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ALSA: compress - move the buffer check
[GitHub/mt8127/android_kernel_alcatel_ttab.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");
103 return -EINVAL;
104 }
105
106 data = kzalloc(sizeof(*data), GFP_KERNEL);
107 if (!data)
108 return -ENOMEM;
109 data->stream.ops = compr->ops;
110 data->stream.direction = dirn;
111 data->stream.private_data = compr->private_data;
112 data->stream.device = compr;
113 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
114 if (!runtime) {
115 kfree(data);
116 return -ENOMEM;
117 }
118 runtime->state = SNDRV_PCM_STATE_OPEN;
119 init_waitqueue_head(&runtime->sleep);
120 data->stream.runtime = runtime;
121 f->private_data = (void *)data;
122 mutex_lock(&compr->lock);
123 ret = compr->ops->open(&data->stream);
124 mutex_unlock(&compr->lock);
125 if (ret) {
126 kfree(runtime);
127 kfree(data);
128 }
129 return ret;
130}
131
132static int snd_compr_free(struct inode *inode, struct file *f)
133{
134 struct snd_compr_file *data = f->private_data;
135 data->stream.ops->free(&data->stream);
136 kfree(data->stream.runtime->buffer);
137 kfree(data->stream.runtime);
138 kfree(data);
139 return 0;
140}
141
142static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
143 struct snd_compr_tstamp *tstamp)
144{
145 if (!stream->ops->pointer)
146 return;
147 stream->ops->pointer(stream, tstamp);
148 pr_debug("dsp consumed till %d total %d bytes\n",
149 tstamp->byte_offset, tstamp->copied_total);
150 stream->runtime->hw_pointer = tstamp->byte_offset;
151 stream->runtime->total_bytes_transferred = tstamp->copied_total;
152}
153
154static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
155 struct snd_compr_avail *avail)
156{
157 long avail_calc; /*this needs to be signed variable */
158
159 snd_compr_update_tstamp(stream, &avail->tstamp);
160
161 /* FIXME: This needs to be different for capture stream,
162 available is # of compressed data, for playback it's
163 remainder of buffer */
164
165 if (stream->runtime->total_bytes_available == 0 &&
166 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
167 pr_debug("detected init and someone forgot to do a write\n");
168 return stream->runtime->buffer_size;
169 }
170 pr_debug("app wrote %lld, DSP consumed %lld\n",
171 stream->runtime->total_bytes_available,
172 stream->runtime->total_bytes_transferred);
173 if (stream->runtime->total_bytes_available ==
174 stream->runtime->total_bytes_transferred) {
175 pr_debug("both pointers are same, returning full avail\n");
176 return stream->runtime->buffer_size;
177 }
178
179 /* FIXME: this routine isn't consistent, in one test we use
180 * cumulative values and in the other byte offsets. Do we
181 * really need the byte offsets if the cumulative values have
182 * been updated? In the PCM interface app_ptr and hw_ptr are
183 * already cumulative */
184
185 avail_calc = stream->runtime->buffer_size -
186 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
187 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
188 stream->runtime->app_pointer,
189 stream->runtime->hw_pointer);
190 if (avail_calc >= stream->runtime->buffer_size)
191 avail_calc -= stream->runtime->buffer_size;
192 pr_debug("ret avail as %ld\n", avail_calc);
193 avail->avail = avail_calc;
194 return avail_calc;
195}
196
197static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
198{
199 struct snd_compr_avail avail;
200
201 return snd_compr_calc_avail(stream, &avail);
202}
203
204static int
205snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
206{
207 struct snd_compr_avail ioctl_avail;
208 size_t avail;
209
210 avail = snd_compr_calc_avail(stream, &ioctl_avail);
211 ioctl_avail.avail = avail;
212
213 if (copy_to_user((__u64 __user *)arg,
214 &ioctl_avail, sizeof(ioctl_avail)))
215 return -EFAULT;
216 return 0;
217}
218
219static int snd_compr_write_data(struct snd_compr_stream *stream,
220 const char __user *buf, size_t count)
221{
222 void *dstn;
223 size_t copy;
224 struct snd_compr_runtime *runtime = stream->runtime;
225
226 dstn = runtime->buffer + runtime->app_pointer;
227 pr_debug("copying %ld at %lld\n",
228 (unsigned long)count, runtime->app_pointer);
229 if (count < runtime->buffer_size - runtime->app_pointer) {
230 if (copy_from_user(dstn, buf, count))
231 return -EFAULT;
232 runtime->app_pointer += count;
233 } else {
234 copy = runtime->buffer_size - runtime->app_pointer;
235 if (copy_from_user(dstn, buf, copy))
236 return -EFAULT;
237 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
238 return -EFAULT;
239 runtime->app_pointer = count - copy;
240 }
241 /* if DSP cares, let it know data has been written */
242 if (stream->ops->ack)
243 stream->ops->ack(stream, count);
244 return count;
245}
246
247static ssize_t snd_compr_write(struct file *f, const char __user *buf,
248 size_t count, loff_t *offset)
249{
