More I2C framework docs. See iicbus(4) for more info.

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+.\" Copyright (c) 1998, Nicolas Souchu
+.\" 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.
+.\"
+.\"
+.Dd October 25, 1998
+.Dt SMB 4
+.Os FreeBSD
+.Sh NAME
+.Nm smb
+.Nd
+SMB generic i/o device driver
+.Sh SYNOPSIS
+.Cd "device smb0 at smbus?"
+.Sh DESCRIPTION
+The
+.Em smb
+character device driver provides generic i/o to any
+.Xr smbus 4
+instance. In order to control SMB devices, use /dev/smb? with the
+following ioctls:
+.Pp
+.Bl -column "System Management Bus ioctls" -compact
+.It Em Ioctl Ta Em Description
+.It Sy SMB_QUICK_WRITE Ta "QuickWrite command"
+.It Sy SMB_QUICK_READ Ta "QuickRead command"
+.It Sy SMB_SENDB Ta "SendByte command"
+.It Sy SMB_RECVB Ta "ReceiveByte command"
+.It Sy SMB_WRITEB Ta "WriteByte command"
+.It Sy SMB_WRITEW Ta "WriteWord command"
+.It Sy SMB_READB Ta "ReadByte command"
+.It Sy SMB_READW Ta "ReadWord command"
+.It Sy SMB_PCALL Ta "ProcedureCall command"
+.It Sy SMB_BWRITE Ta "BlockWrite command"
+.It Sy SMB_BREAD Ta "BlockRead command"
+.El
+.Pp
+Using the write routine is equivalent to a SMB_WRITEW ioctl.
+.Pp
+.Sh SEE ALSO
+.Xr smbus 4
+.Sh HISTORY
+The
+.Nm
+manual page first appeared in
+.Fx 3.0 .
+.Sh AUTHOR
+This
+manual page was written by
+.An Nicolas Souchu .