| # |
| # I2C subsystem configuration |
| # |
| |
| menuconfig I2C |
| tristate "I2C support" |
| select RT_MUTEXES |
| ---help--- |
| I2C (pronounce: I-squared-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. |
| |
| If you want I2C support, you should say Y here and also to the |
| specific driver for your bus adapter(s) below. |
| |
| This I2C support can also be built as a module. If so, the module |
| will be called i2c-core. |
| |
| if I2C |
| |
| config I2C_BOARDINFO |
| boolean |
| default y |
| |
| config I2C_COMPAT |
| boolean "Enable compatibility bits for old user-space" |
| default y |
| help |
| Say Y here if you intend to run lm-sensors 3.1.1 or older, or any |
| other user-space package which expects i2c adapters to be class |
| devices. If you don't know, say Y. |
| |
| config I2C_CHARDEV |
| tristate "I2C device interface" |
| help |
| 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 support is also available as a module. If so, the module |
| will be called i2c-dev. |
| |
| config I2C_MUX |
| tristate "I2C bus multiplexing support" |
| depends on HAS_IOMEM |
| help |
| Say Y here if you want the I2C core to support the ability to |
| handle multiplexed I2C bus topologies, by presenting each |
| multiplexed segment as a I2C adapter. |
| |
| This support is also available as a module. If so, the module |
| will be called i2c-mux. |
| |
| source drivers/i2c/muxes/Kconfig |
| |
| config I2C_SLAVE |
| bool "I2C slave driver support" |
| default n |
| help |
| Say Y here if you want the I2C slave functionality in the driver. |
| The external system will be master and the system on which this |
| driver is running act as i2c slave. |
| This drivers supports read/write data from master devices through |
| I2C. |
| |
| config I2C_HELPER_AUTO |
| bool "Autoselect pertinent helper modules" |
| default y |
| help |
| Some I2C bus drivers require so-called "I2C algorithm" modules |
| to work. These are basically software-only abstractions of generic |
| I2C interfaces. This option will autoselect them so that you don't |
| have to care. |
| |
| Unselect this only if you need to enable additional helper |
| modules, for example for use with external I2C bus drivers. |
| |
| In doubt, say Y. |
| |
| config I2C_SMBUS |
| tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO |
| depends on GENERIC_HARDIRQS |
| help |
| Say Y here if you want support for SMBus extensions to the I2C |
| specification. At the moment, the only supported extension is |
| the SMBus alert protocol. |
| |
| This support is also available as a module. If so, the module |
| will be called i2c-smbus. |
| |
| source drivers/i2c/algos/Kconfig |
| source drivers/i2c/busses/Kconfig |
| |
| config I2C_STUB |
| tristate "I2C/SMBus Test Stub" |
| depends on m |
| default 'n' |
| help |
| This module may be useful to developers of SMBus client drivers, |
| especially for certain kinds of sensor chips. |
| |
| If you do build this module, be sure to read the notes and warnings |
| in <file:Documentation/i2c/i2c-stub>. |
| |
| If you don't know what to do here, definitely say N. |
| |
| config I2C_DEBUG_CORE |
| bool "I2C Core debugging messages" |
| help |
| Say Y here if you want the I2C core to produce a bunch of debug |
| messages to the system log. Select this if you are having a |
| problem with I2C support and want to see more of what is going on. |
| |
| config I2C_DEBUG_ALGO |
| bool "I2C Algorithm debugging messages" |
| help |
| Say Y here if you want the I2C algorithm drivers to produce a bunch |
| of debug messages to the system log. Select this if you are having |
| a problem with I2C support and want to see more of what is going |
| on. |
| |
| config I2C_DEBUG_BUS |
| bool "I2C Bus debugging messages" |
| depends on HAS_IOMEM |
| help |
| Say Y here if you want the I2C bus drivers to produce a bunch of |
| debug messages to the system log. Select this if you are having |
| a problem with I2C support and want to see more of what is going |
| on. |
| |
| endif # I2C |