1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Mediated device internal definitions
4  *
5  * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
6  *     Author: Neo Jia <cjia@nvidia.com>
7  *             Kirti Wankhede <kwankhede@nvidia.com>
8  */
9 
10 #ifndef MDEV_PRIVATE_H
11 #define MDEV_PRIVATE_H
12 
13 int  mdev_bus_register(void);
14 void mdev_bus_unregister(void);
15 
16 struct mdev_parent {
17 	struct device *dev;
18 	struct mdev_driver *mdev_driver;
19 	struct kref ref;
20 	struct list_head next;
21 	struct kset *mdev_types_kset;
22 	struct list_head type_list;
23 	/* Synchronize device creation/removal with parent unregistration */
24 	struct rw_semaphore unreg_sem;
25 };
26 
27 struct mdev_type {
28 	struct kobject kobj;
29 	struct kobject *devices_kobj;
30 	struct mdev_parent *parent;
31 	struct list_head next;
32 	unsigned int type_group_id;
33 };
34 
35 extern const struct attribute_group *mdev_device_groups[];
36 
37 #define to_mdev_type_attr(_attr)	\
38 	container_of(_attr, struct mdev_type_attribute, attr)
39 #define to_mdev_type(_kobj)		\
40 	container_of(_kobj, struct mdev_type, kobj)
41 
42 int  parent_create_sysfs_files(struct mdev_parent *parent);
43 void parent_remove_sysfs_files(struct mdev_parent *parent);
44 
45 int  mdev_create_sysfs_files(struct mdev_device *mdev);
46 void mdev_remove_sysfs_files(struct mdev_device *mdev);
47 
48 int mdev_device_create(struct mdev_type *kobj, const guid_t *uuid);
49 int  mdev_device_remove(struct mdev_device *dev);
50 
51 void mdev_release_parent(struct kref *kref);
52 
mdev_get_parent(struct mdev_parent * parent)53 static inline void mdev_get_parent(struct mdev_parent *parent)
54 {
55 	kref_get(&parent->ref);
56 }
57 
mdev_put_parent(struct mdev_parent * parent)58 static inline void mdev_put_parent(struct mdev_parent *parent)
59 {
60 	kref_put(&parent->ref, mdev_release_parent);
61 }
62 
63 #endif /* MDEV_PRIVATE_H */
64