cp2112 — driver for a USB GPIO and I2C peripheral device

       The  cp2112 driver provides support for Silicon Labs CP2112 device.  The device has 8 general purpose I/O
       pins and an I2C controller that supports a subset of the I2C protocol.

       All pins support both input and output modes.  An output pin can be configured either for  open-drain  or
       push-pull  operation.   Pins  0,  1 and 7 support special functions: I2C transmit indication, I2C receive
       indication and clock output respectively.  At the moment the cp2112 driver does  not  provide  a  way  to
       enable and configure the special functions.

       The I2C controller supports read transactions with up to 512 bytes of data, write transactions with up to
       61  bytes  of  data  and a write followed by the repeated start followed by a read transactions where the
       write can be up to 16 bytes and the read can  be  up  to  512  bytes.   Zero  length  transfers  are  not
       supported.   The  cp2112  driver  creates  a  gpio(4)  and iicbus(4) child buses to expose the respective
       functions.

       The cp2112 driver and this manual page was written by Andriy Gapon <avg@FreeBSD.org>.

Debian                                           August 12, 2020                                       CP2112(4)

       cp2112 — driver for a USB GPIO and I2C peripheral device

gpio(4), iicbus(4), usb(4)

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

             devicecp2112deviceusbdevicegpiodeviceiicbus

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

             cp2112_load="YES"