2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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.
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.
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
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/pcm.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
35 MODULE_LICENSE("GPL");
37 static LIST_HEAD(snd_pcm_devices);
38 static LIST_HEAD(snd_pcm_notify_list);
39 static DEFINE_MUTEX(register_mutex);
41 static int snd_pcm_free(struct snd_pcm *pcm);
42 static int snd_pcm_dev_free(struct snd_device *device);
43 static int snd_pcm_dev_register(struct snd_device *device);
44 static int snd_pcm_dev_disconnect(struct snd_device *device);
46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
51 list_for_each(p, &snd_pcm_devices) {
52 pcm = list_entry(p, struct snd_pcm, list);
53 if (pcm->card == card && pcm->device == device)
59 static int snd_pcm_control_ioctl(struct snd_card *card,
60 struct snd_ctl_file *control,
61 unsigned int cmd, unsigned long arg)
64 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
68 if (get_user(device, (int __user *)arg))
70 mutex_lock(®ister_mutex);
71 device = device < 0 ? 0 : device + 1;
72 while (device < SNDRV_PCM_DEVICES) {
73 if (snd_pcm_search(card, device))
77 if (device == SNDRV_PCM_DEVICES)
79 mutex_unlock(®ister_mutex);
80 if (put_user(device, (int __user *)arg))
84 case SNDRV_CTL_IOCTL_PCM_INFO:
86 struct snd_pcm_info __user *info;
87 unsigned int device, subdevice;
90 struct snd_pcm_str *pstr;
91 struct snd_pcm_substream *substream;
94 info = (struct snd_pcm_info __user *)arg;
95 if (get_user(device, &info->device))
97 if (get_user(stream, &info->stream))
99 if (stream < 0 || stream > 1)
101 if (get_user(subdevice, &info->subdevice))
103 mutex_lock(®ister_mutex);
104 pcm = snd_pcm_search(card, device);
109 pstr = &pcm->streams[stream];
110 if (pstr->substream_count == 0) {
114 if (subdevice >= pstr->substream_count) {
118 for (substream = pstr->substream; substream;
119 substream = substream->next)
120 if (substream->number == (int)subdevice)
122 if (substream == NULL) {
126 err = snd_pcm_info_user(substream, info);
128 mutex_unlock(®ister_mutex);
131 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
135 if (get_user(val, (int __user *)arg))
137 control->prefer_pcm_subdevice = val;
144 #ifdef CONFIG_SND_VERBOSE_PROCFS
146 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
147 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
148 #define READY(v) [SNDRV_PCM_READY_##v] = #v
149 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
150 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
151 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
152 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
153 #define START(v) [SNDRV_PCM_START_##v] = #v
154 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
155 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
157 static char *snd_pcm_format_names[] = {
176 FORMAT(IEC958_SUBFRAME_LE),
177 FORMAT(IEC958_SUBFRAME_BE),
198 static const char *snd_pcm_format_name(snd_pcm_format_t format)
200 return snd_pcm_format_names[format];
203 static char *snd_pcm_stream_names[] = {
208 static char *snd_pcm_state_names[] = {
219 static char *snd_pcm_access_names[] = {
220 ACCESS(MMAP_INTERLEAVED),
221 ACCESS(MMAP_NONINTERLEAVED),
222 ACCESS(MMAP_COMPLEX),
223 ACCESS(RW_INTERLEAVED),
224 ACCESS(RW_NONINTERLEAVED),
227 static char *snd_pcm_subformat_names[] = {
231 static char *snd_pcm_tstamp_mode_names[] = {
236 static const char *snd_pcm_stream_name(int stream)
238 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
239 return snd_pcm_stream_names[stream];
242 static const char *snd_pcm_access_name(snd_pcm_access_t access)
244 return snd_pcm_access_names[access];
247 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
249 return snd_pcm_subformat_names[subformat];
252 static const char *snd_pcm_tstamp_mode_name(int mode)
254 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
255 return snd_pcm_tstamp_mode_names[mode];
258 static const char *snd_pcm_state_name(snd_pcm_state_t state)
260 return snd_pcm_state_names[state];
263 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
264 #include <linux/soundcard.h>
266 static const char *snd_pcm_oss_format_name(int format)
295 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
296 struct snd_info_buffer *buffer)
298 struct snd_pcm_info *info;
304 info = kmalloc(sizeof(*info), GFP_KERNEL);
306 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
310 err = snd_pcm_info(substream, info);
312 snd_iprintf(buffer, "error %d\n", err);
316 snd_iprintf(buffer, "card: %d\n", info->card);
317 snd_iprintf(buffer, "device: %d\n", info->device);
318 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
319 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
320 snd_iprintf(buffer, "id: %s\n", info->id);
321 snd_iprintf(buffer, "name: %s\n", info->name);
322 snd_iprintf(buffer, "subname: %s\n", info->subname);
323 snd_iprintf(buffer, "class: %d\n", info->dev_class);
