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.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" $Id: ng_h4.4,v 1.1 2002/11/24 19:37:54 max Exp $
.\" $FreeBSD$
.\"
.Dd June 14, 2002
.Dt NG_H4 4
.Os
.Sh NAME
.Nm ng_h4
.Nd Netgraph node type that is also an H4 line discipline
.Sh SYNOPSIS
.In sys/types.h
.In sys/ttycom.h
.In netgraph/ng_message.h
.In netgraph/ng_h4.h
.Sh DESCRIPTION
The
.Nm h4
node type is both a persistent Netgraph node type and a H4 line
discipline.
It implements a Bluetooth HCI UART transport layer as
per chapter H4 of the Bluetooth Specification Book v1.1.
A new node is created when the corresponding line discipline,
.Dv H4DISC ,
is registered on a tty device (see
.Xr tty 4 ) .
.Pp
The node has a single hook called
.Dv hook .
Incoming bytes received on the tty device are re-assembled into
HCI frames (according to the length).
Full HCI frames are sent out on the hook.
HCI frames received on
.Dv hook
are transmitted out on the tty device.
No modification to the data is performed in either direction.
While the line discipline is installed on a tty, the normal
read and write operations are unavailable, returning
.Er EIO .
.Pp
Information about the node is available via the netgraph
.Xr ioctl 2
command
.Dv NGIOCGINFO .
This command returns a
.Vt "struct nodeinfo"
similar to the
.Dv NGM_NODEINFO
.Xr netgraph 4
control message.
.Sh HOOKS
This node type supports the following hooks:
.Bl -tag -width indent
.It Dv hook
single HCI frame contained in single
.Vt mbuf
structure.
.El
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width indent
.It Dv NGM_H4_NODE_RESET
Reset the node.
.It Dv NGM_H4_NODE_GET_STATE
Returns current receiving state for the node.
.It Dv NGM_H4_NODE_GET_DEBUG
Returns an integer containing the current debug level for the node.
.It Dv NGM_H4_NODE_SET_DEBUG
This command takes an integer argument and sets current debug level
for the node.
.It Dv NGM_H4_NODE_GET_QLEN
Returns current length of outgoing queue for the node.
.It Dv NGM_H4_NODE_SET_QLEN
This command takes an integer argument and sets maximum length of
outgoing queue for the node.
.It Dv NGM_H4_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_H4_NODE_RESET_STAT
Reset all statistic counters to zero.
.El
.Sh SHUTDOWN
This node shuts down when the corresponding device is closed
(or the line discipline is uninstalled on the device).
.Sh BUGS
This node still uses
.Xr spltty 9
to lock tty layer.
This is wrong.
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr netgraph 4 ,
.Xr tty 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Nm h4
node type was implemented in
.Fx 5.0 .
.Sh AUTHORS
.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com
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