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2 changed files with 262 additions and 1 deletions
2
.gitignore
vendored
2
.gitignore
vendored
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@ -5,5 +5,5 @@
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!Makefile
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!.gitignore
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!ina260.c
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!ina260_full.c
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!ina260_hwmon.c
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!README.md
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261
ina260_hwmon.c
Executable file
261
ina260_hwmon.c
Executable file
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for Texas Instruments INA260 power monitor chip
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* Datasheet: https://www.ti.com/lit/gpn/INA260
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*
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* Copyright (C) 2023 GUEGAN Loic <loic.guegan@mailbox.org>
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*/
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#include "linux/module.h"
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#include "linux/uaccess.h"
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#include "linux/i2c.h"
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#include "linux/kobject.h"
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#include "linux/slab.h"
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#include "linux/kernel.h"
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#include <linux/sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/regmap.h>
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// INA260 registers
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#define INA260_REG_CONFIGURATION 0x00
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#define INA260_REG_CURRENT 0x01
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#define INA260_REG_VOLTAGE 0x02
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#define INA260_REG_POWER 0x03
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#define INA260_REG_MASKENABLE 0x06
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#define INA260_REG_ALERTLIMIT 0x07
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#define INA260_REG_MANUFACTURER 0xFE
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#define INA260_REG_DIE 0xFF
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static struct regmap_config ina260_regmap_config = {
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.max_register = INA260_REG_DIE,
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.reg_bits = 8,
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.val_bits = 16,
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};
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#define INA260_REG_SHOW(_attr,_reg) \
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static ssize_t _attr##_show(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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unsigned int rvalue; \
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int err; \
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struct client_data *cdata=dev_get_drvdata(dev); \
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err = regmap_read(cdata->regmap, (_reg), &rvalue); \
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if(err>0) \
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return err; \
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return sprintf(buf, "%x\n", rvalue); \
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}
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#define INA260_REG_STORE(_attr,_reg) \
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static ssize_t _attr##_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
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{ \
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int uvalue, err; \
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struct client_data *cdata=dev_get_drvdata(dev); \
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if(kstrtoint(buf, 0,&uvalue)) \
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return -EINVAL; \
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err = regmap_write(cdata->regmap, (_reg), uvalue); \
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if(err>0) \
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return err; \
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return count; \
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}
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/**
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* @brief This macro is not available on old kernel especially the one
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* used by Beaglebones Single Board Computers
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*/
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#define HWMON_CHANNEL_INFO(stype, ...) \
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(&(struct hwmon_channel_info) { \
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.type = hwmon_##stype, \
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.config = (u32 []) { \
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__VA_ARGS__, 0 \
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} \
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})
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/**
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* @brief Embedded user data
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*/
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struct client_data {
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struct i2c_client *client;
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struct regmap *regmap;
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};
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static int ina260_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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int rvalue, reg, err, rem;
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struct client_data *cdata=dev_get_drvdata(dev);
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switch(type){
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case hwmon_power:
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reg=INA260_REG_POWER;
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break;
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case hwmon_curr:
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reg=INA260_REG_CURRENT;
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break;
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case hwmon_in:
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reg=INA260_REG_VOLTAGE;
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break;
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default:
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return -EOPNOTSUPP;
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}
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err=regmap_read(cdata->regmap, reg, &rvalue);
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if(err<0){
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return err;
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} else if(type == hwmon_power) {
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*val=10*rvalue*1000;
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} else{
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*val=div_u64_rem(rvalue*25,100,&rem)+rvalue+div_u64(rem,10);
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}
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return 0;
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}
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static int ina260_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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return -EOPNOTSUPP;
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}
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INA260_REG_SHOW(configuration,INA260_REG_CONFIGURATION)
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INA260_REG_SHOW(curr,INA260_REG_CURRENT)
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INA260_REG_SHOW(bus_voltage,INA260_REG_VOLTAGE)
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INA260_REG_SHOW(power,INA260_REG_POWER)
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INA260_REG_SHOW(mask_enable,INA260_REG_MASKENABLE)
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INA260_REG_SHOW(alert_limit,INA260_REG_ALERTLIMIT)
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INA260_REG_SHOW(manufacturer_id,INA260_REG_MANUFACTURER)
