Add Linux gpiod plugin

core/src/drivers/plugins/native/gpiod/Makefile

@@ -0,0 +1,28 @@
+# Makefile for test plugin
+
+CC = gcc
+CFLAGS = -fPIC -I../../../../lib -I../../../../drivers -I..
+LDFLAGS = -shared -lpthread -lgpiod
+
+TARGET = gpiod_plugin.so
+SOURCE = gpiod_plugin.c
+PLUGIN_LOGGER = ../plugin_logger.c
+
+LOADER_TARGET = test_plugin_loader
+LOADER_SOURCE = test_plugin_loader.c
+
+all: $(TARGET) $(LOADER_TARGET)
+
+$(TARGET): $(SOURCE) $(PLUGIN_LOGGER)
+	$(CC) $(CFLAGS) $(SOURCE) $(PLUGIN_LOGGER) $(LDFLAGS) -o $(TARGET)
+
+$(LOADER_TARGET): $(LOADER_SOURCE)
+	$(CC) -o $(LOADER_TARGET) $(LOADER_SOURCE) -ldl -lpthread -lgpiod
+
+test: $(TARGET) $(LOADER_TARGET)
+	./$(LOADER_TARGET)
+
+clean:
+	rm -f $(TARGET) $(LOADER_TARGET)
+
+.PHONY: all clean test

core/src/drivers/plugins/native/gpiod/README.md

@@ -0,0 +1,140 @@
+# GPIOD Plugin for OpenPLC
+
+A native plugin for OpenPLC that provides GPIO (General Purpose Input/Output) support using the `libgpiod` library.
+It can be used on any Linux device with GPIOs, not only on RaspberryPi, even on PC with USB-GPIO devices
+
+## Dependencies
+
+### Required Packages
+To compile this plugin, you must have the `libgpiod-dev` package installed:
+
+```bash
+# On Debian/Ubuntu
+sudo apt-get install libgpiod-dev
+
+# On Fedora/RHEL
+sudo dnf install libgpiod-devel
+```
+
+## Building
+
+```bash
+make
+```
+
+## Configuration
+
+The plugin requires a CSV configuration file that maps IEC addresses to GPIO lines. The file path is specified in the OpenPLC plugin configuration.
+
+### CSV File Format
+
+The CSV file contains three columns: `IEC_ADDRESS`, `CHIP_NAME`, `LINE_IDENTIFIER`
+
+**Header (required):**
+```
+IEC_ADDRESS,CHIP_NAME,LINE_IDENTIFIER
+```
+
+**Field Descriptions:**
+- **IEC_ADDRESS**: IEC 61131-3 format address
+  - Input format: `%IX<byte>.<bit>` (e.g., `%IX0.0`)
+  - Output format: `%QX<byte>.<bit>` (e.g., `%QX0.1`)
+  - `<byte>`: Buffer index (0-1023)
+  - `<bit>`: Bit position within byte (0-7)
+
+- **CHIP_NAME**: GPIO chip device path
+  - Typically `/dev/gpiochip0`, `/dev/gpiochip1`, etc.
+  - Found in `/dev/*` directory
+
+- **LINE_IDENTIFIER**: GPIO line reference
+  - Can be a numeric offset (e.g., `0`, `5`, `17`)
+  - Or a named line (e.g., `LED_STATUS`, `BUTTON_RESET`)
+  - Named lines are resolved via the chip's line names information
+
+### Example I/O mapping CSV File
+
+**File: io-map.csv**
+
+```csv
+IEC_ADDRESS,CHIP_NAME,LINE_IDENTIFIER
+%IX0.2,/dev/gpiochip0,GPIO2
+%IX0.3,/dev/gpiochip0,GPIO3
+%IX0.4,/dev/gpiochip0,GPIO4
+%IX0.3,/dev/gpiochip0,GPIO5
+%QX0.0,/dev/gpiochip0,GPIO10
+%QX0.1,/dev/gpiochip0,GPIO11
+%QX0.2,/dev/gpiochip0,GPIO12
+%QX0.3,/dev/gpiochip0,GPIO13
+```
+
+### Plugin Configuration
+
+Add following line to **plugins.conf**
+```csv
+gpiod,./core/src/drivers/plugins/native/gpiod/gpiod_plugin.so,1,1,./config/io-map.csv
+```
+
+### Running plugin
+
+When OpenPLC runtime is running mapped GPIO lines are controlled by OpenPLC, and consumer names are set
+according given map configuration.
+
+Here is an example for raspberrypi:
+```bash
+pi@raspberrypi:~ $ gpioinfo 
+gpiochip0 - 54 lines:
+	line   0:	"ID_SDA"        	input
+	line   1:	"ID_SCL"        	input
+	line   2:	"GPIO2"         	input consumer="OpenPLC-%IX0.2"
+	line   3:	"GPIO3"         	input consumer="OpenPLC-%IX0.3"
+	line   4:	"GPIO4"         	input consumer="OpenPLC-%IX0.4"
+	line   5:	"GPIO5"         	input consumer="OpenPLC-%IX0.3"
+	line   6:	"GPIO6"         	input
+	line   7:	"GPIO7"         	input
+	line   8:	"GPIO8"         	input
+	line   9:	"GPIO9"         	input
+	line  10:	"GPIO10"        	output consumer="OpenPLC-%QX0.0"
+	line  11:	"GPIO11"        	output consumer="OpenPLC-%QX0.1"
+	line  12:	"GPIO12"        	output consumer="OpenPLC-%QX0.2"
+	line  13:	"GPIO13"        	output consumer="OpenPLC-%QX0.3"
+	line  14:	"GPIO14"        	input
+	line  15:	"GPIO15"        	input
+	line  16:	"GPIO16"        	input
+	line  17:	"GPIO17"        	input
+	line  18:	"GPIO18"        	input
+	line  19:	"GPIO19"        	input
+	line  20:	"GPIO20"        	input
+	line  21:	"GPIO21"        	input
+	line  22:	"GPIO22"        	input
+	line  23:	"GPIO23"        	input
+	line  24:	"GPIO24"        	input
+	line  25:	"GPIO25"        	input
+	line  26:	"GPIO26"        	input
+	line  27:	"GPIO27"        	input
+	line  28:	"SDA0"          	input
+	line  29:	"SCL0"          	input
+	line  30:	"NC"            	input
+	line  31:	"LAN_RUN"       	output
+	line  32:	"CAM_GPIO1"     	output
+	line  33:	"NC"            	input
+	line  34:	"NC"            	input
+	line  35:	"PWR_LOW_N"     	input consumer="PWR"
+	line  36:	"NC"            	input
+	line  37:	"NC"            	input
+	line  38:	"USB_LIMIT"     	output
+	line  39:	"NC"            	input
+	line  40:	"PWM0_OUT"      	input
+	line  41:	"CAM_GPIO0"     	output consumer="cam1_regulator"
+	line  42:	"NC"            	input
+	line  43:	"NC"            	input
+	line  44:	"ETH_CLK"       	input
+	line  45:	"PWM1_OUT"      	input
+	line  46:	"HDMI_HPD_N"    	input active-low consumer="hpd"
+	line  47:	"STATUS_LED"    	output consumer="ACT"
+	line  48:	"SD_CLK_R"      	input
+	line  49:	"SD_CMD_R"      	input
+	line  50:	"SD_DATA0_R"    	input
+	line  51:	"SD_DATA1_R"    	input
+	line  52:	"SD_DATA2_R"    	input
+	line  53:	"SD_DATA3_R"    	input
+```