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 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DECLARE_MUTEX(register_mutex);
40 static int snd_pcm_free(snd_pcm_t *pcm);
41 static int snd_pcm_dev_free(snd_device_t *device);
42 static int snd_pcm_dev_register(snd_device_t *device);
43 static int snd_pcm_dev_disconnect(snd_device_t *device);
44 static int snd_pcm_dev_unregister(snd_device_t *device);
46 static int snd_pcm_control_ioctl(snd_card_t * card,
47 snd_ctl_file_t * control,
48 unsigned int cmd, unsigned long arg)
52 tmp = card->number * SNDRV_PCM_DEVICES;
54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
58 if (get_user(device, (int __user *)arg))
60 device = device < 0 ? 0 : device + 1;
61 while (device < SNDRV_PCM_DEVICES) {
62 if (snd_pcm_devices[tmp + device])
66 if (device == SNDRV_PCM_DEVICES)
68 if (put_user(device, (int __user *)arg))
72 case SNDRV_CTL_IOCTL_PCM_INFO:
74 snd_pcm_info_t __user *info;
75 unsigned int device, subdevice;
76 snd_pcm_stream_t stream;
79 snd_pcm_substream_t *substream;
80 info = (snd_pcm_info_t __user *)arg;
81 if (get_user(device, &info->device))
83 if (device >= SNDRV_PCM_DEVICES)
85 pcm = snd_pcm_devices[tmp + device];
88 if (get_user(stream, &info->stream))
90 if (stream < 0 || stream > 1)
92 pstr = &pcm->streams[stream];
93 if (pstr->substream_count == 0)
95 if (get_user(subdevice, &info->subdevice))
97 if (subdevice >= pstr->substream_count)
99 for (substream = pstr->substream; substream; substream = substream->next)
100 if (substream->number == (int)subdevice)
102 if (substream == NULL)
104 return snd_pcm_info_user(substream, info);
106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
110 if (get_user(val, (int __user *)arg))
112 control->prefer_pcm_subdevice = val;
118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
125 #define START(v) [SNDRV_PCM_START_##v] = #v
126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
129 static char *snd_pcm_stream_names[] = {
134 static char *snd_pcm_state_names[] = {
145 static char *snd_pcm_access_names[] = {
146 ACCESS(MMAP_INTERLEAVED),
147 ACCESS(MMAP_NONINTERLEAVED),
148 ACCESS(MMAP_COMPLEX),
149 ACCESS(RW_INTERLEAVED),
150 ACCESS(RW_NONINTERLEAVED),
153 static char *snd_pcm_format_names[] = {
172 FORMAT(IEC958_SUBFRAME_LE),
173 FORMAT(IEC958_SUBFRAME_BE),
194 static char *snd_pcm_subformat_names[] = {
198 static char *snd_pcm_tstamp_mode_names[] = {
203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
206 return snd_pcm_stream_names[stream];
209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
211 snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
212 return snd_pcm_access_names[access];
215 const char *snd_pcm_format_name(snd_pcm_format_t format)
217 snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
218 return snd_pcm_format_names[format];
221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
223 snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
224 return snd_pcm_subformat_names[subformat];
227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
229 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
230 return snd_pcm_tstamp_mode_names[mode];
233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
235 snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
236 return snd_pcm_state_names[state];
239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
240 #include <linux/soundcard.h>
241 static const char *snd_pcm_oss_format_name(int format)
270 #ifdef CONFIG_PROC_FS
271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
273 snd_pcm_info_t *info;
276 snd_runtime_check(substream, return);
278 info = kmalloc(sizeof(*info), GFP_KERNEL);
280 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
284 err = snd_pcm_info(substream, info);
286 snd_iprintf(buffer, "error %d\n", err);
290 snd_iprintf(buffer, "card: %d\n", info->card);
291 snd_iprintf(buffer, "device: %d\n", info->device);
292 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
293 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
294 snd_iprintf(buffer, "id: %s\n", info->id);
295 snd_iprintf(buffer, "name: %s\n", info->name);
296 snd_iprintf(buffer, "subname: %s\n", info->subname);
297 snd_iprintf(buffer, "class: %d\n", info->dev_class);
298 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
299 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
300 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
306 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
311 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
316 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
317 snd_pcm_runtime_t *runtime = substream->runtime;
319 snd_iprintf(buffer, "closed\n");
322 snd_pcm_stream_lock_irq(substream);
323 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
324 snd_iprintf(buffer, "no setup\n");
325 snd_pcm_stream_unlock_irq(substream);
328 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
329 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
330 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
331 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
332 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
333 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
334 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
335 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
337 if (substream->oss.oss) {
338 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
339 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
340 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
341 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
342 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
343 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
346 snd_pcm_stream_unlock_irq(substream);
349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
351 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
