lcd.h
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上传日期:2009-04-28
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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 {
- /* Owner module */
- struct module *owner;
- /* 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