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
snd_pcm_get(struct snd_card * card,int device)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->internal)
53 continue;
54 if (pcm->card == card && pcm->device == device)
55 return pcm;
56 }
57 return NULL;
58 }
59
snd_pcm_next(struct snd_card * card,int device)60 static int snd_pcm_next(struct snd_card *card, int device)
61 {
62 struct snd_pcm *pcm;
63
64 list_for_each_entry(pcm, &snd_pcm_devices, list) {
65 if (pcm->internal)
66 continue;
67 if (pcm->card == card && pcm->device > device)
68 return pcm->device;
69 else if (pcm->card->number > card->number)
70 return -1;
71 }
72 return -1;
73 }
74
snd_pcm_add(struct snd_pcm * newpcm)75 static int snd_pcm_add(struct snd_pcm *newpcm)
76 {
77 struct snd_pcm *pcm;
78
79 list_for_each_entry(pcm, &snd_pcm_devices, list) {
80 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
81 return -EBUSY;
82 if (pcm->card->number > newpcm->card->number ||
83 (pcm->card == newpcm->card &&
84 pcm->device > newpcm->device)) {
85 list_add(&newpcm->list, pcm->list.prev);
86 return 0;
87 }
88 }
89 list_add_tail(&newpcm->list, &snd_pcm_devices);
90 return 0;
91 }
92
snd_pcm_control_ioctl(struct snd_card * card,struct snd_ctl_file * control,unsigned int cmd,unsigned long arg)93 static int snd_pcm_control_ioctl(struct snd_card *card,
94 struct snd_ctl_file *control,
95 unsigned int cmd, unsigned long arg)
96 {
97 switch (cmd) {
98 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
99 {
100 int device;
101
102 if (get_user(device, (int __user *)arg))
103 return -EFAULT;
104 mutex_lock(®ister_mutex);
105 device = snd_pcm_next(card, device);
106 mutex_unlock(®ister_mutex);
107 if (put_user(device, (int __user *)arg))
108 return -EFAULT;
109 return 0;
110 }
111 case SNDRV_CTL_IOCTL_PCM_INFO:
112 {
113 struct snd_pcm_info __user *info;
114 unsigned int device, subdevice;
115 int stream;
116 struct snd_pcm *pcm;
117 struct snd_pcm_str *pstr;
118 struct snd_pcm_substream *substream;
119 int err;
120
121 info = (struct snd_pcm_info __user *)arg;
122 if (get_user(device, &info->device))
123 return -EFAULT;
124 if (get_user(stream, &info->stream))
125 return -EFAULT;
126 if (stream < 0 || stream > 1)
127 return -EINVAL;
128 if (get_user(subdevice, &info->subdevice))
129 return -EFAULT;
130 mutex_lock(®ister_mutex);
131 pcm = snd_pcm_get(card, device);
132 if (pcm == NULL) {
133 err = -ENXIO;
134 goto _error;
135 }
136 pstr = &pcm->streams[stream];
137 if (pstr->substream_count == 0) {
138 err = -ENOENT;
139 goto _error;
140 }
141 if (subdevice >= pstr->substream_count) {
142 err = -ENXIO;
143 goto _error;
144 }
145 for (substream = pstr->substream; substream;
146 substream = substream->next)
147 if (substream->number == (int)subdevice)
148 break;
149 if (substream == NULL) {
150 err = -ENXIO;
151 goto _error;
152 }
153 err = snd_pcm_info_user(substream, info);
154 _error:
155 mutex_unlock(®ister_mutex);
156 return err;
157 }
158 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
159 {
160 int val;
161
162 if (get_user(val, (int __user *)arg))
163 return -EFAULT;
164 control->prefer_pcm_subdevice = val;
165 return 0;
166 }
167 }
168 return -ENOIOCTLCMD;
169 }
170
171 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
172
173 static char *snd_pcm_format_names[] = {
174 FORMAT(S8),
175 FORMAT(U8),
176 FORMAT(S16_LE),
177 FORMAT(S16_BE),
178 FORMAT(U16_LE),
179 FORMAT(U16_BE),
180 FORMAT(S24_LE),
181 FORMAT(S24_BE),
182 FORMAT(U24_LE),
183 FORMAT(U24_BE),
184 FORMAT(S32_LE),
185 FORMAT(S32_BE),
186 FORMAT(U32_LE),
187 FORMAT(U32_BE),
188 FORMAT(FLOAT_LE),
189 FORMAT(FLOAT_BE),
190 FORMAT(FLOAT64_LE),
191 FORMAT(FLOAT64_BE),
192 FORMAT(IEC958_SUBFRAME_LE),
193 FORMAT(IEC958_SUBFRAME_BE),
194 FORMAT(MU_LAW),
195 FORMAT(A_LAW),
196 FORMAT(IMA_ADPCM),
197 FORMAT(MPEG),
198 FORMAT(GSM),
199 FORMAT(SPECIAL),
200 FORMAT(S24_3LE),
201 FORMAT(S24_3BE),
202 FORMAT(U24_3LE),
203 FORMAT(U24_3BE),
204 FORMAT(S20_3LE),
205 FORMAT(S20_3BE),
206 FORMAT(U20_3LE),
207 FORMAT(U20_3BE),
208 FORMAT(S18_3LE),
209 FORMAT(S18_3BE),
210 FORMAT(U18_3LE),
211 FORMAT(U18_3BE),
212 FORMAT(G723_24),
213 FORMAT(G723_24_1B),
214 FORMAT(G723_40),
215 FORMAT(G723_40_1B),
216 };
217
snd_pcm_format_name(snd_pcm_format_t format)218 const char *snd_pcm_format_name(snd_pcm_format_t format)
219 {
220 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
221 return "Unknown";
222 return snd_pcm_format_names[(__force unsigned int)format];
223 }
224 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
225
226 #ifdef CONFIG_SND_VERBOSE_PROCFS
227
228 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
229 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
