Merge tag 'device-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg...
[linux-2.6.git] / sound / core / pcm.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/pcm.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33
34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
35 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36 MODULE_LICENSE("GPL");
37
38 static LIST_HEAD(snd_pcm_devices);
39 static LIST_HEAD(snd_pcm_notify_list);
40 static DEFINE_MUTEX(register_mutex);
41
42 static int snd_pcm_free(struct snd_pcm *pcm);
43 static int snd_pcm_dev_free(struct snd_device *device);
44 static int snd_pcm_dev_register(struct snd_device *device);
45 static int snd_pcm_dev_disconnect(struct snd_device *device);
46
47 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
48 {
49         struct snd_pcm *pcm;
50
51         list_for_each_entry(pcm, &snd_pcm_devices, list) {
52                 if (pcm->card == card && pcm->device == device)
53                         return pcm;
54         }
55         return NULL;
56 }
57
58 static int snd_pcm_next(struct snd_card *card, int device)
59 {
60         struct snd_pcm *pcm;
61
62         list_for_each_entry(pcm, &snd_pcm_devices, list) {
63                 if (pcm->card == card && pcm->device > device)
64                         return pcm->device;
65                 else if (pcm->card->number > card->number)
66                         return -1;
67         }
68         return -1;
69 }
70
71 static int snd_pcm_add(struct snd_pcm *newpcm)
72 {
73         struct snd_pcm *pcm;
74
75         list_for_each_entry(pcm, &snd_pcm_devices, list) {
76                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
77                         return -EBUSY;
78                 if (pcm->card->number > newpcm->card->number ||
79                                 (pcm->card == newpcm->card &&
80                                 pcm->device > newpcm->device)) {
81                         list_add(&newpcm->list, pcm->list.prev);
82                         return 0;
83                 }
84         }
85         list_add_tail(&newpcm->list, &snd_pcm_devices);
86         return 0;
87 }
88
89 static int snd_pcm_control_ioctl(struct snd_card *card,
90                                  struct snd_ctl_file *control,
91                                  unsigned int cmd, unsigned long arg)
92 {
93         switch (cmd) {
94         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
95                 {
96                         int device;
97
98                         if (get_user(device, (int __user *)arg))
99                                 return -EFAULT;
100                         mutex_lock(&register_mutex);
101                         device = snd_pcm_next(card, device);
102                         mutex_unlock(&register_mutex);
103                         if (put_user(device, (int __user *)arg))
104                                 return -EFAULT;
105                         return 0;
106                 }
107         case SNDRV_CTL_IOCTL_PCM_INFO:
108                 {
109                         struct snd_pcm_info __user *info;
110                         unsigned int device, subdevice;
111                         int stream;
112                         struct snd_pcm *pcm;
113                         struct snd_pcm_str *pstr;
114                         struct snd_pcm_substream *substream;
115                         int err;
116
117                         info = (struct snd_pcm_info __user *)arg;
118                         if (get_user(device, &info->device))
119                                 return -EFAULT;
120                         if (get_user(stream, &info->stream))
121                                 return -EFAULT;
122                         if (stream < 0 || stream > 1)
123                                 return -EINVAL;
124                         if (get_user(subdevice, &info->subdevice))
125                                 return -EFAULT;
126                         mutex_lock(&register_mutex);
127                         pcm = snd_pcm_get(card, device);
128                         if (pcm == NULL) {
129                                 err = -ENXIO;
130                                 goto _error;
131                         }
132                         pstr = &pcm->streams[stream];
133                         if (pstr->substream_count == 0) {
134                                 err = -ENOENT;
135                                 goto _error;
136                         }
137                         if (subdevice >= pstr->substream_count) {
138                                 err = -ENXIO;
139                                 goto _error;
140                         }
141                         for (substream = pstr->substream; substream;
142                              substream = substream->next)
143                                 if (substream->number == (int)subdevice)
144                                         break;
145                         if (substream == NULL) {
146                                 err = -ENXIO;
147                                 goto _error;
148                         }
149                         err = snd_pcm_info_user(substream, info);
150                 _error:
151                         mutex_unlock(&register_mutex);
152                         return err;
153                 }
154         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
155                 {
156                         int val;
157                         
158                         if (get_user(val, (int __user *)arg))
159                                 return -EFAULT;
160                         control->prefer_pcm_subdevice = val;
161                         return 0;
162                 }
163         }
164         return -ENOIOCTLCMD;
165 }
166
167 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
168
