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author | Frederic Weisbecker | 2009-10-18 01:09:09 +0200 |
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committer | Frederic Weisbecker | 2009-10-18 01:12:33 +0200 |
commit | 0f8f86c7bdd1c954fbe153af437a0d91a6c5721a (patch) | |
tree | 94a8d419a470a4f9852ca397bb9bbe48db92ff5c /Documentation/DocBook/v4l/vidioc-g-std.xml | |
parent | Merge branch 'linus' into tracing/hw-breakpoints (diff) | |
parent | perf tools: Move dereference after NULL test (diff) | |
download | kernel-qcow2-linux-0f8f86c7bdd1c954fbe153af437a0d91a6c5721a.tar.gz kernel-qcow2-linux-0f8f86c7bdd1c954fbe153af437a0d91a6c5721a.tar.xz kernel-qcow2-linux-0f8f86c7bdd1c954fbe153af437a0d91a6c5721a.zip |
Merge commit 'perf/core' into perf/hw-breakpoint
Conflicts:
kernel/Makefile
kernel/trace/Makefile
kernel/trace/trace.h
samples/Makefile
Merge reason: We need to be uptodate with the perf events development
branch because we plan to rewrite the breakpoints API on top of
perf events.
Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-g-std.xml')
-rw-r--r-- | Documentation/DocBook/v4l/vidioc-g-std.xml | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-g-std.xml b/Documentation/DocBook/v4l/vidioc-g-std.xml new file mode 100644 index 000000000000..b6f5d267e856 --- /dev/null +++ b/Documentation/DocBook/v4l/vidioc-g-std.xml @@ -0,0 +1,99 @@ +<refentry id="vidioc-g-std"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_STD, VIDIOC_S_STD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_STD</refname> + <refname>VIDIOC_S_STD</refname> + <refpurpose>Query or select the video standard of the current input</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>v4l2_std_id +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const v4l2_std_id +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_STD, VIDIOC_S_STD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query and select the current video standard applications +use the <constant>VIDIOC_G_STD</constant> and <constant>VIDIOC_S_STD</constant> ioctls which take a pointer to a +&v4l2-std-id; type as argument. <constant>VIDIOC_G_STD</constant> can +return a single flag or a set of flags as in &v4l2-standard; field +<structfield>id</structfield>. The flags must be unambiguous such +that they appear in only one enumerated <structname>v4l2_standard</structname> structure.</para> + + <para><constant>VIDIOC_S_STD</constant> accepts one or more +flags, being a write-only ioctl it does not return the actual new standard as +<constant>VIDIOC_G_STD</constant> does. When no flags are given or +the current input does not support the requested standard the driver +returns an &EINVAL;. When the standard set is ambiguous drivers may +return <errorcode>EINVAL</errorcode> or choose any of the requested +standards.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>This ioctl is not supported, or the +<constant>VIDIOC_S_STD</constant> parameter was unsuitable.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> + +<!-- +Local Variables: +mode: sgml +sgml-parent-document: "v4l2.sgml" +indent-tabs-mode: nil +End: +--> |