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-rw-r--r--share/man/man4/Makefile4
-rw-r--r--share/man/man4/onewire.44
-rw-r--r--share/man/man4/owsbm.466
-rw-r--r--sys/arch/alpha/conf/GENERIC3
-rw-r--r--sys/arch/amd64/conf/GENERIC3
-rw-r--r--sys/arch/armish/conf/GENERIC3
-rw-r--r--sys/arch/cats/conf/GENERIC3
-rw-r--r--sys/arch/hppa/conf/GENERIC3
-rw-r--r--sys/arch/hppa64/conf/GENERIC3
-rw-r--r--sys/arch/i386/conf/GENERIC3
-rw-r--r--sys/arch/macppc/conf/GENERIC3
-rw-r--r--sys/arch/sparc64/conf/GENERIC3
-rw-r--r--sys/arch/zaurus/conf/GENERIC3
-rw-r--r--sys/dev/onewire/files.onewire7
-rw-r--r--sys/dev/onewire/owsbm.c263
15 files changed, 360 insertions, 14 deletions
diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index aea4a2104fe..e141f792323 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.406 2007/02/24 20:43:05 deraadt Exp $
+# $OpenBSD: Makefile,v 1.407 2007/02/28 21:54:43 grange Exp $
MAN= aac.4 ac97.4 acphy.4 \
acpi.4 acpiac.4 acpibat.4 acpibtn.4 acpicpu.4 acpidock.4 \
@@ -30,7 +30,7 @@ MAN= aac.4 ac97.4 acphy.4 \
moscom.4 mpi.4 mpu.4 msk.4 mtd.4 mtdphy.4 multicast.4 mtio.4 ne.4 \
neo.4 netintro.4 nfe.4 nge.4 nmea.4 noct.4 nofn.4 nsclpcsio.4 \
nsgphy.4 nsphy.4 nsphyter.4 null.4 nviic.4 ohci.4 opl.4 options.4 \
- onewire.4 oosiop.4 osiop.4 owid.4 owtemp.4 \
+ onewire.4 oosiop.4 osiop.4 owid.4 owsbm.4 owtemp.4 \
pcagpio.4 pcaled.4 pcdisplay.4 pchb.4 pci.4 pcib.4 pcfadc.4 \
pcfiic.4 pciide.4 pckbc.4 pckbd.4 pcmcia.4 pcn.4 pcppi.4 pcscp.4 \
pf.4 pflog.4 pfsync.4 pgt.4 piixpm.4 pim.4 \
diff --git a/share/man/man4/onewire.4 b/share/man/man4/onewire.4
index aec1d5cd1c3..a8a346fdd4f 100644
--- a/share/man/man4/onewire.4
+++ b/share/man/man4/onewire.4
@@ -1,4 +1,4 @@
-.\" $OpenBSD: onewire.4,v 1.3 2006/09/27 08:54:44 grange Exp $
+.\" $OpenBSD: onewire.4,v 1.4 2007/02/28 21:54:43 grange Exp $
.\"
.\" Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
.\"
@@ -52,6 +52,8 @@ Maxim/Dallas DS2490 USB 1-Wire adapter
.Bl -tag -width 10n -offset ind -compact
.It Xr owid 4
ID family type device
+.It Xr owsbm 4
+smart battery monitor device
.It Xr owtemp 4
temperature family type device
.El
diff --git a/share/man/man4/owsbm.4 b/share/man/man4/owsbm.4
new file mode 100644
index 00000000000..4533970e06c
--- /dev/null
+++ b/share/man/man4/owsbm.4
@@ -0,0 +1,66 @@
+.\" $OpenBSD: owsbm.4,v 1.1 2007/02/28 21:54:43 grange Exp $
+.\"
+.\" Copyright (c) 2007 Aaron Linville <aaron@linville.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd December 4, 2006
+.Dt OWSBM 4
+.Os
+.Sh NAME
+.Nm owsbm
+.Nd 1-Wire smart battery monitor family type device
+.Sh SYNOPSIS
+.Cd "owsbm* at onewire?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the 1-Wire smart battery monitor. The sensor
+possesses a temperature sensor, an A/D converter for measuring both
+battery voltage and current, a current accumulator of both incoming and
+outgoing current, an elapsed time and 40 bytes of nonvolatile EEPROM.
