1
2
3
4
5
6
7
8
9
10
11
12#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
13#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
14
15#include <linux/file.h>
16#include <linux/fs.h>
17#include <linux/list.h>
18#include <linux/math64.h>
19#include <linux/mm.h>
20#include <linux/mutex.h>
21#include <linux/poll.h>
22#include <linux/slab.h>
23#include <linux/sched.h>
24#include <linux/types.h>
25#include <linux/uio.h>
26#include <linux/uaccess.h>
27#include <linux/module.h>
28#include <linux/compat.h>
29#include <sound/core.h>
30#include <sound/initval.h>
31#include <sound/info.h>
32#include <sound/compress_params.h>
33#include <sound/compress_offload.h>
34#include <sound/compress_driver.h>
35
36
37
38
39#if _IOC_SIZEBITS < 14
40#define COMPR_CODEC_CAPS_OVERFLOW
41#endif
42
43
44
45
46
47
48
49
50static DEFINE_MUTEX(device_mutex);
51
52struct snd_compr_file {
53 unsigned long caps;
54 struct snd_compr_stream stream;
55};
56
57static void error_delayed_work(struct work_struct *work);
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77static int snd_compr_open(struct inode *inode, struct file *f)
78{
79 struct snd_compr *compr;
80 struct snd_compr_file *data;
81 struct snd_compr_runtime *runtime;
82 enum snd_compr_direction dirn;
83 int maj = imajor(inode);
84 int ret;
85
86 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
87 dirn = SND_COMPRESS_PLAYBACK;
88 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
89 dirn = SND_COMPRESS_CAPTURE;
90 else
91 return -EINVAL;
92
93 if (maj == snd_major)
94 compr = snd_lookup_minor_data(iminor(inode),
95 SNDRV_DEVICE_TYPE_COMPRESS);
96 else
97 return -EBADFD;
98
99 if (compr == NULL) {
100 pr_err("no device data!!!\n");
101 return -ENODEV;
102 }
103
104 if (dirn != compr->direction) {
105 pr_err("this device doesn't support this direction\n");
106 snd_card_unref(compr->card);
107 return -EINVAL;
108 }
109
110 data = kzalloc(sizeof(*data), GFP_KERNEL);
111 if (!data) {
112 snd_card_unref(compr->card);
113 return -ENOMEM;
114 }
115
116 INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
117
118 data->stream.ops = compr->ops;
119 data->stream.direction = dirn;
120 data->stream.private_data = compr->private_data;
121 data->stream.device = compr;
122 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
123 if (!runtime) {
124 kfree(data);
125 snd_card_unref(compr->card);
126 return -ENOMEM;
127 }
128 runtime->state = SNDRV_PCM_STATE_OPEN;
129 init_waitqueue_head(&runtime->sleep);
130 data->stream.runtime = runtime;
131 f->private_data = (void *)data;
132 mutex_lock(&compr->lock);
133 ret = compr->ops->open(&data->stream);
134 mutex_unlock(&compr->lock);
135 if (ret) {
136 kfree(runtime);
137 kfree(data);
138 }
139 snd_card_unref(compr->card);
140 return ret;
141}
142
143static int snd_compr_free(struct inode *inode, struct file *f)
144{
145 struct snd_compr_file *data = f->private_data;
146 struct snd_compr_runtime *runtime = data->stream.runtime;
147
148 cancel_delayed_work_sync(&data->stream.error_work);
149
150 switch (runtime->state) {
151 case SNDRV_PCM_STATE_RUNNING:
152 case SNDRV_PCM_STATE_DRAINING:
153 case SNDRV_PCM_STATE_PAUSED:
154 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
155 break;
156 default:
157 break;
158 }
159
160 data->stream.ops->free(&data->stream);
161 if (!data->stream.runtime->dma_buffer_p)
162 kfree(data->stream.runtime->buffer);
163 kfree(data->stream.runtime);
164 kfree(data);
165 return 0;
166}
167
168static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
169 struct snd_compr_tstamp *tstamp)
170{
171 if (!stream->ops->pointer)
172 return -ENOTSUPP;
173 stream->ops->pointer(stream, tstamp);
174 pr_debug("dsp consumed till %d total %d bytes\n",
175 tstamp->byte_offset, tstamp->copied_total);
176 if (stream->direction == SND_COMPRESS_PLAYBACK)
