1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 */
4
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/bitrev.h>
8 #include <linux/ratelimit.h>
9 #include <linux/usb.h>
10 #include <linux/usb/audio.h>
11 #include <linux/usb/audio-v2.h>
12
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16
17 #include "usbaudio.h"
18 #include "card.h"
19 #include "quirks.h"
20 #include "endpoint.h"
21 #include "helper.h"
22 #include "pcm.h"
23 #include "clock.h"
24 #include "power.h"
25 #include "media.h"
26 #include "implicit.h"
27
28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
30
31 /* return the estimated delay based on USB frame counters */
snd_usb_pcm_delay(struct snd_usb_substream * subs,struct snd_pcm_runtime * runtime)32 static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
33 struct snd_pcm_runtime *runtime)
34 {
35 unsigned int current_frame_number;
36 unsigned int frame_diff;
37 int est_delay;
38 int queued;
39
40 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
41 queued = bytes_to_frames(runtime, subs->inflight_bytes);
42 if (!queued)
43 return 0;
44 } else if (!subs->running) {
45 return 0;
46 }
47
48 current_frame_number = usb_get_current_frame_number(subs->dev);
49 /*
50 * HCD implementations use different widths, use lower 8 bits.
51 * The delay will be managed up to 256ms, which is more than
52 * enough
53 */
54 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
55
56 /* Approximation based on number of samples per USB frame (ms),
57 some truncation for 44.1 but the estimate is good enough */
58 est_delay = frame_diff * runtime->rate / 1000;
59
60 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
61 est_delay = queued - est_delay;
62 if (est_delay < 0)
63 est_delay = 0;
64 }
65
66 return est_delay;
67 }
68
69 /*
70 * return the current pcm pointer. just based on the hwptr_done value.
71 */
snd_usb_pcm_pointer(struct snd_pcm_substream * substream)72 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
73 {
74 struct snd_pcm_runtime *runtime = substream->runtime;
75 struct snd_usb_substream *subs = runtime->private_data;
76 unsigned int hwptr_done;
77
78 if (atomic_read(&subs->stream->chip->shutdown))
79 return SNDRV_PCM_POS_XRUN;
80 spin_lock(&subs->lock);
81 hwptr_done = subs->hwptr_done;
82 runtime->delay = snd_usb_pcm_delay(subs, runtime);
83 spin_unlock(&subs->lock);
84 return bytes_to_frames(runtime, hwptr_done);
85 }
86
87 /*
88 * find a matching audio format
89 */
90 static const struct audioformat *
find_format(struct list_head * fmt_list_head,snd_pcm_format_t format,unsigned int rate,unsigned int channels,bool strict_match,struct snd_usb_substream * subs)91 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
92 unsigned int rate, unsigned int channels, bool strict_match,
93 struct snd_usb_substream *subs)
94 {
95 const struct audioformat *fp;
96 const struct audioformat *found = NULL;
97 int cur_attr = 0, attr;
98
99 list_for_each_entry(fp, fmt_list_head, list) {
100 if (strict_match) {
101 if (!(fp->formats & pcm_format_to_bits(format)))
102 continue;
103 if (fp->channels != channels)
104 continue;
105 }
106 if (rate < fp->rate_min || rate > fp->rate_max)
107 continue;
108 if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
109 unsigned int i;
110 for (i = 0; i < fp->nr_rates; i++)
111 if (fp->rate_table[i] == rate)
112 break;
113 if (i >= fp->nr_rates)
114 continue;
115 }
116 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
117 if (!found) {
118 found = fp;
119 cur_attr = attr;
120 continue;
121 }
122 /* avoid async out and adaptive in if the other method
123 * supports the same format.
124 * this is a workaround for the case like
125 * M-audio audiophile USB.
126 */
127 if (subs && attr != cur_attr) {
128 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
129 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
130 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
131 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
132 continue;
133 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
134 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
135 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
136 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
137 found = fp;
138 cur_attr = attr;
139 continue;
140 }
141 }
142 /* find the format with the largest max. packet size */
143 if (fp->maxpacksize > found->maxpacksize) {
144 found = fp;
145 cur_attr = attr;
146 }
147 }
148 return found;
149 }
150
151 static const struct audioformat *
find_substream_format(struct snd_usb_substream * subs,const struct snd_pcm_hw_params * params)152 find_substream_format(struct snd_usb_substream *subs,
153 const struct snd_pcm_hw_params *params)
154 {
155 return find_format(&subs->fmt_list, params_format(params),
156 params_rate(params), params_channels(params),
157 true, subs);
158 }
159
snd_usb_pcm_has_fixed_rate(struct snd_usb_substream * subs)160 bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
161 {
162 const struct audioformat *fp;
163 struct snd_usb_audio *chip;
164 int rate = -1;
165
166 if (!subs)
167 return false;
168 chip = subs->stream->chip;
169 if (!(chip->quirk_flags & QUIRK_FLAG_FIXED_RATE))
170 return false;
171 list_for_each_entry(fp, &subs->fmt_list, list) {
172 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
173 return false;
174 if (fp->nr_rates < 1)
175 continue;
176 if (fp->nr_rates > 1)
177 return false;
178 if (rate < 0) {
179 rate = fp->rate_table[0];
180 continue;
181 }
182 if (rate != fp->rate_table[0])
183 return false;
184 }
185 return true;
186 }
187
init_pitch_v1(struct snd_usb_audio * chip,int ep)188 static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
189 {
190 struct usb_device *dev = chip->dev;
191 unsigned char data[1];
192 int err;
193
194 data[0] = 1;
195 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
196 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
197 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
198 data, sizeof(data));
199 return err;
200 }
201
init_pitch_v2(struct snd_usb_audio * chip,int ep)202 static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
203 {
204 struct usb_device *dev = chip->dev;
205 unsigned char data[1];
206 int err;
207
208 data[0] = 1;
209 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
210 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
211 UAC2_EP_CS_PITCH << 8, 0,
212 data, sizeof(data));
213 return err;
214 }
215
216 /*
217 * initialize the pitch control and sample rate
218 */
snd_usb_init_pitch(struct snd_usb_audio * chip,const struct audioformat * fmt)219 int snd_usb_init_pitch(struct snd_usb_audio *chip,
220 const struct audioformat *fmt)
221 {
222 int err;
223
224 /* if endpoint doesn't have pitch control, bail out */
225 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
226 return 0;
227
228 usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
229
230 switch (fmt->protocol) {
231 case UAC_VERSION_1:
232 err = init_pitch_v1(chip, fmt->endpoint);
233 break;
234 case UAC_VERSION_2:
235 err = init_pitch_v2(chip, fmt->endpoint);
236 break;
237 default:
238 return 0;
239 }
240
241 if (err < 0) {
242 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
243 fmt->endpoint);
244 return err;
245 }
246
247 return 0;
248 }
249
stop_endpoints(struct snd_usb_substream * subs,bool keep_pending)250 static bool stop_endpoints(struct snd_usb_substream *subs, bool keep_pending)
251 {
252 bool stopped = 0;
253
254 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
255 snd_usb_endpoint_stop(subs->sync_endpoint, keep_pending);
256 stopped = true;
257 }
258 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
259 snd_usb_endpoint_stop(subs->data_endpoint, keep_pending);
260 stopped = true;
261 }
262 return stopped;
263 }
264
start_endpoints(struct snd_usb_substream * subs)265 static int start_endpoints(struct snd_usb_substream *subs)
266 {
267 int err;
268
269 if (!subs->data_endpoint)
270 return -EINVAL;
271
272 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
273 err = snd_usb_endpoint_start(subs->data_endpoint);
274 if (err < 0) {
275 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
276 goto error;
277 }
278 }
279
280 if (subs->sync_endpoint &&
281 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
282 err = snd_usb_endpoint_start(subs->sync_endpoint);
283 if (err < 0) {
284 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
285 goto error;
286 }
287 }
288
289 return 0;
290
291 error:
292 stop_endpoints(subs, false);
293 return err;
294 }
295
sync_pending_stops(struct snd_usb_substream * subs)296 static void sync_pending_stops(struct snd_usb_substream *subs)
297 {
298 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
299 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
300 }
301
302 /* PCM sync_stop callback */
snd_usb_pcm_sync_stop(struct snd_pcm_substream * substream)303 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
304 {
305 struct snd_usb_substream *subs = substream->runtime->private_data;
306
307 sync_pending_stops(subs);
308 return 0;
309 }
310
311 /* Set up sync endpoint */
snd_usb_audioformat_set_sync_ep(struct snd_usb_audio * chip,struct audioformat * fmt)312 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
313 struct audioformat *fmt)
314 {
315 struct usb_device *dev = chip->dev;
316 struct usb_host_interface *alts;
317 struct usb_interface_descriptor *altsd;
318 unsigned int ep, attr, sync_attr;
319 bool is_playback;
320 int err;
321
322 if (fmt->sync_ep)
323 return 0; /* already set up */
324
325 alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
326 if (!alts)
327 return 0;
328 altsd = get_iface_desc(alts);
329
330 err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
331 if (err > 0)
332 return 0; /* matched */
333
334 /*
335 * Generic sync EP handling
336 */
337
338 if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2)
339 return 0;
340
341 is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
342 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
343 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
344 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
345 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
346 return 0;
347
348 sync_attr = get_endpoint(alts, 1)->bmAttributes;
349
350 /*
351 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
352 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
353 * error fall back to SYNC mode and don't create sync endpoint
354 */
355
356 /* check sync-pipe endpoint */
357 /* ... and check descriptor size before accessing bSynchAddress
358 because there is a version of the SB Audigy 2 NX firmware lacking
359 the audio fields in the endpoint descriptors */
360 if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
361 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
362 get_endpoint(alts, 1)->bSynchAddress != 0)) {
363 dev_err(&dev->dev,
364 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
365 fmt->iface, fmt->altsetting,
366 get_endpoint(alts, 1)->bmAttributes,
367 get_endpoint(alts, 1)->bLength,
368 get_endpoint(alts, 1)->bSynchAddress);
369 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
370 return 0;
371 return -EINVAL;
372 }
373 ep = get_endpoint(alts, 1)->bEndpointAddress;
374 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
375 get_endpoint(alts, 0)->bSynchAddress != 0 &&
376 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
377 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
378 dev_err(&dev->dev,
379 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
380 fmt->iface, fmt->altsetting,
381 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
382 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
383 return 0;
384 return -EINVAL;
385 }
386
387 fmt->sync_ep = ep;
388 fmt->sync_iface = altsd->bInterfaceNumber;
389 fmt->sync_altsetting = altsd->bAlternateSetting;
390 fmt->sync_ep_idx = 1;
391 if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
392 fmt->implicit_fb = 1;
393
394 dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
395 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
396 fmt->sync_altsetting, fmt->implicit_fb);
397
398 return 0;
399 }
400
snd_usb_pcm_change_state(struct snd_usb_substream * subs,int state)401 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
402 {
403 int ret;
404
405 if (!subs->str_pd)
406 return 0;
407
408 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
409 if (ret < 0) {
410 dev_err(&subs->dev->dev,
411 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
412 subs->str_pd->pd_id, state, ret);
413 return ret;
414 }
415
416 return 0;
417 }
418
snd_usb_pcm_suspend(struct snd_usb_stream * as)419 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
420 {
421 int ret;
422
423 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
424 if (ret < 0)
425 return ret;
426
427 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
428 if (ret < 0)
429 return ret;
430
431 return 0;
432 }
433
snd_usb_pcm_resume(struct snd_usb_stream * as)434 int snd_usb_pcm_resume(struct snd_usb_stream *as)
435 {
436 int ret;
437
438 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
439 if (ret < 0)
440 return ret;
441
442 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
443 if (ret < 0)
444 return ret;
445
446 return 0;
447 }
448
close_endpoints(struct snd_usb_audio * chip,struct snd_usb_substream * subs)449 static void close_endpoints(struct snd_usb_audio *chip,
450 struct snd_usb_substream *subs)
451 {
452 if (subs->data_endpoint) {
453 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
454 snd_usb_endpoint_close(chip, subs->data_endpoint);
455 subs->data_endpoint = NULL;
456 }
457
458 if (subs->sync_endpoint) {
459 snd_usb_endpoint_close(chip, subs->sync_endpoint);
460 subs->sync_endpoint = NULL;
461 }
462 }
463
464 /*
465 * hw_params callback
466 *
467 * allocate a buffer and set the given audio format.
468 *
469 * so far we use a physically linear buffer although packetize transfer
470 * doesn't need a continuous area.
471 * if sg buffer is supported on the later version of alsa, we'll follow
472 * that.
