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ALSA: asihpi: update to HPI version 4.14
[deliverable/linux.git] / sound / usb / pcm.c
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 */
43 snd_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 */
77 static 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 */
96 static 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
153 static 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
177 static 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 */
201 int 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
219 static 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
271 static 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
285 static 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
314 static 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
364 add_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
376 static 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 */
450 static 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
486 err = snd_usb_select_mode_quirk(subs, fmt);
487 if (err < 0)
488 return -EIO;
489
490 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
491 if (err < 0) {
492 dev_err(&dev->dev,
493 "%d:%d: usb_set_interface failed (%d)\n",
494 fmt->iface, fmt->altsetting, err);
495 return -EIO;
496 }
497 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
498 fmt->iface, fmt->altsetting);
499 subs->interface = fmt->iface;
500 subs->altset_idx = fmt->altset_idx;
501
502 snd_usb_set_interface_quirk(dev);
503 }
504
505 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
506 alts, fmt->endpoint, subs->direction,
507 SND_USB_ENDPOINT_TYPE_DATA);
508
509 if (!subs->data_endpoint)
510 return -EINVAL;
511
512 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
513 if (err < 0)
514 return err;
515
516 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
517 if (err < 0)
518 return err;
519
520 subs->cur_audiofmt = fmt;
521
522 snd_usb_set_format_quirk(subs, fmt);
523
524 return 0;
525 }
526
527 /*
528 * Return the score of matching two audioformats.
529 * Veto the audioformat if:
530 * - It has no channels for some reason.
531 * - Requested PCM format is not supported.
532 * - Requested sample rate is not supported.
533 */
534 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
535 struct audioformat *fp,
536 struct audioformat *match, int rate,
537 snd_pcm_format_t pcm_format)
538 {
539 int i;
540 int score = 0;
541
542 if (fp->channels < 1) {
543 dev_dbg(&subs->dev->dev,
544 "%s: (fmt @%p) no channels\n", __func__, fp);
545 return 0;
546 }
547
548 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
549 dev_dbg(&subs->dev->dev,
550 "%s: (fmt @%p) no match for format %d\n", __func__,
551 fp, pcm_format);
552 return 0;
553 }
554
555 for (i = 0; i < fp->nr_rates; i++) {
556 if (fp->rate_table[i] == rate) {
557 score++;
558 break;
559 }
560 }
561 if (!score) {
562 dev_dbg(&subs->dev->dev,
563 "%s: (fmt @%p) no match for rate %d\n", __func__,
564 fp, rate);
565 return 0;
566 }
567
568 if (fp->channels == match->channels)
569 score++;
570
571 dev_dbg(&subs->dev->dev,
572 "%s: (fmt @%p) score %d\n", __func__, fp, score);
573
574 return score;
575 }
576
577 /*
578 * Configure the sync ep using the rate and pcm format of the data ep.
579 */
580 static int configure_sync_endpoint(struct snd_usb_substream *subs)
581 {
582 int ret;
583 struct audioformat *fp;
584 struct audioformat *sync_fp = NULL;
585 int cur_score = 0;
586 int sync_period_bytes = subs->period_bytes;
587 struct snd_usb_substream *sync_subs =
588 &subs->stream->substream[subs->direction ^ 1];
589
590 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
591 !subs->stream)
592 return snd_usb_endpoint_set_params(subs->sync_endpoint,
593 subs->pcm_format,
594 subs->channels,
595 subs->period_bytes,
596 0, 0,
597 subs->cur_rate,
598 subs->cur_audiofmt,
599 NULL);
600
601 /* Try to find the best matching audioformat. */
602 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
603 int score = match_endpoint_audioformats(subs,
604 fp, subs->cur_audiofmt,
605 subs->cur_rate, subs->pcm_format);
606
607 if (score > cur_score) {
608 sync_fp = fp;
609 cur_score = score;
610 }
611 }
612
613 if (unlikely(sync_fp == NULL)) {
614 dev_err(&subs->dev->dev,
615 "%s: no valid audioformat for sync ep %x found\n",
616 __func__, sync_subs->ep_num);
617 return -EINVAL;
618 }
619
620 /*
621 * Recalculate the period bytes if channel number differ between
622 * data and sync ep audioformat.
