touch devices: Disable touch on softlock.

Target that have a touchpad/touchscreen should disable it while
being locked (In order to avoid LCD to drain battery power due to
"key locked" constant reporting messages. If they a have a keylock
button this was already handled at driver level. If not (e.g. fuze+),
they will have to implement a switch at driver level that action.c
can operate on softlock.
This patch does the following for any target having a touchpad
or a touchscreen and no HAS_BUTTON_HOLD (ie any softlock target)
1) it implements the code to call button_enable_touch(bool en) in
action.c.
2) button_enable_touch is implemented in button.c and call
either touchpad_enable or touchscreen_enable
3) those two function are implemented respectively in touchscreen.c
and a new touchpad.c file. They provide a generic way to silents touch's
device and call a function at driver level where target specific code
can be implemented if possible/needed (for power saving for instance).
Those function name are touchpad_enable_device and touchscreen_enable_device
4) we implement an empty function at driver level of targets that need it
to have them still being able to compiled.

Change-Id: I9ead78a25bd33466a8533f5b9f259b395cb5ce49
Reviewed-on: http://gerrit.rockbox.org/569
Reviewed-by: Thomas Martitz <kugel@rockbox.org>
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>

3 files changed, 39 insertions, 0 deletions

diff --git a/firmware/export/button.h b/firmware/export/button.h
index 6276a033cc..7109c00f97 100644
--- a/firmware/export/button.h
+++ b/firmware/export/button.h
@@ -119,4 +119,12 @@ int touchscreen_last_touch(void);
 #include "touchscreen.h"
 #endif
 
+#ifdef HAVE_TOUCHPAD
+#include "touchpad.h"
+#endif
+
+#if (defined(HAVE_TOUCHPAD) || defined(HAVE_TOUCHSCREEN)) && !defined(HAS_BUTTON_HOLD)
+void button_enable_touch(bool en);
+#endif
+
 #endif /* _BUTTON_H_ */
diff --git a/firmware/export/touchpad.h b/firmware/export/touchpad.h
new file mode 100644
index 0000000000..ad08469459
--- /dev/null
+++ b/firmware/export/touchpad.h
@@ -0,0 +1,28 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2013 by Jean-Louis Biasini
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef _TOUCHDEV_H_
+#define _TOUCHDEV_H_
+
+void touchpad_enable(bool en);
+int touchpad_filter(int button);
+
+#endif /* _TOUCHDEV_H_ */
diff --git a/firmware/export/touchscreen.h b/firmware/export/touchscreen.h
index a27e60c653..7421fe0b33 100644
--- a/firmware/export/touchscreen.h
+++ b/firmware/export/touchscreen.h
@@ -51,5 +51,8 @@ enum touchscreen_mode touchscreen_get_mode(void);
 void touchscreen_disable_mapping(void);
 void touchscreen_reset_mapping(void);
 int touchscreen_get_scroll_threshold(void);
+void touchscreen_enable(bool en);
+void touchscreen_enable_device(bool en);
+bool touchscreen_is_enabled(void);
 
 #endif /* __TOUCHSCREEN_INCLUDE_H_ */