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 <linux/mutex.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/pcm.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
35 MODULE_LICENSE("GPL");
37 static LIST_HEAD(snd_pcm_devices
);
38 static LIST_HEAD(snd_pcm_notify_list
);
39 static DEFINE_MUTEX(register_mutex
);
41 static int snd_pcm_free(struct snd_pcm
*pcm
);
42 static int snd_pcm_dev_free(struct snd_device
*device
);
43 static int snd_pcm_dev_register(struct snd_device
*device
);
44 static int snd_pcm_dev_disconnect(struct snd_device
*device
);
46 static struct snd_pcm
*snd_pcm_search(struct snd_card
*card
, int device
)
51 list_for_each(p
, &snd_pcm_devices
) {
52 pcm
= list_entry(p
, struct snd_pcm
, list
);
53 if (pcm
->card
== card
&& pcm
->device
== device
)
59 static int snd_pcm_control_ioctl(struct snd_card
*card
,
60 struct snd_ctl_file
*control
,
61 unsigned int cmd
, unsigned long arg
)
64 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE
:
68 if (get_user(device
, (int __user
*)arg
))
70 mutex_lock(®ister_mutex
);
71 device
= device
< 0 ? 0 : device
+ 1;
72 while (device
< SNDRV_PCM_DEVICES
) {
73 if (snd_pcm_search(card
, device
))
77 if (device
== SNDRV_PCM_DEVICES
)
79 mutex_unlock(®ister_mutex
);
80 if (put_user(device
, (int __user
*)arg
))
84 case SNDRV_CTL_IOCTL_PCM_INFO
:
86 struct snd_pcm_info __user
*info
;
87 unsigned int device
, subdevice
;
90 struct snd_pcm_str
*pstr
;
91 struct snd_pcm_substream
*substream
;
94 info
= (struct snd_pcm_info __user
*)arg
;
95 if (get_user(device
, &info
->device
))
97 if (get_user(stream
, &info
->stream
))
99 if (stream
< 0 || stream
> 1)
101 if (get_user(subdevice
, &info
->subdevice
))
103 mutex_lock(®ister_mutex
);
104 pcm
= snd_pcm_search(card
, device
);
109 pstr
= &pcm
->streams
[stream
];
110 if (pstr
->substream_count
== 0) {
114 if (subdevice
>= pstr
->substream_count
) {
118 for (substream
= pstr
->substream
; substream
;
119 substream
= substream
->next
)
120 if (substream
->number
== (int)subdevice
)
122 if (substream
== NULL
) {
126 err
= snd_pcm_info_user(substream
, info
);
128 mutex_unlock(®ister_mutex
);
131 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE
:
135 if (get_user(val
, (int __user
*)arg
))
137 control
->prefer_pcm_subdevice
= val
;
144 #ifdef CONFIG_SND_VERBOSE_PROCFS
146 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
147 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
148 #define READY(v) [SNDRV_PCM_READY_##v] = #v
149 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
150 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
151 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
152 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
153 #define START(v) [SNDRV_PCM_START_##v] = #v
154 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
155 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
157 static char *snd_pcm_format_names
[] = {
176 FORMAT(IEC958_SUBFRAME_LE
),
177 FORMAT(IEC958_SUBFRAME_BE
),
198 static const char *snd_pcm_format_name(snd_pcm_format_t format
)
200 return snd_pcm_format_names
[format
];
203 static char *snd_pcm_stream_names
[] = {
208 static char *snd_pcm_state_names
[] = {
219 static char *snd_pcm_access_names
[] = {
220 ACCESS(MMAP_INTERLEAVED
),
221 ACCESS(MMAP_NONINTERLEAVED
),
222 ACCESS(MMAP_COMPLEX
),
223 ACCESS(RW_INTERLEAVED
),
224 ACCESS(RW_NONINTERLEAVED
),
227 static char *snd_pcm_subformat_names
[] = {
231 static char *snd_pcm_tstamp_mode_names
[] = {
236 static const char *snd_pcm_stream_name(int stream
)
238 snd_assert(stream
<= SNDRV_PCM_STREAM_LAST
, return NULL
);
239 return snd_pcm_stream_names
[stream
];
242 static const char *snd_pcm_access_name(snd_pcm_access_t access
)
244 return snd_pcm_access_names
