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Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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>
c1036889 41#include <linux/compat.h>
b21c60a4
VK		 42#include <sound/core.h>
43#include <sound/initval.h>
31742724 44#include <sound/info.h>
b21c60a4
VK		 45#include <sound/compress_params.h>
46#include <sound/compress_offload.h>
47#include <sound/compress_driver.h>
48
49/* TODO:
50 * - add substream support for multiple devices in case of
51 * SND_DYNAMIC_MINORS is not used
52 * - Multiple node representation
53 * driver should be able to register multiple nodes
54 */
55
56static DEFINE_MUTEX(device_mutex);
57
58struct snd_compr_file {
59 unsigned long caps;
60 struct snd_compr_stream stream;
61};
62
63/*
64 * a note on stream states used:
65 * we use follwing states in the compressed core
66 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
67 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
68 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
69 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
70 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
71 * decoding/encoding and rendering/capturing data.
72 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
73 * by calling SNDRV_COMPRESS_DRAIN.
74 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
75 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
76 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
77 */
78static int snd_compr_open(struct inode *inode, struct file *f)
79{
80 struct snd_compr *compr;
81 struct snd_compr_file *data;
82 struct snd_compr_runtime *runtime;
83 enum snd_compr_direction dirn;
84 int maj = imajor(inode);
85 int ret;
86
81cb3246 87 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
b21c60a4 88 dirn = SND_COMPRESS_PLAYBACK;
81cb3246 89 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
b21c60a4 90 dirn = SND_COMPRESS_CAPTURE;
81cb3246 91 else
b21c60a4 92 return -EINVAL;
b21c60a4
VK		 93
94 if (maj == snd_major)
95 compr = snd_lookup_minor_data(iminor(inode),
96 SNDRV_DEVICE_TYPE_COMPRESS);
97 else
98 return -EBADFD;
99
100 if (compr == NULL) {
101 pr_err("no device data!!!\n");
102 return -ENODEV;
103 }
104
105 if (dirn != compr->direction) {
106 pr_err("this device doesn't support this direction\n");
a0830dbd 107 snd_card_unref(compr->card);
b21c60a4
VK		 108 return -EINVAL;
109 }
110
111 data = kzalloc(sizeof(*data), GFP_KERNEL);
a0830dbd
TI		 112 if (!data) {
113 snd_card_unref(compr->card);
b21c60a4 114 return -ENOMEM;
a0830dbd 115 }
b21c60a4
VK		 116 data->stream.ops = compr->ops;
117 data->stream.direction = dirn;
118 data->stream.private_data = compr->private_data;
119 data->stream.device = compr;
120 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
121 if (!runtime) {
122 kfree(data);
a0830dbd 123 snd_card_unref(compr->card);
b21c60a4
VK		 124 return -ENOMEM;
125 }
126 runtime->state = SNDRV_PCM_STATE_OPEN;
127 init_waitqueue_head(&runtime->sleep);
128 data->stream.runtime = runtime;
129 f->private_data = (void *)data;
130 mutex_lock(&compr->lock);
131 ret = compr->ops->open(&data->stream);
132 mutex_unlock(&compr->lock);
133 if (ret) {
134 kfree(runtime);
135 kfree(data);
136 }
a0830dbd 137 snd_card_unref(compr->card);
749d3223 138 return ret;
b21c60a4
VK		 139}
140
141static int snd_compr_free(struct inode *inode, struct file *f)
142{
143 struct snd_compr_file *data = f->private_data;
b26d19e4
LG		 144 struct snd_compr_runtime *runtime = data->stream.runtime;
145
146 switch (runtime->state) {
147 case SNDRV_PCM_STATE_RUNNING:
148 case SNDRV_PCM_STATE_DRAINING:
149 case SNDRV_PCM_STATE_PAUSED:
150 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
151 break;
152 default:
153 break;
154 }
155
b21c60a4
VK		 156 data->stream.ops->free(&data->stream);
157 kfree(data->stream.runtime->buffer);
158 kfree(data->stream.runtime);
159 kfree(data);
160 return 0;
161}
162
17ac8e5c 163static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
b21c60a4
