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

   1 /*
   2  * vimc-scaler.c Virtual Media Controller Driver
   3  *
   4  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/component.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/v4l2-mediabus.h>
  23 #include <media/v4l2-subdev.h>
  24
  25 #include "vimc-common.h"
  26
  27 #define VIMC_SCA_DRV_NAME "vimc-scaler"
  28
  29 static unsigned int sca_mult = 3;
  30 module_param(sca_mult, uint, 0000);
  31 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
  32
  33 #define IS_SINK(pad)    (!pad)
  34 #define IS_SRC(pad)     (pad)
  35 #define MAX_ZOOM        8
  36
  37 struct vimc_sca_device {
  38         struct vimc_ent_device ved;
  39         struct v4l2_subdev sd;
  40         struct device *dev;
  41         /* NOTE: the source fmt is the same as the sink
  42          * with the width and hight multiplied by mult
  43          */
  44         struct v4l2_mbus_framefmt sink_fmt;
  45         /* Values calculated when the stream starts */
  46         u8 *src_frame;
  47         unsigned int src_line_size;
  48         unsigned int bpp;
  49 };
  50
  51 static const struct v4l2_mbus_framefmt sink_fmt_default = {
  52         .width = 640,
  53         .height = 480,
  54         .code = MEDIA_BUS_FMT_RGB888_1X24,
  55         .field = V4L2_FIELD_NONE,
  56         .colorspace = V4L2_COLORSPACE_DEFAULT,
  57 };
  58
  59 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
  60                              struct v4l2_subdev_pad_config *cfg)
  61 {
  62         struct v4l2_mbus_framefmt *mf;
  63         unsigned int i;
  64
  65         mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  66         *mf = sink_fmt_default;
  67
  68         for (i = 1; i < sd->entity.num_pads; i++) {
  69                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
  70                 *mf = sink_fmt_default;
  71                 mf->width = mf->width * sca_mult;
  72                 mf->height = mf->height * sca_mult;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
  79                                    struct v4l2_subdev_pad_config *cfg,
  80                                    struct v4l2_subdev_mbus_code_enum *code)
  81 {
  82         const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
  83
  84         /* We don't support bayer format */
  85         if (!vpix || vpix->bayer)
  86                 return -EINVAL;
  87
  88         code->code = vpix->code;
  89
  90         return 0;
  91 }
  92
  93 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
  94                                     struct v4l2_subdev_pad_config *cfg,
  95                                     struct v4l2_subdev_frame_size_enum *fse)
  96 {
  97         const struct vimc_pix_map *vpix;
  98
  99         if (fse->index)
 100                 return -EINVAL;
 101
 102         /* Only accept code in the pix map table in non bayer format */
 103         vpix = vimc_pix_map_by_code(fse->code);
 104         if (!vpix || vpix->bayer)
 105                 return -EINVAL;
 106
 107         fse->min_width = VIMC_FRAME_MIN_WIDTH;
 108         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
 109
 110         if (IS_SINK(fse->pad)) {
 111                 fse->max_width = VIMC_FRAME_MAX_WIDTH;
 112                 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
 113         } else {
 114                 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
 115                 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
 122                             struct v4l2_subdev_pad_config *cfg,
 123                             struct v4l2_subdev_format *format)
 124 {
 125         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 126
 127         /* Get the current sink format */
 128         format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
 129                          *v4l2_subdev_get_try_format(sd, cfg, 0) :
 130                          vsca->sink_fmt;
 131
 132         /* Scale the frame size for the source pad */
 133         if (IS_SRC(format->pad)) {
 134                 format->format.width = vsca->sink_fmt.width * sca_mult;
 135                 format->format.height = vsca->sink_fmt.height * sca_mult;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
 142 {
 143         const struct vimc_pix_map *vpix;
 144
 145         /* Only accept code in the pix map table in non bayer format */
 146         vpix = vimc_pix_map_by_code(fmt->code);
 147         if (!vpix || vpix->bayer)
 148                 fmt->code = sink_fmt_default.code;
 149
 150         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 151                              VIMC_FRAME_MAX_WIDTH) & ~1;
 152         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 153                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 154
 155         if (fmt->field == V4L2_FIELD_ANY)
 156                 fmt->field = sink_fmt_default.field;
 157
 158         vimc_colorimetry_clamp(fmt);
 159 }
 160
 161 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
 162                             struct v4l2_subdev_pad_config *cfg,
 163                             struct v4l2_subdev_format *fmt)
 164 {
