Merge remote-tracking branches 'asoc/fix/dpcm', 'asoc/fix/imx', 'asoc/fix/msm8916...
[sfrench/cifs-2.6.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/pinctrl/consumer.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include <linux/export.h>
27 #include <linux/debugfs.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/soc-dpcm.h>
33 #include <sound/initval.h>
34
35 #define DPCM_MAX_BE_USERS       8
36
37 /*
38  * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
39  *
40  * Returns true if the DAI supports the indicated stream type.
41  */
42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
43 {
44         struct snd_soc_pcm_stream *codec_stream;
45
46         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
47                 codec_stream = &dai->driver->playback;
48         else
49                 codec_stream = &dai->driver->capture;
50
51         /* If the codec specifies any rate at all, it supports the stream. */
52         return codec_stream->rates;
53 }
54
55 /**
56  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
57  * @rtd: ASoC PCM runtime that is activated
58  * @stream: Direction of the PCM stream
59  *
60  * Increments the active count for all the DAIs and components attached to a PCM
61  * runtime. Should typically be called when a stream is opened.
62  *
63  * Must be called with the rtd->pcm_mutex being held
64  */
65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
66 {
67         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
68         int i;
69
70         lockdep_assert_held(&rtd->pcm_mutex);
71
72         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
73                 cpu_dai->playback_active++;
74                 for (i = 0; i < rtd->num_codecs; i++)
75                         rtd->codec_dais[i]->playback_active++;
76         } else {
77                 cpu_dai->capture_active++;
78                 for (i = 0; i < rtd->num_codecs; i++)
79                         rtd->codec_dais[i]->capture_active++;
80         }
81
82         cpu_dai->active++;
83         cpu_dai->component->active++;
84         for (i = 0; i < rtd->num_codecs; i++) {
85                 rtd->codec_dais[i]->active++;
86                 rtd->codec_dais[i]->component->active++;
87         }
88 }
89
90 /**
91  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
92  * @rtd: ASoC PCM runtime that is deactivated
93  * @stream: Direction of the PCM stream
94  *
95  * Decrements the active count for all the DAIs and components attached to a PCM
96  * runtime. Should typically be called when a stream is closed.
97  *
98  * Must be called with the rtd->pcm_mutex being held
99  */
100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
101 {
102         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
103         int i;
104
105         lockdep_assert_held(&rtd->pcm_mutex);
106
107         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
108                 cpu_dai->playback_active--;
109                 for (i = 0; i < rtd->num_codecs; i++)
110                         rtd->codec_dais[i]->playback_active--;
111         } else {
112                 cpu_dai->capture_active--;
113                 for (i = 0; i < rtd->num_codecs; i++)
114                         rtd->codec_dais[i]->capture_active--;
115         }
116
117         cpu_dai->active--;
118         cpu_dai->component->active--;
119         for (i = 0; i < rtd->num_codecs; i++) {
120                 rtd->codec_dais[i]->component->active--;
121                 rtd->codec_dais[i]->active--;
122         }
123 }
124
125 /**
126  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
127  * @rtd: The ASoC PCM runtime that should be checked.
128  *
129  * This function checks whether the power down delay should be ignored for a
130  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
131  * been configured to ignore the delay, or if none of the components benefits
132  * from having the delay.
133  */
134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
135 {
136         int i;
137         bool ignore = true;
138
139         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
140                 return true;
141
142         for (i = 0; i < rtd->num_codecs; i++)
143                 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
144
145         return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
146 }
147
148 /**
149  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
150  * @substream: the pcm substream
151  * @hw: the hardware parameters
152  *
153  * Sets the substream runtime hardware parameters.
154  */
155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
156         const struct snd_pcm_hardware *hw)
157 {
158         struct snd_pcm_runtime *runtime = substream->runtime;
159         runtime->hw.info = hw->info;
160         runtime->hw.formats = hw->formats;
161         runtime->hw.period_bytes_min = hw->period_bytes_min;
162         runtime->hw.period_bytes_max = hw->period_bytes_max;
163         runtime->hw.periods_min = hw->periods_min;
164         runtime->hw.periods_max = hw->periods_max;
165         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
166         runtime->hw.fifo_size = hw->fifo_size;
167         return 0;
168 }
169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
170
171 /* DPCM stream event, send event to FE and all active BEs. */
172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
173         int event)
174 {
175         struct snd_soc_dpcm *dpcm;
176
177         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
178
179                 struct snd_soc_pcm_runtime *be = dpcm->be;
180
181                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
182                                 be->dai_link->name, event, dir);
183
184                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
185                     (be->dpcm[dir].users >= 1))
186                         continue;
187
188                 snd_soc_dapm_stream_event(be, dir, event);
189         }
190
191         snd_soc_dapm_stream_event(fe, dir, event);
192
193         return 0;
194 }
195
196 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
197                                         struct snd_soc_dai *soc_dai)
198 {
199         struct snd_soc_pcm_runtime *rtd = substream->private_data;
200         int ret;
201
202         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
203                                 rtd->dai_link->symmetric_rates)) {
204                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
205                                 soc_dai->rate);
206
207                 ret = snd_pcm_hw_constraint_single(substream->runtime,
208                                                 SNDRV_PCM_HW_PARAM_RATE,
209                                                 soc_dai->rate);
210                 if (ret < 0) {
211                         dev_err(soc_dai->dev,
212                                 "ASoC: Unable to apply rate constraint: %d\n",
213                                 ret);
214                         return ret;
215                 }
216         }
217
218         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
219                                 rtd->dai_link->symmetric_channels)) {
220                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
221                                 soc_dai->channels);
222
223                 ret = snd_pcm_hw_constraint_single(substream->runtime,
224                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
225                                                 soc_dai->channels);
226                 if (ret < 0) {
227                         dev_err(soc_dai->dev,
228                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
229                                 ret);
230                         return ret;
231                 }
232         }
233
234         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
235                                 rtd->dai_link->symmetric_samplebits)) {
236                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
237                                 soc_dai->sample_bits);
238
239                 ret = snd_pcm_hw_constraint_single(substream->runtime,
240                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
241                                                 soc_dai->sample_bits);
242                 if (ret < 0) {
243                         dev_err(soc_dai->dev,
244                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
245                                 ret);
246                         return ret;
247                 }
248         }
249
250         return 0;
251 }
252
253 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
254                                 struct snd_pcm_hw_params *params)
255 {
256         struct snd_soc_pcm_runtime *rtd = substream->private_data;
257         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
258         unsigned int rate, channels, sample_bits, symmetry, i;
259
260         rate = params_rate(params);
261         channels = params_channels(params);
262         sample_bits = snd_pcm_format_physical_width(params_format(params));
263
264         /* reject unmatched parameters when applying symmetry */
265         symmetry = cpu_dai->driver->symmetric_rates ||
266                 rtd->dai_link->symmetric_rates;
267
268         for (i = 0; i < rtd->num_codecs; i++)
269                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
270
271         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
272                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
273                                 cpu_dai->rate, rate);
274                 return -EINVAL;
275         }
276
277         symmetry = cpu_dai->driver->symmetric_channels ||
278                 rtd->dai_link->symmetric_channels;
279
280         for (i = 0; i < rtd->num_codecs; i++)
281                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
282
283         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
284                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
285                                 cpu_dai->channels, channels);
286                 return -EINVAL;
287         }
288
289         symmetry = cpu_dai->driver->symmetric_samplebits ||
290                 rtd->dai_link->symmetric_samplebits;
291
292         for (i = 0; i < rtd->num_codecs; i++)
293                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
294
295         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
296                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
297                                 cpu_dai->sample_bits, sample_bits);
298                 return -EINVAL;
299         }
300
301         return 0;
302 }
303
304 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
305 {
306         struct snd_soc_pcm_runtime *rtd = substream->private_data;
307         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
308         struct snd_soc_dai_link *link = rtd->dai_link;
309         unsigned int symmetry, i;
310
311         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
312                 cpu_driver->symmetric_channels || link->symmetric_channels ||
313                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
314
315         for (i = 0; i < rtd->num_codecs; i++)
316                 symmetry = symmetry ||
317                         rtd->codec_dais[i]->driver->symmetric_rates ||
318                         rtd->codec_dais[i]->driver->symmetric_channels ||
319                         rtd->codec_dais[i]->driver->symmetric_samplebits;
320
321         return symmetry;
322 }
323
324 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
325 {
326         struct snd_soc_pcm_runtime *rtd = substream->private_data;
327         int ret;
328
329         if (!bits)
330                 return;
331
332         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
333         if (ret != 0)
334                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
335                                  bits, ret);
336 }
337
338 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
339 {
340         struct snd_soc_pcm_runtime *rtd = substream->private_data;
341         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
342         struct snd_soc_dai *codec_dai;
343         int i;
344         unsigned int bits = 0, cpu_bits;
345
346         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
347                 for (i = 0; i < rtd->num_codecs; i++) {
348                         codec_dai = rtd->codec_dais[i];
349                         if (codec_dai->driver->playback.sig_bits == 0) {
350                                 bits = 0;
351                                 break;
352                         }
353                         bits = max(codec_dai->driver->playback.sig_bits, bits);
354                 }
355                 cpu_bits = cpu_dai->driver->playback.sig_bits;
356         } else {
357                 for (i = 0; i < rtd->num_codecs; i++) {
358                         codec_dai = rtd->codec_dais[i];
359                         if (codec_dai->driver->capture.sig_bits == 0) {
360                                 bits = 0;
361                                 break;
362                         }
363                         bits = max(codec_dai->driver->capture.sig_bits, bits);
364                 }
365                 cpu_bits = cpu_dai->driver->capture.sig_bits;
366         }
367
368         soc_pcm_set_msb(substream, bits);
369         soc_pcm_set_msb(substream, cpu_bits);
370 }
371
372 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
373 {
374         struct snd_pcm_runtime *runtime = substream->runtime;
375         struct snd_pcm_hardware *hw = &runtime->hw;
376         struct snd_soc_pcm_runtime *rtd = substream->private_data;
377         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
378         struct snd_soc_dai_driver *codec_dai_drv;
379         struct snd_soc_pcm_stream *codec_stream;
380         struct snd_soc_pcm_stream *cpu_stream;
381         unsigned int chan_min = 0, chan_max = UINT_MAX;
382         unsigned int rate_min = 0, rate_max = UINT_MAX;
383         unsigned int rates = UINT_MAX;
384         u64 formats = ULLONG_MAX;
385         int i;
386
387         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
388                 cpu_stream = &cpu_dai_drv->playback;
389         else
390                 cpu_stream = &cpu_dai_drv->capture;
391
392         /* first calculate min/max only for CODECs in the DAI link */
393         for (i = 0; i < rtd->num_codecs; i++) {
394
395                 /*
396                  * Skip CODECs which don't support the current stream type.
397                  * Otherwise, since the rate, channel, and format values will
398                  * zero in that case, we would have no usable settings left,
399                  * causing the resulting setup to fail.
400                  * At least one CODEC should match, otherwise we should have
401                  * bailed out on a higher level, since there would be no
402                  * CODEC to support the transfer direction in that case.
403                  */
404                 if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
405                                               substream->stream))
406                         continue;
407
408                 codec_dai_drv = rtd->codec_dais[i]->driver;
409                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
410                         codec_stream = &codec_dai_drv->playback;
411                 else
412                         codec_stream = &codec_dai_drv->capture;
413                 chan_min = max(chan_min, codec_stream->channels_min);
414                 chan_max = min(chan_max, codec_stream->channels_max);
415                 rate_min = max(rate_min, codec_stream->rate_min);
416                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
417                 formats &= codec_stream->formats;
418                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
419         }
420
421         /*
422          * chan min/max cannot be enforced if there are multiple CODEC DAIs
423          * connected to a single CPU DAI, use CPU DAI's directly and let
424          * channel allocation be fixed up later
425          */
426         if (rtd->num_codecs > 1) {
427                 chan_min = cpu_stream->channels_min;
428                 chan_max = cpu_stream->channels_max;
429         }
430
431         hw->channels_min = max(chan_min, cpu_stream->channels_min);
432         hw->channels_max = min(chan_max, cpu_stream->channels_max);
433         if (hw->formats)
434                 hw->formats &= formats & cpu_stream->formats;
435         else
436                 hw->formats = formats & cpu_stream->formats;
437         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
438
439         snd_pcm_limit_hw_rates(runtime);
440
441         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
442         hw->rate_min = max(hw->rate_min, rate_min);
443         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
444         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
445 }
446
447 /*
448  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
449  * then initialized and any private data can be allocated. This also calls
450  * startup for the cpu DAI, platform, machine and codec DAI.
451  */
452 static int soc_pcm_open(struct snd_pcm_substream *substream)
453 {
454         struct snd_soc_pcm_runtime *rtd = substream->private_data;
455         struct snd_pcm_runtime *runtime = substream->runtime;
456         struct snd_soc_platform *platform = rtd->platform;
457         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
458         struct snd_soc_dai *codec_dai;
459         const char *codec_dai_name = "multicodec";
460         int i, ret = 0;
461
462         pinctrl_pm_select_default_state(cpu_dai->dev);
463         for (i = 0; i < rtd->num_codecs; i++)
464                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
465         pm_runtime_get_sync(cpu_dai->dev);
466         for (i = 0; i < rtd->num_codecs; i++)
467                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
468         pm_runtime_get_sync(platform->dev);
469
470         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
471
472         /* startup the audio subsystem */
473         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
474                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
475                 if (ret < 0) {
476                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
477                                 " %s: %d\n", cpu_dai->name, ret);
478                         goto out;
479                 }
480         }
481
482         if (platform->driver->ops && platform->driver->ops->open) {
483                 ret = platform->driver->ops->open(substream);
484                 if (ret < 0) {
485                         dev_err(platform->dev, "ASoC: can't open platform"
486                                 " %s: %d\n", platform->component.name, ret);
487                         goto platform_err;
488                 }
489         }
490
491         for (i = 0; i < rtd->num_codecs; i++) {
492                 codec_dai = rtd->codec_dais[i];
493                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
494                         ret = codec_dai->driver->ops->startup(substream,
495                                                               codec_dai);
496                         if (ret < 0) {
497                                 dev_err(codec_dai->dev,
498                                         "ASoC: can't open codec %s: %d\n",
499                                         codec_dai->name, ret);
500                                 goto codec_dai_err;
501                         }
502                 }
503
504                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
505                         codec_dai->tx_mask = 0;
506                 else
507                         codec_dai->rx_mask = 0;
508         }
509
510         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
511                 ret = rtd->dai_link->ops->startup(substream);
512                 if (ret < 0) {
513                         pr_err("ASoC: %s startup failed: %d\n",
514                                rtd->dai_link->name, ret);
515                         goto machine_err;
516                 }
517         }
518
519         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
520         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
521                 goto dynamic;
522
523         /* Check that the codec and cpu DAIs are compatible */
524         soc_pcm_init_runtime_hw(substream);
525
526         if (rtd->num_codecs == 1)
527                 codec_dai_name = rtd->codec_dai->name;
528
529         if (soc_pcm_has_symmetry(substream))
530                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
531
532         ret = -EINVAL;
533         if (!runtime->hw.rates) {
534                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
535                         codec_dai_name, cpu_dai->name);
536                 goto config_err;
537         }
538         if (!runtime->hw.formats) {
539                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
540                         codec_dai_name, cpu_dai->name);
541                 goto config_err;
542         }
543         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
544             runtime->hw.channels_min > runtime->hw.channels_max) {
545                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
546                                 codec_dai_name, cpu_dai->name);
547                 goto config_err;
548         }
549
550         soc_pcm_apply_msb(substream);
551
552         /* Symmetry only applies if we've already got an active stream. */
553         if (cpu_dai->active) {
554                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
555                 if (ret != 0)
556                         goto config_err;
557         }
558
559         for (i = 0; i < rtd->num_codecs; i++) {
560                 if (rtd->codec_dais[i]->active) {
561                         ret = soc_pcm_apply_symmetry(substream,
562                                                      rtd->codec_dais[i]);
563                         if (ret != 0)
564                                 goto config_err;
565                 }
566         }
567
568         pr_debug("ASoC: %s <-> %s info:\n",
569                         codec_dai_name, cpu_dai->name);
570         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
571         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
572                  runtime->hw.channels_max);
573         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
574                  runtime->hw.rate_max);
575
576 dynamic:
577
578         snd_soc_runtime_activate(rtd, substream->stream);
579
580         mutex_unlock(&rtd->pcm_mutex);
581         return 0;
582
583 config_err:
584         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
585                 rtd->dai_link->ops->shutdown(substream);
586
587 machine_err:
588         i = rtd->num_codecs;
589
590 codec_dai_err:
591         while (--i >= 0) {
592                 codec_dai = rtd->codec_dais[i];
593                 if (codec_dai->driver->ops->shutdown)
594                         codec_dai->driver->ops->shutdown(substream, codec_dai);
595         }
596
597         if (platform->driver->ops && platform->driver->ops->close)
598                 platform->driver->ops->close(substream);
599
600 platform_err:
601         if (cpu_dai->driver->ops->shutdown)
602                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
603 out:
604         mutex_unlock(&rtd->pcm_mutex);
605
606         pm_runtime_mark_last_busy(platform->dev);
607         pm_runtime_put_autosuspend(platform->dev);
608         for (i = 0; i < rtd->num_codecs; i++) {
609                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
610                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
611         }
612
613         pm_runtime_mark_last_busy(cpu_dai->dev);
614         pm_runtime_put_autosuspend(cpu_dai->dev);
615         for (i = 0; i < rtd->num_codecs; i++) {
616                 if (!rtd->codec_dais[i]->active)
617                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
618         }
619         if (!cpu_dai->active)
620                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
621
622         return ret;
623 }
624
625 /*
626  * Power down the audio subsystem pmdown_time msecs after close is called.
627  * This is to ensure there are no pops or clicks in between any music tracks
628  * due to DAPM power cycling.
629  */
630 static void close_delayed_work(struct work_struct *work)
631 {
632         struct snd_soc_pcm_runtime *rtd =
633                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
634         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
635
636         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
637
638         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
639                  codec_dai->driver->playback.stream_name,
640                  codec_dai->playback_active ? "active" : "inactive",
641                  rtd->pop_wait ? "yes" : "no");
642
643         /* are we waiting on this codec DAI stream */
644         if (rtd->pop_wait == 1) {
645                 rtd->pop_wait = 0;
646                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
647                                           SND_SOC_DAPM_STREAM_STOP);
648         }
649
650         mutex_unlock(&rtd->pcm_mutex);
651 }
652
653 /*
654  * Called by ALSA when a PCM substream is closed. Private data can be
655  * freed here. The cpu DAI, codec DAI, machine and platform are also
656  * shutdown.
657  */
658 static int soc_pcm_close(struct snd_pcm_substream *substream)
659 {
660         struct snd_soc_pcm_runtime *rtd = substream->private_data;
661         struct snd_soc_platform *platform = rtd->platform;
662         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
663         struct snd_soc_dai *codec_dai;
664         int i;
665
666         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
667
668         snd_soc_runtime_deactivate(rtd, substream->stream);
669
670         /* clear the corresponding DAIs rate when inactive */
671         if (!cpu_dai->active)
672                 cpu_dai->rate = 0;
673
674         for (i = 0; i < rtd->num_codecs; i++) {
675                 codec_dai = rtd->codec_dais[i];
676                 if (!codec_dai->active)
677                         codec_dai->rate = 0;
678         }
679
680         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
681
682         if (cpu_dai->driver->ops->shutdown)
683                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
684
685         for (i = 0; i < rtd->num_codecs; i++) {
686                 codec_dai = rtd->codec_dais[i];
687                 if (codec_dai->driver->ops->shutdown)
688                         codec_dai->driver->ops->shutdown(substream, codec_dai);
689         }
690
691         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
692                 rtd->dai_link->ops->shutdown(substream);
693
694         if (platform->driver->ops && platform->driver->ops->close)
695                 platform->driver->ops->close(substream);
696
697         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
698                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
699                         /* powered down playback stream now */
700                         snd_soc_dapm_stream_event(rtd,
701                                                   SNDRV_PCM_STREAM_PLAYBACK,
702                                                   SND_SOC_DAPM_STREAM_STOP);
703                 } else {
704                         /* start delayed pop wq here for playback streams */
705                         rtd->pop_wait = 1;
706                         queue_delayed_work(system_power_efficient_wq,
707                                            &rtd->delayed_work,
708                                            msecs_to_jiffies(rtd->pmdown_time));
709                 }
710         } else {
711                 /* capture streams can be powered down now */
712                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
713                                           SND_SOC_DAPM_STREAM_STOP);
714         }
715
716         mutex_unlock(&rtd->pcm_mutex);
717
718         pm_runtime_mark_last_busy(platform->dev);
719         pm_runtime_put_autosuspend(platform->dev);
720
721         for (i = 0; i < rtd->num_codecs; i++) {
722                 pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
723                 pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
724         }
725
726         pm_runtime_mark_last_busy(cpu_dai->dev);
727         pm_runtime_put_autosuspend(cpu_dai->dev);
728
729         for (i = 0; i < rtd->num_codecs; i++) {
730                 if (!rtd->codec_dais[i]->active)
731                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
732         }
733         if (!cpu_dai->active)
734                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
735
736         return 0;
737 }
738
739 /*
740  * Called by ALSA when the PCM substream is prepared, can set format, sample
741  * rate, etc.  This function is non atomic and can be called multiple times,
742  * it can refer to the runtime info.
