// SPDX-License-Identifier: GPL-2.0-only /* * rtc-ds1390.c -- driver for the Dallas/Maxim DS1390/93/94 SPI RTC * * Copyright (C) 2008 Mercury IMC Ltd * Written by Mark Jackson <[email protected]> * * NOTE: Currently this driver only supports the bare minimum for read * and write the RTC. The extra features provided by the chip family * (alarms, trickle charger, different control registers) are unavailable. */ #include <linux/init.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/spi/spi.h> #include <linux/bcd.h> #include <linux/slab.h> #include <linux/of.h> #define DS1390_REG_100THS … #define DS1390_REG_SECONDS … #define DS1390_REG_MINUTES … #define DS1390_REG_HOURS … #define DS1390_REG_DAY … #define DS1390_REG_DATE … #define DS1390_REG_MONTH_CENT … #define DS1390_REG_YEAR … #define DS1390_REG_ALARM_100THS … #define DS1390_REG_ALARM_SECONDS … #define DS1390_REG_ALARM_MINUTES … #define DS1390_REG_ALARM_HOURS … #define DS1390_REG_ALARM_DAY_DATE … #define DS1390_REG_CONTROL … #define DS1390_REG_STATUS … #define DS1390_REG_TRICKLE … #define DS1390_TRICKLE_CHARGER_ENABLE … #define DS1390_TRICKLE_CHARGER_250_OHM … #define DS1390_TRICKLE_CHARGER_2K_OHM … #define DS1390_TRICKLE_CHARGER_4K_OHM … #define DS1390_TRICKLE_CHARGER_NO_DIODE … #define DS1390_TRICKLE_CHARGER_DIODE … struct ds1390 { … }; static void ds1390_set_reg(struct device *dev, unsigned char address, unsigned char data) { … } static int ds1390_get_reg(struct device *dev, unsigned char address, unsigned char *data) { … } static void ds1390_trickle_of_init(struct spi_device *spi) { … } static int ds1390_read_time(struct device *dev, struct rtc_time *dt) { … } static int ds1390_set_time(struct device *dev, struct rtc_time *dt) { … } static const struct rtc_class_ops ds1390_rtc_ops = …; static int ds1390_probe(struct spi_device *spi) { … } static const struct of_device_id ds1390_of_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, ds1390_of_match); static const struct spi_device_id ds1390_spi_ids[] = …; MODULE_DEVICE_TABLE(spi, ds1390_spi_ids); static struct spi_driver ds1390_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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