Assume that if the pressure is given in newtons it should be normalized
to grams. If the pressure has no unit do not calculate resolution.
Signed-off-by: Angela Czubak <acz@xxxxxxxxxxxx>
---
drivers/hid/hid-input.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index c60cee4bb6aa6..151823ad29166 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -303,6 +303,19 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
}
break;
+ case ABS_PRESSURE:
+ case ABS_MT_PRESSURE:
+ if (field->unit == HID_UNIT_NEWTON) {
+ /* Convert to grams, 1 newton is 101.97 grams */
+ prev = physical_extents;
+ physical_extents *= 10197;
+ if (physical_extents < prev)
+ return 0;
+ unit_exponent -= 2;
+ } else if (field->unit != HID_UNIT_GRAM) {
+ return 0;
+ }
+ break;
default:
return 0;
}
--
2.38.0.rc1.362.ged0d419d3c-goog
