60 lines
2.0 KiB
Java
60 lines
2.0 KiB
Java
/*
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* Copyright (C) 2013-2016 The CyanogenMod Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.lineageos.hardware;
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import org.lineageos.internal.util.FileUtils;
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/**
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* Adaptive backlight support (this refers to technologies like NVIDIA SmartDimmer,
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* QCOM CABL or Samsung CABC).
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*/
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public class AdaptiveBacklight {
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private static final String FILE_CABC = "/sys/class/lcd/panel/power_reduce";
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/**
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* Whether device supports an adaptive backlight technology.
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*
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* @return boolean Supported devices must return always true
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*/
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public static boolean isSupported() {
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return FileUtils.isFileWritable(FILE_CABC) &&
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FileUtils.isFileReadable(FILE_CABC);
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}
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/**
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* This method return the current activation status of the adaptive backlight technology.
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*
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* @return boolean Must be false when adaptive backlight is not supported or not activated, or
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* the operation failed while reading the status; true in any other case.
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*/
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public static boolean isEnabled() {
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return "1".equals(FileUtils.readOneLine(FILE_CABC));
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}
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/**
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* This method allows to setup adaptive backlight technology status.
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*
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* @param status The new adaptive backlight status
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* @return boolean Must be false if adaptive backlight is not supported or the operation
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* failed; true in any other case.
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*/
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public static boolean setEnabled(boolean status) {
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return FileUtils.writeLine(FILE_CABC, status ? "1" : "0");
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}
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}
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