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soc-pcm.c
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1 /*
2  * soc-pcm.c -- ALSA SoC PCM
3  *
4  * Copyright 2005 Wolfson Microelectronics PLC.
5  * Copyright 2005 Openedhand Ltd.
6  * Copyright (C) 2010 Slimlogic Ltd.
7  * Copyright (C) 2010 Texas Instruments Inc.
8  *
9  * Authors: Liam Girdwood <[email protected]>
10  * Mark Brown <[email protected]>
11  *
12  * This program is free software; you can redistribute it and/or modify it
13  * under the terms of the GNU General Public License as published by the
14  * Free Software Foundation; either version 2 of the License, or (at your
15  * option) any later version.
16  *
17  */
18 
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
24 #include <linux/workqueue.h>
25 #include <linux/export.h>
26 #include <linux/debugfs.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
31 #include <sound/soc-dpcm.h>
32 #include <sound/initval.h>
33 
34 #define DPCM_MAX_BE_USERS 8
35 
36 /* DPCM stream event, send event to FE and all active BEs. */
37 static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
38  int event)
39 {
40  struct snd_soc_dpcm *dpcm;
41 
42  list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
43 
44  struct snd_soc_pcm_runtime *be = dpcm->be;
45 
46  dev_dbg(be->dev, "pm: BE %s event %d dir %d\n",
47  be->dai_link->name, event, dir);
48 
49  snd_soc_dapm_stream_event(be, dir, event);
50  }
51 
52  snd_soc_dapm_stream_event(fe, dir, event);
53 
54  return 0;
55 }
56 
57 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
58  struct snd_soc_dai *soc_dai)
59 {
60  struct snd_soc_pcm_runtime *rtd = substream->private_data;
61  int ret;
62 
63  if (!soc_dai->driver->symmetric_rates &&
64  !rtd->dai_link->symmetric_rates)
65  return 0;
66 
67  /* This can happen if multiple streams are starting simultaneously -
68  * the second can need to get its constraints before the first has
69  * picked a rate. Complain and allow the application to carry on.
70  */
71  if (!soc_dai->rate) {
72  dev_warn(soc_dai->dev,
73  "Not enforcing symmetric_rates due to race\n");
74  return 0;
75  }
76 
77  dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);
78 
79  ret = snd_pcm_hw_constraint_minmax(substream->runtime,
80  SNDRV_PCM_HW_PARAM_RATE,
81  soc_dai->rate, soc_dai->rate);
82  if (ret < 0) {
83  dev_err(soc_dai->dev,
84  "Unable to apply rate symmetry constraint: %d\n", ret);
85  return ret;
86  }
87 
88  return 0;
89 }
90 
91 /*
92  * List of sample sizes that might go over the bus for parameter
93  * application. There ought to be a wildcard sample size for things
94  * like the DAC/ADC resolution to use but there isn't right now.
95  */
96 static int sample_sizes[] = {
97  24, 32,
98 };
99 
100 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
101  struct snd_soc_dai *dai)
102 {
103  int ret, i, bits;
104 
105  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
106  bits = dai->driver->playback.sig_bits;
107  else
108  bits = dai->driver->capture.sig_bits;
109 
110  if (!bits)
111  return;
112 
113  for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
114  if (bits >= sample_sizes[i])
115  continue;
116 
117  ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
118  sample_sizes[i], bits);
119  if (ret != 0)
120  dev_warn(dai->dev,
121  "Failed to set MSB %d/%d: %d\n",
122  bits, sample_sizes[i], ret);
123  }
124 }
125 
126 /*
127  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
128  * then initialized and any private data can be allocated. This also calls
129  * startup for the cpu DAI, platform, machine and codec DAI.
130  */
131 static int soc_pcm_open(struct snd_pcm_substream *substream)
132 {
133  struct snd_soc_pcm_runtime *rtd = substream->private_data;
134  struct snd_pcm_runtime *runtime = substream->runtime;
135  struct snd_soc_platform *platform = rtd->platform;
136  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
137  struct snd_soc_dai *codec_dai = rtd->codec_dai;
138  struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
139  struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
140  int ret = 0;
141 
142  pm_runtime_get_sync(cpu_dai->dev);
143  pm_runtime_get_sync(codec_dai->dev);
144  pm_runtime_get_sync(platform->dev);
145 
146  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
147 
148  /* startup the audio subsystem */
149  if (cpu_dai->driver->ops->startup) {
150  ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
151  if (ret < 0) {
152  dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
153  cpu_dai->name, ret);
154  goto out;
155  }
156  }
157 
158  if (platform->driver->ops && platform->driver->ops->open) {
159  ret = platform->driver->ops->open(substream);
160  if (ret < 0) {
161  dev_err(platform->dev, "can't open platform %s: %d\n",
162  platform->name, ret);
163  goto platform_err;
164  }
165  }
166 
167  if (codec_dai->driver->ops->startup) {
168  ret = codec_dai->driver->ops->startup(substream, codec_dai);
169  if (ret < 0) {
170  dev_err(codec_dai->dev, "can't open codec %s: %d\n",
171  codec_dai->name, ret);
172  goto codec_dai_err;
173  }
174  }
175 
176  if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
177  ret = rtd->dai_link->ops->startup(substream);
178  if (ret < 0) {
179  pr_err("asoc: %s startup failed: %d\n",
180  rtd->dai_link->name, ret);
181  goto machine_err;
182  }
183  }
184 
185  /* Dynamic PCM DAI links compat checks use dynamic capabilities */
186  if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
187  goto dynamic;
188 
189  /* Check that the codec and cpu DAIs are compatible */
190  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
191  runtime->hw.rate_min =
192  max(codec_dai_drv->playback.rate_min,
193  cpu_dai_drv->playback.rate_min);
194  runtime->hw.rate_max =
195  min(codec_dai_drv->playback.rate_max,
196  cpu_dai_drv->playback.rate_max);
197  runtime->hw.channels_min =
198  max(codec_dai_drv->playback.channels_min,
199  cpu_dai_drv->playback.channels_min);
200  runtime->hw.channels_max =
201  min(codec_dai_drv->playback.channels_max,
202  cpu_dai_drv->playback.channels_max);
203  runtime->hw.formats =
204  codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
205  runtime->hw.rates =
206  codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
207  if (codec_dai_drv->playback.rates
208  & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
209  runtime->hw.rates |= cpu_dai_drv->playback.rates;
210  if (cpu_dai_drv->playback.rates
211  & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
212  runtime->hw.rates |= codec_dai_drv->playback.rates;
213  } else {
214  runtime->hw.rate_min =
215  max(codec_dai_drv->capture.rate_min,
216  cpu_dai_drv->capture.rate_min);
217  runtime->hw.rate_max =
218  min(codec_dai_drv->capture.rate_max,
219  cpu_dai_drv->capture.rate_max);
220  runtime->hw.channels_min =
221  max(codec_dai_drv->capture.channels_min,
222  cpu_dai_drv->capture.channels_min);
223  runtime->hw.channels_max =
224  min(codec_dai_drv->capture.channels_max,
225  cpu_dai_drv->capture.channels_max);
226  runtime->hw.formats =
227  codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
228  runtime->hw.rates =
229  codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
230  if (codec_dai_drv->capture.rates
231  & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
232  runtime->hw.rates |= cpu_dai_drv->capture.rates;
233  if (cpu_dai_drv->capture.rates
234  & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
235  runtime->hw.rates |= codec_dai_drv->capture.rates;
236  }
237 
238  ret = -EINVAL;
239  snd_pcm_limit_hw_rates(runtime);
240  if (!runtime->hw.rates) {
241  printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
242  codec_dai->name, cpu_dai->name);
243  goto config_err;
244  }
245  if (!runtime->hw.formats) {
246  printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
247  codec_dai->name, cpu_dai->name);
248  goto config_err;
249  }
250  if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
251  runtime->hw.channels_min > runtime->hw.channels_max) {
252  printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
253  codec_dai->name, cpu_dai->name);
254  goto config_err;
255  }
256 
257  soc_pcm_apply_msb(substream, codec_dai);
258  soc_pcm_apply_msb(substream, cpu_dai);
259 
260  /* Symmetry only applies if we've already got an active stream. */
261  if (cpu_dai->active) {
262  ret = soc_pcm_apply_symmetry(substream, cpu_dai);
263  if (ret != 0)
264  goto config_err;
265  }
266 
267  if (codec_dai->active) {
268  ret = soc_pcm_apply_symmetry(substream, codec_dai);
269  if (ret != 0)
270  goto config_err;
271  }
272 
273  pr_debug("asoc: %s <-> %s info:\n",
274  codec_dai->name, cpu_dai->name);
275  pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
276  pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
277  runtime->hw.channels_max);
278  pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
279  runtime->hw.rate_max);
280 
281 dynamic:
282  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
283  cpu_dai->playback_active++;
284  codec_dai->playback_active++;
285  } else {
286  cpu_dai->capture_active++;
287  codec_dai->capture_active++;
288  }
289  cpu_dai->active++;
290  codec_dai->active++;
291  rtd->codec->active++;
292  mutex_unlock(&rtd->pcm_mutex);
293  return 0;
294 
295 config_err:
296  if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
297  rtd->dai_link->ops->shutdown(substream);
298 
299 machine_err:
300  if (codec_dai->driver->ops->shutdown)
301  codec_dai->driver->ops->shutdown(substream, codec_dai);
302 
303 codec_dai_err:
304  if (platform->driver->ops && platform->driver->ops->close)
305  platform->driver->ops->close(substream);
306 
307 platform_err:
308  if (cpu_dai->driver->ops->shutdown)
309  cpu_dai->driver->ops->shutdown(substream, cpu_dai);
310 out:
311  mutex_unlock(&rtd->pcm_mutex);
312 
313  pm_runtime_put(platform->dev);
314  pm_runtime_put(codec_dai->dev);
315  pm_runtime_put(cpu_dai->dev);
316 
317  return ret;
318 }
319 
320 /*
321  * Power down the audio subsystem pmdown_time msecs after close is called.
