6e4bfcc14254cda1c38eb294b9cfce564de76ada
[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 <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/pcm.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32
33 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
35 MODULE_LICENSE("GPL");
36
37 static LIST_HEAD(snd_pcm_devices);
38 static LIST_HEAD(snd_pcm_notify_list);
39 static DEFINE_MUTEX(register_mutex);
40
41 static int snd_pcm_free(struct snd_pcm *pcm);
42 static int snd_pcm_dev_free(struct snd_device *device);
43 static int snd_pcm_dev_register(struct snd_device *device);
44 static int snd_pcm_dev_disconnect(struct snd_device *device);
45
46 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
47 {
48         struct snd_pcm *pcm;
49
50         list_for_each_entry(pcm, &snd_pcm_devices, list) {
51                 if (pcm->card == card && pcm->device == device)
52                         return pcm;
53         }
54         return NULL;
55 }
56
57 static int snd_pcm_next(struct snd_card *card, int device)
58 {
59         struct snd_pcm *pcm;
60
61         list_for_each_entry(pcm, &snd_pcm_devices, list) {
62                 if (pcm->card == card && pcm->device > device)
63                         return pcm->device;
64                 else if (pcm->card->number > card->number)
65                         return -1;
66         }
67         return -1;
68 }
69
70 static int snd_pcm_add(struct snd_pcm *newpcm)
71 {
72         struct snd_pcm *pcm;
73
74         list_for_each_entry(pcm, &snd_pcm_devices, list) {
75                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
76                         return -EBUSY;
77                 if (pcm->card->number > newpcm->card->number ||
78                                 (pcm->card == newpcm->card &&
79                                 pcm->device > newpcm->device)) {
80                         list_add(&newpcm->list, pcm->list.prev);
81                         return 0;
82                 }
83         }
84         list_add_tail(&newpcm->list, &snd_pcm_devices);
85         return 0;
86 }
87
88 static int snd_pcm_control_ioctl(struct snd_card *card,
89                                  struct snd_ctl_file *control,
90                                  unsigned int cmd, unsigned long arg)
91 {
92         switch (cmd) {
93         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
94                 {
95                         int device;
96
97                         if (get_user(device, (int __user *)arg))
98                                 return -EFAULT;
99                         mutex_lock(&register_mutex);
100                         device = snd_pcm_next(card, device);
101                         mutex_unlock(&register_mutex);
102                         if (put_user(device, (int __user *)arg))
103                                 return -EFAULT;
104                         return 0;
105                 }
106         case SNDRV_CTL_IOCTL_PCM_INFO:
107                 {
108                         struct snd_pcm_info __user *info;
109                         unsigned int device, subdevice;
110                         int stream;
111                         struct snd_pcm *pcm;
112                         struct snd_pcm_str *pstr;
113                         struct snd_pcm_substream *substream;
114                         int err;
115
116                         info = (struct snd_pcm_info __user *)arg;
117                         if (get_user(device, &info->device))
118                                 return -EFAULT;
119                         if (get_user(stream, &info->stream))
120                                 return -EFAULT;
121                         if (stream < 0 || stream > 1)
122                                 return -EINVAL;
123                         if (get_user(subdevice, &info->subdevice))
124                                 return -EFAULT;
125                         mutex_lock(&register_mutex);
126                         pcm = snd_pcm_get(card, device);
127                         if (pcm == NULL) {
128                                 err = -ENXIO;
129                                 goto _error;
130                         }
131                         pstr = &pcm->streams[stream];
132                         if (pstr->substream_count == 0) {
133                                 err = -ENOENT;
134                                 goto _error;
135                         }
136                         if (subdevice >= pstr->substream_count) {
137                                 err = -ENXIO;
138                                 goto _error;
139                         }
140                         for (substream = pstr->substream; substream;
141                              substream = substream->next)
142                                 if (substream->number == (int)subdevice)
143                                         break;
144                         if (substream == NULL) {
145                                 err = -ENXIO;
146                                 goto _error;
147                         }
148                         err = snd_pcm_info_user(substream, info);
149                 _error:
150                         mutex_unlock(&register_mutex);
151                         return err;
152                 }
153         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
154                 {
155                         int val;
156                         
157                         if (get_user(val, (int __user *)arg))
158                                 return -EFAULT;
159                         control->prefer_pcm_subdevice = val;
160                         return 0;
161                 }
162         }
163         return -ENOIOCTLCMD;
164 }
165
166 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
167
168 static char *snd_pcm_format_names[] = {
169         FORMAT(S8),
