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TOMOYO Linux Cross Reference
Linux/sound/core/pcm.c

Version: ~ [ linux-5.14-rc3 ] ~ [ linux-5.13.5 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.53 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.135 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.198 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.240 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.276 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.276 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Digital Audio (PCM) abstract layer
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <linux/init.h>
 23 #include <linux/slab.h>
 24 #include <linux/module.h>
 25 #include <linux/time.h>
 26 #include <linux/mutex.h>
 27 #include <linux/device.h>
 28 #include <sound/core.h>
 29 #include <sound/minors.h>
 30 #include <sound/pcm.h>
 31 #include <sound/control.h>
 32 #include <sound/info.h>
 33 
 34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
 35 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
 36 MODULE_LICENSE("GPL");
 37 
 38 static LIST_HEAD(snd_pcm_devices);
 39 static LIST_HEAD(snd_pcm_notify_list);
 40 static DEFINE_MUTEX(register_mutex);
 41 
 42 static int snd_pcm_free(struct snd_pcm *pcm);
 43 static int snd_pcm_dev_free(struct snd_device *device);
 44 static int snd_pcm_dev_register(struct snd_device *device);
 45 static int snd_pcm_dev_disconnect(struct snd_device *device);
 46 
 47 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
 48 {
 49         struct snd_pcm *pcm;
 50 
 51         list_for_each_entry(pcm, &snd_pcm_devices, list) {
 52                 if (pcm->internal)
 53                         continue;
 54                 if (pcm->card == card && pcm->device == device)
 55                         return pcm;
 56         }
 57         return NULL;
 58 }
 59 
 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 
 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 
 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(&register_mutex);
105                         device = snd_pcm_next(card, device);
106                         mutex_unlock(&register_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(&register_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                         mutex_lock(&pcm->open_mutex);
154                         err = snd_pcm_info_user(substream, info);
155                         mutex_unlock(&pcm->open_mutex);
156                 _error:
157                         mutex_unlock(&register_mutex);
158                         return err;
159                 }
160         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
161                 {
162                         int val;
163                         
164                         if (get_user(val, (int __user *)arg))
165                                 return -EFAULT;
166                         control->prefer_pcm_subdevice = val;
167                         return 0;
168                 }
169         }
170         return -ENOIOCTLCMD;
171 }
172 
173 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
174 
175 static char *snd_pcm_format_names[] = {
176         FORMAT(S8),
177         FORMAT(U8),
178         FORMAT(S16_LE),
179         FORMAT(S16_BE),
180         FORMAT(U16_LE),
181         FORMAT(U16_BE),
182         FORMAT(S24_LE),
183         FORMAT(S24_BE),
184         FORMAT(U24_LE),
185         FORMAT(U24_BE),
186         FORMAT(S32_LE),
187         FORMAT(S32_BE),
188         FORMAT(U32_LE),
189         FORMAT(U32_BE),
190         FORMAT(FLOAT_LE),
191         FORMAT(FLOAT_BE),
192         FORMAT(FLOAT64_LE),
193         FORMAT(FLOAT64_BE),
194         FORMAT(IEC958_SUBFRAME_LE),
195         FORMAT(IEC958_SUBFRAME_BE),
196         FORMAT(MU_LAW),
197         FORMAT(A_LAW),
198         FORMAT(IMA_ADPCM),
199         FORMAT(MPEG),
200         FORMAT(GSM),
201         FORMAT(SPECIAL),
202         FORMAT(S24_3LE),
203         FORMAT(S24_3BE),
204         FORMAT(U24_3LE),
205         FORMAT(U24_3BE),
206         FORMAT(S20_3LE),
207         FORMAT(S20_3BE),
208         FORMAT(U20_3LE),
209         FORMAT(U20_3BE),
210         FORMAT(S18_3LE),
211         FORMAT(S18_3BE),
212         FORMAT(U18_3LE),
213         FORMAT(U18_3BE),
214         FORMAT(G723_24),
215         FORMAT(G723_24_1B),
216         FORMAT(G723_40),
217         FORMAT(G723_40_1B),
218         FORMAT(DSD_U8),
219         FORMAT(DSD_U16_LE),
220         FORMAT(DSD_U32_LE),
221         FORMAT(DSD_U16_BE),
222         FORMAT(DSD_U32_BE),
223 };
224 
225 /**
226  * snd_pcm_format_name - Return a name string for the given PCM format
227  * @format: PCM format
228  */
229 const char *snd_pcm_format_name(snd_pcm_format_t format)
230 {
231         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
232                 return "Unknown";
233         return snd_pcm_format_names[(__force unsigned int)format];
234 }
235 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
236 
237 #ifdef CONFIG_SND_VERBOSE_PROCFS
238 
239 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
240 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
241 #define READY(v) [SNDRV_PCM_READY_##v] = #v
242 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
243 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
244 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
