Merge git://git.kernel.org/pub/scm/linux/kernel/git/perex/alsa
[linux-2.6] / sound / core / pcm.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.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@suse.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 DECLARE_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 static int snd_pcm_dev_unregister(struct snd_device *device);
45
46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
47 {
48         struct list_head *p;
49         struct snd_pcm *pcm;
50
51         list_for_each(p, &snd_pcm_devices) {
52                 pcm = list_entry(p, struct snd_pcm, list);
53                 if (pcm->card == card && pcm->device == device)
54                         return pcm;
55         }
56         return NULL;
57 }
58
59 static int snd_pcm_control_ioctl(struct snd_card *card,
60                                  struct snd_ctl_file *control,
61                                  unsigned int cmd, unsigned long arg)
62 {
63         switch (cmd) {
64         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
65                 {
66                         int device;
67
68                         if (get_user(device, (int __user *)arg))
69                                 return -EFAULT;
70                         down(&register_mutex);
71                         device = device < 0 ? 0 : device + 1;
72                         while (device < SNDRV_PCM_DEVICES) {
73                                 if (snd_pcm_search(card, device))
74                                         break;
75                                 device++;
76                         }
77                         if (device == SNDRV_PCM_DEVICES)
78                                 device = -1;
79                         up(&register_mutex);
80                         if (put_user(device, (int __user *)arg))
81                                 return -EFAULT;
82                         return 0;
83                 }
84         case SNDRV_CTL_IOCTL_PCM_INFO:
85                 {
86                         struct snd_pcm_info __user *info;
87                         unsigned int device, subdevice;
88                         int stream;
89                         struct snd_pcm *pcm;
90                         struct snd_pcm_str *pstr;
91                         struct snd_pcm_substream *substream;
92                         int err;
93
94                         info = (struct snd_pcm_info __user *)arg;
95                         if (get_user(device, &info->device))
96                                 return -EFAULT;
97                         if (get_user(stream, &info->stream))
98                                 return -EFAULT;
99                         if (stream < 0 || stream > 1)
100                                 return -EINVAL;
101                         if (get_user(subdevice, &info->subdevice))
102                                 return -EFAULT;
103                         down(&register_mutex);
104                         pcm = snd_pcm_search(card, device);
105                         if (pcm == NULL) {
106                                 err = -ENXIO;
107                                 goto _error;
108                         }
109                         pstr = &pcm->streams[stream];
110                         if (pstr->substream_count == 0) {
111                                 err = -ENOENT;
112                                 goto _error;
113                         }
114                         if (subdevice >= pstr->substream_count) {
115                                 err = -ENXIO;
116                                 goto _error;
117                         }
118                         for (substream = pstr->substream; substream;
119                              substream = substream->next)
120                                 if (substream->number == (int)subdevice)
121                                         break;
122                         if (substream == NULL) {
123                                 err = -ENXIO;
124                                 goto _error;
125                         }
126                         err = snd_pcm_info_user(substream, info);
127                 _error:
128                         up(&register_mutex);
129                         return err;
130                 }
131         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
132                 {
133                         int val;
134                         
135                         if (get_user(val, (int __user *)arg))
136                                 return -EFAULT;
137                         control->prefer_pcm_subdevice = val;
138                         return 0;
139                 }
140         }
141         return -ENOIOCTLCMD;
142 }
143 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
144 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
145 #define READY(v) [SNDRV_PCM_READY_##v] = #v
146 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
147 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
148 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
149 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
150 #define START(v) [SNDRV_PCM_START_##v] = #v
151 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
152 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
153
154 static char *snd_pcm_format_names[] = {
155         FORMAT(S8),
156         FORMAT(U8),
157         FORMAT(S16_LE),
158         FORMAT(S16_BE),
159         FORMAT(U16_LE),
160         FORMAT(U16_BE),
161         FORMAT(S24_LE),
162         FORMAT(S24_BE),
163         FORMAT(U24_LE),
164         FORMAT(U24_BE),
165         FORMAT(S32_LE),
