2 * compress_core.c - compress offload core
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
28 #include <linux/file.h>
30 #include <linux/list.h>
31 #include <linux/math64.h>
33 #include <linux/mutex.h>
34 #include <linux/poll.h>
35 #include <linux/slab.h>
36 #include <linux/sched.h>
37 #include <linux/types.h>
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>
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
54 static DEFINE_MUTEX(device_mutex
);
56 struct snd_compr_file
{
58 struct snd_compr_stream stream
;
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.
76 static int snd_compr_open(struct inode
*inode
, struct file
*f
)
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
);
85 if ((f
->f_flags
& O_ACCMODE
) == O_WRONLY
)
86 dirn
= SND_COMPRESS_PLAYBACK
;
87 else if ((f
->f_flags
& O_ACCMODE
) == O_RDONLY
)
88 dirn
= SND_COMPRESS_CAPTURE
;
93 compr
= snd_lookup_minor_data(iminor(inode
),
94 SNDRV_DEVICE_TYPE_COMPRESS
);
99 pr_err("no device data!!!\n");
103 if (dirn
!= compr
->direction
) {
104 pr_err("this device doesn't support this direction\n");
105 snd_card_unref(compr
->card
);
109 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
111 snd_card_unref(compr
->card
);
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
);
121 snd_card_unref(compr
->card
);
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
);
135 snd_card_unref(compr
->card
);
139 static int snd_compr_free(struct inode
*inode
, struct file
*f
)
141 struct snd_compr_file
*data
= f
->private_data
;
142 struct snd_compr_runtime
*runtime
= data
->stream
.runtime
;
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
);
154 data
->stream
.ops
->free(&data
->stream
);
155 kfree(data
->stream
.runtime
->buffer
);
156 kfree(data
->stream
.runtime
);
161 static int snd_compr_update_tstamp(struct snd_compr_stream
*stream
,
162 struct snd_compr_tstamp
*tstamp
)
164 if (!stream
->ops
->pointer
)
166 stream
->ops
->pointer(stream
, tstamp
);
167 pr_debug("dsp consumed till %d total %d bytes\n",
168 tstamp
->byte_offset
, tstamp
->copied_total
);
169 if (stream
->direction
== SND_COMPRESS_PLAYBACK
)
170 stream
->runtime
->total_bytes_transferred
= tstamp
->copied_total
;
172 stream
->runtime
->total_bytes_available
= tstamp
->copied_total
;
176 static size_t snd_compr_calc_avail(struct snd_compr_stream
*stream
,
177 struct snd_compr_avail
*avail
)
179 memset(avail
, 0, sizeof(*avail
));
180 snd_compr_update_tstamp(stream
, &avail
->tstamp
);
181 /* Still need to return avail even if tstamp can't be filled in */
183 if (stream
->runtime
->total_bytes_available
== 0 &&
184 stream
->runtime
->state
== SNDRV_PCM_STATE_SETUP
&&
185 stream
->direction
== SND_COMPRESS_PLAYBACK
) {
186 pr_debug("detected init and someone forgot to do a write\n");
187 return stream
->runtime
->buffer_size
;
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
) {
194 if (stream
->direction
== SND_COMPRESS_PLAYBACK
) {
195 pr_debug("both pointers are same, returning full avail\n");
196 return stream
->runtime
->buffer_size
;
198 pr_debug("both pointers are same, returning no avail\n");
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
;
208 pr_debug("ret avail as %lld\n", avail
->avail
);
212 static inline size_t snd_compr_get_avail(struct snd_compr_stream
*stream
)
214 struct snd_compr_avail avail
;
216 return snd_compr_calc_avail(stream
, &avail
);
220 snd_compr_ioctl_avail(struct snd_compr_stream
*stream
, unsigned long arg
)
222 struct snd_compr_avail ioctl_avail
;
225 avail
= snd_compr_calc_avail(stream
, &ioctl_avail
);
226 ioctl_avail
.avail
= avail
;
228 if (copy_to_user((__u64 __user
*)arg
,
229 &ioctl_avail
, sizeof(ioctl_avail
)))
