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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-26 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "thermal.scmi"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct scmi_thermal
{
struct rt_thermal_zone_device parent;
rt_uint32_t sensor_id;
rt_uint32_t scale;
struct rt_scmi_device *sdev;
};
#define raw_to_scmi_thermal(raw) rt_container_of(raw, struct scmi_thermal, parent)
static rt_err_t scmi_thermal_zone_get_temp(struct rt_thermal_zone_device *zdev,
int *out_temp)
{
int scale;
rt_err_t err;
rt_uint64_t value, factor = 1;
struct scmi_thermal *st = raw_to_scmi_thermal(zdev);
struct scmi_sensor_reading_in reading_in =
{
.id = rt_cpu_to_le32(st->sensor_id),
.flags = rt_cpu_to_le32(0),
};
struct scmi_sensor_reading_out reading_out;
struct rt_scmi_msg msg = RT_SCMI_MSG_IN_OUT(SCMI_SENSOR_READING_GET, &reading_in, &reading_out);
if ((err = rt_scmi_process_msg(st->sdev, &msg)))
{
return err;
}
value = rt_le32_to_cpu(reading_out.value_high);
value <<= 32;
value |= rt_le32_to_cpu(reading_out.value_low);
scale = st->scale + 3;
if (scale == 0)
{
goto _end;
}
if (scale > 19 || scale < -19)
{
return -RT_EIO;
}
for (int i = 0; i < rt_abs(scale); i++)
{
factor *= 10;
}
if (scale > 0)
{
value *= factor;
}
else
{
value = rt_div_u64(value, factor);
}
_end:
*out_temp = (int)value;
return err;
}
const static struct rt_thermal_zone_ops scmi_thermal_zone_ops =
{
.get_temp = scmi_thermal_zone_get_temp,
};
static rt_err_t scmi_thermal_probe(struct rt_scmi_device *sdev)
{
rt_err_t err;
struct scmi_sensor_attributes attr = {};
struct scmi_sensor_description_get_out *desc_out;
struct rt_scmi_msg msg = RT_SCMI_MSG_OUT(SCMI_COM_MSG_ATTRIBUTES, &attr);
if ((err = rt_scmi_process_msg(sdev, &msg)))
{
return err;
}
desc_out = rt_malloc(sizeof(*desc_out) + sizeof(desc_out->desc[0]));
if (!desc_out)
{
return -RT_ENOMEM;
}
for (int i = 0, ts_nr = 0; i < attr.num_sensors; ++i)
{
struct scmi_thermal *st;
struct rt_thermal_zone_device *tz;
struct scmi_sensor_description_get_in desc_in;
desc_in.desc_index = i;
msg = RT_SCMI_MSG_IN_OUT(SCMI_SENSOR_DESCRIPTION_GET, &desc_in, desc_out);
if ((err = rt_scmi_process_msg(sdev, &msg)))
{
goto _end;
}
if (SCMI_SENSOR_TYPE(rt_le32_to_cpu(desc_out->desc[0].attributes_high)) !=
SCMI_SENSOR_TYPE_TEMPERATURE_C)
{
continue;
}
if (!(st = rt_calloc(1, sizeof(*st))))
{
err = -RT_ENOMEM;
goto _end;
}
st->sdev = sdev;
st->sensor_id = rt_le32_to_cpu(desc_out->desc[0].id);
st->scale = SCMI_SENSOR_SCALE(desc_out->desc[0].attributes_high);
tz = &st->parent;
tz->zone_id = ts_nr;
tz->ops = &scmi_thermal_zone_ops;
tz->parent.ofw_node = sdev->parent.ofw_node;
rt_dm_dev_set_name(&tz->parent, "scmi-%s", desc_out->desc[0].name);
rt_thermal_zone_device_register(tz);
++ts_nr;
}
_end:
rt_free(desc_out);
return err;
}
static const struct rt_scmi_device_id scmi_thermal_ids[] =
{
{ SCMI_PROTOCOL_ID_SENSOR, "thermal" },
{ /* sentinel */ },
};
static struct rt_scmi_driver scmi_thermal_driver =
{
.name = "thermal-scmi",
.ids = scmi_thermal_ids,
.probe = scmi_thermal_probe,
};
RT_SCMI_DRIVER_EXPORT(scmi_thermal_driver);
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