+.Pp
+Only the three voltages (VDD, VAD, CR) and temperature are accessible by
+the
+.Xr sysctl 8
+interface though.
+.Pp
+The following chips are supported by the driver:
+.Pp
+.Bl -bullet -compact -offset indent
+.It
+Maxim/Dallas DS2438
+.El
+.Sh MEASURING CURRENT
+.Pp
+The sensor does not measure current directly. Instead it measures the
+voltage across the Rsens pins.
+.Bl -bullet -offset indent
+I = Voltage CR / Rsens (where Rsens is in Ohms)
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr onewire 4 ,
+.Xr owtemp 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.? .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Aaron Linville Aq aaron@linville.org .
diff --git a/sys/arch/alpha/conf/GENERIC b/sys/arch/alpha/conf/GENERIC
index d04c26c1de1..85d5675777a 100644
--- a/sys/arch/alpha/conf/GENERIC
+++ b/sys/arch/alpha/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.188 2007/02/18 14:18:28 krw Exp $
+# $OpenBSD: GENERIC,v 1.189 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -419,6 +419,7 @@ safe* at pci? # SafeNet SafeXcel 1141/1741
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
#pseudo-device raid 4 # RAIDframe disk driver
diff --git a/sys/arch/amd64/conf/GENERIC b/sys/arch/amd64/conf/GENERIC
index dc81291b193..b4ebe931a41 100644
--- a/sys/arch/amd64/conf/GENERIC
+++ b/sys/arch/amd64/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.173 2007/02/19 17:17:54 deraadt Exp $
+# $OpenBSD: GENERIC,v 1.174 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -507,6 +507,7 @@ scsibus* at iopsp?
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
pseudo-device sequencer 1
diff --git a/sys/arch/armish/conf/GENERIC b/sys/arch/armish/conf/GENERIC
index 89c97acd639..88a36bd25a2 100644
--- a/sys/arch/armish/conf/GENERIC
+++ b/sys/arch/armish/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.13 2006/11/29 14:26:40 deraadt Exp $
+# $OpenBSD: GENERIC,v 1.14 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -176,6 +176,7 @@ ukphy* at mii? # generic unknown PHYs
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
# mouse & keyboard multiplexor pseudo-devices
diff --git a/sys/arch/cats/conf/GENERIC b/sys/arch/cats/conf/GENERIC
index e0d49db6b27..9a5b376ea3b 100644
--- a/sys/arch/cats/conf/GENERIC
+++ b/sys/arch/cats/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.35 2006/09/27 08:54:44 grange Exp $
+# $OpenBSD: GENERIC,v 1.36 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -309,6 +309,7 @@ hifn* at pci? # Hi/fn 7751 crypto card
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
# Pseudo-Devices
diff --git a/sys/arch/hppa/conf/GENERIC b/sys/arch/hppa/conf/GENERIC
index 5b08fbe30ad..47d31ba31fd 100644
--- a/sys/arch/hppa/conf/GENERIC
+++ b/sys/arch/hppa/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.90 2006/12/18 18:59:25 miod Exp $
+# $OpenBSD: GENERIC,v 1.91 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -320,6 +320,7 @@ uk* at scsibus?
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
pseudo-device hotplug 1 # devices hot plugging
diff --git a/sys/arch/hppa64/conf/GENERIC b/sys/arch/hppa64/conf/GENERIC
index dbb2a28c592..8706abbf9d9 100644
--- a/sys/arch/hppa64/conf/GENERIC
+++ b/sys/arch/hppa64/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.12 2006/09/27 08:54:44 grange Exp $
+# $OpenBSD: GENERIC,v 1.13 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -195,6 +195,7 @@ ukphy* at mii? # generic unknown PHYs
# 1-Wire devices
#option ONEWIREVERBOSE
#owid* at onewire? # ID
+#owsbm* at onewire? # Smart Battery Monitor
#owtemp* at onewire? # Temperature
#pseudo-device wsmux 2 # mouse and keyboard multiplexor
diff --git a/sys/arch/i386/conf/GENERIC b/sys/arch/i386/conf/GENERIC
index 700f2590c46..a6c7e8b35d0 100644
--- a/sys/arch/i386/conf/GENERIC
+++ b/sys/arch/i386/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.546 2007/01/22 19:54:24 mk Exp $
+# $OpenBSD: GENERIC,v 1.547 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -702,6 +702,7 @@ scsibus* at iopsp?