743  */
744 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
745 {
746         struct snd_soc_pcm_runtime *rtd = substream->private_data;
747         struct snd_soc_platform *platform = rtd->platform;
748         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
749         struct snd_soc_dai *codec_dai;
750         int i, ret = 0;
751
752         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
753
754         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
755                 ret = rtd->dai_link->ops->prepare(substream);
756                 if (ret < 0) {
757                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
758                                 " %d\n", ret);
759                         goto out;
760                 }
761         }
762
763         if (platform->driver->ops && platform->driver->ops->prepare) {
764                 ret = platform->driver->ops->prepare(substream);
765                 if (ret < 0) {
766                         dev_err(platform->dev, "ASoC: platform prepare error:"
767                                 " %d\n", ret);
768                         goto out;
769                 }
770         }
771
772         for (i = 0; i < rtd->num_codecs; i++) {
773                 codec_dai = rtd->codec_dais[i];
774                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
775                         ret = codec_dai->driver->ops->prepare(substream,
776                                                               codec_dai);
777                         if (ret < 0) {
778                                 dev_err(codec_dai->dev,
779                                         "ASoC: codec DAI prepare error: %d\n",
780                                         ret);
781                                 goto out;
782                         }
783                 }
784         }
785
786         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
787                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
788                 if (ret < 0) {
789                         dev_err(cpu_dai->dev,
790                                 "ASoC: cpu DAI prepare error: %d\n", ret);
791                         goto out;
792                 }
793         }
794
795         /* cancel any delayed stream shutdown that is pending */
796         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
797             rtd->pop_wait) {
798                 rtd->pop_wait = 0;
799                 cancel_delayed_work(&rtd->delayed_work);
800         }
801
802         snd_soc_dapm_stream_event(rtd, substream->stream,
803                         SND_SOC_DAPM_STREAM_START);
804
805         for (i = 0; i < rtd->num_codecs; i++)
806                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
807                                          substream->stream);
808         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
809
810 out:
811         mutex_unlock(&rtd->pcm_mutex);
812         return ret;
813 }
814
815 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
816                                        unsigned int mask)
817 {
818         struct snd_interval *interval;
819         int channels = hweight_long(mask);
820
821         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
822         interval->min = channels;
823         interval->max = channels;
824 }
825
826 int soc_dai_hw_params(struct snd_pcm_substream *substream,
827                       struct snd_pcm_hw_params *params,
828                       struct snd_soc_dai *dai)
829 {
830         int ret;
831
832         if (dai->driver->ops && dai->driver->ops->hw_params) {
833                 ret = dai->driver->ops->hw_params(substream, params, dai);
834                 if (ret < 0) {
835                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
836                                 dai->name, ret);
837                         return ret;
838                 }
839         }
840
841         return 0;
842 }
843
844 /*
845  * Called by ALSA when the hardware params are set by application. This
846  * function can also be called multiple times and can allocate buffers
847  * (using snd_pcm_lib_* ). It's non-atomic.
848  */
849 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
850                                 struct snd_pcm_hw_params *params)
851 {
852         struct snd_soc_pcm_runtime *rtd = substream->private_data;
853         struct snd_soc_platform *platform = rtd->platform;
854         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
855         int i, ret = 0;
856
857         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
858
859         ret = soc_pcm_params_symmetry(substream, params);
860         if (ret)
861                 goto out;
862
863         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
864                 ret = rtd->dai_link->ops->hw_params(substream, params);
865                 if (ret < 0) {
866                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
867                                 " failed: %d\n", ret);
868                         goto out;
869                 }
870         }
871
872         for (i = 0; i < rtd->num_codecs; i++) {
873                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
874                 struct snd_pcm_hw_params codec_params;
875
876                 /*
877                  * Skip CODECs which don't support the current stream type,
878                  * the idea being that if a CODEC is not used for the currently
879                  * set up transfer direction, it should not need to be
880                  * configured, especially since the configuration used might
881                  * not even be supported by that CODEC. There may be cases
882                  * however where a CODEC needs to be set up although it is
883                  * actually not being used for the transfer, e.g. if a
884                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
885                  * for the DAI link including a playback-only CODEC.
886                  * If this becomes necessary, we will have to augment the
887                  * machine driver setup with information on how to act, so
888                  * we can do the right thing here.
889                  */
890                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
891                         continue;
892
893                 /* copy params for each codec */
894                 codec_params = *params;
895
896                 /* fixup params based on TDM slot masks */
897                 if (codec_dai->tx_mask)
898                         soc_pcm_codec_params_fixup(&codec_params,
899                                                    codec_dai->tx_mask);
900                 if (codec_dai->rx_mask)
901                         soc_pcm_codec_params_fixup(&codec_params,
902                                                    codec_dai->rx_mask);
903
904                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
905                 if(ret < 0)
906                         goto codec_err;
907
908                 codec_dai->rate = params_rate(&codec_params);
909                 codec_dai->channels = params_channels(&codec_params);
910                 codec_dai->sample_bits = snd_pcm_format_physical_width(
911                                                 params_format(&codec_params));
912         }
913
914         ret = soc_dai_hw_params(substream, params, cpu_dai);
915         if (ret < 0)
916                 goto interface_err;
917
918         if (platform->driver->ops && platform->driver->ops->hw_params) {
919                 ret = platform->driver->ops->hw_params(substream, params);
920                 if (ret < 0) {
921                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
922                                platform->component.name, ret);
923                         goto platform_err;
924                 }
925         }
926
927         /* store the parameters for each DAIs */
928         cpu_dai->rate = params_rate(params);
929         cpu_dai->channels = params_channels(params);
930         cpu_dai->sample_bits =
931                 snd_pcm_format_physical_width(params_format(params));
932
933 out:
934         mutex_unlock(&rtd->pcm_mutex);
935         return ret;
936
937 platform_err:
938         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
939                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
940
941 interface_err:
942         i = rtd->num_codecs;
943
944 codec_err:
945         while (--i >= 0) {
946                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
947                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
948                         codec_dai->driver->ops->hw_free(substream, codec_dai);
949                 codec_dai->rate = 0;
950         }
951
952         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
953                 rtd->dai_link->ops->hw_free(substream);
954
955         mutex_unlock(&rtd->pcm_mutex);
956         return ret;
957 }
958
959 /*
960  * Frees resources allocated by hw_params, can be called multiple times
961  */
962 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
963 {
964         struct snd_soc_pcm_runtime *rtd = substream->private_data;
965         struct snd_soc_platform *platform = rtd->platform;
966         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
967         struct snd_soc_dai *codec_dai;
968         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
969         int i;
970
971         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
972
973         /* clear the corresponding DAIs parameters when going to be inactive */
974         if (cpu_dai->active == 1) {
975                 cpu_dai->rate = 0;
976                 cpu_dai->channels = 0;
977                 cpu_dai->sample_bits = 0;
978         }
979
980         for (i = 0; i < rtd->num_codecs; i++) {
981                 codec_dai = rtd->codec_dais[i];
982                 if (codec_dai->active == 1) {
983                         codec_dai->rate = 0;
984                         codec_dai->channels = 0;
985                         codec_dai->sample_bits = 0;
986                 }
987         }
988
989         /* apply codec digital mute */
990         for (i = 0; i < rtd->num_codecs; i++) {
991                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
992                     (!playback && rtd->codec_dais[i]->capture_active == 1))
993                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
994                                                  substream->stream);
995         }
996
997         /* free any machine hw params */
998         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
999                 rtd->dai_link->ops->hw_free(substream);
1000
1001         /* free any DMA resources */
1002         if (platform->driver->ops && platform->driver->ops->hw_free)
1003                 platform->driver->ops->hw_free(substream);
1004
1005         /* now free hw params for the DAIs  */
1006         for (i = 0; i < rtd->num_codecs; i++) {
1007                 codec_dai = rtd->codec_dais[i];
1008                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1009                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1010         }
1011
1012         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1013                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1014
1015         mutex_unlock(&rtd->pcm_mutex);
1016         return 0;
1017 }
1018
1019 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1020 {
1021         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1022         struct snd_soc_platform *platform = rtd->platform;
1023         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1024         struct snd_soc_dai *codec_dai;
1025         int i, ret;
1026
1027         for (i = 0; i < rtd->num_codecs; i++) {
1028                 codec_dai = rtd->codec_dais[i];
1029                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1030                         ret = codec_dai->driver->ops->trigger(substream,
1031                                                               cmd, codec_dai);
1032                         if (ret < 0)
1033                                 return ret;
1034                 }
1035         }
1036
1037         if (platform->driver->ops && platform->driver->ops->trigger) {
1038                 ret = platform->driver->ops->trigger(substream, cmd);
1039                 if (ret < 0)
1040                         return ret;
1041         }
1042
1043         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1044                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1045                 if (ret < 0)
1046                         return ret;
1047         }
1048
1049         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1050                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1051                 if (ret < 0)
1052                         return ret;
1053         }
1054
1055         return 0;
1056 }
1057
1058 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1059                                    int cmd)
1060 {
1061         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1062         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1063         struct snd_soc_dai *codec_dai;
1064         int i, ret;
1065
1066         for (i = 0; i < rtd->num_codecs; i++) {
1067                 codec_dai = rtd->codec_dais[i];
1068                 if (codec_dai->driver->ops &&
1069                     codec_dai->driver->ops->bespoke_trigger) {
1070                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1071                                                                 cmd, codec_dai);
1072                         if (ret < 0)
1073                                 return ret;
1074                 }
1075         }
1076
1077         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1078                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1079                 if (ret < 0)
1080                         return ret;
1081         }
1082         return 0;
1083 }
1084 /*
1085  * soc level wrapper for pointer callback
1086  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1087  * the runtime->delay will be updated accordingly.
