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-rect.h>
  12 #include <media/v4l2-subdev.h>
  13
  14 #include "vimc-common.h"
  15
  16 static unsigned int sca_mult = 3;
  17 module_param(sca_mult, uint, 0000);
  18 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
  19
  20 #define MAX_ZOOM        8
  21
  22 #define VIMC_SCA_FMT_WIDTH_DEFAULT  640
  23 #define VIMC_SCA_FMT_HEIGHT_DEFAULT 480
  24
  25 struct vimc_sca_device {
  26         struct vimc_ent_device ved;
  27         struct v4l2_subdev sd;
  28         /* NOTE: the source fmt is the same as the sink
  29          * with the width and hight multiplied by mult
  30          */
  31         struct v4l2_mbus_framefmt sink_fmt;
  32         struct v4l2_rect crop_rect;
  33         /* Values calculated when the stream starts */
  34         u8 *src_frame;
  35         unsigned int src_line_size;
  36         unsigned int bpp;
  37         struct media_pad pads[2];
  38 };
  39
  40 static const struct v4l2_mbus_framefmt sink_fmt_default = {
  41         .width = VIMC_SCA_FMT_WIDTH_DEFAULT,
  42         .height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
  43         .code = MEDIA_BUS_FMT_RGB888_1X24,
  44         .field = V4L2_FIELD_NONE,
  45         .colorspace = V4L2_COLORSPACE_DEFAULT,
  46 };
  47
  48 static const struct v4l2_rect crop_rect_default = {
  49         .width = VIMC_SCA_FMT_WIDTH_DEFAULT,
  50         .height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
  51         .top = 0,
  52         .left = 0,
  53 };
  54
  55 static const struct v4l2_rect crop_rect_min = {
  56         .width = VIMC_FRAME_MIN_WIDTH,
  57         .height = VIMC_FRAME_MIN_HEIGHT,
  58         .top = 0,
  59         .left = 0,
  60 };
  61
  62 static struct v4l2_rect
  63 vimc_sca_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt)
  64 {
  65         /* Get the crop bounds to clamp the crop rectangle correctly */
  66         struct v4l2_rect r = {
  67                 .left = 0,
  68                 .top = 0,
  69                 .width = sink_fmt->width,
  70                 .height = sink_fmt->height,
  71         };
  72         return r;
  73 }
  74
  75 static void vimc_sca_adjust_sink_crop(struct v4l2_rect *r,
  76                                       const struct v4l2_mbus_framefmt *sink_fmt)
  77 {
  78         const struct v4l2_rect sink_rect =
  79                 vimc_sca_get_crop_bound_sink(sink_fmt);
  80
  81         /* Disallow rectangles smaller than the minimal one. */
  82         v4l2_rect_set_min_size(r, &crop_rect_min);
  83         v4l2_rect_map_inside(r, &sink_rect);
  84 }
  85
  86 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
  87                              struct v4l2_subdev_pad_config *cfg)
  88 {
  89         struct v4l2_mbus_framefmt *mf;
  90         struct v4l2_rect *r;
  91         unsigned int i;
  92
  93         mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  94         *mf = sink_fmt_default;
  95
  96         r = v4l2_subdev_get_try_crop(sd, cfg, 0);
  97         *r = crop_rect_default;
  98
  99         for (i = 1; i < sd->entity.num_pads; i++) {
 100                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
 101                 *mf = sink_fmt_default;
 102                 mf->width = mf->width * sca_mult;
 103                 mf->height = mf->height * sca_mult;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
 110                                    struct v4l2_subdev_pad_config *cfg,
 111                                    struct v4l2_subdev_mbus_code_enum *code)
 112 {
 113         const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
 114
 115         /* We don't support bayer format */
 116         if (!vpix || vpix->bayer)
 117                 return -EINVAL;
 118
 119         code->code = vpix->code;
 120
 121         return 0;
 122 }
 123
 124 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
 125                                     struct v4l2_subdev_pad_config *cfg,
 126                                     struct v4l2_subdev_frame_size_enum *fse)
 127 {
 128         const struct vimc_pix_map *vpix;
 129
 130         if (fse->index)
 131                 return -EINVAL;
 132
 133         /* Only accept code in the pix map table in non bayer format */
 134         vpix = vimc_pix_map_by_code(fse->code);
 135         if (!vpix || vpix->bayer)
 136                 return -EINVAL;
 137
 138         fse->min_width = VIMC_FRAME_MIN_WIDTH;
 139         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
 140
 141         if (VIMC_IS_SINK(fse->pad)) {
 142                 fse->max_width = VIMC_FRAME_MAX_WIDTH;
 143                 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
 144         } else {
 145                 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
