feat(ezcoo): serial driver for EZCOO HDMI matrix

pkg/ezcoo/ports.go

@@ -0,0 +1,20 @@
+package ezcoo
+
+import (
+	"fmt"
+	"time"
+
+	"go.bug.st/serial"
+)
+
+func Open(cfg Config) (serial.Port, error) {
+	mode := &serial.Mode{BaudRate: cfg.Baud}
+	p, err := serial.Open(cfg.Port, mode)
+	if err != nil {
+		return nil, fmt.Errorf("open serial %s: %w", cfg.Port, err)
+	}
+
+	// Give the device time to initialise after USB-serial reset.
+	time.Sleep(500 * time.Millisecond)
+	return p, nil
+}