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IIC(4)			 BSD Kernel Interfaces Manual			IIC(4)

NAME
     iic — Inter IC (I2C) bus

SYNOPSIS
     iic* at alipm?		  # sparc64
     iic* at acpismbus?		  # amd64 i386
     iic* at amdpm?		  # amd64 i386
     iic* at armadillo9iic?	  # evbarm
     iic0 at at91twi?		  # evbarm
     iic0 at ausmbus0		  # evbmips
     iic0 at cuda0		  # macppc
     iic0 at gpiic?		  # evbppc
     iic* at gpioiic?		  # amd64 i386
     iic* at gtiic?		  # evbppc
     iic* at gxiic?		  # evbarm
     iic* at ichsmb?		  # amd64 i386
     iic0 at iociic0		  # acorn26
     iic0 at iomdiic?		  # acorn32
     iic0 at iopiic?		  # evbarm iyonix
     iic* at ki2c?		  # macppc
     iic* at nfsmb?		  # amd64 i386
     iic* at ociic?		  # sandpoint
     iic* at piixpm?		  # amd64 i386
     iic0 at slugiic0		  # evbarm
     iic* at viapcib?		  # i386

DESCRIPTION
     I2C is a two-wire bus developed by Philips used for connecting integrated
     circuits.	It is commonly used for connecting devices such as EEPROMs,
     temperature sensors, fan controllers, real-time clocks, tuners, and other
     types of integrated circuits.

     The iic driver provides a uniform programming interface layer between I2C
     master controllers and various I2C slave devices.	Each I2C master con‐
     troller attaches an iic framework; several slave devices can then be
     attached to the iic bus.

     All I2C slave devices are uniquely identified by the address on the bus.
     The master accesses a particular slave device using its address.

     System Management Bus (SMBus) protocol is also supported by emulating it
     with the I2C commands.

SUPPORTED MASTERS
     A wide list of I2C masters are supported, among them are:

	   alipm(4)	       Acer Labs M7101 SMBus controller
	   acpismbus(4)	       ACPI SMBus Control Method Interface
	   amdpm(4)	       AMD768 Power Management Controller and AMD8111
			       System Management Controller
	   armadillo9iic(4)
	   at91twi(4)
	   ausmbus(4)
	   cuda(4)	       support for CUDA microcontrollers found in many
			       Power Macintosh and and compatible computers
	   gpiic(4)
	   gtiic(4)
	   gxiic(4)
	   ichsmb(4)	       Intel ICH SMBus controller
	   iociic(4)
	   iomdiic(4)
	   iopiic(4)
	   ki2c(4)
	   gpioiic(4)	       GPIO bit-banging
	   nfsmb(4)	       NVIDIA nForce 2/3/4 SMBus controller and SMBus
			       driver
	   ociic(4)
	   piixpm(4)	       Intel PIIX and compatible Power Management con‐
			       troller
	   slugiic(4)
	   viapcib(4)

SUPPORTED SLAVES
     A wide list of slaves are supported, among them:

	   dbcool(4)	  dbCool(tm) family of environmental monitors and fan
			  controllers
	   rs5c372rtc(4)  RICOH RS5C372A and RS5C372B real-time clock
	   sgsmix(4)	  driver for SGS 7433 Basic Audio Processor found in
			  some Apple machines
	   spdmem(4)	  Generic Memory Module Serial Presence Detect

SEE ALSO
     dtviic(4), intro(4), i2cscan(8), iic(9)

HISTORY
     The I2C framework first appeared in NetBSD 2.0.  OpenBSD support was
     added in OpenBSD 3.6.  This manpage first appeared in NetBSD 6.0, it was
     ported from OpenBSD.

AUTHORS
     The I2C framework was written by Steve C. Woodford and Jason R. Thorpe
     for NetBSD and then ported to OpenBSD by Alexander Yurchenko
     ⟨grange@openbsd.org⟩.

BSD			       October 15, 2011				   BSD

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