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 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
35 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36 MODULE_LICENSE("GPL");
38 static LIST_HEAD(snd_pcm_devices
);
39 static LIST_HEAD(snd_pcm_notify_list
);
40 static DEFINE_MUTEX(register_mutex
);
42 static int snd_pcm_free(struct snd_pcm
*pcm
);
43 static int snd_pcm_dev_free(struct snd_device
*device
);
44 static int snd_pcm_dev_register(struct snd_device
*device
);
45 static int snd_pcm_dev_disconnect(struct snd_device
*device
);
47 static struct snd_pcm
*snd_pcm_get(struct snd_card
*card
, int device
)
51 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
54 if (pcm
->card
== card
&& pcm
->device
== device
)
60 static int snd_pcm_next(struct snd_card
*card
, int device
)
64 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
)
79 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
80 if (pcm
->card
== newpcm
->card
&& pcm
->device
== newpcm
->device
)
82 if (pcm
->card
->number
> newpcm
->card
->number
||
83 (pcm
->card
== newpcm
->card
&&
84 pcm
->device
> newpcm
->device
)) {
85 list_add(&newpcm
->list
, pcm
->list
.prev
);
89 list_add_tail(&newpcm
->list
, &snd_pcm_devices
);
93 static int snd_pcm_control_ioctl(struct snd_card
*card
,
94 struct snd_ctl_file
*control
,
95 unsigned int cmd
, unsigned long arg
)
98 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE
:
102 if (get_user(device
, (int __user
*)arg
))
104 mutex_lock(®ister_mutex
);
105 device
= snd_pcm_next(card
, device
);
106 mutex_unlock(®ister_mutex
);
107 if (put_user(device
, (int __user
*)arg
))
111 case SNDRV_CTL_IOCTL_PCM_INFO
:
113 struct snd_pcm_info __user
*info
;
114 unsigned int device
, subdevice
;
117 struct snd_pcm_str
*pstr
;
118 struct snd_pcm_substream
*substream
;
121 info
= (struct snd_pcm_info __user
*)arg
;
122 if (get_user(device
, &info
->device
))
124 if (get_user(stream
, &info
->stream
))
126 if (stream
< 0 || stream
> 1)
128 if (get_user(subdevice
, &info
->subdevice
))
130 mutex_lock(®ister_mutex
);
131 pcm
= snd_pcm_get(card
, device
);
136 pstr
= &pcm
->streams
[stream
];
137 if (pstr
->substream_count
== 0) {
141 if (subdevice
>= pstr
->substream_count
) {
145 for (substream
= pstr
->substream
; substream
;
146 substream
= substream
->next
)
147 if (substream
->number
== (int)subdevice
)
149 if (substream
== NULL
) {
153 err
= snd_pcm_info_user(substream
, info
);
155 mutex_unlock(®ister_mutex
);
158 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE
:
162 if (get_user(val
, (int __user
*)arg
))
164 control
->preferred_subdevice
[SND_CTL_SUBDEV_PCM
] = val
;
171 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
173 static char *snd_pcm_format_names
[] = {
192 FORMAT(IEC958_SUBFRAME_LE
),
193 FORMAT(IEC958_SUBFRAME_BE
),
224 * snd_pcm_format_name - Return a name string for the given PCM format
225 * @format: PCM format
227 const char *snd_pcm_format_name(snd_pcm_format_t format
)
229 if ((__force
unsigned int)format
>= ARRAY_SIZE(snd_pcm_format_names
))
231 return snd_pcm_format_names
[(__force
unsigned int)format
];
233 EXPORT_SYMBOL_GPL(snd_pcm_format_name
);
235 #ifdef CONFIG_SND_VERBOSE_PROCFS
237 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
238 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
239 #define READY(v) [SNDRV_PCM_READY_##v] = #v
240 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
241 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
242 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
243 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
244 #define START(v) [SNDRV_PCM_START_##v] = #v
245 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
