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Linux 3.11-rc3
[cris-mirror.git] / sound / usb / pcm.c
blob15b151ed4899c6032704d361b9c641d2b53b849f
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 (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 ep = get_endpoint(alts, 0)->bEndpointAddress;
163
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,
168 data, sizeof(data))) < 0) {
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 }
176
177 static 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];
183 int err;
184
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,
189 data, sizeof(data))) < 0) {
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
198 /*
199 * initialize the pitch control and sample rate
200 */
201 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
202 struct usb_host_interface *alts,
203 struct audioformat *fmt)
204 {
205 /* if endpoint doesn't have pitch control, bail out */
206 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
207 return 0;
208
209 switch (fmt->protocol) {
210 case UAC_VERSION_1:
211 default:
212 return init_pitch_v1(chip, iface, alts, fmt);
213
214 case UAC_VERSION_2:
215 return init_pitch_v2(chip, iface, alts, fmt);
216 }
217 }
218
219 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
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;
232 err = snd_usb_endpoint_start(ep, can_sleep);
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
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
258 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
259
260 ep->sync_slave = subs->data_endpoint;
261 err = snd_usb_endpoint_start(ep, can_sleep);
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
271 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
272 {
273 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
274 snd_usb_endpoint_stop(subs->sync_endpoint);
275
276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
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 }
283 }
284
285 static int deactivate_endpoints(struct snd_usb_substream *subs)
286 {
287 int reta, retb;
288
289 reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
290 retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
291
292 if (reta < 0)
293 return reta;
294
295 if (retb < 0)
296 return retb;
297
298 return 0;
299 }
300
301 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
302 unsigned int altsetting,
303 struct usb_host_interface **alts,
304 unsigned int *ep)
305 {
306 struct usb_interface *iface;
307 struct usb_interface_descriptor *altsd;
308 struct usb_endpoint_descriptor *epd;
309
310 iface = usb_ifnum_to_if(dev, ifnum);
311 if (!iface || iface->num_altsetting < altsetting + 1)
312 return -ENOENT;
313 *alts = &iface->altsetting[altsetting];
314 altsd = get_iface_desc(*alts);
315 if (altsd->bAlternateSetting != altsetting ||
316 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
317 (altsd->bInterfaceSubClass != 2 &&
318 altsd->bInterfaceProtocol != 2 ) ||
319 altsd->bNumEndpoints < 1)
320 return -ENOENT;
321 epd = get_endpoint(*alts, 0);
322 if (!usb_endpoint_is_isoc_in(epd) ||
323 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
324 USB_ENDPOINT_USAGE_IMPLICIT_FB)
325 return -ENOENT;
326 *ep = epd->bEndpointAddress;
327 return 0;
328 }
329
330 /*
331 * find a matching format and set up the interface
332 */
333 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
334 {
335 struct usb_device *dev = subs->dev;
336 struct usb_host_interface *alts;
337 struct usb_interface_descriptor *altsd;
338 struct usb_interface *iface;
339 unsigned int ep, attr;
340 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
341 int err, implicit_fb = 0;
342
343 iface = usb_ifnum_to_if(dev, fmt->iface);
344 if (WARN_ON(!iface))
345 return -EINVAL;
346 alts = &iface->altsetting[fmt->altset_idx];
347 altsd = get_iface_desc(alts);
348 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
349 return -EINVAL;
350
351 if (fmt == subs->cur_audiofmt)
352 return 0;
353
354 /* close the old interface */
355 if (subs->interface >= 0 && subs->interface != fmt->iface) {
356 err = usb_set_interface(subs->dev, subs->interface, 0);
357 if (err < 0) {
358 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
359 dev->devnum, fmt->iface, fmt->altsetting, err);
360 return -EIO;
361 }
362 subs->interface = -1;
363 subs->altset_idx = 0;
364 }
365
366 /* set interface */
367 if (subs->interface != fmt->iface ||
368 subs->altset_idx != fmt->altset_idx) {
369 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
370 if (err < 0) {
371 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
372 dev->devnum, fmt->iface, fmt->altsetting, err);
373 return -EIO;
374 }
375 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
376 fmt->iface, fmt->altsetting);
377 subs->interface = fmt->iface;
378 subs->altset_idx = fmt->altset_idx;
379
380 snd_usb_set_interface_quirk(dev);
381 }
382
383 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
384 alts, fmt->endpoint, subs->direction,
385 SND_USB_ENDPOINT_TYPE_DATA);
386 if (!subs->data_endpoint)
387 return -EINVAL;
388
389 /* we need a sync pipe in async OUT or adaptive IN mode */
390 /* check the number of EP, since some devices have broken
391 * descriptors which fool us. if it has only one EP,
392 * assume it as adaptive-out or sync-in.
