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diff --git a/sys/dev/it8613hwm/it8613hwm.c b/sys/dev/it8613hwm/it8613hwm.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/it8613hwm/it8613hwm.c
@@ -0,0 +1,225 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Johannes Totz
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <dev/superio/superio.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+struct it8613hwm_softc {
+ struct resource *ioport_res;
+ int ioport_rid;
+
+ struct mtx lock;
+};
+
+static int
+it8613hwm_get_temp_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ device_t dev = (device_t) arg1;
+ struct it8613hwm_softc *sc = device_get_softc(dev);
+ int tempindex = arg2;
+ int tempkelvin = 0;
+ uint8_t tempcelsius;
+ int8_t tempoffset;
+
+ if (tempindex >= 0 && tempindex < 3) {
+ mtx_lock(&sc->lock);
+
+ bus_write_1(sc->ioport_res, 0, 0x29 + tempindex);
+ tempcelsius = bus_read_1(sc->ioport_res, 1);
+
+ /*
+ * The offset registers are: 0x56, 0x57, 0x59.
+ * (Register 0x58 is the vendor id for the chip.)
+ */
+ bus_write_1(sc->ioport_res, 0, 0x56 +
+ (tempindex < 2 ? tempindex : 3));
+ tempoffset = bus_read_1(sc->ioport_res, 1);
+
+ tempkelvin = tempcelsius - tempoffset + 273;
+
+ mtx_unlock(&sc->lock);
+ }
+
+ return (sysctl_handle_int(oidp, &tempkelvin, 0, req));
+}
+
+static int
+it8613hwm_get_fan_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ device_t dev = (device_t) arg1;
+ struct it8613hwm_softc *sc = device_get_softc(dev);
+ int fanindex = arg2;
+ unsigned int fanspeedrpm = 0;
+
+ if (fanindex >= 0 && fanindex < 3) {
+ mtx_lock(&sc->lock);
+
+ /* High bits of fan tachometer. */
+ bus_write_1(sc->ioport_res, 0, 0x18 + fanindex);
+ fanspeedrpm = bus_read_1(sc->ioport_res, 1) << 8;
+ /* Low bits of fan tachometer. */
+ bus_write_1(sc->ioport_res, 0, 0x0D + fanindex);
+ fanspeedrpm |= bus_read_1(sc->ioport_res, 1);
+
+ /*
+ * The fan tacho has a 22.5 kHz clock and produces 2 pulses per
+ * revolution.
+ */
+ if (fanspeedrpm > 0)
+ fanspeedrpm = (22500 * 60) / (fanspeedrpm * 2);
+
+ mtx_unlock(&sc->lock);
+ }
+
+ return (sysctl_handle_int(oidp, &fanspeedrpm, 0, req));
+}
+
+static int
+it8613hwm_probe(device_t dev)
+{
+ if (superio_vendor(dev) != SUPERIO_VENDOR_ITE)
+ return (ENXIO);
+ if (superio_get_type(dev) != SUPERIO_DEV_HWM)
+ return (ENXIO);
+ if (superio_devid(dev) != 0x8613)
+ return (ENXIO);
+
+ device_set_desc(dev, "Hardware monitor on ITE SuperIO");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+it8613hwm_attach(device_t dev)
+{
+ struct it8613hwm_softc *sc = device_get_softc(dev);
+ struct sysctl_ctx_list *ctx;
+ int error;
+ uint16_t iobase;
+ uint8_t chipid;
+
+ /*
+ * The hardware monitor sits at offset 5 in the chip's io address space.
+ * We'll claim two ports: first (iobase + 5 + 0) is the chip's register
+ * selector; the second (iobase + 5 + 1) is the data register.
+ */
+ iobase = superio_get_iobase(dev);
+ error = bus_set_resource(dev, SYS_RES_IOPORT, sc->ioport_rid,
+ iobase + 5, 2);
+ if (error != 0) {
+ device_printf(dev, "bus_set_resource failed\n");
+ return (ENXIO);
+ }
+ sc->ioport_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
+ &sc->ioport_rid, RF_ACTIVE);
+ if (sc->ioport_res == NULL) {
+ device_printf(dev, "bus_alloc_resource_any failed\n");
+ return (ENXIO);
+ }
+
+ /*
+ * Check hardware monitor vendor id.
+ * This should be 0x90 for the it8613.
+ */
+ bus_write_1(sc->ioport_res, 0, 0x58);
+ chipid = bus_read_1(sc->ioport_res, 1);
+ if (chipid != 0x90) {
+ device_printf(dev, "unexpected chip id: "
+ "actual %i != expected %i\n", chipid, 0x90);
+ bus_release_resource(dev, SYS_RES_IOPORT, sc->ioport_rid,
+ sc->ioport_res);
+ return (ENXIO);
+ }
+
+ mtx_init(&sc->lock, device_get_nameunit(dev), "it8613hwm", MTX_DEF);
+
+ ctx = device_get_sysctl_ctx(dev);
+ /* Gets us "dev.it8613hwm.0.temperature0" etc */
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "temperature0", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 0, it8613hwm_get_temp_sysctl, "IK0", "Temperature sensor 0");
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "temperature1", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 1, it8613hwm_get_temp_sysctl, "IK0", "Temperature sensor 1");
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "temperature2", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 2, it8613hwm_get_temp_sysctl, "IK0", "Temperature sensor 2");
+
+ /* Gets us "dev.it8613hwm.0.fan0" etc */
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "fan0", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 0, it8613hwm_get_fan_sysctl, "I", "RPM of fan 0");
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "fan1", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 1, it8613hwm_get_fan_sysctl, "I", "RPM of fan 1");
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "fan2", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ dev, 2, it8613hwm_get_fan_sysctl, "I", "RPM of fan 2");
+
+ return (0);
+}
+
+static int
+it8613hwm_detach(device_t dev)
+{
+ struct it8613hwm_softc *sc = device_get_softc(dev);
+
+ bus_release_resource(dev, SYS_RES_IOPORT, sc->ioport_rid,
+ sc->ioport_res);
+ mtx_destroy(&sc->lock);
+
+ return (0);
+}
+
+static device_method_t it8613hwm_methods[] = {
+ /* Methods from the device interface */
+ DEVMETHOD(device_probe, it8613hwm_probe),
+ DEVMETHOD(device_attach, it8613hwm_attach),
+ DEVMETHOD(device_detach, it8613hwm_detach),
+
+ /* Terminate method list */
+ { 0, 0 }
+};
+
+static driver_t it8613hwm_driver = {
+ "it8613hwm",
+ it8613hwm_methods,
+ sizeof(struct it8613hwm_softc)
+};
+
+DRIVER_MODULE(it8613hwm, superio, it8613hwm_driver, NULL, NULL);
+MODULE_DEPEND(it8613hwm, superio, 1, 1, 1);
+MODULE_VERSION(it8613hwm, 1);
diff --git a/sys/modules/Makefile b/sys/modules/Makefile
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -190,6 +190,7 @@
${_iser} \
isp \
${_ispfw} \
+ ${_it8613hwm} \
${_itwd} \
${_iwi} \
${_iwifw} \
@@ -709,6 +710,7 @@
_exca= exca
_igc= igc
_io= io
+_it8613hwm= it8613hwm
_itwd= itwd
_ix= ix
_ixv= ixv
diff --git a/sys/modules/it8613hwm/Makefile b/sys/modules/it8613hwm/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/it8613hwm/Makefile
@@ -0,0 +1,7 @@
+.PATH: ${SRCTOP}/sys/dev/it8613hwm
+
+KMOD= it8613hwm
+SRCS= it8613hwm.c
+SRCS+= device_if.h bus_if.h isa_if.h
+
+.include <bsd.kmod.mk>

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