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Linux 4.16.11
[linux/fpc-iii.git] / sound / usb / pcm.c
blob3cbfae6604f98b77f5cc6fe12c32ce4f7ce477c7
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)
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);
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);
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 case USB_ID(0x2466, 0x8003):
352 ep = 0x86;
353 iface = usb_ifnum_to_if(dev, 2);
354
355 if (!iface || iface->num_altsetting == 0)
356 return -EINVAL;
357
358 alts = &iface->altsetting[1];
359 goto add_sync_ep;
360 case USB_ID(0x1397, 0x0002):
361 ep = 0x81;
362 iface = usb_ifnum_to_if(dev, 1);
363
364 if (!iface || iface->num_altsetting == 0)
365 return -EINVAL;
366
367 alts = &iface->altsetting[1];
368 goto add_sync_ep;
369
370 }
371 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
372 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
373 altsd->bInterfaceProtocol == 2 &&
374 altsd->bNumEndpoints == 1 &&
375 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
376 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
377 altsd->bAlternateSetting,
378 &alts, &ep) >= 0) {
379 goto add_sync_ep;
380 }
381
382 /* No quirk */
383 return 0;
384
385 add_sync_ep:
386 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
387 alts, ep, !subs->direction,
388 SND_USB_ENDPOINT_TYPE_DATA);
389 if (!subs->sync_endpoint)
390 return -EINVAL;
391
392 subs->data_endpoint->sync_master = subs->sync_endpoint;
393
394 return 0;
395 }
396
397 static int set_sync_endpoint(struct snd_usb_substream *subs,
398 struct audioformat *fmt,
399 struct usb_device *dev,
400 struct usb_host_interface *alts,
401 struct usb_interface_descriptor *altsd)
402 {
403 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
404 unsigned int ep, attr;
405 bool implicit_fb;
406 int err;
407
408 /* we need a sync pipe in async OUT or adaptive IN mode */
409 /* check the number of EP, since some devices have broken
410 * descriptors which fool us. if it has only one EP,
411 * assume it as adaptive-out or sync-in.
412 */
413 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
414
415 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
416 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
417
418 /*
419 * In these modes the notion of sync_endpoint is irrelevant.
420 * Reset pointers to avoid using stale data from previously
421 * used settings, e.g. when configuration and endpoints were
422 * changed
423 */
424
425 subs->sync_endpoint = NULL;
426 subs->data_endpoint->sync_master = NULL;
427 }
428
429 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
430 if (err < 0)
431 return err;
432
433 if (altsd->bNumEndpoints < 2)
434 return 0;
435
436 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
437 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
438 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
439 return 0;
440
441 /*
442 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
443 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
444 * error fall back to SYNC mode and don't create sync endpoint
445 */
446
447 /* check sync-pipe endpoint */
448 /* ... and check descriptor size before accessing bSynchAddress
449 because there is a version of the SB Audigy 2 NX firmware lacking
450 the audio fields in the endpoint descriptors */
451 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
452 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
453 get_endpoint(alts, 1)->bSynchAddress != 0)) {
454 dev_err(&dev->dev,
455 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
456 fmt->iface, fmt->altsetting,
457 get_endpoint(alts, 1)->bmAttributes,
458 get_endpoint(alts, 1)->bLength,
459 get_endpoint(alts, 1)->bSynchAddress);
460 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
461 return 0;
462 return -EINVAL;
463 }
464 ep = get_endpoint(alts, 1)->bEndpointAddress;
465 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
466 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
467 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
468 dev_err(&dev->dev,
469 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
470 fmt->iface, fmt->altsetting,
471 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
472 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
473 return 0;
474 return -EINVAL;
475 }
476
477 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
478 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
479
480 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
481 alts, ep, !subs->direction,
482 implicit_fb ?
483 SND_USB_ENDPOINT_TYPE_DATA :
484 SND_USB_ENDPOINT_TYPE_SYNC);
485 if (!subs->sync_endpoint) {
486 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
487 return 0;
488 return -EINVAL;
489 }
490
491 subs->data_endpoint->sync_master = subs->sync_endpoint;
492
493 return 0;
494 }
495
496 /*
497 * find a matching format and set up the interface
498 */
499 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
500 {
501 struct usb_device *dev = subs->dev;
502 struct usb_host_interface *alts;
503 struct usb_interface_descriptor *altsd;
504 struct usb_interface *iface;
505 int err;
506
507 iface = usb_ifnum_to_if(dev, fmt->iface);
508 if (WARN_ON(!iface))
509 return -EINVAL;
510 alts = &iface->altsetting[fmt->altset_idx];
511 altsd = get_iface_desc(alts);
512 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
513 return -EINVAL;
514
515 if (fmt == subs->cur_audiofmt)
516 return 0;
517
518 /* close the old interface */
519 if (subs->interface >= 0 && subs->interface != fmt->iface) {
520 err = usb_set_interface(subs->dev, subs->interface, 0);
521 if (err < 0) {
522 dev_err(&dev->dev,
523 "%d:%d: return to setting 0 failed (%d)\n",
524 fmt->iface, fmt->altsetting, err);
525 return -EIO;
526 }
527 subs->interface = -1;
528 subs->altset_idx = 0;
529 }
530
531 /* set interface */
532 if (subs->interface != fmt->iface ||
533 subs->altset_idx != fmt->altset_idx) {
534
535 err = snd_usb_select_mode_quirk(subs, fmt);
536 if (err < 0)
537 return -EIO;
538
539 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
540 if (err < 0) {
541 dev_err(&dev->dev,
542 "%d:%d: usb_set_interface failed (%d)\n",
543 fmt->iface, fmt->altsetting, err);
544 return -EIO;
545 }
546 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
547 fmt->iface, fmt->altsetting);
548 subs->interface = fmt->iface;
549 subs->altset_idx = fmt->altset_idx;
550
551 snd_usb_set_interface_quirk(dev);
552 }
553
554 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
555 alts, fmt->endpoint, subs->direction,
556 SND_USB_ENDPOINT_TYPE_DATA);
557
558 if (!subs->data_endpoint)
559 return -EINVAL;
560
561 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
562 if (err < 0)
563 return err;
564
565 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
566 if (err < 0)
567 return err;
568
569 subs->cur_audiofmt = fmt;
570
571 snd_usb_set_format_quirk(subs, fmt);
572
573 return 0;
574 }
575
576 /*
577 * Return the score of matching two audioformats.
