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Merge tag 'linux-kselftest-kunit-fixes-5.11-rc3' of git://git.kernel.org/pub/scm...
[linux/fpc-iii.git] / sound / usb / pcm.c
blob56079901769fd93413df9c24f49dbd9ff76d4cf0
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 "endpoint.h"
21 #include "helper.h"
22 #include "pcm.h"
23 #include "clock.h"
24 #include "power.h"
25 #include "media.h"
26 #include "implicit.h"
27
28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
30
31 /* return the estimated delay based on USB frame counters */
32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
33 unsigned int rate)
34 {
35 int current_frame_number;
36 int frame_diff;
37 int est_delay;
38
39 if (!subs->last_delay)
40 return 0; /* short path */
41
42 current_frame_number = usb_get_current_frame_number(subs->dev);
43 /*
44 * HCD implementations use different widths, use lower 8 bits.
45 * The delay will be managed up to 256ms, which is more than
46 * enough
47 */
48 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
49
50 /* Approximation based on number of samples per USB frame (ms),
51 some truncation for 44.1 but the estimate is good enough */
52 est_delay = frame_diff * rate / 1000;
53 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
54 est_delay = subs->last_delay - est_delay;
55 else
56 est_delay = subs->last_delay + est_delay;
57
58 if (est_delay < 0)
59 est_delay = 0;
60 return est_delay;
61 }
62
63 /*
64 * return the current pcm pointer. just based on the hwptr_done value.
65 */
66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
67 {
68 struct snd_usb_substream *subs = substream->runtime->private_data;
69 unsigned int hwptr_done;
70
71 if (atomic_read(&subs->stream->chip->shutdown))
72 return SNDRV_PCM_POS_XRUN;
73 spin_lock(&subs->lock);
74 hwptr_done = subs->hwptr_done;
75 substream->runtime->delay = snd_usb_pcm_delay(subs,
76 substream->runtime->rate);
77 spin_unlock(&subs->lock);
78 return hwptr_done / (substream->runtime->frame_bits >> 3);
79 }
80
81 /*
82 * find a matching audio format
83 */
84 static const struct audioformat *
85 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
86 unsigned int rate, unsigned int channels, bool strict_match,
87 struct snd_usb_substream *subs)
88 {
89 const struct audioformat *fp;
90 const struct audioformat *found = NULL;
91 int cur_attr = 0, attr;
92
93 list_for_each_entry(fp, fmt_list_head, list) {
94 if (strict_match) {
95 if (!(fp->formats & pcm_format_to_bits(format)))
96 continue;
97 if (fp->channels != channels)
98 continue;
99 }
100 if (rate < fp->rate_min || rate > fp->rate_max)
101 continue;
102 if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
103 unsigned int i;
104 for (i = 0; i < fp->nr_rates; i++)
105 if (fp->rate_table[i] == rate)
106 break;
107 if (i >= fp->nr_rates)
108 continue;
109 }
110 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
111 if (!found) {
112 found = fp;
113 cur_attr = attr;
114 continue;
115 }
116 /* avoid async out and adaptive in if the other method
117 * supports the same format.
118 * this is a workaround for the case like
119 * M-audio audiophile USB.
120 */
121 if (subs && attr != cur_attr) {
122 if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
123 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
124 (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
125 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
126 continue;
127 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
128 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
129 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
130 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
131 found = fp;
132 cur_attr = attr;
133 continue;
134 }
135 }
136 /* find the format with the largest max. packet size */
137 if (fp->maxpacksize > found->maxpacksize) {
138 found = fp;
139 cur_attr = attr;
140 }
141 }
142 return found;
143 }
144
145 static const struct audioformat *
146 find_substream_format(struct snd_usb_substream *subs,
147 const struct snd_pcm_hw_params *params)
148 {
149 return find_format(&subs->fmt_list, params_format(params),
150 params_rate(params), params_channels(params),
151 true, subs);
152 }
153
154 static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
155 {
156 struct usb_device *dev = chip->dev;
157 unsigned char data[1];
158 int err;
159
160 data[0] = 1;
161 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
162 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
163 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
164 data, sizeof(data));
165 return err;
166 }
167
168 static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
169 {
170 struct usb_device *dev = chip->dev;
171 unsigned char data[1];
172 int err;
173
174 data[0] = 1;
175 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
176 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
177 UAC2_EP_CS_PITCH << 8, 0,
178 data, sizeof(data));
179 return err;
180 }
181
182 /*
183 * initialize the pitch control and sample rate
184 */
185 int snd_usb_init_pitch(struct snd_usb_audio *chip,
186 const struct audioformat *fmt)
187 {
188 int err;
189
190 /* if endpoint doesn't have pitch control, bail out */
191 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
192 return 0;
193
194 usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
195
196 switch (fmt->protocol) {
197 case UAC_VERSION_1:
198 err = init_pitch_v1(chip, fmt->endpoint);
199 break;
200 case UAC_VERSION_2:
201 err = init_pitch_v2(chip, fmt->endpoint);
202 break;
203 default:
204 return 0;
205 }
206
207 if (err < 0) {
208 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
209 fmt->endpoint);
210 return err;
211 }
212
213 return 0;
214 }
215
216 static bool stop_endpoints(struct snd_usb_substream *subs)
217 {
218 bool stopped = 0;
219
220 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
221 snd_usb_endpoint_stop(subs->sync_endpoint);
222 stopped = true;
223 }
224 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
225 snd_usb_endpoint_stop(subs->data_endpoint);
226 stopped = true;
227 }
228 return stopped;
229 }
230
231 static int start_endpoints(struct snd_usb_substream *subs)
232 {
233 int err;
234
235 if (!subs->data_endpoint)
236 return -EINVAL;
237
238 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
