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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ 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                         err = snd_pcm_info_user(substream, info);
154                 _error:
155                         mutex_unlock(&register_mutex);
156                         return err;
157                 }
158         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
159                 {
160                         int val;
161                         
162                         if (get_user(val, (int __user *)arg))
163                                 return -EFAULT;
164                         control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
165                         return 0;
166                 }
167         }
168         return -ENOIOCTLCMD;
169 }
170 
171 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
172 
173 static char *snd_pcm_format_names[] = {
174         FORMAT(S8),
175         FORMAT(U8),
176         FORMAT(S16_LE),
177         FORMAT(S16_BE),
178         FORMAT(U16_LE),
179         FORMAT(U16_BE),
180         FORMAT(S24_LE),
181         FORMAT(S24_BE),
182         FORMAT(U24_LE),
183         FORMAT(U24_BE),
184         FORMAT(S32_LE),
185         FORMAT(S32_BE),
186         FORMAT(U32_LE),
187         FORMAT(U32_BE),
188         FORMAT(FLOAT_LE),
189         FORMAT(FLOAT_BE),
190         FORMAT(FLOAT64_LE),
191         FORMAT(FLOAT64_BE),
192         FORMAT(IEC958_SUBFRAME_LE),
193         FORMAT(IEC958_SUBFRAME_BE),
194         FORMAT(MU_LAW),
195         FORMAT(A_LAW),
196         FORMAT(IMA_ADPCM),
197         FORMAT(MPEG),
198         FORMAT(GSM),
199         FORMAT(SPECIAL),
200         FORMAT(S24_3LE),
201         FORMAT(S24_3BE),
202         FORMAT(U24_3LE),
203         FORMAT(U24_3BE),
204         FORMAT(S20_3LE),
205         FORMAT(S20_3BE),
206         FORMAT(U20_3LE),
207         FORMAT(U20_3BE),
208         FORMAT(S18_3LE),
209         FORMAT(S18_3BE),
210         FORMAT(U18_3LE),
211         FORMAT(U18_3BE),
212         FORMAT(G723_24),
213         FORMAT(G723_24_1B),
214         FORMAT(G723_40),
215         FORMAT(G723_40_1B),
216         FORMAT(DSD_U8),
217         FORMAT(DSD_U16_LE),
218         FORMAT(DSD_U32_LE),
219         FORMAT(DSD_U16_BE),
220         FORMAT(DSD_U32_BE),
221 };
222 
223 /**
224  * snd_pcm_format_name - Return a name string for the given PCM format
225  * @format: PCM format
226  */
227 const char *snd_pcm_format_name(snd_pcm_format_t format)
228 {
229         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
230                 return "Unknown";
231         return snd_pcm_format_names[(__force unsigned int)format];
232 }
233 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
234 
235 #ifdef CONFIG_SND_VERBOSE_PROCFS
236 
237 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
238 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
239 #define READY(v) [SNDRV_PCM_READY_##v] = #v
240 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
241 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
242 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
243 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
244 #define START(v) [SNDRV_PCM_START_##v] = #v
245 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
246 
247 static char *snd_pcm_stream_names[] = {
248         STREAM(PLAYBACK),
249         STREAM(CAPTURE),
250 };
251 
252 static char *snd_pcm_state_names[] = {
253         STATE(OPEN),
254         STATE(SETUP),
255         STATE(PREPARED),
256         STATE(RUNNING),
257         STATE(XRUN),
258         STATE(DRAINING),
259         STATE(PAUSED),
260         STATE(SUSPENDED),
261 };
262 
263 static char *snd_pcm_access_names[] = {
264         ACCESS(MMAP_INTERLEAVED), 
265         ACCESS(MMAP_NONINTERLEAVED),
266         ACCESS(MMAP_COMPLEX),
267         ACCESS(RW_INTERLEAVED),
268         ACCESS(RW_NONINTERLEAVED),
269 };
270 
271 static char *snd_pcm_subformat_names[] = {
272         SUBFORMAT(STD), 
273 };
274 
275 static char *snd_pcm_tstamp_mode_names[] = {
276         TSTAMP(NONE),
277         TSTAMP(ENABLE),
278 };
279 
280 static const char *snd_pcm_stream_name(int stream)
281 {
282         return snd_pcm_stream_names[stream];
283 }
284 
285 static const char *snd_pcm_access_name(snd_pcm_access_t access)
286 {
287         return snd_pcm_access_names[(__force int)access];
288 }
289 
290 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
291 {
292         return snd_pcm_subformat_names[(__force int)subformat];
293 }
294 
295 static const char *snd_pcm_tstamp_mode_name(int mode)
296 {
297         return snd_pcm_tstamp_mode_names[mode];
298 }
299 
300 static const char *snd_pcm_state_name(snd_pcm_state_t state)
301 {
302         return snd_pcm_state_names[(__force int)state];
303 }
304 
305 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
306 #include <linux/soundcard.h>
307 
308 static const char *snd_pcm_oss_format_name(int format)
309 {
310         switch (format) {
311         case AFMT_MU_LAW:
312                 return "MU_LAW";
313         case AFMT_A_LAW:
314                 return "A_LAW";
315         case AFMT_IMA_ADPCM:
316                 return "IMA_ADPCM";
317         case AFMT_U8:
318                 return "U8";
319         case AFMT_S16_LE:
320                 return "S16_LE";
321         case AFMT_S16_BE:
322                 return "S16_BE";
323         case AFMT_S8:
324                 return "S8";
325         case AFMT_U16_LE:
326                 return "U16_LE";
327         case AFMT_U16_BE:
328                 return "U16_BE";
329         case AFMT_MPEG:
330                 return "MPEG";
331         default:
332                 return "unknown";
333         }
334 }
335 #endif
336 
337 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
338                                    struct snd_info_buffer *buffer)
339 {
340         struct snd_pcm_info *info;
341         int err;
342 
343         if (! substream)
344                 return;
345 
346         info = kmalloc(sizeof(*info), GFP_KERNEL);
347         if (! info) {
348                 pcm_dbg(substream->pcm,
349                         "snd_pcm_proc_info_read: cannot malloc\n");
350                 return;
351         }
352 
353         err = snd_pcm_info(substream, info);
354         if (err < 0) {
355                 snd_iprintf(buffer, "error %d\n", err);
356                 kfree(info);
357                 return;
358         }
359         snd_iprintf(buffer, "card: %d\n", info->card);
360         snd_iprintf(buffer, "device: %d\n", info->device);
361         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
362         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
363         snd_iprintf(buffer, "id: %s\n", info->id);
364         snd_iprintf(buffer, "name: %s\n", info->name);
365         snd_iprintf(buffer, "subname: %s\n", info->subname);
366         snd_iprintf(buffer, "class: %d\n", info->dev_class);
367         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
368         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
369         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
370         kfree(info);
371 }
372 
373 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
374                                           struct snd_info_buffer *buffer)
375 {
376         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
377                                buffer);
378 }
379 
380 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
381                                              struct snd_info_buffer *buffer)
382 {
383         snd_pcm_proc_info_read(entry->private_data, buffer);
384 }
385 
386 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
387                                                   struct snd_info_buffer *buffer)
388 {
389         struct snd_pcm_substream *substream = entry->private_data;
390         struct snd_pcm_runtime *runtime;
391 
392         mutex_lock(&substream->pcm->open_mutex);
393         runtime = substream->runtime;
394         if (!runtime) {
395                 snd_iprintf(buffer, "closed\n");
396                 goto unlock;
397         }
398         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
399                 snd_iprintf(buffer, "no setup\n");
400                 goto unlock;
401         }
402         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
403         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
404         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
405         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
406         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
407         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
408         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
409 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
410         if (substream->oss.oss) {
411                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
412                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
413                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
414                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
415                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
416                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
417         }
418 #endif
419  unlock:
420         mutex_unlock(&substream->pcm->open_mutex);
421 }
422 
423 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
424                                                   struct snd_info_buffer *buffer)
425 {
426         struct snd_pcm_substream *substream = entry->private_data;
427         struct snd_pcm_runtime *runtime;
428 
429         mutex_lock(&substream->pcm->open_mutex);
430         runtime = substream->runtime;
431         if (!runtime) {
432                 snd_iprintf(buffer, "closed\n");
433                 goto unlock;
434         }
435         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
436                 snd_iprintf(buffer, "no setup\n");
437                 goto unlock;
438         }
439         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
440         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
441         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
442         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