[access
];
247 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat
)
249 return snd_pcm_subformat_names
[subformat
];
252 static const char *snd_pcm_tstamp_mode_name(int mode
)
254 snd_assert(mode
<= SNDRV_PCM_TSTAMP_LAST
, return NULL
);
255 return snd_pcm_tstamp_mode_names
[mode
];
258 static const char *snd_pcm_state_name(snd_pcm_state_t state
)
260 return snd_pcm_state_names
[state
];
263 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
264 #include <linux/soundcard.h>
266 static const char *snd_pcm_oss_format_name(int format
)
295 static void snd_pcm_proc_info_read(struct snd_pcm_substream
*substream
,
296 struct snd_info_buffer
*buffer
)
298 struct snd_pcm_info
*info
;
304 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
306 printk(KERN_DEBUG
"snd_pcm_proc_info_read: cannot malloc\n");
310 err
= snd_pcm_info(substream
, info
);
312 snd_iprintf(buffer
, "error %d\n", err
);
316 snd_iprintf(buffer
, "card: %d\n", info
->card
);
317 snd_iprintf(buffer
, "device: %d\n", info
->device
);
318 snd_iprintf(buffer
, "subdevice: %d\n", info
->subdevice
);
319 snd_iprintf(buffer
, "stream: %s\n", snd_pcm_stream_name(info
->stream
));
320 snd_iprintf(buffer
, "id: %s\n", info
->id
);
321 snd_iprintf(buffer
, "name: %s\n", info
->name
);
322 snd_iprintf(buffer
, "subname: %s\n", info
->subname
);
323 snd_iprintf(buffer
, "class: %d\n", info
->dev_class
);
324 snd_iprintf(buffer
, "subclass: %d\n", info
->dev_subclass
);
325 snd_iprintf(buffer
, "subdevices_count: %d\n", info
->subdevices_count
);
326 snd_iprintf(buffer
, "subdevices_avail: %d\n", info
->subdevices_avail
);
330 static void snd_pcm_stream_proc_info_read(struct snd_info_entry
*entry
,
331 struct snd_info_buffer
*buffer
)
333 snd_pcm_proc_info_read(((struct snd_pcm_str
*)entry
->private_data
)->substream
,
337 static void snd_pcm_substream_proc_info_read(struct snd_info_entry
*entry
,
338 struct snd_info_buffer
*buffer
)
340 snd_pcm_proc_info_read((struct snd_pcm_substream
*)entry
->private_data
,
344 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry
*entry
,
345 struct snd_info_buffer
*buffer
)
347 struct snd_pcm_substream
*substream
= entry
->private_data
;
348 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
350 snd_iprintf(buffer
, "closed\n");
353 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
) {
354 snd_iprintf(buffer
, "no setup\n");
357 snd_iprintf(buffer
, "access: %s\n", snd_pcm_access_name(runtime
->access
));
358 snd_iprintf(buffer
, "format: %s\n", snd_pcm_format_name(runtime
->format
));
359 snd_iprintf(buffer
, "subformat: %s\n", snd_pcm_subformat_name(runtime
->subformat
));
360 snd_iprintf(buffer
, "channels: %u\n", runtime
->channels
);
361 snd_iprintf(buffer
, "rate: %u (%u/%u)\n", runtime
->rate
, runtime
->rate_num
, runtime
->rate_den
);
362 snd_iprintf(buffer
, "period_size: %lu\n", runtime
->period_size
);
363 snd_iprintf(buffer
, "buffer_size: %lu\n", runtime
->buffer_size
);
364 snd_iprintf(buffer
, "tick_time: %u\n", runtime
->tick_time
);
365 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
366 if (substream
->oss
.oss
) {
367 snd_iprintf(buffer
, "OSS format: %s\n", snd_pcm_oss_format_name(runtime
->oss
.format
));
368 snd_iprintf(buffer
, "OSS channels: %u\n", runtime
->oss
.channels
);
369 snd_iprintf(buffer
, "OSS rate: %u\n", runtime
->oss
.rate
);
370 snd_iprintf(buffer
, "OSS period bytes: %lu\n", (unsigned long)runtime
->oss
.period_bytes
);
371 snd_iprintf(buffer
, "OSS periods: %u\n", runtime
->oss
.periods
);
372 snd_iprintf(buffer
, "OSS period frames: %lu\n", (unsigned long)runtime
->oss
.period_frames
);
377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry
*entry
,
378 struct snd_info_buffer
*buffer
)
380 struct snd_pcm_substream
