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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-g-frequency.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-g-frequency.xml | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml b/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml deleted file mode 100644 index d1034fb61d15..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml +++ /dev/null @@ -1,148 +0,0 @@ -<refentry id="vidioc-g-frequency"> - <refmeta> - <refentrytitle>ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_G_FREQUENCY</refname> - <refname>VIDIOC_S_FREQUENCY</refname> - <refpurpose>Get or set tuner or modulator radio -frequency</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_frequency -*<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 struct v4l2_frequency -*<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_FREQUENCY, VIDIOC_S_FREQUENCY</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 tuner or modulator radio frequency -applications set the <structfield>tuner</structfield> field of a -&v4l2-frequency; to the respective tuner or modulator number (only -input devices have tuners, only output devices have modulators), zero -out the <structfield>reserved</structfield> array and -call the <constant>VIDIOC_G_FREQUENCY</constant> ioctl with a pointer -to this structure. The driver stores the current frequency in the -<structfield>frequency</structfield> field.</para> - - <para>To change the current tuner or modulator radio frequency -applications initialize the <structfield>tuner</structfield>, -<structfield>type</structfield> and -<structfield>frequency</structfield> fields, and the -<structfield>reserved</structfield> array of a &v4l2-frequency; and -call the <constant>VIDIOC_S_FREQUENCY</constant> ioctl with a pointer -to this structure. When the requested frequency is not possible the -driver assumes the closest possible value. However -<constant>VIDIOC_S_FREQUENCY</constant> is a write-only ioctl, it does -not return the actual new frequency.</para> - - <table pgwide="1" frame="none" id="v4l2-frequency"> - <title>struct <structname>v4l2_frequency</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>tuner</structfield></entry> - <entry>The tuner or modulator index number. This is the -same value as in the &v4l2-input; <structfield>tuner</structfield> -field and the &v4l2-tuner; <structfield>index</structfield> field, or -the &v4l2-output; <structfield>modulator</structfield> field and the -&v4l2-modulator; <structfield>index</structfield> field.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>type</structfield></entry> - <entry>The tuner type. This is the same value as in the -&v4l2-tuner; <structfield>type</structfield> field. The type must be set -to <constant>V4L2_TUNER_RADIO</constant> for <filename>/dev/radioX</filename> -device nodes, and to <constant>V4L2_TUNER_ANALOG_TV</constant> -for all others. Set this field to <constant>V4L2_TUNER_RADIO</constant> for -modulators (currently only radio modulators are supported). -See <xref linkend="v4l2-tuner-type" /></entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>frequency</structfield></entry> - <entry>Tuning frequency in units of 62.5 kHz, or if the -&v4l2-tuner; or &v4l2-modulator; <structfield>capability</structfield> flag -<constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 -Hz. A 1 Hz unit is used when the <structfield>capability</structfield> flag -<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>reserved</structfield>[8]</entry> - <entry>Reserved for future extensions. Drivers and - applications must set the array to zero.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - - <variablelist> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The <structfield>tuner</structfield> index is out of -bounds or the value in the <structfield>type</structfield> field is -wrong.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EBUSY</errorcode></term> - <listitem> - <para>A hardware seek is in progress.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |