bcd.h

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#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 */