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),
208 const char *snd_pcm_format_name(snd_pcm_format_t format)
210 return snd_pcm_format_names[format];
212 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
214 #ifdef CONFIG_SND_VERBOSE_PROCFS
216 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
217 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
218 #define READY(v) [SNDRV_PCM_READY_##v] = #v
219 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
220 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
221 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
222 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
223 #define START(v) [SNDRV_PCM_START_##v] = #v
224 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
226 static char *snd_pcm_stream_names[] = {
231 static char *snd_pcm_state_names[] = {
242 static char *snd_pcm_access_names[] = {
243 ACCESS(MMAP_INTERLEAVED),
244 ACCESS(MMAP_NONINTERLEAVED),
245 ACCESS(MMAP_COMPLEX),
246 ACCESS(RW_INTERLEAVED),
247 ACCESS(RW_NONINTERLEAVED),
250 static char *snd_pcm_subformat_names[] = {
254 static char *snd_pcm_tstamp_mode_names[] = {
259 static const char *snd_pcm_stream_name(int stream)
261 return snd_pcm_stream_names[stream];
264 static const char *snd_pcm_access_name(snd_pcm_access_t access)
266 return snd_pcm_access_names[access];
269 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
271 return snd_pcm_subformat_names[subformat];
274 static const char *snd_pcm_tstamp_mode_name(int mode)
276 return snd_pcm_tstamp_mode_names[mode];
279 static const char *snd_pcm_state_name(snd_pcm_state_t state)
281 return snd_pcm_state_names[state];
284 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
285 #include <linux/soundcard.h>
287 static const char *snd_pcm_oss_format_name(int format)
316 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
317 struct snd_info_buffer *buffer)
319 struct snd_pcm_info *info;
325 info = kmalloc(sizeof(*info), GFP_KERNEL);
327 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
331 err = snd_pcm_info(substream, info);
333 snd_iprintf(buffer, "error %d\n", err);
337 snd_iprintf(buffer, "card: %d\n", info->card);
338 snd_iprintf(buffer, "device: %d\n", info->device);
339 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
340 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
341 snd_iprintf(buffer, "id: %s\n", info->id);
342 snd_iprintf(buffer, "name: %s\n", info->name);
343 snd_iprintf(buffer, "subname: %s\n", info->subname);
344 snd_iprintf(buffer, "class: %d\n", info->dev_class);
345 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
346 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
347 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
351 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
352 struct snd_info_buffer *buffer)
354 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
358 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
359 struct snd_info_buffer *buffer)
361 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
365 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
368 struct snd_pcm_substream *substream = entry->private_data;
369 struct snd_pcm_runtime *runtime = substream->runtime;
371 snd_iprintf(buffer, "closed\n");
374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
375 snd_iprintf(buffer, "no setup\n");
378 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
379 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
380 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
381 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
382 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
383 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
384 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
385 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
386 if (substream->oss.oss) {
387 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
388 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
389 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
390 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
391 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
392 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
397 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
398 struct snd_info_buffer *buffer)
400 struct snd_pcm_substream *substream = entry->private_data;
401 struct snd_pcm_runtime *runtime = substream->runtime;
403 snd_iprintf(buffer, "closed\n");
406 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
407 snd_iprintf(buffer, "no setup\n");
410 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
411 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
412 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
413 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
414 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
415 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
416 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
417 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
420 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
421 struct snd_info_buffer *buffer)
423 struct snd_pcm_substream *substream = entry->private_data;
424 struct snd_pcm_runtime *runtime = substream->runtime;
425 struct snd_pcm_status status;
428 snd_iprintf(buffer, "closed\n");
