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ALSA: Fix typos in alsa-driver-api.xml
[deliverable/linux.git] / sound / core / pcm.c
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CommitLineData
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/module.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/pcm.h>
31#include <sound/control.h>
32#include <sound/info.h>
33
34MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
35MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36MODULE_LICENSE("GPL");
37
38static LIST_HEAD(snd_pcm_devices);
39static LIST_HEAD(snd_pcm_notify_list);
40static DEFINE_MUTEX(register_mutex);
41
42static int snd_pcm_free(struct snd_pcm *pcm);
43static int snd_pcm_dev_free(struct snd_device *device);
44static int snd_pcm_dev_register(struct snd_device *device);
45static int snd_pcm_dev_disconnect(struct snd_device *device);
46
47static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
48{
49 struct snd_pcm *pcm;
50
51 list_for_each_entry(pcm, &snd_pcm_devices, list) {
52 if (pcm->internal)
53 continue;
54 if (pcm->card == card && pcm->device == device)
55 return pcm;
56 }
57 return NULL;
58}
59
60static int snd_pcm_next(struct snd_card *card, int device)
61{
62 struct snd_pcm *pcm;
63
64 list_for_each_entry(pcm, &snd_pcm_devices, list) {
65 if (pcm->internal)
66 continue;
67 if (pcm->card == card && pcm->device > device)
68 return pcm->device;
69 else if (pcm->card->number > card->number)
70 return -1;
71 }
72 return -1;
73}
74
75static int snd_pcm_add(struct snd_pcm *newpcm)
76{
77 struct snd_pcm *pcm;
78
79 list_for_each_entry(pcm, &snd_pcm_devices, list) {
80 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
81 return -EBUSY;
82 if (pcm->card->number > newpcm->card->number ||
83 (pcm->card == newpcm->card &&
84 pcm->device > newpcm->device)) {
85 list_add(&newpcm->list, pcm->list.prev);
86 return 0;
87 }
88 }
89 list_add_tail(&newpcm->list, &snd_pcm_devices);
90 return 0;
91}
92
93static int snd_pcm_control_ioctl(struct snd_card *card,
94 struct snd_ctl_file *control,
95 unsigned int cmd, unsigned long arg)
96{
97 switch (cmd) {
98 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
99 {
100 int device;
101
102 if (get_user(device, (int __user *)arg))
103 return -EFAULT;
104 mutex_lock(&register_mutex);
105 device = snd_pcm_next(card, device);
106 mutex_unlock(&register_mutex);
107 if (put_user(device, (int __user *)arg))
108 return -EFAULT;
109 return 0;
110 }
111 case SNDRV_CTL_IOCTL_PCM_INFO:
112 {
113 struct snd_pcm_info __user *info;
114 unsigned int device, subdevice;
115 int stream;
116 struct snd_pcm *pcm;
117 struct snd_pcm_str *pstr;
118 struct snd_pcm_substream *substream;
119 int err;
120
121 info = (struct snd_pcm_info __user *)arg;
122 if (get_user(device, &info->device))
123 return -EFAULT;
124 if (get_user(stream, &info->stream))
125 return -EFAULT;
126 if (stream < 0 || stream > 1)
127 return -EINVAL;
128 if (get_user(subdevice, &info->subdevice))
129 return -EFAULT;
130 mutex_lock(&register_mutex);
131 pcm = snd_pcm_get(card, device);
132 if (pcm == NULL) {
133 err = -ENXIO;
134 goto _error;
135 }
136 pstr = &pcm->streams[stream];
137 if (pstr->substream_count == 0) {
138 err = -ENOENT;
139 goto _error;
140 }
141 if (subdevice >= pstr->substream_count) {
142 err = -ENXIO;
143 goto _error;
144 }
145 for (substream = pstr->substream; substream;
146 substream = substream->next)
147 if (substream->number == (int)subdevice)
148 break;
149 if (substream == NULL) {
150 err = -ENXIO;
151 goto _error;
152 }
153 err = snd_pcm_info_user(substream, info);
154 _error:
155 mutex_unlock(&register_mutex);
156 return err;
157 }
158 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
159 {
160 int val;
161
162 if (get_user(val, (int __user *)arg))
163 return -EFAULT;
164 control->prefer_pcm_subdevice = val;
165 return 0;
166 }
167 }
168 return -ENOIOCTLCMD;
169}
170
171#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
172
173static char *snd_pcm_format_names[] = {
174 FORMAT(S8),
175 FORMAT(U8),
176 FORMAT(S16_LE),
177 FORMAT(S16_BE),
178 FORMAT(U16_LE),
179 FORMAT(U16_BE),
180 FORMAT(S24_LE),
181 FORMAT(S24_BE),
182 FORMAT(U24_LE),
183 FORMAT(U24_BE),
184 FORMAT(S32_LE),
185 FORMAT(S32_BE),
186 FORMAT(U32_LE),
187 FORMAT(U32_BE),
188 FORMAT(FLOAT_LE),
189 FORMAT(FLOAT_BE),
190 FORMAT(FLOAT64_LE),
191 FORMAT(FLOAT64_BE),
192 FORMAT(IEC958_SUBFRAME_LE),
193 FORMAT(IEC958_SUBFRAME_BE),
194 FORMAT(MU_LAW),
