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Merge tag 'for-linus-20180610' of git://git.kernel.dk/linux-block
[mirror_ubuntu-hirsute-kernel.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 = substream->runtime->private_data;
80 unsigned int hwptr_done;
81
82 if (atomic_read(&subs->stream->chip->shutdown))
83 return SNDRV_PCM_POS_XRUN;
84 spin_lock(&subs->lock);
85 hwptr_done = subs->hwptr_done;
86 substream->runtime->delay = snd_usb_pcm_delay(subs,
87 substream->runtime->rate);
88 spin_unlock(&subs->lock);
89 return hwptr_done / (substream->runtime->frame_bits >> 3);
90 }
91
92 /*
93 * find a matching audio format
94 */
95 static struct audioformat *find_format(struct snd_usb_substream *subs)
96 {
97 struct audioformat *fp;
98 struct audioformat *found = NULL;
99 int cur_attr = 0, attr;
100
101 list_for_each_entry(fp, &subs->fmt_list, list) {
102 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
103 continue;
104 if (fp->channels != subs->channels)
105 continue;
106 if (subs->cur_rate < fp->rate_min ||
107 subs->cur_rate > fp->rate_max)
108 continue;
109 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
110 unsigned int i;
111 for (i = 0; i < fp->nr_rates; i++)
112 if (fp->rate_table[i] == subs->cur_rate)
113 break;
114 if (i >= fp->nr_rates)
115 continue;
116 }
117 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
118 if (! found) {
119 found = fp;
120 cur_attr = attr;
121 continue;
122 }
123 /* avoid async out and adaptive in if the other method
124 * supports the same format.
125 * this is a workaround for the case like
126 * M-audio audiophile USB.
127 */
128 if (attr != cur_attr) {
129 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
130 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
131 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
132 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
133 continue;
134 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
135 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
136 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
137 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
138 found = fp;
139 cur_attr = attr;
140 continue;
141 }
142 }
143 /* find the format with the largest max. packet size */
144 if (fp->maxpacksize > found->maxpacksize) {
145 found = fp;
146 cur_attr = attr;
147 }
148 }
149 return found;
150 }
151
152 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
153 struct usb_host_interface *alts,
154 struct audioformat *fmt)
155 {
156 struct usb_device *dev = chip->dev;
157 unsigned int ep;
158 unsigned char data[1];
159 int err;
160
161 if (get_iface_desc(alts)->bNumEndpoints < 1)
162 return -EINVAL;
163 ep = get_endpoint(alts, 0)->bEndpointAddress;
164
165 data[0] = 1;
166 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
167 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
168 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
169 data, sizeof(data));
170 if (err < 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 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));
192 if (err < 0) {
193 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
194 iface, fmt->altsetting);
195 return err;
196 }
197
198 return 0;
199 }
200
201 /*
202 * initialize the pitch control and sample rate
203 */
204 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
205 struct usb_host_interface *alts,
206 struct audioformat *fmt)
207 {
208 /* if endpoint doesn't have pitch control, bail out */
209 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
210 return 0;
211
212 switch (fmt->protocol) {
213 case UAC_VERSION_1:
214 default:
215 return init_pitch_v1(chip, iface, alts, fmt);
216
217 case UAC_VERSION_2:
218 return init_pitch_v2(chip, iface, alts, fmt);
219 }
220 }
221
222 static int start_endpoints(struct snd_usb_substream *subs)
223 {
224 int err;
225
226 if (!subs->data_endpoint)
227 return -EINVAL;
228
229 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
230 struct snd_usb_endpoint *ep = subs->data_endpoint;
231
232 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
233
234 ep->data_subs = subs;
235 err = snd_usb_endpoint_start(ep);
236 if (err < 0) {
237 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
238 return err;
239 }
240 }
241
242 if (subs->sync_endpoint &&
243 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
244 struct snd_usb_endpoint *ep = subs->sync_endpoint;
245
246 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
247 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
248 err = usb_set_interface(subs->dev,
249 subs->sync_endpoint->iface,
250 subs->sync_endpoint->altsetting);
251 if (err < 0) {
252 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
253 dev_err(&subs->dev->dev,
254 "%d:%d: cannot set interface (%d)\n",
255 subs->sync_endpoint->iface,
256 subs->sync_endpoint->altsetting, err);
257 return -EIO;
258 }
259 }
260
261 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
262
263 ep->sync_slave = subs->data_endpoint;
264 err = snd_usb_endpoint_start(ep);
265 if (err < 0) {
266 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
267 return err;
268 }
269 }
270
271 return 0;
272 }
273
274 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
275 {
276 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
277 snd_usb_endpoint_stop(subs->sync_endpoint);
278
279 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
280 snd_usb_endpoint_stop(subs->data_endpoint);
281
282 if (wait) {
283 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
284 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
285 }
286 }
287
288 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
289 unsigned int altsetting,
290 struct usb_host_interface **alts,
291 unsigned int *ep)
292 {
293 struct usb_interface *iface;
294 struct usb_interface_descriptor *altsd;
