GNU Linux-libre 4.19.211-gnu1
[releases.git] / sound / core / pcm.c
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 <linux/nospec.h>
29 #include <sound/core.h>
30 #include <sound/minors.h>
31 #include <sound/pcm.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35
36 #include "pcm_local.h"
37
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
39 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
40 MODULE_LICENSE("GPL");
41
42 static LIST_HEAD(snd_pcm_devices);
43 static DEFINE_MUTEX(register_mutex);
44 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
45 static LIST_HEAD(snd_pcm_notify_list);
46 #endif
47
48 static int snd_pcm_free(struct snd_pcm *pcm);
49 static int snd_pcm_dev_free(struct snd_device *device);
50 static int snd_pcm_dev_register(struct snd_device *device);
51 static int snd_pcm_dev_disconnect(struct snd_device *device);
52
53 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
54 {
55         struct snd_pcm *pcm;
56
57         list_for_each_entry(pcm, &snd_pcm_devices, list) {
58                 if (pcm->card == card && pcm->device == device)
59                         return pcm;
60         }
61         return NULL;
62 }
63
64 static int snd_pcm_next(struct snd_card *card, int device)
65 {
66         struct snd_pcm *pcm;
67
68         list_for_each_entry(pcm, &snd_pcm_devices, list) {
69                 if (pcm->card == card && pcm->device > device)
70                         return pcm->device;
71                 else if (pcm->card->number > card->number)
72                         return -1;
73         }
74         return -1;
75 }
76
77 static int snd_pcm_add(struct snd_pcm *newpcm)
78 {
79         struct snd_pcm *pcm;
80
81         if (newpcm->internal)
82                 return 0;
83
84         list_for_each_entry(pcm, &snd_pcm_devices, list) {
85                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
86                         return -EBUSY;
87                 if (pcm->card->number > newpcm->card->number ||
88                                 (pcm->card == newpcm->card &&
89                                 pcm->device > newpcm->device)) {
90                         list_add(&newpcm->list, pcm->list.prev);
91                         return 0;
92                 }
93         }
94         list_add_tail(&newpcm->list, &snd_pcm_devices);
95         return 0;
96 }
97
98 static int snd_pcm_control_ioctl(struct snd_card *card,
99                                  struct snd_ctl_file *control,
100                                  unsigned int cmd, unsigned long arg)
101 {
102         switch (cmd) {
103         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
104                 {
105                         int device;
106
107                         if (get_user(device, (int __user *)arg))
108                                 return -EFAULT;
109                         mutex_lock(&register_mutex);
110                         device = snd_pcm_next(card, device);
111                         mutex_unlock(&register_mutex);
112                         if (put_user(device, (int __user *)arg))
113                                 return -EFAULT;
114                         return 0;
115                 }
116         case SNDRV_CTL_IOCTL_PCM_INFO:
117                 {
118                         struct snd_pcm_info __user *info;
119                         unsigned int device, subdevice;
120                         int stream;
121                         struct snd_pcm *pcm;
122                         struct snd_pcm_str *pstr;
123                         struct snd_pcm_substream *substream;
124                         int err;
125
126                         info = (struct snd_pcm_info __user *)arg;
127                         if (get_user(device, &info->device))
128                                 return -EFAULT;
129                         if (get_user(stream, &info->stream))
130                                 return -EFAULT;
131                         if (stream < 0 || stream > 1)
132                                 return -EINVAL;
133                         stream = array_index_nospec(stream, 2);
134                         if (get_user(subdevice, &info->subdevice))
135                                 return -EFAULT;
136                         mutex_lock(&register_mutex);
137                         pcm = snd_pcm_get(card, device);
138                         if (pcm == NULL) {
139                                 err = -ENXIO;
140                                 goto _error;
141                         }
142                         pstr = &pcm->streams[stream];
143                         if (pstr->substream_count == 0) {
144                                 err = -ENOENT;
145                                 goto _error;
146                         }
147                         if (subdevice >= pstr->substream_count) {
148                                 err = -ENXIO;
149                                 goto _error;
150                         }
151                         for (substream = pstr->substream; substream;
152                              substream = substream->next)
153                                 if (substream->number == (int)subdevice)
154                                         break;
155                         if (substream == NULL) {
156                                 err = -ENXIO;
157                                 goto _error;
158                         }
159                         mutex_lock(&pcm->open_mutex);
160                         err = snd_pcm_info_user(substream, info);
161                         mutex_unlock(&pcm->open_mutex);
162                 _error:
163                         mutex_unlock(&register_mutex);
164                         return err;
165                 }
166         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
167                 {
168                         int val;
169                         
170                         if (get_user(val, (int __user *)arg))
171                                 return -EFAULT;
172                         control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
173                         return 0;
174                 }
175         }
176         return -ENOIOCTLCMD;
177 }
178
179 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
180
181 static char *snd_pcm_format_names[] = {
182         FORMAT(S8),
183         FORMAT(U8),
184         FORMAT(S16_LE),
185         FORMAT(S16_BE),
186         FORMAT(U16_LE),
187         FORMAT(U16_BE),
188         FORMAT(S24_LE),
189         FORMAT(S24_BE),
190         FORMAT(U24_LE),
191         FORMAT(U24_BE),
192         FORMAT(S32_LE),
193         FORMAT(S32_BE),
194         FORMAT(U32_LE),
195         FORMAT(U32_BE),
196         FORMAT(FLOAT_LE),
197         FORMAT(FLOAT_BE),
198         FORMAT(FLOAT64_LE),
199         FORMAT(FLOAT64_BE),
200         FORMAT(IEC958_SUBFRAME_LE),
201         FORMAT(IEC958_SUBFRAME_BE),
202         FORMAT(MU_LAW),
203         FORMAT(A_LAW),
204         FORMAT(IMA_ADPCM),
205         FORMAT(MPEG),
206         FORMAT(GSM),
207         FORMAT(SPECIAL),
208         FORMAT(S24_3LE),
209         FORMAT(S24_3BE),
210         FORMAT(U24_3LE),
211         FORMAT(U24_3BE),
212         FORMAT(S20_3LE),
213         FORMAT(S20_3BE),
214         FORMAT(U20_3LE),
215         FORMAT(U20_3BE),
216         FORMAT(S18_3LE),
217         FORMAT(S18_3BE),
218         FORMAT(U18_3LE),
219         FORMAT(U18_3BE),
220         FORMAT(G723_24),
221         FORMAT(G723_24_1B),
222         FORMAT(G723_40),
223         FORMAT(G723_40_1B),
224         FORMAT(DSD_U8),
225         FORMAT(DSD_U16_LE),
226         FORMAT(DSD_U32_LE),
227         FORMAT(DSD_U16_BE),
228         FORMAT(DSD_U32_BE),
229 };
230
231 /**
232  * snd_pcm_format_name - Return a name string for the given PCM format
233  * @format: PCM format
234  */
235 const char *snd_pcm_format_name(snd_pcm_format_t format)
236 {
237         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
238                 return "Unknown";
239         return snd_pcm_format_names[(__force unsigned int)format];
240 }
241 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
242
243 #ifdef CONFIG_SND_VERBOSE_PROCFS
244
245 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
246 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
247 #define READY(v) [SNDRV_PCM_READY_##v] = #v
248 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
249 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
250 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
251 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
252 #define START(v) [SNDRV_PCM_START_##v] = #v
253 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
254
255 static char *snd_pcm_stream_names[] = {
256         STREAM(PLAYBACK),
257         STREAM(CAPTURE),
258 };
259
260 static char *snd_pcm_state_names[] = {
261         STATE(OPEN),
262         STATE(SETUP),
263         STATE(PREPARED),
264         STATE(RUNNING),
265         STATE(XRUN),
266         STATE(DRAINING),
267         STATE(PAUSED),
268         STATE(SUSPENDED),
269 };
270
271 static char *snd_pcm_access_names[] = {
272         ACCESS(MMAP_INTERLEAVED), 
273         ACCESS(MMAP_NONINTERLEAVED),
274         ACCESS(MMAP_COMPLEX),
275         ACCESS(RW_INTERLEAVED),
276         ACCESS(RW_NONINTERLEAVED),
277 };
278
279 static char *snd_pcm_subformat_names[] = {
280         SUBFORMAT(STD), 
281 };
282
283 static char *snd_pcm_tstamp_mode_names[] = {
284         TSTAMP(NONE),
285         TSTAMP(ENABLE),
286 };
287
288 static const char *snd_pcm_stream_name(int stream)
289 {
290         return snd_pcm_stream_names[stream];
291 }
292
293 static const char *snd_pcm_access_name(snd_pcm_access_t access)
294 {
295         return snd_pcm_access_names[(__force int)access];
296 }
297
298 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
299 {
300         return snd_pcm_subformat_names[(__force int)subformat];
301 }
302
303 static const char *snd_pcm_tstamp_mode_name(int mode)
304 {
305         return snd_pcm_tstamp_mode_names[mode];
306 }
307
308 static const char *snd_pcm_state_name(snd_pcm_state_t state)
309 {
310         return snd_pcm_state_names[(__force int)state];
311 }
312
313 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
314 #include <linux/soundcard.h>
315
316 static const char *snd_pcm_oss_format_name(int format)
317 {
318         switch (format) {
319         case AFMT_MU_LAW:
320                 return "MU_LAW";
321         case AFMT_A_LAW:
322                 return "A_LAW";
323         case AFMT_IMA_ADPCM:
324                 return "IMA_ADPCM";
325         case AFMT_U8:
326                 return "U8";
327         case AFMT_S16_LE:
328                 return "S16_LE";
329         case AFMT_S16_BE:
330                 return "S16_BE";
331         case AFMT_S8:
332                 return "S8";
333         case AFMT_U16_LE:
334                 return "U16_LE";
335         case AFMT_U16_BE:
336                 return "U16_BE";
337         case AFMT_MPEG:
338                 return "MPEG";
339         default:
340                 return "unknown";
341         }
342 }
343 #endif
344
345 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
346                                    struct snd_info_buffer *buffer)
347 {
348         struct snd_pcm_info *info;
349         int err;
350
351         if (! substream)
352                 return;
353
354         info = kmalloc(sizeof(*info), GFP_KERNEL);
355         if (!info)
356                 return;
357
358         err = snd_pcm_info(substream, info);
359         if (err < 0) {
360                 snd_iprintf(buffer, "error %d\n", err);
361                 kfree(info);
362                 return;
363         }
364         snd_iprintf(buffer, "card: %d\n", info->card);
365         snd_iprintf(buffer, "device: %d\n", info->device);
366         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
367         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
368         snd_iprintf(buffer, "id: %s\n", info->id);
369         snd_iprintf(buffer, "name: %s\n", info->name);
370         snd_iprintf(buffer, "subname: %s\n", info->subname);
371         snd_iprintf(buffer, "class: %d\n", info->dev_class);
372         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
373         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
374         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
375         kfree(info);
376 }
377
378 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
379                                           struct snd_info_buffer *buffer)
380 {
381         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
382                                buffer);
383 }
384
385 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
386                                              struct snd_info_buffer *buffer)
387 {
388         snd_pcm_proc_info_read(entry->private_data, buffer);
389 }
390
391 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
