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+<table class="head">
+ <tr>
+ <td class="head-ltitle">ATOPCASE(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">ATOPCASE(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">atopcase</code> &#x2014; <span class="Nd">Apple
+ HID-over-SPI transport driver</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 atopcase</code>
+<br/>
+<code class="Cd">device intelspi</code>
+<br/>
+<code class="Cd">device spibus</code>
+<br/>
+<code class="Cd">device hidbus</code>
+<br/>
+<code class="Cd">device hkbd</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>atopcase_load=&quot;YES&quot;
+hkbd_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">atopcase</code> driver provides support for
+ Human Interface Devices (HID) on Serial Peripheral Interface (SPI) buses on
+ Apple Intel Macs.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">atopcase</code> driver supports the following
+ MacBooks produced in 2015-2018 years:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bl-compact">
+ <li>Macbook8,1</li>
+ <li>Macbook9,1</li>
+ <li>Macbook10,1</li>
+ <li>MacbookPro11,4</li>
+ <li>MacbookPro12,1</li>
+ <li>MacbookPro13,1</li>
+ <li>MacbookPro13,2</li>
+ <li>MacbookPro13,3</li>
+ <li>MacbookPro14,1</li>
+ <li>MacbookPro14,2</li>
+ <li>MacbookPro14,3</li>
+</ul>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
+ VARIABLES</a></h1>
+<p class="Pp">The following variables are available as both
+ <a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
+ tunables:</p>
+<dl class="Bl-tag">
+ <dt id="hw.hid.atopcase.debug"><var class="Va">hw.hid.atopcase.debug</var></dt>
+ <dd>Debug output level, where 0 is debugging disabled and larger values
+ increase debug message verbosity. Default is 0.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
+<dl class="Bl-tag Bl-compact">
+ <dt><span class="Pa">/dev/backlight/atopcase0</span></dt>
+ <dd>Keyboard <a class="Xr">backlight(8)</a> device node.</dd>
+</dl>
+</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">acpi(4)</a>, <a class="Xr">loader.conf(5)</a>,
+ <a class="Xr">backlight(8)</a>, <a class="Xr">loader(8)</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">atopcase</code> driver first appeared in
+ <span class="Ux">FreeBSD 14.0</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">The <code class="Nm">atopcase</code> driver was originally written
+ by <span class="An">Val Packett</span>
+ &lt;<a class="Mt" href="mailto:val@packett.cool">val@packett.cool</a>&gt;
+ and marginally improved upon by <span class="An">Vladimir Kondratyev</span>
+ &lt;<a class="Mt" href="mailto:wulf@FreeBSD.org">wulf@FreeBSD.org</a>&gt;.</p>
+<p class="Pp">This manual page was written by <span class="An">Vladimir
+ Kondratyev</span>
+ &lt;<a class="Mt" href="mailto:wulf@FreeBSD.org">wulf@FreeBSD.org</a>&gt;.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">Device interrupts are not acknowledged on some hardware that
+ results in interrupt storm. Installation of Darwin OSI in
+ <a class="Xr">acpi(4)</a> driver fixes the issue. To install Darwin OSI add
+ following lines to <a class="Xr">loader.conf(5)</a>:</p>
+<dl class="Bl-tag">
+ <dt id="hw.acpi.install_interface=_Darwin_"><var class="Va">hw.acpi.install_interface=&quot;Darwin&quot;</var></dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+ <dt id="hw.acpi.remove_interface=_Windows"><var class="Va">hw.acpi.remove_interface=&quot;Windows
+ 2009, Windows 2012&quot;</var></dt>
+ <dd style="width: auto;">&#x00A0;</dd>
+</dl>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">August 17, 2023</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>