Root/
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/time.h> |
25 | #include <linux/mutex.h> |
26 | #include <sound/core.h> |
27 | #include <sound/minors.h> |
28 | #include <sound/pcm.h> |
29 | #include <sound/control.h> |
30 | #include <sound/info.h> |
31 | |
32 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); |
33 | MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); |
34 | MODULE_LICENSE("GPL"); |
35 | |
36 | static LIST_HEAD(snd_pcm_devices); |
37 | static LIST_HEAD(snd_pcm_notify_list); |
38 | static DEFINE_MUTEX(register_mutex); |
39 | |
40 | static int snd_pcm_free(struct snd_pcm *pcm); |
41 | static int snd_pcm_dev_free(struct snd_device *device); |
42 | static int snd_pcm_dev_register(struct snd_device *device); |
43 | static int snd_pcm_dev_disconnect(struct snd_device *device); |
44 | |
45 | static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) |
46 | { |
47 | struct snd_pcm *pcm; |
48 | |
49 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
50 | if (pcm->card == card && pcm->device == device) |
51 | return pcm; |
52 | } |
53 | return NULL; |
54 | } |
55 | |
56 | static int snd_pcm_next(struct snd_card *card, int device) |
57 | { |
58 | struct snd_pcm *pcm; |
59 | |
60 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
61 | if (pcm->card == card && pcm->device > device) |
62 | return pcm->device; |
63 | else if (pcm->card->number > card->number) |
64 | return -1; |
65 | } |
66 | return -1; |
67 | } |
68 | |
69 | static int snd_pcm_add(struct snd_pcm *newpcm) |
70 | { |
71 | struct snd_pcm *pcm; |
72 | |
73 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
74 | if (pcm->card == newpcm->card && pcm->device == newpcm->device) |
75 | return -EBUSY; |
76 | if (pcm->card->number > newpcm->card->number || |
77 | (pcm->card == newpcm->card && |
78 | pcm->device > newpcm->device)) { |
79 | list_add(&newpcm->list, pcm->list.prev); |
80 | return 0; |
81 | } |
82 | } |
83 | list_add_tail(&newpcm->list, &snd_pcm_devices); |
84 | return 0; |
85 | } |
86 | |
87 | static int snd_pcm_control_ioctl(struct snd_card *card, |
88 | struct snd_ctl_file *control, |
89 | unsigned int cmd, unsigned long arg) |
90 | { |
91 | switch (cmd) { |
92 | case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: |
93 | { |
94 | int device; |
95 | |
96 | if (get_user(device, (int __user *)arg)) |
97 | return -EFAULT; |
98 | mutex_lock(®ister_mutex); |
99 | device = snd_pcm_next(card, device); |
100 | mutex_unlock(®ister_mutex); |
101 | if (put_user(device, (int __user *)arg)) |
102 | return -EFAULT; |
103 | return 0; |
104 | } |
105 | case SNDRV_CTL_IOCTL_PCM_INFO: |
106 | { |
107 | struct snd_pcm_info __user *info; |
108 | unsigned int device, subdevice; |
109 | int stream; |
110 | struct snd_pcm *pcm; |
111 | struct snd_pcm_str *pstr; |
112 | struct snd_pcm_substream *substream; |
113 | int err; |
114 | |
115 | info = (struct snd_pcm_info __user *)arg; |
116 | if (get_user(device, &info->device)) |
117 | return -EFAULT; |
118 | if (get_user(stream, &info->stream)) |
119 | return -EFAULT; |
120 | if (stream < 0 || stream > 1) |
121 | return -EINVAL; |
122 | if (get_user(subdevice, &info->subdevice)) |
123 | return -EFAULT; |
124 | mutex_lock(®ister_mutex); |
125 | pcm = snd_pcm_get(card, device); |
126 | if (pcm == NULL) { |
127 | err = -ENXIO; |
128 | goto _error; |
129 | } |
130 | pstr = &pcm->streams[stream]; |
131 | if (pstr->substream_count == 0) { |
132 | err = -ENOENT; |
133 | goto _error; |
134 | } |
135 | if (subdevice >= pstr->substream_count) { |
136 | err = -ENXIO; |
137 | goto _error; |
138 | } |
139 | for (substream = pstr->substream; substream; |
140 | substream = substream->next) |
141 | if (substream->number == (int)subdevice) |
142 | break; |
143 | if (substream == NULL) { |
144 | err = -ENXIO; |
145 | goto _error; |
146 | } |
147 | err = snd_pcm_info_user(substream, info); |
148 | _error: |
149 | mutex_unlock(®ister_mutex); |
150 | return err; |
151 | } |
152 | case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: |
153 | { |
154 | int val; |
155 | |
156 | if (get_user(val, (int __user *)arg)) |
157 | return -EFAULT; |
158 | control->prefer_pcm_subdevice = val; |
159 | return 0; |
160 | } |
161 | } |
162 | return -ENOIOCTLCMD; |
163 | } |
164 | |
165 | #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v |
166 | |
167 | static char *snd_pcm_format_names[] = { |
168 | FORMAT(S8), |
169 | FORMAT(U8), |
170 | FORMAT(S16_LE), |
171 | FORMAT(S16_BE), |
172 | FORMAT(U16_LE), |
173 | FORMAT(U16_BE), |
174 | FORMAT(S24_LE), |
175 | FORMAT(S24_BE), |
176 | FORMAT(U24_LE), |
177 | FORMAT(U24_BE), |
178 | FORMAT(S32_LE), |
179 | FORMAT(S32_BE), |
180 | FORMAT(U32_LE), |
181 | FORMAT(U32_BE), |
182 | FORMAT(FLOAT_LE), |
