hwmon: (pmbus/ltc2978) Add support for LTC2974 and LTC3883
Signed-off-by: Guenter Roeck <linux@roeck-us.net>hifive-unleashed-5.1
Guenter Roeck
parent
8c770f3a47
commit
fd9175d2f6
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@ -2,6 +2,10 @@ Kernel driver ltc2978
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=====================
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Supported chips:
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* Linear Technology LTC2974
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Prefix: 'ltc2974'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2974
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* Linear Technology LTC2978
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Prefix: 'ltc2978'
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Addresses scanned: -
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@ -10,6 +14,10 @@ Supported chips:
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Prefix: 'ltc3880'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3880
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* Linear Technology LTC3883
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Prefix: 'ltc3883'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3883
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Author: Guenter Roeck <linux@roeck-us.net>
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@ -17,9 +25,9 @@ Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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The LTC2978 is an octal power supply monitor, supervisor, sequencer and
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margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
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step-down switching regulator controller.
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LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
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monitor. LTC3880 is a dual output poly-phase step-down DC/DC controller. LTC3883
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is a single phase step-down DC/DC controller.
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Usage Notes
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@ -41,60 +49,90 @@ Sysfs attributes
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in1_label "vin"
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in1_input Measured input voltage.
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in1_min Minimum input voltage.
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in1_max Maximum input voltage. LTC2978 only.
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in1_lcrit Critical minimum input voltage. LTC2978 only.
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in1_max Maximum input voltage. LTC2974 and LTC2978 only.
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in1_lcrit Critical minimum input voltage. LTC2974 and LTC2978
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only.
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in1_crit Critical maximum input voltage.
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in1_min_alarm Input voltage low alarm.
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in1_max_alarm Input voltage high alarm. LTC2978 only.
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in1_lcrit_alarm Input voltage critical low alarm. LTC2978 only.
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in1_max_alarm Input voltage high alarm. LTC2974 and LTC2978 only.
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in1_lcrit_alarm Input voltage critical low alarm. LTC2974 and LTC2978
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only.
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in1_crit_alarm Input voltage critical high alarm.
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in1_lowest Lowest input voltage. LTC2978 only.
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in1_lowest Lowest input voltage. LTC2974 and LTC2978 only.
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in1_highest Highest input voltage.
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in1_reset_history Reset input voltage history.
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in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only.
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in[2-9]_input Measured output voltage.
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in[2-9]_min Minimum output voltage.
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in[2-9]_max Maximum output voltage.
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in[2-9]_lcrit Critical minimum output voltage.
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in[2-9]_crit Critical maximum output voltage.
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in[2-9]_min_alarm Output voltage low alarm.
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in[2-9]_max_alarm Output voltage high alarm.
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in[2-9]_lcrit_alarm Output voltage critical low alarm.
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in[2-9]_crit_alarm Output voltage critical high alarm.
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in[2-9]_lowest Lowest output voltage. LTC2978 only.
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in[2-9]_highest Lowest output voltage.
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in[2-9]_reset_history Reset output voltage history.
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in[N]_label "vout[1-8]".
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LTC2974: N=2-5
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LTC2978: N=2-9
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LTC3880: N=2-3
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LTC3883: N=2
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in[N]_input Measured output voltage.
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in[N]_min Minimum output voltage.
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in[N]_max Maximum output voltage.
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in[N]_lcrit Critical minimum output voltage.
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in[N]_crit Critical maximum output voltage.
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in[N]_min_alarm Output voltage low alarm.
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in[N]_max_alarm Output voltage high alarm.
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in[N]_lcrit_alarm Output voltage critical low alarm.
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in[N]_crit_alarm Output voltage critical high alarm.
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in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only.
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in[N]_highest Highest output voltage.
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in[N]_reset_history Reset output voltage history.
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temp[1-3]_input Measured temperature.
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temp[N]_input Measured temperature.
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On LTC2974, temp[1-4] report external temperatures,
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and temp5 reports the chip temperature.
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On LTC2978, only one temperature measurement is
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supported and reports the chip temperature.
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On LTC3880, temp1 and temp2 report external
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temperatures, and temp3 reports the chip
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temperature.
