1 /* 2 * Copyright (C) 2016 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.wifi.aware; 18 19 import android.hardware.wifi.V1_0.IWifiNanIface; 20 import android.hardware.wifi.V1_0.IfaceType; 21 import android.hardware.wifi.V1_0.WifiStatus; 22 import android.hardware.wifi.V1_0.WifiStatusCode; 23 import android.os.RemoteException; 24 import android.util.Log; 25 26 import com.android.internal.annotations.VisibleForTesting; 27 import com.android.server.wifi.HalDeviceManager; 28 29 import java.io.FileDescriptor; 30 import java.io.PrintWriter; 31 32 /** 33 * Manages the interface to Wi-Fi Aware HIDL (HAL). 34 */ 35 public class WifiAwareNativeManager { 36 private static final String TAG = "WifiAwareNativeManager"; 37 private static final boolean DBG = false; 38 39 // to be used for synchronizing access to any of the WifiAwareNative objects 40 private final Object mLock = new Object(); 41 42 private WifiAwareStateManager mWifiAwareStateManager; 43 private HalDeviceManager mHalDeviceManager; 44 private WifiAwareNativeCallback mWifiAwareNativeCallback; 45 private IWifiNanIface mWifiNanIface = null; 46 private InterfaceDestroyedListener mInterfaceDestroyedListener = 47 new InterfaceDestroyedListener(); 48 private InterfaceAvailableForRequestListener mInterfaceAvailableForRequestListener = 49 new InterfaceAvailableForRequestListener(); 50 51 WifiAwareNativeManager(WifiAwareStateManager awareStateManager, 52 HalDeviceManager halDeviceManager, 53 WifiAwareNativeCallback wifiAwareNativeCallback) { 54 mWifiAwareStateManager = awareStateManager; 55 mHalDeviceManager = halDeviceManager; 56 mWifiAwareNativeCallback = wifiAwareNativeCallback; 57 } 58 59 public void start() { 60 mHalDeviceManager.initialize(); 61 mHalDeviceManager.registerStatusListener( 62 new HalDeviceManager.ManagerStatusListener() { 63 @Override 64 public void onStatusChanged() { 65 if (DBG) Log.d(TAG, "onStatusChanged"); 66 // only care about isStarted (Wi-Fi started) not isReady - since if not 67 // ready then Wi-Fi will also be down. 68 if (mHalDeviceManager.isStarted()) { 69 // 1. no problem registering duplicates - only one will be called 70 // 2. will be called immediately if available 71 mHalDeviceManager.registerInterfaceAvailableForRequestListener( 72 IfaceType.NAN, mInterfaceAvailableForRequestListener, null); 73 } else { 74 awareIsDown(); 75 } 76 } 77 }, null); 78 if (mHalDeviceManager.isStarted()) { 79 mHalDeviceManager.registerInterfaceAvailableForRequestListener( 80 IfaceType.NAN, mInterfaceAvailableForRequestListener, null); 81 tryToGetAware(); 82 } 83 } 84 85 /** 86 * Returns the native HAL WifiNanIface through which commands to the NAN HAL are dispatched. 87 * Return may be null if not initialized/available. 88 */ 89 @VisibleForTesting 90 public IWifiNanIface getWifiNanIface() { 91 synchronized (mLock) { 92 return mWifiNanIface; 93 } 94 } 95 96 /** 97 * Attempt to obtain the HAL NAN interface. If available then enables Aware usage. 98 */ 99 private void tryToGetAware() { 100 synchronized (mLock) { 101 if (DBG) Log.d(TAG, "tryToGetAware: mWifiNanIface=" + mWifiNanIface); 102 103 if (mWifiNanIface != null) { 104 return; 105 } 106 IWifiNanIface iface = mHalDeviceManager.createNanIface(mInterfaceDestroyedListener, 107 null); 108 if (iface == null) { 109 if (DBG) Log.d(TAG, "Was not able to obtain an IWifiNanIface"); 110 } else { 111 if (DBG) Log.d(TAG, "Obtained an IWifiNanIface"); 112 113 try { 114 WifiStatus status = iface.registerEventCallback(mWifiAwareNativeCallback); 115 if (status.code != WifiStatusCode.SUCCESS) { 116 Log.e(TAG, "IWifiNanIface.registerEventCallback error: " + statusString( 117 status)); 118 mHalDeviceManager.removeIface(iface); 119 return; 120 } 121 } catch (RemoteException e) { 122 Log.e(TAG, "IWifiNanIface.registerEventCallback exception: " + e); 123 mHalDeviceManager.removeIface(iface); 124 return; 125 } 126 mWifiNanIface = iface; 127 mWifiAwareStateManager.enableUsage(); 128 } 129 } 130 } 131 132 private void awareIsDown() { 133 synchronized (mLock) { 134 if (DBG) Log.d(TAG, "awareIsDown: mWifiNanIface=" + mWifiNanIface); 135 if (mWifiNanIface != null) { 136 mWifiNanIface = null; 137 mWifiAwareStateManager.disableUsage(); 138 } 139 } 140 } 141 142 private class InterfaceDestroyedListener implements 143 HalDeviceManager.InterfaceDestroyedListener { 144 @Override 145 public void onDestroyed() { 146 if (DBG) Log.d(TAG, "Interface was destroyed"); 147 awareIsDown(); 148 } 149 } 150 151 private class InterfaceAvailableForRequestListener implements 152 HalDeviceManager.InterfaceAvailableForRequestListener { 153 @Override 154 public void onAvailableForRequest() { 155 if (DBG) Log.d(TAG, "Interface is possibly available"); 156 tryToGetAware(); 157 } 158 } 159 160 private static String statusString(WifiStatus status) { 161 if (status == null) { 162 return "status=null"; 163 } 164 StringBuilder sb = new StringBuilder(); 165 sb.append(status.code).append(" (").append(status.description).append(")"); 166 return sb.toString(); 167 } 168 169 /** 170 * Dump the internal state of the class. 171 */ 172 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 173 pw.println("WifiAwareNativeManager:"); 174 pw.println(" mWifiNanIface: " + mWifiNanIface); 175 mWifiAwareNativeCallback.dump(fd, pw, args); 176 mHalDeviceManager.dump(fd, pw, args); 177 } 178 } 179