195 FORMAT(A_LAW),
196 FORMAT(IMA_ADPCM),
197 FORMAT(MPEG),
198 FORMAT(GSM),
199 FORMAT(SPECIAL),
200 FORMAT(S24_3LE),
201 FORMAT(S24_3BE),
202 FORMAT(U24_3LE),
203 FORMAT(U24_3BE),
204 FORMAT(S20_3LE),
205 FORMAT(S20_3BE),
206 FORMAT(U20_3LE),
207 FORMAT(U20_3BE),
208 FORMAT(S18_3LE),
209 FORMAT(S18_3BE),
210 FORMAT(U18_3LE),
211 FORMAT(U18_3BE),
212 FORMAT(G723_24),
213 FORMAT(G723_24_1B),
214 FORMAT(G723_40),
215 FORMAT(G723_40_1B),
216 FORMAT(DSD_U8),
217 FORMAT(DSD_U16_LE),
218};
219
220const char *snd_pcm_format_name(snd_pcm_format_t format)
221{
222 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
223 return "Unknown";
224 return snd_pcm_format_names[(__force unsigned int)format];
225}
226EXPORT_SYMBOL_GPL(snd_pcm_format_name);
227
228#ifdef CONFIG_SND_VERBOSE_PROCFS
229
230#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
231#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
232#define READY(v) [SNDRV_PCM_READY_##v] = #v
233#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
234#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
235#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
236#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
237#define START(v) [SNDRV_PCM_START_##v] = #v
238#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
239
240static char *snd_pcm_stream_names[] = {
241 STREAM(PLAYBACK),
242 STREAM(CAPTURE),
243};
244
245static char *snd_pcm_state_names[] = {
246 STATE(OPEN),
247 STATE(SETUP),
248 STATE(PREPARED),
249 STATE(RUNNING),
250 STATE(XRUN),
251 STATE(DRAINING),
252 STATE(PAUSED),
253 STATE(SUSPENDED),
254};
255
256static char *snd_pcm_access_names[] = {
257 ACCESS(MMAP_INTERLEAVED),
258 ACCESS(MMAP_NONINTERLEAVED),
259 ACCESS(MMAP_COMPLEX),
260 ACCESS(RW_INTERLEAVED),
261 ACCESS(RW_NONINTERLEAVED),
262};
263
264static char *snd_pcm_subformat_names[] = {
265 SUBFORMAT(STD),
266};
267
268static char *snd_pcm_tstamp_mode_names[] = {
269 TSTAMP(NONE),
270 TSTAMP(ENABLE),
271};
272
273static const char *snd_pcm_stream_name(int stream)
274{
275 return snd_pcm_stream_names[stream];
276}
277
278static const char *snd_pcm_access_name(snd_pcm_access_t access)
279{
280 return snd_pcm_access_names[(__force int)access];
281}
282
283static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
284{
285 return snd_pcm_subformat_names[(__force int)subformat];
286}
287
288static const char *snd_pcm_tstamp_mode_name(int mode)
289{
290 return snd_pcm_tstamp_mode_names[mode];
291}
292
293static const char *snd_pcm_state_name(snd_pcm_state_t state)
294{
295 return snd_pcm_state_names[(__force int)state];
296}
297
298#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
299#include <linux/soundcard.h>
300
301static const char *snd_pcm_oss_format_name(int format)
302{
303 switch (format) {
304 case AFMT_MU_LAW:
305 return "MU_LAW";
306 case AFMT_A_LAW:
307 return "A_LAW";
308 case AFMT_IMA_ADPCM:
309 return "IMA_ADPCM";
310 case AFMT_U8:
311 return "U8";
312 case AFMT_S16_LE:
313 return "S16_LE";
314 case AFMT_S16_BE:
315 return "S16_BE";
316 case AFMT_S8:
317 return "S8";
318 case AFMT_U16_LE:
319 return "U16_LE";
320 case AFMT_U16_BE:
321 return "U16_BE";
322 case AFMT_MPEG:
323 return "MPEG";
324 default:
325 return "unknown";
326 }
327}
328#endif
329
330static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
331 struct snd_info_buffer *buffer)
332{
333 struct snd_pcm_info *info;
334 int err;
335
336 if (! substream)
337 return;
338
339 info = kmalloc(sizeof(*info), GFP_KERNEL);
340 if (! info) {
341 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
342 return;
343 }
344
345 err = snd_pcm_info(substream, info);
346 if (err < 0) {
347 snd_iprintf(buffer, "error %d\n", err);
348 kfree(info);
349 return;
350 }
351 snd_iprintf(buffer, "card: %d\n", info->card);
352 snd_iprintf(buffer, "device: %d\n", info->device);
353 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
354 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
355 snd_iprintf(buffer, "id: %s\n", info->id);
356 snd_iprintf(buffer, "name: %s\n", info->name);
357 snd_iprintf(buffer, "subname: %s\n", info->subname);
358 snd_iprintf(buffer, "class: %d\n", info->dev_class);
359 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
360 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
361 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
362 kfree(info);
363}
364
365static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
367{
