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1 | /* |
2 | * Digital Audio (PCM) abstract layer |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
4 | * |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | |
22 | #include <linux/init.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/module.h> |
25 | #include <linux/time.h> |
26 | #include <linux/mutex.h> |
27 | #include <linux/device.h> |
28 | #include <sound/core.h> |
29 | #include <sound/minors.h> |
30 | #include <sound/pcm.h> |
31 | #include <sound/control.h> |
32 | #include <sound/info.h> |
33 | |
34 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); |
35 | MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); |
36 | MODULE_LICENSE("GPL"); |
37 | |
38 | static LIST_HEAD(snd_pcm_devices); |
39 | static LIST_HEAD(snd_pcm_notify_list); |
40 | static DEFINE_MUTEX(register_mutex); |
41 | |
42 | static int snd_pcm_free(struct snd_pcm *pcm); |
43 | static int snd_pcm_dev_free(struct snd_device *device); |
44 | static int snd_pcm_dev_register(struct snd_device *device); |
45 | static int snd_pcm_dev_disconnect(struct snd_device *device); |
46 | |
47 | static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) |
48 | { |
49 | struct snd_pcm *pcm; |
50 | |
51 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
52 | if (pcm->card == card && pcm->device == device) |
53 | return pcm; |
54 | } |
55 | return NULL; |
56 | } |
57 | |
58 | static int snd_pcm_next(struct snd_card *card, int device) |
59 | { |
60 | struct snd_pcm *pcm; |
61 | |
62 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
63 | if (pcm->card == card && pcm->device > device) |
64 | return pcm->device; |
65 | else if (pcm->card->number > card->number) |
66 | return -1; |
67 | } |
68 | return -1; |
69 | } |
70 | |
71 | static int snd_pcm_add(struct snd_pcm *newpcm) |
72 | { |
73 | struct snd_pcm *pcm; |
74 | |
75 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
76 | if (pcm->card == newpcm->card && pcm->device == newpcm->device) |
77 | return -EBUSY; |
78 | if (pcm->card->number > newpcm->card->number || |
79 | (pcm->card == newpcm->card && |
80 | pcm->device > newpcm->device)) { |
81 | list_add(&newpcm->list, pcm->list.prev); |
82 | return 0; |
83 | } |
84 | } |
85 | list_add_tail(&newpcm->list, &snd_pcm_devices); |
86 | return 0; |
87 | } |
88 | |
89 | static int snd_pcm_control_ioctl(struct snd_card *card, |
90 | struct snd_ctl_file *control, |
91 | unsigned int cmd, unsigned long arg) |
92 | { |
93 | switch (cmd) { |
94 | case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: |
95 | { |
96 | int device; |
97 | |
98 | if (get_user(device, (int __user *)arg)) |
99 | return -EFAULT; |
100 | mutex_lock(®ister_mutex); |
101 | device = snd_pcm_next(card, device); |
102 | mutex_unlock(®ister_mutex); |
103 | if (put_user(device, (int __user *)arg)) |
104 | return -EFAULT; |
105 | return 0; |
106 | } |
107 | case SNDRV_CTL_IOCTL_PCM_INFO: |
108 | { |
109 | struct snd_pcm_info __user *info; |
110 | unsigned int device, subdevice; |
111 | int stream; |
112 | struct snd_pcm *pcm; |
113 | struct snd_pcm_str *pstr; |
114 | struct snd_pcm_substream *substream; |
115 | int err; |
116 | |
117 | info = (struct snd_pcm_info __user *)arg; |
118 | if (get_user(device, &info->device)) |
119 | return -EFAULT; |
120 | if (get_user(stream, &info->stream)) |
121 | return -EFAULT; |
122 | if (stream < 0 || stream > 1) |
123 | return -EINVAL; |
124 | if (get_user(subdevice, &info->subdevice)) |
125 | return -EFAULT; |
126 | mutex_lock(®ister_mutex); |
127 | pcm = snd_pcm_get(card, device); |
128 | if (pcm == NULL) { |
129 | err = -ENXIO; |
130 | goto _error; |
131 | } |
132 | pstr = &pcm->streams[stream]; |
133 | if (pstr->substream_count == 0) { |
134 | err = -ENOENT; |
135 | goto _error; |
136 | } |
137 | if (subdevice >= pstr->substream_count) { |
138 | err = -ENXIO; |
139 | goto _error; |
140 | } |
141 | for (substream = pstr->substream; substream; |
142 | substream = substream->next) |
143 | if (substream->number == (int)subdevice) |
144 | break; |
145 | if (substream == NULL) { |
146 | err = -ENXIO; |
147 | goto _error; |
148 | } |
149 | err = snd_pcm_info_user(substream, info); |
150 | _error: |
151 | mutex_unlock(®ister_mutex); |
152 | return err; |
153 | } |
154 | case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: |
155 | { |
156 | int val; |
157 | |
158 | if (get_user(val, (int __user *)arg)) |
159 | return -EFAULT; |
160 | control->prefer_pcm_subdevice = val; |
161 | return 0; |
162 | } |
163 | } |
164 | return -ENOIOCTLCMD; |
165 | } |
166 | |
167 | #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v |
168 | |
169 | static char *snd_pcm_format_names[] = { |
170 | FORMAT(S8), |
171 | FORMAT(U8), |
172 | FORMAT(S16_LE), |
173 | FORMAT(S16_BE), |
174 | FORMAT(U16_LE), |
175 | FORMAT(U16_BE), |
176 | FORMAT(S24_LE), |
177 | FORMAT(S24_BE), |
178 | FORMAT(U24_LE), |
179 | FORMAT(U24_BE), |
180 | FORMAT(S32_LE), |
181 | FORMAT(S32_BE), |
182 | FORMAT(U32_LE), |
183 | FORMAT(U32_BE), |
184 | FORMAT(FLOAT_LE), |
185 | FORMAT(FLOAT_BE), |
186 | FORMAT(FLOAT64_LE), |