393 */
394 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
395
396 switch (subs->stream->chip->usb_id) {
397 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
398 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
399 if (is_playback) {
400 implicit_fb = 1;
401 ep = 0x81;
402 iface = usb_ifnum_to_if(dev, 3);
403
404 if (!iface || iface->num_altsetting == 0)
405 return -EINVAL;
406
407 alts = &iface->altsetting[1];
408 goto add_sync_ep;
409 }
410 break;
411 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
412 case USB_ID(0x0763, 0x2081):
413 if (is_playback) {
414 implicit_fb = 1;
415 ep = 0x81;
416 iface = usb_ifnum_to_if(dev, 2);
417
418 if (!iface || iface->num_altsetting == 0)
419 return -EINVAL;
420
421 alts = &iface->altsetting[1];
422 goto add_sync_ep;
423 }
424 }
425 if (is_playback &&
426 attr == USB_ENDPOINT_SYNC_ASYNC &&
427 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
428 altsd->bInterfaceProtocol == 2 &&
429 altsd->bNumEndpoints == 1 &&
430 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
431 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
432 altsd->bAlternateSetting,
433 &alts, &ep) >= 0) {
434 implicit_fb = 1;
435 goto add_sync_ep;
436 }
437
438 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
439 (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
440 altsd->bNumEndpoints >= 2) {
441 /* check sync-pipe endpoint */
442 /* ... and check descriptor size before accessing bSynchAddress
443 because there is a version of the SB Audigy 2 NX firmware lacking
444 the audio fields in the endpoint descriptors */
445 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
446 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
447 get_endpoint(alts, 1)->bSynchAddress != 0 &&
448 !implicit_fb)) {
449 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
450 dev->devnum, fmt->iface, fmt->altsetting,
451 get_endpoint(alts, 1)->bmAttributes,
452 get_endpoint(alts, 1)->bLength,
453 get_endpoint(alts, 1)->bSynchAddress);
454 return -EINVAL;
455 }
456 ep = get_endpoint(alts, 1)->bEndpointAddress;
457 if (!implicit_fb &&
458 get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
459 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
460 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
461 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
462 dev->devnum, fmt->iface, fmt->altsetting,
463 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
464 return -EINVAL;
465 }
466
467 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
468 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
469
470 add_sync_ep:
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 return -EINVAL;
478
479 subs->data_endpoint->sync_master = subs->sync_endpoint;
480 }
481
482 if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
483 return err;
484
485 subs->cur_audiofmt = fmt;
486
487 snd_usb_set_format_quirk(subs, fmt);
488
489 #if 0
490 printk(KERN_DEBUG
491 "setting done: format = %d, rate = %d..%d, channels = %d\n",
492 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
493 printk(KERN_DEBUG
494 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
495 subs->datapipe, subs->syncpipe);
496 #endif
497
498 return 0;
499 }
500
501 /*
502 * Return the score of matching two audioformats.
503 * Veto the audioformat if:
504 * - It has no channels for some reason.
505 * - Requested PCM format is not supported.
506 * - Requested sample rate is not supported.
507 */
508 static int match_endpoint_audioformats(struct audioformat *fp,
509 struct audioformat *match, int rate,
510 snd_pcm_format_t pcm_format)
511 {
512 int i;
513 int score = 0;
514
515 if (fp->channels < 1) {
516 snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
517 return 0;
518 }
519
520 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
521 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
522 fp, pcm_format);
523 return 0;
524 }
525
526 for (i = 0; i < fp->nr_rates; i++) {
527 if (fp->rate_table[i] == rate) {
528 score++;
529 break;
530 }
531 }
532 if (!score) {
533 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
534 fp, rate);
535 return 0;
536 }
537
538 if (fp->channels == match->channels)
539 score++;
540
541 snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);
542
543 return score;
544 }
545
546 /*
547 * Configure the sync ep using the rate and pcm format of the data ep.
548 */
549 static int configure_sync_endpoint(struct snd_usb_substream *subs)
550 {
551 int ret;
552 struct audioformat *fp;
553 struct audioformat *sync_fp = NULL;
554 int cur_score = 0;
555 int sync_period_bytes = subs->period_bytes;
556 struct snd_usb_substream *sync_subs =
557 &subs->stream->substream[subs->direction ^ 1];
558
559 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
560 !subs->stream)
561 return snd_usb_endpoint_set_params(subs->sync_endpoint,
562 subs->pcm_format,
563 subs->channels,
564 subs->period_bytes,
565 subs->cur_rate,
566 subs->cur_audiofmt,
567 NULL);
568
569 /* Try to find the best matching audioformat. */
570 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
571 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
572 subs->cur_rate, subs->pcm_format);
573
574 if (score > cur_score) {
575 sync_fp = fp;
576 cur_score = score;
577 }
578 }
579
580 if (unlikely(sync_fp == NULL)) {
581 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
582 __func__, sync_subs->ep_num);
583 return -EINVAL;
584 }
585
586 /*
587 * Recalculate the period bytes if channel number differ between
588 * data and sync ep audioformat.
