?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / sound / usb / pcm.c
bloba4e4064f9aee7b1f365ce12e4189d58852e3e00a
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 */
4
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/bitrev.h>
8 #include <linux/ratelimit.h>
9 #include <linux/usb.h>
10 #include <linux/usb/audio.h>
11 #include <linux/usb/audio-v2.h>
12
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16
17 #include "usbaudio.h"
18 #include "card.h"
19 #include "quirks.h"
20 #include "debug.h"
21 #include "endpoint.h"
22 #include "helper.h"
23 #include "pcm.h"
24 #include "clock.h"
25 #include "power.h"
26 #include "media.h"
27
28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
30
31 /* return the estimated delay based on USB frame counters */
32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
33 unsigned int rate)
34 {
35 int current_frame_number;
36 int frame_diff;
37 int est_delay;
38
39 if (!subs->last_delay)
40 return 0; /* short path */
41
42 current_frame_number = usb_get_current_frame_number(subs->dev);
43 /*
44 * HCD implementations use different widths, use lower 8 bits.
45 * The delay will be managed up to 256ms, which is more than
46 * enough
47 */
48 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
49
50 /* Approximation based on number of samples per USB frame (ms),
51 some truncation for 44.1 but the estimate is good enough */
52 est_delay = frame_diff * rate / 1000;
53 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
54 est_delay = subs->last_delay - est_delay;
55 else
56 est_delay = subs->last_delay + est_delay;
57
58 if (est_delay < 0)
59 est_delay = 0;
60 return est_delay;
61 }
62
63 /*
64 * return the current pcm pointer. just based on the hwptr_done value.
65 */
66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
67 {
68 struct snd_usb_substream *subs = substream->runtime->private_data;
69 unsigned int hwptr_done;
70
71 if (atomic_read(&subs->stream->chip->shutdown))
72 return SNDRV_PCM_POS_XRUN;
73 spin_lock(&subs->lock);
74 hwptr_done = subs->hwptr_done;
75 substream->runtime->delay = snd_usb_pcm_delay(subs,
76 substream->runtime->rate);
77 spin_unlock(&subs->lock);
78 return hwptr_done / (substream->runtime->frame_bits >> 3);
79 }
80
81 /*
82 * find a matching audio format
83 */
84 static struct audioformat *find_format(struct snd_usb_substream *subs)
85 {
86 struct audioformat *fp;
87 struct audioformat *found = NULL;
88 int cur_attr = 0, attr;
89
90 list_for_each_entry(fp, &subs->fmt_list, list) {
91 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
92 continue;
93 if (fp->channels != subs->channels)
94 continue;
95 if (subs->cur_rate < fp->rate_min ||
96 subs->cur_rate > fp->rate_max)
97 continue;
98 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
99 unsigned int i;
100 for (i = 0; i < fp->nr_rates; i++)
101 if (fp->rate_table[i] == subs->cur_rate)
102 break;
103 if (i >= fp->nr_rates)
104 continue;
105 }
106 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
107 if (! found) {
108 found = fp;
109 cur_attr = attr;
110 continue;
111 }
112 /* avoid async out and adaptive in if the other method
113 * supports the same format.
114 * this is a workaround for the case like
115 * M-audio audiophile USB.
116 */
117 if (attr != cur_attr) {
118 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
119 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
120 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
121 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
122 continue;
123 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
125 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
126 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
127 found = fp;
128 cur_attr = attr;
129 continue;
130 }
131 }
132 /* find the format with the largest max. packet size */
133 if (fp->maxpacksize > found->maxpacksize) {
134 found = fp;
135 cur_attr = attr;
136 }
137 }
138 return found;
139 }
140
141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
142 struct usb_host_interface *alts,
143 struct audioformat *fmt)
144 {
145 struct usb_device *dev = chip->dev;
146 unsigned int ep;
147 unsigned char data[1];
148 int err;
149
150 if (get_iface_desc(alts)->bNumEndpoints < 1)
151 return -EINVAL;
152 ep = get_endpoint(alts, 0)->bEndpointAddress;
153
154 data[0] = 1;
155 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
156 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
157 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
158 data, sizeof(data));
159 if (err < 0) {
160 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
161 iface, ep);
162 return err;
163 }
164
165 return 0;
166 }
167
168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
169 struct usb_host_interface *alts,
170 struct audioformat *fmt)
171 {
172 struct usb_device *dev = chip->dev;
173 unsigned char data[1];
174 int err;
175
176 data[0] = 1;
177 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
178 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
179 UAC2_EP_CS_PITCH << 8, 0,
180 data, sizeof(data));
181 if (err < 0) {
182 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
183 iface, fmt->altsetting);
184 return err;
185 }
186
187 return 0;
188 }
189
190 /*
191 * initialize the pitch control and sample rate
192 */
193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
194 struct usb_host_interface *alts,
195 struct audioformat *fmt)
196 {
197 /* if endpoint doesn't have pitch control, bail out */
198 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
199 return 0;
200
201 switch (fmt->protocol) {
202 case UAC_VERSION_1:
203 default:
204 return init_pitch_v1(chip, iface, alts, fmt);
205
206 case UAC_VERSION_2:
207 return init_pitch_v2(chip, iface, alts, fmt);
208 }
209 }
210
211 static int start_endpoints(struct snd_usb_substream *subs)
212 {
213 int err;
214
215 if (!subs->data_endpoint)
216 return -EINVAL;
217
218 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
219 struct snd_usb_endpoint *ep = subs->data_endpoint;
220
221 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
222
223 ep->data_subs = subs;
224 err = snd_usb_endpoint_start(ep);
225 if (err < 0) {
226 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
227 return err;
228 }
229 }
230
231 if (subs->sync_endpoint &&
232 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
233 struct snd_usb_endpoint *ep = subs->sync_endpoint;
234
235 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
236 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
237 err = usb_set_interface(subs->dev,
238 subs->sync_endpoint->iface,
239 subs->sync_endpoint->altsetting);
240 if (err < 0) {
241 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
242 dev_err(&subs->dev->dev,
243 "%d:%d: cannot set interface (%d)\n",
244 subs->sync_endpoint->iface,
245 subs->sync_endpoint->altsetting, err);
246 return -EIO;
247 }
248 }
249
250 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
251
252 ep->sync_slave = subs->data_endpoint;
253 err = snd_usb_endpoint_start(ep);
254 if (err < 0) {
255 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
256 return err;
257 }
258 }
259
260 return 0;
261 }
262
263 static void sync_pending_stops(struct snd_usb_substream *subs)
264 {
265 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
266 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
267 }
268
269 static void stop_endpoints(struct snd_usb_substream *subs)
270 {
271 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
272 snd_usb_endpoint_stop(subs->sync_endpoint);
273
274 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
275 snd_usb_endpoint_stop(subs->data_endpoint);
276 }
277
278 /* PCM sync_stop callback */
279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
280 {
281 struct snd_usb_substream *subs = substream->runtime->private_data;
282
283 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
284 sync_pending_stops(subs);
285 snd_usb_unlock_shutdown(subs->stream->chip);
286 }
287 return 0;
288 }
289
290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
291 unsigned int altsetting,
292 struct usb_host_interface **alts,
293 unsigned int *ep)
294 {
295 struct usb_interface *iface;
296 struct usb_interface_descriptor *altsd;
297 struct usb_endpoint_descriptor *epd;
298
299 iface = usb_ifnum_to_if(dev, ifnum);
300 if (!iface || iface->num_altsetting < altsetting + 1)
301 return -ENOENT;
302 *alts = &iface->altsetting[altsetting];
303 altsd = get_iface_desc(*alts);
304 if (altsd->bAlternateSetting != altsetting ||
305 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
306 (altsd->bInterfaceSubClass != 2 &&
307 altsd->bInterfaceProtocol != 2 ) ||
308 altsd->bNumEndpoints < 1)
309 return -ENOENT;
310 epd = get_endpoint(*alts, 0);
311 if (!usb_endpoint_is_isoc_in(epd) ||
312 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
313 USB_ENDPOINT_USAGE_IMPLICIT_FB)
314 return -ENOENT;
315 *ep = epd->bEndpointAddress;
316 return 0;
317 }
318
319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
320 * applies. Returns 1 if a quirk was found.
