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b21c60a4 VK |
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> | |
f0283b58 | 31 | #include <linux/math64.h> |
b21c60a4 VK |
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> | |
f0283b58 | 37 | #include <linux/types.h> |
b21c60a4 VK |
38 | #include <linux/uio.h> |
39 | #include <linux/uaccess.h> | |
40 | #include <linux/module.h> | |
41 | #include <sound/core.h> | |
42 | #include <sound/initval.h> | |
43 | #include <sound/compress_params.h> | |
44 | #include <sound/compress_offload.h> | |
45 | #include <sound/compress_driver.h> | |
46 | ||
47 | /* TODO: | |
48 | * - add substream support for multiple devices in case of | |
49 | * SND_DYNAMIC_MINORS is not used | |
50 | * - Multiple node representation | |
51 | * driver should be able to register multiple nodes | |
52 | */ | |
53 | ||
54 | static DEFINE_MUTEX(device_mutex); | |
55 | ||
56 | struct snd_compr_file { | |
57 | unsigned long caps; | |
58 | struct snd_compr_stream stream; | |
59 | }; | |
60 | ||
61 | /* | |
62 | * a note on stream states used: | |
63 | * we use follwing states in the compressed core | |
64 | * SNDRV_PCM_STATE_OPEN: When stream has been opened. | |
65 | * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by | |
66 | * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this | |
67 | * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain. | |
68 | * SNDRV_PCM_STATE_RUNNING: When stream has been started and is | |
69 | * decoding/encoding and rendering/capturing data. | |
70 | * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done | |
71 | * by calling SNDRV_COMPRESS_DRAIN. | |
72 | * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling | |
73 | * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling | |
74 | * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively. | |
75 | */ | |
76 | static int snd_compr_open(struct inode *inode, struct file *f) | |
77 | { | |
78 | struct snd_compr *compr; | |
79 | struct snd_compr_file *data; | |
80 | struct snd_compr_runtime *runtime; | |
81 | enum snd_compr_direction dirn; | |
82 | int maj = imajor(inode); | |
83 | int ret; | |
84 | ||
81cb3246 | 85 | if ((f->f_flags & O_ACCMODE) == O_WRONLY) |
b21c60a4 | 86 | dirn = SND_COMPRESS_PLAYBACK; |
81cb3246 | 87 | else if ((f->f_flags & O_ACCMODE) == O_RDONLY) |
b21c60a4 | 88 | dirn = SND_COMPRESS_CAPTURE; |
81cb3246 | 89 | else |
b21c60a4 | 90 | return -EINVAL; |
b21c60a4 VK |
91 | |
92 | if (maj == snd_major) | |
93 | compr = snd_lookup_minor_data(iminor(inode), | |
94 | SNDRV_DEVICE_TYPE_COMPRESS); | |
95 | else | |
96 | return -EBADFD; | |
97 | ||
98 | if (compr == NULL) { | |
99 | pr_err("no device data!!!\n"); | |
100 | return -ENODEV; | |
101 | } | |
102 | ||
103 | if (dirn != compr->direction) { | |
104 | pr_err("this device doesn't support this direction\n"); | |
a0830dbd | 105 | snd_card_unref(compr->card); |
b21c60a4 VK |
106 | return -EINVAL; |
107 | } | |
108 | ||
109 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
a0830dbd TI |
110 | if (!data) { |
111 | snd_card_unref(compr->card); | |
b21c60a4 | 112 | return -ENOMEM; |
a0830dbd | 113 | } |
b21c60a4 VK |
114 | data->stream.ops = compr->ops; |
115 | data->stream.direction = dirn; | |
116 | data->stream.private_data = compr->private_data; | |
117 | data->stream.device = compr; | |
118 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); | |
119 | if (!runtime) { | |
120 | kfree(data); | |
a0830dbd | 121 | snd_card_unref(compr->card); |
b21c60a4 VK |
122 | return -ENOMEM; |
123 | } | |
124 | runtime->state = SNDRV_PCM_STATE_OPEN; | |
125 | init_waitqueue_head(&runtime->sleep); | |
126 | data->stream.runtime = runtime; | |
127 | f->private_data = (void *)data; | |
128 | mutex_lock(&compr->lock); | |
129 | ret = compr->ops->open(&data->stream); | |
130 | mutex_unlock(&compr->lock); | |
131 | if (ret) { | |
132 | kfree(runtime); | |
133 | kfree(data); | |
134 | } | |
a0830dbd | 135 | snd_card_unref(compr->card); |
749d3223 | 136 | return ret; |
b21c60a4 VK |
137 | } |
138 | ||
139 | static int snd_compr_free(struct inode *inode, struct file *f) | |
140 | { | |
141 | struct snd_compr_file *data = f->private_data; | |
b26d19e4 LG |
142 | struct snd_compr_runtime *runtime = data->stream.runtime; |
143 | ||
144 | switch (runtime->state) { | |