VK		 164 struct snd_compr_tstamp *tstamp)
165{
166 if (!stream->ops->pointer)
17ac8e5c 167 return -ENOTSUPP;
b21c60a4
VK		 168 stream->ops->pointer(stream, tstamp);
169 pr_debug("dsp consumed till %d total %d bytes\n",
170 tstamp->byte_offset, tstamp->copied_total);
5b1f79f7
CK		 171 if (stream->direction == SND_COMPRESS_PLAYBACK)
172 stream->runtime->total_bytes_transferred = tstamp->copied_total;
173 else
174 stream->runtime->total_bytes_available = tstamp->copied_total;
17ac8e5c 175 return 0;
b21c60a4
VK		 176}
177
178static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
179 struct snd_compr_avail *avail)
180{
17ac8e5c 181 memset(avail, 0, sizeof(*avail));
b21c60a4 182 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 183 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4 184
b21c60a4 185 if (stream->runtime->total_bytes_available == 0 &&
5b1f79f7
CK		 186 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
187 stream->direction == SND_COMPRESS_PLAYBACK) {
b21c60a4
VK		 188 pr_debug("detected init and someone forgot to do a write\n");
189 return stream->runtime->buffer_size;
190 }
191 pr_debug("app wrote %lld, DSP consumed %lld\n",
192 stream->runtime->total_bytes_available,
193 stream->runtime->total_bytes_transferred);
194 if (stream->runtime->total_bytes_available ==
195 stream->runtime->total_bytes_transferred) {
5b1f79f7
CK		 196 if (stream->direction == SND_COMPRESS_PLAYBACK) {
197 pr_debug("both pointers are same, returning full avail\n");
198 return stream->runtime->buffer_size;
199 } else {
200 pr_debug("both pointers are same, returning no avail\n");
201 return 0;
202 }
b21c60a4
VK		 203 }
204
5b1f79f7
CK		 205 avail->avail = stream->runtime->total_bytes_available -
206 stream->runtime->total_bytes_transferred;
207 if (stream->direction == SND_COMPRESS_PLAYBACK)
208 avail->avail = stream->runtime->buffer_size - avail->avail;
209
4c28e32d
CK		 210 pr_debug("ret avail as %lld\n", avail->avail);
211 return avail->avail;
b21c60a4
VK		 212}
213
214static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
215{
216 struct snd_compr_avail avail;
217
218 return snd_compr_calc_avail(stream, &avail);
219}
220
221static int
222snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
223{
224 struct snd_compr_avail ioctl_avail;
225 size_t avail;
226
227 avail = snd_compr_calc_avail(stream, &ioctl_avail);
228 ioctl_avail.avail = avail;
229
230 if (copy_to_user((__u64 __user *)arg,
231 &ioctl_avail, sizeof(ioctl_avail)))
232 return -EFAULT;
233 return 0;
234}
235
236static int snd_compr_write_data(struct snd_compr_stream *stream,
237 const char __user *buf, size_t count)
238{
239 void *dstn;
240 size_t copy;
241 struct snd_compr_runtime *runtime = stream->runtime;
f0283b58
CK		 242 /* 64-bit Modulus */
243 u64 app_pointer = div64_u64(runtime->total_bytes_available,
244 runtime->buffer_size);
245 app_pointer = runtime->total_bytes_available -
246 (app_pointer * runtime->buffer_size);
b21c60a4 247
f0283b58 248 dstn = runtime->buffer + app_pointer;
b21c60a4 249 pr_debug("copying %ld at %lld\n",
f0283b58
CK		 250 (unsigned long)count, app_pointer);
251 if (count < runtime->buffer_size - app_pointer) {
b21c60a4
VK		 252 if (copy_from_user(dstn, buf, count))
253 return -EFAULT;
b21c60a4 254 } else {
f0283b58 255 copy = runtime->buffer_size - app_pointer;
b21c60a4
VK		 256 if (copy_from_user(dstn, buf, copy))
257 return -EFAULT;
258 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
259 return -EFAULT;
b21c60a4
VK		 260 }
261 /* if DSP cares, let it know data has been written */
262 if (stream->ops->ack)
263 stream->ops->ack(stream, count);
264 return count;
265}
266
267static ssize_t snd_compr_write(struct file *f, const char __user *buf,
268 size_t count, loff_t *offset)
269{
270 struct snd_compr_file *data = f->private_data;
271 struct snd_compr_stream *stream;
272 size_t avail;
273 int retval;
274
275 if (snd_BUG_ON(!data))
276 return -EFAULT;
277
278 stream = &data->stream;
279 mutex_lock(&stream->device->lock);
