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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 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 */
529 static 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 */
575 static 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 */
644 static 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 */
678 static 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 */
726 static 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 */
748 static 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
818 static 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
833 static 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
878 static 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
930 static 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
981 static 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
1012 static 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 */
1053 static 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
1099 static 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
1183 rep_err:
1184 snd_usb_autosuspend(subs->stream->chip);
1185 return err;
1186 }
1187
1188 static 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
1209 static 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 */
1232 static 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
1302 static 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
1357 static 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 */
1472 static 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 (printk_ratelimit() &&
1505 abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1506 dev_dbg(&subs->dev->dev,
1507 "delay: estimated %d, actual %d\n",
1508 est_delay, subs->last_delay);
1509
1510 if (!subs->running) {
1511 /* update last_frame_number for delay counting here since
1512 * prepare_playback_urb won't be called during pause
1513 */
1514 subs->last_frame_number =
1515 usb_get_current_frame_number(subs->dev) & 0xff;
1516 }
1517
1518 out:
1519 spin_unlock_irqrestore(&subs->lock, flags);
1520 }
1521
1522 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1523 {
1524 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1525 }
1526
1527 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1528 {
1529 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1530 }
1531
1532 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1533 {
1534 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1535 }
1536
1537 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1538 {
1539 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1540 }
1541
1542 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1543 int cmd)
1544 {
1545 struct snd_usb_substream *subs = substream->runtime->private_data;
1546
1547 switch (cmd) {
1548 case SNDRV_PCM_TRIGGER_START:
1549 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1550 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1551 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1552 subs->running = 1;
1553 return 0;
1554 case SNDRV_PCM_TRIGGER_STOP:
1555 stop_endpoints(subs, false);
1556 subs->running = 0;
1557 return 0;
1558 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1559 subs->data_endpoint->prepare_data_urb = NULL;
1560 /* keep retire_data_urb for delay calculation */
1561 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1562 subs->running = 0;
1563 return 0;
1564 }
1565
1566 return -EINVAL;
1567 }
1568
1569 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1570 int cmd)
1571 {
1572 int err;
1573 struct snd_usb_substream *subs = substream->runtime->private_data;
1574
1575 switch (cmd) {
1576 case SNDRV_PCM_TRIGGER_START:
1577 err = start_endpoints(subs, false);
1578 if (err < 0)
1579 return err;
1580
1581 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1582 subs->running = 1;
1583 return 0;
1584 case SNDRV_PCM_TRIGGER_STOP:
1585 stop_endpoints(subs, false);
1586 subs->running = 0;
1587 return 0;
1588 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1589 subs->data_endpoint->retire_data_urb = NULL;
1590 subs->running = 0;
1591 return 0;
1592 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1593 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1594 subs->running = 1;
1595 return 0;
1596 }
1597
1598 return -EINVAL;
1599 }
1600
1601 static struct snd_pcm_ops snd_usb_playback_ops = {
1602 .open = snd_usb_playback_open,
1603 .close = snd_usb_playback_close,
1604 .ioctl = snd_pcm_lib_ioctl,
1605 .hw_params = snd_usb_hw_params,
1606 .hw_free = snd_usb_hw_free,
1607 .prepare = snd_usb_pcm_prepare,
1608 .trigger = snd_usb_substream_playback_trigger,
1609 .pointer = snd_usb_pcm_pointer,
1610 .page = snd_pcm_lib_get_vmalloc_page,
1611 .mmap = snd_pcm_lib_mmap_vmalloc,
1612 };
1613
1614 static struct snd_pcm_ops snd_usb_capture_ops = {
1615 .open = snd_usb_capture_open,
1616 .close = snd_usb_capture_close,
1617 .ioctl = snd_pcm_lib_ioctl,
1618 .hw_params = snd_usb_hw_params,
1619 .hw_free = snd_usb_hw_free,
1620 .prepare = snd_usb_pcm_prepare,
1621 .trigger = snd_usb_substream_capture_trigger,
1622 .pointer = snd_usb_pcm_pointer,
1623 .page = snd_pcm_lib_get_vmalloc_page,
1624 .mmap = snd_pcm_lib_mmap_vmalloc,
1625 };
1626
1627 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1628 {
1629 snd_pcm_set_ops(pcm, stream,
1630 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1631 &snd_usb_playback_ops : &snd_usb_capture_ops);
1632 }
Linux kernel - Deliverables
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