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hwmon: (ltc2978) Add support for LTC2975

Browse source 
LTC2975 is mostly compatible to LTC2974, but supports input current
and power measurement.

Tested-by: Michael Jones <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Guenter Roeck 2015-06-08 09:56:20 -07:00
commit 649ca820da
4 changed files with 125 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

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");