~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.9 ] ~ [ linux-5.8.14 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.70 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.150 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.200 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.238 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.238 ] ~ [ 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-3.16.85 ] ~ [ 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-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->prefer_pcm_subdevice = 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 };
219 
220 const char *snd_pcm_format_name(snd_pcm_format_t format)
221 {
222         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
223                 return "Unknown";
224         return snd_pcm_format_names[(__force unsigned int)format];
225 }
226 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
227 
228 #ifdef CONFIG_SND_VERBOSE_PROCFS
229 
230 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
231 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
232 #define READY(v) [SNDRV_PCM_READY_##v] = #v
233 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
234 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
235 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
236 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
237 #define START(v) [SNDRV_PCM_START_##v] = #v
238 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
239 
240 static char *snd_pcm_stream_names[] = {
241         STREAM(PLAYBACK),
242         STREAM(CAPTURE),
243 };
244 
245 static char *snd_pcm_state_names[] = {
246         STATE(OPEN),
247         STATE(SETUP),
248         STATE(PREPARED),
249         STATE(RUNNING),
250         STATE(XRUN),
251         STATE(DRAINING),
252         STATE(PAUSED),
253         STATE(SUSPENDED),
254 };
255 
256 static char *snd_pcm_access_names[] = {
257         ACCESS(MMAP_INTERLEAVED), 
258         ACCESS(MMAP_NONINTERLEAVED),
259         ACCESS(MMAP_COMPLEX),
260         ACCESS(RW_INTERLEAVED),
261         ACCESS(RW_NONINTERLEAVED),
262 };
263 
264 static char *snd_pcm_subformat_names[] = {
265         SUBFORMAT(STD), 
266 };
267 
268 static char *snd_pcm_tstamp_mode_names[] = {
269         TSTAMP(NONE),
270         TSTAMP(ENABLE),
271 };
272 
273 static const char *snd_pcm_stream_name(int stream)
274 {
275         return snd_pcm_stream_names[stream];
276 }
277 
278 static const char *snd_pcm_access_name(snd_pcm_access_t access)
279 {
280         return snd_pcm_access_names[(__force int)access];
281 }
282 
283 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
284 {
285         return snd_pcm_subformat_names[(__force int)subformat];
286 }
287 
288 static const char *snd_pcm_tstamp_mode_name(int mode)
289 {
290         return snd_pcm_tstamp_mode_names[mode];
291 }
292 
293 static const char *snd_pcm_state_name(snd_pcm_state_t state)
294 {
295         return snd_pcm_state_names[(__force int)state];
296 }
297 
298 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
299 #include <linux/soundcard.h>
300 
301 static const char *snd_pcm_oss_format_name(int format)
302 {
303         switch (format) {
304         case AFMT_MU_LAW:
305                 return "MU_LAW";
306         case AFMT_A_LAW:
307                 return "A_LAW";
308         case AFMT_IMA_ADPCM:
309                 return "IMA_ADPCM";
310         case AFMT_U8:
311                 return "U8";
312         case AFMT_S16_LE:
313                 return "S16_LE";
314         case AFMT_S16_BE:
315                 return "S16_BE";
316         case AFMT_S8:
317                 return "S8";
318         case AFMT_U16_LE:
319                 return "U16_LE";
320         case AFMT_U16_BE:
321                 return "U16_BE";
322         case AFMT_MPEG:
323                 return "MPEG";
324         default:
325                 return "unknown";
326         }
327 }
328 #endif
329 
330 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
331                                    struct snd_info_buffer *buffer)
332 {
333         struct snd_pcm_info *info;
334         int err;
335 
336         if (! substream)
337                 return;
338 
339         info = kmalloc(sizeof(*info), GFP_KERNEL);
340         if (! info) {
341                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
342                 return;
343         }
344 
345         err = snd_pcm_info(substream, info);
346         if (err < 0) {
347                 snd_iprintf(buffer, "error %d\n", err);
348                 kfree(info);
349                 return;
350         }
351         snd_iprintf(buffer, "card: %d\n", info->card);
352         snd_iprintf(buffer, "device: %d\n", info->device);
353         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
354         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
355         snd_iprintf(buffer, "id: %s\n", info->id);
356         snd_iprintf(buffer, "name: %s\n", info->name);
357         snd_iprintf(buffer, "subname: %s\n", info->subname);
358         snd_iprintf(buffer, "class: %d\n", info->dev_class);
359         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
360         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
361         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
362         kfree(info);
363 }
364 
365 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
366                                           struct snd_info_buffer *buffer)
367 {
368         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
369                                buffer);
370 }
371 
372 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
373                                              struct snd_info_buffer *buffer)
374 {
