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CONFIG_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.
CONFIG_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.
CONFIG_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.
CONFIG_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.
CONFIG_I2C_VELLEMAN
This supports the Velleman K9000 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.
CONFIG_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.
CONFIG_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.
CONFIG_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.
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.
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