1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // soc-pcm.c  --  ALSA SoC PCM
4 //
5 // Copyright 2005 Wolfson Microelectronics PLC.
6 // Copyright 2005 Openedhand Ltd.
7 // Copyright (C) 2010 Slimlogic Ltd.
8 // Copyright (C) 2010 Texas Instruments Inc.
9 //
10 // Authors: Liam Girdwood <lrg@ti.com>
11 //          Mark Brown <broonie@opensource.wolfsonmicro.com>
12 
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/delay.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/slab.h>
19 #include <linux/workqueue.h>
20 #include <linux/export.h>
21 #include <linux/debugfs.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/soc-dpcm.h>
27 #include <sound/soc-link.h>
28 #include <sound/initval.h>
29 
30 #define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret)
_soc_pcm_ret(struct snd_soc_pcm_runtime * rtd,const char * func,int ret)31 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
32 			       const char *func, int ret)
33 {
34 	/* Positive, Zero values are not errors */
35 	if (ret >= 0)
36 		return ret;
37 
38 	/* Negative values might be errors */
39 	switch (ret) {
40 	case -EPROBE_DEFER:
41 	case -ENOTSUPP:
42 		break;
43 	default:
44 		dev_err(rtd->dev,
45 			"ASoC: error at %s on %s: %d\n",
46 			func, rtd->dai_link->name, ret);
47 	}
48 
49 	return ret;
50 }
51 
snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime * rtd)52 static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
53 {
54 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
55 }
56 
snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime * rtd)57 static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
58 {
59 	mutex_unlock(&rtd->card->pcm_mutex);
60 }
61 
62 #define snd_soc_dpcm_mutex_assert_held(rtd) \
63 	lockdep_assert_held(&(rtd)->card->pcm_mutex)
64 
snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime * rtd,int stream)65 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
66 						int stream)
67 {
68 	snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
69 }
70 
71 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
72 	snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
73 
snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime * rtd,int stream)74 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
75 						  int stream)
76 {
77 	snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
78 }
79 
80 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
81 	snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
82 
83 #define DPCM_MAX_BE_USERS	8
84 
soc_cpu_dai_name(struct snd_soc_pcm_runtime * rtd)85 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
86 {
87 	return (rtd)->dai_link->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
88 }
soc_codec_dai_name(struct snd_soc_pcm_runtime * rtd)89 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
90 {
91 	return (rtd)->dai_link->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
92 }
93 
94 #ifdef CONFIG_DEBUG_FS
dpcm_state_string(enum snd_soc_dpcm_state state)95 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
96 {
97 	switch (state) {
98 	case SND_SOC_DPCM_STATE_NEW:
99 		return "new";
100 	case SND_SOC_DPCM_STATE_OPEN:
101 		return "open";
102 	case SND_SOC_DPCM_STATE_HW_PARAMS:
103 		return "hw_params";
104 	case SND_SOC_DPCM_STATE_PREPARE:
105 		return "prepare";
106 	case SND_SOC_DPCM_STATE_START:
107 		return "start";
108 	case SND_SOC_DPCM_STATE_STOP:
109 		return "stop";
110 	case SND_SOC_DPCM_STATE_SUSPEND:
111 		return "suspend";
112 	case SND_SOC_DPCM_STATE_PAUSED:
113 		return "paused";
114 	case SND_SOC_DPCM_STATE_HW_FREE:
115 		return "hw_free";
116 	case SND_SOC_DPCM_STATE_CLOSE:
117 		return "close";
118 	}
119 
120 	return "unknown";
121 }
122 
dpcm_show_state(struct snd_soc_pcm_runtime * fe,int stream,char * buf,size_t size)123 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
124 			       int stream, char *buf, size_t size)
125 {
126 	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
127 	struct snd_soc_dpcm *dpcm;
128 	ssize_t offset = 0;
129 
130 	/* FE state */
131 	offset += scnprintf(buf + offset, size - offset,
132 			   "[%s - %s]\n", fe->dai_link->name,
133 			   stream ? "Capture" : "Playback");
134 
135 	offset += scnprintf(buf + offset, size - offset, "State: %s\n",
136 			   dpcm_state_string(fe->dpcm[stream].state));
137 
138 	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
139 	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
140 		offset += scnprintf(buf + offset, size - offset,
141 				   "Hardware Params: "
142 				   "Format = %s, Channels = %d, Rate = %d\n",
143 				   snd_pcm_format_name(params_format(params)),
144 				   params_channels(params),
145 				   params_rate(params));
146 
147 	/* BEs state */
148 	offset += scnprintf(buf + offset, size - offset, "Backends:\n");
149 
150 	if (list_empty(&fe->dpcm[stream].be_clients)) {
151 		offset += scnprintf(buf + offset, size - offset,
152 				   " No active DSP links\n");
153 		goto out;
154 	}
155 
156 	for_each_dpcm_be(fe, stream, dpcm) {
157 		struct snd_soc_pcm_runtime *be = dpcm->be;
158 		params = &dpcm->hw_params;
159 
160 		offset += scnprintf(buf + offset, size - offset,
161 				   "- %s\n", be->dai_link->name);
162 
163 		offset += scnprintf(buf + offset, size - offset,
164 				   "   State: %s\n",
165 				   dpcm_state_string(be->dpcm[stream].state));
166 
167 		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
168 		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
169 			offset += scnprintf(buf + offset, size - offset,
170 					   "   Hardware Params: "
171 					   "Format = %s, Channels = %d, Rate = %d\n",
172 					   snd_pcm_format_name(params_format(params)),
173 					   params_channels(params),
174 					   params_rate(params));
175 	}
176 out:
177 	return offset;
178 }
179 
dpcm_state_read_file(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)180 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
181 				    size_t count, loff_t *ppos)
182 {
183 	struct snd_soc_pcm_runtime *fe = file->private_data;
184 	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
185 	int stream;
186 	char *buf;
187 
188 	if (fe->dai_link->num_cpus > 1) {
189 		dev_err(fe->dev,
190 			"%s doesn't support Multi CPU yet\n", __func__);
191 		return -EINVAL;
192 	}
193 
194 	buf = kmalloc(out_count, GFP_KERNEL);
195 	if (!buf)
196 		return -ENOMEM;
197 
198 	snd_soc_dpcm_mutex_lock(fe);
199 	for_each_pcm_streams(stream)
200 		if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
201 			offset += dpcm_show_state(fe, stream,
202 						  buf + offset,
203 						  out_count - offset);
204 	snd_soc_dpcm_mutex_unlock(fe);
205 
206 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
207 
208 	kfree(buf);
209 	return ret;
210 }
211 
212 static const struct file_operations dpcm_state_fops = {
213 	.open = simple_open,
214 	.read = dpcm_state_read_file,
215 	.llseek = default_llseek,
216 };
217 
soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime * rtd)218 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
219 {
220 	if (!rtd->dai_link->dynamic)
221 		return;
222 
223 	if (!rtd->card->debugfs_card_root)
224 		return;
225 
226 	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
227 						    rtd->card->debugfs_card_root);
228 
229 	debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
230 			    rtd, &dpcm_state_fops);
231 }
232 
dpcm_create_debugfs_state(struct snd_soc_dpcm * dpcm,int stream)233 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
234 {
235 	char *name;
236 
237 	name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
238 			 stream ? "capture" : "playback");
239 	if (name) {
240 		dpcm->debugfs_state = debugfs_create_dir(
241 			name, dpcm->fe->debugfs_dpcm_root);
242 		debugfs_create_u32("state", 0644, dpcm->debugfs_state,
243 				   &dpcm->state);
244 		kfree(name);
245 	}
246 }
247 
dpcm_remove_debugfs_state(struct snd_soc_dpcm * dpcm)248 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
249 {
250 	debugfs_remove_recursive(dpcm->debugfs_state);
251 }
252 
253 #else
dpcm_create_debugfs_state(struct snd_soc_dpcm * dpcm,int stream)254 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
255 					     int stream)
256 {
257 }
258 
dpcm_remove_debugfs_state(struct snd_soc_dpcm * dpcm)259 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
260 {
261 }
262 #endif
263 
264 /* Set FE's runtime_update state; the state is protected via PCM stream lock
265  * for avoiding the race with trigger callback.
266  * If the state is unset and a trigger is pending while the previous operation,
267  * process the pending trigger action here.
268  */
269 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
dpcm_set_fe_update_state(struct snd_soc_pcm_runtime * fe,int stream,enum snd_soc_dpcm_update state)270 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
271 				     int stream, enum snd_soc_dpcm_update state)
272 {
273 	struct snd_pcm_substream *substream =
274 		snd_soc_dpcm_get_substream(fe, stream);
275 
276 	snd_soc_dpcm_stream_lock_irq(fe, stream);
277 	if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
278 		dpcm_fe_dai_do_trigger(substream,
279 				       fe->dpcm[stream].trigger_pending - 1);
280 		fe->dpcm[stream].trigger_pending = 0;
281 	}
282 	fe->dpcm[stream].runtime_update = state;
283 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
284 }
285 
dpcm_set_be_update_state(struct snd_soc_pcm_runtime * be,int stream,enum snd_soc_dpcm_update state)286 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
287 				     int stream, enum snd_soc_dpcm_update state)
288 {
289 	be->dpcm[stream].runtime_update = state;
290 }
291 
292 /**
293  * snd_soc_runtime_action() - Increment/Decrement active count for
294  * PCM runtime components
295  * @rtd: ASoC PCM runtime that is activated
296  * @stream: Direction of the PCM stream
297  * @action: Activate stream if 1. Deactivate if -1.
298  *
299  * Increments/Decrements the active count for all the DAIs and components
300  * attached to a PCM runtime.
301  * Should typically be called when a stream is opened.
302  *
303  * Must be called with the rtd->card->pcm_mutex being held
304  */
snd_soc_runtime_action(struct snd_soc_pcm_runtime * rtd,int stream,int action)305 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
306 			    int stream, int action)
307 {
308 	struct snd_soc_dai *dai;
309 	int i;
310 
311 	snd_soc_dpcm_mutex_assert_held(rtd);
312 
313 	for_each_rtd_dais(rtd, i, dai)
314 		snd_soc_dai_action(dai, stream, action);
315 }
316 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
317 
318 /**
319  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
320  * @rtd: The ASoC PCM runtime that should be checked.
321  *
322  * This function checks whether the power down delay should be ignored for a
323  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
324  * been configured to ignore the delay, or if none of the components benefits
325  * from having the delay.
326  */
snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime * rtd)327 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
328 {
329 	struct snd_soc_component *component;
330 	bool ignore = true;
331 	int i;
332 
333 	if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
334 		return true;
335 
336 	for_each_rtd_components(rtd, i, component)
337 		ignore &= !component->driver->use_pmdown_time;
338 
339 	return ignore;
340 }
341 
342 /**
343  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
344  * @substream: the pcm substream
345  * @hw: the hardware parameters
346  *
347  * Sets the substream runtime hardware parameters.
