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 | ||
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: | |
41eb94fd | 72 | * we use following states in the compressed core |
b21c60a4 VK |
73 | * SNDRV_PCM_STATE_OPEN: When stream has been opened. |
74 | * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by | |
41eb94fd | 75 | * calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this |
b21c60a4 | 76 | * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain. |
862bca5d VK |
77 | * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for |
78 | * playback only). User after setting up stream writes the data buffer | |
79 | * before starting the stream. | |
b21c60a4 VK |
80 | * SNDRV_PCM_STATE_RUNNING: When stream has been started and is |
81 | * decoding/encoding and rendering/capturing data. | |
82 | * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done | |
83 | * by calling SNDRV_COMPRESS_DRAIN. | |
84 | * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling | |
85 | * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling | |
86 | * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively. | |
87 | */ | |
88 | static int snd_compr_open(struct inode *inode, struct file *f) | |
89 | { | |
90 | struct snd_compr *compr; | |
91 | struct snd_compr_file *data; | |
92 | struct snd_compr_runtime *runtime; | |
93 | enum snd_compr_direction dirn; | |
94 | int maj = imajor(inode); | |
95 | int ret; | |
96 | ||
81cb3246 | 97 | if ((f->f_flags & O_ACCMODE) == O_WRONLY) |
b21c60a4 | 98 | dirn = SND_COMPRESS_PLAYBACK; |
81cb3246 | 99 | else if ((f->f_flags & O_ACCMODE) == O_RDONLY) |
b21c60a4 | 100 | dirn = SND_COMPRESS_CAPTURE; |
81cb3246 | 101 | else |
b21c60a4 | 102 | return -EINVAL; |
b21c60a4 VK |
103 | |
104 | if (maj == snd_major) | |
105 | compr = snd_lookup_minor_data(iminor(inode), | |
106 | SNDRV_DEVICE_TYPE_COMPRESS); | |
107 | else | |
108 | return -EBADFD; | |
109 | ||
110 | if (compr == NULL) { | |
111 | pr_err("no device data!!!\n"); | |
112 | return -ENODEV; | |
113 | } | |
114 | ||
115 | if (dirn != compr->direction) { | |
116 | pr_err("this device doesn't support this direction\n"); | |
a0830dbd | 117 | snd_card_unref(compr->card); |
b21c60a4 VK |
118 | return -EINVAL; |
119 | } | |
120 | ||
121 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
a0830dbd TI |
122 | if (!data) { |
123 | snd_card_unref(compr->card); | |
b21c60a4 | 124 | return -ENOMEM; |
a0830dbd | 125 | } |
b21c60a4 VK |
126 | data->stream.ops = compr->ops; |
127 | data->stream.direction = dirn; | |
128 | data->stream.private_data = compr->private_data; | |
129 | data->stream.device = compr; | |
130 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); | |
131 | if (!runtime) { | |
132 | kfree(data); | |
a0830dbd | 133 | snd_card_unref(compr->card); |
b21c60a4 VK |
134 | return -ENOMEM; |
135 | } | |
136 | runtime->state = SNDRV_PCM_STATE_OPEN; | |
137 | init_waitqueue_head(&runtime->sleep); | |
138 | data->stream.runtime = runtime; | |
139 | f->private_data = (void *)data; | |
140 | mutex_lock(&compr->lock); | |
141 | ret = compr->ops->open(&data->stream); | |
142 | mutex_unlock(&compr->lock); | |
143 | if (ret) { | |
144 | kfree(runtime); | |
145 | kfree(data); | |
146 | } | |
a0830dbd | 147 | snd_card_unref(compr->card); |
749d3223 | 148 | return ret; |
b21c60a4 VK |
149 | } |
150 | ||
151 | static int snd_compr_free(struct inode *inode, struct file *f) | |
152 | { | |
153 | struct snd_compr_file *data = f->private_data; | |
b26d19e4 LG |
154 | struct snd_compr_runtime *runtime = data->stream.runtime; |
155 | ||
156 | switch (runtime->state) { | |
157 | case SNDRV_PCM_STATE_RUNNING: | |
158 | case SNDRV_PCM_STATE_DRAINING: | |
159 | case SNDRV_PCM_STATE_PAUSED: | |
160 | data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP); | |
161 | break; | |
162 | default: | |
163 | break; | |
164 | } | |
165 | ||
b21c60a4 VK |
166 | data->stream.ops->free(&data->stream); |
167 | kfree(data->stream.runtime->buffer); | |
168 | kfree(data->stream.runtime); | |
169 | kfree(data); | |
170 | return 0; | |
171 | } | |
172 | ||
17ac8e5c | 173 | static int snd_compr_update_tstamp(struct snd_compr_stream *stream, |
b21c60a4 VK |
174 | struct snd_compr_tstamp *tstamp) |
175 | { | |
176 | if (!stream->ops->pointer) | |
17ac8e5c | 177 | return -ENOTSUPP; |
b21c60a4 VK |
178 | stream->ops->pointer(stream, tstamp); |
179 | pr_debug("dsp consumed till %d total %d bytes\n", | |
180 | tstamp->byte_offset, tstamp->copied_total); | |
5b1f79f7 CK |
181 | if (stream->direction == SND_COMPRESS_PLAYBACK) |
182 | stream->runtime->total_bytes_transferred = tstamp->copied_total; | |
183 | else | |
184 | stream->runtime->total_bytes_available = tstamp->copied_total; | |
17ac8e5c | 185 | return 0; |
