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 */
snd_usb_pcm_delay(struct snd_usb_substream * subs,unsigned int rate)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 */
snd_usb_pcm_pointer(struct snd_pcm_substream * substream)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 */
find_format(struct snd_usb_substream * subs)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
init_pitch_v1(struct snd_usb_audio * chip,int iface,struct usb_host_interface * alts,struct audioformat * fmt)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
init_pitch_v2(struct snd_usb_audio * chip,int iface,struct usb_host_interface * alts,struct audioformat * fmt)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 */
snd_usb_init_pitch(struct snd_usb_audio * chip,int iface,struct usb_host_interface * alts,struct audioformat * fmt)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
start_endpoints(struct snd_usb_substream * subs)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
sync_pending_stops(struct snd_usb_substream * subs)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
stop_endpoints(struct snd_usb_substream * subs)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 */
snd_usb_pcm_sync_stop(struct snd_pcm_substream * substream)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
search_roland_implicit_fb(struct usb_device * dev,int ifnum,unsigned int altsetting,struct usb_host_interface ** alts,unsigned int * ep)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 */
set_sync_ep_implicit_fb_quirk(struct snd_usb_substream * subs,struct usb_device * dev,struct usb_interface_descriptor * altsd,unsigned int attr)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 case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
340 ep = 0x81;
341 ifnum = 3;
342 goto add_sync_ep_from_ifnum;
343 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
344 case USB_ID(0x0763, 0x2081):
345 ep = 0x81;
346 ifnum = 2;
347 goto add_sync_ep_from_ifnum;
348 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
349 case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
350 ep = 0x86;
351 ifnum = 2;
352 goto add_sync_ep_from_ifnum;
353 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
354 ep = 0x81;
355 ifnum = 2;
356 goto add_sync_ep_from_ifnum;
357 case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
358 ep = 0x82;
359 ifnum = 2;
360 goto add_sync_ep_from_ifnum;
361 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
362 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
363 ep = 0x81;
364 ifnum = 1;
365 goto add_sync_ep_from_ifnum;
366 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
367 /* MicroBook IIc */
368 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
369 return 0;
370
371 /* MicroBook II */
372 ep = 0x84;
373 ifnum = 0;
374 goto add_sync_ep_from_ifnum;
375 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
376 case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
377 case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
378 case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
379 case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
380 ep = 0x81;
381 ifnum = 2;
382 goto add_sync_ep_from_ifnum;
383 case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
384 case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
385 ep = 0x82;
386 ifnum = 0;
387 goto add_sync_ep_from_ifnum;
388 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
389 /* BOSS Katana amplifiers do not need quirks */
390 return 0;
391 }
392
393 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
394 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
395 altsd->bInterfaceProtocol == 2 &&
396 altsd->bNumEndpoints == 1 &&
397 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
398 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
399 altsd->bAlternateSetting,
400 &alts, &ep) >= 0) {
401 goto add_sync_ep;
402 }
403
404 /* No quirk */
405 return 0;
406
407 add_sync_ep_from_ifnum:
408 iface = usb_ifnum_to_if(dev, ifnum);
409
410 if (!iface || iface->num_altsetting < 2)
411 return -EINVAL;
412
413 alts = &iface->altsetting[1];
414
415 add_sync_ep:
416 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
417 alts, ep, !subs->direction,
418 SND_USB_ENDPOINT_TYPE_DATA);
419 if (!subs->sync_endpoint)
420 return -EINVAL;
421
422 subs->sync_endpoint->is_implicit_feedback = 1;
423
424 subs->data_endpoint->sync_master = subs->sync_endpoint;
425
426 return 1;
427 }
428
set_sync_endpoint(struct snd_usb_substream * subs,struct audioformat * fmt,struct usb_device * dev,struct usb_host_interface * alts,struct usb_interface_descriptor * altsd)429 static int set_sync_endpoint(struct snd_usb_substream *subs,
430 struct audioformat *fmt,
431 struct usb_device *dev,
432 struct usb_host_interface *alts,
433 struct usb_interface_descriptor *altsd)
434 {
435 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
436 unsigned int ep, attr;
437 bool implicit_fb;
438 int err;
439
440 /* we need a sync pipe in async OUT or adaptive IN mode */
441 /* check the number of EP, since some devices have broken
442 * descriptors which fool us. if it has only one EP,
443 * assume it as adaptive-out or sync-in.
444 */
445 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
446
447 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
448 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
449
450 /*
451 * In these modes the notion of sync_endpoint is irrelevant.
452 * Reset pointers to avoid using stale data from previously
453 * used settings, e.g. when configuration and endpoints were
454 * changed
455 */
456
457 subs->sync_endpoint = NULL;
458 subs->data_endpoint->sync_master = NULL;
459 }
460
461 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
462 if (err < 0)
463 return err;
464
465 /* endpoint set by quirk */
466 if (err > 0)
467 return 0;
468
469 if (altsd->bNumEndpoints < 2)
470 return 0;
471
472 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
473 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
474 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
475 return 0;
476
477 /*
478 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
479 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
480 * error fall back to SYNC mode and don't create sync endpoint
481 */
482
483 /* check sync-pipe endpoint */
484 /* ... and check descriptor size before accessing bSynchAddress
485 because there is a version of the SB Audigy 2 NX firmware lacking
486 the audio fields in the endpoint descriptors */
487 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
488 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
489 get_endpoint(alts, 1)->bSynchAddress != 0)) {
490 dev_err(&dev->dev,
491 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
492 fmt->iface, fmt->altsetting,
493 get_endpoint(alts, 1)->bmAttributes,
494 get_endpoint(alts, 1)->bLength,
495 get_endpoint(alts, 1)->bSynchAddress);
496 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
497 return 0;
498 return -EINVAL;
499 }
500 ep = get_endpoint(alts, 1)->bEndpointAddress;
501 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
502 get_endpoint(alts, 0)->bSynchAddress != 0 &&
503 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
504 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
505 dev_err(&dev->dev,
506 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
507 fmt->iface, fmt->altsetting,
508 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
509 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
510 return 0;
511 return -EINVAL;
512 }
513
514 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
515 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
516
517 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
518 alts, ep, !subs->direction,
519 implicit_fb ?