348  */
snd_soc_set_runtime_hwparams(struct snd_pcm_substream * substream,const struct snd_pcm_hardware * hw)349 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
350 	const struct snd_pcm_hardware *hw)
351 {
352 	substream->runtime->hw = *hw;
353 
354 	return 0;
355 }
356 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
357 
358 /* 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)359 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
360 	int event)
361 {
362 	struct snd_soc_dpcm *dpcm;
363 
364 	snd_soc_dpcm_mutex_assert_held(fe);
365 
366 	for_each_dpcm_be(fe, dir, dpcm) {
367 
368 		struct snd_soc_pcm_runtime *be = dpcm->be;
369 
370 		dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
371 				be->dai_link->name, event, dir);
372 
373 		if ((event == SND_SOC_DAPM_STREAM_STOP) &&
374 		    (be->dpcm[dir].users >= 1))
375 			continue;
376 
377 		snd_soc_dapm_stream_event(be, dir, event);
378 	}
379 
380 	snd_soc_dapm_stream_event(fe, dir, event);
381 
382 	return 0;
383 }
384 
soc_pcm_set_dai_params(struct snd_soc_dai * dai,struct snd_pcm_hw_params * params)385 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
386 				   struct snd_pcm_hw_params *params)
387 {
388 	if (params) {
389 		dai->rate	 = params_rate(params);
390 		dai->channels	 = params_channels(params);
391 		dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
392 	} else {
393 		dai->rate	 = 0;
394 		dai->channels	 = 0;
395 		dai->sample_bits = 0;
396 	}
397 }
398 
soc_pcm_apply_symmetry(struct snd_pcm_substream * substream,struct snd_soc_dai * soc_dai)399 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
400 					struct snd_soc_dai *soc_dai)
401 {
402 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
403 	int ret;
404 
405 	if (!snd_soc_dai_active(soc_dai))
406 		return 0;
407 
408 #define __soc_pcm_apply_symmetry(name, NAME)				\
409 	if (soc_dai->name && (soc_dai->driver->symmetric_##name ||	\
410 			      rtd->dai_link->symmetric_##name)) {	\
411 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
412 			#name, soc_dai->name);				\
413 									\
414 		ret = snd_pcm_hw_constraint_single(substream->runtime,	\
415 						   SNDRV_PCM_HW_PARAM_##NAME,\
416 						   soc_dai->name);	\
417 		if (ret < 0) {						\
418 			dev_err(soc_dai->dev,				\
419 				"ASoC: Unable to apply %s constraint: %d\n",\
420 				#name, ret);				\
421 			return ret;					\
422 		}							\
423 	}
424 
425 	__soc_pcm_apply_symmetry(rate,		RATE);
426 	__soc_pcm_apply_symmetry(channels,	CHANNELS);
427 	__soc_pcm_apply_symmetry(sample_bits,	SAMPLE_BITS);
428 
429 	return 0;
430 }
431 
soc_pcm_params_symmetry(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)432 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
433 				struct snd_pcm_hw_params *params)
434 {
435 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
436 	struct snd_soc_dai d;
437 	struct snd_soc_dai *dai;
438 	struct snd_soc_dai *cpu_dai;
439 	unsigned int symmetry, i;
440 
441 	d.name = __func__;
442 	soc_pcm_set_dai_params(&d, params);
443 
444 #define __soc_pcm_params_symmetry(xxx)					\
445 	symmetry = rtd->dai_link->symmetric_##xxx;			\
446 	for_each_rtd_dais(rtd, i, dai)					\
447 		symmetry |= dai->driver->symmetric_##xxx;		\
448 									\
449 	if (symmetry)							\
450 		for_each_rtd_cpu_dais(rtd, i, cpu_dai)			\
451 			if (!snd_soc_dai_is_dummy(cpu_dai) &&		\
452 			    cpu_dai->xxx && cpu_dai->xxx != d.xxx) {	\
453 				dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
454 					#xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
455 				return -EINVAL;				\
456 			}
457 
458 	/* reject unmatched parameters when applying symmetry */
459 	__soc_pcm_params_symmetry(rate);
460 	__soc_pcm_params_symmetry(channels);
461 	__soc_pcm_params_symmetry(sample_bits);
462 
463 	return 0;
464 }
465 
soc_pcm_update_symmetry(struct snd_pcm_substream * substream)466 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
467 {
468 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
469 	struct snd_soc_dai_link *link = rtd->dai_link;
470 	struct snd_soc_dai *dai;
471 	unsigned int symmetry, i;
472 
473 	symmetry = link->symmetric_rate ||
474 		link->symmetric_channels ||
475 		link->symmetric_sample_bits;
476 
477 	for_each_rtd_dais(rtd, i, dai)
478 		symmetry = symmetry ||
479 			dai->driver->symmetric_rate ||
480 			dai->driver->symmetric_channels ||
481 			dai->driver->symmetric_sample_bits;
482 
483 	if (symmetry)
484 		substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
485 }
486 
soc_pcm_set_msb(struct snd_pcm_substream * substream,int bits)487 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
488 {
489 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
490 	int ret;
491 
492 	if (!bits)
493 		return;
494 
495 	ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
496 	if (ret != 0)
497 		dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
498 				 bits, ret);
499 }
500 
soc_pcm_apply_msb(struct snd_pcm_substream * substream)501 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
502 {
503 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
504 	struct snd_soc_dai *cpu_dai;
505 	struct snd_soc_dai *codec_dai;
506 	int stream = substream->stream;
507 	int i;
508 	unsigned int bits = 0, cpu_bits = 0;
509 
510 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
511 		struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
512 
513 		if (pcm_codec->sig_bits == 0) {
514 			bits = 0;
515 			break;
516 		}
517 		bits = max(pcm_codec->sig_bits, bits);
518 	}
519 
520 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
521 		struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
522 
523 		if (pcm_cpu->sig_bits == 0) {
524 			cpu_bits = 0;
525 			break;
526 		}
527 		cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
528 	}
529 
530 	soc_pcm_set_msb(substream, bits);
531 	soc_pcm_set_msb(substream, cpu_bits);
532 }
533 
soc_pcm_hw_init(struct snd_pcm_hardware * hw)534 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
535 {
536 	hw->rates		= UINT_MAX;
537 	hw->rate_min		= 0;
538 	hw->rate_max		= UINT_MAX;
539 	hw->channels_min	= 0;
540 	hw->channels_max	= UINT_MAX;
541 	hw->formats		= ULLONG_MAX;
542 }
543 
soc_pcm_hw_update_rate(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)544 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
545 				   struct snd_soc_pcm_stream *p)
546 {
547 	hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
548 
549 	/* setup hw->rate_min/max via hw->rates first */
550 	snd_pcm_hw_limit_rates(hw);
551 
552 	/* update hw->rate_min/max by snd_soc_pcm_stream */
553 	hw->rate_min = max(hw->rate_min, p->rate_min);
554 	hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
555 }
556 
soc_pcm_hw_update_chan(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)557 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
558 				   struct snd_soc_pcm_stream *p)
559 {
560 	hw->channels_min = max(hw->channels_min, p->channels_min);
561 	hw->channels_max = min(hw->channels_max, p->channels_max);
562 }
563 
soc_pcm_hw_update_format(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)564 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
565 				     struct snd_soc_pcm_stream *p)
566 {
567 	hw->formats &= p->formats;
568 }
569 
570 /**
571  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
572  * @rtd: ASoC PCM runtime
573  * @hw: PCM hardware parameters (output)
574  * @stream: Direction of the PCM stream
575  *
576  * Calculates the subset of stream parameters supported by all DAIs
577  * associated with the PCM stream.
578  */
snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_hardware * hw,int stream)579 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
580 			    struct snd_pcm_hardware *hw, int stream)
581 {
582 	struct snd_soc_dai *codec_dai;
583 	struct snd_soc_dai *cpu_dai;
584 	struct snd_soc_pcm_stream *codec_stream;
585 	struct snd_soc_pcm_stream *cpu_stream;
586 	unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
587 	int i;
588 
589 	soc_pcm_hw_init(hw);
590 
591 	/* first calculate min/max only for CPUs in the DAI link */
592 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
593 
594 		/*
595 		 * Skip CPUs which don't support the current stream type.
596 		 * Otherwise, since the rate, channel, and format values will
597 		 * zero in that case, we would have no usable settings left,
598 		 * causing the resulting setup to fail.
599 		 */
600 		if (!snd_soc_dai_stream_valid(cpu_dai, stream))
601 			continue;
602 
603 		cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
604 
605 		soc_pcm_hw_update_chan(hw, cpu_stream);
606 		soc_pcm_hw_update_rate(hw, cpu_stream);
607 		soc_pcm_hw_update_format(hw, cpu_stream);
608 	}
609 	cpu_chan_min = hw->channels_min;
610 	cpu_chan_max = hw->channels_max;
611 
612 	/* second calculate min/max only for CODECs in the DAI link */
613 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
614 
615 		/*
616 		 * Skip CODECs which don't support the current stream type.
617 		 * Otherwise, since the rate, channel, and format values will
618 		 * zero in that case, we would have no usable settings left,
619 		 * causing the resulting setup to fail.
620 		 */
621 		if (!snd_soc_dai_stream_valid(codec_dai, stream))
622 			continue;
623 
624 		codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
625 
626 		soc_pcm_hw_update_chan(hw, codec_stream);
627 		soc_pcm_hw_update_rate(hw, codec_stream);
628 		soc_pcm_hw_update_format(hw, codec_stream);
629 	}
630 
631 	/* Verify both a valid CPU DAI and a valid CODEC DAI were found */
632 	if (!hw->channels_min)
633 		return -EINVAL;
634 
635 	/*
636 	 * chan min/max cannot be enforced if there are multiple CODEC DAIs
637 	 * connected to CPU DAI(s), use CPU DAI's directly and let
638 	 * channel allocation be fixed up later
639 	 */
640 	if (rtd->dai_link->num_codecs > 1) {
641 		hw->channels_min = cpu_chan_min;
642 		hw->channels_max = cpu_chan_max;
643 	}
644 
645 	return 0;
646 }
647 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
648 
soc_pcm_init_runtime_hw(struct snd_pcm_substream * substream)649 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
650 {
651 	struct snd_pcm_hardware *hw = &substream->runtime->hw;
652 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
653 	u64 formats = hw->formats;
654 
655 	/*
656 	 * At least one CPU and one CODEC should match. Otherwise, we should
657 	 * have bailed out on a higher level, since there would be no CPU or
658 	 * CODEC to support the transfer direction in that case.
659 	 */
660 	snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
661 
662 	if (formats)
663 		hw->formats &= formats;
664 }
665 
soc_pcm_components_open(struct snd_pcm_substream * substream)666 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
667 {
668 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
669 	struct snd_soc_component *component;
670 	int i, ret = 0;
671 
672 	for_each_rtd_components(rtd, i, component) {
673 		ret = snd_soc_component_module_get_when_open(component, substream);
674 		if (ret < 0)
675 			break;
676 
677 		ret = snd_soc_component_open(component, substream);
678 		if (ret < 0)
679 			break;
680 	}
681 
682 	return ret;
683 }
684 
soc_pcm_components_close(struct snd_pcm_substream * substream,int rollback)685 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
686 				    int rollback)
687 {
688 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
689 	struct snd_soc_component *component;
690 	int i, ret = 0;
691 
692 	for_each_rtd_components(rtd, i, component) {
693 		int r = snd_soc_component_close(component, substream, rollback);
694 		if (r < 0)
695 			ret = r; /* use last ret */
696 
697 		snd_soc_component_module_put_when_close(component, substream, rollback);
698 	}
699 
700 	return ret;
701 }
702 
soc_pcm_clean(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,int rollback)703 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
704 			 struct snd_pcm_substream *substream, int rollback)
705 {
706 	struct snd_soc_component *component;
707 	struct snd_soc_dai *dai;
708 	int i;
709 
710 	snd_soc_dpcm_mutex_assert_held(rtd);
711 
712 	if (!rollback)
713 		snd_soc_runtime_deactivate(rtd, substream->stream);
714 
715 	for_each_rtd_dais(rtd, i, dai)
716 		snd_soc_dai_shutdown(dai, substream, rollback);
717 
718 	snd_soc_link_shutdown(substream, rollback);
719 
720 	soc_pcm_components_close(substream, rollback);
721 
722 	snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
723 
724 	for_each_rtd_components(rtd, i, component)
725 		if (!snd_soc_component_active(component))
726 			pinctrl_pm_select_sleep_state(component->dev);
727 
728 	return 0;
729 }
730 
731 /*
732  * Called by ALSA when a PCM substream is closed. Private data can be
733  * freed here. The cpu DAI, codec DAI, machine and components are also
734  * shutdown.
