From d98f612c4152ce2a20557b8968508ea84c94c5bb Mon Sep 17 00:00:00 2001 From: Loic Guegan Date: Thu, 24 Aug 2023 12:57:42 +0200 Subject: Update --- .gitignore | 2 +- ina260_hwmon.c | 261 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 262 insertions(+), 1 deletion(-) create mode 100755 ina260_hwmon.c diff --git a/.gitignore b/.gitignore index 1cf2624..b86483e 100755 --- a/.gitignore +++ b/.gitignore @@ -5,5 +5,5 @@ !Makefile !.gitignore !ina260.c -!ina260_full.c +!ina260_hwmon.c !README.md \ No newline at end of file diff --git a/ina260_hwmon.c b/ina260_hwmon.c new file mode 100755 index 0000000..67ad1e7 --- /dev/null +++ b/ina260_hwmon.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Texas Instruments INA260 power monitor chip + * Datasheet: https://www.ti.com/lit/gpn/INA260 + * + * Copyright (C) 2023 GUEGAN Loic + */ + +#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 +#include +#include + +// INA260 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 + +static struct regmap_config ina260_regmap_config = { + .max_register = INA260_REG_DIE, + .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; \ +} + +/** + * @brief This macro is not available on old kernel especially the one + * used by Beaglebones Single Board Computers + */ +#define HWMON_CHANNEL_INFO(stype, ...) \ + (&(struct hwmon_channel_info) { \ + .type = hwmon_##stype, \ + .config = (u32 []) { \ + __VA_ARGS__, 0 \ + } \ + }) + +/** + * @brief Embedded user data + */ +struct client_data { + struct i2c_client *client; + struct regmap *regmap; +}; + +static int ina260_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + int rvalue, reg, err, rem; + 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_rem(rvalue*25,100,&rem)+rvalue+div_u64(rem,10); + } + 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(curr,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(curr,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){ + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_input: + return 0444; + default: + return 0; + } + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + return 0444; + default: + return 0; + } + case hwmon_power: + switch (attr) { + case hwmon_power_input: + return 0444; + default: + return 0; + } + default: + return 0; + } +} +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(curr); +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_curr.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 const struct i2c_device_id ina260_ids[] = { + { "ina260", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c,ina260_ids); + +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"); -- cgit v1.2.3