[media] vimc: deb: Add debayer filter

vimc-objs := vimc-core.o

vimc-objs := vimc-core.o

vimc_capture-objs := vimc-capture.o

vimc_capture-objs := vimc-capture.o

vimc_common-objs := vimc-common.o

vimc_common-objs := vimc-common.o

vimc_debayer-objs := vimc-debayer.o

vimc_sensor-objs := vimc-sensor.o

vimc_sensor-objs := vimc-sensor.o

obj-$(CONFIG_VIDEO_VIMC) += vimc.o vimc_capture.o vimc_common.o vimc_sensor.o

obj-$(CONFIG_VIDEO_VIMC) += vimc.o vimc_capture.o vimc_common.o vimc-debayer.o \

				vimc_sensor.o

#define VIMC_FRAME_MIN_WIDTH 16

#define VIMC_FRAME_MIN_WIDTH 16

#define VIMC_FRAME_MIN_HEIGHT 16

#define VIMC_FRAME_MIN_HEIGHT 16

#define VIMC_FRAME_INDEX(lin, col, width, bpp) ((lin * width + col) * bpp)

/**

/**

 * struct vimc_colorimetry_clamp - Adjust colorimetry parameters

 * struct vimc_colorimetry_clamp - Adjust colorimetry parameters

 *

 *

/*

 * vimc-debayer.c Virtual Media Controller Driver

 *

 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

#include <linux/component.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/vmalloc.h>

#include <linux/v4l2-mediabus.h>

#include <media/v4l2-subdev.h>

#include "vimc-common.h"

#define VIMC_DEB_DRV_NAME "vimc-debayer"

static unsigned int deb_mean_win_size = 3;

module_param(deb_mean_win_size, uint, 0000);

MODULE_PARM_DESC(deb_mean_win_size, " the window size to calculate the mean.\n"

	"NOTE: the window size need to be an odd number, as the main pixel "

	"stays in the center of the window, otherwise the next odd number "

	"is considered");

#define IS_SINK(pad) (!pad)

#define IS_SRC(pad)  (pad)

enum vimc_deb_rgb_colors {

	VIMC_DEB_RED = 0,

	VIMC_DEB_GREEN = 1,

	VIMC_DEB_BLUE = 2,

};

struct vimc_deb_pix_map {

	u32 code;

	enum vimc_deb_rgb_colors order[2][2];

};

struct vimc_deb_device {

	struct vimc_ent_device ved;

	struct v4l2_subdev sd;

	struct device *dev;

	/* The active format */

	struct v4l2_mbus_framefmt sink_fmt;

	u32 src_code;

	void (*set_rgb_src)(struct vimc_deb_device *vdeb, unsigned int lin,

			    unsigned int col, unsigned int rgb[3]);

	/* Values calculated when the stream starts */

	u8 *src_frame;

	const struct vimc_deb_pix_map *sink_pix_map;

	unsigned int sink_bpp;

};

static const struct v4l2_mbus_framefmt sink_fmt_default = {

	.width = 640,

	.height = 480,

	.code = MEDIA_BUS_FMT_RGB888_1X24,

	.field = V4L2_FIELD_NONE,

	.colorspace = V4L2_COLORSPACE_DEFAULT,

};

static const struct vimc_deb_pix_map vimc_deb_pix_map_list[] = {

	{

		.code = MEDIA_BUS_FMT_SBGGR8_1X8,

		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }

	},

	{

		.code = MEDIA_BUS_FMT_SGBRG8_1X8,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },

			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SGRBG8_1X8,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },

			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SRGGB8_1X8,

		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }

	},

	{

		.code = MEDIA_BUS_FMT_SBGGR10_1X10,

		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }

	},

	{

		.code = MEDIA_BUS_FMT_SGBRG10_1X10,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },

			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SGRBG10_1X10,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },

			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SRGGB10_1X10,

		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }

	},

	{

		.code = MEDIA_BUS_FMT_SBGGR12_1X12,

		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }

	},

	{

		.code = MEDIA_BUS_FMT_SGBRG12_1X12,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },

			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SGRBG12_1X12,

		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },

			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }

	},

	{

		.code = MEDIA_BUS_FMT_SRGGB12_1X12,

		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },

			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }

	},

};

static const struct vimc_deb_pix_map *vimc_deb_pix_map_by_code(u32 code)

{

	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(vimc_deb_pix_map_list); i++)

		if (vimc_deb_pix_map_list[i].code == code)

			return &vimc_deb_pix_map_list[i];

	return NULL;

}

static int vimc_deb_init_cfg(struct v4l2_subdev *sd,

			     struct v4l2_subdev_pad_config *cfg)

{

	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	struct v4l2_mbus_framefmt *mf;

	unsigned int i;

	mf = v4l2_subdev_get_try_format(sd, cfg, 0);

	*mf = sink_fmt_default;

	for (i = 1; i < sd->entity.num_pads; i++) {

		mf = v4l2_subdev_get_try_format(sd, cfg, i);

		*mf = sink_fmt_default;

		mf->code = vdeb->src_code;

	}

	return 0;

}

static int vimc_deb_enum_mbus_code(struct v4l2_subdev *sd,

				   struct v4l2_subdev_pad_config *cfg,

				   struct v4l2_subdev_mbus_code_enum *code)

{

	/* We only support one format for source pads */

	if (IS_SRC(code->pad)) {

		struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

		if (code->index)

			return -EINVAL;

		code->code = vdeb->src_code;

	} else {

		if (code->index >= ARRAY_SIZE(vimc_deb_pix_map_list))

			return -EINVAL;

		code->code = vimc_deb_pix_map_list[code->index].code;

	}

	return 0;

}

static int vimc_deb_enum_frame_size(struct v4l2_subdev *sd,

				    struct v4l2_subdev_pad_config *cfg,

				    struct v4l2_subdev_frame_size_enum *fse)

{

	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	if (fse->index)

		return -EINVAL;

	if (IS_SINK(fse->pad)) {

		const struct vimc_deb_pix_map *vpix =

			vimc_deb_pix_map_by_code(fse->code);

		if (!vpix)

			return -EINVAL;

	} else if (fse->code != vdeb->src_code) {

		return -EINVAL;

	}

	fse->min_width = VIMC_FRAME_MIN_WIDTH;

	fse->max_width = VIMC_FRAME_MAX_WIDTH;

	fse->min_height = VIMC_FRAME_MIN_HEIGHT;

	fse->max_height = VIMC_FRAME_MAX_HEIGHT;

	return 0;

}

static int vimc_deb_get_fmt(struct v4l2_subdev *sd,

			    struct v4l2_subdev_pad_config *cfg,

			    struct v4l2_subdev_format *fmt)

{

	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	/* Get the current sink format */

	fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ?

		      *v4l2_subdev_get_try_format(sd, cfg, 0) :

		      vdeb->sink_fmt;

	/* Set the right code for the source pad */

	if (IS_SRC(fmt->pad))

		fmt->format.code = vdeb->src_code;

	return 0;

}

static void vimc_deb_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)

{

	const struct vimc_deb_pix_map *vpix;

	/* Don't accept a code that is not on the debayer table */

	vpix = vimc_deb_pix_map_by_code(fmt->code);

	if (!vpix)

		fmt->code = sink_fmt_default.code;

	fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,

			     VIMC_FRAME_MAX_WIDTH) & ~1;

	fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,

			      VIMC_FRAME_MAX_HEIGHT) & ~1;

	if (fmt->field == V4L2_FIELD_ANY)

		fmt->field = sink_fmt_default.field;

	vimc_colorimetry_clamp(fmt);

}

static int vimc_deb_set_fmt(struct v4l2_subdev *sd,

			    struct v4l2_subdev_pad_config *cfg,

			    struct v4l2_subdev_format *fmt)

{

	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	struct v4l2_mbus_framefmt *sink_fmt;

	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {

		/* Do not change the format while stream is on */

		if (vdeb->src_frame)

			return -EBUSY;

		sink_fmt = &vdeb->sink_fmt;

	} else {

		sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);

	}

	/*

	 * Do not change the format of the source pad,

	 * it is propagated from the sink

	 */

	if (IS_SRC(fmt->pad)) {

		fmt->format = *sink_fmt;

		/* TODO: Add support for other formats */

		fmt->format.code = vdeb->src_code;

	} else {

		/* Set the new format in the sink pad */

		vimc_deb_adjust_sink_fmt(&fmt->format);

		dev_dbg(vdeb->dev, "%s: sink format update: "

			"old:%dx%d (0x%x, %d, %d, %d, %d) "

			"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vdeb->sd.name,

			/* old */

			sink_fmt->width, sink_fmt->height, sink_fmt->code,

			sink_fmt->colorspace, sink_fmt->quantization,

			sink_fmt->xfer_func, sink_fmt->ycbcr_enc,

			/* new */

			fmt->format.width, fmt->format.height, fmt->format.code,

			fmt->format.colorspace,	fmt->format.quantization,

			fmt->format.xfer_func, fmt->format.ycbcr_enc);

		*sink_fmt = fmt->format;

	}

	return 0;

}

static const struct v4l2_subdev_pad_ops vimc_deb_pad_ops = {

	.init_cfg		= vimc_deb_init_cfg,

	.enum_mbus_code		= vimc_deb_enum_mbus_code,

	.enum_frame_size	= vimc_deb_enum_frame_size,

	.get_fmt		= vimc_deb_get_fmt,

	.set_fmt		= vimc_deb_set_fmt,

};

static void vimc_deb_set_rgb_mbus_fmt_rgb888_1x24(struct vimc_deb_device *vdeb,

						  unsigned int lin,

						  unsigned int col,

						  unsigned int rgb[3])