578 * Veto the audioformat if:
579 * - It has no channels for some reason.
580 * - Requested PCM format is not supported.
581 * - Requested sample rate is not supported.
582 */
583 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
584 struct audioformat *fp,
585 struct audioformat *match, int rate,
586 snd_pcm_format_t pcm_format)
587 {
588 int i;
589 int score = 0;
590
591 if (fp->channels < 1) {
592 dev_dbg(&subs->dev->dev,
593 "%s: (fmt @%p) no channels\n", __func__, fp);
594 return 0;
595 }
596
597 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
598 dev_dbg(&subs->dev->dev,
599 "%s: (fmt @%p) no match for format %d\n", __func__,
600 fp, pcm_format);
601 return 0;
602 }
603
604 for (i = 0; i < fp->nr_rates; i++) {
605 if (fp->rate_table[i] == rate) {
606 score++;
607 break;
608 }
609 }
610 if (!score) {
611 dev_dbg(&subs->dev->dev,
612 "%s: (fmt @%p) no match for rate %d\n", __func__,
613 fp, rate);
614 return 0;
615 }
616
617 if (fp->channels == match->channels)
618 score++;
619
620 dev_dbg(&subs->dev->dev,
621 "%s: (fmt @%p) score %d\n", __func__, fp, score);
622
623 return score;
624 }
625
626 /*
627 * Configure the sync ep using the rate and pcm format of the data ep.
628 */
629 static int configure_sync_endpoint(struct snd_usb_substream *subs)
630 {
631 int ret;
632 struct audioformat *fp;
633 struct audioformat *sync_fp = NULL;
634 int cur_score = 0;
635 int sync_period_bytes = subs->period_bytes;
636 struct snd_usb_substream *sync_subs =
637 &subs->stream->substream[subs->direction ^ 1];
638
639 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
640 !subs->stream)
641 return snd_usb_endpoint_set_params(subs->sync_endpoint,
642 subs->pcm_format,
643 subs->channels,
644 subs->period_bytes,
645 0, 0,
646 subs->cur_rate,
647 subs->cur_audiofmt,
648 NULL);
649
650 /* Try to find the best matching audioformat. */
651 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
652 int score = match_endpoint_audioformats(subs,
653 fp, subs->cur_audiofmt,
654 subs->cur_rate, subs->pcm_format);
655
656 if (score > cur_score) {
657 sync_fp = fp;
658 cur_score = score;
659 }
660 }
661
662 if (unlikely(sync_fp == NULL)) {
663 dev_err(&subs->dev->dev,
664 "%s: no valid audioformat for sync ep %x found\n",
665 __func__, sync_subs->ep_num);
666 return -EINVAL;
667 }
668
669 /*
670 * Recalculate the period bytes if channel number differ between
671 * data and sync ep audioformat.
672 */
673 if (sync_fp->channels != subs->channels) {
674 sync_period_bytes = (subs->period_bytes / subs->channels) *
675 sync_fp->channels;
676 dev_dbg(&subs->dev->dev,
677 "%s: adjusted sync ep period bytes (%d -> %d)\n",
678 __func__, subs->period_bytes, sync_period_bytes);
679 }
680
681 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
682 subs->pcm_format,
683 sync_fp->channels,
684 sync_period_bytes,
685 0, 0,
686 subs->cur_rate,
687 sync_fp,
688 NULL);
689
690 return ret;
691 }
692
693 /*
694 * configure endpoint params
695 *
696 * called during initial setup and upon resume
697 */
698 static int configure_endpoint(struct snd_usb_substream *subs)
699 {
700 int ret;
701
702 /* format changed */
703 stop_endpoints(subs, true);
704 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
705 subs->pcm_format,
706 subs->channels,
707 subs->period_bytes,
708 subs->period_frames,
709 subs->buffer_periods,
710 subs->cur_rate,
711 subs->cur_audiofmt,
712 subs->sync_endpoint);
713 if (ret < 0)
714 return ret;
715
716 if (subs->sync_endpoint)
717 ret = configure_sync_endpoint(subs);
718
719 return ret;
720 }
721
722 /*
723 * hw_params callback
724 *
725 * allocate a buffer and set the given audio format.
726 *
727 * so far we use a physically linear buffer although packetize transfer
728 * doesn't need a continuous area.
729 * if sg buffer is supported on the later version of alsa, we'll follow
730 * that.
