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 static const u32 vimc_sca_supported_pixfmt[] = {
  39         V4L2_PIX_FMT_BGR24,
  40         V4L2_PIX_FMT_RGB24,
  41         V4L2_PIX_FMT_ARGB32,
  42 };
  43
  44 struct vimc_sca_device {
  45         struct vimc_ent_device ved;
  46         struct v4l2_subdev sd;
  47         struct device *dev;
  48         /* NOTE: the source fmt is the same as the sink
  49          * with the width and hight multiplied by mult
  50          */
  51         struct v4l2_mbus_framefmt sink_fmt;
  52         /* Values calculated when the stream starts */
  53         u8 *src_frame;
  54         unsigned int src_line_size;
  55         unsigned int bpp;
  56 };
  57
  58 static const struct v4l2_mbus_framefmt sink_fmt_default = {
  59         .width = 640,
  60         .height = 480,
  61         .code = MEDIA_BUS_FMT_RGB888_1X24,
  62         .field = V4L2_FIELD_NONE,
  63         .colorspace = V4L2_COLORSPACE_DEFAULT,
  64 };
  65
  66 static bool vimc_sca_is_pixfmt_supported(u32 pixelformat)
  67 {
  68         unsigned int i;
  69
  70         for (i = 0; i < ARRAY_SIZE(vimc_sca_supported_pixfmt); i++)
  71                 if (vimc_sca_supported_pixfmt[i] == pixelformat)
  72                         return true;
  73         return false;
  74 }
  75
  76 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
  77                              struct v4l2_subdev_pad_config *cfg)
  78 {
  79         struct v4l2_mbus_framefmt *mf;
  80         unsigned int i;
  81
  82         mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  83         *mf = sink_fmt_default;
  84
  85         for (i = 1; i < sd->entity.num_pads; i++) {
  86                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
  87                 *mf = sink_fmt_default;
  88                 mf->width = mf->width * sca_mult;
  89                 mf->height = mf->height * sca_mult;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
  96                                     struct v4l2_subdev_pad_config *cfg,
  97                                     struct v4l2_subdev_frame_size_enum *fse)
  98 {
  99         if (fse->index)
 100                 return -EINVAL;
 101
 102         fse->min_width = VIMC_FRAME_MIN_WIDTH;
 103         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
 104
 105         if (IS_SINK(fse->pad)) {
 106                 fse->max_width = VIMC_FRAME_MAX_WIDTH;
 107                 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
 108         } else {
 109                 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
 110                 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
 111         }
 112
 113         return 0;
 114 }
 115
 116 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
 117                             struct v4l2_subdev_pad_config *cfg,
 118                             struct v4l2_subdev_format *format)
 119 {
 120         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 121
 122         /* Get the current sink format */
 123         format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
 124                          *v4l2_subdev_get_try_format(sd, cfg, 0) :
 125                          vsca->sink_fmt;
 126
 127         /* Scale the frame size for the source pad */
 128         if (IS_SRC(format->pad)) {
 129                 format->format.width = vsca->sink_fmt.width * sca_mult;
 130                 format->format.height = vsca->sink_fmt.height * sca_mult;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
 137 {
 138         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 139                              VIMC_FRAME_MAX_WIDTH) & ~1;
 140         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 141                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 142
 143         if (fmt->field == V4L2_FIELD_ANY)
 144                 fmt->field = sink_fmt_default.field;
 145
 146         vimc_colorimetry_clamp(fmt);
 147 }
 148
 149 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
 150                             struct v4l2_subdev_pad_config *cfg,
 151                             struct v4l2_subdev_format *fmt)
 152 {
 153         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 154         struct v4l2_mbus_framefmt *sink_fmt;
 155
 156         if (!vimc_mbus_code_supported(fmt->format.code))
 157                 fmt->format.code = sink_fmt_default.code;
 158
 159         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 160                 /* Do not change the format while stream is on */
 161                 if (vsca->src_frame)
 162                         return -EBUSY;
 163
 164                 sink_fmt = &vsca->sink_fmt;
 165         } else {
 166                 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
 167         }
 168
 169         /*
 170          * Do not change the format of the source pad,
 171          * it is propagated from the sink
 172          */
 173         if (IS_SRC(fmt->pad)) {
 174                 fmt->format = *sink_fmt;
 175                 fmt->format.width = sink_fmt->width * sca_mult;
 176                 fmt->format.height = sink_fmt->height * sca_mult;
