client: use digital input protocol for io get

Resolve labgrid-client io get via DigitalInputProtocol when a matching
driver is configured. This allows input-only drivers to use the
existing io command.

Keep the existing NetworkSysfsGPIO fallback on GpioDigitalOutputDriver
so resource-only configurations continue to behave as before.

Co-developed-by: Felix Zwettler <Felix.Zwettler@duagon.com>
Signed-off-by: Felix Zwettler <Felix.Zwettler@duagon.com>
Signed-off-by: Ozan Durgut <ozan.durgut@analog.com>

Author: ozan956

labgrid/remote/client.py

@@ -991,7 +991,10 @@ def digital_io(self):
 
         drv = None
         try:
-            drv = target.get_driver("DigitalOutputProtocol", name=name)
+            if action == "get":
+                drv = target.get_driver("DigitalInputProtocol", name=name)
+            else:
+                drv = target.get_driver("DigitalOutputProtocol", name=name)
         except NoDriverFoundError:
             for resource in target.resources:
                 if name and resource.name != name: