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ALSA: compress_core: Update calc_avail to use cumulative values
[deliverable/linux.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{
17ac8e5c 163 memset(avail, 0, sizeof(*avail));
b21c60a4 164 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 165 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4
VK		 166
167 /* FIXME: This needs to be different for capture stream,
168 available is # of compressed data, for playback it's
169 remainder of buffer */
170
171 if (stream->runtime->total_bytes_available == 0 &&
172 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
173 pr_debug("detected init and someone forgot to do a write\n");
174 return stream->runtime->buffer_size;
175 }
176 pr_debug("app wrote %lld, DSP consumed %lld\n",
177 stream->runtime->total_bytes_available,
178 stream->runtime->total_bytes_transferred);
179 if (stream->runtime->total_bytes_available ==
180 stream->runtime->total_bytes_transferred) {
181 pr_debug("both pointers are same, returning full avail\n");
182 return stream->runtime->buffer_size;
183 }
184
4c28e32d
CK		 185 avail->avail = stream->runtime->buffer_size -
186 (stream->runtime->total_bytes_available -
187 stream->runtime->total_bytes_transferred);
188 pr_debug("ret avail as %lld\n", avail->avail);
189 return avail->avail;
b21c60a4
VK		 190}
191
192static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
193{
194 struct snd_compr_avail avail;
195
196 return snd_compr_calc_avail(stream, &avail);
197}
198
199static int
200snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
201{
202 struct snd_compr_avail ioctl_avail;
203 size_t avail;
204
205 avail = snd_compr_calc_avail(stream, &ioctl_avail);
206 ioctl_avail.avail = avail;
207
208 if (copy_to_user((__u64 __user *)arg,
209 &ioctl_avail, sizeof(ioctl_avail)))
210 return -EFAULT;
211 return 0;
212}
213
214static int snd_compr_write_data(struct snd_compr_stream *stream,
215 const char __user *buf, size_t count)
216{
217 void *dstn;
218 size_t copy;
219 struct snd_compr_runtime *runtime = stream->runtime;
220
221 dstn = runtime->buffer + runtime->app_pointer;
222 pr_debug("copying %ld at %lld\n",
223 (unsigned long)count, runtime->app_pointer);
224 if (count < runtime->buffer_size - runtime->app_pointer) {
225 if (copy_from_user(dstn, buf, count))
226 return -EFAULT;
227 runtime->app_pointer += count;
228 } else {
229 copy = runtime->buffer_size - runtime->app_pointer;
230 if (copy_from_user(dstn, buf, copy))
231 return -EFAULT;
232 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
233 return -EFAULT;
234 runtime->app_pointer = count - copy;
235 }
236 /* if DSP cares, let it know data has been written */
237 if (stream->ops->ack)
238 stream->ops->ack(stream, count);
239 return count;
240}
241
242static ssize_t snd_compr_write(struct file *f, const char __user *buf,
243 size_t count, loff_t *offset)
244{
245 struct snd_compr_file *data = f->private_data;
246 struct snd_compr_stream *stream;
247 size_t avail;
248 int retval;
249
250 if (snd_BUG_ON(!data))
251 return -EFAULT;
252
253 stream = &data->stream;
254 mutex_lock(&stream->device->lock);
255 /* write is allowed when stream is running or has been steup */
256 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
257 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
258 mutex_unlock(&stream->device->lock);
259 return -EBADFD;
260 }
261
262 avail = snd_compr_get_avail(stream);
263 pr_debug("avail returned %ld\n", (unsigned long)avail);
264 /* calculate how much we can write to buffer */
265 if (avail > count)
266 avail = count;
267
268 if (stream->ops->copy)
269 retval = stream->ops->copy(stream, buf, avail);
270 else
271 retval = snd_compr_write_data(stream, buf, avail);
272 if (retval > 0)
273 stream->runtime->total_bytes_available += retval;
274
275 /* while initiating the stream, write should be called before START
276 * call, so in setup move state */
277 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
278 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
279 pr_debug("stream prepared, Houston we are good to go\n");
280 }
281
282 mutex_unlock(&stream->device->lock);
