text: #ifndef _INPUT_H
  #define _INPUT_H
  
  /*
   * Copyright (c) 1999-2002 Vojtech Pavlik
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   */
  
  #ifdef __KERNEL__
  #include <linux/time.h>
  #include <linux/list.h>
  #else
  #include <sys/time.h>
  #include <sys/ioctl.h>
  #include <sys/types.h>
  #include <linux/types.h>
  #endif
  
  /*
   * The event structure itself
   */
  
  struct input_event {
  	struct timeval time;
  	__u16 type;
  	__u16 code;
  	__s32 value;
  };
  
  /*
   * Protocol version.
   */
  
  #define EV_VERSION		0x010001
  
  /*
   * IOCTLs (0x00 - 0x7f)
   */
  
  struct input_id {
  	__u16 bustype;
  	__u16 vendor;
  	__u16 product;
  	__u16 version;
  };
  
  /**
   * struct input_absinfo - used by EVIOCGABS/EVIOCSABS ioctls
   * @value: latest reported value for the axis.
   * @minimum: specifies minimum value for the axis.
   * @maximum: specifies maximum value for the axis.
   * @fuzz: specifies fuzz value that is used to filter noise from
   *	the event stream.
   * @flat: values that are within this value will be discarded by
   *	joydev interface and reported as 0 instead.
   * @resolution: specifies resolution for the values reported for
   *	the axis.
   *
   * Note that input core does not clamp reported values to the
   * [minimum, maximum] limits, such task is left to userspace.
   *
   * Resolution for main axes (ABS_X, ABS_Y, ABS_Z) is reported in
   * units per millimeter (units/mm), resolution for rotational axes
   * (ABS_RX, ABS_RY, ABS_RZ) is reported in units per radian.
   */
  struct input_absinfo {
  	__s32 value;
  	__s32 minimum;
  	__s32 maximum;
  	__s32 fuzz;
  	__s32 flat;
  	__s32 resolution;
  };
  
  /**
   * struct input_keymap_entry - used by EVIOCGKEYCODE/EVIOCSKEYCODE ioctls
   * @scancode: scancode represented in machine-endian form.
   * @len: length of the scancode that resides in @scancode buffer.
   * @index: index in the keymap, may be used instead of scancode
   * @flags: allows to specify how kernel should handle the request. For
   *	example, setting INPUT_KEYMAP_BY_INDEX flag indicates that kernel
   *	should perform lookup in keymap by @index instead of @scancode
   * @keycode: key code assigned to this scancode
   *
   * The structure is used to retrieve and modify keymap data. Users have
   * option of performing lookup either by @scancode itself or by @index
   * in keymap entry. EVIOCGKEYCODE will also return scancode or index
   * (depending on which element was used to perform lookup).
   */
  struct input_keymap_entry {
  #define INPUT_KEYMAP_BY_INDEX	(1 << 0)
  	__u8  flags;
  	__u8  len;
  	__u16 index;
  	__u32 keycode;
  	__u8  scancode[32];
  };
  
  #define EVIOCGVERSION		_IOR('E', 0x01, int)			/* get driver version */
  #define EVIOCGID		_IOR('E', 0x02, struct input_id)	/* get device ID */
  #define EVIOCGREP		_IOR('E', 0x03, unsigned int[2])	/* get repeat settings */
  #define EVIOCSREP		_IOW('E', 0x03, unsigned int[2])	/* set repeat settings */
  
  #define EVIOCGKEYCODE		_IOR('E', 0x04, unsigned int[2])        /* get keycode */
  #define EVIOCGKEYCODE_V2	_IOR('E', 0x04, struct input_keymap_entry)
  #define EVIOCSKEYCODE		_IOW('E', 0x04, unsigned int[2])        /* set keycode */
  #define EVIOCSKEYCODE_V2	_IOW('E', 0x04, struct input_keymap_entry)
  
  #define EVIOCGNAME(len)		_IOC(_IOC_READ, 'E', 0x06, len)		/* get device name */
  #define EVIOCGPHYS(len)		_IOC(_IOC_READ, 'E', 0x07, len)		/* get physical location */
  #define EVIOCGUNIQ(len)		_IOC(_IOC_READ, 'E', 0x08, len)		/* get unique identifier */
  #define EVIOCGPROP(len)		_IOC(_IOC_READ, 'E', 0x09, len)		/* get device properties */
  
  /**
   * EVIOCGMTSLOTS(len) - get MT slot values
   *
   * The ioctl buffer argument should be binary equivalent to
   *
   * struct input_mt_request_layout {
   *	__u32 code;
   *	__s32 values[num_slots];
   * };
   *
   * where num_slots is the (arbitrary) number of MT slots to extract.
   *
   * The ioctl size argument (len) is the size of the buffer, which
   * should satisfy len = (num_slots + 1) * sizeof(__s32).  If len is
   * too small to fit all available slots, the first num_slots are
   * returned.
   *
   * Before the call, code is set to the wanted ABS_MT event type. On
   * return, values[] is filled with the slot values for the specified
   * ABS_MT code.
   *
   * If the request code is not an ABS_MT value, -EINVAL is returned.
   */
  #define EVIOCGMTSLOTS(len)	_IOC(_IOC_READ, 'E', 0x0a, len)
  
  #define EVIOCGKEY(len)		_IOC(_IOC_READ, 'E', 0x18, len)		/* get global key state */
  #define EVIOCGLED(len)		_IOC(_IOC_READ, 'E', 0x19, len)		/* get all LEDs */
  #define EVIOCGSND(len)		_IOC(_IOC_READ, 'E', 0x1a, len)		/* get all sounds status */
  #define EVIOCGSW(len)		_IOC(_IOC_READ, 'E', 0x1b, len)		/* get all switch states */
  
  #define EVIOCGBIT(ev,len)	_IOC(_IOC_READ, 'E', 0x20 + (ev), len)	/* get event bits */
  #define EVIOCGABS(abs)		_IOR('E', 0x40 + (abs), struct input_absinfo)	/* get abs value/limits */
  #define EVIOCSABS(abs)		_IOW('E', 0xc0 + (abs), struct input_absinfo)	/* set abs value/limits */
  
  #define EVIOCSFF		_IOC(_IOC_WRITE, 'E', 0x80, sizeof(struct ff_effect))	/* send a force effect to a force feedback device */
  #define EVIOCRMFF		_IOW('E', 0x81, int)			/* Erase a force effect */
  #define EVIOCGEFFECTS		_IOR('E', 0x84, int)			/* Report number of effects playable at the same time */
  
  #define EVIOCGRAB		_IOW('E', 0x90, int)			/* Grab/Release device */
  
  #define EVIOCSCLOCKID		_IOW('E', 0xa0, int)			/* Set clockid to be used for timestamps */
  
  /*
   * Device properties and quirks
   */
  
  #define INPUT_PROP_POINTER		0x00	/* needs a pointer */
  #define INPUT_PROP_DIRECT		0x01	/* direct input devices */
  #define INPUT_PROP_BUTTONPAD		0x02	/* has button(s) under pad */
  #define INPUT_PROP_SEMI_MT		0x03	/* touch rectangle only */
  
  #define INPUT_PROP_MAX			0x1f
  #define INPUT_PROP_CNT			(INPUT_PROP_MAX + 1)
  
  /*
   * Event types
   */
  
  #define EV_SYN			0x00
  #define EV_KEY			0x01
  #define EV_REL			0x02
  #define EV_ABS			0x03
  #define EV_MSC			0x04
  #define EV_SW			0x05
  #define EV_LED			0x11
  #define EV_SND			0x12
  #define EV_REP			0x14
  #define EV_FF			0x15
  #define EV_PWR			0x16
  #define EV_FF_STATUS		0x17
  #define EV_MAX			0x1f
  #define EV_CNT			(EV_MAX+1)
  
