Merge "Use a brightness sensor to determine the screen's initial brightness" (49e55e1a) · Commits · e / os / android_frameworks_base

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

+57 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@ import com.android.server.display.config.DisplayConfiguration;
		import com.android.server.display.config.DisplayQuirks;
		import com.android.server.display.config.HbmTiming;
		import com.android.server.display.config.HighBrightnessMode;
		import com.android.server.display.config.IntegerArray;
		import com.android.server.display.config.NitsMap;
		import com.android.server.display.config.Point;
		import com.android.server.display.config.RefreshRateConfigs;
		@@ -213,6 +214,10 @@ import javax.xml.datatype.DatatypeConfigurationException;
		* <type>android.sensor.light</type>
		* <name>1234 Ambient Light Sensor</name>
		* </lightSensor>
		* <screenOffBrightnessSensor>
		* <type>com.google.sensor.binned_brightness</type>
		* <name>Binned Brightness 0 (wake-up)</name>
		* </screenOffBrightnessSensor>
		* <proxSensor>
		* <type>android.sensor.proximity</type>
		* <name>1234 Proximity Sensor</name>
		@@ -368,6 +373,13 @@ import javax.xml.datatype.DatatypeConfigurationException;
		* </brightnessThresholdPoints>
		* </darkeningThresholds>
		* </displayBrightnessChangeThresholdsIdle>
		* <screenOffBrightnessSensorValueToLux>
		* <item>-1</item>
		* <item>0</item>
		* <item>5</item>
		* <item>80</item>
		* <item>1500</item>
		* </screenOffBrightnessSensorValueToLux>
		* </displayConfiguration>
		* }
		* </pre>
		@@ -428,6 +440,9 @@ public class DisplayDeviceConfig {
		// The details of the ambient light sensor associated with this display.
		private final SensorData mAmbientLightSensor = new SensorData();

		// The details of the doze brightness sensor associated with this display.
		private final SensorData mScreenOffBrightnessSensor = new SensorData();

		// The details of the proximity sensor associated with this display.
		private final SensorData mProximitySensor = new SensorData();

		@@ -523,6 +538,9 @@ public class DisplayDeviceConfig {
		private float[] mAmbientDarkeningLevelsIdle = DEFAULT_AMBIENT_THRESHOLD_LEVELS;
		private float[] mAmbientDarkeningPercentagesIdle = DEFAULT_AMBIENT_DARKENING_THRESHOLDS;

		// A mapping between screen off sensor values and lux values
		private int[] mScreenOffBrightnessSensorValueToLux;

		private Spline mBrightnessToBacklightSpline;
		private Spline mBacklightToBrightnessSpline;
		private Spline mBacklightToNitsSpline;
		@@ -1197,6 +1215,10 @@ public class DisplayDeviceConfig {
		return mAmbientLightSensor;
		}

		SensorData getScreenOffBrightnessSensor() {
		return mScreenOffBrightnessSensor;
		}

		SensorData getProximitySensor() {
		return mProximitySensor;
		}
		@@ -1320,6 +1342,14 @@ public class DisplayDeviceConfig {
		return mHighAmbientBrightnessThresholds;
		}

		/**
		* @return A mapping from screen off brightness sensor readings to lux values. This estimates
		* the ambient lux when the screen is off to determine the initial brightness
		*/
		public int[] getScreenOffBrightnessSensorValueToLux() {
		return mScreenOffBrightnessSensorValueToLux;
		}

		@Override
		public String toString() {
		return "DisplayDeviceConfig{"
		@@ -1398,6 +1428,7 @@ public class DisplayDeviceConfig {
		mScreenDarkeningPercentagesIdle)
		+ "\n"
		+ ", mAmbientLightSensor=" + mAmbientLightSensor
		+ ", mScreenOffBrightnessSensor=" + mScreenOffBrightnessSensor
		+ ", mProximitySensor=" + mProximitySensor
		+ ", mRefreshRateLimitations= " + Arrays.toString(mRefreshRateLimitations.toArray())
		+ ", mDensityMapping= " + mDensityMapping
		@@ -1420,6 +1451,9 @@ public class DisplayDeviceConfig {
		+ Arrays.toString(mHighDisplayBrightnessThresholds)
		+ ", mHighAmbientBrightnessThresholds= "
		+ Arrays.toString(mHighAmbientBrightnessThresholds)
		+ "\n"
		+ ", mScreenOffBrightnessSensorValueToLux=" + Arrays.toString(
		mScreenOffBrightnessSensorValueToLux)
		+ "}";
		}

		@@ -1473,11 +1507,13 @@ public class DisplayDeviceConfig {
		loadQuirks(config);
		loadBrightnessRamps(config);
		loadAmbientLightSensorFromDdc(config);
		loadScreenOffBrightnessSensorFromDdc(config);
		loadProxSensorFromDdc(config);
		loadAmbientHorizonFromDdc(config);
		loadBrightnessChangeThresholds(config);
		loadAutoBrightnessConfigValues(config);
		loadRefreshRateSetting(config);
		loadScreenOffBrightnessSensorValueToLuxFromDdc(config);
		} else {
		Slog.w(TAG, "DisplayDeviceConfig file is null");
		}
		@@ -2169,6 +2205,14 @@ public class DisplayDeviceConfig {
		mProximitySensor.type = null;
		}

		private void loadScreenOffBrightnessSensorFromDdc(DisplayConfiguration config) {
		final SensorDetails sensorDetails = config.getScreenOffBrightnessSensor();
		if (sensorDetails != null) {
		mScreenOffBrightnessSensor.type = sensorDetails.getType();
		mScreenOffBrightnessSensor.name = sensorDetails.getName();
		}
		}

		private void loadProxSensorFromDdc(DisplayConfiguration config) {
		SensorDetails sensorDetails = config.getProxSensor();
		if (sensorDetails != null) {
		@@ -2573,6 +2617,19 @@ public class DisplayDeviceConfig {
		&& mDdcAutoBrightnessAvailable;
		}

		private void loadScreenOffBrightnessSensorValueToLuxFromDdc(DisplayConfiguration config) {
		IntegerArray sensorValueToLux = config.getScreenOffBrightnessSensorValueToLux();
		if (sensorValueToLux == null) {
		return;
		}

		List<BigInteger> items = sensorValueToLux.getItem();
		mScreenOffBrightnessSensorValueToLux = new int[items.size()];
		for (int i = 0; i < items.size(); i++) {
		mScreenOffBrightnessSensorValueToLux[i] = items.get(i).intValue();
		}
		}

		static class SensorData {
		public String type;
		public String name;

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

+48 −0

Original line number	Diff line number	Diff line
		@@ -408,7 +408,12 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
		@Nullable
		private AutomaticBrightnessController mAutomaticBrightnessController;

		// The controller for the sensor used to estimate ambient lux while the display is off.
		@Nullable
		private ScreenOffBrightnessSensorController mScreenOffBrightnessSensorController;

		private Sensor mLightSensor;
		private Sensor mScreenOffBrightnessSensor;

		// The mappers between ambient lux, display backlight values, and display brightness.
		// We will switch between the idle mapper and active mapper in AutomaticBrightnessController.
		@@ -1077,6 +1082,19 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call

		mBrightnessEventRingBuffer =
		new RingBuffer<>(BrightnessEvent.class, RINGBUFFER_MAX);

		loadScreenOffBrightnessSensor();
		int[] sensorValueToLux = mDisplayDeviceConfig.getScreenOffBrightnessSensorValueToLux();
		if (mScreenOffBrightnessSensor != null && sensorValueToLux != null) {
		mScreenOffBrightnessSensorController = new ScreenOffBrightnessSensorController(
		mSensorManager,
		mScreenOffBrightnessSensor,
		mHandler,
		SystemClock::uptimeMillis,
		sensorValueToLux,
		mInteractiveModeBrightnessMapper
		);
		}
		} else {
		mUseSoftwareAutoBrightnessConfig = false;
		}
		@@ -1262,6 +1280,12 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
		}
		assert (state != Display.STATE_UNKNOWN);

		if (mScreenOffBrightnessSensorController != null) {
		mScreenOffBrightnessSensorController.setLightSensorEnabled(mUseAutoBrightness
		&& (state == Display.STATE_OFF \|\| (state == Display.STATE_DOZE
		&& !mAllowAutoBrightnessWhileDozingConfig)));
		}

		boolean skipRampBecauseOfProximityChangeToNegative = false;
		// Apply the proximity sensor.
		if (mProximitySensor != null) {
		@@ -1433,6 +1457,9 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
		updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
		mAppliedAutoBrightness = true;
		mBrightnessReasonTemp.setReason(BrightnessReason.REASON_AUTOMATIC);
		if (mScreenOffBrightnessSensorController != null) {
		mScreenOffBrightnessSensorController.setLightSensorEnabled(false);
		}
		} else {
		mAppliedAutoBrightness = false;
		}
		@@ -1460,6 +1487,19 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
		mBrightnessReasonTemp.setReason(BrightnessReason.REASON_DOZE_DEFAULT);
		}

		// The ALS is not available yet - use the screen off sensor to determine the initial
		// brightness
		if (Float.isNaN(brightnessState) && autoBrightnessEnabled
		&& mScreenOffBrightnessSensorController != null) {
		brightnessState = mScreenOffBrightnessSensorController.getAutomaticScreenBrightness();
		if (isValidBrightnessValue(brightnessState)) {
		brightnessState = clampScreenBrightness(brightnessState);
		updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
		mBrightnessReasonTemp.setReason(
		BrightnessReason.REASON_SCREEN_OFF_BRIGHTNESS_SENSOR);
		}
		}

		// Apply manual brightness.
		if (Float.isNaN(brightnessState)) {
		brightnessState = clampScreenBrightness(mCurrentScreenBrightnessSetting);
		@@ -2034,6 +2074,14 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
		fallbackType);
		}

		private void loadScreenOffBrightnessSensor() {
		DisplayDeviceConfig.SensorData screenOffBrightnessSensor =
		mDisplayDeviceConfig.getScreenOffBrightnessSensor();
		mScreenOffBrightnessSensor = SensorUtils.findSensor(mSensorManager,
		screenOffBrightnessSensor.type, screenOffBrightnessSensor.name,
		SensorUtils.NO_FALLBACK);
		}

		private void loadProximitySensor() {
		if (DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) {
		return;

services/core/java/com/android/server/display/DisplayPowerController2.java

+49 −0

Original line number	Diff line number	Diff line
		@@ -360,7 +360,12 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal
		@Nullable
		private AutomaticBrightnessController mAutomaticBrightnessController;

		// The controller for the sensor used to estimate ambient lux while the display is off.
		@Nullable
		private ScreenOffBrightnessSensorController mScreenOffBrightnessSensorController;

		private Sensor mLightSensor;
		private Sensor mScreenOffBrightnessSensor;

		// The mappers between ambient lux, display backlight values, and display brightness.
		// We will switch between the idle mapper and active mapper in AutomaticBrightnessController.
		@@ -994,6 +999,19 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal

		mBrightnessEventRingBuffer =
		new RingBuffer<>(BrightnessEvent.class, RINGBUFFER_MAX);

		loadScreenOffBrightnessSensor();
		int[] sensorValueToLux = mDisplayDeviceConfig.getScreenOffBrightnessSensorValueToLux();
		if (mScreenOffBrightnessSensor != null && sensorValueToLux != null) {
		mScreenOffBrightnessSensorController = new ScreenOffBrightnessSensorController(
		mSensorManager,
		mScreenOffBrightnessSensor,
		mHandler,
		SystemClock::uptimeMillis,
		sensorValueToLux,
		mInteractiveModeBrightnessMapper
		);
		}
		} else {
		mUseSoftwareAutoBrightnessConfig = false;
		}
		@@ -1135,6 +1153,13 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal

		int state = mDisplayStateController
		.updateDisplayState(mPowerRequest, mIsEnabled, mIsInTransition);

		if (mScreenOffBrightnessSensorController != null) {
		mScreenOffBrightnessSensorController.setLightSensorEnabled(mUseAutoBrightness
		&& (state == Display.STATE_OFF \|\| (state == Display.STATE_DOZE
		&& !mDisplayBrightnessController.isAllowAutoBrightnessWhileDozingConfig())));
		}

		// Initialize things the first time the power state is changed.
		if (mustInitialize) {
		initialize(state);
		@@ -1224,6 +1249,9 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal
		updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
		mAppliedAutoBrightness = true;
		mBrightnessReasonTemp.setReason(BrightnessReason.REASON_AUTOMATIC);
		if (mScreenOffBrightnessSensorController != null) {
		mScreenOffBrightnessSensorController.setLightSensorEnabled(false);
		}
		} else {
		mAppliedAutoBrightness = false;
		}
		@@ -1251,6 +1279,19 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal
		mBrightnessReasonTemp.setReason(BrightnessReason.REASON_DOZE_DEFAULT);
		}

		// The ALS is not available yet - use the screen off sensor to determine the initial
		// brightness
		if (Float.isNaN(brightnessState) && autoBrightnessEnabled
		&& mScreenOffBrightnessSensorController != null) {
		brightnessState = mScreenOffBrightnessSensorController.getAutomaticScreenBrightness();
		if (isValidBrightnessValue(brightnessState)) {
		brightnessState = clampScreenBrightness(brightnessState);
		updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
		mBrightnessReasonTemp.setReason(
		BrightnessReason.REASON_SCREEN_OFF_BRIGHTNESS_SENSOR);
		}
		}

		// Apply manual brightness.
		if (Float.isNaN(brightnessState)) {
		brightnessState = clampScreenBrightness(mCurrentScreenBrightnessSetting);
		@@ -1819,6 +1860,14 @@ final class DisplayPowerController2 implements AutomaticBrightnessController.Cal
		fallbackType);
		}

		private void loadScreenOffBrightnessSensor() {
		DisplayDeviceConfig.SensorData screenOffBrightnessSensor =
		mDisplayDeviceConfig.getScreenOffBrightnessSensor();
		mScreenOffBrightnessSensor = SensorUtils.findSensor(mSensorManager,
		screenOffBrightnessSensor.type, screenOffBrightnessSensor.name,
		SensorUtils.NO_FALLBACK);
		}

		private float clampScreenBrightness(float value) {
		if (Float.isNaN(value)) {
		value = PowerManager.BRIGHTNESS_MIN;

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

0 → 100644

+127 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2022 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.server.display;

		import android.annotation.Nullable;
		import android.hardware.Sensor;
		import android.hardware.SensorEvent;
		import android.hardware.SensorEventListener;
		import android.hardware.SensorManager;
		import android.os.Handler;
		import android.os.PowerManager;
		import android.util.IndentingPrintWriter;

		import com.android.internal.annotations.VisibleForTesting;

		import java.io.PrintWriter;

		/**
		* Controls the light sensor when the screen is off. The sensor used here does not report lux values
		* but an index that needs to be mapped to a lux value.
		*/
		public class ScreenOffBrightnessSensorController implements SensorEventListener {
		private static final String TAG = "ScreenOffBrightnessSensorController";

		private static final int SENSOR_INVALID_VALUE = -1;
		private static final long SENSOR_VALUE_VALID_TIME_MILLIS = 1500;

		private final Handler mHandler;
		private final Clock mClock;
		private final SensorManager mSensorManager;
		private final Sensor mLightSensor;
		private final int[] mSensorValueToLux;

		private boolean mRegistered;
		private int mLastSensorValue = SENSOR_INVALID_VALUE;
		private long mSensorDisableTime = -1;

		// The mapper to translate ambient lux to screen brightness in the range [0, 1.0].
		@Nullable
		private final BrightnessMappingStrategy mBrightnessMapper;

		public ScreenOffBrightnessSensorController(
		SensorManager sensorManager,
		Sensor lightSensor,
		Handler handler,
		Clock clock,
		int[] sensorValueToLux,
		BrightnessMappingStrategy brightnessMapper) {
		mSensorManager = sensorManager;
		mLightSensor = lightSensor;
		mHandler = handler;
		mClock = clock;
		mSensorValueToLux = sensorValueToLux;
		mBrightnessMapper = brightnessMapper;
		}

		@Override
		public void onSensorChanged(SensorEvent event) {
		if (mRegistered) {
		mLastSensorValue = (int) event.values[0];
		}
		}

		@Override
		public void onAccuracyChanged(Sensor sensor, int accuracy) {
		}

		void setLightSensorEnabled(boolean enabled) {
		if (enabled && !mRegistered) {
		// Wait until we get an event from the sensor indicating ready.
		mRegistered = mSensorManager.registerListener(this, mLightSensor,
		SensorManager.SENSOR_DELAY_NORMAL, mHandler);
		mLastSensorValue = SENSOR_INVALID_VALUE;
		} else if (!enabled && mRegistered) {
		mSensorManager.unregisterListener(this);
		mRegistered = false;
		mSensorDisableTime = mClock.uptimeMillis();
		}
		}

		float getAutomaticScreenBrightness() {
		if (mLastSensorValue < 0 \|\| mLastSensorValue >= mSensorValueToLux.length
		\|\| (!mRegistered
		&& mClock.uptimeMillis() - mSensorDisableTime > SENSOR_VALUE_VALID_TIME_MILLIS)) {
		return PowerManager.BRIGHTNESS_INVALID_FLOAT;
		}

		int lux = mSensorValueToLux[mLastSensorValue];
		if (lux < 0) {
		return PowerManager.BRIGHTNESS_INVALID_FLOAT;
		}

		return mBrightnessMapper.getBrightness(lux);
		}

		/** Dump current state */
		public void dump(PrintWriter pw) {
		pw.println("ScreenOffBrightnessSensorController:");
		IndentingPrintWriter idpw = new IndentingPrintWriter(pw);
		idpw.increaseIndent();
		idpw.println("registered=" + mRegistered);
		idpw.println("lastSensorValue=" + mLastSensorValue);
		}

		/** Functional interface for providing time. */
		@VisibleForTesting
		interface Clock {
		/**
		* Returns current time in milliseconds since boot, not counting time spent in deep sleep.
		*/
		long uptimeMillis();
		}
		}

services/core/java/com/android/server/display/brightness/BrightnessReason.java

+4 −1

Original line number	Diff line number	Diff line
		@@ -37,7 +37,8 @@ public final class BrightnessReason {
		public static final int REASON_OVERRIDE = 6;
		public static final int REASON_TEMPORARY = 7;
		public static final int REASON_BOOST = 8;
		public static final int REASON_MAX = REASON_BOOST;
		public static final int REASON_SCREEN_OFF_BRIGHTNESS_SENSOR = 9;
		public static final int REASON_MAX = REASON_SCREEN_OFF_BRIGHTNESS_SENSOR;

		public static final int MODIFIER_DIMMED = 0x1;
		public static final int MODIFIER_LOW_POWER = 0x2;
		@@ -190,6 +191,8 @@ public final class BrightnessReason {
		return "temporary";
		case REASON_BOOST:
		return "boost";
		case REASON_SCREEN_OFF_BRIGHTNESS_SENSOR:
		return "screen_off_brightness_sensor";
		default:
		return Integer.toString(reason);
		}