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| 1 // Copyright 2016 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 "device/generic_sensor/linux/platform_sensor_utils_linux.h" |
| 6 |
| 7 #include "base/files/file_enumerator.h" |
| 8 #include "base/files/file_util.h" |
| 9 #include "base/strings/string_number_conversions.h" |
| 10 #include "base/strings/string_util.h" |
| 11 #include "base/threading/thread_restrictions.h" |
| 12 #include "device/generic_sensor/linux/sensor_data_linux.h" |
| 13 #include "device/generic_sensor/public/cpp/sensor_reading.h" |
| 14 |
| 15 namespace device { |
| 16 |
| 17 namespace { |
| 18 |
| 19 bool InitSensorPaths(const std::vector<std::string>& input_names, |
| 20 const char* base_path, |
| 21 std::vector<base::FilePath>* sensor_paths) { |
| 22 // Search the iio/devices directory for a subdirectory (eg "device0" or |
| 23 // "iio:device0") that contains the specified input_name file (eg |
| 24 // "in_illuminance_input" or "in_illuminance0_input"). |
| 25 base::FileEnumerator dir_enumerator(base::FilePath(base_path), false, |
| 26 base::FileEnumerator::DIRECTORIES); |
| 27 for (base::FilePath check_path = dir_enumerator.Next(); !check_path.empty(); |
| 28 check_path = dir_enumerator.Next()) { |
| 29 for (auto const& file_name : input_names) { |
| 30 base::FilePath full_path = check_path.Append(file_name); |
| 31 if (base::PathExists(full_path)) { |
| 32 sensor_paths->push_back(full_path); |
| 33 return true; |
| 34 } |
| 35 } |
| 36 } |
| 37 return false; |
| 38 } |
| 39 |
| 40 bool GetSensorFilePaths(const SensorDataLinux& data, |
| 41 std::vector<base::FilePath>* sensor_paths) { |
| 42 DCHECK(sensor_paths->empty()); |
| 43 // Depending on a sensor, there can be up to three sets of files that need |
| 44 // to be checked. If one of three files is not found, a sensor is |
| 45 // treated as a non-existing one. |
| 46 for (auto const& file_names : data.sensor_file_names) { |
| 47 // Supply InitSensorPaths() with a set of files. |
| 48 // Only one file from each set should be found. |
| 49 if (!InitSensorPaths(file_names, data.base_path_sensor_linux, sensor_paths)) |
| 50 return false; |
| 51 } |
| 52 return true; |
| 53 } |
| 54 |
| 55 } // namespace |
| 56 |
| 57 // static |
| 58 std::unique_ptr<SensorReader> SensorReader::Create( |
| 59 const SensorDataLinux& data) { |
| 60 base::ThreadRestrictions::AssertIOAllowed(); |
| 61 std::vector<base::FilePath> sensor_paths; |
| 62 if (!GetSensorFilePaths(data, &sensor_paths)) |
| 63 return nullptr; |
| 64 return base::WrapUnique(new SensorReader(std::move(sensor_paths))); |
| 65 } |
| 66 |
| 67 SensorReader::SensorReader(std::vector<base::FilePath> sensor_paths) |
| 68 : sensor_paths_(std::move(sensor_paths)) { |
| 69 DCHECK(!sensor_paths_.empty()); |
| 70 } |
| 71 |
| 72 SensorReader::~SensorReader() = default; |
| 73 |
| 74 bool SensorReader::ReadSensorReading(SensorReading* reading) { |
| 75 base::ThreadRestrictions::AssertIOAllowed(); |
| 76 SensorReading readings; |
| 77 DCHECK_LE(sensor_paths_.size(), arraysize(readings.values)); |
| 78 int i = 0; |
| 79 for (const auto& path : sensor_paths_) { |
| 80 std::string new_read_value; |
| 81 if (!base::ReadFileToString(path, &new_read_value)) |
| 82 return false; |
| 83 |
| 84 double new_value = 0; |
| 85 base::TrimWhitespaceASCII(new_read_value, base::TRIM_ALL, &new_read_value); |
| 86 if (!base::StringToDouble(new_read_value, &new_value)) |
| 87 return false; |
| 88 readings.values[i++] = new_value; |
| 89 } |
| 90 *reading = readings; |
| 91 return true; |
| 92 } |
| 93 |
| 94 } // namespace device |
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