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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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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/module.h> |
10 | #include <linux/crc7.h> |
11 | |
12 | |
13 | /* Table for CRC-7 (polynomial x^7 + x^3 + 1) */ |
14 | const u8 crc7_syndrome_table[256] = { |
15 | 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, |
16 | 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, |
17 | 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26, |
18 | 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e, |
19 | 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d, |
20 | 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45, |
21 | 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14, |
22 | 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c, |
23 | 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b, |
24 | 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13, |
25 | 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42, |
26 | 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a, |
27 | 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69, |
28 | 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21, |
29 | 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70, |
30 | 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38, |
31 | 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e, |
32 | 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36, |
33 | 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67, |
34 | 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f, |
35 | 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, |
36 | 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, |
37 | 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55, |
38 | 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d, |
39 | 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a, |
40 | 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52, |
41 | 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03, |
42 | 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b, |
43 | 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28, |
44 | 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60, |
45 | 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31, |
46 | 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79 |
47 | }; |
48 | EXPORT_SYMBOL(crc7_syndrome_table); |
49 | |
50 | /** |
51 | * crc7 - update the CRC7 for the data buffer |
52 | * @crc: previous CRC7 value |
53 | * @buffer: data pointer |
54 | * @len: number of bytes in the buffer |
55 | * Context: any |
56 | * |
57 | * Returns the updated CRC7 value. |
58 | */ |
59 | u8 crc7(u8 crc, const u8 *buffer, size_t len) |
60 | { |
61 | while (len--) |
62 | crc = crc7_byte(crc, *buffer++); |
63 | return crc; |
64 | } |
65 | EXPORT_SYMBOL(crc7); |
66 | |
67 | MODULE_DESCRIPTION("CRC7 calculations"); |
68 | MODULE_LICENSE("GPL"); |
69 |
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