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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
Arthur Othienobe53f9b2006-08-13 23:39:11 +02002# I2C subsystem configuration
Linus Torvalds1da177e2005-04-16 15:20:36 -07003#
4
Jan Engelhardt16538e62007-05-01 23:26:34 +02005menuconfig I2C
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 tristate "I2C support"
Mika Kuoppala194684e2009-12-06 17:06:22 +01007 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 ---help---
Michael Witten622e0402011-07-08 22:33:24 +00009 I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 many micro controller applications and developed by Philips. SMBus,
11 or System Management Bus is a subset of the I2C protocol. More
12 information is contained in the directory <file:Documentation/i2c/>,
13 especially in the file called "summary" there.
14
15 Both I2C and SMBus are supported here. You will need this for
16 hardware sensors support, and also for Video For Linux support.
17
18 If you want I2C support, you should say Y here and also to the
19 specific driver for your bus adapter(s) below.
20
21 This I2C support can also be built as a module. If so, the module
22 will be called i2c-core.
23
Jan Engelhardt16538e62007-05-01 23:26:34 +020024if I2C
25
David Brownell9c1600e2007-05-01 23:26:31 +020026config I2C_BOARDINFO
27 boolean
David Brownell9c1600e2007-05-01 23:26:31 +020028 default y
29
Jean Delvare2bb50952009-09-18 22:45:46 +020030config I2C_COMPAT
31 boolean "Enable compatibility bits for old user-space"
32 default y
33 help
34 Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
35 other user-space package which expects i2c adapters to be class
36 devices. If you don't know, say Y.
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038config I2C_CHARDEV
39 tristate "I2C device interface"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 help
41 Say Y here to use i2c-* device files, usually found in the /dev
42 directory on your system. They make it possible to have user-space
43 programs use the I2C bus. Information on how to do this is
44 contained in the file <file:Documentation/i2c/dev-interface>.
45
46 This support is also available as a module. If so, the module
47 will be called i2c-dev.
48
Michael Lawnick08263742010-08-11 18:21:02 +020049config I2C_MUX
50 tristate "I2C bus multiplexing support"
Peter Huewe3ddb59d2012-10-05 22:23:52 +020051 depends on HAS_IOMEM
Michael Lawnick08263742010-08-11 18:21:02 +020052 help
53 Say Y here if you want the I2C core to support the ability to
54 handle multiplexed I2C bus topologies, by presenting each
55 multiplexed segment as a I2C adapter.
56
57 This support is also available as a module. If so, the module
58 will be called i2c-mux.
59
Michael Lawnick7f528132010-08-11 18:21:03 +020060source drivers/i2c/muxes/Kconfig
61
Jean Delvare8d24f8d2008-08-10 22:56:15 +020062config I2C_HELPER_AUTO
63 bool "Autoselect pertinent helper modules"
64 default y
65 help
66 Some I2C bus drivers require so-called "I2C algorithm" modules
67 to work. These are basically software-only abstractions of generic
68 I2C interfaces. This option will autoselect them so that you don't
69 have to care.
70
71 Unselect this only if you need to enable additional helper
72 modules, for example for use with external I2C bus drivers.
73
74 In doubt, say Y.
75
Jean Delvaree2ca3072010-03-02 12:23:43 +010076config I2C_SMBUS
Arnaud Lacombedfc518d2010-11-06 18:30:25 -030077 tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
Jean Delvaree2ca3072010-03-02 12:23:43 +010078 help
79 Say Y here if you want support for SMBus extensions to the I2C
80 specification. At the moment, the only supported extension is
81 the SMBus alert protocol.
82
83 This support is also available as a module. If so, the module
84 will be called i2c-smbus.
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086source drivers/i2c/algos/Kconfig
87source drivers/i2c/busses/Kconfig
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Peter Huewe3ddb59d2012-10-05 22:23:52 +020089config I2C_STUB
90 tristate "I2C/SMBus Test Stub"
Kees Cook417e86c2013-01-16 18:53:37 -080091 depends on m
Peter Huewe3ddb59d2012-10-05 22:23:52 +020092 default 'n'
93 help
94 This module may be useful to developers of SMBus client drivers,
95 especially for certain kinds of sensor chips.
96
97 If you do build this module, be sure to read the notes and warnings
98 in <file:Documentation/i2c/i2c-stub>.
99
100 If you don't know what to do here, definitely say N.
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102config I2C_DEBUG_CORE
103 bool "I2C Core debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 help
105 Say Y here if you want the I2C core to produce a bunch of debug
106 messages to the system log. Select this if you are having a
107 problem with I2C support and want to see more of what is going on.
108
109config I2C_DEBUG_ALGO
110 bool "I2C Algorithm debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 help
112 Say Y here if you want the I2C algorithm drivers to produce a bunch
113 of debug messages to the system log. Select this if you are having
114 a problem with I2C support and want to see more of what is going
115 on.
116
117config I2C_DEBUG_BUS
118 bool "I2C Bus debugging messages"
Peter Huewe3ddb59d2012-10-05 22:23:52 +0200119 depends on HAS_IOMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 help
121 Say Y here if you want the I2C bus drivers to produce a bunch of
122 debug messages to the system log. Select this if you are having
123 a problem with I2C support and want to see more of what is going
124 on.
125
Jan Engelhardt16538e62007-05-01 23:26:34 +0200126endif # I2C