| /* |
| * Copyright (C) 2018 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.power.batterysaver; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.ContentObserver; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| import android.provider.Settings.Global; |
| import android.util.Slog; |
| import android.util.proto.ProtoOutputStream; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.os.BackgroundThread; |
| import com.android.server.power.BatterySaverPolicy; |
| import com.android.server.power.BatterySaverStateMachineProto; |
| |
| import java.io.PrintWriter; |
| |
| /** |
| * Decides when to enable / disable battery saver. |
| * |
| * (n.b. This isn't really implemented as a "state machine" though.) |
| * |
| * Test: |
| atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/batterysaver/BatterySaverStateMachineTest.java |
| */ |
| public class BatterySaverStateMachine { |
| private static final String TAG = "BatterySaverStateMachine"; |
| private final Object mLock = new Object(); |
| |
| private static final boolean DEBUG = BatterySaverPolicy.DEBUG; |
| |
| private final Context mContext; |
| private final BatterySaverController mBatterySaverController; |
| |
| /** Whether the system has booted. */ |
| @GuardedBy("mLock") |
| private boolean mBootCompleted; |
| |
| /** Whether global settings have been loaded already. */ |
| @GuardedBy("mLock") |
| private boolean mSettingsLoaded; |
| |
| /** Whether the first battery status has arrived. */ |
| @GuardedBy("mLock") |
| private boolean mBatteryStatusSet; |
| |
| /** Whether the device is connected to any power source. */ |
| @GuardedBy("mLock") |
| private boolean mIsPowered; |
| |
| /** Current battery level in %, 0-100. (Currently only used in dumpsys.) */ |
| @GuardedBy("mLock") |
| private int mBatteryLevel; |
| |
| /** Whether the battery level is considered to be "low" or not.*/ |
| @GuardedBy("mLock") |
| private boolean mIsBatteryLevelLow; |
| |
| /** Previously known value of Global.LOW_POWER_MODE. */ |
| @GuardedBy("mLock") |
| private boolean mSettingBatterySaverEnabled; |
| |
| /** Previously known value of Global.LOW_POWER_MODE_STICKY. */ |
| @GuardedBy("mLock") |
| private boolean mSettingBatterySaverEnabledSticky; |
| |
| /** |
| * Previously known value of Global.LOW_POWER_MODE_TRIGGER_LEVEL. |
| * (Currently only used in dumpsys.) |
| */ |
| @GuardedBy("mLock") |
| private int mSettingBatterySaverTriggerThreshold; |
| |
| /** |
| * Whether BS has been manually disabled while the battery level is low, in which case we |
| * shouldn't auto re-enable it until the battery level is not low. |
| */ |
| @GuardedBy("mLock") |
| private boolean mBatterySaverSnoozing; |
| |
| private final ContentObserver mSettingsObserver = new ContentObserver(null) { |
| @Override |
| public void onChange(boolean selfChange) { |
| synchronized (mLock) { |
| refreshSettingsLocked(); |
| } |
| } |
| }; |
| |
| public BatterySaverStateMachine( |
| Context context, BatterySaverController batterySaverController) { |
| mContext = context; |
| mBatterySaverController = batterySaverController; |
| } |
| |
| private boolean isBatterySaverEnabled() { |
| return mBatterySaverController.isEnabled(); |
| } |
| |
| private boolean isAutoBatterySaverConfigured() { |
| return mSettingBatterySaverTriggerThreshold > 0; |
| } |
| |
| /** |
| * {@link com.android.server.power.PowerManagerService} calls it when the system is booted. |
| */ |
| public void onBootCompleted() { |
| if (DEBUG) { |
| Slog.d(TAG, "onBootCompleted"); |
| } |
| // This is called with the power manager lock held. Don't do any |
| runOnBgThread(() -> { |
| synchronized (mLock) { |
| |
| final ContentResolver cr = mContext.getContentResolver(); |
| cr.registerContentObserver(Settings.Global.getUriFor( |
| Settings.Global.LOW_POWER_MODE), |
| false, mSettingsObserver, UserHandle.USER_SYSTEM); |
| cr.registerContentObserver(Settings.Global.getUriFor( |
| Settings.Global.LOW_POWER_MODE_STICKY), |
| false, mSettingsObserver, UserHandle.USER_SYSTEM); |
| cr.registerContentObserver(Settings.Global.getUriFor( |
| Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL), |
| false, mSettingsObserver, UserHandle.USER_SYSTEM); |
| |
| mBootCompleted = true; |
| |
| refreshSettingsLocked(); |
| |
| doAutoBatterySaverLocked(); |
| } |
| }); |
| } |
| |
| @VisibleForTesting |
| void runOnBgThread(Runnable r) { |
| BackgroundThread.getHandler().post(r); |
| } |
| |
| void refreshSettingsLocked() { |
| final ContentResolver cr = mContext.getContentResolver(); |
| |
| final boolean lowPowerModeEnabled = getGlobalSetting( |
| Settings.Global.LOW_POWER_MODE, 0) != 0; |
| final boolean lowPowerModeEnabledSticky = getGlobalSetting( |
| Settings.Global.LOW_POWER_MODE_STICKY, 0) != 0; |
| final int lowPowerModeTriggerLevel = getGlobalSetting( |
| Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0); |
| |
| setSettingsLocked(lowPowerModeEnabled, lowPowerModeEnabledSticky, |
| lowPowerModeTriggerLevel); |
| } |
| |
| /** |
| * {@link com.android.server.power.PowerManagerService} calls it when relevant global settings |
| * have changed. |
| * |
| * Note this will be called before {@link #onBootCompleted} too. |
| */ |
| @VisibleForTesting |
| void setSettingsLocked(boolean batterySaverEnabled, boolean batterySaverEnabledSticky, |
| int batterySaverTriggerThreshold) { |
| if (DEBUG) { |
| Slog.d(TAG, "setSettings: enabled=" + batterySaverEnabled |
| + " sticky=" + batterySaverEnabledSticky |
| + " threshold=" + batterySaverTriggerThreshold); |
| } |
| |
| mSettingsLoaded = true; |
| |
| final boolean enabledChanged = mSettingBatterySaverEnabled != batterySaverEnabled; |
| final boolean stickyChanged = |
| mSettingBatterySaverEnabledSticky != batterySaverEnabledSticky; |
| final boolean thresholdChanged |
| = mSettingBatterySaverTriggerThreshold != batterySaverTriggerThreshold; |
| |
| if (!(enabledChanged || stickyChanged || thresholdChanged)) { |
| return; |
| } |
| |
| mSettingBatterySaverEnabled = batterySaverEnabled; |
| mSettingBatterySaverEnabledSticky = batterySaverEnabledSticky; |
| mSettingBatterySaverTriggerThreshold = batterySaverTriggerThreshold; |
| |
| if (enabledChanged) { |
| final String reason = batterySaverEnabled |
| ? "Global.low_power changed to 1" : "Global.low_power changed to 0"; |
| enableBatterySaverLocked(/*enable=*/ batterySaverEnabled, /*manual=*/ true, |
| reason); |
| } |
| } |
| |
| /** |
| * {@link com.android.server.power.PowerManagerService} calls it when battery state changes. |
| * |
| * Note this may be called before {@link #onBootCompleted} too. |
| */ |
| public void setBatteryStatus(boolean newPowered, int newLevel, boolean newBatteryLevelLow) { |
| if (DEBUG) { |
| Slog.d(TAG, "setBatteryStatus: powered=" + newPowered + " level=" + newLevel |
| + " low=" + newBatteryLevelLow); |
| } |
| synchronized (mLock) { |
| mBatteryStatusSet = true; |
| |
| final boolean poweredChanged = mIsPowered != newPowered; |
| final boolean levelChanged = mBatteryLevel != newLevel; |
| final boolean lowChanged = mIsBatteryLevelLow != newBatteryLevelLow; |
| |
| if (!(poweredChanged || levelChanged || lowChanged)) { |
| return; |
| } |
| |
| mIsPowered = newPowered; |
| mBatteryLevel = newLevel; |
| mIsBatteryLevelLow = newBatteryLevelLow; |
| |
| doAutoBatterySaverLocked(); |
| } |
| } |
| |
| /** |
| * Decide whether to auto-start / stop battery saver. |
| */ |
| private void doAutoBatterySaverLocked() { |
| if (DEBUG) { |
| Slog.d(TAG, "doAutoBatterySaverLocked: mBootCompleted=" + mBootCompleted |
| + " mSettingsLoaded=" + mSettingsLoaded |
| + " mBatteryStatusSet=" + mBatteryStatusSet |
| + " mIsBatteryLevelLow=" + mIsBatteryLevelLow |
| + " mBatterySaverSnoozing=" + mBatterySaverSnoozing |
| + " mIsPowered=" + mIsPowered |
| + " mSettingBatterySaverEnabledSticky=" + mSettingBatterySaverEnabledSticky); |
| } |
| if (!(mBootCompleted && mSettingsLoaded && mBatteryStatusSet)) { |
| return; // Not fully initialized yet. |
| } |
| if (!mIsBatteryLevelLow) { |
| updateSnoozingLocked(false, "Battery not low"); |
| } |
| if (mIsPowered) { |
| updateSnoozingLocked(false, "Plugged in"); |
| enableBatterySaverLocked(/*enable=*/ false, /*manual=*/ false, "Plugged in"); |
| |
| } else if (mSettingBatterySaverEnabledSticky) { |
| // Re-enable BS. |
| enableBatterySaverLocked(/*enable=*/ true, /*manual=*/ true, "Sticky restore"); |
| |
| } else if (mIsBatteryLevelLow) { |
| if (!mBatterySaverSnoozing && isAutoBatterySaverConfigured()) { |
| enableBatterySaverLocked(/*enable=*/ true, /*manual=*/ false, "Auto ON"); |
| } |
| } else { // Battery not low |
| enableBatterySaverLocked(/*enable=*/ false, /*manual=*/ false, "Auto OFF"); |
| } |
| } |
| |
| /** |
| * {@link com.android.server.power.PowerManagerService} calls it when |
| * {@link android.os.PowerManager#setPowerSaveMode} is called. |
| * |
| * Note this could? be called before {@link #onBootCompleted} too. |
| */ |
| public void setBatterySaverEnabledManually(boolean enabled) { |
| if (DEBUG) { |
| Slog.d(TAG, "setBatterySaverEnabledManually: enabled=" + enabled); |
| } |
| synchronized (mLock) { |
| enableBatterySaverLocked(/*enable=*/ enabled, /*manual=*/ true, |
| (enabled ? "Manual ON" : "Manual OFF")); |
| } |
| } |
| |
| /** |
| * Actually enable / disable battery saver. Write the new state to the global settings |
| * and propagate it to {@link #mBatterySaverController}. |
| */ |
| private void enableBatterySaverLocked(boolean enable, boolean manual, String reason) { |
| if (DEBUG) { |
| Slog.d(TAG, "enableBatterySaver: enable=" + enable + " manual=" + manual |
| + " reason=" + reason); |
| } |
| final boolean wasEnabled = mBatterySaverController.isEnabled(); |
| |
| if (wasEnabled == enable) { |
| if (DEBUG) { |
| Slog.d(TAG, "Already " + (enable ? "enabled" : "disabled")); |
| } |
| return; |
| } |
| if (enable && mIsPowered) { |
| if (DEBUG) Slog.d(TAG, "Can't enable: isPowered"); |
| return; |
| } |
| |
| if (manual) { |
| if (enable) { |
| updateSnoozingLocked(false, "Manual snooze OFF"); |
| } else { |
| // When battery saver is disabled manually (while battery saver is enabled) |
| // when the battery level is low, we "snooze" BS -- i.e. disable auto battery saver. |
| // We resume auto-BS once the battery level is not low, or the device is plugged in. |
| if (isBatterySaverEnabled() && mIsBatteryLevelLow) { |
| updateSnoozingLocked(true, "Manual snooze"); |
| } |
| } |
| } |
| |
| mSettingBatterySaverEnabled = enable; |
| putGlobalSetting(Global.LOW_POWER_MODE, enable ? 1 : 0); |
| |
| if (manual) { |
| mSettingBatterySaverEnabledSticky = enable; |
| putGlobalSetting(Global.LOW_POWER_MODE_STICKY, enable ? 1 : 0); |
| } |
| mBatterySaverController.enableBatterySaver(enable); |
| |
| if (DEBUG) { |
| Slog.d(TAG, "Battery saver: Enabled=" + enable |
| + " manual=" + manual |
| + " reason=" + reason); |
| } |
| } |
| |
| private void updateSnoozingLocked(boolean snoozing, String reason) { |
| if (mBatterySaverSnoozing == snoozing) { |
| return; |
| } |
| if (DEBUG) Slog.d(TAG, "Snooze: " + (snoozing ? "start" : "stop") + " reason=" + reason); |
| mBatterySaverSnoozing = snoozing; |
| } |
| |
| @VisibleForTesting |
| protected void putGlobalSetting(String key, int value) { |
| Global.putInt(mContext.getContentResolver(), key, value); |
| } |
| |
| @VisibleForTesting |
| protected int getGlobalSetting(String key, int defValue) { |
| return Global.getInt(mContext.getContentResolver(), key, defValue); |
| } |
| |
| public void dump(PrintWriter pw) { |
| synchronized (mLock) { |
| pw.println(); |
| pw.println("Battery saver state machine:"); |
| |
| pw.print(" Enabled="); |
| pw.println(mBatterySaverController.isEnabled()); |
| |
| pw.print(" mBootCompleted="); |
| pw.println(mBootCompleted); |
| pw.print(" mSettingsLoaded="); |
| pw.println(mSettingsLoaded); |
| pw.print(" mBatteryStatusSet="); |
| pw.println(mBatteryStatusSet); |
| |
| pw.print(" mBatterySaverSnoozing="); |
| pw.println(mBatterySaverSnoozing); |
| |
| pw.print(" mIsPowered="); |
| pw.println(mIsPowered); |
| pw.print(" mBatteryLevel="); |
| pw.println(mBatteryLevel); |
| pw.print(" mIsBatteryLevelLow="); |
| pw.println(mIsBatteryLevelLow); |
| |
| pw.print(" mSettingBatterySaverEnabled="); |
| pw.println(mSettingBatterySaverEnabled); |
| pw.print(" mSettingBatterySaverEnabledSticky="); |
| pw.println(mSettingBatterySaverEnabledSticky); |
| pw.print(" mSettingBatterySaverTriggerThreshold="); |
| pw.println(mSettingBatterySaverTriggerThreshold); |
| } |
| } |
| |
| public void dumpProto(ProtoOutputStream proto, long tag) { |
| synchronized (mLock) { |
| final long token = proto.start(tag); |
| |
| proto.write(BatterySaverStateMachineProto.ENABLED, |
| mBatterySaverController.isEnabled()); |
| |
| proto.write(BatterySaverStateMachineProto.BOOT_COMPLETED, mBootCompleted); |
| proto.write(BatterySaverStateMachineProto.SETTINGS_LOADED, mSettingsLoaded); |
| proto.write(BatterySaverStateMachineProto.BATTERY_STATUS_SET, mBatteryStatusSet); |
| |
| proto.write(BatterySaverStateMachineProto.BATTERY_SAVER_SNOOZING, |
| mBatterySaverSnoozing); |
| |
| proto.write(BatterySaverStateMachineProto.IS_POWERED, mIsPowered); |
| proto.write(BatterySaverStateMachineProto.BATTERY_LEVEL, mBatteryLevel); |
| proto.write(BatterySaverStateMachineProto.IS_BATTERY_LEVEL_LOW, mIsBatteryLevelLow); |
| |
| proto.write(BatterySaverStateMachineProto.SETTING_BATTERY_SAVER_ENABLED, |
| mSettingBatterySaverEnabled); |
| proto.write(BatterySaverStateMachineProto.SETTING_BATTERY_SAVER_ENABLED_STICKY, |
| mSettingBatterySaverEnabledSticky); |
| proto.write(BatterySaverStateMachineProto.SETTING_BATTERY_SAVER_TRIGGER_THRESHOLD, |
| mSettingBatterySaverTriggerThreshold); |
| |
| proto.end(token); |
| } |
| } |
| } |