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HID: input: calculate resolution for pressure

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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 <aczubak@google.com>
Co-developed-by: Jonathan Denose <jdenose@google.com>
Signed-off-by: Jonathan Denose <jdenose@google.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Angela Czubak
2025-08-18 23:08:48 +00:00
committed by Benjamin Tissoires
parent 344ff35849
commit 7657bf0b7c
1 changed files with 13 additions and 0 deletions
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13
drivers/hid/hid-input.c
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@@ -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;
}