283 lines
6.5 KiB
C
283 lines
6.5 KiB
C
/*
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* Real time clock driver for DA9052
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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#define rtc_err(da9052, fmt, ...) \
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dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
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struct da9052_rtc {
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struct rtc_device *rtc;
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struct da9052 *da9052;
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int irq;
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};
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static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable)
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{
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int ret;
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if (enable) {
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ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
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DA9052_ALARM_Y_ALARM_ON,
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DA9052_ALARM_Y_ALARM_ON);
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if (ret != 0)
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rtc_err(da9052, "Failed to enable ALM: %d\n", ret);
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} else {
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ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
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DA9052_ALARM_Y_ALARM_ON, 0);
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if (ret != 0)
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rtc_err(da9052, "Write error: %d\n", ret);
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}
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return ret;
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}
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static irqreturn_t da9052_rtc_irq(int irq, void *data)
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{
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struct da9052_rtc *rtc = data;
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int ret;
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ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG);
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if (ret < 0) {
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rtc_err(rtc->da9052, "Read error: %d\n", ret);
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return IRQ_NONE;
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}
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if (ret & DA9052_ALARMMI_ALARMTYPE) {
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da9052_rtc_enable_alarm(rtc->da9052, 0);
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
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} else
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_PF);
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return IRQ_HANDLED;
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}
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static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
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{
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int ret;
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uint8_t v[5];
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ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v);
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if (ret != 0) {
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rtc_err(da9052, "Failed to group read ALM: %d\n", ret);
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return ret;
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}
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rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
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rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1;
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rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
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rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
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rtc_tm->tm_min = v[0] & DA9052_RTC_MIN;
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ret = rtc_valid_tm(rtc_tm);
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if (ret != 0)
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return ret;
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return ret;
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}
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static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)
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{
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int ret;
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uint8_t v[3];
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rtc_tm->tm_year -= 100;
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rtc_tm->tm_mon += 1;
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ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
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DA9052_RTC_MIN, rtc_tm->tm_min);
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if (ret != 0) {
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rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret);
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return ret;
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}
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v[0] = rtc_tm->tm_hour;
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v[1] = rtc_tm->tm_mday;
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v[2] = rtc_tm->tm_mon;
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ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
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if (ret < 0)
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return ret;
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ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
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DA9052_RTC_YEAR, rtc_tm->tm_year);
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if (ret != 0)
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rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret);
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return ret;
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}
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static int da9052_rtc_get_alarm_status(struct da9052 *da9052)
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{
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int ret;
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ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG);
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if (ret < 0) {
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rtc_err(da9052, "Failed to read ALM: %d\n", ret);
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return ret;
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}
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ret &= DA9052_ALARM_Y_ALARM_ON;
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return (ret > 0) ? 1 : 0;
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}
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static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct da9052_rtc *rtc = dev_get_drvdata(dev);
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uint8_t v[6];
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int ret;
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ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
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if (ret < 0) {
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rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret);
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return ret;
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}
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rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;
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rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1;
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rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;
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rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;
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rtc_tm->tm_min = v[1] & DA9052_RTC_MIN;
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rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC;
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ret = rtc_valid_tm(rtc_tm);
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if (ret != 0) {
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rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct da9052_rtc *rtc;
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uint8_t v[6];
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rtc = dev_get_drvdata(dev);
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v[0] = tm->tm_sec;
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v[1] = tm->tm_min;
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v[2] = tm->tm_hour;
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v[3] = tm->tm_mday;
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v[4] = tm->tm_mon + 1;
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v[5] = tm->tm_year - 100;
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return da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
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}
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static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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int ret;
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struct rtc_time *tm = &alrm->time;
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struct da9052_rtc *rtc = dev_get_drvdata(dev);
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ret = da9052_read_alarm(rtc->da9052, tm);
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if (ret)
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return ret;
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alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052);
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return 0;
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}
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static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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int ret;
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struct rtc_time *tm = &alrm->time;
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struct da9052_rtc *rtc = dev_get_drvdata(dev);
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ret = da9052_rtc_enable_alarm(rtc->da9052, 0);
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if (ret < 0)
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return ret;
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ret = da9052_set_alarm(rtc->da9052, tm);
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if (ret)
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return ret;
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ret = da9052_rtc_enable_alarm(rtc->da9052, 1);
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return ret;
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}
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static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct da9052_rtc *rtc = dev_get_drvdata(dev);
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return da9052_rtc_enable_alarm(rtc->da9052, enabled);
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}
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static const struct rtc_class_ops da9052_rtc_ops = {
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.read_time = da9052_rtc_read_time,
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.set_time = da9052_rtc_set_time,
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.read_alarm = da9052_rtc_read_alarm,
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.set_alarm = da9052_rtc_set_alarm,
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.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
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};
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static int da9052_rtc_probe(struct platform_device *pdev)
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{
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struct da9052_rtc *rtc;
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int ret;
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rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
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platform_set_drvdata(pdev, rtc);
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rtc->irq = DA9052_IRQ_ALARM;
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ret = da9052_request_irq(rtc->da9052, rtc->irq, "ALM",
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da9052_rtc_irq, rtc);
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if (ret != 0) {
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rtc_err(rtc->da9052, "irq registration failed: %d\n", ret);
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return ret;
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}
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rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&da9052_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc->rtc))
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return PTR_ERR(rtc->rtc);
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return 0;
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}
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static int da9052_rtc_remove(struct platform_device *pdev)
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{
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struct da9052_rtc *rtc = pdev->dev.platform_data;
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rtc_device_unregister(rtc->rtc);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver da9052_rtc_driver = {
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.probe = da9052_rtc_probe,
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.remove = da9052_rtc_remove,
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.driver = {
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.name = "da9052-rtc",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(da9052_rtc_driver);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9052-rtc");
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