1 /* 2 * Copyright (C) 2021 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.telephony; 18 19 import android.annotation.NonNull; 20 import android.os.AsyncResult; 21 import android.os.Handler; 22 import android.os.HandlerThread; 23 import android.os.Looper; 24 import android.os.Message; 25 import android.util.ArraySet; 26 import android.util.Log; 27 28 import com.android.internal.annotations.VisibleForTesting; 29 import com.android.internal.telephony.flags.Flags; 30 import com.android.internal.telephony.util.WorkerThread; 31 import com.android.telephony.Rlog; 32 33 import java.io.FileDescriptor; 34 import java.io.PrintWriter; 35 import java.util.Collections; 36 import java.util.Set; 37 38 /** 39 * Provides the capabilities that the Radio Interface supports on the current device. 40 */ 41 public class RadioInterfaceCapabilityController extends Handler { 42 private static final String LOG_TAG = 43 RadioInterfaceCapabilityController.class.getSimpleName(); 44 45 private static RadioInterfaceCapabilityController sInstance; 46 private final RadioConfig mRadioConfig; 47 private final CommandsInterface mCommandsInterface; 48 private Set<String> mRadioInterfaceCapabilities; 49 private final Object mLockRadioInterfaceCapabilities = new Object(); 50 private static final int EVENT_GET_HAL_DEVICE_CAPABILITIES_DONE = 100; 51 52 /** 53 * Init method to instantiate the object 54 * Should only be called once. 55 */ init(final RadioConfig radioConfig, final CommandsInterface commandsInterface)56 public static RadioInterfaceCapabilityController init(final RadioConfig radioConfig, 57 final CommandsInterface commandsInterface) { 58 synchronized (RadioInterfaceCapabilityController.class) { 59 if (sInstance == null) { 60 if (Flags.threadShred()) { 61 sInstance = new RadioInterfaceCapabilityController( 62 radioConfig, 63 commandsInterface, 64 WorkerThread.get().getLooper()); 65 } else { 66 final HandlerThread handlerThread = new HandlerThread("RHC"); 67 handlerThread.start(); 68 sInstance = new RadioInterfaceCapabilityController( 69 radioConfig, 70 commandsInterface, 71 handlerThread.getLooper()); 72 } 73 } else { 74 Log.wtf(LOG_TAG, "init() called multiple times! sInstance = " + sInstance); 75 } 76 return sInstance; 77 } 78 } 79 80 /** 81 * Static method to get instance. 82 */ getInstance()83 public static RadioInterfaceCapabilityController getInstance() { 84 if (sInstance == null) { 85 Log.wtf(LOG_TAG, "getInstance null"); 86 } 87 88 return sInstance; 89 } 90 91 @VisibleForTesting RadioInterfaceCapabilityController(final RadioConfig radioConfig, final CommandsInterface commandsInterface, final Looper looper)92 public RadioInterfaceCapabilityController(final RadioConfig radioConfig, 93 final CommandsInterface commandsInterface, final Looper looper) { 94 super(looper); 95 mRadioConfig = radioConfig; 96 mCommandsInterface = commandsInterface; 97 register(); 98 } 99 requestCapabilities()100 private void requestCapabilities() { 101 if (mRadioInterfaceCapabilities != null) return; 102 103 mRadioConfig.getHalDeviceCapabilities(obtainMessage( 104 EVENT_GET_HAL_DEVICE_CAPABILITIES_DONE)); 105 } 106 107 /** 108 * Gets the radio interface capabilities for the device 109 */ 110 @NonNull getCapabilities()111 public Set<String> getCapabilities() { 112 if (mRadioInterfaceCapabilities == null) { 113 // Only incur cost of synchronization block if mRadioInterfaceCapabilities isn't null 114 synchronized (mLockRadioInterfaceCapabilities) { 115 if (mRadioInterfaceCapabilities == null) { 116 requestCapabilities(); 117 try { 118 if (Looper.myLooper() != getLooper()) { 119 mLockRadioInterfaceCapabilities.wait(2000); 120 } 121 } catch (final InterruptedException ignored) { 122 } 123 124 if (mRadioInterfaceCapabilities == null) { 125 loge("getRadioInterfaceCapabilities: Radio Capabilities not " 126 + "loaded in time"); 127 return new ArraySet<>(); 128 } 129 } 130 } 131 } 132 return mRadioInterfaceCapabilities; 133 } 134 setupCapabilities(final @NonNull AsyncResult ar)135 private void setupCapabilities(final @NonNull AsyncResult ar) { 136 if (mRadioInterfaceCapabilities == null) { 137 synchronized (mLockRadioInterfaceCapabilities) { 138 if (mRadioInterfaceCapabilities == null) { 139 if (ar.exception != null) { 140 loge("setupRadioInterfaceCapabilities: " + ar.exception); 141 } 142 if (ar.result == null) { 143 loge("setupRadioInterfaceCapabilities: ar.result is null"); 144 return; 145 } 146 log("setupRadioInterfaceCapabilities: " 147 + "mRadioInterfaceCapabilities now setup"); 148 mRadioInterfaceCapabilities = 149 Collections.unmodifiableSet((Set<String>) ar.result); 150 if (mRadioInterfaceCapabilities != null) { 151 unregister(); 152 } 153 } 154 mLockRadioInterfaceCapabilities.notify(); 155 } 156 } 157 } 158 register()159 private void register() { 160 // There is no radio HAL, capabilities are irrelevant in this case. 161 if (mCommandsInterface == null) { 162 mRadioInterfaceCapabilities = Collections.unmodifiableSet(new ArraySet<>()); 163 return; 164 } 165 166 mCommandsInterface.registerForAvailable(this, Phone.EVENT_RADIO_AVAILABLE, null); 167 } 168 unregister()169 private void unregister() { 170 mCommandsInterface.unregisterForAvailable(this); 171 } 172 173 @Override handleMessage(final Message msg)174 public void handleMessage(final Message msg) { 175 switch (msg.what) { 176 case Phone.EVENT_RADIO_AVAILABLE: 177 case Phone.EVENT_RADIO_ON: 178 requestCapabilities(); 179 break; 180 case EVENT_GET_HAL_DEVICE_CAPABILITIES_DONE: 181 setupCapabilities((AsyncResult) msg.obj); 182 break; 183 } 184 } 185 186 /** 187 * Dump the fields of the instance 188 */ dump(FileDescriptor fd, PrintWriter pw, String[] args)189 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 190 pw.println("mRadioConfig=" + mRadioConfig); 191 } 192 log(final String s)193 private static void log(final String s) { 194 Rlog.d(LOG_TAG, s); 195 } 196 loge(final String s)197 private static void loge(final String s) { 198 Rlog.e(LOG_TAG, s); 199 } 200 } 201