apple_bl: Add register/unregister functions (83e72dd9) · Commits · 戴 / test

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);

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 */