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