drivers/i2c/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # I2C subsystem configuration
   4 #
   5
   6 menu "I2C support"
   7
   8 config 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
  28 config 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
  37 if I2C
  38
  39 config I2C_BOARDINFO
  40         bool
  41         default y
  42
  43 config 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
  51 config 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.rst>.
  58
  59           This support is also available as a module.  If so, the module
  60           will be called i2c-dev.
  61
  62 config 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
  72 source "drivers/i2c/muxes/Kconfig"
  73
  74 config 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
  88 config 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
  98 source "drivers/i2c/algos/Kconfig"
  99 source "drivers/i2c/busses/Kconfig"
 100
 101 config I2C_STUB
 102         tristate "I2C/SMBus Test Stub"
 103         depends on m
 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.rst>.
 110
 111           If you don't know what to do here, definitely say N.
 112
 113 config I2C_SLAVE
 114         bool "I2C slave support"
 115         help
 116           This enables Linux to act as an I2C slave device. Note that your I2C
 117           bus master driver also needs to support this functionality. Please
 118           read Documentation/i2c/slave-interface.rst for further details.
 119
 120 if I2C_SLAVE
 121
 122 config I2C_SLAVE_EEPROM
 123         tristate "I2C eeprom slave driver"
 124         help
 125           This backend makes Linux behave like an I2C EEPROM. Please read
 126           Documentation/i2c/slave-eeprom-backend.rst for further details.
 127
 128 config I2C_SLAVE_TESTUNIT
 129         tristate "I2C eeprom testunit driver"
 130         help
 131           This backend can be used to trigger test cases for I2C bus masters
 132           which require a remote device with certain capabilities, e.g.
 133           multi-master, SMBus Host Notify, etc. Please read
 134           Documentation/i2c/slave-testunit-backend.rst for further details.
 135
 136 endif
 137
 138 config I2C_DEBUG_CORE
 139         bool "I2C Core debugging messages"
 140         help
 141           Say Y here if you want the I2C core to produce a bunch of debug
 142           messages to the system log.  Select this if you are having a
 143           problem with I2C support and want to see more of what is going on.
 144
 145 config I2C_DEBUG_ALGO
 146         bool "I2C Algorithm debugging messages"
 147         help
 148           Say Y here if you want the I2C algorithm drivers to produce a bunch
 149           of debug messages to the system log.  Select this if you are having
 150           a problem with I2C support and want to see more of what is going
 151           on.
 152
 153 config I2C_DEBUG_BUS
 154         bool "I2C Bus debugging messages"
 155         depends on HAS_IOMEM
 156         help
 157           Say Y here if you want the I2C bus drivers to produce a bunch of
 158           debug messages to the system log.  Select this if you are having
 159           a problem with I2C support and want to see more of what is going
 160           on.
 161
 162 endif # I2C
 163
 164 endmenu