services/inputflinger/reader/include/InputDevice.h - android_frameworks_native - Gitiles

 /*
  * Copyright (C) 2019 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.
  */

 #pragma once

 #include <ftl/flags.h>
 #include <input/DisplayViewport.h>
 #include <input/InputDevice.h>
 #include <input/PropertyMap.h>

 #include <cstdint>
 #include <optional>
 #include <unordered_map>
 #include <vector>

 #include "EventHub.h"
 #include "InputReaderBase.h"
 #include "InputReaderContext.h"
 #include "NotifyArgs.h"

 namespace android {

 class PeripheralController;
 class PeripheralControllerInterface;
 class InputDeviceContext;
 class InputMapper;

 /* Represents the state of a single input device. */
 class InputDevice {
 public:
     InputDevice(InputReaderContext* context, int32_t id, int32_t generation,
                 const InputDeviceIdentifier& identifier);
     ~InputDevice();

     inline InputReaderContext* getContext() { return mContext; }
     inline int32_t getId() const { return mId; }
     inline int32_t getControllerNumber() const { return mControllerNumber; }
     inline int32_t getGeneration() const { return mGeneration; }
     inline const std::string getName() const { return mIdentifier.name; }
     inline const std::string getDescriptor() { return mIdentifier.descriptor; }
     inline std::optional<std::string> getBluetoothAddress() const {
         return mIdentifier.bluetoothAddress;
     }
     inline const std::string getLocation() const { return mIdentifier.location; }
     inline ftl::Flags<InputDeviceClass> getClasses() const { return mClasses; }
     inline uint32_t getSources() const { return mSources; }
     inline bool hasEventHubDevices() const { return !mDevices.empty(); }

     inline bool isExternal() { return mIsExternal; }
     inline std::optional<uint8_t> getAssociatedDisplayPort() const {
         return mAssociatedDisplayPort;
     }
     inline std::optional<std::string> getAssociatedDisplayUniqueId() const {
         return mAssociatedDisplayUniqueId;
     }
     inline std::optional<std::string> getDeviceTypeAssociation() const {
         return mAssociatedDeviceType;
     }
     inline std::optional<DisplayViewport> getAssociatedViewport() const {
         return mAssociatedViewport;
     }
     inline bool hasMic() const { return mHasMic; }

     inline bool isIgnored() { return !getMapperCount(); }

     bool isEnabled();
     [[nodiscard]] std::list<NotifyArgs> setEnabled(bool enabled, nsecs_t when);

     void dump(std::string& dump, const std::string& eventHubDevStr);
     void addEventHubDevice(int32_t eventHubId, bool populateMappers = true);
     void removeEventHubDevice(int32_t eventHubId);
     [[nodiscard]] std::list<NotifyArgs> configure(nsecs_t when,
                                                   const InputReaderConfiguration* config,
                                                   uint32_t changes);
     [[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when);
     [[nodiscard]] std::list<NotifyArgs> process(const RawEvent* rawEvents, size_t count);
     [[nodiscard]] std::list<NotifyArgs> timeoutExpired(nsecs_t when);
     [[nodiscard]] std::list<NotifyArgs> updateExternalStylusState(const StylusState& state);

     InputDeviceInfo getDeviceInfo();
     int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
     int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
     int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode);
     int32_t getKeyCodeForKeyLocation(int32_t locationKeyCode) const;
     bool markSupportedKeyCodes(uint32_t sourceMask, const std::vector<int32_t>& keyCodes,
                                uint8_t* outFlags);
     [[nodiscard]] std::list<NotifyArgs> vibrate(const VibrationSequence& sequence, ssize_t repeat,
                                                 int32_t token);
     [[nodiscard]] std::list<NotifyArgs> cancelVibrate(int32_t token);
     bool isVibrating();
     std::vector<int32_t> getVibratorIds();
     [[nodiscard]] std::list<NotifyArgs> cancelTouch(nsecs_t when, nsecs_t readTime);
     bool enableSensor(InputDeviceSensorType sensorType, std::chrono::microseconds samplingPeriod,
                       std::chrono::microseconds maxBatchReportLatency);
     void disableSensor(InputDeviceSensorType sensorType);
     void flushSensor(InputDeviceSensorType sensorType);

     std::optional<int32_t> getBatteryEventHubId() const;

     bool setLightColor(int32_t lightId, int32_t color);
     bool setLightPlayerId(int32_t lightId, int32_t playerId);
     std::optional<int32_t> getLightColor(int32_t lightId);
     std::optional<int32_t> getLightPlayerId(int32_t lightId);

     int32_t getMetaState();
     void updateMetaState(int32_t keyCode);

     void addKeyRemapping(int32_t fromKeyCode, int32_t toKeyCode);

     void bumpGeneration();

