Commit | Line | Data |
---|---|---|
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 | ||
462b3f16 TI |
49 | /* struct snd_compr_codec_caps overflows the ioctl bit size for some |
50 | * architectures, so we need to disable the relevant ioctls. | |
51 | */ | |
52 | #if _IOC_SIZEBITS < 14 | |
53 | #define COMPR_CODEC_CAPS_OVERFLOW | |
54 | #endif | |
55 | ||
b21c60a4 VK |
56 | /* TODO: |
57 | * - add substream support for multiple devices in case of | |
58 | * SND_DYNAMIC_MINORS is not used | |
59 | * - Multiple node representation | |
60 | * driver should be able to register multiple nodes | |
61 | */ | |
62 | ||
63 | static DEFINE_MUTEX(device_mutex); | |
64 | ||
65 | struct snd_compr_file { | |
66 | unsigned long caps; | |
67 | struct snd_compr_stream stream; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * a note on stream states used: | |
72 | * we use follwing states in the compressed core | |
73 | * SNDRV_PCM_STATE_OPEN: When stream has been opened. | |
74 | * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by | |
75 | * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this | |
76 | * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain. | |
77 | * SNDRV_PCM_STATE_RUNNING: When stream has been started and is | |
78 | * decoding/encoding and rendering/capturing data. | |
79 | * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done | |
80 | * by calling SNDRV_COMPRESS_DRAIN. | |
81 | * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling | |
82 | * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling | |
83 | * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively. | |
84 | */ | |
85 | static int snd_compr_open(struct inode *inode, struct file *f) | |
86 | { | |
87 | struct snd_compr *compr; | |
88 | struct snd_compr_file *data; | |
89 | struct snd_compr_runtime *runtime; | |
90 | enum snd_compr_direction dirn; | |
91 | int maj = imajor(inode); | |
92 | int ret; | |
93 | ||
81cb3246 | 94 | if ((f->f_flags & O_ACCMODE) == O_WRONLY) |
b21c60a4 | 95 | dirn = SND_COMPRESS_PLAYBACK; |
81cb3246 | 96 | else if ((f->f_flags & O_ACCMODE) == O_RDONLY) |
b21c60a4 | 97 | dirn = SND_COMPRESS_CAPTURE; |
81cb3246 | 98 | else |
b21c60a4 | 99 | return -EINVAL; |
b21c60a4 VK |
100 | |
101 | if (maj == snd_major) | |
102 | compr = snd_lookup_minor_data(iminor(inode), | |
103 | SNDRV_DEVICE_TYPE_COMPRESS); | |
104 | else | |
105 | return -EBADFD; | |
106 | ||
107 | if (compr == NULL) { | |
108 | pr_err("no device data!!!\n"); | |
109 | return -ENODEV; | |
110 | } | |
111 | ||
112 | if (dirn != compr->direction) { | |
113 | pr_err("this device doesn't support this direction\n"); | |
a0830dbd | 114 | snd_card_unref(compr->card); |
b21c60a4 VK |
115 | return -EINVAL; |
116 | } | |
117 | ||
118 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
a0830dbd TI |
119 | if (!data) { |
120 | snd_card_unref(compr->card); | |
b21c60a4 | 121 | return -ENOMEM; |
a0830dbd | 122 | } |
b21c60a4 VK |
123 | data->stream.ops = compr->ops; |
124 | data->stream.direction = dirn; | |
125 | data->stream.private_data = compr->private_data; | |
126 | data->stream.device = compr; | |
127 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); | |
128 | if (!runtime) { | |
129 | kfree(data); | |
a0830dbd | 130 | snd_card_unref(compr->card); |
b21c60a4 VK |
131 | return -ENOMEM; |
132 | } | |
133 | runtime->state = SNDRV_PCM_STATE_OPEN; | |
134 | init_waitqueue_head(&runtime->sleep); | |
135 | data->stream.runtime = runtime; | |
136 | f->private_data = (void *)data; | |
137 | mutex_lock(&compr->lock); | |
138 | ret = compr->ops->open(&data->stream); | |
139 | mutex_unlock(&compr->lock); | |
140 | if (ret) { | |
141 | kfree(runtime); | |
142 | kfree(data); | |
143 | } | |
a0830dbd | 144 | snd_card_unref(compr->card); |
749d3223 | 145 | return ret; |
b21c60a4 VK |
146 | } |
147 | ||
148 | static int snd_compr_free(struct inode *inode, struct file *f) | |
149 | { | |
150 | struct snd_compr_file *data = f->private_data; | |
b26d19e4 LG |
151 | struct snd_compr_runtime *runtime = data->stream.runtime; |
152 | ||
153 | switch (runtime->state) { | |
154 | case SNDRV_PCM_STATE_RUNNING: | |
155 | case SNDRV_PCM_STATE_DRAINING: | |
156 | case SNDRV_PCM_STATE_PAUSED: | |
157 | data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP); | |
158 | break; | |
159 | default: | |
160 | break; | |
161 | } | |
162 | ||
b21c60a4 VK |
163 | data->stream.ops->free(&data->stream); |
164 | kfree(data->stream.runtime->buffer); | |
165 | kfree(data->stream.runtime); | |
166 | kfree(data); | |
167 | return 0; | |
168 | } | |
169 | ||
17ac8e5c | 170 | static int snd_compr_update_tstamp(struct snd_compr_stream *stream, |
b21c60a4 VK |
171 | struct snd_compr_tstamp *tstamp) |
172 | { | |
173 | if (!stream->ops->pointer) | |
17ac8e5c | 174 | return -ENOTSUPP; |
