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lib: add crc7 from Linux

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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>
This commit is contained in:
Thomas Chou
2011-01-11 09:38:20 +08:00
committed by Wolfgang Denk
parent 5c4fa2eea0
commit ed6ce67a2c
3 changed files with 77 additions and 0 deletions
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14
include/linux/crc7.h Normal file
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@@ -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