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/module.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_get(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_next(struct snd_card *card, int device)
61 list_for_each_entry(pcm, &snd_pcm_devices, list) {
62 if (pcm->card == card && pcm->device > device)
64 else if (pcm->card->number > card->number)
70 static int snd_pcm_add(struct snd_pcm *newpcm)
74 list_for_each_entry(pcm, &snd_pcm_devices, list) {
75 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
77 if (pcm->card->number > newpcm->card->number ||
78 (pcm->card == newpcm->card &&
79 pcm->device > newpcm->device)) {
80 list_add(&newpcm->list, pcm->list.prev);
84 list_add_tail(&newpcm->list, &snd_pcm_devices);
88 static int snd_pcm_control_ioctl(struct snd_card *card,
89 struct snd_ctl_file *control,
90 unsigned int cmd, unsigned long arg)
93 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
97 if (get_user(device, (int __user *)arg))
99 mutex_lock(®ister_mutex);
100 device = snd_pcm_next(card, device);
101 mutex_unlock(®ister_mutex);
102 if (put_user(device, (int __user *)arg))
106 case SNDRV_CTL_IOCTL_PCM_INFO:
108 struct snd_pcm_info __user *info;
109 unsigned int device, subdevice;
112 struct snd_pcm_str *pstr;
113 struct snd_pcm_substream *substream;
116 info = (struct snd_pcm_info __user *)arg;
117 if (get_user(device, &info->device))
119 if (get_user(stream, &info->stream))
121 if (stream < 0 || stream > 1)
123 if (get_user(subdevice, &info->subdevice))
125 mutex_lock(®ister_mutex);
126 pcm = snd_pcm_get(card, device);
131 pstr = &pcm->streams[stream];
132 if (pstr->substream_count == 0) {
136 if (subdevice >= pstr->substream_count) {
140 for (substream = pstr->substream; substream;
141 substream = substream->next)
142 if (substream->number == (int)subdevice)
144 if (substream == NULL) {
148 err = snd_pcm_info_user(substream, info);
150 mutex_unlock(®ister_mutex);
153 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
157 if (get_user(val, (int __user *)arg))
159 control->prefer_pcm_subdevice = val;
166 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
168 static char *snd_pcm_format_names[] = {
187 FORMAT(IEC958_SUBFRAME_LE),
188 FORMAT(IEC958_SUBFRAME_BE),
213 const char *snd_pcm_format_name(snd_pcm_format_t format)
215 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
217 return snd_pcm_format_names[(__force unsigned int)format];
219 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
221 #ifdef CONFIG_SND_VERBOSE_PROCFS
223 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
224 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
225 #define READY(v) [SNDRV_PCM_READY_##v] = #v
226 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
227 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
228 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
229 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
230 #define START(v) [SNDRV_PCM_START_##v] = #v
231 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
233 static char *snd_pcm_stream_names[] = {
238 static char *snd_pcm_state_names[] = {
249 static char *snd_pcm_access_names[] = {
250 ACCESS(MMAP_INTERLEAVED),
251 ACCESS(MMAP_NONINTERLEAVED),
252 ACCESS(MMAP_COMPLEX),
253 ACCESS(RW_INTERLEAVED),
254 ACCESS(RW_NONINTERLEAVED),
257 static char *snd_pcm_subformat_names[] = {
261 static char *snd_pcm_tstamp_mode_names[] = {
266 static const char *snd_pcm_stream_name(int stream)
268 return snd_pcm_stream_names[stream];
271 static const char *snd_pcm_access_name(snd_pcm_access_t access)
273 return snd_pcm_access_names[(__force int)access];
276 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
278 return snd_pcm_subformat_names[(__force int)subformat];
281 static const char *snd_pcm_tstamp_mode_name(int mode)
283 return snd_pcm_tstamp_mode_names[mode];
286 static const char *snd_pcm_state_name(snd_pcm_state_t state)
288 return snd_pcm_state_names[(__force int)state];
291 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
292 #include <linux/soundcard.h>
294 static const char *snd_pcm_oss_format_name(int format)
323 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
324 struct snd_info_buffer *buffer)
326 struct snd_pcm_info *info;
332 info = kmalloc(sizeof(*info), GFP_KERNEL);
334 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
338 err = snd_pcm_info(substream, info);