295 struct usb_endpoint_descriptor *epd;
296
297 iface = usb_ifnum_to_if(dev, ifnum);
298 if (!iface || iface->num_altsetting < altsetting + 1)
299 return -ENOENT;
300 *alts = &iface->altsetting[altsetting];
301 altsd = get_iface_desc(*alts);
302 if (altsd->bAlternateSetting != altsetting ||
303 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
304 (altsd->bInterfaceSubClass != 2 &&
305 altsd->bInterfaceProtocol != 2 ) ||
306 altsd->bNumEndpoints < 1)
307 return -ENOENT;
308 epd = get_endpoint(*alts, 0);
309 if (!usb_endpoint_is_isoc_in(epd) ||
310 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
311 USB_ENDPOINT_USAGE_IMPLICIT_FB)
312 return -ENOENT;
313 *ep = epd->bEndpointAddress;
314 return 0;
315 }
316
317 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
318 struct usb_device *dev,
319 struct usb_interface_descriptor *altsd,
320 unsigned int attr)
321 {
322 struct usb_host_interface *alts;
323 struct usb_interface *iface;
324 unsigned int ep;
325 unsigned int ifnum;
326
327 /* Implicit feedback sync EPs consumers are always playback EPs */
328 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
329 return 0;
330
331 switch (subs->stream->chip->usb_id) {
332 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
333 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
334 ep = 0x81;
335 ifnum = 3;
336 goto add_sync_ep_from_ifnum;
337 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
338 case USB_ID(0x0763, 0x2081):
339 ep = 0x81;
340 ifnum = 2;
341 goto add_sync_ep_from_ifnum;
342 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
343 ep = 0x86;
344 ifnum = 2;
345 goto add_sync_ep_from_ifnum;
346 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
347 ep = 0x81;
348 ifnum = 2;
349 goto add_sync_ep_from_ifnum;
350 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
351 ep = 0x81;
352 ifnum = 1;
353 goto add_sync_ep_from_ifnum;
354 }
355
356 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
357 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
358 altsd->bInterfaceProtocol == 2 &&
359 altsd->bNumEndpoints == 1 &&
360 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
361 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
362 altsd->bAlternateSetting,
363 &alts, &ep) >= 0) {
364 goto add_sync_ep;
365 }
366
367 /* No quirk */
368 return 0;
369
370 add_sync_ep_from_ifnum:
371 iface = usb_ifnum_to_if(dev, ifnum);
372
373 if (!iface || iface->num_altsetting == 0)
374 return -EINVAL;
375
376 alts = &iface->altsetting[1];
377
378 add_sync_ep:
379 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
380 alts, ep, !subs->direction,
381 SND_USB_ENDPOINT_TYPE_DATA);
382 if (!subs->sync_endpoint)
383 return -EINVAL;
384
385 subs->data_endpoint->sync_master = subs->sync_endpoint;
386
387 return 0;
388 }
389
390 static int set_sync_endpoint(struct snd_usb_substream *subs,
391 struct audioformat *fmt,
392 struct usb_device *dev,
393 struct usb_host_interface *alts,
394 struct usb_interface_descriptor *altsd)
395 {
396 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
397 unsigned int ep, attr;
398 bool implicit_fb;
399 int err;
400
401 /* we need a sync pipe in async OUT or adaptive IN mode */
402 /* check the number of EP, since some devices have broken
403 * descriptors which fool us. if it has only one EP,
404 * assume it as adaptive-out or sync-in.
405 */
406 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
407
408 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
409 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
410
411 /*
412 * In these modes the notion of sync_endpoint is irrelevant.
413 * Reset pointers to avoid using stale data from previously
414 * used settings, e.g. when configuration and endpoints were
415 * changed
416 */
417
418 subs->sync_endpoint = NULL;
419 subs->data_endpoint->sync_master = NULL;
420 }
421
422 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
423 if (err < 0)
424 return err;
425
426 if (altsd->bNumEndpoints < 2)
427 return 0;
428
429 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
430 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
431 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
432 return 0;
433
434 /*
435 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
436 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
437 * error fall back to SYNC mode and don't create sync endpoint
438 */
439
440 /* check sync-pipe endpoint */
441 /* ... and check descriptor size before accessing bSynchAddress
442 because there is a version of the SB Audigy 2 NX firmware lacking
443 the audio fields in the endpoint descriptors */
444 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
445 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
446 get_endpoint(alts, 1)->bSynchAddress != 0)) {
447 dev_err(&dev->dev,
448 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
449 fmt->iface, fmt->altsetting,
450 get_endpoint(alts, 1)->bmAttributes,
451 get_endpoint(alts, 1)->bLength,
452 get_endpoint(alts, 1)->bSynchAddress);
453 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
454 return 0;
455 return -EINVAL;
456 }
457 ep = get_endpoint(alts, 1)->bEndpointAddress;
458 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
459 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
460 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
461 dev_err(&dev->dev,
462 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
463 fmt->iface, fmt->altsetting,
464 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
465 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
466 return 0;
467 return -EINVAL;
468 }
469
470 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
471 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
472
473 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
474 alts, ep, !subs->direction,
475 implicit_fb ?
476 SND_USB_ENDPOINT_TYPE_DATA :
477 SND_USB_ENDPOINT_TYPE_SYNC);
478 if (!subs->sync_endpoint) {
479 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
480 return 0;
481 return -EINVAL;
482 }
483
484 subs->data_endpoint->sync_master = subs->sync_endpoint;
485
486 return 0;
487 }
488
489 /*
490 * find a matching format and set up the interface
491 */
492 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
493 {
494 struct usb_device *dev = subs->dev;
495 struct usb_host_interface *alts;
496 struct usb_interface_descriptor *altsd;
497 struct usb_interface *iface;
498 int err;
499
500 iface = usb_ifnum_to_if(dev, fmt->iface);
501 if (WARN_ON(!iface))
502 return -EINVAL;
503 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
504 altsd = get_iface_desc(alts);
505 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
506 return -EINVAL;
507
508 if (fmt == subs->cur_audiofmt)
509 return 0;
510
511 /* close the old interface */
512 if (subs->interface >= 0 && subs->interface != fmt->iface) {
513 if (!subs->stream->chip->keep_iface) {
514 err = usb_set_interface(subs->dev, subs->interface, 0);
515 if (err < 0) {
516 dev_err(&dev->dev,
517 "%d:%d: return to setting 0 failed (%d)\n",
518 fmt->iface, fmt->altsetting, err);
519 return -EIO;
520 }
521 }
522 subs->interface = -1;
523 subs->altset_idx = 0;
524 }
525
526 /* set interface */
527 if (iface->cur_altsetting != alts) {
528 err = snd_usb_select_mode_quirk(subs, fmt);
529 if (err < 0)
530 return -EIO;
531
532 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
533 if (err < 0) {
534 dev_err(&dev->dev,
535 "%d:%d: usb_set_interface failed (%d)\n",
536 fmt->iface, fmt->altsetting, err);
537 return -EIO;
538 }
539 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
540 fmt->iface, fmt->altsetting);
541 snd_usb_set_interface_quirk(dev);
542 }
543
544 subs->interface = fmt->iface;
545 subs->altset_idx = fmt->altset_idx;
546 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
547 alts, fmt->endpoint, subs->direction,
548 SND_USB_ENDPOINT_TYPE_DATA);
549
550 if (!subs->data_endpoint)
551 return -EINVAL;
552
553 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
554 if (err < 0)
555 return err;
556
557 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
558 if (err < 0)
559 return err;
560
561 subs->cur_audiofmt = fmt;
562
563 snd_usb_set_format_quirk(subs, fmt);
564
565 return 0;
566 }
567
568 /*
569 * Return the score of matching two audioformats.
570 * Veto the audioformat if:
571 * - It has no channels for some reason.
572 * - Requested PCM format is not supported.
573 * - Requested sample rate is not supported.
574 */
575 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
576 struct audioformat *fp,
577 struct audioformat *match, int rate,
578 snd_pcm_format_t pcm_format)
579 {
580 int i;
581 int score = 0;
582
583 if (fp->channels < 1) {
584 dev_dbg(&subs->dev->dev,
585 "%s: (fmt @%p) no channels\n", __func__, fp);
586 return 0;
587 }
588
589 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
590 dev_dbg(&subs->dev->dev,
591 "%s: (fmt @%p) no match for format %d\n", __func__,
592 fp, pcm_format);
593 return 0;
594 }
595
596 for (i = 0; i < fp->nr_rates; i++) {
597 if (fp->rate_table[i] == rate) {
598 score++;
599 break;
600 }
601 }
602 if (!score) {
603 dev_dbg(&subs->dev->dev,
604 "%s: (fmt @%p) no match for rate %d\n", __func__,
605 fp, rate);
606 return 0;
607 }
608
609 if (fp->channels == match->channels)
610 score++;
611
612 dev_dbg(&subs->dev->dev,
613 "%s: (fmt @%p) score %d\n", __func__, fp, score);
614
615 return score;
616 }
617
618 /*
619 * Configure the sync ep using the rate and pcm format of the data ep.
620 */
621 static int configure_sync_endpoint(struct snd_usb_substream *subs)
622 {
623 int ret;
624 struct audioformat *fp;
625 struct audioformat *sync_fp = NULL;
626 int cur_score = 0;
627 int sync_period_bytes = subs->period_bytes;
628 struct snd_usb_substream *sync_subs =
629 &subs->stream->substream[subs->direction ^ 1];
630
631 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
632 !subs->stream)
633 return snd_usb_endpoint_set_params(subs->sync_endpoint,
634 subs->pcm_format,
635 subs->channels,
636 subs->period_bytes,
637 0, 0,
638 subs->cur_rate,
639 subs->cur_audiofmt,
640 NULL);
641
642 /* Try to find the best matching audioformat. */
643 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
644 int score = match_endpoint_audioformats(subs,
645 fp, subs->cur_audiofmt,
646 subs->cur_rate, subs->pcm_format);
647
648 if (score > cur_score) {
649 sync_fp = fp;
650 cur_score = score;
651 }
652 }
653
654 if (unlikely(sync_fp == NULL)) {
655 dev_err(&subs->dev->dev,
656 "%s: no valid audioformat for sync ep %x found\n",
657 __func__, sync_subs->ep_num);
658 return -EINVAL;
659 }
660
661 /*
662 * Recalculate the period bytes if channel number differ between
663 * data and sync ep audioformat.