170         FORMAT(U8),
171         FORMAT(S16_LE),
172         FORMAT(S16_BE),
173         FORMAT(U16_LE),
174         FORMAT(U16_BE),
175         FORMAT(S24_LE),
176         FORMAT(S24_BE),
177         FORMAT(U24_LE),
178         FORMAT(U24_BE),
179         FORMAT(S32_LE),
180         FORMAT(S32_BE),
181         FORMAT(U32_LE),
182         FORMAT(U32_BE),
183         FORMAT(FLOAT_LE),
184         FORMAT(FLOAT_BE),
185         FORMAT(FLOAT64_LE),
186         FORMAT(FLOAT64_BE),
187         FORMAT(IEC958_SUBFRAME_LE),
188         FORMAT(IEC958_SUBFRAME_BE),
189         FORMAT(MU_LAW),
190         FORMAT(A_LAW),
191         FORMAT(IMA_ADPCM),
192         FORMAT(MPEG),
193         FORMAT(GSM),
194         FORMAT(SPECIAL),
195         FORMAT(S24_3LE),
196         FORMAT(S24_3BE),
197         FORMAT(U24_3LE),
198         FORMAT(U24_3BE),
199         FORMAT(S20_3LE),
200         FORMAT(S20_3BE),
201         FORMAT(U20_3LE),
202         FORMAT(U20_3BE),
203         FORMAT(S18_3LE),
204         FORMAT(S18_3BE),
205         FORMAT(U18_3LE),
206         FORMAT(U18_3BE),
207         FORMAT(G723_24),
208         FORMAT(G723_24_1B),
209         FORMAT(G723_40),
210         FORMAT(G723_40_1B),
211 };
212
213 const char *snd_pcm_format_name(snd_pcm_format_t format)
214 {
215         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
216                 return "Unknown";
217         return snd_pcm_format_names[(__force unsigned int)format];
218 }
219 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
220
221 #ifdef CONFIG_SND_VERBOSE_PROCFS
222
223 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
224 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
225 #define READY(v) [SNDRV_PCM_READY_##v] = #v
226 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
227 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
228 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
229 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
230 #define START(v) [SNDRV_PCM_START_##v] = #v
231 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
232
233 static char *snd_pcm_stream_names[] = {
234         STREAM(PLAYBACK),
235         STREAM(CAPTURE),
236 };
237
238 static char *snd_pcm_state_names[] = {
239         STATE(OPEN),
240         STATE(SETUP),
241         STATE(PREPARED),
242         STATE(RUNNING),
243         STATE(XRUN),
244         STATE(DRAINING),
245         STATE(PAUSED),
246         STATE(SUSPENDED),
247 };
248
249 static char *snd_pcm_access_names[] = {
250         ACCESS(MMAP_INTERLEAVED), 
251         ACCESS(MMAP_NONINTERLEAVED),
252         ACCESS(MMAP_COMPLEX),
253         ACCESS(RW_INTERLEAVED),
254         ACCESS(RW_NONINTERLEAVED),
255 };
256
257 static char *snd_pcm_subformat_names[] = {
258         SUBFORMAT(STD), 
259 };
260
261 static char *snd_pcm_tstamp_mode_names[] = {
262         TSTAMP(NONE),
263         TSTAMP(ENABLE),
264 };
265
266 static const char *snd_pcm_stream_name(int stream)
267 {
268         return snd_pcm_stream_names[stream];
269 }
270
271 static const char *snd_pcm_access_name(snd_pcm_access_t access)
272 {
273         return snd_pcm_access_names[(__force int)access];
274 }
275
276 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
277 {
278         return snd_pcm_subformat_names[(__force int)subformat];
279 }
280
281 static const char *snd_pcm_tstamp_mode_name(int mode)
282 {
283         return snd_pcm_tstamp_mode_names[mode];
284 }
285
286 static const char *snd_pcm_state_name(snd_pcm_state_t state)
287 {
288         return snd_pcm_state_names[(__force int)state];
289 }
290
291 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
292 #include <linux/soundcard.h>
293
294 static const char *snd_pcm_oss_format_name(int format)
295 {
296         switch (format) {
297         case AFMT_MU_LAW:
298                 return "MU_LAW";
299         case AFMT_A_LAW:
300                 return "A_LAW";
301         case AFMT_IMA_ADPCM:
302                 return "IMA_ADPCM";
303         case AFMT_U8:
304                 return "U8";
305         case AFMT_S16_LE:
306                 return "S16_LE";
307         case AFMT_S16_BE:
308                 return "S16_BE";
309         case AFMT_S8:
310                 return "S8";
311         case AFMT_U16_LE:
312                 return "U16_LE";
313         case AFMT_U16_BE:
314                 return "U16_BE";
315         case AFMT_MPEG:
316                 return "MPEG";
317         default:
318                 return "unknown";
319         }
320 }
321 #endif
322
323 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
324                                    struct snd_info_buffer *buffer)
325 {
326         struct snd_pcm_info *info;
327         int err;
328
329         if (! substream)
330                 return;
331
332         info = kmalloc(sizeof(*info), GFP_KERNEL);
333         if (! info) {
334                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
335                 return;
336         }
337
338         err = snd_pcm_info(substream, info);
339         if (err < 0) {
340                 snd_iprintf(buffer, "error %d\n", err);
341                 kfree(info);
342                 return;
343         }
344         snd_iprintf(buffer, "card: %d\n", info->card);
345         snd_iprintf(buffer, "device: %d\n", info->device);
346         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
347         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
348         snd_iprintf(buffer, "id: %s\n", info->id);
349         snd_iprintf(buffer, "name: %s\n", info->name);
350         snd_iprintf(buffer, "subname: %s\n", info->subname);
351         snd_iprintf(buffer, "class: %d\n", info->dev_class);
352         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
353         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
354         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
