| // 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. |
| |
| #ifndef DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_ |
| #define DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_ |
| |
| #include "base/scoped_observer.h" |
| |
| #include "device/base/device_monitor_linux.h" |
| #include "device/generic_sensor/generic_sensor_export.h" |
| #include "device/generic_sensor/public/interfaces/sensor.mojom.h" |
| |
| namespace device { |
| |
| struct SensorInfoLinux; |
| |
| // This SensorDeviceManager uses LinuxDeviceMonitor to enumerate devices |
| // and listen to "add/removed" events to notify |provider_| about |
| // added or removed iio devices. It has own cache to speed up an identification |
| // process of removed devices. |
| class DEVICE_GENERIC_SENSOR_EXPORT SensorDeviceManager |
| : public DeviceMonitorLinux::Observer { |
| public: |
| class Delegate { |
| public: |
| // Called when SensorDeviceManager has enumerated through all possible |
| // iio udev devices. |
| virtual void OnSensorNodesEnumerated() = 0; |
| |
| // Called after SensorDeviceManager has identified a udev device, which |
| // belongs to "iio" subsystem. |
| virtual void OnDeviceAdded(mojom::SensorType type, |
| std::unique_ptr<SensorInfoLinux> sensor) = 0; |
| |
| // Called after "removed" event is received from LinuxDeviceMonitor and |
| // sensor is identified as known. |
| virtual void OnDeviceRemoved(mojom::SensorType type, |
| const std::string& device_node) = 0; |
| |
| protected: |
| virtual ~Delegate() {} |
| }; |
| |
| SensorDeviceManager(); |
| ~SensorDeviceManager() override; |
| |
| // Starts this service. |
| virtual void Start(Delegate* delegate); |
| |
| protected: |
| using SensorDeviceMap = std::unordered_map<std::string, mojom::SensorType>; |
| |
| // Wrappers around udev system methods that can be implemented differently |
| // by tests. |
| virtual std::string GetUdevDeviceGetSubsystem(udev_device* dev); |
| virtual std::string GetUdevDeviceGetSyspath(udev_device* dev); |
| virtual std::string GetUdevDeviceGetSysattrValue( |
| udev_device* dev, |
| const std::string& attribute); |
| virtual std::string GetUdevDeviceGetDevnode(udev_device* dev); |
| |
| // DeviceMonitorLinux::Observer: |
| void OnDeviceAdded(udev_device* udev_device) override; |
| void OnDeviceRemoved(udev_device* device) override; |
| |
| // Represents a map of sensors that are already known to this manager after |
| // initial enumeration. |
| SensorDeviceMap sensors_by_node_; |
| |
| base::ThreadChecker thread_checker_; |
| ScopedObserver<DeviceMonitorLinux, DeviceMonitorLinux::Observer> observer_; |
| |
| Delegate* delegate_; |
| |
| // A task runner, which |delegate_| lives on. |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SensorDeviceManager); |
| }; |
| |
| } // namespace device |
| |
| #endif // DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_ |