/*
 * 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 "boot_functions.hpp"
#include "boot_pmic_driver.hpp"

void PmicDriver::ShutdownSystem() {
    if (R_FAILED(this->ShutdownSystem(false))) {
        std::abort();
    }
}

void PmicDriver::RebootSystem() {
    if (R_FAILED(this->ShutdownSystem(true))) {
        std::abort();
    }
}

Result PmicDriver::GetAcOk(bool *out) {
    u8 power_status;
    Result rc = this->GetPowerStatus(&power_status);
    if (R_FAILED(rc)) {
        return rc;
    }

    *out = (power_status & 0x02) != 0;
    return ResultSuccess;
}

Result PmicDriver::GetPowerIntr(u8 *out) {
    const u8 addr = 0x0B;
    return Boot::ReadI2cRegister(this->i2c_session, out, sizeof(*out), &addr, sizeof(addr));
}

Result PmicDriver::GetPowerStatus(u8 *out) {
    const u8 addr = 0x15;
    return Boot::ReadI2cRegister(this->i2c_session, out, sizeof(*out), &addr, sizeof(addr));
}

Result PmicDriver::GetNvErc(u8 *out) {
    const u8 addr = 0x0C;
    return Boot::ReadI2cRegister(this->i2c_session, out, sizeof(*out), &addr, sizeof(addr));
}

Result PmicDriver::GetPowerButtonPressed(bool *out) {
    u8 power_intr;
    Result rc = this->GetPowerIntr(&power_intr);
    if (R_FAILED(rc)) {
        return rc;
    }
    *out = (power_intr & 0x08) != 0;
    return ResultSuccess;
}

Result PmicDriver::ShutdownSystem(bool reboot) {
    const u8 on_off_1_addr = 0x41;
    const u8 on_off_2_addr = 0x42;

    /* Get value, set or clear software reset mask. */
    u8 on_off_2_val = 0;
    if (R_FAILED(Boot::ReadI2cRegister(this->i2c_session, &on_off_2_val, sizeof(on_off_2_val), &on_off_2_addr, sizeof(on_off_2_addr)))) {
        std::abort();
    }
    if (reboot) {
        on_off_2_val |= 0x80;
    } else {
        on_off_2_val &= ~0x80;
    }
    if (R_FAILED(Boot::WriteI2cRegister(this->i2c_session, &on_off_2_val, sizeof(on_off_2_val), &on_off_2_addr, sizeof(on_off_2_addr)))) {
        std::abort();
    }

    /* Get value, set software reset mask. */
    u8 on_off_1_val = 0;
    if (R_FAILED(Boot::ReadI2cRegister(this->i2c_session, &on_off_1_val, sizeof(on_off_1_val), &on_off_1_addr, sizeof(on_off_1_addr)))) {
        std::abort();
    }
    on_off_1_val |= 0x80;

    /* Finalize the battery. */
    {
        BatteryDriver battery_driver;
        this->FinalizeBattery(&battery_driver);
    }

    /* Actually write the value to trigger shutdown/reset. */
    if (R_FAILED(Boot::WriteI2cRegister(this->i2c_session, &on_off_1_val, sizeof(on_off_1_val), &on_off_1_addr, sizeof(on_off_1_addr)))) {
        std::abort();
    }

    /* Allow up to 5 seconds for shutdown/reboot to take place. */
    svcSleepThread(5'000'000'000ul);
    std::abort();
}

void PmicDriver::FinalizeBattery(BatteryDriver *battery_driver) {
    /* Set shutdown timer. */
    battery_driver->SetShutdownTimer();

    /* Get whether shutdown is enabled. */
    bool shutdown_enabled;
    if (R_FAILED(battery_driver->GetShutdownEnabled(&shutdown_enabled))) {
        return;
    }

    bool ac_ok;
    bool desired_shutdown_enabled;
    if (R_FAILED(this->GetAcOk(&ac_ok)) || ac_ok) {
        desired_shutdown_enabled = false;
    } else {
        desired_shutdown_enabled = true;
    }

    if (shutdown_enabled != desired_shutdown_enabled) {
        battery_driver->SetShutdownEnabled(desired_shutdown_enabled);
    }
}
