#ifndef _BCD_H
  #define _BCD_H

  #include <linux/compiler.h>

  #define bcd2bin(x)					\
  		(__builtin_constant_p((u8 )(x)) ?	\
  		const_bcd2bin(x) :			\
  		_bcd2bin(x))
  
  #define bin2bcd(x)					\
  		(__builtin_constant_p((u8 )(x)) ?	\
  		const_bin2bcd(x) :			\
  		_bin2bcd(x))
  
  #define const_bcd2bin(x)	(((x) & 0x0f) + ((x) >> 4) * 10)
  #define const_bin2bcd(x)	((((x) / 10) << 4) + (x) % 10)
  
  unsigned _bcd2bin(unsigned char val) __attribute_const__;
  unsigned char _bin2bcd(unsigned val) __attribute_const__;

  #endif /* _BCD_H */