324 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
325 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
326 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
330 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
331 struct snd_info_buffer *buffer)
333 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
337 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
338 struct snd_info_buffer *buffer)
340 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
344 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
345 struct snd_info_buffer *buffer)
347 struct snd_pcm_substream *substream = entry->private_data;
348 struct snd_pcm_runtime *runtime = substream->runtime;
350 snd_iprintf(buffer, "closed\n");
353 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
354 snd_iprintf(buffer, "no setup\n");
357 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
358 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
359 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
360 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
361 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
362 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
363 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
364 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
365 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
366 if (substream->oss.oss) {
367 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
368 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
369 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
370 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
371 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
372 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
378 struct snd_info_buffer *buffer)
380 struct snd_pcm_substream *substream = entry->private_data;
381 struct snd_pcm_runtime *runtime = substream->runtime;
383 snd_iprintf(buffer, "closed\n");
386 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
387 snd_iprintf(buffer, "no setup\n");
390 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
391 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
392 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
393 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
394 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
395 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
396 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
397 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
398 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
399 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
402 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
403 struct snd_info_buffer *buffer)
405 struct snd_pcm_substream *substream = entry->private_data;
406 struct snd_pcm_runtime *runtime = substream->runtime;
407 struct snd_pcm_status status;
410 snd_iprintf(buffer, "closed\n");
413 memset(&status, 0, sizeof(status));
414 err = snd_pcm_status(substream, &status);
416 snd_iprintf(buffer, "error %d\n", err);
419 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
420 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
421 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
422 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
423 status.tstamp.tv_sec, status.tstamp.tv_nsec);
424 snd_iprintf(buffer, "delay : %ld\n", status.delay);
425 snd_iprintf(buffer, "avail : %ld\n", status.avail);
426 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
427 snd_iprintf(buffer, "-----\n");
428 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
429 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
432 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
433 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
434 struct snd_info_buffer *buffer)
436 struct snd_pcm_str *pstr = entry->private_data;
437 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
440 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
441 struct snd_info_buffer *buffer)
443 struct snd_pcm_str *pstr = entry->private_data;
445 if (!snd_info_get_line(buffer, line, sizeof(line)))
446 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
450 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
452 struct snd_pcm *pcm = pstr->pcm;
453 struct snd_info_entry *entry;
456 sprintf(name, "pcm%i%c", pcm->device,
457 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
458 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
460 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
461 if (snd_info_register(entry) < 0) {
462 snd_info_free_entry(entry);
465 pstr->proc_root = entry;
467 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
468 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
469 if (snd_info_register(entry) < 0) {
470 snd_info_free_entry(entry);
474 pstr->proc_info_entry = entry;
476 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
477 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
478 pstr->proc_root)) != NULL) {
479 entry->c.text.read = snd_pcm_xrun_debug_read;
480 entry->c.text.write = snd_pcm_xrun_debug_write;
481 entry->mode |= S_IWUSR;
482 entry->private_data = pstr;
