Resurrect flashlight support in obsolete IHardwareService Binder API.

This is to avoid flashlight apps that had been using reflection to access
this API after this class was removed after eclair.

Change-Id: I26ed929abad93345468eb33d4a15977a31ebea7e
Signed-off-by: Mike Lockwood <lockwood@android.com>

Author: mikeandroid

Android.mk

@@ -117,7 +117,8 @@ LOCAL_SRC_FILES += \
 	core/java/android/hardware/ISensorService.aidl \
 	core/java/android/net/IConnectivityManager.aidl \
 	core/java/android/net/INetworkManagementEventObserver.aidl \
-        core/java/android/net/IThrottleManager.aidl \
+	core/java/android/net/IThrottleManager.aidl \
+	core/java/android/os/IHardwareService.aidl \
 	core/java/android/os/IMessenger.aidl \
 	core/java/android/os/storage/IMountService.aidl \
 	core/java/android/os/storage/IMountServiceListener.aidl \

core/java/android/os/IHardwareService.aidl

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2007, The Android Open Source 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 android.os;
+
+/** {@hide} */
+interface IHardwareService
+{
+    // obsolete flashlight support
+    boolean getFlashlightEnabled();
+    void setFlashlightEnabled(boolean on);
+}
+

services/java/com/android/server/LightsService.java

@@ -17,10 +17,17 @@
 package com.android.server;
 
 import android.content.Context;
+import android.content.pm.PackageManager;
 import android.os.Handler;
+import android.os.IHardwareService;
+import android.os.ServiceManager;
 import android.os.Message;
 import android.util.Slog;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+
 public class LightsService {
     private static final String TAG = "LightsService";
 
@@ -124,11 +131,53 @@ private void setLightLocked(int color, int mode, int onMS, int offMS, int bright
         private boolean mFlashing;
     }
 
+    /* This class implements an obsolete API that was removed after eclair and re-added during the
+     * final moments of the froyo release to support flashlight apps that had been using the private
+     * IHardwareService API. This is expected to go away in the next release.
+     */
+    private final IHardwareService.Stub mLegacyFlashlightHack = new IHardwareService.Stub() {
+
+        private static final String FLASHLIGHT_FILE = "/sys/class/leds/spotlight/brightness";
+
+        public boolean getFlashlightEnabled() {
+            try {
+                FileInputStream fis = new FileInputStream(FLASHLIGHT_FILE);
+                int result = fis.read();
+                fis.close();
+                return (result != '0');
+            } catch (Exception e) {
+                Slog.e(TAG, "getFlashlightEnabled failed", e);
+                return false;
+            }
+        }
+
+        public void setFlashlightEnabled(boolean on) {
+            if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.FLASHLIGHT)
+                    != PackageManager.PERMISSION_GRANTED &&
+                    mContext.checkCallingOrSelfPermission(android.Manifest.permission.HARDWARE_TEST)
+                    != PackageManager.PERMISSION_GRANTED) {
+                throw new SecurityException("Requires FLASHLIGHT or HARDWARE_TEST permission");
+            }
+            try {
+                FileOutputStream fos = new FileOutputStream(FLASHLIGHT_FILE);
+                byte[] bytes = new byte[2];
+                bytes[0] = (byte)(on ? '1' : '0');
+                bytes[1] = '\n';
+                fos.write(bytes);
+                fos.close();
+            } catch (Exception e) {
+                Slog.e(TAG, "setFlashlightEnabled failed", e);
+            }
+        }
+    };
+
     LightsService(Context context) {
 
         mNativePointer = init_native();
         mContext = context;
 
+        ServiceManager.addService("hardware", mLegacyFlashlightHack);
+
         for (int i = 0; i < LIGHT_ID_COUNT; i++) {
             mLights[i] = new Light(i);
         }