xref: /openbmc/linux/sound/soc/soc-compress.c (revision ada066b2) 
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // soc-compress.c  --  ALSA SoC Compress
4 //
5 // Copyright (C) 2012 Intel Corp.
6 //
7 // Authors: Namarta Kohli <namartax.kohli@intel.com>
8 //          Ramesh Babu K V <ramesh.babu@linux.intel.com>
9 //          Vinod Koul <vinod.koul@linux.intel.com>
10 
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/workqueue.h>
16 #include <sound/core.h>
17 #include <sound/compress_params.h>
18 #include <sound/compress_driver.h>
19 #include <sound/soc.h>
20 #include <sound/initval.h>
21 #include <sound/soc-dpcm.h>
22 #include <sound/soc-link.h>
23 #include <linux/pm_runtime.h>
24 
25 static int snd_soc_compr_components_open(struct snd_compr_stream *cstream)
26 {
27 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
28 	struct snd_soc_component *component;
29 	int ret = 0;
30 	int i;
31 
32 	for_each_rtd_components(rtd, i, component) {
33 		ret = snd_soc_component_module_get_when_open(component, cstream);
34 		if (ret < 0)
35 			break;
36 
37 		ret = snd_soc_component_compr_open(component, cstream);
38 		if (ret < 0)
39 			break;
40 	}
41 
42 	return ret;
43 }
44 
45 static void snd_soc_compr_components_free(struct snd_compr_stream *cstream,
46 					  int rollback)
47 {
48 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
49 	struct snd_soc_component *component;
50 	int i;
51 
52 	for_each_rtd_components(rtd, i, component) {
53 		snd_soc_component_compr_free(component, cstream, rollback);
54 		snd_soc_component_module_put_when_close(component, cstream, rollback);
55 	}
56 }
57 
58 static int soc_compr_clean(struct snd_compr_stream *cstream, int rollback)
59 {
60 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
61 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
62 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
63 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
64 
65 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
66 
67 	if (!rollback)
68 		snd_soc_runtime_deactivate(rtd, stream);
69 
70 	snd_soc_dai_digital_mute(codec_dai, 1, stream);
71 
72 	if (!snd_soc_dai_active(cpu_dai))
73 		cpu_dai->rate = 0;
74 
75 	if (!snd_soc_dai_active(codec_dai))
76 		codec_dai->rate = 0;
77 
78 	snd_soc_link_compr_shutdown(cstream, rollback);
79 
80 	snd_soc_compr_components_free(cstream, rollback);
81 
82 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, rollback);
83 
84 	if (!rollback)
85 		snd_soc_dapm_stream_stop(rtd, stream);
86 
87 	mutex_unlock(&rtd->card->pcm_mutex);
88 
89 	snd_soc_pcm_component_pm_runtime_put(rtd, cstream, rollback);
90 
91 	return 0;
92 }
93 
94 static int soc_compr_free(struct snd_compr_stream *cstream)
95 {
96 	return soc_compr_clean(cstream, 0);
97 }
98 
99 static int soc_compr_open(struct snd_compr_stream *cstream)
100 {
101 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
102 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
103 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
104 	int ret;
105 
106 	ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
107 	if (ret < 0)
108 		goto err_no_lock;
109 
110 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
111 
112 	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
113 	if (ret < 0)
114 		goto err;
115 
116 	ret = snd_soc_compr_components_open(cstream);
117 	if (ret < 0)
118 		goto err;
119 
120 	ret = snd_soc_link_compr_startup(cstream);
121 	if (ret < 0)
122 		goto err;
123 
124 	snd_soc_runtime_activate(rtd, stream);
125 err:
126 	mutex_unlock(&rtd->card->pcm_mutex);
127 err_no_lock:
128 	if (ret < 0)
129 		soc_compr_clean(cstream, 1);
130 
131 	return ret;
132 }
133 
134 static int soc_compr_open_fe(struct snd_compr_stream *cstream)
135 {
136 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
137 	struct snd_pcm_substream *fe_substream =
