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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 {
// ---------------------------------------------------------------------------
class SensorDevice : public Singleton<SensorDevice> {
friend class Singleton<SensorDevice>;
sensors_poll_device_1_t* mSensorDevice;
struct sensors_module_t* mSensorModule;
static const nsecs_t MINIMUM_EVENTS_PERIOD = 1000000; // 1000 Hz
mutable Mutex mLock; // protect mActivationCount[].batchParams
// fixed-size array after construction
// Struct to store all the parameters(samplingPeriod, maxBatchReportLatency and flags) from
// batch call. For continous mode clients, maxBatchReportLatency is set to zero.
struct BatchParams {
int flags;
nsecs_t batchDelay, batchTimeout;
BatchParams() : flags(0), batchDelay(0), batchTimeout(0) {}
BatchParams(int flag, nsecs_t delay, nsecs_t timeout): flags(flag), batchDelay(delay),
batchTimeout(timeout) { }
bool operator != (const BatchParams& other) {
return other.batchDelay != batchDelay || other.batchTimeout != batchTimeout ||
other.flags != flags;
}
};
// Store batch parameters in the KeyedVector and the optimal batch_rate and timeout in
// bestBatchParams. For every batch() call corresponding params are stored in batchParams
// vector. A continuous mode request is batch(... timeout=0 ..) followed by activate(). A batch
// mode request is batch(... timeout > 0 ...) followed by activate().
// Info is a per-sensor data structure which contains the batch parameters for each client that
// has registered for this sensor.
struct Info {
BatchParams bestBatchParams;
// Key is the unique identifier(ident) for each client, value is the batch parameters
// requested by the client.
KeyedVector<void*, BatchParams> batchParams;
Info() : bestBatchParams(-1, -1, -1) {}
// Sets batch parameters for this ident. Returns error if this ident is not already present
// in the KeyedVector above.
status_t setBatchParamsForIdent(void* ident, int flags, int64_t samplingPeriodNs,
int64_t maxBatchReportLatencyNs);
// Finds the optimal parameters for batching and stores them in bestBatchParams variable.
void selectBatchParams();
// Removes batchParams for an ident and re-computes bestBatchParams. Returns the index of
// the removed ident. If index >=0, ident is present and successfully removed.
ssize_t removeBatchParamsForIdent(void* ident);
};
DefaultKeyedVector<int, Info> mActivationCount;
SensorDevice();
public:
ssize_t getSensorList(sensor_t const** list);
status_t initCheck() const;
int getHalDeviceVersion() const;
ssize_t poll(sensors_event_t* buffer, size_t count);
status_t activate(void* ident, int handle, int enabled);
status_t batch(void* ident, int handle, int flags, int64_t samplingPeriodNs,
int64_t maxBatchReportLatencyNs);
// Call batch with timeout zero instead of calling setDelay() for newer devices.
status_t setDelay(void* ident, int handle, int64_t ns);
status_t flush(void* ident, int handle);
void autoDisable(void *ident, int handle);
void dump(String8& result);
};
// ---------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_SENSOR_DEVICE_H
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