+function usbport.valuelist(self, section)
+ local port, ports = nil, {}
+ for port in util.imatch(m.uci:get("system", section, "port")) do
+ local b, n = port:match("^usb(%d+)-port(%d+)$")
+ if not (b and n) then
+ b, n = port:match("^(%d+)-(%d+)$")
+ end
+ if b and n then
+ ports[#ports+1] = "usb%u-port%u" %{ tonumber(b), tonumber(n) }
+ end
+ end
+ return ports
+end
+
+function usbport.validate(self, value)
+ return type(value) == "string" and { value } or value
+end
+
+