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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/pm_runtime.h>
 23 #include <linux/slab.h>
 24 #include <linux/workqueue.h>
 25 #include <linux/export.h>
 26 #include <linux/debugfs.h>
 27 #include <sound/core.h>
 28 #include <sound/pcm.h>
 29 #include <sound/pcm_params.h>
 30 #include <sound/soc.h>
 31 #include <sound/soc-dpcm.h>
 32 #include <sound/initval.h>
 33 
 34 #define DPCM_MAX_BE_USERS       8
 35 
 36 /**
 37  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 38  * @substream: the pcm substream
 39  * @hw: the hardware parameters
 40  *
 41  * Sets the substream runtime hardware parameters.
 42  */
 43 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 44         const struct snd_pcm_hardware *hw)
 45 {
 46         struct snd_pcm_runtime *runtime = substream->runtime;
 47         runtime->hw.info = hw->info;
 48         runtime->hw.formats = hw->formats;
 49         runtime->hw.period_bytes_min = hw->period_bytes_min;
 50         runtime->hw.period_bytes_max = hw->period_bytes_max;
 51         runtime->hw.periods_min = hw->periods_min;
 52         runtime->hw.periods_max = hw->periods_max;
 53         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 54         runtime->hw.fifo_size = hw->fifo_size;
 55         return 0;
 56 }
 57 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 58 
 59 /* DPCM stream event, send event to FE and all active BEs. */
 60 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 61         int event)
 62 {
 63         struct snd_soc_dpcm *dpcm;
 64 
 65         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
 66 
 67                 struct snd_soc_pcm_runtime *be = dpcm->be;
 68 
 69                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 70                                 be->dai_link->name, event, dir);
 71 
 72                 snd_soc_dapm_stream_event(be, dir, event);
 73         }
 74 
 75         snd_soc_dapm_stream_event(fe, dir, event);
 76 
 77         return 0;
 78 }
 79 
 80 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 81                                         struct snd_soc_dai *soc_dai)
 82 {
 83         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 84         int ret;
 85 
 86         if (!soc_dai->driver->symmetric_rates &&
 87             !rtd->dai_link->symmetric_rates)
 88                 return 0;
 89 
 90         /* This can happen if multiple streams are starting simultaneously -
 91          * the second can need to get its constraints before the first has
 92          * picked a rate.  Complain and allow the application to carry on.
 93          */
 94         if (!soc_dai->rate) {
 95                 dev_warn(soc_dai->dev,
 96                          "ASoC: Not enforcing symmetric_rates due to race\n");
 97                 return 0;
 98         }
 99 
100         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
101 
102         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
103                                            SNDRV_PCM_HW_PARAM_RATE,
104                                            soc_dai->rate, soc_dai->rate);
105         if (ret < 0) {
106                 dev_err(soc_dai->dev,
107                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
108                         ret);
109                 return ret;
110         }
111 
112         return 0;
113 }
114 
115 /*
116  * List of sample sizes that might go over the bus for parameter
117  * application.  There ought to be a wildcard sample size for things
118  * like the DAC/ADC resolution to use but there isn't right now.
119  */
120 static int sample_sizes[] = {
121         24, 32,
122 };
123 
124 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
125                               struct snd_soc_dai *dai)
126 {
127         int ret, i, bits;
128 
129         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
130                 bits = dai->driver->playback.sig_bits;
131         else
132                 bits = dai->driver->capture.sig_bits;
133 
134         if (!bits)
135                 return;
136 
137         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
138                 if (bits >= sample_sizes[i])
139                         continue;
140 
141                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
142                                                    sample_sizes[i], bits);
143                 if (ret != 0)
144                         dev_warn(dai->dev,
145                                  "ASoC: Failed to set MSB %d/%d: %d\n",
146                                  bits, sample_sizes[i], ret);
147         }
148 }
149 
150 static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,
151         struct snd_soc_pcm_stream *codec_stream,
152         struct snd_soc_pcm_stream *cpu_stream)
153 {
154         hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);
155         hw->rate_max = max(codec_stream->rate_max, cpu_stream->rate_max);
156         hw->channels_min = max(codec_stream->channels_min,
157                 cpu_stream->channels_min);
158         hw->channels_max = min(codec_stream->channels_max,
159                 cpu_stream->channels_max);
160         hw->formats = codec_stream->formats & cpu_stream->formats;
161         hw->rates = codec_stream->rates & cpu_stream->rates;
162         if (codec_stream->rates
163                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
164                 hw->rates |= cpu_stream->rates;
165         if (cpu_stream->rates
166                 & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
167                 hw->rates |= codec_stream->rates;
168 }
169 
170 /*
171  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
172  * then initialized and any private data can be allocated. This also calls
173  * startup for the cpu DAI, platform, machine and codec DAI.
174  */
175 static int soc_pcm_open(struct snd_pcm_substream *substream)
176 {
177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
178         struct snd_pcm_runtime *runtime = substream->runtime;
179         struct snd_soc_platform *platform = rtd->platform;
180         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
181         struct snd_soc_dai *codec_dai = rtd->codec_dai;
182         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
183         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
184         int ret = 0;
185 
186         pm_runtime_get_sync(cpu_dai->dev);
187         pm_runtime_get_sync(codec_dai->dev);
188         pm_runtime_get_sync(platform->dev);
189 
190         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
191 
192         /* startup the audio subsystem */
193         if (cpu_dai->driver->ops->startup) {
194                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
195                 if (ret < 0) {
196                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
197                                 " %s: %d\n", cpu_dai->name, ret);
198                         goto out;
199                 }
200         }
201 
202         if (platform->driver->ops && platform->driver->ops->open) {
203                 ret = platform->driver->ops->open(substream);
204                 if (ret < 0) {
205                         dev_err(platform->dev, "ASoC: can't open platform"
206                                 " %s: %d\n", platform->name, ret);
207                         goto platform_err;
208                 }
209         }
210 
211         if (codec_dai->driver->ops->startup) {
212                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
213                 if (ret < 0) {
214                         dev_err(codec_dai->dev, "ASoC: can't open codec"
215                                 " %s: %d\n", codec_dai->name, ret);
216                         goto codec_dai_err;
217                 }
218         }
219 
220         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
221                 ret = rtd->dai_link->ops->startup(substream);
222                 if (ret < 0) {
223                         pr_err("ASoC: %s startup failed: %d\n",
224                                rtd->dai_link->name, ret);
225                         goto machine_err;
226                 }
227         }
228 
229         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
230         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
231                 goto dynamic;
232 
233         /* Check that the codec and cpu DAIs are compatible */
234         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
235                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,
236                         &cpu_dai_drv->playback);
237         } else {
238                 soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,
239                         &cpu_dai_drv->capture);
240         }
241 
242         ret = -EINVAL;
243         snd_pcm_limit_hw_rates(runtime);
244         if (!runtime->hw.rates) {
245                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
246                         codec_dai->name, cpu_dai->name);
247                 goto config_err;
248         }
249         if (!runtime->hw.formats) {
250                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
251                         codec_dai->name, cpu_dai->name);
252                 goto config_err;
253         }
254         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
255             runtime->hw.channels_min > runtime->hw.channels_max) {
256                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
257                                 codec_dai->name, cpu_dai->name);
258                 goto config_err;
259         }
260 
261         soc_pcm_apply_msb(substream, codec_dai);
262         soc_pcm_apply_msb(substream, cpu_dai);
263 
264         /* Symmetry only applies if we've already got an active stream. */
265         if (cpu_dai->active) {
266                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
267                 if (ret != 0)
268                         goto config_err;
269         }
270 
271         if (codec_dai->active) {
272                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
273                 if (ret != 0)
274                         goto config_err;
275         }
276 
277         pr_debug("ASoC: %s <-> %s info:\n",
278                         codec_dai->name, cpu_dai->name);
279         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
280         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
281                  runtime->hw.channels_max);
282         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
283                  runtime->hw.rate_max);
284 
285 dynamic:
286         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
287                 cpu_dai->playback_active++;
288                 codec_dai->playback_active++;
289         } else {
290                 cpu_dai->capture_active++;
291                 codec_dai->capture_active++;
292         }
293         cpu_dai->active++;
294         codec_dai->active++;
295         rtd->codec->active++;
296         mutex_unlock(&rtd->pcm_mutex);
297         return 0;
298 
299 config_err:
300         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
301                 rtd->dai_link->ops->shutdown(substream);
302 
303 machine_err:
304         if (codec_dai->driver->ops->shutdown)
305                 codec_dai->driver->ops->shutdown(substream, codec_dai);
306 
307 codec_dai_err:
308         if (platform->driver->ops && platform->driver->ops->close)
309                 platform->driver->ops->close(substream);
310 
311 platform_err:
312         if (cpu_dai->driver->ops->shutdown)
313                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
314 out:
315         mutex_unlock(&rtd->pcm_mutex);
316 
317         pm_runtime_put(platform->dev);
318         pm_runtime_put(codec_dai->dev);
319         pm_runtime_put(cpu_dai->dev);
320 
321         return ret;
322 }
323 
324 /*
325  * Power down the audio subsystem pmdown_time msecs after close is called.