187 | FORMAT(FLOAT64_BE), |
188 | FORMAT(IEC958_SUBFRAME_LE), |
189 | FORMAT(IEC958_SUBFRAME_BE), |
190 | FORMAT(MU_LAW), |
191 | FORMAT(A_LAW), |
192 | FORMAT(IMA_ADPCM), |
193 | FORMAT(MPEG), |
194 | FORMAT(GSM), |
195 | FORMAT(SPECIAL), |
196 | FORMAT(S24_3LE), |
197 | FORMAT(S24_3BE), |
198 | FORMAT(U24_3LE), |
199 | FORMAT(U24_3BE), |
200 | FORMAT(S20_3LE), |
201 | FORMAT(S20_3BE), |
202 | FORMAT(U20_3LE), |
203 | FORMAT(U20_3BE), |
204 | FORMAT(S18_3LE), |
205 | FORMAT(S18_3BE), |
206 | FORMAT(U18_3LE), |
207 | FORMAT(U18_3BE), |
208 | FORMAT(G723_24), |
209 | FORMAT(G723_24_1B), |
210 | FORMAT(G723_40), |
211 | FORMAT(G723_40_1B), |
212 | }; |
213 | |
214 | const char *snd_pcm_format_name(snd_pcm_format_t format) |
215 | { |
216 | if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) |
217 | return "Unknown"; |
218 | return snd_pcm_format_names[(__force unsigned int)format]; |
219 | } |
220 | EXPORT_SYMBOL_GPL(snd_pcm_format_name); |
221 | |
222 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
223 | |
224 | #define STATE(v) [SNDRV_PCM_STATE_##v] = #v |
225 | #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v |
226 | #define READY(v) [SNDRV_PCM_READY_##v] = #v |
227 | #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v |
228 | #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v |
229 | #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v |
230 | #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v |
231 | #define START(v) [SNDRV_PCM_START_##v] = #v |
232 | #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v |
233 | |
234 | static char *snd_pcm_stream_names[] = { |
235 | STREAM(PLAYBACK), |
236 | STREAM(CAPTURE), |
237 | }; |
238 | |
239 | static char *snd_pcm_state_names[] = { |
240 | STATE(OPEN), |
241 | STATE(SETUP), |
242 | STATE(PREPARED), |
243 | STATE(RUNNING), |
244 | STATE(XRUN), |
245 | STATE(DRAINING), |
246 | STATE(PAUSED), |
247 | STATE(SUSPENDED), |
248 | }; |
249 | |
250 | static char *snd_pcm_access_names[] = { |
251 | ACCESS(MMAP_INTERLEAVED), |
252 | ACCESS(MMAP_NONINTERLEAVED), |
253 | ACCESS(MMAP_COMPLEX), |
254 | ACCESS(RW_INTERLEAVED), |
255 | ACCESS(RW_NONINTERLEAVED), |
256 | }; |
257 | |
258 | static char *snd_pcm_subformat_names[] = { |
259 | SUBFORMAT(STD), |
260 | }; |
261 | |
262 | static char *snd_pcm_tstamp_mode_names[] = { |
263 | TSTAMP(NONE), |
264 | TSTAMP(ENABLE), |
265 | }; |
266 | |
267 | static const char *snd_pcm_stream_name(int stream) |
268 | { |
269 | return snd_pcm_stream_names[stream]; |
270 | } |
271 | |
272 | static const char *snd_pcm_access_name(snd_pcm_access_t access) |
273 | { |
274 | return snd_pcm_access_names[(__force int)access]; |
275 | } |
276 | |
277 | static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) |
278 | { |
279 | return snd_pcm_subformat_names[(__force int)subformat]; |
280 | } |
281 | |
282 | static const char *snd_pcm_tstamp_mode_name(int mode) |
283 | { |
284 | return snd_pcm_tstamp_mode_names[mode]; |
285 | } |
286 | |
287 | static const char *snd_pcm_state_name(snd_pcm_state_t state) |
288 | { |
289 | return snd_pcm_state_names[(__force int)state]; |
290 | } |
291 | |
292 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
293 | #include <linux/soundcard.h> |
294 | |
295 | static const char *snd_pcm_oss_format_name(int format) |
296 | { |
297 | switch (format) { |
298 | case AFMT_MU_LAW: |
299 | return "MU_LAW"; |
300 | case AFMT_A_LAW: |
301 | return "A_LAW"; |
302 | case AFMT_IMA_ADPCM: |
303 | return "IMA_ADPCM"; |
304 | case AFMT_U8: |
305 | return "U8"; |
306 | case AFMT_S16_LE: |
307 | return "S16_LE"; |
308 | case AFMT_S16_BE: |
309 | return "S16_BE"; |
310 | case AFMT_S8: |
311 | return "S8"; |
312 | case AFMT_U16_LE: |
313 | return "U16_LE"; |
314 | case AFMT_U16_BE: |
315 | return "U16_BE"; |
316 | case AFMT_MPEG: |
317 | return "MPEG"; |
318 | default: |
319 | return "unknown"; |
320 | } |
321 | } |
322 | #endif |
323 | |
324 | static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, |
325 | struct snd_info_buffer *buffer) |
326 | { |
327 | struct snd_pcm_info *info; |
328 | int err; |
329 | |
330 | if (! substream) |
331 | return; |
332 | |
333 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
334 | if (! info) { |
335 | printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); |
336 | return; |
337 | } |
338 | |
339 | err = snd_pcm_info(substream, info); |
340 | if (err < 0) { |
341 | snd_iprintf(buffer, "error %d\n", err); |
342 | kfree(info); |
343 | return; |
344 | } |
345 | snd_iprintf(buffer, "card: %d\n", info->card); |
346 | snd_iprintf(buffer, "device: %d\n", info->device); |
347 | snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); |
348 | snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); |
349 | snd_iprintf(buffer, "id: %s\n", info->id); |
350 | snd_iprintf(buffer, "name: %s\n", info->name); |
351 | snd_iprintf(buffer, "subname: %s\n", info->subname); |
352 | snd_iprintf(buffer, "class: %d\n", info->dev_class); |
353 | snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); |
354 | snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); |
