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_hsit.h"
  21
  22 #define HSIT_MIN_SIZE                           4U
  23 #define HSIT_MAX_SIZE                           8190U
  24
  25 /* -----------------------------------------------------------------------------
  26  * Device Access
  27  */
  28
  29 static inline u32 vsp1_hsit_read(struct vsp1_hsit *hsit, u32 reg)
  30 {
  31         return vsp1_read(hsit->entity.vsp1, reg);
  32 }
  33
  34 static inline void vsp1_hsit_write(struct vsp1_hsit *hsit, u32 reg, u32 data)
  35 {
  36         vsp1_write(hsit->entity.vsp1, reg, data);
  37 }
  38
  39 /* -----------------------------------------------------------------------------
  40  * V4L2 Subdevice Core Operations
  41  */
  42
  43 static int hsit_s_stream(struct v4l2_subdev *subdev, int enable)
  44 {
  45         struct vsp1_hsit *hsit = to_hsit(subdev);
  46
  47         if (!enable)
  48                 return 0;
  49
  50         if (hsit->inverse)
  51                 vsp1_hsit_write(hsit, VI6_HSI_CTRL, VI6_HSI_CTRL_EN);
  52         else
  53                 vsp1_hsit_write(hsit, VI6_HST_CTRL, VI6_HST_CTRL_EN);
  54
  55         return 0;
  56 }
  57
  58 /* -----------------------------------------------------------------------------
  59  * V4L2 Subdevice Pad Operations
  60  */
  61
  62 static int hsit_enum_mbus_code(struct v4l2_subdev *subdev,
  63                                struct v4l2_subdev_fh *fh,
  64                                struct v4l2_subdev_mbus_code_enum *code)
  65 {
  66         struct vsp1_hsit *hsit = to_hsit(subdev);
  67
  68         if (code->index > 0)
  69                 return -EINVAL;
  70
  71         if ((code->pad == HSIT_PAD_SINK && !hsit->inverse) |
  72             (code->pad == HSIT_PAD_SOURCE && hsit->inverse))
  73                 code->code = V4L2_MBUS_FMT_ARGB8888_1X32;
  74         else
  75                 code->code = V4L2_MBUS_FMT_AHSV8888_1X32;
  76
  77         return 0;
  78 }
  79
  80 static int hsit_enum_frame_size(struct v4l2_subdev *subdev,
  81                                 struct v4l2_subdev_fh *fh,
  82                                 struct v4l2_subdev_frame_size_enum *fse)
  83 {
  84         struct v4l2_mbus_framefmt *format;
  85
  86         format = v4l2_subdev_get_try_format(fh, fse->pad);
  87
  88         if (fse->index || fse->code != format->code)
  89                 return -EINVAL;
  90
  91         if (fse->pad == HSIT_PAD_SINK) {
  92                 fse->min_width = HSIT_MIN_SIZE;
  93                 fse->max_width = HSIT_MAX_SIZE;
  94                 fse->min_height = HSIT_MIN_SIZE;
  95                 fse->max_height = HSIT_MAX_SIZE;
  96         } else {
  97                 /* The size on the source pad are fixed and always identical to
  98                  * the size on the sink pad.
  99                  */
 100                 fse->min_width = format->width;
 101                 fse->max_width = format->width;
 102                 fse->min_height = format->height;
 103                 fse->max_height = format->height;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int hsit_get_format(struct v4l2_subdev *subdev,
 110                            struct v4l2_subdev_fh *fh,
 111                            struct v4l2_subdev_format *fmt)
 112 {
 113         struct vsp1_hsit *hsit = to_hsit(subdev);
 114
 115         fmt->format = *vsp1_entity_get_pad_format(&hsit->entity, fh, fmt->pad,
 116                                                   fmt->which);
 117
 118         return 0;
 119 }
 120
 121 static int hsit_set_format(struct v4l2_subdev *subdev,
 122                            struct v4l2_subdev_fh *fh,
 123                            struct v4l2_subdev_format *fmt)
 124 {
 125         struct vsp1_hsit *hsit = to_hsit(subdev);
 126         struct v4l2_mbus_framefmt *format;
 127
 128         format = vsp1_entity_get_pad_format(&hsit->entity, fh, fmt->pad,
 129                                             fmt->which);
 130
 131         if (fmt->pad == HSIT_PAD_SOURCE) {
 132                 /* The HST and HSI output format code and resolution can't be
 133                  * modified.
