| /* |
| * Copyright (C) 2015 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; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.os.Binder; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.PowerManager; |
| import android.os.UEventObserver; |
| import android.os.UserHandle; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| |
| /** |
| * ThermalObserver for monitoring temperature changes. |
| */ |
| public class ThermalObserver extends SystemService { |
| private static final String TAG = "ThermalObserver"; |
| |
| private static final String CALLSTATE_UEVENT_MATCH = |
| "DEVPATH=/devices/virtual/switch/thermalstate"; |
| |
| private static final int MSG_THERMAL_STATE_CHANGED = 0; |
| |
| private static final int SWITCH_STATE_NORMAL = 0; |
| private static final int SWITCH_STATE_WARNING = 1; |
| private static final int SWITCH_STATE_EXCEEDED = 2; |
| |
| private final PowerManager mPowerManager; |
| private final PowerManager.WakeLock mWakeLock; |
| |
| private final Object mLock = new Object(); |
| private Integer mLastState; |
| |
| private final UEventObserver mThermalWarningObserver = new UEventObserver() { |
| @Override |
| public void onUEvent(UEventObserver.UEvent event) { |
| updateLocked(Integer.parseInt(event.get("SWITCH_STATE"))); |
| } |
| }; |
| |
| private final Handler mHandler = new Handler(true /*async*/) { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MSG_THERMAL_STATE_CHANGED: |
| handleThermalStateChange(msg.arg1); |
| mWakeLock.release(); |
| break; |
| } |
| } |
| }; |
| |
| public ThermalObserver(Context context) { |
| super(context); |
| mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE); |
| mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); |
| |
| mThermalWarningObserver.startObserving(CALLSTATE_UEVENT_MATCH); |
| } |
| |
| private void updateLocked(int state) { |
| Message message = new Message(); |
| message.what = MSG_THERMAL_STATE_CHANGED; |
| message.arg1 = state; |
| |
| mWakeLock.acquire(); |
| mHandler.sendMessage(message); |
| } |
| |
| private void handleThermalStateChange(int state) { |
| synchronized (mLock) { |
| mLastState = state; |
| Intent intent = new Intent(Intent.ACTION_THERMAL_EVENT); |
| intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING); |
| |
| final int thermalState; |
| |
| switch (state) { |
| case SWITCH_STATE_WARNING: |
| thermalState = Intent.EXTRA_THERMAL_STATE_WARNING; |
| break; |
| case SWITCH_STATE_EXCEEDED: |
| thermalState = Intent.EXTRA_THERMAL_STATE_EXCEEDED; |
| break; |
| case SWITCH_STATE_NORMAL: |
| default: |
| thermalState = Intent.EXTRA_THERMAL_STATE_NORMAL; |
| break; |
| } |
| |
| intent.putExtra(Intent.EXTRA_THERMAL_STATE, thermalState); |
| |
| getContext().sendBroadcastAsUser(intent, UserHandle.ALL); |
| } |
| } |
| |
| @Override |
| public void onStart() { |
| publishBinderService(TAG, new BinderService()); |
| } |
| |
| private final class BinderService extends Binder { |
| @Override |
| protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP) |
| != PackageManager.PERMISSION_GRANTED) { |
| pw.println("Permission Denial: can't dump thermal observer service from from pid=" |
| + Binder.getCallingPid() |
| + ", uid=" + Binder.getCallingUid()); |
| return; |
| } |
| |
| final long ident = Binder.clearCallingIdentity(); |
| try { |
| synchronized (mLock) { |
| if (args == null || args.length == 0 || "-a".equals(args[0])) { |
| pw.println("Current Thermal Observer Service state:"); |
| pw.println(" last state change: " |
| + (mLastState != null ? mLastState : "none")); |
| } |
| } |
| } finally { |
| Binder.restoreCallingIdentity(ident); |
| } |
| } |
| } |
| } |