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/slab.h>
18 #include <linux/workqueue.h>
19 #include <linux/export.h>
20 #include <linux/debugfs.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/soc-dpcm.h>
26 #include <sound/soc-link.h>
27 #include <sound/initval.h>
28 
29 #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)30 static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
31 			       const char *func, int ret)
32 {
33 	/* Positive, Zero values are not errors */
34 	if (ret >= 0)
35 		return ret;
36 
37 	/* Negative values might be errors */
38 	switch (ret) {
39 	case -EPROBE_DEFER:
40 	case -ENOTSUPP:
41 	case -EINVAL:
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_stream_lock_irq(struct snd_soc_pcm_runtime * rtd,int stream)52 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
53 						int stream)
54 {
55 	snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
56 }
57 
58 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
59 	snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
60 
snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime * rtd,int stream)61 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
62 						  int stream)
63 {
64 	snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
65 }
66 
67 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
68 	snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
69 
70 #define DPCM_MAX_BE_USERS	8
71 
soc_cpu_dai_name(struct snd_soc_pcm_runtime * rtd)72 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
73 {
74 	return (rtd)->dai_link->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
75 }
soc_codec_dai_name(struct snd_soc_pcm_runtime * rtd)76 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
77 {
78 	return (rtd)->dai_link->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
79 }
80 
81 #ifdef CONFIG_DEBUG_FS
dpcm_state_string(enum snd_soc_dpcm_state state)82 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
83 {
84 	switch (state) {
85 	case SND_SOC_DPCM_STATE_NEW:
86 		return "new";
87 	case SND_SOC_DPCM_STATE_OPEN:
88 		return "open";
89 	case SND_SOC_DPCM_STATE_HW_PARAMS:
90 		return "hw_params";
91 	case SND_SOC_DPCM_STATE_PREPARE:
92 		return "prepare";
93 	case SND_SOC_DPCM_STATE_START:
94 		return "start";
95 	case SND_SOC_DPCM_STATE_STOP:
96 		return "stop";
97 	case SND_SOC_DPCM_STATE_SUSPEND:
98 		return "suspend";
99 	case SND_SOC_DPCM_STATE_PAUSED:
100 		return "paused";
101 	case SND_SOC_DPCM_STATE_HW_FREE:
102 		return "hw_free";
103 	case SND_SOC_DPCM_STATE_CLOSE:
104 		return "close";
105 	}
106 
107 	return "unknown";
108 }
109 
dpcm_show_state(struct snd_soc_pcm_runtime * fe,int stream,char * buf,size_t size)110 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
111 			       int stream, char *buf, size_t size)
112 {
113 	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
114 	struct snd_soc_dpcm *dpcm;
115 	ssize_t offset = 0;
116 
117 	/* FE state */
118 	offset += scnprintf(buf + offset, size - offset,
119 			   "[%s - %s]\n", fe->dai_link->name,
120 			   stream ? "Capture" : "Playback");
121 
122 	offset += scnprintf(buf + offset, size - offset, "State: %s\n",
123 			   dpcm_state_string(fe->dpcm[stream].state));
124 
125 	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
126 	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
127 		offset += scnprintf(buf + offset, size - offset,
128 				   "Hardware Params: "
129 				   "Format = %s, Channels = %d, Rate = %d\n",
130 				   snd_pcm_format_name(params_format(params)),
131 				   params_channels(params),
132 				   params_rate(params));
133 
134 	/* BEs state */
135 	offset += scnprintf(buf + offset, size - offset, "Backends:\n");
136 
137 	if (list_empty(&fe->dpcm[stream].be_clients)) {
138 		offset += scnprintf(buf + offset, size - offset,
139 				   " No active DSP links\n");
140 		goto out;
141 	}
142 
143 	for_each_dpcm_be(fe, stream, dpcm) {
144 		struct snd_soc_pcm_runtime *be = dpcm->be;
145 		params = &be->dpcm[stream].hw_params;
146 
147 		offset += scnprintf(buf + offset, size - offset,
148 				   "- %s\n", be->dai_link->name);
149 
150 		offset += scnprintf(buf + offset, size - offset,
151 				   "   State: %s\n",
152 				   dpcm_state_string(be->dpcm[stream].state));
153 
154 		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
155 		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
156 			offset += scnprintf(buf + offset, size - offset,
157 					   "   Hardware Params: "
158 					   "Format = %s, Channels = %d, Rate = %d\n",
159 					   snd_pcm_format_name(params_format(params)),
160 					   params_channels(params),
161 					   params_rate(params));
162 	}
163 out:
164 	return offset;
165 }
166 
dpcm_state_read_file(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)167 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
168 				    size_t count, loff_t *ppos)
169 {
170 	struct snd_soc_pcm_runtime *fe = file->private_data;
171 	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
172 	int stream;
173 	char *buf;
174 
175 	if (fe->dai_link->num_cpus > 1) {
176 		dev_err(fe->dev,
177 			"%s doesn't support Multi CPU yet\n", __func__);
178 		return -EINVAL;
179 	}
180 
181 	buf = kmalloc(out_count, GFP_KERNEL);
182 	if (!buf)
183 		return -ENOMEM;
184 
185 	snd_soc_dpcm_mutex_lock(fe);
186 	for_each_pcm_streams(stream)
187 		if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
188 			offset += dpcm_show_state(fe, stream,
189 						  buf + offset,
190 						  out_count - offset);
191 	snd_soc_dpcm_mutex_unlock(fe);
192 
193 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
194 
195 	kfree(buf);
196 	return ret;
197 }
198 
199 static const struct file_operations dpcm_state_fops = {
200 	.open = simple_open,
201 	.read = dpcm_state_read_file,
202 	.llseek = default_llseek,
203 };
204 
soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime * rtd)205 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
206 {
207 	if (!rtd->dai_link->dynamic)
208 		return;
209 
210 	if (!rtd->card->debugfs_card_root)
211 		return;
212 
213 	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
214 						    rtd->card->debugfs_card_root);
215 
216 	debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
217 			    rtd, &dpcm_state_fops);
218 }
219 
dpcm_create_debugfs_state(struct snd_soc_dpcm * dpcm,int stream)220 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
221 {
222 	char *name;
223 
224 	name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
225 			 stream ? "capture" : "playback");
226 	if (name) {
227 		dpcm->debugfs_state = debugfs_create_dir(
228 			name, dpcm->fe->debugfs_dpcm_root);
229 		debugfs_create_u32("state", 0644, dpcm->debugfs_state,
230 				   &dpcm->state);
231 		kfree(name);
232 	}
233 }
234 
dpcm_remove_debugfs_state(struct snd_soc_dpcm * dpcm)235 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
236 {
237 	debugfs_remove_recursive(dpcm->debugfs_state);
238 }
239 
240 #else
dpcm_create_debugfs_state(struct snd_soc_dpcm * dpcm,int stream)241 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
242 					     int stream)
243 {
244 }
245 
dpcm_remove_debugfs_state(struct snd_soc_dpcm * dpcm)246 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
247 {
248 }
249 #endif
250 
251 /* Set FE's runtime_update state; the state is protected via PCM stream lock
252  * for avoiding the race with trigger callback.
253  * If the state is unset and a trigger is pending while the previous operation,
254  * process the pending trigger action here.
255  */
256 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)257 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
258 				     int stream, enum snd_soc_dpcm_update state)
259 {
260 	struct snd_pcm_substream *substream =
261 		snd_soc_dpcm_get_substream(fe, stream);
262 
263 	snd_soc_dpcm_stream_lock_irq(fe, stream);
264 	if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
265 		dpcm_fe_dai_do_trigger(substream,
266 				       fe->dpcm[stream].trigger_pending - 1);
267 		fe->dpcm[stream].trigger_pending = 0;
268 	}
269 	fe->dpcm[stream].runtime_update = state;
270 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
271 }
272 
dpcm_set_be_update_state(struct snd_soc_pcm_runtime * be,int stream,enum snd_soc_dpcm_update state)273 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
274 				     int stream, enum snd_soc_dpcm_update state)
275 {
276 	be->dpcm[stream].runtime_update = state;
277 }
278 
279 /**
280  * snd_soc_runtime_action() - Increment/Decrement active count for
281  * PCM runtime components
282  * @rtd: ASoC PCM runtime that is activated
283  * @stream: Direction of the PCM stream
284  * @action: Activate stream if 1. Deactivate if -1.
285  *
286  * Increments/Decrements the active count for all the DAIs and components
287  * attached to a PCM runtime.
288  * Should typically be called when a stream is opened.
289  *
290  * Must be called with the rtd->card->pcm_mutex being held
291  */
snd_soc_runtime_action(struct snd_soc_pcm_runtime * rtd,int stream,int action)292 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
293 			    int stream, int action)
294 {
295 	struct snd_soc_dai *dai;
296 	int i;
297 
298 	snd_soc_dpcm_mutex_assert_held(rtd);
299 
300 	for_each_rtd_dais(rtd, i, dai)
301 		snd_soc_dai_action(dai, stream, action);
302 }
303 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
304 
305 /**
306  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
307  * @rtd: The ASoC PCM runtime that should be checked.
308  *
309  * This function checks whether the power down delay should be ignored for a
310  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
311  * been configured to ignore the delay, or if none of the components benefits
312  * from having the delay.
313  */
snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime * rtd)314 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
315 {
316 	struct snd_soc_component *component;
317 	bool ignore = true;
318 	int i;
319 
320 	if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
321 		return true;
322 
323 	for_each_rtd_components(rtd, i, component)
324 		ignore &= !component->driver->use_pmdown_time;
325 
326 	return ignore;
327 }
328 
329 /**
330  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
331  * @substream: the pcm substream
332  * @hw: the hardware parameters
333  *
334  * Sets the substream runtime hardware parameters.
