linux/drivers/i2c/Kconfig
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   1#
   2# I2C subsystem configuration
   3#
   4
   5menuconfig I2C
   6        tristate "I2C support"
   7        select RT_MUTEXES
   8        ---help---
   9          I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
  10          many micro controller applications and developed by Philips.  SMBus,
  11          or System Management Bus is a subset of the I2C protocol.  More
  12          information is contained in the directory <file:Documentation/i2c/>,
  13          especially in the file called "summary" there.
  14
  15          Both I2C and SMBus are supported here. You will need this for
  16          hardware sensors support, and also for Video For Linux support.
  17
  18          If you want I2C support, you should say Y here and also to the
  19          specific driver for your bus adapter(s) below.
  20
  21          This I2C support can also be built as a module.  If so, the module
  22          will be called i2c-core.
  23
  24if I2C
  25
  26config I2C_BOARDINFO
  27        boolean
  28        default y
  29
  30config I2C_COMPAT
  31        boolean "Enable compatibility bits for old user-space"
  32        default y
  33        help
  34          Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  35          other user-space package which expects i2c adapters to be class
  36          devices. If you don't know, say Y.
  37
  38config I2C_CHARDEV
  39        tristate "I2C device interface"
  40        help
  41          Say Y here to use i2c-* device files, usually found in the /dev
  42          directory on your system.  They make it possible to have user-space
  43          programs use the I2C bus.  Information on how to do this is
  44          contained in the file <file:Documentation/i2c/dev-interface>.
  45
  46          This support is also available as a module.  If so, the module 
  47          will be called i2c-dev.
  48
  49config I2C_MUX
  50        tristate "I2C bus multiplexing support"
  51        depends on HAS_IOMEM
  52        help
  53          Say Y here if you want the I2C core to support the ability to
  54          handle multiplexed I2C bus topologies, by presenting each
  55          multiplexed segment as a I2C adapter.
  56
  57          This support is also available as a module.  If so, the module
  58          will be called i2c-mux.
  59
  60source drivers/i2c/muxes/Kconfig
  61
  62config I2C_HELPER_AUTO
  63        bool "Autoselect pertinent helper modules"
  64        default y
  65        help
  66          Some I2C bus drivers require so-called "I2C algorithm" modules
  67          to work. These are basically software-only abstractions of generic
  68          I2C interfaces. This option will autoselect them so that you don't
  69          have to care.
  70
  71          Unselect this only if you need to enable additional helper
  72          modules, for example for use with external I2C bus drivers.
  73
  74          In doubt, say Y.
  75
  76config I2C_SMBUS
  77        tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  78        depends on GENERIC_HARDIRQS
  79        help
  80          Say Y here if you want support for SMBus extensions to the I2C
  81          specification. At the moment, the only supported extension is
  82          the SMBus alert protocol.
  83
  84          This support is also available as a module.  If so, the module
  85          will be called i2c-smbus.
  86
  87source drivers/i2c/algos/Kconfig
  88source drivers/i2c/busses/Kconfig
  89
  90config I2C_STUB
  91        tristate "I2C/SMBus Test Stub"
  92        depends on m
  93        default 'n'
  94        help
  95          This module may be useful to developers of SMBus client drivers,
  96          especially for certain kinds of sensor chips.
  97
  98          If you do build this module, be sure to read the notes and warnings
  99          in <file:Documentation/i2c/i2c-stub>.
 100
 101          If you don't know what to do here, definitely say N.
 102
 103config I2C_DEBUG_CORE
 104        bool "I2C Core debugging messages"
 105        help
 106          Say Y here if you want the I2C core to produce a bunch of debug
 107          messages to the system log.  Select this if you are having a
 108          problem with I2C support and want to see more of what is going on.
 109
 110config I2C_DEBUG_ALGO
 111        bool "I2C Algorithm debugging messages"
 112        help
 113          Say Y here if you want the I2C algorithm drivers to produce a bunch
 114          of debug messages to the system log.  Select this if you are having
 115          a problem with I2C support and want to see more of what is going
 116          on.
 117
 118config I2C_DEBUG_BUS
 119        bool "I2C Bus debugging messages"
 120        depends on HAS_IOMEM
 121        help
 122          Say Y here if you want the I2C bus drivers to produce a bunch of
 123          debug messages to the system log.  Select this if you are having
 124          a problem with I2C support and want to see more of what is going
 125          on.
 126
 127endif # I2C
 128
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