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