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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2018-03-26 06:12:31 -0700 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-04-03 09:07:52 +0200 |
| commit | 37ebcf9984b0f6fe6282a433f8640894c3b9cdda (patch) | |
| tree | 6d7a88236048fe805687f8b59640776274ab8471 /include/linux/crc-ccitt.h | |
| parent | e96dc23280c43dd6b026ea71bcbaf3353abb4c83 (diff) | |
| download | barebox-37ebcf9984b0f6fe6282a433f8640894c3b9cdda.tar.gz barebox-37ebcf9984b0f6fe6282a433f8640894c3b9cdda.tar.xz | |
lib: Port CRC-CCITT functions from Linux kernel
Port CRC-CCITT implemenation in order to support porting MFD driver
for RAVE SP.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/linux/crc-ccitt.h')
| -rw-r--r-- | include/linux/crc-ccitt.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/crc-ccitt.h b/include/linux/crc-ccitt.h new file mode 100644 index 0000000000..72c92c396b --- /dev/null +++ b/include/linux/crc-ccitt.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_CRC_CCITT_H +#define _LINUX_CRC_CCITT_H + +#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 */ |