From babf19136cc373e5f169abc9be5c1f25f243d9d0 Mon Sep 17 00:00:00 2001
From: Nick Pelly <>
Date: Wed, 8 Apr 2009 19:22:53 -0700
Subject: [PATCH] AI 145203: am: CL 145201 Hold wakelock while delaying for
 audio route switch after headset unplug.   Fixes bug where we go to sleep
 before switching audio, and we lose audio until the apps CPU wakes up again. 
  Original author: npelly

Automated import of CL 145203
---
 .../java/com/android/server/HeadsetObserver.java   | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/services/java/com/android/server/HeadsetObserver.java b/services/java/com/android/server/HeadsetObserver.java
index c9066bedd96bd..3fc1e0ea58794 100644
--- a/services/java/com/android/server/HeadsetObserver.java
+++ b/services/java/com/android/server/HeadsetObserver.java
@@ -21,6 +21,8 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Handler;
 import android.os.Message;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
 import android.os.UEventObserver;
 import android.util.Log;
 import android.media.AudioManager;
@@ -38,15 +40,19 @@ class HeadsetObserver extends UEventObserver {
     private static final String HEADSET_STATE_PATH = "/sys/class/switch/h2w/state";
     private static final String HEADSET_NAME_PATH = "/sys/class/switch/h2w/name";
 
-    private Context mContext;
-
     private int mHeadsetState;
     private String mHeadsetName;
     private boolean mAudioRouteNeedsUpdate;
     private AudioManager mAudioManager;
 
+    private final Context mContext;
+    private final WakeLock mWakeLock;  // held while there is a pending route change
+
     public HeadsetObserver(Context context) {
         mContext = context;
+        PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
+        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "HeadsetObserver");
+        mWakeLock.setReferenceCounted(false);
 
         startObserving(HEADSET_UEVENT_MATCH);
 
@@ -103,6 +109,7 @@ class HeadsetObserver extends UEventObserver {
                 // immediate, so delay the route change by 1000ms.
                 // This could be improved once the audio sub-system provides an
                 // interface to clear the audio pipeline.
+                mWakeLock.acquire();
                 mHandler.sendEmptyMessageDelayed(0, 1000);
             } else {
                 updateAudioRoute();
@@ -138,7 +145,8 @@ class HeadsetObserver extends UEventObserver {
         @Override
         public void handleMessage(Message msg) {
             updateAudioRoute();
+            mWakeLock.release();
         }
-    };        
+    };
 
 }