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sound: make OSS sound core optional

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sound/sound_core.c implements soundcore.ko and contains two parts -
sound_class which is shared by both ALSA and OSS and device
redirection support for OSS.  It's always compiled when any sound
support is enabled although it's necessary only when OSS (the actual
one or emulation) is enabled.  This is slightly wasteful and as device
redirection always registers character device region for major 14, it
prevents alternative implementation.

This patch introduces a new config SOUND_OSS_CORE which is selected
iff OSS support is actually necessary and build the OSS core part
conditionally.

If OSS is disabled, soundcore merely contains sound_class but leaving
it that way seems to be the simplest approach as otherwise sound_class
should be in ALSA core file if OSS is disabled but should be in
soundcore if OSS is enabled.  Also, there's also the user confusion
factor.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Tejun Heo 2008-08-28 16:42:51 +02:00 committed by Jaroslav Kysela
parent 9f99a6386e
commit d886e87cb8
5 changed files with 71 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/um/Kconfig.char
View file

@ -203,6 +203,10 @@ config SOUND
tristate
default UML_SOUND
config SOUND_OSS_CORE
bool
default UML_SOUND
config HOSTAUDIO
tristate
default UML_SOUND

5
sound/Kconfig
View file

@ -28,6 +28,10 @@ menuconfig SOUND
if SOUND
config SOUND_OSS_CORE
bool
default n
source "sound/oss/dmasound/Kconfig"
if !M68K
@ -80,6 +84,7 @@ endif # SND
menuconfig SOUND_PRIME
tristate "Open Sound System (DEPRECATED)"
select SOUND_OSS_CORE
help
Say 'Y' or 'M' to enable Open Sound System drivers.

1
sound/core/Kconfig
View file

@ -44,6 +44,7 @@ config SND_SEQ_DUMMY
will be called snd-seq-dummy.
config SND_OSSEMUL
select SOUND_OSS_CORE
bool
config SND_MIXER_OSS

1
sound/oss/dmasound/Kconfig
View file

@ -42,3 +42,4 @@ config DMASOUND_Q40
config DMASOUND
tristate
select SOUND_OSS_CORE

79
sound/sound_core.c
View file

@ -1,5 +1,61 @@
/*
* Sound core handling. Breaks out sound functions to submodules
* Sound core. This file is composed of two parts. sound_class
* which is common to both OSS and ALSA and OSS sound core which
* is used OSS or emulation of it.
*/
/*
* First, the common part.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#ifdef CONFIG_SOUND_OSS_CORE
static int __init init_oss_soundcore(void);
static void __exit cleanup_oss_soundcore(void);
#else
static inline int init_oss_soundcore(void) { return 0; }
static inline void cleanup_oss_soundcore(void) { }
#endif
struct class *sound_class;
EXPORT_SYMBOL(sound_class);
MODULE_DESCRIPTION("Core sound module");
MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
static int __init init_soundcore(void)
{
int rc;
rc = init_oss_soundcore();
if (rc)
return rc;
sound_class = class_create(THIS_MODULE, "sound");
if (IS_ERR(sound_class)) {
cleanup_oss_soundcore();
return PTR_ERR(sound_class);
}
return 0;
}
static void __exit cleanup_soundcore(void)
{
cleanup_oss_soundcore();
class_destroy(sound_class);
}
module_init(init_soundcore);
module_exit(cleanup_soundcore);
#ifdef CONFIG_SOUND_OSS_CORE
/*
* OSS sound core handling. Breaks out sound functions to submodules
*
* Author: Alan Cox <alan.cox@linux.org>
*
@ -34,21 +90,17 @@
* locking at some point in 2.3.x.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sound.h>
#include <linux/major.h>
#include <linux/kmod.h>
#include <linux/device.h>
#define SOUND_STEP 16
struct sound_unit
{
int unit_minor;
@ -64,9 +116,6 @@ extern int msnd_classic_init(void);
extern int msnd_pinnacle_init(void);
#endif
struct class *sound_class;
EXPORT_SYMBOL(sound_class);
/*
* Low level list operator. Scan the ordered list, find a hole and
* join into it. Called with the lock asserted
@ -523,31 +572,23 @@ int soundcore_open(struct inode *inode, struct file *file)
return -ENODEV;
}
MODULE_DESCRIPTION("Core sound module");
MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR);
static void __exit cleanup_soundcore(void)
static void __exit cleanup_oss_soundcore(void)
{
/* We have nothing to really do here - we know the lists must be
empty */
unregister_chrdev(SOUND_MAJOR, "sound");
class_destroy(sound_class);
}
static int __init init_soundcore(void)
static int __init init_oss_soundcore(void)
{
if (register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops)==-1) {
printk(KERN_ERR "soundcore: sound device already in use.\n");
return -EBUSY;
}
sound_class = class_create(THIS_MODULE, "sound");
if (IS_ERR(sound_class))
return PTR_ERR(sound_class);
return 0;
}
module_init(init_soundcore);
module_exit(cleanup_soundcore);
#endif /* CONFIG_SOUND_OSS_CORE */