623 */
624 if (sync_fp->channels != subs->channels) {
625 sync_period_bytes = (subs->period_bytes / subs->channels) *
626 sync_fp->channels;
627 dev_dbg(&subs->dev->dev,
628 "%s: adjusted sync ep period bytes (%d -> %d)\n",
629 __func__, subs->period_bytes, sync_period_bytes);
630 }
631
632 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
633 subs->pcm_format,
634 sync_fp->channels,
635 sync_period_bytes,
636 0, 0,
637 subs->cur_rate,
638 sync_fp,
639 NULL);
640
641 return ret;
642 }
643
644 /*
645 * configure endpoint params
646 *
647 * called during initial setup and upon resume
648 */
649 static int configure_endpoint(struct snd_usb_substream *subs)
650 {
651 int ret;
652
653 /* format changed */
654 stop_endpoints(subs, true);
655 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
656 subs->pcm_format,
657 subs->channels,
658 subs->period_bytes,
659 subs->period_frames,
660 subs->buffer_periods,
661 subs->cur_rate,
662 subs->cur_audiofmt,
663 subs->sync_endpoint);
664 if (ret < 0)
665 return ret;
666
667 if (subs->sync_endpoint)
668 ret = configure_sync_endpoint(subs);
669
670 return ret;
671 }
672
673 /*
674 * hw_params callback
675 *
676 * allocate a buffer and set the given audio format.
677 *
678 * so far we use a physically linear buffer although packetize transfer
679 * doesn't need a continuous area.
680 * if sg buffer is supported on the later version of alsa, we'll follow
681 * that.
682 */
683 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
684 struct snd_pcm_hw_params *hw_params)
685 {
686 struct snd_usb_substream *subs = substream->runtime->private_data;
687 struct audioformat *fmt;
688 int ret;
689
690 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
691 params_buffer_bytes(hw_params));
692 if (ret < 0)
693 return ret;
694
695 subs->pcm_format = params_format(hw_params);
696 subs->period_bytes = params_period_bytes(hw_params);
697 subs->period_frames = params_period_size(hw_params);
698 subs->buffer_periods = params_periods(hw_params);
699 subs->channels = params_channels(hw_params);
700 subs->cur_rate = params_rate(hw_params);
701
702 fmt = find_format(subs);
703 if (!fmt) {
704 dev_dbg(&subs->dev->dev,
705 "cannot set format: format = %#x, rate = %d, channels = %d\n",
706 subs->pcm_format, subs->cur_rate, subs->channels);
707 return -EINVAL;
708 }
709
710 down_read(&subs->stream->chip->shutdown_rwsem);
711 if (subs->stream->chip->shutdown)
712 ret = -ENODEV;
713 else
714 ret = set_format(subs, fmt);
715 up_read(&subs->stream->chip->shutdown_rwsem);
716 if (ret < 0)
717 return ret;
718
719 subs->interface = fmt->iface;
720 subs->altset_idx = fmt->altset_idx;
721 subs->need_setup_ep = true;
722
723 return 0;
724 }
725
726 /*
727 * hw_free callback
728 *
729 * reset the audio format and release the buffer
730 */
731 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
732 {
733 struct snd_usb_substream *subs = substream->runtime->private_data;
734
735 subs->cur_audiofmt = NULL;
736 subs->cur_rate = 0;
737 subs->period_bytes = 0;
738 down_read(&subs->stream->chip->shutdown_rwsem);
739 if (!subs->stream->chip->shutdown) {
740 stop_endpoints(subs, true);
741 snd_usb_endpoint_deactivate(subs->sync_endpoint);
742 snd_usb_endpoint_deactivate(subs->data_endpoint);
743 }
744 up_read(&subs->stream->chip->shutdown_rwsem);
745 return snd_pcm_lib_free_vmalloc_buffer(substream);
746 }
747
748 /*
749 * prepare callback
750 *
751 * only a few subtle things...