735  */
__soc_pcm_close(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)736 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
737 			   struct snd_pcm_substream *substream)
738 {
739 	return soc_pcm_clean(rtd, substream, 0);
740 }
741 
742 /* PCM close ops for non-DPCM streams */
soc_pcm_close(struct snd_pcm_substream * substream)743 static int soc_pcm_close(struct snd_pcm_substream *substream)
744 {
745 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
746 
747 	snd_soc_dpcm_mutex_lock(rtd);
748 	__soc_pcm_close(rtd, substream);
749 	snd_soc_dpcm_mutex_unlock(rtd);
750 	return 0;
751 }
752 
soc_hw_sanity_check(struct snd_pcm_substream * substream)753 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
754 {
755 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
756 	struct snd_pcm_hardware *hw = &substream->runtime->hw;
757 	const char *name_cpu = soc_cpu_dai_name(rtd);
758 	const char *name_codec = soc_codec_dai_name(rtd);
759 	const char *err_msg;
760 	struct device *dev = rtd->dev;
761 
762 	err_msg = "rates";
763 	if (!hw->rates)
764 		goto config_err;
765 
766 	err_msg = "formats";
767 	if (!hw->formats)
768 		goto config_err;
769 
770 	err_msg = "channels";
771 	if (!hw->channels_min || !hw->channels_max ||
772 	     hw->channels_min  >  hw->channels_max)
773 		goto config_err;
774 
775 	dev_dbg(dev, "ASoC: %s <-> %s info:\n",		name_codec,
776 							name_cpu);
777 	dev_dbg(dev, "ASoC: rate mask 0x%x\n",		hw->rates);
778 	dev_dbg(dev, "ASoC: ch   min %d max %d\n",	hw->channels_min,
779 							hw->channels_max);
780 	dev_dbg(dev, "ASoC: rate min %d max %d\n",	hw->rate_min,
781 							hw->rate_max);
782 
783 	return 0;
784 
785 config_err:
786 	dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
787 		name_codec, name_cpu, err_msg);
788 	return -EINVAL;
789 }
790 
791 /*
792  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
793  * then initialized and any private data can be allocated. This also calls
794  * startup for the cpu DAI, component, machine and codec DAI.
795  */
__soc_pcm_open(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)796 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
797 			  struct snd_pcm_substream *substream)
798 {
799 	struct snd_soc_component *component;
800 	struct snd_soc_dai *dai;
801 	int i, ret = 0;
802 
803 	snd_soc_dpcm_mutex_assert_held(rtd);
804 
805 	for_each_rtd_components(rtd, i, component)
806 		pinctrl_pm_select_default_state(component->dev);
807 
808 	ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
809 	if (ret < 0)
810 		goto err;
811 
812 	ret = soc_pcm_components_open(substream);
813 	if (ret < 0)
814 		goto err;
815 
816 	ret = snd_soc_link_startup(substream);
817 	if (ret < 0)
818 		goto err;
819 
820 	/* startup the audio subsystem */
821 	for_each_rtd_dais(rtd, i, dai) {
822 		ret = snd_soc_dai_startup(dai, substream);
823 		if (ret < 0)
824 			goto err;
825 	}
826 
827 	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
828 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
829 		goto dynamic;
830 
831 	/* Check that the codec and cpu DAIs are compatible */
832 	soc_pcm_init_runtime_hw(substream);
833 
834 	soc_pcm_update_symmetry(substream);
835 
836 	ret = soc_hw_sanity_check(substream);
837 	if (ret < 0)
838 		goto err;
839 
840 	soc_pcm_apply_msb(substream);
841 
842 	/* Symmetry only applies if we've already got an active stream. */
843 	for_each_rtd_dais(rtd, i, dai) {
844 		ret = soc_pcm_apply_symmetry(substream, dai);
845 		if (ret != 0)
846 			goto err;
847 	}
848 dynamic:
849 	snd_soc_runtime_activate(rtd, substream->stream);
850 	ret = 0;
851 err:
852 	if (ret < 0)
853 		soc_pcm_clean(rtd, substream, 1);
854 
855 	return soc_pcm_ret(rtd, ret);
856 }
857 
858 /* PCM open ops for non-DPCM streams */
soc_pcm_open(struct snd_pcm_substream * substream)859 static int soc_pcm_open(struct snd_pcm_substream *substream)
860 {
861 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
862 	int ret;
863 
864 	snd_soc_dpcm_mutex_lock(rtd);
865 	ret = __soc_pcm_open(rtd, substream);
866 	snd_soc_dpcm_mutex_unlock(rtd);
867 	return ret;
868 }
869 
870 /*
871  * Called by ALSA when the PCM substream is prepared, can set format, sample
872  * rate, etc.  This function is non atomic and can be called multiple times,
873  * it can refer to the runtime info.
874  */
__soc_pcm_prepare(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)875 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
876 			     struct snd_pcm_substream *substream)
877 {
878 	struct snd_soc_dai *dai;
879 	int i, ret = 0;
880 
881 	snd_soc_dpcm_mutex_assert_held(rtd);
882 
883 	ret = snd_soc_link_prepare(substream);
884 	if (ret < 0)
885 		goto out;
886 
887 	ret = snd_soc_pcm_component_prepare(substream);
888 	if (ret < 0)
889 		goto out;
890 
891 	ret = snd_soc_pcm_dai_prepare(substream);
892 	if (ret < 0)
893 		goto out;
894 
895 	/* cancel any delayed stream shutdown that is pending */
896 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
897 	    rtd->pop_wait) {
898 		rtd->pop_wait = 0;
899 		cancel_delayed_work(&rtd->delayed_work);
900 	}
901 
902 	snd_soc_dapm_stream_event(rtd, substream->stream,
903 			SND_SOC_DAPM_STREAM_START);
904 
905 	for_each_rtd_dais(rtd, i, dai)
906 		snd_soc_dai_digital_mute(dai, 0, substream->stream);
907 
908 out:
909 	return soc_pcm_ret(rtd, ret);
910 }
911 
912 /* PCM prepare ops for non-DPCM streams */
soc_pcm_prepare(struct snd_pcm_substream * substream)913 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
914 {
915 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
916 	int ret;
917 
918 	snd_soc_dpcm_mutex_lock(rtd);
919 	ret = __soc_pcm_prepare(rtd, substream);
920 	snd_soc_dpcm_mutex_unlock(rtd);
921 	return ret;
922 }
923 
soc_pcm_codec_params_fixup(struct snd_pcm_hw_params * params,unsigned int mask)924 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
925 				       unsigned int mask)
926 {
927 	struct snd_interval *interval;
928 	int channels = hweight_long(mask);
929 
930 	interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
931 	interval->min = channels;
932 	interval->max = channels;
933 }
934 
soc_pcm_hw_clean(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,int rollback)935 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
936 			    struct snd_pcm_substream *substream, int rollback)
937 {
938 	struct snd_soc_dai *dai;
939 	int i;
940 
941 	snd_soc_dpcm_mutex_assert_held(rtd);
942 
943 	/* clear the corresponding DAIs parameters when going to be inactive */
944 	for_each_rtd_dais(rtd, i, dai) {
945 		if (snd_soc_dai_active(dai) == 1)
946 			soc_pcm_set_dai_params(dai, NULL);
947 
948 		if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
949 			snd_soc_dai_digital_mute(dai, 1, substream->stream);
950 	}
951 
952 	/* run the stream event */
953 	snd_soc_dapm_stream_stop(rtd, substream->stream);
954 
955 	/* free any machine hw params */
956 	snd_soc_link_hw_free(substream, rollback);
957 
958 	/* free any component resources */
959 	snd_soc_pcm_component_hw_free(substream, rollback);
960 
961 	/* now free hw params for the DAIs  */
962 	for_each_rtd_dais(rtd, i, dai)
963 		if (snd_soc_dai_stream_valid(dai, substream->stream))
964 			snd_soc_dai_hw_free(dai, substream, rollback);
965 
966 	return 0;
967 }
968 
969 /*
970  * Frees resources allocated by hw_params, can be called multiple times
971  */
__soc_pcm_hw_free(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)972 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
973 			     struct snd_pcm_substream *substream)
974 {
975 	return soc_pcm_hw_clean(rtd, substream, 0);
976 }
977 
978 /* hw_free PCM ops for non-DPCM streams */
soc_pcm_hw_free(struct snd_pcm_substream * substream)979 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
980 {
981 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
982 	int ret;
983 
984 	snd_soc_dpcm_mutex_lock(rtd);
985 	ret = __soc_pcm_hw_free(rtd, substream);
986 	snd_soc_dpcm_mutex_unlock(rtd);
987 	return ret;
988 }
989 
990 /*
991  * Called by ALSA when the hardware params are set by application. This
992  * function can also be called multiple times and can allocate buffers
993  * (using snd_pcm_lib_* ). It's non-atomic.
994  */
__soc_pcm_hw_params(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)995 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
996 			       struct snd_pcm_substream *substream,
997 			       struct snd_pcm_hw_params *params)
998 {
999 	struct snd_soc_dai *cpu_dai;
1000 	struct snd_soc_dai *codec_dai;
1001 	int i, ret = 0;
1002 
1003 	snd_soc_dpcm_mutex_assert_held(rtd);
1004 
1005 	ret = soc_pcm_params_symmetry(substream, params);
1006 	if (ret)
1007 		goto out;
1008 
1009 	ret = snd_soc_link_hw_params(substream, params);
1010 	if (ret < 0)
1011 		goto out;
1012 
1013 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
1014 		struct snd_pcm_hw_params codec_params;
1015 
1016 		/*
1017 		 * Skip CODECs which don't support the current stream type,
1018 		 * the idea being that if a CODEC is not used for the currently
1019 		 * set up transfer direction, it should not need to be
1020 		 * configured, especially since the configuration used might
1021 		 * not even be supported by that CODEC. There may be cases
1022 		 * however where a CODEC needs to be set up although it is
1023 		 * actually not being used for the transfer, e.g. if a
1024 		 * capture-only CODEC is acting as an LRCLK and/or BCLK master
1025 		 * for the DAI link including a playback-only CODEC.
1026 		 * If this becomes necessary, we will have to augment the
1027 		 * machine driver setup with information on how to act, so
1028 		 * we can do the right thing here.