589 */
590 if (sync_fp->channels != subs->channels) {
591 sync_period_bytes = (subs->period_bytes / subs->channels) *
592 sync_fp->channels;
593 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
594 __func__, subs->period_bytes, sync_period_bytes);
595 }
596
597 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
598 subs->pcm_format,
599 sync_fp->channels,
600 sync_period_bytes,
601 subs->cur_rate,
602 sync_fp,
603 NULL);
604
605 return ret;
606 }
607
608 /*
609 * configure endpoint params
610 *
611 * called during initial setup and upon resume
612 */
613 static int configure_endpoint(struct snd_usb_substream *subs)
614 {
615 int ret;
616
617 /* format changed */
618 stop_endpoints(subs, true);
619 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
620 subs->pcm_format,
621 subs->channels,
622 subs->period_bytes,
623 subs->cur_rate,
624 subs->cur_audiofmt,
625 subs->sync_endpoint);
626 if (ret < 0)
627 return ret;
628
629 if (subs->sync_endpoint)
630 ret = configure_sync_endpoint(subs);
631
632 return ret;
633 }
634
635 /*
636 * hw_params callback
637 *
638 * allocate a buffer and set the given audio format.
639 *
640 * so far we use a physically linear buffer although packetize transfer
641 * doesn't need a continuous area.
642 * if sg buffer is supported on the later version of alsa, we'll follow
643 * that.
644 */
645 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
646 struct snd_pcm_hw_params *hw_params)
647 {
648 struct snd_usb_substream *subs = substream->runtime->private_data;
649 struct audioformat *fmt;
650 int ret;
651
652 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
653 params_buffer_bytes(hw_params));
654 if (ret < 0)
655 return ret;
656
657 subs->pcm_format = params_format(hw_params);
658 subs->period_bytes = params_period_bytes(hw_params);
659 subs->channels = params_channels(hw_params);
660 subs->cur_rate = params_rate(hw_params);
661
662 fmt = find_format(subs);
663 if (!fmt) {
664 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
665 subs->pcm_format, subs->cur_rate, subs->channels);
666 return -EINVAL;
667 }
668
669 down_read(&subs->stream->chip->shutdown_rwsem);
670 if (subs->stream->chip->shutdown)
671 ret = -ENODEV;
672 else
673 ret = set_format(subs, fmt);
674 up_read(&subs->stream->chip->shutdown_rwsem);
675 if (ret < 0)
676 return ret;
677
678 subs->interface = fmt->iface;
679 subs->altset_idx = fmt->altset_idx;
680 subs->need_setup_ep = true;
681
682 return 0;
683 }
684
685 /*
686 * hw_free callback
687 *
688 * reset the audio format and release the buffer
689 */
690 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
691 {
692 struct snd_usb_substream *subs = substream->runtime->private_data;
693
694 subs->cur_audiofmt = NULL;
695 subs->cur_rate = 0;
696 subs->period_bytes = 0;
697 down_read(&subs->stream->chip->shutdown_rwsem);
698 if (!subs->stream->chip->shutdown) {
699 stop_endpoints(subs, true);
700 deactivate_endpoints(subs);
701 }
702 up_read(&subs->stream->chip->shutdown_rwsem);
703 return snd_pcm_lib_free_vmalloc_buffer(substream);
704 }
705
706 /*
707 * prepare callback
708 *
709 * only a few subtle things...
710 */
711 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
712 {
713 struct snd_pcm_runtime *runtime = substream->runtime;
714 struct snd_usb_substream *subs = runtime->private_data;
715 struct usb_host_interface *alts;
716 struct usb_interface *iface;
717 int ret;
718
719 if (! subs->cur_audiofmt) {
720 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
721 return -ENXIO;
722 }
723
724 down_read(&subs->stream->chip->shutdown_rwsem);
725 if (subs->stream->chip->shutdown) {
726 ret = -ENODEV;
727 goto unlock;
728 }
729 if (snd_BUG_ON(!subs->data_endpoint)) {
730 ret = -EIO;
731 goto unlock;
732 }
733
734 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
735 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
736
737 ret = set_format(subs, subs->cur_audiofmt);
738 if (ret < 0)
739 goto unlock;
740
741 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
742 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
743 ret = snd_usb_init_sample_rate(subs->stream->chip,
744 subs->cur_audiofmt->iface,
745 alts,
746 subs->cur_audiofmt,
747 subs->cur_rate);
748 if (ret < 0)
749 goto unlock;
750
751 if (subs->need_setup_ep) {
752 ret = configure_endpoint(subs);
753 if (ret < 0)
754 goto unlock;
755 subs->need_setup_ep = false;
756 }
757
758 /* some unit conversions in runtime */
759 subs->data_endpoint->maxframesize =
760 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
761 subs->data_endpoint->curframesize =
762 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
763
764 /* reset the pointer */
765 subs->hwptr_done = 0;
766 subs->transfer_done = 0;
767 subs->last_delay = 0;
768 subs->last_frame_number = 0;
769 runtime->delay = 0;
770
771 /* for playback, submit the URBs now; otherwise, the first hwptr_done
772 * updates for all URBs would happen at the same time when starting */
773 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
774 ret = start_endpoints(subs, true);
775
776 unlock:
777 up_read(&subs->stream->chip->shutdown_rwsem);
778 return ret;
779 }
780
781 static struct snd_pcm_hardware snd_usb_hardware =
782 {
783 .info = SNDRV_PCM_INFO_MMAP |
784 SNDRV_PCM_INFO_MMAP_VALID |
785 SNDRV_PCM_INFO_BATCH |
786 SNDRV_PCM_INFO_INTERLEAVED |
787 SNDRV_PCM_INFO_BLOCK_TRANSFER |
788 SNDRV_PCM_INFO_PAUSE,
789 .buffer_bytes_max = 1024 * 1024,
790 .period_bytes_min = 64,
791 .period_bytes_max = 512 * 1024,
792 .periods_min = 2,
793 .periods_max = 1024,
794 };
795
796 static int hw_check_valid_format(struct snd_usb_substream *subs,
797 struct snd_pcm_hw_params *params,
798 struct audioformat *fp)
799 {
800 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
