2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <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@suse.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 DECLARE_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);
44 static int snd_pcm_dev_unregister(struct snd_device *device);
46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
51 list_for_each(p, &snd_pcm_devices) {
52 pcm = list_entry(p, struct snd_pcm, list);
53 if (pcm->card == card && pcm->device == device)
59 static int snd_pcm_control_ioctl(struct snd_card *card,
60 struct snd_ctl_file *control,
61 unsigned int cmd, unsigned long arg)
64 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
68 if (get_user(device, (int __user *)arg))
70 down(®ister_mutex);
71 device = device < 0 ? 0 : device + 1;
72 while (device < SNDRV_PCM_DEVICES) {
73 if (snd_pcm_search(card, device))
77 if (device == SNDRV_PCM_DEVICES)
80 if (put_user(device, (int __user *)arg))
84 case SNDRV_CTL_IOCTL_PCM_INFO:
86 struct snd_pcm_info __user *info;
87 unsigned int device, subdevice;
90 struct snd_pcm_str *pstr;
91 struct snd_pcm_substream *substream;
94 info = (struct snd_pcm_info __user *)arg;
95 if (get_user(device, &info->device))
97 if (get_user(stream, &info->stream))
99 if (stream < 0 || stream > 1)
101 if (get_user(subdevice, &info->subdevice))
103 down(®ister_mutex);
104 pcm = snd_pcm_search(card, device);
109 pstr = &pcm->streams[stream];
110 if (pstr->substream_count == 0) {
114 if (subdevice >= pstr->substream_count) {
118 for (substream = pstr->substream; substream;
119 substream = substream->next)
120 if (substream->number == (int)subdevice)
122 if (substream == NULL) {
126 err = snd_pcm_info_user(substream, info);
131 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
135 if (get_user(val, (int __user *)arg))
137 control->prefer_pcm_subdevice = val;
143 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
144 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
145 #define READY(v) [SNDRV_PCM_READY_##v] = #v
146 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
147 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
148 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
149 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
150 #define START(v) [SNDRV_PCM_START_##v] = #v
151 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
152 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
154 static char *snd_pcm_stream_names[] = {
159 static char *snd_pcm_state_names[] = {
170 static char *snd_pcm_access_names[] = {
171 ACCESS(MMAP_INTERLEAVED),
172 ACCESS(MMAP_NONINTERLEAVED),
173 ACCESS(MMAP_COMPLEX),
174 ACCESS(RW_INTERLEAVED),
175 ACCESS(RW_NONINTERLEAVED),
178 static char *snd_pcm_format_names[] = {
197 FORMAT(IEC958_SUBFRAME_LE),
198 FORMAT(IEC958_SUBFRAME_BE),
219 static char *snd_pcm_subformat_names[] = {
223 static char *snd_pcm_tstamp_mode_names[] = {
228 static const char *snd_pcm_stream_name(int stream)
230 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
231 return snd_pcm_stream_names[stream];
234 static const char *snd_pcm_access_name(snd_pcm_access_t access)
236 return snd_pcm_access_names[access];
239 const char *snd_pcm_format_name(snd_pcm_format_t format)
241 return snd_pcm_format_names[format];
244 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
246 return snd_pcm_subformat_names[subformat];
249 static const char *snd_pcm_tstamp_mode_name(int mode)
251 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
252 return snd_pcm_tstamp_mode_names[mode];
255 static const char *snd_pcm_state_name(snd_pcm_state_t state)
257 return snd_pcm_state_names[state];
260 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
261 #include <linux/soundcard.h>
262 static const char *snd_pcm_oss_format_name(int format)
291 #ifdef CONFIG_PROC_FS
292 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
293 struct snd_info_buffer *buffer)
295 struct snd_pcm_info *info;
301 info = kmalloc(sizeof(*info), GFP_KERNEL);
303 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
307 err = snd_pcm_info(substream, info);
309 snd_iprintf(buffer, "error %d\n", err);
313 snd_iprintf(buffer, "card: %d\n", info->card);
314 snd_iprintf(buffer, "device: %d\n", info->device);
315 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
316 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
317 snd_iprintf(buffer, "id: %s\n", info->id);
318 snd_iprintf(buffer, "name: %s\n", info->name);
319 snd_iprintf(buffer, "subname: %s\n", info->subname);
320 snd_iprintf(buffer, "class: %d\n", info->dev_class);
321 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
322 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
323 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
327 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
328 struct snd_info_buffer *buffer)
330 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
334 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
