loic/ina260-sysfs-driver
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Loic Guegan 2023-08-11 12:44:50 +02:00
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README.md
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@ -1,12 +1,23 @@
# INA260-sysfs-driver
Link to the [ina260 datasheet](https://www.ti.com/lit/gpn/INA260).
## Installation
$ make
$ sudo insmod ina260.ko
## Usage
## Managing INA260 devices
- Add device: `echo ina260 [devaddr] > /sys/bus/i2c/devices/<bus>/new_device`
- Delete device: `echo [devaddr] > /sys/bus/i2c/devices/<bus>/delete_device`
- Add device: `echo ina260 <devaddr> > /sys/bus/i2c/devices/<busid>/new_device`
## Sysfs structure
- Overview: `tree /sys/kernel/ina260`
- You can access to each device registers in `/sys/kernel/ina260/<device>/registers/`
- You can access to each device register fields in `/sys/kernel/ina260/<device>/fields/`
- You can access to the currently measured current, voltage and power via `/sys/kernel/ina260/<device>/<power|current|voltage>` (units are watts, amperes and volts respectively)
- Next, run: `tree /sys/kernel/ina260`
For more informations on the registers/fields, please refer to the [ina260 datasheet](https://www.ti.com/lit/gpn/INA260).
## Notes
- Tested so far on a [Beaglebone Black](https://www.beagleboard.org/boards/beaglebone-black) with a [Mikrobus Cape](https://www.mikroe.com/beaglebone-mikrobus-cape) with up to four ina260 devices attached.

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ina260.c
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@ -371,9 +371,9 @@ static const struct attribute_group registers_group = {
};
// ----- Metrics -----
static struct kobj_attribute metric_power_attribute =
__ATTR(power, 0664, attr_metric_show, NULL);
__ATTR(power, 0444, attr_metric_show, NULL);
static struct kobj_attribute metric_voltage_attribute =
__ATTR(voltage, 0664, attr_metric_show, NULL);
__ATTR(voltage, 0444, attr_metric_show, NULL);
static struct kobj_attribute metric_current_attribute = {
.attr = {.name = "current", // current is a defined macro so need to do it manually
.mode = VERIFY_OCTAL_PERMISSIONS(0444) },