283 return retval;
284}
285
286
287static ssize_t snd_compr_read(struct file *f, char __user *buf,
288 size_t count, loff_t *offset)
289{
290 return -ENXIO;
291}
292
293static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
294{
295 return -ENXIO;
296}
297
298static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
299{
300 if (stream->direction == SND_COMPRESS_PLAYBACK)
301 return POLLOUT | POLLWRNORM;
302 else
303 return POLLIN | POLLRDNORM;
304}
305
306static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
307{
308 struct snd_compr_file *data = f->private_data;
309 struct snd_compr_stream *stream;
310 size_t avail;
311 int retval = 0;
312
313 if (snd_BUG_ON(!data))
314 return -EFAULT;
315 stream = &data->stream;
316 if (snd_BUG_ON(!stream))
317 return -EFAULT;
318
319 mutex_lock(&stream->device->lock);
320 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
321 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
322 retval = -EBADFD;
323 goto out;
324 }
325 poll_wait(f, &stream->runtime->sleep, wait);
326
327 avail = snd_compr_get_avail(stream);
328 pr_debug("avail is %ld\n", (unsigned long)avail);
329 /* check if we have at least one fragment to fill */
330 switch (stream->runtime->state) {
331 case SNDRV_PCM_STATE_DRAINING:
332 /* stream has been woken up after drain is complete
333 * draining done so set stream state to stopped
334 */
335 retval = snd_compr_get_poll(stream);
336 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
337 break;
338 case SNDRV_PCM_STATE_RUNNING:
339 case SNDRV_PCM_STATE_PREPARED:
340 case SNDRV_PCM_STATE_PAUSED:
341 if (avail >= stream->runtime->fragment_size)
342 retval = snd_compr_get_poll(stream);
343 break;
344 default:
345 if (stream->direction == SND_COMPRESS_PLAYBACK)
346 retval = POLLOUT | POLLWRNORM | POLLERR;
347 else
348 retval = POLLIN | POLLRDNORM | POLLERR;
349 break;
350 }
351out:
352 mutex_unlock(&stream->device->lock);
353 return retval;
354}
355
356static int
357snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
358{
359 int retval;
360 struct snd_compr_caps caps;
361
362 if (!stream->ops->get_caps)
363 return -ENXIO;
364
365 retval = stream->ops->get_caps(stream, &caps);
366 if (retval)
367 goto out;
368 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
369 retval = -EFAULT;
370out:
371 return retval;
372}
373
374static int
375snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
376{
377 int retval;
378 struct snd_compr_codec_caps *caps;
379
380 if (!stream->ops->get_codec_caps)
381 return -ENXIO;
382
383 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
384 if (!caps)
385 return -ENOMEM;
386
387 retval = stream->ops->get_codec_caps(stream, caps);
388 if (retval)
389 goto out;
390 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
391 retval = -EFAULT;
392
393out:
394 kfree(caps);
395 return retval;
396}
397
398/* revisit this with snd_pcm_preallocate_xxx */
399static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
400 struct snd_compr_params *params)
401{
402 unsigned int buffer_size;
403 void *buffer;
404
405 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
406 if (stream->ops->copy) {
407 buffer = NULL;
408 /* if copy is defined the driver will be required to copy
409 * the data from core
410 */
411 } else {
412 buffer = kmalloc(buffer_size, GFP_KERNEL);
413 if (!buffer)
414 return -ENOMEM;
415 }
416 stream->runtime->fragment_size = params->buffer.fragment_size;
417 stream->runtime->fragments = params->buffer.fragments;
418 stream->runtime->buffer = buffer;
419 stream->runtime->buffer_size = buffer_size;
420 return 0;
421}
422
4dc040a0
VK		 423static int snd_compress_check_input(struct snd_compr_params *params)
424{
425 /* first let's check the buffer parameter's */
426 if (params->buffer.fragment_size == 0 ||
427 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
428 return -EINVAL;
429
fb4a9779
VK		 430 /* now codec parameters */
431 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
432 return -EINVAL;
433
434 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
435 return -EINVAL;
436
437 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
438 return -EINVAL;
439
4dc040a0
VK		 440 return 0;
