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 <linux/device.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/pcm.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
34 #include "pcm_local.h"
36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
37 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
38 MODULE_LICENSE("GPL");
40 static LIST_HEAD(snd_pcm_devices
);
41 static DEFINE_MUTEX(register_mutex
);
42 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
43 static LIST_HEAD(snd_pcm_notify_list
);
46 static int snd_pcm_free(struct snd_pcm
*pcm
);
47 static int snd_pcm_dev_free(struct snd_device
*device
);
48 static int snd_pcm_dev_register(struct snd_device
*device
);
49 static int snd_pcm_dev_disconnect(struct snd_device
*device
);
51 static struct snd_pcm
*snd_pcm_get(struct snd_card
*card
, int device
)
55 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
56 if (pcm
->card
== card
&& pcm
->device
== device
)
62 static int snd_pcm_next(struct snd_card
*card
, int device
)
66 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
67 if (pcm
->card
== card
&& pcm
->device
> device
)
69 else if (pcm
->card
->number
> card
->number
)
75 static int snd_pcm_add(struct snd_pcm
*newpcm
)
82 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
83 if (pcm
->card
== newpcm
->card
&& pcm
->device
== newpcm
->device
)
85 if (pcm
->card
->number
> newpcm
->card
->number
||
86 (pcm
->card
== newpcm
->card
&&
87 pcm
->device
> newpcm
->device
)) {
88 list_add(&newpcm
->list
, pcm
->list
.prev
);
92 list_add_tail(&newpcm
->list
, &snd_pcm_devices
);
96 static int snd_pcm_control_ioctl(struct snd_card
*card
,
97 struct snd_ctl_file
*control
,
98 unsigned int cmd
, unsigned long arg
)
101 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE
:
105 if (get_user(device
, (int __user
*)arg
))
107 mutex_lock(®ister_mutex
);
108 device
= snd_pcm_next(card
, device
);
109 mutex_unlock(®ister_mutex
);
110 if (put_user(device
, (int __user
*)arg
))
114 case SNDRV_CTL_IOCTL_PCM_INFO
:
116 struct snd_pcm_info __user
*info
;
117 unsigned int device
, subdevice
;
120 struct snd_pcm_str
*pstr
;
121 struct snd_pcm_substream
*substream
;
124 info
= (struct snd_pcm_info __user
*)arg
;
125 if (get_user(device
, &info
->device
))
127 if (get_user(stream
, &info
->stream
))
129 if (stream
< 0 || stream
> 1)
131 if (get_user(subdevice
, &info
->subdevice
))
133 mutex_lock(®ister_mutex
);
134 pcm
= snd_pcm_get(card
, device
);
139 pstr
= &pcm
->streams
[stream
];
140 if (pstr
->substream_count
== 0) {
144 if (subdevice
>= pstr
->substream_count
) {
148 for (substream
= pstr
->substream
; substream
;
149 substream
= substream
->next
)
150 if (substream
->number
== (int)subdevice
)
152 if (substream
== NULL
) {
156 err
= snd_pcm_info_user(substream
, info
);
158 mutex_unlock(®ister_mutex
);
161 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE
:
165 if (get_user(val
, (int __user
*)arg
))
167 control
->preferred_subdevice
[SND_CTL_SUBDEV_PCM
] = val
;
174 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
176 static char *snd_pcm_format_names
[] = {
195 FORMAT(IEC958_SUBFRAME_LE
),
196 FORMAT(IEC958_SUBFRAME_BE
),
227 * snd_pcm_format_name - Return a name string for the given PCM format
228 * @format: PCM format
230 const char *snd_pcm_format_name(snd_pcm_format_t format
)
232 if ((__force
unsigned int)format
>= ARRAY_SIZE(snd_pcm_format_names
))
234 return snd_pcm_format_names
[(__force
unsigned int)format
];
236 EXPORT_SYMBOL_GPL(snd_pcm_format_name
);
238 #ifdef CONFIG_SND_VERBOSE_PROCFS
240 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
241 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
242 #define READY(v) [SNDRV_PCM_READY_##v] = #v
243 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
244 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
245 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
246 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
247 #define START(v) [SNDRV_PCM_START_##v] = #v
248 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
250 static char *snd_pcm_stream_names
[] = {
255 static char *snd_pcm_state_names
[] = {
266 static char *snd_pcm_access_names
[] = {
267 ACCESS(MMAP_INTERLEAVED
),
268 ACCESS(MMAP_NONINTERLEAVED
),
269 ACCESS(MMAP_COMPLEX
),
270 ACCESS(RW_INTERLEAVED
),
271 ACCESS(RW_NONINTERLEAVED
),
274 static char *snd_pcm_subformat_names
[] = {
278 static char *snd_pcm_tstamp_mode_names
[] = {
283 static const char *snd_pcm_stream_name(int stream
)
285 return snd_pcm_stream_names
[stream
];
288 static const char *snd_pcm_access_name(snd_pcm_access_t access
)
290 return snd_pcm_access_names
[(__force
int)access
];
293 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat
)
295 return snd_pcm_subformat_names
[(__force
int)subformat
];
298 static const char *snd_pcm_tstamp_mode_name(int mode
)
300 return snd_pcm_tstamp_mode_names
[mode
];
303 static const char *snd_pcm_state_name(snd_pcm_state_t state
)
305 return snd_pcm_state_names
[(__force
int)state
];
308 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
309 #include <linux/soundcard.h>
311 static const char *snd_pcm_oss_format_name(int format
)
340 static void snd_pcm_proc_info_read(struct snd_pcm_substream
*substream
,
341 struct snd_info_buffer
*buffer
)
343 struct snd_pcm_info
*info
;
349 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
353 err
= snd_pcm_info(substream
, info
);
355 snd_iprintf(buffer
, "error %d\n", err
);
359 snd_iprintf(buffer
, "card: %d\n", info
->card
);
360 snd_iprintf(buffer
, "device: %d\n", info
->device
);
361 snd_iprintf(buffer
, "subdevice: %d\n", info
->subdevice
);
362 snd_iprintf(buffer
, "stream: %s\n", snd_pcm_stream_name(info
->stream
));
363 snd_iprintf(buffer
, "id: %s\n", info
->id
);
364 snd_iprintf(buffer
, "name: %s\n", info
->name
);
365 snd_iprintf(buffer
, "subname: %s\n", info
->subname
);
366 snd_iprintf(buffer
, "class: %d\n", info
->dev_class
);
367 snd_iprintf(buffer
, "subclass: %d\n", info
->dev_subclass
);
368 snd_iprintf(buffer
, "subdevices_count: %d\n", info
->subdevices_count
);
369 snd_iprintf(buffer
, "subdevices_avail: %d\n", info
->subdevices_avail
);
373 static void snd_pcm_stream_proc_info_read(struct snd_info_entry
*entry
,
374 struct snd_info_buffer
*buffer
)
376 snd_pcm_proc_info_read(((struct snd_pcm_str
*)entry
->private_data
)->substream
,
380 static void snd_pcm_substream_proc_info_read(struct snd_info_entry
*entry
,
381 struct snd_info_buffer
*buffer
)
383 snd_pcm_proc_info_read(entry
->private_data
, buffer
);
386 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry
*entry
,
387 struct snd_info_buffer
*buffer
)
389 struct snd_pcm_substream
*substream
= entry
->private_data
;
390 struct snd_pcm_runtime
*runtime
;
392 mutex_lock(&substream
->pcm
->open_mutex
);
393 runtime
= substream
->runtime
;
395 snd_iprintf(buffer
, "closed\n");
398 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
) {
399 snd_iprintf(buffer
, "no setup\n");
402 snd_iprintf(buffer
, "access: %s\n", snd_pcm_access_name(runtime
->access
));
403 snd_iprintf(buffer
, "format: %s\n", snd_pcm_format_name(runtime
->format
));
404 snd_iprintf(buffer
, "subformat: %s\n", snd_pcm_subformat_name(runtime
->subformat
));
405 snd_iprintf(buffer
, "channels: %u\n", runtime
->channels
);
406 snd_iprintf(buffer
, "rate: %u (%u/%u)\n", runtime
->rate
, runtime
->rate_num
, runtime
->rate_den
);
407 snd_iprintf(buffer
, "period_size: %lu\n", runtime
->period_size
);
408 snd_iprintf(buffer
, "buffer_size: %lu\n", runtime
->buffer_size
);
409 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
410 if (substream
->oss
.oss
) {
411 snd_iprintf(buffer
, "OSS format: %s\n", snd_pcm_oss_format_name(runtime
->oss
.format
));
412 snd_iprintf(buffer
, "OSS channels: %u\n", runtime
->oss
.channels
);
413 snd_iprintf(buffer
, "OSS rate: %u\n", runtime
->oss
.rate
);
414 snd_iprintf(buffer
, "OSS period bytes: %lu\n", (unsigned long)runtime
->oss
.period_bytes
);
415 snd_iprintf(buffer
, "OSS periods: %u\n", runtime
->oss
.periods
);
416 snd_iprintf(buffer
, "OSS period frames: %lu\n", (unsigned long)runtime
->oss
.period_frames
);
420 mutex_unlock(&substream
->pcm
->open_mutex
);
423 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry
*entry
,
424 struct snd_info_buffer
*buffer
)
426 struct snd_pcm_substream
*substream
= entry
->private_data
;
427 struct snd_pcm_runtime
*runtime
