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         spin_lock_irq(&lut->lock);
  56         swap(lut->lut, dlb);
  57         spin_unlock_irq(&lut->lock);
  58
  59         vsp1_dl_fragment_free(dlb);
  60         return 0;
  61 }
  62
  63 static int lut_s_ctrl(struct v4l2_ctrl *ctrl)
  64 {
  65         struct vsp1_lut *lut =
  66                 container_of(ctrl->handler, struct vsp1_lut, ctrls);
  67
  68         switch (ctrl->id) {
  69         case V4L2_CID_VSP1_LUT_TABLE:
  70                 lut_set_table(lut, ctrl);
  71                 break;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static const struct v4l2_ctrl_ops lut_ctrl_ops = {
  78         .s_ctrl = lut_s_ctrl,
  79 };
  80
  81 static const struct v4l2_ctrl_config lut_table_control = {
  82         .ops = &lut_ctrl_ops,
  83         .id = V4L2_CID_VSP1_LUT_TABLE,
  84         .name = "Look-Up Table",
  85         .type = V4L2_CTRL_TYPE_U32,
  86         .min = 0x00000000,
  87         .max = 0x00ffffff,
  88         .step = 1,
  89         .def = 0,
  90         .dims = { 256},
  91 };
  92
  93 /* -----------------------------------------------------------------------------
  94  * V4L2 Subdevice Pad Operations
  95  */
  96
  97 static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
  98                               struct v4l2_subdev_pad_config *cfg,
  99                               struct v4l2_subdev_mbus_code_enum *code)
 100 {
 101         static const unsigned int codes[] = {
 102                 MEDIA_BUS_FMT_ARGB8888_1X32,
 103                 MEDIA_BUS_FMT_AHSV8888_1X32,
 104                 MEDIA_BUS_FMT_AYUV8_1X32,
 105         };
 106
 107         return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
 108                                           ARRAY_SIZE(codes));
 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         return vsp1_subdev_enum_frame_size(subdev, cfg, fse, LUT_MIN_SIZE,
 116                                            LUT_MIN_SIZE, LUT_MAX_SIZE,
 117                                            LUT_MAX_SIZE);
 118 }
 119
 120 static int lut_set_format(struct v4l2_subdev *subdev,
 121                           struct v4l2_subdev_pad_config *cfg,
 122                           struct v4l2_subdev_format *fmt)
 123 {
 124         struct vsp1_lut *lut = to_lut(subdev);
 125         struct v4l2_subdev_pad_config *config;
 126         struct v4l2_mbus_framefmt *format;
 127
 128         config = vsp1_entity_get_pad_config(&lut->entity, cfg, fmt->which);
 129         if (!config)
 130                 return -EINVAL;
 131
 132         /* Default to YUV if the requested format is not supported. */
 133         if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 134             fmt->format.code != MEDIA_BUS_FMT_AHSV8888_1X32 &&
 135             fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
 136                 fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;
 137
 138         format = vsp1_entity_get_pad_format(&lut->entity, config, fmt->pad);
 139
 140         if (fmt->pad == LUT_PAD_SOURCE) {
 141                 /* The LUT output format can't be modified. */
 142                 fmt->format = *format;
 143                 return 0;
 144         }
 145
 146         format->code = fmt->format.code;
 147         format->width = clamp_t(unsigned int, fmt->format.width,
 148                                 LUT_MIN_SIZE, LUT_MAX_SIZE);
 149         format->height = clamp_t(unsigned int, fmt->format.height,
 150                                  LUT_MIN_SIZE, LUT_MAX_SIZE);
 151         format->field = V4L2_FIELD_NONE;
 152         format->colorspace = V4L2_COLORSPACE_SRGB;
 153
 154         fmt->format = *format;
 155
 156         /* Propagate the format to the source pad. */
 157         format = vsp1_entity_get_pad_format(&lut->entity, config,
 158                                             LUT_PAD_SOURCE);
 159         *format = fmt->format;
 160
 161         return 0;
 162 }
 163
 164 /* -----------------------------------------------------------------------------
 165  * V4L2 Subdevice Operations
 166  */
 167
 168 static const struct v4l2_subdev_pad_ops lut_pad_ops = {
 169         .init_cfg = vsp1_entity_init_cfg,
 170         .enum_mbus_code = lut_enum_mbus_code,
 171         .enum_frame_size = lut_enum_frame_size,
 172         .get_fmt = vsp1_subdev_get_pad_format,
 173         .set_fmt = lut_set_format,
 174 };
 175
 176 static const struct v4l2_subdev_ops lut_ops = {
 177         .pad    = &lut_pad_ops,
 178 };
 179
 180 /* -----------------------------------------------------------------------------
 181  * VSP1 Entity Operations
 182  */
 183
 184 static void lut_configure(struct vsp1_entity *entity,
 185                           struct vsp1_pipeline *pipe,
 186                           struct vsp1_dl_list *dl, bool full)
 187 {
 188         struct vsp1_lut *lut = to_lut(&entity->subdev);
 189         struct vsp1_dl_body *dlb;
 190         unsigned long flags;
 191
 192         if (full) {
 193                 vsp1_lut_write(lut, dl, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
 194                 return;
 195         }
 196
 197         spin_lock_irqsave(&lut->lock, flags);
 198         dlb = lut->lut;
 199         lut->lut = NULL;
 200         spin_unlock_irqrestore(&lut->lock, flags);
 201
 202         if (dlb)
 203                 vsp1_dl_list_add_fragment(dl, dlb);
 204 }
 205
 206 static const struct vsp1_entity_operations lut_entity_ops = {
 207         .configure = lut_configure,
 208 };
 209
 210 /* -----------------------------------------------------------------------------
 211  * Initialization and Cleanup
 212  */
 213
 214 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
 215 {
 216         struct vsp1_lut *lut;
 217         int ret;
 218
 219         lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
 220         if (lut == NULL)
 221                 return ERR_PTR(-ENOMEM);
 222
 223         spin_lock_init(&lut->lock);
 224
 225         lut->entity.ops = &lut_entity_ops;
 226         lut->entity.type = VSP1_ENTITY_LUT;
 227
 228         ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
 229                                MEDIA_ENT_F_PROC_VIDEO_LUT);
 230         if (ret < 0)
 231                 return ERR_PTR(ret);
 232
 233         /* Initialize the control handler. */
 234         v4l2_ctrl_handler_init(&lut->ctrls, 1);
 235         v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
 236
 237         lut->entity.subdev.ctrl_handler = &lut->ctrls;
 238
 239         if (lut->ctrls.error) {
 240                 dev_err(vsp1->dev, "lut: failed to initialize controls\n");
 241                 ret = lut->ctrls.error;
 242                 vsp1_entity_destroy(&lut->entity);
 243                 return ERR_PTR(ret);
 244         }
 245
 246         v4l2_ctrl_handler_setup(&lut->ctrls);
 247
 248         return lut;
 249 }