1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/time.h>
11 #include <linux/mutex.h>
12 #include <linux/device.h>
13 #include <linux/nospec.h>
14 #include <sound/core.h>
15 #include <sound/minors.h>
16 #include <sound/pcm.h>
17 #include <sound/timer.h>
18 #include <sound/control.h>
19 #include <sound/info.h>
20
21 #include "pcm_local.h"
22
23 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
24 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
25 MODULE_LICENSE("GPL");
26
27 static LIST_HEAD(snd_pcm_devices);
28 static DEFINE_MUTEX(register_mutex);
29 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
30 static LIST_HEAD(snd_pcm_notify_list);
31 #endif
32
33 static int snd_pcm_free(struct snd_pcm *pcm);
34 static int snd_pcm_dev_free(struct snd_device *device);
35 static int snd_pcm_dev_register(struct snd_device *device);
36 static int snd_pcm_dev_disconnect(struct snd_device *device);
37
snd_pcm_get(struct snd_card * card,int device)38 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
39 {
40 struct snd_pcm *pcm;
41
42 list_for_each_entry(pcm, &snd_pcm_devices, list) {
43 if (pcm->card == card && pcm->device == device)
44 return pcm;
45 }
46 return NULL;
47 }
48
snd_pcm_next(struct snd_card * card,int device)49 static int snd_pcm_next(struct snd_card *card, int device)
50 {
51 struct snd_pcm *pcm;
52
53 list_for_each_entry(pcm, &snd_pcm_devices, list) {
54 if (pcm->card == card && pcm->device > device)
55 return pcm->device;
56 else if (pcm->card->number > card->number)
57 return -1;
58 }
59 return -1;
60 }
61
snd_pcm_add(struct snd_pcm * newpcm)62 static int snd_pcm_add(struct snd_pcm *newpcm)
63 {
64 struct snd_pcm *pcm;
65
66 if (newpcm->internal)
67 return 0;
68
69 list_for_each_entry(pcm, &snd_pcm_devices, list) {
70 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
71 return -EBUSY;
72 if (pcm->card->number > newpcm->card->number ||
73 (pcm->card == newpcm->card &&
74 pcm->device > newpcm->device)) {
75 list_add(&newpcm->list, pcm->list.prev);
76 return 0;
77 }
78 }
79 list_add_tail(&newpcm->list, &snd_pcm_devices);
80 return 0;
81 }
82
snd_pcm_control_ioctl(struct snd_card * card,struct snd_ctl_file * control,unsigned int cmd,unsigned long arg)83 static int snd_pcm_control_ioctl(struct snd_card *card,
84 struct snd_ctl_file *control,
85 unsigned int cmd, unsigned long arg)
86 {
87 switch (cmd) {
88 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
89 {
90 int device;
91
92 if (get_user(device, (int __user *)arg))
93 return -EFAULT;
94 mutex_lock(®ister_mutex);
95 device = snd_pcm_next(card, device);
96 mutex_unlock(®ister_mutex);
97 if (put_user(device, (int __user *)arg))
98 return -EFAULT;
99 return 0;
100 }
101 case SNDRV_CTL_IOCTL_PCM_INFO:
102 {
103 struct snd_pcm_info __user *info;
104 unsigned int device, subdevice;
105 int stream;
106 struct snd_pcm *pcm;
107 struct snd_pcm_str *pstr;
108 struct snd_pcm_substream *substream;
109 int err;
110
111 info = (struct snd_pcm_info __user *)arg;
112 if (get_user(device, &info->device))
113 return -EFAULT;
114 if (get_user(stream, &info->stream))
115 return -EFAULT;
116 if (stream < 0 || stream > 1)
117 return -EINVAL;
118 stream = array_index_nospec(stream, 2);
119 if (get_user(subdevice, &info->subdevice))
120 return -EFAULT;
121 mutex_lock(®ister_mutex);
122 pcm = snd_pcm_get(card, device);
123 if (pcm == NULL) {
124 err = -ENXIO;
125 goto _error;
126 }
127 pstr = &pcm->streams[stream];
128 if (pstr->substream_count == 0) {
129 err = -ENOENT;
130 goto _error;
131 }
132 if (subdevice >= pstr->substream_count) {
133 err = -ENXIO;
134 goto _error;
135 }
136 for (substream = pstr->substream; substream;
137 substream = substream->next)
138 if (substream->number == (int)subdevice)
139 break;
140 if (substream == NULL) {
141 err = -ENXIO;
142 goto _error;
143 }
144 mutex_lock(&pcm->open_mutex);
145 err = snd_pcm_info_user(substream, info);
146 mutex_unlock(&pcm->open_mutex);
147 _error:
148 mutex_unlock(®ister_mutex);
149 return err;
150 }
151 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
152 {
153 int val;
154
155 if (get_user(val, (int __user *)arg))
156 return -EFAULT;
157 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
158 return 0;
159 }
160 }
161 return -ENOIOCTLCMD;
162 }
163
164 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
165
166 static const char * const snd_pcm_format_names[] = {
167 FORMAT(S8),
168 FORMAT(U8),
169 FORMAT(S16_LE),
170 FORMAT(S16_BE),
171 FORMAT(U16_LE),
172 FORMAT(U16_BE),
173 FORMAT(S24_LE),
174 FORMAT(S24_BE),
175 FORMAT(U24_LE),
176 FORMAT(U24_BE),
177 FORMAT(S32_LE),
178 FORMAT(S32_BE),
179 FORMAT(U32_LE),
180 FORMAT(U32_BE),
181 FORMAT(FLOAT_LE),
182 FORMAT(FLOAT_BE),
183 FORMAT(FLOAT64_LE),
184 FORMAT(FLOAT64_BE),
185 FORMAT(IEC958_SUBFRAME_LE),
186 FORMAT(IEC958_SUBFRAME_BE),
187 FORMAT(MU_LAW),
188 FORMAT(A_LAW),
189 FORMAT(IMA_ADPCM),
190 FORMAT(MPEG),
191 FORMAT(GSM),
192 FORMAT(SPECIAL),
193 FORMAT(S24_3LE),
194 FORMAT(S24_3BE),
