path: root/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-create-bufs.xml')
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
index a2474ecb574..a8cda1acacd 100644
--- a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
@@ -64,7 +64,7 @@ different sizes.</para>
<para>To allocate device buffers applications initialize relevant fields of
the <structname>v4l2_create_buffers</structname> structure. They set the
<structfield>type</structfield> field in the
-<structname>v4l2_format</structname> structure, embedded in this
+&v4l2-format; structure, embedded in this
structure, to the respective stream or buffer type.
<structfield>count</structfield> must be set to the number of required buffers.
<structfield>memory</structfield> specifies the required I/O method. The
@@ -97,7 +97,13 @@ information.</para>
- <entry>The number of buffers requested or granted.</entry>
+ <entry>The number of buffers requested or granted. If count == 0, then
+ <constant>VIDIOC_CREATE_BUFS</constant> will set <structfield>index</structfield>
+ to the current number of created buffers, and it will check the validity of
+ <structfield>memory</structfield> and <structfield>format.type</structfield>.
+ If those are invalid -1 is returned and errno is set to &EINVAL;,
+ otherwise <constant>VIDIOC_CREATE_BUFS</constant> returns 0. It will
+ never set errno to &EBUSY; in this particular case.</entry>
@@ -108,7 +114,7 @@ information.</para>
- <entry>struct&nbsp;v4l2_format</entry>
+ <entry>&v4l2-format;</entry>
<entry>Filled in by the application, preserved by the driver.</entry>