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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / sound / usb / pcm.c
bloba9079654107c10c70c454f4745894d47447444ee
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(0x1397, 0x0002):
352 ep = 0x81;
353 iface = usb_ifnum_to_if(dev, 1);
354
355 if (!iface || iface->num_altsetting == 0)
356 return -EINVAL;
357
358 alts = &iface->altsetting[1];
359 goto add_sync_ep;
360 }
361 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
362 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
363 altsd->bInterfaceProtocol == 2 &&
364 altsd->bNumEndpoints == 1 &&
365 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
366 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
367 altsd->bAlternateSetting,
368 &alts, &ep) >= 0) {
369 goto add_sync_ep;
370 }
371
372 /* No quirk */
373 return 0;
374
375 add_sync_ep:
376 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
377 alts, ep, !subs->direction,
378 SND_USB_ENDPOINT_TYPE_DATA);
379 if (!subs->sync_endpoint)
380 return -EINVAL;
381
382 subs->data_endpoint->sync_master = subs->sync_endpoint;
383
384 return 0;
385 }
386
387 static int set_sync_endpoint(struct snd_usb_substream *subs,
388 struct audioformat *fmt,
389 struct usb_device *dev,
390 struct usb_host_interface *alts,
391 struct usb_interface_descriptor *altsd)
392 {
393 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
394 unsigned int ep, attr;
395 bool implicit_fb;
396 int err;
397
398 /* we need a sync pipe in async OUT or adaptive IN mode */
399 /* check the number of EP, since some devices have broken
400 * descriptors which fool us. if it has only one EP,
401 * assume it as adaptive-out or sync-in.
402 */
403 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
404
405 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
406 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
407
408 /*
409 * In these modes the notion of sync_endpoint is irrelevant.
410 * Reset pointers to avoid using stale data from previously
411 * used settings, e.g. when configuration and endpoints were
412 * changed
413 */
414
415 subs->sync_endpoint = NULL;
416 subs->data_endpoint->sync_master = NULL;
417 }
418
419 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
420 if (err < 0)
421 return err;
422
423 if (altsd->bNumEndpoints < 2)
424 return 0;
425
426 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
427 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
428 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
429 return 0;
430
431 /*
432 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
433 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
434 * error fall back to SYNC mode and don't create sync endpoint
435 */
436
437 /* check sync-pipe endpoint */
438 /* ... and check descriptor size before accessing bSynchAddress
439 because there is a version of the SB Audigy 2 NX firmware lacking
440 the audio fields in the endpoint descriptors */
441 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
442 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
443 get_endpoint(alts, 1)->bSynchAddress != 0)) {
444 dev_err(&dev->dev,
445 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
446 fmt->iface, fmt->altsetting,
447 get_endpoint(alts, 1)->bmAttributes,
448 get_endpoint(alts, 1)->bLength,
449 get_endpoint(alts, 1)->bSynchAddress);
450 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
451 return 0;
452 return -EINVAL;
453 }
454 ep = get_endpoint(alts, 1)->bEndpointAddress;
455 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
456 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
457 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
458 dev_err(&dev->dev,
459 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
460 fmt->iface, fmt->altsetting,
461 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
462 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
463 return 0;
464 return -EINVAL;
465 }
466
467 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
468 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
469
470 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
471 alts, ep, !subs->direction,
472 implicit_fb ?
473 SND_USB_ENDPOINT_TYPE_DATA :
474 SND_USB_ENDPOINT_TYPE_SYNC);
475 if (!subs->sync_endpoint) {
476 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
477 return 0;
478 return -EINVAL;
479 }
480
481 subs->data_endpoint->sync_master = subs->sync_endpoint;
482
483 return 0;
484 }
485
486 /*
487 * find a matching format and set up the interface
488 */
489 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
490 {
491 struct usb_device *dev = subs->dev;
492 struct usb_host_interface *alts;
493 struct usb_interface_descriptor *altsd;
494 struct usb_interface *iface;
495 int err;
496
497 iface = usb_ifnum_to_if(dev, fmt->iface);
498 if (WARN_ON(!iface))
499 return -EINVAL;
500 alts = &iface->altsetting[fmt->altset_idx];
501 altsd = get_iface_desc(alts);
502 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
503 return -EINVAL;
504
505 if (fmt == subs->cur_audiofmt)
506 return 0;
507
508 /* close the old interface */
509 if (subs->interface >= 0 && subs->interface != fmt->iface) {
510 err = usb_set_interface(subs->dev, subs->interface, 0);
511 if (err < 0) {
512 dev_err(&dev->dev,
513 "%d:%d: return to setting 0 failed (%d)\n",
514 fmt->iface, fmt->altsetting, err);
515 return -EIO;
516 }
517 subs->interface = -1;
518 subs->altset_idx = 0;
519 }
520
521 /* set interface */
522 if (subs->interface != fmt->iface ||
523 subs->altset_idx != fmt->altset_idx) {
524
525 err = snd_usb_select_mode_quirk(subs, fmt);
526 if (err < 0)
527 return -EIO;
528
529 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
530 if (err < 0) {
531 dev_err(&dev->dev,
532 "%d:%d: usb_set_interface failed (%d)\n",
533 fmt->iface, fmt->altsetting, err);
534 return -EIO;
535 }
536 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
537 fmt->iface, fmt->altsetting);
538 subs->interface = fmt->iface;
539 subs->altset_idx = fmt->altset_idx;
540
541 snd_usb_set_interface_quirk(dev);
542 }
543
544 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
545 alts, fmt->endpoint, subs->direction,
546 SND_USB_ENDPOINT_TYPE_DATA);
547
548 if (!subs->data_endpoint)
549 return -EINVAL;
550
551 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
552 if (err < 0)
553 return err;
554
555 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
556 if (err < 0)
557 return err;
558
559 subs->cur_audiofmt = fmt;
560
561 snd_usb_set_format_quirk(subs, fmt);
562
563 return 0;
564 }
565
566 /*
567 * Return the score of matching two audioformats.
