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);
45 static int snd_pcm_dev_unregister(struct snd_device *device);
47 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
52 list_for_each(p, &snd_pcm_devices) {
53 pcm = list_entry(p, struct snd_pcm, list);
54 if (pcm->card == card && pcm->device == device)
60 static int snd_pcm_control_ioctl(struct snd_card *card,
61 struct snd_ctl_file *control,
62 unsigned int cmd, unsigned long arg)
65 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
69 if (get_user(device, (int __user *)arg))
71 mutex_lock(®ister_mutex);
72 device = device < 0 ? 0 : device + 1;
73 while (device < SNDRV_PCM_DEVICES) {
74 if (snd_pcm_search(card, device))
78 if (device == SNDRV_PCM_DEVICES)
80 mutex_unlock(®ister_mutex);
81 if (put_user(device, (int __user *)arg))
85 case SNDRV_CTL_IOCTL_PCM_INFO:
87 struct snd_pcm_info __user *info;
88 unsigned int device, subdevice;
91 struct snd_pcm_str *pstr;
92 struct snd_pcm_substream *substream;
95 info = (struct snd_pcm_info __user *)arg;
96 if (get_user(device, &info->device))
98 if (get_user(stream, &info->stream))
100 if (stream < 0 || stream > 1)
102 if (get_user(subdevice, &info->subdevice))
104 mutex_lock(®ister_mutex);
105 pcm = snd_pcm_search(card, device);
110 pstr = &pcm->streams[stream];
111 if (pstr->substream_count == 0) {
115 if (subdevice >= pstr->substream_count) {
119 for (substream = pstr->substream; substream;
120 substream = substream->next)
121 if (substream->number == (int)subdevice)
123 if (substream == NULL) {
127 err = snd_pcm_info_user(substream, info);
129 mutex_unlock(®ister_mutex);
132 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
136 if (get_user(val, (int __user *)arg))
138 control->prefer_pcm_subdevice = val;
145 #ifdef CONFIG_SND_VERBOSE_PROCFS
147 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
148 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
149 #define READY(v) [SNDRV_PCM_READY_##v] = #v
150 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
151 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
152 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
153 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
154 #define START(v) [SNDRV_PCM_START_##v] = #v
155 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
156 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
158 static char *snd_pcm_format_names[] = {
177 FORMAT(IEC958_SUBFRAME_LE),
178 FORMAT(IEC958_SUBFRAME_BE),
199 static const char *snd_pcm_format_name(snd_pcm_format_t format)
201 return snd_pcm_format_names[format];
204 static char *snd_pcm_stream_names[] = {
209 static char *snd_pcm_state_names[] = {
220 static char *snd_pcm_access_names[] = {
221 ACCESS(MMAP_INTERLEAVED),
222 ACCESS(MMAP_NONINTERLEAVED),
223 ACCESS(MMAP_COMPLEX),
224 ACCESS(RW_INTERLEAVED),
225 ACCESS(RW_NONINTERLEAVED),
228 static char *snd_pcm_subformat_names[] = {
232 static char *snd_pcm_tstamp_mode_names[] = {
237 static const char *snd_pcm_stream_name(int stream)
239 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
240 return snd_pcm_stream_names[stream];
243 static const char *snd_pcm_access_name(snd_pcm_access_t access)
245 return snd_pcm_access_names[access];
248 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
250 return snd_pcm_subformat_names[subformat];
253 static const char *snd_pcm_tstamp_mode_name(int mode)
255 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
256 return snd_pcm_tstamp_mode_names[mode];
259 static const char *snd_pcm_state_name(snd_pcm_state_t state)
261 return snd_pcm_state_names[state];
264 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
265 #include <linux/soundcard.h>
267 static const char *snd_pcm_oss_format_name(int format)
296 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
297 struct snd_info_buffer *buffer)
299 struct snd_pcm_info *info;
305 info = kmalloc(sizeof(*info), GFP_KERNEL);
307 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
311 err = snd_pcm_info(substream, info);
313 snd_iprintf(buffer, "error %d\n", err);
317 snd_iprintf(buffer, "card: %d\n", info->card);
318 snd_iprintf(buffer, "device: %d\n", info->device);
319 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
320 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
321 snd_iprintf(buffer, "id: %s\n", info->id);
322 snd_iprintf(buffer, "name: %s\n", info->name);
323 snd_iprintf(buffer, "subname: %s\n", info->subname);
324 snd_iprintf(buffer, "class: %d\n", info->dev_class);
325 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
326 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
327 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
331 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
332 struct snd_info_buffer *buffer)
334 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
338 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
339 struct snd_info_buffer *buffer)
341 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