520 SND_USB_ENDPOINT_TYPE_DATA :
521 SND_USB_ENDPOINT_TYPE_SYNC);
522
523 if (!subs->sync_endpoint) {
524 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
525 return 0;
526 return -EINVAL;
527 }
528
529 subs->sync_endpoint->is_implicit_feedback = implicit_fb;
530
531 subs->data_endpoint->sync_master = subs->sync_endpoint;
532
533 return 0;
534 }
535
536 /*
537 * find a matching format and set up the interface
538 */
set_format(struct snd_usb_substream * subs,struct audioformat * fmt)539 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
540 {
541 struct usb_device *dev = subs->dev;
542 struct usb_host_interface *alts;
543 struct usb_interface_descriptor *altsd;
544 struct usb_interface *iface;
545 int err;
546
547 iface = usb_ifnum_to_if(dev, fmt->iface);
548 if (WARN_ON(!iface))
549 return -EINVAL;
550 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
551 if (WARN_ON(!alts))
552 return -EINVAL;
553 altsd = get_iface_desc(alts);
554
555 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
556 return 0;
557
558 /* close the old interface */
559 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
560 if (!subs->stream->chip->keep_iface) {
561 err = usb_set_interface(subs->dev, subs->interface, 0);
562 if (err < 0) {
563 dev_err(&dev->dev,
564 "%d:%d: return to setting 0 failed (%d)\n",
565 fmt->iface, fmt->altsetting, err);
566 return -EIO;
567 }
568 }
569 subs->interface = -1;
570 subs->altset_idx = 0;
571 }
572
573 if (subs->need_setup_fmt)
574 subs->need_setup_fmt = false;
575
576 /* set interface */
577 if (iface->cur_altsetting != alts) {
578 err = snd_usb_select_mode_quirk(subs, fmt);
579 if (err < 0)
580 return -EIO;
581
582 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
583 if (err < 0) {
584 dev_err(&dev->dev,
585 "%d:%d: usb_set_interface failed (%d)\n",
586 fmt->iface, fmt->altsetting, err);
587 return -EIO;
588 }
589 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
590 fmt->iface, fmt->altsetting);
591 snd_usb_set_interface_quirk(dev);
592 }
593
594 subs->interface = fmt->iface;
595 subs->altset_idx = fmt->altset_idx;
596 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
597 alts, fmt->endpoint, subs->direction,
598 SND_USB_ENDPOINT_TYPE_DATA);
599
600 if (!subs->data_endpoint)
601 return -EINVAL;
602
603 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
604 if (err < 0)
605 return err;
606
607 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
608 if (err < 0)
609 return err;
610
611 subs->cur_audiofmt = fmt;
612
613 snd_usb_set_format_quirk(subs, fmt);
614
615 return 0;
616 }
617
618 /*
619 * Return the score of matching two audioformats.
620 * Veto the audioformat if:
621 * - It has no channels for some reason.
622 * - Requested PCM format is not supported.
623 * - Requested sample rate is not supported.
624 */
match_endpoint_audioformats(struct snd_usb_substream * subs,struct audioformat * fp,struct audioformat * match,int rate,snd_pcm_format_t pcm_format)625 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
626 struct audioformat *fp,
627 struct audioformat *match, int rate,
628 snd_pcm_format_t pcm_format)
629 {
630 int i;
631 int score = 0;
632
633 if (fp->channels < 1) {
634 dev_dbg(&subs->dev->dev,
635 "%s: (fmt @%p) no channels\n", __func__, fp);
636 return 0;
637 }
638
639 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
640 dev_dbg(&subs->dev->dev,
641 "%s: (fmt @%p) no match for format %d\n", __func__,
642 fp, pcm_format);
643 return 0;
644 }
645
646 for (i = 0; i < fp->nr_rates; i++) {
647 if (fp->rate_table[i] == rate) {
648 score++;
649 break;
650 }
651 }
652 if (!score) {
653 dev_dbg(&subs->dev->dev,
654 "%s: (fmt @%p) no match for rate %d\n", __func__,
655 fp, rate);
656 return 0;
657 }
658
659 if (fp->channels == match->channels)
660 score++;
661
662 dev_dbg(&subs->dev->dev,
663 "%s: (fmt @%p) score %d\n", __func__, fp, score);
664
665 return score;
666 }
667
668 /*
669 * Configure the sync ep using the rate and pcm format of the data ep.
670 */
configure_sync_endpoint(struct snd_usb_substream * subs)671 static int configure_sync_endpoint(struct snd_usb_substream *subs)
672 {
673 int ret;
674 struct audioformat *fp;
675 struct audioformat *sync_fp = NULL;
676 int cur_score = 0;
677 int sync_period_bytes = subs->period_bytes;
678 struct snd_usb_substream *sync_subs =
679 &subs->stream->substream[subs->direction ^ 1];
680
681 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
682 !subs->stream)
683 return snd_usb_endpoint_set_params(subs->sync_endpoint,
684 subs->pcm_format,
685 subs->channels,
686 subs->period_bytes,
687 0, 0,
688 subs->cur_rate,
689 subs->cur_audiofmt,
690 NULL);
691
692 /* Try to find the best matching audioformat. */
693 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
694 int score = match_endpoint_audioformats(subs,
695 fp, subs->cur_audiofmt,
696 subs->cur_rate, subs->pcm_format);
697
698 if (score > cur_score) {
699 sync_fp = fp;
700 cur_score = score;
701 }
702 }
703
704 if (unlikely(sync_fp == NULL)) {
705 dev_err(&subs->dev->dev,
706 "%s: no valid audioformat for sync ep %x found\n",
707 __func__, sync_subs->ep_num);
708 return -EINVAL;
709 }
710
711 /*
712 * Recalculate the period bytes if channel number differ between
713 * data and sync ep audioformat.
