From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/usb/core/notify.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 drivers/usb/core/notify.c (limited to 'drivers/usb/core/notify.c') diff --git a/drivers/usb/core/notify.c b/drivers/usb/core/notify.c new file mode 100644 index 000000000..e61436637 --- /dev/null +++ b/drivers/usb/core/notify.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * All the USB notify logic + * + * (C) Copyright 2005 Greg Kroah-Hartman + * + * notifier functions originally based on those in kernel/sys.c + * but fixed up to not be so broken. + * + * Released under the GPLv2 only. + */ + + +#include +#include +#include +#include +#include +#include "usb.h" + +static BLOCKING_NOTIFIER_HEAD(usb_notifier_list); + +/** + * usb_register_notify - register a notifier callback whenever a usb change happens + * @nb: pointer to the notifier block for the callback events. + * + * These changes are either USB devices or busses being added or removed. + */ +void usb_register_notify(struct notifier_block *nb) +{ + blocking_notifier_chain_register(&usb_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(usb_register_notify); + +/** + * usb_unregister_notify - unregister a notifier callback + * @nb: pointer to the notifier block for the callback events. + * + * usb_register_notify() must have been previously called for this function + * to work properly. + */ +void usb_unregister_notify(struct notifier_block *nb) +{ + blocking_notifier_chain_unregister(&usb_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(usb_unregister_notify); + + +void usb_notify_add_device(struct usb_device *udev) +{ + blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev); +} + +void usb_notify_remove_device(struct usb_device *udev) +{ + blocking_notifier_call_chain(&usb_notifier_list, + USB_DEVICE_REMOVE, udev); +} + +void usb_notify_add_bus(struct usb_bus *ubus) +{ + blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus); +} + +void usb_notify_remove_bus(struct usb_bus *ubus) +{ + blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus); +} -- cgit v1.2.3