multi-touch-dev team mailing list archive

["Henrik Rydberg" <rydberg@xxxxxxxxxxx>]

On Fri, Apr 22, 2011 at 10:10:32AM +0200, Paolo Olivo wrote:
> Hello everyone,
> 
> I am developing a mt toolkit, which I would like to interface to
> libmtdev. I am using a Dell XT2 and a 3M M2256PW touchscreen on Ubuntu
> 10.10, kernel 2.6.35-28-generic, libmtdev1.1.0.
> 
> I started capturing mtdev events, but I found something weird. I don't
> know if they are bugs or it is simply my misunderstanding.
> 
> First, using function "mtdev_has_mt_event" on the XT2 and passing
> ABS_MT_SLOT and ABS_MT_TRACKING_ID, in both cases it returns 0, while
> I actually receive ABS_MT_SLOT and ABS_MT_TRACKING_ID events using
> "mtdev_get". 3M is working fine.

The XT2 is using MT protocol type A, and mtdev is emulating the slot
and tracking values. The mtdev does not alter the actual kernel
device, therefore mtdev_has_mt_event() returns false for the XT2.

Cheers,
Henrik