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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROMEOS_SYSTEM_CPU_TEMPERATURE_READER_H_ |
| 6 #define CHROMEOS_SYSTEM_CPU_TEMPERATURE_READER_H_ |
| 7 |
| 8 #include <string> |
| 9 #include <utility> |
| 10 #include <vector> |
| 11 |
| 12 #include "base/files/file_path.h" |
| 13 #include "base/macros.h" |
| 14 |
| 15 namespace chromeos { |
| 16 namespace system { |
| 17 |
| 18 // Used to read CPU temperature info from sysfs hwmon. |
| 19 class CPUTemperatureReader { |
| 20 public: |
| 21 // Contains info from a CPU temperature sensor. |
| 22 struct CPUTemperatureInfo { |
| 23 CPUTemperatureInfo(); |
| 24 ~CPUTemperatureInfo(); |
| 25 |
| 26 bool operator<(const CPUTemperatureInfo& other) const { |
| 27 return std::make_pair(label, temp_celsius) < |
| 28 std::make_pair(other.label, other.temp_celsius); |
| 29 } |
| 30 |
| 31 // The temperature read by a CPU temperature sensor in degrees Celsius. |
| 32 double temp_celsius; |
| 33 |
| 34 // The name of the CPU temperature zone monitored by this sensor. Used to |
| 35 // identify the source of each temperature reading. Taken from sysfs "name" |
| 36 // or "label" field, if it exists. |
| 37 std::string label; |
| 38 }; |
| 39 |
| 40 CPUTemperatureReader(); |
| 41 ~CPUTemperatureReader(); |
| 42 |
| 43 void set_hwmon_dir_for_test(const base::FilePath& dir) { hwmon_dir_ = dir; } |
| 44 |
| 45 // Reads temperature from each thermal sensor of the CPU. Returns a vector |
| 46 // containing a reading from each sensor. This is a blocking function that |
| 47 // should be run on a thread that allows blocking operations. |
| 48 std::vector<CPUTemperatureInfo> GetCPUTemperatures(); |
| 49 |
| 50 private: |
| 51 // Sysfs hwmon directory path. |
| 52 base::FilePath hwmon_dir_; |
| 53 |
| 54 DISALLOW_COPY_AND_ASSIGN(CPUTemperatureReader); |
| 55 }; |
| 56 |
| 57 } // namespace system |
| 58 } // namespace chromeos |
| 59 |
| 60 #endif // CHROMEOS_SYSTEM_CPU_TEMPERATURE_READER_H_ |
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