drivers/hwmon/pmbus/d1u74t.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2026 Nexthop Systems.
 */

#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include <linux/string.h>

#include "pmbus.h"

static const struct i2c_device_id d1u74t_id[] = {
	{ "d1u74t" },
	{},
};
MODULE_DEVICE_TABLE(i2c, d1u74t_id);

static struct pmbus_driver_info d1u74t_info = {
	.pages = 1,
	/* PSU uses default linear data format. */
	.func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		   PMBUS_HAVE_IIN | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
		   PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_TEMP |
		   PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
		   PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_FAN12 |
		   PMBUS_HAVE_STATUS_FAN12,
};

static int d1u74t_probe(struct i2c_client *client)
{
	char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
	struct device *dev = &client->dev;
	int rc;

	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
	if (rc < 0)
		return dev_err_probe(dev, rc, "Failed to read PMBUS_MFR_ID\n");

	if (rc != 9 || strncmp(buf, "Murata-PS", 9)) {
		buf[rc] = '\0';
		return dev_err_probe(dev, -ENODEV,
				     "Unsupported Manufacturer ID '%s'\n",
				     buf);
	}

	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
	if (rc < 0)
		return dev_err_probe(dev, rc,
				     "Failed to read PMBUS_MFR_MODEL\n");

	if (rc < 8 || strncmp(buf, "D1U74T-W", 8)) {
		buf[rc] = '\0';
		return dev_err_probe(dev, -ENODEV, "Model '%s' not supported\n",
				     buf);
	}

	rc = pmbus_do_probe(client, &d1u74t_info);
	if (rc)
		return dev_err_probe(dev, rc, "Failed to probe\n");

	return 0;
}

static const struct of_device_id d1u74t_of_match[] = {
	{
		.compatible = "murata,d1u74t",
	},
	{},
};
MODULE_DEVICE_TABLE(of, d1u74t_of_match);

static struct i2c_driver d1u74t_driver = {
	.driver = {
		.name = "d1u74t",
		.of_match_table = d1u74t_of_match,
	},
	.probe = d1u74t_probe,
	.id_table = d1u74t_id,
};

module_i2c_driver(d1u74t_driver);

MODULE_AUTHOR("Abdurrahman Hussain");
MODULE_DESCRIPTION("PMBus driver for Murata D1U74T-W power supplies");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");