am 093e9890: am 34afdf02: Merge "Automatic brightness using ALS while dozing." into lmp-mr1-dev

* commit '093e98908743eb37104a280541a060dcd46351d0':
  Automatic brightness using ALS while dozing.

core/res/res/values/config.xml

@@ -801,6 +801,13 @@
          that can be set by the user. -->
     <integer name="config_screenBrightnessDoze">1</integer>
 
+    <!-- Allow automatic adjusting of the screen brightness while dozing in low power state. -->
+    <bool name="config_allowAutoBrightnessWhileDozing">false</bool>
+
+    <!-- If we allow automatic adjustment of screen brightness while dozing, how many times we want
+         to reduce it to preserve the battery. Value of 100% means no scaling. -->
+    <fraction name="config_screenAutoBrightnessDozeScaleFactor">100%</fraction>
+
     <!-- Screen brightness used to dim the screen when the user activity
          timeout expires.  May be less than the minimum allowed brightness setting
          that can be set by the user. -->

core/res/res/values/symbols.xml

@@ -1574,6 +1574,7 @@
   <java-symbol type="bool" name="config_enableNetworkLocationOverlay" />
   <java-symbol type="bool" name="config_sf_limitedAlpha" />
   <java-symbol type="bool" name="config_unplugTurnsOnScreen" />
+  <java-symbol type="bool" name="config_allowAutoBrightnessWhileDozing" />
   <java-symbol type="bool" name="config_allowTheaterModeWakeFromUnplug" />
   <java-symbol type="bool" name="config_allowTheaterModeWakeFromGesture" />
   <java-symbol type="bool" name="config_allowTheaterModeWakeFromCameraLens" />
@@ -1615,6 +1616,7 @@
   <java-symbol type="id" name="replace_app_icon" />
   <java-symbol type="id" name="replace_message" />
   <java-symbol type="fraction" name="config_dimBehindFadeDuration" />
+  <java-symbol type="fraction" name="config_screenAutoBrightnessDozeScaleFactor" />
   <java-symbol type="integer" name="config_carDockKeepsScreenOn" />
   <java-symbol type="integer" name="config_criticalBatteryWarningLevel" />
   <java-symbol type="integer" name="config_datause_notification_type" />

services/core/java/com/android/server/display/AutomaticBrightnessController.java

@@ -21,7 +21,6 @@ import com.android.server.twilight.TwilightListener;
 import com.android.server.twilight.TwilightManager;
 import com.android.server.twilight.TwilightState;
 
-import android.content.res.Resources;
 import android.hardware.Sensor;
 import android.hardware.SensorEvent;
 import android.hardware.SensorEventListener;
@@ -120,6 +119,7 @@ class AutomaticBrightnessController {
     // The minimum and maximum screen brightnesses.
     private final int mScreenBrightnessRangeMinimum;
     private final int mScreenBrightnessRangeMaximum;
+    private final float mDozeScaleFactor;
 
     // Amount of time to delay auto-brightness after screen on while waiting for
     // the light sensor to warm-up in milliseconds.
@@ -171,9 +171,12 @@ class AutomaticBrightnessController {
     // The last screen auto-brightness gamma.  (For printing in dump() only.)
     private float mLastScreenAutoBrightnessGamma = 1.0f;
 
+    // Are we going to adjust brightness while dozing.
+    private boolean mDozing;
+
     public AutomaticBrightnessController(Callbacks callbacks, Looper looper,
-            SensorManager sensorManager, Spline autoBrightnessSpline,
+            SensorManager sensorManager, Spline autoBrightnessSpline, int lightSensorWarmUpTime,
-            int lightSensorWarmUpTime, int brightnessMin, int brightnessMax) {
+            int brightnessMin, int brightnessMax, float dozeScaleFactor) {
         mCallbacks = callbacks;
         mTwilight = LocalServices.getService(TwilightManager.class);
         mSensorManager = sensorManager;
@@ -181,6 +184,7 @@ class AutomaticBrightnessController {
         mScreenBrightnessRangeMinimum = brightnessMin;
         mScreenBrightnessRangeMaximum = brightnessMax;
         mLightSensorWarmUpTimeConfig = lightSensorWarmUpTime;
+        mDozeScaleFactor = dozeScaleFactor;
 
         mHandler = new AutomaticBrightnessHandler(looper);
         mAmbientLightRingBuffer = new AmbientLightRingBuffer();
@@ -195,11 +199,20 @@ class AutomaticBrightnessController {
     }
 
     public int getAutomaticScreenBrightness() {
+        if (mDozing) {
+            return (int) (mScreenAutoBrightness * mDozeScaleFactor);
+        }
         return mScreenAutoBrightness;
     }
 
