aa1f3bb567
To match the rest of the kernel, the SPDX tags for the drivers/usb/core/ files are moved to the first line of the file. This makes it more obvious the tag is present as well as making it match the other 12k files in the tree with this location. It also uses // to match the "expected style" as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* All the USB notify logic
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*
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* (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* notifier functions originally based on those in kernel/sys.c
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* but fixed up to not be so broken.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/notifier.h>
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#include <linux/usb.h>
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#include <linux/mutex.h>
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#include "usb.h"
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static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);
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/**
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* usb_register_notify - register a notifier callback whenever a usb change happens
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* @nb: pointer to the notifier block for the callback events.
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*
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* These changes are either USB devices or busses being added or removed.
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*/
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void usb_register_notify(struct notifier_block *nb)
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{
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blocking_notifier_chain_register(&usb_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(usb_register_notify);
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/**
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* usb_unregister_notify - unregister a notifier callback
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* @nb: pointer to the notifier block for the callback events.
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*
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* usb_register_notify() must have been previously called for this function
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* to work properly.
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*/
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void usb_unregister_notify(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&usb_notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(usb_unregister_notify);
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void usb_notify_add_device(struct usb_device *udev)
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{
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blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev);
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}
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void usb_notify_remove_device(struct usb_device *udev)
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{
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/* Protect against simultaneous usbfs open */
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mutex_lock(&usbfs_mutex);
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blocking_notifier_call_chain(&usb_notifier_list,
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USB_DEVICE_REMOVE, udev);
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mutex_unlock(&usbfs_mutex);
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}
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void usb_notify_add_bus(struct usb_bus *ubus)
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{
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blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus);
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}
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void usb_notify_remove_bus(struct usb_bus *ubus)
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{
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blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus);
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}
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