247 static char *snd_pcm_stream_names
[] = {
252 static char *snd_pcm_state_names
[] = {
263 static char *snd_pcm_access_names
[] = {
264 ACCESS(MMAP_INTERLEAVED
),
265 ACCESS(MMAP_NONINTERLEAVED
),
266 ACCESS(MMAP_COMPLEX
),
267 ACCESS(RW_INTERLEAVED
),
268 ACCESS(RW_NONINTERLEAVED
),
271 static char *snd_pcm_subformat_names
[] = {
275 static char *snd_pcm_tstamp_mode_names
[] = {
280 static const char *snd_pcm_stream_name(int stream
)
282 return snd_pcm_stream_names
[stream
];
285 static const char *snd_pcm_access_name(snd_pcm_access_t access
)
287 return snd_pcm_access_names
[(__force
int)access
];
290 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat
)
292 return snd_pcm_subformat_names
[(__force
int)subformat
];
295 static const char *snd_pcm_tstamp_mode_name(int mode
)
297 return snd_pcm_tstamp_mode_names
[mode
];
300 static const char *snd_pcm_state_name(snd_pcm_state_t state
)
302 return snd_pcm_state_names
[(__force
int)state
];
305 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
306 #include <linux/soundcard.h>
308 static const char *snd_pcm_oss_format_name(int format
)
337 static void snd_pcm_proc_info_read(struct snd_pcm_substream
*substream
,
338 struct snd_info_buffer
*buffer
)
340 struct snd_pcm_info
*info
;
346 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
348 pcm_dbg(substream
->pcm
,
349 "snd_pcm_proc_info_read: cannot malloc\n");
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 if ((entry
= snd_info_create_card_entry(pcm
->card
, name
, pcm
->card
->proc_root
)) == NULL
)
528 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
529 if (snd_info_register(entry
) < 0) {
530 snd_info_free_entry(entry
);
533 pstr
->proc_root
= entry
;
535 if ((entry
= snd_info_create_card_entry(pcm
->card
, "info", pstr
->proc_root
)) != NULL
) {
536 snd_info_set_text_ops(entry
, pstr
, snd_pcm_stream_proc_info_read
);
537 if (snd_info_register(entry
) < 0) {
538 snd_info_free_entry(entry
);
542 pstr
->proc_info_entry
= entry
;
544 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
545 if ((entry
= snd_info_create_card_entry(pcm
->card
, "xrun_debug",
546 pstr
->proc_root
)) != NULL
) {
547 entry
->c
.text
.read
= snd_pcm_xrun_debug_read
;
548 entry
->c
.text
.write
= snd_pcm_xrun_debug_write
;
549 entry
->mode
|= S_IWUSR
;
550 entry
->private_data
= pstr
;
551 if (snd_info_register(entry
) < 0) {
552 snd_info_free_entry(entry
);
556 pstr
->proc_xrun_debug_entry
= entry
;
561 static int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
)
563 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
564 snd_info_free_entry(pstr
->proc_xrun_debug_entry
);
565 pstr
->proc_xrun_debug_entry
= NULL
;
567 snd_info_free_entry(pstr
->proc_info_entry
);
568 pstr
->proc_info_entry
= NULL
;
569 snd_info_free_entry(pstr
->proc_root
);
570 pstr
->proc_root
= NULL
;
574 static int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
)
576 struct snd_info_entry
*entry
;
577 struct snd_card
*card
;
580 card
= substream
->pcm
->card
;
582 sprintf(name
, "sub%i", substream
->number
);
583 if ((entry
= snd_info_create_card_entry(card
, name
, substream
->pstr
->proc_root
)) == NULL
)
585 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
586 if (snd_info_register(entry
) < 0) {
587 snd_info_free_entry(entry
);
590 substream
->proc_root
= entry
;
592 if ((entry
= snd_info_create_card_entry(card
, "info", substream
->proc_root
)) != NULL
) {
593 snd_info_set_text_ops(entry
, substream
,
594 snd_pcm_substream_proc_info_read
);
595 if (snd_info_register(entry
) < 0) {
596 snd_info_free_entry(entry
);
600 substream
->proc_info_entry
= entry
;
602 if ((entry
= snd_info_create_card_entry(card
, "hw_params", substream
->proc_root
)) != NULL
) {
603 snd_info_set_text_ops(entry
, substream
,
604 snd_pcm_substream_proc_hw_params_read
);
605 if (snd_info_register(entry
) < 0) {
606 snd_info_free_entry(entry
);
610 substream
->proc_hw_params_entry
= entry
;
612 if ((entry
= snd_info_create_card_entry(card
, "sw_params", substream
->proc_root
)) != NULL
) {
613 snd_info_set_text_ops(entry
, substream
,
614 snd_pcm_substream_proc_sw_params_read
);
615 if (snd_info_register(entry
) < 0) {
616 snd_info_free_entry(entry
);
620 substream
->proc_sw_params_entry
= entry
;
622 if ((entry
= snd_info_create_card_entry(card
, "status", substream
->proc_root
)) != NULL
) {
623 snd_info_set_text_ops(entry
, substream
,
624 snd_pcm_substream_proc_status_read
);
625 if (snd_info_register(entry
) < 0) {
626 snd_info_free_entry(entry
);
630 substream
->proc_status_entry
= entry
;
632 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
633 entry
= snd_info_create_card_entry(card
, "xrun_injection",
634 substream
->proc_root
);
636 entry
->private_data
= substream
;
637 entry
->c
.text
.read
= NULL
;
638 entry
->c
.text
.write
= snd_pcm_xrun_injection_write
;
639 entry
->mode
= S_IFREG
| S_IWUSR
;
640 if (snd_info_register(entry
) < 0) {
641 snd_info_free_entry(entry
);
645 substream
->proc_xrun_injection_entry
= entry
;
646 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
651 static int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
)
653 snd_info_free_entry(substream
->proc_info_entry
);
654 substream
->proc_info_entry
= NULL
;
655 snd_info_free_entry(substream
->proc_hw_params_entry
);
656 substream
->proc_hw_params_entry
= NULL
;
657 snd_info_free_entry(substream
->proc_sw_params_entry
);
658 substream
->proc_sw_params_entry
= NULL
;
659 snd_info_free_entry(substream
->proc_status_entry
);
660 substream
->proc_status_entry
= NULL
;
661 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
662 snd_info_free_entry(substream
->proc_xrun_injection_entry
);
663 substream
->proc_xrun_injection_entry
= NULL
;
665 snd_info_free_entry(substream
->proc_root
);
666 substream
->proc_root
= NULL
;
669 #else /* !CONFIG_SND_VERBOSE_PROCFS */
670 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str
*pstr
) { return 0; }
671 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
) { return 0; }
672 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
) { return 0; }
673 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
) { return 0; }
674 #endif /* CONFIG_SND_VERBOSE_PROCFS */
676 static const struct attribute_group
*pcm_dev_attr_groups
[];
679 * snd_pcm_new_stream - create a new PCM stream
680 * @pcm: the pcm instance
681 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
682 * @substream_count: the number of substreams
684 * Creates a new stream for the pcm.
685 * The corresponding stream on the pcm must have been empty before
686 * calling this, i.e. zero must be given to the argument of
689 * Return: Zero if successful, or a negative error code on failure.
691 int snd_pcm_new_stream(struct snd_pcm
*pcm
, int stream
, int substream_count
)
694 struct snd_pcm_str
*pstr
= &pcm
->streams
[stream
];
695 struct snd_pcm_substream
*substream
, *prev
;
697 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
698 mutex_init(&pstr
->oss
.setup_mutex
);
700 pstr
->stream
= stream
;
702 pstr
->substream_count
= substream_count
;
703 if (!substream_count
)
706 snd_device_initialize(&pstr
->dev
, pcm
->card
);
707 pstr
->dev
.groups
= pcm_dev_attr_groups
;
708 dev_set_name(&pstr
->dev
, "pcmC%iD%i%c", pcm
->card
->number
, pcm
->device
,
709 stream
== SNDRV_PCM_STREAM_PLAYBACK
? 'p' : 'c');
711 if (!pcm
