staging/greybus/authentication.c

50 	struct gb_cap *cap = container_of(kref, struct gb_cap, kref);
52 	kfree(cap);
56  * All users of cap take a reference (from within list_mutex lock), before
60 static void put_cap(struct gb_cap *cap)
62 	kref_put(&cap->kref, cap_kref_release);
68 	struct gb_cap *cap;
72 	list_for_each_entry(cap, &cap_list, node) {
73 		if (&cap->cdev == cdev) {
74 			kref_get(&cap->kref);
79 	cap = NULL;
84 	return cap;
87 static int cap_get_endpoint_uid(struct gb_cap *cap, u8 *euid)
89 	struct gb_connection *connection = cap->connection;
96 		dev_err(cap->parent, "failed to get endpoint uid (%d)\n", ret);
105 static int cap_get_ims_certificate(struct gb_cap *cap, u32 class, u32 id,
108 	struct gb_connection *connection = cap->connection;
129 		dev_err(cap->parent, "failed to get certificate (%d)\n", ret);
143 static int cap_authenticate(struct gb_cap *cap, u32 auth_type, u8 *uid,
147 	struct gb_connection *connection = cap->connection;
168 		dev_err(cap->parent, "failed to authenticate (%d)\n", ret);
187 	struct gb_cap *cap = get_cap(inode->i_cdev);
189 	/* cap structure can't get freed until file descriptor is closed */
190 	if (cap) {
191 		file->private_data = cap;
200 	struct gb_cap *cap = file->private_data;
202 	put_cap(cap);
206 static int cap_ioctl(struct gb_cap *cap, unsigned int cmd,
217 		ret = cap_get_endpoint_uid(cap, endpoint_uid.uid);
231 		ret = cap_get_ims_certificate(cap, ims_cert->certificate_class,
247 		ret = cap_authenticate(cap, authenticate->auth_type,
267 	struct gb_cap *cap = file->private_data;
268 	struct gb_bundle *bundle = cap->connection->bundle;
281 	mutex_lock(&cap->mutex);
282 	if (!cap->disabled) {
285 			ret = cap_ioctl(cap, cmd, (void __user *)arg);
289 	mutex_unlock(&cap->mutex);
303 	struct gb_cap *cap;
309 	cap = kzalloc(sizeof(*cap), GFP_KERNEL);
310 	if (!cap)
313 	cap->parent = &connection->bundle->dev;
314 	cap->connection = connection;
315 	mutex_init(&cap->mutex);
316 	gb_connection_set_data(connection, cap);
317 	kref_init(&cap->kref);
320 	list_add(&cap->node, &cap_list);
333 	/* Add a char device to allow userspace to interact with cap */
334 	cap->dev_num = MKDEV(MAJOR(cap_dev_num), minor);
335 	cdev_init(&cap->cdev, &cap_fops);
337 	ret = cdev_add(&cap->cdev, cap->dev_num, 1);
342 	cap->class_device = device_create(&cap_class, cap->parent, cap->dev_num,
344 	if (IS_ERR(cap->class_device)) {
345 		ret = PTR_ERR(cap->class_device);
352 	cdev_del(&cap->cdev);
359 	list_del(&cap->node);
362 	put_cap(cap);
369 	struct gb_cap *cap;
374 	cap = gb_connection_get_data(connection);
376 	device_destroy(&cap_class, cap->dev_num);
377 	cdev_del(&cap->cdev);
378 	ida_free(&cap_minors_map, MINOR(cap->dev_num));
384 	mutex_lock(&cap->mutex);
385 	cap->disabled = true;
386 	mutex_unlock(&cap->mutex);
389 	gb_connection_disable(cap->connection);
391 	/* Disallow new users to get access to the cap structure */
393 	list_del(&cap->node);
397 	 * All current users of cap would have taken a reference to it by
399 	 * cap freed.
401 	put_cap(cap);