From 7c2a30c5b54e000106e466ba44fcc040746a0c90 Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Wed, 2 Jan 2013 03:20:47 -0500
Subject: Sleep when the lid is closed AND emulation is running. I don't know
 to what extent this will save on battery usage, though I do set the DSTWO's
 CPU to the lowest frequency while it sleeps.

---
 source/nds/entry.cpp | 21 ++++++++++++++-------
 source/nds/gui.c     |  2 +-
 source/nds/gui.h     |  2 ++
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index 8c5d8e4..9928985 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -126,16 +126,11 @@ bool8 S9xInitUpdate ()
 }
 
 
-
-bool frame_flip = 0;
-
 extern void NDSSFCDrawFrameAntialiased();
 	
 
 bool8 S9xDeinitUpdate (int Width, int Height, bool8 /*sixteen_bit*/)
 {
-	
-	
 	switch(game_config.graphic)
 	{
 		//Up
@@ -175,12 +170,12 @@ bool8 S9xDeinitUpdate (int Width, int Height, bool8 /*sixteen_bit*/)
 			break;
 	}
 
-    ds2_flipScreen(UP_SCREEN, UP_SCREEN_UPDATE_METHOD);
+	ds2_flipScreen(UP_SCREEN, UP_SCREEN_UPDATE_METHOD);
 	// A problem with update method 1 (wait, double buffer) means that, after
 	// about 15 minutes of play time, the screen starts to half-redraw every
 	// frame. With update method 0, this is mitigated. (Method 2 is too slow.)
 
-    return (TRUE);
+	return (TRUE);
 }
 
 void _makepath (char *path, const char *, const char *dir,
@@ -980,6 +975,18 @@ unsigned int S9xReadJoypad (int which1)
     struct key_buf inputdata;
 
 	ds2_getrawInput(&inputdata);
+
+	if (inputdata.key & KEY_LID)
+	{
+		ds2_setCPUclocklevel(0);
+		ds2_setSupend();
+		do {
+			ds2_getrawInput(&inputdata);
+		} while (inputdata.key & KEY_LID);
+		ds2_wakeup();
+		set_cpu_clock(clock_speed_number);
+	}
+
 	if(inputdata.key & KEY_TOUCH)	//Active menu
 		Settings.Paused = 1;
 
diff --git a/source/nds/gui.c b/source/nds/gui.c
index be44f9a..ed867b4 100644
--- a/source/nds/gui.c
+++ b/source/nds/gui.c
@@ -274,7 +274,7 @@ u32 game_enable_audio = 1;
 /******************************************************************************
  ******************************************************************************/
 static u32 menu_cheat_page = 0;
-static u32 clock_speed_number = 5;
+u32 clock_speed_number = 5;
 u32 gamepad_config_menu;
 
 /******************************************************************************
diff --git a/source/nds/gui.h b/source/nds/gui.h
index 9ebaf26..5a40979 100644
--- a/source/nds/gui.h
+++ b/source/nds/gui.h
@@ -97,6 +97,7 @@ extern char main_path[MAX_PATH];
 extern char rom_path[MAX_PATH];
 
 extern u32 game_enable_audio;
+extern u32 clock_speed_number;
 
 /******************************************************************************
  ******************************************************************************/
@@ -117,6 +118,7 @@ extern GAME_CONFIG	game_config;
 extern void gui_init(u32 lang_id);
 extern u32 menu(u16 *original_screen);
 extern void game_disableAudio();
+extern void set_cpu_clock(u32 num);
 
 #ifdef __cplusplus
 }
-- 
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