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f2fs: support in batch fzero in dnode page
[linux-2.6/btrfs-unstable.git] / sound / core / compress_offload.c
bloba9933c07a6bf542e38b54ec8ed70204fbc429d55
1 /*
2 * compress_core.c - compress offload core
3 *
4 * Copyright (C) 2011 Intel Corporation
5 * Authors: Vinod Koul <vinod.koul@linux.intel.com>
6 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25 #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
27
28 #include <linux/file.h>
29 #include <linux/fs.h>
30 #include <linux/list.h>
31 #include <linux/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 <linux/compat.h>
42 #include <sound/core.h>
43 #include <sound/initval.h>
44 #include <sound/info.h>
45 #include <sound/compress_params.h>
46 #include <sound/compress_offload.h>
47 #include <sound/compress_driver.h>
48
49 /* struct snd_compr_codec_caps overflows the ioctl bit size for some
50 * architectures, so we need to disable the relevant ioctls.
51 */
52 #if _IOC_SIZEBITS < 14
53 #define COMPR_CODEC_CAPS_OVERFLOW
54 #endif
55
56 /* TODO:
57 * - add substream support for multiple devices in case of
58 * SND_DYNAMIC_MINORS is not used
59 * - Multiple node representation
60 * driver should be able to register multiple nodes
61 */
62
63 static DEFINE_MUTEX(device_mutex);
64
65 struct snd_compr_file {
66 unsigned long caps;
67 struct snd_compr_stream stream;
68 };
69
70 /*
71 * a note on stream states used:
72 * we use following states in the compressed core
73 * SNDRV_PCM_STATE_OPEN: When stream has been opened.
74 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
75 * calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
76 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
77 * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for
78 * playback only). User after setting up stream writes the data buffer
79 * before starting the stream.
80 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
81 * decoding/encoding and rendering/capturing data.
82 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
83 * by calling SNDRV_COMPRESS_DRAIN.
84 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
85 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
86 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
87 */
88 static int snd_compr_open(struct inode *inode, struct file *f)
89 {
90 struct snd_compr *compr;
91 struct snd_compr_file *data;
92 struct snd_compr_runtime *runtime;
93 enum snd_compr_direction dirn;
94 int maj = imajor(inode);
95 int ret;
96
97 if ((f->f_flags & O_ACCMODE) == O_WRONLY)
98 dirn = SND_COMPRESS_PLAYBACK;
99 else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
100 dirn = SND_COMPRESS_CAPTURE;
101 else
102 return -EINVAL;
103
104 if (maj == snd_major)
105 compr = snd_lookup_minor_data(iminor(inode),
106 SNDRV_DEVICE_TYPE_COMPRESS);
107 else
108 return -EBADFD;
109
110 if (compr == NULL) {
111 pr_err("no device data!!!\n");
112 return -ENODEV;
113 }
114
115 if (dirn != compr->direction) {
116 pr_err("this device doesn't support this direction\n");
117 snd_card_unref(compr->card);
118 return -EINVAL;
119 }
120
121 data = kzalloc(sizeof(*data), GFP_KERNEL);
122 if (!data) {
123 snd_card_unref(compr->card);
124 return -ENOMEM;
125 }
126 data->stream.ops = compr->ops;
127 data->stream.direction = dirn;
128 data->stream.private_data = compr->private_data;
129 data->stream.device = compr;
130 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
131 if (!runtime) {
132 kfree(data);
133 snd_card_unref(compr->card);
134 return -ENOMEM;
135 }
136 runtime->state = SNDRV_PCM_STATE_OPEN;
137 init_waitqueue_head(&runtime->sleep);
138 data->stream.runtime = runtime;
139 f->private_data = (void *)data;
140 mutex_lock(&compr->lock);
141 ret = compr->ops->open(&data->stream);
142 mutex_unlock(&compr->lock);
143 if (ret) {
144 kfree(runtime);
145 kfree(data);
146 }
147 snd_card_unref(compr->card);
148 return ret;
149 }
150
151 static int snd_compr_free(struct inode *inode, struct file *f)
