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
mdev_probe(struct device * dev)16 static 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
mdev_remove(struct device * dev)26 static 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
mdev_match(struct device * dev,struct device_driver * drv)35 static 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
44 struct bus_type mdev_bus_type = {
45 .name = "mdev",
46 .probe = mdev_probe,
47 .remove = mdev_remove,
48 .match = mdev_match,
49 };
50 EXPORT_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 **/
mdev_register_driver(struct mdev_driver * drv)58 int 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 }
66 EXPORT_SYMBOL(mdev_register_driver);
67
68 /*
69 * mdev_unregister_driver - unregister MDEV driver
70 * @drv: the driver to unregister
71 */
mdev_unregister_driver(struct mdev_driver * drv)72 void mdev_unregister_driver(struct mdev_driver *drv)
73 {
74 driver_unregister(&drv->driver);
75 }
76 EXPORT_SYMBOL(mdev_unregister_driver);
77
mdev_bus_register(void)78 int mdev_bus_register(void)
79 {
80 return bus_register(&mdev_bus_type);
81 }
82
mdev_bus_unregister(void)83 void mdev_bus_unregister(void)
84 {
85 bus_unregister(&mdev_bus_type);
86 }
87