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Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm
[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 (atomic_read(&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 if (get_iface_desc(alts)->bNumEndpoints < 1)
163 return -EINVAL;
164 ep = get_endpoint(alts, 0)->bEndpointAddress;
165
166 data[0] = 1;
167 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
170 data, sizeof(data))) < 0) {
171 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
172 iface, ep);
173 return err;
174 }
175
176 return 0;
177 }
178
179 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
180 struct usb_host_interface *alts,
181 struct audioformat *fmt)
182 {
183 struct usb_device *dev = chip->dev;
184 unsigned char data[1];
185 int err;
186
187 data[0] = 1;
188 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
189 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
190 UAC2_EP_CS_PITCH << 8, 0,
191 data, sizeof(data))) < 0) {
192 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
193 iface, fmt->altsetting);
194 return err;
195 }
196
197 return 0;
198 }
199
200 /*
201 * initialize the pitch control and sample rate
202 */
203 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
204 struct usb_host_interface *alts,
205 struct audioformat *fmt)
206 {
207 /* if endpoint doesn't have pitch control, bail out */
208 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
209 return 0;
210
211 switch (fmt->protocol) {
212 case UAC_VERSION_1:
213 default:
214 return init_pitch_v1(chip, iface, alts, fmt);
215
216 case UAC_VERSION_2:
217 return init_pitch_v2(chip, iface, alts, fmt);
218 }
219 }
220
221 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
222 {
223 int err;
224
225 if (!subs->data_endpoint)
226 return -EINVAL;
227
228 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
229 struct snd_usb_endpoint *ep = subs->data_endpoint;
230
231 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
232
233 ep->data_subs = subs;
234 err = snd_usb_endpoint_start(ep, can_sleep);
235 if (err < 0) {
236 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
237 return err;
238 }
239 }
240
241 if (subs->sync_endpoint &&
242 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
243 struct snd_usb_endpoint *ep = subs->sync_endpoint;
244
245 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
246 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
247 err = usb_set_interface(subs->dev,
248 subs->sync_endpoint->iface,
249 subs->sync_endpoint->altsetting);
250 if (err < 0) {
251 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
252 dev_err(&subs->dev->dev,
253 "%d:%d: cannot set interface (%d)\n",
254 subs->sync_endpoint->iface,
255 subs->sync_endpoint->altsetting, err);
256 return -EIO;
257 }
258 }
259
260 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
261
262 ep->sync_slave = subs->data_endpoint;
263 err = snd_usb_endpoint_start(ep, can_sleep);
264 if (err < 0) {
265 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
266 return err;
267 }
268 }
269
270 return 0;
271 }
272
273 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
274 {
275 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
276 snd_usb_endpoint_stop(subs->sync_endpoint);
277
278 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
279 snd_usb_endpoint_stop(subs->data_endpoint);
280
281 if (wait) {
282 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
283 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
284 }
285 }
286
287 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
288 unsigned int altsetting,
289 struct usb_host_interface **alts,
290 unsigned int *ep)
291 {
292 struct usb_interface *iface;
293 struct usb_interface_descriptor *altsd;
294 struct usb_endpoint_descriptor *epd;
295
296 iface = usb_ifnum_to_if(dev, ifnum);
297 if (!iface || iface->num_altsetting < altsetting + 1)
298 return -ENOENT;
299 *alts = &iface->altsetting[altsetting];
300 altsd = get_iface_desc(*alts);
301 if (altsd->bAlternateSetting != altsetting ||
302 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
303 (altsd->bInterfaceSubClass != 2 &&
304 altsd->bInterfaceProtocol != 2 ) ||
305 altsd->bNumEndpoints < 1)
306 return -ENOENT;
307 epd = get_endpoint(*alts, 0);
308 if (!usb_endpoint_is_isoc_in(epd) ||
309 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
310 USB_ENDPOINT_USAGE_IMPLICIT_FB)
311 return -ENOENT;
312 *ep = epd->bEndpointAddress;
313 return 0;
314 }
315
316 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
317 struct usb_device *dev,
318 struct usb_interface_descriptor *altsd,
319 unsigned int attr)
320 {
321 struct usb_host_interface *alts;
322 struct usb_interface *iface;
323 unsigned int ep;
324
325 /* Implicit feedback sync EPs consumers are always playback EPs */
326 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
327 return 0;
328
329 switch (subs->stream->chip->usb_id) {
330 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
331 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
332 ep = 0x81;
333 iface = usb_ifnum_to_if(dev, 3);
334
335 if (!iface || iface->num_altsetting == 0)
336 return -EINVAL;
337
338 alts = &iface->altsetting[1];
339 goto add_sync_ep;
340 break;
341 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
342 case USB_ID(0x0763, 0x2081):
343 ep = 0x81;
344 iface = usb_ifnum_to_if(dev, 2);
345
346 if (!iface || iface->num_altsetting == 0)
347 return -EINVAL;
348
349 alts = &iface->altsetting[1];
350 goto add_sync_ep;
351 }
352 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
353 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
354 altsd->bInterfaceProtocol == 2 &&
355 altsd->bNumEndpoints == 1 &&
356 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
357 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
358 altsd->bAlternateSetting,
359 &alts, &ep) >= 0) {
360 goto add_sync_ep;
361 }
362
363 /* No quirk */
364 return 0;
365
366 add_sync_ep:
367 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
368 alts, ep, !subs->direction,
369 SND_USB_ENDPOINT_TYPE_DATA);
370 if (!subs->sync_endpoint)
371 return -EINVAL;
372
373 subs->data_endpoint->sync_master = subs->sync_endpoint;
374
375 return 0;
376 }
377
378 static int set_sync_endpoint(struct snd_usb_substream *subs,
379 struct audioformat *fmt,
380 struct usb_device *dev,
381 struct usb_host_interface *alts,
382 struct usb_interface_descriptor *altsd)
383 {
384 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
385 unsigned int ep, attr;
386 bool implicit_fb;
387 int err;
388
389 /* we need a sync pipe in async OUT or adaptive IN mode */
390 /* check the number of EP, since some devices have broken
391 * descriptors which fool us. if it has only one EP,
392 * assume it as adaptive-out or sync-in.
