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522 lines
13 KiB
522 lines
13 KiB
// 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 <[email protected]> |
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*/ |
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#include <linux/moduleparam.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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static unsigned int sca_mult = 3; |
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module_param(sca_mult, uint, 0000); |
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MODULE_PARM_DESC(sca_mult, " the image size multiplier"); |
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#define MAX_ZOOM 8 |
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#define VIMC_SCA_FMT_WIDTH_DEFAULT 640 |
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#define VIMC_SCA_FMT_HEIGHT_DEFAULT 480 |
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struct vimc_sca_device { |
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struct vimc_ent_device ved; |
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struct v4l2_subdev sd; |
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/* NOTE: the source fmt is the same as the sink |
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* with the width and hight multiplied by mult |
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*/ |
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struct v4l2_mbus_framefmt sink_fmt; |
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struct v4l2_rect crop_rect; |
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/* Values calculated when the stream starts */ |
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u8 *src_frame; |
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unsigned int src_line_size; |
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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 sink_fmt_default = { |
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.width = VIMC_SCA_FMT_WIDTH_DEFAULT, |
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.height = VIMC_SCA_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_SCA_FMT_WIDTH_DEFAULT, |
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.height = VIMC_SCA_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_sca_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 void vimc_sca_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_sca_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_sca_init_cfg(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg) |
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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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mf = v4l2_subdev_get_try_format(sd, cfg, 0); |
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*mf = sink_fmt_default; |
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r = v4l2_subdev_get_try_crop(sd, cfg, 0); |
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*r = crop_rect_default; |
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for (i = 1; i < sd->entity.num_pads; i++) { |
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mf = v4l2_subdev_get_try_format(sd, cfg, i); |
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*mf = sink_fmt_default; |
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mf->width = mf->width * sca_mult; |
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mf->height = mf->height * sca_mult; |
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} |
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return 0; |
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} |
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static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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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_sca_enum_frame_size(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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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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if (VIMC_IS_SINK(fse->pad)) { |
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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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} else { |
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fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM; |
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fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM; |
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} |
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return 0; |
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} |
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static int vimc_sca_get_fmt(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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struct v4l2_subdev_format *format) |
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{ |
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struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd); |
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struct v4l2_rect *crop_rect; |
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/* Get the current sink format */ |
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if (format->which == V4L2_SUBDEV_FORMAT_TRY) { |
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format->format = *v4l2_subdev_get_try_format(sd, cfg, 0); |
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crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); |
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} else { |
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format->format = vsca->sink_fmt; |
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crop_rect = &vsca->crop_rect; |
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} |
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/* Scale the frame size for the source pad */ |
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if (VIMC_IS_SRC(format->pad)) { |
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format->format.width = crop_rect->width * sca_mult; |
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format->format.height = crop_rect->height * sca_mult; |
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} |
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return 0; |
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} |
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static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt) |
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{ |
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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(fmt->code); |
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if (!vpix || vpix->bayer) |
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fmt->code = sink_fmt_default.code; |
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fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH, |
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VIMC_FRAME_MAX_WIDTH) & ~1; |
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fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT, |
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VIMC_FRAME_MAX_HEIGHT) & ~1; |
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if (fmt->field == V4L2_FIELD_ANY) |
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fmt->field = sink_fmt_default.field; |
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vimc_colorimetry_clamp(fmt); |
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} |
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static int vimc_sca_set_fmt(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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struct v4l2_subdev_format *fmt) |
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{ |
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struct vimc_sca_device *vsca = 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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if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) { |
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/* Do not change the format while stream is on */ |
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if (vsca->src_frame) |
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return -EBUSY; |
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sink_fmt = &vsca->sink_fmt; |
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crop_rect = &vsca->crop_rect; |
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} else { |
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sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); |
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crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); |
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} |
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/* |
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* Do not change the format of the source pad, |
