From ed6ce67a2c7071cf5032848caa8bbf037e5ac51b Mon Sep 17 00:00:00 2001
From: Thomas Chou <thomas@wytron.com.tw>
Date: Tue, 11 Jan 2011 09:38:20 +0800
Subject: lib: add crc7 from Linux

Crc7 is used to compute mmc spi command packet checksum.

Copy from linux-2.6 lib/crc7.c include/linux/crc7.h
commit ad241528c4919505afccb022acbab3eeb0db4d80

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
---
 include/linux/crc7.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 include/linux/crc7.h

(limited to 'include/linux')

diff --git a/include/linux/crc7.h b/include/linux/crc7.h
new file mode 100644
index 0000000..1786e77
--- /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
-- 
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