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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.14 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.72 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.143 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.192 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.192 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ 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->card == card && pcm->device == device)
 53                         return pcm;
 54         }
 55         return NULL;
 56 }
 57 
 58 static int snd_pcm_next(struct snd_card *card, int device)
 59 {
 60         struct snd_pcm *pcm;
 61 
 62         list_for_each_entry(pcm, &snd_pcm_devices, list) {
 63                 if (pcm->card == card && pcm->device > device)
 64                         return pcm->device;
 65                 else if (pcm->card->number > card->number)
 66                         return -1;
 67         }
 68         return -1;
 69 }
 70 
 71 static int snd_pcm_add(struct snd_pcm *newpcm)
 72 {
 73         struct snd_pcm *pcm;
 74 
 75         if (newpcm->internal)
 76                 return 0;
 77 
 78         list_for_each_entry(pcm, &snd_pcm_devices, list) {
 79                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
 80                         return -EBUSY;
 81                 if (pcm->card->number > newpcm->card->number ||
 82                                 (pcm->card == newpcm->card &&
 83                                 pcm->device > newpcm->device)) {
 84                         list_add(&newpcm->list, pcm->list.prev);
 85                         return 0;
 86                 }
 87         }
 88         list_add_tail(&newpcm->list, &snd_pcm_devices);
 89         return 0;
 90 }
 91 
 92 static int snd_pcm_control_ioctl(struct snd_card *card,
 93                                  struct snd_ctl_file *control,
 94                                  unsigned int cmd, unsigned long arg)
 95 {
 96         switch (cmd) {
 97         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
 98                 {
 99                         int device;
100 
101                         if (get_user(device, (int __user *)arg))
102                                 return -EFAULT;
103                         mutex_lock(&register_mutex);
104                         device = snd_pcm_next(card, device);
105                         mutex_unlock(&register_mutex);
106                         if (put_user(device, (int __user *)arg))
107                                 return -EFAULT;
108                         return 0;
109                 }
110         case SNDRV_CTL_IOCTL_PCM_INFO:
111                 {
112                         struct snd_pcm_info __user *info;
113                         unsigned int device, subdevice;
114                         int stream;
115                         struct snd_pcm *pcm;
116                         struct snd_pcm_str *pstr;
117                         struct snd_pcm_substream *substream;
118                         int err;
119 
120                         info = (struct snd_pcm_info __user *)arg;
121                         if (get_user(device, &info->device))
122                                 return -EFAULT;
123                         if (get_user(stream, &info->stream))
124                                 return -EFAULT;
125                         if (stream < 0 || stream > 1)
126                                 return -EINVAL;
127                         if (get_user(subdevice, &info->subdevice))
128                                 return -EFAULT;
129                         mutex_lock(&register_mutex);
130                         pcm = snd_pcm_get(card, device);
131                         if (pcm == NULL) {
132                                 err = -ENXIO;
133                                 goto _error;
134                         }
135                         pstr = &pcm->streams[stream];
136                         if (pstr->substream_count == 0) {
137                                 err = -ENOENT;
138                                 goto _error;
139                         }
140                         if (subdevice >= pstr->substream_count) {
141                                 err = -ENXIO;
142                                 goto _error;
143                         }
144                         for (substream = pstr->substream; substream;
145                              substream = substream->next)
146                                 if (substream->number == (int)subdevice)
147                                         break;
148                         if (substream == NULL) {
149                                 err = -ENXIO;
150                                 goto _error;
151                         }
152                         err = snd_pcm_info_user(substream, info);
153                 _error:
154                         mutex_unlock(&register_mutex);
155                         return err;
156                 }
157         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
158                 {
159                         int val;
160                         
161                         if (get_user(val, (int __user *)arg))
162                                 return -EFAULT;
163                         control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
164                         return 0;
165                 }
166         }
167         return -ENOIOCTLCMD;
168 }
169 
170 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
171 
172 static char *snd_pcm_format_names[] = {
173         FORMAT(S8),
174         FORMAT(U8),
175         FORMAT(S16_LE),
176         FORMAT(S16_BE),
177         FORMAT(U16_LE),
178         FORMAT(U16_BE),
179         FORMAT(S24_LE),
180         FORMAT(S24_BE),
181         FORMAT(U24_LE),
182         FORMAT(U24_BE),
183         FORMAT(S32_LE),
184         FORMAT(S32_BE),
185         FORMAT(U32_LE),
186         FORMAT(U32_BE),
187         FORMAT(FLOAT_LE),
188         FORMAT(FLOAT_BE),
189         FORMAT(FLOAT64_LE),
190         FORMAT(FLOAT64_BE),
191         FORMAT(IEC958_SUBFRAME_LE),
192         FORMAT(IEC958_SUBFRAME_BE),
193         FORMAT(MU_LAW),
194         FORMAT(A_LAW),
195         FORMAT(IMA_ADPCM),
196         FORMAT(MPEG),
197         FORMAT(GSM),
198         FORMAT(SPECIAL),
199         FORMAT(S24_3LE),
200         FORMAT(S24_3BE),
201         FORMAT(U24_3LE),
202         FORMAT(U24_3BE),
203         FORMAT(S20_3LE),
204         FORMAT(S20_3BE),
205         FORMAT(U20_3LE),
206         FORMAT(U20_3BE),
207         FORMAT(S18_3LE),
208         FORMAT(S18_3BE),
209         FORMAT(U18_3LE),
210         FORMAT(U18_3BE),
211         FORMAT(G723_24),
212         FORMAT(G723_24_1B),
213         FORMAT(G723_40),
214         FORMAT(G723_40_1B),
215         FORMAT(DSD_U8),
216         FORMAT(DSD_U16_LE),
217         FORMAT(DSD_U32_LE),
218         FORMAT(DSD_U16_BE),
219         FORMAT(DSD_U32_BE),
220 };
221 
222 /**
223  * snd_pcm_format_name - Return a name string for the given PCM format
224  * @format: PCM format
225  */
226 const char *snd_pcm_format_name(snd_pcm_format_t format)
227 {
228         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
229                 return "Unknown";
230         return snd_pcm_format_names[(__force unsigned int)format];
231 }
232 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233 
234 #ifdef CONFIG_SND_VERBOSE_PROCFS
235 
236 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238 #define READY(v) [SNDRV_PCM_READY_##v] = #v
239 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243 #define START(v) [SNDRV_PCM_START_##v] = #v
244 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
245 
246 static char *snd_pcm_stream_names[] = {
247         STREAM(PLAYBACK),
248         STREAM(CAPTURE),
249 };
250 
251 static char *snd_pcm_state_names[] = {
252         STATE(OPEN),
253         STATE(SETUP),
254         STATE(PREPARED),
255         STATE(RUNNING),
256         STATE(XRUN),
257         STATE(DRAINING),
258         STATE(PAUSED),
259         STATE(SUSPENDED),
260 };
261 
262 static char *snd_pcm_access_names[] = {
263         ACCESS(MMAP_INTERLEAVED), 
264         ACCESS(MMAP_NONINTERLEAVED),
265         ACCESS(MMAP_COMPLEX),
266         ACCESS(RW_INTERLEAVED),
267         ACCESS(RW_NONINTERLEAVED),
268 };
269 
270 static char *snd_pcm_subformat_names[] = {
271         SUBFORMAT(STD), 
272 };
273 
274 static char *snd_pcm_tstamp_mode_names[] = {
275         TSTAMP(NONE),
276         TSTAMP(ENABLE),
277 };
278 
279 static const char *snd_pcm_stream_name(int stream)
280 {
281         return snd_pcm_stream_names[stream];
282 }
283 
284 static const char *snd_pcm_access_name(snd_pcm_access_t access)
285 {
286         return snd_pcm_access_names[(__force int)access];
287 }
288 
289 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
290 {
291         return snd_pcm_subformat_names[(__force int)subformat];
292 }
293 
294 static const char *snd_pcm_tstamp_mode_name(int mode)
295 {
296         return snd_pcm_tstamp_mode_names[mode];
297 }
298 
299 static const char *snd_pcm_state_name(snd_pcm_state_t state)
300 {
301         return snd_pcm_state_names[(__force int)state];
302 }
303 
304 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
305 #include <linux/soundcard.h>
306 
307 static const char *snd_pcm_oss_format_name(int format)
308 {
309         switch (format) {
310         case AFMT_MU_LAW:
311                 return "MU_LAW";
312         case AFMT_A_LAW:
313                 return "A_LAW";
314         case AFMT_IMA_ADPCM:
315                 return "IMA_ADPCM";
316         case AFMT_U8:
317                 return "U8";
318         case AFMT_S16_LE:
319                 return "S16_LE";
320         case AFMT_S16_BE:
321                 return "S16_BE";
322         case AFMT_S8:
323                 return "S8";
324         case AFMT_U16_LE:
325                 return "U16_LE";
326         case AFMT_U16_BE:
327                 return "U16_BE";
328         case AFMT_MPEG:
329                 return "MPEG";
330         default:
331                 return "unknown";
332         }
333 }
334 #endif
335 
336 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
337                                    struct snd_info_buffer *buffer)
338 {
339         struct snd_pcm_info *info;
340         int err;
341 
342         if (! substream)
343                 return;
344 
345         info = kmalloc(sizeof(*info), GFP_KERNEL);
346         if (!info)
347                 return;
348 
349         err = snd_pcm_info(substream, info);
350         if (err < 0) {
351                 snd_iprintf(buffer, "error %d\n", err);
352                 kfree(info);
353                 return;
354         }
355         snd_iprintf(buffer, "card: %d\n", info->card);
356         snd_iprintf(buffer, "device: %d\n", info->device);
357         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
358         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
359         snd_iprintf(buffer, "id: %s\n", info->id);
360         snd_iprintf(buffer, "name: %s\n", info->name);
361         snd_iprintf(buffer, "subname: %s\n", info->subname);
362         snd_iprintf(buffer, "class: %d\n", info->dev_class);
363         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
364         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
365         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
366         kfree(info);
367 }
368 
369 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
370                                           struct snd_info_buffer *buffer)
371 {
372         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
373                                buffer);
374 }
375 
376 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
377                                              struct snd_info_buffer *buffer)
378 {
379         snd_pcm_proc_info_read(entry->private_data, buffer);
380 }
381 
382 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
383                                                   struct snd_info_buffer *buffer)
384 {
385         struct snd_pcm_substream *substream = entry->private_data;
386         struct snd_pcm_runtime *runtime;
387 
388         mutex_lock(&substream->pcm->open_mutex);
389         runtime = substream->runtime;
390         if (!runtime) {
391                 snd_iprintf(buffer, "closed\n");
