summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/max34440
blob: 9ba6587b76573e5cfd0d0fa4c05dcf2c27e95e05 (plain)
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
Kernel driver max34440
======================

Supported chips:
  * Maxim MAX34440
    Prefixes: 'max34440'
    Addresses scanned: -
    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34440.pdf
  * Maxim MAX34441
    PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
    Prefixes: 'max34441'
    Addresses scanned: -
    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34441.pdf
  * Maxim MAX34446
    PMBus Power-Supply Data Logger
    Prefixes: 'max34446'
    Addresses scanned: -
    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34446.pdf
  * Maxim MAX34460
    PMBus 12-Channel Voltage Monitor & Sequencer
    Prefix: 'max34460'
    Addresses scanned: -
    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34460.pdf
  * Maxim MAX34461
    PMBus 16-Channel Voltage Monitor & Sequencer
    Prefix: 'max34461'
    Addresses scanned: -
    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34461.pdf

Author: Guenter Roeck <linux@roeck-us.net>


Description
-----------

This driver supports hardware monitoring for Maxim MAX34440 PMBus 6-Channel
Power-Supply Manager, MAX34441 PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller, and MAX34446 PMBus Power-Supply Data Logger.
It also supports the MAX34460 and MAX34461 PMBus Voltage Monitor & Sequencers.
The MAX34460 supports 12 voltage channels, and the MAX34461 supports 16 voltage
channels.

The driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus for details on PMBus client drivers.


Usage Notes
-----------

This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices for
details.

For MAX34446, the value of the currX_crit attribute determines if current or
voltage measurement is enabled for a given channel. Voltage measurement is
enabled if currX_crit is set to 0; current measurement is enabled if the
attribute is set to a positive value. Power measurement is only enabled if
channel 1 (3) is configured for voltage measurement, and channel 2 (4) is
configured for current measurement.


Platform data support
---------------------

The driver supports standard PMBus driver platform data.


Sysfs entries
-------------

The following attributes are supported. Limits are read-write; all other
attributes are read-only.

in[1-6]_label		"vout[1-6]".
in[1-6]_input		Measured voltage. From READ_VOUT register.
in[1-6]_min		Minimum Voltage. From VOUT_UV_WARN_LIMIT register.
in[1-6]_max		Maximum voltage. From VOUT_OV_WARN_LIMIT register.
in[1-6]_lcrit		Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.
in[1-6]_crit		Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
in[1-6]_min_alarm	Voltage low alarm. From VOLTAGE_UV_WARNING status.
in[1-6]_max_alarm	Voltage high alarm. From VOLTAGE_OV_WARNING status.
in[1-6]_lcrit_alarm	Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
in[1-6]_crit_alarm	Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
in[1-6]_lowest		Historical minimum voltage.
in[1-6]_highest		Historical maximum voltage.
in[1-6]_reset_history	Write any value to reset history.

			MAX34446 only supports in[1-4].

curr[1-6]_label		"iout[1-6]".
curr[1-6]_input		Measured current. From READ_IOUT register.
curr[1-6]_max		Maximum current. From IOUT_OC_WARN_LIMIT register.
curr[1-6]_crit		Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
curr[1-6]_max_alarm	Current high alarm. From IOUT_OC_WARNING status.
curr[1-6]_crit_alarm	Current critical high alarm. From IOUT_OC_FAULT status.
curr[1-4]_average	Historical average current (MAX34446 only).
curr[1-6]_highest	Historical maximum current.
curr[1-6]_reset_history	Write any value to reset history.

			in6 and curr6 attributes only exist for MAX34440.
			MAX34446 only supports curr[1-4].

power[1,3]_label	"pout[1,3]"
power[1,3]_input	Measured power.
power[1,3]_average	Historical average power.
power[1,3]_highest	Historical maximum power.

			Power attributes only exist for MAX34446.

temp[1-8]_input		Measured temperatures. From READ_TEMPERATURE_1 register.
			temp1 is the chip's internal temperature. temp2..temp5
			are remote I2C temperature sensors. For MAX34441, temp6
			is a remote thermal-diode sensor. For MAX34440, temp6..8
			are remote I2C temperature sensors.
temp[1-8]_max		Maximum temperature. From OT_WARN_LIMIT register.
temp[1-8]_crit		Critical high temperature. From OT_FAULT_LIMIT register.
temp[1-8]_max_alarm	Temperature high alarm.
temp[1-8]_crit_alarm	Temperature critical high alarm.
temp[1-8]_average	Historical average temperature (MAX34446 only).
temp[1-8]_highest	Historical maximum temperature.
temp[1-8]_reset_history	Write any value to reset history.

			temp7 and temp8 attributes only exist for MAX34440.
			MAX34446 only supports temp[1-3].

MAX34460 supports attribute groups in[1-12] and temp[1-5].
MAX34461 supports attribute groups in[1-16] and temp[1-5].
OpenPOWER on IntegriCloud