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Atmosphere/libraries/libstratosphere/source/i2c/i2c_client_api.cpp

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/*
* 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/>.
*/
#include <stratosphere.hpp>
namespace ams::i2c {
namespace {
constinit os::SdkMutex g_init_mutex;
constinit int g_initialize_count = 0;
constinit os::SdkMutex g_i2c_mutex;
ams::sf::SharedPointer<sf::IManager> g_i2c_manager;
constinit int g_i2c_count = 0;
constinit os::SdkMutex g_i2c_pcv_mutex;
ams::sf::SharedPointer<sf::IManager> g_i2c_pcv_manager;
constinit int g_i2c_pcv_count = 0;
i2c::sf::ISession *GetInterface(const I2cSession &session) {
AMS_ASSERT(session._session != nullptr);
return static_cast<i2c::sf::ISession *>(session._session);
}
ams::sf::SharedPointer<sf::IManager> GetManager(DeviceCode device_code) {
if (IsPowerBusDeviceCode(device_code)) {
return g_i2c_pcv_manager;
} else {
return g_i2c_manager;
}
}
}
void InitializeWith(ams::sf::SharedPointer<i2c::sf::IManager> sp, ams::sf::SharedPointer<i2c::sf::IManager> sp_pcv) {
std::scoped_lock lk(g_init_mutex);
AMS_ABORT_UNLESS(g_initialize_count == 0);
{
std::scoped_lock lk(g_i2c_mutex);
g_i2c_manager = std::move(sp);
AMS_ABORT_UNLESS(g_i2c_count == 0);
g_i2c_count = 1;
}
{
std::scoped_lock lk(g_i2c_pcv_mutex);
g_i2c_pcv_manager = std::move(sp);
AMS_ABORT_UNLESS(g_i2c_pcv_count == 0);
g_i2c_pcv_count = 1;
}
g_initialize_count = 1;
}
void InitializeEmpty() {
std::scoped_lock lk(g_init_mutex);
++g_initialize_count;
}
void Finalize() {
std::scoped_lock lk(g_init_mutex);
AMS_ASSERT(g_initialize_count > 0);
if ((--g_initialize_count) == 0) {
{
std::scoped_lock lk(g_i2c_mutex);
AMS_ASSERT(g_i2c_count > 0);
if (g_i2c_count > 0) {
if ((--g_i2c_count) == 0) {
g_i2c_manager = nullptr;
}
}
}
{
std::scoped_lock lk(g_i2c_pcv_mutex);
AMS_ASSERT(g_i2c_pcv_count > 0);
if (g_i2c_pcv_count > 0) {
if ((--g_i2c_pcv_count) == 0) {
g_i2c_manager = nullptr;
}
}
}
}
}
Result OpenSession(I2cSession *out, DeviceCode device_code) {
/* Get manager for the device. */
auto manager = GetManager(device_code);
/* Get the session. */
ams::sf::SharedPointer<i2c::sf::ISession> session;
{
if (hos::GetVersion() >= hos::Version_6_0_0) {
R_TRY(manager->OpenSession2(std::addressof(session), device_code));
} else {
R_TRY(manager->OpenSession(std::addressof(session), ConvertToI2cDevice(device_code)));
}
}
/* Set output. */
out->_session = session.Detach();
/* We succeeded. */
return ResultSuccess();
}
void CloseSession(I2cSession &session) {
/* Close the session. */
ams::sf::ReleaseSharedObject(GetInterface(session));
session._session = nullptr;
}
Result Send(const I2cSession &session, const void *src, size_t src_size, TransactionOption option) {
const ams::sf::InAutoSelectBuffer buf(src, src_size);
return GetInterface(session)->Send(buf, option);
}
Result Receive(void *dst, size_t dst_size, const I2cSession &session, TransactionOption option) {
const ams::sf::OutAutoSelectBuffer buf(dst, dst_size);
return GetInterface(session)->Receive(buf, option);
}
Result ExecuteCommandList(void *dst, size_t dst_size, const I2cSession &session, const void *src, size_t src_size) {
const ams::sf::OutAutoSelectBuffer buf(dst, dst_size);
const ams::sf::InPointerArray<i2c::I2cCommand> arr(static_cast<const i2c::I2cCommand *>(src), src_size);
return GetInterface(session)->ExecuteCommandList(buf, arr);
}
void SetRetryPolicy(const I2cSession &session, int max_retry_count, int retry_interval_us) {
AMS_ASSERT(max_retry_count >= 0);
AMS_ASSERT(retry_interval_us >= 0);
R_ABORT_UNLESS(GetInterface(session)->SetRetryPolicy(max_retry_count, retry_interval_us));
}
}