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HID: wacom: Defer calculation of resolution until resolution_code is known

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commit 1b8f9c1fb464968a5b18d3acc1da8c00bad24fad upstream.

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
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Gerecke 2024-07-30 08:51:55 -07:00 • committed by Ksawlii
parent 316cf92368
commit 137cdee6a0
1 changed files with 3 additions and 1 deletions
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4
drivers/hid/wacom_wac.c
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@ -1920,12 +1920,14 @@ 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;