Linux驱动 之 input子系统--input.h

#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
#include
#else
#include
#include
#include
#include
#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;//总线类型
 __u16 vendor;//供应商
 __u16 product;//产品
 __u16 version;//版本
};

/**
 * absolute：绝对
 * struct input_absinfo - used by EVIOCGABS/EVIOCSABS ioctls
 * @value: latest reported value for the axis.
 * @value: 最后报告的坐标值
 * @minimum: specifies minimum value for the axis.
 * @minimum: 坐标指定的最小值
 * @maximum: specifies maximum value for the axis.
 * @maximum: 坐标指定的最大值
 * @fuzz: specifies（指定） fuzz（模糊） value that is used to filter noise（噪音） from
 * the event stream（流）.
 * @flat: values that are within this value will be discarded（丢弃） by
 * joydev interface and reported as 0 instead（代替）.
 * @resolution: specifies resolution（分辨率） for the values reported for
 * the axis（坐标轴）.
 *
 * （Note that）（注意) input core does not clamp reported values to the
 * [minimum, maximum] limits, such task is left(由…来决定) to userspace（用户空间）.
 *
 * Resolution for main axes (ABS_X, ABS_Y, ABS_Z) is reported in
 * units per millimeter（毫米） (units/mm), resolution for rotational axes
 * (ABS_RX, ABS_RY, ABS_RZ) is reported in units per radian（弧度）.
 */
struct input_absinfo {
 __s32 value;
 __s32 minimum;
 __s32 maximum;
 __s32 fuzz;
 __s32 flat;
 __s32 resolution;
};

/**
 * struct input_keymap_entry（入口） - used by EVIOCGKEYCODE/EVIOCSKEYCODE（eviocgkeycode/eviocskeycode） ioctls
 * @scancode: scancode(扫描码) represented（代表） （in machine-endian）（机器字节序） form（形式）.
 * @len: length of the scancode that resides（在，居住，存在于） in @scancode buffer.
 * @index: index in the keymap, may be used instead（代替） of scancode
 * @flags: allows to specify（指定） how kernel should handle（处理） the request. For
 * example, setting INPUT_KEYMAP_BY_INDEX flag indicates（表明） that kernel
 * should perform（执行） lookup（查找） in keymap by @index instead of @scancode
 * @keycode: key code assigned（分配，指定） to this scancode
 *
 * The structure is used to retrieve（检索） and modify（修改） keymap data. Users have
 * option（选项） of （performing lookup）（执行检查） either by @scancode itself or by @index
 * in keymap entry. EVIOCGKEYCODE will also return scancode or index
 * (depending on which element（元素） 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];
};

/**
 * 1、ioctl()命令的定义。
 * 2、定义input子系统ioctl命令
*/
#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（位置） 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（提取）.
 *
 * 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（属性） and quirks
 */

#define INPUT_PROP_POINTER  0x00 /* needs a pointer */
#define INPUT_PROP_DIRECT  0x01 /* direct（直接输入） 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   //同步事件
#define EV_KEY   0x01   //键盘事件
#define EV_REL   0x02   //相对事件
#define EV_ABS   0x03   //绝对事件
#define EV_MSC   0x04   //
#define EV_SW   0x05          //
#define EV_LED   0x11   //LED事件
#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.（同步事件）
 */

#define SYN_REPORT  0  //同步上报
#define SYN_CONFIG  1
#define SYN_MT_REPORT  2
#define SYN_DROPPED  3

/*
 * Keys and buttons
 *
 * Most of the keys/buttons are (modeled after)(模仿) USB HUT 1.12
 * (see http://www.usb.org/developers/hidpage).
 * Abbreviations in the comments（解释）:
 * AC - Application Control（应用控制）
 * AL - Application Launch Button（应用程序启动按钮）
 * SC - System Control（系统控制）
 */

#define KEY_RESERVED  0   //保留
#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   //MINUS：负号、减号
#define KEY_EQUAL  13   //等于号
#define KEY_BACKSPACE  14  //退格
#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   //BRACE：大括号
#define KEY_RIGHTBRACE  27
#define KEY_ENTER  28   //回车
#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   //SEMICOLON：分号
#define KEY_APOSTROPHE  40   //APOSTROPHE：省略号
#define KEY_GRAVE  41
#define KEY_LEFTSHIFT  42
#define KEY_BACKSLASH  43   //BACKSLASH：反斜杠
#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   //逗号
#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   //大写锁定
#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  //KP：小键盘
#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)(遥控器), NUMERIC：数字*/
#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（避免、避开） low common keys in module aliases（别名） so they don't get huge. */
#define KEY_MIN_INTERESTING KEY_MUTE
#define KEY_MAX   0x2ff
#define KEY_CNT   (KEY_MAX+1)

/*
 * Relative axes相对坐标
 */

#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   //WHEEL：旋转
#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（修改） */
#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（开关事件）
 */

#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（杂项事件）
 */

#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   //PERIOD:周期
#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（期间、持续） values are expressed in ms. Values above（超过） 32767 ms (0x7fff)
 * should not be used and have unspecified（未定义、未知） 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（强迫） feedback（反馈） effect（作用） 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
#include
#include
#include