183 | FORMAT(FLOAT_BE), |
184 | FORMAT(FLOAT64_LE), |
185 | FORMAT(FLOAT64_BE), |
186 | FORMAT(IEC958_SUBFRAME_LE), |
187 | FORMAT(IEC958_SUBFRAME_BE), |
188 | FORMAT(MU_LAW), |
189 | FORMAT(A_LAW), |
190 | FORMAT(IMA_ADPCM), |
191 | FORMAT(MPEG), |
192 | FORMAT(GSM), |
193 | FORMAT(SPECIAL), |
194 | FORMAT(S24_3LE), |
195 | FORMAT(S24_3BE), |
196 | FORMAT(U24_3LE), |
197 | FORMAT(U24_3BE), |
198 | FORMAT(S20_3LE), |
199 | FORMAT(S20_3BE), |
200 | FORMAT(U20_3LE), |
201 | FORMAT(U20_3BE), |
202 | FORMAT(S18_3LE), |
203 | FORMAT(S18_3BE), |
204 | FORMAT(U18_3LE), |
205 | FORMAT(U18_3BE), |
206 | }; |
207 | |
208 | const char *snd_pcm_format_name(snd_pcm_format_t format) |
209 | { |
210 | return snd_pcm_format_names[format]; |
211 | } |
212 | EXPORT_SYMBOL_GPL(snd_pcm_format_name); |
213 | |
214 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
215 | |
216 | #define STATE(v) [SNDRV_PCM_STATE_##v] = #v |
217 | #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v |
218 | #define READY(v) [SNDRV_PCM_READY_##v] = #v |
219 | #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v |
220 | #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v |
221 | #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v |
222 | #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v |
223 | #define START(v) [SNDRV_PCM_START_##v] = #v |
224 | #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v |
225 | |
226 | static char *snd_pcm_stream_names[] = { |
227 | STREAM(PLAYBACK), |
228 | STREAM(CAPTURE), |
229 | }; |
230 | |
231 | static char *snd_pcm_state_names[] = { |
232 | STATE(OPEN), |
233 | STATE(SETUP), |
234 | STATE(PREPARED), |
235 | STATE(RUNNING), |
236 | STATE(XRUN), |
237 | STATE(DRAINING), |
238 | STATE(PAUSED), |
239 | STATE(SUSPENDED), |
240 | }; |
241 | |
242 | static char *snd_pcm_access_names[] = { |
243 | ACCESS(MMAP_INTERLEAVED), |
244 | ACCESS(MMAP_NONINTERLEAVED), |
245 | ACCESS(MMAP_COMPLEX), |
246 | ACCESS(RW_INTERLEAVED), |
247 | ACCESS(RW_NONINTERLEAVED), |
248 | }; |
249 | |
250 | static char *snd_pcm_subformat_names[] = { |
251 | SUBFORMAT(STD), |
252 | }; |
253 | |
254 | static char *snd_pcm_tstamp_mode_names[] = { |
255 | TSTAMP(NONE), |
256 | TSTAMP(ENABLE), |
257 | }; |
258 | |
259 | static const char *snd_pcm_stream_name(int stream) |
260 | { |
261 | return snd_pcm_stream_names[stream]; |
262 | } |
263 | |
264 | static const char *snd_pcm_access_name(snd_pcm_access_t access) |
265 | { |
266 | return snd_pcm_access_names[access]; |
267 | } |
268 | |
269 | static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) |
270 | { |
271 | return snd_pcm_subformat_names[subformat]; |
272 | } |
273 | |
274 | static const char *snd_pcm_tstamp_mode_name(int mode) |
275 | { |
276 | return snd_pcm_tstamp_mode_names[mode]; |
277 | } |
278 | |
279 | static const char *snd_pcm_state_name(snd_pcm_state_t state) |
280 | { |
281 | return snd_pcm_state_names[state]; |
282 | } |
283 | |
284 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
285 | #include <linux/soundcard.h> |
286 | |
287 | static const char *snd_pcm_oss_format_name(int format) |
288 | { |
289 | switch (format) { |
290 | case AFMT_MU_LAW: |
291 | return "MU_LAW"; |
292 | case AFMT_A_LAW: |
293 | return "A_LAW"; |
294 | case AFMT_IMA_ADPCM: |
295 | return "IMA_ADPCM"; |
296 | case AFMT_U8: |
297 | return "U8"; |
298 | case AFMT_S16_LE: |
299 | return "S16_LE"; |
300 | case AFMT_S16_BE: |
301 | return "S16_BE"; |
302 | case AFMT_S8: |
303 | return "S8"; |
304 | case AFMT_U16_LE: |
305 | return "U16_LE"; |
306 | case AFMT_U16_BE: |
307 | return "U16_BE"; |
308 | case AFMT_MPEG: |
309 | return "MPEG"; |
310 | default: |
311 | return "unknown"; |
312 | } |
313 | } |
314 | #endif |
315 | |
316 | static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, |
317 | struct snd_info_buffer *buffer) |
318 | { |
319 | struct snd_pcm_info *info; |
320 | int err; |
321 | |
322 | if (! substream) |
323 | return; |
324 | |
325 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
326 | if (! info) { |
327 | printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); |
328 | return; |
329 | } |
330 | |
331 | err = snd_pcm_info(substream, info); |
332 | if (err < 0) { |
333 | snd_iprintf(buffer, "error %d\n", err); |
334 | kfree(info); |
335 | return; |
336 | } |
337 | snd_iprintf(buffer, "card: %d\n", info->card); |
338 | snd_iprintf(buffer, "device: %d\n", info->device); |
339 | snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); |
340 | snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); |
341 | snd_iprintf(buffer, "id: %s\n", info->id); |
342 | snd_iprintf(buffer, "name: %s\n", info->name); |
343 | snd_iprintf(buffer, "subname: %s\n", info->subname); |
344 | snd_iprintf(buffer, "class: %d\n", info->dev_class); |
345 | snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); |
346 | snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); |
347 | snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); |
348 | kfree(info); |
349 | } |
350 | |
351 | static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, |
352 | struct snd_info_buffer *buffer) |
353 | { |
354 | snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, |
355 | buffer); |
356 | } |
357 | |
358 | static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, |
359 | struct snd_info_buffer *buffer) |
360 | { |
361 | snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, |
362 | buffer); |
363 | } |
364 | |
365 | static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, |
366 | struct snd_info_buffer *buffer) |
367 | { |
368 | struct snd_pcm_substream *substream = entry->private_data; |
369 | struct snd_pcm_runtime *runtime = substream->runtime; |
370 | if (!runtime) { |
371 | snd_iprintf(buffer, "closed\n"); |
372 | return; |
373 | } |
374 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
375 | snd_iprintf(buffer, "no setup\n"); |
376 | return; |
377 | } |
378 | snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); |
379 | snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); |
380 | snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); |
381 | snd_iprintf(buffer, "channels: %u\n", runtime->channels); |
382 | snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); |
383 | snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); |
384 | snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); |
385 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
386 | if (substream->oss.oss) { |
387 | snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); |
388 | snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); |
389 | snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); |
390 | snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); |
391 | snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); |
392 | snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); |
393 | } |
394 | #endif |
395 | } |
396 | |
397 | static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, |
398 | struct snd_info_buffer *buffer) |
399 | { |
400 | struct snd_pcm_substream *substream = entry->private_data; |
401 | struct snd_pcm_runtime *runtime = substream->runtime; |
402 | if (!runtime) { |
403 | snd_iprintf(buffer, "closed\n"); |
404 | return; |
405 | } |
406 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { |
407 | snd_iprintf(buffer, "no setup\n"); |
408 | return; |
409 | } |
410 | snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); |
411 | snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); |
412 | snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); |
413 | snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); |
414 | snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); |
415 | snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); |
416 | snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); |
417 | snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); |
418 | } |
419 | |
420 | static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, |
421 | struct snd_info_buffer *buffer) |
422 | { |
423 | struct snd_pcm_substream *substream = entry->private_data; |
424 | struct snd_pcm_runtime *runtime = substream->runtime; |
425 | struct snd_pcm_status status; |
426 | int err; |
427 | if (!runtime) { |
428 | snd_iprintf(buffer, "closed\n"); |
429 | return; |
430 | } |
431 | memset(&status, 0, sizeof(status)); |
432 | err = snd_pcm_status(substream, &status); |
433 | if (err < 0) { |
434 | snd_iprintf(buffer, "error %d\n", err); |
435 | return; |
436 | } |
437 | snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); |
438 | snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); |
439 | snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", |
440 | status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); |
441 | snd_iprintf(buffer, "tstamp : %ld.%09ld\n", |
442 | status.tstamp.tv_sec, status.tstamp.tv_nsec); |
443 | snd_iprintf(buffer, "delay : %ld\n", status.delay); |
444 | snd_iprintf(buffer, "avail : %ld\n", status.avail); |
445 | snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); |
446 | snd_iprintf(buffer, "-----\n"); |
447 | snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); |
448 | snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); |
449 | } |
450 | |
451 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
452 | static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, |
453 | struct snd_info_buffer *buffer) |
454 | { |
455 | struct snd_pcm_str *pstr = entry->private_data; |
456 | snd_iprintf(buffer, "%d\n", pstr->xrun_debug); |
457 | } |
458 | |
459 | static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, |
460 | struct snd_info_buffer *buffer) |
461 | { |
462 | struct snd_pcm_str *pstr = entry->private_data; |
463 | char line[64]; |
464 | if (!snd_info_get_line(buffer, line, sizeof(line))) |
465 | pstr->xrun_debug = simple_strtoul(line, NULL, 10); |
466 | } |
467 | #endif |
468 | |
469 | static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) |
470 | { |
471 | struct snd_pcm *pcm = pstr->pcm; |
472 | struct snd_info_entry *entry; |
473 | char name[16]; |
474 | |
475 | sprintf(name, "pcm%i%c", pcm->device, |
476 | pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); |
477 | if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) |
478 | return -ENOMEM; |
479 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
480 | if (snd_info_register(entry) < 0) { |
481 | snd_info_free_entry(entry); |
482 | return -ENOMEM; |
483 | } |
484 | pstr->proc_root = entry; |
485 | |
486 | if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { |
487 | snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); |
488 | if (snd_info_register(entry) < 0) { |
489 | snd_info_free_entry(entry); |
490 | entry = NULL; |
491 | } |
492 | } |
493 | pstr->proc_info_entry = entry; |
494 | |
495 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
496 | if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", |
497 | pstr->proc_root)) != NULL) { |
498 | entry->c.text.read = snd_pcm_xrun_debug_read; |
499 | entry->c.text.write = snd_pcm_xrun_debug_write; |
500 | entry->mode |= S_IWUSR; |
501 | entry->private_data = pstr; |
502 | if (snd_info_register(entry) < 0) { |
503 | snd_info_free_entry(entry); |
504 | entry = NULL; |
505 | } |
506 | } |
507 | pstr->proc_xrun_debug_entry = entry; |
508 | #endif |
509 | return 0; |
510 | } |
511 | |
512 | static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) |
513 | { |
514 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
515 | snd_info_free_entry(pstr->proc_xrun_debug_entry); |
516 | pstr->proc_xrun_debug_entry = NULL; |
517 | #endif |
518 | snd_info_free_entry(pstr->proc_info_entry); |
519 | pstr->proc_info_entry = NULL; |
520 | snd_info_free_entry(pstr->proc_root); |
521 | pstr->proc_root = NULL; |
522 | return 0; |
523 | } |
524 | |
525 | static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) |
526 | { |
527 | struct snd_info_entry *entry; |
528 | struct snd_card *card; |
529 | char name[16]; |
530 | |
531 | card = substream->pcm->card; |
532 | |
533 | sprintf(name, "sub%i", substream->number); |
534 | if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) |
535 | return -ENOMEM; |
536 | entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; |
537 | if (snd_info_register(entry) < 0) { |
538 | snd_info_free_entry(entry); |
539 | return -ENOMEM; |
540 | } |
541 | substream->proc_root = entry; |
542 | |
543 | if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { |
544 | snd_info_set_text_ops(entry, substream, |
545 | snd_pcm_substream_proc_info_read); |
546 | if (snd_info_register(entry) < 0) { |
547 | snd_info_free_entry(entry); |
548 | entry = NULL; |
549 | } |
550 | } |
551 | substream->proc_info_entry = entry; |
552 | |
553 | if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { |
554 | snd_info_set_text_ops(entry, substream, |
555 | snd_pcm_substream_proc_hw_params_read); |
556 | if (snd_info_register(entry) < 0) { |
557 | snd_info_free_entry(entry); |
558 | entry = NULL; |
559 | } |
560 | } |
561 | substream->proc_hw_params_entry = entry; |
562 | |
563 | if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { |
564 | snd_info_set_text_ops(entry, substream, |
565 | snd_pcm_substream_proc_sw_params_read); |
566 | if (snd_info_register(entry) < 0) { |
567 | snd_info_free_entry(entry); |
568 | entry = NULL; |
569 | } |
570 | } |
571 | substream->proc_sw_params_entry = entry; |
572 | |
573 | if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { |
574 | snd_info_set_text_ops(entry, substream, |
575 | snd_pcm_substream_proc_status_read); |
576 | if (snd_info_register(entry) < 0) { |
577 | snd_info_free_entry(entry); |
578 | entry = NULL; |
579 | } |
580 | } |
581 | substream->proc_status_entry = entry; |
582 | |
583 | return 0; |
584 | } |
585 | |
586 | static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) |
587 | { |
588 | snd_info_free_entry(substream->proc_info_entry); |
589 | substream->proc_info_entry = NULL; |
590 | snd_info_free_entry(substream->proc_hw_params_entry); |
591 | substream->proc_hw_params_entry = NULL; |
592 | snd_info_free_entry(substream->proc_sw_params_entry); |
