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diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -8,6 +8,7 @@
acpi.4 \
${_acpi_asus.4} \
${_acpi_asus_wmi.4} \
+ ${_acpi_cros_tbmc.4} \
${_acpi_dock.4} \
${_acpi_fujitsu.4} \
${_acpi_hp.4} \
@@ -775,6 +776,7 @@
.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
_acpi_asus.4= acpi_asus.4
_acpi_asus_wmi.4= acpi_asus_wmi.4
+_acpi_cros_tbmc.4= acpi_cros_tbmc.4
_acpi_dock.4= acpi_dock.4
_acpi_fujitsu.4=acpi_fujitsu.4
_acpi_hp.4= acpi_hp.4
diff --git a/share/man/man4/acpi_cros_tbmc.4 b/share/man/man4/acpi_cros_tbmc.4
new file mode 100644
--- /dev/null
+++ b/share/man/man4/acpi_cros_tbmc.4
@@ -0,0 +1,67 @@
+.\" Copyright (c) 2023 Val Packett
+.\"
+.\" 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.
+.\"
+.Dd February 4, 2023
+.Dt ACPI_CROS_TBMC 4
+.Os
+.Sh NAME
+.Nm acpi_cros_tbmc
+.Nd "ACPI tablet mode switch driver for Chromebooks"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device acpi_cros_tbmc"
+.Cd "device evdev"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+acpi_cros_tbmc_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for tablet mode detection for ChromeOS convertibles.
+.Pp
+The
+.Pa /dev/input/eventX
+device presents the switch as an
+.Ar evdev
+type device.
+.Sh SEE ALSO
+.Xr acpi 4
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Fx 14.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Val Packett Aq Mt val@packett.cool
diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -784,6 +784,7 @@
dev/acpi_support/acpi_wmi.c optional acpi_wmi acpi
dev/acpi_support/acpi_asus.c optional acpi_asus acpi
dev/acpi_support/acpi_asus_wmi.c optional acpi_asus_wmi acpi
+dev/acpi_support/acpi_cros_tbmc.c optional acpi_cros_tbmc acpi
dev/acpi_support/acpi_fujitsu.c optional acpi_fujitsu acpi
dev/acpi_support/acpi_hp.c optional acpi_hp acpi
dev/acpi_support/acpi_ibm.c optional acpi_ibm acpi
diff --git a/sys/dev/acpi_support/acpi_cros_tbmc.c b/sys/dev/acpi_support/acpi_cros_tbmc.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/acpi_support/acpi_cros_tbmc.c
@@ -0,0 +1,177 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Val Packett <val@packett.cool>
+ *
+ * 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/cdefs.h>
+
+#include "opt_acpi.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <machine/cpufunc.h>
+
+#include <contrib/dev/acpica/include/acpi.h>
+#include <contrib/dev/acpica/include/accommon.h>
+
+#include "acpi_if.h"
+#include <sys/module.h>
+#include <dev/evdev/evdev.h>
+#include <dev/evdev/input.h>
+#include <dev/acpica/acpivar.h>
+
+ACPI_MODULE_NAME("CROS_TBMC")
+
+struct acpi_cros_tbmc_softc {
+ device_t dev;
+ ACPI_HANDLE handle;
+
+ struct evdev_dev *evdev;
+};
+
+static void
+acpi_cros_tbmc_read_status(struct acpi_cros_tbmc_softc *sc)
+{
+ int32_t val = 0;
+
+ ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+
+ if (ACPI_FAILURE(acpi_GetInteger(sc->handle, "TBMC", &val))) {
+ device_printf(sc->dev, "ACPI failure\n");
+ return;
+ }
+
+ evdev_push_sw(sc->evdev, SW_TABLET_MODE, val);
+ evdev_sync(sc->evdev);
+}
+
+static void
+acpi_cros_tbmc_notify(ACPI_HANDLE h, UINT32 notify, void *context)
+{
+ device_t dev = context;
