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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "SensorServiceUtils.h"
#include <sensor/Sensor.h>
#include <stdint.h>
#include <sys/types.h>
#include <utils/KeyedVector.h>
#include <utils/Singleton.h>
#include <utils/String8.h>
#include <string>
#include <unordered_map>
#include <algorithm> //std::max std::min
#include "android/hardware/sensors/1.0/ISensors.h"
#include "RingBuffer.h"
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
using SensorServiceUtil::Dumpable;
using hardware::Return;
class SensorDevice : public Singleton<SensorDevice>, public Dumpable {
class HidlTransportErrorLog {
HidlTransportErrorLog() {
mTs = 0;
mCount = 0;
HidlTransportErrorLog(time_t ts, int count) {
mTs = ts;
mCount = count;
String8 toString() const {
String8 result;
struct tm *timeInfo = localtime(&mTs);
result.appendFormat("%02d:%02d:%02d :: %d", timeInfo->tm_hour, timeInfo->tm_min,
timeInfo->tm_sec, mCount);
return result;
time_t mTs; // timestamp of the error
int mCount; // number of transport errors observed
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);
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);
// Dumpable
virtual std::string dump() const;
friend class Singleton<SensorDevice>;
sp<android::hardware::sensors::V1_0::ISensors> mSensors;
Vector<sensor_t> mSensorList;
std::unordered_map<int32_t, sensor_t*> mConnectedDynamicSensors;
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;
// 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);
int numActiveClients();
DefaultKeyedVector<int, Info> mActivationCount;
// Keep track of any hidl transport failures
SensorServiceUtil::RingBuffer<HidlTransportErrorLog> mHidlTransportErrors;
int mTotalHidlTransportErrors;
// Use this vector to determine which client is activated or deactivated.
SortedVector<void *> mDisabledClients;
bool connectHidlService();
static void handleHidlDeath(const std::string &detail);
template<typename T>
static Return<T> checkReturn(Return<T> &&ret) {
if (!ret.isOk()) {
return std::move(ret);
bool isClientDisabled(void* ident);
bool isClientDisabledLocked(void* ident);
using Event = hardware::sensors::V1_0::Event;
using SensorInfo = hardware::sensors::V1_0::SensorInfo;
void convertToSensorEvent(const Event &src, sensors_event_t *dst);
void convertToSensorEvents(
const hardware::hidl_vec<Event> &src,
const hardware::hidl_vec<SensorInfo> &dynamicSensorsAdded,
sensors_event_t *dst);
bool mIsDirectReportSupported;
// ---------------------------------------------------------------------------
}; // namespace android