392                                                   struct snd_info_buffer *buffer)
393 {
394         struct snd_pcm_substream *substream = entry->private_data;
395         struct snd_pcm_runtime *runtime;
396
397         mutex_lock(&substream->pcm->open_mutex);
398         runtime = substream->runtime;
399         if (!runtime) {
400                 snd_iprintf(buffer, "closed\n");
401                 goto unlock;
402         }
403         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
404                 snd_iprintf(buffer, "no setup\n");
405                 goto unlock;
406         }
407         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
408         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
409         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
410         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
411         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
412         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
413         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
414 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
415         if (substream->oss.oss) {
416                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
417                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
418                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
419                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
420                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
421                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
422         }
423 #endif
424  unlock:
425         mutex_unlock(&substream->pcm->open_mutex);
426 }
427
428 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
429                                                   struct snd_info_buffer *buffer)
430 {
431         struct snd_pcm_substream *substream = entry->private_data;
432         struct snd_pcm_runtime *runtime;
433
434         mutex_lock(&substream->pcm->open_mutex);
435         runtime = substream->runtime;
436         if (!runtime) {
437                 snd_iprintf(buffer, "closed\n");
438                 goto unlock;
439         }
440         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
441                 snd_iprintf(buffer, "no setup\n");
442                 goto unlock;
443         }
444         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
445         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
446         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
447         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
448         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
449         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
450         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
451         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
452  unlock:
453         mutex_unlock(&substream->pcm->open_mutex);
454 }
455
456 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
457                                                struct snd_info_buffer *buffer)
458 {
459         struct snd_pcm_substream *substream = entry->private_data;
460         struct snd_pcm_runtime *runtime;
461         struct snd_pcm_status status;
462         int err;
463
464         mutex_lock(&substream->pcm->open_mutex);
465         runtime = substream->runtime;
466         if (!runtime) {
467                 snd_iprintf(buffer, "closed\n");
468                 goto unlock;
469         }
470         memset(&status, 0, sizeof(status));
471         err = snd_pcm_status(substream, &status);
472         if (err < 0) {
473                 snd_iprintf(buffer, "error %d\n", err);
474                 goto unlock;
475         }
476         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
477         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
478         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
479                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
480         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
481                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
482         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
483         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
484         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
485         snd_iprintf(buffer, "-----\n");
486         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
487         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
488  unlock:
489         mutex_unlock(&substream->pcm->open_mutex);
490 }
491
492 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
493 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
494                                          struct snd_info_buffer *buffer)
495 {
496         struct snd_pcm_substream *substream = entry->private_data;
497
498         snd_pcm_stop_xrun(substream);
499 }
500
501 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
502                                     struct snd_info_buffer *buffer)
503 {
504         struct snd_pcm_str *pstr = entry->private_data;
505         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
506 }
507
508 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
509                                      struct snd_info_buffer *buffer)
510 {
511         struct snd_pcm_str *pstr = entry->private_data;
512         char line[64];
513         if (!snd_info_get_line(buffer, line, sizeof(line)))
514                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
515 }
516 #endif
517
518 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
519 {
520         struct snd_pcm *pcm = pstr->pcm;
521         struct snd_info_entry *entry;
522         char name[16];
523
524         sprintf(name, "pcm%i%c", pcm->device, 
525                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
526         entry = snd_info_create_card_entry(pcm->card, name,
527                                            pcm->card->proc_root);
528         if (!entry)
529                 return -ENOMEM;
530         entry->mode = S_IFDIR | 0555;
531         if (snd_info_register(entry) < 0) {
532                 snd_info_free_entry(entry);
533                 return -ENOMEM;
534         }
535         pstr->proc_root = entry;
536         entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
537         if (entry) {
538                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
