In order to use inclusive terminology, rename SSI 'slave' as 'peripheral', following the specification resolution: https://www.oshwa.org/a-resolution-to-redefine-spi-signal-names/ Patch created mechanically using: $ sed -i s/SSISlave/SSIPeripheral/ $(git grep -l SSISlave) $ sed -i s/SSI_SLAVE/SSI_PERIPHERAL/ $(git grep -l SSI_SLAVE) $ sed -i s/ssi-slave/ssi-peripheral/ $(git grep -l ssi-slave) $ sed -i s/ssi_slave/ssi_peripheral/ $(git grep -l ssi_slave) $ sed -i s/ssi_create_slave/ssi_create_peripheral/ \ $(git grep -l ssi_create_slave) Then in VMStateDescription vmstate_ssi_peripheral we restored the "SSISlave" migration stream name (to avoid breaking migration). Finally the following files have been manually tweaked: - hw/ssi/pl022.c - hw/ssi/xilinx_spips.c Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20201012124955.3409127-4-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Contributions after 2012-01-13 are licensed under the terms of the
|
|
* GNU GPL, version 2 or (at your option) any later version.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "hw/irq.h"
|
|
#include "hw/ssi/ssi.h"
|
|
#include "migration/vmstate.h"
|
|
#include "qemu/module.h"
|
|
#include "ui/console.h"
|
|
#include "qom/object.h"
|
|
|
|
struct ADS7846State {
|
|
SSIPeripheral ssidev;
|
|
qemu_irq interrupt;
|
|
|
|
int input[8];
|
|
int pressure;
|
|
int noise;
|
|
|
|
int cycle;
|
|
int output;
|
|
};
|
|
|
|
#define TYPE_ADS7846 "ads7846"
|
|
OBJECT_DECLARE_SIMPLE_TYPE(ADS7846State, ADS7846)
|
|
|
|
/* 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(SSIPeripheral *dev, uint32_t value)
|
|
{
|
|
ADS7846State *s = ADS7846(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 = 1,
|
|
.minimum_version_id = 1,
|
|
.post_load = ads7856_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_SSI_PERIPHERAL(ssidev, ADS7846State),
|
|
VMSTATE_INT32_ARRAY(input, ADS7846State, 8),
|
|
VMSTATE_INT32(noise, ADS7846State),
|
|
VMSTATE_INT32(cycle, ADS7846State),
|
|
VMSTATE_INT32(output, ADS7846State),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static void ads7846_realize(SSIPeripheral *d, Error **errp)
|
|
{
|
|
DeviceState *dev = DEVICE(d);
|
|
ADS7846State *s = ADS7846(d);
|
|
|
|
qdev_init_gpio_out(dev, &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, VMSTATE_INSTANCE_ID_ANY, &vmstate_ads7846, s);
|
|
}
|
|
|
|
static void ads7846_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass);
|
|
|
|
k->realize = ads7846_realize;
|
|
k->transfer = ads7846_transfer;
|
|
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
|
|
}
|
|
|
|
static const TypeInfo ads7846_info = {
|
|
.name = TYPE_ADS7846,
|
|
.parent = TYPE_SSI_PERIPHERAL,
|
|
.instance_size = sizeof(ADS7846State),
|
|
.class_init = ads7846_class_init,
|
|
};
|
|
|
|
static void ads7846_register_types(void)
|
|
{
|
|
type_register_static(&ads7846_info);
|
|
}
|
|
|
|
type_init(ads7846_register_types)
|