[RFC v3 wayland-protocols] inputfd - direct input access protocol

[Scott Anderson]

Hi,

I thought I would try to push this [1] protocol along, as it's what 
would be needed for wayland client gamepad input. There is still no 
client-side "libgamepadinput", so clients are on their own when it comes 
to handling these devices.

Here is a basic proof-of-concept implementation for weston:
https://gitlab.freedesktop.org/ascent/weston/tree/inputfd

It's a little rough around the edges, and a more complete implementation 
would add some configurability. It just gives every device to whichever 
client has the keyboard focus.

There is a very basic test client which just reports which devices it 
receives, but doesn't currently do anything else with them.

The only oddity I noticed was there is a 'serial' argument to 
zwp_inputfd_device_evdev_v1.focus_in which has no description and 
doesn't seem to serve any purpose. A follow up version of this protocol 
should remove that.

Scott

[1] 
https://lists.freedesktop.org/archives/wayland-devel/2017-August/034828.html