355         kfree(info);
356 }
357
358 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
359                                           struct snd_info_buffer *buffer)
360 {
361         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
362                                buffer);
363 }
364
365 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
366                                              struct snd_info_buffer *buffer)
367 {
368         snd_pcm_proc_info_read(entry->private_data, buffer);
369 }
370
371 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
372                                                   struct snd_info_buffer *buffer)
373 {
374         struct snd_pcm_substream *substream = entry->private_data;
375         struct snd_pcm_runtime *runtime;
376
377         mutex_lock(&substream->pcm->open_mutex);
378         runtime = substream->runtime;
379         if (!runtime) {
380                 snd_iprintf(buffer, "closed\n");
381                 goto unlock;
382         }
383         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
384                 snd_iprintf(buffer, "no setup\n");
385                 goto unlock;
386         }
387         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
388         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
389         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
390         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
391         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
392         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
393         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
395         if (substream->oss.oss) {
396                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
397                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
398                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
399                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
400                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
401                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
402         }
403 #endif
404  unlock:
405         mutex_unlock(&substream->pcm->open_mutex);
406 }
407
408 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
409                                                   struct snd_info_buffer *buffer)
410 {
411         struct snd_pcm_substream *substream = entry->private_data;
412         struct snd_pcm_runtime *runtime;
413
414         mutex_lock(&substream->pcm->open_mutex);
415         runtime = substream->runtime;
416         if (!runtime) {
417                 snd_iprintf(buffer, "closed\n");
418                 goto unlock;
419         }
420         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
421                 snd_iprintf(buffer, "no setup\n");
422                 goto unlock;
423         }
424         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
425         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
426         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
427         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
428         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
429         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
430         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
431         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
432  unlock:
433         mutex_unlock(&substream->pcm->open_mutex);
434 }
435
436 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
437                                                struct snd_info_buffer *buffer)
438 {
439         struct snd_pcm_substream *substream = entry->private_data;
440         struct snd_pcm_runtime *runtime;
441         struct snd_pcm_status status;
442         int err;
443
444         mutex_lock(&substream->pcm->open_mutex);
445         runtime = substream->runtime;
446         if (!runtime) {
447                 snd_iprintf(buffer, "closed\n");
448                 goto unlock;
449         }
450         memset(&status, 0, sizeof(status));
451         err = snd_pcm_status(substream, &status);
452         if (err < 0) {
453                 snd_iprintf(buffer, "error %d\n", err);
454                 goto unlock;
455         }
456         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
457         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
458         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
459                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
460         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
461                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
462         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
463         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
464         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
465         snd_iprintf(buffer, "-----\n");
466         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
467         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
468  unlock:
469         mutex_unlock(&substream->pcm->open_mutex);
470 }
471
472 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
473 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
474                                     struct snd_info_buffer *buffer)
475 {
476         struct snd_pcm_str *pstr = entry->private_data;
477         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
478 }
479
480 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
481                                      struct snd_info_buffer *buffer)
482 {
483         struct snd_pcm_str *pstr = entry->private_data;
484         char line[64];
485         if (!snd_info_get_line(buffer, line, sizeof(line)))
486                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
487 }
488 #endif
489
