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99 lines
3.8 KiB
Plaintext
99 lines
3.8 KiB
Plaintext
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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module device.mojom;
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// Types of supported sensors
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// When adding new sensor type, update the documentation of sensor data values
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// in SensorReading struct at sensor_reading.h file.
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enum SensorType {
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FIRST = 1,
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AMBIENT_LIGHT = FIRST,
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PROXIMITY,
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ACCELEROMETER,
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LINEAR_ACCELERATION,
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GYROSCOPE,
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MAGNETOMETER,
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PRESSURE,
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// Legacy sensor to support the W3C DeviceOrientation Event Specification.
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ABSOLUTE_ORIENTATION_EULER_ANGLES,
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// Recommended for new code.
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ABSOLUTE_ORIENTATION_QUATERNION,
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// Legacy sensor to support the W3C DeviceOrientation Event Specification.
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RELATIVE_ORIENTATION_EULER_ANGLES,
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// Recommended for new code.
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RELATIVE_ORIENTATION_QUATERNION,
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LAST = RELATIVE_ORIENTATION_QUATERNION // Note: LAST is also equal to the types count.
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};
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// Reporting mode supported by the Sensor.
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// ON_CHANGE - client will be notified through OnSensorReadingChanged() signal
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// whenever sensor reading is changed.
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// CONTINUOUS - sensor will continuously update its reading with frequency
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// specified in SensorConfiguration.frequency.
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// OnSensorReadingChanged() signal is not sent to the client for
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// sensors with CONTINUOUS reporting mode.
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enum ReportingMode {
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ON_CHANGE,
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CONTINUOUS
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};
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struct SensorConfiguration {
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// Requested frequency in Hz.
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double frequency;
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// TODO(shalamov): Add map<string, union> for sensor specific configuration.
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};
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// Interface for controlling the Sensor.
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interface Sensor {
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// Requests sensor to provide its default configuration.
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GetDefaultConfiguration() => (SensorConfiguration configuration);
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// Requests sensor to start reading sensor data with specified
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// SensorConfiguration.
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// Sensor holds the list of added configurations and it always polls
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// the platform (and updates the shared buffer) at the maxiumum frequency
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// among the obtained from the stored configurations, so that all clients
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// can have sensor data in time.
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// Returns 'true' if |configuration| was successfully added.
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// Returns 'false' if |configuration| could not be added (is invalid
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// or not supported).
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AddConfiguration(SensorConfiguration configuration) => (bool success);
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// Requests sensor to stop reading sensor data for specified
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// SensorConfiguration.
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// This call excludes |configuration| from the Sensor's list making it
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// reconsider the the shared buffer udpate frequency. If there are no
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// configurations left in the Sensor's configuration list it stops polling
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// sensor data from the platform and update the shared buffer.
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// If |configuration| is not present in the Sensor's list the call is
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// ignored.
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RemoveConfiguration(SensorConfiguration configuration);
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// Temporary suppresses sensor reading changes notification and deactivates
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// all the previously added configurations for current instance.
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Suspend();
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// Resumes previously suspended sensor reading changes notification and
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// activates all the previously added configurations for current instance.
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Resume();
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// Disables or enables reading change notification for sensors with ON_CHANGE
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// reporting mode, keeping all the previously added configurations active.
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// Reading change notification is enabled by default.
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ConfigureReadingChangeNotifications(bool enabled);
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};
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// Interface that client of the Sensor interface must implement to observe
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// sensor reading changes and error conditions.
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interface SensorClient {
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// Signals SensorClient when there is an error.
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RaiseError();
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// Signals SensorClient when reading has been changed (only for sensors with
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// ReportingMode::ON_CHANGE).
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SensorReadingChanged();
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};
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