1#
2# I2C subsystem configuration
3#
4
5menuconfig I2C
6	tristate "I2C support"
7	depends on HAS_IOMEM
8	select RT_MUTEXES
9	---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
25if I2C
26
27config I2C_BOARDINFO
28	boolean
29	default y
30
31config 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
39config I2C_CHARDEV
40	tristate "I2C device interface"
41	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
50config 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
61source drivers/i2c/muxes/Kconfig
62
63config 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
77config I2C_SMBUS
78	tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
79	help
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.
83
84	  This support is also available as a module.  If so, the module
85	  will be called i2c-smbus.
86
87source drivers/i2c/algos/Kconfig
88source drivers/i2c/busses/Kconfig
89
90config I2C_DEBUG_CORE
91	bool "I2C Core debugging messages"
92	help
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.
96
97config I2C_DEBUG_ALGO
98	bool "I2C Algorithm debugging messages"
99	help
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
103	  on.
104
105config I2C_DEBUG_BUS
106	bool "I2C Bus debugging messages"
107	help
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
111	  on.
112
113endif # I2C
114