335 struct snd_info_buffer *buffer)
337 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
341 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
342 struct snd_info_buffer *buffer)
344 struct snd_pcm_substream *substream = entry->private_data;
345 struct snd_pcm_runtime *runtime = substream->runtime;
347 snd_iprintf(buffer, "closed\n");
350 snd_pcm_stream_lock_irq(substream);
351 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
352 snd_iprintf(buffer, "no setup\n");
353 snd_pcm_stream_unlock_irq(substream);
356 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
357 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
358 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
359 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
360 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
361 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
362 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
363 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
364 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
365 if (substream->oss.oss) {
366 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
367 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
368 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
369 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
370 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
371 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
374 snd_pcm_stream_unlock_irq(substream);
377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
378 struct snd_info_buffer *buffer)
380 struct snd_pcm_substream *substream = entry->private_data;
381 struct snd_pcm_runtime *runtime = substream->runtime;
383 snd_iprintf(buffer, "closed\n");
386 snd_pcm_stream_lock_irq(substream);
387 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
388 snd_iprintf(buffer, "no setup\n");
389 snd_pcm_stream_unlock_irq(substream);
392 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
393 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
394 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
395 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
396 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
397 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
398 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
399 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
400 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
401 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
402 snd_pcm_stream_unlock_irq(substream);
405 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
406 struct snd_info_buffer *buffer)
408 struct snd_pcm_substream *substream = entry->private_data;
409 struct snd_pcm_runtime *runtime = substream->runtime;
410 struct snd_pcm_status status;
413 snd_iprintf(buffer, "closed\n");
416 memset(&status, 0, sizeof(status));
417 err = snd_pcm_status(substream, &status);
419 snd_iprintf(buffer, "error %d\n", err);
422 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
423 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
424 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
425 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
426 status.tstamp.tv_sec, status.tstamp.tv_nsec);
427 snd_iprintf(buffer, "delay : %ld\n", status.delay);
428 snd_iprintf(buffer, "avail : %ld\n", status.avail);
429 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
430 snd_iprintf(buffer, "-----\n");
431 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
432 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
436 #ifdef CONFIG_SND_DEBUG
437 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
438 struct snd_info_buffer *buffer)
440 struct snd_pcm_str *pstr = entry->private_data;
441 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
444 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
445 struct snd_info_buffer *buffer)
447 struct snd_pcm_str *pstr = entry->private_data;
449 if (!snd_info_get_line(buffer, line, sizeof(line)))
450 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
454 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
456 struct snd_pcm *pcm = pstr->pcm;
457 struct snd_info_entry *entry;
460 sprintf(name, "pcm%i%c", pcm->device,
461 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
462 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
464 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
465 if (snd_info_register(entry) < 0) {
466 snd_info_free_entry(entry);
469 pstr->proc_root = entry;
471 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
472 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
473 if (snd_info_register(entry) < 0) {
474 snd_info_free_entry(entry);
478 pstr->proc_info_entry = entry;
480 #ifdef CONFIG_SND_DEBUG
481 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
482 pstr->proc_root)) != NULL) {
483 entry->c.text.read_size = 64;
484 entry->c.text.read = snd_pcm_xrun_debug_read;
