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229 lines
8.3 KiB
229 lines
8.3 KiB
/*
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* Copyright (C) 2015 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_INPUT_HUB_H_
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#define ANDROID_INPUT_HUB_H_
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include <utils/String8.h>
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#include <utils/Timers.h>
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namespace android {
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/**
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* InputEvent represents an event from the kernel. The fields largely mirror
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* those found in linux/input.h.
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*/
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struct InputEvent {
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nsecs_t when;
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int32_t type;
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int32_t code;
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int32_t value;
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};
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/** Describes an absolute axis. */
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struct AbsoluteAxisInfo {
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int32_t minValue = 0; // minimum value
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int32_t maxValue = 0; // maximum value
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int32_t flat = 0; // center flat position, e.g. flat == 8 means center is between -8 and 8
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int32_t fuzz = 0; // error tolerance, e.g. fuzz == 4 means value is +/- 4 due to noise
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int32_t resolution = 0; // resolution in units per mm or radians per mm
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};
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/**
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* An InputDeviceNode represents a device node in the Linux system. It can be
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* used to interact with the device, setting and getting property values.
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*
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* An InputDeviceNode should only be used on the same thread that is polling for
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* input events.
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*/
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class InputDeviceNode {
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public:
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/** Get the Linux device path for the node. */
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virtual const std::string& getPath() const = 0;
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/** Get the name of the device returned by the driver. */
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virtual const std::string& getName() const = 0;
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/** Get the location of the device returned by the driver. */
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virtual const std::string& getLocation() const = 0;
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/** Get the unique id of the device returned by the driver. */
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virtual const std::string& getUniqueId() const = 0;
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/** Get the bus type of the device returned by the driver. */
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virtual uint16_t getBusType() const = 0;
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/** Get the vendor id of the device returned by the driver. */
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virtual uint16_t getVendorId() const = 0;
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/** Get the product id of the device returned by the driver. */
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virtual uint16_t getProductId() const = 0;
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/** Get the version of the device driver. */
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virtual uint16_t getVersion() const = 0;
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/** Returns true if the device has the key. */
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virtual bool hasKey(int32_t key) const = 0;
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/** Returns true if the device has a key in the range [startKey, endKey). */
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virtual bool hasKeyInRange(int32_t startKey, int32_t endKey) const = 0;
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/** Returns true if the device has the relative axis. */
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virtual bool hasRelativeAxis(int32_t axis) const = 0;
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/** Returns true if the device has the absolute axis. */
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virtual bool hasAbsoluteAxis(int32_t axis) const = 0;
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/** Returns true if the device has the switch. */
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virtual bool hasSwitch(int32_t sw) const = 0;
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/** Returns true if the device has the force feedback method. */
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virtual bool hasForceFeedback(int32_t ff) const = 0;
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/** Returns true if the device has the input property. */
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virtual bool hasInputProperty(int property) const = 0;
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/** Returns the state of the key. */
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virtual int32_t getKeyState(int32_t key) const = 0;
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/** Returns the state of the switch. */
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virtual int32_t getSwitchState(int32_t sw) const = 0;
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/** Returns information about the absolute axis. */
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virtual const AbsoluteAxisInfo* getAbsoluteAxisInfo(int32_t axis) const = 0;
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/** Returns the value of the absolute axis. */
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virtual status_t getAbsoluteAxisValue(int32_t axis, int32_t* outValue) const = 0;
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/** Vibrate the device for duration ns. */
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virtual void vibrate(nsecs_t duration) = 0;
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/** Stop vibration on the device. */
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virtual void cancelVibrate() = 0;
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/** Disable key repeat for the device in the driver. */
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virtual void disableDriverKeyRepeat() = 0;
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protected:
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InputDeviceNode() = default;
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virtual ~InputDeviceNode() = default;
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};
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/** Callback interface for receiving input events, including device changes. */
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class InputCallbackInterface {
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public:
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virtual void onInputEvent(const std::shared_ptr<InputDeviceNode>& node, InputEvent& event,
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nsecs_t event_time) = 0;
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virtual void onDeviceAdded(const std::shared_ptr<InputDeviceNode>& node) = 0;
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virtual void onDeviceRemoved(const std::shared_ptr<InputDeviceNode>& node) = 0;
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protected:
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InputCallbackInterface() = default;
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virtual ~InputCallbackInterface() = default;
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};
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/**
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* InputHubInterface is responsible for monitoring a set of device paths and
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* executing callbacks when events occur. Before calling poll(), you should set
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* the device and input callbacks, and register your device path(s).
