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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 2015-06-08 09:56:20 -07:00
parent 15398566f0
commit 649ca820da
4 changed files with 125 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/hwmon/ltc2978.txt
View File

@ -3,6 +3,7 @@ ltc2978
Required properties:
- compatible: should contain one of:
* "lltc,ltc2974"
* "lltc,ltc2975"
* "lltc,ltc2977"
* "lltc,ltc2978"
* "lltc,ltc3880"
@ -19,7 +20,7 @@ Optional properties:
standard binding for regulators; see regulator.txt.
Valid names of regulators depend on number of supplies supported per device:
* ltc2974 : vout0 - vout3
* ltc2974, ltc2975 : vout0 - vout3
* ltc2977 : vout0 - vout7
* ltc2978 : vout0 - vout7
* ltc3880, ltc3882 : vout0 - vout1

47
Documentation/hwmon/ltc2978
View File

@ -6,6 +6,10 @@ Supported chips:
Prefix: 'ltc2974'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2974
* Linear Technology LTC2975
Prefix: 'ltc2975'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2975
* Linear Technology LTC2977
Prefix: 'ltc2977'
Addresses scanned: -
@ -42,7 +46,7 @@ Author: Guenter Roeck <linux@roeck-us.net>
Description
-----------
LTC2974 is a quad digital power supply managers.
LTC2974 and LTC2975 are quad digital power supply managers.
LTC2978 is an octal power supply monitor.
LTC2977 is a pin compatible replacement for LTC2978.
LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
@ -71,23 +75,23 @@ in1_label "vin"
in1_input Measured input voltage.
in1_min Minimum input voltage.
in1_max Maximum input voltage.
LTC2974, LTC2977, and LTC2978 only.
LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_lcrit Critical minimum input voltage.
LTC2974, LTC2977, and LTC2978 only.
LTC2974, LTC2975, 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.
LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_lcrit_alarm Input voltage critical low alarm.
LTC2974, LTC2977, and LTC2978 only.
LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_crit_alarm Input voltage critical high alarm.
in1_lowest Lowest input voltage.
LTC2974, LTC2977, and LTC2978 only.
LTC2974, LTC2975, 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
LTC2974, LTC2975: N=2-5
LTC2977: N=2-9
LTC2978: N=2-9
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@ -101,13 +105,14 @@ 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]_lowest Lowest output voltage. 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 LTC2974, temp[1-4] report external temperatures,
and temp5 reports the chip temperature.
On LTC2974 and LTC2975, 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, LTC3882, LTC3887, and LTM4676, temp1 and
@ -120,23 +125,24 @@ 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.
LTC2974, LTC2975, 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.
LTC2974, LTC2975, LTC2977, and LTC2978 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.
temperature sensor on LTC2974 and LTC2975.
temp[N]_reset_history Reset temperature history. Not supported for chip
temperature sensor on LTC2974.
temperature sensor on LTC2974 and LTC2975.
power1_label "pin". LTC3883 only.
power1_input Measured input power.
power[N]_label "pout[1-4]".
LTC2974: N=1-4
LTC2974, LTC2975: N=1-4
LTC2977: Not supported
LTC2978: Not supported
LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
@ -151,7 +157,7 @@ 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
LTC2974, LTC2975: N=1-4
LTC2977: not supported
LTC2978: not supported
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@ -159,10 +165,11 @@ curr[N]_label "iout[1-4]".
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]_lcrit Critical low output current. 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. LTC2974 only.
curr[N]_lowest Lowest output current. LTC2974 only.
curr[N]_lcrit_alarm Output current critical low alarm.
LTC2974 and LTC2975 only.
curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only.
curr[N]_highest Highest output current.
curr[N]_reset_history Reset output current history.

4
drivers/hwmon/pmbus/Kconfig
View File

@ -52,8 +52,8 @@ config SENSORS_LTC2978
default n
help
If you say yes here you get hardware monitoring support for Linear
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTC3887,
and LTM4676.
Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC3880, LTC3883,
LTC3887, and LTM4676.
This driver can also be built as a module. If so, the module will
be called ltc2978.

104
drivers/hwmon/pmbus/ltc2978.c
View File

@ -1,9 +1,8 @@
/*
* Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
* LTC3883, LTC3887. and LTM4676
* Hardware monitoring driver for LTC2978 and compatible chips.
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013, 2014 Guenter Roeck
* Copyright (c) 2013, 2014, 2015 Guenter Roeck
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -25,8 +24,8 @@
#include <linux/regulator/driver.h>
#include "pmbus.h"
enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
ltm4676 };
enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
ltc3887, ltm4676 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
@ -34,12 +33,12 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Not on LTC3882 */
/* LTC2974, LCT2977, and LTC2978 */
/* LTC2974, LTC2975, LCT2977, and LTC2978 */
#define LTC2978_MFR_VOUT_MIN 0xfb
#define LTC2978_MFR_VIN_MIN 0xfc
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
/* LTC2974 only */
/* LTC2974, LTC2975 */
#define LTC2974_MFR_IOUT_PEAK 0xd7
#define LTC2974_MFR_IOUT_MIN 0xd8
@ -51,8 +50,15 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
/* LTC3883 only */
#define LTC3883_MFR_IIN_PEAK 0xe1
/* LTC2975 only */
#define LTC2975_MFR_IIN_PEAK 0xc4
#define LTC2975_MFR_IIN_MIN 0xc5
#define LTC2975_MFR_PIN_PEAK 0xc6
#define LTC2975_MFR_PIN_MIN 0xc7
#define LTC2974_ID_REV1 0x0212
#define LTC2974_ID_REV2 0x0213
#define LTC2975_ID 0x0223
#define LTC2977_ID 0x0130
#define LTC2978_ID_REV1 0x0121
#define LTC2978_ID_REV2 0x0122
@ -87,7 +93,8 @@ struct ltc2978_data {
u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
u16 iin_max;
u16 iin_min, iin_max;
u16 pin_min, pin_max;
u16 temp2_max;
struct pmbus_driver_info info;
};
@ -246,6 +253,60 @@ static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
return ret;
}
static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct ltc2978_data *data = to_ltc2978_data(info);
int ret;
switch (reg) {
case PMBUS_VIRT_READ_IIN_MAX:
ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_PEAK);
if (ret >= 0) {
if (lin11_to_val(ret)
> lin11_to_val(data->iin_max))
data->iin_max = ret;
ret = data->iin_max;
}
break;
case PMBUS_VIRT_READ_IIN_MIN:
ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_MIN);
if (ret >= 0) {
if (lin11_to_val(ret)
< lin11_to_val(data->iin_min))
data->iin_min = ret;
ret = data->iin_min;
}
break;
case PMBUS_VIRT_READ_PIN_MAX:
ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_PEAK);
if (ret >= 0) {
if (lin11_to_val(ret)
> lin11_to_val(data->pin_max))
data->pin_max = ret;
ret = data->pin_max;
}
break;
case PMBUS_VIRT_READ_PIN_MIN:
ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_MIN);
if (ret >= 0) {
if (lin11_to_val(ret)
< lin11_to_val(data->pin_min))
data->pin_min = ret;
ret = data->pin_min;
}
break;
case PMBUS_VIRT_RESET_IIN_HISTORY:
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = 0;
break;
default:
ret = ltc2978_read_word_data(client, page, reg);
break;
}
return ret;
}
static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
@ -337,7 +398,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
switch (reg) {
case PMBUS_VIRT_RESET_IIN_HISTORY:
data->iin_max = 0x7c00;
ret = ltc2978_clear_peaks(client, page, data->id);
data->iin_min = 0x7bff;
ret = ltc2978_clear_peaks(client, 0, data->id);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
data->pin_max = 0x7c00;
data->pin_min = 0x7bff;
ret = ltc2978_clear_peaks(client, 0, data->id);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
data->iout_max[page] = 0x7c00;
@ -372,6 +439,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
static const struct i2c_device_id ltc2978_id[] = {
{"ltc2974", ltc2974},
{"ltc2975", ltc2975},
{"ltc2977", ltc2977},
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
@ -428,6 +496,8 @@ static int ltc2978_get_id(struct i2c_client *client)
if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
return ltc2974;
else if (chip_id == LTC2975_ID)
return ltc2975;
else if (chip_id == LTC2977_ID)
return ltc2977;
else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
@ -505,6 +575,19 @@ static int ltc2978_probe(struct i2c_client *client,
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
}
break;
case ltc2975:
info->read_word_data = ltc2975_read_word_data;
info->pages = LTC2974_NUM_PAGES;
info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
| 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 ltc2977:
case ltc2978:
info->read_word_data = ltc2978_read_word_data;
@ -576,6 +659,7 @@ static int ltc2978_probe(struct i2c_client *client,
#ifdef CONFIG_OF
static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltc2974" },
{ .compatible = "lltc,ltc2975" },
{ .compatible = "lltc,ltc2977" },
{ .compatible = "lltc,ltc2978" },
{ .compatible = "lltc,ltc3880" },
@ -601,5 +685,5 @@ static struct i2c_driver ltc2978_driver = {
module_i2c_driver(ltc2978_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");
MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
MODULE_LICENSE("GPL");