166         FORMAT(S32_BE),
167         FORMAT(U32_LE),
168         FORMAT(U32_BE),
169         FORMAT(FLOAT_LE),
170         FORMAT(FLOAT_BE),
171         FORMAT(FLOAT64_LE),
172         FORMAT(FLOAT64_BE),
173         FORMAT(IEC958_SUBFRAME_LE),
174         FORMAT(IEC958_SUBFRAME_BE),
175         FORMAT(MU_LAW),
176         FORMAT(A_LAW),
177         FORMAT(IMA_ADPCM),
178         FORMAT(MPEG),
179         FORMAT(GSM),
180         FORMAT(SPECIAL),
181         FORMAT(S24_3LE),
182         FORMAT(S24_3BE),
183         FORMAT(U24_3LE),
184         FORMAT(U24_3BE),
185         FORMAT(S20_3LE),
186         FORMAT(S20_3BE),
187         FORMAT(U20_3LE),
188         FORMAT(U20_3BE),
189         FORMAT(S18_3LE),
190         FORMAT(S18_3BE),
191         FORMAT(U18_3LE),
192         FORMAT(U18_3BE),
193 };
194
195 const char *snd_pcm_format_name(snd_pcm_format_t format)
196 {
197         return snd_pcm_format_names[format];
198 }
199
200 #ifdef CONFIG_PROC_FS
201 static char *snd_pcm_stream_names[] = {
202         STREAM(PLAYBACK),
203         STREAM(CAPTURE),
204 };
205
206 static char *snd_pcm_state_names[] = {
207         STATE(OPEN),
208         STATE(SETUP),
209         STATE(PREPARED),
210         STATE(RUNNING),
211         STATE(XRUN),
212         STATE(DRAINING),
213         STATE(PAUSED),
214         STATE(SUSPENDED),
215 };
216
217 static char *snd_pcm_access_names[] = {
218         ACCESS(MMAP_INTERLEAVED), 
219         ACCESS(MMAP_NONINTERLEAVED),
220         ACCESS(MMAP_COMPLEX),
221         ACCESS(RW_INTERLEAVED),
222         ACCESS(RW_NONINTERLEAVED),
223 };
224
225 static char *snd_pcm_subformat_names[] = {
226         SUBFORMAT(STD), 
227 };
228
229 static char *snd_pcm_tstamp_mode_names[] = {
230         TSTAMP(NONE),
231         TSTAMP(MMAP),
232 };
233
234 static const char *snd_pcm_stream_name(int stream)
235 {
236         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
237         return snd_pcm_stream_names[stream];
238 }
239
240 static const char *snd_pcm_access_name(snd_pcm_access_t access)
241 {
242         return snd_pcm_access_names[access];
243 }
244
245 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
246 {
247         return snd_pcm_subformat_names[subformat];
248 }
249
250 static const char *snd_pcm_tstamp_mode_name(int mode)
251 {
252         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
253         return snd_pcm_tstamp_mode_names[mode];
254 }
255
256 static const char *snd_pcm_state_name(snd_pcm_state_t state)
257 {
258         return snd_pcm_state_names[state];
259 }
260
261 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
262 #include <linux/soundcard.h>
263 static const char *snd_pcm_oss_format_name(int format)
264 {
265         switch (format) {
266         case AFMT_MU_LAW:
267                 return "MU_LAW";
268         case AFMT_A_LAW:
269                 return "A_LAW";
270         case AFMT_IMA_ADPCM:
271                 return "IMA_ADPCM";
272         case AFMT_U8:
273                 return "U8";
274         case AFMT_S16_LE:
275                 return "S16_LE";
276         case AFMT_S16_BE:
277                 return "S16_BE";
278         case AFMT_S8:
279                 return "S8";
280         case AFMT_U16_LE:
281                 return "U16_LE";
282         case AFMT_U16_BE:
283                 return "U16_BE";
284         case AFMT_MPEG:
285                 return "MPEG";
286         default:
287                 return "unknown";
288         }
289 }
290 #endif
291
292 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
293                                    struct snd_info_buffer *buffer)
294 {
295         struct snd_pcm_info *info;
296         int err;
297
298         if (! substream)
299                 return;
300
301         info = kmalloc(sizeof(*info), GFP_KERNEL);
302         if (! info) {
303                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
304                 return;
305         }
306
307         err = snd_pcm_info(substream, info);
308         if (err < 0) {
309                 snd_iprintf(buffer, "error %d\n", err);
310                 kfree(info);
311                 return;
312         }
313         snd_iprintf(buffer, "card: %d\n", info->card);
314         snd_iprintf(buffer, "device: %d\n", info->device);
315         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
316         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
317         snd_iprintf(buffer, "id: %s\n", info->id);
318         snd_iprintf(buffer, "name: %s\n", info->name);
319         snd_iprintf(buffer, "subname: %s\n", info->subname);
320         snd_iprintf(buffer, "class: %d\n", info->dev_class);
321         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
322         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
323         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
324         kfree(info);
325 }
326
327 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
328                                           struct snd_info_buffer *buffer)
329 {
330         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
331                                buffer);
332 }
333
334 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
335                                              struct snd_info_buffer *buffer)
336 {
337         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
338                                buffer);
339 }
340
341 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
342                                                   struct snd_info_buffer *buffer)
343 {
344         struct snd_pcm_substream *substream = entry->private_data;
