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1/*
2 * compress_core.c - compress offload core
3 *
4 * Copyright (C) 2011 Intel Corporation
5 * Authors: Vinod Koul <vinod.koul@linux.intel.com>
6 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
26#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
27
28#include <linux/file.h>
29#include <linux/fs.h>
30#include <linux/list.h>
31#include <linux/math64.h>
32#include <linux/mm.h>
33#include <linux/mutex.h>
34#include <linux/poll.h>
35#include <linux/slab.h>
36#include <linux/sched.h>
37#include <linux/types.h>
38#include <linux/uio.h>
39#include <linux/uaccess.h>
40#include <linux/module.h>
41#include <sound/core.h>
42#include <sound/initval.h>
43#include <sound/compress_params.h>
44#include <sound/compress_offload.h>
45#include <sound/compress_driver.h>
46
47/* TODO:
48 * - add substream support for multiple devices in case of
49 * SND_DYNAMIC_MINORS is not used
50 * - Multiple node representation
51 * driver should be able to register multiple nodes
52 */
53
54static DEFINE_MUTEX(device_mutex);
55
56struct snd_compr_file {
57 unsigned long caps;
58 struct snd_compr_stream stream;
59};
60
61/*
62 * a note on stream states used:
63 * we use follwing states in the compressed core
64 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
65 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
66 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
67 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
68 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
69 * decoding/encoding and rendering/capturing data.
70 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
71 * by calling SNDRV_COMPRESS_DRAIN.
72 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
73 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
74 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
75 */
76static int snd_compr_open(struct inode *inode, struct file *f)
77{
78 struct snd_compr *compr;
79 struct snd_compr_file *data;
80 struct snd_compr_runtime *runtime;
81 enum snd_compr_direction dirn;
82 int maj = imajor(inode);
83 int ret;
84
85 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
86 dirn = SND_COMPRESS_PLAYBACK;
87 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
88 dirn = SND_COMPRESS_CAPTURE;
89 else
90 return -EINVAL;
91
92 if (maj == snd_major)
93 compr = snd_lookup_minor_data(iminor(inode),
94 SNDRV_DEVICE_TYPE_COMPRESS);
95 else
96 return -EBADFD;
97
98 if (compr == NULL) {
99 pr_err("no device data!!!\n");
100 return -ENODEV;
101 }
102
103 if (dirn != compr->direction) {
104 pr_err("this device doesn't support this direction\n");
105 snd_card_unref(compr->card);
106 return -EINVAL;
107 }
108
109 data = kzalloc(sizeof(*data), GFP_KERNEL);
110 if (!data) {
111 snd_card_unref(compr->card);
112 return -ENOMEM;
113 }
114 data->stream.ops = compr->ops;
115 data->stream.direction = dirn;
116 data->stream.private_data = compr->private_data;
117 data->stream.device = compr;
118 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119 if (!runtime) {
120 kfree(data);
121 snd_card_unref(compr->card);
122 return -ENOMEM;
123 }
124 runtime->state = SNDRV_PCM_STATE_OPEN;
125 init_waitqueue_head(&runtime->sleep);
126 data->stream.runtime = runtime;
127 f->private_data = (void *)data;
128 mutex_lock(&compr->lock);
129 ret = compr->ops->open(&data->stream);
130 mutex_unlock(&compr->lock);
131 if (ret) {
132 kfree(runtime);
133 kfree(data);
134 }
135 snd_card_unref(compr->card);
136 return ret;
137}
138
139static int snd_compr_free(struct inode *inode, struct file *f)
140{
141 struct snd_compr_file *data = f->private_data;
142 struct snd_compr_runtime *runtime = data->stream.runtime;
143
144 switch (runtime->state) {
145 case SNDRV_PCM_STATE_RUNNING:
146 case SNDRV_PCM_STATE_DRAINING:
147 case SNDRV_PCM_STATE_PAUSED:
148 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
149 break;
150 default:
151 break;
152 }
153
154 data->stream.ops->free(&data->stream);
155 kfree(data->stream.runtime->buffer);
156 kfree(data->stream.runtime);
157 kfree(data);
158 return 0;
159}
160
161static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
162 struct snd_compr_tstamp *tstamp)
163{
164 if (!stream->ops->pointer)
165 return -ENOTSUPP;
166 stream->ops->pointer(stream, tstamp);
167 pr_debug("dsp consumed till %d total %d bytes\n",
168 tstamp->byte_offset, tstamp->copied_total);
169 if (stream->direction == SND_COMPRESS_PLAYBACK)
170 stream->runtime->total_bytes_transferred = tstamp->copied_total;
171 else
172 stream->runtime->total_bytes_available = tstamp->copied_total;
173 return 0;
174}
175
176static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
177 struct snd_compr_avail *avail)
178{
179 memset(avail, 0, sizeof(*avail));
180 snd_compr_update_tstamp(stream, &avail->tstamp);
181 /* Still need to return avail even if tstamp can't be filled in */
182
183 if (stream->runtime->total_bytes_available == 0 &&
184 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
185 stream->direction == SND_COMPRESS_PLAYBACK) {
186 pr_debug("detected init and someone forgot to do a write\n");
187 return stream->runtime->buffer_size;
188 }
189 pr_debug("app wrote %lld, DSP consumed %lld\n",
190 stream->runtime->total_bytes_available,
191 stream->runtime->total_bytes_transferred);
192 if (stream->runtime->total_bytes_available ==
193 stream->runtime->total_bytes_transferred) {
194 if (stream->direction == SND_COMPRESS_PLAYBACK) {
195 pr_debug("both pointers are same, returning full avail\n");
196 return stream->runtime->buffer_size;
197 } else {
198 pr_debug("both pointers are same, returning no avail\n");
199 return 0;
200 }
201 }
202
203 avail->avail = stream->runtime->total_bytes_available -
204 stream->runtime->total_bytes_transferred;
205 if (stream->direction == SND_COMPRESS_PLAYBACK)
206 avail->avail = stream->runtime->buffer_size - avail->avail;
207
208 pr_debug("ret avail as %lld\n", avail->avail);
209 return avail->avail;
210}
211
212static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
213{
214 struct snd_compr_avail avail;
215
216 return snd_compr_calc_avail(stream, &avail);
217}
218
219static int
220snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
221{
222 struct snd_compr_avail ioctl_avail;
223 size_t avail;
224
225 avail = snd_compr_calc_avail(stream, &ioctl_avail);
226 ioctl_avail.avail = avail;
227
228 if (copy_to_user((__u64 __user *)arg,
229 &ioctl_avail, sizeof(ioctl_avail)))
230 return -EFAULT;
231 return 0;
232}
233
234static int snd_compr_write_data(struct snd_compr_stream *stream,
235 const char __user *buf, size_t count)
236{
237 void *dstn;
238 size_t copy;
239 struct snd_compr_runtime *runtime = stream->runtime;
240 /* 64-bit Modulus */
241 u64 app_pointer = div64_u64(runtime->total_bytes_available,
242 runtime->buffer_size);
243 app_pointer = runtime->total_bytes_available -
244 (app_pointer * runtime->buffer_size);
245
246 dstn = runtime->buffer + app_pointer;
247 pr_debug("copying %ld at %lld\n",
248 (unsigned long)count, app_pointer);
249 if (count < runtime->buffer_size - app_pointer) {
250 if (copy_from_user(dstn, buf, count))
251 return -EFAULT;
252 } else {
253 copy = runtime->buffer_size - app_pointer;
254 if (copy_from_user(dstn, buf, copy))
255 return -EFAULT;
256 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
257 return -EFAULT;
258 }
259 /* if DSP cares, let it know data has been written */
260 if (stream->ops->ack)
