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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml')
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1 files changed, 0 insertions, 188 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml b/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml deleted file mode 100644 index a5fc4c4880f3..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml +++ /dev/null @@ -1,188 +0,0 @@ -<refentry id="vidioc-s-hw-freq-seek"> - <refmeta> - <refentrytitle>ioctl VIDIOC_S_HW_FREQ_SEEK</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_S_HW_FREQ_SEEK</refname> - <refpurpose>Perform a hardware frequency seek</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_hw_freq_seek -*<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_S_HW_FREQ_SEEK</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <para>Start a hardware frequency seek from the current frequency. -To do this applications initialize the <structfield>tuner</structfield>, -<structfield>type</structfield>, <structfield>seek_upward</structfield>, -<structfield>wrap_around</structfield>, <structfield>spacing</structfield>, -<structfield>rangelow</structfield> and <structfield>rangehigh</structfield> -fields, and zero out the <structfield>reserved</structfield> array of a -&v4l2-hw-freq-seek; and call the <constant>VIDIOC_S_HW_FREQ_SEEK</constant> -ioctl with a pointer to this structure.</para> - - <para>The <structfield>rangelow</structfield> and -<structfield>rangehigh</structfield> fields can be set to a non-zero value to -tell the driver to search a specific band. If the &v4l2-tuner; -<structfield>capability</structfield> field has the -<constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant> flag set, these values -must fall within one of the bands returned by &VIDIOC-ENUM-FREQ-BANDS;. If -the <constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant> flag is not set, -then these values must exactly match those of one of the bands returned by -&VIDIOC-ENUM-FREQ-BANDS;. If the current frequency of the tuner does not fall -within the selected band it will be clamped to fit in the band before the -seek is started.</para> - - <para>If an error is returned, then the original frequency will - be restored.</para> - - <para>This ioctl is supported if the <constant>V4L2_CAP_HW_FREQ_SEEK</constant> capability is set.</para> - - <para>If this ioctl is called from a non-blocking filehandle, then &EAGAIN; is - returned and no seek takes place.</para> - - <table pgwide="1" frame="none" id="v4l2-hw-freq-seek"> - <title>struct <structname>v4l2_hw_freq_seek</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>tuner</structfield></entry> - <entry>The tuner index number. This is the -same value as in the &v4l2-input; <structfield>tuner</structfield> -field and the &v4l2-tuner; <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. See <xref - linkend="v4l2-tuner-type" /></entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>seek_upward</structfield></entry> - <entry>If non-zero, seek upward from the current frequency, else seek downward.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>wrap_around</structfield></entry> - <entry>If non-zero, wrap around when at the end of the frequency range, else stop seeking. - The &v4l2-tuner; <structfield>capability</structfield> field will tell you what the - hardware supports. - </entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>spacing</structfield></entry> - <entry>If non-zero, defines the hardware seek resolution in Hz. The driver selects the nearest value that is supported by the device. If spacing is zero a reasonable default value is used.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>rangelow</structfield></entry> - <entry>If non-zero, the lowest tunable frequency of the band to -search in units of 62.5 kHz, or if the &v4l2-tuner; -<structfield>capability</structfield> field has the -<constant>V4L2_TUNER_CAP_LOW</constant> flag set, in units of 62.5 Hz or if the &v4l2-tuner; -<structfield>capability</structfield> field has the -<constant>V4L2_TUNER_CAP_1HZ</constant> flag set, in units of 1 Hz. -If <structfield>rangelow</structfield> is zero a reasonable default value -is used.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>rangehigh</structfield></entry> - <entry>If non-zero, the highest tunable frequency of the band to -search in units of 62.5 kHz, or if the &v4l2-tuner; -<structfield>capability</structfield> field has the -<constant>V4L2_TUNER_CAP_LOW</constant> flag set, in units of 62.5 Hz or if the &v4l2-tuner; -<structfield>capability</structfield> field has the -<constant>V4L2_TUNER_CAP_1HZ</constant> flag set, in units of 1 Hz. -If <structfield>rangehigh</structfield> is zero a reasonable default value -is used.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>reserved</structfield>[5]</entry> - <entry>Reserved for future extensions. 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, the <structfield>wrap_around</structfield> value is not supported or -one of the values in the <structfield>type</structfield>, -<structfield>rangelow</structfield> or <structfield>rangehigh</structfield> -fields is wrong.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EAGAIN</errorcode></term> - <listitem> - <para>Attempted to call <constant>VIDIOC_S_HW_FREQ_SEEK</constant> - with the filehandle in non-blocking mode.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>ENODATA</errorcode></term> - <listitem> - <para>The hardware seek found no channels.</para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EBUSY</errorcode></term> - <listitem> - <para>Another hardware seek is already in progress.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |