On 21/04/16 20:04, Neil Jerram wrote:
On 21/04/16 13:08, Neil Jerram wrote:
Has anyone tried configuring the GTA04 touchscreen to behave as a
touchpad instead of a touchscreen? Would the kernel code for the
touchscreen support that?
Subject to the latter, I think the former is possible in principle by
using libinput and configuring a udev rule like this:
ACTION=="add|change", KERNEL=="event[0-9]*", ENV{ID_VENDOR_ID}=="...",
ENV{ID_MODEL_ID}=="...b", ENV{ID_INPUT_TOUCHSCREEN}="",
ENV{ID_INPUT_TOUCHPAD}="1"
Well, unfortunately it does not work. Xorg.0.log says:
[ 19.473] (II) input device 'TSC2007 Touchscreen',
/dev/input/event0 is tagged by udev as: Touchpad Touchscreen
[ 19.473] (EE) kernel bug: device TSC2007 Touchscreen failed
touchpad sanity checks
[ 19.473] (II) input device 'TSC2007 Touchscreen',
/dev/input/event0 is a touchpad
[ 19.540] (II) failed to create input device '/dev/input/event0'.
I guess libinput is expecting some minimal characteristics for a
'touchpad', and the TSC2007 kernel driver doesn't provide those. Pity,
because I would like to see if it was usable that way.
Yes, libinput checks for ABS_X, BTN_TOUCH and BTN_TOOL_FINGER. The
driver provides ABS_X and BTN_TOUCH but not BTN_TOOL_FINGER.
It looks like a trivial change to get the driver to advertise
BTN_TOOL_FINGER, so I plan to try that next. If it works we could
implement a driver option for it, so as to allow either touchscreen or
touchpad use.
Regards,
Neil
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