linux/drivers/video/fb_notify.c
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   1/*
   2 *  linux/drivers/video/fb_notify.c
   3 *
   4 *  Copyright (C) 2006 Antonino Daplas <adaplas@pol.net>
   5 *
   6 *      2001 - Documented with DocBook
   7 *      - Brad Douglas <brad@neruo.com>
   8 *
   9 * This file is subject to the terms and conditions of the GNU General Public
  10 * License.  See the file COPYING in the main directory of this archive
  11 * for more details.
  12 */
  13#include <linux/fb.h>
  14#include <linux/notifier.h>
  15#include <linux/export.h>
  16
  17static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
  18
  19/**
  20 *      fb_register_client - register a client notifier
  21 *      @nb: notifier block to callback on events
  22 */
  23int fb_register_client(struct notifier_block *nb)
  24{
  25        return blocking_notifier_chain_register(&fb_notifier_list, nb);
  26}
  27EXPORT_SYMBOL(fb_register_client);
  28
  29/**
  30 *      fb_unregister_client - unregister a client notifier
  31 *      @nb: notifier block to callback on events
  32 */
  33int fb_unregister_client(struct notifier_block *nb)
  34{
  35        return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
  36}
  37EXPORT_SYMBOL(fb_unregister_client);
  38
  39/**
  40 * fb_notifier_call_chain - notify clients of fb_events
  41 *
  42 */
  43int fb_notifier_call_chain(unsigned long val, void *v)
  44{
  45        return blocking_notifier_call_chain(&fb_notifier_list, val, v);
  46}
  47EXPORT_SYMBOL_GPL(fb_notifier_call_chain);
  48
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