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authorGravatar Mauro Carvalho Chehab <mchehab@s-opensource.com> 2016-07-27 06:32:31 -0300
committerGravatar Mauro Carvalho Chehab <mchehab@s-opensource.com> 2016-07-28 20:08:19 -0300
commit43f71d93a0cb342f0c918fba3f6abb7661e40ad2 (patch)
treea1dc7288bc480e7027ca1827ca4876472fa12e40 /Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml
parentMerge tag 'media/v4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mch... (diff)
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doc-rst: Remove the media docbook
Now that all media documentation was converted to Sphinx, we should get rid of the old DocBook one, as we don't want people to submit patches against the old stuff. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml')
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diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml b/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml
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--- a/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml
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-<refentry id="vidioc-enum-freq-bands">
- <refmeta>
- <refentrytitle>ioctl VIDIOC_ENUM_FREQ_BANDS</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>VIDIOC_ENUM_FREQ_BANDS</refname>
- <refpurpose>Enumerate supported frequency bands</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_band
-*<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_ENUM_FREQ_BANDS</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>argp</parameter></term>
- <listitem>
- <para></para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
- <para>Enumerates the frequency bands that a tuner or modulator supports.
-To do this applications initialize the <structfield>tuner</structfield>,
-<structfield>type</structfield> and <structfield>index</structfield> fields,
-and zero out the <structfield>reserved</structfield> array of a &v4l2-frequency-band; and
-call the <constant>VIDIOC_ENUM_FREQ_BANDS</constant> ioctl with a pointer
-to this structure.</para>
-
- <para>This ioctl is supported if the <constant>V4L2_TUNER_CAP_FREQ_BANDS</constant> capability
- of the corresponding tuner/modulator is set.</para>
-
- <table pgwide="1" frame="none" id="v4l2-frequency-band">
- <title>struct <structname>v4l2_frequency_band</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>index</structfield></entry>
- <entry>Identifies the frequency band, set by the application.</entry>
- </row>
- <row>
- <entry>__u32</entry>
- <entry><structfield>capability</structfield></entry>
- <entry spanname="hspan">The tuner/modulator capability flags for
-this frequency band, see <xref linkend="tuner-capability" />. The <constant>V4L2_TUNER_CAP_LOW</constant>
-or <constant>V4L2_TUNER_CAP_1HZ</constant> capability must be the same for all frequency bands of the selected tuner/modulator.
-So either all bands have that capability set, or none of them have that capability.</entry>
- </row>
- <row>
- <entry>__u32</entry>
- <entry><structfield>rangelow</structfield></entry>
- <entry spanname="hspan">The lowest tunable frequency in
-units of 62.5 kHz, or if the <structfield>capability</structfield>
-flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
-Hz, for this frequency band. 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>rangehigh</structfield></entry>
- <entry spanname="hspan">The highest tunable frequency in
-units of 62.5 kHz, or if the <structfield>capability</structfield>
-flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
-Hz, for this frequency band. 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>modulation</structfield></entry>
- <entry spanname="hspan">The supported modulation systems of this frequency band.
- See <xref linkend="band-modulation" />. Note that currently only one
- modulation system per frequency band is supported. More work will need to
- be done if multiple modulation systems are possible. Contact the
- linux-media mailing list (&v4l-ml;) if you need that functionality.</entry>
- </row>
- <row>
- <entry>__u32</entry>
- <entry><structfield>reserved</structfield>[9]</entry>
- <entry>Reserved for future extensions. Applications and drivers
- must set the array to zero.</entry>
- </row>
- </tbody>
- </tgroup>
- </table>
-
- <table pgwide="1" frame="none" id="band-modulation">
- <title>Band Modulation Systems</title>
- <tgroup cols="3">
- &cs-def;
- <tbody valign="top">
- <row>
- <entry><constant>V4L2_BAND_MODULATION_VSB</constant></entry>
- <entry>0x02</entry>
- <entry>Vestigial Sideband modulation, used for analog TV.</entry>
- </row>
- <row>
- <entry><constant>V4L2_BAND_MODULATION_FM</constant></entry>
- <entry>0x04</entry>
- <entry>Frequency Modulation, commonly used for analog radio.</entry>
- </row>
- <row>
- <entry><constant>V4L2_BAND_MODULATION_AM</constant></entry>
- <entry>0x08</entry>
- <entry>Amplitude Modulation, commonly used for analog radio.</entry>
- </row>
- </tbody>
- </tgroup>
- </table>
- </refsect1>
-
- <refsect1>
- &return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The <structfield>tuner</structfield> or <structfield>index</structfield>
-is out of bounds or the <structfield>type</structfield> field is wrong.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-</refentry>