392                 goto unlock;
393         }
394         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
395                 snd_iprintf(buffer, "no setup\n");
396                 goto unlock;
397         }
398         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
399         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
400         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
401         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
402         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
403         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
404         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
405 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
406         if (substream->oss.oss) {
407                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
408                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
409                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
410                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
411                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
412                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
413         }
414 #endif
415  unlock:
416         mutex_unlock(&substream->pcm->open_mutex);
417 }
418 
419 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
420                                                   struct snd_info_buffer *buffer)
421 {
422         struct snd_pcm_substream *substream = entry->private_data;
423         struct snd_pcm_runtime *runtime;
424 
425         mutex_lock(&substream->pcm->open_mutex);
426         runtime = substream->runtime;
427         if (!runtime) {
428                 snd_iprintf(buffer, "closed\n");
429                 goto unlock;
430         }
431         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
432                 snd_iprintf(buffer, "no setup\n");
433                 goto unlock;
434         }
435         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
436         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
437         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
438         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
439         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
440         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
441         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
442         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
443  unlock:
444         mutex_unlock(&substream->pcm->open_mutex);
445 }
446 
447 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
448                                                struct snd_info_buffer *buffer)
449 {
450         struct snd_pcm_substream *substream = entry->private_data;
451         struct snd_pcm_runtime *runtime;
452         struct snd_pcm_status status;
453         int err;
454 
455         mutex_lock(&substream->pcm->open_mutex);
456         runtime = substream->runtime;
457         if (!runtime) {
458                 snd_iprintf(buffer, "closed\n");
459                 goto unlock;
460         }
461         memset(&status, 0, sizeof(status));
462         err = snd_pcm_status(substream, &status);
463         if (err < 0) {
464                 snd_iprintf(buffer, "error %d\n", err);
465                 goto unlock;
466         }
467         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
468         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
469         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
470                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
471         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
472                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
473         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
474         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
475         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
476         snd_iprintf(buffer, "-----\n");
477         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
478         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
479  unlock:
480         mutex_unlock(&substream->pcm->open_mutex);
481 }
482 
483 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
484 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
485                                          struct snd_info_buffer *buffer)
486 {
487         struct snd_pcm_substream *substream = entry->private_data;
488         struct snd_pcm_runtime *runtime;
489 
490         snd_pcm_stream_lock_irq(substream);
491         runtime = substream->runtime;
492         if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
493                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
494         snd_pcm_stream_unlock_irq(substream);
495 }
496 
497 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
498                                     struct snd_info_buffer *buffer)
499 {
500         struct snd_pcm_str *pstr = entry->private_data;
501         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
502 }
503 
504 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
505                                      struct snd_info_buffer *buffer)
506 {
507         struct snd_pcm_str *pstr = entry->private_data;
508         char line[64];
509         if (!snd_info_get_line(buffer, line, sizeof(line)))
510                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
511 }
512 #endif
513 
514 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
515 {
516         struct snd_pcm *pcm = pstr->pcm;
517         struct snd_info_entry *entry;
518         char name[16];
519 
520         sprintf(name, "pcm%i%c", pcm->device, 
521                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
522         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
523                 return -ENOMEM;
524         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525         if (snd_info_register(entry) < 0) {
526                 snd_info_free_entry(entry);
527                 return -ENOMEM;
528         }
529         pstr->proc_root = entry;
530 
531         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
