我目前正在尝试将我的图形输入板上的按钮作为键码选取。由于更多程序支持键盘快捷键而不是额外的鼠标按钮（例如，Krita 似乎只支持左键单击和右键单击），因此我希望能够将平板电脑按钮视为键码，以便我可以在不同的程序中为它们分配快捷键。
到目前为止我做了什么
我创建了一个 udev hwdb 文件 ( /etc/udev/hwdb.d/90-huion.hwdb) 以将平板电脑的扫描代码映射到键代码。
我的 hwdb 文件如下所示：
evdev:input:b0003v256Cp006Ee0111*
KEYBOARD_KEY_90001=a
KEYBOARD_KEY_90002=a
KEYBOARD_KEY_90003=a
KEYBOARD_KEY_90004=a
KEYBOARD_KEY_90005=a
KEYBOARD_KEY_90006=a
KEYBOARD_KEY_90007=a
KEYBOARD_KEY_90008=a
KEYBOARD_KEY_90009=a
KEYBOARD_KEY_9000a=a
MANUAL_OVERRIDE=1
搜索部分使用了我在此处找到的 event23 的值：
cat /sys/class/input/event23/device/id/bustype > 0003 cat /sys/class/input/event23/device/id/product > 006e cat /sys/class/input/event23/device/id/vendor > 256c cat /sys/class/input/event23/device/id/version > 0111我无法根据设备名称进行映射，因为它有一个冒号 (HID 256c:006e Pad)，而且我认为该名称与使用冒号作为分隔符的 hwdb 文件不能很好地配合。
我已将其加载hwdb.bin并重新加载并（重新）触发了 udev 规则
sudo systemd-hwdb update
sudo udevadmin trigger
sudo udevadm control --reload
我也尝试过用旧版本更新 hwdb，
sudo udevadm hwdb --update没有任何区别。我还尝试过拔下并重新插入平板电脑。
使用udevadm info我可以看到我的文件正在使用（因此该MANUAL_OVERRIDE=1部分不执行任何操作）。
udevadm info输出：
P: /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.1/1-2.1.1/1-2.1.1:1.0/0003:256C:006E.0004/input/input23/event23
N: input/event23
L: 0
S: input/by-id/usb-256c_006e-event-mouse
S: input/by-path/pci-0000:00:14.0-usb-0:2.1.1:1.0-event-mouse
E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.1/1-2.1.1/1-2.1.1:1.0/0003:256C:006E.0004/input/input23/event23
E: DEVNAME=/dev/input/event23
E: MAJOR=13
E: MINOR=87
E: SUBSYSTEM=input
E: USEC_INITIALIZED=5852671
E: KEYBOARD_KEY_90001=a
E: KEYBOARD_KEY_90002=a
E: KEYBOARD_KEY_90003=a
E: KEYBOARD_KEY_90004=a
E: KEYBOARD_KEY_90005=a
E: KEYBOARD_KEY_90006=a
E: KEYBOARD_KEY_90007=a
E: KEYBOARD_KEY_90008=a
E: KEYBOARD_KEY_90009=a
E: KEYBOARD_KEY_9000a=a
E: MANUAL_OVERRIDE=1
E: ID_INPUT=1
E: ID_INPUT_TABLET=1
E: ID_INPUT_KEY=1
E: ID_VENDOR=256c
E: ID_VENDOR_ENC=256c
E: ID_VENDOR_ID=256c
E: ID_MODEL=006e
E: ID_MODEL_ENC=006e
E: ID_MODEL_ID=006e
E: ID_REVISION=3000
E: ID_SERIAL=256c_006e
E: ID_TYPE=hid
E: ID_BUS=usb
E: ID_USB_INTERFACES=:030102:
E: ID_USB_INTERFACE_NUM=00
E: ID_USB_DRIVER=usbhid
E: ID_PATH=pci-0000:00:14.0-usb-0:2.1.1:1.0
E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_2_1_1_1_0
E: ID_INPUT_TABLET_PAD=1
E: LIBINPUT_DEVICE_GROUP=3/256c/6e:usb-0000:00:14.0-2.1
E: DEVLINKS=/dev/input/by-id/usb-256c_006e-event-mouse /dev/input/by-path/pci-0000:00:14.0-usb-0:2.1.1:1.0-event-mouse
E: TAGS=:power-switch:aaaaaaaaaa
调试
测试
据我所知，这应该是映射平板电脑按钮所需的全部内容，甚至看起来（大部分）有希望evtest：
Testing ... (interrupt to exit)
Event: time 1589801905.094479, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1589801905.094479, type 1 (EV_KEY), code 30 (KEY_A), value 1
Event: time 1589801905.094479, -------------- SYN_REPORT ------------
Event: time 1589801905.252456, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1589801905.252456, type 1 (EV_KEY), code 30 (KEY_A), value 0
Event: time 1589801905.252456, -------------- SYN_REPORT ------------
Event: time 1589801906.960440, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90002
Event: time 1589801906.960440, type 1 (EV_KEY), code 30 (KEY_A), value 1
...
