drivers/media/platform/vsp1/vsp1_hgt.c

   1 /*
   2  * vsp1_hgt.c  --  R-Car VSP1 Histogram Generator 2D
   3  *
   4  * Copyright (C) 2016 Renesas Electronics Corporation
   5  *
   6  * Contact: Niklas Söderlund (niklas.soderlund@ragnatech.se)
   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 #include <media/videobuf2-vmalloc.h>
  19
  20 #include "vsp1.h"
  21 #include "vsp1_dl.h"
  22 #include "vsp1_hgt.h"
  23
  24 #define HGT_DATA_SIZE                           ((2 +  6 * 32) * 4)
  25
  26 /* -----------------------------------------------------------------------------
  27  * Device Access
  28  */
  29
  30 static inline u32 vsp1_hgt_read(struct vsp1_hgt *hgt, u32 reg)
  31 {
  32         return vsp1_read(hgt->histo.entity.vsp1, reg);
  33 }
  34
  35 static inline void vsp1_hgt_write(struct vsp1_hgt *hgt, struct vsp1_dl_list *dl,
  36                                   u32 reg, u32 data)
  37 {
  38         vsp1_dl_list_write(dl, reg, data);
  39 }
  40
  41 /* -----------------------------------------------------------------------------
  42  * Frame End Handler
  43  */
  44
  45 void vsp1_hgt_frame_end(struct vsp1_entity *entity)
  46 {
  47         struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
  48         struct vsp1_histogram_buffer *buf;
  49         unsigned int m;
  50         unsigned int n;
  51         u32 *data;
  52
  53         buf = vsp1_histogram_buffer_get(&hgt->histo);
  54         if (!buf)
  55                 return;
  56
  57         data = buf->addr;
  58
  59         *data++ = vsp1_hgt_read(hgt, VI6_HGT_MAXMIN);
  60         *data++ = vsp1_hgt_read(hgt, VI6_HGT_SUM);
  61
  62         for (m = 0; m < 6; ++m)
  63                 for (n = 0; n < 32; ++n)
  64                         *data++ = vsp1_hgt_read(hgt, VI6_HGT_HISTO(m, n));
  65
  66         vsp1_histogram_buffer_complete(&hgt->histo, buf, HGT_DATA_SIZE);
  67 }
  68
  69 /* -----------------------------------------------------------------------------
  70  * Controls
  71  */
  72
  73 #define V4L2_CID_VSP1_HGT_HUE_AREAS     (V4L2_CID_USER_BASE | 0x1001)
  74
  75 static int hgt_hue_areas_try_ctrl(struct v4l2_ctrl *ctrl)
  76 {
  77         const u8 *values = ctrl->p_new.p_u8;
  78         unsigned int i;
  79
  80         /*
  81          * The hardware has constraints on the hue area boundaries beyond the
  82          * control min, max and step. The values must match one of the following
  83          * expressions.
  84          *
  85          * 0L <= 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U
  86          * 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U <= 0L
  87          *
  88          * Start by verifying the common part...
  89          */
  90         for (i = 1; i < (HGT_NUM_HUE_AREAS * 2) - 1; ++i) {
  91                 if (values[i] > values[i+1])
  92                         return -EINVAL;
  93         }
  94
  95         /* ... and handle 0L separately. */
  96         if (values[0] > values[1] && values[11] > values[0])
  97                 return -EINVAL;
  98
  99         return 0;
 100 }
 101
 102 static int hgt_hue_areas_s_ctrl(struct v4l2_ctrl *ctrl)
 103 {
 104         struct vsp1_hgt *hgt = container_of(ctrl->handler, struct vsp1_hgt,
 105                                             ctrls);
 106
 107         memcpy(hgt->hue_areas, ctrl->p_new.p_u8, sizeof(hgt->hue_areas));
 108         return 0;
 109 }
 110
 111 static const struct v4l2_ctrl_ops hgt_hue_areas_ctrl_ops = {
 112         .try_ctrl = hgt_hue_areas_try_ctrl,
 113         .s_ctrl = hgt_hue_areas_s_ctrl,
 114 };
 115
 116 static const struct v4l2_ctrl_config hgt_hue_areas = {
 117         .ops = &hgt_hue_areas_ctrl_ops,
 118         .id = V4L2_CID_VSP1_HGT_HUE_AREAS,
 119         .name = "Boundary Values for Hue Area",
 120         .type = V4L2_CTRL_TYPE_U8,
 121         .min = 0,
 122         .max = 255,
 123         .def = 0,
 124         .step = 1,
 125         .dims = { 12 },
 126 };
 127
