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Side by Side Diff: device/generic_sensor/public/interfaces/sensor_provider.mojom

Issue 2144623003: [sensors] Introduce Generic Sensor API interfaces (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Comments from Tim and Ken Created 4 years, 4 months ago
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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 module device.mojom;
6
7 import "sensor.mojom";
8
9 struct SensorReadBuffer {
10 // The shared memory handle used to fetch the sensor reading.
11 handle<shared_buffer> memory;
12
13 // The offset at which shared buffer must be mapped.
14 uint64 offset;
15
16 // The ReportingMode supported by the sensor.
17 ReportingMode mode;
18
19 // Note: Each sensor's read buffer contains 4 tightly packed 64-bit floating
20 // point fields, its layout is: { double timestamp; double values[3] }.
21 // So it has a fixed size 4*8 = 32 bytes.
22 const uint64 kReadBufferSize = 32;
23 };
24
25 interface SensorProvider {
26 // Gets the sensor interface by the given type.
27 //
28 // |type| type of the sensor.
29 //
30 // |sensor_request| the Sensor interface instance to be initialized.
31 //
32 // |read_buffer| on success will contain the SensorReadBuffer describing the
33 // sensor reading buffer details,
34 // contains null on failure.
35 // |client_request| on success contains a request to be bound by the client,
36 // contains null on failure.
37 GetSensor(SensorType type, Sensor& sensor_request) => (
38 SensorReadBuffer? read_buffer,
39 SensorClient&? client_request);
40 };
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