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/*
* Real Time Clock driver for Freescale MC13783 PMIC
*
* (C) 2009 Sascha Hauer, Pengutronix
*
* 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.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/mfd/mc13783-private.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtc.h>
struct mc13783_rtc {
struct rtc_device *rtc;
struct mc13783 *mc13783;
};
static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct mc13783_rtc *priv = dev_get_drvdata(dev);
unsigned int seconds, days;
seconds = secs % 86400;
days = secs / 86400;
mc13783_reg_write(priv->mc13783, MC13783_REG_RTC_TIME, seconds);
mc13783_reg_write(priv->mc13783, MC13783_REG_RTC_DAY, days);
return 0;
}
static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct mc13783_rtc *priv = dev_get_drvdata(dev);
unsigned int seconds, days1, days2;
unsigned long s1970;
rtc_tm_to_time(tm, &s1970);
do {
mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_TIME, &seconds);
mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_DAY, &days1);
mc13783_reg_read(priv->mc13783, MC13783_REG_RTC_DAY, &days2);
} while (days1 != days2);
s1970 = days1 * 86400 + seconds;
rtc_time_to_tm(s1970, tm);
return rtc_valid_tm(tm);
}
static const struct rtc_class_ops mc13783_rtc_ops = {
.read_time = mc13783_rtc_read_time,
.set_mmss = mc13783_rtc_set_mmss,
};
static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
{
int err;
struct mc13783_rtc *priv;
priv = kzalloc(sizeof *priv, GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, priv);
priv->rtc = rtc_device_register(pdev->name,
&pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc)) {
err = PTR_ERR(priv->rtc);
goto exit_kfree;
}
return 0;
exit_kfree:
kfree(priv);
return err;
}
static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
{
struct mc13783_rtc *priv = platform_get_drvdata(pdev);
rtc_device_unregister(priv->rtc);
platform_set_drvdata(pdev, NULL);
kfree(priv);
return 0;
}
static struct platform_driver mc13783_rtc_driver = {
.remove = __devexit_p(mc13783_rtc_remove),
.driver = {
.name = "mc13783-rtc",
.owner = THIS_MODULE,
},
};
static int __init mc13783_rtc_init(void)
{
return platform_driver_probe(&mc13783_rtc_driver, &mc13783_rtc_probe);
}
module_init(mc13783_rtc_init);
static void __exit mc13783_rtc_exit(void)
{
platform_driver_unregister(&mc13783_rtc_driver);
}
module_exit(mc13783_rtc_exit);
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mc13783-rtc");
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