245 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
246 #define START(v) [SNDRV_PCM_START_##v] = #v
247 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
248 
249 static char *snd_pcm_stream_names[] = {
250         STREAM(PLAYBACK),
251         STREAM(CAPTURE),
252 };
253 
254 static char *snd_pcm_state_names[] = {
255         STATE(OPEN),
256         STATE(SETUP),
257         STATE(PREPARED),
258         STATE(RUNNING),
259         STATE(XRUN),
260         STATE(DRAINING),
261         STATE(PAUSED),
262         STATE(SUSPENDED),
263 };
264 
265 static char *snd_pcm_access_names[] = {
266         ACCESS(MMAP_INTERLEAVED), 
267         ACCESS(MMAP_NONINTERLEAVED),
268         ACCESS(MMAP_COMPLEX),
269         ACCESS(RW_INTERLEAVED),
270         ACCESS(RW_NONINTERLEAVED),
271 };
272 
273 static char *snd_pcm_subformat_names[] = {
274         SUBFORMAT(STD), 
275 };
276 
277 static char *snd_pcm_tstamp_mode_names[] = {
278         TSTAMP(NONE),
279         TSTAMP(ENABLE),
280 };
281 
282 static const char *snd_pcm_stream_name(int stream)
283 {
284         return snd_pcm_stream_names[stream];
285 }
286 
287 static const char *snd_pcm_access_name(snd_pcm_access_t access)
288 {
289         return snd_pcm_access_names[(__force int)access];
290 }
291 
292 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
293 {
294         return snd_pcm_subformat_names[(__force int)subformat];
295 }
296 
297 static const char *snd_pcm_tstamp_mode_name(int mode)
298 {
299         return snd_pcm_tstamp_mode_names[mode];
300 }
301 
302 static const char *snd_pcm_state_name(snd_pcm_state_t state)
303 {
304         return snd_pcm_state_names[(__force int)state];
305 }
306 
307 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
308 #include <linux/soundcard.h>
309 
310 static const char *snd_pcm_oss_format_name(int format)
311 {
312         switch (format) {
313         case AFMT_MU_LAW:
314                 return "MU_LAW";
315         case AFMT_A_LAW:
316                 return "A_LAW";
317         case AFMT_IMA_ADPCM:
318                 return "IMA_ADPCM";
319         case AFMT_U8:
320                 return "U8";
321         case AFMT_S16_LE:
322                 return "S16_LE";
323         case AFMT_S16_BE:
324                 return "S16_BE";
325         case AFMT_S8:
326                 return "S8";
327         case AFMT_U16_LE:
328                 return "U16_LE";
329         case AFMT_U16_BE:
330                 return "U16_BE";
331         case AFMT_MPEG:
332                 return "MPEG";
333         default:
334                 return "unknown";
335         }
336 }
337 #endif
338 
339 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
340                                    struct snd_info_buffer *buffer)
341 {
342         struct snd_pcm_info *info;
343         int err;
344 
345         if (! substream)
346                 return;
347 
348         info = kmalloc(sizeof(*info), GFP_KERNEL);
349         if (! info) {
350                 pcm_dbg(substream->pcm,
351                         "snd_pcm_proc_info_read: cannot malloc\n");
352                 return;
353         }
354 
355         err = snd_pcm_info(substream, info);
356         if (err < 0) {
357                 snd_iprintf(buffer, "error %d\n", err);
358                 kfree(info);
359                 return;
360         }
361         snd_iprintf(buffer, "card: %d\n", info->card);
362         snd_iprintf(buffer, "device: %d\n", info->device);
363         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
364         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
365         snd_iprintf(buffer, "id: %s\n", info->id);
366         snd_iprintf(buffer, "name: %s\n", info->name);
367         snd_iprintf(buffer, "subname: %s\n", info->subname);
368         snd_iprintf(buffer, "class: %d\n", info->dev_class);
369         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
370         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
371         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
372         kfree(info);
373 }
374 
375 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
376                                           struct snd_info_buffer *buffer)
377 {
378         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
379                                buffer);
380 }
381 
382 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
383                                              struct snd_info_buffer *buffer)
384 {
385         snd_pcm_proc_info_read(entry->private_data, buffer);
386 }
387 
388 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
389                                                   struct snd_info_buffer *buffer)
390 {
391         struct snd_pcm_substream *substream = entry->private_data;
392         struct snd_pcm_runtime *runtime;
393 
394         mutex_lock(&substream->pcm->open_mutex);
395         runtime = substream->runtime;
396         if (!runtime) {
397                 snd_iprintf(buffer, "closed\n");
398                 goto unlock;
399         }
400         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
401                 snd_iprintf(buffer, "no setup\n");
402                 goto unlock;
403         }
404         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
405         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
406         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
407         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
408         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
409         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
410         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
411 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
412         if (substream->oss.oss) {
413                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
414                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
415                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
416                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
417                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
418                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
419         }
420 #endif
421  unlock:
422         mutex_unlock(&substream->pcm->open_mutex);
423 }
424 
425 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
426                                                   struct snd_info_buffer *buffer)
427 {
428         struct snd_pcm_substream *substream = entry->private_data;
429         struct snd_pcm_runtime *runtime;
430 
431         mutex_lock(&substream->pcm->open_mutex);
432         runtime = substream->runtime;
433         if (!runtime) {
434                 snd_iprintf(buffer, "closed\n");
435                 goto unlock;
436         }
437         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
438                 snd_iprintf(buffer, "no setup\n");
439                 goto unlock;
440         }
441         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
442         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
443         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
444         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
445         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
446         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
447         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
448         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
449  unlock:
450         mutex_unlock(&substream->pcm->open_mutex);
451 }
452 
453 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
454                                                struct snd_info_buffer *buffer)
455 {
456         struct snd_pcm_substream *substream = entry->private_data;
457         struct snd_pcm_runtime *runtime;
458         struct snd_pcm_status status;
459         int err;
460 
461         mutex_lock(&substream->pcm->open_mutex);
462         runtime = substream->runtime;
463         if (!runtime) {
464                 snd_iprintf(buffer, "closed\n");
465                 goto unlock;
466         }
467         memset(&status, 0, sizeof(status));
468         err = snd_pcm_status(substream, &status);
469         if (err < 0) {
470                 snd_iprintf(buffer, "error %d\n", err);
471                 goto unlock;
472         }
473         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
474         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
475         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
476                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
477         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
478                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
479         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
480         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
481         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
482         snd_iprintf(buffer, "-----\n");
483         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
484         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
485  unlock:
486         mutex_unlock(&substream->pcm->open_mutex);
487 }
488 
489 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
490 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
491                                     struct snd_info_buffer *buffer)
492 {
493         struct snd_pcm_str *pstr = entry->private_data;
494         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
495 }
496 
497 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
498                                      struct snd_info_buffer *buffer)
499 {
500         struct snd_pcm_str *pstr = entry->private_data;
501         char line[64];
502         if (!snd_info_get_line(buffer, line, sizeof(line)))
503                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
504 }
505 #endif
506 
507 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
508 {
509         struct snd_pcm *pcm = pstr->pcm;
510         struct snd_info_entry *entry;
511         char name[16];
512 
513         sprintf(name, "pcm%i%c", pcm->device, 
514                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
515         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
516                 return -ENOMEM;
517         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
518         if (snd_info_register(entry) < 0) {
519                 snd_info_free_entry(entry);
520                 return -ENOMEM;
521         }
522         pstr->proc_root = entry;
523 
524         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
525                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