321 */
322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
323 struct usb_device *dev,
324 struct usb_interface_descriptor *altsd,
325 unsigned int attr)
326 {
327 struct usb_host_interface *alts;
328 struct usb_interface *iface;
329 unsigned int ep;
330 unsigned int ifnum;
331
332 /* Implicit feedback sync EPs consumers are always playback EPs */
333 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
334 return 0;
335
336 switch (subs->stream->chip->usb_id) {
337 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
338 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
339 ep = 0x81;
340 ifnum = 3;
341 goto add_sync_ep_from_ifnum;
342 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
343 case USB_ID(0x0763, 0x2081):
344 ep = 0x81;
345 ifnum = 2;
346 goto add_sync_ep_from_ifnum;
347 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
348 ep = 0x86;
349 ifnum = 2;
350 goto add_sync_ep_from_ifnum;
351 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
352 ep = 0x81;
353 ifnum = 2;
354 goto add_sync_ep_from_ifnum;
355 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
356 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
357 ep = 0x81;
358 ifnum = 1;
359 goto add_sync_ep_from_ifnum;
360 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
361 /* MicroBook IIc */
362 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
363 return 0;
364
365 /* MicroBook II */
366 ep = 0x84;
367 ifnum = 0;
368 goto add_sync_ep_from_ifnum;
369 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
370 ep = 0x81;
371 ifnum = 2;
372 goto add_sync_ep_from_ifnum;
373 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
374 /* BOSS Katana amplifiers do not need quirks */
375 return 0;
376 }
377
378 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
379 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
380 altsd->bInterfaceProtocol == 2 &&
381 altsd->bNumEndpoints == 1 &&
382 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
383 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
384 altsd->bAlternateSetting,
385 &alts, &ep) >= 0) {
386 goto add_sync_ep;
387 }
388
389 /* No quirk */
390 return 0;
391
392 add_sync_ep_from_ifnum:
393 iface = usb_ifnum_to_if(dev, ifnum);
394
395 if (!iface || iface->num_altsetting < 2)
396 return -EINVAL;
397
398 alts = &iface->altsetting[1];
399
400 add_sync_ep:
401 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
402 alts, ep, !subs->direction,
403 SND_USB_ENDPOINT_TYPE_DATA);
404 if (!subs->sync_endpoint)
405 return -EINVAL;
406
407 subs->data_endpoint->sync_master = subs->sync_endpoint;
408
409 return 1;
410 }
411
412 static int set_sync_endpoint(struct snd_usb_substream *subs,
413 struct audioformat *fmt,
414 struct usb_device *dev,
415 struct usb_host_interface *alts,
416 struct usb_interface_descriptor *altsd)
417 {
418 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
419 unsigned int ep, attr;
420 bool implicit_fb;
421 int err;
422
423 /* we need a sync pipe in async OUT or adaptive IN mode */
424 /* check the number of EP, since some devices have broken
425 * descriptors which fool us. if it has only one EP,
426 * assume it as adaptive-out or sync-in.
427 */
428 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
429
430 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
431 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
432
433 /*
434 * In these modes the notion of sync_endpoint is irrelevant.
435 * Reset pointers to avoid using stale data from previously
436 * used settings, e.g. when configuration and endpoints were
437 * changed
438 */
439
440 subs->sync_endpoint = NULL;
441 subs->data_endpoint->sync_master = NULL;
442 }
443
444 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
445 if (err < 0)
446 return err;
447
448 /* endpoint set by quirk */
449 if (err > 0)
450 return 0;
451
452 if (altsd->bNumEndpoints < 2)
453 return 0;
454
455 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
456 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
457 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
458 return 0;
459
460 /*
461 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
462 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
463 * error fall back to SYNC mode and don't create sync endpoint
464 */
465
466 /* check sync-pipe endpoint */
467 /* ... and check descriptor size before accessing bSynchAddress
468 because there is a version of the SB Audigy 2 NX firmware lacking
469 the audio fields in the endpoint descriptors */
470 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
471 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
472 get_endpoint(alts, 1)->bSynchAddress != 0)) {
473 dev_err(&dev->dev,
474 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
475 fmt->iface, fmt->altsetting,
476 get_endpoint(alts, 1)->bmAttributes,
477 get_endpoint(alts, 1)->bLength,
478 get_endpoint(alts, 1)->bSynchAddress);
479 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
480 return 0;
481 return -EINVAL;
482 }
483 ep = get_endpoint(alts, 1)->bEndpointAddress;
484 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
485 get_endpoint(alts, 0)->bSynchAddress != 0 &&
486 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
487 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
488 dev_err(&dev->dev,
489 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
490 fmt->iface, fmt->altsetting,
491 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
492 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
493 return 0;
494 return -EINVAL;
495 }
496
497 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
498 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
499
500 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
501 alts, ep, !subs->direction,
502 implicit_fb ?