473 */
snd_usb_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)474 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
475 struct snd_pcm_hw_params *hw_params)
476 {
477 struct snd_usb_substream *subs = substream->runtime->private_data;
478 struct snd_usb_audio *chip = subs->stream->chip;
479 const struct audioformat *fmt;
480 const struct audioformat *sync_fmt;
481 bool fixed_rate, sync_fixed_rate;
482 int ret;
483
484 ret = snd_media_start_pipeline(subs);
485 if (ret)
486 return ret;
487
488 fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
489 fmt = find_substream_format(subs, hw_params);
490 if (!fmt) {
491 usb_audio_dbg(chip,
492 "cannot find format: format=%s, rate=%d, channels=%d\n",
493 snd_pcm_format_name(params_format(hw_params)),
494 params_rate(hw_params), params_channels(hw_params));
495 ret = -EINVAL;
496 goto stop_pipeline;
497 }
498
499 if (fmt->implicit_fb) {
500 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
501 hw_params,
502 !substream->stream,
503 &sync_fixed_rate);
504 if (!sync_fmt) {
505 usb_audio_dbg(chip,
506 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
507 fmt->sync_ep, fmt->sync_iface,
508 fmt->sync_altsetting,
509 snd_pcm_format_name(params_format(hw_params)),
510 params_rate(hw_params), params_channels(hw_params));
511 ret = -EINVAL;
512 goto stop_pipeline;
513 }
514 } else {
515 sync_fmt = fmt;
516 sync_fixed_rate = fixed_rate;
517 }
518
519 ret = snd_usb_lock_shutdown(chip);
520 if (ret < 0)
521 goto stop_pipeline;
522
523 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
524 if (ret < 0)
525 goto unlock;
526
527 if (subs->data_endpoint) {
528 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
529 fmt, hw_params))
530 goto unlock;
531 if (stop_endpoints(subs, false))
532 sync_pending_stops(subs);
533 close_endpoints(chip, subs);
534 }
535
536 subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false, fixed_rate);
537 if (!subs->data_endpoint) {
538 ret = -EINVAL;
539 goto unlock;
540 }
541
542 if (fmt->sync_ep) {
543 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
544 hw_params,
545 fmt == sync_fmt,
546 sync_fixed_rate);
547 if (!subs->sync_endpoint) {
548 ret = -EINVAL;
549 goto unlock;
550 }
551
552 snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
553 subs->sync_endpoint);
554 }
555
556 mutex_lock(&chip->mutex);
557 subs->cur_audiofmt = fmt;
558 mutex_unlock(&chip->mutex);
559
560 if (!subs->data_endpoint->need_setup)
561 goto unlock;
562
563 if (subs->sync_endpoint) {
564 ret = snd_usb_endpoint_set_params(chip, subs->sync_endpoint);
565 if (ret < 0)
566 goto unlock;
567 }
568
569 ret = snd_usb_endpoint_set_params(chip, subs->data_endpoint);
570
571 unlock:
572 if (ret < 0)
573 close_endpoints(chip, subs);
574
575 snd_usb_unlock_shutdown(chip);
576 stop_pipeline:
577 if (ret < 0)
578 snd_media_stop_pipeline(subs);
579
580 return ret;
581 }
582
583 /*
584 * hw_free callback
585 *
586 * reset the audio format and release the buffer
587 */
snd_usb_hw_free(struct snd_pcm_substream * substream)588 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
589 {
590 struct snd_usb_substream *subs = substream->runtime->private_data;
591 struct snd_usb_audio *chip = subs->stream->chip;
592
593 snd_media_stop_pipeline(subs);
594 mutex_lock(&chip->mutex);
595 subs->cur_audiofmt = NULL;
596 mutex_unlock(&chip->mutex);
597 if (!snd_usb_lock_shutdown(chip)) {
598 if (stop_endpoints(subs, false))
599 sync_pending_stops(subs);
600 close_endpoints(chip, subs);
601 snd_usb_unlock_shutdown(chip);
602 }
603
604 return 0;
605 }
606
607 /* free-wheeling mode? (e.g. dmix) */
in_free_wheeling_mode(struct snd_pcm_runtime * runtime)608 static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime)
609 {
610 return runtime->stop_threshold > runtime->buffer_size;
611 }
612
613 /* check whether early start is needed for playback stream */
lowlatency_playback_available(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)614 static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
615 struct snd_usb_substream *subs)
616 {
617 struct snd_usb_audio *chip = subs->stream->chip;
618
619 if (subs->direction == SNDRV_PCM_STREAM_CAPTURE)
620 return false;
621 /* disabled via module option? */
622 if (!chip->lowlatency)
623 return false;
624 if (in_free_wheeling_mode(runtime))
625 return false;
626 /* implicit feedback mode has own operation mode */
627 if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint))
628 return false;
629 return true;
630 }
631
632 /*
633 * prepare callback
634 *
635 * only a few subtle things...
636 */
snd_usb_pcm_prepare(struct snd_pcm_substream * substream)637 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
638 {
639 struct snd_pcm_runtime *runtime = substream->runtime;
640 struct snd_usb_substream *subs = runtime->private_data;
641 struct snd_usb_audio *chip = subs->stream->chip;
642 int retry = 0;
643 int ret;
644
645 ret = snd_usb_lock_shutdown(chip);
646 if (ret < 0)
647 return ret;
648 if (snd_BUG_ON(!subs->data_endpoint)) {
649 ret = -EIO;
650 goto unlock;
651 }
652
653 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
654 if (ret < 0)
655 goto unlock;
656
657 again:
658 if (subs->sync_endpoint) {
659 ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
660 if (ret < 0)
661 goto unlock;
662 }
663
664 ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
665 if (ret < 0)
666 goto unlock;
667 else if (ret > 0)
668 snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
669 ret = 0;
670
671 /* reset the pointer */
672 subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
673 subs->inflight_bytes = 0;
674 subs->hwptr_done = 0;
675 subs->transfer_done = 0;
676 subs->last_frame_number = 0;
677 subs->period_elapsed_pending = 0;
678 runtime->delay = 0;
679
680 subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
681 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
682 !subs->lowlatency_playback) {
683 ret = start_endpoints(subs);
684 /* if XRUN happens at starting streams (possibly with implicit
685 * fb case), restart again, but only try once.
686 */
687 if (ret == -EPIPE && !retry++) {
688 sync_pending_stops(subs);
689 goto again;
690 }
691 }
692 unlock:
693 snd_usb_unlock_shutdown(chip);
694 return ret;
695 }
696
697 /*
698 * h/w constraints
699 */
700
701 #ifdef HW_CONST_DEBUG
702 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
703 #else
704 #define hwc_debug(fmt, args...) do { } while(0)
705 #endif
706
707 static const struct snd_pcm_hardware snd_usb_hardware =
708 {
709 .info = SNDRV_PCM_INFO_MMAP |
710 SNDRV_PCM_INFO_MMAP_VALID |
711 SNDRV_PCM_INFO_BATCH |
712 SNDRV_PCM_INFO_INTERLEAVED |
713 SNDRV_PCM_INFO_BLOCK_TRANSFER |
714 SNDRV_PCM_INFO_PAUSE,
715 .channels_min = 1,
716 .channels_max = 256,
717 .buffer_bytes_max = INT_MAX, /* limited by BUFFER_TIME later */
718 .period_bytes_min = 64,
719 .period_bytes_max = INT_MAX, /* limited by PERIOD_TIME later */
720 .periods_min = 2,
721 .periods_max = 1024,
722 };
723
hw_check_valid_format(struct snd_usb_substream * subs,struct snd_pcm_hw_params * params,const struct audioformat * fp)724 static int hw_check_valid_format(struct snd_usb_substream *subs,
725 struct snd_pcm_hw_params *params,
726 const struct audioformat *fp)
727 {
728 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
729 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
730 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
731 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
732 struct snd_mask check_fmts;
733 unsigned int ptime;
734
735 /* check the format */
736 snd_mask_none(&check_fmts);
737 check_fmts.bits[0] = (u32)fp->formats;
738 check_fmts.bits[1] = (u32)(fp->formats >> 32);
739 snd_mask_intersect(&check_fmts, fmts);
740 if (snd_mask_empty(&check_fmts)) {
741 hwc_debug(" > check: no supported format 0x%llx\n", fp->formats);
742 return 0;
743 }
744 /* check the channels */
745 if (fp->channels < ct->min || fp->channels > ct->max) {
746 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
747 return 0;
748 }
