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 sync_pending_stops(subs);
284 return 0;
285 }
286
search_roland_implicit_fb(struct usb_device * dev,int ifnum,unsigned int altsetting,struct usb_host_interface ** alts,unsigned int * ep)287 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
288 unsigned int altsetting,
289 struct usb_host_interface **alts,
290 unsigned int *ep)
291 {
292 struct usb_interface *iface;
293 struct usb_interface_descriptor *altsd;
294 struct usb_endpoint_descriptor *epd;
295
296 iface = usb_ifnum_to_if(dev, ifnum);
297 if (!iface || iface->num_altsetting < altsetting + 1)
298 return -ENOENT;
299 *alts = &iface->altsetting[altsetting];
300 altsd = get_iface_desc(*alts);
301 if (altsd->bAlternateSetting != altsetting ||
302 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
303 (altsd->bInterfaceSubClass != 2 &&
304 altsd->bInterfaceProtocol != 2 ) ||
305 altsd->bNumEndpoints < 1)
306 return -ENOENT;
307 epd = get_endpoint(*alts, 0);
308 if (!usb_endpoint_is_isoc_in(epd) ||
309 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
310 USB_ENDPOINT_USAGE_IMPLICIT_FB)
311 return -ENOENT;
312 *ep = epd->bEndpointAddress;
313 return 0;
314 }
315
316 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
317 * applies. Returns 1 if a quirk was found.
318 */
set_sync_ep_implicit_fb_quirk(struct snd_usb_substream * subs,struct usb_device * dev,struct usb_interface_descriptor * altsd,unsigned int attr)319 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
320 struct usb_device *dev,
321 struct usb_interface_descriptor *altsd,
322 unsigned int attr)
323 {
324 struct usb_host_interface *alts;
325 struct usb_interface *iface;
326 unsigned int ep;
327 unsigned int ifnum;
328
329 /* Implicit feedback sync EPs consumers are always playback EPs */
330 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
331 return 0;
332
333 switch (subs->stream->chip->usb_id) {
334 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
335 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
336 case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
337 ep = 0x81;
338 ifnum = 3;
339 goto add_sync_ep_from_ifnum;
340 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
341 case USB_ID(0x0763, 0x2081):
342 ep = 0x81;
343 ifnum = 2;
344 goto add_sync_ep_from_ifnum;
345 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
346 case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
347 ep = 0x86;
348 ifnum = 2;
349 goto add_sync_ep_from_ifnum;
350 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
351 ep = 0x81;
352 ifnum = 2;
353 goto add_sync_ep_from_ifnum;
354 case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
355 ep = 0x82;
356 ifnum = 2;
357 goto add_sync_ep_from_ifnum;
358 case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
359 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
360 ep = 0x81;
361 ifnum = 1;
362 goto add_sync_ep_from_ifnum;
363 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
364 /* MicroBook IIc */
365 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
366 return 0;
367
368 /* MicroBook II */
369 ep = 0x84;
370 ifnum = 0;
371 goto add_sync_ep_from_ifnum;
372 case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
373 case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
374 case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
375 case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
376 case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
377 ep = 0x81;
378 ifnum = 2;
379 goto add_sync_ep_from_ifnum;
380 case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
381 case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
382 ep = 0x82;
383 ifnum = 0;
384 goto add_sync_ep_from_ifnum;
385 case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
386 /* BOSS Katana amplifiers do not need quirks */
387 return 0;
388 }
389
390 if (attr == USB_ENDPOINT_SYNC_ASYNC &&
391 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
392 altsd->bInterfaceProtocol == 2 &&
393 altsd->bNumEndpoints == 1 &&
394 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
395 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
396 altsd->bAlternateSetting,
397 &alts, &ep) >= 0) {
398 goto add_sync_ep;
399 }
400
401 /* No quirk */
402 return 0;
403
404 add_sync_ep_from_ifnum:
405 iface = usb_ifnum_to_if(dev, ifnum);
406
407 if (!iface || iface->num_altsetting < 2)
408 return -EINVAL;
409
410 alts = &iface->altsetting[1];
411
412 add_sync_ep:
413 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
414 alts, ep, !subs->direction,
415 SND_USB_ENDPOINT_TYPE_DATA);
416 if (!subs->sync_endpoint)
417 return -EINVAL;
418
419 subs->sync_endpoint->is_implicit_feedback = 1;
420
421 subs->data_endpoint->sync_master = subs->sync_endpoint;
422
423 return 1;
424 }
425
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)426 static int set_sync_endpoint(struct snd_usb_substream *subs,
427 struct audioformat *fmt,
428 struct usb_device *dev,
429 struct usb_host_interface *alts,
430 struct usb_interface_descriptor *altsd)
431 {
432 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
433 unsigned int ep, attr;
434 bool implicit_fb;
435 int err;
436
437 /* we need a sync pipe in async OUT or adaptive IN mode */
438 /* check the number of EP, since some devices have broken
439 * descriptors which fool us. if it has only one EP,
440 * assume it as adaptive-out or sync-in.
441 */
442 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
443
444 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
445 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
446
447 /*
448 * In these modes the notion of sync_endpoint is irrelevant.
449 * Reset pointers to avoid using stale data from previously
450 * used settings, e.g. when configuration and endpoints were
451 * changed
452 */
453
454 subs->sync_endpoint = NULL;
455 subs->data_endpoint->sync_master = NULL;
456 }
457
458 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
459 if (err < 0)
460 return err;
461
462 /* endpoint set by quirk */
463 if (err > 0)
464 return 0;
465
466 if (altsd->bNumEndpoints < 2)
467 return 0;
468
469 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
470 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
471 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
472 return 0;
473
474 /*
475 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
476 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
477 * error fall back to SYNC mode and don't create sync endpoint
478 */
479
480 /* check sync-pipe endpoint */
481 /* ... and check descriptor size before accessing bSynchAddress
482 because there is a version of the SB Audigy 2 NX firmware lacking
483 the audio fields in the endpoint descriptors */
484 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
485 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
486 get_endpoint(alts, 1)->bSynchAddress != 0)) {
487 dev_err(&dev->dev,
488 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
489 fmt->iface, fmt->altsetting,
490 get_endpoint(alts, 1)->bmAttributes,
491 get_endpoint(alts, 1)->bLength,
492 get_endpoint(alts, 1)->bSynchAddress);
493 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
494 return 0;
495 return -EINVAL;
496 }
497 ep = get_endpoint(alts, 1)->bEndpointAddress;
498 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
499 get_endpoint(alts, 0)->bSynchAddress != 0 &&
500 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
501 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
502 dev_err(&dev->dev,
503 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
504 fmt->iface, fmt->altsetting,
505 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
506 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
507 return 0;
508 return -EINVAL;
509 }
510
511 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
512 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
513
514 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
515 alts, ep, !subs->direction,
516 implicit_fb ?
