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ALSA: usb-audio: void return type of snd_usb_endpoint_deactivate()
[deliverable/linux.git] / sound / usb / pcm.c
CommitLineData
e5779998
DM		 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>
9966ddaf 18#include <linux/slab.h>
44dcbbb1 19#include <linux/bitrev.h>
edcd3633 20#include <linux/ratelimit.h>
e5779998
DM		 21#include <linux/usb.h>
22#include <linux/usb/audio.h>
7e847894 23#include <linux/usb/audio-v2.h>
e5779998
DM		 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"
c731bc96 33#include "endpoint.h"
e5779998
DM		 34#include "helper.h"
35#include "pcm.h"
79f920fb 36#include "clock.h"
88a8516a 37#include "power.h"
e5779998 38
edcd3633
DM		 39#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
40#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
41
294c4fb8
PLB		 42/* return the estimated delay based on USB frame counters */
43snd_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
48779a0b
TI		 50 if (!subs->last_delay)
51 return 0; /* short path */
52
294c4fb8
PLB		 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 */
e4cc6153
PLB		 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
294c4fb8
PLB		 69 if (est_delay < 0)
70 est_delay = 0;
71 return est_delay;
72}
73
e5779998
DM		 74/*
75 * return the current pcm pointer. just based on the hwptr_done value.
76 */
77static 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;
978520b7
TI		 83 if (subs->stream->chip->shutdown)
84 return SNDRV_PCM_POS_XRUN;
e5779998
DM		 85 spin_lock(&subs->lock);
86 hwptr_done = subs->hwptr_done;
e4cc6153 87 substream->runtime->delay = snd_usb_pcm_delay(subs,
294c4fb8 88 substream->runtime->rate);
e5779998
DM		 89 spin_unlock(&subs->lock);
90 return hwptr_done / (substream->runtime->frame_bits >> 3);
91}
92
93/*
94 * find a matching audio format
95 */
61a70950 96static struct audioformat *find_format(struct snd_usb_substream *subs)
e5779998 97{
88766f04 98 struct audioformat *fp;
e5779998
DM		 99 struct audioformat *found = NULL;
100 int cur_attr = 0, attr;
101
88766f04 102 list_for_each_entry(fp, &subs->fmt_list, list) {
74c34ca1 103 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
015eb0b0 104 continue;
61a70950 105 if (fp->channels != subs->channels)
e5779998 106 continue;
61a70950
DR		 107 if (subs->cur_rate < fp->rate_min ||
108 subs->cur_rate > fp->rate_max)
e5779998
DM		 109 continue;
110 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
111 unsigned int i;
112 for (i = 0; i < fp->nr_rates; i++)
61a70950 113 if (fp->rate_table[i] == subs->cur_rate)
e5779998
DM		 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
767d75ad
DM		 153static 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 ep = get_endpoint(alts, 0)->bEndpointAddress;
163
767d75ad
DM		 164 data[0] = 1;
165 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
166 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
167 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
17d900c4 168 data, sizeof(data))) < 0) {
767d75ad
DM		 169 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
170 dev->devnum, iface, ep);
171 return err;
172 }
173
174 return 0;
175}
e5779998 176
92c25611
DM		 177static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
178 struct usb_host_interface *alts,
179 struct audioformat *fmt)
180{
181 struct usb_device *dev = chip->dev;
182 unsigned char data[1];
92c25611
DM		 183 int err;
184
92c25611
DM		 185 data[0] = 1;
186 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
187 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
188 UAC2_EP_CS_PITCH << 8, 0,
17d900c4 189 data, sizeof(data))) < 0) {
92c25611
DM		 190 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
191 dev->devnum, iface, fmt->altsetting);
192 return err;
193 }
194
195 return 0;
196}
197
e5779998 198/*
92c25611 199 * initialize the pitch control and sample rate
e5779998 200 */
767d75ad 201int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
e5779998
DM		 202 struct usb_host_interface *alts,
203 struct audioformat *fmt)
204{
92c25611
DM		 205 /* if endpoint doesn't have pitch control, bail out */
206 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
207 return 0;
208
8f898e92 209 switch (fmt->protocol) {
767d75ad 210 case UAC_VERSION_1:
a2acad82 211 default:
767d75ad
DM		 212 return init_pitch_v1(chip, iface, alts, fmt);
213
214 case UAC_VERSION_2:
92c25611 215 return init_pitch_v2(chip, iface, alts, fmt);
767d75ad 216 }
767d75ad
DM		 217}
218
a9bb3626 219static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
edcd3633
DM		 220{
221 int err;
222
223 if (!subs->data_endpoint)
224 return -EINVAL;
225
226 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
227 struct snd_usb_endpoint *ep = subs->data_endpoint;
228
229 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
230
231 ep->data_subs = subs;
015618b9 232 err = snd_usb_endpoint_start(ep, can_sleep);
edcd3633
DM		 233 if (err < 0) {
234 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
235 return err;
236 }
237 }
238
239 if (subs->sync_endpoint &&
240 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
241 struct snd_usb_endpoint *ep = subs->sync_endpoint;
242
2e4a263c
DM		 243 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
244 subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
245 err = usb_set_interface(subs->dev,
246 subs->sync_endpoint->iface,
247 subs->sync_endpoint->alt_idx);
248 if (err < 0) {
249 snd_printk(KERN_ERR
250 "%d:%d:%d: cannot set interface (%d)\n",
251 subs->dev->devnum,
252 subs->sync_endpoint->iface,
253 subs->sync_endpoint->alt_idx, err);
254 return -EIO;
255 }
256 }
257
edcd3633
DM		 258 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
259
260 ep->sync_slave = subs->data_endpoint;
015618b9 261 err = snd_usb_endpoint_start(ep, can_sleep);
edcd3633
DM		 262 if (err < 0) {
263 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
264 return err;
265 }
266 }
267
268 return 0;
269}
270
a9bb3626 271static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
edcd3633
DM		 272{
273 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
b2eb950d 274 snd_usb_endpoint_stop(subs->sync_endpoint);
edcd3633
DM		 275
276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
b2eb950d
TI		 277 snd_usb_endpoint_stop(subs->data_endpoint);
278
279 if (wait) {
280 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
281 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
282 }
edcd3633
DM		 283}
284
ba7c2be1
CL		 285static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
286 unsigned int altsetting,
287 struct usb_host_interface **alts,
288 unsigned int *ep)
289{
290 struct usb_interface *iface;
291 struct usb_interface_descriptor *altsd;
292 struct usb_endpoint_descriptor *epd;
293
294 iface = usb_ifnum_to_if(dev, ifnum);
295 if (!iface || iface->num_altsetting < altsetting + 1)
296 return -ENOENT;
297 *alts = &iface->altsetting[altsetting];
298 altsd = get_iface_desc(*alts);
299 if (altsd->bAlternateSetting != altsetting ||
300 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
301 (altsd->bInterfaceSubClass != 2 &&
302 altsd->bInterfaceProtocol != 2 ) ||
303 altsd->bNumEndpoints < 1)
304 return -ENOENT;
305 epd = get_endpoint(*alts, 0);
306 if (!usb_endpoint_is_isoc_in(epd) ||
307 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
308 USB_ENDPOINT_USAGE_IMPLICIT_FB)
309 return -ENOENT;
310 *ep = epd->bEndpointAddress;
311 return 0;
312}
313
a60945fd
EZ		 314static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
315 struct usb_device *dev,
316 struct usb_interface_descriptor *altsd,
317 unsigned int attr)
e5779998 318{
a60945fd 319 struct usb_host_interface *alts;
e5779998 320 struct usb_interface *iface;
a60945fd 321 unsigned int ep;
c75a8a7a 322
914273c7
EZ		 323 /* Implicit feedback sync EPs consumers are always playback EPs */
324 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
325 return 0;
326
c75a8a7a 327 switch (subs->stream->chip->usb_id) {
ca10a7eb 328 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
e9a25e04 329 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
914273c7
EZ		 330 ep = 0x81;
331 iface = usb_ifnum_to_if(dev, 3);
ca10a7eb 332
914273c7
EZ		 333 if (!iface || iface->num_altsetting == 0)
334 return -EINVAL;
ca10a7eb 335
914273c7
EZ		 336 alts = &iface->altsetting[1];
337 goto add_sync_ep;
ca10a7eb 338 break;
c75a8a7a
DM		 339 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
340 case USB_ID(0x0763, 0x2081):
914273c7
EZ		 341 ep = 0x81;
342 iface = usb_ifnum_to_if(dev, 2);
c75a8a7a 343
914273c7
EZ		 344 if (!iface || iface->num_altsetting == 0)
345 return -EINVAL;
c75a8a7a 346
914273c7
EZ		 347 alts = &iface->altsetting[1];
348 goto add_sync_ep;
c75a8a7a 349 }
914273c7 350 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
ba7c2be1
CL		 351 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
352 altsd->bInterfaceProtocol == 2 &&
353 altsd->bNumEndpoints == 1 &&
354 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
355 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
356 altsd->bAlternateSetting,
357 &alts, &ep) >= 0) {
ba7c2be1
CL		 358 goto add_sync_ep;
359 }
edcd3633 360
a60945fd
EZ		 361 /* No quirk */
362 return 0;
363
364add_sync_ep:
365 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
366 alts, ep, !subs->direction,
88abb8ef 367 SND_USB_ENDPOINT_TYPE_DATA);
a60945fd
EZ		 368 if (!subs->sync_endpoint)
369 return -EINVAL;
370
371 subs->data_endpoint->sync_master = subs->sync_endpoint;
372
373 return 0;
374}
375
376static int set_sync_endpoint(struct snd_usb_substream *subs,
377 struct audioformat *fmt,
378 struct usb_device *dev,
379 struct usb_host_interface *alts,
380 struct usb_interface_descriptor *altsd)
381{
382 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
383 unsigned int ep, attr;
95fec883 384 bool implicit_fb;
a60945fd
EZ		 385 int err;
386
387 /* we need a sync pipe in async OUT or adaptive IN mode */
388 /* check the number of EP, since some devices have broken
389 * descriptors which fool us. if it has only one EP,
390 * assume it as adaptive-out or sync-in.
391 */
392 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
393
394 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
395 if (err < 0)
396 return err;
397
f34d0650
EZ		 398 if (altsd->bNumEndpoints < 2)
399 return 0;
c75a8a7a 400
f34d0650
EZ		 401 if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) ||
402 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
403 return 0;
edcd3633 404
f34d0650
EZ		 405 /* check sync-pipe endpoint */
406 /* ... and check descriptor size before accessing bSynchAddress
407 because there is a version of the SB Audigy 2 NX firmware lacking
408 the audio fields in the endpoint descriptors */
409 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
410 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
95fec883 411 get_endpoint(alts, 1)->bSynchAddress != 0)) {
f34d0650
EZ		 412 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
413 dev->devnum, fmt->iface, fmt->altsetting,
414 get_endpoint(alts, 1)->bmAttributes,
415 get_endpoint(alts, 1)->bLength,
416 get_endpoint(alts, 1)->bSynchAddress);
417 return -EINVAL;
418 }
419 ep = get_endpoint(alts, 1)->bEndpointAddress;
95fec883 420 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
f34d0650
EZ		 421 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
422 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
423 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
424 dev->devnum, fmt->iface, fmt->altsetting,
425 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
426 return -EINVAL;
edcd3633 427 }
e5779998 428
f34d0650
EZ		 429 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
430 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
431
432 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
433 alts, ep, !subs->direction,
434 implicit_fb ?
435 SND_USB_ENDPOINT_TYPE_DATA :
436 SND_USB_ENDPOINT_TYPE_SYNC);
437 if (!subs->sync_endpoint)
438 return -EINVAL;
439
440 subs->data_endpoint->sync_master = subs->sync_endpoint;
441
71bb64c5
EZ		 442 return 0;
443}
444
445/*
446 * find a matching format and set up the interface
447 */
448static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
449{
450 struct usb_device *dev = subs->dev;
451 struct usb_host_interface *alts;
452 struct usb_interface_descriptor *altsd;
453 struct usb_interface *iface;
454 int err;
455
456 iface = usb_ifnum_to_if(dev, fmt->iface);
457 if (WARN_ON(!iface))
458 return -EINVAL;
459 alts = &iface->altsetting[fmt->altset_idx];
460 altsd = get_iface_desc(alts);
461 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
462 return -EINVAL;
463
464 if (fmt == subs->cur_audiofmt)
465 return 0;
466
467 /* close the old interface */
468 if (subs->interface >= 0 && subs->interface != fmt->iface) {
469 err = usb_set_interface(subs->dev, subs->interface, 0);
470 if (err < 0) {
471 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
472 dev->devnum, fmt->iface, fmt->altsetting, err);
473 return -EIO;
474 }
475 subs->interface = -1;
476 subs->altset_idx = 0;
477 }
478
479 /* set interface */
480 if (subs->interface != fmt->iface ||
481 subs->altset_idx != fmt->altset_idx) {
482 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
483 if (err < 0) {
484 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
485 dev->devnum, fmt->iface, fmt->altsetting, err);
486 return -EIO;
487 }
488 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
489 fmt->iface, fmt->altsetting);
490 subs->interface = fmt->iface;
491 subs->altset_idx = fmt->altset_idx;
492
493 snd_usb_set_interface_quirk(dev);
494 }
495
496 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
497 alts, fmt->endpoint, subs->direction,
498 SND_USB_ENDPOINT_TYPE_DATA);
499
500 if (!subs->data_endpoint)
501 return -EINVAL;
502
503 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
504 if (err < 0)
505 return err;
506
d133f2c2
EZ		 507 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
508 if (err < 0)
e5779998
DM		 509 return err;
510
511 subs->cur_audiofmt = fmt;
512
513 snd_usb_set_format_quirk(subs, fmt);
514
e5779998
DM		 515 return 0;
516}
517
0d9741c0
EZ		 518/*
519 * Return the score of matching two audioformats.
520 * Veto the audioformat if:
521 * - It has no channels for some reason.
522 * - Requested PCM format is not supported.
523 * - Requested sample rate is not supported.
524 */
525static int match_endpoint_audioformats(struct audioformat *fp,
526 struct audioformat *match, int rate,
527 snd_pcm_format_t pcm_format)
528{
529 int i;
530 int score = 0;
531
532 if (fp->channels < 1) {
533 snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
534 return 0;
535 }
536
74c34ca1 537 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
0d9741c0
EZ		 538 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
539 fp, pcm_format);
540 return 0;
541 }
542
543 for (i = 0; i < fp->nr_rates; i++) {
544 if (fp->rate_table[i] == rate) {
545 score++;
546 break;
547 }
548 }
549 if (!score) {
550 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
551 fp, rate);
552 return 0;
553 }
554
555 if (fp->channels == match->channels)
556 score++;
557
558 snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);
559
560 return score;
561}
562
563/*
564 * Configure the sync ep using the rate and pcm format of the data ep.
565 */
566static int configure_sync_endpoint(struct snd_usb_substream *subs)
567{
568 int ret;
569 struct audioformat *fp;
570 struct audioformat *sync_fp = NULL;
571 int cur_score = 0;
572 int sync_period_bytes = subs->period_bytes;
573 struct snd_usb_substream *sync_subs =
574 &subs->stream->substream[subs->direction ^ 1];
575
31be5425
TI		 576 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
577 !subs->stream)
578 return snd_usb_endpoint_set_params(subs->sync_endpoint,
579 subs->pcm_format,
580 subs->channels,
581 subs->period_bytes,
976b6c06 582 0, 0,
31be5425
TI		 583 subs->cur_rate,
584 subs->cur_audiofmt,
585 NULL);
586
0d9741c0
EZ		 587 /* Try to find the best matching audioformat. */
588 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
589 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
590 subs->cur_rate, subs->pcm_format);
591
592 if (score > cur_score) {
593 sync_fp = fp;
594 cur_score = score;
595 }
596 }
597
598 if (unlikely(sync_fp == NULL)) {
599 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
600 __func__, sync_subs->ep_num);
601 return -EINVAL;
602 }
603
604 /*
605 * Recalculate the period bytes if channel number differ between
606 * data and sync ep audioformat.
607 */
608 if (sync_fp->channels != subs->channels) {
609 sync_period_bytes = (subs->period_bytes / subs->channels) *
610 sync_fp->channels;
611 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
612 __func__, subs->period_bytes, sync_period_bytes);
613 }
614
615 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
616 subs->pcm_format,
617 sync_fp->channels,
618 sync_period_bytes,
976b6c06 619 0, 0,
0d9741c0
EZ		 620 subs->cur_rate,
621 sync_fp,
622 NULL);
623
624 return ret;
625}
626
61a70950
DR		 627/*
628 * configure endpoint params
629 *
630 * called during initial setup and upon resume
631 */
632static int configure_endpoint(struct snd_usb_substream *subs)
633{
634 int ret;
635
61a70950 636 /* format changed */
b0db6063 637 stop_endpoints(subs, true);
61a70950
DR		 638 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
639 subs->pcm_format,
640 subs->channels,
641 subs->period_bytes,
976b6c06
AS		 642 subs->period_frames,
643 subs->buffer_periods,
61a70950
DR		 644 subs->cur_rate,
645 subs->cur_audiofmt,
646 subs->sync_endpoint);
647 if (ret < 0)
978520b7 648 return ret;
61a70950
DR		 649
650 if (subs->sync_endpoint)
0d9741c0
EZ		 651 ret = configure_sync_endpoint(subs);
652
61a70950
DR		 653 return ret;
654}
655
e5779998
DM		 656/*
657 * hw_params callback
658 *
659 * allocate a buffer and set the given audio format.
660 *
661 * so far we use a physically linear buffer although packetize transfer
662 * doesn't need a continuous area.
663 * if sg buffer is supported on the later version of alsa, we'll follow
664 * that.
665 */
666static int snd_usb_hw_params(struct snd_pcm_substream *substream,
667 struct snd_pcm_hw_params *hw_params)
668{
669 struct snd_usb_substream *subs = substream->runtime->private_data;
670 struct audioformat *fmt;
61a70950 671 int ret;
e5779998
DM		 672
673 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
674 params_buffer_bytes(hw_params));
675 if (ret < 0)
676 return ret;
677
61a70950
DR		 678 subs->pcm_format = params_format(hw_params);
679 subs->period_bytes = params_period_bytes(hw_params);
976b6c06
AS		 680 subs->period_frames = params_period_size(hw_params);
681 subs->buffer_periods = params_periods(hw_params);
61a70950
DR		 682 subs->channels = params_channels(hw_params);
683 subs->cur_rate = params_rate(hw_params);
684
685 fmt = find_format(subs);
e5779998
DM		 686 if (!fmt) {
687 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
61a70950 688 subs->pcm_format, subs->cur_rate, subs->channels);
e5779998
DM		 689 return -EINVAL;
690 }
691
34f3c89f 692 down_read(&subs->stream->chip->shutdown_rwsem);
978520b7
TI		 693 if (subs->stream->chip->shutdown)
694 ret = -ENODEV;
695 else
696 ret = set_format(subs, fmt);
34f3c89f 697 up_read(&subs->stream->chip->shutdown_rwsem);
978520b7 698 if (ret < 0)
e5779998
DM		 699 return ret;
700
61a70950
DR		 701 subs->interface = fmt->iface;
702 subs->altset_idx = fmt->altset_idx;
384dc085 703 subs->need_setup_ep = true;
715a1705 704
61a70950 705 return 0;
e5779998
DM		 706}
707
708/*
709 * hw_free callback
710 *
711 * reset the audio format and release the buffer
712 */
713static int snd_usb_hw_free(struct snd_pcm_substream *substream)
714{
715 struct snd_usb_substream *subs = substream->runtime->private_data;
716
717 subs->cur_audiofmt = NULL;
718 subs->cur_rate = 0;
719 subs->period_bytes = 0;
34f3c89f 720 down_read(&subs->stream->chip->shutdown_rwsem);
978520b7 721 if (!subs->stream->chip->shutdown) {
a9bb3626 722 stop_endpoints(subs, true);
26de5d0a
EZ		 723 snd_usb_endpoint_deactivate(subs->sync_endpoint);
724 snd_usb_endpoint_deactivate(subs->data_endpoint);
978520b7 725 }
34f3c89f 726 up_read(&subs->stream->chip->shutdown_rwsem);
e5779998
DM		 727 return snd_pcm_lib_free_vmalloc_buffer(substream);
728}
729
730/*
731 * prepare callback
732 *
733 * only a few subtle things...
