taglinefilesource code
LP_B68drivers/char/lp.coutb_p(lpchar, LP_B(minor));
LP_B91drivers/char/lp.coutb_p(lpchar, LP_B(minor));
LP_B443drivers/char/lp.coutb_p( LP_DUMMY, LP_B(offset));
LP_B446drivers/char/lp.ctestvalue = inb_p(LP_B(offset));
LP_B72include/linux/lp.h#define LP_S(minor)  inb_p(LP_B((minor)) + 1)  /* status port */