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/moduleparam.h> 9 #include <linux/vmalloc.h> 10 #include <linux/v4l2-mediabus.h> 11 #include <media/v4l2-rect.h> 12 #include <media/v4l2-subdev.h> 13 14 #include "vimc-common.h" 15 16 static unsigned int sca_mult = 3; 17 module_param(sca_mult, uint, 0000); 18 MODULE_PARM_DESC(sca_mult, " the image size multiplier"); 19 20 #define MAX_ZOOM 8 21 22 #define VIMC_SCA_FMT_WIDTH_DEFAULT 640 23 #define VIMC_SCA_FMT_HEIGHT_DEFAULT 480 24 25 struct vimc_sca_device { 26 struct vimc_ent_device ved; 27 struct v4l2_subdev sd; 28 /* NOTE: the source fmt is the same as the sink 29 * with the width and hight multiplied by mult 30 */ 31 struct v4l2_mbus_framefmt sink_fmt; 32 struct v4l2_rect crop_rect; 33 /* Values calculated when the stream starts */ 34 u8 *src_frame; 35 unsigned int src_line_size; 36 unsigned int bpp; 37 struct media_pad pads[2]; 38 }; 39 40 static const struct v4l2_mbus_framefmt sink_fmt_default = { 41 .width = VIMC_SCA_FMT_WIDTH_DEFAULT, 42 .height = VIMC_SCA_FMT_HEIGHT_DEFAULT, 43 .code = MEDIA_BUS_FMT_RGB888_1X24, 44 .field = V4L2_FIELD_NONE, 45 .colorspace = V4L2_COLORSPACE_SRGB, 46 }; 47 48 static const struct v4l2_rect crop_rect_default = { 49 .width = VIMC_SCA_FMT_WIDTH_DEFAULT, 50 .height = VIMC_SCA_FMT_HEIGHT_DEFAULT, 51 .top = 0, 52 .left = 0, 53 }; 54 55 static const struct v4l2_rect crop_rect_min = { 56 .width = VIMC_FRAME_MIN_WIDTH, 57 .height = VIMC_FRAME_MIN_HEIGHT, 58 .top = 0, 59 .left = 0, 60 }; 61 62 static struct v4l2_rect 63 vimc_sca_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt) 64 { 65 /* Get the crop bounds to clamp the crop rectangle correctly */ 66 struct v4l2_rect r = { 67 .left = 0, 68 .top = 0, 69 .width = sink_fmt->width, 70 .height = sink_fmt->height, 71 }; 72 return r; 73 } 74 75 static void vimc_sca_adjust_sink_crop(struct v4l2_rect *r, 76 const struct v4l2_mbus_framefmt *sink_fmt) 77 { 78 const struct v4l2_rect sink_rect = 79 vimc_sca_get_crop_bound_sink(sink_fmt); 80 81 /* Disallow rectangles smaller than the minimal one. */ 82 v4l2_rect_set_min_size(r, &crop_rect_min); 83 v4l2_rect_map_inside(r, &sink_rect); 84 } 85 86 static int vimc_sca_init_cfg(struct v4l2_subdev *sd, 87 struct v4l2_subdev_pad_config *cfg) 88 { 89 struct v4l2_mbus_framefmt *mf; 90 struct v4l2_rect *r; 91 unsigned int i; 92 93 mf = v4l2_subdev_get_try_format(sd, cfg, 0); 94 *mf = sink_fmt_default; 95 96 r = v4l2_subdev_get_try_crop(sd, cfg, 0); 97 *r = crop_rect_default; 98 99 for (i = 1; i < sd->entity.num_pads; i++) { 100 mf = v4l2_subdev_get_try_format(sd, cfg, i); 101 *mf = sink_fmt_default; 102 mf->width = mf->width * sca_mult; 103 mf->height = mf->height * sca_mult; 104 } 105 106 return 0; 107 } 108 109 static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd, 110 struct v4l2_subdev_pad_config *cfg, 111 struct v4l2_subdev_mbus_code_enum *code) 112 { 113 u32 mbus_code = vimc_mbus_code_by_index(code->index); 114 const struct vimc_pix_map *vpix; 115 116 if (!mbus_code) 117 return -EINVAL; 118 119 vpix = vimc_pix_map_by_code(mbus_code); 120 121 /* We don't support bayer format */ 122 if (!vpix || vpix->bayer) 123 return -EINVAL; 124 125 code->code = mbus_code; 126 127 return 0; 128 } 129 130 static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd, 131 struct v4l2_subdev_pad_config *cfg, 132 struct v4l2_subdev_frame_size_enum *fse) 133 { 134 const struct vimc_pix_map *vpix; 135 136 if (fse->index) 137 return -EINVAL; 138 139 /* Only accept code in the pix map table in non bayer format */ 140 vpix = vimc_pix_map_by_code(fse->code); 141 if (!vpix || vpix->bayer) 142 return -EINVAL; 