483 if (snd_info_register(entry) < 0) {
484 snd_info_free_entry(entry);
488 pstr->proc_xrun_debug_entry = entry;
493 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
495 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
496 snd_info_free_entry(pstr->proc_xrun_debug_entry);
497 pstr->proc_xrun_debug_entry = NULL;
499 snd_info_free_entry(pstr->proc_info_entry);
500 pstr->proc_info_entry = NULL;
501 snd_info_free_entry(pstr->proc_root);
502 pstr->proc_root = NULL;
506 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
508 struct snd_info_entry *entry;
509 struct snd_card *card;
512 card = substream->pcm->card;
514 sprintf(name, "sub%i", substream->number);
515 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
517 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
518 if (snd_info_register(entry) < 0) {
519 snd_info_free_entry(entry);
522 substream->proc_root = entry;
524 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
525 snd_info_set_text_ops(entry, substream,
526 snd_pcm_substream_proc_info_read);
527 if (snd_info_register(entry) < 0) {
528 snd_info_free_entry(entry);
532 substream->proc_info_entry = entry;
534 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
535 snd_info_set_text_ops(entry, substream,
536 snd_pcm_substream_proc_hw_params_read);
537 if (snd_info_register(entry) < 0) {
538 snd_info_free_entry(entry);
542 substream->proc_hw_params_entry = entry;
544 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
545 snd_info_set_text_ops(entry, substream,
546 snd_pcm_substream_proc_sw_params_read);
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
552 substream->proc_sw_params_entry = entry;
554 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
555 snd_info_set_text_ops(entry, substream,
556 snd_pcm_substream_proc_status_read);
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
562 substream->proc_status_entry = entry;
567 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
569 snd_info_free_entry(substream->proc_info_entry);
570 substream->proc_info_entry = NULL;
571 snd_info_free_entry(substream->proc_hw_params_entry);
572 substream->proc_hw_params_entry = NULL;
573 snd_info_free_entry(substream->proc_sw_params_entry);
574 substream->proc_sw_params_entry = NULL;
575 snd_info_free_entry(substream->proc_status_entry);
576 substream->proc_status_entry = NULL;
577 snd_info_free_entry(substream->proc_root);
578 substream->proc_root = NULL;
581 #else /* !CONFIG_SND_VERBOSE_PROCFS */
582 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
583 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
584 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
585 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
586 #endif /* CONFIG_SND_VERBOSE_PROCFS */
589 * snd_pcm_new_stream - create a new PCM stream
590 * @pcm: the pcm instance
591 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
592 * @substream_count: the number of substreams
594 * Creates a new stream for the pcm.
595 * The corresponding stream on the pcm must have been empty before
596 * calling this, i.e. zero must be given to the argument of
599 * Returns zero if successful, or a negative error code on failure.
601 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
604 struct snd_pcm_str *pstr = &pcm->streams[stream];
605 struct snd_pcm_substream *substream, *prev;
607 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
608 mutex_init(&pstr->oss.setup_mutex);
610 pstr->stream = stream;
612 pstr->substream_count = substream_count;
613 if (substream_count > 0) {
614 err = snd_pcm_stream_proc_init(pstr);
616 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
621 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
622 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
623 if (substream == NULL) {
624 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
627 substream->pcm = pcm;
628 substream->pstr = pstr;
629 substream->number = idx;
630 substream->stream = stream;
631 sprintf(substream->name, "subdevice #%i", idx);
632 substream->buffer_bytes_max = UINT_MAX;
634 pstr->substream = substream;
636 prev->next = substream;
637 err = snd_pcm_substream_proc_init(substream);
639 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
643 substream->group = &substream->self_group;
644 spin_lock_init(&substream->self_group.lock);
645 INIT_LIST_HEAD(&substream->self_group.substreams);
646 list_add_tail(&substream->link_list, &substream->self_group.substreams);
647 spin_lock_init(&substream->timer_lock);
648 atomic_set(&substream->mmap_count, 0);
654 EXPORT_SYMBOL(snd_pcm_new_stream);
657 * snd_pcm_new - create a new PCM instance
658 * @card: the card instance
660 * @device: the device index (zero based)
661 * @playback_count: the number of substreams for playback
662 * @capture_count: the number of substreams for capture
663 * @rpcm: the pointer to store the new pcm instance
665 * Creates a new PCM instance.
667 * The pcm operators have to be set afterwards to the new instance
668 * via snd_pcm_set_ops().
670 * Returns zero if successful, or a negative error code on failure.