340 snd_iprintf(buffer, "error %d\n", err);
344 snd_iprintf(buffer, "card: %d\n", info->card);
345 snd_iprintf(buffer, "device: %d\n", info->device);
346 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
347 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
348 snd_iprintf(buffer, "id: %s\n", info->id);
349 snd_iprintf(buffer, "name: %s\n", info->name);
350 snd_iprintf(buffer, "subname: %s\n", info->subname);
351 snd_iprintf(buffer, "class: %d\n", info->dev_class);
352 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
353 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
354 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
358 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
359 struct snd_info_buffer *buffer)
361 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
365 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
368 snd_pcm_proc_info_read(entry->private_data, buffer);
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;
377 mutex_lock(&substream->pcm->open_mutex);
378 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, "access: %s\n", snd_pcm_access_name(runtime->access));
388 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
389 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
390 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
391 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
392 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
393 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
395 if (substream->oss.oss) {
396 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
397 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
398 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
399 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
400 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
401 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
405 mutex_unlock(&substream->pcm->open_mutex);
408 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
409 struct snd_info_buffer *buffer)
411 struct snd_pcm_substream *substream = entry->private_data;
412 struct snd_pcm_runtime *runtime;
414 mutex_lock(&substream->pcm->open_mutex);
415 runtime = substream->runtime;
417 snd_iprintf(buffer, "closed\n");
420 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
421 snd_iprintf(buffer, "no setup\n");
424 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
425 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
426 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
427 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
428 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
429 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
430 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
431 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
433 mutex_unlock(&substream->pcm->open_mutex);
436 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
437 struct snd_info_buffer *buffer)
439 struct snd_pcm_substream *substream = entry->private_data;
440 struct snd_pcm_runtime *runtime;
441 struct snd_pcm_status status;
444 mutex_lock(&substream->pcm->open_mutex);
445 runtime = substream->runtime;
447 snd_iprintf(buffer, "closed\n");
450 memset(&status, 0, sizeof(status));
451 err = snd_pcm_status(substream, &status);
453 snd_iprintf(buffer, "error %d\n", err);
456 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
457 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
458 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
459 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
460 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
461 status.tstamp.tv_sec, status.tstamp.tv_nsec);
462 snd_iprintf(buffer, "delay : %ld\n", status.delay);
463 snd_iprintf(buffer, "avail : %ld\n", status.avail);
464 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
465 snd_iprintf(buffer, "-----\n");
466 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
467 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
469 mutex_unlock(&substream->pcm->open_mutex);
472 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
473 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
474 struct snd_info_buffer *buffer)
476 struct snd_pcm_str *pstr = entry->private_data;
477 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
480 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
481 struct snd_info_buffer *buffer)
