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ALSA: hda - hdmi: Fix wrong baseline length in ATI/AMD generated ELD
[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>
f0283b58 31#include <linux/math64.h>
b21c60a4
VK		 32#include <linux/mm.h>
33#include <linux/mutex.h>
34#include <linux/poll.h>
35#include <linux/slab.h>
36#include <linux/sched.h>
f0283b58 37#include <linux/types.h>
b21c60a4
VK		 38#include <linux/uio.h>
39#include <linux/uaccess.h>
40#include <linux/module.h>
41#include <sound/core.h>
42#include <sound/initval.h>
43#include <sound/compress_params.h>
44#include <sound/compress_offload.h>
45#include <sound/compress_driver.h>
46
47/* TODO:
48 * - add substream support for multiple devices in case of
49 * SND_DYNAMIC_MINORS is not used
50 * - Multiple node representation
51 * driver should be able to register multiple nodes
52 */
53
54static DEFINE_MUTEX(device_mutex);
55
56struct snd_compr_file {
57 unsigned long caps;
58 struct snd_compr_stream stream;
59};
60
61/*
62 * a note on stream states used:
63 * we use follwing states in the compressed core
64 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
65 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
66 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
67 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
68 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
69 * decoding/encoding and rendering/capturing data.
70 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
71 * by calling SNDRV_COMPRESS_DRAIN.
72 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
73 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
74 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
75 */
76static int snd_compr_open(struct inode *inode, struct file *f)
77{
78 struct snd_compr *compr;
79 struct snd_compr_file *data;
80 struct snd_compr_runtime *runtime;
81 enum snd_compr_direction dirn;
82 int maj = imajor(inode);
83 int ret;
84
81cb3246 85 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
b21c60a4 86 dirn = SND_COMPRESS_PLAYBACK;
81cb3246 87 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
b21c60a4 88 dirn = SND_COMPRESS_CAPTURE;
81cb3246 89 else
b21c60a4 90 return -EINVAL;
b21c60a4
VK		 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");
a0830dbd 105 snd_card_unref(compr->card);
b21c60a4
VK		 106 return -EINVAL;
107 }
108
109 data = kzalloc(sizeof(*data), GFP_KERNEL);
a0830dbd
TI		 110 if (!data) {
111 snd_card_unref(compr->card);
b21c60a4 112 return -ENOMEM;
a0830dbd 113 }
b21c60a4
VK		 114 data->stream.ops = compr->ops;
115 data->stream.direction = dirn;
116 data->stream.private_data = compr->private_data;
117 data->stream.device = compr;
118 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119 if (!runtime) {
120 kfree(data);
a0830dbd 121 snd_card_unref(compr->card);
b21c60a4
VK		 122 return -ENOMEM;
123 }
124 runtime->state = SNDRV_PCM_STATE_OPEN;
125 init_waitqueue_head(&runtime->sleep);
126 data->stream.runtime = runtime;
127 f->private_data = (void *)data;
128 mutex_lock(&compr->lock);
129 ret = compr->ops->open(&data->stream);
130 mutex_unlock(&compr->lock);
131 if (ret) {
132 kfree(runtime);
133 kfree(data);
134 }
a0830dbd
TI		 135 snd_card_unref(compr->card);
136 return 0;
b21c60a4
VK		 137}
138
139static int snd_compr_free(struct inode *inode, struct file *f)
140{
141 struct snd_compr_file *data = f->private_data;
b26d19e4
LG		 142 struct snd_compr_runtime *runtime = data->stream.runtime;
143
144 switch (runtime->state) {
145 case SNDRV_PCM_STATE_RUNNING:
146 case SNDRV_PCM_STATE_DRAINING:
147 case SNDRV_PCM_STATE_PAUSED:
148 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
149 break;
150 default:
151 break;
152 }
153
b21c60a4
VK		 154 data->stream.ops->free(&data->stream);
155 kfree(data->stream.runtime->buffer);
156 kfree(data->stream.runtime);
157 kfree(data);
158 return 0;
159}
160
17ac8e5c 161static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
b21c60a4
VK		 162 struct snd_compr_tstamp *tstamp)
163{