261 stream->ops->ack(stream, count);
262 return count;
263}
264
265static ssize_t snd_compr_write(struct file *f, const char __user *buf,
266 size_t count, loff_t *offset)
267{
268 struct snd_compr_file *data = f->private_data;
269 struct snd_compr_stream *stream;
270 size_t avail;
271 int retval;
272
273 if (snd_BUG_ON(!data))
274 return -EFAULT;
275
276 stream = &data->stream;
277 mutex_lock(&stream->device->lock);
278 /* write is allowed when stream is running or has been steup */
279 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
280 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
281 mutex_unlock(&stream->device->lock);
282 return -EBADFD;
283 }
284
285 avail = snd_compr_get_avail(stream);
286 pr_debug("avail returned %ld\n", (unsigned long)avail);
287 /* calculate how much we can write to buffer */
288 if (avail > count)
289 avail = count;
290
291 if (stream->ops->copy) {
292 char __user* cbuf = (char __user*)buf;
293 retval = stream->ops->copy(stream, cbuf, avail);
294 } else {
295 retval = snd_compr_write_data(stream, buf, avail);
296 }
297 if (retval > 0)
298 stream->runtime->total_bytes_available += retval;
299
300 /* while initiating the stream, write should be called before START
301 * call, so in setup move state */
302 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
303 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
304 pr_debug("stream prepared, Houston we are good to go\n");
305 }
306
307 mutex_unlock(&stream->device->lock);
308 return retval;
309}
310
311
312static ssize_t snd_compr_read(struct file *f, char __user *buf,
313 size_t count, loff_t *offset)
314{
315 struct snd_compr_file *data = f->private_data;
316 struct snd_compr_stream *stream;
317 size_t avail;
318 int retval;
319
320 if (snd_BUG_ON(!data))
321 return -EFAULT;
322
323 stream = &data->stream;
324 mutex_lock(&stream->device->lock);
325
326 /* read is allowed when stream is running, paused, draining and setup
327 * (yes setup is state which we transition to after stop, so if user
328 * wants to read data after stop we allow that)
329 */
330 switch (stream->runtime->state) {
331 case SNDRV_PCM_STATE_OPEN:
332 case SNDRV_PCM_STATE_PREPARED:
333 case SNDRV_PCM_STATE_XRUN:
334 case SNDRV_PCM_STATE_SUSPENDED:
335 case SNDRV_PCM_STATE_DISCONNECTED:
336 retval = -EBADFD;
337 goto out;
338 }
339
340 avail = snd_compr_get_avail(stream);
341 pr_debug("avail returned %ld\n", (unsigned long)avail);
342 /* calculate how much we can read from buffer */
343 if (avail > count)
344 avail = count;
345
346 if (stream->ops->copy) {
347 retval = stream->ops->copy(stream, buf, avail);
348 } else {
349 retval = -ENXIO;
350 goto out;
351 }
352 if (retval > 0)
353 stream->runtime->total_bytes_transferred += retval;
354
355out:
356 mutex_unlock(&stream->device->lock);
357 return retval;
358}
359
360static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
361{
362 return -ENXIO;
363}
364
365static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
366{
367 if (stream->direction == SND_COMPRESS_PLAYBACK)
368 return POLLOUT | POLLWRNORM;
369 else
370 return POLLIN | POLLRDNORM;
371}
372
373static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
374{
375 struct snd_compr_file *data = f->private_data;
376 struct snd_compr_stream *stream;
377 size_t avail;
378 int retval = 0;
379
380 if (snd_BUG_ON(!data))
381 return -EFAULT;
382 stream = &data->stream;
383 if (snd_BUG_ON(!stream))
384 return -EFAULT;
385
386 mutex_lock(&stream->device->lock);
387 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
388 retval = -EBADFD;
389 goto out;
390 }
391 poll_wait(f, &stream->runtime->sleep, wait);
392
393 avail = snd_compr_get_avail(stream);
394 pr_debug("avail is %ld\n", (unsigned long)avail);
395 /* check if we have at least one fragment to fill */
396 switch (stream->runtime->state) {
397 case SNDRV_PCM_STATE_DRAINING:
398 /* stream has been woken up after drain is complete
399 * draining done so set stream state to stopped
400 */
401 retval = snd_compr_get_poll(stream);
402 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
403 break;
404 case SNDRV_PCM_STATE_RUNNING:
405 case SNDRV_PCM_STATE_PREPARED:
406 case SNDRV_PCM_STATE_PAUSED:
407 if (avail >= stream->runtime->fragment_size)
408 retval = snd_compr_get_poll(stream);
409 break;
410 default:
411 if (stream->direction == SND_COMPRESS_PLAYBACK)
412 retval = POLLOUT | POLLWRNORM | POLLERR;
413 else
414 retval = POLLIN | POLLRDNORM | POLLERR;
415 break;
416 }
417out:
418 mutex_unlock(&stream->device->lock);
419 return retval;
420}
421
422static int
423snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
424{
425 int retval;
426 struct snd_compr_caps caps;
427
428 if (!stream->ops->get_caps)
429 return -ENXIO;
430
431 memset(&caps, 0, sizeof(caps));
432 retval = stream->ops->get_caps(stream, &caps);
433 if (retval)
434 goto out;
435 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
436 retval = -EFAULT;
437out:
438 return retval;
439}
440
441static int
442snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
443{
444 int retval;
445 struct snd_compr_codec_caps *caps;
446
447 if (!stream->ops->get_codec_caps)
448 return -ENXIO;
449
450 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
451 if (!caps)
452 return -ENOMEM;
453
454 retval = stream->ops->get_codec_caps(stream, caps);
455 if (retval)
456 goto out;
457 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
458 retval = -EFAULT;
459
460out:
461 kfree(caps);
462 return retval;
463}
464
465/* revisit this with snd_pcm_preallocate_xxx */
466static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
467 struct snd_compr_params *params)
468{
469 unsigned int buffer_size;
470 void *buffer;
471
472 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
473 if (stream->ops->copy) {
474 buffer = NULL;
475 /* if copy is defined the driver will be required to copy
476 * the data from core
477 */
478 } else {
479 buffer = kmalloc(buffer_size, GFP_KERNEL);
480 if (!buffer)
481 return -ENOMEM;
482 }
483 stream->runtime->fragment_size = params->buffer.fragment_size;
484 stream->runtime->fragments = params->buffer.fragments;
485 stream->runtime->buffer = buffer;
486 stream->runtime->buffer_size = buffer_size;
487 return 0;
488}
489
490static int snd_compress_check_input(struct snd_compr_params *params)
491{
492 /* first let's check the buffer parameter's */
493 if (params->buffer.fragment_size == 0 ||
494 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
495 return -EINVAL;
496
497 /* now codec parameters */
498 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
499 return -EINVAL;
500
501 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
502 return -EINVAL;
503
504 return 0;
505}
506
507static int
508snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
509{
510 struct snd_compr_params *params;
511 int retval;
512
513 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
514 /*
515 * we should allow parameter change only when stream has been
516 * opened not in other cases
517 */
518 params = kmalloc(sizeof(*params), GFP_KERNEL);
519 if (!params)
520 return -ENOMEM;
521 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
522 retval = -EFAULT;
523 goto out;
524 }
525
526 retval = snd_compress_check_input(params);
527 if (retval)
528 goto out;
529
530 retval = snd_compr_allocate_buffer(stream, params);
531 if (retval) {
532 retval = -ENOMEM;
533 goto out;
534 }
535
536 retval = stream->ops->set_params(stream, params);
