drivers/video/fb_notify.c

   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
  16 static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
  17
  18 /**
  19  *      fb_register_client - register a client notifier
  20  *      @nb: notifier block to callback on events
  21  */
  22 int fb_register_client(struct notifier_block *nb)
  23 {
  24         return blocking_notifier_chain_register(&fb_notifier_list, nb);
  25 }
  26 EXPORT_SYMBOL(fb_register_client);
  27
  28 /**
  29  *      fb_unregister_client - unregister a client notifier
  30  *      @nb: notifier block to callback on events
  31  */
  32 int fb_unregister_client(struct notifier_block *nb)
  33 {
  34         return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
  35 }
  36 EXPORT_SYMBOL(fb_unregister_client);
  37
  38 /**
  39  * fb_notifier_call_chain - notify clients of fb_events
  40  *
  41  */
  42 int fb_notifier_call_chain(unsigned long val, void *v)
  43 {
  44         return blocking_notifier_call_chain(&fb_notifier_list, val, v);
  45 }
  46 EXPORT_SYMBOL_GPL(fb_notifier_call_chain);