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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1866,6 +1866,7 @@
dev/iicbus/sensor/htu21.c optional htu21
dev/iicbus/sensor/lm75.c optional lm75
dev/iicbus/sensor/max44009.c optional max44009
+dev/iicbus/sensor/w83793g.c optional w83793g
dev/iicbus/gpio/pcf8574.c optional pcf8574
dev/iicbus/gpio/tca64xx.c optional tca64xx fdt gpio
dev/iicbus/pmic/fan53555.c optional fan53555 fdt | tcs4525 fdt
diff --git a/sys/dev/iicbus/sensor/w83793g.c b/sys/dev/iicbus/sensor/w83793g.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/iicbus/sensor/w83793g.c
@@ -0,0 +1,366 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 Justin Hibbits
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/sysctl.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+/*
+ * Driver for the Winbond W83793G hardware monitor.
+ *
+ * The hardware monitor supports the following sensors:
+ * - 6 temperature sensors
+ * - 4 with 1/4 integer precision
+ * - 2 with integer precision
+ * - 11 voltage sensors
+ * - 12 fan sensors
+ * - FanIn 6-12 are on multifunction pins, so may not be enabled.
+ * 8 DC/PWM fan outputs for fan speed control
+ * - Case open detection
+ */
+
+#define WB_TD_BASE 0x1c
+#define WB_TLOW 0x22
+
+#define WB_VCORE_A 0x10
+#define WB_VCORE_B 0x11
+#define WB_VTT 0x12
+#define WB_VSEN1 0x14
+#define WB_VSEN2 0x15
+#define WB_VSEN3 0x16
+#define WB_VSEN4 0x17
+#define WB_5VDD 0x18
+#define WB_5VSB 0x19
+#define WB_VBAT 0x1a
+#define WB_VLOW 0x1b
+#define WB_FAN_BASE 0x23
+
+#define INT_STS1 0x41
+#define INT_STS2 0x42
+#define INT_STS3 0x43
+#define INT_STS4 0x44
+#define CHASSIS 0x40
+#define INT_STS5 0x45
+#define INT_MASK1 0x46
+#define INT_MASK2 0x47
+#define INT_MASK3 0x48
+#define INT_MASK4 0x49
+#define CLR_CHS 0x80
+#define INT_MASK5 0x4a
+
+#define WB_MFC 0x58 /* Multi-function pin control */
+#define MFC_VIDBSEL 0x80
+#define MFC_SIB_SEL 0x40
+#define MFC_SID_SEL_M 0x30
+#define MFC_SID_VID 0x00
+#define MFC_SID_FANIN 0x20
+#define MFC_SIC_SEL_M 0x0c
+#define MFC_SIC_VID 0x00
+#define MFC_SIC_FANIN 0x08
+#define MFC_SIA_SEL 0x02
+#define MFC_FAN8SEL 0x01
+#define WB_FANIN_CTRL 0x5c
+#define FANIN_EN_12 0x40
+#define FANIN_EN_11 0x20
+#define FANIN_EN_10 0x10
+#define FANIN_EN_9 0x08
+#define FANIN_EN_8 0x04
+#define FANIN_EN_7 0x02
+#define FANIN_EN_6 0x01
+#define WB_FANIN_SEL 0x5d
+#define WB_TD_MD 0x5e /* TD mode select register */
+#define TD_MD_M(n) (0x3 << ((n) * 2))
+#define TD_MD_S(n) ((n) * 2)
+#define TD_STOP_M 0x0
+#define TD_INT_MD 0x1
+#define TD_EXT_MD 0x2
+#define WB_TR_MD 0x5f
+#define TR2_MD 0x2
+#define TR1_MD 0x1
+
+#define WB_TEMP_COUNT 6 /* Total temperature sensors */
+#define WB_TD_COUNT 4 /* Temp sensors with "low" part */
+#define WB_TR_COUNT 2
+#define WB_FAN_COUNT 12
+#define WB_FAN_ALWAYS_ON 5 /* First 5 are not controlled */
+#define WB_V_COUNT 11
+
+static const struct wb_vsens {
+ const char *name;
+ int reg;
+ int scale; /* Scale in millivolts */
+ int add; /* Scale in millivolts */
+ int left_low; /* left bit in VLOW, if applicable */
+} voltages[] = {
+ { "v_core_a", WB_VCORE_A, 2, 0, 1 },
+ { "v_core_b", WB_VCORE_B, 2, 0, 3 },
+ { "v_tt", WB_VTT, 2, 0, 5 },
+ { "v_sen_1", WB_VSEN1, 16 },
+ { "v_sen_2", WB_VSEN2, 16 },
+ { "v_sen_3", WB_VSEN3, 16 },
+ { "v_sen_4", WB_VSEN4, 8 },
+ { "5v", WB_5VDD, 24, 150 },
+ { "5v_sb", WB_5VSB, 24, 150 },
+ { "v_bat", WB_VBAT, 16 }
+};
+
+struct w83793g_softc {
