gpio: implement more of server library for boot sysmodule client usage

libraries/libvapours/include/vapours/results.hpp

@@ -33,6 +33,7 @@
 #include <vapours/results/err_results.hpp>
 #include <vapours/results/fatal_results.hpp>
 #include <vapours/results/fs_results.hpp>
+#include <vapours/results/gpio_results.hpp>
 #include <vapours/results/hipc_results.hpp>
 #include <vapours/results/i2c_results.hpp>
 #include <vapours/results/kvdb_results.hpp>

libraries/libvapours/include/vapours/results/gpio_results.hpp

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018-2020 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/>.
+ */
+
+#pragma once
+#include <vapours/results/results_common.hpp>
+
+namespace ams::gpio {
+
+    R_DEFINE_NAMESPACE_RESULT_MODULE(102);
+
+    R_DEFINE_ERROR_RESULT(AlreadyBound,    1);
+    R_DEFINE_ERROR_RESULT(AlreadyOpen,     2);
+    R_DEFINE_ERROR_RESULT(DeviceNotFound,  3);
+    R_DEFINE_ERROR_RESULT(InvalidArgument, 4);
+
+}