169 static char *snd_pcm_format_names[] = {
170         FORMAT(S8),
171         FORMAT(U8),
172         FORMAT(S16_LE),
173         FORMAT(S16_BE),
174         FORMAT(U16_LE),
175         FORMAT(U16_BE),
176         FORMAT(S24_LE),
177         FORMAT(S24_BE),
178         FORMAT(U24_LE),
179         FORMAT(U24_BE),
180         FORMAT(S32_LE),
181         FORMAT(S32_BE),
182         FORMAT(U32_LE),
183         FORMAT(U32_BE),
184         FORMAT(FLOAT_LE),
185         FORMAT(FLOAT_BE),
186         FORMAT(FLOAT64_LE),
187         FORMAT(FLOAT64_BE),
188         FORMAT(IEC958_SUBFRAME_LE),
189         FORMAT(IEC958_SUBFRAME_BE),
190         FORMAT(MU_LAW),
191         FORMAT(A_LAW),
192         FORMAT(IMA_ADPCM),
193         FORMAT(MPEG),
194         FORMAT(GSM),
195         FORMAT(SPECIAL),
196         FORMAT(S24_3LE),
197         FORMAT(S24_3BE),
198         FORMAT(U24_3LE),
199         FORMAT(U24_3BE),
200         FORMAT(S20_3LE),
201         FORMAT(S20_3BE),
202         FORMAT(U20_3LE),
203         FORMAT(U20_3BE),
204         FORMAT(S18_3LE),
205         FORMAT(S18_3BE),
206         FORMAT(U18_3LE),
207         FORMAT(U18_3BE),
208         FORMAT(G723_24),
209         FORMAT(G723_24_1B),
210         FORMAT(G723_40),
211         FORMAT(G723_40_1B),
212 };
213
214 const char *snd_pcm_format_name(snd_pcm_format_t format)
215 {
216         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
217                 return "Unknown";
218         return snd_pcm_format_names[(__force unsigned int)format];
219 }
220 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
221
222 #ifdef CONFIG_SND_VERBOSE_PROCFS
223
224 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
225 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
226 #define READY(v) [SNDRV_PCM_READY_##v] = #v
227 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
228 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
229 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
230 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
231 #define START(v) [SNDRV_PCM_START_##v] = #v
232 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
233
234 static char *snd_pcm_stream_names[] = {
235         STREAM(PLAYBACK),
236         STREAM(CAPTURE),
237 };
238
239 static char *snd_pcm_state_names[] = {
240         STATE(OPEN),
241         STATE(SETUP),
242         STATE(PREPARED),
243         STATE(RUNNING),
244         STATE(XRUN),
245         STATE(DRAINING),
246         STATE(PAUSED),
247         STATE(SUSPENDED),
248 };
249
250 static char *snd_pcm_access_names[] = {
251         ACCESS(MMAP_INTERLEAVED), 
252         ACCESS(MMAP_NONINTERLEAVED),
253         ACCESS(MMAP_COMPLEX),
254         ACCESS(RW_INTERLEAVED),
255         ACCESS(RW_NONINTERLEAVED),
256 };
257
258 static char *snd_pcm_subformat_names[] = {
259         SUBFORMAT(STD), 
260 };
261
262 static char *snd_pcm_tstamp_mode_names[] = {
263         TSTAMP(NONE),
264         TSTAMP(ENABLE),
265 };
266
267 static const char *snd_pcm_stream_name(int stream)
268 {
269         return snd_pcm_stream_names[stream];
270 }
271
272 static const char *snd_pcm_access_name(snd_pcm_access_t access)
273 {
274         return snd_pcm_access_names[(__force int)access];
275 }
276
277 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
278 {
279         return snd_pcm_subformat_names[(__force int)subformat];
280 }
281
282 static const char *snd_pcm_tstamp_mode_name(int mode)
283 {
284         return snd_pcm_tstamp_mode_names[mode];
285 }
286
287 static const char *snd_pcm_state_name(snd_pcm_state_t state)
288 {
289         return snd_pcm_state_names[(__force int)state];
290 }
291
292 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
293 #include <linux/soundcard.h>
294
295 static const char *snd_pcm_oss_format_name(int format)
296 {
297         switch (format) {
298         case AFMT_MU_LAW:
299                 return "MU_LAW";
300         case AFMT_A_LAW:
301                 return "A_LAW";
302         case AFMT_IMA_ADPCM:
303                 return "IMA_ADPCM";
304         case AFMT_U8:
305                 return "U8";
306         case AFMT_S16_LE:
307                 return "S16_LE";
308         case AFMT_S16_BE:
309                 return "S16_BE";
310         case AFMT_S8:
311                 return "S8";
312         case AFMT_U16_LE:
313                 return "U16_LE";
314         case AFMT_U16_BE:
315                 return "U16_BE";
316         case AFMT_MPEG:
317                 return "MPEG";
318         default:
319                 return "unknown";
320         }
321 }
322 #endif
323
324 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
325                                    struct snd_info_buffer *buffer)
326 {
327         struct snd_pcm_info *info;
328         int err;
329
330         if (! substream)
331                 return;
332
333         info = kmalloc(sizeof(*info), GFP_KERNEL);
334         if (! info) {
335                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
336                 return;
337         }
338
339         err = snd_pcm_info(substream, info);
340         if (err < 0) {
341                 snd_iprintf(buffer, "error %d\n", err);
342                 kfree(info);
343                 return;
344         }
345         snd_iprintf(buffer, "card: %d\n", info->card);
346         snd_iprintf(buffer, "device: %d\n", info->device);
347         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
348         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
349         snd_iprintf(buffer, "id: %s\n", info->id);
350         snd_iprintf(buffer, "name: %s\n", info->name);
351         snd_iprintf(buffer, "subname: %s\n", info->subname);
352         snd_iprintf(buffer, "class: %d\n", info->dev_class);
353         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
354         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
355         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
