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 MAX34451
PMBus 16-Channel V/I Monitor and 12-Channel Sequencer/Marginer
Prefixes: 'max34451'
Addresses scanned: -
Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX34451.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 MAX34451, MAX34460, and MAX34461 PMBus Voltage Monitor & Sequencers. 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 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].
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].
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].
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].