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