734 */
735static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
736{
737 struct snd_pcm_runtime *runtime = substream->runtime;
738 struct snd_usb_substream *subs = runtime->private_data;
61a70950
DR		 739 struct usb_host_interface *alts;
740 struct usb_interface *iface;
741 int ret;
e5779998
DM		 742
743 if (! subs->cur_audiofmt) {
744 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
745 return -ENXIO;
746 }
747
34f3c89f 748 down_read(&subs->stream->chip->shutdown_rwsem);
978520b7
TI		 749 if (subs->stream->chip->shutdown) {
750 ret = -ENODEV;
751 goto unlock;
752 }
753 if (snd_BUG_ON(!subs->data_endpoint)) {
754 ret = -EIO;
755 goto unlock;
756 }
edcd3633 757
f58161ba
TI		 758 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
759 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
760
61a70950
DR		 761 ret = set_format(subs, subs->cur_audiofmt);
762 if (ret < 0)
978520b7 763 goto unlock;
61a70950
DR		 764
765 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
766 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
767 ret = snd_usb_init_sample_rate(subs->stream->chip,
768 subs->cur_audiofmt->iface,
769 alts,
770 subs->cur_audiofmt,
771 subs->cur_rate);
772 if (ret < 0)
978520b7 773 goto unlock;
61a70950 774
384dc085
TI		 775 if (subs->need_setup_ep) {
776 ret = configure_endpoint(subs);
777 if (ret < 0)
978520b7 778 goto unlock;
384dc085
TI		 779 subs->need_setup_ep = false;
780 }
61a70950 781
e5779998 782 /* some unit conversions in runtime */
edcd3633
DM		 783 subs->data_endpoint->maxframesize =
784 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
785 subs->data_endpoint->curframesize =
786 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
e5779998
DM		 787
788 /* reset the pointer */
789 subs->hwptr_done = 0;
790 subs->transfer_done = 0;
294c4fb8
PLB		 791 subs->last_delay = 0;
792 subs->last_frame_number = 0;
e5779998
DM		 793 runtime->delay = 0;
794
edcd3633
DM		 795 /* for playback, submit the URBs now; otherwise, the first hwptr_done
796 * updates for all URBs would happen at the same time when starting */
797 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
a9bb3626 798 ret = start_endpoints(subs, true);
edcd3633 799
978520b7 800 unlock:
34f3c89f 801 up_read(&subs->stream->chip->shutdown_rwsem);
978520b7 802 return ret;
e5779998
DM		 803}
804
805static struct snd_pcm_hardware snd_usb_hardware =
806{
807 .info = SNDRV_PCM_INFO_MMAP |
808 SNDRV_PCM_INFO_MMAP_VALID |
809 SNDRV_PCM_INFO_BATCH |
810 SNDRV_PCM_INFO_INTERLEAVED |
811 SNDRV_PCM_INFO_BLOCK_TRANSFER |
812 SNDRV_PCM_INFO_PAUSE,
813 .buffer_bytes_max = 1024 * 1024,
814 .period_bytes_min = 64,
815 .period_bytes_max = 512 * 1024,
816 .periods_min = 2,
817 .periods_max = 1024,
818};
819
820static int hw_check_valid_format(struct snd_usb_substream *subs,
821 struct snd_pcm_hw_params *params,
822 struct audioformat *fp)
823{
824 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
825 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
826 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
827 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
015eb0b0 828 struct snd_mask check_fmts;
e5779998
DM		 829 unsigned int ptime;
830
831 /* check the format */
015eb0b0
CL		 832 snd_mask_none(&check_fmts);
833 check_fmts.bits[0] = (u32)fp->formats;
834 check_fmts.bits[1] = (u32)(fp->formats >> 32);
835 snd_mask_intersect(&check_fmts, fmts);
836 if (snd_mask_empty(&check_fmts)) {
e5779998
DM		 837 hwc_debug(" > check: no supported format %d\n", fp->format);
838 return 0;
839 }
840 /* check the channels */
841 if (fp->channels < ct->min || fp->channels > ct->max) {
842 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
843 return 0;
844 }
845 /* check the rate is within the range */
846 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
847 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
848 return 0;
849 }
850 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
851 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
852 return 0;
853 }
854 /* check whether the period time is >= the data packet interval */
978520b7 855 if (subs->speed != USB_SPEED_FULL) {
e5779998
DM		 856 ptime = 125 * (1 << fp->datainterval);
857 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
858 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
859 return 0;
860 }
861 }
862 return 1;
863}
864
865static int hw_rule_rate(struct snd_pcm_hw_params *params,
866 struct snd_pcm_hw_rule *rule)
867{
868 struct snd_usb_substream *subs = rule->private;
88766f04 869 struct audioformat *fp;
e5779998
DM		 870 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
871 unsigned int rmin, rmax;
872 int changed;
873
874 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
875 changed = 0;
876 rmin = rmax = 0;
88766f04 877 list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998
DM		 878 if (!hw_check_valid_format(subs, params, fp))
879 continue;
880 if (changed++) {
881 if (rmin > fp->rate_min)
882 rmin = fp->rate_min;
883 if (rmax < fp->rate_max)
884 rmax = fp->rate_max;
885 } else {
886 rmin = fp->rate_min;
887 rmax = fp->rate_max;
888 }
889 }
890
891 if (!changed) {
