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Linux 3.8-rc7
[cris-mirror.git] / sound / core / compress_offload.c
blobad11dc994792b4bb080c49a7036b8761731e5a1d
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>
31 #include <linux/mm.h>
32 #include <linux/mutex.h>
33 #include <linux/poll.h>
34 #include <linux/slab.h>
35 #include <linux/sched.h>
36 #include <linux/uio.h>
37 #include <linux/uaccess.h>
38 #include <linux/module.h>
39 #include <sound/core.h>
40 #include <sound/initval.h>
41 #include <sound/compress_params.h>
42 #include <sound/compress_offload.h>
43 #include <sound/compress_driver.h>
44
45 /* TODO:
46 * - add substream support for multiple devices in case of
47 * SND_DYNAMIC_MINORS is not used
48 * - Multiple node representation
49 * driver should be able to register multiple nodes
50 */
51
52 static DEFINE_MUTEX(device_mutex);
53
54 struct snd_compr_file {
55 unsigned long caps;
56 struct snd_compr_stream stream;
57 };
58
59 /*
60 * a note on stream states used:
61 * we use follwing states in the compressed core
62 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
63 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
64 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
65 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
66 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
67 * decoding/encoding and rendering/capturing data.
68 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
69 * by calling SNDRV_COMPRESS_DRAIN.
70 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
71 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
72 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
73 */
74 static int snd_compr_open(struct inode *inode, struct file *f)
75 {
76 struct snd_compr *compr;
77 struct snd_compr_file *data;
78 struct snd_compr_runtime *runtime;
79 enum snd_compr_direction dirn;
80 int maj = imajor(inode);
81 int ret;
82
83 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
84 dirn = SND_COMPRESS_PLAYBACK;
85 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
86 dirn = SND_COMPRESS_CAPTURE;
87 else
88 return -EINVAL;
89
90 if (maj == snd_major)
91 compr = snd_lookup_minor_data(iminor(inode),
92 SNDRV_DEVICE_TYPE_COMPRESS);
93 else
94 return -EBADFD;
95
96 if (compr == NULL) {
97 pr_err("no device data!!!\n");
98 return -ENODEV;
99 }
100
101 if (dirn != compr->direction) {
102 pr_err("this device doesn't support this direction\n");
103 snd_card_unref(compr->card);
104 return -EINVAL;
105 }
106
107 data = kzalloc(sizeof(*data), GFP_KERNEL);
108 if (!data) {
109 snd_card_unref(compr->card);
110 return -ENOMEM;
111 }
112 data->stream.ops = compr->ops;
113 data->stream.direction = dirn;
114 data->stream.private_data = compr->private_data;
115 data->stream.device = compr;
116 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
117 if (!runtime) {
118 kfree(data);
119 snd_card_unref(compr->card);
120 return -ENOMEM;
121 }
122 runtime->state = SNDRV_PCM_STATE_OPEN;
123 init_waitqueue_head(&runtime->sleep);
124 data->stream.runtime = runtime;
125 f->private_data = (void *)data;
126 mutex_lock(&compr->lock);
127 ret = compr->ops->open(&data->stream);
128 mutex_unlock(&compr->lock);
129 if (ret) {
130 kfree(runtime);
131 kfree(data);
132 }
133 snd_card_unref(compr->card);
134 return 0;
135 }
136
137 static int snd_compr_free(struct inode *inode, struct file *f)
138 {
139 struct snd_compr_file *data = f->private_data;
140 data->stream.ops->free(&data->stream);
141 kfree(data->stream.runtime->buffer);
142 kfree(data->stream.runtime);
143 kfree(data);
144 return 0;
145 }
146
147 static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
148 struct snd_compr_tstamp *tstamp)
149 {
150 if (!stream->ops->pointer)
151 return;
152 stream->ops->pointer(stream, tstamp);
153 pr_debug("dsp consumed till %d total %d bytes\n",
154 tstamp->byte_offset, tstamp->copied_total);
155 stream->runtime->hw_pointer = tstamp->byte_offset;
156 stream->runtime->total_bytes_transferred = tstamp->copied_total;
157 }
158
159 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
160 struct snd_compr_avail *avail)
161 {
162 long avail_calc; /*this needs to be signed variable */
163
164 snd_compr_update_tstamp(stream, &avail->tstamp);
165
166 /* FIXME: This needs to be different for capture stream,
167 available is # of compressed data, for playback it's
168 remainder of buffer */
169
170 if (stream->runtime->total_bytes_available == 0 &&
