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