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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Delta AHE-50DC power shelf fan control module driver
*
* Copyright 2021 Zev Weiss <zev@bewilderbeest.net>
*/
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include "pmbus.h"
#define AHE50DC_PMBUS_READ_TEMP4 0xd0
static int ahe50dc_fan_write_byte(struct i2c_client *client, int page, u8 value)
{
/*
* The CLEAR_FAULTS operation seems to sometimes (unpredictably, perhaps
* 5% of the time or so) trigger a problematic phenomenon in which the
* fan speeds surge momentarily and at least some (perhaps all?) of the
* system's power outputs experience a glitch.
*
* However, according to Delta it should be OK to simply not send any
* CLEAR_FAULTS commands (the device doesn't seem to be capable of
* reporting any faults anyway), so just blackhole them unconditionally.
*/
return value == PMBUS_CLEAR_FAULTS ? -EOPNOTSUPP : -ENODATA;
}
static int ahe50dc_fan_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
/* temp1 in (virtual) page 1 is remapped to mfr-specific temp4 */
if (page == 1) {
if (reg == PMBUS_READ_TEMPERATURE_1)
return i2c_smbus_read_word_data(client, AHE50DC_PMBUS_READ_TEMP4);
return -EOPNOTSUPP;
}
/*
* There's a fairly limited set of commands this device actually
* supports, so here we block attempts to read anything else (which
* return 0xffff and would cause confusion elsewhere).
*/
switch (reg) {
case PMBUS_STATUS_WORD:
case PMBUS_FAN_COMMAND_1:
case PMBUS_FAN_COMMAND_2:
case PMBUS_FAN_COMMAND_3:
case PMBUS_FAN_COMMAND_4:
case PMBUS_STATUS_FAN_12:
case PMBUS_STATUS_FAN_34:
case PMBUS_READ_VIN:
case PMBUS_READ_TEMPERATURE_1:
case PMBUS_READ_TEMPERATURE_2:
case PMBUS_READ_TEMPERATURE_3:
case PMBUS_READ_FAN_SPEED_1:
case PMBUS_READ_FAN_SPEED_2:
case PMBUS_READ_FAN_SPEED_3:
case PMBUS_READ_FAN_SPEED_4:
return -ENODATA;
default:
return -EOPNOTSUPP;
}
}
static struct pmbus_driver_info ahe50dc_fan_info = {
.pages = 2,
.format[PSC_FAN] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_VOLTAGE_IN] = direct,
.m[PSC_FAN] = 1,
.b[PSC_FAN] = 0,
.R[PSC_FAN] = 0,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 1,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 3,
.func[0] = PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
PMBUS_HAVE_VIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_FAN34 |
PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_STATUS_FAN34 | PMBUS_PAGE_VIRTUAL,
.func[1] = PMBUS_HAVE_TEMP | PMBUS_PAGE_VIRTUAL,
.write_byte = ahe50dc_fan_write_byte,
.read_word_data = ahe50dc_fan_read_word_data,
};
/*
* CAPABILITY returns 0xff, which appears to be this device's way indicating
* it doesn't support something (and if we enable I2C_CLIENT_PEC on seeing bit
* 7 being set it generates bad PECs, so let's not go there).
*/
static struct pmbus_platform_data ahe50dc_fan_data = {
.flags = PMBUS_NO_CAPABILITY,
};
static int ahe50dc_fan_probe(struct i2c_client *client)
{
client->dev.platform_data = &ahe50dc_fan_data;
return pmbus_do_probe(client, &ahe50dc_fan_info);
}
static const struct i2c_device_id ahe50dc_fan_id[] = {
{ "ahe50dc_fan" },
{ }
};
MODULE_DEVICE_TABLE(i2c, ahe50dc_fan_id);
static const struct of_device_id __maybe_unused ahe50dc_fan_of_match[] = {
{ .compatible = "delta,ahe50dc-fan" },
{ }
};
MODULE_DEVICE_TABLE(of, ahe50dc_fan_of_match);
static struct i2c_driver ahe50dc_fan_driver = {
.driver = {
.name = "ahe50dc_fan",
.of_match_table = of_match_ptr(ahe50dc_fan_of_match),
},
.probe = ahe50dc_fan_probe,
.id_table = ahe50dc_fan_id,
};
module_i2c_driver(ahe50dc_fan_driver);
MODULE_AUTHOR("Zev Weiss <zev@bewilderbeest.net>");
MODULE_DESCRIPTION("Driver for Delta AHE-50DC power shelf fan control module");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");
|
