• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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  */
snd_soc_dai_stream_valid(struct snd_soc_dai * dai,int stream)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 channels at all, it supports the stream */
52 	return codec_stream->channels_min;
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  */
snd_soc_runtime_activate(struct snd_soc_pcm_runtime * rtd,int stream)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  */
snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime * rtd,int stream)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  */
snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime * rtd)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  */
snd_soc_set_runtime_hwparams(struct snd_pcm_substream * substream,const struct snd_pcm_hardware * hw)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. */
dpcm_dapm_stream_event(struct snd_soc_pcm_runtime * fe,int dir,int event)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 
soc_pcm_apply_symmetry(struct snd_pcm_substream * substream,struct snd_soc_dai * soc_dai)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 
soc_pcm_params_symmetry(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 
soc_pcm_has_symmetry(struct snd_pcm_substream * substream)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 
soc_pcm_set_msb(struct snd_pcm_substream * substream,int bits)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 
soc_pcm_apply_msb(struct snd_pcm_substream * substream)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 
soc_pcm_init_runtime_hw(struct snd_pcm_substream * substream)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  */
soc_pcm_open(struct snd_pcm_substream * substream)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_component *component;
458 	struct snd_soc_rtdcom_list *rtdcom;
459 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
460 	struct snd_soc_dai *codec_dai;
461 	const char *codec_dai_name = "multicodec";
462 	int i, ret = 0;
463 
464 	pinctrl_pm_select_default_state(cpu_dai->dev);
465 	for (i = 0; i < rtd->num_codecs; i++)
466 		pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
467 
468 	for_each_rtdcom(rtd, rtdcom) {
469 		component = rtdcom->component;
470 
471 		pm_runtime_get_sync(component->dev);
472 	}
473 
474 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
475 
476 	/* startup the audio subsystem */
477 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
478 		ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
479 		if (ret < 0) {
480 			dev_err(cpu_dai->dev, "ASoC: can't open interface"
481 				" %s: %d\n", cpu_dai->name, ret);
482 			goto out;
483 		}
484 	}
485 
486 	if (platform->driver->ops && platform->driver->ops->open) {
487 		ret = platform->driver->ops->open(substream);
488 		if (ret < 0) {
489 			dev_err(platform->dev, "ASoC: can't open platform"
490 				" %s: %d\n", platform->component.name, ret);
491 			goto platform_err;
492 		}
493 	}
494 
495 	for (i = 0; i < rtd->num_codecs; i++) {
496 		codec_dai = rtd->codec_dais[i];
497 		if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
498 			ret = codec_dai->driver->ops->startup(substream,
499 							      codec_dai);
500 			if (ret < 0) {
501 				dev_err(codec_dai->dev,
502 					"ASoC: can't open codec %s: %d\n",
503 					codec_dai->name, ret);
504 				goto codec_dai_err;
505 			}
506 		}
507 
508 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
509 			codec_dai->tx_mask = 0;
510 		else
511 			codec_dai->rx_mask = 0;
512 	}
513 
514 	if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
515 		ret = rtd->dai_link->ops->startup(substream);
516 		if (ret < 0) {
517 			pr_err("ASoC: %s startup failed: %d\n",
518 			       rtd->dai_link->name, ret);
519 			goto machine_err;
520 		}
521 	}
522 
523 	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
524 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
525 		goto dynamic;
526 
527 	/* Check that the codec and cpu DAIs are compatible */
528 	soc_pcm_init_runtime_hw(substream);
529 
530 	if (rtd->num_codecs == 1)
531 		codec_dai_name = rtd->codec_dai->name;
532 
533 	if (soc_pcm_has_symmetry(substream))
534 		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
535 
536 	ret = -EINVAL;
537 	if (!runtime->hw.rates) {
538 		printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
539 			codec_dai_name, cpu_dai->name);
540 		goto config_err;
541 	}
542 	if (!runtime->hw.formats) {
543 		printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
544 			codec_dai_name, cpu_dai->name);
545 		goto config_err;
546 	}
547 	if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
548 	    runtime->hw.channels_min > runtime->hw.channels_max) {
549 		printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
550 				codec_dai_name, cpu_dai->name);
551 		goto config_err;
552 	}
553 
554 	soc_pcm_apply_msb(substream);
555 
556 	/* Symmetry only applies if we've already got an active stream. */
557 	if (cpu_dai->active) {
558 		ret = soc_pcm_apply_symmetry(substream, cpu_dai);
559 		if (ret != 0)
560 			goto config_err;
561 	}
562 
563 	for (i = 0; i < rtd->num_codecs; i++) {
564 		if (rtd->codec_dais[i]->active) {
565 			ret = soc_pcm_apply_symmetry(substream,
566 						     rtd->codec_dais[i]);
567 			if (ret != 0)
568 				goto config_err;
569 		}
570 	}
571 
572 	pr_debug("ASoC: %s <-> %s info:\n",
573 			codec_dai_name, cpu_dai->name);
574 	pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
575 	pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
576 		 runtime->hw.channels_max);
577 	pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
578 		 runtime->hw.rate_max);
579 
580 dynamic:
581 
582 	snd_soc_runtime_activate(rtd, substream->stream);
583 
584 	mutex_unlock(&rtd->pcm_mutex);
585 	return 0;
586 
587 config_err:
588 	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
589 		rtd->dai_link->ops->shutdown(substream);
590 
591 machine_err:
592 	i = rtd->num_codecs;
593 
594 codec_dai_err:
595 	while (--i >= 0) {
596 		codec_dai = rtd->codec_dais[i];
597 		if (codec_dai->driver->ops->shutdown)
598 			codec_dai->driver->ops->shutdown(substream, codec_dai);
599 	}
600 
601 	if (platform->driver->ops && platform->driver->ops->close)
602 		platform->driver->ops->close(substream);
603 
604 platform_err:
605 	if (cpu_dai->driver->ops->shutdown)
606 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
607 out:
608 	mutex_unlock(&rtd->pcm_mutex);
609 
610 	for_each_rtdcom(rtd, rtdcom) {
611 		component = rtdcom->component;
612 
613 		pm_runtime_mark_last_busy(component->dev);
614 		pm_runtime_put_autosuspend(component->dev);
615 	}
616 
617 	for (i = 0; i < rtd->num_codecs; i++) {
618 		if (!rtd->codec_dais[i]->active)
619 			pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
620 	}
621 	if (!cpu_dai->active)
622 		pinctrl_pm_select_sleep_state(cpu_dai->dev);
623 
624 	return ret;
625 }
626 
627 /*
628  * Power down the audio subsystem pmdown_time msecs after close is called.
629  * This is to ensure there are no pops or clicks in between any music tracks
630  * due to DAPM power cycling.
631  */
close_delayed_work(struct work_struct * work)632 static void close_delayed_work(struct work_struct *work)
633 {
634 	struct snd_soc_pcm_runtime *rtd =
635 			container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
636 	struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
637 
638 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
639 
640 	dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
641 		 codec_dai->driver->playback.stream_name,
642 		 codec_dai->playback_active ? "active" : "inactive",
643 		 rtd->pop_wait ? "yes" : "no");
644 
645 	/* are we waiting on this codec DAI stream */
646 	if (rtd->pop_wait == 1) {
647 		rtd->pop_wait = 0;
648 		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
649 					  SND_SOC_DAPM_STREAM_STOP);
650 	}
651 
652 	mutex_unlock(&rtd->pcm_mutex);
653 }
654 
655 /*
656  * Called by ALSA when a PCM substream is closed. Private data can be
657  * freed here. The cpu DAI, codec DAI, machine and platform are also
658  * shutdown.