-    public void configure(boolean enable, float adjustment) {
+    public void configure(boolean enable, float adjustment, boolean dozing) {
-        boolean changed = setLightSensorEnabled(enable);
+        // While dozing, the application processor may be suspended which will prevent us from
+        // receiving new information from the light sensor. On some devices, we may be able to
+        // switch to a wake-up light sensor instead but for now we will simply disable the sensor
+        // and hold onto the last computed screen auto brightness.  We save the dozing flag for
+        // debugging purposes.
+        mDozing = dozing;
+        boolean changed = setLightSensorEnabled(enable && !dozing);
         changed |= setScreenAutoBrightnessAdjustment(adjustment);
         if (changed) {
             updateAutoBrightness(false /*sendUpdate*/);
@@ -230,6 +243,7 @@ class AutomaticBrightnessController {
         pw.println("  mScreenAutoBrightness=" + mScreenAutoBrightness);
         pw.println("  mScreenAutoBrightnessAdjustment=" + mScreenAutoBrightnessAdjustment);
         pw.println("  mLastScreenAutoBrightnessGamma=" + mLastScreenAutoBrightnessGamma);
+        pw.println("  mDozing=" + mDozing);
     }
 
     private boolean setLightSensorEnabled(boolean enable) {

services/core/java/com/android/server/display/DisplayPowerController.java

@@ -155,6 +155,9 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
     // True if auto-brightness should be used.
     private boolean mUseSoftwareAutoBrightnessConfig;
 
+    // True if should use light sensor to automatically determine doze screen brightness.
+    private final boolean mAllowAutoBrightnessWhileDozingConfig;
+
     // True if we should fade the screen while turning it off, false if we should play
     // a stylish color fade animation instead.
     private boolean mColorFadeFadesConfig;
@@ -295,6 +298,10 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
 
         mUseSoftwareAutoBrightnessConfig = resources.getBoolean(
                 com.android.internal.R.bool.config_automatic_brightness_available);
+
+        mAllowAutoBrightnessWhileDozingConfig = resources.getBoolean(
+                com.android.internal.R.bool.config_allowAutoBrightnessWhileDozing);
+
         if (mUseSoftwareAutoBrightnessConfig) {
             int[] lux = resources.getIntArray(
                     com.android.internal.R.array.config_autoBrightnessLevels);
@@ -302,6 +309,9 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
                     com.android.internal.R.array.config_autoBrightnessLcdBacklightValues);
             int lightSensorWarmUpTimeConfig = resources.getInteger(
                     com.android.internal.R.integer.config_lightSensorWarmupTime);
+            final float dozeScaleFactor = resources.getFraction(
+                    com.android.internal.R.fraction.config_screenAutoBrightnessDozeScaleFactor,
+                    1, 1);
 
             Spline screenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness);
             if (screenAutoBrightnessSpline == null) {
@@ -326,7 +336,7 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
                 mAutomaticBrightnessController = new AutomaticBrightnessController(this,
                         handler.getLooper(), sensorManager, screenAutoBrightnessSpline,
                         lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum,
-                        mScreenBrightnessRangeMaximum);
+                        mScreenBrightnessRangeMaximum, dozeScaleFactor);
             }
         }
 
@@ -523,7 +533,9 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
                 } else {
                     state = Display.STATE_DOZE;
                 }
-                brightness = mPowerRequest.dozeScreenBrightness;
+                if (!mAllowAutoBrightnessWhileDozingConfig) {
+                    brightness = mPowerRequest.dozeScreenBrightness;
+                }
                 break;
             case DisplayPowerRequest.POLICY_DIM:
             case DisplayPowerRequest.POLICY_BRIGHT:
@@ -577,19 +589,16 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
             brightness = PowerManager.BRIGHTNESS_ON;
         }
 
-        // Use default brightness when dozing unless overridden.
-        if (brightness < 0 && (state == Display.STATE_DOZE
-                || state == Display.STATE_DOZE_SUSPEND)) {
-            brightness = mScreenBrightnessDozeConfig;
-        }
-
         // Configure auto-brightness.
         boolean autoBrightnessEnabled = false;
         if (mAutomaticBrightnessController != null) {
+            final boolean autoBrightnessEnabledInDoze = mAllowAutoBrightnessWhileDozingConfig
+                    && (state == Display.STATE_DOZE || state == Display.STATE_DOZE_SUSPEND);
             autoBrightnessEnabled = mPowerRequest.useAutoBrightness
-                    && state == Display.STATE_ON && brightness < 0;
+                    && (state == Display.STATE_ON || autoBrightnessEnabledInDoze)
+                    && brightness < 0;
             mAutomaticBrightnessController.configure(autoBrightnessEnabled,
-                    mPowerRequest.screenAutoBrightnessAdjustment);
+                    mPowerRequest.screenAutoBrightnessAdjustment, state != Display.STATE_ON);
         }
 
         // Apply auto-brightness.
@@ -612,6 +621,12 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
             mAppliedAutoBrightness = false;
         }
 
+        // Use default brightness when dozing unless overridden.
+        if (brightness < 0 && (state == Display.STATE_DOZE
+                || state == Display.STATE_DOZE_SUSPEND)) {
+            brightness = mScreenBrightnessDozeConfig;
+        }
+
         // Apply manual brightness.
         // Use the current brightness setting from the request, which is expected
         // provide a nominal default value for the case where auto-brightness
@@ -1024,6 +1039,8 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
         pw.println("  mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum);
         pw.println("  mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum);
         pw.println("  mUseSoftwareAutoBrightnessConfig=" + mUseSoftwareAutoBrightnessConfig);
+        pw.println("  mAllowAutoBrightnessWhileDozingConfig=" +
+                mAllowAutoBrightnessWhileDozingConfig);
         pw.println("  mColorFadeFadesConfig=" + mColorFadeFadesConfig);
 
         mHandler.runWithScissors(new Runnable() {