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