441}
442
b21c60a4
VK		 443static int
444snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
445{
446 struct snd_compr_params *params;
447 int retval;
448
449 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
450 /*
451 * we should allow parameter change only when stream has been
452 * opened not in other cases
453 */
454 params = kmalloc(sizeof(*params), GFP_KERNEL);
455 if (!params)
456 return -ENOMEM;
769fab2a
JJ		 457 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
458 retval = -EFAULT;
459 goto out;
460 }
4dc040a0
VK		 461
462 retval = snd_compress_check_input(params);
463 if (retval)
464 goto out;
465
b21c60a4
VK		 466 retval = snd_compr_allocate_buffer(stream, params);
467 if (retval) {
769fab2a
JJ		 468 retval = -ENOMEM;
469 goto out;
b21c60a4 470 }
4dc040a0 471
b21c60a4
VK		 472 retval = stream->ops->set_params(stream, params);
473 if (retval)
474 goto out;
475 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
9727b490
JK		 476 stream->metadata_set = false;
477 stream->next_track = false;
769fab2a 478 } else {
b21c60a4 479 return -EPERM;
769fab2a 480 }
b21c60a4
VK		 481out:
482 kfree(params);
483 return retval;
484}
485
486static int
487snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
488{
489 struct snd_codec *params;
490 int retval;
491
492 if (!stream->ops->get_params)
493 return -EBADFD;
494
495 params = kmalloc(sizeof(*params), GFP_KERNEL);
496 if (!params)
497 return -ENOMEM;
498 retval = stream->ops->get_params(stream, params);
499 if (retval)
500 goto out;
501 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
502 retval = -EFAULT;
503
504out:
505 kfree(params);
506 return retval;
507}
508
9727b490
JK		 509static int
510snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
511{
512 struct snd_compr_metadata metadata;
513 int retval;
514
515 if (!stream->ops->get_metadata)
516 return -ENXIO;
517
518 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
519 return -EFAULT;
520
521 retval = stream->ops->get_metadata(stream, &metadata);
522 if (retval != 0)
523 return retval;
524
525 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
526 return -EFAULT;
527
528 return 0;
529}
530
531static int
532snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
533{
534 struct snd_compr_metadata metadata;
535 int retval;
536
537 if (!stream->ops->set_metadata)
538 return -ENXIO;
539 /*
540 * we should allow parameter change only when stream has been
541 * opened not in other cases
542 */
543 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
544 return -EFAULT;
545
546 retval = stream->ops->set_metadata(stream, &metadata);
547 stream->metadata_set = true;
548
549 return retval;
550}
551
b21c60a4
VK		 552static inline int
553snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
554{
17ac8e5c
RF		 555 struct snd_compr_tstamp tstamp = {0};
556 int ret;
b21c60a4 557
17ac8e5c
RF		 558 ret = snd_compr_update_tstamp(stream, &tstamp);
559 if (ret == 0)
560 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
561 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
562 return ret;
b21c60a4
VK		 563}
564
565static int snd_compr_pause(struct snd_compr_stream *stream)
566{
567 int retval;
568
569 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
570 return -EPERM;
571 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 572 if (!retval)
b21c60a4 573 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 574 return retval;
575}
576
577static int snd_compr_resume(struct snd_compr_stream *stream)
578{
579 int retval;
580
581 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
582 return -EPERM;
583 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
584 if (!retval)
585 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
586 return retval;
587}
588
589static int snd_compr_start(struct snd_compr_stream *stream)
590{
591 int retval;
592
593 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
594 return -EPERM;
595 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
596 if (!retval)
597 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
598 return retval;
599}
600
601static int snd_compr_stop(struct snd_compr_stream *stream)
602{
603 int retval;
