/* * drivers/rtc/rtc-pcf85363.c * * Driver for NXP PCF85363 real-time clock. * * Copyright (C) 2017 Eric Nelson * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert */ #include #include #include #include #include #include #include #include #include #include #include /* * Date/Time registers */ #define DT_100THS 0x00 #define DT_SECS 0x01 #define DT_MINUTES 0x02 #define DT_HOURS 0x03 #define DT_DAYS 0x04 #define DT_WEEKDAYS 0x05 #define DT_MONTHS 0x06 #define DT_YEARS 0x07 /* * Alarm registers */ #define DT_SECOND_ALM1 0x08 #define DT_MINUTE_ALM1 0x09 #define DT_HOUR_ALM1 0x0a #define DT_DAY_ALM1 0x0b #define DT_MONTH_ALM1 0x0c #define DT_MINUTE_ALM2 0x0d #define DT_HOUR_ALM2 0x0e #define DT_WEEKDAY_ALM2 0x0f #define DT_ALARM_EN 0x10 /* * Time stamp registers */ #define DT_TIMESTAMP1 0x11 #define DT_TIMESTAMP2 0x17 #define DT_TIMESTAMP3 0x1d #define DT_TS_MODE 0x23 /* * control registers */ #define CTRL_OFFSET 0x24 #define CTRL_OSCILLATOR 0x25 #define CTRL_BATTERY 0x26 #define CTRL_PIN_IO 0x27 #define CTRL_FUNCTION 0x28 #define CTRL_INTA_EN 0x29 #define CTRL_INTB_EN 0x2a #define CTRL_FLAGS 0x2b #define CTRL_RAMBYTE 0x2c #define CTRL_WDOG 0x2d #define CTRL_STOP_EN 0x2e #define CTRL_RESETS 0x2f #define CTRL_RAM 0x40 #define NVRAM_SIZE 0x40 static struct i2c_driver pcf85363_driver; struct pcf85363 { struct device *dev; struct rtc_device *rtc; struct regmap *regmap; }; static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct pcf85363 *pcf85363 = dev_get_drvdata(dev); unsigned char buf[DT_YEARS + 1]; int ret, len = sizeof(buf); /* read the RTC date and time registers all at once */ ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len); if (ret) { dev_err(dev, "%s: error %d\n", __func__, ret); return ret; } tm->tm_year = bcd2bin(buf[DT_YEARS]); /* adjust for 1900 base of rtc_time */ tm->tm_year += 100; tm->tm_wday = buf[DT_WEEKDAYS] & 7; buf[DT_SECS] &= 0x7F; tm->tm_sec = bcd2bin(buf[DT_SECS]); buf[DT_MINUTES] &= 0x7F; tm->tm_min = bcd2bin(buf[DT_MINUTES]); tm->tm_hour = bcd2bin(buf[DT_HOURS]); tm->tm_mday = bcd2bin(buf[DT_DAYS]); tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1; return 0; } static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct pcf85363 *pcf85363 = dev_get_drvdata(dev); unsigned char buf[DT_YEARS + 1]; int len = sizeof(buf); buf[DT_100THS] = 0; buf[DT_SECS] = bin2bcd(tm->tm_sec); buf[DT_MINUTES] = bin2bcd(tm->tm_min); buf[DT_HOURS] = bin2bcd(tm->tm_hour); buf[DT_DAYS] = bin2bcd(tm->tm_mday); buf[DT_WEEKDAYS] = tm->tm_wday; buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1); buf[DT_YEARS] = bin2bcd(tm->tm_year % 100); return regmap_bulk_write(pcf85363->regmap, DT_100THS, buf, len); } static const struct rtc_class_ops rtc_ops = { .read_time = pcf85363_rtc_read_time, .set_time = pcf85363_rtc_set_time, }; static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val, size_t bytes) { struct pcf85363 *pcf85363 = priv; return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset, val, bytes); } static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val, size_t bytes) { struct pcf85363 *pcf85363 = priv; return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset, val, bytes); } static const struct regmap_config regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 0x7f, }; static int pcf85363_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct pcf85363 *pcf85363; struct nvmem_config nvmem_cfg = { .name = "pcf85363-", .word_size = 1, .stride = 1, .size = NVRAM_SIZE, .reg_read = pcf85363_nvram_read, .reg_write = pcf85363_nvram_write, }; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363), GFP_KERNEL); if (!pcf85363) return -ENOMEM; pcf85363->regmap = devm_regmap_init_i2c(client, ®map_config); if (IS_ERR(pcf85363->regmap)) { dev_err(&client->dev, "regmap allocation failed\n"); return PTR_ERR(pcf85363->regmap); } pcf85363->dev = &client->dev; i2c_set_clientdata(client, pcf85363); pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev); if (IS_ERR(pcf85363->rtc)) return PTR_ERR(pcf85363->rtc); pcf85363->rtc->ops = &rtc_ops; ret = rtc_register_device(pcf85363->rtc); nvmem_cfg.priv = pcf85363; rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg); return ret; } static const struct of_device_id dev_ids[] = { { .compatible = "nxp,pcf85363" }, {} }; MODULE_DEVICE_TABLE(of, dev_ids); static struct i2c_driver pcf85363_driver = { .driver = { .name = "pcf85363", .of_match_table = of_match_ptr(dev_ids), }, .probe = pcf85363_probe, }; module_i2c_driver(pcf85363_driver); MODULE_AUTHOR("Eric Nelson"); MODULE_DESCRIPTION("pcf85363 I2C RTC driver"); MODULE_LICENSE("GPL");