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authorAntonino A. Daplas <adaplas@gmail.com>2006-07-30 03:04:17 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-31 13:28:44 -0700
commit256154fbc31c25a8df4d398232acfa9d4892224c (patch)
tree278582add1a28766a1f3f4dba2f250cdbb191e0a /drivers/video/fb_notify.c
parent834a9b8ca7a01c34570be021f88e18884a29f048 (diff)
[PATCH] fbdev: statically link the framebuffer notification functions
The backlight and lcd subsystems can be notified by the framebuffer layer of blanking events. However, these subsystems, as a whole, can function independently from the framebuffer layer. But in order to enable to the lcd and backlight subsystems, the framebuffer has to be compiled also, effectively sucking in a huge amount of unneeded code. To prevent dependency problems, separate out the framebuffer notification mechanism from the framebuffer layer and permanently link it to the kernel. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/fb_notify.c')
-rw-r--r--drivers/video/fb_notify.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/video/fb_notify.c b/drivers/video/fb_notify.c
new file mode 100644
index 00000000000..8c020389e4f
--- /dev/null
+++ b/drivers/video/fb_notify.c
@@ -0,0 +1,46 @@
+/*
+ * 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>
+
+static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
+
+/**
+ * fb_register_client - register a client notifier
+ * @nb: notifier block to callback on events
+ */
+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
+ */
+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
+ *
+ */
+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);