431 memset(&status, 0, sizeof(status));
432 err = snd_pcm_status(substream, &status);
434 snd_iprintf(buffer, "error %d\n", err);
437 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
438 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
439 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
440 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
441 status.tstamp.tv_sec, status.tstamp.tv_nsec);
442 snd_iprintf(buffer, "delay : %ld\n", status.delay);
443 snd_iprintf(buffer, "avail : %ld\n", status.avail);
444 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
445 snd_iprintf(buffer, "-----\n");
446 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
447 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
450 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
451 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
452 struct snd_info_buffer *buffer)
454 struct snd_pcm_str *pstr = entry->private_data;
455 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
458 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
459 struct snd_info_buffer *buffer)
461 struct snd_pcm_str *pstr = entry->private_data;
463 if (!snd_info_get_line(buffer, line, sizeof(line)))
464 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
468 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
470 struct snd_pcm *pcm = pstr->pcm;
471 struct snd_info_entry *entry;
474 sprintf(name, "pcm%i%c", pcm->device,
475 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
476 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
478 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
479 if (snd_info_register(entry) < 0) {
480 snd_info_free_entry(entry);
483 pstr->proc_root = entry;
485 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
486 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
487 if (snd_info_register(entry) < 0) {
488 snd_info_free_entry(entry);
492 pstr->proc_info_entry = entry;
494 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
495 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
496 pstr->proc_root)) != NULL) {
497 entry->c.text.read = snd_pcm_xrun_debug_read;
498 entry->c.text.write = snd_pcm_xrun_debug_write;
499 entry->mode |= S_IWUSR;
500 entry->private_data = pstr;
501 if (snd_info_register(entry) < 0) {
502 snd_info_free_entry(entry);
506 pstr->proc_xrun_debug_entry = entry;
511 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
513 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
514 snd_info_free_entry(pstr->proc_xrun_debug_entry);
515 pstr->proc_xrun_debug_entry = NULL;
517 snd_info_free_entry(pstr->proc_info_entry);
518 pstr->proc_info_entry = NULL;
519 snd_info_free_entry(pstr->proc_root);
520 pstr->proc_root = NULL;
524 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
526 struct snd_info_entry *entry;
527 struct snd_card *card;
530 card = substream->pcm->card;
532 sprintf(name, "sub%i", substream->number);
533 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
535 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
536 if (snd_info_register(entry) < 0) {
537 snd_info_free_entry(entry);
540 substream->proc_root = entry;
542 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
543 snd_info_set_text_ops(entry, substream,
544 snd_pcm_substream_proc_info_read);
545 if (snd_info_register(entry) < 0) {
546 snd_info_free_entry(entry);
550 substream->proc_info_entry = entry;
552 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
553 snd_info_set_text_ops(entry, substream,
554 snd_pcm_substream_proc_hw_params_read);
555 if (snd_info_register(entry) < 0) {
556 snd_info_free_entry(entry);
560 substream->proc_hw_params_entry = entry;
562 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
563 snd_info_set_text_ops(entry, substream,
564 snd_pcm_substream_proc_sw_params_read);
565 if (snd_info_register(entry) < 0) {
566 snd_info_free_entry(entry);
570 substream->proc_sw_params_entry = entry;
572 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
573 snd_info_set_text_ops(entry, substream,
574 snd_pcm_substream_proc_status_read);
575 if (snd_info_register(entry) < 0) {
576 snd_info_free_entry(entry);
580 substream->proc_status_entry = entry;
585 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
587 snd_info_free_entry(substream->proc_info_entry);
588 substream->proc_info_entry = NULL;
589 snd_info_free_entry(substream->proc_hw_params_entry);
590 substream->proc_hw_params_entry = NULL;
591 snd_info_free_entry(substream->proc_sw_params_entry);
592 substream->proc_sw_params_entry = NULL;
593 snd_info_free_entry(substream->proc_status_entry);
594 substream->proc_status_entry = NULL;
595 snd_info_free_entry(substream->proc_root);
596 substream->proc_root = NULL;
599 #else /* !CONFIG_SND_VERBOSE_PROCFS */
600 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
601 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
602 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
603 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
604 #endif /* CONFIG_SND_VERBOSE_PROCFS */
607 * snd_pcm_new_stream - create a new PCM stream
608 * @pcm: the pcm instance
609 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
610 * @substream_count: the number of substreams
612 * Creates a new stream for the pcm.