280 /* write is allowed when stream is running or has been steup */
281 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
282 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
283 mutex_unlock(&stream->device->lock);
284 return -EBADFD;
285 }
286
287 avail = snd_compr_get_avail(stream);
288 pr_debug("avail returned %ld\n", (unsigned long)avail);
289 /* calculate how much we can write to buffer */
290 if (avail > count)
291 avail = count;
292
4daf891c
CK		 293 if (stream->ops->copy) {
294 char __user* cbuf = (char __user*)buf;
295 retval = stream->ops->copy(stream, cbuf, avail);
296 } else {
b21c60a4 297 retval = snd_compr_write_data(stream, buf, avail);
4daf891c 298 }
b21c60a4
VK		 299 if (retval > 0)
300 stream->runtime->total_bytes_available += retval;
301
302 /* while initiating the stream, write should be called before START
303 * call, so in setup move state */
304 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
305 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
306 pr_debug("stream prepared, Houston we are good to go\n");
307 }
308
309 mutex_unlock(&stream->device->lock);
310 return retval;
311}
312
313
314static ssize_t snd_compr_read(struct file *f, char __user *buf,
315 size_t count, loff_t *offset)
316{
49bb6402
CK		 317 struct snd_compr_file *data = f->private_data;
318 struct snd_compr_stream *stream;
319 size_t avail;
320 int retval;
321
322 if (snd_BUG_ON(!data))
323 return -EFAULT;
324
325 stream = &data->stream;
326 mutex_lock(&stream->device->lock);
327
75481347
VK		 328 /* read is allowed when stream is running, paused, draining and setup
329 * (yes setup is state which we transition to after stop, so if user
330 * wants to read data after stop we allow that)
331 */
332 switch (stream->runtime->state) {
333 case SNDRV_PCM_STATE_OPEN:
334 case SNDRV_PCM_STATE_PREPARED:
335 case SNDRV_PCM_STATE_XRUN:
336 case SNDRV_PCM_STATE_SUSPENDED:
337 case SNDRV_PCM_STATE_DISCONNECTED:
49bb6402
CK		 338 retval = -EBADFD;
339 goto out;
340 }
341
342 avail = snd_compr_get_avail(stream);
343 pr_debug("avail returned %ld\n", (unsigned long)avail);
344 /* calculate how much we can read from buffer */
345 if (avail > count)
346 avail = count;
347
348 if (stream->ops->copy) {
349 retval = stream->ops->copy(stream, buf, avail);
350 } else {
351 retval = -ENXIO;
352 goto out;
353 }
354 if (retval > 0)
355 stream->runtime->total_bytes_transferred += retval;
356
357out:
358 mutex_unlock(&stream->device->lock);
359 return retval;
b21c60a4
VK		 360}
361
362static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
363{
364 return -ENXIO;
365}
366
367static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
368{
369 if (stream->direction == SND_COMPRESS_PLAYBACK)
370 return POLLOUT | POLLWRNORM;
371 else
372 return POLLIN | POLLRDNORM;
373}
374
375static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
376{
377 struct snd_compr_file *data = f->private_data;
378 struct snd_compr_stream *stream;
379 size_t avail;
380 int retval = 0;
381
382 if (snd_BUG_ON(!data))
383 return -EFAULT;
384 stream = &data->stream;
385 if (snd_BUG_ON(!stream))
386 return -EFAULT;
387
388 mutex_lock(&stream->device->lock);
c15b149a 389 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
b21c60a4
VK		 390 retval = -EBADFD;
391 goto out;
392 }
393 poll_wait(f, &stream->runtime->sleep, wait);
394
395 avail = snd_compr_get_avail(stream);
396 pr_debug("avail is %ld\n", (unsigned long)avail);
397 /* check if we have at least one fragment to fill */
398 switch (stream->runtime->state) {
399 case SNDRV_PCM_STATE_DRAINING:
400 /* stream has been woken up after drain is complete
401 * draining done so set stream state to stopped
402 */
403 retval = snd_compr_get_poll(stream);
404 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
405 break;
406 case SNDRV_PCM_STATE_RUNNING:
407 case SNDRV_PCM_STATE_PREPARED:
408 case SNDRV_PCM_STATE_PAUSED:
409 if (avail >= stream->runtime->fragment_size)
410 retval = snd_compr_get_poll(stream);
