CFIG2I
IW_WRITE_CODEC_1(CFIG2I, 0x80); /* full voltage range, enable record
IW_READ_CODEC_1(CFIG2I, reg);
IW_WRITE_CODEC_1(CFIG2I, reg & ~(io << 4));
IW_READ_CODEC_1(CFIG2I, reg);
IW_WRITE_CODEC_1(CFIG2I, (reg | (io << 4)));