271 static u16 y_old[MAX_CONTACTS + 1] = {0};  variable
647 		y_old[id] = y;  in filter_point()
651 	y_err = y > y_old[id] ? (y - y_old[id]) : (y_old[id] - y);  in filter_point()
675 	y_new = y > y_old[id] ? (y_old[id] + filter_step_y) : (y_old[id] - filter_step_y);  in filter_point()
678 	y_old[id] = y_new;  in filter_point()
690 		y_old[id] = y;  in record_point()
694 	y = (y_old[id] + y) / 2;  in record_point()
701 	if (y > y_old[id])  in record_point()
702 		y_err = y - y_old[id];  in record_point()
704 		y_err = y_old[id] - y;  in record_point()
710 		y_old[id] = y;  in record_point()
720 			y_old[id] = y;  in record_point()
722 			y_new = y_old[id];  in record_point()
728 		y_new = y_old[id];  in record_point()