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
152
153
154
155
156
157
158
|
/*
* Hardware monitoring driver for Maxim MAX8688
*
* Copyright (c) 2011 Ericsson AB.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include "pmbus.h"
#define MAX8688_MFG_STATUS 0xd8
#define MAX8688_STATUS_OC_FAULT (1 << 4)
#define MAX8688_STATUS_OV_FAULT (1 << 5)
#define MAX8688_STATUS_OV_WARNING (1 << 8)
#define MAX8688_STATUS_UV_FAULT (1 << 9)
#define MAX8688_STATUS_UV_WARNING (1 << 10)
#define MAX8688_STATUS_UC_FAULT (1 << 11)
#define MAX8688_STATUS_OC_WARNING (1 << 12)
#define MAX8688_STATUS_OT_FAULT (1 << 13)
#define MAX8688_STATUS_OT_WARNING (1 << 14)
static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret = 0;
int mfg_status;
if (page)
return -EINVAL;
switch (reg) {
case PMBUS_STATUS_VOUT:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_UV_WARNING)
ret |= PB_VOLTAGE_UV_WARNING;
if (mfg_status & MAX8688_STATUS_UV_FAULT)
ret |= PB_VOLTAGE_UV_FAULT;
if (mfg_status & MAX8688_STATUS_OV_WARNING)
ret |= PB_VOLTAGE_OV_WARNING;
if (mfg_status & MAX8688_STATUS_OV_FAULT)
ret |= PB_VOLTAGE_OV_FAULT;
break;
case PMBUS_STATUS_IOUT:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_UC_FAULT)
ret |= PB_IOUT_UC_FAULT;
if (mfg_status & MAX8688_STATUS_OC_WARNING)
ret |= PB_IOUT_OC_WARNING;
if (mfg_status & MAX8688_STATUS_OC_FAULT)
ret |= PB_IOUT_OC_FAULT;
break;
case PMBUS_STATUS_TEMPERATURE:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_OT_WARNING)
ret |= PB_TEMP_OT_WARNING;
if (mfg_status & MAX8688_STATUS_OT_FAULT)
ret |= PB_TEMP_OT_FAULT;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static struct pmbus_driver_info max8688_info = {
.pages = 1,
.direct[PSC_VOLTAGE_IN] = true,
.direct[PSC_VOLTAGE_OUT] = true,
.direct[PSC_TEMPERATURE] = true,
.direct[PSC_CURRENT_OUT] = true,
.m[PSC_VOLTAGE_IN] = 19995,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = -1,
.m[PSC_VOLTAGE_OUT] = 19995,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = -1,
.m[PSC_CURRENT_OUT] = 23109,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = -2,
.m[PSC_TEMPERATURE] = -7612,
.b[PSC_TEMPERATURE] = 335,
.R[PSC_TEMPERATURE] = -3,
.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = max8688_read_byte_data,
};
static int max8688_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
return pmbus_do_probe(client, id, &max8688_info);
}
static int max8688_remove(struct i2c_client *client)
{
return pmbus_do_remove(client);
}
static const struct i2c_device_id max8688_id[] = {
{"max8688", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, max8688_id);
/* This is the driver that will be inserted */
static struct i2c_driver max8688_driver = {
.driver = {
.name = "max8688",
},
.probe = max8688_probe,
.remove = max8688_remove,
.id_table = max8688_id,
};
static int __init max8688_init(void)
{
return i2c_add_driver(&max8688_driver);
}
static void __exit max8688_exit(void)
{
i2c_del_driver(&max8688_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
MODULE_LICENSE("GPL");
module_init(max8688_init);
module_exit(max8688_exit);
|
