2005-04-17 06:20:36 +08:00
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#
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2006-08-14 05:39:11 +08:00
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# I2C subsystem configuration
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2005-04-17 06:20:36 +08:00
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#
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menu "I2C support"
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config I2C
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tristate "I2C support"
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---help---
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I2C (pronounce: I-square-C) is a slow serial bus protocol used in
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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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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>
2007-05-02 05:26:31 +08:00
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config I2C_BOARDINFO
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boolean
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depends on I2C
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default y
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2005-04-17 06:20:36 +08:00
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config I2C_CHARDEV
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tristate "I2C device interface"
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depends on I2C
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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>.
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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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source drivers/i2c/algos/Kconfig
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source drivers/i2c/busses/Kconfig
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source drivers/i2c/chips/Kconfig
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config I2C_DEBUG_CORE
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bool "I2C Core debugging messages"
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depends on I2C
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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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depends on I2C
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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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depends on I2C
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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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config I2C_DEBUG_CHIP
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bool "I2C Chip debugging messages"
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depends on I2C
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help
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Say Y here if you want the I2C chip 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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endmenu
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