539                 if (snd_info_register(entry) < 0) {
540                         snd_info_free_entry(entry);
541                         entry = NULL;
542                 }
543         }
544         pstr->proc_info_entry = entry;
545
546 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
547         entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
548                                            pstr->proc_root);
549         if (entry) {
550                 entry->c.text.read = snd_pcm_xrun_debug_read;
551                 entry->c.text.write = snd_pcm_xrun_debug_write;
552                 entry->mode |= 0200;
553                 entry->private_data = pstr;
554                 if (snd_info_register(entry) < 0) {
555                         snd_info_free_entry(entry);
556                         entry = NULL;
557                 }
558         }
559         pstr->proc_xrun_debug_entry = entry;
560 #endif
561         return 0;
562 }
563
564 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
565 {
566 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
567         snd_info_free_entry(pstr->proc_xrun_debug_entry);
568         pstr->proc_xrun_debug_entry = NULL;
569 #endif
570         snd_info_free_entry(pstr->proc_info_entry);
571         pstr->proc_info_entry = NULL;
572         snd_info_free_entry(pstr->proc_root);
573         pstr->proc_root = NULL;
574         return 0;
575 }
576
577 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
578 {
579         struct snd_info_entry *entry;
580         struct snd_card *card;
581         char name[16];
582
583         card = substream->pcm->card;
584
585         sprintf(name, "sub%i", substream->number);
586         entry = snd_info_create_card_entry(card, name,
587                                            substream->pstr->proc_root);
588         if (!entry)
589                 return -ENOMEM;
590         entry->mode = S_IFDIR | 0555;
591         if (snd_info_register(entry) < 0) {
592                 snd_info_free_entry(entry);
593                 return -ENOMEM;
594         }
595         substream->proc_root = entry;
596         entry = snd_info_create_card_entry(card, "info", substream->proc_root);
597         if (entry) {
598                 snd_info_set_text_ops(entry, substream,
599                                       snd_pcm_substream_proc_info_read);
600                 if (snd_info_register(entry) < 0) {
601                         snd_info_free_entry(entry);
602                         entry = NULL;
603                 }
604         }
605         substream->proc_info_entry = entry;
606         entry = snd_info_create_card_entry(card, "hw_params",
607                                            substream->proc_root);
608         if (entry) {
609                 snd_info_set_text_ops(entry, substream,
610                                       snd_pcm_substream_proc_hw_params_read);
611                 if (snd_info_register(entry) < 0) {
612                         snd_info_free_entry(entry);
613                         entry = NULL;
614                 }
615         }
616         substream->proc_hw_params_entry = entry;
617         entry = snd_info_create_card_entry(card, "sw_params",
618                                            substream->proc_root);
619         if (entry) {
620                 snd_info_set_text_ops(entry, substream,
621                                       snd_pcm_substream_proc_sw_params_read);
622                 if (snd_info_register(entry) < 0) {
623                         snd_info_free_entry(entry);
624                         entry = NULL;
625                 }
626         }
627         substream->proc_sw_params_entry = entry;
628         entry = snd_info_create_card_entry(card, "status",
629                                            substream->proc_root);
630         if (entry) {
631                 snd_info_set_text_ops(entry, substream,
632                                       snd_pcm_substream_proc_status_read);
633                 if (snd_info_register(entry) < 0) {
634                         snd_info_free_entry(entry);
635                         entry = NULL;
636                 }
637         }
638         substream->proc_status_entry = entry;
639
640 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
641         entry = snd_info_create_card_entry(card, "xrun_injection",
642                                            substream->proc_root);
643         if (entry) {
644                 entry->private_data = substream;
645                 entry->c.text.read = NULL;
646                 entry->c.text.write = snd_pcm_xrun_injection_write;
647                 entry->mode = S_IFREG | 0200;
648                 if (snd_info_register(entry) < 0) {
649                         snd_info_free_entry(entry);
650                         entry = NULL;
651                 }
652         }
653         substream->proc_xrun_injection_entry = entry;
654 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
655
656         return 0;
657 }
658
659 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
660 {
661         snd_info_free_entry(substream->proc_info_entry);
662         substream->proc_info_entry = NULL;
663         snd_info_free_entry(substream->proc_hw_params_entry);
664         substream->proc_hw_params_entry = NULL;
665         snd_info_free_entry(substream->proc_sw_params_entry);
666         substream->proc_sw_params_entry = NULL;
667         snd_info_free_entry(substream->proc_status_entry);
668         substream->proc_status_entry = NULL;
669 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
670         snd_info_free_entry(substream->proc_xrun_injection_entry);
671         substream->proc_xrun_injection_entry = NULL;
672 #endif
673         snd_info_free_entry(substream->proc_root);
674         substream->proc_root = NULL;
675         return 0;
676 }
677 #else /* !CONFIG_SND_VERBOSE_PROCFS */
678 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
679 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
680 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
681 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
682 #endif /* CONFIG_SND_VERBOSE_PROCFS */
683
684 static const struct attribute_group *pcm_dev_attr_groups[];
685
686 /**
687  * snd_pcm_new_stream - create a new PCM stream
688  * @pcm: the pcm instance
689  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
690  * @substream_count: the number of substreams
691  *
692  * Creates a new stream for the pcm.