230 #define READY(v) [SNDRV_PCM_READY_##v] = #v
231 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
232 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
233 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
234 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
235 #define START(v) [SNDRV_PCM_START_##v] = #v
236 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
237
238 static char *snd_pcm_stream_names[] = {
239 STREAM(PLAYBACK),
240 STREAM(CAPTURE),
241 };
242
243 static char *snd_pcm_state_names[] = {
244 STATE(OPEN),
245 STATE(SETUP),
246 STATE(PREPARED),
247 STATE(RUNNING),
248 STATE(XRUN),
249 STATE(DRAINING),
250 STATE(PAUSED),
251 STATE(SUSPENDED),
252 };
253
254 static char *snd_pcm_access_names[] = {
255 ACCESS(MMAP_INTERLEAVED),
256 ACCESS(MMAP_NONINTERLEAVED),
257 ACCESS(MMAP_COMPLEX),
258 ACCESS(RW_INTERLEAVED),
259 ACCESS(RW_NONINTERLEAVED),
260 };
261
262 static char *snd_pcm_subformat_names[] = {
263 SUBFORMAT(STD),
264 };
265
266 static char *snd_pcm_tstamp_mode_names[] = {
267 TSTAMP(NONE),
268 TSTAMP(ENABLE),
269 };
270
snd_pcm_stream_name(int stream)271 static const char *snd_pcm_stream_name(int stream)
272 {
273 return snd_pcm_stream_names[stream];
274 }
275
snd_pcm_access_name(snd_pcm_access_t access)276 static const char *snd_pcm_access_name(snd_pcm_access_t access)
277 {
278 return snd_pcm_access_names[(__force int)access];
279 }
280
snd_pcm_subformat_name(snd_pcm_subformat_t subformat)281 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
282 {
283 return snd_pcm_subformat_names[(__force int)subformat];
284 }
285
snd_pcm_tstamp_mode_name(int mode)286 static const char *snd_pcm_tstamp_mode_name(int mode)
287 {
288 return snd_pcm_tstamp_mode_names[mode];
289 }
290
snd_pcm_state_name(snd_pcm_state_t state)291 static const char *snd_pcm_state_name(snd_pcm_state_t state)
292 {
293 return snd_pcm_state_names[(__force int)state];
294 }
295
296 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
297 #include <linux/soundcard.h>
298
snd_pcm_oss_format_name(int format)299 static const char *snd_pcm_oss_format_name(int format)
300 {
301 switch (format) {
302 case AFMT_MU_LAW:
303 return "MU_LAW";
304 case AFMT_A_LAW:
305 return "A_LAW";
306 case AFMT_IMA_ADPCM:
307 return "IMA_ADPCM";
308 case AFMT_U8:
309 return "U8";
310 case AFMT_S16_LE:
311 return "S16_LE";
312 case AFMT_S16_BE:
313 return "S16_BE";
314 case AFMT_S8:
315 return "S8";
316 case AFMT_U16_LE:
317 return "U16_LE";
318 case AFMT_U16_BE:
319 return "U16_BE";
320 case AFMT_MPEG:
321 return "MPEG";
322 default:
323 return "unknown";
324 }
325 }
326 #endif
327
snd_pcm_proc_info_read(struct snd_pcm_substream * substream,struct snd_info_buffer * buffer)328 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
329 struct snd_info_buffer *buffer)
330 {
331 struct snd_pcm_info *info;
332 int err;
333
334 if (! substream)
335 return;
336
337 info = kmalloc(sizeof(*info), GFP_KERNEL);
338 if (! info) {
339 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
340 return;
341 }
342
343 err = snd_pcm_info(substream, info);
344 if (err < 0) {
345 snd_iprintf(buffer, "error %d\n", err);
346 kfree(info);
347 return;
348 }
349 snd_iprintf(buffer, "card: %d\n", info->card);
350 snd_iprintf(buffer, "device: %d\n", info->device);
351 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
352 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
353 snd_iprintf(buffer, "id: %s\n", info->id);
354 snd_iprintf(buffer, "name: %s\n", info->name);
355 snd_iprintf(buffer, "subname: %s\n", info->subname);
356 snd_iprintf(buffer, "class: %d\n", info->dev_class);
357 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
358 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
359 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
360 kfree(info);
361 }
362
snd_pcm_stream_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)363 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
364 struct snd_info_buffer *buffer)
365 {
366 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
367 buffer);
368 }
369
snd_pcm_substream_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)370 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
371 struct snd_info_buffer *buffer)
372 {
373 snd_pcm_proc_info_read(entry->private_data, buffer);
374 }
375
snd_pcm_substream_proc_hw_params_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)376 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378 {
379 struct snd_pcm_substream *substream = entry->private_data;
380 struct snd_pcm_runtime *runtime;
381
382 mutex_lock(&substream->pcm->open_mutex);
383 runtime = substream->runtime;
384 if (!runtime) {
385 snd_iprintf(buffer, "closed\n");
386 goto unlock;
