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Commit 83e72dd9 authored by Seth Forshee's avatar Seth Forshee Committed by Matthew Garrett
Browse files

apple_bl: Add register/unregister functions 



Add functions to allow other modules to enable or disable apple_bl. This
will be used by the gmux driver to disable apple_bl when the gmux is
present, as it is a better and more reliable option for brightness
control.

Signed-off-by: default avatarSeth Forshee <seth.forshee@canonical.com>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent f11f999e

drivers/video/backlight/apple_bl.c

+21 −2
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/io.h>

#include <linux/pci.h>

#include <linux/acpi.h>

#include <linux/atomic.h>



static struct backlight_device *apple_backlight_device;
@@ -221,15 +222,33 @@ static struct acpi_driver apple_bl_driver = { 
	},

};



static int __init apple_bl_init(void)

static atomic_t apple_bl_registered = ATOMIC_INIT(0);



int apple_bl_register(void)

{

	if (atomic_xchg(&apple_bl_registered, 1) == 0)

		return acpi_bus_register_driver(&apple_bl_driver);



	return 0;

}

EXPORT_SYMBOL_GPL(apple_bl_register);



static void __exit apple_bl_exit(void)

void apple_bl_unregister(void)

{

	if (atomic_xchg(&apple_bl_registered, 0) == 1)

		acpi_bus_unregister_driver(&apple_bl_driver);

}

EXPORT_SYMBOL_GPL(apple_bl_unregister);



static int __init apple_bl_init(void)

{

	return apple_bl_register();

}



static void __exit apple_bl_exit(void)

{

	apple_bl_unregister();

}



module_init(apple_bl_init);

module_exit(apple_bl_exit);

include/linux/apple_bl.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * apple_bl exported symbols

 */



#ifndef _LINUX_APPLE_BL_H

#define _LINUX_APPLE_BL_H



#ifdef CONFIG_BACKLIGHT_APPLE



extern int apple_bl_register(void);

extern void apple_bl_unregister(void);



#else /* !CONFIG_BACKLIGHT_APPLE */



static inline int apple_bl_register(void)

{

	return 0;

}



static inline void apple_bl_unregister(void)

{

}



#endif /* !CONFIG_BACKLIGHT_APPLE */



#endif /* _LINUX_APPLE_BL_H */