177 stream->runtime->total_bytes_transferred = tstamp->copied_total;
178 else
179 stream->runtime->total_bytes_available = tstamp->copied_total;
180 return 0;
181}
182
183static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
184 struct snd_compr_avail *avail)
185{
186 memset(avail, 0, sizeof(*avail));
187 snd_compr_update_tstamp(stream, &avail->tstamp);
188
189
190 if (stream->runtime->total_bytes_available == 0 &&
191 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
192 stream->direction == SND_COMPRESS_PLAYBACK) {
193 pr_debug("detected init and someone forgot to do a write\n");
194 return stream->runtime->buffer_size;
195 }
196 pr_debug("app wrote %lld, DSP consumed %lld\n",
197 stream->runtime->total_bytes_available,
198 stream->runtime->total_bytes_transferred);
199 if (stream->runtime->total_bytes_available ==
200 stream->runtime->total_bytes_transferred) {
201 if (stream->direction == SND_COMPRESS_PLAYBACK) {
202 pr_debug("both pointers are same, returning full avail\n");
203 return stream->runtime->buffer_size;
204 } else {
205 pr_debug("both pointers are same, returning no avail\n");
206 return 0;
207 }
208 }
209
210 avail->avail = stream->runtime->total_bytes_available -
211 stream->runtime->total_bytes_transferred;
212 if (stream->direction == SND_COMPRESS_PLAYBACK)
213 avail->avail = stream->runtime->buffer_size - avail->avail;
214
215 pr_debug("ret avail as %lld\n", avail->avail);
216 return avail->avail;
217}
218
219static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
220{
221 struct snd_compr_avail avail;
222
223 return snd_compr_calc_avail(stream, &avail);
224}
225
226static int
227snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
228{
229 struct snd_compr_avail ioctl_avail;
230 size_t avail;
231
232 avail = snd_compr_calc_avail(stream, &ioctl_avail);
233 ioctl_avail.avail = avail;
234
235 switch (stream->runtime->state) {
236 case SNDRV_PCM_STATE_OPEN:
237 return -EBADFD;
238 case SNDRV_PCM_STATE_XRUN:
239 return -EPIPE;
240 default:
241 break;
242 }
243
244 if (copy_to_user((__u64 __user *)arg,
245 &ioctl_avail, sizeof(ioctl_avail)))
246 return -EFAULT;
247 return 0;
248}
249
250static int snd_compr_write_data(struct snd_compr_stream *stream,
251 const char __user *buf, size_t count)
252{
253 void *dstn;
254 size_t copy;
255 struct snd_compr_runtime *runtime = stream->runtime;
256
257 u64 app_pointer = div64_u64(runtime->total_bytes_available,
258 runtime->buffer_size);
259 app_pointer = runtime->total_bytes_available -
260 (app_pointer * runtime->buffer_size);
261
262 dstn = runtime->buffer + app_pointer;
263 pr_debug("copying %ld at %lld\n",
264 (unsigned long)count, app_pointer);
265 if (count < runtime->buffer_size - app_pointer) {
266 if (copy_from_user(dstn, buf, count))
267 return -EFAULT;
268 } else {
269 copy = runtime->buffer_size - app_pointer;
270 if (copy_from_user(dstn, buf, copy))
271 return -EFAULT;
272 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
273 return -EFAULT;
274 }
275
276 if (stream->ops->ack)
277 stream->ops->ack(stream, count);
278 return count;
279}
280
281static ssize_t snd_compr_write(struct file *f, const char __user *buf,
282 size_t count, loff_t *offset)
283{
284 struct snd_compr_file *data = f->private_data;
285 struct snd_compr_stream *stream;
286 size_t avail;
287 int retval;
288
289 if (snd_BUG_ON(!data))
290 return -EFAULT;
291
292 stream = &data->stream;
293 mutex_lock(&stream->device->lock);
294
295 switch (stream->runtime->state) {
296 case SNDRV_PCM_STATE_SETUP:
297 case SNDRV_PCM_STATE_PREPARED:
298 case SNDRV_PCM_STATE_RUNNING:
299 break;
300 default:
301 mutex_unlock(&stream->device->lock);
302 return -EBADFD;
303 }
304
305 avail = snd_compr_get_avail(stream);
306 pr_debug("avail returned %ld\n", (unsigned long)avail);
307
308 if (avail > count)
309 avail = count;
310
311 if (stream->ops->copy) {
