CS_IRQ_STATUS
reg = ce4231_read(sc, CS_IRQ_STATUS);
ce4231_write(sc, CS_IRQ_STATUS, reg & ~CS_IRQ_PI);
reg = ce4231_read(sc, CS_IRQ_STATUS);
ce4231_write(sc, CS_IRQ_STATUS, reg & ~CS_IRQ_CI);
ad_write(sc, CS_IRQ_STATUS, 0);
status = ad_read(sc, CS_IRQ_STATUS);
reg = cs4231_read(sc, CS_IRQ_STATUS);