Merge branch 'master'
[linux-2.6] / sound / core / pcm.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/pcm.h>
29 #include <sound/control.h>
30 #include <sound/info.h>
31
32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
35
36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DECLARE_MUTEX(register_mutex);
39
40 static int snd_pcm_free(snd_pcm_t *pcm);
41 static int snd_pcm_dev_free(snd_device_t *device);
42 static int snd_pcm_dev_register(snd_device_t *device);
43 static int snd_pcm_dev_disconnect(snd_device_t *device);
44 static int snd_pcm_dev_unregister(snd_device_t *device);
45
46 static int snd_pcm_control_ioctl(snd_card_t * card,
47                                  snd_ctl_file_t * control,
48                                  unsigned int cmd, unsigned long arg)
49 {
50         unsigned int tmp;
51
52         tmp = card->number * SNDRV_PCM_DEVICES;
53         switch (cmd) {
54         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
55                 {
56                         int device;
57
58                         if (get_user(device, (int __user *)arg))
59                                 return -EFAULT;
60                         device = device < 0 ? 0 : device + 1;
61                         while (device < SNDRV_PCM_DEVICES) {
62                                 if (snd_pcm_devices[tmp + device])
63                                         break;
64                                 device++;
65                         }
66                         if (device == SNDRV_PCM_DEVICES)
67                                 device = -1;
68                         if (put_user(device, (int __user *)arg))
69                                 return -EFAULT;
70                         return 0;
71                 }
72         case SNDRV_CTL_IOCTL_PCM_INFO:
73                 {
74                         snd_pcm_info_t __user *info;
75                         unsigned int device, subdevice;
76                         snd_pcm_stream_t stream;
77                         snd_pcm_t *pcm;
78                         snd_pcm_str_t *pstr;
79                         snd_pcm_substream_t *substream;
80                         info = (snd_pcm_info_t __user *)arg;
81                         if (get_user(device, &info->device))
82                                 return -EFAULT;
83                         if (device >= SNDRV_PCM_DEVICES)
84                                 return -ENXIO;
85                         pcm = snd_pcm_devices[tmp + device];
86                         if (pcm == NULL)
87                                 return -ENXIO;
88                         if (get_user(stream, &info->stream))
89                                 return -EFAULT;
90                         if (stream < 0 || stream > 1)
91                                 return -EINVAL;
92                         pstr = &pcm->streams[stream];
93                         if (pstr->substream_count == 0)
94                                 return -ENOENT;
95                         if (get_user(subdevice, &info->subdevice))
96                                 return -EFAULT;
97                         if (subdevice >= pstr->substream_count)
98                                 return -ENXIO;
99                         for (substream = pstr->substream; substream; substream = substream->next)
100                                 if (substream->number == (int)subdevice)
101                                         break;
102                         if (substream == NULL)
103                                 return -ENXIO;
104                         return snd_pcm_info_user(substream, info);
105                 }
106         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
107                 {
108                         int val;
109                         
110                         if (get_user(val, (int __user *)arg))
111                                 return -EFAULT;
112                         control->prefer_pcm_subdevice = val;
113                         return 0;
114                 }
115         }
116         return -ENOIOCTLCMD;
117 }
118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
125 #define START(v) [SNDRV_PCM_START_##v] = #v
126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
128
129 static char *snd_pcm_stream_names[] = {
130         STREAM(PLAYBACK),
131         STREAM(CAPTURE),
132 };
133
134 static char *snd_pcm_state_names[] = {
135         STATE(OPEN),
136         STATE(SETUP),
137         STATE(PREPARED),
138         STATE(RUNNING),
139         STATE(XRUN),
140         STATE(DRAINING),
141         STATE(PAUSED),
142         STATE(SUSPENDED),
143 };
144
145 static char *snd_pcm_access_names[] = {
146         ACCESS(MMAP_INTERLEAVED), 
147         ACCESS(MMAP_NONINTERLEAVED),
148         ACCESS(MMAP_COMPLEX),
149         ACCESS(RW_INTERLEAVED),
150         ACCESS(RW_NONINTERLEAVED),
151 };
152
153 static char *snd_pcm_format_names[] = {
154         FORMAT(S8),
155         FORMAT(U8),
156         FORMAT(S16_LE),
157         FORMAT(S16_BE),
158         FORMAT(U16_LE),
159         FORMAT(U16_BE),
160         FORMAT(S24_LE),
161         FORMAT(S24_BE),
162         FORMAT(U24_LE),
163         FORMAT(U24_BE),
164         FORMAT(S32_LE),
165         FORMAT(S32_BE),
166         FORMAT(U32_LE),
167         FORMAT(U32_BE),
168         FORMAT(FLOAT_LE),
169         FORMAT(FLOAT_BE),
170         FORMAT(FLOAT64_LE),
171         FORMAT(FLOAT64_BE),
172         FORMAT(IEC958_SUBFRAME_LE),
173         FORMAT(IEC958_SUBFRAME_BE),
174         FORMAT(MU_LAW),
175         FORMAT(A_LAW),
176         FORMAT(IMA_ADPCM),
177         FORMAT(MPEG),
178         FORMAT(GSM),
179         FORMAT(SPECIAL),
180         FORMAT(S24_3LE),
181         FORMAT(S24_3BE),
182         FORMAT(U24_3LE),
183         FORMAT(U24_3BE),
184         FORMAT(S20_3LE),
185         FORMAT(S20_3BE),