659  */
soc_pcm_close(struct snd_pcm_substream * substream)660 static int soc_pcm_close(struct snd_pcm_substream *substream)
661 {
662 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
663 	struct snd_soc_platform *platform = rtd->platform;
664 	struct snd_soc_component *component;
665 	struct snd_soc_rtdcom_list *rtdcom;
666 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
667 	struct snd_soc_dai *codec_dai;
668 	int i;
669 
670 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
671 
672 	snd_soc_runtime_deactivate(rtd, substream->stream);
673 
674 	/* clear the corresponding DAIs rate when inactive */
675 	if (!cpu_dai->active)
676 		cpu_dai->rate = 0;
677 
678 	for (i = 0; i < rtd->num_codecs; i++) {
679 		codec_dai = rtd->codec_dais[i];
680 		if (!codec_dai->active)
681 			codec_dai->rate = 0;
682 	}
683 
684 	snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
685 
686 	if (cpu_dai->driver->ops->shutdown)
687 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
688 
689 	for (i = 0; i < rtd->num_codecs; i++) {
690 		codec_dai = rtd->codec_dais[i];
691 		if (codec_dai->driver->ops->shutdown)
692 			codec_dai->driver->ops->shutdown(substream, codec_dai);
693 	}
694 
695 	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
696 		rtd->dai_link->ops->shutdown(substream);
697 
698 	if (platform->driver->ops && platform->driver->ops->close)
699 		platform->driver->ops->close(substream);
700 
701 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
702 		if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
703 			/* powered down playback stream now */
704 			snd_soc_dapm_stream_event(rtd,
705 						  SNDRV_PCM_STREAM_PLAYBACK,
706 						  SND_SOC_DAPM_STREAM_STOP);
707 		} else {
708 			/* start delayed pop wq here for playback streams */
709 			rtd->pop_wait = 1;
710 			queue_delayed_work(system_power_efficient_wq,
711 					   &rtd->delayed_work,
712 					   msecs_to_jiffies(rtd->pmdown_time));
713 		}
714 	} else {
715 		/* capture streams can be powered down now */
716 		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
717 					  SND_SOC_DAPM_STREAM_STOP);
718 	}
719 
720 	mutex_unlock(&rtd->pcm_mutex);
721 
722 	for_each_rtdcom(rtd, rtdcom) {
723 		component = rtdcom->component;
724 
725 		pm_runtime_mark_last_busy(component->dev);
726 		pm_runtime_put_autosuspend(component->dev);
727 	}
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  */
soc_pcm_prepare(struct snd_pcm_substream * substream)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 
soc_pcm_codec_params_fixup(struct snd_pcm_hw_params * params,unsigned int mask)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 
soc_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)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  */
soc_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
898 		    codec_dai->tx_mask)
899 			soc_pcm_codec_params_fixup(&codec_params,
900 						   codec_dai->tx_mask);
901 
902 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
903 		    codec_dai->rx_mask)
904 			soc_pcm_codec_params_fixup(&codec_params,
905 						   codec_dai->rx_mask);
906 
907 		ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
908 		if(ret < 0)
909 			goto codec_err;
910 
911 		codec_dai->rate = params_rate(&codec_params);
912 		codec_dai->channels = params_channels(&codec_params);
913 		codec_dai->sample_bits = snd_pcm_format_physical_width(
914 						params_format(&codec_params));
915 	}
916 
917 	ret = soc_dai_hw_params(substream, params, cpu_dai);
918 	if (ret < 0)
919 		goto interface_err;
920 
921 	if (platform->driver->ops && platform->driver->ops->hw_params) {
922 		ret = platform->driver->ops->hw_params(substream, params);
923 		if (ret < 0) {
924 			dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
925 			       platform->component.name, ret);
926 			goto platform_err;
927 		}
928 	}
929 
930 	/* store the parameters for each DAIs */
931 	cpu_dai->rate = params_rate(params);
932 	cpu_dai->channels = params_channels(params);
933 	cpu_dai->sample_bits =
934 		snd_pcm_format_physical_width(params_format(params));
935 
936 out:
937 	mutex_unlock(&rtd->pcm_mutex);
938 	return ret;
939 
940 platform_err:
941 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
942 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
943 
944 interface_err:
945 	i = rtd->num_codecs;
946 
947 codec_err:
948 	while (--i >= 0) {
949 		struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
950 		if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
951 			codec_dai->driver->ops->hw_free(substream, codec_dai);
952 		codec_dai->rate = 0;
953 	}
954 
955 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
956 		rtd->dai_link->ops->hw_free(substream);
957 
958 	mutex_unlock(&rtd->pcm_mutex);
959 	return ret;
960 }
961 
962 /*
963  * Frees resources allocated by hw_params, can be called multiple times
964  */
soc_pcm_hw_free(struct snd_pcm_substream * substream)965 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
966 {
967 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
968 	struct snd_soc_platform *platform = rtd->platform;
969 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
970 	struct snd_soc_dai *codec_dai;
971 	bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
972 	int i;
973 
974 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
975 
976 	/* clear the corresponding DAIs parameters when going to be inactive */
977 	if (cpu_dai->active == 1) {
978 		cpu_dai->rate = 0;
979 		cpu_dai->channels = 0;
980 		cpu_dai->sample_bits = 0;
981 	}
982 
983 	for (i = 0; i < rtd->num_codecs; i++) {
984 		codec_dai = rtd->codec_dais[i];
985 		if (codec_dai->active == 1) {
986 			codec_dai->rate = 0;
987 			codec_dai->channels = 0;
988 			codec_dai->sample_bits = 0;
989 		}
990 	}
991 
992 	/* apply codec digital mute */
993 	for (i = 0; i < rtd->num_codecs; i++) {
994 		if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
995 		    (!playback && rtd->codec_dais[i]->capture_active == 1))
996 			snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
997 						 substream->stream);
998 	}
999 
1000 	/* free any machine hw params */
1001 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
1002 		rtd->dai_link->ops->hw_free(substream);
1003 
1004 	/* free any DMA resources */
1005 	if (platform->driver->ops && platform->driver->ops->hw_free)
1006 		platform->driver->ops->hw_free(substream);
1007 
1008 	/* now free hw params for the DAIs  */
1009 	for (i = 0; i < rtd->num_codecs; i++) {
1010 		codec_dai = rtd->codec_dais[i];
1011 		if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
1012 			codec_dai->driver->ops->hw_free(substream, codec_dai);
1013 	}
1014 
1015 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
1016 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
1017 
1018 	mutex_unlock(&rtd->pcm_mutex);
1019 	return 0;
1020 }
1021 
soc_pcm_trigger(struct snd_pcm_substream * substream,int cmd)1022 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1023 {
1024 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1025 	struct snd_soc_platform *platform = rtd->platform;
1026 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1027 	struct snd_soc_dai *codec_dai;
1028 	int i, ret;
1029 
1030 	for (i = 0; i < rtd->num_codecs; i++) {
1031 		codec_dai = rtd->codec_dais[i];
1032 		if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
1033 			ret = codec_dai->driver->ops->trigger(substream,
1034 							      cmd, codec_dai);
1035 			if (ret < 0)
1036 				return ret;
1037 		}
1038 	}
1039 
1040 	if (platform->driver->ops && platform->driver->ops->trigger) {
1041 		ret = platform->driver->ops->trigger(substream, cmd);
1042 		if (ret < 0)
1043 			return ret;
1044 	}
1045 
1046 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
1047 		ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
1048 		if (ret < 0)
1049 			return ret;
1050 	}
1051 
1052 	if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1053 		ret = rtd->dai_link->ops->trigger(substream, cmd);
1054 		if (ret < 0)
1055 			return ret;
1056 	}
1057 
1058 	return 0;
1059 }
1060 
soc_pcm_bespoke_trigger(struct snd_pcm_substream * substream,int cmd)1061 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1062 				   int cmd)
1063 {
1064 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1065 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1066 	struct snd_soc_dai *codec_dai;
1067 	int i, ret;
1068 
1069 	for (i = 0; i < rtd->num_codecs; i++) {
1070 		codec_dai = rtd->codec_dais[i];
1071 		if (codec_dai->driver->ops &&
1072 		    codec_dai->driver->ops->bespoke_trigger) {
1073 			ret = codec_dai->driver->ops->bespoke_trigger(substream,
1074 								cmd, codec_dai);
1075 			if (ret < 0)
1076 				return ret;
1077 		}
1078 	}
1079 
1080 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1081 		ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1082 		if (ret < 0)
1083 			return ret;
1084 	}
1085 	return 0;
1086 }
1087 /*
1088  * soc level wrapper for pointer callback
1089  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1090  * the runtime->delay will be updated accordingly.