250 struct snd_compr_file *data = f->private_data;
251 struct snd_compr_stream *stream;
252 size_t avail;
253 int retval;
254
255 if (snd_BUG_ON(!data))
256 return -EFAULT;
257
258 stream = &data->stream;
259 mutex_lock(&stream->device->lock);
260 /* write is allowed when stream is running or has been steup */
261 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
262 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
263 mutex_unlock(&stream->device->lock);
264 return -EBADFD;
265 }
266
267 avail = snd_compr_get_avail(stream);
268 pr_debug("avail returned %ld\n", (unsigned long)avail);
269 /* calculate how much we can write to buffer */
270 if (avail > count)
271 avail = count;
272
273 if (stream->ops->copy)
274 retval = stream->ops->copy(stream, buf, avail);
275 else
276 retval = snd_compr_write_data(stream, buf, avail);
277 if (retval > 0)
278 stream->runtime->total_bytes_available += retval;
279
280 /* while initiating the stream, write should be called before START
281 * call, so in setup move state */
282 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
283 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
284 pr_debug("stream prepared, Houston we are good to go\n");
285 }
286
287 mutex_unlock(&stream->device->lock);
288 return retval;
289}
290
291
292static ssize_t snd_compr_read(struct file *f, char __user *buf,
293 size_t count, loff_t *offset)
294{
295 return -ENXIO;
296}
297
298static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
299{
300 return -ENXIO;
301}
302
303static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
304{
305 if (stream->direction == SND_COMPRESS_PLAYBACK)
306 return POLLOUT | POLLWRNORM;
307 else
308 return POLLIN | POLLRDNORM;
309}
310
311static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
312{
313 struct snd_compr_file *data = f->private_data;
314 struct snd_compr_stream *stream;
315 size_t avail;
316 int retval = 0;
317
318 if (snd_BUG_ON(!data))
319 return -EFAULT;
320 stream = &data->stream;
321 if (snd_BUG_ON(!stream))
322 return -EFAULT;
323
324 mutex_lock(&stream->device->lock);
325 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
326 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
327 retval = -EBADFD;
328 goto out;
329 }
330 poll_wait(f, &stream->runtime->sleep, wait);
331
332 avail = snd_compr_get_avail(stream);
333 pr_debug("avail is %ld\n", (unsigned long)avail);
334 /* check if we have at least one fragment to fill */
335 switch (stream->runtime->state) {
336 case SNDRV_PCM_STATE_DRAINING:
337 /* stream has been woken up after drain is complete
338 * draining done so set stream state to stopped
339 */
340 retval = snd_compr_get_poll(stream);
341 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
342 break;
343 case SNDRV_PCM_STATE_RUNNING:
344 case SNDRV_PCM_STATE_PREPARED:
345 case SNDRV_PCM_STATE_PAUSED:
346 if (avail >= stream->runtime->fragment_size)
347 retval = snd_compr_get_poll(stream);
348 break;
349 default:
350 if (stream->direction == SND_COMPRESS_PLAYBACK)
351 retval = POLLOUT | POLLWRNORM | POLLERR;
352 else
353 retval = POLLIN | POLLRDNORM | POLLERR;
354 break;
355 }
356out:
357 mutex_unlock(&stream->device->lock);
358 return retval;
359}
360
361static int
362snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
363{
364 int retval;
365 struct snd_compr_caps caps;
366
367 if (!stream->ops->get_caps)
368 return -ENXIO;
369
370 retval = stream->ops->get_caps(stream, &caps);
371 if (retval)
372 goto out;
373 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
374 retval = -EFAULT;
375out:
376 return retval;
377}
378
379static int
380snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
381{
382 int retval;
383 struct snd_compr_codec_caps *caps;
384
385 if (!stream->ops->get_codec_caps)
386 return -ENXIO;
387
388 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
389 if (!caps)
390 return -ENOMEM;
391
392 retval = stream->ops->get_codec_caps(stream, caps);
393 if (retval)
394 goto out;
395 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
396 retval = -EFAULT;
397
398out:
399 kfree(caps);
400 return retval;
401}
402
403/* revisit this with snd_pcm_preallocate_xxx */
404static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
405 struct snd_compr_params *params)
406{
407 unsigned int buffer_size;
408 void *buffer;
409
410 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
411 if (stream->ops->copy) {
412 buffer = NULL;
413 /* if copy is defined the driver will be required to copy
414 * the data from core
415 */
416 } else {
417 buffer = kmalloc(buffer_size, GFP_KERNEL);
418 if (!buffer)
419 return -ENOMEM;
420 }
421 stream->runtime->fragment_size = params->buffer.fragment_size;
422 stream->runtime->fragments = params->buffer.fragments;
423 stream->runtime->buffer = buffer;
424 stream->runtime->buffer_size = buffer_size;
425 return 0;
426}
427
