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