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Diffstat (limited to 'services/input/EventHub.h')
| -rw-r--r-- | services/input/EventHub.h | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/services/input/EventHub.h b/services/input/EventHub.h new file mode 100644 index 0000000..74b7ec5 --- /dev/null +++ b/services/input/EventHub.h @@ -0,0 +1,327 @@ +/* + * 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 <ui/Input.h> +#include <ui/Keyboard.h> +#include <ui/KeyLayoutMap.h> +#include <ui/KeyCharacterMap.h> +#include <ui/VirtualKeyMap.h> +#include <utils/String8.h> +#include <utils/threads.h> +#include <utils/Log.h> +#include <utils/threads.h> +#include <utils/List.h> +#include <utils/Errors.h> +#include <utils/PropertyMap.h> +#include <utils/Vector.h> + +#include <linux/input.h> + +/* 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 { + +/* + * 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; } + + inline void clear() { + valid = false; + minValue = 0; + maxValue = 0; + flat = 0; + fuzz = 0; + } +}; + +/* + * 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 cursor device such as a trackball or mouse. */ + INPUT_DEVICE_CLASS_CURSOR = 0x00000008, + + /* The input device is a multi-touch touchscreen. */ + INPUT_DEVICE_CLASS_TOUCHSCREEN_MT= 0x00000010, + + /* The input device is a directional pad (implies keyboard, has DPAD keys). */ + INPUT_DEVICE_CLASS_DPAD = 0x00000020, + + /* The input device is a gamepad (implies keyboard, has BUTTON keys). */ + 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 provides 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 { + // Sent when a device is added. + DEVICE_ADDED = 0x10000000, + // Sent when a device is removed. + DEVICE_REMOVED = 0x20000000, + // Sent when all added/removed devices from the most recent scan have been reported. + // This event is always sent at least once. + FINISHED_DEVICE_SCAN = 0x30000000, + }; + + virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0; + + virtual String8 getDeviceName(int32_t deviceId) const = 0; + + virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) 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; + + virtual bool hasLed(int32_t deviceId, int32_t led) const = 0; + virtual void setLedState(int32_t deviceId, int32_t led, bool on) = 0; + + virtual void getVirtualKeyDefinitions(int32_t deviceId, + Vector<VirtualKeyDefinition>& outVirtualKeys) const = 0; + + virtual void dump(String8& dump) = 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 void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) 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); + + virtual bool hasLed(int32_t deviceId, int32_t led) const; + virtual void setLedState(int32_t deviceId, int32_t led, bool on); + + virtual void getVirtualKeyDefinitions(int32_t deviceId, + Vector<VirtualKeyDefinition>& outVirtualKeys) const; + + virtual void dump(String8& dump); + +protected: + virtual ~EventHub(); + +private: + bool openPlatformInput(void); + + int openDevice(const char *devicePath); + int closeDevice(const char *devicePath); + int scanDir(const char *dirname); + int readNotify(int nfd); + + status_t mError; + + struct Device { + Device* next; + + int fd; + const int32_t id; + const String8 path; + const InputDeviceIdentifier identifier; + + uint32_t classes; + uint8_t* keyBitmask; + String8 configurationFile; + PropertyMap* configuration; + VirtualKeyMap* virtualKeyMap; + KeyMap keyMap; + + Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier); + ~Device(); + + void close(); + }; + + Device* getDeviceLocked(int32_t deviceId) const; + bool hasKeycodeLocked(Device* device, int keycode) const; + + int32_t getScanCodeStateLocked(Device* device, int32_t scanCode) const; + int32_t getKeyCodeStateLocked(Device* device, int32_t keyCode) const; + int32_t getSwitchStateLocked(Device* device, int32_t sw) const; + bool markSupportedKeyCodesLocked(Device* device, size_t numCodes, + const int32_t* keyCodes, uint8_t* outFlags) const; + + void loadConfiguration(Device* device); + status_t loadVirtualKeyMap(Device* device); + status_t loadKeyMap(Device* device); + void setKeyboardProperties(Device* device, bool builtInKeyboard); + void clearKeyboardProperties(Device* device, bool builtInKeyboard); + + // Protect all internal state. + mutable Mutex mLock; + + // The actual id of the built-in keyboard, or -1 if none. + // EventHub remaps the built-in keyboard to id 0 externally as required by the API. + int32_t mBuiltInKeyboardId; + + int32_t mNextDeviceId; + + // Parallel arrays of fds and devices. + // First index is reserved for inotify. + Vector<struct pollfd> mFds; + Vector<Device*> mDevices; + + Device *mOpeningDevices; + Device *mClosingDevices; + + bool mOpened; + bool mNeedToSendFinishedDeviceScan; + List<String8> 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]; + size_t mInputBufferIndex; + size_t mInputBufferCount; + size_t mInputFdIndex; +}; + +}; // namespace android + +#endif // _RUNTIME_EVENT_HUB_H |