353 lines
16 KiB
C++
353 lines
16 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SENSOR_SERVICE_H
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#define ANDROID_SENSOR_SERVICE_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Vector.h>
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#include <utils/SortedVector.h>
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#include <utils/KeyedVector.h>
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#include <utils/threads.h>
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#include <utils/AndroidThreads.h>
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#include <utils/RefBase.h>
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#include <utils/Looper.h>
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#include <utils/String8.h>
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#include <binder/BinderService.h>
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#include <gui/Sensor.h>
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#include <gui/BitTube.h>
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#include <gui/ISensorServer.h>
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#include <gui/ISensorEventConnection.h>
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#include "SensorInterface.h"
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#if __clang__
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// Clang warns about SensorEventConnection::dump hiding BBinder::dump
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// The cause isn't fixable without changing the API, so let's tell clang
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// this is indeed intentional.
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#pragma clang diagnostic ignored "-Woverloaded-virtual"
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#endif
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// ---------------------------------------------------------------------------
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#define DEBUG_CONNECTIONS false
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// Max size is 100 KB which is enough to accept a batch of about 1000 events.
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#define MAX_SOCKET_BUFFER_SIZE_BATCHED 100 * 1024
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// For older HALs which don't support batching, use a smaller socket buffer size.
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#define SOCKET_BUFFER_SIZE_NON_BATCHED 4 * 1024
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struct sensors_poll_device_t;
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struct sensors_module_t;
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namespace android {
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// ---------------------------------------------------------------------------
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class SensorService :
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public BinderService<SensorService>,
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public BnSensorServer,
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protected Thread
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{
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friend class BinderService<SensorService>;
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enum Mode {
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// The regular operating mode where any application can register/unregister/call flush on
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// sensors.
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NORMAL = 0,
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// This mode is only used for testing purposes. Not all HALs support this mode. In this
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// mode, the HAL ignores the sensor data provided by physical sensors and accepts the data
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// that is injected from the SensorService as if it were the real sensor data. This mode
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// is primarily used for testing various algorithms like vendor provided SensorFusion,
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// Step Counter and Step Detector etc. Typically in this mode, there will be a client
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// (a SensorEventConnection) which will be injecting sensor data into the HAL. Normal apps
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// can unregister and register for any sensor that supports injection. Registering to sensors
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// that do not support injection will give an error.
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// TODO(aakella) : Allow exactly one client to inject sensor data at a time.
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DATA_INJECTION = 1,
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// This mode is used only for testing sensors. Each sensor can be tested in isolation with
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// the required sampling_rate and maxReportLatency parameters without having to think about
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// the data rates requested by other applications. End user devices are always expected to be
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// in NORMAL mode. When this mode is first activated, all active sensors from all connections
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// are disabled. Calling flush() will return an error. In this mode, only the requests from
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// selected apps whose package names are whitelisted are allowed (typically CTS apps). Only
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// these apps can register/unregister/call flush() on sensors. If SensorService switches to
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// NORMAL mode again, all sensors that were previously registered to are activated with the
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// corresponding paramaters if the application hasn't unregistered for sensors in the mean
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// time.
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// NOTE: Non whitelisted app whose sensors were previously deactivated may still receive
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// events if a whitelisted app requests data from the same sensor.
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RESTRICTED = 2
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// State Transitions supported.
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// RESTRICTED <--- NORMAL ---> DATA_INJECTION
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// ---> <---
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};
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static const char* WAKE_LOCK_NAME;
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static char const* getServiceName() ANDROID_API { return "sensorservice"; }
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SensorService() ANDROID_API;
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virtual ~SensorService();
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virtual void onFirstRef();
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// Thread interface
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virtual bool threadLoop();
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// ISensorServer interface
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virtual Vector<Sensor> getSensorList();
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virtual sp<ISensorEventConnection> createSensorEventConnection(const String8& packageName,
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int requestedMode);
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virtual status_t enableDataInjection(int enable);
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virtual status_t dump(int fd, const Vector<String16>& args);
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class SensorEventConnection : public BnSensorEventConnection, public LooperCallback {
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friend class SensorService;
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virtual ~SensorEventConnection();
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virtual void onFirstRef();
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virtual sp<BitTube> getSensorChannel() const;
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virtual status_t enableDisable(int handle, bool enabled, nsecs_t samplingPeriodNs,
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nsecs_t maxBatchReportLatencyNs, int reservedFlags);
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virtual status_t setEventRate(int handle, nsecs_t samplingPeriodNs);
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virtual status_t flush();
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// Count the number of flush complete events which are about to be dropped in the buffer.
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// Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be
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// sent separately before the next batch of events.
