path: root/lib/bcd.c
diff options
authorDavid Brownell <david-b@pacbell.net>2008-07-23 21:30:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:33 -0700
commitd3de851a445123f24ad8ece18662014b5e8a8b4e (patch)
tree44ef8b43208ba8a071fcd4d4b22e76c55881836d /lib/bcd.c
parent53e84b672c1a8190af2b376c35c7a39cf1214f59 (diff)
rtc: BCD codeshrink
This updates <linux/bcd.h> 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 <dbrownell@users.sourceforge.net> Acked-by: Adrian Bunk <bunk@kernel.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bcd.c')
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/bcd.c b/lib/bcd.c
new file mode 100644
index 00000000000..d74257fd0fe
--- /dev/null
+++ b/lib/bcd.c
@@ -0,0 +1,14 @@
+#include <linux/bcd.h>
+#include <linux/module.h>
+unsigned bcd2bin(unsigned char val)
+ return (val & 0x0f) + (val >> 4) * 10;
+unsigned char bin2bcd(unsigned val)
+ return ((val / 10) << 4) + val % 10;