693  * The corresponding stream on the pcm must have been empty before
694  * calling this, i.e. zero must be given to the argument of
695  * snd_pcm_new().
696  *
697  * Return: Zero if successful, or a negative error code on failure.
698  */
699 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
700 {
701         int idx, err;
702         struct snd_pcm_str *pstr = &pcm->streams[stream];
703         struct snd_pcm_substream *substream, *prev;
704
705 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
706         mutex_init(&pstr->oss.setup_mutex);
707 #endif
708         pstr->stream = stream;
709         pstr->pcm = pcm;
710         pstr->substream_count = substream_count;
711         if (!substream_count)
712                 return 0;
713
714         snd_device_initialize(&pstr->dev, pcm->card);
715         pstr->dev.groups = pcm_dev_attr_groups;
716         dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
717                      stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
718
719         if (!pcm->internal) {
720                 err = snd_pcm_stream_proc_init(pstr);
721                 if (err < 0) {
722                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
723                         return err;
724                 }
725         }
726         prev = NULL;
727         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
728                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
729                 if (!substream)
730                         return -ENOMEM;
731                 substream->pcm = pcm;
732                 substream->pstr = pstr;
733                 substream->number = idx;
734                 substream->stream = stream;
735                 sprintf(substream->name, "subdevice #%i", idx);
736                 substream->buffer_bytes_max = UINT_MAX;
737                 if (prev == NULL)
738                         pstr->substream = substream;
739                 else
740                         prev->next = substream;
741
742                 if (!pcm->internal) {
743                         err = snd_pcm_substream_proc_init(substream);
744                         if (err < 0) {
745                                 pcm_err(pcm,
746                                         "Error in snd_pcm_stream_proc_init\n");
747                                 if (prev == NULL)
748                                         pstr->substream = NULL;
749                                 else
750                                         prev->next = NULL;
751                                 kfree(substream);
752                                 return err;
753                         }
754                 }
755                 substream->group = &substream->self_group;
756                 spin_lock_init(&substream->self_group.lock);
757                 mutex_init(&substream->self_group.mutex);
758                 INIT_LIST_HEAD(&substream->self_group.substreams);
759                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
760                 atomic_set(&substream->mmap_count, 0);
761                 prev = substream;
762         }
763         return 0;
764 }                               
765 EXPORT_SYMBOL(snd_pcm_new_stream);
766
767 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
768                 int playback_count, int capture_count, bool internal,
769                 struct snd_pcm **rpcm)
770 {
771         struct snd_pcm *pcm;
772         int err;
773         static struct snd_device_ops ops = {
774                 .dev_free = snd_pcm_dev_free,
775                 .dev_register = snd_pcm_dev_register,
776                 .dev_disconnect = snd_pcm_dev_disconnect,
777         };
778         static struct snd_device_ops internal_ops = {
779                 .dev_free = snd_pcm_dev_free,
780         };
781
782         if (snd_BUG_ON(!card))
783                 return -ENXIO;
784         if (rpcm)
785                 *rpcm = NULL;
786         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
787         if (!pcm)
788                 return -ENOMEM;
789         pcm->card = card;
790         pcm->device = device;
791         pcm->internal = internal;
792         mutex_init(&pcm->open_mutex);
793         init_waitqueue_head(&pcm->open_wait);
794         INIT_LIST_HEAD(&pcm->list);
795         if (id)
796                 strlcpy(pcm->id, id, sizeof(pcm->id));
797
798         err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
799                                  playback_count);
800         if (err < 0)
801                 goto free_pcm;
802
803         err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
804         if (err < 0)
805                 goto free_pcm;
806
807         err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
808                              internal ? &internal_ops : &ops);
809         if (err < 0)
810                 goto free_pcm;
811
812         if (rpcm)
813                 *rpcm = pcm;
814         return 0;
815
816 free_pcm:
817         snd_pcm_free(pcm);
818         return err;
819 }
820
821 /**
822  * snd_pcm_new - create a new PCM instance
823  * @card: the card instance
824  * @id: the id string
825  * @device: the device index (zero based)
826  * @playback_count: the number of substreams for playback
827  * @capture_count: the number of substreams for capture
828  * @rpcm: the pointer to store the new pcm instance
829  *
830  * Creates a new PCM instance.
