EventHub.h revision cb1404e45639d20439d7700b06d57ca1a1aad1fa
1/* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17// 18#ifndef _RUNTIME_EVENT_HUB_H 19#define _RUNTIME_EVENT_HUB_H 20 21#include <ui/Input.h> 22#include <ui/Keyboard.h> 23#include <ui/KeyLayoutMap.h> 24#include <ui/KeyCharacterMap.h> 25#include <ui/VirtualKeyMap.h> 26#include <utils/String8.h> 27#include <utils/threads.h> 28#include <utils/Log.h> 29#include <utils/threads.h> 30#include <utils/List.h> 31#include <utils/Errors.h> 32#include <utils/PropertyMap.h> 33#include <utils/Vector.h> 34 35#include <linux/input.h> 36 37/* These constants are not defined in linux/input.h but they are part of the multitouch 38 * input protocol. */ 39 40#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */ 41#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */ 42#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */ 43#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */ 44#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */ 45#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */ 46#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */ 47#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device (finger, pen, ...) */ 48#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */ 49#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */ 50#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */ 51 52#define MT_TOOL_FINGER 0 /* Identifies a finger */ 53#define MT_TOOL_PEN 1 /* Identifies a pen */ 54 55#define SYN_MT_REPORT 2 56 57/* Convenience constants. */ 58 59#define BTN_FIRST 0x100 // first button scancode 60#define BTN_LAST 0x15f // last button scancode 61 62struct pollfd; 63 64namespace android { 65 66/* 67 * A raw event as retrieved from the EventHub. 68 */ 69struct RawEvent { 70 nsecs_t when; 71 int32_t deviceId; 72 int32_t type; 73 int32_t scanCode; 74 int32_t keyCode; 75 int32_t value; 76 uint32_t flags; 77}; 78 79/* Describes an absolute axis. */ 80struct RawAbsoluteAxisInfo { 81 bool valid; // true if the information is valid, false otherwise 82 83 int32_t minValue; // minimum value 84 int32_t maxValue; // maximum value 85 int32_t flat; // center flat position, eg. flat == 8 means center is between -8 and 8 86 int32_t fuzz; // error tolerance, eg. fuzz == 4 means value is +/- 4 due to noise 87 88 inline int32_t getRange() const { return maxValue - minValue; } 89 90 inline void clear() { 91 valid = false; 92 minValue = 0; 93 maxValue = 0; 94 flat = 0; 95 fuzz = 0; 96 } 97}; 98 99/* 100 * Input device classes. 101 */ 102enum { 103 /* The input device is a keyboard or has buttons. */ 104 INPUT_DEVICE_CLASS_KEYBOARD = 0x00000001, 105 106 /* The input device is an alpha-numeric keyboard (not just a dial pad). */ 107 INPUT_DEVICE_CLASS_ALPHAKEY = 0x00000002, 108 109 /* The input device is a touchscreen (either single-touch or multi-touch). */ 110 INPUT_DEVICE_CLASS_TOUCHSCREEN = 0x00000004, 111 112 /* The input device is a cursor device such as a trackball or mouse. */ 113 INPUT_DEVICE_CLASS_CURSOR = 0x00000008, 114 115 /* The input device is a multi-touch touchscreen. */ 116 INPUT_DEVICE_CLASS_TOUCHSCREEN_MT= 0x00000010, 117 118 /* The input device is a directional pad (implies keyboard, has DPAD keys). */ 119 INPUT_DEVICE_CLASS_DPAD = 0x00000020, 120 121 /* The input device is a gamepad (implies keyboard, has BUTTON keys). */ 122 INPUT_DEVICE_CLASS_GAMEPAD = 0x00000040, 123 124 /* The input device has switches. */ 125 INPUT_DEVICE_CLASS_SWITCH = 0x00000080, 126 127 /* The input device is a joystick (implies gamepad, has joystick absolute axes). */ 128 INPUT_DEVICE_CLASS_JOYSTICK = 0x00000100, 129}; 130 131/* 132 * Grand Central Station for events. 133 * 134 * The event hub aggregates input events received across all known input 135 * devices on the system, including devices that may be emulated by the simulator 136 * environment. In addition, the event hub generates fake input events to indicate 137 * when devices are added or removed. 138 * 139 * The event hub provides a stream of input events (via the getEvent function). 140 * It also supports querying the current actual state of input devices such as identifying 141 * which keys are currently down. Finally, the event hub keeps track of the capabilities of 142 * individual input devices, such as their class and the set of key codes that they support. 143 */ 144class EventHubInterface : public virtual RefBase { 145protected: 146 EventHubInterface() { } 147 virtual ~EventHubInterface() { } 148 149public: 150 // Synthetic raw event type codes produced when devices are added or removed. 151 enum { 152 // Sent when a device is added. 153 DEVICE_ADDED = 0x10000000, 154 // Sent when a device is removed. 155 DEVICE_REMOVED = 0x20000000, 156 // Sent when all added/removed devices from the most recent scan have been reported. 157 // This event is always sent at least once. 158 FINISHED_DEVICE_SCAN = 0x30000000, 159 }; 160 161 virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0; 162 163 virtual String8 getDeviceName(int32_t deviceId) const = 0; 164 165 virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const = 0; 166 167 virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis, 168 RawAbsoluteAxisInfo* outAxisInfo) const = 0; 169 170 virtual status_t scancodeToKeycode(int32_t deviceId, int scancode, 171 int32_t* outKeycode, uint32_t* outFlags) const = 0; 172 173 // exclude a particular device from opening 174 // this can be used to ignore input devices for sensors 175 virtual void addExcludedDevice(const char* deviceName) = 0; 176 177 /* 178 * Wait for the next event to become available and return it. 179 * After returning, the EventHub holds onto a wake lock until the next call to getEvent. 180 * This ensures that the device will not go to sleep while the event is being processed. 181 * If the device needs to remain awake longer than that, then the caller is responsible 182 * for taking care of it (say, by poking the power manager user activity timer). 183 */ 184 virtual bool getEvent(RawEvent* outEvent) = 0; 185 186 /* 187 * Query current input state. 188 */ 189 virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const = 0; 190 virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const = 0; 191 virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const = 0; 192 193 /* 194 * Examine key input devices for specific framework keycode support 195 */ 196 virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes, 197 uint8_t* outFlags) const = 0; 198 199 virtual bool hasLed(int32_t deviceId, int32_t led) const = 0; 200 virtual void setLedState(int32_t deviceId, int32_t led, bool on) = 0; 201 202 virtual void getVirtualKeyDefinitions(int32_t deviceId, 203 Vector<VirtualKeyDefinition>& outVirtualKeys) const = 0; 204 205 virtual void dump(String8& dump) = 0; 206}; 207 208class EventHub : public EventHubInterface 209{ 210public: 211 EventHub(); 212 213 status_t errorCheck() const; 214 215 virtual uint32_t getDeviceClasses(int32_t deviceId) const; 216 217 virtual String8 getDeviceName(int32_t deviceId) const; 218 219 virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const; 220 221 virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis, 222 RawAbsoluteAxisInfo* outAxisInfo) const; 223 224 virtual status_t scancodeToKeycode(int32_t deviceId, int scancode, 225 int32_t* outKeycode, uint32_t* outFlags) const; 226 227 virtual void addExcludedDevice(const char* deviceName); 228 229 virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const; 230 virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const; 231 virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const; 232 233 virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, 234 const int32_t* keyCodes, uint8_t* outFlags) const; 235 236 virtual bool getEvent(RawEvent* outEvent); 237 238 virtual bool hasLed(int32_t deviceId, int32_t led) const; 239 virtual void setLedState(int32_t deviceId, int32_t led, bool on); 240 241 virtual void getVirtualKeyDefinitions(int32_t deviceId, 242 Vector<VirtualKeyDefinition>& outVirtualKeys) const; 243 244 virtual void dump(String8& dump); 245 246protected: 247 virtual ~EventHub(); 248 249private: 250 bool openPlatformInput(void); 251 252 int openDevice(const char *devicePath); 253 int closeDevice(const char *devicePath); 254 int scanDir(const char *dirname); 255 int readNotify(int nfd); 256 257 status_t mError; 258 259 struct Device { 260 Device* next; 261 262 int fd; 263 const int32_t id; 264 const String8 path; 265 const InputDeviceIdentifier identifier; 266 267 uint32_t classes; 268 uint8_t* keyBitmask; 269 String8 configurationFile; 270 PropertyMap* configuration; 271 VirtualKeyMap* virtualKeyMap; 272 KeyMap keyMap; 273 274 Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier); 275 ~Device(); 276 277 void close(); 278 }; 279 280 Device* getDeviceLocked(int32_t deviceId) const; 281 bool hasKeycodeLocked(Device* device, int keycode) const; 282 283 int32_t getScanCodeStateLocked(Device* device, int32_t scanCode) const; 284 int32_t getKeyCodeStateLocked(Device* device, int32_t keyCode) const; 285 int32_t getSwitchStateLocked(Device* device, int32_t sw) const; 286 bool markSupportedKeyCodesLocked(Device* device, size_t numCodes, 287 const int32_t* keyCodes, uint8_t* outFlags) const; 288 289 void loadConfiguration(Device* device); 290 status_t loadVirtualKeyMap(Device* device); 291 status_t loadKeyMap(Device* device); 292 void setKeyboardProperties(Device* device, bool builtInKeyboard); 293 void clearKeyboardProperties(Device* device, bool builtInKeyboard); 294 295 // Protect all internal state. 296 mutable Mutex mLock; 297 298 // The actual id of the built-in keyboard, or -1 if none. 299 // EventHub remaps the built-in keyboard to id 0 externally as required by the API. 300 int32_t mBuiltInKeyboardId; 301 302 int32_t mNextDeviceId; 303 304 // Parallel arrays of fds and devices. 305 // First index is reserved for inotify. 306 Vector<struct pollfd> mFds; 307 Vector<Device*> mDevices; 308 309 Device *mOpeningDevices; 310 Device *mClosingDevices; 311 312 bool mOpened; 313 bool mNeedToSendFinishedDeviceScan; 314 List<String8> mExcludedDevices; 315 316 // device ids that report particular switches. 317#ifdef EV_SW 318 int32_t mSwitches[SW_MAX + 1]; 319#endif 320 321 static const int INPUT_BUFFER_SIZE = 64; 322 struct input_event mInputBufferData[INPUT_BUFFER_SIZE]; 323 size_t mInputBufferIndex; 324 size_t mInputBufferCount; 325 size_t mInputFdIndex; 326}; 327 328}; // namespace android 329 330#endif // _RUNTIME_EVENT_HUB_H 331