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/string.h> 10 #include <linux/vmalloc.h> 11 #include <linux/v4l2-mediabus.h> 12 #include <media/v4l2-rect.h> 13 #include <media/v4l2-subdev.h> 14 15 #include "vimc-common.h" 16 17 /* Pad identifier */ 18 enum vic_sca_pad { 19 VIMC_SCALER_SINK = 0, 20 VIMC_SCALER_SRC = 1, 21 }; 22 23 #define VIMC_SCALER_FMT_WIDTH_DEFAULT 640 24 #define VIMC_SCALER_FMT_HEIGHT_DEFAULT 480 25 26 struct vimc_scaler_device { 27 struct vimc_ent_device ved; 28 struct v4l2_subdev sd; 29 struct v4l2_rect crop_rect; 30 /* Frame format for both sink and src pad */ 31 struct v4l2_mbus_framefmt fmt[2]; 32 /* Values calculated when the stream starts */ 33 u8 *src_frame; 34 unsigned int bpp; 35 struct media_pad pads[2]; 36 }; 37 38 static const struct v4l2_mbus_framefmt fmt_default = { 39 .width = VIMC_SCALER_FMT_WIDTH_DEFAULT, 40 .height = VIMC_SCALER_FMT_HEIGHT_DEFAULT, 41 .code = MEDIA_BUS_FMT_RGB888_1X24, 42 .field = V4L2_FIELD_NONE, 43 .colorspace = V4L2_COLORSPACE_SRGB, 44 }; 45 46 static const struct v4l2_rect crop_rect_default = { 47 .width = VIMC_SCALER_FMT_WIDTH_DEFAULT, 48 .height = VIMC_SCALER_FMT_HEIGHT_DEFAULT, 49 .top = 0, 50 .left = 0, 51 }; 52 53 static const struct v4l2_rect crop_rect_min = { 54 .width = VIMC_FRAME_MIN_WIDTH, 55 .height = VIMC_FRAME_MIN_HEIGHT, 56 .top = 0, 57 .left = 0, 58 }; 59 60 static struct v4l2_rect 61 vimc_scaler_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt) 62 { 63 /* Get the crop bounds to clamp the crop rectangle correctly */ 64 struct v4l2_rect r = { 65 .left = 0, 66 .top = 0, 67 .width = sink_fmt->width, 68 .height = sink_fmt->height, 69 }; 70 return r; 71 } 72 73 static int vimc_scaler_init_state(struct v4l2_subdev *sd, 74 struct v4l2_subdev_state *sd_state) 75 { 76 struct v4l2_mbus_framefmt *mf; 77 struct v4l2_rect *r; 78 unsigned int i; 79 80 for (i = 0; i < sd->entity.num_pads; i++) { 81 mf = v4l2_subdev_state_get_format(sd_state, i); 82 *mf = fmt_default; 83 } 84 85 r = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 86 *r = crop_rect_default; 87 88 return 0; 89 } 90 91 static int vimc_scaler_enum_mbus_code(struct v4l2_subdev *sd, 92 struct v4l2_subdev_state *sd_state, 93 struct v4l2_subdev_mbus_code_enum *code) 94 { 95 u32 mbus_code = vimc_mbus_code_by_index(code->index); 96 const struct vimc_pix_map *vpix; 97 98 if (!mbus_code) 99 return -EINVAL; 100 101 vpix = vimc_pix_map_by_code(mbus_code); 102 103 /* We don't support bayer format */ 104 if (!vpix || vpix->bayer) 105 return -EINVAL; 106 107 code->code = mbus_code; 108 109 return 0; 110 } 111 112 static int vimc_scaler_enum_frame_size(struct v4l2_subdev *sd, 113 struct v4l2_subdev_state *sd_state, 114 struct v4l2_subdev_frame_size_enum *fse) 115 { 116 const struct vimc_pix_map *vpix; 117 118 if (fse->index) 119 return -EINVAL; 120 121 /* Only accept code in the pix map table in non bayer format */ 122 vpix = vimc_pix_map_by_code(fse->code); 123 if (!vpix || vpix->bayer) 124 return -EINVAL; 125 126 fse->min_width = VIMC_FRAME_MIN_WIDTH; 127 fse->min_height = VIMC_FRAME_MIN_HEIGHT; 128 129 fse->max_width = VIMC_FRAME_MAX_WIDTH; 130 fse->max_height = VIMC_FRAME_MAX_HEIGHT; 131 132 return 0; 133 } 134 135 static struct v4l2_mbus_framefmt * 136 vimc_scaler_pad_format(struct vimc_scaler_device *vscaler, 137 struct v4l2_subdev_state *sd_state, u32 pad, 138 enum v4l2_subdev_format_whence which) 139 { 140 if (which == V4L2_SUBDEV_FORMAT_TRY) 141 return v4l2_subdev_state_get_format(sd_state, pad); 142 else 143 return &vscaler->fmt[pad]; 144 } 145 146 static struct v4l2_rect * 147 vimc_scaler_pad_crop(struct vimc_scaler_device *vscaler, 148 struct v4l2_subdev_state *sd_state, 149 enum v4l2_subdev_format_whence which) 150 { 151 if (which == V4L2_SUBDEV_FORMAT_TRY) 152 return v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 153 else 154 return &vscaler->crop_rect; 155 } 156 157 static int vimc_scaler_get_fmt(struct v4l2_subdev *sd, 158 struct v4l2_subdev_state *sd_state, 159 struct v4l2_subdev_format *format) 160 { 161 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 162 163 format->format = *vimc_scaler_pad_format(vscaler, sd_state, format->pad, 164 format->which); 165 return 0; 166 } 167 168 static int vimc_scaler_set_fmt(struct v4l2_subdev *sd, 169 struct v4l2_subdev_state *sd_state, 170 struct v4l2_subdev_format *format) 171 { 172 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 173 struct v4l2_mbus_framefmt *fmt; 174 175 /* Do not change the active format while stream is on */ 176 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame) 177 return -EBUSY; 178 179 fmt = vimc_scaler_pad_format(vscaler, sd_state, format->pad, format->which); 180 181 /* 182 * The media bus code and colorspace can only be changed on the sink 183 * pad, the source pad only follows. 184 */ 185 if (format->pad == VIMC_SCALER_SINK) { 186 const struct vimc_pix_map *vpix; 187 188 /* Only accept code in the pix map table in non bayer format. */ 189 vpix = vimc_pix_map_by_code(format->format.code); 190 if (vpix && !vpix->bayer) 191 fmt->code = format->format.code; 192 else 193 fmt->code = fmt_default.code; 194 195 /* Clamp the colorspace to valid values. */ 196 fmt->colorspace = format->format.colorspace; 197 fmt->ycbcr_enc = format->format.ycbcr_enc; 198 fmt->quantization = format->format.quantization; 199 fmt->xfer_func = format->format.xfer_func; 200 vimc_colorimetry_clamp(fmt); 201 } 202 203 /* Clamp and align the width and height */ 204 fmt->width = clamp_t(u32, format->format.width, VIMC_FRAME_MIN_WIDTH, 205 VIMC_FRAME_MAX_WIDTH) & ~1; 206 fmt->height = clamp_t(u32, format->format.height, VIMC_FRAME_MIN_HEIGHT, 207 VIMC_FRAME_MAX_HEIGHT) & ~1; 208 209 /* 210 * Propagate the sink pad format to the crop rectangle and the source 211 * pad. 212 */ 213 if (format->pad == VIMC_SCALER_SINK) { 214 struct v4l2_mbus_framefmt *src_fmt; 215 struct v4l2_rect *crop; 216 217 crop = vimc_scaler_pad_crop(vscaler, sd_state, format->which); 218 crop->width = fmt->width; 219 crop->height = fmt->height; 220 crop->top = 0; 221 crop->left = 0; 222 223 src_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SRC, 224 format->which); 225 *src_fmt = *fmt; 226 } 227 228 format->format = *fmt; 229 230 return 0; 231 } 232 233 static int vimc_scaler_get_selection(struct v4l2_subdev *sd, 234 struct v4l2_subdev_state *sd_state, 235 struct v4l2_subdev_selection *sel) 