1029 		 */
1030 		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1031 			continue;
1032 
1033 		/* copy params for each codec */
1034 		codec_params = *params;
1035 
1036 		/* fixup params based on TDM slot masks */
1037 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1038 		    codec_dai->tx_mask)
1039 			soc_pcm_codec_params_fixup(&codec_params,
1040 						   codec_dai->tx_mask);
1041 
1042 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
1043 		    codec_dai->rx_mask)
1044 			soc_pcm_codec_params_fixup(&codec_params,
1045 						   codec_dai->rx_mask);
1046 
1047 		ret = snd_soc_dai_hw_params(codec_dai, substream,
1048 					    &codec_params);
1049 		if(ret < 0)
1050 			goto out;
1051 
1052 		soc_pcm_set_dai_params(codec_dai, &codec_params);
1053 		snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
1054 	}
1055 
1056 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1057 		/*
1058 		 * Skip CPUs which don't support the current stream
1059 		 * type. See soc_pcm_init_runtime_hw() for more details
1060 		 */
1061 		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1062 			continue;
1063 
1064 		ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
1065 		if (ret < 0)
1066 			goto out;
1067 
1068 		/* store the parameters for each DAI */
1069 		soc_pcm_set_dai_params(cpu_dai, params);
1070 		snd_soc_dapm_update_dai(substream, params, cpu_dai);
1071 	}
1072 
1073 	ret = snd_soc_pcm_component_hw_params(substream, params);
1074 out:
1075 	if (ret < 0)
1076 		soc_pcm_hw_clean(rtd, substream, 1);
1077 
1078 	return soc_pcm_ret(rtd, ret);
1079 }
1080 
1081 /* hw_params PCM ops for non-DPCM streams */
soc_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)1082 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1083 			     struct snd_pcm_hw_params *params)
1084 {
1085 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1086 	int ret;
1087 
1088 	snd_soc_dpcm_mutex_lock(rtd);
1089 	ret = __soc_pcm_hw_params(rtd, substream, params);
1090 	snd_soc_dpcm_mutex_unlock(rtd);
1091 	return ret;
1092 }
1093 
soc_pcm_trigger(struct snd_pcm_substream * substream,int cmd)1094 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1095 {
1096 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1097 	int ret = -EINVAL, _ret = 0;
1098 	int rollback = 0;
1099 
1100 	switch (cmd) {
1101 	case SNDRV_PCM_TRIGGER_START:
1102 	case SNDRV_PCM_TRIGGER_RESUME:
1103 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1104 		ret = snd_soc_link_trigger(substream, cmd, 0);
1105 		if (ret < 0)
1106 			goto start_err;
1107 
1108 		ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
1109 		if (ret < 0)
1110 			goto start_err;
1111 
1112 		ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
1113 start_err:
1114 		if (ret < 0)
1115 			rollback = 1;
1116 	}
1117 
1118 	if (rollback) {
1119 		_ret = ret;
1120 		switch (cmd) {
1121 		case SNDRV_PCM_TRIGGER_START:
1122 			cmd = SNDRV_PCM_TRIGGER_STOP;
1123 			break;
1124 		case SNDRV_PCM_TRIGGER_RESUME:
1125 			cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1126 			break;
1127 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1128 			cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1129 			break;
1130 		}
1131 	}
1132 
1133 	switch (cmd) {
1134 	case SNDRV_PCM_TRIGGER_STOP:
1135 	case SNDRV_PCM_TRIGGER_SUSPEND:
1136 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1137 		if (rtd->dai_link->stop_dma_first) {
1138 			ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1139 			if (ret < 0)
1140 				break;
1141 
1142 			ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1143 			if (ret < 0)
1144 				break;
1145 		} else {
1146 			ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
1147 			if (ret < 0)
1148 				break;
1149 
1150 			ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
1151 			if (ret < 0)
1152 				break;
1153 		}
1154 		ret = snd_soc_link_trigger(substream, cmd, rollback);
1155 		break;
1156 	}
1157 
1158 	if (_ret)
1159 		ret = _ret;
1160 
1161 	return ret;
1162 }
1163 
1164 /*
1165  * soc level wrapper for pointer callback
1166  * If cpu_dai, codec_dai, component driver has the delay callback, then
1167  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1168  */
soc_pcm_pointer(struct snd_pcm_substream * substream)1169 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1170 {
1171 	struct snd_pcm_runtime *runtime = substream->runtime;
1172 	snd_pcm_uframes_t offset = 0;
1173 	snd_pcm_sframes_t codec_delay = 0;
1174 	snd_pcm_sframes_t cpu_delay = 0;
1175 
1176 	offset = snd_soc_pcm_component_pointer(substream);
1177 
1178 	/* should be called *after* snd_soc_pcm_component_pointer() */
1179 	snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1180 	snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1181 
1182 	runtime->delay = cpu_delay + codec_delay;
1183 
1184 	return offset;
1185 }
1186 
1187 /* connect a FE and BE */
dpcm_be_connect(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1188 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1189 		struct snd_soc_pcm_runtime *be, int stream)
1190 {
1191 	struct snd_pcm_substream *fe_substream;
1192 	struct snd_pcm_substream *be_substream;
1193 	struct snd_soc_dpcm *dpcm;
1194 
1195 	snd_soc_dpcm_mutex_assert_held(fe);
1196 
1197 	/* only add new dpcms */
1198 	for_each_dpcm_be(fe, stream, dpcm) {
1199 		if (dpcm->be == be && dpcm->fe == fe)
1200 			return 0;
1201 	}
1202 
1203 	fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1204 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1205 
1206 	if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1207 		dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1208 			__func__);
1209 		return -EINVAL;
1210 	}
1211 	if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1212 		dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1213 		be_substream->pcm->nonatomic = 1;
1214 	}
1215 
1216 	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1217 	if (!dpcm)
1218 		return -ENOMEM;
1219 
1220 	dpcm->be = be;
1221 	dpcm->fe = fe;
1222 	be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1223 	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1224 	snd_soc_dpcm_stream_lock_irq(fe, stream);
1225 	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1226 	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1227 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
1228 
1229 	dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1230 			stream ? "capture" : "playback",  fe->dai_link->name,
1231 			stream ? "<-" : "->", be->dai_link->name);
1232 
1233 	dpcm_create_debugfs_state(dpcm, stream);
1234 
1235 	return 1;
1236 }
1237 
1238 /* reparent a BE onto another FE */
dpcm_be_reparent(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1239 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1240 			struct snd_soc_pcm_runtime *be, int stream)
1241 {
1242 	struct snd_soc_dpcm *dpcm;
1243 	struct snd_pcm_substream *fe_substream, *be_substream;
1244 
1245 	/* reparent if BE is connected to other FEs */
1246 	if (!be->dpcm[stream].users)
1247 		return;
1248 
1249 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1250 	if (!be_substream)
1251 		return;
1252 
1253 	for_each_dpcm_fe(be, stream, dpcm) {
1254 		if (dpcm->fe == fe)
1255 			continue;
1256 
1257 		dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1258 			stream ? "capture" : "playback",
1259 			dpcm->fe->dai_link->name,
1260 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1261 
1262 		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1263 		be_substream->runtime = fe_substream->runtime;
1264 		break;
1265 	}
1266 }
1267 
1268 /* disconnect a BE and FE */
dpcm_be_disconnect(struct snd_soc_pcm_runtime * fe,int stream)1269 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1270 {
1271 	struct snd_soc_dpcm *dpcm, *d;
1272 	LIST_HEAD(deleted_dpcms);
1273 
1274 	snd_soc_dpcm_mutex_assert_held(fe);
1275 
1276 	snd_soc_dpcm_stream_lock_irq(fe, stream);
1277 	for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1278 		dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1279 				stream ? "capture" : "playback",
1280 				dpcm->be->dai_link->name);
1281 
1282 		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1283 			continue;
1284 
1285 		dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1286 			stream ? "capture" : "playback", fe->dai_link->name,
1287 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1288 
1289 		/* BEs still alive need new FE */
1290 		dpcm_be_reparent(fe, dpcm->be, stream);
1291 
1292 		list_del(&dpcm->list_be);
1293 		list_move(&dpcm->list_fe, &deleted_dpcms);
1294 	}
1295 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
1296 
1297 	while (!list_empty(&deleted_dpcms)) {
1298 		dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1299 					list_fe);
1300 		list_del(&dpcm->list_fe);
1301 		dpcm_remove_debugfs_state(dpcm);
1302 		kfree(dpcm);
1303 	}
1304 }
1305 
1306 /* get BE for DAI widget and stream */
dpcm_get_be(struct snd_soc_card * card,struct snd_soc_dapm_widget * widget,int stream)1307 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1308 		struct snd_soc_dapm_widget *widget, int stream)
1309 {
1310 	struct snd_soc_pcm_runtime *be;
1311 	struct snd_soc_dapm_widget *w;
1312 	struct snd_soc_dai *dai;
1313 	int i;
1314 
1315 	dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1316 
1317 	for_each_card_rtds(card, be) {
1318 
1319 		if (!be->dai_link->no_pcm)
1320 			continue;
1321 
1322 		if (!snd_soc_dpcm_get_substream(be, stream))
1323 			continue;
1324 
1325 		for_each_rtd_dais(be, i, dai) {
1326 			w = snd_soc_dai_get_widget(dai, stream);
1327 
1328 			dev_dbg(card->dev, "ASoC: try BE : %s\n",
1329 				w ? w->name : "(not set)");
1330 
1331 			if (w == widget)
1332 				return be;
1333 		}
1334 	}
1335 
1336 	/* Widget provided is not a BE */
1337 	return NULL;
1338 }
1339 
widget_in_list(struct snd_soc_dapm_widget_list * list,struct snd_soc_dapm_widget * widget)1340 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1341 		struct snd_soc_dapm_widget *widget)
1342 {
1343 	struct snd_soc_dapm_widget *w;
1344 	int i;
1345 
1346 	for_each_dapm_widgets(list, i, w)
1347 		if (widget == w)
1348 			return 1;
1349 
1350 	return 0;
1351 }
1352 
dpcm_end_walk_at_be(struct snd_soc_dapm_widget * widget,enum snd_soc_dapm_direction dir)1353 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1354 {
1355 	struct snd_soc_card *card = widget->dapm->card;
1356 	struct snd_soc_pcm_runtime *rtd;
1357 	int stream;
1358 
1359 	/* adjust dir to stream */
1360 	if (dir == SND_SOC_DAPM_DIR_OUT)
1361 		stream = SNDRV_PCM_STREAM_PLAYBACK;
1362 	else
1363 		stream = SNDRV_PCM_STREAM_CAPTURE;
1364 
1365 	rtd = dpcm_get_be(card, widget, stream);
1366 	if (rtd)
1367 		return true;
1368 
1369 	return false;
1370 }
1371 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1372 
dpcm_path_get(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list)1373 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1374 	int stream, struct snd_soc_dapm_widget_list **list)
1375 {
1376 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1377 	int paths;
1378 
1379 	if (fe->dai_link->num_cpus > 1) {
1380 		dev_err(fe->dev,
1381 			"%s doesn't support Multi CPU yet\n", __func__);
1382 		return -EINVAL;
1383 	}
1384 
1385 	/* get number of valid DAI paths and their widgets */
1386 	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1387 			fe->card->component_chaining ?
1388 				NULL : dpcm_end_walk_at_be);
1389 
1390 	if (paths > 0)
1391 		dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1392 			stream ? "capture" : "playback");
1393 	else if (paths == 0)
1394 		dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1395 			 stream ? "capture" : "playback");
1396 
1397 	return paths;
1398 }
1399 
dpcm_path_put(struct snd_soc_dapm_widget_list ** list)1400 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1401 {
1402 	snd_soc_dapm_dai_free_widgets(list);
1403 }
1404 
dpcm_be_is_active(struct snd_soc_dpcm * dpcm,int stream,struct snd_soc_dapm_widget_list * list)1405 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1406 			      struct snd_soc_dapm_widget_list *list)
1407 {
1408 	struct snd_soc_dai *dai;
1409 	unsigned int i;
1410 
1411 	/* is there a valid DAI widget for this BE */
1412 	for_each_rtd_dais(dpcm->be, i, dai) {
1413 		struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1414 
1415 		/*
1416 		 * The BE is pruned only if none of the dai
1417 		 * widgets are in the active list.
1418 		 */
1419 		if (widget && widget_in_list(list, widget))
1420 			return true;
1421 	}
1422 
1423 	return false;
1424 }
1425 
dpcm_prune_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1426 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1427 			    struct snd_soc_dapm_widget_list **list_)
1428 {
1429 	struct snd_soc_dpcm *dpcm;
1430 	int prune = 0;
1431 
1432 	/* Destroy any old FE <--> BE connections */
1433 	for_each_dpcm_be(fe, stream, dpcm) {
1434 		if (dpcm_be_is_active(dpcm, stream, *list_))
1435 			continue;
1436 
1437 		dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1438 			stream ? "capture" : "playback",
1439 			dpcm->be->dai_link->name, fe->dai_link->name);
1440 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1441 		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1442 		prune++;
1443 	}
1444 
1445 	dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1446 	return prune;
1447 }
1448 
dpcm_add_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1449 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1450 	struct snd_soc_dapm_widget_list **list_)
1451 {
1452 	struct snd_soc_card *card = fe->card;
1453 	struct snd_soc_dapm_widget_list *list = *list_;
1454 	struct snd_soc_pcm_runtime *be;
1455 	struct snd_soc_dapm_widget *widget;
1456 	int i, new = 0, err;
1457 
1458 	/* don't connect if FE is not running */
1459 	if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1460 		return new;
1461 
1462 	/* Create any new FE <--> BE connections */
1463 	for_each_dapm_widgets(list, i, widget) {
1464 
1465 		switch (widget->id) {
1466 		case snd_soc_dapm_dai_in:
1467 			if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1468 				continue;
1469 			break;
1470 		case snd_soc_dapm_dai_out:
1471 			if (stream != SNDRV_PCM_STREAM_CAPTURE)
1472 				continue;
1473 			break;
1474 		default:
1475 			continue;
1476 		}
1477 
1478 		/* is there a valid BE rtd for this widget */
1479 		be = dpcm_get_be(card, widget, stream);
1480 		if (!be) {
1481 			dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1482 				widget->name);
1483 			continue;
1484 		}
1485 
1486 		/*
1487 		 * Filter for systems with 'component_chaining' enabled.
