| 1 | /* $NetBSD: onewire_subr.c,v 1.6 2007/12/11 12:36:02 lukem 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/cdefs.h> |
| 25 | __KERNEL_RCSID(0, "$NetBSD: onewire_subr.c,v 1.6 2007/12/11 12:36:02 lukem Exp $" ); |
| 26 | |
| 27 | #include <sys/param.h> |
| 28 | #include <sys/systm.h> |
| 29 | #include <sys/device.h> |
| 30 | |
| 31 | #include <dev/onewire/onewiredevs.h> |
| 32 | #include <dev/onewire/onewirereg.h> |
| 33 | #include <dev/onewire/onewirevar.h> |
| 34 | |
| 35 | #ifdef ONEWIREVERBOSE |
| 36 | struct onewire_family { |
| 37 | int of_type; |
| 38 | const char * of_name; |
| 39 | }; |
| 40 | #include <dev/onewire/onewiredevs_data.h> |
| 41 | #endif |
| 42 | |
| 43 | static const u_int8_t crctable[] = { |
| 44 | 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, |
| 45 | 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41, |
| 46 | 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e, |
| 47 | 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc, |
| 48 | 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0, |
| 49 | 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62, |
| 50 | 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d, |
| 51 | 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff, |
| 52 | 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5, |
| 53 | 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07, |
| 54 | 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58, |
| 55 | 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a, |
| 56 | 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6, |
| 57 | 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24, |
| 58 | 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b, |
| 59 | 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9, |
| 60 | 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f, |
| 61 | 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd, |
| 62 | 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92, |
| 63 | 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50, |
| 64 | 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c, |
| 65 | 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee, |
| 66 | 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1, |
| 67 | 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73, |
| 68 | 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49, |
| 69 | 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b, |
| 70 | 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4, |
| 71 | 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16, |
| 72 | 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a, |
| 73 | 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8, |
| 74 | 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7, |
| 75 | 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35 |
| 76 | }; |
| 77 | |
| 78 | int |
| 79 | onewire_crc(const void *buf, int len) |
| 80 | { |
| 81 | const u_int8_t *p = buf; |
| 82 | u_int8_t crc = 0; |
| 83 | |
| 84 | while (len--) |
| 85 | crc = crctable[crc ^ *p++]; |
| 86 | |
| 87 | return (crc); |
| 88 | } |
| 89 | |
| 90 | const char * |
| 91 | onewire_famname(int type) |
| 92 | { |
| 93 | #ifdef ONEWIREVERBOSE |
| 94 | const struct onewire_family *of; |
| 95 | |
| 96 | for (of = onewire_famtab; of->of_name != NULL; of++) |
| 97 | if (of->of_type == type) |
| 98 | return (of->of_name); |
| 99 | #endif |
| 100 | |
| 101 | return (NULL); |
| 102 | } |
| 103 | |
| 104 | int |
| 105 | onewire_matchbyfam(struct onewire_attach_args *oa, |
| 106 | const struct onewire_matchfam *fams, int nent) |
| 107 | { |
| 108 | const struct onewire_matchfam *om; |
| 109 | int i; |
| 110 | |
| 111 | for (i = 0, om = fams; i < nent; i++, om++) |
| 112 | if (ONEWIRE_ROM_FAMILY_TYPE(oa->oa_rom) == om->om_type) |
| 113 | return (1); |
| 114 | |
| 115 | return (0); |
| 116 | } |
| 117 | |