145 | case SNDRV_PCM_STATE_RUNNING: | |
146 | case SNDRV_PCM_STATE_DRAINING: | |
147 | case SNDRV_PCM_STATE_PAUSED: | |
148 | data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP); | |
149 | break; | |
150 | default: | |
151 | break; | |
152 | } | |
153 | ||
b21c60a4 VK |
154 | data->stream.ops->free(&data->stream); |
155 | kfree(data->stream.runtime->buffer); | |
156 | kfree(data->stream.runtime); | |
157 | kfree(data); | |
158 | return 0; | |
159 | } | |
160 | ||
17ac8e5c | 161 | static int snd_compr_update_tstamp(struct snd_compr_stream *stream, |
b21c60a4 VK |
162 | struct snd_compr_tstamp *tstamp) |
163 | { | |
164 | if (!stream->ops->pointer) | |
17ac8e5c | 165 | return -ENOTSUPP; |
b21c60a4 VK |
166 | stream->ops->pointer(stream, tstamp); |
167 | pr_debug("dsp consumed till %d total %d bytes\n", | |
168 | tstamp->byte_offset, tstamp->copied_total); | |
5b1f79f7 CK |
169 | if (stream->direction == SND_COMPRESS_PLAYBACK) |
170 | stream->runtime->total_bytes_transferred = tstamp->copied_total; | |
171 | else | |
172 | stream->runtime->total_bytes_available = tstamp->copied_total; | |
17ac8e5c | 173 | return 0; |
b21c60a4 VK |
174 | } |
175 | ||
176 | static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, | |
177 | struct snd_compr_avail *avail) | |
178 | { | |
17ac8e5c | 179 | memset(avail, 0, sizeof(*avail)); |
b21c60a4 | 180 | snd_compr_update_tstamp(stream, &avail->tstamp); |
17ac8e5c | 181 | /* Still need to return avail even if tstamp can't be filled in */ |
b21c60a4 | 182 | |
b21c60a4 | 183 | if (stream->runtime->total_bytes_available == 0 && |
5b1f79f7 CK |
184 | stream->runtime->state == SNDRV_PCM_STATE_SETUP && |
185 | stream->direction == SND_COMPRESS_PLAYBACK) { | |
b21c60a4 VK |
186 | pr_debug("detected init and someone forgot to do a write\n"); |
187 | return stream->runtime->buffer_size; | |
188 | } | |
189 | pr_debug("app wrote %lld, DSP consumed %lld\n", | |
190 | stream->runtime->total_bytes_available, | |
191 | stream->runtime->total_bytes_transferred); | |
192 | if (stream->runtime->total_bytes_available == | |
193 | stream->runtime->total_bytes_transferred) { | |
5b1f79f7 CK |
194 | if (stream->direction == SND_COMPRESS_PLAYBACK) { |
195 | pr_debug("both pointers are same, returning full avail\n"); | |
196 | return stream->runtime->buffer_size; | |
197 | } else { | |
198 | pr_debug("both pointers are same, returning no avail\n"); | |
199 | return 0; | |
200 | } | |
b21c60a4 VK |
201 | } |
202 | ||
5b1f79f7 CK |
203 | avail->avail = stream->runtime->total_bytes_available - |
204 | stream->runtime->total_bytes_transferred; | |
205 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
206 | avail->avail = stream->runtime->buffer_size - avail->avail; | |
207 | ||
4c28e32d CK |
208 | pr_debug("ret avail as %lld\n", avail->avail); |
209 | return avail->avail; | |
b21c60a4 VK |
210 | } |
211 | ||
212 | static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) | |
213 | { | |
214 | struct snd_compr_avail avail; | |
215 | ||
216 | return snd_compr_calc_avail(stream, &avail); | |
217 | } | |
218 | ||
219 | static int | |
220 | snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) | |
221 | { | |
222 | struct snd_compr_avail ioctl_avail; | |
223 | size_t avail; | |
224 | ||
225 | avail = snd_compr_calc_avail(stream, &ioctl_avail); | |
226 | ioctl_avail.avail = avail; | |
227 | ||
228 | if (copy_to_user((__u64 __user *)arg, | |
229 | &ioctl_avail, sizeof(ioctl_avail))) | |
230 | return -EFAULT; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int snd_compr_write_data(struct snd_compr_stream *stream, | |
235 | const char __user *buf, size_t count) | |
236 | { | |
237 | void *dstn; | |
238 | size_t copy; | |
239 | struct snd_compr_runtime *runtime = stream->runtime; | |
f0283b58 CK |
240 | /* 64-bit Modulus */ |
241 | u64 app_pointer = div64_u64(runtime->total_bytes_available, | |
242 | runtime->buffer_size); | |
243 | app_pointer = runtime->total_bytes_available - | |
244 | (app_pointer * runtime->buffer_size); | |
b21c60a4 | 245 | |
f0283b58 | 246 | dstn = runtime->buffer + app_pointer; |
b21c60a4 | 247 | pr_debug("copying %ld at %lld\n", |
f0283b58 CK |
248 | (unsigned long)count, app_pointer); |
249 | if (count < runtime->buffer_size - app_pointer) { | |
b21c60a4 VK |
250 | if (copy_from_user(dstn, buf, count)) |
251 | return -EFAULT; | |
b21c60a4 | 252 | } else { |
f0283b58 | 253 | copy = runtime->buffer_size - app_pointer; |
b21c60a4 VK |
254 | if (copy_from_user(dstn, buf, copy)) |
255 | return -EFAULT; | |
256 | if (copy_from_user(runtime->buffer, buf + copy, count - copy)) | |
257 | return -EFAULT; | |
b21c60a4 VK |
258 | } |
259 | /* if DSP cares, let it know data has been written */ | |
260 | if (stream->ops->ack) | |
261 | stream->ops->ack(stream, count); | |
262 | return count; | |
263 | } | |
264 | ||
265 | static ssize_t snd_compr_write(struct file *f, const char __user *buf, | |
266 | size_t count, loff_t *offset) | |
267 | { | |
268 | struct snd_compr_file *data = f->private_data; | |
269 | struct snd_compr_stream *stream; | |
270 | size_t avail; | |
271 | int retval; | |
272 | ||
273 | if (snd_BUG_ON(!data)) | |
274 | return -EFAULT; | |
275 | ||
276 | stream = &data->stream; | |
277 | mutex_lock(&stream->device->lock); | |
278 | /* write is allowed when stream is running or has been steup */ | |
279 | if (stream->runtime->state != SNDRV_PCM_STATE_SETUP && | |
280 | stream->runtime->state != SNDRV_PCM_STATE_RUNNING) { | |
281 | mutex_unlock(&stream->device->lock); | |
282 | return -EBADFD; | |
283 | } | |
284 | ||
285 | avail = snd_compr_get_avail(stream); | |
286 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
287 | /* calculate how much we can write to buffer */ | |
288 | if (avail > count) | |
289 | avail = count; | |
290 | ||
4daf891c CK |
291 | if (stream->ops->copy) { |
292 | char __user* cbuf = (char __user*)buf; | |
293 | retval = stream->ops->copy(stream, cbuf, avail); | |
294 | } else { | |
b21c60a4 | 295 | retval = snd_compr_write_data(stream, buf, avail); |
4daf891c | 296 | } |
b21c60a4 VK |
297 | if (retval > 0) |
298 | stream->runtime->total_bytes_available += retval; | |
299 | ||
300 | /* while initiating the stream, write should be called before START | |
301 | * call, so in setup move state */ | |
302 | if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) { | |
303 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
304 | pr_debug("stream prepared, Houston we are good to go\n"); | |
305 | } | |
306 | ||
307 | mutex_unlock(&stream->device->lock); | |
308 | return retval; | |
309 | } | |
310 | ||
311 | ||
312 | static ssize_t snd_compr_read(struct file *f, char __user *buf, | |
313 | size_t count, loff_t *offset) | |
314 | { | |
49bb6402 CK |
315 | struct snd_compr_file *data = f->private_data; |
316 | struct snd_compr_stream *stream; | |
317 | size_t avail; | |
318 | int retval; | |
319 | ||
320 | if (snd_BUG_ON(!data)) | |
321 | return -EFAULT; | |
322 | ||
323 | stream = &data->stream; | |
324 | mutex_lock(&stream->device->lock); | |
325 | ||
75481347 VK |
326 | /* read is allowed when stream is running, paused, draining and setup |
327 | * (yes setup is state which we transition to after stop, so if user | |
328 | * wants to read data after stop we allow that) | |
329 | */ | |
330 | switch (stream->runtime->state) { | |
331 | case SNDRV_PCM_STATE_OPEN: | |
332 | case SNDRV_PCM_STATE_PREPARED: | |
333 | case SNDRV_PCM_STATE_XRUN: | |
334 | case SNDRV_PCM_STATE_SUSPENDED: | |
335 | case SNDRV_PCM_STATE_DISCONNECTED: | |
49bb6402 CK |
336 | retval = -EBADFD; |
337 | goto out; | |
338 | } | |
339 | ||
340 | avail = snd_compr_get_avail(stream); | |
341 | pr_debug("avail returned %ld\n", (unsigned long)avail); | |
342 | /* calculate how much we can read from buffer */ | |
343 | if (avail > count) | |
344 | avail = count; | |
345 | ||
346 | if (stream->ops->copy) { | |
347 | retval = stream->ops->copy(stream, buf, avail); | |
348 | } else { | |
349 | retval = -ENXIO; | |
350 | goto out; | |
351 | } | |
352 | if (retval > 0) | |
353 | stream->runtime->total_bytes_transferred += retval; | |
354 | ||
355 | out: | |
356 | mutex_unlock(&stream->device->lock); | |
357 | return retval; | |
b21c60a4 VK |
358 | } |
359 | ||
360 | static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) | |
361 | { | |
362 | return -ENXIO; | |
363 | } | |
364 | ||
365 | static inline int snd_compr_get_poll(struct snd_compr_stream *stream) | |
366 | { | |
367 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
368 | return POLLOUT | POLLWRNORM; | |
369 | else | |
370 | return POLLIN | POLLRDNORM; | |
371 | } | |
372 | ||