393 */
394 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
395
396 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
397 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
398
399 /*
400 * In these modes the notion of sync_endpoint is irrelevant.
401 * Reset pointers to avoid using stale data from previously
402 * used settings, e.g. when configuration and endpoints were
403 * changed
404 */
405
406 subs->sync_endpoint = NULL;
407 subs->data_endpoint->sync_master = NULL;
408 }
409
410 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
411 if (err < 0)
412 return err;
413
414 if (altsd->bNumEndpoints < 2)
415 return 0;
416
417 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
418 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
419 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
420 return 0;
421
422 /*
423 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
424 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
425 * error fall back to SYNC mode and don't create sync endpoint
426 */
427
428 /* check sync-pipe endpoint */
429 /* ... and check descriptor size before accessing bSynchAddress
430 because there is a version of the SB Audigy 2 NX firmware lacking
431 the audio fields in the endpoint descriptors */
432 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
433 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
434 get_endpoint(alts, 1)->bSynchAddress != 0)) {
435 dev_err(&dev->dev,
436 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
437 fmt->iface, fmt->altsetting,
438 get_endpoint(alts, 1)->bmAttributes,
439 get_endpoint(alts, 1)->bLength,
440 get_endpoint(alts, 1)->bSynchAddress);
441 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
442 return 0;
443 return -EINVAL;
444 }
445 ep = get_endpoint(alts, 1)->bEndpointAddress;
446 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
447 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
448 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
449 dev_err(&dev->dev,
450 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
451 fmt->iface, fmt->altsetting,
452 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
453 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
454 return 0;
455 return -EINVAL;
456 }
457
458 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
459 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
460
461 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
462 alts, ep, !subs->direction,
463 implicit_fb ?
464 SND_USB_ENDPOINT_TYPE_DATA :
465 SND_USB_ENDPOINT_TYPE_SYNC);
466 if (!subs->sync_endpoint) {
467 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
468 return 0;
469 return -EINVAL;
470 }
471
472 subs->data_endpoint->sync_master = subs->sync_endpoint;
473
474 return 0;
475 }
476
477 /*
478 * find a matching format and set up the interface
479 */
480 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
481 {
482 struct usb_device *dev = subs->dev;
483 struct usb_host_interface *alts;
484 struct usb_interface_descriptor *altsd;
485 struct usb_interface *iface;
486 int err;
487
488 iface = usb_ifnum_to_if(dev, fmt->iface);
489 if (WARN_ON(!iface))
490 return -EINVAL;
491 alts = &iface->altsetting[fmt->altset_idx];
492 altsd = get_iface_desc(alts);
493 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
494 return -EINVAL;
495
496 if (fmt == subs->cur_audiofmt)
497 return 0;
498
499 /* close the old interface */
500 if (subs->interface >= 0 && subs->interface != fmt->iface) {
501 err = usb_set_interface(subs->dev, subs->interface, 0);
502 if (err < 0) {
503 dev_err(&dev->dev,
504 "%d:%d: return to setting 0 failed (%d)\n",
505 fmt->iface, fmt->altsetting, err);
506 return -EIO;
507 }
508 subs->interface = -1;
509 subs->altset_idx = 0;
510 }
511
512 /* set interface */
513 if (subs->interface != fmt->iface ||
514 subs->altset_idx != fmt->altset_idx) {
515
516 err = snd_usb_select_mode_quirk(subs, fmt);
517 if (err < 0)
518 return -EIO;
519
520 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
521 if (err < 0) {
522 dev_err(&dev->dev,
523 "%d:%d: usb_set_interface failed (%d)\n",
524 fmt->iface, fmt->altsetting, err);
525 return -EIO;
526 }
527 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
528 fmt->iface, fmt->altsetting);
529 subs->interface = fmt->iface;
530 subs->altset_idx = fmt->altset_idx;
531
532 snd_usb_set_interface_quirk(dev);
533 }
534
535 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
536 alts, fmt->endpoint, subs->direction,
537 SND_USB_ENDPOINT_TYPE_DATA);
538
539 if (!subs->data_endpoint)
540 return -EINVAL;
541
542 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
543 if (err < 0)
544 return err;
545
546 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
547 if (err < 0)
548 return err;
549
550 subs->cur_audiofmt = fmt;
551
552 snd_usb_set_format_quirk(subs, fmt);
553
554 return 0;
555 }
556
557 /*
558 * Return the score of matching two audioformats.
559 * Veto the audioformat if:
560 * - It has no channels for some reason.
561 * - Requested PCM format is not supported.
562 * - Requested sample rate is not supported.
563 */
564 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
565 struct audioformat *fp,
566 struct audioformat *match, int rate,
567 snd_pcm_format_t pcm_format)
568 {
569 int i;
570 int score = 0;
571
572 if (fp->channels < 1) {
573 dev_dbg(&subs->dev->dev,
574 "%s: (fmt @%p) no channels\n", __func__, fp);
575 return 0;
576 }
577
578 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
579 dev_dbg(&subs->dev->dev,
580 "%s: (fmt @%p) no match for format %d\n", __func__,
581 fp, pcm_format);
582 return 0;
583 }
584
585 for (i = 0; i < fp->nr_rates; i++) {
586 if (fp->rate_table[i] == rate) {
587 score++;
588 break;
589 }
590 }
591 if (!score) {
592 dev_dbg(&subs->dev->dev,
593 "%s: (fmt @%p) no match for rate %d\n", __func__,
594 fp, rate);
595 return 0;
596 }
597
598 if (fp->channels == match->channels)
599 score++;
600
601 dev_dbg(&subs->dev->dev,
602 "%s: (fmt @%p) score %d\n", __func__, fp, score);
603
604 return score;
605 }
606
607 /*
608 * Configure the sync ep using the rate and pcm format of the data ep.
