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Release 4.10 drivers/hwmon/ina3221.c

Directory: drivers/hwmon
/*
 * 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, &regval); if (ret) return ret; *val = sign_extend32(regval >> 3, 12); return 0; }

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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); }

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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); }

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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); }

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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, &current_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; }

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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); }

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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; }

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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 = regmap_field_read(ina->fields[field], &regval); if (ret) return ret; return snprintf(buf, PAGE_SIZE, "%d\n", regval); }

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/* bus voltage */ static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina3221_show_bus_voltage, NULL, INA3221_BUS1); static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ina3221_show_bus_voltage, NULL, INA3221_BUS2); static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ina3221_show_bus_voltage, NULL, INA3221_BUS3); /* calculated current */ static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina3221_show_current, NULL, INA3221_SHUNT1); static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ina3221_show_current, NULL, INA3221_SHUNT2); static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, ina3221_show_current, NULL, INA3221_SHUNT3); /* shunt resistance */ static SENSOR_DEVICE_ATTR(shunt1_resistor, S_IRUGO | S_IWUSR, ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1); static SENSOR_DEVICE_ATTR(shunt2_resistor, S_IRUGO | S_IWUSR, ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2); static SENSOR_DEVICE_ATTR(shunt3_resistor, S_IRUGO | S_IWUSR, ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3); /* critical current */ static SENSOR_DEVICE_ATTR(curr1_crit, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_CRIT1); static SENSOR_DEVICE_ATTR(curr2_crit, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_CRIT2); static SENSOR_DEVICE_ATTR(curr3_crit, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_CRIT3); /* critical current alert */ static SENSOR_DEVICE_ATTR(curr1_crit_alarm, S_IRUGO, ina3221_show_alert, NULL, F_CF1); static SENSOR_DEVICE_ATTR(curr2_crit_alarm, S_IRUGO, ina3221_show_alert, NULL, F_CF2); static SENSOR_DEVICE_ATTR(curr3_crit_alarm, S_IRUGO, ina3221_show_alert, NULL, F_CF3); /* warning current */ static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_WARN1); static SENSOR_DEVICE_ATTR(curr2_max, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_WARN2); static SENSOR_DEVICE_ATTR(curr3_max, S_IRUGO | S_IWUSR, ina3221_show_current, ina3221_set_current, INA3221_WARN3); /* warning current alert */ static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ina3221_show_alert, NULL, F_WF1); static SENSOR_DEVICE_ATTR(curr2_max_alarm, S_IRUGO, ina3221_show_alert, NULL, F_WF2); static SENSOR_DEVICE_ATTR(curr3_max_alarm, S_IRUGO, ina3221_show_alert, NULL, F_WF3); /* shunt voltage */ static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ina3221_show_shunt_voltage, NULL, INA3221_SHUNT1); static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ina3221_show_shunt_voltage, NULL, INA3221_SHUNT2); static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3); static struct attribute *ina3221_attrs[] = { /* channel 1 */ &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_shunt1_resistor.dev_attr.attr, &sensor_dev_attr_curr1_crit.dev_attr.attr, &sensor_dev_attr_curr1_crit_alarm.dev_attr.attr, &sensor_dev_attr_curr1_max.dev_attr.attr, &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, /* channel 2 */ &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_curr2_input.dev_attr.attr, &sensor_dev_attr_shunt2_resistor.dev_attr.attr, &sensor_dev_attr_curr2_crit.dev_attr.attr, &sensor_dev_attr_curr2_crit_alarm.dev_attr.attr, &sensor_dev_attr_curr2_max.dev_attr.attr, &sensor_dev_attr_curr2_max_alarm.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, /* channel 3 */ &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_curr3_input.dev_attr.attr, &sensor_dev_attr_shunt3_resistor.dev_attr.attr, &sensor_dev_attr_curr3_crit.dev_attr.attr, &sensor_dev_attr_curr3_crit_alarm.dev_attr.attr, &sensor_dev_attr_curr3_max.dev_attr.attr, &sensor_dev_attr_curr3_max_alarm.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(ina3221); static const struct regmap_range ina3221_yes_ranges[] = { regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3), regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE), }; static const struct regmap_access_table ina3221_volatile_table = { .yes_ranges = ina3221_yes_ranges, .n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges), }; static const struct regmap_config ina3221_regmap_config = { .reg_bits = 8, .val_bits = 16, .cache_type = REGCACHE_RBTREE, .volatile_table = &ina3221_volatile_table, };
static int ina3221_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct ina3221_data *ina; struct device *hwmon_dev; int i, ret; ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL); if (!ina) return -ENOMEM; ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config); if (IS_ERR(ina->regmap)) { dev_err(dev, "Unable to allocate register map\n"); return PTR_ERR(ina->regmap); } for (i = 0; i < F_MAX_FIELDS; i++) { ina->fields[i] = devm_regmap_field_alloc(dev, ina->regmap, ina3221_reg_fields[i]); if (IS_ERR(ina->fields[i])) { dev_err(dev, "Unable to allocate regmap fields\n"); return PTR_ERR(ina->fields[i]); } } for (i = 0; i < INA3221_NUM_CHANNELS; i++) ina->shunt_resistors[i] = INA3221_RSHUNT_DEFAULT; ret = regmap_field_write(ina->fields[F_RST], true); if (ret) { dev_err(dev, "Unable to reset device\n"); return ret; } hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, ina, ina3221_groups); if (IS_ERR(hwmon_dev)) { dev_err(dev, "Unable to register hwmon device\n"); return PTR_ERR(hwmon_dev); } return 0; }

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static const struct of_device_id ina3221_of_match_table[] = { { .compatible = "ti,ina3221", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, ina3221_of_match_table); static const struct i2c_device_id ina3221_ids[] = { { "ina3221", 0 }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(i2c, ina3221_ids); static struct i2c_driver ina3221_i2c_driver = { .probe = ina3221_probe, .driver = { .name = INA3221_DRIVER_NAME, .of_match_table = ina3221_of_match_table, }, .id_table = ina3221_ids, }; module_i2c_driver(ina3221_i2c_driver); MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver"); MODULE_LICENSE("GPL v2");

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Directory: drivers/hwmon
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