143 144 fse->min_width = VIMC_FRAME_MIN_WIDTH; 145 fse->min_height = VIMC_FRAME_MIN_HEIGHT; 146 147 if (VIMC_IS_SINK(fse->pad)) { 148 fse->max_width = VIMC_FRAME_MAX_WIDTH; 149 fse->max_height = VIMC_FRAME_MAX_HEIGHT; 150 } else { 151 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM; 152 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM; 153 } 154 155 return 0; 156 } 157 158 static int vimc_sca_get_fmt(struct v4l2_subdev *sd, 159 struct v4l2_subdev_pad_config *cfg, 160 struct v4l2_subdev_format *format) 161 { 162 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); 163 struct v4l2_rect *crop_rect; 164 165 /* Get the current sink format */ 166 if (format->which == V4L2_SUBDEV_FORMAT_TRY) { 167 format->format = *v4l2_subdev_get_try_format(sd, cfg, 0); 168 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); 169 } else { 170 format->format = vsca->sink_fmt; 171 crop_rect = &vsca->crop_rect; 172 } 173 174 /* Scale the frame size for the source pad */ 175 if (VIMC_IS_SRC(format->pad)) { 176 format->format.width = crop_rect->width * sca_mult; 177 format->format.height = crop_rect->height * sca_mult; 178 } 179 180 return 0; 181 } 182 183 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt) 184 { 185 const struct vimc_pix_map *vpix; 186 187 /* Only accept code in the pix map table in non bayer format */ 188 vpix = vimc_pix_map_by_code(fmt->code); 189 if (!vpix || vpix->bayer) 190 fmt->code = sink_fmt_default.code; 191 192 fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH, 193 VIMC_FRAME_MAX_WIDTH) & ~1; 194 fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT, 195 VIMC_FRAME_MAX_HEIGHT) & ~1; 196 197 if (fmt->field == V4L2_FIELD_ANY) 198 fmt->field = sink_fmt_default.field; 199 200 vimc_colorimetry_clamp(fmt); 201 } 202 203 static int vimc_sca_set_fmt(struct v4l2_subdev *sd, 204 struct v4l2_subdev_pad_config *cfg, 205 struct v4l2_subdev_format *fmt) 206 { 207 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); 208 struct v4l2_mbus_framefmt *sink_fmt; 209 struct v4l2_rect *crop_rect; 210 211 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 212 /* Do not change the format while stream is on */ 213 if (vsca->src_frame) 214 return -EBUSY; 215 216 sink_fmt = &vsca->sink_fmt; 217 crop_rect = &vsca->crop_rect; 218 } else { 219 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); 220 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); 221 } 222 223 /* 224 * Do not change the format of the source pad, 225 * it is propagated from the sink 226 */ 227 if (VIMC_IS_SRC(fmt->pad)) { 228 fmt->format = *sink_fmt; 229 fmt->format.width = crop_rect->width * sca_mult; 230 fmt->format.height = crop_rect->height * sca_mult; 231 } else { 232 /* Set the new format in the sink pad */ 233 vimc_sca_adjust_sink_fmt(&fmt->format); 234 235 dev_dbg(vsca->ved.dev, "%s: sink format update: " 236 "old:%dx%d (0x%x, %d, %d, %d, %d) " 237 "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name, 238 /* old */ 239 sink_fmt->width, sink_fmt->height, sink_fmt->code, 240 sink_fmt->colorspace, sink_fmt->quantization, 241 sink_fmt->xfer_func, sink_fmt->ycbcr_enc, 242 /* new */ 243 fmt->format.width, fmt->format.height, fmt->format.code, 244 fmt->format.colorspace, fmt->format.quantization, 245 fmt->format.xfer_func, fmt->format.ycbcr_enc); 246 247 *sink_fmt = fmt->format; 248 249 /* Do the crop, but respect the current bounds */ 250 vimc_sca_adjust_sink_crop(crop_rect, sink_fmt); 251 } 252 253 return 0; 254 } 255 256 static int vimc_sca_get_selection(struct v4l2_subdev *sd, 257 struct v4l2_subdev_pad_config *cfg, 258 struct v4l2_subdev_selection *sel) 259 { 260 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); 261 struct v4l2_mbus_framefmt *sink_fmt; 262 struct v4l2_rect *crop_rect; 263 264 if (VIMC_IS_SRC(sel->pad)) 265 return -EINVAL; 266 267 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 268 sink_fmt = &vsca->sink_fmt; 269 crop_rect = &vsca->crop_rect; 270 } else { 271 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); 272 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); 273 } 274 275 switch (sel->target) { 276 case V4L2_SEL_TGT_CROP: 277 sel->r = *crop_rect; 278 break; 279 case V4L2_SEL_TGT_CROP_BOUNDS: 280 sel->r = vimc_sca_get_crop_bound_sink(sink_fmt); 281 break; 282 default: 283 return -EINVAL; 284 } 285 286 return 0; 287 } 288 289 static int vimc_sca_set_selection(struct v4l2_subdev *sd, 290 struct v4l2_subdev_pad_config *cfg, 291 struct v4l2_subdev_selection *sel) 292 { 293 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); 294 struct v4l2_mbus_framefmt *sink_fmt; 295 struct v4l2_rect *crop_rect; 296 297 if (VIMC_IS_SRC(sel->pad)) 298 return -EINVAL; 299 300 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 301 /* Do not change the format while stream is on */ 302 if (vsca->src_frame) 303 return -EBUSY; 304 305 crop_rect = &vsca->crop_rect; 306 sink_fmt = &vsca->sink_fmt; 307 } else { 308 crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); 309 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); 310 } 311 312 switch (sel->target) { 313 case V4L2_SEL_TGT_CROP: 314 /* Do the crop, but respect the current bounds */ 315 vimc_sca_adjust_sink_crop(&sel->r, sink_fmt); 316 *crop_rect = sel->r; 317 break; 318 default: 319 return -EINVAL; 320 } 321 322 return 0; 323 } 324 325 static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = { 326 .init_cfg = vimc_sca_init_cfg, 327 .enum_mbus_code = vimc_sca_enum_mbus_code, 328 .enum_frame_size = vimc_sca_enum_frame_size, 329 .get_fmt = vimc_sca_get_fmt, 330 .set_fmt = vimc_sca_set_fmt, 331 .get_selection = vimc_sca_get_selection, 332 .set_selection = vimc_sca_set_selection, 333 }; 334 335 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable) 336 { 337 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); 338 339 if (enable) { 340 const struct vimc_pix_map *vpix; 341 unsigned int frame_size; 342 343 if (vsca->src_frame) 344 return 0; 345 346 /* Save the bytes per pixel of the sink */ 347 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code); 348 vsca->bpp = vpix->bpp; 349 350 /* Calculate the width in bytes of the src frame */ 351 vsca->src_line_size = vsca->crop_rect.width * 352 sca_mult * vsca->bpp; 353 354 /* Calculate the frame size of the source pad */ 355 frame_size = vsca->src_line_size * vsca->crop_rect.height * 356 sca_mult; 357 358 /* Allocate the frame buffer. Use vmalloc to be able to 359 * allocate a large amount of memory 360 */ 361 vsca->src_frame = vmalloc(frame_size); 362 if (!vsca->src_frame) 363 return -ENOMEM; 364 365 } else { 366 if (!vsca->src_frame) 367 return 0; 368 369 vfree(vsca->src_frame); 370 vsca->src_frame = NULL; 371 } 372 373 return 0; 374 } 375 376 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = { 377 .s_stream = vimc_sca_s_stream, 378 }; 379 380 static const struct v4l2_subdev_ops vimc_sca_ops = { 381 .pad = &vimc_sca_pad_ops, 382 .video = &vimc_sca_video_ops, 383 }; 384 385 static void vimc_sca_fill_pix(u8 *const ptr, 386 const u8 *const pixel, 387 const unsigned int bpp) 388 { 389 unsigned int i; 390 391 /* copy the pixel to the pointer */ 392 for (i = 0; i < bpp; i++) 393 ptr[i] = pixel[i]; 394 } 395 396 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca, 397 unsigned int lin, unsigned int col, 398 const u8 *const sink_frame) 399 { 400 const struct v4l2_rect crop_rect = vsca->crop_rect; 401 unsigned int i, j, index; 402 const u8 *pixel; 403 404 /* Point to the pixel value in position (lin, col) in the sink frame */ 405 index = VIMC_FRAME_INDEX(lin, col, 406 vsca->sink_fmt.width, 407 vsca->bpp); 408 pixel = &sink_frame[index]; 409 410 dev_dbg(vsca->ved.dev, 411 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n", 412 vsca->sd.name, lin, col, index); 413 414 /* point to the place we are going to put the first pixel 415 * in the scaled src frame 416 */ 417 lin -= crop_rect.top; 418 col -= crop_rect.left; 419 index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult, 420 crop_rect.width * sca_mult, vsca->bpp); 421 422 dev_dbg(vsca->ved.dev, "sca: %s: scale_pix src pos %dx%d, index %d\n", 423 vsca->sd.name, lin * sca_mult, col * sca_mult, index); 424 425 /* Repeat this pixel mult times */ 426 for (i = 0; i < sca_mult; i++) { 427 /* Iterate through each beginning of a 428 * pixel repetition in a line 429 */ 430 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) { 431 dev_dbg(vsca->ved.dev, 432 "sca: %s: sca: scale_pix src pos %d\n", 433 vsca->sd.name, index + j); 434 435 /* copy the pixel to the position index + j */ 436 vimc_sca_fill_pix(&vsca->src_frame[index + j], 437 pixel, vsca->bpp); 438 } 439 440 /* move the index to the next line */ 441 index += vsca->src_line_size; 442 } 443 } 444 445 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca, 446 const u8 *const sink_frame) 447 { 448 const struct v4l2_rect r = vsca->crop_rect; 449 unsigned int i, j; 450 451 /* Scale each pixel from the original sink frame */ 452 /* TODO: implement scale down, only scale up is supported for now */ 453 for (i = r.top; i < r.top + r.height; i++) 454 for (j = r.left; j < r.left + r.width; j++) 455 vimc_sca_scale_pix(vsca, i, j, sink_frame); 456 } 457 458 static void *vimc_sca_process_frame(struct vimc_ent_device *ved, 459 const void *sink_frame) 460 { 461 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device, 462 ved); 463 464 /* If the stream in this node is not active, just return */ 465 if (!vsca->src_frame) 466 return ERR_PTR(-EINVAL); 467 468 vimc_sca_fill_src_frame(vsca, sink_frame); 469 470 return vsca->src_frame; 471 }; 472 473 static void vimc_sca_release(struct vimc_ent_device *ved) 474 { 475 struct vimc_sca_device *vsca = 476 container_of(ved, struct vimc_sca_device, ved); 477 478 media_entity_cleanup(vsca->ved.ent); 479 kfree(vsca); 480 } 481 482 static struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc, 483 const char *vcfg_name) 484 { 485 struct v4l2_device *v4l2_dev = &vimc->v4l2_dev; 486 struct vimc_sca_device *vsca; 487 int ret; 488 489 /* Allocate the vsca struct */ 490 vsca = kzalloc(sizeof(*vsca), GFP_KERNEL); 491 if (!vsca) 492 return ERR_PTR(-ENOMEM); 493 494 /* Initialize ved and sd */ 495 vsca->pads[0].flags = MEDIA_PAD_FL_SINK; 496 vsca->pads[1].flags = MEDIA_PAD_FL_SOURCE; 497 498 ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev, 499 vcfg_name, 500 MEDIA_ENT_F_PROC_VIDEO_SCALER, 2, 501 vsca->pads, &vimc_sca_ops); 502 if (ret) { 503 kfree(vsca); 504 return ERR_PTR(ret); 505 } 506 507 vsca->ved.process_frame = vimc_sca_process_frame; 508 vsca->ved.dev = vimc->mdev.dev; 509 510 /* Initialize the frame format */ 511 vsca->sink_fmt = sink_fmt_default; 512 513 /* Initialize the crop selection */ 514 vsca->crop_rect = crop_rect_default; 515 516 return &vsca->ved; 517 } 518 519 struct vimc_ent_type vimc_sca_type = { 520 .add = vimc_sca_add, 521 .release = vimc_sca_release 522 }; 523