731 */
732 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
733 struct snd_pcm_hw_params *hw_params)
734 {
735 struct snd_usb_substream *subs = substream->runtime->private_data;
736 struct audioformat *fmt;
737 int ret;
738
739 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
740 params_buffer_bytes(hw_params));
741 if (ret < 0)
742 return ret;
743
744 subs->pcm_format = params_format(hw_params);
745 subs->period_bytes = params_period_bytes(hw_params);
746 subs->period_frames = params_period_size(hw_params);
747 subs->buffer_periods = params_periods(hw_params);
748 subs->channels = params_channels(hw_params);
749 subs->cur_rate = params_rate(hw_params);
750
751 fmt = find_format(subs);
752 if (!fmt) {
753 dev_dbg(&subs->dev->dev,
754 "cannot set format: format = %#x, rate = %d, channels = %d\n",
755 subs->pcm_format, subs->cur_rate, subs->channels);
756 return -EINVAL;
757 }
758
759 ret = snd_usb_lock_shutdown(subs->stream->chip);
760 if (ret < 0)
761 return ret;
762 ret = set_format(subs, fmt);
763 snd_usb_unlock_shutdown(subs->stream->chip);
764 if (ret < 0)
765 return ret;
766
767 subs->interface = fmt->iface;
768 subs->altset_idx = fmt->altset_idx;
769 subs->need_setup_ep = true;
770
771 return 0;
772 }
773
774 /*
775 * hw_free callback
776 *
777 * reset the audio format and release the buffer
778 */
779 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
780 {
781 struct snd_usb_substream *subs = substream->runtime->private_data;
782
783 subs->cur_audiofmt = NULL;
784 subs->cur_rate = 0;
785 subs->period_bytes = 0;
786 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
787 stop_endpoints(subs, true);
788 snd_usb_endpoint_deactivate(subs->sync_endpoint);
789 snd_usb_endpoint_deactivate(subs->data_endpoint);
790 snd_usb_unlock_shutdown(subs->stream->chip);
791 }
792 return snd_pcm_lib_free_vmalloc_buffer(substream);
793 }
794
795 /*
796 * prepare callback
797 *
798 * only a few subtle things...
799 */
800 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
801 {
802 struct snd_pcm_runtime *runtime = substream->runtime;
803 struct snd_usb_substream *subs = runtime->private_data;
804 struct usb_host_interface *alts;
805 struct usb_interface *iface;
806 int ret;
807
808 if (! subs->cur_audiofmt) {
809 dev_err(&subs->dev->dev, "no format is specified!\n");
810 return -ENXIO;
811 }
812
813 ret = snd_usb_lock_shutdown(subs->stream->chip);
814 if (ret < 0)
815 return ret;
816 if (snd_BUG_ON(!subs->data_endpoint)) {
817 ret = -EIO;
818 goto unlock;
819 }
820
821 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
822 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
823
824 ret = set_format(subs, subs->cur_audiofmt);
825 if (ret < 0)
826 goto unlock;
827
828 if (subs->need_setup_ep) {
829
830 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
831 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
832 ret = snd_usb_init_sample_rate(subs->stream->chip,
833 subs->cur_audiofmt->iface,
834 alts,
835 subs->cur_audiofmt,
836 subs->cur_rate);
837 if (ret < 0)
838 goto unlock;
839
840 ret = configure_endpoint(subs);
841 if (ret < 0)
842 goto unlock;
843 subs->need_setup_ep = false;
844 }
845
846 /* some unit conversions in runtime */
847 subs->data_endpoint->maxframesize =
848 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
849 subs->data_endpoint->curframesize =
850 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
851
852 /* reset the pointer */
853 subs->hwptr_done = 0;
854 subs->transfer_done = 0;
855 subs->last_delay = 0;
856 subs->last_frame_number = 0;
857 runtime->delay = 0;
858
859 /* for playback, submit the URBs now; otherwise, the first hwptr_done
860 * updates for all URBs would happen at the same time when starting */
861 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
862 ret = start_endpoints(subs);
863
864 unlock:
865 snd_usb_unlock_shutdown(subs->stream->chip);
866 return ret;
867 }
868
869 static const struct snd_pcm_hardware snd_usb_hardware =
870 {
871 .info = SNDRV_PCM_INFO_MMAP |
872 SNDRV_PCM_INFO_MMAP_VALID |
873 SNDRV_PCM_INFO_BATCH |
874 SNDRV_PCM_INFO_INTERLEAVED |
875 SNDRV_PCM_INFO_BLOCK_TRANSFER |
876 SNDRV_PCM_INFO_PAUSE,
877 .buffer_bytes_max = 1024 * 1024,
878 .period_bytes_min = 64,
879 .period_bytes_max = 512 * 1024,
880 .periods_min = 2,
881 .periods_max = 1024,
882 };
883
884 static int hw_check_valid_format(struct snd_usb_substream *subs,
885 struct snd_pcm_hw_params *params,
886 struct audioformat *fp)
887 {
888 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
889 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
890 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
891 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
892 struct snd_mask check_fmts;
893 unsigned int ptime;
894
895 /* check the format */
896 snd_mask_none(&check_fmts);
897 check_fmts.bits[0] = (u32)fp->formats;
898 check_fmts.bits[1] = (u32)(fp->formats >> 32);
899 snd_mask_intersect(&check_fmts, fmts);
900 if (snd_mask_empty(&check_fmts)) {
901 hwc_debug(" > check: no supported format %d\n", fp->format);
902 return 0;
903 }
904 /* check the channels */
905 if (fp->channels < ct->min || fp->channels > ct->max) {
