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_CHARDEV 31 tristate "I2C device interface" 32 help 33 Say Y here to use i2c-* device files, usually found in the /dev 34 directory on your system. They make it possible to have user-space 35 programs use the I2C bus. Information on how to do this is 36 contained in the file <file:Documentation/i2c/dev-interface>. 37 38 This support is also available as a module. If so, the module 39 will be called i2c-dev. 40 41config I2C_HELPER_AUTO 42 bool "Autoselect pertinent helper modules" 43 default y 44 help 45 Some I2C bus drivers require so-called "I2C algorithm" modules 46 to work. These are basically software-only abstractions of generic 47 I2C interfaces. This option will autoselect them so that you don't 48 have to care. 49 50 Unselect this only if you need to enable additional helper 51 modules, for example for use with external I2C bus drivers. 52 53 In doubt, say Y. 54 55source drivers/i2c/algos/Kconfig 56source drivers/i2c/busses/Kconfig 57source drivers/i2c/chips/Kconfig 58 59config I2C_DEBUG_CORE 60 bool "I2C Core debugging messages" 61 help 62 Say Y here if you want the I2C core to produce a bunch of debug 63 messages to the system log. Select this if you are having a 64 problem with I2C support and want to see more of what is going on. 65 66config I2C_DEBUG_ALGO 67 bool "I2C Algorithm debugging messages" 68 help 69 Say Y here if you want the I2C algorithm drivers to produce a bunch 70 of debug messages to the system log. Select this if you are having 71 a problem with I2C support and want to see more of what is going 72 on. 73 74config I2C_DEBUG_BUS 75 bool "I2C Bus debugging messages" 76 help 77 Say Y here if you want the I2C bus drivers to produce a bunch of 78 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_CHIP 83 bool "I2C Chip debugging messages" 84 help 85 Say Y here if you want the I2C chip 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 90endif # I2C 91