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 
snd_soc_compr_components_open(struct snd_compr_stream * cstream)24 static int snd_soc_compr_components_open(struct snd_compr_stream *cstream)
25 {
26 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
27 	struct snd_soc_component *component;
28 	int ret = 0;
29 	int i;
30 
31 	for_each_rtd_components(rtd, i, component) {
32 		ret = snd_soc_component_module_get_when_open(component, cstream);
33 		if (ret < 0)
34 			break;
35 
36 		ret = snd_soc_component_compr_open(component, cstream);
37 		if (ret < 0)
38 			break;
39 	}
40 
41 	return ret;
42 }
43 
snd_soc_compr_components_free(struct snd_compr_stream * cstream,int rollback)44 static void snd_soc_compr_components_free(struct snd_compr_stream *cstream,
45 					  int rollback)
46 {
47 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
48 	struct snd_soc_component *component;
49 	int i;
50 
51 	for_each_rtd_components(rtd, i, component) {
52 		snd_soc_component_compr_free(component, cstream, rollback);
53 		snd_soc_component_module_put_when_close(component, cstream, rollback);
54 	}
55 }
56 
soc_compr_clean(struct snd_compr_stream * cstream,int rollback)57 static int soc_compr_clean(struct snd_compr_stream *cstream, int rollback)
58 {
59 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
60 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
61 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
62 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
63 
64 	snd_soc_dpcm_mutex_lock(rtd);
65 
66 	if (!rollback)
67 		snd_soc_runtime_deactivate(rtd, stream);
68 
69 	snd_soc_dai_digital_mute(codec_dai, 1, stream);
70 
71 	if (!snd_soc_dai_active(cpu_dai))
72 		cpu_dai->rate = 0;
73 
74 	if (!snd_soc_dai_active(codec_dai))
75 		codec_dai->rate = 0;
76 
77 	snd_soc_link_compr_shutdown(cstream, rollback);
78 
79 	snd_soc_compr_components_free(cstream, rollback);
80 
81 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, rollback);
82 
83 	if (!rollback)
84 		snd_soc_dapm_stream_stop(rtd, stream);
85 
86 	snd_soc_dpcm_mutex_unlock(rtd);
87 
88 	snd_soc_pcm_component_pm_runtime_put(rtd, cstream, rollback);
89 
90 	return 0;
91 }
92 
soc_compr_free(struct snd_compr_stream * cstream)93 static int soc_compr_free(struct snd_compr_stream *cstream)
94 {
95 	return soc_compr_clean(cstream, 0);
96 }
97 
soc_compr_open(struct snd_compr_stream * cstream)98 static int soc_compr_open(struct snd_compr_stream *cstream)
99 {
100 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
101 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
102 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
103 	int ret;
104 
105 	ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
106 	if (ret < 0)
107 		goto err_no_lock;
108 
109 	snd_soc_dpcm_mutex_lock(rtd);
110 
111 	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
112 	if (ret < 0)
113 		goto err;
114 
115 	ret = snd_soc_compr_components_open(cstream);
116 	if (ret < 0)
117 		goto err;
118 
119 	ret = snd_soc_link_compr_startup(cstream);
120 	if (ret < 0)
121 		goto err;
122 
123 	snd_soc_runtime_activate(rtd, stream);
124 err:
125 	snd_soc_dpcm_mutex_unlock(rtd);
126 err_no_lock:
127 	if (ret < 0)
128 		soc_compr_clean(cstream, 1);
129 
130 	return ret;
131 }
132 
soc_compr_open_fe(struct snd_compr_stream * cstream)133 static int soc_compr_open_fe(struct snd_compr_stream *cstream)
134 {
135 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
136 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
137 	struct snd_soc_dpcm *dpcm;
138 	struct snd_soc_dapm_widget_list *list;
139 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
140 	int ret;
141 
142 	snd_soc_card_mutex_lock(fe->card);
143 
144 	ret = dpcm_path_get(fe, stream, &list);
145 	if (ret < 0)
146 		goto be_err;
147 
148 	snd_soc_dpcm_mutex_lock(fe);
149 
150 	/* calculate valid and active FE <-> BE dpcms */
151 	dpcm_process_paths(fe, stream, &list, 1);
152 
153 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
154 
155 	ret = dpcm_be_dai_startup(fe, stream);
156 	if (ret < 0) {
157 		/* clean up all links */
158 		for_each_dpcm_be(fe, stream, dpcm)
159 			dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
160 
161 		dpcm_be_disconnect(fe, stream);
162 		goto out;
163 	}
164 
165 	ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
166 	if (ret < 0)
167 		goto out;
168 
169 	ret = snd_soc_compr_components_open(cstream);
170 	if (ret < 0)
171 		goto open_err;
172 
173 	ret = snd_soc_link_compr_startup(cstream);
174 	if (ret < 0)
175 		goto machine_err;
176 
177 	dpcm_clear_pending_state(fe, stream);
178 	dpcm_path_put(&list);
179 
180 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
181 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
182 
183 	snd_soc_runtime_activate(fe, stream);
184 	snd_soc_dpcm_mutex_unlock(fe);
185 
