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ASoC: pcm: allow backend hardware to be freed in pause state
[~shefty/rdma-dev.git] / sound / soc / soc-pcm.c
1 /*
2  * soc-pcm.c  --  ALSA SoC PCM
3  *
4  * Copyright 2005 Wolfson Microelectronics PLC.
5  * Copyright 2005 Openedhand Ltd.
6  * Copyright (C) 2010 Slimlogic Ltd.
7  * Copyright (C) 2010 Texas Instruments Inc.
8  *
9  * Authors: Liam Girdwood <lrg@ti.com>
10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>       
11  *
12  *  This program is free software; you can redistribute  it and/or modify it
13  *  under  the terms of  the GNU General  Public License as published by the
14  *  Free Software Foundation;  either version 2 of the  License, or (at your
15  *  option) any later version.
16  *
17  */
18
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/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 /* DPCM stream event, send event to FE and all active BEs. */
37 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
38         int event)
39 {
40         struct snd_soc_dpcm *dpcm;
41
42         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
43
44                 struct snd_soc_pcm_runtime *be = dpcm->be;
45
46                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
47                                 be->dai_link->name, event, dir);
48
49                 snd_soc_dapm_stream_event(be, dir, event);
50         }
51
52         snd_soc_dapm_stream_event(fe, dir, event);
53
54         return 0;
55 }
56
57 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
58                                         struct snd_soc_dai *soc_dai)
59 {
60         struct snd_soc_pcm_runtime *rtd = substream->private_data;
61         int ret;
62
63         if (!soc_dai->driver->symmetric_rates &&
64             !rtd->dai_link->symmetric_rates)
65                 return 0;
66
67         /* This can happen if multiple streams are starting simultaneously -
68          * the second can need to get its constraints before the first has
69          * picked a rate.  Complain and allow the application to carry on.
70          */
71         if (!soc_dai->rate) {
72                 dev_warn(soc_dai->dev,
73                          "ASoC: Not enforcing symmetric_rates due to race\n");
74                 return 0;
75         }
76
77         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n", soc_dai->rate);
78
79         ret = snd_pcm_hw_constraint_minmax(substream->runtime,
80                                            SNDRV_PCM_HW_PARAM_RATE,
81                                            soc_dai->rate, soc_dai->rate);
82         if (ret < 0) {
83                 dev_err(soc_dai->dev,
84                         "ASoC: Unable to apply rate symmetry constraint: %d\n",
85                         ret);
86                 return ret;
87         }
88
89         return 0;
90 }
91
92 /*
93  * List of sample sizes that might go over the bus for parameter
94  * application.  There ought to be a wildcard sample size for things
95  * like the DAC/ADC resolution to use but there isn't right now.
96  */
97 static int sample_sizes[] = {
98         24, 32,
99 };
100
101 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
102                               struct snd_soc_dai *dai)
103 {
104         int ret, i, bits;
105
106         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
107                 bits = dai->driver->playback.sig_bits;
108         else
109                 bits = dai->driver->capture.sig_bits;
110
111         if (!bits)
112                 return;
113
114         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
115                 if (bits >= sample_sizes[i])
116                         continue;
117
118                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
119                                                    sample_sizes[i], bits);
120                 if (ret != 0)
121                         dev_warn(dai->dev,
122                                  "ASoC: Failed to set MSB %d/%d: %d\n",
123                                  bits, sample_sizes[i], ret);
124         }
125 }
126
127 /*
128  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
129  * then initialized and any private data can be allocated. This also calls
130  * startup for the cpu DAI, platform, machine and codec DAI.
131  */
132 static int soc_pcm_open(struct snd_pcm_substream *substream)
133 {
134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
135         struct snd_pcm_runtime *runtime = substream->runtime;
136         struct snd_soc_platform *platform = rtd->platform;
137         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
138         struct snd_soc_dai *codec_dai = rtd->codec_dai;
139         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
140         struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
141         int ret = 0;
142
143         pm_runtime_get_sync(cpu_dai->dev);
144         pm_runtime_get_sync(codec_dai->dev);
145         pm_runtime_get_sync(platform->dev);
146
147         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
148
149         /* startup the audio subsystem */
150         if (cpu_dai->driver->ops->startup) {
151                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
152                 if (ret < 0) {
153                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
154                                 " %s: %d\n", cpu_dai->name, ret);
155                         goto out;
156                 }
157         }
158
159         if (platform->driver->ops && platform->driver->ops->open) {
160                 ret = platform->driver->ops->open(substream);
161                 if (ret < 0) {
162                         dev_err(platform->dev, "ASoC: can't open platform"
163                                 " %s: %d\n", platform->name, ret);
164                         goto platform_err;
165                 }
166         }
167
168         if (codec_dai->driver->ops->startup) {
169                 ret = codec_dai->driver->ops->startup(substream, codec_dai);
170                 if (ret < 0) {
171                         dev_err(codec_dai->dev, "ASoC: can't open codec"
172                                 " %s: %d\n", codec_dai->name, ret);
173                         goto codec_dai_err;
174                 }
175         }
176
177         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
178                 ret = rtd->dai_link->ops->startup(substream);
179                 if (ret < 0) {
180                         pr_err("ASoC: %s startup failed: %d\n",
181                                rtd->dai_link->name, ret);
182                         goto machine_err;
183                 }
184         }
185
186         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
187         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
188                 goto dynamic;
189
190         /* Check that the codec and cpu DAIs are compatible */
191         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
192                 runtime->hw.rate_min =
193                         max(codec_dai_drv->playback.rate_min,
194                             cpu_dai_drv->playback.rate_min);
195                 runtime->hw.rate_max =
196                         min(codec_dai_drv->playback.rate_max,
197                             cpu_dai_drv->playback.rate_max);
198                 runtime->hw.channels_min =
199                         max(codec_dai_drv->playback.channels_min,
200                                 cpu_dai_drv->playback.channels_min);
201                 runtime->hw.channels_max =
202                         min(codec_dai_drv->playback.channels_max,
203                                 cpu_dai_drv->playback.channels_max);
204                 runtime->hw.formats =
205                         codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
206                 runtime->hw.rates =
207                         codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
208                 if (codec_dai_drv->playback.rates
209                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
210                         runtime->hw.rates |= cpu_dai_drv->playback.rates;
211                 if (cpu_dai_drv->playback.rates
212                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
213                         runtime->hw.rates |= codec_dai_drv->playback.rates;
214         } else {
215                 runtime->hw.rate_min =
216                         max(codec_dai_drv->capture.rate_min,
217                             cpu_dai_drv->capture.rate_min);
218                 runtime->hw.rate_max =
219                         min(codec_dai_drv->capture.rate_max,
220                             cpu_dai_drv->capture.rate_max);
221                 runtime->hw.channels_min =
222                         max(codec_dai_drv->capture.channels_min,
223                                 cpu_dai_drv->capture.channels_min);
224                 runtime->hw.channels_max =
225                         min(codec_dai_drv->capture.channels_max,
226                                 cpu_dai_drv->capture.channels_max);
227                 runtime->hw.formats =
228                         codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
229                 runtime->hw.rates =
230                         codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
231                 if (codec_dai_drv->capture.rates
232                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
233                         runtime->hw.rates |= cpu_dai_drv->capture.rates;
234                 if (cpu_dai_drv->capture.rates
235                            & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
236                         runtime->hw.rates |= codec_dai_drv->capture.rates;
237         }
238
239         ret = -EINVAL;
240         snd_pcm_limit_hw_rates(runtime);
241         if (!runtime->hw.rates) {
242                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
243                         codec_dai->name, cpu_dai->name);
244                 goto config_err;
245         }
246         if (!runtime->hw.formats) {
247                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
248                         codec_dai->name, cpu_dai->name);
249                 goto config_err;
250         }
251         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
252             runtime->hw.channels_min > runtime->hw.channels_max) {
253                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
254                                 codec_dai->name, cpu_dai->name);
255                 goto config_err;
256         }
257
258         soc_pcm_apply_msb(substream, codec_dai);
259         soc_pcm_apply_msb(substream, cpu_dai);
260
261         /* Symmetry only applies if we've already got an active stream. */
262         if (cpu_dai->active) {
263                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
264                 if (ret != 0)
265                         goto config_err;
266         }
267
268         if (codec_dai->active) {
269                 ret = soc_pcm_apply_symmetry(substream, codec_dai);
270                 if (ret != 0)
271                         goto config_err;
272         }
273
274         pr_debug("ASoC: %s <-> %s info:\n",
275                         codec_dai->name, cpu_dai->name);
276         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
277         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
278                  runtime->hw.channels_max);
279         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
280                  runtime->hw.rate_max);
281
282 dynamic:
283         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
284                 cpu_dai->playback_active++;
285                 codec_dai->playback_active++;
286         } else {
287                 cpu_dai->capture_active++;
288                 codec_dai->capture_active++;
289         }
290         cpu_dai->active++;
291         codec_dai->active++;
292         rtd->codec->active++;
293         mutex_unlock(&rtd->pcm_mutex);
294         return 0;
295
296 config_err:
297         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
298                 rtd->dai_link->ops->shutdown(substream);
299
300 machine_err:
301         if (codec_dai->driver->ops->shutdown)
302                 codec_dai->driver->ops->shutdown(substream, codec_dai);
303
304 codec_dai_err:
305         if (platform->driver->ops && platform->driver->ops->close)
306                 platform->driver->ops->close(substream);
307
308 platform_err:
309         if (cpu_dai->driver->ops->shutdown)
310                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
311 out:
312         mutex_unlock(&rtd->pcm_mutex);
313
314         pm_runtime_put(platform->dev);
315         pm_runtime_put(codec_dai->dev);
316         pm_runtime_put(cpu_dai->dev);
317
318         return ret;
319 }
320
321 /*
322  * Power down the audio subsystem pmdown_time msecs after close is called.