195 FORMAT(U24_3LE),
196 FORMAT(U24_3BE),
197 FORMAT(S20_3LE),
198 FORMAT(S20_3BE),
199 FORMAT(U20_3LE),
200 FORMAT(U20_3BE),
201 FORMAT(S18_3LE),
202 FORMAT(S18_3BE),
203 FORMAT(U18_3LE),
204 FORMAT(U18_3BE),
205 FORMAT(G723_24),
206 FORMAT(G723_24_1B),
207 FORMAT(G723_40),
208 FORMAT(G723_40_1B),
209 FORMAT(DSD_U8),
210 FORMAT(DSD_U16_LE),
211 FORMAT(DSD_U32_LE),
212 FORMAT(DSD_U16_BE),
213 FORMAT(DSD_U32_BE),
214 };
215
216 /**
217 * snd_pcm_format_name - Return a name string for the given PCM format
218 * @format: PCM format
219 *
220 * Return: the format name string
221 */
snd_pcm_format_name(snd_pcm_format_t format)222 const char *snd_pcm_format_name(snd_pcm_format_t format)
223 {
224 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
225 return "Unknown";
226 return snd_pcm_format_names[(__force unsigned int)format];
227 }
228 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
229
230 #ifdef CONFIG_SND_VERBOSE_PROCFS
231
232 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
233 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
234 #define READY(v) [SNDRV_PCM_READY_##v] = #v
235 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
236 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
237 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
238 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
239 #define START(v) [SNDRV_PCM_START_##v] = #v
240 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
241
242 static const char * const snd_pcm_stream_names[] = {
243 STREAM(PLAYBACK),
244 STREAM(CAPTURE),
245 };
246
247 static const char * const snd_pcm_state_names[] = {
248 STATE(OPEN),
249 STATE(SETUP),
250 STATE(PREPARED),
251 STATE(RUNNING),
252 STATE(XRUN),
253 STATE(DRAINING),
254 STATE(PAUSED),
255 STATE(SUSPENDED),
256 };
257
258 static const char * const snd_pcm_access_names[] = {
259 ACCESS(MMAP_INTERLEAVED),
260 ACCESS(MMAP_NONINTERLEAVED),
261 ACCESS(MMAP_COMPLEX),
262 ACCESS(RW_INTERLEAVED),
263 ACCESS(RW_NONINTERLEAVED),
264 };
265
266 static const char * const snd_pcm_subformat_names[] = {
267 SUBFORMAT(STD),
268 };
269
270 static const char * const snd_pcm_tstamp_mode_names[] = {
271 TSTAMP(NONE),
272 TSTAMP(ENABLE),
273 };
274
snd_pcm_stream_name(int stream)275 static const char *snd_pcm_stream_name(int stream)
276 {
277 return snd_pcm_stream_names[stream];
278 }
279
snd_pcm_access_name(snd_pcm_access_t access)280 static const char *snd_pcm_access_name(snd_pcm_access_t access)
281 {
282 return snd_pcm_access_names[(__force int)access];
283 }
284
snd_pcm_subformat_name(snd_pcm_subformat_t subformat)285 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
286 {
287 return snd_pcm_subformat_names[(__force int)subformat];
288 }
289
snd_pcm_tstamp_mode_name(int mode)290 static const char *snd_pcm_tstamp_mode_name(int mode)
291 {
292 return snd_pcm_tstamp_mode_names[mode];
293 }
294
snd_pcm_state_name(snd_pcm_state_t state)295 static const char *snd_pcm_state_name(snd_pcm_state_t state)
296 {
297 return snd_pcm_state_names[(__force int)state];
298 }
299
300 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
301 #include <linux/soundcard.h>
302
snd_pcm_oss_format_name(int format)303 static const char *snd_pcm_oss_format_name(int format)
304 {
305 switch (format) {
306 case AFMT_MU_LAW:
307 return "MU_LAW";
308 case AFMT_A_LAW:
309 return "A_LAW";
310 case AFMT_IMA_ADPCM:
311 return "IMA_ADPCM";
312 case AFMT_U8:
313 return "U8";
314 case AFMT_S16_LE:
315 return "S16_LE";
316 case AFMT_S16_BE:
317 return "S16_BE";
318 case AFMT_S8:
319 return "S8";
320 case AFMT_U16_LE:
321 return "U16_LE";
322 case AFMT_U16_BE:
323 return "U16_BE";
324 case AFMT_MPEG:
325 return "MPEG";
326 default:
327 return "unknown";
328 }
329 }
330 #endif
331
snd_pcm_proc_info_read(struct snd_pcm_substream * substream,struct snd_info_buffer * buffer)332 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
333 struct snd_info_buffer *buffer)
334 {
335 struct snd_pcm_info *info;
336 int err;
337
338 if (! substream)
339 return;
340
341 info = kmalloc(sizeof(*info), GFP_KERNEL);
342 if (!info)
343 return;
344
345 err = snd_pcm_info(substream, info);
346 if (err < 0) {
347 snd_iprintf(buffer, "error %d\n", err);
348 kfree(info);
349 return;
350 }
351 snd_iprintf(buffer, "card: %d\n", info->card);
352 snd_iprintf(buffer, "device: %d\n", info->device);
353 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
354 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
355 snd_iprintf(buffer, "id: %s\n", info->id);
356 snd_iprintf(buffer, "name: %s\n", info->name);
357 snd_iprintf(buffer, "subname: %s\n", info->subname);
358 snd_iprintf(buffer, "class: %d\n", info->dev_class);
359 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
360 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
361 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
362 kfree(info);
363 }
364
snd_pcm_stream_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)365 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