1091  */
soc_pcm_pointer(struct snd_pcm_substream * substream)1092 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1093 {
1094 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1095 	struct snd_soc_platform *platform = rtd->platform;
1096 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1097 	struct snd_soc_dai *codec_dai;
1098 	struct snd_pcm_runtime *runtime = substream->runtime;
1099 	snd_pcm_uframes_t offset = 0;
1100 	snd_pcm_sframes_t delay = 0;
1101 	snd_pcm_sframes_t codec_delay = 0;
1102 	int i;
1103 
1104 	if (platform->driver->ops && platform->driver->ops->pointer)
1105 		offset = platform->driver->ops->pointer(substream);
1106 
1107 	if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1108 		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1109 
1110 	for (i = 0; i < rtd->num_codecs; i++) {
1111 		codec_dai = rtd->codec_dais[i];
1112 		if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1113 			codec_delay = max(codec_delay,
1114 					codec_dai->driver->ops->delay(substream,
1115 								    codec_dai));
1116 	}
1117 	delay += codec_delay;
1118 
1119 	runtime->delay = delay;
1120 
1121 	return offset;
1122 }
1123 
1124 /* connect a FE and BE */
dpcm_be_connect(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1125 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1126 		struct snd_soc_pcm_runtime *be, int stream)
1127 {
1128 	struct snd_soc_dpcm *dpcm;
1129 
1130 	/* only add new dpcms */
1131 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1132 		if (dpcm->be == be && dpcm->fe == fe)
1133 			return 0;
1134 	}
1135 
1136 	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1137 	if (!dpcm)
1138 		return -ENOMEM;
1139 
1140 	dpcm->be = be;
1141 	dpcm->fe = fe;
1142 	be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1143 	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1144 	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1145 	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1146 
1147 	dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1148 			stream ? "capture" : "playback",  fe->dai_link->name,
1149 			stream ? "<-" : "->", be->dai_link->name);
1150 
1151 #ifdef CONFIG_DEBUG_FS
1152 	if (fe->debugfs_dpcm_root)
1153 		dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1154 				fe->debugfs_dpcm_root, &dpcm->state);
1155 #endif
1156 	return 1;
1157 }
1158 
1159 /* reparent a BE onto another FE */
dpcm_be_reparent(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1160 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1161 			struct snd_soc_pcm_runtime *be, int stream)
1162 {
1163 	struct snd_soc_dpcm *dpcm;
1164 	struct snd_pcm_substream *fe_substream, *be_substream;
1165 
1166 	/* reparent if BE is connected to other FEs */
1167 	if (!be->dpcm[stream].users)
1168 		return;
1169 
1170 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1171 
1172 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1173 		if (dpcm->fe == fe)
1174 			continue;
1175 
1176 		dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1177 			stream ? "capture" : "playback",
1178 			dpcm->fe->dai_link->name,
1179 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1180 
1181 		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1182 		be_substream->runtime = fe_substream->runtime;
1183 		break;
1184 	}
1185 }
1186 
1187 /* disconnect a BE and FE */
dpcm_be_disconnect(struct snd_soc_pcm_runtime * fe,int stream)1188 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1189 {
1190 	struct snd_soc_dpcm *dpcm, *d;
1191 
1192 	list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1193 		dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1194 				stream ? "capture" : "playback",
1195 				dpcm->be->dai_link->name);
1196 
1197 		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1198 			continue;
1199 
1200 		dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1201 			stream ? "capture" : "playback", fe->dai_link->name,
1202 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1203 
1204 		/* BEs still alive need new FE */
1205 		dpcm_be_reparent(fe, dpcm->be, stream);
1206 
1207 #ifdef CONFIG_DEBUG_FS
1208 		debugfs_remove(dpcm->debugfs_state);
1209 #endif
1210 		list_del(&dpcm->list_be);
1211 		list_del(&dpcm->list_fe);
1212 		kfree(dpcm);
1213 	}
1214 }
1215 
1216 /* get BE for DAI widget and stream */
dpcm_get_be(struct snd_soc_card * card,struct snd_soc_dapm_widget * widget,int stream)1217 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1218 		struct snd_soc_dapm_widget *widget, int stream)
1219 {
1220 	struct snd_soc_pcm_runtime *be;
1221 	int i;
1222 
1223 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1224 		list_for_each_entry(be, &card->rtd_list, list) {
1225 
1226 			if (!be->dai_link->no_pcm)
1227 				continue;
1228 
1229 			if (be->cpu_dai->playback_widget == widget)
1230 				return be;
1231 
1232 			for (i = 0; i < be->num_codecs; i++) {
1233 				struct snd_soc_dai *dai = be->codec_dais[i];
1234 				if (dai->playback_widget == widget)
1235 					return be;
1236 			}
1237 		}
1238 	} else {
1239 
1240 		list_for_each_entry(be, &card->rtd_list, list) {
1241 
1242 			if (!be->dai_link->no_pcm)
1243 				continue;
1244 
1245 			if (be->cpu_dai->capture_widget == widget)
1246 				return be;
1247 
1248 			for (i = 0; i < be->num_codecs; i++) {
1249 				struct snd_soc_dai *dai = be->codec_dais[i];
1250 				if (dai->capture_widget == widget)
1251 					return be;
1252 			}
1253 		}
1254 	}
1255 
1256 	dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1257 		stream ? "capture" : "playback", widget->name);
1258 	return NULL;
1259 }
1260 
1261 static inline struct snd_soc_dapm_widget *
dai_get_widget(struct snd_soc_dai * dai,int stream)1262 	dai_get_widget(struct snd_soc_dai *dai, int stream)
1263 {
1264 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1265 		return dai->playback_widget;
1266 	else
1267 		return dai->capture_widget;
1268 }
1269 
widget_in_list(struct snd_soc_dapm_widget_list * list,struct snd_soc_dapm_widget * widget)1270 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1271 		struct snd_soc_dapm_widget *widget)
1272 {
1273 	int i;
1274 
1275 	for (i = 0; i < list->num_widgets; i++) {
1276 		if (widget == list->widgets[i])
1277 			return 1;
1278 	}
1279 
1280 	return 0;
1281 }
1282 
dpcm_end_walk_at_be(struct snd_soc_dapm_widget * widget,enum snd_soc_dapm_direction dir)1283 static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,
1284 		enum snd_soc_dapm_direction dir)
1285 {
1286 	struct snd_soc_card *card = widget->dapm->card;
1287 	struct snd_soc_pcm_runtime *rtd;
1288 	int i;
1289 
1290 	if (dir == SND_SOC_DAPM_DIR_OUT) {
1291 		list_for_each_entry(rtd, &card->rtd_list, list) {
1292 			if (!rtd->dai_link->no_pcm)
1293 				continue;
1294 
1295 			if (rtd->cpu_dai->playback_widget == widget)
1296 				return true;
1297 
1298 			for (i = 0; i < rtd->num_codecs; ++i) {
1299 				struct snd_soc_dai *dai = rtd->codec_dais[i];
1300 				if (dai->playback_widget == widget)
1301 					return true;
1302 			}
1303 		}
1304 	} else { /* SND_SOC_DAPM_DIR_IN */
1305 		list_for_each_entry(rtd, &card->rtd_list, list) {
1306 			if (!rtd->dai_link->no_pcm)
1307 				continue;
1308 
1309 			if (rtd->cpu_dai->capture_widget == widget)
1310 				return true;
1311 
1312 			for (i = 0; i < rtd->num_codecs; ++i) {
1313 				struct snd_soc_dai *dai = rtd->codec_dais[i];
1314 				if (dai->capture_widget == widget)
1315 					return true;
1316 			}
1317 		}
1318 	}
1319 
1320 	return false;
1321 }
1322 
dpcm_path_get(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list)1323 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1324 	int stream, struct snd_soc_dapm_widget_list **list)
1325 {
1326 	struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1327 	int paths;
1328 
1329 	/* get number of valid DAI paths and their widgets */
1330 	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1331 			dpcm_end_walk_at_be);
1332 
1333 	dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1334 			stream ? "capture" : "playback");
1335 
1336 	return paths;
1337 }
1338 
dpcm_prune_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1339 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1340 	struct snd_soc_dapm_widget_list **list_)
1341 {
1342 	struct snd_soc_dpcm *dpcm;
1343 	struct snd_soc_dapm_widget_list *list = *list_;
1344 	struct snd_soc_dapm_widget *widget;
1345 	int prune = 0;
1346 
1347 	/* Destroy any old FE <--> BE connections */
1348 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1349 		unsigned int i;
1350 
1351 		/* is there a valid CPU DAI widget for this BE */
1352 		widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1353 
1354 		/* prune the BE if it's no longer in our active list */
1355 		if (widget && widget_in_list(list, widget))
1356 			continue;
1357 
1358 		/* is there a valid CODEC DAI widget for this BE */
1359 		for (i = 0; i < dpcm->be->num_codecs; i++) {
1360 			struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1361 			widget = dai_get_widget(dai, stream);
1362 
1363 			/* prune the BE if it's no longer in our active list */
1364 			if (widget && widget_in_list(list, widget))
1365 				continue;
1366 		}
1367 
1368 		dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1369 			stream ? "capture" : "playback",
1370 			dpcm->be->dai_link->name, fe->dai_link->name);
1371 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1372 		dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1373 		prune++;
1374 	}
1375 
1376 	dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1377 	return prune;
1378 }
1379 
dpcm_add_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1380 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1381 	struct snd_soc_dapm_widget_list **list_)
1382 {
1383 	struct snd_soc_card *card = fe->card;
1384 	struct snd_soc_dapm_widget_list *list = *list_;
1385 	struct snd_soc_pcm_runtime *be;
1386 	int i, new = 0, err;
1387 
1388 	/* Create any new FE <--> BE connections */
1389 	for (i = 0; i < list->num_widgets; i++) {
1390 
1391 		switch (list->widgets[i]->id) {
1392 		case snd_soc_dapm_dai_in:
1393 			if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1394 				continue;
1395 			break;
1396 		case snd_soc_dapm_dai_out:
1397 			if (stream != SNDRV_PCM_STREAM_CAPTURE)
1398 				continue;
1399 			break;
1400 		default:
1401 			continue;
1402 		}
1403 
1404 		/* is there a valid BE rtd for this widget */
1405 		be = dpcm_get_be(card, list->widgets[i], stream);
1406 		if (!be) {
1407 			dev_err(fe->dev, "ASoC: no BE found for %s\n",
1408 					list->widgets[i]->name);
1409 			continue;
1410 		}
1411 
1412 		/* make sure BE is a real BE */
1413 		if (!be->dai_link->no_pcm)
1414 			continue;
1415 
1416 		/* don't connect if FE is not running */
1417 		if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1418 			continue;
1419 
1420 		/* newly connected FE and BE */
1421 		err = dpcm_be_connect(fe, be, stream);
1422 		if (err < 0) {
1423 			dev_err(fe->dev, "ASoC: can't connect %s\n",
1424 				list->widgets[i]->name);
1425 			break;
1426 		} else if (err == 0) /* already connected */
1427 			continue;
1428 
1429 		/* new */
1430 		be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1431 		new++;
1432 	}
1433 
1434 	dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1435 	return new;
1436 }
1437 
1438 /*
1439  * Find the corresponding BE DAIs that source or sink audio to this
1440  * FE substream.
