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-Kernel driver ltc4261
-Supported chips:
- * Linear Technology LTC4261
- Prefix: 'ltc4261'
- Addresses scanned: -
- Datasheet:
-Author: Guenter Roeck <>
-The LTC4261/LTC4261-2 negative voltage Hot Swap controllers allow a board
-to be safely inserted and removed from a live backplane.
-Usage Notes
-This driver does not probe for LTC4261 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 LTC4261 at address 0x10
-on I2C bus #1:
-$ modprobe ltc4261
-$ echo ltc4261 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.
-The chip has two voltage sensors, but only one set of voltage alarm status bits.
-In many many designs, those alarms are associated with the ADIN2 sensor, due to
-the proximity of the ADIN2 pin to the OV pin. ADIN2 is, however, not available
-on all chip variants. To ensure that the alarm condition is reported to the user,
-report it with both voltage sensors.
-in1_input ADIN2 voltage (mV)
-in1_min_alarm ADIN/ADIN2 Undervoltage alarm
-in1_max_alarm ADIN/ADIN2 Overvoltage alarm
-in2_input ADIN voltage (mV)
-in2_min_alarm ADIN/ADIN2 Undervoltage alarm
-in2_max_alarm ADIN/ADIN2 Overvoltage alarm
-curr1_input SENSE current (mA)
-curr1_alarm SENSE overcurrent alarm