375         snd_pcm_proc_info_read(entry->private_data, buffer);
376 }
377 
378 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
379                                                   struct snd_info_buffer *buffer)
380 {
381         struct snd_pcm_substream *substream = entry->private_data;
382         struct snd_pcm_runtime *runtime;
383 
384         mutex_lock(&substream->pcm->open_mutex);
385         runtime = substream->runtime;
386         if (!runtime) {
387                 snd_iprintf(buffer, "closed\n");
388                 goto unlock;
389         }
390         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
391                 snd_iprintf(buffer, "no setup\n");
392                 goto unlock;
393         }
394         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
395         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
396         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
397         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
398         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
399         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
400         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
401 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
402         if (substream->oss.oss) {
403                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
404                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
405                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
406                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
407                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
408                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
409         }
410 #endif
411  unlock:
412         mutex_unlock(&substream->pcm->open_mutex);
413 }
414 
415 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
416                                                   struct snd_info_buffer *buffer)
417 {
418         struct snd_pcm_substream *substream = entry->private_data;
419         struct snd_pcm_runtime *runtime;
420 
421         mutex_lock(&substream->pcm->open_mutex);
422         runtime = substream->runtime;
423         if (!runtime) {
424                 snd_iprintf(buffer, "closed\n");
425                 goto unlock;
426         }
427         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
428                 snd_iprintf(buffer, "no setup\n");
429                 goto unlock;
430         }
431         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
432         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
433         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
434         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
435         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
436         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
437         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
438         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
439  unlock:
440         mutex_unlock(&substream->pcm->open_mutex);
441 }
442 
443 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
444                                                struct snd_info_buffer *buffer)
445 {
446         struct snd_pcm_substream *substream = entry->private_data;
447         struct snd_pcm_runtime *runtime;
448         struct snd_pcm_status status;
449         int err;
450 
451         mutex_lock(&substream->pcm->open_mutex);
452         runtime = substream->runtime;
453         if (!runtime) {
454                 snd_iprintf(buffer, "closed\n");
455                 goto unlock;
456         }
457         memset(&status, 0, sizeof(status));
458         err = snd_pcm_status(substream, &status);
459         if (err < 0) {
460                 snd_iprintf(buffer, "error %d\n", err);
461                 goto unlock;
462         }
463         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
464         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
465         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
466                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
467         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
468                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
469         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
470         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
471         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
472         snd_iprintf(buffer, "-----\n");
473         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
474         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
475  unlock:
476         mutex_unlock(&substream->pcm->open_mutex);
477 }
478 
479 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
480 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
481                                     struct snd_info_buffer *buffer)
482 {
483         struct snd_pcm_str *pstr = entry->private_data;
484         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
485 }
486 
487 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
488                                      struct snd_info_buffer *buffer)
489 {
490         struct snd_pcm_str *pstr = entry->private_data;
491         char line[64];
492         if (!snd_info_get_line(buffer, line, sizeof(line)))
493                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
494 }
495 #endif
496 
497 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
498 {
499         struct snd_pcm *pcm = pstr->pcm;
500         struct snd_info_entry *entry;
501         char name[16];
502 
503         sprintf(name, "pcm%i%c", pcm->device, 
504                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
505         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