;
429 mutex_lock(&substream
->pcm
->open_mutex
);
430 runtime
= substream
->runtime
;
432 snd_iprintf(buffer
, "closed\n");
435 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
) {
436 snd_iprintf(buffer
, "no setup\n");
439 snd_iprintf(buffer
, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime
->tstamp_mode
));
440 snd_iprintf(buffer
, "period_step: %u\n", runtime
->period_step
);
441 snd_iprintf(buffer
, "avail_min: %lu\n", runtime
->control
->avail_min
);
442 snd_iprintf(buffer
, "start_threshold: %lu\n", runtime
->start_threshold
);
443 snd_iprintf(buffer
, "stop_threshold: %lu\n", runtime
->stop_threshold
);
444 snd_iprintf(buffer
, "silence_threshold: %lu\n", runtime
->silence_threshold
);
445 snd_iprintf(buffer
, "silence_size: %lu\n", runtime
->silence_size
);
446 snd_iprintf(buffer
, "boundary: %lu\n", runtime
->boundary
);
448 mutex_unlock(&substream
->pcm
->open_mutex
);
451 static void snd_pcm_substream_proc_status_read(struct snd_info_entry
*entry
,
452 struct snd_info_buffer
*buffer
)
454 struct snd_pcm_substream
*substream
= entry
->private_data
;
455 struct snd_pcm_runtime
*runtime
;
456 struct snd_pcm_status status
;
459 mutex_lock(&substream
->pcm
->open_mutex
);
460 runtime
= substream
->runtime
;
462 snd_iprintf(buffer
, "closed\n");
465 memset(&status
, 0, sizeof(status
));
466 err
= snd_pcm_status(substream
, &status
);
468 snd_iprintf(buffer
, "error %d\n", err
);
471 snd_iprintf(buffer
, "state: %s\n", snd_pcm_state_name(status
.state
));
472 snd_iprintf(buffer
, "owner_pid : %d\n", pid_vnr(substream
->pid
));
473 snd_iprintf(buffer
, "trigger_time: %ld.%09ld\n",
474 status
.trigger_tstamp
.tv_sec
, status
.trigger_tstamp
.tv_nsec
);
475 snd_iprintf(buffer
, "tstamp : %ld.%09ld\n",
476 status
.tstamp
.tv_sec
, status
.tstamp
.tv_nsec
);
477 snd_iprintf(buffer
, "delay : %ld\n", status
.delay
);
478 snd_iprintf(buffer
, "avail : %ld\n", status
.avail
);
479 snd_iprintf(buffer
, "avail_max : %ld\n", status
.avail_max
);
480 snd_iprintf(buffer
, "-----\n");
481 snd_iprintf(buffer
, "hw_ptr : %ld\n", runtime
->status
->hw_ptr
);
482 snd_iprintf(buffer
, "appl_ptr : %ld\n", runtime
->control
->appl_ptr
);
484 mutex_unlock(&substream
->pcm
->open_mutex
);
487 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
488 static void snd_pcm_xrun_injection_write(struct snd_info_entry
*entry
,
489 struct snd_info_buffer
*buffer
)
491 struct snd_pcm_substream
*substream
= entry
->private_data
;
492 struct snd_pcm_runtime
*runtime
;
494 snd_pcm_stream_lock_irq(substream
);
495 runtime
= substream
->runtime
;
496 if (runtime
&& runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
497 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
498 snd_pcm_stream_unlock_irq(substream
);
501 static void snd_pcm_xrun_debug_read(struct snd_info_entry
*entry
,
502 struct snd_info_buffer
*buffer
)
504 struct snd_pcm_str
*pstr
= entry
->private_data
;
505 snd_iprintf(buffer
, "%d\n", pstr
->xrun_debug
);
508 static void snd_pcm_xrun_debug_write(struct snd_info_entry
*entry
,
509 struct snd_info_buffer
*buffer
)
511 struct snd_pcm_str
*pstr
= entry
->private_data
;
513 if (!snd_info_get_line(buffer
, line
, sizeof(line
)))
514 pstr
->xrun_debug
= simple_strtoul(line
, NULL
, 10);
518 static int snd_pcm_stream_proc_init(struct snd_pcm_str
*pstr
)
520 struct snd_pcm
*pcm
= pstr
->pcm
;
521 struct snd_info_entry
*entry
;
524 sprintf(name
, "pcm%i%c", pcm
->device
,
525 pstr
->stream
== SNDRV_PCM_STREAM_PLAYBACK
? 'p' : 'c');
526 entry
= snd_info_create_card_entry(pcm
->card
, name
,
527 pcm
->card
->proc_root
);
530 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
531 if (snd_info_register(entry
) < 0) {
532 snd_info_free_entry(entry
);
535 pstr
->proc_root
= entry
;
536 entry
= snd_info_create_card_entry(pcm
->card
, "info", pstr
->proc_root
);
538 snd_info_set_text_ops(entry
, pstr
, snd_pcm_stream_proc_info_read
);
539 if (snd_info_register(entry
) < 0) {
540 snd_info_free_entry(entry
);
544 pstr
->proc_info_entry
= entry
;
546 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
547 entry
= snd_info_create_card_entry(pcm
->card
, "xrun_debug",
550 entry
->c
.text
.read
= snd_pcm_xrun_debug_read
;
