extern int i2c_writereg(struct av7110 *av7110, u8 id, u8 reg, u8 val);
extern u8 i2c_readreg(struct av7110 *av7110, u8 id, u8 reg);
extern int msp_writereg(struct av7110 *av7110, u8 dev, u16 reg, u16 val);
extern int i2c_writereg(struct av7110 *av7110, u8 id, u8 reg, u8 val);
extern u8 i2c_readreg(struct av7110 *av7110, u8 id, u8 reg);
extern int msp_writereg(struct av7110 *av7110, u8 dev, u16 reg, u16 val);