672 int snd_pcm_new(struct snd_card *card, char *id, int device,
673 int playback_count, int capture_count,
674 struct snd_pcm ** rpcm)
678 static struct snd_device_ops ops = {
679 .dev_free = snd_pcm_dev_free,
680 .dev_register = snd_pcm_dev_register,
681 .dev_disconnect = snd_pcm_dev_disconnect,
684 snd_assert(rpcm != NULL, return -EINVAL);
686 snd_assert(card != NULL, return -ENXIO);
687 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
689 snd_printk(KERN_ERR "Cannot allocate PCM\n");
693 pcm->device = device;
695 strlcpy(pcm->id, id, sizeof(pcm->id));
696 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
700 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
704 mutex_init(&pcm->open_mutex);
705 init_waitqueue_head(&pcm->open_wait);
706 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
714 EXPORT_SYMBOL(snd_pcm_new);
716 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
718 struct snd_pcm_substream *substream, *substream_next;
719 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
720 struct snd_pcm_oss_setup *setup, *setupn;
722 substream = pstr->substream;
724 substream_next = substream->next;
725 snd_pcm_timer_done(substream);
726 snd_pcm_substream_proc_done(substream);
728 substream = substream_next;
730 snd_pcm_stream_proc_done(pstr);
731 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
732 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
733 setupn = setup->next;
734 kfree(setup->task_name);
740 static int snd_pcm_free(struct snd_pcm *pcm)
742 struct snd_pcm_notify *notify;
744 snd_assert(pcm != NULL, return -ENXIO);
745 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
746 notify->n_unregister(pcm);
748 if (pcm->private_free)
749 pcm->private_free(pcm);
750 snd_pcm_lib_preallocate_free_for_all(pcm);
751 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
752 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
757 static int snd_pcm_dev_free(struct snd_device *device)
759 struct snd_pcm *pcm = device->device_data;
760 return snd_pcm_free(pcm);
763 static void snd_pcm_tick_timer_func(unsigned long data)
765 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
766 snd_pcm_tick_elapsed(substream);
769 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
771 struct snd_pcm_substream **rsubstream)
773 struct snd_pcm_str * pstr;
774 struct snd_pcm_substream *substream;
775 struct snd_pcm_runtime *runtime;
776 struct snd_ctl_file *kctl;
777 struct snd_card *card;
778 struct list_head *list;
779 int prefer_subdevice = -1;
782 snd_assert(rsubstream != NULL, return -EINVAL);
784 snd_assert(pcm != NULL, return -ENXIO);
785 pstr = &pcm->streams[stream];
786 if (pstr->substream == NULL || pstr->substream_count == 0)
790 down_read(&card->controls_rwsem);
791 list_for_each(list, &card->ctl_files) {
792 kctl = snd_ctl_file(list);
793 if (kctl->pid == current->pid) {
794 prefer_subdevice = kctl->prefer_pcm_subdevice;
795 if (prefer_subdevice != -1)
799 up_read(&card->controls_rwsem);
802 case SNDRV_PCM_STREAM_PLAYBACK:
803 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
804 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
805 if (SUBSTREAM_BUSY(substream))
810 case SNDRV_PCM_STREAM_CAPTURE:
811 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
812 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
813 if (SUBSTREAM_BUSY(substream))
822 if (file->f_flags & O_APPEND) {
823 if (prefer_subdevice < 0) {
824 if (pstr->substream_count > 1)
825 return -EINVAL; /* must be unique */
826 substream = pstr->substream;
828 for (substream = pstr->substream; substream;
829 substream = substream->next)
830 if (substream->number == prefer_subdevice)
835 if (! SUBSTREAM_BUSY(substream))
837 substream->ref_count++;
838 *rsubstream = substream;
842 if (prefer_subdevice >= 0) {
843 for (substream = pstr->substream; substream; substream = substream->next)
844 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
847 for (substream = pstr->substream; substream; substream = substream->next)
848 if (!SUBSTREAM_BUSY(substream))
851 if (substream == NULL)
854 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
858 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
859 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
860 if (runtime->status == NULL) {
864 memset((void*)runtime->status, 0, size);
866 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
867 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
868 if (runtime->control == NULL) {
869 snd_free_pages((void*)runtime->status,
870 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
874 memset((void*)runtime->control, 0, size);
876 init_waitqueue_head(&runtime->sleep);
877 init_timer(&runtime->tick_timer);
878 runtime->tick_timer.function = snd_pcm_tick_timer_func;
879 runtime->tick_timer.data = (unsigned long) substream;
881 runtime->status->state = SNDRV_PCM_STATE_OPEN;
883 substream->runtime = runtime;
884 substream->private_data = pcm->private_data;
885 substream->ref_count = 1;
886 substream->f_flags = file->f_flags;
887 pstr->substream_opened++;
888 *rsubstream = substream;
892 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
894 struct snd_pcm_runtime *runtime;
896 runtime = substream->runtime;
897 snd_assert(runtime != NULL, return);
898 if (runtime->private_free != NULL)
899 runtime->private_free(runtime);
900 snd_free_pages((void*)runtime->status,
901 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
