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Linux/sound/soc/soc-pcm.c

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  1 // SPDX-License-Identifier: GPL-2.0+
  2 //
  3 // soc-pcm.c  --  ALSA SoC PCM
  4 //
  5 // Copyright 2005 Wolfson Microelectronics PLC.
  6 // Copyright 2005 Openedhand Ltd.
  7 // Copyright (C) 2010 Slimlogic Ltd.
  8 // Copyright (C) 2010 Texas Instruments Inc.
  9 //
 10 // Authors: Liam Girdwood <lrg@ti.com>
 11 //          Mark Brown <broonie@opensource.wolfsonmicro.com>
 12 
 13 #include <linux/kernel.h>
 14 #include <linux/init.h>
 15 #include <linux/delay.h>
 16 #include <linux/pinctrl/consumer.h>
 17 #include <linux/pm_runtime.h>
 18 #include <linux/module.h>
 19 #include <linux/slab.h>
 20 #include <linux/workqueue.h>
 21 #include <linux/export.h>
 22 #include <linux/debugfs.h>
 23 #include <sound/core.h>
 24 #include <sound/pcm.h>
 25 #include <sound/pcm_params.h>
 26 #include <sound/soc.h>
 27 #include <sound/soc-dpcm.h>
 28 #include <sound/initval.h>
 29 
 30 #define DPCM_MAX_BE_USERS       8
 31 
 32 /*
 33  * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
 34  *
 35  * Returns true if the DAI supports the indicated stream type.
 36  */
 37 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
 38 {
 39         struct snd_soc_pcm_stream *codec_stream;
 40 
 41         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 42                 codec_stream = &dai->driver->playback;
 43         else
 44                 codec_stream = &dai->driver->capture;
 45 
 46         /* If the codec specifies any channels at all, it supports the stream */
 47         return codec_stream->channels_min;
 48 }
 49 
 50 /**
 51  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
 52  * @rtd: ASoC PCM runtime that is activated
 53  * @stream: Direction of the PCM stream
 54  *
 55  * Increments the active count for all the DAIs and components attached to a PCM
 56  * runtime. Should typically be called when a stream is opened.
 57  *
 58  * Must be called with the rtd->pcm_mutex being held
 59  */
 60 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
 61 {
 62         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 63         struct snd_soc_dai *codec_dai;
 64         int i;
 65 
 66         lockdep_assert_held(&rtd->pcm_mutex);
 67 
 68         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 69                 cpu_dai->playback_active++;
 70                 for_each_rtd_codec_dai(rtd, i, codec_dai)
 71                         codec_dai->playback_active++;
 72         } else {
 73                 cpu_dai->capture_active++;
 74                 for_each_rtd_codec_dai(rtd, i, codec_dai)
 75                         codec_dai->capture_active++;
 76         }
 77 
 78         cpu_dai->active++;
 79         cpu_dai->component->active++;
 80         for_each_rtd_codec_dai(rtd, i, codec_dai) {
 81                 codec_dai->active++;
 82                 codec_dai->component->active++;
 83         }
 84 }
 85 
 86 /**
 87  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
 88  * @rtd: ASoC PCM runtime that is deactivated
 89  * @stream: Direction of the PCM stream
 90  *
 91  * Decrements the active count for all the DAIs and components attached to a PCM
 92  * runtime. Should typically be called when a stream is closed.
 93  *
 94  * Must be called with the rtd->pcm_mutex being held
 95  */
 96 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
 97 {
 98         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 99         struct snd_soc_dai *codec_dai;
100         int i;
101 
102         lockdep_assert_held(&rtd->pcm_mutex);
103 
104         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
105                 cpu_dai->playback_active--;
106                 for_each_rtd_codec_dai(rtd, i, codec_dai)
107                         codec_dai->playback_active--;
108         } else {
109                 cpu_dai->capture_active--;
110                 for_each_rtd_codec_dai(rtd, i, codec_dai)
111                         codec_dai->capture_active--;
112         }
113 
114         cpu_dai->active--;
115         cpu_dai->component->active--;
116         for_each_rtd_codec_dai(rtd, i, codec_dai) {
117                 codec_dai->component->active--;
118                 codec_dai->active--;
119         }
120 }
121 
122 /**
123  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
124  * @rtd: The ASoC PCM runtime that should be checked.
125  *
126  * This function checks whether the power down delay should be ignored for a
127  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
128  * been configured to ignore the delay, or if none of the components benefits
129  * from having the delay.
130  */
131 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
132 {
133         struct snd_soc_rtdcom_list *rtdcom;
134         struct snd_soc_component *component;
135         bool ignore = true;
136 
137         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
138                 return true;
139 
140         for_each_rtdcom(rtd, rtdcom) {
141                 component = rtdcom->component;
142 
143                 ignore &= !component->driver->use_pmdown_time;
144         }
145 
146         return ignore;
147 }
148 
149 /**
150  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
151  * @substream: the pcm substream
152  * @hw: the hardware parameters
153  *
154  * Sets the substream runtime hardware parameters.
155  */
156 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
157         const struct snd_pcm_hardware *hw)
158 {
159         struct snd_pcm_runtime *runtime = substream->runtime;
160         runtime->hw.info = hw->info;
161         runtime->hw.formats = hw->formats;
162         runtime->hw.period_bytes_min = hw->period_bytes_min;
163         runtime->hw.period_bytes_max = hw->period_bytes_max;
164         runtime->hw.periods_min = hw->periods_min;
165         runtime->hw.periods_max = hw->periods_max;
166         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
167         runtime->hw.fifo_size = hw->fifo_size;
168         return 0;
169 }
170 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
171 
172 /* DPCM stream event, send event to FE and all active BEs. */
173 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
174         int event)
175 {
176         struct snd_soc_dpcm *dpcm;
177 
178         for_each_dpcm_be(fe, dir, dpcm) {
179 
180                 struct snd_soc_pcm_runtime *be = dpcm->be;
181 
182                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
183                                 be->dai_link->name, event, dir);
184 
185                 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
186                     (be->dpcm[dir].users >= 1))
187                         continue;
188 
189                 snd_soc_dapm_stream_event(be, dir, event);
190         }
191 
192         snd_soc_dapm_stream_event(fe, dir, event);
193 
194         return 0;
195 }
196 
197 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
198                                         struct snd_soc_dai *soc_dai)
199 {
200         struct snd_soc_pcm_runtime *rtd = substream->private_data;
201         int ret;
202 
203         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
204                                 rtd->dai_link->symmetric_rates)) {
205                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
206                                 soc_dai->rate);
207 
208                 ret = snd_pcm_hw_constraint_single(substream->runtime,
209                                                 SNDRV_PCM_HW_PARAM_RATE,
210                                                 soc_dai->rate);
211                 if (ret < 0) {
212                         dev_err(soc_dai->dev,
213                                 "ASoC: Unable to apply rate constraint: %d\n",
214                                 ret);
215                         return ret;
216                 }
217         }
218 
219         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
220                                 rtd->dai_link->symmetric_channels)) {
221                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
222                                 soc_dai->channels);
223 
224                 ret = snd_pcm_hw_constraint_single(substream->runtime,
225                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
226                                                 soc_dai->channels);
227                 if (ret < 0) {
228                         dev_err(soc_dai->dev,
229                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
230                                 ret);
231                         return ret;
232                 }
233         }
234 
235         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
236                                 rtd->dai_link->symmetric_samplebits)) {
237                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
238                                 soc_dai->sample_bits);
239 
240                 ret = snd_pcm_hw_constraint_single(substream->runtime,
241                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
242                                                 soc_dai->sample_bits);
243                 if (ret < 0) {
244                         dev_err(soc_dai->dev,
245                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
246                                 ret);
247                         return ret;
248                 }
249         }
250 
251         return 0;
252 }
253 
254 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
255                                 struct snd_pcm_hw_params *params)
256 {
257         struct snd_soc_pcm_runtime *rtd = substream->private_data;
258         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
259         struct snd_soc_dai *codec_dai;
260         unsigned int rate, channels, sample_bits, symmetry, i;
261 
262         rate = params_rate(params);
263         channels = params_channels(params);
264         sample_bits = snd_pcm_format_physical_width(params_format(params));
265 
266         /* reject unmatched parameters when applying symmetry */
267         symmetry = cpu_dai->driver->symmetric_rates ||
268                 rtd->dai_link->symmetric_rates;
269 
270         for_each_rtd_codec_dai(rtd, i, codec_dai)
271                 symmetry |= codec_dai->driver->symmetric_rates;
272 
273         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
274                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
275                                 cpu_dai->rate, rate);
276                 return -EINVAL;
277         }
278 
279         symmetry = cpu_dai->driver->symmetric_channels ||
280                 rtd->dai_link->symmetric_channels;
281 
282         for_each_rtd_codec_dai(rtd, i, codec_dai)
283                 symmetry |= codec_dai->driver->symmetric_channels;
284 
285         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
286                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
287                                 cpu_dai->channels, channels);
288                 return -EINVAL;
289         }
290 
291         symmetry = cpu_dai->driver->symmetric_samplebits ||
292                 rtd->dai_link->symmetric_samplebits;
293 
294         for_each_rtd_codec_dai(rtd, i, codec_dai)
295                 symmetry |= codec_dai->driver->symmetric_samplebits;
296 
297         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
298                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
299                                 cpu_dai->sample_bits, sample_bits);
300                 return -EINVAL;
301         }
302 
303         return 0;
304 }
305 
306 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
307 {
308         struct snd_soc_pcm_runtime *rtd = substream->private_data;
309         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
310         struct snd_soc_dai_link *link = rtd->dai_link;
311         struct snd_soc_dai *codec_dai;
312         unsigned int symmetry, i;
313 
314         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
315                 cpu_driver->symmetric_channels || link->symmetric_channels ||
316                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
317 
318         for_each_rtd_codec_dai(rtd, i, codec_dai)
319                 symmetry = symmetry ||
320                         codec_dai->driver->symmetric_rates ||
321                         codec_dai->driver->symmetric_channels ||
322                         codec_dai->driver->symmetric_samplebits;
323 
324         return symmetry;
325 }
326 
327 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
328 {
329         struct snd_soc_pcm_runtime *rtd = substream->private_data;
330         int ret;
331 
332         if (!bits)
333                 return;
334 
335         ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
336         if (ret != 0)
337                 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
338                                  bits, ret);
339 }
340 
341 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
342 {
343         struct snd_soc_pcm_runtime *rtd = substream->private_data;
344         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
345         struct snd_soc_dai *codec_dai;
346         int i;
347         unsigned int bits = 0, cpu_bits;
348 
349         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
350                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
351                         if (codec_dai->driver->playback.sig_bits == 0) {
352                                 bits = 0;
353                                 break;
354                         }
355                         bits = max(codec_dai->driver->playback.sig_bits, bits);
356                 }
357                 cpu_bits = cpu_dai->driver->playback.sig_bits;
358         } else {
359                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
360                         if (codec_dai->driver->capture.sig_bits == 0) {
361                                 bits = 0;
362                                 break;
363                         }
364                         bits = max(codec_dai->driver->capture.sig_bits, bits);
365                 }
366                 cpu_bits = cpu_dai->driver->capture.sig_bits;
367         }
368 
369         soc_pcm_set_msb(substream, bits);
370         soc_pcm_set_msb(substream, cpu_bits);
371 }
372 
373 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
374 {
375         struct snd_pcm_runtime *runtime = substream->runtime;
376         struct snd_pcm_hardware *hw = &runtime->hw;
377         struct snd_soc_pcm_runtime *rtd = substream->private_data;
378         struct snd_soc_dai *codec_dai;
379         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
380         struct snd_soc_dai_driver *codec_dai_drv;
381         struct snd_soc_pcm_stream *codec_stream;
382         struct snd_soc_pcm_stream *cpu_stream;
383         unsigned int chan_min = 0, chan_max = UINT_MAX;
384         unsigned int rate_min = 0, rate_max = UINT_MAX;
385         unsigned int rates = UINT_MAX;
386         u64 formats = ULLONG_MAX;
387         int i;
388 
389         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
390                 cpu_stream = &cpu_dai_drv->playback;
391         else
392                 cpu_stream = &cpu_dai_drv->capture;
393 
394         /* first calculate min/max only for CODECs in the DAI link */
395         for_each_rtd_codec_dai(rtd, i, codec_dai) {
396 
397                 /*
398                  * Skip CODECs which don't support the current stream type.
399                  * Otherwise, since the rate, channel, and format values will
400                  * zero in that case, we would have no usable settings left,
401                  * causing the resulting setup to fail.
402                  * At least one CODEC should match, otherwise we should have
403                  * bailed out on a higher level, since there would be no
404                  * CODEC to support the transfer direction in that case.
405                  */
406                 if (!snd_soc_dai_stream_valid(codec_dai,
407                                               substream->stream))
408                         continue;
409 
410                 codec_dai_drv = codec_dai->driver;
411                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
412                         codec_stream = &codec_dai_drv->playback;
413                 else
414                         codec_stream = &codec_dai_drv->capture;
415                 chan_min = max(chan_min, codec_stream->channels_min);
416                 chan_max = min(chan_max, codec_stream->channels_max);
417                 rate_min = max(rate_min, codec_stream->rate_min);
418                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
419                 formats &= codec_stream->formats;
420                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
421         }
422 
423         /*
424          * chan min/max cannot be enforced if there are multiple CODEC DAIs
425          * connected to a single CPU DAI, use CPU DAI's directly and let
426          * channel allocation be fixed up later
427          */
428         if (rtd->num_codecs > 1) {
429                 chan_min = cpu_stream->channels_min;
430                 chan_max = cpu_stream->channels_max;
431         }
432 
433         hw->channels_min = max(chan_min, cpu_stream->channels_min);
434         hw->channels_max = min(chan_max, cpu_stream->channels_max);
435         if (hw->formats)
436                 hw->formats &= formats & cpu_stream->formats;
437         else
438                 hw->formats = formats & cpu_stream->formats;
439         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
440 
441         snd_pcm_limit_hw_rates(runtime);
442 
443         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
444         hw->rate_min = max(hw->rate_min, rate_min);
445         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
446         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
447 }
448 
449 static int soc_pcm_components_open(struct snd_pcm_substream *substream,
450                                    struct snd_soc_component **last)
451 {
452         struct snd_soc_pcm_runtime *rtd = substream->private_data;
453         struct snd_soc_rtdcom_list *rtdcom;
454         struct snd_soc_component *component;
455         int ret = 0;
456 
457         for_each_rtdcom(rtd, rtdcom) {
458                 component = rtdcom->component;
459                 *last = component;
460 
461                 if (component->driver->module_get_upon_open &&
462                     !try_module_get(component->dev->driver->owner)) {
463                         dev_err(component->dev,
464                                 "ASoC: can't get module %s\n",
465                                 component->name);
466                         return -ENODEV;
467                 }
468 
469                 if (!component->driver->ops ||
470                     !component->driver->ops->open)
471                         continue;
472 
473                 ret = component->driver->ops->open(substream);
474                 if (ret < 0) {
475                         dev_err(component->dev,
476                                 "ASoC: can't open component %s: %d\n",
477                                 component->name, ret);
478                         return ret;
479                 }
480         }
481         *last = NULL;
482         return 0;
483 }
484 
485 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
486                                     struct snd_soc_component *last)
487 {
488         struct snd_soc_pcm_runtime *rtd = substream->private_data;
489         struct snd_soc_rtdcom_list *rtdcom;
490         struct snd_soc_component *component;
491 
492         for_each_rtdcom(rtd, rtdcom) {
493                 component = rtdcom->component;
494 
495                 if (component == last)
496                         break;
497 
498                 if (component->driver->ops &&
499                     component->driver->ops->close)
500                         component->driver->ops->close(substream);
501 
502                 if (component->driver->module_get_upon_open)
503                         module_put(component->dev->driver->owner);
504         }
505 
506         return 0;
507 }
508 
509 /*
510  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
511  * then initialized and any private data can be allocated. This also calls
512  * startup for the cpu DAI, component, machine and codec DAI.
513  */
514 static int soc_pcm_open(struct snd_pcm_substream *substream)
515 {
516         struct snd_soc_pcm_runtime *rtd = substream->private_data;
517         struct snd_pcm_runtime *runtime = substream->runtime;
518         struct snd_soc_component *component;
519         struct snd_soc_rtdcom_list *rtdcom;
520         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
521         struct snd_soc_dai *codec_dai;
522         const char *codec_dai_name = "multicodec";
523         int i, ret = 0;
524 
525         pinctrl_pm_select_default_state(cpu_dai->dev);
526         for_each_rtd_codec_dai(rtd, i, codec_dai)
527                 pinctrl_pm_select_default_state(codec_dai->dev);
528 
529         for_each_rtdcom(rtd, rtdcom) {
530                 component = rtdcom->component;
531 
532                 pm_runtime_get_sync(component->dev);
533         }
534 
535         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
536 
537         /* startup the audio subsystem */
538         if (cpu_dai->driver->ops->startup) {
539                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
540                 if (ret < 0) {
541                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
542                                 " %s: %d\n", cpu_dai->name, ret);
543                         goto out;
544                 }
545         }
546 
547         ret = soc_pcm_components_open(substream, &component);
548         if (ret < 0)
549                 goto component_err;
550 
551         for_each_rtd_codec_dai(rtd, i, codec_dai) {
552                 if (codec_dai->driver->ops->startup) {
553                         ret = codec_dai->driver->ops->startup(substream,
554                                                               codec_dai);
555                         if (ret < 0) {
556                                 dev_err(codec_dai->dev,
557                                         "ASoC: can't open codec %s: %d\n",
558                                         codec_dai->name, ret);
559                                 goto codec_dai_err;
560                         }
561                 }
562 
563                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
564                         codec_dai->tx_mask = 0;
565                 else
566                         codec_dai->rx_mask = 0;
567         }
568 
569         if (rtd->dai_link->ops->startup) {
570                 ret = rtd->dai_link->ops->startup(substream);
571                 if (ret < 0) {
572                         pr_err("ASoC: %s startup failed: %d\n",
573                                rtd->dai_link->name, ret);
574                         goto machine_err;
575                 }
576         }
577 
578         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
579         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
580                 goto dynamic;
581 
582         /* Check that the codec and cpu DAIs are compatible */
583         soc_pcm_init_runtime_hw(substream);
584 
585         if (rtd->num_codecs == 1)
586                 codec_dai_name = rtd->codec_dai->name;
587 
588         if (soc_pcm_has_symmetry(substream))
589                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
590 
591         ret = -EINVAL;
592         if (!runtime->hw.rates) {
593                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
594                         codec_dai_name, cpu_dai->name);
595                 goto config_err;
596         }
597         if (!runtime->hw.formats) {
598                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
599                         codec_dai_name, cpu_dai->name);
600                 goto config_err;
601         }
602         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
603             runtime->hw.channels_min > runtime->hw.channels_max) {
604                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
605                                 codec_dai_name, cpu_dai->name);
606                 goto config_err;
607         }
608 
609         soc_pcm_apply_msb(substream);
610 
611         /* Symmetry only applies if we've already got an active stream. */
612         if (cpu_dai->active) {
613                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
614                 if (ret != 0)
615                         goto config_err;
616         }
617 
618         for_each_rtd_codec_dai(rtd, i, codec_dai) {
619                 if (codec_dai->active) {
620                         ret = soc_pcm_apply_symmetry(substream, codec_dai);
621                         if (ret != 0)
622                                 goto config_err;
623                 }
624         }
625 
626         pr_debug("ASoC: %s <-> %s info:\n",
627                         codec_dai_name, cpu_dai->name);
628         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
629         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
630                  runtime->hw.channels_max);
631         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
632                  runtime->hw.rate_max);
633 
634 dynamic:
635 
636         snd_soc_runtime_activate(rtd, substream->stream);
637 
638         mutex_unlock(&rtd->pcm_mutex);
639         return 0;
640 
641 config_err:
642         if (rtd->dai_link->ops->shutdown)
643                 rtd->dai_link->ops->shutdown(substream);
644 
645 machine_err:
646         i = rtd->num_codecs;
647 
648 codec_dai_err:
649         for_each_rtd_codec_dai_rollback(rtd, i, codec_dai) {
650                 if (codec_dai->driver->ops->shutdown)
651                         codec_dai->driver->ops->shutdown(substream, codec_dai);
652         }
653 
654 component_err:
655         soc_pcm_components_close(substream, component);
656 
657         if (cpu_dai->driver->ops->shutdown)
658                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
659 out:
660         mutex_unlock(&rtd->pcm_mutex);
661 
662         for_each_rtdcom(rtd, rtdcom) {
663                 component = rtdcom->component;
664 
665                 pm_runtime_mark_last_busy(component->dev);
666                 pm_runtime_put_autosuspend(component->dev);
667         }
668 
669         for_each_rtd_codec_dai(rtd, i, codec_dai) {
670                 if (!codec_dai->active)
671                         pinctrl_pm_select_sleep_state(codec_dai->dev);
672         }
673         if (!cpu_dai->active)
674                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
675 
676         return ret;
677 }
678 
679 /*
680  * Power down the audio subsystem pmdown_time msecs after close is called.
681  * This is to ensure there are no pops or clicks in between any music tracks
682  * due to DAPM power cycling.
683  */
684 static void close_delayed_work(struct work_struct *work)
685 {
686         struct snd_soc_pcm_runtime *rtd =
687                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
688         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
689 
690         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
691 
692         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
693                  codec_dai->driver->playback.stream_name,
694                  codec_dai->playback_active ? "active" : "inactive",
695                  rtd->pop_wait ? "yes" : "no");
696 
697         /* are we waiting on this codec DAI stream */
698         if (rtd->pop_wait == 1) {
699                 rtd->pop_wait = 0;
700                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
701                                           SND_SOC_DAPM_STREAM_STOP);
702         }
703 
704         mutex_unlock(&rtd->pcm_mutex);
705 }
706 
707 /*
708  * Called by ALSA when a PCM substream is closed. Private data can be
709  * freed here. The cpu DAI, codec DAI, machine and components are also
710  * shutdown.
711  */
712 static int soc_pcm_close(struct snd_pcm_substream *substream)
713 {
714         struct snd_soc_pcm_runtime *rtd = substream->private_data;
715         struct snd_soc_component *component;
716         struct snd_soc_rtdcom_list *rtdcom;
717         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
718         struct snd_soc_dai *codec_dai;
719         int i;
720 
721         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
722 
723         snd_soc_runtime_deactivate(rtd, substream->stream);
724 
725         /* clear the corresponding DAIs rate when inactive */
726         if (!cpu_dai->active)
727                 cpu_dai->rate = 0;
728 
729         for_each_rtd_codec_dai(rtd, i, codec_dai) {
730                 if (!codec_dai->active)
731                         codec_dai->rate = 0;
732         }
733 
734         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
735 
736         if (cpu_dai->driver->ops->shutdown)
737                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
738 
739         for_each_rtd_codec_dai(rtd, i, codec_dai) {
740                 if (codec_dai->driver->ops->shutdown)
741                         codec_dai->driver->ops->shutdown(substream, codec_dai);
742         }
743 
744         if (rtd->dai_link->ops->shutdown)
745                 rtd->dai_link->ops->shutdown(substream);
746 
747         soc_pcm_components_close(substream, NULL);
748 
749         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
750                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
751                         /* powered down playback stream now */
752                         snd_soc_dapm_stream_event(rtd,
753                                                   SNDRV_PCM_STREAM_PLAYBACK,
754                                                   SND_SOC_DAPM_STREAM_STOP);
755                 } else {
756                         /* start delayed pop wq here for playback streams */
757                         rtd->pop_wait = 1;
758                         queue_delayed_work(system_power_efficient_wq,
759                                            &rtd->delayed_work,
760                                            msecs_to_jiffies(rtd->pmdown_time));
761                 }
762         } else {
763                 /* capture streams can be powered down now */
764                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
765                                           SND_SOC_DAPM_STREAM_STOP);
766         }
767 
768         mutex_unlock(&rtd->pcm_mutex);
769 
770         for_each_rtdcom(rtd, rtdcom) {
771                 component = rtdcom->component;
772 
773                 pm_runtime_mark_last_busy(component->dev);
774                 pm_runtime_put_autosuspend(component->dev);
775         }
776 
777         for_each_rtd_codec_dai(rtd, i, codec_dai) {
778                 if (!codec_dai->active)
779                         pinctrl_pm_select_sleep_state(codec_dai->dev);
780         }
781         if (!cpu_dai->active)
782                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
783 
784         return 0;
785 }
786 
787 /*
788  * Called by ALSA when the PCM substream is prepared, can set format, sample
789  * rate, etc.  This function is non atomic and can be called multiple times,
790  * it can refer to the runtime info.
791  */
792 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
793 {
794         struct snd_soc_pcm_runtime *rtd = substream->private_data;
795         struct snd_soc_component *component;
796         struct snd_soc_rtdcom_list *rtdcom;
797         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
798         struct snd_soc_dai *codec_dai;
799         int i, ret = 0;
800 
801         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
802 
803         if (rtd->dai_link->ops->prepare) {
804                 ret = rtd->dai_link->ops->prepare(substream);
805                 if (ret < 0) {
806                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
807                                 " %d\n", ret);
808                         goto out;
809                 }
810         }
811 
812         for_each_rtdcom(rtd, rtdcom) {
813                 component = rtdcom->component;
814 
815                 if (!component->driver->ops ||
816                     !component->driver->ops->prepare)
817                         continue;
818 
819                 ret = component->driver->ops->prepare(substream);
820                 if (ret < 0) {
821                         dev_err(component->dev,
822                                 "ASoC: platform prepare error: %d\n", ret);
823                         goto out;
824                 }
825         }
826 
827         for_each_rtd_codec_dai(rtd, i, codec_dai) {
828                 if (codec_dai->driver->ops->prepare) {
829                         ret = codec_dai->driver->ops->prepare(substream,
830                                                               codec_dai);
831                         if (ret < 0) {
832                                 dev_err(codec_dai->dev,
833                                         "ASoC: codec DAI prepare error: %d\n",
834                                         ret);
835                                 goto out;
836                         }
837                 }
838         }
839 
840         if (cpu_dai->driver->ops->prepare) {
841                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
842                 if (ret < 0) {
843                         dev_err(cpu_dai->dev,
844                                 "ASoC: cpu DAI prepare error: %d\n", ret);
845                         goto out;
846                 }
847         }
848 
849         /* cancel any delayed stream shutdown that is pending */
850         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
851             rtd->pop_wait) {
852                 rtd->pop_wait = 0;
853                 cancel_delayed_work(&rtd->delayed_work);
854         }
855 
856         snd_soc_dapm_stream_event(rtd, substream->stream,
857                         SND_SOC_DAPM_STREAM_START);
858 
859         for_each_rtd_codec_dai(rtd, i, codec_dai)
860                 snd_soc_dai_digital_mute(codec_dai, 0,
861                                          substream->stream);
862         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
863 
864 out:
865         mutex_unlock(&rtd->pcm_mutex);
866         return ret;
867 }
868 
869 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
870                                        unsigned int mask)
871 {
872         struct snd_interval *interval;
873         int channels = hweight_long(mask);
874 
875         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
876         interval->min = channels;
877         interval->max = channels;
878 }
879 
880 int soc_dai_hw_params(struct snd_pcm_substream *substream,
881                       struct snd_pcm_hw_params *params,
882                       struct snd_soc_dai *dai)
883 {
884         struct snd_soc_pcm_runtime *rtd = substream->private_data;
885         int ret;
886 
887         /* perform any topology hw_params fixups before DAI  */
888         if (rtd->dai_link->be_hw_params_fixup) {
889                 ret = rtd->dai_link->be_hw_params_fixup(rtd, params);
890                 if (ret < 0) {
891                         dev_err(rtd->dev,
892                                 "ASoC: hw_params topology fixup failed %d\n",
893                                 ret);
894                         return ret;
895                 }
896         }
897 
898         if (dai->driver->ops->hw_params) {
899                 ret = dai->driver->ops->hw_params(substream, params, dai);
900                 if (ret < 0) {
901                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
902                                 dai->name, ret);
903                         return ret;
904                 }
905         }
906 
907         return 0;
908 }
909 
910 static int soc_pcm_components_hw_free(struct snd_pcm_substream *substream,
911                                       struct snd_soc_component *last)
912 {
913         struct snd_soc_pcm_runtime *rtd = substream->private_data;
914         struct snd_soc_rtdcom_list *rtdcom;
915         struct snd_soc_component *component;
916 
917         for_each_rtdcom(rtd, rtdcom) {
918                 component = rtdcom->component;
919 
920                 if (component == last)
921                         break;
922 
923                 if (!component->driver->ops ||
924                     !component->driver->ops->hw_free)
925                         continue;
926 
927                 component->driver->ops->hw_free(substream);
928         }
929 
930         return 0;
931 }
932 
933 /*
934  * Called by ALSA when the hardware params are set by application. This
935  * function can also be called multiple times and can allocate buffers
936  * (using snd_pcm_lib_* ). It's non-atomic.
937  */
938 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
939                                 struct snd_pcm_hw_params *params)
940 {
941         struct snd_soc_pcm_runtime *rtd = substream->private_data;
942         struct snd_soc_component *component;
943         struct snd_soc_rtdcom_list *rtdcom;
944         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
945         struct snd_soc_dai *codec_dai;
946         int i, ret = 0;
947 
948         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
949         if (rtd->dai_link->ops->hw_params) {
950                 ret = rtd->dai_link->ops->hw_params(substream, params);
951                 if (ret < 0) {
952                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
953                                 " failed: %d\n", ret);
954                         goto out;
955                 }
956         }
957 
958         for_each_rtd_codec_dai(rtd, i, codec_dai) {
959                 struct snd_pcm_hw_params codec_params;
960 
961                 /*
962                  * Skip CODECs which don't support the current stream type,
963                  * the idea being that if a CODEC is not used for the currently
964                  * set up transfer direction, it should not need to be
965                  * configured, especially since the configuration used might
966                  * not even be supported by that CODEC. There may be cases
967                  * however where a CODEC needs to be set up although it is
968                  * actually not being used for the transfer, e.g. if a
969                  * capture-only CODEC is acting as an LRCLK and/or BCLK master
970                  * for the DAI link including a playback-only CODEC.
971                  * If this becomes necessary, we will have to augment the
972                  * machine driver setup with information on how to act, so
973                  * we can do the right thing here.
974                  */
975                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
976                         continue;
977 
978                 /* copy params for each codec */
979                 codec_params = *params;
980 
981                 /* fixup params based on TDM slot masks */
982                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
983                     codec_dai->tx_mask)
984                         soc_pcm_codec_params_fixup(&codec_params,
985                                                    codec_dai->tx_mask);
986 
987                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
988                     codec_dai->rx_mask)
989                         soc_pcm_codec_params_fixup(&codec_params,
990                                                    codec_dai->rx_mask);
991 
992                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
993                 if(ret < 0)
994                         goto codec_err;
995 
996                 codec_dai->rate = params_rate(&codec_params);
997                 codec_dai->channels = params_channels(&codec_params);
998                 codec_dai->sample_bits = snd_pcm_format_physical_width(
999                                                 params_format(&codec_params));
1000 
1001                 snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1002         }
1003 
1004         ret = soc_dai_hw_params(substream, params, cpu_dai);
1005         if (ret < 0)
1006                 goto interface_err;
1007 
1008         /* store the parameters for each DAIs */
1009         cpu_dai->rate = params_rate(params);
1010         cpu_dai->channels = params_channels(params);
1011         cpu_dai->sample_bits =
1012                 snd_pcm_format_physical_width(params_format(params));
1013 
1014         snd_soc_dapm_update_dai(substream, params, cpu_dai);
1015 
1016         for_each_rtdcom(rtd, rtdcom) {
1017                 component = rtdcom->component;
1018 
1019                 if (!component->driver->ops ||
1020                     !component->driver->ops->hw_params)
1021                         continue;
1022 
1023                 ret = component->driver->ops->hw_params(substream, params);
1024                 if (ret < 0) {
1025                         dev_err(component->dev,
1026                                 "ASoC: %s hw params failed: %d\n",
1027                                 component->name, ret);
1028                         goto component_err;
1029                 }
1030         }
1031         component = NULL;
1032 
1033         ret = soc_pcm_params_symmetry(substream, params);
1034         if (ret)
1035                 goto component_err;
1036 out:
1037         mutex_unlock(&rtd->pcm_mutex);
1038         return ret;
1039 
1040 component_err:
1041         soc_pcm_components_hw_free(substream, component);
1042 
1043         if (cpu_dai->driver->ops->hw_free)
1044                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1045         cpu_dai->rate = 0;
1046 
1047 interface_err:
1048         i = rtd->num_codecs;
1049 
1050 codec_err:
1051         for_each_rtd_codec_dai_rollback(rtd, i, codec_dai) {
1052                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1053                         continue;
1054 
1055                 if (codec_dai->driver->ops->hw_free)
1056                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1057                 codec_dai->rate = 0;
1058         }
1059 
1060         if (rtd->dai_link->ops->hw_free)
1061                 rtd->dai_link->ops->hw_free(substream);
1062 
1063         mutex_unlock(&rtd->pcm_mutex);
1064         return ret;
1065 }
1066 
1067 /*
1068  * Frees resources allocated by hw_params, can be called multiple times
1069  */
1070 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
1071 {
1072         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1073         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1074         struct snd_soc_dai *codec_dai;
1075         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1076         int i;
1077 
1078         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
1079 
1080         /* clear the corresponding DAIs parameters when going to be inactive */
1081         if (cpu_dai->active == 1) {
1082                 cpu_dai->rate = 0;
1083                 cpu_dai->channels = 0;
1084                 cpu_dai->sample_bits = 0;
1085         }
1086 
1087         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1088                 if (codec_dai->active == 1) {
1089                         codec_dai->rate = 0;
1090                         codec_dai->channels = 0;
1091                         codec_dai->sample_bits = 0;
1092                 }
1093         }
1094 
1095         /* apply codec digital mute */
1096         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1097                 if ((playback && codec_dai->playback_active == 1) ||
1098                     (!playback && codec_dai->capture_active == 1))
1099                         snd_soc_dai_digital_mute(codec_dai, 1,
1100                                                  substream->stream);
1101         }
1102 
1103         /* free any machine hw params */
1104         if (rtd->dai_link->ops->hw_free)
1105                 rtd->dai_link->ops->hw_free(substream);
1106 
1107         /* free any component resources */
1108         soc_pcm_components_hw_free(substream, NULL);
1109 
1110         /* now free hw params for the DAIs  */
1111         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1112                 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1113                         continue;
1114 
1115                 if (codec_dai->driver->ops->hw_free)
1116                         codec_dai->driver->ops->hw_free(substream, codec_dai);
1117         }
1118 
1119         if (cpu_dai->driver->ops->hw_free)
1120                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1121 
1122         mutex_unlock(&rtd->pcm_mutex);
1123         return 0;
1124 }
1125 
1126 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1127 {
1128         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1129         struct snd_soc_component *component;
1130         struct snd_soc_rtdcom_list *rtdcom;
1131         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1132         struct snd_soc_dai *codec_dai;
1133         int i, ret;
1134 
1135         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1136                 if (codec_dai->driver->ops->trigger) {
1137                         ret = codec_dai->driver->ops->trigger(substream,
1138                                                               cmd, codec_dai);
1139                         if (ret < 0)
1140                                 return ret;
1141                 }
1142         }
1143 
1144         for_each_rtdcom(rtd, rtdcom) {
1145                 component = rtdcom->component;
1146 
1147                 if (!component->driver->ops ||
1148                     !component->driver->ops->trigger)
1149                         continue;
1150 
1151                 ret = component->driver->ops->trigger(substream, cmd);
1152                 if (ret < 0)
1153                         return ret;
1154         }
1155 
1156         if (cpu_dai->driver->ops->trigger) {
1157                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1158                 if (ret < 0)
1159                         return ret;
1160         }
1161 
1162         if (rtd->dai_link->ops->trigger) {
1163                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1164                 if (ret < 0)
1165                         return ret;
1166         }
1167 
1168         return 0;
1169 }
1170 
1171 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1172                                    int cmd)
1173 {
1174         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1175         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1176         struct snd_soc_dai *codec_dai;
1177         int i, ret;
1178 
1179         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1180                 if (codec_dai->driver->ops->bespoke_trigger) {
1181                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1182                                                                 cmd, codec_dai);
1183                         if (ret < 0)
1184                                 return ret;
1185                 }
1186         }
1187 
1188         if (cpu_dai->driver->ops->bespoke_trigger) {
1189                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1190                 if (ret < 0)
1191                         return ret;
1192         }
1193         return 0;
1194 }
1195 /*
1196  * soc level wrapper for pointer callback
1197  * If cpu_dai, codec_dai, component driver has the delay callback, then
1198  * the runtime->delay will be updated accordingly.
1199  */
1200 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1201 {
1202         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1203         struct snd_soc_component *component;
1204         struct snd_soc_rtdcom_list *rtdcom;
1205         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1206         struct snd_soc_dai *codec_dai;
1207         struct snd_pcm_runtime *runtime = substream->runtime;
1208         snd_pcm_uframes_t offset = 0;
1209         snd_pcm_sframes_t delay = 0;
1210         snd_pcm_sframes_t codec_delay = 0;
1211         int i;
1212 
1213         /* clearing the previous total delay */
1214         runtime->delay = 0;
1215 
1216         for_each_rtdcom(rtd, rtdcom) {
1217                 component = rtdcom->component;
1218 
1219                 if (!component->driver->ops ||
1220                     !component->driver->ops->pointer)
1221                         continue;
1222 
1223                 /* FIXME: use 1st pointer */
1224                 offset = component->driver->ops->pointer(substream);
1225                 break;
1226         }
1227         /* base delay if assigned in pointer callback */
1228         delay = runtime->delay;
1229 
1230         if (cpu_dai->driver->ops->delay)
1231                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1232 
1233         for_each_rtd_codec_dai(rtd, i, codec_dai) {
1234                 if (codec_dai->driver->ops->delay)
1235                         codec_delay = max(codec_delay,
1236                                         codec_dai->driver->ops->delay(substream,
1237                                                                     codec_dai));
1238         }
1239         delay += codec_delay;
1240 
1241         runtime->delay = delay;
1242 
1243         return offset;
1244 }
1245 
1246 /* connect a FE and BE */
1247 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1248                 struct snd_soc_pcm_runtime *be, int stream)
1249 {
1250         struct snd_soc_dpcm *dpcm;
1251         unsigned long flags;
1252 
1253         /* only add new dpcms */
1254         for_each_dpcm_be(fe, stream, dpcm) {
1255                 if (dpcm->be == be && dpcm->fe == fe)
1256                         return 0;
1257         }
1258 
1259         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1260         if (!dpcm)
1261                 return -ENOMEM;
1262 
1263         dpcm->be = be;
1264         dpcm->fe = fe;
1265         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1266         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1267         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1268         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1269         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1270         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1271 
1272         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1273                         stream ? "capture" : "playback",  fe->dai_link->name,
1274                         stream ? "<-" : "->", be->dai_link->name);
1275 
1276 #ifdef CONFIG_DEBUG_FS
1277         if (fe->debugfs_dpcm_root)
1278                 dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1279                                 fe->debugfs_dpcm_root, &dpcm->state);
1280 #endif
1281         return 1;
1282 }
1283 
1284 /* reparent a BE onto another FE */
1285 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1286                         struct snd_soc_pcm_runtime *be, int stream)
1287 {
1288         struct snd_soc_dpcm *dpcm;
1289         struct snd_pcm_substream *fe_substream, *be_substream;
1290 
1291         /* reparent if BE is connected to other FEs */
1292         if (!be->dpcm[stream].users)
1293                 return;
1294 
1295         be_substream = snd_soc_dpcm_get_substream(be, stream);
1296 
1297         for_each_dpcm_fe(be, stream, dpcm) {
1298                 if (dpcm->fe == fe)
1299                         continue;
1300 
1301                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1302                         stream ? "capture" : "playback",
1303                         dpcm->fe->dai_link->name,
1304                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1305 
1306                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1307                 be_substream->runtime = fe_substream->runtime;
1308                 break;
1309         }
1310 }
1311 
1312 /* disconnect a BE and FE */
1313 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1314 {
1315         struct snd_soc_dpcm *dpcm, *d;
1316         unsigned long flags;
1317 
1318         for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1319                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1320                                 stream ? "capture" : "playback",
1321                                 dpcm->be->dai_link->name);
1322 
1323                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1324                         continue;
1325 
1326                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1327                         stream ? "capture" : "playback", fe->dai_link->name,
1328                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1329 
1330                 /* BEs still alive need new FE */
1331                 dpcm_be_reparent(fe, dpcm->be, stream);
1332 
1333 #ifdef CONFIG_DEBUG_FS
1334                 debugfs_remove(dpcm->debugfs_state);
1335 #endif
1336                 spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1337                 list_del(&dpcm->list_be);
1338                 list_del(&dpcm->list_fe);
1339                 spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1340                 kfree(dpcm);
1341         }
1342 }
1343 
1344 /* get BE for DAI widget and stream */
1345 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1346                 struct snd_soc_dapm_widget *widget, int stream)
1347 {
1348         struct snd_soc_pcm_runtime *be;
1349         struct snd_soc_dai *dai;
1350         int i;
1351 
1352         dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1353 
1354         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1355                 for_each_card_rtds(card, be) {
1356 
1357                         if (!be->dai_link->no_pcm)
1358                                 continue;
1359 
1360                         dev_dbg(card->dev, "ASoC: try BE : %s\n",
1361                                 be->cpu_dai->playback_widget ?
1362                                 be->cpu_dai->playback_widget->name : "(not set)");
1363 
1364                         if (be->cpu_dai->playback_widget == widget)
1365                                 return be;
1366 
1367                         for_each_rtd_codec_dai(be, i, dai) {
1368                                 if (dai->playback_widget == widget)
1369                                         return be;
1370                         }
1371                 }
1372         } else {
1373 
1374                 for_each_card_rtds(card, be) {
1375 
1376                         if (!be->dai_link->no_pcm)
1377                                 continue;
1378 
1379                         dev_dbg(card->dev, "ASoC: try BE %s\n",
1380                                 be->cpu_dai->capture_widget ?
1381                                 be->cpu_dai->capture_widget->name : "(not set)");
1382 
1383                         if (be->cpu_dai->capture_widget == widget)
1384                                 return be;
1385 
1386                         for_each_rtd_codec_dai(be, i, dai) {
1387                                 if (dai->capture_widget == widget)
1388                                         return be;
1389                         }
1390                 }
1391         }
1392 
1393         /* dai link name and stream name set correctly ? */
1394         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1395                 stream ? "capture" : "playback", widget->name);
1396         return NULL;
1397 }
1398 
1399 static inline struct snd_soc_dapm_widget *
1400         dai_get_widget(struct snd_soc_dai *dai, int stream)
1401 {
1402         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1403                 return dai->playback_widget;
1404         else
1405                 return dai->capture_widget;
1406 }
1407 
1408 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1409                 struct snd_soc_dapm_widget *widget)
1410 {
1411         int i;
1412 
1413         for (i = 0; i < list->num_widgets; i++) {
1414                 if (widget == list->widgets[i])
1415                         return 1;
1416         }
1417 
1418         return 0;
1419 }
1420 
1421 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1422                 enum snd_soc_dapm_direction dir)
1423 {
1424         struct snd_soc_card *card = widget->dapm->card;
1425         struct snd_soc_pcm_runtime *rtd;
1426         struct snd_soc_dai *dai;
1427         int i;
1428 
1429         if (dir == SND_SOC_DAPM_DIR_OUT) {
1430                 for_each_card_rtds(card, rtd) {
1431                         if (!rtd->dai_link->no_pcm)
1432                                 continue;
1433 
1434                         if (rtd->cpu_dai->playback_widget == widget)
1435                                 return true;
1436 
1437                         for_each_rtd_codec_dai(rtd, i, dai) {
1438                                 if (dai->playback_widget == widget)
1439                                         return true;
1440                         }
1441                 }
1442         } else { /* SND_SOC_DAPM_DIR_IN */
1443                 for_each_card_rtds(card, rtd) {
1444                         if (!rtd->dai_link->no_pcm)
1445                                 continue;
1446 
1447                         if (rtd->cpu_dai->capture_widget == widget)
1448                                 return true;
1449 
1450                         for_each_rtd_codec_dai(rtd, i, dai) {
1451                                 if (dai->capture_widget == widget)
1452                                         return true;
1453                         }
1454                 }
1455         }
1456 
1457         return false;
1458 }
1459 
1460 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1461         int stream, struct snd_soc_dapm_widget_list **list)
1462 {
1463         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1464         int paths;
1465 
1466         /* get number of valid DAI paths and their widgets */
1467         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1468                         dpcm_end_walk_at_be);
1469 
1470         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1471                         stream ? "capture" : "playback");
1472 
1473         return paths;
1474 }
1475 
1476 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1477         struct snd_soc_dapm_widget_list **list_)
1478 {
1479         struct snd_soc_dpcm *dpcm;
1480         struct snd_soc_dapm_widget_list *list = *list_;
1481         struct snd_soc_dapm_widget *widget;
1482         struct snd_soc_dai *dai;
1483         int prune = 0;
1484 
1485         /* Destroy any old FE <--> BE connections */
1486         for_each_dpcm_be(fe, stream, dpcm) {
1487                 unsigned int i;
1488 
1489                 /* is there a valid CPU DAI widget for this BE */
1490                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1491 
1492                 /* prune the BE if it's no longer in our active list */
1493                 if (widget && widget_in_list(list, widget))
1494                         continue;
1495 
1496                 /* is there a valid CODEC DAI widget for this BE */
1497                 for_each_rtd_codec_dai(dpcm->be, i, dai) {
1498                         widget = dai_get_widget(dai, stream);
1499 
1500                         /* prune the BE if it's no longer in our active list */
1501                         if (widget && widget_in_list(list, widget))
1502                                 continue;
1503                 }
1504 
1505                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1506                         stream ? "capture" : "playback",
1507                         dpcm->be->dai_link->name, fe->dai_link->name);
1508                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1509                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1510                 prune++;
1511         }
1512 
1513         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1514         return prune;
1515 }
1516 
1517 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1518         struct snd_soc_dapm_widget_list **list_)
1519 {
1520         struct snd_soc_card *card = fe->card;
1521         struct snd_soc_dapm_widget_list *list = *list_;
1522         struct snd_soc_pcm_runtime *be;
1523         int i, new = 0, err;
1524 
1525         /* Create any new FE <--> BE connections */
1526         for (i = 0; i < list->num_widgets; i++) {
1527 
1528                 switch (list->widgets[i]->id) {
1529                 case snd_soc_dapm_dai_in:
1530                         if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1531                                 continue;
1532                         break;
1533                 case snd_soc_dapm_dai_out:
1534                         if (stream != SNDRV_PCM_STREAM_CAPTURE)
1535                                 continue;
1536                         break;
1537                 default:
1538                         continue;
1539                 }
1540 
1541                 /* is there a valid BE rtd for this widget */
1542                 be = dpcm_get_be(card, list->widgets[i], stream);
1543                 if (!be) {
1544                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1545                                         list->widgets[i]->name);
1546                         continue;
1547                 }
1548 
1549                 /* make sure BE is a real BE */
1550                 if (!be->dai_link->no_pcm)
1551                         continue;
1552 
1553                 /* don't connect if FE is not running */
1554                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1555                         continue;
1556 
1557                 /* newly connected FE and BE */
1558                 err = dpcm_be_connect(fe, be, stream);
1559                 if (err < 0) {
1560                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1561                                 list->widgets[i]->name);
1562                         break;
1563                 } else if (err == 0) /* already connected */
1564                         continue;
1565 
1566                 /* new */
1567                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1568                 new++;
1569         }
1570 
1571         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1572         return new;
1573 }
1574 
1575 /*
1576  * Find the corresponding BE DAIs that source or sink audio to this
1577  * FE substream.
1578  */
1579 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1580         int stream, struct snd_soc_dapm_widget_list **list, int new)
1581 {
1582         if (new)
1583                 return dpcm_add_paths(fe, stream, list);
1584         else
1585                 return dpcm_prune_paths(fe, stream, list);
1586 }
1587 
1588 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1589 {
1590         struct snd_soc_dpcm *dpcm;
1591         unsigned long flags;
1592 
1593         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
1594         for_each_dpcm_be(fe, stream, dpcm)
1595                 dpcm->be->dpcm[stream].runtime_update =
1596                                                 SND_SOC_DPCM_UPDATE_NO;
1597         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
1598 }
1599 
1600 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1601         int stream)
1602 {
1603         struct snd_soc_dpcm *dpcm;
1604 
1605         /* disable any enabled and non active backends */
1606         for_each_dpcm_be(fe, stream, dpcm) {
1607 
1608                 struct snd_soc_pcm_runtime *be = dpcm->be;
1609                 struct snd_pcm_substream *be_substream =
1610                         snd_soc_dpcm_get_substream(be, stream);
1611 
1612                 if (be->dpcm[stream].users == 0)
1613                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1614                                 stream ? "capture" : "playback",
1615                                 be->dpcm[stream].state);
1616 
1617                 if (--be->dpcm[stream].users != 0)
1618                         continue;
1619 
1620                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1621                         continue;
1622 
1623                 soc_pcm_close(be_substream);
1624                 be_substream->runtime = NULL;
1625                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1626         }
1627 }
1628 
1629 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1630 {
1631         struct snd_soc_dpcm *dpcm;
1632         int err, count = 0;
1633 
1634         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1635         for_each_dpcm_be(fe, stream, dpcm) {
1636 
1637                 struct snd_soc_pcm_runtime *be = dpcm->be;
1638                 struct snd_pcm_substream *be_substream =
1639                         snd_soc_dpcm_get_substream(be, stream);
1640 
1641                 if (!be_substream) {
1642                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1643                                 stream ? "capture" : "playback");
1644                         continue;
1645                 }
1646 
1647                 /* is this op for this BE ? */
1648                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1649                         continue;
1650 
1651                 /* first time the dpcm is open ? */
1652                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1653                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1654                                 stream ? "capture" : "playback",
1655                                 be->dpcm[stream].state);
1656 
1657                 if (be->dpcm[stream].users++ != 0)
1658                         continue;
1659 
1660                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1661                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1662                         continue;
1663 
1664                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1665                         stream ? "capture" : "playback", be->dai_link->name);
1666 
1667                 be_substream->runtime = be->dpcm[stream].runtime;
1668                 err = soc_pcm_open(be_substream);
1669                 if (err < 0) {
1670                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1671                         be->dpcm[stream].users--;
1672                         if (be->dpcm[stream].users < 0)
1673                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1674                                         stream ? "capture" : "playback",
1675                                         be->dpcm[stream].state);
1676 
1677                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1678                         goto unwind;
1679                 }
1680 
1681                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1682                 count++;
1683         }
1684 
1685         return count;
1686 
1687 unwind:
1688         /* disable any enabled and non active backends */
1689         for_each_dpcm_be_rollback(fe, stream, dpcm) {
1690                 struct snd_soc_pcm_runtime *be = dpcm->be;
1691                 struct snd_pcm_substream *be_substream =
1692                         snd_soc_dpcm_get_substream(be, stream);
1693 
1694                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1695                         continue;
1696 
1697                 if (be->dpcm[stream].users == 0)
1698                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1699                                 stream ? "capture" : "playback",
1700                                 be->dpcm[stream].state);
1701 
1702                 if (--be->dpcm[stream].users != 0)
1703                         continue;
1704 
1705                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1706                         continue;
1707 
1708                 soc_pcm_close(be_substream);
1709                 be_substream->runtime = NULL;
1710                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1711         }
1712 
1713         return err;
1714 }
1715 
1716 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1717                                  struct snd_soc_pcm_stream *stream)
1718 {
1719         runtime->hw.rate_min = stream->rate_min;
1720         runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1721         runtime->hw.channels_min = stream->channels_min;
1722         runtime->hw.channels_max = stream->channels_max;
1723         if (runtime->hw.formats)
1724                 runtime->hw.formats &= stream->formats;
1725         else
1726                 runtime->hw.formats = stream->formats;
1727         runtime->hw.rates = stream->rates;
1728 }
1729 
1730 static void dpcm_runtime_merge_format(struct snd_pcm_substream *substream,
1731                                       u64 *formats)
1732 {
1733         struct snd_soc_pcm_runtime *fe = substream->private_data;
1734         struct snd_soc_dpcm *dpcm;
1735         struct snd_soc_dai *dai;
1736         int stream = substream->stream;
1737 
1738         if (!fe->dai_link->dpcm_merged_format)
1739                 return;
1740 
1741         /*
1742          * It returns merged BE codec format
1743          * if FE want to use it (= dpcm_merged_format)
1744          */
1745 
1746         for_each_dpcm_be(fe, stream, dpcm) {
1747                 struct snd_soc_pcm_runtime *be = dpcm->be;
1748                 struct snd_soc_dai_driver *codec_dai_drv;
1749                 struct snd_soc_pcm_stream *codec_stream;
1750                 int i;
1751 
1752                 for_each_rtd_codec_dai(be, i, dai) {
1753                         /*
1754                          * Skip CODECs which don't support the current stream
1755                          * type. See soc_pcm_init_runtime_hw() for more details
1756                          */
1757                         if (!snd_soc_dai_stream_valid(dai, stream))
1758                                 continue;
1759 
1760                         codec_dai_drv = dai->driver;
1761                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1762                                 codec_stream = &codec_dai_drv->playback;
1763                         else
1764                                 codec_stream = &codec_dai_drv->capture;
1765 
1766                         *formats &= codec_stream->formats;
1767                 }
1768         }
1769 }
1770 
1771 static void dpcm_runtime_merge_chan(struct snd_pcm_substream *substream,
1772                                     unsigned int *channels_min,
1773                                     unsigned int *channels_max)
1774 {
1775         struct snd_soc_pcm_runtime *fe = substream->private_data;
1776         struct snd_soc_dpcm *dpcm;
1777         int stream = substream->stream;
1778 
1779         if (!fe->dai_link->dpcm_merged_chan)
1780                 return;
1781 
1782         /*
1783          * It returns merged BE codec channel;
1784          * if FE want to use it (= dpcm_merged_chan)
1785          */
1786 
1787         for_each_dpcm_be(fe, stream, dpcm) {
1788                 struct snd_soc_pcm_runtime *be = dpcm->be;
1789                 struct snd_soc_dai_driver *cpu_dai_drv =  be->cpu_dai->driver;
1790                 struct snd_soc_dai_driver *codec_dai_drv;
1791                 struct snd_soc_pcm_stream *codec_stream;
1792                 struct snd_soc_pcm_stream *cpu_stream;
1793 
1794                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1795                         cpu_stream = &cpu_dai_drv->playback;
1796                 else
1797                         cpu_stream = &cpu_dai_drv->capture;
1798 
1799                 *channels_min = max(*channels_min, cpu_stream->channels_min);
1800                 *channels_max = min(*channels_max, cpu_stream->channels_max);
1801 
1802                 /*
1803                  * chan min/max cannot be enforced if there are multiple CODEC
1804                  * DAIs connected to a single CPU DAI, use CPU DAI's directly
1805                  */
1806                 if (be->num_codecs == 1) {
1807                         codec_dai_drv = be->codec_dais[0]->driver;
1808 
1809                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1810                                 codec_stream = &codec_dai_drv->playback;
1811                         else
1812                                 codec_stream = &codec_dai_drv->capture;
1813 
1814                         *channels_min = max(*channels_min,
1815                                             codec_stream->channels_min);
1816                         *channels_max = min(*channels_max,
1817                                             codec_stream->channels_max);
1818                 }
1819         }
1820 }
1821 
1822 static void dpcm_runtime_merge_rate(struct snd_pcm_substream *substream,
1823                                     unsigned int *rates,
1824                                     unsigned int *rate_min,
1825                                     unsigned int *rate_max)
1826 {
1827         struct snd_soc_pcm_runtime *fe = substream->private_data;
1828         struct snd_soc_dpcm *dpcm;
1829         int stream = substream->stream;
1830 
1831         if (!fe->dai_link->dpcm_merged_rate)
1832                 return;
1833 
1834         /*
1835          * It returns merged BE codec channel;
1836          * if FE want to use it (= dpcm_merged_chan)
1837          */
1838 
1839         for_each_dpcm_be(fe, stream, dpcm) {
1840                 struct snd_soc_pcm_runtime *be = dpcm->be;
1841                 struct snd_soc_dai_driver *cpu_dai_drv =  be->cpu_dai->driver;
1842                 struct snd_soc_dai_driver *codec_dai_drv;
1843                 struct snd_soc_pcm_stream *codec_stream;
1844                 struct snd_soc_pcm_stream *cpu_stream;
1845                 struct snd_soc_dai *dai;
1846                 int i;
1847 
1848                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1849                         cpu_stream = &cpu_dai_drv->playback;
1850                 else
1851                         cpu_stream = &cpu_dai_drv->capture;
1852 
1853                 *rate_min = max(*rate_min, cpu_stream->rate_min);
1854                 *rate_max = min_not_zero(*rate_max, cpu_stream->rate_max);
1855                 *rates = snd_pcm_rate_mask_intersect(*rates, cpu_stream->rates);
1856 
1857                 for_each_rtd_codec_dai(be, i, dai) {
1858                         /*
1859                          * Skip CODECs which don't support the current stream
1860                          * type. See soc_pcm_init_runtime_hw() for more details
1861                          */
1862                         if (!snd_soc_dai_stream_valid(dai, stream))
1863                                 continue;
1864 
1865                         codec_dai_drv = dai->driver;
1866                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1867                                 codec_stream = &codec_dai_drv->playback;
1868                         else
1869                                 codec_stream = &codec_dai_drv->capture;
1870 
1871                         *rate_min = max(*rate_min, codec_stream->rate_min);
1872                         *rate_max = min_not_zero(*rate_max,
1873                                                  codec_stream->rate_max);
1874                         *rates = snd_pcm_rate_mask_intersect(*rates,
1875                                                 codec_stream->rates);
1876                 }
1877         }
1878 }
1879 
1880 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1881 {
1882         struct snd_pcm_runtime *runtime = substream->runtime;
1883         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1884         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1885         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1886 
1887         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1888                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1889         else
1890                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1891 
1892         dpcm_runtime_merge_format(substream, &runtime->hw.formats);
1893         dpcm_runtime_merge_chan(substream, &runtime->hw.channels_min,
1894                                 &runtime->hw.channels_max);
1895         dpcm_runtime_merge_rate(substream, &runtime->hw.rates,
1896                                 &runtime->hw.rate_min, &runtime->hw.rate_max);
1897 }
1898 
1899 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1900 
1901 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1902  * for avoiding the race with trigger callback.
1903  * If the state is unset and a trigger is pending while the previous operation,
1904  * process the pending trigger action here.
1905  */
1906 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1907                                      int stream, enum snd_soc_dpcm_update state)
1908 {
1909         struct snd_pcm_substream *substream =
1910                 snd_soc_dpcm_get_substream(fe, stream);
1911 
1912         snd_pcm_stream_lock_irq(substream);
1913         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1914                 dpcm_fe_dai_do_trigger(substream,
1915                                        fe->dpcm[stream].trigger_pending - 1);
1916                 fe->dpcm[stream].trigger_pending = 0;
1917         }
1918         fe->dpcm[stream].runtime_update = state;
1919         snd_pcm_stream_unlock_irq(substream);
1920 }
1921 
1922 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1923                                int stream)
1924 {
1925         struct snd_soc_dpcm *dpcm;
1926         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1927         struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1928         int err;
1929 
1930         /* apply symmetry for FE */
1931         if (soc_pcm_has_symmetry(fe_substream))
1932                 fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1933 
1934         /* Symmetry only applies if we've got an active stream. */
1935         if (fe_cpu_dai->active) {
1936                 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1937                 if (err < 0)
1938                         return err;
1939         }
1940 
1941         /* apply symmetry for BE */
1942         for_each_dpcm_be(fe, stream, dpcm) {
1943                 struct snd_soc_pcm_runtime *be = dpcm->be;
1944                 struct snd_pcm_substream *be_substream =
1945                         snd_soc_dpcm_get_substream(be, stream);
1946                 struct snd_soc_pcm_runtime *rtd;
1947                 struct snd_soc_dai *codec_dai;
1948                 int i;
1949 
1950                 /* A backend may not have the requested substream */
1951                 if (!be_substream)
1952                         continue;
1953 
1954                 rtd = be_substream->private_data;
1955                 if (rtd->dai_link->be_hw_params_fixup)
1956                         continue;
1957 
1958                 if (soc_pcm_has_symmetry(be_substream))
1959                         be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1960 
1961                 /* Symmetry only applies if we've got an active stream. */
1962                 if (rtd->cpu_dai->active) {
1963                         err = soc_pcm_apply_symmetry(fe_substream,
1964                                                      rtd->cpu_dai);
1965                         if (err < 0)
1966                                 return err;
1967                 }
1968 
1969                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
1970                         if (codec_dai->active) {
1971                                 err = soc_pcm_apply_symmetry(fe_substream,
1972                                                              codec_dai);
1973                                 if (err < 0)
1974                                         return err;
1975                         }
1976                 }
1977         }
1978 
1979         return 0;
1980 }
1981 
1982 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1983 {
1984         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1985         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1986         int stream = fe_substream->stream, ret = 0;
1987 
1988         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1989 
1990         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1991         if (ret < 0) {
1992                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1993                 goto be_err;
1994         }
1995 
1996         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1997 
1998         /* start the DAI frontend */
1999         ret = soc_pcm_open(fe_substream);
2000         if (ret < 0) {
2001                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
2002                 goto unwind;
2003         }
2004 
2005         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
2006 
2007         dpcm_set_fe_runtime(fe_substream);
2008         snd_pcm_limit_hw_rates(runtime);
2009 
2010         ret = dpcm_apply_symmetry(fe_substream, stream);
2011         if (ret < 0) {
2012                 dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
2013                         ret);
2014                 goto unwind;
2015         }
2016 
2017         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2018         return 0;
2019 
2020 unwind:
2021         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
2022 be_err:
2023         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2024         return ret;
2025 }
2026 
2027 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2028 {
2029         struct snd_soc_dpcm *dpcm;
2030 
2031         /* only shutdown BEs that are either sinks or sources to this FE DAI */
2032         for_each_dpcm_be(fe, stream, dpcm) {
2033 
2034                 struct snd_soc_pcm_runtime *be = dpcm->be;
2035                 struct snd_pcm_substream *be_substream =
2036                         snd_soc_dpcm_get_substream(be, stream);
2037 
2038                 /* is this op for this BE ? */
2039                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2040                         continue;
2041 
2042                 if (be->dpcm[stream].users == 0)
2043                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
2044                                 stream ? "capture" : "playback",
2045                                 be->dpcm[stream].state);
2046 
2047                 if (--be->dpcm[stream].users != 0)
2048                         continue;
2049 
2050                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2051                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
2052                         soc_pcm_hw_free(be_substream);
2053                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2054                 }
2055 
2056                 dev_dbg(be->dev, "ASoC: close BE %s\n",
2057                         be->dai_link->name);
2058 
2059                 soc_pcm_close(be_substream);
2060                 be_substream->runtime = NULL;
2061 
2062                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
2063         }
2064         return 0;
2065 }
2066 
2067 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
2068 {