373 | static unsigned int snd_compr_poll(struct file *f, poll_table *wait) | |
374 | { | |
375 | struct snd_compr_file *data = f->private_data; | |
376 | struct snd_compr_stream *stream; | |
377 | size_t avail; | |
378 | int retval = 0; | |
379 | ||
380 | if (snd_BUG_ON(!data)) | |
381 | return -EFAULT; | |
382 | stream = &data->stream; | |
383 | if (snd_BUG_ON(!stream)) | |
384 | return -EFAULT; | |
385 | ||
386 | mutex_lock(&stream->device->lock); | |
c15b149a | 387 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { |
b21c60a4 VK |
388 | retval = -EBADFD; |
389 | goto out; | |
390 | } | |
391 | poll_wait(f, &stream->runtime->sleep, wait); | |
392 | ||
393 | avail = snd_compr_get_avail(stream); | |
394 | pr_debug("avail is %ld\n", (unsigned long)avail); | |
395 | /* check if we have at least one fragment to fill */ | |
396 | switch (stream->runtime->state) { | |
397 | case SNDRV_PCM_STATE_DRAINING: | |
398 | /* stream has been woken up after drain is complete | |
399 | * draining done so set stream state to stopped | |
400 | */ | |
401 | retval = snd_compr_get_poll(stream); | |
402 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
403 | break; | |
404 | case SNDRV_PCM_STATE_RUNNING: | |
405 | case SNDRV_PCM_STATE_PREPARED: | |
406 | case SNDRV_PCM_STATE_PAUSED: | |
407 | if (avail >= stream->runtime->fragment_size) | |
408 | retval = snd_compr_get_poll(stream); | |
409 | break; | |
410 | default: | |
411 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
412 | retval = POLLOUT | POLLWRNORM | POLLERR; | |
413 | else | |
414 | retval = POLLIN | POLLRDNORM | POLLERR; | |
415 | break; | |
416 | } | |
417 | out: | |
418 | mutex_unlock(&stream->device->lock); | |
419 | return retval; | |
420 | } | |
421 | ||
422 | static int | |
423 | snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg) | |
424 | { | |
425 | int retval; | |
426 | struct snd_compr_caps caps; | |
427 | ||
428 | if (!stream->ops->get_caps) | |
429 | return -ENXIO; | |
430 | ||
1c62e9f2 | 431 | memset(&caps, 0, sizeof(caps)); |
b21c60a4 VK |
432 | retval = stream->ops->get_caps(stream, &caps); |
433 | if (retval) | |
434 | goto out; | |
435 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) | |
436 | retval = -EFAULT; | |
437 | out: | |
438 | return retval; | |
439 | } | |
440 | ||
441 | static int | |
442 | snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg) | |
443 | { | |
444 | int retval; | |
445 | struct snd_compr_codec_caps *caps; | |
446 | ||
447 | if (!stream->ops->get_codec_caps) | |
448 | return -ENXIO; | |
449 | ||
47966e97 | 450 | caps = kzalloc(sizeof(*caps), GFP_KERNEL); |
b21c60a4 VK |
451 | if (!caps) |
452 | return -ENOMEM; | |
453 | ||
454 | retval = stream->ops->get_codec_caps(stream, caps); | |
455 | if (retval) | |
456 | goto out; | |
457 | if (copy_to_user((void __user *)arg, caps, sizeof(*caps))) | |
458 | retval = -EFAULT; | |
459 | ||
460 | out: | |
461 | kfree(caps); | |
462 | return retval; | |
463 | } | |
464 | ||
465 | /* revisit this with snd_pcm_preallocate_xxx */ | |
466 | static int snd_compr_allocate_buffer(struct snd_compr_stream *stream, | |
467 | struct snd_compr_params *params) | |
468 | { | |
469 | unsigned int buffer_size; | |
470 | void *buffer; | |
471 | ||
472 | buffer_size = params->buffer.fragment_size * params->buffer.fragments; | |
473 | if (stream->ops->copy) { | |
474 | buffer = NULL; | |
475 | /* if copy is defined the driver will be required to copy | |
476 | * the data from core | |
477 | */ | |
478 | } else { | |
479 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
480 | if (!buffer) | |
481 | return -ENOMEM; | |
482 | } | |
483 | stream->runtime->fragment_size = params->buffer.fragment_size; | |
484 | stream->runtime->fragments = params->buffer.fragments; | |
485 | stream->runtime->buffer = buffer; | |
486 | stream->runtime->buffer_size = buffer_size; | |
487 | return 0; | |
488 | } | |
489 | ||
4dc040a0 VK |
490 | static int snd_compress_check_input(struct snd_compr_params *params) |
491 | { | |
492 | /* first let's check the buffer parameter's */ | |
493 | if (params->buffer.fragment_size == 0 || | |
6217e5ed | 494 | params->buffer.fragments > INT_MAX / params->buffer.fragment_size) |
4dc040a0 VK |
495 | return -EINVAL; |
496 | ||
fb4a9779 VK |
497 | /* now codec parameters */ |
498 | if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX) | |
499 | return -EINVAL; | |
500 | ||
501 | if (params->codec.ch_in == 0 || params->codec.ch_out == 0) | |
502 | return -EINVAL; | |
fb4a9779 | 503 | |
4dc040a0 VK |
504 | return 0; |
505 | } | |
506 | ||
b21c60a4 VK |
507 | static int |
508 | snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) | |
509 | { | |
510 | struct snd_compr_params *params; | |
511 | int retval; | |
512 | ||
513 | if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { | |
514 | /* | |
515 | * we should allow parameter change only when stream has been | |
516 | * opened not in other cases | |
517 | */ | |
518 | params = kmalloc(sizeof(*params), GFP_KERNEL); | |
519 | if (!params) | |
520 | return -ENOMEM; | |
769fab2a JJ |
521 | if (copy_from_user(params, (void __user *)arg, sizeof(*params))) { |
522 | retval = -EFAULT; | |
523 | goto out; | |
524 | } | |
4dc040a0 VK |
525 | |
526 | retval = snd_compress_check_input(params); | |
527 | if (retval) | |
528 | goto out; | |
529 | ||
b21c60a4 VK |
530 | retval = snd_compr_allocate_buffer(stream, params); |
531 | if (retval) { | |
769fab2a JJ |
532 | retval = -ENOMEM; |
533 | goto out; | |
b21c60a4 | 534 | } |
4dc040a0 | 535 | |
b21c60a4 VK |
536 | retval = stream->ops->set_params(stream, params); |
537 | if (retval) | |
538 | goto out; | |
49bb6402 | 539 | |
9727b490 JK |
540 | stream->metadata_set = false; |
541 | stream->next_track = false; | |
49bb6402 CK |
542 | |
543 | if (stream->direction == SND_COMPRESS_PLAYBACK) | |
544 | stream->runtime->state = SNDRV_PCM_STATE_SETUP; | |
545 | else | |
546 | stream->runtime->state = SNDRV_PCM_STATE_PREPARED; | |
769fab2a | 547 | } else { |
b21c60a4 | 548 | return -EPERM; |
769fab2a | 549 | } |
b21c60a4 VK |
550 | out: |
551 | kfree(params); | |
552 | return retval; | |
553 | } | |
554 | ||
555 | static int | |
556 | snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg) | |
557 | { | |
558 | struct snd_codec *params; | |
559 | int retval; | |
560 | ||
561 | if (!stream->ops->get_params) | |
562 | return -EBADFD; | |
563 | ||
47966e97 | 564 | params = kzalloc(sizeof(*params), GFP_KERNEL); |
b21c60a4 VK |
565 | if (!params) |
566 | return -ENOMEM; | |
567 | retval = stream->ops->get_params(stream, params); | |
568 | if (retval) | |
569 | goto out; | |
570 | if (copy_to_user((char __user *)arg, params, sizeof(*params))) | |
571 | retval = -EFAULT; | |
572 | ||
573 | out: | |
574 | kfree(params); | |
575 | return retval; | |
576 | } | |
577 | ||
9727b490 JK |
578 | static int |
579 | snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
580 | { | |
581 | struct snd_compr_metadata metadata; | |
582 | int retval; | |
583 | ||
584 | if (!stream->ops->get_metadata) | |
585 | return -ENXIO; | |
586 | ||
587 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
588 | return -EFAULT; | |
589 | ||
590 | retval = stream->ops->get_metadata(stream, &metadata); | |
591 | if (retval != 0) | |
592 | return retval; | |
593 | ||
594 | if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata))) | |
595 | return -EFAULT; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | static int | |
601 | snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg) | |
602 | { | |
603 | struct snd_compr_metadata metadata; | |
604 | int retval; | |
605 | ||
606 | if (!stream->ops->set_metadata) | |
607 | return -ENXIO; | |
608 | /* | |
609 | * we should allow parameter change only when stream has been | |
610 | * opened not in other cases | |
611 | */ | |
612 | if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata))) | |
613 | return -EFAULT; | |
614 | ||
615 | retval = stream->ops->set_metadata(stream, &metadata); | |
616 | stream->metadata_set = true; | |
617 | ||
618 | return retval; | |
619 | } | |
620 | ||
b21c60a4 VK |
621 | static inline int |
622 | snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg) | |
623 | { | |
17ac8e5c RF |
624 | struct snd_compr_tstamp tstamp = {0}; |
625 | int ret; | |
b21c60a4 | 626 | |
17ac8e5c RF |
627 | ret = snd_compr_update_tstamp(stream, &tstamp); |
628 | if (ret == 0) | |
629 | ret = copy_to_user((struct snd_compr_tstamp __user *)arg, | |
630 | &tstamp, sizeof(tstamp)) ? -EFAULT : 0; | |
631 | return ret; | |
b21c60a4 VK |
632 | } |
633 | ||
634 | static int snd_compr_pause(struct snd_compr_stream *stream) | |
635 | { | |
636 | int retval; | |
637 | ||
638 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
639 | return -EPERM; | |
640 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); | |
6b18f793 | 641 | if (!retval) |
b21c60a4 | 642 | stream->runtime->state = SNDRV_PCM_STATE_PAUSED; |
b21c60a4 VK |
643 | return retval; |
644 | } | |
645 | ||
646 | static int snd_compr_resume(struct snd_compr_stream *stream) | |
647 | { | |
648 | int retval; | |
649 | ||
650 | if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED) | |
651 | return -EPERM; | |
652 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); | |
653 | if (!retval) | |
654 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
655 | return retval; | |
656 | } | |
657 | ||
658 | static int snd_compr_start(struct snd_compr_stream *stream) | |
659 | { | |
660 | int retval; | |
661 | ||
662 | if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED) | |
663 | return -EPERM; | |
664 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START); | |
665 | if (!retval) | |
666 | stream->runtime->state = SNDRV_PCM_STATE_RUNNING; | |
667 | return retval; | |
668 | } | |
669 | ||
670 | static int snd_compr_stop(struct snd_compr_stream *stream) | |
671 | { | |
672 | int retval; | |
673 | ||
674 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
675 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
676 | return -EPERM; | |
677 | retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP); | |
678 | if (!retval) { | |
917f4b5c | 679 | snd_compr_drain_notify(stream); |
8b21460a VK |
680 | stream->runtime->total_bytes_available = 0; |
681 | stream->runtime->total_bytes_transferred = 0; | |
b21c60a4 VK |
682 | } |
683 | return retval; | |
684 | } | |
685 | ||
917f4b5c VK |
686 | static int snd_compress_wait_for_drain(struct snd_compr_stream *stream) |
687 | { | |
f44f2a54 VK |
688 | int ret; |
689 | ||
917f4b5c VK |
690 | /* |
691 | * We are called with lock held. So drop the lock while we wait for | |
692 | * drain complete notfication from the driver | |
693 | * | |
694 | * It is expected that driver will notify the drain completion and then | |
695 | * stream will be moved to SETUP state, even if draining resulted in an | |
696 | * error. We can trigger next track after this. | |
697 | */ | |
698 | stream->runtime->state = SNDRV_PCM_STATE_DRAINING; | |
699 | mutex_unlock(&stream->device->lock); | |
700 | ||
f44f2a54 VK |
701 | /* we wait for drain to complete here, drain can return when |
702 | * interruption occurred, wait returned error or success. | |
703 | * For the first two cases we don't do anything different here and | |
704 | * return after waking up | |
705 | */ | |
706 | ||
707 | ret = wait_event_interruptible(stream->runtime->sleep, | |
708 | (stream->runtime->state != SNDRV_PCM_STATE_DRAINING)); | |
709 | if (ret == -ERESTARTSYS) | |
710 | pr_debug("wait aborted by a signal"); | |
711 | else if (ret) | |
712 | pr_debug("wait for drain failed with %d\n", ret); | |
713 | ||
917f4b5c VK |
714 | |
715 | wake_up(&stream->runtime->sleep); | |
716 | mutex_lock(&stream->device->lock); | |
717 | ||
f44f2a54 | 718 | return ret; |
917f4b5c VK |
719 | } |
720 | ||
b21c60a4 VK |
721 | static int snd_compr_drain(struct snd_compr_stream *stream) |
722 | { | |
723 | int retval; | |
724 | ||
725 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
726 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
727 | return -EPERM; | |
917f4b5c | 728 | |
b21c60a4 | 729 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN); |
917f4b5c | 730 | if (retval) { |
f44f2a54 | 731 | pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval); |
b21c60a4 | 732 | wake_up(&stream->runtime->sleep); |
917f4b5c | 733 | return retval; |
b21c60a4 | 734 | } |
917f4b5c | 735 | |
f44f2a54 | 736 | return snd_compress_wait_for_drain(stream); |
b21c60a4 VK |
737 | } |
738 | ||
9727b490 JK |
739 | static int snd_compr_next_track(struct snd_compr_stream *stream) |
740 | { | |
741 | int retval; | |
742 | ||
743 | /* only a running stream can transition to next track */ | |
744 | if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) | |
745 | return -EPERM; | |
746 | ||
747 | /* you can signal next track isf this is intended to be a gapless stream | |
748 | * and current track metadata is set | |
749 | */ | |
750 | if (stream->metadata_set == false) | |
751 | return -EPERM; | |