355 | snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); |
356 | kfree(info); |
357 | } |
358 | |
359 | static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, |
360 | struct snd_info_buffer *buffer) |
361 | { |
362 | snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, |
363 | buffer); |
364 | } |
365 | |
366 | static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, |
367 | struct snd_info_buffer *buffer) |
368 | { |
369 | snd_pcm_proc_info_read(entry->private_data, buffer); |
370 | } |
371 | |
372 | static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, |
373 | struct snd_info_buffer *buffer) |
374 | { |
375 | struct snd_pcm_substream *substream = entry->private_data; |
376 | struct snd_pcm_runtime *runtime; |
377 | |
378 | mutex_lock(&substream->pcm->open_mutex); |
379 | runtime = substream->runtime; |
380 | if (!runtime) { |
381 | snd_iprintf(buffer, "closed\n"); |
382 | goto unlock; |
383 | } |
384 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
385 | snd_iprintf(buffer, "no setup\n"); |
386 | goto unlock; |
387 | } |
388 | snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); |
389 | snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); |
390 | snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); |
391 | snd_iprintf(buffer, "channels: %u\n", runtime->channels); |
392 | snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); |
393 | snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); |
394 | snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); |
395 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
396 | if (substream->oss.oss) { |
397 | snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); |
398 | snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); |
399 | snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); |
400 | snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); |
401 | snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); |
402 | snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); |
403 | } |
404 | #endif |
405 | unlock: |
406 | mutex_unlock(&substream->pcm->open_mutex); |
407 | } |
408 | |
409 | static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, |
410 | struct snd_info_buffer *buffer) |
411 | { |
412 | struct snd_pcm_substream *substream = entry->private_data; |
413 | struct snd_pcm_runtime *runtime; |
414 | |
415 | mutex_lock(&substream->pcm->open_mutex); |
416 | runtime = substream->runtime; |
417 | if (!runtime) { |
418 | snd_iprintf(buffer, "closed\n"); |
419 | goto unlock; |
420 | } |
421 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
422 | snd_iprintf(buffer, "no setup\n"); |
423 | goto unlock; |
424 | } |
425 | snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); |
426 | snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); |
427 | snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); |
428 | snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); |
429 | snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); |
430 | snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); |
431 | snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); |
432 | snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); |
433 | unlock: |
434 | mutex_unlock(&substream->pcm->open_mutex); |
435 | } |
436 | |
437 | static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, |
438 | struct snd_info_buffer *buffer) |
439 | { |
440 | struct snd_pcm_substream *substream = entry->private_data; |
441 | struct snd_pcm_runtime *runtime; |
442 | struct snd_pcm_status status; |
443 | int err; |
444 | |
445 | mutex_lock(&substream->pcm->open_mutex); |
446 | runtime = substream->runtime; |
447 | if (!runtime) { |
448 | snd_iprintf(buffer, "closed\n"); |
449 | goto unlock; |
450 | } |
451 | memset(&status, 0, sizeof(status)); |
452 | err = snd_pcm_status(substream, &status); |
453 | if (err < 0) { |
454 | snd_iprintf(buffer, "error %d\n", err); |
455 | goto unlock; |
456 | } |
457 | snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); |
458 | snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); |
459 | snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", |
460 | status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); |
461 | snd_iprintf(buffer, "tstamp : %ld.%09ld\n", |
462 | status.tstamp.tv_sec, status.tstamp.tv_nsec); |
463 | snd_iprintf(buffer, "delay : %ld\n", status.delay); |
464 | snd_iprintf(buffer, "avail : %ld\n", status.avail); |
465 | snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); |
466 | snd_iprintf(buffer, "-----\n"); |
467 | snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); |
468 | snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); |
469 | unlock: |
470 | mutex_unlock(&substream->pcm->open_mutex); |
471 | } |
472 | |
473 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
474 | static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, |
475 | struct snd_info_buffer *buffer) |
476 | { |
477 | struct snd_pcm_str *pstr = entry->private_data; |
478 | snd_iprintf(buffer, "%d\n", pstr->xrun_debug); |
479 | } |
480 | |