138 		 fe->pcm->streams[cstream->direction].substream;
139 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
140 	struct snd_soc_dpcm *dpcm;
141 	struct snd_soc_dapm_widget_list *list;
142 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
143 	int ret;
144 
145 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
146 	fe->dpcm[stream].runtime = fe_substream->runtime;
147 
148 	ret = dpcm_path_get(fe, stream, &list);
149 	if (ret < 0)
150 		goto be_err;
151 
152 	/* calculate valid and active FE <-> BE dpcms */
153 	dpcm_process_paths(fe, stream, &list, 1);
154 	fe->dpcm[stream].runtime = fe_substream->runtime;
155 
156 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
157 
158 	ret = dpcm_be_dai_startup(fe, stream);
159 	if (ret < 0) {
160 		/* clean up all links */
161 		for_each_dpcm_be(fe, stream, dpcm)
162 			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
163 
164 		dpcm_be_disconnect(fe, stream);
165 		fe->dpcm[stream].runtime = NULL;
166 		goto out;
167 	}
168 
169 	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
170 	if (ret < 0)
171 		goto out;
172 
173 	ret = snd_soc_compr_components_open(cstream);
174 	if (ret < 0)
175 		goto open_err;
176 
177 	ret = snd_soc_link_compr_startup(cstream);
178 	if (ret < 0)
179 		goto machine_err;
180 
181 	dpcm_clear_pending_state(fe, stream);
182 	dpcm_path_put(&list);
183 
184 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
185 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
186 
187 	mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
188 	snd_soc_runtime_activate(fe, stream);
189 	mutex_unlock(&fe->card->pcm_mutex);
190 
191 	mutex_unlock(&fe->card->mutex);
192 
193 	return 0;
194 
195 machine_err:
196 	snd_soc_compr_components_free(cstream, 1);
197 open_err:
198 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, 1);
199 out:
200 	dpcm_path_put(&list);
201 be_err:
202 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
203 	mutex_unlock(&fe->card->mutex);
204 	return ret;
205 }
206 
207 static int soc_compr_free_fe(struct snd_compr_stream *cstream)
208 {
209 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
210 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
211 	struct snd_soc_dpcm *dpcm;
212 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
213 
214 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
215 
216 	mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
217 	snd_soc_runtime_deactivate(fe, stream);
218 	mutex_unlock(&fe->card->pcm_mutex);
219 
220 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
221 
222 	dpcm_be_dai_hw_free(fe, stream);
223 
224 	dpcm_be_dai_shutdown(fe, stream);
225 
226 	/* mark FE's links ready to prune */
227 	for_each_dpcm_be(fe, stream, dpcm)
228 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
229 
230 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
231 
232 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
233 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
234 
235 	dpcm_be_disconnect(fe, stream);
236 
237 	fe->dpcm[stream].runtime = NULL;
238 
239 	snd_soc_link_compr_shutdown(cstream, 0);
240 
241 	snd_soc_compr_components_free(cstream, 0);
242 
243 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, 0);
244 
245 	mutex_unlock(&fe->card->mutex);
246 	return 0;
247 }
248 
249 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
250 {
251 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
252 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
253 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
254 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
255 	int ret;
256 
257 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
258 
259 	ret = snd_soc_component_compr_trigger(cstream, cmd);
260 	if (ret < 0)
261 		goto out;
262 
263 	ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