{

	unsigned int i, index;

	index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);

	for (i = 0; i < 3; i++)

		vdeb->src_frame[index + i] = rgb[i];

}

static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)

{

	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	int ret;

	if (enable) {

		const struct vimc_pix_map *vpix;

		unsigned int frame_size;

		if (vdeb->src_frame)

			return 0;

		/* Calculate the frame size of the source pad */

		vpix = vimc_pix_map_by_code(vdeb->src_code);

		frame_size = vdeb->sink_fmt.width * vdeb->sink_fmt.height *

				vpix->bpp;

		/* Save the bytes per pixel of the sink */

		vpix = vimc_pix_map_by_code(vdeb->sink_fmt.code);

		vdeb->sink_bpp = vpix->bpp;

		/* Get the corresponding pixel map from the table */

		vdeb->sink_pix_map =

			vimc_deb_pix_map_by_code(vdeb->sink_fmt.code);

		/*

		 * Allocate the frame buffer. Use vmalloc to be able to

		 * allocate a large amount of memory

		 */

		vdeb->src_frame = vmalloc(frame_size);

		if (!vdeb->src_frame)

			return -ENOMEM;

		/* Turn the stream on in the subdevices directly connected */

		ret = vimc_pipeline_s_stream(&vdeb->sd.entity, 1);

		if (ret) {

			vfree(vdeb->src_frame);

			vdeb->src_frame = NULL;

			return ret;

		}

	} else {

		if (!vdeb->src_frame)

			return 0;

		/* Disable streaming from the pipe */

		ret = vimc_pipeline_s_stream(&vdeb->sd.entity, 0);

		if (ret)

			return ret;

		vfree(vdeb->src_frame);

		vdeb->src_frame = NULL;

	}

	return 0;

}

static struct v4l2_subdev_video_ops vimc_deb_video_ops = {

	.s_stream = vimc_deb_s_stream,

};

static const struct v4l2_subdev_ops vimc_deb_ops = {

	.pad = &vimc_deb_pad_ops,

	.video = &vimc_deb_video_ops,

};

static unsigned int vimc_deb_get_val(const u8 *bytes,

				     const unsigned int n_bytes)

{

	unsigned int i;

	unsigned int acc = 0;

	for (i = 0; i < n_bytes; i++)

		acc = acc + (bytes[i] << (8 * i));

	return acc;

}

static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb,

				   const u8 *frame,

				   const unsigned int lin,

				   const unsigned int col,

				   unsigned int rgb[3])

{

	unsigned int i, seek, wlin, wcol;

	unsigned int n_rgb[3] = {0, 0, 0};

	for (i = 0; i < 3; i++)

		rgb[i] = 0;

	/*

	 * Calculate how many we need to subtract to get to the pixel in

	 * the top left corner of the mean window (considering the current

	 * pixel as the center)

	 */

	seek = deb_mean_win_size / 2;

	/* Sum the values of the colors in the mean window */

	dev_dbg(vdeb->dev,

		"deb: %s: --- Calc pixel %dx%d, window mean %d, seek %d ---\n",

		vdeb->sd.name, lin, col, vdeb->sink_fmt.height, seek);

	/*

	 * Iterate through all the lines in the mean window, start

	 * with zero if the pixel is outside the frame and don't pass

	 * the height when the pixel is in the bottom border of the

	 * frame

	 */

	for (wlin = seek > lin ? 0 : lin - seek;

	     wlin < lin + seek + 1 && wlin < vdeb->sink_fmt.height;

	     wlin++) {

		/*

		 * Iterate through all the columns in the mean window, start

		 * with zero if the pixel is outside the frame and don't pass

		 * the width when the pixel is in the right border of the

		 * frame

		 */

		for (wcol = seek > col ? 0 : col - seek;

		     wcol < col + seek + 1 && wcol < vdeb->sink_fmt.width;

		     wcol++) {

			enum vimc_deb_rgb_colors color;

			unsigned int index;

			/* Check which color this pixel is */

			color = vdeb->sink_pix_map->order[wlin % 2][wcol % 2];

			index = VIMC_FRAME_INDEX(wlin, wcol,

						 vdeb->sink_fmt.width,

						 vdeb->sink_bpp);

			dev_dbg(vdeb->dev,

				"deb: %s: RGB CALC: frame index %d, win pos %dx%d, color %d\n",

				vdeb->sd.name, index, wlin, wcol, color);

			/* Get its value */

			rgb[color] = rgb[color] +

				vimc_deb_get_val(&frame[index], vdeb->sink_bpp);