483 struct snd_pcm_str *pstr = entry->private_data;
485 if (!snd_info_get_line(buffer, line, sizeof(line)))
486 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
490 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
492 struct snd_pcm *pcm = pstr->pcm;
493 struct snd_info_entry *entry;
496 sprintf(name, "pcm%i%c", pcm->device,
497 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
498 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
500 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
501 if (snd_info_register(entry) < 0) {
502 snd_info_free_entry(entry);
505 pstr->proc_root = entry;
507 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
508 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
509 if (snd_info_register(entry) < 0) {
510 snd_info_free_entry(entry);
514 pstr->proc_info_entry = entry;
516 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
517 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
518 pstr->proc_root)) != NULL) {
519 entry->c.text.read = snd_pcm_xrun_debug_read;
520 entry->c.text.write = snd_pcm_xrun_debug_write;
521 entry->mode |= S_IWUSR;
522 entry->private_data = pstr;
523 if (snd_info_register(entry) < 0) {
524 snd_info_free_entry(entry);
528 pstr->proc_xrun_debug_entry = entry;
533 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
535 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
536 snd_info_free_entry(pstr->proc_xrun_debug_entry);
537 pstr->proc_xrun_debug_entry = NULL;
539 snd_info_free_entry(pstr->proc_info_entry);
540 pstr->proc_info_entry = NULL;
541 snd_info_free_entry(pstr->proc_root);
542 pstr->proc_root = NULL;
546 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
548 struct snd_info_entry *entry;
549 struct snd_card *card;
552 card = substream->pcm->card;
554 sprintf(name, "sub%i", substream->number);
555 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
557 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
558 if (snd_info_register(entry) < 0) {
559 snd_info_free_entry(entry);
562 substream->proc_root = entry;
564 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
565 snd_info_set_text_ops(entry, substream,
566 snd_pcm_substream_proc_info_read);
567 if (snd_info_register(entry) < 0) {
568 snd_info_free_entry(entry);
572 substream->proc_info_entry = entry;
574 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
575 snd_info_set_text_ops(entry, substream,
576 snd_pcm_substream_proc_hw_params_read);
577 if (snd_info_register(entry) < 0) {
578 snd_info_free_entry(entry);
582 substream->proc_hw_params_entry = entry;
584 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
585 snd_info_set_text_ops(entry, substream,
586 snd_pcm_substream_proc_sw_params_read);
587 if (snd_info_register(entry) < 0) {
588 snd_info_free_entry(entry);
592 substream->proc_sw_params_entry = entry;
594 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
595 snd_info_set_text_ops(entry, substream,
596 snd_pcm_substream_proc_status_read);
597 if (snd_info_register(entry) < 0) {
598 snd_info_free_entry(entry);
602 substream->proc_status_entry = entry;
607 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
609 snd_info_free_entry(substream->proc_info_entry);
610 substream->proc_info_entry = NULL;
611 snd_info_free_entry(substream->proc_hw_params_entry);
612 substream->proc_hw_params_entry = NULL;
613 snd_info_free_entry(substream->proc_sw_params_entry);
614 substream->proc_sw_params_entry = NULL;
615 snd_info_free_entry(substream->proc_status_entry);
616 substream->proc_status_entry = NULL;
617 snd_info_free_entry(substream->proc_root);
618 substream->proc_root = NULL;
621 #else /* !CONFIG_SND_VERBOSE_PROCFS */
622 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
623 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
624 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
625 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
626 #endif /* CONFIG_SND_VERBOSE_PROCFS */
629 * snd_pcm_new_stream - create a new PCM stream
630 * @pcm: the pcm instance
631 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
632 * @substream_count: the number of substreams
634 * Creates a new stream for the pcm.
635 * The corresponding stream on the pcm must have been empty before
636 * calling this, i.e. zero must be given to the argument of
639 * Returns zero if successful, or a negative error code on failure.
