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IIC(4)		       FreeBSD Kernel Interfaces Manual			IIC(4)

NAME
     iic -- Inter IC (I2C) bus

SYNOPSIS
     iic* at kiic?		    # macppc
     iic* at piic?		    # macppc
     iic* at smu?		    # macppc
     iic* at alipm?		    # alpha i386 sparc64
     iic* at amdiic?		    # amd64 i386
     iic* at amdpm?		    # i386
     iic* at glxpcib?		    # i386
     iic* at gscsio?		    # i386
     iic* at ichiic?		    # amd64 i386
     iic* at nviic?		    # amd64 i386
     iic* at pcamux?		    # arm64
     iic* at pcfiic?		    # sparc64
     iic* at piixpm?		    # amd64 i386
     iic* at viapm?		    # amd64 i386
     iic* at gpioiic?		    # i386
     iic* at gdiumiic?		    # loongson
     iic* at tsciic?		    # alpha
     iic* at amliic?		    # arm64
     iic* at bcmbsc?		    # arm64 armv7
     iic* at dwiic?		    # amd64 arm64
     iic* at octiic?		    # octeon
     iic* at imxiic?		    # arm64 armv7
     iic* at mviic?		    # arm64
     iic* at rkiic?		    # arm64 armv7
     iic* at sxitwi?		    # arm64 armv7

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 at-
     tached 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.  Devices
     are found on the bus using	a sophisticated	scanning routine which at-
     tempts to identify	commonly available devices.  On	other machines (such
     as	sparc64	and macppc) where the machine ROM supplies a list of I2C de-
     vices, that list is used instead.

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

SUPPORTED MASTERS
     alipm(4)	    Acer Labs M7101 SMBus controller
     amdiic(4)	    AMD-8111 SMBus controller
     amdpm(4)	    AMD-756/766/768/8111 Power Management and SMBus controller
     amliic(4)	    Amlogic I2C	controller
     bcmbsc(4)	    Broadcom Serial Control controller
     dwiic(4)	    Synopsys DesignWare	I2C controller
     glxpcib(4)	    AMD	CS5536 PCI-ISA bridge with timecounter,	watchdog
		    timer, and GPIO
     gpioiic(4)	    GPIO I2C controller
     gscsio(4)	    National Semiconductor Geode SC1100	I2C controller
     ichiic(4)	    Intel ICH SMBus controller
     imxiic(4)	    Freescale i.MX I2C controller
     kiic(4)	    Apple Kauai	I2C controller
     mviic(4)	    Marvell Armada 3700	I2C Controller
     nviic(4)	    NVIDIA nForce2/3/4 SMBus controller
     octiic(4)	    OCTEON two-wire serial interface
     pcfiic(4)	    Philips PCF8584 I2C	controller
     piic(4)	    Apple via-pmu I2C controller
     piixpm(4)	    Intel PIIX SMBus controller
     rkiic(4)	    Rockchip I2C controller
     smu(4)	    Apple System Management Unit
     sxitwi(4)	    Allwinner Two Wire Interface controller
     tsciic(4)	    DECchip 21272 and 21274 Core Logic chipset I2C controller
     viapm(4)	    VIA	SMBus controller