  /*
   * Synchronization events.
   */
  
  #define SYN_REPORT		0
  #define SYN_CONFIG		1
  #define SYN_MT_REPORT		2
  #define SYN_DROPPED		3
  
  /*
   * Keys and buttons
   *
   * Most of the keys/buttons are modeled after USB HUT 1.12
   * (see http://www.usb.org/developers/hidpage).
   * Abbreviations in the comments:
   * AC - Application Control
   * AL - Application Launch Button
   * SC - System Control
   */
  
  #define KEY_RESERVED		0
  #define KEY_ESC			1
  #define KEY_1			2
  #define KEY_2			3
  #define KEY_3			4
  #define KEY_4			5
  #define KEY_5			6
  #define KEY_6			7
  #define KEY_7			8
  #define KEY_8			9
  #define KEY_9			10
  #define KEY_0			11
  #define KEY_MINUS		12
  #define KEY_EQUAL		13
  #define KEY_BACKSPACE		14
  #define KEY_TAB			15
  #define KEY_Q			16
  #define KEY_W			17
  #define KEY_E			18
  #define KEY_R			19
  #define KEY_T			20
  #define KEY_Y			21
  #define KEY_U			22
  #define KEY_I			23
  #define KEY_O			24
  #define KEY_P			25
  #define KEY_LEFTBRACE		26
  #define KEY_RIGHTBRACE		27
  #define KEY_ENTER		28
  #define KEY_LEFTCTRL		29
  #define KEY_A			30
  #define KEY_S			31
  #define KEY_D			32
  #define KEY_F			33
  #define KEY_G			34
  #define KEY_H			35
  #define KEY_J			36
  #define KEY_K			37
  #define KEY_L			38
  #define KEY_SEMICOLON		39
  #define KEY_APOSTROPHE		40
  #define KEY_GRAVE		41
  #define KEY_LEFTSHIFT		42
  #define KEY_BACKSLASH		43
  #define KEY_Z			44
  #define KEY_X			45
  #define KEY_C			46
  #define KEY_V			47
  #define KEY_B			48
  #define KEY_N			49
  #define KEY_M			50
  #define KEY_COMMA		51
  #define KEY_DOT			52
  #define KEY_SLASH		53
  #define KEY_RIGHTSHIFT		54
  #define KEY_KPASTERISK		55
  #define KEY_LEFTALT		56
  #define KEY_SPACE		57
  #define KEY_CAPSLOCK		58
  #define KEY_F1			59
  #define KEY_F2			60
  #define KEY_F3			61
  #define KEY_F4			62
  #define KEY_F5			63
  #define KEY_F6			64
  #define KEY_F7			65
  #define KEY_F8			66
  #define KEY_F9			67
  #define KEY_F10			68
  #define KEY_NUMLOCK		69
  #define KEY_SCROLLLOCK		70
  #define KEY_KP7			71
  #define KEY_KP8			72
  #define KEY_KP9			73
  #define KEY_KPMINUS		74
  #define KEY_KP4			75
  #define KEY_KP5			76
  #define KEY_KP6			77
  #define KEY_KPPLUS		78
  #define KEY_KP1			79
  #define KEY_KP2			80
  #define KEY_KP3			81
  #define KEY_KP0			82
  #define KEY_KPDOT		83
  
  #define KEY_ZENKAKUHANKAKU	85
  #define KEY_102ND		86
  #define KEY_F11			87
  #define KEY_F12			88
  #define KEY_RO			89
  #define KEY_KATAKANA		90
  #define KEY_HIRAGANA		91
  #define KEY_HENKAN		92
  #define KEY_KATAKANAHIRAGANA	93
  #define KEY_MUHENKAN		94
  #define KEY_KPJPCOMMA		95
  #define KEY_KPENTER		96
  #define KEY_RIGHTCTRL		97
  #define KEY_KPSLASH		98
  #define KEY_SYSRQ		99
  #define KEY_RIGHTALT		100
  #define KEY_LINEFEED		101
  #define KEY_HOME		102
  #define KEY_UP			103
  #define KEY_PAGEUP		104
  #define KEY_LEFT		105
  #define KEY_RIGHT		106
  #define KEY_END			107
  #define KEY_DOWN		108
  #define KEY_PAGEDOWN		109
  #define KEY_INSERT		110
  #define KEY_DELETE		111
  #define KEY_MACRO		112
  #define KEY_MUTE		113
  #define KEY_VOLUMEDOWN		114
  #define KEY_VOLUMEUP		115
  #define KEY_POWER		116	/* SC System Power Down */
  #define KEY_KPEQUAL		117
  #define KEY_KPPLUSMINUS		118
  #define KEY_PAUSE		119
  #define KEY_SCALE		120	/* AL Compiz Scale (Expose) */
  
  #define KEY_KPCOMMA		121
  #define KEY_HANGEUL		122
  #define KEY_HANGUEL		KEY_HANGEUL
  #define KEY_HANJA		123
  #define KEY_YEN			124
  #define KEY_LEFTMETA		125
  #define KEY_RIGHTMETA		126
  #define KEY_COMPOSE		127
  
  #define KEY_STOP		128	/* AC Stop */
  #define KEY_AGAIN		129
  #define KEY_PROPS		130	/* AC Properties */
  #define KEY_UNDO		131	/* AC Undo */
  #define KEY_FRONT		132
  #define KEY_COPY		133	/* AC Copy */
  #define KEY_OPEN		134	/* AC Open */
  #define KEY_PASTE		135	/* AC Paste */
  #define KEY_FIND		136	/* AC Search */
  #define KEY_CUT			137	/* AC Cut */
  #define KEY_HELP		138	/* AL Integrated Help Center */
  #define KEY_MENU		139	/* Menu (show menu) */
  #define KEY_CALC		140	/* AL Calculator */
  #define KEY_SETUP		141
  #define KEY_SLEEP		142	/* SC System Sleep */
  #define KEY_WAKEUP		143	/* System Wake Up */
  #define KEY_FILE		144	/* AL Local Machine Browser */
  #define KEY_SENDFILE		145
  #define KEY_DELETEFILE		146
  #define KEY_XFER		147
  #define KEY_PROG1		148
  #define KEY_PROG2		149
  #define KEY_WWW			150	/* AL Internet Browser */
  #define KEY_MSDOS		151
  #define KEY_COFFEE		152	/* AL Terminal Lock/Screensaver */
  #define KEY_SCREENLOCK		KEY_COFFEE
  #define KEY_DIRECTION		153
  #define KEY_CYCLEWINDOWS	154
  #define KEY_MAIL		155
  #define KEY_BOOKMARKS		156	/* AC Bookmarks */
  #define KEY_COMPUTER		157
  #define KEY_BACK		158	/* AC Back */
  #define KEY_FORWARD		159	/* AC Forward */
  #define KEY_CLOSECD		160
  #define KEY_EJECTCD		161
  #define KEY_EJECTCLOSECD	162
  #define KEY_NEXTSONG		163
  #define KEY_PLAYPAUSE		164
  #define KEY_PREVIOUSSONG	165
  #define KEY_STOPCD		166
  #define KEY_RECORD		167
  #define KEY_REWIND		168
  #define KEY_PHONE		169	/* Media Select Telephone */
  #define KEY_ISO			170
  #define KEY_CONFIG		171	/* AL Consumer Control Configuration */
  #define KEY_HOMEPAGE		172	/* AC Home */
  #define KEY_REFRESH		173	/* AC Refresh */
  #define KEY_EXIT		174	/* AC Exit */
  #define KEY_MOVE		175
  #define KEY_EDIT		176
  #define KEY_SCROLLUP		177
  #define KEY_SCROLLDOWN		178
  #define KEY_KPLEFTPAREN		179
  #define KEY_KPRIGHTPAREN	180
  #define KEY_NEW			181	/* AC New */
  #define KEY_REDO		182	/* AC Redo/Repeat */
  
