmin = rmax = 0;
696 list_for_each(p, &subs->fmt_list) {
697 struct audioformat *fp;
698 fp = list_entry(p, struct audioformat, list);
699 if (!hw_check_valid_format(subs, params, fp))
700 continue;
701 if (changed++) {
702 if (rmin > fp->channels)
703 rmin = fp->channels;
704 if (rmax < fp->channels)
705 rmax = fp->channels;
706 } else {
707 rmin = fp->channels;
708 rmax = fp->channels;
709 }
710 }
711
712 if (!changed) {
713 hwc_debug(" --> get empty\n");
714 it->empty = 1;
715 return -EINVAL;
716 }
717
718 changed = 0;
719 if (it->min < rmin) {
720 it->min = rmin;
721 it->openmin = 0;
722 changed = 1;
723 }
724 if (it->max > rmax) {
725 it->max = rmax;
726 it->openmax = 0;
727 changed = 1;
728 }
729 if (snd_interval_checkempty(it)) {
730 it->empty = 1;
731 return -EINVAL;
732 }
733 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
734 return changed;
735}
736
737static int hw_rule_format(struct snd_pcm_hw_params *params,
738 struct snd_pcm_hw_rule *rule)
739{
740 struct snd_usb_substream *subs = rule->private;
741 struct list_head *p;
742 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
743 u64 fbits;
744 u32 oldbits[2];
745 int changed;
746
747 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
748 fbits = 0;
749 list_for_each(p, &subs->fmt_list) {
750 struct audioformat *fp;
751 fp = list_entry(p, struct audioformat, list);
752 if (!hw_check_valid_format(subs, params, fp))
753 continue;
754 fbits |= fp->formats;
755 }
756
757 oldbits[0] = fmt->bits[0];
758 oldbits[1] = fmt->bits[1];
759 fmt->bits[0] &= (u32)fbits;
760 fmt->bits[1] &= (u32)(fbits >> 32);
761 if (!fmt->bits[0] && !fmt->bits[1]) {
762 hwc_debug(" --> get empty\n");
763 return -EINVAL;
764 }
765 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
766 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
767 return changed;
768}
769
770static int hw_rule_period_time(struct snd_pcm_hw_params *params,
771 struct snd_pcm_hw_rule *rule)
772{
773 struct snd_usb_substream *subs = rule->private;
774 struct audioformat *fp;
775 struct snd_interval *it;
776 unsigned char min_datainterval;
777 unsigned int pmin;
778 int changed;
779
780 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
781 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
782 min_datainterval = 0xff;
783 list_for_each_entry(fp, &subs->fmt_list, list) {
784 if (!hw_check_valid_format(subs, params, fp))
785 continue;
786 min_datainterval = min(min_datainterval, fp->datainterval);
787 }
788 if (min_datainterval == 0xff) {
789 hwc_debug(" --> get empty\n");
790 it->empty = 1;
791 return -EINVAL;
792 }
793 pmin = 125 * (1 << min_datainterval);
794 changed = 0;
795 if (it->min < pmin) {
796 it->min = pmin;
797 it->openmin = 0;
798 changed = 1;
799 }
800 if (snd_interval_checkempty(it)) {
801 it->empty = 1;
802 return -EINVAL;
803 }
804 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
805 return changed;
806}
807
808/*
809 * If the device supports unusual bit rates, does the request meet these?
810 */
811static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
812 struct snd_usb_substream *subs)
813{
814 struct audioformat *fp;
815 int *rate_list;
816 int count = 0, needs_knot = 0;
817 int err;
818
819 kfree(subs->rate_list.list);
820 subs->rate_list.list = NULL;
821
822 list_for_each_entry(fp, &subs->fmt_list, list) {
823 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
824 return 0;
825 count += fp->nr_rates;
826 if (fp->rates & SNDRV_PCM_RATE_KNOT)
827 needs_knot = 1;
828 }
829 if (!needs_knot)
830 return 0;
831
832 subs->rate_list.list = rate_list =
833 kmalloc(sizeof(int) * count, GFP_KERNEL);
834 if (!subs->rate_list.list)
835 return -ENOMEM;
836 subs->rate_list.count = count;
837 subs->rate_list.mask = 0;
838 count = 0;
839 list_for_each_entry(fp, &subs->fmt_list, list) {
840 int i;
841 for (i = 0; i < fp->nr_rates; i++)
842 rate_list[count++] = fp->rate_table[i];
843 }
844 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
845 &subs->rate_list);
846 if (err < 0)
847 return err;
848
849 return 0;
850}
851
852
853/*
854 * set up the runtime hardware information.
855 */
856
857static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
858{
859 struct list_head *p;
860 unsigned int pt, ptmin;
861 int param_period_time_if_needed;
862 int err;
863
864 runtime->hw.formats = subs->formats;
865
866 runtime->hw.rate_min = 0x7fffffff;
867 runtime->hw.rate_max = 0;
868 runtime->hw.channels_min = 256;
869 runtime->hw.channels_max = 0;
870 runtime->hw.rates = 0;
871 ptmin = UINT_MAX;
872 /* check min/max rates and channels */
873 list_for_each(p, &subs->fmt_list) {
874 struct audioformat *fp;
875 fp = list_entry(p, struct audioformat, list);
876 runtime->hw.rates |= fp->rates;
877 if (runtime->hw.rate_min > fp->rate_min)
878 runtime->hw.rate_min = fp->rate_min;
879 if (runtime->hw.rate_max < fp->rate_max)
880 runtime->hw.rate_max = fp->rate_max;
881 if (runtime->hw.channels_min > fp->channels)
882 runtime->hw.channels_min = fp->channels;
883 if (runtime->hw.channels_max < fp->channels)
884 runtime->hw.channels_max = fp->channels;
885 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
886 /* FIXME: there might be more than one audio formats... */
887 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
888 fp->frame_size;
889 }
890 pt = 125 * (1 << fp->datainterval);
891 ptmin = min(ptmin, pt);
892 }
893 err = snd_usb_autoresume(subs->stream->chip);
894 if (err < 0)
895 return err;
896
897 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
898 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
899 /* full speed devices have fixed data packet interval */
900 ptmin = 1000;
901 if (ptmin == 1000)
902 /* if period time doesn't go below 1 ms, no rules needed */
903 param_period_time_if_needed = -1;
904 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
905 ptmin, UINT_MAX);
906
907 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
908 hw_rule_rate, subs,
909 SNDRV_PCM_HW_PARAM_FORMAT,
910 SNDRV_PCM_HW_PARAM_CHANNELS,
911 param_period_time_if_needed,
912 -1)) < 0)
913 goto rep_err;
914 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
915 hw_rule_channels, subs,
916 SNDRV_PCM_HW_PARAM_FORMAT,
917 SNDRV_PCM_HW_PARAM_RATE,
918 param_period_time_if_needed,
919 -1)) < 0)
920 goto rep_err;
921 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
922 hw_rule_format, subs,
923 SNDRV_PCM_HW_PARAM_RATE,
924 SNDRV_PCM_HW_PARAM_CHANNELS,
925 param_period_time_if_needed,
926 -1)) < 0)
927 goto rep_err;
928 if (param_period_time_if_needed >= 0) {
929 err = snd_pcm_hw_rule_add(runtime, 0,
930 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
931 hw_rule_period_time, subs,
932 SNDRV_PCM_HW_PARAM_FORMAT,
933 SNDRV_PCM_HW_PARAM_CHANNELS,
934 SNDRV_PCM_HW_PARAM_RATE,
935 -1);
936 if (err < 0)
937 goto rep_err;
938 }
939 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
940 goto rep_err;
941 return 0;
942
943rep_err:
944 snd_usb_autosuspend(subs->stream->chip);
945 return err;
946}
947
948static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
949{
950 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
951 struct snd_pcm_runtime *runtime = substream->runtime;
952 struct snd_usb_substream *subs = &as->substream[direction];
953
954 subs->interface = -1;
955 subs->altset_idx = 0;
956 runtime->hw = snd_usb_hardware;
957 runtime->private_data = subs;
958 subs->pcm_substream = substream;
959 /* runtime PM is also done there */
960 return setup_hw_info(runtime, subs);
961}
962
963static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
964{
965 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
966 struct snd_usb_substream *subs = &as->substream[direction];
967
968 stop_endpoints(subs, 0, 0, 0);
969
970 if (!as->chip->shutdown && subs->interface >= 0) {
971 usb_set_interface(subs->dev, subs->interface, 0);
972 subs->interface = -1;
973 }
974
975 subs->pcm_substream = NULL;
976 snd_usb_autosuspend(subs->stream->chip);
977
978 return 0;
979}
980
981/* Since a URB can handle only a single linear buffer, we must use double
982 * buffering when the data to be transferred overflows the buffer boundary.
983 * To avoid inconsistencies when updating hwptr_done, we use double buffering
984 * for all URBs.
