Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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/device.h>
11#include <linux/iommu.h>
12#include <linux/mdev.h>
13
14#include "mdev_private.h"
15
16static int mdev_probe(struct device *dev)
17{
18 struct mdev_driver *drv =
19 container_of(dev->driver, struct mdev_driver, driver);
20
21 if (!drv->probe)
22 return 0;
23 return drv->probe(to_mdev_device(dev));
24}
25
26static void mdev_remove(struct device *dev)
27{
28 struct mdev_driver *drv =
29 container_of(dev->driver, struct mdev_driver, driver);
30
31 if (drv->remove)
32 drv->remove(to_mdev_device(dev));
33}
34
35static int mdev_match(struct device *dev, struct device_driver *drv)
36{
37 /*
38 * No drivers automatically match. Drivers are only bound by explicit
39 * device_driver_attach()
40 */
41 return 0;
42}
43
44struct bus_type mdev_bus_type = {
45 .name = "mdev",
46 .probe = mdev_probe,
47 .remove = mdev_remove,
48 .match = mdev_match,
49};
50EXPORT_SYMBOL_GPL(mdev_bus_type);
51
52/**
53 * mdev_register_driver - register a new MDEV driver
54 * @drv: the driver to register
55 *
56 * Returns a negative value on error, otherwise 0.
57 **/
58int mdev_register_driver(struct mdev_driver *drv)
59{
60 /* initialize common driver fields */
61 drv->driver.bus = &mdev_bus_type;
62
63 /* register with core */
64 return driver_register(&drv->driver);
65}
66EXPORT_SYMBOL(mdev_register_driver);
67
68/*
69 * mdev_unregister_driver - unregister MDEV driver
70 * @drv: the driver to unregister
71 */
72void mdev_unregister_driver(struct mdev_driver *drv)
73{
74 driver_unregister(&drv->driver);
75}
76EXPORT_SYMBOL(mdev_unregister_driver);
77
78int mdev_bus_register(void)
79{
80 return bus_register(&mdev_bus_type);
81}
82
83void mdev_bus_unregister(void)
84{
85 bus_unregister(&mdev_bus_type);
86}