537 if (retval)
538 goto out;
539
540 stream->metadata_set = false;
541 stream->next_track = false;
542
543 if (stream->direction == SND_COMPRESS_PLAYBACK)
544 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
545 else
546 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
547 } else {
548 return -EPERM;
549 }
550out:
551 kfree(params);
552 return retval;
553}
554
555static int
556snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
557{
558 struct snd_codec *params;
559 int retval;
560
561 if (!stream->ops->get_params)
562 return -EBADFD;
563
564 params = kzalloc(sizeof(*params), GFP_KERNEL);
565 if (!params)
566 return -ENOMEM;
567 retval = stream->ops->get_params(stream, params);
568 if (retval)
569 goto out;
570 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
571 retval = -EFAULT;
572
573out:
574 kfree(params);
575 return retval;
576}
577
578static int
579snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
580{
581 struct snd_compr_metadata metadata;
582 int retval;
583
584 if (!stream->ops->get_metadata)
585 return -ENXIO;
586
587 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
588 return -EFAULT;
589
590 retval = stream->ops->get_metadata(stream, &metadata);
591 if (retval != 0)
592 return retval;
593
594 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
595 return -EFAULT;
596
597 return 0;
598}
599
600static int
601snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
602{
603 struct snd_compr_metadata metadata;
604 int retval;
605
606 if (!stream->ops->set_metadata)
607 return -ENXIO;
608 /*
609 * we should allow parameter change only when stream has been
610 * opened not in other cases
611 */
612 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
613 return -EFAULT;
614
615 retval = stream->ops->set_metadata(stream, &metadata);
616 stream->metadata_set = true;
617
618 return retval;
619}
620
621static inline int
622snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
623{
624 struct snd_compr_tstamp tstamp = {0};
625 int ret;
626
627 ret = snd_compr_update_tstamp(stream, &tstamp);
628 if (ret == 0)
629 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
630 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
631 return ret;
632}
633
634static int snd_compr_pause(struct snd_compr_stream *stream)
635{
636 int retval;
637
638 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
639 return -EPERM;
640 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
641 if (!retval)
642 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
643 return retval;
644}
645
646static int snd_compr_resume(struct snd_compr_stream *stream)
647{
648 int retval;
649
650 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
651 return -EPERM;
652 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
653 if (!retval)
654 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
655 return retval;
656}
657
658static int snd_compr_start(struct snd_compr_stream *stream)
659{
660 int retval;
661
662 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
663 return -EPERM;
664 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
665 if (!retval)
666 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
667 return retval;
668}
669
670static int snd_compr_stop(struct snd_compr_stream *stream)
671{
672 int retval;
673
674 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
675 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
676 return -EPERM;
677 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
678 if (!retval) {
679 snd_compr_drain_notify(stream);
680 stream->runtime->total_bytes_available = 0;
681 stream->runtime->total_bytes_transferred = 0;
682 }
683 return retval;
684}
685
686static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
687{
688 int ret;
689
690 /*
691 * We are called with lock held. So drop the lock while we wait for
692 * drain complete notfication from the driver
693 *
694 * It is expected that driver will notify the drain completion and then
695 * stream will be moved to SETUP state, even if draining resulted in an
696 * error. We can trigger next track after this.
697 */
698 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
699 mutex_unlock(&stream->device->lock);
700
701 /* we wait for drain to complete here, drain can return when
702 * interruption occurred, wait returned error or success.
703 * For the first two cases we don't do anything different here and
704 * return after waking up
705 */
706
707 ret = wait_event_interruptible(stream->runtime->sleep,
708 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
709 if (ret == -ERESTARTSYS)
710 pr_debug("wait aborted by a signal");
711 else if (ret)
712 pr_debug("wait for drain failed with %d\n", ret);
713
714
715 wake_up(&stream->runtime->sleep);
716 mutex_lock(&stream->device->lock);
717
718 return ret;
719}
720
721static int snd_compr_drain(struct snd_compr_stream *stream)
722{
723 int retval;
724
725 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
726 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
727 return -EPERM;
728
729 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
730 if (retval) {
731 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
732 wake_up(&stream->runtime->sleep);
733 return retval;
734 }
735
736 return snd_compress_wait_for_drain(stream);
737}
738
739static int snd_compr_next_track(struct snd_compr_stream *stream)
740{
741 int retval;
742
743 /* only a running stream can transition to next track */
744 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
745 return -EPERM;
746
747 /* you can signal next track isf this is intended to be a gapless stream
748 * and current track metadata is set
749 */
750 if (stream->metadata_set == false)
751 return -EPERM;
752
753 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
754 if (retval != 0)
755 return retval;
756 stream->metadata_set = false;
757 stream->next_track = true;
758 return 0;
759}
760
761static int snd_compr_partial_drain(struct snd_compr_stream *stream)
762{
763 int retval;
764 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
765 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
766 return -EPERM;
767 /* stream can be drained only when next track has been signalled */
768 if (stream->next_track == false)
769 return -EPERM;
770
771 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
772 if (retval) {
773 pr_debug("Partial drain returned failure\n");
774 wake_up(&stream->runtime->sleep);
775 return retval;
776 }
777
778 stream->next_track = false;
779 return snd_compress_wait_for_drain(stream);
780}
781
782static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
783{
784 struct snd_compr_file *data = f->private_data;
785 struct snd_compr_stream *stream;
786 int retval = -ENOTTY;
787
788 if (snd_BUG_ON(!data))
789 return -EFAULT;
790 stream = &data->stream;
791 if (snd_BUG_ON(!stream))
792 return -EFAULT;
793 mutex_lock(&stream->device->lock);
794 switch (_IOC_NR(cmd)) {
795 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
796 retval = put_user(SNDRV_COMPRESS_VERSION,
797 (int __user *)arg) ? -EFAULT : 0;
798 break;
799 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
800 retval = snd_compr_get_caps(stream, arg);
801 break;
802 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
803 retval = snd_compr_get_codec_caps(stream, arg);
804 break;
805 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
806 retval = snd_compr_set_params(stream, arg);
