Kernel driver ltc4260

Supported chips:

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

Description

The LTC4260 Hot Swap controller allows a board to be safely inserted and removed from a live backplane.

Usage Notes

This driver does not probe for LTC4260 devices, since there is no register which can be safely used to identify the chip. You will have to instantiate the devices explicitly.

Example: the following will load the driver for an LTC4260 at address 0x10 on I2C bus #1:

$ modprobe ltc4260
$ echo ltc4260 0x10 > /sys/bus/i2c/devices/i2c-1/new_device

Sysfs entries

Voltage readings provided by this driver are reported as obtained from the ADC registers. If a set of voltage divider resistors is installed, calculate the real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the value of the divider resistor against the measured voltage and R2 is the value of the divider resistor against Ground.

Current reading provided by this driver is reported as obtained from the ADC Current Sense register. The reported value assumes that a 1 mOhm sense resistor is installed. If a different sense resistor is installed, calculate the real current by dividing the reported value by the sense resistor value in mOhm.

in1_input

SOURCE voltage (mV)

in1_min_alarm

Undervoltage alarm

in1_max_alarm

Overvoltage alarm

in2_input

ADIN voltage (mV)

in2_alarm

Power bad alarm

curr1_input

SENSE current (mA)

curr1_alarm

SENSE overcurrent alarm