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Input: wacom - fix mousewheel handling for old wacom tablets 

This fixes a regression introduced in
3b57ca0f80.

The data[6] byte contains either 1 or -1 depending on the whether the
mouse wheel on older wacom tablets is moved down (1) or up (-1).  The
patch introduced in the above commit changed the cast from (signed char)
to (signed).  When cast as a signed integer and negated, the value of -1
(stored in the byte as 0xff) became -255 rather than 1.  This patch
reverts the cast to a (signed char) and also removes an unnecessary
(signed) cast, as all the values operated on are bitmasked.

Signed-off-by: Mike Auty <ikelos@gentoo.org>
Reviewed-by: Ping Cheng <pingc@wacom.com>
Cc; stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Mike Auty 2010-08-28 20:35:17 -07:00 committed by Dmitry Torokhov
parent 288933c02b
commit d9f66c1a46
1 changed files with 2 additions and 2 deletions
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4
drivers/input/tablet/wacom_wac.c
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@ -243,10 +243,10 @@ static int wacom_graphire_irq(struct wacom_wac *wacom)
if (features->type == WACOM_G4 ||
features->type == WACOM_MO) {
input_report_abs(input, ABS_DISTANCE, data[6] & 0x3f);
rw = (signed)(data[7] & 0x04) - (data[7] & 0x03);
rw = (data[7] & 0x04) - (data[7] & 0x03);
} else {
input_report_abs(input, ABS_DISTANCE, data[7] & 0x3f);
rw = -(signed)data[6];
rw = -(signed char)data[6];
}
input_report_rel(input, REL_WHEEL, rw);
}