368 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
369 buffer);
370}
371
372static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
373 struct snd_info_buffer *buffer)
374{
375 snd_pcm_proc_info_read(entry->private_data, buffer);
376}
377
378static void snd_pcm_substream_proc_hw_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;
383
384 mutex_lock(&substream->pcm->open_mutex);
385 runtime = substream->runtime;
386 if (!runtime) {
387 snd_iprintf(buffer, "closed\n");
388 goto unlock;
389 }
390 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
391 snd_iprintf(buffer, "no setup\n");
392 goto unlock;
393 }
394 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
395 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
396 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
397 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
398 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
399 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
400 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
401#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
402 if (substream->oss.oss) {
403 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
404 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
405 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
406 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
407 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
408 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
409 }
410#endif
411 unlock:
412 mutex_unlock(&substream->pcm->open_mutex);
413}
414
415static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
416 struct snd_info_buffer *buffer)
417{
418 struct snd_pcm_substream *substream = entry->private_data;
419 struct snd_pcm_runtime *runtime;
420
421 mutex_lock(&substream->pcm->open_mutex);
422 runtime = substream->runtime;
423 if (!runtime) {
424 snd_iprintf(buffer, "closed\n");
425 goto unlock;
426 }
427 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
428 snd_iprintf(buffer, "no setup\n");
429 goto unlock;
430 }
431 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
432 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
433 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
434 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
435 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
436 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
437 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
438 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
439 unlock:
440 mutex_unlock(&substream->pcm->open_mutex);
441}
442
443static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
444 struct snd_info_buffer *buffer)
445{
446 struct snd_pcm_substream *substream = entry->private_data;
447 struct snd_pcm_runtime *runtime;
448 struct snd_pcm_status status;
449 int err;
450
451 mutex_lock(&substream->pcm->open_mutex);
452 runtime = substream->runtime;
453 if (!runtime) {
454 snd_iprintf(buffer, "closed\n");
455 goto unlock;
456 }
457 memset(&status, 0, sizeof(status));
458 err = snd_pcm_status(substream, &status);
459 if (err < 0) {
460 snd_iprintf(buffer, "error %d\n", err);
461 goto unlock;
462 }
463 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
464 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
465 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
466 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
467 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
468 status.tstamp.tv_sec, status.tstamp.tv_nsec);
469 snd_iprintf(buffer, "delay : %ld\n", status.delay);
470 snd_iprintf(buffer, "avail : %ld\n", status.avail);
471 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
472 snd_iprintf(buffer, "-----\n");
473 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
474 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
475 unlock:
476 mutex_unlock(&substream->pcm->open_mutex);
477}
478
479#ifdef CONFIG_SND_PCM_XRUN_DEBUG
480static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
481 struct snd_info_buffer *buffer)
482{
483 struct snd_pcm_str *pstr = entry->private_data;
484 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
485}
486
487static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
488 struct snd_info_buffer *buffer)
489{
490 struct snd_pcm_str *pstr = entry->private_data;
491 char line[64];
492 if (!snd_info_get_line(buffer, line, sizeof(line)))
493 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
494}
495#endif
496
