Module device_node 

Bluetooth HCI device node for userland access

Provides /dev/bluetooth/hci0 as a device node that allows the BlueZ userland shim to send HCI command packets and receive HCI event packets via the kernel Bluetooth HCI driver.

The device node acts as a bridge between the userland D-Bus daemon (userland/bluez/bluez-hci-bridge.cpp) and the kernel HCI controller (kernel/src/drivers/bluetooth/hci.rs).

Protocol:

• Write: userland sends H4 HCI command packets (type=0x01 + header + params)
• Read: userland receives H4 HCI event packets (type=0x04 + header + params)
• Ioctl: adapter info queries and scan mode configuration

Structs

BtDeviceHandle

Handle returned by bt_device_open

Constants

BT_DEVICE_PATH

Device node path

BT_IOCTL_GET_ADAPTER_INFO

Get adapter info (address, name, state)

BT_IOCTL_RESET

Reset the HCI controller

BT_IOCTL_SET_SCAN_MODE

Set scan mode (0=off, 1=inquiry, 2=page, 3=both)

Functions

bt_device_close

Close the Bluetooth HCI device node handle.

bt_device_ioctl

Perform an ioctl on the Bluetooth device node.

bt_device_open

Open the Bluetooth HCI device node. Returns a handle for subsequent read/write/ioctl operations.

bt_device_read

Read the next HCI event from the kernel event queue.

bt_device_write

Write an HCI command packet to the kernel HCI layer.

init

Initialize the Bluetooth device node subsystem. Creates the /dev/bluetooth/hci0 device node entry. Must be called after the Bluetooth controller is initialized.

pending_event_count

Get the number of pending events in the queue.

push_event

Push an HCI event into the device node’s event queue.