664 */
665 if (sync_fp->channels != subs->channels) {
666 sync_period_bytes = (subs->period_bytes / subs->channels) *
667 sync_fp->channels;
668 dev_dbg(&subs->dev->dev,
669 "%s: adjusted sync ep period bytes (%d -> %d)\n",
670 __func__, subs->period_bytes, sync_period_bytes);
671 }
672
673 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
674 subs->pcm_format,
675 sync_fp->channels,
676 sync_period_bytes,
677 0, 0,
678 subs->cur_rate,
679 sync_fp,
680 NULL);
681
682 return ret;
683 }
684
685 /*
686 * configure endpoint params
687 *
688 * called during initial setup and upon resume
689 */
690 static int configure_endpoint(struct snd_usb_substream *subs)
691 {
692 int ret;
693
694 /* format changed */
695 stop_endpoints(subs, true);
696 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
697 subs->pcm_format,
698 subs->channels,
699 subs->period_bytes,
700 subs->period_frames,
701 subs->buffer_periods,
702 subs->cur_rate,
703 subs->cur_audiofmt,
704 subs->sync_endpoint);
705 if (ret < 0)
706 return ret;
707
708 if (subs->sync_endpoint)
709 ret = configure_sync_endpoint(subs);
710
711 return ret;
712 }
713
714 /*
715 * hw_params callback
716 *
717 * allocate a buffer and set the given audio format.
718 *
719 * so far we use a physically linear buffer although packetize transfer
720 * doesn't need a continuous area.
721 * if sg buffer is supported on the later version of alsa, we'll follow
722 * that.
723 */
724 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
725 struct snd_pcm_hw_params *hw_params)
726 {
727 struct snd_usb_substream *subs = substream->runtime->private_data;
728 struct audioformat *fmt;
729 int ret;
730
731 if (snd_usb_use_vmalloc)
732 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
733 params_buffer_bytes(hw_params));
734 else
735 ret = snd_pcm_lib_malloc_pages(substream,
736 params_buffer_bytes(hw_params));
737 if (ret < 0)
738 return ret;
739
740 subs->pcm_format = params_format(hw_params);
741 subs->period_bytes = params_period_bytes(hw_params);
742 subs->period_frames = params_period_size(hw_params);
743 subs->buffer_periods = params_periods(hw_params);
744 subs->channels = params_channels(hw_params);
745 subs->cur_rate = params_rate(hw_params);
746
747 fmt = find_format(subs);
748 if (!fmt) {
749 dev_dbg(&subs->dev->dev,
750 "cannot set format: format = %#x, rate = %d, channels = %d\n",
751 subs->pcm_format, subs->cur_rate, subs->channels);
752 return -EINVAL;
753 }
754
755 ret = snd_usb_lock_shutdown(subs->stream->chip);
756 if (ret < 0)
757 return ret;
758 ret = set_format(subs, fmt);
759 snd_usb_unlock_shutdown(subs->stream->chip);
760 if (ret < 0)
761 return ret;
762
763 subs->interface = fmt->iface;
764 subs->altset_idx = fmt->altset_idx;
765 subs->need_setup_ep = true;
766
767 return 0;
768 }
769
770 /*
771 * hw_free callback
772 *
773 * reset the audio format and release the buffer
774 */
775 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
776 {
777 struct snd_usb_substream *subs = substream->runtime->private_data;
778
779 subs->cur_audiofmt = NULL;
780 subs->cur_rate = 0;
781 subs->period_bytes = 0;
782 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
783 stop_endpoints(subs, true);
784 snd_usb_endpoint_deactivate(subs->sync_endpoint);
785 snd_usb_endpoint_deactivate(subs->data_endpoint);
786 snd_usb_unlock_shutdown(subs->stream->chip);
787 }
788
789 if (snd_usb_use_vmalloc)
790 return snd_pcm_lib_free_vmalloc_buffer(substream);
791 else
792 return snd_pcm_lib_free_pages(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
1185 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1186 if (subs->speed == USB_SPEED_FULL)
1187 /* full speed devices have fixed data packet interval */
1188 ptmin = 1000;
1189 if (ptmin == 1000)
1190 /* if period time doesn't go below 1 ms, no rules needed */
1191 param_period_time_if_needed = -1;
1192
1193 err = snd_pcm_hw_constraint_minmax(runtime,
1194 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1195 ptmin, UINT_MAX);
1196 if (err < 0)
1197 return err;
1198
1199 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1200 hw_rule_rate, subs,
1201 SNDRV_PCM_HW_PARAM_FORMAT,
1202 SNDRV_PCM_HW_PARAM_CHANNELS,
1203 param_period_time_if_needed,
1204 -1);
1205 if (err < 0)
1206 return err;
1207 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1208 hw_rule_channels, subs,
1209 SNDRV_PCM_HW_PARAM_FORMAT,
1210 SNDRV_PCM_HW_PARAM_RATE,
