u8 w1_calc_crc8(u8 *, int);
void w1_write_block(struct w1_master *, u8 *, int);
u8 w1_read_block(struct w1_master *, u8 *, int);
u8 w1_calc_crc8(u8 *, int);
void w1_write_block(struct w1_master *, u8 *, int);
u8 w1_read_block(struct w1_master *, u8 *, int);