1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ANDROID_SENSOR_INTERFACE_H
18 #define ANDROID_SENSOR_INTERFACE_H
19 
20 #include <gui/Sensor.h>
21 #include <utils/RefBase.h>
22 
23 // ---------------------------------------------------------------------------
24 
25 namespace android {
26 // ---------------------------------------------------------------------------
27 class SensorDevice;
28 class SensorFusion;
29 
30 class SensorInterface : public VirtualLightRefBase {
31 public:
~SensorInterface()32     virtual ~SensorInterface() {}
33 
34     virtual bool process(sensors_event_t* outEvent, const sensors_event_t& event) = 0;
35 
36     virtual status_t activate(void* ident, bool enabled) = 0;
37     virtual status_t setDelay(void* ident, int handle, int64_t ns) = 0;
38     virtual status_t batch(void* ident, int handle, int /*flags*/, int64_t samplingPeriodNs,
39                            int64_t maxBatchReportLatencyNs) = 0;
40 
41     virtual status_t flush(void* /*ident*/, int /*handle*/) = 0;
42 
43     virtual const Sensor& getSensor() const = 0;
44     virtual bool isVirtual() const = 0;
45     virtual void autoDisable(void* /*ident*/, int /*handle*/) = 0;
46 };
47 
48 class BaseSensor : public SensorInterface {
49 public:
50     BaseSensor(const sensor_t& sensor);
51     BaseSensor(const sensor_t& sensor, const uint8_t (&uuid)[16]);
52 
53     // Not all sensors need to support batching.
batch(void * ident,int handle,int,int64_t samplingPeriodNs,int64_t maxBatchReportLatencyNs)54     virtual status_t batch(void* ident, int handle, int, int64_t samplingPeriodNs,
55                            int64_t maxBatchReportLatencyNs) override {
56         if (maxBatchReportLatencyNs == 0) {
57             return setDelay(ident, handle, samplingPeriodNs);
58         }
59         return -EINVAL;
60     }
61 
flush(void *,int)62     virtual status_t flush(void* /*ident*/, int /*handle*/) override {
63         return -EINVAL;
64     }
65 
getSensor()66     virtual const Sensor& getSensor() const override { return mSensor; }
autoDisable(void *,int)67     virtual void autoDisable(void* /*ident*/, int /*handle*/) override { }
68 protected:
69     SensorDevice& mSensorDevice;
70     Sensor mSensor;
71 };
72 
73 // ---------------------------------------------------------------------------
74 
75 class HardwareSensor : public BaseSensor {
76 public:
77     HardwareSensor(const sensor_t& sensor);
78     HardwareSensor(const sensor_t& sensor, const uint8_t (&uuid)[16]);
79 
80     virtual ~HardwareSensor();
81 
82     virtual bool process(sensors_event_t* outEvent,
83             const sensors_event_t& event);
84 
85     virtual status_t activate(void* ident, bool enabled) override;
86     virtual status_t batch(void* ident, int handle, int flags, int64_t samplingPeriodNs,
87                            int64_t maxBatchReportLatencyNs) override;
88     virtual status_t setDelay(void* ident, int handle, int64_t ns) override;
89     virtual status_t flush(void* ident, int handle) override;
isVirtual()90     virtual bool isVirtual() const override { return false; }
91     virtual void autoDisable(void *ident, int handle) override;
92 };
93 
94 class VirtualSensor : public BaseSensor
95 {
96 public:
97     VirtualSensor();
isVirtual()98     virtual bool isVirtual() const override { return true; }
99 protected:
100     SensorFusion& mSensorFusion;
101 };
102 
103 
104 // ---------------------------------------------------------------------------
105 }; // namespace android
106 
107 #endif // ANDROID_SENSOR_INTERFACE_H
108