367 {
368 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
369 buffer);
370 }
371
snd_pcm_substream_proc_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)372 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
373 struct snd_info_buffer *buffer)
374 {
375 snd_pcm_proc_info_read(entry->private_data, buffer);
376 }
377
snd_pcm_substream_proc_hw_params_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)378 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
379 struct snd_info_buffer *buffer)
380 {
381 struct snd_pcm_substream *substream = entry->private_data;
382 struct snd_pcm_runtime *runtime;
383
384 mutex_lock(&substream->pcm->open_mutex);
385 runtime = substream->runtime;
386 if (!runtime) {
387 snd_iprintf(buffer, "closed\n");
388 goto unlock;
389 }
390 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
391 snd_iprintf(buffer, "no setup\n");
392 goto unlock;
393 }
394 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
395 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
396 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
397 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
398 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
399 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
400 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
401 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
402 if (substream->oss.oss) {
403 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
404 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
405 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
406 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
407 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
408 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
409 }
410 #endif
411 unlock:
412 mutex_unlock(&substream->pcm->open_mutex);
413 }
414
snd_pcm_substream_proc_sw_params_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)415 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
416 struct snd_info_buffer *buffer)
417 {
418 struct snd_pcm_substream *substream = entry->private_data;
419 struct snd_pcm_runtime *runtime;
420
421 mutex_lock(&substream->pcm->open_mutex);
422 runtime = substream->runtime;
423 if (!runtime) {
424 snd_iprintf(buffer, "closed\n");
425 goto unlock;
426 }
427 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
428 snd_iprintf(buffer, "no setup\n");
429 goto unlock;
430 }
431 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
432 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
433 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
434 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
435 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
436 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
437 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
438 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
439 unlock:
440 mutex_unlock(&substream->pcm->open_mutex);
441 }
442
snd_pcm_substream_proc_status_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)443 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
444 struct snd_info_buffer *buffer)
445 {
446 struct snd_pcm_substream *substream = entry->private_data;
447 struct snd_pcm_runtime *runtime;
448 struct snd_pcm_status64 status;
449 int err;
450
451 mutex_lock(&substream->pcm->open_mutex);
452 runtime = substream->runtime;
453 if (!runtime) {
454 snd_iprintf(buffer, "closed\n");
455 goto unlock;
456 }
457 memset(&status, 0, sizeof(status));
458 err = snd_pcm_status64(substream, &status);
459 if (err < 0) {
460 snd_iprintf(buffer, "error %d\n", err);
461 goto unlock;
462 }
463 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
464 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
465 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
466 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
467 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
468 status.tstamp_sec, status.tstamp_nsec);
469 snd_iprintf(buffer, "delay : %ld\n", status.delay);
470 snd_iprintf(buffer, "avail : %ld\n", status.avail);
471 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
472 snd_iprintf(buffer, "-----\n");
473 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
474 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
475 unlock:
476 mutex_unlock(&substream->pcm->open_mutex);
477 }
478
479 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
snd_pcm_xrun_injection_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)480 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
481 struct snd_info_buffer *buffer)
482 {
483 struct snd_pcm_substream *substream = entry->private_data;
484
485 snd_pcm_stop_xrun(substream);
486 }
487
snd_pcm_xrun_debug_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)488 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
489 struct snd_info_buffer *buffer)
490 {
491 struct snd_pcm_str *pstr = entry->private_data;
492 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
