2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/mutex.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/pcm.h>
29 #include <sound/control.h>
30 #include <sound/info.h>
32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
36 static LIST_HEAD(snd_pcm_devices);
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DEFINE_MUTEX(register_mutex);
40 static int snd_pcm_free(struct snd_pcm *pcm);
41 static int snd_pcm_dev_free(struct snd_device *device);
42 static int snd_pcm_dev_register(struct snd_device *device);
43 static int snd_pcm_dev_disconnect(struct snd_device *device);
45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
49 list_for_each_entry(pcm, &snd_pcm_devices, list) {
50 if (pcm->card == card && pcm->device == device)
56 static int snd_pcm_next(struct snd_card *card, int device)
60 list_for_each_entry(pcm, &snd_pcm_devices, list) {
61 if (pcm->card == card && pcm->device > device)
63 else if (pcm->card->number > card->number)
69 static int snd_pcm_add(struct snd_pcm *newpcm)
73 list_for_each_entry(pcm, &snd_pcm_devices, list) {
74 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
76 if (pcm->card->number > newpcm->card->number ||
77 (pcm->card == newpcm->card &&
78 pcm->device > newpcm->device)) {
79 list_add(&newpcm->list, pcm->list.prev);
83 list_add_tail(&newpcm->list, &snd_pcm_devices);
87 static int snd_pcm_control_ioctl(struct snd_card *card,
88 struct snd_ctl_file *control,
89 unsigned int cmd, unsigned long arg)
92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
96 if (get_user(device, (int __user *)arg))
98 mutex_lock(®ister_mutex);
99 device = snd_pcm_next(card, device);
100 mutex_unlock(®ister_mutex);
101 if (put_user(device, (int __user *)arg))
105 case SNDRV_CTL_IOCTL_PCM_INFO:
107 struct snd_pcm_info __user *info;
108 unsigned int device, subdevice;
111 struct snd_pcm_str *pstr;
112 struct snd_pcm_substream *substream;
115 info = (struct snd_pcm_info __user *)arg;
116 if (get_user(device, &info->device))
118 if (get_user(stream, &info->stream))
120 if (stream < 0 || stream > 1)
122 if (get_user(subdevice, &info->subdevice))
124 mutex_lock(®ister_mutex);
125 pcm = snd_pcm_get(card, device);
130 pstr = &pcm->streams[stream];
131 if (pstr->substream_count == 0) {
135 if (subdevice >= pstr->substream_count) {
139 for (substream = pstr->substream; substream;
140 substream = substream->next)
141 if (substream->number == (int)subdevice)
143 if (substream == NULL) {
147 err = snd_pcm_info_user(substream, info);
149 mutex_unlock(®ister_mutex);
152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
156 if (get_user(val, (int __user *)arg))
158 control->prefer_pcm_subdevice = val;
165 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
167 static char *snd_pcm_format_names[] = {
186 FORMAT(IEC958_SUBFRAME_LE),
187 FORMAT(IEC958_SUBFRAME_BE),
212 const char *snd_pcm_format_name(snd_pcm_format_t format)
214 if (format >= ARRAY_SIZE(snd_pcm_format_names))
216 return snd_pcm_format_names[format];
218 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
220 #ifdef CONFIG_SND_VERBOSE_PROCFS
222 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
223 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
224 #define READY(v) [SNDRV_PCM_READY_##v] = #v
225 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
226 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
227 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
228 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
229 #define START(v) [SNDRV_PCM_START_##v] = #v
230 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
232 static char *snd_pcm_stream_names[] = {
237 static char *snd_pcm_state_names[] = {
248 static char *snd_pcm_access_names[] = {
249 ACCESS(MMAP_INTERLEAVED),
250 ACCESS(MMAP_NONINTERLEAVED),
251 ACCESS(MMAP_COMPLEX),
252 ACCESS(RW_INTERLEAVED),
253 ACCESS(RW_NONINTERLEAVED),
256 static char *snd_pcm_subformat_names[] = {
260 static char *snd_pcm_tstamp_mode_names[] = {
265 static const char *snd_pcm_stream_name(int stream)
267 return snd_pcm_stream_names[stream];
270 static const char *snd_pcm_access_name(snd_pcm_access_t access)
272 return snd_pcm_access_names[access];
275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
277 return snd_pcm_subformat_names[subformat];
280 static const char *snd_pcm_tstamp_mode_name(int mode)
282 return snd_pcm_tstamp_mode_names[mode];
285 static const char *snd_pcm_state_name(snd_pcm_state_t state)
287 return snd_pcm_state_names[state];
290 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
291 #include <linux/soundcard.h>
293 static const char *snd_pcm_oss_format_name(int format)
322 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
323 struct snd_info_buffer *buffer)
325 struct snd_pcm_info *info;
331 info = kmalloc(sizeof(*info), GFP_KERNEL);
333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
337 err = snd_pcm_info(substream, info);
339 snd_iprintf(buffer, "error %d\n", err);
343 snd_iprintf(buffer, "card: %d\n", info->card);
344 snd_iprintf(buffer, "device: %d\n", info->device);
345 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
346 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
