1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Hardware monitoring driver for Infineon IR36021
4 *
5 * Copyright (c) 2021 Allied Telesis
6 */
7#include <linux/err.h>
8#include <linux/i2c.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include "pmbus.h"
13
14static struct pmbus_driver_info ir36021_info = {
15	.pages = 1,
16	.format[PSC_VOLTAGE_IN] = linear,
17	.format[PSC_VOLTAGE_OUT] = linear,
18	.format[PSC_CURRENT_IN] = linear,
19	.format[PSC_CURRENT_OUT] = linear,
20	.format[PSC_POWER] = linear,
21	.format[PSC_TEMPERATURE] = linear,
22	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
23		| PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
24		| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
25		| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
26		| PMBUS_HAVE_STATUS_TEMP,
27};
28
29static int ir36021_probe(struct i2c_client *client)
30{
31	u8 buf[I2C_SMBUS_BLOCK_MAX];
32	int ret;
33
34	if (!i2c_check_functionality(client->adapter,
35				     I2C_FUNC_SMBUS_READ_BYTE_DATA
36				     | I2C_FUNC_SMBUS_READ_WORD_DATA
37				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
38		return -ENODEV;
39
40	ret = i2c_smbus_read_i2c_block_data(client, PMBUS_MFR_MODEL, 2, buf);
41	if (ret < 0) {
42		dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
43		return ret;
44	}
45	if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) {
46		dev_err(&client->dev, "MFR_MODEL unrecognised\n");
47		return -ENODEV;
48	}
49
50	return pmbus_do_probe(client, &ir36021_info);
51}
52
53static const struct i2c_device_id ir36021_id[] = {
54	{ "ir36021", 0 },
55	{},
56};
57MODULE_DEVICE_TABLE(i2c, ir36021_id);
58
59static const struct of_device_id __maybe_unused ir36021_of_id[] = {
60	{ .compatible = "infineon,ir36021" },
61	{},
62};
63MODULE_DEVICE_TABLE(of, ir36021_of_id);
64
65static struct i2c_driver ir36021_driver = {
66	.driver = {
67		.name = "ir36021",
68		.of_match_table = of_match_ptr(ir36021_of_id),
69	},
70	.probe = ir36021_probe,
71	.id_table = ir36021_id,
72};
73
74module_i2c_driver(ir36021_driver);
75
76MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>");
77MODULE_DESCRIPTION("PMBus driver for Infineon IR36021");
78MODULE_LICENSE("GPL");
79MODULE_IMPORT_NS(PMBUS);
80