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ALSA: hda - Remove speaker clicks on CX20549
[linux-2.6-block.git] / sound / core / compress_offload.c
CommitLineData
b21c60a4
VK		 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/mm.h>
32#include <linux/mutex.h>
33#include <linux/poll.h>
34#include <linux/slab.h>
35#include <linux/sched.h>
36#include <linux/uio.h>
37#include <linux/uaccess.h>
38#include <linux/module.h>
39#include <sound/core.h>
40#include <sound/initval.h>
41#include <sound/compress_params.h>
42#include <sound/compress_offload.h>
43#include <sound/compress_driver.h>
44
45/* TODO:
46 * - add substream support for multiple devices in case of
47 * SND_DYNAMIC_MINORS is not used
48 * - Multiple node representation
49 * driver should be able to register multiple nodes
50 */
51
52static DEFINE_MUTEX(device_mutex);
53
54struct snd_compr_file {
55 unsigned long caps;
56 struct snd_compr_stream stream;
57};
58
59/*
60 * a note on stream states used:
61 * we use follwing states in the compressed core
62 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
63 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
64 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
65 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
66 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
67 * decoding/encoding and rendering/capturing data.
68 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
69 * by calling SNDRV_COMPRESS_DRAIN.
70 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
71 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
72 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
73 */
74static int snd_compr_open(struct inode *inode, struct file *f)
75{
76 struct snd_compr *compr;
77 struct snd_compr_file *data;
78 struct snd_compr_runtime *runtime;
79 enum snd_compr_direction dirn;
80 int maj = imajor(inode);
81 int ret;
82
81cb3246 83 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
b21c60a4 84 dirn = SND_COMPRESS_PLAYBACK;
81cb3246 85 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
b21c60a4 86 dirn = SND_COMPRESS_CAPTURE;
81cb3246 87 else
b21c60a4 88 return -EINVAL;
b21c60a4
VK		 89
90 if (maj == snd_major)
91 compr = snd_lookup_minor_data(iminor(inode),
92 SNDRV_DEVICE_TYPE_COMPRESS);
93 else
94 return -EBADFD;
95
96 if (compr == NULL) {
97 pr_err("no device data!!!\n");
98 return -ENODEV;
99 }
100
101 if (dirn != compr->direction) {
102 pr_err("this device doesn't support this direction\n");
a0830dbd 103 snd_card_unref(compr->card);
b21c60a4
VK		 104 return -EINVAL;
105 }
106
107 data = kzalloc(sizeof(*data), GFP_KERNEL);
a0830dbd
TI		 108 if (!data) {
109 snd_card_unref(compr->card);
b21c60a4 110 return -ENOMEM;
a0830dbd 111 }
b21c60a4
VK		 112 data->stream.ops = compr->ops;
113 data->stream.direction = dirn;
114 data->stream.private_data = compr->private_data;
115 data->stream.device = compr;
116 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
117 if (!runtime) {
118 kfree(data);
a0830dbd 119 snd_card_unref(compr->card);
b21c60a4
VK		 120 return -ENOMEM;
121 }
122 runtime->state = SNDRV_PCM_STATE_OPEN;
123 init_waitqueue_head(&runtime->sleep);
124 data->stream.runtime = runtime;
125 f->private_data = (void *)data;
126 mutex_lock(&compr->lock);
127 ret = compr->ops->open(&data->stream);
128 mutex_unlock(&compr->lock);
129 if (ret) {
130 kfree(runtime);
131 kfree(data);
132 }
a0830dbd
TI		 133 snd_card_unref(compr->card);
134 return 0;
b21c60a4
VK		 135}
136
137static int snd_compr_free(struct inode *inode, struct file *f)
138{
139 struct snd_compr_file *data = f->private_data;
140 data->stream.ops->free(&data->stream);
141 kfree(data->stream.runtime->buffer);
142 kfree(data->stream.runtime);
143 kfree(data);
144 return 0;
145}
146
17ac8e5c 147static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
b21c60a4
VK		 148 struct snd_compr_tstamp *tstamp)
149{
150 if (!stream->ops->pointer)
17ac8e5c 151 return -ENOTSUPP;
b21c60a4
VK		 152 stream->ops->pointer(stream, tstamp);
153 pr_debug("dsp consumed till %d total %d bytes\n",
154 tstamp->byte_offset, tstamp->copied_total);
155 stream->runtime->hw_pointer = tstamp->byte_offset;
156 stream->runtime->total_bytes_transferred = tstamp->copied_total;
17ac8e5c 157 return 0;
b21c60a4
VK		 158}
159
160static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
161 struct snd_compr_avail *avail)
162{
163 long avail_calc; /*this needs to be signed variable */
164
17ac8e5c 165 memset(avail, 0, sizeof(*avail));
b21c60a4 166 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 167 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4
VK		 168
169 /* FIXME: This needs to be different for capture stream,
170 available is # of compressed data, for playback it's
171 remainder of buffer */
172
173 if (stream->runtime->total_bytes_available == 0 &&
174 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
175 pr_debug("detected init and someone forgot to do a write\n");
176 return stream->runtime->buffer_size;
177 }
178 pr_debug("app wrote %lld, DSP consumed %lld\n",
179 stream->runtime->total_bytes_available,
180 stream->runtime->total_bytes_transferred);
181 if (stream->runtime->total_bytes_available ==
182 stream->runtime->total_bytes_transferred) {
183 pr_debug("both pointers are same, returning full avail\n");
184 return stream->runtime->buffer_size;
185 }
186
187 /* FIXME: this routine isn't consistent, in one test we use
188 * cumulative values and in the other byte offsets. Do we
189 * really need the byte offsets if the cumulative values have
190 * been updated? In the PCM interface app_ptr and hw_ptr are
191 * already cumulative */
192
193 avail_calc = stream->runtime->buffer_size -
194 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
195 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
196 stream->runtime->app_pointer,
197 stream->runtime->hw_pointer);
198 if (avail_calc >= stream->runtime->buffer_size)
199 avail_calc -= stream->runtime->buffer_size;
200 pr_debug("ret avail as %ld\n", avail_calc);
201 avail->avail = avail_calc;
202 return avail_calc;
203}
204
205static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
206{
207 struct snd_compr_avail avail;
208
209 return snd_compr_calc_avail(stream, &avail);
210}
211
212static int
213snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
214{
215 struct snd_compr_avail ioctl_avail;
216 size_t avail;
217
218 avail = snd_compr_calc_avail(stream, &ioctl_avail);
219 ioctl_avail.avail = avail;
220
221 if (copy_to_user((__u64 __user *)arg,
222 &ioctl_avail, sizeof(ioctl_avail)))
223 return -EFAULT;
224 return 0;
225}
226
227static int snd_compr_write_data(struct snd_compr_stream *stream,
228 const char __user *buf, size_t count)
229{
230 void *dstn;
231 size_t copy;
232 struct snd_compr_runtime *runtime = stream->runtime;
233
234 dstn = runtime->buffer + runtime->app_pointer;
235 pr_debug("copying %ld at %lld\n",
236 (unsigned long)count, runtime->app_pointer);
237 if (count < runtime->buffer_size - runtime->app_pointer) {
238 if (copy_from_user(dstn, buf, count))
239 return -EFAULT;
240 runtime->app_pointer += count;
241 } else {
242 copy = runtime->buffer_size - runtime->app_pointer;
243 if (copy_from_user(dstn, buf, copy))
244 return -EFAULT;
245 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
246 return -EFAULT;
247 runtime->app_pointer = count - copy;
248 }
249 /* if DSP cares, let it know data has been written */
250 if (stream->ops->ack)
251 stream->ops->ack(stream, count);
252 return count;
253}
254
255static ssize_t snd_compr_write(struct file *f, const char __user *buf,
256 size_t count, loff_t *offset)
257{
258 struct snd_compr_file *data = f->private_data;
259 struct snd_compr_stream *stream;
260 size_t avail;
261 int retval;
262
263 if (snd_BUG_ON(!data))
264 return -EFAULT;
265
266 stream = &data->stream;
267 mutex_lock(&stream->device->lock);
268 /* write is allowed when stream is running or has been steup */
269 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
270 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
271 mutex_unlock(&stream->device->lock);
272 return -EBADFD;
273 }
274
275 avail = snd_compr_get_avail(stream);
276 pr_debug("avail returned %ld\n", (unsigned long)avail);
277 /* calculate how much we can write to buffer */
278 if (avail > count)
279 avail = count;
280
281 if (stream->ops->copy)
282 retval = stream->ops->copy(stream, buf, avail);
283 else
284 retval = snd_compr_write_data(stream, buf, avail);
285 if (retval > 0)
286 stream->runtime->total_bytes_available += retval;
287
288 /* while initiating the stream, write should be called before START
289 * call, so in setup move state */
290 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
291 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
292 pr_debug("stream prepared, Houston we are good to go\n");
293 }
294
295 mutex_unlock(&stream->device->lock);
296 return retval;
297}
298
299
300static ssize_t snd_compr_read(struct file *f, char __user *buf,
301 size_t count, loff_t *offset)
302{
303 return -ENXIO;
304}
305
306static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