526                 if (snd_info_register(entry) < 0) {
527                         snd_info_free_entry(entry);
528                         entry = NULL;
529                 }
530         }
531         pstr->proc_info_entry = entry;
532 
533 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
534         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
535                                                 pstr->proc_root)) != NULL) {
536                 entry->c.text.read = snd_pcm_xrun_debug_read;
537                 entry->c.text.write = snd_pcm_xrun_debug_write;
538                 entry->mode |= S_IWUSR;
539                 entry->private_data = pstr;
540                 if (snd_info_register(entry) < 0) {
541                         snd_info_free_entry(entry);
542                         entry = NULL;
543                 }
544         }
545         pstr->proc_xrun_debug_entry = entry;
546 #endif
547         return 0;
548 }
549 
550 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
551 {
552 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
553         snd_info_free_entry(pstr->proc_xrun_debug_entry);
554         pstr->proc_xrun_debug_entry = NULL;
555 #endif
556         snd_info_free_entry(pstr->proc_info_entry);
557         pstr->proc_info_entry = NULL;
558         snd_info_free_entry(pstr->proc_root);
559         pstr->proc_root = NULL;
560         return 0;
561 }
562 
563 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
564 {
565         struct snd_info_entry *entry;
566         struct snd_card *card;
567         char name[16];
568 
569         card = substream->pcm->card;
570 
571         sprintf(name, "sub%i", substream->number);
572         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
573                 return -ENOMEM;
574         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
575         if (snd_info_register(entry) < 0) {
576                 snd_info_free_entry(entry);
577                 return -ENOMEM;
578         }
579         substream->proc_root = entry;
580 
581         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
582                 snd_info_set_text_ops(entry, substream,
583                                       snd_pcm_substream_proc_info_read);
584                 if (snd_info_register(entry) < 0) {
585                         snd_info_free_entry(entry);
586                         entry = NULL;
587                 }
588         }
589         substream->proc_info_entry = entry;
590 
591         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
592                 snd_info_set_text_ops(entry, substream,
593                                       snd_pcm_substream_proc_hw_params_read);
594                 if (snd_info_register(entry) < 0) {
595                         snd_info_free_entry(entry);
596                         entry = NULL;
597                 }
598         }
599         substream->proc_hw_params_entry = entry;
600 
601         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
602                 snd_info_set_text_ops(entry, substream,
603                                       snd_pcm_substream_proc_sw_params_read);
604                 if (snd_info_register(entry) < 0) {
605                         snd_info_free_entry(entry);
606                         entry = NULL;
607                 }
608         }
609         substream->proc_sw_params_entry = entry;
610 
611         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
612                 snd_info_set_text_ops(entry, substream,
613                                       snd_pcm_substream_proc_status_read);
614                 if (snd_info_register(entry) < 0) {
615                         snd_info_free_entry(entry);
616                         entry = NULL;
617                 }
618         }
619         substream->proc_status_entry = entry;
620 
621         return 0;
622 }
623 
624 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
625 {
626         snd_info_free_entry(substream->proc_info_entry);
627         substream->proc_info_entry = NULL;
628         snd_info_free_entry(substream->proc_hw_params_entry);
629         substream->proc_hw_params_entry = NULL;
630         snd_info_free_entry(substream->proc_sw_params_entry);
631         substream->proc_sw_params_entry = NULL;
632         snd_info_free_entry(substream->proc_status_entry);
633         substream->proc_status_entry = NULL;
634         snd_info_free_entry(substream->proc_root);
635         substream->proc_root = NULL;
636         return 0;
637 }
638 #else /* !CONFIG_SND_VERBOSE_PROCFS */
639 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
640 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
641 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
642 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
643 #endif /* CONFIG_SND_VERBOSE_PROCFS */
644 
645 /**
646  * snd_pcm_new_stream - create a new PCM stream
647  * @pcm: the pcm instance
648  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
649  * @substream_count: the number of substreams
650  *
651  * Creates a new stream for the pcm.
652  * The corresponding stream on the pcm must have been empty before
653  * calling this, i.e. zero must be given to the argument of
654  * snd_pcm_new().
655  *
656  * Return: Zero if successful, or a negative error code on failure.
657  */
658 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
659 {
660         int idx, err;
661         struct snd_pcm_str *pstr = &pcm->streams[stream];
662         struct snd_pcm_substream *substream, *prev;
663 
664 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
665         mutex_init(&pstr->oss.setup_mutex);
666 #endif
667         pstr->stream = stream;
668         pstr->pcm = pcm;
669         pstr->substream_count = substream_count;
670         if (substream_count > 0 && !pcm->internal) {
671                 err = snd_pcm_stream_proc_init(pstr);
672                 if (err < 0) {
673                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
674                         return err;
675                 }
676         }
677         prev = NULL;
678         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
679                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
680                 if (substream == NULL) {
681                         pcm_err(pcm, "Cannot allocate PCM substream\n");
682                         return -ENOMEM;
683                 }
684                 substream->pcm = pcm;
685                 substream->pstr = pstr;
686                 substream->number = idx;
687                 substream->stream = stream;
688                 sprintf(substream->name, "subdevice #%i", idx);
689                 substream->buffer_bytes_max = UINT_MAX;
690                 if (prev == NULL)
691                         pstr->substream = substream;
692                 else
693                         prev->next = substream;
694 
695                 if (!pcm->internal) {
696                         err = snd_pcm_substream_proc_init(substream);
697                         if (err < 0) {
698                                 pcm_err(pcm,
699                                         "Error in snd_pcm_stream_proc_init\n");
700                                 if (prev == NULL)
701                                         pstr->substream = NULL;
702                                 else
703                                         prev->next = NULL;
704                                 kfree(substream);
705                                 return err;
706                         }
707                 }
708                 substream->group = &substream->self_group;
709                 spin_lock_init(&substream->self_group.lock);
710                 mutex_init(&substream->self_group.mutex);
711                 INIT_LIST_HEAD(&substream->self_group.substreams);
712                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
713                 atomic_set(&substream->mmap_count, 0);
714                 prev = substream;
715         }
716         return 0;
717 }                               
718 EXPORT_SYMBOL(snd_pcm_new_stream);
719 
720 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
721                 int playback_count, int capture_count, bool internal,
722                 struct snd_pcm **rpcm)
723 {
724         struct snd_pcm *pcm;
725         int err;
726         static struct snd_device_ops ops = {
727                 .dev_free = snd_pcm_dev_free,
728                 .dev_register = snd_pcm_dev_register,
729                 .dev_disconnect = snd_pcm_dev_disconnect,
730         };
731 
732         if (snd_BUG_ON(!card))
733                 return -ENXIO;
734         if (rpcm)
735                 *rpcm = NULL;
736         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
737         if (pcm == NULL) {
738                 dev_err(card->dev, "Cannot allocate PCM\n");
739                 return -ENOMEM;
740         }
741         pcm->card = card;
742         pcm->device = device;
743         pcm->internal = internal;
744         if (id)
745                 strlcpy(pcm->id, id, sizeof(pcm->id));
746         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
747                 snd_pcm_free(pcm);
748                 return err;
749         }
750         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
751                 snd_pcm_free(pcm);
752                 return err;
753         }
754         mutex_init(&pcm->open_mutex);
755         init_waitqueue_head(&pcm->open_wait);
756         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
757                 snd_pcm_free(pcm);
758                 return err;
759         }
760         if (rpcm)
761                 *rpcm = pcm;
762         return 0;
763 }
764 
765 /**
766  * snd_pcm_new - create a new PCM instance
767  * @card: the card instance
768  * @id: the id string
769  * @device: the device index (zero based)
770  * @playback_count: the number of substreams for playback
771  * @capture_count: the number of substreams for capture
772  * @rpcm: the pointer to store the new pcm instance
773  *
774  * Creates a new PCM instance.
775  *
776  * The pcm operators have to be set afterwards to the new instance
777  * via snd_pcm_set_ops().
778  *
779  * Return: Zero if successful, or a negative error code on failure.
780  */
781 int snd_pcm_new(struct snd_card *card, const char *id, int device,
782                 int playback_count, int capture_count, struct snd_pcm **rpcm)
783 {
784         return _snd_pcm_new(card, id, device, playback_count, capture_count,
785                         false, rpcm);
786 }
787 EXPORT_SYMBOL(snd_pcm_new);
788 
789 /**
790  * snd_pcm_new_internal - create a new internal PCM instance
791  * @card: the card instance
792  * @id: the id string
793  * @device: the device index (zero based - shared with normal PCMs)
794  * @playback_count: the number of substreams for playback
795  * @capture_count: the number of substreams for capture
796  * @rpcm: the pointer to store the new pcm instance
797  *
798  * Creates a new internal PCM instance with no userspace device or procfs
799  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
800  * will only be used internally by kernel drivers. i.e. it cannot be opened
801  * by userspace. It provides existing ASoC components drivers with a substream
802  * and access to any private data.
803  *
804  * The pcm operators have to be set afterwards to the new instance
805  * via snd_pcm_set_ops().
806  *
807  * Return: Zero if successful, or a negative error code on failure.
808  */
809 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
810         int playback_count, int capture_count,
811         struct snd_pcm **rpcm)
812 {
813         return _snd_pcm_new(card, id, device, playback_count, capture_count,
814                         true, rpcm);
815 }
816 EXPORT_SYMBOL(snd_pcm_new_internal);
817 
818 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
819 {
820         struct snd_pcm_substream *substream, *substream_next;
821 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
822         struct snd_pcm_oss_setup *setup, *setupn;
823 #endif
824         substream = pstr->substream;
825         while (substream) {
826                 substream_next = substream->next;
827                 snd_pcm_timer_done(substream);
828                 snd_pcm_substream_proc_done(substream);
829                 kfree(substream);
830                 substream = substream_next;
831         }
832         snd_pcm_stream_proc_done(pstr);
833 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
834         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
835                 setupn = setup->next;
836                 kfree(setup->task_name);
837                 kfree(setup);
838         }
839 #endif
840 }
841 
842 static int snd_pcm_free(struct snd_pcm *pcm)
843 {
844         struct snd_pcm_notify *notify;
845 
846         if (!pcm)
847                 return 0;
848         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
849                 notify->n_unregister(pcm);
850         }
851         if (pcm->private_free)
852                 pcm->private_free(pcm);
853         snd_pcm_lib_preallocate_free_for_all(pcm);
854         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
855         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
856         kfree(pcm);
857         return 0;
858 }
859 
860 static int snd_pcm_dev_free(struct snd_device *device)
861 {
862         struct snd_pcm *pcm = device->device_data;
863         return snd_pcm_free(pcm);
864 }
865 
866 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
867                              struct file *file,
868                              struct snd_pcm_substream **rsubstream)
869 {
870         struct snd_pcm_str * pstr;
871         struct snd_pcm_substream *substream;
872         struct snd_pcm_runtime *runtime;
873         struct snd_ctl_file *kctl;
874         struct snd_card *card;
875         int prefer_subdevice = -1;
876         size_t size;
877 
878         if (snd_BUG_ON(!pcm || !rsubstream))
879                 return -ENXIO;
880         *rsubstream = NULL;
881         pstr = &pcm->streams[stream];
882         if (pstr->substream == NULL || pstr->substream_count == 0)
883                 return -ENODEV;
884 
885         card = pcm->card;
886         read_lock(&card->ctl_files_rwlock);
887         list_for_each_entry(kctl, &card->ctl_files, list) {
888                 if (kctl->pid == task_pid(current)) {
889                         prefer_subdevice = kctl->prefer_pcm_subdevice;
890                         if (prefer_subdevice != -1)
891                                 break;
892                 }
893         }
894         read_unlock(&card->ctl_files_rwlock);
895 
896         switch (stream) {
897         case SNDRV_PCM_STREAM_PLAYBACK:
898                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
899                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
900                                 if (SUBSTREAM_BUSY(substream))
901                                         return -EAGAIN;
902                         }
903                 }
904                 break;
905         case SNDRV_PCM_STREAM_CAPTURE:
906                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
907                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
908                                 if (SUBSTREAM_BUSY(substream))
909                                         return -EAGAIN;
910                         }
911                 }
912                 break;
913         default:
914                 return -EINVAL;
915         }
916 
917         if (file->f_flags & O_APPEND) {
918                 if (prefer_subdevice < 0) {
919                         if (pstr->substream_count > 1)
920                                 return -EINVAL; /* must be unique */
921                         substream = pstr->substream;
922                 } else {
923                         for (substream = pstr->substream; substream;
924                              substream = substream->next)
925                                 if (substream->number == prefer_subdevice)
926                                         break;
927                 }
928                 if (! substream)
929                         return -ENODEV;
930                 if (! SUBSTREAM_BUSY(substream))
931                         return -EBADFD;
932                 substream->ref_count++;
933                 *rsubstream = substream;
934                 return 0;
935         }
936 
937         if (prefer_subdevice >= 0) {
938                 for (substream = pstr->substream; substream; substream = substream->next)
939                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
940                                 goto __ok;
941         }
942         for (substream = pstr->substream; substream; substream = substream->next)
943                 if (!SUBSTREAM_BUSY(substream))
944                         break;
945       __ok:
946         if (substream == NULL)
947                 return -EAGAIN;
948 
949         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
950         if (runtime == NULL)
951                 return -ENOMEM;
952 
953         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
954         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
955         if (runtime->status == NULL) {
956                 kfree(runtime);
957                 return -ENOMEM;
958         }
959         memset((void*)runtime->status, 0, size);
960 
961         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
