ASoC: Set correct name for WM8753 rec mixer output
[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_search(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_control_ioctl(struct snd_card *card,
57                                  struct snd_ctl_file *control,
58                                  unsigned int cmd, unsigned long arg)
59 {
60         switch (cmd) {
61         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
62                 {
63                         int device;
64
65                         if (get_user(device, (int __user *)arg))
66                                 return -EFAULT;
67                         mutex_lock(&register_mutex);
68                         device = device < 0 ? 0 : device + 1;
69                         while (device < SNDRV_PCM_DEVICES) {
70                                 if (snd_pcm_search(card, device))
71                                         break;
72                                 device++;
73                         }
74                         if (device == SNDRV_PCM_DEVICES)
75                                 device = -1;
76                         mutex_unlock(&register_mutex);
77                         if (put_user(device, (int __user *)arg))
78                                 return -EFAULT;
79                         return 0;
80                 }
81         case SNDRV_CTL_IOCTL_PCM_INFO:
82                 {
83                         struct snd_pcm_info __user *info;
84                         unsigned int device, subdevice;
85                         int stream;
86                         struct snd_pcm *pcm;
87                         struct snd_pcm_str *pstr;
88                         struct snd_pcm_substream *substream;
89                         int err;
90
91                         info = (struct snd_pcm_info __user *)arg;
92                         if (get_user(device, &info->device))
93                                 return -EFAULT;
94                         if (get_user(stream, &info->stream))
95                                 return -EFAULT;
96                         if (stream < 0 || stream > 1)
97                                 return -EINVAL;
98                         if (get_user(subdevice, &info->subdevice))
99                                 return -EFAULT;
100                         mutex_lock(&register_mutex);
101                         pcm = snd_pcm_search(card, device);
102                         if (pcm == NULL) {
103                                 err = -ENXIO;
104                                 goto _error;
105                         }
106                         pstr = &pcm->streams[stream];
107                         if (pstr->substream_count == 0) {
108                                 err = -ENOENT;
109                                 goto _error;
110                         }
111                         if (subdevice >= pstr->substream_count) {
112                                 err = -ENXIO;
113                                 goto _error;
114                         }
115                         for (substream = pstr->substream; substream;
116                              substream = substream->next)
117                                 if (substream->number == (int)subdevice)
118                                         break;
119                         if (substream == NULL) {
120                                 err = -ENXIO;
121                                 goto _error;
122                         }
123                         err = snd_pcm_info_user(substream, info);
124                 _error:
125                         mutex_unlock(&register_mutex);
126                         return err;
127                 }
128         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
129                 {
130                         int val;
131                         
132                         if (get_user(val, (int __user *)arg))
133                                 return -EFAULT;
134                         control->prefer_pcm_subdevice = val;
135                         return 0;
136                 }
137         }
138         return -ENOIOCTLCMD;
139 }
140
141 #ifdef CONFIG_SND_VERBOSE_PROCFS
142
143 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
144 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
145 #define READY(v) [SNDRV_PCM_READY_##v] = #v
146 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
147 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
148 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
149 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
150 #define START(v) [SNDRV_PCM_START_##v] = #v
151 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
152 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
153
154 static char *snd_pcm_format_names[] = {
155         FORMAT(S8),
156         FORMAT(U8),
157         FORMAT(S16_LE),
158         FORMAT(S16_BE),
159         FORMAT(U16_LE),
160         FORMAT(U16_BE),
161         FORMAT(S24_LE),
162         FORMAT(S24_BE),
163         FORMAT(U24_LE),
164         FORMAT(U24_BE),
165         FORMAT(S32_LE),
166         FORMAT(S32_BE),
167         FORMAT(U32_LE),
168         FORMAT(U32_BE),
169         FORMAT(FLOAT_LE),
170         FORMAT(FLOAT_BE),
171         FORMAT(FLOAT64_LE),
172         FORMAT(FLOAT64_BE),
173         FORMAT(IEC958_SUBFRAME_LE),
174         FORMAT(IEC958_SUBFRAME_BE),
175         FORMAT(MU_LAW),
176         FORMAT(A_LAW),
177         FORMAT(IMA_ADPCM),
178         FORMAT(MPEG),
179         FORMAT(GSM),
180         FORMAT(SPECIAL),
181         FORMAT(S24_3LE),
182         FORMAT(S24_3BE),
183         FORMAT(U24_3LE),
184         FORMAT(U24_3BE),
185         FORMAT(S20_3LE),
186         FORMAT(S20_3BE),
187         FORMAT(U20_3LE),
188         FORMAT(U20_3BE),
189         FORMAT(S18_3LE),
190         FORMAT(S18_3BE),
191         FORMAT(U18_3LE),
192         FORMAT(U18_3BE),
193 };
194
195 static const char *snd_pcm_format_name(snd_pcm_format_t format)
196 {
197         return snd_pcm_format_names[format];
198 }
199
200 static char *snd_pcm_stream_names[] = {
201         STREAM(PLAYBACK),
202         STREAM(CAPTURE),
203 };
204
