drivers/media/platform/vsp1/vsp1_lut.c

   1 /*
   2  * vsp1_lut.c  --  R-Car VSP1 Look-Up Table
   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 #include <linux/vsp1.h>
  17
  18 #include <media/v4l2-subdev.h>
  19
  20 #include "vsp1.h"
  21 #include "vsp1_lut.h"
  22
  23 #define LUT_MIN_SIZE                            4U
  24 #define LUT_MAX_SIZE                            8190U
  25
  26 /* -----------------------------------------------------------------------------
  27  * Device Access
  28  */
  29
  30 static inline void vsp1_lut_write(struct vsp1_lut *lut, u32 reg, u32 data)
  31 {
  32         vsp1_write(lut->entity.vsp1, reg, data);
  33 }
  34
  35 /* -----------------------------------------------------------------------------
  36  * V4L2 Subdevice Core Operations
  37  */
  38
  39 static void lut_configure(struct vsp1_lut *lut, struct vsp1_lut_config *config)
  40 {
  41         memcpy_toio(lut->entity.vsp1->mmio + VI6_LUT_TABLE, config->lut,
  42                     sizeof(config->lut));
  43 }
  44
  45 static long lut_ioctl(struct v4l2_subdev *subdev, unsigned int cmd, void *arg)
  46 {
  47         struct vsp1_lut *lut = to_lut(subdev);
  48
  49         switch (cmd) {
  50         case VIDIOC_VSP1_LUT_CONFIG:
  51                 lut_configure(lut, arg);
  52                 return 0;
  53
  54         default:
  55                 return -ENOIOCTLCMD;
  56         }
  57 }
  58
  59 /* -----------------------------------------------------------------------------
  60  * V4L2 Subdevice Video Operations
  61  */
  62
  63 static int lut_s_stream(struct v4l2_subdev *subdev, int enable)
  64 {
  65         struct vsp1_lut *lut = to_lut(subdev);
  66
  67         if (!enable)
  68                 return 0;
  69
  70         vsp1_lut_write(lut, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
  71
  72         return 0;
  73 }
  74
  75 /* -----------------------------------------------------------------------------
  76  * V4L2 Subdevice Pad Operations
  77  */
  78
  79 static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
  80                               struct v4l2_subdev_pad_config *cfg,
  81                               struct v4l2_subdev_mbus_code_enum *code)
  82 {
  83         static const unsigned int codes[] = {
  84                 MEDIA_BUS_FMT_ARGB8888_1X32,
  85                 MEDIA_BUS_FMT_AHSV8888_1X32,
  86                 MEDIA_BUS_FMT_AYUV8_1X32,
  87         };
  88         struct vsp1_lut *lut = to_lut(subdev);
  89         struct v4l2_mbus_framefmt *format;
  90
  91         if (code->pad == LUT_PAD_SINK) {
  92                 if (code->index >= ARRAY_SIZE(codes))
  93                         return -EINVAL;
  94
  95                 code->code = codes[code->index];
  96         } else {
  97                 /* The LUT can't perform format conversion, the sink format is
  98                  * always identical to the source format.
  99                  */
 100                 if (code->index)
 101                         return -EINVAL;
 102
 103                 format = vsp1_entity_get_pad_format(&lut->entity, cfg,
 104                                                     LUT_PAD_SINK, code->which);
 105                 code->code = format->code;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int lut_enum_frame_size(struct v4l2_subdev *subdev,
 112                                struct v4l2_subdev_pad_config *cfg,
 113                                struct v4l2_subdev_frame_size_enum *fse)
 114 {
 115         struct vsp1_lut *lut = to_lut(subdev);
 116         struct v4l2_mbus_framefmt *format;
 117
 118         format = vsp1_entity_get_pad_format(&lut->entity, cfg,
 119                                             fse->pad, fse->which);
 120
 121         if (fse->index || fse->code != format->code)
 122                 return -EINVAL;
 123
 124         if (fse->pad == LUT_PAD_SINK) {
 125                 fse->min_width = LUT_MIN_SIZE;
 126                 fse->max_width = LUT_MAX_SIZE;
 127                 fse->min_height = LUT_MIN_SIZE;
 128                 fse->max_height = LUT_MAX_SIZE;
 129         } else {
 130                 /* The size on the source pad are fixed and always identical to
 131                  * the size on the sink pad.
 132                  */
 133                 fse->min_width = format->width;
 134                 fse->max_width = format->width;
 135                 fse->min_height = format->height;
 136                 fse->max_height = format->height;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int lut_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
 143                           struct v4l2_subdev_format *fmt)
 144 {
 145         struct vsp1_lut *lut = to_lut(subdev);
 146
 147         fmt->format = *vsp1_entity_get_pad_format(&lut->entity, cfg, fmt->pad,
 148                                                   fmt->which);
 149
 150         return 0;
 151 }
 152
 153 static int lut_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
 154                           struct v4l2_subdev_format *fmt)
 155 {
 156         struct vsp1_lut *lut = to_lut(subdev);
 157         struct v4l2_mbus_framefmt *format;
 158
 159         /* Default to YUV if the requested format is not supported. */
 160         if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 161             fmt->format.code != MEDIA_BUS_FMT_AHSV8888_1X32 &&
 162             fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
 163                 fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;
 164
 165         format = vsp1_entity_get_pad_format(&lut->entity, cfg, fmt->pad,
 166                                             fmt->which);
 167
 168         if (fmt->pad == LUT_PAD_SOURCE) {
 169                 /* The LUT output format can't be modified. */
 170                 fmt->format = *format;
 171                 return 0;
 172         }
 173
 174         format->width = clamp_t(unsigned int, fmt->format.width,
 175                                 LUT_MIN_SIZE, LUT_MAX_SIZE);
 176         format->height = clamp_t(unsigned int, fmt->format.height,
 177                                  LUT_MIN_SIZE, LUT_MAX_SIZE);
 178         format->field = V4L2_FIELD_NONE;
 179         format->colorspace = V4L2_COLORSPACE_SRGB;
 180
 181         fmt->format = *format;
 182
 183         /* Propagate the format to the source pad. */
 184         format = vsp1_entity_get_pad_format(&lut->entity, cfg, LUT_PAD_SOURCE,
 185                                             fmt->which);
 186         *format = fmt->format;
 187
 188         return 0;
 189 }
 190
 191 /* -----------------------------------------------------------------------------
 192  * V4L2 Subdevice Operations
 193  */
 194
 195 static struct v4l2_subdev_core_ops lut_core_ops = {
 196         .ioctl = lut_ioctl,
 197 };
 198
 199 static struct v4l2_subdev_video_ops lut_video_ops = {
 200         .s_stream = lut_s_stream,
 201 };
 202
 203 static struct v4l2_subdev_pad_ops lut_pad_ops = {
 204         .enum_mbus_code = lut_enum_mbus_code,
 205         .enum_frame_size = lut_enum_frame_size,
 206         .get_fmt = lut_get_format,
 207         .set_fmt = lut_set_format,
 208 };
 209
 210 static struct v4l2_subdev_ops lut_ops = {
 211         .core   = &lut_core_ops,
 212         .video  = &lut_video_ops,
 213         .pad    = &lut_pad_ops,
 214 };
 215
 216 /* -----------------------------------------------------------------------------
 217  * Initialization and Cleanup
 218  */
 219
 220 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
 221 {
 222         struct v4l2_subdev *subdev;
 223         struct vsp1_lut *lut;
 224         int ret;
 225
 226         lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
 227         if (lut == NULL)
 228                 return ERR_PTR(-ENOMEM);
 229
 230         lut->entity.type = VSP1_ENTITY_LUT;
 231
 232         ret = vsp1_entity_init(vsp1, &lut->entity, 2);
 233         if (ret < 0)
 234                 return ERR_PTR(ret);
 235
 236         /* Initialize the V4L2 subdev. */
 237         subdev = &lut->entity.subdev;
 238         v4l2_subdev_init(subdev, &lut_ops);
 239
 240         subdev->entity.ops = &vsp1->media_ops;
 241         subdev->internal_ops = &vsp1_subdev_internal_ops;
 242         snprintf(subdev->name, sizeof(subdev->name), "%s lut",
 243                  dev_name(vsp1->dev));
 244         v4l2_set_subdevdata(subdev, lut);
 245         subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 246
 247         vsp1_entity_init_formats(subdev, NULL);
 248
 249         return lut;
 250 }