323  * This is to ensure there are no pops or clicks in between any music tracks
324  * due to DAPM power cycling.
325  */
326 static void close_delayed_work(struct work_struct *work)
327 {
328         struct snd_soc_pcm_runtime *rtd =
329                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
330         struct snd_soc_dai *codec_dai = rtd->codec_dai;
331
332         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
333
334         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
335                  codec_dai->driver->playback.stream_name,
336                  codec_dai->playback_active ? "active" : "inactive",
337                  rtd->pop_wait ? "yes" : "no");
338
339         /* are we waiting on this codec DAI stream */
340         if (rtd->pop_wait == 1) {
341                 rtd->pop_wait = 0;
342                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
343                                           SND_SOC_DAPM_STREAM_STOP);
344         }
345
346         mutex_unlock(&rtd->pcm_mutex);
347 }
348
349 /*
350  * Called by ALSA when a PCM substream is closed. Private data can be
351  * freed here. The cpu DAI, codec DAI, machine and platform are also
352  * shutdown.
353  */
354 static int soc_pcm_close(struct snd_pcm_substream *substream)
355 {
356         struct snd_soc_pcm_runtime *rtd = substream->private_data;
357         struct snd_soc_platform *platform = rtd->platform;
358         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
359         struct snd_soc_dai *codec_dai = rtd->codec_dai;
360         struct snd_soc_codec *codec = rtd->codec;
361
362         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
363
364         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
365                 cpu_dai->playback_active--;
366                 codec_dai->playback_active--;
367         } else {
368                 cpu_dai->capture_active--;
369                 codec_dai->capture_active--;
370         }
371
372         cpu_dai->active--;
373         codec_dai->active--;
374         codec->active--;
375
376         /* clear the corresponding DAIs rate when inactive */
377         if (!cpu_dai->active)
378                 cpu_dai->rate = 0;
379
380         if (!codec_dai->active)
381                 codec_dai->rate = 0;
382
383         /* Muting the DAC suppresses artifacts caused during digital
384          * shutdown, for example from stopping clocks.
385          */
386         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
387                 snd_soc_dai_digital_mute(codec_dai, 1);
388
389         if (cpu_dai->driver->ops->shutdown)
390                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
391
392         if (codec_dai->driver->ops->shutdown)
393                 codec_dai->driver->ops->shutdown(substream, codec_dai);
394
395         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
396                 rtd->dai_link->ops->shutdown(substream);
397
398         if (platform->driver->ops && platform->driver->ops->close)
399                 platform->driver->ops->close(substream);
400         cpu_dai->runtime = NULL;
401
402         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
403                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
404                     rtd->dai_link->ignore_pmdown_time) {
405                         /* powered down playback stream now */
406                         snd_soc_dapm_stream_event(rtd,
407                                                   SNDRV_PCM_STREAM_PLAYBACK,
408                                                   SND_SOC_DAPM_STREAM_STOP);
409                 } else {
410                         /* start delayed pop wq here for playback streams */
411                         rtd->pop_wait = 1;
412                         schedule_delayed_work(&rtd->delayed_work,
413                                 msecs_to_jiffies(rtd->pmdown_time));
414                 }
415         } else {
416                 /* capture streams can be powered down now */
417                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
418                                           SND_SOC_DAPM_STREAM_STOP);
419         }
420
421         mutex_unlock(&rtd->pcm_mutex);
422
423         pm_runtime_put(platform->dev);
424         pm_runtime_put(codec_dai->dev);
425         pm_runtime_put(cpu_dai->dev);
426
427         return 0;
428 }
429
430 /*
431  * Called by ALSA when the PCM substream is prepared, can set format, sample
432  * rate, etc.  This function is non atomic and can be called multiple times,
433  * it can refer to the runtime info.
434  */
435 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
436 {
437         struct snd_soc_pcm_runtime *rtd = substream->private_data;
438         struct snd_soc_platform *platform = rtd->platform;
439         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
440         struct snd_soc_dai *codec_dai = rtd->codec_dai;
441         int ret = 0;
442
443         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
444
445         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
446                 ret = rtd->dai_link->ops->prepare(substream);
447                 if (ret < 0) {
448                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
449                                 " %d\n", ret);
450                         goto out;
451                 }
452         }
453
454         if (platform->driver->ops && platform->driver->ops->prepare) {
455                 ret = platform->driver->ops->prepare(substream);
456                 if (ret < 0) {
457                         dev_err(platform->dev, "ASoC: platform prepare error:"
458                                 " %d\n", ret);
459                         goto out;
460                 }
461         }
462
463         if (codec_dai->driver->ops->prepare) {
464                 ret = codec_dai->driver->ops->prepare(substream, codec_dai);
465                 if (ret < 0) {
466                         dev_err(codec_dai->dev, "ASoC: DAI prepare error: %d\n",
467                                 ret);
468                         goto out;
469                 }
470         }
471
472         if (cpu_dai->driver->ops->prepare) {
473                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
474                 if (ret < 0) {
475                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
476                                 ret);
477                         goto out;
478                 }
479         }
480
481         /* cancel any delayed stream shutdown that is pending */
482         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
483             rtd->pop_wait) {
484                 rtd->pop_wait = 0;
485                 cancel_delayed_work(&rtd->delayed_work);
486         }
487
488         snd_soc_dapm_stream_event(rtd, substream->stream,
489                         SND_SOC_DAPM_STREAM_START);
490
491         snd_soc_dai_digital_mute(codec_dai, 0);
492
493 out:
494         mutex_unlock(&rtd->pcm_mutex);
495         return ret;
496 }
497
498 /*
499  * Called by ALSA when the hardware params are set by application. This
500  * function can also be called multiple times and can allocate buffers
501  * (using snd_pcm_lib_* ). It's non-atomic.