171 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
172 pr_debug("detected init and someone forgot to do a write\n");
173 return stream->runtime->buffer_size;
174 }
175 pr_debug("app wrote %lld, DSP consumed %lld\n",
176 stream->runtime->total_bytes_available,
177 stream->runtime->total_bytes_transferred);
178 if (stream->runtime->total_bytes_available ==
179 stream->runtime->total_bytes_transferred) {
180 pr_debug("both pointers are same, returning full avail\n");
181 return stream->runtime->buffer_size;
182 }
183
184 /* FIXME: this routine isn't consistent, in one test we use
185 * cumulative values and in the other byte offsets. Do we
186 * really need the byte offsets if the cumulative values have
187 * been updated? In the PCM interface app_ptr and hw_ptr are
188 * already cumulative */
189
190 avail_calc = stream->runtime->buffer_size -
191 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
192 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
193 stream->runtime->app_pointer,
194 stream->runtime->hw_pointer);
195 if (avail_calc >= stream->runtime->buffer_size)
196 avail_calc -= stream->runtime->buffer_size;
197 pr_debug("ret avail as %ld\n", avail_calc);
198 avail->avail = avail_calc;
199 return avail_calc;
200 }
201
202 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
203 {
204 struct snd_compr_avail avail;
205
206 return snd_compr_calc_avail(stream, &avail);
207 }
208
209 static int
210 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
211 {
212 struct snd_compr_avail ioctl_avail;
213 size_t avail;
214
215 avail = snd_compr_calc_avail(stream, &ioctl_avail);
216 ioctl_avail.avail = avail;
217
218 if (copy_to_user((__u64 __user *)arg,
219 &ioctl_avail, sizeof(ioctl_avail)))
220 return -EFAULT;
221 return 0;
222 }
223
224 static int snd_compr_write_data(struct snd_compr_stream *stream,
225 const char __user *buf, size_t count)
226 {
227 void *dstn;
228 size_t copy;
229 struct snd_compr_runtime *runtime = stream->runtime;
230
231 dstn = runtime->buffer + runtime->app_pointer;
232 pr_debug("copying %ld at %lld\n",
233 (unsigned long)count, runtime->app_pointer);
234 if (count < runtime->buffer_size - runtime->app_pointer) {
235 if (copy_from_user(dstn, buf, count))
236 return -EFAULT;
237 runtime->app_pointer += count;
238 } else {
239 copy = runtime->buffer_size - runtime->app_pointer;
240 if (copy_from_user(dstn, buf, copy))
241 return -EFAULT;
242 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
243 return -EFAULT;
244 runtime->app_pointer = count - copy;
245 }
246 /* if DSP cares, let it know data has been written */
247 if (stream->ops->ack)
248 stream->ops->ack(stream, count);
249 return count;
250 }
251
252 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
253 size_t count, loff_t *offset)
254 {
255 struct snd_compr_file *data = f->private_data;
256 struct snd_compr_stream *stream;
257 size_t avail;
258 int retval;
259
260 if (snd_BUG_ON(!data))
261 return -EFAULT;
262
263 stream = &data->stream;
264 mutex_lock(&stream->device->lock);
265 /* write is allowed when stream is running or has been steup */
266 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
267 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
268 mutex_unlock(&stream->device->lock);
269 return -EBADFD;
270 }
271
272 avail = snd_compr_get_avail(stream);
273 pr_debug("avail returned %ld\n", (unsigned long)avail);
274 /* calculate how much we can write to buffer */
275 if (avail > count)
276 avail = count;
277
278 if (stream->ops->copy)
279 retval = stream->ops->copy(stream, buf, avail);
280 else
281 retval = snd_compr_write_data(stream, buf, avail);
282 if (retval > 0)
283 stream->runtime->total_bytes_available += retval;
284
285 /* while initiating the stream, write should be called before START
286 * call, so in setup move state */
287 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
288 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
289 pr_debug("stream prepared, Houston we are good to go\n");
290 }
291
292 mutex_unlock(&stream->device->lock);
293 return retval;
294 }
295
296
297 static ssize_t snd_compr_read(struct file *f, char __user *buf,
298 size_t count, loff_t *offset)
299 {
300 return -ENXIO;
301 }
302
303 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
304 {
305 return -ENXIO;
306 }
307
308 static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
309 {
310 if (stream->direction == SND_COMPRESS_PLAYBACK)
311 return POLLOUT | POLLWRNORM;
312 else
313 return POLLIN | POLLRDNORM;
314 }
315
316 static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
317 {
318 struct snd_compr_file *data = f->private_data;
319 struct snd_compr_stream *stream;
320 size_t avail;
321 int retval = 0;
322
323 if (snd_BUG_ON(!data))
324 return -EFAULT;
325 stream = &data->stream;
326 if (snd_BUG_ON(!stream))
327 return -EFAULT;
328
329 mutex_lock(&stream->device->lock);
330 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
331 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
332 retval = -EBADFD;
333 goto out;
334 }
335 poll_wait(f, &stream->runtime->sleep, wait);
336
337 avail = snd_compr_get_avail(stream);
338 pr_debug("avail is %ld\n", (unsigned long)avail);
339 /* check if we have at least one fragment to fill */
340 switch (stream->runtime->state) {
341 case SNDRV_PCM_STATE_DRAINING:
342 /* stream has been woken up after drain is complete
343 * draining done so set stream state to stopped
344 */
345 retval = snd_compr_get_poll(stream);
346 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
347 break;
348 case SNDRV_PCM_STATE_RUNNING:
349 case SNDRV_PCM_STATE_PREPARED:
350 case SNDRV_PCM_STATE_PAUSED:
351 if (avail >= stream->runtime->fragment_size)
352 retval = snd_compr_get_poll(stream);
353 break;
354 default:
355 if (stream->direction == SND_COMPRESS_PLAYBACK)
356 retval = POLLOUT | POLLWRNORM | POLLERR;
357 else
358 retval = POLLIN | POLLRDNORM | POLLERR;
359 break;
360 }
361 out:
362 mutex_unlock(&stream->device->lock);
363 return retval;
364 }
365
366 static int
367 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
368 {
369 int retval;
370 struct snd_compr_caps caps;
371
372 if (!stream->ops->get_caps)
373 return -ENXIO;
374
375 retval = stream->ops->get_caps(stream, &caps);
376 if (retval)
377 goto out;
378 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
379 retval = -EFAULT;
380 out:
381 return retval;
382 }
383
384 static int
385 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
386 {
387 int retval;
388 struct snd_compr_codec_caps *caps;
389
390 if (!stream->ops->get_codec_caps)
391 return -ENXIO;
392
393 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
394 if (!caps)
395 return -ENOMEM;
396
397 retval = stream->ops->get_codec_caps(stream, caps);
398 if (retval)
399 goto out;
400 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
401 retval = -EFAULT;
402
403 out:
404 kfree(caps);
405 return retval;
406 }
407
408 /* revisit this with snd_pcm_preallocate_xxx */
409 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
410 struct snd_compr_params *params)
411 {
412 unsigned int buffer_size;
413 void *buffer;
414
415 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
416 if (stream->ops->copy) {
417 buffer = NULL;
418 /* if copy is defined the driver will be required to copy
419 * the data from core
420 */
421 } else {
422 buffer = kmalloc(buffer_size, GFP_KERNEL);
423 if (!buffer)
424 return -ENOMEM;
425 }
426 stream->runtime->fragment_size = params->buffer.fragment_size;
427 stream->runtime->fragments = params->buffer.fragments;
428 stream->runtime->buffer = buffer;
429 stream->runtime->buffer_size = buffer_size;
430 return 0;
431 }
432
433 static int snd_compress_check_input(struct snd_compr_params *params)
434 {
435 /* first let's check the buffer parameter's */
436 if (params->buffer.fragment_size == 0 ||
437 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
438 return -EINVAL;
439
440 /* now codec parameters */
441 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
442 return -EINVAL;
443
444 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
445 return -EINVAL;
446
447 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
448 return -EINVAL;
449
450 return 0;
451 }
452
453 static int
454 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
455 {
456 struct snd_compr_params *params;
457 int retval;
458
459 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
460 /*
461 * we should allow parameter change only when stream has been
462 * opened not in other cases
463 */
464 params = kmalloc(sizeof(*params), GFP_KERNEL);
465 if (!params)
466 return -ENOMEM;
467 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
468 retval = -EFAULT;
469 goto out;
470 }
471
472 retval = snd_compress_check_input(params);
473 if (retval)
474 goto out;
475
476 retval = snd_compr_allocate_buffer(stream, params);
477 if (retval) {
478 retval = -ENOMEM;
479 goto out;
480 }
481
482 retval = stream->ops->set_params(stream, params);
483 if (retval)
484 goto out;
485 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
486 } else {
487 return -EPERM;
488 }
489 out:
490 kfree(params);
491 return retval;
492 }
493
494 static int
495 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
496 {
497 struct snd_codec *params;
498 int retval;
499
500 if (!stream->ops->get_params)
501 return -EBADFD;
502
503 params = kmalloc(sizeof(*params), GFP_KERNEL);
504 if (!params)
505 return -ENOMEM;
506 retval = stream->ops->get_params(stream, params);
507 if (retval)
508 goto out;
509 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
510 retval = -EFAULT;
511
512 out:
513 kfree(params);
514 return retval;
515 }
516
517 static inline int
518 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
519 {
520 struct snd_compr_tstamp tstamp;
521
522 snd_compr_update_tstamp(stream, &tstamp);
523 return copy_to_user((struct snd_compr_tstamp __user *)arg,
524 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
525 }
526
527 static int snd_compr_pause(struct snd_compr_stream *stream)
528 {
529 int retval;
530
531 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
532 return -EPERM;
533 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
534 if (!retval)
535 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
536 return retval;
537 }
538
539 static int snd_compr_resume(struct snd_compr_stream *stream)
540 {
541 int retval;
542
543 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
544 return -EPERM;
545 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
546 if (!retval)
547 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
548 return retval;
549 }
550
551 static int snd_compr_start(struct snd_compr_stream *stream)
552 {
553 int retval;
554
555 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
556 return -EPERM;
557 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
558 if (!retval)
559 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
560 return retval;
561 }
562
563 static int snd_compr_stop(struct snd_compr_stream *stream)
564 {
565 int retval;
566
567 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
568 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
569 return -EPERM;
570 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
571 if (!retval) {
572 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
573 wake_up(&stream->runtime->sleep);
574 stream->runtime->hw_pointer = 0;
575 stream->runtime->app_pointer = 0;
576 stream->runtime->total_bytes_available = 0;
577 stream->runtime->total_bytes_transferred = 0;
578 }
579 return retval;
580 }
581
582 static int snd_compr_drain(struct snd_compr_stream *stream)
583 {
584 int retval;
585
586 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
587 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
588 return -EPERM;
589 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
590 if (!retval) {
591 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
592 wake_up(&stream->runtime->sleep);
593 }
594 return retval;
595 }
596
597 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
598 {
599 struct snd_compr_file *data = f->private_data;
600 struct snd_compr_stream *stream;
601 int retval = -ENOTTY;
602
603 if (snd_BUG_ON(!data))
604 return -EFAULT;
605 stream = &data->stream;
606 if (snd_BUG_ON(!stream))
607 return -EFAULT;
608 mutex_lock(&stream->device->lock);
609 switch (_IOC_NR(cmd)) {
610 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
611 put_user(SNDRV_COMPRESS_VERSION,
612 (int __user *)arg) ? -EFAULT : 0;
613 break;
614 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
615 retval = snd_compr_get_caps(stream, arg);
616 break;
617 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
618 retval = snd_compr_get_codec_caps(stream, arg);
619 break;
620 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
621 retval = snd_compr_set_params(stream, arg);
622 break;
623 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
624 retval = snd_compr_get_params(stream, arg);
625 break;
626 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
627 retval = snd_compr_tstamp(stream, arg);
628 break;
629 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
630 retval = snd_compr_ioctl_avail(stream, arg);
631 break;
632 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