801 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
802 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
803 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
804 struct snd_mask check_fmts;
805 unsigned int ptime;
806
807 /* check the format */
808 snd_mask_none(&check_fmts);
809 check_fmts.bits[0] = (u32)fp->formats;
810 check_fmts.bits[1] = (u32)(fp->formats >> 32);
811 snd_mask_intersect(&check_fmts, fmts);
812 if (snd_mask_empty(&check_fmts)) {
813 hwc_debug(" > check: no supported format %d\n", fp->format);
814 return 0;
815 }
816 /* check the channels */
817 if (fp->channels < ct->min || fp->channels > ct->max) {
818 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
819 return 0;
820 }
821 /* check the rate is within the range */
822 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
823 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
824 return 0;
825 }
826 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
827 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
828 return 0;
829 }
830 /* check whether the period time is >= the data packet interval */
831 if (subs->speed != USB_SPEED_FULL) {
832 ptime = 125 * (1 << fp->datainterval);
833 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
834 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
835 return 0;
836 }
837 }
838 return 1;
839 }
840
841 static int hw_rule_rate(struct snd_pcm_hw_params *params,
842 struct snd_pcm_hw_rule *rule)
843 {
844 struct snd_usb_substream *subs = rule->private;
845 struct audioformat *fp;
846 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
847 unsigned int rmin, rmax;
848 int changed;
849
850 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
851 changed = 0;
852 rmin = rmax = 0;
853 list_for_each_entry(fp, &subs->fmt_list, list) {
854 if (!hw_check_valid_format(subs, params, fp))
855 continue;
856 if (changed++) {
857 if (rmin > fp->rate_min)
858 rmin = fp->rate_min;
859 if (rmax < fp->rate_max)
860 rmax = fp->rate_max;
861 } else {
862 rmin = fp->rate_min;
863 rmax = fp->rate_max;
864 }
865 }
866
867 if (!changed) {
868 hwc_debug(" --> get empty\n");
869 it->empty = 1;
870 return -EINVAL;
871 }
872
873 changed = 0;
874 if (it->min < rmin) {
875 it->min = rmin;
876 it->openmin = 0;
877 changed = 1;
878 }
879 if (it->max > rmax) {
880 it->max = rmax;
881 it->openmax = 0;
882 changed = 1;
883 }
884 if (snd_interval_checkempty(it)) {
885 it->empty = 1;
886 return -EINVAL;
887 }
888 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
889 return changed;
890 }
891
892
893 static int hw_rule_channels(struct snd_pcm_hw_params *params,
894 struct snd_pcm_hw_rule *rule)
895 {
896 struct snd_usb_substream *subs = rule->private;
897 struct audioformat *fp;
898 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
899 unsigned int rmin, rmax;
900 int changed;
901
902 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
903 changed = 0;
904 rmin = rmax = 0;
905 list_for_each_entry(fp, &subs->fmt_list, list) {
906 if (!hw_check_valid_format(subs, params, fp))
907 continue;
908 if (changed++) {
909 if (rmin > fp->channels)
910 rmin = fp->channels;
911 if (rmax < fp->channels)
912 rmax = fp->channels;
913 } else {
914 rmin = fp->channels;
915 rmax = fp->channels;
916 }
917 }
918
919 if (!changed) {
920 hwc_debug(" --> get empty\n");
921 it->empty = 1;
922 return -EINVAL;
923 }
924
925 changed = 0;
926 if (it->min < rmin) {
927 it->min = rmin;
928 it->openmin = 0;
929 changed = 1;
930 }
931 if (it->max > rmax) {
932 it->max = rmax;
933 it->openmax = 0;
934 changed = 1;
935 }
936 if (snd_interval_checkempty(it)) {
937 it->empty = 1;
938 return -EINVAL;
939 }
940 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
941 return changed;
942 }
943
944 static int hw_rule_format(struct snd_pcm_hw_params *params,
945 struct snd_pcm_hw_rule *rule)
946 {
947 struct snd_usb_substream *subs = rule->private;
948 struct audioformat *fp;
949 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
950 u64 fbits;
951 u32 oldbits[2];
952 int changed;
953
954 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
955 fbits = 0;
956 list_for_each_entry(fp, &subs->fmt_list, list) {
957 if (!hw_check_valid_format(subs, params, fp))
958 continue;
959 fbits |= fp->formats;
960 }
961
962 oldbits[0] = fmt->bits[0];
963 oldbits[1] = fmt->bits[1];
964 fmt->bits[0] &= (u32)fbits;
965 fmt->bits[1] &= (u32)(fbits >> 32);
966 if (!fmt->bits[0] && !fmt->bits[1]) {
967 hwc_debug(" --> get empty\n");
968 return -EINVAL;
969 }
970 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
971 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
972 return changed;
973 }
974
975 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
976 struct snd_pcm_hw_rule *rule)
977 {
978 struct snd_usb_substream *subs = rule->private;
979 struct audioformat *fp;
980 struct snd_interval *it;
981 unsigned char min_datainterval;
982 unsigned int pmin;
983 int changed;
984
985 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
986 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
987 min_datainterval = 0xff;
988 list_for_each_entry(fp, &subs->fmt_list, list) {
989 if (!hw_check_valid_format(subs, params, fp))
990 continue;
991 min_datainterval = min(min_datainterval, fp->datainterval);
992 }
993 if (min_datainterval == 0xff) {
994 hwc_debug(" --> get empty\n");
995 it->empty = 1;
996 return -EINVAL;
997 }
998 pmin = 125 * (1 << min_datainterval);
999 changed = 0;
1000 if (it->min < pmin) {
1001 it->min = pmin;
1002 it->openmin = 0;
1003 changed = 1;
1004 }
1005 if (snd_interval_checkempty(it)) {
1006 it->empty = 1;
1007 return -EINVAL;
1008 }
1009 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1010 return changed;
1011 }
1012
1013 /*
1014 * If the device supports unusual bit rates, does the request meet these?