517 SND_USB_ENDPOINT_TYPE_DATA :
518 SND_USB_ENDPOINT_TYPE_SYNC);
519
520 if (!subs->sync_endpoint) {
521 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
522 return 0;
523 return -EINVAL;
524 }
525
526 subs->sync_endpoint->is_implicit_feedback = implicit_fb;
527
528 subs->data_endpoint->sync_master = subs->sync_endpoint;
529
530 return 0;
531 }
532
533 /*
534 * find a matching format and set up the interface
535 */
set_format(struct snd_usb_substream * subs,struct audioformat * fmt)536 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
537 {
538 struct usb_device *dev = subs->dev;
539 struct usb_host_interface *alts;
540 struct usb_interface_descriptor *altsd;
541 struct usb_interface *iface;
542 int err;
543
544 iface = usb_ifnum_to_if(dev, fmt->iface);
545 if (WARN_ON(!iface))
546 return -EINVAL;
547 alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
548 if (WARN_ON(!alts))
549 return -EINVAL;
550 altsd = get_iface_desc(alts);
551
552 if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
553 return 0;
554
555 /* close the old interface */
556 if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
557 if (!subs->stream->chip->keep_iface) {
558 err = usb_set_interface(subs->dev, subs->interface, 0);
559 if (err < 0) {
560 dev_err(&dev->dev,
561 "%d:%d: return to setting 0 failed (%d)\n",
562 fmt->iface, fmt->altsetting, err);
563 return -EIO;
564 }
565 }
566 subs->interface = -1;
567 subs->altset_idx = 0;
568 }
569
570 if (subs->need_setup_fmt)
571 subs->need_setup_fmt = false;
572
573 /* set interface */
574 if (iface->cur_altsetting != alts) {
575 err = snd_usb_select_mode_quirk(subs, fmt);
576 if (err < 0)
577 return -EIO;
578
579 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
580 if (err < 0) {
581 dev_err(&dev->dev,
582 "%d:%d: usb_set_interface failed (%d)\n",
583 fmt->iface, fmt->altsetting, err);
584 return -EIO;
585 }
586 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
587 fmt->iface, fmt->altsetting);
588 snd_usb_set_interface_quirk(dev);
589 }
590
591 subs->interface = fmt->iface;
592 subs->altset_idx = fmt->altset_idx;
593 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
594 alts, fmt->endpoint, subs->direction,
595 SND_USB_ENDPOINT_TYPE_DATA);
596
597 if (!subs->data_endpoint)
598 return -EINVAL;
599
600 err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
601 if (err < 0)
602 return err;
603
604 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
605 if (err < 0)
606 return err;
607
608 subs->cur_audiofmt = fmt;
609
610 snd_usb_set_format_quirk(subs, fmt);
611
612 return 0;
613 }
614
615 /*
616 * Return the score of matching two audioformats.
617 * Veto the audioformat if:
618 * - It has no channels for some reason.
619 * - Requested PCM format is not supported.
620 * - Requested sample rate is not supported.
621 */
match_endpoint_audioformats(struct snd_usb_substream * subs,struct audioformat * fp,struct audioformat * match,int rate,snd_pcm_format_t pcm_format)622 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
623 struct audioformat *fp,
624 struct audioformat *match, int rate,
625 snd_pcm_format_t pcm_format)
626 {
627 int i;
628 int score = 0;
629
630 if (fp->channels < 1) {
631 dev_dbg(&subs->dev->dev,
632 "%s: (fmt @%p) no channels\n", __func__, fp);
633 return 0;
634 }
635
636 if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
637 dev_dbg(&subs->dev->dev,
638 "%s: (fmt @%p) no match for format %d\n", __func__,
639 fp, pcm_format);
640 return 0;
641 }
642
643 for (i = 0; i < fp->nr_rates; i++) {
644 if (fp->rate_table[i] == rate) {
645 score++;
646 break;
647 }
648 }
649 if (!score) {
650 dev_dbg(&subs->dev->dev,
651 "%s: (fmt @%p) no match for rate %d\n", __func__,
652 fp, rate);
653 return 0;
654 }
655
656 if (fp->channels == match->channels)
657 score++;
658
659 dev_dbg(&subs->dev->dev,
660 "%s: (fmt @%p) score %d\n", __func__, fp, score);
661
662 return score;
663 }
664
665 /*
666 * Configure the sync ep using the rate and pcm format of the data ep.
667 */
configure_sync_endpoint(struct snd_usb_substream * subs)668 static int configure_sync_endpoint(struct snd_usb_substream *subs)
669 {
670 int ret;
671 struct audioformat *fp;
672 struct audioformat *sync_fp = NULL;
673 int cur_score = 0;
674 int sync_period_bytes = subs->period_bytes;
675 struct snd_usb_substream *sync_subs =
676 &subs->stream->substream[subs->direction ^ 1];
677
678 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
679 !subs->stream)
680 return snd_usb_endpoint_set_params(subs->sync_endpoint,
681 subs->pcm_format,
682 subs->channels,
683 subs->period_bytes,
684 0, 0,
685 subs->cur_rate,
686 subs->cur_audiofmt,
687 NULL);
688
689 /* Try to find the best matching audioformat. */
690 list_for_each_entry(fp, &sync_subs->fmt_list, list) {
691 int score = match_endpoint_audioformats(subs,
692 fp, subs->cur_audiofmt,
693 subs->cur_rate, subs->pcm_format);
694
695 if (score > cur_score) {
696 sync_fp = fp;
697 cur_score = score;
698 }
699 }
700
701 if (unlikely(sync_fp == NULL)) {
702 dev_err(&subs->dev->dev,
703 "%s: no valid audioformat for sync ep %x found\n",
704 __func__, sync_subs->ep_num);
705 return -EINVAL;
706 }
707
708 /*
709 * Recalculate the period bytes if channel number differ between
710 * data and sync ep audioformat.