752 */
753 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
754 {
755 struct snd_pcm_runtime *runtime = substream->runtime;
756 struct snd_usb_substream *subs = runtime->private_data;
757 struct usb_host_interface *alts;
758 struct usb_interface *iface;
759 int ret;
760
761 if (! subs->cur_audiofmt) {
762 dev_err(&subs->dev->dev, "no format is specified!\n");
763 return -ENXIO;
764 }
765
766 down_read(&subs->stream->chip->shutdown_rwsem);
767 if (subs->stream->chip->shutdown) {
768 ret = -ENODEV;
769 goto unlock;
770 }
771 if (snd_BUG_ON(!subs->data_endpoint)) {
772 ret = -EIO;
773 goto unlock;
774 }
775
776 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
777 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
778
779 ret = set_format(subs, subs->cur_audiofmt);
780 if (ret < 0)
781 goto unlock;
782
783 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
784 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
785 ret = snd_usb_init_sample_rate(subs->stream->chip,
786 subs->cur_audiofmt->iface,
787 alts,
788 subs->cur_audiofmt,
789 subs->cur_rate);
790 if (ret < 0)
791 goto unlock;
792
793 if (subs->need_setup_ep) {
794 ret = configure_endpoint(subs);
795 if (ret < 0)
796 goto unlock;
797 subs->need_setup_ep = false;
798 }
799
800 /* some unit conversions in runtime */
801 subs->data_endpoint->maxframesize =
802 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
803 subs->data_endpoint->curframesize =
804 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
805
806 /* reset the pointer */
807 subs->hwptr_done = 0;
808 subs->transfer_done = 0;
809 subs->last_delay = 0;
810 subs->last_frame_number = 0;
811 runtime->delay = 0;
812
813 /* for playback, submit the URBs now; otherwise, the first hwptr_done
814 * updates for all URBs would happen at the same time when starting */
815 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
816 ret = start_endpoints(subs, true);
817
818 unlock:
819 up_read(&subs->stream->chip->shutdown_rwsem);
820 return ret;
821 }
822
823 static struct snd_pcm_hardware snd_usb_hardware =
824 {
825 .info = SNDRV_PCM_INFO_MMAP |
826 SNDRV_PCM_INFO_MMAP_VALID |
827 SNDRV_PCM_INFO_BATCH |
828 SNDRV_PCM_INFO_INTERLEAVED |
829 SNDRV_PCM_INFO_BLOCK_TRANSFER |
830 SNDRV_PCM_INFO_PAUSE,
831 .buffer_bytes_max = 1024 * 1024,
832 .period_bytes_min = 64,
833 .period_bytes_max = 512 * 1024,
834 .periods_min = 2,
835 .periods_max = 1024,
836 };
837
838 static int hw_check_valid_format(struct snd_usb_substream *subs,
839 struct snd_pcm_hw_params *params,
840 struct audioformat *fp)
841 {
842 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
843 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
844 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
845 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
846 struct snd_mask check_fmts;
847 unsigned int ptime;
848
849 /* check the format */
850 snd_mask_none(&check_fmts);
851 check_fmts.bits[0] = (u32)fp->formats;
852 check_fmts.bits[1] = (u32)(fp->formats >> 32);
853 snd_mask_intersect(&check_fmts, fmts);
854 if (snd_mask_empty(&check_fmts)) {
855 hwc_debug(" > check: no supported format %d\n", fp->format);
856 return 0;
857 }
858 /* check the channels */
859 if (fp->channels < ct->min || fp->channels > ct->max) {
860 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
861 return 0;
862 }
863 /* check the rate is within the range */
864 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
865 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
866 return 0;
867 }
868 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
869 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
870 return 0;
871 }
872 /* check whether the period time is >= the data packet interval */
873 if (subs->speed != USB_SPEED_FULL) {
874 ptime = 125 * (1 << fp->datainterval);
875 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
876 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
877 return 0;
878 }
879 }
880 return 1;
881 }
882
883 static int hw_rule_rate(struct snd_pcm_hw_params *params,
884 struct snd_pcm_hw_rule *rule)
885 {
886 struct snd_usb_substream *subs = rule->private;
887 struct audioformat *fp;
888 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
889 unsigned int rmin, rmax;
890 int changed;
891
892 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
893 changed = 0;
894 rmin = rmax = 0;
895 list_for_each_entry(fp, &subs->fmt_list, list) {
896 if (!hw_check_valid_format(subs, params, fp))
897 continue;
898 if (changed++) {
899 if (rmin > fp->rate_min)
900 rmin = fp->rate_min;
901 if (rmax < fp->rate_max)
902 rmax = fp->rate_max;
903 } else {
904 rmin = fp->rate_min;
905 rmax = fp->rate_max;
906 }
907 }
908
909 if (!changed) {
910 hwc_debug(" --> get empty\n");
911 it->empty = 1;
912 return -EINVAL;
913 }
914
915 changed = 0;