2069         struct snd_soc_pcm_runtime *fe = substream->private_data;
2070         int stream = substream->stream;
2071 
2072         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2073 
2074         /* shutdown the BEs */
2075         dpcm_be_dai_shutdown(fe, substream->stream);
2076 
2077         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
2078 
2079         /* now shutdown the frontend */
2080         soc_pcm_close(substream);
2081 
2082         /* run the stream event for each BE */
2083         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
2084 
2085         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
2086         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2087         return 0;
2088 }
2089 
2090 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
2091 {
2092         struct snd_soc_dpcm *dpcm;
2093 
2094         /* only hw_params backends that are either sinks or sources
2095          * to this frontend DAI */
2096         for_each_dpcm_be(fe, stream, dpcm) {
2097 
2098                 struct snd_soc_pcm_runtime *be = dpcm->be;
2099                 struct snd_pcm_substream *be_substream =
2100                         snd_soc_dpcm_get_substream(be, stream);
2101 
2102                 /* is this op for this BE ? */
2103                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2104                         continue;
2105 
2106                 /* only free hw when no longer used - check all FEs */
2107                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2108                                 continue;
2109 
2110                 /* do not free hw if this BE is used by other FE */
2111                 if (be->dpcm[stream].users > 1)
2112                         continue;
2113 
2114                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2115                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2116                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2117                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
2118                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2119                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2120                         continue;
2121 
2122                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
2123                         be->dai_link->name);
2124 
2125                 soc_pcm_hw_free(be_substream);
2126 
2127                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2128         }
2129 
2130         return 0;
2131 }
2132 
2133 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
2134 {
2135         struct snd_soc_pcm_runtime *fe = substream->private_data;
2136         int err, stream = substream->stream;
2137 
2138         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2139         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2140 
2141         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
2142 
2143         /* call hw_free on the frontend */
2144         err = soc_pcm_hw_free(substream);
2145         if (err < 0)
2146                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
2147                         fe->dai_link->name);
2148 
2149         /* only hw_params backends that are either sinks or sources
2150          * to this frontend DAI */
2151         err = dpcm_be_dai_hw_free(fe, stream);
2152 
2153         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2154         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2155 
2156         mutex_unlock(&fe->card->mutex);
2157         return 0;
2158 }
2159 
2160 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2161 {
2162         struct snd_soc_dpcm *dpcm;
2163         int ret;
2164 
2165         for_each_dpcm_be(fe, stream, dpcm) {
2166 
2167                 struct snd_soc_pcm_runtime *be = dpcm->be;
2168                 struct snd_pcm_substream *be_substream =
2169                         snd_soc_dpcm_get_substream(be, stream);
2170 
2171                 /* is this op for this BE ? */
2172                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2173                         continue;
2174 
2175                 /* copy params for each dpcm */
2176                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
2177                                 sizeof(struct snd_pcm_hw_params));
2178 
2179                 /* perform any hw_params fixups */
2180                 if (be->dai_link->be_hw_params_fixup) {
2181                         ret = be->dai_link->be_hw_params_fixup(be,
2182                                         &dpcm->hw_params);
2183                         if (ret < 0) {
2184                                 dev_err(be->dev,
2185                                         "ASoC: hw_params BE fixup failed %d\n",
2186                                         ret);
2187                                 goto unwind;
2188                         }
2189                 }
2190 
2191                 /* copy the fixed-up hw params for BE dai */
2192                 memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
2193                        sizeof(struct snd_pcm_hw_params));
2194 
2195                 /* only allow hw_params() if no connected FEs are running */
2196                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2197                         continue;
2198 
2199                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2200                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2201                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2202                         continue;
2203 
2204                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2205                         be->dai_link->name);
2206 
2207                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
2208                 if (ret < 0) {
2209                         dev_err(dpcm->be->dev,
2210                                 "ASoC: hw_params BE failed %d\n", ret);
2211                         goto unwind;
2212                 }
2213 
2214                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2215         }
2216         return 0;
2217 
2218 unwind:
2219         /* disable any enabled and non active backends */
2220         for_each_dpcm_be_rollback(fe, stream, dpcm) {
2221                 struct snd_soc_pcm_runtime *be = dpcm->be;
2222                 struct snd_pcm_substream *be_substream =
2223                         snd_soc_dpcm_get_substream(be, stream);
2224 
2225                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2226                         continue;
2227 
2228                 /* only allow hw_free() if no connected FEs are running */
2229                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2230                         continue;
2231 
2232                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2233                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2234                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2235                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2236                         continue;
2237 
2238                 soc_pcm_hw_free(be_substream);
2239         }
2240 
2241         return ret;
2242 }
2243 
2244 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2245                                  struct snd_pcm_hw_params *params)
2246 {
2247         struct snd_soc_pcm_runtime *fe = substream->private_data;
2248         int ret, stream = substream->stream;
2249 
2250         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2251         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2252 
2253         memcpy(&fe->dpcm[substream->stream].hw_params, params,
2254                         sizeof(struct snd_pcm_hw_params));
2255         ret = dpcm_be_dai_hw_params(fe, substream->stream);
2256         if (ret < 0) {
2257                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
2258                 goto out;
2259         }
2260 
2261         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2262                         fe->dai_link->name, params_rate(params),
2263                         params_channels(params), params_format(params));
2264 
2265         /* call hw_params on the frontend */
2266         ret = soc_pcm_hw_params(substream, params);
2267         if (ret < 0) {
2268                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2269                 dpcm_be_dai_hw_free(fe, stream);
2270          } else
2271                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2272 
2273 out:
2274         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2275         mutex_unlock(&fe->card->mutex);
2276         return ret;
2277 }
2278 
2279 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2280                 struct snd_pcm_substream *substream, int cmd)
2281 {
2282         int ret;
2283 
2284         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2285                         dpcm->be->dai_link->name, cmd);
2286 
2287         ret = soc_pcm_trigger(substream, cmd);
2288         if (ret < 0)
2289                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2290 
2291         return ret;
2292 }
2293 
2294 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2295                                int cmd)
2296 {
2297         struct snd_soc_dpcm *dpcm;
2298         int ret = 0;
2299 
2300         for_each_dpcm_be(fe, stream, dpcm) {
2301 
2302                 struct snd_soc_pcm_runtime *be = dpcm->be;
2303                 struct snd_pcm_substream *be_substream =
2304                         snd_soc_dpcm_get_substream(be, stream);
2305 
2306                 /* is this op for this BE ? */
2307                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2308                         continue;
2309 
2310                 switch (cmd) {
2311                 case SNDRV_PCM_TRIGGER_START:
2312                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2313                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2314                                 continue;
2315 
2316                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2317                         if (ret)
2318                                 return ret;
2319 
2320                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2321                         break;
2322                 case SNDRV_PCM_TRIGGER_RESUME:
2323                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2324                                 continue;
2325 
2326                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2327                         if (ret)
2328                                 return ret;
2329 
2330                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2331                         break;
2332                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2333                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2334                                 continue;
2335 
2336                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2337                         if (ret)
2338                                 return ret;
2339 
2340                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2341                         break;
2342                 case SNDRV_PCM_TRIGGER_STOP:
2343                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2344                                 continue;
2345 
2346                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2347                                 continue;
2348 
2349                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2350                         if (ret)
2351                                 return ret;
2352 
2353                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2354                         break;
2355                 case SNDRV_PCM_TRIGGER_SUSPEND:
2356                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2357                                 continue;
2358 
2359                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2360                                 continue;
2361 
2362                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2363                         if (ret)
2364                                 return ret;
2365 
2366                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2367                         break;
2368                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2369                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2370                                 continue;
2371 
2372                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2373                                 continue;
2374 
2375                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2376                         if (ret)
2377                                 return ret;
2378 
2379                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2380                         break;
2381                 }
2382         }
2383 
2384         return ret;
2385 }
2386 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2387 
2388 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2389 {
2390         struct snd_soc_pcm_runtime *fe = substream->private_data;
2391         int stream = substream->stream, ret;
2392         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2393 
2394         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2395 
2396         switch (trigger) {
2397         case SND_SOC_DPCM_TRIGGER_PRE:
2398                 /* call trigger on the frontend before the backend. */
2399 
2400                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2401                                 fe->dai_link->name, cmd);
2402 
2403                 ret = soc_pcm_trigger(substream, cmd);
2404                 if (ret < 0) {
2405                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2406                         goto out;
2407                 }
2408 
2409                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2410                 break;
2411         case SND_SOC_DPCM_TRIGGER_POST:
2412                 /* call trigger on the frontend after the backend. */
2413 
2414                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2415                 if (ret < 0) {
2416                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2417                         goto out;
2418                 }
2419 
2420                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2421                                 fe->dai_link->name, cmd);
2422 
2423                 ret = soc_pcm_trigger(substream, cmd);
2424                 break;
2425         case SND_SOC_DPCM_TRIGGER_BESPOKE:
2426                 /* bespoke trigger() - handles both FE and BEs */
2427 
2428                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2429                                 fe->dai_link->name, cmd);
2430 
2431                 ret = soc_pcm_bespoke_trigger(substream, cmd);
2432                 if (ret < 0) {
2433                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2434                         goto out;
2435                 }
2436                 break;
2437         default:
2438                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2439                                 fe->dai_link->name);
2440                 ret = -EINVAL;
2441                 goto out;
2442         }
2443 
2444         switch (cmd) {
2445         case SNDRV_PCM_TRIGGER_START:
2446         case SNDRV_PCM_TRIGGER_RESUME:
2447         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2448                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2449                 break;
2450         case SNDRV_PCM_TRIGGER_STOP:
2451         case SNDRV_PCM_TRIGGER_SUSPEND:
2452                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2453                 break;
2454         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2455                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2456                 break;
2457         }
2458 
2459 out:
2460         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2461         return ret;
2462 }
2463 
2464 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2465 {
2466         struct snd_soc_pcm_runtime *fe = substream->private_data;
2467         int stream = substream->stream;
2468 
2469         /* if FE's runtime_update is already set, we're in race;
2470          * process this trigger later at exit
2471          */
2472         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2473                 fe->dpcm[stream].trigger_pending = cmd + 1;
2474                 return 0; /* delayed, assuming it's successful */
2475         }
2476 
2477         /* we're alone, let's trigger */
2478         return dpcm_fe_dai_do_trigger(substream, cmd);
2479 }
2480 
2481 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2482 {
2483         struct snd_soc_dpcm *dpcm;
2484         int ret = 0;
2485 
2486         for_each_dpcm_be(fe, stream, dpcm) {
2487 
2488                 struct snd_soc_pcm_runtime *be = dpcm->be;
2489                 struct snd_pcm_substream *be_substream =
2490                         snd_soc_dpcm_get_substream(be, stream);
2491 
2492                 /* is this op for this BE ? */
2493                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2494                         continue;
2495 
2496                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2497                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2498                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2499                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2500                         continue;
2501 
2502                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2503                         be->dai_link->name);
2504 
2505                 ret = soc_pcm_prepare(be_substream);
2506                 if (ret < 0) {
2507                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2508                                 ret);
2509                         break;
2510                 }
2511 
2512                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2513         }
2514         return ret;
2515 }
2516 
2517 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2518 {
2519         struct snd_soc_pcm_runtime *fe = substream->private_data;
2520         int stream = substream->stream, ret = 0;
2521 
2522         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2523 
2524         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2525 
2526         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2527 
2528         /* there is no point preparing this FE if there are no BEs */
2529         if (list_empty(&fe->dpcm[stream].be_clients)) {
2530                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2531                                 fe->dai_link->name);
2532                 ret = -EINVAL;
2533                 goto out;
2534         }
2535 
2536         ret = dpcm_be_dai_prepare(fe, substream->stream);
2537         if (ret < 0)
2538                 goto out;
2539 
2540         /* call prepare on the frontend */
2541         ret = soc_pcm_prepare(substream);
2542         if (ret < 0) {
2543                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2544                         fe->dai_link->name);
2545                 goto out;
2546         }
2547 
2548         /* run the stream event for each BE */
2549         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2550         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2551 
2552 out:
2553         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2554         mutex_unlock(&fe->card->mutex);
2555 
2556         return ret;
2557 }
2558 
2559 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2560                      unsigned int cmd, void *arg)
2561 {
2562         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2563         struct snd_soc_component *component;
2564         struct snd_soc_rtdcom_list *rtdcom;
2565 
2566         for_each_rtdcom(rtd, rtdcom) {
2567                 component = rtdcom->component;
2568 
2569                 if (!component->driver->ops ||
2570                     !component->driver->ops->ioctl)
2571                         continue;
2572 
2573                 /* FIXME: use 1st ioctl */
2574                 return component->driver->ops->ioctl(substream, cmd, arg);
2575         }
2576 
2577         return snd_pcm_lib_ioctl(substream, cmd, arg);
2578 }
2579 
2580 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2581 {
2582         struct snd_pcm_substream *substream =
2583                 snd_soc_dpcm_get_substream(fe, stream);
2584         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2585         int err;
