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ALSA: ymfpci - Don't create invalid PCM & mixers when AC97 doesn't support
[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
83 if (f->f_flags & O_WRONLY)
84 dirn = SND_COMPRESS_PLAYBACK;
85 else if (f->f_flags & O_RDONLY)
86 dirn = SND_COMPRESS_CAPTURE;
87 else {
88 pr_err("invalid direction\n");
89 return -EINVAL;
90 }
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 return -EINVAL;
106 }
107
108 data = kzalloc(sizeof(*data), GFP_KERNEL);
109 if (!data)
110 return -ENOMEM;
111 data->stream.ops = compr->ops;
112 data->stream.direction = dirn;
113 data->stream.private_data = compr->private_data;
114 data->stream.device = compr;
115 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
116 if (!runtime) {
117 kfree(data);
118 return -ENOMEM;
119 }
120 runtime->state = SNDRV_PCM_STATE_OPEN;
121 init_waitqueue_head(&runtime->sleep);
122 data->stream.runtime = runtime;
123 f->private_data = (void *)data;
124 mutex_lock(&compr->lock);
125 ret = compr->ops->open(&data->stream);
126 mutex_unlock(&compr->lock);
127 if (ret) {
128 kfree(runtime);
129 kfree(data);
130 }
131 return ret;
132}
133
134static int snd_compr_free(struct inode *inode, struct file *f)
135{
136 struct snd_compr_file *data = f->private_data;
137 data->stream.ops->free(&data->stream);
138 kfree(data->stream.runtime->buffer);
139 kfree(data->stream.runtime);
140 kfree(data);
141 return 0;
142}
143
144static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
145 struct snd_compr_tstamp *tstamp)
146{
147 if (!stream->ops->pointer)
148 return;
149 stream->ops->pointer(stream, tstamp);
150 pr_debug("dsp consumed till %d total %d bytes\n",
151 tstamp->byte_offset, tstamp->copied_total);
152 stream->runtime->hw_pointer = tstamp->byte_offset;
153 stream->runtime->total_bytes_transferred = tstamp->copied_total;
154}
155
156static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
157 struct snd_compr_avail *avail)
158{
159 long avail_calc; /*this needs to be signed variable */
160
161 snd_compr_update_tstamp(stream, &avail->tstamp);
162
163 /* FIXME: This needs to be different for capture stream,
164 available is # of compressed data, for playback it's
165 remainder of buffer */
166
167 if (stream->runtime->total_bytes_available == 0 &&
168 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
169 pr_debug("detected init and someone forgot to do a write\n");
170 return stream->runtime->buffer_size;
171 }
172 pr_debug("app wrote %lld, DSP consumed %lld\n",
173 stream->runtime->total_bytes_available,
174 stream->runtime->total_bytes_transferred);
175 if (stream->runtime->total_bytes_available ==
176 stream->runtime->total_bytes_transferred) {
177 pr_debug("both pointers are same, returning full avail\n");
178 return stream->runtime->buffer_size;
179 }
180
181 /* FIXME: this routine isn't consistent, in one test we use
182 * cumulative values and in the other byte offsets. Do we
183 * really need the byte offsets if the cumulative values have
184 * been updated? In the PCM interface app_ptr and hw_ptr are
185 * already cumulative */
186
187 avail_calc = stream->runtime->buffer_size -
188 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
189 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
190 stream->runtime->app_pointer,
191 stream->runtime->hw_pointer);
192 if (avail_calc >= stream->runtime->buffer_size)
193 avail_calc -= stream->runtime->buffer_size;
194 pr_debug("ret avail as %ld\n", avail_calc);
195 avail->avail = avail_calc;
196 return avail_calc;
197}
198
199static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
200{
201 struct snd_compr_avail avail;
202
203 return snd_compr_calc_avail(stream, &avail);
204}
205
206static int
207snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
208{
209 struct snd_compr_avail ioctl_avail;
210 size_t avail;
211
212 avail = snd_compr_calc_avail(stream, &ioctl_avail);
213 ioctl_avail.avail = avail;
214
215 if (copy_to_user((__u64 __user *)arg,
216 &ioctl_avail, sizeof(ioctl_avail)))
217 return -EFAULT;
218 return 0;
219}
220
221static int snd_compr_write_data(struct snd_compr_stream *stream,
222 const char __user *buf, size_t count)
223{
224 void *dstn;
225 size_t copy;
226 struct snd_compr_runtime *runtime = stream->runtime;
227
228 dstn = runtime->buffer + runtime->app_pointer;
229 pr_debug("copying %ld at %lld\n",
230 (unsigned long)count, runtime->app_pointer);
231 if (count < runtime->buffer_size - runtime->app_pointer) {
232 if (copy_from_user(dstn, buf, count))
233 return -EFAULT;
234 runtime->app_pointer += count;
235 } else {
236 copy = runtime->buffer_size - runtime->app_pointer;
237 if (copy_from_user(dstn, buf, copy))
238 return -EFAULT;
239 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
240 return -EFAULT;
