1 /*
2 * crc7.c
3 *
4 * This source code is licensed under the GNU General Public License,
5 * Version 2. See the file COPYING for more details.
6 */
7
8 #include <linux/types.h>
9 #include <linux/crc7.h>
10
11
12 /* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
13 const u8 crc7_syndrome_table[256] = {
14 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
15 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
16 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
17 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
18 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
19 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
20 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
21 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
22 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
23 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
24 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
25 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
26 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
27 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
28 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
29 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
30 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
31 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
32 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
33 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
34 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
35 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
36 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
37 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
38 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
39 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
40 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
41 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
42 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
43 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
44 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
45 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
46 };
47
48 /**
49 * crc7 - update the CRC7 for the data buffer
50 * @crc: previous CRC7 value
51 * @buffer: data pointer
52 * @len: number of bytes in the buffer
53 * Context: any
54 *
55 * Returns the updated CRC7 value.
56 */
crc7(u8 crc,const u8 * buffer,size_t len)57 u8 crc7(u8 crc, const u8 *buffer, size_t len)
58 {
59 while (len--)
60 crc = crc7_byte(crc, *buffer++);
61 return crc;
62 }
63