1211 param_period_time_if_needed,
1212 -1);
1213 if (err < 0)
1214 return err;
1215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1216 hw_rule_format, subs,
1217 SNDRV_PCM_HW_PARAM_RATE,
1218 SNDRV_PCM_HW_PARAM_CHANNELS,
1219 param_period_time_if_needed,
1220 -1);
1221 if (err < 0)
1222 return err;
1223 if (param_period_time_if_needed >= 0) {
1224 err = snd_pcm_hw_rule_add(runtime, 0,
1225 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1226 hw_rule_period_time, subs,
1227 SNDRV_PCM_HW_PARAM_FORMAT,
1228 SNDRV_PCM_HW_PARAM_CHANNELS,
1229 SNDRV_PCM_HW_PARAM_RATE,
1230 -1);
1231 if (err < 0)
1232 return err;
1233 }
1234 err = snd_usb_pcm_check_knot(runtime, subs);
1235 if (err < 0)
1236 return err;
1237
1238 return snd_usb_autoresume(subs->stream->chip);
1239 }
1240
1241 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1242 {
1243 int direction = substream->stream;
1244 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1245 struct snd_pcm_runtime *runtime = substream->runtime;
1246 struct snd_usb_substream *subs = &as->substream[direction];
1247
1248 subs->interface = -1;
1249 subs->altset_idx = 0;
1250 runtime->hw = snd_usb_hardware;
1251 runtime->private_data = subs;
1252 subs->pcm_substream = substream;
1253 /* runtime PM is also done there */
1254
1255 /* initialize DSD/DOP context */
1256 subs->dsd_dop.byte_idx = 0;
1257 subs->dsd_dop.channel = 0;
1258 subs->dsd_dop.marker = 1;
1259
1260 return setup_hw_info(runtime, subs);
1261 }
1262
1263 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1264 {
1265 int direction = substream->stream;
1266 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1267 struct snd_usb_substream *subs = &as->substream[direction];
1268
1269 stop_endpoints(subs, true);
1270
1271 if (!as->chip->keep_iface &&
1272 subs->interface >= 0 &&
1273 !snd_usb_lock_shutdown(subs->stream->chip)) {
1274 usb_set_interface(subs->dev, subs->interface, 0);
1275 subs->interface = -1;
1276 snd_usb_unlock_shutdown(subs->stream->chip);
1277 }
1278
1279 subs->pcm_substream = NULL;
1280 snd_usb_autosuspend(subs->stream->chip);
1281
1282 return 0;
1283 }
1284
1285 /* Since a URB can handle only a single linear buffer, we must use double
1286 * buffering when the data to be transferred overflows the buffer boundary.
1287 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1288 * for all URBs.
1289 */
1290 static void retire_capture_urb(struct snd_usb_substream *subs,
1291 struct urb *urb)
1292 {
1293 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1294 unsigned int stride, frames, bytes, oldptr;
1295 int i, period_elapsed = 0;
1296 unsigned long flags;
1297 unsigned char *cp;
1298 int current_frame_number;
1299
1300 /* read frame number here, update pointer in critical section */
1301 current_frame_number = usb_get_current_frame_number(subs->dev);
1302
1303 stride = runtime->frame_bits >> 3;
1304
1305 for (i = 0; i < urb->number_of_packets; i++) {
1306 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1307 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1308 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1309 i, urb->iso_frame_desc[i].status);
1310 // continue;
1311 }
1312 bytes = urb->iso_frame_desc[i].actual_length;
1313 frames = bytes / stride;
1314 if (!subs->txfr_quirk)
1315 bytes = frames * stride;
1316 if (bytes % (runtime->sample_bits >> 3) != 0) {
1317 int oldbytes = bytes;
1318 bytes = frames * stride;
1319 dev_warn_ratelimited(&subs->dev->dev,
1320 "Corrected urb data len. %d->%d\n",
1321 oldbytes, bytes);
1322 }
1323 /* update the current pointer */
1324 spin_lock_irqsave(&subs->lock, flags);
1325 oldptr = subs->hwptr_done;
1326 subs->hwptr_done += bytes;
1327 if (subs->hwptr_done >= runtime->buffer_size * stride)
1328 subs->hwptr_done -= runtime->buffer_size * stride;
1329 frames = (bytes + (oldptr % stride)) / stride;
1330 subs->transfer_done += frames;
1331 if (subs->transfer_done >= runtime->period_size) {
1332 subs->transfer_done -= runtime->period_size;
1333 period_elapsed = 1;
1334 }
1335 /* capture delay is by construction limited to one URB,
1336 * reset delays here
1337 */
1338 runtime->delay = subs->last_delay = 0;
1339
1340 /* realign last_frame_number */
1341 subs->last_frame_number = current_frame_number;
1342 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1343
1344 spin_unlock_irqrestore(&subs->lock, flags);
1345 /* copy a data chunk */
1346 if (oldptr + bytes > runtime->buffer_size * stride) {
