Kernel driver max34440
======================

Supported chips:

  * ADI ADPM12160

    Prefixes: 'adpm12160'

    Addresses scanned: -

    Datasheet: -

  * ADI ADPM12200

    Prefixes: 'adpm12200'

    Addresses scanned: -

    Datasheet: -

  * Maxim MAX34440

    Prefixes: 'max34440'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34440.pdf

  * Maxim MAX34441

    PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller

    Prefixes: 'max34441'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34441.pdf

  * Maxim MAX34446

    PMBus Power-Supply Data Logger

    Prefixes: 'max34446'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34446.pdf

  * Maxim MAX34451

    PMBus 16-Channel V/I Monitor and 12-Channel Sequencer/Marginer

    Prefixes: 'max34451'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34451.pdf

  * Maxim MAX34460

    PMBus 12-Channel Voltage Monitor & Sequencer

    Prefix: 'max34460'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34460.pdf

  * Maxim MAX34461

    PMBus 16-Channel Voltage Monitor & Sequencer

    Prefix: 'max34461'

    Addresses scanned: -

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max34461.pdf

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


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

This driver supports multiple devices: 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; PMBus Voltage Monitor and Sequencers for MAX34451, MAX34460, and
MAX34461; PMBus DC/DC Power Module ADPM12160, and ADPM12200. The MAX34451
supports monitoring voltage or current of 12 channels based on GIN pins. The
MAX34460 supports 12 voltage channels, and the MAX34461 supports 16 voltage
channels. The ADPM12160, and ADPM12200 also monitors both input and output
of voltage and current.

The driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus.rst 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.rst 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
~~

======================= =======================================================
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.
======================= =======================================================

.. note::

    - MAX34446 only supports in[1-4].
    - ADPM12160, and ADPM12200 only supports in[1-2]. Label is "vin1"
      and "vout1" respectively.

Curr
~~~~

======================= ========================================================
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 (MAX34446/34451 only).
curr[1-6]_highest	Historical maximum current.
curr[1-6]_reset_history	Write any value to reset history.
======================= ========================================================

.. note::

    - in6 and curr6 attributes only exist for MAX34440.
    - MAX34446 only supports curr[1-4].
    - For ADPM12160, and ADPM12200, curr[1] is "iin1" and curr[2-6]
      are "iout[1-5]".

Power
~~~~~

======================= ========================================================
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.
======================= ========================================================

.. note:: Power attributes only exist for MAX34446.

Temp
~~~~

======================= ========================================================
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.
======================= ========================================================


.. note::
   - temp7 and temp8 attributes only exist for MAX34440.
   - MAX34446 only supports temp[1-3].
   - ADPM12160, and ADPM12200 only supports temp[1].


.. note::

   - MAX34451 supports attribute groups in[1-16] (or curr[1-16] based on
     input pins) and temp[1-5].
   - MAX34460 supports attribute groups in[1-12] and temp[1-5].
   - MAX34461 supports attribute groups in[1-16] and temp[1-5].