345 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
346 struct snd_info_buffer *buffer)
348 struct snd_pcm_substream *substream = entry->private_data;
349 struct snd_pcm_runtime *runtime = substream->runtime;
351 snd_iprintf(buffer, "closed\n");
354 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
355 snd_iprintf(buffer, "no setup\n");
358 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
359 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
360 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
361 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
362 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
363 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
364 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
365 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
366 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
367 if (substream->oss.oss) {
368 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
369 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
370 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
371 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
372 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
373 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
378 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
379 struct snd_info_buffer *buffer)
381 struct snd_pcm_substream *substream = entry->private_data;
382 struct snd_pcm_runtime *runtime = substream->runtime;
384 snd_iprintf(buffer, "closed\n");
387 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
388 snd_iprintf(buffer, "no setup\n");
391 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
392 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
393 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
394 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
395 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
396 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
397 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
398 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
399 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
400 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
403 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
404 struct snd_info_buffer *buffer)
406 struct snd_pcm_substream *substream = entry->private_data;
407 struct snd_pcm_runtime *runtime = substream->runtime;
408 struct snd_pcm_status status;
411 snd_iprintf(buffer, "closed\n");
414 memset(&status, 0, sizeof(status));
415 err = snd_pcm_status(substream, &status);
417 snd_iprintf(buffer, "error %d\n", err);
420 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
421 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
422 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
423 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
424 status.tstamp.tv_sec, status.tstamp.tv_nsec);
425 snd_iprintf(buffer, "delay : %ld\n", status.delay);
426 snd_iprintf(buffer, "avail : %ld\n", status.avail);
427 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
428 snd_iprintf(buffer, "-----\n");
429 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
430 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
433 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
434 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
435 struct snd_info_buffer *buffer)
437 struct snd_pcm_str *pstr = entry->private_data;
438 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
441 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
442 struct snd_info_buffer *buffer)
444 struct snd_pcm_str *pstr = entry->private_data;
446 if (!snd_info_get_line(buffer, line, sizeof(line)))
447 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
451 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
453 struct snd_pcm *pcm = pstr->pcm;
454 struct snd_info_entry *entry;
457 sprintf(name, "pcm%i%c", pcm->device,
458 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
459 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
461 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
462 if (snd_info_register(entry) < 0) {
463 snd_info_free_entry(entry);
466 pstr->proc_root = entry;
468 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
469 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
470 if (snd_info_register(entry) < 0) {
471 snd_info_free_entry(entry);
475 pstr->proc_info_entry = entry;
477 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
478 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
479 pstr->proc_root)) != NULL) {
480 entry->c.text.read = snd_pcm_xrun_debug_read;
481 entry->c.text.write = snd_pcm_xrun_debug_write;
482 entry->mode |= S_IWUSR;
483 entry->private_data = pstr;
484 if (snd_info_register(entry) < 0) {
485 snd_info_free_entry(entry);
489 pstr->proc_xrun_debug_entry = entry;
494 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
496 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
497 if (pstr->proc_xrun_debug_entry) {
