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