replicant-frameworks_native/services/sensorservice/SensorDevice.h
Mathias Agopian f001c92436 Add support for virtual sensors.
Rework sensorservice to allow "virtual sensors", that is
sensors that report a synthetized value based on real sensors.

the main change to sensorservice is around managing which real
sensor need to be activated and which rate to use.

The logic for all this has been moved into SensorDevice, which
essentially wraps the sensor HAL but adds two features to it:
- it keeps track of which sensors need to be activated
- it keeps track of what rate needs to be used

For this purpose an "identity" is associated with each real sensor
activation, so we can track them.

On start-up we check for gravity, linear-acceleration and
rotation-vector sensors, if they're not present in the HAL, we
synthetize them in sensor-service.

Change-Id: I841db2c1b37ef127ed571efa21732ecc5adf1800
2012-06-27 17:07:54 -07:00

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2.0 KiB
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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_SENSOR_DEVICE_H
#define ANDROID_SENSOR_DEVICE_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/KeyedVector.h>
#include <utils/Singleton.h>
#include <utils/String8.h>
#include <gui/Sensor.h>
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
static const nsecs_t DEFAULT_EVENTS_PERIOD = 200000000; // 5 Hz
class SensorDevice : public Singleton<SensorDevice> {
friend class Singleton<SensorDevice>;
struct sensors_poll_device_t* mSensorDevice;
struct sensors_module_t* mSensorModule;
Mutex mLock; // protect mActivationCount[].rates
// fixed-size array after construction
struct Info {
Info() : count(0) { }
int32_t count;
KeyedVector<void*, nsecs_t> rates;
};
DefaultKeyedVector<int, Info> mActivationCount;
SensorDevice();
public:
ssize_t getSensorList(sensor_t const** list);
status_t initCheck() const;
ssize_t poll(sensors_event_t* buffer, size_t count);
status_t activate(void* ident, int handle, int enabled);
status_t setDelay(void* ident, int handle, int64_t ns);
void dump(String8& result, char* buffer, size_t SIZE);
};
// ---------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_SENSOR_DEVICE_H