335  */
snd_soc_set_runtime_hwparams(struct snd_pcm_substream * substream,const struct snd_pcm_hardware * hw)336 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
337 	const struct snd_pcm_hardware *hw)
338 {
339 	substream->runtime->hw = *hw;
340 
341 	return 0;
342 }
343 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
344 
345 /* 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)346 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
347 	int event)
348 {
349 	struct snd_soc_dpcm *dpcm;
350 
351 	snd_soc_dpcm_mutex_assert_held(fe);
352 
353 	for_each_dpcm_be(fe, dir, dpcm) {
354 
355 		struct snd_soc_pcm_runtime *be = dpcm->be;
356 
357 		dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
358 				be->dai_link->name, event, dir);
359 
360 		if ((event == SND_SOC_DAPM_STREAM_STOP) &&
361 		    (be->dpcm[dir].users >= 1))
362 			continue;
363 
364 		snd_soc_dapm_stream_event(be, dir, event);
365 	}
366 
367 	snd_soc_dapm_stream_event(fe, dir, event);
368 
369 	return 0;
370 }
371 
soc_pcm_set_dai_params(struct snd_soc_dai * dai,struct snd_pcm_hw_params * params)372 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
373 				   struct snd_pcm_hw_params *params)
374 {
375 	if (params) {
376 		dai->rate	 = params_rate(params);
377 		dai->channels	 = params_channels(params);
378 		dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
379 	} else {
380 		dai->rate	 = 0;
381 		dai->channels	 = 0;
382 		dai->sample_bits = 0;
383 	}
384 }
385 
soc_pcm_apply_symmetry(struct snd_pcm_substream * substream,struct snd_soc_dai * soc_dai)386 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
387 					struct snd_soc_dai *soc_dai)
388 {
389 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
390 	int ret;
391 
392 	if (!snd_soc_dai_active(soc_dai))
393 		return 0;
394 
395 #define __soc_pcm_apply_symmetry(name, NAME)				\
396 	if (soc_dai->name && (soc_dai->driver->symmetric_##name ||	\
397 			      rtd->dai_link->symmetric_##name)) {	\
398 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
399 			#name, soc_dai->name);				\
400 									\
401 		ret = snd_pcm_hw_constraint_single(substream->runtime,	\
402 						   SNDRV_PCM_HW_PARAM_##NAME,\
403 						   soc_dai->name);	\
404 		if (ret < 0) {						\
405 			dev_err(soc_dai->dev,				\
406 				"ASoC: Unable to apply %s constraint: %d\n",\
407 				#name, ret);				\
408 			return ret;					\
409 		}							\
410 	}
411 
412 	__soc_pcm_apply_symmetry(rate,		RATE);
413 	__soc_pcm_apply_symmetry(channels,	CHANNELS);
414 	__soc_pcm_apply_symmetry(sample_bits,	SAMPLE_BITS);
415 
416 	return 0;
417 }
418 
soc_pcm_params_symmetry(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)419 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
420 				struct snd_pcm_hw_params *params)
421 {
422 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
423 	struct snd_soc_dai d;
424 	struct snd_soc_dai *dai;
425 	struct snd_soc_dai *cpu_dai;
426 	unsigned int symmetry, i;
427 
428 	d.name = __func__;
429 	soc_pcm_set_dai_params(&d, params);
430 
431 #define __soc_pcm_params_symmetry(xxx)					\
432 	symmetry = rtd->dai_link->symmetric_##xxx;			\
433 	for_each_rtd_dais(rtd, i, dai)					\
434 		symmetry |= dai->driver->symmetric_##xxx;		\
435 									\
436 	if (symmetry)							\
437 		for_each_rtd_cpu_dais(rtd, i, cpu_dai)			\
438 			if (!snd_soc_dai_is_dummy(cpu_dai) &&		\
439 			    cpu_dai->xxx && cpu_dai->xxx != d.xxx) {	\
440 				dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
441 					#xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
442 				return -EINVAL;				\
443 			}
444 
445 	/* reject unmatched parameters when applying symmetry */
446 	__soc_pcm_params_symmetry(rate);
447 	__soc_pcm_params_symmetry(channels);
448 	__soc_pcm_params_symmetry(sample_bits);
449 
450 	return 0;
451 }
452 
soc_pcm_update_symmetry(struct snd_pcm_substream * substream)453 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
454 {
455 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
456 	struct snd_soc_dai_link *link = rtd->dai_link;
457 	struct snd_soc_dai *dai;
458 	unsigned int symmetry, i;
459 
460 	symmetry = link->symmetric_rate ||
461 		link->symmetric_channels ||
462 		link->symmetric_sample_bits;
463 
464 	for_each_rtd_dais(rtd, i, dai)
465 		symmetry = symmetry ||
466 			dai->driver->symmetric_rate ||
467 			dai->driver->symmetric_channels ||
468 			dai->driver->symmetric_sample_bits;
469 
470 	if (symmetry)
471 		substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
472 }
473 
soc_pcm_set_msb(struct snd_pcm_substream * substream,int bits)474 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
475 {
476 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
477 	int ret;
478 
479 	if (!bits)
480 		return;
481 
482 	ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
483 	if (ret != 0)
484 		dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
485 				 bits, ret);
486 }
487 
soc_pcm_apply_msb(struct snd_pcm_substream * substream)488 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
489 {
490 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
491 	struct snd_soc_dai *cpu_dai;
492 	struct snd_soc_dai *codec_dai;
493 	int stream = substream->stream;
494 	int i;
495 	unsigned int bits = 0, cpu_bits = 0;
496 
497 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
498 		struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
499 
500 		if (pcm_codec->sig_bits == 0) {
501 			bits = 0;
502 			break;
503 		}
504 		bits = max(pcm_codec->sig_bits, bits);
505 	}
506 
507 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
508 		struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
509 
510 		if (pcm_cpu->sig_bits == 0) {
511 			cpu_bits = 0;
512 			break;
513 		}
514 		cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
515 	}
516 
517 	soc_pcm_set_msb(substream, bits);
518 	soc_pcm_set_msb(substream, cpu_bits);
519 }
520 
soc_pcm_hw_init(struct snd_pcm_hardware * hw)521 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
522 {
523 	hw->rates		= UINT_MAX;
524 	hw->rate_min		= 0;
525 	hw->rate_max		= UINT_MAX;
526 	hw->channels_min	= 0;
527 	hw->channels_max	= UINT_MAX;
528 	hw->formats		= ULLONG_MAX;
529 }
530 
soc_pcm_hw_update_rate(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)531 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
532 				   struct snd_soc_pcm_stream *p)
533 {
534 	hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
535 
536 	/* setup hw->rate_min/max via hw->rates first */
537 	snd_pcm_hw_limit_rates(hw);
538 
539 	/* update hw->rate_min/max by snd_soc_pcm_stream */
540 	hw->rate_min = max(hw->rate_min, p->rate_min);
541 	hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
542 }
543 
soc_pcm_hw_update_chan(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)544 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
545 				   struct snd_soc_pcm_stream *p)
546 {
547 	hw->channels_min = max(hw->channels_min, p->channels_min);
548 	hw->channels_max = min(hw->channels_max, p->channels_max);
549 }
550 
soc_pcm_hw_update_format(struct snd_pcm_hardware * hw,struct snd_soc_pcm_stream * p)551 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
552 				     struct snd_soc_pcm_stream *p)
553 {
554 	hw->formats &= p->formats;
555 }
556 
557 /**
558  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
559  * @rtd: ASoC PCM runtime
560  * @hw: PCM hardware parameters (output)
561  * @stream: Direction of the PCM stream
562  *
563  * Calculates the subset of stream parameters supported by all DAIs
564  * associated with the PCM stream.
565  */
snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_hardware * hw,int stream)566 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
567 			    struct snd_pcm_hardware *hw, int stream)
568 {
569 	struct snd_soc_dai *codec_dai;
570 	struct snd_soc_dai *cpu_dai;
571 	struct snd_soc_pcm_stream *codec_stream;
572 	struct snd_soc_pcm_stream *cpu_stream;
573 	unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
574 	int i;
575 
576 	soc_pcm_hw_init(hw);
577 
578 	/* first calculate min/max only for CPUs in the DAI link */
579 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
580 
581 		/*
582 		 * Skip CPUs which don't support the current stream type.
583 		 * Otherwise, since the rate, channel, and format values will
584 		 * zero in that case, we would have no usable settings left,
585 		 * causing the resulting setup to fail.
586 		 */
587 		if (!snd_soc_dai_stream_valid(cpu_dai, stream))
588 			continue;
589 
590 		cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
591 
592 		soc_pcm_hw_update_chan(hw, cpu_stream);
593 		soc_pcm_hw_update_rate(hw, cpu_stream);
594 		soc_pcm_hw_update_format(hw, cpu_stream);
595 	}
596 	cpu_chan_min = hw->channels_min;
597 	cpu_chan_max = hw->channels_max;
598 
599 	/* second calculate min/max only for CODECs in the DAI link */
600 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
601 
602 		/*
603 		 * Skip CODECs which don't support the current stream type.
604 		 * Otherwise, since the rate, channel, and format values will
605 		 * zero in that case, we would have no usable settings left,
606 		 * causing the resulting setup to fail.
607 		 */
608 		if (!snd_soc_dai_stream_valid(codec_dai, stream))
609 			continue;
610 
611 		codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
612 
613 		soc_pcm_hw_update_chan(hw, codec_stream);
614 		soc_pcm_hw_update_rate(hw, codec_stream);
615 		soc_pcm_hw_update_format(hw, codec_stream);
616 	}
617 
618 	/* Verify both a valid CPU DAI and a valid CODEC DAI were found */
619 	if (!hw->channels_min)
620 		return -EINVAL;
621 
622 	/*
623 	 * chan min/max cannot be enforced if there are multiple CODEC DAIs
624 	 * connected to CPU DAI(s), use CPU DAI's directly and let
625 	 * channel allocation be fixed up later
626 	 */
627 	if (rtd->dai_link->num_codecs > 1) {
628 		hw->channels_min = cpu_chan_min;
629 		hw->channels_max = cpu_chan_max;
630 	}
631 
632 	return 0;
633 }
634 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
635 
soc_pcm_init_runtime_hw(struct snd_pcm_substream * substream)636 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
637 {
638 	struct snd_pcm_hardware *hw = &substream->runtime->hw;
639 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
640 	u64 formats = hw->formats;
641 
642 	/*
643 	 * At least one CPU and one CODEC should match. Otherwise, we should
644 	 * have bailed out on a higher level, since there would be no CPU or
645 	 * CODEC to support the transfer direction in that case.
646 	 */
647 	snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
648 
649 	if (formats)
650 		hw->formats &= formats;
651 }
652 
soc_pcm_components_open(struct snd_pcm_substream * substream)653 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
654 {
655 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
656 	struct snd_soc_component *component;
657 	int i, ret = 0;
658 
659 	for_each_rtd_components(rtd, i, component) {
660 		ret = snd_soc_component_module_get_when_open(component, substream);
661 		if (ret < 0)
662 			break;
663 
664 		ret = snd_soc_component_open(component, substream);
665 		if (ret < 0)
666 			break;
667 	}
668 
669 	return ret;
670 }
671 
soc_pcm_components_close(struct snd_pcm_substream * substream,int rollback)672 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
673 				    int rollback)
674 {
675 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
676 	struct snd_soc_component *component;
677 	int i, ret = 0;
678 
679 	for_each_rtd_components(rtd, i, component) {
680 		int r = snd_soc_component_close(component, substream, rollback);
681 		if (r < 0)
682 			ret = r; /* use last ret */
683 
684 		snd_soc_component_module_put_when_close(component, substream, rollback);
685 	}
686 
687 	return ret;
688 }
689 
soc_pcm_clean(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,int rollback)690 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
691 			 struct snd_pcm_substream *substream, int rollback)
692 {
693 	struct snd_soc_component *component;
694 	struct snd_soc_dai *dai;
695 	int i;
696 
697 	snd_soc_dpcm_mutex_assert_held(rtd);
698 
699 	if (!rollback) {
700 		snd_soc_runtime_deactivate(rtd, substream->stream);
701 
702 		/* Make sure DAI parameters cleared if the DAI becomes inactive */
703 		for_each_rtd_dais(rtd, i, dai)
704 			if (snd_soc_dai_active(dai) == 0 &&
705 			    (dai->rate || dai->channels || dai->sample_bits))
706 				soc_pcm_set_dai_params(dai, NULL);
707 	}
708 
709 	for_each_rtd_dais(rtd, i, dai)
710 		snd_soc_dai_shutdown(dai, substream, rollback);
711 
712 	snd_soc_link_shutdown(substream, rollback);
713 
714 	soc_pcm_components_close(substream, rollback);
715 
716 	snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
717 
718 	for_each_rtd_components(rtd, i, component)
719 		if (!snd_soc_component_active(component))
720 			pinctrl_pm_select_sleep_state(component->dev);
721 
722 	return 0;
723 }
724 
725 /*
726  * Called by ALSA when a PCM substream is closed. Private data can be
727  * freed here. The cpu DAI, codec DAI, machine and components are also
728  * shutdown.
729  */
__soc_pcm_close(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)730 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
731 			   struct snd_pcm_substream *substream)
732 {
733 	return soc_pcm_clean(rtd, substream, 0);
734 }
735 
736 /* PCM close ops for non-DPCM streams */
soc_pcm_close(struct snd_pcm_substream * substream)737 static int soc_pcm_close(struct snd_pcm_substream *substream)
738 {
739 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
740 
741 	snd_soc_dpcm_mutex_lock(rtd);
742 	__soc_pcm_close(rtd, substream);
743 	snd_soc_dpcm_mutex_unlock(rtd);
744 	return 0;
745 }
746 
soc_hw_sanity_check(struct snd_pcm_substream * substream)747 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
748 {
749 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
750 	struct snd_pcm_hardware *hw = &substream->runtime->hw;
751 	const char *name_cpu = soc_cpu_dai_name(rtd);
752 	const char *name_codec = soc_codec_dai_name(rtd);
753 	const char *err_msg;
754 	struct device *dev = rtd->dev;
755 
756 	err_msg = "rates";
757 	if (!hw->rates)
758 		goto config_err;
759 
760 	err_msg = "formats";
761 	if (!hw->formats)
762 		goto config_err;
763 
764 	err_msg = "channels";
765 	if (!hw->channels_min || !hw->channels_max ||
766 	     hw->channels_min  >  hw->channels_max)
767 		goto config_err;
768 
769 	dev_dbg(dev, "ASoC: %s <-> %s info:\n",		name_codec,
770 							name_cpu);
771 	dev_dbg(dev, "ASoC: rate mask 0x%x\n",		hw->rates);
772 	dev_dbg(dev, "ASoC: ch   min %d max %d\n",	hw->channels_min,
773 							hw->channels_max);
774 	dev_dbg(dev, "ASoC: rate min %d max %d\n",	hw->rate_min,
775 							hw->rate_max);
776 
777 	return 0;
778 
779 config_err:
780 	dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
781 		name_codec, name_cpu, err_msg);
782 	return -EINVAL;
783 }
784 
785 /*
786  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
787  * then initialized and any private data can be allocated. This also calls
788  * startup for the cpu DAI, component, machine and codec DAI.