 177         } else {
 178                 /* Set the new format in the sink pad */
 179                 vimc_sca_adjust_sink_fmt(&fmt->format);
 180
 181                 dev_dbg(vsca->dev, "%s: sink format update: "
 182                         "old:%dx%d (0x%x, %d, %d, %d, %d) "
 183                         "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
 184                         /* old */
 185                         sink_fmt->width, sink_fmt->height, sink_fmt->code,
 186                         sink_fmt->colorspace, sink_fmt->quantization,
 187                         sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
 188                         /* new */
 189                         fmt->format.width, fmt->format.height, fmt->format.code,
 190                         fmt->format.colorspace, fmt->format.quantization,
 191                         fmt->format.xfer_func, fmt->format.ycbcr_enc);
 192
 193                 *sink_fmt = fmt->format;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 200         .init_cfg               = vimc_sca_init_cfg,
 201         .enum_mbus_code         = vimc_enum_mbus_code,
 202         .enum_frame_size        = vimc_sca_enum_frame_size,
 203         .get_fmt                = vimc_sca_get_fmt,
 204         .set_fmt                = vimc_sca_set_fmt,
 205 };
 206
 207 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 208 {
 209         struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
 210
 211         if (enable) {
 212                 u32 pixelformat = vsca->ved.stream->producer_pixfmt;
 213                 const struct v4l2_format_info *pix_info;
 214                 unsigned int frame_size;
 215
 216                 if (vsca->src_frame)
 217                         return 0;
 218
 219                 if (!vimc_sca_is_pixfmt_supported(pixelformat)) {
 220                         dev_err(vsca->dev, "pixfmt (0x%08x) is not supported\n",
 221                                 pixelformat);
 222                         return -EINVAL;
 223                 }
 224
 225                 /* Save the bytes per pixel of the sink */
 226                 pix_info = v4l2_format_info(pixelformat);
 227                 vsca->bpp = pix_info->bpp[0];
 228
 229                 /* Calculate the width in bytes of the src frame */
 230                 vsca->src_line_size = vsca->sink_fmt.width *
 231                                       sca_mult * vsca->bpp;
 232
 233                 /* Calculate the frame size of the source pad */
 234                 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
 235                              sca_mult;
 236
 237                 /* Allocate the frame buffer. Use vmalloc to be able to
 238                  * allocate a large amount of memory
 239                  */
 240                 vsca->src_frame = vmalloc(frame_size);
 241                 if (!vsca->src_frame)
 242                         return -ENOMEM;
 243
 244         } else {
 245                 if (!vsca->src_frame)
 246                         return 0;
 247
 248                 vfree(vsca->src_frame);
 249                 vsca->src_frame = NULL;
 250         }
 251
 252         return 0;
 253 }
 254
 255 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 256         .s_stream = vimc_sca_s_stream,
 257 };
 258
 259 static const struct v4l2_subdev_ops vimc_sca_ops = {
 260         .pad = &vimc_sca_pad_ops,
 261         .video = &vimc_sca_video_ops,
 262 };
 263
 264 static void vimc_sca_fill_pix(u8 *const ptr,
 265                               const u8 *const pixel,
 266                               const unsigned int bpp)
 267 {
 268         unsigned int i;
 269
 270         /* copy the pixel to the pointer */
 271         for (i = 0; i < bpp; i++)
 272                 ptr[i] = pixel[i];
 273 }
 274
 275 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 276                                const unsigned int lin, const unsigned int col,
 277                                const u8 *const sink_frame)
 278 {
 279         unsigned int i, j, index;
 280         const u8 *pixel;
 281
 282         /* Point to the pixel value in position (lin, col) in the sink frame */
 283         index = VIMC_FRAME_INDEX(lin, col,
 284                                  vsca->sink_fmt.width,
 285                                  vsca->bpp);
 286         pixel = &sink_frame[index];
 287
 288         dev_dbg(vsca->dev,
 289                 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
 290                 vsca->sd.name, lin, col, index);
 291
 292         /* point to the place we are going to put the first pixel
 293          * in the scaled src frame
 294          */
 295         index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
 296                                  vsca->sink_fmt.width * sca_mult, vsca->bpp);
 297
 298         dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 299                 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
 300
 301         /* Repeat this pixel mult times */
 302         for (i = 0; i < sca_mult; i++) {
 303                 /* Iterate through each beginning of a