186         FORMAT(U20_3LE),
187         FORMAT(U20_3BE),
188         FORMAT(S18_3LE),
189         FORMAT(S18_3BE),
190         FORMAT(U18_3LE),
191         FORMAT(U18_3BE),
192 };
193
194 static char *snd_pcm_subformat_names[] = {
195         SUBFORMAT(STD), 
196 };
197
198 static char *snd_pcm_tstamp_mode_names[] = {
199         TSTAMP(NONE),
200         TSTAMP(MMAP),
201 };
202
203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
204 {
205         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
206         return snd_pcm_stream_names[stream];
207 }
208
209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
210 {
211         snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
212         return snd_pcm_access_names[access];
213 }
214
215 const char *snd_pcm_format_name(snd_pcm_format_t format)
216 {
217         snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
218         return snd_pcm_format_names[format];
219 }
220
221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
222 {
223         snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
224         return snd_pcm_subformat_names[subformat];
225 }
226
227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
228 {
229         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
230         return snd_pcm_tstamp_mode_names[mode];
231 }
232
233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
234 {
235         snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
236         return snd_pcm_state_names[state];
237 }
238
239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
240 #include <linux/soundcard.h>
241 static const char *snd_pcm_oss_format_name(int format)
242 {
243         switch (format) {
244         case AFMT_MU_LAW:
245                 return "MU_LAW";
246         case AFMT_A_LAW:
247                 return "A_LAW";
248         case AFMT_IMA_ADPCM:
249                 return "IMA_ADPCM";
250         case AFMT_U8:
251                 return "U8";
252         case AFMT_S16_LE:
253                 return "S16_LE";
254         case AFMT_S16_BE:
255                 return "S16_BE";
256         case AFMT_S8:
257                 return "S8";
258         case AFMT_U16_LE:
259                 return "U16_LE";
260         case AFMT_U16_BE:
261                 return "U16_BE";
262         case AFMT_MPEG:
263                 return "MPEG";
264         default:
265                 return "unknown";
266         }
267 }
268 #endif
269
270 #ifdef CONFIG_PROC_FS
271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
272 {
273         snd_pcm_info_t *info;
274         int err;
275
276         snd_runtime_check(substream, return);
277
278         info = kmalloc(sizeof(*info), GFP_KERNEL);
279         if (! info) {
280                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
281                 return;
282         }
283
284         err = snd_pcm_info(substream, info);
285         if (err < 0) {
286                 snd_iprintf(buffer, "error %d\n", err);
287                 kfree(info);
288                 return;
289         }
290         snd_iprintf(buffer, "card: %d\n", info->card);
291         snd_iprintf(buffer, "device: %d\n", info->device);
292         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
293         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
294         snd_iprintf(buffer, "id: %s\n", info->id);
295         snd_iprintf(buffer, "name: %s\n", info->name);
296         snd_iprintf(buffer, "subname: %s\n", info->subname);
297         snd_iprintf(buffer, "class: %d\n", info->dev_class);
298         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
299         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
300         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
301         kfree(info);
302 }
303
304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
305 {
306         snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
307 }
308
309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
310 {
311         snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
312 }
313
314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
315 {
316         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
317         snd_pcm_runtime_t *runtime = substream->runtime;
318         if (!runtime) {
319                 snd_iprintf(buffer, "closed\n");
320                 return;
321         }
322         snd_pcm_stream_lock_irq(substream);
323         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
324                 snd_iprintf(buffer, "no setup\n");
325                 snd_pcm_stream_unlock_irq(substream);
326                 return;
327         }
328         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
329         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
330         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
331         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
332         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
333         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
334         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
335         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
337         if (substream->oss.oss) {
338                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
339                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
340                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
341                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
342                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
343                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
344         }
345 #endif
346         snd_pcm_stream_unlock_irq(substream);
347 }
348
349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
350 {
351         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
