1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MDEV driver
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#include <linux/iommu.h>
11#include <linux/mdev.h>
12
13#include "mdev_private.h"
14
15static int mdev_probe(struct device *dev)
16{
17	struct mdev_driver *drv =
18		container_of(dev->driver, struct mdev_driver, driver);
19
20	if (!drv->probe)
21		return 0;
22	return drv->probe(to_mdev_device(dev));
23}
24
25static void mdev_remove(struct device *dev)
26{
27	struct mdev_driver *drv =
28		container_of(dev->driver, struct mdev_driver, driver);
29
30	if (drv->remove)
31		drv->remove(to_mdev_device(dev));
32}
33
34static int mdev_match(struct device *dev, struct device_driver *drv)
35{
36	/*
37	 * No drivers automatically match. Drivers are only bound by explicit
38	 * device_driver_attach()
39	 */
40	return 0;
41}
42
43const struct bus_type mdev_bus_type = {
44	.name		= "mdev",
45	.probe		= mdev_probe,
46	.remove		= mdev_remove,
47	.match		= mdev_match,
48};
49
50/**
51 * mdev_register_driver - register a new MDEV driver
52 * @drv: the driver to register
53 *
54 * Returns a negative value on error, otherwise 0.
55 **/
56int mdev_register_driver(struct mdev_driver *drv)
57{
58	if (!drv->device_api)
59		return -EINVAL;
60
61	/* initialize common driver fields */
62	drv->driver.bus = &mdev_bus_type;
63	return driver_register(&drv->driver);
64}
65EXPORT_SYMBOL(mdev_register_driver);
66
67/*
68 * mdev_unregister_driver - unregister MDEV driver
69 * @drv: the driver to unregister
70 */
71void mdev_unregister_driver(struct mdev_driver *drv)
72{
73	driver_unregister(&drv->driver);
74}
75EXPORT_SYMBOL(mdev_unregister_driver);
76