2 * soc-pcm.c -- ALSA SoC PCM
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Copyright 2005 Openedhand Ltd.
6 * Copyright (C) 2010 Slimlogic Ltd.
7 * Copyright (C) 2010 Texas Instruments Inc.
9 * Authors: Liam Girdwood <lrg@ti.com>
10 * Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
35 #define DPCM_MAX_BE_USERS 8
38 * snd_soc_runtime_activate() - Increment active count for PCM runtime components
39 * @rtd: ASoC PCM runtime that is activated
40 * @stream: Direction of the PCM stream
42 * Increments the active count for all the DAIs and components attached to a PCM
43 * runtime. Should typically be called when a stream is opened.
45 * Must be called with the rtd->pcm_mutex being held
47 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
49 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
52 lockdep_assert_held(&rtd->pcm_mutex);
54 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
55 cpu_dai->playback_active++;
56 for (i = 0; i < rtd->num_codecs; i++)
57 rtd->codec_dais[i]->playback_active++;
59 cpu_dai->capture_active++;
60 for (i = 0; i < rtd->num_codecs; i++)
61 rtd->codec_dais[i]->capture_active++;
65 cpu_dai->component->active++;
66 for (i = 0; i < rtd->num_codecs; i++) {
67 rtd->codec_dais[i]->active++;
68 rtd->codec_dais[i]->component->active++;
73 * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
74 * @rtd: ASoC PCM runtime that is deactivated
75 * @stream: Direction of the PCM stream
77 * Decrements the active count for all the DAIs and components attached to a PCM
78 * runtime. Should typically be called when a stream is closed.
80 * Must be called with the rtd->pcm_mutex being held
82 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
84 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
87 lockdep_assert_held(&rtd->pcm_mutex);
89 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
90 cpu_dai->playback_active--;
91 for (i = 0; i < rtd->num_codecs; i++)
92 rtd->codec_dais[i]->playback_active--;
94 cpu_dai->capture_active--;
95 for (i = 0; i < rtd->num_codecs; i++)
96 rtd->codec_dais[i]->capture_active--;
100 cpu_dai->component->active--;
101 for (i = 0; i < rtd->num_codecs; i++) {
102 rtd->codec_dais[i]->component->active--;
103 rtd->codec_dais[i]->active--;
108 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
109 * @rtd: The ASoC PCM runtime that should be checked.
111 * This function checks whether the power down delay should be ignored for a
112 * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
113 * been configured to ignore the delay, or if none of the components benefits
114 * from having the delay.
116 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
121 if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
124 for (i = 0; i < rtd->num_codecs; i++)
125 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
127 return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
131 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
132 * @substream: the pcm substream
133 * @hw: the hardware parameters
135 * Sets the substream runtime hardware parameters.
137 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
138 const struct snd_pcm_hardware *hw)
140 struct snd_pcm_runtime *runtime = substream->runtime;
141 runtime->hw.info = hw->info;
142 runtime->hw.formats = hw->formats;
143 runtime->hw.period_bytes_min = hw->period_bytes_min;
144 runtime->hw.period_bytes_max = hw->period_bytes_max;
145 runtime->hw.periods_min = hw->periods_min;
146 runtime->hw.periods_max = hw->periods_max;
147 runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
148 runtime->hw.fifo_size = hw->fifo_size;
151 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
153 /* DPCM stream event, send event to FE and all active BEs. */
154 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
157 struct snd_soc_dpcm *dpcm;
159 list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
161 struct snd_soc_pcm_runtime *be = dpcm->be;
163 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
164 be->dai_link->name, event, dir);
166 snd_soc_dapm_stream_event(be, dir, event);
169 snd_soc_dapm_stream_event(fe, dir, event);
174 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
175 struct snd_soc_dai *soc_dai)
177 struct snd_soc_pcm_runtime *rtd = substream->private_data;
180 if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
181 rtd->dai_link->symmetric_rates)) {
182 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
185 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
186 SNDRV_PCM_HW_PARAM_RATE,
187 soc_dai->rate, soc_dai->rate);
189 dev_err(soc_dai->dev,
190 "ASoC: Unable to apply rate constraint: %d\n",
196 if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
197 rtd->dai_link->symmetric_channels)) {
198 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
201 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
202 SNDRV_PCM_HW_PARAM_CHANNELS,
206 dev_err(soc_dai->dev,
207 "ASoC: Unable to apply channel symmetry constraint: %d\n",
213 if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
214 rtd->dai_link->symmetric_samplebits)) {
215 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
216 soc_dai->sample_bits);
218 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
219 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
220 soc_dai->sample_bits,
221 soc_dai->sample_bits);
223 dev_err(soc_dai->dev,
224 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
233 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
234 struct snd_pcm_hw_params *params)
236 struct snd_soc_pcm_runtime *rtd = substream->private_data;
237 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
238 unsigned int rate, channels, sample_bits, symmetry, i;
240 rate = params_rate(params);
241 channels = params_channels(params);
242 sample_bits = snd_pcm_format_physical_width(params_format(params));
244 /* reject unmatched parameters when applying symmetry */
245 symmetry = cpu_dai->driver->symmetric_rates ||
246 rtd->dai_link->symmetric_rates;
248 for (i = 0; i < rtd->num_codecs; i++)
249 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
251 if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
252 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
253 cpu_dai->rate, rate);
257 symmetry = cpu_dai->driver->symmetric_channels ||
258 rtd->dai_link->symmetric_channels;
260 for (i = 0; i < rtd->num_codecs; i++)
261 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
263 if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
264 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
265 cpu_dai->channels, channels);
269 symmetry = cpu_dai->driver->symmetric_samplebits ||
270 rtd->dai_link->symmetric_samplebits;
272 for (i = 0; i < rtd->num_codecs; i++)
273 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
275 if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
276 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
277 cpu_dai->sample_bits, sample_bits);
284 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
286 struct snd_soc_pcm_runtime *rtd = substream->private_data;
287 struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
288 struct snd_soc_dai_link *link = rtd->dai_link;
289 unsigned int symmetry, i;
291 symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
292 cpu_driver->symmetric_channels || link->symmetric_channels ||
293 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
295 for (i = 0; i < rtd->num_codecs; i++)
296 symmetry = symmetry ||
297 rtd->codec_dais[i]->driver->symmetric_rates ||
298 rtd->codec_dais[i]->driver->symmetric_channels ||
299 rtd->codec_dais[i]->driver->symmetric_samplebits;
304 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
306 struct snd_soc_pcm_runtime *rtd = substream->private_data;
312 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
314 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
318 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
320 struct snd_soc_pcm_runtime *rtd = substream->private_data;
321 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
322 struct snd_soc_dai *codec_dai;
324 unsigned int bits = 0, cpu_bits;
326 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
327 for (i = 0; i < rtd->num_codecs; i++) {
328 codec_dai = rtd->codec_dais[i];
329 if (codec_dai->driver->playback.sig_bits == 0) {
333 bits = max(codec_dai->driver->playback.sig_bits, bits);
335 cpu_bits = cpu_dai->driver->playback.sig_bits;
337 for (i = 0; i < rtd->num_codecs; i++) {
338 codec_dai = rtd->codec_dais[i];
339 if (codec_dai->driver->capture.sig_bits == 0) {
343 bits = max(codec_dai->driver->capture.sig_bits, bits);
345 cpu_bits = cpu_dai->driver->capture.sig_bits;
348 soc_pcm_set_msb(substream, bits);
349 soc_pcm_set_msb(substream, cpu_bits);
352 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
354 struct snd_pcm_runtime *runtime = substream->runtime;
355 struct snd_pcm_hardware *hw = &runtime->hw;
356 struct snd_soc_pcm_runtime *rtd = substream->private_data;
357 struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
358 struct snd_soc_dai_driver *codec_dai_drv;
359 struct snd_soc_pcm_stream *codec_stream;
360 struct snd_soc_pcm_stream *cpu_stream;
361 unsigned int chan_min = 0, chan_max = UINT_MAX;
362 unsigned int rate_min = 0, rate_max = UINT_MAX;
363 unsigned int rates = UINT_MAX;
364 u64 formats = ULLONG_MAX;
367 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
368 cpu_stream = &cpu_dai_drv->playback;
370 cpu_stream = &cpu_dai_drv->capture;
372 /* first calculate min/max only for CODECs in the DAI link */
373 for (i = 0; i < rtd->num_codecs; i++) {
374 codec_dai_drv = rtd->codec_dais[i]->driver;
375 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
376 codec_stream = &codec_dai_drv->playback;
378 codec_stream = &codec_dai_drv->capture;
379 chan_min = max(chan_min, codec_stream->channels_min);
380 chan_max = min(chan_max, codec_stream->channels_max);
381 rate_min = max(rate_min, codec_stream->rate_min);
382 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
383 formats &= codec_stream->formats;
384 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
388 * chan min/max cannot be enforced if there are multiple CODEC DAIs
389 * connected to a single CPU DAI, use CPU DAI's directly and let
390 * channel allocation be fixed up later
392 if (rtd->num_codecs > 1) {
393 chan_min = cpu_stream->channels_min;
394 chan_max = cpu_stream->channels_max;
397 hw->channels_min = max(chan_min, cpu_stream->channels_min);
398 hw->channels_max = min(chan_max, cpu_stream->channels_max);
400 hw->formats &= formats & cpu_stream->formats;
402 hw->formats = formats & cpu_stream->formats;
403 hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
405 snd_pcm_limit_hw_rates(runtime);
407 hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
408 hw->rate_min = max(hw->rate_min, rate_min);
409 hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
410 hw->rate_max = min_not_zero(hw->rate_max, rate_max);
414 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
415 * then initialized and any private data can be allocated. This also calls
416 * startup for the cpu DAI, platform, machine and codec DAI.
