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/component.h>
   9 #include <linux/module.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/vmalloc.h>
  13 #include <linux/v4l2-mediabus.h>
  14 #include <media/v4l2-subdev.h>
  15
  16 #include "vimc-common.h"
  17
  18 #define VIMC_SCA_DRV_NAME "vimc-scaler"
  19
  20 static unsigned int sca_mult = 3;
  21 module_param(sca_mult, uint, 0000);
  22 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
  23
  24 #define IS_SINK(pad)    (!pad)
  25 #define IS_SRC(pad)     (pad)
  26 #define MAX_ZOOM        8
  27
  28 static const u32 vimc_sca_supported_pixfmt[] = {
  29         V4L2_PIX_FMT_BGR24,
  30         V4L2_PIX_FMT_RGB24,
  31         V4L2_PIX_FMT_ARGB32,
  32 };
  33
  34 struct vimc_sca_device {
  35         struct vimc_ent_device ved;
  36         struct v4l2_subdev sd;
  37         struct device *dev;
  38         /* NOTE: the source fmt is the same as the sink
  39          * with the width and hight multiplied by mult
  40          */
  41         struct v4l2_mbus_framefmt sink_fmt;
  42         /* Values calculated when the stream starts */
  43         u8 *src_frame;
  44         unsigned int src_line_size;
  45         unsigned int bpp;
  46 };
  47
  48 static const struct v4l2_mbus_framefmt sink_fmt_default = {
  49         .width = 640,
  50         .height = 480,
  51         .code = MEDIA_BUS_FMT_RGB888_1X24,
  52         .field = V4L2_FIELD_NONE,
  53         .colorspace = V4L2_COLORSPACE_DEFAULT,
  54 };
  55
  56 static bool vimc_sca_is_pixfmt_supported(u32 pixelformat)
  57 {
  58         unsigned int i;
  59
  60         for (i = 0; i < ARRAY_SIZE(vimc_sca_supported_pixfmt); i++)
  61                 if (vimc_sca_supported_pixfmt[i] == pixelformat)
  62                         return true;
  63         return false;
  64 }
  65
  66 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
  67                              struct v4l2_subdev_pad_config *cfg)
  68 {
  69         struct v4l2_mbus_framefmt *mf;
  70         unsigned int i;
  71
  72         mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  73         *mf = sink_fmt_default;
  74
  75         for (i = 1; i < sd->entity.num_pads; i++) {
  76                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
  77                 *mf = sink_fmt_default;
  78                 mf->width = mf->width * sca_mult;
  79                 mf->height = mf->height * sca_mult;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
  86                                     struct v4l2_subdev_pad_config *cfg,
  87                                     struct v4l2_subdev_frame_size_enum *fse)
  88 {
  89         if (fse->index)
  90                 return -EINVAL;
  91
  92         fse->min_width = VIMC_FRAME_MIN_WIDTH;
  93         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
  94
  95         if (IS_SINK(fse->pad)) {
  96                 fse->max_width = VIMC_FRAME_MAX_WIDTH;
  97                 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
  98         } else {
  99                 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
 100                 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
 107                             struct v4l2_subdev_pad_config *cfg,
 108                             struct v4l2_subdev_format *format)
 109 {
 110         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 111
 112         /* Get the current sink format */
 113         format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
 114                          *v4l2_subdev_get_try_format(sd, cfg, 0) :
 115                          vsca->sink_fmt;
 116
 117         /* Scale the frame size for the source pad */
 118         if (IS_SRC(format->pad)) {
 119                 format->format.width = vsca->sink_fmt.width * sca_mult;
 120                 format->format.height = vsca->sink_fmt.height * sca_mult;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
 127 {
 128         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 129                              VIMC_FRAME_MAX_WIDTH) & ~1;
 130         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 131                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 132
 133         if (fmt->field == V4L2_FIELD_ANY)
 134                 fmt->field = sink_fmt_default.field;
 135
 136         vimc_colorimetry_clamp(fmt);
 137 }
 138
 139 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
 140                             struct v4l2_subdev_pad_config *cfg,
 141                             struct v4l2_subdev_format *fmt)
 142 {
 143         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 144         struct v4l2_mbus_framefmt *sink_fmt;
 145
 146         if (!vimc_mbus_code_supported(fmt->format.code))
 147                 fmt->format.code = sink_fmt_default.code;
 148
 149         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 150                 /* Do not change the format while stream is on */
 151                 if (vsca->ved.stream)
 152                         return -EBUSY;
 153
 154                 sink_fmt = &vsca->sink_fmt;
 155         } else {
 156                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 157         }