892 hwc_debug(" --> get empty\n");
893 it->empty = 1;
894 return -EINVAL;
895 }
896
897 changed = 0;
898 if (it->min < rmin) {
899 it->min = rmin;
900 it->openmin = 0;
901 changed = 1;
902 }
903 if (it->max > rmax) {
904 it->max = rmax;
905 it->openmax = 0;
906 changed = 1;
907 }
908 if (snd_interval_checkempty(it)) {
909 it->empty = 1;
910 return -EINVAL;
911 }
912 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
913 return changed;
914}
915
916
917static int hw_rule_channels(struct snd_pcm_hw_params *params,
918 struct snd_pcm_hw_rule *rule)
919{
920 struct snd_usb_substream *subs = rule->private;
88766f04 921 struct audioformat *fp;
e5779998
DM		 922 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
923 unsigned int rmin, rmax;
924 int changed;
925
926 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
927 changed = 0;
928 rmin = rmax = 0;
88766f04 929 list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998
DM		 930 if (!hw_check_valid_format(subs, params, fp))
931 continue;
932 if (changed++) {
933 if (rmin > fp->channels)
934 rmin = fp->channels;
935 if (rmax < fp->channels)
936 rmax = fp->channels;
937 } else {
938 rmin = fp->channels;
939 rmax = fp->channels;
940 }
941 }
942
943 if (!changed) {
944 hwc_debug(" --> get empty\n");
945 it->empty = 1;
946 return -EINVAL;
947 }
948
949 changed = 0;
950 if (it->min < rmin) {
951 it->min = rmin;
952 it->openmin = 0;
953 changed = 1;
954 }
955 if (it->max > rmax) {
956 it->max = rmax;
957 it->openmax = 0;
958 changed = 1;
959 }
960 if (snd_interval_checkempty(it)) {
961 it->empty = 1;
962 return -EINVAL;
963 }
964 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
965 return changed;
966}
967
968static int hw_rule_format(struct snd_pcm_hw_params *params,
969 struct snd_pcm_hw_rule *rule)
970{
971 struct snd_usb_substream *subs = rule->private;
88766f04 972 struct audioformat *fp;
e5779998
DM		 973 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
974 u64 fbits;
975 u32 oldbits[2];
976 int changed;
977
978 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
979 fbits = 0;
88766f04 980 list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998
DM		 981 if (!hw_check_valid_format(subs, params, fp))
982 continue;
015eb0b0 983 fbits |= fp->formats;
e5779998
DM		 984 }
985
986 oldbits[0] = fmt->bits[0];
987 oldbits[1] = fmt->bits[1];
988 fmt->bits[0] &= (u32)fbits;
989 fmt->bits[1] &= (u32)(fbits >> 32);
990 if (!fmt->bits[0] && !fmt->bits[1]) {
991 hwc_debug(" --> get empty\n");
992 return -EINVAL;
993 }
994 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
995 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
996 return changed;
997}
998
999static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1000 struct snd_pcm_hw_rule *rule)
1001{
1002 struct snd_usb_substream *subs = rule->private;
1003 struct audioformat *fp;
1004 struct snd_interval *it;
1005 unsigned char min_datainterval;
1006 unsigned int pmin;
1007 int changed;
1008
1009 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1010 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1011 min_datainterval = 0xff;
1012 list_for_each_entry(fp, &subs->fmt_list, list) {
1013 if (!hw_check_valid_format(subs, params, fp))
1014 continue;
1015 min_datainterval = min(min_datainterval, fp->datainterval);
1016 }
1017 if (min_datainterval == 0xff) {
a7ce2e0d 1018 hwc_debug(" --> get empty\n");
e5779998
DM		 1019 it->empty = 1;
1020 return -EINVAL;
1021 }
1022 pmin = 125 * (1 << min_datainterval);
1023 changed = 0;
1024 if (it->min < pmin) {
1025 it->min = pmin;
1026 it->openmin = 0;
1027 changed = 1;
1028 }
1029 if (snd_interval_checkempty(it)) {
1030 it->empty = 1;
1031 return -EINVAL;
1032 }
1033 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1034 return changed;
1035}
1036
1037/*
1038 * If the device supports unusual bit rates, does the request meet these?
1039 */
1040static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1041 struct snd_usb_substream *subs)
1042{
1043 struct audioformat *fp;
0717d0f5 1044 int *rate_list;
e5779998
DM		 1045 int count = 0, needs_knot = 0;
1046 int err;
1047
5cd5d7c4
CL		 1048 kfree(subs->rate_list.list);
1049 subs->rate_list.list = NULL;
1050
e5779998
DM		 1051 list_for_each_entry(fp, &subs->fmt_list, list) {
1052 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1053 return 0;
1054 count += fp->nr_rates;
1055 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1056 needs_knot = 1;
1057 }
1058 if (!needs_knot)
1059 return 0;
1060
0717d0f5
TI		 1061 subs->rate_list.list = rate_list =
1062 kmalloc(sizeof(int) * count, GFP_KERNEL);
8a8d56b2
JJ		 1063 if (!subs->rate_list.list)
1064 return -ENOMEM;
1065 subs->rate_list.count = count;
e5779998
DM		 1066 subs->rate_list.mask = 0;
1067 count = 0;
1068 list_for_each_entry(fp, &subs->fmt_list, list) {
1069 int i;
1070 for (i = 0; i < fp->nr_rates; i++)
0717d0f5 1071 rate_list[count++] = fp->rate_table[i];
e5779998
DM		 1072 }
1073 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1074 &subs->rate_list);
1075 if (err < 0)
1076 return err;
1077
1078 return 0;
1079}
1080
1081
1082/*
1083 * set up the runtime hardware information.
