git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/source/hid/hid_api.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+
+namespace ams::hid {
+
+    namespace {
+
+        /* Global lock. */
+        os::Mutex g_hid_lock;
+        bool g_initialized_hid = false;
+
+        /* Helper. */
+        void InitializeHid() {
+            R_ASSERT(smInitialize());
+            ON_SCOPE_EXIT { smExit(); };
+            {
+                R_ASSERT(hidInitialize());
+            }
+        }
+
+        Result EnsureHidInitialized() {
+            if (!g_initialized_hid) {
+                if (!serviceIsActive(hidGetServiceSession())) {
+                    if (!pm::info::HasLaunchedProgram(ncm::ProgramId::Hid)) {
+                        return MAKERESULT(Module_Libnx, LibnxError_InitFail_HID);
+                    }
+                    InitializeHid();
+                }
+                g_initialized_hid = true;
+            }
+
+            return ResultSuccess();
+        }
+
+    }
+
+    Result GetKeysHeld(u64 *out) {
+        std::scoped_lock lk(g_hid_lock);
+
+        R_TRY(EnsureHidInitialized());
+
+        hidScanInput();
+        *out = 0;
+
+        for (size_t controller = 0; controller < 10; controller++) {
+            *out |= hidKeysHeld(static_cast<HidControllerID>(controller));
+        }
+
+        return ResultSuccess();
+    }
+
+}