b21c60a4 VK |
175 | stream->ops->pointer(stream, tstamp); |
176 | pr_debug("dsp consumed till %d total %d bytes\n", | |
177 | tstamp->byte_offset, tstamp->copied_total); | |
5b1f79f7 CK |
178 | if (stream->direction == SND_COMPRESS_PLAYBACK) |
179 | stream->runtime->total_bytes_transferred = tstamp->copied_total; | |
180 | else | |
181 | stream->runtime->total_bytes_available = tstamp->copied_total; | |
17ac8e5c | 182 | return 0; |
b21c60a4 VK |
183 | } |
184 | ||
185 | static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, | |
186 | struct snd_compr_avail *avail) | |
187 | { | |
17ac8e5c | 188 | memset(avail, 0, sizeof(*avail)); |
b21c60a4 | 189 | snd_compr_update_tstamp(stream, &avail->tstamp); |
17ac8e5c | 190 | /* Still need to return avail even if tstamp can't be filled in */ |
b21c60a4 | 191 | |
b21c60a4 | 192 | if (stream->runtime->total_bytes_available == 0 && |
5b1f79f7 CK |
193 | stream->runtime->state == SNDRV_PCM_STATE_SETUP && |
194 | stream->direction == SND_COMPRESS_PLAYBACK) { | |
b21c60a4 VK |
195 | pr_debug("detected init and someone forgot to do a write\n"); |
196 | return stream->runtime->buffer_size; | |
197 | } | |
198 | pr_debug("app wrote %lld, DSP consumed %lld\n", | |
199 | stream->runtime->total_bytes_available, | |
200 | stream->runtime->total_bytes_transferred); | |
201 | if (stream->runtime->total_bytes_available == | |
202 | stream->runtime->total_bytes_transferred) { | |
5b1f79f7 CK |
203 | if (stream->direction == SND_COMPRESS_PLAYBACK) { |
204 | pr_debug("both pointers are same, returning full avail\n"); | |
205 | return stream->runtime->buffer_size; | |
206 | } else { | |
207 | pr_debug("both pointers are same, returning no avail\n"); | |
208 | return 0; | |
209 | } | |
b21c60a4 VK |
210 | } |
211 | ||
5b1f79f7 CK |
212 | avail->avail = stream->runtime->total_bytes_available - |
213 | stream->runtime->total_bytes_transferred; | |
214 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
215 | avail->avail = stream->runtime->buffer_size - avail->avail; | |
216 | ||
4c28e32d CK |
217 | pr_debug("ret avail as %lld\n", avail->avail); |
218 | return avail->avail; | |
b21c60a4 VK |
219 | } |
220 | ||
221 | static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) | |
222 | { | |
223 | struct snd_compr_avail avail; | |
224 | ||
225 | return snd_compr_calc_avail(stream, &avail); | |
226 | } | |
227 | ||
228 | static int | |
229 | snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) | |
230 | { | |
231 | struct snd_compr_avail ioctl_avail; | |
232 | size_t avail; | |
233 | ||
234 | avail = snd_compr_calc_avail(stream, &ioctl_avail); | |
235 | ioctl_avail.avail = avail; | |
236 | ||
237 | if (copy_to_user((__u64 __user *)arg, | |
238 | &ioctl_avail, sizeof(ioctl_avail))) | |
239 | return -EFAULT; | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int snd_compr_write_data(struct snd_compr_stream *stream, | |
244 | const char __user *buf, size_t count) | |
245 | { | |
246 | void *dstn; | |
247 | size_t copy; | |
248 | struct snd_compr_runtime *runtime = stream->runtime; | |
f0283b58 CK |
249 | /* 64-bit Modulus */ |
250 | u64 app_pointer = div64_u64(runtime->total_bytes_available, | |
251 | runtime->buffer_size); | |
252 | app_pointer = runtime->total_bytes_available - | |
253 | (app_pointer * runtime->buffer_size); | |
b21c60a4 | 254 | |
f0283b58 | 255 | dstn = runtime->buffer + app_pointer; |
b21c60a4 | 256 | pr_debug("copying %ld at %lld\n", |
f0283b58 CK |
257 | (unsigned long)count, app_pointer); |
258 | if (count < runtime->buffer_size - app_pointer) { | |
b21c60a4 VK |
259 | if (copy_from_user(dstn, buf, count)) |
260 | return -EFAULT; | |
b21c60a4 | 261 | } else { |
f0283b58 | 262 | copy = runtime->buffer_size - app_pointer; |
b21c60a4 VK |
263 | if (copy_from_user(dstn, buf, copy)) |
264 | return -EFAULT; | |
265 | if (copy_from_user(runtime->buffer, buf + copy, count - copy)) | |
266 | return -EFAULT; | |
b21c60a4 VK |
267 | } |
268 | /* if DSP cares, let it know data has been written */ | |
269 | if (stream->ops->ack) | |
270 | stream->ops->ack(stream, count); | |
271 | return count; | |
272 | } | |
273 | ||
274 | static ssize_t snd_compr_write(struct file *f, const char __user *buf, | |
275 | size_t count, loff_t *offset) | |
276 | { | |
277 | struct snd_compr_file *data = f->private_data; | |
278 | struct snd_compr_stream *stream; | |
279 | size_t avail; | |
280 | int retval; | |
281 | ||
282 | if (snd_BUG_ON(!data)) | |
283 | return -EFAULT; | |
284 | ||
285 | stream = &data->stream; | |
286 | mutex_lock(&stream->device->lock); | |
287 | /* write is allowed when stream is running or has been steup */ | |
288 | if (stream->runtime->state != SNDRV_PCM_STATE_SETUP && | |
289 | stream->runtime->state != SNDRV_PCM_STATE_RUNNING) { | |
