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_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 64config I2C_SMBUS 65 tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO 66 help 67 Say Y here if you want support for SMBus extensions to the I2C 68 specification. At the moment, the only supported extension is 69 the SMBus alert protocol. 70 71 This support is also available as a module. If so, the module 72 will be called i2c-smbus. 73 74source drivers/i2c/algos/Kconfig 75source drivers/i2c/busses/Kconfig 76 77config I2C_DEBUG_CORE 78 bool "I2C Core debugging messages" 79 help 80 Say Y here if you want the I2C core to produce a bunch of debug 81 messages to the system log. Select this if you are having a 82 problem with I2C support and want to see more of what is going on. 83 84config I2C_DEBUG_ALGO 85 bool "I2C Algorithm debugging messages" 86 help 87 Say Y here if you want the I2C algorithm drivers to produce a bunch 88 of debug messages to the system log. Select this if you are having 89 a problem with I2C support and want to see more of what is going 90 on. 91 92config I2C_DEBUG_BUS 93 bool "I2C Bus debugging messages" 94 help 95 Say Y here if you want the I2C bus drivers to produce a bunch of 96 debug messages to the system log. Select this if you are having 97 a problem with I2C support and want to see more of what is going 98 on. 99 100endif # I2C 101