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
12 static const struct i2c_device_id crps_id[] = {
13 { "intel_crps185" },
14 {}
15 };
16 MODULE_DEVICE_TABLE(i2c, crps_id);
17
18 static 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
crps_probe(struct i2c_client * client)30 static 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
52 static const struct of_device_id crps_of_match[] = {
53 {
54 .compatible = "intel,crps185",
55 },
56 {}
57 };
58 MODULE_DEVICE_TABLE(of, crps_of_match);
59
60 static 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
69 module_i2c_driver(crps_driver);
70
71 MODULE_AUTHOR("Ninad Palsule");
72 MODULE_DESCRIPTION("PMBus driver for Intel Common Redundant power supplies");
73 MODULE_LICENSE("GPL");
74 MODULE_IMPORT_NS("PMBUS");
75