503 SND_USB_ENDPOINT_TYPE_DATA :
504 SND_USB_ENDPOINT_TYPE_SYNC);
505 if (!subs->sync_endpoint) {
506 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
507 return 0;
508 return -EINVAL;
509 }
510
511 subs->data_endpoint->sync_master = subs->sync_endpoint;
512
513 return 0;
514 }
515
516 /*
517 * find a matching format and set up the interface
518 */
519 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
520 {
521 struct usb_device *dev = subs->dev;
522 struct usb_host_interface *alts;
523 struct usb_interface_descriptor *altsd;
524 struct usb_interface *iface;
525 int err;
526
527 iface = usb_ifnum_to_if(dev, fmt->iface);
528 if (WARN_ON(!iface))
529 return -EINVAL;
530 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
531 if (WARN_ON(!alts))
532 return -EINVAL;
533 altsd = get_iface_desc(alts);
534
535 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
536 return 0;
537
538 /* close the old interface */
539 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
540 if (!subs->stream->chip->keep_iface) {
541 err = usb_set_interface(subs->dev, subs->interface, 0);
542 if (err < 0) {
543 dev_err(&dev->dev,
544 "%d:%d: return to setting 0 failed (%d)\n",
545 fmt->iface, fmt->altsetting, err);
546 return -EIO;
547 }
548 }
549 subs->interface = -1;
550 subs->altset_idx = 0;
551 }
552
553 if (subs->need_setup_fmt)
554 subs->need_setup_fmt = false;
555
556 /* set interface */
557 if (iface->cur_altsetting != alts) {
558 err = snd_usb_select_mode_quirk(subs, fmt);
559 if (err < 0)
560 return -EIO;
561
562 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
563 if (err < 0) {
564 dev_err(&dev->dev,
565 "%d:%d: usb_set_interface failed (%d)\n",
566 fmt->iface, fmt->altsetting, err);
567 return -EIO;
568 }
569 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
570 fmt->iface, fmt->altsetting);
571 snd_usb_set_interface_quirk(dev);
572 }
573
574 subs->interface = fmt->iface;
575 subs->altset_idx = fmt->altset_idx;
576 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
577 alts, fmt->endpoint, subs->direction,
578 SND_USB_ENDPOINT_TYPE_DATA);
579
580 if (!subs->data_endpoint)
581 return -EINVAL;
582
583 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
584 if (err < 0)
585 return err;
586
587 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
588 if (err < 0)
589 return err;
590
591 subs->cur_audiofmt = fmt;
592
593 snd_usb_set_format_quirk(subs, fmt);
594
595 return 0;
596 }
597
598 /*
599 * Return the score of matching two audioformats.
600 * Veto the audioformat if:
601 * - It has no channels for some reason.
602 * - Requested PCM format is not supported.
603 * - Requested sample rate is not supported.
604 */
605 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
606 struct audioformat *fp,
607 struct audioformat *match, int rate,
608 snd_pcm_format_t pcm_format)
609 {
610 int i;
611 int score = 0;
612
613 if (fp->channels < 1) {
614 dev_dbg(&subs->dev->dev,
615 "%s: (fmt @%p) no channels\n", __func__, fp);
616 return 0;
617 }
618
619 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
620 dev_dbg(&subs->dev->dev,
621 "%s: (fmt @%p) no match for format %d\n", __func__,
622 fp, pcm_format);
623 return 0;
624 }
625
626 for (i = 0; i < fp->nr_rates; i++) {
627 if (fp->rate_table[i] == rate) {
628 score++;
629 break;
630 }
631 }
632 if (!score) {
633 dev_dbg(&subs->dev->dev,
634 "%s: (fmt @%p) no match for rate %d\n", __func__,
635 fp, rate);
636 return 0;
637 }
638
639 if (fp->channels == match->channels)
640 score++;
641
642 dev_dbg(&subs->dev->dev,
643 "%s: (fmt @%p) score %d\n", __func__, fp, score);
644
645 return score;
646 }
647
648 /*
649 * Configure the sync ep using the rate and pcm format of the data ep.
650 */
651 static int configure_sync_endpoint(struct snd_usb_substream *subs)
652 {
653 int ret;
654 struct audioformat *fp;
655 struct audioformat *sync_fp = NULL;
656 int cur_score = 0;
657 int sync_period_bytes = subs->period_bytes;
658 struct snd_usb_substream *sync_subs =
659 &subs->stream->substream[subs->direction ^ 1];
660
661 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
662 !subs->stream)
663 return snd_usb_endpoint_set_params(subs->sync_endpoint,
664 subs->pcm_format,
665 subs->channels,
666 subs->period_bytes,
667 0, 0,
668 subs->cur_rate,
669 subs->cur_audiofmt,
670 NULL);
671
672 /* Try to find the best matching audioformat. */
673 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
674 int score = match_endpoint_audioformats(subs,
675 fp, subs->cur_audiofmt,
676 subs->cur_rate, subs->pcm_format);
677
678 if (score > cur_score) {
679 sync_fp = fp;
680 cur_score = score;
681 }
682 }
683
684 if (unlikely(sync_fp == NULL)) {
685 dev_err(&subs->dev->dev,
686 "%s: no valid audioformat for sync ep %x found\n",
687 __func__, sync_subs->ep_num);
688 return -EINVAL;
689 }
690
691 /*
692 * Recalculate the period bytes if channel number differ between
693 * data and sync ep audioformat.
694 */
695 if (sync_fp->channels != subs->channels) {
696 sync_period_bytes = (subs->period_bytes / subs->channels) *
697 sync_fp->channels;
698 dev_dbg(&subs->dev->dev,
699 "%s: adjusted sync ep period bytes (%d -> %d)\n",
700 __func__, subs->period_bytes, sync_period_bytes);
701 }
702
703 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
704 subs->pcm_format,
705 sync_fp->channels,
706 sync_period_bytes,
707 0, 0,
708 subs->cur_rate,
709 sync_fp,
710 NULL);
711
712 return ret;
713 }
714
715 /*
716 * configure endpoint params
717 *
718 * called during initial setup and upon resume
719 */
720 static int configure_endpoint(struct snd_usb_substream *subs)
721 {
722 int ret;
723
724 /* format changed */
725 stop_endpoints(subs);
726 sync_pending_stops(subs);
727 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
728 subs->pcm_format,
729 subs->channels,
730 subs->period_bytes,
731 subs->period_frames,
732 subs->buffer_periods,
733 subs->cur_rate,
734 subs->cur_audiofmt,
735 subs->sync_endpoint);
736 if (ret < 0)
737 return ret;
738
739 if (subs->sync_endpoint)
740 ret = configure_sync_endpoint(subs);
741
742 return ret;
743 }
744
745 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
746 {
747 int ret;
748
749 if (!subs->str_pd)
750 return 0;
751
752 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
753 if (ret < 0) {
754 dev_err(&subs->dev->dev,
755 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
756 subs->str_pd->pd_id, state, ret);
757 return ret;
758 }
759
760 return 0;
761 }
762
763 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
764 {
765 int ret;
766
767 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
768 if (ret < 0)
769 return ret;
770
771 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
772 if (ret < 0)
773 return ret;
774
775 return 0;
776 }
777
778 int snd_usb_pcm_resume(struct snd_usb_stream *as)
779 {
780 int ret;
781
782 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
783 if (ret < 0)
784 return ret;
785
786 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
787 if (ret < 0)
788 return ret;
789
790 return 0;
791 }
792
793 /*
794 * hw_params callback
795 *
796 * allocate a buffer and set the given audio format.
