375  * @brief Helper function for checking if particular entity is a part of
378  * This function checks if given entity is a part of given audio device.
383  *	 descriptors are known and are not using any other entity type.
388  * @param [in, out] entity	   USB Audio entity.
389  *				   .id      [in]  id of searched entity
390  *				   .subtype [out] subtype of entity (if found)
392  * @return true if entity matched audio_dev_data, false otherwise.
395 			    struct usb_audio_entity *entity)  in is_entity_valid()  argument
404 	if (fu->bUnitID == entity->id) {  in is_entity_valid()
405 		entity->subtype = fu->bDescriptorSubtype;  in is_entity_valid()
414 		if (fu->bUnitID == entity->id) {  in is_entity_valid()
415 			entity->subtype = fu->bDescriptorSubtype;  in is_entity_valid()
424  * @brief Helper function for getting the audio_dev_data by the entity number.
427  * entity number and return the audio_dev_data structure for this entity.
429  * @param [in, out] entity USB Audio entity addressed by the request.
430  *			   .id      [in]  id of searched entity
431  *			   .subtype [out] subtype of entity (if found)
433  * @return audio_dev_data for given entity, NULL if not found.
436 					struct usb_audio_entity *entity)  in get_audio_dev_data_by_entity()  argument
446 		if (is_entity_valid(audio_dev_data, entity)) {  in get_audio_dev_data_by_entity()
717 	struct usb_audio_entity entity;  in handle_interface_req()  local
722 	entity.id = entity_id;  in handle_interface_req()
731 	 * entity is addressed. Because of that there is a need to obtain  in handle_interface_req()
732 	 * this information from the device descriptor using entity id.  in handle_interface_req()
734 	audio_dev_data = get_audio_dev_data_by_entity(&entity);  in handle_interface_req()
737 		LOG_ERR("Device data not found for entity %u", entity.id);  in handle_interface_req()
741 	switch (entity.subtype) {  in handle_interface_req()