239 err = snd_usb_endpoint_start(subs->data_endpoint);
240 if (err < 0) {
241 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
242 goto error;
243 }
244 }
245
246 if (subs->sync_endpoint &&
247 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
248 err = snd_usb_endpoint_start(subs->sync_endpoint);
249 if (err < 0) {
250 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
251 goto error;
252 }
253 }
254
255 return 0;
256
257 error:
258 stop_endpoints(subs);
259 return err;
260 }
261
262 static void sync_pending_stops(struct snd_usb_substream *subs)
263 {
264 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
265 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
266 }
267
268 /* PCM sync_stop callback */
269 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
270 {
271 struct snd_usb_substream *subs = substream->runtime->private_data;
272
273 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
274 sync_pending_stops(subs);
275 snd_usb_unlock_shutdown(subs->stream->chip);
276 }
277 return 0;
278 }
279
280 /* Set up sync endpoint */
281 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
282 struct audioformat *fmt)
283 {
284 struct usb_device *dev = chip->dev;
285 struct usb_host_interface *alts;
286 struct usb_interface_descriptor *altsd;
287 unsigned int ep, attr, sync_attr;
288 bool is_playback;
289 int err;
290
291 alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
292 if (!alts)
293 return 0;
294 altsd = get_iface_desc(alts);
295
296 err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
297 if (err > 0)
298 return 0; /* matched */
299
300 /*
301 * Generic sync EP handling
302 */
303
304 if (altsd->bNumEndpoints < 2)
305 return 0;
306
307 is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
308 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
309 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
310 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
311 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
312 return 0;
313
314 sync_attr = get_endpoint(alts, 1)->bmAttributes;
315
316 /*
317 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
318 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
319 * error fall back to SYNC mode and don't create sync endpoint
320 */
321
322 /* check sync-pipe endpoint */
323 /* ... and check descriptor size before accessing bSynchAddress
324 because there is a version of the SB Audigy 2 NX firmware lacking
325 the audio fields in the endpoint descriptors */
326 if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
327 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
328 get_endpoint(alts, 1)->bSynchAddress != 0)) {
329 dev_err(&dev->dev,
330 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
331 fmt->iface, fmt->altsetting,
332 get_endpoint(alts, 1)->bmAttributes,
333 get_endpoint(alts, 1)->bLength,
334 get_endpoint(alts, 1)->bSynchAddress);
335 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
336 return 0;
337 return -EINVAL;
338 }
339 ep = get_endpoint(alts, 1)->bEndpointAddress;
340 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
341 get_endpoint(alts, 0)->bSynchAddress != 0 &&
342 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
343 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
344 dev_err(&dev->dev,
345 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
346 fmt->iface, fmt->altsetting,
347 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
348 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
349 return 0;
350 return -EINVAL;
351 }
352
353 fmt->sync_ep = ep;
354 fmt->sync_iface = altsd->bInterfaceNumber;
355 fmt->sync_altsetting = altsd->bAlternateSetting;
356 fmt->sync_ep_idx = 1;
357 if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
358 fmt->implicit_fb = 1;
359
360 dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
361 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
362 fmt->sync_altsetting, fmt->implicit_fb);
363
364 return 0;
365 }
366
367 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
368 {
369 int ret;
370
371 if (!subs->str_pd)
372 return 0;
373
374 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
375 if (ret < 0) {
376 dev_err(&subs->dev->dev,
377 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
378 subs->str_pd->pd_id, state, ret);
379 return ret;
380 }
381
382 return 0;
383 }
384
385 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
386 {
387 int ret;
388
389 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
390 if (ret < 0)
391 return ret;
392
393 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
394 if (ret < 0)
395 return ret;
396
397 return 0;
398 }
399
400 int snd_usb_pcm_resume(struct snd_usb_stream *as)
401 {
402 int ret;
403
404 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
405 if (ret < 0)
406 return ret;
407
408 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
409 if (ret < 0)
410 return ret;
411
412 return 0;
413 }
414
415 static void close_endpoints(struct snd_usb_audio *chip,
416 struct snd_usb_substream *subs)
417 {
418 if (subs->data_endpoint) {
419 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
420 snd_usb_endpoint_close(chip, subs->data_endpoint);
421 subs->data_endpoint = NULL;
422 }
423
424 if (subs->sync_endpoint) {
425 snd_usb_endpoint_close(chip, subs->sync_endpoint);
426 subs->sync_endpoint = NULL;
427 }
428 }
429
430 static int configure_endpoints(struct snd_usb_audio *chip,
431 struct snd_usb_substream *subs)
432 {
433 int err;
434
435 if (subs->data_endpoint->need_setup) {
436 /* stop any running stream beforehand */
437 if (stop_endpoints(subs))
438 sync_pending_stops(subs);
439 err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
440 if (err < 0)
441 return err;
442 snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
443 }
444
445 if (subs->sync_endpoint) {
446 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
447 if (err < 0)
448 return err;
449 }
450
451 return 0;
452 }
453
454 /*
455 * hw_params callback
456 *
457 * allocate a buffer and set the given audio format.
458 *
459 * so far we use a physically linear buffer although packetize transfer
460 * doesn't need a continuous area.
461 * if sg buffer is supported on the later version of alsa, we'll follow
462 * that.
