1/*
 2 * All the USB notify logic
 3 *
 4 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
 5 *
 6 * notifier functions originally based on those in kernel/sys.c
 7 * but fixed up to not be so broken.
 8 *
 
 9 */
10
11
12#include <linux/kernel.h>
 
13#include <linux/notifier.h>
14#include <linux/usb.h>
15#include <linux/mutex.h>
16#include "usb.h"
17
18static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);
19
20/**
21 * usb_register_notify - register a notifier callback whenever a usb change happens
22 * @nb: pointer to the notifier block for the callback events.
23 *
24 * These changes are either USB devices or busses being added or removed.
25 */
26void usb_register_notify(struct notifier_block *nb)
27{
28	blocking_notifier_chain_register(&usb_notifier_list, nb);
29}
30EXPORT_SYMBOL_GPL(usb_register_notify);
31
32/**
33 * usb_unregister_notify - unregister a notifier callback
34 * @nb: pointer to the notifier block for the callback events.
35 *
36 * usb_register_notify() must have been previously called for this function
37 * to work properly.
38 */
39void usb_unregister_notify(struct notifier_block *nb)
40{
41	blocking_notifier_chain_unregister(&usb_notifier_list, nb);
42}
43EXPORT_SYMBOL_GPL(usb_unregister_notify);
44
45
46void usb_notify_add_device(struct usb_device *udev)
47{
48	blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev);
49}
50
51void usb_notify_remove_device(struct usb_device *udev)
52{
53	/* Protect against simultaneous usbfs open */
54	mutex_lock(&usbfs_mutex);
55	blocking_notifier_call_chain(&usb_notifier_list,
56			USB_DEVICE_REMOVE, udev);
57	mutex_unlock(&usbfs_mutex);
58}
59
60void usb_notify_add_bus(struct usb_bus *ubus)
61{
62	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus);
63}
64
65void usb_notify_remove_bus(struct usb_bus *ubus)
66{
67	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus);
68}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * All the USB notify logic
 4 *
 5 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
 6 *
 7 * notifier functions originally based on those in kernel/sys.c
 8 * but fixed up to not be so broken.
 9 *
10 * Released under the GPLv2 only.
11 */
12
13
14#include <linux/kernel.h>
15#include <linux/export.h>
16#include <linux/notifier.h>
17#include <linux/usb.h>
18#include <linux/mutex.h>
19#include "usb.h"
20
21static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);
22
23/**
24 * usb_register_notify - register a notifier callback whenever a usb change happens
25 * @nb: pointer to the notifier block for the callback events.
26 *
27 * These changes are either USB devices or busses being added or removed.
28 */
29void usb_register_notify(struct notifier_block *nb)
30{
31	blocking_notifier_chain_register(&usb_notifier_list, nb);
32}
33EXPORT_SYMBOL_GPL(usb_register_notify);
34
35/**
36 * usb_unregister_notify - unregister a notifier callback
37 * @nb: pointer to the notifier block for the callback events.
38 *
39 * usb_register_notify() must have been previously called for this function
40 * to work properly.
41 */
42void usb_unregister_notify(struct notifier_block *nb)
43{
44	blocking_notifier_chain_unregister(&usb_notifier_list, nb);
45}
46EXPORT_SYMBOL_GPL(usb_unregister_notify);
47
48
49void usb_notify_add_device(struct usb_device *udev)
50{
51	blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev);
52}
53
54void usb_notify_remove_device(struct usb_device *udev)
55{
56	/* Protect against simultaneous usbfs open */
57	mutex_lock(&usbfs_mutex);
58	blocking_notifier_call_chain(&usb_notifier_list,
59			USB_DEVICE_REMOVE, udev);
60	mutex_unlock(&usbfs_mutex);
61}
62
63void usb_notify_add_bus(struct usb_bus *ubus)
64{
65	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus);
66}
67
68void usb_notify_remove_bus(struct usb_bus *ubus)
69{
70	blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus);
71}