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/*
* LCD Lowlevel Control Abstraction
*
* Copyright (C) 2003,2004 Hewlett-Packard Company
*
*/
#ifndef _LINUX_LCD_H
#define _LINUX_LCD_H
#include <linux/device.h>
#include <linux/notifier.h>
struct lcd_device;
struct fb_info;
/* This structure defines all the properties of a LCD flat panel. */
struct lcd_properties {
/* Get the LCD panel power status (0: full on, 1..3: controller
power on, flat panel power off, 4: full off), see FB_BLANK_XXX */
int (*get_power)(struct lcd_device *);
/* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
int (*set_power)(struct lcd_device *, int power);
/* The maximum value for contrast (read-only) */
int max_contrast;
/* Get the current contrast setting (0-max_contrast) */
int (*get_contrast)(struct lcd_device *);
/* Set LCD panel contrast */
int (*set_contrast)(struct lcd_device *, int contrast);
/* Check if given framebuffer device is the one LCD is bound to;
return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */
int (*check_fb)(struct fb_info *);
};
struct lcd_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 lcd_properties *props;
/* The framebuffer notifier block */
struct notifier_block fb_notif;
/* The class device structure */
struct class_device class_dev;
};
extern struct lcd_device *lcd_device_register(const char *name,
void *devdata, struct lcd_properties *lp);
extern void lcd_device_unregister(struct lcd_device *ld);
#define to_lcd_device(obj) container_of(obj, struct lcd_device, class_dev)
#endif
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