feat: Add method for opening devices

device.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+var devices map[string]io.ReadWriteCloser
+
+func GetDevice(name string) (io.ReadWriteCloser, error) {
+	if dev, ok := devices[name]; ok {
+		return dev, nil
+	}
+
+	dev, err := os.OpenFile("/dev/" + name, os.O_RDWR, 0644)
+	if err != nil {
+		return nil, fmt.Errorf("open: %w", err)
+	}
+
+	devices[name] = dev
+	return dev, nil
+}