443         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
444         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
445         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
446         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
447  unlock:
448         mutex_unlock(&substream->pcm->open_mutex);
449 }
450 
451 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
452                                                struct snd_info_buffer *buffer)
453 {
454         struct snd_pcm_substream *substream = entry->private_data;
455         struct snd_pcm_runtime *runtime;
456         struct snd_pcm_status status;
457         int err;
458 
459         mutex_lock(&substream->pcm->open_mutex);
460         runtime = substream->runtime;
461         if (!runtime) {
462                 snd_iprintf(buffer, "closed\n");
463                 goto unlock;
464         }
465         memset(&status, 0, sizeof(status));
466         err = snd_pcm_status(substream, &status);
467         if (err < 0) {
468                 snd_iprintf(buffer, "error %d\n", err);
469                 goto unlock;
470         }
471         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
472         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
473         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
474                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
475         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
476                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
477         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
478         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
479         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
480         snd_iprintf(buffer, "-----\n");
481         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
482         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
483  unlock:
484         mutex_unlock(&substream->pcm->open_mutex);
485 }
486 
487 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
488 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
489                                          struct snd_info_buffer *buffer)
490 {
491         struct snd_pcm_substream *substream = entry->private_data;
492         struct snd_pcm_runtime *runtime;
493 
494         snd_pcm_stream_lock_irq(substream);
495         runtime = substream->runtime;
496         if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
497                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
498         snd_pcm_stream_unlock_irq(substream);
499 }
500 
501 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
502                                     struct snd_info_buffer *buffer)
503 {
504         struct snd_pcm_str *pstr = entry->private_data;
505         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
506 }
507 
508 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
509                                      struct snd_info_buffer *buffer)
510 {
511         struct snd_pcm_str *pstr = entry->private_data;
512         char line[64];
513         if (!snd_info_get_line(buffer, line, sizeof(line)))
514                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
515 }
516 #endif
517 
518 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
519 {
520         struct snd_pcm *pcm = pstr->pcm;
521         struct snd_info_entry *entry;
522         char name[16];
523 
524         sprintf(name, "pcm%i%c", pcm->device, 
525                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
526         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
527                 return -ENOMEM;
528         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
529         if (snd_info_register(entry) < 0) {
530                 snd_info_free_entry(entry);
531                 return -ENOMEM;
532         }
533         pstr->proc_root = entry;
534 
535         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
536                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
537                 if (snd_info_register(entry) < 0) {
538                         snd_info_free_entry(entry);
539                         entry = NULL;
540                 }
541         }
542         pstr->proc_info_entry = entry;
543 
544 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
545         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
546                                                 pstr->proc_root)) != NULL) {
547                 entry->c.text.read = snd_pcm_xrun_debug_read;
548                 entry->c.text.write = snd_pcm_xrun_debug_write;
549                 entry->mode |= S_IWUSR;
550                 entry->private_data = pstr;
551                 if (snd_info_register(entry) < 0) {
552                         snd_info_free_entry(entry);
553                         entry = NULL;
554                 }
555         }
556         pstr->proc_xrun_debug_entry = entry;
557 #endif
558         return 0;
559 }
560 
561 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
562 {
563 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
564         snd_info_free_entry(pstr->proc_xrun_debug_entry);
