xref: /linux/sound/soc/soc-pcm.c (revision c411ed854584a71b0e86ac3019b60e4789d88086)
1 /*
2  * soc-pcm.c  --  ALSA SoC PCM
3  *
4  * Copyright 2005 Wolfson Microelectronics PLC.
5  * Copyright 2005 Openedhand Ltd.
6  * Copyright (C) 2010 Slimlogic Ltd.
7  * Copyright (C) 2010 Texas Instruments Inc.
8  *
9  * Authors: Liam Girdwood <lrg@ti.com>
10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
11  *
12  *  This program is free software; you can redistribute  it and/or modify it
13  *  under  the terms of  the GNU General  Public License as published by the
14  *  Free Software Foundation;  either version 2 of the  License, or (at your
15  *  option) any later version.
16  *
17  */
18 
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include <linux/export.h>
27 #include <linux/debugfs.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/soc-dpcm.h>
33 #include <sound/initval.h>
34 
35 #define DPCM_MAX_BE_USERS	8
36 
37 /*
38  * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
39  *
40  * Returns true if the DAI supports the indicated stream type.
41  */
42 static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
43 {
44 	struct snd_soc_pcm_stream *codec_stream;
45 
46 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
47 		codec_stream = &dai->driver->playback;
48 	else
49 		codec_stream = &dai->driver->capture;
50 
51 	/* If the codec specifies any rate at all, it supports the stream. */
52 	return codec_stream->rates;
53 }
54 
55 /**
56  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
57  * @rtd: ASoC PCM runtime that is activated
58  * @stream: Direction of the PCM stream
59  *
60  * Increments the active count for all the DAIs and components attached to a PCM
61  * runtime. Should typically be called when a stream is opened.
62  *
63  * Must be called with the rtd->pcm_mutex being held
64  */
65 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
66 {
67 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
68 	int i;
69 
70 	lockdep_assert_held(&rtd->pcm_mutex);
71 
72 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
73 		cpu_dai->playback_active++;
74 		for (i = 0; i < rtd->num_codecs; i++)
75 			rtd->codec_dais[i]->playback_active++;
76 	} else {
77 		cpu_dai->capture_active++;
78 		for (i = 0; i < rtd->num_codecs; i++)
79 			rtd->codec_dais[i]->capture_active++;
80 	}
81 
82 	cpu_dai->active++;
83 	cpu_dai->component->active++;
84 	for (i = 0; i < rtd->num_codecs; i++) {
85 		rtd->codec_dais[i]->active++;
86 		rtd->codec_dais[i]->component->active++;
87 	}
88 }
89 
90 /**
91  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
92  * @rtd: ASoC PCM runtime that is deactivated
93  * @stream: Direction of the PCM stream
94  *
95  * Decrements the active count for all the DAIs and components attached to a PCM
96  * runtime. Should typically be called when a stream is closed.
97  *
98  * Must be called with the rtd->pcm_mutex being held
99  */
100 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
101 {
102 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
103 	int i;
104 
105 	lockdep_assert_held(&rtd->pcm_mutex);
106 
107 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
108 		cpu_dai->playback_active--;
109 		for (i = 0; i < rtd->num_codecs; i++)
110 			rtd->codec_dais[i]->playback_active--;
111 	} else {
112 		cpu_dai->capture_active--;
113 		for (i = 0; i < rtd->num_codecs; i++)
114 			rtd->codec_dais[i]->capture_active--;
115 	}
116 
117 	cpu_dai->active--;
118 	cpu_dai->component->active--;
119 	for (i = 0; i < rtd->num_codecs; i++) {
120 		rtd->codec_dais[i]->component->active--;
121 		rtd->codec_dais[i]->active--;
122 	}
123 }
124 
125 /**
126  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
127  * @rtd: The ASoC PCM runtime that should be checked.
128  *
129  * This function checks whether the power down delay should be ignored for a
130  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
131  * been configured to ignore the delay, or if none of the components benefits
132  * from having the delay.
133  */
134 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
135 {
136 	int i;
137 	bool ignore = true;
138 
139 	if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
140 		return true;
141 
142 	for (i = 0; i < rtd->num_codecs; i++)
143 		ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
144 
145 	return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
146 }
147 
148 /**
149  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
150  * @substream: the pcm substream
151  * @hw: the hardware parameters
152  *
153  * Sets the substream runtime hardware parameters.
154  */
155 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
156 	const struct snd_pcm_hardware *hw)
157 {
158 	struct snd_pcm_runtime *runtime = substream->runtime;
159 	runtime->hw.info = hw->info;
160 	runtime->hw.formats = hw->formats;
161 	runtime->hw.period_bytes_min = hw->period_bytes_min;
162 	runtime->hw.period_bytes_max = hw->period_bytes_max;
163 	runtime->hw.periods_min = hw->periods_min;
164 	runtime->hw.periods_max = hw->periods_max;
165 	runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
166 	runtime->hw.fifo_size = hw->fifo_size;
167 	return 0;
168 }
169 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
170 
171 /* DPCM stream event, send event to FE and all active BEs. */
172 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
173 	int event)
174 {
175 	struct snd_soc_dpcm *dpcm;
176 
177 	list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
178 
179 		struct snd_soc_pcm_runtime *be = dpcm->be;
180 
181 		dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
182 				be->dai_link->name, event, dir);
183 
184 		if ((event == SND_SOC_DAPM_STREAM_STOP) &&
185 		    (be->dpcm[dir].users >= 1))
186 			continue;
187 
188 		snd_soc_dapm_stream_event(be, dir, event);
189 	}
190 
191 	snd_soc_dapm_stream_event(fe, dir, event);
192 
193 	return 0;
194 }
195 
196 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
197 					struct snd_soc_dai *soc_dai)
198 {
199 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
200 	int ret;
201 
202 	if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
203 				rtd->dai_link->symmetric_rates)) {
204 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
205 				soc_dai->rate);
206 
207 		ret = snd_pcm_hw_constraint_single(substream->runtime,
208 						SNDRV_PCM_HW_PARAM_RATE,
209 						soc_dai->rate);
210 		if (ret < 0) {
211 			dev_err(soc_dai->dev,
212 				"ASoC: Unable to apply rate constraint: %d\n",
213 				ret);
214 			return ret;
215 		}
216 	}
217 
218 	if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
219 				rtd->dai_link->symmetric_channels)) {
220 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
221 				soc_dai->channels);
222 
223 		ret = snd_pcm_hw_constraint_single(substream->runtime,
224 						SNDRV_PCM_HW_PARAM_CHANNELS,
225 						soc_dai->channels);
226 		if (ret < 0) {
227 			dev_err(soc_dai->dev,
228 				"ASoC: Unable to apply channel symmetry constraint: %d\n",
229 				ret);
230 			return ret;
231 		}
232 	}
233 
234 	if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
235 				rtd->dai_link->symmetric_samplebits)) {
236 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
237 				soc_dai->sample_bits);
238 
239 		ret = snd_pcm_hw_constraint_single(substream->runtime,
240 						SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
241 						soc_dai->sample_bits);
242 		if (ret < 0) {
243 			dev_err(soc_dai->dev,
244 				"ASoC: Unable to apply sample bits symmetry constraint: %d\n",
245 				ret);
246 			return ret;
247 		}
248 	}
249 
250 	return 0;
251 }
252 
253 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
254 				struct snd_pcm_hw_params *params)
255 {
256 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
257 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
258 	unsigned int rate, channels, sample_bits, symmetry, i;
259 
260 	rate = params_rate(params);
261 	channels = params_channels(params);
262 	sample_bits = snd_pcm_format_physical_width(params_format(params));
263 
264 	/* reject unmatched parameters when applying symmetry */
265 	symmetry = cpu_dai->driver->symmetric_rates ||
266 		rtd->dai_link->symmetric_rates;
267 
268 	for (i = 0; i < rtd->num_codecs; i++)
269 		symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
270 
271 	if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
272 		dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
273 				cpu_dai->rate, rate);
274 		return -EINVAL;
275 	}
276 
277 	symmetry = cpu_dai->driver->symmetric_channels ||
278 		rtd->dai_link->symmetric_channels;
279 
280 	for (i = 0; i < rtd->num_codecs; i++)
281 		symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
282 
283 	if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
284 		dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
285 				cpu_dai->channels, channels);
286 		return -EINVAL;
287 	}
288 
289 	symmetry = cpu_dai->driver->symmetric_samplebits ||
290 		rtd->dai_link->symmetric_samplebits;
291 
292 	for (i = 0; i < rtd->num_codecs; i++)
293 		symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
294 
295 	if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
296 		dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
297 				cpu_dai->sample_bits, sample_bits);
298 		return -EINVAL;
299 	}
300 
301 	return 0;
302 }
303 
304 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
305 {
306 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
307 	struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
308 	struct snd_soc_dai_link *link = rtd->dai_link;
309 	unsigned int symmetry, i;
310 
311 	symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
312 		cpu_driver->symmetric_channels || link->symmetric_channels ||
313 		cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
314 
315 	for (i = 0; i < rtd->num_codecs; i++)
316 		symmetry = symmetry ||
317 			rtd->codec_dais[i]->driver->symmetric_rates ||
318 			rtd->codec_dais[i]->driver->symmetric_channels ||
319 			rtd->codec_dais[i]->driver->symmetric_samplebits;
320 
321 	return symmetry;
322 }
323 
324 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
325 {
326 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
327 	int ret;
328 
329 	if (!bits)
330 		return;
331 
332 	ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
333 	if (ret != 0)
334 		dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
335 				 bits, ret);
336 }
337 
338 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
339 {
340 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
341 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
342 	struct snd_soc_dai *codec_dai;
343 	int i;
344 	unsigned int bits = 0, cpu_bits;
345 
346 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
347 		for (i = 0; i < rtd->num_codecs; i++) {
348 			codec_dai = rtd->codec_dais[i];
349 			if (codec_dai->driver->playback.sig_bits == 0) {
350 				bits = 0;
351 				break;
352 			}
353 			bits = max(codec_dai->driver->playback.sig_bits, bits);
354 		}
355 		cpu_bits = cpu_dai->driver->playback.sig_bits;
356 	} else {
357 		for (i = 0; i < rtd->num_codecs; i++) {
358 			codec_dai = rtd->codec_dais[i];
359 			if (codec_dai->driver->capture.sig_bits == 0) {
360 				bits = 0;
361 				break;
362 			}
363 			bits = max(codec_dai->driver->capture.sig_bits, bits);
364 		}
365 		cpu_bits = cpu_dai->driver->capture.sig_bits;
366 	}
367 
368 	soc_pcm_set_msb(substream, bits);
369 	soc_pcm_set_msb(substream, cpu_bits);
370 }
371 
372 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
373 {
374 	struct snd_pcm_runtime *runtime = substream->runtime;
375 	struct snd_pcm_hardware *hw = &runtime->hw;
376 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
377 	struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
378 	struct snd_soc_dai_driver *codec_dai_drv;
379 	struct snd_soc_pcm_stream *codec_stream;
380 	struct snd_soc_pcm_stream *cpu_stream;
381 	unsigned int chan_min = 0, chan_max = UINT_MAX;
382 	unsigned int rate_min = 0, rate_max = UINT_MAX;
383 	unsigned int rates = UINT_MAX;
384 	u64 formats = ULLONG_MAX;
385 	int i;
386 
387 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
388 		cpu_stream = &cpu_dai_drv->playback;
389 	else
390 		cpu_stream = &cpu_dai_drv->capture;
391 
392 	/* first calculate min/max only for CODECs in the DAI link */
393 	for (i = 0; i < rtd->num_codecs; i++) {
394 
395 		/*
396 		 * Skip CODECs which don't support the current stream type.