831  *
832  * The pcm operators have to be set afterwards to the new instance
833  * via snd_pcm_set_ops().
834  *
835  * Return: Zero if successful, or a negative error code on failure.
836  */
837 int snd_pcm_new(struct snd_card *card, const char *id, int device,
838                 int playback_count, int capture_count, struct snd_pcm **rpcm)
839 {
840         return _snd_pcm_new(card, id, device, playback_count, capture_count,
841                         false, rpcm);
842 }
843 EXPORT_SYMBOL(snd_pcm_new);
844
845 /**
846  * snd_pcm_new_internal - create a new internal PCM instance
847  * @card: the card instance
848  * @id: the id string
849  * @device: the device index (zero based - shared with normal PCMs)
850  * @playback_count: the number of substreams for playback
851  * @capture_count: the number of substreams for capture
852  * @rpcm: the pointer to store the new pcm instance
853  *
854  * Creates a new internal PCM instance with no userspace device or procfs
855  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
856  * will only be used internally by kernel drivers. i.e. it cannot be opened
857  * by userspace. It provides existing ASoC components drivers with a substream
858  * and access to any private data.
859  *
860  * The pcm operators have to be set afterwards to the new instance
861  * via snd_pcm_set_ops().
862  *
863  * Return: Zero if successful, or a negative error code on failure.
864  */
865 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
866         int playback_count, int capture_count,
867         struct snd_pcm **rpcm)
868 {
869         return _snd_pcm_new(card, id, device, playback_count, capture_count,
870                         true, rpcm);
871 }
872 EXPORT_SYMBOL(snd_pcm_new_internal);
873
874 static void free_chmap(struct snd_pcm_str *pstr)
875 {
876         if (pstr->chmap_kctl) {
877                 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
878                 pstr->chmap_kctl = NULL;
879         }
880 }
881
882 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
883 {
884         struct snd_pcm_substream *substream, *substream_next;
885 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
886         struct snd_pcm_oss_setup *setup, *setupn;
887 #endif
888         substream = pstr->substream;
889         while (substream) {
890                 substream_next = substream->next;
891                 snd_pcm_timer_done(substream);
892                 snd_pcm_substream_proc_done(substream);
893                 kfree(substream);
894                 substream = substream_next;
895         }
896         snd_pcm_stream_proc_done(pstr);
897 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
898         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
899                 setupn = setup->next;
900                 kfree(setup->task_name);
901                 kfree(setup);
902         }
903 #endif
904         free_chmap(pstr);
905         if (pstr->substream_count)
906                 put_device(&pstr->dev);
907 }
908
909 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
910 #define pcm_call_notify(pcm, call)                                      \
911         do {                                                            \
912                 struct snd_pcm_notify *_notify;                         \
913                 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
914                         _notify->call(pcm);                             \
915         } while (0)
916 #else
917 #define pcm_call_notify(pcm, call) do {} while (0)
918 #endif
919
920 static int snd_pcm_free(struct snd_pcm *pcm)
921 {
922         if (!pcm)
923                 return 0;
924         if (!pcm->internal)
925                 pcm_call_notify(pcm, n_unregister);
926         if (pcm->private_free)
927                 pcm->private_free(pcm);
928         snd_pcm_lib_preallocate_free_for_all(pcm);
929         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
930         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
931         kfree(pcm);
932         return 0;
933 }
934
935 static int snd_pcm_dev_free(struct snd_device *device)
936 {
937         struct snd_pcm *pcm = device->device_data;
938         return snd_pcm_free(pcm);
939 }
940
941 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
942                              struct file *file,
943                              struct snd_pcm_substream **rsubstream)
944 {
945         struct snd_pcm_str * pstr;
946         struct snd_pcm_substream *substream;
947         struct snd_pcm_runtime *runtime;
948         struct snd_card *card;
949         int prefer_subdevice;
950         size_t size;
951
952         if (snd_BUG_ON(!pcm || !rsubstream))
953                 return -ENXIO;
954         if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
955                        stream != SNDRV_PCM_STREAM_CAPTURE))
956                 return -EINVAL;
957         *rsubstream = NULL;
958         pstr = &pcm->streams[stream];
959         if (pstr->substream == NULL || pstr->substream_count == 0)
960                 return -ENODEV;
961
962         card = pcm->card;
963         prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
964
965         if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
966                 int opposite = !stream;
967
968                 for (substream = pcm->streams[opposite].substream; substream;
969                      substream = substream->next) {
970                         if (SUBSTREAM_BUSY(substream))
971                                 return -EAGAIN;
972                 }
973         }
974
975         if (file->f_flags & O_APPEND) {
976                 if (prefer_subdevice < 0) {
977                         if (pstr->substream_count > 1)
978                                 return -EINVAL; /* must be unique */
979                         substream = pstr->substream;
980                 } else {
981                         for (substream = pstr->substream; substream;
