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authorThomas Martitz <kugel@rockbox.org>2009-01-22 10:50:11 +0000
committerThomas Martitz <kugel@rockbox.org>2009-01-22 10:50:11 +0000
commit81df953da55e75632b5efbe676f2b348e11b2c4b (patch)
tree65bd98e7d86fb21310e26f87c30a9723a9b45894 /firmware/backlight-sw-fading.c
parent311d2f12ed024cf11971f23231e05a0143361115 (diff)
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Rename software backlight fading files, as we don't call it thread fading. Correct a copyright info too.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19818 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/backlight-sw-fading.c')
-rw-r--r--firmware/backlight-sw-fading.c87
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);
+}