     [[nodiscard]] NotifyDeviceResetArgs notifyReset(nsecs_t when);

     inline const PropertyMap& getConfiguration() { return mConfiguration; }
     inline EventHubInterface* getEventHub() { return mContext->getEventHub(); }

     std::optional<int32_t> getAssociatedDisplayId();

     void updateLedState(bool reset);

     size_t getMapperCount();

     // construct and add a mapper to the input device
     template <class T, typename... Args>
     T& addMapper(int32_t eventHubId, Args... args) {
         // ensure a device entry exists for this eventHubId
         addEventHubDevice(eventHubId, false);

         // create mapper
         auto& devicePair = mDevices[eventHubId];
         auto& deviceContext = devicePair.first;
         auto& mappers = devicePair.second;
         T* mapper = new T(*deviceContext, args...);
         mappers.emplace_back(mapper);
         return *mapper;
     }

     // construct and add a controller to the input device
     template <class T>
     T& addController(int32_t eventHubId) {
         // ensure a device entry exists for this eventHubId
         addEventHubDevice(eventHubId, false);

         // create controller
         auto& devicePair = mDevices[eventHubId];
         auto& deviceContext = devicePair.first;

         mController = std::make_unique<T>(*deviceContext);
         return *(reinterpret_cast<T*>(mController.get()));
     }

 private:
     InputReaderContext* mContext;
     int32_t mId;
     int32_t mGeneration;
     int32_t mControllerNumber;
     hardware::input::InputDeviceCountryCode mCountryCode;
     InputDeviceIdentifier mIdentifier;
     std::string mAlias;
     ftl::Flags<InputDeviceClass> mClasses;

     // map from eventHubId to device context and mappers
     using MapperVector = std::vector<std::unique_ptr<InputMapper>>;
     using DevicePair = std::pair<std::unique_ptr<InputDeviceContext>, MapperVector>;
     // Map from EventHub ID to pair of device context and vector of mapper.
     std::unordered_map<int32_t, DevicePair> mDevices;
     // Misc devices controller for lights, battery, etc.
     std::unique_ptr<PeripheralControllerInterface> mController;

     uint32_t mSources;
     bool mIsExternal;
     std::optional<uint8_t> mAssociatedDisplayPort;
     std::optional<std::string> mAssociatedDisplayUniqueId;
     std::optional<std::string> mAssociatedDeviceType;
     std::optional<DisplayViewport> mAssociatedViewport;
     bool mHasMic;
     bool mDropUntilNextSync;

     typedef int32_t (InputMapper::*GetStateFunc)(uint32_t sourceMask, int32_t code);
     int32_t getState(uint32_t sourceMask, int32_t code, GetStateFunc getStateFunc);

     PropertyMap mConfiguration;

     // helpers to interate over the devices collection
     // run a function against every mapper on every subdevice
     inline void for_each_mapper(std::function<void(InputMapper&)> f) {
         for (auto& deviceEntry : mDevices) {
             auto& devicePair = deviceEntry.second;
             auto& mappers = devicePair.second;
             for (auto& mapperPtr : mappers) {
                 f(*mapperPtr);
             }
         }
     }

     // run a function against every mapper on a specific subdevice
     inline void for_each_mapper_in_subdevice(int32_t eventHubDevice,
                                              std::function<void(InputMapper&)> f) {
         auto deviceIt = mDevices.find(eventHubDevice);
         if (deviceIt != mDevices.end()) {
             auto& devicePair = deviceIt->second;
             auto& mappers = devicePair.second;
             for (auto& mapperPtr : mappers) {
                 f(*mapperPtr);
             }
         }
     }

     // run a function against every subdevice
     inline void for_each_subdevice(std::function<void(InputDeviceContext&)> f) {
         for (auto& deviceEntry : mDevices) {
             auto& devicePair = deviceEntry.second;
             auto& contextPtr = devicePair.first;
             f(*contextPtr);
         }
     }

     // return the first value returned by a function over every mapper.
     // if all mappers return nullopt, return nullopt.
     template <typename T>
     inline std::optional<T> first_in_mappers(
             std::function<std::optional<T>(InputMapper&)> f) const {
         for (auto& deviceEntry : mDevices) {
             auto& devicePair = deviceEntry.second;
             auto& mappers = devicePair.second;
             for (auto& mapperPtr : mappers) {
                 std::optional<T> ret = f(*mapperPtr);
                 if (ret) {
                     return ret;
                 }
             }
         }
         return std::nullopt;
     }
 };

