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authorJan Nikitenko <jan.nikitenko@gmail.com>2007-07-17 15:04:03 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 21:23:04 +0400
commitad241528c4919505afccb022acbab3eeb0db4d80 (patch)
treeec3a2a65707ca032eab973f98aa568ed007389f1 /include/linux/crc7.h
parentc06e677aed0c86480b01faa894967daa8aa3568a (diff)
downloadlinux-ad241528c4919505afccb022acbab3eeb0db4d80.tar.xz
CRC7 support
Add CRC7 routines, used for example in MMC over SPI communication. Kerneldoc updates [akpm@linux-foundation.org: fix funny mix of const and non-const] Signed-off-by: Jan Nikitenko <jan.nikitenko@gmail.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/crc7.h')
-rw-r--r--include/linux/crc7.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/crc7.h b/include/linux/crc7.h
new file mode 100644
index 000000000000..1786e772d5c6
--- /dev/null
+++ b/include/linux/crc7.h
@@ -0,0 +1,14 @@
+#ifndef _LINUX_CRC7_H
+#define _LINUX_CRC7_H
+#include <linux/types.h>
+
+extern const u8 crc7_syndrome_table[256];
+
+static inline u8 crc7_byte(u8 crc, u8 data)
+{
+ return crc7_syndrome_table[(crc << 1) ^ data];
+}
+
+extern u8 crc7(u8 crc, const u8 *buffer, size_t len);
+
+#endif