906 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
907 return 0;
908 }
909 /* check the rate is within the range */
910 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
911 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
912 return 0;
913 }
914 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
915 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
916 return 0;
917 }
918 /* check whether the period time is >= the data packet interval */
919 if (subs->speed != USB_SPEED_FULL) {
920 ptime = 125 * (1 << fp->datainterval);
921 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
922 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
923 return 0;
924 }
925 }
926 return 1;
927 }
928
929 static int hw_rule_rate(struct snd_pcm_hw_params *params,
930 struct snd_pcm_hw_rule *rule)
931 {
932 struct snd_usb_substream *subs = rule->private;
933 struct audioformat *fp;
934 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
935 unsigned int rmin, rmax;
936 int changed;
937
938 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
939 changed = 0;
940 rmin = rmax = 0;
941 list_for_each_entry(fp, &subs->fmt_list, list) {
942 if (!hw_check_valid_format(subs, params, fp))
943 continue;
944 if (changed++) {
945 if (rmin > fp->rate_min)
946 rmin = fp->rate_min;
947 if (rmax < fp->rate_max)
948 rmax = fp->rate_max;
949 } else {
950 rmin = fp->rate_min;
951 rmax = fp->rate_max;
952 }
953 }
954
955 if (!changed) {
956 hwc_debug(" --> get empty\n");
957 it->empty = 1;
958 return -EINVAL;
959 }
960
961 changed = 0;
962 if (it->min < rmin) {
963 it->min = rmin;
964 it->openmin = 0;
965 changed = 1;
966 }
967 if (it->max > rmax) {
968 it->max = rmax;
969 it->openmax = 0;
970 changed = 1;
971 }
972 if (snd_interval_checkempty(it)) {
973 it->empty = 1;
974 return -EINVAL;
975 }
976 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
977 return changed;
978 }
979
980
981 static int hw_rule_channels(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_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
987 unsigned int rmin, rmax;
988 int changed;
989
990 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
991 changed = 0;
992 rmin = rmax = 0;
993 list_for_each_entry(fp, &subs->fmt_list, list) {
994 if (!hw_check_valid_format(subs, params, fp))
995 continue;
996 if (changed++) {
997 if (rmin > fp->channels)
998 rmin = fp->channels;
999 if (rmax < fp->channels)
1000 rmax = fp->channels;
1001 } else {
1002 rmin = fp->channels;
1003 rmax = fp->channels;
1004 }
1005 }
1006
1007 if (!changed) {
1008 hwc_debug(" --> get empty\n");
1009 it->empty = 1;
1010 return -EINVAL;
1011 }
1012
1013 changed = 0;
1014 if (it->min < rmin) {
1015 it->min = rmin;
1016 it->openmin = 0;
1017 changed = 1;
1018 }
1019 if (it->max > rmax) {
1020 it->max = rmax;
1021 it->openmax = 0;
1022 changed = 1;
1023 }
1024 if (snd_interval_checkempty(it)) {
1025 it->empty = 1;
1026 return -EINVAL;
1027 }
1028 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1029 return changed;
1030 }
1031
1032 static int hw_rule_format(struct snd_pcm_hw_params *params,
1033 struct snd_pcm_hw_rule *rule)
1034 {
1035 struct snd_usb_substream *subs = rule->private;
1036 struct audioformat *fp;
1037 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1038 u64 fbits;
1039 u32 oldbits[2];
1040 int changed;
1041
1042 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1043 fbits = 0;
1044 list_for_each_entry(fp, &subs->fmt_list, list) {
1045 if (!hw_check_valid_format(subs, params, fp))
1046 continue;
1047 fbits |= fp->formats;
1048 }
1049
1050 oldbits[0] = fmt->bits[0];
1051 oldbits[1] = fmt->bits[1];
1052 fmt->bits[0] &= (u32)fbits;
1053 fmt->bits[1] &= (u32)(fbits >> 32);
1054 if (!fmt->bits[0] && !fmt->bits[1]) {
1055 hwc_debug(" --> get empty\n");
1056 return -EINVAL;
1057 }
1058 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1059 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1060 return changed;
1061 }
1062
1063 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1064 struct snd_pcm_hw_rule *rule)
1065 {
1066 struct snd_usb_substream *subs = rule->private;
1067 struct audioformat *fp;
1068 struct snd_interval *it;
1069 unsigned char min_datainterval;
1070 unsigned int pmin;
1071 int changed;
1072
1073 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1074 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1075 min_datainterval = 0xff;
1076 list_for_each_entry(fp, &subs->fmt_list, list) {
1077 if (!hw_check_valid_format(subs, params, fp))
1078 continue;
1079 min_datainterval = min(min_datainterval, fp->datainterval);
1080 }
1081 if (min_datainterval == 0xff) {
1082 hwc_debug(" --> get empty\n");
1083 it->empty = 1;
1084 return -EINVAL;
1085 }
1086 pmin = 125 * (1 << min_datainterval);
1087 changed = 0;
1088 if (it->min < pmin) {
1089 it->min = pmin;
1090 it->openmin = 0;
1091 changed = 1;
1092 }
1093 if (snd_interval_checkempty(it)) {
1094 it->empty = 1;
1095 return -EINVAL;
1096 }
1097 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1098 return changed;
1099 }
1100
1101 /*
1102 * If the device supports unusual bit rates, does the request meet these?