241 runtime->app_pointer = count - copy;
242 }
243 /* if DSP cares, let it know data has been written */
244 if (stream->ops->ack)
245 stream->ops->ack(stream, count);
246 return count;
247}
248
249static ssize_t snd_compr_write(struct file *f, const char __user *buf,
250 size_t count, loff_t *offset)
251{
252 struct snd_compr_file *data = f->private_data;
253 struct snd_compr_stream *stream;
254 size_t avail;
255 int retval;
256
257 if (snd_BUG_ON(!data))
258 return -EFAULT;
259
260 stream = &data->stream;
261 mutex_lock(&stream->device->lock);
262 /* write is allowed when stream is running or has been steup */
263 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
264 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
265 mutex_unlock(&stream->device->lock);
266 return -EBADFD;
267 }
268
269 avail = snd_compr_get_avail(stream);
270 pr_debug("avail returned %ld\n", (unsigned long)avail);
271 /* calculate how much we can write to buffer */
272 if (avail > count)
273 avail = count;
274
275 if (stream->ops->copy)
276 retval = stream->ops->copy(stream, buf, avail);
277 else
278 retval = snd_compr_write_data(stream, buf, avail);
279 if (retval > 0)
280 stream->runtime->total_bytes_available += retval;
281
282 /* while initiating the stream, write should be called before START
283 * call, so in setup move state */
284 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
285 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
286 pr_debug("stream prepared, Houston we are good to go\n");
287 }
288
289 mutex_unlock(&stream->device->lock);
290 return retval;
291}
292
293
294static ssize_t snd_compr_read(struct file *f, char __user *buf,
295 size_t count, loff_t *offset)
296{
297 return -ENXIO;
298}
299
300static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
301{
302 return -ENXIO;
303}
304
305static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
306{
307 if (stream->direction == SND_COMPRESS_PLAYBACK)
308 return POLLOUT | POLLWRNORM;
309 else
310 return POLLIN | POLLRDNORM;
311}
312
313static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
314{
315 struct snd_compr_file *data = f->private_data;
316 struct snd_compr_stream *stream;
317 size_t avail;
318 int retval = 0;
319
320 if (snd_BUG_ON(!data))
321 return -EFAULT;
322 stream = &data->stream;
323 if (snd_BUG_ON(!stream))
324 return -EFAULT;
325
326 mutex_lock(&stream->device->lock);
327 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
328 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
329 retval = -EBADFD;
330 goto out;
331 }
332 poll_wait(f, &stream->runtime->sleep, wait);
333
334 avail = snd_compr_get_avail(stream);
335 pr_debug("avail is %ld\n", (unsigned long)avail);
336 /* check if we have at least one fragment to fill */
337 switch (stream->runtime->state) {
338 case SNDRV_PCM_STATE_DRAINING:
339 /* stream has been woken up after drain is complete
340 * draining done so set stream state to stopped
341 */
342 retval = snd_compr_get_poll(stream);
343 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
344 break;
345 case SNDRV_PCM_STATE_RUNNING:
346 case SNDRV_PCM_STATE_PREPARED:
347 case SNDRV_PCM_STATE_PAUSED:
348 if (avail >= stream->runtime->fragment_size)
349 retval = snd_compr_get_poll(stream);
350 break;
351 default:
352 if (stream->direction == SND_COMPRESS_PLAYBACK)
353 retval = POLLOUT | POLLWRNORM | POLLERR;
354 else
355 retval = POLLIN | POLLRDNORM | POLLERR;
356 break;
357 }
358out:
359 mutex_unlock(&stream->device->lock);
360 return retval;
361}
362
363static int
364snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
365{
366 int retval;
367 struct snd_compr_caps caps;
368
369 if (!stream->ops->get_caps)
370 return -ENXIO;
371
372 retval = stream->ops->get_caps(stream, &caps);
373 if (retval)
374 goto out;
375 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
376 retval = -EFAULT;
377out:
378 return retval;
379}
380
381static int
382snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
383{
384 int retval;
385 struct snd_compr_codec_caps *caps;
386
387 if (!stream->ops->get_codec_caps)
388 return -ENXIO;
389
390 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
391 if (!caps)
392 return -ENOMEM;
393
394 retval = stream->ops->get_codec_caps(stream, caps);
395 if (retval)
396 goto out;
397 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
398 retval = -EFAULT;
399
400out:
401 kfree(caps);
402 return retval;
403}
404
405/* revisit this with snd_pcm_preallocate_xxx */
406static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
407 struct snd_compr_params *params)
408{
409 unsigned int buffer_size;
410 void *buffer;
411
412 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
413 if (stream->ops->copy) {
414 buffer = NULL;
415 /* if copy is defined the driver will be required to copy
