HW_TESTLOOP
ret = fc->isac.ctrl(&fc->isac, HW_TESTLOOP, cq->channel);
ret = ipac->ctrl(ipac, HW_TESTLOOP, cq->channel);
case HW_TESTLOOP:
ret = card->isac.ctrl(&card->isac, HW_TESTLOOP, cq->channel);
ret = sf->isac.ctrl(&sf->isac, HW_TESTLOOP, cq->channel);