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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 by Rob Purchase, Carsten Schreiter, Jonas Aaberg
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "button.h"
#include "pcf50606.h"
#include "touchscreen.h"
#include "stdlib.h"
#include "power-target.h"
#include "tsc200x.h"
#define NO_OF_TOUCH_DATA 5
static bool touch_available = false;
static short x[NO_OF_TOUCH_DATA], y[NO_OF_TOUCH_DATA];
/* comparator for qsort */
static int short_cmp(const void *a, const void *b)
{
return *(short*)a - *(short*)b;
}
static int touch_to_pixels(short val_x, short val_y)
{
int x = (val_x * LCD_WIDTH) >> 10;
int y = (val_y * LCD_HEIGHT) >> 10;
if (x < 0)
x = 0;
else if (x >= LCD_WIDTH)
x = LCD_WIDTH - 1;
if (y < 0)
y = 0;
else if (y >= LCD_HEIGHT)
y = LCD_HEIGHT - 1;
return (x << 16) | y;
}
static int touchscreen_read_pcf50606(int *data, int *old_data)
{
int btn = BUTTON_NONE;
static bool touch_hold = false;
static long last_touch = 0;
if (touch_available || touch_hold)
{
short x_touch, y_touch;
static short last_x = 0, last_y = 0;
if (touch_hold)
{
/* get rid of very fast unintended double touches */
x_touch = last_x;
y_touch = last_y;
}
else
{
/* sort the 5 data taken and use the median value */
qsort(x, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
qsort(y, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
x_touch = last_x = x[(NO_OF_TOUCH_DATA - 1)/2];
y_touch = last_y = y[(NO_OF_TOUCH_DATA - 1)/2];
last_touch = current_tick;
touch_hold = true;
touch_available = false;
}
*old_data = *data = touch_to_pixels(x_touch, y_touch);
btn |= touchscreen_to_pixels((*data&0xffff0000) >> 16,
(*data&0x0000ffff),
data);
}
if (TIME_AFTER(current_tick, last_touch + 10))
{
/* put the touchscreen back into interrupt mode */
touch_hold = false;
pcf50606_write(PCF5060X_ADCC1, 1);
}
return btn;
}
static int touchscreen_read_tsc200x(int *data, int *old_data)
{
int btn = BUTTON_NONE;
short x_touch, y_touch;
static long last_read = 0;
static int last_btn = BUTTON_NONE;
/* Don't read hw every check button round. I2C is slow
* and man is even slower. */
if (TIME_BEFORE(current_tick, last_read + 10))
{
*data = *old_data;
return last_btn;
}
if (tsc200x_is_pressed())
{
if (tsc200x_read_coords(&x_touch, &y_touch))
{
*old_data = *data = touch_to_pixels(x_touch, y_touch);
btn = touchscreen_to_pixels((*data & 0xffff0000) >> 16,
(*data & 0x0000ffff),
data);
}
}
last_read = current_tick;
last_btn = btn;
return btn;
}
void touchscreen_init_device(void)
{
touch_available = false;
if (get_pmu_type() != PCF50606)
{
tsc200x_init();
}
}
void touchscreen_handle_device_irq(void)
{
static long last_touch_interrupt = 0;
static int touch_data_index = 0;
/* don't read the coordinates when hold is enabled */
if (button_hold()) return;
/* put the touchscreen into idle mode */
pcf50606_write(PCF5060X_ADCC1, 0);
if (TIME_AFTER(current_tick, last_touch_interrupt + 1))
{
/* resets the index if the last touch could not be read 5 times */
touch_data_index = 0;
}
/* here the touch coordinates are read 5 times */
/* they will be sorted and the middle one will be used */
pcf50606_read_adc(PCF5060X_ADC_TSC_XY,
&x[touch_data_index], &y[touch_data_index]);
touch_data_index++;
if (touch_data_index > NO_OF_TOUCH_DATA - 1)
{
/* coordinates 5 times read */
touch_available = true;
touch_data_index = 0;
}
else
{
/* put the touchscreen back into the interrupt mode */
pcf50606_write(PCF5060X_ADCC1, 1);
}
last_touch_interrupt = current_tick;
}
int touchscreen_read_device(int *data, int *old_data)
{
int btn;
if (get_pmu_type() == PCF50606)
btn = touchscreen_read_pcf50606(data, old_data);
else
btn = touchscreen_read_tsc200x(data, old_data);
return btn;
}
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