264 	if (ret < 0)
265 		goto out;
266 
267 	switch (cmd) {
268 	case SNDRV_PCM_TRIGGER_START:
269 		snd_soc_dai_digital_mute(codec_dai, 0, stream);
270 		break;
271 	case SNDRV_PCM_TRIGGER_STOP:
272 		snd_soc_dai_digital_mute(codec_dai, 1, stream);
273 		break;
274 	}
275 
276 out:
277 	mutex_unlock(&rtd->card->pcm_mutex);
278 	return ret;
279 }
280 
281 static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
282 {
283 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
284 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
285 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
286 	int ret;
287 
288 	if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
289 	    cmd == SND_COMPR_TRIGGER_DRAIN)
290 		return snd_soc_component_compr_trigger(cstream, cmd);
291 
292 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
293 
294 	ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
295 	if (ret < 0)
296 		goto out;
297 
298 	ret = snd_soc_component_compr_trigger(cstream, cmd);
299 	if (ret < 0)
300 		goto out;
301 
302 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
303 
304 	ret = dpcm_be_dai_trigger(fe, stream, cmd);
305 
306 	switch (cmd) {
307 	case SNDRV_PCM_TRIGGER_START:
308 	case SNDRV_PCM_TRIGGER_RESUME:
309 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
310 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
311 		break;
312 	case SNDRV_PCM_TRIGGER_STOP:
313 	case SNDRV_PCM_TRIGGER_SUSPEND:
314 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
315 		break;
316 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
317 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
318 		break;
319 	}
320 
321 out:
322 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
323 	mutex_unlock(&fe->card->mutex);
324 	return ret;
325 }
326 
327 static int soc_compr_set_params(struct snd_compr_stream *cstream,
328 				struct snd_compr_params *params)
329 {
330 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
331 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
332 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
333 	int ret;
334 
335 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
336 
337 	/*
338 	 * First we call set_params for the CPU DAI, then the component
339 	 * driver this should configure the SoC side. If the machine has
340 	 * compressed ops then we call that as well. The expectation is
341 	 * that these callbacks will configure everything for this compress
342 	 * path, like configuring a PCM port for a CODEC.
343 	 */
344 	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
345 	if (ret < 0)
346 		goto err;
347 
348 	ret = snd_soc_component_compr_set_params(cstream, params);
349 	if (ret < 0)
350 		goto err;
351 
352 	ret = snd_soc_link_compr_set_params(cstream);
353 	if (ret < 0)
354 		goto err;
355 
356 	snd_soc_dapm_stream_event(rtd, stream, SND_SOC_DAPM_STREAM_START);
357 
358 	/* cancel any delayed stream shutdown that is pending */
359 	rtd->pop_wait = 0;
360 	mutex_unlock(&rtd->card->pcm_mutex);
361 
362 	cancel_delayed_work_sync(&rtd->delayed_work);
363 
364 	return 0;
365 
366 err:
367 	mutex_unlock(&rtd->card->pcm_mutex);
368 	return ret;
369 }
370 
371 static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
372 				   struct snd_compr_params *params)
373 {
374 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
375 	struct snd_pcm_substream *fe_substream =
376 		 fe->pcm->streams[cstream->direction].substream;
377 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
378 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
379 	int ret;
380 
381 	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
382 
383 	/*
384 	 * Create an empty hw_params for the BE as the machine driver must
385 	 * fix this up to match DSP decoder and ASRC configuration.
386 	 * I.e. machine driver fixup for compressed BE is mandatory.
