2019-05-19 12:07:45 +00:00
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# SPDX-License-Identifier: GPL-2.0-only
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2005-04-16 22:20:36 +00:00
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#
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2006-08-13 21:39:11 +00:00
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# I2C subsystem configuration
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2005-04-16 22:20:36 +00:00
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#
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2014-05-20 12:59:24 +00:00
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menu "I2C support"
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config I2C
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2005-04-16 22:20:36 +00:00
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tristate "I2C support"
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2009-12-06 16:06:22 +00:00
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select RT_MUTEXES
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2016-10-13 12:10:40 +00:00
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select IRQ_DOMAIN
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2020-06-13 16:50:22 +00:00
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help
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2011-07-08 22:33:24 +00:00
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I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
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2005-04-16 22:20:36 +00:00
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many micro controller applications and developed by Philips. SMBus,
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or System Management Bus is a subset of the I2C protocol. More
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information is contained in the directory <file:Documentation/i2c/>,
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especially in the file called "summary" there.
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Both I2C and SMBus are supported here. You will need this for
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hardware sensors support, and also for Video For Linux support.
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If you want I2C support, you should say Y here and also to the
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specific driver for your bus adapter(s) below.
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This I2C support can also be built as a module. If so, the module
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will be called i2c-core.
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2014-08-15 05:38:59 +00:00
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config ACPI_I2C_OPREGION
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bool "ACPI I2C Operation region support"
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depends on I2C=y && ACPI
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2014-05-20 12:59:24 +00:00
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default y
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help
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2014-08-15 05:38:59 +00:00
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Say Y here if you want to enable ACPI I2C operation region support.
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Operation Regions allow firmware (BIOS) code to access I2C slave devices,
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such as smart batteries through an I2C host controller driver.
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2014-05-20 12:59:24 +00:00
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2007-05-01 21:26:34 +00:00
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if I2C
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i2c: Add i2c_board_info and i2c_new_device()
This provides partial support for new-style I2C driver binding. It builds
on "struct i2c_board_info" declarations that identify I2C devices on a given
board. This is needed on systems with I2C devices that can't be fully probed
and/or autoconfigured, such as many embedded Linux configurations where the
way a given I2C device is wired may affect how it must be used.
There are two models for declaring such devices:
* LATE -- using a public function i2c_new_device(). This lets modules
declare I2C devices found *AFTER* a given I2C adapter becomes available.
For example, a PCI card could create adapters giving access to utility
chips on that card, and this would be used to associate those chips with
those adapters.
* EARLY -- from arch_initcall() level code, using a non-exported function
i2c_register_board_info(). This copies the declarations *BEFORE* such
an i2c_adapter becomes available, arranging that i2c_new_device() will
be called later when i2c-core registers the relevant i2c_adapter.
For example, arch/.../.../board-*.c files would declare the I2C devices
along with their platform data, and I2C devices would behave much like
PNPACPI devices. (That is, both enumerate from board-specific tables.)
To match the exported i2c_new_device(), the previously-private function
i2c_unregister_device() is now exported.
Pending later patches using these new APIs, this is effectively a NOP.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-05-01 21:26:31 +00:00
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config I2C_BOARDINFO
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2014-12-20 20:41:11 +00:00
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bool
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i2c: Add i2c_board_info and i2c_new_device()
This provides partial support for new-style I2C driver binding. It builds
on "struct i2c_board_info" declarations that identify I2C devices on a given
board. This is needed on systems with I2C devices that can't be fully probed
and/or autoconfigured, such as many embedded Linux configurations where the
way a given I2C device is wired may affect how it must be used.
There are two models for declaring such devices:
* LATE -- using a public function i2c_new_device(). This lets modules
declare I2C devices found *AFTER* a given I2C adapter becomes available.
For example, a PCI card could create adapters giving access to utility
chips on that card, and this would be used to associate those chips with
those adapters.
* EARLY -- from arch_initcall() level code, using a non-exported function
i2c_register_board_info(). This copies the declarations *BEFORE* such
an i2c_adapter becomes available, arranging that i2c_new_device() will
be called later when i2c-core registers the relevant i2c_adapter.
For example, arch/.../.../board-*.c files would declare the I2C devices
along with their platform data, and I2C devices would behave much like
PNPACPI devices. (That is, both enumerate from board-specific tables.)
To match the exported i2c_new_device(), the previously-private function
i2c_unregister_device() is now exported.
Pending later patches using these new APIs, this is effectively a NOP.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-05-01 21:26:31 +00:00
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default y
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2009-09-18 20:45:46 +00:00
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config I2C_COMPAT
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bool "Enable compatibility bits for old user-space"
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default y
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help
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Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
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other user-space package which expects i2c adapters to be class
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devices. If you don't know, say Y.
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2005-04-16 22:20:36 +00:00
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config I2C_CHARDEV
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tristate "I2C device interface"
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help
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Say Y here to use i2c-* device files, usually found in the /dev
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directory on your system. They make it possible to have user-space
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programs use the I2C bus. Information on how to do this is
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contained in the file <file:Documentation/i2c/dev-interface.rst>.
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This support is also available as a module. If so, the module
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will be called i2c-dev.
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2010-08-11 16:21:02 +00:00
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config I2C_MUX
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tristate "I2C bus multiplexing support"
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help
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Say Y here if you want the I2C core to support the ability to
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handle multiplexed I2C bus topologies, by presenting each
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multiplexed segment as a I2C adapter.
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This support is also available as a module. If so, the module
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will be called i2c-mux.
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2018-12-11 11:01:04 +00:00
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source "drivers/i2c/muxes/Kconfig"
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2010-08-11 16:21:03 +00:00
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2008-08-10 20:56:15 +00:00
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config I2C_HELPER_AUTO
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bool "Autoselect pertinent helper modules"
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default y
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help
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Some I2C bus drivers require so-called "I2C algorithm" modules
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to work. These are basically software-only abstractions of generic
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I2C interfaces. This option will autoselect them so that you don't
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have to care.
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Unselect this only if you need to enable additional helper
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modules, for example for use with external I2C bus drivers.
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In doubt, say Y.
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2010-03-02 11:23:43 +00:00
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config I2C_SMBUS
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2010-11-06 21:30:25 +00:00
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tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
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2010-03-02 11:23:43 +00:00
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help
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Say Y here if you want support for SMBus extensions to the I2C
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2016-07-18 10:39:43 +00:00
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specification. At the moment, two extensions are supported:
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the SMBus Alert protocol and the SMBus Host Notify protocol.
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2010-03-02 11:23:43 +00:00
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This support is also available as a module. If so, the module
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will be called i2c-smbus.
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2018-12-11 11:01:04 +00:00
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source "drivers/i2c/algos/Kconfig"
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source "drivers/i2c/busses/Kconfig"
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2012-10-05 20:23:52 +00:00
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config I2C_STUB
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tristate "I2C/SMBus Test Stub"
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2013-01-17 02:53:37 +00:00
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depends on m
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default 'n'
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help
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This module may be useful to developers of SMBus client drivers,
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especially for certain kinds of sensor chips.
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If you do build this module, be sure to read the notes and warnings
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in <file:Documentation/i2c/i2c-stub.rst>.
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2012-10-05 20:23:52 +00:00
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If you don't know what to do here, definitely say N.
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2014-11-18 16:04:54 +00:00
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config I2C_SLAVE
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bool "I2C slave support"
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2020-06-28 18:55:22 +00:00
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help
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This enables Linux to act as an I2C slave device. Note that your I2C
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bus master driver also needs to support this functionality. Please
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read Documentation/i2c/slave-interface.rst for further details.
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if I2C_SLAVE
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config I2C_SLAVE_EEPROM
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tristate "I2C eeprom slave driver"
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2020-06-28 18:54:26 +00:00
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help
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This backend makes Linux behave like an I2C EEPROM. Please read
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Documentation/i2c/slave-eeprom-backend.rst for further details.
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endif
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2005-04-16 22:20:36 +00:00
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config I2C_DEBUG_CORE
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bool "I2C Core debugging messages"
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help
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Say Y here if you want the I2C core to produce a bunch of debug
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messages to the system log. Select this if you are having a
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problem with I2C support and want to see more of what is going on.
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config I2C_DEBUG_ALGO
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bool "I2C Algorithm debugging messages"
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help
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Say Y here if you want the I2C algorithm drivers to produce a bunch
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of debug messages to the system log. Select this if you are having
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a problem with I2C support and want to see more of what is going
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on.
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config I2C_DEBUG_BUS
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bool "I2C Bus debugging messages"
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2012-10-05 20:23:52 +00:00
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depends on HAS_IOMEM
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2005-04-16 22:20:36 +00:00
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help
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Say Y here if you want the I2C bus drivers to produce a bunch of
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debug messages to the system log. Select this if you are having
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a problem with I2C support and want to see more of what is going
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on.
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2007-05-01 21:26:34 +00:00
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endif # I2C
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2014-05-20 12:59:24 +00:00
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endmenu
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