416 * the data from core
417 */
418 } else {
419 buffer = kmalloc(buffer_size, GFP_KERNEL);
420 if (!buffer)
421 return -ENOMEM;
422 }
423 stream->runtime->fragment_size = params->buffer.fragment_size;
424 stream->runtime->fragments = params->buffer.fragments;
425 stream->runtime->buffer = buffer;
426 stream->runtime->buffer_size = buffer_size;
427 return 0;
428}
429
430static int
431snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
432{
433 struct snd_compr_params *params;
434 int retval;
435
436 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
437 /*
438 * we should allow parameter change only when stream has been
439 * opened not in other cases
440 */
441 params = kmalloc(sizeof(*params), GFP_KERNEL);
442 if (!params)
443 return -ENOMEM;
444 if (copy_from_user(params, (void __user *)arg, sizeof(*params)))
445 return -EFAULT;
446 retval = snd_compr_allocate_buffer(stream, params);
447 if (retval) {
448 kfree(params);
449 return -ENOMEM;
450 }
451 retval = stream->ops->set_params(stream, params);
452 if (retval)
453 goto out;
454 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
455 } else
456 return -EPERM;
457out:
458 kfree(params);
459 return retval;
460}
461
462static int
463snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
464{
465 struct snd_codec *params;
466 int retval;
467
468 if (!stream->ops->get_params)
469 return -EBADFD;
470
471 params = kmalloc(sizeof(*params), GFP_KERNEL);
472 if (!params)
473 return -ENOMEM;
474 retval = stream->ops->get_params(stream, params);
475 if (retval)
476 goto out;
477 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
478 retval = -EFAULT;
479
480out:
481 kfree(params);
482 return retval;
483}
484
485static inline int
486snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
487{
488 struct snd_compr_tstamp tstamp;
489
490 snd_compr_update_tstamp(stream, &tstamp);
491 return copy_to_user((struct snd_compr_tstamp __user *)arg,
492 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
493}
494
495static int snd_compr_pause(struct snd_compr_stream *stream)
496{
497 int retval;
498
499 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
500 return -EPERM;
501 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
502 if (!retval) {
503 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
504 wake_up(&stream->runtime->sleep);
505 }
506 return retval;
507}
508
509static int snd_compr_resume(struct snd_compr_stream *stream)
510{
511 int retval;
512
513 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
514 return -EPERM;
515 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
516 if (!retval)
517 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
518 return retval;
519}
520
521static int snd_compr_start(struct snd_compr_stream *stream)
522{
523 int retval;
524
525 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
526 return -EPERM;
527 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
528 if (!retval)
529 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
530 return retval;
531}
532
533static int snd_compr_stop(struct snd_compr_stream *stream)
534{
535 int retval;
536
537 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
538 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
539 return -EPERM;
540 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
541 if (!retval) {
542 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
543 wake_up(&stream->runtime->sleep);
544 }
545 return retval;
546}
547
548static int snd_compr_drain(struct snd_compr_stream *stream)
549{
550 int retval;
551
552 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
553 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
554 return -EPERM;
555 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
556 if (!retval) {
557 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
558 wake_up(&stream->runtime->sleep);
559 }
560 return retval;
561}
562
563static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
564{
565 struct snd_compr_file *data = f->private_data;
566 struct snd_compr_stream *stream;
567 int retval = -ENOTTY;
568
569 if (snd_BUG_ON(!data))
570 return -EFAULT;
571 stream = &data->stream;
572 if (snd_BUG_ON(!stream))
573 return -EFAULT;
574 mutex_lock(&stream->device->lock);
575 switch (_IOC_NR(cmd)) {
576 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
577 put_user(SNDRV_COMPRESS_VERSION,
578 (int __user *)arg) ? -EFAULT : 0;
579 break;
580 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
581 retval = snd_compr_get_caps(stream, arg);
582 break;
583 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
584 retval = snd_compr_get_codec_caps(stream, arg);
585 break;
586 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
587 retval = snd_compr_set_params(stream, arg);
588 break;