307{
308 return -ENXIO;
309}
310
311static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
312{
313 if (stream->direction == SND_COMPRESS_PLAYBACK)
314 return POLLOUT | POLLWRNORM;
315 else
316 return POLLIN | POLLRDNORM;
317}
318
319static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
320{
321 struct snd_compr_file *data = f->private_data;
322 struct snd_compr_stream *stream;
323 size_t avail;
324 int retval = 0;
325
326 if (snd_BUG_ON(!data))
327 return -EFAULT;
328 stream = &data->stream;
329 if (snd_BUG_ON(!stream))
330 return -EFAULT;
331
332 mutex_lock(&stream->device->lock);
333 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
334 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
335 retval = -EBADFD;
336 goto out;
337 }
338 poll_wait(f, &stream->runtime->sleep, wait);
339
340 avail = snd_compr_get_avail(stream);
341 pr_debug("avail is %ld\n", (unsigned long)avail);
342 /* check if we have at least one fragment to fill */
343 switch (stream->runtime->state) {
344 case SNDRV_PCM_STATE_DRAINING:
345 /* stream has been woken up after drain is complete
346 * draining done so set stream state to stopped
347 */
348 retval = snd_compr_get_poll(stream);
349 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
350 break;
351 case SNDRV_PCM_STATE_RUNNING:
352 case SNDRV_PCM_STATE_PREPARED:
353 case SNDRV_PCM_STATE_PAUSED:
354 if (avail >= stream->runtime->fragment_size)
355 retval = snd_compr_get_poll(stream);
356 break;
357 default:
358 if (stream->direction == SND_COMPRESS_PLAYBACK)
359 retval = POLLOUT | POLLWRNORM | POLLERR;
360 else
361 retval = POLLIN | POLLRDNORM | POLLERR;
362 break;
363 }
364out:
365 mutex_unlock(&stream->device->lock);
366 return retval;
367}
368
369static int
370snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
371{
372 int retval;
373 struct snd_compr_caps caps;
374
375 if (!stream->ops->get_caps)
376 return -ENXIO;
377
378 retval = stream->ops->get_caps(stream, &caps);
379 if (retval)
380 goto out;
381 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
382 retval = -EFAULT;
383out:
384 return retval;
385}
386
387static int
388snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
389{
390 int retval;
391 struct snd_compr_codec_caps *caps;
392
393 if (!stream->ops->get_codec_caps)
394 return -ENXIO;
395
396 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
397 if (!caps)
398 return -ENOMEM;
399
400 retval = stream->ops->get_codec_caps(stream, caps);
401 if (retval)
402 goto out;
403 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
404 retval = -EFAULT;
405
406out:
407 kfree(caps);
408 return retval;
409}
410
411/* revisit this with snd_pcm_preallocate_xxx */
412static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
413 struct snd_compr_params *params)
414{
415 unsigned int buffer_size;
416 void *buffer;
417
418 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
419 if (stream->ops->copy) {
420 buffer = NULL;
421 /* if copy is defined the driver will be required to copy
422 * the data from core
423 */
424 } else {
425 buffer = kmalloc(buffer_size, GFP_KERNEL);
426 if (!buffer)
427 return -ENOMEM;
428 }
429 stream->runtime->fragment_size = params->buffer.fragment_size;
430 stream->runtime->fragments = params->buffer.fragments;
431 stream->runtime->buffer = buffer;
432 stream->runtime->buffer_size = buffer_size;
433 return 0;
434}
435
4dc040a0
VK		 436static int snd_compress_check_input(struct snd_compr_params *params)
437{
438 /* first let's check the buffer parameter's */
439 if (params->buffer.fragment_size == 0 ||
440 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
441 return -EINVAL;
442
fb4a9779
VK		 443 /* now codec parameters */
444 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
445 return -EINVAL;
446
447 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
448 return -EINVAL;
449
450 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
451 return -EINVAL;
452
4dc040a0
VK		 453 return 0;
454}
455
b21c60a4
VK		 456static int
457snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
458{
459 struct snd_compr_params *params;
460 int retval;
461
462 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
463 /*
464 * we should allow parameter change only when stream has been
465 * opened not in other cases
466 */
467 params = kmalloc(sizeof(*params), GFP_KERNEL);
468 if (!params)
469 return -ENOMEM;
769fab2a
JJ		 470 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
471 retval = -EFAULT;
472 goto out;
473 }
4dc040a0
VK		 474
475 retval = snd_compress_check_input(params);