326  * This is to ensure there are no pops or clicks in between any music tracks
327  * due to DAPM power cycling.
328  */
329 static void close_delayed_work(struct work_struct *work)
330 {
331         struct snd_soc_pcm_runtime *rtd =
332                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
333         struct snd_soc_dai *codec_dai = rtd->codec_dai;
334 
335         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
336 
337         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
338                  codec_dai->driver->playback.stream_name,
339                  codec_dai->playback_active ? "active" : "inactive",
340                  rtd->pop_wait ? "yes" : "no");
341 
342         /* are we waiting on this codec DAI stream */
343         if (rtd->pop_wait == 1) {
344                 rtd->pop_wait = 0;
345                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
346                                           SND_SOC_DAPM_STREAM_STOP);
347         }
348 
349         mutex_unlock(&rtd->pcm_mutex);
350 }
351 
352 /*
353  * Called by ALSA when a PCM substream is closed. Private data can be
354  * freed here. The cpu DAI, codec DAI, machine and platform are also
355  * shutdown.
356  */
357 static int soc_pcm_close(struct snd_pcm_substream *substream)
358 {
359         struct snd_soc_pcm_runtime *rtd = substream->private_data;
360         struct snd_soc_platform *platform = rtd->platform;
361         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
362         struct snd_soc_dai *codec_dai = rtd->codec_dai;
363         struct snd_soc_codec *codec = rtd->codec;
364 
365         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
366 
367         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
368                 cpu_dai->playback_active--;
369                 codec_dai->playback_active--;
370         } else {
371                 cpu_dai->capture_active--;
372                 codec_dai->capture_active--;
373         }
374 
375         cpu_dai->active--;
376         codec_dai->active--;
377         codec->active--;
378 
379         /* clear the corresponding DAIs rate when inactive */
380         if (!cpu_dai->active)
381                 cpu_dai->rate = 0;
382 
383         if (!codec_dai->active)
384                 codec_dai->rate = 0;
385 
386         /* Muting the DAC suppresses artifacts caused during digital
387          * shutdown, for example from stopping clocks.
388          */
389         snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
390 
391         if (cpu_dai->driver->ops->shutdown)
392                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
393 
394         if (codec_dai->driver->ops->shutdown)
395                 codec_dai->driver->ops->shutdown(substream, codec_dai);
396 
397         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
398                 rtd->dai_link->ops->shutdown(substream);
399 
400         if (platform->driver->ops && platform->driver->ops->close)
401                 platform->driver->ops->close(substream);
402         cpu_dai->runtime = NULL;
403 
404         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
405                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
406                     rtd->dai_link->ignore_pmdown_time) {
407                         /* powered down playback stream now */
408                         snd_soc_dapm_stream_event(rtd,
409                                                   SNDRV_PCM_STREAM_PLAYBACK,
410                                                   SND_SOC_DAPM_STREAM_STOP);
411                 } else {
412                         /* start delayed pop wq here for playback streams */
413                         rtd->pop_wait = 1;
414                         schedule_delayed_work(&rtd->delayed_work,
415                                 msecs_to_jiffies(rtd->pmdown_time));
416                 }
417         } else {
418                 /* capture streams can be powered down now */
419                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
420                                           SND_SOC_DAPM_STREAM_STOP);
421         }
422 
423         mutex_unlock(&rtd->pcm_mutex);
424 
425         pm_runtime_put(platform->dev);
426         pm_runtime_put(codec_dai->dev);
427         pm_runtime_put(cpu_dai->dev);
428 
429         return 0;
430 }
431 
432 /*
433  * Called by ALSA when the PCM substream is prepared, can set format, sample
434  * rate, etc.  This function is non atomic and can be called multiple times,
435  * it can refer to the runtime info.
436  */
437 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
438 {
439         struct snd_soc_pcm_runtime *rtd = substream->private_data;
440         struct snd_soc_platform *platform = rtd->platform;
441         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
442         struct snd_soc_dai *codec_dai = rtd->codec_dai;
443         int ret = 0;
444 
445         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
446 
447         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
448                 ret = rtd->dai_link->ops->prepare(substream);
449                 if (ret < 0) {
450                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
451                                 " %d\n", ret);
452                         goto out;
453                 }
454         }
455 
456         if (platform->driver->ops && platform->driver->ops->prepare) {
457                 ret = platform->driver->ops->prepare(substream);
458                 if (ret < 0) {
459                         dev_err(platform->dev, "ASoC: platform prepare error:"
460                                 " %d\n", ret);
461                         goto out;
462                 }
463         }
464 
465         if (codec_dai->driver->ops->prepare) {
466                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
467                 if (ret < 0) {
468                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
469                                 ret);
470                         goto out;
471                 }
472         }
473 
474         if (cpu_dai->driver->ops->prepare) {
475                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
476                 if (ret < 0) {
477                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
478                                 ret);
479                         goto out;
480                 }
481         }
482 
483         /* cancel any delayed stream shutdown that is pending */
484         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
485             rtd->pop_wait) {
486                 rtd->pop_wait = 0;
487                 cancel_delayed_work(&rtd->delayed_work);
488         }
489 
490         snd_soc_dapm_stream_event(rtd, substream->stream,
491                         SND_SOC_DAPM_STREAM_START);
492 
493         snd_soc_dai_digital_mute(codec_dai, 0, substream->stream);
494 
495 out:
496         mutex_unlock(&rtd->pcm_mutex);
497         return ret;
498 }
499 
500 /*
501  * Called by ALSA when the hardware params are set by application. This
502  * function can also be called multiple times and can allocate buffers
503  * (using snd_pcm_lib_* ). It's non-atomic.
504  */
505 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
506                                 struct snd_pcm_hw_params *params)
507 {
508         struct snd_soc_pcm_runtime *rtd = substream->private_data;
509         struct snd_soc_platform *platform = rtd->platform;
510         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
511         struct snd_soc_dai *codec_dai = rtd->codec_dai;
512         int ret = 0;
513 
514         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
515 
516         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
517                 ret = rtd->dai_link->ops->hw_params(substream, params);
518                 if (ret < 0) {
519                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
520                                 " failed: %d\n", ret);
521                         goto out;
522                 }
523         }
524 
525         if (codec_dai->driver->ops->hw_params) {
526                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
527                 if (ret < 0) {
528                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
529                                 " %d\n", codec_dai->name, ret);
530                         goto codec_err;
531                 }
532         }
533 
534         if (cpu_dai->driver->ops->hw_params) {
535                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
536                 if (ret < 0) {
537                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
538                                 cpu_dai->name, ret);
539                         goto interface_err;
540                 }
541         }
542 
543         if (platform->driver->ops && platform->driver->ops->hw_params) {
544                 ret = platform->driver->ops->hw_params(substream, params);
545                 if (ret < 0) {
546                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
547                                platform->name, ret);
548                         goto platform_err;
549                 }
550         }
551 
552         /* store the rate for each DAIs */
553         cpu_dai->rate = params_rate(params);
554         codec_dai->rate = params_rate(params);
555 
556 out:
557         mutex_unlock(&rtd->pcm_mutex);
558         return ret;
559 
560 platform_err:
561         if (cpu_dai->driver->ops->hw_free)
562                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
563 
564 interface_err:
565         if (codec_dai->driver->ops->hw_free)
566                 codec_dai->driver->ops->hw_free(substream, codec_dai);
567 
568 codec_err:
569         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
570                 rtd->dai_link->ops->hw_free(substream);
571 
572         mutex_unlock(&rtd->pcm_mutex);
573         return ret;
574 }
575 
576 /*
577  * Frees resources allocated by hw_params, can be called multiple times
578  */
579 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
580 {
581         struct snd_soc_pcm_runtime *rtd = substream->private_data;
582         struct snd_soc_platform *platform = rtd->platform;
583         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
584         struct snd_soc_dai *codec_dai = rtd->codec_dai;
585         struct snd_soc_codec *codec = rtd->codec;
586 
587         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
588 
589         /* apply codec digital mute */
590         if (!codec->active)
591                 snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);
592 
593         /* free any machine hw params */
594         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
595                 rtd->dai_link->ops->hw_free(substream);
596 
597         /* free any DMA resources */
598         if (platform->driver->ops && platform->driver->ops->hw_free)
599                 platform->driver->ops->hw_free(substream);
600 
601         /* now free hw params for the DAIs  */
602         if (codec_dai->driver->ops->hw_free)
603                 codec_dai->driver->ops->hw_free(substream, codec_dai);
604 
605         if (cpu_dai->driver->ops->hw_free)
606                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
607 
608         mutex_unlock(&rtd->pcm_mutex);
609         return 0;
610 }
611 
612 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
613 {
614         struct snd_soc_pcm_runtime *rtd = substream->private_data;
615         struct snd_soc_platform *platform = rtd->platform;
616         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
617         struct snd_soc_dai *codec_dai = rtd->codec_dai;
618         int ret;
619 
620         if (codec_dai->driver->ops->trigger) {
621                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
622                 if (ret < 0)
623                         return ret;
624         }
625 
626         if (platform->driver->ops && platform->driver->ops->trigger) {
627                 ret = platform->driver->ops->trigger(substream, cmd);
628                 if (ret < 0)
629                         return ret;
630         }
631 
632         if (cpu_dai->driver->ops->trigger) {
633                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
634                 if (ret < 0)
635                         return ret;
636         }
637         return 0;
638 }
639 
640 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
641                                    int cmd)
642 {
643         struct snd_soc_pcm_runtime *rtd = substream->private_data;
644         struct snd_soc_platform *platform = rtd->platform;
645         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
646         struct snd_soc_dai *codec_dai = rtd->codec_dai;
647         int ret;
648 
649         if (codec_dai->driver->ops->bespoke_trigger) {
650                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
651                 if (ret < 0)
652                         return ret;
653         }
654 
655         if (platform->driver->bespoke_trigger) {
656                 ret = platform->driver->bespoke_trigger(substream, cmd);
657                 if (ret < 0)
658                         return ret;
659         }
660 
661         if (cpu_dai->driver->ops->bespoke_trigger) {
662                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
663                 if (ret < 0)
664                         return ret;
665         }
666         return 0;
667 }
668 /*
669  * soc level wrapper for pointer callback
670  * If cpu_dai, codec_dai, platform driver has the delay callback, than
671  * the runtime->delay will be updated accordingly.
672  */
673 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
674 {
675         struct snd_soc_pcm_runtime *rtd = substream->private_data;
676         struct snd_soc_platform *platform = rtd->platform;
677         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
678         struct snd_soc_dai *codec_dai = rtd->codec_dai;
679         struct snd_pcm_runtime *runtime = substream->runtime;
680         snd_pcm_uframes_t offset = 0;
681         snd_pcm_sframes_t delay = 0;
682 
683         if (platform->driver->ops && platform->driver->ops->pointer)
684                 offset = platform->driver->ops->pointer(substream);
685 
686         if (cpu_dai->driver->ops->delay)
687                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
688 
689         if (codec_dai->driver->ops->delay)
690                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
691 
692         if (platform->driver->delay)
693                 delay += platform->driver->delay(substream, codec_dai);
694 
695         runtime->delay = delay;
696 
697         return offset;
698 }
699 
700 /* connect a FE and BE */
701 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
702                 struct snd_soc_pcm_runtime *be, int stream)
703 {
704         struct snd_soc_dpcm *dpcm;
705 
706         /* only add new dpcms */
707         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
708                 if (dpcm->be == be && dpcm->fe == fe)
709                         return 0;
710         }
711 
712         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
713         if (!dpcm)
714                 return -ENOMEM;
715 
716         dpcm->be = be;
717         dpcm->fe = fe;
718         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
719         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
720         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
721         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
722 
723         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
724                         stream ? "capture" : "playback",  fe->dai_link->name,
725                         stream ? "<-" : "->", be->dai_link->name);
726 
727 #ifdef CONFIG_DEBUG_FS
728         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
729                         fe->debugfs_dpcm_root, &dpcm->state);
730 #endif
731         return 1;
732 }
733 
734 /* reparent a BE onto another FE */
735 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
736                         struct snd_soc_pcm_runtime *be, int stream)
737 {
738         struct snd_soc_dpcm *dpcm;
739         struct snd_pcm_substream *fe_substream, *be_substream;
740 
741         /* reparent if BE is connected to other FEs */
742         if (!be->dpcm[stream].users)
743                 return;
744 
745         be_substream = snd_soc_dpcm_get_substream(be, stream);
746 
747         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
748                 if (dpcm->fe == fe)
749                         continue;
750 
751                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
752                         stream ? "capture" : "playback",
753                         dpcm->fe->dai_link->name,
754                         stream ? "<-" : "->", dpcm->be->dai_link->name);
755 
756                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
757                 be_substream->runtime = fe_substream->runtime;
758                 break;
759         }
760 }
761 
762 /* disconnect a BE and FE */
763 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
764 {
765         struct snd_soc_dpcm *dpcm, *d;
766 
767         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
768                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
769                                 stream ? "capture" : "playback",
770                                 dpcm->be->dai_link->name);
771 
772                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
773                         continue;
774 
775                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
776                         stream ? "capture" : "playback", fe->dai_link->name,
777                         stream ? "<-" : "->", dpcm->be->dai_link->name);
778 
779                 /* BEs still alive need new FE */
780                 dpcm_be_reparent(fe, dpcm->be, stream);
781 
782 #ifdef CONFIG_DEBUG_FS
783                 debugfs_remove(dpcm->debugfs_state);
784 #endif
785                 list_del(&dpcm->list_be);
786                 list_del(&dpcm->list_fe);
787                 kfree(dpcm);
788         }
789 }
790 
791 /* get BE for DAI widget and stream */
792 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
793                 struct snd_soc_dapm_widget *widget, int stream)
794 {
795         struct snd_soc_pcm_runtime *be;
796         int i;
797 
798         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
799                 for (i = 0; i < card->num_links; i++) {
800                         be = &card->rtd[i];
801 
802                         if (!be->dai_link->no_pcm)
803                                 continue;
804 
805                         if (be->cpu_dai->playback_widget == widget ||
806                                 be->codec_dai->playback_widget == widget)
807                                 return be;
808                 }
809         } else {
810 
811                 for (i = 0; i < card->num_links; i++) {
812                         be = &card->rtd[i];
813 
814                         if (!be->dai_link->no_pcm)
815                                 continue;
816 
817                         if (be->cpu_dai->capture_widget == widget ||
818                                 be->codec_dai->capture_widget == widget)
819                                 return be;
820                 }
821         }
822 
823         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
824                 stream ? "capture" : "playback", widget->name);
825         return NULL;
826 }
827 
828 static inline struct snd_soc_dapm_widget *
829         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
830 {
831         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
832                 return rtd->cpu_dai->playback_widget;
833         else
834                 return rtd->cpu_dai->capture_widget;
835 }
836 
837 static inline struct snd_soc_dapm_widget *
838         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
839 {
840         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
841                 return rtd->codec_dai->playback_widget;
842         else
843                 return rtd->codec_dai->capture_widget;