164 if (!stream->ops->pointer)
17ac8e5c 165 return -ENOTSUPP;
b21c60a4
VK		 166 stream->ops->pointer(stream, tstamp);
167 pr_debug("dsp consumed till %d total %d bytes\n",
168 tstamp->byte_offset, tstamp->copied_total);
5b1f79f7
CK		 169 if (stream->direction == SND_COMPRESS_PLAYBACK)
170 stream->runtime->total_bytes_transferred = tstamp->copied_total;
171 else
172 stream->runtime->total_bytes_available = tstamp->copied_total;
17ac8e5c 173 return 0;
b21c60a4
VK		 174}
175
176static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
177 struct snd_compr_avail *avail)
178{
17ac8e5c 179 memset(avail, 0, sizeof(*avail));
b21c60a4 180 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 181 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4 182
b21c60a4 183 if (stream->runtime->total_bytes_available == 0 &&
5b1f79f7
CK		 184 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
185 stream->direction == SND_COMPRESS_PLAYBACK) {
b21c60a4
VK		 186 pr_debug("detected init and someone forgot to do a write\n");
187 return stream->runtime->buffer_size;
188 }
189 pr_debug("app wrote %lld, DSP consumed %lld\n",
190 stream->runtime->total_bytes_available,
191 stream->runtime->total_bytes_transferred);
192 if (stream->runtime->total_bytes_available ==
193 stream->runtime->total_bytes_transferred) {
5b1f79f7
CK		 194 if (stream->direction == SND_COMPRESS_PLAYBACK) {
195 pr_debug("both pointers are same, returning full avail\n");
196 return stream->runtime->buffer_size;
197 } else {
198 pr_debug("both pointers are same, returning no avail\n");
199 return 0;
200 }
b21c60a4
VK		 201 }
202
5b1f79f7
CK		 203 avail->avail = stream->runtime->total_bytes_available -
204 stream->runtime->total_bytes_transferred;
205 if (stream->direction == SND_COMPRESS_PLAYBACK)
206 avail->avail = stream->runtime->buffer_size - avail->avail;
207
4c28e32d
CK		 208 pr_debug("ret avail as %lld\n", avail->avail);
209 return avail->avail;
b21c60a4
VK		 210}
211
212static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
213{
214 struct snd_compr_avail avail;
215
216 return snd_compr_calc_avail(stream, &avail);
217}
218
219static int
220snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
221{
222 struct snd_compr_avail ioctl_avail;
223 size_t avail;
224
225 avail = snd_compr_calc_avail(stream, &ioctl_avail);
226 ioctl_avail.avail = avail;
227
228 if (copy_to_user((__u64 __user *)arg,
229 &ioctl_avail, sizeof(ioctl_avail)))
230 return -EFAULT;
231 return 0;
232}
233
234static int snd_compr_write_data(struct snd_compr_stream *stream,
235 const char __user *buf, size_t count)
236{
237 void *dstn;
238 size_t copy;
239 struct snd_compr_runtime *runtime = stream->runtime;
f0283b58
CK		 240 /* 64-bit Modulus */
241 u64 app_pointer = div64_u64(runtime->total_bytes_available,
242 runtime->buffer_size);
243 app_pointer = runtime->total_bytes_available -
244 (app_pointer * runtime->buffer_size);
b21c60a4 245
f0283b58 246 dstn = runtime->buffer + app_pointer;
b21c60a4 247 pr_debug("copying %ld at %lld\n",
f0283b58
CK		 248 (unsigned long)count, app_pointer);
249 if (count < runtime->buffer_size - app_pointer) {
b21c60a4
VK		 250 if (copy_from_user(dstn, buf, count))
251 return -EFAULT;
b21c60a4 252 } else {
f0283b58 253 copy = runtime->buffer_size - app_pointer;
b21c60a4
VK		 254 if (copy_from_user(dstn, buf, copy))
255 return -EFAULT;
256 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
257 return -EFAULT;
b21c60a4
VK		 258 }
259 /* if DSP cares, let it know data has been written */
260 if (stream->ops->ack)
261 stream->ops->ack(stream, count);
262 return count;
263}
264
265static ssize_t snd_compr_write(struct file *f, const char __user *buf,
266 size_t count, loff_t *offset)
267{
268 struct snd_compr_file *data = f->private_data;
269 struct snd_compr_stream *stream;
270 size_t avail;
271 int retval;
272
273 if (snd_BUG_ON(!data))
274 return -EFAULT;
275
276 stream = &data->stream;
277 mutex_lock(&stream->device->lock);
278 /* write is allowed when stream is running or has been steup */
