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)
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
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
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
72 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
73 {
74 return (rtd)->dai_link->num_cpus == 1 ? snd_soc_rtd_to_cpu(rtd, 0)->name : "multicpu";
75 }
76 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
77 {
78 return (rtd)->dai_link->num_codecs == 1 ? snd_soc_rtd_to_codec(rtd, 0)->name : "multicodec";
79 }
80
81 #ifdef CONFIG_DEBUG_FS
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
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
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(snd_soc_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
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
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
235 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
236 {
237 debugfs_remove_recursive(dpcm->debugfs_state);
238 }
239
240 #else
241 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
242 int stream)
243 {
244 }
245
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);
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
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 */
292 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
293 int stream, int action)
294 {
295 struct snd_soc_component *component;
296 struct snd_soc_dai *dai;
297 int i;
298
299 snd_soc_dpcm_mutex_assert_held(rtd);
300
301 for_each_rtd_dais(rtd, i, dai)
302 snd_soc_dai_action(dai, stream, action);
303
304 /* Increments/Decrements the active count for components without DAIs */
305 for_each_rtd_components(rtd, i, component) {
306 if (component->num_dai)
307 continue;
308 component->active += action;
309 }
310 }
311 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
312
313 /**
314 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
315 * @rtd: The ASoC PCM runtime that should be checked.
316 *
317 * This function checks whether the power down delay should be ignored for a
318 * specific PCM runtime. Returns true if the delay is 0, if the DAI link has
319 * been configured to ignore the delay, or if none of the components benefits
320 * from having the delay.
321 */
322 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
323 {
324 struct snd_soc_component *component;
325 int i;
326
327 if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
328 return true;
329
330 for_each_rtd_components(rtd, i, component)
331 if (component->driver->use_pmdown_time)
332 /* No need to go through all components */
333 return false;
334
335 return true;
336 }
337
338 /**
339 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
340 * @substream: the pcm substream
341 * @hw: the hardware parameters
342 *
343 * Sets the substream runtime hardware parameters.
344 */
345 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
346 const struct snd_pcm_hardware *hw)
347 {
348 substream->runtime->hw = *hw;
349
350 return 0;
351 }
352 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
353
354 /* DPCM stream event, send event to FE and all active BEs. */
355 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
356 int event)
357 {
358 struct snd_soc_dpcm *dpcm;
359
360 snd_soc_dpcm_mutex_assert_held(fe);
361
362 for_each_dpcm_be(fe, dir, dpcm) {
363
364 struct snd_soc_pcm_runtime *be = dpcm->be;
365
366 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
367 be->dai_link->name, event, dir);
368
369 if ((event == SND_SOC_DAPM_STREAM_STOP) &&
370 (be->dpcm[dir].users >= 1))
371 continue;
372
373 snd_soc_dapm_stream_event(be, dir, event);
374 }
375
376 snd_soc_dapm_stream_event(fe, dir, event);
377
378 return 0;
379 }
380
381 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
382 struct snd_pcm_hw_params *params)
383 {
384 if (params) {
385 dai->rate = params_rate(params);
386 dai->channels = params_channels(params);
387 dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
388 } else {
389 dai->rate = 0;
390 dai->channels = 0;
391 dai->sample_bits = 0;
392 }
393 }
394
395 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
396 struct snd_soc_dai *soc_dai)
397 {
398 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
399 int ret;
400
401 if (!snd_soc_dai_active(soc_dai))
402 return 0;
403
404 #define __soc_pcm_apply_symmetry(name, NAME) \
405 if (soc_dai->name && (soc_dai->driver->symmetric_##name || \
406 rtd->dai_link->symmetric_##name)) { \
407 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
408 #name, soc_dai->name); \
409 \
410 ret = snd_pcm_hw_constraint_single(substream->runtime, \
411 SNDRV_PCM_HW_PARAM_##NAME,\
412 soc_dai->name); \
413 if (ret < 0) { \
414 dev_err(soc_dai->dev, \
415 "ASoC: Unable to apply %s constraint: %d\n",\
416 #name, ret); \
417 return ret; \
418 } \
419 }
420
421 __soc_pcm_apply_symmetry(rate, RATE);
422 __soc_pcm_apply_symmetry(channels, CHANNELS);
423 __soc_pcm_apply_symmetry(sample_bits, SAMPLE_BITS);
424
425 return 0;
426 }
427
428 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
429 struct snd_pcm_hw_params *params)
430 {
431 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
432 struct snd_soc_dai d;
433 struct snd_soc_dai *dai;
434 struct snd_soc_dai *cpu_dai;
435 unsigned int symmetry, i;
436
437 d.name = __func__;
438 soc_pcm_set_dai_params(&d, params);
439
440 #define __soc_pcm_params_symmetry(xxx) \
441 symmetry = rtd->dai_link->symmetric_##xxx; \
442 for_each_rtd_dais(rtd, i, dai) \
443 symmetry |= dai->driver->symmetric_##xxx; \
444 \
445 if (symmetry) \
446 for_each_rtd_cpu_dais(rtd, i, cpu_dai) \
447 if (!snd_soc_dai_is_dummy(cpu_dai) && \
448 cpu_dai->xxx && cpu_dai->xxx != d.xxx) { \
449 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
450 #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
451 return -EINVAL; \
452 }
453
454 /* reject unmatched parameters when applying symmetry */
455 __soc_pcm_params_symmetry(rate);
456 __soc_pcm_params_symmetry(channels);
457 __soc_pcm_params_symmetry(sample_bits);
458
459 return 0;
460 }
461
462 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
463 {
464 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
465 struct snd_soc_dai_link *link = rtd->dai_link;
466 struct snd_soc_dai *dai;
467 unsigned int symmetry, i;
468
469 symmetry = link->symmetric_rate ||
470 link->symmetric_channels ||
471 link->symmetric_sample_bits;
472
473 for_each_rtd_dais(rtd, i, dai)
474 symmetry = symmetry ||
475 dai->driver->symmetric_rate ||
476 dai->driver->symmetric_channels ||
477 dai->driver->symmetric_sample_bits;
478
479 if (symmetry)
480 substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
481 }
482
483 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
484 {
485 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
486 int ret;
487
488 if (!bits)
489 return;
490
491 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
492 if (ret != 0)
493 dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
494 bits, ret);
495 }
496
497 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
498 {
499 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
500 struct snd_soc_dai *cpu_dai;
501 struct snd_soc_dai *codec_dai;
502 int stream = substream->stream;
503 int i;
504 unsigned int bits = 0, cpu_bits = 0;
505
506 for_each_rtd_codec_dais(rtd, i, codec_dai) {
507 const struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
508
509 if (pcm_codec->sig_bits == 0) {
510 bits = 0;
511 break;
512 }
513 bits = max(pcm_codec->sig_bits, bits);
514 }
515
516 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
517 const struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
518
519 if (pcm_cpu->sig_bits == 0) {
520 cpu_bits = 0;
521 break;
522 }
523 cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
524 }
525
526 soc_pcm_set_msb(substream, bits);
527 soc_pcm_set_msb(substream, cpu_bits);
528 }
529
530 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
531 {
532 hw->rates = UINT_MAX;
533 hw->rate_min = 0;
534 hw->rate_max = UINT_MAX;
535 hw->channels_min = 0;
536 hw->channels_max = UINT_MAX;
537 hw->formats = ULLONG_MAX;
538 }
539
540 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
541 const struct snd_soc_pcm_stream *p)
542 {
543 hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
544
545 /* setup hw->rate_min/max via hw->rates first */
546 snd_pcm_hw_limit_rates(hw);
547
548 /* update hw->rate_min/max by snd_soc_pcm_stream */
549 hw->rate_min = max(hw->rate_min, p->rate_min);
550 hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
551 }
552
553 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
554 const struct snd_soc_pcm_stream *p)
555 {
556 hw->channels_min = max(hw->channels_min, p->channels_min);
557 hw->channels_max = min(hw->channels_max, p->channels_max);
558 }
559
560 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
561 const struct snd_soc_pcm_stream *p)
562 {
563 hw->formats &= p->formats;
564 }
565
566 static void soc_pcm_hw_update_subformat(struct snd_pcm_hardware *hw,
567 const struct snd_soc_pcm_stream *p)
568 {
569 hw->subformats &= p->subformats;
570 }
571
572 /**
573 * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
574 * @rtd: ASoC PCM runtime
575 * @hw: PCM hardware parameters (output)
576 * @stream: Direction of the PCM stream
577 *
578 * Calculates the subset of stream parameters supported by all DAIs
579 * associated with the PCM stream.
580 */
581 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
582 struct snd_pcm_hardware *hw, int stream)
583 {
584 struct snd_soc_dai *codec_dai;
585 struct snd_soc_dai *cpu_dai;
586 const struct snd_soc_pcm_stream *codec_stream;
587 const struct snd_soc_pcm_stream *cpu_stream;
588 unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
589 int i;
590
591 soc_pcm_hw_init(hw);
592
593 /* first calculate min/max only for CPUs in the DAI link */
594 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
595
596 /*
597 * Skip CPUs which don't support the current stream type.
598 * Otherwise, since the rate, channel, and format values will
599 * zero in that case, we would have no usable settings left,
600 * causing the resulting setup to fail.
601 */
602 if (!snd_soc_dai_stream_valid(cpu_dai, stream))
603 continue;
604
605 cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
606
607 soc_pcm_hw_update_chan(hw, cpu_stream);
608 soc_pcm_hw_update_rate(hw, cpu_stream);
609 soc_pcm_hw_update_format(hw, cpu_stream);
610 soc_pcm_hw_update_subformat(hw, cpu_stream);
611 }
612 cpu_chan_min = hw->channels_min;
613 cpu_chan_max = hw->channels_max;
614
615 /* second calculate min/max only for CODECs in the DAI link */
616 for_each_rtd_codec_dais(rtd, i, codec_dai) {
617
618 /*
619 * Skip CODECs which don't support the current stream type.
620 * Otherwise, since the rate, channel, and format values will
621 * zero in that case, we would have no usable settings left,
622 * causing the resulting setup to fail.