613 * The corresponding stream on the pcm must have been empty before
614 * calling this, i.e. zero must be given to the argument of
617 * Returns zero if successful, or a negative error code on failure.
619 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
622 struct snd_pcm_str *pstr = &pcm->streams[stream];
623 struct snd_pcm_substream *substream, *prev;
625 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
626 mutex_init(&pstr->oss.setup_mutex);
628 pstr->stream = stream;
630 pstr->substream_count = substream_count;
631 if (substream_count > 0) {
632 err = snd_pcm_stream_proc_init(pstr);
634 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
639 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
640 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
641 if (substream == NULL) {
642 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
645 substream->pcm = pcm;
646 substream->pstr = pstr;
647 substream->number = idx;
648 substream->stream = stream;
649 sprintf(substream->name, "subdevice #%i", idx);
650 snprintf(substream->latency_id, sizeof(substream->latency_id),
651 "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
652 (stream ? 'c' : 'p'), idx);
653 substream->buffer_bytes_max = UINT_MAX;
655 pstr->substream = substream;
657 prev->next = substream;
658 err = snd_pcm_substream_proc_init(substream);
660 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
662 pstr->substream = NULL;
668 substream->group = &substream->self_group;
669 spin_lock_init(&substream->self_group.lock);
670 INIT_LIST_HEAD(&substream->self_group.substreams);
671 list_add_tail(&substream->link_list, &substream->self_group.substreams);
672 atomic_set(&substream->mmap_count, 0);
678 EXPORT_SYMBOL(snd_pcm_new_stream);
681 * snd_pcm_new - create a new PCM instance
682 * @card: the card instance
684 * @device: the device index (zero based)
685 * @playback_count: the number of substreams for playback
686 * @capture_count: the number of substreams for capture
687 * @rpcm: the pointer to store the new pcm instance
689 * Creates a new PCM instance.
691 * The pcm operators have to be set afterwards to the new instance
692 * via snd_pcm_set_ops().
694 * Returns zero if successful, or a negative error code on failure.
696 int snd_pcm_new(struct snd_card *card, const char *id, int device,
697 int playback_count, int capture_count,
698 struct snd_pcm ** rpcm)
702 static struct snd_device_ops ops = {
703 .dev_free = snd_pcm_dev_free,
704 .dev_register = snd_pcm_dev_register,
705 .dev_disconnect = snd_pcm_dev_disconnect,
708 if (snd_BUG_ON(!card))
712 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
714 snd_printk(KERN_ERR "Cannot allocate PCM\n");
718 pcm->device = device;
720 strlcpy(pcm->id, id, sizeof(pcm->id));
721 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
725 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
729 mutex_init(&pcm->open_mutex);
730 init_waitqueue_head(&pcm->open_wait);
731 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
740 EXPORT_SYMBOL(snd_pcm_new);
742 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
744 struct snd_pcm_substream *substream, *substream_next;
745 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
746 struct snd_pcm_oss_setup *setup, *setupn;
748 substream = pstr->substream;
750 substream_next = substream->next;
751 snd_pcm_timer_done(substream);
752 snd_pcm_substream_proc_done(substream);
754 substream = substream_next;
756 snd_pcm_stream_proc_done(pstr);
757 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
758 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
759 setupn = setup->next;
760 kfree(setup->task_name);
766 static int snd_pcm_free(struct snd_pcm *pcm)
768 struct snd_pcm_notify *notify;
772 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
773 notify->n_unregister(pcm);
775 if (pcm->private_free)
776 pcm->private_free(pcm);
777 snd_pcm_lib_preallocate_free_for_all(pcm);
778 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
779 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
784 static int snd_pcm_dev_free(struct snd_device *device)
786 struct snd_pcm *pcm = device->device_data;