+ struct acpi_cros_tbmc_softc *sc = device_get_softc(dev);
+
+ ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify);
+
+ if (notify != 0x80)
+ device_printf(dev, "Unknown notify\n");
+
+ acpi_cros_tbmc_read_status(sc);
+}
+
+static int
+acpi_cros_tbmc_resume(device_t dev)
+{
+ struct acpi_cros_tbmc_softc *sc = device_get_softc(dev);
+
+ ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+
+ acpi_cros_tbmc_read_status(sc);
+
+ return (0);
+}
+
+static char *cros_tbmc_ids[] = {"GOOG0006", NULL};
+
+static int
+acpi_cros_tbmc_probe(device_t dev)
+{
+ int rv;
+
+ if (acpi_disabled("cros_tbmc") ||
+ device_get_unit(dev) != 0)
+ return (ENXIO);
+
+ rv = ACPI_ID_PROBE(device_get_parent(dev), dev, cros_tbmc_ids, NULL);
+
+ if (rv <= 0)
+ device_set_desc(dev, "Chromebook Tablet Mode Switch");
+
+ return (rv);
+}
+
+static int
+acpi_cros_tbmc_attach(device_t dev)
+{
+ struct acpi_cros_tbmc_softc *sc;
+
+ ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+ sc->handle = acpi_get_handle(dev);
+
+ sc->evdev = evdev_alloc();
+ evdev_set_name(sc->evdev, device_get_desc(dev));
+ evdev_set_phys(sc->evdev, device_get_nameunit(dev));
+ evdev_set_id(sc->evdev, BUS_HOST, 0, 0, 1);
+ evdev_support_event(sc->evdev, EV_SYN);
+ evdev_support_event(sc->evdev, EV_SW);
+ evdev_support_sw(sc->evdev, SW_TABLET_MODE);
+
+ if (evdev_register(sc->evdev))
+ return (ENXIO);
+
+ AcpiInstallNotifyHandler(sc->handle, ACPI_ALL_NOTIFY,
+ acpi_cros_tbmc_notify, dev);
+
+ acpi_cros_tbmc_read_status(sc);
+
+ return (0);
+}
+
+static int
+acpi_cros_tbmc_detach(device_t dev)
+{
+ ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+
+ struct acpi_cros_tbmc_softc *sc = device_get_softc(dev);
+
+ AcpiRemoveNotifyHandler(sc->handle, ACPI_ALL_NOTIFY, acpi_cros_tbmc_notify);
+ evdev_free(sc->evdev);
+
+ return (0);
+}
+
+static device_method_t acpi_cros_tbmc_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, acpi_cros_tbmc_probe),
+ DEVMETHOD(device_attach, acpi_cros_tbmc_attach),
+ DEVMETHOD(device_detach, acpi_cros_tbmc_detach),
+ DEVMETHOD(device_resume, acpi_cros_tbmc_resume),
+
+ DEVMETHOD_END
+};
+
+static driver_t acpi_cros_tbmc_driver = {
+ "acpi_cros_tbmc",
+ acpi_cros_tbmc_methods,
+ sizeof(struct acpi_cros_tbmc_softc),
+};
+
+DRIVER_MODULE(acpi_cros_tbmc, acpi, acpi_cros_tbmc_driver, 0, 0);
+MODULE_DEPEND(acpi_cros_tbmc, acpi, 1, 1, 1);
+MODULE_DEPEND(acpi_cros_tbmc, evdev, 1, 1, 1);
diff --git a/sys/modules/acpi/Makefile b/sys/modules/acpi/Makefile
--- a/sys/modules/acpi/Makefile
+++ b/sys/modules/acpi/Makefile
@@ -1,6 +1,6 @@
# $FreeBSD$
-SUBDIR= acpi_asus acpi_asus_wmi acpi_dock acpi_fujitsu acpi_hp \
+SUBDIR= acpi_asus acpi_asus_wmi acpi_cros_tbmc acpi_dock acpi_fujitsu acpi_hp \
acpi_ged acpi_ibm acpi_panasonic acpi_sony acpi_toshiba \
acpi_video acpi_wmi aibs
diff --git a/sys/modules/acpi/acpi_cros_tbmc/Makefile b/sys/modules/acpi/acpi_cros_tbmc/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/acpi/acpi_cros_tbmc/Makefile
@@ -0,0 +1,5 @@
+.PATH: ${SRCTOP}/sys/dev/acpi_support
+KMOD= acpi_cros_tbmc
+SRCS= acpi_cros_tbmc.c opt_acpi.h device_if.h bus_if.h acpi_if.h
+
+.include <bsd.kmod.mk>

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