1 /* 2 * LCD Lowlevel Control Abstraction 3 * 4 * Copyright (C) 2003,2004 Hewlett-Packard Company 5 * 6 */ 7 8 #ifndef _LINUX_LCD_H 9 #define _LINUX_LCD_H 10 11 #include <linux/device.h> 12 #include <linux/notifier.h> 13 14 struct lcd_device; 15 struct fb_info; 16 17 /* This structure defines all the properties of a LCD flat panel. */ 18 struct lcd_properties { 19 /* Owner module */ 20 struct module *owner; 21 /* Get the LCD panel power status (0: full on, 1..3: controller 22 power on, flat panel power off, 4: full off), see FB_BLANK_XXX */ 23 int (*get_power)(struct lcd_device *); 24 /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ 25 int (*set_power)(struct lcd_device *, int power); 26 /* The maximum value for contrast (read-only) */ 27 int max_contrast; 28 /* Get the current contrast setting (0-max_contrast) */ 29 int (*get_contrast)(struct lcd_device *); 30 /* Set LCD panel contrast */ 31 int (*set_contrast)(struct lcd_device *, int contrast); 32 /* Check if given framebuffer device is the one LCD is bound to; 33 return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */ 34 int (*check_fb)(struct fb_info *); 35 }; 36 37 struct lcd_device { 38 /* This protects the 'props' field. If 'props' is NULL, the driver that 39 registered this device has been unloaded, and if class_get_devdata() 40 points to something in the body of that driver, it is also invalid. */ 41 struct semaphore sem; 42 /* If this is NULL, the backing module is unloaded */ 43 struct lcd_properties *props; 44 /* The framebuffer notifier block */ 45 struct notifier_block fb_notif; 46 /* The class device structure */ 47 struct class_device class_dev; 48 }; 49 50 extern struct lcd_device *lcd_device_register(const char *name, 51 void *devdata, struct lcd_properties *lp); 52 extern void lcd_device_unregister(struct lcd_device *ld); 53 54 #define to_lcd_device(obj) container_of(obj, struct lcd_device, class_dev) 55 56 #endif 57