Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

device/generic_sensor/linux/sensor_data_linux.cc

Index: device/generic_sensor/linux/sensor_data_linux.cc
diff --git a/device/generic_sensor/linux/sensor_data_linux.cc b/device/generic_sensor/linux/sensor_data_linux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8e506a918a9051a93378b8260e1ed1959ecc35d3
--- /dev/null
+++ b/device/generic_sensor/linux/sensor_data_linux.cc
@@ -0,0 +1,212 @@
+// 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.
+
+#include "base/sys_info.h"
+#include "base/version.h"
+#include "device/generic_sensor/generic_sensor_consts.h"
+#include "device/generic_sensor/linux/sensor_data_linux.h"
+#include "device/generic_sensor/public/cpp/sensor_reading.h"
+
+namespace device {
+
+namespace {
+
+using mojom::SensorType;
+
+#if defined(OS_CHROMEOS)
+// ChromeOS kernel version, when axes were changed to XYZ. Before 3.18,
+// they were YXZ.
+const char kChangedAxisKernelVersion[] = "3.18.0";
+#endif
+
+void InitAmbientLightSensorData(SensorPathsLinux* data) {
+  std::vector<std::string> file_names{
+      "in_illuminance0_input", "in_illuminance_input", "in_illuminance0_raw",
+      "in_illuminance_raw", "in_intensity_both_raw"};
+  data->sensor_file_names.push_back(std::move(file_names));
+  data->sensor_frequency_file_name = "in_intensity_sampling_frequency";
+  data->sensor_scale_name = "in_intensity_scale";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        reading.values[0] = scaling_value * (reading.values[0] + offset);
+      });
+  data->default_configuration =
+      PlatformSensorConfiguration(kDefaultAmbientLightFrequencyHz);
+}
+
+// Depending on a kernel version, CrOS has a different axes plane.
+// Before 3.18 it was YXZ and after XYZ.
+// TODO(maksims): Track crbug.com/501184. 3.14 will have the same sensor stack
+// as 3.18 has, which will probably change the order of axes.
+void MaybeCheckKernelVersionAndAssignFileNames(
+    const std::vector<std::string>& file_names_x,
+    const std::vector<std::string>& file_names_y,
+    const std::vector<std::string>& file_names_z,
+    SensorPathsLinux* data) {
+#if defined(OS_CHROMEOS)
+  const base::Version checked_kernel_version(kChangedAxisKernelVersion);
+  DCHECK(checked_kernel_version.IsValid());
+  const base::Version current_version(base::SysInfo::OperatingSystemVersion());
+  if (current_version.IsValid() && current_version < checked_kernel_version) {
+    data->sensor_file_names.push_back(file_names_y);
+    data->sensor_file_names.push_back(file_names_x);
+  } else {
+    data->sensor_file_names.push_back(file_names_x);
+    data->sensor_file_names.push_back(file_names_y);
+  }
+  data->sensor_file_names.push_back(file_names_z);
+#else
+  data->sensor_file_names.push_back(file_names_x);
+  data->sensor_file_names.push_back(file_names_y);
+  data->sensor_file_names.push_back(file_names_z);
+#endif
+}
+
+// TODO(maksims): add support for lid accelerometer on chromeos.
+void InitAccelerometerSensorData(SensorPathsLinux* data) {
+  std::vector<std::string> file_names_x{"in_accel_x_base_raw",
+                                        "in_accel_x_raw"};
+  std::vector<std::string> file_names_y{"in_accel_y_base_raw",
+                                        "in_accel_y_raw"};
+  std::vector<std::string> file_names_z{"in_accel_z_base_raw",
+                                        "in_accel_z_raw"};
+
+#if defined(OS_CHROMEOS)
+  data->sensor_scale_name = "in_accel_base_scale";
+  data->sensor_frequency_file_name = "in_accel_base_sampling_frequency";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        double scaling = kMeanGravity / scaling_value;
+        reading.values[0] = scaling * (reading.values[0] + offset);
+        reading.values[1] = scaling * (reading.values[1] + offset);
+        reading.values[2] = scaling * (reading.values[2] + offset);
+      });
+#else
+  data->sensor_scale_name = "in_accel_scale";
+  data->sensor_offset_file_name = "in_accel_offset";
+  data->sensor_frequency_file_name = "in_accel_sampling_frequency";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        // Adapt Linux reading values to generic sensor api specs.