  #define KEY_F13			183
  #define KEY_F14			184
  #define KEY_F15			185
  #define KEY_F16			186
  #define KEY_F17			187
  #define KEY_F18			188
  #define KEY_F19			189
  #define KEY_F20			190
  #define KEY_F21			191
  #define KEY_F22			192
  #define KEY_F23			193
  #define KEY_F24			194
  
  #define KEY_PLAYCD		200
  #define KEY_PAUSECD		201
  #define KEY_PROG3		202
  #define KEY_PROG4		203
  #define KEY_DASHBOARD		204	/* AL Dashboard */
  #define KEY_SUSPEND		205
  #define KEY_CLOSE		206	/* AC Close */
  #define KEY_PLAY		207
  #define KEY_FASTFORWARD		208
  #define KEY_BASSBOOST		209
  #define KEY_PRINT		210	/* AC Print */
  #define KEY_HP			211
  #define KEY_CAMERA		212
  #define KEY_SOUND		213
  #define KEY_QUESTION		214
  #define KEY_EMAIL		215
  #define KEY_CHAT		216
  #define KEY_SEARCH		217
  #define KEY_CONNECT		218
  #define KEY_FINANCE		219	/* AL Checkbook/Finance */
  #define KEY_SPORT		220
  #define KEY_SHOP		221
  #define KEY_ALTERASE		222
  #define KEY_CANCEL		223	/* AC Cancel */
  #define KEY_BRIGHTNESSDOWN	224
  #define KEY_BRIGHTNESSUP	225
  #define KEY_MEDIA		226
  
  #define KEY_SWITCHVIDEOMODE	227	/* Cycle between available video
  					   outputs (Monitor/LCD/TV-out/etc) */
  #define KEY_KBDILLUMTOGGLE	228
  #define KEY_KBDILLUMDOWN	229
  #define KEY_KBDILLUMUP		230
  
  #define KEY_SEND		231	/* AC Send */
  #define KEY_REPLY		232	/* AC Reply */
  #define KEY_FORWARDMAIL		233	/* AC Forward Msg */
  #define KEY_SAVE		234	/* AC Save */
  #define KEY_DOCUMENTS		235
  
  #define KEY_BATTERY		236
  
  #define KEY_BLUETOOTH		237
  #define KEY_WLAN		238
  #define KEY_UWB			239
  
  #define KEY_UNKNOWN		240
  
  #define KEY_VIDEO_NEXT		241	/* drive next video source */
  #define KEY_VIDEO_PREV		242	/* drive previous video source */
  #define KEY_BRIGHTNESS_CYCLE	243	/* brightness up, after max is min */
  #define KEY_BRIGHTNESS_ZERO	244	/* brightness off, use ambient */
  #define KEY_DISPLAY_OFF		245	/* display device to off state */
  
  #define KEY_WIMAX		246
  #define KEY_RFKILL		247	/* Key that controls all radios */
  
  #define KEY_MICMUTE		248	/* Mute / unmute the microphone */
  
  /* Code 255 is reserved for special needs of AT keyboard driver */
  
  #define BTN_MISC		0x100
  #define BTN_0			0x100
  #define BTN_1			0x101
  #define BTN_2			0x102
  #define BTN_3			0x103
  #define BTN_4			0x104
  #define BTN_5			0x105
  #define BTN_6			0x106
  #define BTN_7			0x107
  #define BTN_8			0x108
  #define BTN_9			0x109
  
  #define BTN_MOUSE		0x110
  #define BTN_LEFT		0x110
  #define BTN_RIGHT		0x111
  #define BTN_MIDDLE		0x112
  #define BTN_SIDE		0x113
  #define BTN_EXTRA		0x114
  #define BTN_FORWARD		0x115
  #define BTN_BACK		0x116
  #define BTN_TASK		0x117
  
  #define BTN_JOYSTICK		0x120
  #define BTN_TRIGGER		0x120
  #define BTN_THUMB		0x121
  #define BTN_THUMB2		0x122
  #define BTN_TOP			0x123
  #define BTN_TOP2		0x124
  #define BTN_PINKIE		0x125
  #define BTN_BASE		0x126
  #define BTN_BASE2		0x127
  #define BTN_BASE3		0x128
  #define BTN_BASE4		0x129
  #define BTN_BASE5		0x12a
  #define BTN_BASE6		0x12b
  #define BTN_DEAD		0x12f
  
  #define BTN_GAMEPAD		0x130
  #define BTN_A			0x130
  #define BTN_B			0x131
  #define BTN_C			0x132
  #define BTN_X			0x133
  #define BTN_Y			0x134
  #define BTN_Z			0x135
  #define BTN_TL			0x136
  #define BTN_TR			0x137
  #define BTN_TL2			0x138
  #define BTN_TR2			0x139
  #define BTN_SELECT		0x13a
  #define BTN_START		0x13b
  #define BTN_MODE		0x13c
  #define BTN_THUMBL		0x13d
  #define BTN_THUMBR		0x13e
  
  #define BTN_DIGI		0x140
  #define BTN_TOOL_PEN		0x140
  #define BTN_TOOL_RUBBER		0x141
  #define BTN_TOOL_BRUSH		0x142
  #define BTN_TOOL_PENCIL		0x143
  #define BTN_TOOL_AIRBRUSH	0x144
  #define BTN_TOOL_FINGER		0x145
  #define BTN_TOOL_MOUSE		0x146
  #define BTN_TOOL_LENS		0x147
  #define BTN_TOOL_QUINTTAP	0x148	/* Five fingers on trackpad */
  #define BTN_TOUCH		0x14a
  #define BTN_STYLUS		0x14b
  #define BTN_STYLUS2		0x14c
  #define BTN_TOOL_DOUBLETAP	0x14d
  #define BTN_TOOL_TRIPLETAP	0x14e
  #define BTN_TOOL_QUADTAP	0x14f	/* Four fingers on trackpad */
  
  #define BTN_WHEEL		0x150
  #define BTN_GEAR_DOWN		0x150
  #define BTN_GEAR_UP		0x151
  
