Atmosphere/stratosphere/boot/source/i2c_driver/i2c_resource_manager.hpp
2019-05-02 07:18:05 -07:00

78 lines
2.5 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/>.
*/
#pragma once
#include <switch.h>
#include <stratosphere.hpp>
#include "i2c_types.hpp"
#include "i2c_bus_accessor.hpp"
#include "i2c_driver_session.hpp"
class I2cResourceManager {
public:
static constexpr size_t MaxDriverSessions = 40;
static constexpr size_t MaxBuses = 6;
static constexpr size_t PowerBusId = static_cast<size_t>(I2cBus_I2c5);
static constexpr size_t InvalidSessionId = static_cast<size_t>(-1);
private:
HosMutex initialize_mutex;
HosMutex session_open_mutex;
size_t ref_cnt = 0;
bool suspended = false;
bool power_bus_suspended = false;
I2cDriverSession sessions[MaxDriverSessions];
I2cBusAccessor bus_accessors[MaxBuses];
HosMutex transaction_mutexes[MaxBuses];
public:
I2cResourceManager() {
/* ... */
}
private:
size_t GetFreeSessionId() const;
public:
/* N uses a singleton here, we'll oblige. */
static I2cResourceManager &GetInstance() {
static I2cResourceManager s_instance;
return s_instance;
}
bool IsInitialized() const {
return this->ref_cnt > 0;
}
I2cDriverSession& GetSession(size_t id) {
return this->sessions[id];
}
HosMutex& GetTransactionMutex(I2cBus bus) {
if (bus >= MaxBuses) {
std::abort();
}
return this->transaction_mutexes[bus];
}
void Initialize();
void Finalize();
void OpenSession(I2cSessionImpl *out_session, I2cBus bus, u32 slave_address, AddressingMode addressing_mode, SpeedMode speed_mode, u32 max_retries, u64 retry_wait_time);
void CloseSession(const I2cSessionImpl &session);
void SuspendBuses();
void ResumeBuses();
void SuspendPowerBus();
void ResumePowerBus();
};