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#include "linux/module.h"
#include "linux/uaccess.h"
#include "linux/i2c.h"
#include "linux/kobject.h"
#include "linux/slab.h"
#include "linux/kernel.h"
#include <linux/sysfs.h>
#include <linux/hwmon.h>
#include <linux/regmap.h>
// ina260 chip registers
#define INA260_REG_CONFIGURATION 0x00
#define INA260_REG_CURRENT 0x01
#define INA260_REG_VOLTAGE 0x02
#define INA260_REG_POWER 0x03
#define INA260_REG_MASKENABLE 0x06
#define INA260_REG_ALERTLIMIT 0x07
#define INA260_REG_MANUFACTURER 0xFE
#define INA260_REG_DIE 0xFF
#undef current
static struct regmap_config ina260_regmap_config = {
.max_register = 0xFF,
.reg_bits = 8,
.val_bits = 16,
};
#define INA260_REG_SHOW(_attr,_reg) \
static ssize_t _attr##_show(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
unsigned int rvalue; \
int err; \
struct client_data *cdata=dev_get_drvdata(dev); \
err = regmap_read(cdata->regmap, (_reg), &rvalue); \
if(err>0) \
return err; \
return sprintf(buf, "%x\n", rvalue); \
}
#define INA260_REG_STORE(_attr,_reg) \
static ssize_t _attr##_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
{ \
int uvalue, err; \
struct client_data *cdata=dev_get_drvdata(dev); \
if(kstrtoint(buf, 0,&uvalue)) \
return -EINVAL; \
err = regmap_write(cdata->regmap, (_reg), uvalue); \
if(err>0) \
return err; \
return count; \
}
#define HWMON_CHANNEL_INFO(stype, ...) \
(&(struct hwmon_channel_info) { \
.type = hwmon_##stype, \
.config = (u32 []) { \
__VA_ARGS__, 0 \
} \
})
// Data attached to i2c clients
struct client_data {
struct i2c_client *client;
struct regmap *regmap;
};
static const struct i2c_device_id ina260_ids[] = {
{ "ina260", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c,ina260_ids);
static int ina260_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
int rvalue, reg, err;
struct client_data *cdata=dev_get_drvdata(dev);
switch(type){
case hwmon_power:
reg=INA260_REG_POWER;
break;
case hwmon_curr:
reg=INA260_REG_CURRENT;
break;
case hwmon_in:
reg=INA260_REG_VOLTAGE;
break;
default:
return -EOPNOTSUPP;
}
err=regmap_read(cdata->regmap, reg, &rvalue);
if(err<0){
return err;
} else if(type == hwmon_power) {
*val=10*rvalue*1000;
} else{
*val=div_u64(rvalue*25,100)+rvalue;
}
return 0;
}
static int ina260_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
return -EOPNOTSUPP;
}
INA260_REG_SHOW(configuration,INA260_REG_CONFIGURATION)
INA260_REG_SHOW(current,INA260_REG_CURRENT)
INA260_REG_SHOW(bus_voltage,INA260_REG_VOLTAGE)
INA260_REG_SHOW(power,INA260_REG_POWER)
INA260_REG_SHOW(mask_enable,INA260_REG_MASKENABLE)
INA260_REG_SHOW(alert_limit,INA260_REG_ALERTLIMIT)
INA260_REG_SHOW(manufacturer_id,INA260_REG_MANUFACTURER)
INA260_REG_SHOW(die_id,INA260_REG_DIE)
INA260_REG_STORE(configuration,INA260_REG_CONFIGURATION)
INA260_REG_STORE(current,INA260_REG_CURRENT)
INA260_REG_STORE(bus_voltage,INA260_REG_VOLTAGE)
INA260_REG_STORE(power,INA260_REG_POWER)
INA260_REG_STORE(mask_enable,INA260_REG_MASKENABLE)
INA260_REG_STORE(alert_limit,INA260_REG_ALERTLIMIT)
static umode_t ina260_hwmon_is_visible(const void *drvdata,
enum hwmon_sensor_types type,
u32 attr, int channel){
return 0444;
}
static const struct hwmon_channel_info * ina260_hwmon_info[] = {
HWMON_CHANNEL_INFO(in,HWMON_I_INPUT),
HWMON_CHANNEL_INFO(power,HWMON_P_INPUT),
HWMON_CHANNEL_INFO(curr,HWMON_C_INPUT),
NULL
};
static const struct hwmon_ops ina260_hwmon_ops = {
.is_visible = ina260_hwmon_is_visible,
.read = ina260_hwmon_read,
.write = ina260_hwmon_write,
};
static const struct hwmon_chip_info ina260_chip_info = {
.ops = &ina260_hwmon_ops,
.info = ina260_hwmon_info,
};
// ----- Registers -----
static DEVICE_ATTR_RW(configuration);
static DEVICE_ATTR_RW(current);
static DEVICE_ATTR_RW(bus_voltage);
static DEVICE_ATTR_RW(power);
static DEVICE_ATTR_RW(mask_enable);
static DEVICE_ATTR_RW(alert_limit);
static DEVICE_ATTR_RO(manufacturer_id);
static DEVICE_ATTR_RO(die_id);
static struct attribute *registers_attrs[] = {
&dev_attr_configuration.attr,
&dev_attr_current.attr,
&dev_attr_bus_voltage.attr,
&dev_attr_power.attr,
&dev_attr_mask_enable.attr,
&dev_attr_alert_limit.attr,
&dev_attr_manufacturer_id.attr,
&dev_attr_die_id.attr,
NULL,
};
static const struct attribute_group registers_group = {
.attrs = registers_attrs,
.name = "registers"
};
const struct attribute_group *extra_groups[] = {
®isters_group,
NULL
};
static int ina260_probe_new(struct i2c_client *client){
struct client_data *p;
struct device *hwmon_dev;
// Initialize client data:
printk("Adding ina260 [bus=%d address=0x%02x]\n",client->adapter->nr,client->addr);
p=kzalloc(sizeof(struct client_data),GFP_KERNEL);
p->client=client;
p->regmap = devm_regmap_init_i2c(client, &ina260_regmap_config);
hwmon_dev=hwmon_device_register_with_info(&client->dev,client->name,p,
&ina260_chip_info,extra_groups);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
return 0;
}
static int ina260_remove(struct i2c_client *client){
struct client_data *p=i2c_get_clientdata(client);
kfree(p);
hwmon_device_unregister(&client->dev);
printk("Removing ina260 [bus=%d address=0x%02x]\n",client->adapter->nr,client->addr);
return 0;
}
static struct i2c_driver ina260_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ina260"
},
.probe_new = ina260_probe_new,
.remove = ina260_remove,
.id_table = ina260_ids
};
static int __init ina260_init(void){
i2c_add_driver(&ina260_driver);
return 0;
}
static void __exit ina260_exit(void){
i2c_del_driver(&ina260_driver);
}
module_init(ina260_init);
module_exit(ina260_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Loïc Guegan");
MODULE_DESCRIPTION("INA260 Texas Instruments");
MODULE_VERSION("1.0");
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