604
605 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
606 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
607 return -EPERM;
608 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
609 if (!retval) {
610 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
611 wake_up(&stream->runtime->sleep);
8b21460a
VK		 612 stream->runtime->hw_pointer = 0;
613 stream->runtime->app_pointer = 0;
614 stream->runtime->total_bytes_available = 0;
615 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 616 }
617 return retval;
618}
619
620static int snd_compr_drain(struct snd_compr_stream *stream)
621{
622 int retval;
623
624 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
625 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
626 return -EPERM;
627 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
628 if (!retval) {
629 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
630 wake_up(&stream->runtime->sleep);
631 }
632 return retval;
633}
634
9727b490
JK		 635static int snd_compr_next_track(struct snd_compr_stream *stream)
636{
637 int retval;
638
639 /* only a running stream can transition to next track */
640 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
641 return -EPERM;
642
643 /* you can signal next track isf this is intended to be a gapless stream
644 * and current track metadata is set
645 */
646 if (stream->metadata_set == false)
647 return -EPERM;
648
649 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
650 if (retval != 0)
651 return retval;
652 stream->metadata_set = false;
653 stream->next_track = true;
654 return 0;
655}
656
657static int snd_compr_partial_drain(struct snd_compr_stream *stream)
658{
659 int retval;
660 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
661 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
662 return -EPERM;
663 /* stream can be drained only when next track has been signalled */
664 if (stream->next_track == false)
665 return -EPERM;
666
667 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
668
669 stream->next_track = false;
670 return retval;
671}
672
b21c60a4
VK		 673static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
674{
675 struct snd_compr_file *data = f->private_data;
676 struct snd_compr_stream *stream;
677 int retval = -ENOTTY;
678
679 if (snd_BUG_ON(!data))
680 return -EFAULT;
681 stream = &data->stream;
682 if (snd_BUG_ON(!stream))
683 return -EFAULT;
684 mutex_lock(&stream->device->lock);
685 switch (_IOC_NR(cmd)) {
686 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
687 put_user(SNDRV_COMPRESS_VERSION,
688 (int __user *)arg) ? -EFAULT : 0;
689 break;
690 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
691 retval = snd_compr_get_caps(stream, arg);
692 break;
693 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
694 retval = snd_compr_get_codec_caps(stream, arg);
695 break;
696 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
697 retval = snd_compr_set_params(stream, arg);
698 break;
699 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
700 retval = snd_compr_get_params(stream, arg);
701 break;
9727b490
JK		 702 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
703 retval = snd_compr_set_metadata(stream, arg);
704 break;
705 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
706 retval = snd_compr_get_metadata(stream, arg);
707 break;
b21c60a4
VK		 708 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
709 retval = snd_compr_tstamp(stream, arg);
710 break;
711 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
712 retval = snd_compr_ioctl_avail(stream, arg);
713 break;
714 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
715 retval = snd_compr_pause(stream);
716 break;
717 case _IOC_NR(SNDRV_COMPRESS_RESUME):
718 retval = snd_compr_resume(stream);
719 break;
720 case _IOC_NR(SNDRV_COMPRESS_START):
721 retval = snd_compr_start(stream);
722 break;
723 case _IOC_NR(SNDRV_COMPRESS_STOP):
724 retval = snd_compr_stop(stream);
725 break;
726 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
727 retval = snd_compr_drain(stream);
728 break;
9727b490
JK		 729 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
730 retval = snd_compr_partial_drain(stream);