609 */
610 static int configure_sync_endpoint(struct snd_usb_substream *subs)
611 {
612 int ret;
613 struct audioformat *fp;
614 struct audioformat *sync_fp = NULL;
615 int cur_score = 0;
616 int sync_period_bytes = subs->period_bytes;
617 struct snd_usb_substream *sync_subs =
618 &subs->stream->substream[subs->direction ^ 1];
619
620 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
621 !subs->stream)
622 return snd_usb_endpoint_set_params(subs->sync_endpoint,
623 subs->pcm_format,
624 subs->channels,
625 subs->period_bytes,
626 0, 0,
627 subs->cur_rate,
628 subs->cur_audiofmt,
629 NULL);
630
631 /* Try to find the best matching audioformat. */
632 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
633 int score = match_endpoint_audioformats(subs,
634 fp, subs->cur_audiofmt,
635 subs->cur_rate, subs->pcm_format);
636
637 if (score > cur_score) {
638 sync_fp = fp;
639 cur_score = score;
640 }
641 }
642
643 if (unlikely(sync_fp == NULL)) {
644 dev_err(&subs->dev->dev,
645 "%s: no valid audioformat for sync ep %x found\n",
646 __func__, sync_subs->ep_num);
647 return -EINVAL;
648 }
649
650 /*
651 * Recalculate the period bytes if channel number differ between
652 * data and sync ep audioformat.
653 */
654 if (sync_fp->channels != subs->channels) {
655 sync_period_bytes = (subs->period_bytes / subs->channels) *
656 sync_fp->channels;
657 dev_dbg(&subs->dev->dev,
658 "%s: adjusted sync ep period bytes (%d -> %d)\n",
659 __func__, subs->period_bytes, sync_period_bytes);
660 }
661
662 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
663 subs->pcm_format,
664 sync_fp->channels,
665 sync_period_bytes,
666 0, 0,
667 subs->cur_rate,
668 sync_fp,
669 NULL);
670
671 return ret;
672 }
673
674 /*
675 * configure endpoint params
676 *
677 * called during initial setup and upon resume
678 */
679 static int configure_endpoint(struct snd_usb_substream *subs)
680 {
681 int ret;
682
683 /* format changed */
684 stop_endpoints(subs, true);
685 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
686 subs->pcm_format,
687 subs->channels,
688 subs->period_bytes,
689 subs->period_frames,
690 subs->buffer_periods,
691 subs->cur_rate,
692 subs->cur_audiofmt,
693 subs->sync_endpoint);
694 if (ret < 0)
695 return ret;
696
697 if (subs->sync_endpoint)
698 ret = configure_sync_endpoint(subs);
699
700 return ret;
701 }
702
703 /*
704 * hw_params callback
705 *
706 * allocate a buffer and set the given audio format.
707 *
708 * so far we use a physically linear buffer although packetize transfer
709 * doesn't need a continuous area.
710 * if sg buffer is supported on the later version of alsa, we'll follow
711 * that.
712 */
713 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
714 struct snd_pcm_hw_params *hw_params)
715 {
716 struct snd_usb_substream *subs = substream->runtime->private_data;
717 struct audioformat *fmt;
718 int ret;
719
720 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
721 params_buffer_bytes(hw_params));
722 if (ret < 0)
723 return ret;
724
725 subs->pcm_format = params_format(hw_params);
726 subs->period_bytes = params_period_bytes(hw_params);
727 subs->period_frames = params_period_size(hw_params);
728 subs->buffer_periods = params_periods(hw_params);
729 subs->channels = params_channels(hw_params);
730 subs->cur_rate = params_rate(hw_params);
731
732 fmt = find_format(subs);
733 if (!fmt) {
734 dev_dbg(&subs->dev->dev,
735 "cannot set format: format = %#x, rate = %d, channels = %d\n",
736 subs->pcm_format, subs->cur_rate, subs->channels);
737 return -EINVAL;
738 }
739
740 ret = snd_usb_lock_shutdown(subs->stream->chip);
741 if (ret < 0)
742 return ret;
743 ret = set_format(subs, fmt);
744 snd_usb_unlock_shutdown(subs->stream->chip);
745 if (ret < 0)
746 return ret;
747
748 subs->interface = fmt->iface;
749 subs->altset_idx = fmt->altset_idx;
750 subs->need_setup_ep = true;
751
752 return 0;
753 }
754
755 /*
756 * hw_free callback
757 *
758 * reset the audio format and release the buffer
759 */
760 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
761 {
762 struct snd_usb_substream *subs = substream->runtime->private_data;
763
764 subs->cur_audiofmt = NULL;
765 subs->cur_rate = 0;
766 subs->period_bytes = 0;
767 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
768 stop_endpoints(subs, true);
769 snd_usb_endpoint_deactivate(subs->sync_endpoint);
770 snd_usb_endpoint_deactivate(subs->data_endpoint);
771 snd_usb_unlock_shutdown(subs->stream->chip);
772 }
773 return snd_pcm_lib_free_vmalloc_buffer(substream);
774 }
775
776 /*
777 * prepare callback
778 *
779 * only a few subtle things...
