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NG_UBT(4)	       FreeBSD Kernel Interfaces Manual		     NG_UBT(4)

NAME
     ng_ubt -- Netgraph	node type that is also a driver	for Bluetooth USB
     devices

SYNOPSIS
     #include <sys/types.h>
     #include <netgraph/bluetooth/include/ng_ubt.h>

DESCRIPTION
     The ubt node type is both a persistent Netgraph node type and a driver
     for Bluetooth USB devices.	 It implements a Bluetooth USB transport layer
     as	per chapter H2 of the Bluetooth	Specification Book v1.1.  A new	node
     is	created	when supported USB device is plugged.

     The node has a single hook	called hook.  Incoming bytes received on the
     device are	re-assembled into HCI frames (according	to the length).	 Full
     HCI frames	are sent out on	the hook.  The node will add HCI frame indica-
     tor if device did not send	it.  HCI frames	received on hook are transmit-
     ted out.  The node	will drop HCI frame indicator unless device requires
     it	to be present.

HOOKS
     This node type supports the following hooks:

     hook    single HCI	frame contained	in single mbuf structure.

CONTROL	MESSAGES
     This node type supports the generic control messages, plus	the following:

     NGM_UBT_NODE_GET_DEBUG
	     Returns an	integer	containing the current debug level for the
	     node.

     NGM_UBT_NODE_SET_DEBUG
	     This command takes	an integer argument and	sets current debug
	     level for the node.

     NGM_UBT_NODE_GET_QLEN
	     This command takes	a parameter that specifies queue number	and
	     returns current maximal length of the queue for the node.

     NGM_UBT_NODE_SET_QLEN
	     This command takes	two parameters that specify queue number and
	     maximum length of the queue and sets maximal length of the	queue
	     for the node.

     NGM_UBT_NODE_GET_STAT
	     Returns various statistic information for the node, such as: num-
	     ber of bytes (frames) sent, number	of bytes (frames) received and
	     number of input (output) errors.

     NGM_UBT_NODE_RESET_STAT
	     Reset all statistic counters to zero.

     NGM_UBT_NODE_DEV_NODES
	     This command takes	single integer parameter.  If the parameter's
	     value is not zero,	then the driver	will create device nodes for
	     the control, interrupt, bulk-in and bulk-out endpoints.  If the
	     parameter's value is zero,	then the driver	will destroy device
	     nodes for the endpoints.  The device nodes	interface is mutually
	     exclusive with Netgraph interface.

DEVICE NODES INTERFACE
     The ubt driver can	create or destroy endpoint device nodes	on request.
     This feature can be used to implement external firmware download utility.

     The control transfers can only happen on the control endpoint which is
     always endpoint 0.	 Control requests are issued by	ioctl(2) calls.

     Only incoming transfers are supported on an interrupt endpoint.  To per-
     form I/O on an interrupt endpoint,	read(2)	should be used.	 All I/O oper-
     ations on an interrupt endpoint are unbuffered.

     The bulk transfers	can be in or out depending on the endpoint.  To	per-
     form I/O on a bulk	endpoint, read(2) and write(2) should be used.	All
     I/O operations on a bulk endpoint are unbuffered.

     The control endpoint (endpoint 0) handles the following ioctl(2) calls:

     USB_GET_DEVICE_DESC (usb_device_descriptor_t)
	     Return the	device descriptor.

     USB_GET_STRING_DESC (struct usb_string_desc)
	     Get a string descriptor for the given language ID and string
	     index.

	     struct usb_string_desc {
		     int		     string_index;
		     int		     language_id;
		     usb_string_descriptor_t desc;
	     };

     USB_DO_REQUEST (struct usb_ctl_request)
	     Send a USB	request	to the device on the control endpoint.	Any
	     data sent to/from the device is located at	data.  The size	of the
	     transferred data is determined from the request.  The addr	field
	     is	ignored	in this	call.  The flags field can be used to flag
	     that the request is allowed to be shorter than the	requested
	     size, and the actlen will contain the actual size on completion.

	     struct usb_ctl_request {
		     int		  addr;
		     usb_device_request_t request;
		     void		  *data;
		     int		  flags;
	     #define USBD_SHORT_XFER_OK	  0x04	  /* allow short reads */
		     int		  actlen; /* actual length transferred */
	     };
	     This is a dangerous operation in that it can perform arbitrary
	     operations	on the device.	Some of	the most dangerous (e.g.,
	     changing the device address) are not allowed.

     USB_GET_DEVICEINFO	(struct	usb_device_info)
	     Get an information	summary	for the	device.	 This call will	not
	     issue any USB transactions.

SHUTDOWN
     This node shuts down when the corresponding USB device is un-plugged.

BUGS
     Isochronous USB transfers are broken.  It means that USB device will not
     be	able to	transfer SCO data (voice).  USB	interrupt transfers are	imple-
     mented as bulk-in transfers (not really a bug).

FILES
     /dev/ubtN.EE  Endpoint EE of device N.

SEE ALSO
     netgraph(4), ugen(4), usb(4), ngctl(8)

HISTORY
     The ubt node type was implemented in FreeBSD 5.0.

AUTHORS
     Maksim Yevmenkin <m_evmenkin@yahoo.com>

FreeBSD	10.1			 June 14, 2002			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | DEVICE NODES INTERFACE | SHUTDOWN | BUGS | FILES | SEE ALSO | HISTORY | AUTHORS

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