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void countFlushCompleteEventsLocked(sensors_event_t const* scratch, int numEventsDropped);
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// Check if there are any wake up events in the buffer. If yes, return the index of the
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// first wake_up sensor event in the buffer else return -1. This wake_up sensor event will
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// have the flag WAKE_UP_SENSOR_EVENT_NEEDS_ACK set. Exactly one event per packet will have
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// the wake_up flag set. SOCK_SEQPACKET ensures that either the entire packet is read or
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// dropped.
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int findWakeUpSensorEventLocked(sensors_event_t const* scratch, int count);
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// Send pending flush_complete events. There may have been flush_complete_events that are
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// dropped which need to be sent separately before other events. On older HALs (1_0) this
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// method emulates the behavior of flush().
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void sendPendingFlushEventsLocked();
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// Writes events from mEventCache to the socket.
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void writeToSocketFromCache();
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// Compute the approximate cache size from the FIFO sizes of various sensors registered for
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// this connection. Wake up and non-wake up sensors have separate FIFOs but FIFO may be
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// shared amongst wake-up sensors and non-wake up sensors.
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int computeMaxCacheSizeLocked() const;
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// When more sensors register, the maximum cache size desired may change. Compute max cache
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// size, reallocate memory and copy over events from the older cache.
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void reAllocateCacheLocked(sensors_event_t const* scratch, int count);
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// LooperCallback method. If there is data to read on this fd, it is an ack from the
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// app that it has read events from a wake up sensor, decrement mWakeLockRefCount.
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// If this fd is available for writing send the data from the cache.
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virtual int handleEvent(int fd, int events, void* data);
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// Increment mPendingFlushEventsToSend for the given sensor handle.
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void incrementPendingFlushCount(int32_t handle);
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// Add or remove the file descriptor associated with the BitTube to the looper. If mDead is
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// set to true or there are no more sensors for this connection, the file descriptor is
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// removed if it has been previously added to the Looper. Depending on the state of the
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// connection FD may be added to the Looper. The flags to set are determined by the internal
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// state of the connection. FDs are added to the looper when wake-up sensors are registered
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// (to poll for acknowledgements) and when write fails on the socket when there are too many
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// error and the other end hangs up or when this client unregisters for this connection.
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void updateLooperRegistration(const sp<Looper>& looper);
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void updateLooperRegistrationLocked(const sp<Looper>& looper);
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sp<SensorService> const mService;
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sp<BitTube> mChannel;
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uid_t mUid;
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mutable Mutex mConnectionLock;
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// Number of events from wake up sensors which are still pending and haven't been delivered
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// to the corresponding application. It is incremented by one unit for each write to the
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// socket.
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uint32_t mWakeLockRefCount;
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// If this flag is set to true, it means that the file descriptor associated with the
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// BitTube has been added to the Looper in SensorService. This flag is typically set when
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// this connection has wake-up sensors associated with it or when write has failed on this
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// connection and we're storing some events in the cache.
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bool mHasLooperCallbacks;
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// If there are any errors associated with the Looper this flag is set to true and
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// mWakeLockRefCount is reset to zero. needsWakeLock method will always return false, if
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// this flag is set.
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bool mDead;
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bool mDataInjectionMode;
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struct FlushInfo {
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// The number of flush complete events dropped for this sensor is stored here.
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// They are sent separately before the next batch of events.
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int mPendingFlushEventsToSend;
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// Every activate is preceded by a flush. Only after the first flush complete is
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// received, the events for the sensor are sent on that *connection*.
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bool mFirstFlushPending;
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FlushInfo() : mPendingFlushEventsToSend(0), mFirstFlushPending(false) {}
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};
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// protected by SensorService::mLock. Key for this vector is the sensor handle.
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KeyedVector<int, FlushInfo> mSensorInfo;
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sensors_event_t *mEventCache;
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int mCacheSize, mMaxCacheSize;
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String8 mPackageName;
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#if DEBUG_CONNECTIONS
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int mEventsReceived, mEventsSent, mEventsSentFromCache;
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int mTotalAcksNeeded, mTotalAcksReceived;
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#endif
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public:
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SensorEventConnection(const sp<SensorService>& service, uid_t uid, String8 packageName,
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bool isDataInjectionMode);
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status_t sendEvents(sensors_event_t const* buffer, size_t count,
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sensors_event_t* scratch,
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SensorEventConnection const * const * mapFlushEventsToConnections = NULL);
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bool hasSensor(int32_t handle) const;
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bool hasAnySensor() const;
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bool hasOneShotSensors() const;
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bool addSensor(int32_t handle);
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bool removeSensor(int32_t handle);
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void setFirstFlushPending(int32_t handle, bool value);
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void dump(String8& result);
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bool needsWakeLock();
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void resetWakeLockRefCount();
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String8 getPackageName() const;
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uid_t getUid() const { return mUid; }
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};
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class SensorRecord {
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SortedVector< wp<SensorEventConnection> > mConnections;
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// A queue of all flush() calls made on this sensor. Flush complete events will be
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// sent in this order.