234 static int snd_compr_write_data(struct snd_compr_stream
*stream
,
235 const char __user
*buf
, size_t count
)
239 struct snd_compr_runtime
*runtime
= stream
->runtime
;
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
);
246 dstn
= runtime
->buffer
+ app_pointer
;
247 pr_debug("copying %ld at %lld\n",
248 (unsigned long)count
, app_pointer
);
249 if (count
< runtime
->buffer_size
- app_pointer
) {
250 if (copy_from_user(dstn
, buf
, count
))
253 copy
= runtime
->buffer_size
- app_pointer
;
254 if (copy_from_user(dstn
, buf
, copy
))
256 if (copy_from_user(runtime
->buffer
, buf
+ copy
, count
- copy
))
259 /* if DSP cares, let it know data has been written */
260 if (stream
->ops
->ack
)
261 stream
->ops
->ack(stream
, count
);
265 static ssize_t
snd_compr_write(struct file
*f
, const char __user
*buf
,
266 size_t count
, loff_t
*offset
)
268 struct snd_compr_file
*data
= f
->private_data
;
269 struct snd_compr_stream
*stream
;
273 if (snd_BUG_ON(!data
))
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
);
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 */
291 if (stream
->ops
->copy
) {
292 char __user
* cbuf
= (char __user
*)buf
;
293 retval
= stream
->ops
->copy(stream
, cbuf
, avail
);
295 retval
= snd_compr_write_data(stream
, buf
, avail
);
298 stream
->runtime
->total_bytes_available
+= retval
;
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");
307 mutex_unlock(&stream
->device
->lock
);
312 static ssize_t
snd_compr_read(struct file
*f
, char __user
*buf
,
313 size_t count
, loff_t
*offset
)
315 struct snd_compr_file
*data
= f
->private_data
;
316 struct snd_compr_stream
*stream
;
320 if (snd_BUG_ON(!data
))
323 stream
= &data
->stream
;
324 mutex_lock(&stream
->device
->lock
);
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)
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
:
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 */
346 if (stream
->ops
->copy
) {
347 retval
= stream
->ops
->copy(stream
, buf
, avail
);
353 stream
->runtime
->total_bytes_transferred
+= retval
;
356 mutex_unlock(&stream
->device
->lock
);
360 static int snd_compr_mmap(struct file
*f
, struct vm_area_struct
*vma
)
365 static inline int snd_compr_get_poll(struct snd_compr_stream
*stream
)
367 if (stream
->direction
== SND_COMPRESS_PLAYBACK
)
368 return POLLOUT
| POLLWRNORM
;
370 return POLLIN
| POLLRDNORM
;
373 static unsigned int snd_compr_poll(struct file
*f
, poll_table
*wait
)
375 struct snd_compr_file
*data
= f
->private_data
;
376 struct snd_compr_stream
*stream
;
380 if (snd_BUG_ON(!data
))
382 stream
= &data
->stream
;
383 if (snd_BUG_ON(!stream
))
386 mutex_lock(&stream
->device
->lock
);
387 if (stream
->runtime
->state
== SNDRV_PCM_STATE_PAUSED
||
388 stream
->runtime
->state
== SNDRV_PCM_STATE_OPEN
) {
392 poll_wait(f
, &stream
->runtime
->sleep
, wait
);
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
402 retval
= snd_compr_get_poll(stream
);
403 stream
->runtime
->state
= SNDRV_PCM_STATE_SETUP
;
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
);
412 if (stream
->direction
== SND_COMPRESS_PLAYBACK
)
413 retval
= POLLOUT
| POLLWRNORM
| POLLERR
;
415 retval
= POLLIN
| POLLRDNORM
| POLLERR
;
419 mutex_unlock(&stream
->device
->lock
);
424 snd_compr_get_caps(struct snd_compr_stream
*stream
, unsigned long arg
)
427 struct snd_compr_caps caps
;
429 if (!stream
->ops
->get_caps
)
432 memset(&caps
, 0, sizeof(caps
));
433 retval
= stream
->ops
->get_caps(stream
, &caps
);
436 if (copy_to_user((void __user
*)arg
, &caps
, sizeof(caps
)))
443 snd_compr_get_codec_caps(struct snd_compr_stream
*stream
, unsigned long arg
)
446 struct snd_compr_codec_caps
*caps
;
448 if (!stream
->ops
->get_codec_caps
)
451 caps