789  */
__soc_pcm_open(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)790 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
791 			  struct snd_pcm_substream *substream)
792 {
793 	struct snd_soc_component *component;
794 	struct snd_soc_dai *dai;
795 	int i, ret = 0;
796 
797 	snd_soc_dpcm_mutex_assert_held(rtd);
798 
799 	for_each_rtd_components(rtd, i, component)
800 		pinctrl_pm_select_default_state(component->dev);
801 
802 	ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
803 	if (ret < 0)
804 		goto err;
805 
806 	ret = soc_pcm_components_open(substream);
807 	if (ret < 0)
808 		goto err;
809 
810 	ret = snd_soc_link_startup(substream);
811 	if (ret < 0)
812 		goto err;
813 
814 	/* startup the audio subsystem */
815 	for_each_rtd_dais(rtd, i, dai) {
816 		ret = snd_soc_dai_startup(dai, substream);
817 		if (ret < 0)
818 			goto err;
819 	}
820 
821 	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
822 	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
823 		goto dynamic;
824 
825 	/* Check that the codec and cpu DAIs are compatible */
826 	soc_pcm_init_runtime_hw(substream);
827 
828 	soc_pcm_update_symmetry(substream);
829 
830 	ret = soc_hw_sanity_check(substream);
831 	if (ret < 0)
832 		goto err;
833 
834 	soc_pcm_apply_msb(substream);
835 
836 	/* Symmetry only applies if we've already got an active stream. */
837 	for_each_rtd_dais(rtd, i, dai) {
838 		ret = soc_pcm_apply_symmetry(substream, dai);
839 		if (ret != 0)
840 			goto err;
841 	}
842 dynamic:
843 	snd_soc_runtime_activate(rtd, substream->stream);
844 	ret = 0;
845 err:
846 	if (ret < 0)
847 		soc_pcm_clean(rtd, substream, 1);
848 
849 	return soc_pcm_ret(rtd, ret);
850 }
851 
852 /* PCM open ops for non-DPCM streams */
soc_pcm_open(struct snd_pcm_substream * substream)853 static int soc_pcm_open(struct snd_pcm_substream *substream)
854 {
855 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
856 	int ret;
857 
858 	snd_soc_dpcm_mutex_lock(rtd);
859 	ret = __soc_pcm_open(rtd, substream);
860 	snd_soc_dpcm_mutex_unlock(rtd);
861 	return ret;
862 }
863 
864 /*
865  * Called by ALSA when the PCM substream is prepared, can set format, sample
866  * rate, etc.  This function is non atomic and can be called multiple times,
867  * it can refer to the runtime info.
868  */
__soc_pcm_prepare(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)869 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
870 			     struct snd_pcm_substream *substream)
871 {
872 	struct snd_soc_dai *dai;
873 	int i, ret = 0;
874 
875 	snd_soc_dpcm_mutex_assert_held(rtd);
876 
877 	ret = snd_soc_link_prepare(substream);
878 	if (ret < 0)
879 		goto out;
880 
881 	ret = snd_soc_pcm_component_prepare(substream);
882 	if (ret < 0)
883 		goto out;
884 
885 	ret = snd_soc_pcm_dai_prepare(substream);
886 	if (ret < 0)
887 		goto out;
888 
889 	/* cancel any delayed stream shutdown that is pending */
890 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
891 	    rtd->pop_wait) {
892 		rtd->pop_wait = 0;
893 		cancel_delayed_work(&rtd->delayed_work);
894 	}
895 
896 	snd_soc_dapm_stream_event(rtd, substream->stream,
897 			SND_SOC_DAPM_STREAM_START);
898 
899 	for_each_rtd_dais(rtd, i, dai) {
900 		if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
901 			snd_soc_dai_digital_mute(dai, 0, substream->stream);
902 	}
903 
904 out:
905 	return soc_pcm_ret(rtd, ret);
906 }
907 
908 /* PCM prepare ops for non-DPCM streams */
soc_pcm_prepare(struct snd_pcm_substream * substream)909 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
910 {
911 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
912 	int ret;
913 
914 	snd_soc_dpcm_mutex_lock(rtd);
915 	ret = __soc_pcm_prepare(rtd, substream);
916 	snd_soc_dpcm_mutex_unlock(rtd);
917 	return ret;
918 }
919 
soc_pcm_codec_params_fixup(struct snd_pcm_hw_params * params,unsigned int mask)920 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
921 				       unsigned int mask)
922 {
923 	struct snd_interval *interval;
924 	int channels = hweight_long(mask);
925 
926 	interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
927 	interval->min = channels;
928 	interval->max = channels;
929 }
930 
soc_pcm_hw_clean(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,int rollback)931 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
932 			    struct snd_pcm_substream *substream, int rollback)
933 {
934 	struct snd_soc_dai *dai;
935 	int i;
936 
937 	snd_soc_dpcm_mutex_assert_held(rtd);
938 
939 	/* clear the corresponding DAIs parameters when going to be inactive */
940 	for_each_rtd_dais(rtd, i, dai) {
941 		if (snd_soc_dai_active(dai) == 1)
942 			soc_pcm_set_dai_params(dai, NULL);
943 
944 		if (snd_soc_dai_stream_active(dai, substream->stream) == 1) {
945 			if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
946 				snd_soc_dai_digital_mute(dai, 1, substream->stream);
947 		}
948 	}
949 
950 	/* run the stream event */
951 	snd_soc_dapm_stream_stop(rtd, substream->stream);
952 
953 	/* free any machine hw params */
954 	snd_soc_link_hw_free(substream, rollback);
955 
956 	/* free any component resources */
957 	snd_soc_pcm_component_hw_free(substream, rollback);
958 
959 	/* now free hw params for the DAIs  */
960 	for_each_rtd_dais(rtd, i, dai)
961 		if (snd_soc_dai_stream_valid(dai, substream->stream))
962 			snd_soc_dai_hw_free(dai, substream, rollback);
963 
964 	return 0;
965 }
966 
967 /*
968  * Frees resources allocated by hw_params, can be called multiple times
969  */
__soc_pcm_hw_free(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)970 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
971 			     struct snd_pcm_substream *substream)
972 {
973 	return soc_pcm_hw_clean(rtd, substream, 0);
974 }
975 
976 /* hw_free PCM ops for non-DPCM streams */
soc_pcm_hw_free(struct snd_pcm_substream * substream)977 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
978 {
979 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
980 	int ret;
981 
982 	snd_soc_dpcm_mutex_lock(rtd);
983 	ret = __soc_pcm_hw_free(rtd, substream);
984 	snd_soc_dpcm_mutex_unlock(rtd);
985 	return ret;
986 }
987 
988 /*
989  * Called by ALSA when the hardware params are set by application. This
990  * function can also be called multiple times and can allocate buffers
991  * (using snd_pcm_lib_* ). It's non-atomic.
992  */
__soc_pcm_hw_params(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)993 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
994 			       struct snd_pcm_substream *substream,
995 			       struct snd_pcm_hw_params *params)
996 {
997 	struct snd_soc_dai *cpu_dai;
998 	struct snd_soc_dai *codec_dai;
999 	struct snd_pcm_hw_params tmp_params;
1000 	int i, ret = 0;
1001 
1002 	snd_soc_dpcm_mutex_assert_held(rtd);
1003 
1004 	ret = soc_pcm_params_symmetry(substream, params);
1005 	if (ret)
1006 		goto out;
1007 
1008 	ret = snd_soc_link_hw_params(substream, params);
1009 	if (ret < 0)
1010 		goto out;
1011 
1012 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
1013 		unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1014 
1015 		/*
1016 		 * Skip CODECs which don't support the current stream type,
1017 		 * the idea being that if a CODEC is not used for the currently
1018 		 * set up transfer direction, it should not need to be
1019 		 * configured, especially since the configuration used might
1020 		 * not even be supported by that CODEC. There may be cases
1021 		 * however where a CODEC needs to be set up although it is
1022 		 * actually not being used for the transfer, e.g. if a
1023 		 * capture-only CODEC is acting as an LRCLK and/or BCLK master
1024 		 * for the DAI link including a playback-only CODEC.
1025 		 * If this becomes necessary, we will have to augment the
1026 		 * machine driver setup with information on how to act, so
1027 		 * we can do the right thing here.
1028 		 */
1029 		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1030 			continue;
1031 
1032 		/* copy params for each codec */
1033 		tmp_params = *params;
1034 
1035 		/* fixup params based on TDM slot masks */
1036 		if (tdm_mask)
1037 			soc_pcm_codec_params_fixup(&tmp_params, tdm_mask);
1038 
1039 		ret = snd_soc_dai_hw_params(codec_dai, substream,
1040 					    &tmp_params);
1041 		if(ret < 0)
1042 			goto out;
1043 
1044 		soc_pcm_set_dai_params(codec_dai, &tmp_params);
1045 		snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai);
1046 	}
1047 
1048 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1049 		unsigned int ch_mask = 0;
1050 		int j;
1051 
1052 		/*
1053 		 * Skip CPUs which don't support the current stream
1054 		 * type. See soc_pcm_init_runtime_hw() for more details
1055 		 */
1056 		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1057 			continue;
1058 
1059 		/* copy params for each cpu */
1060 		tmp_params = *params;
1061 
1062 		if (!rtd->dai_link->codec_ch_maps)
1063 			goto hw_params;
1064 		/*
1065 		 * construct cpu channel mask by combining ch_mask of each
1066 		 * codec which maps to the cpu.