290 | mutex_unlock(&stream->device->lock); | |
291 | return -EBADFD; | |
292 | } | |
293 | ||
294 | avail = snd_compr_get_avail(stream); | |
295 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
296 | /* calculate how much we can write to buffer */ | |
297 | if (avail > count) | |
298 | avail = count; | |
299 | ||
4daf891c CK |
300 | if (stream->ops->copy) { |
301 | char __user* cbuf = (char __user*)buf; | |
302 | retval = stream->ops->copy(stream, cbuf, avail); | |
303 | } else { | |
b21c60a4 | 304 | retval = snd_compr_write_data(stream, buf, avail); |
4daf891c | 305 | } |
b21c60a4 VK |
306 | if (retval > 0) |
307 | stream->runtime->total_bytes_available += retval; | |
308 | ||
309 | /* while initiating the stream, write should be called before START | |
310 | * call, so in setup move state */ | |
311 | if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) { | |
312 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
313 | pr_debug("stream prepared, Houston we are good to go\n"); | |
314 | } | |
315 | ||
316 | mutex_unlock(&stream->device->lock); | |
317 | return retval; | |
318 | } | |
319 | ||
320 | ||
321 | static ssize_t snd_compr_read(struct file *f, char __user *buf, | |
322 | size_t count, loff_t *offset) | |
323 | { | |
49bb6402 CK |
324 | struct snd_compr_file *data = f->private_data; |
325 | struct snd_compr_stream *stream; | |
326 | size_t avail; | |
327 | int retval; | |
328 | ||
329 | if (snd_BUG_ON(!data)) | |
330 | return -EFAULT; | |
331 | ||
332 | stream = &data->stream; | |
333 | mutex_lock(&stream->device->lock); | |
334 | ||
75481347 VK |
335 | /* read is allowed when stream is running, paused, draining and setup |
336 | * (yes setup is state which we transition to after stop, so if user | |
337 | * wants to read data after stop we allow that) | |
338 | */ | |
339 | switch (stream->runtime->state) { | |
340 | case SNDRV_PCM_STATE_OPEN: | |
341 | case SNDRV_PCM_STATE_PREPARED: | |
342 | case SNDRV_PCM_STATE_XRUN: | |
343 | case SNDRV_PCM_STATE_SUSPENDED: | |
344 | case SNDRV_PCM_STATE_DISCONNECTED: | |
49bb6402 CK |
345 | retval = -EBADFD; |
346 | goto out; | |
347 | } | |
348 | ||
349 | avail = snd_compr_get_avail(stream); | |
350 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
351 | /* calculate how much we can read from buffer */ | |
352 | if (avail > count) | |
353 | avail = count; | |
354 | ||
355 | if (stream->ops->copy) { | |
356 | retval = stream->ops->copy(stream, buf, avail); | |
357 | } else { | |
358 | retval = -ENXIO; | |
359 | goto out; | |
360 | } | |
361 | if (retval > 0) | |
362 | stream->runtime->total_bytes_transferred += retval; | |
363 | ||
364 | out: | |
365 | mutex_unlock(&stream->device->lock); | |
366 | return retval; | |
b21c60a4 VK |
367 | } |
368 | ||
369 | static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) | |
370 | { | |
371 | return -ENXIO; | |
372 | } | |
373 | ||
374 | static inline int snd_compr_get_poll(struct snd_compr_stream *stream) | |
375 | { | |
376 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
377 | return POLLOUT | POLLWRNORM; | |
378 | else | |
379 | return POLLIN | POLLRDNORM; | |
380 | } | |
381 | ||
382 | static unsigned int snd_compr_poll(struct file *f, poll_table *wait) | |
383 | { | |
384 | struct snd_compr_file *data = f->private_data; | |
385 | struct snd_compr_stream *stream; | |
386 | size_t avail; | |
387 | int retval = 0; | |
388 | ||
389 | if (snd_BUG_ON(!data)) | |
390 | return -EFAULT; | |
391 | stream = &data->stream; | |
392 | if (snd_BUG_ON(!stream)) | |
393 | return -EFAULT; | |
394 | ||
395 | mutex_lock(&stream->device->lock); | |
c15b149a | 396 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { |
b21c60a4 VK |
397 | retval = -EBADFD; |
398 | goto out; | |
399 | } | |
400 | poll_wait(f, &stream->runtime->sleep, wait); | |
401 | ||
402 | avail = snd_compr_get_avail(stream); | |
403 | pr_debug("avail is %ld\n", (unsigned long)avail); | |
404 | /* check if we have at least one fragment to fill */ | |
405 | switch (stream->runtime->state) { | |
406 | case SNDRV_PCM_STATE_DRAINING: | |
407 | /* stream has been woken up after drain is complete | |
408 | * draining done so set stream state to stopped | |
409 | */ | |
410 | retval = snd_compr_get_poll(stream); | |
411 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
412 | break; | |
413 | case SNDRV_PCM_STATE_RUNNING: | |
414 | case SNDRV_PCM_STATE_PREPARED: | |
415 | case SNDRV_PCM_STATE_PAUSED: | |
416 | if (avail >= stream->runtime->fragment_size) | |
417 | retval = snd_compr_get_poll(stream); | |
418 | break; | |
419 | default: | |
420 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
421 | retval = POLLOUT | POLLWRNORM | POLLERR; | |
422 | else | |
423 | retval = POLLIN | POLLRDNORM | POLLERR; | |
424 | break; | |
425 | } | |
426 | out: | |