411 break;
412 default:
413 if (stream->direction == SND_COMPRESS_PLAYBACK)
414 retval = POLLOUT | POLLWRNORM | POLLERR;
415 else
416 retval = POLLIN | POLLRDNORM | POLLERR;
417 break;
418 }
419out:
420 mutex_unlock(&stream->device->lock);
421 return retval;
422}
423
424static int
425snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
426{
427 int retval;
428 struct snd_compr_caps caps;
429
430 if (!stream->ops->get_caps)
431 return -ENXIO;
432
1c62e9f2 433 memset(&caps, 0, sizeof(caps));
b21c60a4
VK		 434 retval = stream->ops->get_caps(stream, &caps);
435 if (retval)
436 goto out;
437 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
438 retval = -EFAULT;
439out:
440 return retval;
441}
442
443static int
444snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
445{
446 int retval;
447 struct snd_compr_codec_caps *caps;
448
449 if (!stream->ops->get_codec_caps)
450 return -ENXIO;
451
47966e97 452 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
b21c60a4
VK		 453 if (!caps)
454 return -ENOMEM;
455
456 retval = stream->ops->get_codec_caps(stream, caps);
457 if (retval)
458 goto out;
459 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
460 retval = -EFAULT;
461
462out:
463 kfree(caps);
464 return retval;
465}
466
467/* revisit this with snd_pcm_preallocate_xxx */
468static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
469 struct snd_compr_params *params)
470{
471 unsigned int buffer_size;
472 void *buffer;
473
474 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
475 if (stream->ops->copy) {
476 buffer = NULL;
477 /* if copy is defined the driver will be required to copy
478 * the data from core
479 */
480 } else {
481 buffer = kmalloc(buffer_size, GFP_KERNEL);
482 if (!buffer)
483 return -ENOMEM;
484 }
485 stream->runtime->fragment_size = params->buffer.fragment_size;
486 stream->runtime->fragments = params->buffer.fragments;
487 stream->runtime->buffer = buffer;
488 stream->runtime->buffer_size = buffer_size;
489 return 0;
490}
491
4dc040a0
VK		 492static int snd_compress_check_input(struct snd_compr_params *params)
493{
494 /* first let's check the buffer parameter's */
495 if (params->buffer.fragment_size == 0 ||
6217e5ed 496 params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
4dc040a0
VK		 497 return -EINVAL;
498
fb4a9779
VK		 499 /* now codec parameters */
500 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
501 return -EINVAL;
502
503 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
504 return -EINVAL;
fb4a9779 505
4dc040a0
VK		 506 return 0;
507}
508
b21c60a4
VK		 509static int
510snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
511{
512 struct snd_compr_params *params;
513 int retval;
514
515 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
516 /*
517 * we should allow parameter change only when stream has been
518 * opened not in other cases
519 */
520 params = kmalloc(sizeof(*params), GFP_KERNEL);
521 if (!params)
522 return -ENOMEM;
769fab2a
JJ		 523 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
524 retval = -EFAULT;
525 goto out;
526 }
4dc040a0
VK		 527
528 retval = snd_compress_check_input(params);
529 if (retval)
530 goto out;
531
b21c60a4
VK		 532 retval = snd_compr_allocate_buffer(stream, params);
533 if (retval) {
769fab2a
JJ		 534 retval = -ENOMEM;
535 goto out;
b21c60a4 536 }
4dc040a0 537
b21c60a4
VK		 538 retval = stream->ops->set_params(stream, params);
539 if (retval)
540 goto out;
49bb6402 541
9727b490
JK		 542 stream->metadata_set = false;
543 stream->next_track = false;
49bb6402
CK		 544
545 if (stream->direction == SND_COMPRESS_PLAYBACK)
546 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
547 else
548 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
769fab2a 549 } else {
b21c60a4 550 return -EPERM;
769fab2a 551 }
b21c60a4
VK		 552out:
553 kfree(params);
554 return retval;
555}
556
557static int
558snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
559{
560 struct snd_codec *params;
561 int retval;
562
563 if (!stream->ops->get_params)