356         kfree(info);
357 }
358
359 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
360                                           struct snd_info_buffer *buffer)
361 {
362         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
363                                buffer);
364 }
365
366 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
367                                              struct snd_info_buffer *buffer)
368 {
369         snd_pcm_proc_info_read(entry->private_data, buffer);
370 }
371
372 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
373                                                   struct snd_info_buffer *buffer)
374 {
375         struct snd_pcm_substream *substream = entry->private_data;
376         struct snd_pcm_runtime *runtime;
377
378         mutex_lock(&substream->pcm->open_mutex);
379         runtime = substream->runtime;
380         if (!runtime) {
381                 snd_iprintf(buffer, "closed\n");
382                 goto unlock;
383         }
384         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
385                 snd_iprintf(buffer, "no setup\n");
386                 goto unlock;
387         }
388         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
389         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
390         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
391         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
392         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
393         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
394         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
395 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
396         if (substream->oss.oss) {
397                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
398                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
399                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
400                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
401                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
402                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
403         }
404 #endif
405  unlock:
406         mutex_unlock(&substream->pcm->open_mutex);
407 }
408
409 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
410                                                   struct snd_info_buffer *buffer)
411 {
412         struct snd_pcm_substream *substream = entry->private_data;
413         struct snd_pcm_runtime *runtime;
414
415         mutex_lock(&substream->pcm->open_mutex);
416         runtime = substream->runtime;
417         if (!runtime) {
418                 snd_iprintf(buffer, "closed\n");
419                 goto unlock;
420         }
421         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
422                 snd_iprintf(buffer, "no setup\n");
423                 goto unlock;
424         }
425         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
426         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
427         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
428         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
429         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
430         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
431         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
432         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
433  unlock:
434         mutex_unlock(&substream->pcm->open_mutex);
435 }
436
437 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
438                                                struct snd_info_buffer *buffer)
439 {
440         struct snd_pcm_substream *substream = entry->private_data;
441         struct snd_pcm_runtime *runtime;
442         struct snd_pcm_status status;
443         int err;
444
445         mutex_lock(&substream->pcm->open_mutex);
446         runtime = substream->runtime;
447         if (!runtime) {
448                 snd_iprintf(buffer, "closed\n");
449                 goto unlock;
450         }
451         memset(&status, 0, sizeof(status));
452         err = snd_pcm_status(substream, &status);
453         if (err < 0) {
454                 snd_iprintf(buffer, "error %d\n", err);
455                 goto unlock;
456         }
457         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
458         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
459         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
460                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
461         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
462                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
463         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
464         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
465         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
466         snd_iprintf(buffer, "-----\n");
467         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
468         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
469  unlock:
470         mutex_unlock(&substream->pcm->open_mutex);
471 }
472
473 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
474 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
475                                     struct snd_info_buffer *buffer)
476 {
477         struct snd_pcm_str *pstr = entry->private_data;
478         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
479 }
480
481 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
482                                      struct snd_info_buffer *buffer)
483 {
484         struct snd_pcm_str *pstr = entry->private_data;
485         char line[64];
486         if (!snd_info_get_line(buffer, line, sizeof(line)))
487                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
