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/*
* INA3221 Triple Current/Voltage Monitor
*
* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
* Andrew F. Davis <afd@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#define INA3221_DRIVER_NAME "ina3221"
#define INA3221_CONFIG 0x00
#define INA3221_SHUNT1 0x01
#define INA3221_BUS1 0x02
#define INA3221_SHUNT2 0x03
#define INA3221_BUS2 0x04
#define INA3221_SHUNT3 0x05
#define INA3221_BUS3 0x06
#define INA3221_CRIT1 0x07
#define INA3221_WARN1 0x08
#define INA3221_CRIT2 0x09
#define INA3221_WARN2 0x0a
#define INA3221_CRIT3 0x0b
#define INA3221_WARN3 0x0c
#define INA3221_MASK_ENABLE 0x0f
#define INA3221_CONFIG_MODE_SHUNT BIT(1)
#define INA3221_CONFIG_MODE_BUS BIT(2)
#define INA3221_CONFIG_MODE_CONTINUOUS BIT(3)
#define INA3221_RSHUNT_DEFAULT 10000
enum ina3221_fields {
/* Configuration */
F_RST,
/* Alert Flags */
F_WF3, F_WF2, F_WF1,
F_CF3, F_CF2, F_CF1,
/* sentinel */
F_MAX_FIELDS
};
static const struct reg_field ina3221_reg_fields[] = {
[F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
[F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
[F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
[F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
};
enum ina3221_channels {
INA3221_CHANNEL1,
INA3221_CHANNEL2,
INA3221_CHANNEL3,
INA3221_NUM_CHANNELS
};
static const unsigned int register_channel[] = {
[INA3221_SHUNT1] = INA3221_CHANNEL1,
[INA3221_SHUNT2] = INA3221_CHANNEL2,
[INA3221_SHUNT3] = INA3221_CHANNEL3,
[INA3221_CRIT1] = INA3221_CHANNEL1,
[INA3221_CRIT2] = INA3221_CHANNEL2,
[INA3221_CRIT3] = INA3221_CHANNEL3,
[INA3221_WARN1] = INA3221_CHANNEL1,
[INA3221_WARN2] = INA3221_CHANNEL2,
[INA3221_WARN3] = INA3221_CHANNEL3,
};
/**
* struct ina3221_data - device specific information
* @regmap: Register map of the device
* @fields: Register fields of the device
* @shunt_resistors: Array of resistor values per channel
*/
struct ina3221_data {
struct regmap *regmap;
struct regmap_field *fields[F_MAX_FIELDS];
int shunt_resistors[INA3221_NUM_CHANNELS];
};
static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(ina->regmap, reg, ®val);
if (ret)
return ret;
*val = sign_extend32(regval >> 3, 12);
return 0;
}
static ssize_t ina3221_show_bus_voltage(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int reg = sd_attr->index;
int val, voltage_mv, ret;
ret = ina3221_read_value(ina, reg, &val);
if (ret)
return ret;
voltage_mv = val * 8;
return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv);
}
static ssize_t ina3221_show_shunt_voltage(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int reg = sd_attr->index;
int val, voltage_uv, ret;
ret = ina3221_read_value(ina, reg, &val);
if (ret)
return ret;
voltage_uv = val * 40;
return snprintf(buf, PAGE_SIZE, "%d\n", voltage_uv);
}
static ssize_t ina3221_show_current(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int reg = sd_attr->index;
unsigned int channel = register_channel[reg];
int resistance_uo = ina->shunt_resistors[channel];
int val, current_ma, voltage_nv, ret;
ret = ina3221_read_value(ina, reg, &val);
if (ret)
return ret;
voltage_nv = val * 40000;
current_ma = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
return snprintf(buf, PAGE_SIZE, "%d\n", current_ma);
}
static ssize_t ina3221_set_current(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int reg = sd_attr->index;
unsigned int channel = register_channel[reg];
int resistance_uo = ina->shunt_resistors[channel];
int val, current_ma, voltage_uv, ret;
ret = kstrtoint(buf, 0, ¤t_ma);
if (ret)
return ret;
/* clamp current */
current_ma = clamp_val(current_ma,
INT_MIN / resistance_uo,
INT_MAX / resistance_uo);
voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000);
/* clamp voltage */
voltage_uv = clamp_val(voltage_uv, -163800, 163800);
/* 1 / 40uV(scale) << 3(register shift) = 5 */
val = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
ret = regmap_write(ina->regmap, reg, val);
if (ret)
return ret;
return count;
}
static ssize_t ina3221_show_shunt(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
unsigned int resistance_uo;
resistance_uo = ina->shunt_resistors[channel];
return snprintf(buf, PAGE_SIZE, "%d\n", resistance_uo);
}
static ssize_t ina3221_set_shunt(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
int val;
int ret;
ret = kstrtoint(buf, 0, &val);
if (ret)
return ret;
val = clamp_val(val, 1, INT_MAX);
ina->shunt_resistors[channel] = val;
return count;
}
static ssize_t ina3221_show_alert(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int field = sd_attr->index;
unsigned int regval;
int ret;
ret =
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