1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 2023 IBM Corp.
4  */
5 
6 #include <linux/device.h>
7 #include <linux/fs.h>
8 #include <linux/i2c.h>
9 #include <linux/module.h>
10 #include <linux/pmbus.h>
11 #include <linux/hwmon-sysfs.h>
12 #include "pmbus.h"
13 
14 static const struct i2c_device_id acbel_fsg032_id[] = {
15 	{ "acbel_fsg032" },
16 	{}
17 };
18 
19 static struct pmbus_driver_info acbel_fsg032_info = {
20 	.pages = 1,
21 	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
22 		   PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
23 		   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
24 		   PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_VOUT |
25 		   PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP |
26 		   PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_FAN12,
27 };
28 
29 static int acbel_fsg032_probe(struct i2c_client *client)
30 {
31 	u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
32 	struct device *dev = &client->dev;
33 	int rc;
34 
35 	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
36 	if (rc < 0) {
37 		dev_err(dev, "Failed to read PMBUS_MFR_ID\n");
38 		return rc;
39 	}
40 	if (strncmp(buf, "ACBEL", 5)) {
41 		buf[rc] = '\0';
42 		dev_err(dev, "Manufacturer '%s' not supported\n", buf);
43 		return -ENODEV;
44 	}
45 
46 	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
47 	if (rc < 0) {
48 		dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");
49 		return rc;
50 	}
51 
52 	if (strncmp(buf, "FSG032", 6)) {
53 		buf[rc] = '\0';
54 		dev_err(dev, "Model '%s' not supported\n", buf);
55 		return -ENODEV;
56 	}
57 
58 	rc = pmbus_do_probe(client, &acbel_fsg032_info);
59 	if (rc)
60 		return rc;
61 
62 	return 0;
63 }
64 
65 static const struct of_device_id acbel_fsg032_of_match[] = {
66 	{ .compatible = "acbel,fsg032" },
67 	{}
68 };
69 MODULE_DEVICE_TABLE(of, acbel_fsg032_of_match);
70 
71 static struct i2c_driver acbel_fsg032_driver = {
72 	.driver = {
73 		.name = "acbel-fsg032",
74 		.of_match_table = acbel_fsg032_of_match,
75 	},
76 	.probe = acbel_fsg032_probe,
77 	.id_table = acbel_fsg032_id,
78 };
79 
80 module_i2c_driver(acbel_fsg032_driver);
81 
82 MODULE_AUTHOR("Lakshmi Yadlapati");
83 MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");
84 MODULE_LICENSE("GPL");
85 MODULE_IMPORT_NS(PMBUS);
86