4f5204175d37dc310eb3a291a78841344ff59c5f
[linux-2.6.git] / 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 <linux/mutex.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/pcm.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32
33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
35 MODULE_LICENSE("GPL");
36
37 static LIST_HEAD(snd_pcm_devices);
38 static LIST_HEAD(snd_pcm_notify_list);
39 static DEFINE_MUTEX(register_mutex);
40
41 static int snd_pcm_free(struct snd_pcm *pcm);
42 static int snd_pcm_dev_free(struct snd_device *device);
43 static int snd_pcm_dev_register(struct snd_device *device);
44 static int snd_pcm_dev_disconnect(struct snd_device *device);
45 static int snd_pcm_dev_unregister(struct snd_device *device);
46
47 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
48 {
49         struct list_head *p;
50         struct snd_pcm *pcm;
51
52         list_for_each(p, &snd_pcm_devices) {
53                 pcm = list_entry(p, struct snd_pcm, list);
54                 if (pcm->card == card && pcm->device == device)
55                         return pcm;
56         }
57         return NULL;
58 }
59
60 static int snd_pcm_control_ioctl(struct snd_card *card,
61                                  struct snd_ctl_file *control,
62                                  unsigned int cmd, unsigned long arg)
63 {
64         switch (cmd) {
65         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
66                 {
67                         int device;
68
69                         if (get_user(device, (int __user *)arg))
70                                 return -EFAULT;
71                         mutex_lock(&register_mutex);
72                         device = device < 0 ? 0 : device + 1;
73                         while (device < SNDRV_PCM_DEVICES) {
74                                 if (snd_pcm_search(card, device))
75                                         break;
76                                 device++;
77                         }
78                         if (device == SNDRV_PCM_DEVICES)
79                                 device = -1;
80                         mutex_unlock(&register_mutex);
81                         if (put_user(device, (int __user *)arg))
82                                 return -EFAULT;
83                         return 0;
84                 }
85         case SNDRV_CTL_IOCTL_PCM_INFO:
86                 {
87                         struct snd_pcm_info __user *info;
88                         unsigned int device, subdevice;
89                         int stream;
90                         struct snd_pcm *pcm;
91                         struct snd_pcm_str *pstr;
92                         struct snd_pcm_substream *substream;
93                         int err;
94
95                         info = (struct snd_pcm_info __user *)arg;
96                         if (get_user(device, &info->device))
97                                 return -EFAULT;
98                         if (get_user(stream, &info->stream))
99                                 return -EFAULT;
100                         if (stream < 0 || stream > 1)
101                                 return -EINVAL;
102                         if (get_user(subdevice, &info->subdevice))
103                                 return -EFAULT;
104                         mutex_lock(&register_mutex);
105                         pcm = snd_pcm_search(card, device);
106                         if (pcm == NULL) {
107                                 err = -ENXIO;
108                                 goto _error;
109                         }
110                         pstr = &pcm->streams[stream];
111                         if (pstr->substream_count == 0) {
112                                 err = -ENOENT;
113                                 goto _error;
114                         }
115                         if (subdevice >= pstr->substream_count) {
116                                 err = -ENXIO;
117                                 goto _error;
118                         }
119                         for (substream = pstr->substream; substream;
120                              substream = substream->next)
121                                 if (substream->number == (int)subdevice)
122                                         break;
123                         if (substream == NULL) {
124                                 err = -ENXIO;
125                                 goto _error;
126                         }
127                         err = snd_pcm_info_user(substream, info);
128                 _error:
129                         mutex_unlock(&register_mutex);
130                         return err;
131                 }
132         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
133                 {
134                         int val;
135                         
136                         if (get_user(val, (int __user *)arg))
137                                 return -EFAULT;
138                         control->prefer_pcm_subdevice = val;
139                         return 0;
140                 }
141         }
142         return -ENOIOCTLCMD;
143 }
144
145 #ifdef CONFIG_SND_VERBOSE_PROCFS
146
147 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
148 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
149 #define READY(v) [SNDRV_PCM_READY_##v] = #v
150 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
151 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
