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CP2112(4)	       FreeBSD Kernel Interfaces Manual		     CP2112(4)

NAME
     cp2112 -- driver for a USB	GPIO and I2C peripheral	device

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

	   device cp2112
	   device usb
	   device gpio
	   device iicbus

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

	   cp2112_load="YES"

DESCRIPTION
     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 con-
     figured either for	open-drain or push-pull	operation.  Pins 0, 1 and 7
     support special functions:	I2C transmit indication, I2C receive indica-
     tion 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.

SEE ALSO
     gpio(4), iicbus(4), usb(4)

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

FreeBSD	13.0			August 12, 2020			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY

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