749 /* check the rate is within the range */
750 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
751 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
752 return 0;
753 }
754 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
755 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
756 return 0;
757 }
758 /* check whether the period time is >= the data packet interval */
759 if (subs->speed != USB_SPEED_FULL) {
760 ptime = 125 * (1 << fp->datainterval);
761 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
762 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
763 return 0;
764 }
765 }
766 return 1;
767 }
768
apply_hw_params_minmax(struct snd_interval * it,unsigned int rmin,unsigned int rmax)769 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
770 unsigned int rmax)
771 {
772 int changed;
773
774 if (rmin > rmax) {
775 hwc_debug(" --> get empty\n");
776 it->empty = 1;
777 return -EINVAL;
778 }
779
780 changed = 0;
781 if (it->min < rmin) {
782 it->min = rmin;
783 it->openmin = 0;
784 changed = 1;
785 }
786 if (it->max > rmax) {
787 it->max = rmax;
788 it->openmax = 0;
789 changed = 1;
790 }
791 if (snd_interval_checkempty(it)) {
792 it->empty = 1;
793 return -EINVAL;
794 }
795 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
796 return changed;
797 }
798
799 /* get the specified endpoint object that is being used by other streams
800 * (i.e. the parameter is locked)
801 */
802 static const struct snd_usb_endpoint *
get_endpoint_in_use(struct snd_usb_audio * chip,int endpoint,const struct snd_usb_endpoint * ref_ep)803 get_endpoint_in_use(struct snd_usb_audio *chip, int endpoint,
804 const struct snd_usb_endpoint *ref_ep)
805 {
806 const struct snd_usb_endpoint *ep;
807
808 ep = snd_usb_get_endpoint(chip, endpoint);
809 if (ep && ep->cur_audiofmt && (ep != ref_ep || ep->opened > 1))
810 return ep;
811 return NULL;
812 }
813
hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)814 static int hw_rule_rate(struct snd_pcm_hw_params *params,
815 struct snd_pcm_hw_rule *rule)
816 {
817 struct snd_usb_substream *subs = rule->private;
818 struct snd_usb_audio *chip = subs->stream->chip;
819 const struct snd_usb_endpoint *ep;
820 const struct audioformat *fp;
821 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
822 unsigned int rmin, rmax, r;
823 int i;
824
825 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
826 rmin = UINT_MAX;
827 rmax = 0;
828 list_for_each_entry(fp, &subs->fmt_list, list) {
829 if (!hw_check_valid_format(subs, params, fp))
830 continue;
831
832 ep = get_endpoint_in_use(chip, fp->endpoint,
833 subs->data_endpoint);
834 if (ep) {
835 hwc_debug("rate limit %d for ep#%x\n",
836 ep->cur_rate, fp->endpoint);
837 rmin = min(rmin, ep->cur_rate);
838 rmax = max(rmax, ep->cur_rate);
839 continue;
840 }
841
842 if (fp->implicit_fb) {
843 ep = get_endpoint_in_use(chip, fp->sync_ep,
844 subs->sync_endpoint);
845 if (ep) {
846 hwc_debug("rate limit %d for sync_ep#%x\n",
847 ep->cur_rate, fp->sync_ep);
848 rmin = min(rmin, ep->cur_rate);
849 rmax = max(rmax, ep->cur_rate);
850 continue;
851 }
852 }
853
854 r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
855 if (r > 0) {
856 if (!snd_interval_test(it, r))
857 continue;
858 rmin = min(rmin, r);
859 rmax = max(rmax, r);
860 continue;
861 }
862 if (fp->rate_table && fp->nr_rates) {
863 for (i = 0; i < fp->nr_rates; i++) {
864 r = fp->rate_table[i];
865 if (!snd_interval_test(it, r))
866 continue;
867 rmin = min(rmin, r);
868 rmax = max(rmax, r);
869 }
870 } else {
871 rmin = min(rmin, fp->rate_min);
872 rmax = max(rmax, fp->rate_max);
873 }
874 }
875
876 return apply_hw_params_minmax(it, rmin, rmax);
877 }
878
879
hw_rule_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)880 static int hw_rule_channels(struct snd_pcm_hw_params *params,
881 struct snd_pcm_hw_rule *rule)
882 {
883 struct snd_usb_substream *subs = rule->private;
884 const struct audioformat *fp;
885 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
886 unsigned int rmin, rmax;
887
888 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
889 rmin = UINT_MAX;
890 rmax = 0;
891 list_for_each_entry(fp, &subs->fmt_list, list) {
892 if (!hw_check_valid_format(subs, params, fp))
893 continue;
894 rmin = min(rmin, fp->channels);
895 rmax = max(rmax, fp->channels);
896 }
897
898 return apply_hw_params_minmax(it, rmin, rmax);
899 }
900
apply_hw_params_format_bits(struct snd_mask * fmt,u64 fbits)901 static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
902 {
903 u32 oldbits[2];
904 int changed;
905
906 oldbits[0] = fmt->bits[0];
907 oldbits[1] = fmt->bits[1];
908 fmt->bits[0] &= (u32)fbits;
909 fmt->bits[1] &= (u32)(fbits >> 32);
910 if (!fmt->bits[0] && !fmt->bits[1]) {
911 hwc_debug(" --> get empty\n");
912 return -EINVAL;
913 }
914 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
915 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
916 return changed;
917 }
918
hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)919 static int hw_rule_format(struct snd_pcm_hw_params *params,
920 struct snd_pcm_hw_rule *rule)
921 {
922 struct snd_usb_substream *subs = rule->private;
923 struct snd_usb_audio *chip = subs->stream->chip;
924 const struct snd_usb_endpoint *ep;
925 const struct audioformat *fp;
926 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
927 u64 fbits;
928
929 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
930 fbits = 0;
931 list_for_each_entry(fp, &subs->fmt_list, list) {
932 if (!hw_check_valid_format(subs, params, fp))
933 continue;
934
935 ep = get_endpoint_in_use(chip, fp->endpoint,
936 subs->data_endpoint);
937 if (ep) {
938 hwc_debug("format limit %d for ep#%x\n",
939 ep->cur_format, fp->endpoint);
940 fbits |= pcm_format_to_bits(ep->cur_format);
941 continue;
942 }
943
944 if (fp->implicit_fb) {
945 ep = get_endpoint_in_use(chip, fp->sync_ep,
946 subs->sync_endpoint);
947 if (ep) {
948 hwc_debug("format limit %d for sync_ep#%x\n",
949 ep->cur_format, fp->sync_ep);
950 fbits |= pcm_format_to_bits(ep->cur_format);
951 continue;
952 }
953 }
954
955 fbits |= fp->formats;
956 }
957 return apply_hw_params_format_bits(fmt, fbits);
958 }
959
hw_rule_period_time(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)960 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
961 struct snd_pcm_hw_rule *rule)
962 {
963 struct snd_usb_substream *subs = rule->private;
964 const struct audioformat *fp;
965 struct snd_interval *it;
966 unsigned char min_datainterval;
967 unsigned int pmin;
968
969 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
970 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
971 min_datainterval = 0xff;
972 list_for_each_entry(fp, &subs->fmt_list, list) {
973 if (!hw_check_valid_format(subs, params, fp))
974 continue;
975 min_datainterval = min(min_datainterval, fp->datainterval);
976 }
977 if (min_datainterval == 0xff) {
978 hwc_debug(" --> get empty\n");
979 it->empty = 1;
980 return -EINVAL;
981 }
982 pmin = 125 * (1 << min_datainterval);
983
984 return apply_hw_params_minmax(it, pmin, UINT_MAX);
985 }
986
987 /* additional hw constraints for implicit feedback mode */
hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)988 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
989 struct snd_pcm_hw_rule *rule)
990 {
991 struct snd_usb_substream *subs = rule->private;
992 struct snd_usb_audio *chip = subs->stream->chip;
993 const struct audioformat *fp;
994 const struct snd_usb_endpoint *ep;
995 struct snd_interval *it;
996 unsigned int rmin, rmax;
997
998 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
999 hwc_debug("hw_rule_period_size: (%u,%u)\n", it->min, it->max);
1000 rmin = UINT_MAX;
1001 rmax = 0;
1002 list_for_each_entry(fp, &subs->fmt_list, list) {
1003 if (!hw_check_valid_format(subs, params, fp))
1004 continue;
1005 ep = get_endpoint_in_use(chip, fp->endpoint,
1006 subs->data_endpoint);
1007 if (ep) {
1008 hwc_debug("period size limit %d for ep#%x\n",
1009 ep->cur_period_frames, fp->endpoint);
1010 rmin = min(rmin, ep->cur_period_frames);