985 */
986static void retire_capture_urb(struct snd_usb_substream *subs,
987 struct urb *urb)
988{
989 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
990 unsigned int stride, frames, bytes, oldptr;
991 int i, period_elapsed = 0;
992 unsigned long flags;
993 unsigned char *cp;
994
995 stride = runtime->frame_bits >> 3;
996
997 for (i = 0; i < urb->number_of_packets; i++) {
998 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
999 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1000 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1001 // continue;
1002 }
1003 bytes = urb->iso_frame_desc[i].actual_length;
1004 frames = bytes / stride;
1005 if (!subs->txfr_quirk)
1006 bytes = frames * stride;
1007 if (bytes % (runtime->sample_bits >> 3) != 0) {
1008#ifdef CONFIG_SND_DEBUG_VERBOSE
1009 int oldbytes = bytes;
1010#endif
1011 bytes = frames * stride;
1012 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1013 oldbytes, bytes);
1014 }
1015 /* update the current pointer */
1016 spin_lock_irqsave(&subs->lock, flags);
1017 oldptr = subs->hwptr_done;
1018 subs->hwptr_done += bytes;
1019 if (subs->hwptr_done >= runtime->buffer_size * stride)
1020 subs->hwptr_done -= runtime->buffer_size * stride;
1021 frames = (bytes + (oldptr % stride)) / stride;
1022 subs->transfer_done += frames;
1023 if (subs->transfer_done >= runtime->period_size) {
1024 subs->transfer_done -= runtime->period_size;
1025 period_elapsed = 1;
1026 }
1027 spin_unlock_irqrestore(&subs->lock, flags);
1028 /* copy a data chunk */
1029 if (oldptr + bytes > runtime->buffer_size * stride) {
1030 unsigned int bytes1 =
1031 runtime->buffer_size * stride - oldptr;
1032 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1033 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1034 } else {
1035 memcpy(runtime->dma_area + oldptr, cp, bytes);
1036 }
1037 }
1038
1039 if (period_elapsed)
1040 snd_pcm_period_elapsed(subs->pcm_substream);
1041}
1042
1043static void prepare_playback_urb(struct snd_usb_substream *subs,
1044 struct urb *urb)
1045{
1046 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1047 struct snd_usb_endpoint *ep = subs->data_endpoint;
1048 struct snd_urb_ctx *ctx = urb->context;
1049 unsigned int counts, frames, bytes;
1050 int i, stride, period_elapsed = 0;
1051 unsigned long flags;
1052
1053 stride = runtime->frame_bits >> 3;
1054
1055 frames = 0;
1056 urb->number_of_packets = 0;
1057 spin_lock_irqsave(&subs->lock, flags);
1058 for (i = 0; i < ctx->packets; i++) {
1059 if (ctx->packet_size[i])
1060 counts = ctx->packet_size[i];
1061 else
1062 counts = snd_usb_endpoint_next_packet_size(ep);
1063
1064 /* set up descriptor */
1065 urb->iso_frame_desc[i].offset = frames * stride;
1066 urb->iso_frame_desc[i].length = counts * stride;
1067 frames += counts;
1068 urb->number_of_packets++;
1069 subs->transfer_done += counts;
1070 if (subs->transfer_done >= runtime->period_size) {
1071 subs->transfer_done -= runtime->period_size;
1072 period_elapsed = 1;
1073 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1074 if (subs->transfer_done > 0) {
1075 /* FIXME: fill-max mode is not
1076 * supported yet */
1077 frames -= subs->transfer_done;
1078 counts -= subs->transfer_done;
1079 urb->iso_frame_desc[i].length =
1080 counts * stride;
1081 subs->transfer_done = 0;
1082 }
1083 i++;
1084 if (i < ctx->packets) {
1085 /* add a transfer delimiter */
1086 urb->iso_frame_desc[i].offset =
1087 frames * stride;
1088 urb->iso_frame_desc[i].length = 0;
1089 urb->number_of_packets++;
1090 }
1091 break;
1092 }
1093 }
1094 if (period_elapsed &&
1095 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1096 break;
1097 }
1098 bytes = frames * stride;
1099 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1100 /* err, the transferred area goes over buffer boundary. */
1101 unsigned int bytes1 =
1102 runtime->buffer_size * stride - subs->hwptr_done;
1103 memcpy(urb->transfer_buffer,
1104 runtime->dma_area + subs->hwptr_done, bytes1);
1105 memcpy(urb->transfer_buffer + bytes1,
1106 runtime->dma_area, bytes - bytes1);
1107 } else {
1108 memcpy(urb->transfer_buffer,
1109 runtime->dma_area + subs->hwptr_done, bytes);
1110 }
1111 subs->hwptr_done += bytes;
1112 if (subs->hwptr_done >= runtime->buffer_size * stride)
1113 subs->hwptr_done -= runtime->buffer_size * stride;
1114
1115 /* update delay with exact number of samples queued */
1116 runtime->delay = subs->last_delay;
1117 runtime->delay += frames;
1118 subs->last_delay = runtime->delay;
1119
1120 /* realign last_frame_number */
1121 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1122 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1123
1124 spin_unlock_irqrestore(&subs->lock, flags);
1125 urb->transfer_buffer_length = bytes;
1126 if (period_elapsed)
1127 snd_pcm_period_elapsed(subs->pcm_substream);
1128}
1129
1130/*
1131 * process after playback data complete
1132 * - decrease the delay count again
1133 */
1134static void retire_playback_urb(struct snd_usb_substream *subs,
1135 struct urb *urb)
1136{
1137 unsigned long flags;
1138 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1139 int stride = runtime->frame_bits >> 3;
1140 int processed = urb->transfer_buffer_length / stride;
1141 int est_delay;
1142
1143 /* ignore the delay accounting when procssed=0 is given, i.e.
