potter: create a "fake" KeyHandler

Change-Id: I9e35d4e3d12a9b7274bdf8547ab275d44c8144e3

cmhw/org/cyanogenmod/hardware/KeyDisabler.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2014 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.internal.util.FileUtils;
+
+/*
+ * Disable capacitive keys
+ *
+ * This is intended for use on devices in which the capacitive keys
+ * can be fully disabled for replacement with a soft navbar. You
+ * really should not be using this on a device with mechanical or
+ * otherwise visible-when-inactive keys
+ */
+
+public class KeyDisabler {
+
+    private static String CONTROL_PATH = "/sys/homebutton/enable";
+
+    public static boolean isSupported() {
+        return FileUtils.isFileWritable(CONTROL_PATH);
+    }
+
+    public static boolean isActive() {
+        return FileUtils.readOneLine(CONTROL_PATH).equals("0");
+    }
+
+    public static boolean setActive(boolean state) {
+        return true;
+    }
+}