387 }
388 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
389 snd_iprintf(buffer, "no setup\n");
390 goto unlock;
391 }
392 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
393 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
394 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
395 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
396 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
397 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
398 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
399 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
400 if (substream->oss.oss) {
401 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
402 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
403 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
404 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
405 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
406 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
407 }
408 #endif
409 unlock:
410 mutex_unlock(&substream->pcm->open_mutex);
411 }
412
snd_pcm_substream_proc_sw_params_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)413 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
414 struct snd_info_buffer *buffer)
415 {
416 struct snd_pcm_substream *substream = entry->private_data;
417 struct snd_pcm_runtime *runtime;
418
419 mutex_lock(&substream->pcm->open_mutex);
420 runtime = substream->runtime;
421 if (!runtime) {
422 snd_iprintf(buffer, "closed\n");
423 goto unlock;
424 }
425 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
426 snd_iprintf(buffer, "no setup\n");
427 goto unlock;
428 }
429 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
430 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
431 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
432 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
433 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
434 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
435 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
436 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
437 unlock:
438 mutex_unlock(&substream->pcm->open_mutex);
439 }
440
snd_pcm_substream_proc_status_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)441 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
442 struct snd_info_buffer *buffer)
443 {
444 struct snd_pcm_substream *substream = entry->private_data;
445 struct snd_pcm_runtime *runtime;
446 struct snd_pcm_status status;
447 int err;
448
449 mutex_lock(&substream->pcm->open_mutex);
450 runtime = substream->runtime;
451 if (!runtime) {
452 snd_iprintf(buffer, "closed\n");
453 goto unlock;
454 }
455 memset(&status, 0, sizeof(status));
456 err = snd_pcm_status(substream, &status);
457 if (err < 0) {
458 snd_iprintf(buffer, "error %d\n", err);
459 goto unlock;
460 }
461 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
462 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
463 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
464 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
465 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
466 status.tstamp.tv_sec, status.tstamp.tv_nsec);
467 snd_iprintf(buffer, "delay : %ld\n", status.delay);
468 snd_iprintf(buffer, "avail : %ld\n", status.avail);
469 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
470 snd_iprintf(buffer, "-----\n");
471 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
472 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
473 unlock:
474 mutex_unlock(&substream->pcm->open_mutex);
475 }
476
477 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
snd_pcm_xrun_debug_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)478 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
479 struct snd_info_buffer *buffer)
480 {
481 struct snd_pcm_str *pstr = entry->private_data;
482 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
483 }
484
snd_pcm_xrun_debug_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)485 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
486 struct snd_info_buffer *buffer)
487 {
488 struct snd_pcm_str *pstr = entry->private_data;
489 char line[64];
490 if (!snd_info_get_line(buffer, line, sizeof(line)))
491 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
492 }
493 #endif
494
snd_pcm_stream_proc_init(struct snd_pcm_str * pstr)495 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
496 {
497 struct snd_pcm *pcm = pstr->pcm;
498 struct snd_info_entry *entry;
499 char name[16];
500
501 sprintf(name, "pcm%i%c", pcm->device,
502 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
503 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
504 return -ENOMEM;
