Kernel driver ltc2978

Supported chips:

• Linear Technology LTC2972

  Prefix: ‘ltc2972’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2972.html

• Linear Technology LTC2974

  Prefix: ‘ltc2974’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2974

• Linear Technology LTC2975

  Prefix: ‘ltc2975’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2975

• Linear Technology LTC2977

  Prefix: ‘ltc2977’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2977

• Linear Technology LTC2978, LTC2978A

  Prefix: ‘ltc2978’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2978

  https://www.analog.com/en/products/ltc2978a

• Linear Technology LTC2979

  Prefix: ‘ltc2979’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2979

• Linear Technology LTC2980

  Prefix: ‘ltc2980’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc2980

• Linear Technology LTC3880

  Prefix: ‘ltc3880’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3880

• Linear Technology LTC3882

  Prefix: ‘ltc3882’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3882

• Linear Technology LTC3883

  Prefix: ‘ltc3883’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3883

• Linear Technology LTC3884

  Prefix: ‘ltc3884’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3884

• Linear Technology LTC3886

  Prefix: ‘ltc3886’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3886

• Linear Technology LTC3887

  Prefix: ‘ltc3887’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3887

• Linear Technology LTC3889

  Prefix: ‘ltc3889’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc3889

• Linear Technology LTC7880

  Prefix: ‘ltc7880’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltc7880

• Linear Technology LTM2987

  Prefix: ‘ltm2987’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltm2987

• Linear Technology LTM4644

  Prefix: ‘ltm4644’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltm4644

• Linear Technology LTM4675

Prefix: ‘ltm4675’

Addresses scanned: -

Datasheet: https://www.analog.com/en/products/ltm4675

• Linear Technology LTM4676

  Prefix: ‘ltm4676’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltm4676

• Linear Technology LTM4677

  Prefix: ‘ltm4677’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltm4677

• Linear Technology LTM4678

  Prefix: ‘ltm4678’

  Addresses scanned: -

  Datasheet: https://www.analog.com/en/products/ltm4678

• Analog Devices LTM4680

  Prefix: ‘ltm4680’

  Addresses scanned: -

  Datasheet: https://www.analog.com/ltm4680

• Analog Devices LTM4686

  Prefix: ‘ltm4686’

  Addresses scanned: -

  Datasheet: https://www.analog.com/ltm4686

• Analog Devices LTM4700

  Prefix: ‘ltm4700’

  Addresses scanned: -

  Datasheet: https://www.analog.com/ltm4700

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

Description

• LTC2974 and LTC2975 are quad digital power supply managers.
• LTC2978 is an octal power supply monitor.
• LTC2977 is a pin compatible replacement for LTC2978.
• LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
• in a single die. The chip is instantiated and reported as two separate chips
• on two different I2C bus addresses.
• LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
• DC/DC controllers.
• LTC3883 is a single phase step-down DC/DC controller.
• LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
• additional components on a single die. The chip is instantiated and reported
• as two separate chips on two different I2C bus addresses.
• LTM4675 is a dual 9A or single 18A μModule regulator
• LTM4676 is a dual 13A or single 26A uModule regulator.
• LTM4686 is a dual 10A or single 20A uModule regulator.

