hwmon: (ltc2978) Add support for LTC2975
LTC2975 is mostly compatible to LTC2974, but supports input current and power measurement. Tested-by: Michael Jones <mike@proclivis.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
parent
15398566f0
commit
649ca820da
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@ -3,6 +3,7 @@ ltc2978
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Required properties:
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- compatible: should contain one of:
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* "lltc,ltc2974"
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* "lltc,ltc2975"
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* "lltc,ltc2977"
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* "lltc,ltc2978"
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* "lltc,ltc3880"
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@ -19,7 +20,7 @@ Optional properties:
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standard binding for regulators; see regulator.txt.
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Valid names of regulators depend on number of supplies supported per device:
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* ltc2974 : vout0 - vout3
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* ltc2974, ltc2975 : vout0 - vout3
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* ltc2977 : vout0 - vout7
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* ltc2978 : vout0 - vout7
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* ltc3880, ltc3882 : vout0 - vout1
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@ -6,6 +6,10 @@ Supported chips:
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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 LTC2975
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Prefix: 'ltc2975'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2975
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* Linear Technology LTC2977
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Prefix: 'ltc2977'
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Addresses scanned: -
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@ -42,7 +46,7 @@ Author: Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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LTC2974 is a quad digital power supply managers.
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LTC2974 and LTC2975 are quad digital power supply managers.
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LTC2978 is an octal power supply monitor.
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LTC2977 is a pin compatible replacement for LTC2978.
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LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
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@ -71,23 +75,23 @@ 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.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, and LTC2978 only.
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in1_lcrit Critical minimum input voltage.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, and LTC2978 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.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, and LTC2978 only.
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in1_lcrit_alarm Input voltage critical low alarm.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, and LTC2978 only.
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in1_crit_alarm Input voltage critical high alarm.
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in1_lowest Lowest input voltage.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, 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[N]_label "vout[1-8]".
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LTC2974: N=2-5
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LTC2974, LTC2975: N=2-5
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LTC2977: N=2-9
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LTC2978: N=2-9
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LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
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@ -101,13 +105,14 @@ 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]_lowest Lowest output voltage. LTC2974, LTC2975,
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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[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 LTC2974 and LTC2975, temp[1-4] report external
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temperatures, and temp5 reports the chip temperature.
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On LTC2977 and LTC2978, only one temperature measurement
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is supported and reports the chip temperature.
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On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
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@ -120,23 +125,24 @@ 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.
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LTC2974, LTC2977, and LTC2978 only.
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LTC2974, LTC2975, LTC2977, 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.
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LTC2974, LTC2977, and LTC2978 only.
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Not supported for chip temperature sensor on LTC2974.
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LTC2974, LTC2975, LTC2977, and LTC2978 only.
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Not supported for chip temperature sensor on LTC2974 and
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LTC2975.
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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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temperature sensor on LTC2974 and LTC2975.
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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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temperature sensor on LTC2974 and LTC2975.
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power1_label "pin". LTC3883 only.
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power1_input Measured input power.
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power[N]_label "pout[1-4]".
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LTC2974: N=1-4
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LTC2974, LTC2975: N=1-4
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LTC2977: Not supported
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LTC2978: Not supported
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LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
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@ -151,7 +157,7 @@ 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[N]_label "iout[1-4]".
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LTC2974: N=1-4
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LTC2974, LTC2975: N=1-4
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LTC2977: not supported
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LTC2978: not supported
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LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
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@ -159,10 +165,11 @@ curr[N]_label "iout[1-4]".
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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]_lcrit Critical low output current. LTC2974 and LTC2975 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]_lcrit_alarm Output current critical low alarm.
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LTC2974 and LTC2975 only.
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curr[N]_lowest Lowest output current. LTC2974 and LTC2975 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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@ -52,8 +52,8 @@ config SENSORS_LTC2978
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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 LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTC3887,
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and LTM4676.
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Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC3880, LTC3883,
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LTC3887, and LTM4676.
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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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@ -1,9 +1,8 @@
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/*
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* Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
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* LTC3883, LTC3887. and LTM4676
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* Hardware monitoring driver for LTC2978 and compatible chips.
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*
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* Copyright (c) 2011 Ericsson AB.