780 */
781 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
782 {
783 struct snd_pcm_runtime *runtime = substream->runtime;
784 struct snd_usb_substream *subs = runtime->private_data;
785 struct usb_host_interface *alts;
786 struct usb_interface *iface;
787 int ret;
788
789 if (! subs->cur_audiofmt) {
790 dev_err(&subs->dev->dev, "no format is specified!\n");
791 return -ENXIO;
792 }
793
794 ret = snd_usb_lock_shutdown(subs->stream->chip);
795 if (ret < 0)
796 return ret;
797 if (snd_BUG_ON(!subs->data_endpoint)) {
798 ret = -EIO;
799 goto unlock;
800 }
801
802 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
803 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
804
805 ret = set_format(subs, subs->cur_audiofmt);
806 if (ret < 0)
807 goto unlock;
808
809 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
810 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
811 ret = snd_usb_init_sample_rate(subs->stream->chip,
812 subs->cur_audiofmt->iface,
813 alts,
814 subs->cur_audiofmt,
815 subs->cur_rate);
816 if (ret < 0)
817 goto unlock;
818
819 if (subs->need_setup_ep) {
820 ret = configure_endpoint(subs);
821 if (ret < 0)
822 goto unlock;
823 subs->need_setup_ep = false;
824 }
825
826 /* some unit conversions in runtime */
827 subs->data_endpoint->maxframesize =
828 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
829 subs->data_endpoint->curframesize =
830 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
831
832 /* reset the pointer */
833 subs->hwptr_done = 0;
834 subs->transfer_done = 0;
835 subs->last_delay = 0;
836 subs->last_frame_number = 0;
837 runtime->delay = 0;
838
839 /* for playback, submit the URBs now; otherwise, the first hwptr_done
840 * updates for all URBs would happen at the same time when starting */
841 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
842 ret = start_endpoints(subs, true);
843
844 unlock:
845 snd_usb_unlock_shutdown(subs->stream->chip);
846 return ret;
847 }
848
849 static struct snd_pcm_hardware snd_usb_hardware =
850 {
851 .info = SNDRV_PCM_INFO_MMAP |
852 SNDRV_PCM_INFO_MMAP_VALID |
853 SNDRV_PCM_INFO_BATCH |
854 SNDRV_PCM_INFO_INTERLEAVED |
855 SNDRV_PCM_INFO_BLOCK_TRANSFER |
856 SNDRV_PCM_INFO_PAUSE,
857 .buffer_bytes_max = 1024 * 1024,
858 .period_bytes_min = 64,
859 .period_bytes_max = 512 * 1024,
860 .periods_min = 2,
861 .periods_max = 1024,
862 };
863
864 static int hw_check_valid_format(struct snd_usb_substream *subs,
865 struct snd_pcm_hw_params *params,
866 struct audioformat *fp)
867 {
868 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
869 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
870 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
871 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
872 struct snd_mask check_fmts;
873 unsigned int ptime;
874
875 /* check the format */
876 snd_mask_none(&check_fmts);
877 check_fmts.bits[0] = (u32)fp->formats;
878 check_fmts.bits[1] = (u32)(fp->formats >> 32);
879 snd_mask_intersect(&check_fmts, fmts);
880 if (snd_mask_empty(&check_fmts)) {
881 hwc_debug(" > check: no supported format %d\n", fp->format);
882 return 0;
883 }
884 /* check the channels */
885 if (fp->channels < ct->min || fp->channels > ct->max) {
886 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
887 return 0;
888 }
889 /* check the rate is within the range */
890 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
891 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
892 return 0;
893 }
894 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
895 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
896 return 0;
897 }
898 /* check whether the period time is >= the data packet interval */
899 if (subs->speed != USB_SPEED_FULL) {
900 ptime = 125 * (1 << fp->datainterval);
901 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
902 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
903 return 0;
904 }
905 }
906 return 1;
907 }
908
909 static int hw_rule_rate(struct snd_pcm_hw_params *params,
910 struct snd_pcm_hw_rule *rule)
911 {
912 struct snd_usb_substream *subs = rule->private;
913 struct audioformat *fp;
914 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
915 unsigned int rmin, rmax;
916 int changed;
917
918 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
919 changed = 0;
920 rmin = rmax = 0;
921 list_for_each_entry(fp, &subs->fmt_list, list) {
922 if (!hw_check_valid_format(subs, params, fp))
923 continue;
924 if (changed++) {
925 if (rmin > fp->rate_min)
926 rmin = fp->rate_min;
927 if (rmax < fp->rate_max)
928 rmax = fp->rate_max;
929 } else {
930 rmin = fp->rate_min;
931 rmax = fp->rate_max;
932 }
933 }
934
935 if (!changed) {
936 hwc_debug(" --> get empty\n");
937 it->empty = 1;
938 return -EINVAL;
939 }
940
941 changed = 0;
942 if (it->min < rmin) {
943 it->min = rmin;
944 it->openmin = 0;
945 changed = 1;
946 }
947 if (it->max > rmax) {
948 it->max = rmax;
949 it->openmax = 0;
950 changed = 1;
951 }
952 if (snd_interval_checkempty(it)) {
953 it->empty = 1;
954 return -EINVAL;
955 }
956 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
957 return changed;
958 }
959
960
961 static int hw_rule_channels(struct snd_pcm_hw_params *params,
962 struct snd_pcm_hw_rule *rule)
963 {
964 struct snd_usb_substream *subs = rule->private;
965 struct audioformat *fp;
966 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
967 unsigned int rmin, rmax;
968 int changed;
969
970 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
971 changed = 0;
972 rmin = rmax = 0;
973 list_for_each_entry(fp, &subs->fmt_list, list) {
974 if (!hw_check_valid_format(subs, params, fp))
975 continue;
976 if (changed++) {
977 if (rmin > fp->channels)
978 rmin = fp->channels;
979 if (rmax < fp->channels)
980 rmax = fp->channels;
981 } else {
