mirror of
https://github.com/Atmosphere-NX/Atmosphere
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96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2019 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 "i2c_session.hpp"
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namespace ams::i2c::driver::impl {
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void Session::Open(Bus bus, u32 slave_address, AddressingMode addr_mode, SpeedMode speed_mode, BusAccessor *bus_accessor, u32 max_retries, u64 retry_wait_time) {
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std::scoped_lock lk(this->bus_accessor_mutex);
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if (!this->open) {
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this->bus_accessor = bus_accessor;
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this->bus = bus;
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this->slave_address = slave_address;
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this->addressing_mode = addr_mode;
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this->max_retries = max_retries;
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this->retry_wait_time = retry_wait_time;
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this->bus_accessor->Open(this->bus, speed_mode);
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this->open = true;
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}
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}
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void Session::Start() {
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std::scoped_lock lk(this->bus_accessor_mutex);
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if (this->open) {
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if (this->bus_accessor->GetOpenSessions() == 1) {
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this->bus_accessor->DoInitialConfig();
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}
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}
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}
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void Session::Close() {
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std::scoped_lock lk(this->bus_accessor_mutex);
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if (this->open) {
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this->bus_accessor->Close();
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this->bus_accessor = nullptr;
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this->open = false;
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}
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}
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bool Session::IsOpen() const {
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return this->open;
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}
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Result Session::DoTransaction(void *dst, const void *src, size_t num_bytes, I2cTransactionOption option, Command command) {
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std::scoped_lock lk(this->bus_accessor_mutex);
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R_UNLESS(!this->bus_accessor->GetBusy(), i2c::ResultBusBusy());
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this->bus_accessor->OnStartTransaction();
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ON_SCOPE_EXIT { this->bus_accessor->OnStopTransaction(); };
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R_TRY(this->bus_accessor->StartTransaction(command, this->addressing_mode, this->slave_address));
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switch (command) {
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case Command::Send:
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R_TRY(this->bus_accessor->Send(reinterpret_cast<const u8 *>(src), num_bytes, option, this->addressing_mode, this->slave_address));
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break;
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case Command::Receive:
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R_TRY(this->bus_accessor->Receive(reinterpret_cast<u8 *>(dst), num_bytes, option, this->addressing_mode, this->slave_address));
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break;
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AMS_UNREACHABLE_DEFAULT_CASE();
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}
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return ResultSuccess();
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}
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Result Session::DoTransactionWithRetry(void *dst, const void *src, size_t num_bytes, I2cTransactionOption option, Command command) {
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size_t i = 0;
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while (true) {
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R_TRY_CATCH(this->DoTransaction(dst, src, num_bytes, option, command)) {
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R_CATCH(i2c::ResultTimedOut) {
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if ((++i) <= this->max_retries) {
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svcSleepThread(this->retry_wait_time);
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continue;
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}
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return i2c::ResultBusBusy();
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}
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} R_END_TRY_CATCH;
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return ResultSuccess();
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}
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}
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}
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