506                 return -ENOMEM;
507         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
508         if (snd_info_register(entry) < 0) {
509                 snd_info_free_entry(entry);
510                 return -ENOMEM;
511         }
512         pstr->proc_root = entry;
513 
514         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
515                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
516                 if (snd_info_register(entry) < 0) {
517                         snd_info_free_entry(entry);
518                         entry = NULL;
519                 }
520         }
521         pstr->proc_info_entry = entry;
522 
523 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
524         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
525                                                 pstr->proc_root)) != NULL) {
526                 entry->c.text.read = snd_pcm_xrun_debug_read;
527                 entry->c.text.write = snd_pcm_xrun_debug_write;
528                 entry->mode |= S_IWUSR;
529                 entry->private_data = pstr;
530                 if (snd_info_register(entry) < 0) {
531                         snd_info_free_entry(entry);
532                         entry = NULL;
533                 }
534         }
535         pstr->proc_xrun_debug_entry = entry;
536 #endif
537         return 0;
538 }
539 
540 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
541 {
542 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
543         snd_info_free_entry(pstr->proc_xrun_debug_entry);
544         pstr->proc_xrun_debug_entry = NULL;
545 #endif
546         snd_info_free_entry(pstr->proc_info_entry);
547         pstr->proc_info_entry = NULL;
548         snd_info_free_entry(pstr->proc_root);
549         pstr->proc_root = NULL;
550         return 0;
551 }
552 
553 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
554 {
555         struct snd_info_entry *entry;
556         struct snd_card *card;
557         char name[16];
558 
559         card = substream->pcm->card;
560 
561         sprintf(name, "sub%i", substream->number);
562         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
563                 return -ENOMEM;
564         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
565         if (snd_info_register(entry) < 0) {
566                 snd_info_free_entry(entry);
567                 return -ENOMEM;
568         }
569         substream->proc_root = entry;
570 
571         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
572                 snd_info_set_text_ops(entry, substream,
573                                       snd_pcm_substream_proc_info_read);
574                 if (snd_info_register(entry) < 0) {
575                         snd_info_free_entry(entry);
576                         entry = NULL;
577                 }
578         }
579         substream->proc_info_entry = entry;
580 
581         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
582                 snd_info_set_text_ops(entry, substream,
583                                       snd_pcm_substream_proc_hw_params_read);
584                 if (snd_info_register(entry) < 0) {
585                         snd_info_free_entry(entry);
586                         entry = NULL;
587                 }
588         }
589         substream->proc_hw_params_entry = entry;
590 
591         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
592                 snd_info_set_text_ops(entry, substream,
593                                       snd_pcm_substream_proc_sw_params_read);
594                 if (snd_info_register(entry) < 0) {
595                         snd_info_free_entry(entry);
596                         entry = NULL;
597                 }
598         }
599         substream->proc_sw_params_entry = entry;
600 
601         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
602                 snd_info_set_text_ops(entry, substream,
603                                       snd_pcm_substream_proc_status_read);
604                 if (snd_info_register(entry) < 0) {
605                         snd_info_free_entry(entry);
606                         entry = NULL;
607                 }
608         }
609         substream->proc_status_entry = entry;
610 
611         return 0;
612 }
613 
614 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
615 {
616         snd_info_free_entry(substream->proc_info_entry);
617         substream->proc_info_entry = NULL;
618         snd_info_free_entry(substream->proc_hw_params_entry);
619         substream->proc_hw_params_entry = NULL;
620         snd_info_free_entry(substream->proc_sw_params_entry);
621         substream->proc_sw_params_entry = NULL;
622         snd_info_free_entry(substream->proc_status_entry);
623         substream->proc_status_entry = NULL;
624         snd_info_free_entry(substream->proc_root);
625         substream->proc_root = NULL;
626         return 0;
627 }
628 #else /* !CONFIG_SND_VERBOSE_PROCFS */
629 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
630 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
631 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
632 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
633 #endif /* CONFIG_SND_VERBOSE_PROCFS */
634 
635 /**
636  * snd_pcm_new_stream - create a new PCM stream
637  * @pcm: the pcm instance
638  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
639  * @substream_count: the number of substreams
640  *
641  * Creates a new stream for the pcm.
642  * The corresponding stream on the pcm must have been empty before
643  * calling this, i.e. zero must be given to the argument of
644  * snd_pcm_new().
645  *
646  * Return: Zero if successful, or a negative error code on failure.