1088  */
1089 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1090 {
1091         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1092         struct snd_soc_platform *platform = rtd->platform;
1093         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1094         struct snd_soc_dai *codec_dai;
1095         struct snd_pcm_runtime *runtime = substream->runtime;
1096         snd_pcm_uframes_t offset = 0;
1097         snd_pcm_sframes_t delay = 0;
1098         snd_pcm_sframes_t codec_delay = 0;
1099         int i;
1100
1101         if (platform->driver->ops && platform->driver->ops->pointer)
1102                 offset = platform->driver->ops->pointer(substream);
1103
1104         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1105                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1106
1107         for (i = 0; i < rtd->num_codecs; i++) {
1108                 codec_dai = rtd->codec_dais[i];
1109                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1110                         codec_delay = max(codec_delay,
1111                                         codec_dai->driver->ops->delay(substream,
1112                                                                     codec_dai));
1113         }
1114         delay += codec_delay;
1115
1116         runtime->delay = delay;
1117
1118         return offset;
1119 }
1120
1121 /* connect a FE and BE */
1122 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1123                 struct snd_soc_pcm_runtime *be, int stream)
1124 {
1125         struct snd_soc_dpcm *dpcm;
1126
1127         /* only add new dpcms */
1128         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1129                 if (dpcm->be == be && dpcm->fe == fe)
1130                         return 0;
1131         }
1132
1133         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1134         if (!dpcm)
1135                 return -ENOMEM;
1136
1137         dpcm->be = be;
1138         dpcm->fe = fe;
1139         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1140         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1141         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1142         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1143
1144         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1145                         stream ? "capture" : "playback",  fe->dai_link->name,
1146                         stream ? "<-" : "->", be->dai_link->name);
1147
1148 #ifdef CONFIG_DEBUG_FS
1149         if (fe->debugfs_dpcm_root)
1150                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1151                                 fe->debugfs_dpcm_root, &dpcm->state);
1152 #endif
1153         return 1;
1154 }
1155
1156 /* reparent a BE onto another FE */
1157 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1158                         struct snd_soc_pcm_runtime *be, int stream)
1159 {
1160         struct snd_soc_dpcm *dpcm;
1161         struct snd_pcm_substream *fe_substream, *be_substream;
1162
1163         /* reparent if BE is connected to other FEs */
1164         if (!be->dpcm[stream].users)
1165                 return;
1166
1167         be_substream = snd_soc_dpcm_get_substream(be, stream);
1168
1169         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1170                 if (dpcm->fe == fe)
1171                         continue;
1172
1173                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1174                         stream ? "capture" : "playback",
1175                         dpcm->fe->dai_link->name,
1176                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1177
1178                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1179                 be_substream->runtime = fe_substream->runtime;
1180                 break;
1181         }
1182 }
1183
1184 /* disconnect a BE and FE */
1185 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1186 {
1187         struct snd_soc_dpcm *dpcm, *d;
1188
1189         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1190                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1191                                 stream ? "capture" : "playback",
1192                                 dpcm->be->dai_link->name);
1193
1194                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1195                         continue;
1196
1197                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1198                         stream ? "capture" : "playback", fe->dai_link->name,
1199                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1200
1201                 /* BEs still alive need new FE */
1202                 dpcm_be_reparent(fe, dpcm->be, stream);
1203
1204 #ifdef CONFIG_DEBUG_FS
1205                 debugfs_remove(dpcm->debugfs_state);
1206 #endif
1207                 list_del(&dpcm->list_be);
1208                 list_del(&dpcm->list_fe);
1209                 kfree(dpcm);
1210         }
1211 }
1212
1213 /* get BE for DAI widget and stream */
1214 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1215                 struct snd_soc_dapm_widget *widget, int stream)
1216 {
1217         struct snd_soc_pcm_runtime *be;
1218         int i;
1219
1220         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1221                 list_for_each_entry(be, &card->rtd_list, list) {
1222
1223                         if (!be->dai_link->no_pcm)
1224                                 continue;
1225
1226                         if (be->cpu_dai->playback_widget == widget)
1227                                 return be;
1228
1229                         for (i = 0; i < be->num_codecs; i++) {
1230                                 struct snd_soc_dai *dai = be->codec_dais[i];
1231                                 if (dai->playback_widget == widget)
1232                                         return be;
1233                         }
1234                 }
1235         } else {
1236
1237                 list_for_each_entry(be, &card->rtd_list, list) {
1238
1239                         if (!be->dai_link->no_pcm)
1240                                 continue;
1241
1242                         if (be->cpu_dai->capture_widget == widget)
1243                                 return be;
1244
1245                         for (i = 0; i < be->num_codecs; i++) {
1246                                 struct snd_soc_dai *dai = be->codec_dais[i];
1247                                 if (dai->capture_widget == widget)
1248                                         return be;
1249                         }
1250                 }
1251         }
1252
1253         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1254                 stream ? "capture" : "playback", widget->name);
1255         return NULL;
1256 }
1257
1258 static inline struct snd_soc_dapm_widget *
1259         dai_get_widget(struct snd_soc_dai *dai, int stream)
1260 {
1261         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1262                 return dai->playback_widget;
1263         else
1264                 return dai->capture_widget;
1265 }
1266
1267 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1268                 struct snd_soc_dapm_widget *widget)
1269 {
1270         int i;
1271
1272         for (i = 0; i < list->num_widgets; i++) {
1273                 if (widget == list->widgets[i])
1274                         return 1;
1275         }
1276
1277         return 0;
1278 }
1279
1280 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1281                 enum snd_soc_dapm_direction dir)
1282 {
1283         struct snd_soc_card *card = widget->dapm->card;
1284         struct snd_soc_pcm_runtime *rtd;
1285         int i;
1286
1287         if (dir == SND_SOC_DAPM_DIR_OUT) {
1288                 list_for_each_entry(rtd, &card->rtd_list, list) {
1289                         if (!rtd->dai_link->no_pcm)
1290                                 continue;
1291
1292                         if (rtd->cpu_dai->playback_widget == widget)
1293                                 return true;
1294
1295                         for (i = 0; i < rtd->num_codecs; ++i) {
1296                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1297                                 if (dai->playback_widget == widget)
1298                                         return true;
1299                         }
1300                 }
1301         } else { /* SND_SOC_DAPM_DIR_IN */
1302                 list_for_each_entry(rtd, &card->rtd_list, list) {
1303                         if (!rtd->dai_link->no_pcm)
1304                                 continue;
1305
1306                         if (rtd->cpu_dai->capture_widget == widget)
1307                                 return true;
1308
1309                         for (i = 0; i < rtd->num_codecs; ++i) {
1310                                 struct snd_soc_dai *dai = rtd->codec_dais[i];
1311                                 if (dai->capture_widget == widget)
1312                                         return true;
1313                         }
1314                 }
1315         }
1316
1317         return false;
1318 }
1319
1320 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1321         int stream, struct snd_soc_dapm_widget_list **list)
1322 {
1323         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1324         int paths;
1325
1326         /* get number of valid DAI paths and their widgets */
1327         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1328                         dpcm_end_walk_at_be);
1329
1330         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1331                         stream ? "capture" : "playback");
1332
1333         return paths;
1334 }
1335
1336 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1337         struct snd_soc_dapm_widget_list **list_)
1338 {
1339         struct snd_soc_dpcm *dpcm;
1340         struct snd_soc_dapm_widget_list *list = *list_;
1341         struct snd_soc_dapm_widget *widget;
1342         int prune = 0;
1343
1344         /* Destroy any old FE <--> BE connections */
1345         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1346                 unsigned int i;
1347
1348                 /* is there a valid CPU DAI widget for this BE */
1349                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1350
1351                 /* prune the BE if it's no longer in our active list */
1352                 if (widget && widget_in_list(list, widget))
1353                         continue;
1354
1355                 /* is there a valid CODEC DAI widget for this BE */
1356                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1357                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1358                         widget = dai_get_widget(dai, stream);
1359
1360                         /* prune the BE if it's no longer in our active list */
1361                         if (widget && widget_in_list(list, widget))
1362                                 continue;
1363                 }
1364
1365                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1366                         stream ? "capture" : "playback",
1367                         dpcm->be->dai_link->name, fe->dai_link->name);
1368                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1369                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1370                 prune++;
1371         }
1372
1373         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1374         return prune;
1375 }
1376
1377 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1378         struct snd_soc_dapm_widget_list **list_)
1379 {
1380         struct snd_soc_card *card = fe->card;
1381         struct snd_soc_dapm_widget_list *list = *list_;
1382         struct snd_soc_pcm_runtime *be;
1383         int i, new = 0, err;
1384
1385         /* Create any new FE <--> BE connections */
1386         for (i = 0; i < list->num_widgets; i++) {
1387
1388                 switch (list->widgets[i]->id) {
1389                 case snd_soc_dapm_dai_in:
1390                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1391                                 continue;
1392                         break;
1393                 case snd_soc_dapm_dai_out:
1394                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1395                                 continue;
1396                         break;
1397                 default:
1398                         continue;
1399                 }
1400
1401                 /* is there a valid BE rtd for this widget */
1402                 be = dpcm_get_be(card, list->widgets[i], stream);
1403                 if (!be) {
1404                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1405                                         list->widgets[i]->name);
1406                         continue;
1407                 }
1408
1409                 /* make sure BE is a real BE */
1410                 if (!be->dai_link->no_pcm)
1411                         continue;
1412
1413                 /* don't connect if FE is not running */
1414                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1415                         continue;
1416
1417                 /* newly connected FE and BE */
1418                 err = dpcm_be_connect(fe, be, stream);
1419                 if (err < 0) {
1420                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1421                                 list->widgets[i]->name);
1422                         break;
1423                 } else if (err == 0) /* already connected */
1424                         continue;
1425
1426                 /* new */
1427                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1428                 new++;
1429         }
1430
1431         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1432         return new;
1433 }
1434
1435 /*
1436  * Find the corresponding BE DAIs that source or sink audio to this
1437  * FE substream.
