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NFC: extract frontend-facing tag state 

Added a new state amiibo_in_range. This state is akin to the real world
physical relationship between a 3DS machine and an amiibo, which is
independent from the service state (or even the machine is powered on or
not). The service state nfc_tag_state is then synchronized with this
physical state on every potential point when the state changes. This
solves the issue where user might load an amiibo before NFC service
initializes, or remove an amiibo after NFC service shutdown, which
previously causes inconsistent state change.

Also removed std::atomic on nfc_tag_state, because
1. It is already protected by g_hle_lock
2. It wasn't properly used in the code anyway. For example, there are
many double loading on this variable, which effectively make it
non-atomic.
This commit is contained in:
Weiyi Wang 2019-08-17 21:56:12 -04:00
parent 32b88d4719
commit 8b8111b425
2 changed files with 36 additions and 16 deletions
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46
src/core/hle/service/nfc/nfc.cpp
View File

@ -53,7 +53,7 @@ void Module::Interface::Initialize(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (nfc->nfc_tag_state != TagState::NotInitialized) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
return;
@ -99,13 +99,14 @@ void Module::Interface::StartTagScanning(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (nfc->nfc_tag_state != TagState::NotScanning &&
nfc->nfc_tag_state != TagState::TagOutOfRange) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
return;
}
nfc->nfc_tag_state = TagState::Scanning;
nfc->SyncTagState();
rb.Push(RESULT_SUCCESS);
LOG_WARNING(Service_NFC, "(STUBBED) called, in_val={:04x}", in_val);
@ -116,7 +117,7 @@ void Module::Interface::GetTagInfo(Kernel::HLERequestContext& ctx) {
if (nfc->nfc_tag_state != TagState::TagInRange &&
nfc->nfc_tag_state != TagState::TagDataLoaded && nfc->nfc_tag_state != TagState::Unknown6) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
@ -163,7 +164,7 @@ void Module::Interface::StopTagScanning(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (nfc->nfc_tag_state == TagState::NotInitialized ||
nfc->nfc_tag_state == TagState::NotScanning) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
return;
@ -192,13 +193,14 @@ void Module::Interface::ResetTagScanState(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (nfc->nfc_tag_state != TagState::TagDataLoaded && nfc->nfc_tag_state != TagState::Unknown6) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
return;
}
nfc->nfc_tag_state = TagState::TagInRange;
nfc->SyncTagState();
rb.Push(RESULT_SUCCESS);
LOG_DEBUG(Service_NFC, "called");
@ -208,7 +210,7 @@ void Module::Interface::GetTagInRangeEvent(Kernel::HLERequestContext& ctx) {
IPC::RequestParser rp(ctx, 0x0B, 0, 0);
if (nfc->nfc_tag_state != TagState::NotScanning) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
@ -225,7 +227,7 @@ void Module::Interface::GetTagOutOfRangeEvent(Kernel::HLERequestContext& ctx) {
IPC::RequestParser rp(ctx, 0x0C, 0, 0);
if (nfc->nfc_tag_state != TagState::NotScanning) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
@ -243,7 +245,7 @@ void Module::Interface::GetTagState(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
rb.Push(RESULT_SUCCESS);
rb.PushEnum(nfc->nfc_tag_state.load());
rb.PushEnum(nfc->nfc_tag_state);
LOG_DEBUG(Service_NFC, "called");
}
@ -261,7 +263,7 @@ void Module::Interface::Unknown0x1A(Kernel::HLERequestContext& ctx) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (nfc->nfc_tag_state != TagState::TagInRange) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
return;
@ -277,7 +279,7 @@ void Module::Interface::GetIdentificationBlock(Kernel::HLERequestContext& ctx) {
IPC::RequestParser rp(ctx, 0x1B, 0, 0);
if (nfc->nfc_tag_state != TagState::TagDataLoaded && nfc->nfc_tag_state != TagState::Unknown6) {
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state.load()));
LOG_ERROR(Service_NFC, "Invalid TagState {}", static_cast<int>(nfc->nfc_tag_state));
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(ResultCode(ErrCodes::CommandInvalidForState, ErrorModule::NFC,
ErrorSummary::InvalidState, ErrorLevel::Status));
@ -304,15 +306,29 @@ std::shared_ptr<Module> Module::Interface::GetModule() const {
void Module::Interface::LoadAmiibo(const AmiiboData& amiibo_data) {
std::lock_guard lock(HLE::g_hle_lock);
nfc->amiibo_data = amiibo_data;
nfc->nfc_tag_state = Service::NFC::TagState::TagInRange;
nfc->tag_in_range_event->Signal();
nfc->amiibo_in_range = true;
nfc->SyncTagState();
}
void Module::Interface::RemoveAmiibo() {
std::lock_guard lock(HLE::g_hle_lock);
nfc->nfc_tag_state = Service::NFC::TagState::TagOutOfRange;
nfc->tag_out_of_range_event->Signal();
nfc->amiibo_data = {};
nfc->amiibo_in_range = false;
nfc->SyncTagState();
}
void Module::SyncTagState() {
if (amiibo_in_range &&
(nfc_tag_state == TagState::TagOutOfRange || nfc_tag_state == TagState::Scanning)) {
// TODO (wwylele): Should TagOutOfRange->TagInRange transition only happen on the same tag
// detected on Scanning->TagInRange?
nfc_tag_state = TagState::TagInRange;
tag_in_range_event->Signal();
} else if (!amiibo_in_range && nfc_tag_state == TagState::TagInRange) {
nfc_tag_state = TagState::TagOutOfRange;
// TODO (wwylele): If a tag is removed during TagDataLoaded/Unknown6, should this event
// signals early?
tag_out_of_range_event->Signal();
}
}
Module::Interface::Interface(std::shared_ptr<Module> nfc, const char* name, u32 max_session)

6
src/core/hle/service/nfc/nfc.h
View File

@ -231,12 +231,16 @@ public:
};
private:
// Sync nfc_tag_state with amiibo_in_range and signal events on state change.
void SyncTagState();
std::shared_ptr<Kernel::Event> tag_in_range_event;
std::shared_ptr<Kernel::Event> tag_out_of_range_event;
std::atomic<TagState> nfc_tag_state = TagState::NotInitialized;
TagState nfc_tag_state = TagState::NotInitialized;
CommunicationStatus nfc_status = CommunicationStatus::NfcInitialized;
AmiiboData amiibo_data{};
bool amiibo_in_range = false;
};
void InstallInterfaces(Core::System& system);