drivers/video/fbdev/core/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 #include <linux/export.h>
  16
  17 static 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  */
  23 int fb_register_client(struct notifier_block *nb)
  24 {
  25         return blocking_notifier_chain_register(&fb_notifier_list, nb);
  26 }
  27 EXPORT_SYMBOL(fb_register_client);
  28
  29 /**
  30  *      fb_unregister_client - unregister a client notifier
  31  *      @nb: notifier block to callback on events
  32  */
  33 int fb_unregister_client(struct notifier_block *nb)
  34 {
  35         return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
  36 }
  37 EXPORT_SYMBOL(fb_unregister_client);
  38
  39 /**
  40  * fb_notifier_call_chain - notify clients of fb_events
  41  *
  42  */
  43 int fb_notifier_call_chain(unsigned long val, void *v)
  44 {
  45         return blocking_notifier_call_chain(&fb_notifier_list, val, v);
  46 }
  47 EXPORT_SYMBOL_GPL(fb_notifier_call_chain);