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+.\"	$NetBSD: adm1026hm.4,v 1.4 2026/02/16 19:14:42 uwe Exp $
+.\"
+.\" Copyright (c) 2015 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Julian Coleman.
+.\"
+.\" 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.
+.\"
+.Dd February 16, 2026
+.Dt ADM1026HM 4
+.Os
+.Sh NAME
+.Nm adm1026hm
+.Nd Analog Devices ADM1026 complete thermal system management controller
+.Sh SYNOPSIS
+.Cd "adm1026hm* at iic? addr?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Analog Devices ADM1026 hardware monitor.
+The chip possesses 8 fan speed sensors, 3 temperature sensors,
+and 17 voltage sensors.
+The number of each sensor type configured by the driver depends on the
+chip configuration.
+.Pp
+The values of the sensors are made available through the
+.Xr envstat 8
+interface.
+.Bl -column ".Li V3.3 standby" "mV DC" -offset indent
+.It Sy Sensor     Ta Sy Units  Ta Sy Description
+.It Li fan Ar N      Ta RPM    Ta Fan 0\^\(en7
+.It Li internal      Ta C      Ta Internal temperature
+.It Li external Ar N Ta C      Ta External temperature 1\(en2
+.It Li Vbatt         Ta mV DC  Ta Battery voltage
+.It Li V3.3 standby  Ta mV DC  Ta 3.3V standby voltage
+.It Li V3.3 main     Ta mV DC  Ta 3.3V main voltage
+.It Li V5.0          Ta mV DC  Ta 5.0V supply voltage
+.It Li V+12          Ta mV DC  Ta +12V supply voltage
+.It Li V-12          Ta mV DC  Ta \-12V supply voltage
+.It Li V3.3 Ar N     Ta mV DC  Ta Analog in (3.3V reference) 0\^\(en5
+.It Li V2.5 Ar N     Ta mV DC  Ta Analog in (2.5V reference) 0\^\(en3
+.El
+.Pp
+Configurable limits for the sensors are also available via
+.Xr envstat 8 .
+Initial limit values are read from the chip.
+Each temperature sensor has a high, therm and low limit, which are
+mapped to
+.Fa critmax ,
+.Fa warnmax
+and
+.Fa warnmin ,
+respectively.
+Voltage sensors have high
+.Pq Fa warnmax
+and low
+.Pq Fa warnmin
+limits.
+Fan sensors have a high limit mapped to
+.Fa warnmin ,
+because the fan measurements are revolution intervals, so higher
+numbers correlate to lower fan speeds.
+.Sh SEE ALSO
+.Xr iic 4 ,
+.Xr intro 4 ,
+.Xr envstat 8
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Julian Coleman Aq Mt jcoleman@NetBSD.org .
+.Sh BUGS
+It's not possible to determine if either a sensor is not connected,
+or the monitored device is producing no output.
+Therefore, unconnected sensors will show outputs of 0.
+.Pp
+The
+.Nm
+driver does not support interrupt output nor the built-in EEPROM.