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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -4267,6 +4267,7 @@
netgraph/bluetooth/common/ng_bluetooth.c optional netgraph_bluetooth
netgraph/bluetooth/drivers/ubt/ng_ubt.c optional netgraph_bluetooth_ubt usb
netgraph/bluetooth/drivers/ubt/ng_ubt_intel.c optional netgraph_bluetooth_ubt usb
+netgraph/bluetooth/drivers/ubt/ng_ubt_rtl.c optional netgraph_bluetooth_ubt usb
netgraph/bluetooth/drivers/ubtbcmfw/ubtbcmfw.c optional netgraph_bluetooth_ubtbcmfw usb
netgraph/bluetooth/hci/ng_hci_cmds.c optional netgraph_bluetooth_hci
netgraph/bluetooth/hci/ng_hci_evnt.c optional netgraph_bluetooth_hci
diff --git a/sys/modules/netgraph/bluetooth/ubt/Makefile b/sys/modules/netgraph/bluetooth/ubt/Makefile
--- a/sys/modules/netgraph/bluetooth/ubt/Makefile
+++ b/sys/modules/netgraph/bluetooth/ubt/Makefile
@@ -6,7 +6,7 @@
-I${SRCTOP}/sys/netgraph/bluetooth/drivers/ubt
KMOD= ng_ubt
-SRCS= ng_ubt.c ng_ubt_intel.c opt_bus.h opt_usb.h device_if.h \
- bus_if.h usb_if.h usbdevs.h
+SRCS= ng_ubt.c ng_ubt_intel.c ng_ubt_rtl.c opt_bus.h opt_usb.h \
+ device_if.h bus_if.h usb_if.h usbdevs.h
.include <bsd.kmod.mk>
diff --git a/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c
--- a/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c
+++ b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c
@@ -625,6 +625,9 @@
if (usbd_lookup_id_by_uaa(ubt_ignore_devs,
sizeof(ubt_ignore_devs), uaa) == 0)
return (ENXIO);
+ if (usbd_lookup_id_by_uaa(ubt_rtl_devs,
+ ubt_rtl_devs_sizeof, uaa) == 0)
+ return (ENXIO);
id = usbd_lookup_id_by_info(ubt_devs,
sizeof(ubt_devs), &uaa->info);
diff --git a/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_rtl.c b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_rtl.c
new file mode 100644
--- /dev/null
+++ b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_rtl.c
@@ -0,0 +1,265 @@
+/*
+ * ng_ubt_rtl.c
+ */
+
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Vladimir Kondratyev <wulf@FreeBSD.org>
+ * Copyright (c) 2023 Future Crew LLC.
+ *
+ * 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.
+ */
+
+/*
+ * Attempt to initialize FreeBSD bluetooth stack while Realtek 87XX/88XX USB
+ * device is in bootloader mode locks the adapter hardly so it requires power
+ * on/off cycle to restore. This driver blocks ng_ubt attachment until
+ * operational firmware is loaded by rtlbtfw utility thus avoiding the lock up.
+ */
+
+#include <sys/types.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/taskqueue.h>
+
+#include "usbdevs.h"
+#include <dev/usb/usb.h>
+#include <dev/usb/usbdi.h>
+#define USB_DEBUG_VAR usb_debug
+#include <dev/usb/usb_debug.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_parse.h>
+#include <netgraph/bluetooth/include/ng_bluetooth.h>
+#include <netgraph/bluetooth/include/ng_hci.h>
+#include <netgraph/bluetooth/include/ng_ubt.h>
+#include <netgraph/bluetooth/drivers/ubt/ng_ubt_var.h>
+
+static device_probe_t ubt_rtl_probe;
+
+/*
+ * List of supported bluetooth devices. If you add a new device PID here ensure
+ * that it is blacklisted in ng_ubt.c and is supported by rtlbtfw utility.