568 * Veto the audioformat if:
569 * - It has no channels for some reason.
570 * - Requested PCM format is not supported.
571 * - Requested sample rate is not supported.
572 */
573 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
574 struct audioformat *fp,
575 struct audioformat *match, int rate,
576 snd_pcm_format_t pcm_format)
577 {
578 int i;
579 int score = 0;
580
581 if (fp->channels < 1) {
582 dev_dbg(&subs->dev->dev,
583 "%s: (fmt @%p) no channels\n", __func__, fp);
584 return 0;
585 }
586
587 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
588 dev_dbg(&subs->dev->dev,
589 "%s: (fmt @%p) no match for format %d\n", __func__,
590 fp, pcm_format);
591 return 0;
592 }
593
594 for (i = 0; i < fp->nr_rates; i++) {
595 if (fp->rate_table[i] == rate) {
596 score++;
597 break;
598 }
599 }
600 if (!score) {
601 dev_dbg(&subs->dev->dev,
602 "%s: (fmt @%p) no match for rate %d\n", __func__,
603 fp, rate);
604 return 0;
605 }
606
607 if (fp->channels == match->channels)
608 score++;
609
610 dev_dbg(&subs->dev->dev,
611 "%s: (fmt @%p) score %d\n", __func__, fp, score);
612
613 return score;
614 }
615
616 /*
617 * Configure the sync ep using the rate and pcm format of the data ep.
618 */
619 static int configure_sync_endpoint(struct snd_usb_substream *subs)
620 {
621 int ret;
622 struct audioformat *fp;
623 struct audioformat *sync_fp = NULL;
624 int cur_score = 0;
625 int sync_period_bytes = subs->period_bytes;
626 struct snd_usb_substream *sync_subs =
627 &subs->stream->substream[subs->direction ^ 1];
628
629 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
630 !subs->stream)
631 return snd_usb_endpoint_set_params(subs->sync_endpoint,
632 subs->pcm_format,
633 subs->channels,
634 subs->period_bytes,
635 0, 0,
636 subs->cur_rate,
637 subs->cur_audiofmt,
638 NULL);
639
640 /* Try to find the best matching audioformat. */
641 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
642 int score = match_endpoint_audioformats(subs,
643 fp, subs->cur_audiofmt,
644 subs->cur_rate, subs->pcm_format);
645
646 if (score > cur_score) {
647 sync_fp = fp;
648 cur_score = score;
649 }
650 }
651
652 if (unlikely(sync_fp == NULL)) {
653 dev_err(&subs->dev->dev,
654 "%s: no valid audioformat for sync ep %x found\n",
655 __func__, sync_subs->ep_num);
656 return -EINVAL;
657 }
658
659 /*
660 * Recalculate the period bytes if channel number differ between
661 * data and sync ep audioformat.
662 */
663 if (sync_fp->channels != subs->channels) {
664 sync_period_bytes = (subs->period_bytes / subs->channels) *
665 sync_fp->channels;
666 dev_dbg(&subs->dev->dev,
667 "%s: adjusted sync ep period bytes (%d -> %d)\n",
668 __func__, subs->period_bytes, sync_period_bytes);
669 }
670
671 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
672 subs->pcm_format,
673 sync_fp->channels,
674 sync_period_bytes,
675 0, 0,
676 subs->cur_rate,
677 sync_fp,
678 NULL);
679
680 return ret;
681 }
682
683 /*
684 * configure endpoint params
685 *
686 * called during initial setup and upon resume
687 */
688 static int configure_endpoint(struct snd_usb_substream *subs)
689 {
690 int ret;
691
692 /* format changed */
693 stop_endpoints(subs, true);
694 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
695 subs->pcm_format,
696 subs->channels,
697 subs->period_bytes,
698 subs->period_frames,
699 subs->buffer_periods,
700 subs->cur_rate,
701 subs->cur_audiofmt,
702 subs->sync_endpoint);
703 if (ret < 0)
704 return ret;
705
706 if (subs->sync_endpoint)
707 ret = configure_sync_endpoint(subs);
708
709 return ret;
710 }
711
712 /*
713 * hw_params callback
714 *
715 * allocate a buffer and set the given audio format.
716 *
717 * so far we use a physically linear buffer although packetize transfer
718 * doesn't need a continuous area.
719 * if sg buffer is supported on the later version of alsa, we'll follow
720 * that.