b21c60a4 VK |
186 | } |
187 | ||
188 | static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, | |
189 | struct snd_compr_avail *avail) | |
190 | { | |
17ac8e5c | 191 | memset(avail, 0, sizeof(*avail)); |
b21c60a4 | 192 | snd_compr_update_tstamp(stream, &avail->tstamp); |
17ac8e5c | 193 | /* Still need to return avail even if tstamp can't be filled in */ |
b21c60a4 | 194 | |
b21c60a4 | 195 | if (stream->runtime->total_bytes_available == 0 && |
5b1f79f7 CK |
196 | stream->runtime->state == SNDRV_PCM_STATE_SETUP && |
197 | stream->direction == SND_COMPRESS_PLAYBACK) { | |
b21c60a4 VK |
198 | pr_debug("detected init and someone forgot to do a write\n"); |
199 | return stream->runtime->buffer_size; | |
200 | } | |
201 | pr_debug("app wrote %lld, DSP consumed %lld\n", | |
202 | stream->runtime->total_bytes_available, | |
203 | stream->runtime->total_bytes_transferred); | |
204 | if (stream->runtime->total_bytes_available == | |
205 | stream->runtime->total_bytes_transferred) { | |
5b1f79f7 CK |
206 | if (stream->direction == SND_COMPRESS_PLAYBACK) { |
207 | pr_debug("both pointers are same, returning full avail\n"); | |
208 | return stream->runtime->buffer_size; | |
209 | } else { | |
210 | pr_debug("both pointers are same, returning no avail\n"); | |
211 | return 0; | |
212 | } | |
b21c60a4 VK |
213 | } |
214 | ||
5b1f79f7 CK |
215 | avail->avail = stream->runtime->total_bytes_available - |
216 | stream->runtime->total_bytes_transferred; | |
217 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
218 | avail->avail = stream->runtime->buffer_size - avail->avail; | |
219 | ||
4c28e32d CK |
220 | pr_debug("ret avail as %lld\n", avail->avail); |
221 | return avail->avail; | |
b21c60a4 VK |
222 | } |
223 | ||
224 | static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) | |
225 | { | |
226 | struct snd_compr_avail avail; | |
227 | ||
228 | return snd_compr_calc_avail(stream, &avail); | |
229 | } | |
230 | ||
231 | static int | |
232 | snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) | |
233 | { | |
234 | struct snd_compr_avail ioctl_avail; | |
235 | size_t avail; | |
236 | ||
237 | avail = snd_compr_calc_avail(stream, &ioctl_avail); | |
238 | ioctl_avail.avail = avail; | |
239 | ||
240 | if (copy_to_user((__u64 __user *)arg, | |
241 | &ioctl_avail, sizeof(ioctl_avail))) | |
242 | return -EFAULT; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int snd_compr_write_data(struct snd_compr_stream *stream, | |
247 | const char __user *buf, size_t count) | |
248 | { | |
249 | void *dstn; | |
250 | size_t copy; | |
251 | struct snd_compr_runtime *runtime = stream->runtime; | |
f0283b58 CK |
252 | /* 64-bit Modulus */ |
253 | u64 app_pointer = div64_u64(runtime->total_bytes_available, | |
254 | runtime->buffer_size); | |
255 | app_pointer = runtime->total_bytes_available - | |
256 | (app_pointer * runtime->buffer_size); | |
b21c60a4 | 257 | |
f0283b58 | 258 | dstn = runtime->buffer + app_pointer; |
b21c60a4 | 259 | pr_debug("copying %ld at %lld\n", |
f0283b58 CK |
260 | (unsigned long)count, app_pointer); |
261 | if (count < runtime->buffer_size - app_pointer) { | |
b21c60a4 VK |
262 | if (copy_from_user(dstn, buf, count)) |
263 | return -EFAULT; | |
b21c60a4 | 264 | } else { |
f0283b58 | 265 | copy = runtime->buffer_size - app_pointer; |
b21c60a4 VK |
266 | if (copy_from_user(dstn, buf, copy)) |
267 | return -EFAULT; | |
268 | if (copy_from_user(runtime->buffer, buf + copy, count - copy)) | |
269 | return -EFAULT; | |
b21c60a4 VK |
270 | } |
271 | /* if DSP cares, let it know data has been written */ | |
272 | if (stream->ops->ack) | |
273 | stream->ops->ack(stream, count); | |
274 | return count; | |
275 | } | |
276 | ||
277 | static ssize_t snd_compr_write(struct file *f, const char __user *buf, | |
278 | size_t count, loff_t *offset) | |
279 | { | |
280 | struct snd_compr_file *data = f->private_data; | |
281 | struct snd_compr_stream *stream; | |
282 | size_t avail; | |
283 | int retval; | |
284 | ||
285 | if (snd_BUG_ON(!data)) | |
286 | return -EFAULT; | |
287 | ||
288 | stream = &data->stream; | |
289 | mutex_lock(&stream->device->lock); | |
290 | /* write is allowed when stream is running or has been steup */ | |
291 | if (stream->runtime->state != SNDRV_PCM_STATE_SETUP && | |
35383a24 | 292 | stream->runtime->state != SNDRV_PCM_STATE_PREPARED && |
b21c60a4 VK |
293 | stream->runtime->state != SNDRV_PCM_STATE_RUNNING) { |
294 | mutex_unlock(&stream->device->lock); | |
295 | return -EBADFD; | |
296 | } | |
297 | ||
298 | avail = snd_compr_get_avail(stream); | |
299 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
300 | /* calculate how much we can write to buffer */ | |
301 | if (avail > count) | |
302 | avail = count; | |
303 | ||
4daf891c CK |