152 {
153 struct snd_compr_file *data = f->private_data;
154 struct snd_compr_runtime *runtime = data->stream.runtime;
155
156 switch (runtime->state) {
157 case SNDRV_PCM_STATE_RUNNING:
158 case SNDRV_PCM_STATE_DRAINING:
159 case SNDRV_PCM_STATE_PAUSED:
160 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
161 break;
162 default:
163 break;
164 }
165
166 data->stream.ops->free(&data->stream);
167 kfree(data->stream.runtime->buffer);
168 kfree(data->stream.runtime);
169 kfree(data);
170 return 0;
171 }
172
173 static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
174 struct snd_compr_tstamp *tstamp)
175 {
176 if (!stream->ops->pointer)
177 return -ENOTSUPP;
178 stream->ops->pointer(stream, tstamp);
179 pr_debug("dsp consumed till %d total %d bytes\n",
180 tstamp->byte_offset, tstamp->copied_total);
181 if (stream->direction == SND_COMPRESS_PLAYBACK)
182 stream->runtime->total_bytes_transferred = tstamp->copied_total;
183 else
184 stream->runtime->total_bytes_available = tstamp->copied_total;
185 return 0;
186 }
187
188 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
189 struct snd_compr_avail *avail)
190 {
191 memset(avail, 0, sizeof(*avail));
192 snd_compr_update_tstamp(stream, &avail->tstamp);
193 /* Still need to return avail even if tstamp can't be filled in */
194
195 if (stream->runtime->total_bytes_available == 0 &&
196 stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
197 stream->direction == SND_COMPRESS_PLAYBACK) {
198 pr_debug("detected init and someone forgot to do a write\n");
199 return stream->runtime->buffer_size;
200 }
201 pr_debug("app wrote %lld, DSP consumed %lld\n",
202 stream->runtime->total_bytes_available,
203 stream->runtime->total_bytes_transferred);
204 if (stream->runtime->total_bytes_available ==
205 stream->runtime->total_bytes_transferred) {
206 if (stream->direction == SND_COMPRESS_PLAYBACK) {
207 pr_debug("both pointers are same, returning full avail\n");
208 return stream->runtime->buffer_size;
209 } else {
210 pr_debug("both pointers are same, returning no avail\n");
211 return 0;
212 }
213 }
214
215 avail->avail = stream->runtime->total_bytes_available -
216 stream->runtime->total_bytes_transferred;
217 if (stream->direction == SND_COMPRESS_PLAYBACK)
218 avail->avail = stream->runtime->buffer_size - avail->avail;
219
220 pr_debug("ret avail as %lld\n", avail->avail);
221 return avail->avail;
222 }
223
224 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
225 {
226 struct snd_compr_avail avail;
227
228 return snd_compr_calc_avail(stream, &avail);
229 }
230
231 static int
232 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
233 {
234 struct snd_compr_avail ioctl_avail;
235 size_t avail;
236
237 avail = snd_compr_calc_avail(stream, &ioctl_avail);
238 ioctl_avail.avail = avail;
239
240 if (copy_to_user((__u64 __user *)arg,
241 &ioctl_avail, sizeof(ioctl_avail)))
242 return -EFAULT;
243 return 0;
244 }
245
246 static int snd_compr_write_data(struct snd_compr_stream *stream,
247 const char __user *buf, size_t count)
248 {
249 void *dstn;
250 size_t copy;
251 struct snd_compr_runtime *runtime = stream->runtime;
252 /* 64-bit Modulus */
253 u64 app_pointer = div64_u64(runtime->total_bytes_available,
254 runtime->buffer_size);
255 app_pointer = runtime->total_bytes_available -
256 (app_pointer * runtime->buffer_size);
257
258 dstn = runtime->buffer + app_pointer;
259 pr_debug("copying %ld at %lld\n",
260 (unsigned long)count, app_pointer);
261 if (count < runtime->buffer_size - app_pointer) {
262 if (copy_from_user(dstn, buf, count))
263 return -EFAULT;
264 } else {
265 copy = runtime->buffer_size - app_pointer;
266 if (copy_from_user(dstn, buf, copy))
267 return -EFAULT;
268 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
269 return -EFAULT;
270 }
271 /* if DSP cares, let it know data has been written */
272 if (stream->ops->ack)
273 stream->ops->ack(stream, count);
274 return count;
275 }
276
277 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
278 size_t count, loff_t *offset)
279 {
280 struct snd_compr_file *data = f->private_data;
281 struct snd_compr_stream *stream;
282 size_t avail;
283 int retval;
284
285 if (snd_BUG_ON(!data))
286 return -EFAULT;
287
288 stream = &data->stream;
289 mutex_lock(&stream->device->lock);
290 /* write is allowed when stream is running or has been steup */
291 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
292 stream->runtime->state != SNDRV_PCM_STATE_PREPARED &&
293 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
294 mutex_unlock(&stream->device->lock);
295 return -EBADFD;
296 }
297
298 avail = snd_compr_get_avail(stream);
299 pr_debug("avail returned %ld\n", (unsigned long)avail);
300 /* calculate how much we can write to buffer */
301 if (avail > count)
302 avail = count;
303
304 if (stream->ops->copy) {
305 char __user* cbuf = (char __user*)buf;
306 retval = stream->ops->copy(stream, cbuf, avail);
307 } else {
308 retval = snd_compr_write_data(stream, buf, avail);
309 }
310 if (retval > 0)
311 stream->runtime->total_bytes_available += retval;
312
313 /* while initiating the stream, write should be called before START
314 * call, so in setup move state */
315 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
316 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
317 pr_debug("stream prepared, Houston we are good to go\n");
318 }
319
320 mutex_unlock(&stream->device->lock);
321 return retval;
322 }
323
324
325 static ssize_t snd_compr_read(struct file *f, char __user *buf,
326 size_t count, loff_t *offset)
327 {
328 struct snd_compr_file *data = f->private_data;
329 struct snd_compr_stream *stream;
330 size_t avail;
331 int retval;
332
333 if (snd_BUG_ON(!data))
334 return -EFAULT;
335
336 stream = &data->stream;
337 mutex_lock(&stream->device->lock);
338
339 /* read is allowed when stream is running, paused, draining and setup
340 * (yes setup is state which we transition to after stop, so if user
341 * wants to read data after stop we allow that)
342 */
343 switch (stream->runtime->state) {
344 case SNDRV_PCM_STATE_OPEN:
345 case SNDRV_PCM_STATE_PREPARED:
346 case SNDRV_PCM_STATE_XRUN:
347 case SNDRV_PCM_STATE_SUSPENDED:
348 case SNDRV_PCM_STATE_DISCONNECTED:
349 retval = -EBADFD;
350 goto out;
351 }
352
353 avail = snd_compr_get_avail(stream);
354 pr_debug("avail returned %ld\n", (unsigned long)avail);
355 /* calculate how much we can read from buffer */
356 if (avail > count)
357 avail = count;
358
359 if (stream->ops->copy) {
360 retval = stream->ops->copy(stream, buf, avail);
361 } else {
362 retval = -ENXIO;
363 goto out;
364 }
365 if (retval > 0)
366 stream->runtime->total_bytes_transferred += retval;
367
368 out:
369 mutex_unlock(&stream->device->lock);
370 return retval;
371 }
372
373 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
374 {
375 return -ENXIO;
376 }
377
378 static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
379 {
380 if (stream->direction == SND_COMPRESS_PLAYBACK)
381 return POLLOUT | POLLWRNORM;
382 else
383 return POLLIN | POLLRDNORM;
384 }
385
386 static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
387 {
388 struct snd_compr_file *data = f->private_data;
389 struct snd_compr_stream *stream;
390 size_t avail;
391 int retval = 0;
392
393 if (snd_BUG_ON(!data))
394 return -EFAULT;
395 stream = &data->stream;
396 if (snd_BUG_ON(!stream))
397 return -EFAULT;
398
399 mutex_lock(&stream->device->lock);
400 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
401 retval = -EBADFD;
402 goto out;
403 }
404 poll_wait(f, &stream->runtime->sleep, wait);
405
406 avail = snd_compr_get_avail(stream);
407 pr_debug("avail is %ld\n", (unsigned long)avail);
408 /* check if we have at least one fragment to fill */
409 switch (stream->runtime->state) {
410 case SNDRV_PCM_STATE_DRAINING:
411 /* stream has been woken up after drain is complete
412 * draining done so set stream state to stopped
413 */