 146                 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
 153                             struct v4l2_subdev_pad_config *cfg,
 154                             struct v4l2_subdev_format *format)
 155 {
 156         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 157         struct v4l2_rect *crop_rect;
 158
 159         /* Get the current sink format */
 160         if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 161                 format->format = *v4l2_subdev_get_try_format(sd, cfg, 0);
 162                 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
 163         } else {
 164                 format->format = vsca->sink_fmt;
 165                 crop_rect = &vsca->crop_rect;
 166         }
 167
 168         /* Scale the frame size for the source pad */
 169         if (VIMC_IS_SRC(format->pad)) {
 170                 format->format.width = crop_rect->width * sca_mult;
 171                 format->format.height = crop_rect->height * sca_mult;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
 178 {
 179         const struct vimc_pix_map *vpix;
 180
 181         /* Only accept code in the pix map table in non bayer format */
 182         vpix = vimc_pix_map_by_code(fmt->code);
 183         if (!vpix || vpix->bayer)
 184                 fmt->code = sink_fmt_default.code;
 185
 186         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 187                              VIMC_FRAME_MAX_WIDTH) & ~1;
 188         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 189                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 190
 191         if (fmt->field == V4L2_FIELD_ANY)
 192                 fmt->field = sink_fmt_default.field;
 193
 194         vimc_colorimetry_clamp(fmt);
 195 }
 196
 197 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
 198                             struct v4l2_subdev_pad_config *cfg,
 199                             struct v4l2_subdev_format *fmt)
 200 {
 201         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 202         struct v4l2_mbus_framefmt *sink_fmt;
 203         struct v4l2_rect *crop_rect;
 204
 205         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 206                 /* Do not change the format while stream is on */
 207                 if (vsca->src_frame)
 208                         return -EBUSY;
 209
 210                 sink_fmt = &vsca->sink_fmt;
 211                 crop_rect = &vsca->crop_rect;
 212         } else {
 213                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 214                 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
 215         }
 216
 217         /*
 218          * Do not change the format of the source pad,
 219          * it is propagated from the sink
 220          */
 221         if (VIMC_IS_SRC(fmt->pad)) {
 222                 fmt->format = *sink_fmt;
 223                 fmt->format.width = crop_rect->width * sca_mult;
 224                 fmt->format.height = crop_rect->height * sca_mult;
 225         } else {
 226                 /* Set the new format in the sink pad */
 227                 vimc_sca_adjust_sink_fmt(&fmt->format);
 228
 229                 dev_dbg(vsca->ved.dev, "%s: sink format update: "
 230                         "old:%dx%d (0x%x, %d, %d, %d, %d) "
 231                         "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
 232                         /* old */
 233                         sink_fmt->width, sink_fmt->height, sink_fmt->code,
 234                         sink_fmt->colorspace, sink_fmt->quantization,
 235                         sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
 236                         /* new */
 237                         fmt->format.width, fmt->format.height, fmt->format.code,
 238                         fmt->format.colorspace, fmt->format.quantization,
 239                         fmt->format.xfer_func, fmt->format.ycbcr_enc);
 240
 241                 *sink_fmt = fmt->format;
 242
 243                 /* Do the crop, but respect the current bounds */
 244                 vimc_sca_adjust_sink_crop(crop_rect, sink_fmt);
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int vimc_sca_get_selection(struct v4l2_subdev *sd,
 251                                   struct v4l2_subdev_pad_config *cfg,
 252                                   struct v4l2_subdev_selection *sel)
 253 {
 254         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 255         struct v4l2_mbus_framefmt *sink_fmt;
 256         struct v4l2_rect *crop_rect;
 257
 258         if (VIMC_IS_SRC(sel->pad))
 259                 return -EINVAL;
 260
 261         if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 262                 sink_fmt = &vsca->sink_fmt;