807 break;
808 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
809 retval = snd_compr_get_params(stream, arg);
810 break;
811 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
812 retval = snd_compr_set_metadata(stream, arg);
813 break;
814 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
815 retval = snd_compr_get_metadata(stream, arg);
816 break;
817 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
818 retval = snd_compr_tstamp(stream, arg);
819 break;
820 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
821 retval = snd_compr_ioctl_avail(stream, arg);
822 break;
823 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
824 retval = snd_compr_pause(stream);
825 break;
826 case _IOC_NR(SNDRV_COMPRESS_RESUME):
827 retval = snd_compr_resume(stream);
828 break;
829 case _IOC_NR(SNDRV_COMPRESS_START):
830 retval = snd_compr_start(stream);
831 break;
832 case _IOC_NR(SNDRV_COMPRESS_STOP):
833 retval = snd_compr_stop(stream);
834 break;
835 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
836 retval = snd_compr_drain(stream);
837 break;
838 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
839 retval = snd_compr_partial_drain(stream);
840 break;
841 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
842 retval = snd_compr_next_track(stream);
843 break;
844
845 }
846 mutex_unlock(&stream->device->lock);
847 return retval;
848}
849
850static const struct file_operations snd_compr_file_ops = {
851 .owner = THIS_MODULE,
852 .open = snd_compr_open,
853 .release = snd_compr_free,
854 .write = snd_compr_write,
855 .read = snd_compr_read,
856 .unlocked_ioctl = snd_compr_ioctl,
857 .mmap = snd_compr_mmap,
858 .poll = snd_compr_poll,
859};
860
861static int snd_compress_dev_register(struct snd_device *device)
862{
863 int ret = -EINVAL;
864 char str[16];
865 struct snd_compr *compr;
866
867 if (snd_BUG_ON(!device || !device->device_data))
868 return -EBADFD;
869 compr = device->device_data;
870
871 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
872 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
873 compr->direction);
874 /* register compressed device */
875 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
876 compr->device, &snd_compr_file_ops, compr, str);
877 if (ret < 0) {
878 pr_err("snd_register_device failed\n %d", ret);
879 return ret;
880 }
881 return ret;
882
883}
884
885static int snd_compress_dev_disconnect(struct snd_device *device)
886{
887 struct snd_compr *compr;
888
889 compr = device->device_data;
890 snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
891 compr->device);
892 return 0;
893}
894
895/*
896 * snd_compress_new: create new compress device
897 * @card: sound card pointer
898 * @device: device number
899 * @dirn: device direction, should be of type enum snd_compr_direction
900 * @compr: compress device pointer
901 */
902int snd_compress_new(struct snd_card *card, int device,
903 int dirn, struct snd_compr *compr)
904{
905 static struct snd_device_ops ops = {
906 .dev_free = NULL,
907 .dev_register = snd_compress_dev_register,
908 .dev_disconnect = snd_compress_dev_disconnect,
909 };
910
911 compr->card = card;
912 compr->device = device;
913 compr->direction = dirn;
914 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
915}
916EXPORT_SYMBOL_GPL(snd_compress_new);
917
918static int snd_compress_add_device(struct snd_compr *device)
919{
920 int ret;
921
922 if (!device->card)
923 return -EINVAL;
924
925 /* register the card */
926 ret = snd_card_register(device->card);
927 if (ret)
928 goto out;
929 return 0;
930
931out:
932 pr_err("failed with %d\n", ret);
933 return ret;
934
935}
936
937static int snd_compress_remove_device(struct snd_compr *device)
938{
939 return snd_card_free(device->card);
940}
941
942/**
943 * snd_compress_register - register compressed device
944 *
945 * @device: compressed device to register
946 */
947int snd_compress_register(struct snd_compr *device)
948{
949 int retval;
950
951 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
952 return -EINVAL;
953
954 pr_debug("Registering compressed device %s\n", device->name);
955 if (snd_BUG_ON(!device->ops->open))
956 return -EINVAL;
957 if (snd_BUG_ON(!device->ops->free))
958 return -EINVAL;
959 if (snd_BUG_ON(!device->ops->set_params))
960 return -EINVAL;
961 if (snd_BUG_ON(!device->ops->trigger))
962 return -EINVAL;
963
964 mutex_init(&device->lock);
965
966 /* register a compressed card */
967 mutex_lock(&device_mutex);
968 retval = snd_compress_add_device(device);
969 mutex_unlock(&device_mutex);
970 return retval;
971}
972EXPORT_SYMBOL_GPL(snd_compress_register);
973
974int snd_compress_deregister(struct snd_compr *device)
975{
976 pr_debug("Removing compressed device %s\n", device->name);
977 mutex_lock(&device_mutex);
978 snd_compress_remove_device(device);
979 mutex_unlock(&device_mutex);
980 return 0;
981}
982EXPORT_SYMBOL_GPL(snd_compress_deregister);
983
984static int __init snd_compress_init(void)
985{
986 return 0;
987}
988
989static void __exit snd_compress_exit(void)
990{
991}
992
993module_init(snd_compress_init);
994module_exit(snd_compress_exit);
995
996MODULE_DESCRIPTION("ALSA Compressed offload framework");
997MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
998MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * compress_core.c - compress offload core
4 *
5 * Copyright (C) 2011 Intel Corporation
6 * Authors: Vinod Koul <vinod.koul@linux.intel.com>
7 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 */
12#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
13#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
14
15#include <linux/file.h>
16#include <linux/fs.h>
17#include <linux/list.h>
18#include <linux/math64.h>
19#include <linux/mm.h>
20#include <linux/mutex.h>
21#include <linux/poll.h>
22#include <linux/slab.h>
23#include <linux/sched.h>
24#include <linux/types.h>
25#include <linux/uio.h>
26#include <linux/uaccess.h>
27#include <linux/module.h>
28#include <linux/compat.h>
29#include <sound/core.h>
30#include <sound/initval.h>
31#include <sound/info.h>
32#include <sound/compress_params.h>
33#include <sound/compress_offload.h>
34#include <sound/compress_driver.h>
35
36/* struct snd_compr_codec_caps overflows the ioctl bit size for some
37 * architectures, so we need to disable the relevant ioctls.
38 */
39#if _IOC_SIZEBITS < 14
40#define COMPR_CODEC_CAPS_OVERFLOW
41#endif
42
43/* TODO:
44 * - add substream support for multiple devices in case of
45 * SND_DYNAMIC_MINORS is not used
46 * - Multiple node representation
47 * driver should be able to register multiple nodes
48 */
49
50struct snd_compr_file {
51 unsigned long caps;
52 struct snd_compr_stream stream;
53};
54
55static void error_delayed_work(struct work_struct *work);
56
57/*
58 * a note on stream states used:
59 * we use following states in the compressed core
60 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
61 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
62 * calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
63 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
64 * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for
65 * playback only). User after setting up stream writes the data buffer
66 * before starting the stream.
67 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
68 * decoding/encoding and rendering/capturing data.
69 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
70 * by calling SNDRV_COMPRESS_DRAIN.