641 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
644 struct snd_pcm_str *pstr = &pcm->streams[stream];
645 struct snd_pcm_substream *substream, *prev;
647 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
648 mutex_init(&pstr->oss.setup_mutex);
650 pstr->stream = stream;
652 pstr->substream_count = substream_count;
653 if (substream_count > 0 && !pcm->internal) {
654 err = snd_pcm_stream_proc_init(pstr);
656 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
661 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
662 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
663 if (substream == NULL) {
664 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
667 substream->pcm = pcm;
668 substream->pstr = pstr;
669 substream->number = idx;
670 substream->stream = stream;
671 sprintf(substream->name, "subdevice #%i", idx);
672 substream->buffer_bytes_max = UINT_MAX;
674 pstr->substream = substream;
676 prev->next = substream;
678 if (!pcm->internal) {
679 err = snd_pcm_substream_proc_init(substream);
681 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
683 pstr->substream = NULL;
690 substream->group = &substream->self_group;
691 spin_lock_init(&substream->self_group.lock);
692 INIT_LIST_HEAD(&substream->self_group.substreams);
693 list_add_tail(&substream->link_list, &substream->self_group.substreams);
694 atomic_set(&substream->mmap_count, 0);
700 EXPORT_SYMBOL(snd_pcm_new_stream);
702 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
703 int playback_count, int capture_count, bool internal,
704 struct snd_pcm **rpcm)
708 static struct snd_device_ops ops = {
709 .dev_free = snd_pcm_dev_free,
710 .dev_register = snd_pcm_dev_register,
711 .dev_disconnect = snd_pcm_dev_disconnect,
714 if (snd_BUG_ON(!card))
718 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
720 snd_printk(KERN_ERR "Cannot allocate PCM\n");
724 pcm->device = device;
725 pcm->internal = internal;
727 strlcpy(pcm->id, id, sizeof(pcm->id));
728 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
732 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
736 mutex_init(&pcm->open_mutex);
737 init_waitqueue_head(&pcm->open_wait);
738 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
748 * snd_pcm_new - create a new PCM instance
749 * @card: the card instance
751 * @device: the device index (zero based)
752 * @playback_count: the number of substreams for playback
753 * @capture_count: the number of substreams for capture
754 * @rpcm: the pointer to store the new pcm instance
756 * Creates a new PCM instance.
758 * The pcm operators have to be set afterwards to the new instance
759 * via snd_pcm_set_ops().
761 * Returns zero if successful, or a negative error code on failure.
763 int snd_pcm_new(struct snd_card *card, const char *id, int device,
764 int playback_count, int capture_count, struct snd_pcm **rpcm)
766 return _snd_pcm_new(card, id, device, playback_count, capture_count,
769 EXPORT_SYMBOL(snd_pcm_new);
772 * snd_pcm_new_internal - create a new internal PCM instance
773 * @card: the card instance
775 * @device: the device index (zero based - shared with normal PCMs)
776 * @playback_count: the number of substreams for playback
777 * @capture_count: the number of substreams for capture
778 * @rpcm: the pointer to store the new pcm instance
780 * Creates a new internal PCM instance with no userspace device or procfs
781 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
782 * will only be used internally by kernel drivers. i.e. it cannot be opened
783 * by userspace. It provides existing ASoC components drivers with a substream
784 * and access to any private data.
786 * The pcm operators have to be set afterwards to the new instance
787 * via snd_pcm_set_ops().
789 * Returns zero if successful, or a negative error code on failure.
791 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
792 int playback_count, int capture_count,
793 struct snd_pcm **rpcm)
795 return _snd_pcm_new(card, id, device, playback_count, capture_count,
798 EXPORT_SYMBOL(snd_pcm_new_internal);
800 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
802 struct snd_pcm_substream *substream, *substream_next;
803 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
804 struct snd_pcm_oss_setup *setup, *setupn;
806 substream = pstr->substream;
808 substream_next = substream->next;
809 snd_pcm_timer_done(substream);
810 snd_pcm_substream_proc_done(substream);
812 substream = substream_next;
814 snd_pcm_stream_proc_done(pstr);
815 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
816 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
817 setupn = setup->next;
818 kfree(setup->task_name);
824 static int snd_pcm_free(struct snd_pcm *pcm)
826 struct snd_pcm_notify *notify;
830 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
831 notify->n_unregister(pcm);
833 if (pcm->private_free)
834 pcm->private_free(pcm);
835 snd_pcm_lib_preallocate_free_for_all(pcm);
836 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
837 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
842 static int snd_pcm_dev_free(struct snd_device *device)
844 struct snd_pcm *pcm = device->device_data;
845 return snd_pcm_free(pcm);
848 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
850 struct snd_pcm_substream **rsubstream)
852 struct snd_pcm_str * pstr;
853 struct snd_pcm_substream *substream;
854 struct snd_pcm_runtime *runtime;
855 struct snd_ctl_file *kctl;
856 struct snd_card *card;
857 int prefer_subdevice = -1;
860 if (snd_BUG_ON(!pcm || !rsubstream))
863 pstr = &pcm->streams[stream];
864 if (pstr->substream == NULL || pstr->substream_count == 0)
868 read_lock(&card->ctl_files_rwlock);
869 list_for_each_entry(kctl, &card->ctl_files, list) {
870 if (kctl->pid == task_pid(current)) {
871 prefer_subdevice = kctl->prefer_pcm_subdevice;
872 if (prefer_subdevice != -1)
876 read_unlock(&card->ctl_files_rwlock);
879 case SNDRV_PCM_STREAM_PLAYBACK:
880 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
881 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
882 if (SUBSTREAM_BUSY(substream))
887 case SNDRV_PCM_STREAM_CAPTURE:
888 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
889 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
890 if (SUBSTREAM_BUSY(substream))
899 if (file->f_flags & O_APPEND) {
900 if (prefer_subdevice < 0) {
901 if (pstr->substream_count > 1)
902 return -EINVAL; /* must be unique */
903 substream = pstr->substream;
905 for (substream = pstr->substream; substream;
906 substream = substream->next)
907 if (substream->number == prefer_subdevice)
912 if (! SUBSTREAM_BUSY(substream))
914 substream->ref_count++;
915 *rsubstream = substream;
919 if (prefer_subdevice >= 0) {
920 for (substream = pstr->substream; substream; substream = substream->next)
921 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
924 for (substream = pstr->substream; substream; substream = substream->next)
925 if (!SUBSTREAM_BUSY(substream))
928 if (substream == NULL)
931 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
935 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
936 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
937 if (runtime->status == NULL) {
941 memset((void*)runtime->status, 0, size);
943 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
944 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
945 if (runtime->control == NULL) {
946 snd_free_pages((void*)runtime->status,
947 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
951 memset((void*)runtime->control, 0, size);
953 init_waitqueue_head(&runtime->sleep);
954 init_waitqueue_head(&runtime->tsleep);
956 runtime->status->state = SNDRV_PCM_STATE_OPEN;
958 substream->runtime = runtime;
959 substream->private_data = pcm->private_data;
960 substream->ref_count = 1;
961 substream->f_flags = file->f_flags;
962 substream->pid = get_pid(task_pid(current));
963 pstr->substream_opened++;
964 *rsubstream = substream;
968 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
970 struct snd_pcm_runtime *runtime;
972 if (PCM_RUNTIME_CHECK(substream))
974 runtime = substream->runtime;
975 if (runtime->private_free != NULL)
976 runtime->private_free(runtime);
977 snd_free_pages((void*)runtime->status,
978 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
979 snd_free_pages((void*)runtime->control,
980 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
981 kfree(runtime->hw_constraints.rules);
982 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
983 if (runtime->hwptr_log)
984 kfree(runtime->hwptr_log);
987 substream->runtime = NULL;
988 put_pid(substream->pid);
989 substream->pid = NULL;
990 substream->pstr->substream_opened--;
993 static ssize_t show_pcm_class(struct device *dev,
994 struct device_attribute *attr, char *buf)
998 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
999 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1000 [SNDRV_PCM_CLASS_MULTI] = "multi",
1001 [SNDRV_PCM_CLASS_MODEM] = "modem",
1002 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1005 if (! (pcm = dev_get_drvdata(dev)) ||
1006 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1009 str = strs[pcm->dev_class];
1010 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1013 static struct device_attribute pcm_attrs =
1014 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1016 static int snd_pcm_dev_register(struct snd_device *device)
1019 struct snd_pcm_substream *substream;
1020 struct snd_pcm_notify *notify;
1022 struct snd_pcm *pcm;
1025 if (snd_BUG_ON(!device || !device->device_data))
1027 pcm = device->device_data;
1028 mutex_lock(®ister_mutex);
1029 err = snd_pcm_add(pcm);
1031 mutex_unlock(®ister_mutex);
1034 for (cidx = 0; cidx < 2; cidx++) {
1036 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1039 case SNDRV_PCM_STREAM_PLAYBACK:
1040 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1041 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1043 case SNDRV_PCM_STREAM_CAPTURE:
1044 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1045 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1048 /* device pointer to use, pcm->dev takes precedence if
1049 * it is assigned, otherwise fall back to card's device
1053 dev = snd_card_get_device_link(pcm->card);
1055 err = snd_register_device_for_dev(devtype, pcm->card,
1057 &snd_pcm_f_ops[cidx],
1060 list_del(&pcm->list);
1061 mutex_unlock(®ister_mutex);
1064 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1066 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1067 snd_pcm_timer_init(substream);
1070 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1071 notify->n_register(pcm);
1073 mutex_unlock(®ister_mutex);
1077 static int snd_pcm_dev_disconnect(struct snd_device *device)
1079 struct snd_pcm *pcm = device->device_data;
1080 struct snd_pcm_notify *notify;
1081 struct snd_pcm_substream *substream;
1084 mutex_lock(®ister_mutex);
1085 if (list_empty(&pcm->list))
1088 list_del_init(&pcm->list);
1089 for (cidx = 0; cidx < 2; cidx++)
1090 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1091 if (substream->runtime)
1092 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1093 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1094 notify->n_disconnect(pcm);
1096 for (cidx = 0; cidx < 2; cidx++) {
1099 case SNDRV_PCM_STREAM_PLAYBACK:
1100 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1102 case SNDRV_PCM_STREAM_CAPTURE:
1103 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1106 snd_unregister_device(devtype, pcm->card, pcm->device);
1109 mutex_unlock(®ister_mutex);
1113 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1115 struct snd_pcm *pcm;
1117 if (snd_BUG_ON(!notify ||
1118 !notify->n_register ||
1119 !notify->n_unregister ||
1120 !notify->n_disconnect))
1122 mutex_lock(®ister_mutex);
1124 list_del(¬ify->list);
1125 list_for_each_entry(pcm, &snd_pcm_devices, list)
1126 notify->n_unregister(pcm);
1128 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1129 list_for_each_entry(pcm, &snd_pcm_devices, list)
1130 notify->n_register(pcm);
1132 mutex_unlock(®ister_mutex);
1136 EXPORT_SYMBOL(snd_pcm_notify);
1138 #ifdef CONFIG_PROC_FS
1143 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1144 struct snd_info_buffer *buffer)
1146 struct snd_pcm *pcm;
1148 mutex_lock(®ister_mutex);
1149 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1150 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1151 pcm->card->number, pcm->device, pcm->id, pcm->name);
1152 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1153 snd_iprintf(buffer, " : playback %i",
1154 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1155 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1156 snd_iprintf(buffer, " : capture %i",
1157 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1158 snd_iprintf(buffer, "\n");
1160 mutex_unlock(®ister_mutex);
1163 static struct snd_info_entry *snd_pcm_proc_entry;
1165 static void snd_pcm_proc_init(void)
1167 struct snd_info_entry *entry;
1169 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1170 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1171 if (snd_info_register(entry) < 0) {
1172 snd_info_free_entry(entry);
1176 snd_pcm_proc_entry = entry;
1179 static void snd_pcm_proc_done(void)
1181 snd_info_free_entry(snd_pcm_proc_entry);
1184 #else /* !CONFIG_PROC_FS */
1185 #define snd_pcm_proc_init()
1186 #define snd_pcm_proc_done()
1187 #endif /* CONFIG_PROC_FS */
1194 static int __init alsa_pcm_init(void)
1196 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1197 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1198 snd_pcm_proc_init();
1202 static void __exit alsa_pcm_exit(void)
1204 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1205 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1206 snd_pcm_proc_done();
1209 module_init(alsa_pcm_init)
1210 module_exit(alsa_pcm_exit)