589 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
590 retval = snd_compr_get_params(stream, arg);
591 break;
592 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
593 retval = snd_compr_tstamp(stream, arg);
594 break;
595 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
596 retval = snd_compr_ioctl_avail(stream, arg);
597 break;
598 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
599 retval = snd_compr_pause(stream);
600 break;
601 case _IOC_NR(SNDRV_COMPRESS_RESUME):
602 retval = snd_compr_resume(stream);
603 break;
604 case _IOC_NR(SNDRV_COMPRESS_START):
605 retval = snd_compr_start(stream);
606 break;
607 case _IOC_NR(SNDRV_COMPRESS_STOP):
608 retval = snd_compr_stop(stream);
609 break;
610 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
611 retval = snd_compr_drain(stream);
612 break;
613 }
614 mutex_unlock(&stream->device->lock);
615 return retval;
616}
617
618static const struct file_operations snd_compr_file_ops = {
619 .owner = THIS_MODULE,
620 .open = snd_compr_open,
621 .release = snd_compr_free,
622 .write = snd_compr_write,
623 .read = snd_compr_read,
624 .unlocked_ioctl = snd_compr_ioctl,
625 .mmap = snd_compr_mmap,
626 .poll = snd_compr_poll,
627};
628
629static int snd_compress_dev_register(struct snd_device *device)
630{
631 int ret = -EINVAL;
632 char str[16];
633 struct snd_compr *compr;
634
635 if (snd_BUG_ON(!device || !device->device_data))
636 return -EBADFD;
637 compr = device->device_data;
638
639 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
640 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
641 compr->direction);
642 /* register compressed device */
643 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
644 compr->device, &snd_compr_file_ops, compr, str);
645 if (ret < 0) {
646 pr_err("snd_register_device failed\n %d", ret);
647 return ret;
648 }
649 return ret;
650
651}
652
653static int snd_compress_dev_disconnect(struct snd_device *device)
654{
655 struct snd_compr *compr;
656
657 compr = device->device_data;
658 snd_unregister_device(compr->direction, compr->card, compr->device);
659 return 0;
660}
661
662/*
663 * snd_compress_new: create new compress device
664 * @card: sound card pointer
665 * @device: device number
666 * @dirn: device direction, should be of type enum snd_compr_direction
667 * @compr: compress device pointer
668 */
669int snd_compress_new(struct snd_card *card, int device,
670 int dirn, struct snd_compr *compr)
671{
672 static struct snd_device_ops ops = {
673 .dev_free = NULL,
674 .dev_register = snd_compress_dev_register,
675 .dev_disconnect = snd_compress_dev_disconnect,
676 };
677
678 compr->card = card;
679 compr->device = device;
680 compr->direction = dirn;
681 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
682}
683EXPORT_SYMBOL_GPL(snd_compress_new);
684
685static int snd_compress_add_device(struct snd_compr *device)
686{
687 int ret;
688
689 if (!device->card)
690 return -EINVAL;
691
692 /* register the card */
693 ret = snd_card_register(device->card);
694 if (ret)
695 goto out;
696 return 0;
697
698out:
699 pr_err("failed with %d\n", ret);
700 return ret;
701
702}
703
704static int snd_compress_remove_device(struct snd_compr *device)
705{
706 return snd_card_free(device->card);
707}
708
709/**
710 * snd_compress_register - register compressed device
711 *
712 * @device: compressed device to register
713 */
714int snd_compress_register(struct snd_compr *device)
715{
716 int retval;
717
718 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
719 return -EINVAL;
720
721 pr_debug("Registering compressed device %s\n", device->name);
722 if (snd_BUG_ON(!device->ops->open))
723 return -EINVAL;
724 if (snd_BUG_ON(!device->ops->free))
725 return -EINVAL;
726 if (snd_BUG_ON(!device->ops->set_params))
727 return -EINVAL;
728 if (snd_BUG_ON(!device->ops->trigger))
729 return -EINVAL;
730
731 mutex_init(&device->lock);
732
733 /* register a compressed card */
734 mutex_lock(&device_mutex);
735 retval = snd_compress_add_device(device);
736 mutex_unlock(&device_mutex);
737 return retval;
738}
739EXPORT_SYMBOL_GPL(snd_compress_register);
740
741int snd_compress_deregister(struct snd_compr *device)
742{
743 pr_debug("Removing compressed device %s\n", device->name);
744 mutex_lock(&device_mutex);
745 snd_compress_remove_device(device);
746 mutex_unlock(&device_mutex);
747 return 0;
748}
749EXPORT_SYMBOL_GPL(snd_compress_deregister);
750
751static int __init snd_compress_init(void)
752{
753 return 0;
754}
755
756static void __exit snd_compress_exit(void)
757{
758}
759
760module_init(snd_compress_init);
761module_exit(snd_compress_exit);
762
763MODULE_DESCRIPTION("ALSA Compressed offload framework");
764MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
765MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)