+ device_t sc_dev;
+
+};
+
+static device_probe_t w83793g_probe;
+static device_attach_t w83793g_attach;
+static device_detach_t w83793g_detach;
+static int w83793g_temp_sysctl(SYSCTL_HANDLER_ARGS);
+static int w83793g_fan_sysctl(SYSCTL_HANDLER_ARGS);
+static int w83793g_voltage_sysctl(SYSCTL_HANDLER_ARGS);
+static int w83793g_case_sysctl(SYSCTL_HANDLER_ARGS);
+
+static device_method_t w83793g_methods[] = {
+ DEVMETHOD(device_probe, w83793g_probe),
+ DEVMETHOD(device_attach, w83793g_attach),
+ DEVMETHOD(device_detach, w83793g_detach),
+
+ DEVMETHOD_END
+};
+
+static struct ofw_compat_data compat[] = {
+ { "winbond,w83793", 1 },
+ { NULL, 0 }
+};
+
+DEFINE_CLASS_0(w83793g, w83793g_driver, w83793g_methods,
+ sizeof(struct w83793g_softc));
+DRIVER_MODULE(w83793g, iicbus, w83793g_driver, NULL, NULL);
+MODULE_VERSION(w83793g, 1);
+MODULE_DEPEND(w83793g, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
+IICBUS_FDT_PNP_INFO(compat);
+
+static int
+w83793g_readreg(device_t dev, int reg, uint8_t *output)
+{
+ return (iicdev_readfrom(dev, reg, output, sizeof(*output), IIC_WAIT));
+}
+
+static int
+w83793g_writereg(device_t dev, int reg, uint8_t *output)
+{
+ return (iicdev_writeto(dev, reg, output, sizeof(*output), IIC_WAIT));
+}
+
+static bool
+temp_enabled(struct w83793g_softc *sc, int sensor)
+{
+ uint8_t reg;
+ int error;
+
+ if (sensor < WB_TD_COUNT) {
+ error = w83793g_readreg(sc->sc_dev, WB_TD_MD, &reg);
+ if (error != 0)
+ return (false);
+ return ((reg & TD_MD_M(sensor)) != 0);
+ } else {
+ error = w83793g_readreg(sc->sc_dev, WB_TR_MD, &reg);
+ sensor -= WB_TD_COUNT;
+ if (error != 0)
+ return (false);
+ return ((reg & (1 << sensor)) != 0);
+ }
+}
+
+static bool
+fan_enabled(struct w83793g_softc *sc, int fan)
+{
+ int error;
+ uint8_t fanin_ctl;
+
+ if (fan < WB_FAN_ALWAYS_ON)
+ return (true);
+
+ error = w83793g_readreg(sc->sc_dev, WB_FANIN_CTRL, &fanin_ctl);
+ if (error != 0)
+ return (false);
+
+ fan -= WB_FAN_ALWAYS_ON;
+
+ return ((fanin_ctl & (1 << fan)) != 0);
+}
+
+static int
+w83793g_probe(device_t dev)
+{
+ if (ofw_bus_search_compatible(dev, compat)->ocd_data == 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "Winbond W83793 Hardware Monitor");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+w83793g_attach(device_t dev)
+{
+ struct w83793g_softc *sc = device_get_softc(dev);
+ struct sysctl_oid *root = device_get_sysctl_tree(dev);
+ struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
+ struct sysctl_oid *node;
+ int i;
+
+ sc->sc_dev = dev;
+ node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(root), OID_AUTO, "voltages",
+ CTLFLAG_RD, NULL, NULL);
+ for (i = 0; i < nitems(voltages); i++) {
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO,
+ voltages[i].name, CTLTYPE_INT | CTLFLAG_RD, sc,
+ i, w83793g_voltage_sysctl, "I",
+ "voltage (millivolts)");
+ }
+ node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(root), OID_AUTO, "temp",
+ CTLFLAG_RD, NULL, NULL);
+ for (i = 0; i < WB_TEMP_COUNT; i++) {
+ /* Only supports single-digit sensors. */
+ char name[sizeof("sensor_") + 1];
+
+ if (!temp_enabled(sc, i))
+ continue;
+ snprintf(name, sizeof(name), "sensor_%d", i);
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, name,
+ CTLTYPE_INT | CTLFLAG_RD, sc, WB_TD_BASE + i,
+ w83793g_temp_sysctl, "IK2", NULL);
+ }
+ node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(root), OID_AUTO, "fans",
+ CTLFLAG_RD, NULL, NULL);