312 char __user* cbuf = (char __user*)buf;
313 retval = stream->ops->copy(stream, cbuf, avail);
314 } else {
315 retval = snd_compr_write_data(stream, buf, avail);
316 }
317 if (retval > 0)
318 stream->runtime->total_bytes_available += retval;
319
320
321
322 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
323 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
324 pr_debug("stream prepared, Houston we are good to go\n");
325 }
326
327 mutex_unlock(&stream->device->lock);
328 return retval;
329}
330
331
332static ssize_t snd_compr_read(struct file *f, char __user *buf,
333 size_t count, loff_t *offset)
334{
335 struct snd_compr_file *data = f->private_data;
336 struct snd_compr_stream *stream;
337 size_t avail;
338 int retval;
339
340 if (snd_BUG_ON(!data))
341 return -EFAULT;
342
343 stream = &data->stream;
344 mutex_lock(&stream->device->lock);
345
346
347
348
349
350 switch (stream->runtime->state) {
351 case SNDRV_PCM_STATE_OPEN:
352 case SNDRV_PCM_STATE_PREPARED:
353 case SNDRV_PCM_STATE_SUSPENDED:
354 case SNDRV_PCM_STATE_DISCONNECTED:
355 retval = -EBADFD;
356 goto out;
357 case SNDRV_PCM_STATE_XRUN:
358 retval = -EPIPE;
359 goto out;
360 }
361
362 avail = snd_compr_get_avail(stream);
363 pr_debug("avail returned %ld\n", (unsigned long)avail);
364
365 if (avail > count)
366 avail = count;
367
368 if (stream->ops->copy) {
369 retval = stream->ops->copy(stream, buf, avail);
370 } else {
371 retval = -ENXIO;
372 goto out;
373 }
374 if (retval > 0)
375 stream->runtime->total_bytes_transferred += retval;
376
377out:
378 mutex_unlock(&stream->device->lock);
379 return retval;
380}
381
382static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
383{
384 return -ENXIO;
385}
386
387static __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
388{
389 if (stream->direction == SND_COMPRESS_PLAYBACK)
390 return EPOLLOUT | EPOLLWRNORM;
391 else
392 return EPOLLIN | EPOLLRDNORM;
393}
394
395static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
396{
397 struct snd_compr_file *data = f->private_data;
398 struct snd_compr_stream *stream;
399 size_t avail;
400 __poll_t retval = 0;
401
402 if (snd_BUG_ON(!data))
403 return EPOLLERR;
404
405 stream = &data->stream;
406
407 mutex_lock(&stream->device->lock);
408
409 switch (stream->runtime->state) {
410 case SNDRV_PCM_STATE_OPEN:
411 case SNDRV_PCM_STATE_XRUN:
412 retval = snd_compr_get_poll(stream) | EPOLLERR;
413 goto out;
414 default:
415 break;
416 }
417
418 poll_wait(f, &stream->runtime->sleep, wait);
419
420 avail = snd_compr_get_avail(stream);
421 pr_debug("avail is %ld\n", (unsigned long)avail);
422
423 switch (stream->runtime->state) {
424 case SNDRV_PCM_STATE_DRAINING:
425
426
427
428 retval = snd_compr_get_poll(stream);
429 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
430 break;
431 case SNDRV_PCM_STATE_RUNNING:
432 case SNDRV_PCM_STATE_PREPARED:
433 case SNDRV_PCM_STATE_PAUSED:
434 if (avail >= stream->runtime->fragment_size)
435 retval = snd_compr_get_poll(stream);
436 break;
437 default:
438 retval = snd_compr_get_poll(stream) | EPOLLERR;
439 break;
440 }
441out:
442 mutex_unlock(&stream->device->lock);
443 return retval;
444}
445
446static int
447snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
448{
449 int retval;
450 struct snd_compr_caps caps;
451
452 if (!stream->ops->get_caps)
453 return -ENXIO;
454
455 memset(&caps, 0, sizeof(caps));
456 retval = stream->ops->get_caps(stream, &caps);
457 if (retval)
458 goto out;
459 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
460 retval = -EFAULT;
461out:
462 return retval;
463}
464
465#ifndef COMPR_CODEC_CAPS_OVERFLOW
466static int
467snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
468{
469 int retval;
470 struct snd_compr_codec_caps *caps;
471
472 if (!stream->ops->get_codec_caps)
473 return -ENXIO;
474
475 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
476 if (!caps)
477 return -ENOMEM;
478
479 retval = stream->ops->get_codec_caps(stream, caps);
480 if (retval)
481 goto out;
482 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
483 retval = -EFAULT;
484
485out:
486 kfree(caps);
487 return retval;
488}
489#endif
490
491int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size)
492{
493 struct snd_dma_buffer *dmab;
494 int ret;
495
496 if (snd_BUG_ON(!(stream) || !(stream)->runtime))
497 return -EINVAL;
498 dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
499 if (!dmab)
500 return -ENOMEM;
501 dmab->dev = stream->dma_buffer.dev;
502 ret = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab);
503 if (ret < 0) {
504 kfree(dmab);
505 return ret;
506 }
507
508 snd_compr_set_runtime_buffer(stream, dmab);
509 stream->runtime->dma_bytes = size;
510 return 1;
511}
512EXPORT_SYMBOL(snd_compr_malloc_pages);
513
514int snd_compr_free_pages(struct snd_compr_stream *stream)
515{
516 struct snd_compr_runtime *runtime;
517
518 if (snd_BUG_ON(!(stream) || !(stream)->runtime))
519 return -EINVAL;
520 runtime = stream->runtime;
521 if (runtime->dma_area == NULL)
522 return 0;
523 if (runtime->dma_buffer_p != &stream->dma_buffer) {
524
525 snd_dma_free_pages(runtime->dma_buffer_p);
526 kfree(runtime->dma_buffer_p);
527 }
528
529 snd_compr_set_runtime_buffer(stream, NULL);
530 return 0;
531}
532EXPORT_SYMBOL(snd_compr_free_pages);
533
534
535static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
536 struct snd_compr_params *params)
537{
538 unsigned int buffer_size;
539 void *buffer = NULL;
540
541 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
542 if (stream->ops->copy) {
543 buffer = NULL;
544
545
546
547 } else {
548 if (stream->runtime->dma_buffer_p) {
549
550 if (buffer_size > stream->runtime->dma_buffer_p->bytes)
551 dev_err(&stream->device->dev,
552 "Not enough DMA buffer");
553 else
554 buffer = stream->runtime->dma_buffer_p->area;
555
556 } else {
557 buffer = kmalloc(buffer_size, GFP_KERNEL);
558 }
559
560 if (!buffer)
561 return -ENOMEM;
562 }
563 stream->runtime->fragment_size = params->buffer.fragment_size;
564 stream->runtime->fragments = params->buffer.fragments;
565 stream->runtime->buffer = buffer;
566 stream->runtime->buffer_size = buffer_size;
567 return 0;
568}
569
570static int snd_compress_check_input(struct snd_compr_params *params)
571{
572
573 if (params->buffer.fragment_size == 0 ||
574 params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
575 params->buffer.fragments == 0)
576 return -EINVAL;
577
578
579 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
580 return -EINVAL;
581
582 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
583 return -EINVAL;
584
585 return 0;
586}
587
588static int
589snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
590{
591 struct snd_compr_params *params;
592 int retval;
593
594 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
595
596
597
598
599 params = memdup_user((void __user *)arg, sizeof(*params));
600 if (IS_ERR(params))
601 return PTR_ERR(params);
602
603 retval = snd_compress_check_input(params);
604 if (retval)
605 goto out;
606
607 retval = snd_compr_allocate_buffer(stream, params);
608 if (retval) {
609 retval = -ENOMEM;
610 goto out;
611 }
612
613 retval = stream->ops->set_params(stream, params);
614 if (retval)
615 goto out;
616
617 stream->metadata_set = false;
618 stream->next_track = false;
619
620 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
621 } else {
622 return -EPERM;
623 }
624out:
625 kfree(params);
626 return retval;
627}
628
629static int
630snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
631{
632 struct snd_codec *params;
633 int retval;
634
635 if (!stream->ops->get_params)
636 return -EBADFD;
637
638 params = kzalloc(sizeof(*params), GFP_KERNEL);
639 if (!params)