787 return snd_pcm_free(pcm);
790 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
792 struct snd_pcm_substream **rsubstream)
794 struct snd_pcm_str * pstr;
795 struct snd_pcm_substream *substream;
796 struct snd_pcm_runtime *runtime;
797 struct snd_ctl_file *kctl;
798 struct snd_card *card;
799 int prefer_subdevice = -1;
802 if (snd_BUG_ON(!pcm || !rsubstream))
805 pstr = &pcm->streams[stream];
806 if (pstr->substream == NULL || pstr->substream_count == 0)
810 read_lock(&card->ctl_files_rwlock);
811 list_for_each_entry(kctl, &card->ctl_files, list) {
812 if (kctl->pid == current->pid) {
813 prefer_subdevice = kctl->prefer_pcm_subdevice;
814 if (prefer_subdevice != -1)
818 read_unlock(&card->ctl_files_rwlock);
821 case SNDRV_PCM_STREAM_PLAYBACK:
822 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
823 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
824 if (SUBSTREAM_BUSY(substream))
829 case SNDRV_PCM_STREAM_CAPTURE:
830 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
831 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
832 if (SUBSTREAM_BUSY(substream))
841 if (file->f_flags & O_APPEND) {
842 if (prefer_subdevice < 0) {
843 if (pstr->substream_count > 1)
844 return -EINVAL; /* must be unique */
845 substream = pstr->substream;
847 for (substream = pstr->substream; substream;
848 substream = substream->next)
849 if (substream->number == prefer_subdevice)
854 if (! SUBSTREAM_BUSY(substream))
856 substream->ref_count++;
857 *rsubstream = substream;
861 if (prefer_subdevice >= 0) {
862 for (substream = pstr->substream; substream; substream = substream->next)
863 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
866 for (substream = pstr->substream; substream; substream = substream->next)
867 if (!SUBSTREAM_BUSY(substream))
870 if (substream == NULL)
873 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
877 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
878 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
879 if (runtime->status == NULL) {
883 memset((void*)runtime->status, 0, size);
885 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
886 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
887 if (runtime->control == NULL) {
888 snd_free_pages((void*)runtime->status,
889 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
893 memset((void*)runtime->control, 0, size);
895 init_waitqueue_head(&runtime->sleep);
897 runtime->status->state = SNDRV_PCM_STATE_OPEN;
899 substream->runtime = runtime;
900 substream->private_data = pcm->private_data;
901 substream->ref_count = 1;
902 substream->f_flags = file->f_flags;
903 pstr->substream_opened++;
904 *rsubstream = substream;
908 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
910 struct snd_pcm_runtime *runtime;
912 if (PCM_RUNTIME_CHECK(substream))
914 runtime = substream->runtime;
915 if (runtime->private_free != NULL)
916 runtime->private_free(runtime);
917 snd_free_pages((void*)runtime->status,
918 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
919 snd_free_pages((void*)runtime->control,
920 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
921 kfree(runtime->hw_constraints.rules);
923 substream->runtime = NULL;
924 substream->pstr->substream_opened--;
927 static ssize_t show_pcm_class(struct device *dev,
928 struct device_attribute *attr, char *buf)
932 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
933 [SNDRV_PCM_CLASS_GENERIC] = "generic",
934 [SNDRV_PCM_CLASS_MULTI] = "multi",
935 [SNDRV_PCM_CLASS_MODEM] = "modem",
936 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
939 if (! (pcm = dev_get_drvdata(dev)) ||
940 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
943 str = strs[pcm->dev_class];
944 return snprintf(buf, PAGE_SIZE, "%s\n", str);
947 static struct device_attribute pcm_attrs =
948 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
950 static int snd_pcm_dev_register(struct snd_device *device)
953 struct snd_pcm_substream *substream;
954 struct snd_pcm_notify *notify;
959 if (snd_BUG_ON(!device || !device->device_data))
961 pcm = device->device_data;
962 mutex_lock(®ister_mutex);
963 err = snd_pcm_add(pcm);
965 mutex_unlock(®ister_mutex);
