drivers/media/platform/vimc/vimc-scaler.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * vimc-scaler.c Virtual Media Controller Driver
   4  *
   5  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   6  */
   7
   8 #include <linux/moduleparam.h>
   9 #include <linux/vmalloc.h>
  10 #include <linux/v4l2-mediabus.h>
  11 #include <media/v4l2-subdev.h>
  12
  13 #include "vimc-common.h"
  14
  15 static unsigned int sca_mult = 3;
  16 module_param(sca_mult, uint, 0000);
  17 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
  18
  19 #define MAX_ZOOM        8
  20
  21 struct vimc_sca_device {
  22         struct vimc_ent_device ved;
  23         struct v4l2_subdev sd;
  24         struct device *dev;
  25         /* NOTE: the source fmt is the same as the sink
  26          * with the width and hight multiplied by mult
  27          */
  28         struct v4l2_mbus_framefmt sink_fmt;
  29         /* Values calculated when the stream starts */
  30         u8 *src_frame;
  31         unsigned int src_line_size;
  32         unsigned int bpp;
  33 };
  34
  35 static const struct v4l2_mbus_framefmt sink_fmt_default = {
  36         .width = 640,
  37         .height = 480,
  38         .code = MEDIA_BUS_FMT_RGB888_1X24,
  39         .field = V4L2_FIELD_NONE,
  40         .colorspace = V4L2_COLORSPACE_DEFAULT,
  41 };
  42
  43 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
  44                              struct v4l2_subdev_pad_config *cfg)
  45 {
  46         struct v4l2_mbus_framefmt *mf;
  47         unsigned int i;
  48
  49         mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  50         *mf = sink_fmt_default;
  51
  52         for (i = 1; i < sd->entity.num_pads; i++) {
  53                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
  54                 *mf = sink_fmt_default;
  55                 mf->width = mf->width * sca_mult;
  56                 mf->height = mf->height * sca_mult;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
  63                                    struct v4l2_subdev_pad_config *cfg,
  64                                    struct v4l2_subdev_mbus_code_enum *code)
  65 {
  66         const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
  67
  68         /* We don't support bayer format */
  69         if (!vpix || vpix->bayer)
  70                 return -EINVAL;
  71
  72         code->code = vpix->code;
  73
  74         return 0;
  75 }
  76
  77 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
  78                                     struct v4l2_subdev_pad_config *cfg,
  79                                     struct v4l2_subdev_frame_size_enum *fse)
  80 {
  81         const struct vimc_pix_map *vpix;
  82
  83         if (fse->index)
  84                 return -EINVAL;
  85
  86         /* Only accept code in the pix map table in non bayer format */
  87         vpix = vimc_pix_map_by_code(fse->code);
  88         if (!vpix || vpix->bayer)
  89                 return -EINVAL;
  90
  91         fse->min_width = VIMC_FRAME_MIN_WIDTH;
  92         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
  93
  94         if (VIMC_IS_SINK(fse->pad)) {
  95                 fse->max_width = VIMC_FRAME_MAX_WIDTH;
  96                 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
  97         } else {
  98                 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
  99                 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
 106                             struct v4l2_subdev_pad_config *cfg,
 107                             struct v4l2_subdev_format *format)
 108 {
 109         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 110
 111         /* Get the current sink format */
 112         format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
 113                          *v4l2_subdev_get_try_format(sd, cfg, 0) :
 114                          vsca->sink_fmt;
 115
 116         /* Scale the frame size for the source pad */
 117         if (VIMC_IS_SRC(format->pad)) {
 118                 format->format.width = vsca->sink_fmt.width * sca_mult;
 119                 format->format.height = vsca->sink_fmt.height * sca_mult;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
 126 {
 127         const struct vimc_pix_map *vpix;
 128
 129         /* Only accept code in the pix map table in non bayer format */
 130         vpix = vimc_pix_map_by_code(fmt->code);
 131         if (!vpix || vpix->bayer)
 132                 fmt->code = sink_fmt_default.code;
 133
 134         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 135                              VIMC_FRAME_MAX_WIDTH) & ~1;
 136         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 137                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 138
 139         if (fmt->field == V4L2_FIELD_ANY)
