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, 25 insertions, 0 deletions

diff --git a/apps/plugins/lib/helper.c b/apps/plugins/lib/helper.c
index 5aa143a728..506903e808 100644
--- a/apps/plugins/lib/helper.c
+++ b/apps/plugins/lib/helper.c
@@ -66,6 +66,21 @@ void backlight_use_settings(void)
 #endif /* CONFIG_CHARGING */
 }
 
+#ifdef HAVE_SW_POWEROFF
+static bool original_sw_poweroff_state = true;
+
+void sw_poweroff_disable(void)
+{
+    original_sw_poweroff_state = rb->button_get_sw_poweroff_state();
+    rb->button_set_sw_poweroff_state(false);
+}
+
+void sw_poweroff_restore(void)
+{
+    rb->button_set_sw_poweroff_state(original_sw_poweroff_state);
+}
+#endif
+
 #ifdef HAVE_REMOTE_LCD
 /*  Force the backlight on */
 void remote_backlight_force_on(void)
diff --git a/apps/plugins/lib/helper.h b/apps/plugins/lib/helper.h
index 8086cb52d4..f2e9187a96 100644
--- a/apps/plugins/lib/helper.h
+++ b/apps/plugins/lib/helper.h
@@ -29,6 +29,16 @@
 void backlight_force_on(void);
 void backlight_ignore_timeout(void);
 void backlight_use_settings(void);
+
+#ifdef HAVE_SW_POWEROFF
+/**
+ * Disable and restore software poweroff (i.e. holding PLAY on iPods).
+ * Only call _restore() if _disable() was called earlier!
+ */
+void sw_poweroff_disable(void);
+void sw_poweroff_restore(void);
+#endif
+
 #ifdef HAVE_REMOTE_LCD
 void remote_backlight_force_on(void);
 void remote_backlight_ignore_timeout(void);