623 */
624 if (!snd_soc_dai_stream_valid(codec_dai, stream))
625 continue;
626
627 codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
628
629 soc_pcm_hw_update_chan(hw, codec_stream);
630 soc_pcm_hw_update_rate(hw, codec_stream);
631 soc_pcm_hw_update_format(hw, codec_stream);
632 soc_pcm_hw_update_subformat(hw, codec_stream);
633 }
634
635 /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
636 if (!hw->channels_min)
637 return -EINVAL;
638
639 /*
640 * chan min/max cannot be enforced if there are multiple CODEC DAIs
641 * connected to CPU DAI(s), use CPU DAI's directly and let
642 * channel allocation be fixed up later
643 */
644 if (rtd->dai_link->num_codecs > 1) {
645 hw->channels_min = cpu_chan_min;
646 hw->channels_max = cpu_chan_max;
647 }
648
649 return 0;
650 }
651 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
652
653 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
654 {
655 struct snd_pcm_hardware *hw = &substream->runtime->hw;
656 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
657 u64 formats = hw->formats;
658
659 /*
660 * At least one CPU and one CODEC should match. Otherwise, we should
661 * have bailed out on a higher level, since there would be no CPU or
662 * CODEC to support the transfer direction in that case.
663 */
664 snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
665
666 if (formats)
667 hw->formats &= formats;
668 }
669
670 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
671 {
672 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
673 struct snd_soc_component *component;
674 int i, ret = 0;
675
676 for_each_rtd_components(rtd, i, component) {
677 ret = snd_soc_component_module_get_when_open(component, substream);
678 if (ret < 0)
679 break;
680
681 ret = snd_soc_component_open(component, substream);
682 if (ret < 0)
683 break;
684 }
685
686 return ret;
687 }
688
689 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
690 int rollback)
691 {
692 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
693 struct snd_soc_component *component;
694 int i, ret = 0;
695
696 for_each_rtd_components(rtd, i, component) {
697 int r = snd_soc_component_close(component, substream, rollback);
698 if (r < 0)
699 ret = r; /* use last ret */
700
701 snd_soc_component_module_put_when_close(component, substream, rollback);
702 }
703
704 return ret;
705 }
706
707 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
708 struct snd_pcm_substream *substream, int rollback)
709 {
710 struct snd_soc_component *component;
711 struct snd_soc_dai *dai;
712 int i;
713
714 snd_soc_dpcm_mutex_assert_held(rtd);
715
716 if (!rollback) {
717 snd_soc_runtime_deactivate(rtd, substream->stream);
718
719 /* Make sure DAI parameters cleared if the DAI becomes inactive */
720 for_each_rtd_dais(rtd, i, dai) {
721 if (snd_soc_dai_active(dai) == 0 &&
722 (dai->rate || dai->channels || dai->sample_bits))
723 soc_pcm_set_dai_params(dai, NULL);
724 }
725 }
726
727 for_each_rtd_dais_reverse(rtd, i, dai)
728 snd_soc_dai_shutdown(dai, substream, rollback);
729
730 snd_soc_link_shutdown(substream, rollback);
731
732 soc_pcm_components_close(substream, rollback);
733
734 snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
735
736 for_each_rtd_components(rtd, i, component)
737 if (!snd_soc_component_active(component))
738 pinctrl_pm_select_sleep_state(component->dev);
739
740 return 0;
741 }
742
743 /*
744 * Called by ALSA when a PCM substream is closed. Private data can be
745 * freed here. The cpu DAI, codec DAI, machine and components are also
746 * shutdown.
747 */
748 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
749 struct snd_pcm_substream *substream)
750 {
751 return soc_pcm_clean(rtd, substream, 0);
752 }
753
754 /* PCM close ops for non-DPCM streams */
755 static int soc_pcm_close(struct snd_pcm_substream *substream)
756 {
757 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
758
759 snd_soc_dpcm_mutex_lock(rtd);
760 __soc_pcm_close(rtd, substream);
761 snd_soc_dpcm_mutex_unlock(rtd);
762 return 0;
763 }
764
765 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
766 {
767 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
768 struct snd_pcm_hardware *hw = &substream->runtime->hw;
769 const char *name_cpu = soc_cpu_dai_name(rtd);
770 const char *name_codec = soc_codec_dai_name(rtd);
771 const char *err_msg;
772 struct device *dev = rtd->dev;
773
774 err_msg = "rates";
775 if (!hw->rates)
776 goto config_err;
777
778 err_msg = "formats";
779 if (!hw->formats)
780 goto config_err;
781
782 err_msg = "channels";
783 if (!hw->channels_min || !hw->channels_max ||
784 hw->channels_min > hw->channels_max)
785 goto config_err;
786
787 dev_dbg(dev, "ASoC: %s <-> %s info:\n", name_codec,
788 name_cpu);
789 dev_dbg(dev, "ASoC: rate mask 0x%x\n", hw->rates);
790 dev_dbg(dev, "ASoC: ch min %d max %d\n", hw->channels_min,
791 hw->channels_max);
792 dev_dbg(dev, "ASoC: rate min %d max %d\n", hw->rate_min,
793 hw->rate_max);
794
795 return 0;
796
797 config_err:
798 dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
799 name_codec, name_cpu, err_msg);
800 return -EINVAL;
801 }
802
803 /*
804 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
805 * then initialized and any private data can be allocated. This also calls
806 * startup for the cpu DAI, component, machine and codec DAI.
807 */
808 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
809 struct snd_pcm_substream *substream)
810 {
811 struct snd_soc_component *component;
812 struct snd_soc_dai *dai;
813 int i, ret = 0;
814
815 snd_soc_dpcm_mutex_assert_held(rtd);
816
817 for_each_rtd_components(rtd, i, component)
818 pinctrl_pm_select_default_state(component->dev);
819
820 ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
821 if (ret < 0)
822 goto err;
823
824 ret = soc_pcm_components_open(substream);
825 if (ret < 0)
826 goto err;
827
828 ret = snd_soc_link_startup(substream);
829 if (ret < 0)
830 goto err;
831
832 /* startup the audio subsystem */
833 for_each_rtd_dais(rtd, i, dai) {
834 ret = snd_soc_dai_startup(dai, substream);
835 if (ret < 0)
836 goto err;
837 }
838
839 /* Dynamic PCM DAI links compat checks use dynamic capabilities */
840 if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
841 goto dynamic;
842
843 /* Check that the codec and cpu DAIs are compatible */
844 soc_pcm_init_runtime_hw(substream);
845
846 soc_pcm_update_symmetry(substream);
847
848 ret = soc_hw_sanity_check(substream);
849 if (ret < 0)
850 goto err;
851
852 soc_pcm_apply_msb(substream);
853
854 /* Symmetry only applies if we've already got an active stream. */
855 for_each_rtd_dais(rtd, i, dai) {
856 ret = soc_pcm_apply_symmetry(substream, dai);
857 if (ret != 0)
858 goto err;
859 }
860 dynamic:
861 snd_soc_runtime_activate(rtd, substream->stream);
862 ret = 0;
863 err:
864 if (ret < 0)
865 soc_pcm_clean(rtd, substream, 1);
866
867 return soc_pcm_ret(rtd, ret);
868 }
869
870 /* PCM open ops for non-DPCM streams */
871 static int soc_pcm_open(struct snd_pcm_substream *substream)
872 {
873 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
874 int ret;
875
876 snd_soc_dpcm_mutex_lock(rtd);
877 ret = __soc_pcm_open(rtd, substream);
878 snd_soc_dpcm_mutex_unlock(rtd);
879 return ret;
880 }
881
882 /*
883 * Called by ALSA when the PCM substream is prepared, can set format, sample
884 * rate, etc. This function is non atomic and can be called multiple times,
885 * it can refer to the runtime info.
886 */
887 static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
888 struct snd_pcm_substream *substream)
889 {
890 struct snd_soc_dai *dai;
891 int i, ret = 0;
892
893 snd_soc_dpcm_mutex_assert_held(rtd);
894
895 ret = snd_soc_link_prepare(substream);
896 if (ret < 0)
897 goto out;
898
899 ret = snd_soc_pcm_component_prepare(substream);
900 if (ret < 0)
901 goto out;
902
903 ret = snd_soc_pcm_dai_prepare(substream);
904 if (ret < 0)
905 goto out;
906
907 /* cancel any delayed stream shutdown that is pending */
908 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
909 rtd->pop_wait) {
910 rtd->pop_wait = 0;
911 cancel_delayed_work(&rtd->delayed_work);
912 }
913
914 snd_soc_dapm_stream_event(rtd, substream->stream,
915 SND_SOC_DAPM_STREAM_START);
916
917 for_each_rtd_dais(rtd, i, dai) {
918 if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
919 snd_soc_dai_digital_mute(dai, 0, substream->stream);
920 }
921
922 out:
923 return soc_pcm_ret(rtd, ret);
924 }
925
926 /* PCM prepare ops for non-DPCM streams */
927 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
928 {
929 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
930 int ret;
931
932 snd_soc_dpcm_mutex_lock(rtd);
933 ret = __soc_pcm_prepare(rtd, substream);
934 snd_soc_dpcm_mutex_unlock(rtd);
935 return ret;
936 }
937
938 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
939 unsigned int mask)
940 {
941 struct snd_interval *interval;
942 int channels = hweight_long(mask);
943
944 interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
945 interval->min = channels;
946 interval->max = channels;
947 }
948
949 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
950 struct snd_pcm_substream *substream, int rollback)
951 {
952 struct snd_soc_dai *dai;
953 int i;
954
955 snd_soc_dpcm_mutex_assert_held(rtd);
956
957 /* clear the corresponding DAIs parameters when going to be inactive */
958 for_each_rtd_dais(rtd, i, dai) {
959 if (snd_soc_dai_active(dai) == 1)
960 soc_pcm_set_dai_params(dai, NULL);
961
962 if (snd_soc_dai_stream_active(dai, substream->stream) == 1) {
963 if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
964 snd_soc_dai_digital_mute(dai, 1, substream->stream);
965 }
966 }
967
968 /* run the stream event */
969 snd_soc_dapm_stream_stop(rtd, substream->stream);
970
971 /* free any machine hw params */
972 snd_soc_link_hw_free(substream, rollback);
973
974 /* free any component resources */
975 snd_soc_pcm_component_hw_free(substream, rollback);
976
977 /* now free hw params for the DAIs */
978 for_each_rtd_dais(rtd, i, dai)
979 if (snd_soc_dai_stream_valid(dai, substream->stream))
980 snd_soc_dai_hw_free(dai, substream, rollback);
981
982 return 0;
983 }
984
985 /*
986 * Frees resources allocated by hw_params, can be called multiple times
987 */
988 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
989 struct snd_pcm_substream *substream)
990 {
991 return soc_pcm_hw_clean(rtd, substream, 0);
992 }
993
994 /* hw_free PCM ops for non-DPCM streams */
995 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
996 {
997 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
998 int ret;
999
1000 snd_soc_dpcm_mutex_lock(rtd);
1001 ret = __soc_pcm_hw_free(rtd, substream);
1002 snd_soc_dpcm_mutex_unlock(rtd);
1003 return ret;
1004 }
1005
1006 /*
1007 * Called by ALSA when the hardware params are set by application. This
1008 * function can also be called multiple times and can allocate buffers
1009 * (using snd_pcm_lib_* ). It's non-atomic.
