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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml')
-rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml b/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml deleted file mode 100644 index ee2820d6ca66..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml +++ /dev/null @@ -1,133 +0,0 @@ -<refentry id="vidioc-g-ctrl"> - <refmeta> - <refentrytitle>ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_G_CTRL</refname> - <refname>VIDIOC_S_CTRL</refname> - <refpurpose>Get or set the value of a control</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcprototype> - <funcdef>int <function>ioctl</function></funcdef> - <paramdef>int <parameter>fd</parameter></paramdef> - <paramdef>int <parameter>request</parameter></paramdef> - <paramdef>struct v4l2_control -*<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_CTRL, VIDIOC_S_CTRL</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <para>To get the current value of a control applications -initialize the <structfield>id</structfield> field of a struct -<structname>v4l2_control</structname> and call the -<constant>VIDIOC_G_CTRL</constant> ioctl with a pointer to this -structure. To change the value of a control applications initialize -the <structfield>id</structfield> and <structfield>value</structfield> -fields of a struct <structname>v4l2_control</structname> and call the -<constant>VIDIOC_S_CTRL</constant> ioctl.</para> - - <para>When the <structfield>id</structfield> is invalid drivers -return an &EINVAL;. When the <structfield>value</structfield> is out -of bounds drivers can choose to take the closest valid value or return -an &ERANGE;, whatever seems more appropriate. However, -<constant>VIDIOC_S_CTRL</constant> is a write-only ioctl, it does not -return the actual new value. If the <structfield>value</structfield> -is inappropriate for the control (e.g. if it refers to an unsupported -menu index of a menu control), then &EINVAL; is returned as well.</para> - - <para>These ioctls work only with user controls. For other -control classes the &VIDIOC-G-EXT-CTRLS;, &VIDIOC-S-EXT-CTRLS; or -&VIDIOC-TRY-EXT-CTRLS; must be used.</para> - - <table pgwide="1" frame="none" id="v4l2-control"> - <title>struct <structname>v4l2_control</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>id</structfield></entry> - <entry>Identifies the control, set by the -application.</entry> - </row> - <row> - <entry>__s32</entry> - <entry><structfield>value</structfield></entry> - <entry>New value or current value.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - - <variablelist> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The &v4l2-control; <structfield>id</structfield> is -invalid or the <structfield>value</structfield> is inappropriate for -the given control (i.e. if a menu item is selected that is not supported -by the driver according to &VIDIOC-QUERYMENU;).</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>ERANGE</errorcode></term> - <listitem> - <para>The &v4l2-control; <structfield>value</structfield> -is out of bounds.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EBUSY</errorcode></term> - <listitem> - <para>The control is temporarily not changeable, possibly -because another applications took over control of the device function -this control belongs to.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EACCES</errorcode></term> - <listitem> - <para>Attempt to set a read-only control or to get a - write-only control.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |