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I2CGET(8)							     I2CGET(8)

NAME
       i2cget - read from I2C/SMBus chip registers

SYNOPSIS
       i2cget [-f] [-y] i2cbus chip-address [data-address [mode]]
       i2cget -V


DESCRIPTION
       i2cget  is a small helper program to read registers visible through the
       I2C bus (or SMBus).

OPTIONS
       -V     Display the version and exit.

       -f     Force access to the device  even	if  it	is  already  busy.  By
	      default,	i2cget will refuse to access a device which is already
	      under the control of a kernel driver. Using this flag is danger‐
	      ous,  it can seriously confuse the kernel driver in question. It
	      can also cause i2cget to return an invalid value. So use at your
	      own risk and only if you know what you're doing.

       -y     Disable  interactive  mode.  By  default, i2cget will wait for a
	      confirmation from the user before messing with the I2C bus. When
	      this  flag is used, it will perform the operation directly. This
	      is mainly meant to be used in scripts. Use with caution.

       There are two required options to i2cget. i2cbus indicates  the	number
       of  the I2C bus to be scanned.  This number should correspond to one of
       the busses listed by i2cdetect -l. chip-address specifies  the  address
       of the chip on that bus, and is an integer between 0x03 and 0x77.

       data-address specifies the address on that chip to read from, and is an
       integer between 0x00 and 0xFF. If omitted, the currently active	regis‐
       ter will be read (if that makes sense for the considered chip).

       The mode parameter, if specified, is one of the letters b, w or c, cor‐
       responding to a read byte data, a read word data or a  write  byte/read
       byte  transaction,  respectively.  A p can also be appended to the mode
       parameter to enable PEC. If  the	 mode  parameter  is  omitted,	i2cget
       defaults	 to  a read byte data transaction, unless data-address is also
       omitted, in which case the default (and only valid)  transaction	 is  a
       single read byte.

WARNING
       i2cget can be extremely dangerous if used improperly. I2C and SMBus are
       designed in such a way that an SMBus read transaction can be seen as  a
       write  transaction  by certain chips. This is particularly true if set‐
       ting mode to cp (write byte/read byte with PEC). Be  extremely  careful
       using this program.

SEE ALSO
       i2cdump(8), i2cset(8)

AUTHOR
       Jean  Delvare  http://www.lm-sensors.org/ This manual page was strongly
       inspired from those written by David Z Maze for i2cset.

				   June 2007			     I2CGET(8)

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