844 }
845 
846 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
847                 struct snd_soc_dapm_widget *widget)
848 {
849         int i;
850 
851         for (i = 0; i < list->num_widgets; i++) {
852                 if (widget == list->widgets[i])
853                         return 1;
854         }
855 
856         return 0;
857 }
858 
859 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
860         int stream, struct snd_soc_dapm_widget_list **list_)
861 {
862         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
863         struct snd_soc_dapm_widget_list *list;
864         int paths;
865 
866         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
867                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
868         if (list == NULL)
869                 return -ENOMEM;
870 
871         /* get number of valid DAI paths and their widgets */
872         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
873 
874         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
875                         stream ? "capture" : "playback");
876 
877         *list_ = list;
878         return paths;
879 }
880 
881 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
882 {
883         kfree(*list);
884 }
885 
886 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
887         struct snd_soc_dapm_widget_list **list_)
888 {
889         struct snd_soc_dpcm *dpcm;
890         struct snd_soc_dapm_widget_list *list = *list_;
891         struct snd_soc_dapm_widget *widget;
892         int prune = 0;
893 
894         /* Destroy any old FE <--> BE connections */
895         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
896 
897                 /* is there a valid CPU DAI widget for this BE */
898                 widget = rtd_get_cpu_widget(dpcm->be, stream);
899 
900                 /* prune the BE if it's no longer in our active list */
901                 if (widget && widget_in_list(list, widget))
902                         continue;
903 
904                 /* is there a valid CODEC DAI widget for this BE */
905                 widget = rtd_get_codec_widget(dpcm->be, stream);
906 
907                 /* prune the BE if it's no longer in our active list */
908                 if (widget && widget_in_list(list, widget))
909                         continue;
910 
911                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
912                         stream ? "capture" : "playback",
913                         dpcm->be->dai_link->name, fe->dai_link->name);
914                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
915                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
916                 prune++;
917         }
918 
919         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
920         return prune;
921 }
922 
923 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
924         struct snd_soc_dapm_widget_list **list_)
925 {
926         struct snd_soc_card *card = fe->card;
927         struct snd_soc_dapm_widget_list *list = *list_;
928         struct snd_soc_pcm_runtime *be;
929         int i, new = 0, err;
930 
931         /* Create any new FE <--> BE connections */
932         for (i = 0; i < list->num_widgets; i++) {
933 
934                 switch (list->widgets[i]->id) {
935                 case snd_soc_dapm_dai_in:
936                 case snd_soc_dapm_dai_out:
937                         break;
938                 default:
939                         continue;
940                 }
941 
942                 /* is there a valid BE rtd for this widget */
943                 be = dpcm_get_be(card, list->widgets[i], stream);
944                 if (!be) {
945                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
946                                         list->widgets[i]->name);
947                         continue;
948                 }
949 
950                 /* make sure BE is a real BE */
951                 if (!be->dai_link->no_pcm)
952                         continue;
953 
954                 /* don't connect if FE is not running */
955                 if (!fe->dpcm[stream].runtime)
956                         continue;
957 
958                 /* newly connected FE and BE */
959                 err = dpcm_be_connect(fe, be, stream);
960                 if (err < 0) {
961                         dev_err(fe->dev, "ASoC: can't connect %s\n",
962                                 list->widgets[i]->name);
963                         break;
964                 } else if (err == 0) /* already connected */
965                         continue;
966 
967                 /* new */
968                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
969                 new++;
970         }
971 
972         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
973         return new;
974 }
975 
976 /*
977  * Find the corresponding BE DAIs that source or sink audio to this
978  * FE substream.
979  */
980 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
981         int stream, struct snd_soc_dapm_widget_list **list, int new)
982 {
983         if (new)
984                 return dpcm_add_paths(fe, stream, list);
985         else
986                 return dpcm_prune_paths(fe, stream, list);
987 }
988 
989 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
990 {
991         struct snd_soc_dpcm *dpcm;
992 
993         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
994                 dpcm->be->dpcm[stream].runtime_update =
995                                                 SND_SOC_DPCM_UPDATE_NO;
996 }
997 
998 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
999         int stream)
1000 {
1001         struct snd_soc_dpcm *dpcm;
1002 
1003         /* disable any enabled and non active backends */
1004         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1005 
1006                 struct snd_soc_pcm_runtime *be = dpcm->be;
1007                 struct snd_pcm_substream *be_substream =
1008                         snd_soc_dpcm_get_substream(be, stream);
1009 
1010                 if (be->dpcm[stream].users == 0)
1011                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1012                                 stream ? "capture" : "playback",
1013                                 be->dpcm[stream].state);
1014 
1015                 if (--be->dpcm[stream].users != 0)
1016                         continue;
1017 
1018                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1019                         continue;
1020 
1021                 soc_pcm_close(be_substream);
1022                 be_substream->runtime = NULL;
1023                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1024         }
1025 }
1026 
1027 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1028 {
1029         struct snd_soc_dpcm *dpcm;
1030         int err, count = 0;
1031 
1032         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1033         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1034 
1035                 struct snd_soc_pcm_runtime *be = dpcm->be;
1036                 struct snd_pcm_substream *be_substream =
1037                         snd_soc_dpcm_get_substream(be, stream);
1038 
1039                 /* is this op for this BE ? */
1040                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1041                         continue;
1042 
1043                 /* first time the dpcm is open ? */
1044                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1045                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1046                                 stream ? "capture" : "playback",
1047                                 be->dpcm[stream].state);
1048 
1049                 if (be->dpcm[stream].users++ != 0)
1050                         continue;
1051 
1052                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1053                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1054                         continue;
1055 
1056                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1057 
1058                 be_substream->runtime = be->dpcm[stream].runtime;
1059                 err = soc_pcm_open(be_substream);
1060                 if (err < 0) {
1061                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1062                         be->dpcm[stream].users--;
1063                         if (be->dpcm[stream].users < 0)
1064                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1065                                         stream ? "capture" : "playback",
1066                                         be->dpcm[stream].state);
1067 
1068                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1069                         goto unwind;
1070                 }
1071 
1072                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1073                 count++;
1074         }
1075 
1076         return count;
1077 
1078 unwind:
1079         /* disable any enabled and non active backends */
1080         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1081                 struct snd_soc_pcm_runtime *be = dpcm->be;
1082                 struct snd_pcm_substream *be_substream =
1083                         snd_soc_dpcm_get_substream(be, stream);
1084 
1085                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1086                         continue;
1087 
1088                 if (be->dpcm[stream].users == 0)
1089                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1090                                 stream ? "capture" : "playback",
1091                                 be->dpcm[stream].state);
1092 
1093                 if (--be->dpcm[stream].users != 0)
1094                         continue;
1095 
1096                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1097                         continue;
1098 
1099                 soc_pcm_close(be_substream);
1100                 be_substream->runtime = NULL;
1101                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1102         }
1103 
1104         return err;
1105 }
1106 
1107 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1108 {
1109         struct snd_pcm_runtime *runtime = substream->runtime;
1110         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1111         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1112         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1113 
1114         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1115                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1116                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1117                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1118                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1119                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1120                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1121         } else {
1122                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1123                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1124                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1125                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1126                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1127                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1128         }
1129 }
1130 
1131 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1132 {
1133         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1134         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1135         int stream = fe_substream->stream, ret = 0;
1136 
1137         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1138 
1139         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1140         if (ret < 0) {
1141                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1142                 goto be_err;
1143         }
1144 
1145         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1146 
1147         /* start the DAI frontend */
1148         ret = soc_pcm_open(fe_substream);
1149         if (ret < 0) {
1150                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1151                 goto unwind;
1152         }
1153 
1154         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1155 
1156         dpcm_set_fe_runtime(fe_substream);
1157         snd_pcm_limit_hw_rates(runtime);
1158 
1159         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1160         return 0;
1161 
1162 unwind:
1163         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1164 be_err:
1165         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1166         return ret;
1167 }
1168 
1169 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1170 {
1171         struct snd_soc_dpcm *dpcm;
1172 
1173         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1174         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1175 
1176                 struct snd_soc_pcm_runtime *be = dpcm->be;
1177                 struct snd_pcm_substream *be_substream =