502  */
503 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
504                                 struct snd_pcm_hw_params *params)
505 {
506         struct snd_soc_pcm_runtime *rtd = substream->private_data;
507         struct snd_soc_platform *platform = rtd->platform;
508         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
509         struct snd_soc_dai *codec_dai = rtd->codec_dai;
510         int ret = 0;
511
512         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
513
514         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
515                 ret = rtd->dai_link->ops->hw_params(substream, params);
516                 if (ret < 0) {
517                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
518                                 " failed: %d\n", ret);
519                         goto out;
520                 }
521         }
522
523         if (codec_dai->driver->ops->hw_params) {
524                 ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
525                 if (ret < 0) {
526                         dev_err(codec_dai->dev, "ASoC: can't set %s hw params:"
527                                 " %d\n", codec_dai->name, ret);
528                         goto codec_err;
529                 }
530         }
531
532         if (cpu_dai->driver->ops->hw_params) {
533                 ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
534                 if (ret < 0) {
535                         dev_err(cpu_dai->dev, "ASoC: %s hw params failed: %d\n",
536                                 cpu_dai->name, ret);
537                         goto interface_err;
538                 }
539         }
540
541         if (platform->driver->ops && platform->driver->ops->hw_params) {
542                 ret = platform->driver->ops->hw_params(substream, params);
543                 if (ret < 0) {
544                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
545                                platform->name, ret);
546                         goto platform_err;
547                 }
548         }
549
550         /* store the rate for each DAIs */
551         cpu_dai->rate = params_rate(params);
552         codec_dai->rate = params_rate(params);
553
554 out:
555         mutex_unlock(&rtd->pcm_mutex);
556         return ret;
557
558 platform_err:
559         if (cpu_dai->driver->ops->hw_free)
560                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
561
562 interface_err:
563         if (codec_dai->driver->ops->hw_free)
564                 codec_dai->driver->ops->hw_free(substream, codec_dai);
565
566 codec_err:
567         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
568                 rtd->dai_link->ops->hw_free(substream);
569
570         mutex_unlock(&rtd->pcm_mutex);
571         return ret;
572 }
573
574 /*
575  * Frees resources allocated by hw_params, can be called multiple times
576  */
577 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
578 {
579         struct snd_soc_pcm_runtime *rtd = substream->private_data;
580         struct snd_soc_platform *platform = rtd->platform;
581         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
582         struct snd_soc_dai *codec_dai = rtd->codec_dai;
583         struct snd_soc_codec *codec = rtd->codec;
584
585         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
586
587         /* apply codec digital mute */
588         if (!codec->active)
589                 snd_soc_dai_digital_mute(codec_dai, 1);
590
591         /* free any machine hw params */
592         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
593                 rtd->dai_link->ops->hw_free(substream);
594
595         /* free any DMA resources */
596         if (platform->driver->ops && platform->driver->ops->hw_free)
597                 platform->driver->ops->hw_free(substream);
598
599         /* now free hw params for the DAIs  */
600         if (codec_dai->driver->ops->hw_free)
601                 codec_dai->driver->ops->hw_free(substream, codec_dai);
602
603         if (cpu_dai->driver->ops->hw_free)
604                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
605
606         mutex_unlock(&rtd->pcm_mutex);
607         return 0;
608 }
609
610 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
611 {
612         struct snd_soc_pcm_runtime *rtd = substream->private_data;
613         struct snd_soc_platform *platform = rtd->platform;
614         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
615         struct snd_soc_dai *codec_dai = rtd->codec_dai;
616         int ret;
617
618         if (codec_dai->driver->ops->trigger) {
619                 ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
620                 if (ret < 0)
621                         return ret;
622         }
623
624         if (platform->driver->ops && platform->driver->ops->trigger) {
625                 ret = platform->driver->ops->trigger(substream, cmd);
626                 if (ret < 0)
627                         return ret;
628         }
629
630         if (cpu_dai->driver->ops->trigger) {
631                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
632                 if (ret < 0)
633                         return ret;
634         }
635         return 0;
636 }
637
638 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
639                                    int cmd)
640 {
641         struct snd_soc_pcm_runtime *rtd = substream->private_data;
642         struct snd_soc_platform *platform = rtd->platform;
643         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
644         struct snd_soc_dai *codec_dai = rtd->codec_dai;
645         int ret;
646
647         if (codec_dai->driver->ops->bespoke_trigger) {
648                 ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
649                 if (ret < 0)
650                         return ret;
651         }
652
653         if (platform->driver->bespoke_trigger) {
654                 ret = platform->driver->bespoke_trigger(substream, cmd);
655                 if (ret < 0)
656                         return ret;
657         }
658
659         if (cpu_dai->driver->ops->bespoke_trigger) {
660                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
661                 if (ret < 0)
662                         return ret;
663         }
664         return 0;
665 }
666 /*
667  * soc level wrapper for pointer callback
668  * If cpu_dai, codec_dai, platform driver has the delay callback, than
669  * the runtime->delay will be updated accordingly.
670  */
671 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
672 {
673         struct snd_soc_pcm_runtime *rtd = substream->private_data;
674         struct snd_soc_platform *platform = rtd->platform;
675         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
676         struct snd_soc_dai *codec_dai = rtd->codec_dai;
677         struct snd_pcm_runtime *runtime = substream->runtime;
678         snd_pcm_uframes_t offset = 0;
679         snd_pcm_sframes_t delay = 0;
680
681         if (platform->driver->ops && platform->driver->ops->pointer)
682                 offset = platform->driver->ops->pointer(substream);
683
684         if (cpu_dai->driver->ops->delay)
685                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
686
687         if (codec_dai->driver->ops->delay)
688                 delay += codec_dai->driver->ops->delay(substream, codec_dai);
689
690         if (platform->driver->delay)
691                 delay += platform->driver->delay(substream, codec_dai);
692
693         runtime->delay = delay;
694
695         return offset;
696 }
697
698 /* connect a FE and BE */
699 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
700                 struct snd_soc_pcm_runtime *be, int stream)
701 {
702         struct snd_soc_dpcm *dpcm;
703
704         /* only add new dpcms */
705         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
706                 if (dpcm->be == be && dpcm->fe == fe)
707                         return 0;
708         }
709
710         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
711         if (!dpcm)
712                 return -ENOMEM;
713
714         dpcm->be = be;
715         dpcm->fe = fe;
716         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
717         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
718         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
719         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
720
721         dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
722                         stream ? "capture" : "playback",  fe->dai_link->name,
723                         stream ? "<-" : "->", be->dai_link->name);
724
725 #ifdef CONFIG_DEBUG_FS
726         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
727                         fe->debugfs_dpcm_root, &dpcm->state);
728 #endif
729         return 1;
730 }
731
732 /* reparent a BE onto another FE */
733 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
734                         struct snd_soc_pcm_runtime *be, int stream)
735 {
736         struct snd_soc_dpcm *dpcm;
737         struct snd_pcm_substream *fe_substream, *be_substream;
738
739         /* reparent if BE is connected to other FEs */
740         if (!be->dpcm[stream].users)
741                 return;
742
743         be_substream = snd_soc_dpcm_get_substream(be, stream);
744
745         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
746                 if (dpcm->fe == fe)
747                         continue;
748
749                 dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
750                         stream ? "capture" : "playback",
751                         dpcm->fe->dai_link->name,
752                         stream ? "<-" : "->", dpcm->be->dai_link->name);
753
754                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
755                 be_substream->runtime = fe_substream->runtime;
756                 break;
757         }
758 }
759
760 /* disconnect a BE and FE */
761 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
762 {
763         struct snd_soc_dpcm *dpcm, *d;
764
765         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
766                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
767                                 stream ? "capture" : "playback",
768                                 dpcm->be->dai_link->name);
769
770                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
771                         continue;
772
773                 dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
774                         stream ? "capture" : "playback", fe->dai_link->name,
775                         stream ? "<-" : "->", dpcm->be->dai_link->name);
776
777                 /* BEs still alive need new FE */
778                 dpcm_be_reparent(fe, dpcm->be, stream);
779
780 #ifdef CONFIG_DEBUG_FS
781                 debugfs_remove(dpcm->debugfs_state);
782 #endif
783                 list_del(&dpcm->list_be);
784                 list_del(&dpcm->list_fe);
785                 kfree(dpcm);
786         }
787 }
788
789 /* get BE for DAI widget and stream */
790 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
791                 struct snd_soc_dapm_widget *widget, int stream)
792 {
793         struct snd_soc_pcm_runtime *be;
794         int i;
795
796         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
797                 for (i = 0; i < card->num_links; i++) {
798                         be = &card->rtd[i];
799
800                         if (!be->dai_link->no_pcm)
801                                 continue;
802
803                         if (be->cpu_dai->playback_widget == widget ||
804                                 be->codec_dai->playback_widget == widget)
805                                 return be;
806                 }
807         } else {
808
809                 for (i = 0; i < card->num_links; i++) {
810                         be = &card->rtd[i];
811
812                         if (!be->dai_link->no_pcm)
813                                 continue;
814
815                         if (be->cpu_dai->capture_widget == widget ||
816                                 be->codec_dai->capture_widget == widget)
817                                 return be;
818                 }
819         }
820
821         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
822                 stream ? "capture" : "playback", widget->name);
823         return NULL;
824 }
825
826 static inline struct snd_soc_dapm_widget *
827         rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
828 {
829         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
830                 return rtd->cpu_dai->playback_widget;
831         else
832                 return rtd->cpu_dai->capture_widget;
833 }
834
835 static inline struct snd_soc_dapm_widget *
836         rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
837 {
838         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
839                 return rtd->codec_dai->playback_widget;
840         else
841                 return rtd->codec_dai->capture_widget;