982                              substream = substream->next)
983                                 if (substream->number == prefer_subdevice)
984                                         break;
985                 }
986                 if (! substream)
987                         return -ENODEV;
988                 if (! SUBSTREAM_BUSY(substream))
989                         return -EBADFD;
990                 substream->ref_count++;
991                 *rsubstream = substream;
992                 return 0;
993         }
994
995         for (substream = pstr->substream; substream; substream = substream->next) {
996                 if (!SUBSTREAM_BUSY(substream) &&
997                     (prefer_subdevice == -1 ||
998                      substream->number == prefer_subdevice))
999                         break;
1000         }
1001         if (substream == NULL)
1002                 return -EAGAIN;
1003
1004         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
1005         if (runtime == NULL)
1006                 return -ENOMEM;
1007
1008         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
1009         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
1010         if (runtime->status == NULL) {
1011                 kfree(runtime);
1012                 return -ENOMEM;
1013         }
1014         memset((void*)runtime->status, 0, size);
1015
1016         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1017         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
1018         if (runtime->control == NULL) {
1019                 snd_free_pages((void*)runtime->status,
1020                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1021                 kfree(runtime);
1022                 return -ENOMEM;
1023         }
1024         memset((void*)runtime->control, 0, size);
1025
1026         init_waitqueue_head(&runtime->sleep);
1027         init_waitqueue_head(&runtime->tsleep);
1028
1029         runtime->status->state = SNDRV_PCM_STATE_OPEN;
1030
1031         substream->runtime = runtime;
1032         substream->private_data = pcm->private_data;
1033         substream->ref_count = 1;
1034         substream->f_flags = file->f_flags;
1035         substream->pid = get_pid(task_pid(current));
1036         pstr->substream_opened++;
1037         *rsubstream = substream;
1038         return 0;
1039 }
1040
1041 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1042 {
1043         struct snd_pcm_runtime *runtime;
1044
1045         if (PCM_RUNTIME_CHECK(substream))
1046                 return;
1047         runtime = substream->runtime;
1048         if (runtime->private_free != NULL)
1049                 runtime->private_free(runtime);
1050         snd_free_pages((void*)runtime->status,
1051                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1052         snd_free_pages((void*)runtime->control,
1053                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1054         kfree(runtime->hw_constraints.rules);
1055         /* Avoid concurrent access to runtime via PCM timer interface */
1056         if (substream->timer)
1057                 spin_lock_irq(&substream->timer->lock);
1058         substream->runtime = NULL;
1059         if (substream->timer)
1060                 spin_unlock_irq(&substream->timer->lock);
1061         kfree(runtime);
1062         put_pid(substream->pid);
1063         substream->pid = NULL;
1064         substream->pstr->substream_opened--;
1065 }
1066
1067 static ssize_t show_pcm_class(struct device *dev,
1068                               struct device_attribute *attr, char *buf)
1069 {
1070         struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1071         struct snd_pcm *pcm = pstr->pcm;
1072         const char *str;
1073         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1074                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1075                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1076                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1077                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1078         };
1079
1080         if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1081                 str = "none";
1082         else
1083                 str = strs[pcm->dev_class];
1084         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1085 }
1086
1087 static DEVICE_ATTR(pcm_class, 0444, show_pcm_class, NULL);
1088 static struct attribute *pcm_dev_attrs[] = {
1089         &dev_attr_pcm_class.attr,
1090         NULL
1091 };
1092
1093 static const struct attribute_group pcm_dev_attr_group = {
1094         .attrs  = pcm_dev_attrs,
1095 };
1096
1097 static const struct attribute_group *pcm_dev_attr_groups[] = {
1098         &pcm_dev_attr_group,
1099         NULL
1100 };
1101
1102 static int snd_pcm_dev_register(struct snd_device *device)
1103 {
1104         int cidx, err;
1105         struct snd_pcm_substream *substream;
1106         struct snd_pcm *pcm;
1107
1108         if (snd_BUG_ON(!device || !device->device_data))
1109                 return -ENXIO;
1110         pcm = device->device_data;
1111
1112         mutex_lock(&register_mutex);
1113         err = snd_pcm_add(pcm);
1114         if (err)
1115                 goto unlock;
1116         for (cidx = 0; cidx < 2; cidx++) {
1117                 int devtype = -1;
1118                 if (pcm->streams[cidx].substream == NULL)
1119                         continue;
1120                 switch (cidx) {
1121                 case SNDRV_PCM_STREAM_PLAYBACK:
1122                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1123                         break;
1124                 case SNDRV_PCM_STREAM_CAPTURE:
1125                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1126                         break;
1127                 }
1128                 /* register pcm */
1129                 err = snd_register_device(devtype, pcm->card, pcm->device,
1130                                           &snd_pcm_f_ops[cidx], pcm,