565         pstr->proc_xrun_debug_entry = NULL;
566 #endif
567         snd_info_free_entry(pstr->proc_info_entry);
568         pstr->proc_info_entry = NULL;
569         snd_info_free_entry(pstr->proc_root);
570         pstr->proc_root = NULL;
571         return 0;
572 }
573 
574 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
575 {
576         struct snd_info_entry *entry;
577         struct snd_card *card;
578         char name[16];
579 
580         card = substream->pcm->card;
581 
582         sprintf(name, "sub%i", substream->number);
583         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
584                 return -ENOMEM;
585         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
586         if (snd_info_register(entry) < 0) {
587                 snd_info_free_entry(entry);
588                 return -ENOMEM;
589         }
590         substream->proc_root = entry;
591 
592         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
593                 snd_info_set_text_ops(entry, substream,
594                                       snd_pcm_substream_proc_info_read);
595                 if (snd_info_register(entry) < 0) {
596                         snd_info_free_entry(entry);
597                         entry = NULL;
598                 }
599         }
600         substream->proc_info_entry = entry;
601 
602         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
603                 snd_info_set_text_ops(entry, substream,
604                                       snd_pcm_substream_proc_hw_params_read);
605                 if (snd_info_register(entry) < 0) {
606                         snd_info_free_entry(entry);
607                         entry = NULL;
608                 }
609         }
610         substream->proc_hw_params_entry = entry;
611 
612         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
613                 snd_info_set_text_ops(entry, substream,
614                                       snd_pcm_substream_proc_sw_params_read);
615                 if (snd_info_register(entry) < 0) {
616                         snd_info_free_entry(entry);
617                         entry = NULL;
618                 }
619         }
620         substream->proc_sw_params_entry = entry;
621 
622         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
623                 snd_info_set_text_ops(entry, substream,
624                                       snd_pcm_substream_proc_status_read);
625                 if (snd_info_register(entry) < 0) {
626                         snd_info_free_entry(entry);
627                         entry = NULL;
628                 }
629         }
630         substream->proc_status_entry = entry;
631 
632 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
633         entry = snd_info_create_card_entry(card, "xrun_injection",
634                                            substream->proc_root);
635         if (entry) {
636                 entry->private_data = substream;
637                 entry->c.text.read = NULL;
638                 entry->c.text.write = snd_pcm_xrun_injection_write;
639                 entry->mode = S_IFREG | S_IWUSR;
640                 if (snd_info_register(entry) < 0) {
641                         snd_info_free_entry(entry);
642                         entry = NULL;
643                 }
644         }
645         substream->proc_xrun_injection_entry = entry;
646 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
647 
648         return 0;
649 }
650 
651 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
652 {
653         snd_info_free_entry(substream->proc_info_entry);
654         substream->proc_info_entry = NULL;
655         snd_info_free_entry(substream->proc_hw_params_entry);
656         substream->proc_hw_params_entry = NULL;
657         snd_info_free_entry(substream->proc_sw_params_entry);
658         substream->proc_sw_params_entry = NULL;
659         snd_info_free_entry(substream->proc_status_entry);
660         substream->proc_status_entry = NULL;
661 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
662         snd_info_free_entry(substream->proc_xrun_injection_entry);
663         substream->proc_xrun_injection_entry = NULL;
664 #endif
665         snd_info_free_entry(substream->proc_root);
666         substream->proc_root = NULL;
667         return 0;
668 }
669 #else /* !CONFIG_SND_VERBOSE_PROCFS */
670 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
671 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
672 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
673 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
674 #endif /* CONFIG_SND_VERBOSE_PROCFS */
675 
676 static const struct attribute_group *pcm_dev_attr_groups[];
677 
678 /**
679  * snd_pcm_new_stream - create a new PCM stream
680  * @pcm: the pcm instance
681  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
682  * @substream_count: the number of substreams
683  *
684  * Creates a new stream for the pcm.
685  * The corresponding stream on the pcm must have been empty before
686  * calling this, i.e. zero must be given to the argument of
687  * snd_pcm_new().
688  *
689  * Return: Zero if successful, or a negative error code on failure.
