[OE-core] [PATCH] udev: generalize the check in touchscreen rule

[Andrea Adami]

As far as I understand that, the rule was originally written for corgi
touchscreen and did indeed work for ads7846 ts.

Then something went wrong and this patch appeared: "udev 124: support
devices with ads7846 touchscreen and wrong modalias"

http://lists.linuxtogo.org/pipermail/openembedded-commits/2009-January/022948.html

Finally, bluelightning reported that on ipaq h1940 the rule did not
match and added a .bbappend in meta-handheld.

I analyzed the output of the touchscreen I have (Zaurus poodle, corgi,
spitz) and the generic rule still matched fine, because sysfs reports
18 (pressure).

Now, looking at the s3c2410_ts.c driver on that ipaq, it seems to me
it only reports:

125                         input_report_abs(ts.input, ABS_X, ts.xp);
126                         input_report_abs(ts.input, ABS_Y, ts.yp);
127
128                         input_report_key(ts.input, BTN_TOUCH, 1);
129                         input_sync(ts.input);


but not pressure.

In fact, ABS_X and ABS_Y are reported, there are no relative axes,
there is no pressure.
That should be enough to classify it as touchscreen imho.

Regards

Andrea