  #define KEY_OK			0x160
  #define KEY_SELECT		0x161
  #define KEY_GOTO		0x162
  #define KEY_CLEAR		0x163
  #define KEY_POWER2		0x164
  #define KEY_OPTION		0x165
  #define KEY_INFO		0x166	/* AL OEM Features/Tips/Tutorial */
  #define KEY_TIME		0x167
  #define KEY_VENDOR		0x168
  #define KEY_ARCHIVE		0x169
  #define KEY_PROGRAM		0x16a	/* Media Select Program Guide */
  #define KEY_CHANNEL		0x16b
  #define KEY_FAVORITES		0x16c
  #define KEY_EPG			0x16d
  #define KEY_PVR			0x16e	/* Media Select Home */
  #define KEY_MHP			0x16f
  #define KEY_LANGUAGE		0x170
  #define KEY_TITLE		0x171
  #define KEY_SUBTITLE		0x172
  #define KEY_ANGLE		0x173
  #define KEY_ZOOM		0x174
  #define KEY_MODE		0x175
  #define KEY_KEYBOARD		0x176
  #define KEY_SCREEN		0x177
  #define KEY_PC			0x178	/* Media Select Computer */
  #define KEY_TV			0x179	/* Media Select TV */
  #define KEY_TV2			0x17a	/* Media Select Cable */
  #define KEY_VCR			0x17b	/* Media Select VCR */
  #define KEY_VCR2		0x17c	/* VCR Plus */
  #define KEY_SAT			0x17d	/* Media Select Satellite */
  #define KEY_SAT2		0x17e
  #define KEY_CD			0x17f	/* Media Select CD */
  #define KEY_TAPE		0x180	/* Media Select Tape */
  #define KEY_RADIO		0x181
  #define KEY_TUNER		0x182	/* Media Select Tuner */
  #define KEY_PLAYER		0x183
  #define KEY_TEXT		0x184
  #define KEY_DVD			0x185	/* Media Select DVD */
  #define KEY_AUX			0x186
  #define KEY_MP3			0x187
  #define KEY_AUDIO		0x188	/* AL Audio Browser */
  #define KEY_VIDEO		0x189	/* AL Movie Browser */
  #define KEY_DIRECTORY		0x18a
  #define KEY_LIST		0x18b
  #define KEY_MEMO		0x18c	/* Media Select Messages */
  #define KEY_CALENDAR		0x18d
  #define KEY_RED			0x18e
  #define KEY_GREEN		0x18f
  #define KEY_YELLOW		0x190
  #define KEY_BLUE		0x191
  #define KEY_CHANNELUP		0x192	/* Channel Increment */
  #define KEY_CHANNELDOWN		0x193	/* Channel Decrement */
  #define KEY_FIRST		0x194
  #define KEY_LAST		0x195	/* Recall Last */
  #define KEY_AB			0x196
  #define KEY_NEXT		0x197
  #define KEY_RESTART		0x198
  #define KEY_SLOW		0x199
  #define KEY_SHUFFLE		0x19a
  #define KEY_BREAK		0x19b
  #define KEY_PREVIOUS		0x19c
  #define KEY_DIGITS		0x19d
  #define KEY_TEEN		0x19e
  #define KEY_TWEN		0x19f
  #define KEY_VIDEOPHONE		0x1a0	/* Media Select Video Phone */
  #define KEY_GAMES		0x1a1	/* Media Select Games */
  #define KEY_ZOOMIN		0x1a2	/* AC Zoom In */
  #define KEY_ZOOMOUT		0x1a3	/* AC Zoom Out */
  #define KEY_ZOOMRESET		0x1a4	/* AC Zoom */
  #define KEY_WORDPROCESSOR	0x1a5	/* AL Word Processor */
  #define KEY_EDITOR		0x1a6	/* AL Text Editor */
  #define KEY_SPREADSHEET		0x1a7	/* AL Spreadsheet */
  #define KEY_GRAPHICSEDITOR	0x1a8	/* AL Graphics Editor */
  #define KEY_PRESENTATION	0x1a9	/* AL Presentation App */
  #define KEY_DATABASE		0x1aa	/* AL Database App */
  #define KEY_NEWS		0x1ab	/* AL Newsreader */
  #define KEY_VOICEMAIL		0x1ac	/* AL Voicemail */
  #define KEY_ADDRESSBOOK		0x1ad	/* AL Contacts/Address Book */
  #define KEY_MESSENGER		0x1ae	/* AL Instant Messaging */
  #define KEY_DISPLAYTOGGLE	0x1af	/* Turn display (LCD) on and off */
  #define KEY_SPELLCHECK		0x1b0   /* AL Spell Check */
  #define KEY_LOGOFF		0x1b1   /* AL Logoff */
  
  #define KEY_DOLLAR		0x1b2
  #define KEY_EURO		0x1b3
  
  #define KEY_FRAMEBACK		0x1b4	/* Consumer - transport controls */
  #define KEY_FRAMEFORWARD	0x1b5
  #define KEY_CONTEXT_MENU	0x1b6	/* GenDesc - system context menu */
  #define KEY_MEDIA_REPEAT	0x1b7	/* Consumer - transport control */
  #define KEY_10CHANNELSUP	0x1b8	/* 10 channels up (10+) */
  #define KEY_10CHANNELSDOWN	0x1b9	/* 10 channels down (10-) */
  #define KEY_IMAGES		0x1ba	/* AL Image Browser */
  
  #define KEY_DEL_EOL		0x1c0
  #define KEY_DEL_EOS		0x1c1
  #define KEY_INS_LINE		0x1c2
  #define KEY_DEL_LINE		0x1c3
  
  #define KEY_FN			0x1d0
  #define KEY_FN_ESC		0x1d1
  #define KEY_FN_F1		0x1d2
  #define KEY_FN_F2		0x1d3
  #define KEY_FN_F3		0x1d4
  #define KEY_FN_F4		0x1d5
  #define KEY_FN_F5		0x1d6
  #define KEY_FN_F6		0x1d7
  #define KEY_FN_F7		0x1d8
  #define KEY_FN_F8		0x1d9
  #define KEY_FN_F9		0x1da
  #define KEY_FN_F10		0x1db
  #define KEY_FN_F11		0x1dc
  #define KEY_FN_F12		0x1dd
  #define KEY_FN_1		0x1de
  #define KEY_FN_2		0x1df
  #define KEY_FN_D		0x1e0
  #define KEY_FN_E		0x1e1
  #define KEY_FN_F		0x1e2
  #define KEY_FN_S		0x1e3
  #define KEY_FN_B		0x1e4
  
  #define KEY_BRL_DOT1		0x1f1
  #define KEY_BRL_DOT2		0x1f2
  #define KEY_BRL_DOT3		0x1f3
  #define KEY_BRL_DOT4		0x1f4
  #define KEY_BRL_DOT5		0x1f5
  #define KEY_BRL_DOT6		0x1f6
  #define KEY_BRL_DOT7		0x1f7
  #define KEY_BRL_DOT8		0x1f8
  #define KEY_BRL_DOT9		0x1f9
  #define KEY_BRL_DOT10		0x1fa
  
  #define KEY_NUMERIC_0		0x200	/* used by phones, remote controls, */
  #define KEY_NUMERIC_1		0x201	/* and other keypads */
  #define KEY_NUMERIC_2		0x202
  #define KEY_NUMERIC_3		0x203
  #define KEY_NUMERIC_4		0x204
  #define KEY_NUMERIC_5		0x205
  #define KEY_NUMERIC_6		0x206
  #define KEY_NUMERIC_7		0x207
  #define KEY_NUMERIC_8		0x208
  #define KEY_NUMERIC_9		0x209
  #define KEY_NUMERIC_STAR	0x20a
  #define KEY_NUMERIC_POUND	0x20b
  
  #define KEY_CAMERA_FOCUS	0x210
  #define KEY_WPS_BUTTON		0x211	/* WiFi Protected Setup key */
  
  #define KEY_TOUCHPAD_TOGGLE	0x212	/* Request switch touchpad on or off */
  #define KEY_TOUCHPAD_ON		0x213
  #define KEY_TOUCHPAD_OFF	0x214
  
  #define KEY_CAMERA_ZOOMIN	0x215
  #define KEY_CAMERA_ZOOMOUT	0x216
  #define KEY_CAMERA_UP		0x217
  #define KEY_CAMERA_DOWN		0x218
  #define KEY_CAMERA_LEFT		0x219
  #define KEY_CAMERA_RIGHT	0x21a
  
