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hwmon: (pmbus/adm1275) support PMBUS_VIRT_*_SAMPLES 

The device supports setting the number of samples for averaging the
measurements. There are two separate settings - PWR_AVG for averaging
PIN and VI_AVG for averaging VIN/VAUX/IOUT, both being part of
PMON_CONFIG register. The values are stored as exponent of base 2 of the
actual number of samples that will be taken.

Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
[groeck: Dropped unused variables]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Adamski, Krzysztof (Nokia - PL/Wroclaw) 2019-05-29 14:36:21 +00:00 committed by Guenter Roeck
parent 5696e4aaab
commit c83529c17e
1 changed files with 58 additions and 1 deletions
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59
drivers/hwmon/pmbus/adm1275.c
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@ -14,6 +14,8 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/bitops.h>
#include <linux/bitfield.h>
#include <linux/log2.h>
#include "pmbus.h"
enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
@ -69,6 +71,10 @@ enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
#define ADM1075_VAUX_OV_WARN BIT(7)
#define ADM1075_VAUX_UV_WARN BIT(6)
#define ADM1275_PWR_AVG_MASK GENMASK(13, 11)
#define ADM1275_VI_AVG_MASK GENMASK(10, 8)
#define ADM1275_SAMPLES_AVG_MAX 128
struct adm1275_data {
int id;
bool have_oc_fault;
@ -155,6 +161,32 @@ static const struct coefficients adm1293_coefficients[] = {
[18] = { 7658, 0, -3 }, /* power, 21V, irange200 */
};
static inline int adm1275_read_pmon_config(struct i2c_client *client, u16 mask)
{
int ret;
ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
if (ret < 0)
return ret;
return FIELD_GET(mask, (u16)ret);
}
static inline int adm1275_write_pmon_config(struct i2c_client *client, u16 mask,
u16 word)
{
int ret;
ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
if (ret < 0)
return ret;
word = FIELD_PREP(mask, word) | (ret & ~mask);
ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG, word);
return ret;
}
static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
@ -233,6 +265,19 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
if (!data->have_temp_max)
return -ENXIO;
break;
case PMBUS_VIRT_POWER_SAMPLES:
ret = adm1275_read_pmon_config(client, ADM1275_PWR_AVG_MASK);
if (ret < 0)
break;
ret = BIT(ret);
break;
case PMBUS_VIRT_IN_SAMPLES:
case PMBUS_VIRT_CURR_SAMPLES:
ret = adm1275_read_pmon_config(client, ADM1275_VI_AVG_MASK);
if (ret < 0)
break;
ret = BIT(ret);
break;
default:
ret = -ENODATA;
break;
@ -277,6 +322,17 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
case PMBUS_VIRT_RESET_TEMP_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
break;
case PMBUS_VIRT_POWER_SAMPLES:
word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
ret = adm1275_write_pmon_config(client, ADM1275_PWR_AVG_MASK,
ilog2(word));
break;
case PMBUS_VIRT_IN_SAMPLES:
case PMBUS_VIRT_CURR_SAMPLES:
word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
ret = adm1275_write_pmon_config(client, ADM1275_VI_AVG_MASK,
ilog2(word));
break;
default:
ret = -ENODATA;
break;
@ -430,7 +486,8 @@ static int adm1275_probe(struct i2c_client *client,
info->format[PSC_CURRENT_OUT] = direct;
info->format[PSC_POWER] = direct;
info->format[PSC_TEMPERATURE] = direct;
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_SAMPLES;
info->read_word_data = adm1275_read_word_data;
info->read_byte_data = adm1275_read_byte_data;