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*/
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class InputHubInterface {
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public:
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virtual status_t registerDevicePath(const std::string& path) = 0;
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virtual status_t unregisterDevicePath(const std::string& path) = 0;
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virtual status_t poll() = 0;
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virtual status_t wake() = 0;
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virtual void dump(String8& dump) = 0;
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protected:
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InputHubInterface() = default;
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virtual ~InputHubInterface() = default;
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};
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/**
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* An implementation of InputHubInterface that uses epoll to wait for events.
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*
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* This class is not threadsafe. Any functions called on the InputHub should be
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* called on the same thread that is used to call poll(). The only exception is
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* wake(), which may be used to return from poll() before an input or device
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* event occurs.
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*/
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class InputHub : public InputHubInterface {
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public:
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explicit InputHub(const std::shared_ptr<InputCallbackInterface>& cb);
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virtual ~InputHub() override;
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virtual status_t registerDevicePath(const std::string& path) override;
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virtual status_t unregisterDevicePath(const std::string& path) override;
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virtual status_t poll() override;
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virtual status_t wake() override;
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virtual void dump(String8& dump) override;
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private:
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status_t readNotify();
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status_t scanDir(const std::string& path);
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std::shared_ptr<InputDeviceNode> openNode(const std::string& path);
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status_t closeNode(const InputDeviceNode* node);
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status_t closeNodeByFd(int fd);
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std::shared_ptr<InputDeviceNode> findNodeByPath(const std::string& path);
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enum class WakeMechanism {
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/**
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* The kernel supports the EPOLLWAKEUP flag for epoll_ctl.
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*
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* When using this mechanism, epoll_wait will internally acquire a wake
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* lock whenever one of the FDs it is monitoring becomes ready. The wake
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* lock is held automatically by the kernel until the next call to
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* epoll_wait.
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*
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* This mechanism only exists in Linux kernel 3.5+.
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*/
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EPOLL_WAKEUP,
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/**
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* The kernel evdev driver supports the EVIOCSSUSPENDBLOCK ioctl.
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*
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* When using this mechanism, the InputHub asks evdev to acquire and
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* hold a wake lock whenever its buffer is non-empty. We must take care
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* to acquire our own userspace wake lock before draining the buffer to
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* prevent actually going back into suspend before we have fully
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* processed all of the events.
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*
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* This mechanism only exists in older Android Linux kernels.
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*/
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LEGACY_EVDEV_SUSPENDBLOCK_IOCTL,
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/**
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* The kernel doesn't seem to support any special wake mechanism.
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*
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* We explicitly acquire and release wake locks when processing input
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* events.
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*/
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LEGACY_EVDEV_EXPLICIT_WAKE_LOCKS,
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};
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WakeMechanism mWakeupMechanism = WakeMechanism::LEGACY_EVDEV_EXPLICIT_WAKE_LOCKS;
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bool manageWakeLocks() const;
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bool mNeedToCheckSuspendBlockIoctl = true;
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int mEpollFd;
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int mINotifyFd;
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int mWakeEventFd;
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// Callback for input events
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std::shared_ptr<InputCallbackInterface> mInputCallback;
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// Map from watch descriptors to watched paths
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std::unordered_map<int, std::string> mWatchedPaths;
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// Map from file descriptors to InputDeviceNodes
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std::unordered_map<int, std::shared_ptr<InputDeviceNode>> mDeviceNodes;
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};
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} // namespace android
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#endif // ANDROID_INPUT_HUB_H_
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