1011 rmax = max(rmax, ep->cur_period_frames);
1012 continue;
1013 }
1014
1015 if (fp->implicit_fb) {
1016 ep = get_endpoint_in_use(chip, fp->sync_ep,
1017 subs->sync_endpoint);
1018 if (ep) {
1019 hwc_debug("period size limit %d for sync_ep#%x\n",
1020 ep->cur_period_frames, fp->sync_ep);
1021 rmin = min(rmin, ep->cur_period_frames);
1022 rmax = max(rmax, ep->cur_period_frames);
1023 continue;
1024 }
1025 }
1026 }
1027
1028 if (!rmax)
1029 return 0; /* no limit by implicit fb */
1030 return apply_hw_params_minmax(it, rmin, rmax);
1031 }
1032
hw_rule_periods_implicit_fb(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1033 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
1034 struct snd_pcm_hw_rule *rule)
1035 {
1036 struct snd_usb_substream *subs = rule->private;
1037 struct snd_usb_audio *chip = subs->stream->chip;
1038 const struct audioformat *fp;
1039 const struct snd_usb_endpoint *ep;
1040 struct snd_interval *it;
1041 unsigned int rmin, rmax;
1042
1043 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
1044 hwc_debug("hw_rule_periods: (%u,%u)\n", it->min, it->max);
1045 rmin = UINT_MAX;
1046 rmax = 0;
1047 list_for_each_entry(fp, &subs->fmt_list, list) {
1048 if (!hw_check_valid_format(subs, params, fp))
1049 continue;
1050 ep = get_endpoint_in_use(chip, fp->endpoint,
1051 subs->data_endpoint);
1052 if (ep) {
1053 hwc_debug("periods limit %d for ep#%x\n",
1054 ep->cur_buffer_periods, fp->endpoint);
1055 rmin = min(rmin, ep->cur_buffer_periods);
1056 rmax = max(rmax, ep->cur_buffer_periods);
1057 continue;
1058 }
1059
1060 if (fp->implicit_fb) {
1061 ep = get_endpoint_in_use(chip, fp->sync_ep,
1062 subs->sync_endpoint);
1063 if (ep) {
1064 hwc_debug("periods limit %d for sync_ep#%x\n",
1065 ep->cur_buffer_periods, fp->sync_ep);
1066 rmin = min(rmin, ep->cur_buffer_periods);
1067 rmax = max(rmax, ep->cur_buffer_periods);
1068 continue;
1069 }
1070 }
1071 }
1072
1073 if (!rmax)
1074 return 0; /* no limit by implicit fb */
1075 return apply_hw_params_minmax(it, rmin, rmax);
1076 }
1077
1078 /*
1079 * set up the runtime hardware information.
1080 */
1081
setup_hw_info(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)1082 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1083 {
1084 const struct audioformat *fp;
1085 unsigned int pt, ptmin;
1086 int param_period_time_if_needed = -1;
1087 int err;
1088
1089 runtime->hw.formats = subs->formats;
1090
1091 runtime->hw.rate_min = 0x7fffffff;
1092 runtime->hw.rate_max = 0;
1093 runtime->hw.channels_min = 256;
1094 runtime->hw.channels_max = 0;
1095 runtime->hw.rates = 0;
1096 ptmin = UINT_MAX;
1097 /* check min/max rates and channels */
1098 list_for_each_entry(fp, &subs->fmt_list, list) {
1099 runtime->hw.rates |= fp->rates;
1100 if (runtime->hw.rate_min > fp->rate_min)
1101 runtime->hw.rate_min = fp->rate_min;
1102 if (runtime->hw.rate_max < fp->rate_max)
1103 runtime->hw.rate_max = fp->rate_max;
1104 if (runtime->hw.channels_min > fp->channels)
1105 runtime->hw.channels_min = fp->channels;
1106 if (runtime->hw.channels_max < fp->channels)
1107 runtime->hw.channels_max = fp->channels;
1108 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1109 /* FIXME: there might be more than one audio formats... */
1110 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1111 fp->frame_size;
1112 }
1113 pt = 125 * (1 << fp->datainterval);
1114 ptmin = min(ptmin, pt);
1115 }
1116
1117 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1118 if (subs->speed == USB_SPEED_FULL)
1119 /* full speed devices have fixed data packet interval */
1120 ptmin = 1000;
1121 if (ptmin == 1000)
1122 /* if period time doesn't go below 1 ms, no rules needed */
1123 param_period_time_if_needed = -1;
1124
1125 err = snd_pcm_hw_constraint_minmax(runtime,
1126 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1127 ptmin, UINT_MAX);
1128 if (err < 0)
1129 return err;
1130
1131 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1132 hw_rule_rate, subs,
1133 SNDRV_PCM_HW_PARAM_RATE,
1134 SNDRV_PCM_HW_PARAM_FORMAT,
1135 SNDRV_PCM_HW_PARAM_CHANNELS,
1136 param_period_time_if_needed,
1137 -1);
1138 if (err < 0)
1139 return err;
1140
1141 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1142 hw_rule_channels, subs,
1143 SNDRV_PCM_HW_PARAM_CHANNELS,
1144 SNDRV_PCM_HW_PARAM_FORMAT,
1145 SNDRV_PCM_HW_PARAM_RATE,
1146 param_period_time_if_needed,
1147 -1);
1148 if (err < 0)
1149 return err;
1150 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1151 hw_rule_format, subs,
1152 SNDRV_PCM_HW_PARAM_FORMAT,
1153 SNDRV_PCM_HW_PARAM_RATE,
1154 SNDRV_PCM_HW_PARAM_CHANNELS,
1155 param_period_time_if_needed,
1156 -1);
1157 if (err < 0)
1158 return err;
1159 if (param_period_time_if_needed >= 0) {
1160 err = snd_pcm_hw_rule_add(runtime, 0,
1161 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1162 hw_rule_period_time, subs,
1163 SNDRV_PCM_HW_PARAM_FORMAT,
1164 SNDRV_PCM_HW_PARAM_CHANNELS,
1165 SNDRV_PCM_HW_PARAM_RATE,
1166 -1);
1167 if (err < 0)
1168 return err;
1169 }
1170
1171 /* set max period and buffer sizes for 1 and 2 seconds, respectively */
1172 err = snd_pcm_hw_constraint_minmax(runtime,
1173 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1174 0, 1000000);
1175 if (err < 0)
1176 return err;
1177 err = snd_pcm_hw_constraint_minmax(runtime,
1178 SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1179 0, 2000000);
1180 if (err < 0)
1181 return err;
1182
1183 /* additional hw constraints for implicit fb */
1184 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1185 hw_rule_period_size_implicit_fb, subs,
1186 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1187 if (err < 0)
1188 return err;
1189 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1190 hw_rule_periods_implicit_fb, subs,
1191 SNDRV_PCM_HW_PARAM_PERIODS, -1);
1192 if (err < 0)
1193 return err;
1194
1195 list_for_each_entry(fp, &subs->fmt_list, list) {
1196 if (fp->implicit_fb) {
1197 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1198 break;
1199 }
1200 }
1201
1202 return 0;
1203 }
1204
snd_usb_pcm_open(struct snd_pcm_substream * substream)1205 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1206 {
1207 int direction = substream->stream;
1208 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1209 struct snd_pcm_runtime *runtime = substream->runtime;
1210 struct snd_usb_substream *subs = &as->substream[direction];
1211 int ret;
1212
1213 runtime->hw = snd_usb_hardware;
1214 /* need an explicit sync to catch applptr update in low-latency mode */
1215 if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
1216 as->chip->lowlatency)
1217 runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR;
1218 runtime->private_data = subs;
1219 subs->pcm_substream = substream;
1220 /* runtime PM is also done there */
1221
1222 /* initialize DSD/DOP context */
1223 subs->dsd_dop.byte_idx = 0;
1224 subs->dsd_dop.channel = 0;
1225 subs->dsd_dop.marker = 1;
1226
1227 ret = setup_hw_info(runtime, subs);
1228 if (ret < 0)
1229 return ret;
1230 ret = snd_usb_autoresume(subs->stream->chip);
1231 if (ret < 0)
1232 return ret;
1233 ret = snd_media_stream_init(subs, as->pcm, direction);
1234 if (ret < 0)
1235 snd_usb_autosuspend(subs->stream->chip);
1236 return ret;
1237 }
1238
snd_usb_pcm_close(struct snd_pcm_substream * substream)1239 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1240 {
1241 int direction = substream->stream;
1242 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1243 struct snd_usb_substream *subs = &as->substream[direction];
1244 int ret;
1245
1246 snd_media_stop_pipeline(subs);
1247
1248 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
1249 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1250 snd_usb_unlock_shutdown(subs->stream->chip);
1251 if (ret < 0)
1252 return ret;
1253 }
1254
1255 subs->pcm_substream = NULL;
1256 snd_usb_autosuspend(subs->stream->chip);
1257
1258 return 0;
1259 }
1260
1261 /* Since a URB can handle only a single linear buffer, we must use double
1262 * buffering when the data to be transferred overflows the buffer boundary.