1441  */
dpcm_process_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list,int new)1442 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1443 	int stream, struct snd_soc_dapm_widget_list **list, int new)
1444 {
1445 	if (new)
1446 		return dpcm_add_paths(fe, stream, list);
1447 	else
1448 		return dpcm_prune_paths(fe, stream, list);
1449 }
1450 
dpcm_clear_pending_state(struct snd_soc_pcm_runtime * fe,int stream)1451 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1452 {
1453 	struct snd_soc_dpcm *dpcm;
1454 
1455 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1456 		dpcm->be->dpcm[stream].runtime_update =
1457 						SND_SOC_DPCM_UPDATE_NO;
1458 }
1459 
dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime * fe,int stream)1460 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1461 	int stream)
1462 {
1463 	struct snd_soc_dpcm *dpcm;
1464 
1465 	/* disable any enabled and non active backends */
1466 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1467 
1468 		struct snd_soc_pcm_runtime *be = dpcm->be;
1469 		struct snd_pcm_substream *be_substream =
1470 			snd_soc_dpcm_get_substream(be, stream);
1471 
1472 		if (be->dpcm[stream].users == 0)
1473 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1474 				stream ? "capture" : "playback",
1475 				be->dpcm[stream].state);
1476 
1477 		if (--be->dpcm[stream].users != 0)
1478 			continue;
1479 
1480 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1481 			continue;
1482 
1483 		soc_pcm_close(be_substream);
1484 		be_substream->runtime = NULL;
1485 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1486 	}
1487 }
1488 
dpcm_be_dai_startup(struct snd_soc_pcm_runtime * fe,int stream)1489 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1490 {
1491 	struct snd_soc_dpcm *dpcm;
1492 	int err, count = 0;
1493 
1494 	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
1495 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1496 
1497 		struct snd_soc_pcm_runtime *be = dpcm->be;
1498 		struct snd_pcm_substream *be_substream =
1499 			snd_soc_dpcm_get_substream(be, stream);
1500 
1501 		if (!be_substream) {
1502 			dev_err(be->dev, "ASoC: no backend %s stream\n",
1503 				stream ? "capture" : "playback");
1504 			continue;
1505 		}
1506 
1507 		/* is this op for this BE ? */
1508 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1509 			continue;
1510 
1511 		/* first time the dpcm is open ? */
1512 		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1513 			dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1514 				stream ? "capture" : "playback",
1515 				be->dpcm[stream].state);
1516 
1517 		if (be->dpcm[stream].users++ != 0)
1518 			continue;
1519 
1520 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1521 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1522 			continue;
1523 
1524 		dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1525 			stream ? "capture" : "playback", be->dai_link->name);
1526 
1527 		be_substream->runtime = be->dpcm[stream].runtime;
1528 		err = soc_pcm_open(be_substream);
1529 		if (err < 0) {
1530 			dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1531 			be->dpcm[stream].users--;
1532 			if (be->dpcm[stream].users < 0)
1533 				dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1534 					stream ? "capture" : "playback",
1535 					be->dpcm[stream].state);
1536 
1537 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1538 			goto unwind;
1539 		}
1540 
1541 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1542 		count++;
1543 	}
1544 
1545 	return count;
1546 
1547 unwind:
1548 	/* disable any enabled and non active backends */
1549 	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1550 		struct snd_soc_pcm_runtime *be = dpcm->be;
1551 		struct snd_pcm_substream *be_substream =
1552 			snd_soc_dpcm_get_substream(be, stream);
1553 
1554 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1555 			continue;
1556 
1557 		if (be->dpcm[stream].users == 0)
1558 			dev_err(be->dev, "ASoC: no users %s at close %d\n",
1559 				stream ? "capture" : "playback",
1560 				be->dpcm[stream].state);
1561 
1562 		if (--be->dpcm[stream].users != 0)
1563 			continue;
1564 
1565 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1566 			continue;
1567 
1568 		soc_pcm_close(be_substream);
1569 		be_substream->runtime = NULL;
1570 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1571 	}
1572 
1573 	return err;
1574 }
1575 
dpcm_init_runtime_hw(struct snd_pcm_runtime * runtime,struct snd_soc_pcm_stream * stream,u64 formats)1576 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1577 				 struct snd_soc_pcm_stream *stream,
1578 				 u64 formats)
1579 {
1580 	runtime->hw.rate_min = stream->rate_min;
1581 	runtime->hw.rate_max = min_not_zero(stream->rate_max, UINT_MAX);
1582 	runtime->hw.channels_min = stream->channels_min;
1583 	runtime->hw.channels_max = stream->channels_max;
1584 	if (runtime->hw.formats)
1585 		runtime->hw.formats &= formats & stream->formats;
1586 	else
1587 		runtime->hw.formats = formats & stream->formats;
1588 	runtime->hw.rates = stream->rates;
1589 }
1590 
dpcm_runtime_base_format(struct snd_pcm_substream * substream)1591 static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
1592 {
1593 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1594 	struct snd_soc_dpcm *dpcm;
1595 	u64 formats = ULLONG_MAX;
1596 	int stream = substream->stream;
1597 
1598 	if (!fe->dai_link->dpcm_merged_format)
1599 		return formats;
1600 
1601 	/*
1602 	 * It returns merged BE codec format
1603 	 * if FE want to use it (= dpcm_merged_format)
1604 	 */
1605 
1606 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1607 		struct snd_soc_pcm_runtime *be = dpcm->be;
1608 		struct snd_soc_dai_driver *codec_dai_drv;
1609 		struct snd_soc_pcm_stream *codec_stream;
1610 		int i;
1611 
1612 		for (i = 0; i < be->num_codecs; i++) {
1613 			/*
1614 			 * Skip CODECs which don't support the current stream
1615 			 * type. See soc_pcm_init_runtime_hw() for more details
1616 			 */
1617 			if (!snd_soc_dai_stream_valid(be->codec_dais[i],
1618 						      stream))
1619 				continue;
1620 
1621 			codec_dai_drv = be->codec_dais[i]->driver;
1622 			if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1623 				codec_stream = &codec_dai_drv->playback;
1624 			else
1625 				codec_stream = &codec_dai_drv->capture;
1626 
1627 			formats &= codec_stream->formats;
1628 		}
1629 	}
1630 
1631 	return formats;
1632 }
1633 
dpcm_set_fe_runtime(struct snd_pcm_substream * substream)1634 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1635 {
1636 	struct snd_pcm_runtime *runtime = substream->runtime;
1637 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
1638 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1639 	struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1640 	u64 format = dpcm_runtime_base_format(substream);
1641 
1642 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1643 		dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback, format);
1644 	else
1645 		dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture, format);
1646 }
1647 
1648 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1649 
1650 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1651  * for avoiding the race with trigger callback.
1652  * If the state is unset and a trigger is pending while the previous operation,
1653  * process the pending trigger action here.
1654  */
dpcm_set_fe_update_state(struct snd_soc_pcm_runtime * fe,int stream,enum snd_soc_dpcm_update state)1655 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1656 				     int stream, enum snd_soc_dpcm_update state)
1657 {
1658 	struct snd_pcm_substream *substream =
1659 		snd_soc_dpcm_get_substream(fe, stream);
1660 
1661 	snd_pcm_stream_lock_irq(substream);
1662 	if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1663 		dpcm_fe_dai_do_trigger(substream,
1664 				       fe->dpcm[stream].trigger_pending - 1);
1665 		fe->dpcm[stream].trigger_pending = 0;
1666 	}
1667 	fe->dpcm[stream].runtime_update = state;
1668 	snd_pcm_stream_unlock_irq(substream);
1669 }
1670 
dpcm_apply_symmetry(struct snd_pcm_substream * fe_substream,int stream)1671 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1672 			       int stream)
1673 {
1674 	struct snd_soc_dpcm *dpcm;
1675 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1676 	struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
1677 	int err;
1678 
1679 	/* apply symmetry for FE */
1680 	if (soc_pcm_has_symmetry(fe_substream))
1681 		fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1682 
1683 	/* Symmetry only applies if we've got an active stream. */
1684 	if (fe_cpu_dai->active) {
1685 		err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1686 		if (err < 0)
1687 			return err;
1688 	}
1689 
1690 	/* apply symmetry for BE */
1691 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1692 		struct snd_soc_pcm_runtime *be = dpcm->be;
1693 		struct snd_pcm_substream *be_substream =
1694 			snd_soc_dpcm_get_substream(be, stream);
1695 		struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
1696 		int i;
1697 
1698 		if (rtd->dai_link->be_hw_params_fixup)
1699 			continue;
1700 
1701 		if (soc_pcm_has_symmetry(be_substream))
1702 			be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
1703 
1704 		/* Symmetry only applies if we've got an active stream. */
1705 		if (rtd->cpu_dai->active) {
1706 			err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
1707 			if (err < 0)
1708 				return err;
1709 		}
1710 
1711 		for (i = 0; i < rtd->num_codecs; i++) {
1712 			if (rtd->codec_dais[i]->active) {
1713 				err = soc_pcm_apply_symmetry(be_substream,
1714 							     rtd->codec_dais[i]);
1715 				if (err < 0)
1716 					return err;
1717 			}
1718 		}
1719 	}
1720 
1721 	return 0;
1722 }
1723 
dpcm_fe_dai_startup(struct snd_pcm_substream * fe_substream)1724 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1725 {
1726 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1727 	struct snd_pcm_runtime *runtime = fe_substream->runtime;
1728 	int stream = fe_substream->stream, ret = 0;
1729 
1730 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1731 
1732 	ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1733 	if (ret < 0) {
1734 		dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1735 		goto be_err;
1736 	}
1737 
1738 	dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1739 
1740 	/* start the DAI frontend */
1741 	ret = soc_pcm_open(fe_substream);
1742 	if (ret < 0) {
1743 		dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1744 		goto unwind;
1745 	}
1746 
1747 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1748 
1749 	dpcm_set_fe_runtime(fe_substream);
1750 	snd_pcm_limit_hw_rates(runtime);
1751 
1752 	ret = dpcm_apply_symmetry(fe_substream, stream);
1753 	if (ret < 0) {
1754 		dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
1755 			ret);
1756 		goto unwind;
1757 	}
1758 
1759 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1760 	return 0;
1761 
1762 unwind:
1763 	dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1764 be_err:
1765 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1766 	return ret;
1767 }
1768 
dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime * fe,int stream)1769 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1770 {
1771 	struct snd_soc_dpcm *dpcm;
1772 
1773 	/* only shutdown BEs that are either sinks or sources to this FE DAI */
1774 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1775 