551 entry
->c
.text
.write
= snd_pcm_xrun_debug_write
;
552 entry
->mode
|= S_IWUSR
;
553 entry
->private_data
= pstr
;
554 if (snd_info_register(entry
) < 0) {
555 snd_info_free_entry(entry
);
559 pstr
->proc_xrun_debug_entry
= entry
;
564 static int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
)
566 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
567 snd_info_free_entry(pstr
->proc_xrun_debug_entry
);
568 pstr
->proc_xrun_debug_entry
= NULL
;
570 snd_info_free_entry(pstr
->proc_info_entry
);
571 pstr
->proc_info_entry
= NULL
;
572 snd_info_free_entry(pstr
->proc_root
);
573 pstr
->proc_root
= NULL
;
577 static int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
)
579 struct snd_info_entry
*entry
;
580 struct snd_card
*card
;
583 card
= substream
->pcm
->card
;
585 sprintf(name
, "sub%i", substream
->number
);
586 entry
= snd_info_create_card_entry(card
, name
,
587 substream
->pstr
->proc_root
);
590 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
591 if (snd_info_register(entry
) < 0) {
592 snd_info_free_entry(entry
);
595 substream
->proc_root
= entry
;
596 entry
= snd_info_create_card_entry(card
, "info", substream
->proc_root
);
598 snd_info_set_text_ops(entry
, substream
,
599 snd_pcm_substream_proc_info_read
);
600 if (snd_info_register(entry
) < 0) {
601 snd_info_free_entry(entry
);
605 substream
->proc_info_entry
= entry
;
606 entry
= snd_info_create_card_entry(card
, "hw_params",
607 substream
->proc_root
);
609 snd_info_set_text_ops(entry
, substream
,
610 snd_pcm_substream_proc_hw_params_read
);
611 if (snd_info_register(entry
) < 0) {
612 snd_info_free_entry(entry
);
616 substream
->proc_hw_params_entry
= entry
;
617 entry
= snd_info_create_card_entry(card
, "sw_params",
618 substream
->proc_root
);
620 snd_info_set_text_ops(entry
, substream
,
621 snd_pcm_substream_proc_sw_params_read
);
622 if (snd_info_register(entry
) < 0) {
623 snd_info_free_entry(entry
);
627 substream
->proc_sw_params_entry
= entry
;
628 entry
= snd_info_create_card_entry(card
, "status",
629 substream
->proc_root
);
631 snd_info_set_text_ops(entry
, substream
,
632 snd_pcm_substream_proc_status_read
);
633 if (snd_info_register(entry
) < 0) {
634 snd_info_free_entry(entry
);
638 substream
->proc_status_entry
= entry
;
640 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
641 entry
= snd_info_create_card_entry(card
, "xrun_injection",
642 substream
->proc_root
);
644 entry
->private_data
= substream
;
645 entry
->c
.text
.read
= NULL
;
646 entry
->c
.text
.write
= snd_pcm_xrun_injection_write
;
647 entry
->mode
= S_IFREG
| S_IWUSR
;
648 if (snd_info_register(entry
) < 0) {
649 snd_info_free_entry(entry
);
653 substream
->proc_xrun_injection_entry
= entry
;
654 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
659 static int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
)
661 snd_info_free_entry(substream
->proc_info_entry
);
662 substream
->proc_info_entry
= NULL
;
663 snd_info_free_entry(substream
->proc_hw_params_entry
);
664 substream
->proc_hw_params_entry
= NULL
;
665 snd_info_free_entry(substream
->proc_sw_params_entry
);
666 substream
->proc_sw_params_entry
= NULL
;
667 snd_info_free_entry(substream
->proc_status_entry
);
668 substream
->proc_status_entry
= NULL
;
669 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
670 snd_info_free_entry(substream
->proc_xrun_injection_entry
);
671 substream
->proc_xrun_injection_entry
= NULL
;
673 snd_info_free_entry(substream
->proc_root
);
674 substream
->proc_root
= NULL
;
677 #else /* !CONFIG_SND_VERBOSE_PROCFS */
678 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str
*pstr
) { return 0; }
679 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
) { return 0; }
680 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
) { return 0; }
681 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
) { return 0; }
682 #endif /* CONFIG_SND_VERBOSE_PROCFS */
684 static const struct attribute_group
*pcm_dev_attr_groups
[];
687 * snd_pcm_new_stream - create a new PCM stream
688 * @pcm: the pcm instance
689 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
690 * @substream_count: the number of substreams
692 * Creates a new stream for the pcm.