  #define BTN_TRIGGER_HAPPY		0x2c0
  #define BTN_TRIGGER_HAPPY1		0x2c0
  #define BTN_TRIGGER_HAPPY2		0x2c1
  #define BTN_TRIGGER_HAPPY3		0x2c2
  #define BTN_TRIGGER_HAPPY4		0x2c3
  #define BTN_TRIGGER_HAPPY5		0x2c4
  #define BTN_TRIGGER_HAPPY6		0x2c5
  #define BTN_TRIGGER_HAPPY7		0x2c6
  #define BTN_TRIGGER_HAPPY8		0x2c7
  #define BTN_TRIGGER_HAPPY9		0x2c8
  #define BTN_TRIGGER_HAPPY10		0x2c9
  #define BTN_TRIGGER_HAPPY11		0x2ca
  #define BTN_TRIGGER_HAPPY12		0x2cb
  #define BTN_TRIGGER_HAPPY13		0x2cc
  #define BTN_TRIGGER_HAPPY14		0x2cd
  #define BTN_TRIGGER_HAPPY15		0x2ce
  #define BTN_TRIGGER_HAPPY16		0x2cf
  #define BTN_TRIGGER_HAPPY17		0x2d0
  #define BTN_TRIGGER_HAPPY18		0x2d1
  #define BTN_TRIGGER_HAPPY19		0x2d2
  #define BTN_TRIGGER_HAPPY20		0x2d3
  #define BTN_TRIGGER_HAPPY21		0x2d4
  #define BTN_TRIGGER_HAPPY22		0x2d5
  #define BTN_TRIGGER_HAPPY23		0x2d6
  #define BTN_TRIGGER_HAPPY24		0x2d7
  #define BTN_TRIGGER_HAPPY25		0x2d8
  #define BTN_TRIGGER_HAPPY26		0x2d9
  #define BTN_TRIGGER_HAPPY27		0x2da
  #define BTN_TRIGGER_HAPPY28		0x2db
  #define BTN_TRIGGER_HAPPY29		0x2dc
  #define BTN_TRIGGER_HAPPY30		0x2dd
  #define BTN_TRIGGER_HAPPY31		0x2de
  #define BTN_TRIGGER_HAPPY32		0x2df
  #define BTN_TRIGGER_HAPPY33		0x2e0
  #define BTN_TRIGGER_HAPPY34		0x2e1
  #define BTN_TRIGGER_HAPPY35		0x2e2
  #define BTN_TRIGGER_HAPPY36		0x2e3
  #define BTN_TRIGGER_HAPPY37		0x2e4
  #define BTN_TRIGGER_HAPPY38		0x2e5
  #define BTN_TRIGGER_HAPPY39		0x2e6
  #define BTN_TRIGGER_HAPPY40		0x2e7
  
  /* We avoid low common keys in module aliases so they don't get huge. */
  #define KEY_MIN_INTERESTING	KEY_MUTE
  #define KEY_MAX			0x2ff
  #define KEY_CNT			(KEY_MAX+1)
  
  /*
   * Relative axes
   */
  
  #define REL_X			0x00
  #define REL_Y			0x01
  #define REL_Z			0x02
  #define REL_RX			0x03
  #define REL_RY			0x04
  #define REL_RZ			0x05
  #define REL_HWHEEL		0x06
  #define REL_DIAL		0x07
  #define REL_WHEEL		0x08
  #define REL_MISC		0x09
  #define REL_MAX			0x0f
  #define REL_CNT			(REL_MAX+1)
  
  /*
   * Absolute axes
   */
  
  #define ABS_X			0x00
  #define ABS_Y			0x01
  #define ABS_Z			0x02
  #define ABS_RX			0x03
  #define ABS_RY			0x04
  #define ABS_RZ			0x05
  #define ABS_THROTTLE		0x06
  #define ABS_RUDDER		0x07
  #define ABS_WHEEL		0x08
  #define ABS_GAS			0x09
  #define ABS_BRAKE		0x0a
  #define ABS_HAT0X		0x10
  #define ABS_HAT0Y		0x11
  #define ABS_HAT1X		0x12
  #define ABS_HAT1Y		0x13
  #define ABS_HAT2X		0x14
  #define ABS_HAT2Y		0x15
  #define ABS_HAT3X		0x16
  #define ABS_HAT3Y		0x17
  #define ABS_PRESSURE		0x18
  #define ABS_DISTANCE		0x19
  #define ABS_TILT_X		0x1a
  #define ABS_TILT_Y		0x1b
  #define ABS_TOOL_WIDTH		0x1c
  
  #define ABS_VOLUME		0x20
  
  #define ABS_MISC		0x28
  
  #define ABS_MT_SLOT		0x2f	/* MT slot being modified */
  #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 */
  #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 ABS_MT_DISTANCE		0x3b	/* Contact hover distance */
  
  #ifdef __KERNEL__
  /* Implementation details, userspace should not care about these */
  #define ABS_MT_FIRST		ABS_MT_TOUCH_MAJOR
  #define ABS_MT_LAST		ABS_MT_DISTANCE
  #endif
  
  #define ABS_MAX			0x3f
  #define ABS_CNT			(ABS_MAX+1)
  
  /*
   * Switch events
   */
  
  #define SW_LID			0x00  /* set = lid shut */
  #define SW_TABLET_MODE		0x01  /* set = tablet mode */
  #define SW_HEADPHONE_INSERT	0x02  /* set = inserted */
  #define SW_RFKILL_ALL		0x03  /* rfkill master switch, type "any"
  					 set = radio enabled */
  #define SW_RADIO		SW_RFKILL_ALL	/* deprecated */
  #define SW_MICROPHONE_INSERT	0x04  /* set = inserted */
  #define SW_DOCK			0x05  /* set = plugged into dock */
  #define SW_LINEOUT_INSERT	0x06  /* set = inserted */
  #define SW_JACK_PHYSICAL_INSERT 0x07  /* set = mechanical switch set */
  #define SW_VIDEOOUT_INSERT	0x08  /* set = inserted */
  #define SW_CAMERA_LENS_COVER	0x09  /* set = lens covered */
  #define SW_KEYPAD_SLIDE		0x0a  /* set = keypad slide out */
  #define SW_FRONT_PROXIMITY	0x0b  /* set = front proximity sensor active */
  #define SW_ROTATE_LOCK		0x0c  /* set = rotate locked/disabled */
  #define SW_LINEIN_INSERT	0x0d  /* set = inserted */
  #define SW_MAX			0x0f
  #define SW_CNT			(SW_MAX+1)
  
  /*
   * Misc events
   */
  
  #define MSC_SERIAL		0x00
  #define MSC_PULSELED		0x01
  #define MSC_GESTURE		0x02
  #define MSC_RAW			0x03
  #define MSC_SCAN		0x04
  #define MSC_MAX			0x07
  #define MSC_CNT			(MSC_MAX+1)
  
  /*
   * LEDs
   */
  
  #define LED_NUML		0x00
  #define LED_CAPSL		0x01
  #define LED_SCROLLL		0x02
  #define LED_COMPOSE		0x03
  #define LED_KANA		0x04
  #define LED_SLEEP		0x05
  #define LED_SUSPEND		0x06
  #define LED_MUTE		0x07
  #define LED_MISC		0x08
  #define LED_MAIL		0x09
  #define LED_CHARGING		0x0a
  #define LED_MAX			0x0f
  #define LED_CNT			(LED_MAX+1)
  
  /*
   * Autorepeat values
   */
  
  #define REP_DELAY		0x00
  #define REP_PERIOD		0x01
  #define REP_MAX			0x01
  #define REP_CNT			(REP_MAX+1)
  
  /*
   * Sounds
   */
  
  #define SND_CLICK		0x00
  #define SND_BELL		0x01
  #define SND_TONE		0x02
  #define SND_MAX			0x07
  #define SND_CNT			(SND_MAX+1)
  
  /*
   * IDs.
   */
  
  #define ID_BUS			0
  #define ID_VENDOR		1
  #define ID_PRODUCT		2
  #define ID_VERSION		3
  
  #define BUS_PCI			0x01
  #define BUS_ISAPNP		0x02
  #define BUS_USB			0x03
  #define BUS_HIL			0x04
  #define BUS_BLUETOOTH		0x05
  #define BUS_VIRTUAL		0x06
  
  #define BUS_ISA			0x10
  #define BUS_I8042		0x11
  #define BUS_XTKBD		0x12
  #define BUS_RS232		0x13
  #define BUS_GAMEPORT		0x14
  #define BUS_PARPORT		0x15
  #define BUS_AMIGA		0x16
  #define BUS_ADB			0x17
  #define BUS_I2C			0x18
  #define BUS_HOST		0x19
  #define BUS_GSC			0x1A
  #define BUS_ATARI		0x1B
  #define BUS_SPI			0x1C
  
