drivers/media/platform/vsp1/vsp1_hsit.c

   1 /*
   2  * vsp1_hsit.c  --  R-Car VSP1 Hue Saturation value (Inverse) Transform
   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 <linux/device.h>
  15 #include <linux/gfp.h>
  16
  17 #include <media/v4l2-subdev.h>
  18
  19 #include "vsp1.h"
  20 #include "vsp1_dl.h"
  21 #include "vsp1_hsit.h"
  22
  23 #define HSIT_MIN_SIZE                           4U
  24 #define HSIT_MAX_SIZE                           8190U
  25
  26 /* -----------------------------------------------------------------------------
  27  * Device Access
  28  */
  29
  30 static inline void vsp1_hsit_write(struct vsp1_hsit *hsit,
  31                                    struct vsp1_dl_list *dl, u32 reg, u32 data)
  32 {
  33         vsp1_dl_list_write(dl, reg, data);
  34 }
  35
  36 /* -----------------------------------------------------------------------------
  37  * V4L2 Subdevice Operations
  38  */
  39
  40 static int hsit_enum_mbus_code(struct v4l2_subdev *subdev,
  41                                struct v4l2_subdev_pad_config *cfg,
  42                                struct v4l2_subdev_mbus_code_enum *code)
  43 {
  44         struct vsp1_hsit *hsit = to_hsit(subdev);
  45
  46         if (code->index > 0)
  47                 return -EINVAL;
  48
  49         if ((code->pad == HSIT_PAD_SINK && !hsit->inverse) |
  50             (code->pad == HSIT_PAD_SOURCE && hsit->inverse))
  51                 code->code = MEDIA_BUS_FMT_ARGB8888_1X32;
  52         else
  53                 code->code = MEDIA_BUS_FMT_AHSV8888_1X32;
  54
  55         return 0;
  56 }
  57
  58 static int hsit_enum_frame_size(struct v4l2_subdev *subdev,
  59                                 struct v4l2_subdev_pad_config *cfg,
  60                                 struct v4l2_subdev_frame_size_enum *fse)
  61 {
  62         return vsp1_subdev_enum_frame_size(subdev, cfg, fse, HSIT_MIN_SIZE,
  63                                            HSIT_MIN_SIZE, HSIT_MAX_SIZE,
  64                                            HSIT_MAX_SIZE);
  65 }
  66
  67 static int hsit_set_format(struct v4l2_subdev *subdev,
  68                            struct v4l2_subdev_pad_config *cfg,
  69                            struct v4l2_subdev_format *fmt)
  70 {
  71         struct vsp1_hsit *hsit = to_hsit(subdev);
  72         struct v4l2_subdev_pad_config *config;
  73         struct v4l2_mbus_framefmt *format;
  74
  75         config = vsp1_entity_get_pad_config(&hsit->entity, cfg, fmt->which);
  76         if (!config)
  77                 return -EINVAL;
  78
  79         format = vsp1_entity_get_pad_format(&hsit->entity, config, fmt->pad);
  80
  81         if (fmt->pad == HSIT_PAD_SOURCE) {
  82                 /* The HST and HSI output format code and resolution can't be
  83                  * modified.
  84                  */
  85                 fmt->format = *format;
  86                 return 0;
  87         }
  88
  89         format->code = hsit->inverse ? MEDIA_BUS_FMT_AHSV8888_1X32
  90                      : MEDIA_BUS_FMT_ARGB8888_1X32;
  91         format->width = clamp_t(unsigned int, fmt->format.width,
  92                                 HSIT_MIN_SIZE, HSIT_MAX_SIZE);
  93         format->height = clamp_t(unsigned int, fmt->format.height,
  94                                  HSIT_MIN_SIZE, HSIT_MAX_SIZE);
  95         format->field = V4L2_FIELD_NONE;
  96         format->colorspace = V4L2_COLORSPACE_SRGB;
  97
  98         fmt->format = *format;
  99
 100         /* Propagate the format to the source pad. */
 101         format = vsp1_entity_get_pad_format(&hsit->entity, config,
 102                                             HSIT_PAD_SOURCE);
 103         *format = fmt->format;
 104         format->code = hsit->inverse ? MEDIA_BUS_FMT_ARGB8888_1X32
 105                      : MEDIA_BUS_FMT_AHSV8888_1X32;
 106
 107         return 0;
 108 }
 109
 110 static const struct v4l2_subdev_pad_ops hsit_pad_ops = {
 111         .init_cfg = vsp1_entity_init_cfg,
 112         .enum_mbus_code = hsit_enum_mbus_code,
 113         .enum_frame_size = hsit_enum_frame_size,
 114         .get_fmt = vsp1_subdev_get_pad_format,
 115         .set_fmt = hsit_set_format,
 116 };
 117
 118 static const struct v4l2_subdev_ops hsit_ops = {
 119         .pad    = &hsit_pad_ops,
 120 };
 121
 122 /* -----------------------------------------------------------------------------
 123  * VSP1 Entity Operations
 124  */
 125
 126 static void hsit_configure(struct vsp1_entity *entity,
 127                            struct vsp1_pipeline *pipe,
 128                            struct vsp1_dl_list *dl)
 129 {
 130         struct vsp1_hsit *hsit = to_hsit(&entity->subdev);
 131
 132         if (hsit->inverse)
 133                 vsp1_hsit_write(hsit, dl, VI6_HSI_CTRL, VI6_HSI_CTRL_EN);
 134         else
 135                 vsp1_hsit_write(hsit, dl, VI6_HST_CTRL, VI6_HST_CTRL_EN);
 136 }
 137
 138 static const struct vsp1_entity_operations hsit_entity_ops = {
 139         .configure = hsit_configure,
 140 };
 141
 142 /* -----------------------------------------------------------------------------
 143  * Initialization and Cleanup
 144  */
 145
 146 struct vsp1_hsit *vsp1_hsit_create(struct vsp1_device *vsp1, bool inverse)
 147 {
 148         struct vsp1_hsit *hsit;
 149         int ret;
 150
 151         hsit = devm_kzalloc(vsp1->dev, sizeof(*hsit), GFP_KERNEL);
 152         if (hsit == NULL)
 153                 return ERR_PTR(-ENOMEM);
 154
 155         hsit->inverse = inverse;
 156
 157         hsit->entity.ops = &hsit_entity_ops;
 158
 159         if (inverse)
 160                 hsit->entity.type = VSP1_ENTITY_HSI;
 161         else
 162                 hsit->entity.type = VSP1_ENTITY_HST;
 163
 164         ret = vsp1_entity_init(vsp1, &hsit->entity, inverse ? "hsi" : "hst", 2,
 165                                &hsit_ops);
 166         if (ret < 0)
 167                 return ERR_PTR(ret);
 168
 169         return hsit;
 170 }