982 rmin = fp->channels;
983 rmax = fp->channels;
984 }
985 }
986
987 if (!changed) {
988 hwc_debug(" --> get empty\n");
989 it->empty = 1;
990 return -EINVAL;
991 }
992
993 changed = 0;
994 if (it->min < rmin) {
995 it->min = rmin;
996 it->openmin = 0;
997 changed = 1;
998 }
999 if (it->max > rmax) {
1000 it->max = rmax;
1001 it->openmax = 0;
1002 changed = 1;
1003 }
1004 if (snd_interval_checkempty(it)) {
1005 it->empty = 1;
1006 return -EINVAL;
1007 }
1008 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1009 return changed;
1010 }
1011
1012 static int hw_rule_format(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_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1018 u64 fbits;
1019 u32 oldbits[2];
1020 int changed;
1021
1022 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1023 fbits = 0;
1024 list_for_each_entry(fp, &subs->fmt_list, list) {
1025 if (!hw_check_valid_format(subs, params, fp))
1026 continue;
1027 fbits |= fp->formats;
1028 }
1029
1030 oldbits[0] = fmt->bits[0];
1031 oldbits[1] = fmt->bits[1];
1032 fmt->bits[0] &= (u32)fbits;
1033 fmt->bits[1] &= (u32)(fbits >> 32);
1034 if (!fmt->bits[0] && !fmt->bits[1]) {
1035 hwc_debug(" --> get empty\n");
1036 return -EINVAL;
1037 }
1038 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1039 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1040 return changed;
1041 }
1042
1043 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1044 struct snd_pcm_hw_rule *rule)
1045 {
1046 struct snd_usb_substream *subs = rule->private;
1047 struct audioformat *fp;
1048 struct snd_interval *it;
1049 unsigned char min_datainterval;
1050 unsigned int pmin;
1051 int changed;
1052
1053 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1054 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1055 min_datainterval = 0xff;
1056 list_for_each_entry(fp, &subs->fmt_list, list) {
1057 if (!hw_check_valid_format(subs, params, fp))
1058 continue;
1059 min_datainterval = min(min_datainterval, fp->datainterval);
1060 }
1061 if (min_datainterval == 0xff) {
1062 hwc_debug(" --> get empty\n");
1063 it->empty = 1;
1064 return -EINVAL;
1065 }
1066 pmin = 125 * (1 << min_datainterval);
1067 changed = 0;
1068 if (it->min < pmin) {
1069 it->min = pmin;
1070 it->openmin = 0;
1071 changed = 1;
1072 }
1073 if (snd_interval_checkempty(it)) {
1074 it->empty = 1;
1075 return -EINVAL;
1076 }
1077 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1078 return changed;
1079 }
1080
1081 /*
1082 * If the device supports unusual bit rates, does the request meet these?
1083 */
1084 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1085 struct snd_usb_substream *subs)
1086 {
1087 struct audioformat *fp;
1088 int *rate_list;
1089 int count = 0, needs_knot = 0;
1090 int err;
1091
1092 kfree(subs->rate_list.list);
1093 subs->rate_list.list = NULL;
1094
1095 list_for_each_entry(fp, &subs->fmt_list, list) {
1096 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1097 return 0;
1098 count += fp->nr_rates;
1099 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1100 needs_knot = 1;
1101 }
1102 if (!needs_knot)
1103 return 0;
1104
1105 subs->rate_list.list = rate_list =
1106 kmalloc(sizeof(int) * count, GFP_KERNEL);
1107 if (!subs->rate_list.list)
1108 return -ENOMEM;
1109 subs->rate_list.count = count;
1110 subs->rate_list.mask = 0;
1111 count = 0;
1112 list_for_each_entry(fp, &subs->fmt_list, list) {
1113 int i;
1114 for (i = 0; i < fp->nr_rates; i++)
1115 rate_list[count++] = fp->rate_table[i];
1116 }
1117 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1118 &subs->rate_list);
1119 if (err < 0)
1120 return err;
1121
1122 return 0;
1123 }
1124
1125
1126 /*
1127 * set up the runtime hardware information.
1128 */
1129
1130 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1131 {
1132 struct audioformat *fp;
1133 unsigned int pt, ptmin;
1134 int param_period_time_if_needed;
1135 int err;
1136
1137 runtime->hw.formats = subs->formats;
1138
1139 runtime->hw.rate_min = 0x7fffffff;
1140 runtime->hw.rate_max = 0;
1141 runtime->hw.channels_min = 256;
1142 runtime->hw.channels_max = 0;
1143 runtime->hw.rates = 0;
1144 ptmin = UINT_MAX;
1145 /* check min/max rates and channels */
1146 list_for_each_entry(fp, &subs->fmt_list, list) {
1147 runtime->hw.rates |= fp->rates;
1148 if (runtime->hw.rate_min > fp->rate_min)
1149 runtime->hw.rate_min = fp->rate_min;
1150 if (runtime->hw.rate_max < fp->rate_max)
1151 runtime->hw.rate_max = fp->rate_max;
1152 if (runtime->hw.channels_min > fp->channels)
1153 runtime->hw.channels_min = fp->channels;
1154 if (runtime->hw.channels_max < fp->channels)
1155 runtime->hw.channels_max = fp->channels;
1156 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1157 /* FIXME: there might be more than one audio formats... */
1158 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1159 fp->frame_size;
1160 }
1161 pt = 125 * (1 << fp->datainterval);
1162 ptmin = min(ptmin, pt);
1163 }
1164 err = snd_usb_autoresume(subs->stream->chip);
1165 if (err < 0)
1166 return err;
1167
1168 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1169 if (subs->speed == USB_SPEED_FULL)
1170 /* full speed devices have fixed data packet interval */
1171 ptmin = 1000;
1172 if (ptmin == 1000)
1173 /* if period time doesn't go below 1 ms, no rules needed */
1174 param_period_time_if_needed = -1;
1175 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1176 ptmin, UINT_MAX);
1177
1178 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1179 hw_rule_rate, subs,
1180 SNDRV_PCM_HW_PARAM_FORMAT,
1181 SNDRV_PCM_HW_PARAM_CHANNELS,
1182 param_period_time_if_needed,
1183 -1)) < 0)
1184 goto rep_err;
1185 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1186 hw_rule_channels, subs,
1187 SNDRV_PCM_HW_PARAM_FORMAT,