/**
 * struct input_dev - represents an input device   struct input_dev - 表示一个输入设备
 * @name: name of the device  设备名
 * @phys: physical path to the device in the system hierarchy（层）  系统层设备的物理路径
 * @uniq: （unique identification）（唯一标识） code for the device (if device has it)  设备标识码
 * @id: id of the device (struct input_id)   设备ID
 * @propbit: bitmap of device properties and quirks  设备属性位图
 * @evbit: bitmap of types of events supported by the device (EV_KEY,
 * EV_REL, etc.)  设备支持的事件类型位图，如：EV_KEY,EV_REL,etc.
 * @keybit: bitmap of keys/buttons this device has  键盘按键位图
 * @relbit: bitmap of relative axes for the device  相对坐标位图
 * @absbit: bitmap of absolute axes for the device  绝对坐标位图
 * @mscbit: bitmap of miscellaneous events supported by the device  设备支持的混杂类事件位图
 * @ledbit: bitmap of leds present on the device  LEDs位图
 * @sndbit: bitmap of sound effects supported by the device  音效位图
 * @ffbit: bitmap of force feedback effects supported by the device  力反馈位图
 * @swbit: bitmap of switches present on the device  开关位图
 * @hint_events_per_packet: （average number）（平均数） of events generated by the
 * device in a packet (between EV_SYN/SYN_REPORT events). Used by
 * （event handlers）（事件处理器） to estimate（估计、估算） size of the buffer needed to
 * events.
 * @keycodemax: size of keycode table按键码表的大小
 * @keycodesize: size of elements in keycode table按键码表中元素的大小
 * @keycode: map of scancodes to keycodes for this device扫描码到键码的映射
 * @getkeycode: optional（可选） legacy（遗留） method to retrieve（恢复） current keymap.
 * @setkeycode: optional method to alter（改变） current keymap, used to implement（实现）
 * sparse（稀少的） keymaps. If not supplied（提供） default（默认） mechanism（机制、原理） will be used.
 * The method is being called while holding event_lock and thus must
 * not sleep
 * @ff: force feedback structure （associated with）（与…有关） the device if device
 * supports force feedback effects
 * @repeat_key: stores key code of the last key pressed（按下）; used to implement（实现）
 * software autorepeat（repeat：重复）
 * @timer: timer for software autorepeat
 * @rep: current values for autorepeat parameters（参数） (delay, rate（率）)
 * @mt: pointer to array of struct input_mt_slot holding current values
 * of tracked（跟踪） contacts
 * @mtsize: number of MT slots the device uses
 * @slot: MT slot currently being transmitted（传输）
 * @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（分辨率）)
 * @key: reflects（反应） 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（轮询） thread（线程）,
 * request an IRQ, submit（提交） 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（断开）
 * 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（保护）
 * by @event_lock and must not sleep
 * @grab: input handle that currently has the device grabbed（捕获） (via
 * EVIOCGRAB ioctl). When a handle grabs a device it becomes sole（唯一的）
 * recipient（接受者） 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（使连续、串行化） 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（引起） 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）（与…有关） the device. When
 * accessing（访问） the list dev->mutex must be held
 * @node: used to place the device onto input_dev_list
 */
struct input_dev {
 const char *name;   //设备名
 const char *phys;   //系统层设备的物理路径
 const char *uniq;   //设备标识码
 struct input_id id; //设备ID

 unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];  //设备属性位图

 unsigned long evbit[BITS_TO_LONGS(EV_CNT)];       //设备支持的事件类型位图，如：EV_KEY,EV_REL,etc.
 unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];     //键盘按键位图    CNT:count的缩写
 unsigned long relbit[BITS_TO_LONGS(REL_CNT)];     //相对坐标位图
 unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];     //绝对坐标位图
 unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];     //设备支持的混杂类事件位图
 unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];     //LEDs位图
 unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];     //音效位图
 unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];       //力反馈位图
 unsigned long swbit[BITS_TO_LONGS(SW_CNT)];       //开关位图

 unsigned int hint_events_per_packet;      //

 unsigned int keycodemax;     //按键码表的大小
 unsigned int keycodesize;    //按键码表中元素的大小
 void *keycode;      //扫描码到键码的映射

 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;   //存储着最后一次按下的按键值，用于软件自动重试
 struct timer_list timer;   //自动重试时间

 int rep[REP_CNT];    //自动重试参数的当前值

 struct input_mt_slot *mt;   //
 int mtsize;   //
 int slot;     //
 int trkid;    //

 struct input_absinfo *absinfo;   //

 unsigned long key[BITS_TO_LONGS(KEY_CNT)];   //按键的当前状态
 unsigned long led[BITS_TO_LONGS(LED_CNT)];   //led的当前状态
 unsigned long snd[BITS_TO_LONGS(SND_CNT)];   //sound
 unsigned long sw[BITS_TO_LONGS(SW_CNT)];     //switch

 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;         //设备注销/输入设备打开时引起-ENODEV错误  设置此位

 bool sync;               //无新事件时，置1

 struct device dev;       //

 struct list_head h_list;   //input handles链表
 struct list_head node;     //链入input_dev_list链表
};
#define to_input_dev(d) container_of(d, struct input_dev, dev)

/*
 * Verify（核实） 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  //驱动私有数据
 * @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 {    //输入事件处理器

 void *private;   //驱动私有数据

 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