->internal
) {
712 err
= snd_pcm_stream_proc_init(pstr
);
714 pcm_err(pcm
, "Error in snd_pcm_stream_proc_init\n");
719 for (idx
= 0, prev
= NULL
; idx
< substream_count
; idx
++) {
720 substream
= kzalloc(sizeof(*substream
), GFP_KERNEL
);
721 if (substream
== NULL
) {
722 pcm_err(pcm
, "Cannot allocate PCM substream\n");
725 substream
->pcm
= pcm
;
726 substream
->pstr
= pstr
;
727 substream
->number
= idx
;
728 substream
->stream
= stream
;
729 sprintf(substream
->name
, "subdevice #%i", idx
);
730 substream
->buffer_bytes_max
= UINT_MAX
;
732 pstr
->substream
= substream
;
734 prev
->next
= substream
;
736 if (!pcm
->internal
) {
737 err
= snd_pcm_substream_proc_init(substream
);
740 "Error in snd_pcm_stream_proc_init\n");
742 pstr
->substream
= NULL
;
749 substream
->group
= &substream
->self_group
;
750 spin_lock_init(&substream
->self_group
.lock
);
751 mutex_init(&substream
->self_group
.mutex
);
752 INIT_LIST_HEAD(&substream
->self_group
.substreams
);
753 list_add_tail(&substream
->link_list
, &substream
->self_group
.substreams
);
754 atomic_set(&substream
->mmap_count
, 0);
759 EXPORT_SYMBOL(snd_pcm_new_stream
);
761 static int _snd_pcm_new(struct snd_card
*card
, const char *id
, int device
,
762 int playback_count
, int capture_count
, bool internal
,
763 struct snd_pcm
**rpcm
)
767 static struct snd_device_ops ops
= {
768 .dev_free
= snd_pcm_dev_free
,
769 .dev_register
= snd_pcm_dev_register
,
770 .dev_disconnect
= snd_pcm_dev_disconnect
,
773 if (snd_BUG_ON(!card
))
777 pcm
= kzalloc(sizeof(*pcm
), GFP_KERNEL
);
779 dev_err(card
->dev
, "Cannot allocate PCM\n");
783 pcm
->device
= device
;
784 pcm
->internal
= internal
;
786 strlcpy(pcm
->id
, id
, sizeof(pcm
->id
));
787 if ((err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_PLAYBACK
, playback_count
)) < 0) {
791 if ((err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_CAPTURE
, capture_count
)) < 0) {
795 mutex_init(&pcm
->open_mutex
);
796 init_waitqueue_head(&pcm
->open_wait
);
797 if ((err
= snd_device_new(card
, SNDRV_DEV_PCM
, pcm
, &ops
)) < 0) {
807 * snd_pcm_new - create a new PCM instance
808 * @card: the card instance
810 * @device: the device index (zero based)
811 * @playback_count: the number of substreams for playback
812 * @capture_count: the number of substreams for capture
813 * @rpcm: the pointer to store the new pcm instance
815 * Creates a new PCM instance.
817 * The pcm operators have to be set afterwards to the new instance
818 * via snd_pcm_set_ops().
820 * Return: Zero if successful, or a negative error code on failure.
822 int snd_pcm_new(struct snd_card
*card
, const char *id
, int device
,
823 int playback_count
, int capture_count
, struct snd_pcm
**rpcm
)
825 return _snd_pcm_new(card
, id
, device
, playback_count
, capture_count
,
828 EXPORT_SYMBOL(snd_pcm_new
);
831 * snd_pcm_new_internal - create a new internal PCM instance
832 * @card: the card instance
834 * @device: the device index (zero based - shared with normal PCMs)
835 * @playback_count: the number of substreams for playback
836 * @capture_count: the number of substreams for capture
837 * @rpcm: the pointer to store the new pcm instance
839 * Creates a new internal PCM instance with no userspace device or procfs
840 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
841 * will only be used internally by kernel drivers. i.e. it cannot be opened
842 * by userspace. It provides existing ASoC components drivers with a substream
843 * and access to any private data.
845 * The pcm operators have to be set afterwards to the new instance
846 * via snd_pcm_set_ops().
848 * Return: Zero if successful, or a negative error code on failure.