352         snd_pcm_runtime_t *runtime = substream->runtime;
353         if (!runtime) {
354                 snd_iprintf(buffer, "closed\n");
355                 return;
356         }
357         snd_pcm_stream_lock_irq(substream);
358         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
359                 snd_iprintf(buffer, "no setup\n");
360                 snd_pcm_stream_unlock_irq(substream);
361                 return;
362         }
363         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
364         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
365         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
366         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
367         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
368         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
369         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
370         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
371         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
372         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
373         snd_pcm_stream_unlock_irq(substream);
374 }
375
376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
377 {
378         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
379         snd_pcm_runtime_t *runtime = substream->runtime;
380         snd_pcm_status_t status;
381         int err;
382         if (!runtime) {
383                 snd_iprintf(buffer, "closed\n");
384                 return;
385         }
386         memset(&status, 0, sizeof(status));
387         err = snd_pcm_status(substream, &status);
388         if (err < 0) {
389                 snd_iprintf(buffer, "error %d\n", err);
390                 return;
391         }
392         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
393         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
394                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
395         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
396                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
397         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
398         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
399         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
400         snd_iprintf(buffer, "-----\n");
401         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
402         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
403 }
404 #endif
405
406 #ifdef CONFIG_SND_DEBUG
407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
408 {
409         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
410         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
411 }
412
413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
414 {
415         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
416         char line[64];
417         if (!snd_info_get_line(buffer, line, sizeof(line)))
418                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
419 }
420 #endif
421
422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
423 {
424         snd_pcm_t *pcm = pstr->pcm;
425         snd_info_entry_t *entry;
426         char name[16];
427
428         sprintf(name, "pcm%i%c", pcm->device, 
429                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
430         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
431                 return -ENOMEM;
432         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
433         if (snd_info_register(entry) < 0) {
434                 snd_info_free_entry(entry);
435                 return -ENOMEM;
436         }
437         pstr->proc_root = entry;
438
439         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
440                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
441                 if (snd_info_register(entry) < 0) {
442                         snd_info_free_entry(entry);
443                         entry = NULL;
444                 }
445         }
446         pstr->proc_info_entry = entry;
447
448 #ifdef CONFIG_SND_DEBUG
449         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
450                 entry->c.text.read_size = 64;
451                 entry->c.text.read = snd_pcm_xrun_debug_read;
452                 entry->c.text.write_size = 64;
453                 entry->c.text.write = snd_pcm_xrun_debug_write;
454                 entry->mode |= S_IWUSR;
455                 entry->private_data = pstr;
456                 if (snd_info_register(entry) < 0) {
457                         snd_info_free_entry(entry);
458                         entry = NULL;
459                 }
460         }
461         pstr->proc_xrun_debug_entry = entry;
462 #endif
463         return 0;
464 }
465
466 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
467 {
468 #ifdef CONFIG_SND_DEBUG
469         if (pstr->proc_xrun_debug_entry) {
470                 snd_info_unregister(pstr->proc_xrun_debug_entry);
471                 pstr->proc_xrun_debug_entry = NULL;
472         }
473 #endif
474         if (pstr->proc_info_entry) {
475                 snd_info_unregister(pstr->proc_info_entry);
476                 pstr->proc_info_entry = NULL;
477         }
478         if (pstr->proc_root) {
479                 snd_info_unregister(pstr->proc_root);
480                 pstr->proc_root = NULL;
481         }
482         return 0;
483 }
484
485 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
486 {
487         snd_info_entry_t *entry;
488         snd_card_t *card;
489         char name[16];
490
491         card = substream->pcm->card;
492
493         sprintf(name, "sub%i", substream->number);
494         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
495                 return -ENOMEM;
496         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
