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xfs: add CRCs to attr leaf blocks
[linux-2.6.git] / sound / core / compress_offload.c
blobc84abc886e901459f316c29fecb6c9f65d337bb2
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 int snd_compr_update_tstamp(struct snd_compr_stream *stream,
148 struct snd_compr_tstamp *tstamp)
149 {
150 if (!stream->ops->pointer)
151 return -ENOTSUPP;
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 return 0;
158 }
159
160 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
161 struct snd_compr_avail *avail)
162 {
163 long avail_calc; /*this needs to be signed variable */
164
165 memset(avail, 0, sizeof(*avail));
166 snd_compr_update_tstamp(stream, &avail->tstamp);
167 /* Still need to return avail even if tstamp can't be filled in */
168
169 /* FIXME: This needs to be different for capture stream,
170 available is # of compressed data, for playback it's
171 remainder of buffer */
172
173 if (stream->runtime->total_bytes_available == 0 &&
174 stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
175 pr_debug("detected init and someone forgot to do a write\n");
176 return stream->runtime->buffer_size;
177 }
178 pr_debug("app wrote %lld, DSP consumed %lld\n",
179 stream->runtime->total_bytes_available,
180 stream->runtime->total_bytes_transferred);
181 if (stream->runtime->total_bytes_available ==
182 stream->runtime->total_bytes_transferred) {
183 pr_debug("both pointers are same, returning full avail\n");
184 return stream->runtime->buffer_size;
185 }
186
187 /* FIXME: this routine isn't consistent, in one test we use
188 * cumulative values and in the other byte offsets. Do we
189 * really need the byte offsets if the cumulative values have
190 * been updated? In the PCM interface app_ptr and hw_ptr are
191 * already cumulative */
192
193 avail_calc = stream->runtime->buffer_size -
194 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
195 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
196 stream->runtime->app_pointer,
197 stream->runtime->hw_pointer);
198 if (avail_calc >= stream->runtime->buffer_size)
199 avail_calc -= stream->runtime->buffer_size;
200 pr_debug("ret avail as %ld\n", avail_calc);
201 avail->avail = avail_calc;
202 return avail_calc;
203 }
204
205 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
206 {
207 struct snd_compr_avail avail;
208
209 return snd_compr_calc_avail(stream, &avail);
210 }
211
212 static int
213 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
214 {
215 struct snd_compr_avail ioctl_avail;
216 size_t avail;
217
218 avail = snd_compr_calc_avail(stream, &ioctl_avail);
219 ioctl_avail.avail = avail;
220
221 if (copy_to_user((__u64 __user *)arg,
222 &ioctl_avail, sizeof(ioctl_avail)))
223 return -EFAULT;
224 return 0;
225 }
226
227 static int snd_compr_write_data(struct snd_compr_stream *stream,
228 const char __user *buf, size_t count)
229 {
230 void *dstn;
231 size_t copy;
232 struct snd_compr_runtime *runtime = stream->runtime;
233
234 dstn = runtime->buffer + runtime->app_pointer;
235 pr_debug("copying %ld at %lld\n",
236 (unsigned long)count, runtime->app_pointer);
237 if (count < runtime->buffer_size - runtime->app_pointer) {
238 if (copy_from_user(dstn, buf, count))
239 return -EFAULT;
240 runtime->app_pointer += count;
241 } else {
242 copy = runtime->buffer_size - runtime->app_pointer;
243 if (copy_from_user(dstn, buf, copy))
244 return -EFAULT;
245 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
246 return -EFAULT;
247 runtime->app_pointer = count - copy;
248 }
249 /* if DSP cares, let it know data has been written */
250 if (stream->ops->ack)
251 stream->ops->ack(stream, count);
252 return count;
253 }
254
255 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
256 size_t count, loff_t *offset)
257 {
258 struct snd_compr_file *data = f->private_data;
259 struct snd_compr_stream *stream;
260 size_t avail;
261 int retval;
262
263 if (snd_BUG_ON(!data))
264 return -EFAULT;
265
266 stream = &data->stream;
267 mutex_lock(&stream->device->lock);
268 /* write is allowed when stream is running or has been steup */
269 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
270 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
271 mutex_unlock(&stream->device->lock);
272 return -EBADFD;
273 }
274
275 avail = snd_compr_get_avail(stream);
276 pr_debug("avail returned %ld\n", (unsigned long)avail);
277 /* calculate how much we can write to buffer */
278 if (avail > count)
279 avail = count;
280
281 if (stream->ops->copy)
282 retval = stream->ops->copy(stream, buf, avail);
283 else
284 retval = snd_compr_write_data(stream, buf, avail);
285 if (retval > 0)
286 stream->runtime->total_bytes_available += retval;
287
288 /* while initiating the stream, write should be called before START
289 * call, so in setup move state */
290 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
291 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
292 pr_debug("stream prepared, Houston we are good to go\n");
293 }
294
295 mutex_unlock(&stream->device->lock);
296 return retval;
297 }
298
299
300 static ssize_t snd_compr_read(struct file *f, char __user *buf,
301 size_t count, loff_t *offset)
302 {
303 return -ENXIO;
304 }
305
306 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
307 {
308 return -ENXIO;
309 }
310
311 static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
312 {
313 if (stream->direction == SND_COMPRESS_PLAYBACK)
314 return POLLOUT | POLLWRNORM;
315 else
316 return POLLIN | POLLRDNORM;
317 }
318
319 static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
320 {
321 struct snd_compr_file *data = f->private_data;
322 struct snd_compr_stream *stream;
323 size_t avail;
324 int retval = 0;
325
326 if (snd_BUG_ON(!data))
327 return -EFAULT;
328 stream = &data->stream;
329 if (snd_BUG_ON(!stream))
330 return -EFAULT;
331
332 mutex_lock(&stream->device->lock);
333 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
334 stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
335 retval = -EBADFD;
336 goto out;
337 }
338 poll_wait(f, &stream->runtime->sleep, wait);
339
340 avail = snd_compr_get_avail(stream);
341 pr_debug("avail is %ld\n", (unsigned long)avail);
342 /* check if we have at least one fragment to fill */
343 switch (stream->runtime->state) {
344 case SNDRV_PCM_STATE_DRAINING:
345 /* stream has been woken up after drain is complete
346 * draining done so set stream state to stopped
347 */
348 retval = snd_compr_get_poll(stream);
349 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
350 break;
351 case SNDRV_PCM_STATE_RUNNING:
352 case SNDRV_PCM_STATE_PREPARED:
353 case SNDRV_PCM_STATE_PAUSED:
354 if (avail >= stream->runtime->fragment_size)
355 retval = snd_compr_get_poll(stream);
356 break;
357 default:
358 if (stream->direction == SND_COMPRESS_PLAYBACK)
359 retval = POLLOUT | POLLWRNORM | POLLERR;
360 else
361 retval = POLLIN | POLLRDNORM | POLLERR;
362 break;
363 }
364 out:
365 mutex_unlock(&stream->device->lock);
366 return retval;
367 }
368
369 static int
370 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
371 {
372 int retval;
373 struct snd_compr_caps caps;
374
375 if (!stream->ops->get_caps)
376 return -ENXIO;
377
378 retval = stream->ops->get_caps(stream, &caps);
379 if (retval)
380 goto out;
381 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
382 retval = -EFAULT;
383 out:
384 return retval;
385 }
386
387 static int
388 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
389 {
390 int retval;
391 struct snd_compr_codec_caps *caps;
392
393 if (!stream->ops->get_codec_caps)
394 return -ENXIO;
395
396 caps = kmalloc(sizeof(*caps), GFP_KERNEL);
397 if (!caps)
398 return -ENOMEM;
399
400 retval = stream->ops->get_codec_caps(stream, caps);
401 if (retval)
402 goto out;
403 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
404 retval = -EFAULT;
405
406 out:
407 kfree(caps);
408 return retval;
409 }
410
411 /* revisit this with snd_pcm_preallocate_xxx */
412 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
413 struct snd_compr_params *params)
414 {
415 unsigned int buffer_size;
416 void *buffer;
417
418 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
419 if (stream->ops->copy) {
420 buffer = NULL;
421 /* if copy is defined the driver will be required to copy
422 * the data from core
423 */
424 } else {
425 buffer = kmalloc(buffer_size, GFP_KERNEL);
426 if (!buffer)
427 return -ENOMEM;
428 }
429 stream->runtime->fragment_size = params->buffer.fragment_size;
430 stream->runtime->fragments = params->buffer.fragments;
431 stream->runtime->buffer = buffer;
432 stream->runtime->buffer_size = buffer_size;
433 return 0;
434 }
435
436 static int snd_compress_check_input(struct snd_compr_params *params)
437 {
438 /* first let's check the buffer parameter's */
439 if (params->buffer.fragment_size == 0 ||
440 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
441 return -EINVAL;
442
443 /* now codec parameters */
444 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
445 return -EINVAL;
446
447 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
448 return -EINVAL;
449
450 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
451 return -EINVAL;
452
453 return 0;
454 }
455
456 static int
457 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
458 {
459 struct snd_compr_params *params;
460 int retval;
461
462 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
463 /*
464 * we should allow parameter change only when stream has been
465 * opened not in other cases
466 */
467 params = kmalloc(sizeof(*params), GFP_KERNEL);
468 if (!params)
469 return -ENOMEM;
470 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
471 retval = -EFAULT;
472 goto out;
473 }
474
475 retval = snd_compress_check_input(params);
476 if (retval)
477 goto out;
478
479 retval = snd_compr_allocate_buffer(stream, params);
480 if (retval) {
481 retval = -ENOMEM;
482 goto out;
483 }
484
485 retval = stream->ops->set_params(stream, params);
486 if (retval)
487 goto out;
488 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
489 stream->metadata_set = false;
490 stream->next_track = false;
491 } else {
492 return -EPERM;
493 }
494 out:
495 kfree(params);
496 return retval;
497 }
498
499 static int
500 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
501 {
502 struct snd_codec *params;
503 int retval;
504
505 if (!stream->ops->get_params)
506 return -EBADFD;
507
508 params = kmalloc(sizeof(*params), GFP_KERNEL);
509 if (!params)
510 return -ENOMEM;
511 retval = stream->ops->get_params(stream, params);
512 if (retval)
513 goto out;
514 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
515 retval = -EFAULT;
516
517 out:
518 kfree(params);
519 return retval;
520 }
521
522 static int
523 snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
524 {
525 struct snd_compr_metadata metadata;
526 int retval;
527
528 if (!stream->ops->get_metadata)
529 return -ENXIO;
530
531 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
532 return -EFAULT;
533
534 retval = stream->ops->get_metadata(stream, &metadata);
535 if (retval != 0)
536 return retval;
537
538 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
539 return -EFAULT;
540
541 return 0;
542 }
543
544 static int
545 snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
546 {
547 struct snd_compr_metadata metadata;
548 int retval;
549
550 if (!stream->ops->set_metadata)
551 return -ENXIO;
552 /*
553 * we should allow parameter change only when stream has been
554 * opened not in other cases
555 */
556 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
557 return -EFAULT;
558
559 retval = stream->ops->set_metadata(stream, &metadata);
560 stream->metadata_set = true;
561
562 return retval;
563 }
564
565 static inline int
566 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
567 {
568 struct snd_compr_tstamp tstamp = {0};
569 int ret;
570
571 ret = snd_compr_update_tstamp(stream, &tstamp);
572 if (ret == 0)
573 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
574 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
575 return ret;
576 }
577
578 static int snd_compr_pause(struct snd_compr_stream *stream)
579 {
580 int retval;
581
582 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
583 return -EPERM;
584 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
585 if (!retval)
586 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
587 return retval;
588 }
589
590 static int snd_compr_resume(struct snd_compr_stream *stream)
591 {
592 int retval;
593
594 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
595 return -EPERM;
596 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
597 if (!retval)
598 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
599 return retval;
600 }
601
602 static int snd_compr_start(struct snd_compr_stream *stream)
603 {
604 int retval;