71 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
72 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
73 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
74 */
75static int snd_compr_open(struct inode *inode, struct file *f)
76{
77 struct snd_compr *compr;
78 struct snd_compr_file *data;
79 struct snd_compr_runtime *runtime;
80 enum snd_compr_direction dirn;
81 int maj = imajor(inode);
82 int ret;
83
84 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
85 dirn = SND_COMPRESS_PLAYBACK;
86 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
87 dirn = SND_COMPRESS_CAPTURE;
88 else
89 return -EINVAL;
90
91 if (maj == snd_major)
92 compr = snd_lookup_minor_data(iminor(inode),
93 SNDRV_DEVICE_TYPE_COMPRESS);
94 else
95 return -EBADFD;
96
97 if (compr == NULL) {
98 pr_err("no device data!!!\n");
99 return -ENODEV;
100 }
101
102 if (dirn != compr->direction) {
103 pr_err("this device doesn't support this direction\n");
104 snd_card_unref(compr->card);
105 return -EINVAL;
106 }
107
108 data = kzalloc(sizeof(*data), GFP_KERNEL);
109 if (!data) {
110 snd_card_unref(compr->card);
111 return -ENOMEM;
112 }
113
114 INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
115
116 data->stream.ops = compr->ops;
117 data->stream.direction = dirn;
118 data->stream.private_data = compr->private_data;
119 data->stream.device = compr;
120 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
121 if (!runtime) {
122 kfree(data);
123 snd_card_unref(compr->card);
124 return -ENOMEM;
125 }
126 runtime->state = SNDRV_PCM_STATE_OPEN;
127 init_waitqueue_head(&runtime->sleep);
128 data->stream.runtime = runtime;
129 f->private_data = (void *)data;
130 scoped_guard(mutex, &compr->lock)
131 ret = compr->ops->open(&data->stream);
132 if (ret) {
133 kfree(runtime);
134 kfree(data);
135 }
136 snd_card_unref(compr->card);
137 return ret;
138}
139
140static int snd_compr_free(struct inode *inode, struct file *f)
141{
142 struct snd_compr_file *data = f->private_data;
143 struct snd_compr_runtime *runtime = data->stream.runtime;
144
145 cancel_delayed_work_sync(&data->stream.error_work);
146
147 switch (runtime->state) {
148 case SNDRV_PCM_STATE_RUNNING:
149 case SNDRV_PCM_STATE_DRAINING:
150 case SNDRV_PCM_STATE_PAUSED:
151 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
152 break;
153 default:
154 break;
155 }
156
157 data->stream.ops->free(&data->stream);
158 if (!data->stream.runtime->dma_buffer_p)
159 kfree(data->stream.runtime->buffer);
160 kfree(data->stream.runtime);
161 kfree(data);
162 return 0;
163}
164
165static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
166 struct snd_compr_tstamp *tstamp)
167{
168 if (!stream->ops->pointer)
169 return -ENOTSUPP;
170 stream->ops->pointer(stream, tstamp);
171 pr_debug("dsp consumed till %d total %d bytes\n",
172 tstamp->byte_offset, tstamp->copied_total);
173 if (stream->direction == SND_COMPRESS_PLAYBACK)
174 stream->runtime->total_bytes_transferred = tstamp->copied_total;
175 else
176 stream->runtime->total_bytes_available = tstamp->copied_total;
177 return 0;
178}
179
180static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
181 struct snd_compr_avail *avail)
182{
183 memset(avail, 0, sizeof(*avail));
184 snd_compr_update_tstamp(stream, &avail->tstamp);
185 /* Still need to return avail even if tstamp can't be filled in */
186
187 if (stream->runtime->total_bytes_available == 0 &&
188 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
189 stream->direction == SND_COMPRESS_PLAYBACK) {
190 pr_debug("detected init and someone forgot to do a write\n");
191 return stream->runtime->buffer_size;
192 }
193 pr_debug("app wrote %lld, DSP consumed %lld\n",
194 stream->runtime->total_bytes_available,
195 stream->runtime->total_bytes_transferred);
196 if (stream->runtime->total_bytes_available ==
197 stream->runtime->total_bytes_transferred) {
198 if (stream->direction == SND_COMPRESS_PLAYBACK) {
199 pr_debug("both pointers are same, returning full avail\n");
200 return stream->runtime->buffer_size;
201 } else {
202 pr_debug("both pointers are same, returning no avail\n");
203 return 0;
204 }
205 }
206
207 avail->avail = stream->runtime->total_bytes_available -
208 stream->runtime->total_bytes_transferred;
209 if (stream->direction == SND_COMPRESS_PLAYBACK)
210 avail->avail = stream->runtime->buffer_size - avail->avail;
211
212 pr_debug("ret avail as %lld\n", avail->avail);
213 return avail->avail;
214}
215
216static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
217{
218 struct snd_compr_avail avail;
219
220 return snd_compr_calc_avail(stream, &avail);
221}
222
223static int
224snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
225{
226 struct snd_compr_avail ioctl_avail;
227 size_t avail;
228
229 avail = snd_compr_calc_avail(stream, &ioctl_avail);
230 ioctl_avail.avail = avail;
231
232 switch (stream->runtime->state) {
233 case SNDRV_PCM_STATE_OPEN:
234 return -EBADFD;
235 case SNDRV_PCM_STATE_XRUN:
236 return -EPIPE;
237 default:
238 break;
239 }
240
241 if (copy_to_user((__u64 __user *)arg,
242 &ioctl_avail, sizeof(ioctl_avail)))
243 return -EFAULT;
244 return 0;
245}
246
247static int snd_compr_write_data(struct snd_compr_stream *stream,
248 const char __user *buf, size_t count)
249{
250 void *dstn;
251 size_t copy;
252 struct snd_compr_runtime *runtime = stream->runtime;
253 /* 64-bit Modulus */
254 u64 app_pointer = div64_u64(runtime->total_bytes_available,
255 runtime->buffer_size);
256 app_pointer = runtime->total_bytes_available -
257 (app_pointer * runtime->buffer_size);
258
259 dstn = runtime->buffer + app_pointer;
260 pr_debug("copying %ld at %lld\n",
261 (unsigned long)count, app_pointer);
262 if (count < runtime->buffer_size - app_pointer) {
263 if (copy_from_user(dstn, buf, count))
264 return -EFAULT;
265 } else {
266 copy = runtime->buffer_size - app_pointer;
267 if (copy_from_user(dstn, buf, copy))
268 return -EFAULT;
269 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
270 return -EFAULT;
271 }
272 /* if DSP cares, let it know data has been written */
273 if (stream->ops->ack)
274 stream->ops->ack(stream, count);
275 return count;
276}
277
278static ssize_t snd_compr_write(struct file *f, const char __user *buf,
279 size_t count, loff_t *offset)
280{
281 struct snd_compr_file *data = f->private_data;
282 struct snd_compr_stream *stream;
283 size_t avail;
284 int retval;
285
286 if (snd_BUG_ON(!data))
287 return -EFAULT;
288
289 stream = &data->stream;
290 guard(mutex)(&stream->device->lock);
291 /* write is allowed when stream is running or has been steup */
292 switch (stream->runtime->state) {
293 case SNDRV_PCM_STATE_SETUP:
294 case SNDRV_PCM_STATE_PREPARED:
295 case SNDRV_PCM_STATE_RUNNING:
296 break;
297 default:
298 return -EBADFD;
299 }
300
301 avail = snd_compr_get_avail(stream);
302 pr_debug("avail returned %ld\n", (unsigned long)avail);
303 /* calculate how much we can write to buffer */
304 if (avail > count)
305 avail = count;
306
307 if (stream->ops->copy) {
308 char __user* cbuf = (char __user*)buf;
309 retval = stream->ops->copy(stream, cbuf, avail);
310 } else {
311 retval = snd_compr_write_data(stream, buf, avail);
312 }
313 if (retval > 0)
314 stream->runtime->total_bytes_available += retval;
315
316 /* while initiating the stream, write should be called before START
317 * call, so in setup move state */
318 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
319 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
320 pr_debug("stream prepared, Houston we are good to go\n");
321 }
322
323 return retval;
324}
325
326
327static ssize_t snd_compr_read(struct file *f, char __user *buf,
328 size_t count, loff_t *offset)
329{
