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ALSA: compress_core: Remove unused hw_pointer
[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);
5b1f79f7
CK		 155 if (stream->direction == SND_COMPRESS_PLAYBACK)
156 stream->runtime->total_bytes_transferred = tstamp->copied_total;
157 else
158 stream->runtime->total_bytes_available = tstamp->copied_total;
17ac8e5c 159 return 0;
b21c60a4
VK		 160}
161
162static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
163 struct snd_compr_avail *avail)
164{
17ac8e5c 165 memset(avail, 0, sizeof(*avail));
b21c60a4 166 snd_compr_update_tstamp(stream, &avail->tstamp);
17ac8e5c 167 /* Still need to return avail even if tstamp can't be filled in */
b21c60a4 168
b21c60a4 169 if (stream->runtime->total_bytes_available == 0 &&
5b1f79f7
CK		 170 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
171 stream->direction == SND_COMPRESS_PLAYBACK) {
b21c60a4
VK		 172 pr_debug("detected init and someone forgot to do a write\n");
173 return stream->runtime->buffer_size;
174 }
175 pr_debug("app wrote %lld, DSP consumed %lld\n",
176 stream->runtime->total_bytes_available,
177 stream->runtime->total_bytes_transferred);
178 if (stream->runtime->total_bytes_available ==
179 stream->runtime->total_bytes_transferred) {
5b1f79f7
CK		 180 if (stream->direction == SND_COMPRESS_PLAYBACK) {
181 pr_debug("both pointers are same, returning full avail\n");
182 return stream->runtime->buffer_size;
183 } else {
184 pr_debug("both pointers are same, returning no avail\n");
185 return 0;
186 }
b21c60a4
VK		 187 }
188
5b1f79f7
CK		 189 avail->avail = stream->runtime->total_bytes_available -
190 stream->runtime->total_bytes_transferred;
191 if (stream->direction == SND_COMPRESS_PLAYBACK)
192 avail->avail = stream->runtime->buffer_size - avail->avail;
193
4c28e32d
CK		 194 pr_debug("ret avail as %lld\n", avail->avail);
195 return avail->avail;
b21c60a4
VK		 196}
197
198static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
199{
200 struct snd_compr_avail avail;
201
202 return snd_compr_calc_avail(stream, &avail);
203}
204
205static int
206snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
207{
208 struct snd_compr_avail ioctl_avail;
209 size_t avail;
210
211 avail = snd_compr_calc_avail(stream, &ioctl_avail);
212 ioctl_avail.avail = avail;
213
214 if (copy_to_user((__u64 __user *)arg,
215 &ioctl_avail, sizeof(ioctl_avail)))
216 return -EFAULT;
217 return 0;
218}
219
220static int snd_compr_write_data(struct snd_compr_stream *stream,
221 const char __user *buf, size_t count)
222{
223 void *dstn;
224 size_t copy;
225 struct snd_compr_runtime *runtime = stream->runtime;
226
227 dstn = runtime->buffer + runtime->app_pointer;
228 pr_debug("copying %ld at %lld\n",
229 (unsigned long)count, runtime->app_pointer);
230 if (count < runtime->buffer_size - runtime->app_pointer) {
231 if (copy_from_user(dstn, buf, count))
232 return -EFAULT;
233 runtime->app_pointer += count;
234 } else {
235 copy = runtime->buffer_size - runtime->app_pointer;
236 if (copy_from_user(dstn, buf, copy))
237 return -EFAULT;
238 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
239 return -EFAULT;
240 runtime->app_pointer = count - copy;
241 }
242 /* if DSP cares, let it know data has been written */
243 if (stream->ops->ack)
244 stream->ops->ack(stream, count);
245 return count;
246}
247
248static ssize_t snd_compr_write(struct file *f, const char __user *buf,
249 size_t count, loff_t *offset)
250{
251 struct snd_compr_file *data = f->private_data;
252 struct snd_compr_stream *stream;
253 size_t avail;
254 int retval;
255
256 if (snd_BUG_ON(!data))
257 return -EFAULT;
258
259 stream = &data->stream;
260 mutex_lock(&stream->device->lock);
261 /* write is allowed when stream is running or has been steup */
262 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
263 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
264 mutex_unlock(&stream->device->lock);
265 return -EBADFD;
266 }
267
268 avail = snd_compr_get_avail(stream);
269 pr_debug("avail returned %ld\n", (unsigned long)avail);
270 /* calculate how much we can write to buffer */
271 if (avail > count)
272 avail = count;
273
4daf891c
CK		 274 if (stream->ops->copy) {
275 char __user* cbuf = (char __user*)buf;
276 retval = stream->ops->copy(stream, cbuf, avail);
277 } else {
b21c60a4 278 retval = snd_compr_write_data(stream, buf, avail);
4daf891c 279 }
b21c60a4
VK		 280 if (retval > 0)
281 stream->runtime->total_bytes_available += retval;
282
