Re: event mixer patch

[James S. <jsi...@tr...>]

> > Is this a seperate patch or the patch from Charles? I looked at his patch
> > and it has only one line change in input.c. Very nice patch. After I'm
> > done with power management today I will incorporate it. Probable some
> > time tomorrow unless Vojtech has any objections.
> 
> Last time I asked Vojtech wasn't very pleased of that idea, eg. it doesn't 
> make  much sense to mix in EV_ABS devices.

Your right. I have this problem with a userland program I wrote. The way
I got around that was to emulate each absolute device as a relative
device. 

> Maybe it should be a separate module providing a whole class of event mix 
> devices, with all EV_KEY and EV_REL mixed on /dev/eventmix0 by default. Then 
> there could be ioctl's to attach and detach single event devices onto the 
> mixer devices.

The real underlying problem is knowing when a device gets attached and
detached. How do we know that? It is not easy to solve. A mixer sort of
gets around this problem. Then we run into the problem of EV_ABS type
devices. The mixer device could be used to tell us when a new device is
added or subtracted. Then we can decided to add the new device to the
mixer.