279 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
280 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
281 mutex_unlock(&stream->device->lock);
282 return -EBADFD;
283 }
284
285 avail = snd_compr_get_avail(stream);
286 pr_debug("avail returned %ld\n", (unsigned long)avail);
287 /* calculate how much we can write to buffer */
288 if (avail > count)
289 avail = count;
290
4daf891c
CK		 291 if (stream->ops->copy) {
292 char __user* cbuf = (char __user*)buf;
293 retval = stream->ops->copy(stream, cbuf, avail);
294 } else {
b21c60a4 295 retval = snd_compr_write_data(stream, buf, avail);
4daf891c 296 }
b21c60a4
VK		 297 if (retval > 0)
298 stream->runtime->total_bytes_available += retval;
299
300 /* while initiating the stream, write should be called before START
301 * call, so in setup move state */
302 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
303 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
304 pr_debug("stream prepared, Houston we are good to go\n");
305 }
306
307 mutex_unlock(&stream->device->lock);
308 return retval;
309}
310
311
312static ssize_t snd_compr_read(struct file *f, char __user *buf,
313 size_t count, loff_t *offset)
314{
49bb6402
CK		 315 struct snd_compr_file *data = f->private_data;
316 struct snd_compr_stream *stream;
317 size_t avail;
318 int retval;
319
320 if (snd_BUG_ON(!data))
321 return -EFAULT;
322
323 stream = &data->stream;
324 mutex_lock(&stream->device->lock);
325
75481347
VK		 326 /* read is allowed when stream is running, paused, draining and setup
327 * (yes setup is state which we transition to after stop, so if user
328 * wants to read data after stop we allow that)
329 */
330 switch (stream->runtime->state) {
331 case SNDRV_PCM_STATE_OPEN:
332 case SNDRV_PCM_STATE_PREPARED:
333 case SNDRV_PCM_STATE_XRUN:
334 case SNDRV_PCM_STATE_SUSPENDED:
335 case SNDRV_PCM_STATE_DISCONNECTED:
49bb6402
CK		 336 retval = -EBADFD;
337 goto out;
338 }
339
340 avail = snd_compr_get_avail(stream);
341 pr_debug("avail returned %ld\n", (unsigned long)avail);
342 /* calculate how much we can read from buffer */
343 if (avail > count)
344 avail = count;
345
346 if (stream->ops->copy) {
347 retval = stream->ops->copy(stream, buf, avail);
348 } else {
349 retval = -ENXIO;
350 goto out;
351 }
352 if (retval > 0)
353 stream->runtime->total_bytes_transferred += retval;
354
355out:
356 mutex_unlock(&stream->device->lock);
357 return retval;
b21c60a4
VK		 358}
359
360static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
361{
362 return -ENXIO;
363}
364
365static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
366{
367 if (stream->direction == SND_COMPRESS_PLAYBACK)
368 return POLLOUT | POLLWRNORM;
369 else
370 return POLLIN | POLLRDNORM;
371}
372
373static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
374{
375 struct snd_compr_file *data = f->private_data;
376 struct snd_compr_stream *stream;
377 size_t avail;
378 int retval = 0;
379
380 if (snd_BUG_ON(!data))
381 return -EFAULT;
382 stream = &data->stream;
383 if (snd_BUG_ON(!stream))
384 return -EFAULT;
385
386 mutex_lock(&stream->device->lock);
387 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
388 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
389 retval = -EBADFD;
390 goto out;
391 }
392 poll_wait(f, &stream->runtime->sleep, wait);
393
394 avail = snd_compr_get_avail(stream);
395 pr_debug("avail is %ld\n", (unsigned long)avail);
396 /* check if we have at least one fragment to fill */
397 switch (stream->runtime->state) {
398 case SNDRV_PCM_STATE_DRAINING:
399 /* stream has been woken up after drain is complete
400 * draining done so set stream state to stopped
401 */
402 retval = snd_compr_get_poll(stream);
403 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
404 break;
405 case SNDRV_PCM_STATE_RUNNING:
406 case SNDRV_PCM_STATE_PREPARED:
407 case SNDRV_PCM_STATE_PAUSED:
408 if (avail >= stream->runtime->fragment_size)
409 retval = snd_compr_get_poll(stream);
410 break;
411 default:
412 if (stream->direction == SND_COMPRESS_PLAYBACK)
413 retval = POLLOUT | POLLWRNORM | POLLERR;
414 else
415 retval = POLLIN | POLLRDNORM | POLLERR;
416 break;
417 }
418out:
419 mutex_unlock(&stream->device->lock);
420 return retval;
421}
422
423static int
424snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
425{
426 int retval;
427 struct snd_compr_caps caps;
428
429 if (!stream->ops->get_caps)
430 return -ENXIO;
431
1c62e9f2 432 memset(&caps, 0, sizeof(caps));
b21c60a4
VK		 433 retval = stream->ops->get_caps(stream, &caps);
434 if (retval)
435 goto out;
436 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
437 retval = -EFAULT;
438out:
439 return retval;
440}
441
442static int
443snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
444{
445 int retval;
446 struct snd_compr_codec_caps *caps;
447
448 if (!stream->ops->get_codec_caps)
449 return -ENXIO;
450
47966e97 451 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
b21c60a4
VK		 452 if (!caps)
453 return -ENOMEM;
454
455 retval = stream->ops->get_codec_caps(stream, caps);
456 if (retval)
457 goto out;
458 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
459 retval = -EFAULT;
460
461out:
462 kfree(caps);
463 return retval;
464}
465
466/* revisit this with snd_pcm_preallocate_xxx */
467static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
468 struct snd_compr_params *params)
469{
470 unsigned int buffer_size;
471 void *buffer;
472
473 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
474 if (stream->ops->copy) {
475 buffer = NULL;
476 /* if copy is defined the driver will be required to copy
477 * the data from core
478 */
479 } else {
480 buffer = kmalloc(buffer_size, GFP_KERNEL);
481 if (!buffer)
482 return -ENOMEM;
483 }
484 stream->runtime->fragment_size = params->buffer.fragment_size;
485 stream->runtime->fragments = params->buffer.fragments;
486 stream->runtime->buffer = buffer;
487 stream->runtime->buffer_size = buffer_size;
488 return 0;
489}
490
4dc040a0
VK		 491static int snd_compress_check_input(struct snd_compr_params *params)
492{
493 /* first let's check the buffer parameter's */
494 if (params->buffer.fragment_size == 0 ||
495 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
496 return -EINVAL;
497
fb4a9779
VK		 498 /* now codec parameters */
499 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
500 return -EINVAL;
501
502 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
503 return -EINVAL;
504
505 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
506 return -EINVAL;
507
4dc040a0
VK		 508 return 0;
509}
510
b21c60a4
VK		 511static int
512snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
513{
514 struct snd_compr_params *params;
515 int retval;
516
517 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
518 /*
519 * we should allow parameter change only when stream has been
520 * opened not in other cases
521 */
522 params = kmalloc(sizeof(*params), GFP_KERNEL);
523 if (!params)
524 return -ENOMEM;
769fab2a
JJ		 525 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
526 retval = -EFAULT;
527 goto out;
528 }
4dc040a0
VK		 529
530 retval = snd_compress_check_input(params);
531 if (retval)
532 goto out;
533
b21c60a4
VK		 534 retval = snd_compr_allocate_buffer(stream, params);
535 if (retval) {
769fab2a
JJ		 536 retval = -ENOMEM;
537 goto out;
b21c60a4 538 }
4dc040a0 539
b21c60a4
VK		 540 retval = stream->ops->set_params(stream, params);
541 if (retval)
542 goto out;
49bb6402 543
9727b490
JK		 544 stream->metadata_set = false;
545 stream->next_track = false;
49bb6402
CK		 546
547 if (stream->direction == SND_COMPRESS_PLAYBACK)
548 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
549 else
550 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
769fab2a 551 } else {
b21c60a4 552 return -EPERM;
769fab2a 553 }
b21c60a4
VK		 554out:
555 kfree(params);
556 return retval;
557}
558
559static int
560snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
561{
562 struct snd_codec *params;
563 int retval;
564