850 int snd_pcm_new_internal(struct snd_card
*card
, const char *id
, int device
,
851 int playback_count
, int capture_count
,
852 struct snd_pcm
**rpcm
)
854 return _snd_pcm_new(card
, id
, device
, playback_count
, capture_count
,
857 EXPORT_SYMBOL(snd_pcm_new_internal
);
859 static void snd_pcm_free_stream(struct snd_pcm_str
* pstr
)
861 struct snd_pcm_substream
*substream
, *substream_next
;
862 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
863 struct snd_pcm_oss_setup
*setup
, *setupn
;
865 substream
= pstr
->substream
;
867 substream_next
= substream
->next
;
868 snd_pcm_timer_done(substream
);
869 snd_pcm_substream_proc_done(substream
);
871 substream
= substream_next
;
873 snd_pcm_stream_proc_done(pstr
);
874 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
875 for (setup
= pstr
->oss
.setup_list
; setup
; setup
= setupn
) {
876 setupn
= setup
->next
;
877 kfree(setup
->task_name
);
881 if (pstr
->substream_count
)
882 put_device(&pstr
->dev
);
885 static int snd_pcm_free(struct snd_pcm
*pcm
)
887 struct snd_pcm_notify
*notify
;
891 list_for_each_entry(notify
, &snd_pcm_notify_list
, list
) {
892 notify
->n_unregister(pcm
);
894 if (pcm
->private_free
)
895 pcm
->private_free(pcm
);
896 snd_pcm_lib_preallocate_free_for_all(pcm
);
897 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
]);
898 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
]);
903 static int snd_pcm_dev_free(struct snd_device
*device
)
905 struct snd_pcm
*pcm
= device
->device_data
;
906 return snd_pcm_free(pcm
);
909 int snd_pcm_attach_substream(struct snd_pcm
*pcm
, int stream
,
911 struct snd_pcm_substream
**rsubstream
)
913 struct snd_pcm_str
* pstr
;
914 struct snd_pcm_substream
*substream
;
915 struct snd_pcm_runtime
*runtime
;
916 struct snd_card
*card
;
917 int prefer_subdevice
;
920 if (snd_BUG_ON(!pcm
|| !rsubstream
))
923 pstr
= &pcm
->streams
[stream
];
924 if (pstr
->substream
== NULL
|| pstr
->substream_count
== 0)
928 prefer_subdevice
= snd_ctl_get_preferred_subdevice(card
, SND_CTL_SUBDEV_PCM
);
931 case SNDRV_PCM_STREAM_PLAYBACK
:
932 if (pcm
->info_flags
& SNDRV_PCM_INFO_HALF_DUPLEX
) {
933 for (substream
= pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream
; substream
; substream
= substream
->next
) {
934 if (SUBSTREAM_BUSY(substream
))
939 case SNDRV_PCM_STREAM_CAPTURE
:
940 if (pcm
->info_flags
& SNDRV_PCM_INFO_HALF_DUPLEX
) {
941 for (substream
= pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream
; substream
; substream
= substream
->next
) {
942 if (SUBSTREAM_BUSY(substream
))
951 if (file
->f_flags
& O_APPEND
) {
952 if (prefer_subdevice
< 0) {
953 if (pstr
->substream_count
> 1)
954 return -EINVAL
; /* must be unique */
955 substream
= pstr
->substream
;
957 for (substream
= pstr
->substream
; substream
;
958 substream
= substream
->next
)
959 if (substream
->number
== prefer_subdevice
)
964 if (! SUBSTREAM_BUSY(substream
))
966 substream
->ref_count
++;
967 *rsubstream
= substream
;
971 if (prefer_subdevice
>= 0) {
972 for (substream
= pstr
->substream
; substream
; substream
= substream
->next
)
973 if (!SUBSTREAM_BUSY(substream
) && substream
->number
== prefer_subdevice
)
976 for (substream
= pstr
->substream
; substream
; substream
= substream
->next
)
977 if (!SUBSTREAM_BUSY(substream
))
980 if (substream
== NULL
)
983 runtime
= kzalloc(sizeof(*runtime
), GFP_KERNEL
);
987 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
));
988 runtime
->status
= snd_malloc_pages(size
, GFP_KERNEL
);
989 if (runtime
->status
== NULL
) {
993 memset((void*)runtime
->status
, 0, size
);
995 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
));
996 runtime
->control
= snd_malloc_pages(size
, GFP_KERNEL
);
997 if (runtime
->control
== NULL
) {
998 snd_free_pages((void*)runtime
->status
,
999 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
1003 memset((void*)runtime
->control
, 0, size
);
1005 init_waitqueue_head(&runtime
->sleep
);
1006 init_waitqueue_head(&runtime
->tsleep
);
1008 runtime
->status
->state
= SNDRV_PCM_STATE_OPEN
;
1010 substream
->runtime
= runtime
;
1011 substream
->private_data
= pcm
->private_data
;
1012 substream
->ref_count
= 1;
1013 substream
->f_flags
= file
->f_flags
;
1014 substream
->pid
= get_pid(task_pid(current
));
1015 pstr
