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Commit a1810eff authored by Steve Kondik's avatar Steve Kondik
Browse files

power: Add panel auto-brightness configuration 

 * Some panel hardware requires that we twiddle some knobs in sysfs to
   enable proper display calibration (gamma, etc) when auto-brightness
   is enabled. Add a configuration value to handle this.

Change-Id: I3c793c3520fc6f9a18d5a3abf1fe0df803c5e580
parent 93df8a71

core/res/res/values/config.xml

+4 −0
Original line number Diff line number Diff line
@@ -1129,4 +1129,8 @@ 


    <!-- Boolean to enable Stylus gestures -->

    <bool name="config_stylusGestures">false</bool>



    <!-- Integer to configure panel auto brightness mode when changed -->

    <integer name="config_panelAutoBrightnessValue">-1</integer>



</resources>

core/res/res/values/symbols.xml

+3 −0
Original line number Diff line number Diff line
@@ -1934,6 +1934,9 @@ 
  <java-symbol type="bool" name="config_stylusGestures" />

  <java-symbol type="string" name="stylus_app_not_installed" />



  <!-- Panel auto brightness -->

  <java-symbol type="integer" name="config_panelAutoBrightnessValue" />



  <!-- Options that show upon long-pressing a key on the physical keyboard -->

  <java-symbol type="string" name="symbol_picker_0" />

  <java-symbol type="string" name="symbol_picker_1" />

services/java/com/android/server/power/AutoBrightnessHandler.java

0 → 100644
+72 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2013 The CyanogenMod 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.power;



import android.content.Context;

import android.os.SystemProperties;

import android.provider.Settings;



import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;



/**

 * Certain display devices require that we set a special mode when enabling auto-brightness.

 * This is done by setting a sysfs node. This behavior can be configured by setting the

 * config_panelAutoBrightnessValue to the integer value to write when enabled.

 *

 * Some high-end panels might support alternative brightness modes such as high gamma. This

 * is highly device-specific, but we will support these via a persistent system property.

 *

 * @hide

 */

public class AutoBrightnessHandler {



    private static final String NODE = "/sys/class/lcd/panel/panel/auto_brightness";



    private static final String ALT_BRIGHTNESS_PROP = "persist.sys.alt.brightness";



    private static final int PANEL_MANUAL = 0;



    private final int mPanelAutoValue;



    public AutoBrightnessHandler(Context context) {

        mPanelAutoValue = context.getResources().getInteger(

                com.android.internal.R.integer.config_panelAutoBrightnessValue);

    }



    public void onAutoBrightnessChanged(int mode) {

        if (mPanelAutoValue > -1) {

            int override = SystemProperties.getInt(ALT_BRIGHTNESS_PROP, -1);

            writeValue(NODE, mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC ?

                    (override > -1 ? override : mPanelAutoValue) : PANEL_MANUAL);

        }

    }



    private static void writeValue(String filename, int value) {

        try {

            FileOutputStream fos = new FileOutputStream(new File(filename));

            fos.write(String.valueOf(value).getBytes());

            fos.flush();

            fos.close();

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

services/java/com/android/server/power/PowerManagerService.java

+9 −0
Original line number Diff line number Diff line
@@ -183,6 +183,7 @@ public final class PowerManagerService extends IPowerManager.Stub 
    private WirelessChargerDetector mWirelessChargerDetector;

    private SettingsObserver mSettingsObserver;

    private DreamManagerService mDreamManager;

    private AutoBrightnessHandler mAutoBrightnessHandler;

    private LightsService.Light mAttentionLight;

    private LightsService.Light mButtonsLight;

    private LightsService.Light mKeyboardLight;
@@ -418,6 +419,9 @@ public final class PowerManagerService extends IPowerManager.Stub 
        // activity manager is not running when the constructor is called, so we

        // have to defer setting the screen state until this point.

        mDisplayBlanker.unblankAllDisplays();



        mAutoBrightnessHandler = new AutoBrightnessHandler(context);



    }



    public void setPolicy(WindowManagerPolicy policy) {
@@ -567,9 +571,14 @@ public final class PowerManagerService extends IPowerManager.Stub 
            mTemporaryScreenAutoBrightnessAdjustmentSettingOverride = Float.NaN;

        }



        final int oldScreenBrightnessModeSetting =

                mScreenBrightnessModeSetting;

        mScreenBrightnessModeSetting = Settings.System.getIntForUser(resolver,

                Settings.System.SCREEN_BRIGHTNESS_MODE,

                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL, UserHandle.USER_CURRENT);

        if (oldScreenBrightnessModeSetting != mScreenBrightnessModeSetting) {

            mAutoBrightnessHandler.onAutoBrightnessChanged(mScreenBrightnessModeSetting);

        }



        mDirty |= DIRTY_SETTINGS;

    }