1# 2# I2C subsystem configuration 3# 4 5menuconfig 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 24if I2C 25 26config I2C_BOARDINFO 27 boolean 28 default y 29 30config I2C_COMPAT 31 boolean "Enable compatibility bits for old user-space" 32 default y 33 help 34 Say Y here if you intend to run lm-sensors 3.1.1 or older, or any 35 other user-space package which expects i2c adapters to be class 36 devices. If you don't know, say Y. 37 38config I2C_CHARDEV 39 tristate "I2C device interface" 40 help 41 Say Y here to use i2c-* device files, usually found in the /dev 42 directory on your system. They make it possible to have user-space 43 programs use the I2C bus. Information on how to do this is 44 contained in the file <file:Documentation/i2c/dev-interface>. 45 46 This support is also available as a module. If so, the module 47 will be called i2c-dev. 48 49config I2C_HELPER_AUTO 50 bool "Autoselect pertinent helper modules" 51 default y 52 help 53 Some I2C bus drivers require so-called "I2C algorithm" modules 54 to work. These are basically software-only abstractions of generic 55 I2C interfaces. This option will autoselect them so that you don't 56 have to care. 57 58 Unselect this only if you need to enable additional helper 59 modules, for example for use with external I2C bus drivers. 60 61 In doubt, say Y. 62 63source drivers/i2c/algos/Kconfig 64source drivers/i2c/busses/Kconfig 65source drivers/i2c/chips/Kconfig 66 67config I2C_DEBUG_CORE 68 bool "I2C Core debugging messages" 69 help 70 Say Y here if you want the I2C core to produce a bunch of debug 71 messages to the system log. Select this if you are having a 72 problem with I2C support and want to see more of what is going on. 73 74config I2C_DEBUG_ALGO 75 bool "I2C Algorithm debugging messages" 76 help 77 Say Y here if you want the I2C algorithm drivers to produce a bunch 78 of 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 82config I2C_DEBUG_BUS 83 bool "I2C Bus debugging messages" 84 help 85 Say Y here if you want the I2C bus 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 90config I2C_DEBUG_CHIP 91 bool "I2C Chip debugging messages" 92 help 93 Say Y here if you want the I2C chip drivers to produce a bunch of 94 debug messages to the system log. Select this if you are having 95 a problem with I2C support and want to see more of what is going 96 on. 97 98endif # I2C 99