LXR linux/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
  20static unsigned int sca_mult = 3;
  21module_param(sca_mult, uint, 0000);
  22MODULE_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
  28static const u32 vimc_sca_supported_pixfmt[] = {
  29        V4L2_PIX_FMT_BGR24,
  30        V4L2_PIX_FMT_RGB24,
  31        V4L2_PIX_FMT_ARGB32,
  32};
  33
  34struct 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
  48static 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
  56static 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
  66static 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
  85static 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
 106static 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
 126static 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
 139static 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
 189static 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
 197static 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
 242static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
 243        .s_stream = vimc_sca_s_stream,
 244};
 245
 246static const struct v4l2_subdev_ops vimc_sca_ops = {
 247        .pad = &vimc_sca_pad_ops,
 248        .video = &vimc_sca_video_ops,
 249};
 250
 251static 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
 262static 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
 308static 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
 320static 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
 335static 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
 343static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
 344        .release = vimc_sca_release,
 345};
 346
 347static 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
 358static 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
 393static const struct component_ops vimc_sca_comp_ops = {
 394        .bind = vimc_sca_comp_bind,
 395        .unbind = vimc_sca_comp_unbind,
 396};
 397
 398static int vimc_sca_probe(struct platform_device *pdev)
 399{
 400        return component_add(&pdev->dev, &vimc_sca_comp_ops);
 401}
 402
 403static int vimc_sca_remove(struct platform_device *pdev)
 404{
 405        component_del(&pdev->dev, &vimc_sca_comp_ops);
 406
 407        return 0;
 408}
 409
 410static const struct platform_device_id vimc_sca_driver_ids[] = {
 411        {
 412                .name           = VIMC_SCA_DRV_NAME,
 413        },
 414        { }
 415};
 416
 417static 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
 426module_platform_driver(vimc_sca_pdrv);
 427
 428MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
 429
 430MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
 431MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
 432MODULE_LICENSE("GPL");
 433