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
pseudo-device pctr 1
diff --git a/sys/arch/macppc/conf/GENERIC b/sys/arch/macppc/conf/GENERIC
index 8a533760ec9..7b8d5b2f626 100644
--- a/sys/arch/macppc/conf/GENERIC
+++ b/sys/arch/macppc/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.160 2007/02/16 22:59:44 claudio Exp $g
+# $OpenBSD: GENERIC,v 1.161 2007/02/28 21:54:43 grange Exp $g
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -343,6 +343,7 @@ uk* at scsibus?
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
pseudo-device hotplug 1 # devices hot plugging
diff --git a/sys/arch/sparc64/conf/GENERIC b/sys/arch/sparc64/conf/GENERIC
index 5050c71b9fe..89825323606 100644
--- a/sys/arch/sparc64/conf/GENERIC
+++ b/sys/arch/sparc64/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.167 2007/02/28 18:48:35 miod Exp $
+# $OpenBSD: GENERIC,v 1.168 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -409,6 +409,7 @@ fd* at fdc?
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
pseudo-device hotplug 1 # devices hot plugging
diff --git a/sys/arch/zaurus/conf/GENERIC b/sys/arch/zaurus/conf/GENERIC
index 1b454b50aec..8d601f24f7b 100644
--- a/sys/arch/zaurus/conf/GENERIC
+++ b/sys/arch/zaurus/conf/GENERIC
@@ -1,4 +1,4 @@
-# $OpenBSD: GENERIC,v 1.60 2006/12/09 11:26:33 mbalmer Exp $
+# $OpenBSD: GENERIC,v 1.61 2007/02/28 21:54:43 grange Exp $
#
# For further information on compiling OpenBSD kernels, see the config(8)
# man page.
@@ -205,6 +205,7 @@ flash0 at pxaip? # NAND flash memory
# 1-Wire devices
option ONEWIREVERBOSE
owid* at onewire? # ID
+owsbm* at onewire? # Smart Battery Monitor
owtemp* at onewire? # Temperature
# Pseudo-Devices
diff --git a/sys/dev/onewire/files.onewire b/sys/dev/onewire/files.onewire
index 682dcc4be73..dae25b7a87a 100644
--- a/sys/dev/onewire/files.onewire
+++ b/sys/dev/onewire/files.onewire
@@ -1,4 +1,4 @@
-# $OpenBSD: files.onewire,v 1.1 2006/03/04 16:27:03 grange Exp $
+# $OpenBSD: files.onewire,v 1.2 2007/02/28 21:54:43 grange Exp $
define onewire {}
@@ -14,6 +14,11 @@ device owid
attach owid at onewire
file dev/onewire/owid.c owid
+# Smart Battery Monitor type device
+device owsbm
+attach owsbm at onewire
+file dev/onewire/owsbm.c owsbm
+
# Temperature family type device
device owtemp
attach owtemp at onewire
diff --git a/sys/dev/onewire/owsbm.c b/sys/dev/onewire/owsbm.c
new file mode 100644
index 00000000000..663ddc185f0
--- /dev/null
+++ b/sys/dev/onewire/owsbm.c
@@ -0,0 +1,263 @@
+/* $OpenBSD: owsbm.c,v 1.1 2007/02/28 21:54:43 grange Exp $ */
+
+/*
+ * Copyright (c) 2007 Aaron Linville <aaron@linville.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * 1-Wire Smart Battery Monitor family type device driver.
