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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
       or name 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

       This manual page was strongly inspired from those written  by  David  Z
       Maze for i2cset.

				   May 2008			     I2CGET(8)

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