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-squared-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 help 53 Say Y here if you want the I2C core to support the ability to 54 handle multiplexed I2C bus topologies, by presenting each 55 multiplexed segment as a I2C adapter. 56 57 This support is also available as a module. If so, the module 58 will be called i2c-mux. 59 60source drivers/i2c/muxes/Kconfig 61 62config I2C_HELPER_AUTO 63 bool "Autoselect pertinent helper modules" 64 default y 65 help 66 Some I2C bus drivers require so-called "I2C algorithm" modules 67 to work. These are basically software-only abstractions of generic 68 I2C interfaces. This option will autoselect them so that you don't 69 have to care. 70 71 Unselect this only if you need to enable additional helper 72 modules, for example for use with external I2C bus drivers. 73 74 In doubt, say Y. 75 76config I2C_SMBUS 77 tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO 78 help 79 Say Y here if you want support for SMBus extensions to the I2C 80 specification. At the moment, the only supported extension is 81 the SMBus alert protocol. 82 83 This support is also available as a module. If so, the module 84 will be called i2c-smbus. 85 86source drivers/i2c/algos/Kconfig 87source drivers/i2c/busses/Kconfig 88 89config I2C_DEBUG_CORE 90 bool "I2C Core debugging messages" 91 help 92 Say Y here if you want the I2C core to produce a bunch of debug 93 messages to the system log. Select this if you are having a 94 problem with I2C support and want to see more of what is going on. 95 96config I2C_DEBUG_ALGO 97 bool "I2C Algorithm debugging messages" 98 help 99 Say Y here if you want the I2C algorithm drivers to produce a bunch 100 of debug messages to the system log. Select this if you are having 101 a problem with I2C support and want to see more of what is going 102 on. 103 104config I2C_DEBUG_BUS 105 bool "I2C Bus debugging messages" 106 help 107 Say Y here if you want the I2C bus drivers to produce a bunch of 108 debug messages to the system log. Select this if you are having 109 a problem with I2C support and want to see more of what is going 110 on. 111 112endif # I2C 113