drivers/media/platform/vimc/vimc-common.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * vimc-common.h Virtual Media Controller Driver
   4  *
   5  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   6  */
   7
   8 #ifndef _VIMC_COMMON_H_
   9 #define _VIMC_COMMON_H_
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13 #include <media/media-device.h>
  14 #include <media/v4l2-device.h>
  15
  16 #define VIMC_PDEV_NAME "vimc"
  17
  18 /* VIMC-specific controls */
  19 #define VIMC_CID_VIMC_BASE              (0x00f00000 | 0xf000)
  20 #define VIMC_CID_VIMC_CLASS             (0x00f00000 | 1)
  21 #define VIMC_CID_TEST_PATTERN           (VIMC_CID_VIMC_BASE + 0)
  22 #define VIMC_CID_MEAN_WIN_SIZE          (VIMC_CID_VIMC_BASE + 1)
  23
  24 #define VIMC_FRAME_MAX_WIDTH 4096
  25 #define VIMC_FRAME_MAX_HEIGHT 2160
  26 #define VIMC_FRAME_MIN_WIDTH 16
  27 #define VIMC_FRAME_MIN_HEIGHT 16
  28
  29 #define VIMC_FRAME_INDEX(lin, col, width, bpp) ((lin * width + col) * bpp)
  30
  31 /* Source and sink pad checks */
  32 #define VIMC_IS_SRC(pad)        (pad)
  33 #define VIMC_IS_SINK(pad)       (!(pad))
  34
  35 /**
  36  * struct vimc_colorimetry_clamp - Adjust colorimetry parameters
  37  *
  38  * @fmt:                the pointer to struct v4l2_pix_format or
  39  *                      struct v4l2_mbus_framefmt
  40  *
  41  * Entities must check if colorimetry given by the userspace is valid, if not
  42  * then set them as DEFAULT
  43  */
  44 #define vimc_colorimetry_clamp(fmt)                                     \
  45 do {                                                                    \
  46         if ((fmt)->colorspace == V4L2_COLORSPACE_DEFAULT                \
  47             || (fmt)->colorspace > V4L2_COLORSPACE_DCI_P3) {            \
  48                 (fmt)->colorspace = V4L2_COLORSPACE_DEFAULT;            \
  49                 (fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;              \
  50                 (fmt)->quantization = V4L2_QUANTIZATION_DEFAULT;        \
  51                 (fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT;              \
  52         }                                                               \
  53         if ((fmt)->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M)                \
  54                 (fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;              \
  55         if ((fmt)->quantization > V4L2_QUANTIZATION_LIM_RANGE)          \
  56                 (fmt)->quantization = V4L2_QUANTIZATION_DEFAULT;        \
  57         if ((fmt)->xfer_func > V4L2_XFER_FUNC_SMPTE2084)                \
  58                 (fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT;              \
  59 } while (0)
  60
  61 /**
  62  * struct vimc_pix_map - maps media bus code with v4l2 pixel format
  63  *
  64  * @code:               media bus format code defined by MEDIA_BUS_FMT_* macros
  65  * @bbp:                number of bytes each pixel occupies
  66  * @pixelformat:        pixel format devined by V4L2_PIX_FMT_* macros
  67  *
  68  * Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
  69  * V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
  70  */
  71 struct vimc_pix_map {
  72         unsigned int code;
  73         unsigned int bpp;
  74         u32 pixelformat;
  75         bool bayer;
  76 };
  77
  78 /**
  79  * struct vimc_ent_device - core struct that represents an entity in the
  80  * topology
  81  *
  82  * @dev:                a pointer of the device struct of the driver
  83  * @ent:                the pointer to struct media_entity for the node
  84  * @process_frame:      callback send a frame to that node
  85  * @vdev_get_format:    callback that returns the current format a pad, used
  86  *                      only when is_media_entity_v4l2_video_device(ent) returns
  87  *                      true
  88  *
  89  * Each node of the topology must create a vimc_ent_device struct. Depending on
  90  * the node it will be of an instance of v4l2_subdev or video_device struct
  91  * where both contains a struct media_entity.
  92  * Those structures should embedded the vimc_ent_device struct through
  93  * v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
  94  * vimc_ent_device struct to be retrieved from the corresponding struct
  95  * media_entity
  96  */
  97 struct vimc_ent_device {
  98         struct device *dev;
  99         struct media_entity *ent;
 100         void * (*process_frame)(struct vimc_ent_device *ved,
 101                                 const void *frame);
 102         void (*vdev_get_format)(struct vimc_ent_device *ved,
 103                               struct v4l2_pix_format *fmt);
 104 };
 105
 106 /**
 107  * struct vimc_device - main device for vimc driver
 108  *
 109  * @pdev        pointer to the platform device
 110  * @pipe_cfg    pointer to the vimc pipeline configuration structure
 111  * @ent_devs    array of vimc_ent_device pointers
 112  * @mdev        the associated media_device parent
 113  * @v4l2_dev    Internal v4l2 parent device
 114  */
 115 struct vimc_device {
 116         struct platform_device pdev;
 117         const struct vimc_pipeline_config *pipe_cfg;
 118         struct vimc_ent_device **ent_devs;
 119         struct media_device mdev;
 120         struct v4l2_device v4l2_dev;
 121 };
 122
 123 /**
 124  * struct vimc_ent_config       Structure which describes individual
 125  *                              configuration for each entity
 126  *
 127  * @name                        entity name
 128  * @ved                         pointer to vimc_ent_device (a node in the
 129  *                                      topology)
 130  * @add                         subdev add hook - initializes and registers
 131  *                                      subdev called from vimc-core
 132  * @rm                          subdev rm hook - unregisters and frees
 133  *                                      subdev called from vimc-core
 134  */
 135 struct vimc_ent_config {
 136         const char *name;
 137         struct vimc_ent_device *(*add)(struct vimc_device *vimc,
 138                                        const char *vcfg_name);
 139         void (*rm)(struct vimc_device *vimc, struct vimc_ent_device *ved);
 140 };
 141
 142 /**
 143  * vimc_is_source - returns true if the entity has only source pads
 144  *
 145  * @ent: pointer to &struct media_entity
 146  *
 147  */
 148 bool vimc_is_source(struct media_entity *ent);
 149
 150 /* prototypes for vimc_ent_config add and rm hooks */
 151 struct vimc_ent_device *vimc_cap_add(struct vimc_device *vimc,
 152                                      const char *vcfg_name);
 153 void vimc_cap_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
 154
 155 struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
 156                                      const char *vcfg_name);
 157 void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
 158
 159 struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
 160                                      const char *vcfg_name);
 161 void vimc_sca_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
 162
 163 struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
 164                                      const char *vcfg_name);
 165 void vimc_sen_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
 166
 167 /**
 168  * vimc_pix_map_by_index - get vimc_pix_map struct by its index
 169  *
 170  * @i:                  index of the vimc_pix_map struct in vimc_pix_map_list
 171  */
 172 const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i);
 173
 174 /**
 175  * vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
 176  *
 177  * @code:               media bus format code defined by MEDIA_BUS_FMT_* macros
 178  */
 179 const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
 180
 181 /**
 182  * vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
 183  *
 184  * @pixelformat:        pixel format devined by V4L2_PIX_FMT_* macros
 185  */
 186 const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
 187
 188 /**
 189  * vimc_ent_sd_register - initialize and register a subdev node
 190  *
 191  * @ved:        the vimc_ent_device struct to be initialize
 192  * @sd:         the v4l2_subdev struct to be initialize and registered
 193  * @v4l2_dev:   the v4l2 device to register the v4l2_subdev
 194  * @name:       name of the sub-device. Please notice that the name must be
 195  *              unique.
 196  * @function:   media entity function defined by MEDIA_ENT_F_* macros
 197  * @num_pads:   number of pads to initialize
 198  * @pads:       the array of pads of the entity, the caller should set the
 199                 flags of the pads
 200  * @sd_int_ops: pointer to &struct v4l2_subdev_internal_ops
 201  * @sd_ops:     pointer to &struct v4l2_subdev_ops.
 202  *
 203  * Helper function initialize and register the struct vimc_ent_device and struct
 204  * v4l2_subdev which represents a subdev node in the topology
 205  */
 206 int vimc_ent_sd_register(struct vimc_ent_device *ved,
 207                          struct v4l2_subdev *sd,
 208                          struct v4l2_device *v4l2_dev,
 209                          const char *const name,
 210                          u32 function,
 211                          u16 num_pads,
 212                          struct media_pad *pads,
 213                          const struct v4l2_subdev_internal_ops *sd_int_ops,
 214                          const struct v4l2_subdev_ops *sd_ops);
 215
 216 /**
 217  * vimc_vdev_link_validate - validates a media link
 218  *
 219  * @link: pointer to &struct media_link
 220  *
 221  * This function calls validates if a media link is valid for streaming.
 222  */
 223 int vimc_vdev_link_validate(struct media_link *link);
 224
 225 #endif