236 { 237 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 238 struct v4l2_mbus_framefmt *sink_fmt; 239 240 if (VIMC_IS_SRC(sel->pad)) 241 return -EINVAL; 242 243 switch (sel->target) { 244 case V4L2_SEL_TGT_CROP: 245 sel->r = *vimc_scaler_pad_crop(vscaler, sd_state, sel->which); 246 break; 247 case V4L2_SEL_TGT_CROP_BOUNDS: 248 sink_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SINK, 249 sel->which); 250 sel->r = vimc_scaler_get_crop_bound_sink(sink_fmt); 251 break; 252 default: 253 return -EINVAL; 254 } 255 256 return 0; 257 } 258 259 static void vimc_scaler_adjust_sink_crop(struct v4l2_rect *r, 260 const struct v4l2_mbus_framefmt *sink_fmt) 261 { 262 const struct v4l2_rect sink_rect = 263 vimc_scaler_get_crop_bound_sink(sink_fmt); 264 265 /* Disallow rectangles smaller than the minimal one. */ 266 v4l2_rect_set_min_size(r, &crop_rect_min); 267 v4l2_rect_map_inside(r, &sink_rect); 268 } 269 270 static int vimc_scaler_set_selection(struct v4l2_subdev *sd, 271 struct v4l2_subdev_state *sd_state, 272 struct v4l2_subdev_selection *sel) 273 { 274 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 275 struct v4l2_mbus_framefmt *sink_fmt; 276 struct v4l2_rect *crop_rect; 277 278 /* Only support setting the crop of the sink pad */ 279 if (VIMC_IS_SRC(sel->pad) || sel->target != V4L2_SEL_TGT_CROP) 280 return -EINVAL; 281 282 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame) 283 return -EBUSY; 284 285 crop_rect = vimc_scaler_pad_crop(vscaler, sd_state, sel->which); 286 sink_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SINK, 287 sel->which); 288 vimc_scaler_adjust_sink_crop(&sel->r, sink_fmt); 289 *crop_rect = sel->r; 290 291 return 0; 292 } 293 294 static const struct v4l2_subdev_pad_ops vimc_scaler_pad_ops = { 295 .enum_mbus_code = vimc_scaler_enum_mbus_code, 296 .enum_frame_size = vimc_scaler_enum_frame_size, 297 .get_fmt = vimc_scaler_get_fmt, 298 .set_fmt = vimc_scaler_set_fmt, 299 .get_selection = vimc_scaler_get_selection, 300 .set_selection = vimc_scaler_set_selection, 301 }; 302 303 static int vimc_scaler_s_stream(struct v4l2_subdev *sd, int enable) 304 { 305 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 306 307 if (enable) { 308 const struct vimc_pix_map *vpix; 309 unsigned int frame_size; 310 311 if (vscaler->src_frame) 312 return 0; 313 314 /* Save the bytes per pixel of the sink */ 315 vpix = vimc_pix_map_by_code(vscaler->fmt[VIMC_SCALER_SINK].code); 316 vscaler->bpp = vpix->bpp; 317 318 /* Calculate the frame size of the source pad */ 319 frame_size = vscaler->fmt[VIMC_SCALER_SRC].width 320 * vscaler->fmt[VIMC_SCALER_SRC].height * vscaler->bpp; 321 322 /* Allocate the frame buffer. Use vmalloc to be able to 323 * allocate a large amount of memory 324 */ 325 vscaler->src_frame = vmalloc(frame_size); 326 if (!vscaler->src_frame) 327 return -ENOMEM; 328 329 } else { 330 if (!vscaler->src_frame) 331 return 0; 332 333 vfree(vscaler->src_frame); 334 vscaler->src_frame = NULL; 335 } 336 337 return 0; 338 } 339 340 static const struct v4l2_subdev_video_ops vimc_scaler_video_ops = { 341 .s_stream = vimc_scaler_s_stream, 342 }; 343 344 static const struct v4l2_subdev_ops vimc_scaler_ops = { 345 .pad = &vimc_scaler_pad_ops, 346 .video = &vimc_scaler_video_ops, 347 }; 348 349 static const struct v4l2_subdev_internal_ops vimc_scaler_internal_ops = { 350 .init_state = vimc_scaler_init_state, 351 }; 352 353 static void vimc_scaler_fill_src_frame(const struct vimc_scaler_device *const vscaler, 354 const u8 *const sink_frame) 355 { 356 const struct v4l2_mbus_framefmt *src_fmt = &vscaler->fmt[VIMC_SCALER_SRC]; 357 const struct v4l2_rect *r = &vscaler->crop_rect; 358 unsigned int snk_width = vscaler->fmt[VIMC_SCALER_SINK].width; 359 unsigned int src_x, src_y; 360 u8 *walker = vscaler->src_frame; 361 362 /* Set each pixel at the src_frame to its sink_frame equivalent */ 363 for (src_y = 0; src_y < src_fmt->height; src_y++) { 364 unsigned int snk_y, y_offset; 365 366 snk_y = (src_y * r->height) / src_fmt->height + r->top; 367 y_offset = snk_y * snk_width * vscaler->bpp; 368 369 for (src_x = 0; src_x < src_fmt->width; src_x++) { 370 unsigned int snk_x, x_offset, index; 371 372 snk_x = (src_x * r->width) / src_fmt->width + r->left; 373 x_offset = snk_x * vscaler->bpp; 374 index = y_offset + x_offset; 375 memcpy(walker, &sink_frame[index], vscaler->bpp); 376 walker += vscaler->bpp; 377 } 378 } 379 } 380 381 static void *vimc_scaler_process_frame(struct vimc_ent_device *ved, 382 const void *sink_frame) 383 { 384 struct vimc_scaler_device *vscaler = container_of(ved, struct vimc_scaler_device, 385 ved); 386 387 /* If the stream in this node is not active, just return */ 388 if (!vscaler->src_frame) 389 return ERR_PTR(-EINVAL); 390 391 vimc_scaler_fill_src_frame(vscaler, sink_frame); 392 393 return vscaler->src_frame; 394 }; 395 396 static void vimc_scaler_release(struct vimc_ent_device *ved) 397 { 398 struct vimc_scaler_device *vscaler = 399 container_of(ved, struct vimc_scaler_device, ved); 400 401 media_entity_cleanup(vscaler->ved.ent); 402 kfree(vscaler); 403 } 404 405 static struct vimc_ent_device *vimc_scaler_add(struct vimc_device *vimc, 406 const char *vcfg_name) 407 { 408 struct v4l2_device *v4l2_dev = &vimc->v4l2_dev; 409 struct vimc_scaler_device *vscaler; 410 int ret; 411 412 /* Allocate the vscaler struct */ 413 vscaler = kzalloc(sizeof(*vscaler), GFP_KERNEL); 414 if (!vscaler) 415 return ERR_PTR(-ENOMEM); 416 417 /* Initialize ved and sd */ 418 vscaler->pads[VIMC_SCALER_SINK].flags = MEDIA_PAD_FL_SINK; 419 vscaler->pads[VIMC_SCALER_SRC].flags = MEDIA_PAD_FL_SOURCE; 420 421 ret = vimc_ent_sd_register(&vscaler->ved, &vscaler->sd, v4l2_dev, 422 vcfg_name, 423 MEDIA_ENT_F_PROC_VIDEO_SCALER, 2, 424 vscaler->pads, &vimc_scaler_ops); 425 if (ret) { 426 kfree(vscaler); 427 return ERR_PTR(ret); 428 } 429 430 vscaler->sd.internal_ops = &vimc_scaler_internal_ops; 431 432 vscaler->ved.process_frame = vimc_scaler_process_frame; 433 vscaler->ved.dev = vimc->mdev.dev; 434 435 /* Initialize the frame format */ 436 vscaler->fmt[VIMC_SCALER_SINK] = fmt_default; 437 vscaler->fmt[VIMC_SCALER_SRC] = fmt_default; 438 439 /* Initialize the crop selection */ 440 vscaler->crop_rect = crop_rect_default; 441 442 return &vscaler->ved; 443 } 444 445 struct vimc_ent_type vimc_scaler_type = { 446 .add = vimc_scaler_add, 447 .release = vimc_scaler_release 448 }; 449