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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 August 6, 1998
-.Dt IICBUS 4
-.Os FreeBSD
-.Sh NAME
-.Nm iicbus
-.Nd
-I2C bus system
-.Sh SYNOPSIS
-.Cd "controller iicbus0"
-.Cd "controller iicbb0"
-.Pp
-.Cd "device iic0 at iicbus?"
-.Cd "device ic0 at iicbus?"
-.Cd "device iicsmb0 at iicbus?"
-.Sh DESCRIPTION
-The
-.Em iicbus
-system provides a uniform, modular and architecture-independent
-system for the implementation of drivers to control various I2C devices
-and to utilize different I2C controllers.
-.Sh I2C
-I2C is an acronym for Inter Integrated Circuit bus. The I2C bus was developed
-in the early 1980's by Philips semiconductors. It's purpose was to provide an
-easy way to connect a CPU to peripheral chips in a TV-set.
-.Pp
-The BUS physically consists of 2 active wires and a ground connection.
-The active wires, SDA and SCL, are both bidirectional. Where SDA is the
-Serial DAta line and SCL is the Serial CLock line.
-
-Every component hooked up to the bus has its own unique address whether it
-is a CPU, LCD driver, memory, or complex function chip. Each of these chips
-can act as a receiver and/or transmitter depending on it's functionality.
-Obviously an LCD driver is only a receiver, while a memory or I/O chip can
-both be transmitter and receiver. Furthermore there may be one or
-more BUS MASTER's.
-
-The BUS MASTER is the chip issuing the commands on the BUS. In the I2C protocol
-specification it is stated that the IC that initiates a data transfer on the
-bus is considered the BUS MASTER. At that time all the others are regarded to
-as the BUS SLAVEs. As mentioned before, the IC bus is a Multi-MASTER BUS.
-This means that more than one IC capable of initiating data transfer can be
-connected to it.
-.Sh DEVICES
-Some I2C device drivers are available:
-.Pp
-.Bl -column "Device drivers" -compact
-.It Em Devices Ta Em Description
-.It Sy iic Ta "general i/o operation"
-.It Sy ic Ta "network IP interface"
-.It Sy iicsmb Ta "I2C to SMB software bridge"
-.El
-.Sh INTERFACES
-The I2C protocol may be implemented by hardware or software. Software
-interfaces rely on very simple hardware, usually two lines
-twiddled by 2 registers. Hardware interfaces are more intelligent and receive
-8-bit characters they write to the bus according to the I2C protocol.
-
-I2C interfaces may act on the bus as slave devices, allowing spontaneous
-bidirectional communications, thanks to the mutli-master capabilities of the
-I2C protocol.
-
-Some I2C interfaces are available:
-.Pp
-.Bl -column "Interface drivers" -compact
-.It Em Interface Ta Em Description
-.It Sy pcf Ta "Philips PCF8584 master/slave interface"
-.It Sy iicbb Ta "generic bit-banging master-only driver"
-.It Sy lpbb Ta "parallel port specific bit-banging interface"
-.It Sy bktr Ta "Brooktree848 video chipset, hardware and software master-only interface"
-.El
-.Sh SEE ALSO
-.Xr pcf 4 ,
-.Xr iicbb 4 ,
-.Xr lpbb 4
-.Sh HISTORY
-The
-.Nm
-manual page first appeared in
-.Fx 3.0 .
-.Sh AUTHOR
-This
-manual page was written by
-.An Nicolas Souchu .