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qemu-e2k/hw/misc/emc141x.c
John Wang 5e623f2bf1 hw/misc: add an EMC141{3,4} device model 
Largely inspired by the TMP421 temperature sensor, here is a model for
the EMC1413/EMC1414 temperature sensors.

Specs can be found here :
  http://ww1.microchip.com/downloads/en/DeviceDoc/20005274A.pdf

Signed-off-by: John Wang <wangzhiqiang.bj@bytedance.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20201122105134.671-1-wangzhiqiang.bj@bytedance.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2020-12-10 12:11:03 +01:00

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/*
* SMSC EMC141X temperature sensor.
*
* Copyright (c) 2020 Bytedance Corporation
* Written by John Wang <wangzhiqiang.bj@bytedance.com>
*
* 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 or
* (at your option) version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/i2c/i2c.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "qemu/module.h"
#include "qom/object.h"
#include "hw/misc/emc141x_regs.h"
#define SENSORS_COUNT_MAX 4
struct EMC141XState {
I2CSlave parent_obj;
struct {
uint8_t raw_temp_min;
uint8_t raw_temp_current;
uint8_t raw_temp_max;
} sensor[SENSORS_COUNT_MAX];
uint8_t len;
uint8_t data;
uint8_t pointer;
};
struct EMC141XClass {
I2CSlaveClass parent_class;
uint8_t model;
unsigned sensors_count;
};
#define TYPE_EMC141X "emc141x"
OBJECT_DECLARE_TYPE(EMC141XState, EMC141XClass, EMC141X)
static void emc141x_get_temperature(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
EMC141XState *s = EMC141X(obj);
EMC141XClass *sc = EMC141X_GET_CLASS(s);
int64_t value;
unsigned tempid;
if (sscanf(name, "temperature%u", &tempid) != 1) {
error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
return;
}
if (tempid >= sc->sensors_count) {
error_setg(errp, "error reading %s", name);
return;
}
value = s->sensor[tempid].raw_temp_current * 1000;
visit_type_int(v, name, &value, errp);
}
static void emc141x_set_temperature(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
EMC141XState *s = EMC141X(obj);
EMC141XClass *sc = EMC141X_GET_CLASS(s);
int64_t temp;
unsigned tempid;
if (!visit_type_int(v, name, &temp, errp)) {
return;
}
if (sscanf(name, "temperature%u", &tempid) != 1) {
error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
return;
}
if (tempid >= sc->sensors_count) {
error_setg(errp, "error reading %s", name);
return;
}
s->sensor[tempid].raw_temp_current = temp / 1000;
}
static void emc141x_read(EMC141XState *s)
{
EMC141XClass *sc = EMC141X_GET_CLASS(s);
switch (s->pointer) {
case EMC141X_DEVICE_ID:
s->data = sc->model;
break;
case EMC141X_MANUFACTURER_ID:
s->data = MANUFACTURER_ID;
break;
case EMC141X_REVISION:
s->data = REVISION;
break;
case EMC141X_TEMP_HIGH0:
s->data = s->sensor[0].raw_temp_current;
break;
case EMC141X_TEMP_HIGH1:
s->data = s->sensor[1].raw_temp_current;
break;
case EMC141X_TEMP_HIGH2:
s->data = s->sensor[2].raw_temp_current;
break;
case EMC141X_TEMP_HIGH3:
s->data = s->sensor[3].raw_temp_current;
break;
case EMC141X_TEMP_MAX_HIGH0:
s->data = s->sensor[0].raw_temp_max;
break;
case EMC141X_TEMP_MAX_HIGH1:
s->data = s->sensor[1].raw_temp_max;
break;
case EMC141X_TEMP_MAX_HIGH2:
s->data = s->sensor[2].raw_temp_max;
break;
case EMC141X_TEMP_MAX_HIGH3:
s->data = s->sensor[3].raw_temp_max;
break;
case EMC141X_TEMP_MIN_HIGH0:
s->data = s->sensor[0].raw_temp_min;
break;
case EMC141X_TEMP_MIN_HIGH1:
s->data = s->sensor[1].raw_temp_min;
break;
case EMC141X_TEMP_MIN_HIGH2:
s->data = s->sensor[2].raw_temp_min;
break;
case EMC141X_TEMP_MIN_HIGH3:
s->data = s->sensor[3].raw_temp_min;
break;
default:
s->data = 0;
}
}
static void emc141x_write(EMC141XState *s)
{
switch (s->pointer) {
case EMC141X_TEMP_MAX_HIGH0:
s->sensor[0].raw_temp_max = s->data;
break;
case EMC141X_TEMP_MAX_HIGH1:
s->sensor[1].raw_temp_max = s->data;
break;
case EMC141X_TEMP_MAX_HIGH2:
s->sensor[2].raw_temp_max = s->data;
break;
case EMC141X_TEMP_MAX_HIGH3:
s->sensor[3].raw_temp_max = s->data;
break;
case EMC141X_TEMP_MIN_HIGH0:
s->sensor[0].raw_temp_min = s->data;
break;
case EMC141X_TEMP_MIN_HIGH1:
s->sensor[1].raw_temp_min = s->data;
break;
case EMC141X_TEMP_MIN_HIGH2:
s->sensor[2].raw_temp_min = s->data;
break;
case EMC141X_TEMP_MIN_HIGH3:
s->sensor[3].raw_temp_min = s->data;
break;
default:
s->data = 0;
}
}
static uint8_t emc141x_rx(I2CSlave *i2c)
{
EMC141XState *s = EMC141X(i2c);
if (s->len == 0) {
s->len++;
return s->data;
} else {
return 0xff;
}
}
static int emc141x_tx(I2CSlave *i2c, uint8_t data)
{
EMC141XState *s = EMC141X(i2c);
if (s->len == 0) {
/* first byte is the reg pointer */
s->pointer = data;
s->len++;
} else if (s->len == 1) {
s->data = data;
emc141x_write(s);
}
return 0;
}
static int emc141x_event(I2CSlave *i2c, enum i2c_event event)
{
EMC141XState *s = EMC141X(i2c);
if (event == I2C_START_RECV) {
emc141x_read(s);
}
s->len = 0;
return 0;
}
static const VMStateDescription vmstate_emc141x = {
.name = "EMC141X",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT8(len, EMC141XState),
VMSTATE_UINT8(data, EMC141XState),
VMSTATE_UINT8(pointer, EMC141XState),
VMSTATE_I2C_SLAVE(parent_obj, EMC141XState),
VMSTATE_END_OF_LIST()
}
};
static void emc141x_reset(DeviceState *dev)
{
EMC141XState *s = EMC141X(dev);
int i;
for (i = 0; i < SENSORS_COUNT_MAX; i++) {
s->sensor[i].raw_temp_max = 0x55;
}
s->pointer = 0;
s->len = 0;
}
static void emc141x_initfn(Object *obj)
{
object_property_add(obj, "temperature0", "int",
emc141x_get_temperature,
emc141x_set_temperature, NULL, NULL);
object_property_add(obj, "temperature1", "int",
emc141x_get_temperature,
emc141x_set_temperature, NULL, NULL);
object_property_add(obj, "temperature2", "int",
emc141x_get_temperature,
emc141x_set_temperature, NULL, NULL);
object_property_add(obj, "temperature3", "int",
emc141x_get_temperature,
emc141x_set_temperature, NULL, NULL);
}
static void emc141x_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
dc->reset = emc141x_reset;
k->event = emc141x_event;
k->recv = emc141x_rx;
k->send = emc141x_tx;
dc->vmsd = &vmstate_emc141x;
}
static void emc1413_class_init(ObjectClass *klass, void *data)
{
EMC141XClass *ec = EMC141X_CLASS(klass);
emc141x_class_init(klass, data);
ec->model = EMC1413_DEVICE_ID;
ec->sensors_count = 3;
}
static void emc1414_class_init(ObjectClass *klass, void *data)
{
EMC141XClass *ec = EMC141X_CLASS(klass);
emc141x_class_init(klass, data);
ec->model = EMC1414_DEVICE_ID;
ec->sensors_count = 4;
}
static const TypeInfo emc141x_info = {
.name = TYPE_EMC141X,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(EMC141XState),
.class_size = sizeof(EMC141XClass),
.instance_init = emc141x_initfn,
.abstract = true,
};
static const TypeInfo emc1413_info = {
.name = "emc1413",
.parent = TYPE_EMC141X,
.class_init = emc1413_class_init,
};
static const TypeInfo emc1414_info = {
.name = "emc1414",
.parent = TYPE_EMC141X,
.class_init = emc1414_class_init,
};
static void emc141x_register_types(void)
{
type_register_static(&emc141x_info);
type_register_static(&emc1413_info);
type_register_static(&emc1414_info);
}
type_init(emc141x_register_types)
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