1488 		 * This helps to avoid unnecessary re-configuration of an
1489 		 * already active BE on such systems.
1490 		 */
1491 		if (fe->card->component_chaining &&
1492 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1493 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1494 			continue;
1495 
1496 		/* newly connected FE and BE */
1497 		err = dpcm_be_connect(fe, be, stream);
1498 		if (err < 0) {
1499 			dev_err(fe->dev, "ASoC: can't connect %s\n",
1500 				widget->name);
1501 			break;
1502 		} else if (err == 0) /* already connected */
1503 			continue;
1504 
1505 		/* new */
1506 		dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1507 		new++;
1508 	}
1509 
1510 	dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1511 	return new;
1512 }
1513 
1514 /*
1515  * Find the corresponding BE DAIs that source or sink audio to this
1516  * FE substream.
1517  */
dpcm_process_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list,int new)1518 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1519 	int stream, struct snd_soc_dapm_widget_list **list, int new)
1520 {
1521 	if (new)
1522 		return dpcm_add_paths(fe, stream, list);
1523 	else
1524 		return dpcm_prune_paths(fe, stream, list);
1525 }
1526 
dpcm_clear_pending_state(struct snd_soc_pcm_runtime * fe,int stream)1527 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1528 {
1529 	struct snd_soc_dpcm *dpcm;
1530 
1531 	for_each_dpcm_be(fe, stream, dpcm)
1532 		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1533 }
1534 
dpcm_be_dai_stop(struct snd_soc_pcm_runtime * fe,int stream,int do_hw_free,struct snd_soc_dpcm * last)1535 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1536 		      int do_hw_free, struct snd_soc_dpcm *last)
1537 {
1538 	struct snd_soc_dpcm *dpcm;
1539 
1540 	/* disable any enabled and non active backends */
1541 	for_each_dpcm_be(fe, stream, dpcm) {
1542 		struct snd_soc_pcm_runtime *be = dpcm->be;
1543 		struct snd_pcm_substream *be_substream =
1544 			snd_soc_dpcm_get_substream(be, stream);
1545 
1546 		if (dpcm == last)
1547 			return;
1548 
1549 		/* is this op for this BE ? */
1550 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1551 			continue;
1552 
1553 		if (be->dpcm[stream].users == 0) {
1554 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1555 				stream ? "capture" : "playback",
1556 				be->dpcm[stream].state);
1557 			continue;
1558 		}
1559 
1560 		if (--be->dpcm[stream].users != 0)
1561 			continue;
1562 
1563 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1564 			if (!do_hw_free)
1565 				continue;
1566 
1567 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1568 				__soc_pcm_hw_free(be, be_substream);
1569 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1570 			}
1571 		}
1572 
1573 		__soc_pcm_close(be, be_substream);
1574 		be_substream->runtime = NULL;
1575 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1576 	}
1577 }
1578 
dpcm_be_dai_startup(struct snd_soc_pcm_runtime * fe,int stream)1579 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1580 {
1581 	struct snd_soc_pcm_runtime *be;
1582 	struct snd_soc_dpcm *dpcm;
1583 	int err, count = 0;
1584 
1585 	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
1586 	for_each_dpcm_be(fe, stream, dpcm) {
1587 		struct snd_pcm_substream *be_substream;
1588 
1589 		be = dpcm->be;
1590 		be_substream = snd_soc_dpcm_get_substream(be, stream);
1591 
1592 		if (!be_substream) {
1593 			dev_err(be->dev, "ASoC: no backend %s stream\n",
1594 				stream ? "capture" : "playback");
1595 			continue;
1596 		}
1597 
1598 		/* is this op for this BE ? */
1599 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1600 			continue;
1601 
1602 		/* first time the dpcm is open ? */
1603 		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1604 			dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1605 				stream ? "capture" : "playback",
1606 				be->dpcm[stream].state);
1607 			continue;
1608 		}
1609 
1610 		if (be->dpcm[stream].users++ != 0)
1611 			continue;
1612 
1613 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1614 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1615 			continue;
1616 
1617 		dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1618 			stream ? "capture" : "playback", be->dai_link->name);
1619 
1620 		be_substream->runtime = be->dpcm[stream].runtime;
1621 		err = __soc_pcm_open(be, be_substream);
1622 		if (err < 0) {
1623 			be->dpcm[stream].users--;
1624 			if (be->dpcm[stream].users < 0)
1625 				dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1626 					stream ? "capture" : "playback",
1627 					be->dpcm[stream].state);
1628 
1629 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1630 			goto unwind;
1631 		}
1632 		be->dpcm[stream].be_start = 0;
1633 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1634 		count++;
1635 	}
1636 
1637 	return count;
1638 
1639 unwind:
1640 	dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1641 
1642 	return soc_pcm_ret(fe, err);
1643 }
1644 
dpcm_runtime_setup_fe(struct snd_pcm_substream * substream)1645 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1646 {
1647 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1648 	struct snd_pcm_runtime *runtime = substream->runtime;
1649 	struct snd_pcm_hardware *hw = &runtime->hw;
1650 	struct snd_soc_dai *dai;
1651 	int stream = substream->stream;
1652 	int i;
1653 
1654 	soc_pcm_hw_init(hw);
1655 
1656 	for_each_rtd_cpu_dais(fe, i, dai) {
1657 		struct snd_soc_pcm_stream *cpu_stream;
1658 
1659 		/*
1660 		 * Skip CPUs which don't support the current stream
1661 		 * type. See soc_pcm_init_runtime_hw() for more details
1662 		 */
1663 		if (!snd_soc_dai_stream_valid(dai, stream))
1664 			continue;
1665 
1666 		cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1667 
1668 		soc_pcm_hw_update_rate(hw, cpu_stream);
1669 		soc_pcm_hw_update_chan(hw, cpu_stream);
1670 		soc_pcm_hw_update_format(hw, cpu_stream);
1671 	}
1672 
1673 }
1674 
dpcm_runtime_setup_be_format(struct snd_pcm_substream * substream)1675 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1676 {
1677 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1678 	struct snd_pcm_runtime *runtime = substream->runtime;
1679 	struct snd_pcm_hardware *hw = &runtime->hw;
1680 	struct snd_soc_dpcm *dpcm;
1681 	struct snd_soc_dai *dai;
1682 	int stream = substream->stream;
1683 
1684 	if (!fe->dai_link->dpcm_merged_format)
1685 		return;
1686 
1687 	/*
1688 	 * It returns merged BE codec format
1689 	 * if FE want to use it (= dpcm_merged_format)
1690 	 */
1691 
1692 	for_each_dpcm_be(fe, stream, dpcm) {
1693 		struct snd_soc_pcm_runtime *be = dpcm->be;
1694 		struct snd_soc_pcm_stream *codec_stream;
1695 		int i;
1696 
1697 		for_each_rtd_codec_dais(be, i, dai) {
1698 			/*
1699 			 * Skip CODECs which don't support the current stream
1700 			 * type. See soc_pcm_init_runtime_hw() for more details
1701 			 */
1702 			if (!snd_soc_dai_stream_valid(dai, stream))
1703 				continue;
1704 
1705 			codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1706 
1707 			soc_pcm_hw_update_format(hw, codec_stream);
1708 		}
1709 	}
1710 }
1711 
dpcm_runtime_setup_be_chan(struct snd_pcm_substream * substream)1712 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1713 {
1714 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1715 	struct snd_pcm_runtime *runtime = substream->runtime;
1716 	struct snd_pcm_hardware *hw = &runtime->hw;
1717 	struct snd_soc_dpcm *dpcm;
1718 	int stream = substream->stream;
1719 
1720 	if (!fe->dai_link->dpcm_merged_chan)
1721 		return;
1722 
1723 	/*
1724 	 * It returns merged BE codec channel;
1725 	 * if FE want to use it (= dpcm_merged_chan)
1726 	 */
1727 
1728 	for_each_dpcm_be(fe, stream, dpcm) {
1729 		struct snd_soc_pcm_runtime *be = dpcm->be;
1730 		struct snd_soc_pcm_stream *cpu_stream;
1731 		struct snd_soc_dai *dai;
1732 		int i;
1733 
1734 		for_each_rtd_cpu_dais(be, i, dai) {
1735 			/*
1736 			 * Skip CPUs which don't support the current stream
1737 			 * type. See soc_pcm_init_runtime_hw() for more details
1738 			 */
1739 			if (!snd_soc_dai_stream_valid(dai, stream))
1740 				continue;
1741 
1742 			cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1743 
1744 			soc_pcm_hw_update_chan(hw, cpu_stream);
1745 		}
1746 
1747 		/*
1748 		 * chan min/max cannot be enforced if there are multiple CODEC
1749 		 * DAIs connected to a single CPU DAI, use CPU DAI's directly
1750 		 */
1751 		if (be->dai_link->num_codecs == 1) {
1752 			struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1753 				asoc_rtd_to_codec(be, 0), stream);
1754 
1755 			soc_pcm_hw_update_chan(hw, codec_stream);
1756 		}
1757 	}
1758 }
1759 
dpcm_runtime_setup_be_rate(struct snd_pcm_substream * substream)1760 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1761 {
1762 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1763 	struct snd_pcm_runtime *runtime = substream->runtime;
1764 	struct snd_pcm_hardware *hw = &runtime->hw;
1765 	struct snd_soc_dpcm *dpcm;
1766 	int stream = substream->stream;
1767 
1768 	if (!fe->dai_link->dpcm_merged_rate)
1769 		return;
1770 
1771 	/*
1772 	 * It returns merged BE codec channel;
1773 	 * if FE want to use it (= dpcm_merged_chan)
1774 	 */
1775 
1776 	for_each_dpcm_be(fe, stream, dpcm) {
1777 		struct snd_soc_pcm_runtime *be = dpcm->be;
1778 		struct snd_soc_pcm_stream *pcm;
1779 		struct snd_soc_dai *dai;
1780 		int i;
1781 
1782 		for_each_rtd_dais(be, i, dai) {
1783 			/*
1784 			 * Skip DAIs which don't support the current stream
1785 			 * type. See soc_pcm_init_runtime_hw() for more details
1786 			 */
1787 			if (!snd_soc_dai_stream_valid(dai, stream))
1788 				continue;
1789 
1790 			pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1791 
1792 			soc_pcm_hw_update_rate(hw, pcm);
1793 		}
1794 	}
1795 }
1796 
dpcm_apply_symmetry(struct snd_pcm_substream * fe_substream,int stream)1797 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1798 			       int stream)
1799 {
1800 	struct snd_soc_dpcm *dpcm;
1801 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1802 	struct snd_soc_dai *fe_cpu_dai;
1803 	int err = 0;
1804 	int i;
1805 
1806 	/* apply symmetry for FE */
1807 	soc_pcm_update_symmetry(fe_substream);
1808 
1809 	for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1810 		/* Symmetry only applies if we've got an active stream. */
1811 		err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1812 		if (err < 0)
1813 			goto error;
1814 	}
1815 
1816 	/* apply symmetry for BE */
1817 	for_each_dpcm_be(fe, stream, dpcm) {
1818 		struct snd_soc_pcm_runtime *be = dpcm->be;
1819 		struct snd_pcm_substream *be_substream =
1820 			snd_soc_dpcm_get_substream(be, stream);
1821 		struct snd_soc_pcm_runtime *rtd;
1822 		struct snd_soc_dai *dai;
1823 
1824 		/* A backend may not have the requested substream */
1825 		if (!be_substream)
1826 			continue;
1827 
1828 		rtd = asoc_substream_to_rtd(be_substream);
1829 		if (rtd->dai_link->be_hw_params_fixup)
1830 			continue;
1831 
1832 		soc_pcm_update_symmetry(be_substream);
1833 
1834 		/* Symmetry only applies if we've got an active stream. */
1835 		for_each_rtd_dais(rtd, i, dai) {
1836 			err = soc_pcm_apply_symmetry(fe_substream, dai);
1837 			if (err < 0)
1838 				goto error;
1839 		}
1840 	}
1841 error:
1842 	return soc_pcm_ret(fe, err);
1843 }
1844 
dpcm_fe_dai_startup(struct snd_pcm_substream * fe_substream)1845 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1846 {
1847 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1848 	int stream = fe_substream->stream, ret = 0;
1849 
1850 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1851 
1852 	ret = dpcm_be_dai_startup(fe, stream);
1853 	if (ret < 0)
1854 		goto be_err;
1855 
1856 	dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1857 
1858 	/* start the DAI frontend */
1859 	ret = __soc_pcm_open(fe, fe_substream);
1860 	if (ret < 0)
1861 		goto unwind;
1862 
1863 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1864 
1865 	dpcm_runtime_setup_fe(fe_substream);
1866 
1867 	dpcm_runtime_setup_be_format(fe_substream);
1868 	dpcm_runtime_setup_be_chan(fe_substream);
1869 	dpcm_runtime_setup_be_rate(fe_substream);
1870 
1871 	ret = dpcm_apply_symmetry(fe_substream, stream);
1872 
1873 unwind:
1874 	if (ret < 0)
