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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 "HidlSensorHalWrapper.h"
#include "ISensorHalWrapper.h"
#include "ISensorsWrapper.h"
#include "SensorDeviceUtils.h"
#include "SensorService.h"
#include "SensorServiceUtils.h"
#include <sensor/Sensor.h>
#include <sensor/SensorEventQueue.h>
#include <stdint.h>
#include <sys/types.h>
#include <utils/KeyedVector.h>
#include <utils/Singleton.h>
#include <utils/String8.h>
#include <utils/Timers.h>
#include <algorithm> //std::max std::min
#include <string>
#include <unordered_map>
#include <vector>
#include "RingBuffer.h"
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
class SensorDevice : public Singleton<SensorDevice>,
public SensorServiceUtil::Dumpable,
public ISensorHalWrapper::SensorDeviceCallback {
public:
~SensorDevice();
void prepareForReconnect();
void reconnect();
ssize_t getSensorList(sensor_t const** list);
void handleDynamicSensorConnection(int handle, bool connected);
status_t initCheck() const;
int getHalDeviceVersion() const;
ssize_t poll(sensors_event_t* buffer, size_t count);
void writeWakeLockHandled(uint32_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);
status_t setMode(uint32_t mode);
bool isDirectReportSupported() const;
int32_t registerDirectChannel(const sensors_direct_mem_t* memory);
void unregisterDirectChannel(int32_t channelHandle);
int32_t configureDirectChannel(int32_t sensorHandle, int32_t channelHandle,
const struct sensors_direct_cfg_t* config);
void disableAllSensors();
void enableAllSensors();
void autoDisable(void* ident, int handle);
status_t injectSensorData(const sensors_event_t* event);
void notifyConnectionDestroyed(void* ident);
// SensorDeviceCallback
virtual void onDynamicSensorsConnected(
const std::vector<sensor_t>& dynamicSensorsAdded) override;
virtual void onDynamicSensorsDisconnected(
const std::vector<int32_t>& dynamicSensorHandlesRemoved) override;
void setUidStateForConnection(void* ident, SensorService::UidState state);
bool isReconnecting() const { return mHalWrapper->mReconnecting; }
bool isSensorActive(int handle) const;
// To update the BatchParams of a SensorEventConnection when the mic toggle changes its state
// while the Sensors Off toggle is on.
void onMicSensorAccessChanged(void* ident, int handle, nsecs_t samplingPeriodNs);
// Dumpable
virtual std::string dump() const override;
virtual void dump(util::ProtoOutputStream* proto) const override;
private:
friend class Singleton<SensorDevice>;
std::unique_ptr<ISensorHalWrapper> mHalWrapper;
std::vector<sensor_t> mSensorList;
std::unordered_map<int32_t, sensor_t> mConnectedDynamicSensors;
// A bug in the Sensors HIDL spec which marks onDynamicSensorsConnected as oneway causes dynamic
// meta events and onDynamicSensorsConnected to be received out of order. This mutex + CV are
// used to block meta event processing until onDynamicSensorsConnected is received to simplify
// HAL implementations.
std::mutex mDynamicSensorsMutex;
std::condition_variable mDynamicSensorsCv;
static constexpr std::chrono::seconds MAX_DYN_SENSOR_WAIT{5};
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 {
nsecs_t mTSample, mTBatch;
BatchParams() : mTSample(INT64_MAX), mTBatch(INT64_MAX) {}
BatchParams(nsecs_t tSample, nsecs_t tBatch) : mTSample(tSample), mTBatch(tBatch) {}
bool operator!=(const BatchParams& other) {
return !(mTSample == other.mTSample && mTBatch == other.mTBatch);
}
// Merge another parameter with this one. The updated mTSample will be the min of the two.
// The update mTBatch will be the min of original mTBatch and the apparent batch period
// of the other. the apparent batch is the maximum of mTBatch and mTSample,
void merge(const BatchParams& other) {
mTSample = std::min(mTSample, other.mTSample);
mTBatch = std::min(mTBatch, std::max(other.mTBatch, other.mTSample));
}
};
// 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;
// Flag to track if the sensor is active
bool isActive = false;
// 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);
bool hasBatchParamsForIdent(void* ident) const {
return batchParams.indexOfKey(ident) >= 0;
}
/**
* @return The number of active clients of this sensor.
*/
int numActiveClients() const;
};
DefaultKeyedVector<int, Info> mActivationCount;
int mTotalHidlTransportErrors;
/**
* Enums describing the reason why a client was disabled.
*/
enum DisabledReason : uint8_t {
// UID becomes idle (e.g. app goes to background).
DISABLED_REASON_UID_IDLE = 0,
// Sensors are restricted for all clients.
DISABLED_REASON_SERVICE_RESTRICTED,
DISABLED_REASON_MAX,
};
static_assert(DisabledReason::DISABLED_REASON_MAX < sizeof(uint8_t) * CHAR_BIT);
// Use this map to determine which client is activated or deactivated.
std::unordered_map<void*, uint8_t> mDisabledClients;
void addDisabledReasonForIdentLocked(void* ident, DisabledReason reason);
void removeDisabledReasonForIdentLocked(void* ident, DisabledReason reason);
SensorDevice();
bool connectHalService();
void initializeSensorList();
void reactivateSensors(const DefaultKeyedVector<int, Info>& previousActivations);
static bool sensorHandlesChanged(const std::vector<sensor_t>& oldSensorList,
const std::vector<sensor_t>& newSensorList);
static bool sensorIsEquivalent(const sensor_t& prevSensor, const sensor_t& newSensor);
status_t activateLocked(void* ident, int handle, int enabled);
status_t batchLocked(void* ident, int handle, int flags, int64_t samplingPeriodNs,
int64_t maxBatchReportLatencyNs);
status_t updateBatchParamsLocked(int handle, Info& info);
status_t doActivateHardwareLocked(int handle, bool enable);
bool isClientDisabled(void* ident) const;
bool isClientDisabledLocked(void* ident) const;
std::vector<void*> getDisabledClientsLocked() const;
bool clientHasNoAccessLocked(void* ident) const;
float getResolutionForSensor(int sensorHandle);
bool mIsDirectReportSupported;
};
// ---------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_SENSOR_DEVICE_H
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