1438  */
1439 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1440         int stream, struct snd_soc_dapm_widget_list **list, int new)
1441 {
1442         if (new)
1443                 return dpcm_add_paths(fe, stream, list);
1444         else
1445                 return dpcm_prune_paths(fe, stream, list);
1446 }
1447
1448 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1449 {
1450         struct snd_soc_dpcm *dpcm;
1451
1452         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1453                 dpcm->be->dpcm[stream].runtime_update =
1454                                                 SND_SOC_DPCM_UPDATE_NO;
1455 }
1456
1457 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1458         int stream)
1459 {
1460         struct snd_soc_dpcm *dpcm;
1461
1462         /* disable any enabled and non active backends */
1463         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1464
1465                 struct snd_soc_pcm_runtime *be = dpcm->be;
1466                 struct snd_pcm_substream *be_substream =
1467                         snd_soc_dpcm_get_substream(be, stream);
1468
1469                 if (be->dpcm[stream].users == 0)
1470                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1471                                 stream ? "capture" : "playback",
1472                                 be->dpcm[stream].state);
1473
1474                 if (--be->dpcm[stream].users != 0)
1475                         continue;
1476
1477                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1478                         continue;
1479
1480                 soc_pcm_close(be_substream);
1481                 be_substream->runtime = NULL;
1482                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1483         }
1484 }
1485
1486 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1487 {
1488         struct snd_soc_dpcm *dpcm;
1489         int err, count = 0;
1490
1491         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1492         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1493
1494                 struct snd_soc_pcm_runtime *be = dpcm->be;
1495                 struct snd_pcm_substream *be_substream =
1496                         snd_soc_dpcm_get_substream(be, stream);
1497
1498                 if (!be_substream) {
1499                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1500                                 stream ? "capture" : "playback");
1501                         continue;
1502                 }
1503
1504                 /* is this op for this BE ? */
1505                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1506                         continue;
1507
1508                 /* first time the dpcm is open ? */
1509                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1510                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1511                                 stream ? "capture" : "playback",
1512                                 be->dpcm[stream].state);
1513
1514                 if (be->dpcm[stream].users++ != 0)
1515                         continue;
1516
1517                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1518                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1519                         continue;
1520
1521                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1522                         stream ? "capture" : "playback", be->dai_link->name);
1523
1524                 be_substream->runtime = be->dpcm[stream].runtime;
1525                 err = soc_pcm_open(be_substream);
1526                 if (err < 0) {
1527                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1528                         be->dpcm[stream].users--;
1529                         if (be->dpcm[stream].users < 0)
1530                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1531                                         stream ? "capture" : "playback",
1532                                         be->dpcm[stream].state);
1533
1534                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1535                         goto unwind;
1536                 }
1537
1538                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1539                 count++;
1540         }
1541
1542         return count;
1543
1544 unwind:
1545         /* disable any enabled and non active backends */
1546         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1547                 struct snd_soc_pcm_runtime *be = dpcm->be;
1548                 struct snd_pcm_substream *be_substream =
1549                         snd_soc_dpcm_get_substream(be, stream);
1550
1551                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1552                         continue;
1553
1554                 if (be->dpcm[stream].users == 0)
1555                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1556                                 stream ? "capture" : "playback",
1557                                 be->dpcm[stream].state);
1558
1559                 if (--be->dpcm[stream].users != 0)
1560                         continue;
1561
1562                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1563                         continue;
1564
1565                 soc_pcm_close(be_substream);
1566                 be_substream->runtime = NULL;
1567                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1568         }
1569
1570         return err;
1571 }
1572
1573 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1574                                  struct snd_soc_pcm_stream *stream,
1575                                  u64 formats)
1576 {
1577         runtime->hw.rate_min = stream->rate_min;
1578         runtime->hw.rate_max = stream->rate_max;
1579         runtime->hw.channels_min = stream->channels_min;
1580         runtime->hw.channels_max = stream->channels_max;
1581         if (runtime->hw.formats)
1582                 runtime->hw.formats &= formats & stream->formats;
1583         else
1584                 runtime->hw.formats = formats & stream->formats;
1585         runtime->hw.rates = stream->rates;
1586 }
1587
1588 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1589 {
1590         struct snd_soc_pcm_runtime *fe = substream->private_data;
1591         struct snd_soc_dpcm *dpcm;
1592         u64 formats = ULLONG_MAX;
1593         int stream = substream->stream;
1594
1595         if (!fe->dai_link->dpcm_merged_format)
1596                 return formats;
1597
1598         /*
1599          * It returns merged BE codec format
1600          * if FE want to use it (= dpcm_merged_format)
1601          */
1602
1603         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1604                 struct snd_soc_pcm_runtime *be = dpcm->be;
1605                 struct snd_soc_dai_driver *codec_dai_drv;
1606                 struct snd_soc_pcm_stream *codec_stream;
1607                 int i;
1608
1609                 for (i = 0; i < be->num_codecs; i++) {
1610                         codec_dai_drv = be->codec_dais[i]->driver;
1611                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1612                                 codec_stream = &codec_dai_drv->playback;
1613                         else
1614                                 codec_stream = &codec_dai_drv->capture;
1615
1616                         formats &= codec_stream->formats;
1617                 }
1618         }
1619
1620         return formats;
1621 }
1622
1623 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1624 {
1625         struct snd_pcm_runtime *runtime = substream->runtime;
1626         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1627         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1628         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1629         u64 format = dpcm_runtime_base_format(substream);
1630
1631         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1632                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1633         else
1634                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1635 }
1636
1637 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1638
1639 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1640  * for avoiding the race with trigger callback.
1641  * If the state is unset and a trigger is pending while the previous operation,
1642  * process the pending trigger action here.
1643  */
1644 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1645                                      int stream, enum snd_soc_dpcm_update state)
1646 {
1647         struct snd_pcm_substream *substream =
1648                 snd_soc_dpcm_get_substream(fe, stream);
1649
1650         snd_pcm_stream_lock_irq(substream);
1651         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1652                 dpcm_fe_dai_do_trigger(substream,
1653                                        fe->dpcm[stream].trigger_pending - 1);
1654                 fe->dpcm[stream].trigger_pending = 0;
1655         }
1656         fe->dpcm[stream].runtime_update = state;
1657         snd_pcm_stream_unlock_irq(substream);
1658 }
1659
1660 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1661                                int stream)
1662 {
1663         struct snd_soc_dpcm *dpcm;
1664         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1665         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1666         int err;
1667
1668         /* apply symmetry for FE */
1669         if (soc_pcm_has_symmetry(fe_substream))
1670                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1671
1672         /* Symmetry only applies if we've got an active stream. */
1673         if (fe_cpu_dai->active) {
1674                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1675                 if (err < 0)
1676                         return err;
1677         }
1678
1679         /* apply symmetry for BE */
1680         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1681                 struct snd_soc_pcm_runtime *be = dpcm->be;
1682                 struct snd_pcm_substream *be_substream =
1683                         snd_soc_dpcm_get_substream(be, stream);
1684                 struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1685                 int i;
1686
1687                 if (rtd->dai_link->be_hw_params_fixup)
1688                         continue;
1689
1690                 if (soc_pcm_has_symmetry(be_substream))
1691                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1692
1693                 /* Symmetry only applies if we've got an active stream. */
1694                 if (rtd->cpu_dai->active) {
1695                         err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1696                         if (err < 0)
1697                                 return err;
1698                 }
1699
1700                 for (i = 0; i < rtd->num_codecs; i++) {
1701                         if (rtd->codec_dais[i]->active) {
1702                                 err = soc_pcm_apply_symmetry(be_substream,
1703                                                              rtd->codec_dais[i]);
1704                                 if (err < 0)
1705                                         return err;
1706                         }
1707                 }
1708         }
1709
1710         return 0;
1711 }
1712
1713 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1714 {
1715         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1716         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1717         int stream = fe_substream->stream, ret = 0;
1718
1719         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1720
1721         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1722         if (ret < 0) {
1723                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1724                 goto be_err;
1725         }
1726
1727         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1728
1729         /* start the DAI frontend */
1730         ret = soc_pcm_open(fe_substream);
1731         if (ret < 0) {
1732                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1733                 goto unwind;
1734         }
1735
1736         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1737
1738         dpcm_set_fe_runtime(fe_substream);
1739         snd_pcm_limit_hw_rates(runtime);
1740
1741         ret = dpcm_apply_symmetry(fe_substream, stream);
1742         if (ret < 0) {
1743                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1744                         ret);
1745                 goto unwind;
1746         }
1747
1748         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1749         return 0;
1750
1751 unwind:
1752         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1753 be_err:
1754         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1755         return ret;
1756 }
1757
1758 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1759 {
1760         struct snd_soc_dpcm *dpcm;
1761
1762         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1763         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1764
1765                 struct snd_soc_pcm_runtime *be = dpcm->be;
1766                 struct snd_pcm_substream *be_substream =
1767                         snd_soc_dpcm_get_substream(be, stream);
1768
1769                 /* is this op for this BE ? */
1770                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1771                         continue;
1772
1773                 if (be->dpcm[stream].users == 0)
1774                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1775                                 stream ? "capture" : "playback",
1776                                 be->dpcm[stream].state);
1777
1778                 if (--be->dpcm[stream].users != 0)
1779                         continue;
1780
1781                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1782                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1783                         continue;
1784
1785                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1786                         be->dai_link->name);
1787
1788                 soc_pcm_close(be_substream);
1789                 be_substream->runtime = NULL;
1790
1791                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1792         }
1793         return 0;
1794 }
1795
1796 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1797 {
1798         struct snd_soc_pcm_runtime *fe = substream->private_data;
1799         int stream = substream->stream;
1800
1801         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1802
1803         /* shutdown the BEs */
1804         dpcm_be_dai_shutdown(fe, substream->stream);
1805
1806         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1807
1808         /* now shutdown the frontend */
1809         soc_pcm_close(substream);
1810
1811         /* run the stream event for each BE */
1812         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1813
1814         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1815         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1816         return 0;
1817 }
1818
1819 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1820 {
1821         struct snd_soc_dpcm *dpcm;
1822
1823         /* only hw_params backends that are either sinks or sources
1824          * to this frontend DAI */
1825         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1826
1827                 struct snd_soc_pcm_runtime *be = dpcm->be;
1828                 struct snd_pcm_substream *be_substream =
1829                         snd_soc_dpcm_get_substream(be, stream);
1830
1831                 /* is this op for this BE ? */
1832                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1833                         continue;
1834
1835                 /* only free hw when no longer used - check all FEs */
1836                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1837                                 continue;
1838
1839                 /* do not free hw if this BE is used by other FE */
1840                 if (be->dpcm[stream].users > 1)
1841                         continue;
1842
1843                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1844                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1845                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1846                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1847                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1848                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1849                         continue;
1850
