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      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.server.broadcastradio;
     18 
     19 import android.Manifest;
     20 import android.content.Context;
     21 import android.content.pm.PackageManager;
     22 import android.hardware.radio.IRadioService;
     23 import android.hardware.radio.ITuner;
     24 import android.hardware.radio.ITunerCallback;
     25 import android.hardware.radio.RadioManager;
     26 import android.os.ParcelableException;
     27 
     28 import com.android.server.SystemService;
     29 
     30 import java.util.List;
     31 
     32 public class BroadcastRadioService extends SystemService {
     33     private final ServiceImpl mServiceImpl = new ServiceImpl();
     34 
     35     /**
     36      * This field is used by native code, do not access or modify.
     37      */
     38     private final long mNativeContext = nativeInit();
     39 
     40     private final Object mLock = new Object();
     41     private List<RadioManager.ModuleProperties> mModules = null;
     42 
     43     public BroadcastRadioService(Context context) {
     44         super(context);
     45     }
     46 
     47     @Override
     48     protected void finalize() throws Throwable {
     49         nativeFinalize(mNativeContext);
     50         super.finalize();
     51     }
     52 
     53     private native long nativeInit();
     54     private native void nativeFinalize(long nativeContext);
     55     private native List<RadioManager.ModuleProperties> nativeLoadModules(long nativeContext);
     56     private native Tuner nativeOpenTuner(long nativeContext, int moduleId,
     57             RadioManager.BandConfig config, boolean withAudio, ITunerCallback callback);
     58 
     59     @Override
     60     public void onStart() {
     61         publishBinderService(Context.RADIO_SERVICE, mServiceImpl);
     62     }
     63 
     64     private class ServiceImpl extends IRadioService.Stub {
     65         private void enforcePolicyAccess() {
     66             if (PackageManager.PERMISSION_GRANTED != getContext().checkCallingPermission(
     67                     Manifest.permission.ACCESS_BROADCAST_RADIO)) {
     68                 throw new SecurityException("ACCESS_BROADCAST_RADIO permission not granted");
     69             }
     70         }
     71 
     72         @Override
     73         public List<RadioManager.ModuleProperties> listModules() {
     74             enforcePolicyAccess();
     75             synchronized (mLock) {
     76                 if (mModules != null) return mModules;
     77 
     78                 mModules = nativeLoadModules(mNativeContext);
     79                 if (mModules == null) {
     80                     throw new ParcelableException(new NullPointerException(
     81                             "couldn't load radio modules"));
     82                 }
     83 
     84                 return mModules;
     85             }
     86         }
     87 
     88         @Override
     89         public ITuner openTuner(int moduleId, RadioManager.BandConfig bandConfig,
     90                 boolean withAudio, ITunerCallback callback) {
     91             enforcePolicyAccess();
     92             if (callback == null) {
     93                 throw new IllegalArgumentException("Callback must not be empty");
     94             }
     95             synchronized (mLock) {
     96                 return nativeOpenTuner(mNativeContext, moduleId, bandConfig, withAudio, callback);
     97             }
     98         }
     99     }
    100 }
    101