/* rtc-da9063.c - Real time clock device driver for DA9063 * Copyright (C) 2013-14 Dialog Semiconductor Ltd. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/rtc.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/regmap.h> #include <linux/mfd/da9063/registers.h> #include <linux/mfd/da9063/core.h> #define YEARS_TO_DA9063(year) ((year) - 100) #define MONTHS_TO_DA9063(month) ((month) + 1) #define YEARS_FROM_DA9063(year) ((year) + 100) #define MONTHS_FROM_DA9063(month) ((month) - 1) #define RTC_ALARM_DATA_LEN (DA9063_AD_REG_ALARM_Y - DA9063_AD_REG_ALARM_MI + 1) #define RTC_DATA_LEN (DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1) #define RTC_SEC 0 #define RTC_MIN 1 #define RTC_HOUR 2 #define RTC_DAY 3 #define RTC_MONTH 4 #define RTC_YEAR 5 struct da9063_rtc { struct rtc_device *rtc_dev; struct da9063 *hw; struct rtc_time alarm_time; bool rtc_sync; int alarm_year; int alarm_start; int alarm_len; int data_start; }; static void da9063_data_to_tm(u8 *data, struct rtc_time *tm) { tm->tm_sec = data[RTC_SEC] & DA9063_COUNT_SEC_MASK; tm->tm_min = data[RTC_MIN] & DA9063_COUNT_MIN_MASK; tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK; tm->tm_mday = data[RTC_DAY] & DA9063_COUNT_DAY_MASK; tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] & DA9063_COUNT_MONTH_MASK); tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] & DA9063_COUNT_YEAR_MASK); } static void da9063_tm_to_data(struct rtc_time *tm, u8 *data) { data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK; data[RTC_SEC] |= tm->tm_sec & DA9063_COUNT_SEC_MASK; data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK; data[RTC_MIN] |= tm->tm_min & DA9063_COUNT_MIN_MASK; data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK; data[RTC_HOUR] |= tm->tm_hour & DA9063_COUNT_HOUR_MASK; data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK; data[RTC_DAY] |= tm->tm_mday & DA9063_COUNT_DAY_MASK; data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK; data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) & DA9063_COUNT_MONTH_MASK; data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK; data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) & DA9063_COUNT_YEAR_MASK; } static int da9063_rtc_stop_alarm(struct device *dev) { struct da9063_rtc *rtc = dev_get_drvdata(dev); return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, DA9063_ALARM_ON, 0); } static int da9063_rtc_start_alarm(struct device *dev) { struct da9063_rtc *rtc = dev_get_drvdata(dev); return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, DA9063_ALARM_ON, DA9063_ALARM_ON); } static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct da9063_rtc *rtc = dev_get_drvdata(dev); unsigned long tm_secs; unsigned long al_secs; u8 data[RTC_DATA_LEN]; int ret; ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S, data, RTC_DATA_LEN); if (ret < 0) { dev_err(dev, "Failed to read RTC time data: %d\n", ret); return ret; } if (!(data[RTC_SEC] & DA9063_RTC_READ)) { dev_dbg(dev, "RTC not yet ready to be read by the host\n"); return -EINVAL; } da9063_data_to_tm(data, tm); rtc_tm_to_time(tm, &tm_secs); rtc_tm_to_time(&rtc->alarm_time, &al_secs); /* handle the rtc synchronisation delay */ if (rtc->rtc_sync == true && al_secs - tm_secs == 1) memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time)); else rtc->rtc_sync = false; return rtc_valid_tm(tm); } static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct da9063_rtc *rtc = dev_get_drvdata(dev); u8 data[RTC_DATA_LEN]; int ret; da9063_tm_to_data(tm, data); ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S, data, RTC_DATA_LEN); if (ret < 0) dev_err(dev, "Failed to set RTC time data: %d\n", ret); return ret; } static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct da9063_rtc *rtc = dev_get_drvdata(dev); u8 data[RTC_DATA_LEN]; int ret; unsigned int val; data[RTC_SEC] = 0; ret = regmap_bulk_read(rtc->hw->regmap, rtc->alarm_start, &data[rtc->data_start], rtc->alarm_len); if (ret < 0) return ret; da9063_data_to_tm(data, &alrm->time); alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON); ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val); if (ret < 0) return ret; if (val & (DA9063_E_ALARM)) alrm->pending = 1; else alrm->pending = 0; return 0; } static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct da9063_rtc *rtc = dev_get_drvdata(dev); u8 data[RTC_DATA_LEN]; int ret; da9063_tm_to_data(&alrm->time, data); ret = da9063_rtc_stop_alarm(dev); if (ret < 0) { dev_err(dev, "Failed to stop alarm: %d\n", ret); return ret; } ret = regmap_bulk_write(rtc->hw->regmap, rtc->alarm_start, &data[rtc->data_start], rtc->alarm_len); if (ret < 0) { dev_err(dev, "Failed to write alarm: %d\n", ret); return ret; } da9063_data_to_tm(data, &rtc->alarm_time); if (alrm->enabled) { ret = da9063_rtc_start_alarm(dev); if (ret < 0) { dev_err(dev, "Failed to start alarm: %d\n", ret); return ret; } } return ret; } static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { if (enabled) return da9063_rtc_start_alarm(dev); else return da9063_rtc_stop_alarm(dev); } static irqreturn_t da9063_alarm_event(int irq, void *data) { struct da9063_rtc *rtc = data; regmap_update_bits(rtc->hw->regmap, rtc->alarm_year, DA9063_ALARM_ON, 0); rtc->rtc_sync = true; rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; } static const struct rtc_class_ops da9063_rtc_ops = { .read_time = da9063_rtc_read_time, .set_time = da9063_rtc_set_time, .read_alarm = da9063_rtc_read_alarm, .set_alarm = da9063_rtc_set_alarm, .alarm_irq_enable = da9063_rtc_alarm_irq_enable, }; static int da9063_rtc_probe(struct platform_device *pdev) { struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent); struct da9063_rtc *rtc; int irq_alarm; u8 data[RTC_DATA_LEN]; int ret; ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E, DA9063_RTC_EN, DA9063_RTC_EN); if (ret < 0) { dev_err(&pdev->dev, "Failed to enable RTC\n"); goto err; } ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K, DA9063_CRYSTAL, DA9063_CRYSTAL); if (ret < 0) { dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n"); goto err; } rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); if (!rtc) return -ENOMEM; if (da9063->variant_code == PMIC_DA9063_AD) { rtc->alarm_year = DA9063_AD_REG_ALARM_Y; rtc->alarm_start = DA9063_AD_REG_ALARM_MI; rtc->alarm_len = RTC_ALARM_DATA_LEN; rtc->data_start = RTC_MIN; } else { rtc->alarm_year = DA9063_BB_REG_ALARM_Y; rtc->alarm_start = DA9063_BB_REG_ALARM_S; rtc->alarm_len = RTC_DATA_LEN; rtc->data_start = RTC_SEC; } ret = regmap_update_bits(da9063->regmap, rtc->alarm_start, DA9063_ALARM_STATUS_TICK | DA9063_ALARM_STATUS_ALARM, 0); if (ret < 0) { dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); goto err; } ret = regmap_update_bits(da9063->regmap, rtc->alarm_start, DA9063_ALARM_STATUS_ALARM, DA9063_ALARM_STATUS_ALARM); if (ret < 0) { dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); goto err; } ret = regmap_update_bits(da9063->regmap, rtc->alarm_year, DA9063_TICK_ON, 0); if (ret < 0) { dev_err(&pdev->dev, "Failed to disable TICKs\n"); goto err; } data[RTC_SEC] = 0; ret = regmap_bulk_read(da9063->regmap, rtc->alarm_start, &data[rtc->data_start], rtc->alarm_len); if (ret < 0) { dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n", ret); goto err; } platform_set_drvdata(pdev, rtc); irq_alarm = platform_get_irq_byname(pdev, "ALARM"); ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL, da9063_alarm_event, IRQF_TRIGGER_LOW | IRQF_ONESHOT, "ALARM", rtc); if (ret) { dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n", irq_alarm, ret); goto err; } rtc->hw = da9063; rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC, &da9063_rtc_ops, THIS_MODULE); if (IS_ERR(rtc->rtc_dev)) return PTR_ERR(rtc->rtc_dev); da9063_data_to_tm(data, &rtc->alarm_time); rtc->rtc_sync = false; err: return ret; } static struct platform_driver da9063_rtc_driver = { .probe = da9063_rtc_probe, .driver = { .name = DA9063_DRVNAME_RTC, .owner = THIS_MODULE, }, }; module_platform_driver(da9063_rtc_driver); MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);