From f32be166d56302b59c242a1296a6b03862f3c061 Mon Sep 17 00:00:00 2001
From: Mike Lockwood <lockwood@android.com>
Date: Tue, 14 Jul 2009 17:44:37 -0400
Subject: wifi: Disable RSSI polling when the screen is off.

Signed-off-by: Mike Lockwood <lockwood@android.com>
---
 services/java/com/android/server/WifiService.java |  3 +++
 wifi/java/android/net/wifi/WifiStateTracker.java  | 22 ++++++++++++++++------
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/services/java/com/android/server/WifiService.java b/services/java/com/android/server/WifiService.java
index 01394ad..b4754b6 100644
--- a/services/java/com/android/server/WifiService.java
+++ b/services/java/com/android/server/WifiService.java
@@ -192,6 +192,7 @@ public class WifiService extends IWifiManager.Stub {
     WifiService(Context context, WifiStateTracker tracker) {
         mContext = context;
         mWifiStateTracker = tracker;
+        mWifiStateTracker.enableRssiPolling(true);
         mBatteryStats = BatteryStatsService.getService();
         
         /*
@@ -1560,9 +1561,11 @@ public class WifiService extends IWifiManager.Stub {
                 mAlarmManager.cancel(mIdleIntent);
                 mDeviceIdle = false;
                 mScreenOff = false;
+                mWifiStateTracker.enableRssiPolling(true);
             } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
                 Log.d(TAG, "ACTION_SCREEN_OFF");
                 mScreenOff = true;
+                mWifiStateTracker.enableRssiPolling(false);
                 /*
                  * Set a timer to put Wi-Fi to sleep, but only if the screen is off
                  * AND the "stay on while plugged in" setting doesn't match the
diff --git a/wifi/java/android/net/wifi/WifiStateTracker.java b/wifi/java/android/net/wifi/WifiStateTracker.java
index 63687b3..3aa31bf 100644
--- a/wifi/java/android/net/wifi/WifiStateTracker.java
+++ b/wifi/java/android/net/wifi/WifiStateTracker.java
@@ -239,6 +239,7 @@ public class WifiStateTracker extends NetworkStateTracker {
     
     private boolean mIsScanModeActive;
     private boolean mIsScanModeSetDueToAHiddenNetwork;
+    private boolean mEnableRssiPolling;
 
     // Wi-Fi run states:
     private static final int RUN_STATE_STARTING = 1;
@@ -338,6 +339,7 @@ public class WifiStateTracker extends NetworkStateTracker {
     private void setSupplicantState(SupplicantState state) {
         mWifiInfo.setSupplicantState(state);
         updateNetworkInfo();
+        checkPollTimer();
     }
 
     public SupplicantState getSupplicantState() {
@@ -352,6 +354,7 @@ public class WifiStateTracker extends NetworkStateTracker {
     private void setSupplicantState(String stateName) {
         mWifiInfo.setSupplicantState(stateName);
         updateNetworkInfo();
+        checkPollTimer();
     }
 
     /**
@@ -540,8 +543,10 @@ public class WifiStateTracker extends NetworkStateTracker {
      * Set the interval timer for polling connection information
      * that is not delivered asynchronously.
      */
-    private synchronized void setPollTimer () {
-        if (!hasMessages(EVENT_POLL_INTERVAL)) {
+    private synchronized void checkPollTimer() {
+        if (mEnableRssiPolling &&
+                mWifiInfo.getSupplicantState() == SupplicantState.COMPLETED &&
+                !hasMessages(EVENT_POLL_INTERVAL)) {
             sendEmptyMessageDelayed(EVENT_POLL_INTERVAL, POLL_STATUS_INTERVAL_MSECS);
         }
     }
@@ -637,6 +642,13 @@ public class WifiStateTracker extends NetworkStateTracker {
         setBluetoothScanMode(isBluetoothPlaying);
     }
 
+    public void enableRssiPolling(boolean enable) {
+        if (mEnableRssiPolling != enable) {
+            mEnableRssiPolling = enable;
+            checkPollTimer();
+        }
+    }
+
     @Override
     public void releaseWakeLock() {
         if (mReleaseWakeLockCallback != null) {
@@ -1022,9 +1034,7 @@ public class WifiStateTracker extends NetworkStateTracker {
             case EVENT_POLL_INTERVAL:
                 if (mWifiInfo.getSupplicantState() != SupplicantState.UNINITIALIZED) {
                     requestPolledInfo(mWifiInfo);
-                    if (mWifiInfo.getSupplicantState() == SupplicantState.COMPLETED) {
-                        setPollTimer();
-                    }
+                    checkPollTimer();
                 }
                 break;
             
@@ -1163,7 +1173,7 @@ public class WifiStateTracker extends NetworkStateTracker {
     }
 
     private void configureInterface() {
-        setPollTimer();
+        checkPollTimer();
         mLastSignalLevel = -1;
         if (!mUseStaticIp) {
             if (!mHaveIpAddress && !mObtainingIpAddress) {
-- 
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