564 return -EBADFD;
565
47966e97 566 params = kzalloc(sizeof(*params), GFP_KERNEL);
b21c60a4
VK		 567 if (!params)
568 return -ENOMEM;
569 retval = stream->ops->get_params(stream, params);
570 if (retval)
571 goto out;
572 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
573 retval = -EFAULT;
574
575out:
576 kfree(params);
577 return retval;
578}
579
9727b490
JK		 580static int
581snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
582{
583 struct snd_compr_metadata metadata;
584 int retval;
585
586 if (!stream->ops->get_metadata)
587 return -ENXIO;
588
589 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
590 return -EFAULT;
591
592 retval = stream->ops->get_metadata(stream, &metadata);
593 if (retval != 0)
594 return retval;
595
596 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
597 return -EFAULT;
598
599 return 0;
600}
601
602static int
603snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
604{
605 struct snd_compr_metadata metadata;
606 int retval;
607
608 if (!stream->ops->set_metadata)
609 return -ENXIO;
610 /*
611 * we should allow parameter change only when stream has been
612 * opened not in other cases
613 */
614 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
615 return -EFAULT;
616
617 retval = stream->ops->set_metadata(stream, &metadata);
618 stream->metadata_set = true;
619
620 return retval;
621}
622
b21c60a4
VK		 623static inline int
624snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
625{
17ac8e5c
RF		 626 struct snd_compr_tstamp tstamp = {0};
627 int ret;
b21c60a4 628
17ac8e5c
RF		 629 ret = snd_compr_update_tstamp(stream, &tstamp);
630 if (ret == 0)
631 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
632 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
633 return ret;
b21c60a4
VK		 634}
635
636static int snd_compr_pause(struct snd_compr_stream *stream)
637{
638 int retval;
639
640 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
641 return -EPERM;
642 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 643 if (!retval)
b21c60a4 644 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 645 return retval;
646}
647
648static int snd_compr_resume(struct snd_compr_stream *stream)
649{
650 int retval;
651
652 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
653 return -EPERM;
654 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
655 if (!retval)
656 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
657 return retval;
658}
659
660static int snd_compr_start(struct snd_compr_stream *stream)
661{
662 int retval;
663
664 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
665 return -EPERM;
666 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
667 if (!retval)
668 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
669 return retval;
670}
671
672static int snd_compr_stop(struct snd_compr_stream *stream)
673{
674 int retval;
675
676 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
677 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
678 return -EPERM;
679 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
680 if (!retval) {
917f4b5c 681 snd_compr_drain_notify(stream);
8b21460a
VK		 682 stream->runtime->total_bytes_available = 0;
683 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 684 }
685 return retval;
686}
687
917f4b5c
VK		 688static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
689{
f44f2a54
VK		 690 int ret;
691
917f4b5c
VK		 692 /*
693 * We are called with lock held. So drop the lock while we wait for
694 * drain complete notfication from the driver
695 *
696 * It is expected that driver will notify the drain completion and then
697 * stream will be moved to SETUP state, even if draining resulted in an
698 * error. We can trigger next track after this.
699 */
700 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
701 mutex_unlock(&stream->device->lock);
702
f44f2a54
VK		 703 /* we wait for drain to complete here, drain can return when
704 * interruption occurred, wait returned error or success.
