tree e433748561def86a9568b3adb988b5a187e79ee5
parent 4eb6f91b95e7618eae0103b6cba7c7f01f9d40f3
author Vadim Zaliva <lord@crocodile.org> 1268293260 -0800
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> 1268294456 -0800

Input: appletouch - fix integer overflow issue

When reading data from Geyser 2 touchpads used on post Oct 2005 Apple
PowerBooks the driver was casting X and Y coordinates values to
'signed char'. Testing on one of such PowerBooks I have noticed that
touchpad always generates positive values, but some of them are greater
that 127, and thus, when cast to 'signed char' being interpreted as
a negative.

Such bigger values have been observed infrequently, closer to the
edges of a touchpad, so the problem was not very visible.
Nevertheless, the patch would potentially improve touchpad
driver accuracy.

Signed-off-by: Vadim Zaliva <lord@crocodile.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>