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* it is propagated from the sink |
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*/ |
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if (VIMC_IS_SRC(fmt->pad)) { |
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fmt->format = *sink_fmt; |
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fmt->format.width = crop_rect->width * sca_mult; |
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fmt->format.height = crop_rect->height * sca_mult; |
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} else { |
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/* Set the new format in the sink pad */ |
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vimc_sca_adjust_sink_fmt(&fmt->format); |
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dev_dbg(vsca->ved.dev, "%s: sink format update: " |
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"old:%dx%d (0x%x, %d, %d, %d, %d) " |
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"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name, |
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/* old */ |
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sink_fmt->width, sink_fmt->height, sink_fmt->code, |
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sink_fmt->colorspace, sink_fmt->quantization, |
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sink_fmt->xfer_func, sink_fmt->ycbcr_enc, |
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/* new */ |
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fmt->format.width, fmt->format.height, fmt->format.code, |
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fmt->format.colorspace, fmt->format.quantization, |
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fmt->format.xfer_func, fmt->format.ycbcr_enc); |
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*sink_fmt = fmt->format; |
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/* Do the crop, but respect the current bounds */ |
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vimc_sca_adjust_sink_crop(crop_rect, sink_fmt); |
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} |
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return 0; |
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} |
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static int vimc_sca_get_selection(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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struct v4l2_subdev_selection *sel) |
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{ |
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struct vimc_sca_device *vsca = 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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if (VIMC_IS_SRC(sel->pad)) |
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return -EINVAL; |
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if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) { |
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sink_fmt = &vsca->sink_fmt; |
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crop_rect = &vsca->crop_rect; |
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} else { |
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sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); |
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crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); |
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} |
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switch (sel->target) { |
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case V4L2_SEL_TGT_CROP: |
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sel->r = *crop_rect; |
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break; |
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case V4L2_SEL_TGT_CROP_BOUNDS: |
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sel->r = vimc_sca_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 int vimc_sca_set_selection(struct v4l2_subdev *sd, |
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struct v4l2_subdev_pad_config *cfg, |
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struct v4l2_subdev_selection *sel) |
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{ |
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struct vimc_sca_device *vsca = 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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if (VIMC_IS_SRC(sel->pad)) |
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return -EINVAL; |
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if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) { |
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/* Do not change the format while stream is on */ |
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if (vsca->src_frame) |
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return -EBUSY; |
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crop_rect = &vsca->crop_rect; |
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sink_fmt = &vsca->sink_fmt; |
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} else { |
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crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0); |
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sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); |
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} |
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switch (sel->target) { |
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case V4L2_SEL_TGT_CROP: |
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/* Do the crop, but respect the current bounds */ |
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vimc_sca_adjust_sink_crop(&sel->r, sink_fmt); |
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*crop_rect = sel->r; |
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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 const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = { |
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.init_cfg = vimc_sca_init_cfg, |
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.enum_mbus_code = vimc_sca_enum_mbus_code, |
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.enum_frame_size = vimc_sca_enum_frame_size, |
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.get_fmt = vimc_sca_get_fmt, |
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.set_fmt = vimc_sca_set_fmt, |
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.get_selection = vimc_sca_get_selection, |
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.set_selection = vimc_sca_set_selection, |
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}; |
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static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable) |
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{ |
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struct vimc_sca_device *vsca = 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 (vsca->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(vsca->sink_fmt.code); |
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vsca->bpp = vpix->bpp; |
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/* Calculate the width in bytes of the src frame */ |
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vsca->src_line_size = vsca->crop_rect.width * |
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sca_mult * vsca->bpp; |
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/* Calculate the frame size of the source pad */ |
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frame_size = vsca->src_line_size * vsca->crop_rect.height * |
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sca_mult; |
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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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vsca->src_frame = vmalloc(frame_size); |
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if (!vsca->src_frame) |
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return -ENOMEM; |
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} else { |
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if (!vsca->src_frame) |
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return 0; |
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vfree(vsca->src_frame); |
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vsca->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_sca_video_ops = { |
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.s_stream = vimc_sca_s_stream, |
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}; |
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static const struct v4l2_subdev_ops vimc_sca_ops = { |
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.pad = &vimc_sca_pad_ops, |
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.video = &vimc_sca_video_ops, |
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}; |