152 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
153 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
154 #define START(v) [SNDRV_PCM_START_##v] = #v
155 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
156 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
157
158 static char *snd_pcm_format_names[] = {
159         FORMAT(S8),
160         FORMAT(U8),
161         FORMAT(S16_LE),
162         FORMAT(S16_BE),
163         FORMAT(U16_LE),
164         FORMAT(U16_BE),
165         FORMAT(S24_LE),
166         FORMAT(S24_BE),
167         FORMAT(U24_LE),
168         FORMAT(U24_BE),
169         FORMAT(S32_LE),
170         FORMAT(S32_BE),
171         FORMAT(U32_LE),
172         FORMAT(U32_BE),
173         FORMAT(FLOAT_LE),
174         FORMAT(FLOAT_BE),
175         FORMAT(FLOAT64_LE),
176         FORMAT(FLOAT64_BE),
177         FORMAT(IEC958_SUBFRAME_LE),
178         FORMAT(IEC958_SUBFRAME_BE),
179         FORMAT(MU_LAW),
180         FORMAT(A_LAW),
181         FORMAT(IMA_ADPCM),
182         FORMAT(MPEG),
183         FORMAT(GSM),
184         FORMAT(SPECIAL),
185         FORMAT(S24_3LE),
186         FORMAT(S24_3BE),
187         FORMAT(U24_3LE),
188         FORMAT(U24_3BE),
189         FORMAT(S20_3LE),
190         FORMAT(S20_3BE),
191         FORMAT(U20_3LE),
192         FORMAT(U20_3BE),
193         FORMAT(S18_3LE),
194         FORMAT(S18_3BE),
195         FORMAT(U18_3LE),
196         FORMAT(U18_3BE),
197 };
198
199 static const char *snd_pcm_format_name(snd_pcm_format_t format)
200 {
201         return snd_pcm_format_names[format];
202 }
203
204 static char *snd_pcm_stream_names[] = {
205         STREAM(PLAYBACK),
206         STREAM(CAPTURE),
207 };
208
209 static char *snd_pcm_state_names[] = {
210         STATE(OPEN),
211         STATE(SETUP),
212         STATE(PREPARED),
213         STATE(RUNNING),
214         STATE(XRUN),
215         STATE(DRAINING),
216         STATE(PAUSED),
217         STATE(SUSPENDED),
218 };
219
220 static char *snd_pcm_access_names[] = {
221         ACCESS(MMAP_INTERLEAVED), 
222         ACCESS(MMAP_NONINTERLEAVED),
223         ACCESS(MMAP_COMPLEX),
224         ACCESS(RW_INTERLEAVED),
225         ACCESS(RW_NONINTERLEAVED),
226 };
227
228 static char *snd_pcm_subformat_names[] = {
229         SUBFORMAT(STD), 
230 };
231
232 static char *snd_pcm_tstamp_mode_names[] = {
233         TSTAMP(NONE),
234         TSTAMP(MMAP),
235 };
236
237 static const char *snd_pcm_stream_name(int stream)
238 {
239         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
240         return snd_pcm_stream_names[stream];
241 }
242
243 static const char *snd_pcm_access_name(snd_pcm_access_t access)
244 {
245         return snd_pcm_access_names[access];
246 }
247
248 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
249 {
250         return snd_pcm_subformat_names[subformat];
251 }
252
253 static const char *snd_pcm_tstamp_mode_name(int mode)
254 {
255         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
256         return snd_pcm_tstamp_mode_names[mode];
257 }
258
259 static const char *snd_pcm_state_name(snd_pcm_state_t state)
260 {
261         return snd_pcm_state_names[state];
262 }
263
264 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
265 #include <linux/soundcard.h>
266
267 static const char *snd_pcm_oss_format_name(int format)
268 {
269         switch (format) {
270         case AFMT_MU_LAW:
271                 return "MU_LAW";
272         case AFMT_A_LAW:
273                 return "A_LAW";
274         case AFMT_IMA_ADPCM:
275                 return "IMA_ADPCM";
276         case AFMT_U8:
277                 return "U8";
278         case AFMT_S16_LE:
279                 return "S16_LE";
280         case AFMT_S16_BE:
281                 return "S16_BE";
282         case AFMT_S8:
283                 return "S8";
284         case AFMT_U16_LE:
285                 return "U16_LE";
286         case AFMT_U16_BE:
287                 return "U16_BE";
288         case AFMT_MPEG:
289                 return "MPEG";
290         default:
291                 return "unknown";
292         }
293 }
294 #endif
295
296 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
297                                    struct snd_info_buffer *buffer)
298 {
299         struct snd_pcm_info *info;
300         int err;
301
302         if (! substream)
303                 return;
304
305         info = kmalloc(sizeof(*info), GFP_KERNEL);
306         if (! info) {
307                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
308                 return;
309         }
310
311         err = snd_pcm_info(substream, info);
312         if (err < 0) {
313                 snd_iprintf(buffer, "error %d\n", err);
314                 kfree(info);
315                 return;
316         }
317         snd_iprintf(buffer, "card: %d\n", info->card);
318         snd_iprintf(buffer, "device: %d\n", info->device);
319         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
320         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
321         snd_iprintf(buffer, "id: %s\n", info->id);
322         snd_iprintf(buffer, "name: %s\n", info->name);
323         snd_iprintf(buffer, "subname: %s\n", info->subname);
324         snd_iprintf(buffer, "class: %d\n", info->dev_class);
325         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
326         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
327         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
328         kfree(info);
329 }
330
