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authorSylwester Nawrocki <sylvester.nawrocki@gmail.com>2013-01-19 15:51:55 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-05 15:04:06 -0200
commit2ccbe779bcdee130ea7f1525670dc9d60318a981 (patch)
treef667acca6ab42a0565b062616b3a6f176508e874 /Documentation/DocBook
parentaf9bb33aa33d4beb5d0ac505d48530a56856f66c (diff)
downloadlinux-2ccbe779bcdee130ea7f1525670dc9d60318a981.tar.gz
[media] v4l2-ctrl: Add helper function for the controls range update
This patch adds a helper function that allows to modify range, i.e. minimum, maximum, step and default value of a v4l2 control, after the control has been created and initialized. This is helpful in situations when range of a control depends on user configurable parameters, e.g. camera sensor absolute exposure time depending on an output image resolution and frame rate. v4l2_ctrl_modify_range() function allows to modify range of an INTEGER, BOOL, MENU, INTEGER_MENU and BITMASK type controls. Based on a patch from Hans Verkuil http://patchwork.linuxtv.org/patch/8654. Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/compat.xml4
-rw-r--r--Documentation/DocBook/media/v4l/v4l2.xml4
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-dqevent.xml6
3 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml
index ebd2bfd1ee8..104a1a2b884 100644
--- a/Documentation/DocBook/media/v4l/compat.xml
+++ b/Documentation/DocBook/media/v4l/compat.xml
@@ -2486,6 +2486,10 @@ that used it. It was originally scheduled for removal in 2.6.35.
<structname>v4l2_buffer</structname>. See <xref
linkend="buffer-flags" />.</para>
</listitem>
+ <listitem>
+ <para>Added <constant>V4L2_EVENT_CTRL_CH_RANGE</constant> control event
+ changes flag. See <xref linkend="changes-flags"/>.</para>
+ </listitem>
</orderedlist>
</section>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml
index 8fe29427c8e..c3851a2fb50 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -142,10 +142,12 @@ applications. -->
<revision>
<revnumber>3.9</revnumber>
<date>2012-12-03</date>
- <authorinitials>sa</authorinitials>
+ <authorinitials>sa, sn</authorinitials>
<revremark>Added timestamp types to
<structname>v4l2_buffer</structname>, see <xref
linkend="buffer-flags" />.
+ Added <constant>V4L2_EVENT_CTRL_CH_RANGE</constant> control
+ event changes flag, see <xref linkend="changes-flags"/>.
</revremark>
</revision>
diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
index 98a856f9ec3..89891adb928 100644
--- a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
@@ -261,6 +261,12 @@
<entry>This control event was triggered because the control flags
changed.</entry>
</row>
+ <row>
+ <entry><constant>V4L2_EVENT_CTRL_CH_RANGE</constant></entry>
+ <entry>0x0004</entry>
+ <entry>This control event was triggered because the minimum,
+ maximum, step or the default value of the control changed.</entry>
+ </row>
</tbody>
</tgroup>
</table>