1131                                           &pcm->streams[cidx].dev);
1132                 if (err < 0) {
1133                         list_del_init(&pcm->list);
1134                         goto unlock;
1135                 }
1136
1137                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1138                         snd_pcm_timer_init(substream);
1139         }
1140
1141         pcm_call_notify(pcm, n_register);
1142
1143  unlock:
1144         mutex_unlock(&register_mutex);
1145         return err;
1146 }
1147
1148 static int snd_pcm_dev_disconnect(struct snd_device *device)
1149 {
1150         struct snd_pcm *pcm = device->device_data;
1151         struct snd_pcm_substream *substream;
1152         int cidx;
1153
1154         mutex_lock(&register_mutex);
1155         mutex_lock(&pcm->open_mutex);
1156         wake_up(&pcm->open_wait);
1157         list_del_init(&pcm->list);
1158         for (cidx = 0; cidx < 2; cidx++) {
1159                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1160                         snd_pcm_stream_lock_irq(substream);
1161                         if (substream->runtime) {
1162                                 if (snd_pcm_running(substream))
1163                                         snd_pcm_stop(substream,
1164                                                      SNDRV_PCM_STATE_DISCONNECTED);
1165                                 /* to be sure, set the state unconditionally */
1166                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1167                                 wake_up(&substream->runtime->sleep);
1168                                 wake_up(&substream->runtime->tsleep);
1169                         }
1170                         snd_pcm_stream_unlock_irq(substream);
1171                 }
1172         }
1173
1174         pcm_call_notify(pcm, n_disconnect);
1175         for (cidx = 0; cidx < 2; cidx++) {
1176                 snd_unregister_device(&pcm->streams[cidx].dev);
1177                 free_chmap(&pcm->streams[cidx]);
1178         }
1179         mutex_unlock(&pcm->open_mutex);
1180         mutex_unlock(&register_mutex);
1181         return 0;
1182 }
1183
1184 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
1185 /**
1186  * snd_pcm_notify - Add/remove the notify list
1187  * @notify: PCM notify list
1188  * @nfree: 0 = register, 1 = unregister
1189  *
1190  * This adds the given notifier to the global list so that the callback is
1191  * called for each registered PCM devices.  This exists only for PCM OSS
1192  * emulation, so far.
1193  */
1194 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1195 {
1196         struct snd_pcm *pcm;
1197
1198         if (snd_BUG_ON(!notify ||
1199                        !notify->n_register ||
1200                        !notify->n_unregister ||
1201                        !notify->n_disconnect))
1202                 return -EINVAL;
1203         mutex_lock(&register_mutex);
1204         if (nfree) {
1205                 list_del(&notify->list);
1206                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1207                         notify->n_unregister(pcm);
1208         } else {
1209                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1210                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1211                         notify->n_register(pcm);
1212         }
1213         mutex_unlock(&register_mutex);
1214         return 0;
1215 }
1216 EXPORT_SYMBOL(snd_pcm_notify);
1217 #endif /* CONFIG_SND_PCM_OSS */
1218
1219 #ifdef CONFIG_SND_PROC_FS
1220 /*
1221  *  Info interface
1222  */
1223
1224 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1225                               struct snd_info_buffer *buffer)
1226 {
1227         struct snd_pcm *pcm;
1228
1229         mutex_lock(&register_mutex);
1230         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1231                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1232                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1233                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1234                         snd_iprintf(buffer, " : playback %i",
1235                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1236                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1237                         snd_iprintf(buffer, " : capture %i",
1238                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1239                 snd_iprintf(buffer, "\n");
1240         }
1241         mutex_unlock(&register_mutex);
1242 }
1243
1244 static struct snd_info_entry *snd_pcm_proc_entry;
1245
1246 static void snd_pcm_proc_init(void)
1247 {
1248         struct snd_info_entry *entry;
1249
1250         entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1251         if (entry) {
1252                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1253                 if (snd_info_register(entry) < 0) {
1254                         snd_info_free_entry(entry);
1255                         entry = NULL;
1256                 }
1257         }
1258         snd_pcm_proc_entry = entry;
1259 }
1260
1261 static void snd_pcm_proc_done(void)
1262 {
1263         snd_info_free_entry(snd_pcm_proc_entry);
1264 }
1265
1266 #else /* !CONFIG_SND_PROC_FS */
1267 #define snd_pcm_proc_init()
1268 #define snd_pcm_proc_done()
1269 #endif /* CONFIG_SND_PROC_FS */
1270
1271
1272 /*
1273  *  ENTRY functions
1274  */
1275
1276 static int __init alsa_pcm_init(void)
1277 {
1278         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1279         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1280         snd_pcm_proc_init();
1281         return 0;
1282 }
1283
1284 static void __exit alsa_pcm_exit(void)
1285 {
1286         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1287         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1288         snd_pcm_proc_done();
1289 }
1290
1291 module_init(alsa_pcm_init)
1292 module_exit(alsa_pcm_exit)