711 */
712 if (sync_fp->channels != subs->channels) {
713 sync_period_bytes = (subs->period_bytes / subs->channels) *
714 sync_fp->channels;
715 dev_dbg(&subs->dev->dev,
716 "%s: adjusted sync ep period bytes (%d -> %d)\n",
717 __func__, subs->period_bytes, sync_period_bytes);
718 }
719
720 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
721 subs->pcm_format,
722 sync_fp->channels,
723 sync_period_bytes,
724 0, 0,
725 subs->cur_rate,
726 sync_fp,
727 NULL);
728
729 return ret;
730 }
731
732 /*
733 * configure endpoint params
734 *
735 * called during initial setup and upon resume
736 */
configure_endpoint(struct snd_usb_substream * subs)737 static int configure_endpoint(struct snd_usb_substream *subs)
738 {
739 int ret;
740
741 /* format changed */
742 stop_endpoints(subs);
743 sync_pending_stops(subs);
744 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
745 subs->pcm_format,
746 subs->channels,
747 subs->period_bytes,
748 subs->period_frames,
749 subs->buffer_periods,
750 subs->cur_rate,
751 subs->cur_audiofmt,
752 subs->sync_endpoint);
753 if (ret < 0)
754 return ret;
755
756 if (subs->sync_endpoint)
757 ret = configure_sync_endpoint(subs);
758
759 return ret;
760 }
761
snd_usb_pcm_change_state(struct snd_usb_substream * subs,int state)762 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
763 {
764 int ret;
765
766 if (!subs->str_pd)
767 return 0;
768
769 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
770 if (ret < 0) {
771 dev_err(&subs->dev->dev,
772 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
773 subs->str_pd->pd_id, state, ret);
774 return ret;
775 }
776
777 return 0;
778 }
779
snd_usb_pcm_suspend(struct snd_usb_stream * as)780 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
781 {
782 int ret;
783
784 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
785 if (ret < 0)
786 return ret;
787
788 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
789 if (ret < 0)
790 return ret;
791
792 return 0;
793 }
794
snd_usb_pcm_resume(struct snd_usb_stream * as)795 int snd_usb_pcm_resume(struct snd_usb_stream *as)
796 {
797 int ret;
798
799 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
800 if (ret < 0)
801 return ret;
802
803 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
804 if (ret < 0)
805 return ret;
806
807 return 0;
808 }
809
810 /*
811 * hw_params callback
812 *
813 * allocate a buffer and set the given audio format.
814 *
815 * so far we use a physically linear buffer although packetize transfer
816 * doesn't need a continuous area.
817 * if sg buffer is supported on the later version of alsa, we'll follow
818 * that.
819 */
snd_usb_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)820 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
821 struct snd_pcm_hw_params *hw_params)
822 {
823 struct snd_usb_substream *subs = substream->runtime->private_data;
824 struct audioformat *fmt;
825 int ret;
826
827 ret = snd_media_start_pipeline(subs);
828 if (ret)
829 return ret;
830
831 subs->pcm_format = params_format(hw_params);
832 subs->period_bytes = params_period_bytes(hw_params);
833 subs->period_frames = params_period_size(hw_params);
834 subs->buffer_periods = params_periods(hw_params);
835 subs->channels = params_channels(hw_params);
836 subs->cur_rate = params_rate(hw_params);
837
838 fmt = find_format(subs);
839 if (!fmt) {
840 dev_dbg(&subs->dev->dev,
841 "cannot set format: format = %#x, rate = %d, channels = %d\n",
842 subs->pcm_format, subs->cur_rate, subs->channels);
843 ret = -EINVAL;
844 goto stop_pipeline;
845 }
846
847 ret = snd_usb_lock_shutdown(subs->stream->chip);
848 if (ret < 0)
849 goto stop_pipeline;
850
851 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
852 if (ret < 0)
853 goto unlock;
854
855 ret = set_format(subs, fmt);
856 if (ret < 0)
857 goto unlock;
858
859 subs->interface = fmt->iface;
860 subs->altset_idx = fmt->altset_idx;
861 subs->need_setup_ep = true;
862
863 unlock:
864 snd_usb_unlock_shutdown(subs->stream->chip);
865 if (ret < 0)
866 goto stop_pipeline;
867 return ret;
868
869 stop_pipeline:
870 snd_media_stop_pipeline(subs);
871 return ret;
872 }
873
874 /*
875 * hw_free callback
876 *
877 * reset the audio format and release the buffer
878 */
snd_usb_hw_free(struct snd_pcm_substream * substream)879 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
880 {
881 struct snd_usb_substream *subs = substream->runtime->private_data;
882
883 snd_media_stop_pipeline(subs);
884 subs->cur_audiofmt = NULL;
885 subs->cur_rate = 0;
886 subs->period_bytes = 0;
887 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
888 stop_endpoints(subs);
889 sync_pending_stops(subs);
890 snd_usb_endpoint_deactivate(subs->sync_endpoint);
891 snd_usb_endpoint_deactivate(subs->data_endpoint);
892 snd_usb_unlock_shutdown(subs->stream->chip);
893 }
894
895 return 0;
896 }
897
898 /*
899 * prepare callback
900 *
901 * only a few subtle things...
902 */
snd_usb_pcm_prepare(struct snd_pcm_substream * substream)903 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
904 {
905 struct snd_pcm_runtime *runtime = substream->runtime;
906 struct snd_usb_substream *subs = runtime->private_data;
907 struct usb_host_interface *alts;
908 struct usb_interface *iface;
909 int ret;
910
911 if (! subs->cur_audiofmt) {
912 dev_err(&subs->dev->dev, "no format is specified!\n");
913 return -ENXIO;
914 }
915
916 ret = snd_usb_lock_shutdown(subs->stream->chip);
917 if (ret < 0)
918 return ret;
919 if (snd_BUG_ON(!subs->data_endpoint)) {
920 ret = -EIO;
921 goto unlock;
922 }
923
924 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
925 if (ret < 0)
926 goto unlock;
927
928 ret = set_format(subs, subs->cur_audiofmt);
929 if (ret < 0)
930 goto unlock;
931
932 if (subs->need_setup_ep) {
933
934 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
935 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
936 ret = snd_usb_init_sample_rate(subs->stream->chip,
937 subs->cur_audiofmt->iface,
938 alts,
939 subs->cur_audiofmt,
940 subs->cur_rate);
941 if (ret < 0)
942 goto unlock;
943
944 ret = configure_endpoint(subs);
945 if (ret < 0)
946 goto unlock;
947 subs->need_setup_ep = false;
948 }
949
950 /* some unit conversions in runtime */
951 subs->data_endpoint->maxframesize =
952 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
953 subs->data_endpoint->curframesize =
954 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
955
956 /* reset the pointer */
957 subs->hwptr_done = 0;
958 subs->transfer_done = 0;
959 subs->last_delay = 0;
960 subs->last_frame_number = 0;
961 runtime->delay = 0;
962
963 /* for playback, submit the URBs now; otherwise, the first hwptr_done
964 * updates for all URBs would happen at the same time when starting */
965 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
966 ret = start_endpoints(subs);
967
968 unlock:
969 snd_usb_unlock_shutdown(subs->stream->chip);
970 return ret;
971 }
972
973 static const struct snd_pcm_hardware snd_usb_hardware =
974 {
975 .info = SNDRV_PCM_INFO_MMAP |
976 SNDRV_PCM_INFO_MMAP_VALID |
977 SNDRV_PCM_INFO_BATCH |
978 SNDRV_PCM_INFO_INTERLEAVED |
979 SNDRV_PCM_INFO_BLOCK_TRANSFER |
980 SNDRV_PCM_INFO_PAUSE,
981 .buffer_bytes_max = 1024 * 1024,
982 .period_bytes_min = 64,
983 .period_bytes_max = 512 * 1024,
984 .periods_min = 2,
985 .periods_max = 1024,
986 };
987
hw_check_valid_format(struct snd_usb_substream * subs,struct snd_pcm_hw_params * params,struct audioformat * fp)988 static int hw_check_valid_format(struct snd_usb_substream *subs,
989 struct snd_pcm_hw_params *params,
990 struct audioformat *fp)
991 {
992 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
993 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
994 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
995 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
996 struct snd_mask check_fmts;
997 unsigned int ptime;
998
999 /* check the format */
1000 snd_mask_none(&check_fmts);
1001 check_fmts.bits[0] = (u32)fp->formats;
1002 check_fmts.bits[1] = (u32)(fp->formats >> 32);
1003 snd_mask_intersect(&check_fmts, fmts);
1004 if (snd_mask_empty(&check_fmts)) {
1005 hwc_debug(" > check: no supported format %d\n", fp->format);
1006 return 0;
1007 }
1008 /* check the channels */
1009 if (fp->channels < ct->min || fp->channels > ct->max) {
1010 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1011 return 0;
1012 }
1013 /* check the rate is within the range */
1014 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1015 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1016 return 0;
1017 }
1018 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1019 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1020 return 0;
1021 }
1022 /* check whether the period time is >= the data packet interval */
1023 if (subs->speed != USB_SPEED_FULL) {
1024 ptime = 125 * (1 << fp->datainterval);
1025 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1026 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
1027 return 0;
1028 }
1029 }
1030 return 1;
1031 }
1032
hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1033 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1034 struct snd_pcm_hw_rule *rule)
1035 {
1036 struct snd_usb_substream *subs = rule->private;
1037 struct audioformat *fp;
1038 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1039 unsigned int rmin, rmax;
1040 int changed;
1041
1042 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1043 changed = 0;
1044 rmin = rmax = 0;
1045 list_for_each_entry(fp, &subs->fmt_list, list) {
1046 if (!hw_check_valid_format(subs, params, fp))
1047 continue;
1048 if (changed++) {
1049 if (rmin > fp->rate_min)
1050 rmin = fp->rate_min;
1051 if (rmax < fp->rate_max)
1052 rmax = fp->rate_max;
1053 } else {
1054 rmin = fp->rate_min;
1055 rmax = fp->rate_max;
1056 }
1057 }
1058
1059 if (!changed) {
1060 hwc_debug(" --> get empty\n");
1061 it->empty = 1;
1062 return -EINVAL;
1063 }
1064
1065 changed = 0;
1066 if (it->min < rmin) {
1067 it->min = rmin;
1068 it->openmin = 0;
1069 changed = 1;
1070 }
1071 if (it->max > rmax) {
1072 it->max = rmax;
1073 it->openmax = 0;
1074 changed = 1;
1075 }
1076 if (snd_interval_checkempty(it)) {
1077 it->empty = 1;
1078 return -EINVAL;
1079 }
1080 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1081 return changed;
1082 }
1083
1084
hw_rule_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1085 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1086 struct snd_pcm_hw_rule *rule)
1087 {
1088 struct snd_usb_substream *subs = rule->private;
1089 struct audioformat *fp;
1090 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1091 unsigned int rmin, rmax;
1092 int changed;
1093
1094 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1095 changed = 0;
1096 rmin = rmax = 0;
1097 list_for_each_entry(fp, &subs->fmt_list, list) {
1098 if (!hw_check_valid_format(subs, params, fp))
1099 continue;
1100 if (changed++) {
1101 if (rmin > fp->channels)
1102 rmin = fp->channels;
1103 if (rmax < fp->channels)
1104 rmax = fp->channels;
1105 } else {
1106 rmin = fp->channels;
1107 rmax = fp->channels;
1108 }
1109 }
1110
1111 if (!changed) {
1112 hwc_debug(" --> get empty\n");
1113 it->empty = 1;
1114 return -EINVAL;
1115 }
1116
1117 changed = 0;
1118 if (it->min < rmin) {
1119 it->min = rmin;
1120 it->openmin = 0;
1121 changed = 1;
1122 }
1123 if (it->max > rmax) {
1124 it->max = rmax;
1125 it->openmax = 0;
1126 changed = 1;
1127 }
1128 if (snd_interval_checkempty(it)) {
1129 it->empty = 1;
1130 return -EINVAL;
1131 }
1132 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1133 return changed;
1134 }
1135
hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1136 static int hw_rule_format(struct snd_pcm_hw_params *params,
1137 struct snd_pcm_hw_rule *rule)
1138 {
1139 struct snd_usb_substream *subs = rule->private;
1140 struct audioformat *fp;
1141 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1142 u64 fbits;
1143 u32 oldbits[2];
1144 int changed;
1145
1146 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1147 fbits = 0;
1148 list_for_each_entry(fp, &subs->fmt_list, list) {
1149 if (!hw_check_valid_format(subs, params, fp))
1150 continue;
1151 fbits |= fp->formats;
1152 }
1153
1154 oldbits[0] = fmt->bits[0];
1155 oldbits[1] = fmt->bits[1];
1156 fmt->bits[0] &= (u32)fbits;
1157 fmt->bits[1] &= (u32)(fbits >> 32);
1158 if (!fmt->bits[0] && !fmt->bits[1]) {
1159 hwc_debug(" --> get empty\n");
1160 return -EINVAL;
1161 }
1162 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1163 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1164 return changed;
1165 }
1166
hw_rule_period_time(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1167 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1168 struct snd_pcm_hw_rule *rule)
1169 {
1170 struct snd_usb_substream *subs = rule->private;
1171 struct audioformat *fp;
1172 struct snd_interval *it;
1173 unsigned char min_datainterval;
1174 unsigned int pmin;
1175 int changed;
1176
1177 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1178 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1179 min_datainterval = 0xff;
1180 list_for_each_entry(fp, &subs->fmt_list, list) {
1181 if (!hw_check_valid_format(subs, params, fp))
1182 continue;
1183 min_datainterval = min(min_datainterval, fp->datainterval);
1184 }
1185 if (min_datainterval == 0xff) {
1186 hwc_debug(" --> get empty\n");
1187 it->empty = 1;
1188 return -EINVAL;
1189 }
1190 pmin = 125 * (1 << min_datainterval);
1191 changed = 0;
1192 if (it->min < pmin) {
1193 it->min = pmin;
1194 it->openmin = 0;
1195 changed = 1;
1196 }
1197 if (snd_interval_checkempty(it)) {
1198 it->empty = 1;
1199 return -EINVAL;
1200 }
1201 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1202 return changed;
1203 }
1204
1205 /*
1206 * If the device supports unusual bit rates, does the request meet these?
