SMCM_RX
clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
clrbits8(&smcp->smc_smcm, SMCM_RX);
if (events & SMCM_RX)
clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
setbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
clrbits8(&smcp->smc_smcm, SMCM_RX | SMCM_TX);
clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);