497         if (snd_info_register(entry) < 0) {
498                 snd_info_free_entry(entry);
499                 return -ENOMEM;
500         }
501         substream->proc_root = entry;
502
503         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
504                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
505                 if (snd_info_register(entry) < 0) {
506                         snd_info_free_entry(entry);
507                         entry = NULL;
508                 }
509         }
510         substream->proc_info_entry = entry;
511
512         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
513                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
514                 if (snd_info_register(entry) < 0) {
515                         snd_info_free_entry(entry);
516                         entry = NULL;
517                 }
518         }
519         substream->proc_hw_params_entry = entry;
520
521         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
522                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
523                 if (snd_info_register(entry) < 0) {
524                         snd_info_free_entry(entry);
525                         entry = NULL;
526                 }
527         }
528         substream->proc_sw_params_entry = entry;
529
530         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
531                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
532                 if (snd_info_register(entry) < 0) {
533                         snd_info_free_entry(entry);
534                         entry = NULL;
535                 }
536         }
537         substream->proc_status_entry = entry;
538
539         return 0;
540 }
541                 
542 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
543 {
544         if (substream->proc_info_entry) {
545                 snd_info_unregister(substream->proc_info_entry);
546                 substream->proc_info_entry = NULL;
547         }
548         if (substream->proc_hw_params_entry) {
549                 snd_info_unregister(substream->proc_hw_params_entry);
550                 substream->proc_hw_params_entry = NULL;
551         }
552         if (substream->proc_sw_params_entry) {
553                 snd_info_unregister(substream->proc_sw_params_entry);
554                 substream->proc_sw_params_entry = NULL;
555         }
556         if (substream->proc_status_entry) {
557                 snd_info_unregister(substream->proc_status_entry);
558                 substream->proc_status_entry = NULL;
559         }
560         if (substream->proc_root) {
561                 snd_info_unregister(substream->proc_root);
562                 substream->proc_root = NULL;
563         }
564         return 0;
565 }
566
567 /**
568  * snd_pcm_new_stream - create a new PCM stream
569  * @pcm: the pcm instance
570  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
571  * @substream_count: the number of substreams
572  *
573  * Creates a new stream for the pcm.
574  * The corresponding stream on the pcm must have been empty before
575  * calling this, i.e. zero must be given to the argument of
576  * snd_pcm_new().
577  *
578  * Returns zero if successful, or a negative error code on failure.
579  */
580 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
581 {
582         int idx, err;
583         snd_pcm_str_t *pstr = &pcm->streams[stream];
584         snd_pcm_substream_t *substream, *prev;
585
586 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
587         init_MUTEX(&pstr->oss.setup_mutex);
588 #endif
589         pstr->stream = stream;
590         pstr->pcm = pcm;
591         pstr->substream_count = substream_count;
592         pstr->reg = &snd_pcm_reg[stream];
593         if (substream_count > 0) {
594                 err = snd_pcm_stream_proc_init(pstr);
595                 if (err < 0)
596                         return err;
597         }
598         prev = NULL;
599         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
600                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
601                 if (substream == NULL)
602                         return -ENOMEM;
603                 substream->pcm = pcm;
604                 substream->pstr = pstr;
605                 substream->number = idx;
606                 substream->stream = stream;
607                 sprintf(substream->name, "subdevice #%i", idx);
608                 substream->buffer_bytes_max = UINT_MAX;
609                 if (prev == NULL)
610                         pstr->substream = substream;
611                 else
612                         prev->next = substream;
613                 err = snd_pcm_substream_proc_init(substream);
614                 if (err < 0) {
615                         kfree(substream);
616                         return err;
617                 }
618                 substream->group = &substream->self_group;
619                 spin_lock_init(&substream->self_group.lock);
620                 INIT_LIST_HEAD(&substream->self_group.substreams);
621                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
622                 spin_lock_init(&substream->timer_lock);
623                 prev = substream;
624         }
625         return 0;
626 }                               
627
628 /**
629  * snd_pcm_new - create a new PCM instance
630  * @card: the card instance
631  * @id: the id string
632  * @device: the device index (zero based)
633  * @playback_count: the number of substreams for playback
634  * @capture_count: the number of substreams for capture
635  * @rpcm: the pointer to store the new pcm instance
636  *
637  * Creates a new PCM instance.
638  *
639  * The pcm operators have to be set afterwards to the new instance
640  * via snd_pcm_set_ops().