497static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
498{
499 struct snd_pcm *pcm = pstr->pcm;
500 struct snd_info_entry *entry;
501 char name[16];
502
503 sprintf(name, "pcm%i%c", pcm->device,
504 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
505 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
506 return -ENOMEM;
507 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
508 if (snd_info_register(entry) < 0) {
509 snd_info_free_entry(entry);
510 return -ENOMEM;
511 }
512 pstr->proc_root = entry;
513
514 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
515 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
516 if (snd_info_register(entry) < 0) {
517 snd_info_free_entry(entry);
518 entry = NULL;
519 }
520 }
521 pstr->proc_info_entry = entry;
522
523#ifdef CONFIG_SND_PCM_XRUN_DEBUG
524 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
525 pstr->proc_root)) != NULL) {
526 entry->c.text.read = snd_pcm_xrun_debug_read;
527 entry->c.text.write = snd_pcm_xrun_debug_write;
528 entry->mode |= S_IWUSR;
529 entry->private_data = pstr;
530 if (snd_info_register(entry) < 0) {
531 snd_info_free_entry(entry);
532 entry = NULL;
533 }
534 }
535 pstr->proc_xrun_debug_entry = entry;
536#endif
537 return 0;
538}
539
540static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
541{
542#ifdef CONFIG_SND_PCM_XRUN_DEBUG
543 snd_info_free_entry(pstr->proc_xrun_debug_entry);
544 pstr->proc_xrun_debug_entry = NULL;
545#endif
546 snd_info_free_entry(pstr->proc_info_entry);
547 pstr->proc_info_entry = NULL;
548 snd_info_free_entry(pstr->proc_root);
549 pstr->proc_root = NULL;
550 return 0;
551}
552
553static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
554{
555 struct snd_info_entry *entry;
556 struct snd_card *card;
557 char name[16];
558
559 card = substream->pcm->card;
560
561 sprintf(name, "sub%i", substream->number);
562 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
563 return -ENOMEM;
564 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
565 if (snd_info_register(entry) < 0) {
566 snd_info_free_entry(entry);
567 return -ENOMEM;
568 }
569 substream->proc_root = entry;
570
571 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
572 snd_info_set_text_ops(entry, substream,
573 snd_pcm_substream_proc_info_read);
574 if (snd_info_register(entry) < 0) {
575 snd_info_free_entry(entry);
576 entry = NULL;
577 }
578 }
579 substream->proc_info_entry = entry;
580
581 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
582 snd_info_set_text_ops(entry, substream,
583 snd_pcm_substream_proc_hw_params_read);
584 if (snd_info_register(entry) < 0) {
585 snd_info_free_entry(entry);
586 entry = NULL;
587 }
588 }
589 substream->proc_hw_params_entry = entry;
590
591 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
592 snd_info_set_text_ops(entry, substream,
593 snd_pcm_substream_proc_sw_params_read);
594 if (snd_info_register(entry) < 0) {
595 snd_info_free_entry(entry);
596 entry = NULL;
597 }
598 }
599 substream->proc_sw_params_entry = entry;
600
601 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
602 snd_info_set_text_ops(entry, substream,
603 snd_pcm_substream_proc_status_read);
604 if (snd_info_register(entry) < 0) {
605 snd_info_free_entry(entry);
606 entry = NULL;
607 }
608 }
609 substream->proc_status_entry = entry;
610
611 return 0;
612}
613
614static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
615{
616 snd_info_free_entry(substream->proc_info_entry);
617 substream->proc_info_entry = NULL;
618 snd_info_free_entry(substream->proc_hw_params_entry);
619 substream->proc_hw_params_entry = NULL;
620 snd_info_free_entry(substream->proc_sw_params_entry);
621 substream->proc_sw_params_entry = NULL;
622 snd_info_free_entry(substream->proc_status_entry);
623 substream->proc_status_entry = NULL;
624 snd_info_free_entry(substream->proc_root);
625 substream->proc_root = NULL;
626 return 0;
627}
628#else /* !CONFIG_SND_VERBOSE_PROCFS */
629static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
630static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
631static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
632static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
633#endif /* CONFIG_SND_VERBOSE_PROCFS */
634
635/**
636 * snd_pcm_new_stream - create a new PCM stream
637 * @pcm: the pcm instance
638 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
639 * @substream_count: the number of substreams
640 *
641 * Creates a new stream for the pcm.
642 * The corresponding stream on the pcm must have been empty before
643 * calling this, i.e. zero must be given to the argument of
644 * snd_pcm_new().
645 *
646 * Return: Zero if successful, or a negative error code on failure.
647 */
648int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
649{
650 int idx, err;
651 struct snd_pcm_str *pstr = &pcm->streams[stream];
652 struct snd_pcm_substream *substream, *prev;
653
654#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
655 mutex_init(&pstr->oss.setup_mutex);
656#endif
657 pstr->stream = stream;
658 pstr->pcm = pcm;
659 pstr->substream_count = substream_count;
660 if (substream_count > 0 && !pcm->internal) {
661 err = snd_pcm_stream_proc_init(pstr);
662 if (err < 0) {
663 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
664 return err;
665 }
666 }
667 prev = NULL;
668 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
669 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
670 if (substream == NULL) {
671 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
672 return -ENOMEM;
673 }
674 substream->pcm = pcm;
675 substream->pstr = pstr;
676 substream->number = idx;
677 substream->stream = stream;
678 sprintf(substream->name, "subdevice #%i", idx);
679 substream->buffer_bytes_max = UINT_MAX;
680 if (prev == NULL)
681 pstr->substream = substream;
682 else
683 prev->next = substream;
684
685 if (!pcm->internal) {
686 err = snd_pcm_substream_proc_init(substream);
687 if (err < 0) {
688 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
689 if (prev == NULL)
690 pstr->substream = NULL;
691 else
692 prev->next = NULL;
693 kfree(substream);
694 return err;
695 }
696 }
697 substream->group = &substream->self_group;
698 spin_lock_init(&substream->self_group.lock);
699 INIT_LIST_HEAD(&substream->self_group.substreams);
700 list_add_tail(&substream->link_list, &substream->self_group.substreams);
701 atomic_set(&substream->mmap_count, 0);
702 prev = substream;
703 }
704 return 0;
705}
706
707EXPORT_SYMBOL(snd_pcm_new_stream);
708
709static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
710 int playback_count, int capture_count, bool internal,
711 struct snd_pcm **rpcm)
712{
713 struct snd_pcm *pcm;
714 int err;
715 static struct snd_device_ops ops = {
716 .dev_free = snd_pcm_dev_free,
717 .dev_register = snd_pcm_dev_register,
718 .dev_disconnect = snd_pcm_dev_disconnect,
719 };
720
721 if (snd_BUG_ON(!card))
722 return -ENXIO;
723 if (rpcm)
724 *rpcm = NULL;
725 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
726 if (pcm == NULL) {
727 snd_printk(KERN_ERR "Cannot allocate PCM\n");
728 return -ENOMEM;
729 }
730 pcm->card = card;
731 pcm->device = device;
732 pcm->internal = internal;
733 if (id)
734 strlcpy(pcm->id, id, sizeof(pcm->id));
735 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
736 snd_pcm_free(pcm);
737 return err;
738 }
739 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
740 snd_pcm_free(pcm);
741 return err;
742 }
743 mutex_init(&pcm->open_mutex);
744 init_waitqueue_head(&pcm->open_wait);
745 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
746 snd_pcm_free(pcm);
747 return err;
748 }
749 if (rpcm)
750 *rpcm = pcm;
751 return 0;
752}
753
754/**
755 * snd_pcm_new - create a new PCM instance
756 * @card: the card instance
757 * @id: the id string
758 * @device: the device index (zero based)
759 * @playback_count: the number of substreams for playback
760 * @capture_count: the number of substreams for capture
761 * @rpcm: the pointer to store the new pcm instance
762 *
763 * Creates a new PCM instance.
764 *
765 * The pcm operators have to be set afterwards to the new instance
766 * via snd_pcm_set_ops().
767 *
768 * Return: Zero if successful, or a negative error code on failure.
769 */
770int snd_pcm_new(struct snd_card *card, const char *id, int device,
771 int playback_count, int capture_count, struct snd_pcm **rpcm)
772{
773 return _snd_pcm_new(card, id, device, playback_count, capture_count,
774 false, rpcm);
775}
776EXPORT_SYMBOL(snd_pcm_new);
777
778/**
779 * snd_pcm_new_internal - create a new internal PCM instance
780 * @card: the card instance
781 * @id: the id string
782 * @device: the device index (zero based - shared with normal PCMs)
783 * @playback_count: the number of substreams for playback
784 * @capture_count: the number of substreams for capture
785 * @rpcm: the pointer to store the new pcm instance
786 *
787 * Creates a new internal PCM instance with no userspace device or procfs
788 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
789 * will only be used internally by kernel drivers. i.e. it cannot be opened
790 * by userspace. It provides existing ASoC components drivers with a substream
791 * and access to any private data.
