button: allow disabling software poweroff

On some devices, the button driver allows a "software poweroff" by long-
pressing a certain key. This behavior is inconvnient when that button needs
to be held down for other purposes, such as moving the cursor in rockpaint
or sgt-untangle.

This patch allows selectively disabling the software poweroff (enabled by
default) from both core and plugin code.

Change-Id: I7580752888ae5c7c7c5eb1be5966e3d67f17d4b4

2 files changed, 20 insertions, 1 deletions

diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index 9677580838..626afc415f 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -65,6 +65,9 @@ static bool phones_present = false;
 #ifdef HAVE_LINEOUT_DETECTION
 static bool lineout_present = false;
 #endif
+#ifdef HAVE_SW_POWEROFF
+static bool enable_sw_poweroff = true;
+#endif
 
 /* how long until repeat kicks in, in centiseconds */
 #define REPEAT_START      (30*HZ/100)
@@ -280,7 +283,8 @@ static void button_tick(void)
                            which doesn't shut down easily with the OFF
                            key */
 #ifdef HAVE_SW_POWEROFF
-                        if ((btn & POWEROFF_BUTTON
+                        if (enable_sw_poweroff &&
+                            (btn & POWEROFF_BUTTON
 #ifdef RC_POWEROFF_BUTTON
                                     || btn == RC_POWEROFF_BUTTON
 #endif
@@ -773,3 +777,13 @@ void button_enable_touch(bool en)
 #endif
 }
 #endif
+
+#ifdef HAVE_SW_POWEROFF
+void button_set_sw_poweroff_state(bool en) {
+    enable_sw_poweroff = en;
+}
+
+bool button_get_sw_poweroff_state() {
+    return enable_sw_poweroff;
+}
+#endif
diff --git a/firmware/export/button.h b/firmware/export/button.h
index d9732ebe8b..36b615f216 100644
--- a/firmware/export/button.h
+++ b/firmware/export/button.h
@@ -130,4 +130,9 @@ int touchscreen_last_touch(void);
 void button_enable_touch(bool en);
 #endif
 
+#ifdef HAVE_SW_POWEROFF
+void button_set_sw_poweroff_state(bool en);
+bool button_get_sw_poweroff_state(void);
+#endif
+
 #endif /* _BUTTON_H_ */