418 static int soc_pcm_open(struct snd_pcm_substream *substream)
420 struct snd_soc_pcm_runtime *rtd = substream->private_data;
421 struct snd_pcm_runtime *runtime = substream->runtime;
422 struct snd_soc_platform *platform = rtd->platform;
423 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
424 struct snd_soc_dai *codec_dai;
425 const char *codec_dai_name = "multicodec";
428 pinctrl_pm_select_default_state(cpu_dai->dev);
429 for (i = 0; i < rtd->num_codecs; i++)
430 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
431 pm_runtime_get_sync(cpu_dai->dev);
432 for (i = 0; i < rtd->num_codecs; i++)
433 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
434 pm_runtime_get_sync(platform->dev);
436 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
438 /* startup the audio subsystem */
439 if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
440 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
442 dev_err(cpu_dai->dev, "ASoC: can't open interface"
443 " %s: %d\n", cpu_dai->name, ret);
448 if (platform->driver->ops && platform->driver->ops->open) {
449 ret = platform->driver->ops->open(substream);
451 dev_err(platform->dev, "ASoC: can't open platform"
452 " %s: %d\n", platform->component.name, ret);
457 for (i = 0; i < rtd->num_codecs; i++) {
458 codec_dai = rtd->codec_dais[i];
459 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
460 ret = codec_dai->driver->ops->startup(substream,
463 dev_err(codec_dai->dev,
464 "ASoC: can't open codec %s: %d\n",
465 codec_dai->name, ret);
470 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
471 codec_dai->tx_mask = 0;
473 codec_dai->rx_mask = 0;
476 if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
477 ret = rtd->dai_link->ops->startup(substream);
479 pr_err("ASoC: %s startup failed: %d\n",
480 rtd->dai_link->name, ret);
485 /* Dynamic PCM DAI links compat checks use dynamic capabilities */
486 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
489 /* Check that the codec and cpu DAIs are compatible */
490 soc_pcm_init_runtime_hw(substream);
492 if (rtd->num_codecs == 1)
493 codec_dai_name = rtd->codec_dai->name;
495 if (soc_pcm_has_symmetry(substream))
496 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
499 if (!runtime->hw.rates) {
500 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
501 codec_dai_name, cpu_dai->name);
504 if (!runtime->hw.formats) {
505 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
506 codec_dai_name, cpu_dai->name);
509 if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
510 runtime->hw.channels_min > runtime->hw.channels_max) {
511 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
512 codec_dai_name, cpu_dai->name);
516 soc_pcm_apply_msb(substream);
518 /* Symmetry only applies if we've already got an active stream. */
519 if (cpu_dai->active) {
520 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
525 for (i = 0; i < rtd->num_codecs; i++) {
526 if (rtd->codec_dais[i]->active) {
527 ret = soc_pcm_apply_symmetry(substream,
534 pr_debug("ASoC: %s <-> %s info:\n",
535 codec_dai_name, cpu_dai->name);
536 pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
537 pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
538 runtime->hw.channels_max);
539 pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
540 runtime->hw.rate_max);
544 snd_soc_runtime_activate(rtd, substream->stream);
546 mutex_unlock(&rtd->pcm_mutex);
550 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
551 rtd->dai_link->ops->shutdown(substream);
558 codec_dai = rtd->codec_dais[i];
559 if (codec_dai->driver->ops->shutdown)
560 codec_dai->driver->ops->shutdown(substream, codec_dai);
563 if (platform->driver->ops && platform->driver->ops->close)
564 platform->driver->ops->close(substream);
567 if (cpu_dai->driver->ops->shutdown)
568 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
570 mutex_unlock(&rtd->pcm_mutex);
572 pm_runtime_put(platform->dev);
573 for (i = 0; i < rtd->num_codecs; i++)
574 pm_runtime_put(rtd->codec_dais[i]->dev);
575 pm_runtime_put(cpu_dai->dev);
576 for (i = 0; i < rtd->num_codecs; i++) {
577 if (!rtd->codec_dais[i]->active)
578 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
580 if (!cpu_dai->active)
581 pinctrl_pm_select_sleep_state(cpu_dai->dev);
587 * Power down the audio subsystem pmdown_time msecs after close is called.
588 * This is to ensure there are no pops or clicks in between any music tracks
589 * due to DAPM power cycling.
