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d3de851a4 rtc: BCD codeshrink ... Browse Code »

This updates to define the key routines as constant
functions, which the macros will then call. Newer code can now call
bcd2bin() instead of SCREAMING BCD2BIN() TO THE FOUR WINDS.

This lets each driver shrink their codespace by using N function calls to
a single (global) copy of those routines, instead of N inlined copies of
these functions per driver.

These routines aren't used in speed-critical code. Almost all callers are
in the RTC framework. Typical per-driver savings is near 300 bytes.

Signed-off-by: David Brownell
Acked-by: Adrian Bunk
Cc: Alessandro Zummo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds

David Brownell
2008-07-25 01:47:33 +0800

bcd.c 257 Bytes

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#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);