linux/sound/core/sound_oss.c
Takashi Iwai b046d244e2 ALSA: core: Remove superfluous exit calls for proc entries
Since each proc entry is freed automatically by the parent, we don't
have to take care of its life cycle any longer.  This allows us to
reduce a few more lines of codes.

Acked-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-04-24 17:31:04 +02:00

273 lines
7.3 KiB
C

/*
* Advanced Linux Sound Architecture
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifdef CONFIG_SND_OSSEMUL
#if !IS_ENABLED(CONFIG_SOUND)
#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
#endif
#include <linux/init.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <linux/sound.h>
#include <linux/mutex.h>
#define SNDRV_OSS_MINORS 256
static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
static DEFINE_MUTEX(sound_oss_mutex);
/* NOTE: This function increments the refcount of the associated card like
* snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
*/
void *snd_lookup_oss_minor_data(unsigned int minor, int type)
{
struct snd_minor *mreg;
void *private_data;
if (minor >= ARRAY_SIZE(snd_oss_minors))
return NULL;
mutex_lock(&sound_oss_mutex);
mreg = snd_oss_minors[minor];
if (mreg && mreg->type == type) {
private_data = mreg->private_data;
if (private_data && mreg->card_ptr)
get_device(&mreg->card_ptr->card_dev);
} else
private_data = NULL;
mutex_unlock(&sound_oss_mutex);
return private_data;
}
EXPORT_SYMBOL(snd_lookup_oss_minor_data);
static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
{
int minor;
switch (type) {
case SNDRV_OSS_DEVICE_TYPE_MIXER:
if (snd_BUG_ON(!card || dev < 0 || dev > 1))
return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
break;
case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
minor = SNDRV_MINOR_OSS_SEQUENCER;
break;
case SNDRV_OSS_DEVICE_TYPE_MUSIC:
minor = SNDRV_MINOR_OSS_MUSIC;
break;
case SNDRV_OSS_DEVICE_TYPE_PCM:
if (snd_BUG_ON(!card || dev < 0 || dev > 1))
return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
break;
case SNDRV_OSS_DEVICE_TYPE_MIDI:
if (snd_BUG_ON(!card || dev < 0 || dev > 1))
return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
break;
case SNDRV_OSS_DEVICE_TYPE_DMFM:
minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
break;
case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
minor = SNDRV_MINOR_OSS_SNDSTAT;
break;
default:
return -EINVAL;
}
if (minor < 0 || minor >= SNDRV_OSS_MINORS)
return -EINVAL;
return minor;
}
int snd_register_oss_device(int type, struct snd_card *card, int dev,
const struct file_operations *f_ops, void *private_data)
{
int minor = snd_oss_kernel_minor(type, card, dev);
int minor_unit;
struct snd_minor *preg;
int cidx = SNDRV_MINOR_OSS_CARD(minor);
int track2 = -1;
int register1 = -1, register2 = -1;
struct device *carddev = snd_card_get_device_link(card);
if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
return 0; /* ignore silently */
if (minor < 0)
return minor;
preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
if (preg == NULL)
return -ENOMEM;
preg->type = type;
preg->card = card ? card->number : -1;
preg->device = dev;
preg->f_ops = f_ops;
preg->private_data = private_data;
preg->card_ptr = card;
mutex_lock(&sound_oss_mutex);
snd_oss_minors[minor] = preg;
minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
switch (minor_unit) {
case SNDRV_MINOR_OSS_PCM:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
break;
case SNDRV_MINOR_OSS_MIDI:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
break;
case SNDRV_MINOR_OSS_MIDI1:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
break;
}
register1 = register_sound_special_device(f_ops, minor, carddev);
if (register1 != minor)
goto __end;
if (track2 >= 0) {
register2 = register_sound_special_device(f_ops, track2,
carddev);
if (register2 != track2)
goto __end;
snd_oss_minors[track2] = preg;
}
mutex_unlock(&sound_oss_mutex);
return 0;
__end:
if (register2 >= 0)
unregister_sound_special(register2);
if (register1 >= 0)
unregister_sound_special(register1);
snd_oss_minors[minor] = NULL;
mutex_unlock(&sound_oss_mutex);
kfree(preg);
return -EBUSY;
}
EXPORT_SYMBOL(snd_register_oss_device);
int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
{
int minor = snd_oss_kernel_minor(type, card, dev);
int cidx = SNDRV_MINOR_OSS_CARD(minor);
int track2 = -1;
struct snd_minor *mptr;
if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
return 0;
if (minor < 0)
return minor;
mutex_lock(&sound_oss_mutex);
mptr = snd_oss_minors[minor];
if (mptr == NULL) {
mutex_unlock(&sound_oss_mutex);
return -ENOENT;
}
unregister_sound_special(minor);
switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
case SNDRV_MINOR_OSS_PCM:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
break;
case SNDRV_MINOR_OSS_MIDI:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
break;
case SNDRV_MINOR_OSS_MIDI1:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
break;
}
if (track2 >= 0) {
unregister_sound_special(track2);
snd_oss_minors[track2] = NULL;
}
snd_oss_minors[minor] = NULL;
mutex_unlock(&sound_oss_mutex);
kfree(mptr);
return 0;
}
EXPORT_SYMBOL(snd_unregister_oss_device);
/*
* INFO PART
*/
#ifdef CONFIG_PROC_FS
static const char *snd_oss_device_type_name(int type)
{
switch (type) {
case SNDRV_OSS_DEVICE_TYPE_MIXER:
return "mixer";
case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
case SNDRV_OSS_DEVICE_TYPE_MUSIC:
return "sequencer";
case SNDRV_OSS_DEVICE_TYPE_PCM:
return "digital audio";
case SNDRV_OSS_DEVICE_TYPE_MIDI:
return "raw midi";
case SNDRV_OSS_DEVICE_TYPE_DMFM:
return "hardware dependent";
default:
return "?";
}
}
static void snd_minor_info_oss_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
int minor;
struct snd_minor *mptr;
mutex_lock(&sound_oss_mutex);
for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
if (!(mptr = snd_oss_minors[minor]))
continue;
if (mptr->card >= 0)
snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
mptr->card, mptr->device,
snd_oss_device_type_name(mptr->type));
else
snd_iprintf(buffer, "%3i: : %s\n", minor,
snd_oss_device_type_name(mptr->type));
}
mutex_unlock(&sound_oss_mutex);
}
int __init snd_minor_info_oss_init(void)
{
struct snd_info_entry *entry;
entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
if (entry) {
entry->c.text.read = snd_minor_info_oss_read;
if (snd_info_register(entry) < 0)
snd_info_free_entry(entry);
}
return 0;
}
#endif /* CONFIG_PROC_FS */
#endif /* CONFIG_SND_OSSEMUL */