boot: finish implementing CheckBatteryCharge

stratosphere/boot/source/boot_battery_driver.cpp

@@ -307,3 +307,50 @@ Result BatteryDriver::IsBatteryRemoved(bool *out) {
     *out = (val & 0x0008) == 0x0008;
     return ResultSuccess;
 }
+
+Result BatteryDriver::GetTemperature(double *out) {
+    u16 val = 0;
+    Result rc = this->Read(Max17050Temperature, &val);
+    if (R_FAILED(rc)) {
+        return rc;
+    }
+    *out = static_cast<double>(val) * double(0.00390625);
+    return ResultSuccess;
+}
+
+Result BatteryDriver::GetAverageVCell(u32 *out) {
+    u16 val = 0;
+    Result rc = this->Read(Max17050AverageVCell, &val);
+    if (R_FAILED(rc)) {
+        return rc;
+    }
+    *out = (625 * u32(val >> 3)) / 1000;
+    return ResultSuccess;
+}
+
+Result BatteryDriver::GetSocRep(double *out) {
+    u16 val = 0;
+    Result rc = this->Read(Max17050SocRep, &val);
+    if (R_FAILED(rc)) {
+        return rc;
+    }
+    *out = static_cast<double>(val) * double(0.00390625);
+    return ResultSuccess;
+}
+
+Result BatteryDriver::GetBatteryPercentage(size_t *out) {
+    double raw_charge;
+    Result rc = this->GetSocRep(&raw_charge);
+    if (R_FAILED(rc)) {
+        return rc;
+    }
+    int converted_percentage = (((raw_charge - 3.93359375) * 98.0) / 94.2304688) + 2.0;
+    if (converted_percentage < 1) {
+        *out = 1;
+    } else if (converted_percentage > 100) {
+        *out = 100;
+    } else {
+        *out = static_cast<size_t>(converted_percentage);
+    }
+    return ResultSuccess;
+}

stratosphere/boot/source/boot_battery_driver.hpp

@@ -54,4 +54,8 @@ class BatteryDriver {
     public:
         Result InitializeBatteryParameters();
         Result IsBatteryRemoved(bool *out);
+        Result GetTemperature(double *out);
+        Result GetAverageVCell(u32 *out);
+        Result GetSocRep(double *out);
+        Result GetBatteryPercentage(size_t *out);
 };

stratosphere/boot/source/boot_check_battery.cpp

@@ -25,6 +25,197 @@ enum CheckBatteryResult {
     CheckBatteryResult_Reboot   = 2,
 };
 
