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 EEP-
     ROMs, 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
     controller 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 controller
	   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