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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[mirror_ubuntu-artful-kernel.git] / sound / soc / soc-pcm.c
1 /*
2 * soc-pcm.c -- ALSA SoC PCM
3 *
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Copyright 2005 Openedhand Ltd.
6 * Copyright (C) 2010 Slimlogic Ltd.
7 * Copyright (C) 2010 Texas Instruments Inc.
8 *
9 * Authors: Liam Girdwood <lrg@ti.com>
10 * Mark Brown <broonie@opensource.wolfsonmicro.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include <linux/export.h>
27 #include <linux/debugfs.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/soc-dpcm.h>
33 #include <sound/initval.h>
34
35 #define DPCM_MAX_BE_USERS 8
36
37 /*
38 * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
39 *
40 * Returns true if the DAI supports the indicated stream type.
41 */
42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
43 {
44 struct snd_soc_pcm_stream *codec_stream;
45
46 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
47 codec_stream = &dai->driver->playback;
48 else
49 codec_stream = &dai->driver->capture;
50
51 /* If the codec specifies any rate at all, it supports the stream. */
52 return codec_stream->rates;
53 }
54
55 /**
56 * snd_soc_runtime_activate() - Increment active count for PCM runtime components
57 * @rtd: ASoC PCM runtime that is activated
58 * @stream: Direction of the PCM stream
59 *
60 * Increments the active count for all the DAIs and components attached to a PCM
61 * runtime. Should typically be called when a stream is opened.
62 *
63 * Must be called with the rtd->pcm_mutex being held
64 */
65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
66 {
67 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
68 int i;
69
70 lockdep_assert_held(&rtd->pcm_mutex);
71
72 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
73 cpu_dai->playback_active++;
74 for (i = 0; i < rtd->num_codecs; i++)
75 rtd->codec_dais[i]->playback_active++;
76 } else {
77 cpu_dai->capture_active++;
78 for (i = 0; i < rtd->num_codecs; i++)
79 rtd->codec_dais[i]->capture_active++;
80 }
81
82 cpu_dai->active++;
83 cpu_dai->component->active++;
84 for (i = 0; i < rtd->num_codecs; i++) {
85 rtd->codec_dais[i]->active++;
86 rtd->codec_dais[i]->component->active++;
87 }
88 }
89
90 /**
91 * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
92 * @rtd: ASoC PCM runtime that is deactivated
93 * @stream: Direction of the PCM stream
94 *
95 * Decrements the active count for all the DAIs and components attached to a PCM
96 * runtime. Should typically be called when a stream is closed.
97 *
98 * Must be called with the rtd->pcm_mutex being held
99 */
100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
101 {
102 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
103 int i;
104
105 lockdep_assert_held(&rtd->pcm_mutex);
106
107 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
108 cpu_dai->playback_active--;
109 for (i = 0; i < rtd->num_codecs; i++)
110 rtd->codec_dais[i]->playback_active--;
111 } else {
112 cpu_dai->capture_active--;
113 for (i = 0; i < rtd->num_codecs; i++)
114 rtd->codec_dais[i]->capture_active--;
115 }
116
117 cpu_dai->active--;
118 cpu_dai->component->active--;
119 for (i = 0; i < rtd->num_codecs; i++) {
120 rtd->codec_dais[i]->component->active--;
121 rtd->codec_dais[i]->active--;
122 }
123 }
124
125 /**
126 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
127 * @rtd: The ASoC PCM runtime that should be checked.
128 *
129 * This function checks whether the power down delay should be ignored for a
130 * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
131 * been configured to ignore the delay, or if none of the components benefits
132 * from having the delay.
133 */
134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
135 {
136 int i;
137 bool ignore = true;
138
139 if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
140 return true;
141
142 for (i = 0; i < rtd->num_codecs; i++)
143 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
144
145 return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
146 }
147
148 /**
149 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
150 * @substream: the pcm substream
151 * @hw: the hardware parameters
152 *
153 * Sets the substream runtime hardware parameters.
154 */
155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
156 const struct snd_pcm_hardware *hw)
157 {
158 struct snd_pcm_runtime *runtime = substream->runtime;
159 runtime->hw.info = hw->info;
160 runtime->hw.formats = hw->formats;
161 runtime->hw.period_bytes_min = hw->period_bytes_min;
162 runtime->hw.period_bytes_max = hw->period_bytes_max;
163 runtime->hw.periods_min = hw->periods_min;
164 runtime->hw.periods_max = hw->periods_max;
165 runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
166 runtime->hw.fifo_size = hw->fifo_size;
167 return 0;
168 }
169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
170
171 /* DPCM stream event, send event to FE and all active BEs. */
172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
173 int event)
174 {
175 struct snd_soc_dpcm *dpcm;
176
177 list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
178
179 struct snd_soc_pcm_runtime *be = dpcm->be;
180
181 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
182 be->dai_link->name, event, dir);
183
184 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
185 (be->dpcm[dir].users >= 1))
186 continue;
187
188 snd_soc_dapm_stream_event(be, dir, event);
189 }
190
191 snd_soc_dapm_stream_event(fe, dir, event);
192
193 return 0;
194 }
195
196 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
197 struct snd_soc_dai *soc_dai)
198 {
199 struct snd_soc_pcm_runtime *rtd = substream->private_data;
200 int ret;
201
202 if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
203 rtd->dai_link->symmetric_rates)) {
204 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
205 soc_dai->rate);
206
207 ret = snd_pcm_hw_constraint_single(substream->runtime,
208 SNDRV_PCM_HW_PARAM_RATE,
209 soc_dai->rate);
210 if (ret < 0) {
211 dev_err(soc_dai->dev,
212 "ASoC: Unable to apply rate constraint: %d\n",
213 ret);
214 return ret;
215 }
216 }
217
218 if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
219 rtd->dai_link->symmetric_channels)) {
220 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
221 soc_dai->channels);
222
223 ret = snd_pcm_hw_constraint_single(substream->runtime,
224 SNDRV_PCM_HW_PARAM_CHANNELS,
225 soc_dai->channels);
226 if (ret < 0) {
227 dev_err(soc_dai->dev,
228 "ASoC: Unable to apply channel symmetry constraint: %d\n",
229 ret);
230 return ret;
231 }
232 }
233
234 if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
235 rtd->dai_link->symmetric_samplebits)) {
236 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
237 soc_dai->sample_bits);
238
239 ret = snd_pcm_hw_constraint_single(substream->runtime,
240 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
241 soc_dai->sample_bits);
242 if (ret < 0) {
243 dev_err(soc_dai->dev,
244 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
245 ret);
246 return ret;
247 }
248 }
249
250 return 0;
251 }
252
253 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
254 struct snd_pcm_hw_params *params)
255 {
256 struct snd_soc_pcm_runtime *rtd = substream->private_data;
257 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
258 unsigned int rate, channels, sample_bits, symmetry, i;
259
260 rate = params_rate(params);
261 channels = params_channels(params);
262 sample_bits = snd_pcm_format_physical_width(params_format(params));
263
264 /* reject unmatched parameters when applying symmetry */
265 symmetry = cpu_dai->driver->symmetric_rates ||
266 rtd->dai_link->symmetric_rates;
267
268 for (i = 0; i < rtd->num_codecs; i++)
269 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
270
271 if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
272 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
273 cpu_dai->rate, rate);
274 return -EINVAL;
275 }
276
277 symmetry = cpu_dai->driver->symmetric_channels ||
278 rtd->dai_link->symmetric_channels;
279
280 for (i = 0; i < rtd->num_codecs; i++)
281 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
282
283 if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
284 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
285 cpu_dai->channels, channels);
286 return -EINVAL;
287 }
288
289 symmetry = cpu_dai->driver->symmetric_samplebits ||
290 rtd->dai_link->symmetric_samplebits;
291
292 for (i = 0; i < rtd->num_codecs; i++)
293 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
294
295 if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
296 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
297 cpu_dai->sample_bits, sample_bits);
298 return -EINVAL;
299 }
300
301 return 0;
302 }
303
304 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
305 {
306 struct snd_soc_pcm_runtime *rtd = substream->private_data;
307 struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
308 struct snd_soc_dai_link *link = rtd->dai_link;
309 unsigned int symmetry, i;
310
311 symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
312 cpu_driver->symmetric_channels || link->symmetric_channels ||
313 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
314
315 for (i = 0; i < rtd->num_codecs; i++)
316 symmetry = symmetry ||
317 rtd->codec_dais[i]->driver->symmetric_rates ||
318 rtd->codec_dais[i]->driver->symmetric_channels ||
319 rtd->codec_dais[i]->driver->symmetric_samplebits;
320
321 return symmetry;
322 }
323
324 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
325 {
326 struct snd_soc_pcm_runtime *rtd = substream->private_data;
327 int ret;
328
329 if (!bits)
330 return;
331
332 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
333 if (ret != 0)
334 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
335 bits, ret);
336 }
337
338 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
339 {
340 struct snd_soc_pcm_runtime *rtd = substream->private_data;
341 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
342 struct snd_soc_dai *codec_dai;
343 int i;
344 unsigned int bits = 0, cpu_bits;
345
346 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
347 for (i = 0; i < rtd->num_codecs; i++) {
348 codec_dai = rtd->codec_dais[i];
349 if (codec_dai->driver->playback.sig_bits == 0) {
350 bits = 0;
351 break;
352 }
353 bits = max(codec_dai->driver->playback.sig_bits, bits);
354 }
355 cpu_bits = cpu_dai->driver->playback.sig_bits;
356 } else {
357 for (i = 0; i < rtd->num_codecs; i++) {
358 codec_dai = rtd->codec_dais[i];
359 if (codec_dai->driver->capture.sig_bits == 0) {
360 bits = 0;
361 break;
362 }
363 bits = max(codec_dai->driver->capture.sig_bits, bits);
364 }
365 cpu_bits = cpu_dai->driver->capture.sig_bits;
366 }
367
368 soc_pcm_set_msb(substream, bits);
369 soc_pcm_set_msb(substream, cpu_bits);
370 }
371
372 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
373 {
374 struct snd_pcm_runtime *runtime = substream->runtime;
375 struct snd_pcm_hardware *hw = &runtime->hw;
376 struct snd_soc_pcm_runtime *rtd = substream->private_data;
377 struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
378 struct snd_soc_dai_driver *codec_dai_drv;
379 struct snd_soc_pcm_stream *codec_stream;
380 struct snd_soc_pcm_stream *cpu_stream;
381 unsigned int chan_min = 0, chan_max = UINT_MAX;
382 unsigned int rate_min = 0, rate_max = UINT_MAX;
383 unsigned int rates = UINT_MAX;
384 u64 formats = ULLONG_MAX;
385 int i;
386
387 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
388 cpu_stream = &cpu_dai_drv->playback;
389 else
390 cpu_stream = &cpu_dai_drv->capture;
391
392 /* first calculate min/max only for CODECs in the DAI link */
393 for (i = 0; i < rtd->num_codecs; i++) {
394
395 /*
396 * Skip CODECs which don't support the current stream type.
