1 /* $NetBSD: onewire_subr.c,v 1.3 2006/04/14 18:38:50 riz Exp $ */ 2 /* $OpenBSD: onewire_subr.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */ 3 4 /* 5 * Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * 1-Wire bus miscellaneous routines. 22 */ 23 24 #include <sys/param.h> 25 #include <sys/systm.h> 26 #include <sys/device.h> 27 28 #include <dev/onewire/onewiredevs.h> 29 #include <dev/onewire/onewirereg.h> 30 #include <dev/onewire/onewirevar.h> 31 32 #ifdef ONEWIREVERBOSE 33 struct onewire_family { 34 int of_type; 35 const char * of_name; 36 }; 37 #include <dev/onewire/onewiredevs_data.h> 38 #endif 39 40 static const u_int8_t crctable[] = { 41 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, 42 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41, 43 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e, 44 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc, 45 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0, 46 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62, 47 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d, 48 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff, 49 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5, 50 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07, 51 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58, 52 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a, 53 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6, 54 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24, 55 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b, 56 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9, 57 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f, 58 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd, 59 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92, 60 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50, 61 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c, 62 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee, 63 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1, 64 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73, 65 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49, 66 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b, 67 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4, 68 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16, 69 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a, 70 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8, 71 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7, 72 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35 73 }; 74 75 int 76 onewire_crc(const void *buf, int len) 77 { 78 const u_int8_t *p = buf; 79 u_int8_t crc = 0; 80 81 while (len--) 82 crc = crctable[crc ^ *p++]; 83 84 return (crc); 85 } 86 87 const char * 88 onewire_famname(int type) 89 { 90 #ifdef ONEWIREVERBOSE 91 const struct onewire_family *of; 92 93 for (of = onewire_famtab; of->of_name != NULL; of++) 94 if (of->of_type == type) 95 return (of->of_name); 96 #endif 97 98 return (NULL); 99 } 100 101 int 102 onewire_matchbyfam(struct onewire_attach_args *oa, 103 const struct onewire_matchfam *fams, int nent) 104 { 105 const struct onewire_matchfam *om; 106 int i; 107 108 for (i = 0, om = fams; i < nent; i++, om++) 109 if (ONEWIRE_ROM_FAMILY_TYPE(oa->oa_rom) == om->om_type) 110 return (1); 111 112 return (0); 113 } 114