532                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
533                 if (snd_info_register(entry) < 0) {
534                         snd_info_free_entry(entry);
535                         entry = NULL;
536                 }
537         }
538         pstr->proc_info_entry = entry;
539 
540 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
541         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
542                                                 pstr->proc_root)) != NULL) {
543                 entry->c.text.read = snd_pcm_xrun_debug_read;
544                 entry->c.text.write = snd_pcm_xrun_debug_write;
545                 entry->mode |= S_IWUSR;
546                 entry->private_data = pstr;
547                 if (snd_info_register(entry) < 0) {
548                         snd_info_free_entry(entry);
549                         entry = NULL;
550                 }
551         }
552         pstr->proc_xrun_debug_entry = entry;
553 #endif
554         return 0;
555 }
556 
557 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
558 {
559 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
560         snd_info_free_entry(pstr->proc_xrun_debug_entry);
561         pstr->proc_xrun_debug_entry = NULL;
562 #endif
563         snd_info_free_entry(pstr->proc_info_entry);
564         pstr->proc_info_entry = NULL;
565         snd_info_free_entry(pstr->proc_root);
566         pstr->proc_root = NULL;
567         return 0;
568 }
569 
570 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
571 {
572         struct snd_info_entry *entry;
573         struct snd_card *card;
574         char name[16];
575 
576         card = substream->pcm->card;
577 
578         sprintf(name, "sub%i", substream->number);
579         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
580                 return -ENOMEM;
581         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
582         if (snd_info_register(entry) < 0) {
583                 snd_info_free_entry(entry);
584                 return -ENOMEM;
585         }
586         substream->proc_root = entry;
587 
588         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
589                 snd_info_set_text_ops(entry, substream,
590                                       snd_pcm_substream_proc_info_read);
591                 if (snd_info_register(entry) < 0) {
592                         snd_info_free_entry(entry);
593                         entry = NULL;
594                 }
595         }
596         substream->proc_info_entry = entry;
597 
598         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
599                 snd_info_set_text_ops(entry, substream,
600                                       snd_pcm_substream_proc_hw_params_read);
601                 if (snd_info_register(entry) < 0) {
602                         snd_info_free_entry(entry);
603                         entry = NULL;
604                 }
605         }
606         substream->proc_hw_params_entry = entry;
607 
608         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
609                 snd_info_set_text_ops(entry, substream,
610                                       snd_pcm_substream_proc_sw_params_read);
611                 if (snd_info_register(entry) < 0) {
612                         snd_info_free_entry(entry);
613                         entry = NULL;
614                 }
615         }
616         substream->proc_sw_params_entry = entry;
617 
618         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
619                 snd_info_set_text_ops(entry, substream,
620                                       snd_pcm_substream_proc_status_read);
621                 if (snd_info_register(entry) < 0) {
622                         snd_info_free_entry(entry);
623                         entry = NULL;
624                 }
625         }
626         substream->proc_status_entry = entry;
627 
628 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
629         entry = snd_info_create_card_entry(card, "xrun_injection",
630                                            substream->proc_root);
631         if (entry) {
632                 entry->private_data = substream;
633                 entry->c.text.read = NULL;
634                 entry->c.text.write = snd_pcm_xrun_injection_write;
635                 entry->mode = S_IFREG | S_IWUSR;
636                 if (snd_info_register(entry) < 0) {
637                         snd_info_free_entry(entry);
638                         entry = NULL;
639                 }
640         }
641         substream->proc_xrun_injection_entry = entry;
642 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
643 
644         return 0;
645 }
646 
647 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
648 {
649         snd_info_free_entry(substream->proc_info_entry);
650         substream->proc_info_entry = NULL;
651         snd_info_free_entry(substream->proc_hw_params_entry);
652         substream->proc_hw_params_entry = NULL;
653         snd_info_free_entry(substream->proc_sw_params_entry);
654         substream->proc_sw_params_entry = NULL;
655         snd_info_free_entry(substream->proc_status_entry);
656         substream->proc_status_entry = NULL;
657 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
658         snd_info_free_entry(substream->proc_xrun_injection_entry);
659         substream->proc_xrun_injection_entry = NULL;
660 #endif
661         snd_info_free_entry(substream->proc_root);
662         substream->proc_root = NULL;
663         return 0;
664 }
665 #else /* !CONFIG_SND_VERBOSE_PROCFS */
666 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
667 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
668 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
669 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
670 #endif /* CONFIG_SND_VERBOSE_PROCFS */
671 
672 static const struct attribute_group *pcm_dev_attr_groups[];
673 
674 /**
675  * snd_pcm_new_stream - create a new PCM stream
676  * @pcm: the pcm instance
677  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
678  * @substream_count: the number of substreams
679  *
680  * Creates a new stream for the pcm.