 263                 crop_rect = &vsca->crop_rect;
 264         } else {
 265                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 266                 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
 267         }
 268
 269         switch (sel->target) {
 270         case V4L2_SEL_TGT_CROP:
 271                 sel->r = *crop_rect;
 272                 break;
 273         case V4L2_SEL_TGT_CROP_BOUNDS:
 274                 sel->r = vimc_sca_get_crop_bound_sink(sink_fmt);
 275                 break;
 276         default:
 277                 return -EINVAL;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static int vimc_sca_set_selection(struct v4l2_subdev *sd,
 284                                   struct v4l2_subdev_pad_config *cfg,
 285                                   struct v4l2_subdev_selection *sel)
 286 {
 287         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 288         struct v4l2_mbus_framefmt *sink_fmt;
 289         struct v4l2_rect *crop_rect;
 290
 291         if (VIMC_IS_SRC(sel->pad))
 292                 return -EINVAL;
 293
 294         if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 295                 /* Do not change the format while stream is on */
 296                 if (vsca->src_frame)
 297                         return -EBUSY;
 298
 299                 crop_rect = &vsca->crop_rect;
 300                 sink_fmt = &vsca->sink_fmt;
 301         } else {
 302                 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
 303                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 304         }
 305
 306         switch (sel->target) {
 307         case V4L2_SEL_TGT_CROP:
 308                 /* Do the crop, but respect the current bounds */
 309                 vimc_sca_adjust_sink_crop(&sel->r, sink_fmt);
 310                 *crop_rect = sel->r;
 311                 break;
 312         default:
 313                 return -EINVAL;
 314         }
 315
 316         return 0;
 317 }
 318
 319 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 320         .init_cfg               = vimc_sca_init_cfg,
 321         .enum_mbus_code         = vimc_sca_enum_mbus_code,
 322         .enum_frame_size        = vimc_sca_enum_frame_size,
 323         .get_fmt                = vimc_sca_get_fmt,
 324         .set_fmt                = vimc_sca_set_fmt,
 325         .get_selection          = vimc_sca_get_selection,
 326         .set_selection          = vimc_sca_set_selection,
 327 };
 328
 329 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 330 {
 331         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 332
 333         if (enable) {
 334                 const struct vimc_pix_map *vpix;
 335                 unsigned int frame_size;
 336
 337                 if (vsca->src_frame)
 338                         return 0;
 339
 340                 /* Save the bytes per pixel of the sink */
 341                 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
 342                 vsca->bpp = vpix->bpp;
 343
 344                 /* Calculate the width in bytes of the src frame */
 345                 vsca->src_line_size = vsca->crop_rect.width *
 346                                       sca_mult * vsca->bpp;
 347
 348                 /* Calculate the frame size of the source pad */
 349                 frame_size = vsca->src_line_size * vsca->crop_rect.height *
 350                              sca_mult;
 351
 352                 /* Allocate the frame buffer. Use vmalloc to be able to
 353                  * allocate a large amount of memory
 354                  */
 355                 vsca->src_frame = vmalloc(frame_size);
 356                 if (!vsca->src_frame)
 357                         return -ENOMEM;
 358
 359         } else {
 360                 if (!vsca->src_frame)
 361                         return 0;
 362
 363                 vfree(vsca->src_frame);
 364                 vsca->src_frame = NULL;
 365         }
 366
 367         return 0;
 368 }
 369
 370 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 371         .s_stream = vimc_sca_s_stream,
 372 };
 373
 374 static const struct v4l2_subdev_ops vimc_sca_ops = {
 375         .pad = &vimc_sca_pad_ops,
 376         .video = &vimc_sca_video_ops,
 377 };
 378
 379 static void vimc_sca_fill_pix(u8 *const ptr,
 380                               const u8 *const pixel,
 381                               const unsigned int bpp)
 382 {
 383         unsigned int i;
 384
 385         /* copy the pixel to the pointer */
 386         for (i = 0; i < bpp; i++)
 387                 ptr[i] = pixel[i];
 388 }
 389
 390 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 391                                unsigned int lin, unsigned int col,
