notify.c

Go to the documentation of this file.

/*
 * All the USB notify logic
 *
 * (C) Copyright 2005 Greg Kroah-Hartman <[email protected]>
 *
 * notifier functions originally based on those in kernel/sys.c
 * but fixed up to not be so broken.
 *
 */


#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/notifier.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include "usb.h"

static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);

void usb_register_notify(struct notifier_block *nb)
{
    blocking_notifier_chain_register(&usb_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(usb_register_notify);

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)
{
    /* Protect against simultaneous usbfs open */
    mutex_lock(&usbfs_mutex);
    blocking_notifier_call_chain(&usb_notifier_list,
            USB_DEVICE_REMOVE, udev);
    mutex_unlock(&usbfs_mutex);
}

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);
}