397 * Otherwise, since the rate, channel, and format values will
398 * zero in that case, we would have no usable settings left,
399 * causing the resulting setup to fail.
400 * At least one CODEC should match, otherwise we should have
401 * bailed out on a higher level, since there would be no
402 * CODEC to support the transfer direction in that case.
403 */
404 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
405 substream->stream))
406 continue;
407
408 codec_dai_drv = rtd->codec_dais[i]->driver;
409 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
410 codec_stream = &codec_dai_drv->playback;
411 else
412 codec_stream = &codec_dai_drv->capture;
413 chan_min = max(chan_min, codec_stream->channels_min);
414 chan_max = min(chan_max, codec_stream->channels_max);
415 rate_min = max(rate_min, codec_stream->rate_min);
416 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
417 formats &= codec_stream->formats;
418 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
419 }
420
421 /*
422 * chan min/max cannot be enforced if there are multiple CODEC DAIs
423 * connected to a single CPU DAI, use CPU DAI's directly and let
424 * channel allocation be fixed up later
425 */
426 if (rtd->num_codecs > 1) {
427 chan_min = cpu_stream->channels_min;
428 chan_max = cpu_stream->channels_max;
429 }
430
431 hw->channels_min = max(chan_min, cpu_stream->channels_min);
432 hw->channels_max = min(chan_max, cpu_stream->channels_max);
433 if (hw->formats)
434 hw->formats &= formats & cpu_stream->formats;
435 else
436 hw->formats = formats & cpu_stream->formats;
437 hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
438
439 snd_pcm_limit_hw_rates(runtime);
440
441 hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
442 hw->rate_min = max(hw->rate_min, rate_min);
443 hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
444 hw->rate_max = min_not_zero(hw->rate_max, rate_max);
445 }
446
447 /*
448 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
449 * then initialized and any private data can be allocated. This also calls
450 * startup for the cpu DAI, platform, machine and codec DAI.
451 */
452 static int soc_pcm_open(struct snd_pcm_substream *substream)
453 {
454 struct snd_soc_pcm_runtime *rtd = substream->private_data;
455 struct snd_pcm_runtime *runtime = substream->runtime;
456 struct snd_soc_platform *platform = rtd->platform;
457 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
458 struct snd_soc_dai *codec_dai;
459 const char *codec_dai_name = "multicodec";
460 int i, ret = 0;
461
462 pinctrl_pm_select_default_state(cpu_dai->dev);
463 for (i = 0; i < rtd->num_codecs; i++)
464 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
465 pm_runtime_get_sync(cpu_dai->dev);
466 for (i = 0; i < rtd->num_codecs; i++)
467 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
468 pm_runtime_get_sync(platform->dev);
469
470 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
471
472 /* startup the audio subsystem */
473 if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
474 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
475 if (ret < 0) {
476 dev_err(cpu_dai->dev, "ASoC: can't open interface"
477 " %s: %d\n", cpu_dai->name, ret);
478 goto out;
479 }
480 }
481
482 if (platform->driver->ops && platform->driver->ops->open) {
483 ret = platform->driver->ops->open(substream);
484 if (ret < 0) {
485 dev_err(platform->dev, "ASoC: can't open platform"
486 " %s: %d\n", platform->component.name, ret);
487 goto platform_err;
488 }
489 }
490
491 for (i = 0; i < rtd->num_codecs; i++) {
492 codec_dai = rtd->codec_dais[i];
493 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
494 ret = codec_dai->driver->ops->startup(substream,
495 codec_dai);
496 if (ret < 0) {
497 dev_err(codec_dai->dev,
498 "ASoC: can't open codec %s: %d\n",
499 codec_dai->name, ret);
500 goto codec_dai_err;
501 }
502 }
503
504 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
505 codec_dai->tx_mask = 0;
506 else
507 codec_dai->rx_mask = 0;
508 }
509
510 if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
511 ret = rtd->dai_link->ops->startup(substream);
512 if (ret < 0) {
513 pr_err("ASoC: %s startup failed: %d\n",
514 rtd->dai_link->name, ret);
515 goto machine_err;
516 }
517 }
518
519 /* Dynamic PCM DAI links compat checks use dynamic capabilities */
520 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
521 goto dynamic;
522
523 /* Check that the codec and cpu DAIs are compatible */
524 soc_pcm_init_runtime_hw(substream);
525
526 if (rtd->num_codecs == 1)
527 codec_dai_name = rtd->codec_dai->name;
528
529 if (soc_pcm_has_symmetry(substream))
530 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
531
532 ret = -EINVAL;
533 if (!runtime->hw.rates) {
534 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
535 codec_dai_name, cpu_dai->name);
536 goto config_err;
537 }
538 if (!runtime->hw.formats) {
539 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
540 codec_dai_name, cpu_dai->name);
541 goto config_err;
542 }
543 if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
544 runtime->hw.channels_min > runtime->hw.channels_max) {
545 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
546 codec_dai_name, cpu_dai->name);
547 goto config_err;
548 }
549
550 soc_pcm_apply_msb(substream);
551
552 /* Symmetry only applies if we've already got an active stream. */
553 if (cpu_dai->active) {
554 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
555 if (ret != 0)
556 goto config_err;
557 }
558
559 for (i = 0; i < rtd->num_codecs; i++) {
560 if (rtd->codec_dais[i]->active) {
561 ret = soc_pcm_apply_symmetry(substream,
562 rtd->codec_dais[i]);
563 if (ret != 0)
564 goto config_err;
565 }
566 }
567
568 pr_debug("ASoC: %s <-> %s info:\n",
569 codec_dai_name, cpu_dai->name);
570 pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
571 pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
572 runtime->hw.channels_max);
573 pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
574 runtime->hw.rate_max);
575
576 dynamic:
577
578 snd_soc_runtime_activate(rtd, substream->stream);
579
580 mutex_unlock(&rtd->pcm_mutex);
581 return 0;
582
583 config_err:
584 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
585 rtd->dai_link->ops->shutdown(substream);
586
587 machine_err:
588 i = rtd->num_codecs;
589
590 codec_dai_err:
591 while (--i >= 0) {
592 codec_dai = rtd->codec_dais[i];
593 if (codec_dai->driver->ops->shutdown)
594 codec_dai->driver->ops->shutdown(substream, codec_dai);
595 }
596
597 if (platform->driver->ops && platform->driver->ops->close)
598 platform->driver->ops->close(substream);
599
600 platform_err:
601 if (cpu_dai->driver->ops->shutdown)
602 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
603 out:
604 mutex_unlock(&rtd->pcm_mutex);
605
606 pm_runtime_mark_last_busy(platform->dev);
607 pm_runtime_put_autosuspend(platform->dev);
608 for (i = 0; i < rtd->num_codecs; i++) {
609 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
610 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
611 }
612
613 pm_runtime_mark_last_busy(cpu_dai->dev);
614 pm_runtime_put_autosuspend(cpu_dai->dev);
615 for (i = 0; i < rtd->num_codecs; i++) {
616 if (!rtd->codec_dais[i]->active)
617 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
618 }
619 if (!cpu_dai->active)
620 pinctrl_pm_select_sleep_state(cpu_dai->dev);
621
622 return ret;
623 }
624
625 /*
626 * Power down the audio subsystem pmdown_time msecs after close is called.
627 * This is to ensure there are no pops or clicks in between any music tracks
628 * due to DAPM power cycling.
629 */
630 static void close_delayed_work(struct work_struct *work)
631 {
632 struct snd_soc_pcm_runtime *rtd =
633 container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
634 struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
635
636 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
637
638 dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
639 codec_dai->driver->playback.stream_name,
640 codec_dai->playback_active ? "active" : "inactive",
641 rtd->pop_wait ? "yes" : "no");
642
643 /* are we waiting on this codec DAI stream */
644 if (rtd->pop_wait == 1) {
645 rtd->pop_wait = 0;
646 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
647 SND_SOC_DAPM_STREAM_STOP);
648 }
649
650 mutex_unlock(&rtd->pcm_mutex);
651 }
652
653 /*
654 * Called by ALSA when a PCM substream is closed. Private data can be
655 * freed here. The cpu DAI, codec DAI, machine and platform are also
656 * shutdown.
657 */
658 static int soc_pcm_close(struct snd_pcm_substream *substream)
659 {
660 struct snd_soc_pcm_runtime *rtd = substream->private_data;
661 struct snd_soc_platform *platform = rtd->platform;
662 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
663 struct snd_soc_dai *codec_dai;
664 int i;
665
666 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
667
668 snd_soc_runtime_deactivate(rtd, substream->stream);
669
670 /* clear the corresponding DAIs rate when inactive */
671 if (!cpu_dai->active)
672 cpu_dai->rate = 0;
673
674 for (i = 0; i < rtd->num_codecs; i++) {
675 codec_dai = rtd->codec_dais[i];
676 if (!codec_dai->active)
677 codec_dai->rate = 0;
678 }
679
680 snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
681
682 if (cpu_dai->driver->ops->shutdown)
683 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
684
685 for (i = 0; i < rtd->num_codecs; i++) {
686 codec_dai = rtd->codec_dais[i];
687 if (codec_dai->driver->ops->shutdown)
688 codec_dai->driver->ops->shutdown(substream, codec_dai);
689 }
690
691 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
692 rtd->dai_link->ops->shutdown(substream);
693
694 if (platform->driver->ops && platform->driver->ops->close)
695 platform->driver->ops->close(substream);
696
697 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
698 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
699 /* powered down playback stream now */
700 snd_soc_dapm_stream_event(rtd,
701 SNDRV_PCM_STREAM_PLAYBACK,
702 SND_SOC_DAPM_STREAM_STOP);
703 } else {
704 /* start delayed pop wq here for playback streams */
705 rtd->pop_wait = 1;
706 queue_delayed_work(system_power_efficient_wq,
707 &rtd->delayed_work,
708 msecs_to_jiffies(rtd->pmdown_time));
709 }
710 } else {
711 /* capture streams can be powered down now */
712 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
713 SND_SOC_DAPM_STREAM_STOP);
714 }
715
716 mutex_unlock(&rtd->pcm_mutex);
717
718 pm_runtime_mark_last_busy(platform->dev);
719 pm_runtime_put_autosuspend(platform->dev);
720
721 for (i = 0; i < rtd->num_codecs; i++) {
722 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
723 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
724 }
725
726 pm_runtime_mark_last_busy(cpu_dai->dev);
727 pm_runtime_put_autosuspend(cpu_dai->dev);
728
729 for (i = 0; i < rtd->num_codecs; i++) {
730 if (!rtd->codec_dais[i]->active)
731 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
732 }
733 if (!cpu_dai->active)
734 pinctrl_pm_select_sleep_state(cpu_dai->dev);
735
736 return 0;
737 }
738
739 /*
740 * Called by ALSA when the PCM substream is prepared, can set format, sample
741 * rate, etc. This function is non atomic and can be called multiple times,
742 * it can refer to the runtime info.