427 | mutex_unlock(&stream->device->lock); | |
428 | return retval; | |
429 | } | |
430 | ||
431 | static int | |
432 | snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg) | |
433 | { | |
434 | int retval; | |
435 | struct snd_compr_caps caps; | |
436 | ||
437 | if (!stream->ops->get_caps) | |
438 | return -ENXIO; | |
439 | ||
1c62e9f2 | 440 | memset(&caps, 0, sizeof(caps)); |
b21c60a4 VK |
441 | retval = stream->ops->get_caps(stream, &caps); |
442 | if (retval) | |
443 | goto out; | |
444 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) | |
445 | retval = -EFAULT; | |
446 | out: | |
447 | return retval; | |
448 | } | |
449 | ||
462b3f16 | 450 | #ifndef COMPR_CODEC_CAPS_OVERFLOW |
b21c60a4 VK |
451 | static int |
452 | snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg) | |
453 | { | |
454 | int retval; | |
455 | struct snd_compr_codec_caps *caps; | |
456 | ||
457 | if (!stream->ops->get_codec_caps) | |
458 | return -ENXIO; | |
459 | ||
47966e97 | 460 | caps = kzalloc(sizeof(*caps), GFP_KERNEL); |
b21c60a4 VK |
461 | if (!caps) |
462 | return -ENOMEM; | |
463 | ||
464 | retval = stream->ops->get_codec_caps(stream, caps); | |
465 | if (retval) | |
466 | goto out; | |
467 | if (copy_to_user((void __user *)arg, caps, sizeof(*caps))) | |
468 | retval = -EFAULT; | |
469 | ||
470 | out: | |
471 | kfree(caps); | |
472 | return retval; | |
473 | } | |
462b3f16 | 474 | #endif /* !COMPR_CODEC_CAPS_OVERFLOW */ |
b21c60a4 VK |
475 | |
476 | /* revisit this with snd_pcm_preallocate_xxx */ | |
477 | static int snd_compr_allocate_buffer(struct snd_compr_stream *stream, | |
478 | struct snd_compr_params *params) | |
479 | { | |
480 | unsigned int buffer_size; | |
481 | void *buffer; | |
482 | ||
483 | buffer_size = params->buffer.fragment_size * params->buffer.fragments; | |
484 | if (stream->ops->copy) { | |
485 | buffer = NULL; | |
486 | /* if copy is defined the driver will be required to copy | |
487 | * the data from core | |
488 | */ | |
489 | } else { | |
490 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
491 | if (!buffer) | |
492 | return -ENOMEM; | |
493 | } | |
494 | stream->runtime->fragment_size = params->buffer.fragment_size; | |
495 | stream->runtime->fragments = params->buffer.fragments; | |
496 | stream->runtime->buffer = buffer; | |
497 | stream->runtime->buffer_size = buffer_size; | |
498 | return 0; | |
499 | } | |
500 | ||
4dc040a0 VK |
501 | static int snd_compress_check_input(struct snd_compr_params *params) |
502 | { | |
503 | /* first let's check the buffer parameter's */ | |
504 | if (params->buffer.fragment_size == 0 || | |
6217e5ed | 505 | params->buffer.fragments > INT_MAX / params->buffer.fragment_size) |
4dc040a0 VK |
506 | return -EINVAL; |
507 | ||
fb4a9779 VK |
508 | /* now codec parameters */ |
509 | if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX) | |
510 | return -EINVAL; | |
511 | ||
512 | if (params->codec.ch_in == 0 || params->codec.ch_out == 0) | |
513 | return -EINVAL; | |
fb4a9779 | 514 | |
4dc040a0 VK |
515 | return 0; |
516 | } | |
517 | ||
b21c60a4 VK |
518 | static int |
519 | snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) | |
520 | { | |
521 | struct snd_compr_params *params; | |
522 | int retval; | |
523 | ||
524 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { | |
525 | /* | |
526 | * we should allow parameter change only when stream has been | |
527 | * opened not in other cases | |
528 | */ | |
529 | params = kmalloc(sizeof(*params), GFP_KERNEL); | |
530 | if (!params) | |
531 | return -ENOMEM; | |
769fab2a JJ |
532 | if (copy_from_user(params, (void __user *)arg, sizeof(*params))) { |
533 | retval = -EFAULT; | |
534 | goto out; | |
535 | } | |
4dc040a0 VK |
536 | |
537 | retval = snd_compress_check_input(params); | |
538 | if (retval) | |
539 | goto out; | |
540 | ||
b21c60a4 VK |
541 | retval = snd_compr_allocate_buffer(stream, params); |
542 | if (retval) { | |
769fab2a JJ |
543 | retval = -ENOMEM; |
544 | goto out; | |
b21c60a4 | 545 | } |
4dc040a0 | 546 | |
b21c60a4 VK |
547 | retval = stream->ops->set_params(stream, params); |
548 | if (retval) | |
549 | goto out; | |
49bb6402 | 550 | |
9727b490 JK |
551 | stream->metadata_set = false; |
552 | stream->next_track = false; | |
49bb6402 CK |
553 | |
554 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
555 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
556 | else | |
557 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
769fab2a | 558 | } else { |
b21c60a4 | 559 | return -EPERM; |
769fab2a | 560 | } |
b21c60a4 VK |
561 | out: |
562 | kfree(params); | |
563 | return retval; | |
564 | } | |
565 | ||
566 | static int | |
567 | snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg) | |
568 | { | |
569 | struct snd_codec *params; | |
570 | int retval; | |
571 | ||