 304                  * pixel repetition in a line
 305                  */
 306                 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
 307                         dev_dbg(vsca->dev,
 308                                 "sca: %s: sca: scale_pix src pos %d\n",
 309                                 vsca->sd.name, index + j);
 310
 311                         /* copy the pixel to the position index + j */
 312                         vimc_sca_fill_pix(&vsca->src_frame[index + j],
 313                                           pixel, vsca->bpp);
 314                 }
 315
 316                 /* move the index to the next line */
 317                 index += vsca->src_line_size;
 318         }
 319 }
 320
 321 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
 322                                     const u8 *const sink_frame)
 323 {
 324         unsigned int i, j;
 325
 326         /* Scale each pixel from the original sink frame */
 327         /* TODO: implement scale down, only scale up is supported for now */
 328         for (i = 0; i < vsca->sink_fmt.height; i++)
 329                 for (j = 0; j < vsca->sink_fmt.width; j++)
 330                         vimc_sca_scale_pix(vsca, i, j, sink_frame);
 331 }
 332
 333 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
 334                                     const void *sink_frame)
 335 {
 336         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 337                                                     ved);
 338
 339         /* If the stream in this node is not active, just return */
 340         if (!vsca->src_frame)
 341                 return ERR_PTR(-EINVAL);
 342
 343         vimc_sca_fill_src_frame(vsca, sink_frame);
 344
 345         return vsca->src_frame;
 346 };
 347
 348 static void vimc_sca_release(struct v4l2_subdev *sd)
 349 {
 350         struct vimc_sca_device *vsca =
 351                                 container_of(sd, struct vimc_sca_device, sd);
 352
 353         kfree(vsca);
 354 }
 355
 356 static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
 357         .release = vimc_sca_release,
 358 };
 359
 360 static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
 361                                  void *master_data)
 362 {
 363         struct vimc_ent_device *ved = dev_get_drvdata(comp);
 364         struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
 365                                                     ved);
 366
 367         vimc_ent_sd_unregister(ved, &vsca->sd);
 368 }
 369
 370
 371 static int vimc_sca_comp_bind(struct device *comp, struct device *master,
 372                               void *master_data)
 373 {
 374         struct v4l2_device *v4l2_dev = master_data;
 375         struct vimc_platform_data *pdata = comp->platform_data;
 376         struct vimc_sca_device *vsca;
 377         int ret;
 378
 379         /* Allocate the vsca struct */
 380         vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
 381         if (!vsca)
 382                 return -ENOMEM;
 383
 384         /* Initialize ved and sd */
 385         ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
 386                                    pdata->entity_name,
 387                                    MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
 388                                    (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
 389                                    MEDIA_PAD_FL_SOURCE},
 390                                    &vimc_sca_int_ops, &vimc_sca_ops);
 391         if (ret) {
 392                 kfree(vsca);
 393                 return ret;
 394         }
 395
 396         vsca->ved.process_frame = vimc_sca_process_frame;
 397         dev_set_drvdata(comp, &vsca->ved);
 398         vsca->dev = comp;
 399
 400         /* Initialize the frame format */
 401         vsca->sink_fmt = sink_fmt_default;
 402
 403         return 0;
 404 }
 405
 406 static const struct component_ops vimc_sca_comp_ops = {
 407         .bind = vimc_sca_comp_bind,
 408         .unbind = vimc_sca_comp_unbind,
 409 };
 410
 411 static int vimc_sca_probe(struct platform_device *pdev)
 412 {
 413         return component_add(&pdev->dev, &vimc_sca_comp_ops);
 414 }
 415
 416 static int vimc_sca_remove(struct platform_device *pdev)
 417 {
 418         component_del(&pdev->dev, &vimc_sca_comp_ops);
 419
 420         return 0;
 421 }
 422
 423 static const struct platform_device_id vimc_sca_driver_ids[] = {
 424         {
 425                 .name           = VIMC_SCA_DRV_NAME,
 426         },
 427         { }
 428 };
 429
 430 static struct platform_driver vimc_sca_pdrv = {
 431         .probe          = vimc_sca_probe,
 432         .remove         = vimc_sca_remove,
 433         .id_table       = vimc_sca_driver_ids,
 434         .driver         = {
 435                 .name   = VIMC_SCA_DRV_NAME,
 436         },
 437 };
 438
 439 module_platform_driver(vimc_sca_pdrv);
 440
 441 MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
 442
 443 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
 444 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
 445 MODULE_LICENSE("GPL");