1067 		 */
1068 		for_each_rtd_codec_dais(rtd, j, codec_dai) {
1069 			if (rtd->dai_link->codec_ch_maps[j].connected_cpu_id == i)
1070 				ch_mask |= rtd->dai_link->codec_ch_maps[j].ch_mask;
1071 		}
1072 
1073 		/* fixup cpu channel number */
1074 		if (ch_mask)
1075 			soc_pcm_codec_params_fixup(&tmp_params, ch_mask);
1076 
1077 hw_params:
1078 		ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params);
1079 		if (ret < 0)
1080 			goto out;
1081 
1082 		/* store the parameters for each DAI */
1083 		soc_pcm_set_dai_params(cpu_dai, &tmp_params);
1084 		snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai);
1085 	}
1086 
1087 	ret = snd_soc_pcm_component_hw_params(substream, params);
1088 out:
1089 	if (ret < 0)
1090 		soc_pcm_hw_clean(rtd, substream, 1);
1091 
1092 	return soc_pcm_ret(rtd, ret);
1093 }
1094 
1095 /* hw_params PCM ops for non-DPCM streams */
soc_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)1096 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1097 			     struct snd_pcm_hw_params *params)
1098 {
1099 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1100 	int ret;
1101 
1102 	snd_soc_dpcm_mutex_lock(rtd);
1103 	ret = __soc_pcm_hw_params(rtd, substream, params);
1104 	snd_soc_dpcm_mutex_unlock(rtd);
1105 	return ret;
1106 }
1107 
1108 #define TRIGGER_MAX 3
1109 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = {
1110 	[SND_SOC_TRIGGER_ORDER_DEFAULT] = {
1111 		snd_soc_link_trigger,
1112 		snd_soc_pcm_component_trigger,
1113 		snd_soc_pcm_dai_trigger,
1114 	},
1115 	[SND_SOC_TRIGGER_ORDER_LDC] = {
1116 		snd_soc_link_trigger,
1117 		snd_soc_pcm_dai_trigger,
1118 		snd_soc_pcm_component_trigger,
1119 	},
1120 };
1121 
soc_pcm_trigger(struct snd_pcm_substream * substream,int cmd)1122 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1123 {
1124 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
1125 	struct snd_soc_component *component;
1126 	int ret = 0, r = 0, i;
1127 	int rollback = 0;
1128 	int start = 0, stop = 0;
1129 
1130 	/*
1131 	 * select START/STOP sequence
1132 	 */
1133 	for_each_rtd_components(rtd, i, component) {
1134 		if (component->driver->trigger_start)
1135 			start = component->driver->trigger_start;
1136 		if (component->driver->trigger_stop)
1137 			stop = component->driver->trigger_stop;
1138 	}
1139 	if (rtd->dai_link->trigger_start)
1140 		start = rtd->dai_link->trigger_start;
1141 	if (rtd->dai_link->trigger_stop)
1142 		stop  = rtd->dai_link->trigger_stop;
1143 
1144 	if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX ||
1145 	    stop  < 0 || stop  >= SND_SOC_TRIGGER_ORDER_MAX)
1146 		return -EINVAL;
1147 
1148 	/*
1149 	 * START
1150 	 */
1151 	switch (cmd) {
1152 	case SNDRV_PCM_TRIGGER_START:
1153 	case SNDRV_PCM_TRIGGER_RESUME:
1154 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1155 		for (i = 0; i < TRIGGER_MAX; i++) {
1156 			r = trigger[start][i](substream, cmd, 0);
1157 			if (r < 0)
1158 				break;
1159 		}
1160 	}
1161 
1162 	/*
1163 	 * Rollback if START failed
1164 	 * find correspond STOP command
1165 	 */
1166 	if (r < 0) {
1167 		rollback = 1;
1168 		ret = r;
1169 		switch (cmd) {
1170 		case SNDRV_PCM_TRIGGER_START:
1171 			cmd = SNDRV_PCM_TRIGGER_STOP;
1172 			break;
1173 		case SNDRV_PCM_TRIGGER_RESUME:
1174 			cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1175 			break;
1176 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1177 			cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1178 			break;
1179 		}
1180 	}
1181 
1182 	/*
1183 	 * STOP
1184 	 */
1185 	switch (cmd) {
1186 	case SNDRV_PCM_TRIGGER_STOP:
1187 	case SNDRV_PCM_TRIGGER_SUSPEND:
1188 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1189 		for (i = TRIGGER_MAX; i > 0; i--) {
1190 			r = trigger[stop][i - 1](substream, cmd, rollback);
1191 			if (r < 0)
1192 				ret = r;
1193 		}
1194 	}
1195 
1196 	return ret;
1197 }
1198 
1199 /*
1200  * soc level wrapper for pointer callback
1201  * If cpu_dai, codec_dai, component driver has the delay callback, then
1202  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1203  */
soc_pcm_pointer(struct snd_pcm_substream * substream)1204 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1205 {
1206 	struct snd_pcm_runtime *runtime = substream->runtime;
1207 	snd_pcm_uframes_t offset = 0;
1208 	snd_pcm_sframes_t codec_delay = 0;
1209 	snd_pcm_sframes_t cpu_delay = 0;
1210 
1211 	offset = snd_soc_pcm_component_pointer(substream);
1212 
1213 	/* should be called *after* snd_soc_pcm_component_pointer() */
1214 	snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1215 	snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1216 
1217 	runtime->delay = cpu_delay + codec_delay;
1218 
1219 	return offset;
1220 }
1221 
1222 /* connect a FE and BE */
dpcm_be_connect(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1223 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1224 		struct snd_soc_pcm_runtime *be, int stream)
1225 {
1226 	struct snd_pcm_substream *fe_substream;
1227 	struct snd_pcm_substream *be_substream;
1228 	struct snd_soc_dpcm *dpcm;
1229 
1230 	snd_soc_dpcm_mutex_assert_held(fe);
1231 
1232 	/* only add new dpcms */
1233 	for_each_dpcm_be(fe, stream, dpcm) {
1234 		if (dpcm->be == be && dpcm->fe == fe)
1235 			return 0;
1236 	}
1237 
1238 	fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1239 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1240 
1241 	if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1242 		dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1243 			__func__);
1244 		return -EINVAL;
1245 	}
1246 	if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1247 		dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1248 		be_substream->pcm->nonatomic = 1;
1249 	}
1250 
1251 	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1252 	if (!dpcm)
1253 		return -ENOMEM;
1254 
1255 	dpcm->be = be;
1256 	dpcm->fe = fe;
1257 	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1258 	snd_soc_dpcm_stream_lock_irq(fe, stream);
1259 	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1260 	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1261 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
1262 
1263 	dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1264 			stream ? "capture" : "playback",  fe->dai_link->name,
1265 			stream ? "<-" : "->", be->dai_link->name);
1266 
1267 	dpcm_create_debugfs_state(dpcm, stream);
1268 
1269 	return 1;
1270 }
1271 
1272 /* reparent a BE onto another FE */
dpcm_be_reparent(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)1273 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1274 			struct snd_soc_pcm_runtime *be, int stream)
1275 {
1276 	struct snd_soc_dpcm *dpcm;
1277 	struct snd_pcm_substream *fe_substream, *be_substream;
1278 
1279 	/* reparent if BE is connected to other FEs */
1280 	if (!be->dpcm[stream].users)
1281 		return;
1282 
1283 	be_substream = snd_soc_dpcm_get_substream(be, stream);
1284 	if (!be_substream)
1285 		return;
1286 
1287 	for_each_dpcm_fe(be, stream, dpcm) {
1288 		if (dpcm->fe == fe)
1289 			continue;
1290 
1291 		dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1292 			stream ? "capture" : "playback",
1293 			dpcm->fe->dai_link->name,
1294 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1295 
1296 		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1297 		be_substream->runtime = fe_substream->runtime;
1298 		break;
1299 	}
1300 }
1301 
1302 /* disconnect a BE and FE */
dpcm_be_disconnect(struct snd_soc_pcm_runtime * fe,int stream)1303 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1304 {
1305 	struct snd_soc_dpcm *dpcm, *d;
1306 	LIST_HEAD(deleted_dpcms);
1307 
1308 	snd_soc_dpcm_mutex_assert_held(fe);
1309 
1310 	snd_soc_dpcm_stream_lock_irq(fe, stream);
1311 	for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1312 		dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1313 				stream ? "capture" : "playback",
1314 				dpcm->be->dai_link->name);
1315 
1316 		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1317 			continue;
1318 
1319 		dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1320 			stream ? "capture" : "playback", fe->dai_link->name,
1321 			stream ? "<-" : "->", dpcm->be->dai_link->name);
1322 
1323 		/* BEs still alive need new FE */
1324 		dpcm_be_reparent(fe, dpcm->be, stream);
1325 
1326 		list_del(&dpcm->list_be);
1327 		list_move(&dpcm->list_fe, &deleted_dpcms);
1328 	}
1329 	snd_soc_dpcm_stream_unlock_irq(fe, stream);
1330 
1331 	while (!list_empty(&deleted_dpcms)) {
1332 		dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1333 					list_fe);
1334 		list_del(&dpcm->list_fe);
1335 		dpcm_remove_debugfs_state(dpcm);
1336 		kfree(dpcm);
1337 	}
1338 }
1339 
1340 /* get BE for DAI widget and stream */
dpcm_get_be(struct snd_soc_card * card,struct snd_soc_dapm_widget * widget,int stream)1341 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1342 		struct snd_soc_dapm_widget *widget, int stream)
1343 {
1344 	struct snd_soc_pcm_runtime *be;
1345 	struct snd_soc_dapm_widget *w;
1346 	struct snd_soc_dai *dai;
1347 	int i;
1348 
1349 	dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1350 
1351 	for_each_card_rtds(card, be) {
1352 
1353 		if (!be->dai_link->no_pcm)
1354 			continue;
1355 
1356 		if (!snd_soc_dpcm_get_substream(be, stream))
1357 			continue;
1358 
1359 		for_each_rtd_dais(be, i, dai) {
1360 			w = snd_soc_dai_get_widget(dai, stream);
1361 
1362 			dev_dbg(card->dev, "ASoC: try BE : %s\n",
1363 				w ? w->name : "(not set)");
1364 
1365 			if (w == widget)
1366 				return be;
1367 		}
1368 	}
1369 
1370 	/* Widget provided is not a BE */
1371 	return NULL;
1372 }
1373 
widget_in_list(struct snd_soc_dapm_widget_list * list,struct snd_soc_dapm_widget * widget)1374 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1375 		struct snd_soc_dapm_widget *widget)
1376 {
1377 	struct snd_soc_dapm_widget *w;
1378 	int i;
1379 
1380 	for_each_dapm_widgets(list, i, w)
1381 		if (widget == w)
1382 			return 1;
1383 
1384 	return 0;
1385 }
1386 EXPORT_SYMBOL_GPL(widget_in_list);
1387 
dpcm_end_walk_at_be(struct snd_soc_dapm_widget * widget,enum snd_soc_dapm_direction dir)1388 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1389 {
1390 	struct snd_soc_card *card = widget->dapm->card;
1391 	struct snd_soc_pcm_runtime *rtd;
1392 	int stream;
1393 
1394 	/* adjust dir to stream */
1395 	if (dir == SND_SOC_DAPM_DIR_OUT)
1396 		stream = SNDRV_PCM_STREAM_PLAYBACK;
1397 	else
1398 		stream = SNDRV_PCM_STREAM_CAPTURE;
1399 
1400 	rtd = dpcm_get_be(card, widget, stream);
1401 	if (rtd)
1402 		return true;
1403 
1404 	return false;
1405 }
1406 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1407 
dpcm_path_get(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list)1408 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1409 	int stream, struct snd_soc_dapm_widget_list **list)
1410 {
1411 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
1412 	int paths;
1413 
1414 	if (fe->dai_link->num_cpus > 1) {
1415 		dev_err(fe->dev,
1416 			"%s doesn't support Multi CPU yet\n", __func__);
1417 		return -EINVAL;
1418 	}
1419 
1420 	/* get number of valid DAI paths and their widgets */
1421 	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1422 			fe->card->component_chaining ?
1423 				NULL : dpcm_end_walk_at_be);
1424 
1425 	if (paths > 0)
1426 		dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1427 			stream ? "capture" : "playback");
1428 	else if (paths == 0)
1429 		dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1430 			 stream ? "capture" : "playback");
1431 
1432 	return paths;
1433 }
1434 
dpcm_path_put(struct snd_soc_dapm_widget_list ** list)1435 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1436 {
1437 	snd_soc_dapm_dai_free_widgets(list);
1438 }
1439 
dpcm_be_is_active(struct snd_soc_dpcm * dpcm,int stream,struct snd_soc_dapm_widget_list * list)1440 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1441 			      struct snd_soc_dapm_widget_list *list)
1442 {
1443 	struct snd_soc_dai *dai;
1444 	unsigned int i;
1445 
1446 	/* is there a valid DAI widget for this BE */
1447 	for_each_rtd_dais(dpcm->be, i, dai) {
1448 		struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1449 
1450 		/*
1451 		 * The BE is pruned only if none of the dai
1452 		 * widgets are in the active list.
1453 		 */
1454 		if (widget && widget_in_list(list, widget))
1455 			return true;
1456 	}
1457 
1458 	return false;
1459 }
1460 
dpcm_prune_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1461 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1462 			    struct snd_soc_dapm_widget_list **list_)
1463 {
1464 	struct snd_soc_dpcm *dpcm;
1465 	int prune = 0;
1466 
1467 	/* Destroy any old FE <--> BE connections */
1468 	for_each_dpcm_be(fe, stream, dpcm) {
1469 		if (dpcm_be_is_active(dpcm, stream, *list_))
1470 			continue;
1471 
1472 		dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1473 			stream ? "capture" : "playback",
1474 			dpcm->be->dai_link->name, fe->dai_link->name);
1475 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1476 		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1477 		prune++;
1478 	}
1479 
1480 	dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1481 	return prune;
1482 }
1483 
dpcm_add_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list_)1484 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1485 	struct snd_soc_dapm_widget_list **list_)
1486 {
1487 	struct snd_soc_card *card = fe->card;
1488 	struct snd_soc_dapm_widget_list *list = *list_;
1489 	struct snd_soc_pcm_runtime *be;
1490 	struct snd_soc_dapm_widget *widget;
1491 	struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1492 	int i, new = 0, err;
1493 
1494 	/* don't connect if FE is not running */
1495 	if (!fe_substream->runtime && !fe->fe_compr)
1496 		return new;
1497 
1498 	/* Create any new FE <--> BE connections */
1499 	for_each_dapm_widgets(list, i, widget) {
1500 
1501 		switch (widget->id) {
1502 		case snd_soc_dapm_dai_in:
1503 			if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1504 				continue;
1505 			break;
1506 		case snd_soc_dapm_dai_out:
1507 			if (stream != SNDRV_PCM_STREAM_CAPTURE)
1508 				continue;
1509 			break;
1510 		default:
1511 			continue;
1512 		}
1513 
1514 		/* is there a valid BE rtd for this widget */
1515 		be = dpcm_get_be(card, widget, stream);
1516 		if (!be) {
1517 			dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1518 				widget->name);
1519 			continue;
1520 		}
1521 
1522 		/*
1523 		 * Filter for systems with 'component_chaining' enabled.
1524 		 * This helps to avoid unnecessary re-configuration of an
1525 		 * already active BE on such systems.