 165         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 166         struct v4l2_mbus_framefmt *sink_fmt;
 167
 168         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 169                 /* Do not change the format while stream is on */
 170                 if (vsca->src_frame)
 171                         return -EBUSY;
 172
 173                 sink_fmt = &vsca->sink_fmt;
 174         } else {
 175                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 176         }
 177
 178         /*
 179          * Do not change the format of the source pad,
 180          * it is propagated from the sink
 181          */
 182         if (IS_SRC(fmt->pad)) {
 183                 fmt->format = *sink_fmt;
 184                 fmt->format.width = sink_fmt->width * sca_mult;
 185                 fmt->format.height = sink_fmt->height * sca_mult;
 186         } else {
 187                 /* Set the new format in the sink pad */
 188                 vimc_sca_adjust_sink_fmt(&fmt->format);
 189
 190                 dev_dbg(vsca->dev, "%s: sink format update: "
 191                         "old:%dx%d (0x%x, %d, %d, %d, %d) "
 192                         "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
 193                         /* old */
 194                         sink_fmt->width, sink_fmt->height, sink_fmt->code,
 195                         sink_fmt->colorspace, sink_fmt->quantization,
 196                         sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
 197                         /* new */
 198                         fmt->format.width, fmt->format.height, fmt->format.code,
 199                         fmt->format.colorspace, fmt->format.quantization,
 200                         fmt->format.xfer_func, fmt->format.ycbcr_enc);
 201
 202                 *sink_fmt = fmt->format;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 209         .init_cfg               = vimc_sca_init_cfg,
 210         .enum_mbus_code         = vimc_sca_enum_mbus_code,
 211         .enum_frame_size        = vimc_sca_enum_frame_size,
 212         .get_fmt                = vimc_sca_get_fmt,
 213         .set_fmt                = vimc_sca_set_fmt,
 214 };
 215
 216 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 217 {
 218         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 219
 220         if (enable) {
 221                 const struct vimc_pix_map *vpix;
 222                 unsigned int frame_size;
 223
 224                 if (vsca->src_frame)
 225                         return 0;
 226
 227                 /* Save the bytes per pixel of the sink */
 228                 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
 229                 vsca->bpp = vpix->bpp;
 230
 231                 /* Calculate the width in bytes of the src frame */
 232                 vsca->src_line_size = vsca->sink_fmt.width *
 233                                       sca_mult * vsca->bpp;
 234
 235                 /* Calculate the frame size of the source pad */
 236                 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
 237                              sca_mult;
 238
 239                 /* Allocate the frame buffer. Use vmalloc to be able to
 240                  * allocate a large amount of memory
 241                  */
 242                 vsca->src_frame = vmalloc(frame_size);
 243                 if (!vsca->src_frame)
 244                         return -ENOMEM;
 245
 246         } else {
 247                 if (!vsca->src_frame)
 248                         return 0;
 249
 250                 vfree(vsca->src_frame);
 251                 vsca->src_frame = NULL;
 252         }
 253
 254         return 0;
 255 }
 256
 257 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 258         .s_stream = vimc_sca_s_stream,
 259 };
 260
 261 static const struct v4l2_subdev_ops vimc_sca_ops = {
 262         .pad = &vimc_sca_pad_ops,
 263         .video = &vimc_sca_video_ops,
 264 };
 265
 266 static void vimc_sca_fill_pix(u8 *const ptr,
 267                               const u8 *const pixel,
 268                               const unsigned int bpp)
 269 {
 270         unsigned int i;
 271
 272         /* copy the pixel to the pointer */
 273         for (i = 0; i < bpp; i++)
 274                 ptr[i] = pixel[i];
 275 }
 276
 277 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 278                                const unsigned int lin, const unsigned int col,
 279                                const u8 *const sink_frame)
 280 {
 281         unsigned int i, j, index;
 282         const u8 *pixel;
 283
 284         /* Point to the pixel value in position (lin, col) in the sink frame */
 285         index = VIMC_FRAME_INDEX(lin, col,
 286                                  vsca->sink_fmt.width,
 287                                  vsca->bpp);
 288         pixel = &sink_frame[index];
 289
 290         dev_dbg(vsca->dev,
 291                 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
 292                 vsca->sd.name, lin, col, index);
 293
 294         /* point to the place we are going to put the first pixel
 295          * in the scaled src frame
 296          */
