Documentation/hwmon/ltc2978

Kernel driver ltc2978
=====================

Supported chips:
  * Linear Technology LTC2978
    Prefix: 'ltc2978'
    Addresses scanned: -
    Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
  * Linear Technology LTC3880
    Prefix: 'ltc3880'
    Addresses scanned: -
    Datasheet: http://cds.linear.com/docs/Datasheet/3880f.pdf

Author: Guenter Roeck <guenter.roeck@ericsson.com>


Description
-----------

The LTC2978 is an octal power supply monitor, supervisor, sequencer and
margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
step-down switching regulator controller.


Usage Notes
-----------

This driver does not probe for PMBus devices. You will have to instantiate
devices explicitly.

Example: the following commands will load the driver for an LTC2978 at address
0x60 on I2C bus #1:

# modprobe ltc2978
# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device


Sysfs attributes
----------------

in1_label		"vin"
in1_input		Measured input voltage.
in1_min			Minimum input voltage.
in1_max			Maximum input voltage.
in1_lcrit		Critical minimum input voltage.
in1_crit		Critical maximum input voltage.
in1_min_alarm		Input voltage low alarm.
in1_max_alarm		Input voltage high alarm.
in1_lcrit_alarm		Input voltage critical low alarm.
in1_crit_alarm		Input voltage critical high alarm.
in1_lowest		Lowest input voltage. LTC2978 only.
in1_highest		Highest input voltage.
in1_reset_history	Reset history. Writing into this attribute will reset
			history for all attributes.

in[2-9]_label		"vout[1-8]". Channels 3 to 9 on LTC2978 only.
in[2-9]_input		Measured output voltage.
in[2-9]_min		Minimum output voltage.
in[2-9]_max		Maximum output voltage.
in[2-9]_lcrit		Critical minimum output voltage.
in[2-9]_crit		Critical maximum output voltage.
in[2-9]_min_alarm	Output voltage low alarm.
in[2-9]_max_alarm	Output voltage high alarm.
in[2-9]_lcrit_alarm	Output voltage critical low alarm.
in[2-9]_crit_alarm	Output voltage critical high alarm.
in[2-9]_lowest		Lowest output voltage. LTC2978 only.
in[2-9]_highest		Lowest output voltage.
in[2-9]_reset_history	Reset history. Writing into this attribute will reset
			history for all attributes.

temp[1-3]_input		Measured temperature.
			On LTC2978, only one temperature measurement is
			supported and reflects the internal temperature.
			On LTC3880, temp1 and temp2 report external
			temperatures, and temp3 reports the internal
			temperature.
temp[1-3]_min		Mimimum temperature.
temp[1-3]_max		Maximum temperature.
temp[1-3]_lcrit		Critical low temperature.
temp[1-3]_crit		Critical high temperature.
temp[1-3]_min_alarm	Chip temperature low alarm.
temp[1-3]_max_alarm	Chip temperature high alarm.
temp[1-3]_lcrit_alarm	Chip temperature critical low alarm.
temp[1-3]_crit_alarm	Chip temperature critical high alarm.
temp[1-3]_lowest	Lowest measured temperature. LTC2978 only.
temp[1-3]_highest	Highest measured temperature.
temp[1-3]_reset_history	Reset history. Writing into this attribute will reset
			history for all attributes.

power[1-2]_label	"pout[1-2]". LTC3880 only.
power[1-2]_input	Measured power.

curr1_label		"iin". LTC3880 only.
curr1_input		Measured input current.
curr1_max		Maximum input current.
curr1_max_alarm		Input current high alarm.

curr[2-3]_label		"iout[1-2]". LTC3880 only.
curr[2-3]_input		Measured input current.
curr[2-3]_max		Maximum input current.
curr[2-3]_crit		Critical input current.
curr[2-3]_max_alarm	Input current high alarm.
curr[2-3]_crit_alarm	Input current critical high alarm.