498 snd_info_unregister(pstr->proc_xrun_debug_entry);
499 pstr->proc_xrun_debug_entry = NULL;
502 if (pstr->proc_info_entry) {
503 snd_info_unregister(pstr->proc_info_entry);
504 pstr->proc_info_entry = NULL;
506 if (pstr->proc_root) {
507 snd_info_unregister(pstr->proc_root);
508 pstr->proc_root = NULL;
513 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
515 struct snd_info_entry *entry;
516 struct snd_card *card;
519 card = substream->pcm->card;
521 sprintf(name, "sub%i", substream->number);
522 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
529 substream->proc_root = entry;
531 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, substream,
533 snd_pcm_substream_proc_info_read);
534 if (snd_info_register(entry) < 0) {
535 snd_info_free_entry(entry);
539 substream->proc_info_entry = entry;
541 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
542 snd_info_set_text_ops(entry, substream,
543 snd_pcm_substream_proc_hw_params_read);
544 if (snd_info_register(entry) < 0) {
545 snd_info_free_entry(entry);
549 substream->proc_hw_params_entry = entry;
551 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
552 snd_info_set_text_ops(entry, substream,
553 snd_pcm_substream_proc_sw_params_read);
554 if (snd_info_register(entry) < 0) {
555 snd_info_free_entry(entry);
559 substream->proc_sw_params_entry = entry;
561 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
562 snd_info_set_text_ops(entry, substream,
563 snd_pcm_substream_proc_status_read);
564 if (snd_info_register(entry) < 0) {
565 snd_info_free_entry(entry);
569 substream->proc_status_entry = entry;
574 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
576 if (substream->proc_info_entry) {
577 snd_info_unregister(substream->proc_info_entry);
578 substream->proc_info_entry = NULL;
580 if (substream->proc_hw_params_entry) {
581 snd_info_unregister(substream->proc_hw_params_entry);
582 substream->proc_hw_params_entry = NULL;
584 if (substream->proc_sw_params_entry) {
585 snd_info_unregister(substream->proc_sw_params_entry);
586 substream->proc_sw_params_entry = NULL;
588 if (substream->proc_status_entry) {
589 snd_info_unregister(substream->proc_status_entry);
590 substream->proc_status_entry = NULL;
592 if (substream->proc_root) {
593 snd_info_unregister(substream->proc_root);
594 substream->proc_root = NULL;
598 #else /* !CONFIG_SND_VERBOSE_PROCFS */
599 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
600 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
601 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
602 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
603 #endif /* CONFIG_SND_VERBOSE_PROCFS */
606 * snd_pcm_new_stream - create a new PCM stream
607 * @pcm: the pcm instance
608 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
609 * @substream_count: the number of substreams
611 * Creates a new stream for the pcm.
612 * The corresponding stream on the pcm must have been empty before
613 * calling this, i.e. zero must be given to the argument of
616 * Returns zero if successful, or a negative error code on failure.
618 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
621 struct snd_pcm_str *pstr = &pcm->streams[stream];
622 struct snd_pcm_substream *substream, *prev;
624 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
625 mutex_init(&pstr->oss.setup_mutex);
627 pstr->stream = stream;
629 pstr->substream_count = substream_count;
630 if (substream_count > 0) {
631 err = snd_pcm_stream_proc_init(pstr);
633 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
638 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
639 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
640 if (substream == NULL) {
641 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
644 substream->pcm = pcm;
645 substream->pstr = pstr;
646 substream->number = idx;
647 substream->stream = stream;
648 sprintf(substream->name, "subdevice #%i", idx);
649 substream->buffer_bytes_max = UINT_MAX;
651 pstr->substream = substream;
653 prev->next = substream;
654 err = snd_pcm_substream_proc_init(substream);
656 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
660 substream->group = &substream->self_group;
661 spin_lock_init(&substream->self_group.lock);
662 INIT_LIST_HEAD(&substream->self_group.substreams);
663 list_add_tail(&substream->link_list, &substream->self_group.substreams);
664 spin_lock_init(&substream->timer_lock);
670 EXPORT_SYMBOL(snd_pcm_new_stream);
673 * snd_pcm_new - create a new PCM instance
674 * @card: the card instance
676 * @device: the device index (zero based)
677 * @playback_count: the number of substreams for playback
678 * @capture_count: the number of substreams for capture
679 * @rpcm: the pointer to store the new pcm instance
681 * Creates a new PCM instance.
683 * The pcm operators have to be set afterwards to the new instance
684 * via snd_pcm_set_ops().
686 * Returns zero if successful, or a negative error code on failure.
