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147 lines
4 KiB
C
147 lines
4 KiB
C
/*
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* PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
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*
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* Copyright (c) 2018-2019 CTCaer
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* Copyright (c) 2019 shchmue
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <rtc/max77620-rtc.h>
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#include <soc/i2c.h>
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#include <utils/util.h>
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void max77620_rtc_get_time(rtc_time_t *time)
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{
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u8 val = 0;
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// Update RTC regs from RTC clock.
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i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_READ_UPDATE);
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// Get control reg config.
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val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_CONTROL_REG);
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// TODO: Check for binary format also?
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// Get time.
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time->sec = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_SEC_REG) & 0x7F;
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time->min = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MIN_REG) & 0x7F;
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u8 hour = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_HOUR_REG);
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time->hour = hour & 0x1F;
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if (!(val & MAX77620_RTC_24H) && (hour & MAX77620_RTC_HOUR_PM_MASK))
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time->hour = (time->hour & 0xF) + 12;
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// Get day of week. 1: Monday to 7: Sunday.
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time->weekday = 0;
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val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_WEEKDAY_REG);
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for (int i = 0; i < 8; i++)
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{
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time->weekday++;
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if (val & 1)
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break;
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val >>= 1;
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}
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// Get date.
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time->day = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_DATE_REG) & 0x1f;
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time->month = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MONTH_REG) & 0xF) - 1;
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time->year = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_YEAR_REG) & 0x7F) + 2000;
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}
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void max77620_rtc_stop_alarm()
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{
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u8 val = 0;
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// Update RTC regs from RTC clock.
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i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_READ_UPDATE);
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// Stop alarm for both ALARM1 and ALARM2. Horizon uses ALARM2.
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for (int i = 0; i < (MAX77620_RTC_NR_TIME_REGS * 2); i++)
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{
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val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_ALARM1_SEC_REG + i);
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val &= ~MAX77620_RTC_ALARM_EN_MASK;
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i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_ALARM1_SEC_REG + i, val);
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}
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// Update RTC clock from RTC regs.
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i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_WRITE_UPDATE);
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}
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void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time)
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{
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u32 tmp, edays, year, month, day;
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// Set time.
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time->sec = epoch % 60;
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epoch /= 60;
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time->min = epoch % 60;
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epoch /= 60;
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time->hour = epoch % 24;
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epoch /= 24;
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// Calculate base date values.
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tmp = (u32)(((u64)4 * epoch + 102032) / 146097 + 15);
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tmp = (u32)((u64)epoch + 2442113 + tmp - (tmp >> 2));
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year = (20 * tmp - 2442) / 7305;
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edays = tmp - 365 * year - (year >> 2);
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month = edays * 1000 / 30601;
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day = edays - month * 30 - month * 601 / 1000;
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// Month/Year offset.
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if(month < 14)
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{
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year -= 4716;
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month--;
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}
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else
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{
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year -= 4715;
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month -= 13;
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}
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// Set date.
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time->year = year;
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time->month = month;
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time->day = day;
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// Set weekday.
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time->weekday = 0; //! TODO.
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}
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u32 max77620_rtc_date_to_epoch(const rtc_time_t *time)
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{
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u32 year, month, epoch;
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//Year
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year = time->year;
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//Month of year
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month = time->month;
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// Month/Year offset.
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if(month < 3)
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{
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month += 12;
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year--;
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}
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epoch = (365 * year) + (year >> 2) - (year / 100) + (year / 400); // Years to days.
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epoch += (30 * month) + (3 * (month + 1) / 5) + time->day; // Months to days.
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epoch -= 719561; // Epoch time is 1/1/1970.
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epoch *= 86400; // Days to seconds.
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epoch += (3600 * time->hour) + (60 * time->min) + time->sec; // Add hours, minutes and seconds.
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return epoch;
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}
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