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Commit fd9175d2 authored by Guenter Roeck's avatar Guenter Roeck
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hwmon: (pmbus/ltc2978) Add support for LTC2974 and LTC3883 

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 8c770f3a
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Documentation/hwmon/ltc2978
View file @ fd9175d2
......@@ -2,6 +2,10 @@ Kernel driver ltc2978
=====================
Supported chips:
* Linear Technology LTC2974
Prefix: 'ltc2974'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2974
* Linear Technology LTC2978
Prefix: 'ltc2978'
Addresses scanned: -
......@@ -10,6 +14,10 @@ Supported chips:
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>
......@@ -17,9 +25,9 @@ Author: Guenter Roeck <linux@roeck-us.net>
Description
-----------
The LTC2978 is an octal power supply monitor, supervisor, sequencer and
margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
step-down switching regulator controller.
LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
monitor. LTC3880 is a dual output poly-phase step-down DC/DC controller. LTC3883
is a single phase step-down DC/DC controller.
Usage Notes
......@@ -41,60 +49,90 @@ Sysfs attributes
in1_label "vin"
in1_input Measured input voltage.
in1_min Minimum input voltage.
in1_max Maximum input voltage. LTC2978 only.
in1_lcrit Critical minimum input voltage. LTC2978 only.
in1_max Maximum input voltage. LTC2974 and LTC2978 only.
in1_lcrit Critical minimum input voltage. LTC2974 and LTC2978
only.
in1_crit Critical maximum input voltage.
in1_min_alarm Input voltage low alarm.
in1_max_alarm Input voltage high alarm. LTC2978 only.
in1_lcrit_alarm Input voltage critical low alarm. LTC2978 only.
in1_max_alarm Input voltage high alarm. LTC2974 and LTC2978 only.
in1_lcrit_alarm Input voltage critical low alarm. LTC2974 and LTC2978
only.
in1_crit_alarm Input voltage critical high alarm.
in1_lowest Lowest input voltage. LTC2978 only.
in1_lowest Lowest input voltage. LTC2974 and LTC2978 only.
in1_highest Highest input voltage.
in1_reset_history Reset input voltage history.
in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only.
in[2-9]_input Measured output voltage.
in[2-9]_min Minimum output voltage.
in[2-9]_max Maximum output voltage.
in[2-9]_lcrit Critical minimum output voltage.
in[2-9]_crit Critical maximum output voltage.
in[2-9]_min_alarm Output voltage low alarm.
in[2-9]_max_alarm Output voltage high alarm.
in[2-9]_lcrit_alarm Output voltage critical low alarm.
in[2-9]_crit_alarm Output voltage critical high alarm.
in[2-9]_lowest Lowest output voltage. LTC2978 only.
in[2-9]_highest Lowest output voltage.
in[2-9]_reset_history Reset output voltage history.
temp[1-3]_input Measured temperature.
in[N]_label "vout[1-8]".
LTC2974: N=2-5
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 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.
temp[1-3]_min Mimimum temperature. LTC2978 only.
temp[1-3]_max Maximum temperature.
temp[1-3]_lcrit Critical low temperature.
temp[1-3]_crit Critical high temperature.
temp[1-3]_min_alarm Temperature low alarm. LTC2978 only.
temp[1-3]_max_alarm Temperature high alarm.
temp[1-3]_lcrit_alarm Temperature critical low alarm.
temp[1-3]_crit_alarm Temperature critical high alarm.
temp[1-3]_lowest Lowest measured temperature. LTC2978 only.
temp[1-3]_highest Highest measured temperature.
temp[1-3]_reset_history Reset temperature history.
power[1-2]_label "pout[1-2]". LTC3880 only.
power[1-2]_input Measured power.
curr1_label "iin". LTC3880 only.
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 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 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 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
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.
curr[2-3]_label "iout[1-2]". LTC3880 only.
curr[2-3]_input Measured output current.
curr[2-3]_max Maximum output current.
curr[2-3]_crit Critical output current.
curr[2-3]_max_alarm Output current high alarm.
curr[2-3]_crit_alarm Output current critical 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
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.
drivers/hwmon/pmbus/Kconfig
View file @ fd9175d2
......@@ -48,11 +48,11 @@ config SENSORS_LM25066
be called lm25066.
config SENSORS_LTC2978
tristate "Linear Technologies LTC2978 and LTC3880"
tristate "Linear Technologies LTC2974, LTC2978, LTC3880, and LTC3883"
default n
help
If you say yes here you get hardware monitoring support for Linear
Technology LTC2978 and LTC3880.
Technology LTC2974, LTC2978, LTC3880, and LTC3883.
This driver can also be built as a module. If so, the module will
be called ltc2978.