693 * The corresponding stream on the pcm must have been empty before
694 * calling this, i.e. zero must be given to the argument of
697 * Return: Zero if successful, or a negative error code on failure.
699 int snd_pcm_new_stream(struct snd_pcm
*pcm
, int stream
, int substream_count
)
702 struct snd_pcm_str
*pstr
= &pcm
->streams
[stream
];
703 struct snd_pcm_substream
*substream
, *prev
;
705 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
706 mutex_init(&pstr
->oss
.setup_mutex
);
708 pstr
->stream
= stream
;
710 pstr
->substream_count
= substream_count
;
711 if (!substream_count
)
714 snd_device_initialize(&pstr
->dev
, pcm
->card
);
715 pstr
->dev
.groups
= pcm_dev_attr_groups
;
716 dev_set_name(&pstr
->dev
, "pcmC%iD%i%c", pcm
->card
->number
, pcm
->device
,
717 stream
== SNDRV_PCM_STREAM_PLAYBACK
? 'p' : 'c');
719 if (!pcm
->internal
) {
720 err
= snd_pcm_stream_proc_init(pstr
);
722 pcm_err(pcm
, "Error in snd_pcm_stream_proc_init\n");
727 for (idx
= 0, prev
= NULL
; idx
< substream_count
; idx
++) {
728 substream
= kzalloc(sizeof(*substream
), GFP_KERNEL
);
731 substream
->pcm
= pcm
;
732 substream
->pstr
= pstr
;
733 substream
->number
= idx
;
734 substream
->stream
= stream
;
735 sprintf(substream
->name
, "subdevice #%i", idx
);
736 substream
->buffer_bytes_max
= UINT_MAX
;
738 pstr
->substream
= substream
;
740 prev
->next
= substream
;
742 if (!pcm
->internal
) {
743 err
= snd_pcm_substream_proc_init(substream
);
746 "Error in snd_pcm_stream_proc_init\n");
748 pstr
->substream
= NULL
;
755 substream
->group
= &substream
->self_group
;
756 spin_lock_init(&substream
->self_group
.lock
);
757 mutex_init(&substream
->self_group
.mutex
);
758 INIT_LIST_HEAD(&substream
->self_group
.substreams
);
759 list_add_tail(&substream
->link_list
, &substream
->self_group
.substreams
);
760 atomic_set(&substream
->mmap_count
, 0);
765 EXPORT_SYMBOL(snd_pcm_new_stream
);
767 static int _snd_pcm_new(struct snd_card
*card
, const char *id
, int device
,
768 int playback_count
, int capture_count
, bool internal
,
769 struct snd_pcm
**rpcm
)
773 static struct snd_device_ops ops
= {
774 .dev_free
= snd_pcm_dev_free
,
775 .dev_register
= snd_pcm_dev_register
,
776 .dev_disconnect
= snd_pcm_dev_disconnect
,
779 if (snd_BUG_ON(!card
))
783 pcm
= kzalloc(sizeof(*pcm
), GFP_KERNEL
);
787 pcm
->device
= device
;
788 pcm
->internal
= internal
;
789 mutex_init(&pcm
->open_mutex
);
790 init_waitqueue_head(&pcm
->open_wait
);
791 INIT_LIST_HEAD(&pcm
->list
);
793 strlcpy(pcm
->id
, id
, sizeof(pcm
->id
));
795 err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_PLAYBACK
,
800 err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_CAPTURE
, capture_count
);
804 err
= snd_device_new(card
, SNDRV_DEV_PCM
, pcm
, &ops
);
818 * snd_pcm_new - create a new PCM instance
819 * @card: the card instance
821 * @device: the device index (zero based)
822 * @playback_count: the number of substreams for playback
823 * @capture_count: the number of substreams for capture
824 * @rpcm: the pointer to store the new pcm instance
826 * Creates a new PCM instance.
828 * The pcm operators have to be set afterwards to the new instance
829 * via snd_pcm_set_ops().
831 * Return: Zero if successful, or a negative error code on failure.
833 int snd_pcm_new(struct snd_card
*card
, const char *id
, int device
,
834 int playback_count
, int capture_count
, struct snd_pcm
**rpcm
)
836 return _snd_pcm_new(card
, id
, device
, playback_count
, capture_count
,
839 EXPORT_SYMBOL(snd_pcm_new
);
842 * snd_pcm_new_internal - create a new internal PCM instance
843 * @card: the card instance
845 * @device: the device index (zero based - shared with normal PCMs)
846 * @playback_count: the number of substreams for playback
847 * @capture_count: the number of substreams for capture
848 * @rpcm: the pointer to store the new pcm instance
850 * Creates a new internal PCM instance with no userspace device or procfs
851 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
852 * will only be used internally by kernel drivers. i.e. it cannot be opened
853 * by userspace. It provides existing ASoC components drivers with a substream
854 * and access to any private data.
856 * The pcm operators have to be set afterwards to the new instance
857 * via snd_pcm_set_ops().
859 * Return: Zero if successful, or a negative error code on failure.
861 int snd_pcm_new_internal(struct snd_card
*card
, const char *id
, int device
,
862 int playback_count
, int capture_count
,
863 struct snd_pcm
**rpcm
)
865 return _snd_pcm_new(card
, id
, device
, playback_count
, capture_count
,
868 EXPORT_SYMBOL(snd_pcm_new_internal
);
870 static void free_chmap(struct snd_pcm_str
*pstr
)
872 if (pstr
->chmap_kctl
) {
873 snd_ctl_remove(pstr
->pcm
->card
, pstr
->chmap_kctl
);
874 pstr
->chmap_kctl
= NULL
;
878 static void snd_pcm_free_stream(struct snd_pcm_str
* pstr
)
880 struct snd_pcm_substream
*substream
, *substream_next
;
881 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
882 struct snd_pcm_oss_setup
*setup
, *setupn
;
884 substream
= pstr
->substream
;
886 substream_next
= substream
->next
;
887 snd_pcm_timer_done(substream
);
888 snd_pcm_substream_proc_done(substream
);
890 substream
= substream_next
;
892 snd_pcm_stream_proc_done(pstr
);
893 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
894 for (setup
= pstr
->oss
.setup_list
; setup
; setup
= setupn
) {
895 setupn
= setup
->next
;
896 kfree(setup
->task_name
);
901 if (pstr
->substream_count
)
902 put_device(&pstr
->dev
);
905 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
906 #define pcm_call_notify(pcm, call) \
908 struct snd_pcm_notify *_notify; \
909 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
910 _notify->call(pcm); \
913 #define pcm_call_notify(pcm, call) do {} while (0)
916 static int snd_pcm_free(struct snd_pcm
*pcm
)
921 pcm_call_notify(pcm
, n_unregister
);
922 if (pcm
->private_free
)
923 pcm
->private_free(pcm
);
924 snd_pcm_lib_preallocate_free_for_all(pcm
);
925 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
]);
926 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
]);
931 static int snd_pcm_dev_free(struct snd_device
*device
)
933 struct snd_pcm
*pcm
= device
->device_data
;
934 return snd_pcm_free(pcm
);
937 int snd_pcm_attach_substream(struct snd_pcm
*pcm
, int stream
,
939 struct snd_pcm_substream
**rsubstream
)
941 struct snd_pcm_str
* pstr
;
942 struct snd_pcm_substream
*substream
;
943 struct snd_pcm_runtime
*runtime
;
944 struct snd_card
*card
;
945 int prefer_subdevice
;
948 if (snd_BUG_ON(!pcm
|| !rsubstream
))
950 if (snd_BUG_ON(stream
!= SNDRV_PCM_STREAM_PLAYBACK
&&
951 stream
!= SNDRV_PCM_STREAM_CAPTURE
))
954 pstr
= &pcm
->streams
[stream
];
955 if (pstr
->substream
== NULL
|| pstr
->substream_count
== 0)
959 prefer_subdevice
= snd_ctl_get_preferred_subdevice(card
, SND_CTL_SUBDEV_PCM
);
961 if (pcm
->info_flags
& SNDRV_PCM_INFO_HALF_DUPLEX
) {
962 int opposite
= !stream
;
964 for (substream
= pcm
->streams
[opposite
].substream
; substream
;
965 substream
= substream
->next
) {
966 if (SUBSTREAM_BUSY(substream
))
971 if (file
->f_flags
& O_APPEND
) {
972 if (prefer_subdevice
< 0) {
973 if (pstr
->substream_count
> 1)
974 return -EINVAL
