1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Hardware monitoring driver for Infineon PXE1610
*
* Copyright (c) 2019 Facebook Inc
*
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
#define PXE1610_NUM_PAGES 3
/* Identify chip parameters. */
static int pxe1610_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int i;
for (i = 0; i < PXE1610_NUM_PAGES; i++) {
if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) {
u8 vout_mode;
int ret;
/* Read the register with VOUT scaling value.*/
ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
if (ret < 0)
return ret;
vout_mode = ret & GENMASK(4, 0);
switch (vout_mode) {
case 1:
info->vrm_version[i] = vr12;
break;
case 2:
info->vrm_version[i] = vr13;
break;
default:
/*
* If prior pages are available limit operation
* to them
*/
if (i != 0) {
info->pages = i;
return 0;
}
return -ENODEV;
}
}
}
return 0;
}
static struct pmbus_driver_info pxe1610_info = {
.pages = PXE1610_NUM_PAGES,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_POWER] = linear,
.func[0] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.func[1] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.func[2] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.identify = pxe1610_identify,
};
static int pxe1610_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
u8 buf[I2C_SMBUS_BLOCK_MAX];
int ret;
if (!i2c_check_functionality(
client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
| I2C_FUNC_SMBUS_READ_WORD_DATA
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
return -ENODEV;
/*
* By default this device doesn't boot to page 0, so set page 0
* to access all pmbus registers.
*/
i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
/* Read Manufacturer id */
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
return ret;
}
if (ret != 2 || strncmp(buf, "XP", 2)) {
dev_err(&client->dev, "MFR_ID unrecognized\n");
return -ENODEV;
}
info = devm_kmemdup(&client->dev, &pxe1610_info,
sizeof(struct pmbus_driver_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id pxe1610_id[] = {
{"pxe1610"},
{"pxe1110"},
{"pxm1310"},
{}
};
MODULE_DEVICE_TABLE(i2c, pxe1610_id);
static struct i2c_driver pxe1610_driver = {
.driver = {
.name = "pxe1610",
},
.probe = pxe1610_probe,
.id_table = pxe1610_id,
};
module_i2c_driver(pxe1610_driver);
MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");
|