705 * For the first two cases we don't do anything different here and
706 * return after waking up
707 */
708
709 ret = wait_event_interruptible(stream->runtime->sleep,
710 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
711 if (ret == -ERESTARTSYS)
712 pr_debug("wait aborted by a signal");
713 else if (ret)
714 pr_debug("wait for drain failed with %d\n", ret);
715
917f4b5c
VK		 716
717 wake_up(&stream->runtime->sleep);
718 mutex_lock(&stream->device->lock);
719
f44f2a54 720 return ret;
917f4b5c
VK		 721}
722
b21c60a4
VK		 723static int snd_compr_drain(struct snd_compr_stream *stream)
724{
725 int retval;
726
727 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
728 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
729 return -EPERM;
917f4b5c 730
b21c60a4 731 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
917f4b5c 732 if (retval) {
f44f2a54 733 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
b21c60a4 734 wake_up(&stream->runtime->sleep);
917f4b5c 735 return retval;
b21c60a4 736 }
917f4b5c 737
f44f2a54 738 return snd_compress_wait_for_drain(stream);
b21c60a4
VK		 739}
740
9727b490
JK		 741static int snd_compr_next_track(struct snd_compr_stream *stream)
742{
743 int retval;
744
745 /* only a running stream can transition to next track */
746 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
747 return -EPERM;
748
749 /* you can signal next track isf this is intended to be a gapless stream
750 * and current track metadata is set
751 */
752 if (stream->metadata_set == false)
753 return -EPERM;
754
755 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
756 if (retval != 0)
757 return retval;
758 stream->metadata_set = false;
759 stream->next_track = true;
760 return 0;
761}
762
763static int snd_compr_partial_drain(struct snd_compr_stream *stream)
764{
765 int retval;
766 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
767 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
768 return -EPERM;
769 /* stream can be drained only when next track has been signalled */
770 if (stream->next_track == false)
771 return -EPERM;
772
773 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
917f4b5c 774 if (retval) {
f44f2a54 775 pr_debug("Partial drain returned failure\n");
917f4b5c
VK		 776 wake_up(&stream->runtime->sleep);
777 return retval;
778 }
9727b490
JK		 779
780 stream->next_track = false;
917f4b5c 781 return snd_compress_wait_for_drain(stream);
9727b490
JK		 782}
783
b21c60a4
VK		 784static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
785{
786 struct snd_compr_file *data = f->private_data;
787 struct snd_compr_stream *stream;
788 int retval = -ENOTTY;
789
790 if (snd_BUG_ON(!data))
791 return -EFAULT;
792 stream = &data->stream;
793 if (snd_BUG_ON(!stream))
794 return -EFAULT;
795 mutex_lock(&stream->device->lock);
796 switch (_IOC_NR(cmd)) {
797 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
a8d30608 798 retval = put_user(SNDRV_COMPRESS_VERSION,
b21c60a4
VK		 799 (int __user *)arg) ? -EFAULT : 0;
800 break;
801 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
802 retval = snd_compr_get_caps(stream, arg);
803 break;
804 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
805 retval = snd_compr_get_codec_caps(stream, arg);
806 break;
807 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
808 retval = snd_compr_set_params(stream, arg);
809 break;
810 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
811 retval = snd_compr_get_params(stream, arg);
812 break;
9727b490
JK		 813 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
814 retval = snd_compr_set_metadata(stream, arg);
815 break;
816 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
817 retval = snd_compr_get_metadata(stream, arg);
818 break;
b21c60a4
VK		 819 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
820 retval = snd_compr_tstamp(stream, arg);
821 break;
822 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
823 retval = snd_compr_ioctl_avail(stream, arg);
824 break;
825 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
826 retval = snd_compr_pause(stream);
827 break;
828 case _IOC_NR(SNDRV_COMPRESS_RESUME):
829 retval = snd_compr_resume(stream);
830 break;
831 case _IOC_NR(SNDRV_COMPRESS_START):
832 retval = snd_compr_start(stream);
833 break;
834 case _IOC_NR(SNDRV_COMPRESS_STOP):
835 retval = snd_compr_stop(stream);
836 break;
837 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
838 retval = snd_compr_drain(stream);
839 break;
9727b490
JK		 840 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
841 retval = snd_compr_partial_drain(stream);
842 break;
843 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
844 retval = snd_compr_next_track(stream);
845 break;
846
b21c60a4
VK		 847 }
848 mutex_unlock(&stream->device->lock);
849 return retval;
850}
851
c1036889
RL		 852/* support of 32bit userspace on 64bit platforms */
853#ifdef CONFIG_COMPAT
854static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
855 unsigned long arg)
856{
857 return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
858}
859#endif
860
b21c60a4
VK		 861static const struct file_operations snd_compr_file_ops = {
862 .owner = THIS_MODULE,
863 .open = snd_compr_open,
864 .release = snd_compr_free,
865 .write = snd_compr_write,
866 .read = snd_compr_read,
867 .unlocked_ioctl = snd_compr_ioctl,
c1036889
RL		 868#ifdef CONFIG_COMPAT
869 .compat_ioctl = snd_compr_ioctl_compat,
870#endif
b21c60a4
VK		 871 .mmap = snd_compr_mmap,
872 .poll = snd_compr_poll,
873};
874
875static int snd_compress_dev_register(struct snd_device *device)
876{
877 int ret = -EINVAL;
878 char str[16];
879 struct snd_compr *compr;
880
881 if (snd_BUG_ON(!device || !device->device_data))
882 return -EBADFD;
883 compr = device->device_data;
884
b21c60a4
VK		 885 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
886 compr->direction);
887 /* register compressed device */
40a4b263
TI		 888 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
889 compr->card, compr->device,
890 &snd_compr_file_ops, compr, &compr->dev);
b21c60a4
VK		 891 if (ret < 0) {
892 pr_err("snd_register_device failed\n %d", ret);
893 return ret;
894 }
895 return ret;
896
897}
898
899static int snd_compress_dev_disconnect(struct snd_device *device)
900{
901 struct snd_compr *compr;
902
903 compr = device->device_data;
40a4b263 904 snd_unregister_device(&compr->dev);
b21c60a4
VK		 905 return 0;
906}
907
31742724
RF		 908#ifdef CONFIG_SND_VERBOSE_PROCFS
909static void snd_compress_proc_info_read(struct snd_info_entry *entry,
910 struct snd_info_buffer *buffer)
911{
912 struct snd_compr *compr = (struct snd_compr *)entry->private_data;
913
914 snd_iprintf(buffer, "card: %d\n", compr->card->number);
915 snd_iprintf(buffer, "device: %d\n", compr->device);
916 snd_iprintf(buffer, "stream: %s\n",
917 compr->direction == SND_COMPRESS_PLAYBACK
918 ? "PLAYBACK" : "CAPTURE");
919 snd_iprintf(buffer, "id: %s\n", compr->id);
920}
921
922static int snd_compress_proc_init(struct snd_compr *compr)
923{
924 struct snd_info_entry *entry;
925 char name[16];
926
927 sprintf(name, "compr%i", compr->device);
928 entry = snd_info_create_card_entry(compr->card, name,
929 compr->card->proc_root);
930 if (!entry)
931 return -ENOMEM;
932 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
933 if (snd_info_register(entry) < 0) {
934 snd_info_free_entry(entry);
935 return -ENOMEM;
936 }
937 compr->proc_root = entry;
938
939 entry = snd_info_create_card_entry(compr->card, "info",
940 compr->proc_root);
941 if (entry) {
942 snd_info_set_text_ops(entry, compr,
943 snd_compress_proc_info_read);
944 if (snd_info_register(entry) < 0) {
945 snd_info_free_entry(entry);
946 entry = NULL;
947 }
948 }
949 compr->proc_info_entry = entry;
950
951 return 0;
952}
953
954static void snd_compress_proc_done(struct snd_compr *compr)
955{
956 snd_info_free_entry(compr->proc_info_entry);
957 compr->proc_info_entry = NULL;
958 snd_info_free_entry(compr->proc_root);
959 compr->proc_root = NULL;
960}
e5241a8c
RF		 961
962static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
963{
964 strlcpy(compr->id, id, sizeof(compr->id));
965}
31742724
RF		 966#else
967static inline int snd_compress_proc_init(struct snd_compr *compr)
968{
969 return 0;
970}
971
972static inline void snd_compress_proc_done(struct snd_compr *compr)
973{
974}
e5241a8c
RF		 975
976static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
977{
978}
31742724
RF		 979#endif
980
04c5d5a4
TI		 981static int snd_compress_dev_free(struct snd_device *device)
982{
983 struct snd_compr *compr;
984
985 compr = device->device_data;
31742724 986 snd_compress_proc_done(compr);
04c5d5a4
TI		 987 put_device(&compr->dev);
988 return 0;
989}
990
b21c60a4
VK		 991/*
992 * snd_compress_new: create new compress device
993 * @card: sound card pointer
994 * @device: device number
995 * @dirn: device direction, should be of type enum snd_compr_direction
996 * @compr: compress device pointer
997 */
998int snd_compress_new(struct snd_card *card, int device,
e5241a8c 999 int dirn, const char *id, struct snd_compr *compr)
b21c60a4
VK		 1000{
1001 static struct snd_device_ops ops = {
04c5d5a4 1002 .dev_free = snd_compress_dev_free,
b21c60a4
VK		 1003 .dev_register = snd_compress_dev_register,
1004 .dev_disconnect = snd_compress_dev_disconnect,
1005 };
31742724 1006 int ret;
b21c60a4
VK		 1007
1008 compr->card = card;
1009 compr->device = device;
1010 compr->direction = dirn;
04c5d5a4 1011
e5241a8c
RF		 1012 snd_compress_set_id(compr, id);
1013
04c5d5a4
TI		 1014 snd_device_initialize(&compr->dev, card);
1015 dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1016
31742724
RF		 1017 ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1018 if (ret == 0)
1019 snd_compress_proc_init(compr);
1020
1021 return ret;
b21c60a4
VK		 1022}
1023EXPORT_SYMBOL_GPL(snd_compress_new);
1024
1025static int snd_compress_add_device(struct snd_compr *device)
1026{
1027 int ret;
1028
1029 if (!device->card)
1030 return -EINVAL;
1031
1032 /* register the card */
1033 ret = snd_card_register(device->card);
1034 if (ret)
1035 goto out;
1036 return 0;
1037
1038out:
1039 pr_err("failed with %d\n", ret);
1040 return ret;
1041
1042}
1043
1044static int snd_compress_remove_device(struct snd_compr *device)
1045{
1046 return snd_card_free(device->card);
1047}
1048
1049/**
1050 * snd_compress_register - register compressed device
1051 *
1052 * @device: compressed device to register
1053 */
1054int snd_compress_register(struct snd_compr *device)
1055{
1056 int retval;
1057
04c5d5a4 1058 if (device->name == NULL || device->ops == NULL)
b21c60a4
VK		 1059 return -EINVAL;
1060
1061 pr_debug("Registering compressed device %s\n", device->name);
1062 if (snd_BUG_ON(!device->ops->open))
1063 return -EINVAL;
1064 if (snd_BUG_ON(!device->ops->free))
1065 return -EINVAL;
1066 if (snd_BUG_ON(!device->ops->set_params))
1067 return -EINVAL;
1068 if (snd_BUG_ON(!device->ops->trigger))
1069 return -EINVAL;
1070
1071 mutex_init(&device->lock);
1072
1073 /* register a compressed card */
1074 mutex_lock(&device_mutex);
1075 retval = snd_compress_add_device(device);
1076 mutex_unlock(&device_mutex);
1077 return retval;
1078}
1079EXPORT_SYMBOL_GPL(snd_compress_register);
1080
1081int snd_compress_deregister(struct snd_compr *device)
1082{
1083 pr_debug("Removing compressed device %s\n", device->name);
1084 mutex_lock(&device_mutex);
1085 snd_compress_remove_device(device);
1086 mutex_unlock(&device_mutex);
1087 return 0;
1088}
1089EXPORT_SYMBOL_GPL(snd_compress_deregister);
1090
1091static int __init snd_compress_init(void)
1092{
1093 return 0;
1094}
1095
1096static void __exit snd_compress_exit(void)
1097{
1098}
1099
1100module_init(snd_compress_init);
1101module_exit(snd_compress_exit);
1102
1103MODULE_DESCRIPTION("ALSA Compressed offload framework");
1104MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1105MODULE_LICENSE("GPL v2");