481 | static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, |
482 | struct snd_info_buffer *buffer) |
483 | { |
484 | struct snd_pcm_str *pstr = entry->private_data; |
485 | char line[64]; |
486 | if (!snd_info_get_line(buffer, line, sizeof(line))) |
487 | pstr->xrun_debug = simple_strtoul(line, NULL, 10); |
488 | } |
489 | #endif |
490 | |
491 | static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) |
492 | { |
493 | struct snd_pcm *pcm = pstr->pcm; |
494 | struct snd_info_entry *entry; |
495 | char name[16]; |
496 | |
497 | sprintf(name, "pcm%i%c", pcm->device, |
498 | pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
499 | if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) |
500 | return -ENOMEM; |
501 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
502 | if (snd_info_register(entry) < 0) { |
503 | snd_info_free_entry(entry); |
504 | return -ENOMEM; |
505 | } |
506 | pstr->proc_root = entry; |
507 | |
508 | if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { |
509 | snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); |
510 | if (snd_info_register(entry) < 0) { |
511 | snd_info_free_entry(entry); |
512 | entry = NULL; |
513 | } |
514 | } |
515 | pstr->proc_info_entry = entry; |
516 | |
517 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
518 | if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", |
519 | pstr->proc_root)) != NULL) { |
520 | entry->c.text.read = snd_pcm_xrun_debug_read; |
521 | entry->c.text.write = snd_pcm_xrun_debug_write; |
522 | entry->mode |= S_IWUSR; |
523 | entry->private_data = pstr; |
524 | if (snd_info_register(entry) < 0) { |
525 | snd_info_free_entry(entry); |
526 | entry = NULL; |
527 | } |
528 | } |
529 | pstr->proc_xrun_debug_entry = entry; |
530 | #endif |
531 | return 0; |
532 | } |
533 | |
534 | static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) |
535 | { |
536 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
537 | snd_info_free_entry(pstr->proc_xrun_debug_entry); |
538 | pstr->proc_xrun_debug_entry = NULL; |
539 | #endif |
540 | snd_info_free_entry(pstr->proc_info_entry); |
541 | pstr->proc_info_entry = NULL; |
542 | snd_info_free_entry(pstr->proc_root); |
543 | pstr->proc_root = NULL; |
544 | return 0; |
545 | } |
546 | |
547 | static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) |
548 | { |
549 | struct snd_info_entry *entry; |
550 | struct snd_card *card; |
551 | char name[16]; |
552 | |
553 | card = substream->pcm->card; |
554 | |
555 | sprintf(name, "sub%i", substream->number); |
556 | if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) |
557 | return -ENOMEM; |
558 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
559 | if (snd_info_register(entry) < 0) { |
560 | snd_info_free_entry(entry); |
561 | return -ENOMEM; |
562 | } |
563 | substream->proc_root = entry; |
564 | |
565 | if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { |
566 | snd_info_set_text_ops(entry, substream, |
567 | snd_pcm_substream_proc_info_read); |
568 | if (snd_info_register(entry) < 0) { |
569 | snd_info_free_entry(entry); |
570 | entry = NULL; |
571 | } |
572 | } |
573 | substream->proc_info_entry = entry; |
574 | |
575 | if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { |
576 | snd_info_set_text_ops(entry, substream, |
577 | snd_pcm_substream_proc_hw_params_read); |
578 | if (snd_info_register(entry) < 0) { |
579 | snd_info_free_entry(entry); |
580 | entry = NULL; |
581 | } |
582 | } |
583 | substream->proc_hw_params_entry = entry; |
584 | |
585 | if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { |
586 | snd_info_set_text_ops(entry, substream, |
587 | snd_pcm_substream_proc_sw_params_read); |
588 | if (snd_info_register(entry) < 0) { |
589 | snd_info_free_entry(entry); |
590 | entry = NULL; |
591 | } |
592 | } |
593 | substream->proc_sw_params_entry = entry; |
594 | |
595 | if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { |
596 | snd_info_set_text_ops(entry, substream, |
597 | snd_pcm_substream_proc_status_read); |
598 | if (snd_info_register(entry) < 0) { |
599 | snd_info_free_entry(entry); |
600 | entry = NULL; |
601 | } |
602 | } |
603 | substream->proc_status_entry = entry; |
604 | |
605 | return 0; |
606 | } |
607 | |
608 | static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) |
609 | { |
610 | snd_info_free_entry(substream->proc_info_entry); |
611 | substream->proc_info_entry = NULL; |
612 | snd_info_free_entry(substream->proc_hw_params_entry); |
613 | substream->proc_hw_params_entry = NULL; |
614 | snd_info_free_entry(substream->proc_sw_params_entry); |
615 | substream->proc_sw_params_entry = NULL; |
616 | snd_info_free_entry(substream->proc_status_entry); |
617 | substream->proc_status_entry = NULL; |
618 | snd_info_free_entry(substream->proc_root); |
619 | substream->proc_root = NULL; |
620 | return 0; |
621 | } |
622 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
623 | static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } |
624 | static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } |
625 | static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } |
626 | static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } |
627 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
628 | |
629 | /** |
630 | * snd_pcm_new_stream - create a new PCM stream |
631 | * @pcm: the pcm instance |
632 | * @stream: the stream direction, SNDRV_PCM_STREAM_XXX |
633 | * @substream_count: the number of substreams |
634 | * |
635 | * Creates a new stream for the pcm. |
636 | * The corresponding stream on the pcm must have been empty before |
637 | * calling this, i.e. zero must be given to the argument of |
638 | * snd_pcm_new(). |
639 | * |
640 | * Returns zero if successful, or a negative error code on failure. |
641 | */ |
642 | int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) |
643 | { |
644 | int idx, err; |
645 | struct snd_pcm_str *pstr = &pcm->streams[stream]; |
646 | struct snd_pcm_substream *substream, *prev; |
647 | |
648 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
649 | mutex_init(&pstr->oss.setup_mutex); |
650 | #endif |
651 | pstr->stream = stream; |
652 | pstr->pcm = pcm; |
653 | pstr->substream_count = substream_count; |
654 | if (substream_count > 0 && !pcm->internal) { |
655 | err = snd_pcm_stream_proc_init(pstr); |
656 | if (err < 0) { |
657 | snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); |
658 | return err; |
659 | } |
660 | } |
661 | prev = NULL; |
662 | for (idx = 0, prev = NULL; idx < substream_count; idx++) { |
663 | substream = kzalloc(sizeof(*substream), GFP_KERNEL); |
664 | if (substream == NULL) { |
665 | snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); |
666 | return -ENOMEM; |
667 | } |
668 | substream->pcm = pcm; |
669 | substream->pstr = pstr; |
670 | substream->number = idx; |
671 | substream->stream = stream; |
672 | sprintf(substream->name, "subdevice #%i", idx); |
673 | substream->buffer_bytes_max = UINT_MAX; |
674 | if (prev == NULL) |
675 | pstr->substream = substream; |
676 | else |
677 | prev->next = substream; |
678 | |
679 | if (!pcm->internal) { |
680 | err = snd_pcm_substream_proc_init(substream); |
681 | if (err < 0) { |
682 | snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); |
683 | if (prev == NULL) |
684 | pstr->substream = NULL; |
685 | else |
686 | prev->next = NULL; |
687 | kfree(substream); |
688 | return err; |
689 | } |
690 | } |
691 | substream->group = &substream->self_group; |
692 | spin_lock_init(&substream->self_group.lock); |
693 | INIT_LIST_HEAD(&substream->self_group.substreams); |
694 | list_add_tail(&substream->link_list, &substream->self_group.substreams); |
695 | atomic_set(&substream->mmap_count, 0); |
696 | prev = substream; |
697 | } |
698 | return 0; |
699 | } |
700 | |
701 | EXPORT_SYMBOL(snd_pcm_new_stream); |
702 | |
703 | static int _snd_pcm_new(struct snd_card *card, const char *id, int device, |
704 | int playback_count, int capture_count, bool internal, |
705 | struct snd_pcm **rpcm) |
706 | { |
707 | struct snd_pcm *pcm; |
708 | int err; |
709 | static struct snd_device_ops ops = { |
710 | .dev_free = snd_pcm_dev_free, |
711 | .dev_register = snd_pcm_dev_register, |
712 | .dev_disconnect = snd_pcm_dev_disconnect, |
713 | }; |
714 | |
715 | if (snd_BUG_ON(!card)) |
716 | return -ENXIO; |
717 | if (rpcm) |
718 | *rpcm = NULL; |
719 | pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
720 | if (pcm == NULL) { |
721 | snd_printk(KERN_ERR "Cannot allocate PCM\n"); |
722 | return -ENOMEM; |
723 | } |
724 | pcm->card = card; |
725 | pcm->device = device; |
726 | pcm->internal = internal; |
727 | if (id) |
728 | strlcpy(pcm->id, id, sizeof(pcm->id)); |
729 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { |
730 | snd_pcm_free(pcm); |
731 | return err; |
732 | } |
733 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { |
734 | snd_pcm_free(pcm); |
735 | return err; |
736 | } |
737 | mutex_init(&pcm->open_mutex); |
738 | init_waitqueue_head(&pcm->open_wait); |
739 | if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { |
740 | snd_pcm_free(pcm); |
741 | return err; |
742 | } |
743 | if (rpcm) |
744 | *rpcm = pcm; |
745 | return 0; |
746 | } |
747 | |
748 | /** |
749 | * snd_pcm_new - create a new PCM instance |
750 | * @card: the card instance |
751 | * @id: the id string |
752 | * @device: the device index (zero based) |
753 | * @playback_count: the number of substreams for playback |
754 | * @capture_count: the number of substreams for capture |
755 | * @rpcm: the pointer to store the new pcm instance |
756 | * |
757 | * Creates a new PCM instance. |
758 | * |
759 | * The pcm operators have to be set afterwards to the new instance |
760 | * via snd_pcm_set_ops(). |
761 | * |
762 | * Returns zero if successful, or a negative error code on failure. |
763 | */ |
764 | int snd_pcm_new(struct snd_card *card, const char *id, int device, |
765 | int playback_count, int capture_count, struct snd_pcm **rpcm) |
766 | { |
767 | return _snd_pcm_new(card, id, device, playback_count, capture_count, |
768 | false, rpcm); |
769 | } |
770 | EXPORT_SYMBOL(snd_pcm_new); |
771 | |
772 | /** |
773 | * snd_pcm_new_internal - create a new internal PCM instance |
774 | * @card: the card instance |