1263 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1264 * for all URBs.
1265 */
retire_capture_urb(struct snd_usb_substream * subs,struct urb * urb)1266 static void retire_capture_urb(struct snd_usb_substream *subs,
1267 struct urb *urb)
1268 {
1269 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1270 unsigned int stride, frames, bytes, oldptr;
1271 int i, period_elapsed = 0;
1272 unsigned long flags;
1273 unsigned char *cp;
1274 int current_frame_number;
1275
1276 /* read frame number here, update pointer in critical section */
1277 current_frame_number = usb_get_current_frame_number(subs->dev);
1278
1279 stride = runtime->frame_bits >> 3;
1280
1281 for (i = 0; i < urb->number_of_packets; i++) {
1282 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1283 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1284 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1285 i, urb->iso_frame_desc[i].status);
1286 // continue;
1287 }
1288 bytes = urb->iso_frame_desc[i].actual_length;
1289 if (subs->stream_offset_adj > 0) {
1290 unsigned int adj = min(subs->stream_offset_adj, bytes);
1291 cp += adj;
1292 bytes -= adj;
1293 subs->stream_offset_adj -= adj;
1294 }
1295 frames = bytes / stride;
1296 if (!subs->txfr_quirk)
1297 bytes = frames * stride;
1298 if (bytes % (runtime->sample_bits >> 3) != 0) {
1299 int oldbytes = bytes;
1300 bytes = frames * stride;
1301 dev_warn_ratelimited(&subs->dev->dev,
1302 "Corrected urb data len. %d->%d\n",
1303 oldbytes, bytes);
1304 }
1305 /* update the current pointer */
1306 spin_lock_irqsave(&subs->lock, flags);
1307 oldptr = subs->hwptr_done;
1308 subs->hwptr_done += bytes;
1309 if (subs->hwptr_done >= subs->buffer_bytes)
1310 subs->hwptr_done -= subs->buffer_bytes;
1311 frames = (bytes + (oldptr % stride)) / stride;
1312 subs->transfer_done += frames;
1313 if (subs->transfer_done >= runtime->period_size) {
1314 subs->transfer_done -= runtime->period_size;
1315 period_elapsed = 1;
1316 }
1317
1318 /* realign last_frame_number */
1319 subs->last_frame_number = current_frame_number;
1320
1321 spin_unlock_irqrestore(&subs->lock, flags);
1322 /* copy a data chunk */
1323 if (oldptr + bytes > subs->buffer_bytes) {
1324 unsigned int bytes1 = subs->buffer_bytes - oldptr;
1325
1326 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1327 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1328 } else {
1329 memcpy(runtime->dma_area + oldptr, cp, bytes);
1330 }
1331 }
1332
1333 if (period_elapsed)
1334 snd_pcm_period_elapsed(subs->pcm_substream);
1335 }
1336
urb_ctx_queue_advance(struct snd_usb_substream * subs,struct urb * urb,unsigned int bytes)1337 static void urb_ctx_queue_advance(struct snd_usb_substream *subs,
1338 struct urb *urb, unsigned int bytes)
1339 {
1340 struct snd_urb_ctx *ctx = urb->context;
1341
1342 ctx->queued += bytes;
1343 subs->inflight_bytes += bytes;
1344 subs->hwptr_done += bytes;
1345 if (subs->hwptr_done >= subs->buffer_bytes)
1346 subs->hwptr_done -= subs->buffer_bytes;
1347 }
1348
fill_playback_urb_dsd_dop(struct snd_usb_substream * subs,struct urb * urb,unsigned int bytes)1349 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1350 struct urb *urb, unsigned int bytes)
1351 {
1352 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1353 unsigned int dst_idx = 0;
1354 unsigned int src_idx = subs->hwptr_done;
1355 unsigned int wrap = subs->buffer_bytes;
1356 u8 *dst = urb->transfer_buffer;
1357 u8 *src = runtime->dma_area;
1358 static const u8 marker[] = { 0x05, 0xfa };
1359 unsigned int queued = 0;
1360
1361 /*
1362 * The DSP DOP format defines a way to transport DSD samples over
1363 * normal PCM data endpoints. It requires stuffing of marker bytes
1364 * (0x05 and 0xfa, alternating per sample frame), and then expects
1365 * 2 additional bytes of actual payload. The whole frame is stored
1366 * LSB.
1367 *
1368 * Hence, for a stereo transport, the buffer layout looks like this,
1369 * where L refers to left channel samples and R to right.
1370 *
1371 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1372 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1373 * .....
