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TOMOYO Linux Cross Reference
Linux/sound/soc/soc-pcm.c

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  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                 snd_soc_dapm_stream_event(be, dir, event);
185         }
186 
187         snd_soc_dapm_stream_event(fe, dir, event);
188 
189         return 0;
190 }
191 
192 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
193                                         struct snd_soc_dai *soc_dai)
194 {
195         struct snd_soc_pcm_runtime *rtd = substream->private_data;
196         int ret;
197 
198         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
199                                 rtd->dai_link->symmetric_rates)) {
200                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
201                                 soc_dai->rate);
202 
203                 ret = snd_pcm_hw_constraint_single(substream->runtime,
204                                                 SNDRV_PCM_HW_PARAM_RATE,
205                                                 soc_dai->rate);
206                 if (ret < 0) {
207                         dev_err(soc_dai->dev,
208                                 "ASoC: Unable to apply rate constraint: %d\n",
209                                 ret);
210                         return ret;
211                 }
212         }
213 
214         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
215                                 rtd->dai_link->symmetric_channels)) {
216                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
217                                 soc_dai->channels);
218 
219                 ret = snd_pcm_hw_constraint_single(substream->runtime,
220                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
221                                                 soc_dai->channels);
222                 if (ret < 0) {
223                         dev_err(soc_dai->dev,
224                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
225                                 ret);
226                         return ret;
227                 }
228         }
229 
230         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
231                                 rtd->dai_link->symmetric_samplebits)) {
232                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
233                                 soc_dai->sample_bits);
234 
235                 ret = snd_pcm_hw_constraint_single(substream->runtime,
236                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
237                                                 soc_dai->sample_bits);
238                 if (ret < 0) {
239                         dev_err(soc_dai->dev,
240                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
241                                 ret);
242                         return ret;
243                 }
244         }
245 
246         return 0;
247 }
248 
249 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
250                                 struct snd_pcm_hw_params *params)
251 {
252         struct snd_soc_pcm_runtime *rtd = substream->private_data;
253         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
254         unsigned int rate, channels, sample_bits, symmetry, i;
255 
256         rate = params_rate(params);
257         channels = params_channels(params);
258         sample_bits = snd_pcm_format_physical_width(params_format(params));
259 
260         /* reject unmatched parameters when applying symmetry */
261         symmetry = cpu_dai->driver->symmetric_rates ||
262                 rtd->dai_link->symmetric_rates;
263 
264         for (i = 0; i < rtd->num_codecs; i++)
265                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
266 
267         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
268                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
269                                 cpu_dai->rate, rate);
270                 return -EINVAL;
271         }
272 
273         symmetry = cpu_dai->driver->symmetric_channels ||
274                 rtd->dai_link->symmetric_channels;
275 
276         for (i = 0; i < rtd->num_codecs; i++)
277                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
278 
279         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
280                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
281                                 cpu_dai->channels, channels);
282                 return -EINVAL;
283         }
284 
285         symmetry = cpu_dai->driver->symmetric_samplebits ||
286                 rtd->dai_link->symmetric_samplebits;
287 
288         for (i = 0; i < rtd->num_codecs; i++)
289                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
290 
291         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
292                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
293                                 cpu_dai->sample_bits, sample_bits);
294                 return -EINVAL;
295         }
296 
297         return 0;
298 }
299 
300 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
301 {
302         struct snd_soc_pcm_runtime *rtd = substream->private_data;
303         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
304         struct snd_soc_dai_link *link = rtd->dai_link;
305         unsigned int symmetry, i;
306 
307         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
308                 cpu_driver->symmetric_channels || link->symmetric_channels ||
309                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
310 
311         for (i = 0; i < rtd->num_codecs; i++)
312                 symmetry = symmetry ||
313                         rtd->codec_dais[i]->driver->symmetric_rates ||
314                         rtd->codec_dais[i]->driver->symmetric_channels ||
315                         rtd->codec_dais[i]->driver->symmetric_samplebits;
316 
317         return symmetry;
318 }
319 
320 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
321 {
322         struct snd_soc_pcm_runtime *rtd = substream->private_data;
323         int ret;
324 
325         if (!bits)
326                 return;
327 
328         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
329         if (ret != 0)
330                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
331                                  bits, ret);
332 }
333 
334 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
335 {
336         struct snd_soc_pcm_runtime *rtd = substream->private_data;
337         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
338         struct snd_soc_dai *codec_dai;
339         int i;
340         unsigned int bits = 0, cpu_bits;
341 
342         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
343                 for (i = 0; i < rtd->num_codecs; i++) {
344                         codec_dai = rtd->codec_dais[i];
345                         if (codec_dai->driver->playback.sig_bits == 0) {
346                                 bits = 0;
347                                 break;
348                         }
349                         bits = max(codec_dai->driver->playback.sig_bits, bits);
350                 }
351                 cpu_bits = cpu_dai->driver->playback.sig_bits;
352         } else {
353                 for (i = 0; i < rtd->num_codecs; i++) {
354                         codec_dai = rtd->codec_dais[i];
355                         if (codec_dai->driver->capture.sig_bits == 0) {
356                                 bits = 0;
357                                 break;
358                         }
359                         bits = max(codec_dai->driver->capture.sig_bits, bits);
360                 }
361                 cpu_bits = cpu_dai->driver->capture.sig_bits;
362         }
363 
364         soc_pcm_set_msb(substream, bits);
365         soc_pcm_set_msb(substream, cpu_bits);
366 }
367 
368 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
369 {
370         struct snd_pcm_runtime *runtime = substream->runtime;
371         struct snd_pcm_hardware *hw = &runtime->hw;
372         struct snd_soc_pcm_runtime *rtd = substream->private_data;
373         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
374         struct snd_soc_dai_driver *codec_dai_drv;
375         struct snd_soc_pcm_stream *codec_stream;
376         struct snd_soc_pcm_stream *cpu_stream;
377         unsigned int chan_min = 0, chan_max = UINT_MAX;
378         unsigned int rate_min = 0, rate_max = UINT_MAX;
379         unsigned int rates = UINT_MAX;
380         u64 formats = ULLONG_MAX;
381         int i;
382 
383         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
384                 cpu_stream = &cpu_dai_drv->playback;
385         else
386                 cpu_stream = &cpu_dai_drv->capture;
387 
388         /* first calculate min/max only for CODECs in the DAI link */
389         for (i = 0; i < rtd->num_codecs; i++) {
390 
391                 /*
392                  * Skip CODECs which don't support the current stream type.
393                  * Otherwise, since the rate, channel, and format values will
394                  * zero in that case, we would have no usable settings left,
395                  * causing the resulting setup to fail.
396                  * At least one CODEC should match, otherwise we should have
397                  * bailed out on a higher level, since there would be no
398                  * CODEC to support the transfer direction in that case.
399                  */
400                 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
401                                               substream->stream))
402                         continue;
403 
404                 codec_dai_drv = rtd->codec_dais[i]->driver;
405                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
406                         codec_stream = &codec_dai_drv->playback;
407                 else
408                         codec_stream = &codec_dai_drv->capture;
409                 chan_min = max(chan_min, codec_stream->channels_min);
410                 chan_max = min(chan_max, codec_stream->channels_max);
411                 rate_min = max(rate_min, codec_stream->rate_min);
412                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
413                 formats &= codec_stream->formats;
414                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
415         }
416 
417         /*
418          * chan min/max cannot be enforced if there are multiple CODEC DAIs
419          * connected to a single CPU DAI, use CPU DAI's directly and let
420          * channel allocation be fixed up later
421          */
422         if (rtd->num_codecs > 1) {
423                 chan_min = cpu_stream->channels_min;
424                 chan_max = cpu_stream->channels_max;
425         }
426 
427         hw->channels_min = max(chan_min, cpu_stream->channels_min);
428         hw->channels_max = min(chan_max, cpu_stream->channels_max);
429         if (hw->formats)
430                 hw->formats &= formats & cpu_stream->formats;
431         else
432                 hw->formats = formats & cpu_stream->formats;
433         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
434 
435         snd_pcm_limit_hw_rates(runtime);
436 
437         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
438         hw->rate_min = max(hw->rate_min, rate_min);
439         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
440         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
441 }
442 
443 /*
444  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
445  * then initialized and any private data can be allocated. This also calls
446  * startup for the cpu DAI, platform, machine and codec DAI.
