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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/math64.h>
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>
37#include <linux/types.h>
38#include <linux/uio.h>
39#include <linux/uaccess.h>
40#include <linux/module.h>
41#include <sound/core.h>
42#include <sound/initval.h>
43#include <sound/compress_params.h>
44#include <sound/compress_offload.h>
45#include <sound/compress_driver.h>
46
47
48
49
50
51
52
53
54static DEFINE_MUTEX(device_mutex);
55
56struct snd_compr_file {
57 unsigned long caps;
58 struct snd_compr_stream stream;
59};
60
61
62
63
64
65
66
67
68
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70
71
72
73
74
75
76static int snd_compr_open(struct inode *inode, struct file *f)
77{
78 struct snd_compr *compr;
79 struct snd_compr_file *data;
80 struct snd_compr_runtime *runtime;
81 enum snd_compr_direction dirn;
82 int maj = imajor(inode);
83 int ret;
84
85 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
86 dirn = SND_COMPRESS_PLAYBACK;
87 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
88 dirn = SND_COMPRESS_CAPTURE;
89 else
90 return -EINVAL;
91
92 if (maj == snd_major)
93 compr = snd_lookup_minor_data(iminor(inode),
94 SNDRV_DEVICE_TYPE_COMPRESS);
95 else
96 return -EBADFD;
97
98 if (compr == NULL) {
99 pr_err("no device data!!!\n");
100 return -ENODEV;
101 }
102
103 if (dirn != compr->direction) {
104 pr_err("this device doesn't support this direction\n");
105 snd_card_unref(compr->card);
106 return -EINVAL;
107 }
108
109 data = kzalloc(sizeof(*data), GFP_KERNEL);
110 if (!data) {
111 snd_card_unref(compr->card);
112 return -ENOMEM;
113 }
114 data->stream.ops = compr->ops;
115 data->stream.direction = dirn;
116 data->stream.private_data = compr->private_data;
117 data->stream.device = compr;
118 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119 if (!runtime) {
120 kfree(data);
121 snd_card_unref(compr->card);
122 return -ENOMEM;
123 }
124 runtime->state = SNDRV_PCM_STATE_OPEN;
125 init_waitqueue_head(&runtime->sleep);
126 data->stream.runtime = runtime;
127 f->private_data = (void *)data;
128 mutex_lock(&compr->lock);
129 ret = compr->ops->open(&data->stream);
130 mutex_unlock(&compr->lock);
131 if (ret) {
132 kfree(runtime);
133 kfree(data);
134 }
135 snd_card_unref(compr->card);
136 return 0;
137}
138
139static int snd_compr_free(struct inode *inode, struct file *f)
140{
141 struct snd_compr_file *data = f->private_data;
142 struct snd_compr_runtime *runtime = data->stream.runtime;
143
144 switch (runtime->state) {
145 case SNDRV_PCM_STATE_RUNNING:
146 case SNDRV_PCM_STATE_DRAINING:
147 case SNDRV_PCM_STATE_PAUSED:
148 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
149 break;
150 default:
151 break;
152 }
153
154 data->stream.ops->free(&data->stream);
155 kfree(data->stream.runtime->buffer);
156 kfree(data->stream.runtime);
157 kfree(data);
158 return 0;
159}
160
161static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
162 struct snd_compr_tstamp *tstamp)
163{
164 if (!stream->ops->pointer)
165 return -ENOTSUPP;
166 stream->ops->pointer(stream, tstamp);
167 pr_debug("dsp consumed till %d total %d bytes\n",
168 tstamp->byte_offset, tstamp->copied_total);
169 if (stream->direction == SND_COMPRESS_PLAYBACK)
170 stream->runtime->total_bytes_transferred = tstamp->copied_total;
171 else
172 stream->runtime->total_bytes_available = tstamp->copied_total;
173 return 0;
174}
175
176static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
177 struct snd_compr_avail *avail)
178{
179 memset(avail, 0, sizeof(*avail));
180 snd_compr_update_tstamp(stream, &avail->tstamp);
181
182
183 if (stream->runtime->total_bytes_available == 0 &&
184 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
185 stream->direction == SND_COMPRESS_PLAYBACK) {
186 pr_debug("detected init and someone forgot to do a write\n");
187 return stream->runtime->buffer_size;
188 }
189 pr_debug("app wrote %lld, DSP consumed %lld\n",
190 stream->runtime->total_bytes_available,