331 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
332                                           struct snd_info_buffer *buffer)
333 {
334         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
335                                buffer);
336 }
337
338 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
339                                              struct snd_info_buffer *buffer)
340 {
341         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
342                                buffer);
343 }
344
345 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
346                                                   struct snd_info_buffer *buffer)
347 {
348         struct snd_pcm_substream *substream = entry->private_data;
349         struct snd_pcm_runtime *runtime = substream->runtime;
350         if (!runtime) {
351                 snd_iprintf(buffer, "closed\n");
352                 return;
353         }
354         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
355                 snd_iprintf(buffer, "no setup\n");
356                 return;
357         }
358         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
359         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
360         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
361         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
362         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
363         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
364         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
365         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
366 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
367         if (substream->oss.oss) {
368                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
369                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
370                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
371                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
372                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
373                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
374         }
375 #endif
376 }
377
378 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
379                                                   struct snd_info_buffer *buffer)
380 {
381         struct snd_pcm_substream *substream = entry->private_data;
382         struct snd_pcm_runtime *runtime = substream->runtime;
383         if (!runtime) {
384                 snd_iprintf(buffer, "closed\n");
385                 return;
386         }
387         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
388                 snd_iprintf(buffer, "no setup\n");
389                 return;
390         }
391         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
392         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
393         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
394         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
395         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
396         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
397         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
398         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
399         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
400         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
401 }
402
403 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
404                                                struct snd_info_buffer *buffer)
405 {
406         struct snd_pcm_substream *substream = entry->private_data;
407         struct snd_pcm_runtime *runtime = substream->runtime;
408         struct snd_pcm_status status;
409         int err;
410         if (!runtime) {
411                 snd_iprintf(buffer, "closed\n");
412                 return;
413         }
414         memset(&status, 0, sizeof(status));
415         err = snd_pcm_status(substream, &status);
416         if (err < 0) {
417                 snd_iprintf(buffer, "error %d\n", err);
418                 return;
419         }
420         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
421         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
422                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
423         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
424                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
425         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
426         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
427         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
428         snd_iprintf(buffer, "-----\n");
429         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
430         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
431 }
432
433 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
434 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
435                                     struct snd_info_buffer *buffer)
436 {
437         struct snd_pcm_str *pstr = entry->private_data;
438         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
439 }
440
441 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
442                                      struct snd_info_buffer *buffer)
443 {
444         struct snd_pcm_str *pstr = entry->private_data;
445         char line[64];
446         if (!snd_info_get_line(buffer, line, sizeof(line)))
447                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
