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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/bitrev.h>
20#include <linux/ratelimit.h>
21#include <linux/usb.h>
22#include <linux/usb/audio.h>
23#include <linux/usb/audio-v2.h>
24
25#include <sound/core.h>
26#include <sound/pcm.h>
27#include <sound/pcm_params.h>
28
29#include "usbaudio.h"
30#include "card.h"
31#include "quirks.h"
32#include "debug.h"
33#include "endpoint.h"
34#include "helper.h"
35#include "pcm.h"
36#include "clock.h"
37#include "power.h"
38
39#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
40#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
41
42/* return the estimated delay based on USB frame counters */
43snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
44 unsigned int rate)
45{
46 int current_frame_number;
47 int frame_diff;
48 int est_delay;
49
50 if (!subs->last_delay)
51 return 0; /* short path */
52
53 current_frame_number = usb_get_current_frame_number(subs->dev);
54 /*
55 * HCD implementations use different widths, use lower 8 bits.
56 * The delay will be managed up to 256ms, which is more than
57 * enough
58 */
59 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
60
61 /* Approximation based on number of samples per USB frame (ms),
62 some truncation for 44.1 but the estimate is good enough */
63 est_delay = frame_diff * rate / 1000;
64 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
65 est_delay = subs->last_delay - est_delay;
66 else
67 est_delay = subs->last_delay + est_delay;
68
69 if (est_delay < 0)
70 est_delay = 0;
71 return est_delay;
72}
73
74/*
75 * return the current pcm pointer. just based on the hwptr_done value.
76 */
77static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
78{
79 struct snd_usb_substream *subs;
80 unsigned int hwptr_done;
81
82 subs = (struct snd_usb_substream *)substream->runtime->private_data;
83 if (subs->stream->chip->shutdown)
84 return SNDRV_PCM_POS_XRUN;
85 spin_lock(&subs->lock);
86 hwptr_done = subs->hwptr_done;
87 substream->runtime->delay = snd_usb_pcm_delay(subs,
88 substream->runtime->rate);
89 spin_unlock(&subs->lock);
90 return hwptr_done / (substream->runtime->frame_bits >> 3);
91}
92
93/*
94 * find a matching audio format
95 */
96static struct audioformat *find_format(struct snd_usb_substream *subs)
97{
98 struct audioformat *fp;
99 struct audioformat *found = NULL;
100 int cur_attr = 0, attr;
101
102 list_for_each_entry(fp, &subs->fmt_list, list) {
103 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
104 continue;
105 if (fp->channels != subs->channels)
106 continue;
107 if (subs->cur_rate < fp->rate_min ||
108 subs->cur_rate > fp->rate_max)
109 continue;
110 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
111 unsigned int i;
112 for (i = 0; i < fp->nr_rates; i++)
113 if (fp->rate_table[i] == subs->cur_rate)
114 break;
115 if (i >= fp->nr_rates)
116 continue;
117 }
118 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
119 if (! found) {
120 found = fp;
121 cur_attr = attr;
122 continue;
123 }
124 /* avoid async out and adaptive in if the other method
125 * supports the same format.
126 * this is a workaround for the case like
127 * M-audio audiophile USB.
128 */
129 if (attr != cur_attr) {
130 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
131 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
132 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
133 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
134 continue;
135 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
136 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
137 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
138 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
139 found = fp;
140 cur_attr = attr;
141 continue;
142 }
143 }
144 /* find the format with the largest max. packet size */
145 if (fp->maxpacksize > found->maxpacksize) {
146 found = fp;
147 cur_attr = attr;
148 }
149 }
150 return found;
151}
152
153static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
154 struct usb_host_interface *alts,
155 struct audioformat *fmt)
156{
157 struct usb_device *dev = chip->dev;
158 unsigned int ep;
159 unsigned char data[1];
160 int err;
161
162 ep = get_endpoint(alts, 0)->bEndpointAddress;
163
164 data[0] = 1;
165 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
166 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
167 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
168 data, sizeof(data))) < 0) {
169 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
170 iface, ep);
171 return err;
172 }
173
174 return 0;
175}
176
177static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
178 struct usb_host_interface *alts,
179 struct audioformat *fmt)
180{
181 struct usb_device *dev = chip->dev;
182 unsigned char data[1];
183 int err;
184
185 data[0] = 1;
186 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
187 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
188 UAC2_EP_CS_PITCH << 8, 0,
189 data, sizeof(data))) < 0) {
190 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
191 iface, fmt->altsetting);
192 return err;
193 }
194
195 return 0;
196}
197
198/*
199 * initialize the pitch control and sample rate
200 */
201int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
202 struct usb_host_interface *alts,
203 struct audioformat *fmt)
204{
205 /* if endpoint doesn't have pitch control, bail out */
206 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
207 return 0;
208
209 switch (fmt->protocol) {
210 case UAC_VERSION_1:
211 default:
212 return init_pitch_v1(chip, iface, alts, fmt);
213
214 case UAC_VERSION_2:
215 return init_pitch_v2(chip, iface, alts, fmt);
216 }
217}
218
219static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
220{
221 int err;
222
223 if (!subs->data_endpoint)
224 return -EINVAL;
225
226 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
227 struct snd_usb_endpoint *ep = subs->data_endpoint;
228
229 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
230
231 ep->data_subs = subs;
232 err = snd_usb_endpoint_start(ep, can_sleep);
233 if (err < 0) {
234 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
235 return err;
236 }
237 }
238
239 if (subs->sync_endpoint &&
240 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
241 struct snd_usb_endpoint *ep = subs->sync_endpoint;
242
243 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
244 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
245 err = usb_set_interface(subs->dev,
246 subs->sync_endpoint->iface,
247 subs->sync_endpoint->altsetting);
248 if (err < 0) {
249 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
250 dev_err(&subs->dev->dev,
251 "%d:%d: cannot set interface (%d)\n",
252 subs->sync_endpoint->iface,
253 subs->sync_endpoint->altsetting, err);
254 return -EIO;
255 }
256 }
257
258 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
259
260 ep->sync_slave = subs->data_endpoint;
261 err = snd_usb_endpoint_start(ep, can_sleep);
262 if (err < 0) {
263 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
264 return err;
265 }
266 }
267
268 return 0;
269}
270
271static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
272{
273 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
274 snd_usb_endpoint_stop(subs->sync_endpoint);
275
276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
277 snd_usb_endpoint_stop(subs->data_endpoint);
278
279 if (wait) {
280 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
281 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
282 }
283}
284
285static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
286 unsigned int altsetting,
287 struct usb_host_interface **alts,
288 unsigned int *ep)
289{
290 struct usb_interface *iface;
291 struct usb_interface_descriptor *altsd;
292 struct usb_endpoint_descriptor *epd;
293
294 iface = usb_ifnum_to_if(dev, ifnum);
295 if (!iface || iface->num_altsetting < altsetting + 1)
296 return -ENOENT;
297 *alts = &iface->altsetting[altsetting];
298 altsd = get_iface_desc(*alts);
299 if (altsd->bAlternateSetting != altsetting ||
300 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
301 (altsd->bInterfaceSubClass != 2 &&
302 altsd->bInterfaceProtocol != 2 ) ||
303 altsd->bNumEndpoints < 1)
304 return -ENOENT;
305 epd = get_endpoint(*alts, 0);
306 if (!usb_endpoint_is_isoc_in(epd) ||
307 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
308 USB_ENDPOINT_USAGE_IMPLICIT_FB)
309 return -ENOENT;
310 *ep = epd->bEndpointAddress;
311 return 0;
312}
313
314static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
315 struct usb_device *dev,
316 struct usb_interface_descriptor *altsd,
317 unsigned int attr)
318{
319 struct usb_host_interface *alts;
320 struct usb_interface *iface;
321 unsigned int ep;
322
323 /* Implicit feedback sync EPs consumers are always playback EPs */
324 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
325 return 0;
326
327 switch (subs->stream->chip->usb_id) {
328 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
329 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
330 ep = 0x81;
331 iface = usb_ifnum_to_if(dev, 3);
332
333 if (!iface || iface->num_altsetting == 0)
334 return -EINVAL;
335
336 alts = &iface->altsetting[1];
337 goto add_sync_ep;
338 break;
339 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
340 case USB_ID(0x0763, 0x2081):
341 ep = 0x81;
342 iface = usb_ifnum_to_if(dev, 2);
343
344 if (!iface || iface->num_altsetting == 0)
345 return -EINVAL;
346
347 alts = &iface->altsetting[1];
348 goto add_sync_ep;
349 }
350 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
351 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
352 altsd->bInterfaceProtocol == 2 &&
353 altsd->bNumEndpoints == 1 &&
354 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
355 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
356 altsd->bAlternateSetting,
357 &alts, &ep) >= 0) {
358 goto add_sync_ep;
359 }
360
361 /* No quirk */
362 return 0;
363
364add_sync_ep:
365 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
366 alts, ep, !subs->direction,
367 SND_USB_ENDPOINT_TYPE_DATA);
368 if (!subs->sync_endpoint)
369 return -EINVAL;
370
371 subs->data_endpoint->sync_master = subs->sync_endpoint;
372
373 return 0;
374}
375
376static int set_sync_endpoint(struct snd_usb_substream *subs,
377 struct audioformat *fmt,
378 struct usb_device *dev,
379 struct usb_host_interface *alts,
380 struct usb_interface_descriptor *altsd)
381{
382 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
383 unsigned int ep, attr;
384 bool implicit_fb;
385 int err;
386
387 /* we need a sync pipe in async OUT or adaptive IN mode */
388 /* check the number of EP, since some devices have broken
389 * descriptors which fool us. if it has only one EP,
390 * assume it as adaptive-out or sync-in.
391 */
392 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
393
394 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
395 if (err < 0)
396 return err;
397
398 if (altsd->bNumEndpoints < 2)
399 return 0;
400
401 if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) ||
402 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
403 return 0;
404
405 /* check sync-pipe endpoint */
406 /* ... and check descriptor size before accessing bSynchAddress
407 because there is a version of the SB Audigy 2 NX firmware lacking
408 the audio fields in the endpoint descriptors */
409 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
410 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
411 get_endpoint(alts, 1)->bSynchAddress != 0)) {
412 dev_err(&dev->dev,
413 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
414 fmt->iface, fmt->altsetting,
415 get_endpoint(alts, 1)->bmAttributes,
416 get_endpoint(alts, 1)->bLength,
417 get_endpoint(alts, 1)->bSynchAddress);
418 return -EINVAL;
419 }
420 ep = get_endpoint(alts, 1)->bEndpointAddress;
421 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
422 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
423 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
424 dev_err(&dev->dev,
425 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
426 fmt->iface, fmt->altsetting,
427 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
428 return -EINVAL;
429 }
430
431 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
432 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
433
434 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
435 alts, ep, !subs->direction,
436 implicit_fb ?
