/* validate minimum functionality */
if (!(master->touch_bit && master->reset_bus) &&
- !(master->write_bit && master->read_bit)) {
+ !(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);
}