 128 /* -----------------------------------------------------------------------------
 129  * VSP1 Entity Operations
 130  */
 131
 132 static void hgt_configure(struct vsp1_entity *entity,
 133                           struct vsp1_pipeline *pipe,
 134                           struct vsp1_dl_list *dl,
 135                           enum vsp1_entity_params params)
 136 {
 137         struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
 138         struct v4l2_rect *compose;
 139         struct v4l2_rect *crop;
 140         unsigned int hratio;
 141         unsigned int vratio;
 142         u8 lower;
 143         u8 upper;
 144         unsigned int i;
 145
 146         if (params != VSP1_ENTITY_PARAMS_INIT)
 147                 return;
 148
 149         crop = vsp1_entity_get_pad_selection(entity, entity->config,
 150                                              HISTO_PAD_SINK, V4L2_SEL_TGT_CROP);
 151         compose = vsp1_entity_get_pad_selection(entity, entity->config,
 152                                                 HISTO_PAD_SINK,
 153                                                 V4L2_SEL_TGT_COMPOSE);
 154
 155         vsp1_hgt_write(hgt, dl, VI6_HGT_REGRST, VI6_HGT_REGRST_RCLEA);
 156
 157         vsp1_hgt_write(hgt, dl, VI6_HGT_OFFSET,
 158                        (crop->left << VI6_HGT_OFFSET_HOFFSET_SHIFT) |
 159                        (crop->top << VI6_HGT_OFFSET_VOFFSET_SHIFT));
 160         vsp1_hgt_write(hgt, dl, VI6_HGT_SIZE,
 161                        (crop->width << VI6_HGT_SIZE_HSIZE_SHIFT) |
 162                        (crop->height << VI6_HGT_SIZE_VSIZE_SHIFT));
 163
 164         mutex_lock(hgt->ctrls.lock);
 165         for (i = 0; i < HGT_NUM_HUE_AREAS; ++i) {
 166                 lower = hgt->hue_areas[i*2 + 0];
 167                 upper = hgt->hue_areas[i*2 + 1];
 168                 vsp1_hgt_write(hgt, dl, VI6_HGT_HUE_AREA(i),
 169                                (lower << VI6_HGT_HUE_AREA_LOWER_SHIFT) |
 170                                (upper << VI6_HGT_HUE_AREA_UPPER_SHIFT));
 171         }
 172         mutex_unlock(hgt->ctrls.lock);
 173
 174         hratio = crop->width * 2 / compose->width / 3;
 175         vratio = crop->height * 2 / compose->height / 3;
 176         vsp1_hgt_write(hgt, dl, VI6_HGT_MODE,
 177                        (hratio << VI6_HGT_MODE_HRATIO_SHIFT) |
 178                        (vratio << VI6_HGT_MODE_VRATIO_SHIFT));
 179 }
 180
 181 static const struct vsp1_entity_operations hgt_entity_ops = {
 182         .configure = hgt_configure,
 183         .destroy = vsp1_histogram_destroy,
 184 };
 185
 186 /* -----------------------------------------------------------------------------
 187  * Initialization and Cleanup
 188  */
 189
 190 static const unsigned int hgt_mbus_formats[] = {
 191         MEDIA_BUS_FMT_AHSV8888_1X32,
 192 };
 193
 194 struct vsp1_hgt *vsp1_hgt_create(struct vsp1_device *vsp1)
 195 {
 196         struct vsp1_hgt *hgt;
 197         int ret;
 198
 199         hgt = devm_kzalloc(vsp1->dev, sizeof(*hgt), GFP_KERNEL);
 200         if (hgt == NULL)
 201                 return ERR_PTR(-ENOMEM);
 202
 203         /* Initialize the control handler. */
 204         v4l2_ctrl_handler_init(&hgt->ctrls, 1);
 205         v4l2_ctrl_new_custom(&hgt->ctrls, &hgt_hue_areas, NULL);
 206
 207         hgt->histo.entity.subdev.ctrl_handler = &hgt->ctrls;
 208
 209         /* Initialize the video device and queue for statistics data. */
 210         ret = vsp1_histogram_init(vsp1, &hgt->histo, VSP1_ENTITY_HGT, "hgt",
 211                                   &hgt_entity_ops, hgt_mbus_formats,
 212                                   ARRAY_SIZE(hgt_mbus_formats),
 213                                   HGT_DATA_SIZE, V4L2_META_FMT_VSP1_HGT);
 214         if (ret < 0) {
 215                 vsp1_entity_destroy(&hgt->histo.entity);
 216                 return ERR_PTR(ret);
 217         }
 218
 219         v4l2_ctrl_handler_setup(&hgt->ctrls);
 220
 221         return hgt;
 222 }