1010 */
1011 static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
1012 struct snd_pcm_substream *substream,
1013 struct snd_pcm_hw_params *params)
1014 {
1015 struct snd_soc_dai *cpu_dai;
1016 struct snd_soc_dai *codec_dai;
1017 struct snd_pcm_hw_params tmp_params;
1018 int i, ret = 0;
1019
1020 snd_soc_dpcm_mutex_assert_held(rtd);
1021
1022 ret = soc_pcm_params_symmetry(substream, params);
1023 if (ret)
1024 goto out;
1025
1026 ret = snd_soc_link_hw_params(substream, params);
1027 if (ret < 0)
1028 goto out;
1029
1030 for_each_rtd_codec_dais(rtd, i, codec_dai) {
1031 unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
1032
1033 /*
1034 * Skip CODECs which don't support the current stream type,
1035 * the idea being that if a CODEC is not used for the currently
1036 * set up transfer direction, it should not need to be
1037 * configured, especially since the configuration used might
1038 * not even be supported by that CODEC. There may be cases
1039 * however where a CODEC needs to be set up although it is
1040 * actually not being used for the transfer, e.g. if a
1041 * capture-only CODEC is acting as an LRCLK and/or BCLK master
1042 * for the DAI link including a playback-only CODEC.
1043 * If this becomes necessary, we will have to augment the
1044 * machine driver setup with information on how to act, so
1045 * we can do the right thing here.
1046 */
1047 if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
1048 continue;
1049
1050 /* copy params for each codec */
1051 tmp_params = *params;
1052
1053 /* fixup params based on TDM slot masks */
1054 if (tdm_mask)
1055 soc_pcm_codec_params_fixup(&tmp_params, tdm_mask);
1056
1057 ret = snd_soc_dai_hw_params(codec_dai, substream,
1058 &tmp_params);
1059 if(ret < 0)
1060 goto out;
1061
1062 soc_pcm_set_dai_params(codec_dai, &tmp_params);
1063 snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai);
1064 }
1065
1066 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
1067 struct snd_soc_dai_link_ch_map *ch_maps;
1068 unsigned int ch_mask = 0;
1069 int j;
1070
1071 /*
1072 * Skip CPUs which don't support the current stream
1073 * type. See soc_pcm_init_runtime_hw() for more details
1074 */
1075 if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
1076 continue;
1077
1078 /* copy params for each cpu */
1079 tmp_params = *params;
1080
1081 /*
1082 * construct cpu channel mask by combining ch_mask of each
1083 * codec which maps to the cpu.
1084 * see
1085 * soc.h :: [dai_link->ch_maps Image sample]
1086 */
1087 for_each_rtd_ch_maps(rtd, j, ch_maps)
1088 if (ch_maps->cpu == i)
1089 ch_mask |= ch_maps->ch_mask;
1090
1091 /* fixup cpu channel number */
1092 if (ch_mask)
1093 soc_pcm_codec_params_fixup(&tmp_params, ch_mask);
1094
1095 ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params);
1096 if (ret < 0)
1097 goto out;
1098
1099 /* store the parameters for each DAI */
1100 soc_pcm_set_dai_params(cpu_dai, &tmp_params);
1101 snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai);
1102 }
1103
1104 ret = snd_soc_pcm_component_hw_params(substream, params);
1105 out:
1106 if (ret < 0)
1107 soc_pcm_hw_clean(rtd, substream, 1);
1108
1109 return soc_pcm_ret(rtd, ret);
1110 }
1111
1112 /* hw_params PCM ops for non-DPCM streams */
1113 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
1114 struct snd_pcm_hw_params *params)
1115 {
1116 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1117 int ret;
1118
1119 snd_soc_dpcm_mutex_lock(rtd);
1120 ret = __soc_pcm_hw_params(rtd, substream, params);
1121 snd_soc_dpcm_mutex_unlock(rtd);
1122 return ret;
1123 }
1124
1125 #define TRIGGER_MAX 3
1126 static int (* const trigger[][TRIGGER_MAX])(struct snd_pcm_substream *substream, int cmd, int rollback) = {
1127 [SND_SOC_TRIGGER_ORDER_DEFAULT] = {
1128 snd_soc_link_trigger,
1129 snd_soc_pcm_component_trigger,
1130 snd_soc_pcm_dai_trigger,
1131 },
1132 [SND_SOC_TRIGGER_ORDER_LDC] = {
1133 snd_soc_link_trigger,
1134 snd_soc_pcm_dai_trigger,
1135 snd_soc_pcm_component_trigger,
1136 },
1137 };
1138
1139 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
1140 {
1141 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
1142 struct snd_soc_component *component;
1143 int ret = 0, r = 0, i;
1144 int rollback = 0;
1145 int start = 0, stop = 0;
1146
1147 /*
1148 * select START/STOP sequence
1149 */
1150 for_each_rtd_components(rtd, i, component) {
1151 if (component->driver->trigger_start)
1152 start = component->driver->trigger_start;
1153 if (component->driver->trigger_stop)
1154 stop = component->driver->trigger_stop;
1155 }
1156 if (rtd->dai_link->trigger_start)
1157 start = rtd->dai_link->trigger_start;
1158 if (rtd->dai_link->trigger_stop)
1159 stop = rtd->dai_link->trigger_stop;
1160
1161 if (start < 0 || start >= SND_SOC_TRIGGER_ORDER_MAX ||
1162 stop < 0 || stop >= SND_SOC_TRIGGER_ORDER_MAX)
1163 return -EINVAL;
1164
1165 /*
1166 * START
1167 */
1168 switch (cmd) {
1169 case SNDRV_PCM_TRIGGER_START:
1170 case SNDRV_PCM_TRIGGER_RESUME:
1171 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1172 for (i = 0; i < TRIGGER_MAX; i++) {
1173 r = trigger[start][i](substream, cmd, 0);
1174 if (r < 0)
1175 break;
1176 }
1177 }
1178
1179 /*
1180 * Rollback if START failed
1181 * find correspond STOP command
1182 */
1183 if (r < 0) {
1184 rollback = 1;
1185 ret = r;
1186 switch (cmd) {
1187 case SNDRV_PCM_TRIGGER_START:
1188 cmd = SNDRV_PCM_TRIGGER_STOP;
1189 break;
1190 case SNDRV_PCM_TRIGGER_RESUME:
1191 cmd = SNDRV_PCM_TRIGGER_SUSPEND;
1192 break;
1193 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1194 cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
1195 break;
1196 }
1197 }
1198
1199 /*
1200 * STOP
1201 */
1202 switch (cmd) {
1203 case SNDRV_PCM_TRIGGER_STOP:
1204 case SNDRV_PCM_TRIGGER_SUSPEND:
1205 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1206 for (i = TRIGGER_MAX; i > 0; i--) {
1207 r = trigger[stop][i - 1](substream, cmd, rollback);
1208 if (r < 0)
1209 ret = r;
1210 }
1211 }
1212
1213 return ret;
1214 }
1215
1216 /*
1217 * soc level wrapper for pointer callback
1218 * If cpu_dai, codec_dai, component driver has the delay callback, then
1219 * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
1220 */
1221 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1222 {
1223 struct snd_pcm_runtime *runtime = substream->runtime;
1224 snd_pcm_uframes_t offset = 0;
1225 snd_pcm_sframes_t codec_delay = 0;
1226 snd_pcm_sframes_t cpu_delay = 0;
1227
1228 offset = snd_soc_pcm_component_pointer(substream);
1229
1230 /* should be called *after* snd_soc_pcm_component_pointer() */
1231 snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
1232 snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
1233
1234 runtime->delay = cpu_delay + codec_delay;
1235
1236 return offset;
1237 }
1238
1239 /* connect a FE and BE */
1240 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1241 struct snd_soc_pcm_runtime *be, int stream)
1242 {
1243 struct snd_pcm_substream *fe_substream;
1244 struct snd_pcm_substream *be_substream;
1245 struct snd_soc_dpcm *dpcm;
1246
1247 snd_soc_dpcm_mutex_assert_held(fe);
1248
1249 /* only add new dpcms */
1250 for_each_dpcm_be(fe, stream, dpcm) {
1251 if (dpcm->be == be && dpcm->fe == fe)
1252 return 0;
1253 }
1254
1255 fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1256 be_substream = snd_soc_dpcm_get_substream(be, stream);
1257
1258 if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
1259 dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
1260 __func__);
1261 return -EINVAL;
1262 }
1263 if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
1264 dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
1265 be_substream->pcm->nonatomic = 1;
1266 }
1267
1268 dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1269 if (!dpcm)
1270 return -ENOMEM;
1271
1272 dpcm->be = be;
1273 dpcm->fe = fe;
1274 dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1275 snd_soc_dpcm_stream_lock_irq(fe, stream);
1276 list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1277 list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1278 snd_soc_dpcm_stream_unlock_irq(fe, stream);
