[kbd] add keymap loading for event devices

[kbd] add keymap loading for event devices

[Hannes Winkler]

Good morning,

there's currently no way to easily apply a keymap (given as a keymap 
file) to an event device.

What do you think about adding such a feature to loadkeys? That'd also 
enable udev to easily apply the system keymap to hotplugged event devices.

Keymaps are practically the only thing evdevs keep as global state 
(everything else on a per-fd basis), so you don't need to apply the 
keymap every time you open an evdev. It's sufficient to apply the keymap 
to the evdev once, when it's plugged in - loadkeys would be perfect for 
this.

I'd be willing to contribute if you agree to add this feature to loadkeys.

Best regards,
Hannes Winkler

Re: [kbd] add keymap loading for event devices

[Alexey Gladkov]

On Wed, Jan 15, 2020 at 10:14:29AM +0100, Hannes Winkler wrote:
> Good morning,
> 
> there's currently no way to easily apply a keymap (given as a keymap file)
> to an event device.

I'm not sure that I understand what kind of devices you are talking about.
Can you explain more ?

> What do you think about adding such a feature to loadkeys? That'd also
> enable udev to easily apply the system keymap to hotplugged event devices.

Yes. If it will be useful.

> Keymaps are practically the only thing evdevs keep as global state
> (everything else on a per-fd basis), so you don't need to apply the keymap
> every time you open an evdev. It's sufficient to apply the keymap to the
> evdev once, when it's plugged in - loadkeys would be perfect for this.
> 
> I'd be willing to contribute if you agree to add this feature to loadkeys.

Patches are welcome :)

-- 
Rgrds, legion