]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/usb/core/notify.c
2 * All the USB notify logic
4 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
6 * notifier functions originally based on those in kernel/sys.c
7 * but fixed up to not be so broken.
12 #include <linux/kernel.h>
13 #include <linux/export.h>
14 #include <linux/notifier.h>
15 #include <linux/usb.h>
16 #include <linux/mutex.h>
19 static BLOCKING_NOTIFIER_HEAD(usb_notifier_list
);
22 * usb_register_notify - register a notifier callback whenever a usb change happens
23 * @nb: pointer to the notifier block for the callback events.
25 * These changes are either USB devices or busses being added or removed.
27 void usb_register_notify(struct notifier_block
*nb
)
29 blocking_notifier_chain_register(&usb_notifier_list
, nb
);
31 EXPORT_SYMBOL_GPL(usb_register_notify
);
34 * usb_unregister_notify - unregister a notifier callback
35 * @nb: pointer to the notifier block for the callback events.
37 * usb_register_notify() must have been previously called for this function
40 void usb_unregister_notify(struct notifier_block
*nb
)
42 blocking_notifier_chain_unregister(&usb_notifier_list
, nb
);
44 EXPORT_SYMBOL_GPL(usb_unregister_notify
);
47 void usb_notify_add_device(struct usb_device
*udev
)
49 blocking_notifier_call_chain(&usb_notifier_list
, USB_DEVICE_ADD
, udev
);
52 void usb_notify_remove_device(struct usb_device
*udev
)
54 /* Protect against simultaneous usbfs open */
55 mutex_lock(&usbfs_mutex
);
56 blocking_notifier_call_chain(&usb_notifier_list
,
57 USB_DEVICE_REMOVE
, udev
);
58 mutex_unlock(&usbfs_mutex
);
61 void usb_notify_add_bus(struct usb_bus
*ubus
)
63 blocking_notifier_call_chain(&usb_notifier_list
, USB_BUS_ADD
, ubus
);
66 void usb_notify_remove_bus(struct usb_bus
*ubus
)
68 blocking_notifier_call_chain(&usb_notifier_list
, USB_BUS_REMOVE
, ubus
);