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xtensa: support DMA buffers in high memory
[cris-mirror.git] / sound / usb / pcm.c
blobb9c9a19f9588a8c2eab67e6bd2ad8e5b531c7655
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/bitrev.h>
20 #include <linux/ratelimit.h>
21 #include <linux/usb.h>
22 #include <linux/usb/audio.h>
23 #include <linux/usb/audio-v2.h>
24
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28
29 #include "usbaudio.h"
30 #include "card.h"
31 #include "quirks.h"
32 #include "debug.h"
33 #include "endpoint.h"
34 #include "helper.h"
35 #include "pcm.h"
36 #include "clock.h"
37 #include "power.h"
38
39 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
40 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
41
42 /* return the estimated delay based on USB frame counters */
43 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
44 unsigned int rate)
45 {
46 int current_frame_number;
47 int frame_diff;
48 int est_delay;
49
50 if (!subs->last_delay)
51 return 0; /* short path */
52
53 current_frame_number = usb_get_current_frame_number(subs->dev);
54 /*
55 * HCD implementations use different widths, use lower 8 bits.
56 * The delay will be managed up to 256ms, which is more than
57 * enough
58 */
59 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
60
61 /* Approximation based on number of samples per USB frame (ms),
62 some truncation for 44.1 but the estimate is good enough */
63 est_delay = frame_diff * rate / 1000;
64 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
65 est_delay = subs->last_delay - est_delay;
66 else
67 est_delay = subs->last_delay + est_delay;
68
69 if (est_delay < 0)
70 est_delay = 0;
71 return est_delay;
72 }
73
74 /*
75 * return the current pcm pointer. just based on the hwptr_done value.
76 */
77 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
78 {
79 struct snd_usb_substream *subs;
80 unsigned int hwptr_done;
81
82 subs = (struct snd_usb_substream *)substream->runtime->private_data;
83 if (atomic_read(&subs->stream->chip->shutdown))
84 return SNDRV_PCM_POS_XRUN;
85 spin_lock(&subs->lock);
86 hwptr_done = subs->hwptr_done;
87 substream->runtime->delay = snd_usb_pcm_delay(subs,
88 substream->runtime->rate);
89 spin_unlock(&subs->lock);
90 return hwptr_done / (substream->runtime->frame_bits >> 3);
91 }
92
93 /*
94 * find a matching audio format
95 */
96 static struct audioformat *find_format(struct snd_usb_substream *subs)
97 {
98 struct audioformat *fp;
99 struct audioformat *found = NULL;
100 int cur_attr = 0, attr;
101
102 list_for_each_entry(fp, &subs->fmt_list, list) {
103 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
104 continue;
105 if (fp->channels != subs->channels)
106 continue;
107 if (subs->cur_rate < fp->rate_min ||
108 subs->cur_rate > fp->rate_max)
109 continue;
110 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
111 unsigned int i;
112 for (i = 0; i < fp->nr_rates; i++)
113 if (fp->rate_table[i] == subs->cur_rate)
114 break;
115 if (i >= fp->nr_rates)
116 continue;
117 }
118 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
119 if (! found) {
120 found = fp;
121 cur_attr = attr;
122 continue;
123 }
124 /* avoid async out and adaptive in if the other method
125 * supports the same format.
126 * this is a workaround for the case like
127 * M-audio audiophile USB.
128 */
129 if (attr != cur_attr) {
130 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
131 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
132 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
133 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
134 continue;
135 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
136 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
137 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
138 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
139 found = fp;
140 cur_attr = attr;
141 continue;
142 }
143 }
144 /* find the format with the largest max. packet size */
145 if (fp->maxpacksize > found->maxpacksize) {
146 found = fp;
147 cur_attr = attr;
148 }
149 }
150 return found;
151 }
152
153 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
154 struct usb_host_interface *alts,
155 struct audioformat *fmt)
156 {
157 struct usb_device *dev = chip->dev;
158 unsigned int ep;
159 unsigned char data[1];
160 int err;
161
162 if (get_iface_desc(alts)->bNumEndpoints < 1)
163 return -EINVAL;
164 ep = get_endpoint(alts, 0)->bEndpointAddress;
165
166 data[0] = 1;
167 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
170 data, sizeof(data))) < 0) {
171 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
172 iface, ep);
173 return err;
174 }
175
176 return 0;
177 }
178
179 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
180 struct usb_host_interface *alts,
181 struct audioformat *fmt)
182 {
183 struct usb_device *dev = chip->dev;
184 unsigned char data[1];
185 int err;
186
187 data[0] = 1;
188 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
189 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
190 UAC2_EP_CS_PITCH << 8, 0,
191 data, sizeof(data))) < 0) {
192 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
193 iface, fmt->altsetting);
194 return err;
195 }
196
197 return 0;
198 }
199
200 /*
201 * initialize the pitch control and sample rate
202 */
203 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
204 struct usb_host_interface *alts,
205 struct audioformat *fmt)
206 {
207 /* if endpoint doesn't have pitch control, bail out */
208 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
209 return 0;
210
211 switch (fmt->protocol) {
212 case UAC_VERSION_1:
213 default:
214 return init_pitch_v1(chip, iface, alts, fmt);
215
216 case UAC_VERSION_2:
217 return init_pitch_v2(chip, iface, alts, fmt);
218 }
219 }
220
221 static int start_endpoints(struct snd_usb_substream *subs)
222 {
223 int err;
224
225 if (!subs->data_endpoint)
226 return -EINVAL;
227
228 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
229 struct snd_usb_endpoint *ep = subs->data_endpoint;
230
231 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
232
233 ep->data_subs = subs;
234 err = snd_usb_endpoint_start(ep);
235 if (err < 0) {
236 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
237 return err;
238 }
239 }
240
241 if (subs->sync_endpoint &&
242 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
243 struct snd_usb_endpoint *ep = subs->sync_endpoint;
244
245 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
246 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
247 err = usb_set_interface(subs->dev,
248 subs->sync_endpoint->iface,
249 subs->sync_endpoint->altsetting);
250 if (err < 0) {
251 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
252 dev_err(&subs->dev->dev,
253 "%d:%d: cannot set interface (%d)\n",