Event: time 1589801913.582373, -------------- SYN_REPORT ------------
Event: time 1589801913.936376, type 4 (EV_MSC), code 4 (MSC_SCAN), value 9000a
Event: time 1589801913.936376, type 1 (EV_KEY), code 30 (KEY_A), value 1
Event: time 1589801913.936376, -------------- SYN_REPORT ------------
Event: time 1589801914.086370, type 4 (EV_MSC), code 4 (MSC_SCAN), value 9000a
Event: time 1589801914.086370, type 1 (EV_KEY), code 30 (KEY_A), value 0
Event: time 1589801914.086370, -------------- SYN_REPORT ------------
Event: time 1589801914.992371, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1589801914.992371, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 1
Event: time 1589801914.992371, -------------- SYN_REPORT ------------
Event: time 1589801915.154366, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1589801915.154366, type 1 (EV_KEY), code 304 (BTN_SOUTH), value 0
Event: time 1589801915.154366, -------------- SYN_REPORT ------------
Event: time 1589801915.358379, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90002
Event: time 1589801915.358379, type 1 (EV_KEY), code 305 (BTN_EAST), value 1
Event: time 1589801915.358379, -------------- SYN_REPORT ------------
Event: time 1589801915.446357, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90002
Event: time 1589801915.446357, type 1 (EV_KEY), code 305 (BTN_EAST), value 0
Event: time 1589801915.446357, -------------- SYN_REPORT ------------
除了最后两个按钮（BTN_SOUTH 和 BTN_EAST）似乎没有被映射（可能是因为它们具有与映射的按钮相同的扫描码）之外，所有其他按钮都正确报告code 30 (KEY_A)（如果您知道为什么这些按钮）我很想知道两个按钮没有映射，但这不是我现在想要关注的问题）。
谢夫
仅使用xev似乎未正确映射的两个按钮，以下是xev这两个按钮的控制台输出：
ButtonPress event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 8912753, (1,806), root:(971,821),
state 0x0, button 15, same_screen YES
ButtonRelease event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 8912953, (1,806), root:(971,821),
state 0x0, button 15, same_screen YES
ButtonPress event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 8913377, (1,806), root:(971,821),
state 0x0, button 16, same_screen YES
ButtonRelease event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 8913581, (1,806), root:(971,821),
state 0x0, button 16, same_screen YES
在进行 hwdb 更改之前，按钮被选取为按钮 1-3 和 8-16（未映射的按钮 15 和 16 在 的输出中分别是按钮 BTN_SOUTH 和 BTN_EAST evtest），但现在xev看不到其中的大多数（仅未映射的 15 和 16）。
消息
使用sudo dmesg --follow我没有看到任何看起来像未知按键的事件。
埃维梅努
evemu-describehwdb 更改之前的输出：
# EVEMU 1.3
# Kernel: 5.7.0-1-MANJARO
# DMI: dmi:bvnAmericanMegatrendsInc.:bvr1205:bd05/11/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ270-P:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
# Input device name: "HID 256c:006e Pad"
# Input device ID: bus 0x03 vendor 0x256c product 0x6e version 0x111
# Supported events:
# Event type 0 (EV_SYN)
# Event code 0 (SYN_REPORT)
# Event code 1 (SYN_CONFIG)
# Event code 2 (SYN_MT_REPORT)
# Event code 3 (SYN_DROPPED)
# Event code 4 ((null))
# Event code 5 ((null))
# Event code 6 ((null))
# Event code 7 ((null))
# Event code 8 ((null))
# Event code 9 ((null))
# Event code 10 ((null))
# Event code 11 ((null))
# Event code 12 ((null))
# Event code 13 ((null))
# Event code 14 ((null))
# Event code 15 (SYN_MAX)
# Event type 1 (EV_KEY)
# Event code 256 (BTN_0)
# Event code 257 (BTN_1)
# Event code 258 (BTN_2)
# Event code 259 (BTN_3)
# Event code 260 (BTN_4)
# Event code 261 (BTN_5)
# Event code 262 (BTN_6)
# Event code 263 (BTN_7)
# Event code 264 (BTN_8)
# Event code 265 (BTN_9)
# Event code 304 (BTN_SOUTH)
# Event code 305 (BTN_EAST)
# Event code 306 (BTN_C)
# Event code 331 (BTN_STYLUS)
# Event type 3 (EV_ABS)
# Event code 0 (ABS_X)
# Value 0
# Min 0
# Max 1
# Fuzz 0
# Flat 0
# Resolution 0
# Event code 1 (ABS_Y)
# Value 0
# Min 0
# Max 1
# Fuzz 0
# Flat 0
# Resolution 0
# Event type 4 (EV_MSC)
# Event code 4 (MSC_SCAN)
# Properties:
N: HID 256c:006e Pad
I: 0003 256c 006e 0111
...
