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如何在Linux中调试USB HID scancode-keycode转换

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我最近将一个122键的终端键盘转换为USB作为配置USB小工具(键盘部分使用的是HID代码),它运行得很好,除了我似乎无法让我的Archlinux安装识别某些HID代码(特别是在F13-F24)并将它们转换成我可以在X中使用的事件代码.

正确收到HID代码

我能够通过/ dev / hidraw2看到计算机收到HID(下面的输出是按F24,HID代码0x73基于：https://gist.github.com/MightyPork/6da26e382a7ad91b5496ee55fdc73db2.

    sudo hexdump -C /dev/hidraw2
00000000  00 00 00 00 00 00 00 00  00 00 73 00 00 00 00 00  |..........s.....|

HID代码未转换为事件

但是,一旦我尝试showkey -s,evtest或xev,我什么都没有,就好像我没有按键.所有“普通”HID代码都可以工作(实际上这条消息现在正在键盘上输入),所以它必须是收到HID代码和翻译之间的东西.

有趣的是,我的evtest功能没有列出F13-F24的事件代码(见下文),但我已经看到这些功能列在其他人的输出中(例如https://unix.stackexchange.com/questions/130656/how-to-get-all-my-keys-to-send-keycodes).

    Input driver version is 1.0.1
Input device ID: bus 0x3 vendor 0x1d6b product 0x104 version 0x101
Input device name: "CPMH 122 Gadget"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 1 (KEY_ESC)
    Event code 2 (KEY_1)
    Event code 3 (KEY_2)
    Event code 4 (KEY_3)
    Event code 5 (KEY_4)
    Event code 6 (KEY_5)
    Event code 7 (KEY_6)
    Event code 8 (KEY_7)
    Event code 9 (KEY_8)
    Event code 10 (KEY_9)
    Event code 11 (KEY_0)
    Event code 12 (KEY_MINUS)
    Event code 13 (KEY_EQUAL)
    Event code 14 (KEY_BACKSPACE)
    Event code 15 (KEY_TAB)
    Event code 16 (KEY_Q)
    Event code 17 (KEY_W)
    Event code 18 (KEY_E)
    Event code 19 (KEY_R)
    Event code 20 (KEY_T)
    Event code 21 (KEY_Y)
    Event code 22 (KEY_U)
    Event code 23 (KEY_I)
    Event code 24 (KEY_O)
    Event code 25 (KEY_P)
    Event code 26 (KEY_LEFTBRACE)
    Event code 27 (KEY_RIGHTBRACE)
    Event code 28 (KEY_ENTER)
    Event code 29 (KEY_LEFTCTRL)
    Event code 30 (KEY_A)
    Event code 31 (KEY_S)
    Event code 32 (KEY_D)
    Event code 33 (KEY_F)
    Event code 34 (KEY_G)
    Event code 35 (KEY_H)
    Event code 36 (KEY_J)
    Event code 37 (KEY_K)
    Event code 38 (KEY_L)
    Event code 39 (KEY_SEMICOLON)
    Event code 40 (KEY_APOSTROPHE)
    Event code 41 (KEY_GRAVE)
    Event code 42 (KEY_LEFTSHIFT)
    Event code 43 (KEY_BACKSLASH)
    Event code 44 (KEY_Z)
    Event code 45 (KEY_X)
    Event code 46 (KEY_C)
    Event code 47 (KEY_V)
    Event code 48 (KEY_B)
    Event code 49 (KEY_N)
    Event code 50 (KEY_M)
    Event code 51 (KEY_COMMA)
    Event code 52 (KEY_DOT)
    Event code 53 (KEY_SLASH)
    Event code 54 (KEY_RIGHTSHIFT)
    Event code 55 (KEY_KPASTERISK)
    Event code 56 (KEY_LEFTALT)
    Event code 57 (KEY_SPACE)
    Event code 58 (KEY_CAPSLOCK)
    Event code 59 (KEY_F1)
    Event code 60 (KEY_F2)
    Event code 61 (KEY_F3)
    Event code 62 (KEY_F4)
    Event code 63 (KEY_F5)
    Event code 64 (KEY_F6)
    Event code 65 (KEY_F7)
    Event code 66 (KEY_F8)
    Event code 67 (KEY_F9)
    Event code 68 (KEY_F10)
    Event code 69 (KEY_NUMLOCK)
    Event code 70 (KEY_SCROLLLOCK)
    Event code 71 (KEY_KP7)
    Event code 72 (KEY_KP8)
    Event code 73 (KEY_KP9)
    Event code 74 (KEY_KPMINUS)
    Event code 75 (KEY_KP4)
    Event code 76 (KEY_KP5)
    Event code 77 (KEY_KP6)
    Event code 78 (KEY_KPPLUS)
    Event code 79 (KEY_KP1)
    Event code 80 (KEY_KP2)
    Event code 81 (KEY_KP3)
    Event code 82 (KEY_KP0)
    Event code 83 (KEY_KPDOT)
    Event code 86 (KEY_102ND)
    Event code 87 (KEY_F11)
    Event code 88 (KEY_F12)
    Event code 96 (KEY_KPENTER)
    Event code 97 (KEY_RIGHTCTRL)
    Event code 98 (KEY_KPSLASH)
    Event code 99 (KEY_SYSRQ)
    Event code 100 (KEY_RIGHTALT)
    Event code 102 (KEY_HOME)
    Event code 103 (KEY_UP)
    Event code 104 (KEY_PAGEUP)
    Event code 105 (KEY_LEFT)
    Event code 106 (KEY_RIGHT)
    Event code 107 (KEY_END)
    Event code 108 (KEY_DOWN)
    Event code 109 (KEY_PAGEDOWN)
    Event code 110 (KEY_INSERT)
    Event code 111 (KEY_DELETE)
    Event code 119 (KEY_PAUSE)
    Event code 125 (KEY_LEFTMETA)
    Event code 126 (KEY_RIGHTMETA)
    Event code 127 (KEY_COMPOSE)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
  Event type 17 (EV_LED)
    Event code 0 (LED_NUML) state 1
    Event code 1 (LED_CAPSL) state 0
    Event code 2 (LED_SCROLLL) state 0
    Event code 3 (LED_COMPOSE) state 0
    Event code 4 (LED_KANA) state 0
Key repeat handling:
  Repeat type 20 (EV_REP)
    Repeat code 0 (REP_DELAY)
      Value    250
    Repeat code 1 (REP_PERIOD)
      Value     33

