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 <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@perex.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)
50 list_for_each_entry(pcm, &snd_pcm_devices, list) {
51 if (pcm->card == card && pcm->device == device)
57 static int snd_pcm_control_ioctl(struct snd_card *card,
58 struct snd_ctl_file *control,
59 unsigned int cmd, unsigned long arg)
62 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
66 if (get_user(device, (int __user *)arg))
68 mutex_lock(®ister_mutex);
69 device = device < 0 ? 0 : device + 1;
70 while (device < SNDRV_PCM_DEVICES) {
71 if (snd_pcm_search(card, device))
75 if (device == SNDRV_PCM_DEVICES)
77 mutex_unlock(®ister_mutex);
78 if (put_user(device, (int __user *)arg))
82 case SNDRV_CTL_IOCTL_PCM_INFO:
84 struct snd_pcm_info __user *info;
85 unsigned int device, subdevice;
88 struct snd_pcm_str *pstr;
89 struct snd_pcm_substream *substream;
92 info = (struct snd_pcm_info __user *)arg;
93 if (get_user(device, &info->device))
95 if (get_user(stream, &info->stream))
97 if (stream < 0 || stream > 1)
99 if (get_user(subdevice, &info->subdevice))
101 mutex_lock(®ister_mutex);
102 pcm = snd_pcm_search(card, device);
107 pstr = &pcm->streams[stream];
108 if (pstr->substream_count == 0) {
112 if (subdevice >= pstr->substream_count) {
116 for (substream = pstr->substream; substream;
117 substream = substream->next)
118 if (substream->number == (int)subdevice)
120 if (substream == NULL) {
124 err = snd_pcm_info_user(substream, info);
126 mutex_unlock(®ister_mutex);
129 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
133 if (get_user(val, (int __user *)arg))
135 control->prefer_pcm_subdevice = val;
142 #ifdef CONFIG_SND_VERBOSE_PROCFS
144 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
145 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
146 #define READY(v) [SNDRV_PCM_READY_##v] = #v
147 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
148 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
149 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
150 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
151 #define START(v) [SNDRV_PCM_START_##v] = #v
152 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
153 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
155 static char *snd_pcm_format_names[] = {
174 FORMAT(IEC958_SUBFRAME_LE),
175 FORMAT(IEC958_SUBFRAME_BE),
196 static const char *snd_pcm_format_name(snd_pcm_format_t format)
198 return snd_pcm_format_names[format];
201 static char *snd_pcm_stream_names[] = {
206 static char *snd_pcm_state_names[] = {
217 static char *snd_pcm_access_names[] = {
218 ACCESS(MMAP_INTERLEAVED),
219 ACCESS(MMAP_NONINTERLEAVED),
220 ACCESS(MMAP_COMPLEX),
221 ACCESS(RW_INTERLEAVED),
222 ACCESS(RW_NONINTERLEAVED),
225 static char *snd_pcm_subformat_names[] = {
229 static char *snd_pcm_tstamp_mode_names[] = {
234 static const char *snd_pcm_stream_name(int stream)
236 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
237 return snd_pcm_stream_names[stream];
240 static const char *snd_pcm_access_name(snd_pcm_access_t access)
242 return snd_pcm_access_names[access];
245 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
247 return snd_pcm_subformat_names[subformat];
250 static const char *snd_pcm_tstamp_mode_name(int mode)
252 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
253 return snd_pcm_tstamp_mode_names[mode];
256 static const char *snd_pcm_state_name(snd_pcm_state_t state)
258 return snd_pcm_state_names[state];
261 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
262 #include <linux/soundcard.h>
264 static const char *snd_pcm_oss_format_name(int format)
293 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
294 struct snd_info_buffer *buffer)
296 struct snd_pcm_info *info;
302 info = kmalloc(sizeof(*info), GFP_KERNEL);
304 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
308 err = snd_pcm_info(substream, info);
310 snd_iprintf(buffer, "error %d\n", err);
314 snd_iprintf(buffer, "card: %d\n", info->card);
315 snd_iprintf(buffer, "device: %d\n", info->device);
316 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
317 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
318 snd_iprintf(buffer, "id: %s\n", info->id);
319 snd_iprintf(buffer, "name: %s\n", info->name);
320 snd_iprintf(buffer, "subname: %s\n", info->subname);
321 snd_iprintf(buffer, "class: %d\n", info->dev_class);
322 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
323 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
324 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
328 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
329 struct snd_info_buffer *buffer)
331 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
335 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
336 struct snd_info_buffer *buffer)
338 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
342 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
343 struct snd_info_buffer *buffer)
345 struct snd_pcm_substream *substream = entry->private_data;
346 struct snd_pcm_runtime *runtime = substream->runtime;
348 snd_iprintf(buffer, "closed\n");
351 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
352 snd_iprintf(buffer, "no setup\n");
355 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
356 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
357 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
358 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
359 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
360 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
361 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
362 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
363 if (substream->oss.oss) {
364 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
365 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
366 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
367 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
368 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
369 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
374 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