397 		 * Otherwise, since the rate, channel, and format values will
398 		 * zero in that case, we would have no usable settings left,
399 		 * causing the resulting setup to fail.
400 		 * At least one CODEC should match, otherwise we should have
401 		 * bailed out on a higher level, since there would be no
402 		 * CODEC to support the transfer direction in that case.
403 		 */
404 		if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
405 					      substream->stream))
406 			continue;
407 
408 		codec_dai_drv = rtd->codec_dais[i]->driver;
409 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
410 			codec_stream = &codec_dai_drv->playback;
411 		else
412 			codec_stream = &codec_dai_drv->capture;
413 		chan_min = max(chan_min, codec_stream->channels_min);
414 		chan_max = min(chan_max, codec_stream->channels_max);
415 		rate_min = max(rate_min, codec_stream->rate_min);
416 		rate_max = min_not_zero(rate_max, codec_stream->rate_max);
417 		formats &= codec_stream->formats;
418 		rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
419 	}
420 
421 	/*
422 	 * chan min/max cannot be enforced if there are multiple CODEC DAIs
423 	 * connected to a single CPU DAI, use CPU DAI's directly and let
424 	 * channel allocation be fixed up later
425 	 */
426 	if (rtd->num_codecs > 1) {
427 		chan_min = cpu_stream->channels_min;
428 		chan_max = cpu_stream->channels_max;
429 	}
430 
431 	hw->channels_min = max(chan_min, cpu_stream->channels_min);
432 	hw->channels_max = min(chan_max, cpu_stream->channels_max);
433 	if (hw->formats)
434 		hw->formats &= formats & cpu_stream->formats;
435 	else
436 		hw->formats = formats & cpu_stream->formats;
437 	hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
438 
439 	snd_pcm_limit_hw_rates(runtime);
440 
441 	hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
442 	hw->rate_min = max(hw->rate_min, rate_min);
443 	hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
444 	hw->rate_max = min_not_zero(hw->rate_max, rate_max);
445 }
446 
447 /*
448  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
449  * then initialized and any private data can be allocated. This also calls
450  * startup for the cpu DAI, platform, machine and codec DAI.
451  */
452 static int soc_pcm_open(struct snd_pcm_substream *substream)
453 {
454 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
455 	struct snd_pcm_runtime *runtime = substream->runtime;
456 	struct snd_soc_platform *platform = rtd->platform;
457 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
458 	struct snd_soc_dai *codec_dai;
459 	const char *codec_dai_name = "multicodec";
460 	int i, ret = 0;
461 
462 	pinctrl_pm_select_default_state(cpu_dai->dev);
463 	for (i = 0; i < rtd->num_codecs; i++)
464 		pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
465 	pm_runtime_get_sync(cpu_dai->dev);
466 	for (i = 0; i < rtd->num_codecs; i++)
467 		pm_runtime_get_sync(rtd->codec_dais[i]->dev);
468 	pm_runtime_get_sync(platform->dev);
469 
470 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
471 
472 	/* startup the audio subsystem */
473 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
474 		ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
475 		if (ret < 0) {
476 			dev_err(cpu_dai->dev, "ASoC: can't open interface"
477 				" %s: %d\n", cpu_dai->name, ret);
478 			goto out;
479 		}
480 	}
481 
482 	if (platform->driver->ops && platform->driver->ops->open) {
483 		ret = platform->driver->ops->open(substream);
484 		if (ret < 0) {
485 			dev_err(platform->dev, "ASoC: can't open platform"
486 				" %s: %d\n", platform->component.name, ret);
487 			goto platform_err;
488 		}
489 	}
490 
491 	for (i = 0; i < rtd->num_codecs; i++) {
492 		codec_dai = rtd->codec_dais[i];
493 		if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
494 			ret = codec_dai->driver->ops->startup(substream,
495 							      codec_dai);
496 			if (ret < 0) {
497 				dev_err(codec_dai->dev,
498 					"ASoC: can't open codec %s: %d\n",
499 					codec_dai->name, ret);
500 				goto codec_dai_err;
501 			}
502 		}
503 
504 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
505 			codec_dai->tx_mask = 0;
506 		else
507 			codec_dai->rx_mask = 0;
508 	}
509 
510 	if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
511 		ret = rtd->dai_link->ops->startup(substream);
512 		if (ret < 0) {
513 			pr_err("ASoC: %s startup failed: %d\n",
514 			       rtd->dai_link->name, ret);
515 			goto machine_err;
516 		}
517 	}
518 
519 	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
520 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
521 		goto dynamic;
522 
523 	/* Check that the codec and cpu DAIs are compatible */
524 	soc_pcm_init_runtime_hw(substream);
525 
526 	if (rtd->num_codecs == 1)
527 		codec_dai_name = rtd->codec_dai->name;
528 
529 	if (soc_pcm_has_symmetry(substream))
530 		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
531 
532 	ret = -EINVAL;
533 	if (!runtime->hw.rates) {
534 		printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
535 			codec_dai_name, cpu_dai->name);
536 		goto config_err;
537 	}
538 	if (!runtime->hw.formats) {
539 		printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
540 			codec_dai_name, cpu_dai->name);
541 		goto config_err;
542 	}
543 	if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
544 	    runtime->hw.channels_min > runtime->hw.channels_max) {
545 		printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
546 				codec_dai_name, cpu_dai->name);
547 		goto config_err;
548 	}
549 
550 	soc_pcm_apply_msb(substream);
551 
552 	/* Symmetry only applies if we've already got an active stream. */
553 	if (cpu_dai->active) {
554 		ret = soc_pcm_apply_symmetry(substream, cpu_dai);
555 		if (ret != 0)
556 			goto config_err;
557 	}
558 
559 	for (i = 0; i < rtd->num_codecs; i++) {
560 		if (rtd->codec_dais[i]->active) {
561 			ret = soc_pcm_apply_symmetry(substream,
562 						     rtd->codec_dais[i]);
563 			if (ret != 0)
564 				goto config_err;
565 		}
566 	}
567 
568 	pr_debug("ASoC: %s <-> %s info:\n",
569 			codec_dai_name, cpu_dai->name);
570 	pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
571 	pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
572 		 runtime->hw.channels_max);
573 	pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
574 		 runtime->hw.rate_max);
575 
576 dynamic:
577 
578 	snd_soc_runtime_activate(rtd, substream->stream);
579 
580 	mutex_unlock(&rtd->pcm_mutex);
581 	return 0;
582 
583 config_err:
584 	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
585 		rtd->dai_link->ops->shutdown(substream);
586 
587 machine_err:
588 	i = rtd->num_codecs;
589 
590 codec_dai_err:
591 	while (--i >= 0) {
592 		codec_dai = rtd->codec_dais[i];
593 		if (codec_dai->driver->ops->shutdown)
594 			codec_dai->driver->ops->shutdown(substream, codec_dai);
595 	}
596 
597 	if (platform->driver->ops && platform->driver->ops->close)
598 		platform->driver->ops->close(substream);
599 
600 platform_err:
601 	if (cpu_dai->driver->ops->shutdown)
602 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
603 out:
604 	mutex_unlock(&rtd->pcm_mutex);
605 
606 	pm_runtime_mark_last_busy(platform->dev);
607 	pm_runtime_put_autosuspend(platform->dev);
608 	for (i = 0; i < rtd->num_codecs; i++) {
609 		pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
610 		pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
611 	}
612 
613 	pm_runtime_mark_last_busy(cpu_dai->dev);
614 	pm_runtime_put_autosuspend(cpu_dai->dev);
615 	for (i = 0; i < rtd->num_codecs; i++) {
616 		if (!rtd->codec_dais[i]->active)
617 			pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
618 	}
619 	if (!cpu_dai->active)
620 		pinctrl_pm_select_sleep_state(cpu_dai->dev);
621 
622 	return ret;
623 }
624 
625 /*
626  * Power down the audio subsystem pmdown_time msecs after close is called.
627  * This is to ensure there are no pops or clicks in between any music tracks
628  * due to DAPM power cycling.
629  */
630 static void close_delayed_work(struct work_struct *work)
631 {
632 	struct snd_soc_pcm_runtime *rtd =
633 			container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
634 	struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
635 
636 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
637 
638 	dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
639 		 codec_dai->driver->playback.stream_name,
640 		 codec_dai->playback_active ? "active" : "inactive",
641 		 rtd->pop_wait ? "yes" : "no");
642 
643 	/* are we waiting on this codec DAI stream */
644 	if (rtd->pop_wait == 1) {
645 		rtd->pop_wait = 0;
646 		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
647 					  SND_SOC_DAPM_STREAM_STOP);
648 	}
649 
650 	mutex_unlock(&rtd->pcm_mutex);
651 }
652 
653 /*
654  * Called by ALSA when a PCM substream is closed. Private data can be
655  * freed here. The cpu DAI, codec DAI, machine and platform are also
656  * shutdown.