345         struct snd_pcm_runtime *runtime = substream->runtime;
346         if (!runtime) {
347                 snd_iprintf(buffer, "closed\n");
348                 return;
349         }
350         snd_pcm_stream_lock_irq(substream);
351         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
352                 snd_iprintf(buffer, "no setup\n");
353                 snd_pcm_stream_unlock_irq(substream);
354                 return;
355         }
356         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
357         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
358         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
359         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
360         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
361         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
362         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
363         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
364 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
365         if (substream->oss.oss) {
366                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
367                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
368                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
369                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
370                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
371                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
372         }
373 #endif
374         snd_pcm_stream_unlock_irq(substream);
375 }
376
377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
378                                                   struct snd_info_buffer *buffer)
379 {
380         struct snd_pcm_substream *substream = entry->private_data;
381         struct snd_pcm_runtime *runtime = substream->runtime;
382         if (!runtime) {
383                 snd_iprintf(buffer, "closed\n");
384                 return;
385         }
386         snd_pcm_stream_lock_irq(substream);
387         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
388                 snd_iprintf(buffer, "no setup\n");
389                 snd_pcm_stream_unlock_irq(substream);
390                 return;
391         }
392         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
393         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
394         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
395         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
396         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
397         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
398         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
399         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
400         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
401         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
402         snd_pcm_stream_unlock_irq(substream);
403 }
404
405 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
406                                                struct snd_info_buffer *buffer)
407 {
408         struct snd_pcm_substream *substream = entry->private_data;
409         struct snd_pcm_runtime *runtime = substream->runtime;
410         struct snd_pcm_status status;
411         int err;
412         if (!runtime) {
413                 snd_iprintf(buffer, "closed\n");
414                 return;
415         }
416         memset(&status, 0, sizeof(status));
417         err = snd_pcm_status(substream, &status);
418         if (err < 0) {
419                 snd_iprintf(buffer, "error %d\n", err);
420                 return;
421         }
422         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
423         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
424                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
425         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
426                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
427         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
428         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
429         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
430         snd_iprintf(buffer, "-----\n");
431         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
432         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
433 }
434
435 #ifdef CONFIG_SND_DEBUG
436 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
437                                     struct snd_info_buffer *buffer)
438 {
439         struct snd_pcm_str *pstr = entry->private_data;
440         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
441 }
442
443 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
444                                      struct snd_info_buffer *buffer)
445 {
446         struct snd_pcm_str *pstr = entry->private_data;
447         char line[64];
448         if (!snd_info_get_line(buffer, line, sizeof(line)))
449                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
450 }
451 #endif
452
453 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
454 {
455         struct snd_pcm *pcm = pstr->pcm;
456         struct snd_info_entry *entry;
457         char name[16];
458
459         sprintf(name, "pcm%i%c", pcm->device, 
460                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
461         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
462                 return -ENOMEM;
463         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
464         if (snd_info_register(entry) < 0) {
465                 snd_info_free_entry(entry);