448 }
449 #endif
450
451 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
452 {
453         struct snd_pcm *pcm = pstr->pcm;
454         struct snd_info_entry *entry;
455         char name[16];
456
457         sprintf(name, "pcm%i%c", pcm->device, 
458                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
459         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
460                 return -ENOMEM;
461         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
462         if (snd_info_register(entry) < 0) {
463                 snd_info_free_entry(entry);
464                 return -ENOMEM;
465         }
466         pstr->proc_root = entry;
467
468         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
469                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
470                 if (snd_info_register(entry) < 0) {
471                         snd_info_free_entry(entry);
472                         entry = NULL;
473                 }
474         }
475         pstr->proc_info_entry = entry;
476
477 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
478         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
479                                                 pstr->proc_root)) != NULL) {
480                 entry->c.text.read = snd_pcm_xrun_debug_read;
481                 entry->c.text.write = snd_pcm_xrun_debug_write;
482                 entry->mode |= S_IWUSR;
483                 entry->private_data = pstr;
484                 if (snd_info_register(entry) < 0) {
485                         snd_info_free_entry(entry);
486                         entry = NULL;
487                 }
488         }
489         pstr->proc_xrun_debug_entry = entry;
490 #endif
491         return 0;
492 }
493
494 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
495 {
496 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
497         if (pstr->proc_xrun_debug_entry) {
498                 snd_info_unregister(pstr->proc_xrun_debug_entry);
499                 pstr->proc_xrun_debug_entry = NULL;
500         }
501 #endif
502         if (pstr->proc_info_entry) {
503                 snd_info_unregister(pstr->proc_info_entry);
504                 pstr->proc_info_entry = NULL;
505         }
506         if (pstr->proc_root) {
507                 snd_info_unregister(pstr->proc_root);
508                 pstr->proc_root = NULL;
509         }
510         return 0;
511 }
512
513 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
514 {
515         struct snd_info_entry *entry;
516         struct snd_card *card;
517         char name[16];
518
519         card = substream->pcm->card;
520
521         sprintf(name, "sub%i", substream->number);
522         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
523                 return -ENOMEM;
524         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525         if (snd_info_register(entry) < 0) {
526                 snd_info_free_entry(entry);
527                 return -ENOMEM;
528         }
529         substream->proc_root = entry;
530
531         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
532                 snd_info_set_text_ops(entry, substream,
533                                       snd_pcm_substream_proc_info_read);
534                 if (snd_info_register(entry) < 0) {
535                         snd_info_free_entry(entry);
536                         entry = NULL;
537                 }
538         }
539         substream->proc_info_entry = entry;
540
541         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
542                 snd_info_set_text_ops(entry, substream,
543                                       snd_pcm_substream_proc_hw_params_read);
544                 if (snd_info_register(entry) < 0) {
545                         snd_info_free_entry(entry);
546                         entry = NULL;
547                 }
548         }
549         substream->proc_hw_params_entry = entry;
550
551         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
552                 snd_info_set_text_ops(entry, substream,
553                                       snd_pcm_substream_proc_sw_params_read);
554                 if (snd_info_register(entry) < 0) {
555                         snd_info_free_entry(entry);
556                         entry = NULL;
557                 }
558         }
559         substream->proc_sw_params_entry = entry;
560
561         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
562                 snd_info_set_text_ops(entry, substream,
563                                       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_SND_VERBOSE_PROCFS */
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_SND_VERBOSE_PROCFS */
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         mutex_init(&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 EXPORT_SYMBOL(snd_pcm_new_stream);
671
672 /**
673  * snd_pcm_new - create a new PCM instance
674  * @card: the card instance
675  * @id: the id string
676  * @device: the device index (zero based)
677  * @playback_count: the number of substreams for playback
678  * @capture_count: the number of substreams for capture
679  * @rpcm: the pointer to store the new pcm instance
680  *
681  * Creates a new PCM instance.
682  *
683  * The pcm operators have to be set afterwards to the new instance
684  * via snd_pcm_set_ops().
685  *
686  * Returns zero if successful, or a negative error code on failure.