1347 unsigned int bytes1 =
1348 runtime->buffer_size * stride - oldptr;
1349 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1350 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1351 } else {
1352 memcpy(runtime->dma_area + oldptr, cp, bytes);
1353 }
1354 }
1355
1356 if (period_elapsed)
1357 snd_pcm_period_elapsed(subs->pcm_substream);
1358 }
1359
1360 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1361 struct urb *urb, unsigned int bytes)
1362 {
1363 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1364 unsigned int stride = runtime->frame_bits >> 3;
1365 unsigned int dst_idx = 0;
1366 unsigned int src_idx = subs->hwptr_done;
1367 unsigned int wrap = runtime->buffer_size * stride;
1368 u8 *dst = urb->transfer_buffer;
1369 u8 *src = runtime->dma_area;
1370 u8 marker[] = { 0x05, 0xfa };
1371
1372 /*
1373 * The DSP DOP format defines a way to transport DSD samples over
1374 * normal PCM data endpoints. It requires stuffing of marker bytes
1375 * (0x05 and 0xfa, alternating per sample frame), and then expects
1376 * 2 additional bytes of actual payload. The whole frame is stored
1377 * LSB.
1378 *
1379 * Hence, for a stereo transport, the buffer layout looks like this,
1380 * where L refers to left channel samples and R to right.
1381 *
1382 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1383 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1384 * .....
1385 *
1386 */
1387
1388 while (bytes--) {
1389 if (++subs->dsd_dop.byte_idx == 3) {
1390 /* frame boundary? */
1391 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1392 src_idx += 2;
1393 subs->dsd_dop.byte_idx = 0;
1394
1395 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1396 /* alternate the marker */
1397 subs->dsd_dop.marker++;
1398 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1399 subs->dsd_dop.channel = 0;
1400 }
1401 } else {
1402 /* stuff the DSD payload */
1403 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1404
1405 if (subs->cur_audiofmt->dsd_bitrev)
1406 dst[dst_idx++] = bitrev8(src[idx]);
1407 else
1408 dst[dst_idx++] = src[idx];
1409
1410 subs->hwptr_done++;
1411 }
1412 }
1413 if (subs->hwptr_done >= runtime->buffer_size * stride)
1414 subs->hwptr_done -= runtime->buffer_size * stride;
1415 }
1416
1417 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1418 int offset, int stride, unsigned int bytes)
1419 {
1420 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1421
1422 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1423 /* err, the transferred area goes over buffer boundary. */
1424 unsigned int bytes1 =
1425 runtime->buffer_size * stride - subs->hwptr_done;
1426 memcpy(urb->transfer_buffer + offset,
1427 runtime->dma_area + subs->hwptr_done, bytes1);
1428 memcpy(urb->transfer_buffer + offset + bytes1,
1429 runtime->dma_area, bytes - bytes1);
1430 } else {
1431 memcpy(urb->transfer_buffer + offset,
1432 runtime->dma_area + subs->hwptr_done, bytes);
1433 }
1434 subs->hwptr_done += bytes;
1435 if (subs->hwptr_done >= runtime->buffer_size * stride)
1436 subs->hwptr_done -= runtime->buffer_size * stride;
1437 }
1438
1439 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1440 struct urb *urb, int stride,
1441 unsigned int bytes)
1442 {
1443 __le32 packet_length;
1444 int i;
1445
1446 /* Put __le32 length descriptor at start of each packet. */
1447 for (i = 0; i < urb->number_of_packets; i++) {
1448 unsigned int length = urb->iso_frame_desc[i].length;
1449 unsigned int offset = urb->iso_frame_desc[i].offset;
1450
1451 packet_length = cpu_to_le32(length);
1452 offset += i * sizeof(packet_length);
1453 urb->iso_frame_desc[i].offset = offset;
1454 urb->iso_frame_desc[i].length += sizeof(packet_length);
1455 memcpy(urb->transfer_buffer + offset,
1456 &packet_length, sizeof(packet_length));
1457 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1458 stride, length);
1459 }
1460 /* Adjust transfer size accordingly. */
1461 bytes += urb->number_of_packets * sizeof(packet_length);
1462 return bytes;
1463 }
1464
1465 static void prepare_playback_urb(struct snd_usb_substream *subs,
1466 struct urb *urb)
1467 {
1468 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1469 struct snd_usb_endpoint *ep = subs->data_endpoint;
1470 struct snd_urb_ctx *ctx = urb->context;
1471 unsigned int counts, frames, bytes;
1472 int i, stride, period_elapsed = 0;
1473 unsigned long flags;
1474
