cmhw/org/cyanogenmod/hardware/TouchscreenHovering.java

/*
 * Copyright (C) 2015 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 org.cyanogenmod.hardware.util.FileUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import android.util.Log;

/**
 * Touchscreen Hovering
 */
public class TouchscreenHovering {

    private static String TAG = "TouchscreenHovering";

    private static String COMMAND_PATH = "/sys/class/sec/tsp/cmd";
    private static String COMMAND_LIST_PATH = "/sys/class/sec/tsp/cmd_list";
    private static String COMMAND_RESULT_PATH = "/sys/class/sec/tsp/cmd_result";
    private static String HOVER_MODE = "hover_enable";
    private static String HOVER_MODE_ENABLE = "hover_enable,1";
    private static String HOVER_MODE_DISABLE = "hover_enable,0";
    private static String STATUS_OK = ":OK";

    /**
     * Whether device supports touchscreen hovering.
     *
     * @return boolean Supported devices must return always true
     */
    public static boolean isSupported() {
        File f = new File(COMMAND_PATH);
        if (f.exists()) {
            BufferedReader reader = null;
            try {
                String currentLine;
                reader = new BufferedReader(new FileReader(COMMAND_LIST_PATH));
                while ((currentLine = reader.readLine()) != null) {
                    if (HOVER_MODE.equals(currentLine))
                        return true;
                }
            } catch (IOException e) {
                // Ignore exception, will be false anyway
            } finally {
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (IOException e) {
                        // Ignore exception, no recovery possible
                    }
                }
            }
        }
        return false;
    }

    /** This method returns the current activation status of touchscreen hovering
     *
     * @return boolean Must be false if touchscreen hovering is not supported or not activated,
     * or the operation failed while reading the status; true in any other case.
     */
    public static boolean isEnabled() {
        return FileUtils.readOneLine(COMMAND_RESULT_PATH).equals(HOVER_MODE_ENABLE + STATUS_OK);
    }

    /**
     * This method allows to setup touchscreen hovering status.
     *
     * @param status The new touchscreen hovering status
     * @return boolean Must be false if touchscreen hovering is not supported or the operation
     * failed; true in any other case.
     */
    public static boolean setEnabled(boolean status) {
        return FileUtils.writeLine(COMMAND_PATH, status ? HOVER_MODE_ENABLE : HOVER_MODE_DISABLE);
    }
}