690  */
691 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
692 {
693         int idx, err;
694         struct snd_pcm_str *pstr = &pcm->streams[stream];
695         struct snd_pcm_substream *substream, *prev;
696 
697 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
698         mutex_init(&pstr->oss.setup_mutex);
699 #endif
700         pstr->stream = stream;
701         pstr->pcm = pcm;
702         pstr->substream_count = substream_count;
703         if (!substream_count)
704                 return 0;
705 
706         snd_device_initialize(&pstr->dev, pcm->card);
707         pstr->dev.groups = pcm_dev_attr_groups;
708         dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
709                      stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
710 
711         if (!pcm->internal) {
712                 err = snd_pcm_stream_proc_init(pstr);
713                 if (err < 0) {
714                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
715                         return err;
716                 }
717         }
718         prev = NULL;
719         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
720                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
721                 if (substream == NULL) {
722                         pcm_err(pcm, "Cannot allocate PCM substream\n");
723                         return -ENOMEM;
724                 }
725                 substream->pcm = pcm;
726                 substream->pstr = pstr;
727                 substream->number = idx;
728                 substream->stream = stream;
729                 sprintf(substream->name, "subdevice #%i", idx);
730                 substream->buffer_bytes_max = UINT_MAX;
731                 if (prev == NULL)
732                         pstr->substream = substream;
733                 else
734                         prev->next = substream;
735 
736                 if (!pcm->internal) {
737                         err = snd_pcm_substream_proc_init(substream);
738                         if (err < 0) {
739                                 pcm_err(pcm,
740                                         "Error in snd_pcm_stream_proc_init\n");
741                                 if (prev == NULL)
742                                         pstr->substream = NULL;
743                                 else
744                                         prev->next = NULL;
745                                 kfree(substream);
746                                 return err;
747                         }
748                 }
749                 substream->group = &substream->self_group;
750                 spin_lock_init(&substream->self_group.lock);
751                 mutex_init(&substream->self_group.mutex);
752                 INIT_LIST_HEAD(&substream->self_group.substreams);
753                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
754                 atomic_set(&substream->mmap_count, 0);
755                 prev = substream;
756         }
757         return 0;
758 }                               
759 EXPORT_SYMBOL(snd_pcm_new_stream);
760 
761 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
762                 int playback_count, int capture_count, bool internal,
763                 struct snd_pcm **rpcm)
764 {
765         struct snd_pcm *pcm;
766         int err;
767         static struct snd_device_ops ops = {
768                 .dev_free = snd_pcm_dev_free,
769                 .dev_register = snd_pcm_dev_register,
770                 .dev_disconnect = snd_pcm_dev_disconnect,
771         };
772 
773         if (snd_BUG_ON(!card))
774                 return -ENXIO;
775         if (rpcm)
776                 *rpcm = NULL;
777         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
778         if (pcm == NULL) {
779                 dev_err(card->dev, "Cannot allocate PCM\n");
780                 return -ENOMEM;
781         }
782         pcm->card = card;
783         pcm->device = device;
784         pcm->internal = internal;
785         if (id)
786                 strlcpy(pcm->id, id, sizeof(pcm->id));
787         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
788                 snd_pcm_free(pcm);
789                 return err;
790         }
791         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
792                 snd_pcm_free(pcm);
793                 return err;
794         }
795         mutex_init(&pcm->open_mutex);
796         init_waitqueue_head(&pcm->open_wait);
797         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
798                 snd_pcm_free(pcm);
799                 return err;
800         }
801         if (rpcm)
802                 *rpcm = pcm;
803         return 0;
804 }
805 
806 /**
807  * snd_pcm_new - create a new PCM instance
808  * @card: the card instance
809  * @id: the id string
810  * @device: the device index (zero based)
811  * @playback_count: the number of substreams for playback
812  * @capture_count: the number of substreams for capture
813  * @rpcm: the pointer to store the new pcm instance
814  *
815  * Creates a new PCM instance.
816  *
817  * The pcm operators have to be set afterwards to the new instance
818  * via snd_pcm_set_ops().
819  *
820  * Return: Zero if successful, or a negative error code on failure.
821  */
822 int snd_pcm_new(struct snd_card *card, const char *id, int device,
823                 int playback_count, int capture_count, struct snd_pcm **rpcm)
824 {
825         return _snd_pcm_new(card, id, device, playback_count, capture_count,
826                         false, rpcm);
827 }
828 EXPORT_SYMBOL(snd_pcm_new);
829 
830 /**
831  * snd_pcm_new_internal - create a new internal PCM instance
832  * @card: the card instance
833  * @id: the id string
834  * @device: the device index (zero based - shared with normal PCMs)
835  * @playback_count: the number of substreams for playback
836  * @capture_count: the number of substreams for capture
837  * @rpcm: the pointer to store the new pcm instance
838  *
839  * Creates a new internal PCM instance with no userspace device or procfs
840  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
841  * will only be used internally by kernel drivers. i.e. it cannot be opened
842  * by userspace. It provides existing ASoC components drivers with a substream
843  * and access to any private data.
844  *
845  * The pcm operators have to be set afterwards to the new instance
846  * via snd_pcm_set_ops().
847  *
848  * Return: Zero if successful, or a negative error code on failure.
