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
58struct oweeprom_softc {
59	device_t			sc_dev;
60	void				*sc_onewire;
61	u_int64_t			sc_rom;
62};
63
64static int	oweeprom_match(device_t, cfdata_t, void *);
65static void	oweeprom_attach(device_t, device_t, void *);
66
67CFATTACH_DECL_NEW(oweeprom, sizeof(struct oweeprom_softc),
68	oweeprom_match, oweeprom_attach, NULL, NULL);
69
70static const struct onewire_matchfam oweeprom_fams[] = {
71	{ ONEWIRE_FAMILY_DS2430 },
72};
73
74static int
75oweeprom_match(device_t parent, cfdata_t match, void *aux)
76{
77	return (onewire_matchbyfam(aux, oweeprom_fams,
78	    __arraycount(oweeprom_fams)));
79}
80
81static void
82oweeprom_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