drivers/media/video/s5p-tv/mixer_grp_layer.c

/*
 * Samsung TV Mixer driver
 *
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *
 * Tomasz Stanislawski, <t.stanislaws@samsung.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 Foundiation. either version 2 of the License,
 * or (at your option) any later version
 */

#include "mixer.h"

#include <media/videobuf2-dma-contig.h>

/* FORMAT DEFINITIONS */

static const struct mxr_format mxr_fb_fmt_rgb565 = {
	.name = "RGB565",
	.fourcc = V4L2_PIX_FMT_RGB565,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.num_planes = 1,
	.plane = {
		{ .width = 1, .height = 1, .size = 2 },
	},
	.num_subframes = 1,
	.cookie = 4,
};

static const struct mxr_format mxr_fb_fmt_argb1555 = {
	.name = "ARGB1555",
	.num_planes = 1,
	.fourcc = V4L2_PIX_FMT_RGB555,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.plane = {
		{ .width = 1, .height = 1, .size = 2 },
	},
	.num_subframes = 1,
	.cookie = 5,
};

static const struct mxr_format mxr_fb_fmt_argb4444 = {
	.name = "ARGB4444",
	.num_planes = 1,
	.fourcc = V4L2_PIX_FMT_RGB444,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.plane = {
		{ .width = 1, .height = 1, .size = 2 },
	},
	.num_subframes = 1,
	.cookie = 6,
};

static const struct mxr_format mxr_fb_fmt_argb8888 = {
	.name = "ARGB8888",
	.fourcc = V4L2_PIX_FMT_BGR32,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.num_planes = 1,
	.plane = {
		{ .width = 1, .height = 1, .size = 4 },
	},
	.num_subframes = 1,
	.cookie = 7,
};

static const struct mxr_format *mxr_graph_format[] = {
	&mxr_fb_fmt_rgb565,
	&mxr_fb_fmt_argb1555,
	&mxr_fb_fmt_argb4444,
	&mxr_fb_fmt_argb8888,
};

/* AUXILIARY CALLBACKS */

static void mxr_graph_layer_release(struct mxr_layer *layer)
{
	mxr_base_layer_unregister(layer);
	mxr_base_layer_release(layer);
}

static void mxr_graph_buffer_set(struct mxr_layer *layer,
	struct mxr_buffer *buf)
{
	dma_addr_t addr = 0;

	if (buf)
		addr = vb2_dma_contig_plane_dma_addr(&buf->vb, 0);
	mxr_reg_graph_buffer(layer->mdev, layer->idx, addr);
}

static void mxr_graph_stream_set(struct mxr_layer *layer, int en)
{
	mxr_reg_graph_layer_stream(layer->mdev, layer->idx, en);
}

static void mxr_graph_format_set(struct mxr_layer *layer)
{
	mxr_reg_graph_format(layer->mdev, layer->idx,
		layer->fmt, &layer->geo);
}

static void mxr_graph_fix_geometry(struct mxr_layer *layer)
{
	struct mxr_geometry *geo = &layer->geo;

	/* limit to boundary size */
	geo->src.full_width = clamp_val(geo->src.full_width, 1, 32767);
	geo->src.full_height = clamp_val(geo->src.full_height, 1, 2047);
	geo->src.width = clamp_val(geo->src.width, 1, geo->src.full_width);
	geo->src.width = min(geo->src.width, 2047U);
	/* not possible to crop of Y axis */
	geo->src.y_offset = min(geo->src.y_offset, geo->src.full_height - 1);
	geo->src.height = geo->src.full_height - geo->src.y_offset;
	/* limitting offset */
	geo->src.x_offset = min(geo->src.x_offset,
		geo->src.full_width - geo->src.width);

	/* setting position in output */
	geo->dst.width = min(geo->dst.width, geo->dst.full_width);
	geo->dst.height = min(geo->dst.height, geo->dst.full_height);

	/* Mixer supports only 1x and 2x scaling */
	if (geo->dst.width >= 2 * geo->src.width) {
		geo->x_ratio = 1;
		geo->dst.width = 2 * geo->src.width;
	} else {
		geo->x_ratio = 0;
		geo->dst.width = geo->src.width;
	}

	if (geo->dst.height >= 2 * geo->src.height) {
		geo->y_ratio = 1;
		geo->dst.height = 2 * geo->src.height;
	} else {
		geo->y_ratio = 0;
		geo->dst.height = geo->src.height;
	}

	geo->dst.x_offset = min(geo->dst.x_offset,
		geo->dst.full_width - geo->dst.width);
	geo->dst.y_offset = min(geo->dst.y_offset,
		geo->dst.full_height - geo->dst.height);
}

/* PUBLIC API */

struct mxr_layer *mxr_graph_layer_create(struct mxr_device *mdev, int idx)
{
	struct mxr_layer *layer;
	int ret;
	struct mxr_layer_ops ops = {
		.release = mxr_graph_layer_release,
		.buffer_set = mxr_graph_buffer_set,
		.stream_set = mxr_graph_stream_set,
		.format_set = mxr_graph_format_set,
		.fix_geometry = mxr_graph_fix_geometry,
	};
	char name[32];

	sprintf(name, "graph%d", idx);

	layer = mxr_base_layer_create(mdev, idx, name, &ops);
	if (layer == NULL) {
		mxr_err(mdev, "failed to initialize layer(%d) base\n", idx);
		goto fail;
	}

	layer->fmt_array = mxr_graph_format;
	layer->fmt_array_size = ARRAY_SIZE(mxr_graph_format);

	ret = mxr_base_layer_register(layer);
	if (ret)
		goto fail_layer;

	return layer;

fail_layer:
	mxr_base_layer_release(layer);

fail:
	return NULL;
}