797 *
798 * so far we use a physically linear buffer although packetize transfer
799 * doesn't need a continuous area.
800 * if sg buffer is supported on the later version of alsa, we'll follow
801 * that.
802 */
803 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
804 struct snd_pcm_hw_params *hw_params)
805 {
806 struct snd_usb_substream *subs = substream->runtime->private_data;
807 struct audioformat *fmt;
808 int ret;
809
810 ret = snd_media_start_pipeline(subs);
811 if (ret)
812 return ret;
813
814 subs->pcm_format = params_format(hw_params);
815 subs->period_bytes = params_period_bytes(hw_params);
816 subs->period_frames = params_period_size(hw_params);
817 subs->buffer_periods = params_periods(hw_params);
818 subs->channels = params_channels(hw_params);
819 subs->cur_rate = params_rate(hw_params);
820
821 fmt = find_format(subs);
822 if (!fmt) {
823 dev_dbg(&subs->dev->dev,
824 "cannot set format: format = %#x, rate = %d, channels = %d\n",
825 subs->pcm_format, subs->cur_rate, subs->channels);
826 ret = -EINVAL;
827 goto stop_pipeline;
828 }
829
830 ret = snd_usb_lock_shutdown(subs->stream->chip);
831 if (ret < 0)
832 goto stop_pipeline;
833
834 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
835 if (ret < 0)
836 goto unlock;
837
838 ret = set_format(subs, fmt);
839 if (ret < 0)
840 goto unlock;
841
842 subs->interface = fmt->iface;
843 subs->altset_idx = fmt->altset_idx;
844 subs->need_setup_ep = true;
845
846 unlock:
847 snd_usb_unlock_shutdown(subs->stream->chip);
848 if (ret < 0)
849 goto stop_pipeline;
850 return ret;
851
852 stop_pipeline:
853 snd_media_stop_pipeline(subs);
854 return ret;
855 }
856
857 /*
858 * hw_free callback
859 *
860 * reset the audio format and release the buffer
861 */
862 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
863 {
864 struct snd_usb_substream *subs = substream->runtime->private_data;
865
866 snd_media_stop_pipeline(subs);
867 subs->cur_audiofmt = NULL;
868 subs->cur_rate = 0;
869 subs->period_bytes = 0;
870 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
871 stop_endpoints(subs);
872 sync_pending_stops(subs);
873 snd_usb_endpoint_deactivate(subs->sync_endpoint);
874 snd_usb_endpoint_deactivate(subs->data_endpoint);
875 snd_usb_unlock_shutdown(subs->stream->chip);
876 }
877
878 return 0;
879 }
880
881 /*
882 * prepare callback
883 *
884 * only a few subtle things...
885 */
886 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
887 {
888 struct snd_pcm_runtime *runtime = substream->runtime;
889 struct snd_usb_substream *subs = runtime->private_data;
890 struct usb_host_interface *alts;
891 struct usb_interface *iface;
892 int ret;
893
894 if (! subs->cur_audiofmt) {
895 dev_err(&subs->dev->dev, "no format is specified!\n");
896 return -ENXIO;
897 }
898
899 ret = snd_usb_lock_shutdown(subs->stream->chip);
900 if (ret < 0)
901 return ret;
902 if (snd_BUG_ON(!subs->data_endpoint)) {
903 ret = -EIO;
904 goto unlock;
905 }
906
907 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
908 if (ret < 0)
909 goto unlock;
910
911 ret = set_format(subs, subs->cur_audiofmt);
912 if (ret < 0)
913 goto unlock;
914
915 if (subs->need_setup_ep) {
916
917 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
918 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
919 ret = snd_usb_init_sample_rate(subs->stream->chip,
920 subs->cur_audiofmt->iface,
921 alts,
922 subs->cur_audiofmt,
923 subs->cur_rate);
924 if (ret < 0)
925 goto unlock;
926
927 ret = configure_endpoint(subs);
928 if (ret < 0)
929 goto unlock;
930 subs->need_setup_ep = false;
931 }
932
933 /* some unit conversions in runtime */
934 subs->data_endpoint->maxframesize =
935 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
936 subs->data_endpoint->curframesize =
937 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
938
939 /* reset the pointer */
940 subs->hwptr_done = 0;
941 subs->transfer_done = 0;
942 subs->last_delay = 0;
943 subs->last_frame_number = 0;
944 runtime->delay = 0;
945
946 /* for playback, submit the URBs now; otherwise, the first hwptr_done
947 * updates for all URBs would happen at the same time when starting */
948 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
949 ret = start_endpoints(subs);
950
951 unlock:
952 snd_usb_unlock_shutdown(subs->stream->chip);
953 return ret;
954 }
955
956 static const struct snd_pcm_hardware snd_usb_hardware =
957 {
958 .info = SNDRV_PCM_INFO_MMAP |
959 SNDRV_PCM_INFO_MMAP_VALID |
960 SNDRV_PCM_INFO_BATCH |
961 SNDRV_PCM_INFO_INTERLEAVED |
962 SNDRV_PCM_INFO_BLOCK_TRANSFER |
963 SNDRV_PCM_INFO_PAUSE,
964 .buffer_bytes_max = 1024 * 1024,
965 .period_bytes_min = 64,
966 .period_bytes_max = 512 * 1024,
967 .periods_min = 2,
968 .periods_max = 1024,
969 };
970
971 static int hw_check_valid_format(struct snd_usb_substream *subs,
972 struct snd_pcm_hw_params *params,
973 struct audioformat *fp)
974 {
975 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
976 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
977 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
978 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
979 struct snd_mask check_fmts;
980 unsigned int ptime;
981
982 /* check the format */
983 snd_mask_none(&check_fmts);
984 check_fmts.bits[0] = (u32)fp->formats;
985 check_fmts.bits[1] = (u32)(fp->formats >> 32);
986 snd_mask_intersect(&check_fmts, fmts);
987 if (snd_mask_empty(&check_fmts)) {
988 hwc_debug(" > check: no supported format %d\n", fp->format);
989 return 0;
990 }
991 /* check the channels */
992 if (fp->channels < ct->min || fp->channels > ct->max) {
993 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
994 return 0;
995 }
996 /* check the rate is within the range */
997 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
998 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
999 return 0;
1000 }
1001 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1002 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1003 return 0;
1004 }
1005 /* check whether the period time is >= the data packet interval */
