[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