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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_provider_linux.h" |
| 6 |
| 7 #include "base/memory/singleton.h" |
| 8 #include "base/message_loop/message_loop.h" |
| 9 #include "base/task_runner_util.h" |
| 10 #include "base/threading/thread.h" |
| 11 #include "device/generic_sensor/linux/sensor_data_linux.h" |
| 12 #include "device/generic_sensor/platform_sensor_linux.h" |
| 13 #include "device/generic_sensor/platform_sensor_reader_linux.h" |
| 14 |
| 15 namespace device { |
| 16 |
| 17 // static |
| 18 PlatformSensorProviderLinux* PlatformSensorProviderLinux::GetInstance() { |
| 19 return base::Singleton< |
| 20 PlatformSensorProviderLinux, |
| 21 base::LeakySingletonTraits<PlatformSensorProviderLinux>>::get(); |
| 22 } |
| 23 |
| 24 PlatformSensorProviderLinux::PlatformSensorProviderLinux() |
| 25 : sensor_nodes_enumerated_(false), |
| 26 sensor_nodes_enumeration_started_(false), |
| 27 sensor_device_manager_(nullptr) {} |
| 28 |
| 29 PlatformSensorProviderLinux::~PlatformSensorProviderLinux() { |
| 30 DCHECK(!sensor_device_manager_); |
| 31 } |
| 32 |
| 33 void PlatformSensorProviderLinux::CreateSensorInternal( |
| 34 mojom::SensorType type, |
| 35 mojo::ScopedSharedBufferMapping mapping, |
| 36 const CreateSensorCallback& callback) { |
| 37 if (!sensor_device_manager_) |
| 38 sensor_device_manager_.reset(new SensorDeviceManager()); |
| 39 |
| 40 if (!sensor_nodes_enumerated_) { |
| 41 if (!sensor_nodes_enumeration_started_) { |
| 42 sensor_nodes_enumeration_started_ = file_task_runner_->PostTask( |
| 43 FROM_HERE, |
| 44 base::Bind(&SensorDeviceManager::Start, |
| 45 base::Unretained(sensor_device_manager_.get()), this)); |
| 46 } |
| 47 return; |
| 48 } |
| 49 |
| 50 SensorInfoLinux* sensor_device = GetSensorDevice(type); |
| 51 if (!sensor_device) { |
| 52 // If there are no sensors, stop polling thread. |
| 53 if (!HasSensors()) |
| 54 AllSensorsRemoved(); |
| 55 callback.Run(nullptr); |
| 56 return; |
| 57 } |
| 58 SensorDeviceFound(type, std::move(mapping), callback, sensor_device); |
| 59 } |
| 60 |
| 61 void PlatformSensorProviderLinux::SensorDeviceFound( |
| 62 mojom::SensorType type, |
| 63 mojo::ScopedSharedBufferMapping mapping, |
| 64 const PlatformSensorProviderBase::CreateSensorCallback& callback, |
| 65 const SensorInfoLinux* sensor_device) { |
| 66 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 67 DCHECK(sensor_device); |
| 68 |
| 69 if (!StartPollingThread()) { |
| 70 callback.Run(nullptr); |
| 71 return; |
| 72 } |
| 73 |
| 74 scoped_refptr<PlatformSensorLinux> sensor = |
| 75 new PlatformSensorLinux(type, std::move(mapping), this, sensor_device, |
| 76 polling_thread_->task_runner()); |
| 77 callback.Run(sensor); |
| 78 } |
| 79 |
| 80 void PlatformSensorProviderLinux::SetFileTaskRunner( |
| 81 scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) { |
| 82 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 83 if (!file_task_runner_) |
| 84 file_task_runner_ = file_task_runner; |
| 85 } |
| 86 |
| 87 void PlatformSensorProviderLinux::AllSensorsRemoved() { |
| 88 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 89 DCHECK(file_task_runner_); |
| 90 Shutdown(); |
| 91 // When there are no sensors left, the polling thread must be stopped. |
| 92 // Stop() can only be called on a different thread that allows I/O. |
| 93 // Thus, browser's file thread is used for this purpose. |
| 94 file_task_runner_->PostTask( |
| 95 FROM_HERE, base::Bind(&PlatformSensorProviderLinux::StopPollingThread, |
| 96 base::Unretained(this))); |
| 97 } |
| 98 |
| 99 bool PlatformSensorProviderLinux::StartPollingThread() { |
| 100 if (!polling_thread_) |
| 101 polling_thread_.reset(new base::Thread("Sensor polling thread")); |
| 102 |
| 103 if (!polling_thread_->IsRunning()) { |
| 104 return polling_thread_->StartWithOptions( |
| 105 base::Thread::Options(base::MessageLoop::TYPE_IO, 0)); |
| 106 } |
| 107 return true; |
| 108 } |
| 109 |
| 110 void PlatformSensorProviderLinux::StopPollingThread() { |
| 111 DCHECK(file_task_runner_); |
| 112 DCHECK(file_task_runner_->BelongsToCurrentThread()); |
| 113 if (polling_thread_ && polling_thread_->IsRunning()) |