1006 if (subs->speed != USB_SPEED_FULL) {
1007 ptime = 125 * (1 << fp->datainterval);
1008 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1009 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1010 return 0;
1011 }
1012 }
1013 return 1;
1014 }
1015
1016 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1017 struct snd_pcm_hw_rule *rule)
1018 {
1019 struct snd_usb_substream *subs = rule->private;
1020 struct audioformat *fp;
1021 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1022 unsigned int rmin, rmax;
1023 int changed;
1024
1025 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1026 changed = 0;
1027 rmin = rmax = 0;
1028 list_for_each_entry(fp, &subs->fmt_list, list) {
1029 if (!hw_check_valid_format(subs, params, fp))
1030 continue;
1031 if (changed++) {
1032 if (rmin > fp->rate_min)
1033 rmin = fp->rate_min;
1034 if (rmax < fp->rate_max)
1035 rmax = fp->rate_max;
1036 } else {
1037 rmin = fp->rate_min;
1038 rmax = fp->rate_max;
1039 }
1040 }
1041
1042 if (!changed) {
1043 hwc_debug(" --> get empty\n");
1044 it->empty = 1;
1045 return -EINVAL;
1046 }
1047
1048 changed = 0;
1049 if (it->min < rmin) {
1050 it->min = rmin;
1051 it->openmin = 0;
1052 changed = 1;
1053 }
1054 if (it->max > rmax) {
1055 it->max = rmax;
1056 it->openmax = 0;
1057 changed = 1;
1058 }
1059 if (snd_interval_checkempty(it)) {
1060 it->empty = 1;
1061 return -EINVAL;
1062 }
1063 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1064 return changed;
1065 }
1066
1067
1068 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1069 struct snd_pcm_hw_rule *rule)
1070 {
1071 struct snd_usb_substream *subs = rule->private;
1072 struct audioformat *fp;
1073 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1074 unsigned int rmin, rmax;
1075 int changed;
1076
1077 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1078 changed = 0;
1079 rmin = rmax = 0;
1080 list_for_each_entry(fp, &subs->fmt_list, list) {
1081 if (!hw_check_valid_format(subs, params, fp))
1082 continue;
1083 if (changed++) {
1084 if (rmin > fp->channels)
1085 rmin = fp->channels;
1086 if (rmax < fp->channels)
1087 rmax = fp->channels;
1088 } else {
1089 rmin = fp->channels;
1090 rmax = fp->channels;
1091 }
1092 }
1093
1094 if (!changed) {
1095 hwc_debug(" --> get empty\n");
1096 it->empty = 1;
1097 return -EINVAL;
1098 }
1099
1100 changed = 0;
1101 if (it->min < rmin) {
1102 it->min = rmin;
1103 it->openmin = 0;
1104 changed = 1;
1105 }
1106 if (it->max > rmax) {
1107 it->max = rmax;
1108 it->openmax = 0;
1109 changed = 1;
1110 }
1111 if (snd_interval_checkempty(it)) {
1112 it->empty = 1;
1113 return -EINVAL;
1114 }
1115 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1116 return changed;
1117 }
1118
1119 static int hw_rule_format(struct snd_pcm_hw_params *params,
1120 struct snd_pcm_hw_rule *rule)
1121 {
1122 struct snd_usb_substream *subs = rule->private;
1123 struct audioformat *fp;
1124 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1125 u64 fbits;
1126 u32 oldbits[2];
1127 int changed;
1128
1129 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1130 fbits = 0;
1131 list_for_each_entry(fp, &subs->fmt_list, list) {
1132 if (!hw_check_valid_format(subs, params, fp))
1133 continue;
1134 fbits |= fp->formats;
1135 }
1136
1137 oldbits[0] = fmt->bits[0];
1138 oldbits[1] = fmt->bits[1];
1139 fmt->bits[0] &= (u32)fbits;
1140 fmt->bits[1] &= (u32)(fbits >> 32);
1141 if (!fmt->bits[0] && !fmt->bits[1]) {
1142 hwc_debug(" --> get empty\n");
1143 return -EINVAL;
1144 }
1145 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1146 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1147 return changed;
1148 }
1149
1150 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1151 struct snd_pcm_hw_rule *rule)
1152 {
1153 struct snd_usb_substream *subs = rule->private;
1154 struct audioformat *fp;
1155 struct snd_interval *it;
1156 unsigned char min_datainterval;
1157 unsigned int pmin;
1158 int changed;
1159
1160 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1161 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1162 min_datainterval = 0xff;
1163 list_for_each_entry(fp, &subs->fmt_list, list) {
1164 if (!hw_check_valid_format(subs, params, fp))
1165 continue;
1166 min_datainterval = min(min_datainterval, fp->datainterval);
1167 }
1168 if (min_datainterval == 0xff) {
1169 hwc_debug(" --> get empty\n");
1170 it->empty = 1;
1171 return -EINVAL;
1172 }
1173 pmin = 125 * (1 << min_datainterval);
1174 changed = 0;
1175 if (it->min < pmin) {
1176 it->min = pmin;
1177 it->openmin = 0;
1178 changed = 1;
1179 }
1180 if (snd_interval_checkempty(it)) {
1181 it->empty = 1;
1182 return -EINVAL;
1183 }
1184 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1185 return changed;
1186 }
1187
1188 /*
1189 * If the device supports unusual bit rates, does the request meet these?
1190 */
1191 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1192 struct snd_usb_substream *subs)
1193 {
1194 struct audioformat *fp;
1195 int *rate_list;
1196 int count = 0, needs_knot = 0;
1197 int err;
1198
1199 kfree(subs->rate_list.list);
1200 subs->rate_list.list = NULL;
1201
1202 list_for_each_entry(fp, &subs->fmt_list, list) {
1203 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1204 return 0;
1205 count += fp->nr_rates;
1206 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1207 needs_knot = 1;
1208 }
1209 if (!needs_knot)
1210 return 0;
1211
1212 subs->rate_list.list = rate_list =
1213 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1214 if (!subs->rate_list.list)
1215 return -ENOMEM;
1216 subs->rate_list.count = count;
1217 subs->rate_list.mask = 0;
1218 count = 0;
1219 list_for_each_entry(fp, &subs->fmt_list, list) {
1220 int i;
1221 for (i = 0; i < fp->nr_rates; i++)
1222 rate_list[count++] = fp->rate_table[i];
1223 }
1224 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1225 &subs->rate_list);
1226 if (err < 0)
1227 return err;
1228
1229 return 0;
1230 }
1231
1232
1233 /*
1234 * set up the runtime hardware information.