1188 SNDRV_PCM_HW_PARAM_RATE,
1189 param_period_time_if_needed,
1190 -1)) < 0)
1191 goto rep_err;
1192 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1193 hw_rule_format, subs,
1194 SNDRV_PCM_HW_PARAM_RATE,
1195 SNDRV_PCM_HW_PARAM_CHANNELS,
1196 param_period_time_if_needed,
1197 -1)) < 0)
1198 goto rep_err;
1199 if (param_period_time_if_needed >= 0) {
1200 err = snd_pcm_hw_rule_add(runtime, 0,
1201 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1202 hw_rule_period_time, subs,
1203 SNDRV_PCM_HW_PARAM_FORMAT,
1204 SNDRV_PCM_HW_PARAM_CHANNELS,
1205 SNDRV_PCM_HW_PARAM_RATE,
1206 -1);
1207 if (err < 0)
1208 goto rep_err;
1209 }
1210 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1211 goto rep_err;
1212 return 0;
1213
1214 rep_err:
1215 snd_usb_autosuspend(subs->stream->chip);
1216 return err;
1217 }
1218
1219 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1220 {
1221 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1222 struct snd_pcm_runtime *runtime = substream->runtime;
1223 struct snd_usb_substream *subs = &as->substream[direction];
1224
1225 subs->interface = -1;
1226 subs->altset_idx = 0;
1227 runtime->hw = snd_usb_hardware;
1228 runtime->private_data = subs;
1229 subs->pcm_substream = substream;
1230 /* runtime PM is also done there */
1231
1232 /* initialize DSD/DOP context */
1233 subs->dsd_dop.byte_idx = 0;
1234 subs->dsd_dop.channel = 0;
1235 subs->dsd_dop.marker = 1;
1236
1237 return setup_hw_info(runtime, subs);
1238 }
1239
1240 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1241 {
1242 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1243 struct snd_usb_substream *subs = &as->substream[direction];
1244
1245 stop_endpoints(subs, true);
1246
1247 if (subs->interface >= 0 &&
1248 !snd_usb_lock_shutdown(subs->stream->chip)) {
1249 usb_set_interface(subs->dev, subs->interface, 0);
1250 subs->interface = -1;
1251 snd_usb_unlock_shutdown(subs->stream->chip);
1252 }
1253
1254 subs->pcm_substream = NULL;
1255 snd_usb_autosuspend(subs->stream->chip);
1256
1257 return 0;
1258 }
1259
1260 /* Since a URB can handle only a single linear buffer, we must use double
1261 * buffering when the data to be transferred overflows the buffer boundary.
1262 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1263 * for all URBs.
1264 */
1265 static void retire_capture_urb(struct snd_usb_substream *subs,
1266 struct urb *urb)
1267 {
1268 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1269 unsigned int stride, frames, bytes, oldptr;
1270 int i, period_elapsed = 0;
1271 unsigned long flags;
1272 unsigned char *cp;
1273 int current_frame_number;
1274
1275 /* read frame number here, update pointer in critical section */
1276 current_frame_number = usb_get_current_frame_number(subs->dev);
1277
1278 stride = runtime->frame_bits >> 3;
1279
1280 for (i = 0; i < urb->number_of_packets; i++) {
1281 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1282 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1283 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1284 i, urb->iso_frame_desc[i].status);
1285 // continue;
1286 }
1287 bytes = urb->iso_frame_desc[i].actual_length;
1288 frames = bytes / stride;
1289 if (!subs->txfr_quirk)
1290 bytes = frames * stride;
1291 if (bytes % (runtime->sample_bits >> 3) != 0) {
1292 int oldbytes = bytes;
1293 bytes = frames * stride;
1294 dev_warn(&subs->dev->dev,
1295 "Corrected urb data len. %d->%d\n",
1296 oldbytes, bytes);
1297 }
1298 /* update the current pointer */
1299 spin_lock_irqsave(&subs->lock, flags);
1300 oldptr = subs->hwptr_done;
1301 subs->hwptr_done += bytes;
1302 if (subs->hwptr_done >= runtime->buffer_size * stride)
1303 subs->hwptr_done -= runtime->buffer_size * stride;
1304 frames = (bytes + (oldptr % stride)) / stride;
1305 subs->transfer_done += frames;
1306 if (subs->transfer_done >= runtime->period_size) {
1307 subs->transfer_done -= runtime->period_size;
1308 period_elapsed = 1;
1309 }
1310 /* capture delay is by construction limited to one URB,
1311 * reset delays here
1312 */
1313 runtime->delay = subs->last_delay = 0;
1314
1315 /* realign last_frame_number */
1316 subs->last_frame_number = current_frame_number;
1317 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1318
1319 spin_unlock_irqrestore(&subs->lock, flags);
1320 /* copy a data chunk */
1321 if (oldptr + bytes > runtime->buffer_size * stride) {
1322 unsigned int bytes1 =
1323 runtime->buffer_size * stride - oldptr;
1324 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1325 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1326 } else {
1327 memcpy(runtime->dma_area + oldptr, cp, bytes);
1328 }
1329 }
1330
1331 if (period_elapsed)
1332 snd_pcm_period_elapsed(subs->pcm_substream);
1333 }
1334
1335 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1336 struct urb *urb, unsigned int bytes)
1337 {
1338 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1339 unsigned int stride = runtime->frame_bits >> 3;
1340 unsigned int dst_idx = 0;
1341 unsigned int src_idx = subs->hwptr_done;
1342 unsigned int wrap = runtime->buffer_size * stride;
1343 u8 *dst = urb->transfer_buffer;
1344 u8 *src = runtime->dma_area;
1345 u8 marker[] = { 0x05, 0xfa };
1346
1347 /*
1348 * The DSP DOP format defines a way to transport DSD samples over
1349 * normal PCM data endpoints. It requires stuffing of marker bytes
1350 * (0x05 and 0xfa, alternating per sample frame), and then expects
1351 * 2 additional bytes of actual payload. The whole frame is stored
1352 * LSB.
1353 *
1354 * Hence, for a stereo transport, the buffer layout looks like this,
1355 * where L refers to left channel samples and R to right.
1356 *
1357 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1358 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1359 * .....
1360 *
1361 */
1362
1363 while (bytes--) {
1364 if (++subs->dsd_dop.byte_idx == 3) {
1365 /* frame boundary? */
1366 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1367 src_idx += 2;
1368 subs->dsd_dop.byte_idx = 0;
1369
1370 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1371 /* alternate the marker */
1372 subs->dsd_dop.marker++;
1373 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1374 subs->dsd_dop.channel = 0;
1375 }
1376 } else {
1377 /* stuff the DSD payload */
1378 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1379
1380 if (subs->cur_audiofmt->dsd_bitrev)
1381 dst[dst_idx++] = bitrev8(src[idx]);
1382 else
1383 dst[dst_idx++] = src[idx];
1384
1385 subs->hwptr_done++;
1386 }
1387 }
1388 if (subs->hwptr_done >= runtime->buffer_size * stride)
1389 subs->hwptr_done -= runtime->buffer_size * stride;
1390 }
1391
1392 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1393 int offset, int stride, unsigned int bytes)
1394 {
1395 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1396
1397 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1398 /* err, the transferred area goes over buffer boundary. */
1399 unsigned int bytes1 =
1400 runtime->buffer_size * stride - subs->hwptr_done;
1401 memcpy(urb->transfer_buffer + offset,
1402 runtime->dma_area + subs->hwptr_done, bytes1);
1403 memcpy(urb->transfer_buffer + offset + bytes1,
1404 runtime->dma_area, bytes - bytes1);
1405 } else {
1406 memcpy(urb->transfer_buffer + offset,
1407 runtime->dma_area + subs->hwptr_done, bytes);
1408 }
1409 subs->hwptr_done += bytes;
1410 if (subs->hwptr_done >= runtime->buffer_size * stride)
1411 subs->hwptr_done -= runtime->buffer_size * stride;
1412 }
1413
1414 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1415 struct urb *urb, int stride,
1416 unsigned int bytes)
1417 {
1418 __le32 packet_length;
1419 int i;
1420
1421 /* Put __le32 length descriptor at start of each packet. */
1422 for (i = 0; i < urb->number_of_packets; i++) {
1423 unsigned int length = urb->iso_frame_desc[i].length;
1424 unsigned int offset = urb->iso_frame_desc[i].offset;
1425
1426 packet_length = cpu_to_le32(length);
1427 offset += i * sizeof(packet_length);
1428 urb->iso_frame_desc[i].offset = offset;
1429 urb->iso_frame_desc[i].length += sizeof(packet_length);
1430 memcpy(urb->transfer_buffer + offset,
1431 &packet_length, sizeof(packet_length));
1432 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1433 stride, length);
1434 }
1435 /* Adjust transfer size accordingly. */
1436 bytes += urb->number_of_packets * sizeof(packet_length);
1437 return bytes;
1438 }
1439
1440 static void prepare_playback_urb(struct snd_usb_substream *subs,
1441 struct urb *urb)
1442 {
1443 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1444 struct snd_usb_endpoint *ep = subs->data_endpoint;
1445 struct snd_urb_ctx *ctx = urb->context;
1446 unsigned int counts, frames, bytes;
1447 int i, stride, period_elapsed = 0;
1448 unsigned long flags;
1449
1450 stride = runtime->frame_bits >> 3;
1451
1452 frames = 0;
1453 urb->number_of_packets = 0;
1454 spin_lock_irqsave(&subs->lock, flags);
1455 subs->frame_limit += ep->max_urb_frames;
1456 for (i = 0; i < ctx->packets; i++) {
1457 if (ctx->packet_size[i])
1458 counts = ctx->packet_size[i];
1459 else
1460 counts = snd_usb_endpoint_next_packet_size(ep);
1461
1462 /* set up descriptor */
1463 urb->iso_frame_desc[i].offset = frames * ep->stride;
1464 urb->iso_frame_desc[i].length = counts * ep->stride;
1465 frames += counts;
1466 urb->number_of_packets++;
1467 subs->transfer_done += counts;
1468 if (subs->transfer_done >= runtime->period_size) {
1469 subs->transfer_done -= runtime->period_size;
1470 subs->frame_limit = 0;
1471 period_elapsed = 1;
1472 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1473 if (subs->transfer_done > 0) {
1474 /* FIXME: fill-max mode is not
1475 * supported yet */
1476 frames -= subs->transfer_done;
1477 counts -= subs->transfer_done;
1478 urb->iso_frame_desc[i].length =
1479 counts * ep->stride;
1480 subs->transfer_done = 0;
1481 }
1482 i++;
1483 if (i < ctx->packets) {
1484 /* add a transfer delimiter */
1485 urb->iso_frame_desc[i].offset =
1486 frames * ep->stride;
1487 urb->iso_frame_desc[i].length = 0;
1488 urb->number_of_packets++;
1489 }
1490 break;
1491 }
1492 }
1493 /* finish at the period boundary or after enough frames */
1494 if ((period_elapsed ||
1495 subs->transfer_done >= subs->frame_limit) &&
1496 !snd_usb_endpoint_implicit_feedback_sink(ep))
1497 break;
1498 }
1499 bytes = frames * ep->stride;
1500
1501 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1502 subs->cur_audiofmt->dsd_dop)) {
1503 fill_playback_urb_dsd_dop(subs, urb, bytes);
1504 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1505 subs->cur_audiofmt->dsd_bitrev)) {
1506 /* bit-reverse the bytes */
1507 u8 *buf = urb->transfer_buffer;
1508 for (i = 0; i < bytes; i++) {
1509 int idx = (subs->hwptr_done + i)
1510 % (runtime->buffer_size * stride);
1511 buf[i] = bitrev8(runtime->dma_area[idx]);
1512 }
1513
1514 subs->hwptr_done += bytes;
1515 if (subs->hwptr_done >= runtime->buffer_size * stride)
1516 subs->hwptr_done -= runtime->buffer_size * stride;
1517 } else {
1518 /* usual PCM */
1519 if (!subs->tx_length_quirk)
1520 copy_to_urb(subs, urb, 0, stride, bytes);
1521 else
1522 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1523 /* bytes is now amount of outgoing data */
1524 }
1525
1526 /* update delay with exact number of samples queued */
1527 runtime->delay = subs->last_delay;
1528 runtime->delay += frames;
1529 subs->last_delay = runtime->delay;
1530
1531 /* realign last_frame_number */
1532 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1533 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1534
1535 if (subs->trigger_tstamp_pending_update) {
1536 /* this is the first actual URB submitted,
1537 * update trigger timestamp to reflect actual start time
1538 */
1539 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1540 subs->trigger_tstamp_pending_update = false;
1541 }
1542
1543 spin_unlock_irqrestore(&subs->lock, flags);
1544 urb->transfer_buffer_length = bytes;
1545 if (period_elapsed)
1546 snd_pcm_period_elapsed(subs->pcm_substream);
1547 }
1548
1549 /*
1550 * process after playback data complete
1551 * - decrease the delay count again
1552 */
1553 static void retire_playback_urb(struct snd_usb_substream *subs,
1554 struct urb *urb)
1555 {
1556 unsigned long flags;
1557 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1558 struct snd_usb_endpoint *ep = subs->data_endpoint;
1559 int processed = urb->transfer_buffer_length / ep->stride;
1560 int est_delay;
1561
1562 /* ignore the delay accounting when procssed=0 is given, i.e.
