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| author |   Andrew Morton <akpm@linux-foundation.org> | 2018-01-03 15:39:58 -0800 |
|---|---|---|
| committer |   Lee Jones <lee.jones@linaro.org> | 2018-01-08 10:08:33 +0000 |
| commit | 0d85adb5fbd33daf81276d6fa0f990136eb4bf29 (patch) | |
| tree | 541146ecdafb75f21305838862cecb03194d27e8 /include/linux/crc-ccitt.h | |
| parent | Linux 4.15-rc1 (diff) | |
| download | linux-dev-0d85adb5fbd33daf81276d6fa0f990136eb4bf29.tar.xz linux-dev-0d85adb5fbd33daf81276d6fa0f990136eb4bf29.zip | |
lib/crc-ccitt: Add CCITT-FALSE CRC16 variant
In support of a soon to be published MFD driver using serdev to talk to
a supervisory processor that uses the CCITT-FALSE CRC16 variant in it's
protocol, this patch was tested successfully on an i.MX6 ARM platform.
Link: http://lkml.kernel.org/r/20170413142932.27287-1-andrew.smirnov@gmail.com
Signed-off-by: Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'include/linux/crc-ccitt.h')
| -rw-r--r-- | include/linux/crc-ccitt.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/crc-ccitt.h b/include/linux/crc-ccitt.h index cd4f420231ba..72c92c396bb8 100644 --- a/include/linux/crc-ccitt.h +++ b/include/linux/crc-ccitt.h @@ -5,12 +5,19 @@ #include <linux/types.h> extern u16 const crc_ccitt_table[256]; +extern u16 const crc_ccitt_false_table[256]; extern u16 crc_ccitt(u16 crc, const u8 *buffer, size_t len); +extern u16 crc_ccitt_false(u16 crc, const u8 *buffer, size_t len); static inline u16 crc_ccitt_byte(u16 crc, const u8 c) { return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff]; } +static inline u16 crc_ccitt_false_byte(u16 crc, const u8 c) +{ + return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c]; +} + #endif /* _LINUX_CRC_CCITT_H */ |