1875 		dpcm_be_dai_startup_unwind(fe, stream);
1876 be_err:
1877 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1878 
1879 	return soc_pcm_ret(fe, ret);
1880 }
1881 
dpcm_fe_dai_shutdown(struct snd_pcm_substream * substream)1882 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1883 {
1884 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1885 	int stream = substream->stream;
1886 
1887 	snd_soc_dpcm_mutex_assert_held(fe);
1888 
1889 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1890 
1891 	/* shutdown the BEs */
1892 	dpcm_be_dai_shutdown(fe, stream);
1893 
1894 	dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1895 
1896 	/* now shutdown the frontend */
1897 	__soc_pcm_close(fe, substream);
1898 
1899 	/* run the stream stop event */
1900 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1901 
1902 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1903 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1904 	return 0;
1905 }
1906 
dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime * fe,int stream)1907 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1908 {
1909 	struct snd_soc_dpcm *dpcm;
1910 
1911 	/* only hw_params backends that are either sinks or sources
1912 	 * to this frontend DAI */
1913 	for_each_dpcm_be(fe, stream, dpcm) {
1914 
1915 		struct snd_soc_pcm_runtime *be = dpcm->be;
1916 		struct snd_pcm_substream *be_substream =
1917 			snd_soc_dpcm_get_substream(be, stream);
1918 
1919 		/* is this op for this BE ? */
1920 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1921 			continue;
1922 
1923 		/* only free hw when no longer used - check all FEs */
1924 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1925 				continue;
1926 
1927 		/* do not free hw if this BE is used by other FE */
1928 		if (be->dpcm[stream].users > 1)
1929 			continue;
1930 
1931 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1932 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1933 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1934 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1935 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1936 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1937 			continue;
1938 
1939 		dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1940 			be->dai_link->name);
1941 
1942 		__soc_pcm_hw_free(be, be_substream);
1943 
1944 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1945 	}
1946 }
1947 
dpcm_fe_dai_hw_free(struct snd_pcm_substream * substream)1948 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1949 {
1950 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1951 	int stream = substream->stream;
1952 
1953 	snd_soc_dpcm_mutex_lock(fe);
1954 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1955 
1956 	dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1957 
1958 	/* call hw_free on the frontend */
1959 	soc_pcm_hw_clean(fe, substream, 0);
1960 
1961 	/* only hw_params backends that are either sinks or sources
1962 	 * to this frontend DAI */
1963 	dpcm_be_dai_hw_free(fe, stream);
1964 
1965 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1966 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1967 
1968 	snd_soc_dpcm_mutex_unlock(fe);
1969 	return 0;
1970 }
1971 
dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime * fe,int stream)1972 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1973 {
1974 	struct snd_soc_pcm_runtime *be;
1975 	struct snd_pcm_substream *be_substream;
1976 	struct snd_soc_dpcm *dpcm;
1977 	int ret;
1978 
1979 	for_each_dpcm_be(fe, stream, dpcm) {
1980 		be = dpcm->be;
1981 		be_substream = snd_soc_dpcm_get_substream(be, stream);
1982 
1983 		/* is this op for this BE ? */
1984 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1985 			continue;
1986 
1987 		/* copy params for each dpcm */
1988 		memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1989 				sizeof(struct snd_pcm_hw_params));
1990 
1991 		/* perform any hw_params fixups */
1992 		ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
1993 		if (ret < 0)
1994 			goto unwind;
1995 
1996 		/* copy the fixed-up hw params for BE dai */
1997 		memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
1998 		       sizeof(struct snd_pcm_hw_params));
1999 
2000 		/* only allow hw_params() if no connected FEs are running */
2001 		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2002 			continue;
2003 
2004 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2005 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2006 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2007 			continue;
2008 
2009 		dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2010 			be->dai_link->name);
2011 
2012 		ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
2013 		if (ret < 0)
2014 			goto unwind;
2015 
2016 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2017 	}
2018 	return 0;
2019 
2020 unwind:
2021 	dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2022 		__func__, be->dai_link->name, ret);
2023 
2024 	/* disable any enabled and non active backends */
2025 	for_each_dpcm_be_rollback(fe, stream, dpcm) {
2026 		be = dpcm->be;
2027 		be_substream = snd_soc_dpcm_get_substream(be, stream);
2028 
2029 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2030 			continue;
2031 
2032 		/* only allow hw_free() if no connected FEs are running */
2033 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2034 			continue;
2035 
2036 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2037 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2038 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2039 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2040 			continue;
2041 
2042 		__soc_pcm_hw_free(be, be_substream);
2043 	}
2044 
2045 	return ret;
2046 }
2047 
dpcm_fe_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)2048 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2049 				 struct snd_pcm_hw_params *params)
2050 {
2051 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2052 	int ret, stream = substream->stream;
2053 
2054 	snd_soc_dpcm_mutex_lock(fe);
2055 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2056 
2057 	memcpy(&fe->dpcm[stream].hw_params, params,
2058 			sizeof(struct snd_pcm_hw_params));
2059 	ret = dpcm_be_dai_hw_params(fe, stream);
2060 	if (ret < 0)
2061 		goto out;
2062 
2063 	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2064 			fe->dai_link->name, params_rate(params),
2065 			params_channels(params), params_format(params));
2066 
2067 	/* call hw_params on the frontend */
2068 	ret = __soc_pcm_hw_params(fe, substream, params);
2069 	if (ret < 0)
2070 		dpcm_be_dai_hw_free(fe, stream);
2071 	else
2072 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2073 
2074 out:
2075 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2076 	snd_soc_dpcm_mutex_unlock(fe);
2077 
2078 	return soc_pcm_ret(fe, ret);
2079 }
2080 
dpcm_be_dai_trigger(struct snd_soc_pcm_runtime * fe,int stream,int cmd)2081 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2082 			       int cmd)
2083 {
2084 	struct snd_soc_pcm_runtime *be;
2085 	bool pause_stop_transition;
2086 	struct snd_soc_dpcm *dpcm;
2087 	unsigned long flags;
2088 	int ret = 0;
2089 
2090 	for_each_dpcm_be(fe, stream, dpcm) {
2091 		struct snd_pcm_substream *be_substream;
2092 
2093 		be = dpcm->be;
2094 		be_substream = snd_soc_dpcm_get_substream(be, stream);
2095 
2096 		snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2097 
2098 		/* is this op for this BE ? */
2099 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2100 			goto next;
2101 
2102 		dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2103 			be->dai_link->name, cmd);
2104 
2105 		switch (cmd) {
2106 		case SNDRV_PCM_TRIGGER_START:
2107 			if (!be->dpcm[stream].be_start &&
2108 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2109 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2110 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2111 				goto next;
2112 
2113 			be->dpcm[stream].be_start++;
2114 			if (be->dpcm[stream].be_start != 1)
2115 				goto next;
2116 
2117 			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2118 				ret = soc_pcm_trigger(be_substream,
2119 						      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2120 			else
2121 				ret = soc_pcm_trigger(be_substream,
2122 						      SNDRV_PCM_TRIGGER_START);
2123 			if (ret) {
2124 				be->dpcm[stream].be_start--;
2125 				goto next;
2126 			}
2127 
2128 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2129 			break;
2130 		case SNDRV_PCM_TRIGGER_RESUME:
2131 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2132 				goto next;
2133 
2134 			be->dpcm[stream].be_start++;
2135 			if (be->dpcm[stream].be_start != 1)
2136 				goto next;
2137 
2138 			ret = soc_pcm_trigger(be_substream, cmd);
2139 			if (ret) {
2140 				be->dpcm[stream].be_start--;
2141 				goto next;
2142 			}
2143 
2144 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2145 			break;
2146 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2147 			if (!be->dpcm[stream].be_start &&
2148 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2149 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2150 				goto next;
2151 
2152 			fe->dpcm[stream].fe_pause = false;
2153 			be->dpcm[stream].be_pause--;
2154 
2155 			be->dpcm[stream].be_start++;
2156 			if (be->dpcm[stream].be_start != 1)
2157 				goto next;
2158 
2159 			ret = soc_pcm_trigger(be_substream, cmd);
2160 			if (ret) {
2161 				be->dpcm[stream].be_start--;
2162 				goto next;
2163 			}
2164 
2165 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2166 			break;
2167 		case SNDRV_PCM_TRIGGER_STOP:
2168 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2169 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2170 				goto next;
2171 
2172 			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2173 				be->dpcm[stream].be_start--;
2174 
2175 			if (be->dpcm[stream].be_start != 0)
2176 				goto next;
2177 
2178 			pause_stop_transition = false;
2179 			if (fe->dpcm[stream].fe_pause) {
2180 				pause_stop_transition = true;
2181 				fe->dpcm[stream].fe_pause = false;
2182 				be->dpcm[stream].be_pause--;
2183 			}
2184 
2185 			if (be->dpcm[stream].be_pause != 0)
2186 				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2187 			else
2188 				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2189 
2190 			if (ret) {
2191 				if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2192 					be->dpcm[stream].be_start++;
2193 				if (pause_stop_transition) {
2194 					fe->dpcm[stream].fe_pause = true;
2195 					be->dpcm[stream].be_pause++;
2196 				}
2197 				goto next;
2198 			}
2199 
2200 			if (be->dpcm[stream].be_pause != 0)
2201 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2202 			else
2203 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2204 
2205 			break;
2206 		case SNDRV_PCM_TRIGGER_SUSPEND:
2207 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2208 				goto next;
2209 
2210 			be->dpcm[stream].be_start--;
2211 			if (be->dpcm[stream].be_start != 0)
2212 				goto next;
2213 
2214 			ret = soc_pcm_trigger(be_substream, cmd);
2215 			if (ret) {
2216 				be->dpcm[stream].be_start++;
2217 				goto next;
2218 			}
2219 
2220 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2221 			break;
2222 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2223 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2224 				goto next;
2225 
2226 			fe->dpcm[stream].fe_pause = true;
2227 			be->dpcm[stream].be_pause++;
2228 
2229 			be->dpcm[stream].be_start--;
2230 			if (be->dpcm[stream].be_start != 0)
2231 				goto next;
2232 
2233 			ret = soc_pcm_trigger(be_substream, cmd);
2234 			if (ret) {
2235 				be->dpcm[stream].be_start++;
2236 				goto next;
2237 			}
2238 
2239 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2240 			break;
2241 		}
2242 next:
2243 		snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2244 		if (ret)
2245 			break;
2246 	}
2247 	return soc_pcm_ret(fe, ret);
2248 }
2249 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2250 
dpcm_dai_trigger_fe_be(struct snd_pcm_substream * substream,int cmd,bool fe_first)2251 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2252 				  int cmd, bool fe_first)
2253 {
2254 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2255 	int ret;