->substream_opened
++;
1016 *rsubstream
= substream
;
1020 void snd_pcm_detach_substream(struct snd_pcm_substream
*substream
)
1022 struct snd_pcm_runtime
*runtime
;
1024 if (PCM_RUNTIME_CHECK(substream
))
1026 runtime
= substream
->runtime
;
1027 if (runtime
->private_free
!= NULL
)
1028 runtime
->private_free(runtime
);
1029 snd_free_pages((void*)runtime
->status
,
1030 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
1031 snd_free_pages((void*)runtime
->control
,
1032 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
)));
1033 kfree(runtime
->hw_constraints
.rules
);
1034 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
1035 kfree(runtime
->hwptr_log
);
1038 substream
->runtime
= NULL
;
1039 put_pid(substream
->pid
);
1040 substream
->pid
= NULL
;
1041 substream
->pstr
->substream_opened
--;
1044 static ssize_t
show_pcm_class(struct device
*dev
,
1045 struct device_attribute
*attr
, char *buf
)
1047 struct snd_pcm
*pcm
;
1049 static const char *strs
[SNDRV_PCM_CLASS_LAST
+ 1] = {
1050 [SNDRV_PCM_CLASS_GENERIC
] = "generic",
1051 [SNDRV_PCM_CLASS_MULTI
] = "multi",
1052 [SNDRV_PCM_CLASS_MODEM
] = "modem",
1053 [SNDRV_PCM_CLASS_DIGITIZER
] = "digitizer",
1056 if (! (pcm
= dev_get_drvdata(dev
)) ||
1057 pcm
->dev_class
> SNDRV_PCM_CLASS_LAST
)
1060 str
= strs
[pcm
->dev_class
];
1061 return snprintf(buf
, PAGE_SIZE
, "%s\n", str
);
1064 static DEVICE_ATTR(pcm_class
, S_IRUGO
, show_pcm_class
, NULL
);
1065 static struct attribute
*pcm_dev_attrs
[] = {
1066 &dev_attr_pcm_class
.attr
,
1070 static struct attribute_group pcm_dev_attr_group
= {
1071 .attrs
= pcm_dev_attrs
,
1074 static const struct attribute_group
*pcm_dev_attr_groups
[] = {
1075 &pcm_dev_attr_group
,
1079 static int snd_pcm_dev_register(struct snd_device
*device
)
1082 struct snd_pcm_substream
*substream
;
1083 struct snd_pcm_notify
*notify
;
1084 struct snd_pcm
*pcm
;
1086 if (snd_BUG_ON(!device
|| !device
->device_data
))
1088 pcm
= device
->device_data
;
1089 mutex_lock(®ister_mutex
);
1090 err
= snd_pcm_add(pcm
);
1092 mutex_unlock(®ister_mutex
);
1095 for (cidx
= 0; cidx
< 2; cidx
++) {
1097 if (pcm
->streams
[cidx
].substream
== NULL
|| pcm
->internal
)
1100 case SNDRV_PCM_STREAM_PLAYBACK
:
1101 devtype
= SNDRV_DEVICE_TYPE_PCM_PLAYBACK
;
1103 case SNDRV_PCM_STREAM_CAPTURE
:
1104 devtype
= SNDRV_DEVICE_TYPE_PCM_CAPTURE
;
1108 err
= snd_register_device(devtype
, pcm
->card
, pcm
->device
,
1109 &snd_pcm_f_ops
[cidx
], pcm
,
1110 &pcm
->streams
[cidx
].dev
);
1112 list_del(&pcm
->list
);
1113 mutex_unlock(®ister_mutex
);
1117 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
)
1118 snd_pcm_timer_init(substream
);
1121 list_for_each_entry(notify
, &snd_pcm_notify_list
, list
)
1122 notify
->n_register(pcm
);
1124 mutex_unlock(®ister_mutex
);
1128 static int snd_pcm_dev_disconnect(struct snd_device
*device
)
1130 struct snd_pcm
*pcm
= device
->device_data
;
1131 struct snd_pcm_notify
*notify
;
1132 struct snd_pcm_substream
*substream
;
1135 mutex_lock(®ister_mutex
);
1136 if (list_empty(&pcm
->list
))
1139 mutex_lock(&pcm
->open_mutex
);
1140 wake_up(&pcm
->open_wait
);
1141 list_del_init(&pcm
->list
);
1142 for (cidx
= 0; cidx
< 2; cidx
++)
1143 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
) {
1144 snd_pcm_stream_lock_irq(substream
);
1145 if (substream
->runtime
) {
1146 substream
->runtime
->status
->state
= SNDRV_PCM_STATE_DISCONNECTED
;
1147 wake_up(&substream
->runtime
->sleep
);
1148 wake_up(&substream
->runtime
->tsleep
);
1150 snd_pcm_stream_unlock_irq(substream
);
1152 list_for_each_entry(notify
, &snd_pcm_notify_list
, list
) {
1153 notify
->n_disconnect(pcm
);
1155 for (cidx
= 0; cidx
< 2; cidx
++) {
1156 snd_unregister_device(&pcm
->streams
[cidx
].dev
);
1157 if (pcm
->streams
[cidx
].chmap_kctl
) {
1158 snd_ctl_remove(pcm
->card
, pcm
->streams
[cidx
].chmap_kctl
);
1159 pcm
->streams
[cidx
].chmap_kctl
= NULL
;
1162 mutex_unlock(&pcm
->open_mutex
);
1164 mutex_unlock(®ister_mutex
);
1169 * snd_pcm_notify - Add/remove the notify list
1170 * @notify: PCM notify list
1171 * @nfree: 0 = register, 1 = unregister
1173 * This adds the given notifier to the global list so that the callback is
1174 * called for each registered PCM devices. This exists only for PCM OSS
1175 * emulation, so far.
