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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"
Martin Schwidefskye25df122007-05-10 15:45:57 +02007 depends on HAS_IOMEM
Mika Kuoppala194684e2009-12-06 17:06:22 +01008 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 ---help---
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.
15
16 Both I2C and SMBus are supported here. You will need this for
17 hardware sensors support, and also for Video For Linux support.
18
19 If you want I2C support, you should say Y here and also to the
20 specific driver for your bus adapter(s) below.
21
22 This I2C support can also be built as a module. If so, the module
23 will be called i2c-core.
24
Jan Engelhardt16538e62007-05-01 23:26:34 +020025if I2C
26
David Brownell9c1600e2007-05-01 23:26:31 +020027config I2C_BOARDINFO
28 boolean
David Brownell9c1600e2007-05-01 23:26:31 +020029 default y
30
Jean Delvare2bb50952009-09-18 22:45:46 +020031config I2C_COMPAT
32 boolean "Enable compatibility bits for old user-space"
33 default y
34 help
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.
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039config I2C_CHARDEV
40 tristate "I2C device interface"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 help
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>.
46
47 This support is also available as a module. If so, the module
48 will be called i2c-dev.
49
Michael Lawnick08263742010-08-11 18:21:02 +020050config I2C_MUX
51 tristate "I2C bus multiplexing support"
52 depends on EXPERIMENTAL
53 help
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.
57
58 This support is also available as a module. If so, the module
59 will be called i2c-mux.
60
Michael Lawnick7f528132010-08-11 18:21:03 +020061source drivers/i2c/muxes/Kconfig
62
Jean Delvare8d24f8d2008-08-10 22:56:15 +020063config I2C_HELPER_AUTO
64 bool "Autoselect pertinent helper modules"
65 default y
66 help
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
70 have to care.
71
72 Unselect this only if you need to enable additional helper
73 modules, for example for use with external I2C bus drivers.
74
75 In doubt, say Y.
76
Jean Delvaree2ca3072010-03-02 12:23:43 +010077config I2C_SMBUS
Jean Delvare0a572742010-10-24 18:16:57 +020078 tristate
79 prompt "SMBus-specific protocols" if !I2C_HELPER_AUTO
Jean Delvaree2ca3072010-03-02 12:23:43 +010080 help
81 Say Y here if you want support for SMBus extensions to the I2C
82 specification. At the moment, the only supported extension is
83 the SMBus alert protocol.
84
85 This support is also available as a module. If so, the module
86 will be called i2c-smbus.
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088source drivers/i2c/algos/Kconfig
89source drivers/i2c/busses/Kconfig
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91config I2C_DEBUG_CORE
92 bool "I2C Core debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 help
94 Say Y here if you want the I2C core to produce a bunch of debug
95 messages to the system log. Select this if you are having a
96 problem with I2C support and want to see more of what is going on.
97
98config I2C_DEBUG_ALGO
99 bool "I2C Algorithm debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 help
101 Say Y here if you want the I2C algorithm drivers to produce a bunch
102 of debug messages to the system log. Select this if you are having
103 a problem with I2C support and want to see more of what is going
104 on.
105
106config I2C_DEBUG_BUS
107 bool "I2C Bus debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 help
109 Say Y here if you want the I2C bus drivers to produce a bunch of
110 debug messages to the system log. Select this if you are having
111 a problem with I2C support and want to see more of what is going
112 on.
113
Jan Engelhardt16538e62007-05-01 23:26:34 +0200114endif # I2C