968 for (cidx = 0; cidx < 2; cidx++) {
970 if (pcm->streams[cidx].substream == NULL)
973 case SNDRV_PCM_STREAM_PLAYBACK:
974 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
975 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
977 case SNDRV_PCM_STREAM_CAPTURE:
978 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
979 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
982 /* device pointer to use, pcm->dev takes precedence if
983 * it is assigned, otherwise fall back to card's device
987 dev = snd_card_get_device_link(pcm->card);
989 err = snd_register_device_for_dev(devtype, pcm->card,
991 &snd_pcm_f_ops[cidx],
994 list_del(&pcm->list);
995 mutex_unlock(®ister_mutex);
998 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1000 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1001 snd_pcm_timer_init(substream);
1004 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1005 notify->n_register(pcm);
1007 mutex_unlock(®ister_mutex);
1011 static int snd_pcm_dev_disconnect(struct snd_device *device)
1013 struct snd_pcm *pcm = device->device_data;
1014 struct snd_pcm_notify *notify;
1015 struct snd_pcm_substream *substream;
1018 mutex_lock(®ister_mutex);
1019 if (list_empty(&pcm->list))
1022 list_del_init(&pcm->list);
1023 for (cidx = 0; cidx < 2; cidx++)
1024 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1025 if (substream->runtime)
1026 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1027 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1028 notify->n_disconnect(pcm);
1030 for (cidx = 0; cidx < 2; cidx++) {
1033 case SNDRV_PCM_STREAM_PLAYBACK:
1034 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1036 case SNDRV_PCM_STREAM_CAPTURE:
1037 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1040 snd_unregister_device(devtype, pcm->card, pcm->device);
1043 mutex_unlock(®ister_mutex);
1047 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1049 struct snd_pcm *pcm;
1051 if (snd_BUG_ON(!notify ||
1052 !notify->n_register ||
1053 !notify->n_unregister ||
1054 !notify->n_disconnect))
1056 mutex_lock(®ister_mutex);
1058 list_del(¬ify->list);
1059 list_for_each_entry(pcm, &snd_pcm_devices, list)
1060 notify->n_unregister(pcm);
1062 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1063 list_for_each_entry(pcm, &snd_pcm_devices, list)
1064 notify->n_register(pcm);
1066 mutex_unlock(®ister_mutex);
1070 EXPORT_SYMBOL(snd_pcm_notify);
1072 #ifdef CONFIG_PROC_FS
1077 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1078 struct snd_info_buffer *buffer)
1080 struct snd_pcm *pcm;
1082 mutex_lock(®ister_mutex);
1083 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1084 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1085 pcm->card->number, pcm->device, pcm->id, pcm->name);
1086 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1087 snd_iprintf(buffer, " : playback %i",
1088 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1089 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1090 snd_iprintf(buffer, " : capture %i",
1091 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1092 snd_iprintf(buffer, "\n");
1094 mutex_unlock(®ister_mutex);
1097 static struct snd_info_entry *snd_pcm_proc_entry;
1099 static void snd_pcm_proc_init(void)
1101 struct snd_info_entry *entry;
1103 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1104 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1105 if (snd_info_register(entry) < 0) {
1106 snd_info_free_entry(entry);
1110 snd_pcm_proc_entry = entry;
1113 static void snd_pcm_proc_done(void)
1115 snd_info_free_entry(snd_pcm_proc_entry);
1118 #else /* !CONFIG_PROC_FS */
1119 #define snd_pcm_proc_init()
1120 #define snd_pcm_proc_done()
1121 #endif /* CONFIG_PROC_FS */
1128 static int __init alsa_pcm_init(void)
1130 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1131 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1132 snd_pcm_proc_init();
1136 static void __exit alsa_pcm_exit(void)
1138 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1139 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1140 snd_pcm_proc_done();
1143 module_init(alsa_pcm_init)
1144 module_exit(alsa_pcm_exit)