 140                 fmt->field = sink_fmt_default.field;
 141
 142         vimc_colorimetry_clamp(fmt);
 143 }
 144
 145 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
 146                             struct v4l2_subdev_pad_config *cfg,
 147                             struct v4l2_subdev_format *fmt)
 148 {
 149         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 150         struct v4l2_mbus_framefmt *sink_fmt;
 151
 152         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 153                 /* Do not change the format while stream is on */
 154                 if (vsca->src_frame)
 155                         return -EBUSY;
 156
 157                 sink_fmt = &vsca->sink_fmt;
 158         } else {
 159                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 160         }
 161
 162         /*
 163          * Do not change the format of the source pad,
 164          * it is propagated from the sink
 165          */
 166         if (VIMC_IS_SRC(fmt->pad)) {
 167                 fmt->format = *sink_fmt;
 168                 fmt->format.width = sink_fmt->width * sca_mult;
 169                 fmt->format.height = sink_fmt->height * sca_mult;
 170         } else {
 171                 /* Set the new format in the sink pad */
 172                 vimc_sca_adjust_sink_fmt(&fmt->format);
 173
 174                 dev_dbg(vsca->dev, "%s: sink format update: "
 175                         "old:%dx%d (0x%x, %d, %d, %d, %d) "
 176                         "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
 177                         /* old */
 178                         sink_fmt->width, sink_fmt->height, sink_fmt->code,
 179                         sink_fmt->colorspace, sink_fmt->quantization,
 180                         sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
 181                         /* new */
 182                         fmt->format.width, fmt->format.height, fmt->format.code,
 183                         fmt->format.colorspace, fmt->format.quantization,
 184                         fmt->format.xfer_func, fmt->format.ycbcr_enc);
 185
 186                 *sink_fmt = fmt->format;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 193         .init_cfg               = vimc_sca_init_cfg,
 194         .enum_mbus_code         = vimc_sca_enum_mbus_code,
 195         .enum_frame_size        = vimc_sca_enum_frame_size,
 196         .get_fmt                = vimc_sca_get_fmt,
 197         .set_fmt                = vimc_sca_set_fmt,
 198 };
 199
 200 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 201 {
 202         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 203
 204         if (enable) {
 205                 const struct vimc_pix_map *vpix;
 206                 unsigned int frame_size;
 207
 208                 if (vsca->src_frame)
 209                         return 0;
 210
 211                 /* Save the bytes per pixel of the sink */
 212                 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
 213                 vsca->bpp = vpix->bpp;
 214
 215                 /* Calculate the width in bytes of the src frame */
 216                 vsca->src_line_size = vsca->sink_fmt.width *
 217                                       sca_mult * vsca->bpp;
 218
 219                 /* Calculate the frame size of the source pad */
 220                 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
 221                              sca_mult;
 222
 223                 /* Allocate the frame buffer. Use vmalloc to be able to
 224                  * allocate a large amount of memory
 225                  */
 226                 vsca->src_frame = vmalloc(frame_size);
 227                 if (!vsca->src_frame)
 228                         return -ENOMEM;
 229
 230         } else {
 231                 if (!vsca->src_frame)
 232                         return 0;
 233
 234                 vfree(vsca->src_frame);
 235                 vsca->src_frame = NULL;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 242         .s_stream = vimc_sca_s_stream,
 243 };
 244
 245 static const struct v4l2_subdev_ops vimc_sca_ops = {
 246         .pad = &vimc_sca_pad_ops,
 247         .video = &vimc_sca_video_ops,
 248 };
 249
 250 static void vimc_sca_fill_pix(u8 *const ptr,
 251                               const u8 *const pixel,
 252                               const unsigned int bpp)
 253 {
 254         unsigned int i;
 255
 256         /* copy the pixel to the pointer */
 257         for (i = 0; i < bpp; i++)
 258                 ptr[i] = pixel[i];
 259 }
 260
 261 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 262                                const unsigned int lin, const unsigned int col,
 263                                const u8 *const sink_frame)
 264 {