1144 * silent payloads are procssed before handling the actual data
1145 */
1146 if (!processed)
1147 return;
1148
1149 spin_lock_irqsave(&subs->lock, flags);
1150 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1151 /* update delay with exact number of samples played */
1152 if (processed > subs->last_delay)
1153 subs->last_delay = 0;
1154 else
1155 subs->last_delay -= processed;
1156 runtime->delay = subs->last_delay;
1157
1158 /*
1159 * Report when delay estimate is off by more than 2ms.
1160 * The error should be lower than 2ms since the estimate relies
1161 * on two reads of a counter updated every ms.
1162 */
1163 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1164 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1165 est_delay, subs->last_delay);
1166
1167 spin_unlock_irqrestore(&subs->lock, flags);
1168}
1169
1170static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1171{
1172 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1173}
1174
1175static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1176{
1177 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1178}
1179
1180static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1181{
1182 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1183}
1184
1185static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1186{
1187 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1188}
1189
1190static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1191 int cmd)
1192{
1193 struct snd_usb_substream *subs = substream->runtime->private_data;
1194
1195 switch (cmd) {
1196 case SNDRV_PCM_TRIGGER_START:
1197 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1198 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1199 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1200 subs->running = 1;
1201 return 0;
1202 case SNDRV_PCM_TRIGGER_STOP:
1203 stop_endpoints(subs, 0, 0, 0);
1204 subs->running = 0;
1205 return 0;
1206 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1207 subs->data_endpoint->prepare_data_urb = NULL;
1208 subs->data_endpoint->retire_data_urb = NULL;
1209 subs->running = 0;
1210 return 0;
1211 }
1212
1213 return -EINVAL;
1214}
1215
1216static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1217 int cmd)
1218{
1219 int err;
1220 struct snd_usb_substream *subs = substream->runtime->private_data;
1221
1222 switch (cmd) {
1223 case SNDRV_PCM_TRIGGER_START:
1224 err = start_endpoints(subs, 0);
1225 if (err < 0)
1226 return err;
1227
1228 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1229 subs->running = 1;
1230 return 0;
1231 case SNDRV_PCM_TRIGGER_STOP:
1232 stop_endpoints(subs, 0, 0, 0);
1233 subs->running = 0;
1234 return 0;
1235 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1236 subs->data_endpoint->retire_data_urb = NULL;
1237 subs->running = 0;
1238 return 0;
1239 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1240 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1241 subs->running = 1;
1242 return 0;
1243 }
1244
1245 return -EINVAL;
1246}
1247
1248static struct snd_pcm_ops snd_usb_playback_ops = {
1249 .open = snd_usb_playback_open,
1250 .close = snd_usb_playback_close,
1251 .ioctl = snd_pcm_lib_ioctl,
1252 .hw_params = snd_usb_hw_params,
1253 .hw_free = snd_usb_hw_free,
1254 .prepare = snd_usb_pcm_prepare,
1255 .trigger = snd_usb_substream_playback_trigger,
1256 .pointer = snd_usb_pcm_pointer,
1257 .page = snd_pcm_lib_get_vmalloc_page,
1258 .mmap = snd_pcm_lib_mmap_vmalloc,
1259};
1260
1261static struct snd_pcm_ops snd_usb_capture_ops = {
1262 .open = snd_usb_capture_open,
1263 .close = snd_usb_capture_close,
1264 .ioctl = snd_pcm_lib_ioctl,
1265 .hw_params = snd_usb_hw_params,
1266 .hw_free = snd_usb_hw_free,
1267 .prepare = snd_usb_pcm_prepare,
1268 .trigger = snd_usb_substream_capture_trigger,
1269 .pointer = snd_usb_pcm_pointer,
1270 .page = snd_pcm_lib_get_vmalloc_page,
1271 .mmap = snd_pcm_lib_mmap_vmalloc,
1272};
1273
1274void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1275{
1276 snd_pcm_set_ops(pcm, stream,
1277 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1278 &snd_usb_playback_ops : &snd_usb_capture_ops);
1279}