657  */
658 static int soc_pcm_close(struct snd_pcm_substream *substream)
659 {
660 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
661 	struct snd_soc_platform *platform = rtd->platform;
662 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
663 	struct snd_soc_dai *codec_dai;
664 	int i;
665 
666 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
667 
668 	snd_soc_runtime_deactivate(rtd, substream->stream);
669 
670 	/* clear the corresponding DAIs rate when inactive */
671 	if (!cpu_dai->active)
672 		cpu_dai->rate = 0;
673 
674 	for (i = 0; i < rtd->num_codecs; i++) {
675 		codec_dai = rtd->codec_dais[i];
676 		if (!codec_dai->active)
677 			codec_dai->rate = 0;
678 	}
679 
680 	snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
681 
682 	if (cpu_dai->driver->ops->shutdown)
683 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
684 
685 	for (i = 0; i < rtd->num_codecs; i++) {
686 		codec_dai = rtd->codec_dais[i];
687 		if (codec_dai->driver->ops->shutdown)
688 			codec_dai->driver->ops->shutdown(substream, codec_dai);
689 	}
690 
691 	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
692 		rtd->dai_link->ops->shutdown(substream);
693 
694 	if (platform->driver->ops && platform->driver->ops->close)
695 		platform->driver->ops->close(substream);
696 
697 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
698 		if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
699 			/* powered down playback stream now */
700 			snd_soc_dapm_stream_event(rtd,
701 						  SNDRV_PCM_STREAM_PLAYBACK,
702 						  SND_SOC_DAPM_STREAM_STOP);
703 		} else {
704 			/* start delayed pop wq here for playback streams */
705 			rtd->pop_wait = 1;
706 			queue_delayed_work(system_power_efficient_wq,
707 					   &rtd->delayed_work,
708 					   msecs_to_jiffies(rtd->pmdown_time));
709 		}
710 	} else {
711 		/* capture streams can be powered down now */
712 		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
713 					  SND_SOC_DAPM_STREAM_STOP);
714 	}
715 
716 	mutex_unlock(&rtd->pcm_mutex);
717 
718 	pm_runtime_mark_last_busy(platform->dev);
719 	pm_runtime_put_autosuspend(platform->dev);
720 
721 	for (i = 0; i < rtd->num_codecs; i++) {
722 		pm_runtime_mark_last_busy(rtd->codec_dais[i]->dev);
723 		pm_runtime_put_autosuspend(rtd->codec_dais[i]->dev);
724 	}
725 
726 	pm_runtime_mark_last_busy(cpu_dai->dev);
727 	pm_runtime_put_autosuspend(cpu_dai->dev);
728 
729 	for (i = 0; i < rtd->num_codecs; i++) {
730 		if (!rtd->codec_dais[i]->active)
731 			pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
732 	}
733 	if (!cpu_dai->active)
734 		pinctrl_pm_select_sleep_state(cpu_dai->dev);
735 
736 	return 0;
737 }
738 
739 /*
740  * Called by ALSA when the PCM substream is prepared, can set format, sample
741  * rate, etc.  This function is non atomic and can be called multiple times,
742  * it can refer to the runtime info.
743  */
744 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
745 {
746 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
747 	struct snd_soc_platform *platform = rtd->platform;
748 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
749 	struct snd_soc_dai *codec_dai;
750 	int i, ret = 0;
751 
752 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
753 
754 	if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
755 		ret = rtd->dai_link->ops->prepare(substream);
756 		if (ret < 0) {
757 			dev_err(rtd->card->dev, "ASoC: machine prepare error:"
758 				" %d\n", ret);
759 			goto out;
760 		}
761 	}
762 
763 	if (platform->driver->ops && platform->driver->ops->prepare) {
764 		ret = platform->driver->ops->prepare(substream);
765 		if (ret < 0) {
766 			dev_err(platform->dev, "ASoC: platform prepare error:"
767 				" %d\n", ret);
768 			goto out;
769 		}
770 	}
771 
772 	for (i = 0; i < rtd->num_codecs; i++) {
773 		codec_dai = rtd->codec_dais[i];
774 		if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
775 			ret = codec_dai->driver->ops->prepare(substream,
776 							      codec_dai);
777 			if (ret < 0) {
778 				dev_err(codec_dai->dev,
779 					"ASoC: codec DAI prepare error: %d\n",
780 					ret);
781 				goto out;
782 			}
783 		}
784 	}
785 
786 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
787 		ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
788 		if (ret < 0) {
789 			dev_err(cpu_dai->dev,
790 				"ASoC: cpu DAI prepare error: %d\n", ret);
791 			goto out;
792 		}
793 	}
794 
795 	/* cancel any delayed stream shutdown that is pending */
796 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
797 	    rtd->pop_wait) {
798 		rtd->pop_wait = 0;
799 		cancel_delayed_work(&rtd->delayed_work);
800 	}
801 
802 	snd_soc_dapm_stream_event(rtd, substream->stream,
803 			SND_SOC_DAPM_STREAM_START);
804 
805 	for (i = 0; i < rtd->num_codecs; i++)
806 		snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
807 					 substream->stream);
808 	snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
809 
810 out:
811 	mutex_unlock(&rtd->pcm_mutex);
812 	return ret;
813 }
814 
815 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
816 				       unsigned int mask)
817 {
818 	struct snd_interval *interval;
819 	int channels = hweight_long(mask);
820 
821 	interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
822 	interval->min = channels;
823 	interval->max = channels;
824 }
825 
826 int soc_dai_hw_params(struct snd_pcm_substream *substream,
827 		      struct snd_pcm_hw_params *params,
828 		      struct snd_soc_dai *dai)
829 {
830 	int ret;
831 
832 	if (dai->driver->ops && dai->driver->ops->hw_params) {
833 		ret = dai->driver->ops->hw_params(substream, params, dai);
834 		if (ret < 0) {
835 			dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
836 				dai->name, ret);
837 			return ret;
838 		}
839 	}
840 
841 	return 0;
842 }
843 
844 /*
845  * Called by ALSA when the hardware params are set by application. This
846  * function can also be called multiple times and can allocate buffers
847  * (using snd_pcm_lib_* ). It's non-atomic.
848  */
849 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
850 				struct snd_pcm_hw_params *params)
851 {
852 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
853 	struct snd_soc_platform *platform = rtd->platform;
854 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
855 	int i, ret = 0;
856 
857 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
858 
859 	ret = soc_pcm_params_symmetry(substream, params);
860 	if (ret)
861 		goto out;
862 
863 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
864 		ret = rtd->dai_link->ops->hw_params(substream, params);
865 		if (ret < 0) {
866 			dev_err(rtd->card->dev, "ASoC: machine hw_params"
867 				" failed: %d\n", ret);
868 			goto out;
869 		}
870 	}
871 
872 	for (i = 0; i < rtd->num_codecs; i++) {
873 		struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
874 		struct snd_pcm_hw_params codec_params;
875 
876 		/*
877 		 * Skip CODECs which don't support the current stream type,
878 		 * the idea being that if a CODEC is not used for the currently
879 		 * set up transfer direction, it should not need to be
880 		 * configured, especially since the configuration used might
881 		 * not even be supported by that CODEC. There may be cases
882 		 * however where a CODEC needs to be set up although it is
883 		 * actually not being used for the transfer, e.g. if a
884 		 * capture-only CODEC is acting as an LRCLK and/or BCLK master
885 		 * for the DAI link including a playback-only CODEC.
886 		 * If this becomes necessary, we will have to augment the
887 		 * machine driver setup with information on how to act, so
888 		 * we can do the right thing here.
889 		 */
890 		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
891 			continue;
892 
893 		/* copy params for each codec */
894 		codec_params = *params;
895 
896 		/* fixup params based on TDM slot masks */
897 		if (codec_dai->tx_mask)
898 			soc_pcm_codec_params_fixup(&codec_params,
899 						   codec_dai->tx_mask);
900 		if (codec_dai->rx_mask)
901 			soc_pcm_codec_params_fixup(&codec_params,
902 						   codec_dai->rx_mask);
903 
904 		ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
905 		if(ret < 0)
906 			goto codec_err;
907 
908 		codec_dai->rate = params_rate(&codec_params);
909 		codec_dai->channels = params_channels(&codec_params);
910 		codec_dai->sample_bits = snd_pcm_format_physical_width(
911 						params_format(&codec_params));
912 	}
913 
914 	ret = soc_dai_hw_params(substream, params, cpu_dai);
915 	if (ret < 0)
916 		goto interface_err;
917 
918 	if (platform->driver->ops && platform->driver->ops->hw_params) {
919 		ret = platform->driver->ops->hw_params(substream, params);
920 		if (ret < 0) {
921 			dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
922 			       platform->component.name, ret);
923 			goto platform_err;
924 		}
925 	}
926 
927 	/* store the parameters for each DAIs */
928 	cpu_dai->rate = params_rate(params);
929 	cpu_dai->channels = params_channels(params);
930 	cpu_dai->sample_bits =
931 		snd_pcm_format_physical_width(params_format(params));
932 
933 out:
934 	mutex_unlock(&rtd->pcm_mutex);
935 	return ret;
936 
937 platform_err:
938 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
939 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
940 
941 interface_err:
942 	i = rtd->num_codecs;
943 
944 codec_err:
945 	while (--i >= 0) {
946 		struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
947 		if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
948 			codec_dai->driver->ops->hw_free(substream, codec_dai);
949 		codec_dai->rate = 0;
950 	}
951 
952 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
953 		rtd->dai_link->ops->hw_free(substream);
954 
955 	mutex_unlock(&rtd->pcm_mutex);
956 	return ret;
957 }
958 
959 /*
960  * Frees resources allocated by hw_params, can be called multiple times
961  */
962 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
963 {
964 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
965 	struct snd_soc_platform *platform = rtd->platform;
966 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
967 	struct snd_soc_dai *codec_dai;
968 	bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
969 	int i;
970 
971 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
972 
973 	/* clear the corresponding DAIs parameters when going to be inactive */
974 	if (cpu_dai->active == 1) {
975 		cpu_dai->rate = 0;
976 		cpu_dai->channels = 0;
977 		cpu_dai->sample_bits = 0;
978 	}
979 
980 	for (i = 0; i < rtd->num_codecs; i++) {
981 		codec_dai = rtd->codec_dais[i];
982 		if (codec_dai->active == 1) {
983 			codec_dai->rate = 0;
984 			codec_dai->channels = 0;
985 			codec_dai->sample_bits = 0;
986 		}
987 	}
988 
989 	/* apply codec digital mute */
990 	for (i = 0; i < rtd->num_codecs; i++) {
991 		if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
992 		    (!playback && rtd->codec_dais[i]->capture_active == 1))
993 			snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
994 						 substream->stream);
995 	}
996 
997 	/* free any machine hw params */
998 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
999 		rtd->dai_link->ops->hw_free(substream);
1000 
1001 	/* free any DMA resources */
1002 	if (platform->driver->ops && platform->driver->ops->hw_free)
1003 		platform->driver->ops->hw_free(substream);
1004 
1005 	/* now free hw params for the DAIs  */
1006 	for (i = 0; i < rtd->num_codecs; i++) {
1007 		codec_dai = rtd->codec_dais[i];
1008 		if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1009 			codec_dai->driver->ops->hw_free(substream, codec_dai);
1010 	}
1011 
1012 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1013 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1014 
1015 	mutex_unlock(&rtd->pcm_mutex);
1016 	return 0;
1017 }
1018 
1019 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1020 {
1021 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1022 	struct snd_soc_platform *platform = rtd->platform;
1023 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1024 	struct snd_soc_dai *codec_dai;
1025 	int i, ret;
1026 
1027 	for (i = 0; i < rtd->num_codecs; i++) {
1028 		codec_dai = rtd->codec_dais[i];
1029 		if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1030 			ret = codec_dai->driver->ops->trigger(substream,
1031 							      cmd, codec_dai);
1032 			if (ret < 0)
1033 				return ret;
1034 		}
1035 	}
1036 
1037 	if (platform->driver->ops && platform->driver->ops->trigger) {
1038 		ret = platform->driver->ops->trigger(substream, cmd);
1039 		if (ret < 0)
1040 			return ret;
1041 	}
1042 
1043 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1044 		ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1045 		if (ret < 0)
1046 			return ret;
1047 	}
1048 
1049 	if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1050 		ret = rtd->dai_link->ops->trigger(substream, cmd);
1051 		if (ret < 0)
1052 			return ret;
1053 	}
1054 
1055 	return 0;
1056 }
1057 
1058 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1059 				   int cmd)
1060 {
1061 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1062 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1063 	struct snd_soc_dai *codec_dai;
1064 	int i, ret;
1065 
1066 	for (i = 0; i < rtd->num_codecs; i++) {
1067 		codec_dai = rtd->codec_dais[i];
1068 		if (codec_dai->driver->ops &&
1069 		    codec_dai->driver->ops->bespoke_trigger) {
1070 			ret = codec_dai->driver->ops->bespoke_trigger(substream,
1071 								cmd, codec_dai);
1072 			if (ret < 0)
1073 				return ret;
1074 		}
1075 	}
1076 
1077 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1078 		ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1079 		if (ret < 0)
1080 			return ret;
1081 	}
1082 	return 0;
1083 }
1084 /*
1085  * soc level wrapper for pointer callback
1086  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1087  * the runtime->delay will be updated accordingly.
1088  */
1089 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1090 {
1091 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1092 	struct snd_soc_platform *platform = rtd->platform;
1093 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1094 	struct snd_soc_dai *codec_dai;
1095 	struct snd_pcm_runtime *runtime = substream->runtime;
1096 	snd_pcm_uframes_t offset = 0;
1097 	snd_pcm_sframes_t delay = 0;
1098 	snd_pcm_sframes_t codec_delay = 0;
1099 	int i;
1100 
1101 	if (platform->driver->ops && platform->driver->ops->pointer)
1102 		offset = platform->driver->ops->pointer(substream);
1103 
1104 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1105 		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1106 
1107 	for (i = 0; i < rtd->num_codecs; i++) {
1108 		codec_dai = rtd->codec_dais[i];
1109 		if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1110 			codec_delay = max(codec_delay,
1111 					codec_dai->driver->ops->delay(substream,
1112 								    codec_dai));
1113 	}
1114 	delay += codec_delay;
1115 
1116 	runtime->delay = delay;
1117 
1118 	return offset;
1119 }
1120 
1121 /* connect a FE and BE */
1122 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1123 		struct snd_soc_pcm_runtime *be, int stream)
1124 {
1125 	struct snd_soc_dpcm *dpcm;
1126 
1127 	/* only add new dpcms */
1128 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1129 		if (dpcm->be == be && dpcm->fe == fe)
1130 			return 0;
1131 	}
1132 
1133 	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1134 	if (!dpcm)
1135 		return -ENOMEM;
1136 
1137 	dpcm->be = be;
1138 	dpcm->fe = fe;
1139 	be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1140 	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1141 	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1142 	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1143 
1144 	dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1145 			stream ? "capture" : "playback",  fe->dai_link->name,
1146 			stream ? "<-" : "->", be->dai_link->name);
1147 
1148 #ifdef CONFIG_DEBUG_FS
1149 	if (fe->debugfs_dpcm_root)
1150 		dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1151 				fe->debugfs_dpcm_root, &dpcm->state);
1152 #endif
1153 	return 1;
1154 }
1155 
1156 /* reparent a BE onto another FE */
1157 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1158 			struct snd_soc_pcm_runtime *be, int stream)
1159 {
1160 	struct snd_soc_dpcm *dpcm;
1161 	struct snd_pcm_substream *fe_substream, *be_substream;
1162 
1163 	/* reparent if BE is connected to other FEs */
1164 	if (!be->dpcm[stream].users)
1165 		return;
1166 
1167 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1168 
1169 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1170 		if (dpcm->fe == fe)
1171 			continue;
1172 
1173 		dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1174 			stream ? "capture" : "playback",
1175 			dpcm->fe->dai_link->name,
1176 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1177 
1178 		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1179 		be_substream->runtime = fe_substream->runtime;
1180 		break;
1181 	}
1182 }
1183 
1184 /* disconnect a BE and FE */
1185 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1186 {
1187 	struct snd_soc_dpcm *dpcm, *d;
1188 
1189 	list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1190 		dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1191 				stream ? "capture" : "playback",
1192 				dpcm->be->dai_link->name);
1193 
1194 		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1195 			continue;
1196 
1197 		dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1198 			stream ? "capture" : "playback", fe->dai_link->name,
1199 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1200 
1201 		/* BEs still alive need new FE */
1202 		dpcm_be_reparent(fe, dpcm->be, stream);
1203 
1204 #ifdef CONFIG_DEBUG_FS
1205 		debugfs_remove(dpcm->debugfs_state);
1206 #endif
1207 		list_del(&dpcm->list_be);
1208 		list_del(&dpcm->list_fe);
1209 		kfree(dpcm);
1210 	}
1211 }
1212 
1213 /* get BE for DAI widget and stream */
1214 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1215 		struct snd_soc_dapm_widget *widget, int stream)
1216 {
1217 	struct snd_soc_pcm_runtime *be;
1218 	int i;
1219 
1220 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1221 		list_for_each_entry(be, &card->rtd_list, list) {
1222 
1223 			if (!be->dai_link->no_pcm)
1224 				continue;
1225 
1226 			if (be->cpu_dai->playback_widget == widget)
1227 				return be;
1228 
1229 			for (i = 0; i < be->num_codecs; i++) {
1230 				struct snd_soc_dai *dai = be->codec_dais[i];
1231 				if (dai->playback_widget == widget)
1232 					return be;
1233 			}
1234 		}
1235 	} else {
1236 
1237 		list_for_each_entry(be, &card->rtd_list, list) {
1238 
1239 			if (!be->dai_link->no_pcm)
1240 				continue;
1241 
1242 			if (be->cpu_dai->capture_widget == widget)
1243 				return be;
1244 
1245 			for (i = 0; i < be->num_codecs; i++) {
1246 				struct snd_soc_dai *dai = be->codec_dais[i];
1247 				if (dai->capture_widget == widget)
1248 					return be;
1249 			}
1250 		}
1251 	}
1252 
1253 	dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1254 		stream ? "capture" : "playback", widget->name);
1255 	return NULL;
1256 }
1257 
1258 static inline struct snd_soc_dapm_widget *
1259 	dai_get_widget(struct snd_soc_dai *dai, int stream)
1260 {
1261 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1262 		return dai->playback_widget;
1263 	else
1264 		return dai->capture_widget;
1265 }
1266 
1267 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1268 		struct snd_soc_dapm_widget *widget)
1269 {
1270 	int i;
1271 
1272 	for (i = 0; i < list->num_widgets; i++) {
1273 		if (widget == list->widgets[i])
1274 			return 1;
1275 	}
1276 
1277 	return 0;
1278 }
1279 
1280 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1281 		enum snd_soc_dapm_direction dir)
1282 {
1283 	struct snd_soc_card *card = widget->dapm->card;
1284 	struct snd_soc_pcm_runtime *rtd;
1285 	int i;
1286 
1287 	if (dir == SND_SOC_DAPM_DIR_OUT) {
1288 		list_for_each_entry(rtd, &card->rtd_list, list) {
1289 			if (!rtd->dai_link->no_pcm)
1290 				continue;
1291 
1292 			if (rtd->cpu_dai->playback_widget == widget)
1293 				return true;
1294 
1295 			for (i = 0; i < rtd->num_codecs; ++i) {
1296 				struct snd_soc_dai *dai = rtd->codec_dais[i];
1297 				if (dai->playback_widget == widget)
1298 					return true;
1299 			}
1300 		}
1301 	} else { /* SND_SOC_DAPM_DIR_IN */
1302 		list_for_each_entry(rtd, &card->rtd_list, list) {
1303 			if (!rtd->dai_link->no_pcm)
1304 				continue;
1305 
1306 			if (rtd->cpu_dai->capture_widget == widget)
1307 				return true;
1308 
1309 			for (i = 0; i < rtd->num_codecs; ++i) {
1310 				struct snd_soc_dai *dai = rtd->codec_dais[i];
1311 				if (dai->capture_widget == widget)
1312 					return true;
1313 			}
1314 		}
1315 	}
1316 
1317 	return false;
1318 }
1319 
1320 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1321 	int stream, struct snd_soc_dapm_widget_list **list)
1322 {
1323 	struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1324 	int paths;
1325 
1326 	/* get number of valid DAI paths and their widgets */
1327 	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1328 			dpcm_end_walk_at_be);
1329 
1330 	dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1331 			stream ? "capture" : "playback");
1332 
1333 	return paths;
1334 }
1335 
1336 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1337 	struct snd_soc_dapm_widget_list **list_)
1338 {
1339 	struct snd_soc_dpcm *dpcm;
1340 	struct snd_soc_dapm_widget_list *list = *list_;
1341 	struct snd_soc_dapm_widget *widget;
1342 	int prune = 0;
1343 
1344 	/* Destroy any old FE <--> BE connections */
1345 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1346 		unsigned int i;
1347 
1348 		/* is there a valid CPU DAI widget for this BE */
1349 		widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1350 
1351 		/* prune the BE if it's no longer in our active list */
1352 		if (widget && widget_in_list(list, widget))
1353 			continue;
1354 
1355 		/* is there a valid CODEC DAI widget for this BE */
1356 		for (i = 0; i < dpcm->be->num_codecs; i++) {
1357 			struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1358 			widget = dai_get_widget(dai, stream);
1359 
1360 			/* prune the BE if it's no longer in our active list */
1361 			if (widget && widget_in_list(list, widget))
1362 				continue;
1363 		}
1364 
1365 		dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1366 			stream ? "capture" : "playback",
1367 			dpcm->be->dai_link->name, fe->dai_link->name);
1368 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1369 		dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1370 		prune++;
1371 	}
1372 
1373 	dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1374 	return prune;
1375 }
1376 
1377 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1378 	struct snd_soc_dapm_widget_list **list_)
1379 {
1380 	struct snd_soc_card *card = fe->card;
1381 	struct snd_soc_dapm_widget_list *list = *list_;
1382 	struct snd_soc_pcm_runtime *be;
1383 	int i, new = 0, err;
1384 
1385 	/* Create any new FE <--> BE connections */
1386 	for (i = 0; i < list->num_widgets; i++) {
1387 
1388 		switch (list->widgets[i]->id) {
1389 		case snd_soc_dapm_dai_in:
1390 			if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1391 				continue;
1392 			break;
1393 		case snd_soc_dapm_dai_out:
1394 			if (stream != SNDRV_PCM_STREAM_CAPTURE)
1395 				continue;
1396 			break;
1397 		default:
1398 			continue;
1399 		}
1400 
1401 		/* is there a valid BE rtd for this widget */
1402 		be = dpcm_get_be(card, list->widgets[i], stream);
1403 		if (!be) {
1404 			dev_err(fe->dev, "ASoC: no BE found for %s\n",
1405 					list->widgets[i]->name);
1406 			continue;
1407 		}
1408 
1409 		/* make sure BE is a real BE */
1410 		if (!be->dai_link->no_pcm)
1411 			continue;
1412 
1413 		/* don't connect if FE is not running */
1414 		if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1415 			continue;
1416 
1417 		/* newly connected FE and BE */
1418 		err = dpcm_be_connect(fe, be, stream);
1419 		if (err < 0) {
1420 			dev_err(fe->dev, "ASoC: can't connect %s\n",
1421 				list->widgets[i]->name);
1422 			break;
1423 		} else if (err == 0) /* already connected */
1424 			continue;
1425 
1426 		/* new */
1427 		be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1428 		new++;
1429 	}
1430 
1431 	dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1432 	return new;
1433 }
1434 
1435 /*
1436  * Find the corresponding BE DAIs that source or sink audio to this
1437  * FE substream.