330 struct snd_compr_file *data = f->private_data;
331 struct snd_compr_stream *stream;
332 size_t avail;
333 int retval;
334
335 if (snd_BUG_ON(!data))
336 return -EFAULT;
337
338 stream = &data->stream;
339 guard(mutex)(&stream->device->lock);
340
341 /* read is allowed when stream is running, paused, draining and setup
342 * (yes setup is state which we transition to after stop, so if user
343 * wants to read data after stop we allow that)
344 */
345 switch (stream->runtime->state) {
346 case SNDRV_PCM_STATE_OPEN:
347 case SNDRV_PCM_STATE_PREPARED:
348 case SNDRV_PCM_STATE_SUSPENDED:
349 case SNDRV_PCM_STATE_DISCONNECTED:
350 return -EBADFD;
351 case SNDRV_PCM_STATE_XRUN:
352 return -EPIPE;
353 }
354
355 avail = snd_compr_get_avail(stream);
356 pr_debug("avail returned %ld\n", (unsigned long)avail);
357 /* calculate how much we can read from buffer */
358 if (avail > count)
359 avail = count;
360
361 if (stream->ops->copy)
362 retval = stream->ops->copy(stream, buf, avail);
363 else
364 return -ENXIO;
365 if (retval > 0)
366 stream->runtime->total_bytes_transferred += retval;
367
368 return retval;
369}
370
371static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
372{
373 return -ENXIO;
374}
375
376static __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
377{
378 if (stream->direction == SND_COMPRESS_PLAYBACK)
379 return EPOLLOUT | EPOLLWRNORM;
380 else
381 return EPOLLIN | EPOLLRDNORM;
382}
383
384static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
385{
386 struct snd_compr_file *data = f->private_data;
387 struct snd_compr_stream *stream;
388 size_t avail;
389 __poll_t retval = 0;
390
391 if (snd_BUG_ON(!data))
392 return EPOLLERR;
393
394 stream = &data->stream;
395
396 guard(mutex)(&stream->device->lock);
397
398 switch (stream->runtime->state) {
399 case SNDRV_PCM_STATE_OPEN:
400 case SNDRV_PCM_STATE_XRUN:
401 return snd_compr_get_poll(stream) | EPOLLERR;
402 default:
403 break;
404 }
405
406 poll_wait(f, &stream->runtime->sleep, wait);
407
408 avail = snd_compr_get_avail(stream);
409 pr_debug("avail is %ld\n", (unsigned long)avail);
410 /* check if we have at least one fragment to fill */
411 switch (stream->runtime->state) {
412 case SNDRV_PCM_STATE_DRAINING:
413 /* stream has been woken up after drain is complete
414 * draining done so set stream state to stopped
415 */
416 retval = snd_compr_get_poll(stream);
417 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
418 break;
419 case SNDRV_PCM_STATE_RUNNING:
420 case SNDRV_PCM_STATE_PREPARED:
421 case SNDRV_PCM_STATE_PAUSED:
422 if (avail >= stream->runtime->fragment_size)
423 retval = snd_compr_get_poll(stream);
424 break;
425 default:
426 return snd_compr_get_poll(stream) | EPOLLERR;
427 }
428
429 return retval;
430}
431
432static int
433snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
434{
435 int retval;
436 struct snd_compr_caps caps;
437
438 if (!stream->ops->get_caps)
439 return -ENXIO;
440
441 memset(&caps, 0, sizeof(caps));
442 retval = stream->ops->get_caps(stream, &caps);
443 if (retval)
444 goto out;
445 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
446 retval = -EFAULT;
447out:
448 return retval;
449}
450
451#ifndef COMPR_CODEC_CAPS_OVERFLOW
452static int
453snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
454{
455 int retval;
456 struct snd_compr_codec_caps *caps __free(kfree) = NULL;
457
458 if (!stream->ops->get_codec_caps)
459 return -ENXIO;
460
461 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
462 if (!caps)
463 return -ENOMEM;
464
465 retval = stream->ops->get_codec_caps(stream, caps);
466 if (retval)
467 return retval;
468 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
469 return -EFAULT;
470 return retval;
471}
472#endif /* !COMPR_CODEC_CAPS_OVERFLOW */
473
474int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size)
475{
476 struct snd_dma_buffer *dmab;
477 int ret;
478
479 if (snd_BUG_ON(!(stream) || !(stream)->runtime))
480 return -EINVAL;
481 dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
482 if (!dmab)
483 return -ENOMEM;
484 dmab->dev = stream->dma_buffer.dev;
485 ret = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab);
486 if (ret < 0) {
487 kfree(dmab);
488 return ret;
489 }
490
491 snd_compr_set_runtime_buffer(stream, dmab);
492 stream->runtime->dma_bytes = size;
493 return 1;
494}
495EXPORT_SYMBOL(snd_compr_malloc_pages);
496
497int snd_compr_free_pages(struct snd_compr_stream *stream)
498{
499 struct snd_compr_runtime *runtime;
500
501 if (snd_BUG_ON(!(stream) || !(stream)->runtime))
502 return -EINVAL;
503 runtime = stream->runtime;
504 if (runtime->dma_area == NULL)
505 return 0;
506 if (runtime->dma_buffer_p != &stream->dma_buffer) {
507 /* It's a newly allocated buffer. Release it now. */
508 snd_dma_free_pages(runtime->dma_buffer_p);
509 kfree(runtime->dma_buffer_p);
510 }
511
512 snd_compr_set_runtime_buffer(stream, NULL);
513 return 0;
514}
515EXPORT_SYMBOL(snd_compr_free_pages);
516
517/* revisit this with snd_pcm_preallocate_xxx */
518static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
519 struct snd_compr_params *params)
520{
521 unsigned int buffer_size;
522 void *buffer = NULL;
523
524 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
525 if (stream->ops->copy) {
526 buffer = NULL;
527 /* if copy is defined the driver will be required to copy
528 * the data from core
529 */
530 } else {
531 if (stream->runtime->dma_buffer_p) {
532
533 if (buffer_size > stream->runtime->dma_buffer_p->bytes)
534 dev_err(stream->device->dev,
535 "Not enough DMA buffer");
536 else
537 buffer = stream->runtime->dma_buffer_p->area;
538
539 } else {
540 buffer = kmalloc(buffer_size, GFP_KERNEL);
541 }
542
543 if (!buffer)
544 return -ENOMEM;
545 }
546 stream->runtime->fragment_size = params->buffer.fragment_size;
547 stream->runtime->fragments = params->buffer.fragments;
548 stream->runtime->buffer = buffer;
549 stream->runtime->buffer_size = buffer_size;
550 return 0;
551}
552
553static int snd_compress_check_input(struct snd_compr_params *params)
554{
555 /* first let's check the buffer parameter's */
556 if (params->buffer.fragment_size == 0 ||
557 params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
558 params->buffer.fragments == 0)
559 return -EINVAL;
560
561 /* now codec parameters */
562 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
563 return -EINVAL;
564
565 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
566 return -EINVAL;
567
568 return 0;
569}
570
571static int
572snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
573{
574 struct snd_compr_params *params __free(kfree) = NULL;
575 int retval;
576
577 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN || stream->next_track) {
578 /*
579 * we should allow parameter change only when stream has been
580 * opened not in other cases
581 */
582 params = memdup_user((void __user *)arg, sizeof(*params));
583 if (IS_ERR(params))
584 return PTR_ERR(no_free_ptr(params));
585
586 retval = snd_compress_check_input(params);
587 if (retval)
588 return retval;
589
590 retval = snd_compr_allocate_buffer(stream, params);
591 if (retval)
592 return -ENOMEM;
593
594 retval = stream->ops->set_params(stream, params);
595 if (retval)
596 return retval;
597
598 if (stream->next_track)
599 return retval;
600
601 stream->metadata_set = false;
602 stream->next_track = false;
603
604 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
605 } else {
606 return -EPERM;
607 }
608 return retval;
609}
610
611static int
612snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
613{
614 struct snd_codec *params __free(kfree) = NULL;
615 int retval;
616
617 if (!stream->ops->get_params)
618 return -EBADFD;
619