 158
 159         /*
 160          * Do not change the format of the source pad,
 161          * it is propagated from the sink
 162          */
 163         if (IS_SRC(fmt->pad)) {
 164                 fmt->format = *sink_fmt;
 165                 fmt->format.width = sink_fmt->width * sca_mult;
 166                 fmt->format.height = sink_fmt->height * sca_mult;
 167         } else {
 168                 /* Set the new format in the sink pad */
 169                 vimc_sca_adjust_sink_fmt(&fmt->format);
 170
 171                 dev_dbg(vsca->dev, "%s: sink format update: "
 172                         "old:%dx%d (0x%x, %d, %d, %d, %d) "
 173                         "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
 174                         /* old */
 175                         sink_fmt->width, sink_fmt->height, sink_fmt->code,
 176                         sink_fmt->colorspace, sink_fmt->quantization,
 177                         sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
 178                         /* new */
 179                         fmt->format.width, fmt->format.height, fmt->format.code,
 180                         fmt->format.colorspace, fmt->format.quantization,
 181                         fmt->format.xfer_func, fmt->format.ycbcr_enc);
 182
 183                 *sink_fmt = fmt->format;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 190         .init_cfg               = vimc_sca_init_cfg,
 191         .enum_mbus_code         = vimc_enum_mbus_code,
 192         .enum_frame_size        = vimc_sca_enum_frame_size,
 193         .get_fmt                = vimc_sca_get_fmt,
 194         .set_fmt                = vimc_sca_set_fmt,
 195 };
 196
 197 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 198 {
 199         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 200
 201         if (enable) {
 202                 u32 pixelformat = vsca->ved.stream->producer_pixfmt;
 203                 const struct v4l2_format_info *pix_info;
 204                 unsigned int frame_size;
 205
 206                 if (!vimc_sca_is_pixfmt_supported(pixelformat)) {
 207                         dev_err(vsca->dev, "pixfmt (0x%08x) is not supported\n",
 208                                 pixelformat);
 209                         return -EINVAL;
 210                 }
 211
 212                 /* Save the bytes per pixel of the sink */
 213                 pix_info = v4l2_format_info(pixelformat);
 214                 vsca->bpp = pix_info->bpp[0];
 215
 216                 /* Calculate the width in bytes of the src frame */
 217                 vsca->src_line_size = vsca->sink_fmt.width *
 218                                       sca_mult * vsca->bpp;
 219
 220                 /* Calculate the frame size of the source pad */
 221                 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
 222                              sca_mult;
 223
 224                 /* Allocate the frame buffer. Use vmalloc to be able to
 225                  * allocate a large amount of memory
 226                  */
 227                 vsca->src_frame = vmalloc(frame_size);
 228                 if (!vsca->src_frame)
 229                         return -ENOMEM;
 230
 231         } else {
 232                 if (!vsca->src_frame)
 233                         return 0;
 234
 235                 vfree(vsca->src_frame);
 236                 vsca->src_frame = NULL;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 243         .s_stream = vimc_sca_s_stream,
 244 };
 245
 246 static const struct v4l2_subdev_ops vimc_sca_ops = {
 247         .pad = &vimc_sca_pad_ops,
 248         .video = &vimc_sca_video_ops,
 249 };
 250
 251 static void vimc_sca_fill_pix(u8 *const ptr,
 252                               const u8 *const pixel,
 253                               const unsigned int bpp)
 254 {
 255         unsigned int i;
 256
 257         /* copy the pixel to the pointer */
 258         for (i = 0; i < bpp; i++)
 259                 ptr[i] = pixel[i];
 260 }
 261
 262 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 263                                const unsigned int lin, const unsigned int col,
 264                                const u8 *const sink_frame)
 265 {
 266         unsigned int i, j, index;
 267         const u8 *pixel;
 268
 269         /* Point to the pixel value in position (lin, col) in the sink frame */
 270         index = VIMC_FRAME_INDEX(lin, col,
 271                                  vsca->sink_fmt.width,
 272                                  vsca->bpp);
 273         pixel = &sink_frame[index];
 274
 275         dev_dbg(vsca->dev,
 276                 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
 277                 vsca->sd.name, lin, col, index);
 278
 279         /* point to the place we are going to put the first pixel
 280          * in the scaled src frame
 281          */
 282         index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
 283                                  vsca->sink_fmt.width * sca_mult, vsca->bpp);
 284
 285         dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 286                 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