之后：
# EVEMU 1.3
# Kernel: 5.7.0-1-MANJARO
# DMI: dmi:bvnAmericanMegatrendsInc.:bvr1205:bd05/11/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ270-P:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
# Input device name: "HID 256c:006e Pad"
# Input device ID: bus 0x03 vendor 0x256c product 0x6e version 0x111
# Supported events:
# Event type 0 (EV_SYN)
# Event code 0 (SYN_REPORT)
# Event code 1 (SYN_CONFIG)
# Event code 2 (SYN_MT_REPORT)
# Event code 3 (SYN_DROPPED)
# Event code 4 ((null))
# Event code 5 ((null))
# Event code 6 ((null))
# Event code 7 ((null))
# Event code 8 ((null))
# Event code 9 ((null))
# Event code 10 ((null))
# Event code 11 ((null))
# Event code 12 ((null))
# Event code 13 ((null))
# Event code 14 ((null))
# Event code 15 (SYN_MAX)
# Event type 1 (EV_KEY)
# Event code 30 (KEY_A)
# Event code 256 (BTN_0)
# Event code 304 (BTN_SOUTH)
# Event code 305 (BTN_EAST)
# Event code 306 (BTN_C)
# Event code 331 (BTN_STYLUS)
# Event type 3 (EV_ABS)
# Event code 0 (ABS_X)
# Value 0
# Min 0
# Max 1
# Fuzz 0
# Flat 0
# Resolution 0
# Event code 1 (ABS_Y)
# Value 0
# Min 0
# Max 1
# Fuzz 0
# Flat 0
# Resolution 0
# Event type 4 (EV_MSC)
# Event code 4 (MSC_SCAN)
# Properties:
N: HID 256c:006e Pad
I: 0003 256c 006e 0111
...
尝试不同的设备
为了检查我是否做错了什么，我用 USB 鼠标尝试了非常类似的操作（我没有映射扫描代码 90001，因为这是左键单击）。我的鼠标被拿起xev，当我右键单击或滚动时，我得到了我所期望的字母“a”（因此，如果您在问题中看到任何杂散字母 a，这就是原因）。我比较了xev键盘和鼠标的输出：
KeyPress event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 4209087, (-1,721), root:(969,736),
state 0x0, keycode 38 (keysym 0x61, a), same_screen YES,
XLookupString gives 1 bytes: (61) "a"
XmbLookupString gives 1 bytes: (61) "a"
XFilterEvent returns: False
KeyRelease event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 4209151, (-1,721), root:(969,736),
state 0x0, keycode 38 (keysym 0x61, a), same_screen YES,
XLookupString gives 1 bytes: (61) "a"
XFilterEvent returns: False
MappingNotify event, serial 34, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 8, count 248
KeyPress event, serial 34, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 4211519, (-1,721), root:(969,736),
state 0x0, keycode 38 (keysym 0x61, a), same_screen YES,
XLookupString gives 1 bytes: (61) "a"
XmbLookupString gives 1 bytes: (61) "a"
XFilterEvent returns: False
KeyRelease event, serial 35, synthetic NO, window 0x3a00001,
root 0x6bd, subw 0x0, time 4211679, (-1,721), root:(969,736),
state 0x0, keycode 38 (keysym 0x61, a), same_screen YES,
XLookupString gives 1 bytes: (61) "a"
XFilterEvent returns: False
装置
有问题的平板电脑是我安装的“Huion New 1060Plus”，digimend-kernel-drivers-dkms-git我认为我的平板电脑正在使用 evdev 驱动程序（我没有安装替代的 wacom 驱动程序xf86-input-wacom，但我已经libwacom安装了，因为它由libinput和使用gnome-settings-daemon）。除了按钮的问题之外，平板电脑工作正常，包括笔压。
使用的指南
我主要遵循以下来源的指南：