The main goal of this paper is to construct the Hannay-Berry model of quantum
mechanics, on a two dimensional symplectic torus. We construct a simultaneous
quantization of the algebra of functions and the linear symplectic group $\G =$
SL$_2 (\Z)$. We obtain the quantization via an action of $\G$ on the set of
equivalence classes of irreducible representations of Rieffel`s quantum torus
$\Ad$. For $\h \in \Q$ this action has a unique fixed point. This gives a
canonical projective equivariant quantization. There exists a Hilbert space on
which both $\G$ and $\Ad$ act equivariantly. Combined with the fact that every
projective representation of $\G$ can be lifted to a linear representation, we
also obtain linear equivariant quantization.