605
606 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
607 return -EPERM;
608 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
609 if (!retval)
610 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
611 return retval;
612 }
613
614 static int snd_compr_stop(struct snd_compr_stream *stream)
615 {
616 int retval;
617
618 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
619 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
620 return -EPERM;
621 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
622 if (!retval) {
623 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
624 wake_up(&stream->runtime->sleep);
625 stream->runtime->hw_pointer = 0;
626 stream->runtime->app_pointer = 0;
627 stream->runtime->total_bytes_available = 0;
628 stream->runtime->total_bytes_transferred = 0;
629 }
630 return retval;
631 }
632
633 static int snd_compr_drain(struct snd_compr_stream *stream)
634 {
635 int retval;
636
637 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
638 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
639 return -EPERM;
640 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
641 if (!retval) {
642 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
643 wake_up(&stream->runtime->sleep);
644 }
645 return retval;
646 }
647
648 static int snd_compr_next_track(struct snd_compr_stream *stream)
649 {
650 int retval;
651
652 /* only a running stream can transition to next track */
653 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
654 return -EPERM;
655
656 /* you can signal next track isf this is intended to be a gapless stream
657 * and current track metadata is set
658 */
659 if (stream->metadata_set == false)
660 return -EPERM;
661
662 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
663 if (retval != 0)
664 return retval;
665 stream->metadata_set = false;
666 stream->next_track = true;
667 return 0;
668 }
669
670 static int snd_compr_partial_drain(struct snd_compr_stream *stream)
671 {
672 int retval;
673 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
674 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
675 return -EPERM;
676 /* stream can be drained only when next track has been signalled */
677 if (stream->next_track == false)
678 return -EPERM;
679
680 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
681
682 stream->next_track = false;
683 return retval;
684 }
685
686 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
687 {
688 struct snd_compr_file *data = f->private_data;
689 struct snd_compr_stream *stream;
690 int retval = -ENOTTY;
691
692 if (snd_BUG_ON(!data))
693 return -EFAULT;
694 stream = &data->stream;
695 if (snd_BUG_ON(!stream))
696 return -EFAULT;
697 mutex_lock(&stream->device->lock);
698 switch (_IOC_NR(cmd)) {
699 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
700 put_user(SNDRV_COMPRESS_VERSION,
701 (int __user *)arg) ? -EFAULT : 0;
702 break;
703 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
704 retval = snd_compr_get_caps(stream, arg);
705 break;
706 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
707 retval = snd_compr_get_codec_caps(stream, arg);
708 break;
709 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
710 retval = snd_compr_set_params(stream, arg);
711 break;
712 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
713 retval = snd_compr_get_params(stream, arg);
714 break;
715 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
716 retval = snd_compr_set_metadata(stream, arg);
717 break;
718 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
719 retval = snd_compr_get_metadata(stream, arg);
720 break;
721 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
722 retval = snd_compr_tstamp(stream, arg);
723 break;
724 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
725 retval = snd_compr_ioctl_avail(stream, arg);
726 break;
727 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
728 retval = snd_compr_pause(stream);
729 break;
730 case _IOC_NR(SNDRV_COMPRESS_RESUME):
731 retval = snd_compr_resume(stream);
732 break;
733 case _IOC_NR(SNDRV_COMPRESS_START):
734 retval = snd_compr_start(stream);
735 break;
736 case _IOC_NR(SNDRV_COMPRESS_STOP):
737 retval = snd_compr_stop(stream);
738 break;
739 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
