;  struct synaptics_rmi0_fn *fhandler;  struct synaptics_rmi0_data *rmi0_data = dev_get_drvdata(dev);  struct synaptics_rmi0_device_info *rmi;   rmi = &(rmi0_data->rmi0_mod_info);   if (sscanf(buf, "%u", &input) != 0)   return -EINVAL;   