647  */
648 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
649 {
650         int idx, err;
651         struct snd_pcm_str *pstr = &pcm->streams[stream];
652         struct snd_pcm_substream *substream, *prev;
653 
654 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
655         mutex_init(&pstr->oss.setup_mutex);
656 #endif
657         pstr->stream = stream;
658         pstr->pcm = pcm;
659         pstr->substream_count = substream_count;
660         if (substream_count > 0 && !pcm->internal) {
661                 err = snd_pcm_stream_proc_init(pstr);
662                 if (err < 0) {
663                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
664                         return err;
665                 }
666         }
667         prev = NULL;
668         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
669                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
670                 if (substream == NULL) {
671                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
672                         return -ENOMEM;
673                 }
674                 substream->pcm = pcm;
675                 substream->pstr = pstr;
676                 substream->number = idx;
677                 substream->stream = stream;
678                 sprintf(substream->name, "subdevice #%i", idx);
679                 substream->buffer_bytes_max = UINT_MAX;
680                 if (prev == NULL)
681                         pstr->substream = substream;
682                 else
683                         prev->next = substream;
684 
685                 if (!pcm->internal) {
686                         err = snd_pcm_substream_proc_init(substream);
687                         if (err < 0) {
688                                 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
689                                 if (prev == NULL)
690                                         pstr->substream = NULL;
691                                 else
692                                         prev->next = NULL;
693                                 kfree(substream);
694                                 return err;
695                         }
696                 }
697                 substream->group = &substream->self_group;
698                 spin_lock_init(&substream->self_group.lock);
699                 INIT_LIST_HEAD(&substream->self_group.substreams);
700                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
701                 atomic_set(&substream->mmap_count, 0);
702                 prev = substream;
703         }
704         return 0;
705 }                               
706 
707 EXPORT_SYMBOL(snd_pcm_new_stream);
708 
709 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
710                 int playback_count, int capture_count, bool internal,
711                 struct snd_pcm **rpcm)
712 {
713         struct snd_pcm *pcm;
714         int err;
715         static struct snd_device_ops ops = {
716                 .dev_free = snd_pcm_dev_free,
717                 .dev_register = snd_pcm_dev_register,
718                 .dev_disconnect = snd_pcm_dev_disconnect,
719         };
720 
721         if (snd_BUG_ON(!card))
722                 return -ENXIO;
723         if (rpcm)
724                 *rpcm = NULL;
725         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
726         if (pcm == NULL) {
727                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
728                 return -ENOMEM;
729         }
730         pcm->card = card;
731         pcm->device = device;
732         pcm->internal = internal;
733         if (id)
734                 strlcpy(pcm->id, id, sizeof(pcm->id));
735         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
736                 snd_pcm_free(pcm);
737                 return err;
738         }
739         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
740                 snd_pcm_free(pcm);
741                 return err;
742         }
743         mutex_init(&pcm->open_mutex);
744         init_waitqueue_head(&pcm->open_wait);
745         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
746                 snd_pcm_free(pcm);
747                 return err;
748         }
749         if (rpcm)
750                 *rpcm = pcm;
751         return 0;
752 }
753 
754 /**
755  * snd_pcm_new - create a new PCM instance
756  * @card: the card instance
757  * @id: the id string
758  * @device: the device index (zero based)
759  * @playback_count: the number of substreams for playback
760  * @capture_count: the number of substreams for capture
761  * @rpcm: the pointer to store the new pcm instance
762  *
763  * Creates a new PCM instance.
764  *
765  * The pcm operators have to be set afterwards to the new instance
766  * via snd_pcm_set_ops().
767  *
768  * Return: Zero if successful, or a negative error code on failure.
769  */
770 int snd_pcm_new(struct snd_card *card, const char *id, int device,
771                 int playback_count, int capture_count, struct snd_pcm **rpcm)
772 {
773         return _snd_pcm_new(card, id, device, playback_count, capture_count,
774                         false, rpcm);
775 }
776 EXPORT_SYMBOL(snd_pcm_new);
777 
778 /**
779  * snd_pcm_new_internal - create a new internal PCM instance
780  * @card: the card instance
781  * @id: the id string
782  * @device: the device index (zero based - shared with normal PCMs)
783  * @playback_count: the number of substreams for playback
784  * @capture_count: the number of substreams for capture
785  * @rpcm: the pointer to store the new pcm instance
786  *
787  * Creates a new internal PCM instance with no userspace device or procfs
788  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
789  * will only be used internally by kernel drivers. i.e. it cannot be opened
790  * by userspace. It provides existing ASoC components drivers with a substream
791  * and access to any private data.
792  *
793  * The pcm operators have to be set afterwards to the new instance
794  * via snd_pcm_set_ops().
795  *
796  * Return: Zero if successful, or a negative error code on failure.