; /* must be unique */
975 substream
= pstr
->substream
;
977 for (substream
= pstr
->substream
; substream
;
978 substream
= substream
->next
)
979 if (substream
->number
== prefer_subdevice
)
984 if (! SUBSTREAM_BUSY(substream
))
986 substream
->ref_count
++;
987 *rsubstream
= substream
;
991 for (substream
= pstr
->substream
; substream
; substream
= substream
->next
) {
992 if (!SUBSTREAM_BUSY(substream
) &&
993 (prefer_subdevice
== -1 ||
994 substream
->number
== prefer_subdevice
))
997 if (substream
== NULL
)
1000 runtime
= kzalloc(sizeof(*runtime
), GFP_KERNEL
);
1001 if (runtime
== NULL
)
1004 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
));
1005 runtime
->status
= snd_malloc_pages(size
, GFP_KERNEL
);
1006 if (runtime
->status
== NULL
) {
1010 memset((void*)runtime
->status
, 0, size
);
1012 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
));
1013 runtime
->control
= snd_malloc_pages(size
, GFP_KERNEL
);
1014 if (runtime
->control
== NULL
) {
1015 snd_free_pages((void*)runtime
->status
,
1016 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
1020 memset((void*)runtime
->control
, 0, size
);
1022 init_waitqueue_head(&runtime
->sleep
);
1023 init_waitqueue_head(&runtime
->tsleep
);
1025 runtime
->status
->state
= SNDRV_PCM_STATE_OPEN
;
1027 substream
->runtime
= runtime
;
1028 substream
->private_data
= pcm
->private_data
;
1029 substream
->ref_count
= 1;
1030 substream
->f_flags
= file
->f_flags
;
1031 substream
->pid
= get_pid(task_pid(current
));
1032 pstr
->substream_opened
++;
1033 *rsubstream
= substream
;
1037 void snd_pcm_detach_substream(struct snd_pcm_substream
*substream
)
1039 struct snd_pcm_runtime
*runtime
;
1041 if (PCM_RUNTIME_CHECK(substream
))
1043 runtime
= substream
->runtime
;
1044 if (runtime
->private_free
!= NULL
)
1045 runtime
->private_free(runtime
);
1046 snd_free_pages((void*)runtime
->status
,
1047 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
1048 snd_free_pages((void*)runtime
->control
,
1049 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
)));
1050 kfree(runtime
->hw_constraints
.rules
);
1052 substream
->runtime
= NULL
;
1053 put_pid(substream
->pid
);
1054 substream
->pid
= NULL
;
1055 substream
->pstr
->substream_opened
--;
1058 static ssize_t
show_pcm_class(struct device
*dev
,
1059 struct device_attribute
*attr
, char *buf
)
1061 struct snd_pcm_str
*pstr
= container_of(dev
, struct snd_pcm_str
, dev
);
1062 struct snd_pcm
*pcm
= pstr
->pcm
;
1064 static const char *strs
[SNDRV_PCM_CLASS_LAST
+ 1] = {
1065 [SNDRV_PCM_CLASS_GENERIC
] = "generic",
1066 [SNDRV_PCM_CLASS_MULTI
] = "multi",
1067 [SNDRV_PCM_CLASS_MODEM
] = "modem",
1068 [SNDRV_PCM_CLASS_DIGITIZER
] = "digitizer",
1071 if (pcm
->dev_class
> SNDRV_PCM_CLASS_LAST
)
1074 str
= strs
[pcm
->dev_class
];
1075 return snprintf(buf
, PAGE_SIZE
, "%s\n", str
);
1078 static DEVICE_ATTR(pcm_class
, S_IRUGO
, show_pcm_class
, NULL
);
1079 static struct attribute
*pcm_dev_attrs
[] = {
1080 &dev_attr_pcm_class
.attr
,
1084 static const struct attribute_group pcm_dev_attr_group
= {
1085 .attrs
= pcm_dev_attrs
,
1088 static const struct attribute_group
*pcm_dev_attr_groups
[] = {
1089 &pcm_dev_attr_group
,
1093 static int snd_pcm_dev_register(struct snd_device
*device
)
1096 struct snd_pcm_substream
*substream
;
1097 struct snd_pcm
*pcm
;
1099 if (snd_BUG_ON(!device
|| !device
->device_data
))
1101 pcm
= device
->device_data
;
1105 mutex_lock(®ister_mutex
);
1106 err
= snd_pcm_add(pcm
);
1109 for (cidx
= 0; cidx
< 2; cidx
++) {
1111 if (pcm
->streams
[cidx
].substream
== NULL
)
1114 case SNDRV_PCM_STREAM_PLAYBACK
:
1115 devtype
= SNDRV_DEVICE_TYPE_PCM_PLAYBACK
;
1117 case SNDRV_PCM_STREAM_CAPTURE
:
1118 devtype
= SNDRV_DEVICE_TYPE_PCM_CAPTURE
;
1122 err
= snd_register_device(devtype
, pcm
->card
, pcm
->device
,
1123 &snd_pcm_f_ops
[cidx
], pcm
,
1124 &pcm
->streams
[cidx
].dev
);
1126 list_del_init(&pcm
->list
);
1130 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
