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