283 /* while initiating the stream, write should be called before START
284 * call, so in setup move state */
285 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
286 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
287 pr_debug("stream prepared, Houston we are good to go\n");
288 }
289
290 mutex_unlock(&stream->device->lock);
291 return retval;
292}
293
294
295static ssize_t snd_compr_read(struct file *f, char __user *buf,
296 size_t count, loff_t *offset)
297{
49bb6402
CK		 298 struct snd_compr_file *data = f->private_data;
299 struct snd_compr_stream *stream;
300 size_t avail;
301 int retval;
302
303 if (snd_BUG_ON(!data))
304 return -EFAULT;
305
306 stream = &data->stream;
307 mutex_lock(&stream->device->lock);
308
309 /* read is allowed when stream is running */
310 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
311 retval = -EBADFD;
312 goto out;
313 }
314
315 avail = snd_compr_get_avail(stream);
316 pr_debug("avail returned %ld\n", (unsigned long)avail);
317 /* calculate how much we can read from buffer */
318 if (avail > count)
319 avail = count;
320
321 if (stream->ops->copy) {
322 retval = stream->ops->copy(stream, buf, avail);
323 } else {
324 retval = -ENXIO;
325 goto out;
326 }
327 if (retval > 0)
328 stream->runtime->total_bytes_transferred += retval;
329
330out:
331 mutex_unlock(&stream->device->lock);
332 return retval;
b21c60a4
VK		 333}
334
335static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
336{
337 return -ENXIO;
338}
339
340static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
341{
342 if (stream->direction == SND_COMPRESS_PLAYBACK)
343 return POLLOUT | POLLWRNORM;
344 else
345 return POLLIN | POLLRDNORM;
346}
347
348static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
349{
350 struct snd_compr_file *data = f->private_data;
351 struct snd_compr_stream *stream;
352 size_t avail;
353 int retval = 0;
354
355 if (snd_BUG_ON(!data))
356 return -EFAULT;
357 stream = &data->stream;
358 if (snd_BUG_ON(!stream))
359 return -EFAULT;
360
361 mutex_lock(&stream->device->lock);
362 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
363 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
364 retval = -EBADFD;
365 goto out;
366 }
367 poll_wait(f, &stream->runtime->sleep, wait);
368
369 avail = snd_compr_get_avail(stream);
370 pr_debug("avail is %ld\n", (unsigned long)avail);
371 /* check if we have at least one fragment to fill */
372 switch (stream->runtime->state) {
373 case SNDRV_PCM_STATE_DRAINING:
374 /* stream has been woken up after drain is complete
375 * draining done so set stream state to stopped
376 */
377 retval = snd_compr_get_poll(stream);
378 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
379 break;
380 case SNDRV_PCM_STATE_RUNNING:
381 case SNDRV_PCM_STATE_PREPARED:
382 case SNDRV_PCM_STATE_PAUSED:
383 if (avail >= stream->runtime->fragment_size)
384 retval = snd_compr_get_poll(stream);
385 break;
386 default:
387 if (stream->direction == SND_COMPRESS_PLAYBACK)
388 retval = POLLOUT | POLLWRNORM | POLLERR;
389 else
390 retval = POLLIN | POLLRDNORM | POLLERR;
391 break;
392 }
393out:
394 mutex_unlock(&stream->device->lock);
395 return retval;
396}
397
398static int
399snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
400{
401 int retval;
402 struct snd_compr_caps caps;
403
404 if (!stream->ops->get_caps)
405 return -ENXIO;
406
407 retval = stream->ops->get_caps(stream, &caps);
408 if (retval)
409 goto out;
410 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
411 retval = -EFAULT;
412out:
413 return retval;
414}
415
416static int
417snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
418{
419 int retval;
420 struct snd_compr_codec_caps *caps;
421
422 if (!stream->ops->get_codec_caps)
423 return -ENXIO;
424
425 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
426 if (!caps)
427 return -ENOMEM;
428
429 retval = stream->ops->get_codec_caps(stream, caps);
430 if (retval)
431 goto out;
432 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
433 retval = -EFAULT;
434
435out:
436 kfree(caps);
437 return retval;
438}
439
440/* revisit this with snd_pcm_preallocate_xxx */
441static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
442 struct snd_compr_params *params)
443{
444 unsigned int buffer_size;
445 void *buffer;
446
447 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
448 if (stream->ops->copy) {
449 buffer = NULL;
450 /* if copy is defined the driver will be required to copy
451 * the data from core
452 */
453 } else {
454 buffer = kmalloc(buffer_size, GFP_KERNEL);