387 	 */
388 	memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
389 		sizeof(struct snd_pcm_hw_params));
390 
391 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
392 
393 	ret = dpcm_be_dai_hw_params(fe, stream);
394 	if (ret < 0)
395 		goto out;
396 
397 	ret = dpcm_be_dai_prepare(fe, stream);
398 	if (ret < 0)
399 		goto out;
400 
401 	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
402 	if (ret < 0)
403 		goto out;
404 
405 	ret = snd_soc_component_compr_set_params(cstream, params);
406 	if (ret < 0)
407 		goto out;
408 
409 	ret = snd_soc_link_compr_set_params(cstream);
410 	if (ret < 0)
411 		goto out;
412 
413 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
414 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
415 
416 out:
417 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
418 	mutex_unlock(&fe->card->mutex);
419 	return ret;
420 }
421 
422 static int soc_compr_get_params(struct snd_compr_stream *cstream,
423 				struct snd_codec *params)
424 {
425 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
426 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
427 	int ret = 0;
428 
429 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
430 
431 	ret = snd_soc_dai_compr_get_params(cpu_dai, cstream, params);
432 	if (ret < 0)
433 		goto err;
434 
435 	ret = snd_soc_component_compr_get_params(cstream, params);
436 err:
437 	mutex_unlock(&rtd->card->pcm_mutex);
438 	return ret;
439 }
440 
441 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
442 {
443 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
444 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
445 	int ret;
446 
447 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
448 
449 	ret = snd_soc_dai_compr_ack(cpu_dai, cstream, bytes);
450 	if (ret < 0)
451 		goto err;
452 
453 	ret = snd_soc_component_compr_ack(cstream, bytes);
454 err:
455 	mutex_unlock(&rtd->card->pcm_mutex);
456 	return ret;
457 }
458 
459 static int soc_compr_pointer(struct snd_compr_stream *cstream,
460 			     struct snd_compr_tstamp *tstamp)
461 {
462 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
463 	int ret;
464 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
465 
466 	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
467 
468 	ret = snd_soc_dai_compr_pointer(cpu_dai, cstream, tstamp);
469 	if (ret < 0)
470 		goto out;
471 
472 	ret = snd_soc_component_compr_pointer(cstream, tstamp);
473 out:
474 	mutex_unlock(&rtd->card->pcm_mutex);
475 	return ret;
476 }
477 
478 static int soc_compr_set_metadata(struct snd_compr_stream *cstream,
479 				  struct snd_compr_metadata *metadata)
480 {
481 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
482 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
483 	int ret;
484 
485 	ret = snd_soc_dai_compr_set_metadata(cpu_dai, cstream, metadata);
486 	if (ret < 0)
487 		return ret;
488 
489 	return snd_soc_component_compr_set_metadata(cstream, metadata);
490 }
491 
492 static int soc_compr_get_metadata(struct snd_compr_stream *cstream,
493 				  struct snd_compr_metadata *metadata)
494 {
495 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
496 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
497 	int ret;
498 
499 	ret = snd_soc_dai_compr_get_metadata(cpu_dai, cstream, metadata);
500 	if (ret < 0)
501 		return ret;
502 
503 	return snd_soc_component_compr_get_metadata(cstream, metadata);
504 }
505 
506 /* ASoC Compress operations */
507 static struct snd_compr_ops soc_compr_ops = {
508 	.open		= soc_compr_open,
509 	.free		= soc_compr_free,
510 	.set_params	= soc_compr_set_params,
511 	.set_metadata   = soc_compr_set_metadata,
512 	.get_metadata	= soc_compr_get_metadata,
513 	.get_params	= soc_compr_get_params,
514 	.trigger	= soc_compr_trigger,
515 	.pointer	= soc_compr_pointer,
516 	.ack		= soc_compr_ack,
517 	.get_caps	= snd_soc_component_compr_get_caps,
518 	.get_codec_caps = snd_soc_component_compr_get_codec_caps,
519 };
520 
521 /* ASoC Dynamic Compress operations */
522 static struct snd_compr_ops soc_compr_dyn_ops = {
523 	.open		= soc_compr_open_fe,
524 	.free		= soc_compr_free_fe,
525 	.set_params	= soc_compr_set_params_fe,
526 	.get_params	= soc_compr_get_params,
527 	.set_metadata   = soc_compr_set_metadata,
528 	.get_metadata	= soc_compr_get_metadata,
529 	.trigger	= soc_compr_trigger_fe,
530 	.pointer	= soc_compr_pointer,
531 	.ack		= soc_compr_ack,
532 	.get_caps	= snd_soc_component_compr_get_caps,
533 	.get_codec_caps = snd_soc_component_compr_get_codec_caps,
534 };
535 
536 /**
537  * snd_soc_new_compress - create a new compress.
538  *
539  * @rtd: The runtime for which we will create compress
540  * @num: the device index number (zero based - shared with normal PCMs)
541  *
542  * Return: 0 for success, else error.