447  */
448 static int soc_pcm_open(struct snd_pcm_substream *substream)
449 {
450         struct snd_soc_pcm_runtime *rtd = substream->private_data;
451         struct snd_pcm_runtime *runtime = substream->runtime;
452         struct snd_soc_platform *platform = rtd->platform;
453         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
454         struct snd_soc_dai *codec_dai;
455         const char *codec_dai_name = "multicodec";
456         int i, ret = 0;
457 
458         pinctrl_pm_select_default_state(cpu_dai->dev);
459         for (i = 0; i < rtd->num_codecs; i++)
460                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
461         pm_runtime_get_sync(cpu_dai->dev);
462         for (i = 0; i < rtd->num_codecs; i++)
463                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
464         pm_runtime_get_sync(platform->dev);
465 
466         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
467 
468         /* startup the audio subsystem */
469         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
470                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
471                 if (ret < 0) {
472                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
473                                 " %s: %d\n", cpu_dai->name, ret);
474                         goto out;
475                 }
476         }
477 
478         if (platform->driver->ops && platform->driver->ops->open) {
479                 ret = platform->driver->ops->open(substream);
480                 if (ret < 0) {
481                         dev_err(platform->dev, "ASoC: can't open platform"
482                                 " %s: %d\n", platform->component.name, ret);
483                         goto platform_err;
484                 }
485         }
486 
487         for (i = 0; i < rtd->num_codecs; i++) {
488                 codec_dai = rtd->codec_dais[i];
489                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
490                         ret = codec_dai->driver->ops->startup(substream,
491                                                               codec_dai);
492                         if (ret < 0) {
493                                 dev_err(codec_dai->dev,
494                                         "ASoC: can't open codec %s: %d\n",
495                                         codec_dai->name, ret);
496                                 goto codec_dai_err;
497                         }
498                 }
499 
500                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
501                         codec_dai->tx_mask = 0;
502                 else
503                         codec_dai->rx_mask = 0;
504         }
505 
506         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
507                 ret = rtd->dai_link->ops->startup(substream);
508                 if (ret < 0) {
509                         pr_err("ASoC: %s startup failed: %d\n",
510                                rtd->dai_link->name, ret);
511                         goto machine_err;
512                 }
513         }
514 
515         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
516         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
517                 goto dynamic;
518 
519         /* Check that the codec and cpu DAIs are compatible */
520         soc_pcm_init_runtime_hw(substream);
521 
522         if (rtd->num_codecs == 1)
523                 codec_dai_name = rtd->codec_dai->name;
524 
525         if (soc_pcm_has_symmetry(substream))
526                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
527 
528         ret = -EINVAL;
529         if (!runtime->hw.rates) {
530                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
531                         codec_dai_name, cpu_dai->name);
532                 goto config_err;
533         }
534         if (!runtime->hw.formats) {
535                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
536                         codec_dai_name, cpu_dai->name);
537                 goto config_err;
538         }
539         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
540             runtime->hw.channels_min > runtime->hw.channels_max) {
541                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
542                                 codec_dai_name, cpu_dai->name);
543                 goto config_err;
544         }
545 
546         soc_pcm_apply_msb(substream);
547 
548         /* Symmetry only applies if we've already got an active stream. */
549         if (cpu_dai->active) {
550                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
551                 if (ret != 0)
552                         goto config_err;
553         }
554 
555         for (i = 0; i < rtd->num_codecs; i++) {
556                 if (rtd->codec_dais[i]->active) {
557                         ret = soc_pcm_apply_symmetry(substream,
558                                                      rtd->codec_dais[i]);
559                         if (ret != 0)
560                                 goto config_err;
561                 }
562         }
563 
564         pr_debug("ASoC: %s <-> %s info:\n",
565                         codec_dai_name, cpu_dai->name);
566         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
567         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
568                  runtime->hw.channels_max);
569         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
570                  runtime->hw.rate_max);
571 
572 dynamic:
573 
574         snd_soc_runtime_activate(rtd, substream->stream);
575 
576         mutex_unlock(&rtd->pcm_mutex);
577         return 0;
578 
579 config_err:
580         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
581                 rtd->dai_link->ops->shutdown(substream);
582 
583 machine_err:
584         i = rtd->num_codecs;
585 
586 codec_dai_err:
587         while (--i >= 0) {
588                 codec_dai = rtd->codec_dais[i];
589                 if (codec_dai->driver->ops->shutdown)
590                         codec_dai->driver->ops->shutdown(substream, codec_dai);
591         }
592 
593         if (platform->driver->ops && platform->driver->ops->close)
594                 platform->driver->ops->close(substream);
595 
596 platform_err:
597         if (cpu_dai->driver->ops->shutdown)
598                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
599 out:
600         mutex_unlock(&rtd->pcm_mutex);
601 
602         pm_runtime_mark_last_busy(platform->dev);
603         pm_runtime_put_autosuspend(platform->dev);
604         for (i = 0; i < rtd->num_codecs; i++) {
605                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
606                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
607         }
608 
609         pm_runtime_mark_last_busy(cpu_dai->dev);
610         pm_runtime_put_autosuspend(cpu_dai->dev);
611         for (i = 0; i < rtd->num_codecs; i++) {
612                 if (!rtd->codec_dais[i]->active)
613                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
614         }
615         if (!cpu_dai->active)
616                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
617 
618         return ret;
619 }
620 
621 /*
622  * Power down the audio subsystem pmdown_time msecs after close is called.
623  * This is to ensure there are no pops or clicks in between any music tracks
624  * due to DAPM power cycling.
625  */
626 static void close_delayed_work(struct work_struct *work)
627 {
628         struct snd_soc_pcm_runtime *rtd =
629                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
630         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
631 
632         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
633 
634         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
635                  codec_dai->driver->playback.stream_name,
636                  codec_dai->playback_active ? "active" : "inactive",
637                  rtd->pop_wait ? "yes" : "no");
638 
639         /* are we waiting on this codec DAI stream */
640         if (rtd->pop_wait == 1) {
641                 rtd->pop_wait = 0;
642                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
643                                           SND_SOC_DAPM_STREAM_STOP);
644         }
645 
646         mutex_unlock(&rtd->pcm_mutex);
647 }
648 
649 /*
650  * Called by ALSA when a PCM substream is closed. Private data can be
651  * freed here. The cpu DAI, codec DAI, machine and platform are also
652  * shutdown.
653  */
654 static int soc_pcm_close(struct snd_pcm_substream *substream)
655 {
656         struct snd_soc_pcm_runtime *rtd = substream->private_data;
657         struct snd_soc_platform *platform = rtd->platform;
658         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
659         struct snd_soc_dai *codec_dai;
660         int i;
661 
662         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
663 
664         snd_soc_runtime_deactivate(rtd, substream->stream);
665 
666         /* clear the corresponding DAIs rate when inactive */
667         if (!cpu_dai->active)
668                 cpu_dai->rate = 0;
669 
670         for (i = 0; i < rtd->num_codecs; i++) {
671                 codec_dai = rtd->codec_dais[i];
672                 if (!codec_dai->active)
673                         codec_dai->rate = 0;
674         }
675 
676         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
677 
678         if (cpu_dai->driver->ops->shutdown)
679                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
680 
681         for (i = 0; i < rtd->num_codecs; i++) {
682                 codec_dai = rtd->codec_dais[i];
683                 if (codec_dai->driver->ops->shutdown)
684                         codec_dai->driver->ops->shutdown(substream, codec_dai);
685         }
686 
687         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
688                 rtd->dai_link->ops->shutdown(substream);
689 
690         if (platform->driver->ops && platform->driver->ops->close)
691                 platform->driver->ops->close(substream);
692 
693         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
694                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
695                         /* powered down playback stream now */
696                         snd_soc_dapm_stream_event(rtd,
697                                                   SNDRV_PCM_STREAM_PLAYBACK,
698                                                   SND_SOC_DAPM_STREAM_STOP);
699                 } else {
700                         /* start delayed pop wq here for playback streams */
701                         rtd->pop_wait = 1;
702                         queue_delayed_work(system_power_efficient_wq,
703                                            &rtd->delayed_work,
704                                            msecs_to_jiffies(rtd->pmdown_time));
705                 }
706         } else {
707                 /* capture streams can be powered down now */
708                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
709                                           SND_SOC_DAPM_STREAM_STOP);
710         }
711 
712         mutex_unlock(&rtd->pcm_mutex);
713 
714         pm_runtime_mark_last_busy(platform->dev);
715         pm_runtime_put_autosuspend(platform->dev);
716 
717         for (i = 0; i < rtd->num_codecs; i++) {
718                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
719                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
720         }
721 
722         pm_runtime_mark_last_busy(cpu_dai->dev);
723         pm_runtime_put_autosuspend(cpu_dai->dev);
724 
725         for (i = 0; i < rtd->num_codecs; i++) {
726                 if (!rtd->codec_dais[i]->active)
727                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
728         }
729         if (!cpu_dai->active)
730                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
731 
732         return 0;
733 }
734 
735 /*
736  * Called by ALSA when the PCM substream is prepared, can set format, sample
737  * rate, etc.  This function is non atomic and can be called multiple times,
738  * it can refer to the runtime info.
739  */
740 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
741 {
742         struct snd_soc_pcm_runtime *rtd = substream->private_data;
743         struct snd_soc_platform *platform = rtd->platform;
744         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
745         struct snd_soc_dai *codec_dai;
746         int i, ret = 0;
747 
748         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
749 
750         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
751                 ret = rtd->dai_link->ops->prepare(substream);
752                 if (ret < 0) {
753                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
754                                 " %d\n", ret);
755                         goto out;
756                 }
757         }
758 
759         if (platform->driver->ops && platform->driver->ops->prepare) {
760                 ret = platform->driver->ops->prepare(substream);
761                 if (ret < 0) {
762                         dev_err(platform->dev, "ASoC: platform prepare error:"
763                                 " %d\n", ret);
764                         goto out;
765                 }
766         }
767 
768         for (i = 0; i < rtd->num_codecs; i++) {
769                 codec_dai = rtd->codec_dais[i];
770                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
771                         ret = codec_dai->driver->ops->prepare(substream,
772                                                               codec_dai);
773                         if (ret < 0) {
774                                 dev_err(codec_dai->dev,
775                                         "ASoC: codec DAI prepare error: %d\n",
776                                         ret);
777                                 goto out;
778                         }
779                 }
780         }
781 
782         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
783                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
784                 if (ret < 0) {
785                         dev_err(cpu_dai->dev,
786                                 "ASoC: cpu DAI prepare error: %d\n", ret);
787                         goto out;
788                 }
789         }
790 
791         /* cancel any delayed stream shutdown that is pending */
792         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
793             rtd->pop_wait) {
794                 rtd->pop_wait = 0;
795                 cancel_delayed_work(&rtd->delayed_work);
796         }
797 
798         snd_soc_dapm_stream_event(rtd, substream->stream,
799                         SND_SOC_DAPM_STREAM_START);
800 
801         for (i = 0; i < rtd->num_codecs; i++)
802                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
803                                          substream->stream);
804         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
805 
806 out:
807         mutex_unlock(&rtd->pcm_mutex);
808         return ret;
809 }
810 
811 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
812                                        unsigned int mask)
813 {
814         struct snd_interval *interval;
815         int channels = hweight_long(mask);
816 
817         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
818         interval->min = channels;
819         interval->max = channels;
820 }
821 
822 int soc_dai_hw_params(struct snd_pcm_substream *substream,
823                       struct snd_pcm_hw_params *params,
824                       struct snd_soc_dai *dai)
825 {
826         int ret;
827 
828         if (dai->driver->ops && dai->driver->ops->hw_params) {
829                 ret = dai->driver->ops->hw_params(substream, params, dai);
830                 if (ret < 0) {
831                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
832                                 dai->name, ret);
833                         return ret;
834                 }
835         }
836 
837         return 0;
838 }
839 
840 /*
841  * Called by ALSA when the hardware params are set by application. This
842  * function can also be called multiple times and can allocate buffers
843  * (using snd_pcm_lib_* ). It's non-atomic.