962         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
963         if (runtime->control == NULL) {
964                 snd_free_pages((void*)runtime->status,
965                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
966                 kfree(runtime);
967                 return -ENOMEM;
968         }
969         memset((void*)runtime->control, 0, size);
970 
971         init_waitqueue_head(&runtime->sleep);
972         init_waitqueue_head(&runtime->tsleep);
973 
974         runtime->status->state = SNDRV_PCM_STATE_OPEN;
975 
976         substream->runtime = runtime;
977         substream->private_data = pcm->private_data;
978         substream->ref_count = 1;
979         substream->f_flags = file->f_flags;
980         substream->pid = get_pid(task_pid(current));
981         pstr->substream_opened++;
982         *rsubstream = substream;
983         return 0;
984 }
985 
986 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
987 {
988         struct snd_pcm_runtime *runtime;
989 
990         if (PCM_RUNTIME_CHECK(substream))
991                 return;
992         runtime = substream->runtime;
993         if (runtime->private_free != NULL)
994                 runtime->private_free(runtime);
995         snd_free_pages((void*)runtime->status,
996                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
997         snd_free_pages((void*)runtime->control,
998                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
999         kfree(runtime->hw_constraints.rules);
1000 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
1001         kfree(runtime->hwptr_log);
1002 #endif
1003         kfree(runtime);
1004         substream->runtime = NULL;
1005         put_pid(substream->pid);
1006         substream->pid = NULL;
1007         substream->pstr->substream_opened--;
1008 }
1009 
1010 static ssize_t show_pcm_class(struct device *dev,
1011                               struct device_attribute *attr, char *buf)
1012 {
1013         struct snd_pcm *pcm;
1014         const char *str;
1015         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1016                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1017                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1018                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1019                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1020         };
1021 
1022         if (! (pcm = dev_get_drvdata(dev)) ||
1023             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1024                 str = "none";
1025         else
1026                 str = strs[pcm->dev_class];
1027         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1028 }
1029 
1030 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1031 static struct attribute *pcm_dev_attrs[] = {
1032         &dev_attr_pcm_class.attr,
1033         NULL
1034 };
1035 
1036 static struct attribute_group pcm_dev_attr_group = {
1037         .attrs  = pcm_dev_attrs,
1038 };
1039 
1040 static const struct attribute_group *pcm_dev_attr_groups[] = {
1041         &pcm_dev_attr_group,
1042         NULL
1043 };
1044 
1045 static int snd_pcm_dev_register(struct snd_device *device)
1046 {
1047         int cidx, err;
1048         struct snd_pcm_substream *substream;
1049         struct snd_pcm_notify *notify;
1050         char str[16];
1051         struct snd_pcm *pcm;
1052         struct device *dev;
1053 
1054         if (snd_BUG_ON(!device || !device->device_data))
1055                 return -ENXIO;
1056         pcm = device->device_data;
1057         mutex_lock(&register_mutex);
1058         err = snd_pcm_add(pcm);
1059         if (err) {
1060                 mutex_unlock(&register_mutex);
1061                 return err;
1062         }
1063         for (cidx = 0; cidx < 2; cidx++) {
1064                 int devtype = -1;
1065                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1066                         continue;
1067                 switch (cidx) {
1068                 case SNDRV_PCM_STREAM_PLAYBACK:
1069                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1070                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1071                         break;
1072                 case SNDRV_PCM_STREAM_CAPTURE:
1073                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1074                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1075                         break;
1076                 }
1077                 /* device pointer to use, pcm->dev takes precedence if
1078                  * it is assigned, otherwise fall back to card's device
1079                  * if possible */
1080                 dev = pcm->dev;
1081                 if (!dev)
1082                         dev = snd_card_get_device_link(pcm->card);
1083                 /* register pcm */
1084                 err = snd_register_device_for_dev(devtype, pcm->card,
1085                                                   pcm->device,
1086                                                   &snd_pcm_f_ops[cidx],
1087                                                   pcm, str, dev);
1088                 if (err < 0) {
1089                         list_del(&pcm->list);
1090                         mutex_unlock(&register_mutex);
1091                         return err;
1092                 }
1093 
1094                 dev = snd_get_device(devtype, pcm->card, pcm->device);
1095                 if (dev) {
1096                         err = sysfs_create_groups(&dev->kobj,
1097                                                   pcm_dev_attr_groups);
1098                         if (err < 0)
1099                                 dev_warn(dev,
1100                                          "pcm %d:%d: cannot create sysfs groups\n",
1101                                          pcm->card->number, pcm->device);
1102                         put_device(dev);
1103                 }
1104 
1105                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1106                         snd_pcm_timer_init(substream);
1107         }
1108 