565 if (!stream->ops->get_params)
566 return -EBADFD;
567
47966e97 568 params = kzalloc(sizeof(*params), GFP_KERNEL);
b21c60a4
VK		 569 if (!params)
570 return -ENOMEM;
571 retval = stream->ops->get_params(stream, params);
572 if (retval)
573 goto out;
574 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
575 retval = -EFAULT;
576
577out:
578 kfree(params);
579 return retval;
580}
581
9727b490
JK		 582static int
583snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
584{
585 struct snd_compr_metadata metadata;
586 int retval;
587
588 if (!stream->ops->get_metadata)
589 return -ENXIO;
590
591 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
592 return -EFAULT;
593
594 retval = stream->ops->get_metadata(stream, &metadata);
595 if (retval != 0)
596 return retval;
597
598 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
599 return -EFAULT;
600
601 return 0;
602}
603
604static int
605snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
606{
607 struct snd_compr_metadata metadata;
608 int retval;
609
610 if (!stream->ops->set_metadata)
611 return -ENXIO;
612 /*
613 * we should allow parameter change only when stream has been
614 * opened not in other cases
615 */
616 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
617 return -EFAULT;
618
619 retval = stream->ops->set_metadata(stream, &metadata);
620 stream->metadata_set = true;
621
622 return retval;
623}
624
b21c60a4
VK		 625static inline int
626snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
627{
17ac8e5c
RF		 628 struct snd_compr_tstamp tstamp = {0};
629 int ret;
b21c60a4 630
17ac8e5c
RF		 631 ret = snd_compr_update_tstamp(stream, &tstamp);
632 if (ret == 0)
633 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
634 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
635 return ret;
b21c60a4
VK		 636}
637
638static int snd_compr_pause(struct snd_compr_stream *stream)
639{
640 int retval;
641
642 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
643 return -EPERM;
644 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 645 if (!retval)
b21c60a4 646 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 647 return retval;
648}
649
650static int snd_compr_resume(struct snd_compr_stream *stream)
651{
652 int retval;
653
654 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
655 return -EPERM;
656 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
657 if (!retval)
658 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
659 return retval;
660}
661
662static int snd_compr_start(struct snd_compr_stream *stream)
663{
664 int retval;
665
666 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
667 return -EPERM;
668 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
669 if (!retval)
670 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
671 return retval;
672}
673
674static int snd_compr_stop(struct snd_compr_stream *stream)
675{
676 int retval;
677
678 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
679 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
680 return -EPERM;
681 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
682 if (!retval) {
917f4b5c 683 snd_compr_drain_notify(stream);
8b21460a
VK		 684 stream->runtime->total_bytes_available = 0;
685 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 686 }
687 return retval;
688}
689
917f4b5c
VK		 690static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
691{
f44f2a54
VK		 692 int ret;
693
917f4b5c
VK		 694 /*
695 * We are called with lock held. So drop the lock while we wait for
696 * drain complete notfication from the driver
697 *
698 * It is expected that driver will notify the drain completion and then
699 * stream will be moved to SETUP state, even if draining resulted in an
700 * error. We can trigger next track after this.
701 */
702 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
703 mutex_unlock(&stream->device->lock);
704
f44f2a54
VK		 705 /* we wait for drain to complete here, drain can return when
706 * interruption occurred, wait returned error or success.
707 * For the first two cases we don't do anything different here and
708 * return after waking up
709 */
710
711 ret = wait_event_interruptible(stream->runtime->sleep,
712 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
713 if (ret == -ERESTARTSYS)
714 pr_debug("wait aborted by a signal");
715 else if (ret)
716 pr_debug("wait for drain failed with %d\n", ret);
717
917f4b5c
VK		 718
719 wake_up(&stream->runtime->sleep);
720 mutex_lock(&stream->device->lock);
721
f44f2a54 722 return ret;
917f4b5c
VK		 723}
724
b21c60a4
VK		 725static int snd_compr_drain(struct snd_compr_stream *stream)
726{
727 int retval;
728
729 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
730 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
731 return -EPERM;
917f4b5c 732
b21c60a4 733 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
917f4b5c 734 if (retval) {
f44f2a54 735 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
b21c60a4 736 wake_up(&stream->runtime->sleep);
917f4b5c 737 return retval;
b21c60a4 738 }
917f4b5c 739
f44f2a54 740 return snd_compress_wait_for_drain(stream);
b21c60a4
VK		 741}
742
9727b490
JK		 743static int snd_compr_next_track(struct snd_compr_stream *stream)
744{
745 int retval;
746
747 /* only a running stream can transition to next track */
748 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
749 return -EPERM;
750
751 /* you can signal next track isf this is intended to be a gapless stream
752 * and current track metadata is set
753 */
754 if (stream->metadata_set == false)
755 return -EPERM;
756
757 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
758 if (retval != 0)
759 return retval;
760 stream->metadata_set = false;
761 stream->next_track = true;
762 return 0;
763}
764
765static int snd_compr_partial_drain(struct snd_compr_stream *stream)
766{
767 int retval;
768 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
769 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
770 return -EPERM;
771 /* stream can be drained only when next track has been signalled */
772 if (stream->next_track == false)
773 return -EPERM;
774
775 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
917f4b5c 776 if (retval) {
f44f2a54 777 pr_debug("Partial drain returned failure\n");
917f4b5c
VK		 778 wake_up(&stream->runtime->sleep);
779 return retval;
780 }
9727b490
JK		 781
782 stream->next_track = false;
917f4b5c 783 return snd_compress_wait_for_drain(stream);
9727b490
JK		 784}
785
b21c60a4
VK		 786static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
787{
788 struct snd_compr_file *data = f->private_data;
789 struct snd_compr_stream *stream;
790 int retval = -ENOTTY;
791
792 if (snd_BUG_ON(!data))
793 return -EFAULT;
794 stream = &data->stream;
795 if (snd_BUG_ON(!stream))
796 return -EFAULT;
797 mutex_lock(&stream->device->lock);
798 switch (_IOC_NR(cmd)) {
799 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
a8d30608 800 retval = put_user(SNDRV_COMPRESS_VERSION,
b21c60a4
VK		 801 (int __user *)arg) ? -EFAULT : 0;
802 break;
803 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
804 retval = snd_compr_get_caps(stream, arg);
805 break;
806 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
807 retval = snd_compr_get_codec_caps(stream, arg);
808 break;
809 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
810 retval = snd_compr_set_params(stream, arg);
811 break;
812 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
813 retval = snd_compr_get_params(stream, arg);
814 break;
9727b490
JK		 815 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
816 retval = snd_compr_set_metadata(stream, arg);
817 break;
818 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
819 retval = snd_compr_get_metadata(stream, arg);
820 break;
b21c60a4
VK		 821 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
822 retval = snd_compr_tstamp(stream, arg);
823 break;
824 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
825 retval = snd_compr_ioctl_avail(stream, arg);
826 break;
827 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
828 retval = snd_compr_pause(stream);
829 break;
830 case _IOC_NR(SNDRV_COMPRESS_RESUME):
831 retval = snd_compr_resume(stream);
832 break;
833 case _IOC_NR(SNDRV_COMPRESS_START):
834 retval = snd_compr_start(stream);
835 break;
836 case _IOC_NR(SNDRV_COMPRESS_STOP):
837 retval = snd_compr_stop(stream);
838 break;
839 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
840 retval = snd_compr_drain(stream);
841 break;
9727b490
JK		 842 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
843 retval = snd_compr_partial_drain(stream);
844 break;
845 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
846 retval = snd_compr_next_track(stream);
847 break;
848
b21c60a4
VK		 849 }
850 mutex_unlock(&stream->device->lock);
851 return retval;
852}
853
854static const struct file_operations snd_compr_file_ops = {
855 .owner = THIS_MODULE,
856 .open = snd_compr_open,
857 .release = snd_compr_free,
858 .write = snd_compr_write,
859 .read = snd_compr_read,
860 .unlocked_ioctl = snd_compr_ioctl,
861 .mmap = snd_compr_mmap,
862 .poll = snd_compr_poll,
863};
864
865static int snd_compress_dev_register(struct snd_device *device)
866{
867 int ret = -EINVAL;
868 char str[16];
869 struct snd_compr *compr;
870
871 if (snd_BUG_ON(!device || !device->device_data))
872 return -EBADFD;
873 compr = device->device_data;
874
875 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
876 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
877 compr->direction);
878 /* register compressed device */
879 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
880 compr->device, &snd_compr_file_ops, compr, str);
881 if (ret < 0) {
882 pr_err("snd_register_device failed\n %d", ret);
883 return ret;
884 }
885 return ret;
886
887}
888
889static int snd_compress_dev_disconnect(struct snd_device *device)
890{
891 struct snd_compr *compr;
892
893 compr = device->device_data;
4028b6c4
LG		 894 snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
895 compr->device);
b21c60a4
VK		 896 return 0;
897}
898
899/*
900 * snd_compress_new: create new compress device
901 * @card: sound card pointer
902 * @device: device number
903 * @dirn: device direction, should be of type enum snd_compr_direction
904 * @compr: compress device pointer
905 */
906int snd_compress_new(struct snd_card *card, int device,
907 int dirn, struct snd_compr *compr)
908{
909 static struct snd_device_ops ops = {
910 .dev_free = NULL,
911 .dev_register = snd_compress_dev_register,
912 .dev_disconnect = snd_compress_dev_disconnect,
913 };
914
915 compr->card = card;
916 compr->device = device;
917 compr->direction = dirn;
918 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
919}
920EXPORT_SYMBOL_GPL(snd_compress_new);
921
922static int snd_compress_add_device(struct snd_compr *device)
923{
924 int ret;
925
926 if (!device->card)
927 return -EINVAL;
928
929 /* register the card */
930 ret = snd_card_register(device->card);
931 if (ret)
932 goto out;
933 return 0;
934
935out:
936 pr_err("failed with %d\n", ret);
937 return ret;
938
939}
940
941static int snd_compress_remove_device(struct snd_compr *device)
942{
943 return snd_card_free(device->card);
944}
945
946/**
947 * snd_compress_register - register compressed device
948 *
949 * @device: compressed device to register
950 */
951int snd_compress_register(struct snd_compr *device)
952{
953 int retval;
954
955 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
956 return -EINVAL;
957
958 pr_debug("Registering compressed device %s\n", device->name);
959 if (snd_BUG_ON(!device->ops->open))
960 return -EINVAL;
961 if (snd_BUG_ON(!device->ops->free))
962 return -EINVAL;
963 if (snd_BUG_ON(!device->ops->set_params))
964 return -EINVAL;
965 if (snd_BUG_ON(!device->ops->trigger))
966 return -EINVAL;
967
968 mutex_init(&device->lock);
969
970 /* register a compressed card */
971 mutex_lock(&device_mutex);
972 retval = snd_compress_add_device(device);
973 mutex_unlock(&device_mutex);
974 return retval;
975}
976EXPORT_SYMBOL_GPL(snd_compress_register);
977
978int snd_compress_deregister(struct snd_compr *device)
979{
980 pr_debug("Removing compressed device %s\n", device->name);
981 mutex_lock(&device_mutex);
982 snd_compress_remove_device(device);
983 mutex_unlock(&device_mutex);
984 return 0;
985}
986EXPORT_SYMBOL_GPL(snd_compress_deregister);
987
988static int __init snd_compress_init(void)
989{
990 return 0;
991}
992
993static void __exit snd_compress_exit(void)
994{
995}
996
997module_init(snd_compress_init);
998module_exit(snd_compress_exit);
999
1000MODULE_DESCRIPTION("ALSA Compressed offload framework");
1001MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1002MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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