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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-27 06:32:31 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-28 20:08:19 -0300
commit43f71d93a0cb342f0c918fba3f6abb7661e40ad2 (patch)
treea1dc7288bc480e7027ca1827ca4876472fa12e40 /Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml
parentMerge tag 'media/v4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media (diff)
downloadlinux-dev-43f71d93a0cb342f0c918fba3f6abb7661e40ad2.tar.xz
linux-dev-43f71d93a0cb342f0c918fba3f6abb7661e40ad2.zip
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>
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diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml
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-<refentry id="vidioc-subdev-g-frame-interval">
- <refmeta>
- <refentrytitle>ioctl VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>VIDIOC_SUBDEV_G_FRAME_INTERVAL</refname>
- <refname>VIDIOC_SUBDEV_S_FRAME_INTERVAL</refname>
- <refpurpose>Get or set the frame interval on a subdev pad</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_subdev_frame_interval *<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_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>argp</parameter></term>
- <listitem>
- <para></para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
- <para>These ioctls are used to get and set the frame interval at specific
- subdev pads in the image pipeline. The frame interval only makes sense for
- sub-devices that can control the frame period on their own. This includes,
- for instance, image sensors and TV tuners. Sub-devices that don't support
- frame intervals must not implement these ioctls.</para>
-
- <para>To retrieve the current frame interval applications set the
- <structfield>pad</structfield> field of a &v4l2-subdev-frame-interval; to
- the desired pad number as reported by the media controller API. When they
- call the <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> ioctl with a
- pointer to this structure the driver fills the members of the
- <structfield>interval</structfield> field.</para>
-
- <para>To change the current frame interval applications set both the
- <structfield>pad</structfield> field and all members of the
- <structfield>interval</structfield> field. When they call the
- <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant> ioctl with a pointer to
- this structure the driver verifies the requested interval, adjusts it based
- on the hardware capabilities and configures the device. Upon return the
- &v4l2-subdev-frame-interval; contains the current frame interval as would be
- returned by a <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> call.
- </para>
-
- <para>Drivers must not return an error solely because the requested interval
- doesn't match the device capabilities. They must instead modify the interval
- to match what the hardware can provide. The modified interval should be as
- close as possible to the original request.</para>
-
- <para>Sub-devices that support the frame interval ioctls should implement
- them on a single pad only. Their behaviour when supported on multiple pads
- of the same sub-device is not defined.</para>
-
- <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval">
- <title>struct <structname>v4l2_subdev_frame_interval</structname></title>
- <tgroup cols="3">
- &cs-str;
- <tbody valign="top">
- <row>
- <entry>__u32</entry>
- <entry><structfield>pad</structfield></entry>
- <entry>Pad number as reported by the media controller API.</entry>
- </row>
- <row>
- <entry>&v4l2-fract;</entry>
- <entry><structfield>interval</structfield></entry>
- <entry>Period, in seconds, between consecutive video frames.</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>
- </refsect1>
-
- <refsect1>
- &return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The frame interval can't be changed because the pad is currently
- busy. This can be caused, for instance, by an active video stream on
- the pad. The ioctl must not be retried without performing another
- action to fix the problem first. Only returned by
- <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant></para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The &v4l2-subdev-frame-interval; <structfield>pad</structfield>
- references a non-existing pad, or the pad doesn't support frame
- intervals.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-</refentry>