drivers/i2c/Kconfig

   1 #
   2 # I2C subsystem configuration
   3 #
   4
   5 menu "I2C support"
   6
   7 config I2C
   8         tristate "I2C support"
   9         select RT_MUTEXES
  10         ---help---
  11           I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
  12           many micro controller applications and developed by Philips.  SMBus,
  13           or System Management Bus is a subset of the I2C protocol.  More
  14           information is contained in the directory <file:Documentation/i2c/>,
  15           especially in the file called "summary" there.
  16
  17           Both I2C and SMBus are supported here. You will need this for
  18           hardware sensors support, and also for Video For Linux support.
  19
  20           If you want I2C support, you should say Y here and also to the
  21           specific driver for your bus adapter(s) below.
  22
  23           This I2C support can also be built as a module.  If so, the module
  24           will be called i2c-core.
  25
  26 config I2C_ACPI
  27         bool "I2C ACPI support"
  28         select I2C
  29         depends on ACPI
  30         default y
  31         help
  32           Say Y here if you want to enable ACPI I2C support. This includes support
  33           for automatic enumeration of I2C slave devices and support for ACPI I2C
  34           Operation Regions. Operation Regions allow firmware (BIOS) code to
  35           access I2C slave devices, such as smart batteries through an I2C host
  36           controller driver.
  37
  38 if I2C
  39
  40 config I2C_BOARDINFO
  41         boolean
  42         default y
  43
  44 config I2C_COMPAT
  45         boolean "Enable compatibility bits for old user-space"
  46         default y
  47         help
  48           Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  49           other user-space package which expects i2c adapters to be class
  50           devices. If you don't know, say Y.
  51
  52 config I2C_CHARDEV
  53         tristate "I2C device interface"
  54         help
  55           Say Y here to use i2c-* device files, usually found in the /dev
  56           directory on your system.  They make it possible to have user-space
  57           programs use the I2C bus.  Information on how to do this is
  58           contained in the file <file:Documentation/i2c/dev-interface>.
  59
  60           This support is also available as a module.  If so, the module
  61           will be called i2c-dev.
  62
  63 config I2C_MUX
  64         tristate "I2C bus multiplexing support"
  65         depends on HAS_IOMEM
  66         help
  67           Say Y here if you want the I2C core to support the ability to
  68           handle multiplexed I2C bus topologies, by presenting each
  69           multiplexed segment as a I2C adapter.
  70
  71           This support is also available as a module.  If so, the module
  72           will be called i2c-mux.
  73
  74 source drivers/i2c/muxes/Kconfig
  75
  76 config I2C_HELPER_AUTO
  77         bool "Autoselect pertinent helper modules"
  78         default y
  79         help
  80           Some I2C bus drivers require so-called "I2C algorithm" modules
  81           to work. These are basically software-only abstractions of generic
  82           I2C interfaces. This option will autoselect them so that you don't
  83           have to care.
  84
  85           Unselect this only if you need to enable additional helper
  86           modules, for example for use with external I2C bus drivers.
  87
  88           In doubt, say Y.
  89
  90 config I2C_SMBUS
  91         tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  92         help
  93           Say Y here if you want support for SMBus extensions to the I2C
  94           specification. At the moment, the only supported extension is
  95           the SMBus alert protocol.
  96
  97           This support is also available as a module.  If so, the module
  98           will be called i2c-smbus.
  99
 100 source drivers/i2c/algos/Kconfig
 101 source drivers/i2c/busses/Kconfig
 102
 103 config I2C_STUB
 104         tristate "I2C/SMBus Test Stub"
 105         depends on m
 106         default 'n'
 107         help
 108           This module may be useful to developers of SMBus client drivers,
 109           especially for certain kinds of sensor chips.
 110
 111           If you do build this module, be sure to read the notes and warnings
 112           in <file:Documentation/i2c/i2c-stub>.
 113
 114           If you don't know what to do here, definitely say N.
 115
 116 config I2C_DEBUG_CORE
 117         bool "I2C Core debugging messages"
 118         help
 119           Say Y here if you want the I2C core to produce a bunch of debug
 120           messages to the system log.  Select this if you are having a
 121           problem with I2C support and want to see more of what is going on.
 122
 123 config I2C_DEBUG_ALGO
 124         bool "I2C Algorithm debugging messages"
 125         help
 126           Say Y here if you want the I2C algorithm drivers to produce a bunch
 127           of debug messages to the system log.  Select this if you are having
 128           a problem with I2C support and want to see more of what is going
 129           on.
 130
 131 config I2C_DEBUG_BUS
 132         bool "I2C Bus debugging messages"
 133         depends on HAS_IOMEM
 134         help
 135           Say Y here if you want the I2C bus drivers to produce a bunch of
 136           debug messages to the system log.  Select this if you are having
 137           a problem with I2C support and want to see more of what is going
 138           on.
 139
 140 endif # I2C
 141
 142 endmenu