Add GPIO plugin (#25806)

plugin/gpio_linux.go

@@ -0,0 +1,63 @@
+//go:build linux
+
+package plugin
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/evcc-io/evcc/util"
+	"github.com/stianeikeland/go-rpio/v4"
+)
+
+func init() {
+	registry.AddCtx("gpio", NewGpioPluginFromConfig)
+}
+
+type gpio struct {
+	mu  sync.Mutex
+	pin rpio.Pin
+}
+
+// NewGpioPluginFromConfig creates a GPIO provider
+func NewGpioPluginFromConfig(ctx context.Context, other map[string]any) (Plugin, error) {
+	var cc struct {
+		Pin int
+	}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	p := &gpio{
+		pin: rpio.Pin(cc.Pin),
+	}
+
+	// initialize GPIO and set pins to input
+	if err := rpio.Open(); err != nil {
+		return nil, fmt.Errorf("failed to open GPIO: %w", err)
+	}
+	defer rpio.Close()
+
+	p.pin.Input()
+
+	return p, nil
+}
+
+var _ BoolGetter = (*gpio)(nil)
+
+// BoolGetter returns GPIO pin active
+func (p *gpio) BoolGetter() (func() (bool, error), error) {
+	return func() (bool, error) {
+		p.mu.Lock()
+		defer p.mu.Unlock()
+
+		if err := rpio.Open(); err != nil {
+			return false, fmt.Errorf("failed to open GPIO: %w", err)
+		}
+		defer rpio.Close()
+
+		return p.pin.Read() != rpio.Low, nil
+	}, nil
+}