1438  */
1439 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1440 	int stream, struct snd_soc_dapm_widget_list **list, int new)
1441 {
1442 	if (new)
1443 		return dpcm_add_paths(fe, stream, list);
1444 	else
1445 		return dpcm_prune_paths(fe, stream, list);
1446 }
1447 
1448 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1449 {
1450 	struct snd_soc_dpcm *dpcm;
1451 
1452 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1453 		dpcm->be->dpcm[stream].runtime_update =
1454 						SND_SOC_DPCM_UPDATE_NO;
1455 }
1456 
1457 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1458 	int stream)
1459 {
1460 	struct snd_soc_dpcm *dpcm;
1461 
1462 	/* disable any enabled and non active backends */
1463 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1464 
1465 		struct snd_soc_pcm_runtime *be = dpcm->be;
1466 		struct snd_pcm_substream *be_substream =
1467 			snd_soc_dpcm_get_substream(be, stream);
1468 
1469 		if (be->dpcm[stream].users == 0)
1470 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1471 				stream ? "capture" : "playback",
1472 				be->dpcm[stream].state);
1473 
1474 		if (--be->dpcm[stream].users != 0)
1475 			continue;
1476 
1477 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1478 			continue;
1479 
1480 		soc_pcm_close(be_substream);
1481 		be_substream->runtime = NULL;
1482 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1483 	}
1484 }
1485 
1486 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1487 {
1488 	struct snd_soc_dpcm *dpcm;
1489 	int err, count = 0;
1490 
1491 	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
1492 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1493 
1494 		struct snd_soc_pcm_runtime *be = dpcm->be;
1495 		struct snd_pcm_substream *be_substream =
1496 			snd_soc_dpcm_get_substream(be, stream);
1497 
1498 		if (!be_substream) {
1499 			dev_err(be->dev, "ASoC: no backend %s stream\n",
1500 				stream ? "capture" : "playback");
1501 			continue;
1502 		}
1503 
1504 		/* is this op for this BE ? */
1505 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1506 			continue;
1507 
1508 		/* first time the dpcm is open ? */
1509 		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1510 			dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1511 				stream ? "capture" : "playback",
1512 				be->dpcm[stream].state);
1513 
1514 		if (be->dpcm[stream].users++ != 0)
1515 			continue;
1516 
1517 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1518 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1519 			continue;
1520 
1521 		dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1522 			stream ? "capture" : "playback", be->dai_link->name);
1523 
1524 		be_substream->runtime = be->dpcm[stream].runtime;
1525 		err = soc_pcm_open(be_substream);
1526 		if (err < 0) {
1527 			dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1528 			be->dpcm[stream].users--;
1529 			if (be->dpcm[stream].users < 0)
1530 				dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1531 					stream ? "capture" : "playback",
1532 					be->dpcm[stream].state);
1533 
1534 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1535 			goto unwind;
1536 		}
1537 
1538 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1539 		count++;
1540 	}
1541 
1542 	return count;
1543 
1544 unwind:
1545 	/* disable any enabled and non active backends */
1546 	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1547 		struct snd_soc_pcm_runtime *be = dpcm->be;
1548 		struct snd_pcm_substream *be_substream =
1549 			snd_soc_dpcm_get_substream(be, stream);
1550 
1551 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1552 			continue;
1553 
1554 		if (be->dpcm[stream].users == 0)
1555 			dev_err(be->dev, "ASoC: no users %s at close %d\n",
1556 				stream ? "capture" : "playback",
1557 				be->dpcm[stream].state);
1558 
1559 		if (--be->dpcm[stream].users != 0)
1560 			continue;
1561 
1562 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1563 			continue;
1564 
1565 		soc_pcm_close(be_substream);
1566 		be_substream->runtime = NULL;
1567 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1568 	}
1569 
1570 	return err;
1571 }
1572 
1573 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1574 				 struct snd_soc_pcm_stream *stream,
1575 				 u64 formats)
1576 {
1577 	runtime->hw.rate_min = stream->rate_min;
1578 	runtime->hw.rate_max = stream->rate_max;
1579 	runtime->hw.channels_min = stream->channels_min;
1580 	runtime->hw.channels_max = stream->channels_max;
1581 	if (runtime->hw.formats)
1582 		runtime->hw.formats &= formats & stream->formats;
1583 	else
1584 		runtime->hw.formats = formats & stream->formats;
1585 	runtime->hw.rates = stream->rates;
1586 }
1587 
1588 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1589 {
1590 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1591 	struct snd_soc_dpcm *dpcm;
1592 	u64 formats = ULLONG_MAX;
1593 	int stream = substream->stream;
1594 
1595 	if (!fe->dai_link->dpcm_merged_format)
1596 		return formats;
1597 
1598 	/*
1599 	 * It returns merged BE codec format
1600 	 * if FE want to use it (= dpcm_merged_format)
1601 	 */
1602 
1603 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1604 		struct snd_soc_pcm_runtime *be = dpcm->be;
1605 		struct snd_soc_dai_driver *codec_dai_drv;
1606 		struct snd_soc_pcm_stream *codec_stream;
1607 		int i;
1608 
1609 		for (i = 0; i < be->num_codecs; i++) {
1610 			codec_dai_drv = be->codec_dais[i]->driver;
1611 			if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1612 				codec_stream = &codec_dai_drv->playback;
1613 			else
1614 				codec_stream = &codec_dai_drv->capture;
1615 
1616 			formats &= codec_stream->formats;
1617 		}
1618 	}
1619 
1620 	return formats;
1621 }
1622 
1623 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1624 {
1625 	struct snd_pcm_runtime *runtime = substream->runtime;
1626 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1627 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1628 	struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1629 	u64 format = dpcm_runtime_base_format(substream);
1630 
1631 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1632 		dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1633 	else
1634 		dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1635 }
1636 
1637 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1638 
1639 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1640  * for avoiding the race with trigger callback.
1641  * If the state is unset and a trigger is pending while the previous operation,
1642  * process the pending trigger action here.
1643  */
1644 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1645 				     int stream, enum snd_soc_dpcm_update state)
1646 {
1647 	struct snd_pcm_substream *substream =
1648 		snd_soc_dpcm_get_substream(fe, stream);
1649 
1650 	snd_pcm_stream_lock_irq(substream);
1651 	if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1652 		dpcm_fe_dai_do_trigger(substream,
1653 				       fe->dpcm[stream].trigger_pending - 1);
1654 		fe->dpcm[stream].trigger_pending = 0;
1655 	}
1656 	fe->dpcm[stream].runtime_update = state;
1657 	snd_pcm_stream_unlock_irq(substream);
1658 }
1659 
1660 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1661 			       int stream)
1662 {
1663 	struct snd_soc_dpcm *dpcm;
1664 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1665 	struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1666 	int err;
1667 
1668 	/* apply symmetry for FE */
1669 	if (soc_pcm_has_symmetry(fe_substream))
1670 		fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1671 
1672 	/* Symmetry only applies if we've got an active stream. */
1673 	if (fe_cpu_dai->active) {
1674 		err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1675 		if (err < 0)
1676 			return err;
1677 	}
1678 
1679 	/* apply symmetry for BE */
1680 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1681 		struct snd_soc_pcm_runtime *be = dpcm->be;
1682 		struct snd_pcm_substream *be_substream =
1683 			snd_soc_dpcm_get_substream(be, stream);
1684 		struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1685 		int i;
1686 
1687 		if (rtd->dai_link->be_hw_params_fixup)
1688 			continue;
1689 
1690 		if (soc_pcm_has_symmetry(be_substream))
1691 			be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1692 
1693 		/* Symmetry only applies if we've got an active stream. */
1694 		if (rtd->cpu_dai->active) {
1695 			err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1696 			if (err < 0)
1697 				return err;
1698 		}
1699 
1700 		for (i = 0; i < rtd->num_codecs; i++) {
1701 			if (rtd->codec_dais[i]->active) {
1702 				err = soc_pcm_apply_symmetry(be_substream,
1703 							     rtd->codec_dais[i]);
1704 				if (err < 0)
1705 					return err;
1706 			}
1707 		}
1708 	}
1709 
1710 	return 0;
1711 }
1712 
1713 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1714 {
1715 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1716 	struct snd_pcm_runtime *runtime = fe_substream->runtime;
1717 	int stream = fe_substream->stream, ret = 0;
1718 
1719 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1720 
1721 	ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1722 	if (ret < 0) {
1723 		dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1724 		goto be_err;
1725 	}
1726 
1727 	dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1728 
1729 	/* start the DAI frontend */
1730 	ret = soc_pcm_open(fe_substream);
1731 	if (ret < 0) {
1732 		dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1733 		goto unwind;
1734 	}
1735 
1736 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1737 
1738 	dpcm_set_fe_runtime(fe_substream);
1739 	snd_pcm_limit_hw_rates(runtime);
1740 
1741 	ret = dpcm_apply_symmetry(fe_substream, stream);
1742 	if (ret < 0) {
1743 		dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1744 			ret);
1745 		goto unwind;
1746 	}
1747 
1748 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1749 	return 0;
1750 
1751 unwind:
1752 	dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1753 be_err:
1754 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1755 	return ret;
1756 }
1757 
1758 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1759 {
1760 	struct snd_soc_dpcm *dpcm;
1761 
1762 	/* only shutdown BEs that are either sinks or sources to this FE DAI */
1763 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1764 
1765 		struct snd_soc_pcm_runtime *be = dpcm->be;
1766 		struct snd_pcm_substream *be_substream =
1767 			snd_soc_dpcm_get_substream(be, stream);
1768 
1769 		/* is this op for this BE ? */
1770 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1771 			continue;
1772 
1773 		if (be->dpcm[stream].users == 0)
1774 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1775 				stream ? "capture" : "playback",
1776 				be->dpcm[stream].state);
1777 
1778 		if (--be->dpcm[stream].users != 0)
1779 			continue;
1780 
1781 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1782 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1783 			continue;
1784 
1785 		dev_dbg(be->dev, "ASoC: close BE %s\n",
1786 			be->dai_link->name);
1787 
1788 		soc_pcm_close(be_substream);
1789 		be_substream->runtime = NULL;
1790 
1791 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1792 	}
1793 	return 0;
1794 }
1795 
1796 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1797 {
1798 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1799 	int stream = substream->stream;
1800 
1801 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1802 
1803 	/* shutdown the BEs */
1804 	dpcm_be_dai_shutdown(fe, substream->stream);
1805 
1806 	dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1807 
1808 	/* now shutdown the frontend */
1809 	soc_pcm_close(substream);
1810 
1811 	/* run the stream event for each BE */
1812 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1813 
1814 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1815 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1816 	return 0;
1817 }
1818 
1819 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1820 {
1821 	struct snd_soc_dpcm *dpcm;
1822 
1823 	/* only hw_params backends that are either sinks or sources
1824 	 * to this frontend DAI */
1825 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1826 
1827 		struct snd_soc_pcm_runtime *be = dpcm->be;
1828 		struct snd_pcm_substream *be_substream =
1829 			snd_soc_dpcm_get_substream(be, stream);
1830 
1831 		/* is this op for this BE ? */
1832 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1833 			continue;
1834 
1835 		/* only free hw when no longer used - check all FEs */
1836 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1837 				continue;
1838 
1839 		/* do not free hw if this BE is used by other FE */
1840 		if (be->dpcm[stream].users > 1)
1841 			continue;
1842 
1843 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1844 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1845 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1846 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1847 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1848 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1849 			continue;
