include/linux/bcd.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCD_H
   3 #define _BCD_H
   4
   5 #include <linux/compiler.h>
   6
   7 #define bcd2bin(x)                                      \
   8                 (__builtin_constant_p((u8 )(x)) ?       \
   9                 const_bcd2bin(x) :                      \
  10                 _bcd2bin(x))
  11
  12 #define bin2bcd(x)                                      \
  13                 (__builtin_constant_p((u8 )(x)) ?       \
  14                 const_bin2bcd(x) :                      \
  15                 _bin2bcd(x))
  16
  17 #define bcd_is_valid(x)                                 \
  18                 const_bcd_is_valid(x)
  19
  20 #define const_bcd2bin(x)        (((x) & 0x0f) + ((x) >> 4) * 10)
  21 #define const_bin2bcd(x)        ((((x) / 10) << 4) + (x) % 10)
  22 #define const_bcd_is_valid(x)   (((x) & 0x0f) < 10 && ((x) >> 4) < 10)
  23
  24 unsigned _bcd2bin(unsigned char val) __attribute_const__;
  25 unsigned char _bin2bcd(unsigned val) __attribute_const__;
  26
  27 #endif /* _BCD_H */