Atmosphere/stratosphere/boot/source/i2c_driver/i2c_driver_session.cpp
2019-06-20 00:57:17 -07:00

99 lines
3.4 KiB
C++

/*
* Copyright (c) 2018-2019 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 <switch.h>
#include <stratosphere.hpp>
#include "i2c_driver_session.hpp"
void I2cDriverSession::Open(I2cBus bus, u32 slave_address, AddressingMode addr_mode, SpeedMode speed_mode, I2cBusAccessor *bus_accessor, u32 max_retries, u64 retry_wait_time){
std::scoped_lock<HosMutex> lk(this->bus_accessor_mutex);
if (!this->open) {
this->bus_accessor = bus_accessor;
this->bus = bus;
this->slave_address = slave_address;
this->addressing_mode = addr_mode;
this->max_retries = max_retries;
this->retry_wait_time = retry_wait_time;
this->bus_accessor->Open(this->bus, speed_mode);
this->open = true;
}
}
void I2cDriverSession::Start(){
std::scoped_lock<HosMutex> lk(this->bus_accessor_mutex);
if (this->open) {
if (this->bus_accessor->GetOpenSessions() == 1) {
this->bus_accessor->DoInitialConfig();
}
}
}
void I2cDriverSession::Close(){
std::scoped_lock<HosMutex> lk(this->bus_accessor_mutex);
if (this->open) {
this->bus_accessor->Close();
this->bus_accessor = nullptr;
this->open = false;
}
}
bool I2cDriverSession::IsOpen() const{
return this->open;
}
Result I2cDriverSession::DoTransaction(void *dst, const void *src, size_t num_bytes, I2cTransactionOption option, DriverCommand command){
std::scoped_lock<HosMutex> lk(this->bus_accessor_mutex);
if (this->bus_accessor->GetBusy()) {
return ResultI2cBusBusy;
}
this->bus_accessor->OnStartTransaction();
ON_SCOPE_EXIT { this->bus_accessor->OnStopTransaction(); };
R_TRY(this->bus_accessor->StartTransaction(command, this->addressing_mode, this->slave_address));
switch (command) {
case DriverCommand_Send:
R_TRY(this->bus_accessor->Send(reinterpret_cast<const u8 *>(src), num_bytes, option, this->addressing_mode, this->slave_address));
break;
case DriverCommand_Receive:
R_TRY(this->bus_accessor->Receive(reinterpret_cast<u8 *>(dst), num_bytes, option, this->addressing_mode, this->slave_address));
break;
default:
std::abort();
}
return ResultSuccess;
}
Result I2cDriverSession::DoTransactionWithRetry(void *dst, const void *src, size_t num_bytes, I2cTransactionOption option, DriverCommand command){
size_t i = 0;
while (true) {
R_TRY_CATCH(this->DoTransaction(dst, src, num_bytes, option, command)) {
R_CATCH(ResultI2cTimedOut) {
i++;
if (i <= this->max_retries) {
svcSleepThread(this->retry_wait_time);
continue;
}
return ResultI2cBusBusy;
}
} R_END_TRY_CATCH;
return ResultSuccess;
}
}