More GSPLCD functions

Implemented these using the information from 3D BREW. Did test to make sure they're working.

libctru/include/3ds/services/gsplcd.h

@@ -19,6 +19,12 @@ Result gspLcdInit(void);
 /// Exits GSPLCD.
 void gspLcdExit(void);
 
+/// Powers on both backlights.
+Result GSPLCD_PowerOnAllBacklights(void);
+
+/// Powers off both backlights.
+Result GSPLCD_PowerOffAllBacklights(void);
+
 /**
  * @brief Powers on the backlight.
  * @param screen Screen to power on.
@@ -31,6 +37,12 @@ Result GSPLCD_PowerOnBacklight(u32 screen);
  */
 Result GSPLCD_PowerOffBacklight(u32 screen);
 
+/**
+ * @brief Sets 3D_LEDSTATE to the input state value.
+ * @param state 0 = 3D LED enable, 1 = 3D LED disable.
+ */
+Result GSPLCD_SetLedForceOff(u8 state);
+
 /**
  * @brief Gets the LCD screens' vendors. Stubbed on old 3ds.
  * @param vendor Pointer to output the screen vendors to.

libctru/source/services/gsplcd.c

@@ -26,6 +26,30 @@ void gspLcdExit(void)
 	svcCloseHandle(gspLcdHandle);
 }
 
+Result GSPLCD_PowerOnAllBacklights(void)
+{
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x0F,0,0); // 0x0F0000
+
+	Result ret=0;
+	if (R_FAILED(ret = svcSendSyncRequest(gspLcdHandle))) return ret;
+
+	return cmdbuf[1];
+}
+
+Result GSPLCD_PowerOffAllBacklights(void)
+{
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x10,0,0); // 0x100000
+
+	Result ret=0;
+	if (R_FAILED(ret = svcSendSyncRequest(gspLcdHandle))) return ret;
+
+	return cmdbuf[1];
+}
+
 Result GSPLCD_PowerOnBacklight(u32 screen)
 {
 	u32 *cmdbuf = getThreadCommandBuffer();
@@ -52,6 +76,19 @@ Result GSPLCD_PowerOffBacklight(u32 screen)
 	return cmdbuf[1];
 }
 
+Result GSPLCD_SetLedForceOff(u8 state)
+{
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x13,1,0); // 0x130040
+	cmdbuf[1] = state;
+
+	Result ret=0;
+	if (R_FAILED(ret = svcSendSyncRequest(gspLcdHandle))) return ret;
+
+	return cmdbuf[1];
+}
+
 Result GSPLCD_GetVendors(u8 *vendors)
 {
 	u32 *cmdbuf = getThreadCommandBuffer();