844  */
845 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
846                                 struct snd_pcm_hw_params *params)
847 {
848         struct snd_soc_pcm_runtime *rtd = substream->private_data;
849         struct snd_soc_platform *platform = rtd->platform;
850         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
851         int i, ret = 0;
852 
853         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
854 
855         ret = soc_pcm_params_symmetry(substream, params);
856         if (ret)
857                 goto out;
858 
859         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
860                 ret = rtd->dai_link->ops->hw_params(substream, params);
861                 if (ret < 0) {
862                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
863                                 " failed: %d\n", ret);
864                         goto out;
865                 }
866         }
867 
868         for (i = 0; i < rtd->num_codecs; i++) {
869                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
870                 struct snd_pcm_hw_params codec_params;
871 
872                 /*
873                  * Skip CODECs which don't support the current stream type,
874                  * the idea being that if a CODEC is not used for the currently
875                  * set up transfer direction, it should not need to be
876                  * configured, especially since the configuration used might
877                  * not even be supported by that CODEC. There may be cases
878                  * however where a CODEC needs to be set up although it is
879                  * actually not being used for the transfer, e.g. if a
880                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
881                  * for the DAI link including a playback-only CODEC.
882                  * If this becomes necessary, we will have to augment the
883                  * machine driver setup with information on how to act, so
884                  * we can do the right thing here.
885                  */
886                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
887                         continue;
888 
889                 /* copy params for each codec */
890                 codec_params = *params;
891 
892                 /* fixup params based on TDM slot masks */
893                 if (codec_dai->tx_mask)
894                         soc_pcm_codec_params_fixup(&codec_params,
895                                                    codec_dai->tx_mask);
896                 if (codec_dai->rx_mask)
897                         soc_pcm_codec_params_fixup(&codec_params,
898                                                    codec_dai->rx_mask);
899 
900                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
901                 if(ret < 0)
902                         goto codec_err;
903 
904                 codec_dai->rate = params_rate(&codec_params);
905                 codec_dai->channels = params_channels(&codec_params);
906                 codec_dai->sample_bits = snd_pcm_format_physical_width(
907                                                 params_format(&codec_params));
908         }
909 
910         ret = soc_dai_hw_params(substream, params, cpu_dai);
911         if (ret < 0)
912                 goto interface_err;
913 
914         if (platform->driver->ops && platform->driver->ops->hw_params) {
915                 ret = platform->driver->ops->hw_params(substream, params);
916                 if (ret < 0) {
917                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
918                                platform->component.name, ret);
919                         goto platform_err;
920                 }
921         }
922 
923         /* store the parameters for each DAIs */
924         cpu_dai->rate = params_rate(params);
925         cpu_dai->channels = params_channels(params);
926         cpu_dai->sample_bits =
927                 snd_pcm_format_physical_width(params_format(params));
928 
929 out:
930         mutex_unlock(&rtd->pcm_mutex);
931         return ret;
932 
933 platform_err:
934         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
935                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
936 
937 interface_err:
938         i = rtd->num_codecs;
939 
940 codec_err:
941         while (--i >= 0) {
942                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
943                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
944                         codec_dai->driver->ops->hw_free(substream, codec_dai);
945                 codec_dai->rate = 0;
946         }
947 
948         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
949                 rtd->dai_link->ops->hw_free(substream);
950 
951         mutex_unlock(&rtd->pcm_mutex);
952         return ret;
953 }
954 
955 /*
956  * Frees resources allocated by hw_params, can be called multiple times
957  */
958 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
959 {
960         struct snd_soc_pcm_runtime *rtd = substream->private_data;
961         struct snd_soc_platform *platform = rtd->platform;
962         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
963         struct snd_soc_dai *codec_dai;
964         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
965         int i;
966 
967         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
968 
969         /* clear the corresponding DAIs parameters when going to be inactive */
970         if (cpu_dai->active == 1) {
971                 cpu_dai->rate = 0;
972                 cpu_dai->channels = 0;
973                 cpu_dai->sample_bits = 0;
974         }
975 
976         for (i = 0; i < rtd->num_codecs; i++) {
977                 codec_dai = rtd->codec_dais[i];
978                 if (codec_dai->active == 1) {
979                         codec_dai->rate = 0;
980                         codec_dai->channels = 0;
981                         codec_dai->sample_bits = 0;
982                 }
983         }
984 
985         /* apply codec digital mute */
986         for (i = 0; i < rtd->num_codecs; i++) {
987                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
988                     (!playback && rtd->codec_dais[i]->capture_active == 1))
989                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
990                                                  substream->stream);
991         }
992 
993         /* free any machine hw params */
994         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
995                 rtd->dai_link->ops->hw_free(substream);
996 
997         /* free any DMA resources */
998         if (platform->driver->ops && platform->driver->ops->hw_free)
999                 platform->driver->ops->hw_free(substream);
1000 
1001         /* now free hw params for the DAIs  */
1002         for (i = 0; i < rtd->num_codecs; i++) {
1003                 codec_dai = rtd->codec_dais[i];
1004                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1005                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1006         }
1007 
1008         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1009                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1010 
1011         mutex_unlock(&rtd->pcm_mutex);
1012         return 0;
1013 }
1014 
1015 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1016 {
1017         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1018         struct snd_soc_platform *platform = rtd->platform;
1019         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1020         struct snd_soc_dai *codec_dai;
1021         int i, ret;
1022 
1023         for (i = 0; i < rtd->num_codecs; i++) {
1024                 codec_dai = rtd->codec_dais[i];
1025                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1026                         ret = codec_dai->driver->ops->trigger(substream,
1027                                                               cmd, codec_dai);
1028                         if (ret < 0)
1029                                 return ret;
1030                 }
1031         }
1032 
1033         if (platform->driver->ops && platform->driver->ops->trigger) {
1034                 ret = platform->driver->ops->trigger(substream, cmd);
1035                 if (ret < 0)
1036                         return ret;
1037         }
1038 
1039         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1040                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1041                 if (ret < 0)
1042                         return ret;
1043         }
1044 
1045         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1046                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1047                 if (ret < 0)
1048                         return ret;
1049         }
1050 
1051         return 0;
1052 }
1053 
1054 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1055                                    int cmd)
1056 {
1057         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1058         struct snd_soc_platform *platform = rtd->platform;
1059         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1060         struct snd_soc_dai *codec_dai;
1061         int i, ret;
1062 
1063         for (i = 0; i < rtd->num_codecs; i++) {
1064                 codec_dai = rtd->codec_dais[i];
1065                 if (codec_dai->driver->ops &&
1066                     codec_dai->driver->ops->bespoke_trigger) {
1067                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1068                                                                 cmd, codec_dai);
1069                         if (ret < 0)
1070                                 return ret;
1071                 }
1072         }
1073 
1074         if (platform->driver->bespoke_trigger) {
1075                 ret = platform->driver->bespoke_trigger(substream, cmd);
1076                 if (ret < 0)
1077                         return ret;
1078         }
1079 
1080         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1081                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1082                 if (ret < 0)
1083                         return ret;
1084         }
1085         return 0;
1086 }
1087 /*
1088  * soc level wrapper for pointer callback
1089  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1090  * the runtime->delay will be updated accordingly.