740 retval = snd_compr_drain(stream);
741 break;
742 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
743 retval = snd_compr_partial_drain(stream);
744 break;
745 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
746 retval = snd_compr_next_track(stream);
747 break;
748
749 }
750 mutex_unlock(&stream->device->lock);
751 return retval;
752 }
753
754 static const struct file_operations snd_compr_file_ops = {
755 .owner = THIS_MODULE,
756 .open = snd_compr_open,
757 .release = snd_compr_free,
758 .write = snd_compr_write,
759 .read = snd_compr_read,
760 .unlocked_ioctl = snd_compr_ioctl,
761 .mmap = snd_compr_mmap,
762 .poll = snd_compr_poll,
763 };
764
765 static int snd_compress_dev_register(struct snd_device *device)
766 {
767 int ret = -EINVAL;
768 char str[16];
769 struct snd_compr *compr;
770
771 if (snd_BUG_ON(!device || !device->device_data))
772 return -EBADFD;
773 compr = device->device_data;
774
775 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
776 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
777 compr->direction);
778 /* register compressed device */
779 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
780 compr->device, &snd_compr_file_ops, compr, str);
781 if (ret < 0) {
782 pr_err("snd_register_device failed\n %d", ret);
783 return ret;
784 }
785 return ret;
786
787 }
788
789 static int snd_compress_dev_disconnect(struct snd_device *device)
790 {
791 struct snd_compr *compr;
792
793 compr = device->device_data;
794 snd_unregister_device(compr->direction, compr->card, compr->device);
795 return 0;
796 }
797
798 /*
799 * snd_compress_new: create new compress device
800 * @card: sound card pointer
801 * @device: device number
802 * @dirn: device direction, should be of type enum snd_compr_direction
803 * @compr: compress device pointer
804 */
805 int snd_compress_new(struct snd_card *card, int device,
806 int dirn, struct snd_compr *compr)
807 {
808 static struct snd_device_ops ops = {
809 .dev_free = NULL,
810 .dev_register = snd_compress_dev_register,
811 .dev_disconnect = snd_compress_dev_disconnect,
812 };
813
814 compr->card = card;
815 compr->device = device;
816 compr->direction = dirn;
817 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
818 }
819 EXPORT_SYMBOL_GPL(snd_compress_new);
820
821 static int snd_compress_add_device(struct snd_compr *device)
822 {
823 int ret;
824
825 if (!device->card)
826 return -EINVAL;
827
828 /* register the card */
829 ret = snd_card_register(device->card);
830 if (ret)
831 goto out;
832 return 0;
833
834 out:
835 pr_err("failed with %d\n", ret);
836 return ret;
837
838 }
839
840 static int snd_compress_remove_device(struct snd_compr *device)
841 {
842 return snd_card_free(device->card);
843 }
844
845 /**
846 * snd_compress_register - register compressed device
847 *
848 * @device: compressed device to register
849 */
850 int snd_compress_register(struct snd_compr *device)
851 {
852 int retval;
853
854 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
855 return -EINVAL;
856
857 pr_debug("Registering compressed device %s\n", device->name);
858 if (snd_BUG_ON(!device->ops->open))
859 return -EINVAL;
860 if (snd_BUG_ON(!device->ops->free))
861 return -EINVAL;
862 if (snd_BUG_ON(!device->ops->set_params))
863 return -EINVAL;
864 if (snd_BUG_ON(!device->ops->trigger))
865 return -EINVAL;
866
867 mutex_init(&device->lock);
868
869 /* register a compressed card */
870 mutex_lock(&device_mutex);
871 retval = snd_compress_add_device(device);
872 mutex_unlock(&device_mutex);
873 return retval;
874 }
875 EXPORT_SYMBOL_GPL(snd_compress_register);
876
877 int snd_compress_deregister(struct snd_compr *device)
878 {
879 pr_debug("Removing compressed device %s\n", device->name);
880 mutex_lock(&device_mutex);
881 snd_compress_remove_device(device);
882 mutex_unlock(&device_mutex);
883 return 0;
884 }
885 EXPORT_SYMBOL_GPL(snd_compress_deregister);
886
887 static int __init snd_compress_init(void)
888 {
889 return 0;
890 }
891
892 static void __exit snd_compress_exit(void)
893 {
894 }
895
896 module_init(snd_compress_init);
897 module_exit(snd_compress_exit);
898
899 MODULE_DESCRIPTION("ALSA Compressed offload framework");
900 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
901 MODULE_LICENSE("GPL v2");
Linus' kernel tree