721 */
722 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
723 struct snd_pcm_hw_params *hw_params)
724 {
725 struct snd_usb_substream *subs = substream->runtime->private_data;
726 struct audioformat *fmt;
727 int ret;
728
729 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
730 params_buffer_bytes(hw_params));
731 if (ret < 0)
732 return ret;
733
734 subs->pcm_format = params_format(hw_params);
735 subs->period_bytes = params_period_bytes(hw_params);
736 subs->period_frames = params_period_size(hw_params);
737 subs->buffer_periods = params_periods(hw_params);
738 subs->channels = params_channels(hw_params);
739 subs->cur_rate = params_rate(hw_params);
740
741 fmt = find_format(subs);
742 if (!fmt) {
743 dev_dbg(&subs->dev->dev,
744 "cannot set format: format = %#x, rate = %d, channels = %d\n",
745 subs->pcm_format, subs->cur_rate, subs->channels);
746 return -EINVAL;
747 }
748
749 ret = snd_usb_lock_shutdown(subs->stream->chip);
750 if (ret < 0)
751 return ret;
752 ret = set_format(subs, fmt);
753 snd_usb_unlock_shutdown(subs->stream->chip);
754 if (ret < 0)
755 return ret;
756
757 subs->interface = fmt->iface;
758 subs->altset_idx = fmt->altset_idx;
759 subs->need_setup_ep = true;
760
761 return 0;
762 }
763
764 /*
765 * hw_free callback
766 *
767 * reset the audio format and release the buffer
768 */
769 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
770 {
771 struct snd_usb_substream *subs = substream->runtime->private_data;
772
773 subs->cur_audiofmt = NULL;
774 subs->cur_rate = 0;
775 subs->period_bytes = 0;
776 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
777 stop_endpoints(subs, true);
778 snd_usb_endpoint_deactivate(subs->sync_endpoint);
779 snd_usb_endpoint_deactivate(subs->data_endpoint);
780 snd_usb_unlock_shutdown(subs->stream->chip);
781 }
782 return snd_pcm_lib_free_vmalloc_buffer(substream);
783 }
784
785 /*
786 * prepare callback
787 *
788 * only a few subtle things...
789 */
790 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
791 {
792 struct snd_pcm_runtime *runtime = substream->runtime;
793 struct snd_usb_substream *subs = runtime->private_data;
794 struct usb_host_interface *alts;
795 struct usb_interface *iface;
796 int ret;
797
798 if (! subs->cur_audiofmt) {
799 dev_err(&subs->dev->dev, "no format is specified!\n");
800 return -ENXIO;
801 }
802
803 ret = snd_usb_lock_shutdown(subs->stream->chip);
804 if (ret < 0)
805 return ret;
806 if (snd_BUG_ON(!subs->data_endpoint)) {
807 ret = -EIO;
808 goto unlock;
809 }
810
811 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
812 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
813
814 ret = set_format(subs, subs->cur_audiofmt);
815 if (ret < 0)
816 goto unlock;
817
818 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
819 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
820 ret = snd_usb_init_sample_rate(subs->stream->chip,
821 subs->cur_audiofmt->iface,
822 alts,
823 subs->cur_audiofmt,
824 subs->cur_rate);
825 if (ret < 0)
826 goto unlock;
827
828 if (subs->need_setup_ep) {
829 ret = configure_endpoint(subs);
830 if (ret < 0)
831 goto unlock;
832 subs->need_setup_ep = false;
833 }
834
835 /* some unit conversions in runtime */
836 subs->data_endpoint->maxframesize =
837 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
838 subs->data_endpoint->curframesize =
839 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
840
841 /* reset the pointer */
842 subs->hwptr_done = 0;
843 subs->transfer_done = 0;
844 subs->last_delay = 0;
845 subs->last_frame_number = 0;
846 runtime->delay = 0;
847
848 /* for playback, submit the URBs now; otherwise, the first hwptr_done
849 * updates for all URBs would happen at the same time when starting */
850 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
851 ret = start_endpoints(subs);
852
853 unlock:
854 snd_usb_unlock_shutdown(subs->stream->chip);
855 return ret;
856 }
857
858 static struct snd_pcm_hardware snd_usb_hardware =
859 {
860 .info = SNDRV_PCM_INFO_MMAP |
861 SNDRV_PCM_INFO_MMAP_VALID |
862 SNDRV_PCM_INFO_BATCH |
863 SNDRV_PCM_INFO_INTERLEAVED |
864 SNDRV_PCM_INFO_BLOCK_TRANSFER |
865 SNDRV_PCM_INFO_PAUSE,
866 .buffer_bytes_max = 1024 * 1024,
867 .period_bytes_min = 64,
868 .period_bytes_max = 512 * 1024,
869 .periods_min = 2,
870 .periods_max = 1024,
871 };
872
873 static int hw_check_valid_format(struct snd_usb_substream *subs,
874 struct snd_pcm_hw_params *params,
875 struct audioformat *fp)
876 {
877 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
878 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
879 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
880 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
881 struct snd_mask check_fmts;
882 unsigned int ptime;
883
884 /* check the format */
885 snd_mask_none(&check_fmts);
886 check_fmts.bits[0] = (u32)fp->formats;
887 check_fmts.bits[1] = (u32)(fp->formats >> 32);
888 snd_mask_intersect(&check_fmts, fmts);
889 if (snd_mask_empty(&check_fmts)) {
890 hwc_debug(" > check: no supported format %d\n", fp->format);
891 return 0;
892 }
893 /* check the channels */
894 if (fp->channels < ct->min || fp->channels > ct->max) {
895 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