466                 return -ENOMEM;
467         }
468         pstr->proc_root = entry;
469
470         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
471                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
472                 if (snd_info_register(entry) < 0) {
473                         snd_info_free_entry(entry);
474                         entry = NULL;
475                 }
476         }
477         pstr->proc_info_entry = entry;
478
479 #ifdef CONFIG_SND_DEBUG
480         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
481                                                 pstr->proc_root)) != NULL) {
482                 entry->c.text.read_size = 64;
483                 entry->c.text.read = snd_pcm_xrun_debug_read;
484                 entry->c.text.write_size = 64;
485                 entry->c.text.write = snd_pcm_xrun_debug_write;
486                 entry->mode |= S_IWUSR;
487                 entry->private_data = pstr;
488                 if (snd_info_register(entry) < 0) {
489                         snd_info_free_entry(entry);
490                         entry = NULL;
491                 }
492         }
493         pstr->proc_xrun_debug_entry = entry;
494 #endif
495         return 0;
496 }
497
498 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
499 {
500 #ifdef CONFIG_SND_DEBUG
501         if (pstr->proc_xrun_debug_entry) {
502                 snd_info_unregister(pstr->proc_xrun_debug_entry);
503                 pstr->proc_xrun_debug_entry = NULL;
504         }
505 #endif
506         if (pstr->proc_info_entry) {
507                 snd_info_unregister(pstr->proc_info_entry);
508                 pstr->proc_info_entry = NULL;
509         }
510         if (pstr->proc_root) {
511                 snd_info_unregister(pstr->proc_root);
512                 pstr->proc_root = NULL;
513         }
514         return 0;
515 }
516
517 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
518 {
519         struct snd_info_entry *entry;
520         struct snd_card *card;
521         char name[16];
522
523         card = substream->pcm->card;
524
525         sprintf(name, "sub%i", substream->number);
526         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
527                 return -ENOMEM;
528         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
529         if (snd_info_register(entry) < 0) {
530                 snd_info_free_entry(entry);
531                 return -ENOMEM;
532         }
533         substream->proc_root = entry;
534
535         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
536                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
537                 if (snd_info_register(entry) < 0) {
538                         snd_info_free_entry(entry);
539                         entry = NULL;
540                 }
541         }
542         substream->proc_info_entry = entry;
543
544         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
545                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
546                 if (snd_info_register(entry) < 0) {
547                         snd_info_free_entry(entry);
548                         entry = NULL;
549                 }
550         }
551         substream->proc_hw_params_entry = entry;
552
553         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
554                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
555                 if (snd_info_register(entry) < 0) {
556                         snd_info_free_entry(entry);
557                         entry = NULL;
558                 }
559         }
560         substream->proc_sw_params_entry = entry;
561
562         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
563                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
564                 if (snd_info_register(entry) < 0) {
565                         snd_info_free_entry(entry);
566                         entry = NULL;
567                 }
568         }
569         substream->proc_status_entry = entry;
570
571         return 0;
572 }
573                 
574 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
575 {
576         if (substream->proc_info_entry) {
577                 snd_info_unregister(substream->proc_info_entry);
578                 substream->proc_info_entry = NULL;
579         }
580         if (substream->proc_hw_params_entry) {
581                 snd_info_unregister(substream->proc_hw_params_entry);
582                 substream->proc_hw_params_entry = NULL;
583         }
584         if (substream->proc_sw_params_entry) {
585                 snd_info_unregister(substream->proc_sw_params_entry);
586                 substream->proc_sw_params_entry = NULL;
587         }
588         if (substream->proc_status_entry) {
589                 snd_info_unregister(substream->proc_status_entry);
590                 substream->proc_status_entry = NULL;
591         }
592         if (substream->proc_root) {
593                 snd_info_unregister(substream->proc_root);
594                 substream->proc_root = NULL;
595         }
596         return 0;
597 }
598 #else /* !CONFIG_PROC_FS */
599 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
600 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
601 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
602 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
603 #endif /* CONFIG_PROC_FS */
604
605 /**
606  * snd_pcm_new_stream - create a new PCM stream
607  * @pcm: the pcm instance
608  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
609  * @substream_count: the number of substreams
610  *
611  * Creates a new stream for the pcm.