1776 		struct snd_soc_pcm_runtime *be = dpcm->be;
1777 		struct snd_pcm_substream *be_substream =
1778 			snd_soc_dpcm_get_substream(be, stream);
1779 
1780 		/* is this op for this BE ? */
1781 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1782 			continue;
1783 
1784 		if (be->dpcm[stream].users == 0)
1785 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1786 				stream ? "capture" : "playback",
1787 				be->dpcm[stream].state);
1788 
1789 		if (--be->dpcm[stream].users != 0)
1790 			continue;
1791 
1792 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1793 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)) {
1794 			soc_pcm_hw_free(be_substream);
1795 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1796 		}
1797 
1798 		dev_dbg(be->dev, "ASoC: close BE %s\n",
1799 			be->dai_link->name);
1800 
1801 		soc_pcm_close(be_substream);
1802 		be_substream->runtime = NULL;
1803 
1804 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1805 	}
1806 	return 0;
1807 }
1808 
dpcm_fe_dai_shutdown(struct snd_pcm_substream * substream)1809 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1810 {
1811 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1812 	int stream = substream->stream;
1813 
1814 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1815 
1816 	/* shutdown the BEs */
1817 	dpcm_be_dai_shutdown(fe, substream->stream);
1818 
1819 	dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1820 
1821 	/* now shutdown the frontend */
1822 	soc_pcm_close(substream);
1823 
1824 	/* run the stream event for each BE */
1825 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1826 
1827 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1828 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1829 	return 0;
1830 }
1831 
dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime * fe,int stream)1832 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1833 {
1834 	struct snd_soc_dpcm *dpcm;
1835 
1836 	/* only hw_params backends that are either sinks or sources
1837 	 * to this frontend DAI */
1838 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1839 
1840 		struct snd_soc_pcm_runtime *be = dpcm->be;
1841 		struct snd_pcm_substream *be_substream =
1842 			snd_soc_dpcm_get_substream(be, stream);
1843 
1844 		/* is this op for this BE ? */
1845 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1846 			continue;
1847 
1848 		/* only free hw when no longer used - check all FEs */
1849 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1850 				continue;
1851 
1852 		/* do not free hw if this BE is used by other FE */
1853 		if (be->dpcm[stream].users > 1)
1854 			continue;
1855 
1856 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1857 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1858 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1859 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1860 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1861 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1862 			continue;
1863 
1864 		dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1865 			be->dai_link->name);
1866 
1867 		soc_pcm_hw_free(be_substream);
1868 
1869 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1870 	}
1871 
1872 	return 0;
1873 }
1874 
dpcm_fe_dai_hw_free(struct snd_pcm_substream * substream)1875 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1876 {
1877 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1878 	int err, stream = substream->stream;
1879 
1880 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1881 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1882 
1883 	dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1884 
1885 	/* call hw_free on the frontend */
1886 	err = soc_pcm_hw_free(substream);
1887 	if (err < 0)
1888 		dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1889 			fe->dai_link->name);
1890 
1891 	/* only hw_params backends that are either sinks or sources
1892 	 * to this frontend DAI */
1893 	err = dpcm_be_dai_hw_free(fe, stream);
1894 
1895 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1896 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1897 
1898 	mutex_unlock(&fe->card->mutex);
1899 	return 0;
1900 }
1901 
dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime * fe,int stream)1902 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1903 {
1904 	struct snd_soc_dpcm *dpcm;
1905 	int ret;
1906 
1907 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1908 
1909 		struct snd_soc_pcm_runtime *be = dpcm->be;
1910 		struct snd_pcm_substream *be_substream =
1911 			snd_soc_dpcm_get_substream(be, stream);
1912 
1913 		/* is this op for this BE ? */
1914 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1915 			continue;
1916 
1917 		/* copy params for each dpcm */
1918 		memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1919 				sizeof(struct snd_pcm_hw_params));
1920 
1921 		/* perform any hw_params fixups */
1922 		if (be->dai_link->be_hw_params_fixup) {
1923 			ret = be->dai_link->be_hw_params_fixup(be,
1924 					&dpcm->hw_params);
1925 			if (ret < 0) {
1926 				dev_err(be->dev,
1927 					"ASoC: hw_params BE fixup failed %d\n",
1928 					ret);
1929 				goto unwind;
1930 			}
1931 		}
1932 
1933 		/* only allow hw_params() if no connected FEs are running */
1934 		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1935 			continue;
1936 
1937 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1938 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1939 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1940 			continue;
1941 
1942 		dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1943 			be->dai_link->name);
1944 
1945 		ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1946 		if (ret < 0) {
1947 			dev_err(dpcm->be->dev,
1948 				"ASoC: hw_params BE failed %d\n", ret);
1949 			goto unwind;
1950 		}
1951 
1952 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1953 	}
1954 	return 0;
1955 
1956 unwind:
1957 	/* disable any enabled and non active backends */
1958 	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1959 		struct snd_soc_pcm_runtime *be = dpcm->be;
1960 		struct snd_pcm_substream *be_substream =
1961 			snd_soc_dpcm_get_substream(be, stream);
1962 
1963 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1964 			continue;
1965 
1966 		/* only allow hw_free() if no connected FEs are running */
1967 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1968 			continue;
1969 
1970 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1971 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1972 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1973 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1974 			continue;
1975 
1976 		soc_pcm_hw_free(be_substream);
1977 	}
1978 
1979 	return ret;
1980 }
1981 
dpcm_fe_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)1982 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1983 				 struct snd_pcm_hw_params *params)
1984 {
1985 	struct snd_soc_pcm_runtime *fe = substream->private_data;
1986 	int ret, stream = substream->stream;
1987 
1988 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1989 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1990 
1991 	memcpy(&fe->dpcm[substream->stream].hw_params, params,
1992 			sizeof(struct snd_pcm_hw_params));
1993 	ret = dpcm_be_dai_hw_params(fe, substream->stream);
1994 	if (ret < 0) {
1995 		dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1996 		goto out;
1997 	}
1998 
1999 	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2000 			fe->dai_link->name, params_rate(params),
2001 			params_channels(params), params_format(params));
2002 
2003 	/* call hw_params on the frontend */
2004 	ret = soc_pcm_hw_params(substream, params);
2005 	if (ret < 0) {
2006 		dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
2007 		dpcm_be_dai_hw_free(fe, stream);
2008 	 } else
2009 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2010 
2011 out:
2012 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2013 	mutex_unlock(&fe->card->mutex);
2014 	return ret;
2015 }
2016 
dpcm_do_trigger(struct snd_soc_dpcm * dpcm,struct snd_pcm_substream * substream,int cmd)2017 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
2018 		struct snd_pcm_substream *substream, int cmd)
2019 {
2020 	int ret;
2021 
2022 	dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
2023 			dpcm->be->dai_link->name, cmd);
2024 
2025 	ret = soc_pcm_trigger(substream, cmd);
2026 	if (ret < 0)
2027 		dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
2028 
2029 	return ret;
2030 }
2031 
dpcm_be_dai_trigger(struct snd_soc_pcm_runtime * fe,int stream,int cmd)2032 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2033 			       int cmd)
2034 {
2035 	struct snd_soc_dpcm *dpcm;
2036 	int ret = 0;
2037 
2038 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2039 
2040 		struct snd_soc_pcm_runtime *be = dpcm->be;
2041 		struct snd_pcm_substream *be_substream =
2042 			snd_soc_dpcm_get_substream(be, stream);
2043 
2044 		/* is this op for this BE ? */
2045 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2046 			continue;
2047 
2048 		switch (cmd) {
2049 		case SNDRV_PCM_TRIGGER_START:
2050 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2051 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2052 				continue;
2053 
2054 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2055 			if (ret)
2056 				return ret;
2057 
2058 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2059 			break;
2060 		case SNDRV_PCM_TRIGGER_RESUME:
2061 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2062 				continue;
2063 
2064 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2065 			if (ret)
2066 				return ret;
2067 
2068 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2069 			break;
2070 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2071 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
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_START;
2079 			break;
2080 		case SNDRV_PCM_TRIGGER_STOP:
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_STOP;
2092 			break;
2093 		case SNDRV_PCM_TRIGGER_SUSPEND:
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_SUSPEND;
2105 			break;
2106 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2107 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2108 				continue;
2109 
2110 			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2111 				continue;
2112 
2113 			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
2114 			if (ret)
2115 				return ret;
2116 
2117 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2118 			break;
2119 		}
2120 	}
2121 
2122 	return ret;
2123 }
2124 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2125 
dpcm_dai_trigger_fe_be(struct snd_pcm_substream * substream,int cmd,bool fe_first)2126 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2127 				  int cmd, bool fe_first)
2128 {
2129 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2130 	int ret;
2131 
2132 	/* call trigger on the frontend before the backend. */
2133 	if (fe_first) {
2134 		dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2135 			fe->dai_link->name, cmd);
2136 
2137 		ret = soc_pcm_trigger(substream, cmd);
2138 		if (ret < 0)
2139 			return ret;
2140 
2141 		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2142 		return ret;
2143 	}
2144 
2145 	/* call trigger on the frontend after the backend. */
2146 	ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2147 	if (ret < 0)
2148 		return ret;
2149 