916 if (it->min < rmin) {
917 it->min = rmin;
918 it->openmin = 0;
919 changed = 1;
920 }
921 if (it->max > rmax) {
922 it->max = rmax;
923 it->openmax = 0;
924 changed = 1;
925 }
926 if (snd_interval_checkempty(it)) {
927 it->empty = 1;
928 return -EINVAL;
929 }
930 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
931 return changed;
932 }
933
934
935 static int hw_rule_channels(struct snd_pcm_hw_params *params,
936 struct snd_pcm_hw_rule *rule)
937 {
938 struct snd_usb_substream *subs = rule->private;
939 struct audioformat *fp;
940 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
941 unsigned int rmin, rmax;
942 int changed;
943
944 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
945 changed = 0;
946 rmin = rmax = 0;
947 list_for_each_entry(fp, &subs->fmt_list, list) {
948 if (!hw_check_valid_format(subs, params, fp))
949 continue;
950 if (changed++) {
951 if (rmin > fp->channels)
952 rmin = fp->channels;
953 if (rmax < fp->channels)
954 rmax = fp->channels;
955 } else {
956 rmin = fp->channels;
957 rmax = fp->channels;
958 }
959 }
960
961 if (!changed) {
962 hwc_debug(" --> get empty\n");
963 it->empty = 1;
964 return -EINVAL;
965 }
966
967 changed = 0;
968 if (it->min < rmin) {
969 it->min = rmin;
970 it->openmin = 0;
971 changed = 1;
972 }
973 if (it->max > rmax) {
974 it->max = rmax;
975 it->openmax = 0;
976 changed = 1;
977 }
978 if (snd_interval_checkempty(it)) {
979 it->empty = 1;
980 return -EINVAL;
981 }
982 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
983 return changed;
984 }
985
986 static int hw_rule_format(struct snd_pcm_hw_params *params,
987 struct snd_pcm_hw_rule *rule)
988 {
989 struct snd_usb_substream *subs = rule->private;
990 struct audioformat *fp;
991 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
992 u64 fbits;
993 u32 oldbits[2];
994 int changed;
995
996 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
997 fbits = 0;
998 list_for_each_entry(fp, &subs->fmt_list, list) {
999 if (!hw_check_valid_format(subs, params, fp))
1000 continue;
1001 fbits |= fp->formats;
1002 }
1003
1004 oldbits[0] = fmt->bits[0];
1005 oldbits[1] = fmt->bits[1];
1006 fmt->bits[0] &= (u32)fbits;
1007 fmt->bits[1] &= (u32)(fbits >> 32);
1008 if (!fmt->bits[0] && !fmt->bits[1]) {
1009 hwc_debug(" --> get empty\n");
1010 return -EINVAL;
1011 }
1012 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1013 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1014 return changed;
1015 }
1016
1017 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1018 struct snd_pcm_hw_rule *rule)
1019 {
1020 struct snd_usb_substream *subs = rule->private;
1021 struct audioformat *fp;
1022 struct snd_interval *it;
1023 unsigned char min_datainterval;
1024 unsigned int pmin;
1025 int changed;
1026
1027 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1028 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1029 min_datainterval = 0xff;
1030 list_for_each_entry(fp, &subs->fmt_list, list) {
1031 if (!hw_check_valid_format(subs, params, fp))
1032 continue;
1033 min_datainterval = min(min_datainterval, fp->datainterval);
1034 }
1035 if (min_datainterval == 0xff) {
1036 hwc_debug(" --> get empty\n");
1037 it->empty = 1;
1038 return -EINVAL;
1039 }
1040 pmin = 125 * (1 << min_datainterval);
1041 changed = 0;
1042 if (it->min < pmin) {
1043 it->min = pmin;
1044 it->openmin = 0;
1045 changed = 1;
1046 }
1047 if (snd_interval_checkempty(it)) {
1048 it->empty = 1;
1049 return -EINVAL;
1050 }
1051 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1052 return changed;
1053 }
1054
1055 /*
1056 * If the device supports unusual bit rates, does the request meet these?
1057 */
1058 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1059 struct snd_usb_substream *subs)
1060 {
1061 struct audioformat *fp;
1062 int *rate_list;
1063 int count = 0, needs_knot = 0;
1064 int err;
1065
1066 kfree(subs->rate_list.list);
1067 subs->rate_list.list = NULL;
1068
1069 list_for_each_entry(fp, &subs->fmt_list, list) {
1070 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1071 return 0;
1072 count += fp->nr_rates;
1073 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1074 needs_knot = 1;
1075 }
1076 if (!needs_knot)
1077 return 0;
1078
1079 subs->rate_list.list = rate_list =
1080 kmalloc(sizeof(int) * count, GFP_KERNEL);
1081 if (!subs->rate_list.list)
1082 return -ENOMEM;
1083 subs->rate_list.count = count;
1084 subs->rate_list.mask = 0;
1085 count = 0;
1086 list_for_each_entry(fp, &subs->fmt_list, list) {
1087 int i;
1088 for (i = 0; i < fp->nr_rates; i++)
1089 rate_list[count++] = fp->rate_table[i];
1090 }
1091 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1092 &subs->rate_list);
1093 if (err < 0)
1094 return err;
1095
1096 return 0;
1097 }
1098
1099
1100 /*
1101 * set up the runtime hardware information.