752 | ||
753 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK); | |
754 | if (retval != 0) | |
755 | return retval; | |
756 | stream->metadata_set = false; | |
757 | stream->next_track = true; | |
758 | return 0; | |
759 | } | |
760 | ||
761 | static int snd_compr_partial_drain(struct snd_compr_stream *stream) | |
762 | { | |
763 | int retval; | |
764 | if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || | |
765 | stream->runtime->state == SNDRV_PCM_STATE_SETUP) | |
766 | return -EPERM; | |
767 | /* stream can be drained only when next track has been signalled */ | |
768 | if (stream->next_track == false) | |
769 | return -EPERM; | |
770 | ||
771 | retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN); | |
917f4b5c | 772 | if (retval) { |
f44f2a54 | 773 | pr_debug("Partial drain returned failure\n"); |
917f4b5c VK |
774 | wake_up(&stream->runtime->sleep); |
775 | return retval; | |
776 | } | |
9727b490 JK |
777 | |
778 | stream->next_track = false; | |
917f4b5c | 779 | return snd_compress_wait_for_drain(stream); |
9727b490 JK |
780 | } |
781 | ||
b21c60a4 VK |
782 | static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
783 | { | |
784 | struct snd_compr_file *data = f->private_data; | |
785 | struct snd_compr_stream *stream; | |
786 | int retval = -ENOTTY; | |
787 | ||
788 | if (snd_BUG_ON(!data)) | |
789 | return -EFAULT; | |
790 | stream = &data->stream; | |
791 | if (snd_BUG_ON(!stream)) | |
792 | return -EFAULT; | |
793 | mutex_lock(&stream->device->lock); | |
794 | switch (_IOC_NR(cmd)) { | |
795 | case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION): | |
a8d30608 | 796 | retval = put_user(SNDRV_COMPRESS_VERSION, |
b21c60a4 VK |
797 | (int __user *)arg) ? -EFAULT : 0; |
798 | break; | |
799 | case _IOC_NR(SNDRV_COMPRESS_GET_CAPS): | |
800 | retval = snd_compr_get_caps(stream, arg); | |
801 | break; | |
802 | case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS): | |
803 | retval = snd_compr_get_codec_caps(stream, arg); | |
804 | break; | |
805 | case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS): | |
806 | retval = snd_compr_set_params(stream, arg); | |
807 | break; | |
808 | case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS): | |
809 | retval = snd_compr_get_params(stream, arg); | |
810 | break; | |
9727b490 JK |
811 | case _IOC_NR(SNDRV_COMPRESS_SET_METADATA): |
812 | retval = snd_compr_set_metadata(stream, arg); | |
813 | break; | |
814 | case _IOC_NR(SNDRV_COMPRESS_GET_METADATA): | |
815 | retval = snd_compr_get_metadata(stream, arg); | |
816 | break; | |
b21c60a4 VK |
817 | case _IOC_NR(SNDRV_COMPRESS_TSTAMP): |
818 | retval = snd_compr_tstamp(stream, arg); | |
819 | break; | |
820 | case _IOC_NR(SNDRV_COMPRESS_AVAIL): | |
821 | retval = snd_compr_ioctl_avail(stream, arg); | |
822 | break; | |
823 | case _IOC_NR(SNDRV_COMPRESS_PAUSE): | |
824 | retval = snd_compr_pause(stream); | |
825 | break; | |
826 | case _IOC_NR(SNDRV_COMPRESS_RESUME): | |
827 | retval = snd_compr_resume(stream); | |
828 | break; | |
829 | case _IOC_NR(SNDRV_COMPRESS_START): | |
830 | retval = snd_compr_start(stream); | |
831 | break; | |
832 | case _IOC_NR(SNDRV_COMPRESS_STOP): | |
833 | retval = snd_compr_stop(stream); | |
834 | break; | |
835 | case _IOC_NR(SNDRV_COMPRESS_DRAIN): | |
836 | retval = snd_compr_drain(stream); | |
837 | break; | |
9727b490 JK |
838 | case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN): |
839 | retval = snd_compr_partial_drain(stream); | |
840 | break; | |
841 | case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK): | |
842 | retval = snd_compr_next_track(stream); | |
843 | break; | |
844 | ||
b21c60a4 VK |
845 | } |
846 | mutex_unlock(&stream->device->lock); | |
847 | return retval; | |
848 | } | |
849 | ||
850 | static const struct file_operations snd_compr_file_ops = { | |
851 | .owner = THIS_MODULE, | |
852 | .open = snd_compr_open, | |
853 | .release = snd_compr_free, | |
854 | .write = snd_compr_write, | |
855 | .read = snd_compr_read, | |
856 | .unlocked_ioctl = snd_compr_ioctl, | |
857 | .mmap = snd_compr_mmap, | |
858 | .poll = snd_compr_poll, | |
859 | }; | |
860 | ||
861 | static int snd_compress_dev_register(struct snd_device *device) | |
862 | { | |
863 | int ret = -EINVAL; | |
864 | char str[16]; | |
865 | struct snd_compr *compr; | |
866 | ||