572 | if (!stream->ops->get_params) | |
573 | return -EBADFD; | |
574 | ||
47966e97 | 575 | params = kzalloc(sizeof(*params), GFP_KERNEL); |
b21c60a4 VK |
576 | if (!params) |
577 | return -ENOMEM; | |
578 | retval = stream->ops->get_params(stream, params); | |
579 | if (retval) | |
580 | goto out; | |
581 | if (copy_to_user((char __user *)arg, params, sizeof(*params))) | |
582 | retval = -EFAULT; | |
583 | ||
584 | out: | |
585 | kfree(params); | |
586 | return retval; | |
587 | } | |
588 | ||
9727b490 JK |
589 | static int |
590 | snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
591 | { | |
592 | struct snd_compr_metadata metadata; | |
593 | int retval; | |
594 | ||
595 | if (!stream->ops->get_metadata) | |
596 | return -ENXIO; | |
597 | ||
598 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
599 | return -EFAULT; | |
600 | ||
601 | retval = stream->ops->get_metadata(stream, &metadata); | |
602 | if (retval != 0) | |
603 | return retval; | |
604 | ||
605 | if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata))) | |
606 | return -EFAULT; | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | static int | |
612 | snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
613 | { | |
614 | struct snd_compr_metadata metadata; | |
615 | int retval; | |
616 | ||
617 | if (!stream->ops->set_metadata) | |
618 | return -ENXIO; | |
619 | /* | |
620 | * we should allow parameter change only when stream has been | |
621 | * opened not in other cases | |
622 | */ | |
623 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
624 | return -EFAULT; | |
625 | ||
626 | retval = stream->ops->set_metadata(stream, &metadata); | |
627 | stream->metadata_set = true; | |
628 | ||
629 | return retval; | |
630 | } | |
631 | ||
b21c60a4 VK |
632 | static inline int |
633 | snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg) | |
634 | { | |
17ac8e5c RF |
635 | struct snd_compr_tstamp tstamp = {0}; |
636 | int ret; | |
b21c60a4 | 637 | |
17ac8e5c RF |
638 | ret = snd_compr_update_tstamp(stream, &tstamp); |
639 | if (ret == 0) | |
640 | ret = copy_to_user((struct snd_compr_tstamp __user *)arg, | |
641 | &tstamp, sizeof(tstamp)) ? -EFAULT : 0; | |
642 | return ret; | |
b21c60a4 VK |
643 | } |
644 | ||
645 | static int snd_compr_pause(struct snd_compr_stream *stream) | |
646 | { | |
647 | int retval; | |
648 | ||
649 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
650 | return -EPERM; | |
651 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); | |
6b18f793 | 652 | if (!retval) |
b21c60a4 | 653 | stream->runtime->state = SNDRV_PCM_STATE_PAUSED; |
b21c60a4 VK |
654 | return retval; |
655 | } | |
656 | ||
657 | static int snd_compr_resume(struct snd_compr_stream *stream) | |
658 | { | |
659 | int retval; | |
660 | ||
661 | if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED) | |
662 | return -EPERM; | |
663 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); | |
664 | if (!retval) | |
665 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
666 | return retval; | |
667 | } | |
668 | ||
669 | static int snd_compr_start(struct snd_compr_stream *stream) | |
670 | { | |
671 | int retval; | |
672 | ||
673 | if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED) | |
674 | return -EPERM; | |
675 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START); | |
676 | if (!retval) | |
677 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
678 | return retval; | |
679 | } | |
680 | ||
681 | static int snd_compr_stop(struct snd_compr_stream *stream) | |
682 | { | |
683 | int retval; | |
684 | ||
685 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
686 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
687 | return -EPERM; | |
688 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP); | |
689 | if (!retval) { | |
917f4b5c | 690 | snd_compr_drain_notify(stream); |
8b21460a VK |
691 | stream->runtime->total_bytes_available = 0; |
692 | stream->runtime->total_bytes_transferred = 0; | |
b21c60a4 VK |
693 | } |
694 | return retval; | |
695 | } | |
696 | ||
917f4b5c VK |
697 | static int snd_compress_wait_for_drain(struct snd_compr_stream *stream) |
698 | { | |
f44f2a54 VK |
699 | int ret; |
700 | ||
917f4b5c VK |
701 | /* |
702 | * We are called with lock held. So drop the lock while we wait for | |
703 | * drain complete notfication from the driver | |
704 | * | |
705 | * It is expected that driver will notify the drain completion and then | |
706 | * stream will be moved to SETUP state, even if draining resulted in an | |
707 | * error. We can trigger next track after this. | |
708 | */ | |
709 | stream->runtime->state = SNDRV_PCM_STATE_DRAINING; | |
710 | mutex_unlock(&stream->device->lock); | |
711 | ||
f44f2a54 VK |
712 | /* we wait for drain to complete here, drain can return when |
713 | * interruption occurred, wait returned error or success. | |