186 	snd_soc_card_mutex_unlock(fe->card);
187 
188 	return 0;
189 
190 machine_err:
191 	snd_soc_compr_components_free(cstream, 1);
192 open_err:
193 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, 1);
194 out:
195 	dpcm_path_put(&list);
196 	snd_soc_dpcm_mutex_unlock(fe);
197 be_err:
198 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
199 	snd_soc_card_mutex_unlock(fe->card);
200 	return ret;
201 }
202 
soc_compr_free_fe(struct snd_compr_stream * cstream)203 static int soc_compr_free_fe(struct snd_compr_stream *cstream)
204 {
205 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
206 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
207 	struct snd_soc_dpcm *dpcm;
208 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
209 
210 	snd_soc_card_mutex_lock(fe->card);
211 
212 	snd_soc_dpcm_mutex_lock(fe);
213 	snd_soc_runtime_deactivate(fe, stream);
214 
215 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
216 
217 	dpcm_be_dai_hw_free(fe, stream);
218 
219 	dpcm_be_dai_shutdown(fe, stream);
220 
221 	/* mark FE's links ready to prune */
222 	for_each_dpcm_be(fe, stream, dpcm)
223 		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
224 
225 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
226 
227 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
228 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
229 
230 	dpcm_be_disconnect(fe, stream);
231 
232 	snd_soc_dpcm_mutex_unlock(fe);
233 
234 	snd_soc_link_compr_shutdown(cstream, 0);
235 
236 	snd_soc_compr_components_free(cstream, 0);
237 
238 	snd_soc_dai_compr_shutdown(cpu_dai, cstream, 0);
239 
240 	snd_soc_card_mutex_unlock(fe->card);
241 	return 0;
242 }
243 
soc_compr_trigger(struct snd_compr_stream * cstream,int cmd)244 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
245 {
246 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
247 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
248 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
249 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
250 	int ret;
251 
252 	snd_soc_dpcm_mutex_lock(rtd);
253 
254 	ret = snd_soc_component_compr_trigger(cstream, cmd);
255 	if (ret < 0)
256 		goto out;
257 
258 	ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
259 	if (ret < 0)
260 		goto out;
261 
262 	switch (cmd) {
263 	case SNDRV_PCM_TRIGGER_START:
264 		snd_soc_dai_digital_mute(codec_dai, 0, stream);
265 		break;
266 	case SNDRV_PCM_TRIGGER_STOP:
267 		snd_soc_dai_digital_mute(codec_dai, 1, stream);
268 		break;
269 	}
270 
271 out:
272 	snd_soc_dpcm_mutex_unlock(rtd);
273 	return ret;
274 }
275 
soc_compr_trigger_fe(struct snd_compr_stream * cstream,int cmd)276 static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
277 {
278 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
279 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
280 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
281 	int ret;
282 
283 	if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
284 	    cmd == SND_COMPR_TRIGGER_DRAIN)
285 		return snd_soc_component_compr_trigger(cstream, cmd);
286 
287 	snd_soc_card_mutex_lock(fe->card);
288 
289 	ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
290 	if (ret < 0)
291 		goto out;
292 
293 	ret = snd_soc_component_compr_trigger(cstream, cmd);
294 	if (ret < 0)
295 		goto out;
296 
297 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
298 
299 	ret = dpcm_be_dai_trigger(fe, stream, cmd);
300 
301 	switch (cmd) {
302 	case SNDRV_PCM_TRIGGER_START:
303 	case SNDRV_PCM_TRIGGER_RESUME:
304 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
305 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
306 		break;
307 	case SNDRV_PCM_TRIGGER_STOP:
308 	case SNDRV_PCM_TRIGGER_SUSPEND:
309 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
310 		break;
311 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
312 		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
313 		break;
314 	}
315 
316 out:
317 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
318 	snd_soc_card_mutex_unlock(fe->card);
319 	return ret;
320 }
321 
soc_compr_set_params(struct snd_compr_stream * cstream,struct snd_compr_params * params)322 static int soc_compr_set_params(struct snd_compr_stream *cstream,
323 				struct snd_compr_params *params)
324 {
325 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
326 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
327 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
328 	int ret;
329 
330 	snd_soc_dpcm_mutex_lock(rtd);
331 
332 	/*
333 	 * First we call set_params for the CPU DAI, then the component
334 	 * driver this should configure the SoC side. If the machine has
335 	 * compressed ops then we call that as well. The expectation is
336 	 * that these callbacks will configure everything for this compress
337 	 * path, like configuring a PCM port for a CODEC.