867 | if (snd_BUG_ON(!device || !device->device_data)) | |
868 | return -EBADFD; | |
869 | compr = device->device_data; | |
870 | ||
871 | sprintf(str, "comprC%iD%i", compr->card->number, compr->device); | |
872 | pr_debug("reg %s for device %s, direction %d\n", str, compr->name, | |
873 | compr->direction); | |
874 | /* register compressed device */ | |
875 | ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card, | |
876 | compr->device, &snd_compr_file_ops, compr, str); | |
877 | if (ret < 0) { | |
878 | pr_err("snd_register_device failed\n %d", ret); | |
879 | return ret; | |
880 | } | |
881 | return ret; | |
882 | ||
883 | } | |
884 | ||
885 | static int snd_compress_dev_disconnect(struct snd_device *device) | |
886 | { | |
887 | struct snd_compr *compr; | |
888 | ||
889 | compr = device->device_data; | |
4028b6c4 LG |
890 | snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card, |
891 | compr->device); | |
b21c60a4 VK |
892 | return 0; |
893 | } | |
894 | ||
895 | /* | |
896 | * snd_compress_new: create new compress device | |
897 | * @card: sound card pointer | |
898 | * @device: device number | |
899 | * @dirn: device direction, should be of type enum snd_compr_direction | |
900 | * @compr: compress device pointer | |
901 | */ | |
902 | int snd_compress_new(struct snd_card *card, int device, | |
903 | int dirn, struct snd_compr *compr) | |
904 | { | |
905 | static struct snd_device_ops ops = { | |
906 | .dev_free = NULL, | |
907 | .dev_register = snd_compress_dev_register, | |
908 | .dev_disconnect = snd_compress_dev_disconnect, | |
909 | }; | |
910 | ||
911 | compr->card = card; | |
912 | compr->device = device; | |
913 | compr->direction = dirn; | |
914 | return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops); | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(snd_compress_new); | |
917 | ||
918 | static int snd_compress_add_device(struct snd_compr *device) | |
919 | { | |
920 | int ret; | |
921 | ||
922 | if (!device->card) | |
923 | return -EINVAL; | |
924 | ||
925 | /* register the card */ | |
926 | ret = snd_card_register(device->card); | |
927 | if (ret) | |
928 | goto out; | |
929 | return 0; | |
930 | ||
931 | out: | |
932 | pr_err("failed with %d\n", ret); | |
933 | return ret; | |
934 | ||
935 | } | |
936 | ||
937 | static int snd_compress_remove_device(struct snd_compr *device) | |
938 | { | |
939 | return snd_card_free(device->card); | |
940 | } | |
941 | ||
942 | /** | |
943 | * snd_compress_register - register compressed device | |
944 | * | |
945 | * @device: compressed device to register | |
946 | */ | |
947 | int snd_compress_register(struct snd_compr *device) | |
948 | { | |
949 | int retval; | |
950 | ||
951 | if (device->name == NULL || device->dev == NULL || device->ops == NULL) | |
952 | return -EINVAL; | |
953 | ||
954 | pr_debug("Registering compressed device %s\n", device->name); | |
955 | if (snd_BUG_ON(!device->ops->open)) | |
956 | return -EINVAL; | |
957 | if (snd_BUG_ON(!device->ops->free)) | |
958 | return -EINVAL; | |
959 | if (snd_BUG_ON(!device->ops->set_params)) | |
960 | return -EINVAL; | |
961 | if (snd_BUG_ON(!device->ops->trigger)) | |
962 | return -EINVAL; | |
963 | ||
964 | mutex_init(&device->lock); | |
965 | ||
966 | /* register a compressed card */ | |
967 | mutex_lock(&device_mutex); | |
968 | retval = snd_compress_add_device(device); | |
969 | mutex_unlock(&device_mutex); | |
970 | return retval; | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(snd_compress_register); | |
973 | ||
974 | int snd_compress_deregister(struct snd_compr *device) | |
975 | { | |
976 | pr_debug("Removing compressed device %s\n", device->name); | |
977 | mutex_lock(&device_mutex); | |
978 | snd_compress_remove_device(device); | |
979 | mutex_unlock(&device_mutex); | |
980 | return 0; | |
981 | } | |
982 | EXPORT_SYMBOL_GPL(snd_compress_deregister); | |
983 | ||
984 | static int __init snd_compress_init(void) | |
985 | { | |
986 | return 0; | |
987 | } | |
988 | ||
989 | static void __exit snd_compress_exit(void) | |
990 | { | |
991 | } | |
992 | ||
993 | module_init(snd_compress_init); | |
994 | module_exit(snd_compress_exit); | |
995 | ||
996 | MODULE_DESCRIPTION("ALSA Compressed offload framework"); | |
997 | MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>"); | |
998 | MODULE_LICENSE("GPL v2"); |