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HID: wacom: Set a default resolution for older tablets

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commit 08a46b4190 upstream.

Some older tablets may not report physical maximum for X/Y
coordinates. Set a default to prevent undefined resolution.

Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Link: https://lore.kernel.org/r/20230409164229.29777-1-ping.cheng@wacom.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ping Cheng 2023-04-09 09:42:29 -07:00 • committed by Greg Kroah-Hartman
commit 77fd800d3f
1 changed files with 10 additions and 2 deletions
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12
drivers/hid/wacom_wac.c
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@ -1853,6 +1853,7 @@ 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);
if (equivalent_usage == HID_DG_TWIST) {
resolution_code = ABS_RZ;
@ -1875,8 +1876,15 @@ static void wacom_map_usage(struct input_dev *input, struct hid_usage *usage,
switch (type) {
case EV_ABS:
input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
input_abs_set_res(input, code,
hidinput_calc_abs_res(field, resolution_code));
/* older tablet may miss physical usage */
if ((code == ABS_X || code == ABS_Y) && !resolution) {
resolution = WACOM_INTUOS_RES;
hid_warn(input,
"Wacom usage (%d) missing resolution \n",
code);
}
input_abs_set_res(input, code, resolution);
break;
case EV_KEY:
input_set_capability(input, EV_KEY, code);