731 break;
732 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
733 retval = snd_compr_next_track(stream);
734 break;
735
b21c60a4
VK		 736 }
737 mutex_unlock(&stream->device->lock);
738 return retval;
739}
740
741static const struct file_operations snd_compr_file_ops = {
742 .owner = THIS_MODULE,
743 .open = snd_compr_open,
744 .release = snd_compr_free,
745 .write = snd_compr_write,
746 .read = snd_compr_read,
747 .unlocked_ioctl = snd_compr_ioctl,
748 .mmap = snd_compr_mmap,
749 .poll = snd_compr_poll,
750};
751
752static int snd_compress_dev_register(struct snd_device *device)
753{
754 int ret = -EINVAL;
755 char str[16];
756 struct snd_compr *compr;
757
758 if (snd_BUG_ON(!device || !device->device_data))
759 return -EBADFD;
760 compr = device->device_data;
761
762 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
763 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
764 compr->direction);
765 /* register compressed device */
766 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
767 compr->device, &snd_compr_file_ops, compr, str);
768 if (ret < 0) {
769 pr_err("snd_register_device failed\n %d", ret);
770 return ret;
771 }
772 return ret;
773
774}
775
776static int snd_compress_dev_disconnect(struct snd_device *device)
777{
778 struct snd_compr *compr;
779
780 compr = device->device_data;
781 snd_unregister_device(compr->direction, compr->card, compr->device);
782 return 0;
783}
784
785/*
786 * snd_compress_new: create new compress device
787 * @card: sound card pointer
788 * @device: device number
789 * @dirn: device direction, should be of type enum snd_compr_direction
790 * @compr: compress device pointer
791 */
792int snd_compress_new(struct snd_card *card, int device,
793 int dirn, struct snd_compr *compr)
794{
795 static struct snd_device_ops ops = {
796 .dev_free = NULL,
797 .dev_register = snd_compress_dev_register,
798 .dev_disconnect = snd_compress_dev_disconnect,
799 };
800
801 compr->card = card;
802 compr->device = device;
803 compr->direction = dirn;
804 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
805}
806EXPORT_SYMBOL_GPL(snd_compress_new);
807
808static int snd_compress_add_device(struct snd_compr *device)
809{
810 int ret;
811
812 if (!device->card)
813 return -EINVAL;
814
815 /* register the card */
816 ret = snd_card_register(device->card);
817 if (ret)
818 goto out;
819 return 0;
820
821out:
822 pr_err("failed with %d\n", ret);
823 return ret;
824
825}
826
827static int snd_compress_remove_device(struct snd_compr *device)
828{
829 return snd_card_free(device->card);
830}
831
832/**
833 * snd_compress_register - register compressed device
834 *
835 * @device: compressed device to register
836 */
837int snd_compress_register(struct snd_compr *device)
838{
839 int retval;
840
841 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
842 return -EINVAL;
843
844 pr_debug("Registering compressed device %s\n", device->name);
845 if (snd_BUG_ON(!device->ops->open))
846 return -EINVAL;
847 if (snd_BUG_ON(!device->ops->free))
848 return -EINVAL;
849 if (snd_BUG_ON(!device->ops->set_params))
850 return -EINVAL;
851 if (snd_BUG_ON(!device->ops->trigger))
852 return -EINVAL;
853
854 mutex_init(&device->lock);
855
856 /* register a compressed card */
857 mutex_lock(&device_mutex);
858 retval = snd_compress_add_device(device);
859 mutex_unlock(&device_mutex);
860 return retval;
861}
862EXPORT_SYMBOL_GPL(snd_compress_register);
863
864int snd_compress_deregister(struct snd_compr *device)
865{
866 pr_debug("Removing compressed device %s\n", device->name);
867 mutex_lock(&device_mutex);
868 snd_compress_remove_device(device);
869 mutex_unlock(&device_mutex);
870 return 0;
871}
872EXPORT_SYMBOL_GPL(snd_compress_deregister);
873
874static int __init snd_compress_init(void)
875{
876 return 0;
877}
878
879static void __exit snd_compress_exit(void)
880{
881}
882
883module_init(snd_compress_init);
884module_exit(snd_compress_exit);
885
886MODULE_DESCRIPTION("ALSA Compressed offload framework");
887MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
888MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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