LXR linux/drivers/i2c/Kconfig

   1# SPDX-License-Identifier: GPL-2.0-only
   2#
   3# I2C subsystem configuration
   4#
   5
   6menu "I2C support"
   7
   8config I2C
   9        tristate "I2C support"
  10        select RT_MUTEXES
  11        select IRQ_DOMAIN
  12        ---help---
  13          I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
  14          many micro controller applications and developed by Philips.  SMBus,
  15          or System Management Bus is a subset of the I2C protocol.  More
  16          information is contained in the directory <file:Documentation/i2c/>,
  17          especially in the file called "summary" there.
  18
  19          Both I2C and SMBus are supported here. You will need this for
  20          hardware sensors support, and also for Video For Linux support.
  21
  22          If you want I2C support, you should say Y here and also to the
  23          specific driver for your bus adapter(s) below.
  24
  25          This I2C support can also be built as a module.  If so, the module
  26          will be called i2c-core.
  27
  28config ACPI_I2C_OPREGION
  29        bool "ACPI I2C Operation region support"
  30        depends on I2C=y && ACPI
  31        default y
  32        help
  33          Say Y here if you want to enable ACPI I2C operation region support.
  34          Operation Regions allow firmware (BIOS) code to access I2C slave devices,
  35          such as smart batteries through an I2C host controller driver.
  36
  37if I2C
  38
  39config I2C_BOARDINFO
  40        bool
  41        default y
  42
  43config I2C_COMPAT
  44        bool "Enable compatibility bits for old user-space"
  45        default y
  46        help
  47          Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  48          other user-space package which expects i2c adapters to be class
  49          devices. If you don't know, say Y.
  50
  51config I2C_CHARDEV
  52        tristate "I2C device interface"
  53        help
  54          Say Y here to use i2c-* device files, usually found in the /dev
  55          directory on your system.  They make it possible to have user-space
  56          programs use the I2C bus.  Information on how to do this is
  57          contained in the file <file:Documentation/i2c/dev-interface>.
  58
  59          This support is also available as a module.  If so, the module 
  60          will be called i2c-dev.
  61
  62config I2C_MUX
  63        tristate "I2C bus multiplexing support"
  64        help
  65          Say Y here if you want the I2C core to support the ability to
  66          handle multiplexed I2C bus topologies, by presenting each
  67          multiplexed segment as a I2C adapter.
  68
  69          This support is also available as a module.  If so, the module
  70          will be called i2c-mux.
  71
  72source "drivers/i2c/muxes/Kconfig"
  73
  74config I2C_HELPER_AUTO
  75        bool "Autoselect pertinent helper modules"
  76        default y
  77        help
  78          Some I2C bus drivers require so-called "I2C algorithm" modules
  79          to work. These are basically software-only abstractions of generic
  80          I2C interfaces. This option will autoselect them so that you don't
  81          have to care.
  82
  83          Unselect this only if you need to enable additional helper
  84          modules, for example for use with external I2C bus drivers.
  85
  86          In doubt, say Y.
  87
  88config I2C_SMBUS
  89        tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
  90        help
  91          Say Y here if you want support for SMBus extensions to the I2C
  92          specification. At the moment, two extensions are supported:
  93          the SMBus Alert protocol and the SMBus Host Notify protocol.
  94
  95          This support is also available as a module.  If so, the module
  96          will be called i2c-smbus.
  97
  98source "drivers/i2c/algos/Kconfig"
  99source "drivers/i2c/busses/Kconfig"
 100
 101config I2C_STUB
 102        tristate "I2C/SMBus Test Stub"
 103        depends on m
 104        default 'n'
 105        help
 106          This module may be useful to developers of SMBus client drivers,
 107          especially for certain kinds of sensor chips.
 108
 109          If you do build this module, be sure to read the notes and warnings
 110          in <file:Documentation/i2c/i2c-stub>.
 111
 112          If you don't know what to do here, definitely say N.
 113
 114config I2C_SLAVE
 115        bool "I2C slave support"
 116
 117if I2C_SLAVE
 118
 119config I2C_SLAVE_EEPROM
 120        tristate "I2C eeprom slave driver"
 121
 122endif
 123
 124config I2C_DEBUG_CORE
 125        bool "I2C Core debugging messages"
 126        help
 127          Say Y here if you want the I2C core to produce a bunch of debug
 128          messages to the system log.  Select this if you are having a
 129          problem with I2C support and want to see more of what is going on.
 130
 131config I2C_DEBUG_ALGO
 132        bool "I2C Algorithm debugging messages"
 133        help
 134          Say Y here if you want the I2C algorithm drivers to produce a bunch
 135          of debug messages to the system log.  Select this if you are having
 136          a problem with I2C support and want to see more of what is going
 137          on.
 138
 139config I2C_DEBUG_BUS
 140        bool "I2C Bus debugging messages"
 141        depends on HAS_IOMEM
 142        help
 143          Say Y here if you want the I2C bus drivers to produce a bunch of
 144          debug messages to the system log.  Select this if you are having
 145          a problem with I2C support and want to see more of what is going
 146          on.
 147
 148endif # I2C
 149
 150endmenu
 151