493 }
494
snd_pcm_xrun_debug_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)495 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
496 struct snd_info_buffer *buffer)
497 {
498 struct snd_pcm_str *pstr = entry->private_data;
499 char line[64];
500 if (!snd_info_get_line(buffer, line, sizeof(line)))
501 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
502 }
503 #endif
504
snd_pcm_stream_proc_init(struct snd_pcm_str * pstr)505 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
506 {
507 struct snd_pcm *pcm = pstr->pcm;
508 struct snd_info_entry *entry;
509 char name[16];
510
511 sprintf(name, "pcm%i%c", pcm->device,
512 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
513 entry = snd_info_create_card_entry(pcm->card, name,
514 pcm->card->proc_root);
515 if (!entry)
516 return -ENOMEM;
517 entry->mode = S_IFDIR | 0555;
518 pstr->proc_root = entry;
519 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
520 if (entry)
521 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
522 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
523 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
524 pstr->proc_root);
525 if (entry) {
526 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
527 entry->c.text.write = snd_pcm_xrun_debug_write;
528 entry->mode |= 0200;
529 }
530 #endif
531 return 0;
532 }
533
snd_pcm_stream_proc_done(struct snd_pcm_str * pstr)534 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
535 {
536 snd_info_free_entry(pstr->proc_root);
537 pstr->proc_root = NULL;
538 return 0;
539 }
540
541 static struct snd_info_entry *
create_substream_info_entry(struct snd_pcm_substream * substream,const char * name,void (* read)(struct snd_info_entry *,struct snd_info_buffer *))542 create_substream_info_entry(struct snd_pcm_substream *substream,
543 const char *name,
544 void (*read)(struct snd_info_entry *,
545 struct snd_info_buffer *))
546 {
547 struct snd_info_entry *entry;
548
549 entry = snd_info_create_card_entry(substream->pcm->card, name,
550 substream->proc_root);
551 if (entry)
552 snd_info_set_text_ops(entry, substream, read);
553 return entry;
554 }
555
snd_pcm_substream_proc_init(struct snd_pcm_substream * substream)556 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
557 {
558 struct snd_info_entry *entry;
559 struct snd_card *card;
560 char name[16];
561
562 card = substream->pcm->card;
563
564 sprintf(name, "sub%i", substream->number);
565 entry = snd_info_create_card_entry(card, name,
566 substream->pstr->proc_root);
567 if (!entry)
568 return -ENOMEM;
569 entry->mode = S_IFDIR | 0555;
570 substream->proc_root = entry;
571
572 create_substream_info_entry(substream, "info",
573 snd_pcm_substream_proc_info_read);
574 create_substream_info_entry(substream, "hw_params",
575 snd_pcm_substream_proc_hw_params_read);
576 create_substream_info_entry(substream, "sw_params",
577 snd_pcm_substream_proc_sw_params_read);
578 create_substream_info_entry(substream, "status",
579 snd_pcm_substream_proc_status_read);
580
581 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
582 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
583 if (entry) {
584 entry->c.text.write = snd_pcm_xrun_injection_write;
585 entry->mode = S_IFREG | 0200;
586 }
587 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
588
589 return 0;
590 }
591
592 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_stream_proc_init(struct snd_pcm_str * pstr)593 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)594 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)595 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
596 #endif /* CONFIG_SND_VERBOSE_PROCFS */
597
598 static const struct attribute_group *pcm_dev_attr_groups[];
599
600 /*
601 * PM callbacks: we need to deal only with suspend here, as the resume is
602 * triggered either from user-space or the driver's resume callback
603 */
604 #ifdef CONFIG_PM_SLEEP
do_pcm_suspend(struct device * dev)605 static int do_pcm_suspend(struct device *dev)
606 {
607 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
608
609 if (!pstr->pcm->no_device_suspend)
610 snd_pcm_suspend_all(pstr->pcm);
611 return 0;
612 }
613 #endif
614
615 static const struct dev_pm_ops pcm_dev_pm_ops = {
616 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
617 };
618
619 /* device type for PCM -- basically only for passing PM callbacks */
620 static const struct device_type pcm_dev_type = {
621 .name = "pcm",
622 .pm = &pcm_dev_pm_ops,
623 };
624
625 /**
626 * snd_pcm_new_stream - create a new PCM stream
627 * @pcm: the pcm instance
628 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
629 * @substream_count: the number of substreams
630 *
631 * Creates a new stream for the pcm.
632 * The corresponding stream on the pcm must have been empty before
633 * calling this, i.e. zero must be given to the argument of
634 * snd_pcm_new().
635 *
636 * Return: Zero if successful, or a negative error code on failure.
