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HID: wacom: Interpret tilt data from Intuos Pro BT as signed values

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The tilt data contained in the Bluetooth packets of an Intuos Pro are
supposed to be interpreted as signed values. Simply casting the values
to type `char` is not guaranteed to work since it is implementation-
defined whether it is signed or unsigned. At least one user has noticed
the data being reported incorrectly on their system. To ensure that the
data is interpreted properly, we specifically cast to `signed char`
instead.

Link: https://github.com/linuxwacom/input-wacom/issues/445
Fixes: 4922cd26f03c ("HID: wacom: Support 2nd-gen Intuos Pro's Bluetooth classic interface")
CC: stable@vger.kernel.org # 4.11+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Jason Gerecke 2024-10-28 10:39:14 -07:00 committed by Jiri Kosina
parent 177f25d129
commit 49a397ad24
1 changed files with 2 additions and 2 deletions
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4
drivers/hid/wacom_wac.c
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@ -1353,9 +1353,9 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
rotation -= 1800;
input_report_abs(pen_input, ABS_TILT_X,
(char)frame[7]);
(signed char)frame[7]);
input_report_abs(pen_input, ABS_TILT_Y,
(char)frame[8]);
(signed char)frame[8]);
input_report_abs(pen_input, ABS_Z, rotation);
input_report_abs(pen_input, ABS_WHEEL,
get_unaligned_le16(&frame[11]));