775 | * @id: the id string |
776 | * @device: the device index (zero based - shared with normal PCMs) |
777 | * @playback_count: the number of substreams for playback |
778 | * @capture_count: the number of substreams for capture |
779 | * @rpcm: the pointer to store the new pcm instance |
780 | * |
781 | * Creates a new internal PCM instance with no userspace device or procfs |
782 | * entries. This is used by ASoC Back End PCMs in order to create a PCM that |
783 | * will only be used internally by kernel drivers. i.e. it cannot be opened |
784 | * by userspace. It provides existing ASoC components drivers with a substream |
785 | * and access to any private data. |
786 | * |
787 | * The pcm operators have to be set afterwards to the new instance |
788 | * via snd_pcm_set_ops(). |
789 | * |
790 | * Returns zero if successful, or a negative error code on failure. |
791 | */ |
792 | int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, |
793 | int playback_count, int capture_count, |
794 | struct snd_pcm **rpcm) |
795 | { |
796 | return _snd_pcm_new(card, id, device, playback_count, capture_count, |
797 | true, rpcm); |
798 | } |
799 | EXPORT_SYMBOL(snd_pcm_new_internal); |
800 | |
801 | static void snd_pcm_free_stream(struct snd_pcm_str * pstr) |
802 | { |
803 | struct snd_pcm_substream *substream, *substream_next; |
804 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
805 | struct snd_pcm_oss_setup *setup, *setupn; |
806 | #endif |
807 | substream = pstr->substream; |
808 | while (substream) { |
809 | substream_next = substream->next; |
810 | snd_pcm_timer_done(substream); |
811 | snd_pcm_substream_proc_done(substream); |
812 | kfree(substream); |
813 | substream = substream_next; |
814 | } |
815 | snd_pcm_stream_proc_done(pstr); |
816 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
817 | for (setup = pstr->oss.setup_list; setup; setup = setupn) { |
818 | setupn = setup->next; |
819 | kfree(setup->task_name); |
820 | kfree(setup); |
821 | } |
822 | #endif |
823 | } |
824 | |
825 | static int snd_pcm_free(struct snd_pcm *pcm) |
826 | { |
827 | struct snd_pcm_notify *notify; |
828 | |
829 | if (!pcm) |
830 | return 0; |
831 | list_for_each_entry(notify, &snd_pcm_notify_list, list) { |
832 | notify->n_unregister(pcm); |
833 | } |
834 | if (pcm->private_free) |
835 | pcm->private_free(pcm); |
836 | snd_pcm_lib_preallocate_free_for_all(pcm); |
837 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); |
838 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); |
839 | kfree(pcm); |
840 | return 0; |
841 | } |
842 | |
843 | static int snd_pcm_dev_free(struct snd_device *device) |
844 | { |
845 | struct snd_pcm *pcm = device->device_data; |
846 | return snd_pcm_free(pcm); |
847 | } |
848 | |
849 | int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, |
850 | struct file *file, |
851 | struct snd_pcm_substream **rsubstream) |
852 | { |
853 | struct snd_pcm_str * pstr; |
854 | struct snd_pcm_substream *substream; |
855 | struct snd_pcm_runtime *runtime; |
856 | struct snd_ctl_file *kctl; |
857 | struct snd_card *card; |
858 | int prefer_subdevice = -1; |
859 | size_t size; |
860 | |
861 | if (snd_BUG_ON(!pcm || !rsubstream)) |
862 | return -ENXIO; |
863 | *rsubstream = NULL; |
864 | pstr = &pcm->streams[stream]; |
865 | if (pstr->substream == NULL || pstr->substream_count == 0) |
866 | return -ENODEV; |
867 | |
868 | card = pcm->card; |
869 | read_lock(&card->ctl_files_rwlock); |
870 | list_for_each_entry(kctl, &card->ctl_files, list) { |
871 | if (kctl->pid == task_pid(current)) { |
872 | prefer_subdevice = kctl->prefer_pcm_subdevice; |
873 | if (prefer_subdevice != -1) |
874 | break; |
875 | } |
876 | } |
877 | read_unlock(&card->ctl_files_rwlock); |
878 | |
879 | switch (stream) { |
880 | case SNDRV_PCM_STREAM_PLAYBACK: |
881 | if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
882 | for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { |
883 | if (SUBSTREAM_BUSY(substream)) |
884 | return -EAGAIN; |
885 | } |
886 | } |
887 | break; |
888 | case SNDRV_PCM_STREAM_CAPTURE: |
889 | if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
890 | for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { |
891 | if (SUBSTREAM_BUSY(substream)) |
892 | return -EAGAIN; |
893 | } |
894 | } |
895 | break; |
896 | default: |
897 | return -EINVAL; |
898 | } |
899 | |
900 | if (file->f_flags & O_APPEND) { |
901 | if (prefer_subdevice < 0) { |
902 | if (pstr->substream_count > 1) |
903 | return -EINVAL; /* must be unique */ |
904 | substream = pstr->substream; |
905 | } else { |
906 | for (substream = pstr->substream; substream; |
907 | substream = substream->next) |
908 | if (substream->number == prefer_subdevice) |
909 | break; |
910 | } |
911 | if (! substream) |
912 | return -ENODEV; |
913 | if (! SUBSTREAM_BUSY(substream)) |
914 | return -EBADFD; |
915 | substream->ref_count++; |
916 | *rsubstream = substream; |
917 | return 0; |
918 | } |
919 | |
920 | if (prefer_subdevice >= 0) { |
921 | for (substream = pstr->substream; substream; substream = substream->next) |
922 | if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) |