*substream
= entry
->private_data
;
381 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
383 snd_iprintf(buffer
, "closed\n");
386 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
) {
387 snd_iprintf(buffer
, "no setup\n");
390 snd_iprintf(buffer
, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime
->tstamp_mode
));
391 snd_iprintf(buffer
, "period_step: %u\n", runtime
->period_step
);
392 snd_iprintf(buffer
, "sleep_min: %u\n", runtime
->sleep_min
);
393 snd_iprintf(buffer
, "avail_min: %lu\n", runtime
->control
->avail_min
);
394 snd_iprintf(buffer
, "xfer_align: %lu\n", runtime
->xfer_align
);
395 snd_iprintf(buffer
, "start_threshold: %lu\n", runtime
->start_threshold
);
396 snd_iprintf(buffer
, "stop_threshold: %lu\n", runtime
->stop_threshold
);
397 snd_iprintf(buffer
, "silence_threshold: %lu\n", runtime
->silence_threshold
);
398 snd_iprintf(buffer
, "silence_size: %lu\n", runtime
->silence_size
);
399 snd_iprintf(buffer
, "boundary: %lu\n", runtime
->boundary
);
402 static void snd_pcm_substream_proc_status_read(struct snd_info_entry
*entry
,
403 struct snd_info_buffer
*buffer
)
405 struct snd_pcm_substream
*substream
= entry
->private_data
;
406 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
407 struct snd_pcm_status status
;
410 snd_iprintf(buffer
, "closed\n");
413 memset(&status
, 0, sizeof(status
));
414 err
= snd_pcm_status(substream
, &status
);
416 snd_iprintf(buffer
, "error %d\n", err
);
419 snd_iprintf(buffer
, "state: %s\n", snd_pcm_state_name(status
.state
));
420 snd_iprintf(buffer
, "trigger_time: %ld.%09ld\n",
421 status
.trigger_tstamp
.tv_sec
, status
.trigger_tstamp
.tv_nsec
);
422 snd_iprintf(buffer
, "tstamp : %ld.%09ld\n",
423 status
.tstamp
.tv_sec
, status
.tstamp
.tv_nsec
);
424 snd_iprintf(buffer
, "delay : %ld\n", status
.delay
);
425 snd_iprintf(buffer
, "avail : %ld\n", status
.avail
);
426 snd_iprintf(buffer
, "avail_max : %ld\n", status
.avail_max
);
427 snd_iprintf(buffer
, "-----\n");
428 snd_iprintf(buffer
, "hw_ptr : %ld\n", runtime
->status
->hw_ptr
);
429 snd_iprintf(buffer
, "appl_ptr : %ld\n", runtime
->control
->appl_ptr
);
432 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
433 static void snd_pcm_xrun_debug_read(struct snd_info_entry
*entry
,
434 struct snd_info_buffer
*buffer
)
436 struct snd_pcm_str
*pstr
= entry
->private_data
;
437 snd_iprintf(buffer
, "%d\n", pstr
->xrun_debug
);
440 static void snd_pcm_xrun_debug_write(struct snd_info_entry
*entry
,
441 struct snd_info_buffer
*buffer
)
443 struct snd_pcm_str
*pstr
= entry
->private_data
;
445 if (!snd_info_get_line(buffer
, line
, sizeof(line
)))
446 pstr
->xrun_debug
= simple_strtoul(line
, NULL
, 10);
450 static int snd_pcm_stream_proc_init(struct snd_pcm_str
*pstr
)
452 struct snd_pcm
*pcm
= pstr
->pcm
;
453 struct snd_info_entry
*entry
;
456 sprintf(name
, "pcm%i%c", pcm
->device
,
457 pstr
->stream
== SNDRV_PCM_STREAM_PLAYBACK
? 'p' : 'c');
458 if ((entry
= snd_info_create_card_entry(pcm
->card
, name
, pcm
->card
->proc_root
)) == NULL
)
460 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
461 if (snd_info_register(entry
) < 0) {
462 snd_info_free_entry(entry
);
465 pstr
->proc_root
= entry
;
467 if ((entry
= snd_info_create_card_entry(pcm
->card
, "info", pstr
->proc_root
)) != NULL
) {
468 snd_info_set_text_ops(entry
, pstr
, snd_pcm_stream_proc_info_read
);
469 if (snd_info_register(entry
) < 0) {
470 snd_info_free_entry(entry
);
474 pstr
->proc_info_entry
= entry
;
476 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
477 if ((entry
= snd_info_create_card_entry(pcm
->card
, "xrun_debug",
478 pstr
->proc_root
)) != NULL
) {
479 entry
->c
.text
.read
= snd_pcm_xrun_debug_read
;
480 entry
->c
.text
.write
= snd_pcm_xrun_debug_write
;
481 entry
->mode
|= S_IWUSR
;
482 entry
->private_data
= pstr
;
483 if (snd_info_register(entry
) < 0) {
484 snd_info_free_entry(entry
);
488 pstr
->proc_xrun_debug_entry
= entry
;
493 static int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
)
495 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
496 snd_info_free_entry(pstr
->proc_xrun_debug_entry
);
497 pstr
->proc_xrun_debug_entry
= NULL
;
499 snd_info_free_entry(pstr
->proc_info_entry
);
500 pstr
->proc_info_entry
= NULL
;
501 snd_info_free_entry(pstr
->proc_root
);
502 pstr
->proc_root
= NULL
;
506 static int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
)
508 struct snd_info_entry
*entry
;
509 struct snd_card
*card
;
512 card
= substream
->pcm
->card
;
514 sprintf(name
, "sub%i", substream
->number
);
515 if ((entry
= snd_info_create_card_entry(card
, name
, substream
->pstr
->proc_root
)) == NULL
)
517 entry
->mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
518 if (snd_info_register(entry
) < 0) {
519 snd_info_free_entry(entry
);
522 substream
->proc_root
= entry
;
524 if ((entry
= snd_info_create_card_entry(card
, "info", substream
->proc_root
)) != NULL
) {
525 snd_info_set_text_ops(entry
, substream
,
526 snd_pcm_substream_proc_info_read
);
527 if (snd_info_register(entry
) < 0) {
528 snd_info_free_entry(entry
);
532 substream
->proc_info_entry
= entry
;
534 if ((entry
= snd_info_create_card_entry(card
, "hw_params", substream
->proc_root
)) != NULL
) {
535 snd_info_set_text_ops(entry
, substream
,
536 snd_pcm_substream_proc_hw_params_read
);
537 if (snd_info_register(entry
) < 0) {
538 snd_info_free_entry(entry
);
542 substream
->proc_hw_params_entry
= entry
;
544 if ((entry
= snd_info_create_card_entry(card
, "sw_params", substream
->proc_root
)) != NULL
) {
545 snd_info_set_text_ops(entry
, substream
,
546 snd_pcm_substream_proc_sw_params_read
);
547 if (snd_info_register(entry
) < 0) {
548 snd_info_free_entry(entry
);
552 substream
->proc_sw_params_entry
= entry
;
554 if ((entry
= snd_info_create_card_entry(card
, "status", substream
->proc_root
)) != NULL
) {
555 snd_info_set_text_ops(entry
, substream
,
556 snd_pcm_substream_proc_status_read
);
557 if (snd_info_register(entry
) < 0) {
558 snd_info_free_entry(entry
);
562 substream
->proc_status_entry
= entry
;
567 static int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
)
569 snd_info_free_entry(substream
->proc_info_entry
);
570 substream
->proc_info_entry
= NULL
;
571 snd_info_free_entry(substream
->proc_hw_params_entry
);
572 substream
->proc_hw_params_entry
= NULL
;
573 snd_info_free_entry(substream
->proc_sw_params_entry
);
574 substream
->proc_sw_params_entry
= NULL
;
575 snd_info_free_entry(substream
->proc_status_entry
);
576 substream
->proc_status_entry
= NULL
;
577 snd_info_free_entry(substream
->proc_root
);
578 substream
->proc_root
= NULL
;
581 #else /* !CONFIG_SND_VERBOSE_PROCFS */
582 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str
*pstr
) { return 0; }
583 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str
*pstr
) { return 0; }
584 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream
*substream
) { return 0; }
585 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream
*substream
) { return 0; }
586 #endif /* CONFIG_SND_VERBOSE_PROCFS */
589 * snd_pcm_new_stream - create a new PCM stream
590 * @pcm: the pcm instance
591 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
592 * @substream_count: the number of substreams
594 * Creates a new stream for the pcm.
595 * The corresponding stream on the pcm must have been empty before
596 * calling this, i.e. zero must be given to the argument of
599 * Returns zero if successful, or a negative error code on failure.
