fbcon notified of suspend/resume

Hi !

This patch makes fbcon ask for notification of events from fbdev to deal with suspend/resume (stop cursor on suspend, refresh screen on resume). Could probably do more (like dealing better with the cursor timer), but this simple implementation works fine enough for now.

Ben.

# This is a BitKeeper generated diff -Nru style patch. #
# ChangeSet

#   2004/02/15 18:19:47+11:00 [email protected] 
#   fbcon request suspend/resume events from fbdev's and uses that
#   to refresh the display properly on wakeup
# 
# drivers/video/console/fbcon.c
#   2004/02/15 18:19:23+11:00 [email protected] +52 -0
#   fbcon request suspend/resume events from fbdev's and uses that
#   to refresh the display properly on wakeup
# 
diff -Nru a/drivers/video/console/fbcon.c
b/drivers/video/console/fbcon.c
--- a/drivers/video/console/fbcon.c	Sun Feb 15 18:22:04 2004
+++ b/drivers/video/console/fbcon.c	Sun Feb 15 18:22:04 2004
@@ -2266,6 +2266,39 @@
 	return 0;
 }

+static void fbcon_suspended(struct fb_info *info)
+{
+ /* Clear cursor, restore saved data */
+ info->cursor.enable = 0;
+ info->fbops->fb_cursor(info, &info->cursor);
+}
+
+static void fbcon_resumed(struct fb_info *info)
+{
+ struct vc_data *vc;
+
+ if (info->currcon < 0)
+ return;
+ vc = vc_cons[info->currcon].d;
+
+ update_screen(vc->vc_num);
+}
+static int fbcon_event_notify(struct notifier_block *self,
+ unsigned long action, void *data)
+{
+ struct fb_info *info = (struct fb_info *) data;
+
+ switch(action) {
+ case FB_EVENT_SUSPEND:
+ fbcon_suspended(info);
+ break;
+ case FB_EVENT_RESUME:
+ fbcon_resumed(info);
+ break;
+ }
+ return 0;
+}
+
/*
* The console `switch' structure for the frame buffer based console */
@@ -2292,16 +2325,35 @@
.con_resize = fbcon_resize,
};

+static struct notifier_block fbcon_event_notifer = {
+ .notifier_call = fbcon_event_notify,
+};
+
+static int fbcon_event_notifier_registered;
+
int __init fb_console_init(void)
{
if (!num_registered_fb)
return -ENODEV;
take_over_console(&fb_con, first_fb_vc, last_fb_vc, fbcon_is_default);
+ acquire_console_sem();
+ if (!fbcon_event_notifier_registered) {
+ fb_register_client(&fbcon_event_notifer);
+ fbcon_event_notifier_registered = 1;
+ }
+ release_console_sem();
+
return 0;
}

void __exit fb_console_exit(void)
{
+ acquire_console_sem();
+ if (fbcon_event_notifier_registered) {
+ fb_unregister_client(&fbcon_event_notifer);
+ fbcon_event_notifier_registered = 0;
+ }
+ release_console_sem();
give_up_console(&fb_con);
}