414 retval = snd_compr_get_poll(stream);
415 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
416 break;
417 case SNDRV_PCM_STATE_RUNNING:
418 case SNDRV_PCM_STATE_PREPARED:
419 case SNDRV_PCM_STATE_PAUSED:
420 if (avail >= stream->runtime->fragment_size)
421 retval = snd_compr_get_poll(stream);
422 break;
423 default:
424 if (stream->direction == SND_COMPRESS_PLAYBACK)
425 retval = POLLOUT | POLLWRNORM | POLLERR;
426 else
427 retval = POLLIN | POLLRDNORM | POLLERR;
428 break;
429 }
430 out:
431 mutex_unlock(&stream->device->lock);
432 return retval;
433 }
434
435 static int
436 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
437 {
438 int retval;
439 struct snd_compr_caps caps;
440
441 if (!stream->ops->get_caps)
442 return -ENXIO;
443
444 memset(&caps, 0, sizeof(caps));
445 retval = stream->ops->get_caps(stream, &caps);
446 if (retval)
447 goto out;
448 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
449 retval = -EFAULT;
450 out:
451 return retval;
452 }
453
454 #ifndef COMPR_CODEC_CAPS_OVERFLOW
455 static int
456 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
457 {
458 int retval;
459 struct snd_compr_codec_caps *caps;
460
461 if (!stream->ops->get_codec_caps)
462 return -ENXIO;
463
464 caps = kzalloc(sizeof(*caps), GFP_KERNEL);
465 if (!caps)
466 return -ENOMEM;
467
468 retval = stream->ops->get_codec_caps(stream, caps);
469 if (retval)
470 goto out;
471 if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
472 retval = -EFAULT;
473
474 out:
475 kfree(caps);
476 return retval;
477 }
478 #endif /* !COMPR_CODEC_CAPS_OVERFLOW */
479
480 /* revisit this with snd_pcm_preallocate_xxx */
481 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
482 struct snd_compr_params *params)
483 {
484 unsigned int buffer_size;
485 void *buffer;
486
487 buffer_size = params->buffer.fragment_size * params->buffer.fragments;
488 if (stream->ops->copy) {
489 buffer = NULL;
490 /* if copy is defined the driver will be required to copy
491 * the data from core
492 */
493 } else {
494 buffer = kmalloc(buffer_size, GFP_KERNEL);
495 if (!buffer)
496 return -ENOMEM;
497 }
498 stream->runtime->fragment_size = params->buffer.fragment_size;
499 stream->runtime->fragments = params->buffer.fragments;
500 stream->runtime->buffer = buffer;
501 stream->runtime->buffer_size = buffer_size;
502 return 0;
503 }
504
505 static int snd_compress_check_input(struct snd_compr_params *params)
506 {
507 /* first let's check the buffer parameter's */
508 if (params->buffer.fragment_size == 0 ||
509 params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
510 return -EINVAL;
511
512 /* now codec parameters */
513 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
514 return -EINVAL;
515
516 if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
517 return -EINVAL;
518
519 return 0;
520 }
521
522 static int
523 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
524 {
525 struct snd_compr_params *params;
526 int retval;
527
528 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
529 /*
530 * we should allow parameter change only when stream has been
531 * opened not in other cases
532 */
533 params = kmalloc(sizeof(*params), GFP_KERNEL);
534 if (!params)
535 return -ENOMEM;
536 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
537 retval = -EFAULT;
538 goto out;
539 }
540
541 retval = snd_compress_check_input(params);
542 if (retval)
543 goto out;
544
545 retval = snd_compr_allocate_buffer(stream, params);
546 if (retval) {
547 retval = -ENOMEM;
548 goto out;
549 }
550
551 retval = stream->ops->set_params(stream, params);
552 if (retval)
553 goto out;
554
555 stream->metadata_set = false;
556 stream->next_track = false;
557
558 if (stream->direction == SND_COMPRESS_PLAYBACK)
559 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
560 else
561 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
562 } else {
563 return -EPERM;
564 }
565 out:
566 kfree(params);
567 return retval;
568 }
569
570 static int