1526 		 */
1527 		if (fe->card->component_chaining &&
1528 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1529 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1530 			continue;
1531 
1532 		/* newly connected FE and BE */
1533 		err = dpcm_be_connect(fe, be, stream);
1534 		if (err < 0) {
1535 			dev_err(fe->dev, "ASoC: can't connect %s\n",
1536 				widget->name);
1537 			break;
1538 		} else if (err == 0) /* already connected */
1539 			continue;
1540 
1541 		/* new */
1542 		dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1543 		new++;
1544 	}
1545 
1546 	dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1547 	return new;
1548 }
1549 
1550 /*
1551  * Find the corresponding BE DAIs that source or sink audio to this
1552  * FE substream.
1553  */
dpcm_process_paths(struct snd_soc_pcm_runtime * fe,int stream,struct snd_soc_dapm_widget_list ** list,int new)1554 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1555 	int stream, struct snd_soc_dapm_widget_list **list, int new)
1556 {
1557 	if (new)
1558 		return dpcm_add_paths(fe, stream, list);
1559 	else
1560 		return dpcm_prune_paths(fe, stream, list);
1561 }
1562 
dpcm_clear_pending_state(struct snd_soc_pcm_runtime * fe,int stream)1563 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1564 {
1565 	struct snd_soc_dpcm *dpcm;
1566 
1567 	for_each_dpcm_be(fe, stream, dpcm)
1568 		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1569 }
1570 
dpcm_be_dai_stop(struct snd_soc_pcm_runtime * fe,int stream,int do_hw_free,struct snd_soc_dpcm * last)1571 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1572 		      int do_hw_free, struct snd_soc_dpcm *last)
1573 {
1574 	struct snd_soc_dpcm *dpcm;
1575 
1576 	/* disable any enabled and non active backends */
1577 	for_each_dpcm_be(fe, stream, dpcm) {
1578 		struct snd_soc_pcm_runtime *be = dpcm->be;
1579 		struct snd_pcm_substream *be_substream =
1580 			snd_soc_dpcm_get_substream(be, stream);
1581 
1582 		if (dpcm == last)
1583 			return;
1584 
1585 		/* is this op for this BE ? */
1586 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1587 			continue;
1588 
1589 		if (be->dpcm[stream].users == 0) {
1590 			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1591 				stream ? "capture" : "playback",
1592 				be->dpcm[stream].state);
1593 			continue;
1594 		}
1595 
1596 		if (--be->dpcm[stream].users != 0)
1597 			continue;
1598 
1599 		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1600 			if (!do_hw_free)
1601 				continue;
1602 
1603 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1604 				__soc_pcm_hw_free(be, be_substream);
1605 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1606 			}
1607 		}
1608 
1609 		__soc_pcm_close(be, be_substream);
1610 		be_substream->runtime = NULL;
1611 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1612 	}
1613 }
1614 
dpcm_be_dai_startup(struct snd_soc_pcm_runtime * fe,int stream)1615 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1616 {
1617 	struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1618 	struct snd_soc_pcm_runtime *be;
1619 	struct snd_soc_dpcm *dpcm;
1620 	int err, count = 0;
1621 
1622 	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
1623 	for_each_dpcm_be(fe, stream, dpcm) {
1624 		struct snd_pcm_substream *be_substream;
1625 
1626 		be = dpcm->be;
1627 		be_substream = snd_soc_dpcm_get_substream(be, stream);
1628 
1629 		if (!be_substream) {
1630 			dev_err(be->dev, "ASoC: no backend %s stream\n",
1631 				stream ? "capture" : "playback");
1632 			continue;
1633 		}
1634 
1635 		/* is this op for this BE ? */
1636 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1637 			continue;
1638 
1639 		/* first time the dpcm is open ? */
1640 		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1641 			dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1642 				stream ? "capture" : "playback",
1643 				be->dpcm[stream].state);
1644 			continue;
1645 		}
1646 
1647 		if (be->dpcm[stream].users++ != 0)
1648 			continue;
1649 
1650 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1651 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1652 			continue;
1653 
1654 		dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1655 			stream ? "capture" : "playback", be->dai_link->name);
1656 
1657 		be_substream->runtime = fe_substream->runtime;
1658 		err = __soc_pcm_open(be, be_substream);
1659 		if (err < 0) {
1660 			be->dpcm[stream].users--;
1661 			if (be->dpcm[stream].users < 0)
1662 				dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1663 					stream ? "capture" : "playback",
1664 					be->dpcm[stream].state);
1665 
1666 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1667 			goto unwind;
1668 		}
1669 		be->dpcm[stream].be_start = 0;
1670 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1671 		count++;
1672 	}
1673 
1674 	return count;
1675 
1676 unwind:
1677 	dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1678 
1679 	return soc_pcm_ret(fe, err);
1680 }
1681 
dpcm_runtime_setup_fe(struct snd_pcm_substream * substream)1682 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1683 {
1684 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1685 	struct snd_pcm_runtime *runtime = substream->runtime;
1686 	struct snd_pcm_hardware *hw = &runtime->hw;
1687 	struct snd_soc_dai *dai;
1688 	int stream = substream->stream;
1689 	u64 formats = hw->formats;
1690 	int i;
1691 
1692 	soc_pcm_hw_init(hw);
1693 
1694 	if (formats)
1695 		hw->formats &= formats;
1696 
1697 	for_each_rtd_cpu_dais(fe, i, dai) {
1698 		struct snd_soc_pcm_stream *cpu_stream;
1699 
1700 		/*
1701 		 * Skip CPUs which don't support the current stream
1702 		 * type. See soc_pcm_init_runtime_hw() for more details
1703 		 */
1704 		if (!snd_soc_dai_stream_valid(dai, stream))
1705 			continue;
1706 
1707 		cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1708 
1709 		soc_pcm_hw_update_rate(hw, cpu_stream);
1710 		soc_pcm_hw_update_chan(hw, cpu_stream);
1711 		soc_pcm_hw_update_format(hw, cpu_stream);
1712 	}
1713 
1714 }
1715 
dpcm_runtime_setup_be_format(struct snd_pcm_substream * substream)1716 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1717 {
1718 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1719 	struct snd_pcm_runtime *runtime = substream->runtime;
1720 	struct snd_pcm_hardware *hw = &runtime->hw;
1721 	struct snd_soc_dpcm *dpcm;
1722 	struct snd_soc_dai *dai;
1723 	int stream = substream->stream;
1724 
1725 	if (!fe->dai_link->dpcm_merged_format)
1726 		return;
1727 
1728 	/*
1729 	 * It returns merged BE codec format
1730 	 * if FE want to use it (= dpcm_merged_format)
1731 	 */
1732 
1733 	for_each_dpcm_be(fe, stream, dpcm) {
1734 		struct snd_soc_pcm_runtime *be = dpcm->be;
1735 		struct snd_soc_pcm_stream *codec_stream;
1736 		int i;
1737 
1738 		for_each_rtd_codec_dais(be, i, dai) {
1739 			/*
1740 			 * Skip CODECs which don't support the current stream
1741 			 * type. See soc_pcm_init_runtime_hw() for more details
1742 			 */
1743 			if (!snd_soc_dai_stream_valid(dai, stream))
1744 				continue;
1745 
1746 			codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1747 
1748 			soc_pcm_hw_update_format(hw, codec_stream);
1749 		}
1750 	}
1751 }
1752 
dpcm_runtime_setup_be_chan(struct snd_pcm_substream * substream)1753 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1754 {
1755 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1756 	struct snd_pcm_runtime *runtime = substream->runtime;
1757 	struct snd_pcm_hardware *hw = &runtime->hw;
1758 	struct snd_soc_dpcm *dpcm;
1759 	int stream = substream->stream;
1760 
1761 	if (!fe->dai_link->dpcm_merged_chan)
1762 		return;
1763 
1764 	/*
1765 	 * It returns merged BE codec channel;
1766 	 * if FE want to use it (= dpcm_merged_chan)
1767 	 */
1768 
1769 	for_each_dpcm_be(fe, stream, dpcm) {
1770 		struct snd_soc_pcm_runtime *be = dpcm->be;
1771 		struct snd_soc_pcm_stream *cpu_stream;
1772 		struct snd_soc_dai *dai;
1773 		int i;
1774 
1775 		for_each_rtd_cpu_dais(be, i, dai) {
1776 			/*
1777 			 * Skip CPUs which don't support the current stream
1778 			 * type. See soc_pcm_init_runtime_hw() for more details
1779 			 */
1780 			if (!snd_soc_dai_stream_valid(dai, stream))
1781 				continue;
1782 
1783 			cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1784 
1785 			soc_pcm_hw_update_chan(hw, cpu_stream);
1786 		}
1787 
1788 		/*
1789 		 * chan min/max cannot be enforced if there are multiple CODEC
1790 		 * DAIs connected to a single CPU DAI, use CPU DAI's directly
1791 		 */
1792 		if (be->dai_link->num_codecs == 1) {
1793 			struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1794 				asoc_rtd_to_codec(be, 0), stream);
1795 
1796 			soc_pcm_hw_update_chan(hw, codec_stream);
1797 		}
1798 	}
1799 }
1800 
dpcm_runtime_setup_be_rate(struct snd_pcm_substream * substream)1801 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1802 {
1803 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1804 	struct snd_pcm_runtime *runtime = substream->runtime;
1805 	struct snd_pcm_hardware *hw = &runtime->hw;
1806 	struct snd_soc_dpcm *dpcm;
1807 	int stream = substream->stream;
1808 
1809 	if (!fe->dai_link->dpcm_merged_rate)
1810 		return;
1811 
1812 	/*
1813 	 * It returns merged BE codec channel;
1814 	 * if FE want to use it (= dpcm_merged_chan)
1815 	 */
1816 
1817 	for_each_dpcm_be(fe, stream, dpcm) {
1818 		struct snd_soc_pcm_runtime *be = dpcm->be;
1819 		struct snd_soc_pcm_stream *pcm;
1820 		struct snd_soc_dai *dai;
1821 		int i;
1822 
1823 		for_each_rtd_dais(be, i, dai) {
1824 			/*
1825 			 * Skip DAIs which don't support the current stream
1826 			 * type. See soc_pcm_init_runtime_hw() for more details
1827 			 */
1828 			if (!snd_soc_dai_stream_valid(dai, stream))
1829 				continue;
1830 
1831 			pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1832 
1833 			soc_pcm_hw_update_rate(hw, pcm);
1834 		}
1835 	}
1836 }
1837 
dpcm_apply_symmetry(struct snd_pcm_substream * fe_substream,int stream)1838 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1839 			       int stream)
1840 {
1841 	struct snd_soc_dpcm *dpcm;
1842 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1843 	struct snd_soc_dai *fe_cpu_dai;
1844 	int err = 0;
1845 	int i;
1846 
1847 	/* apply symmetry for FE */
1848 	soc_pcm_update_symmetry(fe_substream);
1849 
1850 	for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1851 		/* Symmetry only applies if we've got an active stream. */
1852 		err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1853 		if (err < 0)
1854 			goto error;
1855 	}
1856 
1857 	/* apply symmetry for BE */
1858 	for_each_dpcm_be(fe, stream, dpcm) {
1859 		struct snd_soc_pcm_runtime *be = dpcm->be;
1860 		struct snd_pcm_substream *be_substream =
1861 			snd_soc_dpcm_get_substream(be, stream);
1862 		struct snd_soc_pcm_runtime *rtd;
1863 		struct snd_soc_dai *dai;
1864 
1865 		/* A backend may not have the requested substream */
1866 		if (!be_substream)
1867 			continue;
1868 
1869 		rtd = asoc_substream_to_rtd(be_substream);
1870 		if (rtd->dai_link->be_hw_params_fixup)
1871 			continue;
1872 
1873 		soc_pcm_update_symmetry(be_substream);
1874 
1875 		/* Symmetry only applies if we've got an active stream. */
1876 		for_each_rtd_dais(rtd, i, dai) {
1877 			err = soc_pcm_apply_symmetry(fe_substream, dai);
1878 			if (err < 0)
1879 				goto error;
1880 		}
1881 	}
1882 error:
1883 	return soc_pcm_ret(fe, err);
1884 }
1885 
dpcm_fe_dai_startup(struct snd_pcm_substream * fe_substream)1886 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1887 {
1888 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
1889 	int stream = fe_substream->stream, ret = 0;
1890 
1891 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1892 
1893 	ret = dpcm_be_dai_startup(fe, stream);
1894 	if (ret < 0)
1895 		goto be_err;
1896 
1897 	dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1898 
1899 	/* start the DAI frontend */
1900 	ret = __soc_pcm_open(fe, fe_substream);
1901 	if (ret < 0)
1902 		goto unwind;
1903 
1904 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1905 
1906 	dpcm_runtime_setup_fe(fe_substream);
1907 
1908 	dpcm_runtime_setup_be_format(fe_substream);
1909 	dpcm_runtime_setup_be_chan(fe_substream);
1910 	dpcm_runtime_setup_be_rate(fe_substream);
1911 
1912 	ret = dpcm_apply_symmetry(fe_substream, stream);
1913 
1914 unwind:
1915 	if (ret < 0)
1916 		dpcm_be_dai_startup_unwind(fe, stream);
1917 be_err:
1918 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1919 
1920 	return soc_pcm_ret(fe, ret);
1921 }
1922 
dpcm_fe_dai_shutdown(struct snd_pcm_substream * substream)1923 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1924 {
1925 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1926 	int stream = substream->stream;
1927 
1928 	snd_soc_dpcm_mutex_assert_held(fe);
1929 
1930 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1931 
1932 	/* shutdown the BEs */
1933 	dpcm_be_dai_shutdown(fe, stream);
1934 
1935 	dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1936 
1937 	/* now shutdown the frontend */
1938 	__soc_pcm_close(fe, substream);
1939 
1940 	/* run the stream stop event */
1941 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1942 
1943 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1944 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1945 	return 0;
1946 }
1947 
dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime * fe,int stream)1948 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1949 {
1950 	struct snd_soc_dpcm *dpcm;
1951 
1952 	/* only hw_params backends that are either sinks or sources
1953 	 * to this frontend DAI */
1954 	for_each_dpcm_be(fe, stream, dpcm) {
1955 
1956 		struct snd_soc_pcm_runtime *be = dpcm->be;
1957 		struct snd_pcm_substream *be_substream =
1958 			snd_soc_dpcm_get_substream(be, stream);
1959 
1960 		/* is this op for this BE ? */
1961 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1962 			continue;
1963 
1964 		/* only free hw when no longer used - check all FEs */
1965 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1966 				continue;
1967 
1968 		/* do not free hw if this BE is used by other FE */
1969 		if (be->dpcm[stream].users > 1)
1970 			continue;
1971 
1972 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1973 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1974 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1975 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1976 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1977 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1978 			continue;
1979 
1980 		dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1981 			be->dai_link->name);
1982 
1983 		__soc_pcm_hw_free(be, be_substream);
1984 
1985 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1986 	}
1987 }
1988 
dpcm_fe_dai_hw_free(struct snd_pcm_substream * substream)1989 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1990 {
1991 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
1992 	int stream = substream->stream;
1993 
1994 	snd_soc_dpcm_mutex_lock(fe);
1995 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1996 
1997 	dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1998 
1999 	/* call hw_free on the frontend */
2000 	soc_pcm_hw_clean(fe, substream, 0);
2001 
2002 	/* only hw_params backends that are either sinks or sources
2003 	 * to this frontend DAI */
2004 	dpcm_be_dai_hw_free(fe, stream);
2005 
2006 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2007 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2008 
2009 	snd_soc_dpcm_mutex_unlock(fe);
2010 	return 0;
2011 }
2012 
dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime * fe,int stream)2013 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2014 {
2015 	struct snd_soc_pcm_runtime *be;
2016 	struct snd_pcm_substream *be_substream;
2017 	struct snd_soc_dpcm *dpcm;
2018 	int ret;
2019 
2020 	for_each_dpcm_be(fe, stream, dpcm) {
2021 		struct snd_pcm_hw_params hw_params;
2022 
2023 		be = dpcm->be;
2024 		be_substream = snd_soc_dpcm_get_substream(be, stream);
2025 
2026 		/* is this op for this BE ? */
2027 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2028 			continue;
2029 
2030 		/* copy params for each dpcm */
2031 		memcpy(&hw_params, &fe->dpcm[stream].hw_params,
2032 				sizeof(struct snd_pcm_hw_params));
2033 
2034 		/* perform any hw_params fixups */
2035 		ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
2036 		if (ret < 0)
2037 			goto unwind;
2038 
2039 		/* copy the fixed-up hw params for BE dai */
2040 		memcpy(&be->dpcm[stream].hw_params, &hw_params,
2041 		       sizeof(struct snd_pcm_hw_params));
2042 
2043 		/* only allow hw_params() if no connected FEs are running */
2044 		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2045 			continue;
2046 
2047 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2048 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2049 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2050 			continue;
2051 
2052 		dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2053 			be->dai_link->name);
2054 
2055 		ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2056 		if (ret < 0)
2057 			goto unwind;
2058 
2059 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2060 	}
2061 	return 0;
2062 
2063 unwind:
2064 	dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2065 		__func__, be->dai_link->name, ret);
2066 
2067 	/* disable any enabled and non active backends */
2068 	for_each_dpcm_be_rollback(fe, stream, dpcm) {
2069 		be = dpcm->be;
2070 		be_substream = snd_soc_dpcm_get_substream(be, stream);
2071 
2072 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2073 			continue;
2074 
2075 		/* only allow hw_free() if no connected FEs are running */
2076 		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2077 			continue;
2078 
2079 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2080 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2081 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2082 		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2083 			continue;
2084 
2085 		__soc_pcm_hw_free(be, be_substream);
2086 	}
2087 
2088 	return ret;
2089 }
2090 
dpcm_fe_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)2091 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2092 				 struct snd_pcm_hw_params *params)
2093 {
2094 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2095 	int ret, stream = substream->stream;
2096 
2097 	snd_soc_dpcm_mutex_lock(fe);
2098 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2099 
2100 	memcpy(&fe->dpcm[stream].hw_params, params,
2101 			sizeof(struct snd_pcm_hw_params));
2102 	ret = dpcm_be_dai_hw_params(fe, stream);
2103 	if (ret < 0)
2104 		goto out;
2105 
2106 	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2107 			fe->dai_link->name, params_rate(params),
2108 			params_channels(params), params_format(params));
2109 
2110 	/* call hw_params on the frontend */
2111 	ret = __soc_pcm_hw_params(fe, substream, params);
2112 	if (ret < 0)
2113 		dpcm_be_dai_hw_free(fe, stream);
2114 	else
2115 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2116 
2117 out:
2118 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2119 	snd_soc_dpcm_mutex_unlock(fe);
2120 
2121 	return soc_pcm_ret(fe, ret);
2122 }
2123 
dpcm_be_dai_trigger(struct snd_soc_pcm_runtime * fe,int stream,int cmd)2124 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2125 			       int cmd)
2126 {
2127 	struct snd_soc_pcm_runtime *be;
2128 	bool pause_stop_transition;
2129 	struct snd_soc_dpcm *dpcm;
2130 	unsigned long flags;
2131 	int ret = 0;
2132 
2133 	for_each_dpcm_be(fe, stream, dpcm) {
2134 		struct snd_pcm_substream *be_substream;
2135 
2136 		be = dpcm->be;
2137 		be_substream = snd_soc_dpcm_get_substream(be, stream);
2138 
2139 		snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2140 
2141 		/* is this op for this BE ? */
2142 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2143 			goto next;
2144 
2145 		dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2146 			be->dai_link->name, cmd);
2147 
2148 		switch (cmd) {
2149 		case SNDRV_PCM_TRIGGER_START:
2150 			if (!be->dpcm[stream].be_start &&
2151 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2152 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2153 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2154 				goto next;
2155 
2156 			be->dpcm[stream].be_start++;
2157 			if (be->dpcm[stream].be_start != 1)
2158 				goto next;
2159 
2160 			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2161 				ret = soc_pcm_trigger(be_substream,
2162 						      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2163 			else
2164 				ret = soc_pcm_trigger(be_substream,
2165 						      SNDRV_PCM_TRIGGER_START);
2166 			if (ret) {
2167 				be->dpcm[stream].be_start--;
2168 				goto next;
2169 			}
2170 
2171 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2172 			break;
2173 		case SNDRV_PCM_TRIGGER_RESUME:
2174 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2175 				goto next;
2176 
2177 			be->dpcm[stream].be_start++;
2178 			if (be->dpcm[stream].be_start != 1)
2179 				goto next;
2180 
2181 			ret = soc_pcm_trigger(be_substream, cmd);
2182 			if (ret) {
2183 				be->dpcm[stream].be_start--;
2184 				goto next;
2185 			}
2186 
2187 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2188 			break;
2189 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2190 			if (!be->dpcm[stream].be_start &&
2191 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2192 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2193 				goto next;
2194 
2195 			fe->dpcm[stream].fe_pause = false;
2196 			be->dpcm[stream].be_pause--;
2197 
2198 			be->dpcm[stream].be_start++;
2199 			if (be->dpcm[stream].be_start != 1)
2200 				goto next;
2201 
2202 			ret = soc_pcm_trigger(be_substream, cmd);
2203 			if (ret) {
2204 				be->dpcm[stream].be_start--;
2205 				goto next;
2206 			}
2207 
2208 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2209 			break;
2210 		case SNDRV_PCM_TRIGGER_STOP:
2211 			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2212 			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2213 				goto next;
2214 
2215 			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2216 				be->dpcm[stream].be_start--;
2217 
2218 			if (be->dpcm[stream].be_start != 0)
2219 				goto next;
2220 
2221 			pause_stop_transition = false;
2222 			if (fe->dpcm[stream].fe_pause) {
2223 				pause_stop_transition = true;
2224 				fe->dpcm[stream].fe_pause = false;
2225 				be->dpcm[stream].be_pause--;
2226 			}
2227 
2228 			if (be->dpcm[stream].be_pause != 0)
2229 				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2230 			else
2231 				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2232 
2233 			if (ret) {
2234 				if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2235 					be->dpcm[stream].be_start++;
2236 				if (pause_stop_transition) {
2237 					fe->dpcm[stream].fe_pause = true;
2238 					be->dpcm[stream].be_pause++;
2239 				}
2240 				goto next;
2241 			}
2242 
2243 			if (be->dpcm[stream].be_pause != 0)
2244 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2245 			else
2246 				be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2247 
2248 			break;
2249 		case SNDRV_PCM_TRIGGER_SUSPEND:
2250 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2251 				goto next;
2252 
2253 			be->dpcm[stream].be_start--;
2254 			if (be->dpcm[stream].be_start != 0)
2255 				goto next;
2256 
2257 			ret = soc_pcm_trigger(be_substream, cmd);
2258 			if (ret) {
2259 				be->dpcm[stream].be_start++;
2260 				goto next;
2261 			}
2262 
2263 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
2264 			break;
2265 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2266 			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2267 				goto next;
2268 
2269 			fe->dpcm[stream].fe_pause = true;
2270 			be->dpcm[stream].be_pause++;
2271 
2272 			be->dpcm[stream].be_start--;
2273 			if (be->dpcm[stream].be_start != 0)
2274 				goto next;
2275 
2276 			ret = soc_pcm_trigger(be_substream, cmd);
2277 			if (ret) {
2278 				be->dpcm[stream].be_start++;
2279 				goto next;
2280 			}
2281 
2282 			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2283 			break;
2284 		}
2285 next:
2286 		snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2287 		if (ret)
2288 			break;
2289 	}
2290 	return soc_pcm_ret(fe, ret);
2291 }
2292 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2293 
dpcm_dai_trigger_fe_be(struct snd_pcm_substream * substream,int cmd,bool fe_first)2294 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2295 				  int cmd, bool fe_first)
2296 {
2297 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2298 	int ret;
2299 
2300 	/* call trigger on the frontend before the backend. */
2301 	if (fe_first) {
