rt2560_bbp_read
static uint8_t rt2560_bbp_read(struct rt2560_softc *, uint8_t);
tmp = rt2560_bbp_read(sc, 70);
if (rt2560_bbp_read(sc, RT2560_BBP_VERSION) != 0)
tx = rt2560_bbp_read(sc, RT2560_BBP_TX) & ~RT2560_BBP_ANTMASK;
rx = rt2560_bbp_read(sc, RT2560_BBP_RX) & ~RT2560_BBP_ANTMASK;