743 */
744 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
745 {
746 struct snd_soc_pcm_runtime *rtd = substream->private_data;
747 struct snd_soc_platform *platform = rtd->platform;
748 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
749 struct snd_soc_dai *codec_dai;
750 int i, ret = 0;
751
752 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
753
754 if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
755 ret = rtd->dai_link->ops->prepare(substream);
756 if (ret < 0) {
757 dev_err(rtd->card->dev, "ASoC: machine prepare error:"
758 " %d\n", ret);
759 goto out;
760 }
761 }
762
763 if (platform->driver->ops && platform->driver->ops->prepare) {
764 ret = platform->driver->ops->prepare(substream);
765 if (ret < 0) {
766 dev_err(platform->dev, "ASoC: platform prepare error:"
767 " %d\n", ret);
768 goto out;
769 }
770 }
771
772 for (i = 0; i < rtd->num_codecs; i++) {
773 codec_dai = rtd->codec_dais[i];
774 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
775 ret = codec_dai->driver->ops->prepare(substream,
776 codec_dai);
777 if (ret < 0) {
778 dev_err(codec_dai->dev,
779 "ASoC: codec DAI prepare error: %d\n",
780 ret);
781 goto out;
782 }
783 }
784 }
785
786 if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
787 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
788 if (ret < 0) {
789 dev_err(cpu_dai->dev,
790 "ASoC: cpu DAI prepare error: %d\n", ret);
791 goto out;
792 }
793 }
794
795 /* cancel any delayed stream shutdown that is pending */
796 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
797 rtd->pop_wait) {
798 rtd->pop_wait = 0;
799 cancel_delayed_work(&rtd->delayed_work);
800 }
801
802 snd_soc_dapm_stream_event(rtd, substream->stream,
803 SND_SOC_DAPM_STREAM_START);
804
805 for (i = 0; i < rtd->num_codecs; i++)
806 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
807 substream->stream);
808 snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
809
810 out:
811 mutex_unlock(&rtd->pcm_mutex);
812 return ret;
813 }
814
815 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
816 unsigned int mask)
817 {
818 struct snd_interval *interval;
819 int channels = hweight_long(mask);
820
821 interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
822 interval->min = channels;
823 interval->max = channels;
824 }
825
826 int soc_dai_hw_params(struct snd_pcm_substream *substream,
827 struct snd_pcm_hw_params *params,
828 struct snd_soc_dai *dai)
829 {
830 int ret;
831
832 if (dai->driver->ops && dai->driver->ops->hw_params) {
833 ret = dai->driver->ops->hw_params(substream, params, dai);
834 if (ret < 0) {
835 dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
836 dai->name, ret);
837 return ret;
838 }
839 }
840
841 return 0;
842 }
843
844 /*
845 * Called by ALSA when the hardware params are set by application. This
846 * function can also be called multiple times and can allocate buffers
847 * (using snd_pcm_lib_* ). It's non-atomic.
848 */
849 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
850 struct snd_pcm_hw_params *params)
851 {
852 struct snd_soc_pcm_runtime *rtd = substream->private_data;
853 struct snd_soc_platform *platform = rtd->platform;
854 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
855 int i, ret = 0;
856
857 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
858
859 ret = soc_pcm_params_symmetry(substream, params);
860 if (ret)
861 goto out;
862
863 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
864 ret = rtd->dai_link->ops->hw_params(substream, params);
865 if (ret < 0) {
866 dev_err(rtd->card->dev, "ASoC: machine hw_params"
867 " failed: %d\n", ret);
868 goto out;
869 }
870 }
871
872 for (i = 0; i < rtd->num_codecs; i++) {
873 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
874 struct snd_pcm_hw_params codec_params;
875
876 /*
877 * Skip CODECs which don't support the current stream type,
878 * the idea being that if a CODEC is not used for the currently
879 * set up transfer direction, it should not need to be
880 * configured, especially since the configuration used might
881 * not even be supported by that CODEC. There may be cases
882 * however where a CODEC needs to be set up although it is
883 * actually not being used for the transfer, e.g. if a
884 * capture-only CODEC is acting as an LRCLK and/or BCLK master
885 * for the DAI link including a playback-only CODEC.
886 * If this becomes necessary, we will have to augment the
887 * machine driver setup with information on how to act, so
888 * we can do the right thing here.
889 */
890 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
891 continue;
892
893 /* copy params for each codec */
894 codec_params = *params;
895
896 /* fixup params based on TDM slot masks */
897 if (codec_dai->tx_mask)
898 soc_pcm_codec_params_fixup(&codec_params,
899 codec_dai->tx_mask);
900 if (codec_dai->rx_mask)
901 soc_pcm_codec_params_fixup(&codec_params,
902 codec_dai->rx_mask);
903
904 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
905 if(ret < 0)
906 goto codec_err;
907
908 codec_dai->rate = params_rate(&codec_params);
909 codec_dai->channels = params_channels(&codec_params);
910 codec_dai->sample_bits = snd_pcm_format_physical_width(
911 params_format(&codec_params));
912 }
913
914 ret = soc_dai_hw_params(substream, params, cpu_dai);
915 if (ret < 0)
916 goto interface_err;
917
918 if (platform->driver->ops && platform->driver->ops->hw_params) {
919 ret = platform->driver->ops->hw_params(substream, params);
920 if (ret < 0) {
921 dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
922 platform->component.name, ret);
923 goto platform_err;
924 }
925 }
926
927 /* store the parameters for each DAIs */
928 cpu_dai->rate = params_rate(params);
929 cpu_dai->channels = params_channels(params);
930 cpu_dai->sample_bits =
931 snd_pcm_format_physical_width(params_format(params));
932
933 out:
934 mutex_unlock(&rtd->pcm_mutex);
935 return ret;
936
937 platform_err:
938 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
939 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
940
941 interface_err:
942 i = rtd->num_codecs;
943
944 codec_err:
945 while (--i >= 0) {
946 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
947 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
948 codec_dai->driver->ops->hw_free(substream, codec_dai);
949 codec_dai->rate = 0;
950 }
951
952 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
953 rtd->dai_link->ops->hw_free(substream);
954
955 mutex_unlock(&rtd->pcm_mutex);
956 return ret;
957 }
958
959 /*
960 * Frees resources allocated by hw_params, can be called multiple times
961 */
962 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
963 {
964 struct snd_soc_pcm_runtime *rtd = substream->private_data;
965 struct snd_soc_platform *platform = rtd->platform;
966 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
967 struct snd_soc_dai *codec_dai;
968 bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
969 int i;
970
971 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
972
973 /* clear the corresponding DAIs parameters when going to be inactive */
974 if (cpu_dai->active == 1) {
975 cpu_dai->rate = 0;
976 cpu_dai->channels = 0;
977 cpu_dai->sample_bits = 0;
978 }
979
980 for (i = 0; i < rtd->num_codecs; i++) {
981 codec_dai = rtd->codec_dais[i];
982 if (codec_dai->active == 1) {
983 codec_dai->rate = 0;
984 codec_dai->channels = 0;
985 codec_dai->sample_bits = 0;
986 }
987 }
988
989 /* apply codec digital mute */
990 for (i = 0; i < rtd->num_codecs; i++) {
991 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
992 (!playback && rtd->codec_dais[i]->capture_active == 1))
993 snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
994 substream->stream);
995 }
996
997 /* free any machine hw params */
998 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
999 rtd->dai_link->ops->hw_free(substream);
1000
1001 /* free any DMA resources */
1002 if (platform->driver->ops && platform->driver->ops->hw_free)
1003 platform->driver->ops->hw_free(substream);
1004
1005 /* now free hw params for the DAIs */
1006 for (i = 0; i < rtd->num_codecs; i++) {
1007 codec_dai = rtd->codec_dais[i];
1008 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1009 codec_dai->driver->ops->hw_free(substream, codec_dai);
1010 }
1011
1012 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1013 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1014
1015 mutex_unlock(&rtd->pcm_mutex);
1016 return 0;
1017 }
1018
1019 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1020 {
1021 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1022 struct snd_soc_platform *platform = rtd->platform;
1023 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1024 struct snd_soc_dai *codec_dai;
1025 int i, ret;
1026
1027 for (i = 0; i < rtd->num_codecs; i++) {
1028 codec_dai = rtd->codec_dais[i];
1029 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1030 ret = codec_dai->driver->ops->trigger(substream,
1031 cmd, codec_dai);
1032 if (ret < 0)
1033 return ret;
1034 }
1035 }
1036
1037 if (platform->driver->ops && platform->driver->ops->trigger) {
1038 ret = platform->driver->ops->trigger(substream, cmd);
1039 if (ret < 0)
1040 return ret;
1041 }
1042
1043 if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1044 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1045 if (ret < 0)
1046 return ret;
1047 }
1048
1049 if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1050 ret = rtd->dai_link->ops->trigger(substream, cmd);
1051 if (ret < 0)
1052 return ret;
1053 }
1054
1055 return 0;
1056 }
1057
1058 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1059 int cmd)
1060 {
1061 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1062 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1063 struct snd_soc_dai *codec_dai;
1064 int i, ret;
1065
1066 for (i = 0; i < rtd->num_codecs; i++) {
1067 codec_dai = rtd->codec_dais[i];
1068 if (codec_dai->driver->ops &&
1069 codec_dai->driver->ops->bespoke_trigger) {
1070 ret = codec_dai->driver->ops->bespoke_trigger(substream,
1071 cmd, codec_dai);
1072 if (ret < 0)
1073 return ret;
1074 }
1075 }
1076
1077 if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1078 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1079 if (ret < 0)
1080 return ret;
1081 }
1082 return 0;
1083 }
1084 /*
1085 * soc level wrapper for pointer callback
1086 * If cpu_dai, codec_dai, platform driver has the delay callback, than
1087 * the runtime->delay will be updated accordingly.