= kzalloc(sizeof(*caps
), GFP_KERNEL
);
455 retval
= stream
->ops
->get_codec_caps(stream
, caps
);
458 if (copy_to_user((void __user
*)arg
, caps
, sizeof(*caps
)))
466 /* revisit this with snd_pcm_preallocate_xxx */
467 static int snd_compr_allocate_buffer(struct snd_compr_stream
*stream
,
468 struct snd_compr_params
*params
)
470 unsigned int buffer_size
;
473 buffer_size
= params
->buffer
.fragment_size
* params
->buffer
.fragments
;
474 if (stream
->ops
->copy
) {
476 /* if copy is defined the driver will be required to copy
480 buffer
= kmalloc(buffer_size
, GFP_KERNEL
);
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
;
491 static int snd_compress_check_input(struct snd_compr_params
*params
)
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
)
498 /* now codec parameters */
499 if (params
->codec
.id
== 0 || params
->codec
.id
> SND_AUDIOCODEC_MAX
)
502 if (params
->codec
.ch_in
== 0 || params
->codec
.ch_out
== 0)
505 if (!(params
->codec
.sample_rate
& SNDRV_PCM_RATE_8000_192000
))
512 snd_compr_set_params(struct snd_compr_stream
*stream
, unsigned long arg
)
514 struct snd_compr_params
*params
;
517 if (stream
->runtime
->state
== SNDRV_PCM_STATE_OPEN
) {
519 * we should allow parameter change only when stream has been
520 * opened not in other cases
522 params
= kmalloc(sizeof(*params
), GFP_KERNEL
);
525 if (copy_from_user(params
, (void __user
*)arg
, sizeof(*params
))) {
530 retval
= snd_compress_check_input(params
);
534 retval
= snd_compr_allocate_buffer(stream
, params
);
540 retval
= stream
->ops
->set_params(stream
, params
);
544 stream
->metadata_set
= false;
545 stream
->next_track
= false;
547 if (stream
->direction
== SND_COMPRESS_PLAYBACK
)
548 stream
->runtime
->state
= SNDRV_PCM_STATE_SETUP
;
550 stream
->runtime
->state
= SNDRV_PCM_STATE_PREPARED
;
560 snd_compr_get_params(struct snd_compr_stream
*stream
, unsigned long arg
)
562 struct snd_codec
*params
;
565 if (!stream
->ops
->get_params
)
568 params
= kzalloc(sizeof(*params
), GFP_KERNEL
);
571 retval
= stream
->ops
->get_params(stream
, params
);
574 if (copy_to_user((char __user
*)arg
, params
, sizeof(*params
)))
583 snd_compr_get_metadata(struct snd_compr_stream
*stream
, unsigned long arg
)
585 struct snd_compr_metadata metadata
;
588 if (!stream
->ops
->get_metadata
)
591 if (copy_from_user(&metadata
, (void __user
*)arg
, sizeof(metadata
)))
594 retval
= stream
->ops
->get_metadata(stream
, &metadata
);
598 if (copy_to_user((void __user
*)arg
, &metadata
, sizeof(metadata
)))
605 snd_compr_set_metadata(struct snd_compr_stream
*stream
, unsigned long arg
)
607 struct snd_compr_metadata metadata
;
610 if (!stream
->ops
->set_metadata
)
613 * we should allow parameter change only when stream has been
614 * opened not in other cases
616 if (copy_from_user(&metadata
, (void __user
*)arg
, sizeof(metadata
)))
619 retval
= stream
->ops
->set_metadata(stream
, &metadata
);
620 stream
->metadata_set
= true;
626 snd_compr_tstamp(struct snd_compr_stream
*stream
, unsigned long arg
)
628 struct snd_compr_tstamp tstamp
= {0};
631 ret
= snd_compr_update_tstamp(stream
, &tstamp
);
633 ret
= copy_to_user((struct snd_compr_tstamp __user
*)arg
,
634 &tstamp
, sizeof(tstamp
)) ? -EFAULT
: 0;
638 static int snd_compr_pause(struct snd_compr_stream
*stream
)
642 if (stream
->runtime
->state
!= SNDRV_PCM_STATE_RUNNING
)
644 retval
= stream
->ops
->trigger(stream
, SNDRV_PCM_TRIGGER_PAUSE_PUSH
);
646 stream
->runtime
->state
= SNDRV_PCM_STATE_PAUSED
;
650 static int snd_compr_resume(struct snd_compr_stream
*stream
)
654 if (stream
->runtime
->state
!= SNDRV_PCM_STATE_PAUSED
)
656 retval
= stream
->ops
->trigger(stream
, SNDRV_PCM_TRIGGER_PAUSE_RELEASE
