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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
Jean Delvare8d24f8d2008-08-10 22:56:15 +020050config I2C_HELPER_AUTO
51 bool "Autoselect pertinent helper modules"
52 default y
53 help
54 Some I2C bus drivers require so-called "I2C algorithm" modules
55 to work. These are basically software-only abstractions of generic
56 I2C interfaces. This option will autoselect them so that you don't
57 have to care.
58
59 Unselect this only if you need to enable additional helper
60 modules, for example for use with external I2C bus drivers.
61
62 In doubt, say Y.
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064source drivers/i2c/algos/Kconfig
65source drivers/i2c/busses/Kconfig
66source drivers/i2c/chips/Kconfig
67
68config I2C_DEBUG_CORE
69 bool "I2C Core debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 help
71 Say Y here if you want the I2C core to produce a bunch of debug
72 messages to the system log. Select this if you are having a
73 problem with I2C support and want to see more of what is going on.
74
75config I2C_DEBUG_ALGO
76 bool "I2C Algorithm debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 help
78 Say Y here if you want the I2C algorithm drivers to produce a bunch
79 of debug messages to the system log. Select this if you are having
80 a problem with I2C support and want to see more of what is going
81 on.
82
83config I2C_DEBUG_BUS
84 bool "I2C Bus debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 help
86 Say Y here if you want the I2C bus drivers to produce a bunch of
87 debug messages to the system log. Select this if you are having
88 a problem with I2C support and want to see more of what is going
89 on.
90
91config I2C_DEBUG_CHIP
92 bool "I2C Chip debugging messages"
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 help
94 Say Y here if you want the I2C chip drivers to produce a bunch of
95 debug messages to the system log. Select this if you are having
96 a problem with I2C support and want to see more of what is going
97 on.
98
Jan Engelhardt16538e62007-05-01 23:26:34 +020099endif # I2C