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temp[1-3]_min Mimimum temperature. LTC2978 only.
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temp[1-3]_max Maximum temperature.
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temp[1-3]_lcrit Critical low temperature.
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temp[1-3]_crit Critical high temperature.
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temp[1-3]_min_alarm Temperature low alarm. LTC2978 only.
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temp[1-3]_max_alarm Temperature high alarm.
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temp[1-3]_lcrit_alarm Temperature critical low alarm.
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temp[1-3]_crit_alarm Temperature critical high alarm.
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temp[1-3]_lowest Lowest measured temperature. LTC2978 only.
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temp[1-3]_highest Highest measured temperature.
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temp[1-3]_reset_history Reset temperature history.
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temperatures, and temp3 reports the chip temperature.
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On LTC3883, temp1 reports an external temperature,
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and temp2 reports the chip temperature.
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temp[N]_min Mimimum temperature. LTC2974 and LTC2978 only.
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temp[N]_max Maximum temperature.
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temp[N]_lcrit Critical low temperature.
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temp[N]_crit Critical high temperature.
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temp[N]_min_alarm Temperature low alarm. LTC2974 and LTC2978 only.
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temp[N]_max_alarm Temperature high alarm.
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temp[N]_lcrit_alarm Temperature critical low alarm.
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temp[N]_crit_alarm Temperature critical high alarm.
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temp[N]_lowest Lowest measured temperature. LTC2974 and LTC2978 only.
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Not supported for chip temperature sensor on LTC2974.
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temp[N]_highest Highest measured temperature. Not supported for chip
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temperature sensor on LTC2974.
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temp[N]_reset_history Reset temperature history. Not supported for chip
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temperature sensor on LTC2974.
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power[1-2]_label "pout[1-2]". LTC3880 only.
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power[1-2]_input Measured power.
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power1_label "pin". LTC3883 only.
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power1_input Measured input power.
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curr1_label "iin". LTC3880 only.
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power[N]_label "pout[1-4]".
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LTC2974: N=1-4
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LTC2978: Not supported
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LTC3880: N=1-2
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LTC3883: N=2
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power[N]_input Measured output power.
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curr1_label "iin". LTC3880 and LTC3883 only.
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curr1_input Measured input current.
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curr1_max Maximum input current.
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curr1_max_alarm Input current high alarm.
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curr1_highest Highest input current. LTC3883 only.
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curr1_reset_history Reset input current history. LTC3883 only.
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curr[2-3]_label "iout[1-2]". LTC3880 only.
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curr[2-3]_input Measured output current.
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curr[2-3]_max Maximum output current.
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curr[2-3]_crit Critical output current.
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curr[2-3]_max_alarm Output current high alarm.
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curr[2-3]_crit_alarm Output current critical high alarm.
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curr[N]_label "iout[1-4]".
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LTC2974: N=1-4
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LTC2978: not supported
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LTC3880: N=2-3
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LTC3883: N=2
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curr[N]_input Measured output current.
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curr[N]_max Maximum output current.
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curr[N]_crit Critical high output current.
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curr[N]_lcrit Critical low output current. LTC2974 only.
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curr[N]_max_alarm Output current high alarm.
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curr[N]_crit_alarm Output current critical high alarm.
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curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only.
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curr[N]_lowest Lowest output current. LTC2974 only.
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curr[N]_highest Highest output current.
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curr[N]_reset_history Reset output current history.
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@ -48,11 +48,11 @@ config SENSORS_LM25066
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be called lm25066.
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config SENSORS_LTC2978
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tristate "Linear Technologies LTC2978 and LTC3880"
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tristate "Linear Technologies LTC2974, LTC2978, LTC3880, and LTC3883"
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default n
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help
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If you say yes here you get hardware monitoring support for Linear
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Technology LTC2978 and LTC3880.
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Technology LTC2974, LTC2978, LTC3880, and LTC3883.
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This driver can also be built as a module. If so, the module will
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be called ltc2978.
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@ -1,7 +1,8 @@
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/*
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* Hardware monitoring driver for LTC2978 and LTC3880
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* Hardware monitoring driver for LTC2974, LTC2978, LTC3880, and LTC3883
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*
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* Copyright (c) 2011 Ericsson AB.
