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/*
* 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);
}
}
}
}
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