1851                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1852                         be->dai_link->name);
1853
1854                 soc_pcm_hw_free(be_substream);
1855
1856                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1857         }
1858
1859         return 0;
1860 }
1861
1862 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1863 {
1864         struct snd_soc_pcm_runtime *fe = substream->private_data;
1865         int err, stream = substream->stream;
1866
1867         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1868         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1869
1870         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1871
1872         /* call hw_free on the frontend */
1873         err = soc_pcm_hw_free(substream);
1874         if (err < 0)
1875                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1876                         fe->dai_link->name);
1877
1878         /* only hw_params backends that are either sinks or sources
1879          * to this frontend DAI */
1880         err = dpcm_be_dai_hw_free(fe, stream);
1881
1882         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1883         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1884
1885         mutex_unlock(&fe->card->mutex);
1886         return 0;
1887 }
1888
1889 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1890 {
1891         struct snd_soc_dpcm *dpcm;
1892         int ret;
1893
1894         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1895
1896                 struct snd_soc_pcm_runtime *be = dpcm->be;
1897                 struct snd_pcm_substream *be_substream =
1898                         snd_soc_dpcm_get_substream(be, stream);
1899
1900                 /* is this op for this BE ? */
1901                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1902                         continue;
1903
1904                 /* copy params for each dpcm */
1905                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1906                                 sizeof(struct snd_pcm_hw_params));
1907
1908                 /* perform any hw_params fixups */
1909                 if (be->dai_link->be_hw_params_fixup) {
1910                         ret = be->dai_link->be_hw_params_fixup(be,
1911                                         &dpcm->hw_params);
1912                         if (ret < 0) {
1913                                 dev_err(be->dev,
1914                                         "ASoC: hw_params BE fixup failed %d\n",
1915                                         ret);
1916                                 goto unwind;
1917                         }
1918                 }
1919
1920                 /* only allow hw_params() if no connected FEs are running */
1921                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1922                         continue;
1923
1924                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1925                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1926                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1927                         continue;
1928
1929                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1930                         be->dai_link->name);
1931
1932                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1933                 if (ret < 0) {
1934                         dev_err(dpcm->be->dev,
1935                                 "ASoC: hw_params BE failed %d\n", ret);
1936                         goto unwind;
1937                 }
1938
1939                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1940         }
1941         return 0;
1942
1943 unwind:
1944         /* disable any enabled and non active backends */
1945         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1946                 struct snd_soc_pcm_runtime *be = dpcm->be;
1947                 struct snd_pcm_substream *be_substream =
1948                         snd_soc_dpcm_get_substream(be, stream);
1949
1950                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1951                         continue;
1952
1953                 /* only allow hw_free() if no connected FEs are running */
1954                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1955                         continue;
1956
1957                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1958                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1959                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1960                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1961                         continue;
1962
1963                 soc_pcm_hw_free(be_substream);
1964         }
1965
1966         return ret;
1967 }
1968
1969 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1970                                  struct snd_pcm_hw_params *params)
1971 {
1972         struct snd_soc_pcm_runtime *fe = substream->private_data;
1973         int ret, stream = substream->stream;
1974
1975         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1976         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1977
1978         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1979                         sizeof(struct snd_pcm_hw_params));
1980         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1981         if (ret < 0) {
1982                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1983                 goto out;
1984         }
1985
1986         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1987                         fe->dai_link->name, params_rate(params),
1988                         params_channels(params), params_format(params));
1989
1990         /* call hw_params on the frontend */
1991         ret = soc_pcm_hw_params(substream, params);
1992         if (ret < 0) {
1993                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1994                 dpcm_be_dai_hw_free(fe, stream);
1995          } else
1996                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1997
1998 out:
1999         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2000         mutex_unlock(&fe->card->mutex);
2001         return ret;
2002 }
2003
2004 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2005                 struct snd_pcm_substream *substream, int cmd)
2006 {
2007         int ret;
2008
2009         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2010                         dpcm->be->dai_link->name, cmd);
2011
2012         ret = soc_pcm_trigger(substream, cmd);
2013         if (ret < 0)
2014                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2015
2016         return ret;
2017 }
2018
2019 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2020                                int cmd)
2021 {
2022         struct snd_soc_dpcm *dpcm;
2023         int ret = 0;
2024
2025         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2026
2027                 struct snd_soc_pcm_runtime *be = dpcm->be;
2028                 struct snd_pcm_substream *be_substream =
2029                         snd_soc_dpcm_get_substream(be, stream);
2030
2031                 /* is this op for this BE ? */
2032                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2033                         continue;
2034
2035                 switch (cmd) {
2036                 case SNDRV_PCM_TRIGGER_START:
2037                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2038                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2039                                 continue;
2040
2041                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2042                         if (ret)
2043                                 return ret;
2044
2045                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2046                         break;
2047                 case SNDRV_PCM_TRIGGER_RESUME:
2048                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2049                                 continue;
2050
2051                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2052                         if (ret)
2053                                 return ret;
2054
2055                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2056                         break;
2057                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2058                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2059                                 continue;
2060
2061                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2062                         if (ret)
2063                                 return ret;
2064
2065                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2066                         break;
2067                 case SNDRV_PCM_TRIGGER_STOP:
2068                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2069                                 continue;
2070
2071                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2072                                 continue;
2073
2074                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2075                         if (ret)
2076                                 return ret;
2077
2078                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2079                         break;
2080                 case SNDRV_PCM_TRIGGER_SUSPEND:
2081                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2082                                 continue;
2083
2084                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2085                                 continue;
2086
2087                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2088                         if (ret)
2089                                 return ret;
2090
2091                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2092                         break;
2093                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2094                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2095                                 continue;
2096
2097                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2098                                 continue;
2099
2100                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2101                         if (ret)
2102                                 return ret;
2103
2104                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2105                         break;
2106                 }
2107         }
2108
2109         return ret;
2110 }
2111 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2112
2113 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2114 {
2115         struct snd_soc_pcm_runtime *fe = substream->private_data;
2116         int stream = substream->stream, ret;
2117         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2118
2119         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2120
2121         switch (trigger) {
2122         case SND_SOC_DPCM_TRIGGER_PRE:
2123                 /* call trigger on the frontend before the backend. */
2124
2125                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2126                                 fe->dai_link->name, cmd);
2127
2128                 ret = soc_pcm_trigger(substream, cmd);
2129                 if (ret < 0) {
2130                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2131                         goto out;
2132                 }
2133
2134                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2135                 break;
2136         case SND_SOC_DPCM_TRIGGER_POST:
2137                 /* call trigger on the frontend after the backend. */
2138
2139                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2140                 if (ret < 0) {
2141                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2142                         goto out;
2143                 }
2144
2145                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2146                                 fe->dai_link->name, cmd);
2147
2148                 ret = soc_pcm_trigger(substream, cmd);
2149                 break;
2150         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2151                 /* bespoke trigger() - handles both FE and BEs */
2152
2153                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2154                                 fe->dai_link->name, cmd);
2155
2156                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2157                 if (ret < 0) {
2158                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2159                         goto out;
2160                 }
2161                 break;
2162         default:
2163                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2164                                 fe->dai_link->name);
2165                 ret = -EINVAL;
2166                 goto out;
2167         }
2168
2169         switch (cmd) {
2170         case SNDRV_PCM_TRIGGER_START:
2171         case SNDRV_PCM_TRIGGER_RESUME:
2172         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2173                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2174                 break;
2175         case SNDRV_PCM_TRIGGER_STOP:
2176         case SNDRV_PCM_TRIGGER_SUSPEND:
2177                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2178                 break;
2179         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2180                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2181                 break;
2182         }
2183
2184 out:
2185         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2186         return ret;
2187 }
2188
2189 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2190 {
2191         struct snd_soc_pcm_runtime *fe = substream->private_data;
2192         int stream = substream->stream;
2193
2194         /* if FE's runtime_update is already set, we're in race;
2195          * process this trigger later at exit
2196          */
2197         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2198                 fe->dpcm[stream].trigger_pending = cmd + 1;
2199                 return 0; /* delayed, assuming it's successful */
2200         }
2201
2202         /* we're alone, let's trigger */
2203         return dpcm_fe_dai_do_trigger(substream, cmd);
2204 }
2205
2206 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2207 {
2208         struct snd_soc_dpcm *dpcm;
2209         int ret = 0;
2210
2211         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2212
2213                 struct snd_soc_pcm_runtime *be = dpcm->be;
2214                 struct snd_pcm_substream *be_substream =
2215                         snd_soc_dpcm_get_substream(be, stream);
2216
2217                 /* is this op for this BE ? */
2218                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2219                         continue;
2220
2221                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2222                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2223                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2224                         continue;
2225
2226                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2227                         be->dai_link->name);
2228
2229                 ret = soc_pcm_prepare(be_substream);
2230                 if (ret < 0) {
2231                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2232                                 ret);
2233                         break;
2234                 }
2235
2236                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2237         }
2238         return ret;
2239 }
2240
2241 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2242 {
2243         struct snd_soc_pcm_runtime *fe = substream->private_data;
2244         int stream = substream->stream, ret = 0;
2245
2246         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2247
2248         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2249
2250         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2251
2252         /* there is no point preparing this FE if there are no BEs */
2253         if (list_empty(&fe->dpcm[stream].be_clients)) {
2254                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2255                                 fe->dai_link->name);
2256                 ret = -EINVAL;
2257                 goto out;
2258         }
2259
2260         ret = dpcm_be_dai_prepare(fe, substream->stream);
2261         if (ret < 0)
2262                 goto out;
2263
2264         /* call prepare on the frontend */
2265         ret = soc_pcm_prepare(substream);
2266         if (ret < 0) {
2267                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2268                         fe->dai_link->name);