+struct BatteryChargeParameters {
+    u32 temp_min;
+    u32 temp_low;
+    u32 temp_high;
+    u32 temp_max;
+    u32 allow_high_temp_charge_max_voltage;
+    u32 charge_voltage_limit_default;
+    u32 charge_voltage_limit_high_temp;
+    u32 allow_fast_charge_min_temp;
+    u32 allow_fast_charge_min_voltage;
+    u32 fast_charge_current_limit_default;
+    u32 fast_charge_current_limit_low_temp;
+    u32 fast_charge_current_limit_low_voltage;
+};
+
+static constexpr BatteryChargeParameters BatteryChargeParameters0 = {
+    .temp_min  = 4,
+    .temp_low  = 17,
+    .temp_high = 51,
+    .temp_max  = 60,
+    .allow_high_temp_charge_max_voltage = 4050,
+    .charge_voltage_limit_default       = 4208,
+    .charge_voltage_limit_high_temp     = 3952,
+    .allow_fast_charge_min_voltage          = 3320,
+    .fast_charge_current_limit_default      = 0x800,
+    .fast_charge_current_limit_low_temp     = 0x300,
+    .fast_charge_current_limit_low_voltage  = 0x200,
+};
+
+static constexpr BatteryChargeParameters BatteryChargeParameters1 = {
+    .temp_min  = 4,
+    .temp_low  = 17,
+    .temp_high = 51,
+    .temp_max  = 59,
+    .allow_high_temp_charge_max_voltage = 3984,
+    .charge_voltage_limit_default       = 4208,
+    .charge_voltage_limit_high_temp     = 3984,
+    .allow_fast_charge_min_voltage          = 0,
+    .fast_charge_current_limit_default      = 0x600,
+    .fast_charge_current_limit_low_temp     = 0x240,
+    .fast_charge_current_limit_low_voltage  = 0x600,
+};
+
+static constexpr BatteryChargeParameters BatteryChargeParameters2 = {
+    .temp_min  = 4,
+    .temp_low  = 17,
+    .temp_high = 51,
+    .temp_max  = 59,
+    .allow_high_temp_charge_max_voltage = 4080,
+    .charge_voltage_limit_default       = 4320,
+    .charge_voltage_limit_high_temp     = 4080,
+    .allow_fast_charge_min_voltage          = 0,
+    .fast_charge_current_limit_default      = 0x680,
+    .fast_charge_current_limit_low_temp     = 0x280,
+    .fast_charge_current_limit_low_voltage  = 0x680,
+};
+
+static const BatteryChargeParameters *GetBatteryChargeParameters(u32 battery_version) {
+    switch (battery_version) {
+        case 0:
+            return &BatteryChargeParameters0;
+        case 1:
+            return &BatteryChargeParameters1;
+        case 2:
+            return &BatteryChargeParameters2;
+        default:
+            std::abort();
+    }
+}
+
+static void UpdateCharger(PmicDriver *pmic_driver, ChargerDriver *charger_driver, BatteryDriver *battery_driver, const BatteryChargeParameters *params, u32 charge_voltage_limit) {
+    double temperature;
+    u32 battery_voltage;
+
+    if (R_FAILED(battery_driver->GetTemperature(&temperature)) || R_FAILED(battery_driver->GetAverageVCell(&battery_voltage))) {
+        pmic_driver->ShutdownSystem();
+    }
+
+    bool enable_charge = true;
+    if (temperature < double(params->temp_min)) {
+        enable_charge = false;
+    } else if (double(params->temp_high) <= temperature && temperature < double(params->temp_max)) {
+        if (battery_voltage < params->allow_high_temp_charge_max_voltage) {
+            charge_voltage_limit = std::min(charge_voltage_limit, params->charge_voltage_limit_high_temp);
+        } else {
+            enable_charge = false;
+        }
+    } else if (double(params->temp_max) <= temperature) {
+        enable_charge = false;
+        if (battery_voltage < params->allow_high_temp_charge_max_voltage) {
+            charge_voltage_limit = std::min(charge_voltage_limit, params->charge_voltage_limit_high_temp);
+        }
+    }
+
+    u32 fast_charge_current_limit = params->fast_charge_current_limit_default;
+    if (temperature < double(params->temp_low)) {
+        fast_charge_current_limit = std::min(fast_charge_current_limit, params->fast_charge_current_limit_low_temp);
+    }
+    if (battery_voltage < params->allow_fast_charge_min_voltage) {
+        fast_charge_current_limit = std::min(fast_charge_current_limit, params->fast_charge_current_limit_low_voltage);
+    }
+
+    if (R_FAILED(charger_driver->SetChargeEnabled(enable_charge))) {
+        pmic_driver->ShutdownSystem();
+    }
+    if (R_FAILED(charger_driver->SetChargeVoltageLimit(charge_voltage_limit))) {
+        pmic_driver->ShutdownSystem();
+    }
+    if (R_FAILED(charger_driver->SetFastChargeCurrentLimit(fast_charge_current_limit))) {
+        pmic_driver->ShutdownSystem();
+    }
+}
+
+static bool IsSufficientBattery(u32 battery_voltage, bool ac_ok) {
+    /* Nintendo has stuff for updating a static variable every 10 seconds here, but this seems, again, to be debug leftovers. */
+    const u32 required_voltage = ac_ok ? 4000 : 3650;
+    return battery_voltage >= required_voltage;
+}
+
+static CheckBatteryResult LoopCheckBattery(PmicDriver *pmic_driver, ChargerDriver *charger_driver, BatteryDriver *battery_driver, const BatteryChargeParameters *params, u32 charge_voltage_limit, bool reboot_on_power_button_pressed, bool succeed_on_sufficient_battery, bool shutdown_on_full_battery, bool can_show_battery_icon, bool can_show_charging_icon) {
+    bool is_showing_charging_icon = false;
+    ON_SCOPE_EXIT {
+        if (is_showing_charging_icon) {
+            Boot::EndShowChargingIcon();
+        }
+    };
+
+    if (can_show_charging_icon) {
+        size_t battery_percentage;
+        if (R_FAILED(battery_driver->GetBatteryPercentage(&battery_percentage))) {
+            return CheckBatteryResult_Shutdown;
+        }
+        Boot::StartShowChargingIcon(battery_percentage, true);
+        is_showing_charging_icon = true;
+    }
+
+    while (true) {
+        double battery_charge;
+        if (R_FAILED(battery_driver->GetSocRep(&battery_charge))) {
+            return CheckBatteryResult_Shutdown;
+        }
+        if (succeed_on_sufficient_battery && battery_charge >= 3.0) {
+            return CheckBatteryResult_Success;
+        } else if (shutdown_on_full_battery && battery_charge >= 99.0) {
+            return CheckBatteryResult_Shutdown;
+        } else {
+            /* Nintendo has logic for checking a value every 10 seconds. */
+            /* They never do anything with this value though, so it's probably just leftovers from debug? */
+        }
+
+        bool ac_ok;
+        if (R_FAILED(pmic_driver->GetAcOk(&ac_ok))) {
+            return CheckBatteryResult_Shutdown;
+        }
+
+        u32 battery_voltage;
+        if (R_FAILED(battery_driver->GetAverageVCell(&battery_voltage))) {
+            return CheckBatteryResult_Shutdown;
+        }
+
+        if (succeed_on_sufficient_battery && IsSufficientBattery(battery_voltage, ac_ok)) {
+            return CheckBatteryResult_Success;
+        }
+
+        if (!ac_ok) {
+            if (can_show_battery_icon && !is_showing_charging_icon) {
+                Boot::ShowLowBatteryIcon();
+            }
+            return CheckBatteryResult_Shutdown;
+        }
+
+        if (reboot_on_power_button_pressed) {
+            bool power_button_pressed;
+            if (R_FAILED(pmic_driver->GetPowerButtonPressed(&power_button_pressed))) {
+                return CheckBatteryResult_Shutdown;
+            }
+            if (power_button_pressed) {
+                return CheckBatteryResult_Reboot;
+            }
+        }
+
+        if (can_show_battery_icon && !is_showing_charging_icon) {
+            Boot::StartShowChargingIcon(1, false);
+            is_showing_charging_icon = true;
+        }
+
+        svcSleepThread(2'000'000'000ul);
+        UpdateCharger(pmic_driver, charger_driver, battery_driver, params, charge_voltage_limit);
+    }
+}
+
 void Boot::CheckBatteryCharge() {
     PmicDriver pmic_driver;
     BatteryDriver battery_driver;
@@ -51,11 +242,23 @@ void Boot::CheckBatteryCharge() {
         pmic_driver.ShutdownSystem();
     }
 