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INA260_REG_SHOW(die_id,INA260_REG_DIE)
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INA260_REG_STORE(configuration,INA260_REG_CONFIGURATION)
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INA260_REG_STORE(curr,INA260_REG_CURRENT)
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INA260_REG_STORE(bus_voltage,INA260_REG_VOLTAGE)
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INA260_REG_STORE(power,INA260_REG_POWER)
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INA260_REG_STORE(mask_enable,INA260_REG_MASKENABLE)
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INA260_REG_STORE(alert_limit,INA260_REG_ALERTLIMIT)
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static umode_t ina260_hwmon_is_visible(const void *drvdata,
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enum hwmon_sensor_types type,
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u32 attr, int channel){
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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return 0444;
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default:
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return 0;
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}
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case hwmon_curr:
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switch (attr) {
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case hwmon_curr_input:
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return 0444;
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default:
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return 0;
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}
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case hwmon_power:
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switch (attr) {
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case hwmon_power_input:
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return 0444;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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static const struct hwmon_channel_info * ina260_hwmon_info[] = {
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HWMON_CHANNEL_INFO(in,HWMON_I_INPUT),
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HWMON_CHANNEL_INFO(power,HWMON_P_INPUT),
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HWMON_CHANNEL_INFO(curr,HWMON_C_INPUT),
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NULL
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};
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static const struct hwmon_ops ina260_hwmon_ops = {
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.is_visible = ina260_hwmon_is_visible,
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.read = ina260_hwmon_read,
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.write = ina260_hwmon_write,
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};
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static const struct hwmon_chip_info ina260_chip_info = {
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.ops = &ina260_hwmon_ops,
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.info = ina260_hwmon_info,
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};
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// ----- Registers -----
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static DEVICE_ATTR_RW(configuration);
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static DEVICE_ATTR_RW(curr);
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static DEVICE_ATTR_RW(bus_voltage);
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static DEVICE_ATTR_RW(power);
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static DEVICE_ATTR_RW(mask_enable);
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static DEVICE_ATTR_RW(alert_limit);
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static DEVICE_ATTR_RO(manufacturer_id);
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static DEVICE_ATTR_RO(die_id);
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static struct attribute *registers_attrs[] = {
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&dev_attr_configuration.attr,
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&dev_attr_curr.attr,
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&dev_attr_bus_voltage.attr,
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&dev_attr_power.attr,
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&dev_attr_mask_enable.attr,
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&dev_attr_alert_limit.attr,
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&dev_attr_manufacturer_id.attr,
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&dev_attr_die_id.attr,
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NULL,
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};
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static const struct attribute_group registers_group = {
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.attrs = registers_attrs,
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.name = "registers"
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};
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const struct attribute_group *extra_groups[] = {
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®isters_group,
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NULL
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};
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static int ina260_probe_new(struct i2c_client *client){
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struct client_data *p;
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struct device *hwmon_dev;
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// Initialize client data:
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printk("Adding ina260 [bus=%d address=0x%02x]\n",client->adapter->nr,client->addr);
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p=kzalloc(sizeof(struct client_data),GFP_KERNEL);
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p->client=client;
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p->regmap = devm_regmap_init_i2c(client, &ina260_regmap_config);
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hwmon_dev=hwmon_device_register_with_info(&client->dev,client->name,p,
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&ina260_chip_info,extra_groups);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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return 0;
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}
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static int ina260_remove(struct i2c_client *client){
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struct client_data *p=i2c_get_clientdata(client);
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kfree(p);
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hwmon_device_unregister(&client->dev);
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printk("Removing ina260 [bus=%d address=0x%02x]\n",client->adapter->nr,client->addr);
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return 0;
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}
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static const struct i2c_device_id ina260_ids[] = {
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{ "ina260", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c,ina260_ids);
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static struct i2c_driver ina260_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "ina260"
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},
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.probe_new = ina260_probe_new,
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.remove = ina260_remove,
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.id_table = ina260_ids
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};
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static int __init ina260_init(void){
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i2c_add_driver(&ina260_driver);
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return 0;
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}
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static void __exit ina260_exit(void){
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i2c_del_driver(&ina260_driver);
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}
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module_init(ina260_init);
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module_exit(ina260_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Loïc Guegan");
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MODULE_DESCRIPTION("INA260 Texas Instruments");
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MODULE_VERSION("1.0");
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