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Add support for background scanning

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Background scanning (preferred network offload) allows us the
host to sleep while the dongle monitors the presence of any
preferred networks. This allows us for significant power savings
since the system does not have to wake up often to initiate
a scan

Bug: 3453021
Change-Id: I7c1dbfd0c3f717df81e4da6091c4c5657c9ec9ca
This commit is contained in:
Irfan Sheriff
2011-02-17 16:44:54 -08:00
parent 25474a2230
commit fcc0845cf9
5 changed files with 95 additions and 9 deletions
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12
services/java/com/android/server/WifiService.java
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@ -96,6 +96,9 @@ public class WifiService extends IWifiManager.Stub {
private boolean mDeviceIdle;
private int mPluggedType;
/* Chipset supports background scan */
private final boolean mBackgroundScanSupported;
// true if the user enabled Wifi while in airplane mode
private AtomicBoolean mAirplaneModeOverwridden = new AtomicBoolean(false);
@ -369,6 +372,9 @@ public class WifiService extends IWifiManager.Stub {
Settings.Secure.WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY, 900) * 1000l;
mNotificationEnabledSettingObserver = new NotificationEnabledSettingObserver(new Handler());
mNotificationEnabledSettingObserver.register();
mBackgroundScanSupported = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_wifi_background_scan_support);
}
/**
@ -900,6 +906,9 @@ public class WifiService extends IWifiManager.Stub {
reportStartWorkSource();
evaluateTrafficStatsPolling();
mWifiStateMachine.enableRssiPolling(true);
if (mBackgroundScanSupported) {
mWifiStateMachine.enableBackgroundScan(false);
}
mWifiStateMachine.enableAllNetworks();
updateWifiState();
} else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
@ -909,6 +918,9 @@ public class WifiService extends IWifiManager.Stub {
mScreenOff = true;
evaluateTrafficStatsPolling();
mWifiStateMachine.enableRssiPolling(false);
if (mBackgroundScanSupported) {
mWifiStateMachine.enableBackgroundScan(true);
}
/*
* 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