V4L/DVB (13658): v4l: add a media-bus API for configuring v4l2 subdev pixel and frame formats

Video subdevices, like cameras, decoders, connect to video bridges over
specialised busses. Data is being transferred over these busses in various
formats, which only loosely correspond to fourcc codes, describing how video
data is stored in RAM. This is not a one-to-one correspondence, therefore we
cannot use fourcc codes to configure subdevice output data formats. This patch
adds codes for several such on-the-bus formats and an API, similar to the
familiar .s_fmt(), .g_fmt(), .try_fmt(), .enum_fmt() API for configuring those
codes. After all users of the old API in struct v4l2_subdev_video_ops are
converted, it will be removed. Also add helper routines to support generic
pass-through mode for the soc-camera framework.

 create mode 100644 drivers/media/video/soc_mediabus.c
 create mode 100644 include/media/soc_mediabus.h
 create mode 100644 include/media/v4l2-mediabus.h

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 143 insertions, 1 deletions

diff --git a/include/media/soc_mediabus.h b/include/media/soc_mediabus.h
new file mode 100644
index 000000000000..037cd7be001e
--- /dev/null
+++ b/include/media/soc_mediabus.h
@@ -0,0 +1,65 @@
+/*
+ * SoC-camera Media Bus API extensions
+ *
+ * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef SOC_MEDIABUS_H
+#define SOC_MEDIABUS_H
+
+#include <linux/videodev2.h>
+
+#include <media/v4l2-mediabus.h>
+
+/**
+ * enum soc_mbus_packing - data packing types on the media-bus
+ * @SOC_MBUS_PACKING_NONE:      no packing, bit-for-bit transfer to RAM
+ * @SOC_MBUS_PACKING_2X8_PADHI: 16 bits transferred in 2 8-bit samples, in the
+ *                              possibly incomplete byte high bits are padding
+ * @SOC_MBUS_PACKING_2X8_PADLO: as above, but low bits are padding
+ * @SOC_MBUS_PACKING_EXTEND16:  sample width (e.g., 10 bits) has to be extended
+ *                              to 16 bits
+ */
+enum soc_mbus_packing {
+        SOC_MBUS_PACKING_NONE,
+        SOC_MBUS_PACKING_2X8_PADHI,
+        SOC_MBUS_PACKING_2X8_PADLO,
+        SOC_MBUS_PACKING_EXTEND16,
+};
+
+/**
+ * enum soc_mbus_order - sample order on the media bus
+ * @SOC_MBUS_ORDER_LE:          least significant sample first
+ * @SOC_MBUS_ORDER_BE:          most significant sample first
+ */
+enum soc_mbus_order {
+        SOC_MBUS_ORDER_LE,
+        SOC_MBUS_ORDER_BE,
+};
+
+/**
+ * struct soc_mbus_pixelfmt - Data format on the media bus
+ * @name:               Name of the format
+ * @fourcc:             Fourcc code, that will be obtained if the data is
+ *                      stored in memory in the following way:
+ * @packing:            Type of sample-packing, that has to be used
+ * @order:              Sample order when storing in memory
+ * @bits_per_sample:    How many bits the bridge has to sample
+ */
+struct soc_mbus_pixelfmt {
+        const char              *name;
+        u32                     fourcc;
+        enum soc_mbus_packing   packing;
+        enum soc_mbus_order     order;
+        u8                      bits_per_sample;
+};
+
+const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
+        enum v4l2_mbus_pixelcode code);
+s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);
+
+#endif
diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
new file mode 100644
index 000000000000..0dbe02ada259
--- /dev/null
+++ b/include/media/v4l2-mediabus.h
@@ -0,0 +1,61 @@
+/*
+ * Media Bus API header
+ *
+ * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef V4L2_MEDIABUS_H
+#define V4L2_MEDIABUS_H
+
+/*
+ * These pixel codes uniquely identify data formats on the media bus. Mostly
+ * they correspond to similarly named V4L2_PIX_FMT_* formats, format 0 is
+ * reserved, V4L2_MBUS_FMT_FIXED shall be used by host-client pairs, where the
+ * data format is fixed. Additionally, "2X8" means that one pixel is transferred
+ * in two 8-bit samples, "BE" or "LE" specify in which order those samples are
+ * transferred over the bus: "LE" means that the least significant bits are
+ * transferred first, "BE" means that the most significant bits are transferred
+ * first, and "PADHI" and "PADLO" define which bits - low or high, in the
+ * incomplete high byte, are filled with padding bits.
+ */
+enum v4l2_mbus_pixelcode {
+        V4L2_MBUS_FMT_FIXED = 1,
+        V4L2_MBUS_FMT_YUYV8_2X8_LE,
+        V4L2_MBUS_FMT_YVYU8_2X8_LE,
+        V4L2_MBUS_FMT_YUYV8_2X8_BE,
+        V4L2_MBUS_FMT_YVYU8_2X8_BE,
+        V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
+        V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
+        V4L2_MBUS_FMT_RGB565_2X8_LE,
+        V4L2_MBUS_FMT_RGB565_2X8_BE,
+        V4L2_MBUS_FMT_SBGGR8_1X8,
+        V4L2_MBUS_FMT_SBGGR10_1X10,
+        V4L2_MBUS_FMT_GREY8_1X8,
+        V4L2_MBUS_FMT_Y10_1X10,
+        V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE,
+        V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE,
+        V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE,
+        V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE,
+};
+
+/**
+ * struct v4l2_mbus_framefmt - frame format on the media bus
+ * @width:      frame width
+ * @height:     frame height
+ * @code:       data format code
+ * @field:      used interlacing type
+ * @colorspace: colorspace of the data
+ */
+struct v4l2_mbus_framefmt {
+        __u32                           width;
+        __u32                           height;
+        enum v4l2_mbus_pixelcode        code;
+        enum v4l2_field                 field;
+        enum v4l2_colorspace            colorspace;
+};
+
+#endif
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index a128458dc9eb..9ba99cd39ee7 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -22,6 +22,7 @@
 #define _V4L2_SUBDEV_H
 
