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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2025 Liebherr-Electronics and Drives GmbH
*/
#include <linux/auxiliary_bus.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/hwmon.h>
#include <linux/mc33xs2410.h>
#include <linux/module.h>
/* ctrl registers */
#define MC33XS2410_TEMP_WT 0x29
#define MC33XS2410_TEMP_WT_MASK GENMASK(7, 0)
/* diag registers */
/* chan in { 1 ... 4 } */
#define MC33XS2410_OUT_STA(chan) (0x02 + (chan) - 1)
#define MC33XS2410_OUT_STA_OTW BIT(8)
#define MC33XS2410_TS_TEMP_DIE 0x26
#define MC33XS2410_TS_TEMP_MASK GENMASK(9, 0)
/* chan in { 1 ... 4 } */
#define MC33XS2410_TS_TEMP(chan) (0x2f + (chan) - 1)
static const struct hwmon_channel_info * const mc33xs2410_hwmon_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_LABEL | HWMON_T_INPUT,
HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
HWMON_T_ALARM,
HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
HWMON_T_ALARM,
HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
HWMON_T_ALARM,
HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX |
HWMON_T_ALARM),
NULL,
};
static umode_t mc33xs2410_hwmon_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_alarm:
case hwmon_temp_label:
return 0444;
case hwmon_temp_max:
return 0644;
default:
return 0;
}
}
static int mc33xs2410_hwmon_read(struct device *dev,
enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct spi_device *spi = dev_get_drvdata(dev);
u16 reg_val;
int ret;
u8 reg;
switch (attr) {
case hwmon_temp_input:
reg = (channel == 0) ? MC33XS2410_TS_TEMP_DIE :
MC33XS2410_TS_TEMP(channel);
ret = mc33xs2410_read_reg_diag(spi, reg, ®_val);
if (ret < 0)
return ret;
/* LSB is 0.25 degree celsius */
*val = FIELD_GET(MC33XS2410_TS_TEMP_MASK, reg_val) * 250 - 40000;
return 0;
case hwmon_temp_alarm:
ret = mc33xs2410_read_reg_diag(spi, MC33XS2410_OUT_STA(channel),
®_val);
if (ret < 0)
return ret;
*val = FIELD_GET(MC33XS2410_OUT_STA_OTW, reg_val);
return 0;
case hwmon_temp_max:
ret = mc33xs2410_read_reg_ctrl(spi, MC33XS2410_TEMP_WT, ®_val);
if (ret < 0)
return ret;
/* LSB is 1 degree celsius */
*val = FIELD_GET(MC33XS2410_TEMP_WT_MASK, reg_val) * 1000 - 40000;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int mc33xs2410_hwmon_write(struct device *dev,
enum hwmon_sensor_types type, u32 attr,
int channel, long val)
{
struct spi_device *spi = dev_get_drvdata(dev);
switch (attr) {
case hwmon_temp_max:
val = clamp_val(val, -40000, 215000);
/* LSB is 1 degree celsius */
val = (val / 1000) + 40;
return mc33xs2410_modify_reg(spi, MC33XS2410_TEMP_WT,
MC33XS2410_TEMP_WT_MASK, val);
default:
return -EOPNOTSUPP;
}
}
static const char *const mc33xs2410_temp_label[] = {
"Central die temperature",
"Channel 1 temperature",
"Channel 2 temperature",
"Channel 3 temperature",
"Channel 4 temperature",
};
static int mc33xs2410_read_string(struct device *dev,
enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
*str = mc33xs2410_temp_label[channel];
return 0;
}
static const struct hwmon_ops mc33xs2410_hwmon_hwmon_ops = {
.is_visible = mc33xs2410_hwmon_is_visible,
.read = mc33xs2410_hwmon_read,
.read_string = mc33xs2410_read_string,
.write = mc33xs2410_hwmon_write,
};
static const struct hwmon_chip_info mc33xs2410_hwmon_chip_info = {
.ops = &mc33xs2410_hwmon_hwmon_ops,
.info = mc33xs2410_hwmon_info,
};
static int mc33xs2410_hwmon_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct device *dev = &adev->dev;
struct spi_device *spi = container_of(dev->parent, struct spi_device, dev);
struct device *hwmon;
hwmon = devm_hwmon_device_register_with_info(dev, NULL, spi,
&mc33xs2410_hwmon_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon);
}
static const struct auxiliary_device_id mc33xs2410_hwmon_ids[] = {
{
.name = "pwm_mc33xs2410.hwmon",
},
{ }
};
MODULE_DEVICE_TABLE(auxiliary, mc33xs2410_hwmon_ids);
static struct auxiliary_driver mc33xs2410_hwmon_driver = {
.probe = mc33xs2410_hwmon_probe,
.id_table = mc33xs2410_hwmon_ids,
};
module_auxiliary_driver(mc33xs2410_hwmon_driver);
MODULE_DESCRIPTION("NXP MC33XS2410 hwmon driver");
MODULE_AUTHOR("Dimitri Fedrau <dimitri.fedrau@liebherr.com>");
MODULE_LICENSE("GPL");
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