571 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
572 {
573 struct snd_codec *params;
574 int retval;
575
576 if (!stream->ops->get_params)
577 return -EBADFD;
578
579 params = kzalloc(sizeof(*params), GFP_KERNEL);
580 if (!params)
581 return -ENOMEM;
582 retval = stream->ops->get_params(stream, params);
583 if (retval)
584 goto out;
585 if (copy_to_user((char __user *)arg, params, sizeof(*params)))
586 retval = -EFAULT;
587
588 out:
589 kfree(params);
590 return retval;
591 }
592
593 static int
594 snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
595 {
596 struct snd_compr_metadata metadata;
597 int retval;
598
599 if (!stream->ops->get_metadata)
600 return -ENXIO;
601
602 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
603 return -EFAULT;
604
605 retval = stream->ops->get_metadata(stream, &metadata);
606 if (retval != 0)
607 return retval;
608
609 if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
610 return -EFAULT;
611
612 return 0;
613 }
614
615 static int
616 snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
617 {
618 struct snd_compr_metadata metadata;
619 int retval;
620
621 if (!stream->ops->set_metadata)
622 return -ENXIO;
623 /*
624 * we should allow parameter change only when stream has been
625 * opened not in other cases
626 */
627 if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
628 return -EFAULT;
629
630 retval = stream->ops->set_metadata(stream, &metadata);
631 stream->metadata_set = true;
632
633 return retval;
634 }
635
636 static inline int
637 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
638 {
639 struct snd_compr_tstamp tstamp = {0};
640 int ret;
641
642 ret = snd_compr_update_tstamp(stream, &tstamp);
643 if (ret == 0)
644 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
645 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
646 return ret;
647 }
648
649 static int snd_compr_pause(struct snd_compr_stream *stream)
650 {
651 int retval;
652
653 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
654 return -EPERM;
655 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
656 if (!retval)
657 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
658 return retval;
659 }
660
661 static int snd_compr_resume(struct snd_compr_stream *stream)
662 {
663 int retval;
664
665 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
666 return -EPERM;
667 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
668 if (!retval)
669 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
670 return retval;
671 }
672
673 static int snd_compr_start(struct snd_compr_stream *stream)
674 {
675 int retval;
676
677 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
678 return -EPERM;
679 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
680 if (!retval)
681 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
682 return retval;
683 }
684
685 static int snd_compr_stop(struct snd_compr_stream *stream)
686 {
687 int retval;
688
689 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
690 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
691 return -EPERM;
692 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
693 if (!retval) {
694 snd_compr_drain_notify(stream);
695 stream->runtime->total_bytes_available = 0;
696 stream->runtime->total_bytes_transferred = 0;
697 }
698 return retval;
699 }
700
701 static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
702 {
703 int ret;
704
705 /*
706 * We are called with lock held. So drop the lock while we wait for
707 * drain complete notification from the driver
708 *
709 * It is expected that driver will notify the drain completion and then
710 * stream will be moved to SETUP state, even if draining resulted in an
711 * error. We can trigger next track after this.
712 */
713 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
714 mutex_unlock(&stream->device->lock);
715
716 /* we wait for drain to complete here, drain can return when
717 * interruption occurred, wait returned error or success.
718 * For the first two cases we don't do anything different here and
719 * return after waking up
720 */
721
722 ret = wait_event_interruptible(stream->runtime->sleep,
723 (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
724 if (ret == -ERESTARTSYS)
725 pr_debug("wait aborted by a signal");
726 else if (ret)
727 pr_debug("wait for drain failed with %d\n", ret);
728
729
730 wake_up(&stream->runtime->sleep);
731 mutex_lock(&stream->device->lock);
732
733 return ret;
734 }
735
736 static int snd_compr_drain(struct snd_compr_stream *stream)
737 {
738 int retval;
739
740 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
741 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
742 return -EPERM;
743
744 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
745 if (retval) {
746 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
747 wake_up(&stream->runtime->sleep);
748 return retval;
749 }
750
751 return snd_compress_wait_for_drain(stream);
752 }
753
754 static int snd_compr_next_track(struct snd_compr_stream *stream)
755 {
756 int retval;
757
758 /* only a running stream can transition to next track */
759 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
760 return -EPERM;
761
762 /* you can signal next track if this is intended to be a gapless stream
763 * and current track metadata is set
764 */
765 if (stream->metadata_set == false)
766 return -EPERM;
767
768 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
769 if (retval != 0)
770 return retval;
771 stream->metadata_set = false;
772 stream->next_track = true;
773 return 0;
774 }
775
776 static int snd_compr_partial_drain(struct snd_compr_stream *stream)
777 {
778 int retval;
779 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
780 stream->runtime->state == SNDRV_PCM_STATE_SETUP)
781 return -EPERM;
782 /* stream can be drained only when next track has been signalled */
783 if (stream->next_track == false)
784 return -EPERM;
785
786 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
787 if (retval) {
788 pr_debug("Partial drain returned failure\n");
789 wake_up(&stream->runtime->sleep);
790 return retval;
791 }
792
793 stream->next_track = false;
794 return snd_compress_wait_for_drain(stream);
795 }
796
797 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
798 {
799 struct snd_compr_file *data = f->private_data;
800 struct snd_compr_stream *stream;
801 int retval = -ENOTTY;
802
803 if (snd_BUG_ON(!data))
804 return -EFAULT;
805 stream = &data->stream;
806 if (snd_BUG_ON(!stream))
807 return -EFAULT;
808 mutex_lock(&stream->device->lock);
809 switch (_IOC_NR(cmd)) {
810 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
811 retval = put_user(SNDRV_COMPRESS_VERSION,
812 (int __user *)arg) ? -EFAULT : 0;
813 break;
814 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
815 retval = snd_compr_get_caps(stream, arg);
816 break;
817 #ifndef COMPR_CODEC_CAPS_OVERFLOW
818 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
819 retval = snd_compr_get_codec_caps(stream, arg);
820 break;
821 #endif
822 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
823 retval = snd_compr_set_params(stream, arg);
824 break;
825 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
826 retval = snd_compr_get_params(stream, arg);
827 break;
828 case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
829 retval = snd_compr_set_metadata(stream, arg);
830 break;
831 case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
832 retval = snd_compr_get_metadata(stream, arg);
833 break;
834 case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
835 retval = snd_compr_tstamp(stream, arg);
836 break;
837 case _IOC_NR(SNDRV_COMPRESS_AVAIL):
838 retval = snd_compr_ioctl_avail(stream, arg);
839 break;
840 case _IOC_NR(SNDRV_COMPRESS_PAUSE):