714 */
715 if (sync_fp->channels != subs->channels) {
716 sync_period_bytes = (subs->period_bytes / subs->channels) *
717 sync_fp->channels;
718 dev_dbg(&subs->dev->dev,
719 "%s: adjusted sync ep period bytes (%d -> %d)\n",
720 __func__, subs->period_bytes, sync_period_bytes);
721 }
722
723 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
724 subs->pcm_format,
725 sync_fp->channels,
726 sync_period_bytes,
727 0, 0,
728 subs->cur_rate,
729 sync_fp,
730 NULL);
731
732 return ret;
733 }
734
735 /*
736 * configure endpoint params
737 *
738 * called during initial setup and upon resume
739 */
configure_endpoint(struct snd_usb_substream * subs)740 static int configure_endpoint(struct snd_usb_substream *subs)
741 {
742 int ret;
743
744 /* format changed */
745 stop_endpoints(subs);
746 sync_pending_stops(subs);
747 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
748 subs->pcm_format,
749 subs->channels,
750 subs->period_bytes,
751 subs->period_frames,
752 subs->buffer_periods,
753 subs->cur_rate,
754 subs->cur_audiofmt,
755 subs->sync_endpoint);
756 if (ret < 0)
757 return ret;
758
759 if (subs->sync_endpoint)
760 ret = configure_sync_endpoint(subs);
761
762 return ret;
763 }
764
snd_usb_pcm_change_state(struct snd_usb_substream * subs,int state)765 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
766 {
767 int ret;
768
769 if (!subs->str_pd)
770 return 0;
771
772 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
773 if (ret < 0) {
774 dev_err(&subs->dev->dev,
775 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
776 subs->str_pd->pd_id, state, ret);
777 return ret;
778 }
779
780 return 0;
781 }
782
snd_usb_pcm_suspend(struct snd_usb_stream * as)783 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
784 {
785 int ret;
786
787 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
788 if (ret < 0)
789 return ret;
790
791 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
792 if (ret < 0)
793 return ret;
794
795 return 0;
796 }
797
snd_usb_pcm_resume(struct snd_usb_stream * as)798 int snd_usb_pcm_resume(struct snd_usb_stream *as)
799 {
800 int ret;
801
802 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
803 if (ret < 0)
804 return ret;
805
806 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
807 if (ret < 0)
808 return ret;
809
810 return 0;
811 }
812
813 /*
814 * hw_params callback
815 *
816 * allocate a buffer and set the given audio format.
817 *
818 * so far we use a physically linear buffer although packetize transfer
819 * doesn't need a continuous area.
820 * if sg buffer is supported on the later version of alsa, we'll follow
821 * that.
822 */
snd_usb_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)823 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
824 struct snd_pcm_hw_params *hw_params)
825 {
826 struct snd_usb_substream *subs = substream->runtime->private_data;
827 struct audioformat *fmt;
828 int ret;
829
830 ret = snd_media_start_pipeline(subs);
831 if (ret)
832 return ret;
833
834 subs->pcm_format = params_format(hw_params);
835 subs->period_bytes = params_period_bytes(hw_params);
836 subs->period_frames = params_period_size(hw_params);
837 subs->buffer_periods = params_periods(hw_params);
838 subs->channels = params_channels(hw_params);
839 subs->cur_rate = params_rate(hw_params);
840
841 fmt = find_format(subs);
842 if (!fmt) {
843 dev_dbg(&subs->dev->dev,
844 "cannot set format: format = %#x, rate = %d, channels = %d\n",
845 subs->pcm_format, subs->cur_rate, subs->channels);
846 ret = -EINVAL;
847 goto stop_pipeline;
848 }
849
850 ret = snd_usb_lock_shutdown(subs->stream->chip);
851 if (ret < 0)
852 goto stop_pipeline;
853
854 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
855 if (ret < 0)
856 goto unlock;
857
858 ret = set_format(subs, fmt);
859 if (ret < 0)
860 goto unlock;
861
862 subs->interface = fmt->iface;
863 subs->altset_idx = fmt->altset_idx;
864 subs->need_setup_ep = true;
865
866 unlock:
867 snd_usb_unlock_shutdown(subs->stream->chip);
868 if (ret < 0)
869 goto stop_pipeline;
870 return ret;
871
872 stop_pipeline:
873 snd_media_stop_pipeline(subs);
874 return ret;
875 }
876
877 /*
878 * hw_free callback
879 *
880 * reset the audio format and release the buffer
881 */
snd_usb_hw_free(struct snd_pcm_substream * substream)882 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
883 {
884 struct snd_usb_substream *subs = substream->runtime->private_data;
885
886 snd_media_stop_pipeline(subs);
887 subs->cur_audiofmt = NULL;
888 subs->cur_rate = 0;
889 subs->period_bytes = 0;
890 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
891 stop_endpoints(subs);
892 sync_pending_stops(subs);
893 snd_usb_endpoint_deactivate(subs->sync_endpoint);
894 snd_usb_endpoint_deactivate(subs->data_endpoint);
895 snd_usb_unlock_shutdown(subs->stream->chip);
896 }
897
898 return 0;
899 }
900
901 /*
902 * prepare callback
903 *
904 * only a few subtle things...
