[PATCH libinput] touchpad: only pair internal trackpoint devices with internal touchpads

[Bill Spitzak]

On 04/14/2015 09:01 PM, Peter Hutterer wrote:
> Internal touchpads with trackpoints are either BUS_I8042 or BUS_I2C, but not
> BUS_USB. Lenovo sells external keyboards with a trackpoint built-in, make sure
> we don't pair that trackpoint with the internal touchpad.
> And likewise, the internal trackpoint should not be paired with e.g. a wacom
> touch device.
>
> Lenovo had one external device that has a trackpoint and a touchpad on an
> external keyboard. That device won't be covered with this patch, if we have a
> user we can re-consider.

Would checking if both devices are on the same bus (rather than not on 
the USB bus) work for the systems you have, and also cover this case?

(ie. use bus_tp == bus_trp instead of tp_is_internal && trp_is_internal)

Pardon me if I have no idea what I am talking about.