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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 #ifndef DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_LINUX_H_ | |
6 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_LINUX_H_ | |
7 | |
8 #include "device/generic_sensor/platform_sensor.h" | |
9 | |
10 namespace base { | |
11 class RepeatingTimer; | |
12 class SingleThreadTaskRunner; | |
13 class Thread; | |
14 } | |
15 | |
16 namespace device { | |
17 | |
18 class SensorReader; | |
19 struct SensorDataLinux; | |
20 | |
21 class PlatformSensorLinux : public PlatformSensor { | |
22 public: | |
23 PlatformSensorLinux( | |
24 mojom::SensorType type, | |
25 mojo::ScopedSharedBufferMapping mapping, | |
26 PlatformSensorProvider* provider, | |
27 const SensorDataLinux& data, | |
28 std::unique_ptr<SensorReader> sensor_reader, | |
29 scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner); | |
30 | |
31 // Thread safe. | |
32 mojom::ReportingMode GetReportingMode() override; | |
33 | |
34 protected: | |
35 ~PlatformSensorLinux() override; | |
36 bool StartSensor(const PlatformSensorConfiguration& configuration) override; | |
37 void StopSensor() override; | |
38 bool CheckSensorConfiguration( | |
39 const PlatformSensorConfiguration& configuration) override; | |
40 PlatformSensorConfiguration GetDefaultConfiguration() override; | |
41 | |
42 private: | |
43 void BeginPoll(const PlatformSensorConfiguration& configuration); | |
44 void StopPoll(); | |
45 | |
46 // Triggers |sensor_reader_| to read new sensor data. | |
47 // If new data is read, UpdateSensorReading() is called. | |
48 void PollForReadingData(); | |
49 | |
50 // Owned timer to be deleted on a polling thread. | |
51 base::RepeatingTimer* timer_; | |
52 | |
53 const PlatformSensorConfiguration default_configuration_; | |
54 const mojom::ReportingMode reporting_mode_; | |
55 | |
56 // A sensor reader that reads values from sensor files | |
57 // and stores them to a SensorReading structure. | |
58 std::unique_ptr<SensorReader> sensor_reader_; | |
59 | |
60 // A task runner that is used to poll sensor data. | |
61 scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner_; | |
62 | |
63 // Stores previously read values that are used to | |
64 // determine whether the recent values are changed | |
65 // and IPC can be notified that updates are available. | |
66 SensorReading old_values_; | |
67 | |
68 base::WeakPtrFactory<PlatformSensorLinux> weak_factory_; | |
69 | |
70 DISALLOW_COPY_AND_ASSIGN(PlatformSensorLinux); | |
71 }; | |
72 | |
73 } // namespace device | |
74 | |
75 #endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_LINUX_H_ | |
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