Bluetooth: Add support for virtio transport driver

This adds support for Bluetooth HCI transport over virtio.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

include/uapi/linux/virtio_bt.h

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#ifndef _UAPI_LINUX_VIRTIO_BT_H
+#define _UAPI_LINUX_VIRTIO_BT_H
+
+#include <linux/virtio_types.h>
+
+/* Feature bits */
+#define VIRTIO_BT_F_VND_HCI	0	/* Indicates vendor command support */
+#define VIRTIO_BT_F_MSFT_EXT	1	/* Indicates MSFT vendor support */
+#define VIRTIO_BT_F_AOSP_EXT	2	/* Indicates AOSP vendor support */
+
+enum virtio_bt_config_type {
+	VIRTIO_BT_CONFIG_TYPE_PRIMARY	= 0,
+	VIRTIO_BT_CONFIG_TYPE_AMP	= 1,
+};
+
+enum virtio_bt_config_vendor {
+	VIRTIO_BT_CONFIG_VENDOR_NONE	= 0,
+	VIRTIO_BT_CONFIG_VENDOR_ZEPHYR	= 1,
+	VIRTIO_BT_CONFIG_VENDOR_INTEL	= 2,
+	VIRTIO_BT_CONFIG_VENDOR_REALTEK	= 3,
+};
+
+struct virtio_bt_config {
+	__u8  type;
+	__u16 vendor;
+	__u16 msft_opcode;
+} __attribute__((packed));
+
+#endif /* _UAPI_LINUX_VIRTIO_BT_H */