902 snd_free_pages((void*)runtime->control,
903 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
904 kfree(runtime->hw_constraints.rules);
906 substream->runtime = NULL;
907 substream->pstr->substream_opened--;
910 static ssize_t show_pcm_class(struct class_device *class_device, char *buf)
914 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
915 [SNDRV_PCM_CLASS_GENERIC] = "generic",
916 [SNDRV_PCM_CLASS_MULTI] = "multi",
917 [SNDRV_PCM_CLASS_MODEM] = "modem",
918 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
921 if (! (pcm = class_get_devdata(class_device)) ||
922 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
925 str = strs[pcm->dev_class];
926 return snprintf(buf, PAGE_SIZE, "%s\n", str);
929 static struct class_device_attribute pcm_attrs =
930 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
932 static int snd_pcm_dev_register(struct snd_device *device)
935 struct snd_pcm_substream *substream;
936 struct list_head *list;
938 struct snd_pcm *pcm = device->device_data;
940 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
941 mutex_lock(®ister_mutex);
942 if (snd_pcm_search(pcm->card, pcm->device)) {
943 mutex_unlock(®ister_mutex);
946 list_add_tail(&pcm->list, &snd_pcm_devices);
947 for (cidx = 0; cidx < 2; cidx++) {
949 if (pcm->streams[cidx].substream == NULL)
952 case SNDRV_PCM_STREAM_PLAYBACK:
953 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
954 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
956 case SNDRV_PCM_STREAM_CAPTURE:
957 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
958 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
961 if ((err = snd_register_device(devtype, pcm->card,
963 &snd_pcm_f_ops[cidx],
966 list_del(&pcm->list);
967 mutex_unlock(®ister_mutex);
970 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
972 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
973 snd_pcm_timer_init(substream);
975 list_for_each(list, &snd_pcm_notify_list) {
976 struct snd_pcm_notify *notify;
977 notify = list_entry(list, struct snd_pcm_notify, list);
978 notify->n_register(pcm);
980 mutex_unlock(®ister_mutex);
984 static int snd_pcm_dev_disconnect(struct snd_device *device)
986 struct snd_pcm *pcm = device->device_data;
987 struct snd_pcm_notify *notify;
988 struct snd_pcm_substream *substream;
991 mutex_lock(®ister_mutex);
992 if (list_empty(&pcm->list))
995 list_del_init(&pcm->list);
996 for (cidx = 0; cidx < 2; cidx++)
997 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
998 if (substream->runtime)
999 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1000 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1001 notify->n_disconnect(pcm);
1003 for (cidx = 0; cidx < 2; cidx++) {
1006 case SNDRV_PCM_STREAM_PLAYBACK:
1007 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1009 case SNDRV_PCM_STREAM_CAPTURE:
1010 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1013 snd_unregister_device(devtype, pcm->card, pcm->device);
1016 mutex_unlock(®ister_mutex);
1020 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1022 struct list_head *p;
1024 snd_assert(notify != NULL &&
1025 notify->n_register != NULL &&
1026 notify->n_unregister != NULL &&
1027 notify->n_disconnect, return -EINVAL);
1028 mutex_lock(®ister_mutex);
1030 list_del(¬ify->list);
1031 list_for_each(p, &snd_pcm_devices)
1032 notify->n_unregister(list_entry(p,
1033 struct snd_pcm, list));
1035 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1036 list_for_each(p, &snd_pcm_devices)
1037 notify->n_register(list_entry(p, struct snd_pcm, list));
1039 mutex_unlock(®ister_mutex);
1043 EXPORT_SYMBOL(snd_pcm_notify);
1045 #ifdef CONFIG_PROC_FS
1050 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1051 struct snd_info_buffer *buffer)
1053 struct list_head *p;
1054 struct snd_pcm *pcm;
1056 mutex_lock(®ister_mutex);
1057 list_for_each(p, &snd_pcm_devices) {
1058 pcm = list_entry(p, struct snd_pcm, list);
1059 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1060 pcm->card->number, pcm->device, pcm->id, pcm->name);
1061 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1062 snd_iprintf(buffer, " : playback %i",
1063 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1064 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1065 snd_iprintf(buffer, " : capture %i",
1066 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1067 snd_iprintf(buffer, "\n");
1069 mutex_unlock(®ister_mutex);
1072 static struct snd_info_entry *snd_pcm_proc_entry;
1074 static void snd_pcm_proc_init(void)
1076 struct snd_info_entry *entry;
1078 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1079 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1080 if (snd_info_register(entry) < 0) {
1081 snd_info_free_entry(entry);
1085 snd_pcm_proc_entry = entry;
1088 static void snd_pcm_proc_done(void)
1090 snd_info_free_entry(snd_pcm_proc_entry);
1093 #else /* !CONFIG_PROC_FS */
1094 #define snd_pcm_proc_init()
1095 #define snd_pcm_proc_done()
1096 #endif /* CONFIG_PROC_FS */
1103 static int __init alsa_pcm_init(void)
1105 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1106 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1107 snd_pcm_proc_init();
1111 static void __exit alsa_pcm_exit(void)
1113 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1114 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1115 snd_pcm_proc_done();
1118 module_init(alsa_pcm_init)
1119 module_exit(alsa_pcm_exit)