1850 
1851 		dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1852 			be->dai_link->name);
1853 
1854 		soc_pcm_hw_free(be_substream);
1855 
1856 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1857 	}
1858 
1859 	return 0;
1860 }
1861 
1862 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1863 {
1864 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1865 	int err, stream = substream->stream;
1866 
1867 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1868 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1869 
1870 	dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1871 
1872 	/* call hw_free on the frontend */
1873 	err = soc_pcm_hw_free(substream);
1874 	if (err < 0)
1875 		dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1876 			fe->dai_link->name);
1877 
1878 	/* only hw_params backends that are either sinks or sources
1879 	 * to this frontend DAI */
1880 	err = dpcm_be_dai_hw_free(fe, stream);
1881 
1882 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1883 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1884 
1885 	mutex_unlock(&fe->card->mutex);
1886 	return 0;
1887 }
1888 
1889 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1890 {
1891 	struct snd_soc_dpcm *dpcm;
1892 	int ret;
1893 
1894 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1895 
1896 		struct snd_soc_pcm_runtime *be = dpcm->be;
1897 		struct snd_pcm_substream *be_substream =
1898 			snd_soc_dpcm_get_substream(be, stream);
1899 
1900 		/* is this op for this BE ? */
1901 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1902 			continue;
1903 
1904 		/* copy params for each dpcm */
1905 		memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1906 				sizeof(struct snd_pcm_hw_params));
1907 
1908 		/* perform any hw_params fixups */
1909 		if (be->dai_link->be_hw_params_fixup) {
1910 			ret = be->dai_link->be_hw_params_fixup(be,
1911 					&dpcm->hw_params);
1912 			if (ret < 0) {
1913 				dev_err(be->dev,
1914 					"ASoC: hw_params BE fixup failed %d\n",
1915 					ret);
1916 				goto unwind;
1917 			}
1918 		}
1919 
1920 		/* only allow hw_params() if no connected FEs are running */
1921 		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1922 			continue;
1923 
1924 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1925 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1926 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1927 			continue;
1928 
1929 		dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1930 			be->dai_link->name);
1931 
1932 		ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1933 		if (ret < 0) {
1934 			dev_err(dpcm->be->dev,
1935 				"ASoC: hw_params BE failed %d\n", ret);
1936 			goto unwind;
1937 		}
1938 
1939 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1940 	}
1941 	return 0;
1942 
1943 unwind:
1944 	/* disable any enabled and non active backends */
1945 	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1946 		struct snd_soc_pcm_runtime *be = dpcm->be;
1947 		struct snd_pcm_substream *be_substream =
1948 			snd_soc_dpcm_get_substream(be, stream);
1949 
1950 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1951 			continue;
1952 
1953 		/* only allow hw_free() if no connected FEs are running */
1954 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1955 			continue;
1956 
1957 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1958 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1959 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1960 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1961 			continue;
1962 
1963 		soc_pcm_hw_free(be_substream);
1964 	}
1965 
1966 	return ret;
1967 }
1968 
1969 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1970 				 struct snd_pcm_hw_params *params)
1971 {
1972 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1973 	int ret, stream = substream->stream;
1974 
1975 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1976 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1977 
1978 	memcpy(&fe->dpcm[substream->stream].hw_params, params,
1979 			sizeof(struct snd_pcm_hw_params));
1980 	ret = dpcm_be_dai_hw_params(fe, substream->stream);
1981 	if (ret < 0) {
1982 		dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1983 		goto out;
1984 	}
1985 
1986 	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1987 			fe->dai_link->name, params_rate(params),
1988 			params_channels(params), params_format(params));
1989 
1990 	/* call hw_params on the frontend */
1991 	ret = soc_pcm_hw_params(substream, params);
1992 	if (ret < 0) {
1993 		dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1994 		dpcm_be_dai_hw_free(fe, stream);
1995 	 } else
1996 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1997 
1998 out:
1999 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2000 	mutex_unlock(&fe->card->mutex);
2001 	return ret;
2002 }
2003 
2004 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2005 		struct snd_pcm_substream *substream, int cmd)
2006 {
2007 	int ret;
2008 
2009 	dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2010 			dpcm->be->dai_link->name, cmd);
2011 
2012 	ret = soc_pcm_trigger(substream, cmd);
2013 	if (ret < 0)
2014 		dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2015 
2016 	return ret;
2017 }
2018 
2019 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2020 			       int cmd)
2021 {
2022 	struct snd_soc_dpcm *dpcm;
2023 	int ret = 0;
2024 
2025 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2026 
2027 		struct snd_soc_pcm_runtime *be = dpcm->be;
2028 		struct snd_pcm_substream *be_substream =
2029 			snd_soc_dpcm_get_substream(be, stream);
2030 
2031 		/* is this op for this BE ? */
2032 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2033 			continue;
2034 
2035 		switch (cmd) {
2036 		case SNDRV_PCM_TRIGGER_START:
2037 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2038 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2039 				continue;
2040 
2041 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2042 			if (ret)
2043 				return ret;
2044 
2045 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2046 			break;
2047 		case SNDRV_PCM_TRIGGER_RESUME:
2048 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2049 				continue;
2050 
2051 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2052 			if (ret)
2053 				return ret;
2054 
2055 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2056 			break;
2057 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2058 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2059 				continue;
2060 
2061 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2062 			if (ret)
2063 				return ret;
2064 
2065 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2066 			break;
2067 		case SNDRV_PCM_TRIGGER_STOP:
2068 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2069 				continue;
2070 
2071 			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2072 				continue;
2073 
2074 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2075 			if (ret)
2076 				return ret;
2077 
2078 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2079 			break;
2080 		case SNDRV_PCM_TRIGGER_SUSPEND:
2081 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2082 				continue;
2083 
2084 			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2085 				continue;
2086 
2087 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2088 			if (ret)
2089 				return ret;
2090 
2091 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2092 			break;
2093 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2094 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2095 				continue;
2096 
2097 			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2098 				continue;
2099 
2100 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2101 			if (ret)
2102 				return ret;
2103 
2104 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2105 			break;
2106 		}
2107 	}
2108 
2109 	return ret;
2110 }
2111 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2112 
2113 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2114 {
2115 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2116 	int stream = substream->stream, ret;
2117 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2118 
2119 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2120 
2121 	switch (trigger) {
2122 	case SND_SOC_DPCM_TRIGGER_PRE:
2123 		/* call trigger on the frontend before the backend. */
2124 
2125 		dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2126 				fe->dai_link->name, cmd);
2127 
2128 		ret = soc_pcm_trigger(substream, cmd);
2129 		if (ret < 0) {
2130 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2131 			goto out;
2132 		}
2133 
2134 		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2135 		break;
2136 	case SND_SOC_DPCM_TRIGGER_POST:
2137 		/* call trigger on the frontend after the backend. */
2138 
2139 		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2140 		if (ret < 0) {
2141 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2142 			goto out;
2143 		}
2144 
2145 		dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2146 				fe->dai_link->name, cmd);
2147 
2148 		ret = soc_pcm_trigger(substream, cmd);
2149 		break;
2150 	case SND_SOC_DPCM_TRIGGER_BESPOKE:
2151 		/* bespoke trigger() - handles both FE and BEs */
2152 
2153 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2154 				fe->dai_link->name, cmd);
2155 
2156 		ret = soc_pcm_bespoke_trigger(substream, cmd);
2157 		if (ret < 0) {
2158 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2159 			goto out;
2160 		}
2161 		break;
2162 	default:
2163 		dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2164 				fe->dai_link->name);
2165 		ret = -EINVAL;
2166 		goto out;
2167 	}
2168 
2169 	switch (cmd) {
2170 	case SNDRV_PCM_TRIGGER_START:
2171 	case SNDRV_PCM_TRIGGER_RESUME:
2172 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2173 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2174 		break;
2175 	case SNDRV_PCM_TRIGGER_STOP:
2176 	case SNDRV_PCM_TRIGGER_SUSPEND:
2177 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2178 		break;
2179 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2180 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2181 		break;
2182 	}
2183 
2184 out:
2185 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2186 	return ret;
2187 }
2188 
2189 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2190 {
2191 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2192 	int stream = substream->stream;
2193 
2194 	/* if FE's runtime_update is already set, we're in race;
2195 	 * process this trigger later at exit
2196 	 */
2197 	if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2198 		fe->dpcm[stream].trigger_pending = cmd + 1;
2199 		return 0; /* delayed, assuming it's successful */
2200 	}
2201 
2202 	/* we're alone, let's trigger */
2203 	return dpcm_fe_dai_do_trigger(substream, cmd);
2204 }
2205 
2206 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2207 {
2208 	struct snd_soc_dpcm *dpcm;
2209 	int ret = 0;
2210 
2211 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2212 
2213 		struct snd_soc_pcm_runtime *be = dpcm->be;
2214 		struct snd_pcm_substream *be_substream =
2215 			snd_soc_dpcm_get_substream(be, stream);
2216 
2217 		/* is this op for this BE ? */
2218 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2219 			continue;
2220 
2221 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2222 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2223 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2224 			continue;
2225 
2226 		dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2227 			be->dai_link->name);
2228 
2229 		ret = soc_pcm_prepare(be_substream);
2230 		if (ret < 0) {
2231 			dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2232 				ret);
2233 			break;
2234 		}
2235 
2236 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2237 	}
2238 	return ret;
2239 }
2240 
2241 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2242 {
2243 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2244 	int stream = substream->stream, ret = 0;
2245 
2246 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2247 
2248 	dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2249 
2250 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2251 
2252 	/* there is no point preparing this FE if there are no BEs */
2253 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2254 		dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2255 				fe->dai_link->name);
2256 		ret = -EINVAL;
2257 		goto out;
2258 	}
2259 
2260 	ret = dpcm_be_dai_prepare(fe, substream->stream);
2261 	if (ret < 0)
2262 		goto out;
2263 
2264 	/* call prepare on the frontend */
2265 	ret = soc_pcm_prepare(substream);
2266 	if (ret < 0) {
2267 		dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2268 			fe->dai_link->name);
2269 		goto out;
2270 	}
2271 
2272 	/* run the stream event for each BE */
2273 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2274 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2275 
