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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)) { |
| 97 task_runner_->PostTask( |
| 98 FROM_HERE, base::Bind(&PlatformSensorIio::NotifySensorError, this)); |
| 99 StopPoll(); |
| 100 return; |
| 101 } |
| 102 |
| 103 bool notifyNeeded = false; |
| 104 if ((GetReportingMode() == mojom::ReportingMode::ON_CHANGE)) { |
| 105 if (!HasValuesChanged(reading, old_values_)) { |
| 106 return; |
| 107 } |
| 108 notifyNeeded = true; |
| 109 } |
| 110 |
| 111 old_values_ = reading; |
| 112 reading.timestamp = (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF(); |
| 113 UpdateSensorReading(reading, notifyNeeded); |
| 114 } |
| 115 |
| 116 } // namespace device |
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