593 | substream->proc_sw_params_entry = NULL; |
594 | snd_info_free_entry(substream->proc_status_entry); |
595 | substream->proc_status_entry = NULL; |
596 | snd_info_free_entry(substream->proc_root); |
597 | substream->proc_root = NULL; |
598 | return 0; |
599 | } |
600 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
601 | static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } |
602 | static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } |
603 | static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } |
604 | static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } |
605 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
606 | |
607 | /** |
608 | * snd_pcm_new_stream - create a new PCM stream |
609 | * @pcm: the pcm instance |
610 | * @stream: the stream direction, SNDRV_PCM_STREAM_XXX |
611 | * @substream_count: the number of substreams |
612 | * |
613 | * Creates a new stream for the pcm. |
614 | * The corresponding stream on the pcm must have been empty before |
615 | * calling this, i.e. zero must be given to the argument of |
616 | * snd_pcm_new(). |
617 | * |
618 | * Returns zero if successful, or a negative error code on failure. |
619 | */ |
620 | int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) |
621 | { |
622 | int idx, err; |
623 | struct snd_pcm_str *pstr = &pcm->streams[stream]; |
624 | struct snd_pcm_substream *substream, *prev; |
625 | |
626 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
627 | mutex_init(&pstr->oss.setup_mutex); |
628 | #endif |
629 | pstr->stream = stream; |
630 | pstr->pcm = pcm; |
631 | pstr->substream_count = substream_count; |
632 | if (substream_count > 0) { |
633 | err = snd_pcm_stream_proc_init(pstr); |
634 | if (err < 0) { |
635 | snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); |
636 | return err; |
637 | } |
638 | } |
639 | prev = NULL; |
640 | for (idx = 0, prev = NULL; idx < substream_count; idx++) { |
641 | substream = kzalloc(sizeof(*substream), GFP_KERNEL); |
642 | if (substream == NULL) { |
643 | snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); |
644 | return -ENOMEM; |
645 | } |
646 | substream->pcm = pcm; |
647 | substream->pstr = pstr; |
648 | substream->number = idx; |
649 | substream->stream = stream; |
650 | sprintf(substream->name, "subdevice #%i", idx); |
651 | snprintf(substream->latency_id, sizeof(substream->latency_id), |
652 | "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device, |
653 | (stream ? 'c' : 'p'), idx); |
654 | substream->buffer_bytes_max = UINT_MAX; |
655 | if (prev == NULL) |
656 | pstr->substream = substream; |
657 | else |
658 | prev->next = substream; |
659 | err = snd_pcm_substream_proc_init(substream); |
660 | if (err < 0) { |
661 | snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); |
662 | if (prev == NULL) |
663 | pstr->substream = NULL; |
664 | else |
665 | prev->next = NULL; |
666 | kfree(substream); |
667 | return err; |
668 | } |
669 | substream->group = &substream->self_group; |
670 | spin_lock_init(&substream->self_group.lock); |
671 | INIT_LIST_HEAD(&substream->self_group.substreams); |
672 | list_add_tail(&substream->link_list, &substream->self_group.substreams); |
673 | atomic_set(&substream->mmap_count, 0); |
674 | prev = substream; |
675 | } |
676 | return 0; |
677 | } |
678 | |
679 | EXPORT_SYMBOL(snd_pcm_new_stream); |
680 | |
681 | /** |
682 | * snd_pcm_new - create a new PCM instance |
683 | * @card: the card instance |
684 | * @id: the id string |
685 | * @device: the device index (zero based) |
686 | * @playback_count: the number of substreams for playback |
687 | * @capture_count: the number of substreams for capture |
688 | * @rpcm: the pointer to store the new pcm instance |
689 | * |
690 | * Creates a new PCM instance. |
691 | * |
692 | * The pcm operators have to be set afterwards to the new instance |
693 | * via snd_pcm_set_ops(). |
694 | * |
695 | * Returns zero if successful, or a negative error code on failure. |
696 | */ |
697 | int snd_pcm_new(struct snd_card *card, const char *id, int device, |
698 | int playback_count, int capture_count, |
699 | struct snd_pcm ** rpcm) |
700 | { |
701 | struct snd_pcm *pcm; |
702 | int err; |
703 | static struct snd_device_ops ops = { |
704 | .dev_free = snd_pcm_dev_free, |
705 | .dev_register = snd_pcm_dev_register, |
706 | .dev_disconnect = snd_pcm_dev_disconnect, |
707 | }; |
708 | |
709 | if (snd_BUG_ON(!card)) |
710 | return -ENXIO; |
711 | if (rpcm) |
712 | *rpcm = NULL; |
713 | pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
714 | if (pcm == NULL) { |
715 | snd_printk(KERN_ERR "Cannot allocate PCM\n"); |
716 | return -ENOMEM; |
717 | } |
718 | pcm->card = card; |
719 | pcm->device = device; |
720 | if (id) |