849  */
850 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
851         int playback_count, int capture_count,
852         struct snd_pcm **rpcm)
853 {
854         return _snd_pcm_new(card, id, device, playback_count, capture_count,
855                         true, rpcm);
856 }
857 EXPORT_SYMBOL(snd_pcm_new_internal);
858 
859 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
860 {
861         struct snd_pcm_substream *substream, *substream_next;
862 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
863         struct snd_pcm_oss_setup *setup, *setupn;
864 #endif
865         substream = pstr->substream;
866         while (substream) {
867                 substream_next = substream->next;
868                 snd_pcm_timer_done(substream);
869                 snd_pcm_substream_proc_done(substream);
870                 kfree(substream);
871                 substream = substream_next;
872         }
873         snd_pcm_stream_proc_done(pstr);
874 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
875         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
876                 setupn = setup->next;
877                 kfree(setup->task_name);
878                 kfree(setup);
879         }
880 #endif
881         if (pstr->substream_count)
882                 put_device(&pstr->dev);
883 }
884 
885 static int snd_pcm_free(struct snd_pcm *pcm)
886 {
887         struct snd_pcm_notify *notify;
888 
889         if (!pcm)
890                 return 0;
891         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
892                 notify->n_unregister(pcm);
893         }
894         if (pcm->private_free)
895                 pcm->private_free(pcm);
896         snd_pcm_lib_preallocate_free_for_all(pcm);
897         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
898         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
899         kfree(pcm);
900         return 0;
901 }
902 
903 static int snd_pcm_dev_free(struct snd_device *device)
904 {
905         struct snd_pcm *pcm = device->device_data;
906         return snd_pcm_free(pcm);
907 }
908 
909 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
910                              struct file *file,
911                              struct snd_pcm_substream **rsubstream)
912 {
913         struct snd_pcm_str * pstr;
914         struct snd_pcm_substream *substream;
915         struct snd_pcm_runtime *runtime;
916         struct snd_card *card;
917         int prefer_subdevice;
918         size_t size;
919 
920         if (snd_BUG_ON(!pcm || !rsubstream))
921                 return -ENXIO;
922         *rsubstream = NULL;
923         pstr = &pcm->streams[stream];
924         if (pstr->substream == NULL || pstr->substream_count == 0)
925                 return -ENODEV;
926 
927         card = pcm->card;
928         prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
929 
930         switch (stream) {
931         case SNDRV_PCM_STREAM_PLAYBACK:
932                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
933                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
934                                 if (SUBSTREAM_BUSY(substream))
935                                         return -EAGAIN;
936                         }
937                 }
938                 break;
939         case SNDRV_PCM_STREAM_CAPTURE:
940                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
941                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
942                                 if (SUBSTREAM_BUSY(substream))
943                                         return -EAGAIN;
944                         }
945                 }
946                 break;
947         default:
948                 return -EINVAL;
949         }
950 
951         if (file->f_flags & O_APPEND) {
952                 if (prefer_subdevice < 0) {
953                         if (pstr->substream_count > 1)
954                                 return -EINVAL; /* must be unique */
955                         substream = pstr->substream;
956                 } else {
957                         for (substream = pstr->substream; substream;
958                              substream = substream->next)
959                                 if (substream->number == prefer_subdevice)
960                                         break;
961                 }
962                 if (! substream)
963                         return -ENODEV;
964                 if (! SUBSTREAM_BUSY(substream))
965                         return -EBADFD;
966                 substream->ref_count++;
967                 *rsubstream = substream;
968                 return 0;
969         }
970 
971         if (prefer_subdevice >= 0) {
972                 for (substream = pstr->substream; substream; substream = substream->next)
973                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
974                                 goto __ok;
975         }
976         for (substream = pstr->substream; substream; substream = substream->next)
977                 if (!SUBSTREAM_BUSY(substream))
978                         break;
979       __ok:
980         if (substream == NULL)
981                 return -EAGAIN;
982 
983         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
984         if (runtime == NULL)
985                 return -ENOMEM;
986 
987         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
988         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
