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 ACPI_I2C_OPREGION
  27         bool "ACPI I2C Operation region support"
  28         depends on I2C=y && ACPI
  29         default y
  30         help
  31           Say Y here if you want to enable ACPI I2C operation region support.
  32           Operation Regions allow firmware (BIOS) code to access I2C slave devices,
  33           such as smart batteries through an I2C host controller driver.
  34
  35 if I2C
  36
  37 config I2C_BOARDINFO
  38         boolean
  39         default y
  40
  41 config I2C_COMPAT
  42         boolean "Enable compatibility bits for old user-space"
  43         default y
  44         help
  45           Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  46           other user-space package which expects i2c adapters to be class
  47           devices. If you don't know, say Y.
  48
  49 config I2C_CHARDEV
  50         tristate "I2C device interface"
  51         help
  52           Say Y here to use i2c-* device files, usually found in the /dev
  53           directory on your system.  They make it possible to have user-space
  54           programs use the I2C bus.  Information on how to do this is
  55           contained in the file <file:Documentation/i2c/dev-interface>.
  56
  57           This support is also available as a module.  If so, the module
  58           will be called i2c-dev.
  59
  60 config I2C_MUX
  61         tristate "I2C bus multiplexing support"
  62         depends on HAS_IOMEM
  63         help
  64           Say Y here if you want the I2C core to support the ability to
  65           handle multiplexed I2C bus topologies, by presenting each
  66           multiplexed segment as a I2C adapter.
  67
  68           This support is also available as a module.  If so, the module
  69           will be called i2c-mux.
  70
  71 source drivers/i2c/muxes/Kconfig
  72
  73 config I2C_HELPER_AUTO
  74         bool "Autoselect pertinent helper modules"
  75         default y
  76         help
  77           Some I2C bus drivers require so-called "I2C algorithm" modules
  78           to work. These are basically software-only abstractions of generic
  79           I2C interfaces. This option will autoselect them so that you don't
  80           have to care.
  81
  82           Unselect this only if you need to enable additional helper
  83           modules, for example for use with external I2C bus drivers.
  84
  85           In doubt, say Y.
  86
  87 config I2C_SMBUS
  88         tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  89         help
  90           Say Y here if you want support for SMBus extensions to the I2C
  91           specification. At the moment, the only supported extension is
  92           the SMBus alert protocol.
  93
  94           This support is also available as a module.  If so, the module
  95           will be called i2c-smbus.
  96
  97 source drivers/i2c/algos/Kconfig
  98 source drivers/i2c/busses/Kconfig
  99
 100 config I2C_STUB
 101         tristate "I2C/SMBus Test Stub"
 102         depends on m
 103         default 'n'
 104         help
 105           This module may be useful to developers of SMBus client drivers,
 106           especially for certain kinds of sensor chips.
 107
 108           If you do build this module, be sure to read the notes and warnings
 109           in <file:Documentation/i2c/i2c-stub>.
 110
 111           If you don't know what to do here, definitely say N.
 112
 113 config I2C_DEBUG_CORE
 114         bool "I2C Core debugging messages"
 115         help
 116           Say Y here if you want the I2C core to produce a bunch of debug
 117           messages to the system log.  Select this if you are having a
 118           problem with I2C support and want to see more of what is going on.
 119
 120 config I2C_DEBUG_ALGO
 121         bool "I2C Algorithm debugging messages"
 122         help
 123           Say Y here if you want the I2C algorithm drivers to produce a bunch
 124           of debug messages to the system log.  Select this if you are having
 125           a problem with I2C support and want to see more of what is going
 126           on.
 127
 128 config I2C_DEBUG_BUS
 129         bool "I2C Bus debugging messages"
 130         depends on HAS_IOMEM
 131         help
 132           Say Y here if you want the I2C bus drivers to produce a bunch of
 133           debug messages to the system log.  Select this if you are having
 134           a problem with I2C support and want to see more of what is going
 135           on.
 136
 137 endif # I2C
 138
 139 endmenu