| // Copyright 2016 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 "device/generic_sensor/linux/sensor_device_manager.h" |
| |
| #include "base/strings/string_number_conversions.h" |
| #include "base/threading/thread_restrictions.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| #include "device/generic_sensor/linux/sensor_data_linux.h" |
| |
| namespace device { |
| |
| namespace { |
| |
| std::string StringOrEmptyIfNull(const char* value) { |
| return value ? value : std::string(); |
| } |
| |
| } // namespace |
| |
| SensorDeviceManager::SensorDeviceManager() |
| : observer_(this), |
| delegate_(nullptr), |
| task_runner_(base::ThreadTaskRunnerHandle::Get()) { |
| thread_checker_.DetachFromThread(); |
| } |
| |
| SensorDeviceManager::~SensorDeviceManager() { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| } |
| |
| void SensorDeviceManager::Start(Delegate* delegate) { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| base::ThreadRestrictions::AssertIOAllowed(); |
| DCHECK(!delegate_); |
| |
| delegate_ = delegate; |
| |
| DeviceMonitorLinux* monitor = DeviceMonitorLinux::GetInstance(); |
| observer_.Add(monitor); |
| monitor->Enumerate( |
| base::Bind(&SensorDeviceManager::OnDeviceAdded, base::Unretained(this))); |
| |
| task_runner_->PostTask( |
| FROM_HERE, |
| base::Bind(&SensorDeviceManager::Delegate::OnSensorNodesEnumerated, |
| base::Unretained(delegate_))); |
| } |
| |
| std::string SensorDeviceManager::GetUdevDeviceGetSubsystem(udev_device* dev) { |
| return StringOrEmptyIfNull(udev_device_get_subsystem(dev)); |
| } |
| |
| std::string SensorDeviceManager::GetUdevDeviceGetSyspath(udev_device* dev) { |
| return StringOrEmptyIfNull(udev_device_get_syspath(dev)); |
| } |
| |
| std::string SensorDeviceManager::GetUdevDeviceGetSysattrValue( |
| udev_device* dev, |
| const std::string& attribute) { |
| return StringOrEmptyIfNull( |
| udev_device_get_sysattr_value(dev, attribute.c_str())); |
| } |
| |
| std::string SensorDeviceManager::GetUdevDeviceGetDevnode(udev_device* dev) { |
| return StringOrEmptyIfNull(udev_device_get_devnode(dev)); |
| } |
| |
| void SensorDeviceManager::OnDeviceAdded(udev_device* dev) { |
| const std::string subsystem = GetUdevDeviceGetSubsystem(dev); |
| if (subsystem.empty() || subsystem.compare("iio") != 0) |
| return; |
| |
| const std::string sysfs_path = GetUdevDeviceGetSyspath(dev); |
| if (sysfs_path.empty()) |
| return; |
| |
| const std::string device_node = GetUdevDeviceGetDevnode(dev); |
| if (device_node.empty()) |
| return; |
| |
| const uint32_t first = static_cast<uint32_t>(mojom::SensorType::FIRST); |
| const uint32_t last = static_cast<uint32_t>(mojom::SensorType::LAST); |
| for (uint32_t i = first; i < last; ++i) { |
| SensorPathsLinux data; |
| mojom::SensorType type = static_cast<mojom::SensorType>(i); |
| if (!InitSensorData(type, &data)) |
| continue; |
| |
| std::vector<base::FilePath> sensor_file_names; |
| for (const std::vector<std::string>& names : data.sensor_file_names) { |
| for (const auto& name : names) { |
| const std::string value = |
| GetUdevDeviceGetSysattrValue(dev, name.c_str()); |
| if (value.empty()) |
| continue; |
| base::FilePath full_path = base::FilePath(sysfs_path).Append(name); |
| sensor_file_names.push_back(full_path); |
| break; |
| } |
| } |
| |
| if (sensor_file_names.empty()) |
| continue; |
| |
| const std::string scaling_value = |
| GetUdevDeviceGetSysattrValue(dev, data.sensor_scale_name.c_str()); |
| // If scaling value is not found, treat it as 1. |
| double sensor_scaling_value = 1; |
| if (!scaling_value.empty()) |
| base::StringToDouble(scaling_value, &sensor_scaling_value); |
| |
| const std::string offset_vallue = |
| GetUdevDeviceGetSysattrValue(dev, data.sensor_offset_file_name.c_str()); |
| // If offset value is not found, treat it as 0. |
| double sensor_offset_value = 0; |
| if (!offset_vallue.empty()) |
| base::StringToDouble(offset_vallue, &sensor_offset_value); |
| |
| const std::string frequency_value = GetUdevDeviceGetSysattrValue( |
| dev, data.sensor_frequency_file_name.c_str()); |
| // If frequency is not found, use default one from SensorPathsLinux struct. |
| double sensor_frequency_value = data.default_configuration.frequency(); |
| // By default, |reporting_mode| is ON_CHANGE. But if platform provides |
| // sampling frequency, the reporting mode is CONTINUOUS. |
| mojom::ReportingMode reporting_mode = mojom::ReportingMode::ON_CHANGE; |
| if (!frequency_value.empty()) { |
| base::StringToDouble(frequency_value, &sensor_frequency_value); |
| reporting_mode = mojom::ReportingMode::CONTINUOUS; |
| } |
| |
| // Update own cache of known sensor devices. |
| if (!base::ContainsKey(sensors_by_node_, device_node)) |
| sensors_by_node_[device_node] = data.type; |
| |
| std::unique_ptr<SensorInfoLinux> device(new SensorInfoLinux( |
| device_node, sensor_frequency_value, sensor_scaling_value, |
| sensor_offset_value, reporting_mode, data.apply_scaling_func, |
| std::move(sensor_file_names))); |
| task_runner_->PostTask( |
| FROM_HERE, base::Bind(&SensorDeviceManager::Delegate::OnDeviceAdded, |
| base::Unretained(delegate_), data.type, |
| base::Passed(&device))); |
| |
| // One |dev| can represent more than one sensor. |
| // For example, there is an accelerometer and gyroscope represented by one |
| // |dev| in Chrome OS, kernel < 3.18. Thus, iterate through all possible |
| // types of sensors. |
| } |
| } |
| |
| void SensorDeviceManager::OnDeviceRemoved(udev_device* dev) { |
| const std::string subsystem = GetUdevDeviceGetSubsystem(dev); |
| if (subsystem.empty() || subsystem.compare("iio") != 0) |
| return; |
| |
| const std::string device_node = GetUdevDeviceGetDevnode(dev); |
| if (device_node.empty()) |
| return; |
| |
| auto sensor = sensors_by_node_.find(device_node); |
| if (sensor == sensors_by_node_.end()) |
| return; |
| mojom::SensorType type = sensor->second; |
| sensors_by_node_.erase(sensor); |
| |
| task_runner_->PostTask( |
| FROM_HERE, base::Bind(&SensorDeviceManager::Delegate::OnDeviceRemoved, |
| base::Unretained(delegate_), type, device_node)); |
| } |
| |
| } // namespace device |