59 	struct drm_dp_aux_dev *aux_dev = NULL;  in drm_dp_aux_dev_get_by_minor()  local
62 	aux_dev = idr_find(&aux_idr, index);  in drm_dp_aux_dev_get_by_minor()
63 	if (!kref_get_unless_zero(&aux_dev->refcount))  in drm_dp_aux_dev_get_by_minor()
64 		aux_dev = NULL;  in drm_dp_aux_dev_get_by_minor()
67 	return aux_dev;  in drm_dp_aux_dev_get_by_minor()
72 	struct drm_dp_aux_dev *aux_dev;  in alloc_drm_dp_aux_dev()  local
75 	aux_dev = kzalloc(sizeof(*aux_dev), GFP_KERNEL);  in alloc_drm_dp_aux_dev()
76 	if (!aux_dev)  in alloc_drm_dp_aux_dev()
78 	aux_dev->aux = aux;  in alloc_drm_dp_aux_dev()
79 	atomic_set(&aux_dev->usecount, 1);  in alloc_drm_dp_aux_dev()
80 	kref_init(&aux_dev->refcount);  in alloc_drm_dp_aux_dev()
83 	index = idr_alloc_cyclic(&aux_idr, aux_dev, 0, DRM_AUX_MINORS,  in alloc_drm_dp_aux_dev()
87 		kfree(aux_dev);  in alloc_drm_dp_aux_dev()
90 	aux_dev->index = index;  in alloc_drm_dp_aux_dev()
92 	return aux_dev;  in alloc_drm_dp_aux_dev()
97 	struct drm_dp_aux_dev *aux_dev =  in release_drm_dp_aux_dev()  local
100 	kfree(aux_dev);  in release_drm_dp_aux_dev()
107 	struct drm_dp_aux_dev *aux_dev =  in name_show()  local
110 	if (!aux_dev)  in name_show()
113 	res = sprintf(buf, "%s\n", aux_dev->aux->name);  in name_show()
114 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in name_show()
129 	struct drm_dp_aux_dev *aux_dev;  in auxdev_open()  local
131 	aux_dev = drm_dp_aux_dev_get_by_minor(minor);  in auxdev_open()
132 	if (!aux_dev)  in auxdev_open()
135 	file->private_data = aux_dev;  in auxdev_open()
146 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;  in auxdev_read_iter()  local
150 	if (!atomic_inc_not_zero(&aux_dev->usecount))  in auxdev_read_iter()
164 		res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);  in auxdev_read_iter()
180 	if (atomic_dec_and_test(&aux_dev->usecount))  in auxdev_read_iter()
181 		wake_up_var(&aux_dev->usecount);  in auxdev_read_iter()
188 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;  in auxdev_write_iter()  local
192 	if (!atomic_inc_not_zero(&aux_dev->usecount))  in auxdev_write_iter()
211 		res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);  in auxdev_write_iter()
222 	if (atomic_dec_and_test(&aux_dev->usecount))  in auxdev_write_iter()
223 		wake_up_var(&aux_dev->usecount);  in auxdev_write_iter()
230 	struct drm_dp_aux_dev *aux_dev = file->private_data;  in auxdev_release()  local
232 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in auxdev_release()
249 	struct drm_dp_aux_dev *iter, *aux_dev = NULL;  in drm_dp_aux_dev_get_by_aux()  local
260 			aux_dev = iter;  in drm_dp_aux_dev_get_by_aux()
265 	return aux_dev;  in drm_dp_aux_dev_get_by_aux()
270 	struct drm_dp_aux_dev *aux_dev;  in drm_dp_aux_unregister_devnode()  local
273 	aux_dev = drm_dp_aux_dev_get_by_aux(aux);  in drm_dp_aux_unregister_devnode()
274 	if (!aux_dev) /* attach must have failed */  in drm_dp_aux_unregister_devnode()
278 	idr_remove(&aux_idr, aux_dev->index);  in drm_dp_aux_unregister_devnode()
281 	atomic_dec(&aux_dev->usecount);  in drm_dp_aux_unregister_devnode()
282 	wait_var_event(&aux_dev->usecount, !atomic_read(&aux_dev->usecount));  in drm_dp_aux_unregister_devnode()
284 	minor = aux_dev->index;  in drm_dp_aux_unregister_devnode()
285 	if (aux_dev->dev)  in drm_dp_aux_unregister_devnode()
290 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in drm_dp_aux_unregister_devnode()
295 	struct drm_dp_aux_dev *aux_dev;  in drm_dp_aux_register_devnode()  local
298 	aux_dev = alloc_drm_dp_aux_dev(aux);  in drm_dp_aux_register_devnode()
299 	if (IS_ERR(aux_dev))  in drm_dp_aux_register_devnode()
300 		return PTR_ERR(aux_dev);  in drm_dp_aux_register_devnode()
302 	aux_dev->dev = device_create(drm_dp_aux_dev_class, aux->dev,  in drm_dp_aux_register_devnode()
303 				     MKDEV(drm_dev_major, aux_dev->index), NULL,  in drm_dp_aux_register_devnode()
304 				     "drm_dp_aux%d", aux_dev->index);  in drm_dp_aux_register_devnode()
305 	if (IS_ERR(aux_dev->dev)) {  in drm_dp_aux_register_devnode()
306 		res = PTR_ERR(aux_dev->dev);  in drm_dp_aux_register_devnode()
307 		aux_dev->dev = NULL;  in drm_dp_aux_register_devnode()
312 		  aux->name, aux_dev->index);  in drm_dp_aux_register_devnode()