| /* |
| * linux/drivers/video/fb_notify.c |
| * |
| * Copyright (C) 2006 Antonino Daplas <adaplas@pol.net> |
| * |
| * 2001 - Documented with DocBook |
| * - Brad Douglas <brad@neruo.com> |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file COPYING in the main directory of this archive |
| * for more details. |
| */ |
| #include <linux/fb.h> |
| #include <linux/notifier.h> |
| #include <linux/export.h> |
| |
| static BLOCKING_NOTIFIER_HEAD(fb_notifier_list); |
| |
| /** |
| * fb_register_client - register a client notifier |
| * @nb: notifier block to callback on events |
| * |
| * Return: 0 on success, negative error code on failure. |
| */ |
| int fb_register_client(struct notifier_block *nb) |
| { |
| return blocking_notifier_chain_register(&fb_notifier_list, nb); |
| } |
| EXPORT_SYMBOL(fb_register_client); |
| |
| /** |
| * fb_unregister_client - unregister a client notifier |
| * @nb: notifier block to callback on events |
| * |
| * Return: 0 on success, negative error code on failure. |
| */ |
| int fb_unregister_client(struct notifier_block *nb) |
| { |
| return blocking_notifier_chain_unregister(&fb_notifier_list, nb); |
| } |
| EXPORT_SYMBOL(fb_unregister_client); |
| |
| /** |
| * fb_notifier_call_chain - notify clients of fb_events |
| * @val: value passed to callback |
| * @v: pointer passed to callback |
| * |
| * Return: The return value of the last notifier function |
| */ |
| int fb_notifier_call_chain(unsigned long val, void *v) |
| { |
| return blocking_notifier_call_chain(&fb_notifier_list, val, v); |
| } |
| EXPORT_SYMBOL_GPL(fb_notifier_call_chain); |