896 return 0;
897 }
898 /* check the rate is within the range */
899 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
900 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
901 return 0;
902 }
903 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
904 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
905 return 0;
906 }
907 /* check whether the period time is >= the data packet interval */
908 if (subs->speed != USB_SPEED_FULL) {
909 ptime = 125 * (1 << fp->datainterval);
910 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
911 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
912 return 0;
913 }
914 }
915 return 1;
916 }
917
918 static int hw_rule_rate(struct snd_pcm_hw_params *params,
919 struct snd_pcm_hw_rule *rule)
920 {
921 struct snd_usb_substream *subs = rule->private;
922 struct audioformat *fp;
923 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
924 unsigned int rmin, rmax;
925 int changed;
926
927 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
928 changed = 0;
929 rmin = rmax = 0;
930 list_for_each_entry(fp, &subs->fmt_list, list) {
931 if (!hw_check_valid_format(subs, params, fp))
932 continue;
933 if (changed++) {
934 if (rmin > fp->rate_min)
935 rmin = fp->rate_min;
936 if (rmax < fp->rate_max)
937 rmax = fp->rate_max;
938 } else {
939 rmin = fp->rate_min;
940 rmax = fp->rate_max;
941 }
942 }
943
944 if (!changed) {
945 hwc_debug(" --> get empty\n");
946 it->empty = 1;
947 return -EINVAL;
948 }
949
950 changed = 0;
951 if (it->min < rmin) {
952 it->min = rmin;
953 it->openmin = 0;
954 changed = 1;
955 }
956 if (it->max > rmax) {
957 it->max = rmax;
958 it->openmax = 0;
959 changed = 1;
960 }
961 if (snd_interval_checkempty(it)) {
962 it->empty = 1;
963 return -EINVAL;
964 }
965 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
966 return changed;
967 }
968
969
970 static int hw_rule_channels(struct snd_pcm_hw_params *params,
971 struct snd_pcm_hw_rule *rule)
972 {
973 struct snd_usb_substream *subs = rule->private;
974 struct audioformat *fp;
975 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
976 unsigned int rmin, rmax;
977 int changed;
978
979 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
980 changed = 0;
981 rmin = rmax = 0;
982 list_for_each_entry(fp, &subs->fmt_list, list) {
983 if (!hw_check_valid_format(subs, params, fp))
984 continue;
985 if (changed++) {
986 if (rmin > fp->channels)
987 rmin = fp->channels;
988 if (rmax < fp->channels)
989 rmax = fp->channels;
990 } else {
991 rmin = fp->channels;
992 rmax = fp->channels;
993 }
994 }
995
996 if (!changed) {
997 hwc_debug(" --> get empty\n");
998 it->empty = 1;
999 return -EINVAL;
1000 }
1001
1002 changed = 0;
1003 if (it->min < rmin) {
1004 it->min = rmin;
1005 it->openmin = 0;
1006 changed = 1;
1007 }
1008 if (it->max > rmax) {
1009 it->max = rmax;
1010 it->openmax = 0;
1011 changed = 1;
1012 }
1013 if (snd_interval_checkempty(it)) {
1014 it->empty = 1;
1015 return -EINVAL;
1016 }
1017 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1018 return changed;
1019 }
1020
1021 static int hw_rule_format(struct snd_pcm_hw_params *params,
1022 struct snd_pcm_hw_rule *rule)
1023 {
1024 struct snd_usb_substream *subs = rule->private;
1025 struct audioformat *fp;
1026 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1027 u64 fbits;
1028 u32 oldbits[2];
1029 int changed;
1030
1031 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1032 fbits = 0;
1033 list_for_each_entry(fp, &subs->fmt_list, list) {
1034 if (!hw_check_valid_format(subs, params, fp))
1035 continue;
1036 fbits |= fp->formats;
1037 }
1038
1039 oldbits[0] = fmt->bits[0];
1040 oldbits[1] = fmt->bits[1];
1041 fmt->bits[0] &= (u32)fbits;
1042 fmt->bits[1] &= (u32)(fbits >> 32);
1043 if (!fmt->bits[0] && !fmt->bits[1]) {
1044 hwc_debug(" --> get empty\n");
1045 return -EINVAL;
1046 }
1047 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1048 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1049 return changed;
1050 }
1051
1052 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1053 struct snd_pcm_hw_rule *rule)
1054 {
1055 struct snd_usb_substream *subs = rule->private;
1056 struct audioformat *fp;
1057 struct snd_interval *it;
1058 unsigned char min_datainterval;
1059 unsigned int pmin;
1060 int changed;
1061
1062 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1063 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1064 min_datainterval = 0xff;
1065 list_for_each_entry(fp, &subs->fmt_list, list) {
1066 if (!hw_check_valid_format(subs, params, fp))
1067 continue;
1068 min_datainterval = min(min_datainterval, fp->datainterval);
1069 }
1070 if (min_datainterval == 0xff) {
1071 hwc_debug(" --> get empty\n");
1072 it->empty = 1;
1073 return -EINVAL;
1074 }
1075 pmin = 125 * (1 << min_datainterval);
1076 changed = 0;
1077 if (it->min < pmin) {
1078 it->min = pmin;
1079 it->openmin = 0;
1080 changed = 1;
1081 }
1082 if (snd_interval_checkempty(it)) {
1083 it->empty = 1;
1084 return -EINVAL;
1085 }
1086 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1087 return changed;
1088 }
1089
1090 /*
1091 * If the device supports unusual bit rates, does the request meet these?