)
1131 snd_pcm_timer_init(substream
);
1134 pcm_call_notify(pcm
, n_register
);
1137 mutex_unlock(®ister_mutex
);
1141 static int snd_pcm_dev_disconnect(struct snd_device
*device
)
1143 struct snd_pcm
*pcm
= device
->device_data
;
1144 struct snd_pcm_substream
*substream
;
1147 mutex_lock(®ister_mutex
);
1148 mutex_lock(&pcm
->open_mutex
);
1149 wake_up(&pcm
->open_wait
);
1150 list_del_init(&pcm
->list
);
1151 for (cidx
= 0; cidx
< 2; cidx
++) {
1152 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
) {
1153 snd_pcm_stream_lock_irq(substream
);
1154 if (substream
->runtime
) {
1155 substream
->runtime
->status
->state
= SNDRV_PCM_STATE_DISCONNECTED
;
1156 wake_up(&substream
->runtime
->sleep
);
1157 wake_up(&substream
->runtime
->tsleep
);
1159 snd_pcm_stream_unlock_irq(substream
);
1162 if (!pcm
->internal
) {
1163 pcm_call_notify(pcm
, n_disconnect
);
1165 for (cidx
= 0; cidx
< 2; cidx
++) {
1167 snd_unregister_device(&pcm
->streams
[cidx
].dev
);
1168 free_chmap(&pcm
->streams
[cidx
]);
1170 mutex_unlock(&pcm
->open_mutex
);
1171 mutex_unlock(®ister_mutex
);
1175 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
1177 * snd_pcm_notify - Add/remove the notify list
1178 * @notify: PCM notify list
1179 * @nfree: 0 = register, 1 = unregister
1181 * This adds the given notifier to the global list so that the callback is
1182 * called for each registered PCM devices. This exists only for PCM OSS
1183 * emulation, so far.
1185 int snd_pcm_notify(struct snd_pcm_notify
*notify
, int nfree
)
1187 struct snd_pcm
*pcm
;
1189 if (snd_BUG_ON(!notify
||
1190 !notify
->n_register
||
1191 !notify
->n_unregister
||
1192 !notify
->n_disconnect
))
1194 mutex_lock(®ister_mutex
);
1196 list_del(¬ify
->list
);
1197 list_for_each_entry(pcm
, &snd_pcm_devices
, list
)
1198 notify
->n_unregister(pcm
);
1200 list_add_tail(¬ify
->list
, &snd_pcm_notify_list
);
1201 list_for_each_entry(pcm
, &snd_pcm_devices
, list
)
1202 notify
->n_register(pcm
);
1204 mutex_unlock(®ister_mutex
);
1207 EXPORT_SYMBOL(snd_pcm_notify
);
1208 #endif /* CONFIG_SND_PCM_OSS */
1210 #ifdef CONFIG_SND_PROC_FS
1215 static void snd_pcm_proc_read(struct snd_info_entry
*entry
,
1216 struct snd_info_buffer
*buffer
)
1218 struct snd_pcm
*pcm
;
1220 mutex_lock(®ister_mutex
);
1221 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
1222 snd_iprintf(buffer
, "%02i-%02i: %s : %s",
1223 pcm
->card
->number
, pcm
->device
, pcm
->id
, pcm
->name
);
1224 if (pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream
)
1225 snd_iprintf(buffer
, " : playback %i",
1226 pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream_count
);
1227 if (pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream
)
1228 snd_iprintf(buffer
, " : capture %i",
1229 pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream_count
);
1230 snd_iprintf(buffer
, "\n");
1232 mutex_unlock(®ister_mutex
);
1235 static struct snd_info_entry
*snd_pcm_proc_entry
;
1237 static void snd_pcm_proc_init(void)
1239 struct snd_info_entry
*entry
;
1241 entry
= snd_info_create_module_entry(THIS_MODULE
, "pcm", NULL
);
1243 snd_info_set_text_ops(entry
, NULL
, snd_pcm_proc_read
);
1244 if (snd_info_register(entry
) < 0) {
1245 snd_info_free_entry(entry
);
1249 snd_pcm_proc_entry
= entry
;
1252 static void snd_pcm_proc_done(void)
1254 snd_info_free_entry(snd_pcm_proc_entry
);
1257 #else /* !CONFIG_SND_PROC_FS */
1258 #define snd_pcm_proc_init()
1259 #define snd_pcm_proc_done()
1260 #endif /* CONFIG_SND_PROC_FS */
1267 static int __init
alsa_pcm_init(void)
1269 snd_ctl_register_ioctl(snd_pcm_control_ioctl
);
1270 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl
);
1271 snd_pcm_proc_init();
1275 static void __exit
alsa_pcm_exit(void)
1277 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl
);
1278 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl
);
1279 snd_pcm_proc_done();
1282 module_init(alsa_pcm_init
)
1283 module_exit(alsa_pcm_exit
)