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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_manager.h" |
| 6 |
| 7 #include "base/strings/string_number_conversions.h" |
| 8 #include "base/threading/thread_restrictions.h" |
| 9 #include "base/threading/thread_task_runner_handle.h" |
| 10 #include "device/generic_sensor/linux/sensor_data_linux.h" |
| 11 |
| 12 namespace device { |
| 13 |
| 14 namespace { |
| 15 |
| 16 std::string StringOrEmptyIfNull(const char* value) { |
| 17 return value ? value : std::string(); |
| 18 } |
| 19 |
| 20 } // namespace |
| 21 |
| 22 SensorDeviceManager::SensorDeviceManager() |
| 23 : observer_(this), |
| 24 delegate_(nullptr), |
| 25 task_runner_(base::ThreadTaskRunnerHandle::Get()) { |
| 26 thread_checker_.DetachFromThread(); |
| 27 } |
| 28 |
| 29 SensorDeviceManager::~SensorDeviceManager() { |
| 30 DCHECK(thread_checker_.CalledOnValidThread()); |
| 31 } |
| 32 |
| 33 void SensorDeviceManager::Start(Delegate* delegate) { |
| 34 DCHECK(thread_checker_.CalledOnValidThread()); |
| 35 base::ThreadRestrictions::AssertIOAllowed(); |
| 36 DCHECK(!delegate_); |
| 37 |
| 38 delegate_ = delegate; |
| 39 |
| 40 DeviceMonitorLinux* monitor = DeviceMonitorLinux::GetInstance(); |
| 41 observer_.Add(monitor); |
| 42 monitor->Enumerate( |
| 43 base::Bind(&SensorDeviceManager::OnDeviceAdded, base::Unretained(this))); |
| 44 |
| 45 task_runner_->PostTask( |
| 46 FROM_HERE, |
| 47 base::Bind(&SensorDeviceManager::Delegate::OnSensorNodesEnumerated, |
| 48 base::Unretained(delegate_))); |
| 49 } |
| 50 |
| 51 std::string SensorDeviceManager::GetUdevDeviceGetSubsystem(udev_device* dev) { |
| 52 return StringOrEmptyIfNull(udev_device_get_subsystem(dev)); |
| 53 } |
| 54 |
| 55 std::string SensorDeviceManager::GetUdevDeviceGetSyspath(udev_device* dev) { |
| 56 return StringOrEmptyIfNull(udev_device_get_syspath(dev)); |
| 57 } |
| 58 |
| 59 std::string SensorDeviceManager::GetUdevDeviceGetSysattrValue( |
| 60 udev_device* dev, |
| 61 const std::string& attribute) { |
| 62 return StringOrEmptyIfNull( |
| 63 udev_device_get_sysattr_value(dev, attribute.c_str())); |
| 64 } |
| 65 |
| 66 std::string SensorDeviceManager::GetUdevDeviceGetDevnode(udev_device* dev) { |
| 67 return StringOrEmptyIfNull(udev_device_get_devnode(dev)); |
| 68 } |
| 69 |
| 70 void SensorDeviceManager::OnDeviceAdded(udev_device* dev) { |
| 71 const std::string subsystem = GetUdevDeviceGetSubsystem(dev); |
| 72 if (subsystem.empty() || subsystem.compare("iio") != 0) |
| 73 return; |
| 74 |
| 75 const std::string sysfs_path = GetUdevDeviceGetSyspath(dev); |
| 76 if (sysfs_path.empty()) |
| 77 return; |
| 78 |
| 79 const std::string device_node = GetUdevDeviceGetDevnode(dev); |
| 80 if (device_node.empty()) |
| 81 return; |
| 82 |
| 83 const uint32_t first = static_cast<uint32_t>(mojom::SensorType::FIRST); |
| 84 const uint32_t last = static_cast<uint32_t>(mojom::SensorType::LAST); |
| 85 for (uint32_t i = first; i < last; ++i) { |
| 86 SensorPathsLinux data; |
| 87 mojom::SensorType type = static_cast<mojom::SensorType>(i); |
| 88 if (!InitSensorData(type, &data)) |
| 89 continue; |
| 90 |
| 91 std::vector<base::FilePath> sensor_file_names; |
| 92 for (const std::vector<std::string>& names : data.sensor_file_names) { |
| 93 for (const auto& name : names) { |
| 94 const std::string value = |
| 95 GetUdevDeviceGetSysattrValue(dev, name.c_str()); |
| 96 if (value.empty()) |
| 97 continue; |
| 98 base::FilePath full_path = base::FilePath(sysfs_path).Append(name); |
| 99 sensor_file_names.push_back(full_path); |
| 100 break; |
| 101 } |
| 102 } |
| 103 |
| 104 if (sensor_file_names.empty()) |
| 105 continue; |
| 106 |
| 107 const std::string scaling_value = |
| 108 GetUdevDeviceGetSysattrValue(dev, data.sensor_scale_name.c_str()); |
| 109 // If scaling value is not found, treat it as 1. |
| 110 double sensor_scaling_value = 1; |
| 111 if (!scaling_value.empty()) |
| 112 base::StringToDouble(scaling_value, &sensor_scaling_value); |
| 113 |
| 114 const std::string offset_vallue = |
| 115 GetUdevDeviceGetSysattrValue(dev, data.sensor_offset_file_name.c_str()); |
| 116 // If offset value is not found, treat it as 0. |
| 117 double sensor_offset_value = 0; |
| 118 if (!offset_vallue.empty()) |
| 119 base::StringToDouble(offset_vallue, &sensor_offset_value); |
| 120 |
| 121 const std::string frequency_value = GetUdevDeviceGetSysattrValue( |
| 122 dev, data.sensor_frequency_file_name.c_str()); |
| 123 // If frequency is not found, use default one from SensorPathsLinux struct. |
| 124 double sensor_frequency_value = data.default_configuration.frequency(); |
| 125 // By default, |reporting_mode| is ON_CHANGE. But if platform provides |
| 126 // sampling frequency, the reporting mode is CONTINUOUS. |
| 127 mojom::ReportingMode reporting_mode = mojom::ReportingMode::ON_CHANGE; |
| 128 if (!frequency_value.empty()) { |
| 129 base::StringToDouble(frequency_value, &sensor_frequency_value); |
| 130 reporting_mode = mojom::ReportingMode::CONTINUOUS; |
| 131 } |
| 132 |
| 133 // Update own cache of known sensor devices. |
| 134 if (!base::ContainsKey(sensors_by_node_, device_node)) |
| 135 sensors_by_node_[device_node] = data.type; |
| 136 |
| 137 std::unique_ptr<SensorInfoLinux> device(new SensorInfoLinux( |
| 138 device_node, sensor_frequency_value, sensor_scaling_value, |
| 139 sensor_offset_value, reporting_mode, data.apply_scaling_func, |
| 140 std::move(sensor_file_names))); |
| 141 task_runner_->PostTask( |
| 142 FROM_HERE, base::Bind(&SensorDeviceManager::Delegate::OnDeviceAdded, |
| 143 base::Unretained(delegate_), data.type, |
| 144 base::Passed(&device))); |
| 145 |
| 146 // One |dev| can represent more than one sensor. |
| 147 // For example, there is an accelerometer and gyroscope represented by one |
| 148 // |dev| in Chrome OS, kernel < 3.18. Thus, iterate through all possible |
| 149 // types of sensors. |
| 150 } |
| 151 } |
| 152 |
| 153 void SensorDeviceManager::OnDeviceRemoved(udev_device* dev) { |
| 154 const std::string subsystem = GetUdevDeviceGetSubsystem(dev); |
| 155 if (subsystem.empty() || subsystem.compare("iio") != 0) |
| 156 return; |
| 157 |
| 158 const std::string device_node = GetUdevDeviceGetDevnode(dev); |
| 159 if (device_node.empty()) |
| 160 return; |
| 161 |
| 162 auto sensor = sensors_by_node_.find(device_node); |
| 163 if (sensor == sensors_by_node_.end()) |
| 164 return; |
| 165 mojom::SensorType type = sensor->second; |
| 166 sensors_by_node_.erase(sensor); |
| 167 |
| 168 task_runner_->PostTask( |
| 169 FROM_HERE, base::Bind(&SensorDeviceManager::Delegate::OnDeviceRemoved, |
| 170 base::Unretained(delegate_), type, device_node)); |
| 171 } |
| 172 |
| 173 } // namespace device |
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