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