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
  17 #include <media/v4l2-subdev.h>
  18
  19 #include "vsp1.h"
  20 #include "vsp1_dl.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, struct vsp1_dl_list *dl,
  31                                   u32 reg, u32 data)
  32 {
  33         vsp1_dl_list_write(dl, reg, data);
  34 }
  35
  36 /* -----------------------------------------------------------------------------
  37  * Controls
  38  */
  39
  40 #define V4L2_CID_VSP1_LUT_TABLE                 (V4L2_CID_USER_BASE | 0x1001)
  41
  42 static int lut_set_table(struct vsp1_lut *lut, struct v4l2_ctrl *ctrl)
  43 {
  44         struct vsp1_dl_body *dlb;
  45         unsigned int i;
  46
  47         dlb = vsp1_dl_fragment_alloc(lut->entity.vsp1, 256);
  48         if (!dlb)
  49                 return -ENOMEM;
  50
  51         for (i = 0; i < 256; ++i)
  52                 vsp1_dl_fragment_write(dlb, VI6_LUT_TABLE + 4 * i,
  53                                        ctrl->p_new.p_u32[i]);
  54
  55         swap(lut->lut, dlb);
  56
  57         vsp1_dl_fragment_free(dlb);
  58         return 0;
  59 }
  60
  61 static int lut_s_ctrl(struct v4l2_ctrl *ctrl)
  62 {
  63         struct vsp1_lut *lut =
  64                 container_of(ctrl->handler, struct vsp1_lut, ctrls);
  65
  66         switch (ctrl->id) {
  67         case V4L2_CID_VSP1_LUT_TABLE:
  68                 lut_set_table(lut, ctrl);
  69                 break;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static const struct v4l2_ctrl_ops lut_ctrl_ops = {
  76         .s_ctrl = lut_s_ctrl,
  77 };
  78
  79 static const struct v4l2_ctrl_config lut_table_control = {
  80         .ops = &lut_ctrl_ops,
  81         .id = V4L2_CID_VSP1_LUT_TABLE,
  82         .name = "Look-Up Table",
  83         .type = V4L2_CTRL_TYPE_U32,
  84         .min = 0x00000000,
  85         .max = 0x00ffffff,
  86         .step = 1,
  87         .def = 0,
  88         .dims = { 256},
  89 };
  90
  91 /* -----------------------------------------------------------------------------
  92  * V4L2 Subdevice Pad Operations
  93  */
  94
  95 static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
  96                               struct v4l2_subdev_pad_config *cfg,
  97                               struct v4l2_subdev_mbus_code_enum *code)
  98 {
  99         static const unsigned int codes[] = {
 100                 MEDIA_BUS_FMT_ARGB8888_1X32,
 101                 MEDIA_BUS_FMT_AHSV8888_1X32,
 102                 MEDIA_BUS_FMT_AYUV8_1X32,
 103         };
 104
 105         return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
 106                                           ARRAY_SIZE(codes));
 107 }
 108
 109 static int lut_enum_frame_size(struct v4l2_subdev *subdev,
 110                                struct v4l2_subdev_pad_config *cfg,
 111                                struct v4l2_subdev_frame_size_enum *fse)
 112 {
 113         return vsp1_subdev_enum_frame_size(subdev, cfg, fse, LUT_MIN_SIZE,
 114                                            LUT_MIN_SIZE, LUT_MAX_SIZE,
 115                                            LUT_MAX_SIZE);
 116 }
 117
 118 static int lut_set_format(struct v4l2_subdev *subdev,
 119                           struct v4l2_subdev_pad_config *cfg,
 120                           struct v4l2_subdev_format *fmt)
 121 {
 122         struct vsp1_lut *lut = to_lut(subdev);
 123         struct v4l2_subdev_pad_config *config;
 124         struct v4l2_mbus_framefmt *format;
 125
 126         config = vsp1_entity_get_pad_config(&lut->entity, cfg, fmt->which);
 127         if (!config)
 128                 return -EINVAL;
 129
 130         /* Default to YUV if the requested format is not supported. */
 131         if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 132             fmt->format.code != MEDIA_BUS_FMT_AHSV8888_1X32 &&
 133             fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