637 */
snd_pcm_new_stream(struct snd_pcm * pcm,int stream,int substream_count)638 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
639 {
640 int idx, err;
641 struct snd_pcm_str *pstr = &pcm->streams[stream];
642 struct snd_pcm_substream *substream, *prev;
643
644 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
645 mutex_init(&pstr->oss.setup_mutex);
646 #endif
647 pstr->stream = stream;
648 pstr->pcm = pcm;
649 pstr->substream_count = substream_count;
650 if (!substream_count)
651 return 0;
652
653 snd_device_initialize(&pstr->dev, pcm->card);
654 pstr->dev.groups = pcm_dev_attr_groups;
655 pstr->dev.type = &pcm_dev_type;
656 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
657 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
658
659 if (!pcm->internal) {
660 err = snd_pcm_stream_proc_init(pstr);
661 if (err < 0) {
662 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
663 return err;
664 }
665 }
666 prev = NULL;
667 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
668 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
669 if (!substream)
670 return -ENOMEM;
671 substream->pcm = pcm;
672 substream->pstr = pstr;
673 substream->number = idx;
674 substream->stream = stream;
675 sprintf(substream->name, "subdevice #%i", idx);
676 substream->buffer_bytes_max = UINT_MAX;
677 if (prev == NULL)
678 pstr->substream = substream;
679 else
680 prev->next = substream;
681
682 if (!pcm->internal) {
683 err = snd_pcm_substream_proc_init(substream);
684 if (err < 0) {
685 pcm_err(pcm,
686 "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 snd_pcm_group_init(&substream->self_group);
697 list_add_tail(&substream->link_list, &substream->self_group.substreams);
698 atomic_set(&substream->mmap_count, 0);
699 prev = substream;
700 }
701 return 0;
702 }
703 EXPORT_SYMBOL(snd_pcm_new_stream);
704
_snd_pcm_new(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,bool internal,struct snd_pcm ** rpcm)705 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
706 int playback_count, int capture_count, bool internal,
707 struct snd_pcm **rpcm)
708 {
709 struct snd_pcm *pcm;
710 int err;
711 static const struct snd_device_ops ops = {
712 .dev_free = snd_pcm_dev_free,
713 .dev_register = snd_pcm_dev_register,
714 .dev_disconnect = snd_pcm_dev_disconnect,
715 };
716 static const struct snd_device_ops internal_ops = {
717 .dev_free = snd_pcm_dev_free,
718 };
719
720 if (snd_BUG_ON(!card))
721 return -ENXIO;
722 if (rpcm)
723 *rpcm = NULL;
724 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
725 if (!pcm)
726 return -ENOMEM;
727 pcm->card = card;
728 pcm->device = device;
729 pcm->internal = internal;
730 mutex_init(&pcm->open_mutex);
731 init_waitqueue_head(&pcm->open_wait);
732 INIT_LIST_HEAD(&pcm->list);
733 if (id)
734 strscpy(pcm->id, id, sizeof(pcm->id));
735
736 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
737 playback_count);
738 if (err < 0)
739 goto free_pcm;
740
741 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
742 if (err < 0)
743 goto free_pcm;
744
745 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
746 internal ? &internal_ops : &ops);
747 if (err < 0)
748 goto free_pcm;
749
750 if (rpcm)
751 *rpcm = pcm;
752 return 0;
753
754 free_pcm:
755 snd_pcm_free(pcm);
756 return err;
757 }
758
759 /**
760 * snd_pcm_new - create a new PCM instance
761 * @card: the card instance
762 * @id: the id string
763 * @device: the device index (zero based)
764 * @playback_count: the number of substreams for playback
765 * @capture_count: the number of substreams for capture
766 * @rpcm: the pointer to store the new pcm instance
767 *
768 * Creates a new PCM instance.
769 *
770 * The pcm operators have to be set afterwards to the new instance
771 * via snd_pcm_set_ops().
772 *
773 * Return: Zero if successful, or a negative error code on failure.
774 */
snd_pcm_new(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,struct snd_pcm ** rpcm)775 int snd_pcm_new(struct snd_card *card, const char *id, int device,
776 int playback_count, int capture_count, struct snd_pcm **rpcm)
777 {
778 return _snd_pcm_new(card, id, device, playback_count, capture_count,
779 false, rpcm);
780 }
781 EXPORT_SYMBOL(snd_pcm_new);
782
783 /**
784 * snd_pcm_new_internal - create a new internal PCM instance
785 * @card: the card instance
786 * @id: the id string
787 * @device: the device index (zero based - shared with normal PCMs)
788 * @playback_count: the number of substreams for playback
789 * @capture_count: the number of substreams for capture
790 * @rpcm: the pointer to store the new pcm instance
791 *
792 * Creates a new internal PCM instance with no userspace device or procfs
793 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
794 * will only be used internally by kernel drivers. i.e. it cannot be opened
795 * by userspace. It provides existing ASoC components drivers with a substream
796 * and access to any private data.