633 retval = snd_compr_pause(stream);
634 break;
635 case _IOC_NR(SNDRV_COMPRESS_RESUME):
636 retval = snd_compr_resume(stream);
637 break;
638 case _IOC_NR(SNDRV_COMPRESS_START):
639 retval = snd_compr_start(stream);
640 break;
641 case _IOC_NR(SNDRV_COMPRESS_STOP):
642 retval = snd_compr_stop(stream);
643 break;
644 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
645 retval = snd_compr_drain(stream);
646 break;
647 }
648 mutex_unlock(&stream->device->lock);
649 return retval;
650 }
651
652 static const struct file_operations snd_compr_file_ops = {
653 .owner = THIS_MODULE,
654 .open = snd_compr_open,
655 .release = snd_compr_free,
656 .write = snd_compr_write,
657 .read = snd_compr_read,
658 .unlocked_ioctl = snd_compr_ioctl,
659 .mmap = snd_compr_mmap,
660 .poll = snd_compr_poll,
661 };
662
663 static int snd_compress_dev_register(struct snd_device *device)
664 {
665 int ret = -EINVAL;
666 char str[16];
667 struct snd_compr *compr;
668
669 if (snd_BUG_ON(!device || !device->device_data))
670 return -EBADFD;
671 compr = device->device_data;
672
673 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
674 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
675 compr->direction);
676 /* register compressed device */
677 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
678 compr->device, &snd_compr_file_ops, compr, str);
679 if (ret < 0) {
680 pr_err("snd_register_device failed\n %d", ret);
681 return ret;
682 }
683 return ret;
684
685 }
686
687 static int snd_compress_dev_disconnect(struct snd_device *device)
688 {
689 struct snd_compr *compr;
690
691 compr = device->device_data;
692 snd_unregister_device(compr->direction, compr->card, compr->device);
693 return 0;
694 }
695
696 /*
697 * snd_compress_new: create new compress device
698 * @card: sound card pointer
699 * @device: device number
700 * @dirn: device direction, should be of type enum snd_compr_direction
701 * @compr: compress device pointer
702 */
703 int snd_compress_new(struct snd_card *card, int device,
704 int dirn, struct snd_compr *compr)
705 {
706 static struct snd_device_ops ops = {
707 .dev_free = NULL,
708 .dev_register = snd_compress_dev_register,
709 .dev_disconnect = snd_compress_dev_disconnect,
710 };
711
712 compr->card = card;
713 compr->device = device;
714 compr->direction = dirn;
715 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
716 }
717 EXPORT_SYMBOL_GPL(snd_compress_new);
718
719 static int snd_compress_add_device(struct snd_compr *device)
720 {
721 int ret;
722
723 if (!device->card)
724 return -EINVAL;
725
726 /* register the card */
727 ret = snd_card_register(device->card);
728 if (ret)
729 goto out;
730 return 0;
731
732 out:
733 pr_err("failed with %d\n", ret);
734 return ret;
735
736 }
737
738 static int snd_compress_remove_device(struct snd_compr *device)
739 {
740 return snd_card_free(device->card);
741 }
742
743 /**
744 * snd_compress_register - register compressed device
745 *
746 * @device: compressed device to register
747 */
748 int snd_compress_register(struct snd_compr *device)
749 {
750 int retval;
751
752 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
753 return -EINVAL;
754
755 pr_debug("Registering compressed device %s\n", device->name);
756 if (snd_BUG_ON(!device->ops->open))
757 return -EINVAL;
758 if (snd_BUG_ON(!device->ops->free))
759 return -EINVAL;
760 if (snd_BUG_ON(!device->ops->set_params))
761 return -EINVAL;
762 if (snd_BUG_ON(!device->ops->trigger))
763 return -EINVAL;
764
765 mutex_init(&device->lock);
766
767 /* register a compressed card */
768 mutex_lock(&device_mutex);
769 retval = snd_compress_add_device(device);
770 mutex_unlock(&device_mutex);
771 return retval;
772 }
773 EXPORT_SYMBOL_GPL(snd_compress_register);
774
775 int snd_compress_deregister(struct snd_compr *device)
776 {
777 pr_debug("Removing compressed device %s\n", device->name);
778 mutex_lock(&device_mutex);
779 snd_compress_remove_device(device);
780 mutex_unlock(&device_mutex);
781 return 0;
782 }
783 EXPORT_SYMBOL_GPL(snd_compress_deregister);
784
785 static int __init snd_compress_init(void)
786 {
787 return 0;
788 }
789
790 static void __exit snd_compress_exit(void)
791 {
792 }
793
794 module_init(snd_compress_init);
795 module_exit(snd_compress_exit);
796
797 MODULE_DESCRIPTION("ALSA Compressed offload framework");
798 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
799 MODULE_LICENSE("GPL v2");
CRIS linux kernel tree