687  */
688 int snd_pcm_new(struct snd_card *card, char *id, int device,
689                 int playback_count, int capture_count,
690                 struct snd_pcm ** rpcm)
691 {
692         struct snd_pcm *pcm;
693         int err;
694         static struct snd_device_ops ops = {
695                 .dev_free = snd_pcm_dev_free,
696                 .dev_register = snd_pcm_dev_register,
697                 .dev_disconnect = snd_pcm_dev_disconnect,
698                 .dev_unregister = snd_pcm_dev_unregister
699         };
700
701         snd_assert(rpcm != NULL, return -EINVAL);
702         *rpcm = NULL;
703         snd_assert(card != NULL, return -ENXIO);
704         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
705         if (pcm == NULL) {
706                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
707                 return -ENOMEM;
708         }
709         pcm->card = card;
710         pcm->device = device;
711         if (id)
712                 strlcpy(pcm->id, id, sizeof(pcm->id));
713         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
714                 snd_pcm_free(pcm);
715                 return err;
716         }
717         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
718                 snd_pcm_free(pcm);
719                 return err;
720         }
721         mutex_init(&pcm->open_mutex);
722         init_waitqueue_head(&pcm->open_wait);
723         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
724                 snd_pcm_free(pcm);
725                 return err;
726         }
727         *rpcm = pcm;
728         return 0;
729 }
730
731 EXPORT_SYMBOL(snd_pcm_new);
732
733 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
734 {
735         struct snd_pcm_substream *substream, *substream_next;
736 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
737         struct snd_pcm_oss_setup *setup, *setupn;
738 #endif
739         substream = pstr->substream;
740         while (substream) {
741                 substream_next = substream->next;
742                 snd_pcm_substream_proc_done(substream);
743                 kfree(substream);
744                 substream = substream_next;
745         }
746         snd_pcm_stream_proc_done(pstr);
747 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
748         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
749                 setupn = setup->next;
750                 kfree(setup->task_name);
751                 kfree(setup);
752         }
753 #endif
754 }
755
756 static int snd_pcm_free(struct snd_pcm *pcm)
757 {
758         snd_assert(pcm != NULL, return -ENXIO);
759         if (pcm->private_free)
760                 pcm->private_free(pcm);
761         snd_pcm_lib_preallocate_free_for_all(pcm);
762         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
763         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
764         kfree(pcm);
765         return 0;
766 }
767
768 static int snd_pcm_dev_free(struct snd_device *device)
769 {
770         struct snd_pcm *pcm = device->device_data;
771         return snd_pcm_free(pcm);
772 }
773
774 static void snd_pcm_tick_timer_func(unsigned long data)
775 {
776         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
777         snd_pcm_tick_elapsed(substream);
778 }
779
780 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
781                              struct file *file,
782                              struct snd_pcm_substream **rsubstream)
783 {
784         struct snd_pcm_str * pstr;
785         struct snd_pcm_substream *substream;
786         struct snd_pcm_runtime *runtime;
787         struct snd_ctl_file *kctl;
788         struct snd_card *card;
789         struct list_head *list;
790         int prefer_subdevice = -1;
791         size_t size;
792
793         snd_assert(rsubstream != NULL, return -EINVAL);
794         *rsubstream = NULL;
795         snd_assert(pcm != NULL, return -ENXIO);
796         pstr = &pcm->streams[stream];
797         if (pstr->substream == NULL || pstr->substream_count == 0)
798                 return -ENODEV;
799
800         card = pcm->card;
801         down_read(&card->controls_rwsem);
802         list_for_each(list, &card->ctl_files) {
803                 kctl = snd_ctl_file(list);
804                 if (kctl->pid == current->pid) {
805                         prefer_subdevice = kctl->prefer_pcm_subdevice;
806                         break;
807                 }
808         }
809         up_read(&card->controls_rwsem);
810
811         switch (stream) {
812         case SNDRV_PCM_STREAM_PLAYBACK:
813                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
814                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
815                                 if (SUBSTREAM_BUSY(substream))
816                                         return -EAGAIN;
817                         }
818                 }
819                 break;
820         case SNDRV_PCM_STREAM_CAPTURE:
821                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
822                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
823                                 if (SUBSTREAM_BUSY(substream))
824                                         return -EAGAIN;
825                         }
826                 }
827                 break;
828         default:
829                 return -EINVAL;
830         }
831
832         if (prefer_subdevice >= 0) {
833                 for (substream = pstr->substream; substream; substream = substream->next)
834                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
835                                 goto __ok;
836         }
837         for (substream = pstr->substream; substream; substream = substream->next)
838                 if (!SUBSTREAM_BUSY(substream))
839                         break;
840       __ok:
841         if (substream == NULL)
842                 return -EAGAIN;
843
844         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
845         if (runtime == NULL)
846                 return -ENOMEM;
847
848         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
849         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
850         if (runtime->status == NULL) {
851                 kfree(runtime);
852                 return -ENOMEM;
853         }
854         memset((void*)runtime->status, 0, size);
855
856         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
857         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
858         if (runtime->control == NULL) {
859                 snd_free_pages((void*)runtime->status,
860                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
861                 kfree(runtime);
862                 return -ENOMEM;
863         }
864         memset((void*)runtime->control, 0, size);
865
866         init_waitqueue_head(&runtime->sleep);
867         atomic_set(&runtime->mmap_count, 0);
868         init_timer(&runtime->tick_timer);
869         runtime->tick_timer.function = snd_pcm_tick_timer_func;
870         runtime->tick_timer.data = (unsigned long) substream;
871
872         runtime->status->state = SNDRV_PCM_STATE_OPEN;
873
874         substream->runtime = runtime;
875         substream->private_data = pcm->private_data;
876         substream->ffile = file;
877         pstr->substream_opened++;
878         *rsubstream = substream;
879         return 0;
880 }
881
882 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
883 {
884         struct snd_pcm_runtime *runtime;
885         substream->file = NULL;
886         runtime = substream->runtime;
887         snd_assert(runtime != NULL, return);
888         if (runtime->private_free != NULL)
889                 runtime->private_free(runtime);
890         snd_free_pages((void*)runtime->status,
891                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
892         snd_free_pages((void*)runtime->control,
893                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
894         kfree(runtime->hw_constraints.rules);
895         kfree(runtime);
896         substream->runtime = NULL;
897         substream->pstr->substream_opened--;
898 }
899
900 static int snd_pcm_dev_register(struct snd_device *device)
901 {
902         int cidx, err;
903         struct snd_pcm_substream *substream;
904         struct list_head *list;
905         char str[16];
906         struct snd_pcm *pcm = device->device_data;
907
908         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
909         mutex_lock(&register_mutex);
910         if (snd_pcm_search(pcm->card, pcm->device)) {
911                 mutex_unlock(&register_mutex);
912                 return -EBUSY;
913         }
914         list_add_tail(&pcm->list, &snd_pcm_devices);
915         for (cidx = 0; cidx < 2; cidx++) {
916                 int devtype = -1;
917                 if (pcm->streams[cidx].substream == NULL)
918                         continue;
919                 switch (cidx) {
920                 case SNDRV_PCM_STREAM_PLAYBACK:
921                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
922                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
923                         break;
924                 case SNDRV_PCM_STREAM_CAPTURE:
925                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
926                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
927                         break;
928                 }
929                 if ((err = snd_register_device(devtype, pcm->card,
930                                                pcm->device,
931                                                &snd_pcm_f_ops[cidx],
932                                                pcm, str)) < 0)
933                 {
934                         list_del(&pcm->list);
935                         mutex_unlock(&register_mutex);
936                         return err;
937                 }
938                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
939                         snd_pcm_timer_init(substream);
940         }
941         list_for_each(list, &snd_pcm_notify_list) {
942                 struct snd_pcm_notify *notify;
943                 notify = list_entry(list, struct snd_pcm_notify, list);
944                 notify->n_register(pcm);
945         }
946         mutex_unlock(&register_mutex);
947         return 0;
948 }
949
950 static int snd_pcm_dev_disconnect(struct snd_device *device)
951 {
952         struct snd_pcm *pcm = device->device_data;
953         struct list_head *list;
954         struct snd_pcm_substream *substream;
955         int cidx;
956
957         mutex_lock(&register_mutex);
958         list_del_init(&pcm->list);