205 static char *snd_pcm_state_names[] = {
206         STATE(OPEN),
207         STATE(SETUP),
208         STATE(PREPARED),
209         STATE(RUNNING),
210         STATE(XRUN),
211         STATE(DRAINING),
212         STATE(PAUSED),
213         STATE(SUSPENDED),
214 };
215
216 static char *snd_pcm_access_names[] = {
217         ACCESS(MMAP_INTERLEAVED), 
218         ACCESS(MMAP_NONINTERLEAVED),
219         ACCESS(MMAP_COMPLEX),
220         ACCESS(RW_INTERLEAVED),
221         ACCESS(RW_NONINTERLEAVED),
222 };
223
224 static char *snd_pcm_subformat_names[] = {
225         SUBFORMAT(STD), 
226 };
227
228 static char *snd_pcm_tstamp_mode_names[] = {
229         TSTAMP(NONE),
230         TSTAMP(ENABLE),
231 };
232
233 static const char *snd_pcm_stream_name(int stream)
234 {
235         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
236         return snd_pcm_stream_names[stream];
237 }
238
239 static const char *snd_pcm_access_name(snd_pcm_access_t access)
240 {
241         return snd_pcm_access_names[access];
242 }
243
244 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
245 {
246         return snd_pcm_subformat_names[subformat];
247 }
248
249 static const char *snd_pcm_tstamp_mode_name(int mode)
250 {
251         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
252         return snd_pcm_tstamp_mode_names[mode];
253 }
254
255 static const char *snd_pcm_state_name(snd_pcm_state_t state)
256 {
257         return snd_pcm_state_names[state];
258 }
259
260 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
261 #include <linux/soundcard.h>
262
263 static const char *snd_pcm_oss_format_name(int format)
264 {
265         switch (format) {
266         case AFMT_MU_LAW:
267                 return "MU_LAW";
268         case AFMT_A_LAW:
269                 return "A_LAW";
270         case AFMT_IMA_ADPCM:
271                 return "IMA_ADPCM";
272         case AFMT_U8:
273                 return "U8";
274         case AFMT_S16_LE:
275                 return "S16_LE";
276         case AFMT_S16_BE:
277                 return "S16_BE";
278         case AFMT_S8:
279                 return "S8";
280         case AFMT_U16_LE:
281                 return "U16_LE";
282         case AFMT_U16_BE:
283                 return "U16_BE";
284         case AFMT_MPEG:
285                 return "MPEG";
286         default:
287                 return "unknown";
288         }
289 }
290 #endif
291
292 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
293                                    struct snd_info_buffer *buffer)
294 {
295         struct snd_pcm_info *info;
296         int err;
297
298         if (! substream)
299                 return;
300
301         info = kmalloc(sizeof(*info), GFP_KERNEL);
302         if (! info) {
303                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
304                 return;
305         }
306
307         err = snd_pcm_info(substream, info);
308         if (err < 0) {
309                 snd_iprintf(buffer, "error %d\n", err);
310                 kfree(info);
311                 return;
312         }
313         snd_iprintf(buffer, "card: %d\n", info->card);
314         snd_iprintf(buffer, "device: %d\n", info->device);
315         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
316         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
317         snd_iprintf(buffer, "id: %s\n", info->id);
318         snd_iprintf(buffer, "name: %s\n", info->name);
319         snd_iprintf(buffer, "subname: %s\n", info->subname);
320         snd_iprintf(buffer, "class: %d\n", info->dev_class);
321         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
322         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
323         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
324         kfree(info);
325 }
326
327 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
328                                           struct snd_info_buffer *buffer)
329 {
330         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
331                                buffer);
332 }
333
334 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
335                                              struct snd_info_buffer *buffer)
336 {
337         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
338                                buffer);
339 }
340
341 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
342                                                   struct snd_info_buffer *buffer)
343 {
344         struct snd_pcm_substream *substream = entry->private_data;
345         struct snd_pcm_runtime *runtime = substream->runtime;
346         if (!runtime) {
347                 snd_iprintf(buffer, "closed\n");
348                 return;
349         }
350         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
351                 snd_iprintf(buffer, "no setup\n");
352                 return;
353         }
354         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
355         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
356         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
357         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
358         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
359         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
360         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
361 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
362         if (substream->oss.oss) {
363                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
364                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
365                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
366                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
367                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
368                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
369         }
370 #endif
371 }
372
373 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
374                                                   struct snd_info_buffer *buffer)
375 {
376         struct snd_pcm_substream *substream = entry->private_data;
377         struct snd_pcm_runtime *runtime = substream->runtime;
378         if (!runtime) {
379                 snd_iprintf(buffer, "closed\n");
380                 return;
381         }
382         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
383                 snd_iprintf(buffer, "no setup\n");
384                 return;
385         }
386         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
387         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
388         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
389         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
390         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
391         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
392         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
393         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
394 }
395
396 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
397                                                struct snd_info_buffer *buffer)
398 {
399         struct snd_pcm_substream *substream = entry->private_data;
400         struct snd_pcm_runtime *runtime = substream->runtime;
401         struct snd_pcm_status status;
402         int err;
403         if (!runtime) {
404                 snd_iprintf(buffer, "closed\n");
405                 return;
406         }
407         memset(&status, 0, sizeof(status));
408         err = snd_pcm_status(substream, &status);
409         if (err < 0) {
410                 snd_iprintf(buffer, "error %d\n", err);
411                 return;
412         }
413         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
414         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
415                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
416         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
417                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
418         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
419         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
420         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
421         snd_iprintf(buffer, "-----\n");
422         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
423         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
424 }
425
426 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
427 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
428                                     struct snd_info_buffer *buffer)
429 {
430         struct snd_pcm_str *pstr = entry->private_data;
431         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
432 }
433
434 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
435                                      struct snd_info_buffer *buffer)
436 {
437         struct snd_pcm_str *pstr = entry->private_data;
438         char line[64];
439         if (!snd_info_get_line(buffer, line, sizeof(line)))
440                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
441 }
442 #endif
443
444 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
445 {
446         struct snd_pcm *pcm = pstr->pcm;
447         struct snd_info_entry *entry;
448         char name[16];
449
450         sprintf(name, "pcm%i%c", pcm->device, 
451                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
452         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
453                 return -ENOMEM;
454         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
455         if (snd_info_register(entry) < 0) {
456                 snd_info_free_entry(entry);
457                 return -ENOMEM;
458         }
459         pstr->proc_root = entry;
460
461         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
462                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
463                 if (snd_info_register(entry) < 0) {
464                         snd_info_free_entry(entry);
465                         entry = NULL;
466                 }
467         }
468         pstr->proc_info_entry = entry;
469
470 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
471         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
472                                                 pstr->proc_root)) != NULL) {
473                 entry->c.text.read = snd_pcm_xrun_debug_read;
474                 entry->c.text.write = snd_pcm_xrun_debug_write;
475                 entry->mode |= S_IWUSR;
476                 entry->private_data = pstr;
477                 if (snd_info_register(entry) < 0) {
478                         snd_info_free_entry(entry);
479                         entry = NULL;
480                 }
481         }
482         pstr->proc_xrun_debug_entry = entry;
483 #endif
484         return 0;
485 }
486
487 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
488 {
489 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
490         snd_info_free_entry(pstr->proc_xrun_debug_entry);
491         pstr->proc_xrun_debug_entry = NULL;
492 #endif
493         snd_info_free_entry(pstr->proc_info_entry);
494         pstr->proc_info_entry = NULL;
495         snd_info_free_entry(pstr->proc_root);
496         pstr->proc_root = NULL;
497         return 0;
498 }
499
500 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
501 {
502         struct snd_info_entry *entry;
503         struct snd_card *card;
504         char name[16];
505
506         card = substream->pcm->card;
507
508         sprintf(name, "sub%i", substream->number);
509         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
510                 return -ENOMEM;
511         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
512         if (snd_info_register(entry) < 0) {
513                 snd_info_free_entry(entry);
514                 return -ENOMEM;
515         }
516         substream->proc_root = entry;
517
518         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
519                 snd_info_set_text_ops(entry, substream,
520                                       snd_pcm_substream_proc_info_read);
521                 if (snd_info_register(entry) < 0) {
522                         snd_info_free_entry(entry);