1088 */
1089 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1090 {
1091 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1092 struct snd_soc_platform *platform = rtd->platform;
1093 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1094 struct snd_soc_dai *codec_dai;
1095 struct snd_pcm_runtime *runtime = substream->runtime;
1096 snd_pcm_uframes_t offset = 0;
1097 snd_pcm_sframes_t delay = 0;
1098 snd_pcm_sframes_t codec_delay = 0;
1099 int i;
1100
1101 if (platform->driver->ops && platform->driver->ops->pointer)
1102 offset = platform->driver->ops->pointer(substream);
1103
1104 if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1105 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1106
1107 for (i = 0; i < rtd->num_codecs; i++) {
1108 codec_dai = rtd->codec_dais[i];
1109 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1110 codec_delay = max(codec_delay,
1111 codec_dai->driver->ops->delay(substream,
1112 codec_dai));
1113 }
1114 delay += codec_delay;
1115
1116 runtime->delay = delay;
1117
1118 return offset;
1119 }
1120
1121 /* connect a FE and BE */
1122 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1123 struct snd_soc_pcm_runtime *be, int stream)
1124 {
1125 struct snd_soc_dpcm *dpcm;
1126
1127 /* only add new dpcms */
1128 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1129 if (dpcm->be == be && dpcm->fe == fe)
1130 return 0;
1131 }
1132
1133 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1134 if (!dpcm)
1135 return -ENOMEM;
1136
1137 dpcm->be = be;
1138 dpcm->fe = fe;
1139 be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1140 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1141 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1142 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1143
1144 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1145 stream ? "capture" : "playback", fe->dai_link->name,
1146 stream ? "<-" : "->", be->dai_link->name);
1147
1148 #ifdef CONFIG_DEBUG_FS
1149 if (fe->debugfs_dpcm_root)
1150 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1151 fe->debugfs_dpcm_root, &dpcm->state);
1152 #endif
1153 return 1;
1154 }
1155
1156 /* reparent a BE onto another FE */
1157 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1158 struct snd_soc_pcm_runtime *be, int stream)
1159 {
1160 struct snd_soc_dpcm *dpcm;
1161 struct snd_pcm_substream *fe_substream, *be_substream;
1162
1163 /* reparent if BE is connected to other FEs */
1164 if (!be->dpcm[stream].users)
1165 return;
1166
1167 be_substream = snd_soc_dpcm_get_substream(be, stream);
1168
1169 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1170 if (dpcm->fe == fe)
1171 continue;
1172
1173 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1174 stream ? "capture" : "playback",
1175 dpcm->fe->dai_link->name,
1176 stream ? "<-" : "->", dpcm->be->dai_link->name);
1177
1178 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1179 be_substream->runtime = fe_substream->runtime;
1180 break;
1181 }
1182 }
1183
1184 /* disconnect a BE and FE */
1185 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1186 {
1187 struct snd_soc_dpcm *dpcm, *d;
1188
1189 list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1190 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1191 stream ? "capture" : "playback",
1192 dpcm->be->dai_link->name);
1193
1194 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1195 continue;
1196
1197 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1198 stream ? "capture" : "playback", fe->dai_link->name,
1199 stream ? "<-" : "->", dpcm->be->dai_link->name);
1200
1201 /* BEs still alive need new FE */
1202 dpcm_be_reparent(fe, dpcm->be, stream);
1203
1204 #ifdef CONFIG_DEBUG_FS
1205 debugfs_remove(dpcm->debugfs_state);
1206 #endif
1207 list_del(&dpcm->list_be);
1208 list_del(&dpcm->list_fe);
1209 kfree(dpcm);
1210 }
1211 }
1212
1213 /* get BE for DAI widget and stream */
1214 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1215 struct snd_soc_dapm_widget *widget, int stream)
1216 {
1217 struct snd_soc_pcm_runtime *be;
1218 int i;
1219
1220 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1221 list_for_each_entry(be, &card->rtd_list, list) {
1222
1223 if (!be->dai_link->no_pcm)
1224 continue;
1225
1226 if (be->cpu_dai->playback_widget == widget)
1227 return be;
1228
1229 for (i = 0; i < be->num_codecs; i++) {
1230 struct snd_soc_dai *dai = be->codec_dais[i];
1231 if (dai->playback_widget == widget)
1232 return be;
1233 }
1234 }
1235 } else {
1236
1237 list_for_each_entry(be, &card->rtd_list, list) {
1238
1239 if (!be->dai_link->no_pcm)
1240 continue;
1241
1242 if (be->cpu_dai->capture_widget == widget)
1243 return be;
1244
1245 for (i = 0; i < be->num_codecs; i++) {
1246 struct snd_soc_dai *dai = be->codec_dais[i];
1247 if (dai->capture_widget == widget)
1248 return be;
1249 }
1250 }
1251 }
1252
1253 dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1254 stream ? "capture" : "playback", widget->name);
1255 return NULL;
1256 }
1257
1258 static inline struct snd_soc_dapm_widget *
1259 dai_get_widget(struct snd_soc_dai *dai, int stream)
1260 {
1261 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1262 return dai->playback_widget;
1263 else
1264 return dai->capture_widget;
1265 }
1266
1267 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1268 struct snd_soc_dapm_widget *widget)
1269 {
1270 int i;
1271
1272 for (i = 0; i < list->num_widgets; i++) {
1273 if (widget == list->widgets[i])
1274 return 1;
1275 }
1276
1277 return 0;
1278 }
1279
1280 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1281 enum snd_soc_dapm_direction dir)
1282 {
1283 struct snd_soc_card *card = widget->dapm->card;
1284 struct snd_soc_pcm_runtime *rtd;
1285 int i;
1286
1287 if (dir == SND_SOC_DAPM_DIR_OUT) {
1288 list_for_each_entry(rtd, &card->rtd_list, list) {
1289 if (!rtd->dai_link->no_pcm)
1290 continue;
1291
1292 if (rtd->cpu_dai->playback_widget == widget)
1293 return true;
1294
1295 for (i = 0; i < rtd->num_codecs; ++i) {
1296 struct snd_soc_dai *dai = rtd->codec_dais[i];
1297 if (dai->playback_widget == widget)
1298 return true;
1299 }
1300 }
1301 } else { /* SND_SOC_DAPM_DIR_IN */
1302 list_for_each_entry(rtd, &card->rtd_list, list) {
1303 if (!rtd->dai_link->no_pcm)
1304 continue;
1305
1306 if (rtd->cpu_dai->capture_widget == widget)
1307 return true;
1308
1309 for (i = 0; i < rtd->num_codecs; ++i) {
1310 struct snd_soc_dai *dai = rtd->codec_dais[i];
1311 if (dai->capture_widget == widget)
1312 return true;
1313 }
1314 }
1315 }
1316
1317 return false;
1318 }
1319
1320 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1321 int stream, struct snd_soc_dapm_widget_list **list)
1322 {
1323 struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1324 int paths;
1325
1326 /* get number of valid DAI paths and their widgets */
1327 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1328 dpcm_end_walk_at_be);
1329
1330 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1331 stream ? "capture" : "playback");
1332
1333 return paths;
1334 }
1335
1336 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1337 struct snd_soc_dapm_widget_list **list_)
1338 {
1339 struct snd_soc_dpcm *dpcm;
1340 struct snd_soc_dapm_widget_list *list = *list_;
1341 struct snd_soc_dapm_widget *widget;
1342 int prune = 0;
1343
1344 /* Destroy any old FE <--> BE connections */
1345 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1346 unsigned int i;
1347
1348 /* is there a valid CPU DAI widget for this BE */
1349 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1350
1351 /* prune the BE if it's no longer in our active list */
1352 if (widget && widget_in_list(list, widget))
1353 continue;
1354
1355 /* is there a valid CODEC DAI widget for this BE */
1356 for (i = 0; i < dpcm->be->num_codecs; i++) {
1357 struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1358 widget = dai_get_widget(dai, stream);
1359
1360 /* prune the BE if it's no longer in our active list */
1361 if (widget && widget_in_list(list, widget))
1362 continue;
1363 }
1364
1365 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1366 stream ? "capture" : "playback",
1367 dpcm->be->dai_link->name, fe->dai_link->name);
1368 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1369 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1370 prune++;
1371 }
1372
1373 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1374 return prune;
1375 }
1376
1377 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1378 struct snd_soc_dapm_widget_list **list_)
1379 {
1380 struct snd_soc_card *card = fe->card;
1381 struct snd_soc_dapm_widget_list *list = *list_;
1382 struct snd_soc_pcm_runtime *be;
1383 int i, new = 0, err;
1384
1385 /* Create any new FE <--> BE connections */
1386 for (i = 0; i < list->num_widgets; i++) {
1387
1388 switch (list->widgets[i]->id) {
1389 case snd_soc_dapm_dai_in:
1390 if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1391 continue;
1392 break;
1393 case snd_soc_dapm_dai_out:
1394 if (stream != SNDRV_PCM_STREAM_CAPTURE)
1395 continue;
1396 break;
1397 default:
1398 continue;
1399 }
1400
1401 /* is there a valid BE rtd for this widget */
1402 be = dpcm_get_be(card, list->widgets[i], stream);
1403 if (!be) {
1404 dev_err(fe->dev, "ASoC: no BE found for %s\n",
1405 list->widgets[i]->name);
1406 continue;
1407 }
1408
1409 /* make sure BE is a real BE */
1410 if (!be->dai_link->no_pcm)
1411 continue;
1412
1413 /* don't connect if FE is not running */
1414 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1415 continue;
1416
1417 /* newly connected FE and BE */
1418 err = dpcm_be_connect(fe, be, stream);
1419 if (err < 0) {
1420 dev_err(fe->dev, "ASoC: can't connect %s\n",
1421 list->widgets[i]->name);
1422 break;
1423 } else if (err == 0) /* already connected */
1424 continue;
1425
1426 /* new */
1427 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1428 new++;
1429 }
1430
1431 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1432 return new;
1433 }
1434
1435 /*
1436 * Find the corresponding BE DAIs that source or sink audio to this
1437 * FE substream.
