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