From: Mike Auty Date: Sun, 29 Aug 2010 03:35:17 +0000 (-0700) Subject: Input: wacom - fix mousewheel handling for old wacom tablets X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d9f66c1a46163c7c83411058516a69da547262f8;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git Input: wacom - fix mousewheel handling for old wacom tablets This fixes a regression introduced in 3b57ca0f80c5c8994b5b1e3d3f904cfe727951f2. 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 Reviewed-by: Ping Cheng Cc; stable@kernel.org Signed-off-by: Dmitry Torokhov --- diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c index 40d77ba8fdc1..6e29badb969e 100644 --- a/drivers/input/tablet/wacom_wac.c +++ b/drivers/input/tablet/wacom_wac.c @@ -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); }