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. LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only.
in1_lcrit	Critical minimum input voltage. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only.
in1_crit	Critical maximum input voltage.
in1_min_alarm	Input voltage low alarm.
in1_max_alarm	Input voltage high alarm. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only.
in1_lcrit_alarm	Input voltage critical low alarm. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, LTC2979 and LTM2987 only.
in1_crit_alarm	Input voltage critical high alarm.
in1_lowest	Lowest input voltage. LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and LTM2987 only.
in1_highest	Highest input voltage.
in1_reset_history	Reset input voltage history.
in[N]_label	“vout[1-8]”. LTC2972: N=2-3 LTC2974, LTC2975: N=2-5 LTC2977, LTC2979, LTC2980, LTM2987: N=2-9 LTC2978: N=2-9 LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889, LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=2-3 LTC3883: N=2
in[N]_input	Measured output voltage.
in[N]_min	Minimum output voltage.
in[N]_max	Maximum output voltage.
in[N]_lcrit	Critical minimum output voltage.
in[N]_crit	Critical maximum output voltage.
in[N]_min_alarm	Output voltage low alarm.
in[N]_max_alarm	Output voltage high alarm.
in[N]_lcrit_alarm	Output voltage critical low alarm.
in[N]_crit_alarm	Output voltage critical high alarm.
in[N]_lowest	Lowest output voltage. LTC2972, LTC2974, LTC2975,and LTC2978 only.
in[N]_highest	Highest output voltage.
in[N]_reset_history	Reset output voltage history.
temp[N]_input	Measured temperature. On LTC2972, temp[1-2] report external temperatures, and temp 3 reports the chip temperature. On LTC2974 and LTC2975, temp[1-4] report external temperatures, and temp5 reports the chip temperature. On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987, only one temperature measurement is supported and reports the chip temperature. On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, and LTM4700, temp1 and temp2 report external temperatures, and temp3 reports the chip temperature. On LTC3883, temp1 reports an external temperature, and temp2 reports the chip temperature.
temp[N]_min	Mimimum temperature. LTC2972, LTC2974, LCT2977, LTM2980, LTC2978, LTC2979, and LTM2987 only.
temp[N]_max	Maximum temperature.
temp[N]_lcrit	Critical low temperature.
temp[N]_crit	Critical high temperature.
temp[N]_min_alarm	Temperature low alarm. LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, LTC2979, and LTM2987 only.
temp[N]_max_alarm	Temperature high alarm.
temp[N]_lcrit_alarm	Temperature critical low alarm.
temp[N]_crit_alarm	Temperature critical high alarm.
temp[N]_lowest	Lowest measured temperature. LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, LTC2979, and LTM2987 only. Not supported for chip temperature sensor on LTC2974 and LTC2975.
temp[N]_highest	Highest measured temperature. Not supported for chip temperature sensor on LTC2974 and LTC2975.
temp[N]_reset_history	Reset temperature history. Not supported for chip temperature sensor on LTC2974 and LTC2975.
power1_label	“pin”. LTC3883 and LTC3886 only.
power1_input	Measured input power.
power[N]_label	“pout[1-4]”. LTC2972: N=1-2 LTC2974, LTC2975: N=1-4 LTC2977, LTC2979, LTC2980, LTM2987: Not supported LTC2978: Not supported LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=1-2 LTC3883: N=2
power[N]_input	Measured output power.
curr1_label	“iin”. LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, and LTM4700 only.
curr1_input	Measured input current.
curr1_max	Maximum input current.
curr1_max_alarm	Input current high alarm.
curr1_highest	Highest input current. LTC3883 and LTC3886 only.
curr1_reset_history	Reset input current history. LTC3883 and LTC3886 only.
curr[N]_label	“iout[1-4]”. LTC2972: N-1-2 LTC2974, LTC2975: N=1-4 LTC2977, LTC2979, LTC2980, LTM2987: not supported LTC2978: not supported LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889, LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700: N=2-3 LTC3883: N=2
curr[N]_input	Measured output current.
curr[N]_max	Maximum output current.
curr[N]_crit	Critical high output current.
curr[N]_lcrit	Critical low output current. LTC2972, LTC2974 and LTC2975 only.
curr[N]_max_alarm	Output current high alarm.
curr[N]_crit_alarm	Output current critical high alarm.
curr[N]_lcrit_alarm	Output current critical low alarm. LTC2972, LTC2974 and LTC2975 only.
curr[N]_lowest	Lowest output current. LTC2972, LTC2974 and LTC2975 only.
curr[N]_highest	Highest output current.
curr[N]_reset_history	Reset output current history.