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>

1 files changed, 5 insertions, 1 deletions

diff --git a/firmware/target/arm/imx233/sansa-fuzeplus/button-target.h b/firmware/target/arm/imx233/sansa-fuzeplus/button-target.h
index 1c94b76cdc..ce5ffe464a 100644
--- a/firmware/target/arm/imx233/sansa-fuzeplus/button-target.h
+++ b/firmware/target/arm/imx233/sansa-fuzeplus/button-target.h
@@ -24,7 +24,7 @@
 #include <stdbool.h>
 bool button_debug_screen(void);
 void touchpad_set_sensitivity(int level);
-void touchdev_enable(bool en);
+void touchpad_enable_device(bool en);
 
 /* Main unit's buttons */
 #define BUTTON_POWER                0x00000001
@@ -47,6 +47,10 @@ void touchdev_enable(bool en);
                      BUTTON_PLAYPAUSE|BUTTON_BACK| \
                      BUTTON_BOTTOMRIGHT|BUTTON_BOTTOMLEFT)
 
+#define BUTTON_TOUCHPAD (BUTTON_LEFT|BUTTON_UP|BUTTON_RIGHT|BUTTON_DOWN| \
+                         BUTTON_SELECT|BUTTON_PLAYPAUSE|BUTTON_BACK| \
+                         BUTTON_BOTTOMRIGHT|BUTTON_BOTTOMLEFT)
+
 /* Software power-off */
 #define POWEROFF_BUTTON BUTTON_POWER
 #define POWEROFF_COUNT 10