841 retval = snd_compr_pause(stream);
842 break;
843 case _IOC_NR(SNDRV_COMPRESS_RESUME):
844 retval = snd_compr_resume(stream);
845 break;
846 case _IOC_NR(SNDRV_COMPRESS_START):
847 retval = snd_compr_start(stream);
848 break;
849 case _IOC_NR(SNDRV_COMPRESS_STOP):
850 retval = snd_compr_stop(stream);
851 break;
852 case _IOC_NR(SNDRV_COMPRESS_DRAIN):
853 retval = snd_compr_drain(stream);
854 break;
855 case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
856 retval = snd_compr_partial_drain(stream);
857 break;
858 case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
859 retval = snd_compr_next_track(stream);
860 break;
861
862 }
863 mutex_unlock(&stream->device->lock);
864 return retval;
865 }
866
867 /* support of 32bit userspace on 64bit platforms */
868 #ifdef CONFIG_COMPAT
869 static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
870 unsigned long arg)
871 {
872 return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
873 }
874 #endif
875
876 static const struct file_operations snd_compr_file_ops = {
877 .owner = THIS_MODULE,
878 .open = snd_compr_open,
879 .release = snd_compr_free,
880 .write = snd_compr_write,
881 .read = snd_compr_read,
882 .unlocked_ioctl = snd_compr_ioctl,
883 #ifdef CONFIG_COMPAT
884 .compat_ioctl = snd_compr_ioctl_compat,
885 #endif
886 .mmap = snd_compr_mmap,
887 .poll = snd_compr_poll,
888 };
889
890 static int snd_compress_dev_register(struct snd_device *device)
891 {
892 int ret = -EINVAL;
893 char str[16];
894 struct snd_compr *compr;
895
896 if (snd_BUG_ON(!device || !device->device_data))
897 return -EBADFD;
898 compr = device->device_data;
899
900 pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
901 compr->direction);
902 /* register compressed device */
903 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
904 compr->card, compr->device,
905 &snd_compr_file_ops, compr, &compr->dev);
906 if (ret < 0) {
907 pr_err("snd_register_device failed\n %d", ret);
908 return ret;
909 }
910 return ret;
911
912 }
913
914 static int snd_compress_dev_disconnect(struct snd_device *device)
915 {
916 struct snd_compr *compr;
917
918 compr = device->device_data;
919 snd_unregister_device(&compr->dev);
920 return 0;
921 }
922
923 #ifdef CONFIG_SND_VERBOSE_PROCFS
924 static void snd_compress_proc_info_read(struct snd_info_entry *entry,
925 struct snd_info_buffer *buffer)
926 {
927 struct snd_compr *compr = (struct snd_compr *)entry->private_data;
928
929 snd_iprintf(buffer, "card: %d\n", compr->card->number);
930 snd_iprintf(buffer, "device: %d\n", compr->device);
931 snd_iprintf(buffer, "stream: %s\n",
932 compr->direction == SND_COMPRESS_PLAYBACK
933 ? "PLAYBACK" : "CAPTURE");
934 snd_iprintf(buffer, "id: %s\n", compr->id);
935 }
936
937 static int snd_compress_proc_init(struct snd_compr *compr)
938 {
939 struct snd_info_entry *entry;
940 char name[16];
941
942 sprintf(name, "compr%i", compr->device);
943 entry = snd_info_create_card_entry(compr->card, name,
944 compr->card->proc_root);
945 if (!entry)
946 return -ENOMEM;
947 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
948 if (snd_info_register(entry) < 0) {
949 snd_info_free_entry(entry);
950 return -ENOMEM;
951 }
952 compr->proc_root = entry;
953
954 entry = snd_info_create_card_entry(compr->card, "info",
955 compr->proc_root);
956 if (entry) {
957 snd_info_set_text_ops(entry, compr,
958 snd_compress_proc_info_read);
959 if (snd_info_register(entry) < 0) {
960 snd_info_free_entry(entry);
961 entry = NULL;
962 }
963 }
964 compr->proc_info_entry = entry;
965
966 return 0;
967 }
968
969 static void snd_compress_proc_done(struct snd_compr *compr)
970 {
971 snd_info_free_entry(compr->proc_info_entry);
972 compr->proc_info_entry = NULL;
973 snd_info_free_entry(compr->proc_root);
974 compr->proc_root = NULL;