591 static void close_delayed_work(struct work_struct *work)
593 struct snd_soc_pcm_runtime *rtd =
594 container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
595 struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
597 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
599 dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
600 codec_dai->driver->playback.stream_name,
601 codec_dai->playback_active ? "active" : "inactive",
602 rtd->pop_wait ? "yes" : "no");
604 /* are we waiting on this codec DAI stream */
605 if (rtd->pop_wait == 1) {
607 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
608 SND_SOC_DAPM_STREAM_STOP);
611 mutex_unlock(&rtd->pcm_mutex);
615 * Called by ALSA when a PCM substream is closed. Private data can be
616 * freed here. The cpu DAI, codec DAI, machine and platform are also
619 static int soc_pcm_close(struct snd_pcm_substream *substream)
621 struct snd_soc_pcm_runtime *rtd = substream->private_data;
622 struct snd_soc_platform *platform = rtd->platform;
623 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
624 struct snd_soc_dai *codec_dai;
627 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
629 snd_soc_runtime_deactivate(rtd, substream->stream);
631 /* clear the corresponding DAIs rate when inactive */
632 if (!cpu_dai->active)
635 for (i = 0; i < rtd->num_codecs; i++) {
636 codec_dai = rtd->codec_dais[i];
637 if (!codec_dai->active)
641 snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
643 if (cpu_dai->driver->ops->shutdown)
644 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
646 for (i = 0; i < rtd->num_codecs; i++) {
647 codec_dai = rtd->codec_dais[i];
648 if (codec_dai->driver->ops->shutdown)
649 codec_dai->driver->ops->shutdown(substream, codec_dai);
652 if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
653 rtd->dai_link->ops->shutdown(substream);
655 if (platform->driver->ops && platform->driver->ops->close)
656 platform->driver->ops->close(substream);
658 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
659 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
660 /* powered down playback stream now */
661 snd_soc_dapm_stream_event(rtd,
662 SNDRV_PCM_STREAM_PLAYBACK,
663 SND_SOC_DAPM_STREAM_STOP);
665 /* start delayed pop wq here for playback streams */
667 queue_delayed_work(system_power_efficient_wq,
669 msecs_to_jiffies(rtd->pmdown_time));
672 /* capture streams can be powered down now */
673 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
674 SND_SOC_DAPM_STREAM_STOP);
677 mutex_unlock(&rtd->pcm_mutex);
679 pm_runtime_put(platform->dev);
680 for (i = 0; i < rtd->num_codecs; i++)
681 pm_runtime_put(rtd->codec_dais[i]->dev);
682 pm_runtime_put(cpu_dai->dev);
683 for (i = 0; i < rtd->num_codecs; i++) {
684 if (!rtd->codec_dais[i]->active)
685 pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
687 if (!cpu_dai->active)
688 pinctrl_pm_select_sleep_state(cpu_dai->dev);
694 * Called by ALSA when the PCM substream is prepared, can set format, sample
695 * rate, etc. This function is non atomic and can be called multiple times,
696 * it can refer to the runtime info.
698 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
700 struct snd_soc_pcm_runtime *rtd = substream->private_data;
701 struct snd_soc_platform *platform = rtd->platform;
702 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
703 struct snd_soc_dai *codec_dai;
706 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
708 if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
709 ret = rtd->dai_link->ops->prepare(substream);
711 dev_err(rtd->card->dev, "ASoC: machine prepare error:"
717 if (platform->driver->ops && platform->driver->ops->prepare) {
718 ret = platform->driver->ops->prepare(substream);
720 dev_err(platform->dev, "ASoC: platform prepare error:"
726 for (i = 0; i < rtd->num_codecs; i++) {
727 codec_dai = rtd->codec_dais[i];
728 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
729 ret = codec_dai->driver->ops->prepare(substream,
732 dev_err(codec_dai->dev,
733 "ASoC: codec DAI prepare error: %d\n",
740 if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
741 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
743 dev_err(cpu_dai->dev,
744 "ASoC: cpu DAI prepare error: %d\n", ret);
749 /* cancel any delayed stream shutdown that is pending */
750 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
753 cancel_delayed_work(&rtd->delayed_work);
756 snd_soc_dapm_stream_event(rtd, substream->stream,
757 SND_SOC_DAPM_STREAM_START);
759 for (i = 0; i < rtd->num_codecs; i++)
760 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
762 snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
765 mutex_unlock(&rtd->pcm_mutex);
769 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
772 struct snd_interval *interval;
773 int channels = hweight_long(mask);
775 interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
776 interval->min = channels;
777 interval->max = channels;
780 int soc_dai_hw_params(struct snd_pcm_substream *substream,
781 struct snd_pcm_hw_params *params,
782 struct snd_soc_dai *dai)
786 if (dai->driver->ops && dai->driver->ops->hw_params) {
787 ret = dai->driver->ops->hw_params(substream, params, dai);
789 dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
799 * Called by ALSA when the hardware params are set by application. This
800 * function can also be called multiple times and can allocate buffers
801 * (using snd_pcm_lib_* ). It's non-atomic.
803 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
804 struct snd_pcm_hw_params *params)
806 struct snd_soc_pcm_runtime *rtd = substream->private_data;
807 struct snd_soc_platform *platform = rtd->platform;
808 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
811 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
813 ret = soc_pcm_params_symmetry(substream, params);
817 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
818 ret = rtd->dai_link->ops->hw_params(substream, params);
820 dev_err(rtd->card->dev, "ASoC: machine hw_params"
821 " failed: %d\n", ret);
826 for (i = 0; i < rtd->num_codecs; i++) {
827 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
828 struct snd_pcm_hw_params codec_params;
830 /* copy params for each codec */
831 codec_params = *params;
833 /* fixup params based on TDM slot masks */
834 if (codec_dai->tx_mask)
835 soc_pcm_codec_params_fixup(&codec_params,
837 if (codec_dai->rx_mask)
838 soc_pcm_codec_params_fixup(&codec_params,
841 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
845 codec_dai->rate = params_rate(&codec_params);
846 codec_dai->channels = params_channels(&codec_params);
847 codec_dai->sample_bits = snd_pcm_format_physical_width(
848 params_format(&codec_params));
851 ret = soc_dai_hw_params(substream, params, cpu_dai);
855 if (platform->driver->ops && platform->driver->ops->hw_params) {
856 ret = platform->driver->ops->hw_params(substream, params);
858 dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
859 platform->component.name, ret);
864 /* store the parameters for each DAIs */
865 cpu_dai->rate = params_rate(params);
866 cpu_dai->channels = params_channels(params);
867 cpu_dai->sample_bits =
868 snd_pcm_format_physical_width(params_format(params));
871 mutex_unlock(&rtd->pcm_mutex);
875 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
876 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
883 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
884 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
885 codec_dai->driver->ops->hw_free(substream, codec_dai);
889 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
890 rtd->dai_link->ops->hw_free(substream);
892 mutex_unlock(&rtd->pcm_mutex);
897 * Frees resources allocated by hw_params, can be called multiple times
899 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
901 struct snd_soc_pcm_runtime *rtd = substream->private_data;
902 struct snd_soc_platform *platform = rtd->platform;
903 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
904 struct snd_soc_dai *codec_dai;
905 bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
908 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
910 /* clear the corresponding DAIs parameters when going to be inactive */
911 if (cpu_dai->active == 1) {
913 cpu_dai->channels = 0;
914 cpu_dai->sample_bits = 0;
917 for (i = 0; i < rtd->num_codecs; i++) {
918 codec_dai = rtd->codec_dais[i];
919 if (codec_dai->active == 1) {
921 codec_dai->channels = 0;
922 codec_dai->sample_bits = 0;
926 /* apply codec digital mute */
927 for (i = 0; i < rtd->num_codecs; i++) {
928 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
929 (!playback && rtd->codec_dais[i]->capture_active == 1))
930 snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
934 /* free any machine hw params */
935 if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
936 rtd->dai_link->ops->hw_free(substream);
938 /* free any DMA resources */
939 if (platform->driver->ops && platform->driver->ops->hw_free)
940 platform->driver->ops->hw_free(substream);
942 /* now free hw params for the DAIs */
943 for (i = 0; i < rtd->num_codecs; i++) {
944 codec_dai = rtd->codec_dais[i];
945 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
946 codec_dai->driver->ops->hw_free(substream, codec_dai);
949 if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
950 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
952 mutex_unlock(&rtd->pcm_mutex);
956 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
958 struct snd_soc_pcm_runtime *rtd = substream->private_data;
959 struct snd_soc_platform *platform = rtd->platform;
960 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
961 struct snd_soc_dai *codec_dai;
964 for (i = 0; i < rtd->num_codecs; i++) {
965 codec_dai = rtd->codec_dais[i];
966 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
967 ret = codec_dai->driver->ops->trigger(substream,
974 if (platform->driver->ops && platform->driver->ops->trigger) {
975 ret = platform->driver->ops->trigger(substream, cmd);
980 if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
981 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
986 if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
987 ret = rtd->dai_link->ops->trigger(substream, cmd);
995 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
998 struct snd_soc_pcm_runtime *rtd = substream->private_data;
999 struct snd_soc_platform *platform = rtd->platform;
1000 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1001 struct snd_soc_dai *codec_dai;
1004 for (i = 0; i < rtd->num_codecs; i++) {
1005 codec_dai = rtd->codec_dais[i];
1006 if (codec_dai->driver->ops &&
1007 codec_dai->driver->ops->bespoke_trigger) {
1008 ret = codec_dai->driver->ops->bespoke_trigger(substream,
1015 if (platform->driver->bespoke_trigger) {
1016 ret = platform->driver->bespoke_trigger(substream, cmd);
1021 if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1022 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1029 * soc level wrapper for pointer callback
1030 * If cpu_dai, codec_dai, platform driver has the delay callback, than
1031 * the runtime->delay will be updated accordingly.