+ */
+
+const STRUCT_USB_HOST_ID ubt_rtl_devs[] =
+{
+ /* Generic Realtek Bluetooth class devices */
+ { USB_VENDOR(USB_VENDOR_REALTEK),
+ USB_IFACE_CLASS(UDCLASS_WIRELESS),
+ USB_IFACE_SUBCLASS(UDSUBCLASS_RF),
+ USB_IFACE_PROTOCOL(UDPROTO_BLUETOOTH) },
+
+ /* Realtek 8821CE Bluetooth devices */
+ { USB_VPI(0x13d3, 0x3529, 0) },
+
+ /* Realtek 8822CE Bluetooth devices */
+ { USB_VPI(0x0bda, 0xb00c, 0) },
+ { USB_VPI(0x0bda, 0xc822, 0) },
+
+ /* Realtek 8822CU Bluetooth devices */
+ { USB_VPI(0x13d3, 0x3549, 0) },
+
+ /* Realtek 8852AE Bluetooth devices */
+ { USB_VPI(0x0bda, 0x2852, 0) },
+ { USB_VPI(0x0bda, 0xc852, 0) },
+ { USB_VPI(0x0bda, 0x385a, 0) },
+ { USB_VPI(0x0bda, 0x4852, 0) },
+ { USB_VPI(0x04c5, 0x165c, 0) },
+ { USB_VPI(0x04ca, 0x4006, 0) },
+ { USB_VPI(0x0cb8, 0xc549, 0) },
+
+ /* Realtek 8852CE Bluetooth devices */
+ { USB_VPI(0x04ca, 0x4007, 0) },
+ { USB_VPI(0x04c5, 0x1675, 0) },
+ { USB_VPI(0x0cb8, 0xc558, 0) },
+ { USB_VPI(0x13d3, 0x3587, 0) },
+ { USB_VPI(0x13d3, 0x3586, 0) },
+ { USB_VPI(0x13d3, 0x3592, 0) },
+
+ /* Realtek 8852BE Bluetooth devices */
+ { USB_VPI(0x0cb8, 0xc559, 0) },
+ { USB_VPI(0x0bda, 0x887b, 0) },
+ { USB_VPI(0x13d3, 0x3571, 0) },
+
+ /* Realtek 8723AE Bluetooth devices */
+ { USB_VPI(0x0930, 0x021d, 0) },
+ { USB_VPI(0x13d3, 0x3394, 0) },
+
+ /* Realtek 8723BE Bluetooth devices */
+ { USB_VPI(0x0489, 0xe085, 0) },
+ { USB_VPI(0x0489, 0xe08b, 0) },
+ { USB_VPI(0x04f2, 0xb49f, 0) },
+ { USB_VPI(0x13d3, 0x3410, 0) },
+ { USB_VPI(0x13d3, 0x3416, 0) },
+ { USB_VPI(0x13d3, 0x3459, 0) },
+ { USB_VPI(0x13d3, 0x3494, 0) },
+
+ /* Realtek 8723BU Bluetooth devices */
+ { USB_VPI(0x7392, 0xa611, 0) },
+
+ /* Realtek 8723DE Bluetooth devices */
+ { USB_VPI(0x0bda, 0xb009, 0) },
+ { USB_VPI(0x2ff8, 0xb011, 0) },
+
+ /* Realtek 8761BUV Bluetooth devices */
+ { USB_VPI(0x2357, 0x0604, 0) },
+ { USB_VPI(0x0b05, 0x190e, 0) },
+ { USB_VPI(0x2550, 0x8761, 0) },
+ { USB_VPI(0x0bda, 0x8771, 0) },
+ { USB_VPI(0x6655, 0x8771, 0) },
+ { USB_VPI(0x7392, 0xc611, 0) },
+ { USB_VPI(0x2b89, 0x8761, 0) },
+
+ /* Realtek 8821AE Bluetooth devices */
+ { USB_VPI(0x0b05, 0x17dc, 0) },
+ { USB_VPI(0x13d3, 0x3414, 0) },
+ { USB_VPI(0x13d3, 0x3458, 0) },
+ { USB_VPI(0x13d3, 0x3461, 0) },
+ { USB_VPI(0x13d3, 0x3462, 0) },
+
+ /* Realtek 8822BE Bluetooth devices */
+ { USB_VPI(0x13d3, 0x3526, 0) },
+ { USB_VPI(0x0b05, 0x185c, 0) },
+
+ /* Realtek 8822CE Bluetooth devices */
+ { USB_VPI(0x04ca, 0x4005, 0) },
+ { USB_VPI(0x04c5, 0x161f, 0) },
+ { USB_VPI(0x0b05, 0x18ef, 0) },
+ { USB_VPI(0x13d3, 0x3548, 0) },
+ { USB_VPI(0x13d3, 0x3549, 0) },
+ { USB_VPI(0x13d3, 0x3553, 0) },
+ { USB_VPI(0x13d3, 0x3555, 0) },
+ { USB_VPI(0x2ff8, 0x3051, 0) },
+ { USB_VPI(0x1358, 0xc123, 0) },
+ { USB_VPI(0x0bda, 0xc123, 0) },
+ { USB_VPI(0x0cb5, 0xc547, 0) },
+};
+const size_t ubt_rtl_devs_sizeof = sizeof(ubt_rtl_devs);
+
+/*
+ * List of lmp_subversion values that correspond to Realtek firmwares
+ * incompatible with ng_ubt driver. Alternative firmware for these devices
+ * has to be loaded with rtlbtfw utility. That will trigger lmp_subversion
+ * change to different value.