1279
1280 dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1281 stream ? "capture" : "playback", fe->dai_link->name,
1282 stream ? "<-" : "->", be->dai_link->name);
1283
1284 dpcm_create_debugfs_state(dpcm, stream);
1285
1286 return 1;
1287 }
1288
1289 /* reparent a BE onto another FE */
1290 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1291 struct snd_soc_pcm_runtime *be, int stream)
1292 {
1293 struct snd_soc_dpcm *dpcm;
1294 struct snd_pcm_substream *fe_substream, *be_substream;
1295
1296 /* reparent if BE is connected to other FEs */
1297 if (!be->dpcm[stream].users)
1298 return;
1299
1300 be_substream = snd_soc_dpcm_get_substream(be, stream);
1301 if (!be_substream)
1302 return;
1303
1304 for_each_dpcm_fe(be, stream, dpcm) {
1305 if (dpcm->fe == fe)
1306 continue;
1307
1308 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1309 stream ? "capture" : "playback",
1310 dpcm->fe->dai_link->name,
1311 stream ? "<-" : "->", dpcm->be->dai_link->name);
1312
1313 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1314 be_substream->runtime = fe_substream->runtime;
1315 break;
1316 }
1317 }
1318
1319 /* disconnect a BE and FE */
1320 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1321 {
1322 struct snd_soc_dpcm *dpcm, *d;
1323 LIST_HEAD(deleted_dpcms);
1324
1325 snd_soc_dpcm_mutex_assert_held(fe);
1326
1327 snd_soc_dpcm_stream_lock_irq(fe, stream);
1328 for_each_dpcm_be_safe(fe, stream, dpcm, d) {
1329 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1330 stream ? "capture" : "playback",
1331 dpcm->be->dai_link->name);
1332
1333 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1334 continue;
1335
1336 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1337 stream ? "capture" : "playback", fe->dai_link->name,
1338 stream ? "<-" : "->", dpcm->be->dai_link->name);
1339
1340 /* BEs still alive need new FE */
1341 dpcm_be_reparent(fe, dpcm->be, stream);
1342
1343 list_del(&dpcm->list_be);
1344 list_move(&dpcm->list_fe, &deleted_dpcms);
1345 }
1346 snd_soc_dpcm_stream_unlock_irq(fe, stream);
1347
1348 while (!list_empty(&deleted_dpcms)) {
1349 dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
1350 list_fe);
1351 list_del(&dpcm->list_fe);
1352 dpcm_remove_debugfs_state(dpcm);
1353 kfree(dpcm);
1354 }
1355 }
1356
1357 /* get BE for DAI widget and stream */
1358 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1359 struct snd_soc_dapm_widget *widget, int stream)
1360 {
1361 struct snd_soc_pcm_runtime *be;
1362 struct snd_soc_dapm_widget *w;
1363 struct snd_soc_dai *dai;
1364 int i;
1365
1366 dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
1367
1368 for_each_card_rtds(card, be) {
1369
1370 if (!be->dai_link->no_pcm)
1371 continue;
1372
1373 if (!snd_soc_dpcm_get_substream(be, stream))
1374 continue;
1375
1376 for_each_rtd_dais(be, i, dai) {
1377 w = snd_soc_dai_get_widget(dai, stream);
1378
1379 dev_dbg(card->dev, "ASoC: try BE : %s\n",
1380 w ? w->name : "(not set)");
1381
1382 if (w == widget)
1383 return be;
1384 }
1385 }
1386
1387 /* Widget provided is not a BE */
1388 return NULL;
1389 }
1390
1391 int widget_in_list(struct snd_soc_dapm_widget_list *list,
1392 struct snd_soc_dapm_widget *widget)
1393 {
1394 struct snd_soc_dapm_widget *w;
1395 int i;
1396
1397 for_each_dapm_widgets(list, i, w)
1398 if (widget == w)
1399 return 1;
1400
1401 return 0;
1402 }
1403 EXPORT_SYMBOL_GPL(widget_in_list);
1404
1405 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
1406 {
1407 struct snd_soc_card *card = widget->dapm->card;
1408 struct snd_soc_pcm_runtime *rtd;
1409 int stream;
1410
1411 /* adjust dir to stream */
1412 if (dir == SND_SOC_DAPM_DIR_OUT)
1413 stream = SNDRV_PCM_STREAM_PLAYBACK;
1414 else
1415 stream = SNDRV_PCM_STREAM_CAPTURE;
1416
1417 rtd = dpcm_get_be(card, widget, stream);
1418 if (rtd)
1419 return true;
1420
1421 return false;
1422 }
1423 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
1424
1425 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1426 int stream, struct snd_soc_dapm_widget_list **list)
1427 {
1428 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(fe, 0);
1429 int paths;
1430
1431 if (fe->dai_link->num_cpus > 1) {
1432 dev_err(fe->dev,
1433 "%s doesn't support Multi CPU yet\n", __func__);
1434 return -EINVAL;
1435 }
1436
1437 /* get number of valid DAI paths and their widgets */
1438 paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
1439 fe->card->component_chaining ?
1440 NULL : dpcm_end_walk_at_be);
1441
1442 if (paths > 0)
1443 dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1444 stream ? "capture" : "playback");
1445 else if (paths == 0)
1446 dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
1447 stream ? "capture" : "playback");
1448
1449 return paths;
1450 }
1451
1452 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
1453 {
1454 snd_soc_dapm_dai_free_widgets(list);
1455 }
1456
1457 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
1458 struct snd_soc_dapm_widget_list *list)
1459 {
1460 struct snd_soc_dai *dai;
1461 unsigned int i;
1462
1463 /* is there a valid DAI widget for this BE */
1464 for_each_rtd_dais(dpcm->be, i, dai) {
1465 struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
1466
1467 /*
1468 * The BE is pruned only if none of the dai
1469 * widgets are in the active list.
1470 */
1471 if (widget && widget_in_list(list, widget))
1472 return true;
1473 }
1474
1475 return false;
1476 }
1477
1478 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1479 struct snd_soc_dapm_widget_list **list_)
1480 {
1481 struct snd_soc_dpcm *dpcm;
1482 int prune = 0;
1483
1484 /* Destroy any old FE <--> BE connections */
1485 for_each_dpcm_be(fe, stream, dpcm) {
1486 if (dpcm_be_is_active(dpcm, stream, *list_))
1487 continue;
1488
1489 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1490 stream ? "capture" : "playback",
1491 dpcm->be->dai_link->name, fe->dai_link->name);
1492 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1493 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
1494 prune++;
1495 }
1496
1497 dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1498 return prune;
1499 }
1500
1501 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1502 struct snd_soc_dapm_widget_list **list_)
1503 {
1504 struct snd_soc_card *card = fe->card;
1505 struct snd_soc_dapm_widget_list *list = *list_;
1506 struct snd_soc_pcm_runtime *be;
1507 struct snd_soc_dapm_widget *widget;
1508 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1509 int i, new = 0, err;
1510
1511 /* don't connect if FE is not running */
1512 if (!fe_substream->runtime && !fe->fe_compr)
1513 return new;
1514
1515 /* Create any new FE <--> BE connections */
1516 for_each_dapm_widgets(list, i, widget) {
1517
1518 switch (widget->id) {
1519 case snd_soc_dapm_dai_in:
1520 if (stream != SNDRV_PCM_STREAM_PLAYBACK)
1521 continue;
1522 break;
1523 case snd_soc_dapm_dai_out:
1524 if (stream != SNDRV_PCM_STREAM_CAPTURE)
1525 continue;
1526 break;
1527 default:
1528 continue;
1529 }
1530
1531 /* is there a valid BE rtd for this widget */
1532 be = dpcm_get_be(card, widget, stream);
1533 if (!be) {
1534 dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
1535 widget->name);
1536 continue;
1537 }
1538
1539 /*
1540 * Filter for systems with 'component_chaining' enabled.
1541 * This helps to avoid unnecessary re-configuration of an
1542 * already active BE on such systems.
1543 */
1544 if (fe->card->component_chaining &&
1545 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1546 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1547 continue;
1548
1549 /* newly connected FE and BE */
1550 err = dpcm_be_connect(fe, be, stream);
1551 if (err < 0) {
1552 dev_err(fe->dev, "ASoC: can't connect %s\n",
1553 widget->name);
1554 break;
1555 } else if (err == 0) /* already connected */
1556 continue;
1557
1558 /* new */
1559 dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
1560 new++;
1561 }
1562
1563 dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1564 return new;
1565 }
1566
1567 /*
1568 * Find the corresponding BE DAIs that source or sink audio to this
1569 * FE substream.