905 */
snd_usb_pcm_prepare(struct snd_pcm_substream * substream)906 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
907 {
908 struct snd_pcm_runtime *runtime = substream->runtime;
909 struct snd_usb_substream *subs = runtime->private_data;
910 struct usb_host_interface *alts;
911 struct usb_interface *iface;
912 int ret;
913
914 if (! subs->cur_audiofmt) {
915 dev_err(&subs->dev->dev, "no format is specified!\n");
916 return -ENXIO;
917 }
918
919 ret = snd_usb_lock_shutdown(subs->stream->chip);
920 if (ret < 0)
921 return ret;
922 if (snd_BUG_ON(!subs->data_endpoint)) {
923 ret = -EIO;
924 goto unlock;
925 }
926
927 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
928 if (ret < 0)
929 goto unlock;
930
931 ret = set_format(subs, subs->cur_audiofmt);
932 if (ret < 0)
933 goto unlock;
934
935 if (subs->need_setup_ep) {
936
937 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
938 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
939 ret = snd_usb_init_sample_rate(subs->stream->chip,
940 subs->cur_audiofmt->iface,
941 alts,
942 subs->cur_audiofmt,
943 subs->cur_rate);
944 if (ret < 0)
945 goto unlock;
946
947 ret = configure_endpoint(subs);
948 if (ret < 0)
949 goto unlock;
950 subs->need_setup_ep = false;
951 }
952
953 /* some unit conversions in runtime */
954 subs->data_endpoint->maxframesize =
955 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
956 subs->data_endpoint->curframesize =
957 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
958
959 /* reset the pointer */
960 subs->hwptr_done = 0;
961 subs->transfer_done = 0;
962 subs->last_delay = 0;
963 subs->last_frame_number = 0;
964 runtime->delay = 0;
965
966 /* for playback, submit the URBs now; otherwise, the first hwptr_done
967 * updates for all URBs would happen at the same time when starting */
968 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
969 ret = start_endpoints(subs);
970
971 unlock:
972 snd_usb_unlock_shutdown(subs->stream->chip);
973 return ret;
974 }
975
976 static const struct snd_pcm_hardware snd_usb_hardware =
977 {
978 .info = SNDRV_PCM_INFO_MMAP |
979 SNDRV_PCM_INFO_MMAP_VALID |
980 SNDRV_PCM_INFO_BATCH |
981 SNDRV_PCM_INFO_INTERLEAVED |
982 SNDRV_PCM_INFO_BLOCK_TRANSFER |
983 SNDRV_PCM_INFO_PAUSE,
984 .buffer_bytes_max = 1024 * 1024,
985 .period_bytes_min = 64,
986 .period_bytes_max = 512 * 1024,
987 .periods_min = 2,
988 .periods_max = 1024,
989 };
990
hw_check_valid_format(struct snd_usb_substream * subs,struct snd_pcm_hw_params * params,struct audioformat * fp)991 static int hw_check_valid_format(struct snd_usb_substream *subs,
992 struct snd_pcm_hw_params *params,
993 struct audioformat *fp)
994 {
995 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
996 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
997 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
998 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
999 struct snd_mask check_fmts;
1000 unsigned int ptime;
1001
1002 /* check the format */
1003 snd_mask_none(&check_fmts);
1004 check_fmts.bits[0] = (u32)fp->formats;
1005 check_fmts.bits[1] = (u32)(fp->formats >> 32);
1006 snd_mask_intersect(&check_fmts, fmts);
1007 if (snd_mask_empty(&check_fmts)) {
1008 hwc_debug(" > check: no supported format %d\n", fp->format);
1009 return 0;
1010 }
1011 /* check the channels */
1012 if (fp->channels < ct->min || fp->channels > ct->max) {
1013 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1014 return 0;
1015 }
1016 /* check the rate is within the range */
1017 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1018 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1019 return 0;
1020 }
1021 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1022 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1023 return 0;
1024 }
1025 /* check whether the period time is >= the data packet interval */
1026 if (subs->speed != USB_SPEED_FULL) {
1027 ptime = 125 * (1 << fp->datainterval);
1028 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1029 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1030 return 0;
1031 }
1032 }
1033 return 1;
1034 }
1035
hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1036 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1037 struct snd_pcm_hw_rule *rule)
1038 {
1039 struct snd_usb_substream *subs = rule->private;
1040 struct audioformat *fp;
1041 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1042 unsigned int rmin, rmax;
1043 int changed;
1044
1045 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1046 changed = 0;
1047 rmin = rmax = 0;
1048 list_for_each_entry(fp, &subs->fmt_list, list) {
1049 if (!hw_check_valid_format(subs, params, fp))
1050 continue;
1051 if (changed++) {
1052 if (rmin > fp->rate_min)
1053 rmin = fp->rate_min;
1054 if (rmax < fp->rate_max)
1055 rmax = fp->rate_max;
1056 } else {
1057 rmin = fp->rate_min;
1058 rmax = fp->rate_max;
1059 }
1060 }
1061
1062 if (!changed) {
1063 hwc_debug(" --> get empty\n");
1064 it->empty = 1;
1065 return -EINVAL;
1066 }
1067
1068 changed = 0;
1069 if (it->min < rmin) {
1070 it->min = rmin;
1071 it->openmin = 0;
1072 changed = 1;
1073 }
1074 if (it->max > rmax) {
1075 it->max = rmax;
1076 it->openmax = 0;
1077 changed = 1;
1078 }
1079 if (snd_interval_checkempty(it)) {
1080 it->empty = 1;
1081 return -EINVAL;
1082 }
1083 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1084 return changed;
1085 }
1086
1087
hw_rule_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1088 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1089 struct snd_pcm_hw_rule *rule)
1090 {
1091 struct snd_usb_substream *subs = rule->private;
1092 struct audioformat *fp;
1093 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1094 unsigned int rmin, rmax;
1095 int changed;
1096
1097 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1098 changed = 0;
1099 rmin = rmax = 0;
1100 list_for_each_entry(fp, &subs->fmt_list, list) {
1101 if (!hw_check_valid_format(subs, params, fp))
1102 continue;
1103 if (changed++) {
1104 if (rmin > fp->channels)
1105 rmin = fp->channels;
1106 if (rmax < fp->channels)
1107 rmax = fp->channels;
1108 } else {
1109 rmin = fp->channels;
1110 rmax = fp->channels;
1111 }
1112 }
1113
1114 if (!changed) {
1115 hwc_debug(" --> get empty\n");
1116 it->empty = 1;
1117 return -EINVAL;
1118 }
1119
1120 changed = 0;
1121 if (it->min < rmin) {
1122 it->min = rmin;
1123 it->openmin = 0;
1124 changed = 1;
1125 }
1126 if (it->max > rmax) {
1127 it->max = rmax;
1128 it->openmax = 0;
1129 changed = 1;
1130 }
1131 if (snd_interval_checkempty(it)) {
1132 it->empty = 1;
1133 return -EINVAL;
1134 }
1135 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1136 return changed;
1137 }
1138
hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1139 static int hw_rule_format(struct snd_pcm_hw_params *params,
1140 struct snd_pcm_hw_rule *rule)
1141 {
1142 struct snd_usb_substream *subs = rule->private;
1143 struct audioformat *fp;
1144 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1145 u64 fbits;
1146 u32 oldbits[2];
1147 int changed;
1148
1149 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1150 fbits = 0;
1151 list_for_each_entry(fp, &subs->fmt_list, list) {
1152 if (!hw_check_valid_format(subs, params, fp))
1153 continue;
1154 fbits |= fp->formats;
1155 }
1156
1157 oldbits[0] = fmt->bits[0];
1158 oldbits[1] = fmt->bits[1];
1159 fmt->bits[0] &= (u32)fbits;
1160 fmt->bits[1] &= (u32)(fbits >> 32);
1161 if (!fmt->bits[0] && !fmt->bits[1]) {
1162 hwc_debug(" --> get empty\n");
1163 return -EINVAL;
1164 }
1165 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1166 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1167 return changed;
1168 }
1169
hw_rule_period_time(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1170 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1171 struct snd_pcm_hw_rule *rule)
1172 {
1173 struct snd_usb_substream *subs = rule->private;
1174 struct audioformat *fp;
1175 struct snd_interval *it;
1176 unsigned char min_datainterval;
1177 unsigned int pmin;
1178 int changed;
1179
1180 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1181 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1182 min_datainterval = 0xff;
1183 list_for_each_entry(fp, &subs->fmt_list, list) {
1184 if (!hw_check_valid_format(subs, params, fp))
1185 continue;
1186 min_datainterval = min(min_datainterval, fp->datainterval);
1187 }
1188 if (min_datainterval == 0xff) {
1189 hwc_debug(" --> get empty\n");
1190 it->empty = 1;
1191 return -EINVAL;
1192 }
1193 pmin = 125 * (1 << min_datainterval);
1194 changed = 0;
1195 if (it->min < pmin) {
1196 it->min = pmin;
1197 it->openmin = 0;
1198 changed = 1;
1199 }
1200 if (snd_interval_checkempty(it)) {
1201 it->empty = 1;
1202 return -EINVAL;
1203 }
1204 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1205 return changed;
1206 }
1207
1208 /*
1209 * If the device supports unusual bit rates, does the request meet these?
