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-.\"
-.\" Copyright (C) 2008-2009 Semihalf, Michal Hajduk and Bartlomiej Sieka
-.\" 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 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.
-.\"
-.\" $FreeBSD$ 
-.\"
-.Dd January 23, 2009
-.Dt I2C 8
-.Os
-.Sh NAME
-.Nm i2c
-.Nd test I2C bus and slave devices 
-.Sh SYNOPSIS
-.Nm
-.Cm -a Ar address
-.Op Fl f Ar device
-.Op Fl d Ar r|w
-.Op Fl w Ar 0|8|16
-.Op Fl o Ar offset
-.Op Fl c Ar count
-.Op Fl m Ar ss|rs|no
-.Op Fl b
-.Op Fl v
-.Nm
-.Cm -s
-.Op Fl f Ar device
-.Op Fl n Ar skip_addr
-.Op Fl v
-.Nm
-.Cm -r
-.Op Fl f Ar device
-.Op Fl v
-.Sh DESCRIPTION
-The
-.Nm
-utility can be used to perform raw data transfers (read or write) with devices
-on the I2C bus. It can also scan the bus for available devices and reset the
-I2C controller.
-.Pp
-The options are as follows:
-.Bl -tag -width ".Fl d Ar direction"
-.It Fl a Ar address
-7-bit address on the I2C device to operate on (hex).
-.It Fl b
-binary mode - when performing a read operation, the data read from the device
-is output in binary format on stdout; when doing a write, the binary data to
-be written to the device is read from stdin.
-.It Fl c Ar count
-number of bytes to transfer (dec).
-.It Fl d Ar r|w
-transfer direction: r - read, w - write.
-.It Fl f Ar device
-I2C bus to use (default is /dev/iic0).
-.It Fl m Ar ss|rs|no
-addressing mode, i.e., I2C bus operations performed after the offset for the
-transfer has been written to the device and before the actual read/write
-operation. rs - repeated start; ss - stop start; no - none.
-.It Fl n Ar skip_addr
-skip address - address(es) to be skipped during bus scan.
-There are two ways to specify addresses to ignore: by range 'a..b' or
-using selected addresses 'a:b:c'. This option is available only when "-s" is
-used.
-.It Fl o Ar offset
-offset within the device for data transfer (hex).
-.It Fl r
-reset the controller.
-.It Fl s
-scan the bus for devices.
-.It Fl v
-be verbose
-.It Fl w Ar 0|8|16
-device addressing width (in bits).
-.El
-.Sh WARNINGS
-Great care must be taken when manipulating slave I2C devices with the
-.Nm
-utility. Often times important configuration data for the system is kept in
-non-volatile but write enabled memories located on the I2C bus, for example
-Ethernet hardware addresses, RAM module parameters (SPD), processor reset
-configuration word etc.
-.Pp
-It is very easy to render the whole system unusable when such configuration
-data is deleted or altered, so use the
-.Dq -d w
-(write) command only if you know exactly what you are doing.
-.Pp
-Also avoid ungraceful interrupting of an ongoing transaction on the I2C bus,
-as it can lead to potentially dangerous effects. Consider the following
-scenario: when the host CPU is reset (for whatever reason) in the middle of a
-started I2C transaction, the I2C slave device could be left in write mode
-waiting for data or offset to arrive. When the CPU reinitializes itself and
-talks to this I2C slave device again, the commands and other control info it
-sends are treated by the slave device as data or offset it was waiting for,
-and there's great potential for corruption if such a write is performed.
-.Sh EXAMPLES
-.Bl -bullet
-.It
-Scan the default bus (/dev/iic0) for devices:
-.Pp
-i2c -s
-.It
-Scan the default bus (/dev/iic0) for devices and skip addresses 0x56 and 
-0x45.
-.Pp
-i2c -s -n 0x56:0x45
-.It
-Scan the default bus (/dev/iic0) for devices and skip address range 
-0x34 to 0x56.
-.Pp
-i2c -s -n 0x34..0x56
-.It
-Read 8 bytes of data from device at address 0x56 (e.g., an EEPROM):
-.Pp
-i2c -a 0x56 -d r -c 8
-.It
-Write 16 bytes of data from file data.bin to device 0x56 at offset 0x10:
-.Pp
-i2c -a 0x56 -d w -c 16 -o 0x10 -b < data.bin
-.It
-Copy 4 bytes between two EEPROMs (0x56 on /dev/iic1 to 0x57 on /dev/iic0):
-.Pp
-i2c -a 0x56 -f /dev/iic1 -d r -c 0x4 -b | i2c -a 0x57 -f /dev/iic0 -d w -c 4 -b
-.It
-Reset the controller:
-.Pp
-i2c -f /dev/iic1 -r
-.El
-.Sh SEE ALSO
-.Xr iic 4 ,
-.Xr iicbus 4
-.Sh HISTORY
-The
-.Nm
-utility appeared in
-.Fx 8.0 .
-.Sh AUTHORS
-.An -nosplit
-The
-.Nm
-utility and this manual page were written by
-.An Bartlomiej Sieka
-.Aq tur@semihalf.com
-and 
-.An Michal Hajduk
-.Aq mih@semihalf.com .