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>

1 files changed, 49 insertions, 0 deletions

diff --git a/services/java/com/android/server/LightsService.java b/services/java/com/android/server/LightsService.java
index c056eef..9b57735 100644
--- a/services/java/com/android/server/LightsService.java
+++ b/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 @@ public class LightsService {
         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);
         }