463 */
464 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
465 struct snd_pcm_hw_params *hw_params)
466 {
467 struct snd_usb_substream *subs = substream->runtime->private_data;
468 struct snd_usb_audio *chip = subs->stream->chip;
469 const struct audioformat *fmt;
470 const struct audioformat *sync_fmt;
471 int ret;
472
473 ret = snd_media_start_pipeline(subs);
474 if (ret)
475 return ret;
476
477 fmt = find_substream_format(subs, hw_params);
478 if (!fmt) {
479 usb_audio_dbg(chip,
480 "cannot find format: format=%s, rate=%d, channels=%d\n",
481 snd_pcm_format_name(params_format(hw_params)),
482 params_rate(hw_params), params_channels(hw_params));
483 ret = -EINVAL;
484 goto stop_pipeline;
485 }
486
487 if (fmt->implicit_fb) {
488 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
489 hw_params,
490 !substream->stream);
491 if (!sync_fmt) {
492 usb_audio_dbg(chip,
493 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
494 fmt->sync_ep, fmt->sync_iface,
495 fmt->sync_altsetting,
496 snd_pcm_format_name(params_format(hw_params)),
497 params_rate(hw_params), params_channels(hw_params));
498 ret = -EINVAL;
499 goto stop_pipeline;
500 }
501 } else {
502 sync_fmt = fmt;
503 }
504
505 ret = snd_usb_lock_shutdown(chip);
506 if (ret < 0)
507 goto stop_pipeline;
508
509 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
510 if (ret < 0)
511 goto unlock;
512
513 if (subs->data_endpoint) {
514 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
515 fmt, hw_params))
516 goto unlock;
517 close_endpoints(chip, subs);
518 }
519
520 subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
521 if (!subs->data_endpoint) {
522 ret = -EINVAL;
523 goto unlock;
524 }
525
526 if (fmt->sync_ep) {
527 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
528 hw_params,
529 fmt == sync_fmt);
530 if (!subs->sync_endpoint) {
531 ret = -EINVAL;
532 goto unlock;
533 }
534
535 snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
536 subs->sync_endpoint);
537 }
538
539 mutex_lock(&chip->mutex);
540 subs->cur_audiofmt = fmt;
541 mutex_unlock(&chip->mutex);
542
543 ret = configure_endpoints(chip, subs);
544
545 unlock:
546 if (ret < 0)
547 close_endpoints(chip, subs);
548
549 snd_usb_unlock_shutdown(chip);
550 stop_pipeline:
551 if (ret < 0)
552 snd_media_stop_pipeline(subs);
553
554 return ret;
555 }
556
557 /*
558 * hw_free callback
559 *
560 * reset the audio format and release the buffer
561 */
562 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
563 {
564 struct snd_usb_substream *subs = substream->runtime->private_data;
565 struct snd_usb_audio *chip = subs->stream->chip;
566
567 snd_media_stop_pipeline(subs);
568 mutex_lock(&chip->mutex);
569 subs->cur_audiofmt = NULL;
570 mutex_unlock(&chip->mutex);
571 if (!snd_usb_lock_shutdown(chip)) {
572 if (stop_endpoints(subs))
573 sync_pending_stops(subs);
574 close_endpoints(chip, subs);
575 snd_usb_unlock_shutdown(chip);
576 }
577
578 return 0;
579 }
580
581 /*
582 * prepare callback
583 *
584 * only a few subtle things...
585 */
586 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
587 {
588 struct snd_pcm_runtime *runtime = substream->runtime;
589 struct snd_usb_substream *subs = runtime->private_data;
590 struct snd_usb_audio *chip = subs->stream->chip;
591 int ret;
592
593 ret = snd_usb_lock_shutdown(chip);
594 if (ret < 0)
595 return ret;
596 if (snd_BUG_ON(!subs->data_endpoint)) {
597 ret = -EIO;
598 goto unlock;
599 }
600
601 ret = configure_endpoints(chip, subs);
602 if (ret < 0)
603 goto unlock;
604
605 /* reset the pointer */
606 subs->hwptr_done = 0;
607 subs->transfer_done = 0;
608 subs->last_delay = 0;
609 subs->last_frame_number = 0;
610 runtime->delay = 0;
611
612 /* for playback, submit the URBs now; otherwise, the first hwptr_done
613 * updates for all URBs would happen at the same time when starting */
614 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
615 ret = start_endpoints(subs);
616
617 unlock:
618 snd_usb_unlock_shutdown(chip);
619 return ret;
620 }
621
622 /*
623 * h/w constraints
624 */
625
626 #ifdef HW_CONST_DEBUG
627 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
628 #else
629 #define hwc_debug(fmt, args...) do { } while(0)
630 #endif
631
632 static const struct snd_pcm_hardware snd_usb_hardware =
633 {
634 .info = SNDRV_PCM_INFO_MMAP |
635 SNDRV_PCM_INFO_MMAP_VALID |
636 SNDRV_PCM_INFO_BATCH |
637 SNDRV_PCM_INFO_INTERLEAVED |
638 SNDRV_PCM_INFO_BLOCK_TRANSFER |
639 SNDRV_PCM_INFO_PAUSE,
640 .channels_min = 1,
641 .channels_max = 256,
642 .buffer_bytes_max = 1024 * 1024,
643 .period_bytes_min = 64,
644 .period_bytes_max = 512 * 1024,
645 .periods_min = 2,
646 .periods_max = 1024,
647 };
648
649 static int hw_check_valid_format(struct snd_usb_substream *subs,
650 struct snd_pcm_hw_params *params,
651 const struct audioformat *fp)
652 {
653 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
654 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
655 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
656 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
657 struct snd_mask check_fmts;
658 unsigned int ptime;
659
660 /* check the format */
661 snd_mask_none(&check_fmts);
662 check_fmts.bits[0] = (u32)fp->formats;
663 check_fmts.bits[1] = (u32)(fp->formats >> 32);
664 snd_mask_intersect(&check_fmts, fmts);
665 if (snd_mask_empty(&check_fmts)) {
666 hwc_debug(" > check: no supported format %d\n", fp->format);
667 return 0;
668 }
669 /* check the channels */
670 if (fp->channels < ct->min || fp->channels > ct->max) {
671 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
672 return 0;
673 }
674 /* check the rate is within the range */
675 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
676 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
677 return 0;
678 }
679 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
680 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
681 return 0;
682 }
683 /* check whether the period time is >= the data packet interval */
