1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Hardware monitoring driver for IR35221
4 *
5 * Copyright (C) IBM Corporation 2017.
6 */
7
8#include <linux/err.h>
9#include <linux/i2c.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include "pmbus.h"
14
15#define IR35221_MFR_VIN_PEAK		0xc5
16#define IR35221_MFR_VOUT_PEAK		0xc6
17#define IR35221_MFR_IOUT_PEAK		0xc7
18#define IR35221_MFR_TEMP_PEAK		0xc8
19#define IR35221_MFR_VIN_VALLEY		0xc9
20#define IR35221_MFR_VOUT_VALLEY		0xca
21#define IR35221_MFR_IOUT_VALLEY		0xcb
22#define IR35221_MFR_TEMP_VALLEY		0xcc
23
24static int ir35221_read_word_data(struct i2c_client *client, int page,
25				  int phase, int reg)
26{
27	int ret;
28
29	switch (reg) {
30	case PMBUS_VIRT_READ_VIN_MAX:
31		ret = pmbus_read_word_data(client, page, phase,
32					   IR35221_MFR_VIN_PEAK);
33		break;
34	case PMBUS_VIRT_READ_VOUT_MAX:
35		ret = pmbus_read_word_data(client, page, phase,
36					   IR35221_MFR_VOUT_PEAK);
37		break;
38	case PMBUS_VIRT_READ_IOUT_MAX:
39		ret = pmbus_read_word_data(client, page, phase,
40					   IR35221_MFR_IOUT_PEAK);
41		break;
42	case PMBUS_VIRT_READ_TEMP_MAX:
43		ret = pmbus_read_word_data(client, page, phase,
44					   IR35221_MFR_TEMP_PEAK);
45		break;
46	case PMBUS_VIRT_READ_VIN_MIN:
47		ret = pmbus_read_word_data(client, page, phase,
48					   IR35221_MFR_VIN_VALLEY);
49		break;
50	case PMBUS_VIRT_READ_VOUT_MIN:
51		ret = pmbus_read_word_data(client, page, phase,
52					   IR35221_MFR_VOUT_VALLEY);
53		break;
54	case PMBUS_VIRT_READ_IOUT_MIN:
55		ret = pmbus_read_word_data(client, page, phase,
56					   IR35221_MFR_IOUT_VALLEY);
57		break;
58	case PMBUS_VIRT_READ_TEMP_MIN:
59		ret = pmbus_read_word_data(client, page, phase,
60					   IR35221_MFR_TEMP_VALLEY);
61		break;
62	default:
63		ret = -ENODATA;
64		break;
65	}
66
67	return ret;
68}
69
70static int ir35221_probe(struct i2c_client *client)
71{
72	struct pmbus_driver_info *info;
73	u8 buf[I2C_SMBUS_BLOCK_MAX];
74	int ret;
75
76	if (!i2c_check_functionality(client->adapter,
77				     I2C_FUNC_SMBUS_READ_BYTE_DATA
78				| I2C_FUNC_SMBUS_READ_WORD_DATA
79				| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
80		return -ENODEV;
81
82	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
83	if (ret < 0) {
84		dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
85		return ret;
86	}
87	if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
88		dev_err(&client->dev, "MFR_ID unrecognised\n");
89		return -ENODEV;
90	}
91
92	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
93	if (ret < 0) {
94		dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
95		return ret;
96	}
97	if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
98		dev_err(&client->dev, "MFR_MODEL unrecognised\n");
99		return -ENODEV;
100	}
101
102	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
103			    GFP_KERNEL);
104	if (!info)
105		return -ENOMEM;
106
107	info->read_word_data = ir35221_read_word_data;
108
109	info->pages = 2;
110	info->format[PSC_VOLTAGE_IN] = linear;
111	info->format[PSC_VOLTAGE_OUT] = linear;
112	info->format[PSC_CURRENT_IN] = linear;
113	info->format[PSC_CURRENT_OUT] = linear;
114	info->format[PSC_POWER] = linear;
115	info->format[PSC_TEMPERATURE] = linear;
116
117	info->func[0] = PMBUS_HAVE_VIN
118		| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
119		| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
120		| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
121		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
122		| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
123	info->func[1] = info->func[0];
124
125	return pmbus_do_probe(client, info);
126}
127
128static const struct i2c_device_id ir35221_id[] = {
129	{"ir35221", 0},
130	{}
131};
132
133MODULE_DEVICE_TABLE(i2c, ir35221_id);
134
135static struct i2c_driver ir35221_driver = {
136	.driver = {
137		.name	= "ir35221",
138	},
139	.probe		= ir35221_probe,
140	.id_table	= ir35221_id,
141};
142
143module_i2c_driver(ir35221_driver);
144
145MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
146MODULE_DESCRIPTION("PMBus driver for IR35221");
147MODULE_LICENSE("GPL");
148MODULE_IMPORT_NS(PMBUS);
149