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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
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
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69
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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 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
713 return -EPERM;
714 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
715 if (!retval)
716 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
717 return retval;
718}
719
720static int snd_compr_resume(struct snd_compr_stream *stream)
721{
722 int retval;
723
724 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
725 return -EPERM;
726 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
727 if (!retval)
728 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
729 return retval;
730}
731
732static int snd_compr_start(struct snd_compr_stream *stream)
733{
734 int retval;
735
736 switch (stream->runtime->state) {
737 case SNDRV_PCM_STATE_SETUP:
738 if (stream->direction != SND_COMPRESS_CAPTURE)
739 return -EPERM;
740 break;
741 case SNDRV_PCM_STATE_PREPARED:
742 break;
743 default:
744 return -EPERM;
745 }
746
747 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
748 if (!retval)
749 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
750 return retval;
751}
752
753static int snd_compr_stop(struct snd_compr_stream *stream)
754{
755 int retval;
756
757 switch (stream->runtime->state) {
758 case SNDRV_PCM_STATE_OPEN:
759 case SNDRV_PCM_STATE_SETUP:
760 case SNDRV_PCM_STATE_PREPARED:
761 return -EPERM;
762 default:
763 break;
764 }
765
766 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
767 if (!retval) {
768
769 stream->partial_drain = false;
770 stream->metadata_set = false;
771 snd_compr_drain_notify(stream);
772 stream->runtime->total_bytes_available = 0;
773 stream->runtime->total_bytes_transferred = 0;
774 }
775 return retval;
776}
777
778static void error_delayed_work(struct work_struct *work)
779{
780 struct snd_compr_stream *stream;
781
782 stream = container_of(work, struct snd_compr_stream, error_work.work);
783
784 mutex_lock(&stream->device->lock);
785
786 stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
787 wake_up(&stream->runtime->sleep);
788
789 mutex_unlock(&stream->device->lock);
790}
791
792
793
794
795
796
797
798
799
800
801int snd_compr_stop_error(struct snd_compr_stream *stream,
802 snd_pcm_state_t state)
803{
804 if (stream->runtime->state == state)
805 return 0;
806
807 stream->runtime->state = state;
808
809 pr_debug("Changing state to: %d\n", state);
810
811 queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
812
813 return 0;
814}
815EXPORT_SYMBOL_GPL(snd_compr_stop_error);
816
817static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
818{
819 int ret;
820
821
822
823
824
825
826
827
828
829 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
830 mutex_unlock(&stream->device->lock);
831
832
833
834
835
836
837
838 ret = wait_event_interruptible(stream->runtime->sleep,
839 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
840 if (ret == -ERESTARTSYS)
841 pr_debug("wait aborted by a signal\n");
842 else if (ret)
843 pr_debug("wait for drain failed with %d\n", ret);
844
845
846 wake_up(&stream->runtime->sleep);
847 mutex_lock(&stream->device->lock);
848
849 return ret;
850}
851
852static int snd_compr_drain(struct snd_compr_stream *stream)
853{
854 int retval;
855
856 switch (stream->runtime->state) {
857 case SNDRV_PCM_STATE_OPEN:
858 case SNDRV_PCM_STATE_SETUP:
859 case SNDRV_PCM_STATE_PREPARED:
860 case SNDRV_PCM_STATE_PAUSED:
861 return -EPERM;
862 case SNDRV_PCM_STATE_XRUN:
863 return -EPIPE;
864 default:
865 break;
866 }
867
868 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
869 if (retval) {
870 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
871 wake_up(&stream->runtime->sleep);
872 return retval;
873 }
874
875 return snd_compress_wait_for_drain(stream);
876}
877
878static int snd_compr_next_track(struct snd_compr_stream *stream)
879{
880 int retval;
881
882
883 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
884 return -EPERM;
885
886
887 if (stream->direction == SND_COMPRESS_CAPTURE)
888 return -EPERM;
889
890
891
892
893 if (stream->metadata_set == false)
894 return -EPERM;
895
896 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
897 if (retval != 0)
898 return retval;
899 stream->metadata_set = false;
900 stream->next_track = true;
901 return 0;
902}
