Index: chromeos/system/cpu_temperature_reader.cc |
diff --git a/chromeos/system/cpu_temperature_reader.cc b/chromeos/system/cpu_temperature_reader.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8a3e5c09cbf3aa0010ac85239bff3d41faab543a |
--- /dev/null |
+++ b/chromeos/system/cpu_temperature_reader.cc |
@@ -0,0 +1,117 @@ |
+// 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/strings/string_number_conversions.h" |
+#include "base/strings/string_util.h" |
+#include "base/task_scheduler/post_task.h" |
+#include "base/task_scheduler/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(); |
+} |
+ |
+} // namespace |
+ |
+CPUTemperatureReader::CPUTemperatureInfo::CPUTemperatureInfo() {} |
+ |
+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/. |
+ if (base::PathExists(hwmon_path.Append(kDeviceDir))) { |
+ hwmon_path = hwmon_path.Append(kDeviceDir); |
+ } |
+ 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)) { |
+ LOG(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); |
+ } |
+ } |
+ return result; |
+} |
+ |
+} // namespace system |
+} // namespace chromeos |