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Kernel driver max34440
Supported chips:
* Maxim MAX34440
Prefixes: 'max34440'
Addresses scanned: -
* Maxim MAX34441
PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
Prefixes: 'max34441'
Addresses scanned: -
* Maxim MAX34446
PMBus Power-Supply Data Logger
Prefixes: 'max34446'
Addresses scanned: -
Author: Guenter Roeck <>
This driver supports hardware montoring 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.
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
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].