- dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
+ /* validate minimum functionality */
+ if (!(master->touch_bit && master->reset_bus) &&
+ !(master->write_bit && master->read_bit) &&
+ !(master->write_byte && master->read_byte && master->reset_bus)) {
+ printk(KERN_ERR "w1_add_master_device: invalid function set\n");
+ return(-EINVAL);
+ }
+
+ dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device);