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68 lines
1.7 KiB
68 lines
1.7 KiB
// 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 <[email protected]> |
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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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blocking_notifier_call_chain(&usb_notifier_list, |
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USB_DEVICE_REMOVE, udev); |
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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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