Neonode low-level access

[Paul Fox]

bert wrote:
 > How can I get at low-level data from the XO-4's touch screen in
 > Linux?  I'm thinking of the actual light levels of all the sensors
 > around the edges.

access to more data is limited.  the only events we get correlate pretty
directly to the X events you already see -- i.e., motion and touch.

it's possible to request other data, and i think all of those requests
can be issued from either OFW or linux.

for OFW, see http://wiki.laptop.org/go/XO_4_Touch_Testing for the
watch-fss and watch-fll commands.  i think there are more as well, but
you're mainly interested in linux access.  for linux, see the sysfs
files under /sys/kernel/debug/zforce/.  there are also a few tuneables
under /sys/modules/zforce/parameters.  most are self-explanatory, or
are quickly explained by a glance at the driver.

the driver's header file contains pretty much all the original information
from the docs we got:
    http://dev.laptop.org/git/olpc-kernel/tree/drivers/input/touchscreen/zforce.h?h=arm-3.5

 > 
 > Certain apps could benefit from this - e.g. many of Neonode's own
 > impressive demos could not be implemented using only the X11 events
 > I get in Sugar.

can you elaborate?

paul
=---------------------
 paul fox, pgf at laptop.org