Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 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 | * |
Greg Kroah-Hartman | b65fba3 | 2016-10-28 17:16:36 -0400 | [diff] [blame] | 9 | * Released under the GPLv2 only. |
| 10 | * SPDX-License-Identifier: GPL-2.0 |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Paul Gortmaker | f940fcd | 2011-05-27 09:56:31 -0400 | [diff] [blame] | 15 | #include <linux/export.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 16 | #include <linux/notifier.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 17 | #include <linux/usb.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 19 | #include "usb.h" |
| 20 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 21 | static BLOCKING_NOTIFIER_HEAD(usb_notifier_list); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 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 | */ |
| 29 | void usb_register_notify(struct notifier_block *nb) |
| 30 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 31 | blocking_notifier_chain_register(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 32 | } |
| 33 | EXPORT_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 | * |
Manish Katiyar | da28762 | 2007-12-15 11:01:14 +0530 | [diff] [blame] | 39 | * usb_register_notify() must have been previously called for this function |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 40 | * to work properly. |
| 41 | */ |
| 42 | void usb_unregister_notify(struct notifier_block *nb) |
| 43 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 44 | blocking_notifier_chain_unregister(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 45 | } |
| 46 | EXPORT_SYMBOL_GPL(usb_unregister_notify); |
| 47 | |
| 48 | |
| 49 | void usb_notify_add_device(struct usb_device *udev) |
| 50 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 51 | blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | void usb_notify_remove_device(struct usb_device *udev) |
| 55 | { |
Alan Stern | 4a2a8a2 | 2006-07-01 22:05:01 -0400 | [diff] [blame] | 56 | /* Protect against simultaneous usbfs open */ |
| 57 | mutex_lock(&usbfs_mutex); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 58 | blocking_notifier_call_chain(&usb_notifier_list, |
| 59 | USB_DEVICE_REMOVE, udev); |
Alan Stern | 4a2a8a2 | 2006-07-01 22:05:01 -0400 | [diff] [blame] | 60 | mutex_unlock(&usbfs_mutex); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | void usb_notify_add_bus(struct usb_bus *ubus) |
| 64 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 65 | blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | void usb_notify_remove_bus(struct usb_bus *ubus) |
| 69 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 70 | blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 71 | } |