1103 */
1104 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1105 struct snd_usb_substream *subs)
1106 {
1107 struct audioformat *fp;
1108 int *rate_list;
1109 int count = 0, needs_knot = 0;
1110 int err;
1111
1112 kfree(subs->rate_list.list);
1113 subs->rate_list.list = NULL;
1114
1115 list_for_each_entry(fp, &subs->fmt_list, list) {
1116 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1117 return 0;
1118 count += fp->nr_rates;
1119 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1120 needs_knot = 1;
1121 }
1122 if (!needs_knot)
1123 return 0;
1124
1125 subs->rate_list.list = rate_list =
1126 kmalloc(sizeof(int) * count, GFP_KERNEL);
1127 if (!subs->rate_list.list)
1128 return -ENOMEM;
1129 subs->rate_list.count = count;
1130 subs->rate_list.mask = 0;
1131 count = 0;
1132 list_for_each_entry(fp, &subs->fmt_list, list) {
1133 int i;
1134 for (i = 0; i < fp->nr_rates; i++)
1135 rate_list[count++] = fp->rate_table[i];
1136 }
1137 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1138 &subs->rate_list);
1139 if (err < 0)
1140 return err;
1141
1142 return 0;
1143 }
1144
1145
1146 /*
1147 * set up the runtime hardware information.
1148 */
1149
1150 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1151 {
1152 struct audioformat *fp;
1153 unsigned int pt, ptmin;
1154 int param_period_time_if_needed;
1155 int err;
1156
1157 runtime->hw.formats = subs->formats;
1158
1159 runtime->hw.rate_min = 0x7fffffff;
1160 runtime->hw.rate_max = 0;
1161 runtime->hw.channels_min = 256;
1162 runtime->hw.channels_max = 0;
1163 runtime->hw.rates = 0;
1164 ptmin = UINT_MAX;
1165 /* check min/max rates and channels */
1166 list_for_each_entry(fp, &subs->fmt_list, list) {
1167 runtime->hw.rates |= fp->rates;
1168 if (runtime->hw.rate_min > fp->rate_min)
1169 runtime->hw.rate_min = fp->rate_min;
1170 if (runtime->hw.rate_max < fp->rate_max)
1171 runtime->hw.rate_max = fp->rate_max;
1172 if (runtime->hw.channels_min > fp->channels)
1173 runtime->hw.channels_min = fp->channels;
1174 if (runtime->hw.channels_max < fp->channels)
1175 runtime->hw.channels_max = fp->channels;
1176 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1177 /* FIXME: there might be more than one audio formats... */
1178 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1179 fp->frame_size;
1180 }
1181 pt = 125 * (1 << fp->datainterval);
1182 ptmin = min(ptmin, pt);
1183 }
1184 err = snd_usb_autoresume(subs->stream->chip);
1185 if (err < 0)
1186 return err;
1187
1188 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1189 if (subs->speed == USB_SPEED_FULL)
1190 /* full speed devices have fixed data packet interval */
1191 ptmin = 1000;
1192 if (ptmin == 1000)
1193 /* if period time doesn't go below 1 ms, no rules needed */
1194 param_period_time_if_needed = -1;
1195 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1196 ptmin, UINT_MAX);
1197
1198 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1199 hw_rule_rate, subs,
1200 SNDRV_PCM_HW_PARAM_FORMAT,
1201 SNDRV_PCM_HW_PARAM_CHANNELS,
1202 param_period_time_if_needed,
1203 -1)) < 0)
1204 goto rep_err;
1205 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1206 hw_rule_channels, subs,
1207 SNDRV_PCM_HW_PARAM_FORMAT,
1208 SNDRV_PCM_HW_PARAM_RATE,
1209 param_period_time_if_needed,
1210 -1)) < 0)
1211 goto rep_err;
1212 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1213 hw_rule_format, subs,
1214 SNDRV_PCM_HW_PARAM_RATE,
1215 SNDRV_PCM_HW_PARAM_CHANNELS,
1216 param_period_time_if_needed,
1217 -1)) < 0)
1218 goto rep_err;
1219 if (param_period_time_if_needed >= 0) {
1220 err = snd_pcm_hw_rule_add(runtime, 0,
1221 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1222 hw_rule_period_time, subs,
1223 SNDRV_PCM_HW_PARAM_FORMAT,
1224 SNDRV_PCM_HW_PARAM_CHANNELS,
1225 SNDRV_PCM_HW_PARAM_RATE,
1226 -1);
1227 if (err < 0)
1228 goto rep_err;
1229 }
1230 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1231 goto rep_err;
1232 return 0;
1233
1234 rep_err:
1235 snd_usb_autosuspend(subs->stream->chip);
1236 return err;
1237 }
1238
1239 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1240 {
1241 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1242 struct snd_pcm_runtime *runtime = substream->runtime;
1243 struct snd_usb_substream *subs = &as->substream[direction];
1244
1245 subs->interface = -1;
1246 subs->altset_idx = 0;
1247 runtime->hw = snd_usb_hardware;
1248 runtime->private_data = subs;
1249 subs->pcm_substream = substream;
1250 /* runtime PM is also done there */
1251
1252 /* initialize DSD/DOP context */
1253 subs->dsd_dop.byte_idx = 0;
1254 subs->dsd_dop.channel = 0;
1255 subs->dsd_dop.marker = 1;
1256
1257 return setup_hw_info(runtime, subs);
1258 }
1259
1260 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1261 {
1262 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1263 struct snd_usb_substream *subs = &as->substream[direction];
1264
1265 stop_endpoints(subs, true);
1266
1267 if (subs->interface >= 0 &&
1268 !snd_usb_lock_shutdown(subs->stream->chip)) {
1269 usb_set_interface(subs->dev, subs->interface, 0);
1270 subs->interface = -1;
1271 snd_usb_unlock_shutdown(subs->stream->chip);
1272 }
1273
1274 subs->pcm_substream = NULL;
1275 snd_usb_autosuspend(subs->stream->chip);
1276
1277 return 0;
1278 }
1279
1280 /* Since a URB can handle only a single linear buffer, we must use double
1281 * buffering when the data to be transferred overflows the buffer boundary.
