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- // Copyright 2017 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "chromeos/system/cpu_temperature_reader.h"
- #include "base/files/file_enumerator.h"
- #include "base/files/file_path.h"
- #include "base/files/file_util.h"
- #include "base/location.h"
- #include "base/logging.h"
- #include "base/strings/string_number_conversions.h"
- #include "base/strings/string_util.h"
- #include "base/task/task_traits.h"
- namespace chromeos {
- namespace system {
- using CPUTemperatureInfo = CPUTemperatureReader::CPUTemperatureInfo;
- namespace {
- // The location we read our CPU temperature and channel label from.
- constexpr char kDefaultHwmonDir[] = "/sys/class/hwmon/";
- constexpr char kDeviceDir[] = "device";
- constexpr char kHwmonDirectoryPattern[] = "hwmon*";
- constexpr char kCPUTempFilePattern[] = "temp*_input";
- // The contents of sysfs files might contain a newline at the end. Use this
- // function to read from a sysfs file and remove the newline.
- bool ReadFileContentsAndTrimWhitespace(const base::FilePath& path,
- std::string* contents_out) {
- if (!base::ReadFileToString(path, contents_out))
- return false;
- base::TrimWhitespaceASCII(*contents_out, base::TRIM_TRAILING, contents_out);
- return true;
- }
- // Reads the temperature as degrees Celsius from the file at |path|, which is
- // expected to contain the temperature in millidegrees Celsius. Converts the
- // value into degrees and then stores it in |*temp_celsius_out|. returns true if
- // the value was successfully read from file, parsed as an int, and converted.
- bool ReadTemperatureFromPath(const base::FilePath& path,
- double* temp_celsius_out) {
- std::string temperature_string;
- if (!ReadFileContentsAndTrimWhitespace(path, &temperature_string))
- return false;
- uint32_t temperature = 0;
- if (!base::StringToUint(temperature_string, &temperature))
- return false;
- *temp_celsius_out = temperature / 1000.0;
- return true;
- }
- // Gets the label describing this temperature. Use the file "temp*_label" if it
- // is present, or fall back on the file "name" or |label_path|.
- std::string GetLabelFromPath(const base::FilePath& label_path) {
- std::string label;
- if (base::PathExists(label_path) &&
- ReadFileContentsAndTrimWhitespace(base::FilePath(label_path), &label) &&
- !label.empty()) {
- return label;
- }
- base::FilePath name_path = label_path.DirName().Append("name");
- if (base::PathExists(name_path) &&
- ReadFileContentsAndTrimWhitespace(name_path, &label) && !label.empty()) {
- return label;
- }
- return label_path.value();
- }
- void ReadTemperaturesFromDirectory(const base::FilePath& hwmon_path,
- std::vector<CPUTemperatureInfo>* result) {
- base::FileEnumerator enumerator(
- hwmon_path, false, base::FileEnumerator::FILES, kCPUTempFilePattern);
- for (base::FilePath temperature_path = enumerator.Next();
- !temperature_path.empty(); temperature_path = enumerator.Next()) {
- CPUTemperatureInfo info;
- if (!ReadTemperatureFromPath(temperature_path, &info.temp_celsius)) {
- DLOG(WARNING) << "Unable to read CPU temperature from "
- << temperature_path.value();
- continue;
- }
- // Get appropriate temp*_label file.
- std::string label_path = temperature_path.value();
- base::ReplaceSubstringsAfterOffset(&label_path, 0, "input", "label");
- info.label = GetLabelFromPath(base::FilePath(label_path));
- result->push_back(info);
- }
- }
- } // namespace
- CPUTemperatureReader::CPUTemperatureInfo::CPUTemperatureInfo() = default;
- CPUTemperatureReader::CPUTemperatureInfo::~CPUTemperatureInfo() = default;
- CPUTemperatureReader::CPUTemperatureReader() : hwmon_dir_(kDefaultHwmonDir) {}
- CPUTemperatureReader::~CPUTemperatureReader() = default;
- std::vector<CPUTemperatureInfo> CPUTemperatureReader::GetCPUTemperatures() {
- std::vector<CPUTemperatureInfo> result;
- // Get directories /sys/class/hwmon/hwmon*.
- base::FileEnumerator hwmon_enumerator(hwmon_dir_, false,
- base::FileEnumerator::DIRECTORIES,
- kHwmonDirectoryPattern);
- for (base::FilePath hwmon_path = hwmon_enumerator.Next(); !hwmon_path.empty();
- hwmon_path = hwmon_enumerator.Next()) {
- // Get temp*_input files in hwmon*/ and hwmon*/device/. A survey of DUTs
- // suggests that temp values are contained in hwmon*/device on kernel 3.14
- // and earlier and directly in hwmon*/ in kernel 3.18 and later. When no
- // device subdirectory is present, the temp values are always contained
- // directly within the hwmon directory.
- ReadTemperaturesFromDirectory(hwmon_path, &result);
- if (base::PathExists(hwmon_path.Append(kDeviceDir))) {
- ReadTemperaturesFromDirectory(hwmon_path.Append(kDeviceDir), &result);
- }
- }
- return result;
- }
- } // namespace system
- } // namespace chromeos
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