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diff --git a/Documentation/hwmon/ltc4260.rst b/Documentation/hwmon/ltc4260.rst new file mode 100644 index 000000000000..4c335b6a51d1 --- /dev/null +++ b/Documentation/hwmon/ltc4260.rst @@ -0,0 +1,64 @@ +Kernel driver ltc4260 +===================== + +Supported chips: + + * Linear Technology LTC4260 + + Prefix: 'ltc4260' + + Addresses scanned: - + + Datasheet: + + http://cds.linear.com/docs/en/datasheet/4260fc.pdf + +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 +======================= ======================= |