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 | * |
| 9 | */ |
| 10 | |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/notifier.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 15 | #include <linux/usb.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 16 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 17 | #include "usb.h" |
| 18 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 19 | static BLOCKING_NOTIFIER_HEAD(usb_notifier_list); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 20 | |
| 21 | /** |
| 22 | * usb_register_notify - register a notifier callback whenever a usb change happens |
| 23 | * @nb: pointer to the notifier block for the callback events. |
| 24 | * |
| 25 | * These changes are either USB devices or busses being added or removed. |
| 26 | */ |
| 27 | void usb_register_notify(struct notifier_block *nb) |
| 28 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 29 | blocking_notifier_chain_register(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 30 | } |
| 31 | EXPORT_SYMBOL_GPL(usb_register_notify); |
| 32 | |
| 33 | /** |
| 34 | * usb_unregister_notify - unregister a notifier callback |
| 35 | * @nb: pointer to the notifier block for the callback events. |
| 36 | * |
| 37 | * usb_register_notifier() must have been previously called for this function |
| 38 | * to work properly. |
| 39 | */ |
| 40 | void usb_unregister_notify(struct notifier_block *nb) |
| 41 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 42 | blocking_notifier_chain_unregister(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 43 | } |
| 44 | EXPORT_SYMBOL_GPL(usb_unregister_notify); |
| 45 | |
| 46 | |
| 47 | void usb_notify_add_device(struct usb_device *udev) |
| 48 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 49 | blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | void usb_notify_remove_device(struct usb_device *udev) |
| 53 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 54 | blocking_notifier_call_chain(&usb_notifier_list, |
| 55 | USB_DEVICE_REMOVE, udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | void usb_notify_add_bus(struct usb_bus *ubus) |
| 59 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame^] | 60 | blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | void usb_notify_remove_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_REMOVE, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 66 | } |