Fix HTC Headphones

services/java/com/android/server/WiredAccessoryManager.java

@@ -306,7 +306,7 @@ void init() {
                         FileReader file = new FileReader(uei.getSwitchStatePath());
                         int len = file.read(buffer, 0, 1024);
                         file.close();
-                        curState = Integer.valueOf((new String(buffer, 0, len)).trim());
+                        curState = validateSwitchState(Integer.valueOf((new String(buffer, 0, len)).trim())); 
 
                         if (curState > 0) {
                             updateStateLocked(uei.getDevPath(), uei.getDevName(), curState);
@@ -328,7 +328,13 @@ void init() {
                 startObserving("DEVPATH="+uei.getDevPath());
             }
         }
-
+        private int validateSwitchState(int state) {
+            // Some drivers, namely HTC headset ones, add additional bits to
+            // the switch state. As we only are able to deal with the states
+            // 0, 1 and 2, mask out all the other bits
+            return state & 0x3;
+        }
+
         private List<UEventInfo> makeObservedUEventList() {
             List<UEventInfo> retVal = new ArrayList<UEventInfo>();
             UEventInfo uei;
@@ -381,7 +387,7 @@ public void onUEvent(UEventObserver.UEvent event) {
             try {
                 String devPath = event.get("DEVPATH");
                 String name = event.get("SWITCH_NAME");
-                int state = Integer.parseInt(event.get("SWITCH_STATE"));
+                int state = validateSwitchState(Integer.parseInt(event.get("SWITCH_STATE"))); 
                 synchronized (mLock) {
                     updateStateLocked(devPath, name, state);
                 }