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 #include "otautil/ThermalUtil.h" 18 19 #include <dirent.h> 20 #include <stdio.h> 21 22 #include <algorithm> 23 #include <string> 24 #include <vector> 25 26 #include <android-base/file.h> 27 #include <android-base/logging.h> 28 #include <android-base/parseint.h> 29 #include <android-base/strings.h> 30 31 static constexpr auto THERMAL_PREFIX = "/sys/class/thermal/"; 32 33 static int thermal_filter(const dirent* de) { 34 if (android::base::StartsWith(de->d_name, "thermal_zone")) { 35 return 1; 36 } 37 return 0; 38 } 39 40 static std::vector<std::string> InitThermalPaths() { 41 dirent** namelist; 42 int n = scandir(THERMAL_PREFIX, &namelist, thermal_filter, alphasort); 43 if (n == -1) { 44 PLOG(ERROR) << "Failed to scandir " << THERMAL_PREFIX; 45 return {}; 46 } 47 if (n == 0) { 48 LOG(ERROR) << "Failed to find CPU thermal info in " << THERMAL_PREFIX; 49 return {}; 50 } 51 52 std::vector<std::string> thermal_paths; 53 while (n--) { 54 thermal_paths.push_back(THERMAL_PREFIX + std::string(namelist[n]->d_name) + "/temp"); 55 free(namelist[n]); 56 } 57 free(namelist); 58 return thermal_paths; 59 } 60 61 int GetMaxValueFromThermalZone() { 62 static std::vector<std::string> thermal_paths = InitThermalPaths(); 63 int max_temperature = -1; 64 for (const auto& path : thermal_paths) { 65 std::string content; 66 if (!android::base::ReadFileToString(path, &content)) { 67 PLOG(WARNING) << "Failed to read " << path; 68 continue; 69 } 70 71 int temperature; 72 if (!android::base::ParseInt(android::base::Trim(content), &temperature)) { 73 LOG(WARNING) << "Failed to parse integer in " << content; 74 continue; 75 } 76 max_temperature = std::max(temperature, max_temperature); 77 } 78 LOG(INFO) << "current maximum temperature: " << max_temperature; 79 return max_temperature; 80 } 81
