#include <linux/bcd.h>
  #include <linux/module.h>
  
  unsigned bcd2bin(unsigned char val)
  {
  	return (val & 0x0f) + (val >> 4) * 10;
  }
  EXPORT_SYMBOL(bcd2bin);
  
  unsigned char bin2bcd(unsigned val)
  {
  	return ((val / 10) << 4) + val % 10;
  }
  EXPORT_SYMBOL(bin2bcd);