714 | * For the first two cases we don't do anything different here and | |
715 | * return after waking up | |
716 | */ | |
717 | ||
718 | ret = wait_event_interruptible(stream->runtime->sleep, | |
719 | (stream->runtime->state != SNDRV_PCM_STATE_DRAINING)); | |
720 | if (ret == -ERESTARTSYS) | |
721 | pr_debug("wait aborted by a signal"); | |
722 | else if (ret) | |
723 | pr_debug("wait for drain failed with %d\n", ret); | |
724 | ||
917f4b5c VK |
725 | |
726 | wake_up(&stream->runtime->sleep); | |
727 | mutex_lock(&stream->device->lock); | |
728 | ||
f44f2a54 | 729 | return ret; |
917f4b5c VK |
730 | } |
731 | ||
b21c60a4 VK |
732 | static int snd_compr_drain(struct snd_compr_stream *stream) |
733 | { | |
734 | int retval; | |
735 | ||
736 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
737 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
738 | return -EPERM; | |
917f4b5c | 739 | |
b21c60a4 | 740 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN); |
917f4b5c | 741 | if (retval) { |
f44f2a54 | 742 | pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval); |
b21c60a4 | 743 | wake_up(&stream->runtime->sleep); |
917f4b5c | 744 | return retval; |
b21c60a4 | 745 | } |
917f4b5c | 746 | |
f44f2a54 | 747 | return snd_compress_wait_for_drain(stream); |
b21c60a4 VK |
748 | } |
749 | ||
9727b490 JK |
750 | static int snd_compr_next_track(struct snd_compr_stream *stream) |
751 | { | |
752 | int retval; | |
753 | ||
754 | /* only a running stream can transition to next track */ | |
755 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
756 | return -EPERM; | |
757 | ||
758 | /* you can signal next track isf this is intended to be a gapless stream | |
759 | * and current track metadata is set | |
760 | */ | |
761 | if (stream->metadata_set == false) | |
762 | return -EPERM; | |
763 | ||
764 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK); | |
765 | if (retval != 0) | |
766 | return retval; | |
767 | stream->metadata_set = false; | |
768 | stream->next_track = true; | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static int snd_compr_partial_drain(struct snd_compr_stream *stream) | |
773 | { | |
774 | int retval; | |
775 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
776 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
777 | return -EPERM; | |
778 | /* stream can be drained only when next track has been signalled */ | |
779 | if (stream->next_track == false) | |
780 | return -EPERM; | |
781 | ||
782 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN); | |
917f4b5c | 783 | if (retval) { |
f44f2a54 | 784 | pr_debug("Partial drain returned failure\n"); |
917f4b5c VK |
785 | wake_up(&stream->runtime->sleep); |
786 | return retval; | |
787 | } | |
9727b490 JK |
788 | |
789 | stream->next_track = false; | |
917f4b5c | 790 | return snd_compress_wait_for_drain(stream); |
9727b490 JK |
791 | } |
792 | ||
b21c60a4 VK |
793 | static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
794 | { | |
795 | struct snd_compr_file *data = f->private_data; | |
796 | struct snd_compr_stream *stream; | |
797 | int retval = -ENOTTY; | |
798 | ||
799 | if (snd_BUG_ON(!data)) | |
800 | return -EFAULT; | |
801 | stream = &data->stream; | |
802 | if (snd_BUG_ON(!stream)) | |
803 | return -EFAULT; | |
804 | mutex_lock(&stream->device->lock); | |
805 | switch (_IOC_NR(cmd)) { | |
806 | case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION): | |
a8d30608 | 807 | retval = put_user(SNDRV_COMPRESS_VERSION, |
b21c60a4 VK |
808 | (int __user *)arg) ? -EFAULT : 0; |
809 | break; | |
810 | case _IOC_NR(SNDRV_COMPRESS_GET_CAPS): | |
811 | retval = snd_compr_get_caps(stream, arg); | |
812 | break; | |
462b3f16 | 813 | #ifndef COMPR_CODEC_CAPS_OVERFLOW |
b21c60a4 VK |
814 | case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS): |
815 | retval = snd_compr_get_codec_caps(stream, arg); | |
816 | break; | |
462b3f16 | 817 | #endif |
b21c60a4 VK |
818 | case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS): |
819 | retval = snd_compr_set_params(stream, arg); | |
820 | break; | |
821 | case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS): | |
822 | retval = snd_compr_get_params(stream, arg); | |
823 | break; | |
9727b490 JK |
824 | case _IOC_NR(SNDRV_COMPRESS_SET_METADATA): |
825 | retval = snd_compr_set_metadata(stream, arg); | |
826 | break; | |
827 | case _IOC_NR(SNDRV_COMPRESS_GET_METADATA): | |
828 | retval = snd_compr_get_metadata(stream, arg); | |
829 | break; | |
b21c60a4 VK |
830 | case _IOC_NR(SNDRV_COMPRESS_TSTAMP): |
831 | retval = snd_compr_tstamp(stream, arg); | |
832 | break; | |
833 | case _IOC_NR(SNDRV_COMPRESS_AVAIL): | |
834 | retval = snd_compr_ioctl_avail(stream, arg); | |
835 | break; | |
836 | case _IOC_NR(SNDRV_COMPRESS_PAUSE): | |
