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1 #
2 # I2C subsystem configuration
3 #
4
5 menuconfig I2C
6 tristate "I2C support"
7 depends on HAS_IOMEM
8 ---help---
9 I2C (pronounce: I-square-C) is a slow serial bus protocol used in
10 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
24 if I2C
25
26 config I2C_BOARDINFO
27 boolean
28 default y
29
30 config I2C_CHARDEV
31 tristate "I2C device interface"
32 help
33 Say Y here to use i2c-* device files, usually found in the /dev
34 directory on your system. They make it possible to have user-space
35 programs use the I2C bus. Information on how to do this is
36 contained in the file <file:Documentation/i2c/dev-interface>.
37
38 This support is also available as a module. If so, the module
39 will be called i2c-dev.
40
41 config I2C_HELPER_AUTO
42 bool "Autoselect pertinent helper modules"
43 default y
44 help
45 Some I2C bus drivers require so-called "I2C algorithm" modules
46 to work. These are basically software-only abstractions of generic
47 I2C interfaces. This option will autoselect them so that you don't
48 have to care.
49
50 Unselect this only if you need to enable additional helper
51 modules, for example for use with external I2C bus drivers.
52
53 In doubt, say Y.
54
55 source drivers/i2c/algos/Kconfig
56 source drivers/i2c/busses/Kconfig
57 source drivers/i2c/chips/Kconfig
58
59 config I2C_DEBUG_CORE
60 bool "I2C Core debugging messages"
61 help
62 Say Y here if you want the I2C core to produce a bunch of debug
63 messages to the system log. Select this if you are having a
64 problem with I2C support and want to see more of what is going on.
65
66 config I2C_DEBUG_ALGO
67 bool "I2C Algorithm debugging messages"
68 help
69 Say Y here if you want the I2C algorithm drivers to produce a bunch
70 of debug messages to the system log. Select this if you are having
71 a problem with I2C support and want to see more of what is going
72 on.
73
74 config I2C_DEBUG_BUS
75 bool "I2C Bus debugging messages"
76 help
77 Say Y here if you want the I2C bus drivers to produce a bunch of
78 debug messages to the system log. Select this if you are having
79 a problem with I2C support and want to see more of what is going
80 on.
81
82 config I2C_DEBUG_CHIP
83 bool "I2C Chip debugging messages"
84 help
85 Say Y here if you want the I2C chip drivers to produce a bunch of
86 debug messages to the system log. Select this if you are having
87 a problem with I2C support and want to see more of what is going
88 on.
89
90 endif # I2C