437 SND_USB_ENDPOINT_TYPE_DATA :
438 SND_USB_ENDPOINT_TYPE_SYNC);
439 if (!subs->sync_endpoint)
440 return -EINVAL;
441
442 subs->data_endpoint->sync_master = subs->sync_endpoint;
443
444 return 0;
445}
446
447/*
448 * find a matching format and set up the interface
449 */
450static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
451{
452 struct usb_device *dev = subs->dev;
453 struct usb_host_interface *alts;
454 struct usb_interface_descriptor *altsd;
455 struct usb_interface *iface;
456 int err;
457
458 iface = usb_ifnum_to_if(dev, fmt->iface);
459 if (WARN_ON(!iface))
460 return -EINVAL;
461 alts = &iface->altsetting[fmt->altset_idx];
462 altsd = get_iface_desc(alts);
463 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
464 return -EINVAL;
465
466 if (fmt == subs->cur_audiofmt)
467 return 0;
468
469 /* close the old interface */
470 if (subs->interface >= 0 && subs->interface != fmt->iface) {
471 err = usb_set_interface(subs->dev, subs->interface, 0);
472 if (err < 0) {
473 dev_err(&dev->dev,
474 "%d:%d: return to setting 0 failed (%d)\n",
475 fmt->iface, fmt->altsetting, err);
476 return -EIO;
477 }
478 subs->interface = -1;
479 subs->altset_idx = 0;
480 }
481
482 /* set interface */
483 if (subs->interface != fmt->iface ||
484 subs->altset_idx != fmt->altset_idx) {
485 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
486 if (err < 0) {
487 dev_err(&dev->dev,
488 "%d:%d: usb_set_interface failed (%d)\n",
489 fmt->iface, fmt->altsetting, err);
490 return -EIO;
491 }
492 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
493 fmt->iface, fmt->altsetting);
494 subs->interface = fmt->iface;
495 subs->altset_idx = fmt->altset_idx;
496
497 snd_usb_set_interface_quirk(dev);
498 }
499
500 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
501 alts, fmt->endpoint, subs->direction,
502 SND_USB_ENDPOINT_TYPE_DATA);
503
504 if (!subs->data_endpoint)
505 return -EINVAL;
506
507 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
508 if (err < 0)
509 return err;
510
511 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
512 if (err < 0)
513 return err;
514
515 subs->cur_audiofmt = fmt;
516
517 snd_usb_set_format_quirk(subs, fmt);
518
519 return 0;
520}
521
522/*
523 * Return the score of matching two audioformats.
524 * Veto the audioformat if:
525 * - It has no channels for some reason.
526 * - Requested PCM format is not supported.
527 * - Requested sample rate is not supported.
528 */
529static int match_endpoint_audioformats(struct snd_usb_substream *subs,
530 struct audioformat *fp,
531 struct audioformat *match, int rate,
532 snd_pcm_format_t pcm_format)
533{
534 int i;
535 int score = 0;
536
537 if (fp->channels < 1) {
538 dev_dbg(&subs->dev->dev,
539 "%s: (fmt @%p) no channels\n", __func__, fp);
540 return 0;
541 }
542
543 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
544 dev_dbg(&subs->dev->dev,
545 "%s: (fmt @%p) no match for format %d\n", __func__,
546 fp, pcm_format);
547 return 0;
548 }
549
550 for (i = 0; i < fp->nr_rates; i++) {
551 if (fp->rate_table[i] == rate) {
552 score++;
553 break;
554 }
555 }
556 if (!score) {
557 dev_dbg(&subs->dev->dev,
558 "%s: (fmt @%p) no match for rate %d\n", __func__,
559 fp, rate);
560 return 0;
561 }
562
563 if (fp->channels == match->channels)
564 score++;
565
566 dev_dbg(&subs->dev->dev,
567 "%s: (fmt @%p) score %d\n", __func__, fp, score);
568
569 return score;
570}
571
572/*
573 * Configure the sync ep using the rate and pcm format of the data ep.
574 */
575static int configure_sync_endpoint(struct snd_usb_substream *subs)
576{
577 int ret;
578 struct audioformat *fp;
579 struct audioformat *sync_fp = NULL;
580 int cur_score = 0;
581 int sync_period_bytes = subs->period_bytes;
582 struct snd_usb_substream *sync_subs =
583 &subs->stream->substream[subs->direction ^ 1];
584
585 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
586 !subs->stream)
587 return snd_usb_endpoint_set_params(subs->sync_endpoint,
588 subs->pcm_format,
589 subs->channels,
590 subs->period_bytes,
591 0, 0,
592 subs->cur_rate,
593 subs->cur_audiofmt,
594 NULL);
595
596 /* Try to find the best matching audioformat. */
597 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
598 int score = match_endpoint_audioformats(subs,
599 fp, subs->cur_audiofmt,
600 subs->cur_rate, subs->pcm_format);
601
602 if (score > cur_score) {
603 sync_fp = fp;
604 cur_score = score;
605 }
606 }
607
608 if (unlikely(sync_fp == NULL)) {
609 dev_err(&subs->dev->dev,
610 "%s: no valid audioformat for sync ep %x found\n",
611 __func__, sync_subs->ep_num);
612 return -EINVAL;
613 }
614
615 /*
616 * Recalculate the period bytes if channel number differ between
617 * data and sync ep audioformat.
618 */
619 if (sync_fp->channels != subs->channels) {
620 sync_period_bytes = (subs->period_bytes / subs->channels) *
621 sync_fp->channels;
622 dev_dbg(&subs->dev->dev,
623 "%s: adjusted sync ep period bytes (%d -> %d)\n",
624 __func__, subs->period_bytes, sync_period_bytes);
625 }
626
627 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
628 subs->pcm_format,
629 sync_fp->channels,
630 sync_period_bytes,
631 0, 0,
632 subs->cur_rate,
633 sync_fp,
634 NULL);
635
636 return ret;
637}
638
639/*
640 * configure endpoint params
641 *
642 * called during initial setup and upon resume
643 */
644static int configure_endpoint(struct snd_usb_substream *subs)
645{
646 int ret;
647
648 /* format changed */
649 stop_endpoints(subs, true);
650 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
651 subs->pcm_format,
652 subs->channels,
653 subs->period_bytes,
654 subs->period_frames,
655 subs->buffer_periods,
656 subs->cur_rate,
657 subs->cur_audiofmt,
658 subs->sync_endpoint);
659 if (ret < 0)
660 return ret;
661
662 if (subs->sync_endpoint)
663 ret = configure_sync_endpoint(subs);
664
665 return ret;
666}
667
668/*
669 * hw_params callback
670 *
671 * allocate a buffer and set the given audio format.
672 *
673 * so far we use a physically linear buffer although packetize transfer
674 * doesn't need a continuous area.
675 * if sg buffer is supported on the later version of alsa, we'll follow
676 * that.
677 */
678static int snd_usb_hw_params(struct snd_pcm_substream *substream,
679 struct snd_pcm_hw_params *hw_params)
680{
681 struct snd_usb_substream *subs = substream->runtime->private_data;
682 struct audioformat *fmt;
683 int ret;
684
685 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
686 params_buffer_bytes(hw_params));
687 if (ret < 0)
688 return ret;
689
690 subs->pcm_format = params_format(hw_params);
691 subs->period_bytes = params_period_bytes(hw_params);
692 subs->period_frames = params_period_size(hw_params);
693 subs->buffer_periods = params_periods(hw_params);
694 subs->channels = params_channels(hw_params);
695 subs->cur_rate = params_rate(hw_params);
696
697 fmt = find_format(subs);
698 if (!fmt) {
699 dev_dbg(&subs->dev->dev,
700 "cannot set format: format = %#x, rate = %d, channels = %d\n",
701 subs->pcm_format, subs->cur_rate, subs->channels);
702 return -EINVAL;
703 }
704
705 down_read(&subs->stream->chip->shutdown_rwsem);
706 if (subs->stream->chip->shutdown)
707 ret = -ENODEV;
708 else
709 ret = set_format(subs, fmt);
710 up_read(&subs->stream->chip->shutdown_rwsem);
711 if (ret < 0)
712 return ret;
713
714 subs->interface = fmt->iface;
715 subs->altset_idx = fmt->altset_idx;
716 subs->need_setup_ep = true;
717
718 return 0;
719}
720
721/*
722 * hw_free callback
723 *
724 * reset the audio format and release the buffer
725 */
726static int snd_usb_hw_free(struct snd_pcm_substream *substream)
727{
728 struct snd_usb_substream *subs = substream->runtime->private_data;
729
730 subs->cur_audiofmt = NULL;
731 subs->cur_rate = 0;
732 subs->period_bytes = 0;
733 down_read(&subs->stream->chip->shutdown_rwsem);
734 if (!subs->stream->chip->shutdown) {
735 stop_endpoints(subs, true);
736 snd_usb_endpoint_deactivate(subs->sync_endpoint);
737 snd_usb_endpoint_deactivate(subs->data_endpoint);
738 }
739 up_read(&subs->stream->chip->shutdown_rwsem);
740 return snd_pcm_lib_free_vmalloc_buffer(substream);
741}
742
743/*
744 * prepare callback
745 *
746 * only a few subtle things...