842 }
843
844 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
845                 struct snd_soc_dapm_widget *widget)
846 {
847         int i;
848
849         for (i = 0; i < list->num_widgets; i++) {
850                 if (widget == list->widgets[i])
851                         return 1;
852         }
853
854         return 0;
855 }
856
857 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
858         int stream, struct snd_soc_dapm_widget_list **list_)
859 {
860         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
861         struct snd_soc_dapm_widget_list *list;
862         int paths;
863
864         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
865                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
866         if (list == NULL)
867                 return -ENOMEM;
868
869         /* get number of valid DAI paths and their widgets */
870         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
871
872         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
873                         stream ? "capture" : "playback");
874
875         *list_ = list;
876         return paths;
877 }
878
879 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
880 {
881         kfree(*list);
882 }
883
884 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
885         struct snd_soc_dapm_widget_list **list_)
886 {
887         struct snd_soc_dpcm *dpcm;
888         struct snd_soc_dapm_widget_list *list = *list_;
889         struct snd_soc_dapm_widget *widget;
890         int prune = 0;
891
892         /* Destroy any old FE <--> BE connections */
893         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
894
895                 /* is there a valid CPU DAI widget for this BE */
896                 widget = rtd_get_cpu_widget(dpcm->be, stream);
897
898                 /* prune the BE if it's no longer in our active list */
899                 if (widget && widget_in_list(list, widget))
900                         continue;
901
902                 /* is there a valid CODEC DAI widget for this BE */
903                 widget = rtd_get_codec_widget(dpcm->be, stream);
904
905                 /* prune the BE if it's no longer in our active list */
906                 if (widget && widget_in_list(list, widget))
907                         continue;
908
909                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
910                         stream ? "capture" : "playback",
911                         dpcm->be->dai_link->name, fe->dai_link->name);
912                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
913                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
914                 prune++;
915         }
916
917         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
918         return prune;
919 }
920
921 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
922         struct snd_soc_dapm_widget_list **list_)
923 {
924         struct snd_soc_card *card = fe->card;
925         struct snd_soc_dapm_widget_list *list = *list_;
926         struct snd_soc_pcm_runtime *be;
927         int i, new = 0, err;
928
929         /* Create any new FE <--> BE connections */
930         for (i = 0; i < list->num_widgets; i++) {
931
932                 if (list->widgets[i]->id != snd_soc_dapm_dai)
933                         continue;
934
935                 /* is there a valid BE rtd for this widget */
936                 be = dpcm_get_be(card, list->widgets[i], stream);
937                 if (!be) {
938                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
939                                         list->widgets[i]->name);
940                         continue;
941                 }
942
943                 /* make sure BE is a real BE */
944                 if (!be->dai_link->no_pcm)
945                         continue;
946
947                 /* don't connect if FE is not running */
948                 if (!fe->dpcm[stream].runtime)
949                         continue;
950
951                 /* newly connected FE and BE */
952                 err = dpcm_be_connect(fe, be, stream);
953                 if (err < 0) {
954                         dev_err(fe->dev, "ASoC: can't connect %s\n",
955                                 list->widgets[i]->name);
956                         break;
957                 } else if (err == 0) /* already connected */
958                         continue;
959
960                 /* new */
961                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
962                 new++;
963         }
964
965         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
966         return new;
967 }
968
969 /*
970  * Find the corresponding BE DAIs that source or sink audio to this
971  * FE substream.
972  */
973 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
974         int stream, struct snd_soc_dapm_widget_list **list, int new)
975 {
976         if (new)
977                 return dpcm_add_paths(fe, stream, list);
978         else
979                 return dpcm_prune_paths(fe, stream, list);
980 }
981
982 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
983 {
984         struct snd_soc_dpcm *dpcm;
985
986         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
987                 dpcm->be->dpcm[stream].runtime_update =
988                                                 SND_SOC_DPCM_UPDATE_NO;
989 }
990
991 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
992         int stream)
993 {
994         struct snd_soc_dpcm *dpcm;
995
996         /* disable any enabled and non active backends */
997         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
998
999                 struct snd_soc_pcm_runtime *be = dpcm->be;
1000                 struct snd_pcm_substream *be_substream =
1001                         snd_soc_dpcm_get_substream(be, stream);
1002
1003                 if (be->dpcm[stream].users == 0)
1004                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1005                                 stream ? "capture" : "playback",
1006                                 be->dpcm[stream].state);
1007
1008                 if (--be->dpcm[stream].users != 0)
1009                         continue;
1010
1011                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1012                         continue;
1013
1014                 soc_pcm_close(be_substream);
1015                 be_substream->runtime = NULL;
1016                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1017         }
1018 }
1019
1020 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1021 {
1022         struct snd_soc_dpcm *dpcm;
1023         int err, count = 0;
1024
1025         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1026         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1027
1028                 struct snd_soc_pcm_runtime *be = dpcm->be;
1029                 struct snd_pcm_substream *be_substream =
1030                         snd_soc_dpcm_get_substream(be, stream);
1031
1032                 /* is this op for this BE ? */
1033                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1034                         continue;
1035
1036                 /* first time the dpcm is open ? */
1037                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1038                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1039                                 stream ? "capture" : "playback",
1040                                 be->dpcm[stream].state);
1041
1042                 if (be->dpcm[stream].users++ != 0)
1043                         continue;
1044
1045                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1046                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1047                         continue;
1048
1049                 dev_dbg(be->dev, "ASoC: open BE %s\n", be->dai_link->name);
1050
1051                 be_substream->runtime = be->dpcm[stream].runtime;
1052                 err = soc_pcm_open(be_substream);
1053                 if (err < 0) {
1054                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1055                         be->dpcm[stream].users--;
1056                         if (be->dpcm[stream].users < 0)
1057                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1058                                         stream ? "capture" : "playback",
1059                                         be->dpcm[stream].state);
1060
1061                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1062                         goto unwind;
1063                 }
1064
1065                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1066                 count++;
1067         }
1068
1069         return count;
1070
1071 unwind:
1072         /* disable any enabled and non active backends */
1073         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1074                 struct snd_soc_pcm_runtime *be = dpcm->be;
1075                 struct snd_pcm_substream *be_substream =
1076                         snd_soc_dpcm_get_substream(be, stream);
1077
1078                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1079                         continue;
1080
1081                 if (be->dpcm[stream].users == 0)
1082                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1083                                 stream ? "capture" : "playback",
1084                                 be->dpcm[stream].state);
1085
1086                 if (--be->dpcm[stream].users != 0)
1087                         continue;
1088
1089                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1090                         continue;
1091
1092                 soc_pcm_close(be_substream);
1093                 be_substream->runtime = NULL;
1094                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1095         }
1096
1097         return err;
1098 }
1099
1100 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1101 {
1102         struct snd_pcm_runtime *runtime = substream->runtime;
1103         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1104         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1105         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1106
1107         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1108                 runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1109                 runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1110                 runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1111                 runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1112                 runtime->hw.formats &= cpu_dai_drv->playback.formats;
1113                 runtime->hw.rates = cpu_dai_drv->playback.rates;
1114         } else {
1115                 runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1116                 runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1117                 runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1118                 runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1119                 runtime->hw.formats &= cpu_dai_drv->capture.formats;
1120                 runtime->hw.rates = cpu_dai_drv->capture.rates;
1121         }
1122 }
1123
1124 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1125 {
1126         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1127         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1128         int stream = fe_substream->stream, ret = 0;
1129
1130         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1131
1132         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1133         if (ret < 0) {
1134                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1135                 goto be_err;
1136         }
1137
1138         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1139
1140         /* start the DAI frontend */
1141         ret = soc_pcm_open(fe_substream);
1142         if (ret < 0) {
1143                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1144                 goto unwind;
1145         }
1146
1147         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1148
1149         dpcm_set_fe_runtime(fe_substream);
1150         snd_pcm_limit_hw_rates(runtime);
1151
1152         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1153         return 0;
1154
1155 unwind:
1156         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1157 be_err:
1158         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1159         return ret;
1160 }
1161
1162 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1163 {
1164         struct snd_soc_dpcm *dpcm;
1165
1166         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1167         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1168
1169                 struct snd_soc_pcm_runtime *be = dpcm->be;
1170                 struct snd_pcm_substream *be_substream =
1171                         snd_soc_dpcm_get_substream(be, stream);
1172
1173                 /* is this op for this BE ? */