1210 */
snd_usb_pcm_check_knot(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)1211 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1212 struct snd_usb_substream *subs)
1213 {
1214 struct audioformat *fp;
1215 int *rate_list;
1216 int count = 0, needs_knot = 0;
1217 int err;
1218
1219 kfree(subs->rate_list.list);
1220 subs->rate_list.list = NULL;
1221
1222 list_for_each_entry(fp, &subs->fmt_list, list) {
1223 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1224 return 0;
1225 count += fp->nr_rates;
1226 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1227 needs_knot = 1;
1228 }
1229 if (!needs_knot)
1230 return 0;
1231
1232 subs->rate_list.list = rate_list =
1233 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1234 if (!subs->rate_list.list)
1235 return -ENOMEM;
1236 subs->rate_list.count = count;
1237 subs->rate_list.mask = 0;
1238 count = 0;
1239 list_for_each_entry(fp, &subs->fmt_list, list) {
1240 int i;
1241 for (i = 0; i < fp->nr_rates; i++)
1242 rate_list[count++] = fp->rate_table[i];
1243 }
1244 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1245 &subs->rate_list);
1246 if (err < 0)
1247 return err;
1248
1249 return 0;
1250 }
1251
1252
1253 /*
1254 * set up the runtime hardware information.
1255 */
1256
setup_hw_info(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)1257 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1258 {
1259 struct audioformat *fp;
1260 unsigned int pt, ptmin;
1261 int param_period_time_if_needed;
1262 int err;
1263
1264 runtime->hw.formats = subs->formats;
1265
1266 runtime->hw.rate_min = 0x7fffffff;
1267 runtime->hw.rate_max = 0;
1268 runtime->hw.channels_min = 256;
1269 runtime->hw.channels_max = 0;
1270 runtime->hw.rates = 0;
1271 ptmin = UINT_MAX;
1272 /* check min/max rates and channels */
1273 list_for_each_entry(fp, &subs->fmt_list, list) {
1274 runtime->hw.rates |= fp->rates;
1275 if (runtime->hw.rate_min > fp->rate_min)
1276 runtime->hw.rate_min = fp->rate_min;
1277 if (runtime->hw.rate_max < fp->rate_max)
1278 runtime->hw.rate_max = fp->rate_max;
1279 if (runtime->hw.channels_min > fp->channels)
1280 runtime->hw.channels_min = fp->channels;
1281 if (runtime->hw.channels_max < fp->channels)
1282 runtime->hw.channels_max = fp->channels;
1283 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1284 /* FIXME: there might be more than one audio formats... */
1285 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1286 fp->frame_size;
1287 }
1288 pt = 125 * (1 << fp->datainterval);
1289 ptmin = min(ptmin, pt);
1290 }
1291
1292 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1293 if (subs->speed == USB_SPEED_FULL)
1294 /* full speed devices have fixed data packet interval */
1295 ptmin = 1000;
1296 if (ptmin == 1000)
1297 /* if period time doesn't go below 1 ms, no rules needed */
1298 param_period_time_if_needed = -1;
1299
1300 err = snd_pcm_hw_constraint_minmax(runtime,
1301 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1302 ptmin, UINT_MAX);
1303 if (err < 0)
1304 return err;
1305
1306 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1307 hw_rule_rate, subs,
1308 SNDRV_PCM_HW_PARAM_FORMAT,
1309 SNDRV_PCM_HW_PARAM_CHANNELS,
1310 param_period_time_if_needed,
1311 -1);
1312 if (err < 0)
1313 return err;
1314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1315 hw_rule_channels, subs,
1316 SNDRV_PCM_HW_PARAM_FORMAT,
1317 SNDRV_PCM_HW_PARAM_RATE,
1318 param_period_time_if_needed,
1319 -1);
1320 if (err < 0)
1321 return err;
1322 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1323 hw_rule_format, subs,
1324 SNDRV_PCM_HW_PARAM_RATE,
1325 SNDRV_PCM_HW_PARAM_CHANNELS,
1326 param_period_time_if_needed,
1327 -1);
1328 if (err < 0)
1329 return err;
1330 if (param_period_time_if_needed >= 0) {
1331 err = snd_pcm_hw_rule_add(runtime, 0,
1332 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1333 hw_rule_period_time, subs,
1334 SNDRV_PCM_HW_PARAM_FORMAT,
1335 SNDRV_PCM_HW_PARAM_CHANNELS,
1336 SNDRV_PCM_HW_PARAM_RATE,
1337 -1);
1338 if (err < 0)
1339 return err;
1340 }
1341 err = snd_usb_pcm_check_knot(runtime, subs);
1342 if (err < 0)
1343 return err;
1344
1345 return snd_usb_autoresume(subs->stream->chip);
1346 }
1347
snd_usb_pcm_open(struct snd_pcm_substream * substream)1348 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1349 {
1350 int direction = substream->stream;
1351 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1352 struct snd_pcm_runtime *runtime = substream->runtime;
1353 struct snd_usb_substream *subs = &as->substream[direction];
1354 int ret;
1355
1356 subs->interface = -1;
1357 subs->altset_idx = 0;
1358 runtime->hw = snd_usb_hardware;
1359 runtime->private_data = subs;
1360 subs->pcm_substream = substream;
1361 /* runtime PM is also done there */
1362
1363 /* initialize DSD/DOP context */
1364 subs->dsd_dop.byte_idx = 0;
1365 subs->dsd_dop.channel = 0;
1366 subs->dsd_dop.marker = 1;
1367
1368 ret = setup_hw_info(runtime, subs);
1369 if (ret == 0) {
1370 ret = snd_media_stream_init(subs, as->pcm, direction);
1371 if (ret)
1372 snd_usb_autosuspend(subs->stream->chip);
1373 }
1374 return ret;
1375 }
1376
snd_usb_pcm_close(struct snd_pcm_substream * substream)1377 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1378 {
1379 int direction = substream->stream;
1380 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1381 struct snd_usb_substream *subs = &as->substream[direction];
1382 int ret;
1383
1384 snd_media_stop_pipeline(subs);
1385
1386 if (!as->chip->keep_iface &&
1387 subs->interface >= 0 &&
1388 !snd_usb_lock_shutdown(subs->stream->chip)) {
1389 usb_set_interface(subs->dev, subs->interface, 0);
1390 subs->interface = -1;
1391 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1392 snd_usb_unlock_shutdown(subs->stream->chip);
1393 if (ret < 0)
1394 return ret;
1395 }
1396
1397 subs->pcm_substream = NULL;
1398 snd_usb_autosuspend(subs->stream->chip);
1399
1400 return 0;
1401 }
1402
1403 /* Since a URB can handle only a single linear buffer, we must use double
1404 * buffering when the data to be transferred overflows the buffer boundary.