1102 */
1103
1104 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1105 {
1106 struct audioformat *fp;
1107 unsigned int pt, ptmin;
1108 int param_period_time_if_needed;
1109 int err;
1110
1111 runtime->hw.formats = subs->formats;
1112
1113 runtime->hw.rate_min = 0x7fffffff;
1114 runtime->hw.rate_max = 0;
1115 runtime->hw.channels_min = 256;
1116 runtime->hw.channels_max = 0;
1117 runtime->hw.rates = 0;
1118 ptmin = UINT_MAX;
1119 /* check min/max rates and channels */
1120 list_for_each_entry(fp, &subs->fmt_list, list) {
1121 runtime->hw.rates |= fp->rates;
1122 if (runtime->hw.rate_min > fp->rate_min)
1123 runtime->hw.rate_min = fp->rate_min;
1124 if (runtime->hw.rate_max < fp->rate_max)
1125 runtime->hw.rate_max = fp->rate_max;
1126 if (runtime->hw.channels_min > fp->channels)
1127 runtime->hw.channels_min = fp->channels;
1128 if (runtime->hw.channels_max < fp->channels)
1129 runtime->hw.channels_max = fp->channels;
1130 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1131 /* FIXME: there might be more than one audio formats... */
1132 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1133 fp->frame_size;
1134 }
1135 pt = 125 * (1 << fp->datainterval);
1136 ptmin = min(ptmin, pt);
1137 }
1138 err = snd_usb_autoresume(subs->stream->chip);
1139 if (err < 0)
1140 return err;
1141
1142 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1143 if (subs->speed == USB_SPEED_FULL)
1144 /* full speed devices have fixed data packet interval */
1145 ptmin = 1000;
1146 if (ptmin == 1000)
1147 /* if period time doesn't go below 1 ms, no rules needed */
1148 param_period_time_if_needed = -1;
1149 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1150 ptmin, UINT_MAX);
1151
1152 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1153 hw_rule_rate, subs,
1154 SNDRV_PCM_HW_PARAM_FORMAT,
1155 SNDRV_PCM_HW_PARAM_CHANNELS,
1156 param_period_time_if_needed,
1157 -1)) < 0)
1158 goto rep_err;
1159 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1160 hw_rule_channels, subs,
1161 SNDRV_PCM_HW_PARAM_FORMAT,
1162 SNDRV_PCM_HW_PARAM_RATE,
1163 param_period_time_if_needed,
1164 -1)) < 0)
1165 goto rep_err;
1166 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1167 hw_rule_format, subs,
1168 SNDRV_PCM_HW_PARAM_RATE,
1169 SNDRV_PCM_HW_PARAM_CHANNELS,
1170 param_period_time_if_needed,
1171 -1)) < 0)
1172 goto rep_err;
1173 if (param_period_time_if_needed >= 0) {
1174 err = snd_pcm_hw_rule_add(runtime, 0,
1175 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1176 hw_rule_period_time, subs,
1177 SNDRV_PCM_HW_PARAM_FORMAT,
1178 SNDRV_PCM_HW_PARAM_CHANNELS,
1179 SNDRV_PCM_HW_PARAM_RATE,
1180 -1);
1181 if (err < 0)
1182 goto rep_err;
1183 }
1184 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1185 goto rep_err;
1186 return 0;
1187
1188 rep_err:
1189 snd_usb_autosuspend(subs->stream->chip);
1190 return err;
1191 }
1192
1193 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1194 {
1195 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1196 struct snd_pcm_runtime *runtime = substream->runtime;
1197 struct snd_usb_substream *subs = &as->substream[direction];
1198
1199 subs->interface = -1;
1200 subs->altset_idx = 0;
1201 runtime->hw = snd_usb_hardware;
1202 runtime->private_data = subs;
1203 subs->pcm_substream = substream;
1204 /* runtime PM is also done there */
1205
1206 /* initialize DSD/DOP context */
1207 subs->dsd_dop.byte_idx = 0;
1208 subs->dsd_dop.channel = 0;
1209 subs->dsd_dop.marker = 1;
1210
1211 return setup_hw_info(runtime, subs);
1212 }
1213
1214 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1215 {
1216 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1217 struct snd_usb_substream *subs = &as->substream[direction];
1218
1219 stop_endpoints(subs, true);
1220
1221 if (!as->chip->shutdown && subs->interface >= 0) {
1222 usb_set_interface(subs->dev, subs->interface, 0);
1223 subs->interface = -1;
1224 }
1225
1226 subs->pcm_substream = NULL;
1227 snd_usb_autosuspend(subs->stream->chip);
1228
1229 return 0;
1230 }
1231
1232 /* Since a URB can handle only a single linear buffer, we must use double
1233 * buffering when the data to be transferred overflows the buffer boundary.
