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 u32 vsp1_lut_read(struct vsp1_lut *lut, u32 reg)
  31 {
  32         return vsp1_read(lut->entity.vsp1, reg);
  33 }
  34
  35 static inline void vsp1_lut_write(struct vsp1_lut *lut, u32 reg, u32 data)
  36 {
  37         vsp1_write(lut->entity.vsp1, reg, data);
  38 }
  39
  40 /* -----------------------------------------------------------------------------
  41  * V4L2 Subdevice Core Operations
  42  */
  43
  44 static void lut_configure(struct vsp1_lut *lut, struct vsp1_lut_config *config)
  45 {
  46         memcpy_toio(lut->entity.vsp1->mmio + VI6_LUT_TABLE, config->lut,
  47                     sizeof(config->lut));
  48 }
  49
  50 static long lut_ioctl(struct v4l2_subdev *subdev, unsigned int cmd, void *arg)
  51 {
  52         struct vsp1_lut *lut = to_lut(subdev);
  53
  54         switch (cmd) {
  55         case VIDIOC_VSP1_LUT_CONFIG:
  56                 lut_configure(lut, arg);
  57                 return 0;
  58
  59         default:
  60                 return -ENOIOCTLCMD;
  61         }
  62 }
  63
  64 /* -----------------------------------------------------------------------------
  65  * V4L2 Subdevice Video Operations
  66  */
  67
  68 static int lut_s_stream(struct v4l2_subdev *subdev, int enable)
  69 {
  70         struct vsp1_lut *lut = to_lut(subdev);
  71
  72         if (!enable)
  73                 return 0;
  74
  75         vsp1_lut_write(lut, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
  76
  77         return 0;
  78 }
  79
  80 /* -----------------------------------------------------------------------------
  81  * V4L2 Subdevice Pad Operations
  82  */
  83
  84 static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
  85                               struct v4l2_subdev_fh *fh,
  86                               struct v4l2_subdev_mbus_code_enum *code)
  87 {
  88         static const unsigned int codes[] = {
  89                 V4L2_MBUS_FMT_ARGB8888_1X32,
  90                 V4L2_MBUS_FMT_AHSV8888_1X32,
  91                 V4L2_MBUS_FMT_AYUV8_1X32,
  92         };
  93         struct v4l2_mbus_framefmt *format;
  94
  95         if (code->pad == LUT_PAD_SINK) {
  96                 if (code->index >= ARRAY_SIZE(codes))
  97                         return -EINVAL;
  98
  99                 code->code = codes[code->index];
 100         } else {
 101                 /* The LUT can't perform format conversion, the sink format is
 102                  * always identical to the source format.
 103                  */
 104                 if (code->index)
 105                         return -EINVAL;
 106
 107                 format = v4l2_subdev_get_try_format(fh, LUT_PAD_SINK);
 108                 code->code = format->code;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static int lut_enum_frame_size(struct v4l2_subdev *subdev,
 115                                struct v4l2_subdev_fh *fh,
 116                                struct v4l2_subdev_frame_size_enum *fse)
 117 {
 118         struct v4l2_mbus_framefmt *format;
 119
 120         format = v4l2_subdev_get_try_format(fh, fse->pad);
 121
 122         if (fse->index || fse->code != format->code)
 123                 return -EINVAL;
 124
 125         if (fse->pad == LUT_PAD_SINK) {
 126                 fse->min_width = LUT_MIN_SIZE;
 127                 fse->max_width = LUT_MAX_SIZE;
 128                 fse->min_height = LUT_MIN_SIZE;
 129                 fse->max_height = LUT_MAX_SIZE;
 130         } else {
 131                 /* The size on the source pad are fixed and always identical to
 132                  * the size on the sink pad.