1091  */
1092 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1093 {
1094         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1095         struct snd_soc_platform *platform = rtd->platform;
1096         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1097         struct snd_soc_dai *codec_dai;
1098         struct snd_pcm_runtime *runtime = substream->runtime;
1099         snd_pcm_uframes_t offset = 0;
1100         snd_pcm_sframes_t delay = 0;
1101         snd_pcm_sframes_t codec_delay = 0;
1102         int i;
1103 
1104         if (platform->driver->ops && platform->driver->ops->pointer)
1105                 offset = platform->driver->ops->pointer(substream);
1106 
1107         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1108                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1109 
1110         for (i = 0; i < rtd->num_codecs; i++) {
1111                 codec_dai = rtd->codec_dais[i];
1112                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1113                         codec_delay = max(codec_delay,
1114                                         codec_dai->driver->ops->delay(substream,
1115                                                                     codec_dai));
1116         }
1117         delay += codec_delay;
1118 
1119         /*
1120          * None of the existing platform drivers implement delay(), so
1121          * for now the codec_dai of first multicodec entry is used
1122          */
1123         if (platform->driver->delay)
1124                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1125 
1126         runtime->delay = delay;
1127 
1128         return offset;
1129 }
1130 
1131 /* connect a FE and BE */
1132 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1133                 struct snd_soc_pcm_runtime *be, int stream)
1134 {
1135         struct snd_soc_dpcm *dpcm;
1136 
1137         /* only add new dpcms */
1138         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1139                 if (dpcm->be == be && dpcm->fe == fe)
1140                         return 0;
1141         }
1142 
1143         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1144         if (!dpcm)
1145                 return -ENOMEM;
1146 
1147         dpcm->be = be;
1148         dpcm->fe = fe;
1149         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1150         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1151         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1152         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1153 
1154         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1155                         stream ? "capture" : "playback",  fe->dai_link->name,
1156                         stream ? "<-" : "->", be->dai_link->name);
1157 
1158 #ifdef CONFIG_DEBUG_FS
1159         if (fe->debugfs_dpcm_root)
1160                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1161                                 fe->debugfs_dpcm_root, &dpcm->state);
1162 #endif
1163         return 1;
1164 }
1165 
1166 /* reparent a BE onto another FE */
1167 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1168                         struct snd_soc_pcm_runtime *be, int stream)
1169 {
1170         struct snd_soc_dpcm *dpcm;
1171         struct snd_pcm_substream *fe_substream, *be_substream;
1172 
1173         /* reparent if BE is connected to other FEs */
1174         if (!be->dpcm[stream].users)
1175                 return;
1176 
1177         be_substream = snd_soc_dpcm_get_substream(be, stream);
1178 
1179         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1180                 if (dpcm->fe == fe)
1181                         continue;
1182 
1183                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1184                         stream ? "capture" : "playback",
1185                         dpcm->fe->dai_link->name,
1186                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1187 
1188                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1189                 be_substream->runtime = fe_substream->runtime;
1190                 break;
1191         }
1192 }
1193 
1194 /* disconnect a BE and FE */
1195 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1196 {
1197         struct snd_soc_dpcm *dpcm, *d;
1198 
1199         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1200                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1201                                 stream ? "capture" : "playback",
1202                                 dpcm->be->dai_link->name);
1203 
1204                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1205                         continue;
1206 
1207                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1208                         stream ? "capture" : "playback", fe->dai_link->name,
1209                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1210 
1211                 /* BEs still alive need new FE */
1212                 dpcm_be_reparent(fe, dpcm->be, stream);
1213 
1214 #ifdef CONFIG_DEBUG_FS
1215                 debugfs_remove(dpcm->debugfs_state);
1216 #endif
1217                 list_del(&dpcm->list_be);
1218                 list_del(&dpcm->list_fe);
1219                 kfree(dpcm);
1220         }
1221 }
1222 
1223 /* get BE for DAI widget and stream */
1224 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1225                 struct snd_soc_dapm_widget *widget, int stream)
1226 {
1227         struct snd_soc_pcm_runtime *be;
1228         int i;
1229 
1230         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1231                 list_for_each_entry(be, &card->rtd_list, list) {
1232 
1233                         if (!be->dai_link->no_pcm)
1234                                 continue;
1235 
1236                         if (be->cpu_dai->playback_widget == widget)
1237                                 return be;
1238 
1239                         for (i = 0; i < be->num_codecs; i++) {
1240                                 struct snd_soc_dai *dai = be->codec_dais[i];
1241                                 if (dai->playback_widget == widget)
1242                                         return be;
1243                         }
1244                 }
1245         } else {
1246 
1247                 list_for_each_entry(be, &card->rtd_list, list) {
1248 
1249                         if (!be->dai_link->no_pcm)
1250                                 continue;
1251 
1252                         if (be->cpu_dai->capture_widget == widget)
1253                                 return be;
1254 
1255                         for (i = 0; i < be->num_codecs; i++) {
1256                                 struct snd_soc_dai *dai = be->codec_dais[i];
1257                                 if (dai->capture_widget == widget)
1258                                         return be;
1259                         }
1260                 }
1261         }
1262 
1263         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1264                 stream ? "capture" : "playback", widget->name);
1265         return NULL;
1266 }
1267 
1268 static inline struct snd_soc_dapm_widget *
1269         dai_get_widget(struct snd_soc_dai *dai, int stream)
1270 {
1271         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1272                 return dai->playback_widget;
1273         else
1274                 return dai->capture_widget;
1275 }
1276 
1277 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1278                 struct snd_soc_dapm_widget *widget)
1279 {
1280         int i;
1281 
1282         for (i = 0; i < list->num_widgets; i++) {
1283                 if (widget == list->widgets[i])
1284                         return 1;
1285         }
1286 
1287         return 0;
1288 }
1289 
1290 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1291                 enum snd_soc_dapm_direction dir)
1292 {
1293         struct snd_soc_card *card = widget->dapm->card;
1294         struct snd_soc_pcm_runtime *rtd;
1295         int i;
1296 
1297         if (dir == SND_SOC_DAPM_DIR_OUT) {
1298                 list_for_each_entry(rtd, &card->rtd_list, list) {
1299                         if (!rtd->dai_link->no_pcm)
1300                                 continue;
1301 
1302                         if (rtd->cpu_dai->playback_widget == widget)
1303                                 return true;
1304 
1305                         for (i = 0; i < rtd->num_codecs; ++i) {
1306                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1307                                 if (dai->playback_widget == widget)
1308                                         return true;
1309                         }
1310                 }
1311         } else { /* SND_SOC_DAPM_DIR_IN */
1312                 list_for_each_entry(rtd, &card->rtd_list, list) {
1313                         if (!rtd->dai_link->no_pcm)
1314                                 continue;
1315 
1316                         if (rtd->cpu_dai->capture_widget == widget)
1317                                 return true;
1318 
1319                         for (i = 0; i < rtd->num_codecs; ++i) {
1320                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1321                                 if (dai->capture_widget == widget)
1322                                         return true;
1323                         }
1324                 }
1325         }
1326 
1327         return false;
1328 }
1329 
1330 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1331         int stream, struct snd_soc_dapm_widget_list **list)
1332 {
1333         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1334         int paths;
1335 
1336         /* get number of valid DAI paths and their widgets */
1337         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1338                         dpcm_end_walk_at_be);
1339 
1340         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1341                         stream ? "capture" : "playback");
1342 
1343         return paths;
1344 }
1345 
1346 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1347         struct snd_soc_dapm_widget_list **list_)
1348 {
1349         struct snd_soc_dpcm *dpcm;
1350         struct snd_soc_dapm_widget_list *list = *list_;
1351         struct snd_soc_dapm_widget *widget;
1352         int prune = 0;
1353 
1354         /* Destroy any old FE <--> BE connections */
1355         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1356                 unsigned int i;
1357 
1358                 /* is there a valid CPU DAI widget for this BE */
1359                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1360 
1361                 /* prune the BE if it's no longer in our active list */
1362                 if (widget && widget_in_list(list, widget))
1363                         continue;
1364 
1365                 /* is there a valid CODEC DAI widget for this BE */
1366                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1367                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1368                         widget = dai_get_widget(dai, stream);
1369 
1370                         /* prune the BE if it's no longer in our active list */
1371                         if (widget && widget_in_list(list, widget))
1372                                 continue;
1373                 }
1374 
1375                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1376                         stream ? "capture" : "playback",
1377                         dpcm->be->dai_link->name, fe->dai_link->name);
1378                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1379                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1380                 prune++;
1381         }
1382 
1383         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1384         return prune;
1385 }
1386 
1387 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1388         struct snd_soc_dapm_widget_list **list_)
1389 {
1390         struct snd_soc_card *card = fe->card;
1391         struct snd_soc_dapm_widget_list *list = *list_;
1392         struct snd_soc_pcm_runtime *be;
1393         int i, new = 0, err;
1394 
1395         /* Create any new FE <--> BE connections */
1396         for (i = 0; i < list->num_widgets; i++) {
1397 
1398                 switch (list->widgets[i]->id) {
1399                 case snd_soc_dapm_dai_in:
1400                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1401                                 continue;
1402                         break;
1403                 case snd_soc_dapm_dai_out:
1404                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1405                                 continue;
1406                         break;
1407                 default:
1408                         continue;
1409                 }
1410 
1411                 /* is there a valid BE rtd for this widget */
1412                 be = dpcm_get_be(card, list->widgets[i], stream);
1413                 if (!be) {
1414                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1415                                         list->widgets[i]->name);
1416                         continue;
1417                 }
1418 
1419                 /* make sure BE is a real BE */
1420                 if (!be->dai_link->no_pcm)
1421                         continue;
1422 
1423                 /* don't connect if FE is not running */
1424                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1425                         continue;
1426 
1427                 /* newly connected FE and BE */
1428                 err = dpcm_be_connect(fe, be, stream);
1429                 if (err < 0) {
1430                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1431                                 list->widgets[i]->name);
1432                         break;
1433                 } else if (err == 0) /* already connected */
1434                         continue;
1435 
1436                 /* new */
1437                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1438                 new++;
1439         }
1440 
1441         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1442         return new;
1443 }
1444 
1445 /*
1446  * Find the corresponding BE DAIs that source or sink audio to this
1447  * FE substream.
1448  */
1449 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1450         int stream, struct snd_soc_dapm_widget_list **list, int new)
1451 {
1452         if (new)
1453                 return dpcm_add_paths(fe, stream, list);
1454         else
1455                 return dpcm_prune_paths(fe, stream, list);
1456 }
1457 
1458 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1459 {
1460         struct snd_soc_dpcm *dpcm;
1461 
1462         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1463                 dpcm->be->dpcm[stream].runtime_update =
1464                                                 SND_SOC_DPCM_UPDATE_NO;
1465 }
1466 
1467 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1468         int stream)
1469 {
1470         struct snd_soc_dpcm *dpcm;
1471 
1472         /* disable any enabled and non active backends */
1473         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1474 
1475                 struct snd_soc_pcm_runtime *be = dpcm->be;
1476                 struct snd_pcm_substream *be_substream =
1477                         snd_soc_dpcm_get_substream(be, stream);
1478 
1479                 if (be->dpcm[stream].users == 0)
1480                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1481                                 stream ? "capture" : "playback",
1482                                 be->dpcm[stream].state);
1483 
1484                 if (--be->dpcm[stream].users != 0)
1485                         continue;
1486 
1487                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1488                         continue;
1489 
1490                 soc_pcm_close(be_substream);
1491                 be_substream->runtime = NULL;
1492                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1493         }
1494 }
1495 
1496 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1497 {
1498         struct snd_soc_dpcm *dpcm;
1499         int err, count = 0;
1500 
1501         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1502         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1503 
1504                 struct snd_soc_pcm_runtime *be = dpcm->be;
1505                 struct snd_pcm_substream *be_substream =
1506                         snd_soc_dpcm_get_substream(be, stream);
1507 
1508                 if (!be_substream) {
1509                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1510                                 stream ? "capture" : "playback");
1511                         continue;
1512                 }
1513 
1514                 /* is this op for this BE ? */
1515                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1516                         continue;
1517 
1518                 /* first time the dpcm is open ? */
1519                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1520                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1521                                 stream ? "capture" : "playback",
1522                                 be->dpcm[stream].state);
1523 
1524                 if (be->dpcm[stream].users++ != 0)
1525                         continue;
1526 
1527                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1528                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1529                         continue;
1530 
1531                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1532                         stream ? "capture" : "playback", be->dai_link->name);
1533 
1534                 be_substream->runtime = be->dpcm[stream].runtime;
1535                 err = soc_pcm_open(be_substream);
1536                 if (err < 0) {
1537                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1538                         be->dpcm[stream].users--;
1539                         if (be->dpcm[stream].users < 0)
1540                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1541                                         stream ? "capture" : "playback",
1542                                         be->dpcm[stream].state);
1543 
1544                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1545                         goto unwind;
1546                 }
1547 
1548                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1549                 count++;
1550         }
1551 
1552         return count;
1553 
1554 unwind:
1555         /* disable any enabled and non active backends */
1556         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1557                 struct snd_soc_pcm_runtime *be = dpcm->be;
1558                 struct snd_pcm_substream *be_substream =
1559                         snd_soc_dpcm_get_substream(be, stream);
1560 
1561                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1562                         continue;
1563 
1564                 if (be->dpcm[stream].users == 0)
1565                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1566                                 stream ? "capture" : "playback",
1567                                 be->dpcm[stream].state);
1568 
1569                 if (--be->dpcm[stream].users != 0)
1570                         continue;
1571 
1572                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1573                         continue;
1574 
1575                 soc_pcm_close(be_substream);
1576                 be_substream->runtime = NULL;
1577                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1578         }
1579 
1580         return err;
1581 }
1582 
1583 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1584                                  struct snd_soc_pcm_stream *stream,
1585                                  u64 formats)
1586 {
1587         runtime->hw.rate_min = stream->rate_min;
1588         runtime->hw.rate_max = stream->rate_max;
1589         runtime->hw.channels_min = stream->channels_min;
1590         runtime->hw.channels_max = stream->channels_max;
1591         if (runtime->hw.formats)
1592                 runtime->hw.formats &= formats & stream->formats;
1593         else
1594                 runtime->hw.formats = formats & stream->formats;
1595         runtime->hw.rates = stream->rates;
1596 }
1597 
1598 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1599 {
1600         struct snd_soc_pcm_runtime *fe = substream->private_data;
1601         struct snd_soc_dpcm *dpcm;
1602         u64 formats = ULLONG_MAX;
1603         int stream = substream->stream;
1604 
1605         if (!fe->dai_link->dpcm_merged_format)
1606                 return formats;
1607 
1608         /*
1609          * It returns merged BE codec format
1610          * if FE want to use it (= dpcm_merged_format)
1611          */
1612 
1613         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1614                 struct snd_soc_pcm_runtime *be = dpcm->be;
1615                 struct snd_soc_dai_driver *codec_dai_drv;
1616                 struct snd_soc_pcm_stream *codec_stream;
1617                 int i;
1618 
1619                 for (i = 0; i < be->num_codecs; i++) {
1620                         codec_dai_drv = be->codec_dais[i]->driver;
1621                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1622                                 codec_stream = &codec_dai_drv->playback;
1623                         else
1624                                 codec_stream = &codec_dai_drv->capture;
1625 
1626                         formats &= codec_stream->formats;
1627                 }
1628         }
1629 
1630         return formats;
1631 }
1632 
1633 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1634 {
1635         struct snd_pcm_runtime *runtime = substream->runtime;
1636         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1637         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1638         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1639         u64 format = dpcm_runtime_base_format(substream);
1640 
1641         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1642                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1643         else
1644                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1645 }
1646 
1647 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1648 
1649 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1650  * for avoiding the race with trigger callback.
1651  * If the state is unset and a trigger is pending while the previous operation,
1652  * process the pending trigger action here.
1653  */
1654 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1655                                      int stream, enum snd_soc_dpcm_update state)
1656 {
1657         struct snd_pcm_substream *substream =
1658                 snd_soc_dpcm_get_substream(fe, stream);
1659 
1660         snd_pcm_stream_lock_irq(substream);
1661         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1662                 dpcm_fe_dai_do_trigger(substream,
1663                                        fe->dpcm[stream].trigger_pending - 1);
1664                 fe->dpcm[stream].trigger_pending = 0;
1665         }
1666         fe->dpcm[stream].runtime_update = state;
1667         snd_pcm_stream_unlock_irq(substream);
1668 }
1669 
1670 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1671                                int stream)
1672 {
1673         struct snd_soc_dpcm *dpcm;
1674         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1675         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1676         int err;
1677 
1678         /* apply symmetry for FE */
1679         if (soc_pcm_has_symmetry(fe_substream))
1680                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1681 
1682         /* Symmetry only applies if we've got an active stream. */
1683         if (fe_cpu_dai->active) {
1684                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1685                 if (err < 0)
1686                         return err;
1687         }
1688 
1689         /* apply symmetry for BE */
1690         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1691                 struct snd_soc_pcm_runtime *be = dpcm->be;
1692                 struct snd_pcm_substream *be_substream =
1693                         snd_soc_dpcm_get_substream(be, stream);
1694                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1695                 int i;
1696 
1697                 if (rtd->dai_link->be_hw_params_fixup)
1698                         continue;
1699 
1700                 if (soc_pcm_has_symmetry(be_substream))
1701                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1702 
1703                 /* Symmetry only applies if we've got an active stream. */
1704                 if (rtd->cpu_dai->active) {
1705                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1706                         if (err < 0)
1707                                 return err;
1708                 }
1709 
1710                 for (i = 0; i < rtd->num_codecs; i++) {
1711                         if (rtd->codec_dais[i]->active) {
1712                                 err = soc_pcm_apply_symmetry(be_substream,
1713                                                              rtd->codec_dais[i]);
1714                                 if (err < 0)
1715                                         return err;
1716                         }
1717                 }
1718         }
1719 
1720         return 0;
1721 }
1722 
1723 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1724 {
1725         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1726         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1727         int stream = fe_substream->stream, ret = 0;
1728 
1729         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1730 
1731         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1732         if (ret < 0) {
1733                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1734                 goto be_err;
1735         }
1736 
1737         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1738 
1739         /* start the DAI frontend */
1740         ret = soc_pcm_open(fe_substream);
1741         if (ret < 0) {
1742                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1743                 goto unwind;
1744         }
1745 
1746         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1747 
1748         dpcm_set_fe_runtime(fe_substream);
1749         snd_pcm_limit_hw_rates(runtime);
1750 
1751         ret = dpcm_apply_symmetry(fe_substream, stream);
1752         if (ret < 0) {
1753                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1754                         ret);
1755                 goto unwind;
1756         }
1757 
1758         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1759         return 0;
1760 
1761 unwind:
1762         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1763 be_err:
1764         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1765         return ret;
1766 }
1767 
1768 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1769 {
1770         struct snd_soc_dpcm *dpcm;
1771 
1772         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1773         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1774 
1775                 struct snd_soc_pcm_runtime *be = dpcm->be;
1776                 struct snd_pcm_substream *be_substream =
1777                         snd_soc_dpcm_get_substream(be, stream);
1778 
1779                 /* is this op for this BE ? */
1780                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1781                         continue;
1782 
1783                 if (be->dpcm[stream].users == 0)
1784                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1785                                 stream ? "capture" : "playback",
1786                                 be->dpcm[stream].state);
1787 
1788                 if (--be->dpcm[stream].users != 0)
1789                         continue;
1790 
1791                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1792                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1793                         continue;
1794 
1795                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1796                         be->dai_link->name);
1797 
1798                 soc_pcm_close(be_substream);
1799                 be_substream->runtime = NULL;
1800 
1801                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1802         }
1803         return 0;
1804 }
1805 
1806 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1807 {
1808         struct snd_soc_pcm_runtime *fe = substream->private_data;
1809         int stream = substream->stream;
1810 
1811         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1812 
1813         /* shutdown the BEs */
1814         dpcm_be_dai_shutdown(fe, substream->stream);
1815 
1816         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1817 
1818         /* now shutdown the frontend */
1819         soc_pcm_close(substream);
1820 
1821         /* run the stream event for each BE */
1822         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1823 
1824         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1825         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1826         return 0;
1827 }
1828 
1829 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1830 {
1831         struct snd_soc_dpcm *dpcm;
1832 
1833         /* only hw_params backends that are either sinks or sources
1834          * to this frontend DAI */
1835         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1836 
1837                 struct snd_soc_pcm_runtime *be = dpcm->be;
1838                 struct snd_pcm_substream *be_substream =
1839                         snd_soc_dpcm_get_substream(be, stream);
1840 
1841                 /* is this op for this BE ? */
1842                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1843                         continue;
1844 
1845                 /* only free hw when no longer used - check all FEs */
1846                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1847                                 continue;
1848 
1849                 /* do not free hw if this BE is used by other FE */
1850                 if (be->dpcm[stream].users > 1)
1851                         continue;
1852 
1853                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1854                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1855                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1856                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1857                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1858                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1859                         continue;
1860 
1861                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1862                         be->dai_link->name);
1863 
1864                 soc_pcm_hw_free(be_substream);
1865 
1866                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1867         }
1868 
1869         return 0;
1870 }
1871 
1872 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1873 {
1874         struct snd_soc_pcm_runtime *fe = substream->private_data;
1875         int err, stream = substream->stream;
1876 
1877         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1878         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1879 
1880         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1881 
1882         /* call hw_free on the frontend */
1883         err = soc_pcm_hw_free(substream);
1884         if (err < 0)
1885                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1886                         fe->dai_link->name);
1887 
1888         /* only hw_params backends that are either sinks or sources
1889          * to this frontend DAI */
1890         err = dpcm_be_dai_hw_free(fe, stream);
1891 
1892         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1893         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1894 
1895         mutex_unlock(&fe->card->mutex);
1896         return 0;
1897 }
1898 
1899 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1900 {
1901         struct snd_soc_dpcm *dpcm;
1902         int ret;
1903 
1904         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1905 
1906                 struct snd_soc_pcm_runtime *be = dpcm->be;
1907                 struct snd_pcm_substream *be_substream =
1908                         snd_soc_dpcm_get_substream(be, stream);
1909 
1910                 /* is this op for this BE ? */
1911                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1912                         continue;
1913 
1914                 /* copy params for each dpcm */
1915                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1916                                 sizeof(struct snd_pcm_hw_params));
1917 
1918                 /* perform any hw_params fixups */
1919                 if (be->dai_link->be_hw_params_fixup) {
1920                         ret = be->dai_link->be_hw_params_fixup(be,
1921                                         &dpcm->hw_params);
1922                         if (ret < 0) {
1923                                 dev_err(be->dev,
1924                                         "ASoC: hw_params BE fixup failed %d\n",
1925                                         ret);
1926                                 goto unwind;
1927                         }
1928                 }
1929 
1930                 /* only allow hw_params() if no connected FEs are running */
1931                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1932                         continue;
1933 
1934                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1935                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1936                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1937                         continue;
1938 