254 subs->sync_endpoint->iface,
255 subs->sync_endpoint->altsetting, err);
256 return -EIO;
257 }
258 }
259
260 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
261
262 ep->sync_slave = subs->data_endpoint;
263 err = snd_usb_endpoint_start(ep);
264 if (err < 0) {
265 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
266 return err;
267 }
268 }
269
270 return 0;
271 }
272
273 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
274 {
275 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
276 snd_usb_endpoint_stop(subs->sync_endpoint);
277
278 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
279 snd_usb_endpoint_stop(subs->data_endpoint);
280
281 if (wait) {
282 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
283 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
284 }
285 }
286
287 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
288 unsigned int altsetting,
289 struct usb_host_interface **alts,
290 unsigned int *ep)
291 {
292 struct usb_interface *iface;
293 struct usb_interface_descriptor *altsd;
294 struct usb_endpoint_descriptor *epd;
295
296 iface = usb_ifnum_to_if(dev, ifnum);
297 if (!iface || iface->num_altsetting < altsetting + 1)
298 return -ENOENT;
299 *alts = &iface->altsetting[altsetting];
300 altsd = get_iface_desc(*alts);
301 if (altsd->bAlternateSetting != altsetting ||
302 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
303 (altsd->bInterfaceSubClass != 2 &&
304 altsd->bInterfaceProtocol != 2 ) ||
305 altsd->bNumEndpoints < 1)
306 return -ENOENT;
307 epd = get_endpoint(*alts, 0);
308 if (!usb_endpoint_is_isoc_in(epd) ||
309 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
310 USB_ENDPOINT_USAGE_IMPLICIT_FB)
311 return -ENOENT;
312 *ep = epd->bEndpointAddress;
313 return 0;
314 }
315
316 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
317 struct usb_device *dev,
318 struct usb_interface_descriptor *altsd,
319 unsigned int attr)
320 {
321 struct usb_host_interface *alts;
322 struct usb_interface *iface;
323 unsigned int ep;
324
325 /* Implicit feedback sync EPs consumers are always playback EPs */
326 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
327 return 0;
328
329 switch (subs->stream->chip->usb_id) {
330 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
331 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
332 ep = 0x81;
333 iface = usb_ifnum_to_if(dev, 3);
334
335 if (!iface || iface->num_altsetting == 0)
336 return -EINVAL;
337
338 alts = &iface->altsetting[1];
339 goto add_sync_ep;
340 break;
341 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
342 case USB_ID(0x0763, 0x2081):
343 ep = 0x81;
344 iface = usb_ifnum_to_if(dev, 2);
345
346 if (!iface || iface->num_altsetting == 0)
347 return -EINVAL;
348
349 alts = &iface->altsetting[1];
350 goto add_sync_ep;
351 case USB_ID(0x2466, 0x8003):
352 ep = 0x86;
353 iface = usb_ifnum_to_if(dev, 2);
354
355 if (!iface || iface->num_altsetting == 0)
356 return -EINVAL;
357
358 alts = &iface->altsetting[1];
359 goto add_sync_ep;
360
361 }
362 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
363 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
364 altsd->bInterfaceProtocol == 2 &&
365 altsd->bNumEndpoints == 1 &&
366 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
367 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
368 altsd->bAlternateSetting,
369 &alts, &ep) >= 0) {
370 goto add_sync_ep;
371 }
372
373 /* No quirk */
374 return 0;
375
376 add_sync_ep:
377 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
378 alts, ep, !subs->direction,
379 SND_USB_ENDPOINT_TYPE_DATA);
380 if (!subs->sync_endpoint)
381 return -EINVAL;
382
383 subs->data_endpoint->sync_master = subs->sync_endpoint;
384
385 return 0;
386 }
387
388 static int set_sync_endpoint(struct snd_usb_substream *subs,
389 struct audioformat *fmt,
390 struct usb_device *dev,
391 struct usb_host_interface *alts,
392 struct usb_interface_descriptor *altsd)
393 {
394 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
395 unsigned int ep, attr;
396 bool implicit_fb;
397 int err;
398
399 /* we need a sync pipe in async OUT or adaptive IN mode */
400 /* check the number of EP, since some devices have broken
401 * descriptors which fool us. if it has only one EP,
402 * assume it as adaptive-out or sync-in.
403 */
404 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
405
406 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
407 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
408
409 /*
410 * In these modes the notion of sync_endpoint is irrelevant.
411 * Reset pointers to avoid using stale data from previously
412 * used settings, e.g. when configuration and endpoints were
413 * changed
414 */
415
416 subs->sync_endpoint = NULL;
417 subs->data_endpoint->sync_master = NULL;
418 }
419
420 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
421 if (err < 0)
422 return err;
423
424 if (altsd->bNumEndpoints < 2)
425 return 0;
426
427 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
428 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
429 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
430 return 0;
431
432 /*
433 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
434 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
435 * error fall back to SYNC mode and don't create sync endpoint
436 */
437
438 /* check sync-pipe endpoint */
439 /* ... and check descriptor size before accessing bSynchAddress
440 because there is a version of the SB Audigy 2 NX firmware lacking
441 the audio fields in the endpoint descriptors */
442 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
443 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
444 get_endpoint(alts, 1)->bSynchAddress != 0)) {
445 dev_err(&dev->dev,
446 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
447 fmt->iface, fmt->altsetting,
448 get_endpoint(alts, 1)->bmAttributes,
449 get_endpoint(alts, 1)->bLength,
450 get_endpoint(alts, 1)->bSynchAddress);
451 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
452 return 0;
453 return -EINVAL;
454 }
455 ep = get_endpoint(alts, 1)->bEndpointAddress;
456 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
457 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
458 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
459 dev_err(&dev->dev,
460 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
461 fmt->iface, fmt->altsetting,
462 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
463 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
464 return 0;
465 return -EINVAL;
466 }
467
468 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
469 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
470
471 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
472 alts, ep, !subs->direction,
473 implicit_fb ?