 134                  */
 135                 fmt->format = *format;
 136                 return 0;
 137         }
 138
 139         format->code = hsit->inverse ? V4L2_MBUS_FMT_AHSV8888_1X32
 140                      : V4L2_MBUS_FMT_ARGB8888_1X32;
 141         format->width = clamp_t(unsigned int, fmt->format.width,
 142                                 HSIT_MIN_SIZE, HSIT_MAX_SIZE);
 143         format->height = clamp_t(unsigned int, fmt->format.height,
 144                                  HSIT_MIN_SIZE, HSIT_MAX_SIZE);
 145         format->field = V4L2_FIELD_NONE;
 146         format->colorspace = V4L2_COLORSPACE_SRGB;
 147
 148         fmt->format = *format;
 149
 150         /* Propagate the format to the source pad. */
 151         format = vsp1_entity_get_pad_format(&hsit->entity, fh, HSIT_PAD_SOURCE,
 152                                             fmt->which);
 153         *format = fmt->format;
 154         format->code = hsit->inverse ? V4L2_MBUS_FMT_ARGB8888_1X32
 155                      : V4L2_MBUS_FMT_AHSV8888_1X32;
 156
 157         return 0;
 158 }
 159
 160 /* -----------------------------------------------------------------------------
 161  * V4L2 Subdevice Operations
 162  */
 163
 164 static struct v4l2_subdev_video_ops hsit_video_ops = {
 165         .s_stream = hsit_s_stream,
 166 };
 167
 168 static struct v4l2_subdev_pad_ops hsit_pad_ops = {
 169         .enum_mbus_code = hsit_enum_mbus_code,
 170         .enum_frame_size = hsit_enum_frame_size,
 171         .get_fmt = hsit_get_format,
 172         .set_fmt = hsit_set_format,
 173 };
 174
 175 static struct v4l2_subdev_ops hsit_ops = {
 176         .video  = &hsit_video_ops,
 177         .pad    = &hsit_pad_ops,
 178 };
 179
 180 /* -----------------------------------------------------------------------------
 181  * Initialization and Cleanup
 182  */
 183
 184 struct vsp1_hsit *vsp1_hsit_create(struct vsp1_device *vsp1, bool inverse)
 185 {
 186         struct v4l2_subdev *subdev;
 187         struct vsp1_hsit *hsit;
 188         int ret;
 189
 190         hsit = devm_kzalloc(vsp1->dev, sizeof(*hsit), GFP_KERNEL);
 191         if (hsit == NULL)
 192                 return ERR_PTR(-ENOMEM);
 193
 194         hsit->inverse = inverse;
 195
 196         if (inverse) {
 197                 hsit->entity.type = VSP1_ENTITY_HSI;
 198                 hsit->entity.id = VI6_DPR_NODE_HSI;
 199         } else {
 200                 hsit->entity.type = VSP1_ENTITY_HST;
 201                 hsit->entity.id = VI6_DPR_NODE_HST;
 202         }
 203
 204         ret = vsp1_entity_init(vsp1, &hsit->entity, 2);
 205         if (ret < 0)
 206                 return ERR_PTR(ret);
 207
 208         /* Initialize the V4L2 subdev. */
 209         subdev = &hsit->entity.subdev;
 210         v4l2_subdev_init(subdev, &hsit_ops);
 211
 212         subdev->entity.ops = &vsp1_media_ops;
 213         subdev->internal_ops = &vsp1_subdev_internal_ops;
 214         snprintf(subdev->name, sizeof(subdev->name), "%s %s",
 215                  dev_name(vsp1->dev), inverse ? "hsi" : "hst");
 216         v4l2_set_subdevdata(subdev, hsit);
 217         subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 218
 219         vsp1_entity_init_formats(subdev, NULL);
 220
 221         return hsit;
 222 }