2586 
2587         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2588                         stream ? "capture" : "playback", fe->dai_link->name);
2589 
2590         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2591                 /* call bespoke trigger - FE takes care of all BE triggers */
2592                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2593                                 fe->dai_link->name);
2594 
2595                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2596                 if (err < 0)
2597                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2598         } else {
2599                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2600                         fe->dai_link->name);
2601 
2602                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2603                 if (err < 0)
2604                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2605         }
2606 
2607         err = dpcm_be_dai_hw_free(fe, stream);
2608         if (err < 0)
2609                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2610 
2611         err = dpcm_be_dai_shutdown(fe, stream);
2612         if (err < 0)
2613                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2614 
2615         /* run the stream event for each BE */
2616         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2617 
2618         return 0;
2619 }
2620 
2621 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2622 {
2623         struct snd_pcm_substream *substream =
2624                 snd_soc_dpcm_get_substream(fe, stream);
2625         struct snd_soc_dpcm *dpcm;
2626         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2627         int ret;
2628         unsigned long flags;
2629 
2630         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2631                         stream ? "capture" : "playback", fe->dai_link->name);
2632 
2633         /* Only start the BE if the FE is ready */
2634         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2635                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2636                 return -EINVAL;
2637 
2638         /* startup must always be called for new BEs */
2639         ret = dpcm_be_dai_startup(fe, stream);
2640         if (ret < 0)
2641                 goto disconnect;
2642 
2643         /* keep going if FE state is > open */
2644         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2645                 return 0;
2646 
2647         ret = dpcm_be_dai_hw_params(fe, stream);
2648         if (ret < 0)
2649                 goto close;
2650 
2651         /* keep going if FE state is > hw_params */
2652         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2653                 return 0;
2654 
2655 
2656         ret = dpcm_be_dai_prepare(fe, stream);
2657         if (ret < 0)
2658                 goto hw_free;
2659 
2660         /* run the stream event for each BE */
2661         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2662 
2663         /* keep going if FE state is > prepare */
2664         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2665                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2666                 return 0;
2667 
2668         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2669                 /* call trigger on the frontend - FE takes care of all BE triggers */
2670                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2671                                 fe->dai_link->name);
2672 
2673                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2674                 if (ret < 0) {
2675                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2676                         goto hw_free;
2677                 }
2678         } else {
2679                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2680                         fe->dai_link->name);
2681 
2682                 ret = dpcm_be_dai_trigger(fe, stream,
2683                                         SNDRV_PCM_TRIGGER_START);
2684                 if (ret < 0) {
2685                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2686                         goto hw_free;
2687                 }
2688         }
2689 
2690         return 0;
2691 
2692 hw_free:
2693         dpcm_be_dai_hw_free(fe, stream);
2694 close:
2695         dpcm_be_dai_shutdown(fe, stream);
2696 disconnect:
2697         /* disconnect any non started BEs */
2698         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
2699         for_each_dpcm_be(fe, stream, dpcm) {
2700                 struct snd_soc_pcm_runtime *be = dpcm->be;
2701                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2702                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2703         }
2704         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
2705 
2706         return ret;
2707 }
2708 
2709 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2710 {
2711         int ret;
2712 
2713         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2714         ret = dpcm_run_update_startup(fe, stream);
2715         if (ret < 0)
2716                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2717         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2718 
2719         return ret;
2720 }
2721 
2722 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2723 {
2724         int ret;
2725 
2726         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2727         ret = dpcm_run_update_shutdown(fe, stream);
2728         if (ret < 0)
2729                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2730         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2731 
2732         return ret;
2733 }
2734 
2735 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2736 {
2737         struct snd_soc_dapm_widget_list *list;
2738         int count, paths;
2739 
2740         if (!fe->dai_link->dynamic)
2741                 return 0;
2742 
2743         /* only check active links */
2744         if (!fe->cpu_dai->active)
2745                 return 0;
2746 
2747         /* DAPM sync will call this to update DSP paths */
2748         dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2749                 new ? "new" : "old", fe->dai_link->name);
2750 
2751         /* skip if FE doesn't have playback capability */
2752         if (!fe->cpu_dai->driver->playback.channels_min ||
2753             !fe->codec_dai->driver->playback.channels_min)
2754                 goto capture;
2755 
2756         /* skip if FE isn't currently playing */
2757         if (!fe->cpu_dai->playback_active || !fe->codec_dai->playback_active)
2758                 goto capture;
2759 
2760         paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2761         if (paths < 0) {
2762                 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2763                          fe->dai_link->name,  "playback");
2764                 return paths;
2765         }
2766 
2767         /* update any playback paths */
2768         count = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, new);
2769         if (count) {
2770                 if (new)
2771                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2772                 else
2773                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2774 
2775                 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2776                 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2777         }
2778 
2779         dpcm_path_put(&list);
2780 
2781 capture:
2782         /* skip if FE doesn't have capture capability */
2783         if (!fe->cpu_dai->driver->capture.channels_min ||
2784             !fe->codec_dai->driver->capture.channels_min)
2785                 return 0;
2786 
2787         /* skip if FE isn't currently capturing */
2788         if (!fe->cpu_dai->capture_active || !fe->codec_dai->capture_active)
2789                 return 0;
2790 
2791         paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2792         if (paths < 0) {
2793                 dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2794                          fe->dai_link->name,  "capture");
2795                 return paths;
2796         }
2797 
2798         /* update any old capture paths */
2799         count = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, new);
2800         if (count) {
2801                 if (new)
2802                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2803                 else
2804                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2805 
2806                 dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2807                 dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2808         }
2809 
2810         dpcm_path_put(&list);
2811 
2812         return 0;
2813 }
2814 
2815 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2816  * any DAI links.
2817  */
2818 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2819 {
2820         struct snd_soc_pcm_runtime *fe;
2821         int ret = 0;
2822 
2823         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2824         /* shutdown all old paths first */
2825         for_each_card_rtds(card, fe) {
2826                 ret = soc_dpcm_fe_runtime_update(fe, 0);
2827                 if (ret)
2828                         goto out;
2829         }
2830 
2831         /* bring new paths up */
2832         for_each_card_rtds(card, fe) {
2833                 ret = soc_dpcm_fe_runtime_update(fe, 1);
2834                 if (ret)
2835                         goto out;
2836         }
2837 
2838 out:
2839         mutex_unlock(&card->mutex);
2840         return ret;
2841 }
2842 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2843 {
2844         struct snd_soc_dpcm *dpcm;
2845         struct snd_soc_dai *dai;
2846 
2847         for_each_dpcm_be(fe, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
2848 
2849                 struct snd_soc_pcm_runtime *be = dpcm->be;
2850                 int i;
2851 
2852                 if (be->dai_link->ignore_suspend)
2853                         continue;
2854 
2855                 for_each_rtd_codec_dai(be, i, dai) {
2856                         struct snd_soc_dai_driver *drv = dai->driver;
2857 
2858                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2859                                          be->dai_link->name);
2860 
2861                         if (drv->ops && drv->ops->digital_mute &&
2862                                                         dai->playback_active)
2863                                 drv->ops->digital_mute(dai, mute);
2864                 }
2865         }
2866 
2867         return 0;
2868 }
2869 
2870 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2871 {
2872         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2873         struct snd_soc_dpcm *dpcm;
2874         struct snd_soc_dapm_widget_list *list;
2875         int ret;
2876         int stream = fe_substream->stream;
2877 
2878         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2879         fe->dpcm[stream].runtime = fe_substream->runtime;
2880 
2881         ret = dpcm_path_get(fe, stream, &list);
2882         if (ret < 0) {
2883                 mutex_unlock(&fe->card->mutex);
2884                 return ret;
2885         } else if (ret == 0) {
2886                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2887                         fe->dai_link->name, stream ? "capture" : "playback");
2888         }
2889 
2890         /* calculate valid and active FE <-> BE dpcms */
2891         dpcm_process_paths(fe, stream, &list, 1);
2892 
2893         ret = dpcm_fe_dai_startup(fe_substream);
2894         if (ret < 0) {
2895                 /* clean up all links */
2896                 for_each_dpcm_be(fe, stream, dpcm)
2897                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2898 
2899                 dpcm_be_disconnect(fe, stream);
2900                 fe->dpcm[stream].runtime = NULL;
2901         }
2902 
2903         dpcm_clear_pending_state(fe, stream);
2904         dpcm_path_put(&list);
2905         mutex_unlock(&fe->card->mutex);
2906         return ret;
2907 }
2908 
2909 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2910 {
2911         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2912         struct snd_soc_dpcm *dpcm;
2913         int stream = fe_substream->stream, ret;
2914 
2915         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2916         ret = dpcm_fe_dai_shutdown(fe_substream);
2917 
2918         /* mark FE's links ready to prune */
2919         for_each_dpcm_be(fe, stream, dpcm)
2920                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2921 
2922         dpcm_be_disconnect(fe, stream);
2923 
2924         fe->dpcm[stream].runtime = NULL;
2925         mutex_unlock(&fe->card->mutex);
2926         return ret;
2927 }
2928 
2929 static void soc_pcm_private_free(struct snd_pcm *pcm)
2930 {
2931         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
2932         struct snd_soc_rtdcom_list *rtdcom;
2933         struct snd_soc_component *component;
2934 
2935         /* need to sync the delayed work before releasing resources */
2936         flush_delayed_work(&rtd->delayed_work);
2937         for_each_rtdcom(rtd, rtdcom) {
2938                 component = rtdcom->component;
2939 
2940                 if (component->driver->pcm_free)
2941                         component->driver->pcm_free(pcm);
2942         }
2943 }
2944 
2945 static int soc_rtdcom_ack(struct snd_pcm_substream *substream)
2946 {
2947         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2948         struct snd_soc_rtdcom_list *rtdcom;
2949         struct snd_soc_component *component;
2950 
2951         for_each_rtdcom(rtd, rtdcom) {
2952                 component = rtdcom->component;
2953 
2954                 if (!component->driver->ops ||
2955                     !component->driver->ops->ack)
2956                         continue;
2957 
2958                 /* FIXME. it returns 1st ask now */
2959                 return component->driver->ops->ack(substream);
2960         }
2961 
2962         return -EINVAL;
2963 }
2964 
2965 static int soc_rtdcom_copy_user(struct snd_pcm_substream *substream, int channel,
2966                                 unsigned long pos, void __user *buf,
2967                                 unsigned long bytes)
2968 {
2969         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2970         struct snd_soc_rtdcom_list *rtdcom;
2971         struct snd_soc_component *component;
2972 
2973         for_each_rtdcom(rtd, rtdcom) {
2974                 component = rtdcom->component;
2975 
2976                 if (!component->driver->ops ||
2977                     !component->driver->ops->copy_user)
2978                         continue;
2979 
2980                 /* FIXME. it returns 1st copy now */
2981                 return component->driver->ops->copy_user(substream, channel,
2982                                                          pos, buf, bytes);
2983         }
2984 
2985         return -EINVAL;
2986 }
2987 
2988 static int soc_rtdcom_copy_kernel(struct snd_pcm_substream *substream, int channel,
2989                                   unsigned long pos, void *buf, unsigned long bytes)
2990 {
2991         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2992         struct snd_soc_rtdcom_list *rtdcom;
2993         struct snd_soc_component *component;
2994 
2995         for_each_rtdcom(rtd, rtdcom) {
2996                 component = rtdcom->component;
2997 
2998                 if (!component->driver->ops ||
2999                     !component->driver->ops->copy_kernel)
3000                         continue;
3001 
3002                 /* FIXME. it returns 1st copy now */
3003                 return component->driver->ops->copy_kernel(substream, channel,
3004                                                            pos, buf, bytes);
3005         }
3006 
3007         return -EINVAL;
3008 }
3009 
3010 static int soc_rtdcom_fill_silence(struct snd_pcm_substream *substream, int channel,
3011                                    unsigned long pos, unsigned long bytes)
3012 {
3013         struct snd_soc_pcm_runtime *rtd = substream->private_data;
3014         struct snd_soc_rtdcom_list *rtdcom;
3015         struct snd_soc_component *component;
3016 
3017         for_each_rtdcom(rtd, rtdcom) {
3018                 component = rtdcom->component;
3019 
3020                 if (!component->driver->ops ||
3021                     !component->driver->ops->fill_silence)
3022                         continue;
3023 
3024                 /* FIXME. it returns 1st silence now */
3025                 return component->driver->ops->fill_silence(substream, channel,
3026                                                             pos, bytes);
3027         }
3028 
3029         return -EINVAL;
3030 }
3031 
3032 static struct page *soc_rtdcom_page(struct snd_pcm_substream *substream,
3033                                     unsigned long offset)
3034 {
3035         struct snd_soc_pcm_runtime *rtd = substream->private_data;
3036         struct snd_soc_rtdcom_list *rtdcom;
3037         struct snd_soc_component *component;
3038         struct page *page;
3039 
3040         for_each_rtdcom(rtd, rtdcom) {
3041                 component = rtdcom->component;
3042 
3043                 if (!component->driver->ops ||
3044                     !component->driver->ops->page)
3045                         continue;
3046 
3047                 /* FIXME. it returns 1st page now */
3048                 page = component->driver->ops->page(substream, offset);
3049                 if (page)
3050                         return page;
3051         }
3052 
3053         return NULL;
3054 }
3055 
3056 static int soc_rtdcom_mmap(struct snd_pcm_substream *substream,
3057                            struct vm_area_struct *vma)
3058 {
3059         struct snd_soc_pcm_runtime *rtd = substream->private_data;
3060         struct snd_soc_rtdcom_list *rtdcom;
3061         struct snd_soc_component *component;
3062 
3063         for_each_rtdcom(rtd, rtdcom) {
3064                 component = rtdcom->component;
3065 
3066                 if (!component->driver->ops ||
3067                     !component->driver->ops->mmap)
3068                         continue;
3069 
3070                 /* FIXME. it returns 1st mmap now */
3071                 return component->driver->ops->mmap(substream, vma);
3072         }
3073 
3074         return -EINVAL;
3075 }
3076 
3077 /* create a new pcm */
3078 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
3079 {
3080         struct snd_soc_dai *codec_dai;
3081         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
3082         struct snd_soc_component *component;
3083         struct snd_soc_rtdcom_list *rtdcom;
3084         struct snd_pcm *pcm;
3085         char new_name[64];
3086         int ret = 0, playback = 0, capture = 0;
3087         int i;
3088 
3089         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
3090                 playback = rtd->dai_link->dpcm_playback;
3091                 capture = rtd->dai_link->dpcm_capture;
3092         } else {
3093                 for_each_rtd_codec_dai(rtd, i, codec_dai) {
3094                         if (codec_dai->driver->playback.channels_min)
3095                                 playback = 1;
3096                         if (codec_dai->driver->capture.channels_min)
3097                                 capture = 1;
3098                 }
3099 
3100                 capture = capture && cpu_dai->driver->capture.channels_min;
3101                 playback = playback && cpu_dai->driver->playback.channels_min;
3102         }
3103 
3104         if (rtd->dai_link->playback_only) {
3105                 playback = 1;
3106                 capture = 0;
3107         }
3108 
3109         if (rtd->dai_link->capture_only) {
3110                 playback = 0;
3111                 capture = 1;
3112         }
3113 
3114         /* create the PCM */
3115         if (rtd->dai_link->no_pcm) {
3116                 snprintf(new_name, sizeof(new_name), "(%s)",
3117                         rtd->dai_link->stream_name);
3118 
3119                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
3120                                 playback, capture, &pcm);
3121         } else {
3122                 if (rtd->dai_link->dynamic)
3123                         snprintf(new_name, sizeof(new_name), "%s (*)",
3124                                 rtd->dai_link->stream_name);
3125                 else
3126                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
3127                                 rtd->dai_link->stream_name,
3128                                 (rtd->num_codecs > 1) ?