747 */
748static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
749{
750 struct snd_pcm_runtime *runtime = substream->runtime;
751 struct snd_usb_substream *subs = runtime->private_data;
752 struct usb_host_interface *alts;
753 struct usb_interface *iface;
754 int ret;
755
756 if (! subs->cur_audiofmt) {
757 dev_err(&subs->dev->dev, "no format is specified!\n");
758 return -ENXIO;
759 }
760
761 down_read(&subs->stream->chip->shutdown_rwsem);
762 if (subs->stream->chip->shutdown) {
763 ret = -ENODEV;
764 goto unlock;
765 }
766 if (snd_BUG_ON(!subs->data_endpoint)) {
767 ret = -EIO;
768 goto unlock;
769 }
770
771 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
772 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
773
774 ret = set_format(subs, subs->cur_audiofmt);
775 if (ret < 0)
776 goto unlock;
777
778 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
779 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
780 ret = snd_usb_init_sample_rate(subs->stream->chip,
781 subs->cur_audiofmt->iface,
782 alts,
783 subs->cur_audiofmt,
784 subs->cur_rate);
785 if (ret < 0)
786 goto unlock;
787
788 if (subs->need_setup_ep) {
789 ret = configure_endpoint(subs);
790 if (ret < 0)
791 goto unlock;
792 subs->need_setup_ep = false;
793 }
794
795 /* some unit conversions in runtime */
796 subs->data_endpoint->maxframesize =
797 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
798 subs->data_endpoint->curframesize =
799 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
800
801 /* reset the pointer */
802 subs->hwptr_done = 0;
803 subs->transfer_done = 0;
804 subs->last_delay = 0;
805 subs->last_frame_number = 0;
806 runtime->delay = 0;
807
808 /* for playback, submit the URBs now; otherwise, the first hwptr_done
809 * updates for all URBs would happen at the same time when starting */
810 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
811 ret = start_endpoints(subs, true);
812
813 unlock:
814 up_read(&subs->stream->chip->shutdown_rwsem);
815 return ret;
816}
817
818static struct snd_pcm_hardware snd_usb_hardware =
819{
820 .info = SNDRV_PCM_INFO_MMAP |
821 SNDRV_PCM_INFO_MMAP_VALID |
822 SNDRV_PCM_INFO_BATCH |
823 SNDRV_PCM_INFO_INTERLEAVED |
824 SNDRV_PCM_INFO_BLOCK_TRANSFER |
825 SNDRV_PCM_INFO_PAUSE,
826 .buffer_bytes_max = 1024 * 1024,
827 .period_bytes_min = 64,
828 .period_bytes_max = 512 * 1024,
829 .periods_min = 2,
830 .periods_max = 1024,
831};
832
833static int hw_check_valid_format(struct snd_usb_substream *subs,
834 struct snd_pcm_hw_params *params,
835 struct audioformat *fp)
836{
837 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
838 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
839 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
840 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
841 struct snd_mask check_fmts;
842 unsigned int ptime;
843
844 /* check the format */
845 snd_mask_none(&check_fmts);
846 check_fmts.bits[0] = (u32)fp->formats;
847 check_fmts.bits[1] = (u32)(fp->formats >> 32);
848 snd_mask_intersect(&check_fmts, fmts);
849 if (snd_mask_empty(&check_fmts)) {
850 hwc_debug(" > check: no supported format %d\n", fp->format);
851 return 0;
852 }
853 /* check the channels */
854 if (fp->channels < ct->min || fp->channels > ct->max) {
855 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
856 return 0;
857 }
858 /* check the rate is within the range */
859 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
860 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
861 return 0;
862 }
863 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
864 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
865 return 0;
866 }
867 /* check whether the period time is >= the data packet interval */
868 if (subs->speed != USB_SPEED_FULL) {
869 ptime = 125 * (1 << fp->datainterval);
870 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
871 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
872 return 0;
873 }
874 }
875 return 1;
876}
877
878static int hw_rule_rate(struct snd_pcm_hw_params *params,
879 struct snd_pcm_hw_rule *rule)
880{
881 struct snd_usb_substream *subs = rule->private;
882 struct audioformat *fp;
883 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
884 unsigned int rmin, rmax;
885 int changed;
886
887 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
888 changed = 0;
889 rmin = rmax = 0;
890 list_for_each_entry(fp, &subs->fmt_list, list) {
891 if (!hw_check_valid_format(subs, params, fp))
892 continue;
893 if (changed++) {
894 if (rmin > fp->rate_min)
895 rmin = fp->rate_min;
896 if (rmax < fp->rate_max)
897 rmax = fp->rate_max;
898 } else {
899 rmin = fp->rate_min;
900 rmax = fp->rate_max;
901 }
902 }
903
904 if (!changed) {
905 hwc_debug(" --> get empty\n");
906 it->empty = 1;
907 return -EINVAL;
908 }
909
910 changed = 0;
911 if (it->min < rmin) {
912 it->min = rmin;
913 it->openmin = 0;
914 changed = 1;
915 }
916 if (it->max > rmax) {
917 it->max = rmax;
918 it->openmax = 0;
919 changed = 1;
920 }
921 if (snd_interval_checkempty(it)) {
922 it->empty = 1;
923 return -EINVAL;
924 }
925 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
926 return changed;
927}
928
929
930static int hw_rule_channels(struct snd_pcm_hw_params *params,
931 struct snd_pcm_hw_rule *rule)
932{
933 struct snd_usb_substream *subs = rule->private;
934 struct audioformat *fp;
935 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
936 unsigned int rmin, rmax;
937 int changed;
938
939 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
940 changed = 0;
941 rmin = rmax = 0;
942 list_for_each_entry(fp, &subs->fmt_list, list) {
943 if (!hw_check_valid_format(subs, params, fp))
944 continue;
945 if (changed++) {
946 if (rmin > fp->channels)
947 rmin = fp->channels;
948 if (rmax < fp->channels)
949 rmax = fp->channels;
950 } else {
951 rmin = fp->channels;
952 rmax = fp->channels;
953 }
954 }
955
956 if (!changed) {
957 hwc_debug(" --> get empty\n");
958 it->empty = 1;
959 return -EINVAL;
960 }
961
962 changed = 0;
963 if (it->min < rmin) {
964 it->min = rmin;
965 it->openmin = 0;
966 changed = 1;
967 }
968 if (it->max > rmax) {
969 it->max = rmax;
970 it->openmax = 0;
971 changed = 1;
972 }
973 if (snd_interval_checkempty(it)) {
974 it->empty = 1;
975 return -EINVAL;
976 }
977 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
978 return changed;
979}
980
981static int hw_rule_format(struct snd_pcm_hw_params *params,
982 struct snd_pcm_hw_rule *rule)
983{
984 struct snd_usb_substream *subs = rule->private;
985 struct audioformat *fp;
986 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
987 u64 fbits;
988 u32 oldbits[2];
989 int changed;
990
991 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
992 fbits = 0;
993 list_for_each_entry(fp, &subs->fmt_list, list) {
994 if (!hw_check_valid_format(subs, params, fp))
995 continue;
996 fbits |= fp->formats;
997 }
998
999 oldbits[0] = fmt->bits[0];
1000 oldbits[1] = fmt->bits[1];
1001 fmt->bits[0] &= (u32)fbits;
1002 fmt->bits[1] &= (u32)(fbits >> 32);
1003 if (!fmt->bits[0] && !fmt->bits[1]) {
1004 hwc_debug(" --> get empty\n");
1005 return -EINVAL;
1006 }
1007 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1008 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1009 return changed;
1010}
1011
1012static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1013 struct snd_pcm_hw_rule *rule)
1014{
1015 struct snd_usb_substream *subs = rule->private;
1016 struct audioformat *fp;
1017 struct snd_interval *it;
1018 unsigned char min_datainterval;
1019 unsigned int pmin;
1020 int changed;
1021
1022 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1023 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1024 min_datainterval = 0xff;
1025 list_for_each_entry(fp, &subs->fmt_list, list) {
1026 if (!hw_check_valid_format(subs, params, fp))
1027 continue;
1028 min_datainterval = min(min_datainterval, fp->datainterval);
1029 }
1030 if (min_datainterval == 0xff) {
1031 hwc_debug(" --> get empty\n");
1032 it->empty = 1;
1033 return -EINVAL;
1034 }
1035 pmin = 125 * (1 << min_datainterval);
1036 changed = 0;
1037 if (it->min < pmin) {
1038 it->min = pmin;
1039 it->openmin = 0;
1040 changed = 1;
1041 }
1042 if (snd_interval_checkempty(it)) {
1043 it->empty = 1;
1044 return -EINVAL;
1045 }
1046 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1047 return changed;
1048}
1049
1050/*
1051 * If the device supports unusual bit rates, does the request meet these?
1052 */
1053static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1054 struct snd_usb_substream *subs)
1055{
1056 struct audioformat *fp;
1057 int *rate_list;
1058 int count = 0, needs_knot = 0;
1059 int err;
1060
1061 kfree(subs->rate_list.list);
1062 subs->rate_list.list = NULL;
1063
1064 list_for_each_entry(fp, &subs->fmt_list, list) {
1065 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1066 return 0;
1067 count += fp->nr_rates;
1068 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1069 needs_knot = 1;
1070 }
1071 if (!needs_knot)
1072 return 0;
1073
1074 subs->rate_list.list = rate_list =
1075 kmalloc(sizeof(int) * count, GFP_KERNEL);
1076 if (!subs->rate_list.list)
1077 return -ENOMEM;
1078 subs->rate_list.count = count;
1079 subs->rate_list.mask = 0;
1080 count = 0;
1081 list_for_each_entry(fp, &subs->fmt_list, list) {
1082 int i;
1083 for (i = 0; i < fp->nr_rates; i++)
1084 rate_list[count++] = fp->rate_table[i];
1085 }
1086 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1087 &subs->rate_list);
1088 if (err < 0)
1089 return err;
1090
1091 return 0;
1092}
1093
1094
1095/*
1096 * set up the runtime hardware information.
1097 */
1098
1099static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1100{
1101 struct audioformat *fp;
1102 unsigned int pt, ptmin;
1103 int param_period_time_if_needed;
1104 int err;
1105
1106 runtime->hw.formats = subs->formats;
1107
1108 runtime->hw.rate_min = 0x7fffffff;
1109 runtime->hw.rate_max = 0;
1110 runtime->hw.channels_min = 256;
1111 runtime->hw.channels_max = 0;
1112 runtime->hw.rates = 0;
1113 ptmin = UINT_MAX;
1114 /* check min/max rates and channels */
1115 list_for_each_entry(fp, &subs->fmt_list, list) {
1116 runtime->hw.rates |= fp->rates;
1117 if (runtime->hw.rate_min > fp->rate_min)
1118 runtime->hw.rate_min = fp->rate_min;
1119 if (runtime->hw.rate_max < fp->rate_max)
1120 runtime->hw.rate_max = fp->rate_max;
1121 if (runtime->hw.channels_min > fp->channels)
1122 runtime->hw.channels_min = fp->channels;
1123 if (runtime->hw.channels_max < fp->channels)
1124 runtime->hw.channels_max = fp->channels;
1125 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1126 /* FIXME: there might be more than one audio formats... */
1127 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1128 fp->frame_size;
1129 }
1130 pt = 125 * (1 << fp->datainterval);
1131 ptmin = min(ptmin, pt);
1132 }
1133 err = snd_usb_autoresume(subs->stream->chip);
1134 if (err < 0)
1135 return err;
1136
1137 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1138 if (subs->speed == USB_SPEED_FULL)
1139 /* full speed devices have fixed data packet interval */
1140 ptmin = 1000;
1141 if (ptmin == 1000)
1142 /* if period time doesn't go below 1 ms, no rules needed */
1143 param_period_time_if_needed = -1;
1144 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1145 ptmin, UINT_MAX);
1146
1147 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1148 hw_rule_rate, subs,
1149 SNDRV_PCM_HW_PARAM_FORMAT,
1150 SNDRV_PCM_HW_PARAM_CHANNELS,
1151 param_period_time_if_needed,
1152 -1)) < 0)
1153 goto rep_err;
1154 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1155 hw_rule_channels, subs,
1156 SNDRV_PCM_HW_PARAM_FORMAT,
1157 SNDRV_PCM_HW_PARAM_RATE,
1158 param_period_time_if_needed,
1159 -1)) < 0)
1160 goto rep_err;
1161 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1162 hw_rule_format, subs,
1163 SNDRV_PCM_HW_PARAM_RATE,
1164 SNDRV_PCM_HW_PARAM_CHANNELS,
1165 param_period_time_if_needed,
1166 -1)) < 0)
1167 goto rep_err;
1168 if (param_period_time_if_needed >= 0) {
1169 err = snd_pcm_hw_rule_add(runtime, 0,
1170 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1171 hw_rule_period_time, subs,
1172 SNDRV_PCM_HW_PARAM_FORMAT,
1173 SNDRV_PCM_HW_PARAM_CHANNELS,
1174 SNDRV_PCM_HW_PARAM_RATE,
1175 -1);
1176 if (err < 0)
1177 goto rep_err;
1178 }
1179 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1180 goto rep_err;
1181 return 0;
1182
1183rep_err:
1184 snd_usb_autosuspend(subs->stream->chip);
1185 return err;
1186}
1187
1188static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1189{
1190 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1191 struct snd_pcm_runtime *runtime = substream->runtime;
1192 struct snd_usb_substream *subs = &as->substream[direction];
1193
1194 subs->interface = -1;
1195 subs->altset_idx = 0;
1196 runtime->hw = snd_usb_hardware;
1197 runtime->private_data = subs;
1198 subs->pcm_substream = substream;
1199 /* runtime PM is also done there */
1200
1201 /* initialize DSD/DOP context */
1202 subs->dsd_dop.byte_idx = 0;
1203 subs->dsd_dop.channel = 0;
1204 subs->dsd_dop.marker = 1;
1205
1206 return setup_hw_info(runtime, subs);
1207}
1208
1209static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1210{
1211 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1212 struct snd_usb_substream *subs = &as->substream[direction];
1213
1214 stop_endpoints(subs, true);
1215
1216 if (!as->chip->shutdown && subs->interface >= 0) {
1217 usb_set_interface(subs->dev, subs->interface, 0);
1218 subs->interface = -1;
1219 }
1220
1221 subs->pcm_substream = NULL;
1222 snd_usb_autosuspend(subs->stream->chip);
1223
1224 return 0;
1225}
1226
1227/* Since a URB can handle only a single linear buffer, we must use double
1228 * buffering when the data to be transferred overflows the buffer boundary.