989         if (runtime->status == NULL) {
990                 kfree(runtime);
991                 return -ENOMEM;
992         }
993         memset((void*)runtime->status, 0, size);
994 
995         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
996         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
997         if (runtime->control == NULL) {
998                 snd_free_pages((void*)runtime->status,
999                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1000                 kfree(runtime);
1001                 return -ENOMEM;
1002         }
1003         memset((void*)runtime->control, 0, size);
1004 
1005         init_waitqueue_head(&runtime->sleep);
1006         init_waitqueue_head(&runtime->tsleep);
1007 
1008         runtime->status->state = SNDRV_PCM_STATE_OPEN;
1009 
1010         substream->runtime = runtime;
1011         substream->private_data = pcm->private_data;
1012         substream->ref_count = 1;
1013         substream->f_flags = file->f_flags;
1014         substream->pid = get_pid(task_pid(current));
1015         pstr->substream_opened++;
1016         *rsubstream = substream;
1017         return 0;
1018 }
1019 
1020 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1021 {
1022         struct snd_pcm_runtime *runtime;
1023 
1024         if (PCM_RUNTIME_CHECK(substream))
1025                 return;
1026         runtime = substream->runtime;
1027         if (runtime->private_free != NULL)
1028                 runtime->private_free(runtime);
1029         snd_free_pages((void*)runtime->status,
1030                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1031         snd_free_pages((void*)runtime->control,
1032                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1033         kfree(runtime->hw_constraints.rules);
1034 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
1035         kfree(runtime->hwptr_log);
1036 #endif
1037         kfree(runtime);
1038         substream->runtime = NULL;
1039         put_pid(substream->pid);
1040         substream->pid = NULL;
1041         substream->pstr->substream_opened--;
1042 }
1043 
1044 static ssize_t show_pcm_class(struct device *dev,
1045                               struct device_attribute *attr, char *buf)
1046 {
1047         struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1048         struct snd_pcm *pcm = pstr->pcm;
1049         const char *str;
1050         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1051                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1052                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1053                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1054                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1055         };
1056 
1057         if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1058                 str = "none";
1059         else
1060                 str = strs[pcm->dev_class];
1061         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1062 }
1063 
1064 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1065 static struct attribute *pcm_dev_attrs[] = {
1066         &dev_attr_pcm_class.attr,
1067         NULL
1068 };
1069 
1070 static struct attribute_group pcm_dev_attr_group = {
1071         .attrs  = pcm_dev_attrs,
1072 };
1073 
1074 static const struct attribute_group *pcm_dev_attr_groups[] = {
1075         &pcm_dev_attr_group,
1076         NULL
1077 };
1078 
1079 static int snd_pcm_dev_register(struct snd_device *device)
1080 {
1081         int cidx, err;
1082         struct snd_pcm_substream *substream;
1083         struct snd_pcm_notify *notify;
1084         struct snd_pcm *pcm;
1085 
1086         if (snd_BUG_ON(!device || !device->device_data))
1087                 return -ENXIO;
1088         pcm = device->device_data;
1089         mutex_lock(&register_mutex);
1090         err = snd_pcm_add(pcm);
1091         if (err) {
1092                 mutex_unlock(&register_mutex);
1093                 return err;
1094         }
1095         for (cidx = 0; cidx < 2; cidx++) {
1096                 int devtype = -1;
1097                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1098                         continue;
1099                 switch (cidx) {
1100                 case SNDRV_PCM_STREAM_PLAYBACK:
1101                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1102                         break;
1103                 case SNDRV_PCM_STREAM_CAPTURE:
1104                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1105                         break;
1106                 }
1107                 /* register pcm */
1108                 err = snd_register_device(devtype, pcm->card, pcm->device,
1109                                           &snd_pcm_f_ops[cidx], pcm,
1110                                           &pcm->streams[cidx].dev);
1111                 if (err < 0) {
1112                         list_del(&pcm->list);
1113                         mutex_unlock(&register_mutex);
1114                         return err;
1115                 }
1116 
1117                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1118                         snd_pcm_timer_init(substream);
1119         }
1120 
1121         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1122                 notify->n_register(pcm);
1123 
1124         mutex_unlock(&register_mutex);
1125         return 0;
1126 }
1127 
