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-Kernel driver ltc4245
-Supported chips:
- * Linear Technology LTC4245
- Prefix: 'ltc4245'
- Addresses scanned: 0x20-0x3f
- Datasheet:
-Author: Ira W. Snyder <>
-The LTC4245 controller allows a board to be safely inserted and removed
-from a live backplane in multiple supply systems such as CompactPCI and
-PCI Express.
-Usage Notes
-This driver does not probe for LTC4245 devices, due to the fact that some
-of the possible addresses are unfriendly to probing. You will have to
-instantiate the devices explicitly.
-Example: the following will load the driver for an LTC4245 at address 0x23
-on I2C bus #1:
-$ modprobe ltc4245
-$ echo ltc4245 0x23 > /sys/bus/i2c/devices/i2c-1/new_device
-Sysfs entries
-The LTC4245 has built-in limits for over and under current warnings. This
-makes it very likely that the reference circuit will be used.
-This driver uses the values in the datasheet to change the register values
-into the values specified in the sysfs-interface document. The current readings
-rely on the sense resistors listed in Table 2: "Sense Resistor Values".
-in1_input 12v input voltage (mV)
-in2_input 5v input voltage (mV)
-in3_input 3v input voltage (mV)
-in4_input Vee (-12v) input voltage (mV)
-in1_min_alarm 12v input undervoltage alarm
-in2_min_alarm 5v input undervoltage alarm
-in3_min_alarm 3v input undervoltage alarm
-in4_min_alarm Vee (-12v) input undervoltage alarm
-curr1_input 12v current (mA)
-curr2_input 5v current (mA)
-curr3_input 3v current (mA)
-curr4_input Vee (-12v) current (mA)
-curr1_max_alarm 12v overcurrent alarm
-curr2_max_alarm 5v overcurrent alarm
-curr3_max_alarm 3v overcurrent alarm
-curr4_max_alarm Vee (-12v) overcurrent alarm
-in5_input 12v output voltage (mV)
-in6_input 5v output voltage (mV)
-in7_input 3v output voltage (mV)
-in8_input Vee (-12v) output voltage (mV)
-in5_min_alarm 12v output undervoltage alarm
-in6_min_alarm 5v output undervoltage alarm
-in7_min_alarm 3v output undervoltage alarm
-in8_min_alarm Vee (-12v) output undervoltage alarm
-in9_input GPIO voltage data (see note 1)
-in10_input GPIO voltage data (see note 1)
-in11_input GPIO voltage data (see note 1)
-power1_input 12v power usage (mW)
-power2_input 5v power usage (mW)
-power3_input 3v power usage (mW)
-power4_input Vee (-12v) power usage (mW)
-Note 1
-If you have NOT configured the driver to sample all GPIO pins as analog
-voltages, then the in10_input and in11_input sysfs attributes will not be
-created. The driver will sample the GPIO pin that is currently connected to the
-ADC as an analog voltage, and report the value in in9_input.
-If you have configured the driver to sample all GPIO pins as analog voltages,
-then they will be sampled in round-robin fashion. If userspace reads too
-slowly, -EAGAIN will be returned when you read the sysfs attribute containing
-the sensor reading.
-The LTC4245 chip can be configured to sample all GPIO pins with two methods:
-1) platform data -- see include/linux/i2c/ltc4245.h
-2) OF device tree -- add the "ltc4245,use-extra-gpios" property to each chip
-The default mode of operation is to sample a single GPIO pin.