# SPDX-License-Identifier: GPL-2.0-only

  #

  # I2C subsystem configuration

  #

  menu "I2C support"
  
  config I2C

  	tristate "I2C support"

  	select RT_MUTEXES

  	select IRQ_DOMAIN

  	help

  	  I2C (pronounce: I-squared-C) is a slow serial bus protocol used in

  	  many micro controller applications and developed by Philips.  SMBus,
  	  or System Management Bus is a subset of the I2C protocol.  More
  	  information is contained in the directory <file:Documentation/i2c/>,
  	  especially in the file called "summary" there.
  
  	  Both I2C and SMBus are supported here. You will need this for
  	  hardware sensors support, and also for Video For Linux support.
  
  	  If you want I2C support, you should say Y here and also to the
  	  specific driver for your bus adapter(s) below.
  
  	  This I2C support can also be built as a module.  If so, the module
  	  will be called i2c-core.

  config ACPI_I2C_OPREGION
  	bool "ACPI I2C Operation region support"
  	depends on I2C=y && ACPI

  	default y
  	help

  	  Say Y here if you want to enable ACPI I2C operation region support.
  	  Operation Regions allow firmware (BIOS) code to access I2C slave devices,
  	  such as smart batteries through an I2C host controller driver.

  if I2C

  config I2C_BOARDINFO

  	bool

  	default y

  config I2C_COMPAT

  	bool "Enable compatibility bits for old user-space"

  	default y
  	help
  	  Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
  	  other user-space package which expects i2c adapters to be class
  	  devices. If you don't know, say Y.

  config I2C_CHARDEV
  	tristate "I2C device interface"

  	help
  	  Say Y here to use i2c-* device files, usually found in the /dev
  	  directory on your system.  They make it possible to have user-space
  	  programs use the I2C bus.  Information on how to do this is

  	  contained in the file <file:Documentation/i2c/dev-interface.rst>.

  
  	  This support is also available as a module.  If so, the module 
  	  will be called i2c-dev.

  config I2C_MUX
  	tristate "I2C bus multiplexing support"

  	help
  	  Say Y here if you want the I2C core to support the ability to
  	  handle multiplexed I2C bus topologies, by presenting each
  	  multiplexed segment as a I2C adapter.
  
  	  This support is also available as a module.  If so, the module
  	  will be called i2c-mux.

  source "drivers/i2c/muxes/Kconfig"

  config I2C_HELPER_AUTO
  	bool "Autoselect pertinent helper modules"
  	default y
  	help
  	  Some I2C bus drivers require so-called "I2C algorithm" modules
  	  to work. These are basically software-only abstractions of generic
  	  I2C interfaces. This option will autoselect them so that you don't
  	  have to care.
  
  	  Unselect this only if you need to enable additional helper
  	  modules, for example for use with external I2C bus drivers.
  
  	  In doubt, say Y.

  config I2C_SMBUS

  	tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO

  	help
  	  Say Y here if you want support for SMBus extensions to the I2C

  	  specification. At the moment, two extensions are supported:
  	  the SMBus Alert protocol and the SMBus Host Notify protocol.

  
  	  This support is also available as a module.  If so, the module
  	  will be called i2c-smbus.

  source "drivers/i2c/algos/Kconfig"
  source "drivers/i2c/busses/Kconfig"

  config I2C_STUB
  	tristate "I2C/SMBus Test Stub"

  	depends on m

  	help
  	  This module may be useful to developers of SMBus client drivers,
  	  especially for certain kinds of sensor chips.
  
  	  If you do build this module, be sure to read the notes and warnings

  	  in <file:Documentation/i2c/i2c-stub.rst>.

  
  	  If you don't know what to do here, definitely say N.

  config I2C_SLAVE
  	bool "I2C slave support"

  	help
  	  This enables Linux to act as an I2C slave device. Note that your I2C
  	  bus master driver also needs to support this functionality. Please
  	  read Documentation/i2c/slave-interface.rst for further details.

  
  if I2C_SLAVE
  
  config I2C_SLAVE_EEPROM
  	tristate "I2C eeprom slave driver"

  	help
  	  This backend makes Linux behave like an I2C EEPROM. Please read
  	  Documentation/i2c/slave-eeprom-backend.rst for further details.

  config I2C_SLAVE_TESTUNIT
  	tristate "I2C eeprom testunit driver"
  	help
  	  This backend can be used to trigger test cases for I2C bus masters
  	  which require a remote device with certain capabilities, e.g.
  	  multi-master, SMBus Host Notify, etc. Please read
  	  Documentation/i2c/slave-testunit-backend.rst for further details.

  endif

  config I2C_DEBUG_CORE
  	bool "I2C Core debugging messages"

  	help
  	  Say Y here if you want the I2C core to produce a bunch of debug
  	  messages to the system log.  Select this if you are having a
  	  problem with I2C support and want to see more of what is going on.
  
  config I2C_DEBUG_ALGO
  	bool "I2C Algorithm debugging messages"

  	help
  	  Say Y here if you want the I2C algorithm drivers to produce a bunch
  	  of debug messages to the system log.  Select this if you are having
  	  a problem with I2C support and want to see more of what is going
  	  on.
  
  config I2C_DEBUG_BUS
  	bool "I2C Bus debugging messages"

  	depends on HAS_IOMEM

  	help
  	  Say Y here if you want the I2C bus drivers to produce a bunch of
  	  debug messages to the system log.  Select this if you are having
  	  a problem with I2C support and want to see more of what is going
  	  on.

  endif # I2C

  
  endmenu