Re: fs: layered device driver to write to evdev

[Christoph Hellwig]

On Wed, Nov 02, 2022 at 05:04:11PM -0700, Luis Chamberlain wrote:
> On Wed, Nov 02, 2022 at 02:14:24PM +0100, Guillermo Rodriguez Garcia wrote:
> > I understand that device drivers should implement ->write_iter if they
> > need to be written from kernel space, but evdev does not support this.
> > What is the recommended way to have a layered device driver that can
> > talk to evdev ?
> 
> Shouldn't just writing write_iter support make this work?

Writing to evdev just sound like a lot of troble.  evdev is a tiny
wrapper to expose the in-kernel input API to userspace.  Anything
in-kernel should just directly interact with the input subsystem.