drm/display/drm_dp_aux_dev.c

62 	struct drm_dp_aux_dev *aux_dev = NULL;
65 	aux_dev = idr_find(&aux_idr, index);
66 	if (aux_dev && !kref_get_unless_zero(&aux_dev->refcount))
67 		aux_dev = NULL;
70 	return aux_dev;
75 	struct drm_dp_aux_dev *aux_dev;
78 	aux_dev = kzalloc(sizeof(*aux_dev), GFP_KERNEL);
79 	if (!aux_dev)
81 	aux_dev->aux = aux;
82 	atomic_set(&aux_dev->usecount, 1);
83 	kref_init(&aux_dev->refcount);
86 	index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);
89 		kfree(aux_dev);
92 	aux_dev->index = index;
94 	return aux_dev;
99 	struct drm_dp_aux_dev *aux_dev =
102 	kfree(aux_dev);
109 	struct drm_dp_aux_dev *aux_dev =
112 	if (!aux_dev)
115 	res = sprintf(buf, "%s\n", aux_dev->aux->name);
116 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
131 	struct drm_dp_aux_dev *aux_dev;
133 	aux_dev = drm_dp_aux_dev_get_by_minor(minor);
134 	if (!aux_dev)
137 	file->private_data = aux_dev;
148 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
152 	if (!atomic_inc_not_zero(&aux_dev->usecount))
166 		res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);
183 	if (atomic_dec_and_test(&aux_dev->usecount))
184 		wake_up_var(&aux_dev->usecount);
191 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
195 	if (!atomic_inc_not_zero(&aux_dev->usecount))
214 		res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);
226 	if (atomic_dec_and_test(&aux_dev->usecount))
227 		wake_up_var(&aux_dev->usecount);
234 	struct drm_dp_aux_dev *aux_dev = file->private_data;
236 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
253 	struct drm_dp_aux_dev *iter, *aux_dev = NULL;
264 			aux_dev = iter;
269 	return aux_dev;
274 	struct drm_dp_aux_dev *aux_dev;
277 	aux_dev = drm_dp_aux_dev_get_by_aux(aux);
278 	if (!aux_dev) /* attach must have failed */
288 	idr_remove(&aux_idr, aux_dev->index);
291 	atomic_dec(&aux_dev->usecount);
292 	wait_var_event(&aux_dev->usecount, !atomic_read(&aux_dev->usecount));
294 	minor = aux_dev->index;
295 	if (aux_dev->dev)
300 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
305 	struct drm_dp_aux_dev *aux_dev;
308 	aux_dev = alloc_drm_dp_aux_dev(aux);
309 	if (IS_ERR(aux_dev))
310 		return PTR_ERR(aux_dev);
312 	aux_dev->dev = device_create(drm_dp_aux_dev_class, aux->dev,
313 				     MKDEV(drm_dev_major, aux_dev->index), NULL,
314 				     "drm_dp_aux%d", aux_dev->index);
315 	if (IS_ERR(aux_dev->dev)) {
316 		res = PTR_ERR(aux_dev->dev);
317 		aux_dev->dev = NULL;
322 		  aux->name, aux_dev->index);