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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2017-2021 Joel Stanley <joel@jms.id.au>, IBM Corporation
*
* Infineon DPS310 temperature and humidity sensor
*
* https://www.infineon.com/cms/en/product/sensor/pressure-sensors/pressure-sensors-for-iot/dps310/
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/i2c/i2c.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "migration/vmstate.h"
#define NUM_REGISTERS 0x33
typedef struct DPS310State {
/*< private >*/
I2CSlave i2c;
/*< public >*/
uint8_t regs[NUM_REGISTERS];
uint8_t len;
uint8_t pointer;
} DPS310State;
#define TYPE_DPS310 "dps310"
#define DPS310(obj) OBJECT_CHECK(DPS310State, (obj), TYPE_DPS310)
#define DPS310_PRS_B2 0x00
#define DPS310_PRS_B1 0x01
#define DPS310_PRS_B0 0x02
#define DPS310_TMP_B2 0x03
#define DPS310_TMP_B1 0x04
#define DPS310_TMP_B0 0x05
#define DPS310_PRS_CFG 0x06
#define DPS310_TMP_CFG 0x07
#define DPS310_TMP_RATE_BITS (0x70)
#define DPS310_MEAS_CFG 0x08
#define DPS310_MEAS_CTRL_BITS (0x07)
#define DPS310_PRESSURE_EN BIT(0)
#define DPS310_TEMP_EN BIT(1)
#define DPS310_BACKGROUND BIT(2)
#define DPS310_PRS_RDY BIT(4)
#define DPS310_TMP_RDY BIT(5)
#define DPS310_SENSOR_RDY BIT(6)
#define DPS310_COEF_RDY BIT(7)
#define DPS310_CFG_REG 0x09
#define DPS310_RESET 0x0c
#define DPS310_RESET_MAGIC (BIT(0) | BIT(3))
#define DPS310_COEF_BASE 0x10
#define DPS310_COEF_LAST 0x21
#define DPS310_COEF_SRC 0x28
static void dps310_reset(DeviceState *dev)
{
DPS310State *s = DPS310(dev);
static const uint8_t regs_reset_state[sizeof(s->regs)] = {
0xfe, 0x2f, 0xee, 0x02, 0x69, 0xa6, 0x00, 0x80, 0xc7, 0x00, 0x00, 0x00,
0x00, 0x10, 0x00, 0x00, 0x0e, 0x1e, 0xdd, 0x13, 0xca, 0x5f, 0x21, 0x52,
0xf9, 0xc6, 0x04, 0xd1, 0xdb, 0x47, 0x00, 0x5b, 0xfb, 0x3a, 0x00, 0x00,
0x20, 0x49, 0x4e, 0xa5, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x60, 0x15, 0x02
};
memcpy(s->regs, regs_reset_state, sizeof(s->regs));
s->pointer = 0;
/* TODO: assert these after some timeout ? */
s->regs[DPS310_MEAS_CFG] = DPS310_COEF_RDY | DPS310_SENSOR_RDY
| DPS310_TMP_RDY | DPS310_PRS_RDY;
}
static uint8_t dps310_read(DPS310State *s, uint8_t reg)
{
if (reg >= sizeof(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: register 0x%02x out of bounds\n",
__func__, s->pointer);
return 0xFF;
}
switch (reg) {
case DPS310_PRS_B2:
case DPS310_PRS_B1:
case DPS310_PRS_B0:
case DPS310_TMP_B2:
case DPS310_TMP_B1:
case DPS310_TMP_B0:
case DPS310_PRS_CFG:
case DPS310_TMP_CFG:
case DPS310_MEAS_CFG:
case DPS310_CFG_REG:
case DPS310_COEF_BASE...DPS310_COEF_LAST:
case DPS310_COEF_SRC:
case 0x32: /* Undocumented register to indicate workaround not required */
return s->regs[reg];
default:
qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n",
__func__, reg);
return 0xFF;
}
}
static void dps310_write(DPS310State *s, uint8_t reg, uint8_t data)
{
if (reg >= sizeof(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: register %d out of bounds\n",
__func__, s->pointer);
return;
}
switch (reg) {
case DPS310_RESET:
if (data == DPS310_RESET_MAGIC) {
device_cold_reset(DEVICE(s));
}
break;
case DPS310_PRS_CFG:
case DPS310_TMP_CFG:
case DPS310_MEAS_CFG:
case DPS310_CFG_REG:
s->regs[reg] = data;
break;
default:
qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n",
__func__, reg);
return;
}
}
static uint8_t dps310_rx(I2CSlave *i2c)
{
DPS310State *s = DPS310(i2c);
if (s->len == 1) {
return dps310_read(s, s->pointer++);
} else {
return 0xFF;
}
}
static int dps310_tx(I2CSlave *i2c, uint8_t data)
{
DPS310State *s = DPS310(i2c);
if (s->len == 0) {
/*
* first byte is the register pointer for a read or write
* operation
*/
s->pointer = data;
s->len++;
} else if (s->len == 1) {
dps310_write(s, s->pointer++, data);
}
return 0;
}
static int dps310_event(I2CSlave *i2c, enum i2c_event event)
{
DPS310State *s = DPS310(i2c);
switch (event) {
case I2C_START_SEND:
s->pointer = 0xFF;
s->len = 0;
break;
case I2C_START_RECV:
if (s->len != 1) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid recv sequence\n",
__func__);
}
break;
default:
break;
}
return 0;
}
static const VMStateDescription vmstate_dps310 = {
.name = "DPS310",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT8(len, DPS310State),
VMSTATE_UINT8_ARRAY(regs, DPS310State, NUM_REGISTERS),
VMSTATE_UINT8(pointer, DPS310State),
VMSTATE_I2C_SLAVE(i2c, DPS310State),
VMSTATE_END_OF_LIST()
}
};
static void dps310_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
k->event = dps310_event;
k->recv = dps310_rx;
k->send = dps310_tx;
dc->reset = dps310_reset;
dc->vmsd = &vmstate_dps310;
}
static const TypeInfo dps310_info = {
.name = TYPE_DPS310,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(DPS310State),
.class_init = dps310_class_init,
};
static void dps310_register_types(void)
{
type_register_static(&dps310_info);
}
type_init(dps310_register_types)
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