490 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
491 {
492         struct snd_pcm *pcm = pstr->pcm;
493         struct snd_info_entry *entry;
494         char name[16];
495
496         sprintf(name, "pcm%i%c", pcm->device, 
497                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
498         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
499                 return -ENOMEM;
500         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
501         if (snd_info_register(entry) < 0) {
502                 snd_info_free_entry(entry);
503                 return -ENOMEM;
504         }
505         pstr->proc_root = entry;
506
507         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
508                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
509                 if (snd_info_register(entry) < 0) {
510                         snd_info_free_entry(entry);
511                         entry = NULL;
512                 }
513         }
514         pstr->proc_info_entry = entry;
515
516 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
517         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
518                                                 pstr->proc_root)) != NULL) {
519                 entry->c.text.read = snd_pcm_xrun_debug_read;
520                 entry->c.text.write = snd_pcm_xrun_debug_write;
521                 entry->mode |= S_IWUSR;
522                 entry->private_data = pstr;
523                 if (snd_info_register(entry) < 0) {
524                         snd_info_free_entry(entry);
525                         entry = NULL;
526                 }
527         }
528         pstr->proc_xrun_debug_entry = entry;
529 #endif
530         return 0;
531 }
532
533 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
534 {
535 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
536         snd_info_free_entry(pstr->proc_xrun_debug_entry);
537         pstr->proc_xrun_debug_entry = NULL;
538 #endif
539         snd_info_free_entry(pstr->proc_info_entry);
540         pstr->proc_info_entry = NULL;
541         snd_info_free_entry(pstr->proc_root);
542         pstr->proc_root = NULL;
543         return 0;
544 }
545
546 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
547 {
548         struct snd_info_entry *entry;
549         struct snd_card *card;
550         char name[16];
551
552         card = substream->pcm->card;
553
554         sprintf(name, "sub%i", substream->number);
555         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
556                 return -ENOMEM;
557         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
558         if (snd_info_register(entry) < 0) {
559                 snd_info_free_entry(entry);
560                 return -ENOMEM;
561         }
562         substream->proc_root = entry;
563
564         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
565                 snd_info_set_text_ops(entry, substream,
566                                       snd_pcm_substream_proc_info_read);
567                 if (snd_info_register(entry) < 0) {
568                         snd_info_free_entry(entry);
569                         entry = NULL;
570                 }
571         }
572         substream->proc_info_entry = entry;
573
574         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
575                 snd_info_set_text_ops(entry, substream,
576                                       snd_pcm_substream_proc_hw_params_read);
577                 if (snd_info_register(entry) < 0) {
578                         snd_info_free_entry(entry);
579                         entry = NULL;
580                 }
581         }
582         substream->proc_hw_params_entry = entry;
583
584         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
585                 snd_info_set_text_ops(entry, substream,
586                                       snd_pcm_substream_proc_sw_params_read);
587                 if (snd_info_register(entry) < 0) {
588                         snd_info_free_entry(entry);
589                         entry = NULL;
590                 }
591         }
592         substream->proc_sw_params_entry = entry;
593
594         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
595                 snd_info_set_text_ops(entry, substream,
596                                       snd_pcm_substream_proc_status_read);
597                 if (snd_info_register(entry) < 0) {
598                         snd_info_free_entry(entry);
599                         entry = NULL;
600                 }
601         }
602         substream->proc_status_entry = entry;
603
604         return 0;
605 }
606
607 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
608 {
609         snd_info_free_entry(substream->proc_info_entry);
610         substream->proc_info_entry = NULL;
611         snd_info_free_entry(substream->proc_hw_params_entry);
612         substream->proc_hw_params_entry = NULL;
613         snd_info_free_entry(substream->proc_sw_params_entry);
614         substream->proc_sw_params_entry = NULL;
615         snd_info_free_entry(substream->proc_status_entry);
616         substream->proc_status_entry = NULL;
617         snd_info_free_entry(substream->proc_root);
618         substream->proc_root = NULL;
619         return 0;
620 }
621 #else /* !CONFIG_SND_VERBOSE_PROCFS */
622 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
623 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
624 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
625 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
626 #endif /* CONFIG_SND_VERBOSE_PROCFS */
627
628 /**
629  * snd_pcm_new_stream - create a new PCM stream
630  * @pcm: the pcm instance
631  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
632  * @substream_count: the number of substreams
633  *
634  * Creates a new stream for the pcm.