304 | if (stream->ops->copy) { |
305 | char __user* cbuf = (char __user*)buf; | |
306 | retval = stream->ops->copy(stream, cbuf, avail); | |
307 | } else { | |
b21c60a4 | 308 | retval = snd_compr_write_data(stream, buf, avail); |
4daf891c | 309 | } |
b21c60a4 VK |
310 | if (retval > 0) |
311 | stream->runtime->total_bytes_available += retval; | |
312 | ||
313 | /* while initiating the stream, write should be called before START | |
314 | * call, so in setup move state */ | |
315 | if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) { | |
316 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
317 | pr_debug("stream prepared, Houston we are good to go\n"); | |
318 | } | |
319 | ||
320 | mutex_unlock(&stream->device->lock); | |
321 | return retval; | |
322 | } | |
323 | ||
324 | ||
325 | static ssize_t snd_compr_read(struct file *f, char __user *buf, | |
326 | size_t count, loff_t *offset) | |
327 | { | |
49bb6402 CK |
328 | struct snd_compr_file *data = f->private_data; |
329 | struct snd_compr_stream *stream; | |
330 | size_t avail; | |
331 | int retval; | |
332 | ||
333 | if (snd_BUG_ON(!data)) | |
334 | return -EFAULT; | |
335 | ||
336 | stream = &data->stream; | |
337 | mutex_lock(&stream->device->lock); | |
338 | ||
75481347 VK |
339 | /* read is allowed when stream is running, paused, draining and setup |
340 | * (yes setup is state which we transition to after stop, so if user | |
341 | * wants to read data after stop we allow that) | |
342 | */ | |
343 | switch (stream->runtime->state) { | |
344 | case SNDRV_PCM_STATE_OPEN: | |
345 | case SNDRV_PCM_STATE_PREPARED: | |
346 | case SNDRV_PCM_STATE_XRUN: | |
347 | case SNDRV_PCM_STATE_SUSPENDED: | |
348 | case SNDRV_PCM_STATE_DISCONNECTED: | |
49bb6402 CK |
349 | retval = -EBADFD; |
350 | goto out; | |
351 | } | |
352 | ||
353 | avail = snd_compr_get_avail(stream); | |
354 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
355 | /* calculate how much we can read from buffer */ | |
356 | if (avail > count) | |
357 | avail = count; | |
358 | ||
359 | if (stream->ops->copy) { | |
360 | retval = stream->ops->copy(stream, buf, avail); | |
361 | } else { | |
362 | retval = -ENXIO; | |
363 | goto out; | |
364 | } | |
365 | if (retval > 0) | |
366 | stream->runtime->total_bytes_transferred += retval; | |
367 | ||
368 | out: | |
369 | mutex_unlock(&stream->device->lock); | |
370 | return retval; | |
b21c60a4 VK |
371 | } |
372 | ||
373 | static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) | |
374 | { | |
375 | return -ENXIO; | |
376 | } | |
377 | ||
378 | static inline int snd_compr_get_poll(struct snd_compr_stream *stream) | |
379 | { | |
380 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
381 | return POLLOUT | POLLWRNORM; | |
382 | else | |
383 | return POLLIN | POLLRDNORM; | |
384 | } | |
385 | ||
386 | static unsigned int snd_compr_poll(struct file *f, poll_table *wait) | |
387 | { | |
388 | struct snd_compr_file *data = f->private_data; | |
389 | struct snd_compr_stream *stream; | |
390 | size_t avail; | |
391 | int retval = 0; | |
392 | ||
393 | if (snd_BUG_ON(!data)) | |
394 | return -EFAULT; | |
395 | stream = &data->stream; | |
396 | if (snd_BUG_ON(!stream)) | |
397 | return -EFAULT; | |
398 | ||
399 | mutex_lock(&stream->device->lock); | |
c15b149a | 400 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { |
b21c60a4 VK |
401 | retval = -EBADFD; |
402 | goto out; | |
403 | } | |
404 | poll_wait(f, &stream->runtime->sleep, wait); | |
405 | ||
406 | avail = snd_compr_get_avail(stream); | |
407 | pr_debug("avail is %ld\n", (unsigned long)avail); | |
408 | /* check if we have at least one fragment to fill */ | |
409 | switch (stream->runtime->state) { | |
410 | case SNDRV_PCM_STATE_DRAINING: | |
411 | /* stream has been woken up after drain is complete | |
412 | * draining done so set stream state to stopped | |
413 | */ | |
414 | retval = snd_compr_get_poll(stream); | |
415 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
416 | break; | |
417 | case SNDRV_PCM_STATE_RUNNING: | |
418 | case SNDRV_PCM_STATE_PREPARED: | |
419 | case SNDRV_PCM_STATE_PAUSED: | |
420 | if (avail >= stream->runtime->fragment_size) | |
421 | retval = snd_compr_get_poll(stream); | |
422 | break; | |
423 | default: | |
424 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
425 | retval = POLLOUT | POLLWRNORM | POLLERR; | |
426 | else | |
427 | retval = POLLIN | POLLRDNORM | POLLERR; | |
428 | break; | |
429 | } | |
430 | out: | |
431 | mutex_unlock(&stream->device->lock); | |
432 | return retval; | |
433 | } | |
434 | ||
435 | static int | |
436 | snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg) | |
437 | { | |
438 | int retval; | |
439 | struct snd_compr_caps caps; | |
440 | ||
441 | if (!stream->ops->get_caps) | |
442 | return -ENXIO; | |
443 | ||
1c62e9f2 | 444 | memset(&caps, 0, sizeof(caps)); |
b21c60a4 VK |
445 | retval = stream->ops->get_caps(stream, &caps); |
446 | if (retval) | |
447 | goto out; | |
448 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) | |
449 | retval = -EFAULT; | |
450 | out: | |
451 | return retval; | |
452 | } | |
453 | ||
462b3f16 | 454 | #ifndef COMPR_CODEC_CAPS_OVERFLOW |
b21c60a4 VK |
455 | static int |
456 | snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg) | |
457 | { | |
458 | int retval; | |
459 | struct snd_compr_codec_caps *caps; | |
460 | ||
461 | if (!stream->ops->get_codec_caps) | |
462 | return -ENXIO; | |
463 | ||
47966e97 | 464 | caps = kzalloc(sizeof(*caps), GFP_KERNEL); |
b21c60a4 VK |
465 | if (!caps) |
466 | return -ENOMEM; | |
467 | ||
468 | retval = stream->ops->get_codec_caps(stream, caps); | |
469 | if (retval) | |
470 | goto out; | |
471 | if (copy_to_user((void __user *)arg, caps, sizeof(*caps))) | |
472 | retval = -EFAULT; | |
473 | ||
474 | out: | |
475 | kfree(caps); | |
476 | return retval; | |
477 | } | |
462b3f16 | 478 | #endif /* !COMPR_CODEC_CAPS_OVERFLOW */ |
b21c60a4 VK |
479 | |
480 | /* revisit this with snd_pcm_preallocate_xxx */ | |
481 | static int snd_compr_allocate_buffer(struct snd_compr_stream *stream, | |
482 | struct snd_compr_params *params) | |
483 | { | |
484 | unsigned int buffer_size; | |
485 | void *buffer; | |
486 | ||
487 | buffer_size = params->buffer.fragment_size * params->buffer.fragments; | |
488 | if (stream->ops->copy) { | |
489 | buffer = NULL; | |
490 | /* if copy is defined the driver will be required to copy | |
491 | * the data from core | |
492 | */ | |
493 | } else { | |
494 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
495 | if (!buffer) | |
496 | return -ENOMEM; | |
497 | } | |
498 | stream->runtime->fragment_size = params->buffer.fragment_size; | |
499 | stream->runtime->fragments = params->buffer.fragments; | |
500 | stream->runtime->buffer = buffer; | |
501 | stream->runtime->buffer_size = buffer_size; | |
502 | return 0; | |
503 | } | |
504 | ||
4dc040a0 VK |
505 | static int snd_compress_check_input(struct snd_compr_params *params) |
506 | { | |
507 | /* first let's check the buffer parameter's */ | |
508 | if (params->buffer.fragment_size == 0 || | |
6217e5ed | 509 | params->buffer.fragments > INT_MAX / params->buffer.fragment_size) |
4dc040a0 VK |
510 | return -EINVAL; |
511 | ||
fb4a9779 VK |
512 | /* now codec parameters */ |
513 | if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX) | |
514 | return -EINVAL; | |
515 | ||
516 | if (params->codec.ch_in == 0 || params->codec.ch_out == 0) | |
517 | return -EINVAL; | |
fb4a9779 | 518 | |
4dc040a0 VK |
519 | return 0; |
520 | } | |
521 | ||
b21c60a4 VK |
522 | static int |
523 | snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) | |
524 | { | |
525 | struct snd_compr_params *params; | |
526 | int retval; | |
527 | ||
528 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { | |
529 | /* | |
530 | * we should allow parameter change only when stream has been | |
531 | * opened not in other cases | |
532 | */ | |
533 | params = kmalloc(sizeof(*params), GFP_KERNEL); | |
534 | if (!params) | |
535 | return -ENOMEM; | |
769fab2a JJ |
536 | if (copy_from_user(params, (void __user *)arg, sizeof(*params))) { |
537 | retval = -EFAULT; | |
538 | goto out; | |
539 | } | |
4dc040a0 VK |
540 | |
541 | retval = snd_compress_check_input(params); | |
542 | if (retval) | |
543 | goto out; | |
544 | ||
b21c60a4 VK |
545 | retval = snd_compr_allocate_buffer(stream, params); |
546 | if (retval) { | |
769fab2a JJ |
547 | retval = -ENOMEM; |
548 | goto out; | |
b21c60a4 | 549 | } |
4dc040a0 | 550 | |
b21c60a4 VK |
551 | retval = stream->ops->set_params(stream, params); |
552 | if (retval) | |
553 | goto out; | |
49bb6402 | 554 | |
9727b490 JK |
555 | stream->metadata_set = false; |
556 | stream->next_track = false; | |
49bb6402 CK |
557 | |
558 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
559 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
560 | else | |
561 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
769fab2a | 562 | } else { |
b21c60a4 | 563 | return -EPERM; |
769fab2a | 564 | } |
b21c60a4 VK |
565 | out: |
566 | kfree(params); | |
567 | return retval; | |
568 | } | |
569 | ||
570 | static int | |
571 | snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg) | |
572 | { | |
573 | struct snd_codec *params; | |
574 | int retval; | |
575 | ||
576 | if (!stream->ops->get_params) | |
577 | return -EBADFD; | |
578 | ||
47966e97 | 579 | params = kzalloc(sizeof(*params), GFP_KERNEL); |
b21c60a4 VK |
580 | if (!params) |
581 | return -ENOMEM; | |
582 | retval = stream->ops->get_params(stream, params); | |
583 | if (retval) | |
584 | goto out; | |
585 | if (copy_to_user((char __user *)arg, params, sizeof(*params))) | |
586 | retval = -EFAULT; | |
587 | ||
588 | out: | |
589 | kfree(params); | |
590 | return retval; | |
591 | } | |
592 | ||
9727b490 JK |
593 | static int |
594 | snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
595 | { | |
596 | struct snd_compr_metadata metadata; | |
597 | int retval; | |
598 | ||
599 | if (!stream->ops->get_metadata) | |
600 | return -ENXIO; | |
601 | ||
602 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
603 | return -EFAULT; | |
604 | ||
605 | retval = stream->ops->get_metadata(stream, &metadata); | |
606 | if (retval != 0) | |
607 | return retval; | |
608 | ||
609 | if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata))) | |
610 | return -EFAULT; | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static int | |
616 | snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
617 | { | |
618 | struct snd_compr_metadata metadata; | |
619 | int retval; | |
620 | ||
621 | if (!stream->ops->set_metadata) | |
622 | return -ENXIO; | |
623 | /* | |
624 | * we should allow parameter change only when stream has been | |
625 | * opened not in other cases | |
626 | */ | |
627 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
628 | return -EFAULT; | |
629 | ||
630 | retval = stream->ops->set_metadata(stream, &metadata); | |
631 | stream->metadata_set = true; | |
632 | ||
633 | return retval; | |
634 | } | |
635 | ||
b21c60a4 VK |
636 | static inline int |
637 | snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg) | |
638 | { | |
17ac8e5c RF |
639 | struct snd_compr_tstamp tstamp = {0}; |
640 | int ret; | |
b21c60a4 | 641 | |
17ac8e5c RF |
642 | ret = snd_compr_update_tstamp(stream, &tstamp); |
643 | if (ret == 0) | |
644 | ret = copy_to_user((struct snd_compr_tstamp __user *)arg, | |
645 | &tstamp, sizeof(tstamp)) ? -EFAULT : 0; | |
646 | return ret; | |
b21c60a4 VK |
647 | } |
648 | ||
649 | static int snd_compr_pause(struct snd_compr_stream *stream) | |
650 | { | |
651 | int retval; | |
652 | ||
653 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
654 | return -EPERM; | |
655 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); | |
6b18f793 | 656 | if (!retval) |
b21c60a4 | 657 | stream->runtime->state = SNDRV_PCM_STATE_PAUSED; |
b21c60a4 VK |
658 | return retval; |
659 | } | |
660 | ||
661 | static int snd_compr_resume(struct snd_compr_stream *stream) | |
662 | { | |
663 | int retval; | |
664 | ||
665 | if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED) | |
666 | return -EPERM; | |
667 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); | |
668 | if (!retval) | |
669 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
670 | return retval; | |
671 | } | |
672 | ||
673 | static int snd_compr_start(struct snd_compr_stream *stream) | |
674 | { | |
675 | int retval; | |
676 | ||
677 | if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED) | |
678 | return -EPERM; | |
679 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START); | |
680 | if (!retval) | |
681 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
682 | return retval; | |
683 | } | |
684 | ||
685 | static int snd_compr_stop(struct snd_compr_stream *stream) | |
686 | { | |
687 | int retval; | |
688 | ||
689 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
690 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
691 | return -EPERM; | |
692 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP); | |
693 | if (!retval) { | |
917f4b5c | 694 | snd_compr_drain_notify(stream); |
8b21460a VK |
695 | stream->runtime->total_bytes_available = 0; |
696 | stream->runtime->total_bytes_transferred = 0; | |
b21c60a4 VK |
697 | } |
698 | return retval; | |
699 | } | |
700 | ||
917f4b5c VK |
701 | static int snd_compress_wait_for_drain(struct snd_compr_stream *stream) |
702 | { | |
f44f2a54 VK |
703 | int ret; |
704 | ||
917f4b5c VK |
705 | /* |
706 | * We are called with lock held. So drop the lock while we wait for | |
cdb1ee3f | 707 | * drain complete notification from the driver |
917f4b5c VK |
708 | * |
709 | * It is expected that driver will notify the drain completion and then | |
710 | * stream will be moved to SETUP state, even if draining resulted in an | |
711 | * error. We can trigger next track after this. | |
712 | */ | |
713 | stream->runtime->state = SNDRV_PCM_STATE_DRAINING; | |
714 | mutex_unlock(&stream->device->lock); | |
715 | ||
f44f2a54 VK |
716 | /* we wait for drain to complete here, drain can return when |
717 | * interruption occurred, wait returned error or success. | |
718 | * For the first two cases we don't do anything different here and | |
719 | * return after waking up | |
720 | */ | |
721 | ||
722 | ret = wait_event_interruptible(stream->runtime->sleep, | |
723 | (stream->runtime->state != SNDRV_PCM_STATE_DRAINING)); | |
724 | if (ret == -ERESTARTSYS) | |
725 | pr_debug("wait aborted by a signal"); | |
726 | else if (ret) | |
727 | pr_debug("wait for drain failed with %d\n", ret); | |
728 | ||
917f4b5c VK |
729 | |
730 | wake_up(&stream->runtime->sleep); | |
731 | mutex_lock(&stream->device->lock); | |
732 | ||
f44f2a54 | 733 | return ret; |
917f4b5c VK |
734 | } |
735 | ||
b21c60a4 VK |
736 | static int snd_compr_drain(struct snd_compr_stream *stream) |
737 | { | |
738 | int retval; | |
739 | ||
740 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
741 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
742 | return -EPERM; | |
917f4b5c | 743 | |
b21c60a4 | 744 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN); |
917f4b5c | 745 | if (retval) { |
f44f2a54 | 746 | pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval); |
b21c60a4 | 747 | wake_up(&stream->runtime->sleep); |
917f4b5c | 748 | return retval; |
b21c60a4 | 749 | } |
917f4b5c | 750 | |
f44f2a54 | 751 | return snd_compress_wait_for_drain(stream); |
b21c60a4 VK |
752 | } |
753 | ||
9727b490 JK |
754 | static int snd_compr_next_track(struct snd_compr_stream *stream) |
755 | { | |
756 | int retval; | |
757 | ||
758 | /* only a running stream can transition to next track */ | |
759 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
760 | return -EPERM; | |
761 | ||
cdb1ee3f | 762 | /* you can signal next track if this is intended to be a gapless stream |
9727b490 JK |
763 | * and current track metadata is set |
764 | */ | |
765 | if (stream->metadata_set == false) | |
766 | return -EPERM; | |
767 | ||
768 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK); | |
769 | if (retval != 0) | |
770 | return retval; | |
771 | stream->metadata_set = false; | |
772 | stream->next_track = true; | |
773 | return 0; | |
774 | } | |
775 | ||
776 | static int snd_compr_partial_drain(struct snd_compr_stream *stream) | |
777 | { | |
778 | int retval; | |
779 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
780 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
781 | return -EPERM; | |
782 | /* stream can be drained only when next track has been signalled */ | |
783 | if (stream->next_track == false) | |
784 | return -EPERM; | |
785 | ||
786 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN); | |
917f4b5c | 787 | if (retval) { |
f44f2a54 | 788 | pr_debug("Partial drain returned failure\n"); |
917f4b5c VK |
789 | wake_up(&stream->runtime->sleep); |
790 | return retval; | |
791 | } | |
9727b490 JK |
792 | |
793 | stream->next_track = false; | |
917f4b5c | 794 | return snd_compress_wait_for_drain(stream); |
9727b490 JK |
795 | } |
796 | ||
b21c60a4 VK |
797 | static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
798 | { | |
799 | struct snd_compr_file *data = f->private_data; | |
800 | struct snd_compr_stream *stream; | |
801 | int retval = -ENOTTY; | |
802 | ||
803 | if (snd_BUG_ON(!data)) | |
804 | return -EFAULT; | |
805 | stream = &data->stream; | |
806 | if (snd_BUG_ON(!stream)) | |
807 | return -EFAULT; | |
808 | mutex_lock(&stream->device->lock); | |
809 | switch (_IOC_NR(cmd)) { | |
810 | case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION): | |
a8d30608 | 811 | retval = put_user(SNDRV_COMPRESS_VERSION, |
b21c60a4 VK |
812 | (int __user *)arg) ? -EFAULT : 0; |
813 | break; | |
814 | case _IOC_NR(SNDRV_COMPRESS_GET_CAPS): | |
815 | retval = snd_compr_get_caps(stream, arg); | |
816 | break; | |
462b3f16 | 817 | #ifndef COMPR_CODEC_CAPS_OVERFLOW |
b21c60a4 VK |
818 | case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS): |
819 | retval = snd_compr_get_codec_caps(stream, arg); | |
820 | break; | |
462b3f16 | 821 | #endif |
b21c60a4 VK |
822 | case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS): |
823 | retval = snd_compr_set_params(stream, arg); | |
824 | break; | |
825 | case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS): | |
826 | retval = snd_compr_get_params(stream, arg); | |
827 | break; | |
9727b490 JK |
828 | case _IOC_NR(SNDRV_COMPRESS_SET_METADATA): |
829 | retval = snd_compr_set_metadata(stream, arg); | |
830 | break; | |
831 | case _IOC_NR(SNDRV_COMPRESS_GET_METADATA): | |
832 | retval = snd_compr_get_metadata(stream, arg); | |
833 | break; | |
b21c60a4 VK |
834 | case _IOC_NR(SNDRV_COMPRESS_TSTAMP): |
835 | retval = snd_compr_tstamp(stream, arg); | |
836 | break; | |
837 | case _IOC_NR(SNDRV_COMPRESS_AVAIL): | |
838 | retval = snd_compr_ioctl_avail(stream, arg); | |
839 | break; | |
840 | case _IOC_NR(SNDRV_COMPRESS_PAUSE): | |
841 | retval = snd_compr_pause(stream); | |
842 | break; | |
843 | case _IOC_NR(SNDRV_COMPRESS_RESUME): | |
844 | retval = snd_compr_resume(stream); | |
845 | break; | |
846 | case _IOC_NR(SNDRV_COMPRESS_START): | |
847 | retval = snd_compr_start(stream); | |
848 | break; | |
849 | case _IOC_NR(SNDRV_COMPRESS_STOP): | |
850 | retval = snd_compr_stop(stream); | |
851 | break; | |
852 | case _IOC_NR(SNDRV_COMPRESS_DRAIN): | |
853 | retval = snd_compr_drain(stream); | |
854 | break; | |
9727b490 JK |
855 | case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN): |
856 | retval = snd_compr_partial_drain(stream); | |
857 | break; | |
858 | case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK): | |
859 | retval = snd_compr_next_track(stream); | |
860 | break; | |
861 | ||
b21c60a4 VK |
862 | } |
863 | mutex_unlock(&stream->device->lock); | |
864 | return retval; | |
865 | } | |
866 | ||
c1036889 RL |
867 | /* support of 32bit userspace on 64bit platforms */ |
868 | #ifdef CONFIG_COMPAT | |
869 | static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd, | |
870 | unsigned long arg) | |
871 | { | |
872 | return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
873 | } | |
874 | #endif | |
875 | ||
b21c60a4 VK |
876 | static const struct file_operations snd_compr_file_ops = { |
877 | .owner = THIS_MODULE, | |
878 | .open = snd_compr_open, | |
879 | .release = snd_compr_free, | |
880 | .write = snd_compr_write, | |
881 | .read = snd_compr_read, | |
882 | .unlocked_ioctl = snd_compr_ioctl, | |
c1036889 RL |
883 | #ifdef CONFIG_COMPAT |
884 | .compat_ioctl = snd_compr_ioctl_compat, | |
885 | #endif | |
b21c60a4 VK |
886 | .mmap = snd_compr_mmap, |
887 | .poll = snd_compr_poll, | |
888 | }; | |
889 | ||
890 | static int snd_compress_dev_register(struct snd_device *device) | |
891 | { | |
892 | int ret = -EINVAL; | |
893 | char str[16]; | |
894 | struct snd_compr *compr; | |
895 | ||
896 | if (snd_BUG_ON(!device || !device->device_data)) | |
897 | return -EBADFD; | |
898 | compr = device->device_data; | |
899 | ||
b21c60a4 VK |
900 | pr_debug("reg %s for device %s, direction %d\n", str, compr->name, |
901 | compr->direction); | |
902 | /* register compressed device */ | |
40a4b263 TI |
903 | ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, |
904 | compr->card, compr->device, | |
905 | &snd_compr_file_ops, compr, &compr->dev); | |
b21c60a4 VK |
906 | if (ret < 0) { |
907 | pr_err("snd_register_device failed\n %d", ret); | |
908 | return ret; | |
909 | } | |
910 | return ret; | |
911 | ||
912 | } | |
913 | ||
914 | static int snd_compress_dev_disconnect(struct snd_device *device) | |
915 | { | |
916 | struct snd_compr *compr; | |
917 | ||
918 | compr = device->device_data; | |
40a4b263 | 919 | snd_unregister_device(&compr->dev); |
b21c60a4 VK |
920 | return 0; |
921 | } | |
922 | ||
31742724 RF |
923 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
924 | static void snd_compress_proc_info_read(struct snd_info_entry *entry, | |
925 | struct snd_info_buffer *buffer) | |
926 | { | |
927 | struct snd_compr *compr = (struct snd_compr *)entry->private_data; | |
928 | ||
929 | snd_iprintf(buffer, "card: %d\n", compr->card->number); | |
930 | snd_iprintf(buffer, "device: %d\n", compr->device); | |
931 | snd_iprintf(buffer, "stream: %s\n", | |
932 | compr->direction == SND_COMPRESS_PLAYBACK | |
933 | ? "PLAYBACK" : "CAPTURE"); | |
934 | snd_iprintf(buffer, "id: %s\n", compr->id); | |
935 | } | |
936 | ||
937 | static int snd_compress_proc_init(struct snd_compr *compr) | |
938 | { | |
939 | struct snd_info_entry *entry; | |
940 | char name[16]; | |
941 | ||
942 | sprintf(name, "compr%i", compr->device); | |
943 | entry = snd_info_create_card_entry(compr->card, name, | |
944 | compr->card->proc_root); | |
945 | if (!entry) | |
946 | return -ENOMEM; | |
947 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
948 | if (snd_info_register(entry) < 0) { | |
949 | snd_info_free_entry(entry); | |
950 | return -ENOMEM; | |
951 | } | |
952 | compr->proc_root = entry; | |
953 | ||
954 | entry = snd_info_create_card_entry(compr->card, "info", | |
955 | compr->proc_root); | |
956 | if (entry) { | |
957 | snd_info_set_text_ops(entry, compr, | |
958 | snd_compress_proc_info_read); | |
959 | if (snd_info_register(entry) < 0) { | |
960 | snd_info_free_entry(entry); | |
961 | entry = NULL; | |
962 | } | |
963 | } | |
964 | compr->proc_info_entry = entry; | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | static void snd_compress_proc_done(struct snd_compr *compr) | |
970 | { | |
971 | snd_info_free_entry(compr->proc_info_entry); | |
972 | compr->proc_info_entry = NULL; | |
973 | snd_info_free_entry(compr->proc_root); | |
974 | compr->proc_root = NULL; | |
975 | } | |
e5241a8c RF |
976 | |
977 | static inline void snd_compress_set_id(struct snd_compr *compr, const char *id) | |
978 | { | |
979 | strlcpy(compr->id, id, sizeof(compr->id)); | |
980 | } | |
31742724 RF |
981 | #else |
982 | static inline int snd_compress_proc_init(struct snd_compr *compr) | |
983 | { | |
984 | return 0; | |
985 | } | |
986 | ||
987 | static inline void snd_compress_proc_done(struct snd_compr *compr) | |
988 | { | |
989 | } | |
e5241a8c RF |
990 | |
991 | static inline void snd_compress_set_id(struct snd_compr *compr, const char *id) | |
992 | { | |
993 | } | |
31742724 RF |
994 | #endif |
995 | ||
04c5d5a4 TI |
996 | static int snd_compress_dev_free(struct snd_device *device) |
997 | { | |
998 | struct snd_compr *compr; | |
999 | ||
1000 | compr = device->device_data; | |
31742724 | 1001 | snd_compress_proc_done(compr); |
04c5d5a4 TI |
1002 | put_device(&compr->dev); |
1003 | return 0; | |
1004 | } | |
1005 | ||
b21c60a4 VK |
1006 | /* |
1007 | * snd_compress_new: create new compress device | |
1008 | * @card: sound card pointer | |
1009 | * @device: device number | |
1010 | * @dirn: device direction, should be of type enum snd_compr_direction | |
1011 | * @compr: compress device pointer | |
1012 | */ | |
1013 | int snd_compress_new(struct snd_card *card, int device, | |
e5241a8c | 1014 | int dirn, const char *id, struct snd_compr *compr) |
b21c60a4 VK |
1015 | { |
1016 | static struct snd_device_ops ops = { | |
04c5d5a4 | 1017 | .dev_free = snd_compress_dev_free, |
b21c60a4 VK |
1018 | .dev_register = snd_compress_dev_register, |
1019 | .dev_disconnect = snd_compress_dev_disconnect, | |
1020 | }; | |
31742724 | 1021 | int ret; |
b21c60a4 VK |
1022 | |
1023 | compr->card = card; | |
1024 | compr->device = device; | |
1025 | compr->direction = dirn; | |
04c5d5a4 | 1026 | |
e5241a8c RF |
1027 | snd_compress_set_id(compr, id); |
1028 | ||
04c5d5a4 TI |
1029 | snd_device_initialize(&compr->dev, card); |
1030 | dev_set_name(&compr->dev, "comprC%iD%i", card->number, device); | |
1031 | ||
31742724 RF |
1032 | ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops); |
1033 | if (ret == 0) | |
1034 | snd_compress_proc_init(compr); | |
1035 | ||
1036 | return ret; | |
b21c60a4 VK |
1037 | } |
1038 | EXPORT_SYMBOL_GPL(snd_compress_new); | |
1039 | ||
1040 | static int snd_compress_add_device(struct snd_compr *device) | |
1041 | { | |
1042 | int ret; | |
1043 | ||
1044 | if (!device->card) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | /* register the card */ | |
1048 | ret = snd_card_register(device->card); | |
1049 | if (ret) | |
1050 | goto out; | |
1051 | return 0; | |
1052 | ||
1053 | out: | |
1054 | pr_err("failed with %d\n", ret); | |
1055 | return ret; | |
1056 | ||
1057 | } | |
1058 | ||
1059 | static int snd_compress_remove_device(struct snd_compr *device) | |
1060 | { | |
1061 | return snd_card_free(device->card); | |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * snd_compress_register - register compressed device | |
1066 | * | |
1067 | * @device: compressed device to register | |
1068 | */ | |
1069 | int snd_compress_register(struct snd_compr *device) | |
1070 | { | |
1071 | int retval; | |
1072 | ||
04c5d5a4 | 1073 | if (device->name == NULL || device->ops == NULL) |
b21c60a4 VK |
1074 | return -EINVAL; |
1075 | ||
1076 | pr_debug("Registering compressed device %s\n", device->name); | |
1077 | if (snd_BUG_ON(!device->ops->open)) | |
1078 | return -EINVAL; | |
1079 | if (snd_BUG_ON(!device->ops->free)) | |
1080 | return -EINVAL; | |
1081 | if (snd_BUG_ON(!device->ops->set_params)) | |
1082 | return -EINVAL; | |
1083 | if (snd_BUG_ON(!device->ops->trigger)) | |
1084 | return -EINVAL; | |
1085 | ||
1086 | mutex_init(&device->lock); | |
1087 | ||
1088 | /* register a compressed card */ | |
1089 | mutex_lock(&device_mutex); | |
1090 | retval = snd_compress_add_device(device); | |
1091 | mutex_unlock(&device_mutex); | |
1092 | return retval; | |
1093 | } | |
1094 | EXPORT_SYMBOL_GPL(snd_compress_register); | |
1095 | ||
1096 | int snd_compress_deregister(struct snd_compr *device) | |
1097 | { | |
1098 | pr_debug("Removing compressed device %s\n", device->name); | |
1099 | mutex_lock(&device_mutex); | |
1100 | snd_compress_remove_device(device); | |
1101 | mutex_unlock(&device_mutex); | |
1102 | return 0; | |
1103 | } | |
1104 | EXPORT_SYMBOL_GPL(snd_compress_deregister); | |
1105 | ||
1106 | static int __init snd_compress_init(void) | |
1107 | { | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static void __exit snd_compress_exit(void) | |
1112 | { | |
1113 | } | |
1114 | ||
1115 | module_init(snd_compress_init); | |
1116 | module_exit(snd_compress_exit); | |
1117 | ||
1118 | MODULE_DESCRIPTION("ALSA Compressed offload framework"); | |
1119 | MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>"); | |
1120 | MODULE_LICENSE("GPL v2"); |