797 *
798 * The pcm operators have to be set afterwards to the new instance
799 * via snd_pcm_set_ops().
800 *
801 * Return: Zero if successful, or a negative error code on failure.
802 */
snd_pcm_new_internal(struct snd_card * card,const char * id,int device,int playback_count,int capture_count,struct snd_pcm ** rpcm)803 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
804 int playback_count, int capture_count,
805 struct snd_pcm **rpcm)
806 {
807 return _snd_pcm_new(card, id, device, playback_count, capture_count,
808 true, rpcm);
809 }
810 EXPORT_SYMBOL(snd_pcm_new_internal);
811
free_chmap(struct snd_pcm_str * pstr)812 static void free_chmap(struct snd_pcm_str *pstr)
813 {
814 if (pstr->chmap_kctl) {
815 struct snd_card *card = pstr->pcm->card;
816
817 down_write(&card->controls_rwsem);
818 snd_ctl_remove(card, pstr->chmap_kctl);
819 up_write(&card->controls_rwsem);
820 pstr->chmap_kctl = NULL;
821 }
822 }
823
snd_pcm_free_stream(struct snd_pcm_str * pstr)824 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
825 {
826 struct snd_pcm_substream *substream, *substream_next;
827 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
828 struct snd_pcm_oss_setup *setup, *setupn;
829 #endif
830
831 /* free all proc files under the stream */
832 snd_pcm_stream_proc_done(pstr);
833
834 substream = pstr->substream;
835 while (substream) {
836 substream_next = substream->next;
837 snd_pcm_timer_done(substream);
838 kfree(substream);
839 substream = substream_next;
840 }
841 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
842 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
843 setupn = setup->next;
844 kfree(setup->task_name);
845 kfree(setup);
846 }
847 #endif
848 free_chmap(pstr);
849 if (pstr->substream_count)
850 put_device(&pstr->dev);
851 }
852
853 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
854 #define pcm_call_notify(pcm, call) \
855 do { \
856 struct snd_pcm_notify *_notify; \
857 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
858 _notify->call(pcm); \
859 } while (0)
860 #else
861 #define pcm_call_notify(pcm, call) do {} while (0)
862 #endif
863
snd_pcm_free(struct snd_pcm * pcm)864 static int snd_pcm_free(struct snd_pcm *pcm)
865 {
866 if (!pcm)
867 return 0;
868 if (!pcm->internal)
869 pcm_call_notify(pcm, n_unregister);
870 if (pcm->private_free)
871 pcm->private_free(pcm);
872 snd_pcm_lib_preallocate_free_for_all(pcm);
873 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
874 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
875 kfree(pcm);
876 return 0;
877 }
878
snd_pcm_dev_free(struct snd_device * device)879 static int snd_pcm_dev_free(struct snd_device *device)
880 {
881 struct snd_pcm *pcm = device->device_data;
882 return snd_pcm_free(pcm);
883 }
884
snd_pcm_attach_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)885 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
886 struct file *file,
887 struct snd_pcm_substream **rsubstream)
888 {
889 struct snd_pcm_str * pstr;
890 struct snd_pcm_substream *substream;
891 struct snd_pcm_runtime *runtime;
892 struct snd_card *card;
893 int prefer_subdevice;
894 size_t size;
895
896 if (snd_BUG_ON(!pcm || !rsubstream))
897 return -ENXIO;
898 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
899 stream != SNDRV_PCM_STREAM_CAPTURE))
900 return -EINVAL;
901 *rsubstream = NULL;
902 pstr = &pcm->streams[stream];
903 if (pstr->substream == NULL || pstr->substream_count == 0)
904 return -ENODEV;
905
906 card = pcm->card;
907 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
908
909 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
910 int opposite = !stream;
911
912 for (substream = pcm->streams[opposite].substream; substream;
913 substream = substream->next) {
914 if (SUBSTREAM_BUSY(substream))
915 return -EAGAIN;
916 }
917 }
918
919 if (file->f_flags & O_APPEND) {
920 if (prefer_subdevice < 0) {
921 if (pstr->substream_count > 1)
922 return -EINVAL; /* must be unique */
923 substream = pstr->substream;
924 } else {
925 for (substream = pstr->substream; substream;
926 substream = substream->next)
927 if (substream->number == prefer_subdevice)
928 break;
929 }
930 if (! substream)
931 return -ENODEV;
932 if (! SUBSTREAM_BUSY(substream))
933 return -EBADFD;
934 substream->ref_count++;
935 *rsubstream = substream;
936 return 0;
937 }
938
939 for (substream = pstr->substream; substream; substream = substream->next) {
940 if (!SUBSTREAM_BUSY(substream) &&
941 (prefer_subdevice == -1 ||
942 substream->number == prefer_subdevice))
943 break;
944 }
945 if (substream == NULL)
946 return -EAGAIN;
947