1405 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1406 * for all URBs.
1407 */
retire_capture_urb(struct snd_usb_substream * subs,struct urb * urb)1408 static void retire_capture_urb(struct snd_usb_substream *subs,
1409 struct urb *urb)
1410 {
1411 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1412 unsigned int stride, frames, bytes, oldptr;
1413 int i, period_elapsed = 0;
1414 unsigned long flags;
1415 unsigned char *cp;
1416 int current_frame_number;
1417
1418 /* read frame number here, update pointer in critical section */
1419 current_frame_number = usb_get_current_frame_number(subs->dev);
1420
1421 stride = runtime->frame_bits >> 3;
1422
1423 for (i = 0; i < urb->number_of_packets; i++) {
1424 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1425 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1426 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1427 i, urb->iso_frame_desc[i].status);
1428 // continue;
1429 }
1430 bytes = urb->iso_frame_desc[i].actual_length;
1431 if (subs->stream_offset_adj > 0) {
1432 unsigned int adj = min(subs->stream_offset_adj, bytes);
1433 cp += adj;
1434 bytes -= adj;
1435 subs->stream_offset_adj -= adj;
1436 }
1437 frames = bytes / stride;
1438 if (!subs->txfr_quirk)
1439 bytes = frames * stride;
1440 if (bytes % (runtime->sample_bits >> 3) != 0) {
1441 int oldbytes = bytes;
1442 bytes = frames * stride;
1443 dev_warn_ratelimited(&subs->dev->dev,
1444 "Corrected urb data len. %d->%d\n",
1445 oldbytes, bytes);
1446 }
1447 /* update the current pointer */
1448 spin_lock_irqsave(&subs->lock, flags);
1449 oldptr = subs->hwptr_done;
1450 subs->hwptr_done += bytes;
1451 if (subs->hwptr_done >= runtime->buffer_size * stride)
1452 subs->hwptr_done -= runtime->buffer_size * stride;
1453 frames = (bytes + (oldptr % stride)) / stride;
1454 subs->transfer_done += frames;
1455 if (subs->transfer_done >= runtime->period_size) {
1456 subs->transfer_done -= runtime->period_size;
1457 period_elapsed = 1;
1458 }
1459 /* capture delay is by construction limited to one URB,
1460 * reset delays here
1461 */
1462 runtime->delay = subs->last_delay = 0;
1463
1464 /* realign last_frame_number */
1465 subs->last_frame_number = current_frame_number;
1466 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1467
1468 spin_unlock_irqrestore(&subs->lock, flags);
1469 /* copy a data chunk */
1470 if (oldptr + bytes > runtime->buffer_size * stride) {
1471 unsigned int bytes1 =
1472 runtime->buffer_size * stride - oldptr;
1473 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1474 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1475 } else {
1476 memcpy(runtime->dma_area + oldptr, cp, bytes);
1477 }
1478 }
1479
1480 if (period_elapsed)
1481 snd_pcm_period_elapsed(subs->pcm_substream);
1482 }
1483
fill_playback_urb_dsd_dop(struct snd_usb_substream * subs,struct urb * urb,unsigned int bytes)1484 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1485 struct urb *urb, unsigned int bytes)
1486 {
1487 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1488 unsigned int stride = runtime->frame_bits >> 3;
1489 unsigned int dst_idx = 0;
1490 unsigned int src_idx = subs->hwptr_done;
1491 unsigned int wrap = runtime->buffer_size * stride;
1492 u8 *dst = urb->transfer_buffer;
1493 u8 *src = runtime->dma_area;
1494 u8 marker[] = { 0x05, 0xfa };
1495
1496 /*
1497 * The DSP DOP format defines a way to transport DSD samples over
1498 * normal PCM data endpoints. It requires stuffing of marker bytes
1499 * (0x05 and 0xfa, alternating per sample frame), and then expects
1500 * 2 additional bytes of actual payload. The whole frame is stored
1501 * LSB.
1502 *
1503 * Hence, for a stereo transport, the buffer layout looks like this,
1504 * where L refers to left channel samples and R to right.
1505 *
1506 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1507 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1508 * .....