SUPPORTED SLAVES
     abcrtc(4)	    Abracon AB1805 real-time clock
     adc(4)	    Analog Devices AD7416/AD7417/7418 temperature sensor
     adl(4)	    Andigilog aSC7621 temperature, voltage, and	fan sensor
     admcts(4)	    Analog Devices ADM1026 temperature and voltage sensor
     admlc(4)	    Analog Devices ADM1024 temperature and voltage sensor
     admtemp(4)	    Analog Devices ADM1021 temperature sensor
     admtm(4)	    Analog Devices ADM1025 temperature and voltage sensor
     admtmp(4)	    Analog Devices ADM1030 temperature sensor
     admtt(4)	    Analog Devices ADM1031 temperature sensor
     adt(4)	    Analog Devices ADT7460 temperature,	voltage, and fan sen-
		    sor
     adtfsm(4)	    Analog Devices ADT7462 temperature,	voltage, and fan sen-
		    sor
     andl(4)	    Andigilog aSC7611 temperature, voltage, and	fan sensor
     asbtm(4)	    Asus ASB 100 temperature sensor
     asms(4)	    Apple sudden motion	sensor
     axppmic(4)	    X-Powers AXP Power Management IC
     bdpmic(4)	    ROHM BD718x7 Power Management IC
     bgw(4)	    Bosch motion sensor
     ccpmic(4)	    Intel Crystal Cove Power Management	IC
     cwfg(4)	    CellWise CW201x fuel gauge
     dsxrtc(4)	    Maxim DS3231/DS3232	real-time clock
     ecadc(4)	    environmental monitoring subsystem temperature sensor
     escodec(4)	    Everest Semiconductor ES8316 audio codec
     fanpwr(4)	    Fairchild FAN53555 voltage regulator
     fcu(4)	    Apple Fan Control Unit sensor device
     fintek(4)	    Fintek F75375 temperature sensor
     fusbtc(4)	    Fairchild FUSB302 USB Type-C Port controller
     glenv(4)	    Genesys Logic GL518SM temperature, voltage,	and fan	sensor
     iatp(4)	    Atmel maXTouch touchpad and	touchscreen
     ihidev(4)	    HID	over I2C support
     islrtc(4)	    Intersil ISL1208/1218 real-time clock
     lisa(4)	    STMicroelectronics LIS331DL	MEMS motion sensor
     lm(4)	    National Semiconductor LM78/79/81 temperature, voltage,
		    and	fan sensor
     lmenv(4)	    National Semiconductor LM87	temperature, voltage, and fan
		    sensor
     lmn(4)	    National Semiconductor LM93	temperature, voltage, and fan
		    sensor
     lmtemp(4)	    National Semiconductor LM75/LM76/LM77 temperature sensor
     maxds(4)	    Maxim DS1624/DS1631/DS1721 temperature sensor
     maxrtc(4)	    Maxim DS1307 real-time clock
     maxtmp(4)	    Maxim MAX6642/MAX6690 temperature sensor
     mcprtc(4)	    Microchip MCP79400 real-time clock
     mfokrtc(4)	    M41T8x real-time clock
     nvt(4)	    Nuvoton W83795G/ADG	temperature, voltage, and fan sensor
     pcagpio(4)	    Philips PCA955[4567] GPIO controller
     pcaled(4)	    Philips PCA9532/9552 GPIO LED dimmer
     pcamux(4)	    Philips PCA954[678]	I2C switch/mux
     pcfadc(4)	    Philips PCF8591 temperature	sensor
     pcfrtc(4)	    NXP	PCF8523	real-time clock
     pcxrtc(4)	    NXP	PCF8563	real-time clock
     ricohrtc(4)    Ricoh RS5C372 real-time clock
     rkpmic(4)	    Rockchip RK8xx Power Management IC
     sdtemp(4)	    SO-DIMM (JC-42.4) temperature sensor
     spdmem(4)	    Serial Presence Detect memory
     ssdfb(4)	    Solomon Systech SSD1306/SSD1309 OLED display module
     stsec(4)	    ST7	embedded controller
     tcpci(4)	    USB	Type-C Port Controller Interface
     tda(4)	    Philips TDA8444 fan	controller
     thmc(4)	    TI THMC50, Analog ADM1022/1028 temperature sensor
     tsl(4)	    TAOS TSL2560/61 light sensor
     wbenv(4)	    Winbond W83L784R/W83L785R/W83L785TS-L temperature, volt-
		    age, and fan sensor
     wbng(4)	    Winbond W83793G temperature, voltage, and fan sensor

SEE ALSO
     intro(4), iic(9)

HISTORY
     The I2C framework first appeared in NetBSD	2.0.  OpenBSD support was
     added in OpenBSD 3.6.  I2C	bus scanning was added in OpenBSD 3.9.

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>.

FreeBSD	13.0		       November	13, 2020		  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | SUPPORTED MASTERS | SUPPORTED SLAVES | SEE ALSO | HISTORY | AUTHORS

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