191 stream->runtime->total_bytes_transferred);
192 if (stream->runtime->total_bytes_available ==
193 stream->runtime->total_bytes_transferred) {
194 if (stream->direction == SND_COMPRESS_PLAYBACK) {
195 pr_debug("both pointers are same, returning full avail\n");
196 return stream->runtime->buffer_size;
197 } else {
198 pr_debug("both pointers are same, returning no avail\n");
199 return 0;
200 }
201 }
202
203 avail->avail = stream->runtime->total_bytes_available -
204 stream->runtime->total_bytes_transferred;
205 if (stream->direction == SND_COMPRESS_PLAYBACK)
206 avail->avail = stream->runtime->buffer_size - avail->avail;
207
208 pr_debug("ret avail as %lld\n", avail->avail);
209 return avail->avail;
210}
211
212static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
213{
214 struct snd_compr_avail avail;
215
216 return snd_compr_calc_avail(stream, &avail);
217}
218
219static int
220snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
221{
222 struct snd_compr_avail ioctl_avail;
223 size_t avail;
224
225 avail = snd_compr_calc_avail(stream, &ioctl_avail);
226 ioctl_avail.avail = avail;
227
228 if (copy_to_user((__u64 __user *)arg,
229 &ioctl_avail, sizeof(ioctl_avail)))
230 return -EFAULT;
231 return 0;
232}
233
234static int snd_compr_write_data(struct snd_compr_stream *stream,
235 const char __user *buf, size_t count)
236{
237 void *dstn;
238 size_t copy;
239 struct snd_compr_runtime *runtime = stream->runtime;
240
241 u64 app_pointer = div64_u64(runtime->total_bytes_available,
242 runtime->buffer_size);
243 app_pointer = runtime->total_bytes_available -
244 (app_pointer * runtime->buffer_size);
245
246 dstn = runtime->buffer + app_pointer;
247 pr_debug("copying %ld at %lld\n",
248 (unsigned long)count, app_pointer);
249 if (count < runtime->buffer_size - app_pointer) {
250 if (copy_from_user(dstn, buf, count))
251 return -EFAULT;
252 } else {
253 copy = runtime->buffer_size - app_pointer;
254 if (copy_from_user(dstn, buf, copy))
255 return -EFAULT;
256 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
257 return -EFAULT;
258 }
259
260 if (stream->ops->ack)
261 stream->ops->ack(stream, count);
262 return count;
263}
264
265static ssize_t snd_compr_write(struct file *f, const char __user *buf,
266 size_t count, loff_t *offset)
267{
268 struct snd_compr_file *data = f->private_data;
269 struct snd_compr_stream *stream;
270 size_t avail;
271 int retval;
272
273 if (snd_BUG_ON(!data))
274 return -EFAULT;
275
276 stream = &data->stream;
277 mutex_lock(&stream->device->lock);
278
279 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
280 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
281 mutex_unlock(&stream->device->lock);
282 return -EBADFD;
283 }
284
285 avail = snd_compr_get_avail(stream);
286 pr_debug("avail returned %ld\n", (unsigned long)avail);
287
288 if (avail > count)
289 avail = count;
290
291 if (stream->ops->copy) {
292 char __user* cbuf = (char __user*)buf;
293 retval = stream->ops->copy(stream, cbuf, avail);
294 } else {
295 retval = snd_compr_write_data(stream, buf, avail);
296 }
297 if (retval > 0)
298 stream->runtime->total_bytes_available += retval;
299
300
301
302 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
303 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
304 pr_debug("stream prepared, Houston we are good to go\n");
305 }
306
307 mutex_unlock(&stream->device->lock);
308 return retval;
309}
310
311
312static ssize_t snd_compr_read(struct file *f, char __user *buf,
313 size_t count, loff_t *offset)
314{
315 struct snd_compr_file *data = f->private_data;
316 struct snd_compr_stream *stream;
317 size_t avail;
318 int retval;
319
320 if (snd_BUG_ON(!data))
321 return -EFAULT;
322
323 stream = &data->stream;
324 mutex_lock(&stream->device->lock);
325
326
327
328
329
330 switch (stream->runtime->state) {
331 case SNDRV_PCM_STATE_OPEN:
332 case SNDRV_PCM_STATE_PREPARED:
333 case SNDRV_PCM_STATE_XRUN:
334 case SNDRV_PCM_STATE_SUSPENDED:
335 case SNDRV_PCM_STATE_DISCONNECTED:
336 retval = -EBADFD;
337 goto out;
338 }
339
340 avail = snd_compr_get_avail(stream);
341 pr_debug("avail returned %ld\n", (unsigned long)avail);
342
343 if (avail > count)
344 avail = count;
345
346 if (stream->ops->copy) {
347 retval = stream->ops->copy(stream, buf, avail);
348 } else {
349 retval = -ENXIO;
350 goto out;
351 }
352 if (retval > 0)
353 stream->runtime->total_bytes_transferred += retval;
354
355out:
356 mutex_unlock(&stream->device->lock);
357 return retval;
358}
359
360static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
361{
362 return -ENXIO;
363}
364
365static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
366{
367 if (stream->direction == SND_COMPRESS_PLAYBACK)
368 return POLLOUT | POLLWRNORM;
369 else
370 return POLLIN | POLLRDNORM;
371}
372
373static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
374{
375 struct snd_compr_file *data = f->private_data;
376 struct snd_compr_stream *stream;
377 size_t avail;
378 int retval = 0;
379
380 if (snd_BUG_ON(!data))
381 return -EFAULT;
382 stream = &data->stream;
383 if (snd_BUG_ON(!stream))
384 return -EFAULT;
385
386 mutex_lock(&stream->device->lock);
387 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
388 retval = -EBADFD;
389 goto out;
390 }
391 poll_wait(f, &stream->runtime->sleep, wait);
392
393 avail = snd_compr_get_avail(stream);
394 pr_debug("avail is %ld\n", (unsigned long)avail);
395
396 switch (stream->runtime->state) {
397 case SNDRV_PCM_STATE_DRAINING:
398
399
400
401 retval = snd_compr_get_poll(stream);
402 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
403 break;
404 case SNDRV_PCM_STATE_RUNNING:
405 case SNDRV_PCM_STATE_PREPARED:
406 case SNDRV_PCM_STATE_PAUSED:
407 if (avail >= stream->runtime->fragment_size)
408 retval = snd_compr_get_poll(stream);
409 break;
410 default:
411 if (stream->direction == SND_COMPRESS_PLAYBACK)
412 retval = POLLOUT | POLLWRNORM | POLLERR;
413 else
414 retval = POLLIN | POLLRDNORM | POLLERR;
415 break;
416 }
417out:
418 mutex_unlock(&stream->device->lock);
419 return retval;
420}
421
422static int
423snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
424{
425 int retval;
426 struct snd_compr_caps caps;
427
428 if (!stream->ops->get_caps)
429 return -ENXIO;
430
431 memset(&caps, 0, sizeof(caps));
432 retval = stream->ops->get_caps(stream, &caps);
433 if (retval)
434 goto out;
435 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
436 retval = -EFAULT;
437out:
438 return retval;
439}
440
441static int
442snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
443{
444 int retval;
445 struct snd_compr_codec_caps *caps;
446
447 if (!stream->ops->get_codec_caps)
448 return -ENXIO;
449
450 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
451 if (!caps)
452 return -ENOMEM;
453
454 retval = stream->ops->get_codec_caps(stream, caps);
455 if (retval)
456 goto out;
457 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
458 retval = -EFAULT;
459
460out:
461 kfree(caps);
462 return retval;
463}
464
465
466static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
467 struct snd_compr_params *params)
468{
469 unsigned int buffer_size;
470 void *buffer;
471
472 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
473 if (stream->ops->copy) {
474 buffer = NULL;
475
476
477
478 } else {
479 buffer = kmalloc(buffer_size, GFP_KERNEL);
480 if (!buffer)
481 return -ENOMEM;
482 }
483 stream->runtime->fragment_size = params->buffer.fragment_size;
484 stream->runtime->fragments = params->buffer.fragments;
485 stream->runtime->buffer = buffer;
486 stream->runtime->buffer_size = buffer_size;
487 return 0;
488}
489
490static int snd_compress_check_input(struct snd_compr_params *params)
491{
492
493 if (params->buffer.fragment_size == 0 ||
494 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
495 return -EINVAL;
496
497
498 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
499 return -EINVAL;
500
501 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
502 return -EINVAL;
503
504 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
505 return -EINVAL;
506
507 return 0;
