The V4L2_CID_FRAMESIZE control determines maximum number
of media bus samples transmitted within a single data frame.
It is useful for determining size of data buffer at the
receiver side.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
Documentation/DocBook/media/v4l/controls.xml | 12 ++++++++++++
drivers/media/v4l2-core/v4l2-ctrls.c | 2 ++
include/linux/videodev2.h | 1 +
3 files changed, 15 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 93b9c68..ad5d4e5 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -4184,6 +4184,18 @@ interface and may change in the future.</para>
conversion.
</entry>
</row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FRAMESIZE</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Maximum size of a data frame in media bus
+ sample units. This control determines maximum number of samples
+ transmitted per single compressed data frame. For generic raw
+ pixel formats the value of this control is undefined. This is
+ a read-only control.
+ </entry>
+ </row>
<row><entry></entry></row>
</tbody>
</tgroup>
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index b6a2ee7..0043fd2 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -727,6 +727,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_VBLANK: return "Vertical Blanking";
case V4L2_CID_HBLANK: return "Horizontal Blanking";
case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
+ case V4L2_CID_FRAMESIZE: return "Maximum Frame Size";
/* Image processing controls */
case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
@@ -933,6 +934,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_FLASH_STROBE_STATUS:
case V4L2_CID_AUTO_FOCUS_STATUS:
case V4L2_CID_FLASH_READY:
+ case V4L2_CID_FRAMESIZE:
*flags |= V4L2_CTRL_FLAG_READ_ONLY;
break;
}
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 7a147c8..d3fd19f 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1985,6 +1985,7 @@ enum v4l2_jpeg_chroma_subsampling {
#define V4L2_CID_VBLANK (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 1)
#define V4L2_CID_HBLANK (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 2)
#define V4L2_CID_ANALOGUE_GAIN (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 3)
+#define V4L2_CID_FRAMESIZE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 4)
/* Image processing controls */
#define V4L2_CID_IMAGE_PROC_CLASS_BASE (V4L2_CTRL_CLASS_IMAGE_PROC | 0x900)
--
1.7.11.3
--
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