| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.internal.telephony; |
| |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.os.PersistableBundle; |
| import android.os.UserHandle; |
| import android.telephony.CarrierConfigManager; |
| import android.telephony.ServiceState; |
| import android.telephony.Rlog; |
| import android.util.SparseArray; |
| import android.util.SparseIntArray; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * This class loads configuration from CarrierConfig and uses it to determine |
| * what RATs are within a ratcheting family. For example all the HSPA/HSDPA/HSUPA RATs. |
| * Then, until reset the class will only ratchet upwards within the family (order |
| * determined by the CarrierConfig data). The ServiceStateTracker will reset this |
| * on cell-change. |
| */ |
| public class RatRatcheter { |
| private final static String LOG_TAG = "RilRatcheter"; |
| |
| /** |
| * This is a map of RAT types -> RAT families for rapid lookup. |
| * The RAT families are defined by RAT type -> RAT Rank SparseIntArrays, so |
| * we can compare the priorities of two RAT types by comparing the values |
| * stored in the SparseIntArrays, higher values are higher priority. |
| */ |
| private final SparseArray<SparseIntArray> mRatFamilyMap = new SparseArray<>(); |
| |
| private final Phone mPhone; |
| |
| /** Constructor */ |
| public RatRatcheter(Phone phone) { |
| mPhone = phone; |
| |
| IntentFilter intentFilter = new IntentFilter(); |
| intentFilter.addAction(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED); |
| phone.getContext().registerReceiverAsUser(mConfigChangedReceiver, UserHandle.ALL, |
| intentFilter, null, null); |
| resetRatFamilyMap(); |
| } |
| |
| public int ratchetRat(int oldRat, int newRat) { |
| synchronized (mRatFamilyMap) { |
| final SparseIntArray oldFamily = mRatFamilyMap.get(oldRat); |
| if (oldFamily == null) return newRat; |
| |
| final SparseIntArray newFamily = mRatFamilyMap.get(newRat); |
| if (newFamily != oldFamily) return newRat; |
| |
| // now go with the higher of the two |
| final int oldRatRank = newFamily.get(oldRat, -1); |
| final int newRatRank = newFamily.get(newRat, -1); |
| return (oldRatRank > newRatRank ? oldRat : newRat); |
| } |
| } |
| |
| public void ratchetRat(ServiceState oldSS, ServiceState newSS) { |
| int newVoiceRat = ratchetRat(oldSS.getRilVoiceRadioTechnology(), |
| newSS.getRilVoiceRadioTechnology()); |
| int newDataRat = ratchetRat(oldSS.getRilDataRadioTechnology(), |
| newSS.getRilDataRadioTechnology()); |
| boolean newUsingCA = oldSS.isUsingCarrierAggregation() || |
| newSS.isUsingCarrierAggregation(); |
| |
| newSS.setRilVoiceRadioTechnology(newVoiceRat); |
| newSS.setRilDataRadioTechnology(newDataRat); |
| newSS.setIsUsingCarrierAggregation(newUsingCA); |
| } |
| |
| private BroadcastReceiver mConfigChangedReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| final String action = intent.getAction(); |
| if (CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED.equals(action)) { |
| resetRatFamilyMap(); |
| } |
| } |
| }; |
| |
| private void resetRatFamilyMap() { |
| synchronized(mRatFamilyMap) { |
| mRatFamilyMap.clear(); |
| |
| final CarrierConfigManager configManager = (CarrierConfigManager) |
| mPhone.getContext().getSystemService(Context.CARRIER_CONFIG_SERVICE); |
| if (configManager == null) return; |
| PersistableBundle b = configManager.getConfig(); |
| if (b == null) return; |
| |
| // Reads an array of strings, eg: |
| // ["GPRS, EDGE", "EVDO, EVDO_A, EVDO_B", "HSPA, HSDPA, HSUPA, HSPAP"] |
| // Each string defines a family and the order of rats within the string express |
| // the priority of the RAT within the family (ie, we'd move up to later-listed RATs, but |
| // not down). |
| String[] ratFamilies = b.getStringArray(CarrierConfigManager.KEY_RATCHET_RAT_FAMILIES); |
| if (ratFamilies == null) return; |
| for (String ratFamily : ratFamilies) { |
| String[] rats = ratFamily.split(","); |
| if (rats.length < 2) continue; |
| SparseIntArray currentFamily = new SparseIntArray(rats.length); |
| int pos = 0; |
| for (String ratString : rats) { |
| int ratInt; |
| try { |
| ratInt = Integer.parseInt(ratString.trim()); |
| } catch (NumberFormatException e) { |
| Rlog.e(LOG_TAG, "NumberFormatException on " + ratString); |
| break; |
| } |
| if (mRatFamilyMap.get(ratInt) != null) { |
| Rlog.e(LOG_TAG, "RAT listed twice: " + ratString); |
| break; |
| } |
| currentFamily.put(ratInt, pos++); |
| mRatFamilyMap.put(ratInt, currentFamily); |
| } |
| } |
| } |
| } |
| } |