1234 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1235 * for all URBs.
1236 */
1237 static void retire_capture_urb(struct snd_usb_substream *subs,
1238 struct urb *urb)
1239 {
1240 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1241 unsigned int stride, frames, bytes, oldptr;
1242 int i, period_elapsed = 0;
1243 unsigned long flags;
1244 unsigned char *cp;
1245 int current_frame_number;
1246
1247 /* read frame number here, update pointer in critical section */
1248 current_frame_number = usb_get_current_frame_number(subs->dev);
1249
1250 stride = runtime->frame_bits >> 3;
1251
1252 for (i = 0; i < urb->number_of_packets; i++) {
1253 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1254 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1255 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1256 i, urb->iso_frame_desc[i].status);
1257 // continue;
1258 }
1259 bytes = urb->iso_frame_desc[i].actual_length;
1260 frames = bytes / stride;
1261 if (!subs->txfr_quirk)
1262 bytes = frames * stride;
1263 if (bytes % (runtime->sample_bits >> 3) != 0) {
1264 int oldbytes = bytes;
1265 bytes = frames * stride;
1266 dev_warn(&subs->dev->dev,
1267 "Corrected urb data len. %d->%d\n",
1268 oldbytes, bytes);
1269 }
1270 /* update the current pointer */
1271 spin_lock_irqsave(&subs->lock, flags);
1272 oldptr = subs->hwptr_done;
1273 subs->hwptr_done += bytes;
1274 if (subs->hwptr_done >= runtime->buffer_size * stride)
1275 subs->hwptr_done -= runtime->buffer_size * stride;
1276 frames = (bytes + (oldptr % stride)) / stride;
1277 subs->transfer_done += frames;
1278 if (subs->transfer_done >= runtime->period_size) {
1279 subs->transfer_done -= runtime->period_size;
1280 period_elapsed = 1;
1281 }
1282 /* capture delay is by construction limited to one URB,
1283 * reset delays here
1284 */
1285 runtime->delay = subs->last_delay = 0;
1286
1287 /* realign last_frame_number */
1288 subs->last_frame_number = current_frame_number;
1289 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1290
1291 spin_unlock_irqrestore(&subs->lock, flags);
1292 /* copy a data chunk */
1293 if (oldptr + bytes > runtime->buffer_size * stride) {
1294 unsigned int bytes1 =
1295 runtime->buffer_size * stride - oldptr;
1296 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1297 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1298 } else {
1299 memcpy(runtime->dma_area + oldptr, cp, bytes);
1300 }
1301 }
1302
1303 if (period_elapsed)
1304 snd_pcm_period_elapsed(subs->pcm_substream);
1305 }
1306
1307 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1308 struct urb *urb, unsigned int bytes)
1309 {
1310 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1311 unsigned int stride = runtime->frame_bits >> 3;
1312 unsigned int dst_idx = 0;
1313 unsigned int src_idx = subs->hwptr_done;
1314 unsigned int wrap = runtime->buffer_size * stride;
1315 u8 *dst = urb->transfer_buffer;
1316 u8 *src = runtime->dma_area;
1317 u8 marker[] = { 0x05, 0xfa };
1318
1319 /*
1320 * The DSP DOP format defines a way to transport DSD samples over
1321 * normal PCM data endpoints. It requires stuffing of marker bytes
1322 * (0x05 and 0xfa, alternating per sample frame), and then expects
1323 * 2 additional bytes of actual payload. The whole frame is stored
1324 * LSB.
1325 *
1326 * Hence, for a stereo transport, the buffer layout looks like this,
1327 * where L refers to left channel samples and R to right.
1328 *
1329 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1330 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1331 * .....
