| /* |
| * Copyright (C) 2017 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.car.storagemonitoring; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.util.Log; |
| |
| import com.android.car.CarLog; |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.IOException; |
| |
| /** |
| * Loads wear information from the eMMC sysfs entry points. |
| * sysfs exposes eMMC lifetime data in /sys/bus/mmc/devices/mmc0:0001/{pre_eol_info|life_time} |
| * The first file contains the value of the PRE_EOL_INFO register as an hexadecimal string |
| * The second file contains the values of the LIFE_TIME_EST A and B registers as two hexadecimal |
| * strings separated by a space. |
| */ |
| public class EMmcWearInformationProvider implements WearInformationProvider { |
| private static File DEFAULT_LIFE_TIME_FILE = |
| new File("/sys/bus/mmc/devices/mmc0:0001/life_time"); |
| |
| private static File DEFAULT_PRE_EOL_FILE = |
| new File("/sys/bus/mmc/devices/mmc0:0001/pre_eol_info"); |
| |
| private File mLifetimeFile; |
| private File mPreEolFile; |
| |
| public EMmcWearInformationProvider() { |
| this(DEFAULT_LIFE_TIME_FILE, DEFAULT_PRE_EOL_FILE); |
| } |
| |
| @VisibleForTesting |
| EMmcWearInformationProvider(@NonNull File lifetimeFile, @NonNull File preEolFile) { |
| mLifetimeFile = lifetimeFile; |
| mPreEolFile = preEolFile; |
| } |
| |
| private String readLineFromFile(File f) { |
| if (!f.exists() || !f.isFile()) { |
| Log.i(CarLog.TAG_STORAGE, f + " does not exist or is not a file"); |
| return null; |
| } |
| |
| try { |
| BufferedReader reader = new BufferedReader(new FileReader(f)); |
| String data = reader.readLine(); |
| reader.close(); |
| return data; |
| } catch (IOException e) { |
| Log.w(CarLog.TAG_STORAGE, f + " cannot be read from", e); |
| return null; |
| } |
| } |
| |
| @Nullable |
| @Override |
| public WearInformation load() { |
| String lifetimeData = readLineFromFile(mLifetimeFile); |
| String eolData = readLineFromFile(mPreEolFile); |
| |
| if ((lifetimeData == null) || (eolData == null)) { |
| return null; |
| } |
| |
| String[] lifetimes = lifetimeData.split(" "); |
| if (lifetimes.length != 2) { |
| Log.w(CarLog.TAG_STORAGE, "lifetime data not in expected format: " + lifetimeData); |
| return null; |
| } |
| |
| int lifetimeA; |
| int lifetimeB; |
| int eol; |
| |
| try { |
| lifetimeA = Integer.decode(lifetimes[0]); |
| lifetimeB = Integer.decode(lifetimes[1]); |
| eol = Integer.decode("0x" + eolData); |
| } catch (NumberFormatException e) { |
| Log.w(CarLog.TAG_STORAGE, "lifetime data not in expected format: " + lifetimeData); |
| return null; |
| } |
| |
| return new WearInformation(convertLifetime(lifetimeA), |
| convertLifetime(lifetimeB), |
| adjustEol(eol)); |
| } |
| } |