+ * Provides on-board temperature, an A/D converter for voltage/current,
+ * current accumulator, elapsed time metter, and 40 bytes of nonvolatile
+ * memory.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/rwlock.h>
+#include <sys/sensors.h>
+
+#include <dev/onewire/onewiredevs.h>
+#include <dev/onewire/onewirereg.h>
+#include <dev/onewire/onewirevar.h>
+
+/* Commands */
+#define DSSBM_CMD_READ_SCRATCHPAD 0xbe
+#define DSSBM_CMD_WRITE_SCRATCHPAD 0x4e
+#define DSSBM_CMD_COPY_SCRATCHPAD 0x48
+
+#define DSSBM_CMD_RECALL_MEMORY 0xb8
+
+#define DSSBM_CMD_CONVERT_T 0x44
+#define DSSBM_CMD_CONVERT_V 0xb4
+
+/* Scratchpad layout */
+#define DS2438_SP_STATUS 0
+#define DS2438_SP_TEMP_LSB 1
+#define DS2438_SP_TEMP_MSB 2
+#define DS2438_SP_VOLT_LSB 3
+#define DS2438_SP_VOLT_MSB 4
+#define DS2438_SP_CURRENT_LSB 5
+#define DS2438_SP_CURRENT_MSB 6
+#define DS2438_SP_THRESHOLD 7
+#define DS2438_SP_CRC 8
+
+struct owsbm_softc {
+ struct device sc_dev;
+
+ void * sc_onewire;
+ u_int64_t sc_rom;
+
+ struct sensordev sc_sensordev;
+
+ struct sensor sc_temp;
+ struct sensor sc_voltage_vdd; /* Battery, AD = 1*/
+ struct sensor sc_voltage_vad; /* General purpose, AD = 0 */
+ struct sensor sc_voltage_cr; /* Current Register */
+
+ struct rwlock sc_lock;
+};
+
+int owsbm_match(struct device *, void *, void *);
+void owsbm_attach(struct device *, struct device *, void *);
+int owsbm_detach(struct device *, int);
+int owsbm_activate(struct device *, enum devact);
+
+void owsbm_update(void *);
+
+struct cfattach owsbm_ca = {
+ sizeof(struct owsbm_softc),
+ owsbm_match,
+ owsbm_attach,
+ owsbm_detach,
+ owsbm_activate
+};
+
+struct cfdriver owsbm_cd = {
+ NULL, "owsbm", DV_DULL
+};
+
+static const struct onewire_matchfam owsbm_fams[] = {
+ { ONEWIRE_FAMILY_DS2438 }
+};
+
+int
+owsbm_match(struct device *parent, void *match, void *aux)
+{
+ return (onewire_matchbyfam(aux, owsbm_fams,
+ sizeof(owsbm_fams) /sizeof(owsbm_fams[0])));
+}
+
+void
+owsbm_attach(struct device *parent, struct device *self, void *aux)
+{
+ struct owsbm_softc *sc = (struct owsbm_softc *)self;
+ struct onewire_attach_args *oa = aux;
+
+ sc->sc_onewire = oa->oa_onewire;
+ sc->sc_rom = oa->oa_rom;
+
+ /* Initialize temp sensor */
+ strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+ sizeof(sc->sc_sensordev.xname));
+ sc->sc_temp.type = SENSOR_TEMP;
+ strlcpy(sc->sc_temp.desc, "Temp", sizeof(sc->sc_temp.desc));
+ sensor_attach(&sc->sc_sensordev, &sc->sc_temp);
+
+ /* Initialize voltage sensor */
+ sc->sc_voltage_vdd.type = SENSOR_VOLTS_DC;
+ strlcpy(sc->sc_voltage_vdd.desc, "VDD", sizeof(sc->sc_voltage_vdd.desc));
+ sensor_attach(&sc->sc_sensordev, &sc->sc_voltage_vdd);
+
+ /* Initialize voltage sensor */
+ sc->sc_voltage_vad.type = SENSOR_VOLTS_DC;
+ strlcpy(sc->sc_voltage_vad.desc, "VAD", sizeof(sc->sc_voltage_vad.desc));
+ sensor_attach(&sc->sc_sensordev, &sc->sc_voltage_vad);
+
+ /* Initialize the current sensor */
+ sc->sc_voltage_cr.type = SENSOR_VOLTS_DC;
+ strlcpy(sc->sc_voltage_cr.desc, "CR", sizeof(sc->sc_voltage_cr.desc));
+ sensor_attach(&sc->sc_sensordev, &sc->sc_voltage_cr);