681  * The corresponding stream on the pcm must have been empty before
682  * calling this, i.e. zero must be given to the argument of
683  * snd_pcm_new().
684  *
685  * Return: Zero if successful, or a negative error code on failure.
686  */
687 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
688 {
689         int idx, err;
690         struct snd_pcm_str *pstr = &pcm->streams[stream];
691         struct snd_pcm_substream *substream, *prev;
692 
693 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
694         mutex_init(&pstr->oss.setup_mutex);
695 #endif
696         pstr->stream = stream;
697         pstr->pcm = pcm;
698         pstr->substream_count = substream_count;
699         if (!substream_count)
700                 return 0;
701 
702         snd_device_initialize(&pstr->dev, pcm->card);
703         pstr->dev.groups = pcm_dev_attr_groups;
704         dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
705                      stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
706 
707         if (!pcm->internal) {
708                 err = snd_pcm_stream_proc_init(pstr);
709                 if (err < 0) {
710                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
711                         return err;
712                 }
713         }
714         prev = NULL;
715         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
716                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
717                 if (!substream)
718                         return -ENOMEM;
719                 substream->pcm = pcm;
720                 substream->pstr = pstr;
721                 substream->number = idx;
722                 substream->stream = stream;
723                 sprintf(substream->name, "subdevice #%i", idx);
724                 substream->buffer_bytes_max = UINT_MAX;
725                 if (prev == NULL)
726                         pstr->substream = substream;
727                 else
728                         prev->next = substream;
729 
730                 if (!pcm->internal) {
731                         err = snd_pcm_substream_proc_init(substream);
732                         if (err < 0) {
733                                 pcm_err(pcm,
734                                         "Error in snd_pcm_stream_proc_init\n");
735                                 if (prev == NULL)
736                                         pstr->substream = NULL;
737                                 else
738                                         prev->next = NULL;
739                                 kfree(substream);
740                                 return err;
741                         }
742                 }
743                 substream->group = &substream->self_group;
744                 spin_lock_init(&substream->self_group.lock);
745                 mutex_init(&substream->self_group.mutex);
746                 INIT_LIST_HEAD(&substream->self_group.substreams);
747                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
748                 atomic_set(&substream->mmap_count, 0);
749                 prev = substream;
750         }
751         return 0;
752 }                               
753 EXPORT_SYMBOL(snd_pcm_new_stream);
754 
755 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
756                 int playback_count, int capture_count, bool internal,
757                 struct snd_pcm **rpcm)
758 {
759         struct snd_pcm *pcm;
760         int err;
761         static struct snd_device_ops ops = {
762                 .dev_free = snd_pcm_dev_free,
763                 .dev_register = snd_pcm_dev_register,
764                 .dev_disconnect = snd_pcm_dev_disconnect,
765         };
766 
767         if (snd_BUG_ON(!card))
768                 return -ENXIO;
769         if (rpcm)
770                 *rpcm = NULL;
771         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
772         if (!pcm)
773                 return -ENOMEM;
774         pcm->card = card;
775         pcm->device = device;
776         pcm->internal = internal;
777         mutex_init(&pcm->open_mutex);
778         init_waitqueue_head(&pcm->open_wait);
779         INIT_LIST_HEAD(&pcm->list);
780         if (id)
781                 strlcpy(pcm->id, id, sizeof(pcm->id));
782         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
783                 snd_pcm_free(pcm);
784                 return err;
785         }
786         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
787                 snd_pcm_free(pcm);
788                 return err;
789         }
790         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
791                 snd_pcm_free(pcm);
792                 return err;
793         }
794         if (rpcm)
795                 *rpcm = pcm;
796         return 0;
797 }
798 
799 /**
800  * snd_pcm_new - create a new PCM instance
801  * @card: the card instance
802  * @id: the id string
803  * @device: the device index (zero based)
804  * @playback_count: the number of substreams for playback
805  * @capture_count: the number of substreams for capture
806  * @rpcm: the pointer to store the new pcm instance
807  *
808  * Creates a new PCM instance.
809  *
810  * The pcm operators have to be set afterwards to the new instance
811  * via snd_pcm_set_ops().
812  *
813  * Return: Zero if successful, or a negative error code on failure.