2256 
2257 	/* call trigger on the frontend before the backend. */
2258 	if (fe_first) {
2259 		dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2260 			fe->dai_link->name, cmd);
2261 
2262 		ret = soc_pcm_trigger(substream, cmd);
2263 		if (ret < 0)
2264 			return ret;
2265 
2266 		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2267 		return ret;
2268 	}
2269 
2270 	/* call trigger on the frontend after the backend. */
2271 	ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2272 	if (ret < 0)
2273 		return ret;
2274 
2275 	dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2276 		fe->dai_link->name, cmd);
2277 
2278 	ret = soc_pcm_trigger(substream, cmd);
2279 
2280 	return ret;
2281 }
2282 
dpcm_fe_dai_do_trigger(struct snd_pcm_substream * substream,int cmd)2283 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2284 {
2285 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2286 	int stream = substream->stream;
2287 	int ret = 0;
2288 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2289 
2290 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2291 
2292 	switch (trigger) {
2293 	case SND_SOC_DPCM_TRIGGER_PRE:
2294 		switch (cmd) {
2295 		case SNDRV_PCM_TRIGGER_START:
2296 		case SNDRV_PCM_TRIGGER_RESUME:
2297 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2298 		case SNDRV_PCM_TRIGGER_DRAIN:
2299 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2300 			break;
2301 		case SNDRV_PCM_TRIGGER_STOP:
2302 		case SNDRV_PCM_TRIGGER_SUSPEND:
2303 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2304 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2305 			break;
2306 		default:
2307 			ret = -EINVAL;
2308 			break;
2309 		}
2310 		break;
2311 	case SND_SOC_DPCM_TRIGGER_POST:
2312 		switch (cmd) {
2313 		case SNDRV_PCM_TRIGGER_START:
2314 		case SNDRV_PCM_TRIGGER_RESUME:
2315 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2316 		case SNDRV_PCM_TRIGGER_DRAIN:
2317 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2318 			break;
2319 		case SNDRV_PCM_TRIGGER_STOP:
2320 		case SNDRV_PCM_TRIGGER_SUSPEND:
2321 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2322 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2323 			break;
2324 		default:
2325 			ret = -EINVAL;
2326 			break;
2327 		}
2328 		break;
2329 	case SND_SOC_DPCM_TRIGGER_BESPOKE:
2330 		/* bespoke trigger() - handles both FE and BEs */
2331 
2332 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2333 				fe->dai_link->name, cmd);
2334 
2335 		ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2336 		break;
2337 	default:
2338 		dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2339 				fe->dai_link->name);
2340 		ret = -EINVAL;
2341 		goto out;
2342 	}
2343 
2344 	if (ret < 0) {
2345 		dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2346 			cmd, ret);
2347 		goto out;
2348 	}
2349 
2350 	switch (cmd) {
2351 	case SNDRV_PCM_TRIGGER_START:
2352 	case SNDRV_PCM_TRIGGER_RESUME:
2353 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2354 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2355 		break;
2356 	case SNDRV_PCM_TRIGGER_STOP:
2357 	case SNDRV_PCM_TRIGGER_SUSPEND:
2358 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2359 		break;
2360 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2361 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2362 		break;
2363 	}
2364 
2365 out:
2366 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2367 	return ret;
2368 }
2369 
dpcm_fe_dai_trigger(struct snd_pcm_substream * substream,int cmd)2370 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2371 {
2372 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2373 	int stream = substream->stream;
2374 
2375 	/* if FE's runtime_update is already set, we're in race;
2376 	 * process this trigger later at exit
2377 	 */
2378 	if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2379 		fe->dpcm[stream].trigger_pending = cmd + 1;
2380 		return 0; /* delayed, assuming it's successful */
2381 	}
2382 
2383 	/* we're alone, let's trigger */
2384 	return dpcm_fe_dai_do_trigger(substream, cmd);
2385 }
2386 
dpcm_be_dai_prepare(struct snd_soc_pcm_runtime * fe,int stream)2387 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2388 {
2389 	struct snd_soc_dpcm *dpcm;
2390 	int ret = 0;
2391 
2392 	for_each_dpcm_be(fe, stream, dpcm) {
2393 
2394 		struct snd_soc_pcm_runtime *be = dpcm->be;
2395 		struct snd_pcm_substream *be_substream =
2396 			snd_soc_dpcm_get_substream(be, stream);
2397 
2398 		/* is this op for this BE ? */
2399 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2400 			continue;
2401 
2402 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2403 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2404 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2405 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2406 			continue;
2407 
2408 		dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2409 			be->dai_link->name);
2410 
2411 		ret = __soc_pcm_prepare(be, be_substream);
2412 		if (ret < 0)
2413 			break;
2414 
2415 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2416 	}
2417 
2418 	return soc_pcm_ret(fe, ret);
2419 }
2420 
dpcm_fe_dai_prepare(struct snd_pcm_substream * substream)2421 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2422 {
2423 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2424 	int stream = substream->stream, ret = 0;
2425 
2426 	snd_soc_dpcm_mutex_lock(fe);
2427 
2428 	dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2429 
2430 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2431 
2432 	/* there is no point preparing this FE if there are no BEs */
2433 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2434 		dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2435 				fe->dai_link->name);
2436 		ret = -EINVAL;
2437 		goto out;
2438 	}
2439 
2440 	ret = dpcm_be_dai_prepare(fe, stream);
2441 	if (ret < 0)
2442 		goto out;
2443 
2444 	/* call prepare on the frontend */
2445 	ret = __soc_pcm_prepare(fe, substream);
2446 	if (ret < 0)
2447 		goto out;
2448 
2449 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2450 
2451 out:
2452 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2453 	snd_soc_dpcm_mutex_unlock(fe);
2454 
2455 	return soc_pcm_ret(fe, ret);
2456 }
2457 
dpcm_run_update_shutdown(struct snd_soc_pcm_runtime * fe,int stream)2458 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2459 {
2460 	struct snd_pcm_substream *substream =
2461 		snd_soc_dpcm_get_substream(fe, stream);
2462 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2463 	int err;
2464 
2465 	dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2466 			stream ? "capture" : "playback", fe->dai_link->name);
2467 
2468 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2469 		/* call bespoke trigger - FE takes care of all BE triggers */
2470 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2471 				fe->dai_link->name);
2472 
2473 		err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2474 	} else {
2475 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2476 			fe->dai_link->name);
2477 
2478 		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2479 	}
2480 
2481 	dpcm_be_dai_hw_free(fe, stream);
2482 
2483 	dpcm_be_dai_shutdown(fe, stream);
2484 
2485 	/* run the stream event for each BE */
2486 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2487 
2488 	return soc_pcm_ret(fe, err);
2489 }
2490 
dpcm_run_update_startup(struct snd_soc_pcm_runtime * fe,int stream)2491 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2492 {
2493 	struct snd_pcm_substream *substream =
2494 		snd_soc_dpcm_get_substream(fe, stream);
2495 	struct snd_soc_dpcm *dpcm;
2496 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2497 	int ret = 0;
2498 
2499 	dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2500 			stream ? "capture" : "playback", fe->dai_link->name);
2501 
2502 	/* Only start the BE if the FE is ready */
2503 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2504 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2505 		dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2506 			fe->dai_link->name, fe->dpcm[stream].state);
2507 		ret = -EINVAL;
2508 		goto disconnect;
2509 	}
2510 
2511 	/* startup must always be called for new BEs */
2512 	ret = dpcm_be_dai_startup(fe, stream);
2513 	if (ret < 0)
2514 		goto disconnect;
2515 
2516 	/* keep going if FE state is > open */
2517 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2518 		return 0;
2519 
2520 	ret = dpcm_be_dai_hw_params(fe, stream);
2521 	if (ret < 0)
2522 		goto close;
2523 
2524 	/* keep going if FE state is > hw_params */
2525 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2526 		return 0;
2527 
2528 	ret = dpcm_be_dai_prepare(fe, stream);
2529 	if (ret < 0)
2530 		goto hw_free;
2531 
2532 	/* run the stream event for each BE */
2533 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2534 
2535 	/* keep going if FE state is > prepare */
2536 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2537 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2538 		return 0;
2539 
2540 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2541 		/* call trigger on the frontend - FE takes care of all BE triggers */
2542 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2543 				fe->dai_link->name);
2544 
2545 		ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2546 		if (ret < 0)
2547 			goto hw_free;
2548 	} else {
2549 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2550 			fe->dai_link->name);
2551 
2552 		ret = dpcm_be_dai_trigger(fe, stream,
2553 					SNDRV_PCM_TRIGGER_START);
2554 		if (ret < 0)
2555 			goto hw_free;
2556 	}
2557 
2558 	return 0;
2559 
2560 hw_free:
2561 	dpcm_be_dai_hw_free(fe, stream);
2562 close:
2563 	dpcm_be_dai_shutdown(fe, stream);
2564 disconnect:
2565 	/* disconnect any pending BEs */
2566 	for_each_dpcm_be(fe, stream, dpcm) {
2567 		struct snd_soc_pcm_runtime *be = dpcm->be;
2568 
2569 		/* is this op for this BE ? */
2570 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2571 			continue;
2572 
2573 		if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2574 			be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2575 				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2576 	}
2577 
2578 	return soc_pcm_ret(fe, ret);
2579 }
2580 
soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime * fe,int new)2581 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2582 {
2583 	struct snd_soc_dapm_widget_list *list;
2584 	int stream;
2585 	int count, paths;
2586 
2587 	if (!fe->dai_link->dynamic)
2588 		return 0;
2589 
2590 	if (fe->dai_link->num_cpus > 1) {
2591 		dev_err(fe->dev,
2592 			"%s doesn't support Multi CPU yet\n", __func__);
2593 		return -EINVAL;
2594 	}
2595 
2596 	/* only check active links */
2597 	if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2598 		return 0;
2599 
2600 	/* DAPM sync will call this to update DSP paths */
2601 	dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2602 		new ? "new" : "old", fe->dai_link->name);
2603 
2604 	for_each_pcm_streams(stream) {
2605 
2606 		/* skip if FE doesn't have playback/capture capability */
2607 		if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2608 		    !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2609 			continue;
2610 
2611 		/* skip if FE isn't currently playing/capturing */
2612 		if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2613 		    !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2614 			continue;
2615 
2616 		paths = dpcm_path_get(fe, stream, &list);
2617 		if (paths < 0)
2618 			return paths;
2619 
2620 		/* update any playback/capture paths */
2621 		count = dpcm_process_paths(fe, stream, &list, new);
2622 		if (count) {
2623 			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2624 			if (new)
2625 				dpcm_run_update_startup(fe, stream);
2626 			else
2627 				dpcm_run_update_shutdown(fe, stream);
2628 			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2629 
2630 			dpcm_clear_pending_state(fe, stream);
2631 			dpcm_be_disconnect(fe, stream);
2632 		}
2633 
2634 		dpcm_path_put(&list);
2635 	}
2636 
2637 	return 0;
2638 }
2639 
2640 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2641  * any DAI links.