2269                 goto out;
2270         }
2271
2272         /* run the stream event for each BE */
2273         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2274         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2275
2276 out:
2277         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2278         mutex_unlock(&fe->card->mutex);
2279
2280         return ret;
2281 }
2282
2283 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2284                      unsigned int cmd, void *arg)
2285 {
2286         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2287         struct snd_soc_platform *platform = rtd->platform;
2288
2289         if (platform->driver->ops && platform->driver->ops->ioctl)
2290                 return platform->driver->ops->ioctl(substream, cmd, arg);
2291         return snd_pcm_lib_ioctl(substream, cmd, arg);
2292 }
2293
2294 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2295 {
2296         struct snd_pcm_substream *substream =
2297                 snd_soc_dpcm_get_substream(fe, stream);
2298         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2299         int err;
2300
2301         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2302                         stream ? "capture" : "playback", fe->dai_link->name);
2303
2304         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2305                 /* call bespoke trigger - FE takes care of all BE triggers */
2306                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2307                                 fe->dai_link->name);
2308
2309                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2310                 if (err < 0)
2311                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2312         } else {
2313                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2314                         fe->dai_link->name);
2315
2316                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2317                 if (err < 0)
2318                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2319         }
2320
2321         err = dpcm_be_dai_hw_free(fe, stream);
2322         if (err < 0)
2323                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2324
2325         err = dpcm_be_dai_shutdown(fe, stream);
2326         if (err < 0)
2327                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2328
2329         /* run the stream event for each BE */
2330         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2331
2332         return 0;
2333 }
2334
2335 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2336 {
2337         struct snd_pcm_substream *substream =
2338                 snd_soc_dpcm_get_substream(fe, stream);
2339         struct snd_soc_dpcm *dpcm;
2340         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2341         int ret;
2342
2343         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2344                         stream ? "capture" : "playback", fe->dai_link->name);
2345
2346         /* Only start the BE if the FE is ready */
2347         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2348                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2349                 return -EINVAL;
2350
2351         /* startup must always be called for new BEs */
2352         ret = dpcm_be_dai_startup(fe, stream);
2353         if (ret < 0)
2354                 goto disconnect;
2355
2356         /* keep going if FE state is > open */
2357         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2358                 return 0;
2359
2360         ret = dpcm_be_dai_hw_params(fe, stream);
2361         if (ret < 0)
2362                 goto close;
2363
2364         /* keep going if FE state is > hw_params */
2365         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2366                 return 0;
2367
2368
2369         ret = dpcm_be_dai_prepare(fe, stream);
2370         if (ret < 0)
2371                 goto hw_free;
2372
2373         /* run the stream event for each BE */
2374         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2375
2376         /* keep going if FE state is > prepare */
2377         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2378                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2379                 return 0;
2380
2381         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2382                 /* call trigger on the frontend - FE takes care of all BE triggers */
2383                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2384                                 fe->dai_link->name);
2385
2386                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2387                 if (ret < 0) {
2388                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2389                         goto hw_free;
2390                 }
2391         } else {
2392                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2393                         fe->dai_link->name);
2394
2395                 ret = dpcm_be_dai_trigger(fe, stream,
2396                                         SNDRV_PCM_TRIGGER_START);
2397                 if (ret < 0) {
2398                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2399                         goto hw_free;
2400                 }
2401         }
2402
2403         return 0;
2404
2405 hw_free:
2406         dpcm_be_dai_hw_free(fe, stream);
2407 close:
2408         dpcm_be_dai_shutdown(fe, stream);
2409 disconnect:
2410         /* disconnect any non started BEs */
2411         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2412                 struct snd_soc_pcm_runtime *be = dpcm->be;
2413                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2414                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2415         }
2416
2417         return ret;
2418 }
2419
2420 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2421 {
2422         int ret;
2423
2424         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2425         ret = dpcm_run_update_startup(fe, stream);
2426         if (ret < 0)
2427                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2428         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2429
2430         return ret;
2431 }
2432
2433 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2434 {
2435         int ret;
2436
2437         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2438         ret = dpcm_run_update_shutdown(fe, stream);
2439         if (ret < 0)
2440                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2441         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2442
2443         return ret;
2444 }
2445
2446 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2447  * any DAI links.
2448  */
2449 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2450 {
2451         struct snd_soc_pcm_runtime *fe;
2452         int old, new, paths;
2453
2454         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2455         list_for_each_entry(fe, &card->rtd_list, list) {
2456                 struct snd_soc_dapm_widget_list *list;
2457
2458                 /* make sure link is FE */
2459                 if (!fe->dai_link->dynamic)
2460                         continue;
2461
2462                 /* only check active links */
2463                 if (!fe->cpu_dai->active)
2464                         continue;
2465
2466                 /* DAPM sync will call this to update DSP paths */
2467                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2468                         fe->dai_link->name);
2469
2470                 /* skip if FE doesn't have playback capability */
2471                 if (!fe->cpu_dai->driver->playback.channels_min
2472                     || !fe->codec_dai->driver->playback.channels_min)
2473                         goto capture;
2474
2475                 /* skip if FE isn't currently playing */
2476                 if (!fe->cpu_dai->playback_active
2477                     || !fe->codec_dai->playback_active)
2478                         goto capture;
2479
2480                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2481                 if (paths < 0) {
2482                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2483                                         fe->dai_link->name,  "playback");
2484                         mutex_unlock(&card->mutex);
2485                         return paths;
2486                 }
2487
2488                 /* update any new playback paths */
2489                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2490                 if (new) {
2491                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2492                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2493                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2494                 }
2495
2496                 /* update any old playback paths */
2497                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2498                 if (old) {
2499                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2500                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2501                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2502                 }
2503
2504                 dpcm_path_put(&list);
2505 capture:
2506                 /* skip if FE doesn't have capture capability */
2507                 if (!fe->cpu_dai->driver->capture.channels_min
2508                     || !fe->codec_dai->driver->capture.channels_min)
2509                         continue;
2510
2511                 /* skip if FE isn't currently capturing */
2512                 if (!fe->cpu_dai->capture_active
2513                     || !fe->codec_dai->capture_active)
2514                         continue;
2515
2516                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2517                 if (paths < 0) {
2518                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2519                                         fe->dai_link->name,  "capture");
2520                         mutex_unlock(&card->mutex);
2521                         return paths;
2522                 }
2523
2524                 /* update any new capture paths */
2525                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2526                 if (new) {
2527                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2528                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2529                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2530                 }
2531
2532                 /* update any old capture paths */
2533                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2534                 if (old) {
2535                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2536                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2537                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2538                 }
2539
2540                 dpcm_path_put(&list);
2541         }
2542
2543         mutex_unlock(&card->mutex);
2544         return 0;
2545 }
2546 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2547 {
2548         struct snd_soc_dpcm *dpcm;
2549         struct list_head *clients =
2550                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2551
2552         list_for_each_entry(dpcm, clients, list_be) {
2553
2554                 struct snd_soc_pcm_runtime *be = dpcm->be;
2555                 int i;
2556
2557                 if (be->dai_link->ignore_suspend)
2558                         continue;
2559
2560                 for (i = 0; i < be->num_codecs; i++) {
2561                         struct snd_soc_dai *dai = be->codec_dais[i];
2562                         struct snd_soc_dai_driver *drv = dai->driver;
2563
2564                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2565                                          be->dai_link->name);
2566
2567                         if (drv->ops && drv->ops->digital_mute &&
2568                                                         dai->playback_active)
2569                                 drv->ops->digital_mute(dai, mute);
2570                 }
2571         }
2572
2573         return 0;
2574 }
2575
2576 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2577 {
2578         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2579         struct snd_soc_dpcm *dpcm;
2580         struct snd_soc_dapm_widget_list *list;
2581         int ret;
2582         int stream = fe_substream->stream;
2583
2584         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2585         fe->dpcm[stream].runtime = fe_substream->runtime;
2586
2587         ret = dpcm_path_get(fe, stream, &list);
2588         if (ret < 0) {
2589                 mutex_unlock(&fe->card->mutex);
2590                 return ret;
2591         } else if (ret == 0) {
2592                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2593                         fe->dai_link->name, stream ? "capture" : "playback");
2594         }
2595
2596         /* calculate valid and active FE <-> BE dpcms */
2597         dpcm_process_paths(fe, stream, &list, 1);
2598
2599         ret = dpcm_fe_dai_startup(fe_substream);
2600         if (ret < 0) {
2601                 /* clean up all links */
2602                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2603                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2604
2605                 dpcm_be_disconnect(fe, stream);
2606                 fe->dpcm[stream].runtime = NULL;
2607         }
2608
2609         dpcm_clear_pending_state(fe, stream);
2610         dpcm_path_put(&list);
2611         mutex_unlock(&fe->card->mutex);
2612         return ret;
2613 }
2614
2615 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2616 {
2617         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2618         struct snd_soc_dpcm *dpcm;
2619         int stream = fe_substream->stream, ret;
2620
2621         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2622         ret = dpcm_fe_dai_shutdown(fe_substream);
2623
2624         /* mark FE's links ready to prune */
2625         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2626                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2627
2628         dpcm_be_disconnect(fe, stream);
2629
2630         fe->dpcm[stream].runtime = NULL;
2631         mutex_unlock(&fe->card->mutex);
2632         return ret;
2633 }
2634
2635 /* create a new pcm */
2636 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2637 {
2638         struct snd_soc_platform *platform = rtd->platform;
2639         struct snd_soc_dai *codec_dai;
2640         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2641         struct snd_pcm *pcm;
2642         char new_name[64];
2643         int ret = 0, playback = 0, capture = 0;
2644         int i;
2645
2646         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2647                 playback = rtd->dai_link->dpcm_playback;
2648                 capture = rtd->dai_link->dpcm_capture;
2649         } else {
2650                 for (i = 0; i < rtd->num_codecs; i++) {
2651                         codec_dai = rtd->codec_dais[i];
2652                         if (codec_dai->driver->playback.channels_min)
2653                                 playback = 1;
2654                         if (codec_dai->driver->capture.channels_min)
2655                                 capture = 1;
2656                 }
2657
2658                 capture = capture && cpu_dai->driver->capture.channels_min;
2659                 playback = playback && cpu_dai->driver->playback.channels_min;
2660         }
2661
2662         if (rtd->dai_link->playback_only) {
2663                 playback = 1;
2664                 capture = 0;
2665         }
2666
2667         if (rtd->dai_link->capture_only) {
2668                 playback = 0;
2669                 capture = 1;
2670         }
2671
2672         /* create the PCM */
2673         if (rtd->dai_link->no_pcm) {
2674                 snprintf(new_name, sizeof(new_name), "(%s)",
2675                         rtd->dai_link->stream_name);
2676
2677                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2678                                 playback, capture, &pcm);
2679         } else {
2680                 if (rtd->dai_link->dynamic)
2681                         snprintf(new_name, sizeof(new_name), "%s (*)",
2682                                 rtd->dai_link->stream_name);
2683                 else
2684                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2685                                 rtd->dai_link->stream_name,
2686                                 (rtd->num_codecs > 1) ?
