161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Copyright (c) 2023 Arunmani Alagarsamy
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* Author: Arunmani Alagarsamy <arunmani27100@gmail.com>
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*/
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/rtc.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/pm/device.h>
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#include <zephyr/sys/util.h>
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#define DT_DRV_COMPAT maxim_ds1307
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LOG_MODULE_REGISTER(ds1307, CONFIG_RTC_LOG_LEVEL);
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/* DS1307 registers */
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#define DS1307_REG_SECONDS 0x00
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#define DS1307_REG_MINUTES 0x01
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#define DS1307_REG_HOURS 0x02
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#define DS1307_REG_DAY 0x03
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#define DS1307_REG_DATE 0x04
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#define DS1307_REG_MONTH 0x05
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#define DS1307_REG_YEAR 0x06
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#define DS1307_REG_CTRL 0x07
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#define SECONDS_BITS GENMASK(6, 0)
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#define MINUTES_BITS GENMASK(7, 0)
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#define HOURS_BITS GENMASK(5, 0)
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#define DATE_BITS GENMASK(5, 0)
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#define MONTHS_BITS GENMASK(4, 0)
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#define WEEKDAY_BITS GENMASK(2, 0)
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#define YEAR_BITS GENMASK(7, 0)
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#define VALIDATE_24HR BIT(6)
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struct ds1307_config {
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struct i2c_dt_spec i2c_bus;
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};
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struct ds1307_data {
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struct k_spinlock lock;
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};
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static int ds1307_set_time(const struct device *dev, const struct rtc_time *tm)
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{
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int err;
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uint8_t regs[7];
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struct ds1307_data *data = dev->data;
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const struct ds1307_config *config = dev->config;
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k_spinlock_key_t key = k_spin_lock(&data->lock);
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LOG_DBG("set time: year = %d, mon = %d, mday = %d, wday = %d, hour = %d, "
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"min = %d, sec = %d",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min,
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tm->tm_sec);
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regs[0] = bin2bcd(tm->tm_sec) & SECONDS_BITS;
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regs[1] = bin2bcd(tm->tm_min);
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regs[2] = bin2bcd(tm->tm_hour);
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regs[3] = bin2bcd(tm->tm_wday);
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regs[4] = bin2bcd(tm->tm_mday);
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regs[5] = bin2bcd(tm->tm_mon);
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regs[6] = bin2bcd((tm->tm_year % 100));
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err = i2c_burst_write_dt(&config->i2c_bus, DS1307_REG_SECONDS, regs, sizeof(regs));
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k_spin_unlock(&data->lock, key);
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return err;
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}
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static int ds1307_get_time(const struct device *dev, struct rtc_time *timeptr)
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{
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int err;
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uint8_t regs[7];
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struct ds1307_data *data = dev->data;
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const struct ds1307_config *config = dev->config;
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k_spinlock_key_t key = k_spin_lock(&data->lock);
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err = i2c_burst_read_dt(&config->i2c_bus, DS1307_REG_SECONDS, regs, sizeof(regs));
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if (err != 0) {
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goto unlock;
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}
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timeptr->tm_sec = bcd2bin(regs[0] & SECONDS_BITS);
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timeptr->tm_min = bcd2bin(regs[1] & MINUTES_BITS);
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timeptr->tm_hour = bcd2bin(regs[2] & HOURS_BITS); /* 24hr mode */
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timeptr->tm_wday = bcd2bin(regs[3] & WEEKDAY_BITS);
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timeptr->tm_mday = bcd2bin(regs[4] & DATE_BITS);
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timeptr->tm_mon = bcd2bin(regs[5] & MONTHS_BITS);
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timeptr->tm_year = bcd2bin(regs[6] & YEAR_BITS);
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timeptr->tm_year = timeptr->tm_year + 100;
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/* Not used */
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timeptr->tm_nsec = 0;
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timeptr->tm_isdst = -1;
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timeptr->tm_yday = -1;
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/* Validate the chip in 24hr mode */
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if (regs[2] & VALIDATE_24HR) {
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err = -ENODATA;
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goto unlock;
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}
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LOG_DBG("get time: year = %d, mon = %d, mday = %d, wday = %d, hour = %d, "
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"min = %d, sec = %d",
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timeptr->tm_year, timeptr->tm_mon, timeptr->tm_mday, timeptr->tm_wday,
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timeptr->tm_hour, timeptr->tm_min, timeptr->tm_sec);
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unlock:
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k_spin_unlock(&data->lock, key);
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return err;
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}
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static const struct rtc_driver_api ds1307_driver_api = {
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.set_time = ds1307_set_time,
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.get_time = ds1307_get_time,
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};
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static int ds1307_init(const struct device *dev)
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{
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int err;
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const struct ds1307_config *config = dev->config;
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if (!i2c_is_ready_dt(&config->i2c_bus)) {
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LOG_ERR("I2C bus not ready");
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return -ENODEV;
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}
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/* Disable squarewave output */
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err = i2c_reg_write_byte_dt(&config->i2c_bus, DS1307_REG_CTRL, 0x00);
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if (err < 0) {
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LOG_ERR("Error: SQW:%d\n", err);
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}
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/* Make clock halt = 0 */
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err = i2c_reg_write_byte_dt(&config->i2c_bus, DS1307_REG_SECONDS, 0x00);
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if (err < 0) {
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LOG_ERR("Error: Set clock halt bit:%d\n", err);
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}
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return 0;
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}
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#define DS1307_DEFINE(inst) \
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static struct ds1307_data ds1307_data_##inst; \
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static const struct ds1307_config ds1307_config_##inst = { \
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.i2c_bus = I2C_DT_SPEC_INST_GET(inst), \
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}; \
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DEVICE_DT_INST_DEFINE(inst, &ds1307_init, NULL, &ds1307_data_##inst, \
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&ds1307_config_##inst, POST_KERNEL, CONFIG_RTC_INIT_PRIORITY, \
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&ds1307_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(DS1307_DEFINE)
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