On Wed, 7 Nov 2012, Benjamin Tissoires wrote: > 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: Benjamin Tissoires <[email protected]>
Acked-by: Jiri Kosina <[email protected]> > --- > drivers/hid/hid-input.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c > index f5b1d57..67044f3 100644 > --- a/drivers/hid/hid-input.c > +++ b/drivers/hid/hid-input.c > @@ -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); > > -- > 1.7.11.7 > -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