1235 */
1236
1237 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1238 {
1239 struct audioformat *fp;
1240 unsigned int pt, ptmin;
1241 int param_period_time_if_needed;
1242 int err;
1243
1244 runtime->hw.formats = subs->formats;
1245
1246 runtime->hw.rate_min = 0x7fffffff;
1247 runtime->hw.rate_max = 0;
1248 runtime->hw.channels_min = 256;
1249 runtime->hw.channels_max = 0;
1250 runtime->hw.rates = 0;
1251 ptmin = UINT_MAX;
1252 /* check min/max rates and channels */
1253 list_for_each_entry(fp, &subs->fmt_list, list) {
1254 runtime->hw.rates |= fp->rates;
1255 if (runtime->hw.rate_min > fp->rate_min)
1256 runtime->hw.rate_min = fp->rate_min;
1257 if (runtime->hw.rate_max < fp->rate_max)
1258 runtime->hw.rate_max = fp->rate_max;
1259 if (runtime->hw.channels_min > fp->channels)
1260 runtime->hw.channels_min = fp->channels;
1261 if (runtime->hw.channels_max < fp->channels)
1262 runtime->hw.channels_max = fp->channels;
1263 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1264 /* FIXME: there might be more than one audio formats... */
1265 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1266 fp->frame_size;
1267 }
1268 pt = 125 * (1 << fp->datainterval);
1269 ptmin = min(ptmin, pt);
1270 }
1271
1272 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1273 if (subs->speed == USB_SPEED_FULL)
1274 /* full speed devices have fixed data packet interval */
1275 ptmin = 1000;
1276 if (ptmin == 1000)
1277 /* if period time doesn't go below 1 ms, no rules needed */
1278 param_period_time_if_needed = -1;
1279
1280 err = snd_pcm_hw_constraint_minmax(runtime,
1281 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1282 ptmin, UINT_MAX);
1283 if (err < 0)
1284 return err;
1285
1286 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1287 hw_rule_rate, subs,
1288 SNDRV_PCM_HW_PARAM_FORMAT,
1289 SNDRV_PCM_HW_PARAM_CHANNELS,
1290 param_period_time_if_needed,
1291 -1);
1292 if (err < 0)
1293 return err;
1294 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1295 hw_rule_channels, subs,
1296 SNDRV_PCM_HW_PARAM_FORMAT,
1297 SNDRV_PCM_HW_PARAM_RATE,
1298 param_period_time_if_needed,
1299 -1);
1300 if (err < 0)
1301 return err;
1302 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1303 hw_rule_format, subs,
1304 SNDRV_PCM_HW_PARAM_RATE,
1305 SNDRV_PCM_HW_PARAM_CHANNELS,
1306 param_period_time_if_needed,
1307 -1);
1308 if (err < 0)
1309 return err;
1310 if (param_period_time_if_needed >= 0) {
1311 err = snd_pcm_hw_rule_add(runtime, 0,
1312 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1313 hw_rule_period_time, subs,
1314 SNDRV_PCM_HW_PARAM_FORMAT,
1315 SNDRV_PCM_HW_PARAM_CHANNELS,
1316 SNDRV_PCM_HW_PARAM_RATE,
1317 -1);
1318 if (err < 0)
1319 return err;
1320 }
1321 err = snd_usb_pcm_check_knot(runtime, subs);
1322 if (err < 0)
1323 return err;
1324
1325 return snd_usb_autoresume(subs->stream->chip);
1326 }
1327
1328 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1329 {
1330 int direction = substream->stream;
1331 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1332 struct snd_pcm_runtime *runtime = substream->runtime;
1333 struct snd_usb_substream *subs = &as->substream[direction];
1334 int ret;
1335
1336 subs->interface = -1;
1337 subs->altset_idx = 0;
1338 runtime->hw = snd_usb_hardware;
1339 runtime->private_data = subs;
1340 subs->pcm_substream = substream;
1341 /* runtime PM is also done there */
1342
1343 /* initialize DSD/DOP context */
1344 subs->dsd_dop.byte_idx = 0;
1345 subs->dsd_dop.channel = 0;
1346 subs->dsd_dop.marker = 1;
1347
1348 ret = setup_hw_info(runtime, subs);
1349 if (ret == 0) {
1350 ret = snd_media_stream_init(subs, as->pcm, direction);
1351 if (ret)
1352 snd_usb_autosuspend(subs->stream->chip);
1353 }
1354 return ret;
1355 }
1356
1357 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1358 {
1359 int direction = substream->stream;
1360 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1361 struct snd_usb_substream *subs = &as->substream[direction];
1362 int ret;
1363
1364 snd_media_stop_pipeline(subs);
1365
1366 if (!as->chip->keep_iface &&
1367 subs->interface >= 0 &&
1368 !snd_usb_lock_shutdown(subs->stream->chip)) {
1369 usb_set_interface(subs->dev, subs->interface, 0);
1370 subs->interface = -1;
1371 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1372 snd_usb_unlock_shutdown(subs->stream->chip);
1373 if (ret < 0)
1374 return ret;
1375 }
1376
1377 subs->pcm_substream = NULL;
1378 snd_usb_autosuspend(subs->stream->chip);
1379
1380 return 0;
1381 }
1382
1383 /* Since a URB can handle only a single linear buffer, we must use double
1384 * buffering when the data to be transferred overflows the buffer boundary.
1385 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1386 * for all URBs.
1387 */
1388 static void retire_capture_urb(struct snd_usb_substream *subs,
1389 struct urb *urb)
1390 {
1391 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1392 unsigned int stride, frames, bytes, oldptr;
1393 int i, period_elapsed = 0;
1394 unsigned long flags;
1395 unsigned char *cp;
1396 int current_frame_number;
1397
1398 /* read frame number here, update pointer in critical section */
1399 current_frame_number = usb_get_current_frame_number(subs->dev);
1400
1401 stride = runtime->frame_bits >> 3;
1402
1403 for (i = 0; i < urb->number_of_packets; i++) {
1404 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1405 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1406 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1407 i, urb->iso_frame_desc[i].status);
1408 // continue;
1409 }
1410 bytes = urb->iso_frame_desc[i].actual_length;
1411 frames = bytes / stride;
1412 if (!subs->txfr_quirk)
1413 bytes = frames * stride;
1414 if (bytes % (runtime->sample_bits >> 3) != 0) {
1415 int oldbytes = bytes;
1416 bytes = frames * stride;
1417 dev_warn_ratelimited(&subs->dev->dev,
1418 "Corrected urb data len. %d->%d\n",
1419 oldbytes, bytes);
1420 }
1421 /* update the current pointer */
1422 spin_lock_irqsave(&subs->lock, flags);
1423 oldptr = subs->hwptr_done;
1424 subs->hwptr_done += bytes;
1425 if (subs->hwptr_done >= runtime->buffer_size * stride)
1426 subs->hwptr_done -= runtime->buffer_size * stride;
1427 frames = (bytes + (oldptr % stride)) / stride;
1428 subs->transfer_done += frames;
1429 if (subs->transfer_done >= runtime->period_size) {
1430 subs->transfer_done -= runtime->period_size;
1431 period_elapsed = 1;
1432 }
1433 /* capture delay is by construction limited to one URB,
1434 * reset delays here
1435 */
1436 runtime->delay = subs->last_delay = 0;
1437
1438 /* realign last_frame_number */
1439 subs->last_frame_number = current_frame_number;
1440 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1441
1442 spin_unlock_irqrestore(&subs->lock, flags);
1443 /* copy a data chunk */
1444 if (oldptr + bytes > runtime->buffer_size * stride) {
1445 unsigned int bytes1 =
1446 runtime->buffer_size * stride - oldptr;
1447 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1448 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1449 } else {
1450 memcpy(runtime->dma_area + oldptr, cp, bytes);
1451 }
1452 }
1453
1454 if (period_elapsed)
1455 snd_pcm_period_elapsed(subs->pcm_substream);
1456 }
1457
1458 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1459 struct urb *urb, unsigned int bytes)
1460 {
1461 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1462 unsigned int stride = runtime->frame_bits >> 3;
1463 unsigned int dst_idx = 0;
1464 unsigned int src_idx = subs->hwptr_done;
1465 unsigned int wrap = runtime->buffer_size * stride;
1466 u8 *dst = urb->transfer_buffer;
1467 u8 *src = runtime->dma_area;
1468 u8 marker[] = { 0x05, 0xfa };
1469
1470 /*
1471 * The DSP DOP format defines a way to transport DSD samples over
1472 * normal PCM data endpoints. It requires stuffing of marker bytes
1473 * (0x05 and 0xfa, alternating per sample frame), and then expects
1474 * 2 additional bytes of actual payload. The whole frame is stored
1475 * LSB.