1207 */
snd_usb_pcm_check_knot(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)1208 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1209 struct snd_usb_substream *subs)
1210 {
1211 struct audioformat *fp;
1212 int *rate_list;
1213 int count = 0, needs_knot = 0;
1214 int err;
1215
1216 kfree(subs->rate_list.list);
1217 subs->rate_list.list = NULL;
1218
1219 list_for_each_entry(fp, &subs->fmt_list, list) {
1220 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1221 return 0;
1222 count += fp->nr_rates;
1223 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1224 needs_knot = 1;
1225 }
1226 if (!needs_knot)
1227 return 0;
1228
1229 subs->rate_list.list = rate_list =
1230 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1231 if (!subs->rate_list.list)
1232 return -ENOMEM;
1233 subs->rate_list.count = count;
1234 subs->rate_list.mask = 0;
1235 count = 0;
1236 list_for_each_entry(fp, &subs->fmt_list, list) {
1237 int i;
1238 for (i = 0; i < fp->nr_rates; i++)
1239 rate_list[count++] = fp->rate_table[i];
1240 }
1241 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1242 &subs->rate_list);
1243 if (err < 0)
1244 return err;
1245
1246 return 0;
1247 }
1248
1249
1250 /*
1251 * set up the runtime hardware information.
1252 */
1253
setup_hw_info(struct snd_pcm_runtime * runtime,struct snd_usb_substream * subs)1254 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1255 {
1256 struct audioformat *fp;
1257 unsigned int pt, ptmin;
1258 int param_period_time_if_needed;
1259 int err;
1260
1261 runtime->hw.formats = subs->formats;
1262
1263 runtime->hw.rate_min = 0x7fffffff;
1264 runtime->hw.rate_max = 0;
1265 runtime->hw.channels_min = 256;
1266 runtime->hw.channels_max = 0;
1267 runtime->hw.rates = 0;
1268 ptmin = UINT_MAX;
1269 /* check min/max rates and channels */
1270 list_for_each_entry(fp, &subs->fmt_list, list) {
1271 runtime->hw.rates |= fp->rates;
1272 if (runtime->hw.rate_min > fp->rate_min)
1273 runtime->hw.rate_min = fp->rate_min;
1274 if (runtime->hw.rate_max < fp->rate_max)
1275 runtime->hw.rate_max = fp->rate_max;
1276 if (runtime->hw.channels_min > fp->channels)
1277 runtime->hw.channels_min = fp->channels;
1278 if (runtime->hw.channels_max < fp->channels)
1279 runtime->hw.channels_max = fp->channels;
1280 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1281 /* FIXME: there might be more than one audio formats... */
1282 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1283 fp->frame_size;
1284 }
1285 pt = 125 * (1 << fp->datainterval);
1286 ptmin = min(ptmin, pt);
1287 }
1288
1289 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1290 if (subs->speed == USB_SPEED_FULL)
1291 /* full speed devices have fixed data packet interval */
1292 ptmin = 1000;
1293 if (ptmin == 1000)
1294 /* if period time doesn't go below 1 ms, no rules needed */
1295 param_period_time_if_needed = -1;
1296
1297 err = snd_pcm_hw_constraint_minmax(runtime,
1298 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1299 ptmin, UINT_MAX);
1300 if (err < 0)
1301 return err;
1302
1303 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1304 hw_rule_rate, subs,
1305 SNDRV_PCM_HW_PARAM_FORMAT,
1306 SNDRV_PCM_HW_PARAM_CHANNELS,
1307 param_period_time_if_needed,
1308 -1);
1309 if (err < 0)
1310 return err;
1311 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1312 hw_rule_channels, subs,
1313 SNDRV_PCM_HW_PARAM_FORMAT,
1314 SNDRV_PCM_HW_PARAM_RATE,
1315 param_period_time_if_needed,
1316 -1);
1317 if (err < 0)
1318 return err;
1319 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1320 hw_rule_format, subs,
1321 SNDRV_PCM_HW_PARAM_RATE,
1322 SNDRV_PCM_HW_PARAM_CHANNELS,
1323 param_period_time_if_needed,
1324 -1);
1325 if (err < 0)
1326 return err;
1327 if (param_period_time_if_needed >= 0) {
1328 err = snd_pcm_hw_rule_add(runtime, 0,
1329 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1330 hw_rule_period_time, subs,
1331 SNDRV_PCM_HW_PARAM_FORMAT,
1332 SNDRV_PCM_HW_PARAM_CHANNELS,
1333 SNDRV_PCM_HW_PARAM_RATE,
1334 -1);
1335 if (err < 0)
1336 return err;
1337 }
1338 err = snd_usb_pcm_check_knot(runtime, subs);
1339 if (err < 0)
1340 return err;
1341
1342 return snd_usb_autoresume(subs->stream->chip);
1343 }
1344
snd_usb_pcm_open(struct snd_pcm_substream * substream)1345 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1346 {
1347 int direction = substream->stream;
1348 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1349 struct snd_pcm_runtime *runtime = substream->runtime;
1350 struct snd_usb_substream *subs = &as->substream[direction];
1351 int ret;
1352
1353 subs->interface = -1;
1354 subs->altset_idx = 0;
1355 runtime->hw = snd_usb_hardware;
1356 runtime->private_data = subs;
1357 subs->pcm_substream = substream;
1358 /* runtime PM is also done there */
1359
1360 /* initialize DSD/DOP context */
1361 subs->dsd_dop.byte_idx = 0;
1362 subs->dsd_dop.channel = 0;
1363 subs->dsd_dop.marker = 1;
1364
1365 ret = setup_hw_info(runtime, subs);
1366 if (ret == 0) {
1367 ret = snd_media_stream_init(subs, as->pcm, direction);