641  *
642  * Returns zero if successful, or a negative error code on failure.
643  */
644 int snd_pcm_new(snd_card_t * card, char *id, int device,
645                 int playback_count, int capture_count,
646                 snd_pcm_t ** rpcm)
647 {
648         snd_pcm_t *pcm;
649         int err;
650         static snd_device_ops_t ops = {
651                 .dev_free = snd_pcm_dev_free,
652                 .dev_register = snd_pcm_dev_register,
653                 .dev_disconnect = snd_pcm_dev_disconnect,
654                 .dev_unregister = snd_pcm_dev_unregister
655         };
656
657         snd_assert(rpcm != NULL, return -EINVAL);
658         *rpcm = NULL;
659         snd_assert(card != NULL, return -ENXIO);
660         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
661         if (pcm == NULL)
662                 return -ENOMEM;
663         pcm->card = card;
664         pcm->device = device;
665         if (id) {
666                 strlcpy(pcm->id, id, sizeof(pcm->id));
667         }
668         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
669                 snd_pcm_free(pcm);
670                 return err;
671         }
672         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
673                 snd_pcm_free(pcm);
674                 return err;
675         }
676         init_MUTEX(&pcm->open_mutex);
677         init_waitqueue_head(&pcm->open_wait);
678         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
679                 snd_pcm_free(pcm);
680                 return err;
681         }
682         *rpcm = pcm;
683         return 0;
684 }
685
686 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
687 {
688         snd_pcm_substream_t *substream, *substream_next;
689 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
690         snd_pcm_oss_setup_t *setup, *setupn;
691 #endif
692         substream = pstr->substream;
693         while (substream) {
694                 substream_next = substream->next;
695                 snd_pcm_substream_proc_done(substream);
696                 kfree(substream);
697                 substream = substream_next;
698         }
699         snd_pcm_stream_proc_done(pstr);
700 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
701         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
702                 setupn = setup->next;
703                 kfree(setup->task_name);
704                 kfree(setup);
705         }
706 #endif
707 }
708
709 static int snd_pcm_free(snd_pcm_t *pcm)
710 {
711         snd_assert(pcm != NULL, return -ENXIO);
712         if (pcm->private_free)
713                 pcm->private_free(pcm);
714         snd_pcm_lib_preallocate_free_for_all(pcm);
715         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
716         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
717         kfree(pcm);
718         return 0;
719 }
720
721 static int snd_pcm_dev_free(snd_device_t *device)
722 {
723         snd_pcm_t *pcm = device->device_data;
724         return snd_pcm_free(pcm);
725 }
726
727 static void snd_pcm_tick_timer_func(unsigned long data)
728 {
729         snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
730         snd_pcm_tick_elapsed(substream);
731 }
732
733 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
734                            snd_pcm_substream_t **rsubstream)
735 {
736         snd_pcm_str_t * pstr;
737         snd_pcm_substream_t * substream;
738         snd_pcm_runtime_t * runtime;
739         snd_ctl_file_t *kctl;
740         snd_card_t *card;
741         struct list_head *list;
742         int prefer_subdevice = -1;
743         size_t size;
744
745         snd_assert(rsubstream != NULL, return -EINVAL);
746         *rsubstream = NULL;
747         snd_assert(pcm != NULL, return -ENXIO);
748         pstr = &pcm->streams[stream];
749         if (pstr->substream == NULL)
750                 return -ENODEV;
751
752         card = pcm->card;
753         down_read(&card->controls_rwsem);
754         list_for_each(list, &card->ctl_files) {
755                 kctl = snd_ctl_file(list);
756                 if (kctl->pid == current->pid) {
757                         prefer_subdevice = kctl->prefer_pcm_subdevice;
758                         break;
759                 }
760         }
761         up_read(&card->controls_rwsem);
762
763         if (pstr->substream_count == 0)
764                 return -ENODEV;
765         switch (stream) {
766         case SNDRV_PCM_STREAM_PLAYBACK:
767                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
768                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
769                                 if (SUBSTREAM_BUSY(substream))
770                                         return -EAGAIN;
771                         }
772                 }
773                 break;
774         case SNDRV_PCM_STREAM_CAPTURE:
775                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
776                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
777                                 if (SUBSTREAM_BUSY(substream))
778                                         return -EAGAIN;
779                         }
780                 }
781                 break;
782         default:
783                 return -EINVAL;
784         }
785
786         if (prefer_subdevice >= 0) {
787                 for (substream = pstr->substream; substream; substream = substream->next)
788                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
789                                 goto __ok;
790         }