1084 */
1085
1086static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1087{
88766f04 1088 struct audioformat *fp;
e5779998
DM		 1089 unsigned int pt, ptmin;
1090 int param_period_time_if_needed;
1091 int err;
1092
1093 runtime->hw.formats = subs->formats;
1094
1095 runtime->hw.rate_min = 0x7fffffff;
1096 runtime->hw.rate_max = 0;
1097 runtime->hw.channels_min = 256;
1098 runtime->hw.channels_max = 0;
1099 runtime->hw.rates = 0;
1100 ptmin = UINT_MAX;
1101 /* check min/max rates and channels */
88766f04 1102 list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998
DM		 1103 runtime->hw.rates |= fp->rates;
1104 if (runtime->hw.rate_min > fp->rate_min)
1105 runtime->hw.rate_min = fp->rate_min;
1106 if (runtime->hw.rate_max < fp->rate_max)
1107 runtime->hw.rate_max = fp->rate_max;
1108 if (runtime->hw.channels_min > fp->channels)
1109 runtime->hw.channels_min = fp->channels;
1110 if (runtime->hw.channels_max < fp->channels)
1111 runtime->hw.channels_max = fp->channels;
1112 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1113 /* FIXME: there might be more than one audio formats... */
1114 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1115 fp->frame_size;
1116 }
1117 pt = 125 * (1 << fp->datainterval);
1118 ptmin = min(ptmin, pt);
1119 }
88a8516a
ON		 1120 err = snd_usb_autoresume(subs->stream->chip);
1121 if (err < 0)
1122 return err;
e5779998
DM		 1123
1124 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
978520b7 1125 if (subs->speed == USB_SPEED_FULL)
e5779998
DM		 1126 /* full speed devices have fixed data packet interval */
1127 ptmin = 1000;
1128 if (ptmin == 1000)
1129 /* if period time doesn't go below 1 ms, no rules needed */
1130 param_period_time_if_needed = -1;
1131 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1132 ptmin, UINT_MAX);
1133
1134 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1135 hw_rule_rate, subs,
1136 SNDRV_PCM_HW_PARAM_FORMAT,
1137 SNDRV_PCM_HW_PARAM_CHANNELS,
1138 param_period_time_if_needed,
1139 -1)) < 0)
88a8516a 1140 goto rep_err;
e5779998
DM		 1141 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1142 hw_rule_channels, subs,
1143 SNDRV_PCM_HW_PARAM_FORMAT,
1144 SNDRV_PCM_HW_PARAM_RATE,
1145 param_period_time_if_needed,
1146 -1)) < 0)
88a8516a 1147 goto rep_err;
e5779998
DM		 1148 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1149 hw_rule_format, subs,
1150 SNDRV_PCM_HW_PARAM_RATE,
1151 SNDRV_PCM_HW_PARAM_CHANNELS,
1152 param_period_time_if_needed,
1153 -1)) < 0)
88a8516a 1154 goto rep_err;
e5779998
DM		 1155 if (param_period_time_if_needed >= 0) {
1156 err = snd_pcm_hw_rule_add(runtime, 0,
1157 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1158 hw_rule_period_time, subs,
1159 SNDRV_PCM_HW_PARAM_FORMAT,
1160 SNDRV_PCM_HW_PARAM_CHANNELS,
1161 SNDRV_PCM_HW_PARAM_RATE,
1162 -1);
1163 if (err < 0)
88a8516a 1164 goto rep_err;
e5779998
DM		 1165 }
1166 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
88a8516a 1167 goto rep_err;
e5779998 1168 return 0;
88a8516a
ON		 1169
1170rep_err:
1171 snd_usb_autosuspend(subs->stream->chip);
1172 return err;
e5779998
DM		 1173}
1174
1175static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1176{
1177 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1178 struct snd_pcm_runtime *runtime = substream->runtime;
1179 struct snd_usb_substream *subs = &as->substream[direction];
1180
1181 subs->interface = -1;
e11b4e0e 1182 subs->altset_idx = 0;
e5779998
DM		 1183 runtime->hw = snd_usb_hardware;
1184 runtime->private_data = subs;
1185 subs->pcm_substream = substream;
88a8516a 1186 /* runtime PM is also done there */
d24f5061
DM		 1187
1188 /* initialize DSD/DOP context */
1189 subs->dsd_dop.byte_idx = 0;
1190 subs->dsd_dop.channel = 0;
1191 subs->dsd_dop.marker = 1;
1192
e5779998
DM		 1193 return setup_hw_info(runtime, subs);
1194}
1195
1196static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1197{
1198 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1199 struct snd_usb_substream *subs = &as->substream[direction];
1200
b0db6063 1201 stop_endpoints(subs, true);
68e67f40
DM		 1202
1203 if (!as->chip->shutdown && subs->interface >= 0) {
1204 usb_set_interface(subs->dev, subs->interface, 0);
1205 subs->interface = -1;
1206 }
1207
e5779998 1208 subs->pcm_substream = NULL;
88a8516a 1209 snd_usb_autosuspend(subs->stream->chip);
edcd3633 1210
68e67f40 1211 return 0;
edcd3633
DM		 1212}
1213
1214/* Since a URB can handle only a single linear buffer, we must use double
1215 * buffering when the data to be transferred overflows the buffer boundary.
1216 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1217 * for all URBs.
1218 */
1219static void retire_capture_urb(struct snd_usb_substream *subs,
1220 struct urb *urb)
1221{
1222 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1223 unsigned int stride, frames, bytes, oldptr;
1224 int i, period_elapsed = 0;
1225 unsigned long flags;
1226 unsigned char *cp;
e4cc6153
PLB		 1227 int current_frame_number;
1228
1229 /* read frame number here, update pointer in critical section */
1230 current_frame_number = usb_get_current_frame_number(subs->dev);
edcd3633
DM		 1231
1232 stride = runtime->frame_bits >> 3;
1233
1234 for (i = 0; i < urb->number_of_packets; i++) {
1539d4f8 1235 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
edcd3633
DM		 1236 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1237 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1238 // continue;
1239 }
1240 bytes = urb->iso_frame_desc[i].actual_length;
1241 frames = bytes / stride;
1242 if (!subs->txfr_quirk)
1243 bytes = frames * stride;
1244 if (bytes % (runtime->sample_bits >> 3) != 0) {
edcd3633 1245 int oldbytes = bytes;
edcd3633
DM		 1246 bytes = frames * stride;
1247 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1248 oldbytes, bytes);
1249 }
1250 /* update the current pointer */
1251 spin_lock_irqsave(&subs->lock, flags);
1252 oldptr = subs->hwptr_done;
1253 subs->hwptr_done += bytes;
1254 if (subs->hwptr_done >= runtime->buffer_size * stride)
1255 subs->hwptr_done -= runtime->buffer_size * stride;
1256 frames = (bytes + (oldptr % stride)) / stride;
1257 subs->transfer_done += frames;
1258 if (subs->transfer_done >= runtime->period_size) {
1259 subs->transfer_done -= runtime->period_size;
1260 period_elapsed = 1;
1261 }
e4cc6153
PLB		 1262 /* capture delay is by construction limited to one URB,
1263 * reset delays here
1264 */
1265 runtime->delay = subs->last_delay = 0;
1266
1267 /* realign last_frame_number */
1268 subs->last_frame_number = current_frame_number;
1269 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1270
edcd3633
DM		 1271 spin_unlock_irqrestore(&subs->lock, flags);
1272 /* copy a data chunk */
1273 if (oldptr + bytes > runtime->buffer_size * stride) {
1274 unsigned int bytes1 =
1275 runtime->buffer_size * stride - oldptr;
1276 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1277 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1278 } else {
1279 memcpy(runtime->dma_area + oldptr, cp, bytes);
1280 }
1281 }
1282
1283 if (period_elapsed)
1284 snd_pcm_period_elapsed(subs->pcm_substream);
1285}
1286
d24f5061
DM		 1287static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1288 struct urb *urb, unsigned int bytes)
1289{
1290 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1291 unsigned int stride = runtime->frame_bits >> 3;
1292 unsigned int dst_idx = 0;
1293 unsigned int src_idx = subs->hwptr_done;
1294 unsigned int wrap = runtime->buffer_size * stride;
1295 u8 *dst = urb->transfer_buffer;
1296 u8 *src = runtime->dma_area;
1297 u8 marker[] = { 0x05, 0xfa };
1298
1299 /*
1300 * The DSP DOP format defines a way to transport DSD samples over
1301 * normal PCM data endpoints. It requires stuffing of marker bytes
1302 * (0x05 and 0xfa, alternating per sample frame), and then expects
1303 * 2 additional bytes of actual payload. The whole frame is stored
1304 * LSB.
1305 *
1306 * Hence, for a stereo transport, the buffer layout looks like this,
1307 * where L refers to left channel samples and R to right.
1308 *
1309 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1310 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1311 * .....
1312 *
1313 */
1314
1315 while (bytes--) {
1316 if (++subs->dsd_dop.byte_idx == 3) {
1317 /* frame boundary? */
1318 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1319 src_idx += 2;
1320 subs->dsd_dop.byte_idx = 0;
1321
1322 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1323 /* alternate the marker */
1324 subs->dsd_dop.marker++;
1325 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1326 subs->dsd_dop.channel = 0;
1327 }
1328 } else {
1329 /* stuff the DSD payload */
1330 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
44dcbbb1
DM		 1331
1332 if (subs->cur_audiofmt->dsd_bitrev)
1333 dst[dst_idx++] = bitrev8(src[idx]);
1334 else
1335 dst[dst_idx++] = src[idx];
1336
d24f5061
DM		 1337 subs->hwptr_done++;
1338 }
1339 }
1340}
1341
edcd3633
DM		 1342static void prepare_playback_urb(struct snd_usb_substream *subs,
1343 struct urb *urb)
1344{
1345 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
245baf98 1346 struct snd_usb_endpoint *ep = subs->data_endpoint;
edcd3633
DM		 1347 struct snd_urb_ctx *ctx = urb->context;
1348 unsigned int counts, frames, bytes;
1349 int i, stride, period_elapsed = 0;
1350 unsigned long flags;
1351
1352 stride = runtime->frame_bits >> 3;
1353
1354 frames = 0;
1355 urb->number_of_packets = 0;
1356 spin_lock_irqsave(&subs->lock, flags);
976b6c06 1357 subs->frame_limit += ep->max_urb_frames;
edcd3633 1358 for (i = 0; i < ctx->packets; i++) {
245baf98
DM		 1359 if (ctx->packet_size[i])
1360 counts = ctx->packet_size[i];
1361 else
1362 counts = snd_usb_endpoint_next_packet_size(ep);
1363
edcd3633 1364 /* set up descriptor */
8a2a74d2
DM		 1365 urb->iso_frame_desc[i].offset = frames * ep->stride;
1366 urb->iso_frame_desc[i].length = counts * ep->stride;
edcd3633
DM		 1367 frames += counts;
1368 urb->number_of_packets++;
1369 subs->transfer_done += counts;
1370 if (subs->transfer_done >= runtime->period_size) {
1371 subs->transfer_done -= runtime->period_size;
976b6c06 1372 subs->frame_limit = 0;
edcd3633
DM		 1373 period_elapsed = 1;
1374 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1375 if (subs->transfer_done > 0) {
1376 /* FIXME: fill-max mode is not
1377 * supported yet */
1378 frames -= subs->transfer_done;
1379 counts -= subs->transfer_done;
1380 urb->iso_frame_desc[i].length =
8a2a74d2 1381 counts * ep->stride;
edcd3633
DM		 1382 subs->transfer_done = 0;
1383 }
1384 i++;
1385 if (i < ctx->packets) {
1386 /* add a transfer delimiter */
1387 urb->iso_frame_desc[i].offset =
8a2a74d2 1388 frames * ep->stride;
edcd3633
DM		 1389 urb->iso_frame_desc[i].length = 0;
1390 urb->number_of_packets++;
1391 }
1392 break;
1393 }
1394 }
976b6c06
AS		 1395 /* finish at the period boundary or after enough frames */
1396 if ((period_elapsed ||
1397 subs->transfer_done >= subs->frame_limit) &&
1398 !snd_usb_endpoint_implicit_feedback_sink(ep))
edcd3633
DM		 1399 break;
1400 }
8a2a74d2 1401 bytes = frames * ep->stride;
d24f5061
DM		 1402
1403 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1404 subs->cur_audiofmt->dsd_dop)) {
1405 fill_playback_urb_dsd_dop(subs, urb, bytes);
44dcbbb1
DM		 1406 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1407 subs->cur_audiofmt->dsd_bitrev)) {
1408 /* bit-reverse the bytes */
1409 u8 *buf = urb->transfer_buffer;
1410 for (i = 0; i < bytes; i++) {
1411 int idx = (subs->hwptr_done + i)
1412 % (runtime->buffer_size * stride);
1413 buf[i] = bitrev8(runtime->dma_area[idx]);
1414 }
1415
1416 subs->hwptr_done += bytes;
edcd3633 1417 } else {
d24f5061
DM		 1418 /* usual PCM */
1419 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1420 /* err, the transferred area goes over buffer boundary. */
1421 unsigned int bytes1 =
1422 runtime->buffer_size * stride - subs->hwptr_done;
1423 memcpy(urb->transfer_buffer,
1424 runtime->dma_area + subs->hwptr_done, bytes1);
1425 memcpy(urb->transfer_buffer + bytes1,
1426 runtime->dma_area, bytes - bytes1);
1427 } else {
1428 memcpy(urb->transfer_buffer,
1429 runtime->dma_area + subs->hwptr_done, bytes);
1430 }
1431
1432 subs->hwptr_done += bytes;
edcd3633 1433 }
d24f5061 1434
edcd3633
DM		 1435 if (subs->hwptr_done >= runtime->buffer_size * stride)
1436 subs->hwptr_done -= runtime->buffer_size * stride;
fbcfbf5f
DM		 1437
1438 /* update delay with exact number of samples queued */
1439 runtime->delay = subs->last_delay;
edcd3633 1440 runtime->delay += frames;
fbcfbf5f
DM		 1441 subs->last_delay = runtime->delay;
1442
1443 /* realign last_frame_number */
1444 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1445 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1446
edcd3633
DM		 1447 spin_unlock_irqrestore(&subs->lock, flags);
1448 urb->transfer_buffer_length = bytes;
1449 if (period_elapsed)
1450 snd_pcm_period_elapsed(subs->pcm_substream);
1451}
1452
1453/*
1454 * process after playback data complete
1455 * - decrease the delay count again
1456 */
1457static void retire_playback_urb(struct snd_usb_substream *subs,
1458 struct urb *urb)
1459{
1460 unsigned long flags;
1461 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
8a2a74d2
DM		 1462 struct snd_usb_endpoint *ep = subs->data_endpoint;
1463 int processed = urb->transfer_buffer_length / ep->stride;
fbcfbf5f 1464 int est_delay;
edcd3633 1465
1213a205
TI		 1466 /* ignore the delay accounting when procssed=0 is given, i.e.