474 SND_USB_ENDPOINT_TYPE_DATA :
475 SND_USB_ENDPOINT_TYPE_SYNC);
476 if (!subs->sync_endpoint) {
477 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
478 return 0;
479 return -EINVAL;
480 }
481
482 subs->data_endpoint->sync_master = subs->sync_endpoint;
483
484 return 0;
485 }
486
487 /*
488 * find a matching format and set up the interface
489 */
490 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
491 {
492 struct usb_device *dev = subs->dev;
493 struct usb_host_interface *alts;
494 struct usb_interface_descriptor *altsd;
495 struct usb_interface *iface;
496 int err;
497
498 iface = usb_ifnum_to_if(dev, fmt->iface);
499 if (WARN_ON(!iface))
500 return -EINVAL;
501 alts = &iface->altsetting[fmt->altset_idx];
502 altsd = get_iface_desc(alts);
503 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
504 return -EINVAL;
505
506 if (fmt == subs->cur_audiofmt)
507 return 0;
508
509 /* close the old interface */
510 if (subs->interface >= 0 && subs->interface != fmt->iface) {
511 err = usb_set_interface(subs->dev, subs->interface, 0);
512 if (err < 0) {
513 dev_err(&dev->dev,
514 "%d:%d: return to setting 0 failed (%d)\n",
515 fmt->iface, fmt->altsetting, err);
516 return -EIO;
517 }
518 subs->interface = -1;
519 subs->altset_idx = 0;
520 }
521
522 /* set interface */
523 if (subs->interface != fmt->iface ||
524 subs->altset_idx != fmt->altset_idx) {
525
526 err = snd_usb_select_mode_quirk(subs, fmt);
527 if (err < 0)
528 return -EIO;
529
530 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
531 if (err < 0) {
532 dev_err(&dev->dev,
533 "%d:%d: usb_set_interface failed (%d)\n",
534 fmt->iface, fmt->altsetting, err);
535 return -EIO;
536 }
537 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
538 fmt->iface, fmt->altsetting);
539 subs->interface = fmt->iface;
540 subs->altset_idx = fmt->altset_idx;
541
542 snd_usb_set_interface_quirk(dev);
543 }
544
545 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
546 alts, fmt->endpoint, subs->direction,
547 SND_USB_ENDPOINT_TYPE_DATA);
548
549 if (!subs->data_endpoint)
550 return -EINVAL;
551
552 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
553 if (err < 0)
554 return err;
555
556 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
557 if (err < 0)
558 return err;
559
560 subs->cur_audiofmt = fmt;
561
562 snd_usb_set_format_quirk(subs, fmt);
563
564 return 0;
565 }
566
567 /*
568 * Return the score of matching two audioformats.
569 * Veto the audioformat if:
570 * - It has no channels for some reason.
571 * - Requested PCM format is not supported.
572 * - Requested sample rate is not supported.
573 */
574 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
575 struct audioformat *fp,
576 struct audioformat *match, int rate,
577 snd_pcm_format_t pcm_format)
578 {
579 int i;
580 int score = 0;
581
582 if (fp->channels < 1) {
583 dev_dbg(&subs->dev->dev,
584 "%s: (fmt @%p) no channels\n", __func__, fp);
585 return 0;
586 }
587
588 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
589 dev_dbg(&subs->dev->dev,
590 "%s: (fmt @%p) no match for format %d\n", __func__,
591 fp, pcm_format);
592 return 0;
593 }
594
595 for (i = 0; i < fp->nr_rates; i++) {
596 if (fp->rate_table[i] == rate) {
597 score++;
598 break;
599 }
600 }
601 if (!score) {
602 dev_dbg(&subs->dev->dev,
603 "%s: (fmt @%p) no match for rate %d\n", __func__,
604 fp, rate);
605 return 0;
606 }
607
608 if (fp->channels == match->channels)
609 score++;
610
611 dev_dbg(&subs->dev->dev,
612 "%s: (fmt @%p) score %d\n", __func__, fp, score);
613
614 return score;
615 }
616
617 /*
618 * Configure the sync ep using the rate and pcm format of the data ep.
619 */
620 static int configure_sync_endpoint(struct snd_usb_substream *subs)
621 {
622 int ret;
623 struct audioformat *fp;
624 struct audioformat *sync_fp = NULL;
625 int cur_score = 0;
626 int sync_period_bytes = subs->period_bytes;
627 struct snd_usb_substream *sync_subs =
628 &subs->stream->substream[subs->direction ^ 1];
629
630 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
631 !subs->stream)
632 return snd_usb_endpoint_set_params(subs->sync_endpoint,
633 subs->pcm_format,
634 subs->channels,
635 subs->period_bytes,
636 0, 0,
637 subs->cur_rate,
638 subs->cur_audiofmt,
639 NULL);
640
641 /* Try to find the best matching audioformat. */
642 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
643 int score = match_endpoint_audioformats(subs,
644 fp, subs->cur_audiofmt,
645 subs->cur_rate, subs->pcm_format);
646
647 if (score > cur_score) {
648 sync_fp = fp;
649 cur_score = score;
650 }
651 }
652
653 if (unlikely(sync_fp == NULL)) {
654 dev_err(&subs->dev->dev,
655 "%s: no valid audioformat for sync ep %x found\n",
656 __func__, sync_subs->ep_num);
657 return -EINVAL;
658 }
659
660 /*
661 * Recalculate the period bytes if channel number differ between
662 * data and sync ep audioformat.
663 */
664 if (sync_fp->channels != subs->channels) {
665 sync_period_bytes = (subs->period_bytes / subs->channels) *
666 sync_fp->channels;
667 dev_dbg(&subs->dev->dev,
668 "%s: adjusted sync ep period bytes (%d -> %d)\n",
669 __func__, subs->period_bytes, sync_period_bytes);
670 }
671
672 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
673 subs->pcm_format,
674 sync_fp->channels,
675 sync_period_bytes,
676 0, 0,
677 subs->cur_rate,
678 sync_fp,
679 NULL);
680
681 return ret;
682 }
683
684 /*
685 * configure endpoint params
686 *
687 * called during initial setup and upon resume
688 */
689 static int configure_endpoint(struct snd_usb_substream *subs)
690 {
691 int ret;
692
693 /* format changed */
694 stop_endpoints(subs, true);
695 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
696 subs->pcm_format,
697 subs->channels,
698 subs->period_bytes,
699 subs->period_frames,
700 subs->buffer_periods,
701 subs->cur_rate,
702 subs->cur_audiofmt,
703 subs->sync_endpoint);
704 if (ret < 0)
705 return ret;
706
707 if (subs->sync_endpoint)
708 ret = configure_sync_endpoint(subs);
709
710 return ret;
711 }
712
713 /*
714 * hw_params callback
715 *
716 * allocate a buffer and set the given audio format.
717 *
718 * so far we use a physically linear buffer although packetize transfer
719 * doesn't need a continuous area.
720 * if sg buffer is supported on the later version of alsa, we'll follow
721 * that.
