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/*
* 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.
*/
#include "otautil/ThermalUtil.h"
#include <dirent.h>
#include <stdio.h>
#include <algorithm>
#include <string>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
static constexpr auto THERMAL_PREFIX = "/sys/class/thermal/";
static int thermal_filter(const dirent* de) {
if (android::base::StartsWith(de->d_name, "thermal_zone")) {
return 1;
}
return 0;
}
static std::vector<std::string> InitThermalPaths() {
dirent** namelist;
int n = scandir(THERMAL_PREFIX, &namelist, thermal_filter, alphasort);
if (n == -1) {
PLOG(ERROR) << "Failed to scandir " << THERMAL_PREFIX;
return {};
}
if (n == 0) {
LOG(ERROR) << "Failed to find CPU thermal info in " << THERMAL_PREFIX;
return {};
}
std::vector<std::string> thermal_paths;
while (n--) {
thermal_paths.push_back(THERMAL_PREFIX + std::string(namelist[n]->d_name) + "/temp");
free(namelist[n]);
}
free(namelist);
return thermal_paths;
}
int GetMaxValueFromThermalZone() {
static std::vector<std::string> thermal_paths = InitThermalPaths();
int max_temperature = -1;
for (const auto& path : thermal_paths) {
std::string content;
if (!android::base::ReadFileToString(path, &content)) {
PLOG(WARNING) << "Failed to read " << path;
continue;
}
int temperature;
if (!android::base::ParseInt(android::base::Trim(content), &temperature)) {
LOG(WARNING) << "Failed to parse integer in " << content;
continue;
}
max_temperature = std::max(temperature, max_temperature);
}
LOG(INFO) << "current maximum temperature: " << max_temperature;
return max_temperature;
}
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