4dc040a0
VK		 428static int snd_compress_check_input(struct snd_compr_params *params)
429{
430 /* first let's check the buffer parameter's */
431 if (params->buffer.fragment_size == 0 ||
432 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
433 return -EINVAL;
434
435 return 0;
436}
437
b21c60a4
VK		 438static int
439snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
440{
441 struct snd_compr_params *params;
442 int retval;
443
444 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
445 /*
446 * we should allow parameter change only when stream has been
447 * opened not in other cases
448 */
449 params = kmalloc(sizeof(*params), GFP_KERNEL);
450 if (!params)
451 return -ENOMEM;
769fab2a
JJ		 452 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
453 retval = -EFAULT;
454 goto out;
455 }
4dc040a0
VK		 456
457 retval = snd_compress_check_input(params);
458 if (retval)
459 goto out;
460
b21c60a4
VK		 461 retval = snd_compr_allocate_buffer(stream, params);
462 if (retval) {
769fab2a
JJ		 463 retval = -ENOMEM;
464 goto out;
b21c60a4 465 }
4dc040a0 466
b21c60a4
VK		 467 retval = stream->ops->set_params(stream, params);
468 if (retval)
469 goto out;
470 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
769fab2a 471 } else {
b21c60a4 472 return -EPERM;
769fab2a 473 }
b21c60a4
VK		 474out:
475 kfree(params);
476 return retval;
477}
478
479static int
480snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
481{
482 struct snd_codec *params;
483 int retval;
484
485 if (!stream->ops->get_params)
486 return -EBADFD;
487
488 params = kmalloc(sizeof(*params), GFP_KERNEL);
489 if (!params)
490 return -ENOMEM;
491 retval = stream->ops->get_params(stream, params);
492 if (retval)
493 goto out;
494 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
495 retval = -EFAULT;
496
497out:
498 kfree(params);
499 return retval;
500}
501
502static inline int
503snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
504{
505 struct snd_compr_tstamp tstamp;
506
507 snd_compr_update_tstamp(stream, &tstamp);
508 return copy_to_user((struct snd_compr_tstamp __user *)arg,
509 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
510}
511
512static int snd_compr_pause(struct snd_compr_stream *stream)
513{
514 int retval;
515
516 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
517 return -EPERM;
518 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 519 if (!retval)
b21c60a4 520 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 521 return retval;
522}
523
524static int snd_compr_resume(struct snd_compr_stream *stream)
525{
526 int retval;
527
528 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
529 return -EPERM;
530 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
531 if (!retval)
532 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
533 return retval;
534}
535
536static int snd_compr_start(struct snd_compr_stream *stream)
537{
538 int retval;
539
540 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
541 return -EPERM;
542 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
543 if (!retval)
544 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
545 return retval;
546}
547
548static int snd_compr_stop(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, SNDRV_PCM_TRIGGER_STOP);
556 if (!retval) {
557 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
558 wake_up(&stream->runtime->sleep);
8b21460a
VK		 559 stream->runtime->hw_pointer = 0;
560 stream->runtime->app_pointer = 0;
561 stream->runtime->total_bytes_available = 0;
562 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 563 }
564 return retval;
565}
566
567static int snd_compr_drain(struct snd_compr_stream *stream)
568{
569 int retval;
570
571 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
572 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
573 return -EPERM;
574 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
575 if (!retval) {
576 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
577 wake_up(&stream->runtime->sleep);
578 }
579 return retval;
580}
581
582static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
583{
584 struct snd_compr_file *data = f->private_data;
585 struct snd_compr_stream *stream;
586 int retval = -ENOTTY;
587
588 if (snd_BUG_ON(!data))
589 return -EFAULT;
590 stream = &data->stream;
591 if (snd_BUG_ON(!stream))
592 return -EFAULT;
593 mutex_lock(&stream->device->lock);
594 switch (_IOC_NR(cmd)) {
595 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
596 put_user(SNDRV_COMPRESS_VERSION,
597 (int __user *)arg) ? -EFAULT : 0;
598 break;
599 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
600 retval = snd_compr_get_caps(stream, arg);
601 break;
602 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
603 retval = snd_compr_get_codec_caps(stream, arg);
604 break;
605 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