322  * This is to ensure there are no pops or clicks in between any music tracks
323  * due to DAPM power cycling.
324  */
325 static void close_delayed_work(struct work_struct *work)
326 {
327  struct snd_soc_pcm_runtime *rtd =
328  container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
329  struct snd_soc_dai *codec_dai = rtd->codec_dai;
330 
331  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
332 
333  pr_debug("pop wq checking: %s status: %s waiting: %s\n",
334  codec_dai->driver->playback.stream_name,
335  codec_dai->playback_active ? "active" : "inactive",
336  codec_dai->pop_wait ? "yes" : "no");
337 
338  /* are we waiting on this codec DAI stream */
339  if (codec_dai->pop_wait == 1) {
340  codec_dai->pop_wait = 0;
341  snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
342  SND_SOC_DAPM_STREAM_STOP);
343  }
344 
345  mutex_unlock(&rtd->pcm_mutex);
346 }
347 
348 /*
349  * Called by ALSA when a PCM substream is closed. Private data can be
350  * freed here. The cpu DAI, codec DAI, machine and platform are also
351  * shutdown.
352  */
353 static int soc_pcm_close(struct snd_pcm_substream *substream)
354 {
355  struct snd_soc_pcm_runtime *rtd = substream->private_data;
356  struct snd_soc_platform *platform = rtd->platform;
357  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
358  struct snd_soc_dai *codec_dai = rtd->codec_dai;
359  struct snd_soc_codec *codec = rtd->codec;
360 
361  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
362 
363  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
364  cpu_dai->playback_active--;
365  codec_dai->playback_active--;
366  } else {
367  cpu_dai->capture_active--;
368  codec_dai->capture_active--;
369  }
370 
371  cpu_dai->active--;
372  codec_dai->active--;
373  codec->active--;
374 
375  /* clear the corresponding DAIs rate when inactive */
376  if (!cpu_dai->active)
377  cpu_dai->rate = 0;
378 
379  if (!codec_dai->active)
380  codec_dai->rate = 0;
381 
382  /* Muting the DAC suppresses artifacts caused during digital
383  * shutdown, for example from stopping clocks.
384  */
385  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
386  snd_soc_dai_digital_mute(codec_dai, 1);
387 
388  if (cpu_dai->driver->ops->shutdown)
389  cpu_dai->driver->ops->shutdown(substream, cpu_dai);
390 
391  if (codec_dai->driver->ops->shutdown)
392  codec_dai->driver->ops->shutdown(substream, codec_dai);
393 
394  if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
395  rtd->dai_link->ops->shutdown(substream);
396 
397  if (platform->driver->ops && platform->driver->ops->close)
398  platform->driver->ops->close(substream);
399  cpu_dai->runtime = NULL;
400 
401  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
402  if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
403  rtd->dai_link->ignore_pmdown_time) {
404  /* powered down playback stream now */
405  snd_soc_dapm_stream_event(rtd,
406  SNDRV_PCM_STREAM_PLAYBACK,
407  SND_SOC_DAPM_STREAM_STOP);
408  } else {
409  /* start delayed pop wq here for playback streams */
410  codec_dai->pop_wait = 1;
411  schedule_delayed_work(&rtd->delayed_work,
412  msecs_to_jiffies(rtd->pmdown_time));
413  }
414  } else {
415  /* capture streams can be powered down now */
416  snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
417  SND_SOC_DAPM_STREAM_STOP);
418  }
419 
420  mutex_unlock(&rtd->pcm_mutex);
421 
422  pm_runtime_put(platform->dev);
423  pm_runtime_put(codec_dai->dev);
424  pm_runtime_put(cpu_dai->dev);
425 
426  return 0;
427 }
428 
429 /*
430  * Called by ALSA when the PCM substream is prepared, can set format, sample
431  * rate, etc. This function is non atomic and can be called multiple times,
432  * it can refer to the runtime info.
433  */
434 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
435 {
436  struct snd_soc_pcm_runtime *rtd = substream->private_data;
437  struct snd_soc_platform *platform = rtd->platform;
438  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
439  struct snd_soc_dai *codec_dai = rtd->codec_dai;
440  int ret = 0;
441 
442  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
443 
444  if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
445  ret = rtd->dai_link->ops->prepare(substream);
446  if (ret < 0) {
447  pr_err("asoc: machine prepare error: %d\n", ret);
448  goto out;
449  }
450  }
451 
452  if (platform->driver->ops && platform->driver->ops->prepare) {
453  ret = platform->driver->ops->prepare(substream);
454  if (ret < 0) {
455  dev_err(platform->dev, "platform prepare error: %d\n",
456  ret);
457  goto out;
458  }
459  }
460 
461  if (codec_dai->driver->ops->prepare) {
462  ret = codec_dai->driver->ops->prepare(substream, codec_dai);
463  if (ret < 0) {
464  dev_err(codec_dai->dev, "DAI prepare error: %d\n",
465  ret);
466  goto out;
467  }
468  }
469 
470  if (cpu_dai->driver->ops->prepare) {
471  ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
472  if (ret < 0) {
473  dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
474  ret);
475  goto out;
476  }
477  }
478 
479  /* cancel any delayed stream shutdown that is pending */
480  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
481  codec_dai->pop_wait) {
482  codec_dai->pop_wait = 0;
483  cancel_delayed_work(&rtd->delayed_work);
484  }
485 
486  snd_soc_dapm_stream_event(rtd, substream->stream,
487  SND_SOC_DAPM_STREAM_START);
488 
489  snd_soc_dai_digital_mute(codec_dai, 0);
490 
491 out:
492  mutex_unlock(&rtd->pcm_mutex);
493  return ret;
494 }
495 
496 /*
497  * Called by ALSA when the hardware params are set by application. This
498  * function can also be called multiple times and can allocate buffers
499  * (using snd_pcm_lib_* ). It's non-atomic.
