On 21/04/16 14:09, H. Nikolaus Schaller wrote:
Hi Neil,
Am 21.04.2016 um 14:08 schrieb Neil Jerram <[email protected]>:
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"
(following
https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html)
Also has anyone tried using an external input device instead of the
touchscreen?
Not really, but using an OTG cable and an USB mouse should work out of
the box. I think it does not even need special udev rules, although I have
never tried.
Yes, agreed. But a bit messy to have that cable hanging off the phone.
Hence my interest either in bluetooth, or in a creative way of using the
touchscreen that we already have.
A bluetooth mouse should also work.
Yes, but in general I think the term 'mouse' implies needing a surface
for the mouse to sit on - so not suitable for use when walking around.
But: it might differ how user space software uses the touch. If it uses tslib
the device name is usually hard-coded in some config.
But I believe tslib is obsolete now; I'm interested in a system using
cutting edge Linux.
X11 will simply
allow to move the cursor by any touch(screen/pad) device (but also depends
on xorg.conf overrides).
Sure, yes. But note the interesting difference between touchscreen and
touchpads, which has prompted my question at the start of this thread.
Touchscreen behaviour is that a touch on the screen generates a warp to
that position followed by an immediate Button1 click. Touchpad
behaviour is that
- a drag on the screen will move the pointer by an amount proportional
to the drag (but not _to_ the position where the finger ends)
- a hard enough 'tap' will generate a Button1 click.
So at the moment I'm wondering if touchpad behaviour might work more
conveniently for me on the GTA04 than touchscreen.
Regards,
Neil
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