2 # I2C subsystem configuration
10 I2C (pronounce: I-square-C) is a slow serial bus protocol used in
11 many micro controller applications and developed by Philips. SMBus,
12 or System Management Bus is a subset of the I2C protocol. More
13 information is contained in the directory <file:Documentation/i2c/>,
14 especially in the file called "summary" there.
16 Both I2C and SMBus are supported here. You will need this for
17 hardware sensors support, and also for Video For Linux support.
19 If you want I2C support, you should say Y here and also to the
20 specific driver for your bus adapter(s) below.
22 This I2C support can also be built as a module. If so, the module
23 will be called i2c-core.
32 boolean "Enable compatibility bits for old user-space"
35 Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
36 other user-space package which expects i2c adapters to be class
37 devices. If you don't know, say Y.
40 tristate "I2C device interface"
42 Say Y here to use i2c-* device files, usually found in the /dev
43 directory on your system. They make it possible to have user-space
44 programs use the I2C bus. Information on how to do this is
45 contained in the file <file:Documentation/i2c/dev-interface>.
47 This support is also available as a module. If so, the module
48 will be called i2c-dev.
51 tristate "I2C bus multiplexing support"
52 depends on EXPERIMENTAL
54 Say Y here if you want the I2C core to support the ability to
55 handle multiplexed I2C bus topologies, by presenting each
56 multiplexed segment as a I2C adapter.
58 This support is also available as a module. If so, the module
59 will be called i2c-mux.
61 source drivers/i2c/muxes/Kconfig
63 config I2C_HELPER_AUTO
64 bool "Autoselect pertinent helper modules"
67 Some I2C bus drivers require so-called "I2C algorithm" modules
68 to work. These are basically software-only abstractions of generic
69 I2C interfaces. This option will autoselect them so that you don't
72 Unselect this only if you need to enable additional helper
73 modules, for example for use with external I2C bus drivers.
78 tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
80 Say Y here if you want support for SMBus extensions to the I2C
81 specification. At the moment, the only supported extension is
82 the SMBus alert protocol.
84 This support is also available as a module. If so, the module
85 will be called i2c-smbus.
87 source drivers/i2c/algos/Kconfig
88 source drivers/i2c/busses/Kconfig
91 bool "I2C Core debugging messages"
93 Say Y here if you want the I2C core to produce a bunch of debug
94 messages to the system log. Select this if you are having a
95 problem with I2C support and want to see more of what is going on.
98 bool "I2C Algorithm debugging messages"
100 Say Y here if you want the I2C algorithm drivers to produce a bunch
101 of debug messages to the system log. Select this if you are having
102 a problem with I2C support and want to see more of what is going
106 bool "I2C Bus debugging messages"
108 Say Y here if you want the I2C bus drivers to produce a bunch of
109 debug messages to the system log. Select this if you are having
110 a problem with I2C support and want to see more of what is going