1438 */
1439 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1440 int stream, struct snd_soc_dapm_widget_list **list, int new)
1441 {
1442 if (new)
1443 return dpcm_add_paths(fe, stream, list);
1444 else
1445 return dpcm_prune_paths(fe, stream, list);
1446 }
1447
1448 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1449 {
1450 struct snd_soc_dpcm *dpcm;
1451
1452 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1453 dpcm->be->dpcm[stream].runtime_update =
1454 SND_SOC_DPCM_UPDATE_NO;
1455 }
1456
1457 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1458 int stream)
1459 {
1460 struct snd_soc_dpcm *dpcm;
1461
1462 /* disable any enabled and non active backends */
1463 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1464
1465 struct snd_soc_pcm_runtime *be = dpcm->be;
1466 struct snd_pcm_substream *be_substream =
1467 snd_soc_dpcm_get_substream(be, stream);
1468
1469 if (be->dpcm[stream].users == 0)
1470 dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1471 stream ? "capture" : "playback",
1472 be->dpcm[stream].state);
1473
1474 if (--be->dpcm[stream].users != 0)
1475 continue;
1476
1477 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1478 continue;
1479
1480 soc_pcm_close(be_substream);
1481 be_substream->runtime = NULL;
1482 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1483 }
1484 }
1485
1486 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1487 {
1488 struct snd_soc_dpcm *dpcm;
1489 int err, count = 0;
1490
1491 /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1492 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1493
1494 struct snd_soc_pcm_runtime *be = dpcm->be;
1495 struct snd_pcm_substream *be_substream =
1496 snd_soc_dpcm_get_substream(be, stream);
1497
1498 if (!be_substream) {
1499 dev_err(be->dev, "ASoC: no backend %s stream\n",
1500 stream ? "capture" : "playback");
1501 continue;
1502 }
1503
1504 /* is this op for this BE ? */
1505 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1506 continue;
1507
1508 /* first time the dpcm is open ? */
1509 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1510 dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1511 stream ? "capture" : "playback",
1512 be->dpcm[stream].state);
1513
1514 if (be->dpcm[stream].users++ != 0)
1515 continue;
1516
1517 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1518 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1519 continue;
1520
1521 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1522 stream ? "capture" : "playback", be->dai_link->name);
1523
1524 be_substream->runtime = be->dpcm[stream].runtime;
1525 err = soc_pcm_open(be_substream);
1526 if (err < 0) {
1527 dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1528 be->dpcm[stream].users--;
1529 if (be->dpcm[stream].users < 0)
1530 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1531 stream ? "capture" : "playback",
1532 be->dpcm[stream].state);
1533
1534 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1535 goto unwind;
1536 }
1537
1538 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1539 count++;
1540 }
1541
1542 return count;
1543
1544 unwind:
1545 /* disable any enabled and non active backends */
1546 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1547 struct snd_soc_pcm_runtime *be = dpcm->be;
1548 struct snd_pcm_substream *be_substream =
1549 snd_soc_dpcm_get_substream(be, stream);
1550
1551 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1552 continue;
1553
1554 if (be->dpcm[stream].users == 0)
1555 dev_err(be->dev, "ASoC: no users %s at close %d\n",
1556 stream ? "capture" : "playback",
1557 be->dpcm[stream].state);
1558
1559 if (--be->dpcm[stream].users != 0)
1560 continue;
1561
1562 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1563 continue;
1564
1565 soc_pcm_close(be_substream);
1566 be_substream->runtime = NULL;
1567 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1568 }
1569
1570 return err;
1571 }
1572
1573 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1574 struct snd_soc_pcm_stream *stream,
1575 u64 formats)
1576 {
1577 runtime->hw.rate_min = stream->rate_min;
1578 runtime->hw.rate_max = stream->rate_max;
1579 runtime->hw.channels_min = stream->channels_min;
1580 runtime->hw.channels_max = stream->channels_max;
1581 if (runtime->hw.formats)
1582 runtime->hw.formats &= formats & stream->formats;
1583 else
1584 runtime->hw.formats = formats & stream->formats;
1585 runtime->hw.rates = stream->rates;
1586 }
1587
1588 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1589 {
1590 struct snd_soc_pcm_runtime *fe = substream->private_data;
1591 struct snd_soc_dpcm *dpcm;
1592 u64 formats = ULLONG_MAX;
1593 int stream = substream->stream;
1594
1595 if (!fe->dai_link->dpcm_merged_format)
1596 return formats;
1597
1598 /*
1599 * It returns merged BE codec format
1600 * if FE want to use it (= dpcm_merged_format)
1601 */
1602
1603 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1604 struct snd_soc_pcm_runtime *be = dpcm->be;
1605 struct snd_soc_dai_driver *codec_dai_drv;
1606 struct snd_soc_pcm_stream *codec_stream;
1607 int i;
1608
1609 for (i = 0; i < be->num_codecs; i++) {
1610 codec_dai_drv = be->codec_dais[i]->driver;
1611 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1612 codec_stream = &codec_dai_drv->playback;
1613 else
1614 codec_stream = &codec_dai_drv->capture;
1615
1616 formats &= codec_stream->formats;
1617 }
1618 }
1619
1620 return formats;
1621 }
1622
1623 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1624 {
1625 struct snd_pcm_runtime *runtime = substream->runtime;
1626 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1627 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1628 struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1629 u64 format = dpcm_runtime_base_format(substream);
1630
1631 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1632 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1633 else
1634 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1635 }
1636
1637 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1638
1639 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1640 * for avoiding the race with trigger callback.
1641 * If the state is unset and a trigger is pending while the previous operation,
1642 * process the pending trigger action here.
1643 */
1644 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1645 int stream, enum snd_soc_dpcm_update state)
1646 {
1647 struct snd_pcm_substream *substream =
1648 snd_soc_dpcm_get_substream(fe, stream);
1649
1650 snd_pcm_stream_lock_irq(substream);
1651 if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1652 dpcm_fe_dai_do_trigger(substream,
1653 fe->dpcm[stream].trigger_pending - 1);
1654 fe->dpcm[stream].trigger_pending = 0;
1655 }
1656 fe->dpcm[stream].runtime_update = state;
1657 snd_pcm_stream_unlock_irq(substream);
1658 }
1659
1660 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1661 int stream)
1662 {
1663 struct snd_soc_dpcm *dpcm;
1664 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1665 struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1666 int err;
1667
1668 /* apply symmetry for FE */
1669 if (soc_pcm_has_symmetry(fe_substream))
1670 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1671
1672 /* Symmetry only applies if we've got an active stream. */
1673 if (fe_cpu_dai->active) {
1674 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1675 if (err < 0)
1676 return err;
1677 }
1678
1679 /* apply symmetry for BE */
1680 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1681 struct snd_soc_pcm_runtime *be = dpcm->be;
1682 struct snd_pcm_substream *be_substream =
1683 snd_soc_dpcm_get_substream(be, stream);
1684 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1685 int i;
1686
1687 if (rtd->dai_link->be_hw_params_fixup)
1688 continue;
1689
1690 if (soc_pcm_has_symmetry(be_substream))
1691 be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1692
1693 /* Symmetry only applies if we've got an active stream. */
1694 if (rtd->cpu_dai->active) {
1695 err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1696 if (err < 0)
1697 return err;
1698 }
1699
1700 for (i = 0; i < rtd->num_codecs; i++) {
1701 if (rtd->codec_dais[i]->active) {
1702 err = soc_pcm_apply_symmetry(be_substream,
1703 rtd->codec_dais[i]);
1704 if (err < 0)
1705 return err;
1706 }
1707 }
1708 }
1709
1710 return 0;
1711 }
1712
1713 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1714 {
1715 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1716 struct snd_pcm_runtime *runtime = fe_substream->runtime;
1717 int stream = fe_substream->stream, ret = 0;
1718
1719 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1720
1721 ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1722 if (ret < 0) {
1723 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1724 goto be_err;
1725 }
1726
1727 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1728
1729 /* start the DAI frontend */
1730 ret = soc_pcm_open(fe_substream);
1731 if (ret < 0) {
1732 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1733 goto unwind;
1734 }
1735
1736 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1737
1738 dpcm_set_fe_runtime(fe_substream);
1739 snd_pcm_limit_hw_rates(runtime);
1740
1741 ret = dpcm_apply_symmetry(fe_substream, stream);
1742 if (ret < 0) {
1743 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1744 ret);
1745 goto unwind;
1746 }
1747
1748 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1749 return 0;
1750
1751 unwind:
1752 dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1753 be_err:
1754 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1755 return ret;
1756 }
1757
1758 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1759 {
1760 struct snd_soc_dpcm *dpcm;
1761
1762 /* only shutdown BEs that are either sinks or sources to this FE DAI */
1763 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1764
1765 struct snd_soc_pcm_runtime *be = dpcm->be;
1766 struct snd_pcm_substream *be_substream =
1767 snd_soc_dpcm_get_substream(be, stream);
1768
1769 /* is this op for this BE ? */
1770 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1771 continue;
1772
1773 if (be->dpcm[stream].users == 0)
1774 dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1775 stream ? "capture" : "playback",
1776 be->dpcm[stream].state);
1777
1778 if (--be->dpcm[stream].users != 0)
1779 continue;
1780
1781 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1782 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1783 continue;
1784
1785 dev_dbg(be->dev, "ASoC: close BE %s\n",
1786 be->dai_link->name);
1787
1788 soc_pcm_close(be_substream);
1789 be_substream->runtime = NULL;
1790
1791 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1792 }
1793 return 0;
1794 }
1795
1796 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1797 {
1798 struct snd_soc_pcm_runtime *fe = substream->private_data;
1799 int stream = substream->stream;
1800
1801 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1802
1803 /* shutdown the BEs */
1804 dpcm_be_dai_shutdown(fe, substream->stream);
1805
1806 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1807
1808 /* now shutdown the frontend */
1809 soc_pcm_close(substream);
1810
1811 /* run the stream event for each BE */
1812 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1813
1814 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1815 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1816 return 0;
1817 }
1818
1819 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1820 {
1821 struct snd_soc_dpcm *dpcm;
1822
1823 /* only hw_params backends that are either sinks or sources
1824 * to this frontend DAI */
1825 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1826
1827 struct snd_soc_pcm_runtime *be = dpcm->be;
1828 struct snd_pcm_substream *be_substream =
1829 snd_soc_dpcm_get_substream(be, stream);
1830
1831 /* is this op for this BE ? */
1832 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1833 continue;
1834
1835 /* only free hw when no longer used - check all FEs */
1836 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1837 continue;
1838
1839 /* do not free hw if this BE is used by other FE */
1840 if (be->dpcm[stream].users > 1)
1841 continue;
1842
1843 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1844 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1845 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1846 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1847 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1848 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1849 continue;