是司机吗？

根据我的evtest EV_KEY功能与其他人之间的差异,我看到我认为可能是因为我的驱动程序无法将USB HID代码映射到相应的事件代码.

使用hwinfo我可以告诉我的键盘正在使用hid-generic驱动程序.查看hid-input.c(http://elixir.free-electrons.com/linux/v3.5.2/source/drivers/hid/hid-input.c)的源代码我可以看到映射确实存在(HID代码0x73映射到194,映射到KEY_F24事件,至少根据我在此处找到的内容：https://github.com/wayland-project/libinput/blob/master/include/linux/input-event-codes.h).因此,我从在线阅读的内容中得到了引导,认为问题存在于hid-generic和libinput之间.

我不知道从哪里开始,没有任何东西从evtest中出来我不知道要把钥匙映射到什么地方.只是没有定义这些键的功能吗？反正有没有指定我的键盘功能evdev？

解决方法:

发现了问题.在查看了usbhid的代码之后,我意识到这是分配evtest发现的可用事件代码的原因.为此,它通过HID描述符进行读取.事实证明,我使用了通用HID描述符,逻辑最大值和使用最大值切断了编号较高的HID代码.我使用https://github.com/DIGImend/hidrd来获取二进制描述符的可编辑版本,然后将Usage Maximum和Logical Maximum更改为我使用的最高HID代码.将其重新转换为二进制格式,上传并启动键盘.现在evtest识别所有键.

这是我的原始规格：

Usage Page (Desktop),               ; Generic desktop controls (01h)
Usage (Keyboard),                   ; Keyboard (06h, application collection)
Collection (Application),
    Usage Page (Keyboard),          ; Keyboard/keypad (07h)
    Usage Minimum (KB Leftcontrol), ; Keyboard left control (E0h, dynamic value)
    Usage Maximum (KB Right GUI),   ; Keyboard right GUI (E7h, dynamic value)
    Logical Minimum (0),
    Logical Maximum (1),
    Report Size (1),
    Report Count (8),
    Input (Variable),
    Report Count (1),
    Report Size (8),
    Input (Constant, Variable),
    Report Count (5),
    Report Size (1),
    Usage Page (LED),               ; LEDs (08h)
    Usage Minimum (01h),
    Usage Maximum (05h),
    Output (Variable),
    Report Count (1),
    Report Size (3),
    Output (Constant, Variable),
    Report Count (6),
    Report Size (8),
    Logical Minimum (0),
    Logical Maximum (101),
    Usage Page (Keyboard),          ; Keyboard/keypad (07h)
    Usage Minimum (None),           ; No event (00h, selector)
    Usage Maximum (KB Application), ; Keyboard Application (65h, selector)
    Input,
End Collection

我的更新规格：

Usage Page (Desktop),               ; Generic desktop controls (01h)
Usage (Keyboard),                   ; Keyboard (06h, application collection)
Collection (Application),
    Usage Page (Keyboard),          ; Keyboard/keypad (07h)
    Usage Minimum (KB Leftcontrol), ; Keyboard left control (E0h, dynamic value)
    Usage Maximum (KB Right GUI),   ; Keyboard right GUI (E7h, dynamic value)
    Logical Minimum (0),
    Logical Maximum (1),
    Report Size (1),
    Report Count (8),
    Input (Variable),
    Report Count (1),
    Report Size (8),
    Input (Constant, Variable),
    Report Count (5),
    Report Size (1),
    Usage Page (LED),               ; LEDs (08h)
    Usage Minimum (01h),
    Usage Maximum (05h),
    Output (Variable),
    Report Count (1),
    Report Size (3),
    Output (Constant, Variable),
    Report Count (6),
    Report Size (8),
    Logical Minimum (0),
    Logical Maximum (115),
    Usage Page (Keyboard),          ; Keyboard/keypad (07h)
    Usage Minimum (None),           ; No event (00h, selector)
    Usage Maximum (KB F24),         ; Keyboard F24 (73h, selector)
    Input,
End Collection

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