 /* Provides access to EventHub methods, but limits access to the current InputDevice.
  * Essentially an implementation of EventHubInterface, but for a specific device id.
  * Helps hide implementation details of InputDevice and EventHub. Used by mappers to
  * check the status of the associated hardware device
  */
 class InputDeviceContext {
 public:
     InputDeviceContext(InputDevice& device, int32_t eventHubId);
     ~InputDeviceContext();

     inline InputReaderContext* getContext() { return mContext; }
     inline int32_t getId() { return mDeviceId; }
     inline int32_t getEventHubId() { return mId; }

     inline ftl::Flags<InputDeviceClass> getDeviceClasses() const {
         return mEventHub->getDeviceClasses(mId);
     }
     inline InputDeviceIdentifier getDeviceIdentifier() const {
         return mEventHub->getDeviceIdentifier(mId);
     }
     inline int32_t getDeviceControllerNumber() const {
         return mEventHub->getDeviceControllerNumber(mId);
     }
     inline void getConfiguration(PropertyMap* outConfiguration) const {
         return mEventHub->getConfiguration(mId, outConfiguration);
     }
     inline status_t getAbsoluteAxisInfo(int32_t code, RawAbsoluteAxisInfo* axisInfo) const {
         return mEventHub->getAbsoluteAxisInfo(mId, code, axisInfo);
     }
     inline bool hasRelativeAxis(int32_t code) const {
         return mEventHub->hasRelativeAxis(mId, code);
     }
     inline bool hasInputProperty(int32_t property) const {
         return mEventHub->hasInputProperty(mId, property);
     }

     inline bool hasMscEvent(int mscEvent) const { return mEventHub->hasMscEvent(mId, mscEvent); }

     inline void addKeyRemapping(int32_t fromKeyCode, int32_t toKeyCode) const {
         mEventHub->addKeyRemapping(mId, fromKeyCode, toKeyCode);
     }

     inline status_t mapKey(int32_t scanCode, int32_t usageCode, int32_t metaState,
                            int32_t* outKeycode, int32_t* outMetaState, uint32_t* outFlags) const {
         return mEventHub->mapKey(mId, scanCode, usageCode, metaState, outKeycode, outMetaState,
                                  outFlags);
     }
     inline status_t mapAxis(int32_t scanCode, AxisInfo* outAxisInfo) const {
         return mEventHub->mapAxis(mId, scanCode, outAxisInfo);
     }
     inline base::Result<std::pair<InputDeviceSensorType, int32_t>> mapSensor(int32_t absCode) {
         return mEventHub->mapSensor(mId, absCode);
     }

     inline const std::vector<int32_t> getRawLightIds() { return mEventHub->getRawLightIds(mId); }

     inline std::optional<RawLightInfo> getRawLightInfo(int32_t lightId) {
         return mEventHub->getRawLightInfo(mId, lightId);
     }

     inline std::optional<int32_t> getLightBrightness(int32_t lightId) {
         return mEventHub->getLightBrightness(mId, lightId);
     }

     inline void setLightBrightness(int32_t lightId, int32_t brightness) {
         return mEventHub->setLightBrightness(mId, lightId, brightness);
     }

     inline std::optional<std::unordered_map<LightColor, int32_t>> getLightIntensities(
             int32_t lightId) {
         return mEventHub->getLightIntensities(mId, lightId);
     }

     inline void setLightIntensities(int32_t lightId,
                                     std::unordered_map<LightColor, int32_t> intensities) {
         return mEventHub->setLightIntensities(mId, lightId, intensities);
     }

     inline std::vector<TouchVideoFrame> getVideoFrames() { return mEventHub->getVideoFrames(mId); }
     inline hardware::input::InputDeviceCountryCode getCountryCode() const {
         return mEventHub->getCountryCode(mId);
     }
     inline int32_t getScanCodeState(int32_t scanCode) const {
         return mEventHub->getScanCodeState(mId, scanCode);
     }
     inline int32_t getKeyCodeState(int32_t keyCode) const {
         return mEventHub->getKeyCodeState(mId, keyCode);
     }
     inline int32_t getKeyCodeForKeyLocation(int32_t locationKeyCode) const {
         return mEventHub->getKeyCodeForKeyLocation(mId, locationKeyCode);
     }
     inline int32_t getSwitchState(int32_t sw) const { return mEventHub->getSwitchState(mId, sw); }
     inline status_t getAbsoluteAxisValue(int32_t code, int32_t* outValue) const {
         return mEventHub->getAbsoluteAxisValue(mId, code, outValue);
     }
     inline bool markSupportedKeyCodes(const std::vector<int32_t>& keyCodes,
                                       uint8_t* outFlags) const {
         return mEventHub->markSupportedKeyCodes(mId, keyCodes, outFlags);
     }
     inline bool hasScanCode(int32_t scanCode) const {
         return mEventHub->hasScanCode(mId, scanCode);
     }
     inline bool hasKeyCode(int32_t keyCode) const { return mEventHub->hasKeyCode(mId, keyCode); }
     inline bool hasLed(int32_t led) const { return mEventHub->hasLed(mId, led); }
     inline void setLedState(int32_t led, bool on) { return mEventHub->setLedState(mId, led, on); }
     inline void getVirtualKeyDefinitions(std::vector<VirtualKeyDefinition>& outVirtualKeys) const {
         return mEventHub->getVirtualKeyDefinitions(mId, outVirtualKeys);
     }
     inline const std::shared_ptr<KeyCharacterMap> getKeyCharacterMap() const {
         return mEventHub->getKeyCharacterMap(mId);
     }
     inline bool setKeyboardLayoutOverlay(std::shared_ptr<KeyCharacterMap> map) {
         return mEventHub->setKeyboardLayoutOverlay(mId, map);
     }
     inline void vibrate(const VibrationElement& element) {
         return mEventHub->vibrate(mId, element);
     }
     inline void cancelVibrate() { return mEventHub->cancelVibrate(mId); }

     inline std::vector<int32_t> getVibratorIds() { return mEventHub->getVibratorIds(mId); }

     inline const std::vector<int32_t> getRawBatteryIds() {
         return mEventHub->getRawBatteryIds(mId);
     }

     inline std::optional<RawBatteryInfo> getRawBatteryInfo(int32_t batteryId) {
         return mEventHub->getRawBatteryInfo(mId, batteryId);
     }

     inline std::optional<int32_t> getBatteryCapacity(int32_t batteryId) {
         return mEventHub->getBatteryCapacity(mId, batteryId);
     }

     inline std::optional<int32_t> getBatteryStatus(int32_t batteryId) {
         return mEventHub->getBatteryStatus(mId, batteryId);
     }

     inline bool hasAbsoluteAxis(int32_t code) const {
         RawAbsoluteAxisInfo info;
         mEventHub->getAbsoluteAxisInfo(mId, code, &info);
         return info.valid;
     }
     inline bool isKeyPressed(int32_t scanCode) const {
         return mEventHub->getScanCodeState(mId, scanCode) == AKEY_STATE_DOWN;
     }
     inline bool isKeyCodePressed(int32_t keyCode) const {
         return mEventHub->getKeyCodeState(mId, keyCode) == AKEY_STATE_DOWN;
     }
     inline int32_t getAbsoluteAxisValue(int32_t code) const {
         int32_t value;
         mEventHub->getAbsoluteAxisValue(mId, code, &value);
         return value;
     }
     inline bool isDeviceEnabled() { return mEventHub->isDeviceEnabled(mId); }
     inline status_t enableDevice() { return mEventHub->enableDevice(mId); }
     inline status_t disableDevice() { return mEventHub->disableDevice(mId); }

     inline const std::string getName() const { return mDevice.getName(); }
     inline const std::string getDescriptor() { return mDevice.getDescriptor(); }
     inline const std::string getLocation() { return mDevice.getLocation(); }
     inline bool isExternal() { return mDevice.isExternal(); }
     inline std::optional<uint8_t> getAssociatedDisplayPort() const {
         return mDevice.getAssociatedDisplayPort();
     }
     inline std::optional<std::string> getAssociatedDisplayUniqueId() const {
         return mDevice.getAssociatedDisplayUniqueId();
     }
     inline std::optional<std::string> getDeviceTypeAssociation() const {
         return mDevice.getDeviceTypeAssociation();
     }
     inline std::optional<DisplayViewport> getAssociatedViewport() const {
         return mDevice.getAssociatedViewport();
     }
     [[nodiscard]] inline std::list<NotifyArgs> cancelTouch(nsecs_t when, nsecs_t readTime) {
         return mDevice.cancelTouch(when, readTime);
     }
     inline void bumpGeneration() { mDevice.bumpGeneration(); }
     inline const PropertyMap& getConfiguration() { return mDevice.getConfiguration(); }

 private:
     InputDevice& mDevice;
     InputReaderContext* mContext;
     EventHubInterface* mEventHub;
     int32_t mId;
     int32_t mDeviceId;
 };