1509 *
1510 */
1511
1512 while (bytes--) {
1513 if (++subs->dsd_dop.byte_idx == 3) {
1514 /* frame boundary? */
1515 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1516 src_idx += 2;
1517 subs->dsd_dop.byte_idx = 0;
1518
1519 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1520 /* alternate the marker */
1521 subs->dsd_dop.marker++;
1522 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1523 subs->dsd_dop.channel = 0;
1524 }
1525 } else {
1526 /* stuff the DSD payload */
1527 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1528
1529 if (subs->cur_audiofmt->dsd_bitrev)
1530 dst[dst_idx++] = bitrev8(src[idx]);
1531 else
1532 dst[dst_idx++] = src[idx];
1533
1534 subs->hwptr_done++;
1535 }
1536 }
1537 if (subs->hwptr_done >= runtime->buffer_size * stride)
1538 subs->hwptr_done -= runtime->buffer_size * stride;
1539 }
1540
copy_to_urb(struct snd_usb_substream * subs,struct urb * urb,int offset,int stride,unsigned int bytes)1541 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1542 int offset, int stride, unsigned int bytes)
1543 {
1544 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1545
1546 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1547 /* err, the transferred area goes over buffer boundary. */
1548 unsigned int bytes1 =
1549 runtime->buffer_size * stride - subs->hwptr_done;
1550 memcpy(urb->transfer_buffer + offset,
1551 runtime->dma_area + subs->hwptr_done, bytes1);
1552 memcpy(urb->transfer_buffer + offset + bytes1,
1553 runtime->dma_area, bytes - bytes1);
1554 } else {
1555 memcpy(urb->transfer_buffer + offset,
1556 runtime->dma_area + subs->hwptr_done, bytes);
1557 }
1558 subs->hwptr_done += bytes;
1559 if (subs->hwptr_done >= runtime->buffer_size * stride)
1560 subs->hwptr_done -= runtime->buffer_size * stride;
1561 }
1562
copy_to_urb_quirk(struct snd_usb_substream * subs,struct urb * urb,int stride,unsigned int bytes)1563 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1564 struct urb *urb, int stride,
1565 unsigned int bytes)
1566 {
1567 __le32 packet_length;
1568 int i;
1569
1570 /* Put __le32 length descriptor at start of each packet. */
1571 for (i = 0; i < urb->number_of_packets; i++) {
1572 unsigned int length = urb->iso_frame_desc[i].length;
1573 unsigned int offset = urb->iso_frame_desc[i].offset;
1574
1575 packet_length = cpu_to_le32(length);
1576 offset += i * sizeof(packet_length);
1577 urb->iso_frame_desc[i].offset = offset;
1578 urb->iso_frame_desc[i].length += sizeof(packet_length);
1579 memcpy(urb->transfer_buffer + offset,
1580 &packet_length, sizeof(packet_length));
1581 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1582 stride, length);
1583 }
1584 /* Adjust transfer size accordingly. */
1585 bytes += urb->number_of_packets * sizeof(packet_length);
1586 return bytes;
1587 }
1588
prepare_playback_urb(struct snd_usb_substream * subs,struct urb * urb)1589 static void prepare_playback_urb(struct snd_usb_substream *subs,
1590 struct urb *urb)
1591 {
1592 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1593 struct snd_usb_endpoint *ep = subs->data_endpoint;
1594 struct snd_urb_ctx *ctx = urb->context;
1595 unsigned int counts, frames, bytes;
1596 int i, stride, period_elapsed = 0;
1597 unsigned long flags;
1598
1599 stride = runtime->frame_bits >> 3;
1600
1601 frames = 0;
1602 urb->number_of_packets = 0;
1603 spin_lock_irqsave(&subs->lock, flags);
1604 subs->frame_limit += ep->max_urb_frames;
1605 for (i = 0; i < ctx->packets; i++) {
1606 if (ctx->packet_size[i])
1607 counts = ctx->packet_size[i];
1608 else if (ep->sync_master)
1609 counts = snd_usb_endpoint_slave_next_packet_size(ep);
1610 else
1611 counts = snd_usb_endpoint_next_packet_size(ep);
1612
1613 /* set up descriptor */
1614 urb->iso_frame_desc[i].offset = frames * ep->stride;
1615 urb->iso_frame_desc[i].length = counts * ep->stride;
1616 frames += counts;
1617 urb->number_of_packets++;
1618 subs->transfer_done += counts;
1619 if (subs->transfer_done >= runtime->period_size) {
1620 subs->transfer_done -= runtime->period_size;
1621 subs->frame_limit = 0;
1622 period_elapsed = 1;
1623 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1624 if (subs->transfer_done > 0) {
1625 /* FIXME: fill-max mode is not
1626 * supported yet */
1627 frames -= subs->transfer_done;
1628 counts -= subs->transfer_done;
1629 urb->iso_frame_desc[i].length =
1630 counts * ep->stride;
1631 subs->transfer_done = 0;
1632 }
1633 i++;
1634 if (i < ctx->packets) {
1635 /* add a transfer delimiter */
1636 urb->iso_frame_desc[i].offset =
1637 frames * ep->stride;
1638 urb->iso_frame_desc[i].length = 0;
1639 urb->number_of_packets++;
1640 }
1641 break;
1642 }
1643 }
1644 /* finish at the period boundary or after enough frames */
1645 if ((period_elapsed ||
1646 subs->transfer_done >= subs->frame_limit) &&
1647 !snd_usb_endpoint_implicit_feedback_sink(ep))
1648 break;
1649 }
1650 bytes = frames * ep->stride;
1651
1652 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1653 subs->cur_audiofmt->dsd_dop)) {
1654 fill_playback_urb_dsd_dop(subs, urb, bytes);
1655 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1656 subs->cur_audiofmt->dsd_bitrev)) {
1657 /* bit-reverse the bytes */
1658 u8 *buf = urb->transfer_buffer;
1659 for (i = 0; i < bytes; i++) {
1660 int idx = (subs->hwptr_done + i)
1661 % (runtime->buffer_size * stride);
1662 buf[i] = bitrev8(runtime->dma_area[idx]);
1663 }
1664
1665 subs->hwptr_done += bytes;
1666 if (subs->hwptr_done >= runtime->buffer_size * stride)
1667 subs->hwptr_done -= runtime->buffer_size * stride;
1668 } else {
1669 /* usual PCM */
1670 if (!subs->tx_length_quirk)
1671 copy_to_urb(subs, urb, 0, stride, bytes);
1672 else
1673 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1674 /* bytes is now amount of outgoing data */
1675 }
1676
1677 /* update delay with exact number of samples queued */
1678 runtime->delay = subs->last_delay;
1679 runtime->delay += frames;
1680 subs->last_delay = runtime->delay;
1681
1682 /* realign last_frame_number */
1683 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1684 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1685
1686 if (subs->trigger_tstamp_pending_update) {
1687 /* this is the first actual URB submitted,
1688 * update trigger timestamp to reflect actual start time
1689 */
1690 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1691 subs->trigger_tstamp_pending_update = false;
1692 }
1693
1694 spin_unlock_irqrestore(&subs->lock, flags);
1695 urb->transfer_buffer_length = bytes;
1696 if (period_elapsed)
1697 snd_pcm_period_elapsed(subs->pcm_substream);
1698 }
1699
1700 /*
1701 * process after playback data complete
1702 * - decrease the delay count again
1703 */
retire_playback_urb(struct snd_usb_substream * subs,struct urb * urb)1704 static void retire_playback_urb(struct snd_usb_substream *subs,
1705 struct urb *urb)
1706 {
1707 unsigned long flags;
1708 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1709 struct snd_usb_endpoint *ep = subs->data_endpoint;
1710 int processed = urb->transfer_buffer_length / ep->stride;
1711 int est_delay;
1712
1713 /* ignore the delay accounting when processed=0 is given, i.e.