);
658 stream
->runtime
->state
= SNDRV_PCM_STATE_RUNNING
;
662 static int snd_compr_start(struct snd_compr_stream
*stream
)
666 if (stream
->runtime
->state
!= SNDRV_PCM_STATE_PREPARED
)
668 retval
= stream
->ops
->trigger(stream
, SNDRV_PCM_TRIGGER_START
);
670 stream
->runtime
->state
= SNDRV_PCM_STATE_RUNNING
;
674 static int snd_compr_stop(struct snd_compr_stream
*stream
)
678 if (stream
->runtime
->state
== SNDRV_PCM_STATE_PREPARED
||
679 stream
->runtime
->state
== SNDRV_PCM_STATE_SETUP
)
681 retval
= stream
->ops
->trigger(stream
, SNDRV_PCM_TRIGGER_STOP
);
683 stream
->runtime
->state
= SNDRV_PCM_STATE_SETUP
;
684 wake_up(&stream
->runtime
->sleep
);
685 stream
->runtime
->total_bytes_available
= 0;
686 stream
->runtime
->total_bytes_transferred
= 0;
691 static int snd_compr_drain(struct snd_compr_stream
*stream
)
695 if (stream
->runtime
->state
== SNDRV_PCM_STATE_PREPARED
||
696 stream
->runtime
->state
== SNDRV_PCM_STATE_SETUP
)
698 retval
= stream
->ops
->trigger(stream
, SND_COMPR_TRIGGER_DRAIN
);
700 stream
->runtime
->state
= SNDRV_PCM_STATE_DRAINING
;
701 wake_up(&stream
->runtime
->sleep
);
706 static int snd_compr_next_track(struct snd_compr_stream
*stream
)
710 /* only a running stream can transition to next track */
711 if (stream
->runtime
->state
!= SNDRV_PCM_STATE_RUNNING
)
714 /* you can signal next track isf this is intended to be a gapless stream
715 * and current track metadata is set
717 if (stream
->metadata_set
== false)
720 retval
= stream
->ops
->trigger(stream
, SND_COMPR_TRIGGER_NEXT_TRACK
);
723 stream
->metadata_set
= false;
724 stream
->next_track
= true;
728 static int snd_compr_partial_drain(struct snd_compr_stream
*stream
)
731 if (stream
->runtime
->state
== SNDRV_PCM_STATE_PREPARED
||
732 stream
->runtime
->state
== SNDRV_PCM_STATE_SETUP
)
734 /* stream can be drained only when next track has been signalled */
735 if (stream
->next_track
== false)
738 retval
= stream
->ops
->trigger(stream
, SND_COMPR_TRIGGER_PARTIAL_DRAIN
);
740 stream
->next_track
= false;
744 static long snd_compr_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
746 struct snd_compr_file
*data
= f
->private_data
;
747 struct snd_compr_stream
*stream
;
748 int retval
= -ENOTTY
;
750 if (snd_BUG_ON(!data
))
752 stream
= &data
->stream
;
753 if (snd_BUG_ON(!stream
))
755 mutex_lock(&stream
->device
->lock
);
756 switch (_IOC_NR(cmd
)) {
757 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION
):
758 retval
= put_user(SNDRV_COMPRESS_VERSION
,
759 (int __user
*)arg
) ? -EFAULT
: 0;
761 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS
):
762 retval
= snd_compr_get_caps(stream
, arg
);
764 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS
):
765 retval
= snd_compr_get_codec_caps(stream
, arg
);
767 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS
):
768 retval
= snd_compr_set_params(stream
, arg
);
770 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS
):
771 retval
= snd_compr_get_params(stream
, arg
);
773 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA
):
774 retval
= snd_compr_set_metadata(stream
, arg
);
776 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA
):
777 retval
= snd_compr_get_metadata(stream
, arg
);
779 case _IOC_NR(SNDRV_COMPRESS_TSTAMP
):
780 retval
= snd_compr_tstamp(stream
, arg
);
782 case _IOC_NR(SNDRV_COMPRESS_AVAIL
):
783 retval
= snd_compr_ioctl_avail(stream
, arg
);
785 case _IOC_NR(SNDRV_COMPRESS_PAUSE
):
786 retval
= snd_compr_pause(stream
);
788 case _IOC_NR(SNDRV_COMPRESS_RESUME
):
789 retval
= snd_compr_resume(stream
);
791 case _IOC_NR(SNDRV_COMPRESS_START
):
792 retval
= snd_compr_start(stream
);
794 case _IOC_NR(SNDRV_COMPRESS_STOP
):
795 retval