2302 		dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2303 			fe->dai_link->name, cmd);
2304 
2305 		ret = soc_pcm_trigger(substream, cmd);
2306 		if (ret < 0)
2307 			return ret;
2308 
2309 		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2310 		return ret;
2311 	}
2312 
2313 	/* call trigger on the frontend after the backend. */
2314 	ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2315 	if (ret < 0)
2316 		return ret;
2317 
2318 	dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2319 		fe->dai_link->name, cmd);
2320 
2321 	ret = soc_pcm_trigger(substream, cmd);
2322 
2323 	return ret;
2324 }
2325 
dpcm_fe_dai_do_trigger(struct snd_pcm_substream * substream,int cmd)2326 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2327 {
2328 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2329 	int stream = substream->stream;
2330 	int ret = 0;
2331 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2332 
2333 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2334 
2335 	switch (trigger) {
2336 	case SND_SOC_DPCM_TRIGGER_PRE:
2337 		switch (cmd) {
2338 		case SNDRV_PCM_TRIGGER_START:
2339 		case SNDRV_PCM_TRIGGER_RESUME:
2340 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2341 		case SNDRV_PCM_TRIGGER_DRAIN:
2342 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2343 			break;
2344 		case SNDRV_PCM_TRIGGER_STOP:
2345 		case SNDRV_PCM_TRIGGER_SUSPEND:
2346 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2347 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2348 			break;
2349 		default:
2350 			ret = -EINVAL;
2351 			break;
2352 		}
2353 		break;
2354 	case SND_SOC_DPCM_TRIGGER_POST:
2355 		switch (cmd) {
2356 		case SNDRV_PCM_TRIGGER_START:
2357 		case SNDRV_PCM_TRIGGER_RESUME:
2358 		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2359 		case SNDRV_PCM_TRIGGER_DRAIN:
2360 			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2361 			break;
2362 		case SNDRV_PCM_TRIGGER_STOP:
2363 		case SNDRV_PCM_TRIGGER_SUSPEND:
2364 		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2365 			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2366 			break;
2367 		default:
2368 			ret = -EINVAL;
2369 			break;
2370 		}
2371 		break;
2372 	case SND_SOC_DPCM_TRIGGER_BESPOKE:
2373 		/* bespoke trigger() - handles both FE and BEs */
2374 
2375 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2376 				fe->dai_link->name, cmd);
2377 
2378 		ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2379 		break;
2380 	default:
2381 		dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2382 				fe->dai_link->name);
2383 		ret = -EINVAL;
2384 		goto out;
2385 	}
2386 
2387 	if (ret < 0) {
2388 		dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2389 			cmd, ret);
2390 		goto out;
2391 	}
2392 
2393 	switch (cmd) {
2394 	case SNDRV_PCM_TRIGGER_START:
2395 	case SNDRV_PCM_TRIGGER_RESUME:
2396 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2397 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2398 		break;
2399 	case SNDRV_PCM_TRIGGER_STOP:
2400 	case SNDRV_PCM_TRIGGER_SUSPEND:
2401 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2402 		break;
2403 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2404 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2405 		break;
2406 	}
2407 
2408 out:
2409 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2410 	return ret;
2411 }
2412 
dpcm_fe_dai_trigger(struct snd_pcm_substream * substream,int cmd)2413 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2414 {
2415 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2416 	int stream = substream->stream;
2417 
2418 	/* if FE's runtime_update is already set, we're in race;
2419 	 * process this trigger later at exit
2420 	 */
2421 	if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2422 		fe->dpcm[stream].trigger_pending = cmd + 1;
2423 		return 0; /* delayed, assuming it's successful */
2424 	}
2425 
2426 	/* we're alone, let's trigger */
2427 	return dpcm_fe_dai_do_trigger(substream, cmd);
2428 }
2429 
dpcm_be_dai_prepare(struct snd_soc_pcm_runtime * fe,int stream)2430 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2431 {
2432 	struct snd_soc_dpcm *dpcm;
2433 	int ret = 0;
2434 
2435 	for_each_dpcm_be(fe, stream, dpcm) {
2436 
2437 		struct snd_soc_pcm_runtime *be = dpcm->be;
2438 		struct snd_pcm_substream *be_substream =
2439 			snd_soc_dpcm_get_substream(be, stream);
2440 
2441 		/* is this op for this BE ? */
2442 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2443 			continue;
2444 
2445 		if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
2446 			continue;
2447 
2448 		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2449 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2450 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2451 		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2452 			continue;
2453 
2454 		dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2455 			be->dai_link->name);
2456 
2457 		ret = __soc_pcm_prepare(be, be_substream);
2458 		if (ret < 0)
2459 			break;
2460 
2461 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2462 	}
2463 
2464 	return soc_pcm_ret(fe, ret);
2465 }
2466 
dpcm_fe_dai_prepare(struct snd_pcm_substream * substream)2467 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2468 {
2469 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
2470 	int stream = substream->stream, ret = 0;
2471 
2472 	snd_soc_dpcm_mutex_lock(fe);
2473 
2474 	dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2475 
2476 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2477 
2478 	/* there is no point preparing this FE if there are no BEs */
2479 	if (list_empty(&fe->dpcm[stream].be_clients)) {
2480 		/* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */
2481 		dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n",
2482 			     fe->dai_link->name);
2483 		dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2484 			fe->dai_link->name);
2485 		ret = -EINVAL;
2486 		goto out;
2487 	}
2488 
2489 	ret = dpcm_be_dai_prepare(fe, stream);
2490 	if (ret < 0)
2491 		goto out;
2492 
2493 	/* call prepare on the frontend */
2494 	ret = __soc_pcm_prepare(fe, substream);
2495 	if (ret < 0)
2496 		goto out;
2497 
2498 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2499 
2500 out:
2501 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2502 	snd_soc_dpcm_mutex_unlock(fe);
2503 
2504 	return soc_pcm_ret(fe, ret);
2505 }
2506 
dpcm_run_update_shutdown(struct snd_soc_pcm_runtime * fe,int stream)2507 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2508 {
2509 	struct snd_pcm_substream *substream =
2510 		snd_soc_dpcm_get_substream(fe, stream);
2511 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2512 	int err;
2513 
2514 	dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2515 			stream ? "capture" : "playback", fe->dai_link->name);
2516 
2517 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2518 		/* call bespoke trigger - FE takes care of all BE triggers */
2519 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2520 				fe->dai_link->name);
2521 
2522 		err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2523 	} else {
2524 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2525 			fe->dai_link->name);
2526 
2527 		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2528 	}
2529 
2530 	dpcm_be_dai_hw_free(fe, stream);
2531 
2532 	dpcm_be_dai_shutdown(fe, stream);
2533 
2534 	/* run the stream event for each BE */
2535 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2536 
2537 	return soc_pcm_ret(fe, err);
2538 }
2539 
dpcm_run_update_startup(struct snd_soc_pcm_runtime * fe,int stream)2540 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2541 {
2542 	struct snd_pcm_substream *substream =
2543 		snd_soc_dpcm_get_substream(fe, stream);
2544 	struct snd_soc_dpcm *dpcm;
2545 	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2546 	int ret = 0;
2547 
2548 	dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2549 			stream ? "capture" : "playback", fe->dai_link->name);
2550 
2551 	/* Only start the BE if the FE is ready */
2552 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2553 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2554 		dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2555 			fe->dai_link->name, fe->dpcm[stream].state);
2556 		ret = -EINVAL;
2557 		goto disconnect;
2558 	}
2559 
2560 	/* startup must always be called for new BEs */
2561 	ret = dpcm_be_dai_startup(fe, stream);
2562 	if (ret < 0)
2563 		goto disconnect;
2564 
2565 	/* keep going if FE state is > open */
2566 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2567 		return 0;
2568 
2569 	ret = dpcm_be_dai_hw_params(fe, stream);
2570 	if (ret < 0)
2571 		goto close;
2572 
2573 	/* keep going if FE state is > hw_params */
2574 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2575 		return 0;
2576 
2577 	ret = dpcm_be_dai_prepare(fe, stream);
2578 	if (ret < 0)
2579 		goto hw_free;
2580 
2581 	/* run the stream event for each BE */
2582 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2583 
2584 	/* keep going if FE state is > prepare */
2585 	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2586 		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2587 		return 0;
2588 
2589 	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2590 		/* call trigger on the frontend - FE takes care of all BE triggers */
2591 		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2592 				fe->dai_link->name);
2593 
2594 		ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2595 		if (ret < 0)
2596 			goto hw_free;
2597 	} else {
2598 		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2599 			fe->dai_link->name);
2600 
2601 		ret = dpcm_be_dai_trigger(fe, stream,
2602 					SNDRV_PCM_TRIGGER_START);
2603 		if (ret < 0)
2604 			goto hw_free;
2605 	}
2606 
2607 	return 0;
2608 
2609 hw_free:
2610 	dpcm_be_dai_hw_free(fe, stream);
2611 close:
2612 	dpcm_be_dai_shutdown(fe, stream);
2613 disconnect:
2614 	/* disconnect any pending BEs */
2615 	for_each_dpcm_be(fe, stream, dpcm) {
2616 		struct snd_soc_pcm_runtime *be = dpcm->be;
2617 
2618 		/* is this op for this BE ? */
2619 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2620 			continue;
2621 
2622 		if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2623 			be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2624 				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2625 	}
2626 
2627 	return soc_pcm_ret(fe, ret);
2628 }
2629 
soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime * fe,int new)2630 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2631 {
2632 	struct snd_soc_dapm_widget_list *list;
2633 	int stream;
2634 	int count, paths;
2635 
2636 	if (!fe->dai_link->dynamic)
2637 		return 0;
2638 
2639 	if (fe->dai_link->num_cpus > 1) {
2640 		dev_err(fe->dev,
2641 			"%s doesn't support Multi CPU yet\n", __func__);
2642 		return -EINVAL;
2643 	}
2644 
2645 	/* only check active links */
2646 	if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
2647 		return 0;
2648 
2649 	/* DAPM sync will call this to update DSP paths */
2650 	dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2651 		new ? "new" : "old", fe->dai_link->name);
2652 
2653 	for_each_pcm_streams(stream) {
2654 
2655 		/* skip if FE doesn't have playback/capture capability */
2656 		if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
2657 		    !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
2658 			continue;
2659 
2660 		/* skip if FE isn't currently playing/capturing */
2661 		if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
2662 		    !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
2663 			continue;
2664 
2665 		paths = dpcm_path_get(fe, stream, &list);
2666 		if (paths < 0)
2667 			return paths;
2668 
2669 		/* update any playback/capture paths */
2670 		count = dpcm_process_paths(fe, stream, &list, new);
2671 		if (count) {
2672 			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2673 			if (new)
2674 				dpcm_run_update_startup(fe, stream);
2675 			else
2676 				dpcm_run_update_shutdown(fe, stream);
2677 			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2678 
2679 			dpcm_clear_pending_state(fe, stream);
2680 			dpcm_be_disconnect(fe, stream);
2681 		}
2682 
2683 		dpcm_path_put(&list);
2684 	}
2685 
2686 	return 0;
2687 }
2688 
2689 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2690  * any DAI links.