375 struct snd_info_buffer *buffer)
377 struct snd_pcm_substream *substream = entry->private_data;
378 struct snd_pcm_runtime *runtime = substream->runtime;
380 snd_iprintf(buffer, "closed\n");
383 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
384 snd_iprintf(buffer, "no setup\n");
387 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
388 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
389 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
390 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
391 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
392 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
393 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
394 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
397 static void snd_pcm_substream_proc_status_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;
402 struct snd_pcm_status status;
405 snd_iprintf(buffer, "closed\n");
408 memset(&status, 0, sizeof(status));
409 err = snd_pcm_status(substream, &status);
411 snd_iprintf(buffer, "error %d\n", err);
414 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
415 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
416 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
417 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
418 status.tstamp.tv_sec, status.tstamp.tv_nsec);
419 snd_iprintf(buffer, "delay : %ld\n", status.delay);
420 snd_iprintf(buffer, "avail : %ld\n", status.avail);
421 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
422 snd_iprintf(buffer, "-----\n");
423 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
424 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
427 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
428 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
429 struct snd_info_buffer *buffer)
431 struct snd_pcm_str *pstr = entry->private_data;
432 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
435 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
436 struct snd_info_buffer *buffer)
438 struct snd_pcm_str *pstr = entry->private_data;
440 if (!snd_info_get_line(buffer, line, sizeof(line)))
441 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
445 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
447 struct snd_pcm *pcm = pstr->pcm;
448 struct snd_info_entry *entry;
451 sprintf(name, "pcm%i%c", pcm->device,
452 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
453 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
455 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
456 if (snd_info_register(entry) < 0) {
457 snd_info_free_entry(entry);
460 pstr->proc_root = entry;
462 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
463 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
464 if (snd_info_register(entry) < 0) {
465 snd_info_free_entry(entry);
469 pstr->proc_info_entry = entry;
471 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
472 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
473 pstr->proc_root)) != NULL) {
474 entry->c.text.read = snd_pcm_xrun_debug_read;
475 entry->c.text.write = snd_pcm_xrun_debug_write;
476 entry->mode |= S_IWUSR;
477 entry->private_data = pstr;
478 if (snd_info_register(entry) < 0) {
479 snd_info_free_entry(entry);
483 pstr->proc_xrun_debug_entry = entry;
488 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
490 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
491 snd_info_free_entry(pstr->proc_xrun_debug_entry);
492 pstr->proc_xrun_debug_entry = NULL;
494 snd_info_free_entry(pstr->proc_info_entry);
495 pstr->proc_info_entry = NULL;
496 snd_info_free_entry(pstr->proc_root);
497 pstr->proc_root = NULL;
501 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
503 struct snd_info_entry *entry;
504 struct snd_card *card;
507 card = substream->pcm->card;
509 sprintf(name, "sub%i", substream->number);
510 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
512 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
513 if (snd_info_register(entry) < 0) {
514 snd_info_free_entry(entry);
517 substream->proc_root = entry;
519 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
520 snd_info_set_text_ops(entry, substream,
521 snd_pcm_substream_proc_info_read);
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
527 substream->proc_info_entry = entry;
529 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
530 snd_info_set_text_ops(entry, substream,
531 snd_pcm_substream_proc_hw_params_read);
532 if (snd_info_register(entry) < 0) {
533 snd_info_free_entry(entry);
537 substream->proc_hw_params_entry = entry;
539 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
540 snd_info_set_text_ops(entry, substream,
541 snd_pcm_substream_proc_sw_params_read);
542 if (snd_info_register(entry) < 0) {
543 snd_info_free_entry(entry);
547 substream->proc_sw_params_entry = entry;
549 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
550 snd_info_set_text_ops(entry, substream,
551 snd_pcm_substream_proc_status_read);
552 if (snd_info_register(entry) < 0) {
553 snd_info_free_entry(entry);
557 substream->proc_status_entry = entry;
562 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
564 snd_info_free_entry(substream->proc_info_entry);
565 substream->proc_info_entry = NULL;
566 snd_info_free_entry(substream->proc_hw_params_entry);
567 substream->proc_hw_params_entry = NULL;
568 snd_info_free_entry(substream->proc_sw_params_entry);
569 substream->proc_sw_params_entry = NULL;
570 snd_info_free_entry(substream->proc_status_entry);
571 substream->proc_status_entry = NULL;
572 snd_info_free_entry(substream->proc_root);
573 substream->proc_root = NULL;
576 #else /* !CONFIG_SND_VERBOSE_PROCFS */
577 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
578 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
579 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
580 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
581 #endif /* CONFIG_SND_VERBOSE_PROCFS */
584 * snd_pcm_new_stream - create a new PCM stream
585 * @pcm: the pcm instance
586 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
587 * @substream_count: the number of substreams
589 * Creates a new stream for the pcm.
590 * The corresponding stream on the pcm must have been empty before
591 * calling this, i.e. zero must be given to the argument of
594 * Returns zero if successful, or a negative error code on failure.
596 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
599 struct snd_pcm_str *pstr = &pcm->streams[stream];
600 struct snd_pcm_substream *substream, *prev;
602 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
603 mutex_init(&pstr->oss.setup_mutex);
605 pstr->stream = stream;
607 pstr->substream_count = substream_count;
608 if (substream_count > 0) {
609 err = snd_pcm_stream_proc_init(pstr);
611 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
616 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
617 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
618 if (substream == NULL) {
619 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
622 substream->pcm = pcm;
623 substream->pstr = pstr;
624 substream->number = idx;
625 substream->stream = stream;
626 sprintf(substream->name, "subdevice #%i", idx);
627 snprintf(substream->latency_id, sizeof(substream->latency_id),
628 "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
629 (stream ? 'c' : 'p'), idx);
630 substream->buffer_bytes_max = UINT_MAX;
632 pstr->substream = substream;
634 prev->next = substream;
635 err = snd_pcm_substream_proc_init(substream);
637 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
639 pstr->substream = NULL;
645 substream->group = &substream->self_group;
646 spin_lock_init(&substream->self_group.lock);
647 INIT_LIST_HEAD(&substream->self_group.substreams);
648 list_add_tail(&substream->link_list, &substream->self_group.substreams);
649 spin_lock_init(&substream->timer_lock);
650 atomic_set(&substream->mmap_count, 0);
656 EXPORT_SYMBOL(snd_pcm_new_stream);
659 * snd_pcm_new - create a new PCM instance
660 * @card: the card instance
662 * @device: the device index (zero based)
663 * @playback_count: the number of substreams for playback
664 * @capture_count: the number of substreams for capture
665 * @rpcm: the pointer to store the new pcm instance
667 * Creates a new PCM instance.
669 * The pcm operators have to be set afterwards to the new instance
670 * via snd_pcm_set_ops().
672 * Returns zero if successful, or a negative error code on failure.