975 }
976
977 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
978 {
979 strlcpy(compr->id, id, sizeof(compr->id));
980 }
981 #else
982 static inline int snd_compress_proc_init(struct snd_compr *compr)
983 {
984 return 0;
985 }
986
987 static inline void snd_compress_proc_done(struct snd_compr *compr)
988 {
989 }
990
991 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
992 {
993 }
994 #endif
995
996 static int snd_compress_dev_free(struct snd_device *device)
997 {
998 struct snd_compr *compr;
999
1000 compr = device->device_data;
1001 snd_compress_proc_done(compr);
1002 put_device(&compr->dev);
1003 return 0;
1004 }
1005
1006 /*
1007 * snd_compress_new: create new compress device
1008 * @card: sound card pointer
1009 * @device: device number
1010 * @dirn: device direction, should be of type enum snd_compr_direction
1011 * @compr: compress device pointer
1012 */
1013 int snd_compress_new(struct snd_card *card, int device,
1014 int dirn, const char *id, struct snd_compr *compr)
1015 {
1016 static struct snd_device_ops ops = {
1017 .dev_free = snd_compress_dev_free,
1018 .dev_register = snd_compress_dev_register,
1019 .dev_disconnect = snd_compress_dev_disconnect,
1020 };
1021 int ret;
1022
1023 compr->card = card;
1024 compr->device = device;
1025 compr->direction = dirn;
1026
1027 snd_compress_set_id(compr, id);
1028
1029 snd_device_initialize(&compr->dev, card);
1030 dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1031
1032 ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1033 if (ret == 0)
1034 snd_compress_proc_init(compr);
1035
1036 return ret;
1037 }
1038 EXPORT_SYMBOL_GPL(snd_compress_new);
1039
1040 static int snd_compress_add_device(struct snd_compr *device)
1041 {
1042 int ret;
1043
1044 if (!device->card)
1045 return -EINVAL;
1046
1047 /* register the card */
1048 ret = snd_card_register(device->card);
1049 if (ret)
1050 goto out;
1051 return 0;
1052
1053 out:
1054 pr_err("failed with %d\n", ret);
1055 return ret;
1056
1057 }
1058
1059 static int snd_compress_remove_device(struct snd_compr *device)
1060 {
1061 return snd_card_free(device->card);
1062 }
1063
1064 /**
1065 * snd_compress_register - register compressed device
1066 *
1067 * @device: compressed device to register
1068 */
1069 int snd_compress_register(struct snd_compr *device)
1070 {
1071 int retval;
1072
1073 if (device->name == NULL || device->ops == NULL)
1074 return -EINVAL;
1075
1076 pr_debug("Registering compressed device %s\n", device->name);
1077 if (snd_BUG_ON(!device->ops->open))
1078 return -EINVAL;
1079 if (snd_BUG_ON(!device->ops->free))
1080 return -EINVAL;
1081 if (snd_BUG_ON(!device->ops->set_params))
1082 return -EINVAL;
1083 if (snd_BUG_ON(!device->ops->trigger))
1084 return -EINVAL;
1085
1086 mutex_init(&device->lock);
1087
1088 /* register a compressed card */
1089 mutex_lock(&device_mutex);
1090 retval = snd_compress_add_device(device);
1091 mutex_unlock(&device_mutex);
1092 return retval;
1093 }
1094 EXPORT_SYMBOL_GPL(snd_compress_register);
1095
1096 int snd_compress_deregister(struct snd_compr *device)
1097 {
1098 pr_debug("Removing compressed device %s\n", device->name);
1099 mutex_lock(&device_mutex);
1100 snd_compress_remove_device(device);
1101 mutex_unlock(&device_mutex);
1102 return 0;
1103 }
1104 EXPORT_SYMBOL_GPL(snd_compress_deregister);
1105
1106 static int __init snd_compress_init(void)
1107 {
1108 return 0;
1109 }
1110
1111 static void __exit snd_compress_exit(void)
1112 {
1113 }
1114
1115 module_init(snd_compress_init);
1116 module_exit(snd_compress_exit);
1117
1118 MODULE_DESCRIPTION("ALSA Compressed offload framework");
1119 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1120 MODULE_LICENSE("GPL v2");
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