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ef68b3dbbe
Add PMBUS driver for Murata D1U74T power supplies. Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai> Link: https://lore.kernel.org/r/20260514-d1u74t-v4-2-1f1ee7b002ec@nexthop.ai [groeck: Dropped inappropriate tags; added missing include files] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2026 Nexthop Systems.
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*/
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#include <linux/i2c.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/pmbus.h>
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#include <linux/string.h>
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#include "pmbus.h"
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static const struct i2c_device_id d1u74t_id[] = {
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{ "d1u74t" },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, d1u74t_id);
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static struct pmbus_driver_info d1u74t_info = {
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.pages = 1,
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/* PSU uses default linear data format. */
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.func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_IIN | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_TEMP |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
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PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_FAN12 |
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PMBUS_HAVE_STATUS_FAN12,
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};
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static int d1u74t_probe(struct i2c_client *client)
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{
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char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
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struct device *dev = &client->dev;
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int rc;
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rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
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if (rc < 0)
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return dev_err_probe(dev, rc, "Failed to read PMBUS_MFR_ID\n");
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if (rc != 9 || strncmp(buf, "Murata-PS", 9)) {
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buf[rc] = '\0';
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return dev_err_probe(dev, -ENODEV,
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"Unsupported Manufacturer ID '%s'\n",
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buf);
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}
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rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
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if (rc < 0)
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return dev_err_probe(dev, rc,
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"Failed to read PMBUS_MFR_MODEL\n");
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if (rc < 8 || strncmp(buf, "D1U74T-W", 8)) {
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buf[rc] = '\0';
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return dev_err_probe(dev, -ENODEV, "Model '%s' not supported\n",
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buf);
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}
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rc = pmbus_do_probe(client, &d1u74t_info);
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if (rc)
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return dev_err_probe(dev, rc, "Failed to probe\n");
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return 0;
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}
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static const struct of_device_id d1u74t_of_match[] = {
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{
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.compatible = "murata,d1u74t",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, d1u74t_of_match);
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static struct i2c_driver d1u74t_driver = {
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.driver = {
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.name = "d1u74t",
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.of_match_table = d1u74t_of_match,
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},
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.probe = d1u74t_probe,
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.id_table = d1u74t_id,
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};
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module_i2c_driver(d1u74t_driver);
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MODULE_AUTHOR("Abdurrahman Hussain");
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MODULE_DESCRIPTION("PMBus driver for Murata D1U74T-W power supplies");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("PMBUS");
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