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