Re: [PATCH] hid-ntrig.c Multitouch cleanup and fix

[Henrik Rydberg <rydberg@euromail.se>]

Mohamed Ikbel Boulabiar wrote:

> The hierarchy applied on multitouch isn't the best example to prove
> benefits of it.
> Hierarchy is useful with some complex input devices that have many
> axes, many buttons some accelerometers, but that are hierarchical from
> the source (integrality/separability ?).
> Then providing them as hierarchy can be useful.

I believe I see your's and Stephane's point. But while you argue about how to
get the devices to userspace in a clean fashion, I argue about how to process
arbitrary collection of devices in a clean fashion, once they get there.

> The solution maybe to have other handlers to show virtual hierarchical
> devices in another virtual devices folder in addition to the old way.
> The handler read from the usual device file and provide other sources.
> 
> Kernel modules will be then simple providing necessary input. And
> complex handling will be in an additional layer.
> User then will chose from where read the input : the old way or the
> dynamic with handler special ways.

I still have a feeling that the most workable, generic structure to impose on
input devices in general, is the empty set.

> It should not also be in X.
> If things aren't in the kernel, they shouldn't so be in X by obligation.

I completely agree -- the recent movement around xorg input, hal and udev
clearly shows how badly input needs its own layer.

Henrik