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[kernel/linux-2.6.36.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/time.h>
25 #include <linux/mutex.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/pcm.h>
29 #include <sound/control.h>
30 #include <sound/info.h>
31
32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
35
36 static LIST_HEAD(snd_pcm_devices);
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DEFINE_MUTEX(register_mutex);
39
40 static int snd_pcm_free(struct snd_pcm *pcm);
41 static int snd_pcm_dev_free(struct snd_device *device);
42 static int snd_pcm_dev_register(struct snd_device *device);
43 static int snd_pcm_dev_disconnect(struct snd_device *device);
44
45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
46 {
47         struct snd_pcm *pcm;
48
49         list_for_each_entry(pcm, &snd_pcm_devices, list) {
50                 if (pcm->card == card && pcm->device == device)
51                         return pcm;
52         }
53         return NULL;
54 }
55
56 static int snd_pcm_next(struct snd_card *card, int device)
57 {
58         struct snd_pcm *pcm;
59
60         list_for_each_entry(pcm, &snd_pcm_devices, list) {
61                 if (pcm->card == card && pcm->device > device)
62                         return pcm->device;
63                 else if (pcm->card->number > card->number)
64                         return -1;
65         }
66         return -1;
67 }
68
69 static int snd_pcm_add(struct snd_pcm *newpcm)
70 {
71         struct snd_pcm *pcm;
72
73         list_for_each_entry(pcm, &snd_pcm_devices, list) {
74                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
75                         return -EBUSY;
76                 if (pcm->card->number > newpcm->card->number ||
77                                 (pcm->card == newpcm->card &&
78                                 pcm->device > newpcm->device)) {
79                         list_add(&newpcm->list, pcm->list.prev);
80                         return 0;
81                 }
82         }
83         list_add_tail(&newpcm->list, &snd_pcm_devices);
84         return 0;
85 }
86
87 static int snd_pcm_control_ioctl(struct snd_card *card,
88                                  struct snd_ctl_file *control,
89                                  unsigned int cmd, unsigned long arg)
90 {
91         switch (cmd) {
92         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
93                 {
94                         int device;
95
96                         if (get_user(device, (int __user *)arg))
97                                 return -EFAULT;
98                         mutex_lock(&register_mutex);
99                         device = snd_pcm_next(card, device);
100                         mutex_unlock(&register_mutex);
101                         if (put_user(device, (int __user *)arg))
102                                 return -EFAULT;
103                         return 0;
104                 }
105         case SNDRV_CTL_IOCTL_PCM_INFO:
106                 {
107                         struct snd_pcm_info __user *info;
108                         unsigned int device, subdevice;
109                         int stream;
110                         struct snd_pcm *pcm;
111                         struct snd_pcm_str *pstr;
112                         struct snd_pcm_substream *substream;
113                         int err;
114
115                         info = (struct snd_pcm_info __user *)arg;
116                         if (get_user(device, &info->device))
117                                 return -EFAULT;
118                         if (get_user(stream, &info->stream))
119                                 return -EFAULT;
120                         if (stream < 0 || stream > 1)
121                                 return -EINVAL;
122                         if (get_user(subdevice, &info->subdevice))
123                                 return -EFAULT;
124                         mutex_lock(&register_mutex);
125                         pcm = snd_pcm_get(card, device);
126                         if (pcm == NULL) {
127                                 err = -ENXIO;
128                                 goto _error;
129                         }
130                         pstr = &pcm->streams[stream];
131                         if (pstr->substream_count == 0) {
132                                 err = -ENOENT;
133                                 goto _error;
134                         }
135                         if (subdevice >= pstr->substream_count) {
136                                 err = -ENXIO;
137                                 goto _error;
