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
oweeprom_match(device_t parent,cfdata_t match,void * aux)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
oweeprom_attach(device_t parent,device_t self,void * aux)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