1475 stride = runtime->frame_bits >> 3;
1476
1477 frames = 0;
1478 urb->number_of_packets = 0;
1479 spin_lock_irqsave(&subs->lock, flags);
1480 subs->frame_limit += ep->max_urb_frames;
1481 for (i = 0; i < ctx->packets; i++) {
1482 if (ctx->packet_size[i])
1483 counts = ctx->packet_size[i];
1484 else
1485 counts = snd_usb_endpoint_next_packet_size(ep);
1486
1487 /* set up descriptor */
1488 urb->iso_frame_desc[i].offset = frames * ep->stride;
1489 urb->iso_frame_desc[i].length = counts * ep->stride;
1490 frames += counts;
1491 urb->number_of_packets++;
1492 subs->transfer_done += counts;
1493 if (subs->transfer_done >= runtime->period_size) {
1494 subs->transfer_done -= runtime->period_size;
1495 subs->frame_limit = 0;
1496 period_elapsed = 1;
1497 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1498 if (subs->transfer_done > 0) {
1499 /* FIXME: fill-max mode is not
1500 * supported yet */
1501 frames -= subs->transfer_done;
1502 counts -= subs->transfer_done;
1503 urb->iso_frame_desc[i].length =
1504 counts * ep->stride;
1505 subs->transfer_done = 0;
1506 }
1507 i++;
1508 if (i < ctx->packets) {
1509 /* add a transfer delimiter */
1510 urb->iso_frame_desc[i].offset =
1511 frames * ep->stride;
1512 urb->iso_frame_desc[i].length = 0;
1513 urb->number_of_packets++;
1514 }
1515 break;
1516 }
1517 }
1518 /* finish at the period boundary or after enough frames */
1519 if ((period_elapsed ||
1520 subs->transfer_done >= subs->frame_limit) &&
1521 !snd_usb_endpoint_implicit_feedback_sink(ep))
1522 break;
1523 }
1524 bytes = frames * ep->stride;
1525
1526 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1527 subs->cur_audiofmt->dsd_dop)) {
1528 fill_playback_urb_dsd_dop(subs, urb, bytes);
1529 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1530 subs->cur_audiofmt->dsd_bitrev)) {
1531 /* bit-reverse the bytes */
1532 u8 *buf = urb->transfer_buffer;
1533 for (i = 0; i < bytes; i++) {
1534 int idx = (subs->hwptr_done + i)
1535 % (runtime->buffer_size * stride);
1536 buf[i] = bitrev8(runtime->dma_area[idx]);
1537 }
1538
1539 subs->hwptr_done += bytes;
1540 if (subs->hwptr_done >= runtime->buffer_size * stride)
1541 subs->hwptr_done -= runtime->buffer_size * stride;
1542 } else {
1543 /* usual PCM */
1544 if (!subs->tx_length_quirk)
1545 copy_to_urb(subs, urb, 0, stride, bytes);
1546 else
1547 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1548 /* bytes is now amount of outgoing data */
1549 }
1550
1551 /* update delay with exact number of samples queued */
1552 runtime->delay = subs->last_delay;
1553 runtime->delay += frames;
1554 subs->last_delay = runtime->delay;
1555
1556 /* realign last_frame_number */
1557 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1558 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1559
1560 if (subs->trigger_tstamp_pending_update) {
1561 /* this is the first actual URB submitted,
1562 * update trigger timestamp to reflect actual start time
1563 */
1564 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1565 subs->trigger_tstamp_pending_update = false;
1566 }
1567
1568 spin_unlock_irqrestore(&subs->lock, flags);
1569 urb->transfer_buffer_length = bytes;
1570 if (period_elapsed)
1571 snd_pcm_period_elapsed(subs->pcm_substream);
1572 }
1573
1574 /*
1575 * process after playback data complete
1576 * - decrease the delay count again
1577 */
1578 static void retire_playback_urb(struct snd_usb_substream *subs,
1579 struct urb *urb)
1580 {
1581 unsigned long flags;
1582 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1583 struct snd_usb_endpoint *ep = subs->data_endpoint;
1584 int processed = urb->transfer_buffer_length / ep->stride;
1585 int est_delay;
1586
1587 /* ignore the delay accounting when procssed=0 is given, i.e.
1588 * silent payloads are procssed before handling the actual data
1589 */
1590 if (!processed)
1591 return;
1592
1593 spin_lock_irqsave(&subs->lock, flags);
1594 if (!subs->last_delay)
1595 goto out; /* short path */
1596
1597 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1598 /* update delay with exact number of samples played */
1599 if (processed > subs->last_delay)
1600 subs->last_delay = 0;
1601 else
1602 subs->last_delay -= processed;
1603 runtime->delay = subs->last_delay;
1604
1605 /*
1606 * Report when delay estimate is off by more than 2ms.
1607 * The error should be lower than 2ms since the estimate relies
1608 * on two reads of a counter updated every ms.