601 int snd_pcm_new_stream(struct snd_pcm
*pcm
, int stream
, int substream_count
)
604 struct snd_pcm_str
*pstr
= &pcm
->streams
[stream
];
605 struct snd_pcm_substream
*substream
, *prev
;
607 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
608 mutex_init(&pstr
->oss
.setup_mutex
);
610 pstr
->stream
= stream
;
612 pstr
->substream_count
= substream_count
;
613 if (substream_count
> 0) {
614 err
= snd_pcm_stream_proc_init(pstr
);
616 snd_printk(KERN_ERR
"Error in snd_pcm_stream_proc_init\n");
621 for (idx
= 0, prev
= NULL
; idx
< substream_count
; idx
++) {
622 substream
= kzalloc(sizeof(*substream
), GFP_KERNEL
);
623 if (substream
== NULL
) {
624 snd_printk(KERN_ERR
"Cannot allocate PCM substream\n");
627 substream
->pcm
= pcm
;
628 substream
->pstr
= pstr
;
629 substream
->number
= idx
;
630 substream
->stream
= stream
;
631 sprintf(substream
->name
, "subdevice #%i", idx
);
632 snprintf(substream
->latency_id
, sizeof(substream
->latency_id
),
633 "ALSA-PCM%d-%d%c%d", pcm
->card
->number
, pcm
->device
,
634 (stream
? 'c' : 'p'), idx
);
635 substream
->buffer_bytes_max
= UINT_MAX
;
637 pstr
->substream
= substream
;
639 prev
->next
= substream
;
640 err
= snd_pcm_substream_proc_init(substream
);
642 snd_printk(KERN_ERR
"Error in snd_pcm_stream_proc_init\n");
644 pstr
->substream
= NULL
;
650 substream
->group
= &substream
->self_group
;
651 spin_lock_init(&substream
->self_group
.lock
);
652 INIT_LIST_HEAD(&substream
->self_group
.substreams
);
653 list_add_tail(&substream
->link_list
, &substream
->self_group
.substreams
);
654 spin_lock_init(&substream
->timer_lock
);
655 atomic_set(&substream
->mmap_count
, 0);
661 EXPORT_SYMBOL(snd_pcm_new_stream
);
664 * snd_pcm_new - create a new PCM instance
665 * @card: the card instance
667 * @device: the device index (zero based)
668 * @playback_count: the number of substreams for playback
669 * @capture_count: the number of substreams for capture
670 * @rpcm: the pointer to store the new pcm instance
672 * Creates a new PCM instance.
674 * The pcm operators have to be set afterwards to the new instance
675 * via snd_pcm_set_ops().
677 * Returns zero if successful, or a negative error code on failure.
679 int snd_pcm_new(struct snd_card
*card
, char *id
, int device
,
680 int playback_count
, int capture_count
,
681 struct snd_pcm
** rpcm
)
685 static struct snd_device_ops ops
= {
686 .dev_free
= snd_pcm_dev_free
,
687 .dev_register
= snd_pcm_dev_register
,
688 .dev_disconnect
= snd_pcm_dev_disconnect
,
691 snd_assert(rpcm
!= NULL
, return -EINVAL
);
693 snd_assert(card
!= NULL
, return -ENXIO
);
694 pcm
= kzalloc(sizeof(*pcm
), GFP_KERNEL
);
696 snd_printk(KERN_ERR
"Cannot allocate PCM\n");
700 pcm
->device
= device
;
702 strlcpy(pcm
->id
, id
, sizeof(pcm
->id
));
703 if ((err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_PLAYBACK
, playback_count
)) < 0) {
707 if ((err
= snd_pcm_new_stream(pcm
, SNDRV_PCM_STREAM_CAPTURE
, capture_count
)) < 0) {
711 mutex_init(&pcm
->open_mutex
);
712 init_waitqueue_head(&pcm
->open_wait
);
713 if ((err
= snd_device_new(card
, SNDRV_DEV_PCM
, pcm
, &ops
)) < 0) {
721 EXPORT_SYMBOL(snd_pcm_new
);
723 static void snd_pcm_free_stream(struct snd_pcm_str
* pstr
)
725 struct snd_pcm_substream
*substream
, *substream_next
;
726 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
727 struct snd_pcm_oss_setup
*setup
, *setupn
;
729 substream
= pstr
->substream
;
731 substream_next
= substream
->next
;
