SAA7134_FM_DEMATRIX
saa_writeb(SAA7134_FM_DEMATRIX, 0x80);
saa_writeb(SAA7134_FM_DEMATRIX, 0x80);
saa_writeb(SAA7134_FM_DEMATRIX, reg);
saa_writeb(SAA7134_FM_DEMATRIX, 0x80);