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-<table class="head">
- <tr>
- <td class="head-ltitle">ACPISMBUS(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">ACPISMBUS(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">acpismbus</code> &#x2014; <span class="Nd">ACPI
- SMBus Control Method Interface</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">acpismbus* at acpi?</code>
- <br/>
- <code class="Cd">iic* at acpismbus?</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">acpismbus</code> driver supports instances of
- the ACPI SMBus Control Method Interface. This enables i2c access to bus
- segments which might not otherwise be accessible due to missing
- &quot;native&quot; driver support. The SMBus Process Call protocol is not
- supported. All other SMBus protocols are supported to the extent that the
- underlying controller supports them.</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">acpi(4)</a>, <a class="Xr">iic(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">acpismbus</code> driver appeared in
- <span class="Ux">NetBSD 6.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Although <code class="Nm">acpismbus</code> SMBus Alerts can be
- associated with individual devices, this capability is ignored. When an
- <code class="Nm">acpismbus</code> SMBus Alert is generated, all devices on
- the i2c bus segment which have registered an interrupt routine are
- notified.</p>
-<p class="Pp">The SMBus CMI protocol defines a method to provide a list of
- devices on an i2c bus segment and their addresses. The
- <code class="Nm">acpismbus</code> driver makes no attempt to retrieve or
- process this device list.</p>
-<p class="Pp">There is currently no way to determine if the i2c controller
- managed by an instance of the ACPI SMBus CMI can also be accessed using a
- native device driver. Therefore, the <code class="Nm">acpismbus</code>
- driver should not be enabled by default. If both a native driver and the
- <code class="Nm">acpismbus</code> driver attempt to access the same i2c bus
- segment, the results are undefined.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">February 6, 2010</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>