LS2K_KCS_STS_IBF
writeb(sts | LS2K_KCS_STS_IBF, addr + LS2K_KCS_REG_STS);
#define LS2K_KCS_DATA_MASK (LS2K_KCS_STS_OBF | LS2K_KCS_STS_IBF | LS2K_KCS_STS_CMD)
| FIELD_PREP(LS2K_KCS_STS_IBF, ibf)
if (sts & LS2K_KCS_STS_IBF)