606 retval = snd_compr_set_params(stream, arg);
607 break;
608 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
609 retval = snd_compr_get_params(stream, arg);
610 break;
611 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
612 retval = snd_compr_tstamp(stream, arg);
613 break;
614 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
615 retval = snd_compr_ioctl_avail(stream, arg);
616 break;
617 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
618 retval = snd_compr_pause(stream);
619 break;
620 case _IOC_NR(SNDRV_COMPRESS_RESUME):
621 retval = snd_compr_resume(stream);
622 break;
623 case _IOC_NR(SNDRV_COMPRESS_START):
624 retval = snd_compr_start(stream);
625 break;
626 case _IOC_NR(SNDRV_COMPRESS_STOP):
627 retval = snd_compr_stop(stream);
628 break;
629 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
630 retval = snd_compr_drain(stream);
631 break;
632 }
633 mutex_unlock(&stream->device->lock);
634 return retval;
635}
636
637static const struct file_operations snd_compr_file_ops = {
638 .owner = THIS_MODULE,
639 .open = snd_compr_open,
640 .release = snd_compr_free,
641 .write = snd_compr_write,
642 .read = snd_compr_read,
643 .unlocked_ioctl = snd_compr_ioctl,
644 .mmap = snd_compr_mmap,
645 .poll = snd_compr_poll,
646};
647
648static int snd_compress_dev_register(struct snd_device *device)
649{
650 int ret = -EINVAL;
651 char str[16];
652 struct snd_compr *compr;
653
654 if (snd_BUG_ON(!device || !device->device_data))
655 return -EBADFD;
656 compr = device->device_data;
657
658 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
659 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
660 compr->direction);
661 /* register compressed device */
662 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
663 compr->device, &snd_compr_file_ops, compr, str);
664 if (ret < 0) {
665 pr_err("snd_register_device failed\n %d", ret);
666 return ret;
667 }
668 return ret;
669
670}
671
672static int snd_compress_dev_disconnect(struct snd_device *device)
673{
674 struct snd_compr *compr;
675
676 compr = device->device_data;
677 snd_unregister_device(compr->direction, compr->card, compr->device);
678 return 0;
679}
680
681/*
682 * snd_compress_new: create new compress device
683 * @card: sound card pointer
684 * @device: device number
685 * @dirn: device direction, should be of type enum snd_compr_direction
686 * @compr: compress device pointer
687 */
688int snd_compress_new(struct snd_card *card, int device,
689 int dirn, struct snd_compr *compr)
690{
691 static struct snd_device_ops ops = {
692 .dev_free = NULL,
693 .dev_register = snd_compress_dev_register,
694 .dev_disconnect = snd_compress_dev_disconnect,
695 };
696
697 compr->card = card;
698 compr->device = device;
699 compr->direction = dirn;
700 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
701}
702EXPORT_SYMBOL_GPL(snd_compress_new);
703
704static int snd_compress_add_device(struct snd_compr *device)
705{
706 int ret;
707
708 if (!device->card)
709 return -EINVAL;
710
711 /* register the card */
712 ret = snd_card_register(device->card);
713 if (ret)
714 goto out;
715 return 0;
716
717out:
718 pr_err("failed with %d\n", ret);
719 return ret;
720
721}
722
723static int snd_compress_remove_device(struct snd_compr *device)
724{
725 return snd_card_free(device->card);
726}
727
728/**
729 * snd_compress_register - register compressed device
730 *
731 * @device: compressed device to register
732 */
733int snd_compress_register(struct snd_compr *device)
734{
735 int retval;
736
737 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
738 return -EINVAL;
739
740 pr_debug("Registering compressed device %s\n", device->name);
741 if (snd_BUG_ON(!device->ops->open))
742 return -EINVAL;
743 if (snd_BUG_ON(!device->ops->free))
744 return -EINVAL;
745 if (snd_BUG_ON(!device->ops->set_params))
746 return -EINVAL;
747 if (snd_BUG_ON(!device->ops->trigger))
748 return -EINVAL;
749
750 mutex_init(&device->lock);
751
752 /* register a compressed card */
753 mutex_lock(&device_mutex);
754 retval = snd_compress_add_device(device);
755 mutex_unlock(&device_mutex);
756 return retval;
757}
758EXPORT_SYMBOL_GPL(snd_compress_register);
759
760int snd_compress_deregister(struct snd_compr *device)
761{
762 pr_debug("Removing compressed device %s\n", device->name);
763 mutex_lock(&device_mutex);
764 snd_compress_remove_device(device);
765 mutex_unlock(&device_mutex);
766 return 0;
767}
768EXPORT_SYMBOL_GPL(snd_compress_deregister);
769
770static int __init snd_compress_init(void)
771{
772 return 0;
773}
774
775static void __exit snd_compress_exit(void)
776{
777}
778
779module_init(snd_compress_init);
780module_exit(snd_compress_exit);
781
782MODULE_DESCRIPTION("ALSA Compressed offload framework");
783MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
784MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)