mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
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/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "impl/powctl_device_management.hpp"
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namespace ams::powctl {
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namespace {
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ddsf::AccessMode SanitizeAccessMode(ddsf::AccessMode access_mode) {
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switch (access_mode) {
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case ddsf::AccessMode_Read:
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case ddsf::AccessMode_Write:
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case ddsf::AccessMode_ReadWrite:
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case ddsf::AccessMode_WriteShared:
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case ddsf::AccessMode_ReadWriteShared:
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return access_mode;
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default:
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return ddsf::AccessMode_None;
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}
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}
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impl::SessionImpl &GetSessionImpl(Session &session) {
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return GetReference(session.impl_storage);
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}
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void DestroySession(Session &session) {
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GetSessionImpl(session).~SessionImpl();
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session.has_session = false;
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}
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void DestroySessionIfNecessary(Session &session) {
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if (session.has_session) {
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DestroySession(session);
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}
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}
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void CloseSessionIfOpen(Session &session) {
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if (session.has_session && GetSessionImpl(session).IsOpen()) {
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DestroySession(session);
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}
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}
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}
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Result OpenSession(Session *out, DeviceCode device_code, ddsf::AccessMode access_mode) {
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/* Validate input. */
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AMS_ASSERT(out != nullptr);
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access_mode = SanitizeAccessMode(access_mode);
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/* Find the target device. */
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impl::IDevice *device = nullptr;
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R_TRY(impl::FindDevice(std::addressof(device), device_code));
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/* Clean up the session if we have one. */
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DestroySessionIfNecessary(*out);
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/* Construct the session. */
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new (std::addressof(GetSessionImpl(*out))) impl::SessionImpl;
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auto guard = SCOPE_GUARD { DestroySessionIfNecessary(*out); };
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/* Try to open the session. */
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R_TRY(ddsf::OpenSession(device, std::addressof(GetSessionImpl(*out)), access_mode));
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/* We opened the session! */
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guard.Cancel();
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return ResultSuccess();
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}
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void CloseSession(Session &session) {
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/* This seems extremely unnecessary/duplicate, but it's what Nintendo does. */
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CloseSessionIfOpen(session);
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DestroySession(session);
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}
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}
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