1332 *
1333 */
1334
1335 while (bytes--) {
1336 if (++subs->dsd_dop.byte_idx == 3) {
1337 /* frame boundary? */
1338 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1339 src_idx += 2;
1340 subs->dsd_dop.byte_idx = 0;
1341
1342 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1343 /* alternate the marker */
1344 subs->dsd_dop.marker++;
1345 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1346 subs->dsd_dop.channel = 0;
1347 }
1348 } else {
1349 /* stuff the DSD payload */
1350 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1351
1352 if (subs->cur_audiofmt->dsd_bitrev)
1353 dst[dst_idx++] = bitrev8(src[idx]);
1354 else
1355 dst[dst_idx++] = src[idx];
1356
1357 subs->hwptr_done++;
1358 }
1359 }
1360 }
1361
1362 static void prepare_playback_urb(struct snd_usb_substream *subs,
1363 struct urb *urb)
1364 {
1365 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1366 struct snd_usb_endpoint *ep = subs->data_endpoint;
1367 struct snd_urb_ctx *ctx = urb->context;
1368 unsigned int counts, frames, bytes;
1369 int i, stride, period_elapsed = 0;
1370 unsigned long flags;
1371
1372 stride = runtime->frame_bits >> 3;
1373
1374 frames = 0;
1375 urb->number_of_packets = 0;
1376 spin_lock_irqsave(&subs->lock, flags);
1377 subs->frame_limit += ep->max_urb_frames;
1378 for (i = 0; i < ctx->packets; i++) {
1379 if (ctx->packet_size[i])
1380 counts = ctx->packet_size[i];
1381 else
1382 counts = snd_usb_endpoint_next_packet_size(ep);
1383
1384 /* set up descriptor */
1385 urb->iso_frame_desc[i].offset = frames * ep->stride;
1386 urb->iso_frame_desc[i].length = counts * ep->stride;
1387 frames += counts;
1388 urb->number_of_packets++;
1389 subs->transfer_done += counts;
1390 if (subs->transfer_done >= runtime->period_size) {
1391 subs->transfer_done -= runtime->period_size;
1392 subs->frame_limit = 0;
1393 period_elapsed = 1;
1394 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1395 if (subs->transfer_done > 0) {
1396 /* FIXME: fill-max mode is not
1397 * supported yet */
1398 frames -= subs->transfer_done;
1399 counts -= subs->transfer_done;
1400 urb->iso_frame_desc[i].length =
1401 counts * ep->stride;
1402 subs->transfer_done = 0;
1403 }
1404 i++;
1405 if (i < ctx->packets) {
1406 /* add a transfer delimiter */
1407 urb->iso_frame_desc[i].offset =
1408 frames * ep->stride;
1409 urb->iso_frame_desc[i].length = 0;
1410 urb->number_of_packets++;
1411 }
1412 break;
1413 }
1414 }
1415 /* finish at the period boundary or after enough frames */
1416 if ((period_elapsed ||
1417 subs->transfer_done >= subs->frame_limit) &&
1418 !snd_usb_endpoint_implicit_feedback_sink(ep))
1419 break;
1420 }
1421 bytes = frames * ep->stride;
1422
1423 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1424 subs->cur_audiofmt->dsd_dop)) {
1425 fill_playback_urb_dsd_dop(subs, urb, bytes);
1426 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1427 subs->cur_audiofmt->dsd_bitrev)) {
1428 /* bit-reverse the bytes */
1429 u8 *buf = urb->transfer_buffer;
1430 for (i = 0; i < bytes; i++) {
1431 int idx = (subs->hwptr_done + i)
1432 % (runtime->buffer_size * stride);
1433 buf[i] = bitrev8(runtime->dma_area[idx]);
1434 }
1435
1436 subs->hwptr_done += bytes;
1437 } else {
1438 /* usual PCM */
1439 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1440 /* err, the transferred area goes over buffer boundary. */
1441 unsigned int bytes1 =
1442 runtime->buffer_size * stride - subs->hwptr_done;
1443 memcpy(urb->transfer_buffer,
1444 runtime->dma_area + subs->hwptr_done, bytes1);
1445 memcpy(urb->transfer_buffer + bytes1,
1446 runtime->dma_area, bytes - bytes1);
1447 } else {
1448 memcpy(urb->transfer_buffer,
1449 runtime->dma_area + subs->hwptr_done, bytes);
1450 }
1451
1452 subs->hwptr_done += bytes;
1453 }
1454
1455 if (subs->hwptr_done >= runtime->buffer_size * stride)
1456 subs->hwptr_done -= runtime->buffer_size * stride;
1457
1458 /* update delay with exact number of samples queued */
1459 runtime->delay = subs->last_delay;
1460 runtime->delay += frames;
1461 subs->last_delay = runtime->delay;
1462
1463 /* realign last_frame_number */
1464 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1465 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1466
1467 spin_unlock_irqrestore(&subs->lock, flags);
1468 urb->transfer_buffer_length = bytes;
1469 if (period_elapsed)
1470 snd_pcm_period_elapsed(subs->pcm_substream);
1471 }
1472
1473 /*
1474 * process after playback data complete
1475 * - decrease the delay count again
1476 */
1477 static void retire_playback_urb(struct snd_usb_substream *subs,
1478 struct urb *urb)
1479 {
1480 unsigned long flags;
1481 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1482 struct snd_usb_endpoint *ep = subs->data_endpoint;
1483 int processed = urb->transfer_buffer_length / ep->stride;
1484 int est_delay;
1485
1486 /* ignore the delay accounting when procssed=0 is given, i.e.