612  * The corresponding stream on the pcm must have been empty before
613  * calling this, i.e. zero must be given to the argument of
614  * snd_pcm_new().
615  *
616  * Returns zero if successful, or a negative error code on failure.
617  */
618 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
619 {
620         int idx, err;
621         struct snd_pcm_str *pstr = &pcm->streams[stream];
622         struct snd_pcm_substream *substream, *prev;
623
624 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
625         init_MUTEX(&pstr->oss.setup_mutex);
626 #endif
627         pstr->stream = stream;
628         pstr->pcm = pcm;
629         pstr->substream_count = substream_count;
630         if (substream_count > 0) {
631                 err = snd_pcm_stream_proc_init(pstr);
632                 if (err < 0) {
633                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
634                         return err;
635                 }
636         }
637         prev = NULL;
638         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
639                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
640                 if (substream == NULL) {
641                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
642                         return -ENOMEM;
643                 }
644                 substream->pcm = pcm;
645                 substream->pstr = pstr;
646                 substream->number = idx;
647                 substream->stream = stream;
648                 sprintf(substream->name, "subdevice #%i", idx);
649                 substream->buffer_bytes_max = UINT_MAX;
650                 if (prev == NULL)
651                         pstr->substream = substream;
652                 else
653                         prev->next = substream;
654                 err = snd_pcm_substream_proc_init(substream);
655                 if (err < 0) {
656                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
657                         kfree(substream);
658                         return err;
659                 }
660                 substream->group = &substream->self_group;
661                 spin_lock_init(&substream->self_group.lock);
662                 INIT_LIST_HEAD(&substream->self_group.substreams);
663                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
664                 spin_lock_init(&substream->timer_lock);
665                 prev = substream;
666         }
667         return 0;
668 }                               
669
670 /**
671  * snd_pcm_new - create a new PCM instance
672  * @card: the card instance
673  * @id: the id string
674  * @device: the device index (zero based)
675  * @playback_count: the number of substreams for playback
676  * @capture_count: the number of substreams for capture
677  * @rpcm: the pointer to store the new pcm instance
678  *
679  * Creates a new PCM instance.
680  *
681  * The pcm operators have to be set afterwards to the new instance
682  * via snd_pcm_set_ops().
683  *
684  * Returns zero if successful, or a negative error code on failure.
685  */
686 int snd_pcm_new(struct snd_card *card, char *id, int device,
687                 int playback_count, int capture_count,
688                 struct snd_pcm ** rpcm)
689 {
690         struct snd_pcm *pcm;
691         int err;
692         static struct snd_device_ops ops = {
693                 .dev_free = snd_pcm_dev_free,
694                 .dev_register = snd_pcm_dev_register,
695                 .dev_disconnect = snd_pcm_dev_disconnect,
696                 .dev_unregister = snd_pcm_dev_unregister
697         };
698
699         snd_assert(rpcm != NULL, return -EINVAL);
700         *rpcm = NULL;
701         snd_assert(card != NULL, return -ENXIO);
702         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
703         if (pcm == NULL) {
704                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
705                 return -ENOMEM;
706         }
707         pcm->card = card;
708         pcm->device = device;
709         if (id)
710                 strlcpy(pcm->id, id, sizeof(pcm->id));
711         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
712                 snd_pcm_free(pcm);
713                 return err;
714         }
715         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
716                 snd_pcm_free(pcm);
717                 return err;
718         }
719         init_MUTEX(&pcm->open_mutex);
720         init_waitqueue_head(&pcm->open_wait);
721         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
722                 snd_pcm_free(pcm);
723                 return err;
724         }
725         *rpcm = pcm;
726         return 0;
727 }
728
729 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
730 {
731         struct snd_pcm_substream *substream, *substream_next;
732 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
733         struct snd_pcm_oss_setup *setup, *setupn;
734 #endif
735         substream = pstr->substream;
736         while (substream) {
737                 substream_next = substream->next;
