cmhw: Add touchscreen hovering support

Change-Id: Ia581d6cc6f30b3de91c08ed5be3c4ba76b9a5d31

cmhw/org/cyanogenmod/hardware/TouchscreenHovering.java

@@ -0,0 +1,93 @@
+/*
+ * 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);
+    }
+}