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