352 snd_pcm_runtime_t *runtime = substream->runtime;
354 snd_iprintf(buffer, "closed\n");
357 snd_pcm_stream_lock_irq(substream);
358 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
359 snd_iprintf(buffer, "no setup\n");
360 snd_pcm_stream_unlock_irq(substream);
363 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
364 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
365 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
366 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
367 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
368 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
369 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
370 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
371 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
372 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
373 snd_pcm_stream_unlock_irq(substream);
376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
378 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
379 snd_pcm_runtime_t *runtime = substream->runtime;
380 snd_pcm_status_t status;
383 snd_iprintf(buffer, "closed\n");
386 memset(&status, 0, sizeof(status));
387 err = snd_pcm_status(substream, &status);
389 snd_iprintf(buffer, "error %d\n", err);
392 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
393 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
394 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
395 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
396 status.tstamp.tv_sec, status.tstamp.tv_nsec);
397 snd_iprintf(buffer, "delay : %ld\n", status.delay);
398 snd_iprintf(buffer, "avail : %ld\n", status.avail);
399 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
400 snd_iprintf(buffer, "-----\n");
401 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
402 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
406 #ifdef CONFIG_SND_DEBUG
407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
409 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
410 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
415 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
417 if (!snd_info_get_line(buffer, line, sizeof(line)))
418 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
424 snd_pcm_t *pcm = pstr->pcm;
425 snd_info_entry_t *entry;
428 sprintf(name, "pcm%i%c", pcm->device,
429 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
430 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
432 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
433 if (snd_info_register(entry) < 0) {
434 snd_info_free_entry(entry);
437 pstr->proc_root = entry;
439 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
440 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
441 if (snd_info_register(entry) < 0) {
442 snd_info_free_entry(entry);
446 pstr->proc_info_entry = entry;
448 #ifdef CONFIG_SND_DEBUG
449 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
450 entry->c.text.read_size = 64;
451 entry->c.text.read = snd_pcm_xrun_debug_read;
452 entry->c.text.write_size = 64;
453 entry->c.text.write = snd_pcm_xrun_debug_write;
454 entry->private_data = pstr;
455 if (snd_info_register(entry) < 0) {
456 snd_info_free_entry(entry);
460 pstr->proc_xrun_debug_entry = entry;
465 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
467 #ifdef CONFIG_SND_DEBUG
468 if (pstr->proc_xrun_debug_entry) {
469 snd_info_unregister(pstr->proc_xrun_debug_entry);
470 pstr->proc_xrun_debug_entry = NULL;
473 if (pstr->proc_info_entry) {
474 snd_info_unregister(pstr->proc_info_entry);
475 pstr->proc_info_entry = NULL;
477 if (pstr->proc_root) {
478 snd_info_unregister(pstr->proc_root);
479 pstr->proc_root = NULL;
484 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
486 snd_info_entry_t *entry;
490 card = substream->pcm->card;
492 sprintf(name, "sub%i", substream->number);
493 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
495 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
496 if (snd_info_register(entry) < 0) {
497 snd_info_free_entry(entry);
500 substream->proc_root = entry;
502 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
503 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
504 if (snd_info_register(entry) < 0) {
505 snd_info_free_entry(entry);
509 substream->proc_info_entry = entry;
511 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
512 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
513 if (snd_info_register(entry) < 0) {
514 snd_info_free_entry(entry);
518 substream->proc_hw_params_entry = entry;
520 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
521 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
527 substream->proc_sw_params_entry = entry;
529 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
530 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
531 if (snd_info_register(entry) < 0) {
532 snd_info_free_entry(entry);
536 substream->proc_status_entry = entry;
541 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
543 if (substream->proc_info_entry) {
544 snd_info_unregister(substream->proc_info_entry);
545 substream->proc_info_entry = NULL;
547 if (substream->proc_hw_params_entry) {
548 snd_info_unregister(substream->proc_hw_params_entry);
549 substream->proc_hw_params_entry = NULL;
551 if (substream->proc_sw_params_entry) {
552 snd_info_unregister(substream->proc_sw_params_entry);
553 substream->proc_sw_params_entry = NULL;
555 if (substream->proc_status_entry) {
556 snd_info_unregister(substream->proc_status_entry);
557 substream->proc_status_entry = NULL;
559 if (substream->proc_root) {
560 snd_info_unregister(substream->proc_root);
561 substream->proc_root = NULL;
567 * snd_pcm_new_stream - create a new PCM stream
568 * @pcm: the pcm instance
569 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
570 * @substream_count: the number of substreams
572 * Creates a new stream for the pcm.
