Line data Source code
1 : /* $OpenBSD: onewire_subr.c,v 1.4 2010/07/19 23:44:09 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 crc8_table[] = {
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 : static const u_int8_t crc16_table_low[] = {
71 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
72 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
73 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
74 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
75 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
76 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
77 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
78 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
79 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
80 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
81 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
82 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
83 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
84 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
85 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
86 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
87 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
88 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
89 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
90 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
91 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
92 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
93 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
94 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
95 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
96 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
97 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
98 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
99 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40,
100 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
101 : 0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41,
102 : 0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40
103 : };
104 :
105 : static const u_int8_t crc16_table_high[] = {
106 : 0x00, 0xc0, 0xc1, 0x01, 0xc3, 0x03, 0x02, 0xc2,
107 : 0xc6, 0x06, 0x07, 0xc7, 0x05, 0xc5, 0xc4, 0x04,
108 : 0xcc, 0x0c, 0x0d, 0xcd, 0x0f, 0xcf, 0xce, 0x0e,
109 : 0x0a, 0xca, 0xcb, 0x0b, 0xc9, 0x09, 0x08, 0xc8,
110 : 0xd8, 0x18, 0x19, 0xd9, 0x1b, 0xdb, 0xda, 0x1a,
111 : 0x1e, 0xde, 0xdf, 0x1f, 0xdd, 0x1d, 0x1c, 0xdc,
112 : 0x14, 0xd4, 0xd5, 0x15, 0xd7, 0x17, 0x16, 0xd6,
113 : 0xd2, 0x12, 0x13, 0xd3, 0x11, 0xd1, 0xd0, 0x10,
114 : 0xf0, 0x30, 0x31, 0xf1, 0x33, 0xf3, 0xf2, 0x32,
115 : 0x36, 0xf6, 0xf7, 0x37, 0xf5, 0x35, 0x34, 0xf4,
116 : 0x3c, 0xfc, 0xfd, 0x3d, 0xff, 0x3f, 0x3e, 0xfe,
117 : 0xfa, 0x3a, 0x3b, 0xfb, 0x39, 0xf9, 0xf8, 0x38,
118 : 0x28, 0xe8, 0xe9, 0x29, 0xeb, 0x2b, 0x2a, 0xea,
119 : 0xee, 0x2e, 0x2f, 0xef, 0x2d, 0xed, 0xec, 0x2c,
120 : 0xe4, 0x24, 0x25, 0xe5, 0x27, 0xe7, 0xe6, 0x26,
121 : 0x22, 0xe2, 0xe3, 0x23, 0xe1, 0x21, 0x20, 0xe0,
122 : 0xa0, 0x60, 0x61, 0xa1, 0x63, 0xa3, 0xa2, 0x62,
123 : 0x66, 0xa6, 0xa7, 0x67, 0xa5, 0x65, 0x64, 0xa4,
124 : 0x6c, 0xac, 0xad, 0x6d, 0xaf, 0x6f, 0x6e, 0xae,
125 : 0xaa, 0x6a, 0x6b, 0xab, 0x69, 0xa9, 0xa8, 0x68,
126 : 0x78, 0xb8, 0xb9, 0x79, 0xbb, 0x7b, 0x7a, 0xba,
127 : 0xbe, 0x7e, 0x7f, 0xbf, 0x7d, 0xbd, 0xbc, 0x7c,
128 : 0xb4, 0x74, 0x75, 0xb5, 0x77, 0xb7, 0xb6, 0x76,
129 : 0x72, 0xb2, 0xb3, 0x73, 0xb1, 0x71, 0x70, 0xb0,
130 : 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
131 : 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54,
132 : 0x9c, 0x5c, 0x5d, 0x9d, 0x5f, 0x9f, 0x9e, 0x5e,
133 : 0x5a, 0x9a, 0x9b, 0x5b, 0x99, 0x59, 0x58, 0x98,
134 : 0x88, 0x48, 0x49, 0x89, 0x4b, 0x8b, 0x8a, 0x4a,
135 : 0x4e, 0x8e, 0x8f, 0x4f, 0x8d, 0x4d, 0x4c, 0x8c,
136 : 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86,
137 : 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40
138 : };
139 :
140 : int
141 0 : onewire_crc(const void *buf, int len)
142 : {
143 : const u_int8_t *p = buf;
144 : u_int8_t crc = 0;
145 :
146 0 : while (len--)
147 0 : crc = crc8_table[crc ^ *p++];
148 :
149 0 : return (crc);
150 : }
151 :
152 : u_int16_t
153 0 : onewire_crc16(const void *buf, int len)
154 : {
155 : const u_int8_t *p = buf;
156 : u_int16_t crc = 0;
157 : u_int16_t tmpcrc;
158 : int idx;
159 :
160 0 : while (len--) {
161 0 : idx = (crc & 0xff) ^ *p++;
162 0 : tmpcrc = crc16_table_high[idx] << 8;
163 0 : tmpcrc |= crc16_table_low[idx] ^ (crc >> 8);
164 : crc = tmpcrc;
165 : }
166 :
167 0 : return (crc);
168 : }
169 :
170 : const char *
171 0 : onewire_famname(int type)
172 : {
173 : #ifdef ONEWIREVERBOSE
174 : const struct onewire_family *of;
175 :
176 0 : for (of = onewire_famtab; of->of_name != NULL; of++)
177 0 : if (of->of_type == type)
178 0 : return (of->of_name);
179 : #endif
180 :
181 0 : return (NULL);
182 0 : }
183 :
184 : int
185 0 : onewire_matchbyfam(struct onewire_attach_args *oa,
186 : const struct onewire_matchfam *fams, int nent)
187 : {
188 : const struct onewire_matchfam *om;
189 : int i;
190 :
191 0 : for (i = 0, om = fams; i < nent; i++, om++)
192 0 : if (ONEWIRE_ROM_FAMILY_TYPE(oa->oa_rom) == om->om_type)
193 0 : return (1);
194 :
195 0 : return (0);
196 0 : }
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