500  */
501 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
502  struct snd_pcm_hw_params *params)
503 {
504  struct snd_soc_pcm_runtime *rtd = substream->private_data;
505  struct snd_soc_platform *platform = rtd->platform;
506  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
507  struct snd_soc_dai *codec_dai = rtd->codec_dai;
508  int ret = 0;
509 
510  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
511 
512  if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
513  ret = rtd->dai_link->ops->hw_params(substream, params);
514  if (ret < 0) {
515  pr_err("asoc: machine hw_params failed: %d\n", ret);
516  goto out;
517  }
518  }
519 
520  if (codec_dai->driver->ops->hw_params) {
521  ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
522  if (ret < 0) {
523  dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
524  codec_dai->name, ret);
525  goto codec_err;
526  }
527  }
528 
529  if (cpu_dai->driver->ops->hw_params) {
530  ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
531  if (ret < 0) {
532  dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
533  cpu_dai->name, ret);
534  goto interface_err;
535  }
536  }
537 
538  if (platform->driver->ops && platform->driver->ops->hw_params) {
539  ret = platform->driver->ops->hw_params(substream, params);
540  if (ret < 0) {
541  dev_err(platform->dev, "%s hw params failed: %d\n",
542  platform->name, ret);
543  goto platform_err;
544  }
545  }
546 
547  /* store the rate for each DAIs */
548  cpu_dai->rate = params_rate(params);
549  codec_dai->rate = params_rate(params);
550 
551 out:
552  mutex_unlock(&rtd->pcm_mutex);
553  return ret;
554 
555 platform_err:
556  if (cpu_dai->driver->ops->hw_free)
557  cpu_dai->driver->ops->hw_free(substream, cpu_dai);
558 
559 interface_err:
560  if (codec_dai->driver->ops->hw_free)
561  codec_dai->driver->ops->hw_free(substream, codec_dai);
562 
563 codec_err:
564  if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
565  rtd->dai_link->ops->hw_free(substream);
566 
567  mutex_unlock(&rtd->pcm_mutex);
568  return ret;
569 }
570 
571 /*
572  * Frees resources allocated by hw_params, can be called multiple times
573  */
574 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
575 {
576  struct snd_soc_pcm_runtime *rtd = substream->private_data;
577  struct snd_soc_platform *platform = rtd->platform;
578  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
579  struct snd_soc_dai *codec_dai = rtd->codec_dai;
580  struct snd_soc_codec *codec = rtd->codec;
581 
582  mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
583 
584  /* apply codec digital mute */
585  if (!codec->active)
586  snd_soc_dai_digital_mute(codec_dai, 1);
587 
588  /* free any machine hw params */
589  if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
590  rtd->dai_link->ops->hw_free(substream);
591 
592  /* free any DMA resources */
593  if (platform->driver->ops && platform->driver->ops->hw_free)
594  platform->driver->ops->hw_free(substream);
595 
596  /* now free hw params for the DAIs */
597  if (codec_dai->driver->ops->hw_free)
598  codec_dai->driver->ops->hw_free(substream, codec_dai);
599 
600  if (cpu_dai->driver->ops->hw_free)
601  cpu_dai->driver->ops->hw_free(substream, cpu_dai);
602 
603  mutex_unlock(&rtd->pcm_mutex);
604  return 0;
605 }
606 
607 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
608 {
609  struct snd_soc_pcm_runtime *rtd = substream->private_data;
610  struct snd_soc_platform *platform = rtd->platform;
611  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
612  struct snd_soc_dai *codec_dai = rtd->codec_dai;
613  int ret;
614 
615  if (codec_dai->driver->ops->trigger) {
616  ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
617  if (ret < 0)
618  return ret;
619  }
620 
621  if (platform->driver->ops && platform->driver->ops->trigger) {
622  ret = platform->driver->ops->trigger(substream, cmd);
623  if (ret < 0)
624  return ret;
625  }
626 
627  if (cpu_dai->driver->ops->trigger) {
628  ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
629  if (ret < 0)
630  return ret;
631  }
632  return 0;
633 }
634 
635 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
636  int cmd)
637 {
638  struct snd_soc_pcm_runtime *rtd = substream->private_data;
639  struct snd_soc_platform *platform = rtd->platform;
640  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
641  struct snd_soc_dai *codec_dai = rtd->codec_dai;
642  int ret;
643 
644  if (codec_dai->driver->ops->bespoke_trigger) {
645  ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
646  if (ret < 0)
647  return ret;
648  }
649 
650  if (platform->driver->bespoke_trigger) {
651  ret = platform->driver->bespoke_trigger(substream, cmd);
652  if (ret < 0)
653  return ret;
654  }
655 
656  if (cpu_dai->driver->ops->bespoke_trigger) {
657  ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
658  if (ret < 0)
659  return ret;
660  }
661  return 0;
662 }
663 /*
664  * soc level wrapper for pointer callback
665  * If cpu_dai, codec_dai, platform driver has the delay callback, than
666  * the runtime->delay will be updated accordingly.
667  */
668 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
669 {
670  struct snd_soc_pcm_runtime *rtd = substream->private_data;
671  struct snd_soc_platform *platform = rtd->platform;
672  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
673  struct snd_soc_dai *codec_dai = rtd->codec_dai;
674  struct snd_pcm_runtime *runtime = substream->runtime;
675  snd_pcm_uframes_t offset = 0;
676  snd_pcm_sframes_t delay = 0;
677 
678  if (platform->driver->ops && platform->driver->ops->pointer)
679  offset = platform->driver->ops->pointer(substream);
680 
681  if (cpu_dai->driver->ops->delay)
682  delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
683 
684  if (codec_dai->driver->ops->delay)
685  delay += codec_dai->driver->ops->delay(substream, codec_dai);
686 
687  if (platform->driver->delay)
688  delay += platform->driver->delay(substream, codec_dai);
689 
690  runtime->delay = delay;
691 
692  return offset;
693 }
694 
695 /* connect a FE and BE */
696 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
697  struct snd_soc_pcm_runtime *be, int stream)
698 {
699  struct snd_soc_dpcm *dpcm;
700 
701  /* only add new dpcms */
702  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
703  if (dpcm->be == be && dpcm->fe == fe)
704  return 0;
705  }
706 
707  dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
708  if (!dpcm)
709  return -ENOMEM;
710 
711  dpcm->be = be;
712  dpcm->fe = fe;
713  be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
714  dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
715  list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
716  list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
717 
718  dev_dbg(fe->dev, " connected new DPCM %s path %s %s %s\n",
719  stream ? "capture" : "playback", fe->dai_link->name,
720  stream ? "<-" : "->", be->dai_link->name);
721 
722 #ifdef CONFIG_DEBUG_FS
723  dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
724  fe->debugfs_dpcm_root, &dpcm->state);
725 #endif
726  return 1;
727 }
728 
729 /* reparent a BE onto another FE */
730 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
731  struct snd_soc_pcm_runtime *be, int stream)
732 {
733  struct snd_soc_dpcm *dpcm;
734  struct snd_pcm_substream *fe_substream, *be_substream;
735 
736  /* reparent if BE is connected to other FEs */
737  if (!be->dpcm[stream].users)
738  return;
739 
740  be_substream = snd_soc_dpcm_get_substream(be, stream);
741 
742  list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
743  if (dpcm->fe == fe)
744  continue;
745 
746  dev_dbg(fe->dev, " reparent %s path %s %s %s\n",
747  stream ? "capture" : "playback",
748  dpcm->fe->dai_link->name,
749  stream ? "<-" : "->", dpcm->be->dai_link->name);
750 
751  fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
752  be_substream->runtime = fe_substream->runtime;
753  break;
754  }
755 }
756 
757 /* disconnect a BE and FE */
758 static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
759 {
760  struct snd_soc_dpcm *dpcm, *d;
761 
762  list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
763  dev_dbg(fe->dev, "BE %s disconnect check for %s\n",
764  stream ? "capture" : "playback",
765  dpcm->be->dai_link->name);
766 
767  if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
768  continue;
769 
770  dev_dbg(fe->dev, " freed DSP %s path %s %s %s\n",
771  stream ? "capture" : "playback", fe->dai_link->name,
772  stream ? "<-" : "->", dpcm->be->dai_link->name);
773 
774  /* BEs still alive need new FE */
775  dpcm_be_reparent(fe, dpcm->be, stream);
776 
777 #ifdef CONFIG_DEBUG_FS
778  debugfs_remove(dpcm->debugfs_state);
779 #endif
780  list_del(&dpcm->list_be);
781  list_del(&dpcm->list_fe);
782  kfree(dpcm);
783  }
784 }
785 
786 /* get BE for DAI widget and stream */
787 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
788  struct snd_soc_dapm_widget *widget, int stream)
789 {
790  struct snd_soc_pcm_runtime *be;
791  int i;
792 
793  if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
794  for (i = 0; i < card->num_links; i++) {
795  be = &card->rtd[i];
796 
797  if (!be->dai_link->no_pcm)
798  continue;
799 
800  if (be->cpu_dai->playback_widget == widget ||
801  be->codec_dai->playback_widget == widget)
802  return be;
803  }
804  } else {
805 
806  for (i = 0; i < card->num_links; i++) {
807  be = &card->rtd[i];
808 
809  if (!be->dai_link->no_pcm)
810  continue;
811 
812  if (be->cpu_dai->capture_widget == widget ||
813  be->codec_dai->capture_widget == widget)
814  return be;
815  }
816  }
817 
818  dev_err(card->dev, "can't get %s BE for %s\n",
819  stream ? "capture" : "playback", widget->name);
820  return NULL;
821 }
822 
823 static inline struct snd_soc_dapm_widget *
824  rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
825 {
826  if (stream == SNDRV_PCM_STREAM_PLAYBACK)
827  return rtd->cpu_dai->playback_widget;
828  else
829  return rtd->cpu_dai->capture_widget;
830 }
831 
832 static inline struct snd_soc_dapm_widget *
833  rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
834 {
835  if (stream == SNDRV_PCM_STREAM_PLAYBACK)