338 	 */
339 	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
340 	if (ret < 0)
341 		goto err;
342 
343 	ret = snd_soc_component_compr_set_params(cstream, params);
344 	if (ret < 0)
345 		goto err;
346 
347 	ret = snd_soc_link_compr_set_params(cstream);
348 	if (ret < 0)
349 		goto err;
350 
351 	snd_soc_dapm_stream_event(rtd, stream, SND_SOC_DAPM_STREAM_START);
352 
353 	/* cancel any delayed stream shutdown that is pending */
354 	rtd->pop_wait = 0;
355 	snd_soc_dpcm_mutex_unlock(rtd);
356 
357 	cancel_delayed_work_sync(&rtd->delayed_work);
358 
359 	return 0;
360 
361 err:
362 	snd_soc_dpcm_mutex_unlock(rtd);
363 	return ret;
364 }
365 
soc_compr_set_params_fe(struct snd_compr_stream * cstream,struct snd_compr_params * params)366 static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
367 				   struct snd_compr_params *params)
368 {
369 	struct snd_soc_pcm_runtime *fe = cstream->private_data;
370 	struct snd_pcm_substream *fe_substream =
371 		 fe->pcm->streams[cstream->direction].substream;
372 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
373 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
374 	int ret;
375 
376 	snd_soc_card_mutex_lock(fe->card);
377 
378 	/*
379 	 * Create an empty hw_params for the BE as the machine driver must
380 	 * fix this up to match DSP decoder and ASRC configuration.
381 	 * I.e. machine driver fixup for compressed BE is mandatory.
382 	 */
383 	memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
384 		sizeof(struct snd_pcm_hw_params));
385 
386 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
387 
388 	ret = dpcm_be_dai_hw_params(fe, stream);
389 	if (ret < 0)
390 		goto out;
391 
392 	ret = dpcm_be_dai_prepare(fe, stream);
393 	if (ret < 0)
394 		goto out;
395 
396 	ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
397 	if (ret < 0)
398 		goto out;
399 
400 	ret = snd_soc_component_compr_set_params(cstream, params);
401 	if (ret < 0)
402 		goto out;
403 
404 	ret = snd_soc_link_compr_set_params(cstream);
405 	if (ret < 0)
406 		goto out;
407 	snd_soc_dpcm_mutex_lock(fe);
408 	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
409 	snd_soc_dpcm_mutex_unlock(fe);
410 	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
411 
412 out:
413 	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
414 	snd_soc_card_mutex_unlock(fe->card);
415 	return ret;
416 }
417 
soc_compr_get_params(struct snd_compr_stream * cstream,struct snd_codec * params)418 static int soc_compr_get_params(struct snd_compr_stream *cstream,
419 				struct snd_codec *params)
420 {
421 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
422 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
423 	int ret = 0;
424 
425 	snd_soc_dpcm_mutex_lock(rtd);
426 
427 	ret = snd_soc_dai_compr_get_params(cpu_dai, cstream, params);
428 	if (ret < 0)
429 		goto err;
430 
431 	ret = snd_soc_component_compr_get_params(cstream, params);
432 err:
433 	snd_soc_dpcm_mutex_unlock(rtd);
434 	return ret;
435 }
436 
soc_compr_ack(struct snd_compr_stream * cstream,size_t bytes)437 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
438 {
439 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
440 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
441 	int ret;
442 
443 	snd_soc_dpcm_mutex_lock(rtd);
444 