= snd_compr_stop(stream
);
797 case _IOC_NR(SNDRV_COMPRESS_DRAIN
):
798 retval
= snd_compr_drain(stream
);
800 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN
):
801 retval
= snd_compr_partial_drain(stream
);
803 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK
):
804 retval
= snd_compr_next_track(stream
);
808 mutex_unlock(&stream
->device
->lock
);
812 static const struct file_operations snd_compr_file_ops
= {
813 .owner
= THIS_MODULE
,
814 .open
= snd_compr_open
,
815 .release
= snd_compr_free
,
816 .write
= snd_compr_write
,
817 .read
= snd_compr_read
,
818 .unlocked_ioctl
= snd_compr_ioctl
,
819 .mmap
= snd_compr_mmap
,
820 .poll
= snd_compr_poll
,
823 static int snd_compress_dev_register(struct snd_device
*device
)
827 struct snd_compr
*compr
;
829 if (snd_BUG_ON(!device
|| !device
->device_data
))
831 compr
= device
->device_data
;
833 sprintf(str
, "comprC%iD%i", compr
->card
->number
, compr
->device
);
834 pr_debug("reg %s for device %s, direction %d\n", str
, compr
->name
,
836 /* register compressed device */
837 ret
= snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS
, compr
->card
,
838 compr
->device
, &snd_compr_file_ops
, compr
, str
);
840 pr_err("snd_register_device failed\n %d", ret
);
847 static int snd_compress_dev_disconnect(struct snd_device
*device
)
849 struct snd_compr
*compr
;
851 compr
= device
->device_data
;
852 snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS
, compr
->card
,
858 * snd_compress_new: create new compress device
859 * @card: sound card pointer
860 * @device: device number
861 * @dirn: device direction, should be of type enum snd_compr_direction
862 * @compr: compress device pointer
864 int snd_compress_new(struct snd_card
*card
, int device
,
865 int dirn
, struct snd_compr
*compr
)
867 static struct snd_device_ops ops
= {
869 .dev_register
= snd_compress_dev_register
,
870 .dev_disconnect
= snd_compress_dev_disconnect
,
874 compr
->device
= device
;
875 compr
->direction
= dirn
;
876 return snd_device_new(card
, SNDRV_DEV_COMPRESS
, compr
, &ops
);
878 EXPORT_SYMBOL_GPL(snd_compress_new
);
880 static int snd_compress_add_device(struct snd_compr
*device
)
887 /* register the card */
888 ret
= snd_card_register(device
->card
);
894 pr_err("failed with %d\n", ret
);
899 static int snd_compress_remove_device(struct snd_compr
*device
)
901 return snd_card_free(device
->card
);
905 * snd_compress_register - register compressed device
907 * @device: compressed device to register
909 int snd_compress_register(struct snd_compr
*device
)
913 if (device
->name
== NULL
|| device
->dev
== NULL
|| device
->ops
== NULL
)
916 pr_debug("Registering compressed device %s\n", device
->name
);
917 if (snd_BUG_ON(!device
->ops
->open
))
919 if (snd_BUG_ON(!device
->ops
->free
))
921 if (snd_BUG_ON(!device
->ops
->set_params
))
923 if (snd_BUG_ON(!device
->ops
->trigger
))
926 mutex_init(&device
->lock
);
928 /* register a compressed card */
929 mutex_lock(&device_mutex
);
930 retval
= snd_compress_add_device(device
);
931 mutex_unlock(&device_mutex
);
934 EXPORT_SYMBOL_GPL(snd_compress_register
);
936 int snd_compress_deregister(struct snd_compr
*device
)
938 pr_debug("Removing compressed device %s\n", device
->name
);
939 mutex_lock(&device_mutex
);
940 snd_compress_remove_device(device
);
941 mutex_unlock(&device_mutex
);
944 EXPORT_SYMBOL_GPL(snd_compress_deregister
);
946 static int __init
snd_compress_init(void)
951 static void __exit
snd_compress_exit(void)
955 module_init(snd_compress_init
);
956 module_exit(snd_compress_exit
);
958 MODULE_DESCRIPTION("ALSA Compressed offload framework");
959 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
960 MODULE_LICENSE("GPL v2");