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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * vimc-scaler.c Virtual Media Controller Driver4 *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 */18enum vimc_scaler_pad {19 VIMC_SCALER_SINK = 0,20 VIMC_SCALER_SRC = 1,21};22 23#define VIMC_SCALER_FMT_WIDTH_DEFAULT 64024#define VIMC_SCALER_FMT_HEIGHT_DEFAULT 48025 26struct 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 or35 * 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 45static 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 53static 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 60static 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 67static struct v4l2_rect68vimc_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 80static 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 98static 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 119static 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 142static 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 sink157 * 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 else167 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 source185 * 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 206static 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 230static 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 241static 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 264static 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 273static 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 allocate305 * 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 321static const struct v4l2_subdev_video_ops vimc_scaler_video_ops = {322 .s_stream = vimc_scaler_s_stream,323};324 325static const struct v4l2_subdev_ops vimc_scaler_ops = {326 .pad = &vimc_scaler_pad_ops,327 .video = &vimc_scaler_video_ops,328};329 330static const struct v4l2_subdev_internal_ops vimc_scaler_internal_ops = {331 .init_state = vimc_scaler_init_state,332};333 334static 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 362static 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 377static 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 387static 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 419const struct vimc_ent_type vimc_scaler_type = {420 .add = vimc_scaler_add,421 .release = vimc_scaler_release422};423