1476 *
1477 * Hence, for a stereo transport, the buffer layout looks like this,
1478 * where L refers to left channel samples and R to right.
1479 *
1480 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1481 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1482 * .....
1483 *
1484 */
1485
1486 while (bytes--) {
1487 if (++subs->dsd_dop.byte_idx == 3) {
1488 /* frame boundary? */
1489 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1490 src_idx += 2;
1491 subs->dsd_dop.byte_idx = 0;
1492
1493 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1494 /* alternate the marker */
1495 subs->dsd_dop.marker++;
1496 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1497 subs->dsd_dop.channel = 0;
1498 }
1499 } else {
1500 /* stuff the DSD payload */
1501 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1502
1503 if (subs->cur_audiofmt->dsd_bitrev)
1504 dst[dst_idx++] = bitrev8(src[idx]);
1505 else
1506 dst[dst_idx++] = src[idx];
1507
1508 subs->hwptr_done++;
1509 }
1510 }
1511 if (subs->hwptr_done >= runtime->buffer_size * stride)
1512 subs->hwptr_done -= runtime->buffer_size * stride;
1513 }
1514
1515 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1516 int offset, int stride, unsigned int bytes)
1517 {
1518 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1519
1520 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1521 /* err, the transferred area goes over buffer boundary. */
1522 unsigned int bytes1 =
1523 runtime->buffer_size * stride - subs->hwptr_done;
1524 memcpy(urb->transfer_buffer + offset,
1525 runtime->dma_area + subs->hwptr_done, bytes1);
1526 memcpy(urb->transfer_buffer + offset + bytes1,
1527 runtime->dma_area, bytes - bytes1);
1528 } else {
1529 memcpy(urb->transfer_buffer + offset,
1530 runtime->dma_area + subs->hwptr_done, bytes);
1531 }
1532 subs->hwptr_done += bytes;
1533 if (subs->hwptr_done >= runtime->buffer_size * stride)
1534 subs->hwptr_done -= runtime->buffer_size * stride;
1535 }
1536
1537 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1538 struct urb *urb, int stride,
1539 unsigned int bytes)
1540 {
1541 __le32 packet_length;
1542 int i;
1543
1544 /* Put __le32 length descriptor at start of each packet. */
1545 for (i = 0; i < urb->number_of_packets; i++) {
1546 unsigned int length = urb->iso_frame_desc[i].length;
1547 unsigned int offset = urb->iso_frame_desc[i].offset;
1548
1549 packet_length = cpu_to_le32(length);
1550 offset += i * sizeof(packet_length);
1551 urb->iso_frame_desc[i].offset = offset;
1552 urb->iso_frame_desc[i].length += sizeof(packet_length);
1553 memcpy(urb->transfer_buffer + offset,
1554 &packet_length, sizeof(packet_length));
1555 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1556 stride, length);
1557 }
1558 /* Adjust transfer size accordingly. */
1559 bytes += urb->number_of_packets * sizeof(packet_length);
1560 return bytes;
1561 }
1562
1563 static void prepare_playback_urb(struct snd_usb_substream *subs,
1564 struct urb *urb)
1565 {
1566 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1567 struct snd_usb_endpoint *ep = subs->data_endpoint;
1568 struct snd_urb_ctx *ctx = urb->context;
1569 unsigned int counts, frames, bytes;
1570 int i, stride, period_elapsed = 0;
1571 unsigned long flags;
1572
1573 stride = runtime->frame_bits >> 3;
1574
1575 frames = 0;
1576 urb->number_of_packets = 0;
1577 spin_lock_irqsave(&subs->lock, flags);
1578 subs->frame_limit += ep->max_urb_frames;
1579 for (i = 0; i < ctx->packets; i++) {
1580 if (ctx->packet_size[i])
1581 counts = ctx->packet_size[i];
1582 else
1583 counts = snd_usb_endpoint_next_packet_size(ep);
1584
1585 /* set up descriptor */
1586 urb->iso_frame_desc[i].offset = frames * ep->stride;
1587 urb->iso_frame_desc[i].length = counts * ep->stride;
1588 frames += counts;
1589 urb->number_of_packets++;
1590 subs->transfer_done += counts;
1591 if (subs->transfer_done >= runtime->period_size) {
1592 subs->transfer_done -= runtime->period_size;
1593 subs->frame_limit = 0;
1594 period_elapsed = 1;
1595 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1596 if (subs->transfer_done > 0) {
1597 /* FIXME: fill-max mode is not
1598 * supported yet */
1599 frames -= subs->transfer_done;
1600 counts -= subs->transfer_done;
1601 urb->iso_frame_desc[i].length =
1602 counts * ep->stride;
1603 subs->transfer_done = 0;
1604 }
1605 i++;
1606 if (i < ctx->packets) {
1607 /* add a transfer delimiter */
1608 urb->iso_frame_desc[i].offset =
1609 frames * ep->stride;
1610 urb->iso_frame_desc[i].length = 0;
1611 urb->number_of_packets++;
1612 }
1613 break;
1614 }
1615 }
1616 /* finish at the period boundary or after enough frames */
1617 if ((period_elapsed ||
1618 subs->transfer_done >= subs->frame_limit) &&
1619 !snd_usb_endpoint_implicit_feedback_sink(ep))
1620 break;
1621 }
1622 bytes = frames * ep->stride;
1623
1624 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1625 subs->cur_audiofmt->dsd_dop)) {
1626 fill_playback_urb_dsd_dop(subs, urb, bytes);
1627 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1628 subs->cur_audiofmt->dsd_bitrev)) {
1629 /* bit-reverse the bytes */
1630 u8 *buf = urb->transfer_buffer;
1631 for (i = 0; i < bytes; i++) {
1632 int idx = (subs->hwptr_done + i)
1633 % (runtime->buffer_size * stride);
1634 buf[i] = bitrev8(runtime->dma_area[idx]);
1635 }
1636
1637 subs->hwptr_done += bytes;
1638 if (subs->hwptr_done >= runtime->buffer_size * stride)
1639 subs->hwptr_done -= runtime->buffer_size * stride;
1640 } else {
1641 /* usual PCM */
1642 if (!subs->tx_length_quirk)
1643 copy_to_urb(subs, urb, 0, stride, bytes);
1644 else
1645 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1646 /* bytes is now amount of outgoing data */
1647 }
1648
1649 /* update delay with exact number of samples queued */
1650 runtime->delay = subs->last_delay;
1651 runtime->delay += frames;
1652 subs->last_delay = runtime->delay;
1653
1654 /* realign last_frame_number */
1655 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1656 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1657
1658 if (subs->trigger_tstamp_pending_update) {
1659 /* this is the first actual URB submitted,
1660 * update trigger timestamp to reflect actual start time
1661 */
1662 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1663 subs->trigger_tstamp_pending_update = false;
1664 }
1665
1666 spin_unlock_irqrestore(&subs->lock, flags);
1667 urb->transfer_buffer_length = bytes;
1668 if (period_elapsed)
1669 snd_pcm_period_elapsed(subs->pcm_substream);
1670 }
1671
1672 /*
1673 * process after playback data complete
1674 * - decrease the delay count again
1675 */
1676 static void retire_playback_urb(struct snd_usb_substream *subs,
1677 struct urb *urb)
1678 {
1679 unsigned long flags;
1680 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1681 struct snd_usb_endpoint *ep = subs->data_endpoint;
1682 int processed = urb->transfer_buffer_length / ep->stride;
1683 int est_delay;
1684
1685 /* ignore the delay accounting when procssed=0 is given, i.e.