+ */
+static const uint16_t ubt_rtl_lmp_subvers[] = {
+ 0x8703, 0x1200, 0x8723, 0x8821,
+ 0x8761, 0x8822, 0x8852, 0x8851,
+};
+
+/*
+ * Execute generic HCI command and return response in provided buffer.
+ */
+
+static usb_error_t
+ubt_rtl_do_hci_request(struct usb_device *udev, uint16_t opcode,
+ void *resp, uint8_t resp_len)
+{
+#define UBT_RTL_HCICMD_TIMEOUT 2000 /* ms */
+ struct ubt_hci_event_command_compl *evt;
+ struct ubt_hci_cmd cmd;
+ usb_error_t error;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.opcode = htole16(opcode);
+ evt = malloc(offsetof(struct ubt_hci_event_command_compl, data) +
+ resp_len, M_TEMP, M_ZERO | M_WAITOK);
+ evt->header.event = NG_HCI_EVENT_COMMAND_COMPL;
+ evt->header.length = resp_len + UBT_HCI_EVENT_COMPL_HEAD_SIZE;
+
+ error = ubt_do_hci_request(udev, &cmd, evt, UBT_RTL_HCICMD_TIMEOUT);
+ if (error != USB_ERR_NORMAL_COMPLETION)
+ goto exit;
+
+ if (evt->header.event == NG_HCI_EVENT_COMMAND_COMPL &&
+ evt->header.length == resp_len + UBT_HCI_EVENT_COMPL_HEAD_SIZE)
+ memcpy(resp, evt->data, resp_len);
+ else
+ error = USB_ERR_INVAL;
+exit:
+ free(evt, M_TEMP);
+ return (error);
+}
+
+/*
+ * Probe for a Realtek 87XX/88XX USB Bluetooth device.
+ */
+
+static int
+ubt_rtl_probe(device_t dev)
+{
+ struct usb_attach_arg *uaa = device_get_ivars(dev);
+ ng_hci_read_local_ver_rp ver;
+ unsigned int i;
+ int error;
+
+ if (uaa->usb_mode != USB_MODE_HOST)
+ return (ENXIO);
+
+ if (uaa->info.bIfaceIndex != 0)
+ return (ENXIO);
+
+ error = usbd_lookup_id_by_uaa(ubt_rtl_devs, sizeof(ubt_rtl_devs), uaa);
+ if (error != 0)
+ return (error);
+
+ if (ubt_rtl_do_hci_request(uaa->device,
+ NG_HCI_OPCODE(NG_HCI_OGF_INFO, NG_HCI_OCF_READ_LOCAL_VER),
+ &ver, sizeof(ver)) != USB_ERR_NORMAL_COMPLETION)
+ return (ENXIO);
+
+ DPRINTFN(2, "hci_version 0x%02x\n", ver.hci_version);
+ DPRINTFN(2, "hci_revision 0x%04x\n", le16toh(ver.hci_revision));
+ DPRINTFN(2, "lmp_version 0x%02x\n", ver.lmp_version);
+ DPRINTFN(2, "lmp_subversion 0x%04x\n", le16toh(ver.lmp_subversion));
+
+ for (i = 0; i < nitems(ubt_rtl_lmp_subvers); i++)
+ if (le16toh(ver.lmp_subversion) == ubt_rtl_lmp_subvers[i])
+ return (ENXIO);
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+/*
+ * Module interface. Attach and detach methods, netgraph node type
+ * registration and PNP string are inherited from ng_ubt.c driver.
+ */
+
+static device_method_t ubt_rtl_methods[] =
+{
+ DEVMETHOD(device_probe, ubt_rtl_probe),
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_1(ubt, ubt_rtl_driver, ubt_rtl_methods,
+ sizeof(struct ubt_softc), ubt_driver);
+DRIVER_MODULE(ng_ubt_rtl, uhub, ubt_rtl_driver, 0, 0);
+MODULE_VERSION(ng_ubt_rtl, NG_BLUETOOTH_VERSION);
+MODULE_DEPEND(ng_ubt_rtl, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
+MODULE_DEPEND(ng_ubt_rtl, ng_hci, NG_BLUETOOTH_VERSION, NG_BLUETOOTH_VERSION, NG_BLUETOOTH_VERSION);
+MODULE_DEPEND(ng_ubt_rtl, usb, 1, 1, 1);
diff --git a/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_var.h b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_var.h
--- a/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_var.h
+++ b/sys/netgraph/bluetooth/drivers/ubt/ng_ubt_var.h
@@ -164,6 +164,9 @@
usb_error_t ubt_do_hci_request(struct usb_device *, struct ubt_hci_cmd *,
void *, usb_timeout_t);
+extern const STRUCT_USB_HOST_ID ubt_rtl_devs[];
+extern const size_t ubt_rtl_devs_sizeof;
+
extern driver_t ubt_driver;
#endif /* ndef _NG_UBT_VAR_H_ */

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