2 .\" SPDX-License-Identifier: BSD-2-Clause
4 .\" Copyright (c) 2020 Andriy Gapon <avg@FreeBSD.org>
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7 .\" modification, are permitted provided that the following conditions
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34 .Nd driver for a USB GPIO and I2C peripheral device
36 To compile this driver into the kernel,
37 place the following lines in your
38 kernel configuration file:
39 .Bd -ragged -offset indent
46 Alternatively, to load the driver as a
47 module at boot time, place the following line in
49 .Bd -literal -offset indent
55 driver provides support for Silicon Labs CP2112 device.
56 The device has 8 general purpose I/O pins and an I2C controller that supports
57 a subset of the I2C protocol.
59 All pins support both input and output modes.
60 An output pin can be configured either for open-drain or push-pull operation.
61 Pins 0, 1 and 7 support special functions: I2C transmit indication,
62 I2C receive indication and clock output respectively.
65 driver does not provide a way to enable and configure the special functions.
67 The I2C controller supports read transactions with up to 512 bytes of data,
68 write transactions with up to 61 bytes of data and a write followed by
69 the repeated start followed by a read transactions where the write can be
70 up to 16 bytes and the read can be up to 512 bytes.
71 Zero length transfers are not supported.
78 child buses to expose the respective functions.
86 driver and this manual page was written by
87 .An Andriy Gapon Aq Mt avg@FreeBSD.org .