Annotation of sys/dev/onewire/onewire_subr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: onewire_subr.c,v 1.2 2007/02/28 22:31:32 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: /*
20: * 1-Wire bus miscellaneous routines.
21: */
22:
23: #include <sys/param.h>
24: #include <sys/systm.h>
25: #include <sys/device.h>
26:
27: #include <dev/onewire/onewiredevs.h>
28: #include <dev/onewire/onewirereg.h>
29: #include <dev/onewire/onewirevar.h>
30:
31: #ifdef ONEWIREVERBOSE
32: #include <dev/onewire/onewiredevs_data.h>
33: #endif
34:
35: static const u_int8_t crctable[] = {
36: 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
37: 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
38: 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e,
39: 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc,
40: 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0,
41: 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62,
42: 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d,
43: 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff,
44: 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5,
45: 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07,
46: 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58,
47: 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a,
48: 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6,
49: 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24,
50: 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b,
51: 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9,
52: 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f,
53: 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd,
54: 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92,
55: 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50,
56: 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c,
57: 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee,
58: 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1,
59: 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73,
60: 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49,
61: 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b,
62: 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4,
63: 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16,
64: 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a,
65: 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8,
66: 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7,
67: 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35
68: };
69:
70: int
71: onewire_crc(const void *buf, int len)
72: {
73: const u_int8_t *p = buf;
74: u_int8_t crc = 0;
75:
76: while (len--)
77: crc = crctable[crc ^ *p++];
78:
79: return (crc);
80: }
81:
82: const char *
83: onewire_famname(int type)
84: {
85: #ifdef ONEWIREVERBOSE
86: const struct onewire_family *of;
87:
88: for (of = onewire_famtab; of->of_name != NULL; of++)
89: if (of->of_type == type)
90: return (of->of_name);
91: #endif
92:
93: return (NULL);
94: }
95:
96: int
97: onewire_matchbyfam(struct onewire_attach_args *oa,
98: const struct onewire_matchfam *fams, int nent)
99: {
100: const struct onewire_matchfam *om;
101: int i;
102:
103: for (i = 0, om = fams; i < nent; i++, om++)
104: if (ONEWIRE_ROM_FAMILY_TYPE(oa->oa_rom) == om->om_type)
105: return (1);
106:
107: return (0);
108: }
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