1282 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1283 * for all URBs.
1284 */
1285 static void retire_capture_urb(struct snd_usb_substream *subs,
1286 struct urb *urb)
1287 {
1288 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1289 unsigned int stride, frames, bytes, oldptr;
1290 int i, period_elapsed = 0;
1291 unsigned long flags;
1292 unsigned char *cp;
1293 int current_frame_number;
1294
1295 /* read frame number here, update pointer in critical section */
1296 current_frame_number = usb_get_current_frame_number(subs->dev);
1297
1298 stride = runtime->frame_bits >> 3;
1299
1300 for (i = 0; i < urb->number_of_packets; i++) {
1301 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1302 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1303 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1304 i, urb->iso_frame_desc[i].status);
1305 // continue;
1306 }
1307 bytes = urb->iso_frame_desc[i].actual_length;
1308 frames = bytes / stride;
1309 if (!subs->txfr_quirk)
1310 bytes = frames * stride;
1311 if (bytes % (runtime->sample_bits >> 3) != 0) {
1312 int oldbytes = bytes;
1313 bytes = frames * stride;
1314 dev_warn(&subs->dev->dev,
1315 "Corrected urb data len. %d->%d\n",
1316 oldbytes, bytes);
1317 }
1318 /* update the current pointer */
1319 spin_lock_irqsave(&subs->lock, flags);
1320 oldptr = subs->hwptr_done;
1321 subs->hwptr_done += bytes;
1322 if (subs->hwptr_done >= runtime->buffer_size * stride)
1323 subs->hwptr_done -= runtime->buffer_size * stride;
1324 frames = (bytes + (oldptr % stride)) / stride;
1325 subs->transfer_done += frames;
1326 if (subs->transfer_done >= runtime->period_size) {
1327 subs->transfer_done -= runtime->period_size;
1328 period_elapsed = 1;
1329 }
1330 /* capture delay is by construction limited to one URB,
1331 * reset delays here
1332 */
1333 runtime->delay = subs->last_delay = 0;
1334
1335 /* realign last_frame_number */
1336 subs->last_frame_number = current_frame_number;
1337 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1338
1339 spin_unlock_irqrestore(&subs->lock, flags);
1340 /* copy a data chunk */
1341 if (oldptr + bytes > runtime->buffer_size * stride) {
1342 unsigned int bytes1 =
1343 runtime->buffer_size * stride - oldptr;
1344 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1345 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1346 } else {
1347 memcpy(runtime->dma_area + oldptr, cp, bytes);
1348 }
1349 }
1350
1351 if (period_elapsed)
1352 snd_pcm_period_elapsed(subs->pcm_substream);
1353 }
1354
1355 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1356 struct urb *urb, unsigned int bytes)
1357 {
1358 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1359 unsigned int stride = runtime->frame_bits >> 3;
1360 unsigned int dst_idx = 0;
1361 unsigned int src_idx = subs->hwptr_done;
1362 unsigned int wrap = runtime->buffer_size * stride;
1363 u8 *dst = urb->transfer_buffer;
1364 u8 *src = runtime->dma_area;
1365 u8 marker[] = { 0x05, 0xfa };
1366
1367 /*
1368 * The DSP DOP format defines a way to transport DSD samples over
1369 * normal PCM data endpoints. It requires stuffing of marker bytes
1370 * (0x05 and 0xfa, alternating per sample frame), and then expects
1371 * 2 additional bytes of actual payload. The whole frame is stored
1372 * LSB.
1373 *
1374 * Hence, for a stereo transport, the buffer layout looks like this,
1375 * where L refers to left channel samples and R to right.
1376 *
1377 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1378 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1379 * .....