1092 */
1093 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1094 struct snd_usb_substream *subs)
1095 {
1096 struct audioformat *fp;
1097 int *rate_list;
1098 int count = 0, needs_knot = 0;
1099 int err;
1100
1101 kfree(subs->rate_list.list);
1102 subs->rate_list.list = NULL;
1103
1104 list_for_each_entry(fp, &subs->fmt_list, list) {
1105 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1106 return 0;
1107 count += fp->nr_rates;
1108 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1109 needs_knot = 1;
1110 }
1111 if (!needs_knot)
1112 return 0;
1113
1114 subs->rate_list.list = rate_list =
1115 kmalloc(sizeof(int) * count, GFP_KERNEL);
1116 if (!subs->rate_list.list)
1117 return -ENOMEM;
1118 subs->rate_list.count = count;
1119 subs->rate_list.mask = 0;
1120 count = 0;
1121 list_for_each_entry(fp, &subs->fmt_list, list) {
1122 int i;
1123 for (i = 0; i < fp->nr_rates; i++)
1124 rate_list[count++] = fp->rate_table[i];
1125 }
1126 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1127 &subs->rate_list);
1128 if (err < 0)
1129 return err;
1130
1131 return 0;
1132 }
1133
1134
1135 /*
1136 * set up the runtime hardware information.
1137 */
1138
1139 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1140 {
1141 struct audioformat *fp;
1142 unsigned int pt, ptmin;
1143 int param_period_time_if_needed;
1144 int err;
1145
1146 runtime->hw.formats = subs->formats;
1147
1148 runtime->hw.rate_min = 0x7fffffff;
1149 runtime->hw.rate_max = 0;
1150 runtime->hw.channels_min = 256;
1151 runtime->hw.channels_max = 0;
1152 runtime->hw.rates = 0;
1153 ptmin = UINT_MAX;
1154 /* check min/max rates and channels */
1155 list_for_each_entry(fp, &subs->fmt_list, list) {
1156 runtime->hw.rates |= fp->rates;
1157 if (runtime->hw.rate_min > fp->rate_min)
1158 runtime->hw.rate_min = fp->rate_min;
1159 if (runtime->hw.rate_max < fp->rate_max)
1160 runtime->hw.rate_max = fp->rate_max;
1161 if (runtime->hw.channels_min > fp->channels)
1162 runtime->hw.channels_min = fp->channels;
1163 if (runtime->hw.channels_max < fp->channels)
1164 runtime->hw.channels_max = fp->channels;
1165 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1166 /* FIXME: there might be more than one audio formats... */
1167 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1168 fp->frame_size;
1169 }
1170 pt = 125 * (1 << fp->datainterval);
1171 ptmin = min(ptmin, pt);
1172 }
1173 err = snd_usb_autoresume(subs->stream->chip);
1174 if (err < 0)
1175 return err;
1176
1177 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1178 if (subs->speed == USB_SPEED_FULL)
1179 /* full speed devices have fixed data packet interval */
1180 ptmin = 1000;
1181 if (ptmin == 1000)
1182 /* if period time doesn't go below 1 ms, no rules needed */
1183 param_period_time_if_needed = -1;
1184 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1185 ptmin, UINT_MAX);
1186
1187 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1188 hw_rule_rate, subs,
1189 SNDRV_PCM_HW_PARAM_FORMAT,
1190 SNDRV_PCM_HW_PARAM_CHANNELS,
1191 param_period_time_if_needed,
1192 -1)) < 0)
1193 goto rep_err;
1194 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1195 hw_rule_channels, subs,
1196 SNDRV_PCM_HW_PARAM_FORMAT,
1197 SNDRV_PCM_HW_PARAM_RATE,
1198 param_period_time_if_needed,
1199 -1)) < 0)
1200 goto rep_err;
1201 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1202 hw_rule_format, subs,
1203 SNDRV_PCM_HW_PARAM_RATE,
1204 SNDRV_PCM_HW_PARAM_CHANNELS,
1205 param_period_time_if_needed,
1206 -1)) < 0)
1207 goto rep_err;
1208 if (param_period_time_if_needed >= 0) {
1209 err = snd_pcm_hw_rule_add(runtime, 0,
1210 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1211 hw_rule_period_time, subs,
1212 SNDRV_PCM_HW_PARAM_FORMAT,
1213 SNDRV_PCM_HW_PARAM_CHANNELS,
1214 SNDRV_PCM_HW_PARAM_RATE,
1215 -1);
1216 if (err < 0)
1217 goto rep_err;
1218 }
1219 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1220 goto rep_err;
1221 return 0;
1222
1223 rep_err:
1224 snd_usb_autosuspend(subs->stream->chip);
1225 return err;
1226 }
1227
1228 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1229 {
1230 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1231 struct snd_pcm_runtime *runtime = substream->runtime;
1232 struct snd_usb_substream *subs = &as->substream[direction];
1233
1234 subs->interface = -1;
1235 subs->altset_idx = 0;
1236 runtime->hw = snd_usb_hardware;
1237 runtime->private_data = subs;
1238 subs->pcm_substream = substream;
1239 /* runtime PM is also done there */
1240
1241 /* initialize DSD/DOP context */
1242 subs->dsd_dop.byte_idx = 0;
1243 subs->dsd_dop.channel = 0;
1244 subs->dsd_dop.marker = 1;
1245
1246 return setup_hw_info(runtime, subs);
1247 }
1248
1249 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1250 {
1251 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1252 struct snd_usb_substream *subs = &as->substream[direction];
1253
1254 stop_endpoints(subs, true);
1255
1256 if (subs->interface >= 0 &&
1257 !snd_usb_lock_shutdown(subs->stream->chip)) {
1258 usb_set_interface(subs->dev, subs->interface, 0);
1259 subs->interface = -1;
1260 snd_usb_unlock_shutdown(subs->stream->chip);
1261 }
1262
1263 subs->pcm_substream = NULL;
1264 snd_usb_autosuspend(subs->stream->chip);
1265
1266 return 0;
1267 }
1268
1269 /* Since a URB can handle only a single linear buffer, we must use double
1270 * buffering when the data to be transferred overflows the buffer boundary.