347 snd_iprintf(buffer, "id: %s\n", info->id);
348 snd_iprintf(buffer, "name: %s\n", info->name);
349 snd_iprintf(buffer, "subname: %s\n", info->subname);
350 snd_iprintf(buffer, "class: %d\n", info->dev_class);
351 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
352 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
353 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
357 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
358 struct snd_info_buffer *buffer)
360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
364 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
365 struct snd_info_buffer *buffer)
367 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
371 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
372 struct snd_info_buffer *buffer)
374 struct snd_pcm_substream *substream = entry->private_data;
375 struct snd_pcm_runtime *runtime = substream->runtime;
377 snd_iprintf(buffer, "closed\n");
380 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
381 snd_iprintf(buffer, "no setup\n");
384 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
385 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
386 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
387 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
388 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
389 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
390 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
391 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
392 if (substream->oss.oss) {
393 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
394 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
395 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
396 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
397 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
398 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
403 static void snd_pcm_substream_proc_sw_params_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;
409 snd_iprintf(buffer, "closed\n");
412 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
413 snd_iprintf(buffer, "no setup\n");
416 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
417 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
418 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
419 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
420 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
421 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
422 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
423 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
426 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
427 struct snd_info_buffer *buffer)
429 struct snd_pcm_substream *substream = entry->private_data;
430 struct snd_pcm_runtime *runtime = substream->runtime;
431 struct snd_pcm_status status;
434 snd_iprintf(buffer, "closed\n");
437 memset(&status, 0, sizeof(status));
438 err = snd_pcm_status(substream, &status);
440 snd_iprintf(buffer, "error %d\n", err);
443 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
444 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
445 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
446 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
447 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
448 status.tstamp.tv_sec, status.tstamp.tv_nsec);
449 snd_iprintf(buffer, "delay : %ld\n", status.delay);
450 snd_iprintf(buffer, "avail : %ld\n", status.avail);
451 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
452 snd_iprintf(buffer, "-----\n");
453 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
454 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
457 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
458 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
459 struct snd_info_buffer *buffer)
461 struct snd_pcm_str *pstr = entry->private_data;
462 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
465 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
466 struct snd_info_buffer *buffer)
468 struct snd_pcm_str *pstr = entry->private_data;
470 if (!snd_info_get_line(buffer, line, sizeof(line)))
471 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
475 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
477 struct snd_pcm *pcm = pstr->pcm;
478 struct snd_info_entry *entry;
481 sprintf(name, "pcm%i%c", pcm->device,
482 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
483 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
485 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
486 if (snd_info_register(entry) < 0) {
487 snd_info_free_entry(entry);
490 pstr->proc_root = entry;
492 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
493 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
494 if (snd_info_register(entry) < 0) {
495 snd_info_free_entry(entry);
499 pstr->proc_info_entry = entry;
501 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
502 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
503 pstr->proc_root)) != NULL) {
504 entry->c.text.read = snd_pcm_xrun_debug_read;
505 entry->c.text.write = snd_pcm_xrun_debug_write;
506 entry->mode |= S_IWUSR;
507 entry->private_data = pstr;
508 if (snd_info_register(entry) < 0) {
509 snd_info_free_entry(entry);
513 pstr->proc_xrun_debug_entry = entry;
518 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
520 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
521 snd_info_free_entry(pstr->proc_xrun_debug_entry);
522 pstr->proc_xrun_debug_entry = NULL;
524 snd_info_free_entry(pstr->proc_info_entry);
525 pstr->proc_info_entry = NULL;
526 snd_info_free_entry(pstr->proc_root);
527 pstr->proc_root = NULL;
531 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
533 struct snd_info_entry *entry;
534 struct snd_card *card;
537 card = substream->pcm->card;
539 sprintf(name, "sub%i", substream->number);
540 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
542 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
543 if (snd_info_register(entry) < 0) {
544 snd_info_free_entry(entry);
547 substream->proc_root = entry;
549 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
550 snd_info_set_text_ops(entry, substream,
551 snd_pcm_substream_proc_info_read);
552 if (snd_info_register(entry) < 0) {
553 snd_info_free_entry(entry);
557 substream->proc_info_entry = entry;
559 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
560 snd_info_set_text_ops(entry, substream,
561 snd_pcm_substream_proc_hw_params_read);
562 if (snd_info_register(entry) < 0) {
563 snd_info_free_entry(entry);
567 substream->proc_hw_params_entry = entry;
569 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
570 snd_info_set_text_ops(entry, substream,
571 snd_pcm_substream_proc_sw_params_read);
572 if (snd_info_register(entry) < 0) {
573 snd_info_free_entry(entry);
577 substream->proc_sw_params_entry = entry;
579 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
580 snd_info_set_text_ops(entry, substream,
581 snd_pcm_substream_proc_status_read);
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
587 substream->proc_status_entry = entry;
592 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
594 snd_info_free_entry(substream->proc_info_entry);
595 substream->proc_info_entry = NULL;
596 snd_info_free_entry(substream->proc_hw_params_entry);
597 substream->proc_hw_params_entry = NULL;
598 snd_info_free_entry(substream->proc_sw_params_entry);
599 substream->proc_sw_params_entry = NULL;
600 snd_info_free_entry(substream->proc_status_entry);
601 substream->proc_status_entry = NULL;
602 snd_info_free_entry(substream->proc_root);
603 substream->proc_root = NULL;
606 #else /* !CONFIG_SND_VERBOSE_PROCFS */
607 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
608 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
609 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
610 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
611 #endif /* CONFIG_SND_VERBOSE_PROCFS */
614 * snd_pcm_new_stream - create a new PCM stream
615 * @pcm: the pcm instance
616 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
617 * @substream_count: the number of substreams
619 * Creates a new stream for the pcm.
620 * The corresponding stream on the pcm must have been empty before
621 * calling this, i.e. zero must be given to the argument of
624 * Returns zero if successful, or a negative error code on failure.
626 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
629 struct snd_pcm_str *pstr = &pcm->streams[stream];
630 struct snd_pcm_substream *substream, *prev;
632 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
633 mutex_init(&pstr->oss.setup_mutex);
635 pstr->stream = stream;
637 pstr->substream_count = substream_count;
638 if (substream_count > 0) {
639 err = snd_pcm_stream_proc_init(pstr);
641 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
646 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
647 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
648 if (substream == NULL) {
649 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
652 substream->pcm = pcm;
653 substream->pstr = pstr;
654 substream->number = idx;
655 substream->stream = stream;
656 sprintf(substream->name, "subdevice #%i", idx);
657 substream->buffer_bytes_max = UINT_MAX;
659 pstr->substream = substream;
661 prev->next = substream;
662 err = snd_pcm_substream_proc_init(substream);
664 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
666 pstr->substream = NULL;
672 substream->group = &substream->self_group;
673 spin_lock_init(&substream->self_group.lock);
674 INIT_LIST_HEAD(&substream->self_group.substreams);
675 list_add_tail(&substream->link_list, &substream->self_group.substreams);
676 atomic_set(&substream->mmap_count, 0);
682 EXPORT_SYMBOL(snd_pcm_new_stream);
685 * snd_pcm_new - create a new PCM instance
686 * @card: the card instance
688 * @device: the device index (zero based)
689 * @playback_count: the number of substreams for playback
690 * @capture_count: the number of substreams for capture
691 * @rpcm: the pointer to store the new pcm instance
693 * Creates a new PCM instance.
695 * The pcm operators have to be set afterwards to the new instance
696 * via snd_pcm_set_ops().
698 * Returns zero if successful, or a negative error code on failure.
700 int snd_pcm_new(struct snd_card *card, const char *id, int device,
701 int playback_count, int capture_count,
702 struct snd_pcm ** rpcm)
706 static struct snd_device_ops ops = {
707 .dev_free = snd_pcm_dev_free,
708 .dev_register = snd_pcm_dev_register,
709 .dev_disconnect = snd_pcm_dev_disconnect,
712 if (snd_BUG_ON(!card))
716 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
718 snd_printk(KERN_ERR "Cannot allocate PCM\n");
722 pcm->device = device;
724 strlcpy(pcm->id, id, sizeof(pcm->id));
725 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
729 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
733 mutex_init(&pcm->open_mutex);
734 init_waitqueue_head(&pcm->open_wait);
735 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
744 EXPORT_SYMBOL(snd_pcm_new);
746 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
748 struct snd_pcm_substream *substream, *substream_next;
749 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
750 struct snd_pcm_oss_setup *setup, *setupn;
752 substream = pstr->substream;
754 substream_next = substream->next;
755 snd_pcm_timer_done(substream);
756 snd_pcm_substream_proc_done(substream);
758 substream = substream_next;
760 snd_pcm_stream_proc_done(pstr);
761 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
762 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
763 setupn = setup->next;
764 kfree(setup->task_name);
770 static int snd_pcm_free(struct snd_pcm *pcm)
772 struct snd_pcm_notify *notify;
776 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
777 notify->n_unregister(pcm);
779 if (pcm->private_free)
780 pcm->private_free(pcm);
781 snd_pcm_lib_preallocate_free_for_all(pcm);
782 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
783 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
788 static int snd_pcm_dev_free(struct snd_device *device)
790 struct snd_pcm *pcm = device->device_data;
791 return snd_pcm_free(pcm);
794 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
796 struct snd_pcm_substream **rsubstream)
798 struct snd_pcm_str * pstr;
799 struct snd_pcm_substream *substream;
800 struct snd_pcm_runtime *runtime;
801 struct snd_ctl_file *kctl;
802 struct snd_card *card;
803 int prefer_subdevice = -1;
806 if (snd_BUG_ON(!pcm || !rsubstream))
809 pstr = &pcm->streams[stream];
810 if (pstr->substream == NULL || pstr->substream_count == 0)
814 read_lock(&card->ctl_files_rwlock);
815 list_for_each_entry(kctl, &card->ctl_files, list) {
816 if (kctl->pid == task_pid(current)) {
817 prefer_subdevice = kctl->prefer_pcm_subdevice;
818 if (prefer_subdevice != -1)
822 read_unlock(&card->ctl_files_rwlock);
825 case SNDRV_PCM_STREAM_PLAYBACK:
826 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
827 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
828 if (SUBSTREAM_BUSY(substream))
833 case SNDRV_PCM_STREAM_CAPTURE:
834 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
835 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
836 if (SUBSTREAM_BUSY(substream))
845 if (file->f_flags & O_APPEND) {
846 if (prefer_subdevice < 0) {
847 if (pstr->substream_count > 1)
848 return -EINVAL; /* must be unique */
849 substream = pstr->substream;
851 for (substream = pstr->substream; substream;
852 substream = substream->next)
853 if (substream->number == prefer_subdevice)
858 if (! SUBSTREAM_BUSY(substream))
860 substream->ref_count++;
861 *rsubstream = substream;
865 if (prefer_subdevice >= 0) {
866 for (substream = pstr->substream; substream; substream = substream->next)
867 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
870 for (substream = pstr->substream; substream; substream = substream->next)
871 if (!SUBSTREAM_BUSY(substream))
874 if (substream == NULL)
877 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
881 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
882 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
883 if (runtime->status == NULL) {
887 memset((void*)runtime->status, 0, size);
889 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
890 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
891 if (runtime->control == NULL) {
892 snd_free_pages((void*)runtime->status,
893 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
897 memset((void*)runtime->control, 0, size);
899 init_waitqueue_head(&runtime->sleep);
900 init_waitqueue_head(&runtime->tsleep);
902 runtime->status->state = SNDRV_PCM_STATE_OPEN;
904 substream->runtime = runtime;
905 substream->private_data = pcm->private_data;
906 substream->ref_count = 1;
907 substream->f_flags = file->f_flags;
908 substream->pid = get_pid(task_pid(current));
909 pstr->substream_opened++;
910 *rsubstream = substream;
914 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
916 struct snd_pcm_runtime *runtime;
918 if (PCM_RUNTIME_CHECK(substream))
920 runtime = substream->runtime;
921 if (runtime->private_free != NULL)
922 runtime->private_free(runtime);
923 snd_free_pages((void*)runtime->status,
924 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
925 snd_free_pages((void*)runtime->control,
926 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
927 kfree(runtime->hw_constraints.rules);
928 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
929 if (runtime->hwptr_log)