 287
 288         /* Repeat this pixel mult times */
 289         for (i = 0; i < sca_mult; i++) {
 290                 /* Iterate through each beginning of a
 291                  * pixel repetition in a line
 292                  */
 293                 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
 294                         dev_dbg(vsca->dev,
 295                                 "sca: %s: sca: scale_pix src pos %d\n",
 296                                 vsca->sd.name, index + j);
 297
 298                         /* copy the pixel to the position index + j */
 299                         vimc_sca_fill_pix(&vsca->src_frame[index + j],
 300                                           pixel, vsca->bpp);
 301                 }
 302
 303                 /* move the index to the next line */
 304                 index += vsca->src_line_size;
 305         }
 306 }
 307
 308 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
 309                                     const u8 *const sink_frame)
 310 {
 311         unsigned int i, j;
 312
 313         /* Scale each pixel from the original sink frame */
 314         /* TODO: implement scale down, only scale up is supported for now */
 315         for (i = 0; i < vsca->sink_fmt.height; i++)
 316                 for (j = 0; j < vsca->sink_fmt.width; j++)
 317                         vimc_sca_scale_pix(vsca, i, j, sink_frame);
 318 }
 319
 320 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
 321                                     const void *sink_frame)
 322 {
 323         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 324                                                     ved);
 325
 326         /* If the stream in this node is not active, just return */
 327         if (!ved->stream)
 328                 return ERR_PTR(-EINVAL);
 329
 330         vimc_sca_fill_src_frame(vsca, sink_frame);
 331
 332         return vsca->src_frame;
 333 };
 334
 335 static void vimc_sca_release(struct v4l2_subdev *sd)
 336 {
 337         struct vimc_sca_device *vsca =
 338                                 container_of(sd, struct vimc_sca_device, sd);
 339
 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 static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
 348                                  void *master_data)
 349 {
 350         struct vimc_ent_device *ved = dev_get_drvdata(comp);
 351         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 352                                                     ved);
 353
 354         vimc_ent_sd_unregister(ved, &vsca->sd);
 355 }
 356
 357
 358 static int vimc_sca_comp_bind(struct device *comp, struct device *master,
 359                               void *master_data)
 360 {
 361         struct v4l2_device *v4l2_dev = master_data;
 362         struct vimc_platform_data *pdata = comp->platform_data;
 363         struct vimc_sca_device *vsca;
 364         int ret;
 365
 366         /* Allocate the vsca struct */
 367         vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
 368         if (!vsca)
 369                 return -ENOMEM;
 370
 371         /* Initialize ved and sd */
 372         ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
 373                                    pdata->entity_name,
 374                                    MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
 375                                    (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
 376                                    MEDIA_PAD_FL_SOURCE},
 377                                    &vimc_sca_int_ops, &vimc_sca_ops);
 378         if (ret) {
 379                 kfree(vsca);
 380                 return ret;
 381         }
 382
 383         vsca->ved.process_frame = vimc_sca_process_frame;
 384         dev_set_drvdata(comp, &vsca->ved);
 385         vsca->dev = comp;
 386
 387         /* Initialize the frame format */
 388         vsca->sink_fmt = sink_fmt_default;
 389
 390         return 0;
 391 }
 392
 393 static const struct component_ops vimc_sca_comp_ops = {
 394         .bind = vimc_sca_comp_bind,
 395         .unbind = vimc_sca_comp_unbind,
 396 };
 397
 398 static int vimc_sca_probe(struct platform_device *pdev)
 399 {
 400         return component_add(&pdev->dev, &vimc_sca_comp_ops);
 401 }
 402
 403 static int vimc_sca_remove(struct platform_device *pdev)
 404 {
 405         component_del(&pdev->dev, &vimc_sca_comp_ops);
 406
 407         return 0;
 408 }
 409
 410 static const struct platform_device_id vimc_sca_driver_ids[] = {
 411         {
 412                 .name           = VIMC_SCA_DRV_NAME,
 413         },
 414         { }
 415 };
 416
 417 static struct platform_driver vimc_sca_pdrv = {
 418         .probe          = vimc_sca_probe,
 419         .remove         = vimc_sca_remove,
 420         .id_table       = vimc_sca_driver_ids,
 421         .driver         = {
 422                 .name   = VIMC_SCA_DRV_NAME,
 423         },
 424 };
 425
 426 module_platform_driver(vimc_sca_pdrv);
 427
 428 MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
 429
 430 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
 431 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
 432 MODULE_LICENSE("GPL");