59 lines
1.5 KiB
XML
59 lines
1.5 KiB
XML
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<refentry id="vidioc-log-status">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_LOG_STATUS</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_LOG_STATUS</refname>
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<refpurpose>Log driver status information</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>As the video/audio devices become more complicated it
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becomes harder to debug problems. When this ioctl is called the driver
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will output the current device status to the kernel log. This is
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particular useful when dealing with problems like no sound, no video
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and incorrectly tuned channels. Also many modern devices autodetect
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video and audio standards and this ioctl will report what the device
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thinks what the standard is. Mismatches may give an indication where
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the problem is.</para>
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<para>This ioctl is optional and not all drivers support it. It
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was introduced in Linux 2.6.15.</para>
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</refsect1>
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<refsect1>
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&return-value;
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<variablelist>
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<varlistentry>
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<term><errorcode>EINVAL</errorcode></term>
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<listitem>
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<para>The driver does not support this ioctl.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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</refentry>
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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "v4l2.sgml"
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indent-tabs-mode: nil
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End:
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-->
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