508}
509
510static int
511snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
512{
513 struct snd_compr_params *params;
514 int retval;
515
516 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
517
518
519
520
521 params = kmalloc(sizeof(*params), GFP_KERNEL);
522 if (!params)
523 return -ENOMEM;
524 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
525 retval = -EFAULT;
526 goto out;
527 }
528
529 retval = snd_compress_check_input(params);
530 if (retval)
531 goto out;
532
533 retval = snd_compr_allocate_buffer(stream, params);
534 if (retval) {
535 retval = -ENOMEM;
536 goto out;
537 }
538
539 retval = stream->ops->set_params(stream, params);
540 if (retval)
541 goto out;
542
543 stream->metadata_set = false;
544 stream->next_track = false;
545
546 if (stream->direction == SND_COMPRESS_PLAYBACK)
547 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
548 else
549 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
550 } else {
551 return -EPERM;
552 }
553out:
554 kfree(params);
555 return retval;
556}
557
558static int
559snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
560{
561 struct snd_codec *params;
562 int retval;
563
564 if (!stream->ops->get_params)
565 return -EBADFD;
566
567 params = kzalloc(sizeof(*params), GFP_KERNEL);
568 if (!params)
569 return -ENOMEM;
570 retval = stream->ops->get_params(stream, params);
571 if (retval)
572 goto out;
573 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
574 retval = -EFAULT;
575
576out:
577 kfree(params);
578 return retval;
579}
580
581static int
582snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
583{
584 struct snd_compr_metadata metadata;
585 int retval;
586
587 if (!stream->ops->get_metadata)
588 return -ENXIO;
589
590 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
591 return -EFAULT;
592
593 retval = stream->ops->get_metadata(stream, &metadata);
594 if (retval != 0)
595 return retval;
596
597 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
598 return -EFAULT;
599
600 return 0;
601}
602
603static int
604snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
605{
606 struct snd_compr_metadata metadata;
607 int retval;
608
609 if (!stream->ops->set_metadata)
610 return -ENXIO;
611
612
613
614
615 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
616 return -EFAULT;
617
618 retval = stream->ops->set_metadata(stream, &metadata);
619 stream->metadata_set = true;
620
621 return retval;
622}
623
624static inline int
625snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
626{
627 struct snd_compr_tstamp tstamp = {0};
628 int ret;
629
630 ret = snd_compr_update_tstamp(stream, &tstamp);
631 if (ret == 0)
632 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
633 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
634 return ret;
635}
636
637static int snd_compr_pause(struct snd_compr_stream *stream)
638{
639 int retval;
640
641 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
642 return -EPERM;
643 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
644 if (!retval)
645 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
646 return retval;
647}
648
649static int snd_compr_resume(struct snd_compr_stream *stream)
650{
651 int retval;
652
653 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
654 return -EPERM;
655 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
656 if (!retval)
657 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
658 return retval;
659}
660
661static int snd_compr_start(struct snd_compr_stream *stream)
662{
663 int retval;
664
665 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
666 return -EPERM;
667 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
668 if (!retval)
669 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
670 return retval;
671}
672
673static int snd_compr_stop(struct snd_compr_stream *stream)
674{
675 int retval;
676
677 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
678 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
679 return -EPERM;
680 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
