portio_sysfs_entry
static struct portio_sysfs_entry portio_name_attribute =
static struct portio_sysfs_entry portio_start_attribute =
static struct portio_sysfs_entry portio_size_attribute =
static struct portio_sysfs_entry portio_porttype_attribute =
struct portio_sysfs_entry *entry;
entry = container_of(attr, struct portio_sysfs_entry, attr);