791         for (substream = pstr->substream; substream; substream = substream->next)
792                 if (!SUBSTREAM_BUSY(substream))
793                         break;
794       __ok:
795         if (substream == NULL)
796                 return -EAGAIN;
797
798         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
799         if (runtime == NULL)
800                 return -ENOMEM;
801
802         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
803         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
804         if (runtime->status == NULL) {
805                 kfree(runtime);
806                 return -ENOMEM;
807         }
808         memset((void*)runtime->status, 0, size);
809
810         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
811         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
812         if (runtime->control == NULL) {
813                 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
814                 kfree(runtime);
815                 return -ENOMEM;
816         }
817         memset((void*)runtime->control, 0, size);
818
819         init_waitqueue_head(&runtime->sleep);
820         atomic_set(&runtime->mmap_count, 0);
821         init_timer(&runtime->tick_timer);
822         runtime->tick_timer.function = snd_pcm_tick_timer_func;
823         runtime->tick_timer.data = (unsigned long) substream;
824
825         runtime->status->state = SNDRV_PCM_STATE_OPEN;
826
827         substream->runtime = runtime;
828         substream->private_data = pcm->private_data;
829         pstr->substream_opened++;
830         *rsubstream = substream;
831         return 0;
832 }
833
834 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
835 {
836         snd_pcm_runtime_t * runtime;
837         substream->file = NULL;
838         runtime = substream->runtime;
839         snd_assert(runtime != NULL, return);
840         if (runtime->private_free != NULL)
841                 runtime->private_free(runtime);
842         snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
843         snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
844         kfree(runtime->hw_constraints.rules);
845         kfree(runtime);
846         substream->runtime = NULL;
847         substream->pstr->substream_opened--;
848 }
849
850 static int snd_pcm_dev_register(snd_device_t *device)
851 {
852         int idx, cidx, err;
853         unsigned short minor;
854         snd_pcm_substream_t *substream;
855         struct list_head *list;
856         char str[16];
857         snd_pcm_t *pcm = device->device_data;
858
859         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
860         down(&register_mutex);
861         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
862         if (snd_pcm_devices[idx]) {
863                 up(&register_mutex);
864                 return -EBUSY;
865         }
866         snd_pcm_devices[idx] = pcm;
867         for (cidx = 0; cidx < 2; cidx++) {
868                 int devtype = -1;
869                 if (pcm->streams[cidx].substream == NULL)
870                         continue;
871                 switch (cidx) {
872                 case SNDRV_PCM_STREAM_PLAYBACK:
873                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
874                         minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
875                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
876                         break;
877                 case SNDRV_PCM_STREAM_CAPTURE:
878                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
879                         minor = SNDRV_MINOR_PCM_CAPTURE + idx;
880                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
881                         break;
882                 }
883                 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
884                         snd_pcm_devices[idx] = NULL;
885                         up(&register_mutex);
886                         return err;
887                 }
888                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
889                         snd_pcm_timer_init(substream);
890         }
891         list_for_each(list, &snd_pcm_notify_list) {
892                 snd_pcm_notify_t *notify;
893                 notify = list_entry(list, snd_pcm_notify_t, list);
894                 notify->n_register(pcm);
895         }
896         up(&register_mutex);
897         return 0;
898 }
899
900 static int snd_pcm_dev_disconnect(snd_device_t *device)
901 {
902         snd_pcm_t *pcm = device->device_data;
903         struct list_head *list;
904         snd_pcm_substream_t *substream;
905         int idx, cidx;
906
907         down(&register_mutex);
908         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
909         snd_pcm_devices[idx] = NULL;
910         for (cidx = 0; cidx < 2; cidx++)
911                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
912                         if (substream->runtime)
913                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
914         list_for_each(list, &snd_pcm_notify_list) {
915                 snd_pcm_notify_t *notify;
916                 notify = list_entry(list, snd_pcm_notify_t, list);
917                 notify->n_disconnect(pcm);
918         }
919         up(&register_mutex);
920         return 0;
921 }
922
923 static int snd_pcm_dev_unregister(snd_device_t *device)
924 {
925         int idx, cidx, devtype;
926         snd_pcm_substream_t *substream;
927         struct list_head *list;
928         snd_pcm_t *pcm = device->device_data;