797  */
798 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
799         int playback_count, int capture_count,
800         struct snd_pcm **rpcm)
801 {
802         return _snd_pcm_new(card, id, device, playback_count, capture_count,
803                         true, rpcm);
804 }
805 EXPORT_SYMBOL(snd_pcm_new_internal);
806 
807 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
808 {
809         struct snd_pcm_substream *substream, *substream_next;
810 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
811         struct snd_pcm_oss_setup *setup, *setupn;
812 #endif
813         substream = pstr->substream;
814         while (substream) {
815                 substream_next = substream->next;
816                 snd_pcm_timer_done(substream);
817                 snd_pcm_substream_proc_done(substream);
818                 kfree(substream);
819                 substream = substream_next;
820         }
821         snd_pcm_stream_proc_done(pstr);
822 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
823         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
824                 setupn = setup->next;
825                 kfree(setup->task_name);
826                 kfree(setup);
827         }
828 #endif
829 }
830 
831 static int snd_pcm_free(struct snd_pcm *pcm)
832 {
833         struct snd_pcm_notify *notify;
834 
835         if (!pcm)
836                 return 0;
837         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
838                 notify->n_unregister(pcm);
839         }
840         if (pcm->private_free)
841                 pcm->private_free(pcm);
842         snd_pcm_lib_preallocate_free_for_all(pcm);
843         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
844         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
845         kfree(pcm);
846         return 0;
847 }
848 
849 static int snd_pcm_dev_free(struct snd_device *device)
850 {
851         struct snd_pcm *pcm = device->device_data;
852         return snd_pcm_free(pcm);
853 }
854 
855 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
856                              struct file *file,
857                              struct snd_pcm_substream **rsubstream)
858 {
859         struct snd_pcm_str * pstr;
860         struct snd_pcm_substream *substream;
861         struct snd_pcm_runtime *runtime;
862         struct snd_ctl_file *kctl;
863         struct snd_card *card;
864         int prefer_subdevice = -1;
865         size_t size;
866 
867         if (snd_BUG_ON(!pcm || !rsubstream))
868                 return -ENXIO;
869         *rsubstream = NULL;
870         pstr = &pcm->streams[stream];
871         if (pstr->substream == NULL || pstr->substream_count == 0)
872                 return -ENODEV;
873 
874         card = pcm->card;
875         read_lock(&card->ctl_files_rwlock);
876         list_for_each_entry(kctl, &card->ctl_files, list) {
877                 if (kctl->pid == task_pid(current)) {
878                         prefer_subdevice = kctl->prefer_pcm_subdevice;
879                         if (prefer_subdevice != -1)
880                                 break;
881                 }
882         }
883         read_unlock(&card->ctl_files_rwlock);
884 
885         switch (stream) {
886         case SNDRV_PCM_STREAM_PLAYBACK:
887                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
888                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
889                                 if (SUBSTREAM_BUSY(substream))
890                                         return -EAGAIN;
891                         }
892                 }
893                 break;
894         case SNDRV_PCM_STREAM_CAPTURE:
895                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
896                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
897                                 if (SUBSTREAM_BUSY(substream))
898                                         return -EAGAIN;
899                         }
900                 }
901                 break;
902         default:
903                 return -EINVAL;
904         }
905 
906         if (file->f_flags & O_APPEND) {
907                 if (prefer_subdevice < 0) {
908                         if (pstr->substream_count > 1)
909                                 return -EINVAL; /* must be unique */
910                         substream = pstr->substream;
911                 } else {
912                         for (substream = pstr->substream; substream;
913                              substream = substream->next)
914                                 if (substream->number == prefer_subdevice)
915                                         break;
916                 }
917                 if (! substream)
918                         return -ENODEV;
919                 if (! SUBSTREAM_BUSY(substream))
920                         return -EBADFD;
921                 substream->ref_count++;
922                 *rsubstream = substream;
923                 return 0;
924         }
925 
926         if (prefer_subdevice >= 0) {
927                 for (substream = pstr->substream; substream; substream = substream->next)
928                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
929                                 goto __ok;
930         }
931         for (substream = pstr->substream; substream; substream = substream->next)
932                 if (!SUBSTREAM_BUSY(substream))
933                         break;
934       __ok:
935         if (substream == NULL)
936                 return -EAGAIN;
937 
938         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
939         if (runtime == NULL)
940                 return -ENOMEM;
941 
942         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
