Commit ccdd6994 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina

HID: round return value of hidinput_calc_abs_res

hidinput_calc_abs_res should return the closest int in the division
instead of the floor.
On a device with a logical_max of 3008 and a physical_max of 255mm,
previous implementation gave a resolution of 11 instead of 12.
With 11, user-space computes a physical size of 273.5mm and the
round_closest results gives 250.6mm.
The old implementation introduced an error of 2cm in this example.
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@gmail.com>
Acked-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 37cf6e6f
......@@ -287,7 +287,7 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
}
/* Calculate resolution */
return logical_extents / physical_extents;
return DIV_ROUND_CLOSEST(logical_extents, physical_extents);
}
EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);
......
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