1033 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1035 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1036 struct snd_soc_platform *platform = rtd->platform;
1037 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1038 struct snd_soc_dai *codec_dai;
1039 struct snd_pcm_runtime *runtime = substream->runtime;
1040 snd_pcm_uframes_t offset = 0;
1041 snd_pcm_sframes_t delay = 0;
1042 snd_pcm_sframes_t codec_delay = 0;
1045 if (platform->driver->ops && platform->driver->ops->pointer)
1046 offset = platform->driver->ops->pointer(substream);
1048 if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1049 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1051 for (i = 0; i < rtd->num_codecs; i++) {
1052 codec_dai = rtd->codec_dais[i];
1053 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1054 codec_delay = max(codec_delay,
1055 codec_dai->driver->ops->delay(substream,
1058 delay += codec_delay;
1061 * None of the existing platform drivers implement delay(), so
1062 * for now the codec_dai of first multicodec entry is used
1064 if (platform->driver->delay)
1065 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1067 runtime->delay = delay;
1072 /* connect a FE and BE */
1073 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1074 struct snd_soc_pcm_runtime *be, int stream)
1076 struct snd_soc_dpcm *dpcm;
1078 /* only add new dpcms */
1079 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1080 if (dpcm->be == be && dpcm->fe == fe)
1084 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1090 be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1091 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1092 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1093 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1095 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1096 stream ? "capture" : "playback", fe->dai_link->name,
1097 stream ? "<-" : "->", be->dai_link->name);
1099 #ifdef CONFIG_DEBUG_FS
1100 if (fe->debugfs_dpcm_root)
1101 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1102 fe->debugfs_dpcm_root, &dpcm->state);
1107 /* reparent a BE onto another FE */
1108 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1109 struct snd_soc_pcm_runtime *be, int stream)
1111 struct snd_soc_dpcm *dpcm;
1112 struct snd_pcm_substream *fe_substream, *be_substream;
1114 /* reparent if BE is connected to other FEs */
1115 if (!be->dpcm[stream].users)
1118 be_substream = snd_soc_dpcm_get_substream(be, stream);
1120 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1124 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1125 stream ? "capture" : "playback",
1126 dpcm->fe->dai_link->name,
1127 stream ? "<-" : "->", dpcm->be->dai_link->name);
1129 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1130 be_substream->runtime = fe_substream->runtime;
1135 /* disconnect a BE and FE */
1136 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1138 struct snd_soc_dpcm *dpcm, *d;
1140 list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1141 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1142 stream ? "capture" : "playback",
1143 dpcm->be->dai_link->name);
1145 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1148 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1149 stream ? "capture" : "playback", fe->dai_link->name,
1150 stream ? "<-" : "->", dpcm->be->dai_link->name);
1152 /* BEs still alive need new FE */
1153 dpcm_be_reparent(fe, dpcm->be, stream);
1155 #ifdef CONFIG_DEBUG_FS
1156 debugfs_remove(dpcm->debugfs_state);
1158 list_del(&dpcm->list_be);
1159 list_del(&dpcm->list_fe);
1164 /* get BE for DAI widget and stream */
1165 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1166 struct snd_soc_dapm_widget *widget, int stream)
1168 struct snd_soc_pcm_runtime *be;
1171 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1172 for (i = 0; i < card->num_links; i++) {
1175 if (!be->dai_link->no_pcm)
1178 if (be->cpu_dai->playback_widget == widget)
1181 for (j = 0; j < be->num_codecs; j++) {
1182 struct snd_soc_dai *dai = be->codec_dais[j];
1183 if (dai->playback_widget == widget)
1189 for (i = 0; i < card->num_links; i++) {
1192 if (!be->dai_link->no_pcm)
1195 if (be->cpu_dai->capture_widget == widget)
1198 for (j = 0; j < be->num_codecs; j++) {
1199 struct snd_soc_dai *dai = be->codec_dais[j];
1200 if (dai->capture_widget == widget)
1206 dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1207 stream ? "capture" : "playback", widget->name);
1211 static inline struct snd_soc_dapm_widget *
1212 dai_get_widget(struct snd_soc_dai *dai, int stream)
1214 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1215 return dai->playback_widget;
1217 return dai->capture_widget;
1220 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1221 struct snd_soc_dapm_widget *widget)
1225 for (i = 0; i < list->num_widgets; i++) {
1226 if (widget == list->widgets[i])
1233 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1234 int stream, struct snd_soc_dapm_widget_list **list)
1236 struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1239 /* get number of valid DAI paths and their widgets */
1240 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list);
1242 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1243 stream ? "capture" : "playback");
1248 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1249 struct snd_soc_dapm_widget_list **list_)
1251 struct snd_soc_dpcm *dpcm;
1252 struct snd_soc_dapm_widget_list *list = *list_;
1253 struct snd_soc_dapm_widget *widget;
1256 /* Destroy any old FE <--> BE connections */
1257 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1260 /* is there a valid CPU DAI widget for this BE */
1261 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1263 /* prune the BE if it's no longer in our active list */
1264 if (widget && widget_in_list(list, widget))
1267 /* is there a valid CODEC DAI widget for this BE */
1268 for (i = 0; i < dpcm->be->num_codecs; i++) {
1269 struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1270 widget = dai_get_widget(dai, stream);
1272 /* prune the BE if it's no longer in our active list */
1273 if (widget && widget_in_list(list, widget))
1277 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1278 stream ? "capture" : "playback",
1279 dpcm->be->dai_link->name, fe->dai_link->name);
1280 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1281 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1285 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1289 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1290 struct snd_soc_dapm_widget_list **list_)
1292 struct snd_soc_card *card = fe->card;
1293 struct snd_soc_dapm_widget_list *list = *list_;
1294 struct snd_soc_pcm_runtime *be;
1295 int i, new = 0, err;
1297 /* Create any new FE <--> BE connections */
1298 for (i = 0; i < list->num_widgets; i++) {
1300 switch (list->widgets[i]->id) {
1301 case snd_soc_dapm_dai_in:
1302 case snd_soc_dapm_dai_out:
1308 /* is there a valid BE rtd for this widget */
1309 be = dpcm_get_be(card, list->widgets[i], stream);
1311 dev_err(fe->dev, "ASoC: no BE found for %s\n",
1312 list->widgets[i]->name);
1316 /* make sure BE is a real BE */
1317 if (!be->dai_link->no_pcm)
1320 /* don't connect if FE is not running */
1321 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1324 /* newly connected FE and BE */
1325 err = dpcm_be_connect(fe, be, stream);
1327 dev_err(fe->dev, "ASoC: can't connect %s\n",
1328 list->widgets[i]->name);
1330 } else if (err == 0) /* already connected */
1334 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1338 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1343 * Find the corresponding BE DAIs that source or sink audio to this
1346 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1347 int stream, struct snd_soc_dapm_widget_list **list, int new)
1350 return dpcm_add_paths(fe, stream, list);
1352 return dpcm_prune_paths(fe, stream, list);
1355 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1357 struct snd_soc_dpcm *dpcm;
1359 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1360 dpcm->be->dpcm[stream].runtime_update =
1361 SND_SOC_DPCM_UPDATE_NO;
1364 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1367 struct snd_soc_dpcm *dpcm;
1369 /* disable any enabled and non active backends */
1370 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1372 struct snd_soc_pcm_runtime *be = dpcm->be;
1373 struct snd_pcm_substream *be_substream =
1374 snd_soc_dpcm_get_substream(be, stream);
1376 if (be->dpcm[stream].users == 0)
1377 dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1378 stream ? "capture" : "playback",
1379 be->dpcm[stream].state);
1381 if (--be->dpcm[stream].users != 0)
1384 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1387 soc_pcm_close(be_substream);
1388 be_substream->runtime = NULL;
1389 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1393 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1395 struct snd_soc_dpcm *dpcm;
1398 /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1399 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1401 struct snd_soc_pcm_runtime *be = dpcm->be;
1402 struct snd_pcm_substream *be_substream =
1403 snd_soc_dpcm_get_substream(be, stream);
1405 if (!be_substream) {
1406 dev_err(be->dev, "ASoC: no backend %s stream\n",
1407 stream ? "capture" : "playback");
1411 /* is this op for this BE ? */
1412 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1415 /* first time the dpcm is open ? */