681 if (!retval) {
682 snd_compr_drain_notify(stream);
683 stream->runtime->total_bytes_available = 0;
684 stream->runtime->total_bytes_transferred = 0;
685 }
686 return retval;
687}
688
689static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
690{
691 int ret;
692
693
694
695
696
697
698
699
700
701 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
702 mutex_unlock(&stream->device->lock);
703
704
705
706
707
708
709
710 ret = wait_event_interruptible(stream->runtime->sleep,
711 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
712 if (ret == -ERESTARTSYS)
713 pr_debug("wait aborted by a signal");
714 else if (ret)
715 pr_debug("wait for drain failed with %d\n", ret);
716
717
718 wake_up(&stream->runtime->sleep);
719 mutex_lock(&stream->device->lock);
720
721 return ret;
722}
723
724static int snd_compr_drain(struct snd_compr_stream *stream)
725{
726 int retval;
727
728 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
729 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
730 return -EPERM;
731
732 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
733 if (retval) {
734 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
735 wake_up(&stream->runtime->sleep);
736 return retval;
737 }
738
739 return snd_compress_wait_for_drain(stream);
740}
741
742static int snd_compr_next_track(struct snd_compr_stream *stream)
743{
744 int retval;
745
746
747 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
748 return -EPERM;
749
750
751
752
753 if (stream->metadata_set == false)
754 return -EPERM;
755
756 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
757 if (retval != 0)
758 return retval;
759 stream->metadata_set = false;
760 stream->next_track = true;
761 return 0;
762}
763
764static int snd_compr_partial_drain(struct snd_compr_stream *stream)
765{
766 int retval;
767 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
768 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
769 return -EPERM;
770
771 if (stream->next_track == false)
772 return -EPERM;
773
774 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
775 if (retval) {
776 pr_debug("Partial drain returned failure\n");
777 wake_up(&stream->runtime->sleep);
778 return retval;
779 }
780
781 stream->next_track = false;
782 return snd_compress_wait_for_drain(stream);
783}
784
785static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
786{
787 struct snd_compr_file *data = f->private_data;
788 struct snd_compr_stream *stream;
789 int retval = -ENOTTY;
790
791 if (snd_BUG_ON(!data))
792 return -EFAULT;
793 stream = &data->stream;
794 if (snd_BUG_ON(!stream))
795 return -EFAULT;
796 mutex_lock(&stream->device->lock);
797 switch (_IOC_NR(cmd)) {
798 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
799 retval = put_user(SNDRV_COMPRESS_VERSION,
800 (int __user *)arg) ? -EFAULT : 0;
801 break;
802 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
803 retval = snd_compr_get_caps(stream, arg);
804 break;
805 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
806 retval = snd_compr_get_codec_caps(stream, arg);
807 break;
808 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
809 retval = snd_compr_set_params(stream, arg);
810 break;
811 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
812 retval = snd_compr_get_params(stream, arg);
813 break;
814 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
815 retval = snd_compr_set_metadata(stream, arg);
816 break;
817 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
818 retval = snd_compr_get_metadata(stream, arg);
819 break;
820 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
821 retval = snd_compr_tstamp(stream, arg);
822 break;
823 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
824 retval = snd_compr_ioctl_avail(stream, arg);
825 break;
826 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
827 retval = snd_compr_pause(stream);
828 break;
829 case _IOC_NR(SNDRV_COMPRESS_RESUME):
830 retval = snd_compr_resume(stream);
831 break;
832 case _IOC_NR(SNDRV_COMPRESS_START):