3129                                 "multicodec" : rtd->codec_dai->name, num);
3130 
3131                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
3132                         capture, &pcm);
3133         }
3134         if (ret < 0) {
3135                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
3136                         rtd->dai_link->name);
3137                 return ret;
3138         }
3139         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
3140 
3141         /* DAPM dai link stream work */
3142         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
3143 
3144         pcm->nonatomic = rtd->dai_link->nonatomic;
3145         rtd->pcm = pcm;
3146         pcm->private_data = rtd;
3147 
3148         if (rtd->dai_link->no_pcm) {
3149                 if (playback)
3150                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
3151                 if (capture)
3152                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
3153                 goto out;
3154         }
3155 
3156         /* ASoC PCM operations */
3157         if (rtd->dai_link->dynamic) {
3158                 rtd->ops.open           = dpcm_fe_dai_open;
3159                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
3160                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
3161                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
3162                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
3163                 rtd->ops.close          = dpcm_fe_dai_close;
3164                 rtd->ops.pointer        = soc_pcm_pointer;
3165                 rtd->ops.ioctl          = soc_pcm_ioctl;
3166         } else {
3167                 rtd->ops.open           = soc_pcm_open;
3168                 rtd->ops.hw_params      = soc_pcm_hw_params;
3169                 rtd->ops.prepare        = soc_pcm_prepare;
3170                 rtd->ops.trigger        = soc_pcm_trigger;
3171                 rtd->ops.hw_free        = soc_pcm_hw_free;
3172                 rtd->ops.close          = soc_pcm_close;
3173                 rtd->ops.pointer        = soc_pcm_pointer;
3174                 rtd->ops.ioctl          = soc_pcm_ioctl;
3175         }
3176 
3177         for_each_rtdcom(rtd, rtdcom) {
3178                 const struct snd_pcm_ops *ops = rtdcom->component->driver->ops;
3179 
3180                 if (!ops)
3181                         continue;
3182 
3183                 if (ops->ack)
3184                         rtd->ops.ack            = soc_rtdcom_ack;
3185                 if (ops->copy_user)
3186                         rtd->ops.copy_user      = soc_rtdcom_copy_user;
3187                 if (ops->copy_kernel)
3188                         rtd->ops.copy_kernel    = soc_rtdcom_copy_kernel;
3189                 if (ops->fill_silence)
3190                         rtd->ops.fill_silence   = soc_rtdcom_fill_silence;
3191                 if (ops->page)
3192                         rtd->ops.page           = soc_rtdcom_page;
3193                 if (ops->mmap)
3194                         rtd->ops.mmap           = soc_rtdcom_mmap;
3195         }
3196 
3197         if (playback)
3198                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3199 
3200         if (capture)
3201                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3202 
3203         for_each_rtdcom(rtd, rtdcom) {
3204                 component = rtdcom->component;
3205 
3206                 if (!component->driver->pcm_new)
3207                         continue;
3208 
3209                 ret = component->driver->pcm_new(rtd);
3210                 if (ret < 0) {
3211                         dev_err(component->dev,
3212                                 "ASoC: pcm constructor failed: %d\n",
3213                                 ret);
3214                         return ret;
3215                 }
3216         }
3217 
3218         pcm->private_free = soc_pcm_private_free;
3219         pcm->no_device_suspend = true;
3220 out:
3221         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
3222                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
3223                  cpu_dai->name);
3224         return ret;
3225 }
3226 
3227 /* is the current PCM operation for this FE ? */
3228 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3229 {
3230         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3231                 return 1;
3232         return 0;
3233 }
3234 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3235 
3236 /* is the current PCM operation for this BE ? */
3237 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3238                 struct snd_soc_pcm_runtime *be, int stream)
3239 {
3240         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3241            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3242                   be->dpcm[stream].runtime_update))
3243                 return 1;
3244         return 0;
3245 }
3246 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3247 
3248 /* get the substream for this BE */
3249 struct snd_pcm_substream *
3250         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3251 {
3252         return be->pcm->streams[stream].substream;
3253 }
3254 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3255 
3256 /* get the BE runtime state */
3257 enum snd_soc_dpcm_state
3258         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
3259 {
3260         return be->dpcm[stream].state;
3261 }
3262 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
3263 
3264 /* set the BE runtime state */
3265 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
3266                 int stream, enum snd_soc_dpcm_state state)
3267 {
3268         be->dpcm[stream].state = state;
3269 }
3270 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
3271 
3272 /*
3273  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3274  * are not running, paused or suspended for the specified stream direction.
3275  */
3276 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3277                 struct snd_soc_pcm_runtime *be, int stream)
3278 {
3279         struct snd_soc_dpcm *dpcm;
3280         int state;
3281         int ret = 1;
3282         unsigned long flags;
3283 
3284         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3285         for_each_dpcm_fe(be, stream, dpcm) {
3286 
3287                 if (dpcm->fe == fe)
3288                         continue;
3289 
3290                 state = dpcm->fe->dpcm[stream].state;
3291                 if (state == SND_SOC_DPCM_STATE_START ||
3292                         state == SND_SOC_DPCM_STATE_PAUSED ||
3293                         state == SND_SOC_DPCM_STATE_SUSPEND) {
3294                         ret = 0;
3295                         break;
3296                 }
3297         }
3298         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3299 
3300         /* it's safe to free/stop this BE DAI */
3301         return ret;
3302 }
3303 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3304 
3305 /*
3306  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3307  * running, paused or suspended for the specified stream direction.
3308  */
3309 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3310                 struct snd_soc_pcm_runtime *be, int stream)
3311 {
3312         struct snd_soc_dpcm *dpcm;
3313         int state;
3314         int ret = 1;
3315         unsigned long flags;
3316 
3317         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3318         for_each_dpcm_fe(be, stream, dpcm) {
3319 
3320                 if (dpcm->fe == fe)
3321                         continue;
3322 
3323                 state = dpcm->fe->dpcm[stream].state;
3324                 if (state == SND_SOC_DPCM_STATE_START ||
3325                         state == SND_SOC_DPCM_STATE_PAUSED ||
3326                         state == SND_SOC_DPCM_STATE_SUSPEND ||
3327                         state == SND_SOC_DPCM_STATE_PREPARE) {
3328                         ret = 0;
3329                         break;
3330                 }
3331         }
3332         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3333 
3334         /* it's safe to change hw_params */
3335         return ret;
3336 }
3337 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3338 
3339 #ifdef CONFIG_DEBUG_FS
3340 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
3341 {
3342         switch (state) {
3343         case SND_SOC_DPCM_STATE_NEW:
3344                 return "new";
3345         case SND_SOC_DPCM_STATE_OPEN:
3346                 return "open";
3347         case SND_SOC_DPCM_STATE_HW_PARAMS:
3348                 return "hw_params";
3349         case SND_SOC_DPCM_STATE_PREPARE:
3350                 return "prepare";
3351         case SND_SOC_DPCM_STATE_START:
3352                 return "start";
3353         case SND_SOC_DPCM_STATE_STOP:
3354                 return "stop";
3355         case SND_SOC_DPCM_STATE_SUSPEND:
3356                 return "suspend";
3357         case SND_SOC_DPCM_STATE_PAUSED:
3358                 return "paused";
3359         case SND_SOC_DPCM_STATE_HW_FREE:
3360                 return "hw_free";
3361         case SND_SOC_DPCM_STATE_CLOSE:
3362                 return "close";
3363         }
3364 
3365         return "unknown";
3366 }
3367 
3368 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
3369                                 int stream, char *buf, size_t size)
3370 {
3371         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
3372         struct snd_soc_dpcm *dpcm;
3373         ssize_t offset = 0;
3374         unsigned long flags;
3375 
3376         /* FE state */
3377         offset += snprintf(buf + offset, size - offset,
3378                         "[%s - %s]\n", fe->dai_link->name,
3379                         stream ? "Capture" : "Playback");
3380 
3381         offset += snprintf(buf + offset, size - offset, "State: %s\n",
3382                         dpcm_state_string(fe->dpcm[stream].state));
3383 
3384         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3385             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3386                 offset += snprintf(buf + offset, size - offset,
3387                                 "Hardware Params: "
3388                                 "Format = %s, Channels = %d, Rate = %d\n",
3389                                 snd_pcm_format_name(params_format(params)),
3390                                 params_channels(params),
3391                                 params_rate(params));
3392 
3393         /* BEs state */
3394         offset += snprintf(buf + offset, size - offset, "Backends:\n");
3395 
3396         if (list_empty(&fe->dpcm[stream].be_clients)) {
3397                 offset += snprintf(buf + offset, size - offset,
3398                                 " No active DSP links\n");
3399                 goto out;
3400         }
3401 
3402         spin_lock_irqsave(&fe->card->dpcm_lock, flags);
3403         for_each_dpcm_be(fe, stream, dpcm) {
3404                 struct snd_soc_pcm_runtime *be = dpcm->be;
3405                 params = &dpcm->hw_params;
3406 
3407                 offset += snprintf(buf + offset, size - offset,
3408                                 "- %s\n", be->dai_link->name);
3409 
3410                 offset += snprintf(buf + offset, size - offset,
3411                                 "   State: %s\n",
3412                                 dpcm_state_string(be->dpcm[stream].state));
3413 
3414                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
3415                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
3416                         offset += snprintf(buf + offset, size - offset,
3417                                 "   Hardware Params: "
3418                                 "Format = %s, Channels = %d, Rate = %d\n",
3419                                 snd_pcm_format_name(params_format(params)),
3420                                 params_channels(params),
3421                                 params_rate(params));
3422         }
3423         spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
3424 out:
3425         return offset;
3426 }
3427 
3428 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
3429                                 size_t count, loff_t *ppos)
3430 {
3431         struct snd_soc_pcm_runtime *fe = file->private_data;
3432         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
3433         char *buf;
3434 
3435         buf = kmalloc(out_count, GFP_KERNEL);
3436         if (!buf)
3437                 return -ENOMEM;
3438 
3439         if (fe->cpu_dai->driver->playback.channels_min)
3440                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
3441                                         buf + offset, out_count - offset);
3442 
3443         if (fe->cpu_dai->driver->capture.channels_min)
3444                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
3445                                         buf + offset, out_count - offset);
3446 
3447         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
3448 
3449         kfree(buf);
3450         return ret;
3451 }
3452 
3453 static const struct file_operations dpcm_state_fops = {
3454         .open = simple_open,
3455         .read = dpcm_state_read_file,
3456         .llseek = default_llseek,
3457 };
3458 
3459 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3460 {
3461         if (!rtd->dai_link)
3462                 return;
3463 
3464         if (!rtd->card->debugfs_card_root)
3465                 return;
3466 
3467         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3468                         rtd->card->debugfs_card_root);
3469         if (!rtd->debugfs_dpcm_root) {
3470                 dev_dbg(rtd->dev,
3471                          "ASoC: Failed to create dpcm debugfs directory %s\n",
3472                          rtd->dai_link->name);
3473                 return;
3474         }
3475 
3476         debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
3477                             rtd, &dpcm_state_fops);
3478 }
3479 #endif
3480 

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