......
drivers/hwmon/pmbus/ltc2978.c
View file @ fd9175d2
/*
* Hardware monitoring driver for LTC2978 and LTC3880
* Hardware monitoring driver for LTC2974, LTC2978, LTC3880, and LTC3883
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013 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
......@@ -26,31 +27,43 @@
#include <linux/i2c.h>
#include "pmbus.h"
enum chips { ltc2978, ltc3880 };
enum chips { ltc2974, ltc2978, ltc3880, ltc3883 };
/* LTC2978 and LTC3880 */
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
#define LTC2978_MFR_VIN_PEAK 0xde
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
#define LTC2978_MFR_SPECIAL_ID 0xe7
/* LTC2978 only */
/* LTC2974 and LTC2978 */
#define LTC2978_MFR_VOUT_MIN 0xfb
#define LTC2978_MFR_VIN_MIN 0xfc
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
/* LTC3880 only */
/* LTC2974 only */
#define LTC2974_MFR_IOUT_PEAK 0xd7
#define LTC2974_MFR_IOUT_MIN 0xd8
/* LTC3880 and LTC3883 */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
/* LTC3883 only */
#define LTC3883_MFR_IIN_PEAK 0xe1
#define LTC2974_ID 0x0212
#define LTC2978_ID_REV1 0x0121
#define LTC2978_ID_REV2 0x0122
#define LTC3880_ID 0x4000
#define LTC3880_ID_MASK 0xff00
#define LTC3883_ID 0x4300
#define LTC3883_ID_MASK 0xff00
#define LTC2974_NUM_PAGES 4
#define LTC2978_NUM_PAGES 8
#define LTC3880_NUM_PAGES 2
#define LTC3883_NUM_PAGES 1
/*
* LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
......@@ -63,9 +76,10 @@ enum chips { ltc2978, ltc3880 };
struct ltc2978_data {
enum chips id;
u16 vin_min, vin_max;
u16 temp_min, temp_max[LTC3880_NUM_PAGES];
u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
u16 iout_max[LTC3880_NUM_PAGES];
u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
u16 iin_max;
u16 temp2_max;
struct pmbus_driver_info info;
};
......@@ -171,9 +185,9 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
LTC2978_MFR_TEMPERATURE_MIN);
if (ret >= 0) {
if (lin11_to_val(ret)
< lin11_to_val(data->temp_min))
data->temp_min = ret;
ret = data->temp_min;
< lin11_to_val(data->temp_min[page]))
data->temp_min[page] = ret;
ret = data->temp_min[page];
}
break;
case PMBUS_VIRT_READ_IOUT_MAX:
......@@ -189,6 +203,41 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
return ret;
}
static int ltc2974_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_IOUT_MAX:
ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_PEAK);
if (ret >= 0) {
if (lin11_to_val(ret)
> lin11_to_val(data->iout_max[page]))
data->iout_max[page] = ret;
ret = data->iout_max[page];
}
break;
case PMBUS_VIRT_READ_IOUT_MIN:
ret = pmbus_read_word_data(client, page, LTC2974_MFR_IOUT_MIN);
if (ret >= 0) {
if (lin11_to_val(ret)
< lin11_to_val(data->iout_min[page]))
data->iout_min[page] = ret;
ret = data->iout_min[page];
}
break;
case PMBUS_VIRT_RESET_IOUT_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);
......@@ -230,15 +279,41 @@ static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
return ret;
}
static int ltc3883_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, LTC3883_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_RESET_IIN_HISTORY:
ret = 0;
break;
default:
ret = ltc3880_read_word_data(client, page, reg);
break;
}
return ret;
}
static int ltc2978_clear_peaks(struct i2c_client *client, int page,
enum chips id)
{
int ret;
if (id == ltc2978)
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
else
if (id == ltc3880 || id == ltc3883)
ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
else
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
return ret;
}
......@@ -251,8 +326,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
int ret;
switch (reg) {
case PMBUS_VIRT_RESET_IIN_HISTORY:
data->iin_max = 0x7c00;
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
data->iout_max[page] = 0x7c00;
data->iout_min[page] = 0xfbff;
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
......@@ -270,7 +350,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_TEMP_HISTORY:
data->temp_min = 0x7bff;
data->temp_min[page] = 0x7bff;
data->temp_max[page] = 0x7c00;
ret = ltc2978_clear_peaks(client, page, data->id);
break;
......@@ -282,8 +362,10 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
}
static const struct i2c_device_id ltc2978_id[] = {
{"ltc2974", ltc2974},
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
{"ltc3883", ltc3883},
{}
};
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
......@@ -308,10 +390,14 @@ static int ltc2978_probe(struct i2c_client *client,
if (chip_id < 0)
return chip_id;
if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
if (chip_id == LTC2974_ID) {
data->id = ltc2974;
} else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
data->id = ltc2978;
} 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");
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