get_valid_routes
data[1] = dev->get_valid_routes(dev, data[1], data + 2);
ret = get_valid_routes(dev, data);
if (!dev->get_valid_routes)
dev->get_valid_routes = get_zero_valid_routes;
dev->get_valid_routes = _ni_get_valid_routes;
dev->get_valid_routes = _ni_get_valid_routes;
unsigned int (*get_valid_routes)(struct comedi_device *dev,