REVISON_BITS
lp->chip_type = rev_type & ~REVISON_BITS;
lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
lp->chip_type = rev_type &~ REVISON_BITS;
lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';