836  return rtd->codec_dai->playback_widget;
837  else
838  return rtd->codec_dai->capture_widget;
839 }
840 
841 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
842  struct snd_soc_dapm_widget *widget)
843 {
844  int i;
845 
846  for (i = 0; i < list->num_widgets; i++) {
847  if (widget == list->widgets[i])
848  return 1;
849  }
850 
851  return 0;
852 }
853 
854 static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
855  int stream, struct snd_soc_dapm_widget_list **list_)
856 {
857  struct snd_soc_dai *cpu_dai = fe->cpu_dai;
858  struct snd_soc_dapm_widget_list *list;
859  int paths;
860 
861  list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
862  sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
863  if (list == NULL)
864  return -ENOMEM;
865 
866  /* get number of valid DAI paths and their widgets */
867  paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
868 
869  dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
870  stream ? "capture" : "playback");
871 
872  *list_ = list;
873  return paths;
874 }
875 
876 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
877 {
878  kfree(*list);
879 }
880 
881 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
882  struct snd_soc_dapm_widget_list **list_)
883 {
884  struct snd_soc_dpcm *dpcm;
885  struct snd_soc_dapm_widget_list *list = *list_;
886  struct snd_soc_dapm_widget *widget;
887  int prune = 0;
888 
889  /* Destroy any old FE <--> BE connections */
890  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
891 
892  /* is there a valid CPU DAI widget for this BE */
893  widget = rtd_get_cpu_widget(dpcm->be, stream);
894 
895  /* prune the BE if it's no longer in our active list */
896  if (widget && widget_in_list(list, widget))
897  continue;
898 
899  /* is there a valid CODEC DAI widget for this BE */
900  widget = rtd_get_codec_widget(dpcm->be, stream);
901 
902  /* prune the BE if it's no longer in our active list */
903  if (widget && widget_in_list(list, widget))
904  continue;
905 
906  dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
907  stream ? "capture" : "playback",
908  dpcm->be->dai_link->name, fe->dai_link->name);
909  dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
910  dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
911  prune++;
912  }
913 
914  dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
915  return prune;
916 }
917 
918 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
919  struct snd_soc_dapm_widget_list **list_)
920 {
921  struct snd_soc_card *card = fe->card;
922  struct snd_soc_dapm_widget_list *list = *list_;
923  struct snd_soc_pcm_runtime *be;
924  int i, new = 0, err;
925 
926  /* Create any new FE <--> BE connections */
927  for (i = 0; i < list->num_widgets; i++) {
928 
929  if (list->widgets[i]->id != snd_soc_dapm_dai)
930  continue;
931 
932  /* is there a valid BE rtd for this widget */
933  be = dpcm_get_be(card, list->widgets[i], stream);
934  if (!be) {
935  dev_err(fe->dev, "no BE found for %s\n",
936  list->widgets[i]->name);
937  continue;
938  }
939 
940  /* make sure BE is a real BE */
941  if (!be->dai_link->no_pcm)
942  continue;
943 
944  /* don't connect if FE is not running */
945  if (!fe->dpcm[stream].runtime)
946  continue;
947 
948  /* newly connected FE and BE */
949  err = dpcm_be_connect(fe, be, stream);
950  if (err < 0) {
951  dev_err(fe->dev, "can't connect %s\n",
952  list->widgets[i]->name);
953  break;
954  } else if (err == 0) /* already connected */
955  continue;
956 
957  /* new */
958  be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
959  new++;
960  }
961 
962  dev_dbg(fe->dev, "found %d new BE paths\n", new);
963  return new;
964 }
965 
966 /*
967  * Find the corresponding BE DAIs that source or sink audio to this
968  * FE substream.
969  */
970 static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
971  int stream, struct snd_soc_dapm_widget_list **list, int new)
972 {
973  if (new)
974  return dpcm_add_paths(fe, stream, list);
975  else
976  return dpcm_prune_paths(fe, stream, list);
977 }
978 
979 static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
980 {
981  struct snd_soc_dpcm *dpcm;
982 
983  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
984  dpcm->be->dpcm[stream].runtime_update =
985  SND_SOC_DPCM_UPDATE_NO;
986 }
987 
988 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
989  int stream)
990 {
991  struct snd_soc_dpcm *dpcm;
992 
993  /* disable any enabled and non active backends */
994  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
995 
996  struct snd_soc_pcm_runtime *be = dpcm->be;
997  struct snd_pcm_substream *be_substream =
998  snd_soc_dpcm_get_substream(be, stream);
999 
1000  if (be->dpcm[stream].users == 0)
1001  dev_err(be->dev, "no users %s at close - state %d\n",
1002  stream ? "capture" : "playback",
1003  be->dpcm[stream].state);
1004 
1005  if (--be->dpcm[stream].users != 0)
1006  continue;
1007 
1008  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1009  continue;
1010 
1011  soc_pcm_close(be_substream);
1012  be_substream->runtime = NULL;
1013  be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1014  }
1015 }
1016 
1017 static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1018 {
1019  struct snd_soc_dpcm *dpcm;
1020  int err, count = 0;
1021 
1022  /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1023  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1024 
1025  struct snd_soc_pcm_runtime *be = dpcm->be;
1026  struct snd_pcm_substream *be_substream =
1027  snd_soc_dpcm_get_substream(be, stream);
1028 
1029  /* is this op for this BE ? */
1030  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1031  continue;
1032 
1033  /* first time the dpcm is open ? */
1034  if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1035  dev_err(be->dev, "too many users %s at open %d\n",
1036  stream ? "capture" : "playback",
1037  be->dpcm[stream].state);
1038 
1039  if (be->dpcm[stream].users++ != 0)
1040  continue;
1041 
1042  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1043  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1044  continue;
1045 
1046  dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);
1047 
1048  be_substream->runtime = be->dpcm[stream].runtime;
1049  err = soc_pcm_open(be_substream);
1050  if (err < 0) {
1051  dev_err(be->dev, "BE open failed %d\n", err);
1052  be->dpcm[stream].users--;
1053  if (be->dpcm[stream].users < 0)
1054  dev_err(be->dev, "no users %s at unwind %d\n",
1055  stream ? "capture" : "playback",
1056  be->dpcm[stream].state);
1057 
1058  be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1059  goto unwind;
1060  }
1061 
1062  be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1063  count++;
1064  }
1065 
1066  return count;
1067 
1068 unwind:
1069  /* disable any enabled and non active backends */
1070  list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1071  struct snd_soc_pcm_runtime *be = dpcm->be;
1072  struct snd_pcm_substream *be_substream =
1073  snd_soc_dpcm_get_substream(be, stream);
1074 
1075  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1076  continue;
1077 
1078  if (be->dpcm[stream].users == 0)
1079  dev_err(be->dev, "no users %s at close %d\n",
1080  stream ? "capture" : "playback",
1081  be->dpcm[stream].state);
1082 
1083  if (--be->dpcm[stream].users != 0)
1084  continue;
1085 
1086  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1087  continue;
1088 
1089  soc_pcm_close(be_substream);
1090  be_substream->runtime = NULL;
1091  be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1092  }
1093 
1094  return err;
1095 }
1096 
1097 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1098 {
1099  struct snd_pcm_runtime *runtime = substream->runtime;
1100  struct snd_soc_pcm_runtime *rtd = substream->private_data;
1101  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1102  struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1103 
1104  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1105  runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
1106  runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
1107  runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
1108  runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
1109  runtime->hw.formats &= cpu_dai_drv->playback.formats;
1110  runtime->hw.rates = cpu_dai_drv->playback.rates;
1111  } else {
1112  runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
1113  runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
1114  runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
1115  runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
1116  runtime->hw.formats &= cpu_dai_drv->capture.formats;
1117  runtime->hw.rates = cpu_dai_drv->capture.rates;
1118  }
1119 }
1120 
1121 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1122 {
1123  struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1124  struct snd_pcm_runtime *runtime = fe_substream->runtime;
1125  int stream = fe_substream->stream, ret = 0;
1126 
1127  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1128 
1129  ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1130  if (ret < 0) {
1131  dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
1132  goto be_err;
1133  }
1134 
1135  dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
1136 
1137  /* start the DAI frontend */
1138  ret = soc_pcm_open(fe_substream);
1139  if (ret < 0) {
1140  dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
1141  goto unwind;
1142  }
1143 
1144  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1145 
1146  dpcm_set_fe_runtime(fe_substream);
1147  snd_pcm_limit_hw_rates(runtime);
1148 
1149  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1150  return 0;
1151 
1152 unwind:
1153  dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1154 be_err:
1155  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1156  return ret;
1157 }
1158 
1159 static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1160 {
1161  struct snd_soc_dpcm *dpcm;
1162 
1163  /* only shutdown BEs that are either sinks or sources to this FE DAI */
1164  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1165 