903
904static int snd_compr_partial_drain(struct snd_compr_stream *stream)
905{
906 int retval;
907
908 switch (stream->runtime->state) {
909 case SNDRV_PCM_STATE_OPEN:
910 case SNDRV_PCM_STATE_SETUP:
911 case SNDRV_PCM_STATE_PREPARED:
912 case SNDRV_PCM_STATE_PAUSED:
913 return -EPERM;
914 case SNDRV_PCM_STATE_XRUN:
915 return -EPIPE;
916 default:
917 break;
918 }
919
920
921 if (stream->direction == SND_COMPRESS_CAPTURE)
922 return -EPERM;
923
924
925 if (stream->next_track == false)
926 return -EPERM;
927
928 stream->partial_drain = true;
929 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
930 if (retval) {
931 pr_debug("Partial drain returned failure\n");
932 wake_up(&stream->runtime->sleep);
933 return retval;
934 }
935
936 stream->next_track = false;
937 return snd_compress_wait_for_drain(stream);
938}
939
940static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
941{
942 struct snd_compr_file *data = f->private_data;
943 struct snd_compr_stream *stream;
944 int retval = -ENOTTY;
945
946 if (snd_BUG_ON(!data))
947 return -EFAULT;
948
949 stream = &data->stream;
950
951 mutex_lock(&stream->device->lock);
952 switch (_IOC_NR(cmd)) {
953 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
954 retval = put_user(SNDRV_COMPRESS_VERSION,
955 (int __user *)arg) ? -EFAULT : 0;
956 break;
957 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
958 retval = snd_compr_get_caps(stream, arg);
959 break;
960#ifndef COMPR_CODEC_CAPS_OVERFLOW
961 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
962 retval = snd_compr_get_codec_caps(stream, arg);
963 break;
964#endif
965 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
966 retval = snd_compr_set_params(stream, arg);
967 break;
968 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
969 retval = snd_compr_get_params(stream, arg);
970 break;
971 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
972 retval = snd_compr_set_metadata(stream, arg);
973 break;
974 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
975 retval = snd_compr_get_metadata(stream, arg);
976 break;
977 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
978 retval = snd_compr_tstamp(stream, arg);
979 break;
980 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
981 retval = snd_compr_ioctl_avail(stream, arg);
982 break;
983 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
984 retval = snd_compr_pause(stream);
985 break;
986 case _IOC_NR(SNDRV_COMPRESS_RESUME):
987 retval = snd_compr_resume(stream);
988 break;
989 case _IOC_NR(SNDRV_COMPRESS_START):
990 retval = snd_compr_start(stream);
991 break;
992 case _IOC_NR(SNDRV_COMPRESS_STOP):
993 retval = snd_compr_stop(stream);
994 break;
995 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
996 retval = snd_compr_drain(stream);
997 break;
998 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
999 retval = snd_compr_partial_drain(stream);
1000 break;
1001 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
1002 retval = snd_compr_next_track(stream);
1003 break;
1004
1005 }
1006 mutex_unlock(&stream->device->lock);
1007 return retval;
1008}
1009
1010
1011#ifdef CONFIG_COMPAT
1012static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
1013 unsigned long arg)
1014{
1015 return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
1016}
1017#endif
1018
1019static const struct file_operations snd_compr_file_ops = {
1020 .owner = THIS_MODULE,
1021 .open = snd_compr_open,
1022 .release = snd_compr_free,
1023 .write = snd_compr_write,
1024 .read = snd_compr_read,
1025 .unlocked_ioctl = snd_compr_ioctl,
1026#ifdef CONFIG_COMPAT
1027 .compat_ioctl = snd_compr_ioctl_compat,
1028#endif
1029 .mmap = snd_compr_mmap,
1030 .poll = snd_compr_poll,
1031};
1032
1033static int snd_compress_dev_register(struct snd_device *device)
1034{
1035 int ret;
1036 struct snd_compr *compr;
1037
1038 if (snd_BUG_ON(!device || !device->device_data))
1039 return -EBADFD;
1040 compr = device->device_data;
1041
1042 pr_debug("reg device %s, direction %d\n", compr->name,
1043 compr->direction);
1044
1045 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
1046 compr->card, compr->device,
1047 &snd_compr_file_ops, compr, &compr->dev);
1048 if (ret < 0) {
1049 pr_err("snd_register_device failed %d\n", ret);
1050 return ret;
1051 }
1052 return ret;
1053
1054}
1055
1056static int snd_compress_dev_disconnect(struct snd_device *device)
1057{
1058 struct snd_compr *compr;
1059
1060 compr = device->device_data;
1061 snd_unregister_device(&compr->dev);
1062 return 0;
1063}
1064
1065#ifdef CONFIG_SND_VERBOSE_PROCFS
1066static void snd_compress_proc_info_read(struct snd_info_entry *entry,
1067 struct snd_info_buffer *buffer)
1068{
1069 struct snd_compr *compr = (struct snd_compr *)entry->private_data;
1070
1071 snd_iprintf(buffer, "card: %d\n", compr->card->number);
1072 snd_iprintf(buffer, "device: %d\n", compr->device);
1073 snd_iprintf(buffer, "stream: %s\n",
1074 compr->direction == SND_COMPRESS_PLAYBACK
1075 ? "PLAYBACK" : "CAPTURE");
1076 snd_iprintf(buffer, "id: %s\n", compr->id);
1077}
1078
1079static int snd_compress_proc_init(struct snd_compr *compr)
1080{
1081 struct snd_info_entry *entry;
1082 char name[16];
1083
1084 sprintf(name, "compr%i", compr->device);
1085 entry = snd_info_create_card_entry(compr->card, name,
1086 compr->card->proc_root);
1087 if (!entry)
1088 return -ENOMEM;
1089 entry->mode = S_IFDIR | 0555;
1090 compr->proc_root = entry;
1091
1092 entry = snd_info_create_card_entry(compr->card, "info",
1093 compr->proc_root);
1094 if (entry)
1095 snd_info_set_text_ops(entry, compr,
1096 snd_compress_proc_info_read);
1097 compr->proc_info_entry = entry;
1098
1099 return 0;
1100}
1101
1102static void snd_compress_proc_done(struct snd_compr *compr)
1103{
1104 snd_info_free_entry(compr->proc_info_entry);
1105 compr->proc_info_entry = NULL;
1106 snd_info_free_entry(compr->proc_root);
1107 compr->proc_root = NULL;
1108}
1109
1110static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1111{
1112 strlcpy(compr->id, id, sizeof(compr->id));
1113}
1114#else
1115static inline int snd_compress_proc_init(struct snd_compr *compr)
1116{
1117 return 0;
1118}
1119
1120static inline void snd_compress_proc_done(struct snd_compr *compr)
1121{
1122}
1123
1124static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1125{
1126}
1127#endif
1128
1129static int snd_compress_dev_free(struct snd_device *device)
1130{
1131 struct snd_compr *compr;
1132
1133 compr = device->device_data;
1134 snd_compress_proc_done(compr);
1135 put_device(&compr->dev);
1136 return 0;
1137}
1138
1139
1140
1141
1142
1143
1144
1145
1146int snd_compress_new(struct snd_card *card, int device,
1147 int dirn, const char *id, struct snd_compr *compr)
1148{
1149 static const struct snd_device_ops ops = {
1150 .dev_free = snd_compress_dev_free,
1151 .dev_register = snd_compress_dev_register,
1152 .dev_disconnect = snd_compress_dev_disconnect,
1153 };
1154 int ret;
1155
1156 compr->card = card;
1157 compr->device = device;
1158 compr->direction = dirn;
1159
1160 snd_compress_set_id(compr, id);
1161
1162 snd_device_initialize(&compr->dev, card);
1163 dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1164
1165 ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1166 if (ret == 0)
1167 snd_compress_proc_init(compr);
1168
1169 return ret;
1170}
1171EXPORT_SYMBOL_GPL(snd_compress_new);
1172
1173static int snd_compress_add_device(struct snd_compr *device)
1174{
1175 int ret;
1176
1177 if (!device->card)
1178 return -EINVAL;
1179
1180
1181 ret = snd_card_register(device->card);
1182 if (ret)
1183 goto out;
1184 return 0;
1185
1186out:
1187 pr_err("failed with %d\n", ret);
1188 return ret;
1189
1190}
1191
1192static int snd_compress_remove_device(struct snd_compr *device)
1193{
1194 return snd_card_free(device->card);
1195}
1196
1197
1198
1199
1200
1201
1202int snd_compress_register(struct snd_compr *device)
1203{
1204 int retval;
1205
1206 if (device->name == NULL || device->ops == NULL)
1207 return -EINVAL;
1208
1209 pr_debug("Registering compressed device %s\n", device->name);
1210 if (snd_BUG_ON(!device->ops->open))
1211 return -EINVAL;
1212 if (snd_BUG_ON(!device->ops->free))
1213 return -EINVAL;
1214 if (snd_BUG_ON(!device->ops->set_params))
1215 return -EINVAL;
1216 if (snd_BUG_ON(!device->ops->trigger))
1217 return -EINVAL;
1218
1219 mutex_init(&device->lock);
1220
1221
1222 mutex_lock(&device_mutex);
1223 retval = snd_compress_add_device(device);
1224 mutex_unlock(&device_mutex);
1225 return retval;
1226}
1227EXPORT_SYMBOL_GPL(snd_compress_register);
1228
1229int snd_compress_deregister(struct snd_compr *device)
1230{
1231 pr_debug("Removing compressed device %s\n", device->name);
1232 mutex_lock(&device_mutex);
1233 snd_compress_remove_device(device);
1234 mutex_unlock(&device_mutex);
1235 return 0;
1236}
1237EXPORT_SYMBOL_GPL(snd_compress_deregister);
1238
1239MODULE_DESCRIPTION("ALSA Compressed offload framework");
1240MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1241MODULE_LICENSE("GPL v2");
1242