From: Jason Gerecke jason.gerecke@wacom.com

The Wacom driver maps the HID_DG_TWIST usage to ABS_Z (rather than ABS_RZ) for historic reasons. When the code to support twist was introduced in commit 50066a042da5 ("HID: wacom: generic: Add support for height, tilt, and twist usages"), we were careful to write it in such a way that it had HID calculate the resolution of the twist axis assuming ABS_RZ instead (so that we would get correct angular behavior). This was broken with the introduction of commit 08a46b4190d3 ("HID: wacom: Set a default resolution for older tablets"), which moved the resolution calculation to occur *before* the adjustment from ABS_Z to ABS_RZ occurred.

This commit moves the calculation of resolution after the point that we are finished setting things up for its proper use.

Signed-off-by: Jason Gerecke jason.gerecke@wacom.com Fixes: 08a46b4190d3 ("HID: wacom: Set a default resolution for older tablets") Cc: stable@vger.kernel.org --- drivers/hid/wacom_wac.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 1f4564982b958..2541fa2e0fa3b 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1878,12 +1878,14 @@ static void wacom_map_usage(struct input_dev *input, struct hid_usage *usage, int fmax = field->logical_maximum; unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid); int resolution_code = code; - int resolution = hidinput_calc_abs_res(field, resolution_code); + int resolution;

if (equivalent_usage == HID_DG_TWIST) { resolution_code = ABS_RZ; }

+ resolution = hidinput_calc_abs_res(field, resolution_code); + if (equivalent_usage == HID_GD_X) { fmin += features->offset_left; fmax -= features->offset_right;