948 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
949 if (runtime == NULL)
950 return -ENOMEM;
951
952 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
953 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
954 if (runtime->status == NULL) {
955 kfree(runtime);
956 return -ENOMEM;
957 }
958 memset(runtime->status, 0, size);
959
960 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
961 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
962 if (runtime->control == NULL) {
963 free_pages_exact(runtime->status,
964 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
965 kfree(runtime);
966 return -ENOMEM;
967 }
968 memset(runtime->control, 0, size);
969
970 init_waitqueue_head(&runtime->sleep);
971 init_waitqueue_head(&runtime->tsleep);
972
973 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
974 mutex_init(&runtime->buffer_mutex);
975 atomic_set(&runtime->buffer_accessing, 0);
976
977 substream->runtime = runtime;
978 substream->private_data = pcm->private_data;
979 substream->ref_count = 1;
980 substream->f_flags = file->f_flags;
981 substream->pid = get_pid(task_pid(current));
982 pstr->substream_opened++;
983 *rsubstream = substream;
984 return 0;
985 }
986
snd_pcm_detach_substream(struct snd_pcm_substream * substream)987 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
988 {
989 struct snd_pcm_runtime *runtime;
990
991 if (PCM_RUNTIME_CHECK(substream))
992 return;
993 runtime = substream->runtime;
994 if (runtime->private_free != NULL)
995 runtime->private_free(runtime);
996 free_pages_exact(runtime->status,
997 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
998 free_pages_exact(runtime->control,
999 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1000 kfree(runtime->hw_constraints.rules);
1001 /* Avoid concurrent access to runtime via PCM timer interface */
1002 if (substream->timer) {
1003 spin_lock_irq(&substream->timer->lock);
1004 substream->runtime = NULL;
1005 spin_unlock_irq(&substream->timer->lock);
1006 } else {
1007 substream->runtime = NULL;
1008 }
1009 mutex_destroy(&runtime->buffer_mutex);
1010 snd_fasync_free(runtime->fasync);
1011 kfree(runtime);
1012 put_pid(substream->pid);
1013 substream->pid = NULL;
1014 substream->pstr->substream_opened--;
1015 }
1016
pcm_class_show(struct device * dev,struct device_attribute * attr,char * buf)1017 static ssize_t pcm_class_show(struct device *dev,
1018 struct device_attribute *attr, char *buf)
1019 {
1020 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1021 struct snd_pcm *pcm = pstr->pcm;
1022 const char *str;
1023 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1024 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1025 [SNDRV_PCM_CLASS_MULTI] = "multi",
1026 [SNDRV_PCM_CLASS_MODEM] = "modem",
1027 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1028 };
1029
1030 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1031 str = "none";
1032 else
1033 str = strs[pcm->dev_class];
1034 return sysfs_emit(buf, "%s\n", str);
1035 }
1036
1037 static DEVICE_ATTR_RO(pcm_class);
1038 static struct attribute *pcm_dev_attrs[] = {
1039 &dev_attr_pcm_class.attr,
1040 NULL
1041 };
1042
1043 static const struct attribute_group pcm_dev_attr_group = {
1044 .attrs = pcm_dev_attrs,
1045 };
1046
1047 static const struct attribute_group *pcm_dev_attr_groups[] = {
1048 &pcm_dev_attr_group,
1049 NULL
1050 };
1051
snd_pcm_dev_register(struct snd_device * device)1052 static int snd_pcm_dev_register(struct snd_device *device)
1053 {
1054 int cidx, err;
1055 struct snd_pcm_substream *substream;
1056 struct snd_pcm *pcm;
1057
1058 if (snd_BUG_ON(!device || !device->device_data))
1059 return -ENXIO;
1060 pcm = device->device_data;
1061
1062 mutex_lock(®ister_mutex);
1063 err = snd_pcm_add(pcm);
1064 if (err)
1065 goto unlock;
1066 for (cidx = 0; cidx < 2; cidx++) {
1067 int devtype = -1;
1068 if (pcm->streams[cidx].substream == NULL)
1069 continue;
1070 switch (cidx) {
1071 case SNDRV_PCM_STREAM_PLAYBACK:
1072 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1073 break;
1074 case SNDRV_PCM_STREAM_CAPTURE:
1075 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1076 break;
1077 }
1078 /* register pcm */
1079 err = snd_register_device(devtype, pcm->card, pcm->device,
1080 &snd_pcm_f_ops[cidx], pcm,
1081 &pcm->streams[cidx].dev);
1082 if (err < 0) {
1083 list_del_init(&pcm->list);
1084 goto unlock;
1085 }
1086
1087 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1088 snd_pcm_timer_init(substream);
1089 }
1090
1091 pcm_call_notify(pcm, n_register);
1092
1093 unlock:
1094 mutex_unlock(®ister_mutex);
1095 return err;
1096 }
1097
