drivers/media/platform/vsp1/vsp1_rwpf.c

   1 /*
   2  * vsp1_rwpf.c  --  R-Car VSP1 Read and Write Pixel Formatters
   3  *
   4  * Copyright (C) 2013 Renesas Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <media/v4l2-subdev.h>
  15
  16 #include "vsp1.h"
  17 #include "vsp1_rwpf.h"
  18 #include "vsp1_video.h"
  19
  20 #define RWPF_MIN_WIDTH                          1
  21 #define RWPF_MIN_HEIGHT                         1
  22
  23 /* -----------------------------------------------------------------------------
  24  * V4L2 Subdevice Pad Operations
  25  */
  26
  27 int vsp1_rwpf_enum_mbus_code(struct v4l2_subdev *subdev,
  28                              struct v4l2_subdev_fh *fh,
  29                              struct v4l2_subdev_mbus_code_enum *code)
  30 {
  31         static const unsigned int codes[] = {
  32                 V4L2_MBUS_FMT_ARGB8888_1X32,
  33                 V4L2_MBUS_FMT_AYUV8_1X32,
  34         };
  35
  36         if (code->index >= ARRAY_SIZE(codes))
  37                 return -EINVAL;
  38
  39         code->code = codes[code->index];
  40
  41         return 0;
  42 }
  43
  44 int vsp1_rwpf_enum_frame_size(struct v4l2_subdev *subdev,
  45                               struct v4l2_subdev_fh *fh,
  46                               struct v4l2_subdev_frame_size_enum *fse)
  47 {
  48         struct vsp1_rwpf *rwpf = to_rwpf(subdev);
  49         struct v4l2_mbus_framefmt *format;
  50
  51         format = v4l2_subdev_get_try_format(fh, fse->pad);
  52
  53         if (fse->index || fse->code != format->code)
  54                 return -EINVAL;
  55
  56         if (fse->pad == RWPF_PAD_SINK) {
  57                 fse->min_width = RWPF_MIN_WIDTH;
  58                 fse->max_width = rwpf->max_width;
  59                 fse->min_height = RWPF_MIN_HEIGHT;
  60                 fse->max_height = rwpf->max_height;
  61         } else {
  62                 /* The size on the source pad are fixed and always identical to
  63                  * the size on the sink pad.
  64                  */
  65                 fse->min_width = format->width;
  66                 fse->max_width = format->width;
  67                 fse->min_height = format->height;
  68                 fse->max_height = format->height;
  69         }
  70
  71         return 0;
  72 }
  73
  74 int vsp1_rwpf_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
  75                          struct v4l2_subdev_format *fmt)
  76 {
  77         struct vsp1_rwpf *rwpf = to_rwpf(subdev);
  78
  79         fmt->format = *vsp1_entity_get_pad_format(&rwpf->entity, fh, fmt->pad,
  80                                                   fmt->which);
  81
  82         return 0;
  83 }
  84
  85 int vsp1_rwpf_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
  86                          struct v4l2_subdev_format *fmt)
  87 {
  88         struct vsp1_rwpf *rwpf = to_rwpf(subdev);
  89         struct v4l2_mbus_framefmt *format;
  90
  91         /* Default to YUV if the requested format is not supported. */
  92         if (fmt->format.code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
  93             fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32)
  94                 fmt->format.code = V4L2_MBUS_FMT_AYUV8_1X32;
  95
  96         format = vsp1_entity_get_pad_format(&rwpf->entity, fh, fmt->pad,
  97                                             fmt->which);
  98
  99         if (fmt->pad == RWPF_PAD_SOURCE) {
 100                 /* The RWPF performs format conversion but can't scale, only the
 101                  * format code can be changed on the source pad.
 102                  */
 103                 format->code = fmt->format.code;
 104                 fmt->format = *format;
 105                 return 0;
 106         }
 107
 108         format->code = fmt->format.code;
 109         format->width = clamp_t(unsigned int, fmt->format.width,
 110                                 RWPF_MIN_WIDTH, rwpf->max_width);
 111         format->height = clamp_t(unsigned int, fmt->format.height,
 112                                  RWPF_MIN_HEIGHT, rwpf->max_height);
 113         format->field = V4L2_FIELD_NONE;
 114         format->colorspace = V4L2_COLORSPACE_SRGB;
 115
 116         fmt->format = *format;
 117
 118         /* Propagate the format to the source pad. */
 119         format = vsp1_entity_get_pad_format(&rwpf->entity, fh, RWPF_PAD_SOURCE,
 120                                             fmt->which);
 121         *format = fmt->format;
 122
 123         return 0;
 124 }