814  */
815 int snd_pcm_new(struct snd_card *card, const char *id, int device,
816                 int playback_count, int capture_count, struct snd_pcm **rpcm)
817 {
818         return _snd_pcm_new(card, id, device, playback_count, capture_count,
819                         false, rpcm);
820 }
821 EXPORT_SYMBOL(snd_pcm_new);
822 
823 /**
824  * snd_pcm_new_internal - create a new internal PCM instance
825  * @card: the card instance
826  * @id: the id string
827  * @device: the device index (zero based - shared with normal PCMs)
828  * @playback_count: the number of substreams for playback
829  * @capture_count: the number of substreams for capture
830  * @rpcm: the pointer to store the new pcm instance
831  *
832  * Creates a new internal PCM instance with no userspace device or procfs
833  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
834  * will only be used internally by kernel drivers. i.e. it cannot be opened
835  * by userspace. It provides existing ASoC components drivers with a substream
836  * and access to any private data.
837  *
838  * The pcm operators have to be set afterwards to the new instance
839  * via snd_pcm_set_ops().
840  *
841  * Return: Zero if successful, or a negative error code on failure.
842  */
843 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
844         int playback_count, int capture_count,
845         struct snd_pcm **rpcm)
846 {
847         return _snd_pcm_new(card, id, device, playback_count, capture_count,
848                         true, rpcm);
849 }
850 EXPORT_SYMBOL(snd_pcm_new_internal);
851 
852 static void free_chmap(struct snd_pcm_str *pstr)
853 {
854         if (pstr->chmap_kctl) {
855                 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
856                 pstr->chmap_kctl = NULL;
857         }
858 }
859 
860 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
861 {
862         struct snd_pcm_substream *substream, *substream_next;
863 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
864         struct snd_pcm_oss_setup *setup, *setupn;
865 #endif
866         substream = pstr->substream;
867         while (substream) {
868                 substream_next = substream->next;
869                 snd_pcm_timer_done(substream);
870                 snd_pcm_substream_proc_done(substream);
871                 kfree(substream);
872                 substream = substream_next;
873         }
874         snd_pcm_stream_proc_done(pstr);
875 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
876         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
877                 setupn = setup->next;
878                 kfree(setup->task_name);
879                 kfree(setup);
880         }
881 #endif
882         free_chmap(pstr);
883         if (pstr->substream_count)
884                 put_device(&pstr->dev);
885 }
886 
887 static int snd_pcm_free(struct snd_pcm *pcm)
888 {
889         struct snd_pcm_notify *notify;
890 
891         if (!pcm)
892                 return 0;
893         if (!pcm->internal) {
894                 list_for_each_entry(notify, &snd_pcm_notify_list, list)
895                         notify->n_unregister(pcm);
896         }
897         if (pcm->private_free)
898                 pcm->private_free(pcm);
899         snd_pcm_lib_preallocate_free_for_all(pcm);
900         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
901         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
902         kfree(pcm);
903         return 0;
904 }
905 
906 static int snd_pcm_dev_free(struct snd_device *device)
907 {
908         struct snd_pcm *pcm = device->device_data;
909         return snd_pcm_free(pcm);
910 }
911 
912 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
913                              struct file *file,
914                              struct snd_pcm_substream **rsubstream)
915 {
916         struct snd_pcm_str * pstr;
917         struct snd_pcm_substream *substream;
918         struct snd_pcm_runtime *runtime;
919         struct snd_card *card;
920         int prefer_subdevice;
921         size_t size;
922 
923         if (snd_BUG_ON(!pcm || !rsubstream))
924                 return -ENXIO;
925         if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
926                        stream != SNDRV_PCM_STREAM_CAPTURE))
927                 return -EINVAL;
928         *rsubstream = NULL;
929         pstr = &pcm->streams[stream];
930         if (pstr->substream == NULL || pstr->substream_count == 0)
931                 return -ENODEV;
932 
933         card = pcm->card;
934         prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
935 
936         if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
937                 int opposite = !stream;
938 
939                 for (substream = pcm->streams[opposite].substream; substream;
940                      substream = substream->next) {
941                         if (SUBSTREAM_BUSY(substream))
942                                 return -EAGAIN;
943                 }
944         }
945 
946         if (file->f_flags & O_APPEND) {
947                 if (prefer_subdevice < 0) {
948                         if (pstr->substream_count > 1)
949                                 return -EINVAL; /* must be unique */
950                         substream = pstr->substream;
951                 } else {
952                         for (substream = pstr->substream; substream;
953                              substream = substream->next)
954                                 if (substream->number == prefer_subdevice)
955                                         break;
956                 }
957                 if (! substream)
958                         return -ENODEV;
959                 if (! SUBSTREAM_BUSY(substream))