445 	ret = snd_soc_dai_compr_ack(cpu_dai, cstream, bytes);
446 	if (ret < 0)
447 		goto err;
448 
449 	ret = snd_soc_component_compr_ack(cstream, bytes);
450 err:
451 	snd_soc_dpcm_mutex_unlock(rtd);
452 	return ret;
453 }
454 
soc_compr_pointer(struct snd_compr_stream * cstream,struct snd_compr_tstamp * tstamp)455 static int soc_compr_pointer(struct snd_compr_stream *cstream,
456 			     struct snd_compr_tstamp *tstamp)
457 {
458 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
459 	int ret;
460 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
461 
462 	snd_soc_dpcm_mutex_lock(rtd);
463 
464 	ret = snd_soc_dai_compr_pointer(cpu_dai, cstream, tstamp);
465 	if (ret < 0)
466 		goto out;
467 
468 	ret = snd_soc_component_compr_pointer(cstream, tstamp);
469 out:
470 	snd_soc_dpcm_mutex_unlock(rtd);
471 	return ret;
472 }
473 
soc_compr_set_metadata(struct snd_compr_stream * cstream,struct snd_compr_metadata * metadata)474 static int soc_compr_set_metadata(struct snd_compr_stream *cstream,
475 				  struct snd_compr_metadata *metadata)
476 {
477 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
478 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
479 	int ret;
480 
481 	ret = snd_soc_dai_compr_set_metadata(cpu_dai, cstream, metadata);
482 	if (ret < 0)
483 		return ret;
484 
485 	return snd_soc_component_compr_set_metadata(cstream, metadata);
486 }
487 
soc_compr_get_metadata(struct snd_compr_stream * cstream,struct snd_compr_metadata * metadata)488 static int soc_compr_get_metadata(struct snd_compr_stream *cstream,
489 				  struct snd_compr_metadata *metadata)
490 {
491 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
492 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
493 	int ret;
494 
495 	ret = snd_soc_dai_compr_get_metadata(cpu_dai, cstream, metadata);
496 	if (ret < 0)
497 		return ret;
498 
499 	return snd_soc_component_compr_get_metadata(cstream, metadata);
500 }
501 
502 /* ASoC Compress operations */
503 static struct snd_compr_ops soc_compr_ops = {
504 	.open		= soc_compr_open,
505 	.free		= soc_compr_free,
506 	.set_params	= soc_compr_set_params,
507 	.set_metadata   = soc_compr_set_metadata,
508 	.get_metadata	= soc_compr_get_metadata,
509 	.get_params	= soc_compr_get_params,
510 	.trigger	= soc_compr_trigger,
511 	.pointer	= soc_compr_pointer,
512 	.ack		= soc_compr_ack,
513 	.get_caps	= snd_soc_component_compr_get_caps,
514 	.get_codec_caps = snd_soc_component_compr_get_codec_caps,
515 };
516 
517 /* ASoC Dynamic Compress operations */
518 static struct snd_compr_ops soc_compr_dyn_ops = {
519 	.open		= soc_compr_open_fe,
520 	.free		= soc_compr_free_fe,
521 	.set_params	= soc_compr_set_params_fe,
522 	.get_params	= soc_compr_get_params,
523 	.set_metadata   = soc_compr_set_metadata,
524 	.get_metadata	= soc_compr_get_metadata,
525 	.trigger	= soc_compr_trigger_fe,
526 	.pointer	= soc_compr_pointer,
527 	.ack		= soc_compr_ack,
528 	.get_caps	= snd_soc_component_compr_get_caps,
529 	.get_codec_caps = snd_soc_component_compr_get_codec_caps,
530 };
531 
532 /**
533  * snd_soc_new_compress - create a new compress.
534  *
535  * @rtd: The runtime for which we will create compress
536  * @num: the device index number (zero based - shared with normal PCMs)
537  *
538  * Return: 0 for success, else error.