476 if (retval)
477 goto out;
478
b21c60a4
VK		 479 retval = snd_compr_allocate_buffer(stream, params);
480 if (retval) {
769fab2a
JJ		 481 retval = -ENOMEM;
482 goto out;
b21c60a4 483 }
4dc040a0 484
b21c60a4
VK		 485 retval = stream->ops->set_params(stream, params);
486 if (retval)
487 goto out;
488 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
769fab2a 489 } else {
b21c60a4 490 return -EPERM;
769fab2a 491 }
b21c60a4
VK		 492out:
493 kfree(params);
494 return retval;
495}
496
497static int
498snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
499{
500 struct snd_codec *params;
501 int retval;
502
503 if (!stream->ops->get_params)
504 return -EBADFD;
505
506 params = kmalloc(sizeof(*params), GFP_KERNEL);
507 if (!params)
508 return -ENOMEM;
509 retval = stream->ops->get_params(stream, params);
510 if (retval)
511 goto out;
512 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
513 retval = -EFAULT;
514
515out:
516 kfree(params);
517 return retval;
518}
519
520static inline int
521snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
522{
17ac8e5c
RF		 523 struct snd_compr_tstamp tstamp = {0};
524 int ret;
b21c60a4 525
17ac8e5c
RF		 526 ret = snd_compr_update_tstamp(stream, &tstamp);
527 if (ret == 0)
528 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
529 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
530 return ret;
b21c60a4
VK		 531}
532
533static int snd_compr_pause(struct snd_compr_stream *stream)
534{
535 int retval;
536
537 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
538 return -EPERM;
539 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 540 if (!retval)
b21c60a4 541 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 542 return retval;
543}
544
545static int snd_compr_resume(struct snd_compr_stream *stream)
546{
547 int retval;
548
549 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
550 return -EPERM;
551 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
552 if (!retval)
553 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
554 return retval;
555}
556
557static int snd_compr_start(struct snd_compr_stream *stream)
558{
559 int retval;
560
561 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
562 return -EPERM;
563 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
564 if (!retval)
565 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
566 return retval;
567}
568
569static int snd_compr_stop(struct snd_compr_stream *stream)
570{
571 int retval;
572
573 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
574 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
575 return -EPERM;
576 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
577 if (!retval) {
578 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
579 wake_up(&stream->runtime->sleep);
8b21460a
VK		 580 stream->runtime->hw_pointer = 0;
581 stream->runtime->app_pointer = 0;
582 stream->runtime->total_bytes_available = 0;
583 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 584 }
585 return retval;
586}
587
588static int snd_compr_drain(struct snd_compr_stream *stream)
589{
590 int retval;
591
592 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
593 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
594 return -EPERM;
595 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
596 if (!retval) {
597 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
598 wake_up(&stream->runtime->sleep);
599 }
600 return retval;
601}
602
603static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
604{
605 struct snd_compr_file *data = f->private_data;
606 struct snd_compr_stream *stream;
607 int retval = -ENOTTY;
608
609 if (snd_BUG_ON(!data))
610 return -EFAULT;
611 stream = &data->stream;
612 if (snd_BUG_ON(!stream))
613 return -EFAULT;
614 mutex_lock(&stream->device->lock);
615 switch (_IOC_NR(cmd)) {
616 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
617 put_user(SNDRV_COMPRESS_VERSION,
618 (int __user *)arg) ? -EFAULT : 0;
619 break;
620 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
621 retval = snd_compr_get_caps(stream, arg);
622 break;
623 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
624 retval = snd_compr_get_codec_caps(stream, arg);
625 break;
626 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
627 retval = snd_compr_set_params(stream, arg);
628 break;
629 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
630 retval = snd_compr_get_params(stream, arg);
631 break;
632 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
633 retval = snd_compr_tstamp(stream, arg);
634 break;
