1#
2# I2C subsystem configuration
3#
4
5menu "I2C support"
6
7config I2C
8	tristate "I2C support"
9	select RT_MUTEXES
10	---help---
11	  I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
12	  many micro controller applications and developed by Philips.  SMBus,
13	  or System Management Bus is a subset of the I2C protocol.  More
14	  information is contained in the directory <file:Documentation/i2c/>,
15	  especially in the file called "summary" there.
16
17	  Both I2C and SMBus are supported here. You will need this for
18	  hardware sensors support, and also for Video For Linux support.
19
20	  If you want I2C support, you should say Y here and also to the
21	  specific driver for your bus adapter(s) below.
22
23	  This I2C support can also be built as a module.  If so, the module
24	  will be called i2c-core.
25
26config ACPI_I2C_OPREGION
27	bool "ACPI I2C Operation region support"
28	depends on I2C=y && ACPI
29	default y
30	help
31	  Say Y here if you want to enable ACPI I2C operation region support.
32	  Operation Regions allow firmware (BIOS) code to access I2C slave devices,
33	  such as smart batteries through an I2C host controller driver.
34
35if I2C
36
37config I2C_BOARDINFO
38	boolean
39	default y
40
41config I2C_COMPAT
42	boolean "Enable compatibility bits for old user-space"
43	default y
44	help
45	  Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
46	  other user-space package which expects i2c adapters to be class
47	  devices. If you don't know, say Y.
48
49config I2C_CHARDEV
50	tristate "I2C device interface"
51	help
52	  Say Y here to use i2c-* device files, usually found in the /dev
53	  directory on your system.  They make it possible to have user-space
54	  programs use the I2C bus.  Information on how to do this is
55	  contained in the file <file:Documentation/i2c/dev-interface>.
56
57	  This support is also available as a module.  If so, the module 
58	  will be called i2c-dev.
59
60config I2C_MUX
61	tristate "I2C bus multiplexing support"
62	depends on HAS_IOMEM
63	help
64	  Say Y here if you want the I2C core to support the ability to
65	  handle multiplexed I2C bus topologies, by presenting each
66	  multiplexed segment as a I2C adapter.
67
68	  This support is also available as a module.  If so, the module
69	  will be called i2c-mux.
70
71source drivers/i2c/muxes/Kconfig
72
73config I2C_HELPER_AUTO
74	bool "Autoselect pertinent helper modules"
75	default y
76	help
77	  Some I2C bus drivers require so-called "I2C algorithm" modules
78	  to work. These are basically software-only abstractions of generic
79	  I2C interfaces. This option will autoselect them so that you don't
80	  have to care.
81
82	  Unselect this only if you need to enable additional helper
83	  modules, for example for use with external I2C bus drivers.
84
85	  In doubt, say Y.
86
87config I2C_SMBUS
88	tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
89	help
90	  Say Y here if you want support for SMBus extensions to the I2C
91	  specification. At the moment, the only supported extension is
92	  the SMBus alert protocol.
93
94	  This support is also available as a module.  If so, the module
95	  will be called i2c-smbus.
96
97source drivers/i2c/algos/Kconfig
98source drivers/i2c/busses/Kconfig
99
100config I2C_STUB
101	tristate "I2C/SMBus Test Stub"
102	depends on m
103	default 'n'
104	help
105	  This module may be useful to developers of SMBus client drivers,
106	  especially for certain kinds of sensor chips.
107
108	  If you do build this module, be sure to read the notes and warnings
109	  in <file:Documentation/i2c/i2c-stub>.
110
111	  If you don't know what to do here, definitely say N.
112
113config I2C_DEBUG_CORE
114	bool "I2C Core debugging messages"
115	help
116	  Say Y here if you want the I2C core to produce a bunch of debug
117	  messages to the system log.  Select this if you are having a
118	  problem with I2C support and want to see more of what is going on.
119
120config I2C_DEBUG_ALGO
121	bool "I2C Algorithm debugging messages"
122	help
123	  Say Y here if you want the I2C algorithm drivers to produce a bunch
124	  of debug messages to the system log.  Select this if you are having
125	  a problem with I2C support and want to see more of what is going
126	  on.
127
128config I2C_DEBUG_BUS
129	bool "I2C Bus debugging messages"
130	depends on HAS_IOMEM
131	help
132	  Say Y here if you want the I2C bus drivers to produce a bunch of
133	  debug messages to the system log.  Select this if you are having
134	  a problem with I2C support and want to see more of what is going
135	  on.
136
137endif # I2C
138
139endmenu
140