721 | strlcpy(pcm->id, id, sizeof(pcm->id)); |
722 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { |
723 | snd_pcm_free(pcm); |
724 | return err; |
725 | } |
726 | if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { |
727 | snd_pcm_free(pcm); |
728 | return err; |
729 | } |
730 | mutex_init(&pcm->open_mutex); |
731 | init_waitqueue_head(&pcm->open_wait); |
732 | if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { |
733 | snd_pcm_free(pcm); |
734 | return err; |
735 | } |
736 | if (rpcm) |
737 | *rpcm = pcm; |
738 | return 0; |
739 | } |
740 | |
741 | EXPORT_SYMBOL(snd_pcm_new); |
742 | |
743 | static void snd_pcm_free_stream(struct snd_pcm_str * pstr) |
744 | { |
745 | struct snd_pcm_substream *substream, *substream_next; |
746 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
747 | struct snd_pcm_oss_setup *setup, *setupn; |
748 | #endif |
749 | substream = pstr->substream; |
750 | while (substream) { |
751 | substream_next = substream->next; |
752 | snd_pcm_timer_done(substream); |
753 | snd_pcm_substream_proc_done(substream); |
754 | kfree(substream); |
755 | substream = substream_next; |
756 | } |
757 | snd_pcm_stream_proc_done(pstr); |
758 | #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
759 | for (setup = pstr->oss.setup_list; setup; setup = setupn) { |
760 | setupn = setup->next; |
761 | kfree(setup->task_name); |
762 | kfree(setup); |
763 | } |
764 | #endif |
765 | } |
766 | |
767 | static int snd_pcm_free(struct snd_pcm *pcm) |
768 | { |
769 | struct snd_pcm_notify *notify; |
770 | |
771 | if (!pcm) |
772 | return 0; |
773 | list_for_each_entry(notify, &snd_pcm_notify_list, list) { |
774 | notify->n_unregister(pcm); |
775 | } |
776 | if (pcm->private_free) |
777 | pcm->private_free(pcm); |
778 | snd_pcm_lib_preallocate_free_for_all(pcm); |
779 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); |
780 | snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); |
781 | kfree(pcm); |
782 | return 0; |
783 | } |
784 | |
785 | static int snd_pcm_dev_free(struct snd_device *device) |
786 | { |
787 | struct snd_pcm *pcm = device->device_data; |
788 | return snd_pcm_free(pcm); |
789 | } |
790 | |
791 | int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, |
792 | struct file *file, |
793 | struct snd_pcm_substream **rsubstream) |
794 | { |
795 | struct snd_pcm_str * pstr; |
796 | struct snd_pcm_substream *substream; |
797 | struct snd_pcm_runtime *runtime; |
798 | struct snd_ctl_file *kctl; |
799 | struct snd_card *card; |
800 | int prefer_subdevice = -1; |
801 | size_t size; |
802 | |
803 | if (snd_BUG_ON(!pcm || !rsubstream)) |
804 | return -ENXIO; |
805 | *rsubstream = NULL; |
806 | pstr = &pcm->streams[stream]; |
807 | if (pstr->substream == NULL || pstr->substream_count == 0) |
808 | return -ENODEV; |
809 | |
810 | card = pcm->card; |
811 | read_lock(&card->ctl_files_rwlock); |
812 | list_for_each_entry(kctl, &card->ctl_files, list) { |
813 | if (kctl->pid == task_pid(current)) { |
814 | prefer_subdevice = kctl->prefer_pcm_subdevice; |
815 | if (prefer_subdevice != -1) |
816 | break; |
817 | } |
818 | } |
819 | read_unlock(&card->ctl_files_rwlock); |
820 | |
821 | switch (stream) { |
822 | case SNDRV_PCM_STREAM_PLAYBACK: |
823 | if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
824 | for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { |
825 | if (SUBSTREAM_BUSY(substream)) |
826 | return -EAGAIN; |
827 | } |
828 | } |
829 | break; |
830 | case SNDRV_PCM_STREAM_CAPTURE: |
831 | if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { |
832 | for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { |
833 | if (SUBSTREAM_BUSY(substream)) |
834 | return -EAGAIN; |
835 | } |
836 | } |
837 | break; |
838 | default: |
839 | return -EINVAL; |
840 | } |
841 | |
842 | if (file->f_flags & O_APPEND) { |
843 | if (prefer_subdevice < 0) { |
844 | if (pstr->substream_count > 1) |
845 | return -EINVAL; /* must be unique */ |
846 | substream = pstr->substream; |
847 | } else { |
848 | for (substream = pstr->substream; substream; |
849 | substream = substream->next) |
850 | if (substream->number == prefer_subdevice) |
851 | break; |
852 | } |
853 | if (! substream) |
854 | return -ENODEV; |
855 | if (! SUBSTREAM_BUSY(substream)) |
856 | return -EBADFD; |
857 | substream->ref_count++; |
858 | *rsubstream = substream; |
859 | return 0; |
860 | } |
861 | |
862 | if (prefer_subdevice >= 0) { |
863 | for (substream = pstr->substream; substream; substream = substream->next) |
864 | if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) |
865 | goto __ok; |
866 | } |
867 | for (substream = pstr->substream; substream; substream = substream->next) |
868 | if (!SUBSTREAM_BUSY(substream)) |
869 | break; |
870 | __ok: |