1166  struct snd_soc_pcm_runtime *be = dpcm->be;
1167  struct snd_pcm_substream *be_substream =
1168  snd_soc_dpcm_get_substream(be, stream);
1169 
1170  /* is this op for this BE ? */
1171  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1172  continue;
1173 
1174  if (be->dpcm[stream].users == 0)
1175  dev_err(be->dev, "no users %s at close - state %d\n",
1176  stream ? "capture" : "playback",
1177  be->dpcm[stream].state);
1178 
1179  if (--be->dpcm[stream].users != 0)
1180  continue;
1181 
1182  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1183  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1184  continue;
1185 
1186  dev_dbg(be->dev, "dpcm: close BE %s\n",
1187  dpcm->fe->dai_link->name);
1188 
1189  soc_pcm_close(be_substream);
1190  be_substream->runtime = NULL;
1191 
1192  be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1193  }
1194  return 0;
1195 }
1196 
1197 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1198 {
1199  struct snd_soc_pcm_runtime *fe = substream->private_data;
1200  int stream = substream->stream;
1201 
1202  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1203 
1204  /* shutdown the BEs */
1205  dpcm_be_dai_shutdown(fe, substream->stream);
1206 
1207  dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
1208 
1209  /* now shutdown the frontend */
1210  soc_pcm_close(substream);
1211 
1212  /* run the stream event for each BE */
1213  dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1214 
1215  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1216  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1217  return 0;
1218 }
1219 
1220 static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1221 {
1222  struct snd_soc_dpcm *dpcm;
1223 
1224  /* only hw_params backends that are either sinks or sources
1225  * to this frontend DAI */
1226  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1227 
1228  struct snd_soc_pcm_runtime *be = dpcm->be;
1229  struct snd_pcm_substream *be_substream =
1230  snd_soc_dpcm_get_substream(be, stream);
1231 
1232  /* is this op for this BE ? */
1233  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1234  continue;
1235 
1236  /* only free hw when no longer used - check all FEs */
1237  if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1238  continue;
1239 
1240  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1241  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1242  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1243  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1244  continue;
1245 
1246  dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
1247  dpcm->fe->dai_link->name);
1248 
1249  soc_pcm_hw_free(be_substream);
1250 
1251  be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1252  }
1253 
1254  return 0;
1255 }
1256 
1257 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1258 {
1259  struct snd_soc_pcm_runtime *fe = substream->private_data;
1260  int err, stream = substream->stream;
1261 
1262  mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1263  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1264 
1265  dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
1266 
1267  /* call hw_free on the frontend */
1268  err = soc_pcm_hw_free(substream);
1269  if (err < 0)
1270  dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
1271  fe->dai_link->name);
1272 
1273  /* only hw_params backends that are either sinks or sources
1274  * to this frontend DAI */
1275  err = dpcm_be_dai_hw_free(fe, stream);
1276 
1277  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1278  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1279 
1280  mutex_unlock(&fe->card->mutex);
1281  return 0;
1282 }
1283 
1284 static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1285 {
1286  struct snd_soc_dpcm *dpcm;
1287  int ret;
1288 
1289  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1290 
1291  struct snd_soc_pcm_runtime *be = dpcm->be;
1292  struct snd_pcm_substream *be_substream =
1293  snd_soc_dpcm_get_substream(be, stream);
1294 
1295  /* is this op for this BE ? */
1296  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1297  continue;
1298 
1299  /* only allow hw_params() if no connected FEs are running */
1300  if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1301  continue;
1302 
1303  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1304  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1305  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1306  continue;
1307 
1308  dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
1309  dpcm->fe->dai_link->name);
1310 
1311  /* copy params for each dpcm */
1312  memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1313  sizeof(struct snd_pcm_hw_params));
1314 
1315  /* perform any hw_params fixups */
1316  if (be->dai_link->be_hw_params_fixup) {
1317  ret = be->dai_link->be_hw_params_fixup(be,
1318  &dpcm->hw_params);
1319  if (ret < 0) {
1320  dev_err(be->dev,
1321  "dpcm: hw_params BE fixup failed %d\n",
1322  ret);
1323  goto unwind;
1324  }
1325  }
1326 
1327  ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1328  if (ret < 0) {
1329  dev_err(dpcm->be->dev,
1330  "dpcm: hw_params BE failed %d\n", ret);
1331  goto unwind;
1332  }
1333 
1334  be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1335  }
1336  return 0;
1337 
1338 unwind:
1339  /* disable any enabled and non active backends */
1340  list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1341  struct snd_soc_pcm_runtime *be = dpcm->be;
1342  struct snd_pcm_substream *be_substream =
1343  snd_soc_dpcm_get_substream(be, stream);
1344 
1345  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1346  continue;
1347 
1348  /* only allow hw_free() if no connected FEs are running */
1349  if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1350  continue;
1351 
1352  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1353  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1354  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1355  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1356  continue;
1357 
1358  soc_pcm_hw_free(be_substream);
1359  }
1360 
1361  return ret;
1362 }
1363 
1364 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1365  struct snd_pcm_hw_params *params)
1366 {
1367  struct snd_soc_pcm_runtime *fe = substream->private_data;
1368  int ret, stream = substream->stream;
1369 
1370  mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1371  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1372 
1373  memcpy(&fe->dpcm[substream->stream].hw_params, params,
1374  sizeof(struct snd_pcm_hw_params));
1375  ret = dpcm_be_dai_hw_params(fe, substream->stream);
1376  if (ret < 0) {
1377  dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
1378  goto out;
1379  }
1380 
1381  dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
1382  fe->dai_link->name, params_rate(params),
1383  params_channels(params), params_format(params));
1384 
1385  /* call hw_params on the frontend */
1386  ret = soc_pcm_hw_params(substream, params);
1387  if (ret < 0) {
1388  dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
1389  dpcm_be_dai_hw_free(fe, stream);
1390  } else
1391  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1392 
1393 out:
1394  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1395  mutex_unlock(&fe->card->mutex);
1396  return ret;
1397 }
1398 
1399 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1400  struct snd_pcm_substream *substream, int cmd)
1401 {
1402  int ret;
1403 
1404  dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
1405  dpcm->fe->dai_link->name, cmd);
1406 
1407  ret = soc_pcm_trigger(substream, cmd);
1408  if (ret < 0)
1409  dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
1410 
1411  return ret;
1412 }
1413 
1414 static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1415  int cmd)
1416 {
1417  struct snd_soc_dpcm *dpcm;
1418  int ret = 0;
1419 
1420  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1421 
1422  struct snd_soc_pcm_runtime *be = dpcm->be;
1423  struct snd_pcm_substream *be_substream =
1424  snd_soc_dpcm_get_substream(be, stream);
1425 
1426  /* is this op for this BE ? */
1427  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1428  continue;
1429 
1430  switch (cmd) {
1431  case SNDRV_PCM_TRIGGER_START:
1432  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1433  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1434  continue;
1435 
1436  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1437  if (ret)
1438  return ret;
1439 
1440  be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1441  break;
1442  case SNDRV_PCM_TRIGGER_RESUME:
1443  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1444  continue;
1445 
1446  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1447  if (ret)
1448  return ret;
1449 
1450  be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1451  break;
1452  case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1453  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1454  continue;
1455 
1456  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1457  if (ret)
1458  return ret;
1459 
1460  be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1461  break;
1462  case SNDRV_PCM_TRIGGER_STOP:
1463  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1464  continue;
1465 
1466  if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1467  continue;
1468 
1469  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1470  if (ret)
1471  return ret;
1472 
1473  be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1474  break;
1475  case SNDRV_PCM_TRIGGER_SUSPEND:
1476  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
1477  continue;
1478 
1479  if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1480  continue;
1481 
1482  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1483  if (ret)
1484  return ret;
1485 
1486  be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1487  break;
1488  case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1489  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1490  continue;
1491 
