Commit | Line | Data |
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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 | ||
56 | static DEFINE_MUTEX(device_mutex); | |
57 | ||
58 | struct 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 | */ | |
78 | static 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 | ||
141 | static 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 | 163 | static 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 | ||
178 | static 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 | ||
214 | static 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 | ||
221 | static int | |
222 | snd_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 | ||
236 | static 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 | ||
267 | static 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 | ||
314 | static 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 | ||
357 | out: | |
358 | mutex_unlock(&stream->device->lock); | |
359 | return retval; | |
b21c60a4 VK |
360 | } |
361 | ||
362 | static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) | |
363 | { | |
364 | return -ENXIO; | |
365 | } | |
366 | ||
367 | static 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 | ||
375 | static 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 | } | |
419 | out: | |
420 | mutex_unlock(&stream->device->lock); | |
421 | return retval; | |
422 | } | |
423 | ||
424 | static int | |
425 | snd_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; | |
439 | out: | |
440 | return retval; | |
441 | } | |
442 | ||
443 | static int | |
444 | snd_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 | ||
462 | out: | |
463 | kfree(caps); | |
464 | return retval; | |
465 | } | |
466 | ||
467 | /* revisit this with snd_pcm_preallocate_xxx */ | |
468 | static 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 |
492 | static 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 |
509 | static int |
510 | snd_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 |
552 | out: |
553 | kfree(params); | |
554 | return retval; | |
555 | } | |
556 | ||
557 | static int | |
558 | snd_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 | ||
575 | out: | |
576 | kfree(params); | |
577 | return retval; | |
578 | } | |
579 | ||
9727b490 JK |
580 | static int |
581 | snd_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 | ||
602 | static int | |
603 | snd_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 |
623 | static inline int |
624 | snd_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 | ||
636 | static 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 | ||
648 | static 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 | ||
660 | static 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 | ||
672 | static 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 |
688 | static 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 |
723 | static 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 |
741 | static 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 | ||
763 | static 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 |
784 | static 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 | |
854 | static 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 |
861 | static 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 | ||
875 | static 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 | ||
899 | static 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 |
909 | static 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 | ||
922 | static 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 | ||
954 | static 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 | |
962 | static 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 |
967 | static inline int snd_compress_proc_init(struct snd_compr *compr) | |
968 | { | |
969 | return 0; | |
970 | } | |
971 | ||
972 | static inline void snd_compress_proc_done(struct snd_compr *compr) | |
973 | { | |
974 | } | |
e5241a8c RF |
975 | |
976 | static inline void snd_compress_set_id(struct snd_compr *compr, const char *id) | |
977 | { | |
978 | } | |
31742724 RF |
979 | #endif |
980 | ||
04c5d5a4 TI |
981 | static 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 | */ | |
998 | int 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 | } |
1023 | EXPORT_SYMBOL_GPL(snd_compress_new); | |
1024 | ||
1025 | static 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 | ||
1038 | out: | |
1039 | pr_err("failed with %d\n", ret); | |
1040 | return ret; | |
1041 | ||
1042 | } | |
1043 | ||
1044 | static 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 | */ | |
1054 | int 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 | } | |
1079 | EXPORT_SYMBOL_GPL(snd_compress_register); | |
1080 | ||
1081 | int 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 | } | |
1089 | EXPORT_SYMBOL_GPL(snd_compress_deregister); | |
1090 | ||
1091 | static int __init snd_compress_init(void) | |
1092 | { | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static void __exit snd_compress_exit(void) | |
1097 | { | |
1098 | } | |
1099 | ||
1100 | module_init(snd_compress_init); | |
1101 | module_exit(snd_compress_exit); | |
1102 | ||
1103 | MODULE_DESCRIPTION("ALSA Compressed offload framework"); | |
1104 | MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>"); | |
1105 | MODULE_LICENSE("GPL v2"); |