1229 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1230 * for all URBs.
1231 */
1232static void retire_capture_urb(struct snd_usb_substream *subs,
1233 struct urb *urb)
1234{
1235 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1236 unsigned int stride, frames, bytes, oldptr;
1237 int i, period_elapsed = 0;
1238 unsigned long flags;
1239 unsigned char *cp;
1240 int current_frame_number;
1241
1242 /* read frame number here, update pointer in critical section */
1243 current_frame_number = usb_get_current_frame_number(subs->dev);
1244
1245 stride = runtime->frame_bits >> 3;
1246
1247 for (i = 0; i < urb->number_of_packets; i++) {
1248 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1249 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1250 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1251 i, urb->iso_frame_desc[i].status);
1252 // continue;
1253 }
1254 bytes = urb->iso_frame_desc[i].actual_length;
1255 frames = bytes / stride;
1256 if (!subs->txfr_quirk)
1257 bytes = frames * stride;
1258 if (bytes % (runtime->sample_bits >> 3) != 0) {
1259 int oldbytes = bytes;
1260 bytes = frames * stride;
1261 dev_warn(&subs->dev->dev,
1262 "Corrected urb data len. %d->%d\n",
1263 oldbytes, bytes);
1264 }
1265 /* update the current pointer */
1266 spin_lock_irqsave(&subs->lock, flags);
1267 oldptr = subs->hwptr_done;
1268 subs->hwptr_done += bytes;
1269 if (subs->hwptr_done >= runtime->buffer_size * stride)
1270 subs->hwptr_done -= runtime->buffer_size * stride;
1271 frames = (bytes + (oldptr % stride)) / stride;
1272 subs->transfer_done += frames;
1273 if (subs->transfer_done >= runtime->period_size) {
1274 subs->transfer_done -= runtime->period_size;
1275 period_elapsed = 1;
1276 }
1277 /* capture delay is by construction limited to one URB,
1278 * reset delays here
1279 */
1280 runtime->delay = subs->last_delay = 0;
1281
1282 /* realign last_frame_number */
1283 subs->last_frame_number = current_frame_number;
1284 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1285
1286 spin_unlock_irqrestore(&subs->lock, flags);
1287 /* copy a data chunk */
1288 if (oldptr + bytes > runtime->buffer_size * stride) {
1289 unsigned int bytes1 =
1290 runtime->buffer_size * stride - oldptr;
1291 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1292 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1293 } else {
1294 memcpy(runtime->dma_area + oldptr, cp, bytes);
1295 }
1296 }
1297
1298 if (period_elapsed)
1299 snd_pcm_period_elapsed(subs->pcm_substream);
1300}
1301
1302static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1303 struct urb *urb, unsigned int bytes)
1304{
1305 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1306 unsigned int stride = runtime->frame_bits >> 3;
1307 unsigned int dst_idx = 0;
1308 unsigned int src_idx = subs->hwptr_done;
1309 unsigned int wrap = runtime->buffer_size * stride;
1310 u8 *dst = urb->transfer_buffer;
1311 u8 *src = runtime->dma_area;
1312 u8 marker[] = { 0x05, 0xfa };
1313
1314 /*
1315 * The DSP DOP format defines a way to transport DSD samples over
1316 * normal PCM data endpoints. It requires stuffing of marker bytes
1317 * (0x05 and 0xfa, alternating per sample frame), and then expects
1318 * 2 additional bytes of actual payload. The whole frame is stored
1319 * LSB.
1320 *
1321 * Hence, for a stereo transport, the buffer layout looks like this,
1322 * where L refers to left channel samples and R to right.
1323 *
1324 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1325 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1326 * .....
1327 *
1328 */
1329
1330 while (bytes--) {
1331 if (++subs->dsd_dop.byte_idx == 3) {
1332 /* frame boundary? */
1333 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1334 src_idx += 2;
1335 subs->dsd_dop.byte_idx = 0;
1336
1337 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1338 /* alternate the marker */
1339 subs->dsd_dop.marker++;
1340 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1341 subs->dsd_dop.channel = 0;
1342 }
1343 } else {
1344 /* stuff the DSD payload */
1345 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1346
1347 if (subs->cur_audiofmt->dsd_bitrev)
1348 dst[dst_idx++] = bitrev8(src[idx]);
1349 else
1350 dst[dst_idx++] = src[idx];
1351
1352 subs->hwptr_done++;
1353 }
1354 }
1355}
1356
1357static void prepare_playback_urb(struct snd_usb_substream *subs,
1358 struct urb *urb)
1359{
1360 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1361 struct snd_usb_endpoint *ep = subs->data_endpoint;
1362 struct snd_urb_ctx *ctx = urb->context;
1363 unsigned int counts, frames, bytes;
1364 int i, stride, period_elapsed = 0;
1365 unsigned long flags;
1366
1367 stride = runtime->frame_bits >> 3;
1368
1369 frames = 0;
1370 urb->number_of_packets = 0;
1371 spin_lock_irqsave(&subs->lock, flags);
1372 subs->frame_limit += ep->max_urb_frames;
1373 for (i = 0; i < ctx->packets; i++) {
1374 if (ctx->packet_size[i])
1375 counts = ctx->packet_size[i];
1376 else
1377 counts = snd_usb_endpoint_next_packet_size(ep);
1378
1379 /* set up descriptor */
1380 urb->iso_frame_desc[i].offset = frames * ep->stride;
1381 urb->iso_frame_desc[i].length = counts * ep->stride;
1382 frames += counts;
1383 urb->number_of_packets++;
1384 subs->transfer_done += counts;
1385 if (subs->transfer_done >= runtime->period_size) {
1386 subs->transfer_done -= runtime->period_size;
1387 subs->frame_limit = 0;
1388 period_elapsed = 1;
1389 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1390 if (subs->transfer_done > 0) {
1391 /* FIXME: fill-max mode is not
1392 * supported yet */
1393 frames -= subs->transfer_done;
1394 counts -= subs->transfer_done;
1395 urb->iso_frame_desc[i].length =
1396 counts * ep->stride;
1397 subs->transfer_done = 0;
1398 }
1399 i++;
1400 if (i < ctx->packets) {
1401 /* add a transfer delimiter */
1402 urb->iso_frame_desc[i].offset =
1403 frames * ep->stride;
1404 urb->iso_frame_desc[i].length = 0;
1405 urb->number_of_packets++;
1406 }
1407 break;
1408 }
1409 }
1410 /* finish at the period boundary or after enough frames */
1411 if ((period_elapsed ||
1412 subs->transfer_done >= subs->frame_limit) &&
1413 !snd_usb_endpoint_implicit_feedback_sink(ep))
1414 break;
1415 }
1416 bytes = frames * ep->stride;
1417
1418 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1419 subs->cur_audiofmt->dsd_dop)) {
1420 fill_playback_urb_dsd_dop(subs, urb, bytes);
1421 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1422 subs->cur_audiofmt->dsd_bitrev)) {
1423 /* bit-reverse the bytes */
1424 u8 *buf = urb->transfer_buffer;
1425 for (i = 0; i < bytes; i++) {
1426 int idx = (subs->hwptr_done + i)
1427 % (runtime->buffer_size * stride);
1428 buf[i] = bitrev8(runtime->dma_area[idx]);
1429 }
1430
1431 subs->hwptr_done += bytes;
1432 } else {
1433 /* usual PCM */
1434 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1435 /* err, the transferred area goes over buffer boundary. */
1436 unsigned int bytes1 =
1437 runtime->buffer_size * stride - subs->hwptr_done;
1438 memcpy(urb->transfer_buffer,
1439 runtime->dma_area + subs->hwptr_done, bytes1);
1440 memcpy(urb->transfer_buffer + bytes1,
1441 runtime->dma_area, bytes - bytes1);
1442 } else {
1443 memcpy(urb->transfer_buffer,
1444 runtime->dma_area + subs->hwptr_done, bytes);
1445 }
1446
1447 subs->hwptr_done += bytes;
1448 }
1449
1450 if (subs->hwptr_done >= runtime->buffer_size * stride)
1451 subs->hwptr_done -= runtime->buffer_size * stride;
1452
1453 /* update delay with exact number of samples queued */
1454 runtime->delay = subs->last_delay;
1455 runtime->delay += frames;
1456 subs->last_delay = runtime->delay;
1457
1458 /* realign last_frame_number */
1459 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1460 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1461
1462 spin_unlock_irqrestore(&subs->lock, flags);
1463 urb->transfer_buffer_length = bytes;
1464 if (period_elapsed)
1465 snd_pcm_period_elapsed(subs->pcm_substream);
1466}
1467
1468/*
1469 * process after playback data complete
1470 * - decrease the delay count again
1471 */
1472static void retire_playback_urb(struct snd_usb_substream *subs,
1473 struct urb *urb)
1474{
1475 unsigned long flags;
1476 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1477 struct snd_usb_endpoint *ep = subs->data_endpoint;
1478 int processed = urb->transfer_buffer_length / ep->stride;
1479 int est_delay;
1480
1481 /* ignore the delay accounting when procssed=0 is given, i.e.
1482 * silent payloads are procssed before handling the actual data
1483 */
1484 if (!processed)
1485 return;
1486
1487 spin_lock_irqsave(&subs->lock, flags);
1488 if (!subs->last_delay)
1489 goto out; /* short path */
1490
1491 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1492 /* update delay with exact number of samples played */
1493 if (processed > subs->last_delay)
1494 subs->last_delay = 0;
1495 else
1496 subs->last_delay -= processed;
1497 runtime->delay = subs->last_delay;
1498
1499 /*
1500 * Report when delay estimate is off by more than 2ms.
1501 * The error should be lower than 2ms since the estimate relies
1502 * on two reads of a counter updated every ms.