1368 if (ret)
1369 snd_usb_autosuspend(subs->stream->chip);
1370 }
1371 return ret;
1372 }
1373
snd_usb_pcm_close(struct snd_pcm_substream * substream)1374 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1375 {
1376 int direction = substream->stream;
1377 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1378 struct snd_usb_substream *subs = &as->substream[direction];
1379 int ret;
1380
1381 snd_media_stop_pipeline(subs);
1382
1383 if (!as->chip->keep_iface &&
1384 subs->interface >= 0 &&
1385 !snd_usb_lock_shutdown(subs->stream->chip)) {
1386 usb_set_interface(subs->dev, subs->interface, 0);
1387 subs->interface = -1;
1388 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1389 snd_usb_unlock_shutdown(subs->stream->chip);
1390 if (ret < 0)
1391 return ret;
1392 }
1393
1394 subs->pcm_substream = NULL;
1395 snd_usb_autosuspend(subs->stream->chip);
1396
1397 return 0;
1398 }
1399
1400 /* Since a URB can handle only a single linear buffer, we must use double
1401 * buffering when the data to be transferred overflows the buffer boundary.
1402 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1403 * for all URBs.
1404 */
retire_capture_urb(struct snd_usb_substream * subs,struct urb * urb)1405 static void retire_capture_urb(struct snd_usb_substream *subs,
1406 struct urb *urb)
1407 {
1408 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1409 unsigned int stride, frames, bytes, oldptr;
1410 int i, period_elapsed = 0;
1411 unsigned long flags;
1412 unsigned char *cp;
1413 int current_frame_number;
1414
1415 /* read frame number here, update pointer in critical section */
1416 current_frame_number = usb_get_current_frame_number(subs->dev);
1417
1418 stride = runtime->frame_bits >> 3;
1419
1420 for (i = 0; i < urb->number_of_packets; i++) {
1421 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1422 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1423 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1424 i, urb->iso_frame_desc[i].status);
1425 // continue;
1426 }
1427 bytes = urb->iso_frame_desc[i].actual_length;
1428 if (subs->stream_offset_adj > 0) {
1429 unsigned int adj = min(subs->stream_offset_adj, bytes);
1430 cp += adj;
1431 bytes -= adj;
1432 subs->stream_offset_adj -= adj;
1433 }
1434 frames = bytes / stride;
1435 if (!subs->txfr_quirk)
1436 bytes = frames * stride;
1437 if (bytes % (runtime->sample_bits >> 3) != 0) {
1438 int oldbytes = bytes;
1439 bytes = frames * stride;
1440 dev_warn_ratelimited(&subs->dev->dev,
1441 "Corrected urb data len. %d->%d\n",
1442 oldbytes, bytes);
1443 }
1444 /* update the current pointer */
1445 spin_lock_irqsave(&subs->lock, flags);
1446 oldptr = subs->hwptr_done;
1447 subs->hwptr_done += bytes;
1448 if (subs->hwptr_done >= runtime->buffer_size * stride)
1449 subs->hwptr_done -= runtime->buffer_size * stride;
1450 frames = (bytes + (oldptr % stride)) / stride;
1451 subs->transfer_done += frames;
1452 if (subs->transfer_done >= runtime->period_size) {
1453 subs->transfer_done -= runtime->period_size;
1454 period_elapsed = 1;
1455 }
1456 /* capture delay is by construction limited to one URB,
1457 * reset delays here
1458 */
1459 runtime->delay = subs->last_delay = 0;
1460
1461 /* realign last_frame_number */
1462 subs->last_frame_number = current_frame_number;
1463 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1464
1465 spin_unlock_irqrestore(&subs->lock, flags);
1466 /* copy a data chunk */
1467 if (oldptr + bytes > runtime->buffer_size * stride) {
1468 unsigned int bytes1 =
1469 runtime->buffer_size * stride - oldptr;
1470 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1471 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1472 } else {
1473 memcpy(runtime->dma_area + oldptr, cp, bytes);
1474 }
1475 }
1476
1477 if (period_elapsed)
1478 snd_pcm_period_elapsed(subs->pcm_substream);
1479 }
1480
fill_playback_urb_dsd_dop(struct snd_usb_substream * subs,struct urb * urb,unsigned int bytes)1481 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1482 struct urb *urb, unsigned int bytes)
1483 {
1484 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1485 unsigned int stride = runtime->frame_bits >> 3;
1486 unsigned int dst_idx = 0;
1487 unsigned int src_idx = subs->hwptr_done;
1488 unsigned int wrap = runtime->buffer_size * stride;
1489 u8 *dst = urb->transfer_buffer;
1490 u8 *src = runtime->dma_area;
1491 u8 marker[] = { 0x05, 0xfa };
1492
1493 /*
1494 * The DSP DOP format defines a way to transport DSD samples over
1495 * normal PCM data endpoints. It requires stuffing of marker bytes
1496 * (0x05 and 0xfa, alternating per sample frame), and then expects
1497 * 2 additional bytes of actual payload. The whole frame is stored
1498 * LSB.
1499 *
1500 * Hence, for a stereo transport, the buffer layout looks like this,
1501 * where L refers to left channel samples and R to right.
1502 *
1503 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1504 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1505 * .....