 } // namespace android
	/*
	* Copyright (C) 2019 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.
	*/

	#pragma once

	#include <ftl/flags.h>
	#include <input/DisplayViewport.h>
	#include <input/InputDevice.h>
	#include <input/PropertyMap.h>

	#include <cstdint>
	#include <optional>
	#include <unordered_map>
	#include <vector>

	#include "EventHub.h"
	#include "InputReaderBase.h"
	#include "InputReaderContext.h"
	#include "NotifyArgs.h"

	namespace android {

	class PeripheralController;
	class PeripheralControllerInterface;
	class InputDeviceContext;
	class InputMapper;

	/* Represents the state of a single input device. */
	class InputDevice {
	public:
	InputDevice(InputReaderContext* context, int32_t id, int32_t generation,
	const InputDeviceIdentifier& identifier);
	~InputDevice();

	inline InputReaderContext* getContext() { return mContext; }
	inline int32_t getId() const { return mId; }
	inline int32_t getControllerNumber() const { return mControllerNumber; }
	inline int32_t getGeneration() const { return mGeneration; }
	inline const std::string getName() const { return mIdentifier.name; }
	inline const std::string getDescriptor() { return mIdentifier.descriptor; }
	inline std::optional<std::string> getBluetoothAddress() const {
	return mIdentifier.bluetoothAddress;
	}
	inline const std::string getLocation() const { return mIdentifier.location; }
	inline ftl::Flags<InputDeviceClass> getClasses() const { return mClasses; }
	inline uint32_t getSources() const { return mSources; }
	inline bool hasEventHubDevices() const { return !mDevices.empty(); }

	inline bool isExternal() { return mIsExternal; }
	inline std::optional<uint8_t> getAssociatedDisplayPort() const {
	return mAssociatedDisplayPort;
	}
	inline std::optional<std::string> getAssociatedDisplayUniqueId() const {
	return mAssociatedDisplayUniqueId;
	}
	inline std::optional<std::string> getDeviceTypeAssociation() const {
	return mAssociatedDeviceType;
	}
	inline std::optional<DisplayViewport> getAssociatedViewport() const {
	return mAssociatedViewport;
	}
	inline bool hasMic() const { return mHasMic; }

	inline bool isIgnored() { return !getMapperCount(); }

	bool isEnabled();
	[[nodiscard]] std::list<NotifyArgs> setEnabled(bool enabled, nsecs_t when);

	void dump(std::string& dump, const std::string& eventHubDevStr);
	void addEventHubDevice(int32_t eventHubId, bool populateMappers = true);
	void removeEventHubDevice(int32_t eventHubId);
	[[nodiscard]] std::list<NotifyArgs> configure(nsecs_t when,
	const InputReaderConfiguration* config,
	uint32_t changes);
	[[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when);
	[[nodiscard]] std::list<NotifyArgs> process(const RawEvent* rawEvents, size_t count);
	[[nodiscard]] std::list<NotifyArgs> timeoutExpired(nsecs_t when);
	[[nodiscard]] std::list<NotifyArgs> updateExternalStylusState(const StylusState& state);

	InputDeviceInfo getDeviceInfo();
	int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode);
	int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
	int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode);
	int32_t getKeyCodeForKeyLocation(int32_t locationKeyCode) const;
	bool markSupportedKeyCodes(uint32_t sourceMask, const std::vector<int32_t>& keyCodes,
	uint8_t* outFlags);
	[[nodiscard]] std::list<NotifyArgs> vibrate(const VibrationSequence& sequence, ssize_t repeat,
	int32_t token);
	[[nodiscard]] std::list<NotifyArgs> cancelVibrate(int32_t token);
	bool isVibrating();
	std::vector<int32_t> getVibratorIds();
	[[nodiscard]] std::list<NotifyArgs> cancelTouch(nsecs_t when, nsecs_t readTime);
	bool enableSensor(InputDeviceSensorType sensorType, std::chrono::microseconds samplingPeriod,
	std::chrono::microseconds maxBatchReportLatency);
	void disableSensor(InputDeviceSensorType sensorType);
	void flushSensor(InputDeviceSensorType sensorType);

	std::optional<int32_t> getBatteryEventHubId() const;

	bool setLightColor(int32_t lightId, int32_t color);
	bool setLightPlayerId(int32_t lightId, int32_t playerId);
	std::optional<int32_t> getLightColor(int32_t lightId);
	std::optional<int32_t> getLightPlayerId(int32_t lightId);

	int32_t getMetaState();
	void updateMetaState(int32_t keyCode);

	void addKeyRemapping(int32_t fromKeyCode, int32_t toKeyCode);

	void bumpGeneration();

	[[nodiscard]] NotifyDeviceResetArgs notifyReset(nsecs_t when);

	inline const PropertyMap& getConfiguration() { return mConfiguration; }
	inline EventHubInterface* getEventHub() { return mContext->getEventHub(); }

	std::optional<int32_t> getAssociatedDisplayId();

	void updateLedState(bool reset);

	size_t getMapperCount();

	// construct and add a mapper to the input device
	template <class T, typename... Args>
	T& addMapper(int32_t eventHubId, Args... args) {
	// ensure a device entry exists for this eventHubId
	addEventHubDevice(eventHubId, false);

	// create mapper
	auto& devicePair = mDevices[eventHubId];
	auto& deviceContext = devicePair.first;
	auto& mappers = devicePair.second;
	T* mapper = new T(*deviceContext, args...);
	mappers.emplace_back(mapper);
	return *mapper;
	}

	// construct and add a controller to the input device
	template <class T>
	T& addController(int32_t eventHubId) {
	// ensure a device entry exists for this eventHubId
	addEventHubDevice(eventHubId, false);

	// create controller
	auto& devicePair = mDevices[eventHubId];
	auto& deviceContext = devicePair.first;

	mController = std::make_unique<T>(*deviceContext);
	return (reinterpret_cast<T>(mController.get()));
	}

	private:
	InputReaderContext* mContext;
	int32_t mId;
	int32_t mGeneration;
	int32_t mControllerNumber;
	hardware::input::InputDeviceCountryCode mCountryCode;
	InputDeviceIdentifier mIdentifier;
	std::string mAlias;
	ftl::Flags<InputDeviceClass> mClasses;

	// map from eventHubId to device context and mappers
	using MapperVector = std::vector<std::unique_ptr<InputMapper>>;
	using DevicePair = std::pair<std::unique_ptr<InputDeviceContext>, MapperVector>;
	// Map from EventHub ID to pair of device context and vector of mapper.
	std::unordered_map<int32_t, DevicePair> mDevices;
	// Misc devices controller for lights, battery, etc.
	std::unique_ptr<PeripheralControllerInterface> mController;

	uint32_t mSources;
	bool mIsExternal;
	std::optional<uint8_t> mAssociatedDisplayPort;
	std::optional<std::string> mAssociatedDisplayUniqueId;
	std::optional<std::string> mAssociatedDeviceType;
	std::optional<DisplayViewport> mAssociatedViewport;
	bool mHasMic;
	bool mDropUntilNextSync;

	typedef int32_t (InputMapper::*GetStateFunc)(uint32_t sourceMask, int32_t code);
	int32_t getState(uint32_t sourceMask, int32_t code, GetStateFunc getStateFunc);

	PropertyMap mConfiguration;

	// helpers to interate over the devices collection
	// run a function against every mapper on every subdevice
	inline void for_each_mapper(std::function<void(InputMapper&)> f) {
	for (auto& deviceEntry : mDevices) {
	auto& devicePair = deviceEntry.second;
	auto& mappers = devicePair.second;
	for (auto& mapperPtr : mappers) {
	f(*mapperPtr);
	}
	}
	}

	// run a function against every mapper on a specific subdevice
	inline void for_each_mapper_in_subdevice(int32_t eventHubDevice,
	std::function<void(InputMapper&)> f) {
	auto deviceIt = mDevices.find(eventHubDevice);
	if (deviceIt != mDevices.end()) {
	auto& devicePair = deviceIt->second;
	auto& mappers = devicePair.second;
	for (auto& mapperPtr : mappers) {
	f(*mapperPtr);
	}
	}
	}

	// run a function against every subdevice
	inline void for_each_subdevice(std::function<void(InputDeviceContext&)> f) {
	for (auto& deviceEntry : mDevices) {
	auto& devicePair = deviceEntry.second;
	auto& contextPtr = devicePair.first;
	f(*contextPtr);
	}
	}

	// return the first value returned by a function over every mapper.
	// if all mappers return nullopt, return nullopt.
	template <typename T>
	inline std::optional<T> first_in_mappers(
	std::function<std::optional<T>(InputMapper&)> f) const {
	for (auto& deviceEntry : mDevices) {
	auto& devicePair = deviceEntry.second;
	auto& mappers = devicePair.second;
	for (auto& mapperPtr : mappers) {
	std::optional<T> ret = f(*mapperPtr);
	if (ret) {
	return ret;
	}
	}
	}
	return std::nullopt;
	}
	};