1015 */
1016 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1017 struct snd_usb_substream *subs)
1018 {
1019 struct audioformat *fp;
1020 int *rate_list;
1021 int count = 0, needs_knot = 0;
1022 int err;
1023
1024 kfree(subs->rate_list.list);
1025 subs->rate_list.list = NULL;
1026
1027 list_for_each_entry(fp, &subs->fmt_list, list) {
1028 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1029 return 0;
1030 count += fp->nr_rates;
1031 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1032 needs_knot = 1;
1033 }
1034 if (!needs_knot)
1035 return 0;
1036
1037 subs->rate_list.list = rate_list =
1038 kmalloc(sizeof(int) * count, GFP_KERNEL);
1039 if (!subs->rate_list.list)
1040 return -ENOMEM;
1041 subs->rate_list.count = count;
1042 subs->rate_list.mask = 0;
1043 count = 0;
1044 list_for_each_entry(fp, &subs->fmt_list, list) {
1045 int i;
1046 for (i = 0; i < fp->nr_rates; i++)
1047 rate_list[count++] = fp->rate_table[i];
1048 }
1049 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1050 &subs->rate_list);
1051 if (err < 0)
1052 return err;
1053
1054 return 0;
1055 }
1056
1057
1058 /*
1059 * set up the runtime hardware information.
1060 */
1061
1062 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1063 {
1064 struct audioformat *fp;
1065 unsigned int pt, ptmin;
1066 int param_period_time_if_needed;
1067 int err;
1068
1069 runtime->hw.formats = subs->formats;
1070
1071 runtime->hw.rate_min = 0x7fffffff;
1072 runtime->hw.rate_max = 0;
1073 runtime->hw.channels_min = 256;
1074 runtime->hw.channels_max = 0;
1075 runtime->hw.rates = 0;
1076 ptmin = UINT_MAX;
1077 /* check min/max rates and channels */
1078 list_for_each_entry(fp, &subs->fmt_list, list) {
1079 runtime->hw.rates |= fp->rates;
1080 if (runtime->hw.rate_min > fp->rate_min)
1081 runtime->hw.rate_min = fp->rate_min;
1082 if (runtime->hw.rate_max < fp->rate_max)
1083 runtime->hw.rate_max = fp->rate_max;
1084 if (runtime->hw.channels_min > fp->channels)
1085 runtime->hw.channels_min = fp->channels;
1086 if (runtime->hw.channels_max < fp->channels)
1087 runtime->hw.channels_max = fp->channels;
1088 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1089 /* FIXME: there might be more than one audio formats... */
1090 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1091 fp->frame_size;
1092 }
1093 pt = 125 * (1 << fp->datainterval);
1094 ptmin = min(ptmin, pt);
1095 }
1096 err = snd_usb_autoresume(subs->stream->chip);
1097 if (err < 0)
1098 return err;
1099
1100 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1101 if (subs->speed == USB_SPEED_FULL)
1102 /* full speed devices have fixed data packet interval */
1103 ptmin = 1000;
1104 if (ptmin == 1000)
1105 /* if period time doesn't go below 1 ms, no rules needed */
1106 param_period_time_if_needed = -1;
1107 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1108 ptmin, UINT_MAX);
1109
1110 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1111 hw_rule_rate, subs,
1112 SNDRV_PCM_HW_PARAM_FORMAT,
1113 SNDRV_PCM_HW_PARAM_CHANNELS,
1114 param_period_time_if_needed,
1115 -1)) < 0)
1116 goto rep_err;
1117 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1118 hw_rule_channels, subs,
1119 SNDRV_PCM_HW_PARAM_FORMAT,
1120 SNDRV_PCM_HW_PARAM_RATE,
1121 param_period_time_if_needed,
1122 -1)) < 0)
1123 goto rep_err;
1124 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1125 hw_rule_format, subs,
1126 SNDRV_PCM_HW_PARAM_RATE,
1127 SNDRV_PCM_HW_PARAM_CHANNELS,
1128 param_period_time_if_needed,
1129 -1)) < 0)
1130 goto rep_err;
1131 if (param_period_time_if_needed >= 0) {
1132 err = snd_pcm_hw_rule_add(runtime, 0,
1133 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1134 hw_rule_period_time, subs,
1135 SNDRV_PCM_HW_PARAM_FORMAT,
1136 SNDRV_PCM_HW_PARAM_CHANNELS,
1137 SNDRV_PCM_HW_PARAM_RATE,
1138 -1);
1139 if (err < 0)
1140 goto rep_err;
1141 }
1142 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1143 goto rep_err;
1144 return 0;
1145
1146 rep_err:
1147 snd_usb_autosuspend(subs->stream->chip);
1148 return err;
1149 }
1150
1151 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1152 {
1153 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1154 struct snd_pcm_runtime *runtime = substream->runtime;
1155 struct snd_usb_substream *subs = &as->substream[direction];
1156