1109         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1110                 notify->n_register(pcm);
1111 
1112         mutex_unlock(&register_mutex);
1113         return 0;
1114 }
1115 
1116 static int snd_pcm_dev_disconnect(struct snd_device *device)
1117 {
1118         struct snd_pcm *pcm = device->device_data;
1119         struct snd_pcm_notify *notify;
1120         struct snd_pcm_substream *substream;
1121         int cidx, devtype;
1122 
1123         mutex_lock(&register_mutex);
1124         if (list_empty(&pcm->list))
1125                 goto unlock;
1126 
1127         mutex_lock(&pcm->open_mutex);
1128         wake_up(&pcm->open_wait);
1129         list_del_init(&pcm->list);
1130         for (cidx = 0; cidx < 2; cidx++)
1131                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1132                         snd_pcm_stream_lock_irq(substream);
1133                         if (substream->runtime) {
1134                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1135                                 wake_up(&substream->runtime->sleep);
1136                                 wake_up(&substream->runtime->tsleep);
1137                         }
1138                         snd_pcm_stream_unlock_irq(substream);
1139                 }
1140         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1141                 notify->n_disconnect(pcm);
1142         }
1143         for (cidx = 0; cidx < 2; cidx++) {
1144                 devtype = -1;
1145                 switch (cidx) {
1146                 case SNDRV_PCM_STREAM_PLAYBACK:
1147                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1148                         break;
1149                 case SNDRV_PCM_STREAM_CAPTURE:
1150                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1151                         break;
1152                 }
1153                 snd_unregister_device(devtype, pcm->card, pcm->device);
1154                 if (pcm->streams[cidx].chmap_kctl) {
1155                         snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1156                         pcm->streams[cidx].chmap_kctl = NULL;
1157                 }
1158         }
1159         mutex_unlock(&pcm->open_mutex);
1160  unlock:
1161         mutex_unlock(&register_mutex);
1162         return 0;
1163 }
1164 
1165 /**
1166  * snd_pcm_notify - Add/remove the notify list
1167  * @notify: PCM notify list
1168  * @nfree: 0 = register, 1 = unregister
1169  *
1170  * This adds the given notifier to the global list so that the callback is
1171  * called for each registered PCM devices.  This exists only for PCM OSS
1172  * emulation, so far.
1173  */
1174 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1175 {
1176         struct snd_pcm *pcm;
1177 
1178         if (snd_BUG_ON(!notify ||
1179                        !notify->n_register ||
1180                        !notify->n_unregister ||
1181                        !notify->n_disconnect))
1182                 return -EINVAL;
1183         mutex_lock(&register_mutex);
1184         if (nfree) {
1185                 list_del(&notify->list);
1186                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1187                         notify->n_unregister(pcm);
1188         } else {
1189                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1190                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1191                         notify->n_register(pcm);
1192         }
1193         mutex_unlock(&register_mutex);
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(snd_pcm_notify);
1197 
1198 #ifdef CONFIG_PROC_FS
1199 /*
1200  *  Info interface
1201  */
1202 
1203 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1204                               struct snd_info_buffer *buffer)
1205 {
1206         struct snd_pcm *pcm;
1207 
1208         mutex_lock(&register_mutex);
1209         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1210                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1211                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1212                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1213                         snd_iprintf(buffer, " : playback %i",
1214                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1215                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1216                         snd_iprintf(buffer, " : capture %i",
1217                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1218                 snd_iprintf(buffer, "\n");
1219         }
1220         mutex_unlock(&register_mutex);
1221 }
1222 
1223 static struct snd_info_entry *snd_pcm_proc_entry;
1224 
1225 static void snd_pcm_proc_init(void)
1226 {
1227         struct snd_info_entry *entry;
1228 
1229         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1230                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1231                 if (snd_info_register(entry) < 0) {
1232                         snd_info_free_entry(entry);
1233                         entry = NULL;
1234                 }
1235         }
1236         snd_pcm_proc_entry = entry;
1237 }
1238 
1239 static void snd_pcm_proc_done(void)
1240 {
1241         snd_info_free_entry(snd_pcm_proc_entry);
1242 }
1243 
1244 #else /* !CONFIG_PROC_FS */
1245 #define snd_pcm_proc_init()
1246 #define snd_pcm_proc_done()
1247 #endif /* CONFIG_PROC_FS */
1248 
1249 
1250 /*
1251  *  ENTRY functions
1252  */
1253 
1254 static int __init alsa_pcm_init(void)
1255 {
1256         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1257         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1258         snd_pcm_proc_init();
1259         return 0;
1260 }
1261 
1262 static void __exit alsa_pcm_exit(void)
1263 {
1264         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1265         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1266         snd_pcm_proc_done();
1267 }
1268 
1269 module_init(alsa_pcm_init)
1270 module_exit(alsa_pcm_exit)
1271 

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