573 * The corresponding stream on the pcm must have been empty before
574 * calling this, i.e. zero must be given to the argument of
577 * Returns zero if successful, or a negative error code on failure.
579 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
582 snd_pcm_str_t *pstr = &pcm->streams[stream];
583 snd_pcm_substream_t *substream, *prev;
585 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
586 init_MUTEX(&pstr->oss.setup_mutex);
588 pstr->stream = stream;
590 pstr->substream_count = substream_count;
591 pstr->reg = &snd_pcm_reg[stream];
592 if (substream_count > 0) {
593 err = snd_pcm_stream_proc_init(pstr);
598 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
599 substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
600 if (substream == NULL)
602 substream->pcm = pcm;
603 substream->pstr = pstr;
604 substream->number = idx;
605 substream->stream = stream;
606 sprintf(substream->name, "subdevice #%i", idx);
607 substream->buffer_bytes_max = UINT_MAX;
609 pstr->substream = substream;
611 prev->next = substream;
612 err = snd_pcm_substream_proc_init(substream);
617 substream->group = &substream->self_group;
618 spin_lock_init(&substream->self_group.lock);
619 INIT_LIST_HEAD(&substream->self_group.substreams);
620 list_add_tail(&substream->link_list, &substream->self_group.substreams);
621 spin_lock_init(&substream->timer_lock);
628 * snd_pcm_new - create a new PCM instance
629 * @card: the card instance
631 * @device: the device index (zero based)
632 * @playback_count: the number of substreams for playback
633 * @capture_count: the number of substreams for capture
634 * @rpcm: the pointer to store the new pcm instance
636 * Creates a new PCM instance.
638 * The pcm operators have to be set afterwards to the new instance
639 * via snd_pcm_set_ops().
641 * Returns zero if successful, or a negative error code on failure.