1271 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1272 * for all URBs.
1273 */
1274 static void retire_capture_urb(struct snd_usb_substream *subs,
1275 struct urb *urb)
1276 {
1277 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1278 unsigned int stride, frames, bytes, oldptr;
1279 int i, period_elapsed = 0;
1280 unsigned long flags;
1281 unsigned char *cp;
1282 int current_frame_number;
1283
1284 /* read frame number here, update pointer in critical section */
1285 current_frame_number = usb_get_current_frame_number(subs->dev);
1286
1287 stride = runtime->frame_bits >> 3;
1288
1289 for (i = 0; i < urb->number_of_packets; i++) {
1290 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1291 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1292 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1293 i, urb->iso_frame_desc[i].status);
1294 // continue;
1295 }
1296 bytes = urb->iso_frame_desc[i].actual_length;
1297 frames = bytes / stride;
1298 if (!subs->txfr_quirk)
1299 bytes = frames * stride;
1300 if (bytes % (runtime->sample_bits >> 3) != 0) {
1301 int oldbytes = bytes;
1302 bytes = frames * stride;
1303 dev_warn_ratelimited(&subs->dev->dev,
1304 "Corrected urb data len. %d->%d\n",
1305 oldbytes, bytes);
1306 }
1307 /* update the current pointer */
1308 spin_lock_irqsave(&subs->lock, flags);
1309 oldptr = subs->hwptr_done;
1310 subs->hwptr_done += bytes;
1311 if (subs->hwptr_done >= runtime->buffer_size * stride)
1312 subs->hwptr_done -= runtime->buffer_size * stride;
1313 frames = (bytes + (oldptr % stride)) / stride;
1314 subs->transfer_done += frames;
1315 if (subs->transfer_done >= runtime->period_size) {
1316 subs->transfer_done -= runtime->period_size;
1317 period_elapsed = 1;
1318 }
1319 /* capture delay is by construction limited to one URB,
1320 * reset delays here
1321 */
1322 runtime->delay = subs->last_delay = 0;
1323
1324 /* realign last_frame_number */
1325 subs->last_frame_number = current_frame_number;
1326 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1327
1328 spin_unlock_irqrestore(&subs->lock, flags);
1329 /* copy a data chunk */
1330 if (oldptr + bytes > runtime->buffer_size * stride) {
1331 unsigned int bytes1 =
1332 runtime->buffer_size * stride - oldptr;
1333 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1334 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1335 } else {
1336 memcpy(runtime->dma_area + oldptr, cp, bytes);
1337 }
1338 }
1339
1340 if (period_elapsed)
1341 snd_pcm_period_elapsed(subs->pcm_substream);
1342 }
1343
1344 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1345 struct urb *urb, unsigned int bytes)
1346 {
1347 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1348 unsigned int stride = runtime->frame_bits >> 3;
1349 unsigned int dst_idx = 0;
1350 unsigned int src_idx = subs->hwptr_done;
1351 unsigned int wrap = runtime->buffer_size * stride;
1352 u8 *dst = urb->transfer_buffer;
1353 u8 *src = runtime->dma_area;
1354 u8 marker[] = { 0x05, 0xfa };
1355
1356 /*
1357 * The DSP DOP format defines a way to transport DSD samples over
1358 * normal PCM data endpoints. It requires stuffing of marker bytes
1359 * (0x05 and 0xfa, alternating per sample frame), and then expects
1360 * 2 additional bytes of actual payload. The whole frame is stored
1361 * LSB.
1362 *
1363 * Hence, for a stereo transport, the buffer layout looks like this,
1364 * where L refers to left channel samples and R to right.
1365 *
1366 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1367 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1368 * .....