1850
1851 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1852 be->dai_link->name);
1853
1854 soc_pcm_hw_free(be_substream);
1855
1856 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1857 }
1858
1859 return 0;
1860 }
1861
1862 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1863 {
1864 struct snd_soc_pcm_runtime *fe = substream->private_data;
1865 int err, stream = substream->stream;
1866
1867 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1868 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1869
1870 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1871
1872 /* call hw_free on the frontend */
1873 err = soc_pcm_hw_free(substream);
1874 if (err < 0)
1875 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1876 fe->dai_link->name);
1877
1878 /* only hw_params backends that are either sinks or sources
1879 * to this frontend DAI */
1880 err = dpcm_be_dai_hw_free(fe, stream);
1881
1882 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1883 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1884
1885 mutex_unlock(&fe->card->mutex);
1886 return 0;
1887 }
1888
1889 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1890 {
1891 struct snd_soc_dpcm *dpcm;
1892 int ret;
1893
1894 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1895
1896 struct snd_soc_pcm_runtime *be = dpcm->be;
1897 struct snd_pcm_substream *be_substream =
1898 snd_soc_dpcm_get_substream(be, stream);
1899
1900 /* is this op for this BE ? */
1901 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1902 continue;
1903
1904 /* copy params for each dpcm */
1905 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1906 sizeof(struct snd_pcm_hw_params));
1907
1908 /* perform any hw_params fixups */
1909 if (be->dai_link->be_hw_params_fixup) {
1910 ret = be->dai_link->be_hw_params_fixup(be,
1911 &dpcm->hw_params);
1912 if (ret < 0) {
1913 dev_err(be->dev,
1914 "ASoC: hw_params BE fixup failed %d\n",
1915 ret);
1916 goto unwind;
1917 }
1918 }
1919
1920 /* only allow hw_params() if no connected FEs are running */
1921 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1922 continue;
1923
1924 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1925 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1926 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1927 continue;
1928
1929 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1930 be->dai_link->name);
1931
1932 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1933 if (ret < 0) {
1934 dev_err(dpcm->be->dev,
1935 "ASoC: hw_params BE failed %d\n", ret);
1936 goto unwind;
1937 }
1938
1939 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1940 }
1941 return 0;
1942
1943 unwind:
1944 /* disable any enabled and non active backends */
1945 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1946 struct snd_soc_pcm_runtime *be = dpcm->be;
1947 struct snd_pcm_substream *be_substream =
1948 snd_soc_dpcm_get_substream(be, stream);
1949
1950 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1951 continue;
1952
1953 /* only allow hw_free() if no connected FEs are running */
1954 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1955 continue;
1956
1957 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1958 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1959 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1960 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1961 continue;
1962
1963 soc_pcm_hw_free(be_substream);
1964 }
1965
1966 return ret;
1967 }
1968
1969 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1970 struct snd_pcm_hw_params *params)
1971 {
1972 struct snd_soc_pcm_runtime *fe = substream->private_data;
1973 int ret, stream = substream->stream;
1974
1975 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1976 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1977
1978 memcpy(&fe->dpcm[substream->stream].hw_params, params,
1979 sizeof(struct snd_pcm_hw_params));
1980 ret = dpcm_be_dai_hw_params(fe, substream->stream);
1981 if (ret < 0) {
1982 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1983 goto out;
1984 }
1985
1986 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1987 fe->dai_link->name, params_rate(params),
1988 params_channels(params), params_format(params));
1989
1990 /* call hw_params on the frontend */
1991 ret = soc_pcm_hw_params(substream, params);
1992 if (ret < 0) {
1993 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1994 dpcm_be_dai_hw_free(fe, stream);
1995 } else
1996 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1997
1998 out:
1999 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2000 mutex_unlock(&fe->card->mutex);
2001 return ret;
2002 }
2003
2004 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2005 struct snd_pcm_substream *substream, int cmd)
2006 {
2007 int ret;
2008
2009 dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2010 dpcm->be->dai_link->name, cmd);
2011
2012 ret = soc_pcm_trigger(substream, cmd);
2013 if (ret < 0)
2014 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2015
2016 return ret;
2017 }
2018
2019 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2020 int cmd)
2021 {
2022 struct snd_soc_dpcm *dpcm;
2023 int ret = 0;
2024
2025 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2026
2027 struct snd_soc_pcm_runtime *be = dpcm->be;
2028 struct snd_pcm_substream *be_substream =
2029 snd_soc_dpcm_get_substream(be, stream);
2030
2031 /* is this op for this BE ? */
2032 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2033 continue;
2034
2035 switch (cmd) {
2036 case SNDRV_PCM_TRIGGER_START:
2037 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2038 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2039 continue;
2040
2041 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2042 if (ret)
2043 return ret;
2044
2045 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2046 break;
2047 case SNDRV_PCM_TRIGGER_RESUME:
2048 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2049 continue;
2050
2051 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2052 if (ret)
2053 return ret;
2054
2055 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2056 break;
2057 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2058 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2059 continue;
2060
2061 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2062 if (ret)
2063 return ret;
2064
2065 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2066 break;
2067 case SNDRV_PCM_TRIGGER_STOP:
2068 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2069 continue;
2070
2071 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2072 continue;
2073
2074 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2075 if (ret)
2076 return ret;
2077
2078 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2079 break;
2080 case SNDRV_PCM_TRIGGER_SUSPEND:
2081 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2082 continue;
2083
2084 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2085 continue;
2086
2087 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2088 if (ret)
2089 return ret;
2090
2091 be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2092 break;
2093 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2094 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2095 continue;
2096
2097 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2098 continue;
2099
2100 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2101 if (ret)
2102 return ret;
2103
2104 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2105 break;
2106 }
2107 }
2108
2109 return ret;
2110 }
2111 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2112
2113 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2114 {
2115 struct snd_soc_pcm_runtime *fe = substream->private_data;
2116 int stream = substream->stream, ret;
2117 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2118
2119 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2120
2121 switch (trigger) {
2122 case SND_SOC_DPCM_TRIGGER_PRE:
2123 /* call trigger on the frontend before the backend. */
2124
2125 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2126 fe->dai_link->name, cmd);
2127
2128 ret = soc_pcm_trigger(substream, cmd);
2129 if (ret < 0) {
2130 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2131 goto out;
2132 }
2133
2134 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2135 break;
2136 case SND_SOC_DPCM_TRIGGER_POST:
2137 /* call trigger on the frontend after the backend. */
2138
2139 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2140 if (ret < 0) {
2141 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2142 goto out;
2143 }
2144
2145 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2146 fe->dai_link->name, cmd);
2147
2148 ret = soc_pcm_trigger(substream, cmd);
2149 break;
2150 case SND_SOC_DPCM_TRIGGER_BESPOKE:
2151 /* bespoke trigger() - handles both FE and BEs */
2152
2153 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2154 fe->dai_link->name, cmd);
2155
2156 ret = soc_pcm_bespoke_trigger(substream, cmd);
2157 if (ret < 0) {
2158 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2159 goto out;
2160 }
2161 break;
2162 default:
2163 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2164 fe->dai_link->name);
2165 ret = -EINVAL;
2166 goto out;
2167 }
2168
2169 switch (cmd) {
2170 case SNDRV_PCM_TRIGGER_START:
2171 case SNDRV_PCM_TRIGGER_RESUME:
2172 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2173 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2174 break;
2175 case SNDRV_PCM_TRIGGER_STOP:
2176 case SNDRV_PCM_TRIGGER_SUSPEND:
2177 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2178 break;
2179 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2180 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2181 break;
2182 }
2183
2184 out:
2185 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2186 return ret;
2187 }
2188
2189 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2190 {
2191 struct snd_soc_pcm_runtime *fe = substream->private_data;
2192 int stream = substream->stream;
2193
2194 /* if FE's runtime_update is already set, we're in race;
2195 * process this trigger later at exit
2196 */
2197 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2198 fe->dpcm[stream].trigger_pending = cmd + 1;
2199 return 0; /* delayed, assuming it's successful */
2200 }
2201
2202 /* we're alone, let's trigger */
2203 return dpcm_fe_dai_do_trigger(substream, cmd);
2204 }
2205
2206 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2207 {
2208 struct snd_soc_dpcm *dpcm;
2209 int ret = 0;
2210
2211 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2212
2213 struct snd_soc_pcm_runtime *be = dpcm->be;
2214 struct snd_pcm_substream *be_substream =
2215 snd_soc_dpcm_get_substream(be, stream);
2216
2217 /* is this op for this BE ? */
2218 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2219 continue;
2220
2221 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2222 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2223 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2224 continue;
2225
2226 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2227 be->dai_link->name);
2228
2229 ret = soc_pcm_prepare(be_substream);
2230 if (ret < 0) {
2231 dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2232 ret);
2233 break;
2234 }
2235
2236 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2237 }
2238 return ret;
2239 }
2240
2241 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2242 {
2243 struct snd_soc_pcm_runtime *fe = substream->private_data;
2244 int stream = substream->stream, ret = 0;
2245
2246 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2247
2248 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2249
2250 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2251
2252 /* there is no point preparing this FE if there are no BEs */
2253 if (list_empty(&fe->dpcm[stream].be_clients)) {
2254 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2255 fe->dai_link->name);
2256 ret = -EINVAL;
2257 goto out;
2258 }
2259
2260 ret = dpcm_be_dai_prepare(fe, substream->stream);
2261 if (ret < 0)
2262 goto out;
2263
2264 /* call prepare on the frontend */
2265 ret = soc_pcm_prepare(substream);
2266 if (ret < 0) {
2267 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2268 fe->dai_link->name);
2269 goto out;
2270 }
2271
2272 /* run the stream event for each BE */
2273 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2274 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2275
