[Edgecore][AS7816-64X] Read the data when the PSU is in the power-good state.

platform/broadcom/sonic-platform-modules-accton/as7816-64x/sonic_platform/psu.py

@@ -45,3 +45,68 @@ class Psu(PddfPsu):
                 pass
 
         return threshold
+
+    def get_model(self):
+        """
+        Retrieves the model number (or part number) of the device
+
+        Returns:
+            string: Model/part number of device
+        """
+        model = super().get_model()
+        if model and model.strip() == "":
+            return None
+
+        return model
+
+    def get_serial(self):
+        """
+        Retrieves the serial number of the device
+
+        Returns:
+            string: Serial number of device
+        """
+        serial = super().get_serial()
+        if serial and serial.strip() == "":
+            return None
+
+        return serial
+
+    def get_voltage(self):
+        """
+        Retrieves current PSU voltage output
+
+        Returns:
+            A float number, the output voltage in volts,
+            e.g. 12.1
+        """
+        if self.get_status() is not True:
+            return 0.0
+
+        return super().get_voltage()
+
+    def get_current(self):
+        """
+        Retrieves present electric current supplied by PSU
+
+        Returns:
+            A float number, electric current in amperes,
+            e.g. 15.4
+        """
+        if self.get_status() is not True:
+            return 0.0
+
+        return super().get_current()
+
+    def get_power(self):
+        """
+        Retrieves current energy supplied by PSU
+
+        Returns:
+            A float number, the power in watts,
+            e.g. 302.6
+        """
+        if self.get_status() is not True:
+            return 0.0
+
+        return super().get_power()