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/*
* OMAP3 ISP library - OMAP3 ISP controls
*
* Copyright (C) 2010-2011 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/ioctl.h>
#include <sys/time.h>
#include <linux/omap3isp.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "controls.h"
#include "omap3isp.h"
#include "omap3isp-priv.h"
#include "subdev.h"
/* -----------------------------------------------------------------------------
* Matrix algebra helper functions
*/
struct matrix {
float coeff[3][3];
};
static void matrix_zero(struct matrix *m)
{
unsigned int i, j;
for (i = 0; i < 3; ++i) {
for (j = 0; j < 3; ++j)
m->coeff[i][j] = 0.0;
}
}
static void matrix_invert(struct matrix *m)
{
/* Invert the matrix using the transpose of the matrix of cofactors. The
* Gauss-Jordan elimination would be faster in the general case, but we
* know that the matrix is 3x3.
*/
const float eps = 1e-6;
struct matrix out;
unsigned int i, j;
float det;
out.coeff[0][0] = m->coeff[1][1] * m->coeff[2][2]
- m->coeff[1][2] * m->coeff[2][1];
out.coeff[0][1] = m->coeff[0][2] * m->coeff[2][1]
- m->coeff[0][1] * m->coeff[2][2];
out.coeff[0][2] = m->coeff[0][1] * m->coeff[1][2]
- m->coeff[0][2] * m->coeff[1][1];
out.coeff[1][0] = m->coeff[1][2] * m->coeff[2][0]
- m->coeff[1][0] * m->coeff[2][2];
out.coeff[1][1] = m->coeff[0][0] * m->coeff[2][2]
- m->coeff[0][2] * m->coeff[2][0];
out.coeff[1][2] = m->coeff[0][2] * m->coeff[1][0]
- m->coeff[0][0] * m->coeff[1][2];
out.coeff[2][0] = m->coeff[1][0] * m->coeff[2][1]
- m->coeff[1][1] * m->coeff[2][0];
out.coeff[2][1] = m->coeff[0][1] * m->coeff[2][0]
- m->coeff[0][0] * m->coeff[2][1];
out.coeff[2][2] = m->coeff[0][0] * m->coeff[1][1]
- m->coeff[1][0] * m->coeff[0][1];
det = m->coeff[0][0] * out.coeff[0][0] +
m->coeff[0][1] * out.coeff[1][0] +
m->coeff[0][2] * out.coeff[2][0];
if (det < eps)
return;
det = 1/det;
for (i = 0; i < 3; ++i)
for (j = 0; j < 3; ++j)
m->coeff[i][j] = out.coeff[i][j] * det;
}
static void matrix_multiply(struct matrix *a, const struct matrix *b)
{
struct matrix out;
/* Compute a * b and return the result in a. */
out.coeff[0][0] = a->coeff[0][0] * b->coeff[0][0]
+ a->coeff[0][1] * b->coeff[1][0]
+ a->coeff[0][2] * b->coeff[2][0];
out.coeff[0][1] = a->coeff[0][0] * b->coeff[0][1]
+ a->coeff[0][1] * b->coeff[1][1]
+ a->coeff[0][2] * b->coeff[2][1];
out.coeff[0][2] = a->coeff[0][0] * b->coeff[0][2]
+ a->coeff[0][1] * b->coeff[1][2]
+ a->coeff[0][2] * b->coeff[2][2];
out.coeff[1][0] = a->coeff[1][0] * b->coeff[0][0]
+ a->coeff[1][1] * b->coeff[1][0]
+ a->coeff[1][2] * b->coeff[2][0];
out.coeff[1][1] = a->coeff[1][0] * b->coeff[0][1]
+ a->coeff[1][1] * b->coeff[1][1]
+ a->coeff[1][2] * b->coeff[2][1];
out.coeff[1][2] = a->coeff[1][0] * b->coeff[0][2]
+ a->coeff[1][1] * b->coeff[1][2]
+ a->coeff[1][2] * b->coeff[2][2];
out.coeff[2][0] = a->coeff[2][0] * b->coeff[0][0]
+ a->coeff[2][1] * b->coeff[1][0]
+ a->coeff[2][2] * b->coeff[2][0];
out.coeff[2][1] = a->coeff[2][0] * b->coeff[0][1]
+ a->coeff[2][1] * b->coeff[1][1]
+ a->coeff[2][2] * b->coeff[2][1];
out.coeff[2][2] = a->coeff[2][0] * b->coeff[0][2]
+ a->coeff[2][1] * b->coeff[1][2]
+ a->coeff[2][2] * b->coeff[2][2];
*a = out;
}
static void matrix_float_to_s10q8(__u16 out[3][3], const struct matrix *in)
{
unsigned int i, j;
for (i = 0; i < 3; ++i) {
for (j = 0; j < 3; ++j)
out[i][j] = (__u16)((__s16)(in->coeff[i][j] * 256) & 0x3ff);
}
}
static void matrix_float_to_s12q8(__u16 out[3][3], const struct matrix *in)
{
unsigned int i, j;
for (i = 0; i < 3; ++i) {
for (j = 0; j < 3; ++j)
out[i][j] = (__u16)((__s16)(in->coeff[i][j] * 256) & 0xfff);
}
}
/* -----------------------------------------------------------------------------
* Preview engine parameters configuration
*/
static const struct matrix omap3isp_preview_csc = {
.coeff = {
/* Default values. */
{ 0.2968750, 0.5937500, 0.1093750 },
{ -0.1718750, -0.3281250, 0.5000000 },
{ 0.5000000, -0.3828125, -0.0781250 },
#if 0
/* Default values for fluorescent light. */
{ 0.25781250, 0.50390625, 0.09765625 },
{ -0.14843750, -0.29296875, 0.43750000 },
{ 0.43750000, -0.36718750, -0.07031250 },
#endif
},
};
static const struct matrix omap3isp_preview_rgb2rgb = {
.coeff = {
/* Default values. */
{ 1.0, 0.0, 0.0 },
{ 0.0, 1.0, 0.0 },
{ 0.0, 0.0, 1.0 },
#if 0
/* Default values for fluorescent light. */
{ 1.88281250, -0.812500, -0.07031250 },
{ -0.39453125, 1.671875, -0.27734375 },
{ -0.12500000, -1.250000, 2.37500000 },
#endif
},
};
int omap3_isp_preview_setup(struct omap3_isp_device *isp)
{
struct omap3isp_prev_update_config config;
struct omap3isp_prev_rgbtorgb rgb2rgb;
struct omap3isp_prev_csc csc;
int ret;
memset(&config, 0, sizeof config);
config.update = OMAP3ISP_PREV_RGB2RGB | OMAP3ISP_PREV_COLOR_CONV;
config.flag = OMAP3ISP_PREV_RGB2RGB | OMAP3ISP_PREV_COLOR_CONV;
config.rgb2rgb = &rgb2rgb;
config.csc = &csc;
memset(&rgb2rgb, 0, sizeof rgb2rgb);
matrix_float_to_s12q8(rgb2rgb.matrix, &omap3isp_preview_rgb2rgb);
memset(&csc, 0, sizeof csc);
matrix_float_to_s10q8(csc.matrix, &omap3isp_preview_csc);
v4l2_subdev_open(isp->preview);
ret = ioctl(isp->preview->fd, VIDIOC_OMAP3ISP_PRV_CFG, &config);
if (ret < 0)
return -errno;
return ret;
}
int omap3_isp_preview_set_contrast(struct omap3_isp_device *isp, unsigned int value)
{
int contrast = value;
int ret;
ret = v4l2_subdev_set_control(isp->preview, V4L2_CID_CONTRAST, &contrast);
if (ret < 0)
return -errno;
return ret;
}
int omap3_isp_preview_set_saturation(struct omap3_isp_device *isp, float value)
{
struct omap3isp_prev_update_config config;
struct omap3isp_prev_rgbtorgb rgb2rgb;
struct matrix saturation;
struct matrix gain;
int ret;
matrix_zero(&gain);
gain.coeff[0][0] = 1.0;
gain.coeff[1][1] = value;
gain.coeff[2][2] = value;
saturation = omap3isp_preview_csc;
matrix_invert(&saturation);
matrix_multiply(&saturation, &gain);
matrix_multiply(&saturation, &omap3isp_preview_csc);
memset(&config, 0, sizeof config);
config.update = OMAP3ISP_PREV_RGB2RGB;
config.flag = OMAP3ISP_PREV_RGB2RGB;
config.rgb2rgb = &rgb2rgb;
memset(&rgb2rgb, 0, sizeof rgb2rgb);
matrix_float_to_s12q8(rgb2rgb.matrix, &saturation);
ret = ioctl(isp->preview->fd, VIDIOC_OMAP3ISP_PRV_CFG, &config);
if (ret < 0)
return -errno;
return ret;
}
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