1492  if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1493  continue;
1494 
1495  ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1496  if (ret)
1497  return ret;
1498 
1499  be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1500  break;
1501  }
1502  }
1503 
1504  return ret;
1505 }
1506 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1507 
1508 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1509 {
1510  struct snd_soc_pcm_runtime *fe = substream->private_data;
1511  int stream = substream->stream, ret;
1512  enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1513 
1514  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1515 
1516  switch (trigger) {
1517  case SND_SOC_DPCM_TRIGGER_PRE:
1518  /* call trigger on the frontend before the backend. */
1519 
1520  dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
1521  fe->dai_link->name, cmd);
1522 
1523  ret = soc_pcm_trigger(substream, cmd);
1524  if (ret < 0) {
1525  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1526  goto out;
1527  }
1528 
1529  ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1530  break;
1531  case SND_SOC_DPCM_TRIGGER_POST:
1532  /* call trigger on the frontend after the backend. */
1533 
1534  ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1535  if (ret < 0) {
1536  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1537  goto out;
1538  }
1539 
1540  dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
1541  fe->dai_link->name, cmd);
1542 
1543  ret = soc_pcm_trigger(substream, cmd);
1544  break;
1545  case SND_SOC_DPCM_TRIGGER_BESPOKE:
1546  /* bespoke trigger() - handles both FE and BEs */
1547 
1548  dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
1549  fe->dai_link->name, cmd);
1550 
1551  ret = soc_pcm_bespoke_trigger(substream, cmd);
1552  if (ret < 0) {
1553  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1554  goto out;
1555  }
1556  break;
1557  default:
1558  dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
1559  fe->dai_link->name);
1560  ret = -EINVAL;
1561  goto out;
1562  }
1563 
1564  switch (cmd) {
1565  case SNDRV_PCM_TRIGGER_START:
1566  case SNDRV_PCM_TRIGGER_RESUME:
1567  case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1568  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1569  break;
1570  case SNDRV_PCM_TRIGGER_STOP:
1571  case SNDRV_PCM_TRIGGER_SUSPEND:
1572  case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1573  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1574  break;
1575  }
1576 
1577 out:
1578  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1579  return ret;
1580 }
1581 
1582 static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
1583 {
1584  struct snd_soc_dpcm *dpcm;
1585  int ret = 0;
1586 
1587  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1588 
1589  struct snd_soc_pcm_runtime *be = dpcm->be;
1590  struct snd_pcm_substream *be_substream =
1591  snd_soc_dpcm_get_substream(be, stream);
1592 
1593  /* is this op for this BE ? */
1594  if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1595  continue;
1596 
1597  if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1598  (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1599  continue;
1600 
1601  dev_dbg(be->dev, "dpcm: prepare BE %s\n",
1602  dpcm->fe->dai_link->name);
1603 
1604  ret = soc_pcm_prepare(be_substream);
1605  if (ret < 0) {
1606  dev_err(be->dev, "dpcm: backend prepare failed %d\n",
1607  ret);
1608  break;
1609  }
1610 
1611  be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1612  }
1613  return ret;
1614 }
1615 
1616 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1617 {
1618  struct snd_soc_pcm_runtime *fe = substream->private_data;
1619  int stream = substream->stream, ret = 0;
1620 
1621  mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1622 
1623  dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
1624 
1625  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1626 
1627  /* there is no point preparing this FE if there are no BEs */
1628  if (list_empty(&fe->dpcm[stream].be_clients)) {
1629  dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
1630  fe->dai_link->name);
1631  ret = -EINVAL;
1632  goto out;
1633  }
1634 
1635  ret = dpcm_be_dai_prepare(fe, substream->stream);
1636  if (ret < 0)
1637  goto out;
1638 
1639  /* call prepare on the frontend */
1640  ret = soc_pcm_prepare(substream);
1641  if (ret < 0) {
1642  dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
1643  fe->dai_link->name);
1644  goto out;
1645  }
1646 
1647  /* run the stream event for each BE */
1648  dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
1649  fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
1650 
1651 out:
1652  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1653  mutex_unlock(&fe->card->mutex);
1654 
1655  return ret;
1656 }
1657 
1658 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
1659  unsigned int cmd, void *arg)
1660 {
1661  struct snd_soc_pcm_runtime *rtd = substream->private_data;
1662  struct snd_soc_platform *platform = rtd->platform;
1663 
1664  if (platform->driver->ops->ioctl)
1665  return platform->driver->ops->ioctl(substream, cmd, arg);
1666  return snd_pcm_lib_ioctl(substream, cmd, arg);
1667 }
1668 
1669 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1670 {
1671  struct snd_pcm_substream *substream =
1672  snd_soc_dpcm_get_substream(fe, stream);
1673  enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1674  int err;
1675 
1676  dev_dbg(fe->dev, "runtime %s close on FE %s\n",
1677  stream ? "capture" : "playback", fe->dai_link->name);
1678 
1679  if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1680  /* call bespoke trigger - FE takes care of all BE triggers */
1681  dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd stop\n",
1682  fe->dai_link->name);
1683 
1684  err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1685  if (err < 0)
1686  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1687  } else {
1688  dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
1689  fe->dai_link->name);
1690 
1691  err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
1692  if (err < 0)
1693  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
1694  }
1695 
1696  err = dpcm_be_dai_hw_free(fe, stream);
1697  if (err < 0)
1698  dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);
1699 
1700  err = dpcm_be_dai_shutdown(fe, stream);
1701  if (err < 0)
1702  dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);
1703 
1704  /* run the stream event for each BE */
1705  dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1706 
1707  return 0;
1708 }
1709 
1710 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
1711 {
1712  struct snd_pcm_substream *substream =
1713  snd_soc_dpcm_get_substream(fe, stream);
1714  struct snd_soc_dpcm *dpcm;
1715  enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1716  int ret;
1717 
1718  dev_dbg(fe->dev, "runtime %s open on FE %s\n",
1719  stream ? "capture" : "playback", fe->dai_link->name);
1720 
1721  /* Only start the BE if the FE is ready */
1722  if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
1723  fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
1724  return -EINVAL;
1725 
1726  /* startup must always be called for new BEs */
1727  ret = dpcm_be_dai_startup(fe, stream);
1728  if (ret < 0) {
1729  goto disconnect;
1730  return ret;
1731  }
1732 
1733  /* keep going if FE state is > open */
1734  if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
1735  return 0;
1736 
1737  ret = dpcm_be_dai_hw_params(fe, stream);
1738  if (ret < 0) {
1739  goto close;
1740  return ret;
1741  }
1742 
1743  /* keep going if FE state is > hw_params */
1744  if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
1745  return 0;
1746 
1747 
1748  ret = dpcm_be_dai_prepare(fe, stream);
1749  if (ret < 0) {
1750  goto hw_free;
1751  return ret;
1752  }
1753 
1754  /* run the stream event for each BE */
1755  dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
1756 
1757  /* keep going if FE state is > prepare */
1758  if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
1759  fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
1760  return 0;
1761 
1762  if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
1763  /* call trigger on the frontend - FE takes care of all BE triggers */
1764  dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd start\n",
1765  fe->dai_link->name);
1766 
1767  ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
1768  if (ret < 0) {
1769  dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
1770  goto hw_free;
1771  }
1772  } else {
1773  dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
1774  fe->dai_link->name);
1775 
1776  ret = dpcm_be_dai_trigger(fe, stream,
1777  SNDRV_PCM_TRIGGER_START);
1778  if (ret < 0) {
1779  dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
1780  goto hw_free;
1781  }
1782  }
1783 
1784  return 0;
1785 
1786 hw_free:
1787  dpcm_be_dai_hw_free(fe, stream);
1788 close:
1789  dpcm_be_dai_shutdown(fe, stream);
1790 disconnect:
1791  /* disconnect any non started BEs */
1792  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1793  struct snd_soc_pcm_runtime *be = dpcm->be;
1794  if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1795  dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1796  }
1797 
1798  return ret;
1799 }
1800 
1801 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
1802 {
1803  int ret;
1804 
1805  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1806  ret = dpcm_run_update_startup(fe, stream);
1807  if (ret < 0)
1808  dev_err(fe->dev, "failed to startup some BEs\n");
1809  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1810 
1811  return ret;
1812 }
1813 
1814 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
1815 {
1816  int ret;
1817 
1818  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1819  ret = dpcm_run_update_shutdown(fe, stream);
1820  if (ret < 0)
1821  dev_err(fe->dev, "failed to shutdown some BEs\n");
1822  fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
1823 
1824  return ret;
1825 }
1826 
1827 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
1828  * any DAI links.
