142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/* $NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $ */
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/*-
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Michael Lorenz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* 1-Wire EEPROM family type device driver.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <dev/onewire/onewiredevs.h>
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#include <dev/onewire/onewirereg.h>
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#include <dev/onewire/onewirevar.h>
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#define EEPROM_CMD_WRITE_SCRATCHPAD 0x0f
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#define EEPROM_CMD_READ_SCRATCHPAD 0xaa
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#define EEPROM_CMD_COPY_SCRATCHPAD 0x55
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#define EEPROM_CMD_READ_MEMORY 0xf0
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#define EEPROM_CMD_WRITE_APPREG 0x99
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#define EEPROM_CMD_READ_STATUS 0x66
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#define EEPROM_CMD_READ_APPREG 0xc3
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#define EEPROM_CMD_COPY_LOCK_APPREG 0x5a
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struct oweeprom_softc {
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device_t sc_dev;
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void *sc_onewire;
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u_int64_t sc_rom;
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};
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static int oweeprom_match(device_t, cfdata_t, void *);
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static void oweeprom_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(oweeprom, sizeof(struct oweeprom_softc),
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oweeprom_match, oweeprom_attach, NULL, NULL);
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static const struct onewire_matchfam oweeprom_fams[] = {
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{ ONEWIRE_FAMILY_DS2430 },
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};
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static int
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oweeprom_match(device_t parent, cfdata_t match, void *aux)
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{
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return (onewire_matchbyfam(aux, oweeprom_fams,
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__arraycount(oweeprom_fams)));
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}
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static void
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oweeprom_attach(device_t parent, device_t self, void *aux)
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{
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struct oweeprom_softc *sc = device_private(self);
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struct onewire_attach_args *oa = aux;
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int i, j;
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uint8_t data[32];
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aprint_naive("\n");
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sc->sc_dev = self;
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sc->sc_onewire = oa->oa_onewire;
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sc->sc_rom = oa->oa_rom;
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aprint_normal("\n");
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onewire_lock(sc->sc_onewire);
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if (onewire_reset(sc->sc_onewire) != 0) {
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printf("reset failrd\n");
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return;
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}
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onewire_matchrom(sc->sc_onewire, sc->sc_rom);
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onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_MEMORY);
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onewire_write_byte(sc->sc_onewire, 0);
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onewire_read_block(sc->sc_onewire, data, 32);
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printf("EEPROM\n");
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for (i = 0; i < 32; i += 8) {
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printf("%02x:", i);
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for (j = 0; j < 8; j++)
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printf(" %02x", data[i + j]);
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printf("\n");
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}
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if (onewire_reset(sc->sc_onewire) != 0) {
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printf("reset failrd\n");
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return;
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}
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onewire_matchrom(sc->sc_onewire, sc->sc_rom);
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onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_APPREG);
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onewire_write_byte(sc->sc_onewire, 0);
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onewire_read_block(sc->sc_onewire, data, 8);
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printf("Application register\n");
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for (j = 0; j < 8; j++)
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printf(" %02x", data[j]);
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printf("\n");
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if (onewire_reset(sc->sc_onewire) != 0) {
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printf("reset failrd\n");
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return;
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}
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onewire_matchrom(sc->sc_onewire, sc->sc_rom);
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onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_STATUS);
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onewire_write_byte(sc->sc_onewire, 0);
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onewire_read_block(sc->sc_onewire, data, 1);
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printf("Status register %02x\n", data[0]);
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onewire_unlock(sc->sc_onewire);
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}
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