soundcore.c File Reference

Linux DDE Soundcore. More...

#include <l4/env/errno.h>
#include <l4/lock/lock.h>
#include <l4/dde_linux/dde.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include "__config.h"
#include "internal.h"
#include "soundcore.h"

Go to the source code of this file.

Classes
struct	sound_unit
	internal sound device/unit structure More...
Functions
int	__sound_insert_unit (struct sound_unit *s, struct sound_unit **list, struct file_operations *fops)
	Low level list operator.
void	__sound_remove_unit (struct sound_unit **list, int unit)
	Remove a node from the chain.
sound_unit *	__look_for_unit (struct sound_unit *s, int unit)
	look
int	sound_insert_unit (struct sound_unit **list, struct file_operations *fops, const char *name, int type)
	Insert a unit.
void	sound_remove_unit (struct sound_unit **list, int unit)
	Remove a unit.
int	register_sound_dsp (struct file_operations *fops, int dev)
	Register a DSP Device.
int	register_sound_mixer (struct file_operations *fops, int dev)
	Register a Mixer Device.
int	register_sound_midi (struct file_operations *fops, int dev)
	Register a MIDI Device.
int	register_sound_special (struct file_operations *fops, int unit)
	Register a Special Sound Node.
int	register_sound_synth (struct file_operations *fops, int dev)
	Register a synth Device.
void	unregister_sound_dsp (int unit)
	Unregister a DSP Device.
void	unregister_sound_mixer (int unit)
	Unregister a Mixer Device.
void	unregister_sound_midi (int unit)
	Unregister a MIDI Device.
void	unregister_sound_special (int unit)
	Unregister a Special Node.
void	unregister_sound_synth (int unit)
	Unregister a synth Device.
file_operations *	soundcore_req_fops (int type, int num)
	Query for device operations structure.
void	soundcore_rel_fops (int type, int num)
	Release DSP/PCM device XXX nothing to do ?
Variables
sound_unit *	dsp = NULL *mixer = NULL
	internal lists of sound units
l4lock_t	sound_loader_lock = L4LOCK_UNLOCKED
	initilization lock

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Detailed Description

Linux DDE Soundcore.

Date:

08/28/2003

Author:

Christian Helmuth <ch12@os.inf.tu-dresden.de>

Definition in file soundcore.c.

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Function Documentation

int __sound_insert_unit (  struct sound_unit *  s, struct sound_unit **  list, struct file_operations *  fops )  [static]

Low level list operator. Scan the ordered list, find a hole and join into it. Called with the lock asserted. Test: krishna: It differs from Linux as we use n as device number (not as minor number). Definition at line 60 of file soundcore.c. References sound_unit::fops, sound_unit::next, sound_unit::num, and NUM_MAX. Referenced by sound_insert_unit().

void __sound_remove_unit (  struct sound_unit **  list, int  unit )  [static]

Remove a node from the chain. Called with the lock asserted Definition at line 95 of file soundcore.c. References sound_unit::next, and vfree(). Referenced by sound_remove_unit().

int sound_insert_unit (  struct sound_unit **  list, struct file_operations *  fops, const char *  name, int  type )  [static]

Insert a unit. Allocate the controlling structure and add it to the sound driver list. Acquires locks as needed Definition at line 127 of file soundcore.c. References __sound_insert_unit(), sound_loader_lock, vfree(), and vmalloc(). Referenced by register_sound_dsp(), register_sound_midi(), and register_sound_mixer().

void sound_remove_unit (  struct sound_unit **  list, int  unit )  [static]

Remove a unit. Acquires locks as needed. The drivers MUST have completed the removal before their file operations become invalid. Definition at line 152 of file soundcore.c. References __look_for_unit(), __sound_remove_unit(), and sound_loader_lock. Referenced by unregister_sound_dsp(), unregister_sound_midi(), and unregister_sound_mixer().

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