674 int snd_pcm_new(struct snd_card *card, char *id, int device,
675 int playback_count, int capture_count,
676 struct snd_pcm ** rpcm)
680 static struct snd_device_ops ops = {
681 .dev_free = snd_pcm_dev_free,
682 .dev_register = snd_pcm_dev_register,
683 .dev_disconnect = snd_pcm_dev_disconnect,
686 snd_assert(rpcm != NULL, return -EINVAL);
688 snd_assert(card != NULL, return -ENXIO);
689 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
691 snd_printk(KERN_ERR "Cannot allocate PCM\n");
695 pcm->device = device;
697 strlcpy(pcm->id, id, sizeof(pcm->id));
698 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
702 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
706 mutex_init(&pcm->open_mutex);
707 init_waitqueue_head(&pcm->open_wait);
708 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
716 EXPORT_SYMBOL(snd_pcm_new);
718 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
720 struct snd_pcm_substream *substream, *substream_next;
721 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
722 struct snd_pcm_oss_setup *setup, *setupn;
724 substream = pstr->substream;
726 substream_next = substream->next;
727 snd_pcm_timer_done(substream);
728 snd_pcm_substream_proc_done(substream);
730 substream = substream_next;
732 snd_pcm_stream_proc_done(pstr);
733 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
734 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
735 setupn = setup->next;
736 kfree(setup->task_name);
742 static int snd_pcm_free(struct snd_pcm *pcm)
744 struct snd_pcm_notify *notify;
746 snd_assert(pcm != NULL, return -ENXIO);
747 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
748 notify->n_unregister(pcm);
750 if (pcm->private_free)
751 pcm->private_free(pcm);
752 snd_pcm_lib_preallocate_free_for_all(pcm);
753 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
754 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
759 static int snd_pcm_dev_free(struct snd_device *device)
761 struct snd_pcm *pcm = device->device_data;
762 return snd_pcm_free(pcm);
765 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
767 struct snd_pcm_substream **rsubstream)
769 struct snd_pcm_str * pstr;
770 struct snd_pcm_substream *substream;
771 struct snd_pcm_runtime *runtime;
772 struct snd_ctl_file *kctl;
773 struct snd_card *card;
774 int prefer_subdevice = -1;
777 snd_assert(rsubstream != NULL, return -EINVAL);
779 snd_assert(pcm != NULL, return -ENXIO);
780 pstr = &pcm->streams[stream];
781 if (pstr->substream == NULL || pstr->substream_count == 0)
785 down_read(&card->controls_rwsem);
786 list_for_each_entry(kctl, &card->ctl_files, list) {
787 if (kctl->pid == current->pid) {
788 prefer_subdevice = kctl->prefer_pcm_subdevice;
789 if (prefer_subdevice != -1)
793 up_read(&card->controls_rwsem);
796 case SNDRV_PCM_STREAM_PLAYBACK:
797 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
798 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
799 if (SUBSTREAM_BUSY(substream))
804 case SNDRV_PCM_STREAM_CAPTURE:
805 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
806 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
807 if (SUBSTREAM_BUSY(substream))
816 if (file->f_flags & O_APPEND) {
817 if (prefer_subdevice < 0) {
818 if (pstr->substream_count > 1)
819 return -EINVAL; /* must be unique */
820 substream = pstr->substream;
822 for (substream = pstr->substream; substream;
823 substream = substream->next)
824 if (substream->number == prefer_subdevice)
829 if (! SUBSTREAM_BUSY(substream))
831 substream->ref_count++;
832 *rsubstream = substream;
836 if (prefer_subdevice >= 0) {
837 for (substream = pstr->substream; substream; substream = substream->next)
838 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
841 for (substream = pstr->substream; substream; substream = substream->next)
842 if (!SUBSTREAM_BUSY(substream))
845 if (substream == NULL)
848 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
852 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
853 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
854 if (runtime->status == NULL) {
858 memset((void*)runtime->status, 0, size);
860 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
861 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
862 if (runtime->control == NULL) {
863 snd_free_pages((void*)runtime->status,
864 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
868 memset((void*)runtime->control, 0, size);
870 init_waitqueue_head(&runtime->sleep);
872 runtime->status->state = SNDRV_PCM_STATE_OPEN;
874 substream->runtime = runtime;
875 substream->private_data = pcm->private_data;
876 substream->ref_count = 1;
877 substream->f_flags = file->f_flags;
878 pstr->substream_opened++;
879 *rsubstream = substream;
883 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
885 struct snd_pcm_runtime *runtime;
887 runtime = substream->runtime;
888 snd_assert(runtime != NULL, return);
889 if (runtime->private_free != NULL)
890 runtime->private_free(runtime);
891 snd_free_pages((void*)runtime->status,
892 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
893 snd_free_pages((void*)runtime->control,
894 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