1714 * silent payloads are processed before handling the actual data
1715 */
1716 if (!processed)
1717 return;
1718
1719 spin_lock_irqsave(&subs->lock, flags);
1720 if (!subs->last_delay)
1721 goto out; /* short path */
1722
1723 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1724 /* update delay with exact number of samples played */
1725 if (processed > subs->last_delay)
1726 subs->last_delay = 0;
1727 else
1728 subs->last_delay -= processed;
1729 runtime->delay = subs->last_delay;
1730
1731 /*
1732 * Report when delay estimate is off by more than 2ms.
1733 * The error should be lower than 2ms since the estimate relies
1734 * on two reads of a counter updated every ms.
1735 */
1736 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1737 dev_dbg_ratelimited(&subs->dev->dev,
1738 "delay: estimated %d, actual %d\n",
1739 est_delay, subs->last_delay);
1740
1741 if (!subs->running) {
1742 /* update last_frame_number for delay counting here since
1743 * prepare_playback_urb won't be called during pause
1744 */
1745 subs->last_frame_number =
1746 usb_get_current_frame_number(subs->dev) & 0xff;
1747 }
1748
1749 out:
1750 spin_unlock_irqrestore(&subs->lock, flags);
1751 }
1752
snd_usb_substream_playback_trigger(struct snd_pcm_substream * substream,int cmd)1753 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1754 int cmd)
1755 {
1756 struct snd_usb_substream *subs = substream->runtime->private_data;
1757
1758 switch (cmd) {
1759 case SNDRV_PCM_TRIGGER_START:
1760 subs->trigger_tstamp_pending_update = true;
1761 fallthrough;
1762 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1763 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1764 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1765 subs->running = 1;
1766 return 0;
1767 case SNDRV_PCM_TRIGGER_STOP:
1768 stop_endpoints(subs);
1769 subs->running = 0;
1770 return 0;
1771 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1772 subs->data_endpoint->prepare_data_urb = NULL;
1773 /* keep retire_data_urb for delay calculation */
1774 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1775 subs->running = 0;
1776 return 0;
1777 case SNDRV_PCM_TRIGGER_SUSPEND:
1778 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1779 stop_endpoints(subs);
1780 subs->need_setup_fmt = true;
1781 return 0;
1782 }
1783 break;
1784 }
1785
1786 return -EINVAL;
1787 }
1788
snd_usb_substream_capture_trigger(struct snd_pcm_substream * substream,int cmd)1789 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1790 int cmd)
1791 {
1792 int err;
1793 struct snd_usb_substream *subs = substream->runtime->private_data;
1794
1795 switch (cmd) {
1796 case SNDRV_PCM_TRIGGER_START:
1797 err = start_endpoints(subs);
1798 if (err < 0)
1799 return err;
1800
1801 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1802 subs->running = 1;
1803 return 0;
1804 case SNDRV_PCM_TRIGGER_STOP:
1805 stop_endpoints(subs);
1806 subs->data_endpoint->retire_data_urb = NULL;
1807 subs->running = 0;
1808 return 0;
1809 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1810 subs->data_endpoint->retire_data_urb = NULL;
1811 subs->running = 0;
1812 return 0;
1813 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1814 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1815 subs->running = 1;
1816 return 0;
1817 case SNDRV_PCM_TRIGGER_SUSPEND:
1818 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1819 stop_endpoints(subs);
1820 subs->need_setup_fmt = true;
1821 return 0;
1822 }
1823 break;
1824 }
1825
1826 return -EINVAL;
1827 }
1828
1829 static const struct snd_pcm_ops snd_usb_playback_ops = {
1830 .open = snd_usb_pcm_open,
1831 .close = snd_usb_pcm_close,
1832 .hw_params = snd_usb_hw_params,
1833 .hw_free = snd_usb_hw_free,
1834 .prepare = snd_usb_pcm_prepare,
1835 .trigger = snd_usb_substream_playback_trigger,
1836 .sync_stop = snd_usb_pcm_sync_stop,
1837 .pointer = snd_usb_pcm_pointer,
1838 };
1839
1840 static const struct snd_pcm_ops snd_usb_capture_ops = {
1841 .open = snd_usb_pcm_open,
1842 .close = snd_usb_pcm_close,
1843 .hw_params = snd_usb_hw_params,
1844 .hw_free = snd_usb_hw_free,
1845 .prepare = snd_usb_pcm_prepare,
1846 .trigger = snd_usb_substream_capture_trigger,
1847 .sync_stop = snd_usb_pcm_sync_stop,
1848 .pointer = snd_usb_pcm_pointer,
1849 };
1850
snd_usb_set_pcm_ops(struct snd_pcm * pcm,int stream)1851 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1852 {
1853 const struct snd_pcm_ops *ops;
1854
1855 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1856 &snd_usb_playback_ops : &snd_usb_capture_ops;
1857 snd_pcm_set_ops(pcm, stream, ops);
1858 }
1859
snd_usb_preallocate_buffer(struct snd_usb_substream * subs)1860 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1861 {
1862 struct snd_pcm *pcm = subs->stream->pcm;
1863 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1864 struct device *dev = subs->dev->bus->controller;
1865
1866 if (snd_usb_use_vmalloc)
1867 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1868 NULL, 0, 0);
1869 else
1870 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1871 dev, 64*1024, 512*1024);
1872 }
1873