| 114 polling_thread_->Stop(); |
| 115 } |
| 116 |
| 117 void PlatformSensorProviderLinux::Shutdown() { |
| 118 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 119 const bool did_post_task = file_task_runner_->DeleteSoon( |
| 120 FROM_HERE, sensor_device_manager_.release()); |
| 121 DCHECK(did_post_task); |
| 122 sensor_nodes_enumerated_ = false; |
| 123 sensor_nodes_enumeration_started_ = false; |
| 124 sensor_devices_by_type_.clear(); |
| 125 } |
| 126 |
| 127 SensorInfoLinux* PlatformSensorProviderLinux::GetSensorDevice( |
| 128 mojom::SensorType type) { |
| 129 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 130 auto sensor = sensor_devices_by_type_.find(type); |
| 131 if (sensor == sensor_devices_by_type_.end()) |
| 132 return nullptr; |
| 133 return sensor->second.get(); |
| 134 } |
| 135 |
| 136 void PlatformSensorProviderLinux::GetAllSensorDevices() { |
| 137 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 138 // TODO(maksims): implement this method once we have discovery API. |
| 139 NOTIMPLEMENTED(); |
| 140 } |
| 141 |
| 142 void PlatformSensorProviderLinux::SetSensorDeviceManagerForTesting( |
| 143 std::unique_ptr<SensorDeviceManager> sensor_device_manager) { |
| 144 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 145 Shutdown(); |
| 146 sensor_device_manager_ = std::move(sensor_device_manager); |
| 147 } |
| 148 |
| 149 void PlatformSensorProviderLinux::SetFileTaskRunnerForTesting( |
| 150 scoped_refptr<base::SingleThreadTaskRunner> task_runner) { |
| 151 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 152 file_task_runner_ = std::move(task_runner); |
| 153 } |
| 154 |
| 155 void PlatformSensorProviderLinux::ProcessStoredRequests() { |
| 156 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 157 std::vector<mojom::SensorType> request_types = GetPendingRequestTypes(); |
| 158 if (request_types.empty()) |
| 159 return; |
| 160 |
| 161 for (auto const& type : request_types) { |
| 162 SensorInfoLinux* device = nullptr; |
| 163 auto device_entry = sensor_devices_by_type_.find(type); |
| 164 if (device_entry != sensor_devices_by_type_.end()) |
| 165 device = device_entry->second.get(); |
| 166 CreateSensorAndNotify(type, device); |
| 167 } |
| 168 } |
| 169 |
| 170 void PlatformSensorProviderLinux::CreateSensorAndNotify( |
| 171 mojom::SensorType type, |
| 172 SensorInfoLinux* sensor_device) { |
| 173 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 174 scoped_refptr<PlatformSensorLinux> sensor; |
| 175 mojo::ScopedSharedBufferMapping mapping = MapSharedBufferForType(type); |
| 176 if (sensor_device && mapping && StartPollingThread()) { |
| 177 sensor = |
| 178 new PlatformSensorLinux(type, std::move(mapping), this, sensor_device, |
| 179 polling_thread_->task_runner()); |
| 180 } |
| 181 NotifySensorCreated(type, sensor); |
| 182 } |
| 183 |
| 184 void PlatformSensorProviderLinux::OnSensorNodesEnumerated() { |
| 185 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 186 DCHECK(!sensor_nodes_enumerated_); |
| 187 sensor_nodes_enumerated_ = true; |
| 188 ProcessStoredRequests(); |
| 189 } |
| 190 |
| 191 void PlatformSensorProviderLinux::OnDeviceAdded( |
| 192 mojom::SensorType type, |
| 193 std::unique_ptr<SensorInfoLinux> sensor_device) { |
| 194 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 195 // At the moment, we support only one device per type. |
| 196 if (base::ContainsKey(sensor_devices_by_type_, type)) { |
| 197 DVLOG(1) << "Sensor ignored. Type " << type |
| 198 << ". Node: " << sensor_device->device_node; |
| 199 return; |
| 200 } |
| 201 sensor_devices_by_type_[type] = std::move(sensor_device); |
| 202 } |
| 203 |
| 204 void PlatformSensorProviderLinux::OnDeviceRemoved( |
| 205 mojom::SensorType type, |
| 206 const std::string& device_node) { |
| 207 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); |
| 208 auto it = sensor_devices_by_type_.find(type); |
| 209 if (it != sensor_devices_by_type_.end() && |
| 210 it->second->device_node == device_node) |
| 211 sensor_devices_by_type_.erase(it); |
| 212 } |
| 213 |
| 214 } // namespace device |
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