1369 *
1370 */
1371
1372 while (bytes--) {
1373 if (++subs->dsd_dop.byte_idx == 3) {
1374 /* frame boundary? */
1375 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1376 src_idx += 2;
1377 subs->dsd_dop.byte_idx = 0;
1378
1379 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1380 /* alternate the marker */
1381 subs->dsd_dop.marker++;
1382 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1383 subs->dsd_dop.channel = 0;
1384 }
1385 } else {
1386 /* stuff the DSD payload */
1387 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1388
1389 if (subs->cur_audiofmt->dsd_bitrev)
1390 dst[dst_idx++] = bitrev8(src[idx]);
1391 else
1392 dst[dst_idx++] = src[idx];
1393
1394 subs->hwptr_done++;
1395 }
1396 }
1397 if (subs->hwptr_done >= runtime->buffer_size * stride)
1398 subs->hwptr_done -= runtime->buffer_size * stride;
1399 }
1400
1401 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1402 int offset, int stride, unsigned int bytes)
1403 {
1404 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1405
1406 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1407 /* err, the transferred area goes over buffer boundary. */
1408 unsigned int bytes1 =
1409 runtime->buffer_size * stride - subs->hwptr_done;
1410 memcpy(urb->transfer_buffer + offset,
1411 runtime->dma_area + subs->hwptr_done, bytes1);
1412 memcpy(urb->transfer_buffer + offset + bytes1,
1413 runtime->dma_area, bytes - bytes1);
1414 } else {
1415 memcpy(urb->transfer_buffer + offset,
1416 runtime->dma_area + subs->hwptr_done, bytes);
1417 }
1418 subs->hwptr_done += bytes;
1419 if (subs->hwptr_done >= runtime->buffer_size * stride)
1420 subs->hwptr_done -= runtime->buffer_size * stride;
1421 }
1422
1423 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1424 struct urb *urb, int stride,
1425 unsigned int bytes)
1426 {
1427 __le32 packet_length;
1428 int i;
1429
1430 /* Put __le32 length descriptor at start of each packet. */
1431 for (i = 0; i < urb->number_of_packets; i++) {
1432 unsigned int length = urb->iso_frame_desc[i].length;
1433 unsigned int offset = urb->iso_frame_desc[i].offset;
1434
1435 packet_length = cpu_to_le32(length);
1436 offset += i * sizeof(packet_length);
1437 urb->iso_frame_desc[i].offset = offset;
1438 urb->iso_frame_desc[i].length += sizeof(packet_length);
1439 memcpy(urb->transfer_buffer + offset,
1440 &packet_length, sizeof(packet_length));
1441 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1442 stride, length);
1443 }
1444 /* Adjust transfer size accordingly. */
1445 bytes += urb->number_of_packets * sizeof(packet_length);
1446 return bytes;
1447 }
1448
1449 static void prepare_playback_urb(struct snd_usb_substream *subs,
1450 struct urb *urb)
1451 {
1452 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1453 struct snd_usb_endpoint *ep = subs->data_endpoint;
1454 struct snd_urb_ctx *ctx = urb->context;
1455 unsigned int counts, frames, bytes;
1456 int i, stride, period_elapsed = 0;
1457 unsigned long flags;
1458
1459 stride = runtime->frame_bits >> 3;
1460
1461 frames = 0;
1462 urb->number_of_packets = 0;
1463 spin_lock_irqsave(&subs->lock, flags);
1464 subs->frame_limit += ep->max_urb_frames;
1465 for (i = 0; i < ctx->packets; i++) {
1466 if (ctx->packet_size[i])
1467 counts = ctx->packet_size[i];
1468 else
1469 counts = snd_usb_endpoint_next_packet_size(ep);
1470
1471 /* set up descriptor */
1472 urb->iso_frame_desc[i].offset = frames * ep->stride;
1473 urb->iso_frame_desc[i].length = counts * ep->stride;
1474 frames += counts;
1475 urb->number_of_packets++;
1476 subs->transfer_done += counts;
1477 if (subs->transfer_done >= runtime->period_size) {
1478 subs->transfer_done -= runtime->period_size;
1479 subs->frame_limit = 0;
1480 period_elapsed = 1;
1481 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1482 if (subs->transfer_done > 0) {
1483 /* FIXME: fill-max mode is not
1484 * supported yet */
1485 frames -= subs->transfer_done;
1486 counts -= subs->transfer_done;
1487 urb->iso_frame_desc[i].length =
1488 counts * ep->stride;
1489 subs->transfer_done = 0;
1490 }
1491 i++;
1492 if (i < ctx->packets) {
1493 /* add a transfer delimiter */
1494 urb->iso_frame_desc[i].offset =
1495 frames * ep->stride;
1496 urb->iso_frame_desc[i].length = 0;
1497 urb->number_of_packets++;
1498 }
1499 break;
1500 }
1501 }
1502 /* finish at the period boundary or after enough frames */
1503 if ((period_elapsed ||
1504 subs->transfer_done >= subs->frame_limit) &&
1505 !snd_usb_endpoint_implicit_feedback_sink(ep))
1506 break;
1507 }
1508 bytes = frames * ep->stride;
1509
1510 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1511 subs->cur_audiofmt->dsd_dop)) {
1512 fill_playback_urb_dsd_dop(subs, urb, bytes);
1513 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1514 subs->cur_audiofmt->dsd_bitrev)) {
1515 /* bit-reverse the bytes */
1516 u8 *buf = urb->transfer_buffer;
1517 for (i = 0; i < bytes; i++) {
1518 int idx = (subs->hwptr_done + i)
1519 % (runtime->buffer_size * stride);
1520 buf[i] = bitrev8(runtime->dma_area[idx]);
1521 }
1522
1523 subs->hwptr_done += bytes;
1524 if (subs->hwptr_done >= runtime->buffer_size * stride)
1525 subs->hwptr_done -= runtime->buffer_size * stride;
1526 } else {
1527 /* usual PCM */
1528 if (!subs->tx_length_quirk)
1529 copy_to_urb(subs, urb, 0, stride, bytes);
1530 else
1531 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1532 /* bytes is now amount of outgoing data */
1533 }
1534
1535 /* update delay with exact number of samples queued */
1536 runtime->delay = subs->last_delay;
1537 runtime->delay += frames;
1538 subs->last_delay = runtime->delay;
1539
1540 /* realign last_frame_number */
1541 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1542 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1543
1544 if (subs->trigger_tstamp_pending_update) {
1545 /* this is the first actual URB submitted,
1546 * update trigger timestamp to reflect actual start time
1547 */
1548 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1549 subs->trigger_tstamp_pending_update = false;
1550 }
1551
1552 spin_unlock_irqrestore(&subs->lock, flags);
1553 urb->transfer_buffer_length = bytes;
1554 if (period_elapsed)
1555 snd_pcm_period_elapsed(subs->pcm_substream);
1556 }
1557
1558 /*
1559 * process after playback data complete
1560 * - decrease the delay count again
1561 */
1562 static void retire_playback_urb(struct snd_usb_substream *subs,
1563 struct urb *urb)
1564 {
1565 unsigned long flags;
1566 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1567 struct snd_usb_endpoint *ep = subs->data_endpoint;
1568 int processed = urb->transfer_buffer_length / ep->stride;
1569 int est_delay;
1570
1571 /* ignore the delay accounting when procssed=0 is given, i.e.
