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HID: wacom: Properly report negative values from Intuos Pro 2 Bluetooth

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The wacom driver's IRQ handler for Bluetooth reports from the 2nd-gen
Intuos Pro does not correctly process negative numbers. Values for
tilt and rotation (which can go negative) are instead interpreted as
unsigned and so jump to very large values when the data should be
negative. This commit properly casts the data to ensure we report
negative numbers when necessary.

Fixes: 4922cd2 ("HID: wacom: Support 2nd-gen Intuos Pro's Bluetooth classic interface")
Cc: stable@vger.kernel.org # v4.11
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2017-08-30 15:13:25 -07:00 committed by Jiri Kosina
parent e57f4e67a0
commit b63c4c2718
1 changed files with 3 additions and 3 deletions
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6
drivers/hid/wacom_wac.c
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@ -1229,9 +1229,9 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
if (range) {
input_report_abs(pen_input, ABS_X, get_unaligned_le16(&frame[1]));
input_report_abs(pen_input, ABS_Y, get_unaligned_le16(&frame[3]));
input_report_abs(pen_input, ABS_TILT_X, frame[7]);
input_report_abs(pen_input, ABS_TILT_Y, frame[8]);
input_report_abs(pen_input, ABS_Z, get_unaligned_le16(&frame[9]));
input_report_abs(pen_input, ABS_TILT_X, (char)frame[7]);
input_report_abs(pen_input, ABS_TILT_Y, (char)frame[8]);
input_report_abs(pen_input, ABS_Z, (int16_t)get_unaligned_le16(&frame[9]));
input_report_abs(pen_input, ABS_WHEEL, get_unaligned_le16(&frame[11]));
}
input_report_abs(pen_input, ABS_PRESSURE, get_unaligned_le16(&frame[5]));