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* Copyright (c) 2013 Guenter Roeck
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -26,31 +27,43 @@
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#include <linux/i2c.h>
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#include "pmbus.h"
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enum chips { ltc2978, ltc3880 };
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enum chips { ltc2974, ltc2978, ltc3880, ltc3883 };
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/* LTC2978 and LTC3880 */
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/* Common for all chips */
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#define LTC2978_MFR_VOUT_PEAK 0xdd
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#define LTC2978_MFR_VIN_PEAK 0xde
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#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
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#define LTC2978_MFR_SPECIAL_ID 0xe7
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/* LTC2978 only */
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/* LTC2974 and LTC2978 */
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#define LTC2978_MFR_VOUT_MIN 0xfb
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#define LTC2978_MFR_VIN_MIN 0xfc
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#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
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/* LTC3880 only */
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/* LTC2974 only */
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#define LTC2974_MFR_IOUT_PEAK 0xd7
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#define LTC2974_MFR_IOUT_MIN 0xd8
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/* LTC3880 and LTC3883 */
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#define LTC3880_MFR_IOUT_PEAK 0xd7
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#define LTC3880_MFR_CLEAR_PEAKS 0xe3
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#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
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/* LTC3883 only */
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#define LTC3883_MFR_IIN_PEAK 0xe1
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#define LTC2974_ID 0x0212
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#define LTC2978_ID_REV1 0x0121
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#define LTC2978_ID_REV2 0x0122
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#define LTC3880_ID 0x4000
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#define LTC3880_ID_MASK 0xff00
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#define LTC3883_ID 0x4300
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#define LTC3883_ID_MASK 0xff00
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#define LTC2974_NUM_PAGES 4
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#define LTC2978_NUM_PAGES 8
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#define LTC3880_NUM_PAGES 2
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#define LTC3883_NUM_PAGES 1
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/*
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* LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
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@ -63,9 +76,10 @@ enum chips { ltc2978, ltc3880 };
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struct ltc2978_data {
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enum chips id;
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u16 vin_min, vin_max;
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u16 temp_min, temp_max[LTC3880_NUM_PAGES];
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u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
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u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
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u16 iout_max[LTC3880_NUM_PAGES];
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u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
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u16 iin_max;
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u16 temp2_max;
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struct pmbus_driver_info info;
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};
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@ -171,9 +185,9 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
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LTC2978_MFR_TEMPERATURE_MIN);
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if (ret >= 0) {
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if (lin11_to_val(ret)
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< lin11_to_val(data->temp_min))
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data->temp_min = ret;
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ret = data->temp_min;
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< lin11_to_val(data->temp_min[page]))
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data->temp_min[page] = ret;
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ret = data->temp_min[page];
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}
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break;
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case PMBUS_VIRT_READ_IOUT_MAX:
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@ -189,6 +203,41 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
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return ret;
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}
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static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_PEAK);
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if (ret >= 0) {
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if (lin11_to_val(ret)
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> lin11_to_val(data->iout_max[page]))
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data->iout_max[page] = ret;
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ret = data->iout_max[page];
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}
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break;
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case PMBUS_VIRT_READ_IOUT_MIN:
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ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_MIN);
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if (ret >= 0) {
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if (lin11_to_val(ret)
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< lin11_to_val(data->iout_min[page]))
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data->iout_min[page] = ret;
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ret = data->iout_min[page];
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}
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc2978_read_word_data(client, page, reg);
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break;
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}
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return ret;
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}
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static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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@ -230,15 +279,41 @@ static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
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return ret;
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}
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static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_IIN_MAX:
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ret = pmbus_read_word_data(client, page, LTC3883_MFR_IIN_PEAK);
