Kernel driver ltc4286

Supported chips:

Author: Delphine CC Chiu <Delphine_CC_Chiu@Wiwynn.com>

Description

This driver supports hardware monitoring for Analog Devices LTC4286 and LTC4287 Hot-Swap Controller and Digital Power Monitors.

LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board to be removed from or inserted into a live backplane. They also feature current and voltage readback via an integrated 12 bit analog-to-digital converter (ADC), accessed using a PMBus interface.

The driver is a client driver to the core PMBus driver. Please see Kernel driver 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 How to instantiate I2C devices for details.

The shunt value in micro-ohms can be set via device tree at compile-time. Please refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings if the device tree is used.

Platform data support

The driver supports standard PMBus driver platform data. Please see Kernel driver pmbus for details.

Sysfs entries

The following attributes are supported. Limits are read-write, history reset attributes are write-only, all other attributes are read-only.

in1_label

“vin”

in1_input

Measured voltage.

in1_alarm

Input voltage alarm.

in1_min

Minimum input voltage.

in1_max

Maximum input voltage.

in2_label

“vout1”

in2_input

Measured voltage.

in2_alarm

Output voltage alarm.

in2_min

Minimum output voltage.

in2_max

Maximum output voltage.

curr1_label

“iout1”

curr1_input

Measured current.

curr1_alarm

Output current alarm.

curr1_max

Maximum current.

power1_label

“pin”

power1_input

Input power.

power1_alarm

Input power alarm.

power1_max

Maximum poewr.

temp1_input

Chip temperature.

temp1_min

Minimum chip temperature.

temp1_max

Maximum chip temperature.

temp1_crit

Critical chip temperature.

temp1_alarm

Chip temperature alarm.