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/*
* TI ADS7846 / TSC2046 chip emulation.
*
* Copyright (c) 2006 Openedhand Ltd.
* Written by Andrzej Zaborowski <balrog@zabor.org>
*
* This code is licensed under the GNU GPL v2.
*/
#include "ssi.h"
#include "console.h"
typedef struct {
SSISlave ssidev;
qemu_irq interrupt;
int input[8];
int pressure;
int noise;
int cycle;
int output;
} ADS7846State;
/* Control-byte bitfields */
#define CB_PD0 (1 << 0)
#define CB_PD1 (1 << 1)
#define CB_SER (1 << 2)
#define CB_MODE (1 << 3)
#define CB_A0 (1 << 4)
#define CB_A1 (1 << 5)
#define CB_A2 (1 << 6)
#define CB_START (1 << 7)
#define X_AXIS_DMAX 3470
#define X_AXIS_MIN 290
#define Y_AXIS_DMAX 3450
#define Y_AXIS_MIN 200
#define ADS_VBAT 2000
#define ADS_VAUX 2000
#define ADS_TEMP0 2000
#define ADS_TEMP1 3000
#define ADS_XPOS(x, y) (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15))
#define ADS_YPOS(x, y) (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15))
#define ADS_Z1POS(x, y) 600
#define ADS_Z2POS(x, y) (600 + 6000 / ADS_XPOS(x, y))
static void ads7846_int_update(ADS7846State *s)
{
if (s->interrupt)
qemu_set_irq(s->interrupt, s->pressure == 0);
}
static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
{
ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
switch (s->cycle ++) {
case 0:
if (!(value & CB_START)) {
s->cycle = 0;
break;
}
s->output = s->input[(value >> 4) & 7];
/* Imitate the ADC noise, some drivers expect this. */
s->noise = (s->noise + 3) & 7;
switch ((value >> 4) & 7) {
case 1: s->output += s->noise ^ 2; break;
case 3: s->output += s->noise ^ 0; break;
case 4: s->output += s->noise ^ 7; break;
case 5: s->output += s->noise ^ 5; break;
}
if (value & CB_MODE)
s->output >>= 4; /* 8 bits instead of 12 */
break;
case 1:
s->cycle = 0;
break;
}
return s->output;
}
static void ads7846_ts_event(void *opaque,
int x, int y, int z, int buttons_state)
{
ADS7846State *s = opaque;
if (buttons_state) {
x = 0x7fff - x;
s->input[1] = ADS_XPOS(x, y);
s->input[3] = ADS_Z1POS(x, y);
s->input[4] = ADS_Z2POS(x, y);
s->input[5] = ADS_YPOS(x, y);
}
if (s->pressure == !buttons_state) {
s->pressure = !!buttons_state;
ads7846_int_update(s);
}
}
static int ads7856_post_load(void *opaque, int version_id)
{
ADS7846State *s = opaque;
s->pressure = 0;
ads7846_int_update(s);
return 0;
}
static const VMStateDescription vmstate_ads7846 = {
.name = "ads7846",
.version_id = 0,
.minimum_version_id = 0,
.minimum_version_id_old = 0,
.post_load = ads7856_post_load,
.fields = (VMStateField[]) {
VMSTATE_INT32_ARRAY(input, ADS7846State, 8),
VMSTATE_INT32(noise, ADS7846State),
VMSTATE_INT32(cycle, ADS7846State),
VMSTATE_INT32(output, ADS7846State),
VMSTATE_END_OF_LIST()
}
};
static int ads7846_init(SSISlave *dev)
{
ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
qdev_init_gpio_out(&dev->qdev, &s->interrupt, 1);
s->input[0] = ADS_TEMP0; /* TEMP0 */
s->input[2] = ADS_VBAT; /* VBAT */
s->input[6] = ADS_VAUX; /* VAUX */
s->input[7] = ADS_TEMP1; /* TEMP1 */
/* We want absolute coordinates */
qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
"QEMU ADS7846-driven Touchscreen");
ads7846_int_update(s);
vmstate_register(NULL, -1, &vmstate_ads7846, s);
return 0;
}
static SSISlaveInfo ads7846_info = {
.qdev.name ="ads7846",
.qdev.size = sizeof(ADS7846State),
.init = ads7846_init,
.transfer = ads7846_transfer
};
static void ads7846_register_devices(void)
{
ssi_register_slave(&ads7846_info);
}
device_init(ads7846_register_devices)
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