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+<table class="head">
+ <tr>
+ <td class="head-ltitle">CP2112(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">CP2112(4)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">cp2112</code> &#x2014; <span class="Nd">driver
+ for a USB GPIO and I2C peripheral device</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device cp2112</code>
+<br/>
+<code class="Cd">device usb</code>
+<br/>
+<code class="Cd">device gpio</code>
+<br/>
+<code class="Cd">device iicbus</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>cp2112_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">cp2112</code> 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.</p>
+<p class="Pp">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
+ <code class="Nm">cp2112</code> driver does not provide a way to enable and
+ configure the special functions.</p>
+<p class="Pp">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 <code class="Nm">cp2112</code> driver creates a
+ <a class="Xr">gpio(4)</a> and <a class="Xr">iicbus(4)</a> child buses to
+ expose the respective functions.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">gpio(4)</a>, <a class="Xr">iicbus(4)</a>,
+ <a class="Xr">usb(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">cp2112</code> driver and this manual page was
+ written by <span class="An">Andriy Gapon</span>
+ &lt;<a class="Mt" href="mailto:avg@FreeBSD.org">avg@FreeBSD.org</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">August 12, 2020</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>