732 snd_pcm_timer_done(substream
);
733 snd_pcm_substream_proc_done(substream
);
735 substream
= substream_next
;
737 snd_pcm_stream_proc_done(pstr
);
738 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
739 for (setup
= pstr
->oss
.setup_list
; setup
; setup
= setupn
) {
740 setupn
= setup
->next
;
741 kfree(setup
->task_name
);
747 static int snd_pcm_free(struct snd_pcm
*pcm
)
749 struct snd_pcm_notify
*notify
;
751 snd_assert(pcm
!= NULL
, return -ENXIO
);
752 list_for_each_entry(notify
, &snd_pcm_notify_list
, list
) {
753 notify
->n_unregister(pcm
);
755 if (pcm
->private_free
)
756 pcm
->private_free(pcm
);
757 snd_pcm_lib_preallocate_free_for_all(pcm
);
758 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
]);
759 snd_pcm_free_stream(&pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
]);
764 static int snd_pcm_dev_free(struct snd_device
*device
)
766 struct snd_pcm
*pcm
= device
->device_data
;
767 return snd_pcm_free(pcm
);
770 static void snd_pcm_tick_timer_func(unsigned long data
)
772 struct snd_pcm_substream
*substream
= (struct snd_pcm_substream
*) data
;
773 snd_pcm_tick_elapsed(substream
);
776 int snd_pcm_attach_substream(struct snd_pcm
*pcm
, int stream
,
778 struct snd_pcm_substream
**rsubstream
)
780 struct snd_pcm_str
* pstr
;
781 struct snd_pcm_substream
*substream
;
782 struct snd_pcm_runtime
*runtime
;
783 struct snd_ctl_file
*kctl
;
784 struct snd_card
*card
;
785 struct list_head
*list
;
786 int prefer_subdevice
= -1;
789 snd_assert(rsubstream
!= NULL
, return -EINVAL
);
791 snd_assert(pcm
!= NULL
, return -ENXIO
);
792 pstr
= &pcm
->streams
[stream
];
793 if (pstr
->substream
== NULL
|| pstr
->substream_count
== 0)
797 down_read(&card
->controls_rwsem
);
798 list_for_each(list
, &card
->ctl_files
) {
799 kctl
= snd_ctl_file(list
);
800 if (kctl
->pid
== current
->pid
) {
801 prefer_subdevice
= kctl
->prefer_pcm_subdevice
;
802 if (prefer_subdevice
!= -1)
806 up_read(&card
->controls_rwsem
);
809 case SNDRV_PCM_STREAM_PLAYBACK
:
810 if (pcm
->info_flags
& SNDRV_PCM_INFO_HALF_DUPLEX
) {
811 for (substream
= pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream
; substream
; substream
= substream
->next
) {
812 if (SUBSTREAM_BUSY(substream
))
817 case SNDRV_PCM_STREAM_CAPTURE
:
818 if (pcm
->info_flags
& SNDRV_PCM_INFO_HALF_DUPLEX
) {
819 for (substream
= pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream
; substream
; substream
= substream
->next
) {
820 if (SUBSTREAM_BUSY(substream
))
829 if (file
->f_flags
& O_APPEND
) {
830 if (prefer_subdevice
< 0) {
831 if (pstr
->substream_count
> 1)
832 return -EINVAL
; /* must be unique */
833 substream
= pstr
->substream
;
835 for (substream
= pstr
->substream
; substream
;
836 substream
= substream
->next
)
837 if (substream
->number
== prefer_subdevice
)
842 if (! SUBSTREAM_BUSY(substream
))
844 substream
->ref_count
++;
845 *rsubstream
= substream
;
849 if (prefer_subdevice
>= 0) {
850 for (substream
= pstr
->substream
; substream
; substream
= substream
->next
)
851 if (!SUBSTREAM_BUSY(substream
) && substream
->number
== prefer_subdevice
)
854 for (substream
= pstr
->substream
; substream
; substream
= substream
->next
)
855 if (!SUBSTREAM_BUSY(substream
))
858 if (substream
== NULL
)
861 runtime
= kzalloc(sizeof(*runtime
), GFP_KERNEL
);
865 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
));
866 runtime
->status
= snd_malloc_pages(size
, GFP_KERNEL
);
867 if (runtime
->status
== NULL
) {
871 memset((void*)runtime
