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The current SMBus Host Notify implementation relies on .alert() to relay its notifications. However, the use cases where SMBus Host Notify is needed currently is to signal data ready on touchpads. This is closer to an IRQ than a custom API through .alert(). Given that the 2 touchpad manufacturers (Synaptics and Elan) that use SMBus Host Notify don't put any data in the SMBus payload, the concept actually matches one to one. Benefits are multiple: - simpler code and API: the client will just have an IRQ, and nothing needs to be added in the adapter beside internally enabling it. - no more specific workqueue, the threading is handled by IRQ core directly (when required) - no more races when removing the device (the drivers are already required to disable irq on remove) - simpler handling for drivers: use plain regular IRQs - no more dependency on i2c-smbus for i2c-i801 (and any other adapter) - the IRQ domain is created automatically when the adapter exports the Host Notify capability - the IRQ are assign only if ACPI, OF and the caller did not assign one already - the domain is automatically destroyed on remove - fewer lines of code (minus 20, yeah!) Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
151 lines
4.4 KiB
Plaintext
151 lines
4.4 KiB
Plaintext
#
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# I2C subsystem configuration
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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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select RT_MUTEXES
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select IRQ_DOMAIN
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---help---
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I2C (pronounce: I-squared-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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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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default y
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help
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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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if I2C
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config I2C_BOARDINFO
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bool
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default y
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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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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>.
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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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config I2C_MUX
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tristate "I2C bus multiplexing support"
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depends on HAS_IOMEM
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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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source drivers/i2c/muxes/Kconfig
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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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config I2C_SMBUS
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tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
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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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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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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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source drivers/i2c/algos/Kconfig
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source drivers/i2c/busses/Kconfig
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config I2C_STUB
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tristate "I2C/SMBus Test Stub"
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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>.
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If you don't know what to do here, definitely say N.
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config I2C_SLAVE
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bool "I2C slave support"
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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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endif
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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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depends on HAS_IOMEM
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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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endif # I2C
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endmenu
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