	/* Provides access to EventHub methods, but limits access to the current InputDevice.
	* Essentially an implementation of EventHubInterface, but for a specific device id.
	* Helps hide implementation details of InputDevice and EventHub. Used by mappers to
	* check the status of the associated hardware device
	*/
	class InputDeviceContext {
	public:
	InputDeviceContext(InputDevice& device, int32_t eventHubId);
	~InputDeviceContext();

	inline InputReaderContext* getContext() { return mContext; }
	inline int32_t getId() { return mDeviceId; }
	inline int32_t getEventHubId() { return mId; }

	inline ftl::Flags<InputDeviceClass> getDeviceClasses() const {
	return mEventHub->getDeviceClasses(mId);
	}
	inline InputDeviceIdentifier getDeviceIdentifier() const {
	return mEventHub->getDeviceIdentifier(mId);
	}
	inline int32_t getDeviceControllerNumber() const {
	return mEventHub->getDeviceControllerNumber(mId);
	}
	inline void getConfiguration(PropertyMap* outConfiguration) const {
	return mEventHub->getConfiguration(mId, outConfiguration);
	}
	inline status_t getAbsoluteAxisInfo(int32_t code, RawAbsoluteAxisInfo* axisInfo) const {
	return mEventHub->getAbsoluteAxisInfo(mId, code, axisInfo);
	}
	inline bool hasRelativeAxis(int32_t code) const {
	return mEventHub->hasRelativeAxis(mId, code);
	}
	inline bool hasInputProperty(int32_t property) const {
	return mEventHub->hasInputProperty(mId, property);
	}

	inline bool hasMscEvent(int mscEvent) const { return mEventHub->hasMscEvent(mId, mscEvent); }

	inline void addKeyRemapping(int32_t fromKeyCode, int32_t toKeyCode) const {
	mEventHub->addKeyRemapping(mId, fromKeyCode, toKeyCode);
	}

	inline status_t mapKey(int32_t scanCode, int32_t usageCode, int32_t metaState,
	int32_t* outKeycode, int32_t* outMetaState, uint32_t* outFlags) const {
	return mEventHub->mapKey(mId, scanCode, usageCode, metaState, outKeycode, outMetaState,
	outFlags);
	}
	inline status_t mapAxis(int32_t scanCode, AxisInfo* outAxisInfo) const {
	return mEventHub->mapAxis(mId, scanCode, outAxisInfo);
	}
	inline base::Result<std::pair<InputDeviceSensorType, int32_t>> mapSensor(int32_t absCode) {
	return mEventHub->mapSensor(mId, absCode);
	}

	inline const std::vector<int32_t> getRawLightIds() { return mEventHub->getRawLightIds(mId); }

	inline std::optional<RawLightInfo> getRawLightInfo(int32_t lightId) {
	return mEventHub->getRawLightInfo(mId, lightId);
	}

	inline std::optional<int32_t> getLightBrightness(int32_t lightId) {
	return mEventHub->getLightBrightness(mId, lightId);
	}

	inline void setLightBrightness(int32_t lightId, int32_t brightness) {
	return mEventHub->setLightBrightness(mId, lightId, brightness);
	}

	inline std::optional<std::unordered_map<LightColor, int32_t>> getLightIntensities(
	int32_t lightId) {
	return mEventHub->getLightIntensities(mId, lightId);
	}

	inline void setLightIntensities(int32_t lightId,
	std::unordered_map<LightColor, int32_t> intensities) {
	return mEventHub->setLightIntensities(mId, lightId, intensities);
	}

