// SPDX-License-Identifier: GPL-2.0-or-later
/*
* vimc-scaler.c Virtual Media Controller Driver
*
* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
*/
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/v4l2-mediabus.h>
#include <media/v4l2-rect.h>
#include <media/v4l2-subdev.h>
#include "vimc-common.h"
/* Pad identifier */
enum vic_sca_pad {
VIMC_SCALER_SINK = 0,
VIMC_SCALER_SRC = 1,
};
#define VIMC_SCALER_FMT_WIDTH_DEFAULT 640
#define VIMC_SCALER_FMT_HEIGHT_DEFAULT 480
struct vimc_scaler_device {
struct vimc_ent_device ved;
struct v4l2_subdev sd;
struct v4l2_rect crop_rect;
/* Frame format for both sink and src pad */
struct v4l2_mbus_framefmt fmt[2];
/* Values calculated when the stream starts */
u8 *src_frame;
unsigned int bpp;
struct media_pad pads[2];
};
static const struct v4l2_mbus_framefmt fmt_default = {
.width = VIMC_SCALER_FMT_WIDTH_DEFAULT,
.height = VIMC_SCALER_FMT_HEIGHT_DEFAULT,
.code = MEDIA_BUS_FMT_RGB888_1X24,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_SRGB,
};
static const struct v4l2_rect crop_rect_default = {
.width = VIMC_SCALER_FMT_WIDTH_DEFAULT,
.height = VIMC_SCALER_FMT_HEIGHT_DEFAULT,
.top = 0,
.left = 0,
};
static const struct v4l2_rect crop_rect_min = {
.width = VIMC_FRAME_MIN_WIDTH,
.height = VIMC_FRAME_MIN_HEIGHT,
.top = 0,
.left = 0,
};
static struct v4l2_rect
vimc_scaler_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt)
{
/* Get the crop bounds to clamp the crop rectangle correctly */
struct v4l2_rect r = {
.left = 0,
.top = 0,
.width = sink_fmt->width,
.height = sink_fmt->height,
};
return r;
}
static int vimc_scaler_init_cfg(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state)
{
struct v4l2_mbus_framefmt *mf;
struct v4l2_rect *r;
unsigned int i;
for (i = 0; i < sd->entity.num_pads; i++) {
mf = v4l2_subdev_get_try_format(sd, sd_state, i);
*mf = fmt_default;
}
r = v4l2_subdev_get_try_crop(sd, sd_state, VIMC_SCALER_SINK);
*r = crop_rect_default;
return 0;
}
static int vimc_scaler_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
u32 mbus_code = vimc_mbus_code_by_index(code->index);
const struct vimc_pix_map *vpix;
if (!mbus_code)
return -EINVAL;
vpix = vimc_pix_map_by_code(mbus_code);
/* We don't support bayer format */
if (!vpix || vpix->bayer)
return -EINVAL;
code->code = mbus_code;
return 0;
}
static int vimc_scaler_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_frame_size_enum *fse)
{
const struct vimc_pix_map *vpix;
if (fse->index)
return -EINVAL;
/* Only accept code in the pix map table in non bayer format */
vpix = vimc_pix_map_by_code(fse->code);
if (!vpix || vpix->bayer)
return -EINVAL;
fse->min_width = VIMC_FRAME_MIN_WIDTH;
fse->min_height = VIMC_FRAME_MIN_HEIGHT;
fse->max_width = VIMC_FRAME_MAX_WIDTH;
fse->max_height = VIMC_FRAME_MAX_HEIGHT;
return 0;
}
static struct v4l2_mbus_framefmt *
vimc_scaler_pad_format(struct vimc_scaler_device *vscaler,
struct v4l2_subdev_state *sd_state, u32 pad,
enum v4l2_subdev_format_whence which)
{
if (which == V4L2_SUBDEV_FORMAT_TRY)
return v4l2_subdev_get_try_format(&vscaler->sd, sd_state, pad);
else
return &vscaler->fmt[pad];
}
static struct v4l2_rect *
vimc_scaler_pad_crop(struct vimc_scaler_device *vscaler,
struct v4l2_subdev_state *sd_state,
enum v4l2_subdev_format_whence which)
{
if (which == V4L2_SUBDEV_FORMAT_TRY)
return v4l2_subdev_get_try_crop(&vscaler->sd, sd_state,
VIMC_SCALER_SINK);
else
return &vscaler->crop_rect;
}
static int vimc_scaler_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
{
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
format->format = *vimc_scaler_pad_format(vscaler, sd_state, format->pad,
format->which);
return 0;
}
static int vimc_scaler_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
{
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *fmt;
/* Do not change the active format while stream is on */
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
return -EBUSY;
fmt = vimc_scaler_pad_format(vscaler, sd_state, format->pad, format->which);
/*
* The media bus code and colorspace can only be changed on the sink
* pad, the source pad only follows.
*/
if (format->pad == VIMC_SCALER_SINK) {
const struct vimc_pix_map *vpix;
/* Only accept code in the pix map table in non bayer format. */
vpix = vimc_pix_map_by_code(format->format.code);
if (vpix && !vpix->bayer)
fmt->code = format->format.code;
else
fmt->code = fmt_default.code;
/* Clamp the colorspace to valid values. */
fmt->colorspace = format->format.colorspace;
fmt->ycbcr_enc = format->format.ycbcr_enc;
fmt->quantization = format->format.quantization;
fmt->xfer_func = format->format.xfer_func;
vimc_colorimetry_clamp(fmt);
}
/* Clamp and align the width and height */
fmt->width = clamp_t(u32, format->format.width, VIMC_FRAME_MIN_WIDTH,
VIMC_FRAME_MAX_WIDTH) & ~1;
fmt->height = clamp_t(u32, format->format.height, VIMC_FRAME_MIN_HEIGHT,
VIMC_FRAME_MAX_HEIGHT) & ~1;
/*
* Propagate the sink pad format to the crop rectangle and the source
* pad.
*/
if (format->pad == VIMC_SCALER_SINK) {
struct v4l2_mbus_framefmt *src_fmt;
struct v4l2_rect *crop;
crop = vimc_scaler_pad_crop(vscaler, sd_state, format->which);
crop->width = fmt->width;
crop->height = fmt->height;
crop->top = 0;
crop->left = 0;
src_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SRC,
format->which);
*src_fmt = *fmt;
}
format->format = *fmt;
return 0;
}
static int vimc_scaler_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *sink_fmt;
if (VIMC_IS_SRC(sel->pad))
return -EINVAL;
switch (sel->target) {
case V4L2_SEL_TGT_CROP:
sel->r = *vimc_scaler_pad_crop(vscaler, sd_state, sel->which);
break;
case V4L2_SEL_TGT_CROP_BOUNDS:
sink_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SINK,
sel->which);
sel->r = vimc_scaler_get_crop_bound_sink(sink_fmt);
break;
default:
return -EINVAL;
}
return 0;
}
static void vimc_scaler_adjust_sink_crop(struct v4l2_rect *r,
const struct v4l2_mbus_framefmt *sink_fmt)
{
const struct v4l2_rect sink_rect =
vimc_scaler_get_crop_bound_sink(sink_fmt);
/* Disallow rectangles smaller than the minimal one. */
v4l2_rect_set_min_size(r, &crop_rect_min);
v4l2_rect_map_inside(r, &sink_rect);
}
static int vimc_scaler_set_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *sink_fmt;
struct v4l2_rect *crop_rect;
/* Only support setting the crop of the sink pad */
if (VIMC_IS_SRC(sel->pad) || sel->target != V4L2_SEL_TGT_CROP)
return -EINVAL;
if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
return -EBUSY;
crop_rect = vimc_scaler_pad_crop(vscaler, sd_state, sel->which);
sink_fmt = vimc_scaler_pad_format(vscaler, sd_state, VIMC_SCALER_SINK,
sel->which);
vimc_scaler_adjust_sink_crop(&sel->r, sink_fmt);
*crop_rect = sel->r;
return 0;
}
static const struct v4l2_subdev_pad_ops vimc_scaler_pad_ops = {
.init_cfg = vimc_scaler_init_cfg,
.enum_mbus_code = vimc_scaler_enum_mbus_code,
.enum_frame_size = vimc_scaler_enum_frame_size,
.get_fmt = vimc_scaler_get_fmt,
.set_fmt = vimc_scaler_set_fmt,
.get_selection = vimc_scaler_get_selection,
.set_selection = vimc_scaler_set_selection,
};
static int vimc_scaler_s_stream(struct v4l2_subdev *sd, int enable)
{
struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
if (enable) {
const struct vimc_pix_map *vpix;
unsigned int frame_size;
if (vscaler->src_frame)
return 0;
/* Save the bytes per pixel of the sink */
vpix = vimc_pix_map_by_code(vscaler->fmt[VIMC_SCALER_SINK].code);
vscaler->bpp = vpix->bpp;
/* Calculate the frame size of the source pad */
frame_size = vscaler->fmt[VIMC_SCALER_SRC].width
* vscaler->fmt[VIMC_SCALER_SRC].height * vscaler->bpp;
/* Allocate the frame buffer. Use vmalloc to be able to
* allocate a large amount of memory
*/
vscaler->src_frame = vmalloc(frame_size);
if (!vscaler->src_frame)
return -ENOMEM;
} else {
if (!vscaler->src_frame)
return 0;
vfree(vscaler->src_frame);
vscaler->src_frame = NULL;
}
return 0;
}
static const struct v4l2_subdev_video_ops vimc_scaler_video_ops = {
.s_stream = vimc_scaler_s_stream,
};
static const struct v4l2_subdev_ops vimc_scaler_ops = {
.pad = &vimc_scaler_pad_ops,
.video = &vimc_scaler_video_ops,
};
static void vimc_scaler_fill_src_frame(const struct vimc_scaler_device *const vscaler,
const u8 *const sink_frame)
{
const struct v4l2_mbus_framefmt *src_fmt = &vscaler->fmt[VIMC_SCALER_SRC];
const struct v4l2_rect *r = &vscaler->crop_rect;
unsigned int snk_width = vscaler->fmt[VIMC_SCALER_SINK].width;
unsigned int src_x, src_y;
u8 *walker = vscaler->src_frame;
/* Set each pixel at the src_frame to its sink_frame equivalent */
for (src_y = 0; src_y < src_fmt->height; src_y++) {
unsigned int snk_y, y_offset;
snk_y = (src_y * r->height) / src_fmt->height + r->top;
y_offset = snk_y * snk_width * vscaler->bpp;
for (src_x = 0; src_x < src_fmt->width; src_x++) {
unsigned int snk_x, x_offset, index;
snk_x = (src_x * r->width) / src_fmt->width + r->left;
x_offset = snk_x * vscaler->bpp;
index = y_offset + x_offset;
memcpy(walker, &sink_frame[index], vscaler->bpp);
walker += vscaler->bpp;
}
}
}
static void *vimc_scaler_process_frame(struct vimc_ent_device *ved,
const void *sink_frame)
{
struct vimc_scaler_device *vscaler = container_of(ved, struct vimc_scaler_device,
ved);
/* If the stream in this node is not active, just return */
if (!vscaler->src_frame)
return ERR_PTR(-EINVAL);
vimc_scaler_fill_src_frame(vscaler, sink_frame);
return vscaler->src_frame;
};
static void vimc_scaler_release(struct vimc_ent_device *ved)
{
struct vimc_scaler_device *vscaler =
container_of(ved, struct vimc_scaler_device, ved);
media_entity_cleanup(vscaler->ved.ent);
kfree(vscaler);
}
static struct vimc_ent_device *vimc_scaler_add(struct vimc_device *vimc,
const char *vcfg_name)
{
struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
struct vimc_scaler_device *vscaler;
int ret;
/* Allocate the vscaler struct */
vscaler = kzalloc(sizeof(*vscaler), GFP_KERNEL);
if (!vscaler)
return ERR_PTR(-ENOMEM);
/* Initialize ved and sd */
vscaler->pads[VIMC_SCALER_SINK].flags = MEDIA_PAD_FL_SINK;
vscaler->pads[VIMC_SCALER_SRC].flags = MEDIA_PAD_FL_SOURCE;
ret = vimc_ent_sd_register(&vscaler->ved, &vscaler->sd, v4l2_dev,
vcfg_name,
MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
vscaler->pads, &vimc_scaler_ops);
if (ret) {
kfree(vscaler);
return ERR_PTR(ret);
}
vscaler->ved.process_frame = vimc_scaler_process_frame;
vscaler->ved.dev = vimc->mdev.dev;
/* Initialize the frame format */
vscaler->fmt[VIMC_SCALER_SINK] = fmt_default;
vscaler->fmt[VIMC_SCALER_SRC] = fmt_default;
/* Initialize the crop selection */
vscaler->crop_rect = crop_rect_default;
return &vscaler->ved;
}
struct vimc_ent_type vimc_scaler_type = {
.add = vimc_scaler_add,
.release = vimc_scaler_release
};