523                         entry = NULL;
524                 }
525         }
526         substream->proc_info_entry = entry;
527
528         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
529                 snd_info_set_text_ops(entry, substream,
530                                       snd_pcm_substream_proc_hw_params_read);
531                 if (snd_info_register(entry) < 0) {
532                         snd_info_free_entry(entry);
533                         entry = NULL;
534                 }
535         }
536         substream->proc_hw_params_entry = entry;
537
538         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
539                 snd_info_set_text_ops(entry, substream,
540                                       snd_pcm_substream_proc_sw_params_read);
541                 if (snd_info_register(entry) < 0) {
542                         snd_info_free_entry(entry);
543                         entry = NULL;
544                 }
545         }
546         substream->proc_sw_params_entry = entry;
547
548         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
549                 snd_info_set_text_ops(entry, substream,
550                                       snd_pcm_substream_proc_status_read);
551                 if (snd_info_register(entry) < 0) {
552                         snd_info_free_entry(entry);
553                         entry = NULL;
554                 }
555         }
556         substream->proc_status_entry = entry;
557
558         return 0;
559 }
560
561 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
562 {
563         snd_info_free_entry(substream->proc_info_entry);
564         substream->proc_info_entry = NULL;
565         snd_info_free_entry(substream->proc_hw_params_entry);
566         substream->proc_hw_params_entry = NULL;
567         snd_info_free_entry(substream->proc_sw_params_entry);
568         substream->proc_sw_params_entry = NULL;
569         snd_info_free_entry(substream->proc_status_entry);
570         substream->proc_status_entry = NULL;
571         snd_info_free_entry(substream->proc_root);
572         substream->proc_root = NULL;
573         return 0;
574 }
575 #else /* !CONFIG_SND_VERBOSE_PROCFS */
576 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
577 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
578 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
579 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
580 #endif /* CONFIG_SND_VERBOSE_PROCFS */
581
582 /**
583  * snd_pcm_new_stream - create a new PCM stream
584  * @pcm: the pcm instance
585  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
586  * @substream_count: the number of substreams
587  *
588  * Creates a new stream for the pcm.
589  * The corresponding stream on the pcm must have been empty before
590  * calling this, i.e. zero must be given to the argument of
591  * snd_pcm_new().
592  *
593  * Returns zero if successful, or a negative error code on failure.
594  */
595 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
596 {
597         int idx, err;
598         struct snd_pcm_str *pstr = &pcm->streams[stream];
599         struct snd_pcm_substream *substream, *prev;
600
601 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
602         mutex_init(&pstr->oss.setup_mutex);
603 #endif
604         pstr->stream = stream;
605         pstr->pcm = pcm;
606         pstr->substream_count = substream_count;
607         if (substream_count > 0) {
608                 err = snd_pcm_stream_proc_init(pstr);
609                 if (err < 0) {
610                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
611                         return err;
612                 }
613         }
614         prev = NULL;
615         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
616                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
617                 if (substream == NULL) {
618                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
619                         return -ENOMEM;
620                 }
621                 substream->pcm = pcm;
622                 substream->pstr = pstr;
623                 substream->number = idx;
624                 substream->stream = stream;
625                 sprintf(substream->name, "subdevice #%i", idx);
626                 snprintf(substream->latency_id, sizeof(substream->latency_id),
627                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
628                          (stream ? 'c' : 'p'), idx);
629                 substream->buffer_bytes_max = UINT_MAX;
630                 if (prev == NULL)
631                         pstr->substream = substream;
632                 else
633                         prev->next = substream;
634                 err = snd_pcm_substream_proc_init(substream);
635                 if (err < 0) {
636                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
637                         if (prev == NULL)
638                                 pstr->substream = NULL;
639                         else
640                                 prev->next = NULL;
641                         kfree(substream);
642                         return err;
643                 }
644                 substream->group = &substream->self_group;
645                 spin_lock_init(&substream->self_group.lock);
646                 INIT_LIST_HEAD(&substream->self_group.substreams);
647                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
648                 spin_lock_init(&substream->timer_lock);
649                 atomic_set(&substream->mmap_count, 0);
650                 prev = substream;
651         }
652         return 0;
653 }                               
654
655 EXPORT_SYMBOL(snd_pcm_new_stream);
656
657 /**
658  * snd_pcm_new - create a new PCM instance
659  * @card: the card instance
660  * @id: the id string
661  * @device: the device index (zero based)
662  * @playback_count: the number of substreams for playback
663  * @capture_count: the number of substreams for capture
664  * @rpcm: the pointer to store the new pcm instance
665  *
666  * Creates a new PCM instance.
