/*
 * All the USB notify logic
 *
 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
 *
 * notifier functions originally based on those in kernel/sys.c
 * but fixed up to not be so broken.
 *
 * Released under the GPLv2 only.
 * SPDX-License-Identifier: GPL-2.0
 */


#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);

/**
 * usb_register_notify - register a notifier callback whenever a usb change happens
 * @nb: pointer to the notifier block for the callback events.
 *
 * These changes are either USB devices or busses being added or removed.
 */
void usb_register_notify(struct notifier_block *nb)
{
	blocking_notifier_chain_register(&usb_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(usb_register_notify);

/**
 * usb_unregister_notify - unregister a notifier callback
 * @nb: pointer to the notifier block for the callback events.
 *
 * usb_register_notify() must have been previously called for this function
 * to work properly.
 */
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);
}
ip?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/rockchip?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/rockchip?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/sound/soc/rockchip'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='6bb19474391d17954fee9a9997ecca25b35dfd46'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/rockchip?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46'>rockchip</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/rockchip?h=nds-private-remove&amp;id=6bb19474391d17954fee9a9997ecca25b35dfd46&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>