943         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
944         if (runtime->status == NULL) {
945                 kfree(runtime);
946                 return -ENOMEM;
947         }
948         memset((void*)runtime->status, 0, size);
949 
950         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
951         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
952         if (runtime->control == NULL) {
953                 snd_free_pages((void*)runtime->status,
954                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
955                 kfree(runtime);
956                 return -ENOMEM;
957         }
958         memset((void*)runtime->control, 0, size);
959 
960         init_waitqueue_head(&runtime->sleep);
961         init_waitqueue_head(&runtime->tsleep);
962 
963         runtime->status->state = SNDRV_PCM_STATE_OPEN;
964 
965         substream->runtime = runtime;
966         substream->private_data = pcm->private_data;
967         substream->ref_count = 1;
968         substream->f_flags = file->f_flags;
969         substream->pid = get_pid(task_pid(current));
970         pstr->substream_opened++;
971         *rsubstream = substream;
972         return 0;
973 }
974 
975 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
976 {
977         struct snd_pcm_runtime *runtime;
978 
979         if (PCM_RUNTIME_CHECK(substream))
980                 return;
981         runtime = substream->runtime;
982         if (runtime->private_free != NULL)
983                 runtime->private_free(runtime);
984         snd_free_pages((void*)runtime->status,
985                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
986         snd_free_pages((void*)runtime->control,
987                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
988         kfree(runtime->hw_constraints.rules);
989 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
990         kfree(runtime->hwptr_log);
991 #endif
992         kfree(runtime);
993         substream->runtime = NULL;
994         put_pid(substream->pid);
995         substream->pid = NULL;
996         substream->pstr->substream_opened--;
997 }
998 
999 static ssize_t show_pcm_class(struct device *dev,
1000                               struct device_attribute *attr, char *buf)
1001 {
1002         struct snd_pcm *pcm;
1003         const char *str;
1004         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1005                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1006                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1007                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1008                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1009         };
1010 
1011         if (! (pcm = dev_get_drvdata(dev)) ||
1012             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1013                 str = "none";
1014         else
1015                 str = strs[pcm->dev_class];
1016         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1017 }
1018 
1019 static struct device_attribute pcm_attrs =
1020         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1021 
1022 static int snd_pcm_dev_register(struct snd_device *device)
1023 {
1024         int cidx, err;
1025         struct snd_pcm_substream *substream;
1026         struct snd_pcm_notify *notify;
1027         char str[16];
1028         struct snd_pcm *pcm;
1029         struct device *dev;
1030 
1031         if (snd_BUG_ON(!device || !device->device_data))
1032                 return -ENXIO;
1033         pcm = device->device_data;
1034         mutex_lock(&register_mutex);
1035         err = snd_pcm_add(pcm);
1036         if (err) {
1037                 mutex_unlock(&register_mutex);
1038                 return err;
1039         }
1040         for (cidx = 0; cidx < 2; cidx++) {
1041                 int devtype = -1;
1042                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1043                         continue;
1044                 switch (cidx) {
1045                 case SNDRV_PCM_STREAM_PLAYBACK:
1046                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1047                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1048                         break;
1049                 case SNDRV_PCM_STREAM_CAPTURE:
1050                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1051                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1052                         break;
1053                 }
1054                 /* device pointer to use, pcm->dev takes precedence if
1055                  * it is assigned, otherwise fall back to card's device
1056                  * if possible */
1057                 dev = pcm->dev;
1058                 if (!dev)
1059                         dev = snd_card_get_device_link(pcm->card);
1060                 /* register pcm */
1061                 err = snd_register_device_for_dev(devtype, pcm->card,
1062                                                   pcm->device,
1063                                                   &snd_pcm_f_ops[cidx],
1064                                                   pcm, str, dev);
1065                 if (err < 0) {
1066                         list_del(&pcm->list);
1067                         mutex_unlock(&register_mutex);
1068                         return err;
1069                 }
1070                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1071                                           &pcm_attrs);
1072                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1073                         snd_pcm_timer_init(substream);
1074         }
1075 