-    const u32 battery_version = Boot::GetBatteryVersion();
-
-    /* TODO: UpdateCharger(); */
-    /* TODO: LoopCheckBattery(); */
-    CheckBatteryResult check_result = CheckBatteryResult_Success;
+    const BatteryChargeParameters *params = GetBatteryChargeParameters(Boot::GetBatteryVersion());
+    u32 charge_voltage_limit = params->charge_voltage_limit_default;
+    CheckBatteryResult check_result;
+    if (boot_reason == 4) {
+        if (R_FAILED(charger_driver.GetChargeVoltageLimit(&charge_voltage_limit))) {
+            pmic_driver.ShutdownSystem();
+        }
+        UpdateCharger(&pmic_driver, &charger_driver, &battery_driver, params, charge_voltage_limit);
+        check_result = LoopCheckBattery(&pmic_driver, &charger_driver, &battery_driver, params, charge_voltage_limit, true, false, true, false, false);
+    } else {
+        UpdateCharger(&pmic_driver, &charger_driver, &battery_driver, params, charge_voltage_limit);
+        if (boot_reason == 1) {
+            check_result = LoopCheckBattery(&pmic_driver, &charger_driver, &battery_driver, params, charge_voltage_limit, true, true, false, true, true);
+        } else {
+            check_result = LoopCheckBattery(&pmic_driver, &charger_driver, &battery_driver, params, charge_voltage_limit, false, true, false, true, false);
+        }
+    }
 
     switch (check_result)   {
         case CheckBatteryResult_Success:

stratosphere/boot/source/boot_pmic_driver.cpp

@@ -57,6 +57,16 @@ Result PmicDriver::GetNvErc(u8 *out) {
     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) {
     /* TODO: Implement this. */
     std::abort();

stratosphere/boot/source/boot_pmic_driver.hpp

@@ -42,4 +42,5 @@ class PmicDriver {
         Result GetAcOk(bool *out);
         Result GetPowerIntr(u8 *out);
         Result GetNvErc(u8 *out);
+        Result GetPowerButtonPressed(bool *out);
 };