959         for (cidx = 0; cidx < 2; cidx++)
960                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
961                         if (substream->runtime)
962                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
963         list_for_each(list, &snd_pcm_notify_list) {
964                 struct snd_pcm_notify *notify;
965                 notify = list_entry(list, struct snd_pcm_notify, list);
966                 notify->n_disconnect(pcm);
967         }
968         mutex_unlock(&register_mutex);
969         return 0;
970 }
971
972 static int snd_pcm_dev_unregister(struct snd_device *device)
973 {
974         int cidx, devtype;
975         struct snd_pcm_substream *substream;
976         struct list_head *list;
977         struct snd_pcm *pcm = device->device_data;
978
979         snd_assert(pcm != NULL, return -ENXIO);
980         mutex_lock(&register_mutex);
981         list_del(&pcm->list);
982         for (cidx = 0; cidx < 2; cidx++) {
983                 devtype = -1;
984                 switch (cidx) {
985                 case SNDRV_PCM_STREAM_PLAYBACK:
986                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
987                         break;
988                 case SNDRV_PCM_STREAM_CAPTURE:
989                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
990                         break;
991                 }
992                 snd_unregister_device(devtype, pcm->card, pcm->device);
993                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
994                         snd_pcm_timer_done(substream);
995         }
996         list_for_each(list, &snd_pcm_notify_list) {
997                 struct snd_pcm_notify *notify;
998                 notify = list_entry(list, struct snd_pcm_notify, list);
999                 notify->n_unregister(pcm);
1000         }
1001         mutex_unlock(&register_mutex);
1002         return snd_pcm_free(pcm);
1003 }
1004
1005 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1006 {
1007         struct list_head *p;
1008
1009         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1010         mutex_lock(&register_mutex);
1011         if (nfree) {
1012                 list_del(&notify->list);
1013                 list_for_each(p, &snd_pcm_devices)
1014                         notify->n_unregister(list_entry(p,
1015                                                         struct snd_pcm, list));
1016         } else {
1017                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1018                 list_for_each(p, &snd_pcm_devices)
1019                         notify->n_register(list_entry(p, struct snd_pcm, list));
1020         }
1021         mutex_unlock(&register_mutex);
1022         return 0;
1023 }
1024
1025 EXPORT_SYMBOL(snd_pcm_notify);
1026
1027 #ifdef CONFIG_PROC_FS
1028 /*
1029  *  Info interface
1030  */
1031
1032 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1033                               struct snd_info_buffer *buffer)
1034 {
1035         struct list_head *p;
1036         struct snd_pcm *pcm;
1037
1038         mutex_lock(&register_mutex);
1039         list_for_each(p, &snd_pcm_devices) {
1040                 pcm = list_entry(p, struct snd_pcm, list);
1041                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1042                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1043                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1044                         snd_iprintf(buffer, " : playback %i",
1045                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1046                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1047                         snd_iprintf(buffer, " : capture %i",
1048                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1049                 snd_iprintf(buffer, "\n");
1050         }
1051         mutex_unlock(&register_mutex);
1052 }
1053
1054 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1055
1056 static void snd_pcm_proc_init(void)
1057 {
1058         struct snd_info_entry *entry;
1059
1060         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1061                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1062                 if (snd_info_register(entry) < 0) {
1063                         snd_info_free_entry(entry);
1064                         entry = NULL;
1065                 }
1066         }
1067         snd_pcm_proc_entry = entry;
1068 }
1069
1070 static void snd_pcm_proc_done(void)
1071 {
1072         if (snd_pcm_proc_entry)
1073                 snd_info_unregister(snd_pcm_proc_entry);
1074 }
1075
1076 #else /* !CONFIG_PROC_FS */
1077 #define snd_pcm_proc_init()
1078 #define snd_pcm_proc_done()
1079 #endif /* CONFIG_PROC_FS */
1080
1081
1082 /*
1083  *  ENTRY functions
1084  */
1085
1086 static int __init alsa_pcm_init(void)
1087 {
1088         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1089         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1090         snd_pcm_proc_init();
1091         return 0;
1092 }
1093
1094 static void __exit alsa_pcm_exit(void)
1095 {
1096         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1097         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1098         snd_pcm_proc_done();
1099 }
1100
1101 module_init(alsa_pcm_init)
1102 module_exit(alsa_pcm_exit)