1487 * silent payloads are procssed before handling the actual data
1488 */
1489 if (!processed)
1490 return;
1491
1492 spin_lock_irqsave(&subs->lock, flags);
1493 if (!subs->last_delay)
1494 goto out; /* short path */
1495
1496 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1497 /* update delay with exact number of samples played */
1498 if (processed > subs->last_delay)
1499 subs->last_delay = 0;
1500 else
1501 subs->last_delay -= processed;
1502 runtime->delay = subs->last_delay;
1503
1504 /*
1505 * Report when delay estimate is off by more than 2ms.
1506 * The error should be lower than 2ms since the estimate relies
1507 * on two reads of a counter updated every ms.
1508 */
1509 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1510 dev_dbg_ratelimited(&subs->dev->dev,
1511 "delay: estimated %d, actual %d\n",
1512 est_delay, subs->last_delay);
1513
1514 if (!subs->running) {
1515 /* update last_frame_number for delay counting here since
1516 * prepare_playback_urb won't be called during pause
1517 */
1518 subs->last_frame_number =
1519 usb_get_current_frame_number(subs->dev) & 0xff;
1520 }
1521
1522 out:
1523 spin_unlock_irqrestore(&subs->lock, flags);
1524 }
1525
1526 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1527 {
1528 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1529 }
1530
1531 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1532 {
1533 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1534 }
1535
1536 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1537 {
1538 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1539 }
1540
1541 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1542 {
1543 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1544 }
1545
1546 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1547 int cmd)
1548 {
1549 struct snd_usb_substream *subs = substream->runtime->private_data;
1550
1551 switch (cmd) {
1552 case SNDRV_PCM_TRIGGER_START:
1553 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1554 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1555 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1556 subs->running = 1;
1557 return 0;
1558 case SNDRV_PCM_TRIGGER_STOP:
1559 stop_endpoints(subs, false);
1560 subs->running = 0;
1561 return 0;
1562 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1563 subs->data_endpoint->prepare_data_urb = NULL;
1564 /* keep retire_data_urb for delay calculation */
1565 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1566 subs->running = 0;
1567 return 0;
1568 }
1569
1570 return -EINVAL;
1571 }
1572
1573 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1574 int cmd)
1575 {
1576 int err;
1577 struct snd_usb_substream *subs = substream->runtime->private_data;
1578
1579 switch (cmd) {
1580 case SNDRV_PCM_TRIGGER_START:
1581 err = start_endpoints(subs, false);
1582 if (err < 0)
1583 return err;
1584
1585 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1586 subs->running = 1;
1587 return 0;
1588 case SNDRV_PCM_TRIGGER_STOP:
1589 stop_endpoints(subs, false);
1590 subs->running = 0;
1591 return 0;
1592 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1593 subs->data_endpoint->retire_data_urb = NULL;
1594 subs->running = 0;
1595 return 0;
1596 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1597 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1598 subs->running = 1;
1599 return 0;
1600 }
1601
1602 return -EINVAL;
1603 }
1604
1605 static struct snd_pcm_ops snd_usb_playback_ops = {
1606 .open = snd_usb_playback_open,
1607 .close = snd_usb_playback_close,
1608 .ioctl = snd_pcm_lib_ioctl,
1609 .hw_params = snd_usb_hw_params,
1610 .hw_free = snd_usb_hw_free,
1611 .prepare = snd_usb_pcm_prepare,
1612 .trigger = snd_usb_substream_playback_trigger,
1613 .pointer = snd_usb_pcm_pointer,
1614 .page = snd_pcm_lib_get_vmalloc_page,
1615 .mmap = snd_pcm_lib_mmap_vmalloc,
1616 };
1617
1618 static struct snd_pcm_ops snd_usb_capture_ops = {
1619 .open = snd_usb_capture_open,
1620 .close = snd_usb_capture_close,
1621 .ioctl = snd_pcm_lib_ioctl,
1622 .hw_params = snd_usb_hw_params,
1623 .hw_free = snd_usb_hw_free,
1624 .prepare = snd_usb_pcm_prepare,
1625 .trigger = snd_usb_substream_capture_trigger,
1626 .pointer = snd_usb_pcm_pointer,
1627 .page = snd_pcm_lib_get_vmalloc_page,
1628 .mmap = snd_pcm_lib_mmap_vmalloc,
1629 };
1630
1631 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1632 {
1633 snd_pcm_set_ops(pcm, stream,
1634 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1635 &snd_usb_playback_ops : &snd_usb_capture_ops);
1636 }
Linux kernel - Deliverables
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