640 return -ENOMEM;
641 retval = stream->ops->get_params(stream, params);
642 if (retval)
643 goto out;
644 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
645 retval = -EFAULT;
646
647out:
648 kfree(params);
649 return retval;
650}
651
652static int
653snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
654{
655 struct snd_compr_metadata metadata;
656 int retval;
657
658 if (!stream->ops->get_metadata)
659 return -ENXIO;
660
661 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
662 return -EFAULT;
663
664 retval = stream->ops->get_metadata(stream, &metadata);
665 if (retval != 0)
666 return retval;
667
668 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
669 return -EFAULT;
670
671 return 0;
672}
673
674static int
675snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
676{
677 struct snd_compr_metadata metadata;
678 int retval;
679
680 if (!stream->ops->set_metadata)
681 return -ENXIO;
682
683
684
685
686 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
687 return -EFAULT;
688
689 retval = stream->ops->set_metadata(stream, &metadata);
690 stream->metadata_set = true;
691
692 return retval;
693}
694
695static inline int
696snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
697{
698 struct snd_compr_tstamp tstamp = {0};
699 int ret;
700
701 ret = snd_compr_update_tstamp(stream, &tstamp);
702 if (ret == 0)
703 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
704 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
705 return ret;
706}
707
708static int snd_compr_pause(struct snd_compr_stream *stream)
709{
710 int retval;
711
712 switch (stream->runtime->state) {
713 case SNDRV_PCM_STATE_RUNNING:
714 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
715 if (!retval)
716 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
717 break;
718 case SNDRV_PCM_STATE_DRAINING:
719 if (!stream->device->use_pause_in_draining)
720 return -EPERM;
721 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
722 if (!retval)
723 stream->pause_in_draining = true;
724 break;
725 default:
726 return -EPERM;
727 }
728 return retval;
729}
730
731static int snd_compr_resume(struct snd_compr_stream *stream)
732{
733 int retval;
734
735 switch (stream->runtime->state) {
736 case SNDRV_PCM_STATE_PAUSED:
737 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
738 if (!retval)
739 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
740 break;
741 case SNDRV_PCM_STATE_DRAINING:
742 if (!stream->pause_in_draining)
743 return -EPERM;
744 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
745 if (!retval)
746 stream->pause_in_draining = false;
747 break;
748 default:
749 return -EPERM;
750 }
751 return retval;
752}
753
754static int snd_compr_start(struct snd_compr_stream *stream)
755{
756 int retval;
757
758 switch (stream->runtime->state) {
759 case SNDRV_PCM_STATE_SETUP:
760 if (stream->direction != SND_COMPRESS_CAPTURE)
761 return -EPERM;
762 break;
763 case SNDRV_PCM_STATE_PREPARED:
764 break;
765 default:
766 return -EPERM;
767 }
768
769 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
770 if (!retval)
771 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
772 return retval;
773}
774
775static int snd_compr_stop(struct snd_compr_stream *stream)
776{
777 int retval;
778
779 switch (stream->runtime->state) {
780 case SNDRV_PCM_STATE_OPEN:
781 case SNDRV_PCM_STATE_SETUP:
782 case SNDRV_PCM_STATE_PREPARED:
783 return -EPERM;
784 default:
785 break;
786 }
787
788 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
789 if (!retval) {
790
791 stream->partial_drain = false;
792 stream->metadata_set = false;
793 stream->pause_in_draining = false;
794 snd_compr_drain_notify(stream);
795 stream->runtime->total_bytes_available = 0;
796 stream->runtime->total_bytes_transferred = 0;
797 }
798 return retval;
799}
800
801static void error_delayed_work(struct work_struct *work)
