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Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-log-status.xml')
-rw-r--r-- | Documentation/DocBook/v4l/vidioc-log-status.xml | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-log-status.xml b/Documentation/DocBook/v4l/vidioc-log-status.xml new file mode 100644 index 000000000000..2634b7c88b58 --- /dev/null +++ b/Documentation/DocBook/v4l/vidioc-log-status.xml | |||
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1 | <refentry id="vidioc-log-status"> | ||
2 | <refmeta> | ||
3 | <refentrytitle>ioctl VIDIOC_LOG_STATUS</refentrytitle> | ||
4 | &manvol; | ||
5 | </refmeta> | ||
6 | |||
7 | <refnamediv> | ||
8 | <refname>VIDIOC_LOG_STATUS</refname> | ||
9 | <refpurpose>Log driver status information</refpurpose> | ||
10 | </refnamediv> | ||
11 | |||
12 | <refsynopsisdiv> | ||
13 | <funcsynopsis> | ||
14 | <funcprototype> | ||
15 | <funcdef>int <function>ioctl</function></funcdef> | ||
16 | <paramdef>int <parameter>fd</parameter></paramdef> | ||
17 | <paramdef>int <parameter>request</parameter></paramdef> | ||
18 | </funcprototype> | ||
19 | </funcsynopsis> | ||
20 | </refsynopsisdiv> | ||
21 | |||
22 | <refsect1> | ||
23 | <title>Description</title> | ||
24 | |||
25 | <para>As the video/audio devices become more complicated it | ||
26 | becomes harder to debug problems. When this ioctl is called the driver | ||
27 | will output the current device status to the kernel log. This is | ||
28 | particular useful when dealing with problems like no sound, no video | ||
29 | and incorrectly tuned channels. Also many modern devices autodetect | ||
30 | video and audio standards and this ioctl will report what the device | ||
31 | thinks what the standard is. Mismatches may give an indication where | ||
32 | the problem is.</para> | ||
33 | |||
34 | <para>This ioctl is optional and not all drivers support it. It | ||
35 | was introduced in Linux 2.6.15.</para> | ||
36 | </refsect1> | ||
37 | |||
38 | <refsect1> | ||
39 | &return-value; | ||
40 | |||
41 | <variablelist> | ||
42 | <varlistentry> | ||
43 | <term><errorcode>EINVAL</errorcode></term> | ||
44 | <listitem> | ||
45 | <para>The driver does not support this ioctl.</para> | ||
46 | </listitem> | ||
47 | </varlistentry> | ||
48 | </variablelist> | ||
49 | </refsect1> | ||
50 | </refentry> | ||
51 | |||
52 | <!-- | ||
53 | Local Variables: | ||
54 | mode: sgml | ||
55 | sgml-parent-document: "v4l2.sgml" | ||
56 | indent-tabs-mode: nil | ||
57 | End: | ||
58 | --> | ||