684 if (subs->speed != USB_SPEED_FULL) {
685 ptime = 125 * (1 << fp->datainterval);
686 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
687 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
688 return 0;
689 }
690 }
691 return 1;
692 }
693
694 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
695 unsigned int rmax)
696 {
697 int changed;
698
699 if (rmin > rmax) {
700 hwc_debug(" --> get empty\n");
701 it->empty = 1;
702 return -EINVAL;
703 }
704
705 changed = 0;
706 if (it->min < rmin) {
707 it->min = rmin;
708 it->openmin = 0;
709 changed = 1;
710 }
711 if (it->max > rmax) {
712 it->max = rmax;
713 it->openmax = 0;
714 changed = 1;
715 }
716 if (snd_interval_checkempty(it)) {
717 it->empty = 1;
718 return -EINVAL;
719 }
720 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
721 return changed;
722 }
723
724 static int hw_rule_rate(struct snd_pcm_hw_params *params,
725 struct snd_pcm_hw_rule *rule)
726 {
727 struct snd_usb_substream *subs = rule->private;
728 const struct audioformat *fp;
729 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
730 unsigned int rmin, rmax, r;
731 int i;
732
733 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
734 rmin = UINT_MAX;
735 rmax = 0;
736 list_for_each_entry(fp, &subs->fmt_list, list) {
737 if (!hw_check_valid_format(subs, params, fp))
738 continue;
739 if (fp->rate_table && fp->nr_rates) {
740 for (i = 0; i < fp->nr_rates; i++) {
741 r = fp->rate_table[i];
742 if (!snd_interval_test(it, r))
743 continue;
744 rmin = min(rmin, r);
745 rmax = max(rmax, r);
746 }
747 } else {
748 rmin = min(rmin, fp->rate_min);
749 rmax = max(rmax, fp->rate_max);
750 }
751 }
752
753 return apply_hw_params_minmax(it, rmin, rmax);
754 }
755
756
757 static int hw_rule_channels(struct snd_pcm_hw_params *params,
758 struct snd_pcm_hw_rule *rule)
759 {
760 struct snd_usb_substream *subs = rule->private;
761 const struct audioformat *fp;
762 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
763 unsigned int rmin, rmax;
764
765 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
766 rmin = UINT_MAX;
767 rmax = 0;
768 list_for_each_entry(fp, &subs->fmt_list, list) {
769 if (!hw_check_valid_format(subs, params, fp))
770 continue;
771 rmin = min(rmin, fp->channels);
772 rmax = max(rmax, fp->channels);
773 }
774
775 return apply_hw_params_minmax(it, rmin, rmax);
776 }
777
778 static int hw_rule_format(struct snd_pcm_hw_params *params,
779 struct snd_pcm_hw_rule *rule)
780 {
781 struct snd_usb_substream *subs = rule->private;
782 const struct audioformat *fp;
783 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
784 u64 fbits;
785 u32 oldbits[2];
786 int changed;
787
788 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
789 fbits = 0;
790 list_for_each_entry(fp, &subs->fmt_list, list) {
791 if (!hw_check_valid_format(subs, params, fp))
792 continue;
793 fbits |= fp->formats;
794 }
795
796 oldbits[0] = fmt->bits[0];
797 oldbits[1] = fmt->bits[1];
798 fmt->bits[0] &= (u32)fbits;
799 fmt->bits[1] &= (u32)(fbits >> 32);
800 if (!fmt->bits[0] && !fmt->bits[1]) {
801 hwc_debug(" --> get empty\n");
802 return -EINVAL;
803 }
804 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
805 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
806 return changed;
807 }
808
809 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
810 struct snd_pcm_hw_rule *rule)
811 {
812 struct snd_usb_substream *subs = rule->private;
813 const struct audioformat *fp;
814 struct snd_interval *it;
815 unsigned char min_datainterval;
816 unsigned int pmin;
817
818 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
819 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
820 min_datainterval = 0xff;
821 list_for_each_entry(fp, &subs->fmt_list, list) {
822 if (!hw_check_valid_format(subs, params, fp))
823 continue;
824 min_datainterval = min(min_datainterval, fp->datainterval);
825 }
826 if (min_datainterval == 0xff) {
827 hwc_debug(" --> get empty\n");
828 it->empty = 1;
829 return -EINVAL;
830 }
831 pmin = 125 * (1 << min_datainterval);
832
833 return apply_hw_params_minmax(it, pmin, UINT_MAX);
834 }
835
836 /* apply PCM hw constraints from the concurrent sync EP */
837 static int apply_hw_constraint_from_sync(struct snd_pcm_runtime *runtime,
838 struct snd_usb_substream *subs)
839 {
840 struct snd_usb_audio *chip = subs->stream->chip;
841 struct snd_usb_endpoint *ep;
842 const struct audioformat *fp;
843 int err;
844
845 list_for_each_entry(fp, &subs->fmt_list, list) {
846 ep = snd_usb_get_endpoint(chip, fp->endpoint);
847 if (ep && ep->cur_rate)
848 goto found;
849 if (!fp->implicit_fb)
850 continue;
851 /* for the implicit fb, check the sync ep as well */
852 ep = snd_usb_get_endpoint(chip, fp->sync_ep);
853 if (ep && ep->cur_rate)
854 goto found;
855 }
856 return 0;
857
858 found:
859 if (!find_format(&subs->fmt_list, ep->cur_format, ep->cur_rate,
860 ep->cur_channels, false, NULL)) {
861 usb_audio_dbg(chip, "EP 0x%x being used, but not applicable\n",
862 ep->ep_num);
863 return 0;
864 }
865
866 usb_audio_dbg(chip, "EP 0x%x being used, using fixed params:\n",
867 ep->ep_num);
868 usb_audio_dbg(chip, "rate=%d, period_size=%d, periods=%d\n",
869 ep->cur_rate, ep->cur_period_frames,
870 ep->cur_buffer_periods);
871
872 runtime->hw.formats = subs->formats;
873 runtime->hw.rate_min = runtime->hw.rate_max = ep->cur_rate;
874 runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
875 runtime->hw.periods_min = runtime->hw.periods_max =
876 ep->cur_buffer_periods;
877
878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
879 hw_rule_channels, subs,
880 SNDRV_PCM_HW_PARAM_FORMAT,
881 SNDRV_PCM_HW_PARAM_RATE,
882 -1);
883 if (err < 0)
884 return err;
885
886 err = snd_pcm_hw_constraint_minmax(runtime,
887 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
888 ep->cur_period_frames,
889 ep->cur_period_frames);
890 if (err < 0)
891 return err;
892
893 return 1; /* notify the finding */
894 }
895
896 /*
897 * set up the runtime hardware information.
