extern void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg);
extern int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for);
extern int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
extern void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg);
extern int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for);
extern int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,