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58 lines
1.9 KiB
58 lines
1.9 KiB
20 years ago
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/*
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* Backlight 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_BACKLIGHT_H
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#define _LINUX_BACKLIGHT_H
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#include <linux/device.h>
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#include <linux/notifier.h>
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struct backlight_device;
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struct fb_info;
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/* This structure defines all the properties of a backlight
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(usually attached to a LCD). */
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struct backlight_properties {
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/* Owner module */
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struct module *owner;
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/* Get the backlight power status (0: full on, 1..3: power saving
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modes; 4: full off), see FB_BLANK_XXX */
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int (*get_power)(struct backlight_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 backlight_device *, int power);
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/* Maximal value for brightness (read-only) */
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int max_brightness;
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/* Get current backlight brightness */
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int (*get_brightness)(struct backlight_device *);
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/* Set backlight brightness (0..max_brightness) */
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int (*set_brightness)(struct backlight_device *, int brightness);
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/* Check if given framebuffer device is the one bound to this backlight;
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return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
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int (*check_fb)(struct fb_info *);
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};
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struct backlight_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 backlight_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 backlight_device *backlight_device_register(const char *name,
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void *devdata, struct backlight_properties *bp);
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extern void backlight_device_unregister(struct backlight_device *bd);
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#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)
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#endif
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