1939                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1940                         be->dai_link->name);
1941 
1942                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1943                 if (ret < 0) {
1944                         dev_err(dpcm->be->dev,
1945                                 "ASoC: hw_params BE failed %d\n", ret);
1946                         goto unwind;
1947                 }
1948 
1949                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1950         }
1951         return 0;
1952 
1953 unwind:
1954         /* disable any enabled and non active backends */
1955         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1956                 struct snd_soc_pcm_runtime *be = dpcm->be;
1957                 struct snd_pcm_substream *be_substream =
1958                         snd_soc_dpcm_get_substream(be, stream);
1959 
1960                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1961                         continue;
1962 
1963                 /* only allow hw_free() if no connected FEs are running */
1964                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1965                         continue;
1966 
1967                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1968                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1969                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1970                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1971                         continue;
1972 
1973                 soc_pcm_hw_free(be_substream);
1974         }
1975 
1976         return ret;
1977 }
1978 
1979 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1980                                  struct snd_pcm_hw_params *params)
1981 {
1982         struct snd_soc_pcm_runtime *fe = substream->private_data;
1983         int ret, stream = substream->stream;
1984 
1985         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1986         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1987 
1988         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1989                         sizeof(struct snd_pcm_hw_params));
1990         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1991         if (ret < 0) {
1992                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1993                 goto out;
1994         }
1995 
1996         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1997                         fe->dai_link->name, params_rate(params),
1998                         params_channels(params), params_format(params));
1999 
2000         /* call hw_params on the frontend */
2001         ret = soc_pcm_hw_params(substream, params);
2002         if (ret < 0) {
2003                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2004                 dpcm_be_dai_hw_free(fe, stream);
2005          } else
2006                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2007 
2008 out:
2009         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2010         mutex_unlock(&fe->card->mutex);
2011         return ret;
2012 }
2013 
2014 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2015                 struct snd_pcm_substream *substream, int cmd)
2016 {
2017         int ret;
2018 
2019         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2020                         dpcm->be->dai_link->name, cmd);
2021 
2022         ret = soc_pcm_trigger(substream, cmd);
2023         if (ret < 0)
2024                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2025 
2026         return ret;
2027 }
2028 
2029 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2030                                int cmd)
2031 {
2032         struct snd_soc_dpcm *dpcm;
2033         int ret = 0;
2034 
2035         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2036 
2037                 struct snd_soc_pcm_runtime *be = dpcm->be;
2038                 struct snd_pcm_substream *be_substream =
2039                         snd_soc_dpcm_get_substream(be, stream);
2040 
2041                 /* is this op for this BE ? */
2042                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2043                         continue;
2044 
2045                 switch (cmd) {
2046                 case SNDRV_PCM_TRIGGER_START:
2047                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2048                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
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_RESUME:
2058                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
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_PAUSE_RELEASE:
2068                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2069                                 continue;
2070 
2071                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2072                         if (ret)
2073                                 return ret;
2074 
2075                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2076                         break;
2077                 case SNDRV_PCM_TRIGGER_STOP:
2078                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2079                                 continue;
2080 
2081                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2082                                 continue;
2083 
2084                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2085                         if (ret)
2086                                 return ret;
2087 
2088                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2089                         break;
2090                 case SNDRV_PCM_TRIGGER_SUSPEND:
2091                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2092                                 continue;
2093 
2094                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2095                                 continue;
2096 
2097                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2098                         if (ret)
2099                                 return ret;
2100 
2101                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2102                         break;
2103                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2104                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2105                                 continue;
2106 
2107                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2108                                 continue;
2109 
2110                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2111                         if (ret)
2112                                 return ret;
2113 
2114                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2115                         break;
2116                 }
2117         }
2118 
2119         return ret;
2120 }
2121 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2122 
2123 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2124 {
2125         struct snd_soc_pcm_runtime *fe = substream->private_data;
2126         int stream = substream->stream, ret;
2127         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2128 
2129         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2130 
2131         switch (trigger) {
2132         case SND_SOC_DPCM_TRIGGER_PRE:
2133                 /* call trigger on the frontend before the backend. */
2134 
2135                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2136                                 fe->dai_link->name, cmd);
2137 
2138                 ret = soc_pcm_trigger(substream, cmd);
2139                 if (ret < 0) {
2140                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2141                         goto out;
2142                 }
2143 
2144                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2145                 break;
2146         case SND_SOC_DPCM_TRIGGER_POST:
2147                 /* call trigger on the frontend after the backend. */
2148 
2149                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2150                 if (ret < 0) {
2151                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2152                         goto out;
2153                 }
2154 
2155                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2156                                 fe->dai_link->name, cmd);
2157 
2158                 ret = soc_pcm_trigger(substream, cmd);
2159                 break;
2160         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2161                 /* bespoke trigger() - handles both FE and BEs */
2162 
2163                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2164                                 fe->dai_link->name, cmd);
2165 
2166                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2167                 if (ret < 0) {
2168                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2169                         goto out;
2170                 }
2171                 break;
2172         default:
2173                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2174                                 fe->dai_link->name);
2175                 ret = -EINVAL;
2176                 goto out;
2177         }
2178 
2179         switch (cmd) {
2180         case SNDRV_PCM_TRIGGER_START:
2181         case SNDRV_PCM_TRIGGER_RESUME:
2182         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2183                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2184                 break;
2185         case SNDRV_PCM_TRIGGER_STOP:
2186         case SNDRV_PCM_TRIGGER_SUSPEND:
2187                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2188                 break;
2189         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2190                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2191                 break;
2192         }
2193 
2194 out:
2195         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2196         return ret;
2197 }
2198 
2199 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2200 {
2201         struct snd_soc_pcm_runtime *fe = substream->private_data;
2202         int stream = substream->stream;
2203 
2204         /* if FE's runtime_update is already set, we're in race;
2205          * process this trigger later at exit
2206          */
2207         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2208                 fe->dpcm[stream].trigger_pending = cmd + 1;
2209                 return 0; /* delayed, assuming it's successful */
2210         }
2211 
2212         /* we're alone, let's trigger */
2213         return dpcm_fe_dai_do_trigger(substream, cmd);
2214 }
2215 
2216 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2217 {
2218         struct snd_soc_dpcm *dpcm;
2219         int ret = 0;
2220 
2221         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2222 
2223                 struct snd_soc_pcm_runtime *be = dpcm->be;
2224                 struct snd_pcm_substream *be_substream =
2225                         snd_soc_dpcm_get_substream(be, stream);
2226 
2227                 /* is this op for this BE ? */
2228                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2229                         continue;
2230 
2231                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2232                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2233                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2234                         continue;
2235 
2236                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2237                         be->dai_link->name);
2238 
2239                 ret = soc_pcm_prepare(be_substream);
2240                 if (ret < 0) {
2241                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2242                                 ret);
2243                         break;
2244                 }
2245 
2246                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2247         }
2248         return ret;
2249 }
2250 
2251 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2252 {
2253         struct snd_soc_pcm_runtime *fe = substream->private_data;
2254         int stream = substream->stream, ret = 0;
2255 
2256         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2257 
2258         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2259 
2260         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2261 
2262         /* there is no point preparing this FE if there are no BEs */
2263         if (list_empty(&fe->dpcm[stream].be_clients)) {
2264                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2265                                 fe->dai_link->name);
2266                 ret = -EINVAL;
2267                 goto out;
2268         }
2269 
2270         ret = dpcm_be_dai_prepare(fe, substream->stream);
2271         if (ret < 0)
2272                 goto out;
2273 
2274         /* call prepare on the frontend */
2275         ret = soc_pcm_prepare(substream);
2276         if (ret < 0) {
2277                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2278                         fe->dai_link->name);
2279                 goto out;
2280         }
2281 
2282         /* run the stream event for each BE */
2283         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2284         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2285 
2286 out:
2287         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2288         mutex_unlock(&fe->card->mutex);
2289 
2290         return ret;
2291 }
2292 
2293 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2294                      unsigned int cmd, void *arg)
2295 {
2296         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2297         struct snd_soc_platform *platform = rtd->platform;
2298 
2299         if (platform->driver->ops && platform->driver->ops->ioctl)
2300                 return platform->driver->ops->ioctl(substream, cmd, arg);
2301         return snd_pcm_lib_ioctl(substream, cmd, arg);
2302 }
2303 
2304 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2305 {
2306         struct snd_pcm_substream *substream =
2307                 snd_soc_dpcm_get_substream(fe, stream);
2308         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2309         int err;
2310 
2311         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2312                         stream ? "capture" : "playback", fe->dai_link->name);
2313 
2314         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2315                 /* call bespoke trigger - FE takes care of all BE triggers */
2316                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2317                                 fe->dai_link->name);
2318 
2319                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2320                 if (err < 0)
2321                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2322         } else {
2323                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2324                         fe->dai_link->name);
2325 
2326                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2327                 if (err < 0)
2328                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2329         }
2330 
2331         err = dpcm_be_dai_hw_free(fe, stream);
2332         if (err < 0)
2333                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2334 
2335         err = dpcm_be_dai_shutdown(fe, stream);
2336         if (err < 0)
2337                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2338 
2339         /* run the stream event for each BE */
2340         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2341 
2342         return 0;
2343 }
2344 
2345 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2346 {
2347         struct snd_pcm_substream *substream =
2348                 snd_soc_dpcm_get_substream(fe, stream);
2349         struct snd_soc_dpcm *dpcm;
2350         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2351         int ret;
2352 
2353         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2354                         stream ? "capture" : "playback", fe->dai_link->name);
2355 
2356         /* Only start the BE if the FE is ready */
2357         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2358                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2359                 return -EINVAL;
2360 
2361         /* startup must always be called for new BEs */
2362         ret = dpcm_be_dai_startup(fe, stream);
2363         if (ret < 0)
2364                 goto disconnect;
2365 
2366         /* keep going if FE state is > open */
2367         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2368                 return 0;
2369 
2370         ret = dpcm_be_dai_hw_params(fe, stream);
2371         if (ret < 0)
2372                 goto close;
2373 
2374         /* keep going if FE state is > hw_params */
2375         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2376                 return 0;
2377 
2378 
2379         ret = dpcm_be_dai_prepare(fe, stream);
2380         if (ret < 0)
2381                 goto hw_free;
2382 
2383         /* run the stream event for each BE */
2384         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2385 
2386         /* keep going if FE state is > prepare */
2387         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2388                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2389                 return 0;
2390 
2391         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2392                 /* call trigger on the frontend - FE takes care of all BE triggers */
2393                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2394                                 fe->dai_link->name);
2395 
2396                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2397                 if (ret < 0) {
2398                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2399                         goto hw_free;
2400                 }
2401         } else {
2402                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2403                         fe->dai_link->name);
2404 
2405                 ret = dpcm_be_dai_trigger(fe, stream,
2406                                         SNDRV_PCM_TRIGGER_START);
2407                 if (ret < 0) {
2408                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2409                         goto hw_free;
2410                 }
2411         }
2412 
2413         return 0;
2414 
2415 hw_free:
2416         dpcm_be_dai_hw_free(fe, stream);
2417 close:
2418         dpcm_be_dai_shutdown(fe, stream);
2419 disconnect:
2420         /* disconnect any non started BEs */
2421         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2422                 struct snd_soc_pcm_runtime *be = dpcm->be;
2423                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2424                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2425         }
2426 
2427         return ret;
2428 }
2429 
2430 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2431 {
2432         int ret;
2433 
2434         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2435         ret = dpcm_run_update_startup(fe, stream);
2436         if (ret < 0)
2437                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2438         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2439 
2440         return ret;
2441 }
2442 
2443 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2444 {
2445         int ret;
2446 
2447         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2448         ret = dpcm_run_update_shutdown(fe, stream);
2449         if (ret < 0)
2450                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2451         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2452 
2453         return ret;
2454 }
2455 
2456 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2457  * any DAI links.