2691  */
snd_soc_dpcm_runtime_update(struct snd_soc_card * card)2692 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2693 {
2694 	struct snd_soc_pcm_runtime *fe;
2695 	int ret = 0;
2696 
2697 	snd_soc_dpcm_mutex_lock(card);
2698 	/* shutdown all old paths first */
2699 	for_each_card_rtds(card, fe) {
2700 		ret = soc_dpcm_fe_runtime_update(fe, 0);
2701 		if (ret)
2702 			goto out;
2703 	}
2704 
2705 	/* bring new paths up */
2706 	for_each_card_rtds(card, fe) {
2707 		ret = soc_dpcm_fe_runtime_update(fe, 1);
2708 		if (ret)
2709 			goto out;
2710 	}
2711 
2712 out:
2713 	snd_soc_dpcm_mutex_unlock(card);
2714 	return ret;
2715 }
2716 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2717 
dpcm_fe_dai_cleanup(struct snd_pcm_substream * fe_substream)2718 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2719 {
2720 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2721 	struct snd_soc_dpcm *dpcm;
2722 	int stream = fe_substream->stream;
2723 
2724 	snd_soc_dpcm_mutex_assert_held(fe);
2725 
2726 	/* mark FE's links ready to prune */
2727 	for_each_dpcm_be(fe, stream, dpcm)
2728 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2729 
2730 	dpcm_be_disconnect(fe, stream);
2731 }
2732 
dpcm_fe_dai_close(struct snd_pcm_substream * fe_substream)2733 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2734 {
2735 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2736 	int ret;
2737 
2738 	snd_soc_dpcm_mutex_lock(fe);
2739 	ret = dpcm_fe_dai_shutdown(fe_substream);
2740 
2741 	dpcm_fe_dai_cleanup(fe_substream);
2742 
2743 	snd_soc_dpcm_mutex_unlock(fe);
2744 	return ret;
2745 }
2746 
dpcm_fe_dai_open(struct snd_pcm_substream * fe_substream)2747 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2748 {
2749 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
2750 	struct snd_soc_dapm_widget_list *list;
2751 	int ret;
2752 	int stream = fe_substream->stream;
2753 
2754 	snd_soc_dpcm_mutex_lock(fe);
2755 
2756 	ret = dpcm_path_get(fe, stream, &list);
2757 	if (ret < 0)
2758 		goto open_end;
2759 
2760 	/* calculate valid and active FE <-> BE dpcms */
2761 	dpcm_process_paths(fe, stream, &list, 1);
2762 
2763 	ret = dpcm_fe_dai_startup(fe_substream);
2764 	if (ret < 0)
2765 		dpcm_fe_dai_cleanup(fe_substream);
2766 
2767 	dpcm_clear_pending_state(fe, stream);
2768 	dpcm_path_put(&list);
2769 open_end:
2770 	snd_soc_dpcm_mutex_unlock(fe);
2771 	return ret;
2772 }
2773 
soc_get_playback_capture(struct snd_soc_pcm_runtime * rtd,int * playback,int * capture)2774 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2775 				    int *playback, int *capture)
2776 {
2777 	struct snd_soc_dai_link *dai_link = rtd->dai_link;
2778 	struct snd_soc_dai *cpu_dai;
2779 	int has_playback = 0;
2780 	int has_capture  = 0;
2781 	int i;
2782 
2783 	if (dai_link->dynamic && dai_link->num_cpus > 1) {
2784 		dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2785 		return -EINVAL;
2786 	}
2787 
2788 	if (dai_link->dynamic || dai_link->no_pcm) {
2789 		int stream;
2790 
2791 		if (dai_link->dpcm_playback) {
2792 			stream = SNDRV_PCM_STREAM_PLAYBACK;
2793 
2794 			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2795 				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2796 					has_playback = 1;
2797 					break;
2798 				}
2799 			}
2800 			if (!has_playback) {
2801 				dev_err(rtd->card->dev,
2802 					"No CPU DAIs support playback for stream %s\n",
2803 					dai_link->stream_name);
2804 				return -EINVAL;
2805 			}
2806 		}
2807 		if (dai_link->dpcm_capture) {
2808 			stream = SNDRV_PCM_STREAM_CAPTURE;
2809 
2810 			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2811 				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2812 					has_capture = 1;
2813 					break;
2814 				}
2815 			}
2816 
2817 			if (!has_capture) {
2818 				dev_err(rtd->card->dev,
2819 					"No CPU DAIs support capture for stream %s\n",
2820 					dai_link->stream_name);
2821 				return -EINVAL;
2822 			}
2823 		}
2824 	} else {
2825 		struct snd_soc_dai *codec_dai;
2826 
2827 		/* Adapt stream for codec2codec links */
2828 		int cpu_capture  = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE);
2829 		int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK);
2830 
2831 		for_each_rtd_codec_dais(rtd, i, codec_dai) {
2832 			if (dai_link->num_cpus == 1) {
2833 				cpu_dai = asoc_rtd_to_cpu(rtd, 0);
2834 			} else if (dai_link->num_cpus == dai_link->num_codecs) {
2835 				cpu_dai = asoc_rtd_to_cpu(rtd, i);
2836 			} else if (rtd->dai_link->num_codecs > rtd->dai_link->num_cpus) {
2837 				int cpu_id;
2838 
2839 				if (!rtd->dai_link->codec_ch_maps) {
2840 					dev_err(rtd->card->dev, "%s: no codec channel mapping table provided\n",
2841 						__func__);
2842 					return -EINVAL;
2843 				}
2844 
2845 				cpu_id = rtd->dai_link->codec_ch_maps[i].connected_cpu_id;
2846 				cpu_dai = asoc_rtd_to_cpu(rtd, cpu_id);
2847 			} else {
2848 				dev_err(rtd->card->dev,
2849 					"%s codec number %d < cpu number %d is not supported\n",
2850 					__func__, rtd->dai_link->num_codecs,
2851 					rtd->dai_link->num_cpus);
2852 				return -EINVAL;
2853 			}
2854 
2855 			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2856 			    snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
2857 				has_playback = 1;
2858 			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2859 			    snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
2860 				has_capture = 1;
2861 		}
2862 	}
2863 
2864 	if (dai_link->playback_only)
2865 		has_capture = 0;
2866 
2867 	if (dai_link->capture_only)
2868 		has_playback = 0;
2869 
2870 	if (!has_playback && !has_capture) {
2871 		dev_err(rtd->dev, "substream %s has no playback, no capture\n",
2872 			dai_link->stream_name);
2873 
2874 		return -EINVAL;
2875 	}
2876 
2877 	*playback = has_playback;
2878 	*capture  = has_capture;
2879 
2880 	return 0;
2881 }
2882 
soc_create_pcm(struct snd_pcm ** pcm,struct snd_soc_pcm_runtime * rtd,int playback,int capture,int num)2883 static int soc_create_pcm(struct snd_pcm **pcm,
2884 			  struct snd_soc_pcm_runtime *rtd,
2885 			  int playback, int capture, int num)
2886 {
2887 	char new_name[64];
2888 	int ret;
2889 
2890 	/* create the PCM */
2891 	if (rtd->dai_link->c2c_params) {
2892 		snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2893 			 rtd->dai_link->stream_name);
2894 
2895 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2896 					   playback, capture, pcm);
2897 	} else if (rtd->dai_link->no_pcm) {
2898 		snprintf(new_name, sizeof(new_name), "(%s)",
2899 			rtd->dai_link->stream_name);
2900 
2901 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2902 				playback, capture, pcm);
2903 	} else {
2904 		if (rtd->dai_link->dynamic)
2905 			snprintf(new_name, sizeof(new_name), "%s (*)",
2906 				rtd->dai_link->stream_name);
2907 		else
2908 			snprintf(new_name, sizeof(new_name), "%s %s-%d",
2909 				rtd->dai_link->stream_name,
2910 				soc_codec_dai_name(rtd), num);
2911 
2912 		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2913 			capture, pcm);
2914 	}
2915 	if (ret < 0) {
2916 		dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2917 			new_name, rtd->dai_link->name, ret);
2918 		return ret;
2919 	}
2920 	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2921 
2922 	return 0;
2923 }
2924 
2925 /* create a new pcm */
soc_new_pcm(struct snd_soc_pcm_runtime * rtd,int num)2926 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2927 {
2928 	struct snd_soc_component *component;
2929 	struct snd_pcm *pcm;
2930 	int ret = 0, playback = 0, capture = 0;
2931 	int i;
2932 
2933 	ret = soc_get_playback_capture(rtd, &playback, &capture);
2934 	if (ret < 0)
2935 		return ret;
2936 
2937 	ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2938 	if (ret < 0)
2939 		return ret;
2940 
2941 	/* DAPM dai link stream work */
2942 	/*
2943 	 * Currently nothing to do for c2c links
2944 	 * Since c2c links are internal nodes in the DAPM graph and
2945 	 * don't interface with the outside world or application layer
2946 	 * we don't have to do any special handling on close.
2947 	 */
2948 	if (!rtd->dai_link->c2c_params)
2949 		rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2950 
2951 	rtd->pcm = pcm;
2952 	pcm->nonatomic = rtd->dai_link->nonatomic;
2953 	pcm->private_data = rtd;
2954 	pcm->no_device_suspend = true;
2955 
2956 	if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) {
2957 		if (playback)
2958 			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2959 		if (capture)
2960 			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2961 		goto out;
2962 	}
2963 
2964 	/* ASoC PCM operations */
2965 	if (rtd->dai_link->dynamic) {
2966 		rtd->ops.open		= dpcm_fe_dai_open;
2967 		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
2968 		rtd->ops.prepare	= dpcm_fe_dai_prepare;
2969 		rtd->ops.trigger	= dpcm_fe_dai_trigger;
2970 		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
2971 		rtd->ops.close		= dpcm_fe_dai_close;
2972 		rtd->ops.pointer	= soc_pcm_pointer;
2973 	} else {
2974 		rtd->ops.open		= soc_pcm_open;
2975 		rtd->ops.hw_params	= soc_pcm_hw_params;
2976 		rtd->ops.prepare	= soc_pcm_prepare;
2977 		rtd->ops.trigger	= soc_pcm_trigger;
2978 		rtd->ops.hw_free	= soc_pcm_hw_free;
2979 		rtd->ops.close		= soc_pcm_close;
2980 		rtd->ops.pointer	= soc_pcm_pointer;
2981 	}
2982 
2983 	for_each_rtd_components(rtd, i, component) {
2984 		const struct snd_soc_component_driver *drv = component->driver;
2985 
2986 		if (drv->ioctl)
2987 			rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
2988 		if (drv->sync_stop)
2989 			rtd->ops.sync_stop	= snd_soc_pcm_component_sync_stop;
2990 		if (drv->copy)
2991 			rtd->ops.copy		= snd_soc_pcm_component_copy;
2992 		if (drv->page)
2993 			rtd->ops.page		= snd_soc_pcm_component_page;
2994 		if (drv->mmap)
2995 			rtd->ops.mmap		= snd_soc_pcm_component_mmap;
2996 		if (drv->ack)
2997 			rtd->ops.ack            = snd_soc_pcm_component_ack;
2998 	}
2999 
3000 	if (playback)
3001 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3002 
3003 	if (capture)
3004 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3005 
3006 	ret = snd_soc_pcm_component_new(rtd);
3007 	if (ret < 0)
3008 		return ret;
3009 out:
3010 	dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
3011 		soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
3012 	return ret;
3013 }
3014 
3015 /* is the current PCM operation for this FE ? */
snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime * fe,int stream)3016 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3017 {
3018 	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3019 		return 1;
3020 	return 0;
3021 }
3022 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3023 
3024 /* 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)3025 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3026 		struct snd_soc_pcm_runtime *be, int stream)
3027 {
3028 	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3029 	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3030 		  be->dpcm[stream].runtime_update))
3031 		return 1;
3032 	return 0;
3033 }
3034 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3035 
3036 /* get the substream for this BE */
3037 struct snd_pcm_substream *
snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime * be,int stream)3038 	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3039 {
3040 	return be->pcm->streams[stream].substream;
3041 }
3042 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3043 
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)3044 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
3045 				    struct snd_soc_pcm_runtime *be,
3046 				    int stream,
3047 				    const enum snd_soc_dpcm_state *states,
3048 				    int num_states)
3049 {
3050 	struct snd_soc_dpcm *dpcm;
3051 	int state;
3052 	int ret = 1;
3053 	int i;
3054 
3055 	for_each_dpcm_fe(be, stream, dpcm) {
3056 
3057 		if (dpcm->fe == fe)
3058 			continue;
3059 
3060 		state = dpcm->fe->dpcm[stream].state;
3061 		for (i = 0; i < num_states; i++) {
3062 			if (state == states[i]) {
3063 				ret = 0;
3064 				break;
3065 			}
3066 		}
3067 	}
3068 
3069 	/* it's safe to do this BE DAI */
3070 	return ret;
3071 }
3072 
3073 /*
3074  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3075  * are not running, paused or suspended for the specified stream direction.
3076  */
snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)3077 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3078 		struct snd_soc_pcm_runtime *be, int stream)
3079 {
3080 	const enum snd_soc_dpcm_state state[] = {
3081 		SND_SOC_DPCM_STATE_START,
3082 		SND_SOC_DPCM_STATE_PAUSED,
3083 		SND_SOC_DPCM_STATE_SUSPEND,
3084 	};
3085 
3086 	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3087 }
3088 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3089 
3090 /*
3091  * We can only change hw params a BE DAI if any of it's FE are not prepared,
3092  * running, paused or suspended for the specified stream direction.
3093  */
snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)3094 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3095 		struct snd_soc_pcm_runtime *be, int stream)
3096 {
3097 	const enum snd_soc_dpcm_state state[] = {
3098 		SND_SOC_DPCM_STATE_START,
3099 		SND_SOC_DPCM_STATE_PAUSED,
3100 		SND_SOC_DPCM_STATE_SUSPEND,
3101 		SND_SOC_DPCM_STATE_PREPARE,
3102 	};
3103 
3104 	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3105 }
3106 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3107 
3108 /*
3109  * We can only prepare a BE DAI if any of it's FE are not prepared,
3110  * running or paused for the specified stream direction.
3111  */
snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime * fe,struct snd_soc_pcm_runtime * be,int stream)3112 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
3113 				 struct snd_soc_pcm_runtime *be, int stream)
3114 {
3115 	const enum snd_soc_dpcm_state state[] = {
3116 		SND_SOC_DPCM_STATE_START,
3117 		SND_SOC_DPCM_STATE_PAUSED,
3118 		SND_SOC_DPCM_STATE_PREPARE,
3119 	};
3120 
3121 	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3122 }
3123 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);
3124