1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>struct dvb_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="ch06s02.html" title="Digital TV (DVB) devices"><link rel="prev" href="API-struct-dvb-adapter.html" title="struct dvb_adapter"><link rel="next" href="API-dvb-register-adapter.html" title="dvb_register_adapter"></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 dvb_device</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-dvb-adapter.html">Prev</a> </td><th width="60%" align="center">Digital TV (DVB) devices</th><td width="20%" align="right"> <a accesskey="n" href="API-dvb-register-adapter.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-dvb-device"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct dvb_device — 
2     represents a DVB device node
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting">
4struct dvb_device {
5  struct list_head list_head;
6  const struct file_operations * fops;
7  struct dvb_adapter * adapter;
8  int type;
9  int minor;
10  u32 id;
11  int readers;
12  int writers;
13  int users;
14  wait_queue_head_t wait_queue;
15  int (* kernel_ioctl) (struct file *file, unsigned int cmd, void *arg);
16#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
17  const char * name;
18  struct media_entity * entity;
19  struct media_pad * pads;
20#endif
21  void * priv;
22};  </pre></div><div class="refsect1"><a name="id-1.8.3.27.5"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">list_head</span></dt><dd><p>
23   List head with all DVB devices
24      </p></dd><dt><span class="term">fops</span></dt><dd><p>
25   pointer to struct file_operations
26      </p></dd><dt><span class="term">adapter</span></dt><dd><p>
27   pointer to the adapter that holds this device node
28      </p></dd><dt><span class="term">type</span></dt><dd><p>
29   type of the device: DVB_DEVICE_SEC, DVB_DEVICE_FRONTEND,
30   DVB_DEVICE_DEMUX, DVB_DEVICE_DVR, DVB_DEVICE_CA, DVB_DEVICE_NET
31      </p></dd><dt><span class="term">minor</span></dt><dd><p>
32   devnode minor number. Major number is always DVB_MAJOR.
33      </p></dd><dt><span class="term">id</span></dt><dd><p>
34   device ID number, inside the adapter
35      </p></dd><dt><span class="term">readers</span></dt><dd><p>
36   Initialized by the caller. Each call to <code class="function">open</code> in Read Only mode
37   decreases this counter by one.
38      </p></dd><dt><span class="term">writers</span></dt><dd><p>
39   Initialized by the caller. Each call to <code class="function">open</code> in Read/Write
40   mode decreases this counter by one.
41      </p></dd><dt><span class="term">users</span></dt><dd><p>
42   Initialized by the caller. Each call to <code class="function">open</code> in any mode
43   decreases this counter by one.
44      </p></dd><dt><span class="term">wait_queue</span></dt><dd><p>
45   wait queue, used to wait for certain events inside one of
46   the DVB API callers
47      </p></dd><dt><span class="term">kernel_ioctl</span></dt><dd><p>
48   callback function used to handle ioctl calls from userspace.
49      </p></dd><dt><span class="term">name</span></dt><dd><p>
50   Name to be used for the device at the Media Controller
51      </p></dd><dt><span class="term">entity</span></dt><dd><p>
52   pointer to struct media_entity associated with the device node
53      </p></dd><dt><span class="term">pads</span></dt><dd><p>
54   pointer to struct media_pad associated with <em class="parameter"><code>entity</code></em>;
55      </p></dd><dt><span class="term">priv</span></dt><dd><p>
56   private data
57      </p></dd></dl></div></div><div class="refsect1"><a name="id-1.8.3.27.6"></a><h2>Description</h2><p>
58   This structure is used by the DVB core (frontend, CA, net, demux) in
59   order to create the device nodes. Usually, driver should not initialize
60   this struct diretly.
61</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-dvb-adapter.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06s02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-dvb-register-adapter.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct dvb_adapter</span> </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">dvb_register_adapter</span></td></tr></table></div></body></html>
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