898 */
899
900 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
901 {
902 struct snd_usb_audio *chip = subs->stream->chip;
903 const struct audioformat *fp;
904 unsigned int pt, ptmin;
905 int param_period_time_if_needed = -1;
906 int err;
907
908 mutex_lock(&chip->mutex);
909 err = apply_hw_constraint_from_sync(runtime, subs);
910 mutex_unlock(&chip->mutex);
911 if (err < 0)
912 return err;
913 if (err > 0) /* found the matching? */
914 goto add_extra_rules;
915
916 runtime->hw.formats = subs->formats;
917
918 runtime->hw.rate_min = 0x7fffffff;
919 runtime->hw.rate_max = 0;
920 runtime->hw.channels_min = 256;
921 runtime->hw.channels_max = 0;
922 runtime->hw.rates = 0;
923 ptmin = UINT_MAX;
924 /* check min/max rates and channels */
925 list_for_each_entry(fp, &subs->fmt_list, list) {
926 runtime->hw.rates |= fp->rates;
927 if (runtime->hw.rate_min > fp->rate_min)
928 runtime->hw.rate_min = fp->rate_min;
929 if (runtime->hw.rate_max < fp->rate_max)
930 runtime->hw.rate_max = fp->rate_max;
931 if (runtime->hw.channels_min > fp->channels)
932 runtime->hw.channels_min = fp->channels;
933 if (runtime->hw.channels_max < fp->channels)
934 runtime->hw.channels_max = fp->channels;
935 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
936 /* FIXME: there might be more than one audio formats... */
937 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
938 fp->frame_size;
939 }
940 pt = 125 * (1 << fp->datainterval);
941 ptmin = min(ptmin, pt);
942 }
943
944 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
945 if (subs->speed == USB_SPEED_FULL)
946 /* full speed devices have fixed data packet interval */
947 ptmin = 1000;
948 if (ptmin == 1000)
949 /* if period time doesn't go below 1 ms, no rules needed */
950 param_period_time_if_needed = -1;
951
952 err = snd_pcm_hw_constraint_minmax(runtime,
953 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
954 ptmin, UINT_MAX);
955 if (err < 0)
956 return err;
957
958 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
959 hw_rule_rate, subs,
960 SNDRV_PCM_HW_PARAM_FORMAT,
961 SNDRV_PCM_HW_PARAM_CHANNELS,
962 param_period_time_if_needed,
963 -1);
964 if (err < 0)
965 return err;
966
967 add_extra_rules:
968 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
969 hw_rule_channels, subs,
970 SNDRV_PCM_HW_PARAM_FORMAT,
971 SNDRV_PCM_HW_PARAM_RATE,
972 param_period_time_if_needed,
973 -1);
974 if (err < 0)
975 return err;
976 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
977 hw_rule_format, subs,
978 SNDRV_PCM_HW_PARAM_RATE,
979 SNDRV_PCM_HW_PARAM_CHANNELS,
980 param_period_time_if_needed,
981 -1);
982 if (err < 0)
983 return err;
984 if (param_period_time_if_needed >= 0) {
985 err = snd_pcm_hw_rule_add(runtime, 0,
986 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
987 hw_rule_period_time, subs,
988 SNDRV_PCM_HW_PARAM_FORMAT,
989 SNDRV_PCM_HW_PARAM_CHANNELS,
990 SNDRV_PCM_HW_PARAM_RATE,
991 -1);
992 if (err < 0)
993 return err;
994 }
995
996 return 0;
997 }
998
999 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1000 {
1001 int direction = substream->stream;
1002 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1003 struct snd_pcm_runtime *runtime = substream->runtime;
1004 struct snd_usb_substream *subs = &as->substream[direction];
1005 int ret;
1006
1007 runtime->hw = snd_usb_hardware;
1008 runtime->private_data = subs;
1009 subs->pcm_substream = substream;
1010 /* runtime PM is also done there */
1011
1012 /* initialize DSD/DOP context */
1013 subs->dsd_dop.byte_idx = 0;
1014 subs->dsd_dop.channel = 0;
1015 subs->dsd_dop.marker = 1;
1016
1017 ret = setup_hw_info(runtime, subs);
1018 if (ret < 0)
1019 return ret;
1020 ret = snd_usb_autoresume(subs->stream->chip);
1021 if (ret < 0)
1022 return ret;
1023 ret = snd_media_stream_init(subs, as->pcm, direction);
1024 if (ret < 0)
1025 snd_usb_autosuspend(subs->stream->chip);
1026 return ret;
1027 }
1028
1029 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1030 {
1031 int direction = substream->stream;
1032 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1033 struct snd_usb_substream *subs = &as->substream[direction];
1034 int ret;
1035
1036 snd_media_stop_pipeline(subs);
1037
1038 if (!snd_usb_lock_shutdown(subs->stream->chip)) {
1039 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1040 snd_usb_unlock_shutdown(subs->stream->chip);
1041 if (ret < 0)
1042 return ret;
1043 }
1044
1045 subs->pcm_substream = NULL;
1046 snd_usb_autosuspend(subs->stream->chip);
1047
1048 return 0;
1049 }
1050
1051 /* Since a URB can handle only a single linear buffer, we must use double
1052 * buffering when the data to be transferred overflows the buffer boundary.