1686 * silent payloads are procssed before handling the actual data
1687 */
1688 if (!processed)
1689 return;
1690
1691 spin_lock_irqsave(&subs->lock, flags);
1692 if (!subs->last_delay)
1693 goto out; /* short path */
1694
1695 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1696 /* update delay with exact number of samples played */
1697 if (processed > subs->last_delay)
1698 subs->last_delay = 0;
1699 else
1700 subs->last_delay -= processed;
1701 runtime->delay = subs->last_delay;
1702
1703 /*
1704 * Report when delay estimate is off by more than 2ms.
1705 * The error should be lower than 2ms since the estimate relies
1706 * on two reads of a counter updated every ms.
1707 */
1708 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1709 dev_dbg_ratelimited(&subs->dev->dev,
1710 "delay: estimated %d, actual %d\n",
1711 est_delay, subs->last_delay);
1712
1713 if (!subs->running) {
1714 /* update last_frame_number for delay counting here since
1715 * prepare_playback_urb won't be called during pause
1716 */
1717 subs->last_frame_number =
1718 usb_get_current_frame_number(subs->dev) & 0xff;
1719 }
1720
1721 out:
1722 spin_unlock_irqrestore(&subs->lock, flags);
1723 }
1724
1725 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1726 int cmd)
1727 {
1728 struct snd_usb_substream *subs = substream->runtime->private_data;
1729
1730 switch (cmd) {
1731 case SNDRV_PCM_TRIGGER_START:
1732 subs->trigger_tstamp_pending_update = true;
1733 /* fall through */
1734 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1735 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1736 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1737 subs->running = 1;
1738 return 0;
1739 case SNDRV_PCM_TRIGGER_STOP:
1740 stop_endpoints(subs);
1741 subs->running = 0;
1742 return 0;
1743 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1744 subs->data_endpoint->prepare_data_urb = NULL;
1745 /* keep retire_data_urb for delay calculation */
1746 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1747 subs->running = 0;
1748 return 0;
1749 case SNDRV_PCM_TRIGGER_SUSPEND:
1750 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1751 stop_endpoints(subs);
1752 subs->need_setup_fmt = true;
1753 return 0;
1754 }
1755 break;
1756 }
1757
1758 return -EINVAL;
1759 }
1760
1761 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1762 int cmd)
1763 {
1764 int err;
1765 struct snd_usb_substream *subs = substream->runtime->private_data;
1766
1767 switch (cmd) {
1768 case SNDRV_PCM_TRIGGER_START:
1769 err = start_endpoints(subs);
1770 if (err < 0)
1771 return err;
1772
1773 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1774 subs->running = 1;
1775 return 0;
1776 case SNDRV_PCM_TRIGGER_STOP:
1777 stop_endpoints(subs);
1778 subs->running = 0;
1779 return 0;
1780 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1781 subs->data_endpoint->retire_data_urb = NULL;
1782 subs->running = 0;
1783 return 0;
1784 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1785 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1786 subs->running = 1;
1787 return 0;
1788 case SNDRV_PCM_TRIGGER_SUSPEND:
1789 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1790 stop_endpoints(subs);
1791 subs->need_setup_fmt = true;
1792 return 0;
1793 }
1794 break;
1795 }
1796
1797 return -EINVAL;
1798 }
1799
1800 static const struct snd_pcm_ops snd_usb_playback_ops = {
1801 .open = snd_usb_pcm_open,
1802 .close = snd_usb_pcm_close,
1803 .hw_params = snd_usb_hw_params,
1804 .hw_free = snd_usb_hw_free,
1805 .prepare = snd_usb_pcm_prepare,
1806 .trigger = snd_usb_substream_playback_trigger,
1807 .sync_stop = snd_usb_pcm_sync_stop,
1808 .pointer = snd_usb_pcm_pointer,
1809 };
1810
1811 static const struct snd_pcm_ops snd_usb_capture_ops = {
1812 .open = snd_usb_pcm_open,
1813 .close = snd_usb_pcm_close,
1814 .hw_params = snd_usb_hw_params,
1815 .hw_free = snd_usb_hw_free,
1816 .prepare = snd_usb_pcm_prepare,
1817 .trigger = snd_usb_substream_capture_trigger,
1818 .sync_stop = snd_usb_pcm_sync_stop,
1819 .pointer = snd_usb_pcm_pointer,
1820 };
1821
1822 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1823 {
1824 const struct snd_pcm_ops *ops;
1825
1826 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1827 &snd_usb_playback_ops : &snd_usb_capture_ops;
1828 snd_pcm_set_ops(pcm, stream, ops);
1829 }
1830
1831 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1832 {
1833 struct snd_pcm *pcm = subs->stream->pcm;
1834 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1835 struct device *dev = subs->dev->bus->controller;
1836
1837 if (snd_usb_use_vmalloc)
1838 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1839 NULL, 0, 0);
1840 else
1841 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1842 dev, 64*1024, 512*1024);
1843 }
Linux with added FPC-III support