[PATCH 1/2] v4l: Add 12-bit raw bayer linear packed formats

[Edgar Thier <info@edgarthier.net>]

These formats are compressed 12-bit raw bayer formats with four different
pixel orders. The pixel follow one another without any padding,
thus are packed in a 'linear' fashion.

Signed-off-by: Edgar Thier <info@edgarthier.net>
---
 Documentation/media/uapi/v4l/pixfmt-rgb.rst   |  1 +
 .../media/uapi/v4l/pixfmt-srggb12lp.rst       | 60 +++++++++++++++++++
 drivers/media/v4l2-core/v4l2-ioctl.c          |  4 ++
 include/uapi/linux/videodev2.h                |  7 +++
 4 files changed, 72 insertions(+)
 create mode 100644 Documentation/media/uapi/v4l/pixfmt-srggb12lp.rst

diff --git a/Documentation/media/uapi/v4l/pixfmt-rgb.rst b/Documentation/media/uapi/v4l/pixfmt-rgb.rst
index 48ab80024835..9efa500c02dc 100644
--- a/Documentation/media/uapi/v4l/pixfmt-rgb.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-rgb.rst
@@ -26,5 +26,6 @@ RGB Formats
     pixfmt-srggb10-ipu3
     pixfmt-srggb12
     pixfmt-srggb12p
+    pixfmt-srggb12lp
     pixfmt-srggb14p
     pixfmt-srggb16
diff --git a/Documentation/media/uapi/v4l/pixfmt-srggb12lp.rst b/Documentation/media/uapi/v4l/pixfmt-srggb12lp.rst
new file mode 100644
index 000000000000..13d32ad92c73
--- /dev/null
+++ b/Documentation/media/uapi/v4l/pixfmt-srggb12lp.rst
@@ -0,0 +1,60 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _v4l2-pix-fmt-sgrbg12lp:
+.. _v4l2-pix-fmt-srggb12lp:
+.. _v4l2-pix-fmt-sbggr12lp:
+.. _v4l2-pix-fmt-sgbrg12lp:
+
+**********************************************************************************************************************************
+V4L2_PIX_FMT_SBGGR12LP ('BGCp'), V4L2_PIX_FMT_SGBRG12LP ('GBCp'), V4L2_PIX_FMT_SGRBG12LP ('GRCp'), V4L2_PIX_FMT_SRGGB12LP ('RGCp')
+**********************************************************************************************************************************
+
+12-bit Bayer formats
+
+Description
+===========
+
+These four pixel formats are used by industrial cameras, often in conjunction
+with UsbVision (see https://www.visiononline.org/userAssets/aiaUploads/file/USB3_Vision_Specification_v1-0-1.pdf).
+
+The formats are equal to the Genicam PFNC Bayer12p formats
+(see https://www.emva.org/wp-content/uploads/GenICam_PFNC_2_3.pdf).
+
+They are raw sRGB / Bayer formats with 12 bits
+per sample with 3 bytes for every 2 pixels.
+
+The format is little endian.
+
+Below is an example of a small image in V4L2_PIX_FMT_PFNC_BAYERBG12P format.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. tabularcolumns:: |p{0.8cm}|p{4.0cm}|p{4.0cm}|p{4.0cm}|p{4.0cm}|
+
+.. flat-table::
+
+    * - start + 0:
+      - B\ :sub:`00low`
+      - G\ :sub:`01low`\ (bits 7--4)
+        B\ :sub:`00high`\ (bits 0--3)
+      - G\ :sub:`01high`\
+
+    * - start + 6:
+      - G\ :sub:`02low`
+      - R\ :sub:`03low`\ (bits 7--4)
+        G\ :sub:`02high`\ (bits 0--3)
+      - R\ :sub:`03high`
+
+    * - start + 12:
+      - B\ :sub:`04low`
+      - G\ :sub:`05low`\ (bits 7--4)
+        B\ :sub:`04high`\ (bits 0--3)
+      - G\ :sub:`05high`
+
+    * - start + 24:
+      - G\ :sub:`06low`
+      - R\ :sub:`07low`\ (bits 7--4)
+        G\ :sub:`06high`\ (bits 0--3)
+      - R\ :sub:`07high`
+
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index ac87c3e37280..98c3c7fde046 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1275,6 +1275,10 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 	case V4L2_PIX_FMT_SGBRG12:	descr = "12-bit Bayer GBGB/RGRG"; break;
 	case V4L2_PIX_FMT_SGRBG12:	descr = "12-bit Bayer GRGR/BGBG"; break;
 	case V4L2_PIX_FMT_SRGGB12:	descr = "12-bit Bayer RGRG/GBGB"; break;
+	case V4L2_PIX_FMT_SGBRG12LP:	descr = "12-bit Bayer GBGB/RGRG Linear Packed"; break;
+	case V4L2_PIX_FMT_SGRBG12LP:	descr = "12-bit Bayer GRGR/BGBG Linear Packed"; break;
+	case V4L2_PIX_FMT_SBGGR12LP:	descr = "12-bit Bayer BGBG/GRGR Linear Packed"; break;
+	case V4L2_PIX_FMT_SRGGB12LP:	descr = "12-bit Bayer RGRG/GBGB Linear Packed"; break;
 	case V4L2_PIX_FMT_SBGGR12P:	descr = "12-bit Bayer BGBG/GRGR Packed"; break;
 	case V4L2_PIX_FMT_SGBRG12P:	descr = "12-bit Bayer GBGB/RGRG Packed"; break;
 	case V4L2_PIX_FMT_SGRBG12P:	descr = "12-bit Bayer GRGR/BGBG Packed"; break;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1050a75fb7ef..f0b81b870f29 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -646,6 +646,13 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_SGBRG12 v4l2_fourcc('G', 'B', '1', '2') /* 12  GBGB.. RGRG.. */
 #define V4L2_PIX_FMT_SGRBG12 v4l2_fourcc('B', 'A', '1', '2') /* 12  GRGR.. BGBG.. */
 #define V4L2_PIX_FMT_SRGGB12 v4l2_fourcc('R', 'G', '1', '2') /* 12  RGRG.. GBGB.. */
+
+	/* 12bit raw bayer simple packed, 6 bytes for every 4 pixels */
+#define V4L2_PIX_FMT_SBGGR12LP v4l2_fourcc('B', 'G', 'C', 'p')
+#define V4L2_PIX_FMT_SGBRG12LP v4l2_fourcc('G', 'B', 'C', 'p')
+#define V4L2_PIX_FMT_SGRBG12LP v4l2_fourcc('G', 'R', 'C', 'p')
+#define V4L2_PIX_FMT_SRGGB12LP v4l2_fourcc('R', 'G', 'C', 'p')
+
 	/* 12bit raw bayer packed, 6 bytes for every 4 pixels */
 #define V4L2_PIX_FMT_SBGGR12P v4l2_fourcc('p', 'B', 'C', 'C')
 #define V4L2_PIX_FMT_SGBRG12P v4l2_fourcc('p', 'G', 'C', 'C')
-- 
2.20.1