2276 out:
2277 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2278 	mutex_unlock(&fe->card->mutex);
2279 
2280 	return ret;
2281 }
2282 
2283 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2284 		     unsigned int cmd, void *arg)
2285 {
2286 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
2287 	struct snd_soc_platform *platform = rtd->platform;
2288 
2289 	if (platform->driver->ops && platform->driver->ops->ioctl)
2290 		return platform->driver->ops->ioctl(substream, cmd, arg);
2291 	return snd_pcm_lib_ioctl(substream, cmd, arg);
2292 }
2293 
2294 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2295 {
2296 	struct snd_pcm_substream *substream =
2297 		snd_soc_dpcm_get_substream(fe, stream);
2298 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2299 	int err;
2300 
2301 	dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2302 			stream ? "capture" : "playback", fe->dai_link->name);
2303 
2304 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2305 		/* call bespoke trigger - FE takes care of all BE triggers */
2306 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2307 				fe->dai_link->name);
2308 
2309 		err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2310 		if (err < 0)
2311 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2312 	} else {
2313 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2314 			fe->dai_link->name);
2315 
2316 		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2317 		if (err < 0)
2318 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2319 	}
2320 
2321 	err = dpcm_be_dai_hw_free(fe, stream);
2322 	if (err < 0)
2323 		dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2324 
2325 	err = dpcm_be_dai_shutdown(fe, stream);
2326 	if (err < 0)
2327 		dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2328 
2329 	/* run the stream event for each BE */
2330 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2331 
2332 	return 0;
2333 }
2334 
2335 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2336 {
2337 	struct snd_pcm_substream *substream =
2338 		snd_soc_dpcm_get_substream(fe, stream);
2339 	struct snd_soc_dpcm *dpcm;
2340 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2341 	int ret;
2342 
2343 	dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2344 			stream ? "capture" : "playback", fe->dai_link->name);
2345 
2346 	/* Only start the BE if the FE is ready */
2347 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2348 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2349 		return -EINVAL;
2350 
2351 	/* startup must always be called for new BEs */
2352 	ret = dpcm_be_dai_startup(fe, stream);
2353 	if (ret < 0)
2354 		goto disconnect;
2355 
2356 	/* keep going if FE state is > open */
2357 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2358 		return 0;
2359 
2360 	ret = dpcm_be_dai_hw_params(fe, stream);
2361 	if (ret < 0)
2362 		goto close;
2363 
2364 	/* keep going if FE state is > hw_params */
2365 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2366 		return 0;
2367 
2368 
2369 	ret = dpcm_be_dai_prepare(fe, stream);
2370 	if (ret < 0)
2371 		goto hw_free;
2372 
2373 	/* run the stream event for each BE */
2374 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2375 
2376 	/* keep going if FE state is > prepare */
2377 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2378 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2379 		return 0;
2380 
2381 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2382 		/* call trigger on the frontend - FE takes care of all BE triggers */
2383 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2384 				fe->dai_link->name);
2385 
2386 		ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2387 		if (ret < 0) {
2388 			dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2389 			goto hw_free;
2390 		}
2391 	} else {
2392 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2393 			fe->dai_link->name);
2394 
2395 		ret = dpcm_be_dai_trigger(fe, stream,
2396 					SNDRV_PCM_TRIGGER_START);
2397 		if (ret < 0) {
2398 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2399 			goto hw_free;
2400 		}
2401 	}
2402 
2403 	return 0;
2404 
2405 hw_free:
2406 	dpcm_be_dai_hw_free(fe, stream);
2407 close:
2408 	dpcm_be_dai_shutdown(fe, stream);
2409 disconnect:
2410 	/* disconnect any non started BEs */
2411 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2412 		struct snd_soc_pcm_runtime *be = dpcm->be;
2413 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2414 				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2415 	}
2416 
2417 	return ret;
2418 }
2419 
2420 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2421 {
2422 	int ret;
2423 
2424 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2425 	ret = dpcm_run_update_startup(fe, stream);
2426 	if (ret < 0)
2427 		dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2428 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2429 
2430 	return ret;
2431 }
2432 
2433 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2434 {
2435 	int ret;
2436 
2437 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2438 	ret = dpcm_run_update_shutdown(fe, stream);
2439 	if (ret < 0)
2440 		dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2441 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2442 
2443 	return ret;
2444 }
2445 
2446 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2447  * any DAI links.
2448  */
2449 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2450 {
2451 	struct snd_soc_pcm_runtime *fe;
2452 	int old, new, paths;
2453 
2454 	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2455 	list_for_each_entry(fe, &card->rtd_list, list) {
2456 		struct snd_soc_dapm_widget_list *list;
2457 
2458 		/* make sure link is FE */
2459 		if (!fe->dai_link->dynamic)
2460 			continue;
2461 
2462 		/* only check active links */
2463 		if (!fe->cpu_dai->active)
2464 			continue;
2465 
2466 		/* DAPM sync will call this to update DSP paths */
2467 		dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2468 			fe->dai_link->name);
2469 
2470 		/* skip if FE doesn't have playback capability */
2471 		if (!fe->cpu_dai->driver->playback.channels_min
2472 		    || !fe->codec_dai->driver->playback.channels_min)
2473 			goto capture;
2474 
2475 		/* skip if FE isn't currently playing */
2476 		if (!fe->cpu_dai->playback_active
2477 		    || !fe->codec_dai->playback_active)
2478 			goto capture;
2479 
2480 		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2481 		if (paths < 0) {
2482 			dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2483 					fe->dai_link->name,  "playback");
2484 			mutex_unlock(&card->mutex);
2485 			return paths;
2486 		}
2487 
2488 		/* update any new playback paths */
2489 		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2490 		if (new) {
2491 			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2492 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2493 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2494 		}
2495 
2496 		/* update any old playback paths */
2497 		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2498 		if (old) {
2499 			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2500 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2501 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2502 		}
2503 
2504 		dpcm_path_put(&list);
2505 capture:
2506 		/* skip if FE doesn't have capture capability */
2507 		if (!fe->cpu_dai->driver->capture.channels_min
2508 		    || !fe->codec_dai->driver->capture.channels_min)
2509 			continue;
2510 
2511 		/* skip if FE isn't currently capturing */
2512 		if (!fe->cpu_dai->capture_active
2513 		    || !fe->codec_dai->capture_active)
2514 			continue;
2515 
2516 		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2517 		if (paths < 0) {
2518 			dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2519 					fe->dai_link->name,  "capture");
2520 			mutex_unlock(&card->mutex);
2521 			return paths;
2522 		}
2523 
2524 		/* update any new capture paths */
2525 		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2526 		if (new) {
2527 			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2528 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2529 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2530 		}
2531 
2532 		/* update any old capture paths */
2533 		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2534 		if (old) {
2535 			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2536 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2537 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2538 		}
2539 
2540 		dpcm_path_put(&list);
2541 	}
2542 
2543 	mutex_unlock(&card->mutex);
2544 	return 0;
2545 }
2546 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2547 {
2548 	struct snd_soc_dpcm *dpcm;
2549 	struct list_head *clients =
2550 		&fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2551 
2552 	list_for_each_entry(dpcm, clients, list_be) {
2553 
2554 		struct snd_soc_pcm_runtime *be = dpcm->be;
2555 		int i;
2556 
2557 		if (be->dai_link->ignore_suspend)
2558 			continue;
2559 
2560 		for (i = 0; i < be->num_codecs; i++) {
2561 			struct snd_soc_dai *dai = be->codec_dais[i];
2562 			struct snd_soc_dai_driver *drv = dai->driver;
2563 
2564 			dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2565 					 be->dai_link->name);
2566 
2567 			if (drv->ops && drv->ops->digital_mute &&
2568 							dai->playback_active)
2569 				drv->ops->digital_mute(dai, mute);
2570 		}
2571 	}
2572 
2573 	return 0;
2574 }
2575 
2576 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2577 {
2578 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2579 	struct snd_soc_dpcm *dpcm;
2580 	struct snd_soc_dapm_widget_list *list;
2581 	int ret;
2582 	int stream = fe_substream->stream;
2583 
2584 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2585 	fe->dpcm[stream].runtime = fe_substream->runtime;
2586 
2587 	ret = dpcm_path_get(fe, stream, &list);
2588 	if (ret < 0) {
2589 		mutex_unlock(&fe->card->mutex);
2590 		return ret;
2591 	} else if (ret == 0) {
2592 		dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2593 			fe->dai_link->name, stream ? "capture" : "playback");
2594 	}
2595 
2596 	/* calculate valid and active FE <-> BE dpcms */
2597 	dpcm_process_paths(fe, stream, &list, 1);
2598 
2599 	ret = dpcm_fe_dai_startup(fe_substream);
2600 	if (ret < 0) {
2601 		/* clean up all links */
2602 		list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2603 			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2604 
2605 		dpcm_be_disconnect(fe, stream);
2606 		fe->dpcm[stream].runtime = NULL;
2607 	}
2608 
2609 	dpcm_clear_pending_state(fe, stream);
2610 	dpcm_path_put(&list);
2611 	mutex_unlock(&fe->card->mutex);
2612 	return ret;
2613 }
2614 
2615 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2616 {
2617 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2618 	struct snd_soc_dpcm *dpcm;
2619 	int stream = fe_substream->stream, ret;
2620 
2621 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2622 	ret = dpcm_fe_dai_shutdown(fe_substream);
2623 
2624 	/* mark FE's links ready to prune */
2625 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2626 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2627 
2628 	dpcm_be_disconnect(fe, stream);
2629 
2630 	fe->dpcm[stream].runtime = NULL;
2631 	mutex_unlock(&fe->card->mutex);
2632 	return ret;
2633 }
2634 
2635 /* create a new pcm */
2636 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2637 {
2638 	struct snd_soc_platform *platform = rtd->platform;
2639 	struct snd_soc_dai *codec_dai;
2640 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2641 	struct snd_pcm *pcm;
2642 	char new_name[64];
2643 	int ret = 0, playback = 0, capture = 0;
2644 	int i;
2645 
2646 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2647 		playback = rtd->dai_link->dpcm_playback;
2648 		capture = rtd->dai_link->dpcm_capture;
2649 	} else {
2650 		for (i = 0; i < rtd->num_codecs; i++) {
2651 			codec_dai = rtd->codec_dais[i];
2652 			if (codec_dai->driver->playback.channels_min)
2653 				playback = 1;
2654 			if (codec_dai->driver->capture.channels_min)
2655 				capture = 1;
2656 		}
2657 
2658 		capture = capture && cpu_dai->driver->capture.channels_min;
2659 		playback = playback && cpu_dai->driver->playback.channels_min;
2660 	}
2661 
2662 	if (rtd->dai_link->playback_only) {
2663 		playback = 1;
2664 		capture = 0;
2665 	}
2666 
2667 	if (rtd->dai_link->capture_only) {
2668 		playback = 0;
2669 		capture = 1;
2670 	}
2671 
2672 	/* create the PCM */
2673 	if (rtd->dai_link->no_pcm) {
2674 		snprintf(new_name, sizeof(new_name), "(%s)",
2675 			rtd->dai_link->stream_name);
2676 
2677 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2678 				playback, capture, &pcm);
2679 	} else {
2680 		if (rtd->dai_link->dynamic)
2681 			snprintf(new_name, sizeof(new_name), "%s (*)",
2682 				rtd->dai_link->stream_name);
2683 		else
2684 			snprintf(new_name, sizeof(new_name), "%s %s-%d",
2685 				rtd->dai_link->stream_name,
2686 				(rtd->num_codecs > 1) ?