1053 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1054 * for all URBs.
1055 */
1056 static void retire_capture_urb(struct snd_usb_substream *subs,
1057 struct urb *urb)
1058 {
1059 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1060 unsigned int stride, frames, bytes, oldptr;
1061 int i, period_elapsed = 0;
1062 unsigned long flags;
1063 unsigned char *cp;
1064 int current_frame_number;
1065
1066 /* read frame number here, update pointer in critical section */
1067 current_frame_number = usb_get_current_frame_number(subs->dev);
1068
1069 stride = runtime->frame_bits >> 3;
1070
1071 for (i = 0; i < urb->number_of_packets; i++) {
1072 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1073 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1074 dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1075 i, urb->iso_frame_desc[i].status);
1076 // continue;
1077 }
1078 bytes = urb->iso_frame_desc[i].actual_length;
1079 if (subs->stream_offset_adj > 0) {
1080 unsigned int adj = min(subs->stream_offset_adj, bytes);
1081 cp += adj;
1082 bytes -= adj;
1083 subs->stream_offset_adj -= adj;
1084 }
1085 frames = bytes / stride;
1086 if (!subs->txfr_quirk)
1087 bytes = frames * stride;
1088 if (bytes % (runtime->sample_bits >> 3) != 0) {
1089 int oldbytes = bytes;
1090 bytes = frames * stride;
1091 dev_warn_ratelimited(&subs->dev->dev,
1092 "Corrected urb data len. %d->%d\n",
1093 oldbytes, bytes);
1094 }
1095 /* update the current pointer */
1096 spin_lock_irqsave(&subs->lock, flags);
1097 oldptr = subs->hwptr_done;
1098 subs->hwptr_done += bytes;
1099 if (subs->hwptr_done >= runtime->buffer_size * stride)
1100 subs->hwptr_done -= runtime->buffer_size * stride;
1101 frames = (bytes + (oldptr % stride)) / stride;
1102 subs->transfer_done += frames;
1103 if (subs->transfer_done >= runtime->period_size) {
1104 subs->transfer_done -= runtime->period_size;
1105 period_elapsed = 1;
1106 }
1107 /* capture delay is by construction limited to one URB,
1108 * reset delays here
1109 */
1110 runtime->delay = subs->last_delay = 0;
1111
1112 /* realign last_frame_number */
1113 subs->last_frame_number = current_frame_number;
1114 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1115
1116 spin_unlock_irqrestore(&subs->lock, flags);
1117 /* copy a data chunk */
1118 if (oldptr + bytes > runtime->buffer_size * stride) {
1119 unsigned int bytes1 =
1120 runtime->buffer_size * stride - oldptr;
1121 memcpy(runtime->dma_area + oldptr, cp, bytes1);
1122 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1123 } else {
1124 memcpy(runtime->dma_area + oldptr, cp, bytes);
1125 }
1126 }
1127
1128 if (period_elapsed)
1129 snd_pcm_period_elapsed(subs->pcm_substream);
1130 }
1131
1132 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1133 struct urb *urb, unsigned int bytes)
1134 {
1135 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1136 unsigned int stride = runtime->frame_bits >> 3;
1137 unsigned int dst_idx = 0;
1138 unsigned int src_idx = subs->hwptr_done;
1139 unsigned int wrap = runtime->buffer_size * stride;
1140 u8 *dst = urb->transfer_buffer;
1141 u8 *src = runtime->dma_area;
1142 u8 marker[] = { 0x05, 0xfa };
1143
1144 /*
1145 * The DSP DOP format defines a way to transport DSD samples over
1146 * normal PCM data endpoints. It requires stuffing of marker bytes
1147 * (0x05 and 0xfa, alternating per sample frame), and then expects
1148 * 2 additional bytes of actual payload. The whole frame is stored
1149 * LSB.
1150 *
1151 * Hence, for a stereo transport, the buffer layout looks like this,
1152 * where L refers to left channel samples and R to right.
1153 *
1154 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
1155 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
1156 * .....
