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/*
* Support for Intel Camera Imaging ISP subsystem.
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 "tag.h"
#include <platform_support.h> /* NULL */
#include <assert_support.h>
#include "tag_local.h"
/*
* @brief Creates the tag description from the given parameters.
* @param[in] num_captures
* @param[in] skip
* @param[in] offset
* @param[out] tag_descr
*/
void
sh_css_create_tag_descr(int num_captures,
unsigned int skip,
int offset,
unsigned int exp_id,
struct sh_css_tag_descr *tag_descr)
{
assert(tag_descr != NULL);
tag_descr->num_captures = num_captures;
tag_descr->skip = skip;
tag_descr->offset = offset;
tag_descr->exp_id = exp_id;
}
/*
* @brief Encodes the members of tag description into a 32-bit value.
* @param[in] tag Pointer to the tag description
* @return (unsigned int) Encoded 32-bit tag-info
*/
unsigned int
sh_css_encode_tag_descr(struct sh_css_tag_descr *tag)
{
int num_captures;
unsigned int num_captures_sign;
unsigned int skip;
int offset;
unsigned int offset_sign;
unsigned int exp_id;
unsigned int encoded_tag;
assert(tag != NULL);
if (tag->num_captures < 0) {
num_captures = -tag->num_captures;
num_captures_sign = 1;
} else {
num_captures = tag->num_captures;
num_captures_sign = 0;
}
skip = tag->skip;
if (tag->offset < 0) {
offset = -tag->offset;
offset_sign = 1;
} else {
offset = tag->offset;
offset_sign = 0;
}
exp_id = tag->exp_id;
if (exp_id != 0)
{
/* we encode either an exp_id or capture data */
assert((num_captures == 0) && (skip == 0) && (offset == 0));
encoded_tag = TAG_EXP | (exp_id & 0xFF) << TAG_EXP_ID_SHIFT;
}
else
{
encoded_tag = TAG_CAP
| ((num_captures_sign & 0x00000001) << TAG_NUM_CAPTURES_SIGN_SHIFT)
| ((offset_sign & 0x00000001) << TAG_OFFSET_SIGN_SHIFT)
| ((num_captures & 0x000000FF) << TAG_NUM_CAPTURES_SHIFT)
| ((skip & 0x000000FF) << TAG_OFFSET_SHIFT)
| ((offset & 0x000000FF) << TAG_SKIP_SHIFT);
}
return encoded_tag;
}
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