871 | if (substream == NULL) |
872 | return -EAGAIN; |
873 | |
874 | runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); |
875 | if (runtime == NULL) |
876 | return -ENOMEM; |
877 | |
878 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); |
879 | runtime->status = snd_malloc_pages(size, GFP_KERNEL); |
880 | if (runtime->status == NULL) { |
881 | kfree(runtime); |
882 | return -ENOMEM; |
883 | } |
884 | memset((void*)runtime->status, 0, size); |
885 | |
886 | size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); |
887 | runtime->control = snd_malloc_pages(size, GFP_KERNEL); |
888 | if (runtime->control == NULL) { |
889 | snd_free_pages((void*)runtime->status, |
890 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
891 | kfree(runtime); |
892 | return -ENOMEM; |
893 | } |
894 | memset((void*)runtime->control, 0, size); |
895 | |
896 | init_waitqueue_head(&runtime->sleep); |
897 | init_waitqueue_head(&runtime->tsleep); |
898 | |
899 | runtime->status->state = SNDRV_PCM_STATE_OPEN; |
900 | |
901 | substream->runtime = runtime; |
902 | substream->private_data = pcm->private_data; |
903 | substream->ref_count = 1; |
904 | substream->f_flags = file->f_flags; |
905 | substream->pid = get_pid(task_pid(current)); |
906 | pstr->substream_opened++; |
907 | *rsubstream = substream; |
908 | return 0; |
909 | } |
910 | |
911 | void snd_pcm_detach_substream(struct snd_pcm_substream *substream) |
912 | { |
913 | struct snd_pcm_runtime *runtime; |
914 | |
915 | if (PCM_RUNTIME_CHECK(substream)) |
916 | return; |
917 | runtime = substream->runtime; |
918 | if (runtime->private_free != NULL) |
919 | runtime->private_free(runtime); |
920 | snd_free_pages((void*)runtime->status, |
921 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); |
922 | snd_free_pages((void*)runtime->control, |
923 | PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); |
924 | kfree(runtime->hw_constraints.rules); |
925 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
926 | if (runtime->hwptr_log) |
927 | kfree(runtime->hwptr_log); |
928 | #endif |
929 | kfree(runtime); |
930 | substream->runtime = NULL; |
931 | put_pid(substream->pid); |
932 | substream->pid = NULL; |
933 | substream->pstr->substream_opened--; |
934 | } |
935 | |
936 | static ssize_t show_pcm_class(struct device *dev, |
937 | struct device_attribute *attr, char *buf) |
938 | { |
939 | struct snd_pcm *pcm; |
940 | const char *str; |
941 | static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { |
942 | [SNDRV_PCM_CLASS_GENERIC] = "generic", |
943 | [SNDRV_PCM_CLASS_MULTI] = "multi", |
944 | [SNDRV_PCM_CLASS_MODEM] = "modem", |
945 | [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", |
946 | }; |
947 | |
948 | if (! (pcm = dev_get_drvdata(dev)) || |
949 | pcm->dev_class > SNDRV_PCM_CLASS_LAST) |
950 | str = "none"; |
951 | else |
952 | str = strs[pcm->dev_class]; |
953 | return snprintf(buf, PAGE_SIZE, "%s\n", str); |
954 | } |
955 | |
956 | static struct device_attribute pcm_attrs = |
957 | __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); |
958 | |
959 | static int snd_pcm_dev_register(struct snd_device *device) |
960 | { |
961 | int cidx, err; |
962 | struct snd_pcm_substream *substream; |
963 | struct snd_pcm_notify *notify; |
964 | char str[16]; |
965 | struct snd_pcm *pcm; |
966 | struct device *dev; |
967 | |
968 | if (snd_BUG_ON(!device || !device->device_data)) |
969 | return -ENXIO; |
970 | pcm = device->device_data; |
971 | mutex_lock(®ister_mutex); |
972 | err = snd_pcm_add(pcm); |
973 | if (err) { |
974 | mutex_unlock(®ister_mutex); |
975 | return err; |
976 | } |
977 | for (cidx = 0; cidx < 2; cidx++) { |
978 | int devtype = -1; |
979 | if (pcm->streams[cidx].substream == NULL) |
980 | continue; |
981 | switch (cidx) { |
982 | case SNDRV_PCM_STREAM_PLAYBACK: |
983 | sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); |
984 | devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
985 | break; |
986 | case SNDRV_PCM_STREAM_CAPTURE: |
987 | sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); |
988 | devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
989 | break; |
990 | } |
991 | /* device pointer to use, pcm->dev takes precedence if |
992 | * it is assigned, otherwise fall back to card's device |
993 | * if possible */ |
994 | dev = pcm->dev; |
995 | if (!dev) |
996 | dev = snd_card_get_device_link(pcm->card); |
997 | /* register pcm */ |
998 | err = snd_register_device_for_dev(devtype, pcm->card, |
999 | pcm->device, |
1000 | &snd_pcm_f_ops[cidx], |
1001 | pcm, str, dev); |
1002 | if (err < 0) { |
1003 | list_del(&pcm->list); |
1004 | mutex_unlock(®ister_mutex); |
1005 | return err; |
1006 | } |
1007 | snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, |
