include/media/soc_mediabus.h

   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  */
  30 enum 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  */
  44 enum soc_mbus_order {
  45         SOC_MBUS_ORDER_LE,
  46         SOC_MBUS_ORDER_BE,
  47 };
  48
  49 /**
  50  * struct soc_mbus_pixelfmt - Data format on the media bus
  51  * @name:               Name of the format
  52  * @fourcc:             Fourcc code, that will be obtained if the data is
  53  *                      stored in memory in the following way:
  54  * @packing:            Type of sample-packing, that has to be used
  55  * @order:              Sample order when storing in memory
  56  * @bits_per_sample:    How many bits the bridge has to sample
  57  */
  58 struct soc_mbus_pixelfmt {
  59         const char              *name;
  60         u32                     fourcc;
  61         enum soc_mbus_packing   packing;
  62         enum soc_mbus_order     order;
  63         u8                      bits_per_sample;
  64 };
  65
  66 /**
  67  * struct soc_mbus_lookup - Lookup FOURCC IDs by mediabus codes for pass-through
  68  * @code:       mediabus pixel-code
  69  * @fmt:        pixel format description
  70  */
  71 struct soc_mbus_lookup {
  72         enum v4l2_mbus_pixelcode        code;
  73         struct soc_mbus_pixelfmt        fmt;
  74 };
  75
  76 const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
  77         enum v4l2_mbus_pixelcode code,
  78         const struct soc_mbus_lookup *lookup,
  79         int n);
  80 const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
  81         enum v4l2_mbus_pixelcode code);
  82 s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);
  83 int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
  84                         unsigned int *numerator, unsigned int *denominator);
  85
  86 #endif