1174                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1175                         continue;
1176
1177                 if (be->dpcm[stream].users == 0)
1178                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1179                                 stream ? "capture" : "playback",
1180                                 be->dpcm[stream].state);
1181
1182                 if (--be->dpcm[stream].users != 0)
1183                         continue;
1184
1185                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1186                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1187                         continue;
1188
1189                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1190                         dpcm->fe->dai_link->name);
1191
1192                 soc_pcm_close(be_substream);
1193                 be_substream->runtime = NULL;
1194
1195                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1196         }
1197         return 0;
1198 }
1199
1200 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1201 {
1202         struct snd_soc_pcm_runtime *fe = substream->private_data;
1203         int stream = substream->stream;
1204
1205         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1206
1207         /* shutdown the BEs */
1208         dpcm_be_dai_shutdown(fe, substream->stream);
1209
1210         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1211
1212         /* now shutdown the frontend */
1213         soc_pcm_close(substream);
1214
1215         /* run the stream event for each BE */
1216         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1217
1218         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1219         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1220         return 0;
1221 }
1222
1223 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1224 {
1225         struct snd_soc_dpcm *dpcm;
1226
1227         /* only hw_params backends that are either sinks or sources
1228          * to this frontend DAI */
1229         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1230
1231                 struct snd_soc_pcm_runtime *be = dpcm->be;
1232                 struct snd_pcm_substream *be_substream =
1233                         snd_soc_dpcm_get_substream(be, stream);
1234
1235                 /* is this op for this BE ? */
1236                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1237                         continue;
1238
1239                 /* only free hw when no longer used - check all FEs */
1240                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1241                                 continue;
1242
1243                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1244                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1245                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1246                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1247                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1248                         continue;
1249
1250                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1251                         dpcm->fe->dai_link->name);
1252
1253                 soc_pcm_hw_free(be_substream);
1254
1255                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1256         }
1257
1258         return 0;
1259 }
1260
1261 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1262 {
1263         struct snd_soc_pcm_runtime *fe = substream->private_data;
1264         int err, stream = substream->stream;
1265
1266         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1267         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1268
1269         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1270
1271         /* call hw_free on the frontend */
1272         err = soc_pcm_hw_free(substream);
1273         if (err < 0)
1274                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1275                         fe->dai_link->name);
1276
1277         /* only hw_params backends that are either sinks or sources
1278          * to this frontend DAI */
1279         err = dpcm_be_dai_hw_free(fe, stream);
1280
1281         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1282         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1283
1284         mutex_unlock(&fe->card->mutex);
1285         return 0;
1286 }
1287
1288 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1289 {
1290         struct snd_soc_dpcm *dpcm;
1291         int ret;
1292
1293         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1294
1295                 struct snd_soc_pcm_runtime *be = dpcm->be;
1296                 struct snd_pcm_substream *be_substream =
1297                         snd_soc_dpcm_get_substream(be, stream);
1298
1299                 /* is this op for this BE ? */
1300                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1301                         continue;
1302
1303                 /* only allow hw_params() if no connected FEs are running */
1304                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1305                         continue;
1306
1307                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1308                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1309                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1310                         continue;
1311
1312                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1313                         dpcm->fe->dai_link->name);
1314
1315                 /* copy params for each dpcm */
1316                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1317                                 sizeof(struct snd_pcm_hw_params));
1318
1319                 /* perform any hw_params fixups */
1320                 if (be->dai_link->be_hw_params_fixup) {
1321                         ret = be->dai_link->be_hw_params_fixup(be,
1322                                         &dpcm->hw_params);
1323                         if (ret < 0) {
1324                                 dev_err(be->dev,
1325                                         "ASoC: hw_params BE fixup failed %d\n",
1326                                         ret);
1327                                 goto unwind;
1328                         }
1329                 }
1330
1331                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1332                 if (ret < 0) {
1333                         dev_err(dpcm->be->dev,
1334                                 "ASoC: hw_params BE failed %d\n", ret);
1335                         goto unwind;
1336                 }
1337
1338                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1339         }
1340         return 0;
1341
1342 unwind:
1343         /* disable any enabled and non active backends */
1344         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1345                 struct snd_soc_pcm_runtime *be = dpcm->be;
1346                 struct snd_pcm_substream *be_substream =
1347                         snd_soc_dpcm_get_substream(be, stream);
1348
1349                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1350                         continue;
1351
1352                 /* only allow hw_free() if no connected FEs are running */
1353                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1354                         continue;
1355
1356                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1357                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1358                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1359                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1360                         continue;
1361
1362                 soc_pcm_hw_free(be_substream);
1363         }
1364
1365         return ret;
1366 }
1367
1368 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1369                                  struct snd_pcm_hw_params *params)
1370 {
1371         struct snd_soc_pcm_runtime *fe = substream->private_data;
1372         int ret, stream = substream->stream;
1373
1374         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1375         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1376
1377         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1378                         sizeof(struct snd_pcm_hw_params));
1379         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1380         if (ret < 0) {
1381                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1382                 goto out;
1383         }
1384
1385         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1386                         fe->dai_link->name, params_rate(params),
1387                         params_channels(params), params_format(params));
1388
1389         /* call hw_params on the frontend */
1390         ret = soc_pcm_hw_params(substream, params);
1391         if (ret < 0) {
1392                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1393                 dpcm_be_dai_hw_free(fe, stream);
1394          } else
1395                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1396
1397 out:
1398         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1399         mutex_unlock(&fe->card->mutex);
1400         return ret;
1401 }
1402
1403 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1404                 struct snd_pcm_substream *substream, int cmd)
1405 {
1406         int ret;
1407
1408         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1409                         dpcm->fe->dai_link->name, cmd);
1410
1411         ret = soc_pcm_trigger(substream, cmd);
1412         if (ret < 0)
1413                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1414
1415         return ret;
1416 }
1417
1418 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1419                                int cmd)
1420 {
1421         struct snd_soc_dpcm *dpcm;
1422         int ret = 0;
1423
1424         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1425
1426                 struct snd_soc_pcm_runtime *be = dpcm->be;
1427                 struct snd_pcm_substream *be_substream =
1428                         snd_soc_dpcm_get_substream(be, stream);
1429
1430                 /* is this op for this BE ? */
1431                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1432                         continue;
1433
1434                 switch (cmd) {
1435                 case SNDRV_PCM_TRIGGER_START:
1436                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1437                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1438                                 continue;
1439
1440                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1441                         if (ret)
1442                                 return ret;
1443
1444                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1445                         break;
1446                 case SNDRV_PCM_TRIGGER_RESUME:
1447                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1448                                 continue;
1449
1450                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1451                         if (ret)
1452                                 return ret;
1453
1454                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1455                         break;
1456                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1457                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1458                                 continue;
1459
1460                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1461                         if (ret)
1462                                 return ret;
1463
1464                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1465                         break;
1466                 case SNDRV_PCM_TRIGGER_STOP:
1467                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1468                                 continue;
1469
1470                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1471                                 continue;
1472
1473                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1474                         if (ret)
1475                                 return ret;
1476
1477                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1478                         break;
1479                 case SNDRV_PCM_TRIGGER_SUSPEND:
1480                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1481                                 continue;
1482
1483                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1484                                 continue;
1485
1486                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1487                         if (ret)
1488                                 return ret;
1489
1490                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1491                         break;
