[src/trunk]: src/sys/dev/onewire add 'driver' for DS2430A EEPROMs which simpl...

[macallan <macallan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5cdeecad112a
branches:  trunk
changeset: 971130:5cdeecad112a
user:      macallan <macallan%NetBSD.org@localhost>
date:      Tue Apr 14 13:35:24 2020 +0000

description:
add 'driver' for DS2430A EEPROMs which simply dumps the chip's contents and
status register

diffstat:

 sys/dev/onewire/files.onewire |    7 +-
 sys/dev/onewire/oweeprom.c    |  141 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+), 1 deletions(-)

diffs (163 lines):

diff -r 442d1eaef1c9 -r 5cdeecad112a sys/dev/onewire/files.onewire
--- a/sys/dev/onewire/files.onewire     Tue Apr 14 13:32:56 2020 +0000
+++ b/sys/dev/onewire/files.onewire     Tue Apr 14 13:35:24 2020 +0000
@@ -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 @@
 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
diff -r 442d1eaef1c9 -r 5cdeecad112a sys/dev/onewire/oweeprom.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/onewire/oweeprom.c        Tue Apr 14 13:35:24 2020 +0000
@@ -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);
+}