1503 */
1504 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1505 dev_dbg_ratelimited(&subs->dev->dev,
1506 "delay: estimated %d, actual %d\n",
1507 est_delay, subs->last_delay);
1508
1509 if (!subs->running) {
1510 /* update last_frame_number for delay counting here since
1511 * prepare_playback_urb won't be called during pause
1512 */
1513 subs->last_frame_number =
1514 usb_get_current_frame_number(subs->dev) & 0xff;
1515 }
1516
1517 out:
1518 spin_unlock_irqrestore(&subs->lock, flags);
1519}
1520
1521static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1522{
1523 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1524}
1525
1526static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1527{
1528 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1529}
1530
1531static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1532{
1533 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1534}
1535
1536static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1537{
1538 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1539}
1540
1541static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1542 int cmd)
1543{
1544 struct snd_usb_substream *subs = substream->runtime->private_data;
1545
1546 switch (cmd) {
1547 case SNDRV_PCM_TRIGGER_START:
1548 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1549 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1550 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1551 subs->running = 1;
1552 return 0;
1553 case SNDRV_PCM_TRIGGER_STOP:
1554 stop_endpoints(subs, false);
1555 subs->running = 0;
1556 return 0;
1557 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1558 subs->data_endpoint->prepare_data_urb = NULL;
1559 /* keep retire_data_urb for delay calculation */
1560 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1561 subs->running = 0;
1562 return 0;
1563 }
1564
1565 return -EINVAL;
1566}
1567
1568static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1569 int cmd)
1570{
1571 int err;
1572 struct snd_usb_substream *subs = substream->runtime->private_data;
1573
1574 switch (cmd) {
1575 case SNDRV_PCM_TRIGGER_START:
1576 err = start_endpoints(subs, false);
1577 if (err < 0)
1578 return err;
1579
1580 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1581 subs->running = 1;
1582 return 0;
1583 case SNDRV_PCM_TRIGGER_STOP:
1584 stop_endpoints(subs, false);
1585 subs->running = 0;
1586 return 0;
1587 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1588 subs->data_endpoint->retire_data_urb = NULL;
1589 subs->running = 0;
1590 return 0;
1591 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1592 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1593 subs->running = 1;
1594 return 0;
1595 }
1596
1597 return -EINVAL;
1598}
1599
1600static struct snd_pcm_ops snd_usb_playback_ops = {
1601 .open = snd_usb_playback_open,
1602 .close = snd_usb_playback_close,
1603 .ioctl = snd_pcm_lib_ioctl,
1604 .hw_params = snd_usb_hw_params,
1605 .hw_free = snd_usb_hw_free,
1606 .prepare = snd_usb_pcm_prepare,
1607 .trigger = snd_usb_substream_playback_trigger,
1608 .pointer = snd_usb_pcm_pointer,
1609 .page = snd_pcm_lib_get_vmalloc_page,
1610 .mmap = snd_pcm_lib_mmap_vmalloc,
1611};
1612
1613static struct snd_pcm_ops snd_usb_capture_ops = {
1614 .open = snd_usb_capture_open,
1615 .close = snd_usb_capture_close,
1616 .ioctl = snd_pcm_lib_ioctl,
1617 .hw_params = snd_usb_hw_params,
1618 .hw_free = snd_usb_hw_free,
1619 .prepare = snd_usb_pcm_prepare,
1620 .trigger = snd_usb_substream_capture_trigger,
1621 .pointer = snd_usb_pcm_pointer,
1622 .page = snd_pcm_lib_get_vmalloc_page,
1623 .mmap = snd_pcm_lib_mmap_vmalloc,
1624};
1625
1626void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1627{
1628 snd_pcm_set_ops(pcm, stream,
1629 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1630 &snd_usb_playback_ops : &snd_usb_capture_ops);
1631}
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 */
32static 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 */
72static 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 */
90static const struct audioformat *
91find_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
151static const struct audioformat *
152find_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
160static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
161{
162 struct usb_device *dev = chip->dev;
163 unsigned char data[1];
164 int err;
165
166 data[0] = 1;
167 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
170 data, sizeof(data));
171 return err;
172}
173
174static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
175{
176 struct usb_device *dev = chip->dev;
177 unsigned char data[1];
178 int err;
179
180 data[0] = 1;
181 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
182 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
183 UAC2_EP_CS_PITCH << 8, 0,
184 data, sizeof(data));
185 return err;
186}
187
188/*
189 * initialize the pitch control and sample rate
190 */
191int snd_usb_init_pitch(struct snd_usb_audio *chip,
192 const struct audioformat *fmt)
193{
194 int err;
195
196 /* if endpoint doesn't have pitch control, bail out */
197 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
198 return 0;
199
200 usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
201
202 switch (fmt->protocol) {
203 case UAC_VERSION_1:
204 err = init_pitch_v1(chip, fmt->endpoint);
205 break;
206 case UAC_VERSION_2:
207 err = init_pitch_v2(chip, fmt->endpoint);
208 break;
209 default:
210 return 0;
211 }
212
213 if (err < 0) {
214 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
215 fmt->endpoint);
216 return err;
217 }
218
219 return 0;
220}
221
222static bool stop_endpoints(struct snd_usb_substream *subs)
223{
224 bool stopped = 0;
225
226 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
227 snd_usb_endpoint_stop(subs->sync_endpoint);
228 stopped = true;
229 }
230 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
231 snd_usb_endpoint_stop(subs->data_endpoint);
232 stopped = true;
233 }
234 return stopped;
235}
236
237static int start_endpoints(struct snd_usb_substream *subs)
238{
239 int err;
240
241 if (!subs->data_endpoint)
242 return -EINVAL;
243
244 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
245 err = snd_usb_endpoint_start(subs->data_endpoint);
246 if (err < 0) {
247 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
248 goto error;
249 }
250 }
251
252 if (subs->sync_endpoint &&
253 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
254 err = snd_usb_endpoint_start(subs->sync_endpoint);
255 if (err < 0) {
256 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
257 goto error;
258 }
259 }
260
261 return 0;
262
263 error:
264 stop_endpoints(subs);
265 return err;
266}
267
268static void sync_pending_stops(struct snd_usb_substream *subs)
269{
270 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
271 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
272}
273
274/* PCM sync_stop callback */
275static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
276{
277 struct snd_usb_substream *subs = substream->runtime->private_data;
278
279 sync_pending_stops(subs);
280 return 0;
281}
282
283/* Set up sync endpoint */
284int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
285 struct audioformat *fmt)
286{
287 struct usb_device *dev = chip->dev;
288 struct usb_host_interface *alts;
289 struct usb_interface_descriptor *altsd;
290 unsigned int ep, attr, sync_attr;
291 bool is_playback;
292 int err;
293
294 alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
295 if (!alts)
296 return 0;
297 altsd = get_iface_desc(alts);
298
299 err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
300 if (err > 0)
301 return 0; /* matched */
302
303 /*
304 * Generic sync EP handling
305 */
306
307 if (altsd->bNumEndpoints < 2)
308 return 0;
309
310 is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
311 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
312 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
313 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
314 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
315 return 0;
316
317 sync_attr = get_endpoint(alts, 1)->bmAttributes;
318
319 /*
320 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
321 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
322 * error fall back to SYNC mode and don't create sync endpoint
323 */
324
325 /* check sync-pipe endpoint */
326 /* ... and check descriptor size before accessing bSynchAddress
327 because there is a version of the SB Audigy 2 NX firmware lacking
328 the audio fields in the endpoint descriptors */
329 if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
330 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
331 get_endpoint(alts, 1)->bSynchAddress != 0)) {
332 dev_err(&dev->dev,
333 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
334 fmt->iface, fmt->altsetting,
335 get_endpoint(alts, 1)->bmAttributes,
336 get_endpoint(alts, 1)->bLength,
337 get_endpoint(alts, 1)->bSynchAddress);
338 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
339 return 0;
340 return -EINVAL;
341 }
342 ep = get_endpoint(alts, 1)->bEndpointAddress;
343 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
344 get_endpoint(alts, 0)->bSynchAddress != 0 &&
345 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
346 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
347 dev_err(&dev->dev,
348 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
349 fmt->iface, fmt->altsetting,
350 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
351 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
352 return 0;
353 return -EINVAL;
354 }
355
356 fmt->sync_ep = ep;
357 fmt->sync_iface = altsd->bInterfaceNumber;
358 fmt->sync_altsetting = altsd->bAlternateSetting;
359 fmt->sync_ep_idx = 1;
360 if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
361 fmt->implicit_fb = 1;
362
363 dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
364 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
365 fmt->sync_altsetting, fmt->implicit_fb);
366
367 return 0;
368}
369
370static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
371{
372 int ret;
373
374 if (!subs->str_pd)
375 return 0;
376
377 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
378 if (ret < 0) {
379 dev_err(&subs->dev->dev,
380 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
381 subs->str_pd->pd_id, state, ret);
382 return ret;
383 }
384
385 return 0;
386}
387
388int snd_usb_pcm_suspend(struct snd_usb_stream *as)
389{
390 int ret;
391
392 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
393 if (ret < 0)
394 return ret;
395
396 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
397 if (ret < 0)
398 return ret;
399
400 return 0;
401}
402
403int snd_usb_pcm_resume(struct snd_usb_stream *as)
404{
405 int ret;
406
407 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
408 if (ret < 0)
409 return ret;
410
411 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
412 if (ret < 0)
413 return ret;
414
415 return 0;
416}
417
418static void close_endpoints(struct snd_usb_audio *chip,
419 struct snd_usb_substream *subs)
420{
421 if (subs->data_endpoint) {
422 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
423 snd_usb_endpoint_close(chip, subs->data_endpoint);
424 subs->data_endpoint = NULL;
425 }
426
427 if (subs->sync_endpoint) {
428 snd_usb_endpoint_close(chip, subs->sync_endpoint);
429 subs->sync_endpoint = NULL;
430 }
431}
432
433static int configure_endpoints(struct snd_usb_audio *chip,
434 struct snd_usb_substream *subs)
435{
436 int err;
437
438 if (subs->data_endpoint->need_setup) {
439 /* stop any running stream beforehand */
440 if (stop_endpoints(subs))
441 sync_pending_stops(subs);
442 err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
443 if (err < 0)
444 return err;
445 snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
446 }
447
448 if (subs->sync_endpoint) {
449 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
450 if (err < 0)
451 return err;
452 }
453
454 return 0;
455}
456
457/*
458 * hw_params callback
459 *
460 * allocate a buffer and set the given audio format.
461 *
462 * so far we use a physically linear buffer although packetize transfer
463 * doesn't need a continuous area.
464 * if sg buffer is supported on the later version of alsa, we'll follow
465 * that.
466 */
467static int snd_usb_hw_params(struct snd_pcm_substream *substream,
468 struct snd_pcm_hw_params *hw_params)
469{
470 struct snd_usb_substream *subs = substream->runtime->private_data;
471 struct snd_usb_audio *chip = subs->stream->chip;
472 const struct audioformat *fmt;
473 const struct audioformat *sync_fmt;
474 int ret;
475
476 ret = snd_media_start_pipeline(subs);
477 if (ret)
478 return ret;
479
480 fmt = find_substream_format(subs, hw_params);
481 if (!fmt) {
482 usb_audio_dbg(chip,
483 "cannot find format: format=%s, rate=%d, channels=%d\n",
484 snd_pcm_format_name(params_format(hw_params)),
485 params_rate(hw_params), params_channels(hw_params));
486 ret = -EINVAL;
487 goto stop_pipeline;
488 }
489
490 if (fmt->implicit_fb) {
491 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
492 hw_params,
493 !substream->stream);
494 if (!sync_fmt) {
495 usb_audio_dbg(chip,
496 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
497 fmt->sync_ep, fmt->sync_iface,
498 fmt->sync_altsetting,
499 snd_pcm_format_name(params_format(hw_params)),
500 params_rate(hw_params), params_channels(hw_params));
501 ret = -EINVAL;
502 goto stop_pipeline;
503 }
504 } else {
505 sync_fmt = fmt;
506 }
507
508 ret = snd_usb_lock_shutdown(chip);
509 if (ret < 0)
510 goto stop_pipeline;
511
512 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
513 if (ret < 0)
514 goto unlock;
515
516 if (subs->data_endpoint) {
517 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
518 fmt, hw_params))
519 goto unlock;
520 close_endpoints(chip, subs);
521 }
522
523 subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
524 if (!subs->data_endpoint) {
525 ret = -EINVAL;
526 goto unlock;
527 }
528
529 if (fmt->sync_ep) {
530 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
531 hw_params,
532 fmt == sync_fmt);
533 if (!subs->sync_endpoint) {
534 ret = -EINVAL;
535 goto unlock;
536 }
537
538 snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
539 subs->sync_endpoint);
540 }
541
542 mutex_lock(&chip->mutex);
543 subs->cur_audiofmt = fmt;
544 mutex_unlock(&chip->mutex);
545
546 ret = configure_endpoints(chip, subs);
547
548 unlock:
549 if (ret < 0)
550 close_endpoints(chip, subs);
551
552 snd_usb_unlock_shutdown(chip);
553 stop_pipeline:
554 if (ret < 0)
555 snd_media_stop_pipeline(subs);
556
557 return ret;
558}
559
560/*
561 * hw_free callback
562 *
563 * reset the audio format and release the buffer
564 */
565static int snd_usb_hw_free(struct snd_pcm_substream *substream)
566{
567 struct snd_usb_substream *subs = substream->runtime->private_data;
568 struct snd_usb_audio *chip = subs->stream->chip;
569
570 snd_media_stop_pipeline(subs);
571 mutex_lock(&chip->mutex);
572 subs->cur_audiofmt = NULL;
573 mutex_unlock(&chip->mutex);
574 if (!snd_usb_lock_shutdown(chip)) {
575 if (stop_endpoints(subs))
576 sync_pending_stops(subs);
577 close_endpoints(chip, subs);
578 snd_usb_unlock_shutdown(chip);
579 }
580
581 return 0;
582}
583
584/*
585 * prepare callback
586 *
587 * only a few subtle things...
588 */
589static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
590{
591 struct snd_pcm_runtime *runtime = substream->runtime;
592 struct snd_usb_substream *subs = runtime->private_data;
593 struct snd_usb_audio *chip = subs->stream->chip;
594 int ret;
595
596 ret = snd_usb_lock_shutdown(chip);
597 if (ret < 0)
598 return ret;
599 if (snd_BUG_ON(!subs->data_endpoint)) {
600 ret = -EIO;
601 goto unlock;
602 }
603
604 ret = configure_endpoints(chip, subs);
605 if (ret < 0)
606 goto unlock;
607
608 /* reset the pointer */
609 subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
610 subs->inflight_bytes = 0;
611 subs->hwptr_done = 0;
612 subs->transfer_done = 0;
613 subs->last_frame_number = 0;
614 subs->period_elapsed_pending = 0;
615 runtime->delay = 0;
616
617 /* check whether early start is needed for playback stream */
618 subs->early_playback_start =
619 subs->direction == SNDRV_PCM_STREAM_PLAYBACK &&
620 (!chip->lowlatency ||
621 (subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes));
622
623 if (subs->early_playback_start)
624 ret = start_endpoints(subs);
625
626 unlock:
627 snd_usb_unlock_shutdown(chip);
628 return ret;
629}
630
631/*
632 * h/w constraints
633 */
634
635#ifdef HW_CONST_DEBUG
636#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
637#else
638#define hwc_debug(fmt, args...) do { } while(0)
639#endif
640
641static const struct snd_pcm_hardware snd_usb_hardware =
642{
643 .info = SNDRV_PCM_INFO_MMAP |
644 SNDRV_PCM_INFO_MMAP_VALID |
645 SNDRV_PCM_INFO_BATCH |
646 SNDRV_PCM_INFO_INTERLEAVED |
647 SNDRV_PCM_INFO_BLOCK_TRANSFER |
648 SNDRV_PCM_INFO_PAUSE,
649 .channels_min = 1,
650 .channels_max = 256,
651 .buffer_bytes_max = 1024 * 1024,
652 .period_bytes_min = 64,
653 .period_bytes_max = 512 * 1024,
654 .periods_min = 2,
655 .periods_max = 1024,
656};
657
658static int hw_check_valid_format(struct snd_usb_substream *subs,
659 struct snd_pcm_hw_params *params,
660 const struct audioformat *fp)
661{
662 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
663 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
664 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
665 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
666 struct snd_mask check_fmts;
667 unsigned int ptime;
668
669 /* check the format */
670 snd_mask_none(&check_fmts);
671 check_fmts.bits[0] = (u32)fp->formats;
672 check_fmts.bits[1] = (u32)(fp->formats >> 32);
673 snd_mask_intersect(&check_fmts, fmts);
674 if (snd_mask_empty(&check_fmts)) {
675 hwc_debug(" > check: no supported format 0x%llx\n", fp->formats);
676 return 0;
677 }
678 /* check the channels */
679 if (fp->channels < ct->min || fp->channels > ct->max) {
680 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
681 return 0;
682 }
683 /* check the rate is within the range */
684 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
685 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
686 return 0;
687 }
688 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
689 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
690 return 0;
691 }
692 /* check whether the period time is >= the data packet interval */
693 if (subs->speed != USB_SPEED_FULL) {
694 ptime = 125 * (1 << fp->datainterval);
695 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
696 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
697 return 0;
698 }
699 }
700 return 1;
701}
702
703static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
704 unsigned int rmax)
705{
706 int changed;
707
708 if (rmin > rmax) {
709 hwc_debug(" --> get empty\n");
710 it->empty = 1;
711 return -EINVAL;
712 }
713
714 changed = 0;
715 if (it->min < rmin) {
716 it->min = rmin;
717 it->openmin = 0;
718 changed = 1;
719 }
720 if (it->max > rmax) {
721 it->max = rmax;
722 it->openmax = 0;
723 changed = 1;
724 }
725 if (snd_interval_checkempty(it)) {
726 it->empty = 1;
727 return -EINVAL;
728 }
729 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
730 return changed;
731}
732
733static int hw_rule_rate(struct snd_pcm_hw_params *params,
734 struct snd_pcm_hw_rule *rule)
735{
736 struct snd_usb_substream *subs = rule->private;
737 const struct audioformat *fp;
738 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
739 unsigned int rmin, rmax, r;
740 int i;
741
742 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
743 rmin = UINT_MAX;
744 rmax = 0;
745 list_for_each_entry(fp, &subs->fmt_list, list) {
746 if (!hw_check_valid_format(subs, params, fp))
747 continue;
748 if (fp->rate_table && fp->nr_rates) {
749 for (i = 0; i < fp->nr_rates; i++) {
750 r = fp->rate_table[i];
751 if (!snd_interval_test(it, r))
752 continue;
753 rmin = min(rmin, r);
754 rmax = max(rmax, r);
755 }
756 } else {
757 rmin = min(rmin, fp->rate_min);
758 rmax = max(rmax, fp->rate_max);
759 }
760 }
761
762 return apply_hw_params_minmax(it, rmin, rmax);
763}
764
765
766static int hw_rule_channels(struct snd_pcm_hw_params *params,
767 struct snd_pcm_hw_rule *rule)
768{
769 struct snd_usb_substream *subs = rule->private;
770 const struct audioformat *fp;
771 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
772 unsigned int rmin, rmax;
773
774 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
775 rmin = UINT_MAX;
776 rmax = 0;
777 list_for_each_entry(fp, &subs->fmt_list, list) {
778 if (!hw_check_valid_format(subs, params, fp))
779 continue;
780 rmin = min(rmin, fp->channels);
781 rmax = max(rmax, fp->channels);
782 }
783
784 return apply_hw_params_minmax(it, rmin, rmax);
785}
786
787static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
788{
789 u32 oldbits[2];
790 int changed;
791
792 oldbits[0] = fmt->bits[0];
793 oldbits[1] = fmt->bits[1];
794 fmt->bits[0] &= (u32)fbits;
795 fmt->bits[1] &= (u32)(fbits >> 32);
796 if (!fmt->bits[0] && !fmt->bits[1]) {
797 hwc_debug(" --> get empty\n");
798 return -EINVAL;
799 }
800 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
801 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
802 return changed;
803}
804
805static int hw_rule_format(struct snd_pcm_hw_params *params,
806 struct snd_pcm_hw_rule *rule)
807{
808 struct snd_usb_substream *subs = rule->private;
809 const struct audioformat *fp;
810 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
811 u64 fbits;
812
813 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
814 fbits = 0;
815 list_for_each_entry(fp, &subs->fmt_list, list) {
816 if (!hw_check_valid_format(subs, params, fp))
817 continue;
818 fbits |= fp->formats;
819 }
820 return apply_hw_params_format_bits(fmt, fbits);
821}
822
823static int hw_rule_period_time(struct snd_pcm_hw_params *params,
824 struct snd_pcm_hw_rule *rule)
825{
826 struct snd_usb_substream *subs = rule->private;
827 const struct audioformat *fp;
828 struct snd_interval *it;
829 unsigned char min_datainterval;
830 unsigned int pmin;
831
832 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
833 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
834 min_datainterval = 0xff;
835 list_for_each_entry(fp, &subs->fmt_list, list) {
836 if (!hw_check_valid_format(subs, params, fp))
837 continue;
838 min_datainterval = min(min_datainterval, fp->datainterval);
839 }
840 if (min_datainterval == 0xff) {
841 hwc_debug(" --> get empty\n");
842 it->empty = 1;
843 return -EINVAL;
844 }
845 pmin = 125 * (1 << min_datainterval);
846
847 return apply_hw_params_minmax(it, pmin, UINT_MAX);
848}
849
850/* get the EP or the sync EP for implicit fb when it's already set up */
851static const struct snd_usb_endpoint *
852get_sync_ep_from_substream(struct snd_usb_substream *subs)
853{
854 struct snd_usb_audio *chip = subs->stream->chip;
855 const struct audioformat *fp;
856 const struct snd_usb_endpoint *ep;
857
858 list_for_each_entry(fp, &subs->fmt_list, list) {
859 ep = snd_usb_get_endpoint(chip, fp->endpoint);
860 if (ep && ep->cur_audiofmt) {
861 /* if EP is already opened solely for this substream,
862 * we still allow us to change the parameter; otherwise
863 * this substream has to follow the existing parameter
864 */
865 if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1)
866 return ep;
867 }
868 if (!fp->implicit_fb)
869 continue;
870 /* for the implicit fb, check the sync ep as well */
871 ep = snd_usb_get_endpoint(chip, fp->sync_ep);
872 if (ep && ep->cur_audiofmt)
873 return ep;
874 }
875 return NULL;
876}
877
878/* additional hw constraints for implicit feedback mode */
879static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params,
880 struct snd_pcm_hw_rule *rule)
881{
882 struct snd_usb_substream *subs = rule->private;
883 const struct snd_usb_endpoint *ep;
884 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
885
886 ep = get_sync_ep_from_substream(subs);
887 if (!ep)
888 return 0;
889
890 hwc_debug("applying %s\n", __func__);
891 return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format));
892}
893
894static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params,
895 struct snd_pcm_hw_rule *rule)
896{
897 struct snd_usb_substream *subs = rule->private;
898 const struct snd_usb_endpoint *ep;
899 struct snd_interval *it;
900
901 ep = get_sync_ep_from_substream(subs);
902 if (!ep)
903 return 0;
904
905 hwc_debug("applying %s\n", __func__);
906 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
907 return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate);
908}
909
910static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
911 struct snd_pcm_hw_rule *rule)
912{
913 struct snd_usb_substream *subs = rule->private;
914 const struct snd_usb_endpoint *ep;
915 struct snd_interval *it;
916
917 ep = get_sync_ep_from_substream(subs);
918 if (!ep)
919 return 0;
920
921 hwc_debug("applying %s\n", __func__);
922 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
923 return apply_hw_params_minmax(it, ep->cur_period_frames,
924 ep->cur_period_frames);
925}
926
927static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
928 struct snd_pcm_hw_rule *rule)
929{
930 struct snd_usb_substream *subs = rule->private;
931 const struct snd_usb_endpoint *ep;
932 struct snd_interval *it;
933
934 ep = get_sync_ep_from_substream(subs);
935 if (!ep)
936 return 0;
937
938 hwc_debug("applying %s\n", __func__);
939 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
940 return apply_hw_params_minmax(it, ep->cur_buffer_periods,
941 ep->cur_buffer_periods);
942}
943
944/*
945 * set up the runtime hardware information.
946 */
947
948static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
949{
950 const struct audioformat *fp;
951 unsigned int pt, ptmin;
952 int param_period_time_if_needed = -1;
953 int err;
954
955 runtime->hw.formats = subs->formats;
956
957 runtime->hw.rate_min = 0x7fffffff;
958 runtime->hw.rate_max = 0;
959 runtime->hw.channels_min = 256;
960 runtime->hw.channels_max = 0;
961 runtime->hw.rates = 0;
962 ptmin = UINT_MAX;
963 /* check min/max rates and channels */
964 list_for_each_entry(fp, &subs->fmt_list, list) {
965 runtime->hw.rates |= fp->rates;
966 if (runtime->hw.rate_min > fp->rate_min)
967 runtime->hw.rate_min = fp->rate_min;
968 if (runtime->hw.rate_max < fp->rate_max)
969 runtime->hw.rate_max = fp->rate_max;
970 if (runtime->hw.channels_min > fp->channels)
971 runtime->hw.channels_min = fp->channels;
972 if (runtime->hw.channels_max < fp->channels)
973 runtime->hw.channels_max = fp->channels;
974 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
975 /* FIXME: there might be more than one audio formats... */
976 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
977 fp->frame_size;
978 }
979 pt = 125 * (1 << fp->datainterval);
980 ptmin = min(ptmin, pt);
981 }
982
983 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
984 if (subs->speed == USB_SPEED_FULL)
985 /* full speed devices have fixed data packet interval */
986 ptmin = 1000;
987 if (ptmin == 1000)
988 /* if period time doesn't go below 1 ms, no rules needed */
989 param_period_time_if_needed = -1;
990
991 err = snd_pcm_hw_constraint_minmax(runtime,
992 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
993 ptmin, UINT_MAX);
994 if (err < 0)
995 return err;
996
997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
998 hw_rule_rate, subs,
999 SNDRV_PCM_HW_PARAM_RATE,
1000 SNDRV_PCM_HW_PARAM_FORMAT,
1001 SNDRV_PCM_HW_PARAM_CHANNELS,
1002 param_period_time_if_needed,
1003 -1);
1004 if (err < 0)
1005 return err;
1006
1007 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1008 hw_rule_channels, subs,
1009 SNDRV_PCM_HW_PARAM_CHANNELS,
1010 SNDRV_PCM_HW_PARAM_FORMAT,
1011 SNDRV_PCM_HW_PARAM_RATE,
1012 param_period_time_if_needed,
1013 -1);
1014 if (err < 0)
1015 return err;
1016 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1017 hw_rule_format, subs,
1018 SNDRV_PCM_HW_PARAM_FORMAT,
1019 SNDRV_PCM_HW_PARAM_RATE,
1020 SNDRV_PCM_HW_PARAM_CHANNELS,
1021 param_period_time_if_needed,
1022 -1);
1023 if (err < 0)
1024 return err;
1025 if (param_period_time_if_needed >= 0) {
1026 err = snd_pcm_hw_rule_add(runtime, 0,
1027 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1028 hw_rule_period_time, subs,
1029 SNDRV_PCM_HW_PARAM_FORMAT,
1030 SNDRV_PCM_HW_PARAM_CHANNELS,
1031 SNDRV_PCM_HW_PARAM_RATE,
1032 -1);
1033 if (err < 0)
1034 return err;
1035 }
1036
1037 /* additional hw constraints for implicit fb */
1038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1039 hw_rule_format_implicit_fb, subs,
1040 SNDRV_PCM_HW_PARAM_FORMAT, -1);
1041 if (err < 0)
1042 return err;
1043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1044 hw_rule_rate_implicit_fb, subs,
1045 SNDRV_PCM_HW_PARAM_RATE, -1);
1046 if (err < 0)
1047 return err;
1048 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1049 hw_rule_period_size_implicit_fb, subs,
1050 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1051 if (err < 0)
1052 return err;
1053 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1054 hw_rule_periods_implicit_fb, subs,
1055 SNDRV_PCM_HW_PARAM_PERIODS, -1);
1056 if (err < 0)
1057 return err;
1058
1059 return 0;
1060}
1061
1062static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1063{
1064 int direction = substream->stream;
1065 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1066 struct snd_pcm_runtime *runtime = substream->runtime;
1067 struct snd_usb_substream *subs = &as->substream[direction];
1068 int ret;
1069
1070 runtime->hw = snd_usb_hardware;
1071 runtime->private_data = subs;
1072 subs->pcm_substream = substream;
1073 /* runtime PM is also done there */
1074
1075 /* initialize DSD/DOP context */
1076 subs->dsd_dop.byte_idx = 0;
1077 subs->dsd_dop.channel = 0;
1078 subs->dsd_dop.marker = 1;
1079
1080 ret = setup_hw_info(runtime, subs);
1081 if (ret < 0)
1082 return ret;
1083 ret = snd_usb_autoresume(subs->stream->chip);
1084 if (ret < 0)
1085 return ret;
1086 ret = snd_media_stream_init(subs, as->pcm, direction);
1087 if (ret < 0)
1088 snd_usb_autosuspend(subs->stream->chip);
1089 return ret;
1090}
1091
1092static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1093{
1094 int direction = substream->stream;
1095 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1096 struct snd_usb_substream *subs = &as->substream[direction];
1097 int ret;
1098
1099 snd_media_stop_pipeline(subs);
1100
1101 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
1102 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1103 snd_usb_unlock_shutdown(subs->stream->chip);
1104 if (ret < 0)
1105 return ret;
1106 }
1107
1108 subs->pcm_substream = NULL;
1109 snd_usb_autosuspend(subs->stream->chip);
1110
1111 return 0;
1112}
1113
1114/* Since a URB can handle only a single linear buffer, we must use double
1115 * buffering when the data to be transferred overflows the buffer boundary.
1116 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1117 * for all URBs.
1118 */
1119static void retire_capture_urb(struct snd_usb_substream *subs,
1120 struct urb *urb)
1121{
1122 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1123 unsigned int stride, frames, bytes, oldptr;
1124 int i, period_elapsed = 0;
1125 unsigned long flags;
1126 unsigned char *cp;
1127 int current_frame_number;
1128
1129 /* read frame number here, update pointer in critical section */
1130 current_frame_number = usb_get_current_frame_number(subs->dev);
1131
1132 stride = runtime->frame_bits >> 3;
1133
1134 for (i = 0; i < urb->number_of_packets; i++) {
1135 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1136 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1137 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1138 i, urb->iso_frame_desc[i].status);
1139 // continue;
1140 }
1141 bytes = urb->iso_frame_desc[i].actual_length;
1142 if (subs->stream_offset_adj > 0) {
1143 unsigned int adj = min(subs->stream_offset_adj, bytes);
1144 cp += adj;
1145 bytes -= adj;
1146 subs->stream_offset_adj -= adj;
1147 }
1148 frames = bytes / stride;
1149 if (!subs->txfr_quirk)
1150 bytes = frames * stride;
1151 if (bytes % (runtime->sample_bits >> 3) != 0) {
1152 int oldbytes = bytes;
1153 bytes = frames * stride;
1154 dev_warn_ratelimited(&subs->dev->dev,
1155 "Corrected urb data len. %d->%d\n",
1156 oldbytes, bytes);
1157 }
1158 /* update the current pointer */
1159 spin_lock_irqsave(&subs->lock, flags);
1160 oldptr = subs->hwptr_done;
1161 subs->hwptr_done += bytes;
1162 if (subs->hwptr_done >= subs->buffer_bytes)
1163 subs->hwptr_done -= subs->buffer_bytes;
1164 frames = (bytes + (oldptr % stride)) / stride;
1165 subs->transfer_done += frames;
1166 if (subs->transfer_done >= runtime->period_size) {
1167 subs->transfer_done -= runtime->period_size;
1168 period_elapsed = 1;
1169 }
1170
1171 /* realign last_frame_number */
1172 subs->last_frame_number = current_frame_number;
1173
1174 spin_unlock_irqrestore(&subs->lock, flags);
1175 /* copy a data chunk */
1176 if (oldptr + bytes > subs->buffer_bytes) {
1177 unsigned int bytes1 = subs->buffer_bytes - oldptr;
1178
1179 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1180 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1181 } else {
1182 memcpy(runtime->dma_area + oldptr, cp, bytes);
1183 }
1184 }
1185
1186 if (period_elapsed)
1187 snd_pcm_period_elapsed(subs->pcm_substream);
1188}
1189
1190static void urb_ctx_queue_advance(struct snd_usb_substream *subs,
1191 struct urb *urb, unsigned int bytes)
1192{
1193 struct snd_urb_ctx *ctx = urb->context;
1194
1195 ctx->queued += bytes;
1196 subs->inflight_bytes += bytes;
1197 subs->hwptr_done += bytes;
1198 if (subs->hwptr_done >= subs->buffer_bytes)
1199 subs->hwptr_done -= subs->buffer_bytes;
1200}
1201
1202static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1203 struct urb *urb, unsigned int bytes)
1204{
1205 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1206 unsigned int dst_idx = 0;
1207 unsigned int src_idx = subs->hwptr_done;
1208 unsigned int wrap = subs->buffer_bytes;
1209 u8 *dst = urb->transfer_buffer;
1210 u8 *src = runtime->dma_area;
1211 u8 marker[] = { 0x05, 0xfa };
1212 unsigned int queued = 0;
1213
1214 /*
1215 * The DSP DOP format defines a way to transport DSD samples over
1216 * normal PCM data endpoints. It requires stuffing of marker bytes
1217 * (0x05 and 0xfa, alternating per sample frame), and then expects
1218 * 2 additional bytes of actual payload. The whole frame is stored
1219 * LSB.
1220 *
1221 * Hence, for a stereo transport, the buffer layout looks like this,
1222 * where L refers to left channel samples and R to right.
1223 *
1224 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1225 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1226 * .....