138                         }
139                         for (substream = pstr->substream; substream;
140                              substream = substream->next)
141                                 if (substream->number == (int)subdevice)
142                                         break;
143                         if (substream == NULL) {
144                                 err = -ENXIO;
145                                 goto _error;
146                         }
147                         err = snd_pcm_info_user(substream, info);
148                 _error:
149                         mutex_unlock(&register_mutex);
150                         return err;
151                 }
152         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
153                 {
154                         int val;
155                         
156                         if (get_user(val, (int __user *)arg))
157                                 return -EFAULT;
158                         control->prefer_pcm_subdevice = val;
159                         return 0;
160                 }
161         }
162         return -ENOIOCTLCMD;
163 }
164
165 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
166
167 static char *snd_pcm_format_names[] = {
168         FORMAT(S8),
169         FORMAT(U8),
170         FORMAT(S16_LE),
171         FORMAT(S16_BE),
172         FORMAT(U16_LE),
173         FORMAT(U16_BE),
174         FORMAT(S24_LE),
175         FORMAT(S24_BE),
176         FORMAT(U24_LE),
177         FORMAT(U24_BE),
178         FORMAT(S32_LE),
179         FORMAT(S32_BE),
180         FORMAT(U32_LE),
181         FORMAT(U32_BE),
182         FORMAT(FLOAT_LE),
183         FORMAT(FLOAT_BE),
184         FORMAT(FLOAT64_LE),
185         FORMAT(FLOAT64_BE),
186         FORMAT(IEC958_SUBFRAME_LE),
187         FORMAT(IEC958_SUBFRAME_BE),
188         FORMAT(MU_LAW),
189         FORMAT(A_LAW),
190         FORMAT(IMA_ADPCM),
191         FORMAT(MPEG),
192         FORMAT(GSM),
193         FORMAT(SPECIAL),
194         FORMAT(S24_3LE),
195         FORMAT(S24_3BE),
196         FORMAT(U24_3LE),
197         FORMAT(U24_3BE),
198         FORMAT(S20_3LE),
199         FORMAT(S20_3BE),
200         FORMAT(U20_3LE),
201         FORMAT(U20_3BE),
202         FORMAT(S18_3LE),
203         FORMAT(S18_3BE),
204         FORMAT(U18_3LE),
205         FORMAT(U18_3BE),
206         FORMAT(G723_24),
207         FORMAT(G723_24_1B),
208         FORMAT(G723_40),
209         FORMAT(G723_40_1B),
210 };
211
212 const char *snd_pcm_format_name(snd_pcm_format_t format)
213 {
214         if (format >= ARRAY_SIZE(snd_pcm_format_names))
215                 return "Unknown";
216         return snd_pcm_format_names[format];
217 }
218 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
219
220 #ifdef CONFIG_SND_VERBOSE_PROCFS
221
222 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
223 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
224 #define READY(v) [SNDRV_PCM_READY_##v] = #v
225 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
226 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
227 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
228 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
229 #define START(v) [SNDRV_PCM_START_##v] = #v
230 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
231
232 static char *snd_pcm_stream_names[] = {
233         STREAM(PLAYBACK),
234         STREAM(CAPTURE),
235 };
236
237 static char *snd_pcm_state_names[] = {
238         STATE(OPEN),
239         STATE(SETUP),
240         STATE(PREPARED),
241         STATE(RUNNING),
242         STATE(XRUN),
243         STATE(DRAINING),
244         STATE(PAUSED),
245         STATE(SUSPENDED),
246 };
247
248 static char *snd_pcm_access_names[] = {
249         ACCESS(MMAP_INTERLEAVED), 
250         ACCESS(MMAP_NONINTERLEAVED),
251         ACCESS(MMAP_COMPLEX),
252         ACCESS(RW_INTERLEAVED),
253         ACCESS(RW_NONINTERLEAVED),
254 };
255
256 static char *snd_pcm_subformat_names[] = {
257         SUBFORMAT(STD), 
258 };
259
260 static char *snd_pcm_tstamp_mode_names[] = {
261         TSTAMP(NONE),
262         TSTAMP(ENABLE),
263 };
264
265 static const char *snd_pcm_stream_name(int stream)
266 {
267         return snd_pcm_stream_names[stream];
268 }
269
270 static const char *snd_pcm_access_name(snd_pcm_access_t access)
271 {
272         return snd_pcm_access_names[access];
273 }
274
275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
276 {
277         return snd_pcm_subformat_names[subformat];
278 }
279
280 static const char *snd_pcm_tstamp_mode_name(int mode)
281 {
282         return snd_pcm_tstamp_mode_names[mode];
