I2C supportCONFIG_I2C  I2C (pronounce: I-square-C) is a slow serial bus protocol used in  many micro controller applications and developed by Philips.  SMBus,  or System Management Bus is a subset of the I2C protocol.  More  information is contained in the directory <file:Documentation/i2c/>,  especially in the file called "summary" there.  Both I2C and SMBus are supported here. You will need this for  hardware sensors support, and also for Video For Linux support.  Specifically, if you want to use a BT848 based frame grabber/overlay  boards under Linux, say Y here and also to "I2C bit-banging  interfaces", below.  If you want I2C support, you should say Y here and also to the  specific driver for your bus adapter(s) below.  If you say Y to  "/proc file system" below, you will then get a /proc interface which  is documented in <file:Documentation/i2c/proc-interface>.  This I2C support is also available as a module.  If you want to  compile it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-core.o.UltraSPARC-III bootbus i2c controller driverCONFIG_BBC_I2C  The BBC devices on the UltraSPARC III have two I2C controllers.  The  first I2C controller connects mainly to configuration PROMs (NVRAM,  CPU configuration, DIMM types, etc.).  The second I2C controller  connects to environmental control devices such as fans and  temperature sensors.  The second controller also connects to the  smartcard reader, if present.  Say Y to enable support for these.I2C bit-banging interfacesCONFIG_I2C_ALGOBIT  This allows you to use a range of I2C adapters called bit-banging  adapters.  Say Y if you own an I2C adapter belonging to this class  and then say Y to the specific driver for you adapter below.  This support is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-algo-bit.o.Philips style parallel port adapterCONFIG_I2C_PHILIPSPAR  This supports parallel-port I2C adapters made by Philips.  Say Y if  you own such an adapter.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-philips-par.o.  Note that if you want support for different parallel port devices,  life will be much easier if you compile them all as modules.ELV adapterCONFIG_I2C_ELV  This supports parallel-port I2C adapters called ELV.  Say Y if you  own such an adapter.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-elv.o.Velleman K8000 adapterCONFIG_I2C_VELLEMAN  This supports the Velleman K8000 parallel-port I2C adapter.  Say Y  if you own such an adapter.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-velleman.o.Basic I2C on Parallel Port adapterCONFIG_I2C_PPORT  This supports directly connecting I2C devices to the parallel port.  See <file:Documentation/i2c/i2c-pport> for more information.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-pport.o.I2C PCF 8584 interfacesCONFIG_I2C_ALGOPCF  This allows you to use a range of I2C adapters called PCF adapters.  Say Y if you own an I2C adapter belonging to this class and then say  Y to the specific driver for you adapter below.  This support is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-algo-pcf.o.Elektor ISA cardCONFIG_I2C_ELEKTOR  This supports the PCF8584 ISA bus I2C adapter.  Say Y if you own  such an adapter.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-elektor.o.PCF on the EPP Parallel PortCONFIG_I2C_PCFEPP  This supports the PCF8584 connected to the parallel port.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-pcf-epp.o.ITE I2C AlgorithmCONFIG_ITE_I2C_ALGO  This supports the use the ITE8172 I2C interface found on some MIPS  systems. Say Y if you have one of these. You should also say Y for  the ITE I2C peripheral driver support below.  This support is also available as a module. If you want to compile  it as a modules, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-algo-ite.o.ITE I2C AdapterCONFIG_ITE_I2C_ADAP  This supports the ITE8172 I2C peripheral found on some MIPS  systems. Say Y if you have one of these. You should also say Y for  the ITE I2C driver algorithm support above.  This support is also available as a module. If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-adap-ite.o.SiByte I2C AlgorithmCONFIG_I2C_ALGO_SIBYTE  Supports the SiByte SOC on-chip I2C interfaces (2 channels).MAX1617 Temperature SensorCONFIG_I2C_MAX1617  This builds a simple polling driver for the Maxim 1617 temperature  sensor.  Currently the device is only supported on a SiByte I2C  adapter, and the driver prints status updates to the system log.SGI I2C AlgorithmCONFIG_I2C_ALGO_SGI  Supports the SGI interfaces like the ones found on SGI Indy VINO  or SGI O2 MACE.Motorola 8xx I2C algorithmCONFIG_I2C_ALGO8XX  This is the algorithm that allows you to use Motorola 8xx I2C adapters.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-algo-8xx.o.Motorola 8xx I2C interfaceCONFIG_I2C_RPXLITE  This supports the Motorola 8xx I2C device.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-rpx.o.IBM 405 I2C algorithmCONFIG_I2C_IBM_OCP_ALGO  This is the algorithm that allows you to use IBM 405 I2C adapters.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-algo-ibm_ocp.o.IBM 405 I2C interfaceCONFIG_I2C_IBM_OCP_ADAP  This supports the IBM 405 I2C device.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-adap-ibm_ocp.o.StrongARM SA-1110 interfaceCONFIG_I2C_FRODO  This supports the StrongARM SA-1110 Development Board.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-frodo.o.I2C device interfaceCONFIG_I2C_CHARDEV  Say Y here to use i2c-* device files, usually found in the /dev  directory on your system.  They make it possible to have user-space  programs use the I2C bus.  Information on how to do this is  contained in the file <file:Documentation/i2c/dev-interface>.  This code is also available as a module.  If you want to compile  it as a module, say M here and read  <file:Documentation/modules.txt>.  The module will be called i2c-dev.o.I2C /proc interface (required for hardware sensors)CONFIG_I2C_PROC  This provides support for i2c device entries in the /proc filesystem.  The entries will be found in /proc/sys/dev/sensors.  This code is also available as a module. If you want to compile  it as a module, say M here and read <file:Documentation/modules.txt>.  The module will be called i2c-proc.o.Powermac Keywest I2C interfaceCONFIG_I2C_KEYWEST  This supports the use of the I2C interface in the combo-I/O  chip on recent Apple machines.  Say Y if you have such a machine.  This driver is also available as a module.  If you want to compile  it as a module, say M here and read Documentation/modules.txt.  The module will be called i2c-keywest.o.