1416 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1417 dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1418 stream ? "capture" : "playback",
1419 be->dpcm[stream].state);
1421 if (be->dpcm[stream].users++ != 0)
1424 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1425 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1428 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1429 stream ? "capture" : "playback", be->dai_link->name);
1431 be_substream->runtime = be->dpcm[stream].runtime;
1432 err = soc_pcm_open(be_substream);
1434 dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1435 be->dpcm[stream].users--;
1436 if (be->dpcm[stream].users < 0)
1437 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1438 stream ? "capture" : "playback",
1439 be->dpcm[stream].state);
1441 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1445 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1452 /* disable any enabled and non active backends */
1453 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1454 struct snd_soc_pcm_runtime *be = dpcm->be;
1455 struct snd_pcm_substream *be_substream =
1456 snd_soc_dpcm_get_substream(be, stream);
1458 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1461 if (be->dpcm[stream].users == 0)
1462 dev_err(be->dev, "ASoC: no users %s at close %d\n",
1463 stream ? "capture" : "playback",
1464 be->dpcm[stream].state);
1466 if (--be->dpcm[stream].users != 0)
1469 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1472 soc_pcm_close(be_substream);
1473 be_substream->runtime = NULL;
1474 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1480 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1481 struct snd_soc_pcm_stream *stream,
1484 runtime->hw.rate_min = stream->rate_min;
1485 runtime->hw.rate_max = stream->rate_max;
1486 runtime->hw.channels_min = stream->channels_min;
1487 runtime->hw.channels_max = stream->channels_max;
1488 if (runtime->hw.formats)
1489 runtime->hw.formats &= formats & stream->formats;
1491 runtime->hw.formats = formats & stream->formats;
1492 runtime->hw.rates = stream->rates;
1495 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1497 struct snd_soc_pcm_runtime *fe = substream->private_data;
1498 struct snd_soc_dpcm *dpcm;
1499 u64 formats = ULLONG_MAX;
1500 int stream = substream->stream;
1502 if (!fe->dai_link->dpcm_merged_format)
1506 * It returns merged BE codec format
1507 * if FE want to use it (= dpcm_merged_format)
1510 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1511 struct snd_soc_pcm_runtime *be = dpcm->be;
1512 struct snd_soc_dai_driver *codec_dai_drv;
1513 struct snd_soc_pcm_stream *codec_stream;
1516 for (i = 0; i < be->num_codecs; i++) {
1517 codec_dai_drv = be->codec_dais[i]->driver;
1518 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1519 codec_stream = &codec_dai_drv->playback;
1521 codec_stream = &codec_dai_drv->capture;
1523 formats &= codec_stream->formats;
1530 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1532 struct snd_pcm_runtime *runtime = substream->runtime;
1533 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1534 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1535 struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1536 u64 format = dpcm_runtime_base_format(substream);
1538 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1539 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1541 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1544 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1546 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1547 * for avoiding the race with trigger callback.
1548 * If the state is unset and a trigger is pending while the previous operation,
1549 * process the pending trigger action here.
1551 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1552 int stream, enum snd_soc_dpcm_update state)
1554 struct snd_pcm_substream *substream =
1555 snd_soc_dpcm_get_substream(fe, stream);
1557 snd_pcm_stream_lock_irq(substream);
1558 if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1559 dpcm_fe_dai_do_trigger(substream,
1560 fe->dpcm[stream].trigger_pending - 1);
1561 fe->dpcm[stream].trigger_pending = 0;
1563 fe->dpcm[stream].runtime_update = state;
1564 snd_pcm_stream_unlock_irq(substream);
1567 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1569 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1570 struct snd_pcm_runtime *runtime = fe_substream->runtime;
1571 int stream = fe_substream->stream, ret = 0;
1573 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1575 ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1577 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1581 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1583 /* start the DAI frontend */
1584 ret = soc_pcm_open(fe_substream);
1586 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1590 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1592 dpcm_set_fe_runtime(fe_substream);
1593 snd_pcm_limit_hw_rates(runtime);
1595 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1599 dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1601 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1605 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1607 struct snd_soc_dpcm *dpcm;
1609 /* only shutdown BEs that are either sinks or sources to this FE DAI */
1610 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1612 struct snd_soc_pcm_runtime *be = dpcm->be;
1613 struct snd_pcm_substream *be_substream =
1614 snd_soc_dpcm_get_substream(be, stream);
1616 /* is this op for this BE ? */
1617 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1620 if (be->dpcm[stream].users == 0)
1621 dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1622 stream ? "capture" : "playback",
1623 be->dpcm[stream].state);
1625 if (--be->dpcm[stream].users != 0)
1628 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1629 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1632 dev_dbg(be->dev, "ASoC: close BE %s\n",
1633 dpcm->fe->dai_link->name);
1635 soc_pcm_close(be_substream);
1636 be_substream->runtime = NULL;
1638 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1643 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1645 struct snd_soc_pcm_runtime *fe = substream->private_data;
1646 int stream = substream->stream;
1648 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1650 /* shutdown the BEs */
1651 dpcm_be_dai_shutdown(fe, substream->stream);
1653 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1655 /* now shutdown the frontend */
1656 soc_pcm_close(substream);
1658 /* run the stream event for each BE */
1659 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1661 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1662 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1666 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1668 struct snd_soc_dpcm *dpcm;
1670 /* only hw_params backends that are either sinks or sources
1671 * to this frontend DAI */
1672 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1674 struct snd_soc_pcm_runtime *be = dpcm->be;
1675 struct snd_pcm_substream *be_substream =
1676 snd_soc_dpcm_get_substream(be, stream);
1678 /* is this op for this BE ? */
1679 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1682 /* only free hw when no longer used - check all FEs */
1683 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1686 /* do not free hw if this BE is used by other FE */
1687 if (be->dpcm[stream].users > 1)
1690 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1691 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1692 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1693 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1694 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1697 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1698 dpcm->fe->dai_link->name);
1700 soc_pcm_hw_free(be_substream);
1702 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1708 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1710 struct snd_soc_pcm_runtime *fe = substream->private_data;
1711 int err, stream = substream->stream;
1713 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1714 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1716 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1718 /* call hw_free on the frontend */
1719 err = soc_pcm_hw_free(substream);
1721 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1722 fe->dai_link->name);
1724 /* only hw_params backends that are either sinks or sources
1725 * to this frontend DAI */
1726 err = dpcm_be_dai_hw_free(fe, stream);
1728 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1729 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1731 mutex_unlock(&fe->card->mutex);
1735 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1737 struct snd_soc_dpcm *dpcm;
1740 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1742 struct snd_soc_pcm_runtime *be = dpcm->be;
1743 struct snd_pcm_substream *be_substream =
1744 snd_soc_dpcm_get_substream(be, stream);
1746 /* is this op for this BE ? */
1747 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1750 /* only allow hw_params() if no connected FEs are running */
1751 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1754 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1755 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1756 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1759 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1760 dpcm->fe->dai_link->name);
1762 /* copy params for each dpcm */