539  */
snd_soc_new_compress(struct snd_soc_pcm_runtime * rtd,int num)540 int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
541 {
542 	struct snd_soc_component *component;
543 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
544 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
545 	struct snd_compr *compr;
546 	struct snd_pcm *be_pcm;
547 	char new_name[64];
548 	int ret = 0, direction = 0;
549 	int playback = 0, capture = 0;
550 	int i;
551 
552 	/*
553 	 * make sure these are same value,
554 	 * and then use these as equally
555 	 */
556 	BUILD_BUG_ON((int)SNDRV_PCM_STREAM_PLAYBACK != (int)SND_COMPRESS_PLAYBACK);
557 	BUILD_BUG_ON((int)SNDRV_PCM_STREAM_CAPTURE  != (int)SND_COMPRESS_CAPTURE);
558 
559 	if (rtd->dai_link->num_cpus > 1 ||
560 	    rtd->dai_link->num_codecs > 1) {
561 		dev_err(rtd->card->dev,
562 			"Compress ASoC: Multi CPU/Codec not supported\n");
563 		return -EINVAL;
564 	}
565 
566 	if (!codec_dai) {
567 		dev_err(rtd->card->dev, "Missing codec\n");
568 		return -EINVAL;
569 	}
570 
571 	/* check client and interface hw capabilities */
572 	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
573 	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
574 		playback = 1;
575 	if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
576 	    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
577 		capture = 1;
578 
579 	/*
580 	 * Compress devices are unidirectional so only one of the directions
581 	 * should be set, check for that (xor)
582 	 */
583 	if (playback + capture != 1) {
584 		dev_err(rtd->card->dev,
585 			"Compress ASoC: Invalid direction for P %d, C %d\n",
586 			playback, capture);
587 		return -EINVAL;
588 	}
589 
590 	if (playback)
591 		direction = SND_COMPRESS_PLAYBACK;
592 	else
593 		direction = SND_COMPRESS_CAPTURE;
594 
595 	compr = devm_kzalloc(rtd->card->dev, sizeof(*compr), GFP_KERNEL);
596 	if (!compr)
597 		return -ENOMEM;
598 
599 	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
600 				  GFP_KERNEL);
601 	if (!compr->ops)
602 		return -ENOMEM;
603 
604 	if (rtd->dai_link->dynamic) {
605 		snprintf(new_name, sizeof(new_name), "(%s)",
606 			rtd->dai_link->stream_name);
607 
608 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
609 				rtd->dai_link->dpcm_playback,
610 				rtd->dai_link->dpcm_capture, &be_pcm);
611 		if (ret < 0) {
612 			dev_err(rtd->card->dev,
613 				"Compress ASoC: can't create compressed for %s: %d\n",
614 				rtd->dai_link->name, ret);
615 			return ret;
616 		}
617 
618 		/* inherit atomicity from DAI link */
619 		be_pcm->nonatomic = rtd->dai_link->nonatomic;
620 
621 		rtd->pcm = be_pcm;
622 		rtd->fe_compr = 1;
623 		if (rtd->dai_link->dpcm_playback)
624 			be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
625 		if (rtd->dai_link->dpcm_capture)
626 			be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
627 		memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
628 	} else {
629 		snprintf(new_name, sizeof(new_name), "%s %s-%d",
630 			rtd->dai_link->stream_name, codec_dai->name, num);
631 
632 		memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
633 	}
634 
635 	for_each_rtd_components(rtd, i, component) {
636 		if (!component->driver->compress_ops ||
637 		    !component->driver->compress_ops->copy)
638 			continue;
639 
640 		compr->ops->copy = snd_soc_component_compr_copy;
641 		break;
642 	}
643 
644 	ret = snd_compress_new(rtd->card->snd_card, num, direction,
645 				new_name, compr);
646 	if (ret < 0) {
647 		component = asoc_rtd_to_codec(rtd, 0)->component;
648 		dev_err(component->dev,
649 			"Compress ASoC: can't create compress for codec %s: %d\n",
650 			component->name, ret);
651 		return ret;
652 	}
653 
654 	/* DAPM dai link stream work */
655 	rtd->close_delayed_work_func = snd_soc_close_delayed_work;
656 
657 	rtd->compr = compr;
658 	compr->private_data = rtd;
659 
660 	dev_dbg(rtd->card->dev, "Compress ASoC: %s <-> %s mapping ok\n",
661 		codec_dai->name, cpu_dai->name);
662 
663 	return 0;
664 }
665 EXPORT_SYMBOL_GPL(snd_soc_new_compress);
666