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.\" $Id: ng_ubt.4,v 1.2 2003/03/22 23:44:32 max Exp $
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.Dd June 14, 2002
.Dt NG_UBT 4
.Os
.Sh NAME
.Nm ubt
.Nd Netgraph node type that is also a driver for Bluetooth USB devices
.Sh SYNOPSIS
.In sys/types.h
.In ng_ubt.h
.Sh DESCRIPTION
The
.Nm
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.
.Pp
The node has a single hook called
.Dv 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 indicator if device did not send it. HCI frames received
on
.Dv hook
are transmitted out. The node will drop HCI frame indicator unless device
requires it to be present.
.Sh HOOKS
This node type supports the following hooks:
.Pp
.Bl -tag -width foobar
.It Dv hook
single HCI frame contained in single
.Dv mbuf
structure.
.El
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width foo
.It Dv NGM_UBT_NODE_GET_DEBUG
Returns an integer containing the current debug level for the node.
.It Dv NGM_UBT_NODE_SET_DEBUG
This command takes an integer argument and sets current debug level
for the node.
.It Dv 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.
.It Dv 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.
.It Dv NGM_UBT_NODE_GET_STAT
Returns various statistic information for the node, such as: number of
bytes (frames) sent, number of bytes (frames) received and number of
input (output) errors.
.It Dv NGM_UBT_NODE_RESET_STAT
Reset all statistic counters to zero.
.It Dv 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.
.El
.Sh DEVICE NODES INTERFACE
The
.Nm
driver can create or destroy endpoint device nodes on request. This
feature can be used to implement external firmware download utility.
.Pp
The control transfers can only happen on the control endpoint which
is always endpoint 0. Control request are issued by
.Xr ioctl 2
calls.
.Pp
Only incoming transfers are supported on an interrupt endpoint. To perform I/O
on an interrupt endpoint
.Xr read 2
should be used.  All I/O operations on a interrupt endpoint are unbuffered.
.Pp
The bulk transfers can be in or out depending on the endpoint. To perform
I/O on a bulk endpoint
.Xr read 2
and
.Xr write 2
should be used. All I/O operations on a bulk endpoint are unbuffered.
.Pp
The control endpoint (endpoint 0) handles the following
.Xr ioctl 2
calls:
.Bl -tag -width foo
.It Dv USB_GET_DEVICE_DESC Pq Vt usb_device_descriptor_t
Return the device descriptor.
.It Dv USB_GET_STRING_DESC Pq Vt "struct usb_string_desc"
Get a string descriptor for the given language ID and
string index.
.Bd -literal
struct usb_string_desc {
        int                     string_index;
        int                     language_id;
        usb_string_descriptor_t desc;
};
.Ed
.It Dv USB_DO_REQUEST Pq Vt "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
.Va data .
The size of the transferred data is determined from the
.Va request .
The
.Va addr
field is ignored in this call.
The
.Va flags
field can be used to flag that the request is allowed to
be shorter than the requested size, and the
.Va actlen
will contain the actual size on completion.
.Bd -literal
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 */
};
.Ed
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.
.It Dv USB_GET_DEVICEINFO Pq Vt "struct usb_device_info"
Get an information summary for the device. This call will not issue any USB
transactions.
.El
.Sh SHUTDOWN
This node shuts down when the corresponding USB device is un-plugged.
.Sh BUGS
Isochronous USB transfers are broken. It means that USB device will not be able
to transfer SCO data (voice). USB interrupt transfers are implemented as bulk-in
transfers (not really a bug).
.Sh FILES
.Bl -tag -width ".Pa /dev/ubt Ns Ar N Ns Pa \&. Ns Ar EE" -compact
.It Pa /dev/ubt Ns Ar N Ns Pa \&. Ns Ar EE
Endpoint
.Ar EE
of device
.Ar N .
.El
.Sh SEE ALSO
.Xr usb 4 ,
.Xr ugen 4 ,
.Xr netgraph 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Nm
node type was implemented in
.Fx 5.0 .
.Sh AUTHORS
.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com