1374 *
1375 */
1376
1377 while (bytes--) {
1378 if (++subs->dsd_dop.byte_idx == 3) {
1379 /* frame boundary? */
1380 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1381 src_idx += 2;
1382 subs->dsd_dop.byte_idx = 0;
1383
1384 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1385 /* alternate the marker */
1386 subs->dsd_dop.marker++;
1387 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1388 subs->dsd_dop.channel = 0;
1389 }
1390 } else {
1391 /* stuff the DSD payload */
1392 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1393
1394 if (subs->cur_audiofmt->dsd_bitrev)
1395 dst[dst_idx++] = bitrev8(src[idx]);
1396 else
1397 dst[dst_idx++] = src[idx];
1398 queued++;
1399 }
1400 }
1401
1402 urb_ctx_queue_advance(subs, urb, queued);
1403 }
1404
1405 /* copy bit-reversed bytes onto transfer buffer */
fill_playback_urb_dsd_bitrev(struct snd_usb_substream * subs,struct urb * urb,unsigned int bytes)1406 static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
1407 struct urb *urb, unsigned int bytes)
1408 {
1409 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1410 const u8 *src = runtime->dma_area;
1411 u8 *buf = urb->transfer_buffer;
1412 int i, ofs = subs->hwptr_done;
1413
1414 for (i = 0; i < bytes; i++) {
1415 *buf++ = bitrev8(src[ofs]);
1416 if (++ofs >= subs->buffer_bytes)
1417 ofs = 0;
1418 }
1419
1420 urb_ctx_queue_advance(subs, urb, bytes);
1421 }
1422
copy_to_urb(struct snd_usb_substream * subs,struct urb * urb,int offset,int stride,unsigned int bytes)1423 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1424 int offset, int stride, unsigned int bytes)
1425 {
1426 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1427
1428 if (subs->hwptr_done + bytes > subs->buffer_bytes) {
1429 /* err, the transferred area goes over buffer boundary. */
1430 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done;
1431
1432 memcpy(urb->transfer_buffer + offset,
1433 runtime->dma_area + subs->hwptr_done, bytes1);
1434 memcpy(urb->transfer_buffer + offset + bytes1,
1435 runtime->dma_area, bytes - bytes1);
1436 } else {
1437 memcpy(urb->transfer_buffer + offset,
1438 runtime->dma_area + subs->hwptr_done, bytes);
1439 }
1440
1441 urb_ctx_queue_advance(subs, urb, bytes);
1442 }
1443
copy_to_urb_quirk(struct snd_usb_substream * subs,struct urb * urb,int stride,unsigned int bytes)1444 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1445 struct urb *urb, int stride,
1446 unsigned int bytes)
1447 {
1448 __le32 packet_length;
1449 int i;
1450
1451 /* Put __le32 length descriptor at start of each packet. */
1452 for (i = 0; i < urb->number_of_packets; i++) {
1453 unsigned int length = urb->iso_frame_desc[i].length;
1454 unsigned int offset = urb->iso_frame_desc[i].offset;
1455
1456 packet_length = cpu_to_le32(length);
1457 offset += i * sizeof(packet_length);
1458 urb->iso_frame_desc[i].offset = offset;
1459 urb->iso_frame_desc[i].length += sizeof(packet_length);
1460 memcpy(urb->transfer_buffer + offset,
1461 &packet_length, sizeof(packet_length));
1462 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1463 stride, length);
1464 }
1465 /* Adjust transfer size accordingly. */
1466 bytes += urb->number_of_packets * sizeof(packet_length);
1467 return bytes;
1468 }
1469
prepare_playback_urb(struct snd_usb_substream * subs,struct urb * urb,bool in_stream_lock)1470 static int prepare_playback_urb(struct snd_usb_substream *subs,
1471 struct urb *urb,
1472 bool in_stream_lock)
1473 {
1474 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1475 struct snd_usb_endpoint *ep = subs->data_endpoint;
1476 struct snd_urb_ctx *ctx = urb->context;
1477 unsigned int frames, bytes;
1478 int counts;
1479 unsigned int transfer_done, frame_limit, avail = 0;
1480 int i, stride, period_elapsed = 0;
1481 unsigned long flags;
1482 int err = 0;
1483
1484 stride = ep->stride;
1485
1486 frames = 0;
1487 ctx->queued = 0;
1488 urb->number_of_packets = 0;
1489
1490 spin_lock_irqsave(&subs->lock, flags);
1491 frame_limit = subs->frame_limit + ep->max_urb_frames;
1492 transfer_done = subs->transfer_done;
1493
1494 if (subs->lowlatency_playback &&
1495 runtime->state != SNDRV_PCM_STATE_DRAINING) {
1496 unsigned int hwptr = subs->hwptr_done / stride;
1497
1498 /* calculate the byte offset-in-buffer of the appl_ptr */
1499 avail = (runtime->control->appl_ptr - runtime->hw_ptr_base)
1500 % runtime->buffer_size;
1501 if (avail <= hwptr)
1502 avail += runtime->buffer_size;
1503 avail -= hwptr;
1504 }
1505
1506 for (i = 0; i < ctx->packets; i++) {
1507 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail);
1508 if (counts < 0)
1509 break;
1510 /* set up descriptor */
1511 urb->iso_frame_desc[i].offset = frames * stride;
1512 urb->iso_frame_desc[i].length = counts * stride;
1513 frames += counts;
1514 avail -= counts;
1515 urb->number_of_packets++;
1516 transfer_done += counts;
1517 if (transfer_done >= runtime->period_size) {
1518 transfer_done -= runtime->period_size;
1519 frame_limit = 0;
1520 period_elapsed = 1;
1521 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1522 if (transfer_done > 0) {
1523 /* FIXME: fill-max mode is not
1524 * supported yet */
1525 frames -= transfer_done;
1526 counts -= transfer_done;
1527 urb->iso_frame_desc[i].length =
1528 counts * stride;
1529 transfer_done = 0;
1530 }
1531 i++;
1532 if (i < ctx->packets) {
1533 /* add a transfer delimiter */
1534 urb->iso_frame_desc[i].offset =
1535 frames * stride;
1536 urb->iso_frame_desc[i].length = 0;
1537 urb->number_of_packets++;
1538 }
1539 break;
1540 }
1541 }
1542 /* finish at the period boundary or after enough frames */
1543 if ((period_elapsed || transfer_done >= frame_limit) &&
1544 !snd_usb_endpoint_implicit_feedback_sink(ep))
1545 break;
1546 }
1547
1548 if (!frames) {
1549 err = -EAGAIN;
1550 goto unlock;
1551 }
1552
1553 bytes = frames * stride;
1554 subs->transfer_done = transfer_done;
1555 subs->frame_limit = frame_limit;
1556 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1557 subs->cur_audiofmt->dsd_dop)) {
1558 fill_playback_urb_dsd_dop(subs, urb, bytes);
1559 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1560 subs->cur_audiofmt->dsd_bitrev)) {
1561 fill_playback_urb_dsd_bitrev(subs, urb, bytes);
1562 } else {
1563 /* usual PCM */
1564 if (!subs->tx_length_quirk)
1565 copy_to_urb(subs, urb, 0, stride, bytes);
1566 else
1567 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1568 /* bytes is now amount of outgoing data */
1569 }
1570
1571 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1572
1573 if (subs->trigger_tstamp_pending_update) {
1574 /* this is the first actual URB submitted,
1575 * update trigger timestamp to reflect actual start time
1576 */
1577 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1578 subs->trigger_tstamp_pending_update = false;
1579 }
1580
1581 if (period_elapsed && !subs->running && subs->lowlatency_playback) {
1582 subs->period_elapsed_pending = 1;
1583 period_elapsed = 0;
1584 }
1585
1586 unlock:
1587 spin_unlock_irqrestore(&subs->lock, flags);
1588 if (err < 0)
1589 return err;
1590 urb->transfer_buffer_length = bytes;
1591 if (period_elapsed) {
1592 if (in_stream_lock)
1593 snd_pcm_period_elapsed_under_stream_lock(subs->pcm_substream);
1594 else
1595 snd_pcm_period_elapsed(subs->pcm_substream);
1596 }
1597 return 0;
1598 }
1599
1600 /*
1601 * process after playback data complete
1602 * - decrease the delay count again
1603 */
retire_playback_urb(struct snd_usb_substream * subs,struct urb * urb)1604 static void retire_playback_urb(struct snd_usb_substream *subs,
1605 struct urb *urb)
1606 {
1607 unsigned long flags;
1608 struct snd_urb_ctx *ctx = urb->context;
1609 bool period_elapsed = false;
1610
1611 spin_lock_irqsave(&subs->lock, flags);
1612 if (ctx->queued) {
1613 if (subs->inflight_bytes >= ctx->queued)
1614 subs->inflight_bytes -= ctx->queued;
1615 else
1616 subs->inflight_bytes = 0;
1617 }
1618
1619 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1620 if (subs->running) {
1621 period_elapsed = subs->period_elapsed_pending;
1622 subs->period_elapsed_pending = 0;
1623 }
1624 spin_unlock_irqrestore(&subs->lock, flags);
1625 if (period_elapsed)
1626 snd_pcm_period_elapsed(subs->pcm_substream);
1627 }
1628
1629 /* PCM ack callback for the playback stream;
1630 * this plays a role only when the stream is running in low-latency mode.