505 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
506 if (snd_info_register(entry) < 0) {
507 snd_info_free_entry(entry);
508 return -ENOMEM;
509 }
510 pstr->proc_root = entry;
511
512 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
513 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
514 if (snd_info_register(entry) < 0) {
515 snd_info_free_entry(entry);
516 entry = NULL;
517 }
518 }
519 pstr->proc_info_entry = entry;
520
521 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
522 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
523 pstr->proc_root)) != NULL) {
524 entry->c.text.read = snd_pcm_xrun_debug_read;
525 entry->c.text.write = snd_pcm_xrun_debug_write;
526 entry->mode |= S_IWUSR;
527 entry->private_data = pstr;
528 if (snd_info_register(entry) < 0) {
529 snd_info_free_entry(entry);
530 entry = NULL;
531 }
532 }
533 pstr->proc_xrun_debug_entry = entry;
534 #endif
535 return 0;
536 }
537
snd_pcm_stream_proc_done(struct snd_pcm_str * pstr)538 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
539 {
540 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
541 snd_info_free_entry(pstr->proc_xrun_debug_entry);
542 pstr->proc_xrun_debug_entry = NULL;
543 #endif
544 snd_info_free_entry(pstr->proc_info_entry);
545 pstr->proc_info_entry = NULL;
546 snd_info_free_entry(pstr->proc_root);
547 pstr->proc_root = NULL;
548 return 0;
549 }
550
snd_pcm_substream_proc_init(struct snd_pcm_substream * substream)551 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
552 {
553 struct snd_info_entry *entry;
554 struct snd_card *card;
555 char name[16];
556
557 card = substream->pcm->card;
558
559 sprintf(name, "sub%i", substream->number);
560 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
561 return -ENOMEM;
562 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
563 if (snd_info_register(entry) < 0) {
564 snd_info_free_entry(entry);
565 return -ENOMEM;
566 }
567 substream->proc_root = entry;
568
569 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
570 snd_info_set_text_ops(entry, substream,
571 snd_pcm_substream_proc_info_read);
572 if (snd_info_register(entry) < 0) {
573 snd_info_free_entry(entry);
574 entry = NULL;
575 }
576 }
577 substream->proc_info_entry = entry;
578
579 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
580 snd_info_set_text_ops(entry, substream,
581 snd_pcm_substream_proc_hw_params_read);
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 entry = NULL;
585 }
586 }
587 substream->proc_hw_params_entry = entry;
588
589 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
590 snd_info_set_text_ops(entry, substream,
591 snd_pcm_substream_proc_sw_params_read);
592 if (snd_info_register(entry) < 0) {
593 snd_info_free_entry(entry);
594 entry = NULL;
595 }
596 }
597 substream->proc_sw_params_entry = entry;
598
599 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
600 snd_info_set_text_ops(entry, substream,
601 snd_pcm_substream_proc_status_read);
602 if (snd_info_register(entry) < 0) {
603 snd_info_free_entry(entry);
604 entry = NULL;
605 }
606 }
607 substream->proc_status_entry = entry;
608
609 return 0;
610 }
611
snd_pcm_substream_proc_done(struct snd_pcm_substream * substream)612 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
613 {
614 snd_info_free_entry(substream->proc_info_entry);
615 substream->proc_info_entry = NULL;
616 snd_info_free_entry(substream->proc_hw_params_entry);
617 substream->proc_hw_params_entry = NULL;
618 snd_info_free_entry(substream->proc_sw_params_entry);
619 substream->proc_sw_params_entry = NULL;
620 snd_info_free_entry(substream->proc_status_entry);
621 substream->proc_status_entry = NULL;
622 snd_info_free_entry(substream->proc_root);
623 substream->proc_root = NULL;
624 return 0;
625 }
626 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_stream_proc_init(struct snd_pcm_str * pstr)627 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
snd_pcm_stream_proc_done(struct snd_pcm_str * pstr)628 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
snd_pcm_substream_proc_init(struct snd_pcm_substream * substream)629 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
snd_pcm_substream_proc_done(struct snd_pcm_substream * substream)630 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
631 #endif /* CONFIG_SND_VERBOSE_PROCFS */
632
633 /**
634 * snd_pcm_new_stream - create a new PCM stream
635 * @pcm: the pcm instance
636 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
637 * @substream_count: the number of substreams
638 *
639 * Creates a new stream for the pcm.
640 * The corresponding stream on the pcm must have been empty before
641 * calling this, i.e. zero must be given to the argument of
642 * snd_pcm_new().