837 | retval = snd_compr_pause(stream); | |
838 | break; | |
839 | case _IOC_NR(SNDRV_COMPRESS_RESUME): | |
840 | retval = snd_compr_resume(stream); | |
841 | break; | |
842 | case _IOC_NR(SNDRV_COMPRESS_START): | |
843 | retval = snd_compr_start(stream); | |
844 | break; | |
845 | case _IOC_NR(SNDRV_COMPRESS_STOP): | |
846 | retval = snd_compr_stop(stream); | |
847 | break; | |
848 | case _IOC_NR(SNDRV_COMPRESS_DRAIN): | |
849 | retval = snd_compr_drain(stream); | |
850 | break; | |
9727b490 JK |
851 | case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN): |
852 | retval = snd_compr_partial_drain(stream); | |
853 | break; | |
854 | case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK): | |
855 | retval = snd_compr_next_track(stream); | |
856 | break; | |
857 | ||
b21c60a4 VK |
858 | } |
859 | mutex_unlock(&stream->device->lock); | |
860 | return retval; | |
861 | } | |
862 | ||
c1036889 RL |
863 | /* support of 32bit userspace on 64bit platforms */ |
864 | #ifdef CONFIG_COMPAT | |
865 | static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd, | |
866 | unsigned long arg) | |
867 | { | |
868 | return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
869 | } | |
870 | #endif | |
871 | ||
b21c60a4 VK |
872 | static const struct file_operations snd_compr_file_ops = { |
873 | .owner = THIS_MODULE, | |
874 | .open = snd_compr_open, | |
875 | .release = snd_compr_free, | |
876 | .write = snd_compr_write, | |
877 | .read = snd_compr_read, | |
878 | .unlocked_ioctl = snd_compr_ioctl, | |
c1036889 RL |
879 | #ifdef CONFIG_COMPAT |
880 | .compat_ioctl = snd_compr_ioctl_compat, | |
881 | #endif | |
b21c60a4 VK |
882 | .mmap = snd_compr_mmap, |
883 | .poll = snd_compr_poll, | |
884 | }; | |
885 | ||
886 | static int snd_compress_dev_register(struct snd_device *device) | |
887 | { | |
888 | int ret = -EINVAL; | |
889 | char str[16]; | |
890 | struct snd_compr *compr; | |
891 | ||
892 | if (snd_BUG_ON(!device || !device->device_data)) | |
893 | return -EBADFD; | |
894 | compr = device->device_data; | |
895 | ||
b21c60a4 VK |
896 | pr_debug("reg %s for device %s, direction %d\n", str, compr->name, |
897 | compr->direction); | |
898 | /* register compressed device */ | |
40a4b263 TI |
899 | ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, |
900 | compr->card, compr->device, | |
901 | &snd_compr_file_ops, compr, &compr->dev); | |
b21c60a4 VK |
902 | if (ret < 0) { |
903 | pr_err("snd_register_device failed\n %d", ret); | |
904 | return ret; | |
905 | } | |
906 | return ret; | |
907 | ||
908 | } | |
909 | ||
910 | static int snd_compress_dev_disconnect(struct snd_device *device) | |
911 | { | |
912 | struct snd_compr *compr; | |
913 | ||
914 | compr = device->device_data; | |
40a4b263 | 915 | snd_unregister_device(&compr->dev); |
b21c60a4 VK |
916 | return 0; |
917 | } | |
918 | ||
31742724 RF |
919 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
920 | static void snd_compress_proc_info_read(struct snd_info_entry *entry, | |
921 | struct snd_info_buffer *buffer) | |
922 | { | |
923 | struct snd_compr *compr = (struct snd_compr *)entry->private_data; | |
924 | ||
925 | snd_iprintf(buffer, "card: %d\n", compr->card->number); | |
926 | snd_iprintf(buffer, "device: %d\n", compr->device); | |
927 | snd_iprintf(buffer, "stream: %s\n", | |
928 | compr->direction == SND_COMPRESS_PLAYBACK | |
929 | ? "PLAYBACK" : "CAPTURE"); | |
930 | snd_iprintf(buffer, "id: %s\n", compr->id); | |
931 | } | |
932 | ||
933 | static int snd_compress_proc_init(struct snd_compr *compr) | |
934 | { | |
935 | struct snd_info_entry *entry; | |
936 | char name[16]; | |
937 | ||
938 | sprintf(name, "compr%i", compr->device); | |
939 | entry = snd_info_create_card_entry(compr->card, name, | |
940 | compr->card->proc_root); | |
941 | if (!entry) | |
942 | return -ENOMEM; | |
943 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
944 | if (snd_info_register(entry) < 0) { | |
945 | snd_info_free_entry(entry); | |
946 | return -ENOMEM; | |
947 | } | |
948 | compr->proc_root = entry; | |
949 | ||
950 | entry = snd_info_create_card_entry(compr->card, "info", | |
951 | compr->proc_root); | |
952 | if (entry) { | |
953 | snd_info_set_text_ops(entry, compr, | |
954 | snd_compress_proc_info_read); | |
955 | if (snd_info_register(entry) < 0) { | |
956 | snd_info_free_entry(entry); | |
957 | entry = NULL; | |
958 | } | |
959 | } | |
960 | compr->proc_info_entry = entry; | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | static void snd_compress_proc_done(struct snd_compr *compr) | |
966 | { | |
967 | snd_info_free_entry(compr->proc_info_entry); | |
968 | compr->proc_info_entry = NULL; | |
969 | snd_info_free_entry(compr->proc_root); | |
970 | compr->proc_root = NULL; | |
971 | } | |
e5241a8c RF |
972 | |