620 params = kzalloc(sizeof(*params), GFP_KERNEL);
621 if (!params)
622 return -ENOMEM;
623 retval = stream->ops->get_params(stream, params);
624 if (retval)
625 return retval;
626 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
627 return -EFAULT;
628 return retval;
629}
630
631static int
632snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
633{
634 struct snd_compr_metadata metadata;
635 int retval;
636
637 if (!stream->ops->get_metadata)
638 return -ENXIO;
639
640 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
641 return -EFAULT;
642
643 retval = stream->ops->get_metadata(stream, &metadata);
644 if (retval != 0)
645 return retval;
646
647 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
648 return -EFAULT;
649
650 return 0;
651}
652
653static int
654snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
655{
656 struct snd_compr_metadata metadata;
657 int retval;
658
659 if (!stream->ops->set_metadata)
660 return -ENXIO;
661 /*
662 * we should allow parameter change only when stream has been
663 * opened not in other cases
664 */
665 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
666 return -EFAULT;
667
668 retval = stream->ops->set_metadata(stream, &metadata);
669 stream->metadata_set = true;
670
671 return retval;
672}
673
674static inline int
675snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
676{
677 struct snd_compr_tstamp tstamp = {0};
678 int ret;
679
680 ret = snd_compr_update_tstamp(stream, &tstamp);
681 if (ret == 0)
682 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
683 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
684 return ret;
685}
686
687static int snd_compr_pause(struct snd_compr_stream *stream)
688{
689 int retval;
690
691 switch (stream->runtime->state) {
692 case SNDRV_PCM_STATE_RUNNING:
693 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
694 if (!retval)
695 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
696 break;
697 case SNDRV_PCM_STATE_DRAINING:
698 if (!stream->device->use_pause_in_draining)
699 return -EPERM;
700 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
701 if (!retval)
702 stream->pause_in_draining = true;
703 break;
704 default:
705 return -EPERM;
706 }
707 return retval;
708}
709
710static int snd_compr_resume(struct snd_compr_stream *stream)
711{
712 int retval;
713
714 switch (stream->runtime->state) {
715 case SNDRV_PCM_STATE_PAUSED:
716 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
717 if (!retval)
718 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
719 break;
720 case SNDRV_PCM_STATE_DRAINING:
721 if (!stream->pause_in_draining)
722 return -EPERM;
723 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
724 if (!retval)
725 stream->pause_in_draining = false;
726 break;
727 default:
728 return -EPERM;
729 }
730 return retval;
731}
732
733static int snd_compr_start(struct snd_compr_stream *stream)
734{
735 int retval;
736
737 switch (stream->runtime->state) {
738 case SNDRV_PCM_STATE_SETUP:
739 if (stream->direction != SND_COMPRESS_CAPTURE)
740 return -EPERM;
741 break;
742 case SNDRV_PCM_STATE_PREPARED:
743 break;
744 default:
745 return -EPERM;
746 }
747
748 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
749 if (!retval)
750 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
751 return retval;
752}
753
754static int snd_compr_stop(struct snd_compr_stream *stream)
755{
756 int retval;
757
758 switch (stream->runtime->state) {
759 case SNDRV_PCM_STATE_OPEN:
760 case SNDRV_PCM_STATE_SETUP:
761 case SNDRV_PCM_STATE_PREPARED:
762 return -EPERM;
763 default:
764 break;
765 }
766
767 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
768 if (!retval) {
769 /* clear flags and stop any drain wait */
770 stream->partial_drain = false;
771 stream->metadata_set = false;
772 stream->pause_in_draining = false;
773 snd_compr_drain_notify(stream);
774 stream->runtime->total_bytes_available = 0;
775 stream->runtime->total_bytes_transferred = 0;
776 }
777 return retval;
778}
779
780static void error_delayed_work(struct work_struct *work)
781{
782 struct snd_compr_stream *stream;
783
784 stream = container_of(work, struct snd_compr_stream, error_work.work);
785
786 guard(mutex)(&stream->device->lock);
787
788 stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
789 wake_up(&stream->runtime->sleep);
790}
791
792/**
793 * snd_compr_stop_error: Report a fatal error on a stream
794 * @stream: pointer to stream
795 * @state: state to transition the stream to
796 *
797 * Stop the stream and set its state.
798 *
799 * Should be called with compressed device lock held.
800 *
801 * Return: zero if successful, or a negative error code
802 */
803int snd_compr_stop_error(struct snd_compr_stream *stream,
804 snd_pcm_state_t state)
805{
806 if (stream->runtime->state == state)
807 return 0;
808
809 stream->runtime->state = state;
810
811 pr_debug("Changing state to: %d\n", state);
812
813 queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
814
815 return 0;
816}
817EXPORT_SYMBOL_GPL(snd_compr_stop_error);
818
819static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
820{
821 int ret;
822
823 /*
824 * We are called with lock held. So drop the lock while we wait for
825 * drain complete notification from the driver
826 *
827 * It is expected that driver will notify the drain completion and then
828 * stream will be moved to SETUP state, even if draining resulted in an
829 * error. We can trigger next track after this.
830 */
831 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
832 mutex_unlock(&stream->device->lock);
833
834 /* we wait for drain to complete here, drain can return when
835 * interruption occurred, wait returned error or success.
836 * For the first two cases we don't do anything different here and
837 * return after waking up
838 */
839
840 ret = wait_event_interruptible(stream->runtime->sleep,
841 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
842 if (ret == -ERESTARTSYS)
843 pr_debug("wait aborted by a signal\n");
844 else if (ret)
845 pr_debug("wait for drain failed with %d\n", ret);
846
847
848 wake_up(&stream->runtime->sleep);
849 mutex_lock(&stream->device->lock);
850
851 return ret;
852}
853
854static int snd_compr_drain(struct snd_compr_stream *stream)
855{
856 int retval;
857
858 switch (stream->runtime->state) {
859 case SNDRV_PCM_STATE_OPEN:
860 case SNDRV_PCM_STATE_SETUP:
861 case SNDRV_PCM_STATE_PREPARED:
862 case SNDRV_PCM_STATE_PAUSED:
863 return -EPERM;
864 case SNDRV_PCM_STATE_XRUN:
865 return -EPIPE;
866 default:
867 break;
868 }
869
870 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
871 if (retval) {
872 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
873 wake_up(&stream->runtime->sleep);
874 return retval;
875 }
876
877 return snd_compress_wait_for_drain(stream);
878}
879
880static int snd_compr_next_track(struct snd_compr_stream *stream)
881{
882 int retval;
883
884 /* only a running stream can transition to next track */
885 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
886 return -EPERM;
887
888 /* next track doesn't have any meaning for capture streams */
889 if (stream->direction == SND_COMPRESS_CAPTURE)
890 return -EPERM;
891
892 /* you can signal next track if this is intended to be a gapless stream
893 * and current track metadata is set
894 */
895 if (stream->metadata_set == false)
896 return -EPERM;
897
898 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
899 if (retval != 0)
900 return retval;
901 stream->metadata_set = false;
902 stream->next_track = true;
903 return 0;
904}
905
906static int snd_compr_partial_drain(struct snd_compr_stream *stream)
907{
908 int retval;
909
910 switch (stream->runtime->state) {
911 case SNDRV_PCM_STATE_OPEN:
912 case SNDRV_PCM_STATE_SETUP:
913 case SNDRV_PCM_STATE_PREPARED:
914 case SNDRV_PCM_STATE_PAUSED:
915 return -EPERM;
916 case SNDRV_PCM_STATE_XRUN:
917 return -EPIPE;
918 default:
919 break;
920 }
921
922 /* partial drain doesn't have any meaning for capture streams */
923 if (stream->direction == SND_COMPRESS_CAPTURE)
924 return -EPERM;
925
926 /* stream can be drained only when next track has been signalled */
927 if (stream->next_track == false)
928 return -EPERM;
929
930 stream->partial_drain = true;
931 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
932 if (retval) {
933 pr_debug("Partial drain returned failure\n");
934 wake_up(&stream->runtime->sleep);
935 return retval;
936 }
937
938 stream->next_track = false;
939 return snd_compress_wait_for_drain(stream);
940}
941
942static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
943{
944 struct snd_compr_file *data = f->private_data;
945 struct snd_compr_stream *stream;
946
947 if (snd_BUG_ON(!data))
948 return -EFAULT;
949
950 stream = &data->stream;
951
952 guard(mutex)(&stream->device->lock);
953 switch (_IOC_NR(cmd)) {
954 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
955 return put_user(SNDRV_COMPRESS_VERSION,
956 (int __user *)arg) ? -EFAULT : 0;
957 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
958 return snd_compr_get_caps(stream, arg);
959#ifndef COMPR_CODEC_CAPS_OVERFLOW
960 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
961 return snd_compr_get_codec_caps(stream, arg);
962#endif
963 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
964 return snd_compr_set_params(stream, arg);
965 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
966 return snd_compr_get_params(stream, arg);
967 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
968 return snd_compr_set_metadata(stream, arg);
969 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
970 return snd_compr_get_metadata(stream, arg);
971 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
972 return snd_compr_tstamp(stream, arg);
973 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
974 return snd_compr_ioctl_avail(stream, arg);
975 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
976 return snd_compr_pause(stream);
977 case _IOC_NR(SNDRV_COMPRESS_RESUME):
978 return snd_compr_resume(stream);
979 case _IOC_NR(SNDRV_COMPRESS_START):
980 return snd_compr_start(stream);
981 case _IOC_NR(SNDRV_COMPRESS_STOP):
982 return snd_compr_stop(stream);
983 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
984 return snd_compr_drain(stream);
985 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
986 return snd_compr_partial_drain(stream);
987 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
988 return snd_compr_next_track(stream);
989 }
990
991 return -ENOTTY;
992}
993
994/* support of 32bit userspace on 64bit platforms */
995#ifdef CONFIG_COMPAT
996static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
997 unsigned long arg)
998{
999 return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
1000}
1001#endif
1002
1003static const struct file_operations snd_compr_file_ops = {
1004 .owner = THIS_MODULE,
1005 .open = snd_compr_open,
1006 .release = snd_compr_free,
1007 .write = snd_compr_write,
1008 .read = snd_compr_read,
1009 .unlocked_ioctl = snd_compr_ioctl,
1010#ifdef CONFIG_COMPAT
1011 .compat_ioctl = snd_compr_ioctl_compat,
1012#endif
1013 .mmap = snd_compr_mmap,
1014 .poll = snd_compr_poll,
1015};
1016
1017static int snd_compress_dev_register(struct snd_device *device)
1018{
1019 int ret;
1020 struct snd_compr *compr;
1021
1022 if (snd_BUG_ON(!device || !device->device_data))
1023 return -EBADFD;
1024 compr = device->device_data;
1025
1026 pr_debug("reg device %s, direction %d\n", compr->name,
1027 compr->direction);
1028 /* register compressed device */
1029 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
1030 compr->card, compr->device,
1031 &snd_compr_file_ops, compr, compr->dev);
1032 if (ret < 0) {
1033 pr_err("snd_register_device failed %d\n", ret);
1034 return ret;
1035 }
1036 return ret;
1037
1038}
1039
1040static int snd_compress_dev_disconnect(struct snd_device *device)
1041{
1042 struct snd_compr *compr;
1043
1044 compr = device->device_data;
1045 snd_unregister_device(compr->dev);
1046 return 0;
1047}
1048
1049#ifdef CONFIG_SND_VERBOSE_PROCFS
1050static void snd_compress_proc_info_read(struct snd_info_entry *entry,
1051 struct snd_info_buffer *buffer)
1052{
1053 struct snd_compr *compr = (struct snd_compr *)entry->private_data;
1054
1055 snd_iprintf(buffer, "card: %d\n", compr->card->number);
1056 snd_iprintf(buffer, "device: %d\n", compr->device);
1057 snd_iprintf(buffer, "stream: %s\n",
1058 compr->direction == SND_COMPRESS_PLAYBACK
1059 ? "PLAYBACK" : "CAPTURE");
1060 snd_iprintf(buffer, "id: %s\n", compr->id);
1061}
1062
1063static int snd_compress_proc_init(struct snd_compr *compr)
1064{
1065 struct snd_info_entry *entry;
1066 char name[16];
1067
1068 sprintf(name, "compr%i", compr->device);
1069 entry = snd_info_create_card_entry(compr->card, name,
1070 compr->card->proc_root);
1071 if (!entry)
1072 return -ENOMEM;
1073 entry->mode = S_IFDIR | 0555;
1074 compr->proc_root = entry;
1075
1076 entry = snd_info_create_card_entry(compr->card, "info",
1077 compr->proc_root);
1078 if (entry)
1079 snd_info_set_text_ops(entry, compr,
1080 snd_compress_proc_info_read);
1081 compr->proc_info_entry = entry;
1082
1083 return 0;
1084}
1085
1086static void snd_compress_proc_done(struct snd_compr *compr)
1087{
1088 snd_info_free_entry(compr->proc_info_entry);
1089 compr->proc_info_entry = NULL;
1090 snd_info_free_entry(compr->proc_root);
1091 compr->proc_root = NULL;
1092}
1093
1094static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1095{
1096 strscpy(compr->id, id, sizeof(compr->id));
1097}
1098#else
1099static inline int snd_compress_proc_init(struct snd_compr *compr)
1100{
1101 return 0;
1102}
1103
1104static inline void snd_compress_proc_done(struct snd_compr *compr)
1105{
1106}
1107
1108static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1109{
1110}
1111#endif
1112
1113static int snd_compress_dev_free(struct snd_device *device)
1114{
1115 struct snd_compr *compr;
1116
1117 compr = device->device_data;
1118 snd_compress_proc_done(compr);
1119 put_device(compr->dev);
1120 return 0;
1121}
1122
1123/**
1124 * snd_compress_new: create new compress device
1125 * @card: sound card pointer
1126 * @device: device number
1127 * @dirn: device direction, should be of type enum snd_compr_direction
1128 * @id: ID string
1129 * @compr: compress device pointer
1130 *
1131 * Return: zero if successful, or a negative error code
1132 */
1133int snd_compress_new(struct snd_card *card, int device,
1134 int dirn, const char *id, struct snd_compr *compr)
1135{
1136 static const struct snd_device_ops ops = {
1137 .dev_free = snd_compress_dev_free,
1138 .dev_register = snd_compress_dev_register,
1139 .dev_disconnect = snd_compress_dev_disconnect,
1140 };
1141 int ret;
1142
1143 compr->card = card;
1144 compr->device = device;
1145 compr->direction = dirn;
1146 mutex_init(&compr->lock);
1147
1148 snd_compress_set_id(compr, id);
1149
1150 ret = snd_device_alloc(&compr->dev, card);
1151 if (ret)
1152 return ret;
1153 dev_set_name(compr->dev, "comprC%iD%i", card->number, device);
1154
1155 ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1156 if (ret == 0)
1157 snd_compress_proc_init(compr);
1158 else
1159 put_device(compr->dev);
1160
1161 return ret;
1162}
1163EXPORT_SYMBOL_GPL(snd_compress_new);
1164
1165MODULE_DESCRIPTION("ALSA Compressed offload framework");
1166MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1167MODULE_LICENSE("GPL v2");