	inline std::vector<TouchVideoFrame> getVideoFrames() { return mEventHub->getVideoFrames(mId); }
	inline hardware::input::InputDeviceCountryCode getCountryCode() const {
	return mEventHub->getCountryCode(mId);
	}
	inline int32_t getScanCodeState(int32_t scanCode) const {
	return mEventHub->getScanCodeState(mId, scanCode);
	}
	inline int32_t getKeyCodeState(int32_t keyCode) const {
	return mEventHub->getKeyCodeState(mId, keyCode);
	}
	inline int32_t getKeyCodeForKeyLocation(int32_t locationKeyCode) const {
	return mEventHub->getKeyCodeForKeyLocation(mId, locationKeyCode);
	}
	inline int32_t getSwitchState(int32_t sw) const { return mEventHub->getSwitchState(mId, sw); }
	inline status_t getAbsoluteAxisValue(int32_t code, int32_t* outValue) const {
	return mEventHub->getAbsoluteAxisValue(mId, code, outValue);
	}
	inline bool markSupportedKeyCodes(const std::vector<int32_t>& keyCodes,
	uint8_t* outFlags) const {
	return mEventHub->markSupportedKeyCodes(mId, keyCodes, outFlags);
	}
	inline bool hasScanCode(int32_t scanCode) const {
	return mEventHub->hasScanCode(mId, scanCode);
	}
	inline bool hasKeyCode(int32_t keyCode) const { return mEventHub->hasKeyCode(mId, keyCode); }
	inline bool hasLed(int32_t led) const { return mEventHub->hasLed(mId, led); }
	inline void setLedState(int32_t led, bool on) { return mEventHub->setLedState(mId, led, on); }
	inline void getVirtualKeyDefinitions(std::vector<VirtualKeyDefinition>& outVirtualKeys) const {
	return mEventHub->getVirtualKeyDefinitions(mId, outVirtualKeys);
	}
	inline const std::shared_ptr<KeyCharacterMap> getKeyCharacterMap() const {
	return mEventHub->getKeyCharacterMap(mId);
	}
	inline bool setKeyboardLayoutOverlay(std::shared_ptr<KeyCharacterMap> map) {
	return mEventHub->setKeyboardLayoutOverlay(mId, map);
	}
	inline void vibrate(const VibrationElement& element) {
	return mEventHub->vibrate(mId, element);
	}
	inline void cancelVibrate() { return mEventHub->cancelVibrate(mId); }

	inline std::vector<int32_t> getVibratorIds() { return mEventHub->getVibratorIds(mId); }

	inline const std::vector<int32_t> getRawBatteryIds() {
	return mEventHub->getRawBatteryIds(mId);
	}

	inline std::optional<RawBatteryInfo> getRawBatteryInfo(int32_t batteryId) {
	return mEventHub->getRawBatteryInfo(mId, batteryId);
	}

	inline std::optional<int32_t> getBatteryCapacity(int32_t batteryId) {
	return mEventHub->getBatteryCapacity(mId, batteryId);
	}

	inline std::optional<int32_t> getBatteryStatus(int32_t batteryId) {
	return mEventHub->getBatteryStatus(mId, batteryId);
	}

	inline bool hasAbsoluteAxis(int32_t code) const {
	RawAbsoluteAxisInfo info;
	mEventHub->getAbsoluteAxisInfo(mId, code, &info);
	return info.valid;
	}
	inline bool isKeyPressed(int32_t scanCode) const {
	return mEventHub->getScanCodeState(mId, scanCode) == AKEY_STATE_DOWN;
	}
	inline bool isKeyCodePressed(int32_t keyCode) const {
	return mEventHub->getKeyCodeState(mId, keyCode) == AKEY_STATE_DOWN;
	}
	inline int32_t getAbsoluteAxisValue(int32_t code) const {
	int32_t value;
	mEventHub->getAbsoluteAxisValue(mId, code, &value);
	return value;
	}
	inline bool isDeviceEnabled() { return mEventHub->isDeviceEnabled(mId); }
	inline status_t enableDevice() { return mEventHub->enableDevice(mId); }
	inline status_t disableDevice() { return mEventHub->disableDevice(mId); }

	inline const std::string getName() const { return mDevice.getName(); }
	inline const std::string getDescriptor() { return mDevice.getDescriptor(); }
	inline const std::string getLocation() { return mDevice.getLocation(); }
	inline bool isExternal() { return mDevice.isExternal(); }
	inline std::optional<uint8_t> getAssociatedDisplayPort() const {
	return mDevice.getAssociatedDisplayPort();
	}
	inline std::optional<std::string> getAssociatedDisplayUniqueId() const {
	return mDevice.getAssociatedDisplayUniqueId();
	}
	inline std::optional<std::string> getDeviceTypeAssociation() const {
	return mDevice.getDeviceTypeAssociation();
	}
	inline std::optional<DisplayViewport> getAssociatedViewport() const {
	return mDevice.getAssociatedViewport();
	}
	[[nodiscard]] inline std::list<NotifyArgs> cancelTouch(nsecs_t when, nsecs_t readTime) {
	return mDevice.cancelTouch(when, readTime);
	}
	inline void bumpGeneration() { mDevice.bumpGeneration(); }
	inline const PropertyMap& getConfiguration() { return mDevice.getConfiguration(); }

	private:
	InputDevice& mDevice;
	InputReaderContext* mContext;
	EventHubInterface* mEventHub;
	int32_t mId;
	int32_t mDeviceId;
	};

	} // namespace android