2276 out:
2277 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2278 mutex_unlock(&fe->card->mutex);
2279
2280 return ret;
2281 }
2282
2283 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2284 unsigned int cmd, void *arg)
2285 {
2286 struct snd_soc_pcm_runtime *rtd = substream->private_data;
2287 struct snd_soc_platform *platform = rtd->platform;
2288
2289 if (platform->driver->ops && platform->driver->ops->ioctl)
2290 return platform->driver->ops->ioctl(substream, cmd, arg);
2291 return snd_pcm_lib_ioctl(substream, cmd, arg);
2292 }
2293
2294 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2295 {
2296 struct snd_pcm_substream *substream =
2297 snd_soc_dpcm_get_substream(fe, stream);
2298 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2299 int err;
2300
2301 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2302 stream ? "capture" : "playback", fe->dai_link->name);
2303
2304 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2305 /* call bespoke trigger - FE takes care of all BE triggers */
2306 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2307 fe->dai_link->name);
2308
2309 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2310 if (err < 0)
2311 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2312 } else {
2313 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2314 fe->dai_link->name);
2315
2316 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2317 if (err < 0)
2318 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2319 }
2320
2321 err = dpcm_be_dai_hw_free(fe, stream);
2322 if (err < 0)
2323 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2324
2325 err = dpcm_be_dai_shutdown(fe, stream);
2326 if (err < 0)
2327 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2328
2329 /* run the stream event for each BE */
2330 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2331
2332 return 0;
2333 }
2334
2335 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2336 {
2337 struct snd_pcm_substream *substream =
2338 snd_soc_dpcm_get_substream(fe, stream);
2339 struct snd_soc_dpcm *dpcm;
2340 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2341 int ret;
2342
2343 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2344 stream ? "capture" : "playback", fe->dai_link->name);
2345
2346 /* Only start the BE if the FE is ready */
2347 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2348 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2349 return -EINVAL;
2350
2351 /* startup must always be called for new BEs */
2352 ret = dpcm_be_dai_startup(fe, stream);
2353 if (ret < 0)
2354 goto disconnect;
2355
2356 /* keep going if FE state is > open */
2357 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2358 return 0;
2359
2360 ret = dpcm_be_dai_hw_params(fe, stream);
2361 if (ret < 0)
2362 goto close;
2363
2364 /* keep going if FE state is > hw_params */
2365 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2366 return 0;
2367
2368
2369 ret = dpcm_be_dai_prepare(fe, stream);
2370 if (ret < 0)
2371 goto hw_free;
2372
2373 /* run the stream event for each BE */
2374 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2375
2376 /* keep going if FE state is > prepare */
2377 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2378 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2379 return 0;
2380
2381 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2382 /* call trigger on the frontend - FE takes care of all BE triggers */
2383 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2384 fe->dai_link->name);
2385
2386 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2387 if (ret < 0) {
2388 dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2389 goto hw_free;
2390 }
2391 } else {
2392 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2393 fe->dai_link->name);
2394
2395 ret = dpcm_be_dai_trigger(fe, stream,
2396 SNDRV_PCM_TRIGGER_START);
2397 if (ret < 0) {
2398 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2399 goto hw_free;
2400 }
2401 }
2402
2403 return 0;
2404
2405 hw_free:
2406 dpcm_be_dai_hw_free(fe, stream);
2407 close:
2408 dpcm_be_dai_shutdown(fe, stream);
2409 disconnect:
2410 /* disconnect any non started BEs */
2411 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2412 struct snd_soc_pcm_runtime *be = dpcm->be;
2413 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2414 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2415 }
2416
2417 return ret;
2418 }
2419
2420 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2421 {
2422 int ret;
2423
2424 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2425 ret = dpcm_run_update_startup(fe, stream);
2426 if (ret < 0)
2427 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2428 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2429
2430 return ret;
2431 }
2432
2433 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2434 {
2435 int ret;
2436
2437 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2438 ret = dpcm_run_update_shutdown(fe, stream);
2439 if (ret < 0)
2440 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2441 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2442
2443 return ret;
2444 }
2445
2446 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2447 * any DAI links.
2448 */
2449 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2450 {
2451 struct snd_soc_pcm_runtime *fe;
2452 int old, new, paths;
2453
2454 mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2455 list_for_each_entry(fe, &card->rtd_list, list) {
2456 struct snd_soc_dapm_widget_list *list;
2457
2458 /* make sure link is FE */
2459 if (!fe->dai_link->dynamic)
2460 continue;
2461
2462 /* only check active links */
2463 if (!fe->cpu_dai->active)
2464 continue;
2465
2466 /* DAPM sync will call this to update DSP paths */
2467 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2468 fe->dai_link->name);
2469
2470 /* skip if FE doesn't have playback capability */
2471 if (!fe->cpu_dai->driver->playback.channels_min
2472 || !fe->codec_dai->driver->playback.channels_min)
2473 goto capture;
2474
2475 /* skip if FE isn't currently playing */
2476 if (!fe->cpu_dai->playback_active
2477 || !fe->codec_dai->playback_active)
2478 goto capture;
2479
2480 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2481 if (paths < 0) {
2482 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2483 fe->dai_link->name, "playback");
2484 mutex_unlock(&card->mutex);
2485 return paths;
2486 }
2487
2488 /* update any new playback paths */
2489 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2490 if (new) {
2491 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2492 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2493 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2494 }
2495
2496 /* update any old playback paths */
2497 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2498 if (old) {
2499 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2500 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2501 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2502 }
2503
2504 dpcm_path_put(&list);
2505 capture:
2506 /* skip if FE doesn't have capture capability */
2507 if (!fe->cpu_dai->driver->capture.channels_min
2508 || !fe->codec_dai->driver->capture.channels_min)
2509 continue;
2510
2511 /* skip if FE isn't currently capturing */
2512 if (!fe->cpu_dai->capture_active
2513 || !fe->codec_dai->capture_active)
2514 continue;
2515
2516 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2517 if (paths < 0) {
2518 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2519 fe->dai_link->name, "capture");
2520 mutex_unlock(&card->mutex);
2521 return paths;
2522 }
2523
2524 /* update any new capture paths */
2525 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2526 if (new) {
2527 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2528 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2529 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2530 }
2531
2532 /* update any old capture paths */
2533 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2534 if (old) {
2535 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2536 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2537 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2538 }
2539
2540 dpcm_path_put(&list);
2541 }
2542
2543 mutex_unlock(&card->mutex);
2544 return 0;
2545 }
2546 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2547 {
2548 struct snd_soc_dpcm *dpcm;
2549 struct list_head *clients =
2550 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2551
2552 list_for_each_entry(dpcm, clients, list_be) {
2553
2554 struct snd_soc_pcm_runtime *be = dpcm->be;
2555 int i;
2556
2557 if (be->dai_link->ignore_suspend)
2558 continue;
2559
2560 for (i = 0; i < be->num_codecs; i++) {
2561 struct snd_soc_dai *dai = be->codec_dais[i];
2562 struct snd_soc_dai_driver *drv = dai->driver;
2563
2564 dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2565 be->dai_link->name);
2566
2567 if (drv->ops && drv->ops->digital_mute &&
2568 dai->playback_active)
2569 drv->ops->digital_mute(dai, mute);
2570 }
2571 }
2572
2573 return 0;
2574 }
2575
2576 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2577 {
2578 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2579 struct snd_soc_dpcm *dpcm;
2580 struct snd_soc_dapm_widget_list *list;
2581 int ret;
2582 int stream = fe_substream->stream;
2583
2584 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2585 fe->dpcm[stream].runtime = fe_substream->runtime;
2586
2587 ret = dpcm_path_get(fe, stream, &list);
2588 if (ret < 0) {
2589 mutex_unlock(&fe->card->mutex);
2590 return ret;
2591 } else if (ret == 0) {
2592 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2593 fe->dai_link->name, stream ? "capture" : "playback");
2594 }
2595
2596 /* calculate valid and active FE <-> BE dpcms */
2597 dpcm_process_paths(fe, stream, &list, 1);
2598
2599 ret = dpcm_fe_dai_startup(fe_substream);
2600 if (ret < 0) {
2601 /* clean up all links */
2602 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2603 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2604
2605 dpcm_be_disconnect(fe, stream);
2606 fe->dpcm[stream].runtime = NULL;
2607 }
2608
2609 dpcm_clear_pending_state(fe, stream);
2610 dpcm_path_put(&list);
2611 mutex_unlock(&fe->card->mutex);
2612 return ret;
2613 }
2614
2615 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2616 {
2617 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2618 struct snd_soc_dpcm *dpcm;
2619 int stream = fe_substream->stream, ret;
2620
2621 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2622 ret = dpcm_fe_dai_shutdown(fe_substream);
2623
2624 /* mark FE's links ready to prune */
2625 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2626 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2627
2628 dpcm_be_disconnect(fe, stream);
2629
2630 fe->dpcm[stream].runtime = NULL;
2631 mutex_unlock(&fe->card->mutex);
2632 return ret;
2633 }
2634
2635 /* create a new pcm */
2636 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2637 {
2638 struct snd_soc_platform *platform = rtd->platform;
2639 struct snd_soc_dai *codec_dai;
2640 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2641 struct snd_pcm *pcm;
2642 char new_name[64];
2643 int ret = 0, playback = 0, capture = 0;
2644 int i;
2645
2646 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2647 playback = rtd->dai_link->dpcm_playback;
2648 capture = rtd->dai_link->dpcm_capture;
2649 } else {
2650 for (i = 0; i < rtd->num_codecs; i++) {
2651 codec_dai = rtd->codec_dais[i];
2652 if (codec_dai->driver->playback.channels_min)
2653 playback = 1;
2654 if (codec_dai->driver->capture.channels_min)
2655 capture = 1;
2656 }
2657
2658 capture = capture && cpu_dai->driver->capture.channels_min;
2659 playback = playback && cpu_dai->driver->playback.channels_min;
2660 }
2661
2662 if (rtd->dai_link->playback_only) {
2663 playback = 1;
2664 capture = 0;
2665 }
2666
2667 if (rtd->dai_link->capture_only) {
2668 playback = 0;
2669 capture = 1;
2670 }
2671
2672 /* create the PCM */
2673 if (rtd->dai_link->no_pcm) {
2674 snprintf(new_name, sizeof(new_name), "(%s)",
2675 rtd->dai_link->stream_name);
2676
2677 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2678 playback, capture, &pcm);
2679 } else {
2680 if (rtd->dai_link->dynamic)
2681 snprintf(new_name, sizeof(new_name), "%s (*)",
2682 rtd->dai_link->stream_name);
2683 else
2684 snprintf(new_name, sizeof(new_name), "%s %s-%d",
2685 rtd->dai_link->stream_name,
2686 (rtd->num_codecs > 1) ?