2458  */
2459 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2460 {
2461         struct snd_soc_pcm_runtime *fe;
2462         int old, new, paths;
2463 
2464         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2465         list_for_each_entry(fe, &card->rtd_list, list) {
2466                 struct snd_soc_dapm_widget_list *list;
2467 
2468                 /* make sure link is FE */
2469                 if (!fe->dai_link->dynamic)
2470                         continue;
2471 
2472                 /* only check active links */
2473                 if (!fe->cpu_dai->active)
2474                         continue;
2475 
2476                 /* DAPM sync will call this to update DSP paths */
2477                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2478                         fe->dai_link->name);
2479 
2480                 /* skip if FE doesn't have playback capability */
2481                 if (!fe->cpu_dai->driver->playback.channels_min
2482                     || !fe->codec_dai->driver->playback.channels_min)
2483                         goto capture;
2484 
2485                 /* skip if FE isn't currently playing */
2486                 if (!fe->cpu_dai->playback_active
2487                     || !fe->codec_dai->playback_active)
2488                         goto capture;
2489 
2490                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2491                 if (paths < 0) {
2492                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2493                                         fe->dai_link->name,  "playback");
2494                         mutex_unlock(&card->mutex);
2495                         return paths;
2496                 }
2497 
2498                 /* update any new playback paths */
2499                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2500                 if (new) {
2501                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2502                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2503                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2504                 }
2505 
2506                 /* update any old playback paths */
2507                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2508                 if (old) {
2509                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2510                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2511                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2512                 }
2513 
2514                 dpcm_path_put(&list);
2515 capture:
2516                 /* skip if FE doesn't have capture capability */
2517                 if (!fe->cpu_dai->driver->capture.channels_min
2518                     || !fe->codec_dai->driver->capture.channels_min)
2519                         continue;
2520 
2521                 /* skip if FE isn't currently capturing */
2522                 if (!fe->cpu_dai->capture_active
2523                     || !fe->codec_dai->capture_active)
2524                         continue;
2525 
2526                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2527                 if (paths < 0) {
2528                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2529                                         fe->dai_link->name,  "capture");
2530                         mutex_unlock(&card->mutex);
2531                         return paths;
2532                 }
2533 
2534                 /* update any new capture paths */
2535                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2536                 if (new) {
2537                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2538                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2539                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2540                 }
2541 
2542                 /* update any old capture paths */
2543                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2544                 if (old) {
2545                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2546                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2547                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2548                 }
2549 
2550                 dpcm_path_put(&list);
2551         }
2552 
2553         mutex_unlock(&card->mutex);
2554         return 0;
2555 }
2556 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2557 {
2558         struct snd_soc_dpcm *dpcm;
2559         struct list_head *clients =
2560                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2561 
2562         list_for_each_entry(dpcm, clients, list_be) {
2563 
2564                 struct snd_soc_pcm_runtime *be = dpcm->be;
2565                 int i;
2566 
2567                 if (be->dai_link->ignore_suspend)
2568                         continue;
2569 
2570                 for (i = 0; i < be->num_codecs; i++) {
2571                         struct snd_soc_dai *dai = be->codec_dais[i];
2572                         struct snd_soc_dai_driver *drv = dai->driver;
2573 
2574                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2575                                          be->dai_link->name);
2576 
2577                         if (drv->ops && drv->ops->digital_mute &&
2578                                                         dai->playback_active)
2579                                 drv->ops->digital_mute(dai, mute);
2580                 }
2581         }
2582 
2583         return 0;
2584 }
2585 
2586 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2587 {
2588         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2589         struct snd_soc_dpcm *dpcm;
2590         struct snd_soc_dapm_widget_list *list;
2591         int ret;
2592         int stream = fe_substream->stream;
2593 
2594         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2595         fe->dpcm[stream].runtime = fe_substream->runtime;
2596 
2597         ret = dpcm_path_get(fe, stream, &list);
2598         if (ret < 0) {
2599                 mutex_unlock(&fe->card->mutex);
2600                 return ret;
2601         } else if (ret == 0) {
2602                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2603                         fe->dai_link->name, stream ? "capture" : "playback");
2604         }
2605 
2606         /* calculate valid and active FE <-> BE dpcms */
2607         dpcm_process_paths(fe, stream, &list, 1);
2608 
2609         ret = dpcm_fe_dai_startup(fe_substream);
2610         if (ret < 0) {
2611                 /* clean up all links */
2612                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2613                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2614 
2615                 dpcm_be_disconnect(fe, stream);
2616                 fe->dpcm[stream].runtime = NULL;
2617         }
2618 
2619         dpcm_clear_pending_state(fe, stream);
2620         dpcm_path_put(&list);
2621         mutex_unlock(&fe->card->mutex);
2622         return ret;
2623 }
2624 
2625 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2626 {
2627         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2628         struct snd_soc_dpcm *dpcm;
2629         int stream = fe_substream->stream, ret;
2630 
2631         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2632         ret = dpcm_fe_dai_shutdown(fe_substream);
2633 
2634         /* mark FE's links ready to prune */
2635         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2636                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2637 
2638         dpcm_be_disconnect(fe, stream);
2639 
2640         fe->dpcm[stream].runtime = NULL;
2641         mutex_unlock(&fe->card->mutex);
2642         return ret;
2643 }
2644 
2645 /* create a new pcm */
2646 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2647 {
2648         struct snd_soc_platform *platform = rtd->platform;
2649         struct snd_soc_dai *codec_dai;
2650         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2651         struct snd_pcm *pcm;
2652         char new_name[64];
2653         int ret = 0, playback = 0, capture = 0;
2654         int i;
2655 
2656         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2657                 playback = rtd->dai_link->dpcm_playback;
2658                 capture = rtd->dai_link->dpcm_capture;
2659         } else {
2660                 for (i = 0; i < rtd->num_codecs; i++) {
2661                         codec_dai = rtd->codec_dais[i];
2662                         if (codec_dai->driver->playback.channels_min)
2663                                 playback = 1;
2664                         if (codec_dai->driver->capture.channels_min)
2665                                 capture = 1;
2666                 }
2667 
2668                 capture = capture && cpu_dai->driver->capture.channels_min;
2669                 playback = playback && cpu_dai->driver->playback.channels_min;
2670         }
2671 
2672         if (rtd->dai_link->playback_only) {
2673                 playback = 1;
2674                 capture = 0;
2675         }
2676 
2677         if (rtd->dai_link->capture_only) {
2678                 playback = 0;
2679                 capture = 1;
2680         }
2681 
2682         /* create the PCM */
2683         if (rtd->dai_link->no_pcm) {
2684                 snprintf(new_name, sizeof(new_name), "(%s)",
2685                         rtd->dai_link->stream_name);
2686 
2687                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2688                                 playback, capture, &pcm);
2689         } else {
2690                 if (rtd->dai_link->dynamic)
2691                         snprintf(new_name, sizeof(new_name), "%s (*)",
2692                                 rtd->dai_link->stream_name);
2693                 else
2694                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2695                                 rtd->dai_link->stream_name,
2696                                 (rtd->num_codecs > 1) ?