722 */
723 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
724 struct snd_pcm_hw_params *hw_params)
725 {
726 struct snd_usb_substream *subs = substream->runtime->private_data;
727 struct audioformat *fmt;
728 int ret;
729
730 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
731 params_buffer_bytes(hw_params));
732 if (ret < 0)
733 return ret;
734
735 subs->pcm_format = params_format(hw_params);
736 subs->period_bytes = params_period_bytes(hw_params);
737 subs->period_frames = params_period_size(hw_params);
738 subs->buffer_periods = params_periods(hw_params);
739 subs->channels = params_channels(hw_params);
740 subs->cur_rate = params_rate(hw_params);
741
742 fmt = find_format(subs);
743 if (!fmt) {
744 dev_dbg(&subs->dev->dev,
745 "cannot set format: format = %#x, rate = %d, channels = %d\n",
746 subs->pcm_format, subs->cur_rate, subs->channels);
747 return -EINVAL;
748 }
749
750 ret = snd_usb_lock_shutdown(subs->stream->chip);
751 if (ret < 0)
752 return ret;
753 ret = set_format(subs, fmt);
754 snd_usb_unlock_shutdown(subs->stream->chip);
755 if (ret < 0)
756 return ret;
757
758 subs->interface = fmt->iface;
759 subs->altset_idx = fmt->altset_idx;
760 subs->need_setup_ep = true;
761
762 return 0;
763 }
764
765 /*
766 * hw_free callback
767 *
768 * reset the audio format and release the buffer
769 */
770 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
771 {
772 struct snd_usb_substream *subs = substream->runtime->private_data;
773
774 subs->cur_audiofmt = NULL;
775 subs->cur_rate = 0;
776 subs->period_bytes = 0;
777 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
778 stop_endpoints(subs, true);
779 snd_usb_endpoint_deactivate(subs->sync_endpoint);
780 snd_usb_endpoint_deactivate(subs->data_endpoint);
781 snd_usb_unlock_shutdown(subs->stream->chip);
782 }
783 return snd_pcm_lib_free_vmalloc_buffer(substream);
784 }
785
786 /*
787 * prepare callback
788 *
789 * only a few subtle things...
790 */
791 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
792 {
793 struct snd_pcm_runtime *runtime = substream->runtime;
794 struct snd_usb_substream *subs = runtime->private_data;
795 struct usb_host_interface *alts;
796 struct usb_interface *iface;
797 int ret;
798
799 if (! subs->cur_audiofmt) {
800 dev_err(&subs->dev->dev, "no format is specified!\n");
801 return -ENXIO;
802 }
803
804 ret = snd_usb_lock_shutdown(subs->stream->chip);
805 if (ret < 0)
806 return ret;
807 if (snd_BUG_ON(!subs->data_endpoint)) {
808 ret = -EIO;
809 goto unlock;
810 }
811
812 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
813 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
814
815 ret = set_format(subs, subs->cur_audiofmt);
816 if (ret < 0)
817 goto unlock;
818
819 if (subs->need_setup_ep) {
820
821 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
822 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
823 ret = snd_usb_init_sample_rate(subs->stream->chip,
824 subs->cur_audiofmt->iface,
825 alts,
826 subs->cur_audiofmt,
827 subs->cur_rate);
828 if (ret < 0)
829 goto unlock;
830
831 ret = configure_endpoint(subs);
832 if (ret < 0)
833 goto unlock;
834 subs->need_setup_ep = false;
835 }
836
837 /* some unit conversions in runtime */
838 subs->data_endpoint->maxframesize =
839 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
840 subs->data_endpoint->curframesize =
841 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
842
843 /* reset the pointer */
844 subs->hwptr_done = 0;
845 subs->transfer_done = 0;
846 subs->last_delay = 0;
847 subs->last_frame_number = 0;
848 runtime->delay = 0;
849
850 /* for playback, submit the URBs now; otherwise, the first hwptr_done
851 * updates for all URBs would happen at the same time when starting */
852 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
853 ret = start_endpoints(subs);
854
855 unlock:
856 snd_usb_unlock_shutdown(subs->stream->chip);
857 return ret;
858 }
859
860 static const struct snd_pcm_hardware snd_usb_hardware =
861 {
862 .info = SNDRV_PCM_INFO_MMAP |
863 SNDRV_PCM_INFO_MMAP_VALID |
864 SNDRV_PCM_INFO_BATCH |
865 SNDRV_PCM_INFO_INTERLEAVED |
866 SNDRV_PCM_INFO_BLOCK_TRANSFER |
867 SNDRV_PCM_INFO_PAUSE,
868 .buffer_bytes_max = 1024 * 1024,
869 .period_bytes_min = 64,
870 .period_bytes_max = 512 * 1024,
871 .periods_min = 2,
872 .periods_max = 1024,
873 };
874
875 static int hw_check_valid_format(struct snd_usb_substream *subs,
876 struct snd_pcm_hw_params *params,
877 struct audioformat *fp)
878 {
879 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
880 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
881 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
882 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
883 struct snd_mask check_fmts;
884 unsigned int ptime;
885
886 /* check the format */
887 snd_mask_none(&check_fmts);
888 check_fmts.bits[0] = (u32)fp->formats;
889 check_fmts.bits[1] = (u32)(fp->formats >> 32);
890 snd_mask_intersect(&check_fmts, fmts);
891 if (snd_mask_empty(&check_fmts)) {
892 hwc_debug(" > check: no supported format %d\n", fp->format);
893 return 0;
894 }
895 /* check the channels */
896 if (fp->channels < ct->min || fp->channels > ct->max) {
897 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
898 return 0;
899 }
900 /* check the rate is within the range */
901 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
902 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
903 return 0;
904 }
905 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
906 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
907 return 0;
908 }
909 /* check whether the period time is >= the data packet interval */
910 if (subs->speed != USB_SPEED_FULL) {
911 ptime = 125 * (1 << fp->datainterval);
912 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
