Switch from uevent model to /dev/input/event.

Headsets are now detected from calls coming in from the input switch
subsystem if a config.xml value is set to true.

Bug: 6548391.

Change-Id: I79259d2742e157b106a746474f32ffd1c171ddf3

Author: Craig Mautner

core/res/res/values/config.xml

@@ -960,4 +960,8 @@
     -->
     <bool name="config_enableWifiDisplay">false</bool>
 
+    <!-- When true use the linux /dev/input/event subsystem to detect the switch changes
+         on the headphone/microphone jack. When false use the older uevent framework. -->
+    <bool name="config_useDevInputEventForAudioJack">false</bool>
+
 </resources>

core/res/res/values/symbols.xml

@@ -271,7 +271,8 @@
   <java-symbol type="bool" name="config_enableScreenshotChord" />
   <java-symbol type="bool" name="config_bluetooth_default_profiles" />
   <java-symbol type="bool" name="config_enableWifiDisplay" />
-
+  <java-symbol type="bool" name="config_useDevInputEventForAudioJack" />
+  
   <java-symbol type="integer" name="config_cursorWindowSize" />
   <java-symbol type="integer" name="config_longPressOnPowerBehavior" />
   <java-symbol type="integer" name="config_max_pan_devices" />

services/java/com/android/server/SystemServer.java

@@ -631,11 +631,12 @@ public void run() {
             }
 
             try {
-                Slog.i(TAG, "Wired Accessory Observer");
+                Slog.i(TAG, "Wired Accessory Manager");
                 // Listen for wired headset changes
-                new WiredAccessoryObserver(context);
+                inputManager.setWiredAccessoryCallbacks(
+                        new WiredAccessoryManager(context, inputManager));
             } catch (Throwable e) {
-                reportWtf("starting WiredAccessoryObserver", e);
+                reportWtf("starting WiredAccessoryManager", e);
             }
 
             try {