643 *
644 * Returns zero if successful, or a negative error code on failure.
645 */
snd_pcm_new_stream(struct snd_pcm * pcm,int stream,int substream_count)646 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
647 {
648 int idx, err;
649 struct snd_pcm_str *pstr = &pcm->streams[stream];
650 struct snd_pcm_substream *substream, *prev;
651
652 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
653 mutex_init(&pstr->oss.setup_mutex);
654 #endif
655 pstr->stream = stream;
656 pstr->pcm = pcm;
657 pstr->substream_count = substream_count;
658 if (substream_count > 0 && !pcm->internal) {
659 err = snd_pcm_stream_proc_init(pstr);
660 if (err < 0) {
661 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
662 return err;
663 }
664 }
665 prev = NULL;
666 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
667 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
668 if (substream == NULL) {
669 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
670 return -ENOMEM;
671 }
672 substream->pcm = pcm;
673 substream->pstr = pstr;
674 substream->number = idx;
675 substream->stream = stream;
676 sprintf(substream->name, "subdevice #%i", idx);
677 substream->buffer_bytes_max = UINT_MAX;
678 if (prev == NULL)
679 pstr->substream = substream;
680 else
681 prev->next = substream;
682
683 if (!pcm->internal) {
684 err = snd_pcm_substream_proc_init(substream);
685 if (err < 0) {
686 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
687 if (prev == NULL)
688 pstr->substream = NULL;
689 else
690 prev->next = NULL;
691 kfree(substream);
692 return err;
693 }
694 }
695 substream->group = &substream->self_group;
696 spin_lock_init(&substream->self_group.lock);
697 INIT_LIST_HEAD(&substream->self_group.substreams);
698 list_add_tail(&substream->link_list, &substream->self_group.substreams);
699 atomic_set(&substream->mmap_count, 0);
700 prev = substream;
701 }
702 return 0;
703 }
704
705 EXPORT_SYMBOL(snd_pcm_new_stream);
706
_snd_pcm_new(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,bool internal,struct snd_pcm ** rpcm)707 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
708 int playback_count, int capture_count, bool internal,
709 struct snd_pcm **rpcm)
710 {
711 struct snd_pcm *pcm;
712 int err;
713 static struct snd_device_ops ops = {
714 .dev_free = snd_pcm_dev_free,
715 .dev_register = snd_pcm_dev_register,
716 .dev_disconnect = snd_pcm_dev_disconnect,
717 };
718
719 if (snd_BUG_ON(!card))
720 return -ENXIO;
721 if (rpcm)
722 *rpcm = NULL;
723 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
724 if (pcm == NULL) {
725 snd_printk(KERN_ERR "Cannot allocate PCM\n");
726 return -ENOMEM;
727 }
728 pcm->card = card;
729 pcm->device = device;
730 pcm->internal = internal;
731 if (id)
732 strlcpy(pcm->id, id, sizeof(pcm->id));
733 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
734 snd_pcm_free(pcm);
735 return err;
736 }
737 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
738 snd_pcm_free(pcm);
739 return err;
740 }
741 mutex_init(&pcm->open_mutex);
742 init_waitqueue_head(&pcm->open_wait);
743 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
744 snd_pcm_free(pcm);
745 return err;
746 }
747 if (rpcm)
748 *rpcm = pcm;
749 return 0;
750 }
751
752 /**
753 * snd_pcm_new - create a new PCM instance
754 * @card: the card instance
755 * @id: the id string
756 * @device: the device index (zero based)
757 * @playback_count: the number of substreams for playback
758 * @capture_count: the number of substreams for capture
759 * @rpcm: the pointer to store the new pcm instance
760 *
761 * Creates a new PCM instance.
762 *
763 * The pcm operators have to be set afterwards to the new instance
764 * via snd_pcm_set_ops().
765 *
766 * Returns zero if successful, or a negative error code on failure.
767 */
snd_pcm_new(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,struct snd_pcm ** rpcm)768 int snd_pcm_new(struct snd_card *card, const char *id, int device,
769 int playback_count, int capture_count, struct snd_pcm **rpcm)
770 {
771 return _snd_pcm_new(card, id, device, playback_count, capture_count,
772 false, rpcm);
773 }
774 EXPORT_SYMBOL(snd_pcm_new);
775
776 /**
777 * snd_pcm_new_internal - create a new internal PCM instance
778 * @card: the card instance
779 * @id: the id string
780 * @device: the device index (zero based - shared with normal PCMs)
781 * @playback_count: the number of substreams for playback
782 * @capture_count: the number of substreams for capture
783 * @rpcm: the pointer to store the new pcm instance
784 *
785 * Creates a new internal PCM instance with no userspace device or procfs
786 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
787 * will only be used internally by kernel drivers. i.e. it cannot be opened
788 * by userspace. It provides existing ASoC components drivers with a substream
789 * and access to any private data.