960                         return -EBADFD;
961                 substream->ref_count++;
962                 *rsubstream = substream;
963                 return 0;
964         }
965 
966         for (substream = pstr->substream; substream; substream = substream->next) {
967                 if (!SUBSTREAM_BUSY(substream) &&
968                     (prefer_subdevice == -1 ||
969                      substream->number == prefer_subdevice))
970                         break;
971         }
972         if (substream == NULL)
973                 return -EAGAIN;
974 
975         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
976         if (runtime == NULL)
977                 return -ENOMEM;
978 
979         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
980         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
981         if (runtime->status == NULL) {
982                 kfree(runtime);
983                 return -ENOMEM;
984         }
985         memset((void*)runtime->status, 0, size);
986 
987         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
988         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
989         if (runtime->control == NULL) {
990                 snd_free_pages((void*)runtime->status,
991                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
992                 kfree(runtime);
993                 return -ENOMEM;
994         }
995         memset((void*)runtime->control, 0, size);
996 
997         init_waitqueue_head(&runtime->sleep);
998         init_waitqueue_head(&runtime->tsleep);
999 
1000         runtime->status->state = SNDRV_PCM_STATE_OPEN;
1001 
1002         substream->runtime = runtime;
1003         substream->private_data = pcm->private_data;
1004         substream->ref_count = 1;
1005         substream->f_flags = file->f_flags;
1006         substream->pid = get_pid(task_pid(current));
1007         pstr->substream_opened++;
1008         *rsubstream = substream;
1009         return 0;
1010 }
1011 
1012 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1013 {
1014         struct snd_pcm_runtime *runtime;
1015 
1016         if (PCM_RUNTIME_CHECK(substream))
1017                 return;
1018         runtime = substream->runtime;
1019         if (runtime->private_free != NULL)
1020                 runtime->private_free(runtime);
1021         snd_free_pages((void*)runtime->status,
1022                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1023         snd_free_pages((void*)runtime->control,
1024                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1025         kfree(runtime->hw_constraints.rules);
1026         kfree(runtime);
1027         substream->runtime = NULL;
1028         put_pid(substream->pid);
1029         substream->pid = NULL;
1030         substream->pstr->substream_opened--;
1031 }
1032 
1033 static ssize_t show_pcm_class(struct device *dev,
1034                               struct device_attribute *attr, char *buf)
1035 {
1036         struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1037         struct snd_pcm *pcm = pstr->pcm;
1038         const char *str;
1039         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1040                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1041                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1042                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1043                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1044         };
1045 
1046         if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1047                 str = "none";
1048         else
1049                 str = strs[pcm->dev_class];
1050         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1051 }
1052 
1053 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1054 static struct attribute *pcm_dev_attrs[] = {
1055         &dev_attr_pcm_class.attr,
1056         NULL
1057 };
1058 
1059 static struct attribute_group pcm_dev_attr_group = {
1060         .attrs  = pcm_dev_attrs,
1061 };
1062 
1063 static const struct attribute_group *pcm_dev_attr_groups[] = {
1064         &pcm_dev_attr_group,
1065         NULL
1066 };
1067 
1068 static int snd_pcm_dev_register(struct snd_device *device)
1069 {
1070         int cidx, err;
1071         struct snd_pcm_substream *substream;
1072         struct snd_pcm_notify *notify;
1073         struct snd_pcm *pcm;
1074 
1075         if (snd_BUG_ON(!device || !device->device_data))
1076                 return -ENXIO;
1077         pcm = device->device_data;
1078         if (pcm->internal)
1079                 return 0;
1080 
1081         mutex_lock(&register_mutex);
1082         err = snd_pcm_add(pcm);
1083         if (err)
1084                 goto unlock;
1085         for (cidx = 0; cidx < 2; cidx++) {
1086                 int devtype = -1;
1087                 if (pcm->streams[cidx].substream == NULL)
1088                         continue;
1089                 switch (cidx) {
1090                 case SNDRV_PCM_STREAM_PLAYBACK:
1091                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1092                         break;
1093                 case SNDRV_PCM_STREAM_CAPTURE:
1094                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1095                         break;
1096                 }
1097                 /* register pcm */
1098                 err = snd_register_device(devtype, pcm->card, pcm->device,
1099                                           &snd_pcm_f_ops[cidx], pcm,
1100                                           &pcm->streams[cidx].dev);
1101                 if (err < 0) {
1102                         list_del_init(&pcm->list);
1103                         goto unlock;