1178                         snd_soc_dpcm_get_substream(be, stream);
1179 
1180                 /* is this op for this BE ? */
1181                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1182                         continue;
1183 
1184                 if (be->dpcm[stream].users == 0)
1185                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1186                                 stream ? "capture" : "playback",
1187                                 be->dpcm[stream].state);
1188 
1189                 if (--be->dpcm[stream].users != 0)
1190                         continue;
1191 
1192                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1193                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1194                         continue;
1195 
1196                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1197                         dpcm->fe->dai_link->name);
1198 
1199                 soc_pcm_close(be_substream);
1200                 be_substream->runtime = NULL;
1201 
1202                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1203         }
1204         return 0;
1205 }
1206 
1207 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1208 {
1209         struct snd_soc_pcm_runtime *fe = substream->private_data;
1210         int stream = substream->stream;
1211 
1212         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1213 
1214         /* shutdown the BEs */
1215         dpcm_be_dai_shutdown(fe, substream->stream);
1216 
1217         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1218 
1219         /* now shutdown the frontend */
1220         soc_pcm_close(substream);
1221 
1222         /* run the stream event for each BE */
1223         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1224 
1225         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1226         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1227         return 0;
1228 }
1229 
1230 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1231 {
1232         struct snd_soc_dpcm *dpcm;
1233 
1234         /* only hw_params backends that are either sinks or sources
1235          * to this frontend DAI */
1236         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1237 
1238                 struct snd_soc_pcm_runtime *be = dpcm->be;
1239                 struct snd_pcm_substream *be_substream =
1240                         snd_soc_dpcm_get_substream(be, stream);
1241 
1242                 /* is this op for this BE ? */
1243                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1244                         continue;
1245 
1246                 /* only free hw when no longer used - check all FEs */
1247                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1248                                 continue;
1249 
1250                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1251                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1252                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1253                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1254                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1255                         continue;
1256 
1257                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1258                         dpcm->fe->dai_link->name);
1259 
1260                 soc_pcm_hw_free(be_substream);
1261 
1262                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1263         }
1264 
1265         return 0;
1266 }
1267 
1268 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1269 {
1270         struct snd_soc_pcm_runtime *fe = substream->private_data;
1271         int err, stream = substream->stream;
1272 
1273         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1274         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1275 
1276         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1277 
1278         /* call hw_free on the frontend */
1279         err = soc_pcm_hw_free(substream);
1280         if (err < 0)
1281                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1282                         fe->dai_link->name);
1283 
1284         /* only hw_params backends that are either sinks or sources
1285          * to this frontend DAI */
1286         err = dpcm_be_dai_hw_free(fe, stream);
1287 
1288         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1289         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1290 
1291         mutex_unlock(&fe->card->mutex);
1292         return 0;
1293 }
1294 
1295 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1296 {
1297         struct snd_soc_dpcm *dpcm;
1298         int ret;
1299 
1300         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1301 
1302                 struct snd_soc_pcm_runtime *be = dpcm->be;
1303                 struct snd_pcm_substream *be_substream =
1304                         snd_soc_dpcm_get_substream(be, stream);
1305 
1306                 /* is this op for this BE ? */
1307                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1308                         continue;
1309 
1310                 /* only allow hw_params() if no connected FEs are running */
1311                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1312                         continue;
1313 
1314                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1315                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1316                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1317                         continue;
1318 
1319                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1320                         dpcm->fe->dai_link->name);
1321 
1322                 /* copy params for each dpcm */
1323                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1324                                 sizeof(struct snd_pcm_hw_params));
1325 
1326                 /* perform any hw_params fixups */
1327                 if (be->dai_link->be_hw_params_fixup) {
1328                         ret = be->dai_link->be_hw_params_fixup(be,
1329                                         &dpcm->hw_params);
1330                         if (ret < 0) {
1331                                 dev_err(be->dev,
1332                                         "ASoC: hw_params BE fixup failed %d\n",
1333                                         ret);
1334                                 goto unwind;
1335                         }
1336                 }
1337 
1338                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1339                 if (ret < 0) {
1340                         dev_err(dpcm->be->dev,
1341                                 "ASoC: hw_params BE failed %d\n", ret);
1342                         goto unwind;
1343                 }
1344 
1345                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1346         }
1347         return 0;
1348 
1349 unwind:
1350         /* disable any enabled and non active backends */
1351         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1352                 struct snd_soc_pcm_runtime *be = dpcm->be;
1353                 struct snd_pcm_substream *be_substream =
1354                         snd_soc_dpcm_get_substream(be, stream);
1355 
1356                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1357                         continue;
1358 
1359                 /* only allow hw_free() if no connected FEs are running */
1360                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1361                         continue;
1362 
1363                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1364                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1365                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1366                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1367                         continue;
1368 
1369                 soc_pcm_hw_free(be_substream);
1370         }
1371 
1372         return ret;
1373 }
1374 
1375 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1376                                  struct snd_pcm_hw_params *params)
1377 {
1378         struct snd_soc_pcm_runtime *fe = substream->private_data;
1379         int ret, stream = substream->stream;
1380 
1381         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1382         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1383 
1384         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1385                         sizeof(struct snd_pcm_hw_params));
1386         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1387         if (ret < 0) {
1388                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1389                 goto out;
1390         }
1391 
1392         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1393                         fe->dai_link->name, params_rate(params),
1394                         params_channels(params), params_format(params));
1395 
1396         /* call hw_params on the frontend */
1397         ret = soc_pcm_hw_params(substream, params);
1398         if (ret < 0) {
1399                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1400                 dpcm_be_dai_hw_free(fe, stream);
1401          } else
1402                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1403 
1404 out:
1405         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1406         mutex_unlock(&fe->card->mutex);
1407         return ret;
1408 }
1409 
1410 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1411                 struct snd_pcm_substream *substream, int cmd)
1412 {
1413         int ret;
1414 
1415         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1416                         dpcm->fe->dai_link->name, cmd);
1417 
1418         ret = soc_pcm_trigger(substream, cmd);
1419         if (ret < 0)
1420                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1421 
1422         return ret;
1423 }
1424 
1425 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1426                                int cmd)
1427 {
1428         struct snd_soc_dpcm *dpcm;
1429         int ret = 0;
1430 
1431         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1432 
1433                 struct snd_soc_pcm_runtime *be = dpcm->be;
1434                 struct snd_pcm_substream *be_substream =
1435                         snd_soc_dpcm_get_substream(be, stream);
1436 
1437                 /* is this op for this BE ? */
1438                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1439                         continue;
1440 
1441                 switch (cmd) {
1442                 case SNDRV_PCM_TRIGGER_START:
1443                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1444                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1445                                 continue;
1446 
1447                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1448                         if (ret)
1449                                 return ret;
1450 
1451                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1452                         break;
1453                 case SNDRV_PCM_TRIGGER_RESUME:
1454                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1455                                 continue;
1456 
1457                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1458                         if (ret)
1459                                 return ret;
1460 
1461                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1462                         break;
1463                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1464                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1465                                 continue;
1466 
1467                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1468                         if (ret)
1469                                 return ret;
1470 
1471                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1472                         break;
1473                 case SNDRV_PCM_TRIGGER_STOP:
1474                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1475                                 continue;
1476 
1477                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1478                                 continue;
1479 
1480                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1481                         if (ret)
1482                                 return ret;
1483 
1484                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1485                         break;
1486                 case SNDRV_PCM_TRIGGER_SUSPEND:
1487                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1488                                 continue;
1489 
1490                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1491                                 continue;
1492 
1493                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1494                         if (ret)
1495                                 return ret;
1496 
1497                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1498                         break;
1499                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1500                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1501                                 continue;
1502 
1503                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1504                                 continue;
1505 
1506                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1507                         if (ret)
1508                                 return ret;
1509 
1510                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1511                         break;
1512                 }
1513         }
1514 
1515         return ret;
1516 }
1517 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1518 
1519 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1520 {
1521         struct snd_soc_pcm_runtime *fe = substream->private_data;
1522         int stream = substream->stream, ret;
1523         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1524 
1525         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1526 
1527         switch (trigger) {
1528         case SND_SOC_DPCM_TRIGGER_PRE:
1529                 /* call trigger on the frontend before the backend. */
1530 
1531                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1532                                 fe->dai_link->name, cmd);
1533 
1534                 ret = soc_pcm_trigger(substream, cmd);
1535                 if (ret < 0) {
1536                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1537                         goto out;
1538                 }
1539 
1540                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1541                 break;
1542         case SND_SOC_DPCM_TRIGGER_POST:
1543                 /* call trigger on the frontend after the backend. */
1544 
1545                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1546                 if (ret < 0) {
1547                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1548                         goto out;
1549                 }
1550 
1551                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1552                                 fe->dai_link->name, cmd);
1553 
1554                 ret = soc_pcm_trigger(substream, cmd);
1555                 break;
1556         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1557                 /* bespoke trigger() - handles both FE and BEs */
1558 
1559                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1560                                 fe->dai_link->name, cmd);
1561 
1562                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1563                 if (ret < 0) {
1564                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1565                         goto out;
1566                 }
1567                 break;
1568         default:
1569                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1570                                 fe->dai_link->name);
1571                 ret = -EINVAL;
1572                 goto out;
1573         }
1574 
1575         switch (cmd) {
1576         case SNDRV_PCM_TRIGGER_START:
1577         case SNDRV_PCM_TRIGGER_RESUME:
1578         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1579                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1580                 break;
1581         case SNDRV_PCM_TRIGGER_STOP:
1582         case SNDRV_PCM_TRIGGER_SUSPEND:
1583         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1584                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1585                 break;
1586         }
1587 
1588 out:
1589         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1590         return ret;
1591 }
1592 
1593 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1594 {
1595         struct snd_soc_dpcm *dpcm;
1596         int ret = 0;
1597 
1598         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1599 
1600                 struct snd_soc_pcm_runtime *be = dpcm->be;
1601                 struct snd_pcm_substream *be_substream =
1602                         snd_soc_dpcm_get_substream(be, stream);
1603 
1604                 /* is this op for this BE ? */
1605                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1606                         continue;
1607 
1608                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1609                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1610                         continue;
1611 
1612                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1613                         dpcm->fe->dai_link->name);
1614 
1615                 ret = soc_pcm_prepare(be_substream);
1616                 if (ret < 0) {
1617                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1618                                 ret);
1619                         break;
1620                 }
1621 
1622                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1623         }
1624         return ret;
1625 }
1626 
1627 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1628 {
1629         struct snd_soc_pcm_runtime *fe = substream->private_data;
1630         int stream = substream->stream, ret = 0;
1631 
1632         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1633 
1634         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1635 
1636         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1637 
1638         /* there is no point preparing this FE if there are no BEs */
1639         if (list_empty(&fe->dpcm[stream].be_clients)) {
1640                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1641                                 fe->dai_link->name);
1642                 ret = -EINVAL;
1643                 goto out;
1644         }
1645 
1646         ret = dpcm_be_dai_prepare(fe, substream->stream);
1647         if (ret < 0)
1648                 goto out;
1649 
1650         /* call prepare on the frontend */
1651         ret = soc_pcm_prepare(substream);
1652         if (ret < 0) {
1653                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1654                         fe->dai_link->name);
1655                 goto out;
1656         }
1657 
1658         /* run the stream event for each BE */
1659         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1660         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1661 
1662 out:
1663         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1664         mutex_unlock(&fe->card->mutex);
1665 
1666         return ret;
1667 }
1668 
1669 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1670                      unsigned int cmd, void *arg)
1671 {
1672         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1673         struct snd_soc_platform *platform = rtd->platform;
1674 
1675         if (platform->driver->ops->ioctl)
1676                 return platform->driver->ops->ioctl(substream, cmd, arg);
1677         return snd_pcm_lib_ioctl(substream, cmd, arg);
1678 }
1679 
1680 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1681 {
1682         struct snd_pcm_substream *substream =
1683                 snd_soc_dpcm_get_substream(fe, stream);
1684         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1685         int err;
1686 
1687         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1688                         stream ? "capture" : "playback", fe->dai_link->name);
1689 
1690         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1691                 /* call bespoke trigger - FE takes care of all BE triggers */
1692                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1693                                 fe->dai_link->name);
1694 
1695                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1696                 if (err < 0)
1697                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1698         } else {
1699                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1700                         fe->dai_link->name);
1701 
1702                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1703                 if (err < 0)
1704                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1705         }
1706 
1707         err = dpcm_be_dai_hw_free(fe, stream);
1708         if (err < 0)
1709                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1710 
1711         err = dpcm_be_dai_shutdown(fe, stream);
1712         if (err < 0)
1713                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1714 
1715         /* run the stream event for each BE */
1716         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1717 
1718         return 0;
1719 }
1720 
1721 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1722 {
1723         struct snd_pcm_substream *substream =
1724                 snd_soc_dpcm_get_substream(fe, stream);
1725         struct snd_soc_dpcm *dpcm;
1726         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1727         int ret;
1728 
1729         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1730                         stream ? "capture" : "playback", fe->dai_link->name);
1731 
1732         /* Only start the BE if the FE is ready */
1733         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1734                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1735                 return -EINVAL;
1736 
1737         /* startup must always be called for new BEs */
1738         ret = dpcm_be_dai_startup(fe, stream);
1739         if (ret < 0)
1740                 goto disconnect;
1741 
1742         /* keep going if FE state is > open */
1743         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1744                 return 0;
1745 
1746         ret = dpcm_be_dai_hw_params(fe, stream);
1747         if (ret < 0)
1748                 goto close;
1749 
1750         /* keep going if FE state is > hw_params */
1751         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1752                 return 0;
1753 
1754 
1755         ret = dpcm_be_dai_prepare(fe, stream);
1756         if (ret < 0)
1757                 goto hw_free;
1758 
1759         /* run the stream event for each BE */
1760         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1761 
1762         /* keep going if FE state is > prepare */
1763         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1764                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1765                 return 0;
1766 
1767         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1768                 /* call trigger on the frontend - FE takes care of all BE triggers */
1769                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1770                                 fe->dai_link->name);
1771 
1772                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1773                 if (ret < 0) {
1774                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1775                         goto hw_free;
1776                 }
1777         } else {
1778                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1779                         fe->dai_link->name);
1780 
1781                 ret = dpcm_be_dai_trigger(fe, stream,
1782                                         SNDRV_PCM_TRIGGER_START);
1783                 if (ret < 0) {
1784                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1785                         goto hw_free;
1786                 }
1787         }
1788 
1789         return 0;
1790 
1791 hw_free:
1792         dpcm_be_dai_hw_free(fe, stream);
1793 close:
1794         dpcm_be_dai_shutdown(fe, stream);
1795 disconnect:
1796         /* disconnect any non started BEs */
1797         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1798                 struct snd_soc_pcm_runtime *be = dpcm->be;
1799                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1800                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1801         }
1802 
1803         return ret;
1804 }
1805 
1806 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1807 {
1808         int ret;
1809 
1810         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1811         ret = dpcm_run_update_startup(fe, stream);
1812         if (ret < 0)
1813                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1814         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1815 
1816         return ret;
1817 }
1818 
1819 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1820 {
1821         int ret;
1822 
1823         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1824         ret = dpcm_run_update_shutdown(fe, stream);
1825         if (ret < 0)
1826                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1827         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1828 
1829         return ret;
1830 }
1831 
1832 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1833  * any DAI links.
1834  */
1835 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1836 {
1837         struct snd_soc_card *card;
1838         int i, old, new, paths;
1839 
1840         if (widget->codec)
1841                 card = widget->codec->card;
1842         else if (widget->platform)
1843                 card = widget->platform->card;
1844         else
1845                 return -EINVAL;
1846 
1847         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1848         for (i = 0; i < card->num_rtd; i++) {
1849                 struct snd_soc_dapm_widget_list *list;
1850                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1851 
1852                 /* make sure link is FE */
1853                 if (!fe->dai_link->dynamic)
1854                         continue;
1855 
1856                 /* only check active links */
1857                 if (!fe->cpu_dai->active)
1858                         continue;
1859 
1860                 /* DAPM sync will call this to update DSP paths */
1861                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1862                         fe->dai_link->name);
1863 
1864                 /* skip if FE doesn't have playback capability */
1865                 if (!fe->cpu_dai->driver->playback.channels_min)
1866                         goto capture;
1867 
1868                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1869                 if (paths < 0) {
1870                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1871                                         fe->dai_link->name,  "playback");
1872                         mutex_unlock(&card->mutex);
1873                         return paths;
1874                 }
1875 
1876                 /* update any new playback paths */
1877                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1878                 if (new) {
1879                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1880                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1881                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1882                 }
1883 
1884                 /* update any old playback paths */
1885                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1886                 if (old) {
1887                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1888                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1889                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1890                 }
1891 
1892 capture:
1893                 /* skip if FE doesn't have capture capability */
1894                 if (!fe->cpu_dai->driver->capture.channels_min)
1895                         continue;
1896 
1897                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1898                 if (paths < 0) {
1899                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1900                                         fe->dai_link->name,  "capture");
1901                         mutex_unlock(&card->mutex);
1902                         return paths;
1903                 }
1904 
1905                 /* update any new capture paths */
1906                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1907                 if (new) {
1908                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1910                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1911                 }
1912 
1913                 /* update any old capture paths */
1914                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1915                 if (old) {
1916                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1917                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1918                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1919                 }
1920 
1921                 dpcm_path_put(&list);
1922         }
1923 
1924         mutex_unlock(&card->mutex);
1925         return 0;
1926 }
1927 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1928 {
1929         struct snd_soc_dpcm *dpcm;
1930         struct list_head *clients =
1931                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1932 
1933         list_for_each_entry(dpcm, clients, list_be) {
1934 
1935                 struct snd_soc_pcm_runtime *be = dpcm->be;
1936                 struct snd_soc_dai *dai = be->codec_dai;
1937                 struct snd_soc_dai_driver *drv = dai->driver;
1938 
1939                 if (be->dai_link->ignore_suspend)
1940                         continue;
1941 
1942                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1943 
1944                 if (drv->ops->digital_mute && dai->playback_active)
1945                                 drv->ops->digital_mute(dai, mute);
1946         }
1947 
1948         return 0;
1949 }
1950 
1951 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1952 {
1953         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1954         struct snd_soc_dpcm *dpcm;
1955         struct snd_soc_dapm_widget_list *list;
1956         int ret;
1957         int stream = fe_substream->stream;
1958 
1959         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1960         fe->dpcm[stream].runtime = fe_substream->runtime;
1961 
1962         if (dpcm_path_get(fe, stream, &list) <= 0) {
1963                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1964                         fe->dai_link->name, stream ? "capture" : "playback");
1965         }
1966 
1967         /* calculate valid and active FE <-> BE dpcms */
1968         dpcm_process_paths(fe, stream, &list, 1);
1969 
1970         ret = dpcm_fe_dai_startup(fe_substream);
1971         if (ret < 0) {
1972                 /* clean up all links */
1973                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1974                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1975 
1976                 dpcm_be_disconnect(fe, stream);
1977                 fe->dpcm[stream].runtime = NULL;
1978         }
1979 
1980         dpcm_clear_pending_state(fe, stream);
1981         dpcm_path_put(&list);
1982         mutex_unlock(&fe->card->mutex);
1983         return ret;
1984 }
1985 
1986 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1987 {
1988         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1989         struct snd_soc_dpcm *dpcm;
1990         int stream = fe_substream->stream, ret;
1991 
1992         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1993         ret = dpcm_fe_dai_shutdown(fe_substream);
1994 
1995         /* mark FE's links ready to prune */
1996         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1997                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1998 
1999         dpcm_be_disconnect(fe, stream);
2000 
2001         fe->dpcm[stream].runtime = NULL;
2002         mutex_unlock(&fe->card->mutex);
2003         return ret;
2004 }
2005 
2006 /* create a new pcm */
2007 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2008 {
2009         struct snd_soc_platform *platform = rtd->platform;
2010         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2011         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2012         struct snd_pcm *pcm;
2013         char new_name[64];
2014         int ret = 0, playback = 0, capture = 0;
2015 
2016         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2017                 if (cpu_dai->driver->playback.channels_min)
2018                         playback = 1;
2019                 if (cpu_dai->driver->capture.channels_min)
2020                         capture = 1;
2021         } else {
2022                 if (codec_dai->driver->playback.channels_min &&
2023                     cpu_dai->driver->playback.channels_min)
2024                         playback = 1;
2025                 if (codec_dai->driver->capture.channels_min &&
2026                     cpu_dai->driver->capture.channels_min)
2027                         capture = 1;
2028         }
2029 
2030         /* create the PCM */
2031         if (rtd->dai_link->no_pcm) {
2032                 snprintf(new_name, sizeof(new_name), "(%s)",
2033                         rtd->dai_link->stream_name);
2034 
2035                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2036                                 playback, capture, &pcm);
2037         } else {
2038                 if (rtd->dai_link->dynamic)
2039                         snprintf(new_name, sizeof(new_name), "%s (*)",
2040                                 rtd->dai_link->stream_name);
2041                 else
2042                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2043                                 rtd->dai_link->stream_name, codec_dai->name, num);
2044 
2045                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2046                         capture, &pcm);
2047         }
2048         if (ret < 0) {
2049                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2050                         rtd->dai_link->name);
2051                 return ret;
2052         }
2053         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2054 
2055         /* DAPM dai link stream work */
2056         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2057 
2058         rtd->pcm = pcm;
2059         pcm->private_data = rtd;
2060 
2061         if (rtd->dai_link->no_pcm) {
2062                 if (playback)
2063                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2064                 if (capture)
2065                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2066                 goto out;
2067         }
2068 
2069         /* ASoC PCM operations */
2070         if (rtd->dai_link->dynamic) {
2071                 rtd->ops.open           = dpcm_fe_dai_open;
2072                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2073                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2074                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2075                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2076                 rtd->ops.close          = dpcm_fe_dai_close;
2077                 rtd->ops.pointer        = soc_pcm_pointer;
2078                 rtd->ops.ioctl          = soc_pcm_ioctl;
2079         } else {
2080                 rtd->ops.open           = soc_pcm_open;
2081                 rtd->ops.hw_params      = soc_pcm_hw_params;
2082                 rtd->ops.prepare        = soc_pcm_prepare;
2083                 rtd->ops.trigger        = soc_pcm_trigger;
2084                 rtd->ops.hw_free        = soc_pcm_hw_free;
2085                 rtd->ops.close          = soc_pcm_close;
2086                 rtd->ops.pointer        = soc_pcm_pointer;
2087                 rtd->ops.ioctl          = soc_pcm_ioctl;
2088         }
2089 
2090         if (platform->driver->ops) {
2091                 rtd->ops.ack            = platform->driver->ops->ack;
2092                 rtd->ops.copy           = platform->driver->ops->copy;
2093                 rtd->ops.silence        = platform->driver->ops->silence;
2094                 rtd->ops.page           = platform->driver->ops->page;
2095                 rtd->ops.mmap           = platform->driver->ops->mmap;
2096         }
2097 
2098         if (playback)
2099                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2100 
2101         if (capture)
2102                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2103 
2104         if (platform->driver->pcm_new) {
2105                 ret = platform->driver->pcm_new(rtd);
2106                 if (ret < 0) {
2107                         dev_err(platform->dev,
2108                                 "ASoC: pcm constructor failed: %d\n",
2109                                 ret);
2110                         return ret;
2111                 }
2112         }
2113 
2114         pcm->private_free = platform->driver->pcm_free;
2115 out:
2116         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2117                 cpu_dai->name);
2118         return ret;
2119 }
2120 
2121 /* is the current PCM operation for this FE ? */
2122 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2123 {
2124         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2125                 return 1;
2126         return 0;
2127 }
2128 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2129 
2130 /* is the current PCM operation for this BE ? */
2131 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2132                 struct snd_soc_pcm_runtime *be, int stream)
2133 {
2134         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2135            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2136                   be->dpcm[stream].runtime_update))
2137                 return 1;
2138         return 0;
2139 }
2140 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2141 
2142 /* get the substream for this BE */
2143 struct snd_pcm_substream *
2144         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2145 {
2146         return be->pcm->streams[stream].substream;
2147 }
2148 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2149 
2150 /* get the BE runtime state */
2151 enum snd_soc_dpcm_state
2152         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2153 {
2154         return be->dpcm[stream].state;
2155 }
2156 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2157 
2158 /* set the BE runtime state */
2159 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2160                 int stream, enum snd_soc_dpcm_state state)
2161 {
2162         be->dpcm[stream].state = state;
2163 }
2164 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2165 
2166 /*
2167  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2168  * are not running, paused or suspended for the specified stream direction.