913 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
914 return 0;
915 }
916 }
917 return 1;
918 }
919
920 static int hw_rule_rate(struct snd_pcm_hw_params *params,
921 struct snd_pcm_hw_rule *rule)
922 {
923 struct snd_usb_substream *subs = rule->private;
924 struct audioformat *fp;
925 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
926 unsigned int rmin, rmax;
927 int changed;
928
929 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
930 changed = 0;
931 rmin = rmax = 0;
932 list_for_each_entry(fp, &subs->fmt_list, list) {
933 if (!hw_check_valid_format(subs, params, fp))
934 continue;
935 if (changed++) {
936 if (rmin > fp->rate_min)
937 rmin = fp->rate_min;
938 if (rmax < fp->rate_max)
939 rmax = fp->rate_max;
940 } else {
941 rmin = fp->rate_min;
942 rmax = fp->rate_max;
943 }
944 }
945
946 if (!changed) {
947 hwc_debug(" --> get empty\n");
948 it->empty = 1;
949 return -EINVAL;
950 }
951
952 changed = 0;
953 if (it->min < rmin) {
954 it->min = rmin;
955 it->openmin = 0;
956 changed = 1;
957 }
958 if (it->max > rmax) {
959 it->max = rmax;
960 it->openmax = 0;
961 changed = 1;
962 }
963 if (snd_interval_checkempty(it)) {
964 it->empty = 1;
965 return -EINVAL;
966 }
967 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
968 return changed;
969 }
970
971
972 static int hw_rule_channels(struct snd_pcm_hw_params *params,
973 struct snd_pcm_hw_rule *rule)
974 {
975 struct snd_usb_substream *subs = rule->private;
976 struct audioformat *fp;
977 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
978 unsigned int rmin, rmax;
979 int changed;
980
981 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
982 changed = 0;
983 rmin = rmax = 0;
984 list_for_each_entry(fp, &subs->fmt_list, list) {
985 if (!hw_check_valid_format(subs, params, fp))
986 continue;
987 if (changed++) {
988 if (rmin > fp->channels)
989 rmin = fp->channels;
990 if (rmax < fp->channels)
991 rmax = fp->channels;
992 } else {
993 rmin = fp->channels;
994 rmax = fp->channels;
995 }
996 }
997
998 if (!changed) {
999 hwc_debug(" --> get empty\n");
1000 it->empty = 1;
1001 return -EINVAL;
1002 }
1003
1004 changed = 0;
1005 if (it->min < rmin) {
1006 it->min = rmin;
1007 it->openmin = 0;
1008 changed = 1;
1009 }
1010 if (it->max > rmax) {
1011 it->max = rmax;
1012 it->openmax = 0;
1013 changed = 1;
1014 }
1015 if (snd_interval_checkempty(it)) {
1016 it->empty = 1;
1017 return -EINVAL;
1018 }
1019 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1020 return changed;
1021 }
1022
1023 static int hw_rule_format(struct snd_pcm_hw_params *params,
1024 struct snd_pcm_hw_rule *rule)
1025 {
1026 struct snd_usb_substream *subs = rule->private;
1027 struct audioformat *fp;
1028 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1029 u64 fbits;
1030 u32 oldbits[2];
1031 int changed;
1032
1033 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1034 fbits = 0;
1035 list_for_each_entry(fp, &subs->fmt_list, list) {
1036 if (!hw_check_valid_format(subs, params, fp))
1037 continue;
1038 fbits |= fp->formats;
1039 }
1040
1041 oldbits[0] = fmt->bits[0];
1042 oldbits[1] = fmt->bits[1];
1043 fmt->bits[0] &= (u32)fbits;
1044 fmt->bits[1] &= (u32)(fbits >> 32);
1045 if (!fmt->bits[0] && !fmt->bits[1]) {
1046 hwc_debug(" --> get empty\n");
1047 return -EINVAL;
1048 }
1049 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1050 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1051 return changed;
1052 }
1053
1054 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1055 struct snd_pcm_hw_rule *rule)
1056 {
1057 struct snd_usb_substream *subs = rule->private;
1058 struct audioformat *fp;
1059 struct snd_interval *it;
1060 unsigned char min_datainterval;
1061 unsigned int pmin;
1062 int changed;
1063
1064 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1065 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1066 min_datainterval = 0xff;
1067 list_for_each_entry(fp, &subs->fmt_list, list) {
1068 if (!hw_check_valid_format(subs, params, fp))
1069 continue;
1070 min_datainterval = min(min_datainterval, fp->datainterval);
1071 }
1072 if (min_datainterval == 0xff) {
1073 hwc_debug(" --> get empty\n");
1074 it->empty = 1;
1075 return -EINVAL;
1076 }
1077 pmin = 125 * (1 << min_datainterval);
1078 changed = 0;
1079 if (it->min < pmin) {
1080 it->min = pmin;
1081 it->openmin = 0;
1082 changed = 1;
1083 }
1084 if (snd_interval_checkempty(it)) {
1085 it->empty = 1;
1086 return -EINVAL;
1087 }
1088 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1089 return changed;
1090 }
1091
1092 /*
1093 * If the device supports unusual bit rates, does the request meet these?
1094 */
1095 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1096 struct snd_usb_substream *subs)
1097 {
1098 struct audioformat *fp;
1099 int *rate_list;
1100 int count = 0, needs_knot = 0;
1101 int err;
1102
1103 kfree(subs->rate_list.list);
1104 subs->rate_list.list = NULL;
1105
1106 list_for_each_entry(fp, &subs->fmt_list, list) {
1107 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1108 return 0;
1109 count += fp->nr_rates;
1110 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1111 needs_knot = 1;
1112 }
1113 if (!needs_knot)
1114 return 0;
1115
1116 subs->rate_list.list = rate_list =
1117 kmalloc(sizeof(int) * count, GFP_KERNEL);
1118 if (!subs->rate_list.list)
1119 return -ENOMEM;
1120 subs->rate_list.count = count;
1121 subs->rate_list.mask = 0;
1122 count = 0;
1123 list_for_each_entry(fp, &subs->fmt_list, list) {
1124 int i;
1125 for (i = 0; i < fp->nr_rates; i++)
1126 rate_list[count++] = fp->rate_table[i];
1127 }
1128 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1129 &subs->rate_list);
1130 if (err < 0)
1131 return err;
1132
1133 return 0;
1134 }
1135
1136
1137 /*
1138 * set up the runtime hardware information.
