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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 #include "chromeos/system/cpu_temperature_reader.h" | |
6 | |
7 #include "base/files/file_enumerator.h" | |
8 #include "base/files/file_path.h" | |
9 #include "base/files/file_util.h" | |
10 #include "base/location.h" | |
11 #include "base/strings/string_number_conversions.h" | |
12 #include "base/strings/string_util.h" | |
13 #include "base/task_scheduler/post_task.h" | |
14 #include "base/task_scheduler/task_traits.h" | |
15 | |
16 namespace chromeos { | |
17 namespace system { | |
18 | |
19 namespace { | |
20 | |
21 // The location we read our CPU temperature and channel label from. | |
22 const char kDefaultHwmonDir[] = "/sys/class/hwmon/"; | |
Daniel Erat
2017/04/20 21:23:52
nit: use constexpr char for all of these
Simon Que
2017/04/21 08:52:25
Done.
| |
23 const char kDeviceDir[] = "device"; | |
24 const char kHwmonDirectoryPattern[] = "hwmon*"; | |
25 const char kCPUTempFilePattern[] = "temp*_input"; | |
26 | |
27 using CPUTemperatureInfo = CPUTemperatureReader::CPUTemperatureInfo; | |
Daniel Erat
2017/04/20 21:23:52
move this up outside of the anon namespace (it fee
Simon Que
2017/04/21 08:52:26
Done.
| |
28 | |
29 bool ReadTemperatureFromPath(const base::FilePath& path, double* temp_celsius) { | |
Daniel Erat
2017/04/20 21:23:53
temp_celsius_out
Simon Que
2017/04/21 08:52:25
Done.
| |
30 std::string temperature_string; | |
31 uint32_t temperature = 0; | |
32 if (base::ReadFileToString(path, &temperature_string) && | |
33 base::StringToUint(temperature_string, &temperature)) { | |
34 *temp_celsius = static_cast<double>(temperature) / 1000; | |
Daniel Erat
2017/04/20 21:23:53
instead of static_cast, you can probably just divi
Simon Que
2017/04/21 08:52:26
Done.
| |
35 return true; | |
36 } | |
37 return false; | |
38 } | |
39 | |
40 std::string GetLabelFromPath(const base::FilePath& label_path) { | |
41 // Get the label describing this temperature. Use temp*_label | |
42 // if present, fall back on name file or blank. | |
43 std::string label; | |
44 if (base::PathExists(base::FilePath(label_path))) { | |
45 base::ReadFileToString(base::FilePath(label_path), &label); | |
46 return label; | |
47 } | |
48 | |
49 base::FilePath name_path = label_path.DirName().Append("name"); | |
50 if (base::PathExists(base::FilePath(name_path))) { | |
51 base::ReadFileToString(name_path, &label); | |
52 } | |
53 return label; | |
Daniel Erat
2017/04/20 21:23:53
returning an empty string feels a bit strange. wou
Simon Que
2017/04/21 08:52:25
Done.
| |
54 } | |
55 | |
56 std::vector<CPUTemperatureInfo> ReadCPUTemperatures( | |
57 const std::string& hwmon_dir) { | |
58 std::vector<CPUTemperatureInfo> result; | |
59 | |
60 // Get directories /sys/class/hwmon/hwmon* | |
Daniel Erat
2017/04/20 21:23:53
nit: add trailing period
Simon Que
2017/04/21 08:52:26
Done.
| |
61 base::FileEnumerator hwmon_enumerator(base::FilePath(hwmon_dir), false, | |
62 base::FileEnumerator::DIRECTORIES, | |
63 kHwmonDirectoryPattern); | |
64 for (base::FilePath hwmon_path = hwmon_enumerator.Next(); !hwmon_path.empty(); | |
65 hwmon_path = hwmon_enumerator.Next()) { | |
66 // Get temp*_input files in hwmon*/ and hwmon*/device/ | |
Daniel Erat
2017/04/20 21:23:52
nit: add trailing period
Simon Que
2017/04/21 08:52:25
Done.
| |
67 if (base::PathExists(hwmon_path.Append(kDeviceDir))) { | |
68 hwmon_path = hwmon_path.Append(kDeviceDir); | |
69 } | |
70 base::FileEnumerator enumerator( | |
71 hwmon_path, false, base::FileEnumerator::FILES, kCPUTempFilePattern); | |
72 for (base::FilePath temperature_path = enumerator.Next(); | |
73 !temperature_path.empty(); temperature_path = enumerator.Next()) { | |
74 // Get appropriate temp*_label file. | |
75 std::string label_path = temperature_path.MaybeAsASCII(); | |
76 if (label_path.empty()) { | |
77 LOG(WARNING) << "Unable to parse a path to temp*_input file as ASCII"; | |
78 continue; | |
79 } | |
80 CPUTemperatureInfo info; | |
81 if (!ReadTemperatureFromPath(temperature_path, &info.temp_celsius)) { | |
82 LOG(WARNING) << "Unable to read CPU temperature from " << label_path; | |
83 continue; | |
84 } | |
85 base::ReplaceSubstringsAfterOffset(&label_path, 0, "input", "label"); | |
86 info.label = GetLabelFromPath(base::FilePath(label_path)); | |
87 result.push_back(info); | |
88 } | |
89 } | |
90 return result; | |
91 } | |
92 | |
93 } // namespace | |
94 | |
95 CPUTemperatureReader::CPUTemperatureReader() : hwmon_dir_(kDefaultHwmonDir) {} | |
96 | |
97 void CPUTemperatureReader::GetCPUTemperatures( | |
98 const GetCPUTemperaturesCallback& callback) { | |
99 base::PostTaskWithTraitsAndReplyWithResult( | |
100 FROM_HERE, | |
101 base::TaskTraits().MayBlock().WithPriority( | |
102 base::TaskPriority::BACKGROUND), | |
103 base::Bind(&ReadCPUTemperatures, hwmon_dir_), callback); | |
104 } | |
105 | |
106 } // namespace system | |
107 } // namespace chromeos | |
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