1570 */
1571 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1572 int stream, struct snd_soc_dapm_widget_list **list, int new)
1573 {
1574 if (new)
1575 return dpcm_add_paths(fe, stream, list);
1576 else
1577 return dpcm_prune_paths(fe, stream, list);
1578 }
1579
1580 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1581 {
1582 struct snd_soc_dpcm *dpcm;
1583
1584 for_each_dpcm_be(fe, stream, dpcm)
1585 dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
1586 }
1587
1588 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
1589 int do_hw_free, struct snd_soc_dpcm *last)
1590 {
1591 struct snd_soc_dpcm *dpcm;
1592
1593 /* disable any enabled and non active backends */
1594 for_each_dpcm_be(fe, stream, dpcm) {
1595 struct snd_soc_pcm_runtime *be = dpcm->be;
1596 struct snd_pcm_substream *be_substream =
1597 snd_soc_dpcm_get_substream(be, stream);
1598
1599 if (dpcm == last)
1600 return;
1601
1602 /* is this op for this BE ? */
1603 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1604 continue;
1605
1606 if (be->dpcm[stream].users == 0) {
1607 dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1608 stream ? "capture" : "playback",
1609 be->dpcm[stream].state);
1610 continue;
1611 }
1612
1613 if (--be->dpcm[stream].users != 0)
1614 continue;
1615
1616 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
1617 if (!do_hw_free)
1618 continue;
1619
1620 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
1621 __soc_pcm_hw_free(be, be_substream);
1622 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1623 }
1624 }
1625
1626 __soc_pcm_close(be, be_substream);
1627 be_substream->runtime = NULL;
1628 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1629 }
1630 }
1631
1632 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1633 {
1634 struct snd_pcm_substream *fe_substream = snd_soc_dpcm_get_substream(fe, stream);
1635 struct snd_soc_pcm_runtime *be;
1636 struct snd_soc_dpcm *dpcm;
1637 int err, count = 0;
1638
1639 /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1640 for_each_dpcm_be(fe, stream, dpcm) {
1641 struct snd_pcm_substream *be_substream;
1642
1643 be = dpcm->be;
1644 be_substream = snd_soc_dpcm_get_substream(be, stream);
1645
1646 if (!be_substream) {
1647 dev_err(be->dev, "ASoC: no backend %s stream\n",
1648 stream ? "capture" : "playback");
1649 continue;
1650 }
1651
1652 /* is this op for this BE ? */
1653 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1654 continue;
1655
1656 /* first time the dpcm is open ? */
1657 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
1658 dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1659 stream ? "capture" : "playback",
1660 be->dpcm[stream].state);
1661 continue;
1662 }
1663
1664 if (be->dpcm[stream].users++ != 0)
1665 continue;
1666
1667 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1668 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1669 continue;
1670
1671 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1672 stream ? "capture" : "playback", be->dai_link->name);
1673
1674 be_substream->runtime = fe_substream->runtime;
1675 err = __soc_pcm_open(be, be_substream);
1676 if (err < 0) {
1677 be->dpcm[stream].users--;
1678 if (be->dpcm[stream].users < 0)
1679 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1680 stream ? "capture" : "playback",
1681 be->dpcm[stream].state);
1682
1683 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1684 goto unwind;
1685 }
1686 be->dpcm[stream].be_start = 0;
1687 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1688 count++;
1689 }
1690
1691 return count;
1692
1693 unwind:
1694 dpcm_be_dai_startup_rollback(fe, stream, dpcm);
1695
1696 return soc_pcm_ret(fe, err);
1697 }
1698
1699 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
1700 {
1701 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1702 struct snd_pcm_runtime *runtime = substream->runtime;
1703 struct snd_pcm_hardware *hw = &runtime->hw;
1704 struct snd_soc_dai *dai;
1705 int stream = substream->stream;
1706 u64 formats = hw->formats;
1707 int i;
1708
1709 soc_pcm_hw_init(hw);
1710
1711 if (formats)
1712 hw->formats &= formats;
1713
1714 for_each_rtd_cpu_dais(fe, i, dai) {
1715 const struct snd_soc_pcm_stream *cpu_stream;
1716
1717 /*
1718 * Skip CPUs which don't support the current stream
1719 * type. See soc_pcm_init_runtime_hw() for more details
1720 */
1721 if (!snd_soc_dai_stream_valid(dai, stream))
1722 continue;
1723
1724 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1725
1726 soc_pcm_hw_update_rate(hw, cpu_stream);
1727 soc_pcm_hw_update_chan(hw, cpu_stream);
1728 soc_pcm_hw_update_format(hw, cpu_stream);
1729 soc_pcm_hw_update_subformat(hw, cpu_stream);
1730 }
1731
1732 }
1733
1734 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
1735 {
1736 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1737 struct snd_pcm_runtime *runtime = substream->runtime;
1738 struct snd_pcm_hardware *hw = &runtime->hw;
1739 struct snd_soc_dpcm *dpcm;
1740 struct snd_soc_dai *dai;
1741 int stream = substream->stream;
1742
1743 if (!fe->dai_link->dpcm_merged_format)
1744 return;
1745
1746 /*
1747 * It returns merged BE codec format
1748 * if FE want to use it (= dpcm_merged_format)
1749 */
1750
1751 for_each_dpcm_be(fe, stream, dpcm) {
1752 struct snd_soc_pcm_runtime *be = dpcm->be;
1753 const struct snd_soc_pcm_stream *codec_stream;
1754 int i;
1755
1756 for_each_rtd_codec_dais(be, i, dai) {
1757 /*
1758 * Skip CODECs which don't support the current stream
1759 * type. See soc_pcm_init_runtime_hw() for more details
1760 */
1761 if (!snd_soc_dai_stream_valid(dai, stream))
1762 continue;
1763
1764 codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1765
1766 soc_pcm_hw_update_format(hw, codec_stream);
1767 soc_pcm_hw_update_subformat(hw, codec_stream);
1768 }
1769 }
1770 }
1771
1772 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
1773 {
1774 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1775 struct snd_pcm_runtime *runtime = substream->runtime;
1776 struct snd_pcm_hardware *hw = &runtime->hw;
1777 struct snd_soc_dpcm *dpcm;
1778 int stream = substream->stream;
1779
1780 if (!fe->dai_link->dpcm_merged_chan)
1781 return;
1782
1783 /*
1784 * It returns merged BE codec channel;
1785 * if FE want to use it (= dpcm_merged_chan)
1786 */
1787
1788 for_each_dpcm_be(fe, stream, dpcm) {
1789 struct snd_soc_pcm_runtime *be = dpcm->be;
1790 const struct snd_soc_pcm_stream *cpu_stream;
1791 struct snd_soc_dai *dai;
1792 int i;
1793
1794 for_each_rtd_cpu_dais(be, i, dai) {
1795 /*
1796 * Skip CPUs which don't support the current stream
1797 * type. See soc_pcm_init_runtime_hw() for more details
1798 */
1799 if (!snd_soc_dai_stream_valid(dai, stream))
1800 continue;
1801
1802 cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
1803
1804 soc_pcm_hw_update_chan(hw, cpu_stream);
1805 }
1806
1807 /*
1808 * chan min/max cannot be enforced if there are multiple CODEC
1809 * DAIs connected to a single CPU DAI, use CPU DAI's directly
1810 */
1811 if (be->dai_link->num_codecs == 1) {
1812 const struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
1813 snd_soc_rtd_to_codec(be, 0), stream);
1814
1815 soc_pcm_hw_update_chan(hw, codec_stream);
1816 }
1817 }
1818 }
1819
1820 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
1821 {
1822 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1823 struct snd_pcm_runtime *runtime = substream->runtime;
1824 struct snd_pcm_hardware *hw = &runtime->hw;
1825 struct snd_soc_dpcm *dpcm;
1826 int stream = substream->stream;
1827
1828 if (!fe->dai_link->dpcm_merged_rate)
1829 return;
1830
1831 /*
1832 * It returns merged BE codec channel;
1833 * if FE want to use it (= dpcm_merged_chan)
1834 */
1835
1836 for_each_dpcm_be(fe, stream, dpcm) {
1837 struct snd_soc_pcm_runtime *be = dpcm->be;
1838 const struct snd_soc_pcm_stream *pcm;
1839 struct snd_soc_dai *dai;
1840 int i;
1841
1842 for_each_rtd_dais(be, i, dai) {
1843 /*
1844 * Skip DAIs which don't support the current stream
1845 * type. See soc_pcm_init_runtime_hw() for more details
1846 */
1847 if (!snd_soc_dai_stream_valid(dai, stream))
1848 continue;
1849
1850 pcm = snd_soc_dai_get_pcm_stream(dai, stream);
1851
1852 soc_pcm_hw_update_rate(hw, pcm);
1853 }
1854 }
1855 }
1856
1857 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
1858 int stream)
1859 {
1860 struct snd_soc_dpcm *dpcm;
1861 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1862 struct snd_soc_dai *fe_cpu_dai;
1863 int err = 0;
1864 int i;
1865
1866 /* apply symmetry for FE */
1867 soc_pcm_update_symmetry(fe_substream);
1868
1869 for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
1870 /* Symmetry only applies if we've got an active stream. */
1871 err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
1872 if (err < 0)
1873 goto error;
1874 }
1875
1876 /* apply symmetry for BE */
1877 for_each_dpcm_be(fe, stream, dpcm) {
1878 struct snd_soc_pcm_runtime *be = dpcm->be;
1879 struct snd_pcm_substream *be_substream =
1880 snd_soc_dpcm_get_substream(be, stream);
1881 struct snd_soc_pcm_runtime *rtd;
1882 struct snd_soc_dai *dai;
1883
1884 /* A backend may not have the requested substream */
1885 if (!be_substream)
1886 continue;
1887
1888 rtd = snd_soc_substream_to_rtd(be_substream);
1889 if (rtd->dai_link->be_hw_params_fixup)
1890 continue;
1891
1892 soc_pcm_update_symmetry(be_substream);
1893
1894 /* Symmetry only applies if we've got an active stream. */
1895 for_each_rtd_dais(rtd, i, dai) {
1896 err = soc_pcm_apply_symmetry(fe_substream, dai);
1897 if (err < 0)
1898 goto error;
1899 }
1900 }
1901 error:
1902 return soc_pcm_ret(fe, err);
1903 }
1904
1905 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1906 {
1907 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
1908 int stream = fe_substream->stream, ret = 0;
1909
1910 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1911
1912 ret = dpcm_be_dai_startup(fe, stream);
1913 if (ret < 0)
1914 goto be_err;
1915
1916 dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1917
1918 /* start the DAI frontend */
1919 ret = __soc_pcm_open(fe, fe_substream);
1920 if (ret < 0)
1921 goto unwind;
1922
1923 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1924
1925 dpcm_runtime_setup_fe(fe_substream);
1926
1927 dpcm_runtime_setup_be_format(fe_substream);
1928 dpcm_runtime_setup_be_chan(fe_substream);
1929 dpcm_runtime_setup_be_rate(fe_substream);
1930
1931 ret = dpcm_apply_symmetry(fe_substream, stream);
1932
1933 unwind:
1934 if (ret < 0)
1935 dpcm_be_dai_startup_unwind(fe, stream);
1936 be_err:
1937 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1938
1939 return soc_pcm_ret(fe, ret);
1940 }
1941
1942 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1943 {
1944 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
1945 int stream = substream->stream;
1946
1947 snd_soc_dpcm_mutex_assert_held(fe);
1948
1949 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1950
1951 /* shutdown the BEs */
1952 dpcm_be_dai_shutdown(fe, stream);
1953
1954 dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1955
1956 /* now shutdown the frontend */
