/* * Copyright (C) 2005 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 _RUNTIME_EVENT_HUB_H #define _RUNTIME_EVENT_HUB_H #include #include #include #include #include #include #include #include /* These constants are not defined in linux/input.h but they are part of the multitouch * input protocol. */ #define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */ #define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */ #define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */ #define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */ #define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */ #define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */ #define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */ #define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device (finger, pen, ...) */ #define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */ #define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */ #define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */ #define MT_TOOL_FINGER 0 /* Identifies a finger */ #define MT_TOOL_PEN 1 /* Identifies a pen */ #define SYN_MT_REPORT 2 /* Convenience constants. */ #define BTN_FIRST 0x100 // first button scancode #define BTN_LAST 0x15f // last button scancode struct pollfd; namespace android { class KeyLayoutMap; /* * A raw event as retrieved from the EventHub. */ struct RawEvent { nsecs_t when; int32_t deviceId; int32_t type; int32_t scanCode; int32_t keyCode; int32_t value; uint32_t flags; }; /* Describes an absolute axis. */ struct RawAbsoluteAxisInfo { bool valid; // true if the information is valid, false otherwise int32_t minValue; // minimum value int32_t maxValue; // maximum value int32_t flat; // center flat position, eg. flat == 8 means center is between -8 and 8 int32_t fuzz; // error tolerance, eg. fuzz == 4 means value is +/- 4 due to noise inline int32_t getRange() { return maxValue - minValue; } }; /* * Input device classes. */ enum { /* The input device is a keyboard. */ INPUT_DEVICE_CLASS_KEYBOARD = 0x00000001, /* The input device is an alpha-numeric keyboard (not just a dial pad). */ INPUT_DEVICE_CLASS_ALPHAKEY = 0x00000002, /* The input device is a touchscreen (either single-touch or multi-touch). */ INPUT_DEVICE_CLASS_TOUCHSCREEN = 0x00000004, /* The input device is a trackball. */ INPUT_DEVICE_CLASS_TRACKBALL = 0x00000008, /* The input device is a multi-touch touchscreen. */ INPUT_DEVICE_CLASS_TOUCHSCREEN_MT= 0x00000010, /* The input device is a directional pad. */ INPUT_DEVICE_CLASS_DPAD = 0x00000020, /* The input device is a gamepad (implies keyboard). */ INPUT_DEVICE_CLASS_GAMEPAD = 0x00000040, /* The input device has switches. */ INPUT_DEVICE_CLASS_SWITCH = 0x00000080, }; /* * Grand Central Station for events. * * The event hub aggregates input events received across all known input * devices on the system, including devices that may be emulated by the simulator * environment. In addition, the event hub generates fake input events to indicate * when devices are added or removed. * * The event hub provies a stream of input events (via the getEvent function). * It also supports querying the current actual state of input devices such as identifying * which keys are currently down. Finally, the event hub keeps track of the capabilities of * individual input devices, such as their class and the set of key codes that they support. */ class EventHubInterface : public virtual RefBase { protected: EventHubInterface() { } virtual ~EventHubInterface() { } public: // Synthetic raw event type codes produced when devices are added or removed. enum { DEVICE_ADDED = 0x10000000, DEVICE_REMOVED = 0x20000000 }; virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0; virtual String8 getDeviceName(int32_t deviceId) const = 0; virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis, RawAbsoluteAxisInfo* outAxisInfo) const = 0; virtual status_t scancodeToKeycode(int32_t deviceId, int scancode, int32_t* outKeycode, uint32_t* outFlags) const = 0; // exclude a particular device from opening // this can be used to ignore input devices for sensors virtual void addExcludedDevice(const char* deviceName) = 0; /* * Wait for the next event to become available and return it. * After returning, the EventHub holds onto a wake lock until the next call to getEvent. * This ensures that the device will not go to sleep while the event is being processed. * If the device needs to remain awake longer than that, then the caller is responsible * for taking care of it (say, by poking the power manager user activity timer). */ virtual bool getEvent(RawEvent* outEvent) = 0; /* * Query current input state. */ virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const = 0; virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const = 0; virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const = 0; /* * Examine key input devices for specific framework keycode support */ virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const = 0; }; class EventHub : public EventHubInterface { public: EventHub(); status_t errorCheck() const; virtual uint32_t getDeviceClasses(int32_t deviceId) const; virtual String8 getDeviceName(int32_t deviceId) const; virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis, RawAbsoluteAxisInfo* outAxisInfo) const; virtual status_t scancodeToKeycode(int32_t deviceId, int scancode, int32_t* outKeycode, uint32_t* outFlags) const; virtual void addExcludedDevice(const char* deviceName); virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const; virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const; virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const; virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const; virtual bool getEvent(RawEvent* outEvent); protected: virtual ~EventHub(); private: bool openPlatformInput(void); int open_device(const char *device); int close_device(const char *device); int scan_dir(const char *dirname); int read_notify(int nfd); status_t mError; struct device_t { const int32_t id; const String8 path; String8 name; uint32_t classes; uint8_t* keyBitmask; KeyLayoutMap* layoutMap; String8 keylayoutFilename; device_t* next; device_t(int32_t _id, const char* _path, const char* name); ~device_t(); }; device_t* getDevice(int32_t deviceId) const; bool hasKeycode(device_t* device, int keycode) const; int32_t getScanCodeStateLocked(device_t* device, int32_t scanCode) const; int32_t getKeyCodeStateLocked(device_t* device, int32_t keyCode) const; int32_t getSwitchStateLocked(device_t* device, int32_t sw) const; bool markSupportedKeyCodesLocked(device_t* device, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const; // Protect all internal state. mutable Mutex mLock; bool mHaveFirstKeyboard; int32_t mFirstKeyboardId; // the API is that the built-in keyboard is id 0, so map it struct device_ent { device_t* device; uint32_t seq; }; device_ent *mDevicesById; int mNumDevicesById; device_t *mOpeningDevices; device_t *mClosingDevices; device_t **mDevices; struct pollfd *mFDs; int mFDCount; bool mOpened; List mExcludedDevices; // device ids that report particular switches. #ifdef EV_SW int32_t mSwitches[SW_MAX + 1]; #endif static const int INPUT_BUFFER_SIZE = 64; struct input_event mInputBufferData[INPUT_BUFFER_SIZE]; int32_t mInputBufferIndex; int32_t mInputBufferCount; int32_t mInputDeviceIndex; }; }; // namespace android #endif // _RUNTIME_EVENT_HUB_H