1609 */
1610 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1611 dev_dbg_ratelimited(&subs->dev->dev,
1612 "delay: estimated %d, actual %d\n",
1613 est_delay, subs->last_delay);
1614
1615 if (!subs->running) {
1616 /* update last_frame_number for delay counting here since
1617 * prepare_playback_urb won't be called during pause
1618 */
1619 subs->last_frame_number =
1620 usb_get_current_frame_number(subs->dev) & 0xff;
1621 }
1622
1623 out:
1624 spin_unlock_irqrestore(&subs->lock, flags);
1625 }
1626
1627 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1628 int cmd)
1629 {
1630 struct snd_usb_substream *subs = substream->runtime->private_data;
1631
1632 switch (cmd) {
1633 case SNDRV_PCM_TRIGGER_START:
1634 subs->trigger_tstamp_pending_update = true;
1635 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1636 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1637 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1638 subs->running = 1;
1639 return 0;
1640 case SNDRV_PCM_TRIGGER_STOP:
1641 stop_endpoints(subs, false);
1642 subs->running = 0;
1643 return 0;
1644 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1645 subs->data_endpoint->prepare_data_urb = NULL;
1646 /* keep retire_data_urb for delay calculation */
1647 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1648 subs->running = 0;
1649 return 0;
1650 }
1651
1652 return -EINVAL;
1653 }
1654
1655 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1656 int cmd)
1657 {
1658 int err;
1659 struct snd_usb_substream *subs = substream->runtime->private_data;
1660
1661 switch (cmd) {
1662 case SNDRV_PCM_TRIGGER_START:
1663 err = start_endpoints(subs);
1664 if (err < 0)
1665 return err;
1666
1667 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1668 subs->running = 1;
1669 return 0;
1670 case SNDRV_PCM_TRIGGER_STOP:
1671 stop_endpoints(subs, false);
1672 subs->running = 0;
1673 return 0;
1674 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1675 subs->data_endpoint->retire_data_urb = NULL;
1676 subs->running = 0;
1677 return 0;
1678 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1679 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1680 subs->running = 1;
1681 return 0;
1682 }
1683
1684 return -EINVAL;
1685 }
1686
1687 static const struct snd_pcm_ops snd_usb_playback_ops = {
1688 .open = snd_usb_pcm_open,
1689 .close = snd_usb_pcm_close,
1690 .ioctl = snd_pcm_lib_ioctl,
1691 .hw_params = snd_usb_hw_params,
1692 .hw_free = snd_usb_hw_free,
1693 .prepare = snd_usb_pcm_prepare,
1694 .trigger = snd_usb_substream_playback_trigger,
1695 .pointer = snd_usb_pcm_pointer,
1696 .page = snd_pcm_lib_get_vmalloc_page,
1697 .mmap = snd_pcm_lib_mmap_vmalloc,
1698 };
1699
1700 static const struct snd_pcm_ops snd_usb_capture_ops = {
1701 .open = snd_usb_pcm_open,
1702 .close = snd_usb_pcm_close,
1703 .ioctl = snd_pcm_lib_ioctl,
1704 .hw_params = snd_usb_hw_params,
1705 .hw_free = snd_usb_hw_free,
1706 .prepare = snd_usb_pcm_prepare,
1707 .trigger = snd_usb_substream_capture_trigger,
1708 .pointer = snd_usb_pcm_pointer,
1709 .page = snd_pcm_lib_get_vmalloc_page,
1710 .mmap = snd_pcm_lib_mmap_vmalloc,
1711 };
1712
1713 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1714 .open = snd_usb_pcm_open,
1715 .close = snd_usb_pcm_close,
1716 .ioctl = snd_pcm_lib_ioctl,
1717 .hw_params = snd_usb_hw_params,
1718 .hw_free = snd_usb_hw_free,
1719 .prepare = snd_usb_pcm_prepare,
1720 .trigger = snd_usb_substream_playback_trigger,
1721 .pointer = snd_usb_pcm_pointer,
1722 .page = snd_pcm_sgbuf_ops_page,
1723 };
1724
1725 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1726 .open = snd_usb_pcm_open,
1727 .close = snd_usb_pcm_close,
1728 .ioctl = snd_pcm_lib_ioctl,
1729 .hw_params = snd_usb_hw_params,
1730 .hw_free = snd_usb_hw_free,
1731 .prepare = snd_usb_pcm_prepare,
1732 .trigger = snd_usb_substream_capture_trigger,
1733 .pointer = snd_usb_pcm_pointer,
1734 .page = snd_pcm_sgbuf_ops_page,
1735 };
1736
1737 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1738 {
1739 const struct snd_pcm_ops *ops;
1740
1741 if (snd_usb_use_vmalloc)
1742 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1743 &snd_usb_playback_ops : &snd_usb_capture_ops;
1744 else
1745 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1746 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1747 snd_pcm_set_ops(pcm, stream, ops);
1748 }
1749
1750 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1751 {
1752 struct snd_pcm *pcm = subs->stream->pcm;
1753 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1754 struct device *dev = subs->dev->bus->controller;
1755
1756 if (!snd_usb_use_vmalloc)
1757 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1758 dev, 64*1024, 512*1024);
1759 }
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