add 'driver' for DS2430A EEPROMs which simply dumps the chip's contents and

status register

sys/dev/onewire/files.onewire

@@ -1,4 +1,4 @@
-# $NetBSD: files.onewire,v 1.3 2006/04/14 18:38:50 riz Exp $
+# $NetBSD: files.onewire,v 1.4 2020/04/14 13:35:24 macallan Exp $
 
 define	onewire {}
 
@@ -13,3 +13,8 @@ file	dev/onewire/onewire_bitbang.c	onewire_bitbang
 device	owtemp: sysmon_envsys
 attach	owtemp at onewire
 file	dev/onewire/owtemp.c		owtemp
+
+# 256bit EEPROM
+device 	oweeprom
+attach 	oweeprom at onewire
+file 	dev/onewire/oweeprom.c		oweeprom

sys/dev/onewire/oweeprom.c

@@ -0,0 +1,141 @@
+/*	$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);
+}