455 if (!buffer)
456 return -ENOMEM;
457 }
458 stream->runtime->fragment_size = params->buffer.fragment_size;
459 stream->runtime->fragments = params->buffer.fragments;
460 stream->runtime->buffer = buffer;
461 stream->runtime->buffer_size = buffer_size;
462 return 0;
463}
464
4dc040a0
VK		 465static int snd_compress_check_input(struct snd_compr_params *params)
466{
467 /* first let's check the buffer parameter's */
468 if (params->buffer.fragment_size == 0 ||
469 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
470 return -EINVAL;
471
fb4a9779
VK		 472 /* now codec parameters */
473 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
474 return -EINVAL;
475
476 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
477 return -EINVAL;
478
479 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
480 return -EINVAL;
481
4dc040a0
VK		 482 return 0;
483}
484
b21c60a4
VK		 485static int
486snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
487{
488 struct snd_compr_params *params;
489 int retval;
490
491 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
492 /*
493 * we should allow parameter change only when stream has been
494 * opened not in other cases
495 */
496 params = kmalloc(sizeof(*params), GFP_KERNEL);
497 if (!params)
498 return -ENOMEM;
769fab2a
JJ		 499 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
500 retval = -EFAULT;
501 goto out;
502 }
4dc040a0
VK		 503
504 retval = snd_compress_check_input(params);
505 if (retval)
506 goto out;
507
b21c60a4
VK		 508 retval = snd_compr_allocate_buffer(stream, params);
509 if (retval) {
769fab2a
JJ		 510 retval = -ENOMEM;
511 goto out;
b21c60a4 512 }
4dc040a0 513
b21c60a4
VK		 514 retval = stream->ops->set_params(stream, params);
515 if (retval)
516 goto out;
49bb6402 517
9727b490
JK		 518 stream->metadata_set = false;
519 stream->next_track = false;
49bb6402
CK		 520
521 if (stream->direction == SND_COMPRESS_PLAYBACK)
522 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
523 else
524 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
769fab2a 525 } else {
b21c60a4 526 return -EPERM;
769fab2a 527 }
b21c60a4
VK		 528out:
529 kfree(params);
530 return retval;
531}
532
533static int
534snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
535{
536 struct snd_codec *params;
537 int retval;
538
539 if (!stream->ops->get_params)
540 return -EBADFD;
541
542 params = kmalloc(sizeof(*params), GFP_KERNEL);
543 if (!params)
544 return -ENOMEM;
545 retval = stream->ops->get_params(stream, params);
546 if (retval)
547 goto out;
548 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
549 retval = -EFAULT;
550
551out:
552 kfree(params);
553 return retval;
554}
555
9727b490
JK		 556static int
557snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
558{
559 struct snd_compr_metadata metadata;
560 int retval;
561
562 if (!stream->ops->get_metadata)
563 return -ENXIO;
564
565 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
566 return -EFAULT;
567
568 retval = stream->ops->get_metadata(stream, &metadata);
569 if (retval != 0)
570 return retval;
571
572 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
573 return -EFAULT;
574
575 return 0;
576}
577
578static int
579snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
580{
581 struct snd_compr_metadata metadata;
582 int retval;
583
584 if (!stream->ops->set_metadata)
585 return -ENXIO;
586 /*
587 * we should allow parameter change only when stream has been
588 * opened not in other cases
589 */
590 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
591 return -EFAULT;
592
593 retval = stream->ops->set_metadata(stream, &metadata);
594 stream->metadata_set = true;
595
596 return retval;
597}
598
b21c60a4
VK		 599static inline int
600snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
601{
17ac8e5c
RF		 602 struct snd_compr_tstamp tstamp = {0};
603 int ret;
b21c60a4 604
17ac8e5c
RF		 605 ret = snd_compr_update_tstamp(stream, &tstamp);
606 if (ret == 0)
607 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
608 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
609 return ret;
b21c60a4
VK		 610}
611
612static int snd_compr_pause(struct snd_compr_stream *stream)
613{
614 int retval;
615
616 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
617 return -EPERM;
618 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
6b18f793 619 if (!retval)
b21c60a4 620 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
b21c60a4
VK		 621 return retval;
622}
623
624static int snd_compr_resume(struct snd_compr_stream *stream)
625{
626 int retval;
627
628 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
629 return -EPERM;
630 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
631 if (!retval)
632 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
633 return retval;
634}
635
636static int snd_compr_start(struct snd_compr_stream *stream)
637{
638 int retval;
639
640 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
641 return -EPERM;
642 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
643 if (!retval)
644 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
645 return retval;
646}
647
648static int snd_compr_stop(struct snd_compr_stream *stream)
649{
650 int retval;
651
652 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
653 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
654 return -EPERM;
655 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
656 if (!retval) {
657 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
658 wake_up(&stream->runtime->sleep);
8b21460a
VK		 659 stream->runtime->app_pointer = 0;
660 stream->runtime->total_bytes_available = 0;
661 stream->runtime->total_bytes_transferred = 0;
b21c60a4
VK		 662 }
663 return retval;
664}
665
666static int snd_compr_drain(struct snd_compr_stream *stream)
667{
668 int retval;
669
670 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
671 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
672 return -EPERM;
673 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
674 if (!retval) {
675 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
676 wake_up(&stream->runtime->sleep);
677 }
678 return retval;
679}
680
9727b490
JK		 681static int snd_compr_next_track(struct snd_compr_stream *stream)
682{
683 int retval;
684
685 /* only a running stream can transition to next track */
686 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
687 return -EPERM;
688
689 /* you can signal next track isf this is intended to be a gapless stream
690 * and current track metadata is set
691 */
692 if (stream->metadata_set == false)
693 return -EPERM;
694
695 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
696 if (retval != 0)
697 return retval;
698 stream->metadata_set = false;
699 stream->next_track = true;
700 return 0;
701}
702
703static int snd_compr_partial_drain(struct snd_compr_stream *stream)
704{
705 int retval;
706 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
707 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
708 return -EPERM;
709 /* stream can be drained only when next track has been signalled */
710 if (stream->next_track == false)
711 return -EPERM;
712
713 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
714
715 stream->next_track = false;
716 return retval;
717}
718
b21c60a4
VK		 719static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
720{
721 struct snd_compr_file *data = f->private_data;
722 struct snd_compr_stream *stream;
723 int retval = -ENOTTY;
724
725 if (snd_BUG_ON(!data))
726 return -EFAULT;
727 stream = &data->stream;
728 if (snd_BUG_ON(!stream))
729 return -EFAULT;
730 mutex_lock(&stream->device->lock);
731 switch (_IOC_NR(cmd)) {
732 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
733 put_user(SNDRV_COMPRESS_VERSION,
734 (int __user *)arg) ? -EFAULT : 0;
735 break;
736 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
737 retval = snd_compr_get_caps(stream, arg);
738 break;
739 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
740 retval = snd_compr_get_codec_caps(stream, arg);
741 break;
742 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
743 retval = snd_compr_set_params(stream, arg);
744 break;
745 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
746 retval = snd_compr_get_params(stream, arg);
747 break;
9727b490
JK		 748 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
749 retval = snd_compr_set_metadata(stream, arg);
750 break;
751 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
752 retval = snd_compr_get_metadata(stream, arg);
753 break;
b21c60a4
VK		 754 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
755 retval = snd_compr_tstamp(stream, arg);
756 break;
757 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
758 retval = snd_compr_ioctl_avail(stream, arg);
759 break;
760 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
761 retval = snd_compr_pause(stream);
762 break;
763 case _IOC_NR(SNDRV_COMPRESS_RESUME):
764 retval = snd_compr_resume(stream);
765 break;
766 case _IOC_NR(SNDRV_COMPRESS_START):