643 int snd_pcm_new(snd_card_t * card, char *id, int device,
644 int playback_count, int capture_count,
649 static snd_device_ops_t ops = {
650 .dev_free = snd_pcm_dev_free,
651 .dev_register = snd_pcm_dev_register,
652 .dev_disconnect = snd_pcm_dev_disconnect,
653 .dev_unregister = snd_pcm_dev_unregister
656 snd_assert(rpcm != NULL, return -EINVAL);
658 snd_assert(card != NULL, return -ENXIO);
659 pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
663 pcm->device = device;
665 strlcpy(pcm->id, id, sizeof(pcm->id));
667 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
671 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
675 init_MUTEX(&pcm->open_mutex);
676 init_waitqueue_head(&pcm->open_wait);
677 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
685 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
687 snd_pcm_substream_t *substream, *substream_next;
688 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
689 snd_pcm_oss_setup_t *setup, *setupn;
691 substream = pstr->substream;
693 substream_next = substream->next;
694 snd_pcm_substream_proc_done(substream);
696 substream = substream_next;
698 snd_pcm_stream_proc_done(pstr);
699 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
700 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
701 setupn = setup->next;
702 kfree(setup->task_name);
708 static int snd_pcm_free(snd_pcm_t *pcm)
710 snd_assert(pcm != NULL, return -ENXIO);
711 if (pcm->private_free)
712 pcm->private_free(pcm);
713 snd_pcm_lib_preallocate_free_for_all(pcm);
714 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
715 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
720 static int snd_pcm_dev_free(snd_device_t *device)
722 snd_pcm_t *pcm = device->device_data;
723 return snd_pcm_free(pcm);
726 static void snd_pcm_tick_timer_func(unsigned long data)
728 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
729 snd_pcm_tick_elapsed(substream);
732 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
733 snd_pcm_substream_t **rsubstream)
735 snd_pcm_str_t * pstr;
736 snd_pcm_substream_t * substream;
737 snd_pcm_runtime_t * runtime;
738 snd_ctl_file_t *kctl;
740 struct list_head *list;
741 int prefer_subdevice = -1;
744 snd_assert(rsubstream != NULL, return -EINVAL);
746 snd_assert(pcm != NULL, return -ENXIO);
747 pstr = &pcm->streams[stream];
748 if (pstr->substream == NULL)
752 down_read(&card->controls_rwsem);
753 list_for_each(list, &card->ctl_files) {
754 kctl = snd_ctl_file(list);
755 if (kctl->pid == current->pid) {
756 prefer_subdevice = kctl->prefer_pcm_subdevice;
760 up_read(&card->controls_rwsem);
762 if (pstr->substream_count == 0)
765 case SNDRV_PCM_STREAM_PLAYBACK:
766 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
767 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
768 if (SUBSTREAM_BUSY(substream))
773 case SNDRV_PCM_STREAM_CAPTURE:
774 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
775 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
776 if (SUBSTREAM_BUSY(substream))
785 if (prefer_subdevice >= 0) {
786 for (substream = pstr->substream; substream; substream = substream->next)
787 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
790 for (substream = pstr->substream; substream; substream = substream->next)
791 if (!SUBSTREAM_BUSY(substream))
794 if (substream == NULL)
797 runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
801 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
802 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
803 if (runtime->status == NULL) {
807 memset((void*)runtime->status, 0, size);
809 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
810 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
811 if (runtime->control == NULL) {
812 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
816 memset((void*)runtime->control, 0, size);
818 init_waitqueue_head(&runtime->sleep);
819 atomic_set(&runtime->mmap_count, 0);
820 init_timer(&runtime->tick_timer);
821 runtime->tick_timer.function = snd_pcm_tick_timer_func;
822 runtime->tick_timer.data = (unsigned long) substream;
824 runtime->status->state = SNDRV_PCM_STATE_OPEN;
826 substream->runtime = runtime;
827 substream->private_data = pcm->private_data;
828 pstr->substream_opened++;
829 *rsubstream = substream;
833 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
835 snd_pcm_runtime_t * runtime;
836 substream->file = NULL;
837 runtime = substream->runtime;
838 snd_assert(runtime != NULL, return);
839 if (runtime->private_free != NULL)
840 runtime->private_free(runtime);
841 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
842 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
843 kfree(runtime->hw_constraints.rules);
845 substream->runtime = NULL;
846 substream->pstr->substream_opened--;
849 static int snd_pcm_dev_register(snd_device_t *device)
852 unsigned short minor;
853 snd_pcm_substream_t *substream;
854 struct list_head *list;
856 snd_pcm_t *pcm = device->device_data;
858 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
859 down(®ister_mutex);
860 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
861 if (snd_pcm_devices[idx]) {
865 snd_pcm_devices[idx] = pcm;
866 for (cidx = 0; cidx < 2; cidx++) {
868 if (pcm->streams[cidx].substream == NULL)
871 case SNDRV_PCM_STREAM_PLAYBACK:
872 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
873 minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
874 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
876 case SNDRV_PCM_STREAM_CAPTURE:
877 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
878 minor = SNDRV_MINOR_PCM_CAPTURE + idx;
879 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
882 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
883 snd_pcm_devices[idx] = NULL;
887 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
888 snd_pcm_timer_init(substream);
890 list_for_each(list, &snd_pcm_notify_list) {
891 snd_pcm_notify_t *notify;
892 notify = list_entry(list, snd_pcm_notify_t, list);
893 notify->n_register(pcm);
899 static int snd_pcm_dev_disconnect(snd_device_t *device)
901 snd_pcm_t *pcm = device->device_data;
902 struct list_head *list;
903 snd_pcm_substream_t *substream;
906 down(®ister_mutex);
907 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
908 snd_pcm_devices[idx] = NULL;
909 for (cidx = 0; cidx < 2; cidx++)
910 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
911 if (substream->runtime)
912 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
913 list_for_each(list, &snd_pcm_notify_list) {
914 snd_pcm_notify_t *notify;
915 notify = list_entry(list, snd_pcm_notify_t, list);
916 notify->n_disconnect(pcm);
922 static int snd_pcm_dev_unregister(snd_device_t *device)
924 int idx, cidx, devtype;
925 snd_pcm_substream_t *substream;
926 struct list_head *list;
927 snd_pcm_t *pcm = device->device_data;
929 snd_assert(pcm != NULL, return -ENXIO);
930 down(®ister_mutex);
931 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
932 snd_pcm_devices[idx] = NULL;
933 for (cidx = 0; cidx < 2; cidx++) {
936 case SNDRV_PCM_STREAM_PLAYBACK:
937 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
939 case SNDRV_PCM_STREAM_CAPTURE:
940 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
943 snd_unregister_device(devtype, pcm->card, pcm->device);
944 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
945 snd_pcm_timer_done(substream);
947 list_for_each(list, &snd_pcm_notify_list) {
948 snd_pcm_notify_t *notify;
949 notify = list_entry(list, snd_pcm_notify_t, list);
950 notify->n_unregister(pcm);
953 return snd_pcm_free(pcm);
956 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
960 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
961 down(®ister_mutex);
963 list_del(¬ify->list);
964 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
965 if (snd_pcm_devices[idx] == NULL)
967 notify->n_unregister(snd_pcm_devices[idx]);
970 list_add_tail(¬ify->list, &snd_pcm_notify_list);
971 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
972 if (snd_pcm_devices[idx] == NULL)
974 notify->n_register(snd_pcm_devices[idx]);
985 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
990 down(®ister_mutex);
991 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
992 pcm = snd_pcm_devices[idx];
995 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
996 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
997 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
998 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
999 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1000 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1001 snd_iprintf(buffer, "\n");
1003 up(®ister_mutex);
1010 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1012 static int __init alsa_pcm_init(void)
1014 snd_info_entry_t *entry;
1016 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1017 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1018 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1019 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1020 if (snd_info_register(entry) < 0) {
1021 snd_info_free_entry(entry);
1025 snd_pcm_proc_entry = entry;
1029 static void __exit alsa_pcm_exit(void)
1031 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1032 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1033 if (snd_pcm_proc_entry) {
1034 snd_info_unregister(snd_pcm_proc_entry);
1035 snd_pcm_proc_entry = NULL;
1039 module_init(alsa_pcm_init)
1040 module_exit(alsa_pcm_exit)
1042 EXPORT_SYMBOL(snd_pcm_devices);
1043 EXPORT_SYMBOL(snd_pcm_new);
1044 EXPORT_SYMBOL(snd_pcm_new_stream);
1045 EXPORT_SYMBOL(snd_pcm_notify);
1046 EXPORT_SYMBOL(snd_pcm_open_substream);
1047 EXPORT_SYMBOL(snd_pcm_release_substream);
1048 EXPORT_SYMBOL(snd_pcm_format_name);
1050 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1051 EXPORT_SYMBOL(snd_pcm_start);
1053 EXPORT_SYMBOL(snd_pcm_suspend);
1054 EXPORT_SYMBOL(snd_pcm_suspend_all);
1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_mmap_data);
1060 #if SNDRV_PCM_INFO_MMAP_IOMEM
1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1064 EXPORT_SYMBOL(snd_pcm_format_signed);
1065 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1066 EXPORT_SYMBOL(snd_pcm_format_linear);
1067 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1068 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_width);
1070 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1071 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1072 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1073 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1074 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);