1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.internal.car;
18
19import android.content.ComponentName;
20import android.content.Context;
21import android.content.Intent;
22import android.content.ServiceConnection;
23import android.os.Binder;
24import android.os.IBinder;
25import android.os.Parcel;
26import android.os.RemoteException;
27import android.os.UserHandle;
28import android.util.Slog;
29
30import com.android.server.SystemService;
31import com.android.internal.car.ICarServiceHelper;
32
33/**
34 * System service side companion service for CarService.
35 * Starts car service and provide necessary API for CarService. Only for car product.
36 */
37public class CarServiceHelperService extends SystemService {
38    private static final String TAG = "CarServiceHelper";
39    private static final String CAR_SERVICE_INTERFACE = "android.car.ICar";
40    private final ICarServiceHelperImpl mHelper = new ICarServiceHelperImpl();
41    private final Context mContext;
42    private IBinder mCarService;
43    private final ServiceConnection mCarServiceConnection = new ServiceConnection() {
44
45        @Override
46        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
47            Slog.i(TAG, "**CarService connected**");
48            mCarService = iBinder;
49            // Cannot depend on ICar which is defined in CarService, so handle binder call directly
50            // instead.
51            // void setCarServiceHelper(in IBinder helper)
52            Parcel data = Parcel.obtain();
53            data.writeInterfaceToken(CAR_SERVICE_INTERFACE);
54            data.writeStrongBinder(mHelper.asBinder());
55            try {
56                mCarService.transact(IBinder.FIRST_CALL_TRANSACTION, // setCarServiceHelper
57                        data, null, Binder.FLAG_ONEWAY);
58            } catch (RemoteException e) {
59                Slog.w(TAG, "RemoteException from car service", e);
60                handleCarServiceCrash();
61            }
62        }
63
64        @Override
65        public void onServiceDisconnected(ComponentName componentName) {
66            handleCarServiceCrash();
67        }
68    };
69
70    public CarServiceHelperService(Context context) {
71        super(context);
72        mContext = context;
73    }
74
75    @Override
76    public void onStart() {
77        Intent intent = new Intent();
78        intent.setPackage("com.android.car");
79        intent.setAction(CAR_SERVICE_INTERFACE);
80        if (!getContext().bindServiceAsUser(intent, mCarServiceConnection, Context.BIND_AUTO_CREATE,
81                UserHandle.SYSTEM)) {
82            Slog.wtf(TAG, "cannot start car service");
83        }
84        System.loadLibrary("car-framework-service-jni");
85    }
86
87    private void handleCarServiceCrash() {
88        //TODO define recovery bahavior
89    }
90
91    private static native int nativeForceSuspend(int timeoutMs);
92
93    private class ICarServiceHelperImpl extends ICarServiceHelper.Stub {
94       /**
95         * Force device to suspend
96         *
97         * @param timeoutMs
98         */
99        @Override // Binder call
100        public int forceSuspend(int timeoutMs) {
101            int retVal;
102            mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DEVICE_POWER, null);
103            final long ident = Binder.clearCallingIdentity();
104            try {
105                retVal = nativeForceSuspend(timeoutMs);
106            } finally {
107                Binder.restoreCallingIdentity(ident);
108            }
109            return retVal;
110        }
111    }
112}
113