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bdk: rtc: add auto dst support and fix an off-by-one

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CTCaer
2025-08-08 14:47:47 +03:00
parent aa65e368ba
commit 28594c8777
2 changed files with 30 additions and 12 deletions
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39
bdk/rtc/max77620-rtc.c
View File

@@ -1,7 +1,7 @@
/*
* PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
*
* Copyright (c) 2018-2022 CTCaer
* Copyright (c) 2018-2025 CTCaer
* Copyright (c) 2019 shchmue
*
* This program is free software; you can redistribute it and/or modify it
@@ -23,7 +23,8 @@
#include <soc/timer.h>
#include <soc/t210.h>
int epoch_offset = 0;
bool auto_dst = false;
int epoch_offset = 0;
void max77620_rtc_prep_read()
{
@@ -39,20 +40,24 @@ void max77620_rtc_get_time(rtc_time_t *time)
// Get control reg config.
val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_CONTROL_REG);
// TODO: Check for binary format also?
// TODO: Make also sure it's binary format?
// Get time.
time->sec = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_SEC_REG) & 0x7F;
time->min = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MIN_REG) & 0x7F;
u8 hour = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_HOUR_REG);
time->sec = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_SEC_REG) & 0x7F;
time->min = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MIN_REG) & 0x7F;
u8 hour = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_HOUR_REG) & 0x1F;
time->hour = hour & 0x1F;
if (!(val & MAX77620_RTC_24H) && (hour & MAX77620_RTC_HOUR_PM_MASK))
time->hour = (time->hour & 0xF) + 12;
if (!(val & MAX77620_RTC_24H))
{
time->hour = hour & 0xF;
if (hour & MAX77620_RTC_HOUR_PM_MASK)
time->hour += 12;
}
// Get day of week. 1: Monday to 7: Sunday.
time->weekday = 0;
val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_WEEKDAY_REG);
val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_WEEKDAY_REG) & 0x7F;
for (int i = 0; i < 8; i++)
{
time->weekday++;
@@ -62,8 +67,9 @@ void max77620_rtc_get_time(rtc_time_t *time)
}
// Get date.
time->day = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_DATE_REG) & 0x1f;
time->day = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_DAY_REG) & 0x1F;
time->month = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MONTH_REG) & 0xF) - 1;
time->month++; // Normally minus 1, but everything else expects 1 as January.
time->year = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_YEAR_REG) & 0x7F) + 2000;
}
@@ -126,7 +132,7 @@ void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time)
time->day = day;
// Set weekday.
time->weekday = 0; //! TODO.
time->weekday = (day + 4) % 7;
}
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time)
@@ -162,10 +168,21 @@ void max77620_rtc_get_time_adjusted(rtc_time_t *time)
if (epoch_offset)
{
u32 epoch = (u32)((s64)max77620_rtc_date_to_epoch(time) + epoch_offset);
// Adjust for DST between 28 march and 28 october. Good enough to cover all years as week info is not valid.
u16 md = (time->month << 8) | time->day;
if (auto_dst && md >= 0x31C && md < 0xA1C)
epoch += 3600;
max77620_rtc_epoch_to_date(epoch, time);
}
}
void max77620_rtc_set_auto_dst(bool enable)
{
auto_dst = enable;
}
void max77620_rtc_set_epoch_offset(int offset)
{
epoch_offset = offset;

3
bdk/rtc/max77620-rtc.h
View File

@@ -46,7 +46,7 @@
#define MAX77620_RTC_WEEKDAY_REG 0x0A
#define MAX77620_RTC_MONTH_REG 0x0B
#define MAX77620_RTC_YEAR_REG 0x0C
#define MAX77620_RTC_DATE_REG 0x0D
#define MAX77620_RTC_DAY_REG 0x0D
#define MAX77620_ALARM1_SEC_REG 0x0E
#define MAX77620_ALARM1_MIN_REG 0x0F
@@ -111,6 +111,7 @@ void max77620_rtc_prep_read();
void max77620_rtc_get_time(rtc_time_t *time);
void max77620_rtc_get_time_adjusted(rtc_time_t *time);
void max77620_rtc_set_epoch_offset(int offset);
void max77620_rtc_set_auto_dst(bool enable);
void max77620_rtc_stop_alarm();
void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time);
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time);