_HDAC_ISDCTL
#define HDAC_ISDCTL(sc, n) (_HDAC_ISDCTL((n), (sc)->num_iss, (sc)->num_oss))
[_HDAC_ISDCTL(n, iss, oss)] = hda_set_sdctl, \
[_HDAC_ISDCTL(n, iss, oss) + 2] = hda_set_sdctl2, \