488 }
489 #endif
490
491 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
492 {
493         struct snd_pcm *pcm = pstr->pcm;
494         struct snd_info_entry *entry;
495         char name[16];
496
497         sprintf(name, "pcm%i%c", pcm->device, 
498                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
499         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
500                 return -ENOMEM;
501         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
502         if (snd_info_register(entry) < 0) {
503                 snd_info_free_entry(entry);
504                 return -ENOMEM;
505         }
506         pstr->proc_root = entry;
507
508         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
509                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
510                 if (snd_info_register(entry) < 0) {
511                         snd_info_free_entry(entry);
512                         entry = NULL;
513                 }
514         }
515         pstr->proc_info_entry = entry;
516
517 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
518         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
519                                                 pstr->proc_root)) != NULL) {
520                 entry->c.text.read = snd_pcm_xrun_debug_read;
521                 entry->c.text.write = snd_pcm_xrun_debug_write;
522                 entry->mode |= S_IWUSR;
523                 entry->private_data = pstr;
524                 if (snd_info_register(entry) < 0) {
525                         snd_info_free_entry(entry);
526                         entry = NULL;
527                 }
528         }
529         pstr->proc_xrun_debug_entry = entry;
530 #endif
531         return 0;
532 }
533
534 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
535 {
536 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
537         snd_info_free_entry(pstr->proc_xrun_debug_entry);
538         pstr->proc_xrun_debug_entry = NULL;
539 #endif
540         snd_info_free_entry(pstr->proc_info_entry);
541         pstr->proc_info_entry = NULL;
542         snd_info_free_entry(pstr->proc_root);
543         pstr->proc_root = NULL;
544         return 0;
545 }
546
547 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
548 {
549         struct snd_info_entry *entry;
550         struct snd_card *card;
551         char name[16];
552
553         card = substream->pcm->card;
554
555         sprintf(name, "sub%i", substream->number);
556         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
557                 return -ENOMEM;
558         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
559         if (snd_info_register(entry) < 0) {
560                 snd_info_free_entry(entry);
561                 return -ENOMEM;
562         }
563         substream->proc_root = entry;
564
565         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
566                 snd_info_set_text_ops(entry, substream,
567                                       snd_pcm_substream_proc_info_read);
568                 if (snd_info_register(entry) < 0) {
569                         snd_info_free_entry(entry);
570                         entry = NULL;
571                 }
572         }
573         substream->proc_info_entry = entry;
574
575         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
576                 snd_info_set_text_ops(entry, substream,
577                                       snd_pcm_substream_proc_hw_params_read);
578                 if (snd_info_register(entry) < 0) {
579                         snd_info_free_entry(entry);
580                         entry = NULL;
581                 }
582         }
583         substream->proc_hw_params_entry = entry;
584
585         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
586                 snd_info_set_text_ops(entry, substream,
587                                       snd_pcm_substream_proc_sw_params_read);
588                 if (snd_info_register(entry) < 0) {
589                         snd_info_free_entry(entry);
590                         entry = NULL;
591                 }
592         }
593         substream->proc_sw_params_entry = entry;
594
595         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
596                 snd_info_set_text_ops(entry, substream,
597                                       snd_pcm_substream_proc_status_read);
598                 if (snd_info_register(entry) < 0) {
599                         snd_info_free_entry(entry);
600                         entry = NULL;
601                 }
602         }
603         substream->proc_status_entry = entry;
604
605         return 0;
606 }
607
608 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
609 {
610         snd_info_free_entry(substream->proc_info_entry);
611         substream->proc_info_entry = NULL;
612         snd_info_free_entry(substream->proc_hw_params_entry);
613         substream->proc_hw_params_entry = NULL;
614         snd_info_free_entry(substream->proc_sw_params_entry);
615         substream->proc_sw_params_entry = NULL;
616         snd_info_free_entry(substream->proc_status_entry);
617         substream->proc_status_entry = NULL;
618         snd_info_free_entry(substream->proc_root);
619         substream->proc_root = NULL;
620         return 0;
621 }
622 #else /* !CONFIG_SND_VERBOSE_PROCFS */
623 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
624 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
625 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
626 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
627 #endif /* CONFIG_SND_VERBOSE_PROCFS */
628
629 /**
630  * snd_pcm_new_stream - create a new PCM stream
631  * @pcm: the pcm instance
632  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
633  * @substream_count: the number of substreams
634  *
635  * Creates a new stream for the pcm.