930 kfree(runtime->hwptr_log);
933 substream->runtime = NULL;
934 put_pid(substream->pid);
935 substream->pid = NULL;
936 substream->pstr->substream_opened--;
939 static ssize_t show_pcm_class(struct device *dev,
940 struct device_attribute *attr, char *buf)
944 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
945 [SNDRV_PCM_CLASS_GENERIC] = "generic",
946 [SNDRV_PCM_CLASS_MULTI] = "multi",
947 [SNDRV_PCM_CLASS_MODEM] = "modem",
948 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
951 if (! (pcm = dev_get_drvdata(dev)) ||
952 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
955 str = strs[pcm->dev_class];
956 return snprintf(buf, PAGE_SIZE, "%s\n", str);
959 static struct device_attribute pcm_attrs =
960 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
962 static int snd_pcm_dev_register(struct snd_device *device)
965 struct snd_pcm_substream *substream;
966 struct snd_pcm_notify *notify;
971 if (snd_BUG_ON(!device || !device->device_data))
973 pcm = device->device_data;
974 mutex_lock(®ister_mutex);
975 err = snd_pcm_add(pcm);
977 mutex_unlock(®ister_mutex);
980 for (cidx = 0; cidx < 2; cidx++) {
982 if (pcm->streams[cidx].substream == NULL)
985 case SNDRV_PCM_STREAM_PLAYBACK:
986 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
987 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
989 case SNDRV_PCM_STREAM_CAPTURE:
990 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
991 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
994 /* device pointer to use, pcm->dev takes precedence if
995 * it is assigned, otherwise fall back to card's device
999 dev = snd_card_get_device_link(pcm->card);
1001 err = snd_register_device_for_dev(devtype, pcm->card,
1003 &snd_pcm_f_ops[cidx],
1006 list_del(&pcm->list);
1007 mutex_unlock(®ister_mutex);
1010 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1012 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1013 snd_pcm_timer_init(substream);
1016 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1017 notify->n_register(pcm);
1019 mutex_unlock(®ister_mutex);
1023 static int snd_pcm_dev_disconnect(struct snd_device *device)
1025 struct snd_pcm *pcm = device->device_data;
1026 struct snd_pcm_notify *notify;
1027 struct snd_pcm_substream *substream;
1030 mutex_lock(®ister_mutex);
1031 if (list_empty(&pcm->list))
1034 list_del_init(&pcm->list);
1035 for (cidx = 0; cidx < 2; cidx++)
1036 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1037 if (substream->runtime)
1038 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1039 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1040 notify->n_disconnect(pcm);
1042 for (cidx = 0; cidx < 2; cidx++) {
1045 case SNDRV_PCM_STREAM_PLAYBACK:
1046 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1048 case SNDRV_PCM_STREAM_CAPTURE:
1049 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1052 snd_unregister_device(devtype, pcm->card, pcm->device);
1055 mutex_unlock(®ister_mutex);
1059 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1061 struct snd_pcm *pcm;
1063 if (snd_BUG_ON(!notify ||
1064 !notify->n_register ||
1065 !notify->n_unregister ||
1066 !notify->n_disconnect))
1068 mutex_lock(®ister_mutex);
1070 list_del(¬ify->list);
1071 list_for_each_entry(pcm, &snd_pcm_devices, list)
1072 notify->n_unregister(pcm);
1074 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1075 list_for_each_entry(pcm, &snd_pcm_devices, list)
1076 notify->n_register(pcm);
1078 mutex_unlock(®ister_mutex);
1082 EXPORT_SYMBOL(snd_pcm_notify);
1084 #ifdef CONFIG_PROC_FS
1089 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1090 struct snd_info_buffer *buffer)
1092 struct snd_pcm *pcm;
1094 mutex_lock(®ister_mutex);
1095 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1096 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1097 pcm->card->number, pcm->device, pcm->id, pcm->name);
1098 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1099 snd_iprintf(buffer, " : playback %i",
1100 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1101 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1102 snd_iprintf(buffer, " : capture %i",
1103 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1104 snd_iprintf(buffer, "\n");
1106 mutex_unlock(®ister_mutex);
1109 static struct snd_info_entry *snd_pcm_proc_entry;
1111 static void snd_pcm_proc_init(void)
1113 struct snd_info_entry *entry;
1115 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1116 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1117 if (snd_info_register(entry) < 0) {
1118 snd_info_free_entry(entry);
1122 snd_pcm_proc_entry = entry;
1125 static void snd_pcm_proc_done(void)
1127 snd_info_free_entry(snd_pcm_proc_entry);
1130 #else /* !CONFIG_PROC_FS */
1131 #define snd_pcm_proc_init()
1132 #define snd_pcm_proc_done()
1133 #endif /* CONFIG_PROC_FS */
1140 static int __init alsa_pcm_init(void)
1142 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1143 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1144 snd_pcm_proc_init();
1148 static void __exit alsa_pcm_exit(void)
1150 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1151 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1152 snd_pcm_proc_done();
1155 module_init(alsa_pcm_init)
1156 module_exit(alsa_pcm_exit)