802{
803 struct snd_compr_stream *stream;
804
805 stream = container_of(work, struct snd_compr_stream, error_work.work);
806
807 mutex_lock(&stream->device->lock);
808
809 stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
810 wake_up(&stream->runtime->sleep);
811
812 mutex_unlock(&stream->device->lock);
813}
814
815
816
817
818
819
820
821
822
823
824int snd_compr_stop_error(struct snd_compr_stream *stream,
825 snd_pcm_state_t state)
826{
827 if (stream->runtime->state == state)
828 return 0;
829
830 stream->runtime->state = state;
831
832 pr_debug("Changing state to: %d\n", state);
833
834 queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
835
836 return 0;
837}
838EXPORT_SYMBOL_GPL(snd_compr_stop_error);
839
840static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
841{
842 int ret;
843
844
845
846
847
848
849
850
851
852 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
853 mutex_unlock(&stream->device->lock);
854
855
856
857
858
859
860
861 ret = wait_event_interruptible(stream->runtime->sleep,
862 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
863 if (ret == -ERESTARTSYS)
864 pr_debug("wait aborted by a signal\n");
865 else if (ret)
866 pr_debug("wait for drain failed with %d\n", ret);
867
868
869 wake_up(&stream->runtime->sleep);
870 mutex_lock(&stream->device->lock);
871
872 return ret;
873}
874
875static int snd_compr_drain(struct snd_compr_stream *stream)
876{
877 int retval;
878
879 switch (stream->runtime->state) {
880 case SNDRV_PCM_STATE_OPEN:
881 case SNDRV_PCM_STATE_SETUP:
882 case SNDRV_PCM_STATE_PREPARED:
883 case SNDRV_PCM_STATE_PAUSED:
884 return -EPERM;
885 case SNDRV_PCM_STATE_XRUN:
886 return -EPIPE;
887 default:
888 break;
889 }
890
891 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
892 if (retval) {
893 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
894 wake_up(&stream->runtime->sleep);
895 return retval;
896 }
897
898 return snd_compress_wait_for_drain(stream);
899}
900
901static int snd_compr_next_track(struct snd_compr_stream *stream)
902{
903 int retval;
904
905
906 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
907 return -EPERM;
908
909
910 if (stream->direction == SND_COMPRESS_CAPTURE)
911 return -EPERM;
912
913
914
915
916 if (stream->metadata_set == false)
917 return -EPERM;
918
919 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
920 if (retval != 0)
921 return retval;
922 stream->metadata_set = false;
923 stream->next_track = true;
924 return 0;
925}
926
927static int snd_compr_partial_drain(struct snd_compr_stream *stream)
928{
929 int retval;
930
931 switch (stream->runtime->state) {
932 case SNDRV_PCM_STATE_OPEN:
933 case SNDRV_PCM_STATE_SETUP:
934 case SNDRV_PCM_STATE_PREPARED:
935 case SNDRV_PCM_STATE_PAUSED:
936 return -EPERM;
937 case SNDRV_PCM_STATE_XRUN:
938 return -EPIPE;
939 default:
940 break;
941 }
942
943
944 if (stream->direction == SND_COMPRESS_CAPTURE)
945 return -EPERM;
946
947
948 if (stream->next_track == false)
949 return -EPERM;
950
951 stream->partial_drain = true;
952 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
953 if (retval) {
954 pr_debug("Partial drain returned failure\n");
955 wake_up(&stream->runtime->sleep);
956 return retval;
957 }
958
959 stream->next_track = false;
960 return snd_compress_wait_for_drain(stream);
961}
962
963static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
964{
965 struct snd_compr_file *data = f->private_data;
966 struct snd_compr_stream *stream;
967 int retval = -ENOTTY;
968
969 if (snd_BUG_ON(!data))
970 return -EFAULT;
971
972 stream = &data->stream;
973
974 mutex_lock(&stream->device->lock);
975 switch (_IOC_NR(cmd)) {
976 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
977 retval = put_user(SNDRV_COMPRESS_VERSION,
978 (int __user *)arg) ? -EFAULT : 0;
979 break;
980 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
