ltc2978
5.04 KB
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Kernel driver ltc2978
=====================
Supported chips:
* Linear Technology LTC2974
Prefix: 'ltc2974'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2974
* Linear Technology LTC2977
Prefix: 'ltc2977'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2977
* Linear Technology LTC2978, LTC2978A
Prefix: 'ltc2978'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2978
http://www.linear.com/product/ltc2978a
* Linear Technology LTC3880
Prefix: 'ltc3880'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc3880
* Linear Technology LTC3883
Prefix: 'ltc3883'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc3883
Author: Guenter Roeck <linux@roeck-us.net>
Description
-----------
LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual
output poly-phase step-down DC/DC controller. LTC3883 is a single phase
step-down DC/DC 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.
LTC2974, LTC2977, and LTC2978 only.
in1_lcrit Critical minimum input voltage.
LTC2974, LTC2977, and LTC2978 only.
in1_crit Critical maximum input voltage.
in1_min_alarm Input voltage low alarm.
in1_max_alarm Input voltage high alarm.
LTC2974, LTC2977, and LTC2978 only.
in1_lcrit_alarm Input voltage critical low alarm.
LTC2974, LTC2977, and LTC2978 only.
in1_crit_alarm Input voltage critical high alarm.
in1_lowest Lowest input voltage.
LTC2974, LTC2977, and LTC2978 only.
in1_highest Highest input voltage.
in1_reset_history Reset input voltage history.
in[N]_label "vout[1-8]".
LTC2974: N=2-5
LTC2977: N=2-9
LTC2978: N=2-9
LTC3880: 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. LTC2974 and LTC2978 only.
in[N]_highest Highest output voltage.
in[N]_reset_history Reset output voltage history.
temp[N]_input Measured temperature.
On LTC2974, temp[1-4] report external temperatures,
and temp5 reports the chip temperature.
On LTC2977 and LTC2978, only one temperature measurement
is supported and reports the chip temperature.
On LTC3880, 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. LTC2974, LCT2977, and LTC2978 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.
LTC2974, LTC2977, and LTC2978 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.
LTC2974, LTC2977, and LTC2978 only.
Not supported for chip temperature sensor on LTC2974.
temp[N]_highest Highest measured temperature. Not supported for chip
temperature sensor on LTC2974.
temp[N]_reset_history Reset temperature history. Not supported for chip
temperature sensor on LTC2974.
power1_label "pin". LTC3883 only.
power1_input Measured input power.
power[N]_label "pout[1-4]".
LTC2974: N=1-4
LTC2977: Not supported
LTC2978: Not supported
LTC3880: N=1-2
LTC3883: N=2
power[N]_input Measured output power.
curr1_label "iin". LTC3880 and LTC3883 only.
curr1_input Measured input current.
curr1_max Maximum input current.
curr1_max_alarm Input current high alarm.
curr1_highest Highest input current. LTC3883 only.
curr1_reset_history Reset input current history. LTC3883 only.
curr[N]_label "iout[1-4]".
LTC2974: N=1-4
LTC2977: not supported
LTC2978: not supported
LTC3880: 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. LTC2974 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. LTC2974 only.
curr[N]_lowest Lowest output current. LTC2974 only.
curr[N]_highest Highest output current.
curr[N]_reset_history Reset output current history.