  /*
   * MT_TOOL types
   */
  #define MT_TOOL_FINGER		0
  #define MT_TOOL_PEN		1
  #define MT_TOOL_MAX		1
  
  /*
   * Values describing the status of a force-feedback effect
   */
  #define FF_STATUS_STOPPED	0x00
  #define FF_STATUS_PLAYING	0x01
  #define FF_STATUS_MAX		0x01
  
  /*
   * Structures used in ioctls to upload effects to a device
   * They are pieces of a bigger structure (called ff_effect)
   */
  
  /*
   * All duration values are expressed in ms. Values above 32767 ms (0x7fff)
   * should not be used and have unspecified results.
   */
  
  /**
   * struct ff_replay - defines scheduling of the force-feedback effect
   * @length: duration of the effect
   * @delay: delay before effect should start playing
   */
  struct ff_replay {
  	__u16 length;
  	__u16 delay;
  };
  
  /**
   * struct ff_trigger - defines what triggers the force-feedback effect
   * @button: number of the button triggering the effect
   * @interval: controls how soon the effect can be re-triggered
   */
  struct ff_trigger {
  	__u16 button;
  	__u16 interval;
  };
  
  /**
   * struct ff_envelope - generic force-feedback effect envelope
   * @attack_length: duration of the attack (ms)
   * @attack_level: level at the beginning of the attack
   * @fade_length: duration of fade (ms)
   * @fade_level: level at the end of fade
   *
   * The @attack_level and @fade_level are absolute values; when applying
   * envelope force-feedback core will convert to positive/negative
   * value based on polarity of the default level of the effect.
   * Valid range for the attack and fade levels is 0x0000 - 0x7fff
   */
  struct ff_envelope {
  	__u16 attack_length;
  	__u16 attack_level;
  	__u16 fade_length;
  	__u16 fade_level;
  };
  
  /**
   * struct ff_constant_effect - defines parameters of a constant force-feedback effect
   * @level: strength of the effect; may be negative
   * @envelope: envelope data
   */
  struct ff_constant_effect {
  	__s16 level;
  	struct ff_envelope envelope;
  };
  
  /**
   * struct ff_ramp_effect - defines parameters of a ramp force-feedback effect
   * @start_level: beginning strength of the effect; may be negative
   * @end_level: final strength of the effect; may be negative
   * @envelope: envelope data
   */
  struct ff_ramp_effect {
  	__s16 start_level;
  	__s16 end_level;
  	struct ff_envelope envelope;
  };
  
  /**
   * struct ff_condition_effect - defines a spring or friction force-feedback effect
   * @right_saturation: maximum level when joystick moved all way to the right
   * @left_saturation: same for the left side
   * @right_coeff: controls how fast the force grows when the joystick moves
   *	to the right
   * @left_coeff: same for the left side
   * @deadband: size of the dead zone, where no force is produced
   * @center: position of the dead zone
   */
  struct ff_condition_effect {
  	__u16 right_saturation;
  	__u16 left_saturation;
  
  	__s16 right_coeff;
  	__s16 left_coeff;
  
  	__u16 deadband;
  	__s16 center;
  };
  
  /**
   * struct ff_periodic_effect - defines parameters of a periodic force-feedback effect
   * @waveform: kind of the effect (wave)
   * @period: period of the wave (ms)
   * @magnitude: peak value
   * @offset: mean value of the wave (roughly)
   * @phase: 'horizontal' shift
   * @envelope: envelope data
   * @custom_len: number of samples (FF_CUSTOM only)
   * @custom_data: buffer of samples (FF_CUSTOM only)
   *
   * Known waveforms - FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP,
   * FF_SAW_DOWN, FF_CUSTOM. The exact syntax FF_CUSTOM is undefined
   * for the time being as no driver supports it yet.
   *
   * Note: the data pointed by custom_data is copied by the driver.
   * You can therefore dispose of the memory after the upload/update.
   */
  struct ff_periodic_effect {
  	__u16 waveform;
  	__u16 period;
  	__s16 magnitude;
  	__s16 offset;
  	__u16 phase;
  
  	struct ff_envelope envelope;
  
  	__u32 custom_len;
  	__s16 __user *custom_data;
  };
  
  /**
   * struct ff_rumble_effect - defines parameters of a periodic force-feedback effect
   * @strong_magnitude: magnitude of the heavy motor
   * @weak_magnitude: magnitude of the light one
   *
   * Some rumble pads have two motors of different weight. Strong_magnitude
   * represents the magnitude of the vibration generated by the heavy one.
   */
  struct ff_rumble_effect {
  	__u16 strong_magnitude;
  	__u16 weak_magnitude;
  };
  
  /**
   * struct ff_effect - defines force feedback effect
   * @type: type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
   *	FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
   * @id: an unique id assigned to an effect
   * @direction: direction of the effect
   * @trigger: trigger conditions (struct ff_trigger)
   * @replay: scheduling of the effect (struct ff_replay)
   * @u: effect-specific structure (one of ff_constant_effect, ff_ramp_effect,
   *	ff_periodic_effect, ff_condition_effect, ff_rumble_effect) further
   *	defining effect parameters
   *
   * This structure is sent through ioctl from the application to the driver.
   * To create a new effect application should set its @id to -1; the kernel
   * will return assigned @id which can later be used to update or delete
   * this effect.
   *
   * Direction of the effect is encoded as follows:
   *	0 deg -> 0x0000 (down)
   *	90 deg -> 0x4000 (left)
   *	180 deg -> 0x8000 (up)
   *	270 deg -> 0xC000 (right)
   */
  struct ff_effect {
  	__u16 type;
  	__s16 id;
  	__u16 direction;
  	struct ff_trigger trigger;
  	struct ff_replay replay;
  
  	union {
  		struct ff_constant_effect constant;
  		struct ff_ramp_effect ramp;
  		struct ff_periodic_effect periodic;
  		struct ff_condition_effect condition[2]; /* One for each axis */
  		struct ff_rumble_effect rumble;
  	} u;
  };
  
  /*
   * Force feedback effect types
   */
  
  #define FF_RUMBLE	0x50
  #define FF_PERIODIC	0x51
  #define FF_CONSTANT	0x52
  #define FF_SPRING	0x53
  #define FF_FRICTION	0x54
  #define FF_DAMPER	0x55
  #define FF_INERTIA	0x56
  #define FF_RAMP		0x57
  
  #define FF_EFFECT_MIN	FF_RUMBLE
  #define FF_EFFECT_MAX	FF_RAMP
  
  /*
   * Force feedback periodic effect types
   */
  
  #define FF_SQUARE	0x58
  #define FF_TRIANGLE	0x59
  #define FF_SINE		0x5a
  #define FF_SAW_UP	0x5b
  #define FF_SAW_DOWN	0x5c
  #define FF_CUSTOM	0x5d
  
  #define FF_WAVEFORM_MIN	FF_SQUARE
  #define FF_WAVEFORM_MAX	FF_CUSTOM
  
  /*
   * Set ff device properties
   */
  
  #define FF_GAIN		0x60
  #define FF_AUTOCENTER	0x61
  
  #define FF_MAX		0x7f
  #define FF_CNT		(FF_MAX+1)
  
  #ifdef __KERNEL__
  
  /*
   * In-kernel definitions.
   */
  
  #include <linux/device.h>
  #include <linux/fs.h>
  #include <linux/timer.h>
  #include <linux/mod_devicetable.h>
  