1492                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1493                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1494                                 continue;
1495
1496                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1497                                 continue;
1498
1499                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1500                         if (ret)
1501                                 return ret;
1502
1503                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1504                         break;
1505                 }
1506         }
1507
1508         return ret;
1509 }
1510 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1511
1512 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1513 {
1514         struct snd_soc_pcm_runtime *fe = substream->private_data;
1515         int stream = substream->stream, ret;
1516         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1517
1518         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1519
1520         switch (trigger) {
1521         case SND_SOC_DPCM_TRIGGER_PRE:
1522                 /* call trigger on the frontend before the backend. */
1523
1524                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1525                                 fe->dai_link->name, cmd);
1526
1527                 ret = soc_pcm_trigger(substream, cmd);
1528                 if (ret < 0) {
1529                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1530                         goto out;
1531                 }
1532
1533                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1534                 break;
1535         case SND_SOC_DPCM_TRIGGER_POST:
1536                 /* call trigger on the frontend after the backend. */
1537
1538                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1539                 if (ret < 0) {
1540                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1541                         goto out;
1542                 }
1543
1544                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1545                                 fe->dai_link->name, cmd);
1546
1547                 ret = soc_pcm_trigger(substream, cmd);
1548                 break;
1549         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1550                 /* bespoke trigger() - handles both FE and BEs */
1551
1552                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1553                                 fe->dai_link->name, cmd);
1554
1555                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1556                 if (ret < 0) {
1557                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1558                         goto out;
1559                 }
1560                 break;
1561         default:
1562                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1563                                 fe->dai_link->name);
1564                 ret = -EINVAL;
1565                 goto out;
1566         }
1567
1568         switch (cmd) {
1569         case SNDRV_PCM_TRIGGER_START:
1570         case SNDRV_PCM_TRIGGER_RESUME:
1571         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1572                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1573                 break;
1574         case SNDRV_PCM_TRIGGER_STOP:
1575         case SNDRV_PCM_TRIGGER_SUSPEND:
1576         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1577                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1578                 break;
1579         }
1580
1581 out:
1582         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1583         return ret;
1584 }
1585
1586 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1587 {
1588         struct snd_soc_dpcm *dpcm;
1589         int ret = 0;
1590
1591         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1592
1593                 struct snd_soc_pcm_runtime *be = dpcm->be;
1594                 struct snd_pcm_substream *be_substream =
1595                         snd_soc_dpcm_get_substream(be, stream);
1596
1597                 /* is this op for this BE ? */
1598                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1599                         continue;
1600
1601                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1602                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1603                         continue;
1604
1605                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
1606                         dpcm->fe->dai_link->name);
1607
1608                 ret = soc_pcm_prepare(be_substream);
1609                 if (ret < 0) {
1610                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
1611                                 ret);
1612                         break;
1613                 }
1614
1615                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1616         }
1617         return ret;
1618 }
1619
1620 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1621 {
1622         struct snd_soc_pcm_runtime *fe = substream->private_data;
1623         int stream = substream->stream, ret = 0;
1624
1625         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1626
1627         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
1628
1629         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1630
1631         /* there is no point preparing this FE if there are no BEs */
1632         if (list_empty(&fe->dpcm[stream].be_clients)) {
1633                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
1634                                 fe->dai_link->name);
1635                 ret = -EINVAL;
1636                 goto out;
1637         }
1638
1639         ret = dpcm_be_dai_prepare(fe, substream->stream);
1640         if (ret < 0)
1641                 goto out;
1642
1643         /* call prepare on the frontend */
1644         ret = soc_pcm_prepare(substream);
1645         if (ret < 0) {
1646                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
1647                         fe->dai_link->name);
1648                 goto out;
1649         }
1650
1651         /* run the stream event for each BE */
1652         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1653         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1654
1655 out:
1656         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1657         mutex_unlock(&fe->card->mutex);
1658
1659         return ret;
1660 }
1661
1662 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1663                      unsigned int cmd, void *arg)
1664 {
1665         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1666         struct snd_soc_platform *platform = rtd->platform;
1667
1668         if (platform->driver->ops->ioctl)
1669                 return platform->driver->ops->ioctl(substream, cmd, arg);
1670         return snd_pcm_lib_ioctl(substream, cmd, arg);
1671 }
1672
1673 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1674 {
1675         struct snd_pcm_substream *substream =
1676                 snd_soc_dpcm_get_substream(fe, stream);
1677         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1678         int err;
1679
1680         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
1681                         stream ? "capture" : "playback", fe->dai_link->name);
1682
1683         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1684                 /* call bespoke trigger - FE takes care of all BE triggers */
1685                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
1686                                 fe->dai_link->name);
1687
1688                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1689                 if (err < 0)
1690                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1691         } else {
1692                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
1693                         fe->dai_link->name);
1694
1695                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1696                 if (err < 0)
1697                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
1698         }
1699
1700         err = dpcm_be_dai_hw_free(fe, stream);
1701         if (err < 0)
1702                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
1703
1704         err = dpcm_be_dai_shutdown(fe, stream);
1705         if (err < 0)
1706                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
1707
1708         /* run the stream event for each BE */
1709         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1710
1711         return 0;
1712 }
1713
1714 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1715 {
1716         struct snd_pcm_substream *substream =
1717                 snd_soc_dpcm_get_substream(fe, stream);
1718         struct snd_soc_dpcm *dpcm;
1719         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1720         int ret;
1721
1722         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
1723                         stream ? "capture" : "playback", fe->dai_link->name);
1724
1725         /* Only start the BE if the FE is ready */
1726         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1727                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1728                 return -EINVAL;
1729
1730         /* startup must always be called for new BEs */
1731         ret = dpcm_be_dai_startup(fe, stream);
1732         if (ret < 0) {
1733                 goto disconnect;
1734                 return ret;
1735         }
1736
1737         /* keep going if FE state is > open */
1738         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1739                 return 0;
1740
1741         ret = dpcm_be_dai_hw_params(fe, stream);
1742         if (ret < 0) {
1743                 goto close;
1744                 return ret;
1745         }
1746
1747         /* keep going if FE state is > hw_params */
1748         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1749                 return 0;
1750
1751
1752         ret = dpcm_be_dai_prepare(fe, stream);
1753         if (ret < 0) {
1754                 goto hw_free;
1755                 return ret;
1756         }
1757
1758         /* run the stream event for each BE */
1759         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1760
1761         /* keep going if FE state is > prepare */
1762         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1763                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1764                 return 0;
1765
1766         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1767                 /* call trigger on the frontend - FE takes care of all BE triggers */
1768                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
1769                                 fe->dai_link->name);
1770
1771                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1772                 if (ret < 0) {
1773                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
1774                         goto hw_free;
1775                 }
1776         } else {
1777                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
1778                         fe->dai_link->name);
1779
1780                 ret = dpcm_be_dai_trigger(fe, stream,
1781                                         SNDRV_PCM_TRIGGER_START);
1782                 if (ret < 0) {
1783                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1784                         goto hw_free;
1785                 }
1786         }
1787
1788         return 0;
1789
1790 hw_free:
1791         dpcm_be_dai_hw_free(fe, stream);
1792 close:
1793         dpcm_be_dai_shutdown(fe, stream);
1794 disconnect:
1795         /* disconnect any non started BEs */
1796         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1797                 struct snd_soc_pcm_runtime *be = dpcm->be;
1798                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1799                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1800         }
1801
1802         return ret;
1803 }
1804
1805 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1806 {
1807         int ret;
1808
1809         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1810         ret = dpcm_run_update_startup(fe, stream);
1811         if (ret < 0)
1812                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
1813         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1814
1815         return ret;
1816 }
1817
1818 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1819 {
1820         int ret;
1821
1822         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1823         ret = dpcm_run_update_shutdown(fe, stream);
1824         if (ret < 0)
1825                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
1826         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1827
1828         return ret;
1829 }
1830
1831 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1832  * any DAI links.