1763 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1764 sizeof(struct snd_pcm_hw_params));
1766 /* perform any hw_params fixups */
1767 if (be->dai_link->be_hw_params_fixup) {
1768 ret = be->dai_link->be_hw_params_fixup(be,
1772 "ASoC: hw_params BE fixup failed %d\n",
1778 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1780 dev_err(dpcm->be->dev,
1781 "ASoC: hw_params BE failed %d\n", ret);
1785 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1790 /* disable any enabled and non active backends */
1791 list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1792 struct snd_soc_pcm_runtime *be = dpcm->be;
1793 struct snd_pcm_substream *be_substream =
1794 snd_soc_dpcm_get_substream(be, stream);
1796 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1799 /* only allow hw_free() if no connected FEs are running */
1800 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1803 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1804 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1805 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1806 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1809 soc_pcm_hw_free(be_substream);
1815 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1816 struct snd_pcm_hw_params *params)
1818 struct snd_soc_pcm_runtime *fe = substream->private_data;
1819 int ret, stream = substream->stream;
1821 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1822 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1824 memcpy(&fe->dpcm[substream->stream].hw_params, params,
1825 sizeof(struct snd_pcm_hw_params));
1826 ret = dpcm_be_dai_hw_params(fe, substream->stream);
1828 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1832 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1833 fe->dai_link->name, params_rate(params),
1834 params_channels(params), params_format(params));
1836 /* call hw_params on the frontend */
1837 ret = soc_pcm_hw_params(substream, params);
1839 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1840 dpcm_be_dai_hw_free(fe, stream);
1842 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1845 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1846 mutex_unlock(&fe->card->mutex);
1850 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1851 struct snd_pcm_substream *substream, int cmd)
1855 dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1856 dpcm->fe->dai_link->name, cmd);
1858 ret = soc_pcm_trigger(substream, cmd);
1860 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1865 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1868 struct snd_soc_dpcm *dpcm;
1871 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1873 struct snd_soc_pcm_runtime *be = dpcm->be;
1874 struct snd_pcm_substream *be_substream =
1875 snd_soc_dpcm_get_substream(be, stream);
1877 /* is this op for this BE ? */
1878 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1882 case SNDRV_PCM_TRIGGER_START:
1883 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1884 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1887 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1891 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1893 case SNDRV_PCM_TRIGGER_RESUME:
1894 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1897 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1901 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1903 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1904 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1907 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1911 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1913 case SNDRV_PCM_TRIGGER_STOP:
1914 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1917 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1920 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1924 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1926 case SNDRV_PCM_TRIGGER_SUSPEND:
1927 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1930 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1933 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1937 be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1939 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1940 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1943 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1946 ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1950 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1957 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1959 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1961 struct snd_soc_pcm_runtime *fe = substream->private_data;
1962 int stream = substream->stream, ret;
1963 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1965 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1968 case SND_SOC_DPCM_TRIGGER_PRE:
1969 /* call trigger on the frontend before the backend. */
1971 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1972 fe->dai_link->name, cmd);
1974 ret = soc_pcm_trigger(substream, cmd);
1976 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1980 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1982 case SND_SOC_DPCM_TRIGGER_POST:
1983 /* call trigger on the frontend after the backend. */
1985 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1987 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1991 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1992 fe->dai_link->name, cmd);
1994 ret = soc_pcm_trigger(substream, cmd);
1996 case SND_SOC_DPCM_TRIGGER_BESPOKE:
1997 /* bespoke trigger() - handles both FE and BEs */
1999 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2000 fe->dai_link->name, cmd);
2002 ret = soc_pcm_bespoke_trigger(substream, cmd);
2004 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2009 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2010 fe->dai_link->name);
2016 case SNDRV_PCM_TRIGGER_START:
2017 case SNDRV_PCM_TRIGGER_RESUME:
2018 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2019 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2021 case SNDRV_PCM_TRIGGER_STOP:
2022 case SNDRV_PCM_TRIGGER_SUSPEND:
2023 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2024 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2029 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2033 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2035 struct snd_soc_pcm_runtime *fe = substream->private_data;
2036 int stream = substream->stream;
2038 /* if FE's runtime_update is already set, we're in race;
2039 * process this trigger later at exit
2041 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2042 fe->dpcm[stream].trigger_pending = cmd + 1;
2043 return 0; /* delayed, assuming it's successful */
2046 /* we're alone, let's trigger */
2047 return dpcm_fe_dai_do_trigger(substream, cmd);
2050 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2052 struct snd_soc_dpcm *dpcm;
2055 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2057 struct snd_soc_pcm_runtime *be = dpcm->be;
2058 struct snd_pcm_substream *be_substream =
2059 snd_soc_dpcm_get_substream(be, stream);
2061 /* is this op for this BE ? */
2062 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2065 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2066 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2069 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2070 dpcm->fe->dai_link->name);
2072 ret = soc_pcm_prepare(be_substream);
2074 dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2079 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2084 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2086 struct snd_soc_pcm_runtime *fe = substream->private_data;
2087 int stream = substream->stream, ret = 0;
2089 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2091 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2093 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2095 /* there is no point preparing this FE if there are no BEs */
2096 if (list_empty(&fe->dpcm[stream].be_clients)) {
2097 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2098 fe->dai_link->name);
2103 ret = dpcm_be_dai_prepare(fe, substream->stream);
2107 /* call prepare on the frontend */
2108 ret = soc_pcm_prepare(substream);
2110 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2111 fe->dai_link->name);
2115 /* run the stream event for each BE */
2116 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2117 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2120 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2121 mutex_unlock(&fe->card->mutex);
2126 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2127 unsigned int cmd, void *arg)
2129 struct snd_soc_pcm_runtime *rtd = substream->private_data;
2130 struct snd_soc_platform *platform = rtd->platform;
2132 if (platform->driver->ops && platform->driver->ops->ioctl)
2133 return platform->driver->ops->ioctl(substream, cmd, arg);
2134 return snd_pcm_lib_ioctl(substream, cmd, arg);
2137 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2139 struct snd_pcm_substream *substream =
2140 snd_soc_dpcm_get_substream(fe, stream);
2141 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2144 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2145 stream ? "capture" : "playback", fe->dai_link->name);
2147 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2148 /* call bespoke trigger - FE takes care of all BE triggers */
2149 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2150 fe->dai_link->name);