790 *
791 * The pcm operators have to be set afterwards to the new instance
792 * via snd_pcm_set_ops().
793 *
794 * Returns zero if successful, or a negative error code on failure.
795 */
snd_pcm_new_internal(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,struct snd_pcm ** rpcm)796 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
797 int playback_count, int capture_count,
798 struct snd_pcm **rpcm)
799 {
800 return _snd_pcm_new(card, id, device, playback_count, capture_count,
801 true, rpcm);
802 }
803 EXPORT_SYMBOL(snd_pcm_new_internal);
804
snd_pcm_free_stream(struct snd_pcm_str * pstr)805 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
806 {
807 struct snd_pcm_substream *substream, *substream_next;
808 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
809 struct snd_pcm_oss_setup *setup, *setupn;
810 #endif
811 substream = pstr->substream;
812 while (substream) {
813 substream_next = substream->next;
814 snd_pcm_timer_done(substream);
815 snd_pcm_substream_proc_done(substream);
816 kfree(substream);
817 substream = substream_next;
818 }
819 snd_pcm_stream_proc_done(pstr);
820 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
821 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
822 setupn = setup->next;
823 kfree(setup->task_name);
824 kfree(setup);
825 }
826 #endif
827 }
828
snd_pcm_free(struct snd_pcm * pcm)829 static int snd_pcm_free(struct snd_pcm *pcm)
830 {
831 struct snd_pcm_notify *notify;
832
833 if (!pcm)
834 return 0;
835 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
836 notify->n_unregister(pcm);
837 }
838 if (pcm->private_free)
839 pcm->private_free(pcm);
840 snd_pcm_lib_preallocate_free_for_all(pcm);
841 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
842 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
843 kfree(pcm);
844 return 0;
845 }
846
snd_pcm_dev_free(struct snd_device * device)847 static int snd_pcm_dev_free(struct snd_device *device)
848 {
849 struct snd_pcm *pcm = device->device_data;
850 return snd_pcm_free(pcm);
851 }
852
snd_pcm_attach_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)853 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
854 struct file *file,
855 struct snd_pcm_substream **rsubstream)
856 {
857 struct snd_pcm_str * pstr;
858 struct snd_pcm_substream *substream;
859 struct snd_pcm_runtime *runtime;
860 struct snd_ctl_file *kctl;
861 struct snd_card *card;
862 int prefer_subdevice = -1;
863 size_t size;
864
865 if (snd_BUG_ON(!pcm || !rsubstream))
866 return -ENXIO;
867 *rsubstream = NULL;
868 pstr = &pcm->streams[stream];
869 if (pstr->substream == NULL || pstr->substream_count == 0)
870 return -ENODEV;
871
872 card = pcm->card;
873 read_lock(&card->ctl_files_rwlock);
874 list_for_each_entry(kctl, &card->ctl_files, list) {
875 if (kctl->pid == task_pid(current)) {
876 prefer_subdevice = kctl->prefer_pcm_subdevice;
877 if (prefer_subdevice != -1)
878 break;
879 }
880 }
881 read_unlock(&card->ctl_files_rwlock);
882
883 switch (stream) {
884 case SNDRV_PCM_STREAM_PLAYBACK:
885 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
886 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
887 if (SUBSTREAM_BUSY(substream))
888 return -EAGAIN;
889 }
890 }
891 break;
892 case SNDRV_PCM_STREAM_CAPTURE:
893 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
894 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
895 if (SUBSTREAM_BUSY(substream))
896 return -EAGAIN;
897 }
898 }
899 break;
900 default:
901 return -EINVAL;
902 }
903
904 if (file->f_flags & O_APPEND) {
905 if (prefer_subdevice < 0) {
906 if (pstr->substream_count > 1)
907 return -EINVAL; /* must be unique */
908 substream = pstr->substream;
909 } else {
910 for (substream = pstr->substream; substream;
911 substream = substream->next)
912 if (substream->number == prefer_subdevice)
913 break;
914 }
915 if (! substream)
916 return -ENODEV;
917 if (! SUBSTREAM_BUSY(substream))
918 return -EBADFD;
919 substream->ref_count++;
920 *rsubstream = substream;
921 return 0;
922 }
923
924 if (prefer_subdevice >= 0) {
925 for (substream = pstr->substream; substream; substream = substream->next)
926 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
927 goto __ok;
928 }
929 for (substream = pstr->substream; substream; substream = substream->next)
930 if (!SUBSTREAM_BUSY(substream))
931 break;
932 __ok:
933 if (substream == NULL)
934 return -EAGAIN;
935
936 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