1128 static int snd_pcm_dev_disconnect(struct snd_device *device)
1129 {
1130         struct snd_pcm *pcm = device->device_data;
1131         struct snd_pcm_notify *notify;
1132         struct snd_pcm_substream *substream;
1133         int cidx;
1134 
1135         mutex_lock(&register_mutex);
1136         if (list_empty(&pcm->list))
1137                 goto unlock;
1138 
1139         mutex_lock(&pcm->open_mutex);
1140         wake_up(&pcm->open_wait);
1141         list_del_init(&pcm->list);
1142         for (cidx = 0; cidx < 2; cidx++)
1143                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1144                         snd_pcm_stream_lock_irq(substream);
1145                         if (substream->runtime) {
1146                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1147                                 wake_up(&substream->runtime->sleep);
1148                                 wake_up(&substream->runtime->tsleep);
1149                         }
1150                         snd_pcm_stream_unlock_irq(substream);
1151                 }
1152         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1153                 notify->n_disconnect(pcm);
1154         }
1155         for (cidx = 0; cidx < 2; cidx++) {
1156                 snd_unregister_device(&pcm->streams[cidx].dev);
1157                 if (pcm->streams[cidx].chmap_kctl) {
1158                         snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1159                         pcm->streams[cidx].chmap_kctl = NULL;
1160                 }
1161         }
1162         mutex_unlock(&pcm->open_mutex);
1163  unlock:
1164         mutex_unlock(&register_mutex);
1165         return 0;
1166 }
1167 
1168 /**
1169  * snd_pcm_notify - Add/remove the notify list
1170  * @notify: PCM notify list
1171  * @nfree: 0 = register, 1 = unregister
1172  *
1173  * This adds the given notifier to the global list so that the callback is
1174  * called for each registered PCM devices.  This exists only for PCM OSS
1175  * emulation, so far.
1176  */
1177 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1178 {
1179         struct snd_pcm *pcm;
1180 
1181         if (snd_BUG_ON(!notify ||
1182                        !notify->n_register ||
1183                        !notify->n_unregister ||
1184                        !notify->n_disconnect))
1185                 return -EINVAL;
1186         mutex_lock(&register_mutex);
1187         if (nfree) {
1188                 list_del(&notify->list);
1189                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1190                         notify->n_unregister(pcm);
1191         } else {
1192                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1193                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1194                         notify->n_register(pcm);
1195         }
1196         mutex_unlock(&register_mutex);
1197         return 0;
1198 }
1199 EXPORT_SYMBOL(snd_pcm_notify);
1200 
1201 #ifdef CONFIG_PROC_FS
1202 /*
1203  *  Info interface
1204  */
1205 
1206 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1207                               struct snd_info_buffer *buffer)
1208 {
1209         struct snd_pcm *pcm;
1210 
1211         mutex_lock(&register_mutex);
1212         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1213                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1214                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1215                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1216                         snd_iprintf(buffer, " : playback %i",
1217                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1218                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1219                         snd_iprintf(buffer, " : capture %i",
1220                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1221                 snd_iprintf(buffer, "\n");
1222         }
1223         mutex_unlock(&register_mutex);
1224 }
1225 
1226 static struct snd_info_entry *snd_pcm_proc_entry;
1227 
1228 static void snd_pcm_proc_init(void)
1229 {
1230         struct snd_info_entry *entry;
1231 
1232         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1233                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1234                 if (snd_info_register(entry) < 0) {
1235                         snd_info_free_entry(entry);
1236                         entry = NULL;
1237                 }
1238         }
1239         snd_pcm_proc_entry = entry;
1240 }
1241 
1242 static void snd_pcm_proc_done(void)
1243 {
1244         snd_info_free_entry(snd_pcm_proc_entry);
1245 }
1246 
1247 #else /* !CONFIG_PROC_FS */
1248 #define snd_pcm_proc_init()
1249 #define snd_pcm_proc_done()
1250 #endif /* CONFIG_PROC_FS */
1251 
1252 
1253 /*
1254  *  ENTRY functions
1255  */
1256 
1257 static int __init alsa_pcm_init(void)
1258 {
1259         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1260         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1261         snd_pcm_proc_init();
1262         return 0;
1263 }
1264 
1265 static void __exit alsa_pcm_exit(void)
1266 {
1267         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1268         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1269         snd_pcm_proc_done();
1270 }
1271 
1272 module_init(alsa_pcm_init)
1273 module_exit(alsa_pcm_exit)
1274 

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