1157 subs->interface = -1;
1158 subs->altset_idx = 0;
1159 runtime->hw = snd_usb_hardware;
1160 runtime->private_data = subs;
1161 subs->pcm_substream = substream;
1162 /* runtime PM is also done there */
1163
1164 /* initialize DSD/DOP context */
1165 subs->dsd_dop.byte_idx = 0;
1166 subs->dsd_dop.channel = 0;
1167 subs->dsd_dop.marker = 1;
1168
1169 return setup_hw_info(runtime, subs);
1170 }
1171
1172 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1173 {
1174 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1175 struct snd_usb_substream *subs = &as->substream[direction];
1176
1177 stop_endpoints(subs, true);
1178
1179 if (!as->chip->shutdown && subs->interface >= 0) {
1180 usb_set_interface(subs->dev, subs->interface, 0);
1181 subs->interface = -1;
1182 }
1183
1184 subs->pcm_substream = NULL;
1185 snd_usb_autosuspend(subs->stream->chip);
1186
1187 return 0;
1188 }
1189
1190 /* Since a URB can handle only a single linear buffer, we must use double
1191 * buffering when the data to be transferred overflows the buffer boundary.
1192 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1193 * for all URBs.
1194 */
1195 static void retire_capture_urb(struct snd_usb_substream *subs,
1196 struct urb *urb)
1197 {
1198 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1199 unsigned int stride, frames, bytes, oldptr;
1200 int i, period_elapsed = 0;
1201 unsigned long flags;
1202 unsigned char *cp;
1203 int current_frame_number;
1204
1205 /* read frame number here, update pointer in critical section */
1206 current_frame_number = usb_get_current_frame_number(subs->dev);
1207
1208 stride = runtime->frame_bits >> 3;
1209
1210 for (i = 0; i < urb->number_of_packets; i++) {
1211 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1212 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1213 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1214 // continue;
1215 }
1216 bytes = urb->iso_frame_desc[i].actual_length;
1217 frames = bytes / stride;
1218 if (!subs->txfr_quirk)
1219 bytes = frames * stride;
1220 if (bytes % (runtime->sample_bits >> 3) != 0) {
1221 int oldbytes = bytes;
1222 bytes = frames * stride;
1223 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1224 oldbytes, bytes);
1225 }
1226 /* update the current pointer */
1227 spin_lock_irqsave(&subs->lock, flags);
1228 oldptr = subs->hwptr_done;
1229 subs->hwptr_done += bytes;
1230 if (subs->hwptr_done >= runtime->buffer_size * stride)
1231 subs->hwptr_done -= runtime->buffer_size * stride;
1232 frames = (bytes + (oldptr % stride)) / stride;
1233 subs->transfer_done += frames;
1234 if (subs->transfer_done >= runtime->period_size) {
1235 subs->transfer_done -= runtime->period_size;
1236 period_elapsed = 1;
1237 }
1238 /* capture delay is by construction limited to one URB,
1239 * reset delays here
1240 */
1241 runtime->delay = subs->last_delay = 0;
1242
1243 /* realign last_frame_number */
1244 subs->last_frame_number = current_frame_number;
1245 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1246
1247 spin_unlock_irqrestore(&subs->lock, flags);
1248 /* copy a data chunk */
1249 if (oldptr + bytes > runtime->buffer_size * stride) {
1250 unsigned int bytes1 =
1251 runtime->buffer_size * stride - oldptr;
1252 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1253 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1254 } else {
1255 memcpy(runtime->dma_area + oldptr, cp, bytes);
1256 }
1257 }
1258
1259 if (period_elapsed)
1260 snd_pcm_period_elapsed(subs->pcm_substream);
1261 }
1262
1263 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1264 struct urb *urb, unsigned int bytes)
1265 {
1266 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1267 unsigned int stride = runtime->frame_bits >> 3;
1268 unsigned int dst_idx = 0;
1269 unsigned int src_idx = subs->hwptr_done;
1270 unsigned int wrap = runtime->buffer_size * stride;
1271 u8 *dst = urb->transfer_buffer;
1272 u8 *src = runtime->dma_area;
1273 u8 marker[] = { 0x05, 0xfa };
1274
1275 /*
1276 * The DSP DOP format defines a way to transport DSD samples over
1277 * normal PCM data endpoints. It requires stuffing of marker bytes
1278 * (0x05 and 0xfa, alternating per sample frame), and then expects
1279 * 2 additional bytes of actual payload. The whole frame is stored
1280 * LSB.