667  *
668  * The pcm operators have to be set afterwards to the new instance
669  * via snd_pcm_set_ops().
670  *
671  * Returns zero if successful, or a negative error code on failure.
672  */
673 int snd_pcm_new(struct snd_card *card, char *id, int device,
674                 int playback_count, int capture_count,
675                 struct snd_pcm ** rpcm)
676 {
677         struct snd_pcm *pcm;
678         int err;
679         static struct snd_device_ops ops = {
680                 .dev_free = snd_pcm_dev_free,
681                 .dev_register = snd_pcm_dev_register,
682                 .dev_disconnect = snd_pcm_dev_disconnect,
683         };
684
685         snd_assert(rpcm != NULL, return -EINVAL);
686         *rpcm = NULL;
687         snd_assert(card != NULL, return -ENXIO);
688         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
689         if (pcm == NULL) {
690                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
691                 return -ENOMEM;
692         }
693         pcm->card = card;
694         pcm->device = device;
695         if (id)
696                 strlcpy(pcm->id, id, sizeof(pcm->id));
697         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
698                 snd_pcm_free(pcm);
699                 return err;
700         }
701         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
702                 snd_pcm_free(pcm);
703                 return err;
704         }
705         mutex_init(&pcm->open_mutex);
706         init_waitqueue_head(&pcm->open_wait);
707         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
708                 snd_pcm_free(pcm);
709                 return err;
710         }
711         *rpcm = pcm;
712         return 0;
713 }
714
715 EXPORT_SYMBOL(snd_pcm_new);
716
717 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
718 {
719         struct snd_pcm_substream *substream, *substream_next;
720 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
721         struct snd_pcm_oss_setup *setup, *setupn;
722 #endif
723         substream = pstr->substream;
724         while (substream) {
725                 substream_next = substream->next;
726                 snd_pcm_timer_done(substream);
727                 snd_pcm_substream_proc_done(substream);
728                 kfree(substream);
729                 substream = substream_next;
730         }
731         snd_pcm_stream_proc_done(pstr);
732 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
733         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
734                 setupn = setup->next;
735                 kfree(setup->task_name);
736                 kfree(setup);
737         }
738 #endif
739 }
740
741 static int snd_pcm_free(struct snd_pcm *pcm)
742 {
743         struct snd_pcm_notify *notify;
744
745         snd_assert(pcm != NULL, return -ENXIO);
746         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
747                 notify->n_unregister(pcm);
748         }
749         if (pcm->private_free)
750                 pcm->private_free(pcm);
751         snd_pcm_lib_preallocate_free_for_all(pcm);
752         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
753         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
754         kfree(pcm);
755         return 0;
756 }
757
758 static int snd_pcm_dev_free(struct snd_device *device)
759 {
760         struct snd_pcm *pcm = device->device_data;
761         return snd_pcm_free(pcm);
762 }
763
764 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
765                              struct file *file,
766                              struct snd_pcm_substream **rsubstream)
767 {
768         struct snd_pcm_str * pstr;
769         struct snd_pcm_substream *substream;
770         struct snd_pcm_runtime *runtime;
771         struct snd_ctl_file *kctl;
772         struct snd_card *card;
773         int prefer_subdevice = -1;
774         size_t size;
775
776         snd_assert(rsubstream != NULL, return -EINVAL);
777         *rsubstream = NULL;
778         snd_assert(pcm != NULL, return -ENXIO);
779         pstr = &pcm->streams[stream];
780         if (pstr->substream == NULL || pstr->substream_count == 0)
781                 return -ENODEV;
782
783         card = pcm->card;
784         down_read(&card->controls_rwsem);
785         list_for_each_entry(kctl, &card->ctl_files, list) {
786                 if (kctl->pid == current->pid) {
787                         prefer_subdevice = kctl->prefer_pcm_subdevice;
788                         if (prefer_subdevice != -1)
789                                 break;
790                 }
791         }
792         up_read(&card->controls_rwsem);
793
794         switch (stream) {
795         case SNDRV_PCM_STREAM_PLAYBACK:
796                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
797                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
798                                 if (SUBSTREAM_BUSY(substream))
799                                         return -EAGAIN;
800                         }
801                 }
802                 break;
803         case SNDRV_PCM_STREAM_CAPTURE:
804                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
805                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
806                                 if (SUBSTREAM_BUSY(substream))
807                                         return -EAGAIN;
808                         }
809                 }
810                 break;
811         default:
812                 return -EINVAL;
813         }