2642  */
snd_soc_dpcm_runtime_update(struct snd_soc_card * card)2643 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2644 {
2645 	struct snd_soc_pcm_runtime *fe;
2646 	int ret = 0;
2647 
2648 	mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
2649 	/* shutdown all old paths first */
2650 	for_each_card_rtds(card, fe) {
2651 		ret = soc_dpcm_fe_runtime_update(fe, 0);
2652 		if (ret)
2653 			goto out;
2654 	}
2655 
2656 	/* bring new paths up */
2657 	for_each_card_rtds(card, fe) {
2658 		ret = soc_dpcm_fe_runtime_update(fe, 1);
2659 		if (ret)
2660 			goto out;
2661 	}
2662 
2663 out:
2664 	mutex_unlock(&card->pcm_mutex);
2665 	return ret;
2666 }
2667 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2668 
dpcm_fe_dai_cleanup(struct snd_pcm_substream * fe_substream)2669 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2670 {
2671 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2672 	struct snd_soc_dpcm *dpcm;
2673 	int stream = fe_substream->stream;
2674 
2675 	snd_soc_dpcm_mutex_assert_held(fe);
2676 
2677 	/* mark FE's links ready to prune */
2678 	for_each_dpcm_be(fe, stream, dpcm)
2679 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2680 
2681 	dpcm_be_disconnect(fe, stream);
2682 
2683 	fe->dpcm[stream].runtime = NULL;
2684 }
2685 
dpcm_fe_dai_close(struct snd_pcm_substream * fe_substream)2686 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2687 {
2688 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2689 	int ret;
2690 
2691 	snd_soc_dpcm_mutex_lock(fe);
2692 	ret = dpcm_fe_dai_shutdown(fe_substream);
2693 
2694 	dpcm_fe_dai_cleanup(fe_substream);
2695 
2696 	snd_soc_dpcm_mutex_unlock(fe);
2697 	return ret;
2698 }
2699 
dpcm_fe_dai_open(struct snd_pcm_substream * fe_substream)2700 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2701 {
2702 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2703 	struct snd_soc_dapm_widget_list *list;
2704 	int ret;
2705 	int stream = fe_substream->stream;
2706 
2707 	snd_soc_dpcm_mutex_lock(fe);
2708 	fe->dpcm[stream].runtime = fe_substream->runtime;
2709 
2710 	ret = dpcm_path_get(fe, stream, &list);
2711 	if (ret < 0)
2712 		goto open_end;
2713 
2714 	/* calculate valid and active FE <-> BE dpcms */
2715 	dpcm_process_paths(fe, stream, &list, 1);
2716 
2717 	ret = dpcm_fe_dai_startup(fe_substream);
2718 	if (ret < 0)
2719 		dpcm_fe_dai_cleanup(fe_substream);
2720 
2721 	dpcm_clear_pending_state(fe, stream);
2722 	dpcm_path_put(&list);
2723 open_end:
2724 	snd_soc_dpcm_mutex_unlock(fe);
2725 	return ret;
2726 }
2727 
soc_get_playback_capture(struct snd_soc_pcm_runtime * rtd,int * playback,int * capture)2728 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2729 				    int *playback, int *capture)
2730 {
2731 	struct snd_soc_dai *cpu_dai;
2732 	int i;
2733 
2734 	if (rtd->dai_link->dynamic && rtd->dai_link->num_cpus > 1) {
2735 		dev_err(rtd->dev,
2736 			"DPCM doesn't support Multi CPU for Front-Ends yet\n");
2737 		return -EINVAL;
2738 	}
2739 
2740 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2741 		int stream;
2742 
2743 		if (rtd->dai_link->dpcm_playback) {
2744 			stream = SNDRV_PCM_STREAM_PLAYBACK;
2745 
2746 			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2747 				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2748 					*playback = 1;
2749 					break;
2750 				}
2751 			}
2752 			if (!*playback) {
2753 				dev_err(rtd->card->dev,
2754 					"No CPU DAIs support playback for stream %s\n",
2755 					rtd->dai_link->stream_name);
2756 				return -EINVAL;
2757 			}
2758 		}
2759 		if (rtd->dai_link->dpcm_capture) {
2760 			stream = SNDRV_PCM_STREAM_CAPTURE;
2761 
2762 			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2763 				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2764 					*capture = 1;
2765 					break;
2766 				}
2767 			}
2768 
2769 			if (!*capture) {
2770 				dev_err(rtd->card->dev,
2771 					"No CPU DAIs support capture for stream %s\n",
2772 					rtd->dai_link->stream_name);
2773 				return -EINVAL;
2774 			}
2775 		}
2776 	} else {
2777 		struct snd_soc_dai *codec_dai;
2778 
2779 		/* Adapt stream for codec2codec links */
2780 		int cpu_capture = rtd->dai_link->params ?
2781 			SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
2782 		int cpu_playback = rtd->dai_link->params ?
2783 			SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2784 
2785 		for_each_rtd_codec_dais(rtd, i, codec_dai) {
2786 			if (rtd->dai_link->num_cpus == 1) {
2787 				cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2788 			} else if (rtd->dai_link->num_cpus == rtd->dai_link->num_codecs) {
2789 				cpu_dai = asoc_rtd_to_cpu(rtd, i);
2790 			} else {
2791 				dev_err(rtd->card->dev,
2792 					"N cpus to M codecs link is not supported yet\n");
2793 				return -EINVAL;
2794 			}
2795 
2796 			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2797 			    snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2798 				*playback = 1;
2799 			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2800 			    snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2801 				*capture = 1;
2802 		}
2803 	}
2804 
2805 	if (rtd->dai_link->playback_only) {
2806 		*playback = 1;
2807 		*capture = 0;
2808 	}
2809 
2810 	if (rtd->dai_link->capture_only) {
2811 		*playback = 0;
2812 		*capture = 1;
2813 	}
2814 
2815 	return 0;
2816 }
2817 
soc_create_pcm(struct snd_pcm ** pcm,struct snd_soc_pcm_runtime * rtd,int playback,int capture,int num)2818 static int soc_create_pcm(struct snd_pcm **pcm,
2819 			  struct snd_soc_pcm_runtime *rtd,
2820 			  int playback, int capture, int num)
2821 {
2822 	char new_name[64];
2823 	int ret;
2824 
2825 	/* create the PCM */
2826 	if (rtd->dai_link->params) {
2827 		snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2828 			 rtd->dai_link->stream_name);
2829 
2830 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2831 					   playback, capture, pcm);
2832 	} else if (rtd->dai_link->no_pcm) {
2833 		snprintf(new_name, sizeof(new_name), "(%s)",
2834 			rtd->dai_link->stream_name);
2835 
2836 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2837 				playback, capture, pcm);
2838 	} else {
2839 		if (rtd->dai_link->dynamic)
2840 			snprintf(new_name, sizeof(new_name), "%s (*)",
2841 				rtd->dai_link->stream_name);
2842 		else
2843 			snprintf(new_name, sizeof(new_name), "%s %s-%d",
2844 				rtd->dai_link->stream_name,
2845 				soc_codec_dai_name(rtd), num);
2846 
2847 		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2848 			capture, pcm);
2849 	}
2850 	if (ret < 0) {
2851 		dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2852 			new_name, rtd->dai_link->name, ret);
2853 		return ret;
2854 	}
2855 	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2856 
2857 	return 0;
2858 }
2859 
2860 /* create a new pcm */
soc_new_pcm(struct snd_soc_pcm_runtime * rtd,int num)2861 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2862 {
2863 	struct snd_soc_component *component;
2864 	struct snd_pcm *pcm;
2865 	int ret = 0, playback = 0, capture = 0;
2866 	int i;
2867 
2868 	ret = soc_get_playback_capture(rtd, &playback, &capture);
2869 	if (ret < 0)
2870 		return ret;
2871 
2872 	ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2873 	if (ret < 0)
2874 		return ret;
2875 
2876 	/* DAPM dai link stream work */
2877 	/*
2878 	 * Currently nothing to do for c2c links
2879 	 * Since c2c links are internal nodes in the DAPM graph and
2880 	 * don't interface with the outside world or application layer
2881 	 * we don't have to do any special handling on close.
2882 	 */
2883 	if (!rtd->dai_link->params)
2884 		rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2885 
2886 	rtd->pcm = pcm;
2887 	pcm->nonatomic = rtd->dai_link->nonatomic;
2888 	pcm->private_data = rtd;
2889 	pcm->no_device_suspend = true;
2890 
2891 	if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
2892 		if (playback)
2893 			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2894 		if (capture)
2895 			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2896 		goto out;
2897 	}
2898 
2899 	/* ASoC PCM operations */
2900 	if (rtd->dai_link->dynamic) {
2901 		rtd->ops.open		= dpcm_fe_dai_open;
2902 		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
2903 		rtd->ops.prepare	= dpcm_fe_dai_prepare;
2904 		rtd->ops.trigger	= dpcm_fe_dai_trigger;
2905 		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
2906 		rtd->ops.close		= dpcm_fe_dai_close;
2907 		rtd->ops.pointer	= soc_pcm_pointer;
2908 	} else {
2909 		rtd->ops.open		= soc_pcm_open;
2910 		rtd->ops.hw_params	= soc_pcm_hw_params;
2911 		rtd->ops.prepare	= soc_pcm_prepare;
2912 		rtd->ops.trigger	= soc_pcm_trigger;
2913 		rtd->ops.hw_free	= soc_pcm_hw_free;
2914 		rtd->ops.close		= soc_pcm_close;
2915 		rtd->ops.pointer	= soc_pcm_pointer;
2916 	}
2917 
2918 	for_each_rtd_components(rtd, i, component) {
2919 		const struct snd_soc_component_driver *drv = component->driver;
2920 
2921 		if (drv->ioctl)
2922 			rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
2923 		if (drv->sync_stop)
2924 			rtd->ops.sync_stop	= snd_soc_pcm_component_sync_stop;
2925 		if (drv->copy_user)
2926 			rtd->ops.copy_user	= snd_soc_pcm_component_copy_user;
2927 		if (drv->page)
2928 			rtd->ops.page		= snd_soc_pcm_component_page;
2929 		if (drv->mmap)
2930 			rtd->ops.mmap		= snd_soc_pcm_component_mmap;
2931 		if (drv->ack)
2932 			rtd->ops.ack            = snd_soc_pcm_component_ack;
2933 	}
2934 
2935 	if (playback)
2936 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2937 
2938 	if (capture)
2939 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2940 
2941 	ret = snd_soc_pcm_component_new(rtd);
2942 	if (ret < 0)
2943 		return ret;
2944 out:
2945 	dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
2946 		soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
2947 	return ret;
2948 }
2949 
2950 /* is the current PCM operation for this FE ? */
snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime * fe,int stream)2951 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2952 {
2953 	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2954 		return 1;
2955 	return 0;
2956 }
2957 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2958 
2959 /* 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)2960 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2961 		struct snd_soc_pcm_runtime *be, int stream)
2962 {
2963 	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2964 	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2965 		  be->dpcm[stream].runtime_update))
2966 		return 1;
2967 	return 0;
2968 }
2969 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2970 
2971 /* get the substream for this BE */
2972 struct snd_pcm_substream *
snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime * be,int stream)2973 	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2974 {
2975 	return be->pcm->streams[stream].substream;
2976 }
2977 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2978 
snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream,const enum snd_soc_dpcm_state * states,int num_states)2979 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
2980 				    struct snd_soc_pcm_runtime *be,
2981 				    int stream,
2982 				    const enum snd_soc_dpcm_state *states,
2983 				    int num_states)
2984 {
2985 	struct snd_soc_dpcm *dpcm;
2986 	int state;
2987 	int ret = 1;
2988 	int i;
2989 
2990 	for_each_dpcm_fe(be, stream, dpcm) {
2991 
2992 		if (dpcm->fe == fe)
2993 			continue;
2994 
2995 		state = dpcm->fe->dpcm[stream].state;
2996 		for (i = 0; i < num_states; i++) {
2997 			if (state == states[i]) {
2998 				ret = 0;
2999 				break;
3000 			}
3001 		}
3002 	}
3003 
3004 	/* it's safe to do this BE DAI */
3005 	return ret;
3006 }
3007 
3008 /*
3009  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3010  * are not running, paused or suspended for the specified stream direction.
3011  */
snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)3012 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3013 		struct snd_soc_pcm_runtime *be, int stream)
3014 {
3015 	const enum snd_soc_dpcm_state state[] = {
3016 		SND_SOC_DPCM_STATE_START,
3017 		SND_SOC_DPCM_STATE_PAUSED,
3018 		SND_SOC_DPCM_STATE_SUSPEND,
3019 	};
3020 
3021 	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3022 }
3023 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3024 
3025 /*
3026  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3027  * running, paused or suspended for the specified stream direction.
3028  */
snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)3029 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3030 		struct snd_soc_pcm_runtime *be, int stream)
3031 {
3032 	const enum snd_soc_dpcm_state state[] = {
3033 		SND_SOC_DPCM_STATE_START,
3034 		SND_SOC_DPCM_STATE_PAUSED,
3035 		SND_SOC_DPCM_STATE_SUSPEND,
3036 		SND_SOC_DPCM_STATE_PREPARE,
3037 	};
3038 
3039 	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3040 }
3041 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3042