635  * The corresponding stream on the pcm must have been empty before
636  * calling this, i.e. zero must be given to the argument of
637  * snd_pcm_new().
638  *
639  * Returns zero if successful, or a negative error code on failure.
640  */
641 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
642 {
643         int idx, err;
644         struct snd_pcm_str *pstr = &pcm->streams[stream];
645         struct snd_pcm_substream *substream, *prev;
646
647 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
648         mutex_init(&pstr->oss.setup_mutex);
649 #endif
650         pstr->stream = stream;
651         pstr->pcm = pcm;
652         pstr->substream_count = substream_count;
653         if (substream_count > 0 && !pcm->internal) {
654                 err = snd_pcm_stream_proc_init(pstr);
655                 if (err < 0) {
656                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
657                         return err;
658                 }
659         }
660         prev = NULL;
661         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
662                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
663                 if (substream == NULL) {
664                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
665                         return -ENOMEM;
666                 }
667                 substream->pcm = pcm;
668                 substream->pstr = pstr;
669                 substream->number = idx;
670                 substream->stream = stream;
671                 sprintf(substream->name, "subdevice #%i", idx);
672                 substream->buffer_bytes_max = UINT_MAX;
673                 if (prev == NULL)
674                         pstr->substream = substream;
675                 else
676                         prev->next = substream;
677
678                 if (!pcm->internal) {
679                         err = snd_pcm_substream_proc_init(substream);
680                         if (err < 0) {
681                                 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
682                                 if (prev == NULL)
683                                         pstr->substream = NULL;
684                                 else
685                                         prev->next = NULL;
686                                 kfree(substream);
687                                 return err;
688                         }
689                 }
690                 substream->group = &substream->self_group;
691                 spin_lock_init(&substream->self_group.lock);
692                 INIT_LIST_HEAD(&substream->self_group.substreams);
693                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
694                 atomic_set(&substream->mmap_count, 0);
695                 prev = substream;
696         }
697         return 0;
698 }                               
699
700 EXPORT_SYMBOL(snd_pcm_new_stream);
701
702 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
703                 int playback_count, int capture_count, bool internal,
704                 struct snd_pcm **rpcm)
705 {
706         struct snd_pcm *pcm;
707         int err;
708         static struct snd_device_ops ops = {
709                 .dev_free = snd_pcm_dev_free,
710                 .dev_register = snd_pcm_dev_register,
711                 .dev_disconnect = snd_pcm_dev_disconnect,
712         };
713
714         if (snd_BUG_ON(!card))
715                 return -ENXIO;
716         if (rpcm)
717                 *rpcm = NULL;
718         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
719         if (pcm == NULL) {
720                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
721                 return -ENOMEM;
722         }
723         pcm->card = card;
724         pcm->device = device;
725         pcm->internal = internal;
726         if (id)
727                 strlcpy(pcm->id, id, sizeof(pcm->id));
728         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
729                 snd_pcm_free(pcm);
730                 return err;
731         }
732         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
733                 snd_pcm_free(pcm);
734                 return err;
735         }
736         mutex_init(&pcm->open_mutex);
737         init_waitqueue_head(&pcm->open_wait);
738         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
739                 snd_pcm_free(pcm);
740                 return err;
741         }
742         if (rpcm)
743                 *rpcm = pcm;
744         return 0;
745 }
746
747 /**
748  * snd_pcm_new - create a new PCM instance
749  * @card: the card instance
750  * @id: the id string
751  * @device: the device index (zero based)
752  * @playback_count: the number of substreams for playback
753  * @capture_count: the number of substreams for capture
754  * @rpcm: the pointer to store the new pcm instance
755  *
756  * Creates a new PCM instance.
757  *
758  * The pcm operators have to be set afterwards to the new instance
759  * via snd_pcm_set_ops().
760  *
761  * Returns zero if successful, or a negative error code on failure.