1157 *
1158 */
1159
1160 while (bytes--) {
1161 if (++subs->dsd_dop.byte_idx == 3) {
1162 /* frame boundary? */
1163 dst[dst_idx++] = marker[subs->dsd_dop.marker];
1164 src_idx += 2;
1165 subs->dsd_dop.byte_idx = 0;
1166
1167 if (++subs->dsd_dop.channel % runtime->channels == 0) {
1168 /* alternate the marker */
1169 subs->dsd_dop.marker++;
1170 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1171 subs->dsd_dop.channel = 0;
1172 }
1173 } else {
1174 /* stuff the DSD payload */
1175 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1176
1177 if (subs->cur_audiofmt->dsd_bitrev)
1178 dst[dst_idx++] = bitrev8(src[idx]);
1179 else
1180 dst[dst_idx++] = src[idx];
1181
1182 subs->hwptr_done++;
1183 }
1184 }
1185 if (subs->hwptr_done >= runtime->buffer_size * stride)
1186 subs->hwptr_done -= runtime->buffer_size * stride;
1187 }
1188
1189 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1190 int offset, int stride, unsigned int bytes)
1191 {
1192 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1193
1194 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1195 /* err, the transferred area goes over buffer boundary. */
1196 unsigned int bytes1 =
1197 runtime->buffer_size * stride - subs->hwptr_done;
1198 memcpy(urb->transfer_buffer + offset,
1199 runtime->dma_area + subs->hwptr_done, bytes1);
1200 memcpy(urb->transfer_buffer + offset + bytes1,
1201 runtime->dma_area, bytes - bytes1);
1202 } else {
1203 memcpy(urb->transfer_buffer + offset,
1204 runtime->dma_area + subs->hwptr_done, bytes);
1205 }
1206 subs->hwptr_done += bytes;
1207 if (subs->hwptr_done >= runtime->buffer_size * stride)
1208 subs->hwptr_done -= runtime->buffer_size * stride;
1209 }
1210
1211 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1212 struct urb *urb, int stride,
1213 unsigned int bytes)
1214 {
1215 __le32 packet_length;
1216 int i;
1217
1218 /* Put __le32 length descriptor at start of each packet. */
1219 for (i = 0; i < urb->number_of_packets; i++) {
1220 unsigned int length = urb->iso_frame_desc[i].length;
1221 unsigned int offset = urb->iso_frame_desc[i].offset;
1222
1223 packet_length = cpu_to_le32(length);
1224 offset += i * sizeof(packet_length);
1225 urb->iso_frame_desc[i].offset = offset;
1226 urb->iso_frame_desc[i].length += sizeof(packet_length);
1227 memcpy(urb->transfer_buffer + offset,
1228 &packet_length, sizeof(packet_length));
1229 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1230 stride, length);
1231 }
1232 /* Adjust transfer size accordingly. */
1233 bytes += urb->number_of_packets * sizeof(packet_length);
1234 return bytes;
1235 }
1236
1237 static void prepare_playback_urb(struct snd_usb_substream *subs,
1238 struct urb *urb)
1239 {
1240 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1241 struct snd_usb_endpoint *ep = subs->data_endpoint;
1242 struct snd_urb_ctx *ctx = urb->context;
1243 unsigned int counts, frames, bytes;
1244 int i, stride, period_elapsed = 0;
1245 unsigned long flags;
1246
1247 stride = runtime->frame_bits >> 3;
1248
1249 frames = 0;
1250 urb->number_of_packets = 0;
1251 spin_lock_irqsave(&subs->lock, flags);
1252 subs->frame_limit += ep->max_urb_frames;
1253 for (i = 0; i < ctx->packets; i++) {
1254 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
1255 /* set up descriptor */
1256 urb->iso_frame_desc[i].offset = frames * ep->stride;
1257 urb->iso_frame_desc[i].length = counts * ep->stride;
1258 frames += counts;
1259 urb->number_of_packets++;
1260 subs->transfer_done += counts;
1261 if (subs->transfer_done >= runtime->period_size) {
1262 subs->transfer_done -= runtime->period_size;
1263 subs->frame_limit = 0;
1264 period_elapsed = 1;
1265 if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1266 if (subs->transfer_done > 0) {
1267 /* FIXME: fill-max mode is not
1268 * supported yet */
1269 frames -= subs->transfer_done;
1270 counts -= subs->transfer_done;
1271 urb->iso_frame_desc[i].length =
1272 counts * ep->stride;
1273 subs->transfer_done = 0;
1274 }
1275 i++;
1276 if (i < ctx->packets) {
1277 /* add a transfer delimiter */
1278 urb->iso_frame_desc[i].offset =
1279 frames * ep->stride;
1280 urb->iso_frame_desc[i].length = 0;
1281 urb->number_of_packets++;
1282 }
1283 break;
1284 }
1285 }
1286 /* finish at the period boundary or after enough frames */
1287 if ((period_elapsed ||
1288 subs->transfer_done >= subs->frame_limit) &&
1289 !snd_usb_endpoint_implicit_feedback_sink(ep))
1290 break;
1291 }
1292 bytes = frames * ep->stride;
1293
1294 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1295 subs->cur_audiofmt->dsd_dop)) {
1296 fill_playback_urb_dsd_dop(subs, urb, bytes);
1297 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1298 subs->cur_audiofmt->dsd_bitrev)) {
1299 /* bit-reverse the bytes */
1300 u8 *buf = urb->transfer_buffer;
1301 for (i = 0; i < bytes; i++) {
1302 int idx = (subs->hwptr_done + i)
1303 % (runtime->buffer_size * stride);
1304 buf[i] = bitrev8(runtime->dma_area[idx]);
1305 }
1306
1307 subs->hwptr_done += bytes;
1308 if (subs->hwptr_done >= runtime->buffer_size * stride)
1309 subs->hwptr_done -= runtime->buffer_size * stride;
1310 } else {
1311 /* usual PCM */
1312 if (!subs->tx_length_quirk)
1313 copy_to_urb(subs, urb, 0, stride, bytes);
1314 else
1315 bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1316 /* bytes is now amount of outgoing data */
1317 }
1318
1319 /* update delay with exact number of samples queued */
1320 runtime->delay = subs->last_delay;
1321 runtime->delay += frames;
1322 subs->last_delay = runtime->delay;
1323
1324 /* realign last_frame_number */
1325 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1326 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1327
1328 if (subs->trigger_tstamp_pending_update) {
1329 /* this is the first actual URB submitted,
1330 * update trigger timestamp to reflect actual start time
1331 */
1332 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1333 subs->trigger_tstamp_pending_update = false;
1334 }
1335
1336 spin_unlock_irqrestore(&subs->lock, flags);
1337 urb->transfer_buffer_length = bytes;
1338 if (period_elapsed)
1339 snd_pcm_period_elapsed(subs->pcm_substream);
1340 }
1341
1342 /*
1343 * process after playback data complete
1344 * - decrease the delay count again
1345 */
1346 static void retire_playback_urb(struct snd_usb_substream *subs,
1347 struct urb *urb)
1348 {
1349 unsigned long flags;
1350 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1351 struct snd_usb_endpoint *ep = subs->data_endpoint;
1352 int processed = urb->transfer_buffer_length / ep->stride;
1353 int est_delay;
1354
1355 /* ignore the delay accounting when processed=0 is given, i.e.