2150 	dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2151 		fe->dai_link->name, cmd);
2152 
2153 	ret = soc_pcm_trigger(substream, cmd);
2154 
2155 	return ret;
2156 }
2157 
dpcm_fe_dai_do_trigger(struct snd_pcm_substream * substream,int cmd)2158 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2159 {
2160 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2161 	int stream = substream->stream;
2162 	int ret = 0;
2163 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2164 
2165 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2166 
2167 	switch (trigger) {
2168 	case SND_SOC_DPCM_TRIGGER_PRE:
2169 		switch (cmd) {
2170 		case SNDRV_PCM_TRIGGER_START:
2171 		case SNDRV_PCM_TRIGGER_RESUME:
2172 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2173 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2174 			break;
2175 		case SNDRV_PCM_TRIGGER_STOP:
2176 		case SNDRV_PCM_TRIGGER_SUSPEND:
2177 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2178 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2179 			break;
2180 		default:
2181 			ret = -EINVAL;
2182 			break;
2183 		}
2184 		break;
2185 	case SND_SOC_DPCM_TRIGGER_POST:
2186 		switch (cmd) {
2187 		case SNDRV_PCM_TRIGGER_START:
2188 		case SNDRV_PCM_TRIGGER_RESUME:
2189 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2190 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2191 			break;
2192 		case SNDRV_PCM_TRIGGER_STOP:
2193 		case SNDRV_PCM_TRIGGER_SUSPEND:
2194 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2195 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2196 			break;
2197 		default:
2198 			ret = -EINVAL;
2199 			break;
2200 		}
2201 		break;
2202 	case SND_SOC_DPCM_TRIGGER_BESPOKE:
2203 		/* bespoke trigger() - handles both FE and BEs */
2204 
2205 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2206 				fe->dai_link->name, cmd);
2207 
2208 		ret = soc_pcm_bespoke_trigger(substream, cmd);
2209 		break;
2210 	default:
2211 		dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2212 				fe->dai_link->name);
2213 		ret = -EINVAL;
2214 		goto out;
2215 	}
2216 
2217 	if (ret < 0) {
2218 		dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2219 			cmd, ret);
2220 		goto out;
2221 	}
2222 
2223 	switch (cmd) {
2224 	case SNDRV_PCM_TRIGGER_START:
2225 	case SNDRV_PCM_TRIGGER_RESUME:
2226 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2227 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2228 		break;
2229 	case SNDRV_PCM_TRIGGER_STOP:
2230 	case SNDRV_PCM_TRIGGER_SUSPEND:
2231 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2232 		break;
2233 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2234 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2235 		break;
2236 	}
2237 
2238 out:
2239 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2240 	return ret;
2241 }
2242 
dpcm_fe_dai_trigger(struct snd_pcm_substream * substream,int cmd)2243 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2244 {
2245 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2246 	int stream = substream->stream;
2247 
2248 	/* if FE's runtime_update is already set, we're in race;
2249 	 * process this trigger later at exit
2250 	 */
2251 	if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2252 		fe->dpcm[stream].trigger_pending = cmd + 1;
2253 		return 0; /* delayed, assuming it's successful */
2254 	}
2255 
2256 	/* we're alone, let's trigger */
2257 	return dpcm_fe_dai_do_trigger(substream, cmd);
2258 }
2259 
dpcm_be_dai_prepare(struct snd_soc_pcm_runtime * fe,int stream)2260 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2261 {
2262 	struct snd_soc_dpcm *dpcm;
2263 	int ret = 0;
2264 
2265 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2266 
2267 		struct snd_soc_pcm_runtime *be = dpcm->be;
2268 		struct snd_pcm_substream *be_substream =
2269 			snd_soc_dpcm_get_substream(be, stream);
2270 
2271 		/* is this op for this BE ? */
2272 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2273 			continue;
2274 
2275 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2276 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2277 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2278 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2279 			continue;
2280 
2281 		dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2282 			be->dai_link->name);
2283 
2284 		ret = soc_pcm_prepare(be_substream);
2285 		if (ret < 0) {
2286 			dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2287 				ret);
2288 			break;
2289 		}
2290 
2291 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2292 	}
2293 	return ret;
2294 }
2295 
dpcm_fe_dai_prepare(struct snd_pcm_substream * substream)2296 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2297 {
2298 	struct snd_soc_pcm_runtime *fe = substream->private_data;
2299 	int stream = substream->stream, ret = 0;
2300 
2301 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2302 
2303 	dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2304 
2305 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2306 
2307 	/* there is no point preparing this FE if there are no BEs */
2308 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2309 		dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2310 				fe->dai_link->name);
2311 		ret = -EINVAL;
2312 		goto out;
2313 	}
2314 
2315 	ret = dpcm_be_dai_prepare(fe, substream->stream);
2316 	if (ret < 0)
2317 		goto out;
2318 
2319 	/* call prepare on the frontend */
2320 	ret = soc_pcm_prepare(substream);
2321 	if (ret < 0) {
2322 		dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2323 			fe->dai_link->name);
2324 		goto out;
2325 	}
2326 
2327 	/* run the stream event for each BE */
2328 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2329 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2330 
2331 out:
2332 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2333 	mutex_unlock(&fe->card->mutex);
2334 
2335 	return ret;
2336 }
2337 
soc_pcm_ioctl(struct snd_pcm_substream * substream,unsigned int cmd,void * arg)2338 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2339 		     unsigned int cmd, void *arg)
2340 {
2341 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
2342 	struct snd_soc_platform *platform = rtd->platform;
2343 
2344 	if (platform->driver->ops && platform->driver->ops->ioctl)
2345 		return platform->driver->ops->ioctl(substream, cmd, arg);
2346 	return snd_pcm_lib_ioctl(substream, cmd, arg);
2347 }
2348 
dpcm_run_update_shutdown(struct snd_soc_pcm_runtime * fe,int stream)2349 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2350 {
2351 	struct snd_pcm_substream *substream =
2352 		snd_soc_dpcm_get_substream(fe, stream);
2353 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2354 	int err;
2355 
2356 	dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2357 			stream ? "capture" : "playback", fe->dai_link->name);
2358 
2359 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2360 		/* call bespoke trigger - FE takes care of all BE triggers */
2361 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2362 				fe->dai_link->name);
2363 
2364 		err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2365 		if (err < 0)
2366 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2367 	} else {
2368 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2369 			fe->dai_link->name);
2370 
2371 		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2372 		if (err < 0)
2373 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2374 	}
2375 
2376 	err = dpcm_be_dai_hw_free(fe, stream);
2377 	if (err < 0)
2378 		dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2379 
2380 	err = dpcm_be_dai_shutdown(fe, stream);
2381 	if (err < 0)
2382 		dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2383 
2384 	/* run the stream event for each BE */
2385 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2386 
2387 	return 0;
2388 }
2389 
dpcm_run_update_startup(struct snd_soc_pcm_runtime * fe,int stream)2390 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2391 {
2392 	struct snd_pcm_substream *substream =
2393 		snd_soc_dpcm_get_substream(fe, stream);
2394 	struct snd_soc_dpcm *dpcm;
2395 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2396 	int ret;
2397 
2398 	dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2399 			stream ? "capture" : "playback", fe->dai_link->name);
2400 
2401 	/* Only start the BE if the FE is ready */
2402 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2403 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2404 		return -EINVAL;
2405 
2406 	/* startup must always be called for new BEs */
2407 	ret = dpcm_be_dai_startup(fe, stream);
2408 	if (ret < 0)
2409 		goto disconnect;
2410 
2411 	/* keep going if FE state is > open */
2412 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2413 		return 0;
2414 
2415 	ret = dpcm_be_dai_hw_params(fe, stream);
2416 	if (ret < 0)
2417 		goto close;
2418 
2419 	/* keep going if FE state is > hw_params */
2420 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2421 		return 0;
2422 
2423 
2424 	ret = dpcm_be_dai_prepare(fe, stream);
2425 	if (ret < 0)
2426 		goto hw_free;
2427 
2428 	/* run the stream event for each BE */
2429 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2430 
2431 	/* keep going if FE state is > prepare */
2432 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2433 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2434 		return 0;
2435 
2436 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2437 		/* call trigger on the frontend - FE takes care of all BE triggers */
2438 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2439 				fe->dai_link->name);
2440 
2441 		ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2442 		if (ret < 0) {
2443 			dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2444 			goto hw_free;
2445 		}
2446 	} else {
2447 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2448 			fe->dai_link->name);
2449 
2450 		ret = dpcm_be_dai_trigger(fe, stream,
2451 					SNDRV_PCM_TRIGGER_START);
2452 		if (ret < 0) {
2453 			dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2454 			goto hw_free;
2455 		}
2456 	}
2457 
2458 	return 0;
2459 
2460 hw_free:
2461 	dpcm_be_dai_hw_free(fe, stream);
2462 close:
2463 	dpcm_be_dai_shutdown(fe, stream);
2464 disconnect:
2465 	/* disconnect any non started BEs */
2466 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2467 		struct snd_soc_pcm_runtime *be = dpcm->be;
2468 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2469 				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2470 	}
2471 
2472 	return ret;
2473 }
2474 
dpcm_run_new_update(struct snd_soc_pcm_runtime * fe,int stream)2475 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2476 {
2477 	int ret;
2478 
2479 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2480 	ret = dpcm_run_update_startup(fe, stream);
2481 	if (ret < 0)
2482 		dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2483 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2484 
2485 	return ret;
2486 }
2487 
dpcm_run_old_update(struct snd_soc_pcm_runtime * fe,int stream)2488 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2489 {
2490 	int ret;
2491 
2492 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2493 	ret = dpcm_run_update_shutdown(fe, stream);
2494 	if (ret < 0)
2495 		dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2496 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2497 
2498 	return ret;
2499 }
2500 
2501 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2502  * any DAI links.