1227 *
1228 */
1229
1230 while (bytes--) {
1231 if (++subs->dsd_dop.byte_idx == 3) {
1232 /* frame boundary? */
1233 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1234 src_idx += 2;
1235 subs->dsd_dop.byte_idx = 0;
1236
1237 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1238 /* alternate the marker */
1239 subs->dsd_dop.marker++;
1240 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1241 subs->dsd_dop.channel = 0;
1242 }
1243 } else {
1244 /* stuff the DSD payload */
1245 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1246
1247 if (subs->cur_audiofmt->dsd_bitrev)
1248 dst[dst_idx++] = bitrev8(src[idx]);
1249 else
1250 dst[dst_idx++] = src[idx];
1251 queued++;
1252 }
1253 }
1254
1255 urb_ctx_queue_advance(subs, urb, queued);
1256}
1257
1258/* copy bit-reversed bytes onto transfer buffer */
1259static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
1260 struct urb *urb, unsigned int bytes)
1261{
1262 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1263 const u8 *src = runtime->dma_area;
1264 u8 *buf = urb->transfer_buffer;
1265 int i, ofs = subs->hwptr_done;
1266
1267 for (i = 0; i < bytes; i++) {
1268 *buf++ = bitrev8(src[ofs]);
1269 if (++ofs >= subs->buffer_bytes)
1270 ofs = 0;
1271 }
1272
1273 urb_ctx_queue_advance(subs, urb, bytes);
1274}
1275
1276static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1277 int offset, int stride, unsigned int bytes)
1278{
1279 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1280
1281 if (subs->hwptr_done + bytes > subs->buffer_bytes) {
1282 /* err, the transferred area goes over buffer boundary. */
1283 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done;
1284
1285 memcpy(urb->transfer_buffer + offset,
1286 runtime->dma_area + subs->hwptr_done, bytes1);
1287 memcpy(urb->transfer_buffer + offset + bytes1,
1288 runtime->dma_area, bytes - bytes1);
1289 } else {
1290 memcpy(urb->transfer_buffer + offset,
1291 runtime->dma_area + subs->hwptr_done, bytes);
1292 }
1293
1294 urb_ctx_queue_advance(subs, urb, bytes);
1295}
1296
1297static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1298 struct urb *urb, int stride,
1299 unsigned int bytes)
1300{
1301 __le32 packet_length;
1302 int i;
1303
1304 /* Put __le32 length descriptor at start of each packet. */
1305 for (i = 0; i < urb->number_of_packets; i++) {
1306 unsigned int length = urb->iso_frame_desc[i].length;
1307 unsigned int offset = urb->iso_frame_desc[i].offset;
1308
1309 packet_length = cpu_to_le32(length);
1310 offset += i * sizeof(packet_length);
1311 urb->iso_frame_desc[i].offset = offset;
1312 urb->iso_frame_desc[i].length += sizeof(packet_length);
1313 memcpy(urb->transfer_buffer + offset,
1314 &packet_length, sizeof(packet_length));
1315 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1316 stride, length);
1317 }
1318 /* Adjust transfer size accordingly. */
1319 bytes += urb->number_of_packets * sizeof(packet_length);
1320 return bytes;
1321}
1322
1323static void prepare_playback_urb(struct snd_usb_substream *subs,
1324 struct urb *urb)
1325{
1326 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1327 struct snd_usb_endpoint *ep = subs->data_endpoint;
1328 struct snd_urb_ctx *ctx = urb->context;
1329 unsigned int counts, frames, bytes;
1330 int i, stride, period_elapsed = 0;
1331 unsigned long flags;
1332
1333 stride = ep->stride;
1334
1335 frames = 0;
1336 ctx->queued = 0;
1337 urb->number_of_packets = 0;
1338 spin_lock_irqsave(&subs->lock, flags);
1339 subs->frame_limit += ep->max_urb_frames;
1340 for (i = 0; i < ctx->packets; i++) {
1341 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
1342 /* set up descriptor */
1343 urb->iso_frame_desc[i].offset = frames * stride;
1344 urb->iso_frame_desc[i].length = counts * stride;
1345 frames += counts;
1346 urb->number_of_packets++;
1347 subs->transfer_done += counts;
1348 if (subs->transfer_done >= runtime->period_size) {
1349 subs->transfer_done -= runtime->period_size;
1350 subs->frame_limit = 0;
1351 period_elapsed = 1;
1352 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1353 if (subs->transfer_done > 0) {
1354 /* FIXME: fill-max mode is not
1355 * supported yet */
1356 frames -= subs->transfer_done;
1357 counts -= subs->transfer_done;
1358 urb->iso_frame_desc[i].length =
1359 counts * stride;
1360 subs->transfer_done = 0;
1361 }
1362 i++;
1363 if (i < ctx->packets) {
1364 /* add a transfer delimiter */
1365 urb->iso_frame_desc[i].offset =
1366 frames * stride;
1367 urb->iso_frame_desc[i].length = 0;
1368 urb->number_of_packets++;
1369 }
1370 break;
1371 }
1372 }
1373 /* finish at the period boundary or after enough frames */
1374 if ((period_elapsed ||
1375 subs->transfer_done >= subs->frame_limit) &&
1376 !snd_usb_endpoint_implicit_feedback_sink(ep))
1377 break;
1378 }
1379 bytes = frames * stride;
1380
1381 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1382 subs->cur_audiofmt->dsd_dop)) {
1383 fill_playback_urb_dsd_dop(subs, urb, bytes);
1384 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1385 subs->cur_audiofmt->dsd_bitrev)) {
1386 fill_playback_urb_dsd_bitrev(subs, urb, bytes);
1387 } else {
1388 /* usual PCM */
1389 if (!subs->tx_length_quirk)
1390 copy_to_urb(subs, urb, 0, stride, bytes);
1391 else
1392 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1393 /* bytes is now amount of outgoing data */
1394 }
1395
1396 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1397
1398 if (subs->trigger_tstamp_pending_update) {
1399 /* this is the first actual URB submitted,
1400 * update trigger timestamp to reflect actual start time
1401 */
1402 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1403 subs->trigger_tstamp_pending_update = false;
1404 }
1405
1406 if (period_elapsed && !subs->running && !subs->early_playback_start) {
1407 subs->period_elapsed_pending = 1;
1408 period_elapsed = 0;
1409 }
1410 spin_unlock_irqrestore(&subs->lock, flags);
1411 urb->transfer_buffer_length = bytes;
1412 if (period_elapsed)
1413 snd_pcm_period_elapsed(subs->pcm_substream);
1414}
1415
1416/*
1417 * process after playback data complete
1418 * - decrease the delay count again
1419 */
1420static void retire_playback_urb(struct snd_usb_substream *subs,
1421 struct urb *urb)
1422{
1423 unsigned long flags;
1424 struct snd_urb_ctx *ctx = urb->context;
1425 bool period_elapsed = false;
1426
1427 spin_lock_irqsave(&subs->lock, flags);
1428 if (ctx->queued) {
1429 if (subs->inflight_bytes >= ctx->queued)
1430 subs->inflight_bytes -= ctx->queued;
1431 else
1432 subs->inflight_bytes = 0;
1433 }
1434
1435 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1436 if (subs->running) {
1437 period_elapsed = subs->period_elapsed_pending;
1438 subs->period_elapsed_pending = 0;
1439 }
1440 spin_unlock_irqrestore(&subs->lock, flags);
1441 if (period_elapsed)
1442 snd_pcm_period_elapsed(subs->pcm_substream);
1443}
1444
1445static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1446 int cmd)
1447{
1448 struct snd_usb_substream *subs = substream->runtime->private_data;
1449 int err;
1450
1451 switch (cmd) {
1452 case SNDRV_PCM_TRIGGER_START:
1453 subs->trigger_tstamp_pending_update = true;
1454 fallthrough;
1455 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1456 snd_usb_endpoint_set_callback(subs->data_endpoint,
1457 prepare_playback_urb,
1458 retire_playback_urb,
1459 subs);
1460 if (!subs->early_playback_start &&
1461 cmd == SNDRV_PCM_TRIGGER_START) {
1462 err = start_endpoints(subs);
1463 if (err < 0) {
1464 snd_usb_endpoint_set_callback(subs->data_endpoint,
1465 NULL, NULL, NULL);
1466 return err;
1467 }
1468 }
1469 subs->running = 1;
1470 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
1471 subs->cur_audiofmt->iface,
1472 subs->cur_audiofmt->altsetting);
1473 return 0;
1474 case SNDRV_PCM_TRIGGER_SUSPEND:
1475 case SNDRV_PCM_TRIGGER_STOP:
1476 stop_endpoints(subs);
1477 snd_usb_endpoint_set_callback(subs->data_endpoint,
1478 NULL, NULL, NULL);
1479 subs->running = 0;
1480 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
1481 subs->cur_audiofmt->iface,
1482 subs->cur_audiofmt->altsetting);
1483 return 0;
1484 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1485 /* keep retire_data_urb for delay calculation */
1486 snd_usb_endpoint_set_callback(subs->data_endpoint,
1487 NULL,
1488 retire_playback_urb,
1489 subs);
1490 subs->running = 0;
1491 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
1492 subs->cur_audiofmt->iface,
1493 subs->cur_audiofmt->altsetting);
1494 return 0;
1495 }
1496
1497 return -EINVAL;
1498}
1499
1500static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1501 int cmd)
1502{
1503 int err;
1504 struct snd_usb_substream *subs = substream->runtime->private_data;
1505
1506 switch (cmd) {
1507 case SNDRV_PCM_TRIGGER_START:
1508 err = start_endpoints(subs);
1509 if (err < 0)
1510 return err;
1511 fallthrough;
1512 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1513 snd_usb_endpoint_set_callback(subs->data_endpoint,
1514 NULL, retire_capture_urb,
1515 subs);
1516 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1517 subs->running = 1;
1518 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
1519 subs->cur_audiofmt->iface,
1520 subs->cur_audiofmt->altsetting);
1521 return 0;
1522 case SNDRV_PCM_TRIGGER_SUSPEND:
1523 case SNDRV_PCM_TRIGGER_STOP:
1524 stop_endpoints(subs);
1525 fallthrough;
1526 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1527 snd_usb_endpoint_set_callback(subs->data_endpoint,
1528 NULL, NULL, NULL);
1529 subs->running = 0;
1530 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
1531 subs->cur_audiofmt->iface,
1532 subs->cur_audiofmt->altsetting);
1533 return 0;
1534 }
1535
1536 return -EINVAL;
1537}
1538
1539static const struct snd_pcm_ops snd_usb_playback_ops = {
1540 .open = snd_usb_pcm_open,
1541 .close = snd_usb_pcm_close,
1542 .hw_params = snd_usb_hw_params,
1543 .hw_free = snd_usb_hw_free,
1544 .prepare = snd_usb_pcm_prepare,
1545 .trigger = snd_usb_substream_playback_trigger,
1546 .sync_stop = snd_usb_pcm_sync_stop,
1547 .pointer = snd_usb_pcm_pointer,
1548};
1549
1550static const struct snd_pcm_ops snd_usb_capture_ops = {
1551 .open = snd_usb_pcm_open,
1552 .close = snd_usb_pcm_close,
1553 .hw_params = snd_usb_hw_params,
1554 .hw_free = snd_usb_hw_free,
1555 .prepare = snd_usb_pcm_prepare,
1556 .trigger = snd_usb_substream_capture_trigger,
1557 .sync_stop = snd_usb_pcm_sync_stop,
1558 .pointer = snd_usb_pcm_pointer,
1559};
1560
1561void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1562{
1563 const struct snd_pcm_ops *ops;
1564
1565 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1566 &snd_usb_playback_ops : &snd_usb_capture_ops;
1567 snd_pcm_set_ops(pcm, stream, ops);
1568}
1569
1570void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1571{
1572 struct snd_pcm *pcm = subs->stream->pcm;
1573 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1574 struct device *dev = subs->dev->bus->sysdev;
1575
1576 if (snd_usb_use_vmalloc)
1577 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1578 NULL, 0, 0);
1579 else
1580 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1581 dev, 64*1024, 512*1024);
1582}