Also keep the backlight on in mpegplayer when plugged in. Fixes FS #7584. Created two helper functions for this, because this issue also exists in other plugins (to do). The helper functions are in the pluginlib in helper.[ch], where other common stuff can be put.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14321 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/helper.c

@@ -0,0 +1,46 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: helper.c 12179 2007-08-14 23:08:15Z peter $
+ *
+ * Copyright (C) 2007 by Peter D'Hoye
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+
+/* the plugin must declare the plugin_api struct pointer itself */
+extern struct plugin_api* rb;
+
+/* force the backlight on */
+void backlight_force_on(void)
+{
+#ifdef HAVE_BACKLIGHT
+    rb->backlight_set_timeout(1);
+#if CONFIG_CHARGING
+    rb->backlight_set_timeout_plugged(1);
+#endif
+#endif
+}    
+
+/* reset backlight operation to its settings */
+void backlight_use_settings(void)
+{
+#ifdef HAVE_BACKLIGHT
+    rb->backlight_set_timeout(rb->global_settings->backlight_timeout);
+#if CONFIG_CHARGING
+    rb->backlight_set_timeout_plugged(rb->global_settings-> \
+                                                     backlight_timeout_plugged);
+#endif
+#endif
+}