1957 __soc_pcm_close(fe, substream);
1958
1959 /* run the stream stop event */
1960 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1961
1962 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1963 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1964 return 0;
1965 }
1966
1967 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1968 {
1969 struct snd_soc_dpcm *dpcm;
1970
1971 /* only hw_params backends that are either sinks or sources
1972 * to this frontend DAI */
1973 for_each_dpcm_be(fe, stream, dpcm) {
1974
1975 struct snd_soc_pcm_runtime *be = dpcm->be;
1976 struct snd_pcm_substream *be_substream =
1977 snd_soc_dpcm_get_substream(be, stream);
1978
1979 /* is this op for this BE ? */
1980 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1981 continue;
1982
1983 /* only free hw when no longer used - check all FEs */
1984 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1985 continue;
1986
1987 /* do not free hw if this BE is used by other FE */
1988 if (be->dpcm[stream].users > 1)
1989 continue;
1990
1991 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1992 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1993 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1994 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1995 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
1996 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1997 continue;
1998
1999 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
2000 be->dai_link->name);
2001
2002 __soc_pcm_hw_free(be, be_substream);
2003
2004 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2005 }
2006 }
2007
2008 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
2009 {
2010 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2011 int stream = substream->stream;
2012
2013 snd_soc_dpcm_mutex_lock(fe);
2014 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2015
2016 dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
2017
2018 /* call hw_free on the frontend */
2019 soc_pcm_hw_clean(fe, substream, 0);
2020
2021 /* only hw_params backends that are either sinks or sources
2022 * to this frontend DAI */
2023 dpcm_be_dai_hw_free(fe, stream);
2024
2025 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
2026 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2027
2028 snd_soc_dpcm_mutex_unlock(fe);
2029 return 0;
2030 }
2031
2032 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
2033 {
2034 struct snd_soc_pcm_runtime *be;
2035 struct snd_pcm_substream *be_substream;
2036 struct snd_soc_dpcm *dpcm;
2037 int ret;
2038
2039 for_each_dpcm_be(fe, stream, dpcm) {
2040 struct snd_pcm_hw_params hw_params;
2041
2042 be = dpcm->be;
2043 be_substream = snd_soc_dpcm_get_substream(be, stream);
2044
2045 /* is this op for this BE ? */
2046 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2047 continue;
2048
2049 /* copy params for each dpcm */
2050 memcpy(&hw_params, &fe->dpcm[stream].hw_params,
2051 sizeof(struct snd_pcm_hw_params));
2052
2053 /* perform any hw_params fixups */
2054 ret = snd_soc_link_be_hw_params_fixup(be, &hw_params);
2055 if (ret < 0)
2056 goto unwind;
2057
2058 /* copy the fixed-up hw params for BE dai */
2059 memcpy(&be->dpcm[stream].hw_params, &hw_params,
2060 sizeof(struct snd_pcm_hw_params));
2061
2062 /* only allow hw_params() if no connected FEs are running */
2063 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
2064 continue;
2065
2066 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2067 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2068 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
2069 continue;
2070
2071 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
2072 be->dai_link->name);
2073
2074 ret = __soc_pcm_hw_params(be, be_substream, &hw_params);
2075 if (ret < 0)
2076 goto unwind;
2077
2078 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2079 }
2080 return 0;
2081
2082 unwind:
2083 dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
2084 __func__, be->dai_link->name, ret);
2085
2086 /* disable any enabled and non active backends */
2087 for_each_dpcm_be_rollback(fe, stream, dpcm) {
2088 be = dpcm->be;
2089 be_substream = snd_soc_dpcm_get_substream(be, stream);
2090
2091 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2092 continue;
2093
2094 /* only allow hw_free() if no connected FEs are running */
2095 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
2096 continue;
2097
2098 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
2099 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2100 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
2101 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2102 continue;
2103
2104 __soc_pcm_hw_free(be, be_substream);
2105 }
2106
2107 return ret;
2108 }
2109
2110 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
2111 struct snd_pcm_hw_params *params)
2112 {
2113 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2114 int ret, stream = substream->stream;
2115
2116 snd_soc_dpcm_mutex_lock(fe);
2117 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2118
2119 memcpy(&fe->dpcm[stream].hw_params, params,
2120 sizeof(struct snd_pcm_hw_params));
2121 ret = dpcm_be_dai_hw_params(fe, stream);
2122 if (ret < 0)
2123 goto out;
2124
2125 dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
2126 fe->dai_link->name, params_rate(params),
2127 params_channels(params), params_format(params));
2128
2129 /* call hw_params on the frontend */
2130 ret = __soc_pcm_hw_params(fe, substream, params);
2131 if (ret < 0)
2132 dpcm_be_dai_hw_free(fe, stream);
2133 else
2134 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
2135
2136 out:
2137 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2138 snd_soc_dpcm_mutex_unlock(fe);
2139
2140 return soc_pcm_ret(fe, ret);
2141 }
2142
2143 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
2144 int cmd)
2145 {
2146 struct snd_soc_pcm_runtime *be;
2147 bool pause_stop_transition;
2148 struct snd_soc_dpcm *dpcm;
2149 unsigned long flags;
2150 int ret = 0;
2151
2152 for_each_dpcm_be(fe, stream, dpcm) {
2153 struct snd_pcm_substream *be_substream;
2154
2155 be = dpcm->be;
2156 be_substream = snd_soc_dpcm_get_substream(be, stream);
2157
2158 snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
2159
2160 /* is this op for this BE ? */
2161 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2162 goto next;
2163
2164 dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
2165 be->dai_link->name, cmd);
2166
2167 switch (cmd) {
2168 case SNDRV_PCM_TRIGGER_START:
2169 if (!be->dpcm[stream].be_start &&
2170 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
2171 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2172 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2173 goto next;
2174
2175 be->dpcm[stream].be_start++;
2176 if (be->dpcm[stream].be_start != 1)
2177 goto next;
2178
2179 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
2180 ret = soc_pcm_trigger(be_substream,
2181 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
2182 else
2183 ret = soc_pcm_trigger(be_substream,
2184 SNDRV_PCM_TRIGGER_START);
2185 if (ret) {
2186 be->dpcm[stream].be_start--;
2187 goto next;
2188 }
2189
2190 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2191 break;
2192 case SNDRV_PCM_TRIGGER_RESUME:
2193 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
2194 goto next;
2195
2196 be->dpcm[stream].be_start++;
2197 if (be->dpcm[stream].be_start != 1)
2198 goto next;
2199
2200 ret = soc_pcm_trigger(be_substream, cmd);
2201 if (ret) {
2202 be->dpcm[stream].be_start--;
2203 goto next;
2204 }
2205
2206 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2207 break;
2208 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2209 if (!be->dpcm[stream].be_start &&
2210 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2211 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2212 goto next;
2213
2214 fe->dpcm[stream].fe_pause = false;
2215 be->dpcm[stream].be_pause--;
2216
2217 be->dpcm[stream].be_start++;
2218 if (be->dpcm[stream].be_start != 1)
2219 goto next;
2220
2221 ret = soc_pcm_trigger(be_substream, cmd);
2222 if (ret) {
2223 be->dpcm[stream].be_start--;
2224 goto next;
2225 }
2226
2227 be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2228 break;
2229 case SNDRV_PCM_TRIGGER_STOP:
2230 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
2231 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2232 goto next;
2233
2234 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2235 be->dpcm[stream].be_start--;
2236
2237 if (be->dpcm[stream].be_start != 0)
2238 goto next;
2239
2240 pause_stop_transition = false;
2241 if (fe->dpcm[stream].fe_pause) {
2242 pause_stop_transition = true;
2243 fe->dpcm[stream].fe_pause = false;
2244 be->dpcm[stream].be_pause--;
2245 }
2246
2247 if (be->dpcm[stream].be_pause != 0)
2248 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
2249 else
2250 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
2251
2252 if (ret) {
2253 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
2254 be->dpcm[stream].be_start++;
2255 if (pause_stop_transition) {
2256 fe->dpcm[stream].fe_pause = true;
2257 be->dpcm[stream].be_pause++;
2258 }
2259 goto next;
2260 }
2261
2262 if (be->dpcm[stream].be_pause != 0)
2263 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2264 else
2265 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2266
2267 break;
2268 case SNDRV_PCM_TRIGGER_SUSPEND:
2269 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2270 goto next;
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_SUSPEND;
2283 break;
2284 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2285 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2286 goto next;
2287
2288 fe->dpcm[stream].fe_pause = true;
2289 be->dpcm[stream].be_pause++;
2290
2291 be->dpcm[stream].be_start--;
2292 if (be->dpcm[stream].be_start != 0)
2293 goto next;
2294
2295 ret = soc_pcm_trigger(be_substream, cmd);
2296 if (ret) {
2297 be->dpcm[stream].be_start++;
2298 goto next;
2299 }
2300
2301 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2302 break;
2303 }
2304 next:
2305 snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
2306 if (ret)
2307 break;
2308 }
2309 return soc_pcm_ret(fe, ret);
2310 }
2311 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
2312
2313 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
2314 int cmd, bool fe_first)
2315 {
2316 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2317 int ret;
2318
2319 /* call trigger on the frontend before the backend. */
2320 if (fe_first) {
2321 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
2322 fe->dai_link->name, cmd);
2323
2324 ret = soc_pcm_trigger(substream, cmd);
2325 if (ret < 0)
2326 return ret;
2327
2328 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2329 return ret;
2330 }
2331
2332 /* call trigger on the frontend after the backend. */
2333 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
2334 if (ret < 0)
2335 return ret;
2336
2337 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
2338 fe->dai_link->name, cmd);
2339
