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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
14struct lcd_device;
15struct fb_info;
16
17/* This structure defines all the properties of a LCD flat panel. */
18struct 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
37struct 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
50extern struct lcd_device *lcd_device_register(const char *name,
51 void *devdata, struct lcd_properties *lp);
52extern 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