792 *
793 * The pcm operators have to be set afterwards to the new instance
794 * via snd_pcm_set_ops().
795 *
796 * Return: Zero if successful, or a negative error code on failure.
797 */
798int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
799 int playback_count, int capture_count,
800 struct snd_pcm **rpcm)
801{
802 return _snd_pcm_new(card, id, device, playback_count, capture_count,
803 true, rpcm);
804}
805EXPORT_SYMBOL(snd_pcm_new_internal);
806
807static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
808{
809 struct snd_pcm_substream *substream, *substream_next;
810#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
811 struct snd_pcm_oss_setup *setup, *setupn;
812#endif
813 substream = pstr->substream;
814 while (substream) {
815 substream_next = substream->next;
816 snd_pcm_timer_done(substream);
817 snd_pcm_substream_proc_done(substream);
818 kfree(substream);
819 substream = substream_next;
820 }
821 snd_pcm_stream_proc_done(pstr);
822#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
823 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
824 setupn = setup->next;
825 kfree(setup->task_name);
826 kfree(setup);
827 }
828#endif
829}
830
831static int snd_pcm_free(struct snd_pcm *pcm)
832{
833 struct snd_pcm_notify *notify;
834
835 if (!pcm)
836 return 0;
837 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
838 notify->n_unregister(pcm);
839 }
840 if (pcm->private_free)
841 pcm->private_free(pcm);
842 snd_pcm_lib_preallocate_free_for_all(pcm);
843 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
844 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
845 kfree(pcm);
846 return 0;
847}
848
849static int snd_pcm_dev_free(struct snd_device *device)
850{
851 struct snd_pcm *pcm = device->device_data;
852 return snd_pcm_free(pcm);
853}
854
855int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
856 struct file *file,
857 struct snd_pcm_substream **rsubstream)
858{
859 struct snd_pcm_str * pstr;
860 struct snd_pcm_substream *substream;
861 struct snd_pcm_runtime *runtime;
862 struct snd_ctl_file *kctl;
863 struct snd_card *card;
864 int prefer_subdevice = -1;
865 size_t size;
866
867 if (snd_BUG_ON(!pcm || !rsubstream))
868 return -ENXIO;
869 *rsubstream = NULL;
870 pstr = &pcm->streams[stream];
871 if (pstr->substream == NULL || pstr->substream_count == 0)
872 return -ENODEV;
873
874 card = pcm->card;
875 read_lock(&card->ctl_files_rwlock);
876 list_for_each_entry(kctl, &card->ctl_files, list) {
877 if (kctl->pid == task_pid(current)) {
878 prefer_subdevice = kctl->prefer_pcm_subdevice;
879 if (prefer_subdevice != -1)
880 break;
881 }
882 }
883 read_unlock(&card->ctl_files_rwlock);
884
885 switch (stream) {
886 case SNDRV_PCM_STREAM_PLAYBACK:
887 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
888 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
889 if (SUBSTREAM_BUSY(substream))
890 return -EAGAIN;
891 }
892 }
893 break;
894 case SNDRV_PCM_STREAM_CAPTURE:
895 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
896 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
897 if (SUBSTREAM_BUSY(substream))
898 return -EAGAIN;
899 }
900 }
901 break;
902 default:
903 return -EINVAL;
904 }
905
906 if (file->f_flags & O_APPEND) {
907 if (prefer_subdevice < 0) {
908 if (pstr->substream_count > 1)
909 return -EINVAL; /* must be unique */
910 substream = pstr->substream;
911 } else {
912 for (substream = pstr->substream; substream;
913 substream = substream->next)
914 if (substream->number == prefer_subdevice)
915 break;
916 }
917 if (! substream)
918 return -ENODEV;
919 if (! SUBSTREAM_BUSY(substream))
920 return -EBADFD;
921 substream->ref_count++;
922 *rsubstream = substream;
923 return 0;
924 }
925
926 if (prefer_subdevice >= 0) {
927 for (substream = pstr->substream; substream; substream = substream->next)
928 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
929 goto __ok;
930 }
931 for (substream = pstr->substream; substream; substream = substream->next)
932 if (!SUBSTREAM_BUSY(substream))
933 break;
934 __ok:
935 if (substream == NULL)
936 return -EAGAIN;
937
938 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
939 if (runtime == NULL)
940 return -ENOMEM;
941
942 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
