| 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 | * Return: 0 on success, negative error code on failure. |
| 24 | */ |
| 25 | int fb_register_client(struct notifier_block *nb) |
| 26 | { |
| 27 | return blocking_notifier_chain_register(nh: &fb_notifier_list, nb); |
| 28 | } |
| 29 | EXPORT_SYMBOL(fb_register_client); |
| 30 | |
| 31 | /** |
| 32 | * fb_unregister_client - unregister a client notifier |
| 33 | * @nb: notifier block to callback on events |
| 34 | * |
| 35 | * Return: 0 on success, negative error code on failure. |
| 36 | */ |
| 37 | int fb_unregister_client(struct notifier_block *nb) |
| 38 | { |
| 39 | return blocking_notifier_chain_unregister(nh: &fb_notifier_list, nb); |
| 40 | } |
| 41 | EXPORT_SYMBOL(fb_unregister_client); |
| 42 | |
| 43 | /** |
| 44 | * fb_notifier_call_chain - notify clients of fb_events |
| 45 | * @val: value passed to callback |
| 46 | * @v: pointer passed to callback |
| 47 | * |
| 48 | * Return: The return value of the last notifier function |
| 49 | */ |
| 50 | int fb_notifier_call_chain(unsigned long val, void *v) |
| 51 | { |
| 52 | return blocking_notifier_call_chain(nh: &fb_notifier_list, val, v); |
| 53 | } |
| 54 | EXPORT_SYMBOL_GPL(fb_notifier_call_chain); |
| 55 |