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Annotation of sys/dev/onewire/onewire_subr.c, Revision 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: }