943 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
944 if (runtime->status == NULL) {
945 kfree(runtime);
946 return -ENOMEM;
947 }
948 memset((void*)runtime->status, 0, size);
949
950 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
951 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
952 if (runtime->control == NULL) {
953 snd_free_pages((void*)runtime->status,
954 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
955 kfree(runtime);
956 return -ENOMEM;
957 }
958 memset((void*)runtime->control, 0, size);
959
960 init_waitqueue_head(&runtime->sleep);
961 init_waitqueue_head(&runtime->tsleep);
962
963 runtime->status->state = SNDRV_PCM_STATE_OPEN;
964
965 substream->runtime = runtime;
966 substream->private_data = pcm->private_data;
967 substream->ref_count = 1;
968 substream->f_flags = file->f_flags;
969 substream->pid = get_pid(task_pid(current));
970 pstr->substream_opened++;
971 *rsubstream = substream;
972 return 0;
973}
974
975void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
976{
977 struct snd_pcm_runtime *runtime;
978
979 if (PCM_RUNTIME_CHECK(substream))
980 return;
981 runtime = substream->runtime;
982 if (runtime->private_free != NULL)
983 runtime->private_free(runtime);
984 snd_free_pages((void*)runtime->status,
985 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
986 snd_free_pages((void*)runtime->control,
987 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
988 kfree(runtime->hw_constraints.rules);
989#ifdef CONFIG_SND_PCM_XRUN_DEBUG
990 kfree(runtime->hwptr_log);
991#endif
992 kfree(runtime);
993 substream->runtime = NULL;
994 put_pid(substream->pid);
995 substream->pid = NULL;
996 substream->pstr->substream_opened--;
997}
998
999static ssize_t show_pcm_class(struct device *dev,
1000 struct device_attribute *attr, char *buf)
1001{
1002 struct snd_pcm *pcm;
1003 const char *str;
1004 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1005 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1006 [SNDRV_PCM_CLASS_MULTI] = "multi",
1007 [SNDRV_PCM_CLASS_MODEM] = "modem",
1008 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1009 };
1010
1011 if (! (pcm = dev_get_drvdata(dev)) ||
1012 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1013 str = "none";
1014 else
1015 str = strs[pcm->dev_class];
1016 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1017}
1018
1019static struct device_attribute pcm_attrs =
1020 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1021
1022static int snd_pcm_dev_register(struct snd_device *device)
1023{
1024 int cidx, err;
1025 struct snd_pcm_substream *substream;
1026 struct snd_pcm_notify *notify;
1027 char str[16];
1028 struct snd_pcm *pcm;
1029 struct device *dev;
1030
1031 if (snd_BUG_ON(!device || !device->device_data))
1032 return -ENXIO;
1033 pcm = device->device_data;
1034 mutex_lock(&register_mutex);
1035 err = snd_pcm_add(pcm);
1036 if (err) {
1037 mutex_unlock(&register_mutex);
1038 return err;
1039 }
1040 for (cidx = 0; cidx < 2; cidx++) {
1041 int devtype = -1;
1042 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1043 continue;
1044 switch (cidx) {
1045 case SNDRV_PCM_STREAM_PLAYBACK:
1046 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1047 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1048 break;
1049 case SNDRV_PCM_STREAM_CAPTURE:
1050 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1051 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1052 break;
1053 }
1054 /* device pointer to use, pcm->dev takes precedence if
1055 * it is assigned, otherwise fall back to card's device
1056 * if possible */
1057 dev = pcm->dev;
1058 if (!dev)
1059 dev = snd_card_get_device_link(pcm->card);
1060 /* register pcm */
1061 err = snd_register_device_for_dev(devtype, pcm->card,
1062 pcm->device,
1063 &snd_pcm_f_ops[cidx],
1064 pcm, str, dev);
1065 if (err < 0) {
1066 list_del(&pcm->list);
1067 mutex_unlock(&register_mutex);
1068 return err;
1069 }
1070 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1071 &pcm_attrs);
1072 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1073 snd_pcm_timer_init(substream);
1074 }
1075
1076 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1077 notify->n_register(pcm);
1078
1079 mutex_unlock(&register_mutex);
1080 return 0;
1081}
