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 17 package com.android.internal.car; 18 19 import android.content.ComponentName; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.ServiceConnection; 23 import android.os.Binder; 24 import android.os.IBinder; 25 import android.os.Parcel; 26 import android.os.RemoteException; 27 import android.os.UserHandle; 28 import android.util.Slog; 29 30 import com.android.server.SystemService; 31 import 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 */ 37 public 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 CarServiceHelperService(Context context)70 public CarServiceHelperService(Context context) { 71 super(context); 72 mContext = context; 73 } 74 75 @Override onStart()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 handleCarServiceCrash()87 private void handleCarServiceCrash() { 88 //TODO define recovery bahavior 89 } 90 nativeForceSuspend(int timeoutMs)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 forceSuspend(int timeoutMs)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