2687 "multicodec" : rtd->codec_dai->name, num);
2688
2689 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2690 capture, &pcm);
2691 }
2692 if (ret < 0) {
2693 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2694 rtd->dai_link->name);
2695 return ret;
2696 }
2697 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2698
2699 /* DAPM dai link stream work */
2700 INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2701
2702 pcm->nonatomic = rtd->dai_link->nonatomic;
2703 rtd->pcm = pcm;
2704 pcm->private_data = rtd;
2705
2706 if (rtd->dai_link->no_pcm) {
2707 if (playback)
2708 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2709 if (capture)
2710 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2711 goto out;
2712 }
2713
2714 /* ASoC PCM operations */
2715 if (rtd->dai_link->dynamic) {
2716 rtd->ops.open = dpcm_fe_dai_open;
2717 rtd->ops.hw_params = dpcm_fe_dai_hw_params;
2718 rtd->ops.prepare = dpcm_fe_dai_prepare;
2719 rtd->ops.trigger = dpcm_fe_dai_trigger;
2720 rtd->ops.hw_free = dpcm_fe_dai_hw_free;
2721 rtd->ops.close = dpcm_fe_dai_close;
2722 rtd->ops.pointer = soc_pcm_pointer;
2723 rtd->ops.ioctl = soc_pcm_ioctl;
2724 } else {
2725 rtd->ops.open = soc_pcm_open;
2726 rtd->ops.hw_params = soc_pcm_hw_params;
2727 rtd->ops.prepare = soc_pcm_prepare;
2728 rtd->ops.trigger = soc_pcm_trigger;
2729 rtd->ops.hw_free = soc_pcm_hw_free;
2730 rtd->ops.close = soc_pcm_close;
2731 rtd->ops.pointer = soc_pcm_pointer;
2732 rtd->ops.ioctl = soc_pcm_ioctl;
2733 }
2734
2735 if (platform->driver->ops) {
2736 rtd->ops.ack = platform->driver->ops->ack;
2737 rtd->ops.copy_user = platform->driver->ops->copy_user;
2738 rtd->ops.copy_kernel = platform->driver->ops->copy_kernel;
2739 rtd->ops.fill_silence = platform->driver->ops->fill_silence;
2740 rtd->ops.page = platform->driver->ops->page;
2741 rtd->ops.mmap = platform->driver->ops->mmap;
2742 }
2743
2744 if (playback)
2745 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2746
2747 if (capture)
2748 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2749
2750 if (platform->driver->pcm_new) {
2751 ret = platform->driver->pcm_new(rtd);
2752 if (ret < 0) {
2753 dev_err(platform->dev,
2754 "ASoC: pcm constructor failed: %d\n",
2755 ret);
2756 return ret;
2757 }
2758 }
2759
2760 pcm->private_free = platform->driver->pcm_free;
2761 out:
2762 dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2763 (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2764 cpu_dai->name);
2765 return ret;
2766 }
2767
2768 /* is the current PCM operation for this FE ? */
2769 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2770 {
2771 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2772 return 1;
2773 return 0;
2774 }
2775 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2776
2777 /* is the current PCM operation for this BE ? */
2778 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2779 struct snd_soc_pcm_runtime *be, int stream)
2780 {
2781 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2782 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2783 be->dpcm[stream].runtime_update))
2784 return 1;
2785 return 0;
2786 }
2787 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2788
2789 /* get the substream for this BE */
2790 struct snd_pcm_substream *
2791 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2792 {
2793 return be->pcm->streams[stream].substream;
2794 }
2795 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2796
2797 /* get the BE runtime state */
2798 enum snd_soc_dpcm_state
2799 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2800 {
2801 return be->dpcm[stream].state;
2802 }
2803 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2804
2805 /* set the BE runtime state */
2806 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2807 int stream, enum snd_soc_dpcm_state state)
2808 {
2809 be->dpcm[stream].state = state;
2810 }
2811 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2812
2813 /*
2814 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2815 * are not running, paused or suspended for the specified stream direction.
2816 */
2817 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2818 struct snd_soc_pcm_runtime *be, int stream)
2819 {
2820 struct snd_soc_dpcm *dpcm;
2821 int state;
2822
2823 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2824
2825 if (dpcm->fe == fe)
2826 continue;
2827
2828 state = dpcm->fe->dpcm[stream].state;
2829 if (state == SND_SOC_DPCM_STATE_START ||
2830 state == SND_SOC_DPCM_STATE_PAUSED ||
2831 state == SND_SOC_DPCM_STATE_SUSPEND)
2832 return 0;
2833 }
2834
2835 /* it's safe to free/stop this BE DAI */
2836 return 1;
2837 }
2838 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2839
2840 /*
2841 * We can only change hw params a BE DAI if any of it's FE are not prepared,
2842 * running, paused or suspended for the specified stream direction.
2843 */
2844 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2845 struct snd_soc_pcm_runtime *be, int stream)
2846 {
2847 struct snd_soc_dpcm *dpcm;
2848 int state;
2849
2850 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2851
2852 if (dpcm->fe == fe)
2853 continue;
2854
2855 state = dpcm->fe->dpcm[stream].state;
2856 if (state == SND_SOC_DPCM_STATE_START ||
2857 state == SND_SOC_DPCM_STATE_PAUSED ||
2858 state == SND_SOC_DPCM_STATE_SUSPEND ||
2859 state == SND_SOC_DPCM_STATE_PREPARE)
2860 return 0;
2861 }
2862
2863 /* it's safe to change hw_params */
2864 return 1;
2865 }
2866 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2867
2868 #ifdef CONFIG_DEBUG_FS
2869 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2870 {
2871 switch (state) {
2872 case SND_SOC_DPCM_STATE_NEW:
2873 return "new";
2874 case SND_SOC_DPCM_STATE_OPEN:
2875 return "open";
2876 case SND_SOC_DPCM_STATE_HW_PARAMS:
2877 return "hw_params";
2878 case SND_SOC_DPCM_STATE_PREPARE:
2879 return "prepare";
2880 case SND_SOC_DPCM_STATE_START:
2881 return "start";
2882 case SND_SOC_DPCM_STATE_STOP:
2883 return "stop";
2884 case SND_SOC_DPCM_STATE_SUSPEND:
2885 return "suspend";
2886 case SND_SOC_DPCM_STATE_PAUSED:
2887 return "paused";
2888 case SND_SOC_DPCM_STATE_HW_FREE:
2889 return "hw_free";
2890 case SND_SOC_DPCM_STATE_CLOSE:
2891 return "close";
2892 }
2893
2894 return "unknown";
2895 }
2896
2897 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2898 int stream, char *buf, size_t size)
2899 {
2900 struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2901 struct snd_soc_dpcm *dpcm;
2902 ssize_t offset = 0;
2903
2904 /* FE state */
2905 offset += snprintf(buf + offset, size - offset,
2906 "[%s - %s]\n", fe->dai_link->name,
2907 stream ? "Capture" : "Playback");
2908
2909 offset += snprintf(buf + offset, size - offset, "State: %s\n",
2910 dpcm_state_string(fe->dpcm[stream].state));
2911
2912 if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2913 (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2914 offset += snprintf(buf + offset, size - offset,
2915 "Hardware Params: "
2916 "Format = %s, Channels = %d, Rate = %d\n",
2917 snd_pcm_format_name(params_format(params)),
2918 params_channels(params),
2919 params_rate(params));
2920
2921 /* BEs state */
2922 offset += snprintf(buf + offset, size - offset, "Backends:\n");
2923
2924 if (list_empty(&fe->dpcm[stream].be_clients)) {
2925 offset += snprintf(buf + offset, size - offset,
2926 " No active DSP links\n");
2927 goto out;
2928 }
2929
2930 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2931 struct snd_soc_pcm_runtime *be = dpcm->be;
2932 params = &dpcm->hw_params;
2933
2934 offset += snprintf(buf + offset, size - offset,
2935 "- %s\n", be->dai_link->name);
2936
2937 offset += snprintf(buf + offset, size - offset,
2938 " State: %s\n",
2939 dpcm_state_string(be->dpcm[stream].state));
2940
2941 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2942 (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2943 offset += snprintf(buf + offset, size - offset,
2944 " Hardware Params: "
2945 "Format = %s, Channels = %d, Rate = %d\n",
2946 snd_pcm_format_name(params_format(params)),
2947 params_channels(params),
2948 params_rate(params));
2949 }
2950
2951 out:
2952 return offset;
2953 }
2954
2955 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2956 size_t count, loff_t *ppos)
2957 {
2958 struct snd_soc_pcm_runtime *fe = file->private_data;
2959 ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2960 char *buf;
2961
2962 buf = kmalloc(out_count, GFP_KERNEL);
2963 if (!buf)
2964 return -ENOMEM;
2965
2966 if (fe->cpu_dai->driver->playback.channels_min)
2967 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2968 buf + offset, out_count - offset);
2969
2970 if (fe->cpu_dai->driver->capture.channels_min)
2971 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2972 buf + offset, out_count - offset);
2973
2974 ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2975
2976 kfree(buf);
2977 return ret;
2978 }
2979
2980 static const struct file_operations dpcm_state_fops = {
2981 .open = simple_open,
2982 .read = dpcm_state_read_file,
2983 .llseek = default_llseek,
2984 };
2985
2986 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2987 {
2988 if (!rtd->dai_link)
2989 return;
2990
2991 if (!rtd->card->debugfs_card_root)
2992 return;
2993
2994 rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2995 rtd->card->debugfs_card_root);
2996 if (!rtd->debugfs_dpcm_root) {
2997 dev_dbg(rtd->dev,
2998 "ASoC: Failed to create dpcm debugfs directory %s\n",
2999 rtd->dai_link->name);
3000 return;
3001 }
3002
3003 rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3004 rtd->debugfs_dpcm_root,
3005 rtd, &dpcm_state_fops);
3006 }
3007 #endif
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