2687 				"multicodec" : rtd->codec_dai->name, num);
2688 
2689 		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2690 			capture, &pcm);
2691 	}
2692 	if (ret < 0) {
2693 		dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2694 			rtd->dai_link->name);
2695 		return ret;
2696 	}
2697 	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2698 
2699 	/* DAPM dai link stream work */
2700 	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2701 
2702 	pcm->nonatomic = rtd->dai_link->nonatomic;
2703 	rtd->pcm = pcm;
2704 	pcm->private_data = rtd;
2705 
2706 	if (rtd->dai_link->no_pcm) {
2707 		if (playback)
2708 			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2709 		if (capture)
2710 			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2711 		goto out;
2712 	}
2713 
2714 	/* ASoC PCM operations */
2715 	if (rtd->dai_link->dynamic) {
2716 		rtd->ops.open		= dpcm_fe_dai_open;
2717 		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
2718 		rtd->ops.prepare	= dpcm_fe_dai_prepare;
2719 		rtd->ops.trigger	= dpcm_fe_dai_trigger;
2720 		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
2721 		rtd->ops.close		= dpcm_fe_dai_close;
2722 		rtd->ops.pointer	= soc_pcm_pointer;
2723 		rtd->ops.ioctl		= soc_pcm_ioctl;
2724 	} else {
2725 		rtd->ops.open		= soc_pcm_open;
2726 		rtd->ops.hw_params	= soc_pcm_hw_params;
2727 		rtd->ops.prepare	= soc_pcm_prepare;
2728 		rtd->ops.trigger	= soc_pcm_trigger;
2729 		rtd->ops.hw_free	= soc_pcm_hw_free;
2730 		rtd->ops.close		= soc_pcm_close;
2731 		rtd->ops.pointer	= soc_pcm_pointer;
2732 		rtd->ops.ioctl		= soc_pcm_ioctl;
2733 	}
2734 
2735 	if (platform->driver->ops) {
2736 		rtd->ops.ack		= platform->driver->ops->ack;
2737 		rtd->ops.copy_user	= platform->driver->ops->copy_user;
2738 		rtd->ops.copy_kernel	= platform->driver->ops->copy_kernel;
2739 		rtd->ops.fill_silence	= platform->driver->ops->fill_silence;
2740 		rtd->ops.page		= platform->driver->ops->page;
2741 		rtd->ops.mmap		= platform->driver->ops->mmap;
2742 	}
2743 
2744 	if (playback)
2745 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2746 
2747 	if (capture)
2748 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2749 
2750 	if (platform->driver->pcm_new) {
2751 		ret = platform->driver->pcm_new(rtd);
2752 		if (ret < 0) {
2753 			dev_err(platform->dev,
2754 				"ASoC: pcm constructor failed: %d\n",
2755 				ret);
2756 			return ret;
2757 		}
2758 	}
2759 
2760 	pcm->private_free = platform->driver->pcm_free;
2761 out:
2762 	dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2763 		 (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2764 		 cpu_dai->name);
2765 	return ret;
2766 }
2767 
2768 /* is the current PCM operation for this FE ? */
2769 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2770 {
2771 	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2772 		return 1;
2773 	return 0;
2774 }
2775 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2776 
2777 /* is the current PCM operation for this BE ? */
2778 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2779 		struct snd_soc_pcm_runtime *be, int stream)
2780 {
2781 	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2782 	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2783 		  be->dpcm[stream].runtime_update))
2784 		return 1;
2785 	return 0;
2786 }
2787 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2788 
2789 /* get the substream for this BE */
2790 struct snd_pcm_substream *
2791 	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2792 {
2793 	return be->pcm->streams[stream].substream;
2794 }
2795 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2796 
2797 /* get the BE runtime state */
2798 enum snd_soc_dpcm_state
2799 	snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2800 {
2801 	return be->dpcm[stream].state;
2802 }
2803 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2804 
2805 /* set the BE runtime state */
2806 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2807 		int stream, enum snd_soc_dpcm_state state)
2808 {
2809 	be->dpcm[stream].state = state;
2810 }
2811 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2812 
2813 /*
2814  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2815  * are not running, paused or suspended for the specified stream direction.
2816  */
2817 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2818 		struct snd_soc_pcm_runtime *be, int stream)
2819 {
2820 	struct snd_soc_dpcm *dpcm;
2821 	int state;
2822 
2823 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2824 
2825 		if (dpcm->fe == fe)
2826 			continue;
2827 
2828 		state = dpcm->fe->dpcm[stream].state;
2829 		if (state == SND_SOC_DPCM_STATE_START ||
2830 			state == SND_SOC_DPCM_STATE_PAUSED ||
2831 			state == SND_SOC_DPCM_STATE_SUSPEND)
2832 			return 0;
2833 	}
2834 
2835 	/* it's safe to free/stop this BE DAI */
2836 	return 1;
2837 }
2838 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2839 
2840 /*
2841  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2842  * running, paused or suspended for the specified stream direction.
2843  */
2844 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2845 		struct snd_soc_pcm_runtime *be, int stream)
2846 {
2847 	struct snd_soc_dpcm *dpcm;
2848 	int state;
2849 
2850 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2851 
2852 		if (dpcm->fe == fe)
2853 			continue;
2854 
2855 		state = dpcm->fe->dpcm[stream].state;
2856 		if (state == SND_SOC_DPCM_STATE_START ||
2857 			state == SND_SOC_DPCM_STATE_PAUSED ||
2858 			state == SND_SOC_DPCM_STATE_SUSPEND ||
2859 			state == SND_SOC_DPCM_STATE_PREPARE)
2860 			return 0;
2861 	}
2862 
2863 	/* it's safe to change hw_params */
2864 	return 1;
2865 }
2866 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2867 
2868 #ifdef CONFIG_DEBUG_FS
2869 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2870 {
2871 	switch (state) {
2872 	case SND_SOC_DPCM_STATE_NEW:
2873 		return "new";
2874 	case SND_SOC_DPCM_STATE_OPEN:
2875 		return "open";
2876 	case SND_SOC_DPCM_STATE_HW_PARAMS:
2877 		return "hw_params";
2878 	case SND_SOC_DPCM_STATE_PREPARE:
2879 		return "prepare";
2880 	case SND_SOC_DPCM_STATE_START:
2881 		return "start";
2882 	case SND_SOC_DPCM_STATE_STOP:
2883 		return "stop";
2884 	case SND_SOC_DPCM_STATE_SUSPEND:
2885 		return "suspend";
2886 	case SND_SOC_DPCM_STATE_PAUSED:
2887 		return "paused";
2888 	case SND_SOC_DPCM_STATE_HW_FREE:
2889 		return "hw_free";
2890 	case SND_SOC_DPCM_STATE_CLOSE:
2891 		return "close";
2892 	}
2893 
2894 	return "unknown";
2895 }
2896 
2897 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2898 				int stream, char *buf, size_t size)
2899 {
2900 	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2901 	struct snd_soc_dpcm *dpcm;
2902 	ssize_t offset = 0;
2903 
2904 	/* FE state */
2905 	offset += snprintf(buf + offset, size - offset,
2906 			"[%s - %s]\n", fe->dai_link->name,
2907 			stream ? "Capture" : "Playback");
2908 
2909 	offset += snprintf(buf + offset, size - offset, "State: %s\n",
2910 	                dpcm_state_string(fe->dpcm[stream].state));
2911 
2912 	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2913 	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2914 		offset += snprintf(buf + offset, size - offset,
2915 				"Hardware Params: "
2916 				"Format = %s, Channels = %d, Rate = %d\n",
2917 				snd_pcm_format_name(params_format(params)),
2918 				params_channels(params),
2919 				params_rate(params));
2920 
2921 	/* BEs state */
2922 	offset += snprintf(buf + offset, size - offset, "Backends:\n");
2923 
2924 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2925 		offset += snprintf(buf + offset, size - offset,
2926 				" No active DSP links\n");
2927 		goto out;
2928 	}
2929 
2930 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2931 		struct snd_soc_pcm_runtime *be = dpcm->be;
2932 		params = &dpcm->hw_params;
2933 
2934 		offset += snprintf(buf + offset, size - offset,
2935 				"- %s\n", be->dai_link->name);
2936 
2937 		offset += snprintf(buf + offset, size - offset,
2938 				"   State: %s\n",
2939 				dpcm_state_string(be->dpcm[stream].state));
2940 
2941 		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2942 		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2943 			offset += snprintf(buf + offset, size - offset,
2944 				"   Hardware Params: "
2945 				"Format = %s, Channels = %d, Rate = %d\n",
2946 				snd_pcm_format_name(params_format(params)),
2947 				params_channels(params),
2948 				params_rate(params));
2949 	}
2950 
2951 out:
2952 	return offset;
2953 }
2954 
2955 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2956 				size_t count, loff_t *ppos)
2957 {
2958 	struct snd_soc_pcm_runtime *fe = file->private_data;
2959 	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2960 	char *buf;
2961 
2962 	buf = kmalloc(out_count, GFP_KERNEL);
2963 	if (!buf)
2964 		return -ENOMEM;
2965 
2966 	if (fe->cpu_dai->driver->playback.channels_min)
2967 		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2968 					buf + offset, out_count - offset);
2969 
2970 	if (fe->cpu_dai->driver->capture.channels_min)
2971 		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2972 					buf + offset, out_count - offset);
2973 
2974 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2975 
2976 	kfree(buf);
2977 	return ret;
2978 }
2979 
2980 static const struct file_operations dpcm_state_fops = {
2981 	.open = simple_open,
2982 	.read = dpcm_state_read_file,
2983 	.llseek = default_llseek,
2984 };
2985 
2986 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2987 {
2988 	if (!rtd->dai_link)
2989 		return;
2990 
2991 	if (!rtd->card->debugfs_card_root)
2992 		return;
2993 
2994 	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2995 			rtd->card->debugfs_card_root);
2996 	if (!rtd->debugfs_dpcm_root) {
2997 		dev_dbg(rtd->dev,
2998 			 "ASoC: Failed to create dpcm debugfs directory %s\n",
2999 			 rtd->dai_link->name);
3000 		return;
3001 	}
3002 
3003 	rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
3004 						rtd->debugfs_dpcm_root,
3005 						rtd, &dpcm_state_fops);
3006 }
3007 #endif
3008