linux/drivers/i2c/Kconfig
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   1#
   2# I2C subsystem configuration
   3#
   4
   5menuconfig I2C
   6        tristate "I2C support"
   7        depends on !S390
   8        select RT_MUTEXES
   9        ---help---
  10          I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
  11          many micro controller applications and developed by Philips.  SMBus,
  12          or System Management Bus is a subset of the I2C protocol.  More
  13          information is contained in the directory <file:Documentation/i2c/>,
  14          especially in the file called "summary" there.
  15
  16          Both I2C and SMBus are supported here. You will need this for
  17          hardware sensors support, and also for Video For Linux support.
  18
  19          If you want I2C support, you should say Y here and also to the
  20          specific driver for your bus adapter(s) below.
  21
  22          This I2C support can also be built as a module.  If so, the module
  23          will be called i2c-core.
  24
  25if I2C
  26
  27config I2C_BOARDINFO
  28        boolean
  29        default y
  30
  31config I2C_COMPAT
  32        boolean "Enable compatibility bits for old user-space"
  33        default y
  34        help
  35          Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  36          other user-space package which expects i2c adapters to be class
  37          devices. If you don't know, say Y.
  38
  39config I2C_CHARDEV
  40        tristate "I2C device interface"
  41        help
  42          Say Y here to use i2c-* device files, usually found in the /dev
  43          directory on your system.  They make it possible to have user-space
  44          programs use the I2C bus.  Information on how to do this is
  45          contained in the file <file:Documentation/i2c/dev-interface>.
  46
  47          This support is also available as a module.  If so, the module 
  48          will be called i2c-dev.
  49
  50config I2C_MUX
  51        tristate "I2C bus multiplexing support"
  52        depends on HAS_IOMEM
  53        help
  54          Say Y here if you want the I2C core to support the ability to
  55          handle multiplexed I2C bus topologies, by presenting each
  56          multiplexed segment as a I2C adapter.
  57
  58          This support is also available as a module.  If so, the module
  59          will be called i2c-mux.
  60
  61source drivers/i2c/muxes/Kconfig
  62
  63config I2C_HELPER_AUTO
  64        bool "Autoselect pertinent helper modules"
  65        default y
  66        help
  67          Some I2C bus drivers require so-called "I2C algorithm" modules
  68          to work. These are basically software-only abstractions of generic
  69          I2C interfaces. This option will autoselect them so that you don't
  70          have to care.
  71
  72          Unselect this only if you need to enable additional helper
  73          modules, for example for use with external I2C bus drivers.
  74
  75          In doubt, say Y.
  76
  77config I2C_SMBUS
  78        tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  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 EXPERIMENTAL && 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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