543  */
544 int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
545 {
546 	struct snd_soc_component *component;
547 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
548 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
549 	struct snd_compr *compr;
550 	struct snd_pcm *be_pcm;
551 	char new_name[64];
552 	int ret = 0, direction = 0;
553 	int playback = 0, capture = 0;
554 	int i;
555 
556 	/*
557 	 * make sure these are same value,
558 	 * and then use these as equally
559 	 */
560 	BUILD_BUG_ON((int)SNDRV_PCM_STREAM_PLAYBACK != (int)SND_COMPRESS_PLAYBACK);
561 	BUILD_BUG_ON((int)SNDRV_PCM_STREAM_CAPTURE  != (int)SND_COMPRESS_CAPTURE);
562 
563 	if (rtd->num_cpus > 1 ||
564 	    rtd->num_codecs > 1) {
565 		dev_err(rtd->card->dev,
566 			"Compress ASoC: Multi CPU/Codec not supported\n");
567 		return -EINVAL;
568 	}
569 
570 	/* check client and interface hw capabilities */
571 	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
572 	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
573 		playback = 1;
574 	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
575 	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
576 		capture = 1;
577 
578 	/*
579 	 * Compress devices are unidirectional so only one of the directions
580 	 * should be set, check for that (xor)
581 	 */
582 	if (playback + capture != 1) {
583 		dev_err(rtd->card->dev,
584 			"Compress ASoC: Invalid direction for P %d, C %d\n",
585 			playback, capture);
586 		return -EINVAL;
587 	}
588 
589 	if (playback)
590 		direction = SND_COMPRESS_PLAYBACK;
591 	else
592 		direction = SND_COMPRESS_CAPTURE;
593 
594 	compr = devm_kzalloc(rtd->card->dev, sizeof(*compr), GFP_KERNEL);
595 	if (!compr)
596 		return -ENOMEM;
597 
598 	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
599 				  GFP_KERNEL);
600 	if (!compr->ops)
601 		return -ENOMEM;
602 
603 	if (rtd->dai_link->dynamic) {
604 		snprintf(new_name, sizeof(new_name), "(%s)",
605 			rtd->dai_link->stream_name);
606 
607 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
608 				rtd->dai_link->dpcm_playback,
609 				rtd->dai_link->dpcm_capture, &be_pcm);
610 		if (ret < 0) {
611 			dev_err(rtd->card->dev,
612 				"Compress ASoC: can't create compressed for %s: %d\n",
613 				rtd->dai_link->name, ret);
614 			return ret;
615 		}
616 
617 		rtd->pcm = be_pcm;
618 		rtd->fe_compr = 1;
619 		if (rtd->dai_link->dpcm_playback)
620 			be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
621 		else if (rtd->dai_link->dpcm_capture)
622 			be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
623 		memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
624 	} else {
625 		snprintf(new_name, sizeof(new_name), "%s %s-%d",
626 			rtd->dai_link->stream_name, codec_dai->name, num);
627 
628 		memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
629 	}
630 
631 	for_each_rtd_components(rtd, i, component) {
632 		if (!component->driver->compress_ops ||
633 		    !component->driver->compress_ops->copy)
634 			continue;
635 
636 		compr->ops->copy = snd_soc_component_compr_copy;
637 		break;
638 	}
639 
640 	ret = snd_compress_new(rtd->card->snd_card, num, direction,
641 				new_name, compr);
642 	if (ret < 0) {
643 		component = asoc_rtd_to_codec(rtd, 0)->component;
644 		dev_err(component->dev,
645 			"Compress ASoC: can't create compress for codec %s: %d\n",
646 			component->name, ret);
647 		return ret;
648 	}
649 
650 	/* DAPM dai link stream work */
651 	rtd->close_delayed_work_func = snd_soc_close_delayed_work;
652 
653 	rtd->compr = compr;
654 	compr->private_data = rtd;
655 
656 	dev_dbg(rtd->card->dev, "Compress ASoC: %s <-> %s mapping ok\n",
657 		codec_dai->name, cpu_dai->name);
658 
659 	return 0;
660 }
661 EXPORT_SYMBOL_GPL(snd_soc_new_compress);
662