1139 */
1140
1141 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1142 {
1143 struct audioformat *fp;
1144 unsigned int pt, ptmin;
1145 int param_period_time_if_needed;
1146 int err;
1147
1148 runtime->hw.formats = subs->formats;
1149
1150 runtime->hw.rate_min = 0x7fffffff;
1151 runtime->hw.rate_max = 0;
1152 runtime->hw.channels_min = 256;
1153 runtime->hw.channels_max = 0;
1154 runtime->hw.rates = 0;
1155 ptmin = UINT_MAX;
1156 /* check min/max rates and channels */
1157 list_for_each_entry(fp, &subs->fmt_list, list) {
1158 runtime->hw.rates |= fp->rates;
1159 if (runtime->hw.rate_min > fp->rate_min)
1160 runtime->hw.rate_min = fp->rate_min;
1161 if (runtime->hw.rate_max < fp->rate_max)
1162 runtime->hw.rate_max = fp->rate_max;
1163 if (runtime->hw.channels_min > fp->channels)
1164 runtime->hw.channels_min = fp->channels;
1165 if (runtime->hw.channels_max < fp->channels)
1166 runtime->hw.channels_max = fp->channels;
1167 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1168 /* FIXME: there might be more than one audio formats... */
1169 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1170 fp->frame_size;
1171 }
1172 pt = 125 * (1 << fp->datainterval);
1173 ptmin = min(ptmin, pt);
1174 }
1175 err = snd_usb_autoresume(subs->stream->chip);
1176 if (err < 0)
1177 return err;
1178
1179 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1180 if (subs->speed == USB_SPEED_FULL)
1181 /* full speed devices have fixed data packet interval */
1182 ptmin = 1000;
1183 if (ptmin == 1000)
1184 /* if period time doesn't go below 1 ms, no rules needed */
1185 param_period_time_if_needed = -1;
1186 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1187 ptmin, UINT_MAX);
1188
1189 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1190 hw_rule_rate, subs,
1191 SNDRV_PCM_HW_PARAM_FORMAT,
1192 SNDRV_PCM_HW_PARAM_CHANNELS,
1193 param_period_time_if_needed,
1194 -1)) < 0)
1195 goto rep_err;
1196 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1197 hw_rule_channels, subs,
1198 SNDRV_PCM_HW_PARAM_FORMAT,
1199 SNDRV_PCM_HW_PARAM_RATE,
1200 param_period_time_if_needed,
1201 -1)) < 0)
1202 goto rep_err;
1203 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1204 hw_rule_format, subs,
1205 SNDRV_PCM_HW_PARAM_RATE,
1206 SNDRV_PCM_HW_PARAM_CHANNELS,
1207 param_period_time_if_needed,
1208 -1)) < 0)
1209 goto rep_err;
1210 if (param_period_time_if_needed >= 0) {
1211 err = snd_pcm_hw_rule_add(runtime, 0,
1212 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1213 hw_rule_period_time, subs,
1214 SNDRV_PCM_HW_PARAM_FORMAT,
1215 SNDRV_PCM_HW_PARAM_CHANNELS,
1216 SNDRV_PCM_HW_PARAM_RATE,
1217 -1);
1218 if (err < 0)
1219 goto rep_err;
1220 }
1221 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1222 goto rep_err;
1223 return 0;
1224
1225 rep_err:
1226 snd_usb_autosuspend(subs->stream->chip);
1227 return err;
1228 }
1229
1230 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1231 {
1232 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1233 struct snd_pcm_runtime *runtime = substream->runtime;
1234 struct snd_usb_substream *subs = &as->substream[direction];
1235
1236 subs->interface = -1;
1237 subs->altset_idx = 0;
1238 runtime->hw = snd_usb_hardware;
1239 runtime->private_data = subs;
1240 subs->pcm_substream = substream;
1241 /* runtime PM is also done there */
1242
1243 /* initialize DSD/DOP context */
1244 subs->dsd_dop.byte_idx = 0;
1245 subs->dsd_dop.channel = 0;
1246 subs->dsd_dop.marker = 1;
1247
1248 return setup_hw_info(runtime, subs);
1249 }
1250
1251 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1252 {
1253 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1254 struct snd_usb_substream *subs = &as->substream[direction];
1255
1256 stop_endpoints(subs, true);
1257
1258 if (subs->interface >= 0 &&
1259 !snd_usb_lock_shutdown(subs->stream->chip)) {
1260 usb_set_interface(subs->dev, subs->interface, 0);
1261 subs->interface = -1;
1262 snd_usb_unlock_shutdown(subs->stream->chip);
1263 }
1264
1265 subs->pcm_substream = NULL;
1266 snd_usb_autosuspend(subs->stream->chip);
1267
1268 return 0;
1269 }
1270
1271 /* Since a URB can handle only a single linear buffer, we must use double
1272 * buffering when the data to be transferred overflows the buffer boundary.
1273 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1274 * for all URBs.
1275 */
1276 static void retire_capture_urb(struct snd_usb_substream *subs,
1277 struct urb *urb)
1278 {
1279 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1280 unsigned int stride, frames, bytes, oldptr;
1281 int i, period_elapsed = 0;
1282 unsigned long flags;
1283 unsigned char *cp;
1284 int current_frame_number;
1285
1286 /* read frame number here, update pointer in critical section */
1287 current_frame_number = usb_get_current_frame_number(subs->dev);
1288
1289 stride = runtime->frame_bits >> 3;
1290
1291 for (i = 0; i < urb->number_of_packets; i++) {
1292 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1293 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1294 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1295 i, urb->iso_frame_desc[i].status);
1296 // continue;
1297 }
1298 bytes = urb->iso_frame_desc[i].actual_length;
1299 frames = bytes / stride;
1300 if (!subs->txfr_quirk)
1301 bytes = frames * stride;
1302 if (bytes % (runtime->sample_bits >> 3) != 0) {
1303 int oldbytes = bytes;
1304 bytes = frames * stride;
1305 dev_warn(&subs->dev->dev,
1306 "Corrected urb data len. %d->%d\n",
1307 oldbytes, bytes);
1308 }
1309 /* update the current pointer */
1310 spin_lock_irqsave(&subs->lock, flags);
1311 oldptr = subs->hwptr_done;
1312 subs->hwptr_done += bytes;
1313 if (subs->hwptr_done >= runtime->buffer_size * stride)
1314 subs->hwptr_done -= runtime->buffer_size * stride;
1315 frames = (bytes + (oldptr % stride)) / stride;
1316 subs->transfer_done += frames;
1317 if (subs->transfer_done >= runtime->period_size) {
1318 subs->transfer_done -= runtime->period_size;
1319 period_elapsed = 1;
1320 }
1321 /* capture delay is by construction limited to one URB,
1322 * reset delays here
1323 */
1324 runtime->delay = subs->last_delay = 0;
1325
1326 /* realign last_frame_number */
1327 subs->last_frame_number = current_frame_number;
1328 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1329
1330 spin_unlock_irqrestore(&subs->lock, flags);
1331 /* copy a data chunk */
1332 if (oldptr + bytes > runtime->buffer_size * stride) {
1333 unsigned int bytes1 =
1334 runtime->buffer_size * stride - oldptr;
1335 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1336 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1337 } else {
1338 memcpy(runtime->dma_area + oldptr, cp, bytes);
1339 }
1340 }
1341
1342 if (period_elapsed)
1343 snd_pcm_period_elapsed(subs->pcm_substream);
1344 }
1345
1346 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1347 struct urb *urb, unsigned int bytes)
1348 {
1349 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1350 unsigned int stride = runtime->frame_bits >> 3;
1351 unsigned int dst_idx = 0;
1352 unsigned int src_idx = subs->hwptr_done;
1353 unsigned int wrap = runtime->buffer_size * stride;
1354 u8 *dst = urb->transfer_buffer;
1355 u8 *src = runtime->dma_area;
1356 u8 marker[] = { 0x05, 0xfa };
1357
1358 /*
1359 * The DSP DOP format defines a way to transport DSD samples over
1360 * normal PCM data endpoints. It requires stuffing of marker bytes
1361 * (0x05 and 0xfa, alternating per sample frame), and then expects
1362 * 2 additional bytes of actual payload. The whole frame is stored
1363 * LSB.