636  * The corresponding stream on the pcm must have been empty before
637  * calling this, i.e. zero must be given to the argument of
638  * snd_pcm_new().
639  *
640  * Returns zero if successful, or a negative error code on failure.
641  */
642 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
643 {
644         int idx, err;
645         struct snd_pcm_str *pstr = &pcm->streams[stream];
646         struct snd_pcm_substream *substream, *prev;
647
648 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
649         mutex_init(&pstr->oss.setup_mutex);
650 #endif
651         pstr->stream = stream;
652         pstr->pcm = pcm;
653         pstr->substream_count = substream_count;
654         if (substream_count > 0 && !pcm->internal) {
655                 err = snd_pcm_stream_proc_init(pstr);
656                 if (err < 0) {
657                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
658                         return err;
659                 }
660         }
661         prev = NULL;
662         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
663                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
664                 if (substream == NULL) {
665                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
666                         return -ENOMEM;
667                 }
668                 substream->pcm = pcm;
669                 substream->pstr = pstr;
670                 substream->number = idx;
671                 substream->stream = stream;
672                 sprintf(substream->name, "subdevice #%i", idx);
673                 substream->buffer_bytes_max = UINT_MAX;
674                 if (prev == NULL)
675                         pstr->substream = substream;
676                 else
677                         prev->next = substream;
678
679                 if (!pcm->internal) {
680                         err = snd_pcm_substream_proc_init(substream);
681                         if (err < 0) {
682                                 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
683                                 if (prev == NULL)
684                                         pstr->substream = NULL;
685                                 else
686                                         prev->next = NULL;
687                                 kfree(substream);
688                                 return err;
689                         }
690                 }
691                 substream->group = &substream->self_group;
692                 spin_lock_init(&substream->self_group.lock);
693                 INIT_LIST_HEAD(&substream->self_group.substreams);
694                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
695                 atomic_set(&substream->mmap_count, 0);
696                 prev = substream;
697         }
698         return 0;
699 }                               
700
701 EXPORT_SYMBOL(snd_pcm_new_stream);
702
703 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
704                 int playback_count, int capture_count, bool internal,
705                 struct snd_pcm **rpcm)
706 {
707         struct snd_pcm *pcm;
708         int err;
709         static struct snd_device_ops ops = {
710                 .dev_free = snd_pcm_dev_free,
711                 .dev_register = snd_pcm_dev_register,
712                 .dev_disconnect = snd_pcm_dev_disconnect,
713         };
714
715         if (snd_BUG_ON(!card))
716                 return -ENXIO;
717         if (rpcm)
718                 *rpcm = NULL;
719         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
720         if (pcm == NULL) {
721                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
722                 return -ENOMEM;
723         }
724         pcm->card = card;
725         pcm->device = device;
726         pcm->internal = internal;
727         if (id)
728                 strlcpy(pcm->id, id, sizeof(pcm->id));
729         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
730                 snd_pcm_free(pcm);
731                 return err;
732         }
733         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
734                 snd_pcm_free(pcm);
735                 return err;
736         }
737         mutex_init(&pcm->open_mutex);
738         init_waitqueue_head(&pcm->open_wait);
739         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
740                 snd_pcm_free(pcm);
741                 return err;
742         }
743         if (rpcm)
744                 *rpcm = pcm;
745         return 0;
746 }
747
748 /**
749  * snd_pcm_new - create a new PCM instance
750  * @card: the card instance
751  * @id: the id string
752  * @device: the device index (zero based)
753  * @playback_count: the number of substreams for playback
754  * @capture_count: the number of substreams for capture
755  * @rpcm: the pointer to store the new pcm instance
756  *
757  * Creates a new PCM instance.
758  *
759  * The pcm operators have to be set afterwards to the new instance
760  * via snd_pcm_set_ops().
761  *
762  * Returns zero if successful, or a negative error code on failure.
763  */
764 int snd_pcm_new(struct snd_card *card, const char *id, int device,
765                 int playback_count, int capture_count, struct snd_pcm **rpcm)
766 {
767         return _snd_pcm_new(card, id, device, playback_count, capture_count,
768                         false, rpcm);
769 }
770 EXPORT_SYMBOL(snd_pcm_new);
771
772 /**
773  * snd_pcm_new_internal - create a new internal PCM instance
774  * @card: the card instance
775  * @id: the id string
776  * @device: the device index (zero based - shared with normal PCMs)
777  * @playback_count: the number of substreams for playback
778  * @capture_count: the number of substreams for capture
779  * @rpcm: the pointer to store the new pcm instance
780  *
781  * Creates a new internal PCM instance with no userspace device or procfs
782  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
783  * will only be used internally by kernel drivers. i.e. it cannot be opened
784  * by userspace. It provides existing ASoC components drivers with a substream
785  * and access to any private data.
786  *
787  * The pcm operators have to be set afterwards to the new instance
788  * via snd_pcm_set_ops().
789  *
790  * Returns zero if successful, or a negative error code on failure.
791  */
792 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
793         int playback_count, int capture_count,
794         struct snd_pcm **rpcm)
795 {
796         return _snd_pcm_new(card, id, device, playback_count, capture_count,
797                         true, rpcm);
798 }
799 EXPORT_SYMBOL(snd_pcm_new_internal);
800
801 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
802 {
803         struct snd_pcm_substream *substream, *substream_next;
804 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
805         struct snd_pcm_oss_setup *setup, *setupn;
806 #endif
807         substream = pstr->substream;
808         while (substream) {
809                 substream_next = substream->next;
810                 snd_pcm_timer_done(substream);
811                 snd_pcm_substream_proc_done(substream);
812                 kfree(substream);
813                 substream = substream_next;
814         }
815         snd_pcm_stream_proc_done(pstr);
816 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
817         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
818                 setupn = setup->next;
819                 kfree(setup->task_name);
820                 kfree(setup);
821         }
822 #endif
823 }
824
825 static int snd_pcm_free(struct snd_pcm *pcm)
826 {
827         struct snd_pcm_notify *notify;
828
829         if (!pcm)
830                 return 0;
831         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
832                 notify->n_unregister(pcm);
833         }
834         if (pcm->private_free)
835                 pcm->private_free(pcm);
836         snd_pcm_lib_preallocate_free_for_all(pcm);
837         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
838         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
839         kfree(pcm);
840         return 0;
841 }
842
843 static int snd_pcm_dev_free(struct snd_device *device)
844 {
845         struct snd_pcm *pcm = device->device_data;
846         return snd_pcm_free(pcm);
847 }
848
849 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
850                              struct file *file,
851                              struct snd_pcm_substream **rsubstream)
852 {
853         struct snd_pcm_str * pstr;
854         struct snd_pcm_substream *substream;
855         struct snd_pcm_runtime *runtime;
856         struct snd_ctl_file *kctl;
857         struct snd_card *card;
858         int prefer_subdevice = -1;
859         size_t size;
860
861         if (snd_BUG_ON(!pcm || !rsubstream))
862                 return -ENXIO;
863         *rsubstream = NULL;
864         pstr = &pcm->streams[stream];
865         if (pstr->substream == NULL || pstr->substream_count == 0)
866                 return -ENODEV;
867
868         card = pcm->card;
869         read_lock(&card->ctl_files_rwlock);
870         list_for_each_entry(kctl, &card->ctl_files, list) {
871                 if (kctl->pid == task_pid(current)) {
872                         prefer_subdevice = kctl->prefer_pcm_subdevice;
873                         if (prefer_subdevice != -1)
874                                 break;
875                 }
876         }
877         read_unlock(&card->ctl_files_rwlock);
878
879         switch (stream) {
880         case SNDRV_PCM_STREAM_PLAYBACK:
881                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
882                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
883                                 if (SUBSTREAM_BUSY(substream))
884                                         return -EAGAIN;
885                         }
886                 }
887                 break;
888         case SNDRV_PCM_STREAM_CAPTURE:
889                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
890                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
891                                 if (SUBSTREAM_BUSY(substream))
892                                         return -EAGAIN;
893                         }
894                 }
895                 break;
896         default:
897                 return -EINVAL;
898         }
899
900         if (file->f_flags & O_APPEND) {
901                 if (prefer_subdevice < 0) {
902                         if (pstr->substream_count > 1)
903                                 return -EINVAL; /* must be unique */
904                         substream = pstr->substream;
905                 } else {
906                         for (substream = pstr->substream; substream;
907                              substream = substream->next)
908                                 if (substream->number == prefer_subdevice)
909                                         break;
910                 }
911                 if (! substream)
912                         return -ENODEV;
913                 if (! SUBSTREAM_BUSY(substream))
914                         return -EBADFD;
915                 substream->ref_count++;
916                 *rsubstream = substream;
917                 return 0;
918         }
919
920         if (prefer_subdevice >= 0) {
921                 for (substream = pstr->substream; substream; substream = substream->next)
922                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
923                                 goto __ok;
924         }
925         for (substream = pstr->substream; substream; substream = substream->next)
926                 if (!SUBSTREAM_BUSY(substream))
927                         break;
928       __ok:
929         if (substream == NULL)
930                 return -EAGAIN;
931
932         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
933         if (runtime == NULL)
934                 return -ENOMEM;
935
936         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
937         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
938         if (runtime->status == NULL) {
939                 kfree(runtime);
940                 return -ENOMEM;
941         }
942         memset((void*)runtime->status, 0, size);
943
944         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
945         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
946         if (runtime->control == NULL) {
947                 snd_free_pages((void*)runtime->status,
948                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
949                 kfree(runtime);
950                 return -ENOMEM;
951         }
952         memset((void*)runtime->control, 0, size);
953
954         init_waitqueue_head(&runtime->sleep);
955         init_waitqueue_head(&runtime->tsleep);
956
957         runtime->status->state = SNDRV_PCM_STATE_OPEN;
958
959         substream->runtime = runtime;
960         substream->private_data = pcm->private_data;
961         substream->ref_count = 1;
962         substream->f_flags = file->f_flags;
963         substream->pid = get_pid(task_pid(current));
964         pstr->substream_opened++;
965         *rsubstream = substream;
966         return 0;
967 }
968
969 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
970 {
971         struct snd_pcm_runtime *runtime;
972
973         if (PCM_RUNTIME_CHECK(substream))
974                 return;
975         runtime = substream->runtime;
976         if (runtime->private_free != NULL)
977                 runtime->private_free(runtime);
978         snd_free_pages((void*)runtime->status,
979                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
980         snd_free_pages((void*)runtime->control,
981                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
982         kfree(runtime->hw_constraints.rules);
983 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
984         if (runtime->hwptr_log)
985                 kfree(runtime->hwptr_log);
986 #endif
987         kfree(runtime);
988         substream->runtime = NULL;
989         put_pid(substream->pid);
990         substream->pid = NULL;
991         substream->pstr->substream_opened--;
992 }
993
994 static ssize_t show_pcm_class(struct device *dev,
995                               struct device_attribute *attr, char *buf)
996 {
997         struct snd_pcm *pcm;
998         const char *str;
999         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1000                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1001                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1002                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1003                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1004         };
1005
1006         if (! (pcm = dev_get_drvdata(dev)) ||
1007             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1008                 str = "none";
1009         else
1010                 str = strs[pcm->dev_class];
1011         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1012 }
1013
1014 static struct device_attribute pcm_attrs =
1015         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1016
1017 static int snd_pcm_dev_register(struct snd_device *device)
1018 {
1019         int cidx, err;
1020         struct snd_pcm_substream *substream;
1021         struct snd_pcm_notify *notify;
1022         char str[16];
1023         struct snd_pcm *pcm;
1024         struct device *dev;
1025
1026         if (snd_BUG_ON(!device || !device->device_data))
1027                 return -ENXIO;
1028         pcm = device->device_data;
1029         mutex_lock(&register_mutex);
1030         err = snd_pcm_add(pcm);
1031         if (err) {
1032                 mutex_unlock(&register_mutex);
1033                 return err;
1034         }
1035         for (cidx = 0; cidx < 2; cidx++) {
1036                 int devtype = -1;
1037                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1038                         continue;
1039                 switch (cidx) {
1040                 case SNDRV_PCM_STREAM_PLAYBACK:
1041                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1042                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1043                         break;
1044                 case SNDRV_PCM_STREAM_CAPTURE:
1045                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1046                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1047                         break;
1048                 }
1049                 /* device pointer to use, pcm->dev takes precedence if
1050                  * it is assigned, otherwise fall back to card's device
1051                  * if possible */
1052                 dev = pcm->dev;
1053                 if (!dev)
1054                         dev = snd_card_get_device_link(pcm->card);
1055                 /* register pcm */
1056                 err = snd_register_device_for_dev(devtype, pcm->card,
1057                                                   pcm->device,
1058                                                   &snd_pcm_f_ops[cidx],
1059                                                   pcm, str, dev);
1060                 if (err < 0) {
1061                         list_del(&pcm->list);
1062                         mutex_unlock(&register_mutex);
1063                         return err;
1064                 }
1065                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1066                                           &pcm_attrs);
1067                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1068                         snd_pcm_timer_init(substream);
1069         }
1070
1071         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1072                 notify->n_register(pcm);
1073
1074         mutex_unlock(&register_mutex);
1075         return 0;
1076 }
1077
1078 static int snd_pcm_dev_disconnect(struct snd_device *device)
1079 {
1080         struct snd_pcm *pcm = device->device_data;
1081         struct snd_pcm_notify *notify;
1082         struct snd_pcm_substream *substream;
1083         int cidx, devtype;
1084
1085         mutex_lock(&register_mutex);
1086         if (list_empty(&pcm->list))
1087                 goto unlock;
1088
1089         list_del_init(&pcm->list);
1090         for (cidx = 0; cidx < 2; cidx++)
1091                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1092                         if (substream->runtime)
1093                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1094         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1095                 notify->n_disconnect(pcm);
1096         }
1097         for (cidx = 0; cidx < 2; cidx++) {
1098                 devtype = -1;
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                 snd_unregister_device(devtype, pcm->card, pcm->device);
1108         }
1109  unlock:
1110         mutex_unlock(&register_mutex);
1111         return 0;
1112 }
1113
1114 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1115 {
1116         struct snd_pcm *pcm;
1117
1118         if (snd_BUG_ON(!notify ||
1119                        !notify->n_register ||
1120                        !notify->n_unregister ||
1121                        !notify->n_disconnect))
1122                 return -EINVAL;
1123         mutex_lock(&register_mutex);
1124         if (nfree) {
1125                 list_del(&notify->list);
1126                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1127                         notify->n_unregister(pcm);
1128         } else {
1129                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1130                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1131                         notify->n_register(pcm);
1132         }
1133         mutex_unlock(&register_mutex);
1134         return 0;
1135 }
1136
1137 EXPORT_SYMBOL(snd_pcm_notify);
1138
1139 #ifdef CONFIG_PROC_FS
1140 /*
1141  *  Info interface
1142  */
1143
1144 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1145                               struct snd_info_buffer *buffer)
1146 {
1147         struct snd_pcm *pcm;
1148
1149         mutex_lock(&register_mutex);
1150         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1151                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1152                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1153                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1154                         snd_iprintf(buffer, " : playback %i",
1155                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1156                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1157                         snd_iprintf(buffer, " : capture %i",
1158                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1159                 snd_iprintf(buffer, "\n");
1160         }
1161         mutex_unlock(&register_mutex);
1162 }
1163
1164 static struct snd_info_entry *snd_pcm_proc_entry;
1165
1166 static void snd_pcm_proc_init(void)
1167 {
1168         struct snd_info_entry *entry;
1169
1170         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1171                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1172                 if (snd_info_register(entry) < 0) {
1173                         snd_info_free_entry(entry);
1174                         entry = NULL;
1175                 }
1176         }
1177         snd_pcm_proc_entry = entry;
1178 }
1179
1180 static void snd_pcm_proc_done(void)
1181 {
1182         snd_info_free_entry(snd_pcm_proc_entry);
1183 }
1184
1185 #else /* !CONFIG_PROC_FS */
1186 #define snd_pcm_proc_init()
1187 #define snd_pcm_proc_done()
1188 #endif /* CONFIG_PROC_FS */
1189
1190
1191 /*
1192  *  ENTRY functions
1193  */
1194
1195 static int __init alsa_pcm_init(void)
1196 {
1197         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1198         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1199         snd_pcm_proc_init();
1200         return 0;
1201 }
1202
1203 static void __exit alsa_pcm_exit(void)
1204 {
1205         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1206         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1207         snd_pcm_proc_done();
1208 }
1209
1210 module_init(alsa_pcm_init)
1211 module_exit(alsa_pcm_exit)