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 | |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/notifier.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 14 | #include <linux/usb.h> |
Arjan van de Ven | 4186ecf | 2006-01-11 15:55:29 +0100 | [diff] [blame] | 15 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 16 | #include "usb.h" |
| 17 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 18 | static BLOCKING_NOTIFIER_HEAD(usb_notifier_list); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 19 | |
| 20 | /** |
| 21 | * usb_register_notify - register a notifier callback whenever a usb change happens |
| 22 | * @nb: pointer to the notifier block for the callback events. |
| 23 | * |
| 24 | * These changes are either USB devices or busses being added or removed. |
| 25 | */ |
| 26 | void usb_register_notify(struct notifier_block *nb) |
| 27 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 28 | blocking_notifier_chain_register(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 29 | } |
| 30 | EXPORT_SYMBOL_GPL(usb_register_notify); |
| 31 | |
| 32 | /** |
| 33 | * usb_unregister_notify - unregister a notifier callback |
| 34 | * @nb: pointer to the notifier block for the callback events. |
| 35 | * |
| 36 | * usb_register_notifier() must have been previously called for this function |
| 37 | * to work properly. |
| 38 | */ |
| 39 | void usb_unregister_notify(struct notifier_block *nb) |
| 40 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 41 | blocking_notifier_chain_unregister(&usb_notifier_list, nb); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 42 | } |
| 43 | EXPORT_SYMBOL_GPL(usb_unregister_notify); |
| 44 | |
| 45 | |
| 46 | void usb_notify_add_device(struct usb_device *udev) |
| 47 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 48 | blocking_notifier_call_chain(&usb_notifier_list, USB_DEVICE_ADD, udev); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | void usb_notify_remove_device(struct usb_device *udev) |
| 52 | { |
Alan Stern | 4a2a8a2 | 2006-07-01 22:05:01 -0400 | [diff] [blame^] | 53 | /* Protect against simultaneous usbfs open */ |
| 54 | mutex_lock(&usbfs_mutex); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 55 | blocking_notifier_call_chain(&usb_notifier_list, |
| 56 | USB_DEVICE_REMOVE, udev); |
Alan Stern | 4a2a8a2 | 2006-07-01 22:05:01 -0400 | [diff] [blame^] | 57 | mutex_unlock(&usbfs_mutex); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | void usb_notify_add_bus(struct usb_bus *ubus) |
| 61 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 62 | blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_ADD, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | void usb_notify_remove_bus(struct usb_bus *ubus) |
| 66 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 67 | blocking_notifier_call_chain(&usb_notifier_list, USB_BUS_REMOVE, ubus); |
Greg Kroah-Hartman | 3099e75 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 68 | } |