58 строки
1.9 KiB
C
58 строки
1.9 KiB
C
/*
|
|
* Backlight Lowlevel Control Abstraction
|
|
*
|
|
* Copyright (C) 2003,2004 Hewlett-Packard Company
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_BACKLIGHT_H
|
|
#define _LINUX_BACKLIGHT_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/notifier.h>
|
|
|
|
struct backlight_device;
|
|
struct fb_info;
|
|
|
|
/* This structure defines all the properties of a backlight
|
|
(usually attached to a LCD). */
|
|
struct backlight_properties {
|
|
/* Owner module */
|
|
struct module *owner;
|
|
/* Get the backlight power status (0: full on, 1..3: power saving
|
|
modes; 4: full off), see FB_BLANK_XXX */
|
|
int (*get_power)(struct backlight_device *);
|
|
/* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
|
|
int (*set_power)(struct backlight_device *, int power);
|
|
/* Maximal value for brightness (read-only) */
|
|
int max_brightness;
|
|
/* Get current backlight brightness */
|
|
int (*get_brightness)(struct backlight_device *);
|
|
/* Set backlight brightness (0..max_brightness) */
|
|
int (*set_brightness)(struct backlight_device *, int brightness);
|
|
/* Check if given framebuffer device is the one bound to this backlight;
|
|
return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
|
|
int (*check_fb)(struct fb_info *);
|
|
};
|
|
|
|
struct backlight_device {
|
|
/* This protects the 'props' field. If 'props' is NULL, the driver that
|
|
registered this device has been unloaded, and if class_get_devdata()
|
|
points to something in the body of that driver, it is also invalid. */
|
|
struct semaphore sem;
|
|
/* If this is NULL, the backing module is unloaded */
|
|
struct backlight_properties *props;
|
|
/* The framebuffer notifier block */
|
|
struct notifier_block fb_notif;
|
|
/* The class device structure */
|
|
struct class_device class_dev;
|
|
};
|
|
|
|
extern struct backlight_device *backlight_device_register(const char *name,
|
|
void *devdata, struct backlight_properties *bp);
|
|
extern void backlight_device_unregister(struct backlight_device *bd);
|
|
|
|
#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)
|
|
|
|
#endif
|