738                 snd_pcm_substream_proc_done(substream);
739                 kfree(substream);
740                 substream = substream_next;
741         }
742         snd_pcm_stream_proc_done(pstr);
743 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
744         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
745                 setupn = setup->next;
746                 kfree(setup->task_name);
747                 kfree(setup);
748         }
749 #endif
750 }
751
752 static int snd_pcm_free(struct snd_pcm *pcm)
753 {
754         snd_assert(pcm != NULL, return -ENXIO);
755         if (pcm->private_free)
756                 pcm->private_free(pcm);
757         snd_pcm_lib_preallocate_free_for_all(pcm);
758         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
759         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
760         kfree(pcm);
761         return 0;
762 }
763
764 static int snd_pcm_dev_free(struct snd_device *device)
765 {
766         struct snd_pcm *pcm = device->device_data;
767         return snd_pcm_free(pcm);
768 }
769
770 static void snd_pcm_tick_timer_func(unsigned long data)
771 {
772         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
773         snd_pcm_tick_elapsed(substream);
774 }
775
776 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
777                            struct snd_pcm_substream **rsubstream)
778 {
779         struct snd_pcm_str * pstr;
780         struct snd_pcm_substream *substream;
781         struct snd_pcm_runtime *runtime;
782         struct snd_ctl_file *kctl;
783         struct snd_card *card;
784         struct list_head *list;
785         int prefer_subdevice = -1;
786         size_t size;
787
788         snd_assert(rsubstream != NULL, return -EINVAL);
789         *rsubstream = NULL;
790         snd_assert(pcm != NULL, return -ENXIO);
791         pstr = &pcm->streams[stream];
792         if (pstr->substream == NULL)
793                 return -ENODEV;
794
795         card = pcm->card;
796         down_read(&card->controls_rwsem);
797         list_for_each(list, &card->ctl_files) {
798                 kctl = snd_ctl_file(list);
799                 if (kctl->pid == current->pid) {
800                         prefer_subdevice = kctl->prefer_pcm_subdevice;
801                         break;
802                 }
803         }
804         up_read(&card->controls_rwsem);
805
806         if (pstr->substream_count == 0)
807                 return -ENODEV;
808         switch (stream) {
809         case SNDRV_PCM_STREAM_PLAYBACK:
810                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
811                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
812                                 if (SUBSTREAM_BUSY(substream))
813                                         return -EAGAIN;
814                         }
815                 }
816                 break;
817         case SNDRV_PCM_STREAM_CAPTURE:
818                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
819                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
820                                 if (SUBSTREAM_BUSY(substream))
821                                         return -EAGAIN;
822                         }
823                 }
824                 break;
825         default:
826                 return -EINVAL;
827         }
828
829         if (prefer_subdevice >= 0) {
830                 for (substream = pstr->substream; substream; substream = substream->next)
831                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
832                                 goto __ok;
833         }
834         for (substream = pstr->substream; substream; substream = substream->next)
835                 if (!SUBSTREAM_BUSY(substream))
836                         break;
837       __ok:
838         if (substream == NULL)
839                 return -EAGAIN;
840
841         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
842         if (runtime == NULL)
843                 return -ENOMEM;
844
845         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
846         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
847         if (runtime->status == NULL) {
848                 kfree(runtime);
849                 return -ENOMEM;
850         }
851         memset((void*)runtime->status, 0, size);
852
853         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
854         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
855         if (runtime->control == NULL) {
856                 snd_free_pages((void*)runtime->status,
857                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
858                 kfree(runtime);
859                 return -ENOMEM;
860         }
861         memset((void*)runtime->control, 0, size);
862
863         init_waitqueue_head(&runtime->sleep);
864         atomic_set(&runtime->mmap_count, 0);
865         init_timer(&runtime->tick_timer);
866         runtime->tick_timer.function = snd_pcm_tick_timer_func;
867         runtime->tick_timer.data = (unsigned long) substream;
868
869         runtime->status->state = SNDRV_PCM_STATE_OPEN;
870
871         substream->runtime = runtime;
872         substream->private_data = pcm->private_data;
873         pstr->substream_opened++;
874         *rsubstream = substream;
875         return 0;
876 }
877
878 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
879 {
880         struct snd_pcm_runtime *runtime;
881         substream->file = NULL;
882         runtime = substream->runtime;
883         snd_assert(runtime != NULL, return);
884         if (runtime->private_free != NULL)
885                 runtime->private_free(runtime);
886         snd_free_pages((void*)runtime->status,
887                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
888         snd_free_pages((void*)runtime->control,
889                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
890         kfree(runtime->hw_constraints.rules);
891         kfree(runtime);
892         substream->runtime = NULL;
893         substream->pstr->substream_opened--;
894 }
895
896 static int snd_pcm_dev_register(struct snd_device *device)
897 {
898         int cidx, err;
899         struct snd_pcm_substream *substream;
900         struct list_head *list;
901         char str[16];
902         struct snd_pcm *pcm = device->device_data;
903
904         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
905         down(&register_mutex);
906         if (snd_pcm_search(pcm->card, pcm->device)) {
907                 up(&register_mutex);
908                 return -EBUSY;
909         }
910         list_add_tail(&pcm->list, &snd_pcm_devices);
911         for (cidx = 0; cidx < 2; cidx++) {
912                 int devtype = -1;
913                 if (pcm->streams[cidx].substream == NULL)
914                         continue;
915                 switch (cidx) {
916                 case SNDRV_PCM_STREAM_PLAYBACK:
917                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
918                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
919                         break;
920                 case SNDRV_PCM_STREAM_CAPTURE:
921                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
922                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
923                         break;
924                 }
925                 if ((err = snd_register_device(devtype, pcm->card,
926                                                pcm->device,
927                                                &snd_pcm_f_ops[cidx],
928                                                pcm, str)) < 0)
929                 {
930                         list_del(&pcm->list);
931                         up(&register_mutex);
932                         return err;
933                 }
934                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
935                         snd_pcm_timer_init(substream);
936         }
937         list_for_each(list, &snd_pcm_notify_list) {
938                 struct snd_pcm_notify *notify;
939                 notify = list_entry(list, struct snd_pcm_notify, list);
940                 notify->n_register(pcm);
941         }
942         up(&register_mutex);
943         return 0;
944 }
945
946 static int snd_pcm_dev_disconnect(struct snd_device *device)
947 {
948         struct snd_pcm *pcm = device->device_data;
949         struct list_head *list;
950         struct snd_pcm_substream *substream;
951         int cidx;
952
953         down(&register_mutex);
954         list_del_init(&pcm->list);
955         for (cidx = 0; cidx < 2; cidx++)
956                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
957                         if (substream->runtime)
958                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
959         list_for_each(list, &snd_pcm_notify_list) {
960                 struct snd_pcm_notify *notify;
961                 notify = list_entry(list, struct snd_pcm_notify, list);
962                 notify->n_disconnect(pcm);
963         }
964         up(&register_mutex);
965         return 0;
966 }
967
968 static int snd_pcm_dev_unregister(struct snd_device *device)
969 {
970         int cidx, devtype;
971         struct snd_pcm_substream *substream;
972         struct list_head *list;
973         struct snd_pcm *pcm = device->device_data;
974
975         snd_assert(pcm != NULL, return -ENXIO);
976         down(&register_mutex);
977         list_del(&pcm->list);
978         for (cidx = 0; cidx < 2; cidx++) {
979                 devtype = -1;
980                 switch (cidx) {
981                 case SNDRV_PCM_STREAM_PLAYBACK:
982                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
983                         break;
984                 case SNDRV_PCM_STREAM_CAPTURE:
985                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
986                         break;
987                 }
988                 snd_unregister_device(devtype, pcm->card, pcm->device);
989                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
990                         snd_pcm_timer_done(substream);
991         }
992         list_for_each(list, &snd_pcm_notify_list) {