1380 *
1381 */
1382
1383 while (bytes--) {
1384 if (++subs->dsd_dop.byte_idx == 3) {
1385 /* frame boundary? */
1386 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1387 src_idx += 2;
1388 subs->dsd_dop.byte_idx = 0;
1389
1390 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1391 /* alternate the marker */
1392 subs->dsd_dop.marker++;
1393 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1394 subs->dsd_dop.channel = 0;
1395 }
1396 } else {
1397 /* stuff the DSD payload */
1398 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1399
1400 if (subs->cur_audiofmt->dsd_bitrev)
1401 dst[dst_idx++] = bitrev8(src[idx]);
1402 else
1403 dst[dst_idx++] = src[idx];
1404
1405 subs->hwptr_done++;
1406 }
1407 }
1408 if (subs->hwptr_done >= runtime->buffer_size * stride)
1409 subs->hwptr_done -= runtime->buffer_size * stride;
1410 }
1411
1412 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1413 int offset, int stride, unsigned int bytes)
1414 {
1415 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1416
1417 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1418 /* err, the transferred area goes over buffer boundary. */
1419 unsigned int bytes1 =
1420 runtime->buffer_size * stride - subs->hwptr_done;
1421 memcpy(urb->transfer_buffer + offset,
1422 runtime->dma_area + subs->hwptr_done, bytes1);
1423 memcpy(urb->transfer_buffer + offset + bytes1,
1424 runtime->dma_area, bytes - bytes1);
1425 } else {
1426 memcpy(urb->transfer_buffer + offset,
1427 runtime->dma_area + subs->hwptr_done, bytes);
1428 }
1429 subs->hwptr_done += bytes;
1430 if (subs->hwptr_done >= runtime->buffer_size * stride)
1431 subs->hwptr_done -= runtime->buffer_size * stride;
1432 }
1433
1434 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1435 struct urb *urb, int stride,
1436 unsigned int bytes)
1437 {
1438 __le32 packet_length;
1439 int i;
1440
1441 /* Put __le32 length descriptor at start of each packet. */
1442 for (i = 0; i < urb->number_of_packets; i++) {
1443 unsigned int length = urb->iso_frame_desc[i].length;
1444 unsigned int offset = urb->iso_frame_desc[i].offset;
1445
1446 packet_length = cpu_to_le32(length);
1447 offset += i * sizeof(packet_length);
1448 urb->iso_frame_desc[i].offset = offset;
1449 urb->iso_frame_desc[i].length += sizeof(packet_length);
1450 memcpy(urb->transfer_buffer + offset,
1451 &packet_length, sizeof(packet_length));
1452 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1453 stride, length);
1454 }
1455 /* Adjust transfer size accordingly. */
1456 bytes += urb->number_of_packets * sizeof(packet_length);
1457 return bytes;
1458 }
1459
1460 static void prepare_playback_urb(struct snd_usb_substream *subs,
1461 struct urb *urb)
1462 {
1463 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1464 struct snd_usb_endpoint *ep = subs->data_endpoint;
1465 struct snd_urb_ctx *ctx = urb->context;
1466 unsigned int counts, frames, bytes;
1467 int i, stride, period_elapsed = 0;
1468 unsigned long flags;
1469
1470 stride = runtime->frame_bits >> 3;
1471
1472 frames = 0;
1473 urb->number_of_packets = 0;
1474 spin_lock_irqsave(&subs->lock, flags);
1475 subs->frame_limit += ep->max_urb_frames;
1476 for (i = 0; i < ctx->packets; i++) {
1477 if (ctx->packet_size[i])
1478 counts = ctx->packet_size[i];
1479 else
1480 counts = snd_usb_endpoint_next_packet_size(ep);
1481
1482 /* set up descriptor */
1483 urb->iso_frame_desc[i].offset = frames * ep->stride;
1484 urb->iso_frame_desc[i].length = counts * ep->stride;
1485 frames += counts;
1486 urb->number_of_packets++;
1487 subs->transfer_done += counts;
1488 if (subs->transfer_done >= runtime->period_size) {
1489 subs->transfer_done -= runtime->period_size;
1490 subs->frame_limit = 0;
1491 period_elapsed = 1;
1492 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1493 if (subs->transfer_done > 0) {
1494 /* FIXME: fill-max mode is not
1495 * supported yet */
1496 frames -= subs->transfer_done;
1497 counts -= subs->transfer_done;
1498 urb->iso_frame_desc[i].length =
1499 counts * ep->stride;
1500 subs->transfer_done = 0;
1501 }
1502 i++;
1503 if (i < ctx->packets) {
1504 /* add a transfer delimiter */
1505 urb->iso_frame_desc[i].offset =
1506 frames * ep->stride;
1507 urb->iso_frame_desc[i].length = 0;
1508 urb->number_of_packets++;
1509 }
1510 break;
1511 }
1512 }
1513 /* finish at the period boundary or after enough frames */
1514 if ((period_elapsed ||
1515 subs->transfer_done >= subs->frame_limit) &&
1516 !snd_usb_endpoint_implicit_feedback_sink(ep))
1517 break;
1518 }
1519 bytes = frames * ep->stride;
1520
1521 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1522 subs->cur_audiofmt->dsd_dop)) {
1523 fill_playback_urb_dsd_dop(subs, urb, bytes);
1524 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1525 subs->cur_audiofmt->dsd_bitrev)) {
1526 /* bit-reverse the bytes */
1527 u8 *buf = urb->transfer_buffer;
1528 for (i = 0; i < bytes; i++) {
1529 int idx = (subs->hwptr_done + i)
1530 % (runtime->buffer_size * stride);
1531 buf[i] = bitrev8(runtime->dma_area[idx]);
1532 }
1533
1534 subs->hwptr_done += bytes;
1535 if (subs->hwptr_done >= runtime->buffer_size * stride)
1536 subs->hwptr_done -= runtime->buffer_size * stride;
1537 } else {
1538 /* usual PCM */
1539 if (!subs->tx_length_quirk)
1540 copy_to_urb(subs, urb, 0, stride, bytes);
1541 else
1542 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1543 /* bytes is now amount of outgoing data */
1544 }
1545
1546 /* update delay with exact number of samples queued */
1547 runtime->delay = subs->last_delay;
1548 runtime->delay += frames;
1549 subs->last_delay = runtime->delay;
1550
1551 /* realign last_frame_number */
1552 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1553 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1554
1555 if (subs->trigger_tstamp_pending_update) {
1556 /* this is the first actual URB submitted,
1557 * update trigger timestamp to reflect actual start time
1558 */
1559 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1560 subs->trigger_tstamp_pending_update = false;
1561 }
1562
1563 spin_unlock_irqrestore(&subs->lock, flags);
1564 urb->transfer_buffer_length = bytes;
1565 if (period_elapsed)
1566 snd_pcm_period_elapsed(subs->pcm_substream);
1567 }
1568
1569 /*
1570 * process after playback data complete
1571 * - decrease the delay count again
1572 */
1573 static void retire_playback_urb(struct snd_usb_substream *subs,
1574 struct urb *urb)
1575 {
1576 unsigned long flags;
1577 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1578 struct snd_usb_endpoint *ep = subs->data_endpoint;
1579 int processed = urb->transfer_buffer_length / ep->stride;
1580 int est_delay;
1581
1582 /* ignore the delay accounting when procssed=0 is given, i.e.