833 retval = snd_compr_start(stream);
834 break;
835 case _IOC_NR(SNDRV_COMPRESS_STOP):
836 retval = snd_compr_stop(stream);
837 break;
838 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
839 retval = snd_compr_drain(stream);
840 break;
841 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
842 retval = snd_compr_partial_drain(stream);
843 break;
844 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
845 retval = snd_compr_next_track(stream);
846 break;
847
848 }
849 mutex_unlock(&stream->device->lock);
850 return retval;
851}
852
853static const struct file_operations snd_compr_file_ops = {
854 .owner = THIS_MODULE,
855 .open = snd_compr_open,
856 .release = snd_compr_free,
857 .write = snd_compr_write,
858 .read = snd_compr_read,
859 .unlocked_ioctl = snd_compr_ioctl,
860 .mmap = snd_compr_mmap,
861 .poll = snd_compr_poll,
862};
863
864static int snd_compress_dev_register(struct snd_device *device)
865{
866 int ret = -EINVAL;
867 char str[16];
868 struct snd_compr *compr;
869
870 if (snd_BUG_ON(!device || !device->device_data))
871 return -EBADFD;
872 compr = device->device_data;
873
874 sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
875 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
876 compr->direction);
877
878 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
879 compr->device, &snd_compr_file_ops, compr, str);
880 if (ret < 0) {
881 pr_err("snd_register_device failed\n %d", ret);
882 return ret;
883 }
884 return ret;
885
886}
887
888static int snd_compress_dev_disconnect(struct snd_device *device)
889{
890 struct snd_compr *compr;
891
892 compr = device->device_data;
893 snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
894 compr->device);
895 return 0;
896}
897
898
899
900
901
902
903
904
905int snd_compress_new(struct snd_card *card, int device,
906 int dirn, struct snd_compr *compr)
907{
908 static struct snd_device_ops ops = {
909 .dev_free = NULL,
910 .dev_register = snd_compress_dev_register,
911 .dev_disconnect = snd_compress_dev_disconnect,
912 };
913
914 compr->card = card;
915 compr->device = device;
916 compr->direction = dirn;
917 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
918}
919EXPORT_SYMBOL_GPL(snd_compress_new);
920
921static int snd_compress_add_device(struct snd_compr *device)
922{
923 int ret;
924
925 if (!device->card)
926 return -EINVAL;
927
928
929 ret = snd_card_register(device->card);
930 if (ret)
931 goto out;
932 return 0;
933
934out:
935 pr_err("failed with %d\n", ret);
936 return ret;
937
938}
939
940static int snd_compress_remove_device(struct snd_compr *device)
941{
942 return snd_card_free(device->card);
943}
944
945
946
947
948
949
950int snd_compress_register(struct snd_compr *device)
951{
952 int retval;
953
954 if (device->name == NULL || device->dev == NULL || device->ops == NULL)
955 return -EINVAL;
956
957 pr_debug("Registering compressed device %s\n", device->name);
958 if (snd_BUG_ON(!device->ops->open))
959 return -EINVAL;
960 if (snd_BUG_ON(!device->ops->free))
961 return -EINVAL;
962 if (snd_BUG_ON(!device->ops->set_params))
963 return -EINVAL;
964 if (snd_BUG_ON(!device->ops->trigger))
965 return -EINVAL;
966
967 mutex_init(&device->lock);
968
969
970 mutex_lock(&device_mutex);
971 retval = snd_compress_add_device(device);
972 mutex_unlock(&device_mutex);
973 return retval;
974}
975EXPORT_SYMBOL_GPL(snd_compress_register);
976
977int snd_compress_deregister(struct snd_compr *device)
978{
979 pr_debug("Removing compressed device %s\n", device->name);
980 mutex_lock(&device_mutex);
981 snd_compress_remove_device(device);
982 mutex_unlock(&device_mutex);
983 return 0;
984}
985EXPORT_SYMBOL_GPL(snd_compress_deregister);
986
987static int __init snd_compress_init(void)
988{
989 return 0;
990}
991
992static void __exit snd_compress_exit(void)
993{
994}
995
996module_init(snd_compress_init);
997module_exit(snd_compress_exit);
998
999MODULE_DESCRIPTION("ALSA Compressed offload framework");
1000MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1001MODULE_LICENSE("GPL v2");
1002