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hwmon: (pmbus/ltc2978) Add support for LTC2974 and LTC3883

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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck
2013-01-27 09:24:28 -08:00
parent 8c770f3a47
commit fd9175d2f6
3 changed files with 214 additions and 65 deletions
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4
drivers/hwmon/pmbus/Kconfig
View File

@@ -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.

149
drivers/hwmon/pmbus/ltc2978.c
View File

@@ -1,7 +1,8 @@
/*
* 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");