2503  */
soc_dpcm_runtime_update(struct snd_soc_card * card)2504 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2505 {
2506 	struct snd_soc_pcm_runtime *fe;
2507 	int old, new, paths;
2508 
2509 	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2510 	list_for_each_entry(fe, &card->rtd_list, list) {
2511 		struct snd_soc_dapm_widget_list *list;
2512 
2513 		/* make sure link is FE */
2514 		if (!fe->dai_link->dynamic)
2515 			continue;
2516 
2517 		/* only check active links */
2518 		if (!fe->cpu_dai->active)
2519 			continue;
2520 
2521 		/* DAPM sync will call this to update DSP paths */
2522 		dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2523 			fe->dai_link->name);
2524 
2525 		/* skip if FE doesn't have playback capability */
2526 		if (!fe->cpu_dai->driver->playback.channels_min
2527 		    || !fe->codec_dai->driver->playback.channels_min)
2528 			goto capture;
2529 
2530 		/* skip if FE isn't currently playing */
2531 		if (!fe->cpu_dai->playback_active
2532 		    || !fe->codec_dai->playback_active)
2533 			goto capture;
2534 
2535 		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2536 		if (paths < 0) {
2537 			dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2538 					fe->dai_link->name,  "playback");
2539 			mutex_unlock(&card->mutex);
2540 			return paths;
2541 		}
2542 
2543 		/* update any new playback paths */
2544 		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2545 		if (new) {
2546 			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2547 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2548 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2549 		}
2550 
2551 		/* update any old playback paths */
2552 		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2553 		if (old) {
2554 			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2555 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2556 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2557 		}
2558 
2559 		dpcm_path_put(&list);
2560 capture:
2561 		/* skip if FE doesn't have capture capability */
2562 		if (!fe->cpu_dai->driver->capture.channels_min
2563 		    || !fe->codec_dai->driver->capture.channels_min)
2564 			continue;
2565 
2566 		/* skip if FE isn't currently capturing */
2567 		if (!fe->cpu_dai->capture_active
2568 		    || !fe->codec_dai->capture_active)
2569 			continue;
2570 
2571 		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2572 		if (paths < 0) {
2573 			dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2574 					fe->dai_link->name,  "capture");
2575 			mutex_unlock(&card->mutex);
2576 			return paths;
2577 		}
2578 
2579 		/* update any new capture paths */
2580 		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2581 		if (new) {
2582 			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2583 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2584 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2585 		}
2586 
2587 		/* update any old capture paths */
2588 		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2589 		if (old) {
2590 			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2591 			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2592 			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2593 		}
2594 
2595 		dpcm_path_put(&list);
2596 	}
2597 
2598 	mutex_unlock(&card->mutex);
2599 	return 0;
2600 }
soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime * fe,int mute)2601 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2602 {
2603 	struct snd_soc_dpcm *dpcm;
2604 	struct list_head *clients =
2605 		&fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2606 
2607 	list_for_each_entry(dpcm, clients, list_be) {
2608 
2609 		struct snd_soc_pcm_runtime *be = dpcm->be;
2610 		int i;
2611 
2612 		if (be->dai_link->ignore_suspend)
2613 			continue;
2614 
2615 		for (i = 0; i < be->num_codecs; i++) {
2616 			struct snd_soc_dai *dai = be->codec_dais[i];
2617 			struct snd_soc_dai_driver *drv = dai->driver;
2618 
2619 			dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2620 					 be->dai_link->name);
2621 
2622 			if (drv->ops && drv->ops->digital_mute &&
2623 							dai->playback_active)
2624 				drv->ops->digital_mute(dai, mute);
2625 		}
2626 	}
2627 
2628 	return 0;
2629 }
2630 
dpcm_fe_dai_open(struct snd_pcm_substream * fe_substream)2631 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2632 {
2633 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2634 	struct snd_soc_dpcm *dpcm;
2635 	struct snd_soc_dapm_widget_list *list;
2636 	int ret;
2637 	int stream = fe_substream->stream;
2638 
2639 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2640 	fe->dpcm[stream].runtime = fe_substream->runtime;
2641 
2642 	ret = dpcm_path_get(fe, stream, &list);
2643 	if (ret < 0) {
2644 		mutex_unlock(&fe->card->mutex);
2645 		return ret;
2646 	} else if (ret == 0) {
2647 		dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2648 			fe->dai_link->name, stream ? "capture" : "playback");
2649 	}
2650 
2651 	/* calculate valid and active FE <-> BE dpcms */
2652 	dpcm_process_paths(fe, stream, &list, 1);
2653 
2654 	ret = dpcm_fe_dai_startup(fe_substream);
2655 	if (ret < 0) {
2656 		/* clean up all links */
2657 		list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2658 			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2659 
2660 		dpcm_be_disconnect(fe, stream);
2661 		fe->dpcm[stream].runtime = NULL;
2662 	}
2663 
2664 	dpcm_clear_pending_state(fe, stream);
2665 	dpcm_path_put(&list);
2666 	mutex_unlock(&fe->card->mutex);
2667 	return ret;
2668 }
2669 
dpcm_fe_dai_close(struct snd_pcm_substream * fe_substream)2670 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2671 {
2672 	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2673 	struct snd_soc_dpcm *dpcm;
2674 	int stream = fe_substream->stream, ret;
2675 
2676 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2677 	ret = dpcm_fe_dai_shutdown(fe_substream);
2678 
2679 	/* mark FE's links ready to prune */
2680 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2681 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2682 
2683 	dpcm_be_disconnect(fe, stream);
2684 
2685 	fe->dpcm[stream].runtime = NULL;
2686 	mutex_unlock(&fe->card->mutex);
2687 	return ret;
2688 }
2689 
2690 /* create a new pcm */
soc_new_pcm(struct snd_soc_pcm_runtime * rtd,int num)2691 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2692 {
2693 	struct snd_soc_platform *platform = rtd->platform;
2694 	struct snd_soc_dai *codec_dai;
2695 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2696 	struct snd_pcm *pcm;
2697 	char new_name[64];
2698 	int ret = 0, playback = 0, capture = 0;
2699 	int i;
2700 
2701 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2702 		playback = rtd->dai_link->dpcm_playback;
2703 		capture = rtd->dai_link->dpcm_capture;
2704 	} else {
2705 		for (i = 0; i < rtd->num_codecs; i++) {
2706 			codec_dai = rtd->codec_dais[i];
2707 			if (codec_dai->driver->playback.channels_min)
2708 				playback = 1;
2709 			if (codec_dai->driver->capture.channels_min)
2710 				capture = 1;
2711 		}
2712 
2713 		capture = capture && cpu_dai->driver->capture.channels_min;
2714 		playback = playback && cpu_dai->driver->playback.channels_min;
2715 	}
2716 
2717 	if (rtd->dai_link->playback_only) {
2718 		playback = 1;
2719 		capture = 0;
2720 	}
2721 
2722 	if (rtd->dai_link->capture_only) {
2723 		playback = 0;
2724 		capture = 1;
2725 	}
2726 
2727 	/* create the PCM */
2728 	if (rtd->dai_link->no_pcm) {
2729 		snprintf(new_name, sizeof(new_name), "(%s)",
2730 			rtd->dai_link->stream_name);
2731 
2732 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2733 				playback, capture, &pcm);
2734 	} else {
2735 		if (rtd->dai_link->dynamic)
2736 			snprintf(new_name, sizeof(new_name), "%s (*)",
2737 				rtd->dai_link->stream_name);
2738 		else
2739 			snprintf(new_name, sizeof(new_name), "%s %s-%d",
2740 				rtd->dai_link->stream_name,
2741 				(rtd->num_codecs > 1) ?