->status
, 0, size
);
873 size
= PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
));
874 runtime
->control
= snd_malloc_pages(size
, GFP_KERNEL
);
875 if (runtime
->control
== NULL
) {
876 snd_free_pages((void*)runtime
->status
,
877 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
881 memset((void*)runtime
->control
, 0, size
);
883 init_waitqueue_head(&runtime
->sleep
);
884 init_timer(&runtime
->tick_timer
);
885 runtime
->tick_timer
.function
= snd_pcm_tick_timer_func
;
886 runtime
->tick_timer
.data
= (unsigned long) substream
;
888 runtime
->status
->state
= SNDRV_PCM_STATE_OPEN
;
890 substream
->runtime
= runtime
;
891 substream
->private_data
= pcm
->private_data
;
892 substream
->ref_count
= 1;
893 substream
->f_flags
= file
->f_flags
;
894 pstr
->substream_opened
++;
895 *rsubstream
= substream
;
899 void snd_pcm_detach_substream(struct snd_pcm_substream
*substream
)
901 struct snd_pcm_runtime
*runtime
;
903 runtime
= substream
->runtime
;
904 snd_assert(runtime
!= NULL
, return);
905 if (runtime
->private_free
!= NULL
)
906 runtime
->private_free(runtime
);
907 snd_free_pages((void*)runtime
->status
,
908 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status
)));
909 snd_free_pages((void*)runtime
->control
,
910 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control
)));
911 kfree(runtime
->hw_constraints
.rules
);
913 substream
->runtime
= NULL
;
914 substream
->pstr
->substream_opened
--;
917 static ssize_t
show_pcm_class(struct device
*dev
,
918 struct device_attribute
*attr
, char *buf
)
922 static const char *strs
[SNDRV_PCM_CLASS_LAST
+ 1] = {
923 [SNDRV_PCM_CLASS_GENERIC
] = "generic",
924 [SNDRV_PCM_CLASS_MULTI
] = "multi",
925 [SNDRV_PCM_CLASS_MODEM
] = "modem",
926 [SNDRV_PCM_CLASS_DIGITIZER
] = "digitizer",
929 if (! (pcm
= dev_get_drvdata(dev
)) ||
930 pcm
->dev_class
> SNDRV_PCM_CLASS_LAST
)
933 str
= strs
[pcm
->dev_class
];
934 return snprintf(buf
, PAGE_SIZE
, "%s\n", str
);
937 static struct device_attribute pcm_attrs
=
938 __ATTR(pcm_class
, S_IRUGO
, show_pcm_class
, NULL
);
940 static int snd_pcm_dev_register(struct snd_device
*device
)
943 struct snd_pcm_substream
*substream
;
944 struct list_head
*list
;
946 struct snd_pcm
*pcm
= device
->device_data
;
948 snd_assert(pcm
!= NULL
&& device
!= NULL
, return -ENXIO
);
949 mutex_lock(®ister_mutex
);
950 if (snd_pcm_search(pcm
->card
, pcm
->device
)) {
951 mutex_unlock(®ister_mutex
);
954 list_add_tail(&pcm
->list
, &snd_pcm_devices
);
955 for (cidx
= 0; cidx
< 2; cidx
++) {
957 if (pcm
->streams
[cidx
].substream
== NULL
)
960 case SNDRV_PCM_STREAM_PLAYBACK
:
961 sprintf(str
, "pcmC%iD%ip", pcm
->card
->number
, pcm
->device
);
962 devtype
= SNDRV_DEVICE_TYPE_PCM_PLAYBACK
;
964 case SNDRV_PCM_STREAM_CAPTURE
:
965 sprintf(str
, "pcmC%iD%ic", pcm
->card
->number
, pcm
->device
);
966 devtype
= SNDRV_DEVICE_TYPE_PCM_CAPTURE
;
969 if ((err
= snd_register_device(devtype
, pcm
->card
,
971 &snd_pcm_f_ops
[cidx
],
974 list_del(&pcm
->list
);
975 mutex_unlock(®ister_mutex
);
978 snd_add_device_sysfs_file(devtype
, pcm
->card
, pcm
->device
,
980 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
)
981 snd_pcm_timer_init(substream
);
983 list_for_each(list
, &snd_pcm_notify_list
) {
984 struct snd_pcm_notify
*notify
;
985 notify
= list_entry(list
, struct snd_pcm_notify
, list
);
986 notify
->n_register(pcm
);
988 mutex_unlock(®ister_mutex
);
992 static int snd_pcm_dev_disconnect(struct snd_device
*device
)
994 struct snd_pcm
*pcm
= device
->device_data
;
995 struct snd_pcm_notify
*notify
;
996 struct snd_pcm_substream
*substream
;
999 mutex_lock(®ister_mutex
);
1000 if (list_empty(&pcm
->list
))
1003 list_del_init(&pcm
->list
);
1004 for (cidx
= 0; cidx
< 2; cidx
++)
1005 for (substream
= pcm
->streams
[cidx
].substream
; substream
; substream
= substream
->next
)
1006 if (substream
->runtime
)
1007 substream
->runtime
->status
->state
= SNDRV_PCM_STATE_DISCONNECTED
;
1008 list_for_each_entry(notify
, &snd_pcm_notify_list
, list
) {
1009 notify
->n_disconnect(pcm
);
1011 for (cidx
= 0; cidx
< 2; cidx
++) {
1014 case SNDRV_PCM_STREAM_PLAYBACK
:
1015 devtype
= SNDRV_DEVICE_TYPE_PCM_PLAYBACK
;
1017 case SNDRV_PCM_STREAM_CAPTURE
:
1018 devtype
= SNDRV_DEVICE_TYPE_PCM_CAPTURE
;
1021 snd_unregister_device(devtype
, pcm
->card
, pcm
->device
);
1024 mutex_unlock(®ister_mutex
);
1028 int snd_pcm_notify(struct snd_pcm_notify
*notify
, int nfree
)
1030 struct list_head
*p
;
1032 snd_assert(notify
!= NULL
&&
1033 notify
->n_register
!= NULL
&&
1034 notify
->n_unregister
!= NULL
&&
1035 notify
->n_disconnect
, return -EINVAL
);
1036 mutex_lock(®ister_mutex
);
1038 list_del(¬ify
->list
);
1039 list_for_each(p
, &snd_pcm_devices
)
1040 notify
->n_unregister(list_entry(p
,
1041 struct snd_pcm
, list
));
1043 list_add_tail(¬ify
->list
, &snd_pcm_notify_list
);
1044 list_for_each(p
, &snd_pcm_devices
)
1045 notify
->n_register(list_entry(p
, struct snd_pcm
, list
));
1047 mutex_unlock(®ister_mutex
);
1051 EXPORT_SYMBOL(snd_pcm_notify
);
1053 #ifdef CONFIG_PROC_FS
1058 static void snd_pcm_proc_read(struct snd_info_entry
*entry
,
1059 struct snd_info_buffer
*buffer
)
1061 struct list_head
*p
;
1062 struct snd_pcm
*pcm
;
1064 mutex_lock(®ister_mutex
);
1065 list_for_each(p
, &snd_pcm_devices
) {
1066 pcm
= list_entry(p
, struct snd_pcm
, list
);
1067 snd_iprintf(buffer
, "%02i-%02i: %s : %s",
1068 pcm
->card
->number
, pcm
->device
, pcm
->id
, pcm
->name
);
1069 if (pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream
)
1070 snd_iprintf(buffer
, " : playback %i",
1071 pcm
->streams
[SNDRV_PCM_STREAM_PLAYBACK
].substream_count
);
1072 if (pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream
)
1073 snd_iprintf(buffer
, " : capture %i",
1074 pcm
->streams
[SNDRV_PCM_STREAM_CAPTURE
].substream_count
);
1075 snd_iprintf(buffer
, "\n");
1077 mutex_unlock(®ister_mutex
);
1080 static struct snd_info_entry
*snd_pcm_proc_entry
;
1082 static void snd_pcm_proc_init(void)
1084 struct snd_info_entry
*entry
;
1086 if ((entry
= snd_info_create_module_entry(THIS_MODULE
, "pcm", NULL
)) != NULL
) {
1087 snd_info_set_text_ops(entry
, NULL
, snd_pcm_proc_read
);
1088 if (snd_info_register(entry
) < 0) {
1089 snd_info_free_entry(entry
);
1093 snd_pcm_proc_entry
= entry
;
1096 static void snd_pcm_proc_done(void)
1098 snd_info_free_entry(snd_pcm_proc_entry
);
1101 #else /* !CONFIG_PROC_FS */
1102 #define snd_pcm_proc_init()
1103 #define snd_pcm_proc_done()
1104 #endif /* CONFIG_PROC_FS */
1111 static int __init
alsa_pcm_init(void)
1113 snd_ctl_register_ioctl(snd_pcm_control_ioctl
);
1114 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl
);
1115 snd_pcm_proc_init();
1119 static void __exit
alsa_pcm_exit(void)
1121 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl
);
1122 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl
);
1123 snd_pcm_proc_done();
1126 module_init(alsa_pcm_init
)
1127 module_exit(alsa_pcm_exit
)