1104                 }
1105 
1106                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1107                         snd_pcm_timer_init(substream);
1108         }
1109 
1110         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1111                 notify->n_register(pcm);
1112 
1113  unlock:
1114         mutex_unlock(&register_mutex);
1115         return err;
1116 }
1117 
1118 static int snd_pcm_dev_disconnect(struct snd_device *device)
1119 {
1120         struct snd_pcm *pcm = device->device_data;
1121         struct snd_pcm_notify *notify;
1122         struct snd_pcm_substream *substream;
1123         int cidx;
1124 
1125         mutex_lock(&register_mutex);
1126         mutex_lock(&pcm->open_mutex);
1127         wake_up(&pcm->open_wait);
1128         list_del_init(&pcm->list);
1129         for (cidx = 0; cidx < 2; cidx++) {
1130                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1131                         snd_pcm_stream_lock_irq(substream);
1132                         if (substream->runtime) {
1133                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1134                                 wake_up(&substream->runtime->sleep);
1135                                 wake_up(&substream->runtime->tsleep);
1136                         }
1137                         snd_pcm_stream_unlock_irq(substream);
1138                 }
1139         }
1140         if (!pcm->internal) {
1141                 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1142                         notify->n_disconnect(pcm);
1143         }
1144         for (cidx = 0; cidx < 2; cidx++) {
1145                 if (!pcm->internal)
1146                         snd_unregister_device(&pcm->streams[cidx].dev);
1147                 free_chmap(&pcm->streams[cidx]);
1148         }
1149         mutex_unlock(&pcm->open_mutex);
1150         mutex_unlock(&register_mutex);
1151         return 0;
1152 }
1153 
1154 /**
1155  * snd_pcm_notify - Add/remove the notify list
1156  * @notify: PCM notify list
1157  * @nfree: 0 = register, 1 = unregister
1158  *
1159  * This adds the given notifier to the global list so that the callback is
1160  * called for each registered PCM devices.  This exists only for PCM OSS
1161  * emulation, so far.
1162  */
1163 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1164 {
1165         struct snd_pcm *pcm;
1166 
1167         if (snd_BUG_ON(!notify ||
1168                        !notify->n_register ||
1169                        !notify->n_unregister ||
1170                        !notify->n_disconnect))
1171                 return -EINVAL;
1172         mutex_lock(&register_mutex);
1173         if (nfree) {
1174                 list_del(&notify->list);
1175                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1176                         notify->n_unregister(pcm);
1177         } else {
1178                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1179                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1180                         notify->n_register(pcm);
1181         }
1182         mutex_unlock(&register_mutex);
1183         return 0;
1184 }
1185 EXPORT_SYMBOL(snd_pcm_notify);
1186 
1187 #ifdef CONFIG_SND_PROC_FS
1188 /*
1189  *  Info interface
1190  */
1191 
1192 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1193                               struct snd_info_buffer *buffer)
1194 {
1195         struct snd_pcm *pcm;
1196 
1197         mutex_lock(&register_mutex);
1198         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1199                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1200                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1201                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1202                         snd_iprintf(buffer, " : playback %i",
1203                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1204                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1205                         snd_iprintf(buffer, " : capture %i",
1206                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1207                 snd_iprintf(buffer, "\n");
1208         }
1209         mutex_unlock(&register_mutex);
1210 }
1211 
1212 static struct snd_info_entry *snd_pcm_proc_entry;
1213 
1214 static void snd_pcm_proc_init(void)
1215 {
1216         struct snd_info_entry *entry;
1217 
1218         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1219                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1220                 if (snd_info_register(entry) < 0) {
1221                         snd_info_free_entry(entry);
1222                         entry = NULL;
1223                 }
1224         }
1225         snd_pcm_proc_entry = entry;
1226 }
1227 
1228 static void snd_pcm_proc_done(void)
1229 {
1230         snd_info_free_entry(snd_pcm_proc_entry);
1231 }
1232 
1233 #else /* !CONFIG_SND_PROC_FS */
1234 #define snd_pcm_proc_init()
1235 #define snd_pcm_proc_done()
1236 #endif /* CONFIG_SND_PROC_FS */
1237 
1238 
1239 /*
1240  *  ENTRY functions
1241  */
1242 
1243 static int __init alsa_pcm_init(void)
1244 {
1245         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1246         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1247         snd_pcm_proc_init();
1248         return 0;
1249 }
1250 
1251 static void __exit alsa_pcm_exit(void)
1252 {
1253         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1254         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1255         snd_pcm_proc_done();
1256 }
1257 
1258 module_init(alsa_pcm_init)
1259 module_exit(alsa_pcm_exit)
1260 

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