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 vimc_scaler_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 media_pad pads[2]; 30 31 u8 *src_frame; 32 33 /* 34 * Virtual "hardware" configuration, filled when the stream starts or 35 * when controls are set. 36 */ 37 struct { 38 struct v4l2_mbus_framefmt sink_fmt; 39 struct v4l2_mbus_framefmt src_fmt; 40 struct v4l2_rect sink_crop; 41 unsigned int bpp; 42 } hw; 43 }; 44 45 static const struct v4l2_mbus_framefmt fmt_default = { 46 .width = VIMC_SCALER_FMT_WIDTH_DEFAULT, 47 .height = VIMC_SCALER_FMT_HEIGHT_DEFAULT, 48 .code = MEDIA_BUS_FMT_RGB888_1X24, 49 .field = V4L2_FIELD_NONE, 50 .colorspace = V4L2_COLORSPACE_SRGB, 51 }; 52 53 static const struct v4l2_rect crop_rect_default = { 54 .width = VIMC_SCALER_FMT_WIDTH_DEFAULT, 55 .height = VIMC_SCALER_FMT_HEIGHT_DEFAULT, 56 .top = 0, 57 .left = 0, 58 }; 59 60 static const struct v4l2_rect crop_rect_min = { 61 .width = VIMC_FRAME_MIN_WIDTH, 62 .height = VIMC_FRAME_MIN_HEIGHT, 63 .top = 0, 64 .left = 0, 65 }; 66 67 static struct v4l2_rect 68 vimc_scaler_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt) 69 { 70 /* Get the crop bounds to clamp the crop rectangle correctly */ 71 struct v4l2_rect r = { 72 .left = 0, 73 .top = 0, 74 .width = sink_fmt->width, 75 .height = sink_fmt->height, 76 }; 77 return r; 78 } 79 80 static int vimc_scaler_init_state(struct v4l2_subdev *sd, 81 struct v4l2_subdev_state *sd_state) 82 { 83 struct v4l2_mbus_framefmt *mf; 84 struct v4l2_rect *r; 85 unsigned int i; 86 87 for (i = 0; i < sd->entity.num_pads; i++) { 88 mf = v4l2_subdev_state_get_format(sd_state, i); 89 *mf = fmt_default; 90 } 91 92 r = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 93 *r = crop_rect_default; 94 95 return 0; 96 } 97 98 static int vimc_scaler_enum_mbus_code(struct v4l2_subdev *sd, 99 struct v4l2_subdev_state *sd_state, 100 struct v4l2_subdev_mbus_code_enum *code) 101 { 102 u32 mbus_code = vimc_mbus_code_by_index(code->index); 103 const struct vimc_pix_map *vpix; 104 105 if (!mbus_code) 106 return -EINVAL; 107 108 vpix = vimc_pix_map_by_code(mbus_code); 109 110 /* We don't support bayer format */ 111 if (!vpix || vpix->bayer) 112 return -EINVAL; 113 114 code->code = mbus_code; 115 116 return 0; 117 } 118 119 static int vimc_scaler_enum_frame_size(struct v4l2_subdev *sd, 120 struct v4l2_subdev_state *sd_state, 121 struct v4l2_subdev_frame_size_enum *fse) 122 { 123 const struct vimc_pix_map *vpix; 124 125 if (fse->index) 126 return -EINVAL; 127 128 /* Only accept code in the pix map table in non bayer format */ 129 vpix = vimc_pix_map_by_code(fse->code); 130 if (!vpix || vpix->bayer) 131 return -EINVAL; 132 133 fse->min_width = VIMC_FRAME_MIN_WIDTH; 134 fse->min_height = VIMC_FRAME_MIN_HEIGHT; 135 136 fse->max_width = VIMC_FRAME_MAX_WIDTH; 137 fse->max_height = VIMC_FRAME_MAX_HEIGHT; 138 139 return 0; 140 } 141 142 static int vimc_scaler_set_fmt(struct v4l2_subdev *sd, 143 struct v4l2_subdev_state *sd_state, 144 struct v4l2_subdev_format *format) 145 { 146 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 147 struct v4l2_mbus_framefmt *fmt; 148 149 /* Do not change the active format while stream is on */ 150 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame) 151 return -EBUSY; 152 153 fmt = v4l2_subdev_state_get_format(sd_state, format->pad); 154 155 /* 156 * The media bus code and colorspace can only be changed on the sink 157 * pad, the source pad only follows. 