+ for (i = 0; i < WB_FAN_COUNT; i++) {
+ /* Supports up to 12 fans */
+ char name[sizeof("fan_") + 2];
+
+ if (!fan_enabled(sc, i))
+ continue;
+ snprintf(name, sizeof(name), "fan_%d", i);
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, name,
+ CTLTYPE_INT | CTLFLAG_RD, sc, WB_FAN_BASE + i,
+ w83793g_fan_sysctl, "I", NULL);
+ }
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(root), OID_AUTO, "chassis_open",
+ CTLTYPE_U8 | CTLFLAG_RD, sc, 0, w83793g_case_sysctl, "CU",
+ "report if the chassis_open was latched");
+ return (0);
+}
+
+static int
+w83793g_detach(device_t dev)
+{
+ return (ENXIO);
+}
+
+static int
+w83793g_temp_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct w83793g_softc *sc = arg1;
+ int reg = arg2;
+ int temp;
+ int error;
+ int8_t t_reg;
+ uint8_t t_low;
+
+ error = w83793g_readreg(sc->sc_dev, reg, &t_reg);
+ if (error != 0)
+ return (error);
+
+ if (reg < WB_TD_BASE + WB_TD_COUNT) {
+ error = w83793g_readreg(sc->sc_dev, WB_TLOW, &t_low);
+ if (error != 0)
+ return (error);
+ } else
+ t_low = 0;
+
+ temp = (int)t_reg * 100;
+ temp += (t_low >> (2 * (reg - WB_TD_BASE)) & 0x3) * 25;
+ temp += 27315; /* Convert celsius to kelvin */
+
+ error = sysctl_handle_int(oidp, &temp, 0, req);
+
+ return (error);
+}
+
+static int
+w83793g_fan_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct w83793g_softc *sc = arg1;
+ int reg = arg2;
+ int count;
+ int error;
+ uint8_t reg_vals[2]; /* Fan count is 2 bytes */
+
+ error = iicdev_readfrom(sc->sc_dev, reg, reg_vals, sizeof(reg_vals),
+ IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ count = ((int)reg_vals[0] << 8) | reg_vals[1];
+ error = sysctl_handle_int(oidp, &count, 0, req);
+
+ return (error);
+}
+
+static int
+w83793g_voltage_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct w83793g_softc *sc = arg1;
+ const struct wb_vsens *sensor;
+ int index = arg2;
+ int volts;
+ int error;
+ uint8_t v_reg;
+ uint8_t v_low;
+
+ sensor = &voltages[index];
+ error = w83793g_readreg(sc->sc_dev, sensor->reg, &v_reg);
+ if (error != 0)
+ return (error);
+
+ volts = v_reg;
+ if (sensor->left_low != 0) {
+ volts <<= 2;
+ error = w83793g_readreg(sc->sc_dev, WB_VLOW, &v_low);
+ if (error != 0)
+ return (error);
+ volts |= (v_low >> (sensor->left_low - 1) & 0x3);
+ }
+
+ volts *= sensor->scale;
+ volts += sensor->add;
+
+ error = sysctl_handle_int(oidp, &volts, 0, req);
+
+ return (error);
+}
+
+static int
+w83793g_case_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct w83793g_softc *sc = arg1;
+ int error;
+ uint8_t reg;
+ bool chassis;
+
+ error = w83793g_readreg(sc->sc_dev, INT_STS4, &reg);
+ if (error != 0)
+ return (error);
+
+ chassis = ((reg & CHASSIS) != 0);
+
+ return (sysctl_handle_bool(oidp, &chassis, 0, req));
+}
diff --git a/sys/modules/i2c/Makefile b/sys/modules/i2c/Makefile
--- a/sys/modules/i2c/Makefile
+++ b/sys/modules/i2c/Makefile
@@ -32,7 +32,8 @@
rv3032 \
rx8803 \
tca64xx \
- tmp461
+ tmp461 \
+ w83793g
.endif
.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
diff --git a/sys/modules/i2c/w83793g/Makefile b/sys/modules/i2c/w83793g/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/i2c/w83793g/Makefile
@@ -0,0 +1,14 @@
+.PATH: ${SRCTOP}/sys/dev/iicbus/sensor/
+KMOD = w83793g
+SRCS = w83793g.c
+
+# Generated files...
+SRCS+= \
+ bus_if.h \
+ clock_if.h \
+ device_if.h \
+ iicbus_if.h \
+ opt_platform.h \
+ ofw_bus_if.h \
+
+.include <bsd.kmod.mk>

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