crps.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright 2024 IBM Corp.
 4 */
 5
 6#include <linux/i2c.h>
 7#include <linux/of.h>
 8#include <linux/pmbus.h>
 9
10#include "pmbus.h"
11
12static const struct i2c_device_id crps_id[] = {
13	{ "intel_crps185" },
14	{}
15};
16MODULE_DEVICE_TABLE(i2c, crps_id);
17
18static struct pmbus_driver_info crps_info = {
19	.pages = 1,
20	/* PSU uses default linear data format. */
21	.func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT |
22		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN |
23		PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
24		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
25		PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
26		PMBUS_HAVE_STATUS_TEMP |
27		PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
28};
29
30static int crps_probe(struct i2c_client *client)
31{
32	int rc;
33	struct device *dev = &client->dev;
34	char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
35
36	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
37	if (rc < 0)
38		return dev_err_probe(dev, rc, "Failed to read PMBUS_MFR_MODEL\n");
39
40	if (rc != 7 || strncmp(buf, "03NK260", 7)) {
41		buf[rc] = '\0';
42		return dev_err_probe(dev, -ENODEV, "Model '%s' not supported\n", buf);
43	}
44
45	rc = pmbus_do_probe(client, &crps_info);
46	if (rc)
47		return dev_err_probe(dev, rc, "Failed to probe\n");
48
49	return 0;
50}
51
52static const struct of_device_id crps_of_match[] = {
53	{
54		.compatible = "intel,crps185",
55	},
56	{}
57};
58MODULE_DEVICE_TABLE(of, crps_of_match);
59
60static struct i2c_driver crps_driver = {
61	.driver = {
62		.name = "crps",
63		.of_match_table = crps_of_match,
64	},
65	.probe = crps_probe,
66	.id_table = crps_id,
67};
68
69module_i2c_driver(crps_driver);
70
71MODULE_AUTHOR("Ninad Palsule");
72MODULE_DESCRIPTION("PMBus driver for Intel Common Redundant power supplies");
73MODULE_LICENSE("GPL");
74MODULE_IMPORT_NS("PMBUS");