1829  */
1830 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
1831 {
1832  struct snd_soc_card *card;
1833  int i, old, new, paths;
1834 
1835  if (widget->codec)
1836  card = widget->codec->card;
1837  else if (widget->platform)
1838  card = widget->platform->card;
1839  else
1840  return -EINVAL;
1841 
1842  mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1843  for (i = 0; i < card->num_rtd; i++) {
1844  struct snd_soc_dapm_widget_list *list;
1845  struct snd_soc_pcm_runtime *fe = &card->rtd[i];
1846 
1847  /* make sure link is FE */
1848  if (!fe->dai_link->dynamic)
1849  continue;
1850 
1851  /* only check active links */
1852  if (!fe->cpu_dai->active)
1853  continue;
1854 
1855  /* DAPM sync will call this to update DSP paths */
1856  dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
1857  fe->dai_link->name);
1858 
1859  /* skip if FE doesn't have playback capability */
1860  if (!fe->cpu_dai->driver->playback.channels_min)
1861  goto capture;
1862 
1863  paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
1864  if (paths < 0) {
1865  dev_warn(fe->dev, "%s no valid %s path\n",
1866  fe->dai_link->name, "playback");
1867  mutex_unlock(&card->mutex);
1868  return paths;
1869  }
1870 
1871  /* update any new playback paths */
1872  new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
1873  if (new) {
1874  dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1875  dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1876  dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1877  }
1878 
1879  /* update any old playback paths */
1880  old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
1881  if (old) {
1882  dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
1883  dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
1884  dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
1885  }
1886 
1887 capture:
1888  /* skip if FE doesn't have capture capability */
1889  if (!fe->cpu_dai->driver->capture.channels_min)
1890  continue;
1891 
1892  paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
1893  if (paths < 0) {
1894  dev_warn(fe->dev, "%s no valid %s path\n",
1895  fe->dai_link->name, "capture");
1896  mutex_unlock(&card->mutex);
1897  return paths;
1898  }
1899 
1900  /* update any new capture paths */
1901  new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
1902  if (new) {
1903  dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1904  dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1905  dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1906  }
1907 
1908  /* update any old capture paths */
1909  old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
1910  if (old) {
1911  dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
1912  dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
1913  dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
1914  }
1915 
1916  dpcm_path_put(&list);
1917  }
1918 
1919  mutex_unlock(&card->mutex);
1920  return 0;
1921 }
1922 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
1923 {
1924  struct snd_soc_dpcm *dpcm;
1925  struct list_head *clients =
1926  &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
1927 
1928  list_for_each_entry(dpcm, clients, list_be) {
1929 
1930  struct snd_soc_pcm_runtime *be = dpcm->be;
1931  struct snd_soc_dai *dai = be->codec_dai;
1932  struct snd_soc_dai_driver *drv = dai->driver;
1933 
1934  if (be->dai_link->ignore_suspend)
1935  continue;
1936 
1937  dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
1938 
1939  if (drv->ops->digital_mute && dai->playback_active)
1940  drv->ops->digital_mute(dai, mute);
1941  }
1942 
1943  return 0;
1944 }
1945 
1946 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1947 {
1948  struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1949  struct snd_soc_dpcm *dpcm;
1950  struct snd_soc_dapm_widget_list *list;
1951  int ret;
1952  int stream = fe_substream->stream;
1953 
1954  mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1955  fe->dpcm[stream].runtime = fe_substream->runtime;
1956 
1957  if (dpcm_path_get(fe, stream, &list) <= 0) {
1958  dev_dbg(fe->dev, "asoc: %s no valid %s route\n",
1959  fe->dai_link->name, stream ? "capture" : "playback");
1960  }
1961 
1962  /* calculate valid and active FE <-> BE dpcms */
1963  dpcm_process_paths(fe, stream, &list, 1);
1964 
1965  ret = dpcm_fe_dai_startup(fe_substream);
1966  if (ret < 0) {
1967  /* clean up all links */
1968  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1969  dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1970 
1971  dpcm_be_disconnect(fe, stream);
1972  fe->dpcm[stream].runtime = NULL;
1973  }
1974 
1975  dpcm_clear_pending_state(fe, stream);
1976  dpcm_path_put(&list);
1977  mutex_unlock(&fe->card->mutex);
1978  return ret;
1979 }
1980 
1981 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1982 {
1983  struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1984  struct snd_soc_dpcm *dpcm;
1985  int stream = fe_substream->stream, ret;
1986 
1987  mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1988  ret = dpcm_fe_dai_shutdown(fe_substream);
1989 
1990  /* mark FE's links ready to prune */
1991  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1992  dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1993 
1994  dpcm_be_disconnect(fe, stream);
1995 
1996  fe->dpcm[stream].runtime = NULL;
1997  mutex_unlock(&fe->card->mutex);
1998  return ret;
1999 }
2000 
2001 /* create a new pcm */
2002 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2003 {
2004  struct snd_soc_platform *platform = rtd->platform;
2005  struct snd_soc_dai *codec_dai = rtd->codec_dai;
2006  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2007  struct snd_pcm *pcm;
2008  char new_name[64];
2009  int ret = 0, playback = 0, capture = 0;
2010 
2011  if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2012  if (cpu_dai->driver->playback.channels_min)
2013  playback = 1;
2014  if (cpu_dai->driver->capture.channels_min)
2015  capture = 1;
2016  } else {
2017  if (codec_dai->driver->playback.channels_min)
2018  playback = 1;
2019  if (codec_dai->driver->capture.channels_min)
2020  capture = 1;
2021  }
2022 
2023  /* create the PCM */
2024  if (rtd->dai_link->no_pcm) {
2025  snprintf(new_name, sizeof(new_name), "(%s)",
2026  rtd->dai_link->stream_name);
2027 
2028  ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2029  playback, capture, &pcm);
2030  } else {
2031  if (rtd->dai_link->dynamic)
2032  snprintf(new_name, sizeof(new_name), "%s (*)",
2033  rtd->dai_link->stream_name);
2034  else
2035  snprintf(new_name, sizeof(new_name), "%s %s-%d",
2036  rtd->dai_link->stream_name, codec_dai->name, num);
2037 
2038  ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2039  capture, &pcm);
2040  }
2041  if (ret < 0) {
2042  dev_err(rtd->card->dev, "can't create pcm for %s\n",
2043  rtd->dai_link->name);
2044  return ret;
2045  }
2046  dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
2047 
2048  /* DAPM dai link stream work */
2049  INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2050 
2051  rtd->pcm = pcm;
2052  pcm->private_data = rtd;
2053 
2054  if (rtd->dai_link->no_pcm) {
2055  if (playback)
2056  pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2057  if (capture)
2058  pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2059  goto out;
2060  }
2061 
2062  /* ASoC PCM operations */
2063  if (rtd->dai_link->dynamic) {
2064  rtd->ops.open = dpcm_fe_dai_open;
2065  rtd->ops.hw_params = dpcm_fe_dai_hw_params;
2066  rtd->ops.prepare = dpcm_fe_dai_prepare;
2067  rtd->ops.trigger = dpcm_fe_dai_trigger;
2068  rtd->ops.hw_free = dpcm_fe_dai_hw_free;
2069  rtd->ops.close = dpcm_fe_dai_close;
2070  rtd->ops.pointer = soc_pcm_pointer;
2071  rtd->ops.ioctl = soc_pcm_ioctl;
2072  } else {
2073  rtd->ops.open = soc_pcm_open;
2074  rtd->ops.hw_params = soc_pcm_hw_params;
2075  rtd->ops.prepare = soc_pcm_prepare;
2076  rtd->ops.trigger = soc_pcm_trigger;
2077  rtd->ops.hw_free = soc_pcm_hw_free;
2078  rtd->ops.close = soc_pcm_close;
2079  rtd->ops.pointer = soc_pcm_pointer;
2080  rtd->ops.ioctl = soc_pcm_ioctl;
2081  }
2082 
2083  if (platform->driver->ops) {
2084  rtd->ops.ack = platform->driver->ops->ack;
2085  rtd->ops.copy = platform->driver->ops->copy;
2086  rtd->ops.silence = platform->driver->ops->silence;
2087  rtd->ops.page = platform->driver->ops->page;
2088  rtd->ops.mmap = platform->driver->ops->mmap;
2089  }
2090 
2091  if (playback)
2092  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2093 
2094  if (capture)
2095  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2096 
2097  if (platform->driver->pcm_new) {
2098  ret = platform->driver->pcm_new(rtd);
2099  if (ret < 0) {
2100  dev_err(platform->dev, "pcm constructor failed\n");
2101  return ret;
2102  }
2103  }
2104 
2105  pcm->private_free = platform->driver->pcm_free;
2106 out:
2107  dev_info(rtd->card->dev, " %s <-> %s mapping ok\n", codec_dai->name,
2108  cpu_dai->name);
2109  return ret;
2110 }
2111 
2112 /* is the current PCM operation for this FE ? */
2113 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2114 {
2115  if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2116  return 1;
2117  return 0;
2118 }
2119 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2120 
2121 /* is the current PCM operation for this BE ? */
2122 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2123  struct snd_soc_pcm_runtime *be, int stream)
2124 {
2125  if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2126  ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2127  be->dpcm[stream].runtime_update))
2128  return 1;
2129  return 0;
2130 }
2131 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2132 
2133 /* get the substream for this BE */
2134 struct snd_pcm_substream *
2135  snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2136 {
2137  return be->pcm->streams[stream].substream;
2138 }
2139 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2140 
2141 /* get the BE runtime state */
2142 enum snd_soc_dpcm_state
2143  snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2144 {
2145  return be->dpcm[stream].state;
2146 }
2147 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2148 
2149 /* set the BE runtime state */
2150 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2151  int stream, enum snd_soc_dpcm_state state)
2152 {
2153  be->dpcm[stream].state = state;
2154 }
2155 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2156 
2157 /*
2158  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2159  * are not running, paused or suspended for the specified stream direction.
2160  */
2161 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2162  struct snd_soc_pcm_runtime *be, int stream)
2163 {
2164  struct snd_soc_dpcm *dpcm;
2165  int state;
2166 
2167  list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2168 
2169  if (dpcm->fe == fe)
2170  continue;
2171 
2172  state = dpcm->fe->dpcm[stream].state;
2173  if (state == SND_SOC_DPCM_STATE_START ||
2174  state == SND_SOC_DPCM_STATE_PAUSED ||
2175  state == SND_SOC_DPCM_STATE_SUSPEND)
2176  return 0;
2177  }
2178 
2179  /* it's safe to free/stop this BE DAI */
2180  return 1;
2181 }
2182 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2183 
2184 /*
2185  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2186  * running, paused or suspended for the specified stream direction.
2187  */
2188 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2189  struct snd_soc_pcm_runtime *be, int stream)
2190 {
2191  struct snd_soc_dpcm *dpcm;
2192  int state;
2193 
2194  list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2195 
2196  if (dpcm->fe == fe)
2197  continue;
2198 
2199  state = dpcm->fe->dpcm[stream].state;
2200  if (state == SND_SOC_DPCM_STATE_START ||
2201  state == SND_SOC_DPCM_STATE_PAUSED ||
2202  state == SND_SOC_DPCM_STATE_SUSPEND ||
2203  state == SND_SOC_DPCM_STATE_PREPARE)
2204  return 0;
2205  }
2206 
2207  /* it's safe to change hw_params */
2208  return 1;
2209 }
2210 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2211 
2212 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2213  int cmd, struct snd_soc_platform *platform)
2214 {
2215  if (platform->driver->ops->trigger)
2216  return platform->driver->ops->trigger(substream, cmd);
2217  return 0;
2218 }
2219 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2220 
2221 #ifdef CONFIG_DEBUG_FS
2222 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2223 {
2224  switch (state) {
2225  case SND_SOC_DPCM_STATE_NEW:
2226  return "new";
2227  case SND_SOC_DPCM_STATE_OPEN:
2228  return "open";
2229  case SND_SOC_DPCM_STATE_HW_PARAMS:
2230  return "hw_params";
2231  case SND_SOC_DPCM_STATE_PREPARE:
2232  return "prepare";
2233  case SND_SOC_DPCM_STATE_START:
2234  return "start";
2235  case SND_SOC_DPCM_STATE_STOP:
2236  return "stop";
2237  case SND_SOC_DPCM_STATE_SUSPEND:
2238  return "suspend";
2239  case SND_SOC_DPCM_STATE_PAUSED:
2240  return "paused";
2241  case SND_SOC_DPCM_STATE_HW_FREE:
2242  return "hw_free";
2243  case SND_SOC_DPCM_STATE_CLOSE:
2244  return "close";
2245  }
2246 
2247  return "unknown";
2248 }
2249 
2250 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2251  int stream, char *buf, size_t size)
2252 {
2253  struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2254  struct snd_soc_dpcm *dpcm;
2255  ssize_t offset = 0;
2256 
2257  /* FE state */
2258  offset += snprintf(buf + offset, size - offset,
2259  "[%s - %s]\n", fe->dai_link->name,
2260  stream ? "Capture" : "Playback");
2261 
2262  offset += snprintf(buf + offset, size - offset, "State: %s\n",
2263  dpcm_state_string(fe->dpcm[stream].state));
2264 
2265  if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2266  (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2267  offset += snprintf(buf + offset, size - offset,
2268  "Hardware Params: "
2269  "Format = %s, Channels = %d, Rate = %d\n",
2270  snd_pcm_format_name(params_format(params)),
2271  params_channels(params),
2272  params_rate(params));
2273 
2274  /* BEs state */
2275  offset += snprintf(buf + offset, size - offset, "Backends:\n");
2276 
2277  if (list_empty(&fe->dpcm[stream].be_clients)) {
2278  offset += snprintf(buf + offset, size - offset,
2279  " No active DSP links\n");
2280  goto out;
2281  }
2282 
2283  list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2284  struct snd_soc_pcm_runtime *be = dpcm->be;
2285  params = &dpcm->hw_params;
2286 
2287  offset += snprintf(buf + offset, size - offset,
2288  "- %s\n", be->dai_link->name);
2289 
2290  offset += snprintf(buf + offset, size - offset,
2291  " State: %s\n",
2292  dpcm_state_string(be->dpcm[stream].state));
2293 
2294  if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2295  (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2296  offset += snprintf(buf + offset, size - offset,
2297  " Hardware Params: "
2298  "Format = %s, Channels = %d, Rate = %d\n",
2299  snd_pcm_format_name(params_format(params)),
2300  params_channels(params),
2301  params_rate(params));
2302  }
2303 
2304 out:
2305  return offset;
2306 }
2307 
2308 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2309  size_t count, loff_t *ppos)
2310 {
2311  struct snd_soc_pcm_runtime *fe = file->private_data;
2312  ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2313  char *buf;
2314 
2315  buf = kmalloc(out_count, GFP_KERNEL);
2316  if (!buf)
2317  return -ENOMEM;
2318 
2319  if (fe->cpu_dai->driver->playback.channels_min)
2320  offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2321  buf + offset, out_count - offset);
2322 
2323  if (fe->cpu_dai->driver->capture.channels_min)
2324  offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2325  buf + offset, out_count - offset);
2326 
2327  ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2328 
2329  kfree(buf);
2330  return ret;
2331 }
2332 
2333 static const struct file_operations dpcm_state_fops = {
2334  .open = simple_open,
2335  .read = dpcm_state_read_file,
2336  .llseek = default_llseek,
2337 };
2338 
2339 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2340 {
2341  if (!rtd->dai_link)
2342  return 0;
2343 
2344  rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2345  rtd->card->debugfs_card_root);
2346  if (!rtd->debugfs_dpcm_root) {
2347  dev_dbg(rtd->dev,
2348  "ASoC: Failed to create dpcm debugfs directory %s\n",
2349  rtd->dai_link->name);
2350  return -EINVAL;
2351  }
2352 
2353  rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2354  rtd->debugfs_dpcm_root,
2355  rtd, &dpcm_state_fops);
2356 
2357  return 0;
2358 }
2359 #endif
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