937 if (runtime == NULL)
938 return -ENOMEM;
939
940 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
941 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
942 if (runtime->status == NULL) {
943 kfree(runtime);
944 return -ENOMEM;
945 }
946 memset((void*)runtime->status, 0, size);
947
948 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
949 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
950 if (runtime->control == NULL) {
951 snd_free_pages((void*)runtime->status,
952 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
953 kfree(runtime);
954 return -ENOMEM;
955 }
956 memset((void*)runtime->control, 0, size);
957
958 init_waitqueue_head(&runtime->sleep);
959 init_waitqueue_head(&runtime->tsleep);
960
961 runtime->status->state = SNDRV_PCM_STATE_OPEN;
962
963 substream->runtime = runtime;
964 substream->private_data = pcm->private_data;
965 substream->ref_count = 1;
966 substream->f_flags = file->f_flags;
967 substream->pid = get_pid(task_pid(current));
968 pstr->substream_opened++;
969 *rsubstream = substream;
970 return 0;
971 }
972
snd_pcm_detach_substream(struct snd_pcm_substream * substream)973 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
974 {
975 struct snd_pcm_runtime *runtime;
976
977 if (PCM_RUNTIME_CHECK(substream))
978 return;
979 runtime = substream->runtime;
980 if (runtime->private_free != NULL)
981 runtime->private_free(runtime);
982 snd_free_pages((void*)runtime->status,
983 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
984 snd_free_pages((void*)runtime->control,
985 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
986 kfree(runtime->hw_constraints.rules);
987 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
988 if (runtime->hwptr_log)
989 kfree(runtime->hwptr_log);
990 #endif
991 kfree(runtime);
992 substream->runtime = NULL;
993 put_pid(substream->pid);
994 substream->pid = NULL;
995 substream->pstr->substream_opened--;
996 }
997
show_pcm_class(struct device * dev,struct device_attribute * attr,char * buf)998 static ssize_t show_pcm_class(struct device *dev,
999 struct device_attribute *attr, char *buf)
1000 {
1001 struct snd_pcm *pcm;
1002 const char *str;
1003 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1004 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1005 [SNDRV_PCM_CLASS_MULTI] = "multi",
1006 [SNDRV_PCM_CLASS_MODEM] = "modem",
1007 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1008 };
1009
1010 if (! (pcm = dev_get_drvdata(dev)) ||
1011 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1012 str = "none";
1013 else
1014 str = strs[pcm->dev_class];
1015 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1016 }
1017
1018 static struct device_attribute pcm_attrs =
1019 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1020
snd_pcm_dev_register(struct snd_device * device)1021 static int snd_pcm_dev_register(struct snd_device *device)
1022 {
1023 int cidx, err;
1024 struct snd_pcm_substream *substream;
1025 struct snd_pcm_notify *notify;
1026 char str[16];
1027 struct snd_pcm *pcm;
1028 struct device *dev;
1029
1030 if (snd_BUG_ON(!device || !device->device_data))
1031 return -ENXIO;
1032 pcm = device->device_data;
1033 mutex_lock(®ister_mutex);
1034 err = snd_pcm_add(pcm);
1035 if (err) {
1036 mutex_unlock(®ister_mutex);
1037 return err;
1038 }
1039 for (cidx = 0; cidx < 2; cidx++) {
1040 int devtype = -1;
1041 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1042 continue;
1043 switch (cidx) {
1044 case SNDRV_PCM_STREAM_PLAYBACK:
1045 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1046 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1047 break;
1048 case SNDRV_PCM_STREAM_CAPTURE:
1049 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1050 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1051 break;
1052 }
1053 /* device pointer to use, pcm->dev takes precedence if
1054 * it is assigned, otherwise fall back to card's device
1055 * if possible */
1056 dev = pcm->dev;
1057 if (!dev)
1058 dev = snd_card_get_device_link(pcm->card);
1059 /* register pcm */
1060 err = snd_register_device_for_dev(devtype, pcm->card,
1061 pcm->device,
1062 &snd_pcm_f_ops[cidx],
1063 pcm, str, dev);
1064 if (err < 0) {
1065 list_del(&pcm->list);
1066 mutex_unlock(®ister_mutex);
1067 return err;
1068 }
1069 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1070 &pcm_attrs);
1071 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1072 snd_pcm_timer_init(substream);