2742 				"multicodec" : rtd->codec_dai->name, num);
2743 
2744 		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2745 			capture, &pcm);
2746 	}
2747 	if (ret < 0) {
2748 		dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2749 			rtd->dai_link->name);
2750 		return ret;
2751 	}
2752 	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2753 
2754 	/* DAPM dai link stream work */
2755 	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2756 
2757 	pcm->nonatomic = rtd->dai_link->nonatomic;
2758 	rtd->pcm = pcm;
2759 	pcm->private_data = rtd;
2760 
2761 	if (rtd->dai_link->no_pcm) {
2762 		if (playback)
2763 			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2764 		if (capture)
2765 			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2766 		goto out;
2767 	}
2768 
2769 	/* ASoC PCM operations */
2770 	if (rtd->dai_link->dynamic) {
2771 		rtd->ops.open		= dpcm_fe_dai_open;
2772 		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
2773 		rtd->ops.prepare	= dpcm_fe_dai_prepare;
2774 		rtd->ops.trigger	= dpcm_fe_dai_trigger;
2775 		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
2776 		rtd->ops.close		= dpcm_fe_dai_close;
2777 		rtd->ops.pointer	= soc_pcm_pointer;
2778 		rtd->ops.ioctl		= soc_pcm_ioctl;
2779 	} else {
2780 		rtd->ops.open		= soc_pcm_open;
2781 		rtd->ops.hw_params	= soc_pcm_hw_params;
2782 		rtd->ops.prepare	= soc_pcm_prepare;
2783 		rtd->ops.trigger	= soc_pcm_trigger;
2784 		rtd->ops.hw_free	= soc_pcm_hw_free;
2785 		rtd->ops.close		= soc_pcm_close;
2786 		rtd->ops.pointer	= soc_pcm_pointer;
2787 		rtd->ops.ioctl		= soc_pcm_ioctl;
2788 	}
2789 
2790 	if (platform->driver->ops) {
2791 		rtd->ops.ack		= platform->driver->ops->ack;
2792 		rtd->ops.copy_user	= platform->driver->ops->copy_user;
2793 		rtd->ops.copy_kernel	= platform->driver->ops->copy_kernel;
2794 		rtd->ops.fill_silence	= platform->driver->ops->fill_silence;
2795 		rtd->ops.page		= platform->driver->ops->page;
2796 		rtd->ops.mmap		= platform->driver->ops->mmap;
2797 	}
2798 
2799 	if (playback)
2800 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2801 
2802 	if (capture)
2803 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2804 
2805 	if (platform->driver->pcm_new) {
2806 		ret = platform->driver->pcm_new(rtd);
2807 		if (ret < 0) {
2808 			dev_err(platform->dev,
2809 				"ASoC: pcm constructor failed: %d\n",
2810 				ret);
2811 			return ret;
2812 		}
2813 	}
2814 
2815 	pcm->private_free = platform->driver->pcm_free;
2816 out:
2817 	dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2818 		 (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2819 		 cpu_dai->name);
2820 	return ret;
2821 }
2822 
2823 /* is the current PCM operation for this FE ? */
snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime * fe,int stream)2824 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2825 {
2826 	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2827 		return 1;
2828 	return 0;
2829 }
2830 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2831 
2832 /* is the current PCM operation for this BE ? */
snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)2833 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2834 		struct snd_soc_pcm_runtime *be, int stream)
2835 {
2836 	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2837 	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2838 		  be->dpcm[stream].runtime_update))
2839 		return 1;
2840 	return 0;
2841 }
2842 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2843 
2844 /* get the substream for this BE */
2845 struct snd_pcm_substream *
snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime * be,int stream)2846 	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2847 {
2848 	return be->pcm->streams[stream].substream;
2849 }
2850 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2851 
2852 /* get the BE runtime state */
2853 enum snd_soc_dpcm_state
snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime * be,int stream)2854 	snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2855 {
2856 	return be->dpcm[stream].state;
2857 }
2858 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2859 
2860 /* set the BE runtime state */
snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime * be,int stream,enum snd_soc_dpcm_state state)2861 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2862 		int stream, enum snd_soc_dpcm_state state)
2863 {
2864 	be->dpcm[stream].state = state;
2865 }
2866 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2867 
2868 /*
2869  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2870  * are not running, paused or suspended for the specified stream direction.
2871  */
snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)2872 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2873 		struct snd_soc_pcm_runtime *be, int stream)
2874 {
2875 	struct snd_soc_dpcm *dpcm;
2876 	int state;
2877 
2878 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2879 
2880 		if (dpcm->fe == fe)
2881 			continue;
2882 
2883 		state = dpcm->fe->dpcm[stream].state;
2884 		if (state == SND_SOC_DPCM_STATE_START ||
2885 			state == SND_SOC_DPCM_STATE_PAUSED ||
2886 			state == SND_SOC_DPCM_STATE_SUSPEND)
2887 			return 0;
2888 	}
2889 
2890 	/* it's safe to free/stop this BE DAI */
2891 	return 1;
2892 }
2893 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2894 
2895 /*
2896  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2897  * running, paused or suspended for the specified stream direction.
2898  */
snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)2899 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2900 		struct snd_soc_pcm_runtime *be, int stream)
2901 {
2902 	struct snd_soc_dpcm *dpcm;
2903 	int state;
2904 
2905 	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2906 
2907 		if (dpcm->fe == fe)
2908 			continue;
2909 
2910 		state = dpcm->fe->dpcm[stream].state;
2911 		if (state == SND_SOC_DPCM_STATE_START ||
2912 			state == SND_SOC_DPCM_STATE_PAUSED ||
2913 			state == SND_SOC_DPCM_STATE_SUSPEND ||
2914 			state == SND_SOC_DPCM_STATE_PREPARE)
2915 			return 0;
2916 	}
2917 
2918 	/* it's safe to change hw_params */
2919 	return 1;
2920 }
2921 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2922 
2923 #ifdef CONFIG_DEBUG_FS
dpcm_state_string(enum snd_soc_dpcm_state state)2924 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
2925 {
2926 	switch (state) {
2927 	case SND_SOC_DPCM_STATE_NEW:
2928 		return "new";
2929 	case SND_SOC_DPCM_STATE_OPEN:
2930 		return "open";
2931 	case SND_SOC_DPCM_STATE_HW_PARAMS:
2932 		return "hw_params";
2933 	case SND_SOC_DPCM_STATE_PREPARE:
2934 		return "prepare";
2935 	case SND_SOC_DPCM_STATE_START:
2936 		return "start";
2937 	case SND_SOC_DPCM_STATE_STOP:
2938 		return "stop";
2939 	case SND_SOC_DPCM_STATE_SUSPEND:
2940 		return "suspend";
2941 	case SND_SOC_DPCM_STATE_PAUSED:
2942 		return "paused";
2943 	case SND_SOC_DPCM_STATE_HW_FREE:
2944 		return "hw_free";
2945 	case SND_SOC_DPCM_STATE_CLOSE:
2946 		return "close";
2947 	}
2948 
2949 	return "unknown";
2950 }
2951 
dpcm_show_state(struct snd_soc_pcm_runtime * fe,int stream,char * buf,size_t size)2952 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2953 				int stream, char *buf, size_t size)
2954 {
2955 	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2956 	struct snd_soc_dpcm *dpcm;
2957 	ssize_t offset = 0;
2958 
2959 	/* FE state */
2960 	offset += scnprintf(buf + offset, size - offset,
2961 			"[%s - %s]\n", fe->dai_link->name,
2962 			stream ? "Capture" : "Playback");
2963 
2964 	offset += scnprintf(buf + offset, size - offset, "State: %s\n",
2965 	                dpcm_state_string(fe->dpcm[stream].state));
2966 
2967 	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2968 	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2969 		offset += scnprintf(buf + offset, size - offset,
2970 				"Hardware Params: "
2971 				"Format = %s, Channels = %d, Rate = %d\n",
2972 				snd_pcm_format_name(params_format(params)),
2973 				params_channels(params),
2974 				params_rate(params));
2975 
2976 	/* BEs state */
2977 	offset += scnprintf(buf + offset, size - offset, "Backends:\n");
2978 
2979 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2980 		offset += scnprintf(buf + offset, size - offset,
2981 				" No active DSP links\n");
2982 		goto out;
2983 	}
2984 
2985 	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2986 		struct snd_soc_pcm_runtime *be = dpcm->be;
2987 		params = &dpcm->hw_params;
2988 
2989 		offset += scnprintf(buf + offset, size - offset,
2990 				"- %s\n", be->dai_link->name);
2991 
2992 		offset += scnprintf(buf + offset, size - offset,
2993 				"   State: %s\n",
2994 				dpcm_state_string(be->dpcm[stream].state));
2995 
2996 		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2997 		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2998 			offset += scnprintf(buf + offset, size - offset,
2999 				"   Hardware Params: "
3000 				"Format = %s, Channels = %d, Rate = %d\n",
3001 				snd_pcm_format_name(params_format(params)),
3002 				params_channels(params),
3003 				params_rate(params));
3004 	}
3005 
3006 out:
3007 	return offset;
3008 }
3009 
dpcm_state_read_file(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3010 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
3011 				size_t count, loff_t *ppos)
3012 {
3013 	struct snd_soc_pcm_runtime *fe = file->private_data;
3014 	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
3015 	char *buf;
3016 
3017 	buf = kmalloc(out_count, GFP_KERNEL);
3018 	if (!buf)
3019 		return -ENOMEM;
3020 
3021 	if (fe->cpu_dai->driver->playback.channels_min)
3022 		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
3023 					buf + offset, out_count - offset);
3024 
3025 	if (fe->cpu_dai->driver->capture.channels_min)
3026 		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
3027 					buf + offset, out_count - offset);
3028 
3029 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
3030 
3031 	kfree(buf);
3032 	return ret;
3033 }
3034 
3035 static const struct file_operations dpcm_state_fops = {
3036 	.open = simple_open,
3037 	.read = dpcm_state_read_file,
3038 	.llseek = default_llseek,
3039 };
3040 
soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime * rtd)3041 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
3042 {
3043 	if (!rtd->dai_link)
3044 		return;
3045 
3046 	if (!rtd->card->debugfs_card_root)
3047 		return;
3048 
3049 	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
3050 			rtd->card->debugfs_card_root);
3051 	if (!rtd->debugfs_dpcm_root) {
3052 		dev_dbg(rtd->dev,
3053 			 "ASoC: Failed to create dpcm debugfs directory %s\n",
3054 			 rtd->dai_link->name);
3055 		return;
3056 	}
3057 
3058 	debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
3059 			    rtd, &dpcm_state_fops);
3060 }
3061 #endif
3062