762  */
763 int snd_pcm_new(struct snd_card *card, const char *id, int device,
764                 int playback_count, int capture_count, struct snd_pcm **rpcm)
765 {
766         return _snd_pcm_new(card, id, device, playback_count, capture_count,
767                         false, rpcm);
768 }
769 EXPORT_SYMBOL(snd_pcm_new);
770
771 /**
772  * snd_pcm_new_internal - create a new internal PCM instance
773  * @card: the card instance
774  * @id: the id string
775  * @device: the device index (zero based - shared with normal PCMs)
776  * @playback_count: the number of substreams for playback
777  * @capture_count: the number of substreams for capture
778  * @rpcm: the pointer to store the new pcm instance
779  *
780  * Creates a new internal PCM instance with no userspace device or procfs
781  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
782  * will only be used internally by kernel drivers. i.e. it cannot be opened
783  * by userspace. It provides existing ASoC components drivers with a substream
784  * and access to any private data.
785  *
786  * The pcm operators have to be set afterwards to the new instance
787  * via snd_pcm_set_ops().
788  *
789  * Returns zero if successful, or a negative error code on failure.
790  */
791 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
792         int playback_count, int capture_count,
793         struct snd_pcm **rpcm)
794 {
795         return _snd_pcm_new(card, id, device, playback_count, capture_count,
796                         true, rpcm);
797 }
798 EXPORT_SYMBOL(snd_pcm_new_internal);
799
800 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
801 {
802         struct snd_pcm_substream *substream, *substream_next;
803 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
804         struct snd_pcm_oss_setup *setup, *setupn;
805 #endif
806         substream = pstr->substream;
807         while (substream) {
808                 substream_next = substream->next;
809                 snd_pcm_timer_done(substream);
810                 snd_pcm_substream_proc_done(substream);
811                 kfree(substream);
812                 substream = substream_next;
813         }
814         snd_pcm_stream_proc_done(pstr);
815 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
816         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
817                 setupn = setup->next;
818                 kfree(setup->task_name);
819                 kfree(setup);
820         }
821 #endif
822 }
823
824 static int snd_pcm_free(struct snd_pcm *pcm)
825 {
826         struct snd_pcm_notify *notify;
827
828         if (!pcm)
829                 return 0;
830         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
831                 notify->n_unregister(pcm);
832         }
833         if (pcm->private_free)
834                 pcm->private_free(pcm);
835         snd_pcm_lib_preallocate_free_for_all(pcm);
836         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
837         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
838         kfree(pcm);
839         return 0;
840 }
841
842 static int snd_pcm_dev_free(struct snd_device *device)
843 {
844         struct snd_pcm *pcm = device->device_data;
845         return snd_pcm_free(pcm);
846 }
847
848 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
849                              struct file *file,
850                              struct snd_pcm_substream **rsubstream)
851 {
852         struct snd_pcm_str * pstr;
853         struct snd_pcm_substream *substream;
854         struct snd_pcm_runtime *runtime;
855         struct snd_ctl_file *kctl;
856         struct snd_card *card;
857         int prefer_subdevice = -1;
858         size_t size;
859
860         if (snd_BUG_ON(!pcm || !rsubstream))
861                 return -ENXIO;
862         *rsubstream = NULL;
863         pstr = &pcm->streams[stream];
864         if (pstr->substream == NULL || pstr->substream_count == 0)
865                 return -ENODEV;
866
867         card = pcm->card;
868         read_lock(&card->ctl_files_rwlock);
869         list_for_each_entry(kctl, &card->ctl_files, list) {
870                 if (kctl->pid == task_pid(current)) {
871                         prefer_subdevice = kctl->prefer_pcm_subdevice;
872                         if (prefer_subdevice != -1)
873                                 break;
874                 }
875         }
876         read_unlock(&card->ctl_files_rwlock);
877
878         switch (stream) {
879         case SNDRV_PCM_STREAM_PLAYBACK:
880                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
881                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
882                                 if (SUBSTREAM_BUSY(substream))
883                                         return -EAGAIN;
884                         }
885                 }
886                 break;
887         case SNDRV_PCM_STREAM_CAPTURE:
888                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
889                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
890                                 if (SUBSTREAM_BUSY(substream))
891                                         return -EAGAIN;
892                         }
893                 }
894                 break;
895         default:
896                 return -EINVAL;
897         }
898
899         if (file->f_flags & O_APPEND) {
900                 if (prefer_subdevice < 0) {
901                         if (pstr->substream_count > 1)
902                                 return -EINVAL; /* must be unique */
903                         substream = pstr->substream;
904                 } else {
905                         for (substream = pstr->substream; substream;
906                              substream = substream->next)
907                                 if (substream->number == prefer_subdevice)
908                                         break;
909                 }
910                 if (! substream)
911                         return -ENODEV;
912                 if (! SUBSTREAM_BUSY(substream))
913                         return -EBADFD;
914                 substream->ref_count++;
915                 *rsubstream = substream;
916                 return 0;
917         }
918
919         if (prefer_subdevice >= 0) {
920                 for (substream = pstr->substream; substream; substream = substream->next)
921                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
922                                 goto __ok;
923         }
924         for (substream = pstr->substream; substream; substream = substream->next)
925                 if (!SUBSTREAM_BUSY(substream))
926                         break;
927       __ok:
928         if (substream == NULL)
929                 return -EAGAIN;
930
931         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
932         if (runtime == NULL)
933                 return -ENOMEM;
934
935         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
936         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
937         if (runtime->status == NULL) {
938                 kfree(runtime);
939                 return -ENOMEM;
940         }
941         memset((void*)runtime->status, 0, size);
942
943         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
944         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
945         if (runtime->control == NULL) {
946                 snd_free_pages((void*)runtime->status,
947                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
948                 kfree(runtime);
949                 return -ENOMEM;
950         }
951         memset((void*)runtime->control, 0, size);
952
953         init_waitqueue_head(&runtime->sleep);
954         init_waitqueue_head(&runtime->tsleep);
955
956         runtime->status->state = SNDRV_PCM_STATE_OPEN;
957
958         substream->runtime = runtime;
959         substream->private_data = pcm->private_data;
960         substream->ref_count = 1;
961         substream->f_flags = file->f_flags;
962         substream->pid = get_pid(task_pid(current));
963         pstr->substream_opened++;
964         *rsubstream = substream;
965         return 0;
966 }
967
968 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
969 {
970         struct snd_pcm_runtime *runtime;
971
972         if (PCM_RUNTIME_CHECK(substream))
973                 return;
974         runtime = substream->runtime;
975         if (runtime->private_free != NULL)
976                 runtime->private_free(runtime);
977         snd_free_pages((void*)runtime->status,
978                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
979         snd_free_pages((void*)runtime->control,
980                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
981         kfree(runtime->hw_constraints.rules);
982 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
983         if (runtime->hwptr_log)
984                 kfree(runtime->hwptr_log);
985 #endif
986         kfree(runtime);
987         substream->runtime = NULL;
988         put_pid(substream->pid);
989         substream->pid = NULL;
990         substream->pstr->substream_opened--;
991 }
992
993 static ssize_t show_pcm_class(struct device *dev,
994                               struct device_attribute *attr, char *buf)
995 {
996         struct snd_pcm *pcm;
997         const char *str;
998         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
999                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1000                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1001                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1002                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1003         };
1004
1005         if (! (pcm = dev_get_drvdata(dev)) ||
1006             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1007                 str = "none";
1008         else
1009                 str = strs[pcm->dev_class];
1010         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1011 }
1012
1013 static struct device_attribute pcm_attrs =
1014         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1015
1016 static int snd_pcm_dev_register(struct snd_device *device)
1017 {
1018         int cidx, err;
1019         struct snd_pcm_substream *substream;
1020         struct snd_pcm_notify *notify;
1021         char str[16];
1022         struct snd_pcm *pcm;
1023         struct device *dev;
1024
1025         if (snd_BUG_ON(!device || !device->device_data))
1026                 return -ENXIO;
1027         pcm = device->device_data;
1028         mutex_lock(&register_mutex);
1029         err = snd_pcm_add(pcm);
1030         if (err) {
1031                 mutex_unlock(&register_mutex);
1032                 return err;
1033         }
1034         for (cidx = 0; cidx < 2; cidx++) {
1035                 int devtype = -1;
1036                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1037                         continue;
1038                 switch (cidx) {
1039                 case SNDRV_PCM_STREAM_PLAYBACK:
1040                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1041                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1042                         break;
1043                 case SNDRV_PCM_STREAM_CAPTURE:
1044                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1045                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1046                         break;
1047                 }
1048                 /* device pointer to use, pcm->dev takes precedence if
1049                  * it is assigned, otherwise fall back to card's device
1050                  * if possible */
1051                 dev = pcm->dev;
1052                 if (!dev)
1053                         dev = snd_card_get_device_link(pcm->card);
1054                 /* register pcm */
1055                 err = snd_register_device_for_dev(devtype, pcm->card,
1056                                                   pcm->device,
1057                                                   &snd_pcm_f_ops[cidx],
1058                                                   pcm, str, dev);
1059                 if (err < 0) {
1060                         list_del(&pcm->list);
1061                         mutex_unlock(&register_mutex);
1062                         return err;
1063                 }
1064                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1065                                           &pcm_attrs);
1066                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1067                         snd_pcm_timer_init(substream);
1068         }
1069
1070         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1071                 notify->n_register(pcm);
1072
1073         mutex_unlock(&register_mutex);
1074         return 0;
1075 }
1076
1077 static int snd_pcm_dev_disconnect(struct snd_device *device)
1078 {
1079         struct snd_pcm *pcm = device->device_data;
1080         struct snd_pcm_notify *notify;
1081         struct snd_pcm_substream *substream;
1082         int cidx, devtype;
1083
1084         mutex_lock(&register_mutex);
1085         if (list_empty(&pcm->list))
1086                 goto unlock;
1087
1088         list_del_init(&pcm->list);
1089         for (cidx = 0; cidx < 2; cidx++)
1090                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1091                         if (substream->runtime)
1092                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1093         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1094                 notify->n_disconnect(pcm);
1095         }
1096         for (cidx = 0; cidx < 2; cidx++) {
1097                 devtype = -1;
1098                 switch (cidx) {
1099                 case SNDRV_PCM_STREAM_PLAYBACK:
1100                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1101                         break;
1102                 case SNDRV_PCM_STREAM_CAPTURE:
1103                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1104                         break;
1105                 }
1106                 snd_unregister_device(devtype, pcm->card, pcm->device);
1107         }
1108  unlock:
1109         mutex_unlock(&register_mutex);
1110         return 0;
1111 }
1112
1113 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1114 {
1115         struct snd_pcm *pcm;
1116
1117         if (snd_BUG_ON(!notify ||
1118                        !notify->n_register ||
1119                        !notify->n_unregister ||
1120                        !notify->n_disconnect))
1121                 return -EINVAL;
1122         mutex_lock(&register_mutex);
1123         if (nfree) {
1124                 list_del(&notify->list);
1125                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1126                         notify->n_unregister(pcm);
1127         } else {
1128                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1129                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1130                         notify->n_register(pcm);
1131         }
1132         mutex_unlock(&register_mutex);
1133         return 0;
1134 }
1135
1136 EXPORT_SYMBOL(snd_pcm_notify);
1137
1138 #ifdef CONFIG_PROC_FS
1139 /*
1140  *  Info interface
1141  */
1142
1143 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1144                               struct snd_info_buffer *buffer)
1145 {
1146         struct snd_pcm *pcm;
1147
1148         mutex_lock(&register_mutex);
1149         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1150                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1151                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1152                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1153                         snd_iprintf(buffer, " : playback %i",
1154                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1155                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1156                         snd_iprintf(buffer, " : capture %i",
1157                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1158                 snd_iprintf(buffer, "\n");
1159         }
1160         mutex_unlock(&register_mutex);
1161 }
1162
1163 static struct snd_info_entry *snd_pcm_proc_entry;
1164
1165 static void snd_pcm_proc_init(void)
1166 {
1167         struct snd_info_entry *entry;
1168
1169         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1170                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1171                 if (snd_info_register(entry) < 0) {
1172                         snd_info_free_entry(entry);
1173                         entry = NULL;
1174                 }
1175         }
1176         snd_pcm_proc_entry = entry;
1177 }
1178
1179 static void snd_pcm_proc_done(void)
1180 {
1181         snd_info_free_entry(snd_pcm_proc_entry);
1182 }
1183
1184 #else /* !CONFIG_PROC_FS */
1185 #define snd_pcm_proc_init()
1186 #define snd_pcm_proc_done()
1187 #endif /* CONFIG_PROC_FS */
1188
1189
1190 /*
1191  *  ENTRY functions
1192  */
1193
1194 static int __init alsa_pcm_init(void)
1195 {
1196         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1197         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1198         snd_pcm_proc_init();
1199         return 0;
1200 }
1201
1202 static void __exit alsa_pcm_exit(void)
1203 {
1204         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1205         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1206         snd_pcm_proc_done();
1207 }
1208
1209 module_init(alsa_pcm_init)
1210 module_exit(alsa_pcm_exit)