+
+ if (sensor_task_register(sc, owsbm_update, 10)) {
+ printf(": unable to register owsbm update task\n");
+ return;
+ }
+
+ sensordev_install(&sc->sc_sensordev);
+
+ rw_init(&sc->sc_lock, sc->sc_dev.dv_xname);
+ printf("\n");
+}
+
+int
+owsbm_detach(struct device *self, int flags)
+{
+ struct owsbm_softc *sc = (struct owsbm_softc *)self;
+
+ rw_enter_write(&sc->sc_lock);
+ sensordev_deinstall(&sc->sc_sensordev);
+ sensor_task_unregister(sc);
+ rw_exit_write(&sc->sc_lock);
+
+ return (0);
+}
+
+int
+owsbm_activate(struct device *self, enum devact act)
+{
+ return (0);
+}
+
+void
+owsbm_update(void *arg)
+{
+ struct owsbm_softc *sc = arg;
+ u_int8_t data[9];
+
+ rw_enter_write(&sc->sc_lock);
+ onewire_lock(sc->sc_onewire, 0);
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_CONVERT_T);
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_CONVERT_V);
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ /* Issue Recall Memory page 00h cmd */
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_RECALL_MEMORY);
+ onewire_write_byte(sc->sc_onewire, 0);
+
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ /* Read page 0 of Memory Map from Scratchpad */
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_READ_SCRATCHPAD);
+ onewire_write_byte(sc->sc_onewire, 0);
+ onewire_read_block(sc->sc_onewire, data, 9);
+ if (onewire_crc(data, 8) == data[DS2438_SP_CRC]) {
+ sc->sc_temp.value = 273150000 +
+ (int)(((u_int16_t)data[DS2438_SP_TEMP_MSB] << 5) |
+ ((u_int16_t)data[DS2438_SP_TEMP_LSB] >> 3)) * 31250;
+ sc->sc_voltage_vdd.value =
+ (int)(((u_int16_t)data[DS2438_SP_VOLT_MSB] << 8) |
+ data[DS2438_SP_VOLT_LSB]) * 10000;
+
+ sc->sc_voltage_cr.value =
+ (int)(((u_int16_t)data[DS2438_SP_CURRENT_MSB] << 8) |
+ data[DS2438_SP_CURRENT_LSB]) * 244;
+ }
+
+ /* Reconfigure DS2438 to measure VAD */
+
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_WRITE_SCRATCHPAD);
+ onewire_write_byte(sc->sc_onewire, 0);
+ onewire_write_byte(sc->sc_onewire, 0x7); /* AD = 0 */
+
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_CONVERT_V);
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ /* Issue Recall Memory page 00h cmd */
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_RECALL_MEMORY);
+ onewire_write_byte(sc->sc_onewire, 0);
+
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_READ_SCRATCHPAD);
+ onewire_write_byte(sc->sc_onewire, 0);
+ onewire_read_block(sc->sc_onewire, data, 9);
+ if (onewire_crc(data, 8) == data[8]) {
+ sc->sc_voltage_vad.value =
+ (int)(((u_int16_t)data[DS2438_SP_VOLT_MSB] << 8) |
+ data[DS2438_SP_VOLT_LSB]) * 10000;
+ }
+
+ /* Reconfigure back DS2438 to measure VDD (default) */
+
+ if (onewire_reset(sc->sc_onewire) != 0)
+ goto done;
+
+ onewire_matchrom(sc->sc_onewire, sc->sc_rom);
+ onewire_write_byte(sc->sc_onewire, DSSBM_CMD_WRITE_SCRATCHPAD);
+ onewire_write_byte(sc->sc_onewire, 0);
+ onewire_write_byte(sc->sc_onewire, 0xf); /* AD = 1 */
+ onewire_reset(sc->sc_onewire);
+
+done:
+ onewire_unlock(sc->sc_onewire);
+ rw_exit_write(&sc->sc_lock);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 06:55:21 +0000