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/*
* libbacklight - userspace interface to Linux backlight control
*
* Copyright © 2012 Intel Corporation
* Copyright 2010 Red Hat <mjg@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Matthew Garrett <mjg@redhat.com>
* Tiago Vignatti <vignatti@freedesktop.org>
*/
#ifndef LIBBACKLIGHT_H
#define LIBBACKLIGHT_H
#include <libudev.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
enum backlight_type {
BACKLIGHT_RAW,
BACKLIGHT_PLATFORM,
BACKLIGHT_FIRMWARE
};
struct backlight {
char *path;
int max_brightness;
int brightness;
enum backlight_type type;
};
/*
* Find and set up a backlight for a valid udev connector device, i.e. one
* matching drm subsytem and with status of connected.
*/
struct backlight *backlight_init(struct udev_device *drm_device,
uint32_t connector_type);
/* Free backlight resources */
void backlight_destroy(struct backlight *backlight);
/* Provide the maximum backlight value */
long backlight_get_max_brightness(struct backlight *backlight);
/* Provide the cached backlight value */
long backlight_get_brightness(struct backlight *backlight);
/* Provide the hardware backlight value */
long backlight_get_actual_brightness(struct backlight *backlight);
/* Set the backlight to a value between 0 and max */
long backlight_set_brightness(struct backlight *backlight, long brightness);
#ifdef __cplusplus
}
#endif
#endif /* LIBBACKLIGHT_H */
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