158 */ 159 if (format->pad == VIMC_SCALER_SINK) { 160 const struct vimc_pix_map *vpix; 161 162 /* Only accept code in the pix map table in non bayer format. */ 163 vpix = vimc_pix_map_by_code(format->format.code); 164 if (vpix && !vpix->bayer) 165 fmt->code = format->format.code; 166 else 167 fmt->code = fmt_default.code; 168 169 /* Clamp the colorspace to valid values. */ 170 fmt->colorspace = format->format.colorspace; 171 fmt->ycbcr_enc = format->format.ycbcr_enc; 172 fmt->quantization = format->format.quantization; 173 fmt->xfer_func = format->format.xfer_func; 174 vimc_colorimetry_clamp(fmt); 175 } 176 177 /* Clamp and align the width and height */ 178 fmt->width = clamp_t(u32, format->format.width, VIMC_FRAME_MIN_WIDTH, 179 VIMC_FRAME_MAX_WIDTH) & ~1; 180 fmt->height = clamp_t(u32, format->format.height, VIMC_FRAME_MIN_HEIGHT, 181 VIMC_FRAME_MAX_HEIGHT) & ~1; 182 183 /* 184 * Propagate the sink pad format to the crop rectangle and the source 185 * pad. 186 */ 187 if (format->pad == VIMC_SCALER_SINK) { 188 struct v4l2_mbus_framefmt *src_fmt; 189 struct v4l2_rect *crop; 190 191 crop = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 192 crop->width = fmt->width; 193 crop->height = fmt->height; 194 crop->top = 0; 195 crop->left = 0; 196 197 src_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SRC); 198 *src_fmt = *fmt; 199 } 200 201 format->format = *fmt; 202 203 return 0; 204 } 205 206 static int vimc_scaler_get_selection(struct v4l2_subdev *sd, 207 struct v4l2_subdev_state *sd_state, 208 struct v4l2_subdev_selection *sel) 209 { 210 struct v4l2_mbus_framefmt *sink_fmt; 211 212 if (VIMC_IS_SRC(sel->pad)) 213 return -EINVAL; 214 215 switch (sel->target) { 216 case V4L2_SEL_TGT_CROP: 217 sel->r = *v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 218 break; 219 case V4L2_SEL_TGT_CROP_BOUNDS: 220 sink_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SINK); 221 sel->r = vimc_scaler_get_crop_bound_sink(sink_fmt); 222 break; 223 default: 224 return -EINVAL; 225 } 226 227 return 0; 228 } 229 230 static void vimc_scaler_adjust_sink_crop(struct v4l2_rect *r, 231 const struct v4l2_mbus_framefmt *sink_fmt) 232 { 233 const struct v4l2_rect sink_rect = 234 vimc_scaler_get_crop_bound_sink(sink_fmt); 235 236 /* Disallow rectangles smaller than the minimal one. */ 237 v4l2_rect_set_min_size(r, &crop_rect_min); 238 v4l2_rect_map_inside(r, &sink_rect); 239 } 240 241 static int vimc_scaler_set_selection(struct v4l2_subdev *sd, 242 struct v4l2_subdev_state *sd_state, 243 struct v4l2_subdev_selection *sel) 244 { 245 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 246 struct v4l2_mbus_framefmt *sink_fmt; 247 struct v4l2_rect *crop_rect; 248 249 /* Only support setting the crop of the sink pad */ 250 if (VIMC_IS_SRC(sel->pad) || sel->target != V4L2_SEL_TGT_CROP) 251 return -EINVAL; 252 253 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame) 254 return -EBUSY; 255 256 crop_rect = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK); 257 sink_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SINK); 258 vimc_scaler_adjust_sink_crop(&sel->r, sink_fmt); 259 *crop_rect = sel->r; 260 261 return 0; 262 } 263 264 static const struct v4l2_subdev_pad_ops vimc_scaler_pad_ops = { 265 .enum_mbus_code = vimc_scaler_enum_mbus_code, 266 .enum_frame_size = vimc_scaler_enum_frame_size, 267 .get_fmt = v4l2_subdev_get_fmt, 268 .set_fmt = vimc_scaler_set_fmt, 269 .get_selection = vimc_scaler_get_selection, 270 .set_selection = vimc_scaler_set_selection, 271 }; 272 273 static int vimc_scaler_s_stream(struct v4l2_subdev *sd, int enable) 274 { 275 struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd); 276 277 if (enable) { 278 struct v4l2_subdev_state *state; 279 const struct v4l2_mbus_framefmt *format; 280 const struct v4l2_rect *rect; 281 unsigned int frame_size; 282 283 if (vscaler->src_frame) 284 return 0; 285 286 state = v4l2_subdev_lock_and_get_active_state(sd); 287 288 /* Save the bytes per pixel of the sink. */ 289 format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SINK); 290 vscaler->hw.sink_fmt = *format; 291 vscaler->hw.bpp = vimc_pix_map_by_code(format->code)->bpp; 292 293 /* Calculate the frame size of the source pad. */ 294 format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SRC); 295 vscaler->hw.src_fmt = *format; 296 frame_size = format->width * format->height * vscaler->hw.bpp; 297 298 rect = v4l2_subdev_state_get_crop(state, VIMC_SCALER_SINK); 299 vscaler->hw.sink_crop = *rect; 300 301 v4l2_subdev_unlock_state(state); 302 303 /* 304 * Allocate the frame buffer. Use vmalloc to be able to allocate 305 * a large amount of memory. 306 */ 307 vscaler->src_frame = vmalloc(frame_size); 308 if (!vscaler->src_frame) 309 return -ENOMEM; 310 } else { 311 if (!vscaler->src_frame) 312 return 0; 313 314 vfree(vscaler->src_frame); 315 vscaler->src_frame = NULL; 316 } 317 318 return 0; 319 } 320 321 static const struct v4l2_subdev_video_ops vimc_scaler_video_ops = { 322 .s_stream = vimc_scaler_s_stream, 323 }; 324 325 static const struct v4l2_subdev_ops vimc_scaler_ops = { 326 .pad = &vimc_scaler_pad_ops, 327 .video = &vimc_scaler_video_ops, 328 }; 329 330 static const struct v4l2_subdev_internal_ops vimc_scaler_internal_ops = { 331 .init_state = vimc_scaler_init_state, 332 }; 333 334 static void vimc_scaler_fill_src_frame(const struct vimc_scaler_device *const vscaler, 335 const u8 *const sink_frame) 336 { 337 const struct v4l2_mbus_framefmt *sink_fmt = &vscaler->hw.sink_fmt; 338 const struct v4l2_mbus_framefmt *src_fmt = &vscaler->hw.src_fmt; 339 const struct v4l2_rect *r = &vscaler->hw.sink_crop; 340 unsigned int src_x, src_y; 341 u8 *walker = vscaler->src_frame; 342 343 /* Set each pixel at the src_frame to its sink_frame equivalent */ 344 for (src_y = 0; src_y < src_fmt->height; src_y++) { 345 unsigned int snk_y, y_offset; 346 347 snk_y = (src_y * r->height) / src_fmt->height + r->top; 348 y_offset = snk_y * sink_fmt->width * vscaler->hw.bpp; 349 350 for (src_x = 0; src_x < src_fmt->width; src_x++) { 351 unsigned int snk_x, x_offset, index; 352 353 snk_x = (src_x * r->width) / src_fmt->width + r->left; 354 x_offset = snk_x * vscaler->hw.bpp; 355 index = y_offset + x_offset; 356 memcpy(walker, &sink_frame[index], vscaler->hw.bpp); 357 walker += vscaler->hw.bpp; 358 } 359 } 360 } 361 362 static void *vimc_scaler_process_frame(struct vimc_ent_device *ved, 363 const void *sink_frame) 364 { 365 struct vimc_scaler_device *vscaler = container_of(ved, struct vimc_scaler_device, 366 ved); 367 368 /* If the stream in this node is not active, just return */ 369 if (!vscaler->src_frame) 370 return ERR_PTR(-EINVAL); 371 372 vimc_scaler_fill_src_frame(vscaler, sink_frame); 373 374 return vscaler->src_frame; 375 }; 376 377 static void vimc_scaler_release(struct vimc_ent_device *ved) 378 { 379 struct vimc_scaler_device *vscaler = 380 container_of(ved, struct vimc_scaler_device, ved); 381 382 v4l2_subdev_cleanup(&vscaler->sd); 383 media_entity_cleanup(vscaler->ved.ent); 384 kfree(vscaler); 385 } 386 387 static struct vimc_ent_device *vimc_scaler_add(struct vimc_device *vimc, 388 const char *vcfg_name) 389 { 390 struct v4l2_device *v4l2_dev = &vimc->v4l2_dev; 391 struct vimc_scaler_device *vscaler; 392 int ret; 393 394 /* Allocate the vscaler struct */ 395 vscaler = kzalloc(sizeof(*vscaler), GFP_KERNEL); 396 if (!vscaler) 397 return ERR_PTR(-ENOMEM); 398 399 /* Initialize ved and sd */ 400 vscaler->pads[VIMC_SCALER_SINK].flags = MEDIA_PAD_FL_SINK; 401 vscaler->pads[VIMC_SCALER_SRC].flags = MEDIA_PAD_FL_SOURCE; 402 403 ret = vimc_ent_sd_register(&vscaler->ved, &vscaler->sd, v4l2_dev, 404 vcfg_name, 405 MEDIA_ENT_F_PROC_VIDEO_SCALER, 2, 406 vscaler->pads, &vimc_scaler_internal_ops, 407 &vimc_scaler_ops); 408 if (ret) { 409 kfree(vscaler); 410 return ERR_PTR(ret); 411 } 412 413 vscaler->ved.process_frame = vimc_scaler_process_frame; 414 vscaler->ved.dev = vimc->mdev.dev; 415 416 return &vscaler->ved; 417 } 418 419 const struct vimc_ent_type vimc_scaler_type = { 420 .add = vimc_scaler_add, 421 .release = vimc_scaler_release 422 }; 423