ig4 — Synopsys DesignWare I2C Controller

       The ig4 driver was written for DragonFly BSD by Matthew Dillon and  subsequently  ported  to  FreeBSD  by
       Michael Gmelin <freebsd@grem.de>.

       This manual page was written by Michael Gmelin <freebsd@grem.de>.

Debian                                         September 13, 2018                                         IG4(4)

       The ig4 driver provides access to peripherals attached to an I2C controller.

ig4  supports  the I2C controllers based on Synopsys DesignWare IP that can be found in Intel(R) Core(TM)
       processors starting from the fourth generation, Intel(R) Bay Trail, Apollo Lake SoC  families,  and  some
       AMD systems.

       ig4 — Synopsys DesignWare I2C Controller

iic(4), iicbus(4)

       To compile this driver into the kernel, place the following lines into the kernel configuration file:

             deviceig4deviceiicbus

       Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

             ig4_load="YES"

       These sysctl(8) variables are available:

       debug.ig4_dump  This  sysctl  is a zero-based bit mask.  When any of the bits are set, a register dump is
                       printed for every I2C transfer on an ig4 device with the same unit number.