 #include <media/v4l2-common.h>
+#include <media/v4l2-mediabus.h>
 
 /* generic v4l2_device notify callback notification values */
 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
@@ -207,7 +208,7 @@ struct v4l2_subdev_audio_ops {
    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
         video input devices.
 
-  s_crystal_freq: sets the frequency of the crystal used to generate the
+   s_crystal_freq: sets the frequency of the crystal used to generate the
         clocks in Hz. An extra flags field allows device specific configuration
         regarding clock frequency dividers, etc. If not used, then set flags
         to 0. If the frequency is not supported, then -EINVAL is returned.
@@ -230,6 +231,13 @@ struct v4l2_subdev_audio_ops {
 
    g_dv_timings(): Get custom dv timings in the sub device.
 
+   enum_mbus_fmt: enumerate pixel formats, provided by a video data source
+
+   g_mbus_fmt: get the current pixel format, provided by a video data source
+
+   try_mbus_fmt: try to set a pixel format on a video data source
+
+   s_mbus_fmt: set a pixel format on a video data source
  */
 struct v4l2_subdev_video_ops {
         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
@@ -261,6 +269,14 @@ struct v4l2_subdev_video_ops {
                         struct v4l2_dv_timings *timings);
         int (*g_dv_timings)(struct v4l2_subdev *sd,
                         struct v4l2_dv_timings *timings);
+        int (*enum_mbus_fmt)(struct v4l2_subdev *sd, int index,
+                             enum v4l2_mbus_pixelcode *code);
+        int (*g_mbus_fmt)(struct v4l2_subdev *sd,
+                          struct v4l2_mbus_framefmt *fmt);
+        int (*try_mbus_fmt)(struct v4l2_subdev *sd,
+                            struct v4l2_mbus_framefmt *fmt);
+        int (*s_mbus_fmt)(struct v4l2_subdev *sd,
+                          struct v4l2_mbus_framefmt *fmt);
 };
 
 /**