8000 Read from multiple inputs by IzumiRaine · Pull Request #596 · kmonad/kmonad · GitHub
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Read from multiple inputs #596

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Read from multiple inputs #596

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IzumiRaine
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Hacky implementation of multiple inputs on Linux.

My goal was to use extra buttons on my mouse to switch layers on my keyboard, so I needed a way to attach the same kmonad instance to two input devices. Unfortunately, it turns out the mouse pointer stops moving if I run kmonad on the mouse; so I abandonded the idea (I thought the keyboard and mouse parts would be different endpoints, but apparently not). Maybe this code can still be useful for somebody else as a starting point.

@jtroo
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jtroo commented Jul 23, 2022 •
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the mouse pointer stops moving if I run kmonad on the mouse

Without having looked into the code specifics, I think this is fixable by forwarding all received events that kmonad doesn't care to process to uinput.

There may be some extra code that needs to be added to uinput registration for the kernel to accept kmonad's forwarded mouse events, though I'm not sure about that.

@MuhammedZakir
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MuhammedZakir commented Jul 23, 2022 •
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the mouse pointer stops moving if I run kmonad on the mouse

Without having looked into the code specifics, I think this is fixable by forwarding all received events that kmonad doesn't care to process to uinput.

Yes.

There may be some extra code that needs to be added to uinput registration for the kernel to accept kmonad's forwarded mouse events, though I'm not sure about that.

If I understand correctly, in this line [1], changing 256 to 275[2] should allow sending events for commonly used mouse buttons.

Edit: You may also add EV_REL events. See https://www.kernel.org/doc/html/latest/input/uinput.html#mouse-movements. For the "keycodes", search for REL in the header file [2].

Edit-2: I don't know if we can create a virtual device that sends both mouse and keyboard events. The ones I have seen uses different virtual devices. Edit: I remember seeing somewhere about using seperate event devices for keyboard and mouse events to prevent X from recognizing the virtual device as mouse. I don't know why that would cause a problem though.

Edit-3: This maybe helpful: https://www.kernel.org/doc/html/latest/input/event-codes.html

[1]

kmonad/c_src/keyio.c

Line 21 in 95bb58b

for (i=0; i < 256; i++) {

[2] These are keycodes; see /usr/include/linux/input-event-codes.h.

@slotThe
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slotThe commented Aug 11, 2022

@IzumiRaine any updates on this?

@IzumiRaine
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Sorry, nothing yet. I'll take another look around October (will be a bit too busy before then). Feel free to close the PR meanwhile.

@Ninlives
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@IzumiRaine Hi, could you please present a small configuration example of how to use multiple inputs? Thanks!
8000

@jtroo jtroo mentioned this pull request Aug 20, 2022
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@IzumiRaine
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@Ninlives sure. You can add multiple paths to device-file like this:

(defcfg
  input  (device-file "/dev/input/by-id/keyboard1" "/dev/input/by-id/keyboard2")
  output (uinput-sink "My KMonad output" "")
)

But please keep in mind that so far this is just a quick hack and only for Linux.

@stevep99
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stevep99 commented Apr 26, 2024 •
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+1 on this feature.

It would be nice as well if you could specify "*" as the input device, and then it would match all attached keyboard devices.

@jokesper jokesper mentioned this pull request Sep 25, 2024
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@jokesper jokesper mentioned this pull request Mar 17, 2025
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6 participants
@IzumiRaine @jtroo @MuhammedZakir @slotThe @Ninlives @stevep99
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