283 }
284
285 static const char *snd_pcm_state_name(snd_pcm_state_t state)
286 {
287         return snd_pcm_state_names[state];
288 }
289
290 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
291 #include <linux/soundcard.h>
292
293 static const char *snd_pcm_oss_format_name(int format)
294 {
295         switch (format) {
296         case AFMT_MU_LAW:
297                 return "MU_LAW";
298         case AFMT_A_LAW:
299                 return "A_LAW";
300         case AFMT_IMA_ADPCM:
301                 return "IMA_ADPCM";
302         case AFMT_U8:
303                 return "U8";
304         case AFMT_S16_LE:
305                 return "S16_LE";
306         case AFMT_S16_BE:
307                 return "S16_BE";
308         case AFMT_S8:
309                 return "S8";
310         case AFMT_U16_LE:
311                 return "U16_LE";
312         case AFMT_U16_BE:
313                 return "U16_BE";
314         case AFMT_MPEG:
315                 return "MPEG";
316         default:
317                 return "unknown";
318         }
319 }
320 #endif
321
322 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
323                                    struct snd_info_buffer *buffer)
324 {
325         struct snd_pcm_info *info;
326         int err;
327
328         if (! substream)
329                 return;
330
331         info = kmalloc(sizeof(*info), GFP_KERNEL);
332         if (! info) {
333                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
334                 return;
335         }
336
337         err = snd_pcm_info(substream, info);
338         if (err < 0) {
339                 snd_iprintf(buffer, "error %d\n", err);
340                 kfree(info);
341                 return;
342         }
343         snd_iprintf(buffer, "card: %d\n", info->card);
344         snd_iprintf(buffer, "device: %d\n", info->device);
345         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
346         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
347         snd_iprintf(buffer, "id: %s\n", info->id);
348         snd_iprintf(buffer, "name: %s\n", info->name);
349         snd_iprintf(buffer, "subname: %s\n", info->subname);
350         snd_iprintf(buffer, "class: %d\n", info->dev_class);
351         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
352         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
353         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
354         kfree(info);
355 }
356
357 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
358                                           struct snd_info_buffer *buffer)
359 {
360         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
361                                buffer);
362 }
363
364 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
365                                              struct snd_info_buffer *buffer)
366 {
367         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
368                                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) {
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                 err = snd_pcm_substream_proc_init(substream);
678                 if (err < 0) {
679                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
680                         if (prev == NULL)
681                                 pstr->substream = NULL;
682                         else
683                                 prev->next = NULL;
684                         kfree(substream);
685                         return err;
686                 }
687                 substream->group = &substream->self_group;
688                 spin_lock_init(&substream->self_group.lock);
689                 INIT_LIST_HEAD(&substream->self_group.substreams);
690                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
691                 atomic_set(&substream->mmap_count, 0);
692                 prev = substream;
693         }
694         return 0;
695 }                               
696
697 EXPORT_SYMBOL(snd_pcm_new_stream);
698
699 /**
700  * snd_pcm_new - create a new PCM instance
701  * @card: the card instance
702  * @id: the id string
703  * @device: the device index (zero based)
704  * @playback_count: the number of substreams for playback
705  * @capture_count: the number of substreams for capture
706  * @rpcm: the pointer to store the new pcm instance
707  *
708  * Creates a new PCM instance.
709  *
710  * The pcm operators have to be set afterwards to the new instance
711  * via snd_pcm_set_ops().
712  *
713  * Returns zero if successful, or a negative error code on failure.
