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// SPDX-License-Identifier: GPL-2.0
/*
* Hardware monitoring driver for Analog Devices LT3074
*
* Copyright (C) 2025 Analog Devices, Inc.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include "pmbus.h"
#define LT3074_MFR_READ_VBIAS 0xc6
#define LT3074_MFR_BIAS_OV_WARN_LIMIT 0xc7
#define LT3074_MFR_BIAS_UV_WARN_LIMIT 0xc8
#define LT3074_MFR_SPECIAL_ID 0xe7
#define LT3074_SPECIAL_ID_VALUE 0x1c1d
static const struct regulator_desc __maybe_unused lt3074_reg_desc[] = {
PMBUS_REGULATOR_ONE("regulator"),
};
static int lt3074_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
switch (reg) {
case PMBUS_VIRT_READ_VMON:
return pmbus_read_word_data(client, page, phase,
LT3074_MFR_READ_VBIAS);
case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
return pmbus_read_word_data(client, page, phase,
LT3074_MFR_BIAS_UV_WARN_LIMIT);
case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
return pmbus_read_word_data(client, page, phase,
LT3074_MFR_BIAS_OV_WARN_LIMIT);
default:
return -ENODATA;
}
}
static int lt3074_write_word_data(struct i2c_client *client, int page,
int reg, u16 word)
{
switch (reg) {
case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
return pmbus_write_word_data(client, 0,
LT3074_MFR_BIAS_UV_WARN_LIMIT,
word);
case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
return pmbus_write_word_data(client, 0,
LT3074_MFR_BIAS_OV_WARN_LIMIT,
word);
default:
return -ENODATA;
}
}
static struct pmbus_driver_info lt3074_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_TEMPERATURE] = linear,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_VMON |
PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.read_word_data = lt3074_read_word_data,
.write_word_data = lt3074_write_word_data,
#if IS_ENABLED(CONFIG_SENSORS_LT3074_REGULATOR)
.num_regulators = 1,
.reg_desc = lt3074_reg_desc,
#endif
};
static int lt3074_probe(struct i2c_client *client)
{
int ret;
struct device *dev = &client->dev;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -ENODEV;
ret = i2c_smbus_read_word_data(client, LT3074_MFR_SPECIAL_ID);
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to read ID\n");
if (ret != LT3074_SPECIAL_ID_VALUE)
return dev_err_probe(dev, -ENODEV, "ID mismatch\n");
return pmbus_do_probe(client, <3074_info);
}
static const struct i2c_device_id lt3074_id[] = {
{ "lt3074", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, lt3074_id);
static const struct of_device_id __maybe_unused lt3074_of_match[] = {
{ .compatible = "adi,lt3074" },
{}
};
MODULE_DEVICE_TABLE(of, lt3074_of_match);
static struct i2c_driver lt3074_driver = {
.driver = {
.name = "lt3074",
.of_match_table = of_match_ptr(lt3074_of_match),
},
.probe = lt3074_probe,
.id_table = lt3074_id,
};
module_i2c_driver(lt3074_driver);
MODULE_AUTHOR("Cedric Encarnacion <cedricjustine.encarnacion@analog.com>");
MODULE_DESCRIPTION("PMBus driver for Analog Devices LT3074");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");
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