2340 ret = soc_pcm_trigger(substream, cmd);
2341
2342 return ret;
2343 }
2344
2345 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
2346 {
2347 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2348 int stream = substream->stream;
2349 int ret = 0;
2350 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2351
2352 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
2353
2354 switch (trigger) {
2355 case SND_SOC_DPCM_TRIGGER_PRE:
2356 switch (cmd) {
2357 case SNDRV_PCM_TRIGGER_START:
2358 case SNDRV_PCM_TRIGGER_RESUME:
2359 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2360 case SNDRV_PCM_TRIGGER_DRAIN:
2361 ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2362 break;
2363 case SNDRV_PCM_TRIGGER_STOP:
2364 case SNDRV_PCM_TRIGGER_SUSPEND:
2365 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2366 ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2367 break;
2368 default:
2369 ret = -EINVAL;
2370 break;
2371 }
2372 break;
2373 case SND_SOC_DPCM_TRIGGER_POST:
2374 switch (cmd) {
2375 case SNDRV_PCM_TRIGGER_START:
2376 case SNDRV_PCM_TRIGGER_RESUME:
2377 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2378 case SNDRV_PCM_TRIGGER_DRAIN:
2379 ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
2380 break;
2381 case SNDRV_PCM_TRIGGER_STOP:
2382 case SNDRV_PCM_TRIGGER_SUSPEND:
2383 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2384 ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
2385 break;
2386 default:
2387 ret = -EINVAL;
2388 break;
2389 }
2390 break;
2391 case SND_SOC_DPCM_TRIGGER_BESPOKE:
2392 /* bespoke trigger() - handles both FE and BEs */
2393
2394 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
2395 fe->dai_link->name, cmd);
2396
2397 ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
2398 break;
2399 default:
2400 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
2401 fe->dai_link->name);
2402 ret = -EINVAL;
2403 goto out;
2404 }
2405
2406 if (ret < 0) {
2407 dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
2408 cmd, ret);
2409 goto out;
2410 }
2411
2412 switch (cmd) {
2413 case SNDRV_PCM_TRIGGER_START:
2414 case SNDRV_PCM_TRIGGER_RESUME:
2415 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2416 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2417 break;
2418 case SNDRV_PCM_TRIGGER_STOP:
2419 case SNDRV_PCM_TRIGGER_SUSPEND:
2420 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2421 break;
2422 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2423 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
2424 break;
2425 }
2426
2427 out:
2428 fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2429 return ret;
2430 }
2431
2432 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2433 {
2434 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2435 int stream = substream->stream;
2436
2437 /* if FE's runtime_update is already set, we're in race;
2438 * process this trigger later at exit
2439 */
2440 if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2441 fe->dpcm[stream].trigger_pending = cmd + 1;
2442 return 0; /* delayed, assuming it's successful */
2443 }
2444
2445 /* we're alone, let's trigger */
2446 return dpcm_fe_dai_do_trigger(substream, cmd);
2447 }
2448
2449 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2450 {
2451 struct snd_soc_dpcm *dpcm;
2452 int ret = 0;
2453
2454 for_each_dpcm_be(fe, stream, dpcm) {
2455
2456 struct snd_soc_pcm_runtime *be = dpcm->be;
2457 struct snd_pcm_substream *be_substream =
2458 snd_soc_dpcm_get_substream(be, stream);
2459
2460 /* is this op for this BE ? */
2461 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2462 continue;
2463
2464 if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
2465 continue;
2466
2467 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2468 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
2469 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
2470 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
2471 continue;
2472
2473 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2474 be->dai_link->name);
2475
2476 ret = __soc_pcm_prepare(be, be_substream);
2477 if (ret < 0)
2478 break;
2479
2480 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2481 }
2482
2483 return soc_pcm_ret(fe, ret);
2484 }
2485
2486 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2487 {
2488 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(substream);
2489 int stream = substream->stream, ret = 0;
2490
2491 snd_soc_dpcm_mutex_lock(fe);
2492
2493 dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2494
2495 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2496
2497 /* there is no point preparing this FE if there are no BEs */
2498 if (list_empty(&fe->dpcm[stream].be_clients)) {
2499 /* dev_err_once() for visibility, dev_dbg() for debugging UCM profiles */
2500 dev_err_once(fe->dev, "ASoC: no backend DAIs enabled for %s, possibly missing ALSA mixer-based routing or UCM profile\n",
2501 fe->dai_link->name);
2502 dev_dbg(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2503 fe->dai_link->name);
2504 ret = -EINVAL;
2505 goto out;
2506 }
2507
2508 ret = dpcm_be_dai_prepare(fe, stream);
2509 if (ret < 0)
2510 goto out;
2511
2512 /* call prepare on the frontend */
2513 ret = __soc_pcm_prepare(fe, substream);
2514 if (ret < 0)
2515 goto out;
2516
2517 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2518
2519 out:
2520 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2521 snd_soc_dpcm_mutex_unlock(fe);
2522
2523 return soc_pcm_ret(fe, ret);
2524 }
2525
2526 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2527 {
2528 struct snd_pcm_substream *substream =
2529 snd_soc_dpcm_get_substream(fe, stream);
2530 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2531 int err;
2532
2533 dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2534 stream ? "capture" : "playback", fe->dai_link->name);
2535
2536 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2537 /* call bespoke trigger - FE takes care of all BE triggers */
2538 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2539 fe->dai_link->name);
2540
2541 err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2542 } else {
2543 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2544 fe->dai_link->name);
2545
2546 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2547 }
2548
2549 dpcm_be_dai_hw_free(fe, stream);
2550
2551 dpcm_be_dai_shutdown(fe, stream);
2552
2553 /* run the stream event for each BE */
2554 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2555
2556 return soc_pcm_ret(fe, err);
2557 }
2558
2559 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2560 {
2561 struct snd_pcm_substream *substream =
2562 snd_soc_dpcm_get_substream(fe, stream);
2563 struct snd_soc_dpcm *dpcm;
2564 enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2565 int ret = 0;
2566
2567 dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2568 stream ? "capture" : "playback", fe->dai_link->name);
2569
2570 /* Only start the BE if the FE is ready */
2571 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2572 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
2573 dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
2574 fe->dai_link->name, fe->dpcm[stream].state);
2575 ret = -EINVAL;
2576 goto disconnect;
2577 }
2578
2579 /* startup must always be called for new BEs */
2580 ret = dpcm_be_dai_startup(fe, stream);
2581 if (ret < 0)
2582 goto disconnect;
2583
2584 /* keep going if FE state is > open */
2585 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2586 return 0;
2587
2588 ret = dpcm_be_dai_hw_params(fe, stream);
2589 if (ret < 0)
2590 goto close;
2591
2592 /* keep going if FE state is > hw_params */
2593 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2594 return 0;
2595
2596 ret = dpcm_be_dai_prepare(fe, stream);
2597 if (ret < 0)
2598 goto hw_free;
2599
2600 /* run the stream event for each BE */
2601 dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2602
2603 /* keep going if FE state is > prepare */
2604 if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2605 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2606 return 0;
2607
2608 if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2609 /* call trigger on the frontend - FE takes care of all BE triggers */
2610 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2611 fe->dai_link->name);
2612
2613 ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2614 if (ret < 0)
2615 goto hw_free;
2616 } else {
2617 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2618 fe->dai_link->name);
2619
2620 ret = dpcm_be_dai_trigger(fe, stream,
2621 SNDRV_PCM_TRIGGER_START);
2622 if (ret < 0)
2623 goto hw_free;
2624 }
2625
2626 return 0;
2627
2628 hw_free:
2629 dpcm_be_dai_hw_free(fe, stream);
2630 close:
2631 dpcm_be_dai_shutdown(fe, stream);
2632 disconnect:
2633 /* disconnect any pending BEs */
2634 for_each_dpcm_be(fe, stream, dpcm) {
2635 struct snd_soc_pcm_runtime *be = dpcm->be;
2636
2637 /* is this op for this BE ? */
2638 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2639 continue;
2640
2641 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
2642 be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
2643 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2644 }
2645
2646 return soc_pcm_ret(fe, ret);
2647 }
2648
2649 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
2650 {
2651 struct snd_soc_dapm_widget_list *list;
2652 int stream;
2653 int count, paths;
2654
2655 if (!fe->dai_link->dynamic)
2656 return 0;
2657
2658 if (fe->dai_link->num_cpus > 1) {
2659 dev_err(fe->dev,
2660 "%s doesn't support Multi CPU yet\n", __func__);
2661 return -EINVAL;
2662 }
2663
2664 /* only check active links */
2665 if (!snd_soc_dai_active(snd_soc_rtd_to_cpu(fe, 0)))
2666 return 0;
2667
2668 /* DAPM sync will call this to update DSP paths */
2669 dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
2670 new ? "new" : "old", fe->dai_link->name);
2671
2672 for_each_pcm_streams(stream) {
2673
2674 /* skip if FE doesn't have playback/capture capability */
2675 if (!snd_soc_dai_stream_valid(snd_soc_rtd_to_cpu(fe, 0), stream) ||
2676 !snd_soc_dai_stream_valid(snd_soc_rtd_to_codec(fe, 0), stream))
2677 continue;
2678
2679 /* skip if FE isn't currently playing/capturing */
2680 if (!snd_soc_dai_stream_active(snd_soc_rtd_to_cpu(fe, 0), stream) ||
2681 !snd_soc_dai_stream_active(snd_soc_rtd_to_codec(fe, 0), stream))
2682 continue;
2683
2684 paths = dpcm_path_get(fe, stream, &list);
2685 if (paths < 0)
2686 return paths;
2687
2688 /* update any playback/capture paths */
2689 count = dpcm_process_paths(fe, stream, &list, new);
2690 if (count) {
2691 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2692 if (new)
2693 dpcm_run_update_startup(fe, stream);
2694 else
2695 dpcm_run_update_shutdown(fe, stream);
2696 dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2697
2698 dpcm_clear_pending_state(fe, stream);
2699 dpcm_be_disconnect(fe, stream);
2700 }
2701
2702 dpcm_path_put(&list);
2703 }
2704
2705 return 0;
2706 }
2707
2708 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2709 * any DAI links.