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* Copyright (c) 2013, 2014 Guenter Roeck
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* Copyright (c) 2013, 2014, 2015 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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@ -25,8 +24,8 @@
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#include <linux/regulator/driver.h>
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#include "pmbus.h"
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enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
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ltm4676 };
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enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
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ltc3887, ltm4676 };
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/* Common for all chips */
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#define LTC2978_MFR_VOUT_PEAK 0xdd
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@ -34,12 +33,12 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
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#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
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#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Not on LTC3882 */
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/* LTC2974, LCT2977, and LTC2978 */
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/* LTC2974, LTC2975, LCT2977, 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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/* LTC2974 only */
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/* LTC2974, LTC2975 */
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#define LTC2974_MFR_IOUT_PEAK 0xd7
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#define LTC2974_MFR_IOUT_MIN 0xd8
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@ -51,8 +50,15 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
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/* LTC3883 only */
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#define LTC3883_MFR_IIN_PEAK 0xe1
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/* LTC2975 only */
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#define LTC2975_MFR_IIN_PEAK 0xc4
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#define LTC2975_MFR_IIN_MIN 0xc5
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#define LTC2975_MFR_PIN_PEAK 0xc6
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#define LTC2975_MFR_PIN_MIN 0xc7
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#define LTC2974_ID_REV1 0x0212
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#define LTC2974_ID_REV2 0x0213
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#define LTC2975_ID 0x0223
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#define LTC2977_ID 0x0130
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#define LTC2978_ID_REV1 0x0121
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#define LTC2978_ID_REV2 0x0122
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@ -87,7 +93,8 @@ struct ltc2978_data {
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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_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
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u16 iin_max;
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u16 iin_min, iin_max;
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u16 pin_min, pin_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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@ -246,6 +253,60 @@ static int ltc2974_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 ltc2975_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, LTC2975_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_READ_IIN_MIN:
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ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_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->iin_min))
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data->iin_min = ret;
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ret = data->iin_min;
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}
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break;
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case PMBUS_VIRT_READ_PIN_MAX:
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ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_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->pin_max))
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data->pin_max = ret;
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ret = data->pin_max;
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}
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break;
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case PMBUS_VIRT_READ_PIN_MIN:
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ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_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->pin_min))
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data->pin_min = ret;
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ret = data->pin_min;
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}
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break;
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case PMBUS_VIRT_RESET_IIN_HISTORY:
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case PMBUS_VIRT_RESET_PIN_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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@ -337,7 +398,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
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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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data->iin_min = 0x7bff;
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ret = ltc2978_clear_peaks(client, 0, data->id);
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break;
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case PMBUS_VIRT_RESET_PIN_HISTORY:
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data->pin_max = 0x7c00;
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data->pin_min = 0x7bff;
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ret = ltc2978_clear_peaks(client, 0, 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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@ -372,6 +439,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
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static const struct i2c_device_id ltc2978_id[] = {
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{"ltc2974", ltc2974},
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{"ltc2975", ltc2975},
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{"ltc2977", ltc2977},
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{"ltc2978", ltc2978},
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{"ltc3880", ltc3880},
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@ -428,6 +496,8 @@ static int ltc2978_get_id(struct i2c_client *client)
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if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
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return ltc2974;
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else if (chip_id == LTC2975_ID)
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return ltc2975;
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else if (chip_id == LTC2977_ID)
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return ltc2977;
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else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
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@ -505,6 +575,19 @@ static int ltc2978_probe(struct i2c_client *client,
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
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}
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break;
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case ltc2975:
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info->read_word_data = ltc2975_read_word_data;
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info->pages = LTC2974_NUM_PAGES;
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info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
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| PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_TEMP2;
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for (i = 0; i < info->pages; i++) {
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info->func[i] |= PMBUS_HAVE_VOUT
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
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}
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break;
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case ltc2977:
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case ltc2978:
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info->read_word_data = ltc2978_read_word_data;
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@ -576,6 +659,7 @@ static int ltc2978_probe(struct i2c_client *client,
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#ifdef CONFIG_OF
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static const struct of_device_id ltc2978_of_match[] = {
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{ .compatible = "lltc,ltc2974" },
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{ .compatible = "lltc,ltc2975" },
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{ .compatible = "lltc,ltc2977" },
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{ .compatible = "lltc,ltc2978" },
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{ .compatible = "lltc,ltc3880" },
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@ -601,5 +685,5 @@ static struct i2c_driver ltc2978_driver = {
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module_i2c_driver(ltc2978_driver);
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");
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MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
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MODULE_LICENSE("GPL");
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