2697                                 "multicodec" : rtd->codec_dai->name, num);
2698 
2699                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2700                         capture, &pcm);
2701         }
2702         if (ret < 0) {
2703                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2704                         rtd->dai_link->name);
2705                 return ret;
2706         }
2707         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2708 
2709         /* DAPM dai link stream work */
2710         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2711 
2712         pcm->nonatomic = rtd->dai_link->nonatomic;
2713         rtd->pcm = pcm;
2714         pcm->private_data = rtd;
2715 
2716         if (rtd->dai_link->no_pcm) {
2717                 if (playback)
2718                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2719                 if (capture)
2720                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2721                 goto out;
2722         }
2723 
2724         /* ASoC PCM operations */
2725         if (rtd->dai_link->dynamic) {
2726                 rtd->ops.open           = dpcm_fe_dai_open;
2727                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2728                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2729                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2730                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2731                 rtd->ops.close          = dpcm_fe_dai_close;
2732                 rtd->ops.pointer        = soc_pcm_pointer;
2733                 rtd->ops.ioctl          = soc_pcm_ioctl;
2734         } else {
2735                 rtd->ops.open           = soc_pcm_open;
2736                 rtd->ops.hw_params      = soc_pcm_hw_params;
2737                 rtd->ops.prepare        = soc_pcm_prepare;
2738                 rtd->ops.trigger        = soc_pcm_trigger;
2739                 rtd->ops.hw_free        = soc_pcm_hw_free;
2740                 rtd->ops.close          = soc_pcm_close;
2741                 rtd->ops.pointer        = soc_pcm_pointer;
2742                 rtd->ops.ioctl          = soc_pcm_ioctl;
2743         }
2744 
2745         if (platform->driver->ops) {
2746                 rtd->ops.ack            = platform->driver->ops->ack;
2747                 rtd->ops.copy           = platform->driver->ops->copy;
2748                 rtd->ops.silence        = platform->driver->ops->silence;
2749                 rtd->ops.page           = platform->driver->ops->page;
2750                 rtd->ops.mmap           = platform->driver->ops->mmap;
2751         }
2752 
2753         if (playback)
2754                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2755 
2756         if (capture)
2757                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2758 
2759         if (platform->driver->pcm_new) {
2760                 ret = platform->driver->pcm_new(rtd);
2761                 if (ret < 0) {
2762                         dev_err(platform->dev,
2763                                 "ASoC: pcm constructor failed: %d\n",
2764                                 ret);
2765                         return ret;
2766                 }
2767         }
2768 
2769         pcm->private_free = platform->driver->pcm_free;
2770 out:
2771         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2772                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2773                  cpu_dai->name);
2774         return ret;
2775 }
2776 
2777 /* is the current PCM operation for this FE ? */
2778 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2779 {
2780         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2781                 return 1;
2782         return 0;
2783 }
2784 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2785 
2786 /* is the current PCM operation for this BE ? */
2787 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2788                 struct snd_soc_pcm_runtime *be, int stream)
2789 {
2790         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2791            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2792                   be->dpcm[stream].runtime_update))
2793                 return 1;
2794         return 0;
2795 }
2796 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2797 
2798 /* get the substream for this BE */
2799 struct snd_pcm_substream *
2800         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2801 {
2802         return be->pcm->streams[stream].substream;
2803 }
2804 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2805 
2806 /* get the BE runtime state */
2807 enum snd_soc_dpcm_state
2808         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2809 {
2810         return be->dpcm[stream].state;
2811 }
2812 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2813 
2814 /* set the BE runtime state */
2815 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2816                 int stream, enum snd_soc_dpcm_state state)
2817 {
2818         be->dpcm[stream].state = state;
2819 }
2820 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2821 
2822 /*
2823  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2824  * are not running, paused or suspended for the specified stream direction.
2825  */
2826 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2827                 struct snd_soc_pcm_runtime *be, int stream)
2828 {
2829         struct snd_soc_dpcm *dpcm;
2830         int state;
2831 
2832         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2833 
2834                 if (dpcm->fe == fe)
2835                         continue;
2836 
2837                 state = dpcm->fe->dpcm[stream].state;
2838                 if (state == SND_SOC_DPCM_STATE_START ||
2839                         state == SND_SOC_DPCM_STATE_PAUSED ||
2840                         state == SND_SOC_DPCM_STATE_SUSPEND)
2841                         return 0;
2842         }
2843 
2844         /* it's safe to free/stop this BE DAI */
2845         return 1;
2846 }
2847 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2848 
2849 /*
2850  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2851  * running, paused or suspended for the specified stream direction.
2852  */
2853 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2854                 struct snd_soc_pcm_runtime *be, int stream)
2855 {
2856         struct snd_soc_dpcm *dpcm;
2857         int state;
2858 
2859         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2860 
2861                 if (dpcm->fe == fe)
2862                         continue;
2863 
2864                 state = dpcm->fe->dpcm[stream].state;
2865                 if (state == SND_SOC_DPCM_STATE_START ||
2866                         state == SND_SOC_DPCM_STATE_PAUSED ||
2867                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2868                         state == SND_SOC_DPCM_STATE_PREPARE)
2869                         return 0;
2870         }
2871 
2872         /* it's safe to change hw_params */
2873         return 1;
2874 }
2875 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2876 
2877 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2878                 int cmd, struct snd_soc_platform *platform)
2879 {
2880         if (platform->driver->ops && platform->driver->ops->trigger)
2881                 return platform->driver->ops->trigger(substream, cmd);
2882         return 0;
2883 }
2884 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2885 
2886 #ifdef CONFIG_DEBUG_FS
2887 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2888 {
2889         switch (state) {
2890         case SND_SOC_DPCM_STATE_NEW:
2891                 return "new";
2892         case SND_SOC_DPCM_STATE_OPEN:
2893                 return "open";
2894         case SND_SOC_DPCM_STATE_HW_PARAMS:
2895                 return "hw_params";
2896         case SND_SOC_DPCM_STATE_PREPARE:
2897                 return "prepare";
2898         case SND_SOC_DPCM_STATE_START:
2899                 return "start";
2900         case SND_SOC_DPCM_STATE_STOP:
2901                 return "stop";
2902         case SND_SOC_DPCM_STATE_SUSPEND:
2903                 return "suspend";
2904         case SND_SOC_DPCM_STATE_PAUSED:
2905                 return "paused";
2906         case SND_SOC_DPCM_STATE_HW_FREE:
2907                 return "hw_free";
2908         case SND_SOC_DPCM_STATE_CLOSE:
2909                 return "close";
2910         }
2911 
2912         return "unknown";
2913 }
2914 
2915 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2916                                 int stream, char *buf, size_t size)
2917 {
2918         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2919         struct snd_soc_dpcm *dpcm;
2920         ssize_t offset = 0;
2921 
2922         /* FE state */
2923         offset += snprintf(buf + offset, size - offset,
2924                         "[%s - %s]\n", fe->dai_link->name,
2925                         stream ? "Capture" : "Playback");
2926 
2927         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2928                         dpcm_state_string(fe->dpcm[stream].state));
2929 
2930         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2931             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2932                 offset += snprintf(buf + offset, size - offset,
2933                                 "Hardware Params: "
2934                                 "Format = %s, Channels = %d, Rate = %d\n",
2935                                 snd_pcm_format_name(params_format(params)),
2936                                 params_channels(params),
2937                                 params_rate(params));
2938 
2939         /* BEs state */
2940         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2941 
2942         if (list_empty(&fe->dpcm[stream].be_clients)) {
2943                 offset += snprintf(buf + offset, size - offset,
2944                                 " No active DSP links\n");
2945                 goto out;
2946         }
2947 
2948         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2949                 struct snd_soc_pcm_runtime *be = dpcm->be;
2950                 params = &dpcm->hw_params;
2951 
2952                 offset += snprintf(buf + offset, size - offset,
2953                                 "- %s\n", be->dai_link->name);
2954 
2955                 offset += snprintf(buf + offset, size - offset,
2956                                 "   State: %s\n",
2957                                 dpcm_state_string(be->dpcm[stream].state));
2958 
2959                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2960                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2961                         offset += snprintf(buf + offset, size - offset,
2962                                 "   Hardware Params: "
2963                                 "Format = %s, Channels = %d, Rate = %d\n",
2964                                 snd_pcm_format_name(params_format(params)),
2965                                 params_channels(params),
2966                                 params_rate(params));
2967         }
2968 
2969 out:
2970         return offset;
2971 }
2972 
2973 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2974                                 size_t count, loff_t *ppos)
2975 {
2976         struct snd_soc_pcm_runtime *fe = file->private_data;
2977         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2978         char *buf;
2979 
2980         buf = kmalloc(out_count, GFP_KERNEL);
2981         if (!buf)
2982                 return -ENOMEM;
2983 
2984         if (fe->cpu_dai->driver->playback.channels_min)
2985                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2986                                         buf + offset, out_count - offset);
2987 
2988         if (fe->cpu_dai->driver->capture.channels_min)
2989                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2990                                         buf + offset, out_count - offset);
2991 
2992         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2993 
2994         kfree(buf);
2995         return ret;
2996 }
2997 
2998 static const struct file_operations dpcm_state_fops = {
2999         .open = simple_open,
3000         .read = dpcm_state_read_file,
3001         .llseek = default_llseek,
3002 };
3003 
3004 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3005 {
3006         if (!rtd->dai_link)
3007                 return;
3008 
3009         if (!rtd->card->debugfs_card_root)
3010                 return;
3011 
3012         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3013                         rtd->card->debugfs_card_root);
3014         if (!rtd->debugfs_dpcm_root) {
3015                 dev_dbg(rtd->dev,
3016                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3017                          rtd->dai_link->name);
3018                 return;
3019         }
3020 
3021         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3022                                                 rtd->debugfs_dpcm_root,
3023                                                 rtd, &dpcm_state_fops);
3024 }
3025 #endif
3026 

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