1506 *
1507 */
1508
1509 while (bytes--) {
1510 if (++subs->dsd_dop.byte_idx == 3) {
1511 /* frame boundary? */
1512 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1513 src_idx += 2;
1514 subs->dsd_dop.byte_idx = 0;
1515
1516 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1517 /* alternate the marker */
1518 subs->dsd_dop.marker++;
1519 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1520 subs->dsd_dop.channel = 0;
1521 }
1522 } else {
1523 /* stuff the DSD payload */
1524 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1525
1526 if (subs->cur_audiofmt->dsd_bitrev)
1527 dst[dst_idx++] = bitrev8(src[idx]);
1528 else
1529 dst[dst_idx++] = src[idx];
1530
1531 subs->hwptr_done++;
1532 }
1533 }
1534 if (subs->hwptr_done >= runtime->buffer_size * stride)
1535 subs->hwptr_done -= runtime->buffer_size * stride;
1536 }
1537
copy_to_urb(struct snd_usb_substream * subs,struct urb * urb,int offset,int stride,unsigned int bytes)1538 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1539 int offset, int stride, unsigned int bytes)
1540 {
1541 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1542
1543 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1544 /* err, the transferred area goes over buffer boundary. */
1545 unsigned int bytes1 =
1546 runtime->buffer_size * stride - subs->hwptr_done;
1547 memcpy(urb->transfer_buffer + offset,
1548 runtime->dma_area + subs->hwptr_done, bytes1);
1549 memcpy(urb->transfer_buffer + offset + bytes1,
1550 runtime->dma_area, bytes - bytes1);
1551 } else {
1552 memcpy(urb->transfer_buffer + offset,
1553 runtime->dma_area + subs->hwptr_done, bytes);
1554 }
1555 subs->hwptr_done += bytes;
1556 if (subs->hwptr_done >= runtime->buffer_size * stride)
1557 subs->hwptr_done -= runtime->buffer_size * stride;
1558 }
1559
copy_to_urb_quirk(struct snd_usb_substream * subs,struct urb * urb,int stride,unsigned int bytes)1560 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1561 struct urb *urb, int stride,
1562 unsigned int bytes)
1563 {
1564 __le32 packet_length;
1565 int i;
1566
1567 /* Put __le32 length descriptor at start of each packet. */
1568 for (i = 0; i < urb->number_of_packets; i++) {
1569 unsigned int length = urb->iso_frame_desc[i].length;
1570 unsigned int offset = urb->iso_frame_desc[i].offset;
1571
1572 packet_length = cpu_to_le32(length);
1573 offset += i * sizeof(packet_length);
1574 urb->iso_frame_desc[i].offset = offset;
1575 urb->iso_frame_desc[i].length += sizeof(packet_length);
1576 memcpy(urb->transfer_buffer + offset,
1577 &packet_length, sizeof(packet_length));
1578 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1579 stride, length);
1580 }
1581 /* Adjust transfer size accordingly. */
1582 bytes += urb->number_of_packets * sizeof(packet_length);
1583 return bytes;
1584 }
1585
prepare_playback_urb(struct snd_usb_substream * subs,struct urb * urb)1586 static void prepare_playback_urb(struct snd_usb_substream *subs,
1587 struct urb *urb)
1588 {
1589 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1590 struct snd_usb_endpoint *ep = subs->data_endpoint;
1591 struct snd_urb_ctx *ctx = urb->context;
1592 unsigned int counts, frames, bytes;
1593 int i, stride, period_elapsed = 0;
1594 unsigned long flags;
1595
1596 stride = runtime->frame_bits >> 3;
1597
1598 frames = 0;
1599 urb->number_of_packets = 0;
1600 spin_lock_irqsave(&subs->lock, flags);
1601 subs->frame_limit += ep->max_urb_frames;
1602 for (i = 0; i < ctx->packets; i++) {
1603 if (ctx->packet_size[i])
1604 counts = ctx->packet_size[i];
1605 else if (ep->sync_master)
1606 counts = snd_usb_endpoint_slave_next_packet_size(ep);
1607 else
1608 counts = snd_usb_endpoint_next_packet_size(ep);
1609
1610 /* set up descriptor */
1611 urb->iso_frame_desc[i].offset = frames * ep->stride;
1612 urb->iso_frame_desc[i].length = counts * ep->stride;
1613 frames += counts;
1614 urb->number_of_packets++;
1615 subs->transfer_done += counts;
1616 if (subs->transfer_done >= runtime->period_size) {
1617 subs->transfer_done -= runtime->period_size;
1618 subs->frame_limit = 0;
1619 period_elapsed = 1;
1620 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1621 if (subs->transfer_done > 0) {
1622 /* FIXME: fill-max mode is not
1623 * supported yet */
1624 frames -= subs->transfer_done;
1625 counts -= subs->transfer_done;
1626 urb->iso_frame_desc[i].length =
1627 counts * ep->stride;
1628 subs->transfer_done = 0;
1629 }
1630 i++;
1631 if (i < ctx->packets) {
1632 /* add a transfer delimiter */
1633 urb->iso_frame_desc[i].offset =
1634 frames * ep->stride;
1635 urb->iso_frame_desc[i].length = 0;
1636 urb->number_of_packets++;
1637 }
1638 break;
1639 }
1640 }
1641 /* finish at the period boundary or after enough frames */
1642 if ((period_elapsed ||
1643 subs->transfer_done >= subs->frame_limit) &&
1644 !snd_usb_endpoint_implicit_feedback_sink(ep))
1645 break;
1646 }
1647 bytes = frames * ep->stride;
1648
1649 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1650 subs->cur_audiofmt->dsd_dop)) {
1651 fill_playback_urb_dsd_dop(subs, urb, bytes);
1652 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1653 subs->cur_audiofmt->dsd_bitrev)) {
1654 /* bit-reverse the bytes */
1655 u8 *buf = urb->transfer_buffer;
1656 for (i = 0; i < bytes; i++) {
1657 int idx = (subs->hwptr_done + i)
1658 % (runtime->buffer_size * stride);
1659 buf[i] = bitrev8(runtime->dma_area[idx]);
1660 }
1661
1662 subs->hwptr_done += bytes;
1663 if (subs->hwptr_done >= runtime->buffer_size * stride)
1664 subs->hwptr_done -= runtime->buffer_size * stride;
1665 } else {
1666 /* usual PCM */
1667 if (!subs->tx_length_quirk)
1668 copy_to_urb(subs, urb, 0, stride, bytes);
1669 else
1670 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1671 /* bytes is now amount of outgoing data */
1672 }
1673
1674 /* update delay with exact number of samples queued */
1675 runtime->delay = subs->last_delay;
1676 runtime->delay += frames;
1677 subs->last_delay = runtime->delay;
1678
1679 /* realign last_frame_number */
1680 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1681 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1682
1683 if (subs->trigger_tstamp_pending_update) {
1684 /* this is the first actual URB submitted,
1685 * update trigger timestamp to reflect actual start time
1686 */
1687 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1688 subs->trigger_tstamp_pending_update = false;
1689 }
1690
1691 spin_unlock_irqrestore(&subs->lock, flags);
1692 urb->transfer_buffer_length = bytes;
1693 if (period_elapsed)
1694 snd_pcm_period_elapsed(subs->pcm_substream);
1695 }
1696
1697 /*
1698 * process after playback data complete
1699 * - decrease the delay count again
1700 */
retire_playback_urb(struct snd_usb_substream * subs,struct urb * urb)1701 static void retire_playback_urb(struct snd_usb_substream *subs,
1702 struct urb *urb)
1703 {
1704 unsigned long flags;
1705 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1706 struct snd_usb_endpoint *ep = subs->data_endpoint;
1707 int processed = urb->transfer_buffer_length / ep->stride;
1708 int est_delay;
1709
1710 /* ignore the delay accounting when processed=0 is given, i.e.
