ti_am335x_tsc.c driver

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Hello all,

The TI touch screen driver does not work _right_ with the libts-bin package
in the jessie image.

$ cat /etc/dogtag
BeagleBoard.org Debian Image 2018-01-01

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 8.10 (jessie)
Release:        8.10
Codename:       jessie

$ dpkg -l | grep  libts-bin
ii  libts-bin                             1.14-1rcnee0~jessie+20171122
                      armhf        touch screen library utilities

$ sudo ts_calibrate
ts_setup: No such file or directory

It is possible to make it work by setting the TSLIB_TSDEVICE environment
variable:

$ sudo su
# export TSLIB_TSDEVICE=/dev/input/event2
# ts_calibrate

But, that's a bit of a pain since the environment variable always needs to
be set in order to use the touchscreen.

It appears that this version of the utilities uses the INPUT_PROP_DIRECT
propbit to automatically detect which /dev/input/event device is the
touchscreen.

It looks like the following is the only change needed to make it work.

Unfortunately, I don't have currently have a way to build a custom kernel
for the BeagleBone in order to test it. If there is anyone that could I
would
appreciate it.

Regards,
Hartley