635 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
636 retval = snd_compr_ioctl_avail(stream, arg);
637 break;
638 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
639 retval = snd_compr_pause(stream);
640 break;
641 case _IOC_NR(SNDRV_COMPRESS_RESUME):
642 retval = snd_compr_resume(stream);
643 break;
644 case _IOC_NR(SNDRV_COMPRESS_START):
645 retval = snd_compr_start(stream);
646 break;
647 case _IOC_NR(SNDRV_COMPRESS_STOP):
648 retval = snd_compr_stop(stream);
649 break;
650 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
651 retval = snd_compr_drain(stream);
652 break;
653 }
654 mutex_unlock(&stream->device->lock);
655 return retval;
656}
657
658static const struct file_operations snd_compr_file_ops = {
659 .owner = THIS_MODULE,
660 .open = snd_compr_open,
661 .release = snd_compr_free,
662 .write = snd_compr_write,
663 .read = snd_compr_read,
664 .unlocked_ioctl = snd_compr_ioctl,
665 .mmap = snd_compr_mmap,
666 .poll = snd_compr_poll,
667};
668
669static int snd_compress_dev_register(struct snd_device *device)
670{
671 int ret = -EINVAL;
672 char str[16];
673 struct snd_compr *compr;
674
675 if (snd_BUG_ON(!device || !device->device_data))
676 return -EBADFD;
677 compr = device->device_data;
678
679 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
680 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
681 compr->direction);
682 /* register compressed device */
683 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
684 compr->device, &snd_compr_file_ops, compr, str);
685 if (ret < 0) {
686 pr_err("snd_register_device failed\n %d", ret);
687 return ret;
688 }
689 return ret;
690
691}
692
693static int snd_compress_dev_disconnect(struct snd_device *device)
694{
695 struct snd_compr *compr;
696
697 compr = device->device_data;
698 snd_unregister_device(compr->direction, compr->card, compr->device);
699 return 0;
700}
701
702/*
703 * snd_compress_new: create new compress device
704 * @card: sound card pointer
705 * @device: device number
706 * @dirn: device direction, should be of type enum snd_compr_direction
707 * @compr: compress device pointer
708 */
709int snd_compress_new(struct snd_card *card, int device,
710 int dirn, struct snd_compr *compr)
711{
712 static struct snd_device_ops ops = {
713 .dev_free = NULL,
714 .dev_register = snd_compress_dev_register,
715 .dev_disconnect = snd_compress_dev_disconnect,
716 };
717
718 compr->card = card;
719 compr->device = device;
720 compr->direction = dirn;
721 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
722}
723EXPORT_SYMBOL_GPL(snd_compress_new);
724
725static int snd_compress_add_device(struct snd_compr *device)
726{
727 int ret;
728
729 if (!device->card)
730 return -EINVAL;
731
732 /* register the card */
733 ret = snd_card_register(device->card);
734 if (ret)
735 goto out;
736 return 0;
737
738out:
739 pr_err("failed with %d\n", ret);
740 return ret;
741
742}
743
744static int snd_compress_remove_device(struct snd_compr *device)
745{
746 return snd_card_free(device->card);
747}
748
749/**
750 * snd_compress_register - register compressed device
751 *
752 * @device: compressed device to register
753 */
754int snd_compress_register(struct snd_compr *device)
755{
756 int retval;
757
758 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
759 return -EINVAL;
760
761 pr_debug("Registering compressed device %s\n", device->name);
762 if (snd_BUG_ON(!device->ops->open))
763 return -EINVAL;
764 if (snd_BUG_ON(!device->ops->free))
765 return -EINVAL;
766 if (snd_BUG_ON(!device->ops->set_params))
767 return -EINVAL;
768 if (snd_BUG_ON(!device->ops->trigger))
769 return -EINVAL;
770
771 mutex_init(&device->lock);
772
773 /* register a compressed card */
774 mutex_lock(&device_mutex);
775 retval = snd_compress_add_device(device);
776 mutex_unlock(&device_mutex);
777 return retval;
778}
779EXPORT_SYMBOL_GPL(snd_compress_register);
780
781int snd_compress_deregister(struct snd_compr *device)
782{
783 pr_debug("Removing compressed device %s\n", device->name);
784 mutex_lock(&device_mutex);
785 snd_compress_remove_device(device);
786 mutex_unlock(&device_mutex);
787 return 0;
788}
789EXPORT_SYMBOL_GPL(snd_compress_deregister);
790
791static int __init snd_compress_init(void)
792{
793 return 0;
794}
795
796static void __exit snd_compress_exit(void)
797{
798}
799
800module_init(snd_compress_init);
801module_exit(snd_compress_exit);
802
803MODULE_DESCRIPTION("ALSA Compressed offload framework");
804MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
805MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)