1177 int snd_pcm_notify(struct snd_pcm_notify
*notify
, int nfree
)
1179 struct snd_pcm
*pcm
;
1181 if (snd_BUG_ON(!notify
||
1182 !notify
->n_register
||
1183 !notify
->n_unregister
||
1184 !notify
->n_disconnect
))
1186 mutex_lock(®ister_mutex
);
1188 list_del(¬ify
->list
);
1189 list_for_each_entry(pcm
, &snd_pcm_devices
, list
)
1190 notify
->n_unregister(pcm
);
1192 list_add_tail(¬ify
->list
, &snd_pcm_notify_list
);
1193 list_for_each_entry(pcm
, &snd_pcm_devices
, list
)
1194 notify
->n_register(pcm
);
1196 mutex_unlock(®ister_mutex
);
1199 EXPORT_SYMBOL(snd_pcm_notify
);
1201 #ifdef CONFIG_PROC_FS
1206 static void snd_pcm_proc_read(struct snd_info_entry
*entry
,
1207 struct snd_info_buffer
*buffer
)
1209 struct snd_pcm
*pcm
;
1211 mutex_lock(®ister_mutex
);
1212 list_for_each_entry(pcm
, &snd_pcm_devices
, list
) {
1213 snd_iprintf(buffer
, "%02i-%02i: %s : %s",
1214 pcm
->card
->number
, pcm
->device
, pcm
->id
, pcm
->name
);
1215 if (pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream
)
1216 snd_iprintf(buffer
, " : playback %i",
1217 pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream_count
);
1218 if (pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream
)
1219 snd_iprintf(buffer
, " : capture %i",
1220 pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream_count
);
1221 snd_iprintf(buffer
, "\n");
1223 mutex_unlock(®ister_mutex
);
1226 static struct snd_info_entry
*snd_pcm_proc_entry
;
1228 static void snd_pcm_proc_init(void)
1230 struct snd_info_entry
*entry
;
1232 if ((entry
= snd_info_create_module_entry(THIS_MODULE
, "pcm", NULL
)) != NULL
) {
1233 snd_info_set_text_ops(entry
, NULL
, snd_pcm_proc_read
);
1234 if (snd_info_register(entry
) < 0) {
1235 snd_info_free_entry(entry
);
1239 snd_pcm_proc_entry
= entry
;
1242 static void snd_pcm_proc_done(void)
1244 snd_info_free_entry(snd_pcm_proc_entry
);
1247 #else /* !CONFIG_PROC_FS */
1248 #define snd_pcm_proc_init()
1249 #define snd_pcm_proc_done()
1250 #endif /* CONFIG_PROC_FS */
1257 static int __init
alsa_pcm_init(void)
1259 snd_ctl_register_ioctl(snd_pcm_control_ioctl
);
1260 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl
);
1261 snd_pcm_proc_init();
1265 static void __exit
alsa_pcm_exit(void)
1267 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl
);
1268 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl
);
1269 snd_pcm_proc_done();
1272 module_init(alsa_pcm_init
)
1273 module_exit(alsa_pcm_exit
)