1833  */
1834 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1835 {
1836         struct snd_soc_card *card;
1837         int i, old, new, paths;
1838
1839         if (widget->codec)
1840                 card = widget->codec->card;
1841         else if (widget->platform)
1842                 card = widget->platform->card;
1843         else
1844                 return -EINVAL;
1845
1846         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1847         for (i = 0; i < card->num_rtd; i++) {
1848                 struct snd_soc_dapm_widget_list *list;
1849                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1850
1851                 /* make sure link is FE */
1852                 if (!fe->dai_link->dynamic)
1853                         continue;
1854
1855                 /* only check active links */
1856                 if (!fe->cpu_dai->active)
1857                         continue;
1858
1859                 /* DAPM sync will call this to update DSP paths */
1860                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
1861                         fe->dai_link->name);
1862
1863                 /* skip if FE doesn't have playback capability */
1864                 if (!fe->cpu_dai->driver->playback.channels_min)
1865                         goto capture;
1866
1867                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1868                 if (paths < 0) {
1869                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1870                                         fe->dai_link->name,  "playback");
1871                         mutex_unlock(&card->mutex);
1872                         return paths;
1873                 }
1874
1875                 /* update any new playback paths */
1876                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1877                 if (new) {
1878                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1879                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1880                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1881                 }
1882
1883                 /* update any old playback paths */
1884                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1885                 if (old) {
1886                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1887                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1888                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1889                 }
1890
1891 capture:
1892                 /* skip if FE doesn't have capture capability */
1893                 if (!fe->cpu_dai->driver->capture.channels_min)
1894                         continue;
1895
1896                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1897                 if (paths < 0) {
1898                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
1899                                         fe->dai_link->name,  "capture");
1900                         mutex_unlock(&card->mutex);
1901                         return paths;
1902                 }
1903
1904                 /* update any new capture paths */
1905                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1906                 if (new) {
1907                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1908                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1909                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1910                 }
1911
1912                 /* update any old capture paths */
1913                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1914                 if (old) {
1915                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1916                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1917                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1918                 }
1919
1920                 dpcm_path_put(&list);
1921         }
1922
1923         mutex_unlock(&card->mutex);
1924         return 0;
1925 }
1926 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1927 {
1928         struct snd_soc_dpcm *dpcm;
1929         struct list_head *clients =
1930                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1931
1932         list_for_each_entry(dpcm, clients, list_be) {
1933
1934                 struct snd_soc_pcm_runtime *be = dpcm->be;
1935                 struct snd_soc_dai *dai = be->codec_dai;
1936                 struct snd_soc_dai_driver *drv = dai->driver;
1937
1938                 if (be->dai_link->ignore_suspend)
1939                         continue;
1940
1941                 dev_dbg(be->dev, "ASoC: BE digital mute %s\n", be->dai_link->name);
1942
1943                 if (drv->ops->digital_mute && dai->playback_active)
1944                                 drv->ops->digital_mute(dai, mute);
1945         }
1946
1947         return 0;
1948 }
1949
1950 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1951 {
1952         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1953         struct snd_soc_dpcm *dpcm;
1954         struct snd_soc_dapm_widget_list *list;
1955         int ret;
1956         int stream = fe_substream->stream;
1957
1958         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1959         fe->dpcm[stream].runtime = fe_substream->runtime;
1960
1961         if (dpcm_path_get(fe, stream, &list) <= 0) {
1962                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
1963                         fe->dai_link->name, stream ? "capture" : "playback");
1964         }
1965
1966         /* calculate valid and active FE <-> BE dpcms */
1967         dpcm_process_paths(fe, stream, &list, 1);
1968
1969         ret = dpcm_fe_dai_startup(fe_substream);
1970         if (ret < 0) {
1971                 /* clean up all links */
1972                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1973                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1974
1975                 dpcm_be_disconnect(fe, stream);
1976                 fe->dpcm[stream].runtime = NULL;
1977         }
1978
1979         dpcm_clear_pending_state(fe, stream);
1980         dpcm_path_put(&list);
1981         mutex_unlock(&fe->card->mutex);
1982         return ret;
1983 }
1984
1985 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1986 {
1987         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1988         struct snd_soc_dpcm *dpcm;
1989         int stream = fe_substream->stream, ret;
1990
1991         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1992         ret = dpcm_fe_dai_shutdown(fe_substream);
1993
1994         /* mark FE's links ready to prune */
1995         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1996                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1997
1998         dpcm_be_disconnect(fe, stream);
1999
2000         fe->dpcm[stream].runtime = NULL;
2001         mutex_unlock(&fe->card->mutex);
2002         return ret;
2003 }
2004
2005 /* create a new pcm */
2006 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2007 {
2008         struct snd_soc_platform *platform = rtd->platform;
2009         struct snd_soc_dai *codec_dai = rtd->codec_dai;
2010         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2011         struct snd_pcm *pcm;
2012         char new_name[64];
2013         int ret = 0, playback = 0, capture = 0;
2014
2015         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2016                 if (cpu_dai->driver->playback.channels_min)
2017                         playback = 1;
2018                 if (cpu_dai->driver->capture.channels_min)
2019                         capture = 1;
2020         } else {
2021                 if (codec_dai->driver->playback.channels_min)
2022                         playback = 1;
2023                 if (codec_dai->driver->capture.channels_min)
2024                         capture = 1;
2025         }
2026
2027         /* create the PCM */
2028         if (rtd->dai_link->no_pcm) {
2029                 snprintf(new_name, sizeof(new_name), "(%s)",
2030                         rtd->dai_link->stream_name);
2031
2032                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2033                                 playback, capture, &pcm);
2034         } else {
2035                 if (rtd->dai_link->dynamic)
2036                         snprintf(new_name, sizeof(new_name), "%s (*)",
2037                                 rtd->dai_link->stream_name);
2038                 else
2039                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2040                                 rtd->dai_link->stream_name, codec_dai->name, num);
2041
2042                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2043                         capture, &pcm);
2044         }
2045         if (ret < 0) {
2046                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2047                         rtd->dai_link->name);
2048                 return ret;
2049         }
2050         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2051
2052         /* DAPM dai link stream work */
2053         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2054
2055         rtd->pcm = pcm;
2056         pcm->private_data = rtd;
2057
2058         if (rtd->dai_link->no_pcm) {
2059                 if (playback)
2060                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2061                 if (capture)
2062                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2063                 goto out;
2064         }
2065
2066         /* ASoC PCM operations */
2067         if (rtd->dai_link->dynamic) {
2068                 rtd->ops.open           = dpcm_fe_dai_open;
2069                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2070                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2071                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2072                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2073                 rtd->ops.close          = dpcm_fe_dai_close;
2074                 rtd->ops.pointer        = soc_pcm_pointer;
2075                 rtd->ops.ioctl          = soc_pcm_ioctl;
2076         } else {
2077                 rtd->ops.open           = soc_pcm_open;
2078                 rtd->ops.hw_params      = soc_pcm_hw_params;
2079                 rtd->ops.prepare        = soc_pcm_prepare;
2080                 rtd->ops.trigger        = soc_pcm_trigger;
2081                 rtd->ops.hw_free        = soc_pcm_hw_free;
2082                 rtd->ops.close          = soc_pcm_close;
2083                 rtd->ops.pointer        = soc_pcm_pointer;
2084                 rtd->ops.ioctl          = soc_pcm_ioctl;
2085         }
2086
2087         if (platform->driver->ops) {
2088                 rtd->ops.ack            = platform->driver->ops->ack;
2089                 rtd->ops.copy           = platform->driver->ops->copy;
2090                 rtd->ops.silence        = platform->driver->ops->silence;
2091                 rtd->ops.page           = platform->driver->ops->page;
2092                 rtd->ops.mmap           = platform->driver->ops->mmap;
2093         }
2094
2095         if (playback)
2096                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2097
2098         if (capture)
2099                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2100
2101         if (platform->driver->pcm_new) {
2102                 ret = platform->driver->pcm_new(rtd);
2103                 if (ret < 0) {
2104                         dev_err(platform->dev,
2105                                 "ASoC: pcm constructor failed: %d\n",
2106                                 ret);
2107                         return ret;
2108                 }
2109         }
2110
2111         pcm->private_free = platform->driver->pcm_free;
2112 out:
2113         dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2114                 cpu_dai->name);
2115         return ret;
2116 }
2117
2118 /* is the current PCM operation for this FE ? */
2119 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2120 {
2121         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2122                 return 1;
2123         return 0;
2124 }
2125 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2126
2127 /* is the current PCM operation for this BE ? */
2128 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2129                 struct snd_soc_pcm_runtime *be, int stream)
2130 {
2131         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2132            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2133                   be->dpcm[stream].runtime_update))
2134                 return 1;
2135         return 0;
2136 }
2137 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2138
2139 /* get the substream for this BE */
2140 struct snd_pcm_substream *
2141         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2142 {
2143         return be->pcm->streams[stream].substream;
2144 }
2145 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2146
2147 /* get the BE runtime state */
2148 enum snd_soc_dpcm_state
2149         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2150 {
2151         return be->dpcm[stream].state;
2152 }
2153 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2154
2155 /* set the BE runtime state */
2156 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2157                 int stream, enum snd_soc_dpcm_state state)
2158 {
2159         be->dpcm[stream].state = state;
2160 }
2161 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2162
2163 /*
2164  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2165  * are not running, paused or suspended for the specified stream direction.
2166  */
2167 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2168                 struct snd_soc_pcm_runtime *be, int stream)
2169 {
2170         struct snd_soc_dpcm *dpcm;
2171         int state;
2172
2173         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2174
2175                 if (dpcm->fe == fe)
2176                         continue;
2177
2178                 state = dpcm->fe->dpcm[stream].state;
2179                 if (state == SND_SOC_DPCM_STATE_START ||
2180                         state == SND_SOC_DPCM_STATE_PAUSED ||
2181                         state == SND_SOC_DPCM_STATE_SUSPEND)
2182                         return 0;
2183         }
2184
2185         /* it's safe to free/stop this BE DAI */
2186         return 1;
2187 }
2188 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2189
2190 /*
2191  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2192  * running, paused or suspended for the specified stream direction.
2193  */
2194 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2195                 struct snd_soc_pcm_runtime *be, int stream)
2196 {
2197         struct snd_soc_dpcm *dpcm;
2198         int state;
2199
2200         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2201
2202                 if (dpcm->fe == fe)
2203                         continue;
2204
2205                 state = dpcm->fe->dpcm[stream].state;
2206                 if (state == SND_SOC_DPCM_STATE_START ||
2207                         state == SND_SOC_DPCM_STATE_PAUSED ||
2208                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2209                         state == SND_SOC_DPCM_STATE_PREPARE)
2210                         return 0;
2211         }
2212
2213         /* it's safe to change hw_params */
2214         return 1;
2215 }
2216 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2217
2218 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2219                 int cmd, struct snd_soc_platform *platform)
2220 {
2221         if (platform->driver->ops->trigger)
2222                 return platform->driver->ops->trigger(substream, cmd);
2223         return 0;
2224 }
2225 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2226
2227 #ifdef CONFIG_DEBUG_FS
2228 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2229 {
2230         switch (state) {
2231         case SND_SOC_DPCM_STATE_NEW:
2232                 return "new";
2233         case SND_SOC_DPCM_STATE_OPEN:
2234                 return "open";
2235         case SND_SOC_DPCM_STATE_HW_PARAMS:
2236                 return "hw_params";
2237         case SND_SOC_DPCM_STATE_PREPARE:
2238                 return "prepare";
2239         case SND_SOC_DPCM_STATE_START:
2240                 return "start";
2241         case SND_SOC_DPCM_STATE_STOP:
2242                 return "stop";
2243         case SND_SOC_DPCM_STATE_SUSPEND:
2244                 return "suspend";
2245         case SND_SOC_DPCM_STATE_PAUSED:
2246                 return "paused";
2247         case SND_SOC_DPCM_STATE_HW_FREE:
2248                 return "hw_free";
2249         case SND_SOC_DPCM_STATE_CLOSE:
2250                 return "close";
2251         }
2252
2253         return "unknown";
2254 }
2255
2256 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2257                                 int stream, char *buf, size_t size)
2258 {
2259         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2260         struct snd_soc_dpcm *dpcm;
2261         ssize_t offset = 0;
2262
2263         /* FE state */
2264         offset += snprintf(buf + offset, size - offset,
2265                         "[%s - %s]\n", fe->dai_link->name,
2266                         stream ? "Capture" : "Playback");
2267
2268         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2269                         dpcm_state_string(fe->dpcm[stream].state));
2270
2271         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2272             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2273                 offset += snprintf(buf + offset, size - offset,
2274                                 "Hardware Params: "
2275                                 "Format = %s, Channels = %d, Rate = %d\n",
2276                                 snd_pcm_format_name(params_format(params)),
2277                                 params_channels(params),
2278                                 params_rate(params));
2279
2280         /* BEs state */
2281         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2282
2283         if (list_empty(&fe->dpcm[stream].be_clients)) {
2284                 offset += snprintf(buf + offset, size - offset,
2285                                 " No active DSP links\n");
2286                 goto out;
2287         }
2288
2289         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2290                 struct snd_soc_pcm_runtime *be = dpcm->be;
2291                 params = &dpcm->hw_params;
2292
2293                 offset += snprintf(buf + offset, size - offset,
2294                                 "- %s\n", be->dai_link->name);
2295
2296                 offset += snprintf(buf + offset, size - offset,
2297                                 "   State: %s\n",
2298                                 dpcm_state_string(be->dpcm[stream].state));
2299
2300                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2301                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2302                         offset += snprintf(buf + offset, size - offset,
2303                                 "   Hardware Params: "
2304                                 "Format = %s, Channels = %d, Rate = %d\n",
2305                                 snd_pcm_format_name(params_format(params)),
2306                                 params_channels(params),
2307                                 params_rate(params));
2308         }
2309
2310 out:
2311         return offset;
2312 }
2313
2314 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2315                                 size_t count, loff_t *ppos)
2316 {
2317         struct snd_soc_pcm_runtime *fe = file->private_data;
2318         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2319         char *buf;
2320
2321         buf = kmalloc(out_count, GFP_KERNEL);
2322         if (!buf)
2323                 return -ENOMEM;
2324
2325         if (fe->cpu_dai->driver->playback.channels_min)
2326                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2327                                         buf + offset, out_count - offset);
2328
2329         if (fe->cpu_dai->driver->capture.channels_min)
2330                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2331                                         buf + offset, out_count - offset);
2332
2333         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2334
2335         kfree(buf);
2336         return ret;
2337 }
2338
2339 static const struct file_operations dpcm_state_fops = {
2340         .open = simple_open,
2341         .read = dpcm_state_read_file,
2342         .llseek = default_llseek,
2343 };
2344
2345 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2346 {
2347         if (!rtd->dai_link)
2348                 return 0;
2349
2350         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2351                         rtd->card->debugfs_card_root);
2352         if (!rtd->debugfs_dpcm_root) {
2353                 dev_dbg(rtd->dev,
2354                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2355                          rtd->dai_link->name);
2356                 return -EINVAL;
2357         }
2358
2359         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2360                                                 rtd->debugfs_dpcm_root,
2361                                                 rtd, &dpcm_state_fops);
2362
2363         return 0;
2364 }
2365 #endif