1008 | &pcm_attrs); |
1009 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
1010 | snd_pcm_timer_init(substream); |
1011 | } |
1012 | |
1013 | list_for_each_entry(notify, &snd_pcm_notify_list, list) |
1014 | notify->n_register(pcm); |
1015 | |
1016 | mutex_unlock(®ister_mutex); |
1017 | return 0; |
1018 | } |
1019 | |
1020 | static int snd_pcm_dev_disconnect(struct snd_device *device) |
1021 | { |
1022 | struct snd_pcm *pcm = device->device_data; |
1023 | struct snd_pcm_notify *notify; |
1024 | struct snd_pcm_substream *substream; |
1025 | int cidx, devtype; |
1026 | |
1027 | mutex_lock(®ister_mutex); |
1028 | if (list_empty(&pcm->list)) |
1029 | goto unlock; |
1030 | |
1031 | list_del_init(&pcm->list); |
1032 | for (cidx = 0; cidx < 2; cidx++) |
1033 | for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) |
1034 | if (substream->runtime) |
1035 | substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; |
1036 | list_for_each_entry(notify, &snd_pcm_notify_list, list) { |
1037 | notify->n_disconnect(pcm); |
1038 | } |
1039 | for (cidx = 0; cidx < 2; cidx++) { |
1040 | devtype = -1; |
1041 | switch (cidx) { |
1042 | case SNDRV_PCM_STREAM_PLAYBACK: |
1043 | devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; |
1044 | break; |
1045 | case SNDRV_PCM_STREAM_CAPTURE: |
1046 | devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; |
1047 | break; |
1048 | } |
1049 | snd_unregister_device(devtype, pcm->card, pcm->device); |
1050 | } |
1051 | unlock: |
1052 | mutex_unlock(®ister_mutex); |
1053 | return 0; |
1054 | } |
1055 | |
1056 | int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) |
1057 | { |
1058 | struct snd_pcm *pcm; |
1059 | |
1060 | if (snd_BUG_ON(!notify || |
1061 | !notify->n_register || |
1062 | !notify->n_unregister || |
1063 | !notify->n_disconnect)) |
1064 | return -EINVAL; |
1065 | mutex_lock(®ister_mutex); |
1066 | if (nfree) { |
1067 | list_del(¬ify->list); |
1068 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
1069 | notify->n_unregister(pcm); |
1070 | } else { |
1071 | list_add_tail(¬ify->list, &snd_pcm_notify_list); |
1072 | list_for_each_entry(pcm, &snd_pcm_devices, list) |
1073 | notify->n_register(pcm); |
1074 | } |
1075 | mutex_unlock(®ister_mutex); |
1076 | return 0; |
1077 | } |
1078 | |
1079 | EXPORT_SYMBOL(snd_pcm_notify); |
1080 | |
1081 | #ifdef CONFIG_PROC_FS |
1082 | /* |
1083 | * Info interface |
1084 | */ |
1085 | |
1086 | static void snd_pcm_proc_read(struct snd_info_entry *entry, |
1087 | struct snd_info_buffer *buffer) |
1088 | { |
1089 | struct snd_pcm *pcm; |
1090 | |
1091 | mutex_lock(®ister_mutex); |
1092 | list_for_each_entry(pcm, &snd_pcm_devices, list) { |
1093 | snd_iprintf(buffer, "%02i-%02i: %s : %s", |
1094 | pcm->card->number, pcm->device, pcm->id, pcm->name); |
1095 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) |
1096 | snd_iprintf(buffer, " : playback %i", |
1097 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); |
1098 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) |
1099 | snd_iprintf(buffer, " : capture %i", |
1100 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); |
1101 | snd_iprintf(buffer, "\n"); |
1102 | } |
1103 | mutex_unlock(®ister_mutex); |
1104 | } |
1105 | |
1106 | static struct snd_info_entry *snd_pcm_proc_entry; |
1107 | |
1108 | static void snd_pcm_proc_init(void) |
1109 | { |
1110 | struct snd_info_entry *entry; |
1111 | |
1112 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { |
1113 | snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); |
1114 | if (snd_info_register(entry) < 0) { |
1115 | snd_info_free_entry(entry); |
1116 | entry = NULL; |
1117 | } |
1118 | } |
1119 | snd_pcm_proc_entry = entry; |
1120 | } |
1121 | |
1122 | static void snd_pcm_proc_done(void) |
1123 | { |
1124 | snd_info_free_entry(snd_pcm_proc_entry); |
1125 | } |
1126 | |
1127 | #else /* !CONFIG_PROC_FS */ |
1128 | #define snd_pcm_proc_init() |
1129 | #define snd_pcm_proc_done() |
1130 | #endif /* CONFIG_PROC_FS */ |
1131 | |
1132 | |
1133 | /* |
1134 | * ENTRY functions |
1135 | */ |
1136 | |
1137 | static int __init alsa_pcm_init(void) |
1138 | { |
1139 | snd_ctl_register_ioctl(snd_pcm_control_ioctl); |
1140 | snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); |
1141 | snd_pcm_proc_init(); |
1142 | return 0; |
1143 | } |
1144 | |
1145 | static void __exit alsa_pcm_exit(void) |
1146 | { |
1147 | snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); |
1148 | snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); |
1149 | snd_pcm_proc_done(); |
1150 | } |
1151 | |
1152 | module_init(alsa_pcm_init) |
1153 | module_exit(alsa_pcm_exit) |
1154 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9