 392                                const u8 *const sink_frame)
 393 {
 394         const struct v4l2_rect crop_rect = vsca->crop_rect;
 395         unsigned int i, j, index;
 396         const u8 *pixel;
 397
 398         /* Point to the pixel value in position (lin, col) in the sink frame */
 399         index = VIMC_FRAME_INDEX(lin, col,
 400                                  vsca->sink_fmt.width,
 401                                  vsca->bpp);
 402         pixel = &sink_frame[index];
 403
 404         dev_dbg(vsca->ved.dev,
 405                 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
 406                 vsca->sd.name, lin, col, index);
 407
 408         /* point to the place we are going to put the first pixel
 409          * in the scaled src frame
 410          */
 411         lin -= crop_rect.top;
 412         col -= crop_rect.left;
 413         index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
 414                                  crop_rect.width * sca_mult, vsca->bpp);
 415
 416         dev_dbg(vsca->ved.dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 417                 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
 418
 419         /* Repeat this pixel mult times */
 420         for (i = 0; i < sca_mult; i++) {
 421                 /* Iterate through each beginning of a
 422                  * pixel repetition in a line
 423                  */
 424                 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
 425                         dev_dbg(vsca->ved.dev,
 426                                 "sca: %s: sca: scale_pix src pos %d\n",
 427                                 vsca->sd.name, index + j);
 428
 429                         /* copy the pixel to the position index + j */
 430                         vimc_sca_fill_pix(&vsca->src_frame[index + j],
 431                                           pixel, vsca->bpp);
 432                 }
 433
 434                 /* move the index to the next line */
 435                 index += vsca->src_line_size;
 436         }
 437 }
 438
 439 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
 440                                     const u8 *const sink_frame)
 441 {
 442         const struct v4l2_rect r = vsca->crop_rect;
 443         unsigned int i, j;
 444
 445         /* Scale each pixel from the original sink frame */
 446         /* TODO: implement scale down, only scale up is supported for now */
 447         for (i = r.top; i < r.top + r.height; i++)
 448                 for (j = r.left; j < r.left + r.width; j++)
 449                         vimc_sca_scale_pix(vsca, i, j, sink_frame);
 450 }
 451
 452 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
 453                                     const void *sink_frame)
 454 {
 455         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 456                                                     ved);
 457
 458         /* If the stream in this node is not active, just return */
 459         if (!vsca->src_frame)
 460                 return ERR_PTR(-EINVAL);
 461
 462         vimc_sca_fill_src_frame(vsca, sink_frame);
 463
 464         return vsca->src_frame;
 465 };
 466
 467 void vimc_sca_release(struct vimc_ent_device *ved)
 468 {
 469         struct vimc_sca_device *vsca =
 470                 container_of(ved, struct vimc_sca_device, ved);
 471
 472         media_entity_cleanup(vsca->ved.ent);
 473         kfree(vsca);
 474 }
 475
 476 struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
 477                                      const char *vcfg_name)
 478 {
 479         struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
 480         struct vimc_sca_device *vsca;
 481         int ret;
 482
 483         /* Allocate the vsca struct */
 484         vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
 485         if (!vsca)
 486                 return NULL;
 487
 488         /* Initialize ved and sd */
 489         vsca->pads[0].flags = MEDIA_PAD_FL_SINK;
 490         vsca->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 491
 492         ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
 493                                    vcfg_name,
 494                                    MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
 495                                    vsca->pads, &vimc_sca_ops);
 496         if (ret) {
 497                 kfree(vsca);
 498                 return NULL;
 499         }
 500
 501         vsca->ved.process_frame = vimc_sca_process_frame;
 502         vsca->ved.dev = vimc->mdev.dev;
 503
 504         /* Initialize the frame format */
 505         vsca->sink_fmt = sink_fmt_default;
 506
 507         /* Initialize the crop selection */
 508         vsca->crop_rect = crop_rect_default;
 509
 510         return &vsca->ved;
 511 }