NM_INT_REG
snd_nm256_writew(chip, NM_INT_REG, 0x8000);
#define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
status = snd_nm256_readl(chip, NM_INT_REG);
#define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
status = snd_nm256_readw(chip, NM_INT_REG);