 133                  */
 134                 fse->min_width = format->width;
 135                 fse->max_width = format->width;
 136                 fse->min_height = format->height;
 137                 fse->max_height = format->height;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int lut_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
 144                           struct v4l2_subdev_format *fmt)
 145 {
 146         struct vsp1_lut *lut = to_lut(subdev);
 147
 148         fmt->format = *vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad,
 149                                                   fmt->which);
 150
 151         return 0;
 152 }
 153
 154 static int lut_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
 155                           struct v4l2_subdev_format *fmt)
 156 {
 157         struct vsp1_lut *lut = to_lut(subdev);
 158         struct v4l2_mbus_framefmt *format;
 159
 160         /* Default to YUV if the requested format is not supported. */
 161         if (fmt->format.code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
 162             fmt->format.code != V4L2_MBUS_FMT_AHSV8888_1X32 &&
 163             fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32)
 164                 fmt->format.code = V4L2_MBUS_FMT_AYUV8_1X32;
 165
 166         format = vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad,
 167                                             fmt->which);
 168
 169         if (fmt->pad == LUT_PAD_SOURCE) {
 170                 /* The LUT output format can't be modified. */
 171                 fmt->format = *format;
 172                 return 0;
 173         }
 174
 175         format->width = clamp_t(unsigned int, fmt->format.width,
 176                                 LUT_MIN_SIZE, LUT_MAX_SIZE);
 177         format->height = clamp_t(unsigned int, fmt->format.height,
 178                                  LUT_MIN_SIZE, LUT_MAX_SIZE);
 179         format->field = V4L2_FIELD_NONE;
 180         format->colorspace = V4L2_COLORSPACE_SRGB;
 181
 182         fmt->format = *format;
 183
 184         /* Propagate the format to the source pad. */
 185         format = vsp1_entity_get_pad_format(&lut->entity, fh, LUT_PAD_SOURCE,
 186                                             fmt->which);
 187         *format = fmt->format;
 188
 189         return 0;
 190 }
 191
 192 /* -----------------------------------------------------------------------------
 193  * V4L2 Subdevice Operations
 194  */
 195
 196 static struct v4l2_subdev_core_ops lut_core_ops = {
 197         .ioctl = lut_ioctl,
 198 };
 199
 200 static struct v4l2_subdev_video_ops lut_video_ops = {
 201         .s_stream = lut_s_stream,
 202 };
 203
 204 static struct v4l2_subdev_pad_ops lut_pad_ops = {
 205         .enum_mbus_code = lut_enum_mbus_code,
 206         .enum_frame_size = lut_enum_frame_size,
 207         .get_fmt = lut_get_format,
 208         .set_fmt = lut_set_format,
 209 };
 210
 211 static struct v4l2_subdev_ops lut_ops = {
 212         .core   = &lut_core_ops,
 213         .video  = &lut_video_ops,
 214         .pad    = &lut_pad_ops,
 215 };
 216
 217 /* -----------------------------------------------------------------------------
 218  * Initialization and Cleanup
 219  */
 220
 221 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
 222 {
 223         struct v4l2_subdev *subdev;
 224         struct vsp1_lut *lut;
 225         int ret;
 226
 227         lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
 228         if (lut == NULL)
 229                 return ERR_PTR(-ENOMEM);
 230
 231         lut->entity.type = VSP1_ENTITY_LUT;
 232
 233         ret = vsp1_entity_init(vsp1, &lut->entity, 2);
 234         if (ret < 0)
 235                 return ERR_PTR(ret);
 236
 237         /* Initialize the V4L2 subdev. */
 238         subdev = &lut->entity.subdev;
 239         v4l2_subdev_init(subdev, &lut_ops);
 240
 241         subdev->entity.ops = &vsp1_media_ops;
 242         subdev->internal_ops = &vsp1_subdev_internal_ops;
 243         snprintf(subdev->name, sizeof(subdev->name), "%s lut",
 244                  dev_name(vsp1->dev));
 245         v4l2_set_subdevdata(subdev, lut);
 246         subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 247
 248         vsp1_entity_init_formats(subdev, NULL);
 249
 250         return lut;
 251 }