1281 *
1282 * Hence, for a stereo transport, the buffer layout looks like this,
1283 * where L refers to left channel samples and R to right.
1284 *
1285 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1286 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1287 * .....
1288 *
1289 */
1290
1291 while (bytes--) {
1292 if (++subs->dsd_dop.byte_idx == 3) {
1293 /* frame boundary? */
1294 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1295 src_idx += 2;
1296 subs->dsd_dop.byte_idx = 0;
1297
1298 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1299 /* alternate the marker */
1300 subs->dsd_dop.marker++;
1301 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1302 subs->dsd_dop.channel = 0;
1303 }
1304 } else {
1305 /* stuff the DSD payload */
1306 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1307
1308 if (subs->cur_audiofmt->dsd_bitrev)
1309 dst[dst_idx++] = bitrev8(src[idx]);
1310 else
1311 dst[dst_idx++] = src[idx];
1312
1313 subs->hwptr_done++;
1314 }
1315 }
1316 }
1317
1318 static void prepare_playback_urb(struct snd_usb_substream *subs,
1319 struct urb *urb)
1320 {
1321 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1322 struct snd_usb_endpoint *ep = subs->data_endpoint;
1323 struct snd_urb_ctx *ctx = urb->context;
1324 unsigned int counts, frames, bytes;
1325 int i, stride, period_elapsed = 0;
1326 unsigned long flags;
1327
1328 stride = runtime->frame_bits >> 3;
1329
1330 frames = 0;
1331 urb->number_of_packets = 0;
1332 spin_lock_irqsave(&subs->lock, flags);
1333 for (i = 0; i < ctx->packets; i++) {
1334 if (ctx->packet_size[i])
1335 counts = ctx->packet_size[i];
1336 else
1337 counts = snd_usb_endpoint_next_packet_size(ep);
1338
1339 /* set up descriptor */
1340 urb->iso_frame_desc[i].offset = frames * ep->stride;
1341 urb->iso_frame_desc[i].length = counts * ep->stride;
1342 frames += counts;
1343 urb->number_of_packets++;
1344 subs->transfer_done += counts;
1345 if (subs->transfer_done >= runtime->period_size) {
1346 subs->transfer_done -= runtime->period_size;
1347 period_elapsed = 1;
1348 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1349 if (subs->transfer_done > 0) {
1350 /* FIXME: fill-max mode is not
1351 * supported yet */
1352 frames -= subs->transfer_done;
1353 counts -= subs->transfer_done;
1354 urb->iso_frame_desc[i].length =
1355 counts * ep->stride;
1356 subs->transfer_done = 0;
1357 }
1358 i++;
1359 if (i < ctx->packets) {
1360 /* add a transfer delimiter */
1361 urb->iso_frame_desc[i].offset =
1362 frames * ep->stride;
1363 urb->iso_frame_desc[i].length = 0;
1364 urb->number_of_packets++;
1365 }
1366 break;
1367 }
1368 }
1369 if (period_elapsed &&
1370 !snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1371 break;
1372 }
1373 bytes = frames * ep->stride;
1374
1375 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1376 subs->cur_audiofmt->dsd_dop)) {
1377 fill_playback_urb_dsd_dop(subs, urb, bytes);
1378 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1379 subs->cur_audiofmt->dsd_bitrev)) {
1380 /* bit-reverse the bytes */
1381 u8 *buf = urb->transfer_buffer;
1382 for (i = 0; i < bytes; i++) {
1383 int idx = (subs->hwptr_done + i)
1384 % (runtime->buffer_size * stride);
1385 buf[i] = bitrev8(runtime->dma_area[idx]);
1386 }
1387
1388 subs->hwptr_done += bytes;
1389 } else {
1390 /* usual PCM */
1391 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1392 /* err, the transferred area goes over buffer boundary. */
1393 unsigned int bytes1 =
1394 runtime->buffer_size * stride - subs->hwptr_done;
1395 memcpy(urb->transfer_buffer,
1396 runtime->dma_area + subs->hwptr_done, bytes1);
1397 memcpy(urb->transfer_buffer + bytes1,
1398 runtime->dma_area, bytes - bytes1);
1399 } else {
1400 memcpy(urb->transfer_buffer,
1401 runtime->dma_area + subs->hwptr_done, bytes);
1402 }
1403
1404 subs->hwptr_done += bytes;
1405 }
1406
1407 if (subs->hwptr_done >= runtime->buffer_size * stride)
1408 subs->hwptr_done -= runtime->buffer_size * stride;
1409
1410 /* update delay with exact number of samples queued */
1411 runtime->delay = subs->last_delay;
1412 runtime->delay += frames;
1413 subs->last_delay = runtime->delay;
1414
1415 /* realign last_frame_number */
1416 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1417 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1418
1419 spin_unlock_irqrestore(&subs->lock, flags);
1420 urb->transfer_buffer_length = bytes;
1421 if (period_elapsed)
1422 snd_pcm_period_elapsed(subs->pcm_substream);
1423 }
1424
1425 /*
1426 * process after playback data complete
1427 * - decrease the delay count again
1428 */
1429 static void retire_playback_urb(struct snd_usb_substream *subs,
1430 struct urb *urb)
1431 {
1432 unsigned long flags;
1433 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1434 struct snd_usb_endpoint *ep = subs->data_endpoint;
1435 int processed = urb->transfer_buffer_length / ep->stride;
1436 int est_delay;
1437
1438 /* ignore the delay accounting when procssed=0 is given, i.e.
1439 * silent payloads are procssed before handling the actual data
1440 */
1441 if (!processed)
1442 return;
1443
1444 spin_lock_irqsave(&subs->lock, flags);
1445 if (!subs->last_delay)
1446 goto out; /* short path */
1447
1448 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1449 /* update delay with exact number of samples played */
1450 if (processed > subs->last_delay)
1451 subs->last_delay = 0;
1452 else
1453 subs->last_delay -= processed;
1454 runtime->delay = subs->last_delay;
1455
1456 /*
1457 * Report when delay estimate is off by more than 2ms.
1458 * The error should be lower than 2ms since the estimate relies
1459 * on two reads of a counter updated every ms.
1460 */
1461 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1462 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1463 est_delay, subs->last_delay);
1464
1465 if (!subs->running) {
1466 /* update last_frame_number for delay counting here since
1467 * prepare_playback_urb won't be called during pause
1468 */
1469 subs->last_frame_number =
1470 usb_get_current_frame_number(subs->dev) & 0xff;
1471 }
1472
1473 out:
1474 spin_unlock_irqrestore(&subs->lock, flags);
1475 }
1476
1477 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1478 {
1479 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1480 }
1481
1482 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1483 {
1484 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1485 }
1486
1487 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1488 {
1489 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1490 }
1491
1492 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1493 {
1494 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1495 }
1496
1497 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1498 int cmd)
1499 {
1500 struct snd_usb_substream *subs = substream->runtime->private_data;
1501
1502 switch (cmd) {
1503 case SNDRV_PCM_TRIGGER_START:
1504 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1505 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1506 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1507 subs->running = 1;
1508 return 0;
1509 case SNDRV_PCM_TRIGGER_STOP:
1510 stop_endpoints(subs, false);
1511 subs->running = 0;
1512 return 0;
1513 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1514 subs->data_endpoint->prepare_data_urb = NULL;
1515 /* keep retire_data_urb for delay calculation */
1516 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1517 subs->running = 0;
1518 return 0;
1519 }
1520
1521 return -EINVAL;
1522 }
1523
1524 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1525 int cmd)
1526 {
1527 int err;
1528 struct snd_usb_substream *subs = substream->runtime->private_data;
1529
1530 switch (cmd) {
1531 case SNDRV_PCM_TRIGGER_START:
1532 err = start_endpoints(subs, false);
1533 if (err < 0)
1534 return err;
1535
1536 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1537 subs->running = 1;
1538 return 0;
1539 case SNDRV_PCM_TRIGGER_STOP:
1540 stop_endpoints(subs, false);
1541 subs->running = 0;
1542 return 0;
1543 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1544 subs->data_endpoint->retire_data_urb = NULL;
1545 subs->running = 0;
1546 return 0;
1547 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1548 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1549 subs->running = 1;
1550 return 0;
1551 }
1552
1553 return -EINVAL;
1554 }
1555
1556 static struct snd_pcm_ops snd_usb_playback_ops = {
1557 .open = snd_usb_playback_open,
1558 .close = snd_usb_playback_close,
1559 .ioctl = snd_pcm_lib_ioctl,
1560 .hw_params = snd_usb_hw_params,
1561 .hw_free = snd_usb_hw_free,
1562 .prepare = snd_usb_pcm_prepare,
1563 .trigger = snd_usb_substream_playback_trigger,
1564 .pointer = snd_usb_pcm_pointer,
1565 .page = snd_pcm_lib_get_vmalloc_page,
1566 .mmap = snd_pcm_lib_mmap_vmalloc,
1567 };
1568
1569 static struct snd_pcm_ops snd_usb_capture_ops = {
1570 .open = snd_usb_capture_open,
1571 .close = snd_usb_capture_close,
1572 .ioctl = snd_pcm_lib_ioctl,
1573 .hw_params = snd_usb_hw_params,
1574 .hw_free = snd_usb_hw_free,
1575 .prepare = snd_usb_pcm_prepare,
1576 .trigger = snd_usb_substream_capture_trigger,
1577 .pointer = snd_usb_pcm_pointer,
1578 .page = snd_pcm_lib_get_vmalloc_page,
1579 .mmap = snd_pcm_lib_mmap_vmalloc,
1580 };
1581
1582 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1583 {
1584 snd_pcm_set_ops(pcm, stream,
1585 stream == SNDRV_PCM_STREAM_PLAYBACK ?
1586 &snd_usb_playback_ops : &snd_usb_capture_ops);
1587 }
CRIS linux kernel tree