2687                                 "multicodec" : rtd->codec_dai->name, num);
2688
2689                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2690                         capture, &pcm);
2691         }
2692         if (ret < 0) {
2693                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2694                         rtd->dai_link->name);
2695                 return ret;
2696         }
2697         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2698
2699         /* DAPM dai link stream work */
2700         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2701
2702         pcm->nonatomic = rtd->dai_link->nonatomic;
2703         rtd->pcm = pcm;
2704         pcm->private_data = rtd;
2705
2706         if (rtd->dai_link->no_pcm) {
2707                 if (playback)
2708                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2709                 if (capture)
2710                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2711                 goto out;
2712         }
2713
2714         /* ASoC PCM operations */
2715         if (rtd->dai_link->dynamic) {
2716                 rtd->ops.open           = dpcm_fe_dai_open;
2717                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2718                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2719                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2720                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2721                 rtd->ops.close          = dpcm_fe_dai_close;
2722                 rtd->ops.pointer        = soc_pcm_pointer;
2723                 rtd->ops.ioctl          = soc_pcm_ioctl;
2724         } else {
2725                 rtd->ops.open           = soc_pcm_open;
2726                 rtd->ops.hw_params      = soc_pcm_hw_params;
2727                 rtd->ops.prepare        = soc_pcm_prepare;
2728                 rtd->ops.trigger        = soc_pcm_trigger;
2729                 rtd->ops.hw_free        = soc_pcm_hw_free;
2730                 rtd->ops.close          = soc_pcm_close;
2731                 rtd->ops.pointer        = soc_pcm_pointer;
2732                 rtd->ops.ioctl          = soc_pcm_ioctl;
2733         }
2734
2735         if (platform->driver->ops) {
2736                 rtd->ops.ack            = platform->driver->ops->ack;
2737                 rtd->ops.copy_user      = platform->driver->ops->copy_user;
2738                 rtd->ops.copy_kernel    = platform->driver->ops->copy_kernel;
2739                 rtd->ops.fill_silence   = platform->driver->ops->fill_silence;
2740                 rtd->ops.page           = platform->driver->ops->page;
2741                 rtd->ops.mmap           = platform->driver->ops->mmap;
2742         }
2743
2744         if (playback)
2745                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2746
2747         if (capture)
2748                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2749
2750         if (platform->driver->pcm_new) {
2751                 ret = platform->driver->pcm_new(rtd);
2752                 if (ret < 0) {
2753                         dev_err(platform->dev,
2754                                 "ASoC: pcm constructor failed: %d\n",
2755                                 ret);
2756                         return ret;
2757                 }
2758         }
2759
2760         pcm->private_free = platform->driver->pcm_free;
2761 out:
2762         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2763                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2764                  cpu_dai->name);
2765         return ret;
2766 }
2767
2768 /* is the current PCM operation for this FE ? */
2769 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2770 {
2771         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2772                 return 1;
2773         return 0;
2774 }
2775 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2776
2777 /* is the current PCM operation for this BE ? */
2778 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2779                 struct snd_soc_pcm_runtime *be, int stream)
2780 {
2781         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2782            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2783                   be->dpcm[stream].runtime_update))
2784                 return 1;
2785         return 0;
2786 }
2787 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2788
2789 /* get the substream for this BE */
2790 struct snd_pcm_substream *
2791         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2792 {
2793         return be->pcm->streams[stream].substream;
2794 }
2795 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2796
2797 /* get the BE runtime state */
2798 enum snd_soc_dpcm_state
2799         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2800 {
2801         return be->dpcm[stream].state;
2802 }
2803 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2804
2805 /* set the BE runtime state */
2806 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2807                 int stream, enum snd_soc_dpcm_state state)
2808 {
2809         be->dpcm[stream].state = state;
2810 }
2811 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2812
2813 /*
2814  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2815  * are not running, paused or suspended for the specified stream direction.
2816  */
2817 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2818                 struct snd_soc_pcm_runtime *be, int stream)
2819 {
2820         struct snd_soc_dpcm *dpcm;
2821         int state;
2822
2823         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2824
2825                 if (dpcm->fe == fe)
2826                         continue;
2827
2828                 state = dpcm->fe->dpcm[stream].state;
2829                 if (state == SND_SOC_DPCM_STATE_START ||
2830                         state == SND_SOC_DPCM_STATE_PAUSED ||
2831                         state == SND_SOC_DPCM_STATE_SUSPEND)
2832                         return 0;
2833         }
2834
2835         /* it's safe to free/stop this BE DAI */
2836         return 1;
2837 }
2838 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2839
2840 /*
2841  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2842  * running, paused or suspended for the specified stream direction.
2843  */
2844 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2845                 struct snd_soc_pcm_runtime *be, int stream)
2846 {
2847         struct snd_soc_dpcm *dpcm;
2848         int state;
2849
2850         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2851
2852                 if (dpcm->fe == fe)
2853                         continue;
2854
2855                 state = dpcm->fe->dpcm[stream].state;
2856                 if (state == SND_SOC_DPCM_STATE_START ||
2857                         state == SND_SOC_DPCM_STATE_PAUSED ||
2858                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2859                         state == SND_SOC_DPCM_STATE_PREPARE)
2860                         return 0;
2861         }
2862
2863         /* it's safe to change hw_params */
2864         return 1;
2865 }
2866 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2867
2868 #ifdef CONFIG_DEBUG_FS
2869 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2870 {
2871         switch (state) {
2872         case SND_SOC_DPCM_STATE_NEW:
2873                 return "new";
2874         case SND_SOC_DPCM_STATE_OPEN:
2875                 return "open";
2876         case SND_SOC_DPCM_STATE_HW_PARAMS:
2877                 return "hw_params";
2878         case SND_SOC_DPCM_STATE_PREPARE:
2879                 return "prepare";
2880         case SND_SOC_DPCM_STATE_START:
2881                 return "start";
2882         case SND_SOC_DPCM_STATE_STOP:
2883                 return "stop";
2884         case SND_SOC_DPCM_STATE_SUSPEND:
2885                 return "suspend";
2886         case SND_SOC_DPCM_STATE_PAUSED:
2887                 return "paused";
2888         case SND_SOC_DPCM_STATE_HW_FREE:
2889                 return "hw_free";
2890         case SND_SOC_DPCM_STATE_CLOSE:
2891                 return "close";
2892         }
2893
2894         return "unknown";
2895 }
2896
2897 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2898                                 int stream, char *buf, size_t size)
2899 {
2900         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2901         struct snd_soc_dpcm *dpcm;
2902         ssize_t offset = 0;
2903
2904         /* FE state */
2905         offset += snprintf(buf + offset, size - offset,
2906                         "[%s - %s]\n", fe->dai_link->name,
2907                         stream ? "Capture" : "Playback");
2908
2909         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2910                         dpcm_state_string(fe->dpcm[stream].state));
2911
2912         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2913             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2914                 offset += snprintf(buf + offset, size - offset,
2915                                 "Hardware Params: "
2916                                 "Format = %s, Channels = %d, Rate = %d\n",
2917                                 snd_pcm_format_name(params_format(params)),
2918                                 params_channels(params),
2919                                 params_rate(params));
2920
2921         /* BEs state */
2922         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2923
2924         if (list_empty(&fe->dpcm[stream].be_clients)) {
2925                 offset += snprintf(buf + offset, size - offset,
2926                                 " No active DSP links\n");
2927                 goto out;
2928         }
2929
2930         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2931                 struct snd_soc_pcm_runtime *be = dpcm->be;
2932                 params = &dpcm->hw_params;
2933
2934                 offset += snprintf(buf + offset, size - offset,
2935                                 "- %s\n", be->dai_link->name);
2936
2937                 offset += snprintf(buf + offset, size - offset,
2938                                 "   State: %s\n",
2939                                 dpcm_state_string(be->dpcm[stream].state));
2940
2941                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2942                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2943                         offset += snprintf(buf + offset, size - offset,
2944                                 "   Hardware Params: "
2945                                 "Format = %s, Channels = %d, Rate = %d\n",
2946                                 snd_pcm_format_name(params_format(params)),
2947                                 params_channels(params),
2948                                 params_rate(params));
2949         }
2950
2951 out:
2952         return offset;
2953 }
2954
2955 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2956                                 size_t count, loff_t *ppos)
2957 {
2958         struct snd_soc_pcm_runtime *fe = file->private_data;
2959         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2960         char *buf;
2961
2962         buf = kmalloc(out_count, GFP_KERNEL);
2963         if (!buf)
2964                 return -ENOMEM;
2965
2966         if (fe->cpu_dai->driver->playback.channels_min)
2967                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2968                                         buf + offset, out_count - offset);
2969
2970         if (fe->cpu_dai->driver->capture.channels_min)
2971                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2972                                         buf + offset, out_count - offset);
2973
2974         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2975
2976         kfree(buf);
2977         return ret;
2978 }
2979
2980 static const struct file_operations dpcm_state_fops = {
2981         .open = simple_open,
2982         .read = dpcm_state_read_file,
2983         .llseek = default_llseek,
2984 };
2985
2986 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2987 {
2988         if (!rtd->dai_link)
2989                 return;
2990
2991         if (!rtd->card->debugfs_card_root)
2992                 return;
2993
2994         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2995                         rtd->card->debugfs_card_root);
2996         if (!rtd->debugfs_dpcm_root) {
2997                 dev_dbg(rtd->dev,
2998                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2999                          rtd->dai_link->name);
3000                 return;
3001         }
3002
3003         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3004                                                 rtd->debugfs_dpcm_root,
3005                                                 rtd, &dpcm_state_fops);
3006 }
3007 #endif