1572 * silent payloads are procssed before handling the actual data
1573 */
1574 if (!processed)
1575 return;
1576
1577 spin_lock_irqsave(&subs->lock, flags);
1578 if (!subs->last_delay)
1579 goto out; /* short path */
1580
1581 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1582 /* update delay with exact number of samples played */
1583 if (processed > subs->last_delay)
1584 subs->last_delay = 0;
1585 else
1586 subs->last_delay -= processed;
1587 runtime->delay = subs->last_delay;
1588
1589 /*
1590 * Report when delay estimate is off by more than 2ms.
1591 * The error should be lower than 2ms since the estimate relies
1592 * on two reads of a counter updated every ms.
1593 */
1594 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1595 dev_dbg_ratelimited(&subs->dev->dev,
1596 "delay: estimated %d, actual %d\n",
1597 est_delay, subs->last_delay);
1598
1599 if (!subs->running) {
1600 /* update last_frame_number for delay counting here since
1601 * prepare_playback_urb won't be called during pause
1602 */
1603 subs->last_frame_number =
1604 usb_get_current_frame_number(subs->dev) & 0xff;
1605 }
1606
1607 out:
1608 spin_unlock_irqrestore(&subs->lock, flags);
1609 }
1610
1611 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1612 {
1613 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1614 }
1615
1616 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1617 {
1618 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1619 }
1620
1621 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1622 {
1623 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1624 }
1625
1626 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1627 {
1628 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1629 }
1630
1631 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1632 int cmd)
1633 {
1634 struct snd_usb_substream *subs = substream->runtime->private_data;
1635
1636 switch (cmd) {
1637 case SNDRV_PCM_TRIGGER_START:
1638 subs->trigger_tstamp_pending_update = true;
1639 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1640 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1641 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1642 subs->running = 1;
1643 return 0;
1644 case SNDRV_PCM_TRIGGER_STOP:
1645 stop_endpoints(subs, false);
1646 subs->running = 0;
1647 return 0;
1648 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1649 subs->data_endpoint->prepare_data_urb = NULL;
1650 /* keep retire_data_urb for delay calculation */
1651 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1652 subs->running = 0;
1653 return 0;
1654 }
1655
1656 return -EINVAL;
1657 }
1658
1659 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1660 int cmd)
1661 {
1662 int err;
1663 struct snd_usb_substream *subs = substream->runtime->private_data;
1664
1665 switch (cmd) {
1666 case SNDRV_PCM_TRIGGER_START:
1667 err = start_endpoints(subs);
1668 if (err < 0)
1669 return err;
1670
1671 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1672 subs->running = 1;
1673 return 0;
1674 case SNDRV_PCM_TRIGGER_STOP:
1675 stop_endpoints(subs, false);
1676 subs->running = 0;
1677 return 0;
1678 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1679 subs->data_endpoint->retire_data_urb = NULL;
1680 subs->running = 0;
1681 return 0;
1682 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1683 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1684 subs->running = 1;
1685 return 0;
1686 }
1687
1688 return -EINVAL;
1689 }
1690
1691 static struct snd_pcm_ops snd_usb_playback_ops = {
1692 .open = snd_usb_playback_open,
1693 .close = snd_usb_playback_close,
1694 .ioctl = snd_pcm_lib_ioctl,
1695 .hw_params = snd_usb_hw_params,
1696 .hw_free = snd_usb_hw_free,
1697 .prepare = snd_usb_pcm_prepare,
1698 .trigger = snd_usb_substream_playback_trigger,
1699 .pointer = snd_usb_pcm_pointer,
1700 .page = snd_pcm_lib_get_vmalloc_page,
1701 .mmap = snd_pcm_lib_mmap_vmalloc,
1702 };
1703
1704 static struct snd_pcm_ops snd_usb_capture_ops = {
1705 .open = snd_usb_capture_open,
1706 .close = snd_usb_capture_close,
1707 .ioctl = snd_pcm_lib_ioctl,
1708 .hw_params = snd_usb_hw_params,
1709 .hw_free = snd_usb_hw_free,
1710 .prepare = snd_usb_pcm_prepare,
1711 .trigger = snd_usb_substream_capture_trigger,
1712 .pointer = snd_usb_pcm_pointer,
1713 .page = snd_pcm_lib_get_vmalloc_page,
1714 .mmap = snd_pcm_lib_mmap_vmalloc,
1715 };
1716
1717 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1718 {
1719 snd_pcm_set_ops(pcm, stream,
1720 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1721 &snd_usb_playback_ops : &snd_usb_capture_ops);
1722 }
Linux with added FPC-III support