767 retval = snd_compr_start(stream);
768 break;
769 case _IOC_NR(SNDRV_COMPRESS_STOP):
770 retval = snd_compr_stop(stream);
771 break;
772 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
773 retval = snd_compr_drain(stream);
774 break;
9727b490
JK		 775 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
776 retval = snd_compr_partial_drain(stream);
777 break;
778 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
779 retval = snd_compr_next_track(stream);
780 break;
781
b21c60a4
VK		 782 }
783 mutex_unlock(&stream->device->lock);
784 return retval;
785}
786
787static const struct file_operations snd_compr_file_ops = {
788 .owner = THIS_MODULE,
789 .open = snd_compr_open,
790 .release = snd_compr_free,
791 .write = snd_compr_write,
792 .read = snd_compr_read,
793 .unlocked_ioctl = snd_compr_ioctl,
794 .mmap = snd_compr_mmap,
795 .poll = snd_compr_poll,
796};
797
798static int snd_compress_dev_register(struct snd_device *device)
799{
800 int ret = -EINVAL;
801 char str[16];
802 struct snd_compr *compr;
803
804 if (snd_BUG_ON(!device || !device->device_data))
805 return -EBADFD;
806 compr = device->device_data;
807
808 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
809 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
810 compr->direction);
811 /* register compressed device */
812 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
813 compr->device, &snd_compr_file_ops, compr, str);
814 if (ret < 0) {
815 pr_err("snd_register_device failed\n %d", ret);
816 return ret;
817 }
818 return ret;
819
820}
821
822static int snd_compress_dev_disconnect(struct snd_device *device)
823{
824 struct snd_compr *compr;
825
826 compr = device->device_data;
827 snd_unregister_device(compr->direction, compr->card, compr->device);
828 return 0;
829}
830
831/*
832 * snd_compress_new: create new compress device
833 * @card: sound card pointer
834 * @device: device number
835 * @dirn: device direction, should be of type enum snd_compr_direction
836 * @compr: compress device pointer
837 */
838int snd_compress_new(struct snd_card *card, int device,
839 int dirn, struct snd_compr *compr)
840{
841 static struct snd_device_ops ops = {
842 .dev_free = NULL,
843 .dev_register = snd_compress_dev_register,
844 .dev_disconnect = snd_compress_dev_disconnect,
845 };
846
847 compr->card = card;
848 compr->device = device;
849 compr->direction = dirn;
850 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
851}
852EXPORT_SYMBOL_GPL(snd_compress_new);
853
854static int snd_compress_add_device(struct snd_compr *device)
855{
856 int ret;
857
858 if (!device->card)
859 return -EINVAL;
860
861 /* register the card */
862 ret = snd_card_register(device->card);
863 if (ret)
864 goto out;
865 return 0;
866
867out:
868 pr_err("failed with %d\n", ret);
869 return ret;
870
871}
872
873static int snd_compress_remove_device(struct snd_compr *device)
874{
875 return snd_card_free(device->card);
876}
877
878/**
879 * snd_compress_register - register compressed device
880 *
881 * @device: compressed device to register
882 */
883int snd_compress_register(struct snd_compr *device)
884{
885 int retval;
886
887 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
888 return -EINVAL;
889
890 pr_debug("Registering compressed device %s\n", device->name);
891 if (snd_BUG_ON(!device->ops->open))
892 return -EINVAL;
893 if (snd_BUG_ON(!device->ops->free))
894 return -EINVAL;
895 if (snd_BUG_ON(!device->ops->set_params))
896 return -EINVAL;
897 if (snd_BUG_ON(!device->ops->trigger))
898 return -EINVAL;
899
900 mutex_init(&device->lock);
901
902 /* register a compressed card */
903 mutex_lock(&device_mutex);
904 retval = snd_compress_add_device(device);
905 mutex_unlock(&device_mutex);
906 return retval;
907}
908EXPORT_SYMBOL_GPL(snd_compress_register);
909
910int snd_compress_deregister(struct snd_compr *device)
911{
912 pr_debug("Removing compressed device %s\n", device->name);
913 mutex_lock(&device_mutex);
914 snd_compress_remove_device(device);
915 mutex_unlock(&device_mutex);
916 return 0;
917}
918EXPORT_SYMBOL_GPL(snd_compress_deregister);
919
920static int __init snd_compress_init(void)
921{
922 return 0;
923}
924
925static void __exit snd_compress_exit(void)
926{
927}
928
929module_init(snd_compress_init);
930module_exit(snd_compress_exit);
931
932MODULE_DESCRIPTION("ALSA Compressed offload framework");
933MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
934MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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