/*      $NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $    */

/*-
 * Copyright (c) 2020 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Michael Lorenz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * 1-Wire EEPROM family type device driver.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/proc.h>

#include <dev/onewire/onewiredevs.h>
#include <dev/onewire/onewirereg.h>
#include <dev/onewire/onewirevar.h>

#define EEPROM_CMD_WRITE_SCRATCHPAD     0x0f
#define EEPROM_CMD_READ_SCRATCHPAD      0xaa
#define EEPROM_CMD_COPY_SCRATCHPAD      0x55
#define EEPROM_CMD_READ_MEMORY          0xf0
#define EEPROM_CMD_WRITE_APPREG         0x99
#define EEPROM_CMD_READ_STATUS          0x66
#define EEPROM_CMD_READ_APPREG          0xc3
#define EEPROM_CMD_COPY_LOCK_APPREG     0x5a

struct oweeprom_softc {
        device_t                        sc_dev;
        void                            *sc_onewire;
        u_int64_t                       sc_rom;
};

static int      oweeprom_match(device_t, cfdata_t, void *);
static void     oweeprom_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(oweeprom, sizeof(struct oweeprom_softc),
        oweeprom_match, oweeprom_attach, NULL, NULL);

static const struct onewire_matchfam oweeprom_fams[] = {
        { ONEWIRE_FAMILY_DS2430 },
};

static int
oweeprom_match(device_t parent, cfdata_t match, void *aux)
{
        return (onewire_matchbyfam(aux, oweeprom_fams,
            __arraycount(oweeprom_fams)));
}

static void
oweeprom_attach(device_t parent, device_t self, void *aux)
{
        struct oweeprom_softc *sc = device_private(self);
        struct onewire_attach_args *oa = aux;
        int i, j;
        uint8_t data[32];

        aprint_naive("\n");

        sc->sc_dev = self;
        sc->sc_onewire = oa->oa_onewire;
        sc->sc_rom = oa->oa_rom;

        aprint_normal("\n");

        onewire_lock(sc->sc_onewire);
        if (onewire_reset(sc->sc_onewire) != 0) {
                printf("reset failrd\n");
                return;
        }

        onewire_matchrom(sc->sc_onewire, sc->sc_rom);
        onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_MEMORY);
        onewire_write_byte(sc->sc_onewire, 0);
        onewire_read_block(sc->sc_onewire, data, 32);
        printf("EEPROM\n");
        for (i = 0; i < 32; i += 8) {
                printf("%02x:", i);
                for (j = 0; j < 8; j++)
                        printf(" %02x", data[i + j]);
                printf("\n");
        }

        if (onewire_reset(sc->sc_onewire) != 0) {
                printf("reset failrd\n");
                return;
        }

        onewire_matchrom(sc->sc_onewire, sc->sc_rom);
        onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_APPREG);
        onewire_write_byte(sc->sc_onewire, 0);
        onewire_read_block(sc->sc_onewire, data, 8);
        printf("Application register\n");
        for (j = 0; j < 8; j++)
                printf(" %02x", data[j]);
        printf("\n");

        if (onewire_reset(sc->sc_onewire) != 0) {
                printf("reset failrd\n");
                return;
        }

        onewire_matchrom(sc->sc_onewire, sc->sc_rom);
        onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_STATUS);
        onewire_write_byte(sc->sc_onewire, 0);
        onewire_read_block(sc->sc_onewire, data, 1);
        printf("Status register %02x\n", data[0]);

        onewire_unlock(sc->sc_onewire);
}