981 retval = snd_compr_get_caps(stream, arg);
982 break;
983#ifndef COMPR_CODEC_CAPS_OVERFLOW
984 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
985 retval = snd_compr_get_codec_caps(stream, arg);
986 break;
987#endif
988 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
989 retval = snd_compr_set_params(stream, arg);
990 break;
991 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
992 retval = snd_compr_get_params(stream, arg);
993 break;
994 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
995 retval = snd_compr_set_metadata(stream, arg);
996 break;
997 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
998 retval = snd_compr_get_metadata(stream, arg);
999 break;
1000 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
1001 retval = snd_compr_tstamp(stream, arg);
1002 break;
1003 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
1004 retval = snd_compr_ioctl_avail(stream, arg);
1005 break;
1006 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
1007 retval = snd_compr_pause(stream);
1008 break;
1009 case _IOC_NR(SNDRV_COMPRESS_RESUME):
1010 retval = snd_compr_resume(stream);
1011 break;
1012 case _IOC_NR(SNDRV_COMPRESS_START):
1013 retval = snd_compr_start(stream);
1014 break;
1015 case _IOC_NR(SNDRV_COMPRESS_STOP):
1016 retval = snd_compr_stop(stream);
1017 break;
1018 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
1019 retval = snd_compr_drain(stream);
1020 break;
1021 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
1022 retval = snd_compr_partial_drain(stream);
1023 break;
1024 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
1025 retval = snd_compr_next_track(stream);
1026 break;
1027
1028 }
1029 mutex_unlock(&stream->device->lock);
1030 return retval;
1031}
1032
1033
1034#ifdef CONFIG_COMPAT
1035static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
1036 unsigned long arg)
1037{
1038 return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
1039}
1040#endif
1041
1042static const struct file_operations snd_compr_file_ops = {
1043 .owner = THIS_MODULE,
1044 .open = snd_compr_open,
1045 .release = snd_compr_free,
1046 .write = snd_compr_write,
1047 .read = snd_compr_read,
1048 .unlocked_ioctl = snd_compr_ioctl,
1049#ifdef CONFIG_COMPAT
1050 .compat_ioctl = snd_compr_ioctl_compat,
1051#endif
1052 .mmap = snd_compr_mmap,
1053 .poll = snd_compr_poll,
1054};
1055
1056static int snd_compress_dev_register(struct snd_device *device)
1057{
1058 int ret;
1059 struct snd_compr *compr;
1060
1061 if (snd_BUG_ON(!device || !device->device_data))
1062 return -EBADFD;
1063 compr = device->device_data;
1064
1065 pr_debug("reg device %s, direction %d\n", compr->name,
1066 compr->direction);
1067
1068 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
1069 compr->card, compr->device,
1070 &snd_compr_file_ops, compr, &compr->dev);
1071 if (ret < 0) {
1072 pr_err("snd_register_device failed %d\n", ret);
1073 return ret;
1074 }
1075 return ret;
1076
1077}
1078
1079static int snd_compress_dev_disconnect(struct snd_device *device)
1080{
1081 struct snd_compr *compr;
1082
1083 compr = device->device_data;
1084 snd_unregister_device(&compr->dev);
1085 return 0;
1086}
1087
1088#ifdef CONFIG_SND_VERBOSE_PROCFS
1089static void snd_compress_proc_info_read(struct snd_info_entry *entry,
1090 struct snd_info_buffer *buffer)
1091{
1092 struct snd_compr *compr = (struct snd_compr *)entry->private_data;
1093
1094 snd_iprintf(buffer, "card: %d\n", compr->card->number);
1095 snd_iprintf(buffer, "device: %d\n", compr->device);
1096 snd_iprintf(buffer, "stream: %s\n",
1097 compr->direction == SND_COMPRESS_PLAYBACK
1098 ? "PLAYBACK" : "CAPTURE");
1099 snd_iprintf(buffer, "id: %s\n", compr->id);
1100}
1101
1102static int snd_compress_proc_init(struct snd_compr *compr)
1103{
1104 struct snd_info_entry *entry;
1105 char name[16];
1106
1107 sprintf(name, "compr%i", compr->device);
1108 entry = snd_info_create_card_entry(compr->card, name,
1109 compr->card->proc_root);
1110 if (!entry)
1111 return -ENOMEM;
1112 entry->mode = S_IFDIR | 0555;
1113 compr->proc_root = entry;
1114
1115 entry = snd_info_create_card_entry(compr->card, "info",
1116 compr->proc_root);
1117 if (entry)
1118 snd_info_set_text_ops(entry, compr,
1119 snd_compress_proc_info_read);
1120 compr->proc_info_entry = entry;
1121
1122 return 0;
1123}
1124
1125static void snd_compress_proc_done(struct snd_compr *compr)
1126{
1127 snd_info_free_entry(compr->proc_info_entry);
1128 compr->proc_info_entry = NULL;
1129 snd_info_free_entry(compr->proc_root);
1130 compr->proc_root = NULL;
1131}
1132
1133static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1134{
1135 strlcpy(compr->id, id, sizeof(compr->id));
1136}
1137#else
1138static inline int snd_compress_proc_init(struct snd_compr *compr)
1139{
1140 return 0;
1141}
1142
1143static inline void snd_compress_proc_done(struct snd_compr *compr)
1144{
1145}
1146
1147static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1148{
1149}
1150#endif
1151
1152static int snd_compress_dev_free(struct snd_device *device)
1153{
1154 struct snd_compr *compr;
1155
1156 compr = device->device_data;
1157 snd_compress_proc_done(compr);
1158 put_device(&compr->dev);
1159 return 0;
1160}
1161
1162
1163
1164
1165
1166
1167
1168
1169int snd_compress_new(struct snd_card *card, int device,
1170 int dirn, const char *id, struct snd_compr *compr)
1171{
1172 static const struct snd_device_ops ops = {
1173 .dev_free = snd_compress_dev_free,
1174 .dev_register = snd_compress_dev_register,
1175 .dev_disconnect = snd_compress_dev_disconnect,
1176 };
1177 int ret;
1178
1179 compr->card = card;
1180 compr->device = device;
1181 compr->direction = dirn;
1182
1183 snd_compress_set_id(compr, id);
1184
1185 snd_device_initialize(&compr->dev, card);
1186 dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1187
1188 ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1189 if (ret == 0)
1190 snd_compress_proc_init(compr);
1191
1192 return ret;
1193}
1194EXPORT_SYMBOL_GPL(snd_compress_new);
1195
1196static int snd_compress_add_device(struct snd_compr *device)
1197{
1198 int ret;
1199
1200 if (!device->card)
1201 return -EINVAL;
1202
1203
1204 ret = snd_card_register(device->card);
1205 if (ret)
1206 goto out;
1207 return 0;
1208
1209out:
1210 pr_err("failed with %d\n", ret);
1211 return ret;
1212
1213}
1214
1215static int snd_compress_remove_device(struct snd_compr *device)
1216{
1217 return snd_card_free(device->card);
1218}
1219
1220
1221
1222
1223
1224
1225int snd_compress_register(struct snd_compr *device)
1226{
1227 int retval;
1228
1229 if (device->name == NULL || device->ops == NULL)
1230 return -EINVAL;
1231
1232 pr_debug("Registering compressed device %s\n", device->name);
1233 if (snd_BUG_ON(!device->ops->open))
1234 return -EINVAL;
1235 if (snd_BUG_ON(!device->ops->free))
1236 return -EINVAL;
1237 if (snd_BUG_ON(!device->ops->set_params))
1238 return -EINVAL;
1239 if (snd_BUG_ON(!device->ops->trigger))
1240 return -EINVAL;
1241
1242 mutex_init(&device->lock);
1243
1244
1245 mutex_lock(&device_mutex);
1246 retval = snd_compress_add_device(device);
1247 mutex_unlock(&device_mutex);
1248 return retval;
1249}
1250EXPORT_SYMBOL_GPL(snd_compress_register);
1251
1252int snd_compress_deregister(struct snd_compr *device)
1253{
1254 pr_debug("Removing compressed device %s\n", device->name);
1255 mutex_lock(&device_mutex);
1256 snd_compress_remove_device(device);
1257 mutex_unlock(&device_mutex);
1258 return 0;
1259}
1260EXPORT_SYMBOL_GPL(snd_compress_deregister);
1261
1262MODULE_DESCRIPTION("ALSA Compressed offload framework");
1263MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1264MODULE_LICENSE("GPL v2");
1265