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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/platform_sensor_iio.h" | |
6 | |
7 namespace device { | |
8 | |
9 namespace { | |
10 | |
11 // Checks if at least one value has been changed. | |
12 bool HasValuesChanged(const SensorReading& lhs, const SensorReading& rhs) { | |
13 return lhs.values[0] != rhs.values[0] || lhs.values[1] != rhs.values[1] || | |
14 lhs.values[2] != rhs.values[2]; | |
15 } | |
16 | |
17 } // namespace | |
18 | |
19 PlatformSensorIio::PlatformSensorIio( | |
20 mojom::SensorType type, | |
21 mojo::ScopedSharedBufferMapping mapping, | |
22 PlatformSensorProvider* provider, | |
23 const SensorDataIio& data, | |
24 std::unique_ptr<base::Thread> polling_thread, | |
25 std::unique_ptr<SensorReader> sensor_reader) | |
26 : PlatformSensor(type, std::move(mapping), provider), | |
27 timer_(new base::RepeatingTimer()), | |
28 default_configuration_(data.default_configuration), | |
29 reporting_mode_(data.reporting_mode), | |
30 sensor_reader_(std::move(sensor_reader)), | |
31 polling_thread_(std::move(polling_thread)), | |
32 polling_thread_task_runner_(polling_thread_->task_runner()), | |
33 weak_factory_(this) {} | |
34 | |
35 PlatformSensorIio::~PlatformSensorIio() { | |
36 polling_thread_task_runner_->DeleteSoon(FROM_HERE, timer_); | |
37 } | |
38 | |
39 mojom::ReportingMode PlatformSensorIio::GetReportingMode() { | |
40 return reporting_mode_; | |
41 } | |
42 | |
43 bool PlatformSensorIio::StartSensor( | |
44 const PlatformSensorConfiguration& configuration) { | |
45 DCHECK(task_runner_->BelongsToCurrentThread()); | |
46 if (!polling_thread_->IsRunning() && | |
47 !polling_thread_->StartWithOptions( | |
48 base::Thread::Options(base::MessageLoop::TYPE_IO, 0))) { | |
49 return false; | |
50 } | |
51 | |
52 return polling_thread_task_runner_->PostTask( | |
53 FROM_HERE, base::Bind(&PlatformSensorIio::BeginPoll, | |
54 weak_factory_.GetWeakPtr(), configuration)); | |
55 } | |
56 | |
57 void PlatformSensorIio::StopSensor() { | |
58 DCHECK(task_runner_->BelongsToCurrentThread()); | |
59 if (polling_thread_->IsRunning()) { | |
60 polling_thread_task_runner_->PostTask( | |
61 FROM_HERE, base::Bind(&PlatformSensorIio::StopPoll, this)); | |
62 } | |
63 } | |
64 | |
65 bool PlatformSensorIio::CheckSensorConfiguration( | |
66 const PlatformSensorConfiguration& configuration) { | |
67 DCHECK(task_runner_->BelongsToCurrentThread()); | |
68 return configuration.frequency() > 0 && | |
69 configuration.frequency() <= | |
70 mojom::SensorConfiguration::kMaxAllowedFrequency; | |
71 } | |
72 | |
73 PlatformSensorConfiguration PlatformSensorIio::GetDefaultConfiguration() { | |
74 DCHECK(task_runner_->BelongsToCurrentThread()); | |
75 return default_configuration_; | |
76 } | |
77 | |
78 void PlatformSensorIio::BeginPoll( | |
79 const PlatformSensorConfiguration& configuration) { | |
80 DCHECK(polling_thread_task_runner_->BelongsToCurrentThread()); | |
81 timer_->Start(FROM_HERE, base::TimeDelta::FromMicroseconds( | |
82 base::Time::kMicrosecondsPerSecond / | |
83 configuration.frequency()), | |
84 this, &PlatformSensorIio::PollForReadingData); | |
85 } | |
86 | |
87 void PlatformSensorIio::StopPoll() { | |
88 DCHECK(polling_thread_task_runner_->BelongsToCurrentThread()); | |
89 timer_->Stop(); | |
90 } | |
91 | |
92 void PlatformSensorIio::PollForReadingData() { | |
93 DCHECK(polling_thread_task_runner_->BelongsToCurrentThread()); | |
94 | |
95 SensorReading reading; | |
96 if (!sensor_reader_->ReadSensorReading(&reading)) { | |
shalamov
2016/10/19 10:03:22
Should notify PlatformSensor about error. check Pl
maksims (do not use this acc)
2016/10/19 13:25:57
Done.
| |
97 StopPoll(); | |
98 return; | |
99 } | |
100 | |
101 bool notifyNeeded = false; | |
102 if ((GetReportingMode() == mojom::ReportingMode::ON_CHANGE)) { | |
103 if (!HasValuesChanged(reading, old_values_)) { | |
104 return; | |
105 } | |
106 notifyNeeded = true; | |
107 } | |
108 | |
109 old_values_ = reading; | |
110 reading.timestamp = (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF(); | |
111 UpdateSensorReading(reading, notifyNeeded); | |
112 } | |
113 | |
114 } // namespace device | |
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