485 entry->c.text.write_size = 64;
486 entry->c.text.write = snd_pcm_xrun_debug_write;
487 entry->mode |= S_IWUSR;
488 entry->private_data = pstr;
489 if (snd_info_register(entry) < 0) {
490 snd_info_free_entry(entry);
494 pstr->proc_xrun_debug_entry = entry;
499 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
501 #ifdef CONFIG_SND_DEBUG
502 if (pstr->proc_xrun_debug_entry) {
503 snd_info_unregister(pstr->proc_xrun_debug_entry);
504 pstr->proc_xrun_debug_entry = NULL;
507 if (pstr->proc_info_entry) {
508 snd_info_unregister(pstr->proc_info_entry);
509 pstr->proc_info_entry = NULL;
511 if (pstr->proc_root) {
512 snd_info_unregister(pstr->proc_root);
513 pstr->proc_root = NULL;
518 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
520 struct snd_info_entry *entry;
521 struct snd_card *card;
524 card = substream->pcm->card;
526 sprintf(name, "sub%i", substream->number);
527 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
529 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
530 if (snd_info_register(entry) < 0) {
531 snd_info_free_entry(entry);
534 substream->proc_root = entry;
536 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
537 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
538 if (snd_info_register(entry) < 0) {
539 snd_info_free_entry(entry);
543 substream->proc_info_entry = entry;
545 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
546 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
552 substream->proc_hw_params_entry = entry;
554 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
555 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
556 if (snd_info_register(entry) < 0) {
557 snd_info_free_entry(entry);
561 substream->proc_sw_params_entry = entry;
563 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
564 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
565 if (snd_info_register(entry) < 0) {
566 snd_info_free_entry(entry);
570 substream->proc_status_entry = entry;
575 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
577 if (substream->proc_info_entry) {
578 snd_info_unregister(substream->proc_info_entry);
579 substream->proc_info_entry = NULL;
581 if (substream->proc_hw_params_entry) {
582 snd_info_unregister(substream->proc_hw_params_entry);
583 substream->proc_hw_params_entry = NULL;
585 if (substream->proc_sw_params_entry) {
586 snd_info_unregister(substream->proc_sw_params_entry);
587 substream->proc_sw_params_entry = NULL;
589 if (substream->proc_status_entry) {
590 snd_info_unregister(substream->proc_status_entry);
591 substream->proc_status_entry = NULL;
593 if (substream->proc_root) {
594 snd_info_unregister(substream->proc_root);
595 substream->proc_root = NULL;
601 * snd_pcm_new_stream - create a new PCM stream
602 * @pcm: the pcm instance
603 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
604 * @substream_count: the number of substreams
606 * Creates a new stream for the pcm.
607 * The corresponding stream on the pcm must have been empty before
608 * calling this, i.e. zero must be given to the argument of
611 * Returns zero if successful, or a negative error code on failure.
613 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
616 struct snd_pcm_str *pstr = &pcm->streams[stream];
617 struct snd_pcm_substream *substream, *prev;
619 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
620 init_MUTEX(&pstr->oss.setup_mutex);
622 pstr->stream = stream;
624 pstr->substream_count = substream_count;
625 if (substream_count > 0) {
626 err = snd_pcm_stream_proc_init(pstr);
628 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
633 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
634 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
635 if (substream == NULL) {
636 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
639 substream->pcm = pcm;
640 substream->pstr = pstr;
641 substream->number = idx;
642 substream->stream = stream;
643 sprintf(substream->name, "subdevice #%i", idx);
644 substream->buffer_bytes_max = UINT_MAX;
646 pstr->substream = substream;
648 prev->next = substream;
649 err = snd_pcm_substream_proc_init(substream);
651 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
655 substream->group = &substream->self_group;
656 spin_lock_init(&substream->self_group.lock);
657 INIT_LIST_HEAD(&substream->self_group.substreams);
658 list_add_tail(&substream->link_list, &substream->self_group.substreams);
659 spin_lock_init(&substream->timer_lock);
666 * snd_pcm_new - create a new PCM instance
667 * @card: the card instance
669 * @device: the device index (zero based)
670 * @playback_count: the number of substreams for playback
671 * @capture_count: the number of substreams for capture
672 * @rpcm: the pointer to store the new pcm instance
674 * Creates a new PCM instance.
676 * The pcm operators have to be set afterwards to the new instance
677 * via snd_pcm_set_ops().
679 * Returns zero if successful, or a negative error code on failure.
681 int snd_pcm_new(struct snd_card *card, char *id, int device,
682 int playback_count, int capture_count,
683 struct snd_pcm ** rpcm)
687 static struct snd_device_ops ops = {
688 .dev_free = snd_pcm_dev_free,
689 .dev_register = snd_pcm_dev_register,
690 .dev_disconnect = snd_pcm_dev_disconnect,
691 .dev_unregister = snd_pcm_dev_unregister
694 snd_assert(rpcm != NULL, return -EINVAL);
696 snd_assert(card != NULL, return -ENXIO);
697 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
699 snd_printk(KERN_ERR "Cannot allocate PCM\n");
703 pcm->device = device;
705 strlcpy(pcm->id, id, sizeof(pcm->id));
706 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
710 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
714 init_MUTEX(&pcm->open_mutex);
715 init_waitqueue_head(&pcm->open_wait);
716 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
724 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
726 struct snd_pcm_substream *substream, *substream_next;
727 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
728 struct snd_pcm_oss_setup *setup, *setupn;
730 substream = pstr->substream;
732 substream_next = substream->next;
733 snd_pcm_substream_proc_done(substream);
735 substream = substream_next;
737 snd_pcm_stream_proc_done(pstr);
738 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
739 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
740 setupn = setup->next;
741 kfree(setup->task_name);
747 static int snd_pcm_free(struct snd_pcm *pcm)
749 snd_assert(pcm != NULL, return -ENXIO);
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 static void snd_pcm_tick_timer_func(unsigned long data)
767 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
768 snd_pcm_tick_elapsed(substream);
771 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
772 struct snd_pcm_substream **rsubstream)
774 struct snd_pcm_str * pstr;
775 struct snd_pcm_substream *substream;
776 struct snd_pcm_runtime *runtime;
777 struct snd_ctl_file *kctl;
778 struct snd_card *card;
779 struct list_head *list;
780 int prefer_subdevice = -1;
783 snd_assert(rsubstream != NULL, return -EINVAL);
785 snd_assert(pcm != NULL, return -ENXIO);
786 pstr = &pcm->streams[stream];
787 if (pstr->substream == NULL)
791 down_read(&card->controls_rwsem);
792 list_for_each(list, &card->ctl_files) {
793 kctl = snd_ctl_file(list);
794 if (kctl->pid == current->pid) {
795 prefer_subdevice = kctl->prefer_pcm_subdevice;
799 up_read(&card->controls_rwsem);
801 if (pstr->substream_count == 0)
804 case SNDRV_PCM_STREAM_PLAYBACK:
805 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
806 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
807 if (SUBSTREAM_BUSY(substream))
812 case SNDRV_PCM_STREAM_CAPTURE:
813 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
814 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
815 if (SUBSTREAM_BUSY(substream))
824 if (prefer_subdevice >= 0) {
825 for (substream = pstr->substream; substream; substream = substream->next)
826 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
829 for (substream = pstr->substream; substream; substream = substream->next)
830 if (!SUBSTREAM_BUSY(substream))
833 if (substream == NULL)
836 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
840 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
841 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
842 if (runtime->status == NULL) {
846 memset((void*)runtime->status, 0, size);
848 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
849 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
850 if (runtime->control == NULL) {
851 snd_free_pages((void*)runtime->status,
852 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
856 memset((void*)runtime->control, 0, size);
858 init_waitqueue_head(&runtime->sleep);
859 atomic_set(&runtime->mmap_count, 0);
860 init_timer(&runtime->tick_timer);
861 runtime->tick_timer.function = snd_pcm_tick_timer_func;
862 runtime->tick_timer.data = (unsigned long) substream;
864 runtime->status->state = SNDRV_PCM_STATE_OPEN;
866 substream->runtime = runtime;
867 substream->private_data = pcm->private_data;
868 pstr->substream_opened++;
869 *rsubstream = substream;
873 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
875 struct snd_pcm_runtime *runtime;
876 substream->file = NULL;
877 runtime = substream->runtime;
878 snd_assert(runtime != NULL, return);
879 if (runtime->private_free != NULL)
880 runtime->private_free(runtime);
881 snd_free_pages((void*)runtime->status,
882 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
883 snd_free_pages((void*)runtime->control,
884 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
885 kfree(runtime->hw_constraints.rules);
887 substream->runtime = NULL;
888 substream->pstr->substream_opened--;
891 static int snd_pcm_dev_register(struct snd_device *device)
894 struct snd_pcm_substream *substream;
895 struct list_head *list;
897 struct snd_pcm *pcm = device->device_data;
899 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
900 down(®ister_mutex);
901 if (snd_pcm_search(pcm->card, pcm->device)) {
905 list_add_tail(&pcm->list, &snd_pcm_devices);
906 for (cidx = 0; cidx < 2; cidx++) {
908 if (pcm->streams[cidx].substream == NULL)
911 case SNDRV_PCM_STREAM_PLAYBACK:
912 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
913 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
915 case SNDRV_PCM_STREAM_CAPTURE:
916 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
917 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
920 if ((err = snd_register_device(devtype, pcm->card,
922 &snd_pcm_f_ops[cidx],
925 list_del(&pcm->list);
929 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
930 snd_pcm_timer_init(substream);
932 list_for_each(list, &snd_pcm_notify_list) {
933 struct snd_pcm_notify *notify;
934 notify = list_entry(list, struct snd_pcm_notify, list);
935 notify->n_register(pcm);
941 static int snd_pcm_dev_disconnect(struct snd_device *device)
943 struct snd_pcm *pcm = device->device_data;
944 struct list_head *list;
945 struct snd_pcm_substream *substream;
948 down(®ister_mutex);
949 list_del_init(&pcm->list);
950 for (cidx = 0; cidx < 2; cidx++)
951 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
952 if (substream->runtime)
953 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
954 list_for_each(list, &snd_pcm_notify_list) {
955 struct snd_pcm_notify *notify;
956 notify = list_entry(list, struct snd_pcm_notify, list);
957 notify->n_disconnect(pcm);
963 static int snd_pcm_dev_unregister(struct snd_device *device)
966 struct snd_pcm_substream *substream;
967 struct list_head *list;
968 struct snd_pcm *pcm = device->device_data;
970 snd_assert(pcm != NULL, return -ENXIO);
971 down(®ister_mutex);
972 list_del(&pcm->list);
973 for (cidx = 0; cidx < 2; cidx++) {
976 case SNDRV_PCM_STREAM_PLAYBACK:
977 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
979 case SNDRV_PCM_STREAM_CAPTURE:
980 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
983 snd_unregister_device(devtype, pcm->card, pcm->device);
984 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
985 snd_pcm_timer_done(substream);
987 list_for_each(list, &snd_pcm_notify_list) {
988 struct snd_pcm_notify *notify;
989 notify = list_entry(list, struct snd_pcm_notify, list);
990 notify->n_unregister(pcm);
993 return snd_pcm_free(pcm);
996 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1000 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1001 down(®ister_mutex);
1003 list_del(¬ify->list);
1004 list_for_each(p, &snd_pcm_devices)
1005 notify->n_unregister(list_entry(p,
1006 struct snd_pcm, list));
1008 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1009 list_for_each(p, &snd_pcm_devices)
1010 notify->n_register(list_entry(p, struct snd_pcm, list));
1012 up(®ister_mutex);
1020 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1021 struct snd_info_buffer *buffer)
1023 struct list_head *p;
1024 struct snd_pcm *pcm;
1026 down(®ister_mutex);
1027 list_for_each(p, &snd_pcm_devices) {
1028 pcm = list_entry(p, struct snd_pcm, list);
1029 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1030 pcm->card->number, pcm->device, pcm->id, pcm->name);
1031 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1032 snd_iprintf(buffer, " : playback %i",
1033 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1034 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1035 snd_iprintf(buffer, " : capture %i",
1036 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1037 snd_iprintf(buffer, "\n");
1039 up(®ister_mutex);
1046 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1048 static int __init alsa_pcm_init(void)
1050 struct snd_info_entry *entry;
1052 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1053 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1054 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1055 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1057 if (snd_info_register(entry) < 0) {
1058 snd_info_free_entry(entry);
1062 snd_pcm_proc_entry = entry;
1066 static void __exit alsa_pcm_exit(void)
1068 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1069 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1070 if (snd_pcm_proc_entry) {
1071 snd_info_unregister(snd_pcm_proc_entry);
1072 snd_pcm_proc_entry = NULL;
1076 module_init(alsa_pcm_init)
1077 module_exit(alsa_pcm_exit)
1079 EXPORT_SYMBOL(snd_pcm_new);
1080 EXPORT_SYMBOL(snd_pcm_new_stream);
1081 EXPORT_SYMBOL(snd_pcm_notify);
1082 EXPORT_SYMBOL(snd_pcm_open_substream);
1083 EXPORT_SYMBOL(snd_pcm_release_substream);
1084 EXPORT_SYMBOL(snd_pcm_format_name);
1086 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1088 EXPORT_SYMBOL(snd_pcm_suspend);
1089 EXPORT_SYMBOL(snd_pcm_suspend_all);
1091 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1092 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1093 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1094 EXPORT_SYMBOL(snd_pcm_mmap_data);
1095 #if SNDRV_PCM_INFO_MMAP_IOMEM
1096 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1099 EXPORT_SYMBOL(snd_pcm_format_signed);
1100 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1101 EXPORT_SYMBOL(snd_pcm_format_linear);
1102 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1103 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1104 EXPORT_SYMBOL(snd_pcm_format_width);
1105 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1106 EXPORT_SYMBOL(snd_pcm_format_size);
1107 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1108 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1109 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1110 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);