1467 * silent payloads are procssed before handling the actual data
1468 */
1469 if (!processed)
1470 return;
1471
edcd3633 1472 spin_lock_irqsave(&subs->lock, flags);
48779a0b
TI		 1473 if (!subs->last_delay)
1474 goto out; /* short path */
1475
fbcfbf5f
DM		 1476 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1477 /* update delay with exact number of samples played */
1478 if (processed > subs->last_delay)
1479 subs->last_delay = 0;
edcd3633 1480 else
fbcfbf5f
DM		 1481 subs->last_delay -= processed;
1482 runtime->delay = subs->last_delay;
1483
1484 /*
1485 * Report when delay estimate is off by more than 2ms.
1486 * The error should be lower than 2ms since the estimate relies
1487 * on two reads of a counter updated every ms.
1488 */
1489 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1490 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1491 est_delay, subs->last_delay);
1492
48779a0b
TI		 1493 if (!subs->running) {
1494 /* update last_frame_number for delay counting here since
1495 * prepare_playback_urb won't be called during pause
1496 */
1497 subs->last_frame_number =
1498 usb_get_current_frame_number(subs->dev) & 0xff;
1499 }
1500
1501 out:
edcd3633 1502 spin_unlock_irqrestore(&subs->lock, flags);
e5779998
DM		 1503}
1504
1505static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1506{
1507 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1508}
1509
1510static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1511{
1512 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1513}
1514
1515static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1516{
1517 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1518}
1519
1520static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1521{
1522 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1523}
1524
edcd3633
DM		 1525static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1526 int cmd)
1527{
1528 struct snd_usb_substream *subs = substream->runtime->private_data;
1529
1530 switch (cmd) {
1531 case SNDRV_PCM_TRIGGER_START:
1532 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1533 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1534 subs->data_endpoint->retire_data_urb = retire_playback_urb;
97f8d3b6 1535 subs->running = 1;
edcd3633
DM		 1536 return 0;
1537 case SNDRV_PCM_TRIGGER_STOP:
a9bb3626 1538 stop_endpoints(subs, false);
97f8d3b6 1539 subs->running = 0;
edcd3633
DM		 1540 return 0;
1541 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1542 subs->data_endpoint->prepare_data_urb = NULL;
48779a0b
TI		 1543 /* keep retire_data_urb for delay calculation */
1544 subs->data_endpoint->retire_data_urb = retire_playback_urb;
97f8d3b6 1545 subs->running = 0;
edcd3633
DM		 1546 return 0;
1547 }
1548
1549 return -EINVAL;
1550}
1551
afe25967
DM		 1552static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1553 int cmd)
edcd3633
DM		 1554{
1555 int err;
1556 struct snd_usb_substream *subs = substream->runtime->private_data;
1557
1558 switch (cmd) {
1559 case SNDRV_PCM_TRIGGER_START:
a9bb3626 1560 err = start_endpoints(subs, false);
edcd3633
DM		 1561 if (err < 0)
1562 return err;
1563
1564 subs->data_endpoint->retire_data_urb = retire_capture_urb;
97f8d3b6 1565 subs->running = 1;
edcd3633
DM		 1566 return 0;
1567 case SNDRV_PCM_TRIGGER_STOP:
a9bb3626 1568 stop_endpoints(subs, false);
97f8d3b6 1569 subs->running = 0;
edcd3633
DM		 1570 return 0;
1571 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1572 subs->data_endpoint->retire_data_urb = NULL;
97f8d3b6 1573 subs->running = 0;
edcd3633
DM		 1574 return 0;
1575 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1576 subs->data_endpoint->retire_data_urb = retire_capture_urb;
97f8d3b6 1577 subs->running = 1;
edcd3633
DM		 1578 return 0;
1579 }
1580
1581 return -EINVAL;
1582}
1583
e5779998
DM		 1584static struct snd_pcm_ops snd_usb_playback_ops = {
1585 .open = snd_usb_playback_open,
1586 .close = snd_usb_playback_close,
1587 .ioctl = snd_pcm_lib_ioctl,
1588 .hw_params = snd_usb_hw_params,
1589 .hw_free = snd_usb_hw_free,
1590 .prepare = snd_usb_pcm_prepare,
1591 .trigger = snd_usb_substream_playback_trigger,
1592 .pointer = snd_usb_pcm_pointer,
1593 .page = snd_pcm_lib_get_vmalloc_page,
1594 .mmap = snd_pcm_lib_mmap_vmalloc,
1595};
1596
1597static struct snd_pcm_ops snd_usb_capture_ops = {
1598 .open = snd_usb_capture_open,
1599 .close = snd_usb_capture_close,
1600 .ioctl = snd_pcm_lib_ioctl,
1601 .hw_params = snd_usb_hw_params,
1602 .hw_free = snd_usb_hw_free,
1603 .prepare = snd_usb_pcm_prepare,
1604 .trigger = snd_usb_substream_capture_trigger,
1605 .pointer = snd_usb_pcm_pointer,
1606 .page = snd_pcm_lib_get_vmalloc_page,
1607 .mmap = snd_pcm_lib_mmap_vmalloc,
1608};
1609
1610void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1611{
1612 snd_pcm_set_ops(pcm, stream,
1613 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1614 &snd_usb_playback_ops : &snd_usb_capture_ops);
1615}
Linux kernel - Deliverables
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