1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>struct media_device</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch06s04.html" title="Media Controller devices"><link rel="prev" href="ch06s04.html" title="Media Controller devices"><link rel="next" href="API-struct-media-devnode.html" title="struct media_devnode"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct media_device</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch06s04.html">Prev</a> </td><th width="60%" align="center">Media Controller devices</th><td width="20%" align="right"> <a accesskey="n" href="API-struct-media-devnode.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-media-device"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct media_device — 
2  Media device
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting">
4struct media_device {
5  struct device * dev;
6  struct media_devnode devnode;
7  char model[32];
8  char serial[40];
9  char bus_info[32];
10  u32 hw_revision;
11  u32 driver_version;
12  u32 entity_id;
13  struct list_head entities;
14  spinlock_t lock;
15  struct mutex graph_mutex;
16  int (* link_notify) (struct media_link *link, u32 flags,unsigned int notification);
17};  </pre></div><div class="refsect1"><a name="id-1.8.5.2.5"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">dev</span></dt><dd><p>
18Parent device
19      </p></dd><dt><span class="term">devnode</span></dt><dd><p>
20Media device node
21      </p></dd><dt><span class="term">model[32]</span></dt><dd><p>
22Device model name
23      </p></dd><dt><span class="term">serial[40]</span></dt><dd><p>
24Device serial number (optional)
25      </p></dd><dt><span class="term">bus_info[32]</span></dt><dd><p>
26Unique and stable device location identifier
27      </p></dd><dt><span class="term">hw_revision</span></dt><dd><p>
28Hardware device revision
29      </p></dd><dt><span class="term">driver_version</span></dt><dd><p>
30Device driver version
31      </p></dd><dt><span class="term">entity_id</span></dt><dd><p>
32ID of the next entity to be registered
33      </p></dd><dt><span class="term">entities</span></dt><dd><p>
34List of registered entities
35      </p></dd><dt><span class="term">lock</span></dt><dd><p>
36Entities list lock
37      </p></dd><dt><span class="term">graph_mutex</span></dt><dd><p>
38Entities graph operation lock
39      </p></dd><dt><span class="term">link_notify</span></dt><dd><p>
40Link state change notification callback
41      </p></dd></dl></div></div><div class="refsect1"><a name="id-1.8.5.2.6"></a><h2>Description</h2><p>
42   This structure represents an abstract high-level media device. It allows easy
43   access to entities and provides basic media device-level support. The
44   structure can be allocated directly or embedded in a larger structure.
45   </p><p>
46
47   The parent <em class="parameter"><code>dev</code></em> is a physical device. It must be set before registering the
48   media device.
49   </p><p>
50
51   <em class="parameter"><code>model</code></em> is a descriptive model name exported through sysfs. It doesn't have to
52   be unique.
53</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch06s04.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06s04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-struct-media-devnode.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Media Controller devices </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">struct media_devnode</span></td></tr></table></div></body></html>
54