895 kfree(runtime->hw_constraints.rules);
897 substream->runtime = NULL;
898 substream->pstr->substream_opened--;
901 static ssize_t show_pcm_class(struct device *dev,
902 struct device_attribute *attr, char *buf)
906 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
907 [SNDRV_PCM_CLASS_GENERIC] = "generic",
908 [SNDRV_PCM_CLASS_MULTI] = "multi",
909 [SNDRV_PCM_CLASS_MODEM] = "modem",
910 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
913 if (! (pcm = dev_get_drvdata(dev)) ||
914 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
917 str = strs[pcm->dev_class];
918 return snprintf(buf, PAGE_SIZE, "%s\n", str);
921 static struct device_attribute pcm_attrs =
922 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
924 static int snd_pcm_dev_register(struct snd_device *device)
927 struct snd_pcm_substream *substream;
928 struct snd_pcm_notify *notify;
930 struct snd_pcm *pcm = device->device_data;
933 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
934 mutex_lock(®ister_mutex);
935 if (snd_pcm_search(pcm->card, pcm->device)) {
936 mutex_unlock(®ister_mutex);
939 list_add_tail(&pcm->list, &snd_pcm_devices);
940 for (cidx = 0; cidx < 2; cidx++) {
942 if (pcm->streams[cidx].substream == NULL)
945 case SNDRV_PCM_STREAM_PLAYBACK:
946 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
947 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
949 case SNDRV_PCM_STREAM_CAPTURE:
950 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
951 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
954 /* device pointer to use, pcm->dev takes precedence if
955 * it is assigned, otherwise fall back to card's device
959 dev = snd_card_get_device_link(pcm->card);
961 err = snd_register_device_for_dev(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);
976 list_for_each_entry(notify, &snd_pcm_notify_list, list)
977 notify->n_register(pcm);
979 mutex_unlock(®ister_mutex);
983 static int snd_pcm_dev_disconnect(struct snd_device *device)
985 struct snd_pcm *pcm = device->device_data;
986 struct snd_pcm_notify *notify;
987 struct snd_pcm_substream *substream;
990 mutex_lock(®ister_mutex);
991 if (list_empty(&pcm->list))
994 list_del_init(&pcm->list);
995 for (cidx = 0; cidx < 2; cidx++)
996 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
997 if (substream->runtime)
998 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
999 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1000 notify->n_disconnect(pcm);
1002 for (cidx = 0; cidx < 2; cidx++) {
1005 case SNDRV_PCM_STREAM_PLAYBACK:
1006 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1008 case SNDRV_PCM_STREAM_CAPTURE:
1009 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1012 snd_unregister_device(devtype, pcm->card, pcm->device);
1015 mutex_unlock(®ister_mutex);
1019 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1021 struct snd_pcm *pcm;
1023 snd_assert(notify != NULL &&
1024 notify->n_register != NULL &&
1025 notify->n_unregister != NULL &&
1026 notify->n_disconnect, return -EINVAL);
1027 mutex_lock(®ister_mutex);
1029 list_del(¬ify->list);
1030 list_for_each_entry(pcm, &snd_pcm_devices, list)
1031 notify->n_unregister(pcm);
1033 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1034 list_for_each_entry(pcm, &snd_pcm_devices, list)
1035 notify->n_register(pcm);
1037 mutex_unlock(®ister_mutex);
1041 EXPORT_SYMBOL(snd_pcm_notify);
1043 #ifdef CONFIG_PROC_FS
1048 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1049 struct snd_info_buffer *buffer)
1051 struct snd_pcm *pcm;
1053 mutex_lock(®ister_mutex);
1054 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1055 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1056 pcm->card->number, pcm->device, pcm->id, pcm->name);
1057 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1058 snd_iprintf(buffer, " : playback %i",
1059 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1060 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1061 snd_iprintf(buffer, " : capture %i",
1062 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1063 snd_iprintf(buffer, "\n");
1065 mutex_unlock(®ister_mutex);
1068 static struct snd_info_entry *snd_pcm_proc_entry;
1070 static void snd_pcm_proc_init(void)
1072 struct snd_info_entry *entry;
1074 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1075 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1076 if (snd_info_register(entry) < 0) {
1077 snd_info_free_entry(entry);
1081 snd_pcm_proc_entry = entry;
1084 static void snd_pcm_proc_done(void)
1086 snd_info_free_entry(snd_pcm_proc_entry);
1089 #else /* !CONFIG_PROC_FS */
1090 #define snd_pcm_proc_init()
1091 #define snd_pcm_proc_done()
1092 #endif /* CONFIG_PROC_FS */
1099 static int __init alsa_pcm_init(void)
1101 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1102 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1103 snd_pcm_proc_init();
1107 static void __exit alsa_pcm_exit(void)
1109 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1110 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1111 snd_pcm_proc_done();
1114 module_init(alsa_pcm_init)
1115 module_exit(alsa_pcm_exit)