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static void vimc_sca_fill_pix(u8 *const ptr, |
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const u8 *const pixel, |
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const unsigned int bpp) |
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{ |
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unsigned int i; |
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/* copy the pixel to the pointer */ |
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for (i = 0; i < bpp; i++) |
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ptr[i] = pixel[i]; |
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} |
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static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca, |
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unsigned int lin, unsigned int col, |
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const u8 *const sink_frame) |
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{ |
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const struct v4l2_rect crop_rect = vsca->crop_rect; |
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unsigned int i, j, index; |
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const u8 *pixel; |
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/* Point to the pixel value in position (lin, col) in the sink frame */ |
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index = VIMC_FRAME_INDEX(lin, col, |
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vsca->sink_fmt.width, |
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vsca->bpp); |
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pixel = &sink_frame[index]; |
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dev_dbg(vsca->ved.dev, |
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"sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n", |
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vsca->sd.name, lin, col, index); |
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/* point to the place we are going to put the first pixel |
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* in the scaled src frame |
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*/ |
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lin -= crop_rect.top; |
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col -= crop_rect.left; |
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index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult, |
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crop_rect.width * sca_mult, vsca->bpp); |
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dev_dbg(vsca->ved.dev, "sca: %s: scale_pix src pos %dx%d, index %d\n", |
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vsca->sd.name, lin * sca_mult, col * sca_mult, index); |
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/* Repeat this pixel mult times */ |
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for (i = 0; i < sca_mult; i++) { |
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/* Iterate through each beginning of a |
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* pixel repetition in a line |
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*/ |
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for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) { |
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dev_dbg(vsca->ved.dev, |
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"sca: %s: sca: scale_pix src pos %d\n", |
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vsca->sd.name, index + j); |
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/* copy the pixel to the position index + j */ |
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vimc_sca_fill_pix(&vsca->src_frame[index + j], |
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pixel, vsca->bpp); |
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} |
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/* move the index to the next line */ |
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index += vsca->src_line_size; |
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} |
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} |
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static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca, |
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const u8 *const sink_frame) |
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{ |
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const struct v4l2_rect r = vsca->crop_rect; |
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unsigned int i, j; |
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/* Scale each pixel from the original sink frame */ |
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/* TODO: implement scale down, only scale up is supported for now */ |
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for (i = r.top; i < r.top + r.height; i++) |
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for (j = r.left; j < r.left + r.width; j++) |
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vimc_sca_scale_pix(vsca, i, j, sink_frame); |
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} |
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static void *vimc_sca_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_sca_device *vsca = container_of(ved, struct vimc_sca_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 (!vsca->src_frame) |
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return ERR_PTR(-EINVAL); |
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vimc_sca_fill_src_frame(vsca, sink_frame); |
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return vsca->src_frame; |
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}; |
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static void vimc_sca_release(struct vimc_ent_device *ved) |
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{ |
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struct vimc_sca_device *vsca = |
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container_of(ved, struct vimc_sca_device, ved); |
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media_entity_cleanup(vsca->ved.ent); |
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kfree(vsca); |
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} |
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static struct vimc_ent_device *vimc_sca_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_sca_device *vsca; |
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int ret; |
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/* Allocate the vsca struct */ |
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vsca = kzalloc(sizeof(*vsca), GFP_KERNEL); |
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if (!vsca) |
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return ERR_PTR(-ENOMEM); |
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|
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/* Initialize ved and sd */ |
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vsca->pads[0].flags = MEDIA_PAD_FL_SINK; |
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vsca->pads[1].flags = MEDIA_PAD_FL_SOURCE; |
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ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev, |
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vcfg_name, |
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MEDIA_ENT_F_PROC_VIDEO_SCALER, 2, |
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vsca->pads, &vimc_sca_ops); |
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if (ret) { |
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kfree(vsca); |
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return ERR_PTR(ret); |
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} |
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vsca->ved.process_frame = vimc_sca_process_frame; |
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vsca->ved.dev = vimc->mdev.dev; |
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|
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/* Initialize the frame format */ |
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vsca->sink_fmt = sink_fmt_default; |
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|
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/* Initialize the crop selection */ |
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vsca->crop_rect = crop_rect_default; |
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return &vsca->ved; |
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} |
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struct vimc_ent_type vimc_sca_type = { |
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.add = vimc_sca_add, |
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.release = vimc_sca_release |
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};
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|