1 files changed, 87 insertions, 0 deletions

diff --git a/firmware/backlight-sw-fading.c b/firmware/backlight-sw-fading.c
new file mode 100644
index 0000000000..d7987567ce
--- /dev/null
+++ b/firmware/backlight-sw-fading.c
@@ -0,0 +1,87 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 by Thomas Martitz
+ * Copyright (C) 2008 by Martin Ritter
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdbool.h>
+#include "backlight-target.h"
+#include "config.h"
+#include "system.h"
+#include "backlight.h"
+#include "backlight-sw-fading.h"
+
+/* To adapt a target do:
+ * - make sure _backlight_on doesn't set the brightness to something other than
+ *  the previous value (lowest brightness in most cases)
+ * - #define USE_BACKLIGHT_SW_FADING in config-<target>.h
+ */
+
+/* can be MIN_BRIGHTNESS_SETTING-1 */
+static int current_brightness = DEFAULT_BRIGHTNESS_SETTING;
+
+void _backlight_fade_update_state(int brightness)
+{
+    current_brightness = brightness;
+}
+
+/* returns true if fade is finished */
+static bool _backlight_fade_up(void)
+{
+    if (LIKELY(current_brightness < backlight_brightness))
+    {
+        _backlight_set_brightness(++current_brightness);
+    }
+    return(current_brightness >= backlight_brightness);
+}
+
+/* returns true if fade is finished */
+static bool _backlight_fade_down(void)
+{
+    if (LIKELY(current_brightness > MIN_BRIGHTNESS_SETTING))
+    {
+        _backlight_set_brightness(--current_brightness);
+        return false;
+    }
+    else
+    {
+        /* decrement once more, since backlight is off */
+        current_brightness--;
+        _backlight_off();
+        return true;
+    }
+}
+
+bool _backlight_fade_step(int direction)
+{
+    bool done;
+    switch(direction)
+    {
+        case FADING_UP:
+            done = _backlight_fade_up();
+        break;
+        case FADING_DOWN:
+            done = _backlight_fade_down();
+        break;
+        default:
+            done = true;
+        break;
+    }
+    return(done);
+}