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if (ret >= 0) {
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if (lin11_to_val(ret)
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> lin11_to_val(data->iin_max))
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data->iin_max = ret;
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ret = data->iin_max;
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}
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break;
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case PMBUS_VIRT_RESET_IIN_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc3880_read_word_data(client, page, reg);
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break;
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}
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return ret;
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}
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static int ltc2978_clear_peaks(struct i2c_client *client, int page,
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enum chips id)
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{
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int ret;
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if (id == ltc2978)
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ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
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else
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if (id == ltc3880 || id == ltc3883)
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ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
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else
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ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
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return ret;
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}
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@ -251,8 +326,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
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int ret;
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switch (reg) {
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case PMBUS_VIRT_RESET_IIN_HISTORY:
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data->iin_max = 0x7c00;
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ret = ltc2978_clear_peaks(client, page, data->id);
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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data->iout_max[page] = 0x7c00;
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data->iout_min[page] = 0xfbff;
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ret = ltc2978_clear_peaks(client, page, data->id);
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break;
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case PMBUS_VIRT_RESET_TEMP2_HISTORY:
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@ -270,7 +350,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
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ret = ltc2978_clear_peaks(client, page, data->id);
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break;
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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data->temp_min = 0x7bff;
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data->temp_min[page] = 0x7bff;
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data->temp_max[page] = 0x7c00;
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ret = ltc2978_clear_peaks(client, page, data->id);
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break;
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@ -282,8 +362,10 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
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}
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static const struct i2c_device_id ltc2978_id[] = {
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{"ltc2974", ltc2974},
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{"ltc2978", ltc2978},
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{"ltc3880", ltc3880},
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{"ltc3883", ltc3883},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ltc2978_id);
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@ -308,10 +390,14 @@ static int ltc2978_probe(struct i2c_client *client,
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if (chip_id < 0)
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return chip_id;
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if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
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if (chip_id == LTC2974_ID) {
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data->id = ltc2974;
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} else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
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data->id = ltc2978;
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||||
} else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
|
||||
data->id = ltc3880;
|
||||
} else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) {
|
||||
data->id = ltc3883;
|
||||
} else {
|
||||
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
|
||||
return -ENODEV;
|
||||
|
|
@ -329,12 +415,29 @@ static int ltc2978_probe(struct i2c_client *client,
|
|||
data->vin_max = 0x7c00;
|
||||
for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
|
||||
data->vout_min[i] = 0xffff;
|
||||
data->temp_min = 0x7bff;
|
||||
for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
|
||||
data->iout_min[i] = 0xfbff;
|
||||
for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
|
||||
data->iout_max[i] = 0x7c00;
|
||||
for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
|
||||
data->temp_min[i] = 0x7bff;
|
||||
for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
|
||||
data->temp_max[i] = 0x7c00;
|
||||
data->temp2_max = 0x7c00;
|
||||
|
||||
switch (data->id) {
|
||||
case ltc2974:
|
||||
info->read_word_data = ltc2974_read_word_data;
|
||||
info->pages = LTC2974_NUM_PAGES;
|
||||
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
|
||||
| PMBUS_HAVE_TEMP2;
|
||||
for (i = 0; i < info->pages; i++) {
|
||||
info->func[i] |= PMBUS_HAVE_VOUT
|
||||
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
|
||||
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
|
||||
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
|
||||
}
|
||||
break;
|
||||
case ltc2978:
|
||||
info->read_word_data = ltc2978_read_word_data;
|
||||
info->pages = LTC2978_NUM_PAGES;
|
||||
|
|
@ -359,8 +462,16 @@ static int ltc2978_probe(struct i2c_client *client,
|
|||
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
||||
| PMBUS_HAVE_POUT
|
||||
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
||||
data->iout_max[0] = 0x7c00;
|
||||
data->iout_max[1] = 0x7c00;
|
||||
break;
|
||||
case ltc3883:
|
||||
info->read_word_data = ltc3883_read_word_data;
|
||||
info->pages = LTC3883_NUM_PAGES;
|
||||
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
|
||||
| PMBUS_HAVE_STATUS_INPUT
|
||||
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
||||
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
||||
| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
||||
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
|
||||
break;
|
||||
default:
|
||||
return -ENODEV;
|
||||
|
|
@ -381,5 +492,5 @@ static struct i2c_driver ltc2978_driver = {
|
|||
module_i2c_driver(ltc2978_driver);
|
||||
|
||||
MODULE_AUTHOR("Guenter Roeck");
|
||||
MODULE_DESCRIPTION("PMBus driver for LTC2978 and LTC3880");
|
||||
MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, and LTC3883");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
|
|||
Loading…
Reference in New Issue