Add lblSwitchBacklightOn and lblSwitchBacklightOff

nx/include/switch.h

@@ -50,6 +50,7 @@ extern "C" {
 #include "switch/services/auddev.h"
 #include "switch/services/hwopus.h"
 #include "switch/services/csrng.h"
+#include "switch/services/lbl.h"
 #include "switch/services/bpc.h"
 #include "switch/services/pcv.h"
 #include "switch/services/psm.h"

nx/include/switch/services/lbl.h

@@ -0,0 +1,14 @@
+/**
+ * @file lbl.h
+ * @brief LBL service IPC wrapper.
+ * @author SciresM
+ * @copyright libnx Authors
+ */
+#pragma once
+#include "../types.h"
+
+Result lblInitialize(void);
+void lblExit(void);
+
+Result lblSwitchBacklightOn(u64 fade_time);
+Result lblSwitchBacklightOff(u64 fade_time);

nx/source/services/lbl.c

@@ -0,0 +1,73 @@
+#include "types.h"
+#include "result.h"
+#include "arm/atomics.h"
+#include "kernel/ipc.h"
+#include "kernel/detect.h"
+#include "services/lbl.h"
+#include "services/sm.h"
+
+static Service g_lblSrv;
+static u64 g_refCnt;
+
+Result lblInitialize(void) {
+    Result rc = 0;
+    
+    atomicIncrement64(&g_refCnt);
+
+    if (serviceIsActive(&g_lblSrv))
+        return 0;
+
+    rc = smGetService(&g_lblSrv, "lbl");
+
+    if (R_FAILED(rc)) lblExit();
+
+    return rc;
+}
+
+void lblExit(void) {
+    if (atomicDecrement64(&g_refCnt) == 0) {
+        serviceClose(&g_lblSrv);
+    }
+}
+
+static Result _lblSwitchBacklight(u32 cmd_id, u64 fade_time) {
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+        u64 fade_time;
+    } *raw;
+
+    raw = serviceIpcPrepareHeader(&g_lblSrv, &c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = cmd_id;
+    raw->fade_time = fade_time;
+
+    Result rc = serviceIpcDispatch(&g_lblSrv);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp;
+
+        serviceIpcParse(&g_lblSrv, &r, sizeof(*resp));
+        resp = r.Raw;
+
+        rc = resp->result;
+    }
+
+    return rc;
+}
+
+Result lblSwitchBacklightOn(u64 fade_time) {
+    return _lblSwitchBacklight(6, fade_time);
+}
+
+Result lblSwitchBacklightOff(u64 fade_time) {
+    return _lblSwitchBacklight(7, fade_time);
+}