814
815         if (file->f_flags & O_APPEND) {
816                 if (prefer_subdevice < 0) {
817                         if (pstr->substream_count > 1)
818                                 return -EINVAL; /* must be unique */
819                         substream = pstr->substream;
820                 } else {
821                         for (substream = pstr->substream; substream;
822                              substream = substream->next)
823                                 if (substream->number == prefer_subdevice)
824                                         break;
825                 }
826                 if (! substream)
827                         return -ENODEV;
828                 if (! SUBSTREAM_BUSY(substream))
829                         return -EBADFD;
830                 substream->ref_count++;
831                 *rsubstream = substream;
832                 return 0;
833         }
834
835         if (prefer_subdevice >= 0) {
836                 for (substream = pstr->substream; substream; substream = substream->next)
837                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
838                                 goto __ok;
839         }
840         for (substream = pstr->substream; substream; substream = substream->next)
841                 if (!SUBSTREAM_BUSY(substream))
842                         break;
843       __ok:
844         if (substream == NULL)
845                 return -EAGAIN;
846
847         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
848         if (runtime == NULL)
849                 return -ENOMEM;
850
851         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
852         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
853         if (runtime->status == NULL) {
854                 kfree(runtime);
855                 return -ENOMEM;
856         }
857         memset((void*)runtime->status, 0, size);
858
859         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
860         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
861         if (runtime->control == NULL) {
862                 snd_free_pages((void*)runtime->status,
863                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
864                 kfree(runtime);
865                 return -ENOMEM;
866         }
867         memset((void*)runtime->control, 0, size);
868
869         init_waitqueue_head(&runtime->sleep);
870
871         runtime->status->state = SNDRV_PCM_STATE_OPEN;
872
873         substream->runtime = runtime;
874         substream->private_data = pcm->private_data;
875         substream->ref_count = 1;
876         substream->f_flags = file->f_flags;
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
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 ssize_t show_pcm_class(struct device *dev,
901                               struct device_attribute *attr, char *buf)
902 {
903         struct snd_pcm *pcm;
904         const char *str;
905         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
906                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
907                 [SNDRV_PCM_CLASS_MULTI] = "multi",
908                 [SNDRV_PCM_CLASS_MODEM] = "modem",
909                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
910         };
911
912         if (! (pcm = dev_get_drvdata(dev)) ||
913             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
914                 str = "none";
915         else
916                 str = strs[pcm->dev_class];
917         return snprintf(buf, PAGE_SIZE, "%s\n", str);
918 }
919
920 static struct device_attribute pcm_attrs =
921         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
922
923 static int snd_pcm_dev_register(struct snd_device *device)
924 {
925         int cidx, err;
926         struct snd_pcm_substream *substream;
927         struct snd_pcm_notify *notify;
928         char str[16];
929         struct snd_pcm *pcm = device->device_data;
930         struct device *dev;
931
932         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
933         mutex_lock(&register_mutex);
934         if (snd_pcm_search(pcm->card, pcm->device)) {
935                 mutex_unlock(&register_mutex);
936                 return -EBUSY;
937         }
938         list_add_tail(&pcm->list, &snd_pcm_devices);
939         for (cidx = 0; cidx < 2; cidx++) {
940                 int devtype = -1;
941                 if (pcm->streams[cidx].substream == NULL)
942                         continue;
943                 switch (cidx) {
944                 case SNDRV_PCM_STREAM_PLAYBACK:
945                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
946                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
947                         break;
948                 case SNDRV_PCM_STREAM_CAPTURE:
949                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
950                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
951                         break;
952                 }
953                 /* device pointer to use, pcm->dev takes precedence if
954                  * it is assigned, otherwise fall back to card's device
955                  * if possible */
956                 dev = pcm->dev;
957                 if (!dev)
958                         dev = snd_card_get_device_link(pcm->card);
959                 /* register pcm */
960                 err = snd_register_device_for_dev(devtype, pcm->card,
961                                                   pcm->device,
