util/agents/usb_hid_relay: add support for the LCTech USB HID relay

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>

Author: jluebbe

doc/configuration.rst

@@ -480,7 +480,7 @@ HIDRelay
 ++++++++
 An :any:`HIDRelay` resource describes a single output of an HID protocol based
 USB relays.
-It currently supports the widely used *dcttech USBRelay*.
+It currently supports the widely used *dcttech USBRelay* and *lctech LCUS*
 
 .. code-block:: yaml
 

labgrid/resource/udev.py

@@ -675,6 +675,7 @@ def filter_match(self, device):
         match = (device.properties.get('ID_VENDOR_ID'), device.properties.get('ID_MODEL_ID'))
 
         if match not in [("16c0", "05df"),  # dcttech USBRelay2
+                         ("5131", "2007"),  # LC-US8
                          ]:
             return False
 

labgrid/util/agents/usb_hid_relay.py

@@ -28,6 +28,9 @@ def __init__(self, **args):
         if self._dev.idVendor == 0x16C0:
             self.set_output = self.set_output_dcttech
             self.get_output = self.get_output_dcttech
+        elif self._dev.idVendor == 0x5131:
+            self.set_output = self.set_output_lcus
+            self.get_output = self.get_output_lcus
         else:
             raise ValueError(f"Unknown vendor/protocol for VID {self._dev.idVendor:x}")
 
@@ -56,6 +59,20 @@ def get_output_dcttech(self, number):
         )
         return bool(resp[7] & (1 << (number - 1)))
 
+    def set_output_lcus(self, number, status):
+        assert 1 <= number <= 8
+        ep_in = self._dev[0][(0, 0)][0]
+        ep_out = self._dev[0][(0, 0)][1]
+        req = [0xA0, number, 0x01 if status else 0x00, 0x00]
+        req[3] = sum(req) & 0xFF
+        ep_out.write(req)
+        ep_in.read(64)
+
+    def get_output_lcus(self, number):
+        assert 1 <= number <= 8
+        # we have no information on how to read the current value
+        return False
+
     def __del__(self):
         usb.util.release_interface(self._dev, 0)