1073 }
1074
1075 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1076 notify->n_register(pcm);
1077
1078 mutex_unlock(®ister_mutex);
1079 return 0;
1080 }
1081
snd_pcm_dev_disconnect(struct snd_device * device)1082 static int snd_pcm_dev_disconnect(struct snd_device *device)
1083 {
1084 struct snd_pcm *pcm = device->device_data;
1085 struct snd_pcm_notify *notify;
1086 struct snd_pcm_substream *substream;
1087 int cidx, devtype;
1088
1089 mutex_lock(®ister_mutex);
1090 if (list_empty(&pcm->list))
1091 goto unlock;
1092
1093 mutex_lock(&pcm->open_mutex);
1094 wake_up(&pcm->open_wait);
1095 list_del_init(&pcm->list);
1096 for (cidx = 0; cidx < 2; cidx++)
1097 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1098 snd_pcm_stream_lock_irq(substream);
1099 if (substream->runtime) {
1100 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1101 wake_up(&substream->runtime->sleep);
1102 wake_up(&substream->runtime->tsleep);
1103 }
1104 snd_pcm_stream_unlock_irq(substream);
1105 }
1106 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1107 notify->n_disconnect(pcm);
1108 }
1109 for (cidx = 0; cidx < 2; cidx++) {
1110 devtype = -1;
1111 switch (cidx) {
1112 case SNDRV_PCM_STREAM_PLAYBACK:
1113 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1114 break;
1115 case SNDRV_PCM_STREAM_CAPTURE:
1116 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1117 break;
1118 }
1119 snd_unregister_device(devtype, pcm->card, pcm->device);
1120 }
1121 mutex_unlock(&pcm->open_mutex);
1122 unlock:
1123 mutex_unlock(®ister_mutex);
1124 return 0;
1125 }
1126
snd_pcm_notify(struct snd_pcm_notify * notify,int nfree)1127 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1128 {
1129 struct snd_pcm *pcm;
1130
1131 if (snd_BUG_ON(!notify ||
1132 !notify->n_register ||
1133 !notify->n_unregister ||
1134 !notify->n_disconnect))
1135 return -EINVAL;
1136 mutex_lock(®ister_mutex);
1137 if (nfree) {
1138 list_del(¬ify->list);
1139 list_for_each_entry(pcm, &snd_pcm_devices, list)
1140 notify->n_unregister(pcm);
1141 } else {
1142 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1143 list_for_each_entry(pcm, &snd_pcm_devices, list)
1144 notify->n_register(pcm);
1145 }
1146 mutex_unlock(®ister_mutex);
1147 return 0;
1148 }
1149
1150 EXPORT_SYMBOL(snd_pcm_notify);
1151
1152 #ifdef CONFIG_PROC_FS
1153 /*
1154 * Info interface
1155 */
1156
snd_pcm_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1157 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1158 struct snd_info_buffer *buffer)
1159 {
1160 struct snd_pcm *pcm;
1161
1162 mutex_lock(®ister_mutex);
1163 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1164 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1165 pcm->card->number, pcm->device, pcm->id, pcm->name);
1166 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1167 snd_iprintf(buffer, " : playback %i",
1168 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1169 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1170 snd_iprintf(buffer, " : capture %i",
1171 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1172 snd_iprintf(buffer, "\n");
1173 }
1174 mutex_unlock(®ister_mutex);
1175 }
1176
1177 static struct snd_info_entry *snd_pcm_proc_entry;
1178
snd_pcm_proc_init(void)1179 static void snd_pcm_proc_init(void)
1180 {
1181 struct snd_info_entry *entry;
1182
1183 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1184 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1185 if (snd_info_register(entry) < 0) {
1186 snd_info_free_entry(entry);
1187 entry = NULL;
1188 }
1189 }
1190 snd_pcm_proc_entry = entry;
1191 }
1192
snd_pcm_proc_done(void)1193 static void snd_pcm_proc_done(void)
1194 {
1195 snd_info_free_entry(snd_pcm_proc_entry);
1196 }
1197
1198 #else /* !CONFIG_PROC_FS */
1199 #define snd_pcm_proc_init()
1200 #define snd_pcm_proc_done()
1201 #endif /* CONFIG_PROC_FS */
1202
1203
1204 /*
1205 * ENTRY functions
1206 */
1207
alsa_pcm_init(void)1208 static int __init alsa_pcm_init(void)
1209 {
1210 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1211 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1212 snd_pcm_proc_init();
1213 return 0;
1214 }
1215
alsa_pcm_exit(void)1216 static void __exit alsa_pcm_exit(void)
1217 {
1218 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1219 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1220 snd_pcm_proc_done();
1221 }
1222
1223 module_init(alsa_pcm_init)
1224 module_exit(alsa_pcm_exit)
1225