688 int snd_pcm_new(struct snd_card *card, char *id, int device,
689 int playback_count, int capture_count,
690 struct snd_pcm ** rpcm)
694 static struct snd_device_ops ops = {
695 .dev_free = snd_pcm_dev_free,
696 .dev_register = snd_pcm_dev_register,
697 .dev_disconnect = snd_pcm_dev_disconnect,
698 .dev_unregister = snd_pcm_dev_unregister
701 snd_assert(rpcm != NULL, return -EINVAL);
703 snd_assert(card != NULL, return -ENXIO);
704 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
706 snd_printk(KERN_ERR "Cannot allocate PCM\n");
710 pcm->device = device;
712 strlcpy(pcm->id, id, sizeof(pcm->id));
713 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
717 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
721 mutex_init(&pcm->open_mutex);
722 init_waitqueue_head(&pcm->open_wait);
723 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
731 EXPORT_SYMBOL(snd_pcm_new);
733 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
735 struct snd_pcm_substream *substream, *substream_next;
736 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
737 struct snd_pcm_oss_setup *setup, *setupn;
739 substream = pstr->substream;
741 substream_next = substream->next;
742 snd_pcm_substream_proc_done(substream);
744 substream = substream_next;
746 snd_pcm_stream_proc_done(pstr);
747 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
748 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
749 setupn = setup->next;
750 kfree(setup->task_name);
756 static int snd_pcm_free(struct snd_pcm *pcm)
758 snd_assert(pcm != NULL, return -ENXIO);
759 if (pcm->private_free)
760 pcm->private_free(pcm);
761 snd_pcm_lib_preallocate_free_for_all(pcm);
762 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
763 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
768 static int snd_pcm_dev_free(struct snd_device *device)
770 struct snd_pcm *pcm = device->device_data;
771 return snd_pcm_free(pcm);
774 static void snd_pcm_tick_timer_func(unsigned long data)
776 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
777 snd_pcm_tick_elapsed(substream);
780 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
782 struct snd_pcm_substream **rsubstream)
784 struct snd_pcm_str * pstr;
785 struct snd_pcm_substream *substream;
786 struct snd_pcm_runtime *runtime;
787 struct snd_ctl_file *kctl;
788 struct snd_card *card;
789 struct list_head *list;
790 int prefer_subdevice = -1;
793 snd_assert(rsubstream != NULL, return -EINVAL);
795 snd_assert(pcm != NULL, return -ENXIO);
796 pstr = &pcm->streams[stream];
797 if (pstr->substream == NULL || pstr->substream_count == 0)
801 down_read(&card->controls_rwsem);
802 list_for_each(list, &card->ctl_files) {
803 kctl = snd_ctl_file(list);
804 if (kctl->pid == current->pid) {
805 prefer_subdevice = kctl->prefer_pcm_subdevice;
809 up_read(&card->controls_rwsem);
812 case SNDRV_PCM_STREAM_PLAYBACK:
813 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
814 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
815 if (SUBSTREAM_BUSY(substream))
820 case SNDRV_PCM_STREAM_CAPTURE:
821 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
822 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
823 if (SUBSTREAM_BUSY(substream))
832 if (prefer_subdevice >= 0) {
833 for (substream = pstr->substream; substream; substream = substream->next)
834 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
837 for (substream = pstr->substream; substream; substream = substream->next)
838 if (!SUBSTREAM_BUSY(substream))
841 if (substream == NULL)
844 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
848 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
849 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
850 if (runtime->status == NULL) {
854 memset((void*)runtime->status, 0, size);
856 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
857 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
858 if (runtime->control == NULL) {
859 snd_free_pages((void*)runtime->status,
860 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
864 memset((void*)runtime->control, 0, size);
866 init_waitqueue_head(&runtime->sleep);
867 atomic_set(&runtime->mmap_count, 0);
868 init_timer(&runtime->tick_timer);
869 runtime->tick_timer.function = snd_pcm_tick_timer_func;
870 runtime->tick_timer.data = (unsigned long) substream;
872 runtime->status->state = SNDRV_PCM_STATE_OPEN;
874 substream->runtime = runtime;
875 substream->private_data = pcm->private_data;
876 substream->ffile = file;
877 pstr->substream_opened++;
878 *rsubstream = substream;
882 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
884 struct snd_pcm_runtime *runtime;
885 substream->file = NULL;
886 runtime = substream->runtime;
887 snd_assert(runtime != NULL, return);
888 if (runtime->private_free != NULL)
889 runtime->private_free(runtime);
890 snd_free_pages((void*)runtime->status,
891 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
892 snd_free_pages((void*)runtime->control,
893 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
894 kfree(runtime->hw_constraints.rules);
896 substream->runtime = NULL;
897 substream->pstr->substream_opened--;