1631 */
snd_usb_pcm_playback_ack(struct snd_pcm_substream * substream)1632 static int snd_usb_pcm_playback_ack(struct snd_pcm_substream *substream)
1633 {
1634 struct snd_usb_substream *subs = substream->runtime->private_data;
1635 struct snd_usb_endpoint *ep;
1636
1637 if (!subs->lowlatency_playback || !subs->running)
1638 return 0;
1639 ep = subs->data_endpoint;
1640 if (!ep)
1641 return 0;
1642 /* When no more in-flight URBs available, try to process the pending
1643 * outputs here
1644 */
1645 if (!ep->active_mask)
1646 return snd_usb_queue_pending_output_urbs(ep, true);
1647 return 0;
1648 }
1649
snd_usb_substream_playback_trigger(struct snd_pcm_substream * substream,int cmd)1650 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1651 int cmd)
1652 {
1653 struct snd_usb_substream *subs = substream->runtime->private_data;
1654 int err;
1655
1656 switch (cmd) {
1657 case SNDRV_PCM_TRIGGER_START:
1658 subs->trigger_tstamp_pending_update = true;
1659 fallthrough;
1660 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1661 snd_usb_endpoint_set_callback(subs->data_endpoint,
1662 prepare_playback_urb,
1663 retire_playback_urb,
1664 subs);
1665 if (subs->lowlatency_playback &&
1666 cmd == SNDRV_PCM_TRIGGER_START) {
1667 if (in_free_wheeling_mode(substream->runtime))
1668 subs->lowlatency_playback = false;
1669 err = start_endpoints(subs);
1670 if (err < 0) {
1671 snd_usb_endpoint_set_callback(subs->data_endpoint,
1672 NULL, NULL, NULL);
1673 return err;
1674 }
1675 }
1676 subs->running = 1;
1677 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
1678 subs->cur_audiofmt->iface,
1679 subs->cur_audiofmt->altsetting);
1680 return 0;
1681 case SNDRV_PCM_TRIGGER_SUSPEND:
1682 case SNDRV_PCM_TRIGGER_STOP:
1683 stop_endpoints(subs, substream->runtime->state == SNDRV_PCM_STATE_DRAINING);
1684 snd_usb_endpoint_set_callback(subs->data_endpoint,
1685 NULL, NULL, NULL);
1686 subs->running = 0;
1687 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
1688 subs->cur_audiofmt->iface,
1689 subs->cur_audiofmt->altsetting);
1690 return 0;
1691 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1692 /* keep retire_data_urb for delay calculation */
1693 snd_usb_endpoint_set_callback(subs->data_endpoint,
1694 NULL,
1695 retire_playback_urb,
1696 subs);
1697 subs->running = 0;
1698 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
1699 subs->cur_audiofmt->iface,
1700 subs->cur_audiofmt->altsetting);
1701 return 0;
1702 }
1703
1704 return -EINVAL;
1705 }
1706
snd_usb_substream_capture_trigger(struct snd_pcm_substream * substream,int cmd)1707 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1708 int cmd)
1709 {
1710 int err;
1711 struct snd_usb_substream *subs = substream->runtime->private_data;
1712
1713 switch (cmd) {
1714 case SNDRV_PCM_TRIGGER_START:
1715 err = start_endpoints(subs);
1716 if (err < 0)
1717 return err;
1718 fallthrough;
1719 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1720 snd_usb_endpoint_set_callback(subs->data_endpoint,
1721 NULL, retire_capture_urb,
1722 subs);
1723 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1724 subs->running = 1;
1725 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
1726 subs->cur_audiofmt->iface,
1727 subs->cur_audiofmt->altsetting);
1728 return 0;
1729 case SNDRV_PCM_TRIGGER_SUSPEND:
1730 case SNDRV_PCM_TRIGGER_STOP:
1731 stop_endpoints(subs, false);
1732 fallthrough;
1733 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1734 snd_usb_endpoint_set_callback(subs->data_endpoint,
1735 NULL, NULL, NULL);
1736 subs->running = 0;
1737 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
1738 subs->cur_audiofmt->iface,
1739 subs->cur_audiofmt->altsetting);
1740 return 0;
1741 }
1742
1743 return -EINVAL;
1744 }
1745
1746 static const struct snd_pcm_ops snd_usb_playback_ops = {
1747 .open = snd_usb_pcm_open,
1748 .close = snd_usb_pcm_close,
1749 .hw_params = snd_usb_hw_params,
1750 .hw_free = snd_usb_hw_free,
1751 .prepare = snd_usb_pcm_prepare,
1752 .trigger = snd_usb_substream_playback_trigger,
1753 .sync_stop = snd_usb_pcm_sync_stop,
1754 .pointer = snd_usb_pcm_pointer,
1755 .ack = snd_usb_pcm_playback_ack,
1756 };
1757
1758 static const struct snd_pcm_ops snd_usb_capture_ops = {
1759 .open = snd_usb_pcm_open,
1760 .close = snd_usb_pcm_close,
1761 .hw_params = snd_usb_hw_params,
1762 .hw_free = snd_usb_hw_free,
1763 .prepare = snd_usb_pcm_prepare,
1764 .trigger = snd_usb_substream_capture_trigger,
1765 .sync_stop = snd_usb_pcm_sync_stop,
1766 .pointer = snd_usb_pcm_pointer,
1767 };
1768
snd_usb_set_pcm_ops(struct snd_pcm * pcm,int stream)1769 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1770 {
1771 const struct snd_pcm_ops *ops;
1772
1773 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1774 &snd_usb_playback_ops : &snd_usb_capture_ops;
1775 snd_pcm_set_ops(pcm, stream, ops);
1776 }
1777
snd_usb_preallocate_buffer(struct snd_usb_substream * subs)1778 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1779 {
1780 struct snd_pcm *pcm = subs->stream->pcm;
1781 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1782 struct device *dev = subs->dev->bus->sysdev;
1783
1784 if (snd_usb_use_vmalloc)
1785 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1786 NULL, 0, 0);
1787 else
1788 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1789 dev, 64*1024, 512*1024);
1790 }
1791