From: Christophe TORDEUX <christophe@xxxxxxxxxxx>
Apply the following change to the Sentelic touchpad driver:
report only the position of the first finger as absolute non-MT
coordinates, instead of reporting both fingers alternatively. Actual MT
events are unaffected.
Signed-off-by: Christophe TORDEUX <christophe@xxxxxxxxxxx>
----
This is a much simpler version of my patch. Basically, it makes little
sense to report both fingers alternatively, as long as it's non-MT
events. With this approach, storing coordinates of the previously
reported touch is not necessary. This patch is against kernel version
3.7. Works with a touchpad version STL3888_C0, very probably works on
all later version, and very probably does not impact any earlier
version. This patch has two effects:
1) fix horizontal and improve vertical scrolling, though maybe in a
coincidental way and 2) work towards making the non-MT absolute events
a purely legacy single finger fallback mode, without breaking anything.
diff -uprN -X vanilla/linux-3.7-rc8/Documentation/dontdiff vanilla/linux-3.7/drivers/input/mouse/sentelic.c linux-3.7/drivers/input/mouse/sentelic.c
--- vanilla/linux-3.7/drivers/input/mouse/sentelic.c 2012-12-15 13:51:58.768136524 +0100
+++ linux-3.7/drivers/input/mouse/sentelic.c 2012-12-19 23:26:49.289517251 +0100
@@ -791,7 +791,7 @@ static psmouse_ret_t fsp_process_byte(st
fsp_set_slot(dev, 0, fgrs > 0, abs_x, abs_y);
fsp_set_slot(dev, 1, false, 0, 0);
}
- if (fgrs > 0) {
+ if (fgrs ==1 || (fgrs == 2 && !(packet[0] & FSP_PB0_MFMC_FGR2))) {
input_report_abs(dev, ABS_X, abs_x);
input_report_abs(dev, ABS_Y, abs_y);
}
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