923 | goto __ok; |
924 | } |
925 | for (substream = pstr->substream; substream; substream = substream->next) |
926 | if (!SUBSTREAM_BUSY(substream)) |
927 | break; |
928 | __ok: |
929 | if (substream == NULL) |
930 | return -EAGAIN; |
931 | |
932 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); |
933 | if (runtime == NULL) |
934 | return -ENOMEM; |
935 | |
936 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); |
937 | runtime->status = snd_malloc_pages(size, GFP_KERNEL); |
938 | if (runtime->status == NULL) { |
939 | kfree(runtime); |
940 | return -ENOMEM; |
941 | } |
942 | memset((void*)runtime->status, 0, size); |
943 | |
944 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); |
945 | runtime->control = snd_malloc_pages(size, GFP_KERNEL); |
946 | if (runtime->control == NULL) { |
947 | snd_free_pages((void*)runtime->status, |
948 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
949 | kfree(runtime); |
950 | return -ENOMEM; |
951 | } |
952 | memset((void*)runtime->control, 0, size); |
953 | |
954 | init_waitqueue_head(&runtime->sleep); |
955 | init_waitqueue_head(&runtime->tsleep); |
956 | |
957 | runtime->status->state = SNDRV_PCM_STATE_OPEN; |
958 | |
959 | substream->runtime = runtime; |
960 | substream->private_data = pcm->private_data; |
961 | substream->ref_count = 1; |
962 | substream->f_flags = file->f_flags; |
963 | substream->pid = get_pid(task_pid(current)); |
964 | pstr->substream_opened++; |
965 | *rsubstream = substream; |
966 | return 0; |
967 | } |
968 | |
969 | void snd_pcm_detach_substream(struct snd_pcm_substream *substream) |
970 | { |
971 | struct snd_pcm_runtime *runtime; |
972 | |
973 | if (PCM_RUNTIME_CHECK(substream)) |
974 | return; |
975 | runtime = substream->runtime; |
976 | if (runtime->private_free != NULL) |
977 | runtime->private_free(runtime); |
978 | snd_free_pages((void*)runtime->status, |
979 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
980 | snd_free_pages((void*)runtime->control, |
981 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); |
982 | kfree(runtime->hw_constraints.rules); |
983 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
984 | kfree(runtime->hwptr_log); |
985 | #endif |
986 | kfree(runtime); |
987 | substream->runtime = NULL; |
988 | put_pid(substream->pid); |
989 | substream->pid = NULL; |
990 | substream->pstr->substream_opened--; |
991 | } |
992 | |
993 | static ssize_t show_pcm_class(struct device *dev, |
994 | struct device_attribute *attr, char *buf) |
995 | { |
996 | struct snd_pcm *pcm; |
997 | const char *str; |
998 | static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { |
999 | [SNDRV_PCM_CLASS_GENERIC] = "generic", |
1000 | [SNDRV_PCM_CLASS_MULTI] = "multi", |
1001 | [SNDRV_PCM_CLASS_MODEM] = "modem", |
1002 | [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", |
1003 | }; |
1004 | |
1005 | if (! (pcm = dev_get_drvdata(dev)) || |
1006 | pcm->dev_class > SNDRV_PCM_CLASS_LAST) |
1007 | str = "none"; |
1008 | else |
1009 | str = strs[pcm->dev_class]; |
1010 | return snprintf(buf, PAGE_SIZE, "%s\n", str); |
1011 | } |
1012 | |
1013 | static struct device_attribute pcm_attrs = |
1014 | __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); |
1015 | |
1016 | static int snd_pcm_dev_register(struct snd_device *device) |
1017 | { |
1018 | int cidx, err; |
1019 | struct snd_pcm_substream *substream; |
1020 | struct snd_pcm_notify *notify; |
1021 | char str[16]; |
1022 | struct snd_pcm *pcm; |
1023 | struct device *dev; |
1024 | |
1025 | if (snd_BUG_ON(!device || !device->device_data)) |
1026 | return -ENXIO; |
1027 | pcm = device->device_data; |
1028 | mutex_lock(®ister_mutex); |
1029 | err = snd_pcm_add(pcm); |
1030 | if (err) { |
1031 | mutex_unlock(®ister_mutex); |
1032 | return err; |
1033 | } |
1034 | for (cidx = 0; cidx < 2; cidx++) { |
1035 | int devtype = -1; |
1036 | if (pcm->streams[cidx].substream == NULL || pcm->internal) |
1037 | continue; |
1038 | switch (cidx) { |
1039 | case SNDRV_PCM_STREAM_PLAYBACK: |
1040 | sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); |
1041 | devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
1042 | break; |
1043 | case SNDRV_PCM_STREAM_CAPTURE: |
1044 | sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); |
1045 | devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
1046 | break; |
1047 | } |
1048 | /* device pointer to use, pcm->dev takes precedence if |
1049 | * it is assigned, otherwise fall back to card's device |
1050 | * if possible */ |
1051 | dev = pcm->dev; |
1052 | if (!dev) |
1053 | dev = snd_card_get_device_link(pcm->card); |
1054 | /* register pcm */ |
1055 | err = snd_register_device_for_dev(devtype, pcm->card, |
1056 | pcm->device, |
1057 | &snd_pcm_f_ops[cidx], |
1058 | pcm, str, dev); |
1059 | if (err < 0) { |
1060 | list_del(&pcm->list); |
1061 | mutex_unlock(®ister_mutex); |
1062 | return err; |
1063 | } |
1064 | snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, |
1065 | &pcm_attrs); |
1066 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
1067 | snd_pcm_timer_init(substream); |
