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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
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.
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 14.2-RELEASE August 12, 2020 FreeBSD 14.2-RELEASE