993                 struct snd_pcm_notify *notify;
994                 notify = list_entry(list, struct snd_pcm_notify, list);
995                 notify->n_unregister(pcm);
996         }
997         up(&register_mutex);
998         return snd_pcm_free(pcm);
999 }
1000
1001 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1002 {
1003         struct list_head *p;
1004
1005         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1006         down(&register_mutex);
1007         if (nfree) {
1008                 list_del(&notify->list);
1009                 list_for_each(p, &snd_pcm_devices)
1010                         notify->n_unregister(list_entry(p,
1011                                                         struct snd_pcm, list));
1012         } else {
1013                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1014                 list_for_each(p, &snd_pcm_devices)
1015                         notify->n_register(list_entry(p, struct snd_pcm, list));
1016         }
1017         up(&register_mutex);
1018         return 0;
1019 }
1020
1021 #ifdef CONFIG_PROC_FS
1022 /*
1023  *  Info interface
1024  */
1025
1026 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1027                               struct snd_info_buffer *buffer)
1028 {
1029         struct list_head *p;
1030         struct snd_pcm *pcm;
1031
1032         down(&register_mutex);
1033         list_for_each(p, &snd_pcm_devices) {
1034                 pcm = list_entry(p, struct snd_pcm, list);
1035                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1036                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1037                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1038                         snd_iprintf(buffer, " : playback %i",
1039                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1040                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1041                         snd_iprintf(buffer, " : capture %i",
1042                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1043                 snd_iprintf(buffer, "\n");
1044         }
1045         up(&register_mutex);
1046 }
1047
1048 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1049
1050 static void snd_pcm_proc_init(void)
1051 {
1052         struct snd_info_entry *entry;
1053
1054         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1055                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1056                                       snd_pcm_proc_read);
1057                 if (snd_info_register(entry) < 0) {
1058                         snd_info_free_entry(entry);
1059                         entry = NULL;
1060                 }
1061         }
1062         snd_pcm_proc_entry = entry;
1063 }
1064
1065 static void snd_pcm_proc_done(void)
1066 {
1067         if (snd_pcm_proc_entry)
1068                 snd_info_unregister(snd_pcm_proc_entry);
1069 }
1070
1071 #else /* !CONFIG_PROC_FS */
1072 #define snd_pcm_proc_init()
1073 #define snd_pcm_proc_done()
1074 #endif /* CONFIG_PROC_FS */
1075
1076
1077 /*
1078  *  ENTRY functions
1079  */
1080
1081 static int __init alsa_pcm_init(void)
1082 {
1083         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1084         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1085         snd_pcm_proc_init();
1086         return 0;
1087 }
1088
1089 static void __exit alsa_pcm_exit(void)
1090 {
1091         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1092         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1093         snd_pcm_proc_done();
1094 }
1095
1096 module_init(alsa_pcm_init)
1097 module_exit(alsa_pcm_exit)
1098
1099 EXPORT_SYMBOL(snd_pcm_new);
1100 EXPORT_SYMBOL(snd_pcm_new_stream);
1101 EXPORT_SYMBOL(snd_pcm_notify);
1102 EXPORT_SYMBOL(snd_pcm_open_substream);
1103 EXPORT_SYMBOL(snd_pcm_release_substream);
1104 EXPORT_SYMBOL(snd_pcm_format_name);
1105   /* pcm_native.c */
1106 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1107 #ifdef CONFIG_PM
1108 EXPORT_SYMBOL(snd_pcm_suspend);
1109 EXPORT_SYMBOL(snd_pcm_suspend_all);
1110 #endif
1111 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1112 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1113 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1114 EXPORT_SYMBOL(snd_pcm_mmap_data);
1115 #if SNDRV_PCM_INFO_MMAP_IOMEM
1116 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1117 #endif
1118  /* pcm_misc.c */
1119 EXPORT_SYMBOL(snd_pcm_format_signed);
1120 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1121 EXPORT_SYMBOL(snd_pcm_format_linear);
1122 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1123 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1124 EXPORT_SYMBOL(snd_pcm_format_width);
1125 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1126 EXPORT_SYMBOL(snd_pcm_format_size);
1127 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1128 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1129 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1130 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);