1068 | } |
1069 | |
1070 | list_for_each_entry(notify, &snd_pcm_notify_list, list) |
1071 | notify->n_register(pcm); |
1072 | |
1073 | mutex_unlock(®ister_mutex); |
1074 | return 0; |
1075 | } |
1076 | |
1077 | static int snd_pcm_dev_disconnect(struct snd_device *device) |
1078 | { |
1079 | struct snd_pcm *pcm = device->device_data; |
1080 | struct snd_pcm_notify *notify; |
1081 | struct snd_pcm_substream *substream; |
1082 | int cidx, devtype; |
1083 | |
1084 | mutex_lock(®ister_mutex); |
1085 | if (list_empty(&pcm->list)) |
1086 | goto unlock; |
1087 | |
1088 | mutex_lock(&pcm->open_mutex); |
1089 | wake_up(&pcm->open_wait); |
1090 | list_del_init(&pcm->list); |
1091 | for (cidx = 0; cidx < 2; cidx++) |
1092 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { |
1093 | snd_pcm_stream_lock_irq(substream); |
1094 | if (substream->runtime) { |
1095 | substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; |
1096 | wake_up(&substream->runtime->sleep); |
1097 | wake_up(&substream->runtime->tsleep); |
1098 | } |
1099 | snd_pcm_stream_unlock_irq(substream); |
1100 | } |
1101 | list_for_each_entry(notify, &snd_pcm_notify_list, list) { |
1102 | notify->n_disconnect(pcm); |
1103 | } |
1104 | for (cidx = 0; cidx < 2; cidx++) { |
1105 | devtype = -1; |
1106 | switch (cidx) { |
1107 | case SNDRV_PCM_STREAM_PLAYBACK: |
1108 | devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
1109 | break; |
1110 | case SNDRV_PCM_STREAM_CAPTURE: |
1111 | devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
1112 | break; |
1113 | } |
1114 | snd_unregister_device(devtype, pcm->card, pcm->device); |
1115 | if (pcm->streams[cidx].chmap_kctl) { |
1116 | snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl); |
1117 | pcm->streams[cidx].chmap_kctl = NULL; |
1118 | } |
1119 | } |
1120 | mutex_unlock(&pcm->open_mutex); |
1121 | unlock: |
1122 | mutex_unlock(®ister_mutex); |
1123 | return 0; |
1124 | } |
1125 | |
1126 | int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) |
1127 | { |
1128 | struct snd_pcm *pcm; |
1129 | |
1130 | if (snd_BUG_ON(!notify || |
1131 | !notify->n_register || |
1132 | !notify->n_unregister || |
1133 | !notify->n_disconnect)) |
1134 | return -EINVAL; |
1135 | mutex_lock(®ister_mutex); |
1136 | if (nfree) { |
1137 | list_del(¬ify->list); |
1138 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
1139 | notify->n_unregister(pcm); |
1140 | } else { |
1141 | list_add_tail(¬ify->list, &snd_pcm_notify_list); |
1142 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
1143 | notify->n_register(pcm); |
1144 | } |
1145 | mutex_unlock(®ister_mutex); |
1146 | return 0; |
1147 | } |
1148 | |
1149 | EXPORT_SYMBOL(snd_pcm_notify); |
1150 | |
1151 | #ifdef CONFIG_PROC_FS |
1152 | /* |
1153 | * Info interface |
1154 | */ |
1155 | |
1156 | static void snd_pcm_proc_read(struct snd_info_entry *entry, |
1157 | struct snd_info_buffer *buffer) |
1158 | { |
1159 | struct snd_pcm *pcm; |
1160 | |
1161 | mutex_lock(®ister_mutex); |
1162 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
1163 | snd_iprintf(buffer, "%02i-%02i: %s : %s", |
1164 | pcm->card->number, pcm->device, pcm->id, pcm->name); |
1165 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) |
1166 | snd_iprintf(buffer, " : playback %i", |
1167 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); |
1168 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) |
1169 | snd_iprintf(buffer, " : capture %i", |
1170 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); |
1171 | snd_iprintf(buffer, "\n"); |
1172 | } |
1173 | mutex_unlock(®ister_mutex); |
1174 | } |
1175 | |
1176 | static struct snd_info_entry *snd_pcm_proc_entry; |
1177 | |
1178 | static void snd_pcm_proc_init(void) |
1179 | { |
1180 | struct snd_info_entry *entry; |
1181 | |
1182 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { |
1183 | snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); |
1184 | if (snd_info_register(entry) < 0) { |
1185 | snd_info_free_entry(entry); |
1186 | entry = NULL; |
1187 | } |
1188 | } |
1189 | snd_pcm_proc_entry = entry; |
1190 | } |
1191 | |
1192 | static void snd_pcm_proc_done(void) |
1193 | { |
1194 | snd_info_free_entry(snd_pcm_proc_entry); |
1195 | } |
1196 | |
1197 | #else /* !CONFIG_PROC_FS */ |
1198 | #define snd_pcm_proc_init() |
1199 | #define snd_pcm_proc_done() |
1200 | #endif /* CONFIG_PROC_FS */ |
1201 | |
1202 | |
1203 | /* |
1204 | * ENTRY functions |
1205 | */ |
1206 | |
1207 | static int __init alsa_pcm_init(void) |
1208 | { |
1209 | snd_ctl_register_ioctl(snd_pcm_control_ioctl); |
1210 | snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); |
1211 | snd_pcm_proc_init(); |
1212 | return 0; |
1213 | } |
1214 | |
1215 | static void __exit alsa_pcm_exit(void) |
1216 | { |
1217 | snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); |
1218 | snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); |
1219 | snd_pcm_proc_done(); |
1220 | } |
1221 | |
1222 | module_init(alsa_pcm_init) |
1223 | module_exit(alsa_pcm_exit) |
1224 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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