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Vector< wp<SensorEventConnection> > mPendingFlushConnections;
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public:
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SensorRecord(const sp<SensorEventConnection>& connection);
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bool addConnection(const sp<SensorEventConnection>& connection);
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bool removeConnection(const wp<SensorEventConnection>& connection);
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size_t getNumConnections() const { return mConnections.size(); }
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void addPendingFlushConnection(const sp<SensorEventConnection>& connection);
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void removeFirstPendingFlushConnection();
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SensorEventConnection * getFirstPendingFlushConnection();
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void clearAllPendingFlushConnections();
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};
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class SensorEventAckReceiver : public Thread {
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sp<SensorService> const mService;
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public:
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virtual bool threadLoop();
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SensorEventAckReceiver(const sp<SensorService>& service): mService(service) {}
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};
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String8 getSensorName(int handle) const;
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bool isVirtualSensor(int handle) const;
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Sensor getSensorFromHandle(int handle) const;
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bool isWakeUpSensor(int type) const;
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void recordLastValueLocked(sensors_event_t const* buffer, size_t count);
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static void sortEventBuffer(sensors_event_t* buffer, size_t count);
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Sensor registerSensor(SensorInterface* sensor);
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Sensor registerVirtualSensor(SensorInterface* sensor);
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status_t cleanupWithoutDisable(
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const sp<SensorEventConnection>& connection, int handle);
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status_t cleanupWithoutDisableLocked(
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const sp<SensorEventConnection>& connection, int handle);
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void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection,
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sensors_event_t const* buffer, const int count);
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static bool canAccessSensor(const Sensor& sensor);
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static bool verifyCanAccessSensor(const Sensor& sensor, const char* operation);
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static bool hasDataInjectionPermissions();
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// SensorService acquires a partial wakelock for delivering events from wake up sensors. This
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// method checks whether all the events from these wake up sensors have been delivered to the
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// corresponding applications, if yes the wakelock is released.
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void checkWakeLockState();
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void checkWakeLockStateLocked();
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bool isWakeLockAcquired();
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bool isWakeUpSensorEvent(const sensors_event_t& event) const;
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SensorRecord * getSensorRecord(int handle);
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sp<Looper> getLooper() const;
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// Reset mWakeLockRefCounts for all SensorEventConnections to zero. This may happen if
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// SensorService did not receive any acknowledgements from apps which have registered for
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// wake_up sensors.
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void resetAllWakeLockRefCounts();
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// Acquire or release wake_lock. If wake_lock is acquired, set the timeout in the looper to
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// 5 seconds and wake the looper.
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void setWakeLockAcquiredLocked(bool acquire);
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// Send events from the event cache for this particular connection.
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void sendEventsFromCache(const sp<SensorEventConnection>& connection);
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// Promote all weak referecences in mActiveConnections vector to strong references and add them
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// to the output vector.
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void populateActiveConnections(SortedVector< sp<SensorEventConnection> >* activeConnections);
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// If SensorService is operating in RESTRICTED mode, only select whitelisted packages are
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// allowed to register for or call flush on sensors. Typically only cts test packages are
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// allowed.
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bool isWhiteListedPackage(const String8& packageName);
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// Reset the state of SensorService to NORMAL mode.
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status_t resetToNormalMode();
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status_t resetToNormalModeLocked();
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// constants
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Vector<Sensor> mSensorList;
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Vector<Sensor> mUserSensorListDebug;
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Vector<Sensor> mUserSensorList;
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DefaultKeyedVector<int, SensorInterface*> mSensorMap;
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Vector<SensorInterface *> mVirtualSensorList;
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status_t mInitCheck;
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// Socket buffersize used to initialize BitTube. This size depends on whether batching is
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// supported or not.
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uint32_t mSocketBufferSize;
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sp<Looper> mLooper;
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sp<SensorEventAckReceiver> mAckReceiver;
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// protected by mLock
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mutable Mutex mLock;
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DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
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DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors;
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SortedVector< wp<SensorEventConnection> > mActiveConnections;
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bool mWakeLockAcquired;
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sensors_event_t *mSensorEventBuffer, *mSensorEventScratch;
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SensorEventConnection const **mMapFlushEventsToConnections;
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Mode mCurrentOperatingMode;
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// The size of this vector is constant, only the items are mutable
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KeyedVector<int32_t, sensors_event_t> mLastEventSeen;
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public:
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void cleanupConnection(SensorEventConnection* connection);
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status_t enable(const sp<SensorEventConnection>& connection, int handle,
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nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs, int reservedFlags);
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status_t disable(const sp<SensorEventConnection>& connection, int handle);
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status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns);
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status_t flushSensor(const sp<SensorEventConnection>& connection);
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};
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_SENSOR_SERVICE_H
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