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