[PATCH v2 4/6] media: Add JPEG_RAW format

[Ezequiel Garcia <ezequiel-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>]

From: Shunqian Zheng <zhengsq-TNX95d0MmH7DzftRWevZcw@public.gmane.org>

Add V4L2_PIX_FMT_JPEG_RAW format that does not contain
JPEG header in the output frame.

Signed-off-by: Shunqian Zheng <zhengsq-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Signed-off-by: Ezequiel Garcia <ezequiel-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
---
 Documentation/media/uapi/v4l/pixfmt-compressed.rst | 9 +++++++++
 drivers/media/v4l2-core/v4l2-ioctl.c               | 1 +
 include/uapi/linux/videodev2.h                     | 1 +
 3 files changed, 11 insertions(+)

diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index d382e7a5c38e..4dffe40097f2 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -23,6 +23,15 @@ Compressed Formats
       - 'JPEG'
       - TBD. See also :ref:`VIDIOC_G_JPEGCOMP <VIDIOC_G_JPEGCOMP>`,
 	:ref:`VIDIOC_S_JPEGCOMP <VIDIOC_G_JPEGCOMP>`.
+    * .. _V4L2-PIX-FMT-JPEG-RAW:
+
+      - ``V4L2_PIX_FMT_JPEG_RAW``
+      - 'Raw JPEG'
+      - Raw JPEG bitstream, containing a compressed payload. This format
+        contains an image scan, i.e. without any metadata or headers.
+        The user is expected to set the needed metadata such as
+        quantization and entropy encoding tables, via ``V4L2_CID_JPEG``
+        controls, see :ref:`jpeg-control-id`.
     * .. _V4L2-PIX-FMT-MPEG:
 
       - ``V4L2_PIX_FMT_MPEG``
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 26d9702069fd..7eac5e39ddac 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1296,6 +1296,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 		/* Max description length mask:	descr = "0123456789012345678901234567890" */
 		case V4L2_PIX_FMT_MJPEG:	descr = "Motion-JPEG"; break;
 		case V4L2_PIX_FMT_JPEG:		descr = "JFIF JPEG"; break;
+		case V4L2_PIX_FMT_JPEG_RAW:	descr = "Raw JPEG"; break;
 		case V4L2_PIX_FMT_DV:		descr = "1394"; break;
 		case V4L2_PIX_FMT_MPEG:		descr = "MPEG-1/2/4"; break;
 		case V4L2_PIX_FMT_H264:		descr = "H.264"; break;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index d8b33095abe0..72b458c8f49f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -621,6 +621,7 @@ struct v4l2_pix_format {
 /* compressed formats */
 #define V4L2_PIX_FMT_MJPEG    v4l2_fourcc('M', 'J', 'P', 'G') /* Motion-JPEG   */
 #define V4L2_PIX_FMT_JPEG     v4l2_fourcc('J', 'P', 'E', 'G') /* JFIF JPEG     */
+#define V4L2_PIX_FMT_JPEG_RAW v4l2_fourcc('J', 'P', 'G', 'R') /* JFIF JPEG RAW without headers */
 #define V4L2_PIX_FMT_DV       v4l2_fourcc('d', 'v', 's', 'd') /* 1394          */
 #define V4L2_PIX_FMT_MPEG     v4l2_fourcc('M', 'P', 'E', 'G') /* MPEG-1/2/4 Multiplexed */
 #define V4L2_PIX_FMT_H264     v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
-- 
2.18.0