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      1 /*	$NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Michael Lorenz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * 1-Wire EEPROM family type device driver.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: oweeprom.c,v 1.1 2020/04/14 13:35:24 macallan Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/device.h>
     42 #include <sys/kernel.h>
     43 #include <sys/proc.h>
     44 
     45 #include <dev/onewire/onewiredevs.h>
     46 #include <dev/onewire/onewirereg.h>
     47 #include <dev/onewire/onewirevar.h>
     48 
     49 #define EEPROM_CMD_WRITE_SCRATCHPAD	0x0f
     50 #define EEPROM_CMD_READ_SCRATCHPAD	0xaa
     51 #define EEPROM_CMD_COPY_SCRATCHPAD	0x55
     52 #define EEPROM_CMD_READ_MEMORY		0xf0
     53 #define EEPROM_CMD_WRITE_APPREG		0x99
     54 #define EEPROM_CMD_READ_STATUS		0x66
     55 #define EEPROM_CMD_READ_APPREG		0xc3
     56 #define EEPROM_CMD_COPY_LOCK_APPREG	0x5a
     57 
     58 struct oweeprom_softc {
     59 	device_t			sc_dev;
     60 	void				*sc_onewire;
     61 	u_int64_t			sc_rom;
     62 };
     63 
     64 static int	oweeprom_match(device_t, cfdata_t, void *);
     65 static void	oweeprom_attach(device_t, device_t, void *);
     66 
     67 CFATTACH_DECL_NEW(oweeprom, sizeof(struct oweeprom_softc),
     68 	oweeprom_match, oweeprom_attach, NULL, NULL);
     69 
     70 static const struct onewire_matchfam oweeprom_fams[] = {
     71 	{ ONEWIRE_FAMILY_DS2430 },
     72 };
     73 
     74 static int
     75 oweeprom_match(device_t parent, cfdata_t match, void *aux)
     76 {
     77 	return (onewire_matchbyfam(aux, oweeprom_fams,
     78 	    __arraycount(oweeprom_fams)));
     79 }
     80 
     81 static void
     82 oweeprom_attach(device_t parent, device_t self, void *aux)
     83 {
     84 	struct oweeprom_softc *sc = device_private(self);
     85 	struct onewire_attach_args *oa = aux;
     86 	int i, j;
     87 	uint8_t data[32];
     88 
     89 	aprint_naive("\n");
     90 
     91 	sc->sc_dev = self;
     92 	sc->sc_onewire = oa->oa_onewire;
     93 	sc->sc_rom = oa->oa_rom;
     94 
     95 	aprint_normal("\n");
     96 
     97 	onewire_lock(sc->sc_onewire);
     98 	if (onewire_reset(sc->sc_onewire) != 0) {
     99 		printf("reset failrd\n");
    100 		return;
    101 	}
    102 
    103 	onewire_matchrom(sc->sc_onewire, sc->sc_rom);
    104 	onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_MEMORY);
    105 	onewire_write_byte(sc->sc_onewire, 0);
    106 	onewire_read_block(sc->sc_onewire, data, 32);
    107 	printf("EEPROM\n");
    108 	for (i = 0; i < 32; i += 8) {
    109 		printf("%02x:", i);
    110 		for (j = 0; j < 8; j++)
    111 			printf(" %02x", data[i + j]);
    112 		printf("\n");
    113 	}
    114 
    115 	if (onewire_reset(sc->sc_onewire) != 0) {
    116 		printf("reset failrd\n");
    117 		return;
    118 	}
    119 
    120 	onewire_matchrom(sc->sc_onewire, sc->sc_rom);
    121 	onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_APPREG);
    122 	onewire_write_byte(sc->sc_onewire, 0);
    123 	onewire_read_block(sc->sc_onewire, data, 8);
    124 	printf("Application register\n");
    125 	for (j = 0; j < 8; j++)
    126 		printf(" %02x", data[j]);
    127 	printf("\n");
    128 
    129 	if (onewire_reset(sc->sc_onewire) != 0) {
    130 		printf("reset failrd\n");
    131 		return;
    132 	}
    133 
    134 	onewire_matchrom(sc->sc_onewire, sc->sc_rom);
    135 	onewire_write_byte(sc->sc_onewire, EEPROM_CMD_READ_STATUS);
    136 	onewire_write_byte(sc->sc_onewire, 0);
    137 	onewire_read_block(sc->sc_onewire, data, 1);
    138 	printf("Status register %02x\n", data[0]);
    139 
    140 	onewire_unlock(sc->sc_onewire);
    141 }
    142