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/* adc.c - WM8143-12 ADC I/O functions
*
* Copyright (C) 2004, 2005 Anderson Lizardo
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "geniusvp2-adc.h"
#include "geniusvp2-asic.h"
#include "geniusvp2-misc.h"
#define DARK_REF_LINES 5
/*
* Write data to the specified ADC register
*/
static void
adc_write (unsigned char reg, unsigned char data)
{
int bit;
reg13.w = 0x80;
sane_geniusvp2_reg_write (13, reg13.w);
for (bit = 5; bit >= 0; bit--)
{
if (reg & (1 << bit))
reg13.r.SDO = 1;
else
reg13.r.SDO = 0;
sane_geniusvp2_reg_write (13, reg13.w);
reg13.r.SCLK = 1;
sane_geniusvp2_reg_write (13, reg13.w);
reg13.r.SCLK = 0;
sane_geniusvp2_reg_write (13, reg13.w);
}
for (bit = 7; bit >= 0; bit--)
{
if (data & (1 << bit))
reg13.r.SDO = 1;
else
reg13.r.SDO = 0;
sane_geniusvp2_reg_write (13, reg13.w);
reg13.r.SCLK = 1;
sane_geniusvp2_reg_write (13, reg13.w);
reg13.r.SCLK = 0;
sane_geniusvp2_reg_write (13, reg13.w);
}
reg13.r.SEN = 1;
sane_geniusvp2_reg_write (13, reg13.w);
reg13.r.SDO = 0;
reg13.r.SEN = 0;
sane_geniusvp2_reg_write (13, reg13.w);
}
/*
* Set offset value
* xoff = -255 .. +255
*/
static void
set_adc_offset (int roff, int goff, int boff)
{
/* Set DAC Signs register */
if (roff < 0)
adc_write (0x24, 1);
else
adc_write (0x24, 0);
if (goff < 0)
adc_write (0x25, 1);
else
adc_write (0x25, 0);
if (boff < 0)
adc_write (0x26, 1);
else
adc_write (0x26, 0);
if (roff < 0)
roff = -roff;
if (goff < 0)
goff = -goff;
if (boff < 0)
boff = -boff;
/* Set DAC Values register */
adc_write (0x20, roff & 0xff);
adc_write (0x21, goff & 0xff);
adc_write (0x22, boff & 0xff);
sane_geniusvp2_reg_write (13, 0x20);
}
/*
* Set Programmable Gain Amplifier
*/
void
sane_geniusvp2_set_adc_gain (int rgain, int ggain, int bgain)
{
adc_write (0x28, rgain & 0x1f);
adc_write (0x29, ggain & 0x1f);
adc_write (0x2a, bgain & 0x1f);
sane_geniusvp2_reg_write (13, 0x20);
}
/*
* Initialize ADC
*/
void
sane_geniusvp2_init_adc (void)
{
sane_geniusvp2_reg_write (5, 0x90);
sane_geniusvp2_reg_write (25, 0x0f);
/* Clear panel button */
sane_geniusvp2_reg_read (12, ®12.w);
reg12.r.KeyButton = 0;
sane_geniusvp2_reg_write (12, reg12.w);
adc_write (0x01, 0x03);
adc_write (0x02, 0x04);
adc_write (0x03, 0x22);
adc_write (0x05, 0x10);
set_adc_offset (190, 190, 190);
sane_geniusvp2_set_adc_gain (2, 2, 2);
}
/*
* Adjust offset to get a reading in the range 1 to 10
*/
void
sane_geniusvp2_adjust_offset (void)
{
int offsetr = 0;
int offsetg = 0;
int offsetb = 0;
int mask, rtmp, gtmp, btmp;
set_adc_offset (offsetr, offsetg, offsetb);
for (mask = 0x80; mask != 0x00; mask = mask >> 1)
{
sane_geniusvp2_get_avg_reading (&rtmp, >mp, &btmp);
if (rtmp < 1)
offsetr = offsetr - mask;
else if (rtmp > 10)
offsetr = offsetr + mask;
if (gtmp < 1)
offsetg = offsetg - mask;
else if (gtmp > 10)
offsetg = offsetg + mask;
if (btmp < 1)
offsetb = offsetb - mask;
else if (btmp > 10)
offsetb = offsetb + mask;
set_adc_offset (offsetr, offsetg, offsetb);
}
}
/*
* Get an average color reading
*/
void
sane_geniusvp2_get_avg_reading (int *red, int *green, int *blue)
{
int i, j;
ScanArea area;
area.top = 0;
area.left = 6;
area.height = DARK_REF_LINES;
area.width = 7;
/*sane_geniusvp2_lamp_off (); */
sane_geniusvp2_set_scan_area (area);
sane_geniusvp2_set_scan_params (600);
sane_geniusvp2_reset_fifo ();
sane_geniusvp2_set_operation_mode (mStop);
sane_geniusvp2_set_operation_mode (mScanMotorOff);
/* Read ADC to get average values */
*red = *green = *blue = 0;
for (i = 0; i < DARK_REF_LINES; i++)
{
sane_geniusvp2_wait_fifo (area.width);
for (j = 0; j < area.width; j++)
{
sane_geniusvp2_reg_read (17, ®17.w);
*red += reg17.w;
sane_geniusvp2_reg_read (17, ®17.w);
*green += reg17.w;
sane_geniusvp2_reg_read (17, ®17.w);
*blue += reg17.w;
}
}
*red /= (area.width * DARK_REF_LINES);
*green /= (area.width * DARK_REF_LINES);
*blue /= (area.width * DARK_REF_LINES);
sane_geniusvp2_set_operation_mode (mStop);
/*sane_geniusvp2_lamp_on (); */
}
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