[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>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml
index 8fe2942..c3851a2 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -142,10 +142,12 @@
<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>