linux/include/media/soc_mediabus.h
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   1/*
   2 * SoC-camera Media Bus API extensions
   3 *
   4 * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#ifndef SOC_MEDIABUS_H
  12#define SOC_MEDIABUS_H
  13
  14#include <linux/videodev2.h>
  15#include <linux/v4l2-mediabus.h>
  16
  17/**
  18 * enum soc_mbus_packing - data packing types on the media-bus
  19 * @SOC_MBUS_PACKING_NONE:      no packing, bit-for-bit transfer to RAM, one
  20 *                              sample represents one pixel
  21 * @SOC_MBUS_PACKING_2X8_PADHI: 16 bits transferred in 2 8-bit samples, in the
  22 *                              possibly incomplete byte high bits are padding
  23 * @SOC_MBUS_PACKING_2X8_PADLO: as above, but low bits are padding
  24 * @SOC_MBUS_PACKING_EXTEND16:  sample width (e.g., 10 bits) has to be extended
  25 *                              to 16 bits
  26 * @SOC_MBUS_PACKING_VARIABLE:  compressed formats with variable packing
  27 * @SOC_MBUS_PACKING_1_5X8:     used for packed YUV 4:2:0 formats, where 4
  28 *                              pixels occupy 6 bytes in RAM
  29 */
  30enum soc_mbus_packing {
  31        SOC_MBUS_PACKING_NONE,
  32        SOC_MBUS_PACKING_2X8_PADHI,
  33        SOC_MBUS_PACKING_2X8_PADLO,
  34        SOC_MBUS_PACKING_EXTEND16,
  35        SOC_MBUS_PACKING_VARIABLE,
  36        SOC_MBUS_PACKING_1_5X8,
  37};
  38
  39/**
  40 * enum soc_mbus_order - sample order on the media bus
  41 * @SOC_MBUS_ORDER_LE:          least significant sample first
  42 * @SOC_MBUS_ORDER_BE:          most significant sample first
  43 */
  44enum soc_mbus_order {
  45        SOC_MBUS_ORDER_LE,
  46        SOC_MBUS_ORDER_BE,
  47};
  48
  49/**
  50 * enum soc_mbus_layout - planes layout in memory
  51 * @SOC_MBUS_LAYOUT_PACKED:             color components packed
  52 * @SOC_MBUS_LAYOUT_PLANAR_2Y_U_V:      YUV components stored in 3 planes (4:2:2)
  53 * @SOC_MBUS_LAYOUT_PLANAR_2Y_C:        YUV components stored in a luma and a
  54 *                                      chroma plane (C plane is half the size
  55 *                                      of Y plane)
  56 * @SOC_MBUS_LAYOUT_PLANAR_Y_C:         YUV components stored in a luma and a
  57 *                                      chroma plane (C plane is the same size
  58 *                                      as Y plane)
  59 */
  60enum soc_mbus_layout {
  61        SOC_MBUS_LAYOUT_PACKED = 0,
  62        SOC_MBUS_LAYOUT_PLANAR_2Y_U_V,
  63        SOC_MBUS_LAYOUT_PLANAR_2Y_C,
  64        SOC_MBUS_LAYOUT_PLANAR_Y_C,
  65};
  66
  67/**
  68 * struct soc_mbus_pixelfmt - Data format on the media bus
  69 * @name:               Name of the format
  70 * @fourcc:             Fourcc code, that will be obtained if the data is
  71 *                      stored in memory in the following way:
  72 * @packing:            Type of sample-packing, that has to be used
  73 * @order:              Sample order when storing in memory
  74 * @bits_per_sample:    How many bits the bridge has to sample
  75 */
  76struct soc_mbus_pixelfmt {
  77        const char              *name;
  78        u32                     fourcc;
  79        enum soc_mbus_packing   packing;
  80        enum soc_mbus_order     order;
  81        enum soc_mbus_layout    layout;
  82        u8                      bits_per_sample;
  83};
  84
  85/**
  86 * struct soc_mbus_lookup - Lookup FOURCC IDs by mediabus codes for pass-through
  87 * @code:       mediabus pixel-code
  88 * @fmt:        pixel format description
  89 */
  90struct soc_mbus_lookup {
  91        enum v4l2_mbus_pixelcode        code;
  92        struct soc_mbus_pixelfmt        fmt;
  93};
  94
  95const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
  96        enum v4l2_mbus_pixelcode code,
  97        const struct soc_mbus_lookup *lookup,
  98        int n);
  99const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
 100        enum v4l2_mbus_pixelcode code);
 101s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);
 102s32 soc_mbus_image_size(const struct soc_mbus_pixelfmt *mf,
 103                        u32 bytes_per_line, u32 height);
 104int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
 105                        unsigned int *numerator, unsigned int *denominator);
 106unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
 107                                        unsigned int flags);
 108
 109#endif
 110
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