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         bool
  39         default y
  40
  41 config I2C_COMPAT
  42         bool "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         help
  63           Say Y here if you want the I2C core to support the ability to
  64           handle multiplexed I2C bus topologies, by presenting each
  65           multiplexed segment as a I2C adapter.
  66
  67           This support is also available as a module.  If so, the module
  68           will be called i2c-mux.
  69
  70 source drivers/i2c/muxes/Kconfig
  71
  72 config I2C_HELPER_AUTO
  73         bool "Autoselect pertinent helper modules"
  74         default y
  75         help
  76           Some I2C bus drivers require so-called "I2C algorithm" modules
  77           to work. These are basically software-only abstractions of generic
  78           I2C interfaces. This option will autoselect them so that you don't
  79           have to care.
  80
  81           Unselect this only if you need to enable additional helper
  82           modules, for example for use with external I2C bus drivers.
  83
  84           In doubt, say Y.
  85
  86 config I2C_SMBUS
  87         tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  88         help
  89           Say Y here if you want support for SMBus extensions to the I2C
  90           specification. At the moment, two extensions are supported:
  91           the SMBus Alert protocol and the SMBus Host Notify protocol.
  92
  93           This support is also available as a module.  If so, the module
  94           will be called i2c-smbus.
  95
  96 source drivers/i2c/algos/Kconfig
  97 source drivers/i2c/busses/Kconfig
  98
  99 config I2C_STUB
 100         tristate "I2C/SMBus Test Stub"
 101         depends on m
 102         default 'n'
 103         help
 104           This module may be useful to developers of SMBus client drivers,
 105           especially for certain kinds of sensor chips.
 106
 107           If you do build this module, be sure to read the notes and warnings
 108           in <file:Documentation/i2c/i2c-stub>.
 109
 110           If you don't know what to do here, definitely say N.
 111
 112 config I2C_SLAVE
 113         bool "I2C slave support"
 114
 115 if I2C_SLAVE
 116
 117 config I2C_SLAVE_EEPROM
 118         tristate "I2C eeprom slave driver"
 119
 120 endif
 121
 122 config I2C_DEBUG_CORE
 123         bool "I2C Core debugging messages"
 124         help
 125           Say Y here if you want the I2C core to produce a bunch of debug
 126           messages to the system log.  Select this if you are having a
 127           problem with I2C support and want to see more of what is going on.
 128
 129 config I2C_DEBUG_ALGO
 130         bool "I2C Algorithm debugging messages"
 131         help
 132           Say Y here if you want the I2C algorithm drivers to produce a bunch
 133           of 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 config I2C_DEBUG_BUS
 138         bool "I2C Bus debugging messages"
 139         depends on HAS_IOMEM
 140         help
 141           Say Y here if you want the I2C bus drivers to produce a bunch of
 142           debug messages to the system log.  Select this if you are having
 143           a problem with I2C support and want to see more of what is going
 144           on.
 145
 146 endif # I2C
 147
 148 endmenu