1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2023 IBM Corp.
4 */
5
6#include <linux/debugfs.h>
7#include <linux/device.h>
8#include <linux/fs.h>
9#include <linux/i2c.h>
10#include <linux/minmax.h>
11#include <linux/module.h>
12#include <linux/pmbus.h>
13#include <linux/hwmon-sysfs.h>
14#include "pmbus.h"
15
16#define ACBEL_MFR_FW_REVISION	0xd9
17
18static ssize_t acbel_fsg032_debugfs_read(struct file *file, char __user *buf, size_t count,
19					 loff_t *ppos)
20{
21	struct i2c_client *client = file->private_data;
22	u8 data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
23	char out[8];
24	int rc;
25
26	rc = i2c_smbus_read_block_data(client, ACBEL_MFR_FW_REVISION, data);
27	if (rc < 0)
28		return rc;
29
30	rc = snprintf(out, sizeof(out), "%*phN\n", min(rc, 3), data);
31	return simple_read_from_buffer(buf, count, ppos, out, rc);
32}
33
34static const struct file_operations acbel_debugfs_ops = {
35	.llseek = noop_llseek,
36	.read = acbel_fsg032_debugfs_read,
37	.write = NULL,
38	.open = simple_open,
39};
40
41static void acbel_fsg032_init_debugfs(struct i2c_client *client)
42{
43	struct dentry *debugfs = pmbus_get_debugfs_dir(client);
44
45	if (!debugfs)
46		return;
47
48	debugfs_create_file("fw_version", 0444, debugfs, client, &acbel_debugfs_ops);
49}
50
51static const struct i2c_device_id acbel_fsg032_id[] = {
52	{ "acbel_fsg032" },
53	{}
54};
55
56static struct pmbus_driver_info acbel_fsg032_info = {
57	.pages = 1,
58	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
59		   PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
60		   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
61		   PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_VOUT |
62		   PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP |
63		   PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_FAN12,
64};
65
66static int acbel_fsg032_probe(struct i2c_client *client)
67{
68	u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
69	struct device *dev = &client->dev;
70	int rc;
71
72	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
73	if (rc < 0) {
74		dev_err(dev, "Failed to read PMBUS_MFR_ID\n");
75		return rc;
76	}
77	if (strncmp(buf, "ACBEL", 5)) {
78		buf[rc] = '\0';
79		dev_err(dev, "Manufacturer '%s' not supported\n", buf);
80		return -ENODEV;
81	}
82
83	rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
84	if (rc < 0) {
85		dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");
86		return rc;
87	}
88
89	if (strncmp(buf, "FSG032", 6)) {
90		buf[rc] = '\0';
91		dev_err(dev, "Model '%s' not supported\n", buf);
92		return -ENODEV;
93	}
94
95	rc = pmbus_do_probe(client, &acbel_fsg032_info);
96	if (rc)
97		return rc;
98
99	acbel_fsg032_init_debugfs(client);
100	return 0;
101}
102
103static const struct of_device_id acbel_fsg032_of_match[] = {
104	{ .compatible = "acbel,fsg032" },
105	{}
106};
107MODULE_DEVICE_TABLE(of, acbel_fsg032_of_match);
108
109static struct i2c_driver acbel_fsg032_driver = {
110	.driver = {
111		.name = "acbel-fsg032",
112		.of_match_table = acbel_fsg032_of_match,
113	},
114	.probe = acbel_fsg032_probe,
115	.id_table = acbel_fsg032_id,
116};
117
118module_i2c_driver(acbel_fsg032_driver);
119
120MODULE_AUTHOR("Lakshmi Yadlapati");
121MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");
122MODULE_LICENSE("GPL");
123MODULE_IMPORT_NS(PMBUS);
124