Kernel driver max34440
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======================
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Supported chips:
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* Maxim MAX34440
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Prefixes: 'max34440'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34440.pdf
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* Maxim MAX34441
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PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
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Prefixes: 'max34441'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34441.pdf
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* Maxim MAX34446
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PMBus Power-Supply Data Logger
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Prefixes: 'max34446'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34446.pdf
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* Maxim MAX34451
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PMBus 16-Channel V/I Monitor and 12-Channel Sequencer/Marginer
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Prefixes: 'max34451'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34451.pdf
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* Maxim MAX34460
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PMBus 12-Channel Voltage Monitor & Sequencer
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Prefix: 'max34460'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34460.pdf
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* Maxim MAX34461
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PMBus 16-Channel Voltage Monitor & Sequencer
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Prefix: 'max34461'
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Addresses scanned: -
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Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX34461.pdf
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Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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This driver supports hardware monitoring for Maxim MAX34440 PMBus 6-Channel
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Power-Supply Manager, MAX34441 PMBus 5-Channel Power-Supply Manager
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and Intelligent Fan Controller, and MAX34446 PMBus Power-Supply Data Logger.
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It also supports the MAX34451, MAX34460, and MAX34461 PMBus Voltage Monitor &
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Sequencers. The MAX34451 supports monitoring voltage or current of 12 channels
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based on GIN pins. The MAX34460 supports 12 voltage channels, and the MAX34461
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supports 16 voltage channels.
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The driver is a client driver to the core PMBus driver. Please see
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Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
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details.
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For MAX34446, the value of the currX_crit attribute determines if current or
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voltage measurement is enabled for a given channel. Voltage measurement is
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enabled if currX_crit is set to 0; current measurement is enabled if the
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attribute is set to a positive value. Power measurement is only enabled if
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channel 1 (3) is configured for voltage measurement, and channel 2 (4) is
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configured for current measurement.
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Platform data support
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---------------------
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The driver supports standard PMBus driver platform data.
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Sysfs entries
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-------------
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The following attributes are supported. Limits are read-write; all other
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attributes are read-only.
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In
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~~
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======================= =======================================================
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in[1-6]_label "vout[1-6]".
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in[1-6]_input Measured voltage. From READ_VOUT register.
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in[1-6]_min Minimum Voltage. From VOUT_UV_WARN_LIMIT register.
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in[1-6]_max Maximum voltage. From VOUT_OV_WARN_LIMIT register.
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in[1-6]_lcrit Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.
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in[1-6]_crit Critical maximum voltage. From VOUT_OV_FAULT_LIMIT
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register.
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in[1-6]_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
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in[1-6]_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
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in[1-6]_lcrit_alarm Voltage critical low alarm. From VOLTAGE_UV_FAULT
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status.
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in[1-6]_crit_alarm Voltage critical high alarm. From VOLTAGE_OV_FAULT
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status.
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in[1-6]_lowest Historical minimum voltage.
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in[1-6]_highest Historical maximum voltage.
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in[1-6]_reset_history Write any value to reset history.
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======================= =======================================================
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.. note:: MAX34446 only supports in[1-4].
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Curr
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~~~~
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======================= ========================================================
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curr[1-6]_label "iout[1-6]".
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curr[1-6]_input Measured current. From READ_IOUT register.
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curr[1-6]_max Maximum current. From IOUT_OC_WARN_LIMIT register.
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curr[1-6]_crit Critical maximum current. From IOUT_OC_FAULT_LIMIT
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register.
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curr[1-6]_max_alarm Current high alarm. From IOUT_OC_WARNING status.
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curr[1-6]_crit_alarm Current critical high alarm. From IOUT_OC_FAULT status.
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curr[1-4]_average Historical average current (MAX34446/34451 only).
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curr[1-6]_highest Historical maximum current.
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curr[1-6]_reset_history Write any value to reset history.
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======================= ========================================================
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.. note::
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- in6 and curr6 attributes only exist for MAX34440.
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- MAX34446 only supports curr[1-4].
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Power
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~~~~~
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======================= ========================================================
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power[1,3]_label "pout[1,3]"
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power[1,3]_input Measured power.
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power[1,3]_average Historical average power.
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power[1,3]_highest Historical maximum power.
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======================= ========================================================
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.. note:: Power attributes only exist for MAX34446.
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Temp
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~~~~
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======================= ========================================================
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temp[1-8]_input Measured temperatures. From READ_TEMPERATURE_1 register.
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temp1 is the chip's internal temperature. temp2..temp5
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are remote I2C temperature sensors. For MAX34441, temp6
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is a remote thermal-diode sensor. For MAX34440, temp6..8
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are remote I2C temperature sensors.
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temp[1-8]_max Maximum temperature. From OT_WARN_LIMIT register.
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temp[1-8]_crit Critical high temperature. From OT_FAULT_LIMIT register.
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temp[1-8]_max_alarm Temperature high alarm.
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temp[1-8]_crit_alarm Temperature critical high alarm.
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temp[1-8]_average Historical average temperature (MAX34446 only).
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temp[1-8]_highest Historical maximum temperature.
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temp[1-8]_reset_history Write any value to reset history.
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======================= ========================================================
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.. note::
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- temp7 and temp8 attributes only exist for MAX34440.
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- MAX34446 only supports temp[1-3].
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.. note::
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- MAX34451 supports attribute groups in[1-16] (or curr[1-16] based on
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input pins) and temp[1-5].
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- MAX34460 supports attribute groups in[1-12] and temp[1-5].
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- MAX34461 supports attribute groups in[1-16] and temp[1-5].
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