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The new machconfig probes USB keyboard and touch screen, and
then sets HAVE_* variables according to detection.
Detectable devices:
USB HID keyboards (Generic Desktop)
USB HID touch screens (Digitizer)
Note:
The intention is to have a way to provide initial formfactor
settings in a boot procedure. That means supported keyboard
and touch screen must be connected before machconfig runs.
Any new connection or disconnection won't be detected until
machconfig is executed again.
Limitation:
There could be some USB HID devices presents more than one
usage in a single descriptor. We will add support once such
device emerges.
Some platforms may have _virtual_ devices provided by BIOS.
It will cause false detection when they are presented as
types we supported. We can add black list logic when it
becomes a big concern.
Fixes [YOCTO #9205]
Signed-off-by: Jianxun Zhang <jianxun.zhang@linux.intel.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
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