1082
1083static int snd_pcm_dev_disconnect(struct snd_device *device)
1084{
1085 struct snd_pcm *pcm = device->device_data;
1086 struct snd_pcm_notify *notify;
1087 struct snd_pcm_substream *substream;
1088 int cidx, devtype;
1089
1090 mutex_lock(&register_mutex);
1091 if (list_empty(&pcm->list))
1092 goto unlock;
1093
1094 mutex_lock(&pcm->open_mutex);
1095 wake_up(&pcm->open_wait);
1096 list_del_init(&pcm->list);
1097 for (cidx = 0; cidx < 2; cidx++)
1098 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1099 snd_pcm_stream_lock_irq(substream);
1100 if (substream->runtime) {
1101 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1102 wake_up(&substream->runtime->sleep);
1103 wake_up(&substream->runtime->tsleep);
1104 }
1105 snd_pcm_stream_unlock_irq(substream);
1106 }
1107 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1108 notify->n_disconnect(pcm);
1109 }
1110 for (cidx = 0; cidx < 2; cidx++) {
1111 devtype = -1;
1112 switch (cidx) {
1113 case SNDRV_PCM_STREAM_PLAYBACK:
1114 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1115 break;
1116 case SNDRV_PCM_STREAM_CAPTURE:
1117 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1118 break;
1119 }
1120 snd_unregister_device(devtype, pcm->card, pcm->device);
1121 if (pcm->streams[cidx].chmap_kctl) {
1122 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1123 pcm->streams[cidx].chmap_kctl = NULL;
1124 }
1125 }
1126 mutex_unlock(&pcm->open_mutex);
1127 unlock:
1128 mutex_unlock(&register_mutex);
1129 return 0;
1130}
1131
1132int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1133{
1134 struct snd_pcm *pcm;
1135
1136 if (snd_BUG_ON(!notify ||
1137 !notify->n_register ||
1138 !notify->n_unregister ||
1139 !notify->n_disconnect))
1140 return -EINVAL;
1141 mutex_lock(&register_mutex);
1142 if (nfree) {
1143 list_del(&notify->list);
1144 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145 notify->n_unregister(pcm);
1146 } else {
1147 list_add_tail(&notify->list, &snd_pcm_notify_list);
1148 list_for_each_entry(pcm, &snd_pcm_devices, list)
1149 notify->n_register(pcm);
1150 }
1151 mutex_unlock(&register_mutex);
1152 return 0;
1153}
1154
1155EXPORT_SYMBOL(snd_pcm_notify);
1156
1157#ifdef CONFIG_PROC_FS
1158/*
1159 * Info interface
1160 */
1161
1162static void snd_pcm_proc_read(struct snd_info_entry *entry,
1163 struct snd_info_buffer *buffer)
1164{
1165 struct snd_pcm *pcm;
1166
1167 mutex_lock(&register_mutex);
1168 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1169 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1170 pcm->card->number, pcm->device, pcm->id, pcm->name);
1171 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1172 snd_iprintf(buffer, " : playback %i",
1173 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1174 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1175 snd_iprintf(buffer, " : capture %i",
1176 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1177 snd_iprintf(buffer, "\n");
1178 }
1179 mutex_unlock(&register_mutex);
1180}
1181
1182static struct snd_info_entry *snd_pcm_proc_entry;
1183
1184static void snd_pcm_proc_init(void)
1185{
1186 struct snd_info_entry *entry;
1187
1188 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1189 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1190 if (snd_info_register(entry) < 0) {
1191 snd_info_free_entry(entry);
1192 entry = NULL;
1193 }
1194 }
1195 snd_pcm_proc_entry = entry;
1196}
1197
1198static void snd_pcm_proc_done(void)
1199{
1200 snd_info_free_entry(snd_pcm_proc_entry);
1201}
1202
1203#else /* !CONFIG_PROC_FS */
1204#define snd_pcm_proc_init()
1205#define snd_pcm_proc_done()
1206#endif /* CONFIG_PROC_FS */
1207
1208
1209/*
1210 * ENTRY functions
1211 */
1212
1213static int __init alsa_pcm_init(void)
1214{
1215 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1216 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1217 snd_pcm_proc_init();
1218 return 0;
1219}
1220
1221static void __exit alsa_pcm_exit(void)
1222{
1223 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1224 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1225 snd_pcm_proc_done();
1226}
1227
1228module_init(alsa_pcm_init)
1229module_exit(alsa_pcm_exit)
Linux kernel - Deliverables
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