900 static int snd_pcm_dev_register(struct snd_device *device)
903 struct snd_pcm_substream *substream;
904 struct list_head *list;
906 struct snd_pcm *pcm = device->device_data;
908 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
909 mutex_lock(®ister_mutex);
910 if (snd_pcm_search(pcm->card, pcm->device)) {
911 mutex_unlock(®ister_mutex);
914 list_add_tail(&pcm->list, &snd_pcm_devices);
915 for (cidx = 0; cidx < 2; cidx++) {
917 if (pcm->streams[cidx].substream == NULL)
920 case SNDRV_PCM_STREAM_PLAYBACK:
921 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
922 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
924 case SNDRV_PCM_STREAM_CAPTURE:
925 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
926 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
929 if ((err = snd_register_device(devtype, pcm->card,
931 &snd_pcm_f_ops[cidx],
934 list_del(&pcm->list);
935 mutex_unlock(®ister_mutex);
938 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
939 snd_pcm_timer_init(substream);
941 list_for_each(list, &snd_pcm_notify_list) {
942 struct snd_pcm_notify *notify;
943 notify = list_entry(list, struct snd_pcm_notify, list);
944 notify->n_register(pcm);
946 mutex_unlock(®ister_mutex);
950 static int snd_pcm_dev_disconnect(struct snd_device *device)
952 struct snd_pcm *pcm = device->device_data;
953 struct list_head *list;
954 struct snd_pcm_substream *substream;
957 mutex_lock(®ister_mutex);
958 list_del_init(&pcm->list);
959 for (cidx = 0; cidx < 2; cidx++)
960 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
961 if (substream->runtime)
962 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
963 list_for_each(list, &snd_pcm_notify_list) {
964 struct snd_pcm_notify *notify;
965 notify = list_entry(list, struct snd_pcm_notify, list);
966 notify->n_disconnect(pcm);
968 mutex_unlock(®ister_mutex);
972 static int snd_pcm_dev_unregister(struct snd_device *device)
975 struct snd_pcm_substream *substream;
976 struct list_head *list;
977 struct snd_pcm *pcm = device->device_data;
979 snd_assert(pcm != NULL, return -ENXIO);
980 mutex_lock(®ister_mutex);
981 list_del(&pcm->list);
982 for (cidx = 0; cidx < 2; cidx++) {
985 case SNDRV_PCM_STREAM_PLAYBACK:
986 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
988 case SNDRV_PCM_STREAM_CAPTURE:
989 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
992 snd_unregister_device(devtype, pcm->card, pcm->device);
993 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
994 snd_pcm_timer_done(substream);
996 list_for_each(list, &snd_pcm_notify_list) {
997 struct snd_pcm_notify *notify;
998 notify = list_entry(list, struct snd_pcm_notify, list);
999 notify->n_unregister(pcm);
1001 mutex_unlock(®ister_mutex);
1002 return snd_pcm_free(pcm);
1005 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1007 struct list_head *p;
1009 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1010 mutex_lock(®ister_mutex);
1012 list_del(¬ify->list);
1013 list_for_each(p, &snd_pcm_devices)
1014 notify->n_unregister(list_entry(p,
1015 struct snd_pcm, list));
1017 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1018 list_for_each(p, &snd_pcm_devices)
1019 notify->n_register(list_entry(p, struct snd_pcm, list));
1021 mutex_unlock(®ister_mutex);
1025 EXPORT_SYMBOL(snd_pcm_notify);
1027 #ifdef CONFIG_PROC_FS
1032 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1033 struct snd_info_buffer *buffer)
1035 struct list_head *p;
1036 struct snd_pcm *pcm;
1038 mutex_lock(®ister_mutex);
1039 list_for_each(p, &snd_pcm_devices) {
1040 pcm = list_entry(p, struct snd_pcm, list);
1041 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1042 pcm->card->number, pcm->device, pcm->id, pcm->name);
1043 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1044 snd_iprintf(buffer, " : playback %i",
1045 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1046 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1047 snd_iprintf(buffer, " : capture %i",
1048 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1049 snd_iprintf(buffer, "\n");
1051 mutex_unlock(®ister_mutex);
1054 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1056 static void snd_pcm_proc_init(void)
1058 struct snd_info_entry *entry;
1060 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1061 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1062 if (snd_info_register(entry) < 0) {
1063 snd_info_free_entry(entry);
1067 snd_pcm_proc_entry = entry;
1070 static void snd_pcm_proc_done(void)
1072 if (snd_pcm_proc_entry)
1073 snd_info_unregister(snd_pcm_proc_entry);
1076 #else /* !CONFIG_PROC_FS */
1077 #define snd_pcm_proc_init()
1078 #define snd_pcm_proc_done()
1079 #endif /* CONFIG_PROC_FS */
1086 static int __init alsa_pcm_init(void)
1088 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1089 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1090 snd_pcm_proc_init();
1094 static void __exit alsa_pcm_exit(void)
1096 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1097 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1098 snd_pcm_proc_done();
1101 module_init(alsa_pcm_init)
1102 module_exit(alsa_pcm_exit)