1364 *
1365 * Hence, for a stereo transport, the buffer layout looks like this,
1366 * where L refers to left channel samples and R to right.
1367 *
1368 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1369 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1370 * .....
1371 *
1372 */
1373
1374 while (bytes--) {
1375 if (++subs->dsd_dop.byte_idx == 3) {
1376 /* frame boundary? */
1377 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1378 src_idx += 2;
1379 subs->dsd_dop.byte_idx = 0;
1380
1381 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1382 /* alternate the marker */
1383 subs->dsd_dop.marker++;
1384 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1385 subs->dsd_dop.channel = 0;
1386 }
1387 } else {
1388 /* stuff the DSD payload */
1389 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1390
1391 if (subs->cur_audiofmt->dsd_bitrev)
1392 dst[dst_idx++] = bitrev8(src[idx]);
1393 else
1394 dst[dst_idx++] = src[idx];
1395
1396 subs->hwptr_done++;
1397 }
1398 }
1399 if (subs->hwptr_done >= runtime->buffer_size * stride)
1400 subs->hwptr_done -= runtime->buffer_size * stride;
1401 }
1402
1403 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1404 int offset, int stride, unsigned int bytes)
1405 {
1406 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1407
1408 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1409 /* err, the transferred area goes over buffer boundary. */
1410 unsigned int bytes1 =
1411 runtime->buffer_size * stride - subs->hwptr_done;
1412 memcpy(urb->transfer_buffer + offset,
1413 runtime->dma_area + subs->hwptr_done, bytes1);
1414 memcpy(urb->transfer_buffer + offset + bytes1,
1415 runtime->dma_area, bytes - bytes1);
1416 } else {
1417 memcpy(urb->transfer_buffer + offset,
1418 runtime->dma_area + subs->hwptr_done, bytes);
1419 }
1420 subs->hwptr_done += bytes;
1421 if (subs->hwptr_done >= runtime->buffer_size * stride)
1422 subs->hwptr_done -= runtime->buffer_size * stride;
1423 }
1424
1425 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1426 struct urb *urb, int stride,
1427 unsigned int bytes)
1428 {
1429 __le32 packet_length;
1430 int i;
1431
1432 /* Put __le32 length descriptor at start of each packet. */
1433 for (i = 0; i < urb->number_of_packets; i++) {
1434 unsigned int length = urb->iso_frame_desc[i].length;
1435 unsigned int offset = urb->iso_frame_desc[i].offset;
1436
1437 packet_length = cpu_to_le32(length);
1438 offset += i * sizeof(packet_length);
1439 urb->iso_frame_desc[i].offset = offset;
1440 urb->iso_frame_desc[i].length += sizeof(packet_length);
1441 memcpy(urb->transfer_buffer + offset,
1442 &packet_length, sizeof(packet_length));
1443 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1444 stride, length);
1445 }
1446 /* Adjust transfer size accordingly. */
1447 bytes += urb->number_of_packets * sizeof(packet_length);
1448 return bytes;
1449 }
1450
1451 static void prepare_playback_urb(struct snd_usb_substream *subs,
1452 struct urb *urb)
1453 {
1454 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1455 struct snd_usb_endpoint *ep = subs->data_endpoint;
1456 struct snd_urb_ctx *ctx = urb->context;
1457 unsigned int counts, frames, bytes;
1458 int i, stride, period_elapsed = 0;
1459 unsigned long flags;
1460
1461 stride = runtime->frame_bits >> 3;
1462
1463 frames = 0;
1464 urb->number_of_packets = 0;
1465 spin_lock_irqsave(&subs->lock, flags);
1466 subs->frame_limit += ep->max_urb_frames;
1467 for (i = 0; i < ctx->packets; i++) {
1468 if (ctx->packet_size[i])
1469 counts = ctx->packet_size[i];
1470 else
1471 counts = snd_usb_endpoint_next_packet_size(ep);
1472
1473 /* set up descriptor */
1474 urb->iso_frame_desc[i].offset = frames * ep->stride;
1475 urb->iso_frame_desc[i].length = counts * ep->stride;
1476 frames += counts;
1477 urb->number_of_packets++;
1478 subs->transfer_done += counts;
1479 if (subs->transfer_done >= runtime->period_size) {
1480 subs->transfer_done -= runtime->period_size;
1481 subs->frame_limit = 0;
1482 period_elapsed = 1;
1483 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1484 if (subs->transfer_done > 0) {
1485 /* FIXME: fill-max mode is not
1486 * supported yet */
1487 frames -= subs->transfer_done;
1488 counts -= subs->transfer_done;
1489 urb->iso_frame_desc[i].length =
1490 counts * ep->stride;
1491 subs->transfer_done = 0;
1492 }
1493 i++;
1494 if (i < ctx->packets) {
1495 /* add a transfer delimiter */
1496 urb->iso_frame_desc[i].offset =
1497 frames * ep->stride;
1498 urb->iso_frame_desc[i].length = 0;
1499 urb->number_of_packets++;
1500 }
1501 break;
1502 }
1503 }
1504 /* finish at the period boundary or after enough frames */
1505 if ((period_elapsed ||
1506 subs->transfer_done >= subs->frame_limit) &&
1507 !snd_usb_endpoint_implicit_feedback_sink(ep))
1508 break;
1509 }
1510 bytes = frames * ep->stride;
1511
1512 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1513 subs->cur_audiofmt->dsd_dop)) {
1514 fill_playback_urb_dsd_dop(subs, urb, bytes);
1515 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1516 subs->cur_audiofmt->dsd_bitrev)) {
1517 /* bit-reverse the bytes */
1518 u8 *buf = urb->transfer_buffer;
1519 for (i = 0; i < bytes; i++) {
1520 int idx = (subs->hwptr_done + i)
1521 % (runtime->buffer_size * stride);
1522 buf[i] = bitrev8(runtime->dma_area[idx]);
1523 }
1524
1525 subs->hwptr_done += bytes;
1526 if (subs->hwptr_done >= runtime->buffer_size * stride)
1527 subs->hwptr_done -= runtime->buffer_size * stride;
1528 } else {
1529 /* usual PCM */
1530 if (!subs->tx_length_quirk)
1531 copy_to_urb(subs, urb, 0, stride, bytes);
1532 else
1533 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1534 /* bytes is now amount of outgoing data */
1535 }
1536
1537 /* update delay with exact number of samples queued */
1538 runtime->delay = subs->last_delay;
1539 runtime->delay += frames;
1540 subs->last_delay = runtime->delay;
1541
1542 /* realign last_frame_number */
1543 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1544 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1545
1546 if (subs->trigger_tstamp_pending_update) {
1547 /* this is the first actual URB submitted,
1548 * update trigger timestamp to reflect actual start time
1549 */
1550 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1551 subs->trigger_tstamp_pending_update = false;
1552 }
1553
1554 spin_unlock_irqrestore(&subs->lock, flags);
1555 urb->transfer_buffer_length = bytes;
1556 if (period_elapsed)
1557 snd_pcm_period_elapsed(subs->pcm_substream);
1558 }
1559
1560 /*
1561 * process after playback data complete
1562 * - decrease the delay count again
1563 */
1564 static void retire_playback_urb(struct snd_usb_substream *subs,
1565 struct urb *urb)
1566 {
1567 unsigned long flags;
1568 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1569 struct snd_usb_endpoint *ep = subs->data_endpoint;
1570 int processed = urb->transfer_buffer_length / ep->stride;
1571 int est_delay;
1572
1573 /* ignore the delay accounting when procssed=0 is given, i.e.
1574 * silent payloads are procssed before handling the actual data
1575 */
1576 if (!processed)
1577 return;
1578
1579 spin_lock_irqsave(&subs->lock, flags);
1580 if (!subs->last_delay)
1581 goto out; /* short path */
1582
1583 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1584 /* update delay with exact number of samples played */
1585 if (processed > subs->last_delay)
1586 subs->last_delay = 0;
1587 else
1588 subs->last_delay -= processed;
1589 runtime->delay = subs->last_delay;
1590
1591 /*
1592 * Report when delay estimate is off by more than 2ms.
1593 * The error should be lower than 2ms since the estimate relies
1594 * on two reads of a counter updated every ms.
1595 */
1596 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1597 dev_dbg_ratelimited(&subs->dev->dev,
1598 "delay: estimated %d, actual %d\n",
1599 est_delay, subs->last_delay);
1600
1601 if (!subs->running) {
1602 /* update last_frame_number for delay counting here since
1603 * prepare_playback_urb won't be called during pause
1604 */
1605 subs->last_frame_number =
1606 usb_get_current_frame_number(subs->dev) & 0xff;
1607 }
1608
1609 out:
1610 spin_unlock_irqrestore(&subs->lock, flags);
1611 }
1612
1613 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1614 {
1615 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1616 }
1617
1618 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1619 {
1620 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1621 }
1622
1623 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1624 {
1625 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1626 }
1627
1628 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1629 {
1630 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1631 }
1632
1633 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1634 int cmd)
1635 {
1636 struct snd_usb_substream *subs = substream->runtime->private_data;
1637
1638 switch (cmd) {
1639 case SNDRV_PCM_TRIGGER_START:
1640 subs->trigger_tstamp_pending_update = true;
1641 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1642 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1643 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1644 subs->running = 1;
1645 return 0;
1646 case SNDRV_PCM_TRIGGER_STOP:
1647 stop_endpoints(subs, false);
1648 subs->running = 0;
1649 return 0;
1650 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1651 subs->data_endpoint->prepare_data_urb = NULL;
1652 /* keep retire_data_urb for delay calculation */
1653 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1654 subs->running = 0;
1655 return 0;
1656 }
1657
1658 return -EINVAL;
1659 }
1660
1661 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1662 int cmd)
1663 {
1664 int err;
1665 struct snd_usb_substream *subs = substream->runtime->private_data;
1666
1667 switch (cmd) {
1668 case SNDRV_PCM_TRIGGER_START:
1669 err = start_endpoints(subs);
1670 if (err < 0)
1671 return err;
1672
1673 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1674 subs->running = 1;
1675 return 0;
1676 case SNDRV_PCM_TRIGGER_STOP:
1677 stop_endpoints(subs, false);
1678 subs->running = 0;
1679 return 0;
1680 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1681 subs->data_endpoint->retire_data_urb = NULL;
1682 subs->running = 0;
1683 return 0;
1684 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1685 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1686 subs->running = 1;
1687 return 0;
1688 }
1689
1690 return -EINVAL;
1691 }
1692
1693 static const struct snd_pcm_ops snd_usb_playback_ops = {
1694 .open = snd_usb_playback_open,
1695 .close = snd_usb_playback_close,
1696 .ioctl = snd_pcm_lib_ioctl,
1697 .hw_params = snd_usb_hw_params,
1698 .hw_free = snd_usb_hw_free,
1699 .prepare = snd_usb_pcm_prepare,
1700 .trigger = snd_usb_substream_playback_trigger,
1701 .pointer = snd_usb_pcm_pointer,
1702 .page = snd_pcm_lib_get_vmalloc_page,
1703 .mmap = snd_pcm_lib_mmap_vmalloc,
1704 };
1705
1706 static const struct snd_pcm_ops snd_usb_capture_ops = {
1707 .open = snd_usb_capture_open,
1708 .close = snd_usb_capture_close,
1709 .ioctl = snd_pcm_lib_ioctl,
1710 .hw_params = snd_usb_hw_params,
1711 .hw_free = snd_usb_hw_free,
1712 .prepare = snd_usb_pcm_prepare,
1713 .trigger = snd_usb_substream_capture_trigger,
1714 .pointer = snd_usb_pcm_pointer,
1715 .page = snd_pcm_lib_get_vmalloc_page,
1716 .mmap = snd_pcm_lib_mmap_vmalloc,
1717 };
1718
1719 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1720 {
1721 snd_pcm_set_ops(pcm, stream,
1722 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1723 &snd_usb_playback_ops : &snd_usb_capture_ops);
1724 }
CRIS linux kernel tree