2152 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2154 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2156 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2157 fe->dai_link->name);
2159 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2161 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2164 err = dpcm_be_dai_hw_free(fe, stream);
2166 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2168 err = dpcm_be_dai_shutdown(fe, stream);
2170 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2172 /* run the stream event for each BE */
2173 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2178 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2180 struct snd_pcm_substream *substream =
2181 snd_soc_dpcm_get_substream(fe, stream);
2182 struct snd_soc_dpcm *dpcm;
2183 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2186 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2187 stream ? "capture" : "playback", fe->dai_link->name);
2189 /* Only start the BE if the FE is ready */
2190 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2191 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2194 /* startup must always be called for new BEs */
2195 ret = dpcm_be_dai_startup(fe, stream);
2199 /* keep going if FE state is > open */
2200 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2203 ret = dpcm_be_dai_hw_params(fe, stream);
2207 /* keep going if FE state is > hw_params */
2208 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2212 ret = dpcm_be_dai_prepare(fe, stream);
2216 /* run the stream event for each BE */
2217 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2219 /* keep going if FE state is > prepare */
2220 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2221 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2224 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2225 /* call trigger on the frontend - FE takes care of all BE triggers */
2226 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2227 fe->dai_link->name);
2229 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2231 dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2235 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2236 fe->dai_link->name);
2238 ret = dpcm_be_dai_trigger(fe, stream,
2239 SNDRV_PCM_TRIGGER_START);
2241 dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2249 dpcm_be_dai_hw_free(fe, stream);
2251 dpcm_be_dai_shutdown(fe, stream);
2253 /* disconnect any non started BEs */
2254 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2255 struct snd_soc_pcm_runtime *be = dpcm->be;
2256 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2257 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2263 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2267 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2268 ret = dpcm_run_update_startup(fe, stream);
2270 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2271 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2276 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2280 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2281 ret = dpcm_run_update_shutdown(fe, stream);
2283 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2284 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2289 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2292 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2294 int i, old, new, paths;
2296 mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2297 for (i = 0; i < card->num_rtd; i++) {
2298 struct snd_soc_dapm_widget_list *list;
2299 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2301 /* make sure link is FE */
2302 if (!fe->dai_link->dynamic)
2305 /* only check active links */
2306 if (!fe->cpu_dai->active)
2309 /* DAPM sync will call this to update DSP paths */
2310 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2311 fe->dai_link->name);
2313 /* skip if FE doesn't have playback capability */
2314 if (!fe->cpu_dai->driver->playback.channels_min
2315 || !fe->codec_dai->driver->playback.channels_min)
2318 /* skip if FE isn't currently playing */
2319 if (!fe->cpu_dai->playback_active
2320 || !fe->codec_dai->playback_active)
2323 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2325 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2326 fe->dai_link->name, "playback");
2327 mutex_unlock(&card->mutex);
2331 /* update any new playback paths */
2332 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2334 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2335 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2336 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2339 /* update any old playback paths */
2340 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2342 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2343 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2344 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2347 dpcm_path_put(&list);
2349 /* skip if FE doesn't have capture capability */
2350 if (!fe->cpu_dai->driver->capture.channels_min
2351 || !fe->codec_dai->driver->capture.channels_min)
2354 /* skip if FE isn't currently capturing */
2355 if (!fe->cpu_dai->capture_active
2356 || !fe->codec_dai->capture_active)
2359 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2361 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2362 fe->dai_link->name, "capture");
2363 mutex_unlock(&card->mutex);
2367 /* update any new capture paths */
2368 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2370 dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2371 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2372 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2375 /* update any old capture paths */
2376 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2378 dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2379 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2380 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2383 dpcm_path_put(&list);
2386 mutex_unlock(&card->mutex);
2389 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2391 struct snd_soc_dpcm *dpcm;
2392 struct list_head *clients =
2393 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2395 list_for_each_entry(dpcm, clients, list_be) {
2397 struct snd_soc_pcm_runtime *be = dpcm->be;
2400 if (be->dai_link->ignore_suspend)
2403 for (i = 0; i < be->num_codecs; i++) {
2404 struct snd_soc_dai *dai = be->codec_dais[i];
2405 struct snd_soc_dai_driver *drv = dai->driver;
2407 dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2408 be->dai_link->name);
2410 if (drv->ops && drv->ops->digital_mute &&
2411 dai->playback_active)
2412 drv->ops->digital_mute(dai, mute);
2419 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2421 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2422 struct snd_soc_dpcm *dpcm;
2423 struct snd_soc_dapm_widget_list *list;
2425 int stream = fe_substream->stream;
2427 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2428 fe->dpcm[stream].runtime = fe_substream->runtime;
2430 ret = dpcm_path_get(fe, stream, &list);
2432 mutex_unlock(&fe->card->mutex);
2434 } else if (ret == 0) {
2435 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2436 fe->dai_link->name, stream ? "capture" : "playback");
2439 /* calculate valid and active FE <-> BE dpcms */
2440 dpcm_process_paths(fe, stream, &list, 1);
2442 ret = dpcm_fe_dai_startup(fe_substream);
2444 /* clean up all links */
2445 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2446 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2448 dpcm_be_disconnect(fe, stream);
2449 fe->dpcm[stream].runtime = NULL;
2452 dpcm_clear_pending_state(fe, stream);
2453 dpcm_path_put(&list);
2454 mutex_unlock(&fe->card->mutex);
2458 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2460 struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2461 struct snd_soc_dpcm *dpcm;
2462 int stream = fe_substream->stream, ret;
2464 mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2465 ret = dpcm_fe_dai_shutdown(fe_substream);
2467 /* mark FE's links ready to prune */
2468 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2469 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2471 dpcm_be_disconnect(fe, stream);
2473 fe->dpcm[stream].runtime = NULL;
2474 mutex_unlock(&fe->card->mutex);
2478 /* create a new pcm */
2479 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2481 struct snd_soc_platform *platform = rtd->platform;
2482 struct snd_soc_dai *codec_dai;
2483 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2484 struct snd_pcm *pcm;
2486 int ret = 0, playback = 0, capture = 0;
2489 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2490 playback = rtd->dai_link->dpcm_playback;
2491 capture = rtd->dai_link->dpcm_capture;
2493 for (i = 0; i < rtd->num_codecs; i++) {
2494 codec_dai = rtd->codec_dais[i];
2495 if (codec_dai->driver->playback.channels_min)
2497 if (codec_dai->driver->capture.channels_min)
2501 capture = capture && cpu_dai->driver->capture.channels_min;
2502 playback = playback && cpu_dai->driver->playback.channels_min;
2505 if (rtd->dai_link->playback_only) {
2510 if (rtd->dai_link->capture_only) {
2515 /* create the PCM */
2516 if (rtd->dai_link->no_pcm) {
2517 snprintf(new_name, sizeof(new_name), "(%s)",
2518 rtd->dai_link->stream_name);
2520 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2521 playback, capture, &pcm);
2523 if (rtd->dai_link->dynamic)
2524 snprintf(new_name, sizeof(new_name), "%s (*)",
2525 rtd->dai_link->stream_name);
2527 snprintf(new_name, sizeof(new_name), "%s %s-%d",
2528 rtd->dai_link->stream_name,
2529 (rtd->num_codecs > 1) ?
2530 "multicodec" : rtd->codec_dai->name, num);
2532 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2536 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2537 rtd->dai_link->name);
2540 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2542 /* DAPM dai link stream work */
2543 INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2545 pcm->nonatomic = rtd->dai_link->nonatomic;
2547 pcm->private_data = rtd;
2549 if (rtd->dai_link->no_pcm) {
2551 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2553 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2557 /* ASoC PCM operations */
2558 if (rtd->dai_link->dynamic) {
2559 rtd->ops.open = dpcm_fe_dai_open;
2560 rtd->ops.hw_params = dpcm_fe_dai_hw_params;
2561 rtd->ops.prepare = dpcm_fe_dai_prepare;
2562 rtd->ops.trigger = dpcm_fe_dai_trigger;
2563 rtd->ops.hw_free = dpcm_fe_dai_hw_free;
2564 rtd->ops.close = dpcm_fe_dai_close;
2565 rtd->ops.pointer = soc_pcm_pointer;
2566 rtd->ops.ioctl = soc_pcm_ioctl;
2568 rtd->ops.open = soc_pcm_open;
2569 rtd->ops.hw_params = soc_pcm_hw_params;
2570 rtd->ops.prepare = soc_pcm_prepare;
2571 rtd->ops.trigger = soc_pcm_trigger;
2572 rtd->ops.hw_free = soc_pcm_hw_free;
2573 rtd->ops.close = soc_pcm_close;
2574 rtd->ops.pointer = soc_pcm_pointer;
2575 rtd->ops.ioctl = soc_pcm_ioctl;
2578 if (platform->driver->ops) {
2579 rtd->ops.ack = platform->driver->ops->ack;
2580 rtd->ops.copy = platform->driver->ops->copy;
2581 rtd->ops.silence = platform->driver->ops->silence;
2582 rtd->ops.page = platform->driver->ops->page;
2583 rtd->ops.mmap = platform->driver->ops->mmap;
2587 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2590 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2592 if (platform->driver->pcm_new) {
2593 ret = platform->driver->pcm_new(rtd);
2595 dev_err(platform->dev,
2596 "ASoC: pcm constructor failed: %d\n",
2602 pcm->private_free = platform->driver->pcm_free;
2604 dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2605 (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2610 /* is the current PCM operation for this FE ? */
2611 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2613 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2617 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2619 /* is the current PCM operation for this BE ? */
2620 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2621 struct snd_soc_pcm_runtime *be, int stream)
2623 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2624 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2625 be->dpcm[stream].runtime_update))
2629 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2631 /* get the substream for this BE */
2632 struct snd_pcm_substream *
2633 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2635 return be->pcm->streams[stream].substream;
2637 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2639 /* get the BE runtime state */
2640 enum snd_soc_dpcm_state
2641 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2643 return be->dpcm[stream].state;
2645 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2647 /* set the BE runtime state */
2648 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2649 int stream, enum snd_soc_dpcm_state state)
2651 be->dpcm[stream].state = state;
2653 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2656 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2657 * are not running, paused or suspended for the specified stream direction.
2659 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2660 struct snd_soc_pcm_runtime *be, int stream)
2662 struct snd_soc_dpcm *dpcm;
2665 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2670 state = dpcm->fe->dpcm[stream].state;
2671 if (state == SND_SOC_DPCM_STATE_START ||
2672 state == SND_SOC_DPCM_STATE_PAUSED ||
2673 state == SND_SOC_DPCM_STATE_SUSPEND)
2677 /* it's safe to free/stop this BE DAI */
2680 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2683 * We can only change hw params a BE DAI if any of it's FE are not prepared,
2684 * running, paused or suspended for the specified stream direction.
2686 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2687 struct snd_soc_pcm_runtime *be, int stream)
2689 struct snd_soc_dpcm *dpcm;
2692 list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2697 state = dpcm->fe->dpcm[stream].state;
2698 if (state == SND_SOC_DPCM_STATE_START ||
2699 state == SND_SOC_DPCM_STATE_PAUSED ||
2700 state == SND_SOC_DPCM_STATE_SUSPEND ||
2701 state == SND_SOC_DPCM_STATE_PREPARE)
2705 /* it's safe to change hw_params */
2708 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2710 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2711 int cmd, struct snd_soc_platform *platform)
2713 if (platform->driver->ops && platform->driver->ops->trigger)
2714 return platform->driver->ops->trigger(substream, cmd);
2717 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2719 #ifdef CONFIG_DEBUG_FS
2720 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2723 case SND_SOC_DPCM_STATE_NEW:
2725 case SND_SOC_DPCM_STATE_OPEN:
2727 case SND_SOC_DPCM_STATE_HW_PARAMS:
2729 case SND_SOC_DPCM_STATE_PREPARE:
2731 case SND_SOC_DPCM_STATE_START:
2733 case SND_SOC_DPCM_STATE_STOP:
2735 case SND_SOC_DPCM_STATE_SUSPEND:
2737 case SND_SOC_DPCM_STATE_PAUSED:
2739 case SND_SOC_DPCM_STATE_HW_FREE:
2741 case SND_SOC_DPCM_STATE_CLOSE:
2748 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2749 int stream, char *buf, size_t size)
2751 struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2752 struct snd_soc_dpcm *dpcm;
2756 offset += snprintf(buf + offset, size - offset,
2757 "[%s - %s]\n", fe->dai_link->name,
2758 stream ? "Capture" : "Playback");
2760 offset += snprintf(buf + offset, size - offset, "State: %s\n",
2761 dpcm_state_string(fe->dpcm[stream].state));
2763 if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2764 (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2765 offset += snprintf(buf + offset, size - offset,
2767 "Format = %s, Channels = %d, Rate = %d\n",
2768 snd_pcm_format_name(params_format(params)),
2769 params_channels(params),
2770 params_rate(params));
2773 offset += snprintf(buf + offset, size - offset, "Backends:\n");
2775 if (list_empty(&fe->dpcm[stream].be_clients)) {
2776 offset += snprintf(buf + offset, size - offset,
2777 " No active DSP links\n");
2781 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2782 struct snd_soc_pcm_runtime *be = dpcm->be;
2783 params = &dpcm->hw_params;
2785 offset += snprintf(buf + offset, size - offset,
2786 "- %s\n", be->dai_link->name);
2788 offset += snprintf(buf + offset, size - offset,
2790 dpcm_state_string(be->dpcm[stream].state));
2792 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2793 (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2794 offset += snprintf(buf + offset, size - offset,
2795 " Hardware Params: "
2796 "Format = %s, Channels = %d, Rate = %d\n",
2797 snd_pcm_format_name(params_format(params)),
2798 params_channels(params),
2799 params_rate(params));
2806 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2807 size_t count, loff_t *ppos)
2809 struct snd_soc_pcm_runtime *fe = file->private_data;
2810 ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2813 buf = kmalloc(out_count, GFP_KERNEL);
2817 if (fe->cpu_dai->driver->playback.channels_min)
2818 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2819 buf + offset, out_count - offset);
2821 if (fe->cpu_dai->driver->capture.channels_min)
2822 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2823 buf + offset, out_count - offset);
2825 ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2831 static const struct file_operations dpcm_state_fops = {
2832 .open = simple_open,
2833 .read = dpcm_state_read_file,
2834 .llseek = default_llseek,
2837 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2842 if (!rtd->card->debugfs_card_root)
2845 rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2846 rtd->card->debugfs_card_root);
2847 if (!rtd->debugfs_dpcm_root) {
2849 "ASoC: Failed to create dpcm debugfs directory %s\n",
2850 rtd->dai_link->name);
2854 rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2855 rtd->debugfs_dpcm_root,
2856 rtd, &dpcm_state_fops);