1076         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1077                 notify->n_register(pcm);
1078 
1079         mutex_unlock(&register_mutex);
1080         return 0;
1081 }
1082 
1083 static int snd_pcm_dev_disconnect(struct snd_device *device)
1084 {
1085         struct snd_pcm *pcm = device->device_data;
1086         struct snd_pcm_notify *notify;
1087         struct snd_pcm_substream *substream;
1088         int cidx, devtype;
1089 
1090         mutex_lock(&register_mutex);
1091         if (list_empty(&pcm->list))
1092                 goto unlock;
1093 
1094         mutex_lock(&pcm->open_mutex);
1095         wake_up(&pcm->open_wait);
1096         list_del_init(&pcm->list);
1097         for (cidx = 0; cidx < 2; cidx++)
1098                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1099                         snd_pcm_stream_lock_irq(substream);
1100                         if (substream->runtime) {
1101                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1102                                 wake_up(&substream->runtime->sleep);
1103                                 wake_up(&substream->runtime->tsleep);
1104                         }
1105                         snd_pcm_stream_unlock_irq(substream);
1106                 }
1107         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1108                 notify->n_disconnect(pcm);
1109         }
1110         for (cidx = 0; cidx < 2; cidx++) {
1111                 devtype = -1;
1112                 switch (cidx) {
1113                 case SNDRV_PCM_STREAM_PLAYBACK:
1114                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1115                         break;
1116                 case SNDRV_PCM_STREAM_CAPTURE:
1117                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1118                         break;
1119                 }
1120                 snd_unregister_device(devtype, pcm->card, pcm->device);
1121                 if (pcm->streams[cidx].chmap_kctl) {
1122                         snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1123                         pcm->streams[cidx].chmap_kctl = NULL;
1124                 }
1125         }
1126         mutex_unlock(&pcm->open_mutex);
1127  unlock:
1128         mutex_unlock(&register_mutex);
1129         return 0;
1130 }
1131 
1132 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1133 {
1134         struct snd_pcm *pcm;
1135 
1136         if (snd_BUG_ON(!notify ||
1137                        !notify->n_register ||
1138                        !notify->n_unregister ||
1139                        !notify->n_disconnect))
1140                 return -EINVAL;
1141         mutex_lock(&register_mutex);
1142         if (nfree) {
1143                 list_del(&notify->list);
1144                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145                         notify->n_unregister(pcm);
1146         } else {
1147                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1148                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1149                         notify->n_register(pcm);
1150         }
1151         mutex_unlock(&register_mutex);
1152         return 0;
1153 }
1154 
1155 EXPORT_SYMBOL(snd_pcm_notify);
1156 
1157 #ifdef CONFIG_PROC_FS
1158 /*
1159  *  Info interface
1160  */
1161 
1162 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1163                               struct snd_info_buffer *buffer)
1164 {
1165         struct snd_pcm *pcm;
1166 
1167         mutex_lock(&register_mutex);
1168         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1169                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1170                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1171                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1172                         snd_iprintf(buffer, " : playback %i",
1173                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1174                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1175                         snd_iprintf(buffer, " : capture %i",
1176                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1177                 snd_iprintf(buffer, "\n");
1178         }
1179         mutex_unlock(&register_mutex);
1180 }
1181 
1182 static struct snd_info_entry *snd_pcm_proc_entry;
1183 
1184 static void snd_pcm_proc_init(void)
1185 {
1186         struct snd_info_entry *entry;
1187 
1188         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1189                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1190                 if (snd_info_register(entry) < 0) {
1191                         snd_info_free_entry(entry);
1192                         entry = NULL;
1193                 }
1194         }
1195         snd_pcm_proc_entry = entry;
1196 }
1197 
1198 static void snd_pcm_proc_done(void)
1199 {
1200         snd_info_free_entry(snd_pcm_proc_entry);
1201 }
1202 
1203 #else /* !CONFIG_PROC_FS */
1204 #define snd_pcm_proc_init()
1205 #define snd_pcm_proc_done()
1206 #endif /* CONFIG_PROC_FS */
1207 
1208 
1209 /*
1210  *  ENTRY functions
1211  */
1212 
1213 static int __init alsa_pcm_init(void)
1214 {
1215         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1216         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1217         snd_pcm_proc_init();
1218         return 0;
1219 }
1220 
1221 static void __exit alsa_pcm_exit(void)
1222 {
1223         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1224         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1225         snd_pcm_proc_done();
1226 }
1227 
1228 module_init(alsa_pcm_init)
1229 module_exit(alsa_pcm_exit)
1230 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp