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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2014-01-29 10:07:13 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-05-25 12:47:55 -0300
commit9cfd65e80959836fed78704e8a127d4e10448d56 (patch)
treebdae4d269740557a868dd2a7c2a89394c8af69f8 /Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
parent[media] v4l: Improve readability by not wrapping ioctl number #define's (diff)
downloadlinux-dev-9cfd65e80959836fed78704e8a127d4e10448d56.tar.xz
linux-dev-9cfd65e80959836fed78704e8a127d4e10448d56.zip
[media] v4l: Add support for DV timings ioctls on subdev nodes
Validate the pad field in the core code whenever specified. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml27
1 files changed, 22 insertions, 5 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
index cd7720d404ea..28a8c1e1c705 100644
--- a/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml
@@ -1,11 +1,12 @@
<refentry id="vidioc-dv-timings-cap">
<refmeta>
- <refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP</refentrytitle>
+ <refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>VIDIOC_DV_TIMINGS_CAP</refname>
+ <refname>VIDIOC_SUBDEV_DV_TIMINGS_CAP</refname>
<refpurpose>The capabilities of the Digital Video receiver/transmitter</refpurpose>
</refnamediv>
@@ -33,7 +34,7 @@
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
- <para>VIDIOC_DV_TIMINGS_CAP</para>
+ <para>VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</para>
</listitem>
</varlistentry>
<varlistentry>
@@ -54,10 +55,19 @@
interface and may change in the future.</para>
</note>
- <para>To query the capabilities of the DV receiver/transmitter applications can call
-this ioctl and the driver will fill in the structure. Note that drivers may return
+ <para>To query the capabilities of the DV receiver/transmitter applications
+can call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node
+and the driver will fill in the structure. Note that drivers may return
different values after switching the video input or output.</para>
+ <para>When implemented by the driver DV capabilities of subdevices can be
+queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl
+directly on a subdevice node. The capabilities are specific to inputs (for DV
+receivers) or outputs (for DV transmitters), applications must specify the
+desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield>
+field. Attempts to query capabilities on a pad that doesn't support them will
+return an &EINVAL;.</para>
+
<table pgwide="1" frame="none" id="v4l2-bt-timings-cap">
<title>struct <structname>v4l2_bt_timings_cap</structname></title>
<tgroup cols="3">
@@ -127,7 +137,14 @@ different values after switching the video input or output.</para>
</row>
<row>
<entry>__u32</entry>
- <entry><structfield>reserved</structfield>[3]</entry>
+ <entry><structfield>pad</structfield></entry>
+ <entry>Pad number as reported by the media controller API. This field
+ is only used when operating on a subdevice node. When operating on a
+ video node applications must set this field to zero.</entry>
+ </row>
+ <row>
+ <entry>__u32</entry>
+ <entry><structfield>reserved</structfield>[2]</entry>
<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
</row>
<row>