Add conversion functions for channel<->frequency

shell/model/devices/network/wireless.py

@@ -20,6 +20,23 @@ import gobject
 from model.devices import device
 from hardware import nmclient
 
+def freq_to_channel(freq):
+        ftoc = { 2.412: 1, 2.417: 2, 2.422: 3, 2.427: 4,
+                  2.432: 5, 2.437: 6, 2.442: 7, 2.447: 8,
+                  2.452: 9, 2.457: 10, 2.462: 11, 2.467: 12,
+                  2.472: 13
+                }
+        return ftoc[freq]
+
+def channel_to_freq(channel):
+        ctof = { 1: 2.412, 2: 2.417, 3: 2.422, 4: 2.427,
+                 5: 2.432, 6: 2.437, 7: 2.442, 8: 2.447,
+                 9: 2.452, 10: 2.457, 11: 2.462, 12: 2.467,
+                 13: 2.472
+               }
+        return ctof[channel]
+
+
 class Device(device.Device):
     __gproperties__ = {
         'name'     : (str, None, None, None,