1563 * silent payloads are procssed before handling the actual data
1564 */
1565 if (!processed)
1566 return;
1567
1568 spin_lock_irqsave(&subs->lock, flags);
1569 if (!subs->last_delay)
1570 goto out; /* short path */
1571
1572 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1573 /* update delay with exact number of samples played */
1574 if (processed > subs->last_delay)
1575 subs->last_delay = 0;
1576 else
1577 subs->last_delay -= processed;
1578 runtime->delay = subs->last_delay;
1579
1580 /*
1581 * Report when delay estimate is off by more than 2ms.
1582 * The error should be lower than 2ms since the estimate relies
1583 * on two reads of a counter updated every ms.
1584 */
1585 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1586 dev_dbg_ratelimited(&subs->dev->dev,
1587 "delay: estimated %d, actual %d\n",
1588 est_delay, subs->last_delay);
1589
1590 if (!subs->running) {
1591 /* update last_frame_number for delay counting here since
1592 * prepare_playback_urb won't be called during pause
1593 */
1594 subs->last_frame_number =
1595 usb_get_current_frame_number(subs->dev) & 0xff;
1596 }
1597
1598 out:
1599 spin_unlock_irqrestore(&subs->lock, flags);
1600 }
1601
1602 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1603 {
1604 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1605 }
1606
1607 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1608 {
1609 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1610 }
1611
1612 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1613 {
1614 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1615 }
1616
1617 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1618 {
1619 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1620 }
1621
1622 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1623 int cmd)
1624 {
1625 struct snd_usb_substream *subs = substream->runtime->private_data;
1626
1627 switch (cmd) {
1628 case SNDRV_PCM_TRIGGER_START:
1629 subs->trigger_tstamp_pending_update = true;
1630 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1631 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1632 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1633 subs->running = 1;
1634 return 0;
1635 case SNDRV_PCM_TRIGGER_STOP:
1636 stop_endpoints(subs, false);
1637 subs->running = 0;
1638 return 0;
1639 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1640 subs->data_endpoint->prepare_data_urb = NULL;
1641 /* keep retire_data_urb for delay calculation */
1642 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1643 subs->running = 0;
1644 return 0;
1645 }
1646
1647 return -EINVAL;
1648 }
1649
1650 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1651 int cmd)
1652 {
1653 int err;
1654 struct snd_usb_substream *subs = substream->runtime->private_data;
1655
1656 switch (cmd) {
1657 case SNDRV_PCM_TRIGGER_START:
1658 err = start_endpoints(subs, false);
1659 if (err < 0)
1660 return err;
1661
1662 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1663 subs->running = 1;
1664 return 0;
1665 case SNDRV_PCM_TRIGGER_STOP:
1666 stop_endpoints(subs, false);
1667 subs->running = 0;
1668 return 0;
1669 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1670 subs->data_endpoint->retire_data_urb = NULL;
1671 subs->running = 0;
1672 return 0;
1673 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1674 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1675 subs->running = 1;
1676 return 0;
1677 }
1678
1679 return -EINVAL;
1680 }
1681
1682 static struct snd_pcm_ops snd_usb_playback_ops = {
1683 .open = snd_usb_playback_open,
1684 .close = snd_usb_playback_close,
1685 .ioctl = snd_pcm_lib_ioctl,
1686 .hw_params = snd_usb_hw_params,
1687 .hw_free = snd_usb_hw_free,
1688 .prepare = snd_usb_pcm_prepare,
1689 .trigger = snd_usb_substream_playback_trigger,
1690 .pointer = snd_usb_pcm_pointer,
1691 .page = snd_pcm_lib_get_vmalloc_page,
1692 .mmap = snd_pcm_lib_mmap_vmalloc,
1693 };
1694
1695 static struct snd_pcm_ops snd_usb_capture_ops = {
1696 .open = snd_usb_capture_open,
1697 .close = snd_usb_capture_close,
1698 .ioctl = snd_pcm_lib_ioctl,
1699 .hw_params = snd_usb_hw_params,
1700 .hw_free = snd_usb_hw_free,
1701 .prepare = snd_usb_pcm_prepare,
1702 .trigger = snd_usb_substream_capture_trigger,
1703 .pointer = snd_usb_pcm_pointer,
1704 .page = snd_pcm_lib_get_vmalloc_page,
1705 .mmap = snd_pcm_lib_mmap_vmalloc,
1706 };
1707
1708 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1709 {
1710 snd_pcm_set_ops(pcm, stream,
1711 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1712 &snd_usb_playback_ops : &snd_usb_capture_ops);
1713 }
Linux kernel - Deliverables
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