2710 */
2711 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
2712 {
2713 struct snd_soc_pcm_runtime *fe;
2714 int ret = 0;
2715
2716 snd_soc_dpcm_mutex_lock(card);
2717 /* shutdown all old paths first */
2718 for_each_card_rtds(card, fe) {
2719 ret = soc_dpcm_fe_runtime_update(fe, 0);
2720 if (ret)
2721 goto out;
2722 }
2723
2724 /* bring new paths up */
2725 for_each_card_rtds(card, fe) {
2726 ret = soc_dpcm_fe_runtime_update(fe, 1);
2727 if (ret)
2728 goto out;
2729 }
2730
2731 out:
2732 snd_soc_dpcm_mutex_unlock(card);
2733 return ret;
2734 }
2735 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
2736
2737 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
2738 {
2739 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2740 struct snd_soc_dpcm *dpcm;
2741 int stream = fe_substream->stream;
2742
2743 snd_soc_dpcm_mutex_assert_held(fe);
2744
2745 /* mark FE's links ready to prune */
2746 for_each_dpcm_be(fe, stream, dpcm)
2747 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2748
2749 dpcm_be_disconnect(fe, stream);
2750 }
2751
2752 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2753 {
2754 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2755 int ret;
2756
2757 snd_soc_dpcm_mutex_lock(fe);
2758 ret = dpcm_fe_dai_shutdown(fe_substream);
2759
2760 dpcm_fe_dai_cleanup(fe_substream);
2761
2762 snd_soc_dpcm_mutex_unlock(fe);
2763 return ret;
2764 }
2765
2766 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2767 {
2768 struct snd_soc_pcm_runtime *fe = snd_soc_substream_to_rtd(fe_substream);
2769 struct snd_soc_dapm_widget_list *list;
2770 int ret;
2771 int stream = fe_substream->stream;
2772
2773 snd_soc_dpcm_mutex_lock(fe);
2774
2775 ret = dpcm_path_get(fe, stream, &list);
2776 if (ret < 0)
2777 goto open_end;
2778
2779 /* calculate valid and active FE <-> BE dpcms */
2780 dpcm_process_paths(fe, stream, &list, 1);
2781
2782 ret = dpcm_fe_dai_startup(fe_substream);
2783 if (ret < 0)
2784 dpcm_fe_dai_cleanup(fe_substream);
2785
2786 dpcm_clear_pending_state(fe, stream);
2787 dpcm_path_put(&list);
2788 open_end:
2789 snd_soc_dpcm_mutex_unlock(fe);
2790 return ret;
2791 }
2792
2793 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
2794 int *playback, int *capture)
2795 {
2796 struct snd_soc_dai_link *dai_link = rtd->dai_link;
2797 struct snd_soc_dai *cpu_dai;
2798 int has_playback = 0;
2799 int has_capture = 0;
2800 int i;
2801
2802 if (dai_link->dynamic && dai_link->num_cpus > 1) {
2803 dev_err(rtd->dev, "DPCM doesn't support Multi CPU for Front-Ends yet\n");
2804 return -EINVAL;
2805 }
2806
2807 if (dai_link->dynamic || dai_link->no_pcm) {
2808 int stream;
2809
2810 if (dai_link->dpcm_playback) {
2811 stream = SNDRV_PCM_STREAM_PLAYBACK;
2812
2813 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2814 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2815 has_playback = 1;
2816 break;
2817 }
2818 }
2819 if (!has_playback) {
2820 dev_err(rtd->card->dev,
2821 "No CPU DAIs support playback for stream %s\n",
2822 dai_link->stream_name);
2823 return -EINVAL;
2824 }
2825 }
2826 if (dai_link->dpcm_capture) {
2827 stream = SNDRV_PCM_STREAM_CAPTURE;
2828
2829 for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
2830 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
2831 has_capture = 1;
2832 break;
2833 }
2834 }
2835
2836 if (!has_capture) {
2837 dev_err(rtd->card->dev,
2838 "No CPU DAIs support capture for stream %s\n",
2839 dai_link->stream_name);
2840 return -EINVAL;
2841 }
2842 }
2843 } else {
2844 struct snd_soc_dai_link_ch_map *ch_maps;
2845 struct snd_soc_dai *codec_dai;
2846
2847 /* Adapt stream for codec2codec links */
2848 int cpu_capture = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE);
2849 int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK);
2850
2851 /*
2852 * see
2853 * soc.h :: [dai_link->ch_maps Image sample]
2854 */
2855 for_each_rtd_ch_maps(rtd, i, ch_maps) {
2856 cpu_dai = snd_soc_rtd_to_cpu(rtd, ch_maps->cpu);
2857 codec_dai = snd_soc_rtd_to_codec(rtd, ch_maps->codec);
2858
2859 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
2860 snd_soc_dai_stream_valid(cpu_dai, cpu_playback))
2861 has_playback = 1;
2862 if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
2863 snd_soc_dai_stream_valid(cpu_dai, cpu_capture))
2864 has_capture = 1;
2865 }
2866 }
2867
2868 if (dai_link->playback_only)
2869 has_capture = 0;
2870
2871 if (dai_link->capture_only)
2872 has_playback = 0;
2873
2874 if (!has_playback && !has_capture) {
2875 dev_err(rtd->dev, "substream %s has no playback, no capture\n",
2876 dai_link->stream_name);
2877
2878 return -EINVAL;
2879 }
2880
2881 *playback = has_playback;
2882 *capture = has_capture;
2883
2884 return 0;
2885 }
2886
2887 static int soc_create_pcm(struct snd_pcm **pcm,
2888 struct snd_soc_pcm_runtime *rtd,
2889 int playback, int capture, int num)
2890 {
2891 char new_name[64];
2892 int ret;
2893
2894 /* create the PCM */
2895 if (rtd->dai_link->c2c_params) {
2896 snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
2897 rtd->dai_link->stream_name);
2898
2899 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2900 playback, capture, pcm);
2901 } else if (rtd->dai_link->no_pcm) {
2902 snprintf(new_name, sizeof(new_name), "(%s)",
2903 rtd->dai_link->stream_name);
2904
2905 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2906 playback, capture, pcm);
2907 } else {
2908 if (rtd->dai_link->dynamic)
2909 snprintf(new_name, sizeof(new_name), "%s (*)",
2910 rtd->dai_link->stream_name);
2911 else
2912 snprintf(new_name, sizeof(new_name), "%s %s-%d",
2913 rtd->dai_link->stream_name,
2914 soc_codec_dai_name(rtd), num);
2915
2916 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2917 capture, pcm);
2918 }
2919 if (ret < 0) {
2920 dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
2921 new_name, rtd->dai_link->name, ret);
2922 return ret;
2923 }
2924 dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2925
2926 return 0;
2927 }
2928
2929 /* create a new pcm */
2930 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2931 {
2932 struct snd_soc_component *component;
2933 struct snd_pcm *pcm;
2934 int ret = 0, playback = 0, capture = 0;
2935 int i;
2936
2937 ret = soc_get_playback_capture(rtd, &playback, &capture);
2938 if (ret < 0)
2939 return ret;
2940
2941 ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
2942 if (ret < 0)
2943 return ret;
2944
2945 /* DAPM dai link stream work */
2946 /*
2947 * Currently nothing to do for c2c links
2948 * Since c2c links are internal nodes in the DAPM graph and
2949 * don't interface with the outside world or application layer
2950 * we don't have to do any special handling on close.
2951 */
2952 if (!rtd->dai_link->c2c_params)
2953 rtd->close_delayed_work_func = snd_soc_close_delayed_work;
2954
2955 rtd->pcm = pcm;
2956 pcm->nonatomic = rtd->dai_link->nonatomic;
2957 pcm->private_data = rtd;
2958 pcm->no_device_suspend = true;
2959
2960 if (rtd->dai_link->no_pcm || rtd->dai_link->c2c_params) {
2961 if (playback)
2962 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2963 if (capture)
2964 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2965 goto out;
2966 }
2967
2968 /* ASoC PCM operations */
2969 if (rtd->dai_link->dynamic) {
2970 rtd->ops.open = dpcm_fe_dai_open;
2971 rtd->ops.hw_params = dpcm_fe_dai_hw_params;
2972 rtd->ops.prepare = dpcm_fe_dai_prepare;
2973 rtd->ops.trigger = dpcm_fe_dai_trigger;
2974 rtd->ops.hw_free = dpcm_fe_dai_hw_free;
2975 rtd->ops.close = dpcm_fe_dai_close;
2976 rtd->ops.pointer = soc_pcm_pointer;
2977 } else {
2978 rtd->ops.open = soc_pcm_open;
2979 rtd->ops.hw_params = soc_pcm_hw_params;
2980 rtd->ops.prepare = soc_pcm_prepare;
2981 rtd->ops.trigger = soc_pcm_trigger;
2982 rtd->ops.hw_free = soc_pcm_hw_free;
2983 rtd->ops.close = soc_pcm_close;
2984 rtd->ops.pointer = soc_pcm_pointer;
2985 }
2986
2987 for_each_rtd_components(rtd, i, component) {
2988 const struct snd_soc_component_driver *drv = component->driver;
2989
2990 if (drv->ioctl)
2991 rtd->ops.ioctl = snd_soc_pcm_component_ioctl;
2992 if (drv->sync_stop)
2993 rtd->ops.sync_stop = snd_soc_pcm_component_sync_stop;
2994 if (drv->copy)
2995 rtd->ops.copy = snd_soc_pcm_component_copy;
2996 if (drv->page)
2997 rtd->ops.page = snd_soc_pcm_component_page;
2998 if (drv->mmap)
2999 rtd->ops.mmap = snd_soc_pcm_component_mmap;
3000 if (drv->ack)
3001 rtd->ops.ack = snd_soc_pcm_component_ack;
3002 }
3003
3004 if (playback)
3005 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
3006
3007 if (capture)
3008 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
3009
3010 ret = snd_soc_pcm_component_new(rtd);
3011 if (ret < 0)
3012 return ret;
3013 out:
3014 dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
3015 soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
3016 return ret;
3017 }
3018
3019 /* is the current PCM operation for this FE ? */
3020 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
3021 {
3022 if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
3023 return 1;
3024 return 0;
3025 }
3026 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
3027
3028 /* is the current PCM operation for this BE ? */
3029 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
3030 struct snd_soc_pcm_runtime *be, int stream)
3031 {
3032 if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
3033 ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
3034 be->dpcm[stream].runtime_update))
3035 return 1;
3036 return 0;
3037 }
3038 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
3039
3040 /* get the substream for this BE */
3041 struct snd_pcm_substream *
3042 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
3043 {
3044 return be->pcm->streams[stream].substream;
3045 }
3046 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
3047
3048 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
3049 struct snd_soc_pcm_runtime *be,
3050 int stream,
3051 const enum snd_soc_dpcm_state *states,
3052 int num_states)
3053 {
3054 struct snd_soc_dpcm *dpcm;
3055 int state;
3056 int ret = 1;
3057 int i;
3058
3059 for_each_dpcm_fe(be, stream, dpcm) {
3060
3061 if (dpcm->fe == fe)
3062 continue;
3063
3064 state = dpcm->fe->dpcm[stream].state;
3065 for (i = 0; i < num_states; i++) {
3066 if (state == states[i]) {
3067 ret = 0;
3068 break;
3069 }
3070 }
3071 }
3072
3073 /* it's safe to do this BE DAI */
3074 return ret;
3075 }
3076
3077 /*
3078 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
3079 * are not running, paused or suspended for the specified stream direction.
3080 */
3081 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
3082 struct snd_soc_pcm_runtime *be, int stream)
3083 {
3084 const enum snd_soc_dpcm_state state[] = {
3085 SND_SOC_DPCM_STATE_START,
3086 SND_SOC_DPCM_STATE_PAUSED,
3087 SND_SOC_DPCM_STATE_SUSPEND,
3088 };
3089
3090 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3091 }
3092 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
3093
3094 /*
3095 * We can only change hw params a BE DAI if any of it's FE are not prepared,
3096 * running, paused or suspended for the specified stream direction.
3097 */
3098 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
3099 struct snd_soc_pcm_runtime *be, int stream)
3100 {
3101 const enum snd_soc_dpcm_state state[] = {
3102 SND_SOC_DPCM_STATE_START,
3103 SND_SOC_DPCM_STATE_PAUSED,
3104 SND_SOC_DPCM_STATE_SUSPEND,
3105 SND_SOC_DPCM_STATE_PREPARE,
3106 };
3107
3108 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3109 }
3110 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
3111
3112 /*
3113 * We can only prepare a BE DAI if any of it's FE are not prepared,
3114 * running or paused for the specified stream direction.
3115 */
3116 int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
3117 struct snd_soc_pcm_runtime *be, int stream)
3118 {
3119 const enum snd_soc_dpcm_state state[] = {
3120 SND_SOC_DPCM_STATE_START,
3121 SND_SOC_DPCM_STATE_PAUSED,
3122 SND_SOC_DPCM_STATE_PREPARE,
3123 };
3124
3125 return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
3126 }
3127 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);
3128
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