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