			/* Save how many values we already added */

			n_rgb[color]++;

			dev_dbg(vdeb->dev, "deb: %s: RGB CALC: val %d, n %d\n",

				vdeb->sd.name, rgb[color], n_rgb[color]);

		}

	}

	/* Calculate the mean */

	for (i = 0; i < 3; i++) {

		dev_dbg(vdeb->dev,

			"deb: %s: PRE CALC: %dx%d Color %d, val %d, n %d\n",

			vdeb->sd.name, lin, col, i, rgb[i], n_rgb[i]);

		if (n_rgb[i])

			rgb[i] = rgb[i] / n_rgb[i];

		dev_dbg(vdeb->dev,

			"deb: %s: FINAL CALC: %dx%d Color %d, val %d\n",

			vdeb->sd.name, lin, col, i, rgb[i]);

	}

}

static void vimc_deb_process_frame(struct vimc_ent_device *ved,

				   struct media_pad *sink,

				   const void *sink_frame)

{

	struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,

						    ved);

	unsigned int rgb[3];

	unsigned int i, j;

	/* If the stream in this node is not active, just return */

	if (!vdeb->src_frame)

		return;

	for (i = 0; i < vdeb->sink_fmt.height; i++)

		for (j = 0; j < vdeb->sink_fmt.width; j++) {

			vimc_deb_calc_rgb_sink(vdeb, sink_frame, i, j, rgb);

			vdeb->set_rgb_src(vdeb, i, j, rgb);

		}

	/* Propagate the frame through all source pads */

	for (i = 1; i < vdeb->sd.entity.num_pads; i++) {

		struct media_pad *pad = &vdeb->sd.entity.pads[i];

		vimc_propagate_frame(pad, vdeb->src_frame);

	}

}

static void vimc_deb_comp_unbind(struct device *comp, struct device *master,

				 void *master_data)

{

	struct vimc_ent_device *ved = dev_get_drvdata(comp);

	struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,

						    ved);

	vimc_ent_sd_unregister(ved, &vdeb->sd);

	kfree(vdeb);

}

static int vimc_deb_comp_bind(struct device *comp, struct device *master,

			      void *master_data)

{

	struct v4l2_device *v4l2_dev = master_data;

	struct vimc_platform_data *pdata = comp->platform_data;

	struct vimc_deb_device *vdeb;

	int ret;

	/* Allocate the vdeb struct */

	vdeb = kzalloc(sizeof(*vdeb), GFP_KERNEL);

	if (!vdeb)

		return -ENOMEM;

	/* Initialize ved and sd */

	ret = vimc_ent_sd_register(&vdeb->ved, &vdeb->sd, v4l2_dev,

				   pdata->entity_name,

				   MEDIA_ENT_F_ATV_DECODER, 2,

				   (const unsigned long[2]) {MEDIA_PAD_FL_SINK,

				   MEDIA_PAD_FL_SOURCE},

				   &vimc_deb_ops);

	if (ret) {

		kfree(vdeb);

		return ret;

	}

	vdeb->ved.process_frame = vimc_deb_process_frame;

	dev_set_drvdata(comp, &vdeb->ved);

	vdeb->dev = comp;

	/* Initialize the frame format */

	vdeb->sink_fmt = sink_fmt_default;

	/*

	 * TODO: Add support for more output formats, we only support

	 * RGB888 for now

	 * NOTE: the src format is always the same as the sink, except

	 * for the code

	 */

	vdeb->src_code = MEDIA_BUS_FMT_RGB888_1X24;

	vdeb->set_rgb_src = vimc_deb_set_rgb_mbus_fmt_rgb888_1x24;

	return 0;

}

static const struct component_ops vimc_deb_comp_ops = {

	.bind = vimc_deb_comp_bind,

	.unbind = vimc_deb_comp_unbind,

};

static int vimc_deb_probe(struct platform_device *pdev)

{

	return component_add(&pdev->dev, &vimc_deb_comp_ops);

}

static int vimc_deb_remove(struct platform_device *pdev)

{

	component_del(&pdev->dev, &vimc_deb_comp_ops);

	return 0;

}

static struct platform_driver vimc_deb_pdrv = {

	.probe		= vimc_deb_probe,

	.remove		= vimc_deb_remove,

	.driver		= {

		.name	= VIMC_DEB_DRV_NAME,

	},

};

static const struct platform_device_id vimc_deb_driver_ids[] = {

	{

		.name           = VIMC_DEB_DRV_NAME,

	},

	{ }

};

module_platform_driver(vimc_deb_pdrv);

MODULE_DEVICE_TABLE(platform, vimc_deb_driver_ids);

MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Debayer");

MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");

MODULE_LICENSE("GPL");