2169  */
2170 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2171                 struct snd_soc_pcm_runtime *be, int stream)
2172 {
2173         struct snd_soc_dpcm *dpcm;
2174         int state;
2175 
2176         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2177 
2178                 if (dpcm->fe == fe)
2179                         continue;
2180 
2181                 state = dpcm->fe->dpcm[stream].state;
2182                 if (state == SND_SOC_DPCM_STATE_START ||
2183                         state == SND_SOC_DPCM_STATE_PAUSED ||
2184                         state == SND_SOC_DPCM_STATE_SUSPEND)
2185                         return 0;
2186         }
2187 
2188         /* it's safe to free/stop this BE DAI */
2189         return 1;
2190 }
2191 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2192 
2193 /*
2194  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2195  * running, paused or suspended for the specified stream direction.
2196  */
2197 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2198                 struct snd_soc_pcm_runtime *be, int stream)
2199 {
2200         struct snd_soc_dpcm *dpcm;
2201         int state;
2202 
2203         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2204 
2205                 if (dpcm->fe == fe)
2206                         continue;
2207 
2208                 state = dpcm->fe->dpcm[stream].state;
2209                 if (state == SND_SOC_DPCM_STATE_START ||
2210                         state == SND_SOC_DPCM_STATE_PAUSED ||
2211                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2212                         state == SND_SOC_DPCM_STATE_PREPARE)
2213                         return 0;
2214         }
2215 
2216         /* it's safe to change hw_params */
2217         return 1;
2218 }
2219 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2220 
2221 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2222                 int cmd, struct snd_soc_platform *platform)
2223 {
2224         if (platform->driver->ops->trigger)
2225                 return platform->driver->ops->trigger(substream, cmd);
2226         return 0;
2227 }
2228 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2229 
2230 #ifdef CONFIG_DEBUG_FS
2231 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2232 {
2233         switch (state) {
2234         case SND_SOC_DPCM_STATE_NEW:
2235                 return "new";
2236         case SND_SOC_DPCM_STATE_OPEN:
2237                 return "open";
2238         case SND_SOC_DPCM_STATE_HW_PARAMS:
2239                 return "hw_params";
2240         case SND_SOC_DPCM_STATE_PREPARE:
2241                 return "prepare";
2242         case SND_SOC_DPCM_STATE_START:
2243                 return "start";
2244         case SND_SOC_DPCM_STATE_STOP:
2245                 return "stop";
2246         case SND_SOC_DPCM_STATE_SUSPEND:
2247                 return "suspend";
2248         case SND_SOC_DPCM_STATE_PAUSED:
2249                 return "paused";
2250         case SND_SOC_DPCM_STATE_HW_FREE:
2251                 return "hw_free";
2252         case SND_SOC_DPCM_STATE_CLOSE:
2253                 return "close";
2254         }
2255 
2256         return "unknown";
2257 }
2258 
2259 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2260                                 int stream, char *buf, size_t size)
2261 {
2262         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2263         struct snd_soc_dpcm *dpcm;
2264         ssize_t offset = 0;
2265 
2266         /* FE state */
2267         offset += snprintf(buf + offset, size - offset,
2268                         "[%s - %s]\n", fe->dai_link->name,
2269                         stream ? "Capture" : "Playback");
2270 
2271         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2272                         dpcm_state_string(fe->dpcm[stream].state));
2273 
2274         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2275             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2276                 offset += snprintf(buf + offset, size - offset,
2277                                 "Hardware Params: "
2278                                 "Format = %s, Channels = %d, Rate = %d\n",
2279                                 snd_pcm_format_name(params_format(params)),
2280                                 params_channels(params),
2281                                 params_rate(params));
2282 
2283         /* BEs state */
2284         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2285 
2286         if (list_empty(&fe->dpcm[stream].be_clients)) {
2287                 offset += snprintf(buf + offset, size - offset,
2288                                 " No active DSP links\n");
2289                 goto out;
2290         }
2291 
2292         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2293                 struct snd_soc_pcm_runtime *be = dpcm->be;
2294                 params = &dpcm->hw_params;
2295 
2296                 offset += snprintf(buf + offset, size - offset,
2297                                 "- %s\n", be->dai_link->name);
2298 
2299                 offset += snprintf(buf + offset, size - offset,
2300                                 "   State: %s\n",
2301                                 dpcm_state_string(be->dpcm[stream].state));
2302 
2303                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2304                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2305                         offset += snprintf(buf + offset, size - offset,
2306                                 "   Hardware Params: "
2307                                 "Format = %s, Channels = %d, Rate = %d\n",
2308                                 snd_pcm_format_name(params_format(params)),
2309                                 params_channels(params),
2310                                 params_rate(params));
2311         }
2312 
2313 out:
2314         return offset;
2315 }
2316 
2317 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2318                                 size_t count, loff_t *ppos)
2319 {
2320         struct snd_soc_pcm_runtime *fe = file->private_data;
2321         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2322         char *buf;
2323 
2324         buf = kmalloc(out_count, GFP_KERNEL);
2325         if (!buf)
2326                 return -ENOMEM;
2327 
2328         if (fe->cpu_dai->driver->playback.channels_min)
2329                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2330                                         buf + offset, out_count - offset);
2331 
2332         if (fe->cpu_dai->driver->capture.channels_min)
2333                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2334                                         buf + offset, out_count - offset);
2335 
2336         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2337 
2338         kfree(buf);
2339         return ret;
2340 }
2341 
2342 static const struct file_operations dpcm_state_fops = {
2343         .open = simple_open,
2344         .read = dpcm_state_read_file,
2345         .llseek = default_llseek,
2346 };
2347 
2348 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2349 {
2350         if (!rtd->dai_link)
2351                 return 0;
2352 
2353         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2354                         rtd->card->debugfs_card_root);
2355         if (!rtd->debugfs_dpcm_root) {
2356                 dev_dbg(rtd->dev,
2357                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2358                          rtd->dai_link->name);
2359                 return -EINVAL;
2360         }
2361 
2362         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2363                                                 rtd->debugfs_dpcm_root,
2364                                                 rtd, &dpcm_state_fops);
2365 
2366         return 0;
2367 }
2368 #endif
2369 

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