 265         unsigned int i, j, index;
 266         const u8 *pixel;
 267
 268         /* Point to the pixel value in position (lin, col) in the sink frame */
 269         index = VIMC_FRAME_INDEX(lin, col,
 270                                  vsca->sink_fmt.width,
 271                                  vsca->bpp);
 272         pixel = &sink_frame[index];
 273
 274         dev_dbg(vsca->dev,
 275                 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
 276                 vsca->sd.name, lin, col, index);
 277
 278         /* point to the place we are going to put the first pixel
 279          * in the scaled src frame
 280          */
 281         index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
 282                                  vsca->sink_fmt.width * sca_mult, vsca->bpp);
 283
 284         dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 285                 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
 286
 287         /* Repeat this pixel mult times */
 288         for (i = 0; i < sca_mult; i++) {
 289                 /* Iterate through each beginning of a
 290                  * pixel repetition in a line
 291                  */
 292                 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
 293                         dev_dbg(vsca->dev,
 294                                 "sca: %s: sca: scale_pix src pos %d\n",
 295                                 vsca->sd.name, index + j);
 296
 297                         /* copy the pixel to the position index + j */
 298                         vimc_sca_fill_pix(&vsca->src_frame[index + j],
 299                                           pixel, vsca->bpp);
 300                 }
 301
 302                 /* move the index to the next line */
 303                 index += vsca->src_line_size;
 304         }
 305 }
 306
 307 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
 308                                     const u8 *const sink_frame)
 309 {
 310         unsigned int i, j;
 311
 312         /* Scale each pixel from the original sink frame */
 313         /* TODO: implement scale down, only scale up is supported for now */
 314         for (i = 0; i < vsca->sink_fmt.height; i++)
 315                 for (j = 0; j < vsca->sink_fmt.width; j++)
 316                         vimc_sca_scale_pix(vsca, i, j, sink_frame);
 317 }
 318
 319 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
 320                                     const void *sink_frame)
 321 {
 322         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 323                                                     ved);
 324
 325         /* If the stream in this node is not active, just return */
 326         if (!vsca->src_frame)
 327                 return ERR_PTR(-EINVAL);
 328
 329         vimc_sca_fill_src_frame(vsca, sink_frame);
 330
 331         return vsca->src_frame;
 332 };
 333
 334 static void vimc_sca_release(struct v4l2_subdev *sd)
 335 {
 336         struct vimc_sca_device *vsca =
 337                                 container_of(sd, struct vimc_sca_device, sd);
 338
 339         vimc_pads_cleanup(vsca->ved.pads);
 340         kfree(vsca);
 341 }
 342
 343 static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
 344         .release = vimc_sca_release,
 345 };
 346
 347 void vimc_sca_rm(struct vimc_device *vimc, struct vimc_ent_device *ved)
 348 {
 349         struct vimc_sca_device *vsca;
 350
 351         vsca = container_of(ved, struct vimc_sca_device, ved);
 352         vimc_ent_sd_unregister(ved, &vsca->sd);
 353 }
 354
 355 struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
 356                                      const char *vcfg_name)
 357 {
 358         struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
 359         struct vimc_sca_device *vsca;
 360         int ret;
 361
 362         /* Allocate the vsca struct */
 363         vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
 364         if (!vsca)
 365                 return NULL;
 366
 367         /* Initialize ved and sd */
 368         ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
 369                                    vcfg_name,
 370                                    MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
 371                                    (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
 372                                    MEDIA_PAD_FL_SOURCE},
 373                                    &vimc_sca_int_ops, &vimc_sca_ops);
 374         if (ret) {
 375                 kfree(vsca);
 376                 return NULL;
 377         }
 378
 379         vsca->ved.process_frame = vimc_sca_process_frame;
 380         vsca->dev = &vimc->pdev.dev;
 381
 382         /* Initialize the frame format */
 383         vsca->sink_fmt = sink_fmt_default;
 384
 385         return &vsca->ved;
 386 }