962                                                   &snd_pcm_f_ops[cidx],
963                                                   pcm, str, dev);
964                 if (err < 0) {
965                         list_del(&pcm->list);
966                         mutex_unlock(&register_mutex);
967                         return err;
968                 }
969                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
970                                           &pcm_attrs);
971                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
972                         snd_pcm_timer_init(substream);
973         }
974
975         list_for_each_entry(notify, &snd_pcm_notify_list, list)
976                 notify->n_register(pcm);
977
978         mutex_unlock(&register_mutex);
979         return 0;
980 }
981
982 static int snd_pcm_dev_disconnect(struct snd_device *device)
983 {
984         struct snd_pcm *pcm = device->device_data;
985         struct snd_pcm_notify *notify;
986         struct snd_pcm_substream *substream;
987         int cidx, devtype;
988
989         mutex_lock(&register_mutex);
990         if (list_empty(&pcm->list))
991                 goto unlock;
992
993         list_del_init(&pcm->list);
994         for (cidx = 0; cidx < 2; cidx++)
995                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
996                         if (substream->runtime)
997                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
998         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
999                 notify->n_disconnect(pcm);
1000         }
1001         for (cidx = 0; cidx < 2; cidx++) {
1002                 devtype = -1;
1003                 switch (cidx) {
1004                 case SNDRV_PCM_STREAM_PLAYBACK:
1005                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1006                         break;
1007                 case SNDRV_PCM_STREAM_CAPTURE:
1008                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1009                         break;
1010                 }
1011                 snd_unregister_device(devtype, pcm->card, pcm->device);
1012         }
1013  unlock:
1014         mutex_unlock(&register_mutex);
1015         return 0;
1016 }
1017
1018 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1019 {
1020         struct snd_pcm *pcm;
1021
1022         snd_assert(notify != NULL &&
1023                    notify->n_register != NULL &&
1024                    notify->n_unregister != NULL &&
1025                    notify->n_disconnect, return -EINVAL);
1026         mutex_lock(&register_mutex);
1027         if (nfree) {
1028                 list_del(&notify->list);
1029                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1030                         notify->n_unregister(pcm);
1031         } else {
1032                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1033                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1034                         notify->n_register(pcm);
1035         }
1036         mutex_unlock(&register_mutex);
1037         return 0;
1038 }
1039
1040 EXPORT_SYMBOL(snd_pcm_notify);
1041
1042 #ifdef CONFIG_PROC_FS
1043 /*
1044  *  Info interface
1045  */
1046
1047 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1048                               struct snd_info_buffer *buffer)
1049 {
1050         struct snd_pcm *pcm;
1051
1052         mutex_lock(&register_mutex);
1053         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1054                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1055                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1056                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1057                         snd_iprintf(buffer, " : playback %i",
1058                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1059                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1060                         snd_iprintf(buffer, " : capture %i",
1061                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1062                 snd_iprintf(buffer, "\n");
1063         }
1064         mutex_unlock(&register_mutex);
1065 }
1066
1067 static struct snd_info_entry *snd_pcm_proc_entry;
1068
1069 static void snd_pcm_proc_init(void)
1070 {
1071         struct snd_info_entry *entry;
1072
1073         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1074                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1075                 if (snd_info_register(entry) < 0) {
1076                         snd_info_free_entry(entry);
1077                         entry = NULL;
1078                 }
1079         }
1080         snd_pcm_proc_entry = entry;
1081 }
1082
1083 static void snd_pcm_proc_done(void)
1084 {
1085         snd_info_free_entry(snd_pcm_proc_entry);
1086 }
1087
1088 #else /* !CONFIG_PROC_FS */
1089 #define snd_pcm_proc_init()
1090 #define snd_pcm_proc_done()
1091 #endif /* CONFIG_PROC_FS */
1092
1093
1094 /*
1095  *  ENTRY functions
1096  */
1097
1098 static int __init alsa_pcm_init(void)
1099 {
1100         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1101         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1102         snd_pcm_proc_init();
1103         return 0;
1104 }
1105
1106 static void __exit alsa_pcm_exit(void)
1107 {
1108         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1109         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1110         snd_pcm_proc_done();
1111 }
1112
1113 module_init(alsa_pcm_init)
1114 module_exit(alsa_pcm_exit)