  /**
   * struct input_dev - represents an input device
   * @name: name of the device
   * @phys: physical path to the device in the system hierarchy
   * @uniq: unique identification code for the device (if device has it)
   * @id: id of the device (struct input_id)
   * @propbit: bitmap of device properties and quirks
   * @evbit: bitmap of types of events supported by the device (EV_KEY,
   *	EV_REL, etc.)
   * @keybit: bitmap of keys/buttons this device has
   * @relbit: bitmap of relative axes for the device
   * @absbit: bitmap of absolute axes for the device
   * @mscbit: bitmap of miscellaneous events supported by the device
   * @ledbit: bitmap of leds present on the device
   * @sndbit: bitmap of sound effects supported by the device
   * @ffbit: bitmap of force feedback effects supported by the device
   * @swbit: bitmap of switches present on the device
   * @hint_events_per_packet: average number of events generated by the
   *	device in a packet (between EV_SYN/SYN_REPORT events). Used by
   *	event handlers to estimate size of the buffer needed to hold
   *	events.
   * @keycodemax: size of keycode table
   * @keycodesize: size of elements in keycode table
   * @keycode: map of scancodes to keycodes for this device
   * @getkeycode: optional legacy method to retrieve current keymap.
   * @setkeycode: optional method to alter current keymap, used to implement
   *	sparse keymaps. If not supplied default mechanism will be used.
   *	The method is being called while holding event_lock and thus must
   *	not sleep
   * @ff: force feedback structure associated with the device if device
   *	supports force feedback effects
   * @repeat_key: stores key code of the last key pressed; used to implement
   *	software autorepeat
   * @timer: timer for software autorepeat
   * @rep: current values for autorepeat parameters (delay, rate)
   * @mt: pointer to array of struct input_mt_slot holding current values
   *	of tracked contacts
   * @mtsize: number of MT slots the device uses
   * @slot: MT slot currently being transmitted
   * @trkid: stores MT tracking ID for the current contact
   * @absinfo: array of &struct input_absinfo elements holding information
   *	about absolute axes (current value, min, max, flat, fuzz,
   *	resolution)
   * @key: reflects current state of device's keys/buttons
   * @led: reflects current state of device's LEDs
   * @snd: reflects current state of sound effects
   * @sw: reflects current state of device's switches
   * @open: this method is called when the very first user calls
   *	input_open_device(). The driver must prepare the device
   *	to start generating events (start polling thread,
   *	request an IRQ, submit URB, etc.)
   * @close: this method is called when the very last user calls
   *	input_close_device().
   * @flush: purges the device. Most commonly used to get rid of force
   *	feedback effects loaded into the device when disconnecting
   *	from it
   * @event: event handler for events sent _to_ the device, like EV_LED
   *	or EV_SND. The device is expected to carry out the requested
   *	action (turn on a LED, play sound, etc.) The call is protected
   *	by @event_lock and must not sleep
   * @grab: input handle that currently has the device grabbed (via
   *	EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
   *	recipient for all input events coming from the device
   * @event_lock: this spinlock is is taken when input core receives
   *	and processes a new event for the device (in input_event()).
   *	Code that accesses and/or modifies parameters of a device
   *	(such as keymap or absmin, absmax, absfuzz, etc.) after device
   *	has been registered with input core must take this lock.
   * @mutex: serializes calls to open(), close() and flush() methods
   * @users: stores number of users (input handlers) that opened this
   *	device. It is used by input_open_device() and input_close_device()
   *	to make sure that dev->open() is only called when the first
   *	user opens device and dev->close() is called when the very
   *	last user closes the device
   * @going_away: marks devices that are in a middle of unregistering and
   *	causes input_open_device*() fail with -ENODEV.
   * @sync: set to %true when there were no new events since last EV_SYN
   * @dev: driver model's view of this device
   * @h_list: list of input handles associated with the device. When
   *	accessing the list dev->mutex must be held
   * @node: used to place the device onto input_dev_list
   */
  struct input_dev {
  	const char *name;
  	const char *phys;
  	const char *uniq;
  	struct input_id id;
  
  	unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
  
  	unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
  	unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
  	unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
  	unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
  	unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
  	unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
  	unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
  	unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
  	unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
  
  	unsigned int hint_events_per_packet;
  
  	unsigned int keycodemax;
  	unsigned int keycodesize;
  	void *keycode;
  
  	int (*setkeycode)(struct input_dev *dev,
  			  const struct input_keymap_entry *ke,
  			  unsigned int *old_keycode);
  	int (*getkeycode)(struct input_dev *dev,
  			  struct input_keymap_entry *ke);
  
  	struct ff_device *ff;
  
  	unsigned int repeat_key;
  	struct timer_list timer;
  
  	int rep[REP_CNT];
  
  	struct input_mt_slot *mt;
  	int mtsize;
  	int slot;
  	int trkid;
  
  	struct input_absinfo *absinfo;
  
  	unsigned long key[BITS_TO_LONGS(KEY_CNT)];
  	unsigned long led[BITS_TO_LONGS(LED_CNT)];
  	unsigned long snd[BITS_TO_LONGS(SND_CNT)];
  	unsigned long sw[BITS_TO_LONGS(SW_CNT)];
  
  	int (*open)(struct input_dev *dev);
  	void (*close)(struct input_dev *dev);
  	int (*flush)(struct input_dev *dev, struct file *file);
  	int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
  
  	struct input_handle __rcu *grab;
  
  	spinlock_t event_lock;
  	struct mutex mutex;
  
  	unsigned int users;
  	bool going_away;
  
  	bool sync;
  
  	struct device dev;
  
  	struct list_head	h_list;
  	struct list_head	node;
  };
  #define to_input_dev(d) container_of(d, struct input_dev, dev)
  
  /*
   * Verify that we are in sync with input_device_id mod_devicetable.h #defines
   */
  
  #if EV_MAX != INPUT_DEVICE_ID_EV_MAX
  #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
  #endif
  
  #if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
  #error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
  #endif
  
  #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
  #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
  #endif
  
  #if REL_MAX != INPUT_DEVICE_ID_REL_MAX
  #error "REL_MAX and INPUT_DEVICE_ID_REL_MAX do not match"
  #endif
  
  #if ABS_MAX != INPUT_DEVICE_ID_ABS_MAX
  #error "ABS_MAX and INPUT_DEVICE_ID_ABS_MAX do not match"
  #endif
  
  #if MSC_MAX != INPUT_DEVICE_ID_MSC_MAX
  #error "MSC_MAX and INPUT_DEVICE_ID_MSC_MAX do not match"
  #endif
  
  #if LED_MAX != INPUT_DEVICE_ID_LED_MAX
  #error "LED_MAX and INPUT_DEVICE_ID_LED_MAX do not match"
  #endif
  
  #if SND_MAX != INPUT_DEVICE_ID_SND_MAX
  #error "SND_MAX and INPUT_DEVICE_ID_SND_MAX do not match"
  #endif
  
  #if FF_MAX != INPUT_DEVICE_ID_FF_MAX
  #error "FF_MAX and INPUT_DEVICE_ID_FF_MAX do not match"
  #endif
  
  #if SW_MAX != INPUT_DEVICE_ID_SW_MAX
  #error "SW_MAX and INPUT_DEVICE_ID_SW_MAX do not match"
  #endif
  
  #define INPUT_DEVICE_ID_MATCH_DEVICE \
  	(INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
  #define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
  	(INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)
  
  struct input_handle;
  
  /**
   * struct input_handler - implements one of interfaces for input devices
   * @private: driver-specific data
   * @event: event handler. This method is being called by input core with
   *	interrupts disabled and dev->event_lock spinlock held and so
   *	it may not sleep
   * @filter: similar to @event; separates normal event handlers from
   *	"filters".
   * @match: called after comparing device's id with handler's id_table
   *	to perform fine-grained matching between device and handler
   * @connect: called when attaching a handler to an input device
   * @disconnect: disconnects a handler from input device
   * @start: starts handler for given handle. This function is called by
   *	input core right after connect() method and also when a process
   *	that "grabbed" a device releases it
   * @fops: file operations this driver implements
   * @minor: beginning of range of 32 minors for devices this driver
   *	can provide
   * @name: name of the handler, to be shown in /proc/bus/input/handlers
   * @id_table: pointer to a table of input_device_ids this driver can
   *	handle
   * @h_list: list of input handles associated with the handler
   * @node: for placing the driver onto input_handler_list
   *
   * Input handlers attach to input devices and create input handles. There
   * are likely several handlers attached to any given input device at the
   * same time. All of them will get their copy of input event generated by
   * the device.
   *
   * The very same structure is used to implement input filters. Input core
   * allows filters to run first and will not pass event to regular handlers
   * if any of the filters indicate that the event should be filtered (by
   * returning %true from their filter() method).
   *
   * Note that input core serializes calls to connect() and disconnect()
   * methods.
   */
  struct input_handler {
  
  	void *private;
  
  	void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
  	bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
  	bool (*match)(struct input_handler *handler, struct input_dev *dev);
  	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
  	void (*disconnect)(struct input_handle *handle);
  	void (*start)(struct input_handle *handle);
  
  	const struct file_operations *fops;
  	int minor;
  	const char *name;
  
  	const struct input_device_id *id_table;
  
  	struct list_head	h_list;
  	struct list_head	node;
  };
  
  /**
   * struct input_handle - links input device with an input handler
   * @private: handler-specific data
   * @open: counter showing whether the handle is 'open', i.e. should deliver
   *	events from its device
   * @name: name given to the handle by handler that created it
   * @dev: input device the handle is attached to
   * @handler: handler that works with the device through this handle
   * @d_node: used to put the handle on device's list of attached handles
   * @h_node: used to put the handle on handler's list of handles from which
   *	it gets events
   */
  struct input_handle {
  
  	void *private;
  
  	int open;
  	const char *name;
  
  	struct input_dev *dev;
  	struct input_handler *handler;
  
  	struct list_head	d_node;
  	struct list_head	h_node;
  };
  
  struct input_dev *input_allocate_device(void);
  void input_free_device(struct input_dev *dev);
  
  static inline struct input_dev *input_get_device(struct input_dev *dev)
  {
  	return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
  }
  
  static inline void input_put_device(struct input_dev *dev)
  {
  	if (dev)
  		put_device(&dev->dev);
  }
  
  static inline void *input_get_drvdata(struct input_dev *dev)
  {
  	return dev_get_drvdata(&dev->dev);
  }
  
  static inline void input_set_drvdata(struct input_dev *dev, void *data)
  {
  	dev_set_drvdata(&dev->dev, data);
  }
  
  int __must_check input_register_device(struct input_dev *);
  void input_unregister_device(struct input_dev *);
  
  void input_reset_device(struct input_dev *);
  
  int __must_check input_register_handler(struct input_handler *);
  void input_unregister_handler(struct input_handler *);
  
  int input_handler_for_each_handle(struct input_handler *, void *data,
  				  int (*fn)(struct input_handle *, void *));
  
  int input_register_handle(struct input_handle *);
  void input_unregister_handle(struct input_handle *);
  
  int input_grab_device(struct input_handle *);
  void input_release_device(struct input_handle *);
  
  int input_open_device(struct input_handle *);
  void input_close_device(struct input_handle *);
  
  int input_flush_device(struct input_handle *handle, struct file *file);
  
  void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
  void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
  
  static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
  {
  	input_event(dev, EV_KEY, code, !!value);
  }
  
  static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
  {
  	input_event(dev, EV_REL, code, value);
  }
  
  static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
  {
  	input_event(dev, EV_ABS, code, value);
  }
  
  static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
  {
  	input_event(dev, EV_FF_STATUS, code, value);
  }
  
  static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
  {
  	input_event(dev, EV_SW, code, !!value);
  }
  
  static inline void input_sync(struct input_dev *dev)
  {
  	input_event(dev, EV_SYN, SYN_REPORT, 0);
  }
  
  static inline void input_mt_sync(struct input_dev *dev)
  {
  	input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
  }
  
  void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
  
  /**
   * input_set_events_per_packet - tell handlers about the driver event rate
   * @dev: the input device used by the driver
   * @n_events: the average number of events between calls to input_sync()
   *
   * If the event rate sent from a device is unusually large, use this
   * function to set the expected event rate. This will allow handlers
   * to set up an appropriate buffer size for the event stream, in order
   * to minimize information loss.
   */
  static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
  {
  	dev->hint_events_per_packet = n_events;
  }
  
  void input_alloc_absinfo(struct input_dev *dev);
  void input_set_abs_params(struct input_dev *dev, unsigned int axis,
  			  int min, int max, int fuzz, int flat);
  
  #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item)			\
  static inline int input_abs_get_##_suffix(struct input_dev *dev,	\
  					  unsigned int axis)		\
  {									\
  	return dev->absinfo ? dev->absinfo[axis]._item : 0;		\
  }									\
  									\
  static inline void input_abs_set_##_suffix(struct input_dev *dev,	\
  					   unsigned int axis, int val)	\
  {									\
  	input_alloc_absinfo(dev);					\
  	if (dev->absinfo)						\
  		dev->absinfo[axis]._item = val;				\
  }
  
  INPUT_GENERATE_ABS_ACCESSORS(val, value)
  INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
  INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
  INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
  INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
  INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
  
  int input_scancode_to_scalar(const struct input_keymap_entry *ke,
  			     unsigned int *scancode);
  
  int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
  int input_set_keycode(struct input_dev *dev,
  		      const struct input_keymap_entry *ke);
  
  extern struct class input_class;
  
  /**
   * struct ff_device - force-feedback part of an input device
   * @upload: Called to upload an new effect into device
   * @erase: Called to erase an effect from device
   * @playback: Called to request device to start playing specified effect
   * @set_gain: Called to set specified gain
   * @set_autocenter: Called to auto-center device
   * @destroy: called by input core when parent input device is being
   *	destroyed
   * @private: driver-specific data, will be freed automatically
   * @ffbit: bitmap of force feedback capabilities truly supported by
   *	device (not emulated like ones in input_dev->ffbit)
   * @mutex: mutex for serializing access to the device
   * @max_effects: maximum number of effects supported by device
   * @effects: pointer to an array of effects currently loaded into device
   * @effect_owners: array of effect owners; when file handle owning
   *	an effect gets closed the effect is automatically erased
   *
   * Every force-feedback device must implement upload() and playback()
   * methods; erase() is optional. set_gain() and set_autocenter() need
   * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
   * bits.
   *
   * Note that playback(), set_gain() and set_autocenter() are called with
   * dev->event_lock spinlock held and interrupts off and thus may not
   * sleep.
   */
  struct ff_device {
  	int (*upload)(struct input_dev *dev, struct ff_effect *effect,
  		      struct ff_effect *old);
  	int (*erase)(struct input_dev *dev, int effect_id);
  
  	int (*playback)(struct input_dev *dev, int effect_id, int value);
  	void (*set_gain)(struct input_dev *dev, u16 gain);
  	void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
  
  	void (*destroy)(struct ff_device *);
  
  	void *private;
  
  	unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
  
  	struct mutex mutex;
  
  	int max_effects;
  	struct ff_effect *effects;
  	struct file *effect_owners[];
  };
  
  int input_ff_create(struct input_dev *dev, unsigned int max_effects);
  void input_ff_destroy(struct input_dev *dev);
  
  int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
  
  int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
  int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
  
  int input_ff_create_memless(struct input_dev *dev, void *data,
  		int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
  
  #endif
  #endif
  