snd_pcm_dev_disconnect(struct snd_device * device)1098 static int snd_pcm_dev_disconnect(struct snd_device *device)
1099 {
1100 struct snd_pcm *pcm = device->device_data;
1101 struct snd_pcm_substream *substream;
1102 int cidx;
1103
1104 mutex_lock(®ister_mutex);
1105 mutex_lock(&pcm->open_mutex);
1106 wake_up(&pcm->open_wait);
1107 list_del_init(&pcm->list);
1108
1109 for_each_pcm_substream(pcm, cidx, substream) {
1110 snd_pcm_stream_lock_irq(substream);
1111 if (substream->runtime) {
1112 if (snd_pcm_running(substream))
1113 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1114 /* to be sure, set the state unconditionally */
1115 __snd_pcm_set_state(substream->runtime,
1116 SNDRV_PCM_STATE_DISCONNECTED);
1117 wake_up(&substream->runtime->sleep);
1118 wake_up(&substream->runtime->tsleep);
1119 }
1120 snd_pcm_stream_unlock_irq(substream);
1121 }
1122
1123 for_each_pcm_substream(pcm, cidx, substream)
1124 snd_pcm_sync_stop(substream, false);
1125
1126 pcm_call_notify(pcm, n_disconnect);
1127 for (cidx = 0; cidx < 2; cidx++) {
1128 snd_unregister_device(&pcm->streams[cidx].dev);
1129 free_chmap(&pcm->streams[cidx]);
1130 }
1131 mutex_unlock(&pcm->open_mutex);
1132 mutex_unlock(®ister_mutex);
1133 return 0;
1134 }
1135
1136 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
1137 /**
1138 * snd_pcm_notify - Add/remove the notify list
1139 * @notify: PCM notify list
1140 * @nfree: 0 = register, 1 = unregister
1141 *
1142 * This adds the given notifier to the global list so that the callback is
1143 * called for each registered PCM devices. This exists only for PCM OSS
1144 * emulation, so far.
1145 *
1146 * Return: zero if successful, or a negative error code
1147 */
snd_pcm_notify(struct snd_pcm_notify * notify,int nfree)1148 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1149 {
1150 struct snd_pcm *pcm;
1151
1152 if (snd_BUG_ON(!notify ||
1153 !notify->n_register ||
1154 !notify->n_unregister ||
1155 !notify->n_disconnect))
1156 return -EINVAL;
1157 mutex_lock(®ister_mutex);
1158 if (nfree) {
1159 list_del(¬ify->list);
1160 list_for_each_entry(pcm, &snd_pcm_devices, list)
1161 notify->n_unregister(pcm);
1162 } else {
1163 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1164 list_for_each_entry(pcm, &snd_pcm_devices, list)
1165 notify->n_register(pcm);
1166 }
1167 mutex_unlock(®ister_mutex);
1168 return 0;
1169 }
1170 EXPORT_SYMBOL(snd_pcm_notify);
1171 #endif /* CONFIG_SND_PCM_OSS */
1172
1173 #ifdef CONFIG_SND_PROC_FS
1174 /*
1175 * Info interface
1176 */
1177
snd_pcm_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1178 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1179 struct snd_info_buffer *buffer)
1180 {
1181 struct snd_pcm *pcm;
1182
1183 mutex_lock(®ister_mutex);
1184 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1185 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1186 pcm->card->number, pcm->device, pcm->id, pcm->name);
1187 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1188 snd_iprintf(buffer, " : playback %i",
1189 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1190 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1191 snd_iprintf(buffer, " : capture %i",
1192 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1193 snd_iprintf(buffer, "\n");
1194 }
1195 mutex_unlock(®ister_mutex);
1196 }
1197
1198 static struct snd_info_entry *snd_pcm_proc_entry;
1199
snd_pcm_proc_init(void)1200 static void snd_pcm_proc_init(void)
1201 {
1202 struct snd_info_entry *entry;
1203
1204 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1205 if (entry) {
1206 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1207 if (snd_info_register(entry) < 0) {
1208 snd_info_free_entry(entry);
1209 entry = NULL;
1210 }
1211 }
1212 snd_pcm_proc_entry = entry;
1213 }
1214
snd_pcm_proc_done(void)1215 static void snd_pcm_proc_done(void)
1216 {
1217 snd_info_free_entry(snd_pcm_proc_entry);
1218 }
1219
1220 #else /* !CONFIG_SND_PROC_FS */
1221 #define snd_pcm_proc_init()
1222 #define snd_pcm_proc_done()
1223 #endif /* CONFIG_SND_PROC_FS */
1224
1225
1226 /*
1227 * ENTRY functions
1228 */
1229
alsa_pcm_init(void)1230 static int __init alsa_pcm_init(void)
1231 {
1232 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1233 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1234 snd_pcm_proc_init();
1235 return 0;
1236 }
1237
alsa_pcm_exit(void)1238 static void __exit alsa_pcm_exit(void)
1239 {
1240 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1241 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1242 snd_pcm_proc_done();
1243 }
1244
1245 module_init(alsa_pcm_init)
1246 module_exit(alsa_pcm_exit)
1247