1583 * silent payloads are procssed before handling the actual data
1584 */
1585 if (!processed)
1586 return;
1587
1588 spin_lock_irqsave(&subs->lock, flags);
1589 if (!subs->last_delay)
1590 goto out; /* short path */
1591
1592 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1593 /* update delay with exact number of samples played */
1594 if (processed > subs->last_delay)
1595 subs->last_delay = 0;
1596 else
1597 subs->last_delay -= processed;
1598 runtime->delay = subs->last_delay;
1599
1600 /*
1601 * Report when delay estimate is off by more than 2ms.
1602 * The error should be lower than 2ms since the estimate relies
1603 * on two reads of a counter updated every ms.
1604 */
1605 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1606 dev_dbg_ratelimited(&subs->dev->dev,
1607 "delay: estimated %d, actual %d\n",
1608 est_delay, subs->last_delay);
1609
1610 if (!subs->running) {
1611 /* update last_frame_number for delay counting here since
1612 * prepare_playback_urb won't be called during pause
1613 */
1614 subs->last_frame_number =
1615 usb_get_current_frame_number(subs->dev) & 0xff;
1616 }
1617
1618 out:
1619 spin_unlock_irqrestore(&subs->lock, flags);
1620 }
1621
1622 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1623 {
1624 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1625 }
1626
1627 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1628 {
1629 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1630 }
1631
1632 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1633 {
1634 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1635 }
1636
1637 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1638 {
1639 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1640 }
1641
1642 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1643 int cmd)
1644 {
1645 struct snd_usb_substream *subs = substream->runtime->private_data;
1646
1647 switch (cmd) {
1648 case SNDRV_PCM_TRIGGER_START:
1649 subs->trigger_tstamp_pending_update = true;
1650 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1651 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1652 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1653 subs->running = 1;
1654 return 0;
1655 case SNDRV_PCM_TRIGGER_STOP:
1656 stop_endpoints(subs, false);
1657 subs->running = 0;
1658 return 0;
1659 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1660 subs->data_endpoint->prepare_data_urb = NULL;
1661 /* keep retire_data_urb for delay calculation */
1662 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1663 subs->running = 0;
1664 return 0;
1665 }
1666
1667 return -EINVAL;
1668 }
1669
1670 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1671 int cmd)
1672 {
1673 int err;
1674 struct snd_usb_substream *subs = substream->runtime->private_data;
1675
1676 switch (cmd) {
1677 case SNDRV_PCM_TRIGGER_START:
1678 err = start_endpoints(subs);
1679 if (err < 0)
1680 return err;
1681
1682 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1683 subs->running = 1;
1684 return 0;
1685 case SNDRV_PCM_TRIGGER_STOP:
1686 stop_endpoints(subs, false);
1687 subs->running = 0;
1688 return 0;
1689 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1690 subs->data_endpoint->retire_data_urb = NULL;
1691 subs->running = 0;
1692 return 0;
1693 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1694 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1695 subs->running = 1;
1696 return 0;
1697 }
1698
1699 return -EINVAL;
1700 }
1701
1702 static const struct snd_pcm_ops snd_usb_playback_ops = {
1703 .open = snd_usb_playback_open,
1704 .close = snd_usb_playback_close,
1705 .ioctl = snd_pcm_lib_ioctl,
1706 .hw_params = snd_usb_hw_params,
1707 .hw_free = snd_usb_hw_free,
1708 .prepare = snd_usb_pcm_prepare,
1709 .trigger = snd_usb_substream_playback_trigger,
1710 .pointer = snd_usb_pcm_pointer,
1711 .page = snd_pcm_lib_get_vmalloc_page,
1712 .mmap = snd_pcm_lib_mmap_vmalloc,
1713 };
1714
1715 static const struct snd_pcm_ops snd_usb_capture_ops = {
1716 .open = snd_usb_capture_open,
1717 .close = snd_usb_capture_close,
1718 .ioctl = snd_pcm_lib_ioctl,
1719 .hw_params = snd_usb_hw_params,
1720 .hw_free = snd_usb_hw_free,
1721 .prepare = snd_usb_pcm_prepare,
1722 .trigger = snd_usb_substream_capture_trigger,
1723 .pointer = snd_usb_pcm_pointer,
1724 .page = snd_pcm_lib_get_vmalloc_page,
1725 .mmap = snd_pcm_lib_mmap_vmalloc,
1726 };
1727
1728 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1729 {
1730 snd_pcm_set_ops(pcm, stream,
1731 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1732 &snd_usb_playback_ops : &snd_usb_capture_ops);
1733 }
Linux with added FPC-III support