1356 * silent payloads are processed before handling the actual data
1357 */
1358 if (!processed)
1359 return;
1360
1361 spin_lock_irqsave(&subs->lock, flags);
1362 if (!subs->last_delay)
1363 goto out; /* short path */
1364
1365 est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1366 /* update delay with exact number of samples played */
1367 if (processed > subs->last_delay)
1368 subs->last_delay = 0;
1369 else
1370 subs->last_delay -= processed;
1371 runtime->delay = subs->last_delay;
1372
1373 /*
1374 * Report when delay estimate is off by more than 2ms.
1375 * The error should be lower than 2ms since the estimate relies
1376 * on two reads of a counter updated every ms.
1377 */
1378 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1379 dev_dbg_ratelimited(&subs->dev->dev,
1380 "delay: estimated %d, actual %d\n",
1381 est_delay, subs->last_delay);
1382
1383 if (!subs->running) {
1384 /* update last_frame_number for delay counting here since
1385 * prepare_playback_urb won't be called during pause
1386 */
1387 subs->last_frame_number =
1388 usb_get_current_frame_number(subs->dev) & 0xff;
1389 }
1390
1391 out:
1392 spin_unlock_irqrestore(&subs->lock, flags);
1393 }
1394
1395 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1396 int cmd)
1397 {
1398 struct snd_usb_substream *subs = substream->runtime->private_data;
1399
1400 switch (cmd) {
1401 case SNDRV_PCM_TRIGGER_START:
1402 subs->trigger_tstamp_pending_update = true;
1403 fallthrough;
1404 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1405 snd_usb_endpoint_set_callback(subs->data_endpoint,
1406 prepare_playback_urb,
1407 retire_playback_urb,
1408 subs);
1409 subs->running = 1;
1410 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
1411 subs->cur_audiofmt->iface,
1412 subs->cur_audiofmt->altsetting);
1413 return 0;
1414 case SNDRV_PCM_TRIGGER_SUSPEND:
1415 case SNDRV_PCM_TRIGGER_STOP:
1416 stop_endpoints(subs);
1417 snd_usb_endpoint_set_callback(subs->data_endpoint,
1418 NULL, NULL, NULL);
1419 subs->running = 0;
1420 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
1421 subs->cur_audiofmt->iface,
1422 subs->cur_audiofmt->altsetting);
1423 return 0;
1424 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1425 /* keep retire_data_urb for delay calculation */
1426 snd_usb_endpoint_set_callback(subs->data_endpoint,
1427 NULL,
1428 retire_playback_urb,
1429 subs);
1430 subs->running = 0;
1431 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
1432 subs->cur_audiofmt->iface,
1433 subs->cur_audiofmt->altsetting);
1434 return 0;
1435 }
1436
1437 return -EINVAL;
1438 }
1439
1440 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1441 int cmd)
1442 {
1443 int err;
1444 struct snd_usb_substream *subs = substream->runtime->private_data;
1445
1446 switch (cmd) {
1447 case SNDRV_PCM_TRIGGER_START:
1448 err = start_endpoints(subs);
1449 if (err < 0)
1450 return err;
1451 fallthrough;
1452 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1453 snd_usb_endpoint_set_callback(subs->data_endpoint,
1454 NULL, retire_capture_urb,
1455 subs);
1456 subs->running = 1;
1457 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
1458 subs->cur_audiofmt->iface,
1459 subs->cur_audiofmt->altsetting);
1460 return 0;
1461 case SNDRV_PCM_TRIGGER_SUSPEND:
1462 case SNDRV_PCM_TRIGGER_STOP:
1463 stop_endpoints(subs);
1464 fallthrough;
1465 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1466 snd_usb_endpoint_set_callback(subs->data_endpoint,
1467 NULL, NULL, NULL);
1468 subs->running = 0;
1469 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
1470 subs->cur_audiofmt->iface,
1471 subs->cur_audiofmt->altsetting);
1472 return 0;
1473 }
1474
1475 return -EINVAL;
1476 }
1477
1478 static const struct snd_pcm_ops snd_usb_playback_ops = {
1479 .open = snd_usb_pcm_open,
1480 .close = snd_usb_pcm_close,
1481 .hw_params = snd_usb_hw_params,
1482 .hw_free = snd_usb_hw_free,
1483 .prepare = snd_usb_pcm_prepare,
1484 .trigger = snd_usb_substream_playback_trigger,
1485 .sync_stop = snd_usb_pcm_sync_stop,
1486 .pointer = snd_usb_pcm_pointer,
1487 };
1488
1489 static const struct snd_pcm_ops snd_usb_capture_ops = {
1490 .open = snd_usb_pcm_open,
1491 .close = snd_usb_pcm_close,
1492 .hw_params = snd_usb_hw_params,
1493 .hw_free = snd_usb_hw_free,
1494 .prepare = snd_usb_pcm_prepare,
1495 .trigger = snd_usb_substream_capture_trigger,
1496 .sync_stop = snd_usb_pcm_sync_stop,
1497 .pointer = snd_usb_pcm_pointer,
1498 };
1499
1500 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1501 {
1502 const struct snd_pcm_ops *ops;
1503
1504 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1505 &snd_usb_playback_ops : &snd_usb_capture_ops;
1506 snd_pcm_set_ops(pcm, stream, ops);
1507 }
1508
1509 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1510 {
1511 struct snd_pcm *pcm = subs->stream->pcm;
1512 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1513 struct device *dev = subs->dev->bus->controller;
1514
1515 if (snd_usb_use_vmalloc)
1516 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1517 NULL, 0, 0);
1518 else
1519 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1520 dev, 64*1024, 512*1024);
1521 }
Linux with added FPC-III support