 297         index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
 298                                  vsca->sink_fmt.width * sca_mult, vsca->bpp);
 299
 300         dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 301                 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
 302
 303         /* Repeat this pixel mult times */
 304         for (i = 0; i < sca_mult; i++) {
 305                 /* Iterate through each beginning of a
 306                  * pixel repetition in a line
 307                  */
 308                 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
 309                         dev_dbg(vsca->dev,
 310                                 "sca: %s: sca: scale_pix src pos %d\n",
 311                                 vsca->sd.name, index + j);
 312
 313                         /* copy the pixel to the position index + j */
 314                         vimc_sca_fill_pix(&vsca->src_frame[index + j],
 315                                           pixel, vsca->bpp);
 316                 }
 317
 318                 /* move the index to the next line */
 319                 index += vsca->src_line_size;
 320         }
 321 }
 322
 323 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
 324                                     const u8 *const sink_frame)
 325 {
 326         unsigned int i, j;
 327
 328         /* Scale each pixel from the original sink frame */
 329         /* TODO: implement scale down, only scale up is supported for now */
 330         for (i = 0; i < vsca->sink_fmt.height; i++)
 331                 for (j = 0; j < vsca->sink_fmt.width; j++)
 332                         vimc_sca_scale_pix(vsca, i, j, sink_frame);
 333 }
 334
 335 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
 336                                     const void *sink_frame)
 337 {
 338         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 339                                                     ved);
 340
 341         /* If the stream in this node is not active, just return */
 342         if (!vsca->src_frame)
 343                 return ERR_PTR(-EINVAL);
 344
 345         vimc_sca_fill_src_frame(vsca, sink_frame);
 346
 347         return vsca->src_frame;
 348 };
 349
 350 static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
 351                                  void *master_data)
 352 {
 353         struct vimc_ent_device *ved = dev_get_drvdata(comp);
 354         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 355                                                     ved);
 356
 357         vimc_ent_sd_unregister(ved, &vsca->sd);
 358         kfree(vsca);
 359 }
 360
 361
 362 static int vimc_sca_comp_bind(struct device *comp, struct device *master,
 363                               void *master_data)
 364 {
 365         struct v4l2_device *v4l2_dev = master_data;
 366         struct vimc_platform_data *pdata = comp->platform_data;
 367         struct vimc_sca_device *vsca;
 368         int ret;
 369
 370         /* Allocate the vsca struct */
 371         vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
 372         if (!vsca)
 373                 return -ENOMEM;
 374
 375         /* Initialize ved and sd */
 376         ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
 377                                    pdata->entity_name,
 378                                    MEDIA_ENT_F_ATV_DECODER, 2,
 379                                    (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
 380                                    MEDIA_PAD_FL_SOURCE},
 381                                    &vimc_sca_ops);
 382         if (ret) {
 383                 kfree(vsca);
 384                 return ret;
 385         }
 386
 387         vsca->ved.process_frame = vimc_sca_process_frame;
 388         dev_set_drvdata(comp, &vsca->ved);
 389         vsca->dev = comp;
 390
 391         /* Initialize the frame format */
 392         vsca->sink_fmt = sink_fmt_default;
 393
 394         return 0;
 395 }
 396
 397 static const struct component_ops vimc_sca_comp_ops = {
 398         .bind = vimc_sca_comp_bind,
 399         .unbind = vimc_sca_comp_unbind,
 400 };
 401
 402 static int vimc_sca_probe(struct platform_device *pdev)
 403 {
 404         return component_add(&pdev->dev, &vimc_sca_comp_ops);
 405 }
 406
 407 static int vimc_sca_remove(struct platform_device *pdev)
 408 {
 409         component_del(&pdev->dev, &vimc_sca_comp_ops);
 410
 411         return 0;
 412 }
 413
 414 static const struct platform_device_id vimc_sca_driver_ids[] = {
 415         {
 416                 .name           = VIMC_SCA_DRV_NAME,
 417         },
 418         { }
 419 };
 420
 421 static struct platform_driver vimc_sca_pdrv = {
 422         .probe          = vimc_sca_probe,
 423         .remove         = vimc_sca_remove,
 424         .id_table       = vimc_sca_driver_ids,
 425         .driver         = {
 426                 .name   = VIMC_SCA_DRV_NAME,
 427         },
 428 };
 429
 430 module_platform_driver(vimc_sca_pdrv);
 431
 432 MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
 433
 434 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
 435 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
 436 MODULE_LICENSE("GPL");