929
930         snd_assert(pcm != NULL, return -ENXIO);
931         down(&register_mutex);
932         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
933         snd_pcm_devices[idx] = NULL;
934         for (cidx = 0; cidx < 2; cidx++) {
935                 devtype = -1;
936                 switch (cidx) {
937                 case SNDRV_PCM_STREAM_PLAYBACK:
938                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
939                         break;
940                 case SNDRV_PCM_STREAM_CAPTURE:
941                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
942                         break;
943                 }
944                 snd_unregister_device(devtype, pcm->card, pcm->device);
945                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
946                         snd_pcm_timer_done(substream);
947         }
948         list_for_each(list, &snd_pcm_notify_list) {
949                 snd_pcm_notify_t *notify;
950                 notify = list_entry(list, snd_pcm_notify_t, list);
951                 notify->n_unregister(pcm);
952         }
953         up(&register_mutex);
954         return snd_pcm_free(pcm);
955 }
956
957 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
958 {
959         int idx;
960
961         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
962         down(&register_mutex);
963         if (nfree) {
964                 list_del(&notify->list);
965                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
966                         if (snd_pcm_devices[idx] == NULL)
967                                 continue;
968                         notify->n_unregister(snd_pcm_devices[idx]);
969                 }
970         } else {
971                 list_add_tail(&notify->list, &snd_pcm_notify_list);
972                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
973                         if (snd_pcm_devices[idx] == NULL)
974                                 continue;
975                         notify->n_register(snd_pcm_devices[idx]);
976                 }
977         }
978         up(&register_mutex);
979         return 0;
980 }
981
982 /*
983  *  Info interface
984  */
985
986 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
987 {
988         int idx;
989         snd_pcm_t *pcm;
990
991         down(&register_mutex);
992         for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
993                 pcm = snd_pcm_devices[idx];
994                 if (pcm == NULL)
995                         continue;
996                 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
997                             idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
998                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
999                         snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1000                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1001                         snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1002                 snd_iprintf(buffer, "\n");
1003         }
1004         up(&register_mutex);
1005 }
1006
1007 /*
1008  *  ENTRY functions
1009  */
1010
1011 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1012
1013 static int __init alsa_pcm_init(void)
1014 {
1015         snd_info_entry_t *entry;
1016
1017         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1018         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1019         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1020                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1021                 if (snd_info_register(entry) < 0) {
1022                         snd_info_free_entry(entry);
1023                         entry = NULL;
1024                 }
1025         }
1026         snd_pcm_proc_entry = entry;
1027         return 0;
1028 }
1029
1030 static void __exit alsa_pcm_exit(void)
1031 {
1032         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1033         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1034         if (snd_pcm_proc_entry) {
1035                 snd_info_unregister(snd_pcm_proc_entry);
1036                 snd_pcm_proc_entry = NULL;
1037         }
1038 }
1039
1040 module_init(alsa_pcm_init)
1041 module_exit(alsa_pcm_exit)
1042
1043 EXPORT_SYMBOL(snd_pcm_devices);
1044 EXPORT_SYMBOL(snd_pcm_new);
1045 EXPORT_SYMBOL(snd_pcm_new_stream);
1046 EXPORT_SYMBOL(snd_pcm_notify);
1047 EXPORT_SYMBOL(snd_pcm_open_substream);
1048 EXPORT_SYMBOL(snd_pcm_release_substream);
1049 EXPORT_SYMBOL(snd_pcm_format_name);
1050   /* pcm_native.c */
1051 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1052 #ifdef CONFIG_PM
1053 EXPORT_SYMBOL(snd_pcm_suspend);
1054 EXPORT_SYMBOL(snd_pcm_suspend_all);
1055 #endif
1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_mmap_data);
1060 #if SNDRV_PCM_INFO_MMAP_IOMEM
1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1062 #endif
1063  /* pcm_misc.c */
1064 EXPORT_SYMBOL(snd_pcm_format_signed);
1065 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1066 EXPORT_SYMBOL(snd_pcm_format_linear);
1067 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1068 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_width);
1070 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1071 EXPORT_SYMBOL(snd_pcm_format_size);
1072 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1073 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1074 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1075 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);