973 | static inline void snd_compress_set_id(struct snd_compr *compr, const char *id) | |
974 | { | |
975 | strlcpy(compr->id, id, sizeof(compr->id)); | |
976 | } | |
31742724 RF |
977 | #else |
978 | static inline int snd_compress_proc_init(struct snd_compr *compr) | |
979 | { | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static inline void snd_compress_proc_done(struct snd_compr *compr) | |
984 | { | |
985 | } | |
e5241a8c RF |
986 | |
987 | static inline void snd_compress_set_id(struct snd_compr *compr, const char *id) | |
988 | { | |
989 | } | |
31742724 RF |
990 | #endif |
991 | ||
04c5d5a4 TI |
992 | static int snd_compress_dev_free(struct snd_device *device) |
993 | { | |
994 | struct snd_compr *compr; | |
995 | ||
996 | compr = device->device_data; | |
31742724 | 997 | snd_compress_proc_done(compr); |
04c5d5a4 TI |
998 | put_device(&compr->dev); |
999 | return 0; | |
1000 | } | |
1001 | ||
b21c60a4 VK |
1002 | /* |
1003 | * snd_compress_new: create new compress device | |
1004 | * @card: sound card pointer | |
1005 | * @device: device number | |
1006 | * @dirn: device direction, should be of type enum snd_compr_direction | |
1007 | * @compr: compress device pointer | |
1008 | */ | |
1009 | int snd_compress_new(struct snd_card *card, int device, | |
e5241a8c | 1010 | int dirn, const char *id, struct snd_compr *compr) |
b21c60a4 VK |
1011 | { |
1012 | static struct snd_device_ops ops = { | |
04c5d5a4 | 1013 | .dev_free = snd_compress_dev_free, |
b21c60a4 VK |
1014 | .dev_register = snd_compress_dev_register, |
1015 | .dev_disconnect = snd_compress_dev_disconnect, | |
1016 | }; | |
31742724 | 1017 | int ret; |
b21c60a4 VK |
1018 | |
1019 | compr->card = card; | |
1020 | compr->device = device; | |
1021 | compr->direction = dirn; | |
04c5d5a4 | 1022 | |
e5241a8c RF |
1023 | snd_compress_set_id(compr, id); |
1024 | ||
04c5d5a4 TI |
1025 | snd_device_initialize(&compr->dev, card); |
1026 | dev_set_name(&compr->dev, "comprC%iD%i", card->number, device); | |
1027 | ||
31742724 RF |
1028 | ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops); |
1029 | if (ret == 0) | |
1030 | snd_compress_proc_init(compr); | |
1031 | ||
1032 | return ret; | |
b21c60a4 VK |
1033 | } |
1034 | EXPORT_SYMBOL_GPL(snd_compress_new); | |
1035 | ||
1036 | static int snd_compress_add_device(struct snd_compr *device) | |
1037 | { | |
1038 | int ret; | |
1039 | ||
1040 | if (!device->card) | |
1041 | return -EINVAL; | |
1042 | ||
1043 | /* register the card */ | |
1044 | ret = snd_card_register(device->card); | |
1045 | if (ret) | |
1046 | goto out; | |
1047 | return 0; | |
1048 | ||
1049 | out: | |
1050 | pr_err("failed with %d\n", ret); | |
1051 | return ret; | |
1052 | ||
1053 | } | |
1054 | ||
1055 | static int snd_compress_remove_device(struct snd_compr *device) | |
1056 | { | |
1057 | return snd_card_free(device->card); | |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * snd_compress_register - register compressed device | |
1062 | * | |
1063 | * @device: compressed device to register | |
1064 | */ | |
1065 | int snd_compress_register(struct snd_compr *device) | |
1066 | { | |
1067 | int retval; | |
1068 | ||
04c5d5a4 | 1069 | if (device->name == NULL || device->ops == NULL) |
b21c60a4 VK |
1070 | return -EINVAL; |
1071 | ||
1072 | pr_debug("Registering compressed device %s\n", device->name); | |
1073 | if (snd_BUG_ON(!device->ops->open)) | |
1074 | return -EINVAL; | |
1075 | if (snd_BUG_ON(!device->ops->free)) | |
1076 | return -EINVAL; | |
1077 | if (snd_BUG_ON(!device->ops->set_params)) | |
1078 | return -EINVAL; | |
1079 | if (snd_BUG_ON(!device->ops->trigger)) | |
1080 | return -EINVAL; | |
1081 | ||
1082 | mutex_init(&device->lock); | |
1083 | ||
1084 | /* register a compressed card */ | |
1085 | mutex_lock(&device_mutex); | |
1086 | retval = snd_compress_add_device(device); | |
1087 | mutex_unlock(&device_mutex); | |
1088 | return retval; | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(snd_compress_register); | |
1091 | ||
1092 | int snd_compress_deregister(struct snd_compr *device) | |
1093 | { | |
1094 | pr_debug("Removing compressed device %s\n", device->name); | |
1095 | mutex_lock(&device_mutex); | |
1096 | snd_compress_remove_device(device); | |
1097 | mutex_unlock(&device_mutex); | |
1098 | return 0; | |
1099 | } | |
1100 | EXPORT_SYMBOL_GPL(snd_compress_deregister); | |
1101 | ||
1102 | static int __init snd_compress_init(void) | |
1103 | { | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | static void __exit snd_compress_exit(void) | |
1108 | { | |
1109 | } | |
1110 | ||
1111 | module_init(snd_compress_init); | |
1112 | module_exit(snd_compress_exit); | |
1113 | ||
1114 | MODULE_DESCRIPTION("ALSA Compressed offload framework"); | |
1115 | MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>"); | |
1116 | MODULE_LICENSE("GPL v2"); |