1711 * silent payloads are processed before handling the actual data
1712 */
1713 if (!processed)
1714 return;
1715
1716 spin_lock_irqsave(&subs->lock, flags);
1717 if (!subs->last_delay)
1718 goto out; /* short path */
1719
1720 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1721 /* update delay with exact number of samples played */
1722 if (processed > subs->last_delay)
1723 subs->last_delay = 0;
1724 else
1725 subs->last_delay -= processed;
1726 runtime->delay = subs->last_delay;
1727
1728 /*
1729 * Report when delay estimate is off by more than 2ms.
1730 * The error should be lower than 2ms since the estimate relies
1731 * on two reads of a counter updated every ms.
1732 */
1733 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1734 dev_dbg_ratelimited(&subs->dev->dev,
1735 "delay: estimated %d, actual %d\n",
1736 est_delay, subs->last_delay);
1737
1738 if (!subs->running) {
1739 /* update last_frame_number for delay counting here since
1740 * prepare_playback_urb won't be called during pause
1741 */
1742 subs->last_frame_number =
1743 usb_get_current_frame_number(subs->dev) & 0xff;
1744 }
1745
1746 out:
1747 spin_unlock_irqrestore(&subs->lock, flags);
1748 }
1749
snd_usb_substream_playback_trigger(struct snd_pcm_substream * substream,int cmd)1750 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1751 int cmd)
1752 {
1753 struct snd_usb_substream *subs = substream->runtime->private_data;
1754
1755 switch (cmd) {
1756 case SNDRV_PCM_TRIGGER_START:
1757 subs->trigger_tstamp_pending_update = true;
1758 fallthrough;
1759 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1760 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1761 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1762 subs->running = 1;
1763 return 0;
1764 case SNDRV_PCM_TRIGGER_STOP:
1765 stop_endpoints(subs);
1766 subs->running = 0;
1767 return 0;
1768 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1769 subs->data_endpoint->prepare_data_urb = NULL;
1770 /* keep retire_data_urb for delay calculation */
1771 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1772 subs->running = 0;
1773 return 0;
1774 case SNDRV_PCM_TRIGGER_SUSPEND:
1775 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1776 stop_endpoints(subs);
1777 subs->need_setup_fmt = true;
1778 return 0;
1779 }
1780 break;
1781 }
1782
1783 return -EINVAL;
1784 }
1785
snd_usb_substream_capture_trigger(struct snd_pcm_substream * substream,int cmd)1786 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1787 int cmd)
1788 {
1789 int err;
1790 struct snd_usb_substream *subs = substream->runtime->private_data;
1791
1792 switch (cmd) {
1793 case SNDRV_PCM_TRIGGER_START:
1794 err = start_endpoints(subs);
1795 if (err < 0)
1796 return err;
1797
1798 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1799 subs->running = 1;
1800 return 0;
1801 case SNDRV_PCM_TRIGGER_STOP:
1802 stop_endpoints(subs);
1803 subs->data_endpoint->retire_data_urb = NULL;
1804 subs->running = 0;
1805 return 0;
1806 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1807 subs->data_endpoint->retire_data_urb = NULL;
1808 subs->running = 0;
1809 return 0;
1810 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1811 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1812 subs->running = 1;
1813 return 0;
1814 case SNDRV_PCM_TRIGGER_SUSPEND:
1815 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1816 stop_endpoints(subs);
1817 subs->need_setup_fmt = true;
1818 return 0;
1819 }
1820 break;
1821 }
1822
1823 return -EINVAL;
1824 }
1825
1826 static const struct snd_pcm_ops snd_usb_playback_ops = {
1827 .open = snd_usb_pcm_open,
1828 .close = snd_usb_pcm_close,
1829 .hw_params = snd_usb_hw_params,
1830 .hw_free = snd_usb_hw_free,
1831 .prepare = snd_usb_pcm_prepare,
1832 .trigger = snd_usb_substream_playback_trigger,
1833 .sync_stop = snd_usb_pcm_sync_stop,
1834 .pointer = snd_usb_pcm_pointer,
1835 };
1836
1837 static const struct snd_pcm_ops snd_usb_capture_ops = {
1838 .open = snd_usb_pcm_open,
1839 .close = snd_usb_pcm_close,
1840 .hw_params = snd_usb_hw_params,
1841 .hw_free = snd_usb_hw_free,
1842 .prepare = snd_usb_pcm_prepare,
1843 .trigger = snd_usb_substream_capture_trigger,
1844 .sync_stop = snd_usb_pcm_sync_stop,
1845 .pointer = snd_usb_pcm_pointer,
1846 };
1847
snd_usb_set_pcm_ops(struct snd_pcm * pcm,int stream)1848 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1849 {
1850 const struct snd_pcm_ops *ops;
1851
1852 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1853 &snd_usb_playback_ops : &snd_usb_capture_ops;
1854 snd_pcm_set_ops(pcm, stream, ops);
1855 }
1856
snd_usb_preallocate_buffer(struct snd_usb_substream * subs)1857 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1858 {
1859 struct snd_pcm *pcm = subs->stream->pcm;
1860 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1861 struct device *dev = subs->dev->bus->sysdev;
1862
1863 if (snd_usb_use_vmalloc)
1864 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1865 NULL, 0, 0);
1866 else
1867 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1868 dev, 64*1024, 512*1024);
1869 }
1870