0. 前言

1. 上接展訊Sprd設定-電池-setPowerSaveMode

• https://blog.csdn.net/su749520/article/details/83183634

2. 3 展訊Sprd設定-電池-onPowerSaveModeChanging介面

• https://blog.csdn.net/su749520/article/details/83273432

原始碼走讀的開始位置

• vendor/sprd/platform/frameworks/base/services/core/java/com/android/server/power/PowerController.java

1. PowerController.handlePowerSaveModeChanged

package com.android.server.power;

public class PowerController //extends IPowerController.Stub

    private List<PowerSaveHelper> mHelpers;

    // handle the power save mode changed
    private void handlePowerSaveModeChanged(int newMode) {

        if (mInitFinished && mPowerSaveMode == newMode) return;

        // notify helpers power save mode changing
        for (int i = 0; i < mHelpers.size(); i++) {
            PowerSaveHelper helper = mHelpers.get(i);
            helper.onPowerSaveModeChanging(newMode);
        }

        exitPowerSaveMode(mPowerSaveMode);
        enterPowerSaveMode(newMode);
        if (mPowerSaveMode != newMode) {
            Slog.e(TAG, "Something error!! mPowerSaveMode change fail!!old mode:" + mPowerSaveMode
                + " new mode:" + newMode);
        }

        // notify helpers power save mode changed
        for (int i = 0; i < mHelpers.size(); i++) {
            PowerSaveHelper helper = mHelpers.get(i);
            helper.onPowerSaveModeChanged(newMode);
        }

    }
 

2. PowerController.exitPowerSaveMode

呼叫 exitPowerSaveMode 主要目的是設定 DeviceIdleController.forceDoze(false, true) 進入doze模式的介面

    private void exitPowerSaveMode(int oldMode) {
        switch (oldMode) {
            case PowerManagerEx.MODE_LOWPOWER: // 省電模式
            case PowerManagerEx.MODE_ULTRASAVING: // 超級省電模式
            case PowerManagerEx.MODE_INVALID: // default mode is MODE_INVALID, so it must be the first time coming here. We should do reset lowpower mode
                // Google 原生的省電模式，這裡禁用這個模式
                mPowerManager.setPowerSaveMode(false);
                exitForceIdleIfNeed();
                break;
            case PowerManagerEx.MODE_PERFORMANCE:
                break;
            case PowerManagerEx.MODE_SMART: // 智慧省電模式
                 if (!mDozeEnabled) {
                    exitForceIdleIfNeed();
                 }
                break;
            case PowerManagerEx.MODE_POWERSAVING:
                break;
        }
    }
 

3. PowerController.exitForceIdleIfNeed

package com.android.server.power;

public class PowerController //extends IPowerController.Stub
	extends UsageStatsManagerInternal.AppStateEventChangeListener {

    private DeviceIdleController.LocalService mLocalDeviceIdleController;


    private void exitForceIdleIfNeed() {
        if (mForceIdle) {
            if (mLocalDeviceIdleController != null)
                // forceDoze(是否進入強制進入doze模式，是否強制進入deep doze模式)
                mLocalDeviceIdleController.forceDoze(false, true);
            mForceIdle = false;
        }
    }

4. DeviceIdleController.forceDoze

• frameworks/base/services/core/java/com/android/server/DeviceIdleController.java

後續自己模組的省電管理科員借鑑下，進行強制進入省電模式

/**
 * Keeps track of device idleness and drives low power mode based on that.
 */
public class DeviceIdleController extends SystemService
        implements AnyMotionDetector.DeviceIdleCallback {
    private static final String TAG = "DeviceIdleController";

    private final PowerControllerHelper mPowerControllerHelper;

    public class LocalService {
        // duration in milliseconds

        public boolean forceDoze(boolean enable, boolean bDeep) {
            return mPowerControllerHelper.forceDoze(enable, bDeep);
        }

5. PowerControllerHelper.forceDoze()介面

/**
 * Keeps track of device idleness and drives low power mode based on that.
 */
public class DeviceIdleController extends SystemService
        implements AnyMotionDetector.DeviceIdleCallback {
    private static final String TAG = "DeviceIdleController";
    
    private final PowerControllerHelper mPowerControllerHelper;

    // impletement functions that need for PowerController
    private final class PowerControllerHelper {

        public boolean forceDoze(boolean enable, boolean bDeep) {
            synchronized (this) {
                if (enable) { // force doze
                    if (bDeep) { // force deep doze
                        mForceIdle = true;
                        forceBecomeInactiveIfAppropriateLocked();
                        int curState = mState;
                        while (curState != STATE_IDLE) {
                            stepIdleStateLocked("s:force");
                            if (curState == mState) {
                                Slog.w(TAG, "Unable to go deep idle; stopped at " + stateToString(mState));
                                exitForceIdleLocked();
                                return false;
                            }
                            curState = mState;
                        }
                        Slog.w(TAG, "Now forced in to deep idle mode");
                    } else { // force light doze
                        mForceIdle = true;
                        forceBecomeInactiveIfAppropriateLocked();
                        int curLightState = mLightState;
                        while (curLightState != LIGHT_STATE_IDLE) {
                            stepLightIdleStateLocked("s:force");
                            if (curLightState == mLightState) {
                                Slog.w(TAG, "Unable to go light idle; stopped at " + lightStateToString(mLightState));
                                exitForceIdleLocked();
                                return false;
                            }
                            curLightState = mLightState;
                        }
                        Slog.w(TAG, "Now forced in to light idle mode");
                    }
                } else { // unforce doze ( whether light or deep)
                        exitForceIdleIgnoreDeviceStateLocked();
                        Slog.w(TAG, "Light state: " + lightStateToString(mLightState));
                        Slog.w(TAG, "deep state: " + stateToString(mState));
                }
            }
            return true;
        }