VIDIOC_S_CTRL and VIDIOC_S_EXT_CTRLS return EACCES when setting a read-only
control VIDIOC_TRY_EXT_CTRLS when trying a read-only control and
VIDIOC_G_CTRL and VIDIOC_G_EXT_CTRLS when getting a write-only control.
Document this.

Signed-off-by: Sakari Ailus <sakari.ai...@maxwell.research.nokia.com>
---
 Documentation/DocBook/v4l/vidioc-g-ctrl.xml      |    7 +++++++
 Documentation/DocBook/v4l/vidioc-g-ext-ctrls.xml |    7 +++++++
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/Documentation/DocBook/v4l/vidioc-g-ctrl.xml 
b/Documentation/DocBook/v4l/vidioc-g-ctrl.xml
index 8b5e6ff..5146d00 100644
--- a/Documentation/DocBook/v4l/vidioc-g-ctrl.xml
+++ b/Documentation/DocBook/v4l/vidioc-g-ctrl.xml
@@ -117,6 +117,13 @@ because another applications took over control of the 
device function
 this control belongs to.</para>
        </listitem>
       </varlistentry>
+      <varlistentry>
+       <term><errorcode>EACCES</errorcode></term>
+       <listitem>
+         <para>Attempt to set a read-only control or to get a
+         write-only control.</para>
+       </listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>
 </refentry>
diff --git a/Documentation/DocBook/v4l/vidioc-g-ext-ctrls.xml 
b/Documentation/DocBook/v4l/vidioc-g-ext-ctrls.xml
index 3aa7f8f..5e73517 100644
--- a/Documentation/DocBook/v4l/vidioc-g-ext-ctrls.xml
+++ b/Documentation/DocBook/v4l/vidioc-g-ext-ctrls.xml
@@ -294,6 +294,13 @@ The field <structfield>size</structfield> is set to a 
value that is enough
 to store the payload and this error code is returned.</para>
        </listitem>
       </varlistentry>
+      <varlistentry>
+       <term><errorcode>EACCES</errorcode></term>
+       <listitem>
+         <para>Attempt to try or set a read-only control or to get a
+         write-only control.</para>
+       </listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>
 </refentry>
-- 
1.7.2.5

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