 134                 fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;
 135
 136         format = vsp1_entity_get_pad_format(&lut->entity, config, fmt->pad);
 137
 138         if (fmt->pad == LUT_PAD_SOURCE) {
 139                 /* The LUT output format can't be modified. */
 140                 fmt->format = *format;
 141                 return 0;
 142         }
 143
 144         format->code = fmt->format.code;
 145         format->width = clamp_t(unsigned int, fmt->format.width,
 146                                 LUT_MIN_SIZE, LUT_MAX_SIZE);
 147         format->height = clamp_t(unsigned int, fmt->format.height,
 148                                  LUT_MIN_SIZE, LUT_MAX_SIZE);
 149         format->field = V4L2_FIELD_NONE;
 150         format->colorspace = V4L2_COLORSPACE_SRGB;
 151
 152         fmt->format = *format;
 153
 154         /* Propagate the format to the source pad. */
 155         format = vsp1_entity_get_pad_format(&lut->entity, config,
 156                                             LUT_PAD_SOURCE);
 157         *format = fmt->format;
 158
 159         return 0;
 160 }
 161
 162 /* -----------------------------------------------------------------------------
 163  * V4L2 Subdevice Operations
 164  */
 165
 166 static const struct v4l2_subdev_pad_ops lut_pad_ops = {
 167         .init_cfg = vsp1_entity_init_cfg,
 168         .enum_mbus_code = lut_enum_mbus_code,
 169         .enum_frame_size = lut_enum_frame_size,
 170         .get_fmt = vsp1_subdev_get_pad_format,
 171         .set_fmt = lut_set_format,
 172 };
 173
 174 static const struct v4l2_subdev_ops lut_ops = {
 175         .pad    = &lut_pad_ops,
 176 };
 177
 178 /* -----------------------------------------------------------------------------
 179  * VSP1 Entity Operations
 180  */
 181
 182 static void lut_configure(struct vsp1_entity *entity,
 183                           struct vsp1_pipeline *pipe,
 184                           struct vsp1_dl_list *dl, bool full)
 185 {
 186         struct vsp1_lut *lut = to_lut(&entity->subdev);
 187
 188         if (!full)
 189                 return;
 190
 191         vsp1_lut_write(lut, dl, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
 192
 193         mutex_lock(lut->ctrls.lock);
 194
 195         if (lut->lut) {
 196                 vsp1_dl_list_add_fragment(dl, lut->lut);
 197                 lut->lut = NULL;
 198         }
 199
 200         mutex_unlock(lut->ctrls.lock);
 201 }
 202
 203 static const struct vsp1_entity_operations lut_entity_ops = {
 204         .configure = lut_configure,
 205 };
 206
 207 /* -----------------------------------------------------------------------------
 208  * Initialization and Cleanup
 209  */
 210
 211 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
 212 {
 213         struct vsp1_lut *lut;
 214         int ret;
 215
 216         lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
 217         if (lut == NULL)
 218                 return ERR_PTR(-ENOMEM);
 219
 220         lut->entity.ops = &lut_entity_ops;
 221         lut->entity.type = VSP1_ENTITY_LUT;
 222
 223         ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
 224                                MEDIA_ENT_F_PROC_VIDEO_LUT);
 225         if (ret < 0)
 226                 return ERR_PTR(ret);
 227
 228         /* Initialize the control handler. */
 229         v4l2_ctrl_handler_init(&lut->ctrls, 1);
 230         v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
 231
 232         lut->entity.subdev.ctrl_handler = &lut->ctrls;
 233
 234         if (lut->ctrls.error) {
 235                 dev_err(vsp1->dev, "lut: failed to initialize controls\n");
 236                 ret = lut->ctrls.error;
 237                 vsp1_entity_destroy(&lut->entity);
 238                 return ERR_PTR(ret);
 239         }
 240
 241         v4l2_ctrl_handler_setup(&lut->ctrls);
 242
 243         return lut;
 244 }