/* SPDX-License-Identifier: CC-BY-SA-4.0 */

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#libcamera div.toctree-wrapper {
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</pre></td>
<td class='lines'><pre><code><span class="hl com">/* SPDX-License-Identifier: LGPL-2.1-or-later */</span>
<span class="hl com">/*</span>
<span class="hl com"> * Copyright (C) 2018, Google Inc.</span>
<span class="hl com"> *</span>
<span class="hl com"> * device_enumerator.cpp - Enumeration and matching</span>
<span class="hl com"> */</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;device_enumerator.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;device_enumerator_sysfs.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;device_enumerator_udev.h&quot;</span><span class="hl ppc"></span>

<span class="hl ppc">#include &lt;string.h&gt;</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;log.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;media_device.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;utils.h&quot;</span><span class="hl ppc"></span>

<span class="hl com">/**</span>
<span class="hl com"> * \file device_enumerator.h</span>
<span class="hl com"> * \brief Enumeration and matching of media devices</span>
<span class="hl com"> *</span>
<span class="hl com"> * The purpose of device enumeration and matching is to find media devices in</span>
<span class="hl com"> * the system and map them to pipeline handlers.</span>
<span class="hl com"> *</span>
<span class="hl com"> * At the core of the enumeration is the DeviceEnumerator class, responsible</span>
<span class="hl com"> * for enumerating all media devices in the system. It handles all interactions</span>
<span class="hl com"> * with the operating system in a platform-specific way. For each media device</span>
<span class="hl com"> * found an instance of MediaDevice is created to store information about the</span>
<span class="hl com"> * device gathered from the kernel through the Media Controller API.</span>
<span class="hl com"> *</span>
<span class="hl com"> * The DeviceEnumerator can enumerate all or specific media devices in the</span>
<span class="hl com"> * system. When a new media device is added the enumerator creates a</span>
<span class="hl com"> * corresponding MediaDevice instance.</span>
<span class="hl com"> *</span>
<span class="hl com"> * The enumerator supports searching among enumerated devices based on criteria</span>
<span class="hl com"> * expressed in a DeviceMatch object.</span>
<span class="hl com"> *</span>
<span class="hl com"> * \todo Add sysfs based device enumerator.</span>
<span class="hl com"> */</span>

<span class="hl kwa">namespace</span> libcamera <span class="hl opt">{</span>

<span class="hl kwd">LOG_DEFINE_CATEGORY</span><span class="hl opt">(</span>DeviceEnumerator<span class="hl opt">)</span>

<span class="hl com">/**</span>
<span class="hl com"> * \class DeviceMatch</span>
<span class="hl com"> * \brief Description of a media device search pattern</span>
<span class="hl com"> *</span>
<span class="hl com"> * The DeviceMatch class describes a media device using properties from the</span>
<span class="hl com"> * Media Controller struct media_device_info, entity names in the media graph</span>
<span class="hl com"> * or other properties that can be used to identify a media device.</span>
<span class="hl com"> *</span>
<span class="hl com"> * The description is meant to be filled by pipeline managers and passed to a</span>
<span class="hl com"> * device enumerator to find matching media devices.</span>
<span class="hl com"> *</span>
<span class="hl com"> * A DeviceMatch is created with a specific Linux device driver in mind,</span>
<span class="hl com"> * therefore the name of the driver is a required property. One or more Entity</span>
<span class="hl com"> * names can be added as match criteria.</span>
<span class="hl com"> *</span>
<span class="hl com"> * Pipeline handlers are recommended to add entities to DeviceMatch as</span>
<span class="hl com"> * appropriare to ensure that the media device they need can be uniquely</span>
<span class="hl com"> * identified. This is useful when the corresponding kernel driver can produce</span>
<span class="hl com"> * different graphs, for instance as a result of different driver versions or</span>
<span class="hl com"> * hardware configurations, and not all those graphs are suitable for a pipeline</span>
<span class="hl com"> * handler.</span>
<span class="hl com"> */</span>

<span class="hl com">/**</span>
<span class="hl com"> * \brief Construct a media device search pattern</span>
<span class="hl com"> * \param[in] driver The Linux device driver name that created the media device</span>
<span class="hl com"> */</span>
<span class="hl kwc">DeviceMatch</span><span class="hl opt">::</span><span class="hl kwd">DeviceMatch</span><span class="hl opt">(</span><span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>string <span class="hl opt">&amp;</span>driver<span class="hl opt">)</span>
	<span class="hl opt">:</span> <span class="hl kwd">driver_</span><span class="hl opt">(</span>driver<span class="hl opt">)</span>
<span class="hl opt">{</span>
<span class="hl opt">}</span>

<span class="hl com">/**</span>
<span class="hl com"> * \brief Add a media entity name to the search pattern</span>
<span class="hl com"> * \param[in] entity The name of the entity in the media graph</span>
<span class="hl com"> */</span>
<span class="hl kwb">void</span> <span class="hl kwc">DeviceMatch</span><span class="hl opt">::</span><span class="hl kwd">add</span><span class="hl opt">(</span><span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>string <span class="hl opt">&amp;</span>entity<span class="hl opt">)</span>
<span class="hl opt">{</span>
	entities_<span class="hl opt">.</span><span class="hl kwd">push_back</span><span class="hl opt">(</span>entity<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl com">/**</span>
<span class="hl com"> * \brief Compare a search pattern with a media device</span>
<span class="hl com"> * \param[in] device The media device</span>
<span class="hl com"> *</span>
<span class="hl com"> * Matching is performed on the Linux device driver name and entity names from</span>
<span class="hl com"> * the media graph. A match is found if both the driver name matches and the</span>
<span class="hl com"> * media device contains all the entities listed in the search pattern.</span>
<span class="hl com"> *</span>
<span class="hl com"> * \return true if the media device matches the search pattern, false otherwise