+        reading.values[0] = -scaling_value * (reading.values[0] + offset);
+        reading.values[1] = -scaling_value * (reading.values[1] + offset);
+        reading.values[2] = -scaling_value * (reading.values[2] + offset);
+      });
+#endif
+
+  MaybeCheckKernelVersionAndAssignFileNames(file_names_x, file_names_y,
+                                            file_names_z, data);
+  data->default_configuration =
+      PlatformSensorConfiguration(kDefaultAccelerometerFrequencyHz);
+}
+
+void InitGyroscopeSensorData(SensorPathsLinux* data) {
+  std::vector<std::string> file_names_x{"in_anglvel_x_base_raw",
+                                        "in_anglvel_x_raw"};
+  std::vector<std::string> file_names_y{"in_anglvel_y_base_raw",
+                                        "in_anglvel_y_raw"};
+  std::vector<std::string> file_names_z{"in_anglvel_z_base_raw",
+                                        "in_anglvel_z_raw"};
+#if defined(OS_CHROMEOS)
+  data->sensor_scale_name = "in_anglvel_base_scale";
+  data->sensor_frequency_file_name = "in_anglvel_base_frequency";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        double scaling = kMeanGravity * kRadiansInDegrees / scaling_value;
+        // Adapt CrOS reading values to generic sensor api specs.
+        reading.values[0] = -scaling * (reading.values[0] + offset);
+        reading.values[1] = -scaling * (reading.values[1] + offset);
+        reading.values[2] = -scaling * (reading.values[2] + offset);
+      });
+#else
+  data->sensor_scale_name = "in_anglvel_scale";
+  data->sensor_offset_file_name = "in_anglvel_offset";
+  data->sensor_frequency_file_name = "in_anglvel_sampling_frequency";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        reading.values[0] = scaling_value * (reading.values[0] + offset);
+        reading.values[1] = scaling_value * (reading.values[1] + offset);
+        reading.values[2] = scaling_value * (reading.values[2] + offset);
+      });
+#endif
+
+  MaybeCheckKernelVersionAndAssignFileNames(file_names_x, file_names_y,
+                                            file_names_z, data);
+  data->default_configuration =
+      PlatformSensorConfiguration(kDefaultGyroscopeFrequencyHz);
+}
+
+// TODO(maksims): Verify magnitometer works correctly on a chromebook when
+// I get one with that sensor onboard.
+void InitMagnitometerSensorData(SensorPathsLinux* data) {
+  std::vector<std::string> file_names_x{"in_magn_x_raw"};
+  std::vector<std::string> file_names_y{"in_magn_y_raw"};
+  std::vector<std::string> file_names_z{"in_magn_z_raw"};
+
+  data->sensor_scale_name = "in_magn_scale";
+  data->sensor_offset_file_name = "in_magn_offset";
+  data->sensor_frequency_file_name = "in_magn_sampling_frequency";
+  data->apply_scaling_func = base::Bind(
+      [](double scaling_value, double offset, SensorReading& reading) {
+        double scaling = scaling_value * kMicroteslaInGauss;
+        reading.values[0] = scaling * (reading.values[0] + offset);
+        reading.values[1] = scaling * (reading.values[1] + offset);
+        reading.values[2] = scaling * (reading.values[2] + offset);
+      });
+
+  MaybeCheckKernelVersionAndAssignFileNames(file_names_x, file_names_y,
+                                            file_names_z, data);
+  data->default_configuration =
+      PlatformSensorConfiguration(kDefaultMagnetometerFrequencyHz);
+}
+
+}  // namespace
+
+SensorPathsLinux::SensorPathsLinux() = default;
+SensorPathsLinux::~SensorPathsLinux() = default;
+SensorPathsLinux::SensorPathsLinux(const SensorPathsLinux& other) = default;
+
+bool InitSensorData(SensorType type, SensorPathsLinux* data) {
+  DCHECK(data);
+
+  data->type = type;
+  switch (type) {
+    case SensorType::AMBIENT_LIGHT:
+      InitAmbientLightSensorData(data);
+      break;
+    case SensorType::ACCELEROMETER:
+      InitAccelerometerSensorData(data);
+      break;
+    case SensorType::GYROSCOPE:
+      InitGyroscopeSensorData(data);
+      break;
+    case SensorType::MAGNETOMETER:
+      InitMagnitometerSensorData(data);
+      break;
+    default:
+      return false;
+  }
+
+  return true;
+}
+
+SensorInfoLinux::SensorInfoLinux(
+    const std::string& sensor_device_node,
+    double sensor_device_frequency,
+    double sensor_device_scaling_value,
+    double sensor_device_offset_value,
+    mojom::ReportingMode mode,
+    SensorPathsLinux::ReaderFunctor scaling_func,
+    std::vector<base::FilePath> device_reading_files)
+    : device_node(sensor_device_node),
+      device_frequency(sensor_device_frequency),
+      device_scaling_value(sensor_device_scaling_value),
+      device_offset_value(sensor_device_offset_value),
+      reporting_mode(mode),
+      apply_scaling_func(scaling_func),
+      device_reading_files(std::move(device_reading_files)) {}
+
+SensorInfoLinux::~SensorInfoLinux() = default;
+
+}  // namespace device