714  */
715 int snd_pcm_new(struct snd_card *card, const char *id, int device,
716                 int playback_count, int capture_count,
717                 struct snd_pcm ** rpcm)
718 {
719         struct snd_pcm *pcm;
720         int err;
721         static struct snd_device_ops ops = {
722                 .dev_free = snd_pcm_dev_free,
723                 .dev_register = snd_pcm_dev_register,
724                 .dev_disconnect = snd_pcm_dev_disconnect,
725         };
726
727         if (snd_BUG_ON(!card))
728                 return -ENXIO;
729         if (rpcm)
730                 *rpcm = NULL;
731         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
732         if (pcm == NULL) {
733                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
734                 return -ENOMEM;
735         }
736         pcm->card = card;
737         pcm->device = device;
738         if (id)
739                 strlcpy(pcm->id, id, sizeof(pcm->id));
740         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
741                 snd_pcm_free(pcm);
742                 return err;
743         }
744         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
745                 snd_pcm_free(pcm);
746                 return err;
747         }
748         mutex_init(&pcm->open_mutex);
749         init_waitqueue_head(&pcm->open_wait);
750         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
751                 snd_pcm_free(pcm);
752                 return err;
753         }
754         if (rpcm)
755                 *rpcm = pcm;
756         return 0;
757 }
758
759 EXPORT_SYMBOL(snd_pcm_new);
760
761 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
762 {
763         struct snd_pcm_substream *substream, *substream_next;
764 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
765         struct snd_pcm_oss_setup *setup, *setupn;
766 #endif
767         substream = pstr->substream;
768         while (substream) {
769                 substream_next = substream->next;
770                 snd_pcm_timer_done(substream);
771                 snd_pcm_substream_proc_done(substream);
772                 kfree(substream);
773                 substream = substream_next;
774         }
775         snd_pcm_stream_proc_done(pstr);
776 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
777         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
778                 setupn = setup->next;
779                 kfree(setup->task_name);
780                 kfree(setup);
781         }
782 #endif
783 }
784
785 static int snd_pcm_free(struct snd_pcm *pcm)
786 {
787         struct snd_pcm_notify *notify;
788
789         if (!pcm)
790                 return 0;
791         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
792                 notify->n_unregister(pcm);
793         }
794         if (pcm->private_free)
795                 pcm->private_free(pcm);
796         snd_pcm_lib_preallocate_free_for_all(pcm);
797         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
798         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
799         kfree(pcm);
800         return 0;
801 }
802
803 static int snd_pcm_dev_free(struct snd_device *device)
804 {
805         struct snd_pcm *pcm = device->device_data;
806         return snd_pcm_free(pcm);
807 }
808
809 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
810                              struct file *file,
811                              struct snd_pcm_substream **rsubstream)
812 {
813         struct snd_pcm_str * pstr;
814         struct snd_pcm_substream *substream;
815         struct snd_pcm_runtime *runtime;
816         struct snd_ctl_file *kctl;
817         struct snd_card *card;
818         int prefer_subdevice = -1;
819         size_t size;
820
821         if (snd_BUG_ON(!pcm || !rsubstream))
822                 return -ENXIO;
823         *rsubstream = NULL;
824         pstr = &pcm->streams[stream];
825         if (pstr->substream == NULL || pstr->substream_count == 0)
826                 return -ENODEV;
827
828         card = pcm->card;
829         read_lock(&card->ctl_files_rwlock);
830         list_for_each_entry(kctl, &card->ctl_files, list) {
831                 if (kctl->pid == task_pid(current)) {
832                         prefer_subdevice = kctl->prefer_pcm_subdevice;
833                         if (prefer_subdevice != -1)
834                                 break;
835                 }
836         }
837         read_unlock(&card->ctl_files_rwlock);
838
839         switch (stream) {
840         case SNDRV_PCM_STREAM_PLAYBACK:
841                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
842                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
843                                 if (SUBSTREAM_BUSY(substream))
844                                         return -EAGAIN;
845                         }
846                 }
847                 break;
848         case SNDRV_PCM_STREAM_CAPTURE:
849                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
850                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
851                                 if (SUBSTREAM_BUSY(substream))
852                                         return -EAGAIN;
853                         }
854                 }
855                 break;
856         default:
857                 return -EINVAL;
858         }
859
860         if (file->f_flags & O_APPEND) {
861                 if (prefer_subdevice < 0) {
862                         if (pstr->substream_count > 1)
863                                 return -EINVAL; /* must be unique */
864                         substream = pstr->substream;
865                 } else {
866                         for (substream = pstr->substream; substream;
867                              substream = substream->next)
868                                 if (substream->number == prefer_subdevice)
869                                         break;
870                 }
871                 if (! substream)
872                         return -ENODEV;
873                 if (! SUBSTREAM_BUSY(substream))
874                         return -EBADFD;
875                 substream->ref_count++;
876                 *rsubstream = substream;
877                 return 0;
878         }
879
880         if (prefer_subdevice >= 0) {
881                 for (substream = pstr->substream; substream; substream = substream->next)
882                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
883                                 goto __ok;
884         }
885         for (substream = pstr->substream; substream; substream = substream->next)
886                 if (!SUBSTREAM_BUSY(substream))
887                         break;
888       __ok:
889         if (substream == NULL)
890                 return -EAGAIN;
891
892         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
893         if (runtime == NULL)
894                 return -ENOMEM;
895
896         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
897         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
898         if (runtime->status == NULL) {
899                 kfree(runtime);
900                 return -ENOMEM;
901         }
902         memset((void*)runtime->status, 0, size);
903
904         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
905         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
906         if (runtime->control == NULL) {
907                 snd_free_pages((void*)runtime->status,
908                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
909                 kfree(runtime);
910                 return -ENOMEM;
911         }
912         memset((void*)runtime->control, 0, size);
913
914         init_waitqueue_head(&runtime->sleep);
915         init_waitqueue_head(&runtime->tsleep);
916
917         runtime->status->state = SNDRV_PCM_STATE_OPEN;
918
919         substream->runtime = runtime;
920         substream->private_data = pcm->private_data;
921         substream->ref_count = 1;
922         substream->f_flags = file->f_flags;
923         substream->pid = get_pid(task_pid(current));
924         pstr->substream_opened++;
925         *rsubstream = substream;
926         return 0;
927 }
928
929 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
930 {
931         struct snd_pcm_runtime *runtime;
932
933         if (PCM_RUNTIME_CHECK(substream))
934                 return;
935         runtime = substream->runtime;
936         if (runtime->private_free != NULL)
937                 runtime->private_free(runtime);
938         snd_free_pages((void*)runtime->status,
939                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
940         snd_free_pages((void*)runtime->control,
941                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
942         kfree(runtime->hw_constraints.rules);
943 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
944         if (runtime->hwptr_log)
945                 kfree(runtime->hwptr_log);
946 #endif
947         kfree(runtime);
948         substream->runtime = NULL;
949         put_pid(substream->pid);
950         substream->pid = NULL;
951         substream->pstr->substream_opened--;
952 }
953
954 static ssize_t show_pcm_class(struct device *dev,
955                               struct device_attribute *attr, char *buf)
956 {
957         struct snd_pcm *pcm;
958         const char *str;
959         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
960                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
961                 [SNDRV_PCM_CLASS_MULTI] = "multi",
962                 [SNDRV_PCM_CLASS_MODEM] = "modem",
963                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
964         };
965
966         if (! (pcm = dev_get_drvdata(dev)) ||
967             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
968                 str = "none";
969         else
970                 str = strs[pcm->dev_class];
971         return snprintf(buf, PAGE_SIZE, "%s\n", str);
972 }
973
974 static struct device_attribute pcm_attrs =
975         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
976
977 static int snd_pcm_dev_register(struct snd_device *device)
978 {
979         int cidx, err;
980         struct snd_pcm_substream *substream;
981         struct snd_pcm_notify *notify;
982         char str[16];
983         struct snd_pcm *pcm;
984         struct device *dev;
985
986         if (snd_BUG_ON(!device || !device->device_data))
987                 return -ENXIO;
988         pcm = device->device_data;
989         mutex_lock(&register_mutex);
990         err = snd_pcm_add(pcm);
991         if (err) {
992                 mutex_unlock(&register_mutex);
993                 return err;
994         }
995         for (cidx = 0; cidx < 2; cidx++) {
996                 int devtype = -1;
997                 if (pcm->streams[cidx].substream == NULL)
998                         continue;
999                 switch (cidx) {
1000                 case SNDRV_PCM_STREAM_PLAYBACK:
1001                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1002                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1003                         break;
1004                 case SNDRV_PCM_STREAM_CAPTURE:
1005                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1006                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1007                         break;
1008                 }
1009                 /* device pointer to use, pcm->dev takes precedence if
1010                  * it is assigned, otherwise fall back to card's device
1011                  * if possible */
1012                 dev = pcm->dev;
1013                 if (!dev)
1014                         dev = snd_card_get_device_link(pcm->card);
1015                 /* register pcm */
1016                 err = snd_register_device_for_dev(devtype, pcm->card,
1017                                                   pcm->device,
1018                                                   &snd_pcm_f_ops[cidx],
1019                                                   pcm, str, dev);
1020                 if (err < 0) {
1021                         list_del(&pcm->list);
1022                         mutex_unlock(&register_mutex);
1023                         return err;
1024                 }
1025                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1026                                           &pcm_attrs);
1027                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1028                         snd_pcm_timer_init(substream);
1029         }
1030
1031         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1032                 notify->n_register(pcm);
1033
1034         mutex_unlock(&register_mutex);
1035         return 0;
1036 }
1037
1038 static int snd_pcm_dev_disconnect(struct snd_device *device)
1039 {
1040         struct snd_pcm *pcm = device->device_data;
1041         struct snd_pcm_notify *notify;
1042         struct snd_pcm_substream *substream;
1043         int cidx, devtype;
1044
1045         mutex_lock(&register_mutex);
1046         if (list_empty(&pcm->list))
1047                 goto unlock;
1048
1049         list_del_init(&pcm->list);
1050         for (cidx = 0; cidx < 2; cidx++)
1051                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1052                         if (substream->runtime)
1053                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1054         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1055                 notify->n_disconnect(pcm);
1056         }
1057         for (cidx = 0; cidx < 2; cidx++) {
1058                 devtype = -1;
1059                 switch (cidx) {
1060                 case SNDRV_PCM_STREAM_PLAYBACK:
1061                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1062                         break;
1063                 case SNDRV_PCM_STREAM_CAPTURE:
1064                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1065                         break;
1066                 }
1067                 snd_unregister_device(devtype, pcm->card, pcm->device);
1068         }
1069  unlock:
1070         mutex_unlock(&register_mutex);
1071         return 0;
1072 }
1073
1074 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1075 {
1076         struct snd_pcm *pcm;
1077
1078         if (snd_BUG_ON(!notify ||
1079                        !notify->n_register ||
1080                        !notify->n_unregister ||
1081                        !notify->n_disconnect))
1082                 return -EINVAL;
1083         mutex_lock(&register_mutex);
1084         if (nfree) {
1085                 list_del(&notify->list);
1086                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1087                         notify->n_unregister(pcm);
1088         } else {
1089                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1090                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1091                         notify->n_register(pcm);
1092         }
1093         mutex_unlock(&register_mutex);
1094         return 0;
1095 }
1096
1097 EXPORT_SYMBOL(snd_pcm_notify);
1098
1099 #ifdef CONFIG_PROC_FS
1100 /*
1101  *  Info interface
1102  */
1103
1104 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1105                               struct snd_info_buffer *buffer)
1106 {
1107         struct snd_pcm *pcm;
1108
1109         mutex_lock(&register_mutex);
1110         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1111                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1112                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1113                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1114                         snd_iprintf(buffer, " : playback %i",
1115                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1116                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1117                         snd_iprintf(buffer, " : capture %i",
1118                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1119                 snd_iprintf(buffer, "\n");
1120         }
1121         mutex_unlock(&register_mutex);
1122 }
1123
1124 static struct snd_info_entry *snd_pcm_proc_entry;
1125
1126 static void snd_pcm_proc_init(void)
1127 {
1128         struct snd_info_entry *entry;
1129
1130         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1131                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1132                 if (snd_info_register(entry) < 0) {
1133                         snd_info_free_entry(entry);
1134                         entry = NULL;
1135                 }
1136         }
1137         snd_pcm_proc_entry = entry;
1138 }
1139
1140 static void snd_pcm_proc_done(void)
1141 {
1142         snd_info_free_entry(snd_pcm_proc_entry);
1143 }
1144
1145 #else /* !CONFIG_PROC_FS */
1146 #define snd_pcm_proc_init()
1147 #define snd_pcm_proc_done()
1148 #endif /* CONFIG_PROC_FS */
1149
1150
1151 /*
1152  *  ENTRY functions
1153  */
1154
1155 static int __init alsa_pcm_init(void)
1156 {
1157         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1158         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1159         snd_pcm_proc_init();
1160         return 0;
1161 }
1162
1163 static void __exit alsa_pcm_exit(void)
1164 {
1165         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1166         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1167         snd_pcm_proc_done();
1168 }
1169
1170 module_init(alsa_pcm_init)
1171 module_exit(alsa_pcm_exit)