1# 2# I2C subsystem configuration 3# 4 5menu "I2C support" 6 7config I2C 8 tristate "I2C support" 9 select RT_MUTEXES 10 select IRQ_DOMAIN 11 ---help--- 12 I2C (pronounce: I-squared-C) is a slow serial bus protocol used in 13 many micro controller applications and developed by Philips. SMBus, 14 or System Management Bus is a subset of the I2C protocol. More 15 information is contained in the directory <file:Documentation/i2c/>, 16 especially in the file called "summary" there. 17 18 Both I2C and SMBus are supported here. You will need this for 19 hardware sensors support, and also for Video For Linux support. 20 21 If you want I2C support, you should say Y here and also to the 22 specific driver for your bus adapter(s) below. 23 24 This I2C support can also be built as a module. If so, the module 25 will be called i2c-core. 26 27config ACPI_I2C_OPREGION 28 bool "ACPI I2C Operation region support" 29 depends on I2C=y && ACPI 30 default y 31 help 32 Say Y here if you want to enable ACPI I2C operation region support. 33 Operation Regions allow firmware (BIOS) code to access I2C slave devices, 34 such as smart batteries through an I2C host controller driver. 35 36if I2C 37 38config I2C_BOARDINFO 39 bool 40 default y 41 42config I2C_COMPAT 43 bool "Enable compatibility bits for old user-space" 44 default y 45 help 46 Say Y here if you intend to run lm-sensors 3.1.1 or older, or any 47 other user-space package which expects i2c adapters to be class 48 devices. If you don't know, say Y. 49 50config I2C_CHARDEV 51 tristate "I2C device interface" 52 help 53 Say Y here to use i2c-* device files, usually found in the /dev 54 directory on your system. They make it possible to have user-space 55 programs use the I2C bus. Information on how to do this is 56 contained in the file <file:Documentation/i2c/dev-interface>. 57 58 This support is also available as a module. If so, the module 59 will be called i2c-dev. 60 61config I2C_MUX 62 tristate "I2C bus multiplexing support" 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, two extensions are supported: 92 the SMBus Alert protocol and the SMBus Host Notify 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_SLAVE 114 bool "I2C slave support" 115 116if I2C_SLAVE 117 118config I2C_SLAVE_EEPROM 119 tristate "I2C eeprom slave driver" 120 121endif 122 123config I2C_DEBUG_CORE 124 bool "I2C Core debugging messages" 125 help 126 Say Y here if you want the I2C core to produce a bunch of debug 127 messages to the system log. Select this if you are having a 128 problem with I2C support and want to see more of what is going on. 129 130config I2C_DEBUG_ALGO 131 bool "I2C Algorithm debugging messages" 132 help 133 Say Y here if you want the I2C algorithm drivers to produce a bunch 134 of debug messages to the system log. Select this if you are having 135 a problem with I2C support and want to see more of what is going 136 on. 137 138config I2C_DEBUG_BUS 139 bool "I2C Bus debugging messages" 140 depends on HAS_IOMEM 141 help 142 Say Y here if you want the I2C bus drivers to produce a bunch of 143 debug messages to the system log. Select this if you are having 144 a problem with I2C support and want to see more of what is going 145 on. 146 147endif # I2C 148 149endmenu 150